1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated.
| 1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated.
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42 if (D->getAttr<DeprecatedAttr>(Context)) {
| 42 if (D->getAttr()) {
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43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn.
| 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn.
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51 isSilenced = ND->getAttr<DeprecatedAttr>(Context);
| 51 isSilenced = ND->getAttr();
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52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60
| 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60
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61 MD = Impl->getClassInterface()->getMethod(Context, 62 MD->getSelector(),
| 61 MD = Impl->getClassInterface()->getMethod(MD->getSelector(),
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63 MD->isInstanceMethod());
| 62 MD->isInstanceMethod());
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64 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(Context);
| 63 isSilenced |= MD && MD->getAttr();
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65 } 66 } 67 } 68 69 if (!isSilenced) 70 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 71 } 72 73 // See if this is a deleted function. 74 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 75 if (FD->isDeleted()) { 76 Diag(Loc, diag::err_deleted_function_use); 77 Diag(D->getLocation(), diag::note_unavailable_here) << true; 78 return true; 79 } 80 } 81 82 // See if the decl is unavailable
| 64 } 65 } 66 } 67 68 if (!isSilenced) 69 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 70 } 71 72 // See if this is a deleted function. 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 if (FD->isDeleted()) { 75 Diag(Loc, diag::err_deleted_function_use); 76 Diag(D->getLocation(), diag::note_unavailable_here) << true; 77 return true; 78 } 79 } 80 81 // See if the decl is unavailable
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83 if (D->getAttr<UnavailableAttr>(Context)) {
| 82 if (D->getAttr()) {
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84 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 85 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 86 } 87 88 return false; 89} 90 91/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 92/// (and other functions in future), which have been declared with sentinel 93/// attribute. It warns if call does not have the sentinel argument. 94/// 95void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 96 Expr **Args, unsigned NumArgs) 97{
| 83 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 84 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 85 } 86 87 return false; 88} 89 90/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 91/// (and other functions in future), which have been declared with sentinel 92/// attribute. It warns if call does not have the sentinel argument. 93/// 94void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 95 Expr **Args, unsigned NumArgs) 96{
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98 const SentinelAttr *attr = D->getAttr<SentinelAttr>(Context);
| 97 const SentinelAttr *attr = D->getAttr();
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99 if (!attr) 100 return; 101 int sentinelPos = attr->getSentinel(); 102 int nullPos = attr->getNullPos(); 103 104 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 105 // base class. Then we won't be needing two versions of the same code. 106 unsigned int i = 0; 107 bool warnNotEnoughArgs = false; 108 int isMethod = 0; 109 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 110 // skip over named parameters. 111 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 112 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 113 if (nullPos) 114 --nullPos; 115 else 116 ++i; 117 } 118 warnNotEnoughArgs = (P != E || i >= NumArgs); 119 isMethod = 1; 120 } 121 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 122 // skip over named parameters. 123 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 124 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 125 if (nullPos) 126 --nullPos; 127 else 128 ++i; 129 } 130 warnNotEnoughArgs = (P != E || i >= NumArgs); 131 } 132 else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 133 // block or function pointer call. 134 QualType Ty = V->getType(); 135 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 136 const FunctionType *FT = Ty->isFunctionPointerType() 137 ? Ty->getAsPointerType()->getPointeeType()->getAsFunctionType() 138 : Ty->getAsBlockPointerType()->getPointeeType()->getAsFunctionType(); 139 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 140 unsigned NumArgsInProto = Proto->getNumArgs(); 141 unsigned k; 142 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 143 if (nullPos) 144 --nullPos; 145 else 146 ++i; 147 } 148 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 149 } 150 if (Ty->isBlockPointerType()) 151 isMethod = 2; 152 } 153 else 154 return; 155 } 156 else 157 return; 158 159 if (warnNotEnoughArgs) { 160 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 161 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 162 return; 163 } 164 int sentinel = i; 165 while (sentinelPos > 0 && i < NumArgs-1) { 166 --sentinelPos; 167 ++i; 168 } 169 if (sentinelPos > 0) { 170 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 171 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 172 return; 173 } 174 while (i < NumArgs-1) { 175 ++i; 176 ++sentinel; 177 } 178 Expr *sentinelExpr = Args[sentinel]; 179 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 180 !sentinelExpr->isNullPointerConstant(Context))) { 181 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 182 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 183 } 184 return; 185} 186 187SourceRange Sema::getExprRange(ExprTy *E) const { 188 Expr *Ex = (Expr *)E; 189 return Ex? Ex->getSourceRange() : SourceRange(); 190} 191 192//===----------------------------------------------------------------------===// 193// Standard Promotions and Conversions 194//===----------------------------------------------------------------------===// 195 196/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 197void Sema::DefaultFunctionArrayConversion(Expr *&E) { 198 QualType Ty = E->getType(); 199 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 200 201 if (Ty->isFunctionType()) 202 ImpCastExprToType(E, Context.getPointerType(Ty)); 203 else if (Ty->isArrayType()) { 204 // In C90 mode, arrays only promote to pointers if the array expression is 205 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 206 // type 'array of type' is converted to an expression that has type 'pointer 207 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 208 // that has type 'array of type' ...". The relevant change is "an lvalue" 209 // (C90) to "an expression" (C99). 210 // 211 // C++ 4.2p1: 212 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 213 // T" can be converted to an rvalue of type "pointer to T". 214 // 215 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 216 E->isLvalue(Context) == Expr::LV_Valid) 217 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 218 } 219} 220 221/// \brief Whether this is a promotable bitfield reference according 222/// to C99 6.3.1.1p2, bullet 2. 223/// 224/// \returns the type this bit-field will promote to, or NULL if no 225/// promotion occurs. 226static QualType isPromotableBitField(Expr *E, ASTContext &Context) { 227 FieldDecl *Field = E->getBitField(); 228 if (!Field) 229 return QualType(); 230 231 const BuiltinType *BT = Field->getType()->getAsBuiltinType(); 232 if (!BT) 233 return QualType(); 234 235 if (BT->getKind() != BuiltinType::Bool && 236 BT->getKind() != BuiltinType::Int && 237 BT->getKind() != BuiltinType::UInt) 238 return QualType(); 239 240 llvm::APSInt BitWidthAP; 241 if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context)) 242 return QualType(); 243 244 uint64_t BitWidth = BitWidthAP.getZExtValue(); 245 uint64_t IntSize = Context.getTypeSize(Context.IntTy); 246 if (BitWidth < IntSize || 247 (Field->getType()->isSignedIntegerType() && BitWidth == IntSize)) 248 return Context.IntTy; 249 250 if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType()) 251 return Context.UnsignedIntTy; 252 253 return QualType(); 254} 255 256/// UsualUnaryConversions - Performs various conversions that are common to most 257/// operators (C99 6.3). The conversions of array and function types are 258/// sometimes surpressed. For example, the array->pointer conversion doesn't 259/// apply if the array is an argument to the sizeof or address (&) operators. 260/// In these instances, this routine should *not* be called. 261Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 262 QualType Ty = Expr->getType(); 263 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 264 265 // C99 6.3.1.1p2: 266 // 267 // The following may be used in an expression wherever an int or 268 // unsigned int may be used: 269 // - an object or expression with an integer type whose integer 270 // conversion rank is less than or equal to the rank of int 271 // and unsigned int. 272 // - A bit-field of type _Bool, int, signed int, or unsigned int. 273 // 274 // If an int can represent all values of the original type, the 275 // value is converted to an int; otherwise, it is converted to an 276 // unsigned int. These are called the integer promotions. All 277 // other types are unchanged by the integer promotions. 278 if (Ty->isPromotableIntegerType()) { 279 ImpCastExprToType(Expr, Context.IntTy); 280 return Expr; 281 } else { 282 QualType T = isPromotableBitField(Expr, Context); 283 if (!T.isNull()) { 284 ImpCastExprToType(Expr, T); 285 return Expr; 286 } 287 } 288 289 DefaultFunctionArrayConversion(Expr); 290 return Expr; 291} 292 293/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 294/// do not have a prototype. Arguments that have type float are promoted to 295/// double. All other argument types are converted by UsualUnaryConversions(). 296void Sema::DefaultArgumentPromotion(Expr *&Expr) { 297 QualType Ty = Expr->getType(); 298 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 299 300 // If this is a 'float' (CVR qualified or typedef) promote to double. 301 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 302 if (BT->getKind() == BuiltinType::Float) 303 return ImpCastExprToType(Expr, Context.DoubleTy); 304 305 UsualUnaryConversions(Expr); 306} 307 308/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 309/// will warn if the resulting type is not a POD type, and rejects ObjC 310/// interfaces passed by value. This returns true if the argument type is 311/// completely illegal. 312bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 313 DefaultArgumentPromotion(Expr); 314 315 if (Expr->getType()->isObjCInterfaceType()) { 316 Diag(Expr->getLocStart(), 317 diag::err_cannot_pass_objc_interface_to_vararg) 318 << Expr->getType() << CT; 319 return true; 320 } 321 322 if (!Expr->getType()->isPODType()) 323 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 324 << Expr->getType() << CT; 325 326 return false; 327} 328 329 330/// UsualArithmeticConversions - Performs various conversions that are common to 331/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 332/// routine returns the first non-arithmetic type found. The client is 333/// responsible for emitting appropriate error diagnostics. 334/// FIXME: verify the conversion rules for "complex int" are consistent with 335/// GCC. 336QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 337 bool isCompAssign) { 338 if (!isCompAssign) 339 UsualUnaryConversions(lhsExpr); 340 341 UsualUnaryConversions(rhsExpr); 342 343 // For conversion purposes, we ignore any qualifiers. 344 // For example, "const float" and "float" are equivalent. 345 QualType lhs = 346 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 347 QualType rhs = 348 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 349 350 // If both types are identical, no conversion is needed. 351 if (lhs == rhs) 352 return lhs; 353 354 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 355 // The caller can deal with this (e.g. pointer + int). 356 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 357 return lhs; 358 359 // Perform bitfield promotions. 360 QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context); 361 if (!LHSBitfieldPromoteTy.isNull()) 362 lhs = LHSBitfieldPromoteTy; 363 QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context); 364 if (!RHSBitfieldPromoteTy.isNull()) 365 rhs = RHSBitfieldPromoteTy; 366 367 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 368 if (!isCompAssign) 369 ImpCastExprToType(lhsExpr, destType); 370 ImpCastExprToType(rhsExpr, destType); 371 return destType; 372} 373 374QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 375 // Perform the usual unary conversions. We do this early so that 376 // integral promotions to "int" can allow us to exit early, in the 377 // lhs == rhs check. Also, for conversion purposes, we ignore any 378 // qualifiers. For example, "const float" and "float" are 379 // equivalent. 380 if (lhs->isPromotableIntegerType()) 381 lhs = Context.IntTy; 382 else 383 lhs = lhs.getUnqualifiedType(); 384 if (rhs->isPromotableIntegerType()) 385 rhs = Context.IntTy; 386 else 387 rhs = rhs.getUnqualifiedType(); 388 389 // If both types are identical, no conversion is needed. 390 if (lhs == rhs) 391 return lhs; 392 393 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 394 // The caller can deal with this (e.g. pointer + int). 395 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 396 return lhs; 397 398 // At this point, we have two different arithmetic types. 399 400 // Handle complex types first (C99 6.3.1.8p1). 401 if (lhs->isComplexType() || rhs->isComplexType()) { 402 // if we have an integer operand, the result is the complex type. 403 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 404 // convert the rhs to the lhs complex type. 405 return lhs; 406 } 407 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 408 // convert the lhs to the rhs complex type. 409 return rhs; 410 } 411 // This handles complex/complex, complex/float, or float/complex. 412 // When both operands are complex, the shorter operand is converted to the 413 // type of the longer, and that is the type of the result. This corresponds 414 // to what is done when combining two real floating-point operands. 415 // The fun begins when size promotion occur across type domains. 416 // From H&S 6.3.4: When one operand is complex and the other is a real 417 // floating-point type, the less precise type is converted, within it's 418 // real or complex domain, to the precision of the other type. For example, 419 // when combining a "long double" with a "double _Complex", the 420 // "double _Complex" is promoted to "long double _Complex". 421 int result = Context.getFloatingTypeOrder(lhs, rhs); 422 423 if (result > 0) { // The left side is bigger, convert rhs. 424 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 425 } else if (result < 0) { // The right side is bigger, convert lhs. 426 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 427 } 428 // At this point, lhs and rhs have the same rank/size. Now, make sure the 429 // domains match. This is a requirement for our implementation, C99 430 // does not require this promotion. 431 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 432 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 433 return rhs; 434 } else { // handle "_Complex double, double". 435 return lhs; 436 } 437 } 438 return lhs; // The domain/size match exactly. 439 } 440 // Now handle "real" floating types (i.e. float, double, long double). 441 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 442 // if we have an integer operand, the result is the real floating type. 443 if (rhs->isIntegerType()) { 444 // convert rhs to the lhs floating point type. 445 return lhs; 446 } 447 if (rhs->isComplexIntegerType()) { 448 // convert rhs to the complex floating point type. 449 return Context.getComplexType(lhs); 450 } 451 if (lhs->isIntegerType()) { 452 // convert lhs to the rhs floating point type. 453 return rhs; 454 } 455 if (lhs->isComplexIntegerType()) { 456 // convert lhs to the complex floating point type. 457 return Context.getComplexType(rhs); 458 } 459 // We have two real floating types, float/complex combos were handled above. 460 // Convert the smaller operand to the bigger result. 461 int result = Context.getFloatingTypeOrder(lhs, rhs); 462 if (result > 0) // convert the rhs 463 return lhs; 464 assert(result < 0 && "illegal float comparison"); 465 return rhs; // convert the lhs 466 } 467 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 468 // Handle GCC complex int extension. 469 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 470 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 471 472 if (lhsComplexInt && rhsComplexInt) { 473 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 474 rhsComplexInt->getElementType()) >= 0) 475 return lhs; // convert the rhs 476 return rhs; 477 } else if (lhsComplexInt && rhs->isIntegerType()) { 478 // convert the rhs to the lhs complex type. 479 return lhs; 480 } else if (rhsComplexInt && lhs->isIntegerType()) { 481 // convert the lhs to the rhs complex type. 482 return rhs; 483 } 484 } 485 // Finally, we have two differing integer types. 486 // The rules for this case are in C99 6.3.1.8 487 int compare = Context.getIntegerTypeOrder(lhs, rhs); 488 bool lhsSigned = lhs->isSignedIntegerType(), 489 rhsSigned = rhs->isSignedIntegerType(); 490 QualType destType; 491 if (lhsSigned == rhsSigned) { 492 // Same signedness; use the higher-ranked type 493 destType = compare >= 0 ? lhs : rhs; 494 } else if (compare != (lhsSigned ? 1 : -1)) { 495 // The unsigned type has greater than or equal rank to the 496 // signed type, so use the unsigned type 497 destType = lhsSigned ? rhs : lhs; 498 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 499 // The two types are different widths; if we are here, that 500 // means the signed type is larger than the unsigned type, so 501 // use the signed type. 502 destType = lhsSigned ? lhs : rhs; 503 } else { 504 // The signed type is higher-ranked than the unsigned type, 505 // but isn't actually any bigger (like unsigned int and long 506 // on most 32-bit systems). Use the unsigned type corresponding 507 // to the signed type. 508 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 509 } 510 return destType; 511} 512 513//===----------------------------------------------------------------------===// 514// Semantic Analysis for various Expression Types 515//===----------------------------------------------------------------------===// 516 517 518/// ActOnStringLiteral - The specified tokens were lexed as pasted string 519/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 520/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 521/// multiple tokens. However, the common case is that StringToks points to one 522/// string. 523/// 524Action::OwningExprResult 525Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 526 assert(NumStringToks && "Must have at least one string!"); 527 528 StringLiteralParser Literal(StringToks, NumStringToks, PP); 529 if (Literal.hadError) 530 return ExprError(); 531 532 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 533 for (unsigned i = 0; i != NumStringToks; ++i) 534 StringTokLocs.push_back(StringToks[i].getLocation()); 535 536 QualType StrTy = Context.CharTy; 537 if (Literal.AnyWide) StrTy = Context.getWCharType(); 538 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 539 540 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 541 if (getLangOptions().CPlusPlus) 542 StrTy.addConst(); 543 544 // Get an array type for the string, according to C99 6.4.5. This includes 545 // the nul terminator character as well as the string length for pascal 546 // strings. 547 StrTy = Context.getConstantArrayType(StrTy, 548 llvm::APInt(32, Literal.GetNumStringChars()+1), 549 ArrayType::Normal, 0); 550 551 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 552 return Owned(StringLiteral::Create(Context, Literal.GetString(), 553 Literal.GetStringLength(), 554 Literal.AnyWide, StrTy, 555 &StringTokLocs[0], 556 StringTokLocs.size())); 557} 558 559/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 560/// CurBlock to VD should cause it to be snapshotted (as we do for auto 561/// variables defined outside the block) or false if this is not needed (e.g. 562/// for values inside the block or for globals). 563/// 564/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 565/// up-to-date. 566/// 567static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 568 ValueDecl *VD) { 569 // If the value is defined inside the block, we couldn't snapshot it even if 570 // we wanted to. 571 if (CurBlock->TheDecl == VD->getDeclContext()) 572 return false; 573 574 // If this is an enum constant or function, it is constant, don't snapshot. 575 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 576 return false; 577 578 // If this is a reference to an extern, static, or global variable, no need to 579 // snapshot it. 580 // FIXME: What about 'const' variables in C++? 581 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 582 if (!Var->hasLocalStorage()) 583 return false; 584 585 // Blocks that have these can't be constant. 586 CurBlock->hasBlockDeclRefExprs = true; 587 588 // If we have nested blocks, the decl may be declared in an outer block (in 589 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 590 // be defined outside all of the current blocks (in which case the blocks do 591 // all get the bit). Walk the nesting chain. 592 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 593 NextBlock = NextBlock->PrevBlockInfo) { 594 // If we found the defining block for the variable, don't mark the block as 595 // having a reference outside it. 596 if (NextBlock->TheDecl == VD->getDeclContext()) 597 break; 598 599 // Otherwise, the DeclRef from the inner block causes the outer one to need 600 // a snapshot as well. 601 NextBlock->hasBlockDeclRefExprs = true; 602 } 603 604 return true; 605} 606 607 608 609/// ActOnIdentifierExpr - The parser read an identifier in expression context, 610/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 611/// identifier is used in a function call context. 612/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 613/// class or namespace that the identifier must be a member of. 614Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 615 IdentifierInfo &II, 616 bool HasTrailingLParen, 617 const CXXScopeSpec *SS, 618 bool isAddressOfOperand) { 619 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 620 isAddressOfOperand); 621} 622 623/// BuildDeclRefExpr - Build either a DeclRefExpr or a 624/// QualifiedDeclRefExpr based on whether or not SS is a 625/// nested-name-specifier. 626Sema::OwningExprResult 627Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 628 bool TypeDependent, bool ValueDependent, 629 const CXXScopeSpec *SS) { 630 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 631 Diag(Loc, 632 diag::err_auto_variable_cannot_appear_in_own_initializer) 633 << D->getDeclName(); 634 return ExprError(); 635 } 636 637 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 638 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 639 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 640 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 641 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 642 << D->getIdentifier() << FD->getDeclName(); 643 Diag(D->getLocation(), diag::note_local_variable_declared_here) 644 << D->getIdentifier(); 645 return ExprError(); 646 } 647 } 648 } 649 } 650 651 MarkDeclarationReferenced(Loc, D); 652 653 Expr *E; 654 if (SS && !SS->isEmpty()) { 655 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 656 ValueDependent, SS->getRange(), 657 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 658 } else 659 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 660 661 return Owned(E); 662} 663 664/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 665/// variable corresponding to the anonymous union or struct whose type 666/// is Record. 667static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 668 RecordDecl *Record) { 669 assert(Record->isAnonymousStructOrUnion() && 670 "Record must be an anonymous struct or union!"); 671 672 // FIXME: Once Decls are directly linked together, this will be an O(1) 673 // operation rather than a slow walk through DeclContext's vector (which 674 // itself will be eliminated). DeclGroups might make this even better. 675 DeclContext *Ctx = Record->getDeclContext();
| 98 if (!attr) 99 return; 100 int sentinelPos = attr->getSentinel(); 101 int nullPos = attr->getNullPos(); 102 103 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 104 // base class. Then we won't be needing two versions of the same code. 105 unsigned int i = 0; 106 bool warnNotEnoughArgs = false; 107 int isMethod = 0; 108 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 109 // skip over named parameters. 110 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 111 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 112 if (nullPos) 113 --nullPos; 114 else 115 ++i; 116 } 117 warnNotEnoughArgs = (P != E || i >= NumArgs); 118 isMethod = 1; 119 } 120 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 121 // skip over named parameters. 122 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 123 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 124 if (nullPos) 125 --nullPos; 126 else 127 ++i; 128 } 129 warnNotEnoughArgs = (P != E || i >= NumArgs); 130 } 131 else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 132 // block or function pointer call. 133 QualType Ty = V->getType(); 134 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 135 const FunctionType *FT = Ty->isFunctionPointerType() 136 ? Ty->getAsPointerType()->getPointeeType()->getAsFunctionType() 137 : Ty->getAsBlockPointerType()->getPointeeType()->getAsFunctionType(); 138 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 139 unsigned NumArgsInProto = Proto->getNumArgs(); 140 unsigned k; 141 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 142 if (nullPos) 143 --nullPos; 144 else 145 ++i; 146 } 147 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 148 } 149 if (Ty->isBlockPointerType()) 150 isMethod = 2; 151 } 152 else 153 return; 154 } 155 else 156 return; 157 158 if (warnNotEnoughArgs) { 159 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 160 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 161 return; 162 } 163 int sentinel = i; 164 while (sentinelPos > 0 && i < NumArgs-1) { 165 --sentinelPos; 166 ++i; 167 } 168 if (sentinelPos > 0) { 169 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 170 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 171 return; 172 } 173 while (i < NumArgs-1) { 174 ++i; 175 ++sentinel; 176 } 177 Expr *sentinelExpr = Args[sentinel]; 178 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 179 !sentinelExpr->isNullPointerConstant(Context))) { 180 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 181 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 182 } 183 return; 184} 185 186SourceRange Sema::getExprRange(ExprTy *E) const { 187 Expr *Ex = (Expr *)E; 188 return Ex? Ex->getSourceRange() : SourceRange(); 189} 190 191//===----------------------------------------------------------------------===// 192// Standard Promotions and Conversions 193//===----------------------------------------------------------------------===// 194 195/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 196void Sema::DefaultFunctionArrayConversion(Expr *&E) { 197 QualType Ty = E->getType(); 198 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 199 200 if (Ty->isFunctionType()) 201 ImpCastExprToType(E, Context.getPointerType(Ty)); 202 else if (Ty->isArrayType()) { 203 // In C90 mode, arrays only promote to pointers if the array expression is 204 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 205 // type 'array of type' is converted to an expression that has type 'pointer 206 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 207 // that has type 'array of type' ...". The relevant change is "an lvalue" 208 // (C90) to "an expression" (C99). 209 // 210 // C++ 4.2p1: 211 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 212 // T" can be converted to an rvalue of type "pointer to T". 213 // 214 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 215 E->isLvalue(Context) == Expr::LV_Valid) 216 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 217 } 218} 219 220/// \brief Whether this is a promotable bitfield reference according 221/// to C99 6.3.1.1p2, bullet 2. 222/// 223/// \returns the type this bit-field will promote to, or NULL if no 224/// promotion occurs. 225static QualType isPromotableBitField(Expr *E, ASTContext &Context) { 226 FieldDecl *Field = E->getBitField(); 227 if (!Field) 228 return QualType(); 229 230 const BuiltinType *BT = Field->getType()->getAsBuiltinType(); 231 if (!BT) 232 return QualType(); 233 234 if (BT->getKind() != BuiltinType::Bool && 235 BT->getKind() != BuiltinType::Int && 236 BT->getKind() != BuiltinType::UInt) 237 return QualType(); 238 239 llvm::APSInt BitWidthAP; 240 if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context)) 241 return QualType(); 242 243 uint64_t BitWidth = BitWidthAP.getZExtValue(); 244 uint64_t IntSize = Context.getTypeSize(Context.IntTy); 245 if (BitWidth < IntSize || 246 (Field->getType()->isSignedIntegerType() && BitWidth == IntSize)) 247 return Context.IntTy; 248 249 if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType()) 250 return Context.UnsignedIntTy; 251 252 return QualType(); 253} 254 255/// UsualUnaryConversions - Performs various conversions that are common to most 256/// operators (C99 6.3). The conversions of array and function types are 257/// sometimes surpressed. For example, the array->pointer conversion doesn't 258/// apply if the array is an argument to the sizeof or address (&) operators. 259/// In these instances, this routine should *not* be called. 260Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 261 QualType Ty = Expr->getType(); 262 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 263 264 // C99 6.3.1.1p2: 265 // 266 // The following may be used in an expression wherever an int or 267 // unsigned int may be used: 268 // - an object or expression with an integer type whose integer 269 // conversion rank is less than or equal to the rank of int 270 // and unsigned int. 271 // - A bit-field of type _Bool, int, signed int, or unsigned int. 272 // 273 // If an int can represent all values of the original type, the 274 // value is converted to an int; otherwise, it is converted to an 275 // unsigned int. These are called the integer promotions. All 276 // other types are unchanged by the integer promotions. 277 if (Ty->isPromotableIntegerType()) { 278 ImpCastExprToType(Expr, Context.IntTy); 279 return Expr; 280 } else { 281 QualType T = isPromotableBitField(Expr, Context); 282 if (!T.isNull()) { 283 ImpCastExprToType(Expr, T); 284 return Expr; 285 } 286 } 287 288 DefaultFunctionArrayConversion(Expr); 289 return Expr; 290} 291 292/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 293/// do not have a prototype. Arguments that have type float are promoted to 294/// double. All other argument types are converted by UsualUnaryConversions(). 295void Sema::DefaultArgumentPromotion(Expr *&Expr) { 296 QualType Ty = Expr->getType(); 297 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 298 299 // If this is a 'float' (CVR qualified or typedef) promote to double. 300 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 301 if (BT->getKind() == BuiltinType::Float) 302 return ImpCastExprToType(Expr, Context.DoubleTy); 303 304 UsualUnaryConversions(Expr); 305} 306 307/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 308/// will warn if the resulting type is not a POD type, and rejects ObjC 309/// interfaces passed by value. This returns true if the argument type is 310/// completely illegal. 311bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 312 DefaultArgumentPromotion(Expr); 313 314 if (Expr->getType()->isObjCInterfaceType()) { 315 Diag(Expr->getLocStart(), 316 diag::err_cannot_pass_objc_interface_to_vararg) 317 << Expr->getType() << CT; 318 return true; 319 } 320 321 if (!Expr->getType()->isPODType()) 322 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 323 << Expr->getType() << CT; 324 325 return false; 326} 327 328 329/// UsualArithmeticConversions - Performs various conversions that are common to 330/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 331/// routine returns the first non-arithmetic type found. The client is 332/// responsible for emitting appropriate error diagnostics. 333/// FIXME: verify the conversion rules for "complex int" are consistent with 334/// GCC. 335QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 336 bool isCompAssign) { 337 if (!isCompAssign) 338 UsualUnaryConversions(lhsExpr); 339 340 UsualUnaryConversions(rhsExpr); 341 342 // For conversion purposes, we ignore any qualifiers. 343 // For example, "const float" and "float" are equivalent. 344 QualType lhs = 345 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 346 QualType rhs = 347 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 348 349 // If both types are identical, no conversion is needed. 350 if (lhs == rhs) 351 return lhs; 352 353 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 354 // The caller can deal with this (e.g. pointer + int). 355 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 356 return lhs; 357 358 // Perform bitfield promotions. 359 QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context); 360 if (!LHSBitfieldPromoteTy.isNull()) 361 lhs = LHSBitfieldPromoteTy; 362 QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context); 363 if (!RHSBitfieldPromoteTy.isNull()) 364 rhs = RHSBitfieldPromoteTy; 365 366 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 367 if (!isCompAssign) 368 ImpCastExprToType(lhsExpr, destType); 369 ImpCastExprToType(rhsExpr, destType); 370 return destType; 371} 372 373QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 374 // Perform the usual unary conversions. We do this early so that 375 // integral promotions to "int" can allow us to exit early, in the 376 // lhs == rhs check. Also, for conversion purposes, we ignore any 377 // qualifiers. For example, "const float" and "float" are 378 // equivalent. 379 if (lhs->isPromotableIntegerType()) 380 lhs = Context.IntTy; 381 else 382 lhs = lhs.getUnqualifiedType(); 383 if (rhs->isPromotableIntegerType()) 384 rhs = Context.IntTy; 385 else 386 rhs = rhs.getUnqualifiedType(); 387 388 // If both types are identical, no conversion is needed. 389 if (lhs == rhs) 390 return lhs; 391 392 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 393 // The caller can deal with this (e.g. pointer + int). 394 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 395 return lhs; 396 397 // At this point, we have two different arithmetic types. 398 399 // Handle complex types first (C99 6.3.1.8p1). 400 if (lhs->isComplexType() || rhs->isComplexType()) { 401 // if we have an integer operand, the result is the complex type. 402 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 403 // convert the rhs to the lhs complex type. 404 return lhs; 405 } 406 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 407 // convert the lhs to the rhs complex type. 408 return rhs; 409 } 410 // This handles complex/complex, complex/float, or float/complex. 411 // When both operands are complex, the shorter operand is converted to the 412 // type of the longer, and that is the type of the result. This corresponds 413 // to what is done when combining two real floating-point operands. 414 // The fun begins when size promotion occur across type domains. 415 // From H&S 6.3.4: When one operand is complex and the other is a real 416 // floating-point type, the less precise type is converted, within it's 417 // real or complex domain, to the precision of the other type. For example, 418 // when combining a "long double" with a "double _Complex", the 419 // "double _Complex" is promoted to "long double _Complex". 420 int result = Context.getFloatingTypeOrder(lhs, rhs); 421 422 if (result > 0) { // The left side is bigger, convert rhs. 423 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 424 } else if (result < 0) { // The right side is bigger, convert lhs. 425 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 426 } 427 // At this point, lhs and rhs have the same rank/size. Now, make sure the 428 // domains match. This is a requirement for our implementation, C99 429 // does not require this promotion. 430 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 431 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 432 return rhs; 433 } else { // handle "_Complex double, double". 434 return lhs; 435 } 436 } 437 return lhs; // The domain/size match exactly. 438 } 439 // Now handle "real" floating types (i.e. float, double, long double). 440 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 441 // if we have an integer operand, the result is the real floating type. 442 if (rhs->isIntegerType()) { 443 // convert rhs to the lhs floating point type. 444 return lhs; 445 } 446 if (rhs->isComplexIntegerType()) { 447 // convert rhs to the complex floating point type. 448 return Context.getComplexType(lhs); 449 } 450 if (lhs->isIntegerType()) { 451 // convert lhs to the rhs floating point type. 452 return rhs; 453 } 454 if (lhs->isComplexIntegerType()) { 455 // convert lhs to the complex floating point type. 456 return Context.getComplexType(rhs); 457 } 458 // We have two real floating types, float/complex combos were handled above. 459 // Convert the smaller operand to the bigger result. 460 int result = Context.getFloatingTypeOrder(lhs, rhs); 461 if (result > 0) // convert the rhs 462 return lhs; 463 assert(result < 0 && "illegal float comparison"); 464 return rhs; // convert the lhs 465 } 466 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 467 // Handle GCC complex int extension. 468 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 469 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 470 471 if (lhsComplexInt && rhsComplexInt) { 472 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 473 rhsComplexInt->getElementType()) >= 0) 474 return lhs; // convert the rhs 475 return rhs; 476 } else if (lhsComplexInt && rhs->isIntegerType()) { 477 // convert the rhs to the lhs complex type. 478 return lhs; 479 } else if (rhsComplexInt && lhs->isIntegerType()) { 480 // convert the lhs to the rhs complex type. 481 return rhs; 482 } 483 } 484 // Finally, we have two differing integer types. 485 // The rules for this case are in C99 6.3.1.8 486 int compare = Context.getIntegerTypeOrder(lhs, rhs); 487 bool lhsSigned = lhs->isSignedIntegerType(), 488 rhsSigned = rhs->isSignedIntegerType(); 489 QualType destType; 490 if (lhsSigned == rhsSigned) { 491 // Same signedness; use the higher-ranked type 492 destType = compare >= 0 ? lhs : rhs; 493 } else if (compare != (lhsSigned ? 1 : -1)) { 494 // The unsigned type has greater than or equal rank to the 495 // signed type, so use the unsigned type 496 destType = lhsSigned ? rhs : lhs; 497 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 498 // The two types are different widths; if we are here, that 499 // means the signed type is larger than the unsigned type, so 500 // use the signed type. 501 destType = lhsSigned ? lhs : rhs; 502 } else { 503 // The signed type is higher-ranked than the unsigned type, 504 // but isn't actually any bigger (like unsigned int and long 505 // on most 32-bit systems). Use the unsigned type corresponding 506 // to the signed type. 507 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 508 } 509 return destType; 510} 511 512//===----------------------------------------------------------------------===// 513// Semantic Analysis for various Expression Types 514//===----------------------------------------------------------------------===// 515 516 517/// ActOnStringLiteral - The specified tokens were lexed as pasted string 518/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 519/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 520/// multiple tokens. However, the common case is that StringToks points to one 521/// string. 522/// 523Action::OwningExprResult 524Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 525 assert(NumStringToks && "Must have at least one string!"); 526 527 StringLiteralParser Literal(StringToks, NumStringToks, PP); 528 if (Literal.hadError) 529 return ExprError(); 530 531 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 532 for (unsigned i = 0; i != NumStringToks; ++i) 533 StringTokLocs.push_back(StringToks[i].getLocation()); 534 535 QualType StrTy = Context.CharTy; 536 if (Literal.AnyWide) StrTy = Context.getWCharType(); 537 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 538 539 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 540 if (getLangOptions().CPlusPlus) 541 StrTy.addConst(); 542 543 // Get an array type for the string, according to C99 6.4.5. This includes 544 // the nul terminator character as well as the string length for pascal 545 // strings. 546 StrTy = Context.getConstantArrayType(StrTy, 547 llvm::APInt(32, Literal.GetNumStringChars()+1), 548 ArrayType::Normal, 0); 549 550 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 551 return Owned(StringLiteral::Create(Context, Literal.GetString(), 552 Literal.GetStringLength(), 553 Literal.AnyWide, StrTy, 554 &StringTokLocs[0], 555 StringTokLocs.size())); 556} 557 558/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 559/// CurBlock to VD should cause it to be snapshotted (as we do for auto 560/// variables defined outside the block) or false if this is not needed (e.g. 561/// for values inside the block or for globals). 562/// 563/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 564/// up-to-date. 565/// 566static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 567 ValueDecl *VD) { 568 // If the value is defined inside the block, we couldn't snapshot it even if 569 // we wanted to. 570 if (CurBlock->TheDecl == VD->getDeclContext()) 571 return false; 572 573 // If this is an enum constant or function, it is constant, don't snapshot. 574 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 575 return false; 576 577 // If this is a reference to an extern, static, or global variable, no need to 578 // snapshot it. 579 // FIXME: What about 'const' variables in C++? 580 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 581 if (!Var->hasLocalStorage()) 582 return false; 583 584 // Blocks that have these can't be constant. 585 CurBlock->hasBlockDeclRefExprs = true; 586 587 // If we have nested blocks, the decl may be declared in an outer block (in 588 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 589 // be defined outside all of the current blocks (in which case the blocks do 590 // all get the bit). Walk the nesting chain. 591 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 592 NextBlock = NextBlock->PrevBlockInfo) { 593 // If we found the defining block for the variable, don't mark the block as 594 // having a reference outside it. 595 if (NextBlock->TheDecl == VD->getDeclContext()) 596 break; 597 598 // Otherwise, the DeclRef from the inner block causes the outer one to need 599 // a snapshot as well. 600 NextBlock->hasBlockDeclRefExprs = true; 601 } 602 603 return true; 604} 605 606 607 608/// ActOnIdentifierExpr - The parser read an identifier in expression context, 609/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 610/// identifier is used in a function call context. 611/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 612/// class or namespace that the identifier must be a member of. 613Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 614 IdentifierInfo &II, 615 bool HasTrailingLParen, 616 const CXXScopeSpec *SS, 617 bool isAddressOfOperand) { 618 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 619 isAddressOfOperand); 620} 621 622/// BuildDeclRefExpr - Build either a DeclRefExpr or a 623/// QualifiedDeclRefExpr based on whether or not SS is a 624/// nested-name-specifier. 625Sema::OwningExprResult 626Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 627 bool TypeDependent, bool ValueDependent, 628 const CXXScopeSpec *SS) { 629 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 630 Diag(Loc, 631 diag::err_auto_variable_cannot_appear_in_own_initializer) 632 << D->getDeclName(); 633 return ExprError(); 634 } 635 636 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 637 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 638 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 639 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 640 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 641 << D->getIdentifier() << FD->getDeclName(); 642 Diag(D->getLocation(), diag::note_local_variable_declared_here) 643 << D->getIdentifier(); 644 return ExprError(); 645 } 646 } 647 } 648 } 649 650 MarkDeclarationReferenced(Loc, D); 651 652 Expr *E; 653 if (SS && !SS->isEmpty()) { 654 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 655 ValueDependent, SS->getRange(), 656 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 657 } else 658 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 659 660 return Owned(E); 661} 662 663/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 664/// variable corresponding to the anonymous union or struct whose type 665/// is Record. 666static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 667 RecordDecl *Record) { 668 assert(Record->isAnonymousStructOrUnion() && 669 "Record must be an anonymous struct or union!"); 670 671 // FIXME: Once Decls are directly linked together, this will be an O(1) 672 // operation rather than a slow walk through DeclContext's vector (which 673 // itself will be eliminated). DeclGroups might make this even better. 674 DeclContext *Ctx = Record->getDeclContext();
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676 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 677 DEnd = Ctx->decls_end(Context);
| 675 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 676 DEnd = Ctx->decls_end();
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678 D != DEnd; ++D) { 679 if (*D == Record) { 680 // The object for the anonymous struct/union directly 681 // follows its type in the list of declarations. 682 ++D; 683 assert(D != DEnd && "Missing object for anonymous record"); 684 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 685 return *D; 686 } 687 } 688 689 assert(false && "Missing object for anonymous record"); 690 return 0; 691} 692 693/// \brief Given a field that represents a member of an anonymous 694/// struct/union, build the path from that field's context to the 695/// actual member. 696/// 697/// Construct the sequence of field member references we'll have to 698/// perform to get to the field in the anonymous union/struct. The 699/// list of members is built from the field outward, so traverse it 700/// backwards to go from an object in the current context to the field 701/// we found. 702/// 703/// \returns The variable from which the field access should begin, 704/// for an anonymous struct/union that is not a member of another 705/// class. Otherwise, returns NULL. 706VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 707 llvm::SmallVectorImpl<FieldDecl *> &Path) { 708 assert(Field->getDeclContext()->isRecord() && 709 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 710 && "Field must be stored inside an anonymous struct or union"); 711 712 Path.push_back(Field); 713 VarDecl *BaseObject = 0; 714 DeclContext *Ctx = Field->getDeclContext(); 715 do { 716 RecordDecl *Record = cast<RecordDecl>(Ctx); 717 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 718 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 719 Path.push_back(AnonField); 720 else { 721 BaseObject = cast<VarDecl>(AnonObject); 722 break; 723 } 724 Ctx = Ctx->getParent(); 725 } while (Ctx->isRecord() && 726 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 727 728 return BaseObject; 729} 730 731Sema::OwningExprResult 732Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 733 FieldDecl *Field, 734 Expr *BaseObjectExpr, 735 SourceLocation OpLoc) { 736 llvm::SmallVector<FieldDecl *, 4> AnonFields; 737 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 738 AnonFields); 739 740 // Build the expression that refers to the base object, from 741 // which we will build a sequence of member references to each 742 // of the anonymous union objects and, eventually, the field we 743 // found via name lookup. 744 bool BaseObjectIsPointer = false; 745 unsigned ExtraQuals = 0; 746 if (BaseObject) { 747 // BaseObject is an anonymous struct/union variable (and is, 748 // therefore, not part of another non-anonymous record). 749 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 750 MarkDeclarationReferenced(Loc, BaseObject); 751 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 752 SourceLocation()); 753 ExtraQuals 754 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 755 } else if (BaseObjectExpr) { 756 // The caller provided the base object expression. Determine 757 // whether its a pointer and whether it adds any qualifiers to the 758 // anonymous struct/union fields we're looking into. 759 QualType ObjectType = BaseObjectExpr->getType(); 760 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 761 BaseObjectIsPointer = true; 762 ObjectType = ObjectPtr->getPointeeType(); 763 } 764 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 765 } else { 766 // We've found a member of an anonymous struct/union that is 767 // inside a non-anonymous struct/union, so in a well-formed 768 // program our base object expression is "this". 769 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 770 if (!MD->isStatic()) { 771 QualType AnonFieldType 772 = Context.getTagDeclType( 773 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 774 QualType ThisType = Context.getTagDeclType(MD->getParent()); 775 if ((Context.getCanonicalType(AnonFieldType) 776 == Context.getCanonicalType(ThisType)) || 777 IsDerivedFrom(ThisType, AnonFieldType)) { 778 // Our base object expression is "this". 779 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 780 MD->getThisType(Context)); 781 BaseObjectIsPointer = true; 782 } 783 } else { 784 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 785 << Field->getDeclName()); 786 } 787 ExtraQuals = MD->getTypeQualifiers(); 788 } 789 790 if (!BaseObjectExpr) 791 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 792 << Field->getDeclName()); 793 } 794 795 // Build the implicit member references to the field of the 796 // anonymous struct/union. 797 Expr *Result = BaseObjectExpr; 798 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 799 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 800 FI != FIEnd; ++FI) { 801 QualType MemberType = (*FI)->getType(); 802 if (!(*FI)->isMutable()) { 803 unsigned combinedQualifiers 804 = MemberType.getCVRQualifiers() | ExtraQuals; 805 MemberType = MemberType.getQualifiedType(combinedQualifiers); 806 } 807 MarkDeclarationReferenced(Loc, *FI); 808 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 809 OpLoc, MemberType); 810 BaseObjectIsPointer = false; 811 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 812 } 813 814 return Owned(Result); 815} 816 817/// ActOnDeclarationNameExpr - The parser has read some kind of name 818/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 819/// performs lookup on that name and returns an expression that refers 820/// to that name. This routine isn't directly called from the parser, 821/// because the parser doesn't know about DeclarationName. Rather, 822/// this routine is called by ActOnIdentifierExpr, 823/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 824/// which form the DeclarationName from the corresponding syntactic 825/// forms. 826/// 827/// HasTrailingLParen indicates whether this identifier is used in a 828/// function call context. LookupCtx is only used for a C++ 829/// qualified-id (foo::bar) to indicate the class or namespace that 830/// the identifier must be a member of. 831/// 832/// isAddressOfOperand means that this expression is the direct operand 833/// of an address-of operator. This matters because this is the only 834/// situation where a qualified name referencing a non-static member may 835/// appear outside a member function of this class. 836Sema::OwningExprResult 837Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 838 DeclarationName Name, bool HasTrailingLParen, 839 const CXXScopeSpec *SS, 840 bool isAddressOfOperand) { 841 // Could be enum-constant, value decl, instance variable, etc. 842 if (SS && SS->isInvalid()) 843 return ExprError(); 844 845 // C++ [temp.dep.expr]p3: 846 // An id-expression is type-dependent if it contains: 847 // -- a nested-name-specifier that contains a class-name that 848 // names a dependent type. 849 // FIXME: Member of the current instantiation. 850 if (SS && isDependentScopeSpecifier(*SS)) { 851 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 852 Loc, SS->getRange(), 853 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 854 } 855 856 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 857 false, true, Loc); 858 859 if (Lookup.isAmbiguous()) { 860 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 861 SS && SS->isSet() ? SS->getRange() 862 : SourceRange()); 863 return ExprError(); 864 } 865 866 NamedDecl *D = Lookup.getAsDecl(); 867 868 // If this reference is in an Objective-C method, then ivar lookup happens as 869 // well. 870 IdentifierInfo *II = Name.getAsIdentifierInfo(); 871 if (II && getCurMethodDecl()) { 872 // There are two cases to handle here. 1) scoped lookup could have failed, 873 // in which case we should look for an ivar. 2) scoped lookup could have 874 // found a decl, but that decl is outside the current instance method (i.e. 875 // a global variable). In these two cases, we do a lookup for an ivar with 876 // this name, if the lookup sucedes, we replace it our current decl. 877 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 878 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 879 ObjCInterfaceDecl *ClassDeclared;
| 677 D != DEnd; ++D) { 678 if (*D == Record) { 679 // The object for the anonymous struct/union directly 680 // follows its type in the list of declarations. 681 ++D; 682 assert(D != DEnd && "Missing object for anonymous record"); 683 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 684 return *D; 685 } 686 } 687 688 assert(false && "Missing object for anonymous record"); 689 return 0; 690} 691 692/// \brief Given a field that represents a member of an anonymous 693/// struct/union, build the path from that field's context to the 694/// actual member. 695/// 696/// Construct the sequence of field member references we'll have to 697/// perform to get to the field in the anonymous union/struct. The 698/// list of members is built from the field outward, so traverse it 699/// backwards to go from an object in the current context to the field 700/// we found. 701/// 702/// \returns The variable from which the field access should begin, 703/// for an anonymous struct/union that is not a member of another 704/// class. Otherwise, returns NULL. 705VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 706 llvm::SmallVectorImpl<FieldDecl *> &Path) { 707 assert(Field->getDeclContext()->isRecord() && 708 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 709 && "Field must be stored inside an anonymous struct or union"); 710 711 Path.push_back(Field); 712 VarDecl *BaseObject = 0; 713 DeclContext *Ctx = Field->getDeclContext(); 714 do { 715 RecordDecl *Record = cast<RecordDecl>(Ctx); 716 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 717 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 718 Path.push_back(AnonField); 719 else { 720 BaseObject = cast<VarDecl>(AnonObject); 721 break; 722 } 723 Ctx = Ctx->getParent(); 724 } while (Ctx->isRecord() && 725 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 726 727 return BaseObject; 728} 729 730Sema::OwningExprResult 731Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 732 FieldDecl *Field, 733 Expr *BaseObjectExpr, 734 SourceLocation OpLoc) { 735 llvm::SmallVector<FieldDecl *, 4> AnonFields; 736 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 737 AnonFields); 738 739 // Build the expression that refers to the base object, from 740 // which we will build a sequence of member references to each 741 // of the anonymous union objects and, eventually, the field we 742 // found via name lookup. 743 bool BaseObjectIsPointer = false; 744 unsigned ExtraQuals = 0; 745 if (BaseObject) { 746 // BaseObject is an anonymous struct/union variable (and is, 747 // therefore, not part of another non-anonymous record). 748 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 749 MarkDeclarationReferenced(Loc, BaseObject); 750 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 751 SourceLocation()); 752 ExtraQuals 753 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 754 } else if (BaseObjectExpr) { 755 // The caller provided the base object expression. Determine 756 // whether its a pointer and whether it adds any qualifiers to the 757 // anonymous struct/union fields we're looking into. 758 QualType ObjectType = BaseObjectExpr->getType(); 759 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 760 BaseObjectIsPointer = true; 761 ObjectType = ObjectPtr->getPointeeType(); 762 } 763 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 764 } else { 765 // We've found a member of an anonymous struct/union that is 766 // inside a non-anonymous struct/union, so in a well-formed 767 // program our base object expression is "this". 768 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 769 if (!MD->isStatic()) { 770 QualType AnonFieldType 771 = Context.getTagDeclType( 772 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 773 QualType ThisType = Context.getTagDeclType(MD->getParent()); 774 if ((Context.getCanonicalType(AnonFieldType) 775 == Context.getCanonicalType(ThisType)) || 776 IsDerivedFrom(ThisType, AnonFieldType)) { 777 // Our base object expression is "this". 778 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 779 MD->getThisType(Context)); 780 BaseObjectIsPointer = true; 781 } 782 } else { 783 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 784 << Field->getDeclName()); 785 } 786 ExtraQuals = MD->getTypeQualifiers(); 787 } 788 789 if (!BaseObjectExpr) 790 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 791 << Field->getDeclName()); 792 } 793 794 // Build the implicit member references to the field of the 795 // anonymous struct/union. 796 Expr *Result = BaseObjectExpr; 797 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 798 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 799 FI != FIEnd; ++FI) { 800 QualType MemberType = (*FI)->getType(); 801 if (!(*FI)->isMutable()) { 802 unsigned combinedQualifiers 803 = MemberType.getCVRQualifiers() | ExtraQuals; 804 MemberType = MemberType.getQualifiedType(combinedQualifiers); 805 } 806 MarkDeclarationReferenced(Loc, *FI); 807 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 808 OpLoc, MemberType); 809 BaseObjectIsPointer = false; 810 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 811 } 812 813 return Owned(Result); 814} 815 816/// ActOnDeclarationNameExpr - The parser has read some kind of name 817/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 818/// performs lookup on that name and returns an expression that refers 819/// to that name. This routine isn't directly called from the parser, 820/// because the parser doesn't know about DeclarationName. Rather, 821/// this routine is called by ActOnIdentifierExpr, 822/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 823/// which form the DeclarationName from the corresponding syntactic 824/// forms. 825/// 826/// HasTrailingLParen indicates whether this identifier is used in a 827/// function call context. LookupCtx is only used for a C++ 828/// qualified-id (foo::bar) to indicate the class or namespace that 829/// the identifier must be a member of. 830/// 831/// isAddressOfOperand means that this expression is the direct operand 832/// of an address-of operator. This matters because this is the only 833/// situation where a qualified name referencing a non-static member may 834/// appear outside a member function of this class. 835Sema::OwningExprResult 836Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 837 DeclarationName Name, bool HasTrailingLParen, 838 const CXXScopeSpec *SS, 839 bool isAddressOfOperand) { 840 // Could be enum-constant, value decl, instance variable, etc. 841 if (SS && SS->isInvalid()) 842 return ExprError(); 843 844 // C++ [temp.dep.expr]p3: 845 // An id-expression is type-dependent if it contains: 846 // -- a nested-name-specifier that contains a class-name that 847 // names a dependent type. 848 // FIXME: Member of the current instantiation. 849 if (SS && isDependentScopeSpecifier(*SS)) { 850 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 851 Loc, SS->getRange(), 852 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 853 } 854 855 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 856 false, true, Loc); 857 858 if (Lookup.isAmbiguous()) { 859 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 860 SS && SS->isSet() ? SS->getRange() 861 : SourceRange()); 862 return ExprError(); 863 } 864 865 NamedDecl *D = Lookup.getAsDecl(); 866 867 // If this reference is in an Objective-C method, then ivar lookup happens as 868 // well. 869 IdentifierInfo *II = Name.getAsIdentifierInfo(); 870 if (II && getCurMethodDecl()) { 871 // There are two cases to handle here. 1) scoped lookup could have failed, 872 // in which case we should look for an ivar. 2) scoped lookup could have 873 // found a decl, but that decl is outside the current instance method (i.e. 874 // a global variable). In these two cases, we do a lookup for an ivar with 875 // this name, if the lookup sucedes, we replace it our current decl. 876 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 877 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 878 ObjCInterfaceDecl *ClassDeclared;
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880 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 881 ClassDeclared)) {
| 879 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
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882 // Check if referencing a field with __attribute__((deprecated)). 883 if (DiagnoseUseOfDecl(IV, Loc)) 884 return ExprError(); 885 886 // If we're referencing an invalid decl, just return this as a silent 887 // error node. The error diagnostic was already emitted on the decl. 888 if (IV->isInvalidDecl()) 889 return ExprError(); 890 891 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 892 // If a class method attemps to use a free standing ivar, this is 893 // an error. 894 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 895 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 896 << IV->getDeclName()); 897 // If a class method uses a global variable, even if an ivar with 898 // same name exists, use the global. 899 if (!IsClsMethod) { 900 if (IV->getAccessControl() == ObjCIvarDecl::Private && 901 ClassDeclared != IFace) 902 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 903 // FIXME: This should use a new expr for a direct reference, don't 904 // turn this into Self->ivar, just return a BareIVarExpr or something. 905 IdentifierInfo &II = Context.Idents.get("self"); 906 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 907 MarkDeclarationReferenced(Loc, IV); 908 return Owned(new (Context) 909 ObjCIvarRefExpr(IV, IV->getType(), Loc, 910 SelfExpr.takeAs<Expr>(), true, true)); 911 } 912 } 913 } 914 else if (getCurMethodDecl()->isInstanceMethod()) { 915 // We should warn if a local variable hides an ivar. 916 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 917 ObjCInterfaceDecl *ClassDeclared;
| 880 // Check if referencing a field with __attribute__((deprecated)). 881 if (DiagnoseUseOfDecl(IV, Loc)) 882 return ExprError(); 883 884 // If we're referencing an invalid decl, just return this as a silent 885 // error node. The error diagnostic was already emitted on the decl. 886 if (IV->isInvalidDecl()) 887 return ExprError(); 888 889 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 890 // If a class method attemps to use a free standing ivar, this is 891 // an error. 892 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 893 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 894 << IV->getDeclName()); 895 // If a class method uses a global variable, even if an ivar with 896 // same name exists, use the global. 897 if (!IsClsMethod) { 898 if (IV->getAccessControl() == ObjCIvarDecl::Private && 899 ClassDeclared != IFace) 900 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 901 // FIXME: This should use a new expr for a direct reference, don't 902 // turn this into Self->ivar, just return a BareIVarExpr or something. 903 IdentifierInfo &II = Context.Idents.get("self"); 904 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 905 MarkDeclarationReferenced(Loc, IV); 906 return Owned(new (Context) 907 ObjCIvarRefExpr(IV, IV->getType(), Loc, 908 SelfExpr.takeAs<Expr>(), true, true)); 909 } 910 } 911 } 912 else if (getCurMethodDecl()->isInstanceMethod()) { 913 // We should warn if a local variable hides an ivar. 914 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 915 ObjCInterfaceDecl *ClassDeclared;
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918 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 919 ClassDeclared)) {
| 916 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
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920 if (IV->getAccessControl() != ObjCIvarDecl::Private || 921 IFace == ClassDeclared) 922 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 923 } 924 } 925 // Needed to implement property "super.method" notation. 926 if (D == 0 && II->isStr("super")) { 927 QualType T; 928 929 if (getCurMethodDecl()->isInstanceMethod()) 930 T = Context.getPointerType(Context.getObjCInterfaceType( 931 getCurMethodDecl()->getClassInterface())); 932 else 933 T = Context.getObjCClassType(); 934 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 935 } 936 } 937 938 // Determine whether this name might be a candidate for 939 // argument-dependent lookup. 940 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 941 HasTrailingLParen; 942 943 if (ADL && D == 0) { 944 // We've seen something of the form 945 // 946 // identifier( 947 // 948 // and we did not find any entity by the name 949 // "identifier". However, this identifier is still subject to 950 // argument-dependent lookup, so keep track of the name. 951 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 952 Context.OverloadTy, 953 Loc)); 954 } 955 956 if (D == 0) { 957 // Otherwise, this could be an implicitly declared function reference (legal 958 // in C90, extension in C99). 959 if (HasTrailingLParen && II && 960 !getLangOptions().CPlusPlus) // Not in C++. 961 D = ImplicitlyDefineFunction(Loc, *II, S); 962 else { 963 // If this name wasn't predeclared and if this is not a function call, 964 // diagnose the problem. 965 if (SS && !SS->isEmpty()) 966 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 967 << Name << SS->getRange()); 968 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 969 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 970 return ExprError(Diag(Loc, diag::err_undeclared_use) 971 << Name.getAsString()); 972 else 973 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 974 } 975 }
| 917 if (IV->getAccessControl() != ObjCIvarDecl::Private || 918 IFace == ClassDeclared) 919 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 920 } 921 } 922 // Needed to implement property "super.method" notation. 923 if (D == 0 && II->isStr("super")) { 924 QualType T; 925 926 if (getCurMethodDecl()->isInstanceMethod()) 927 T = Context.getPointerType(Context.getObjCInterfaceType( 928 getCurMethodDecl()->getClassInterface())); 929 else 930 T = Context.getObjCClassType(); 931 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 932 } 933 } 934 935 // Determine whether this name might be a candidate for 936 // argument-dependent lookup. 937 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 938 HasTrailingLParen; 939 940 if (ADL && D == 0) { 941 // We've seen something of the form 942 // 943 // identifier( 944 // 945 // and we did not find any entity by the name 946 // "identifier". However, this identifier is still subject to 947 // argument-dependent lookup, so keep track of the name. 948 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 949 Context.OverloadTy, 950 Loc)); 951 } 952 953 if (D == 0) { 954 // Otherwise, this could be an implicitly declared function reference (legal 955 // in C90, extension in C99). 956 if (HasTrailingLParen && II && 957 !getLangOptions().CPlusPlus) // Not in C++. 958 D = ImplicitlyDefineFunction(Loc, *II, S); 959 else { 960 // If this name wasn't predeclared and if this is not a function call, 961 // diagnose the problem. 962 if (SS && !SS->isEmpty()) 963 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 964 << Name << SS->getRange()); 965 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 966 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 967 return ExprError(Diag(Loc, diag::err_undeclared_use) 968 << Name.getAsString()); 969 else 970 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 971 } 972 }
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| 973 974 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 975 // Warn about constructs like: 976 // if (void *X = foo()) { ... } else { X }. 977 // In the else block, the pointer is always false. 978 979 // FIXME: In a template instantiation, we don't have scope 980 // information to check this property. 981 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 982 Scope *CheckS = S; 983 while (CheckS) { 984 if (CheckS->isWithinElse() && 985 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 986 if (Var->getType()->isBooleanType()) 987 ExprError(Diag(Loc, diag::warn_value_always_false) 988 << Var->getDeclName()); 989 else 990 ExprError(Diag(Loc, diag::warn_value_always_zero) 991 << Var->getDeclName()); 992 break; 993 } 994 995 // Move up one more control parent to check again. 996 CheckS = CheckS->getControlParent(); 997 if (CheckS) 998 CheckS = CheckS->getParent(); 999 } 1000 } 1001 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 1002 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1003 // C99 DR 316 says that, if a function type comes from a 1004 // function definition (without a prototype), that type is only 1005 // used for checking compatibility. Therefore, when referencing 1006 // the function, we pretend that we don't have the full function 1007 // type. 1008 if (DiagnoseUseOfDecl(Func, Loc)) 1009 return ExprError();
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976
| 1010
|
| 1011 QualType T = Func->getType(); 1012 QualType NoProtoType = T; 1013 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1014 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1015 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 1016 } 1017 } 1018 1019 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 1020} 1021 1022/// \brief Complete semantic analysis for a reference to the given declaration. 1023Sema::OwningExprResult 1024Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 1025 bool HasTrailingLParen, 1026 const CXXScopeSpec *SS, 1027 bool isAddressOfOperand) { 1028 assert(D && "Cannot refer to a NULL declaration"); 1029 DeclarationName Name = D->getDeclName(); 1030
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977 // If this is an expression of the form &Class::member, don't build an 978 // implicit member ref, because we want a pointer to the member in general, 979 // not any specific instance's member. 980 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 981 DeclContext *DC = computeDeclContext(*SS); 982 if (D && isa<CXXRecordDecl>(DC)) { 983 QualType DType; 984 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 985 DType = FD->getType().getNonReferenceType(); 986 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 987 DType = Method->getType(); 988 } else if (isa<OverloadedFunctionDecl>(D)) { 989 DType = Context.OverloadTy; 990 } 991 // Could be an inner type. That's diagnosed below, so ignore it here. 992 if (!DType.isNull()) { 993 // The pointer is type- and value-dependent if it points into something 994 // dependent. 995 bool Dependent = DC->isDependentContext(); 996 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 997 } 998 } 999 } 1000 1001 // We may have found a field within an anonymous union or struct 1002 // (C++ [class.union]). 1003 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 1004 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1005 return BuildAnonymousStructUnionMemberReference(Loc, FD); 1006 1007 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1008 if (!MD->isStatic()) { 1009 // C++ [class.mfct.nonstatic]p2: 1010 // [...] if name lookup (3.4.1) resolves the name in the 1011 // id-expression to a nonstatic nontype member of class X or of 1012 // a base class of X, the id-expression is transformed into a 1013 // class member access expression (5.2.5) using (*this) (9.3.2) 1014 // as the postfix-expression to the left of the '.' operator. 1015 DeclContext *Ctx = 0; 1016 QualType MemberType; 1017 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1018 Ctx = FD->getDeclContext(); 1019 MemberType = FD->getType(); 1020 1021 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 1022 MemberType = RefType->getPointeeType(); 1023 else if (!FD->isMutable()) { 1024 unsigned combinedQualifiers 1025 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 1026 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1027 } 1028 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1029 if (!Method->isStatic()) { 1030 Ctx = Method->getParent(); 1031 MemberType = Method->getType(); 1032 } 1033 } else if (OverloadedFunctionDecl *Ovl 1034 = dyn_cast<OverloadedFunctionDecl>(D)) { 1035 for (OverloadedFunctionDecl::function_iterator 1036 Func = Ovl->function_begin(), 1037 FuncEnd = Ovl->function_end(); 1038 Func != FuncEnd; ++Func) { 1039 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1040 if (!DMethod->isStatic()) { 1041 Ctx = Ovl->getDeclContext(); 1042 MemberType = Context.OverloadTy; 1043 break; 1044 } 1045 } 1046 } 1047 1048 if (Ctx && Ctx->isRecord()) { 1049 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1050 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1051 if ((Context.getCanonicalType(CtxType) 1052 == Context.getCanonicalType(ThisType)) || 1053 IsDerivedFrom(ThisType, CtxType)) { 1054 // Build the implicit member access expression. 1055 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1056 MD->getThisType(Context)); 1057 MarkDeclarationReferenced(Loc, D); 1058 return Owned(new (Context) MemberExpr(This, true, D, 1059 Loc, MemberType)); 1060 } 1061 } 1062 } 1063 } 1064 1065 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1066 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1067 if (MD->isStatic()) 1068 // "invalid use of member 'x' in static member function" 1069 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1070 << FD->getDeclName()); 1071 } 1072 1073 // Any other ways we could have found the field in a well-formed 1074 // program would have been turned into implicit member expressions 1075 // above. 1076 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1077 << FD->getDeclName()); 1078 } 1079 1080 if (isa<TypedefDecl>(D)) 1081 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1082 if (isa<ObjCInterfaceDecl>(D)) 1083 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1084 if (isa<NamespaceDecl>(D)) 1085 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1086 1087 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1088 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1089 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1090 false, false, SS); 1091 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1092 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1093 false, false, SS); 1094 ValueDecl *VD = cast<ValueDecl>(D); 1095 1096 // Check whether this declaration can be used. Note that we suppress 1097 // this check when we're going to perform argument-dependent lookup 1098 // on this function name, because this might not be the function 1099 // that overload resolution actually selects.
| 1031 // If this is an expression of the form &Class::member, don't build an 1032 // implicit member ref, because we want a pointer to the member in general, 1033 // not any specific instance's member. 1034 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 1035 DeclContext *DC = computeDeclContext(*SS); 1036 if (D && isa<CXXRecordDecl>(DC)) { 1037 QualType DType; 1038 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1039 DType = FD->getType().getNonReferenceType(); 1040 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1041 DType = Method->getType(); 1042 } else if (isa<OverloadedFunctionDecl>(D)) { 1043 DType = Context.OverloadTy; 1044 } 1045 // Could be an inner type. That's diagnosed below, so ignore it here. 1046 if (!DType.isNull()) { 1047 // The pointer is type- and value-dependent if it points into something 1048 // dependent. 1049 bool Dependent = DC->isDependentContext(); 1050 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 1051 } 1052 } 1053 } 1054 1055 // We may have found a field within an anonymous union or struct 1056 // (C++ [class.union]). 1057 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 1058 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1059 return BuildAnonymousStructUnionMemberReference(Loc, FD); 1060 1061 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1062 if (!MD->isStatic()) { 1063 // C++ [class.mfct.nonstatic]p2: 1064 // [...] if name lookup (3.4.1) resolves the name in the 1065 // id-expression to a nonstatic nontype member of class X or of 1066 // a base class of X, the id-expression is transformed into a 1067 // class member access expression (5.2.5) using (*this) (9.3.2) 1068 // as the postfix-expression to the left of the '.' operator. 1069 DeclContext *Ctx = 0; 1070 QualType MemberType; 1071 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1072 Ctx = FD->getDeclContext(); 1073 MemberType = FD->getType(); 1074 1075 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 1076 MemberType = RefType->getPointeeType(); 1077 else if (!FD->isMutable()) { 1078 unsigned combinedQualifiers 1079 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 1080 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1081 } 1082 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1083 if (!Method->isStatic()) { 1084 Ctx = Method->getParent(); 1085 MemberType = Method->getType(); 1086 } 1087 } else if (OverloadedFunctionDecl *Ovl 1088 = dyn_cast<OverloadedFunctionDecl>(D)) { 1089 for (OverloadedFunctionDecl::function_iterator 1090 Func = Ovl->function_begin(), 1091 FuncEnd = Ovl->function_end(); 1092 Func != FuncEnd; ++Func) { 1093 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1094 if (!DMethod->isStatic()) { 1095 Ctx = Ovl->getDeclContext(); 1096 MemberType = Context.OverloadTy; 1097 break; 1098 } 1099 } 1100 } 1101 1102 if (Ctx && Ctx->isRecord()) { 1103 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1104 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1105 if ((Context.getCanonicalType(CtxType) 1106 == Context.getCanonicalType(ThisType)) || 1107 IsDerivedFrom(ThisType, CtxType)) { 1108 // Build the implicit member access expression. 1109 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1110 MD->getThisType(Context)); 1111 MarkDeclarationReferenced(Loc, D); 1112 return Owned(new (Context) MemberExpr(This, true, D, 1113 Loc, MemberType)); 1114 } 1115 } 1116 } 1117 } 1118 1119 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1120 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1121 if (MD->isStatic()) 1122 // "invalid use of member 'x' in static member function" 1123 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1124 << FD->getDeclName()); 1125 } 1126 1127 // Any other ways we could have found the field in a well-formed 1128 // program would have been turned into implicit member expressions 1129 // above. 1130 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1131 << FD->getDeclName()); 1132 } 1133 1134 if (isa<TypedefDecl>(D)) 1135 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1136 if (isa<ObjCInterfaceDecl>(D)) 1137 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1138 if (isa<NamespaceDecl>(D)) 1139 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1140 1141 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1142 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1143 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1144 false, false, SS); 1145 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1146 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1147 false, false, SS); 1148 ValueDecl *VD = cast<ValueDecl>(D); 1149 1150 // Check whether this declaration can be used. Note that we suppress 1151 // this check when we're going to perform argument-dependent lookup 1152 // on this function name, because this might not be the function 1153 // that overload resolution actually selects.
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| 1154 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1155 HasTrailingLParen;
|
1100 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1101 return ExprError(); 1102
| 1156 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1157 return ExprError(); 1158
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1103 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 1104 // Warn about constructs like: 1105 // if (void *X = foo()) { ... } else { X }. 1106 // In the else block, the pointer is always false. 1107 1108 // FIXME: In a template instantiation, we don't have scope 1109 // information to check this property. 1110 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 1111 Scope *CheckS = S; 1112 while (CheckS) { 1113 if (CheckS->isWithinElse() && 1114 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 1115 if (Var->getType()->isBooleanType()) 1116 ExprError(Diag(Loc, diag::warn_value_always_false) 1117 << Var->getDeclName()); 1118 else 1119 ExprError(Diag(Loc, diag::warn_value_always_zero) 1120 << Var->getDeclName()); 1121 break; 1122 } 1123 1124 // Move up one more control parent to check again. 1125 CheckS = CheckS->getControlParent(); 1126 if (CheckS) 1127 CheckS = CheckS->getParent(); 1128 } 1129 } 1130 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 1131 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1132 // C99 DR 316 says that, if a function type comes from a 1133 // function definition (without a prototype), that type is only 1134 // used for checking compatibility. Therefore, when referencing 1135 // the function, we pretend that we don't have the full function 1136 // type. 1137 QualType T = Func->getType(); 1138 QualType NoProtoType = T; 1139 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1140 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1141 return BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS); 1142 } 1143 } 1144
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1145 // Only create DeclRefExpr's for valid Decl's. 1146 if (VD->isInvalidDecl()) 1147 return ExprError(); 1148 1149 // If the identifier reference is inside a block, and it refers to a value 1150 // that is outside the block, create a BlockDeclRefExpr instead of a 1151 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1152 // the block is formed. 1153 // 1154 // We do not do this for things like enum constants, global variables, etc, 1155 // as they do not get snapshotted. 1156 // 1157 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1158 MarkDeclarationReferenced(Loc, VD); 1159 QualType ExprTy = VD->getType().getNonReferenceType(); 1160 // The BlocksAttr indicates the variable is bound by-reference.
| 1159 // Only create DeclRefExpr's for valid Decl's. 1160 if (VD->isInvalidDecl()) 1161 return ExprError(); 1162 1163 // If the identifier reference is inside a block, and it refers to a value 1164 // that is outside the block, create a BlockDeclRefExpr instead of a 1165 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1166 // the block is formed. 1167 // 1168 // We do not do this for things like enum constants, global variables, etc, 1169 // as they do not get snapshotted. 1170 // 1171 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1172 MarkDeclarationReferenced(Loc, VD); 1173 QualType ExprTy = VD->getType().getNonReferenceType(); 1174 // The BlocksAttr indicates the variable is bound by-reference.
|
1161 if (VD->getAttr<BlocksAttr>(Context))
| 1175 if (VD->getAttr())
|
1162 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1163 // This is to record that a 'const' was actually synthesize and added. 1164 bool constAdded = !ExprTy.isConstQualified(); 1165 // Variable will be bound by-copy, make it const within the closure. 1166 1167 ExprTy.addConst(); 1168 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1169 constAdded)); 1170 } 1171 // If this reference is not in a block or if the referenced variable is 1172 // within the block, create a normal DeclRefExpr. 1173 1174 bool TypeDependent = false; 1175 bool ValueDependent = false; 1176 if (getLangOptions().CPlusPlus) { 1177 // C++ [temp.dep.expr]p3: 1178 // An id-expression is type-dependent if it contains: 1179 // - an identifier that was declared with a dependent type, 1180 if (VD->getType()->isDependentType()) 1181 TypeDependent = true; 1182 // - FIXME: a template-id that is dependent, 1183 // - a conversion-function-id that specifies a dependent type, 1184 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1185 Name.getCXXNameType()->isDependentType()) 1186 TypeDependent = true; 1187 // - a nested-name-specifier that contains a class-name that 1188 // names a dependent type. 1189 else if (SS && !SS->isEmpty()) { 1190 for (DeclContext *DC = computeDeclContext(*SS); 1191 DC; DC = DC->getParent()) { 1192 // FIXME: could stop early at namespace scope. 1193 if (DC->isRecord()) { 1194 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1195 if (Context.getTypeDeclType(Record)->isDependentType()) { 1196 TypeDependent = true; 1197 break; 1198 } 1199 } 1200 } 1201 } 1202 1203 // C++ [temp.dep.constexpr]p2: 1204 // 1205 // An identifier is value-dependent if it is: 1206 // - a name declared with a dependent type, 1207 if (TypeDependent) 1208 ValueDependent = true; 1209 // - the name of a non-type template parameter, 1210 else if (isa<NonTypeTemplateParmDecl>(VD)) 1211 ValueDependent = true; 1212 // - a constant with integral or enumeration type and is 1213 // initialized with an expression that is value-dependent 1214 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1215 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1216 Dcl->getInit()) { 1217 ValueDependent = Dcl->getInit()->isValueDependent(); 1218 } 1219 } 1220 } 1221 1222 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1223 TypeDependent, ValueDependent, SS); 1224} 1225 1226Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1227 tok::TokenKind Kind) { 1228 PredefinedExpr::IdentType IT; 1229 1230 switch (Kind) { 1231 default: assert(0 && "Unknown simple primary expr!"); 1232 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1233 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1234 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1235 } 1236 1237 // Pre-defined identifiers are of type char[x], where x is the length of the 1238 // string. 1239 unsigned Length; 1240 if (FunctionDecl *FD = getCurFunctionDecl()) 1241 Length = FD->getIdentifier()->getLength(); 1242 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1243 Length = MD->getSynthesizedMethodSize(); 1244 else { 1245 Diag(Loc, diag::ext_predef_outside_function); 1246 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1247 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1248 } 1249 1250 1251 llvm::APInt LengthI(32, Length + 1); 1252 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1253 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1254 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1255} 1256 1257Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1258 llvm::SmallString<16> CharBuffer; 1259 CharBuffer.resize(Tok.getLength()); 1260 const char *ThisTokBegin = &CharBuffer[0]; 1261 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1262 1263 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1264 Tok.getLocation(), PP); 1265 if (Literal.hadError()) 1266 return ExprError(); 1267 1268 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1269 1270 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1271 Literal.isWide(), 1272 type, Tok.getLocation())); 1273} 1274 1275Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1276 // Fast path for a single digit (which is quite common). A single digit 1277 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1278 if (Tok.getLength() == 1) { 1279 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1280 unsigned IntSize = Context.Target.getIntWidth(); 1281 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1282 Context.IntTy, Tok.getLocation())); 1283 } 1284 1285 llvm::SmallString<512> IntegerBuffer; 1286 // Add padding so that NumericLiteralParser can overread by one character. 1287 IntegerBuffer.resize(Tok.getLength()+1); 1288 const char *ThisTokBegin = &IntegerBuffer[0]; 1289 1290 // Get the spelling of the token, which eliminates trigraphs, etc. 1291 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1292 1293 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1294 Tok.getLocation(), PP); 1295 if (Literal.hadError) 1296 return ExprError(); 1297 1298 Expr *Res; 1299 1300 if (Literal.isFloatingLiteral()) { 1301 QualType Ty; 1302 if (Literal.isFloat) 1303 Ty = Context.FloatTy; 1304 else if (!Literal.isLong) 1305 Ty = Context.DoubleTy; 1306 else 1307 Ty = Context.LongDoubleTy; 1308 1309 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1310 1311 // isExact will be set by GetFloatValue(). 1312 bool isExact = false;
| 1176 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1177 // This is to record that a 'const' was actually synthesize and added. 1178 bool constAdded = !ExprTy.isConstQualified(); 1179 // Variable will be bound by-copy, make it const within the closure. 1180 1181 ExprTy.addConst(); 1182 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1183 constAdded)); 1184 } 1185 // If this reference is not in a block or if the referenced variable is 1186 // within the block, create a normal DeclRefExpr. 1187 1188 bool TypeDependent = false; 1189 bool ValueDependent = false; 1190 if (getLangOptions().CPlusPlus) { 1191 // C++ [temp.dep.expr]p3: 1192 // An id-expression is type-dependent if it contains: 1193 // - an identifier that was declared with a dependent type, 1194 if (VD->getType()->isDependentType()) 1195 TypeDependent = true; 1196 // - FIXME: a template-id that is dependent, 1197 // - a conversion-function-id that specifies a dependent type, 1198 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1199 Name.getCXXNameType()->isDependentType()) 1200 TypeDependent = true; 1201 // - a nested-name-specifier that contains a class-name that 1202 // names a dependent type. 1203 else if (SS && !SS->isEmpty()) { 1204 for (DeclContext *DC = computeDeclContext(*SS); 1205 DC; DC = DC->getParent()) { 1206 // FIXME: could stop early at namespace scope. 1207 if (DC->isRecord()) { 1208 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1209 if (Context.getTypeDeclType(Record)->isDependentType()) { 1210 TypeDependent = true; 1211 break; 1212 } 1213 } 1214 } 1215 } 1216 1217 // C++ [temp.dep.constexpr]p2: 1218 // 1219 // An identifier is value-dependent if it is: 1220 // - a name declared with a dependent type, 1221 if (TypeDependent) 1222 ValueDependent = true; 1223 // - the name of a non-type template parameter, 1224 else if (isa<NonTypeTemplateParmDecl>(VD)) 1225 ValueDependent = true; 1226 // - a constant with integral or enumeration type and is 1227 // initialized with an expression that is value-dependent 1228 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1229 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1230 Dcl->getInit()) { 1231 ValueDependent = Dcl->getInit()->isValueDependent(); 1232 } 1233 } 1234 } 1235 1236 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1237 TypeDependent, ValueDependent, SS); 1238} 1239 1240Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1241 tok::TokenKind Kind) { 1242 PredefinedExpr::IdentType IT; 1243 1244 switch (Kind) { 1245 default: assert(0 && "Unknown simple primary expr!"); 1246 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1247 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1248 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1249 } 1250 1251 // Pre-defined identifiers are of type char[x], where x is the length of the 1252 // string. 1253 unsigned Length; 1254 if (FunctionDecl *FD = getCurFunctionDecl()) 1255 Length = FD->getIdentifier()->getLength(); 1256 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1257 Length = MD->getSynthesizedMethodSize(); 1258 else { 1259 Diag(Loc, diag::ext_predef_outside_function); 1260 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1261 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1262 } 1263 1264 1265 llvm::APInt LengthI(32, Length + 1); 1266 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1267 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1268 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1269} 1270 1271Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1272 llvm::SmallString<16> CharBuffer; 1273 CharBuffer.resize(Tok.getLength()); 1274 const char *ThisTokBegin = &CharBuffer[0]; 1275 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1276 1277 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1278 Tok.getLocation(), PP); 1279 if (Literal.hadError()) 1280 return ExprError(); 1281 1282 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1283 1284 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1285 Literal.isWide(), 1286 type, Tok.getLocation())); 1287} 1288 1289Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1290 // Fast path for a single digit (which is quite common). A single digit 1291 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1292 if (Tok.getLength() == 1) { 1293 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1294 unsigned IntSize = Context.Target.getIntWidth(); 1295 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1296 Context.IntTy, Tok.getLocation())); 1297 } 1298 1299 llvm::SmallString<512> IntegerBuffer; 1300 // Add padding so that NumericLiteralParser can overread by one character. 1301 IntegerBuffer.resize(Tok.getLength()+1); 1302 const char *ThisTokBegin = &IntegerBuffer[0]; 1303 1304 // Get the spelling of the token, which eliminates trigraphs, etc. 1305 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1306 1307 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1308 Tok.getLocation(), PP); 1309 if (Literal.hadError) 1310 return ExprError(); 1311 1312 Expr *Res; 1313 1314 if (Literal.isFloatingLiteral()) { 1315 QualType Ty; 1316 if (Literal.isFloat) 1317 Ty = Context.FloatTy; 1318 else if (!Literal.isLong) 1319 Ty = Context.DoubleTy; 1320 else 1321 Ty = Context.LongDoubleTy; 1322 1323 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1324 1325 // isExact will be set by GetFloatValue(). 1326 bool isExact = false;
|
1313 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1314 &isExact, Ty, Tok.getLocation());
| 1327 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1328 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation());
|
1315 1316 } else if (!Literal.isIntegerLiteral()) { 1317 return ExprError(); 1318 } else { 1319 QualType Ty; 1320 1321 // long long is a C99 feature. 1322 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1323 Literal.isLongLong) 1324 Diag(Tok.getLocation(), diag::ext_longlong); 1325 1326 // Get the value in the widest-possible width. 1327 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1328 1329 if (Literal.GetIntegerValue(ResultVal)) { 1330 // If this value didn't fit into uintmax_t, warn and force to ull. 1331 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1332 Ty = Context.UnsignedLongLongTy; 1333 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1334 "long long is not intmax_t?"); 1335 } else { 1336 // If this value fits into a ULL, try to figure out what else it fits into 1337 // according to the rules of C99 6.4.4.1p5. 1338 1339 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1340 // be an unsigned int. 1341 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1342 1343 // Check from smallest to largest, picking the smallest type we can. 1344 unsigned Width = 0; 1345 if (!Literal.isLong && !Literal.isLongLong) { 1346 // Are int/unsigned possibilities? 1347 unsigned IntSize = Context.Target.getIntWidth(); 1348 1349 // Does it fit in a unsigned int? 1350 if (ResultVal.isIntN(IntSize)) { 1351 // Does it fit in a signed int? 1352 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1353 Ty = Context.IntTy; 1354 else if (AllowUnsigned) 1355 Ty = Context.UnsignedIntTy; 1356 Width = IntSize; 1357 } 1358 } 1359 1360 // Are long/unsigned long possibilities? 1361 if (Ty.isNull() && !Literal.isLongLong) { 1362 unsigned LongSize = Context.Target.getLongWidth(); 1363 1364 // Does it fit in a unsigned long? 1365 if (ResultVal.isIntN(LongSize)) { 1366 // Does it fit in a signed long? 1367 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1368 Ty = Context.LongTy; 1369 else if (AllowUnsigned) 1370 Ty = Context.UnsignedLongTy; 1371 Width = LongSize; 1372 } 1373 } 1374 1375 // Finally, check long long if needed. 1376 if (Ty.isNull()) { 1377 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1378 1379 // Does it fit in a unsigned long long? 1380 if (ResultVal.isIntN(LongLongSize)) { 1381 // Does it fit in a signed long long? 1382 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1383 Ty = Context.LongLongTy; 1384 else if (AllowUnsigned) 1385 Ty = Context.UnsignedLongLongTy; 1386 Width = LongLongSize; 1387 } 1388 } 1389 1390 // If we still couldn't decide a type, we probably have something that 1391 // does not fit in a signed long long, but has no U suffix. 1392 if (Ty.isNull()) { 1393 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1394 Ty = Context.UnsignedLongLongTy; 1395 Width = Context.Target.getLongLongWidth(); 1396 } 1397 1398 if (ResultVal.getBitWidth() != Width) 1399 ResultVal.trunc(Width); 1400 } 1401 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1402 } 1403 1404 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1405 if (Literal.isImaginary) 1406 Res = new (Context) ImaginaryLiteral(Res, 1407 Context.getComplexType(Res->getType())); 1408 1409 return Owned(Res); 1410} 1411 1412Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1413 SourceLocation R, ExprArg Val) { 1414 Expr *E = Val.takeAs<Expr>(); 1415 assert((E != 0) && "ActOnParenExpr() missing expr"); 1416 return Owned(new (Context) ParenExpr(L, R, E)); 1417} 1418 1419/// The UsualUnaryConversions() function is *not* called by this routine. 1420/// See C99 6.3.2.1p[2-4] for more details. 1421bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1422 SourceLocation OpLoc, 1423 const SourceRange &ExprRange, 1424 bool isSizeof) { 1425 if (exprType->isDependentType()) 1426 return false; 1427 1428 // C99 6.5.3.4p1: 1429 if (isa<FunctionType>(exprType)) { 1430 // alignof(function) is allowed as an extension. 1431 if (isSizeof) 1432 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1433 return false; 1434 } 1435 1436 // Allow sizeof(void)/alignof(void) as an extension. 1437 if (exprType->isVoidType()) { 1438 Diag(OpLoc, diag::ext_sizeof_void_type) 1439 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1440 return false; 1441 } 1442 1443 if (RequireCompleteType(OpLoc, exprType, 1444 isSizeof ? diag::err_sizeof_incomplete_type : 1445 diag::err_alignof_incomplete_type, 1446 ExprRange)) 1447 return true; 1448 1449 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1450 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1451 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1452 << exprType << isSizeof << ExprRange; 1453 return true; 1454 } 1455 1456 return false; 1457} 1458 1459bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1460 const SourceRange &ExprRange) { 1461 E = E->IgnoreParens(); 1462 1463 // alignof decl is always ok. 1464 if (isa<DeclRefExpr>(E)) 1465 return false; 1466 1467 // Cannot know anything else if the expression is dependent. 1468 if (E->isTypeDependent()) 1469 return false; 1470 1471 if (E->getBitField()) { 1472 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1473 return true; 1474 } 1475 1476 // Alignment of a field access is always okay, so long as it isn't a 1477 // bit-field. 1478 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1479 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1480 return false; 1481 1482 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1483} 1484 1485/// \brief Build a sizeof or alignof expression given a type operand. 1486Action::OwningExprResult 1487Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1488 bool isSizeOf, SourceRange R) { 1489 if (T.isNull()) 1490 return ExprError(); 1491 1492 if (!T->isDependentType() && 1493 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1494 return ExprError(); 1495 1496 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1497 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1498 Context.getSizeType(), OpLoc, 1499 R.getEnd())); 1500} 1501 1502/// \brief Build a sizeof or alignof expression given an expression 1503/// operand. 1504Action::OwningExprResult 1505Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1506 bool isSizeOf, SourceRange R) { 1507 // Verify that the operand is valid. 1508 bool isInvalid = false; 1509 if (E->isTypeDependent()) { 1510 // Delay type-checking for type-dependent expressions. 1511 } else if (!isSizeOf) { 1512 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1513 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1514 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1515 isInvalid = true; 1516 } else { 1517 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1518 } 1519 1520 if (isInvalid) 1521 return ExprError(); 1522 1523 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1524 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1525 Context.getSizeType(), OpLoc, 1526 R.getEnd())); 1527} 1528 1529/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1530/// the same for @c alignof and @c __alignof 1531/// Note that the ArgRange is invalid if isType is false. 1532Action::OwningExprResult 1533Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1534 void *TyOrEx, const SourceRange &ArgRange) { 1535 // If error parsing type, ignore. 1536 if (TyOrEx == 0) return ExprError(); 1537 1538 if (isType) { 1539 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1540 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1541 } 1542 1543 // Get the end location. 1544 Expr *ArgEx = (Expr *)TyOrEx; 1545 Action::OwningExprResult Result 1546 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1547 1548 if (Result.isInvalid()) 1549 DeleteExpr(ArgEx); 1550 1551 return move(Result); 1552} 1553 1554QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1555 if (V->isTypeDependent()) 1556 return Context.DependentTy; 1557 1558 // These operators return the element type of a complex type. 1559 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1560 return CT->getElementType(); 1561 1562 // Otherwise they pass through real integer and floating point types here. 1563 if (V->getType()->isArithmeticType()) 1564 return V->getType(); 1565 1566 // Reject anything else. 1567 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1568 << (isReal ? "__real" : "__imag"); 1569 return QualType(); 1570} 1571 1572 1573 1574Action::OwningExprResult 1575Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1576 tok::TokenKind Kind, ExprArg Input) { 1577 Expr *Arg = (Expr *)Input.get(); 1578 1579 UnaryOperator::Opcode Opc; 1580 switch (Kind) { 1581 default: assert(0 && "Unknown unary op!"); 1582 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1583 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1584 } 1585 1586 if (getLangOptions().CPlusPlus && 1587 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1588 // Which overloaded operator? 1589 OverloadedOperatorKind OverOp = 1590 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1591 1592 // C++ [over.inc]p1: 1593 // 1594 // [...] If the function is a member function with one 1595 // parameter (which shall be of type int) or a non-member 1596 // function with two parameters (the second of which shall be 1597 // of type int), it defines the postfix increment operator ++ 1598 // for objects of that type. When the postfix increment is 1599 // called as a result of using the ++ operator, the int 1600 // argument will have value zero. 1601 Expr *Args[2] = { 1602 Arg, 1603 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1604 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1605 }; 1606 1607 // Build the candidate set for overloading 1608 OverloadCandidateSet CandidateSet; 1609 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1610 1611 // Perform overload resolution. 1612 OverloadCandidateSet::iterator Best; 1613 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1614 case OR_Success: { 1615 // We found a built-in operator or an overloaded operator. 1616 FunctionDecl *FnDecl = Best->Function; 1617 1618 if (FnDecl) { 1619 // We matched an overloaded operator. Build a call to that 1620 // operator. 1621 1622 // Convert the arguments. 1623 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1624 if (PerformObjectArgumentInitialization(Arg, Method)) 1625 return ExprError(); 1626 } else { 1627 // Convert the arguments. 1628 if (PerformCopyInitialization(Arg, 1629 FnDecl->getParamDecl(0)->getType(), 1630 "passing")) 1631 return ExprError(); 1632 } 1633 1634 // Determine the result type 1635 QualType ResultTy 1636 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1637 ResultTy = ResultTy.getNonReferenceType(); 1638 1639 // Build the actual expression node. 1640 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1641 SourceLocation()); 1642 UsualUnaryConversions(FnExpr); 1643 1644 Input.release(); 1645 Args[0] = Arg; 1646 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1647 Args, 2, ResultTy, 1648 OpLoc)); 1649 } else { 1650 // We matched a built-in operator. Convert the arguments, then 1651 // break out so that we will build the appropriate built-in 1652 // operator node. 1653 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1654 "passing")) 1655 return ExprError(); 1656 1657 break; 1658 } 1659 } 1660 1661 case OR_No_Viable_Function: 1662 // No viable function; fall through to handling this as a 1663 // built-in operator, which will produce an error message for us. 1664 break; 1665 1666 case OR_Ambiguous: 1667 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1668 << UnaryOperator::getOpcodeStr(Opc) 1669 << Arg->getSourceRange(); 1670 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1671 return ExprError(); 1672 1673 case OR_Deleted: 1674 Diag(OpLoc, diag::err_ovl_deleted_oper) 1675 << Best->Function->isDeleted() 1676 << UnaryOperator::getOpcodeStr(Opc) 1677 << Arg->getSourceRange(); 1678 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1679 return ExprError(); 1680 } 1681 1682 // Either we found no viable overloaded operator or we matched a 1683 // built-in operator. In either case, fall through to trying to 1684 // build a built-in operation. 1685 } 1686 1687 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1688 Opc == UnaryOperator::PostInc); 1689 if (result.isNull()) 1690 return ExprError(); 1691 Input.release(); 1692 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1693} 1694 1695Action::OwningExprResult 1696Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1697 ExprArg Idx, SourceLocation RLoc) { 1698 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1699 *RHSExp = static_cast<Expr*>(Idx.get()); 1700 1701 if (getLangOptions().CPlusPlus && 1702 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1703 Base.release(); 1704 Idx.release(); 1705 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1706 Context.DependentTy, RLoc)); 1707 } 1708 1709 if (getLangOptions().CPlusPlus && 1710 (LHSExp->getType()->isRecordType() || 1711 LHSExp->getType()->isEnumeralType() || 1712 RHSExp->getType()->isRecordType() || 1713 RHSExp->getType()->isEnumeralType())) { 1714 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1715 // to the candidate set. 1716 OverloadCandidateSet CandidateSet; 1717 Expr *Args[2] = { LHSExp, RHSExp }; 1718 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1719 SourceRange(LLoc, RLoc)); 1720 1721 // Perform overload resolution. 1722 OverloadCandidateSet::iterator Best; 1723 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1724 case OR_Success: { 1725 // We found a built-in operator or an overloaded operator. 1726 FunctionDecl *FnDecl = Best->Function; 1727 1728 if (FnDecl) { 1729 // We matched an overloaded operator. Build a call to that 1730 // operator. 1731 1732 // Convert the arguments. 1733 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1734 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1735 PerformCopyInitialization(RHSExp, 1736 FnDecl->getParamDecl(0)->getType(), 1737 "passing")) 1738 return ExprError(); 1739 } else { 1740 // Convert the arguments. 1741 if (PerformCopyInitialization(LHSExp, 1742 FnDecl->getParamDecl(0)->getType(), 1743 "passing") || 1744 PerformCopyInitialization(RHSExp, 1745 FnDecl->getParamDecl(1)->getType(), 1746 "passing")) 1747 return ExprError(); 1748 } 1749 1750 // Determine the result type 1751 QualType ResultTy 1752 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1753 ResultTy = ResultTy.getNonReferenceType(); 1754 1755 // Build the actual expression node. 1756 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1757 SourceLocation()); 1758 UsualUnaryConversions(FnExpr); 1759 1760 Base.release(); 1761 Idx.release(); 1762 Args[0] = LHSExp; 1763 Args[1] = RHSExp; 1764 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1765 FnExpr, Args, 2, 1766 ResultTy, LLoc)); 1767 } else { 1768 // We matched a built-in operator. Convert the arguments, then 1769 // break out so that we will build the appropriate built-in 1770 // operator node. 1771 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1772 "passing") || 1773 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1774 "passing")) 1775 return ExprError(); 1776 1777 break; 1778 } 1779 } 1780 1781 case OR_No_Viable_Function: 1782 // No viable function; fall through to handling this as a 1783 // built-in operator, which will produce an error message for us. 1784 break; 1785 1786 case OR_Ambiguous: 1787 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1788 << "[]" 1789 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1790 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1791 return ExprError(); 1792 1793 case OR_Deleted: 1794 Diag(LLoc, diag::err_ovl_deleted_oper) 1795 << Best->Function->isDeleted() 1796 << "[]" 1797 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1798 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1799 return ExprError(); 1800 } 1801 1802 // Either we found no viable overloaded operator or we matched a 1803 // built-in operator. In either case, fall through to trying to 1804 // build a built-in operation. 1805 } 1806 1807 // Perform default conversions. 1808 DefaultFunctionArrayConversion(LHSExp); 1809 DefaultFunctionArrayConversion(RHSExp); 1810 1811 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1812 1813 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1814 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1815 // in the subscript position. As a result, we need to derive the array base 1816 // and index from the expression types. 1817 Expr *BaseExpr, *IndexExpr; 1818 QualType ResultType; 1819 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1820 BaseExpr = LHSExp; 1821 IndexExpr = RHSExp; 1822 ResultType = Context.DependentTy; 1823 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1824 BaseExpr = LHSExp; 1825 IndexExpr = RHSExp; 1826 ResultType = PTy->getPointeeType(); 1827 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1828 // Handle the uncommon case of "123[Ptr]". 1829 BaseExpr = RHSExp; 1830 IndexExpr = LHSExp; 1831 ResultType = PTy->getPointeeType(); 1832 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1833 BaseExpr = LHSExp; // vectors: V[123] 1834 IndexExpr = RHSExp; 1835 1836 // FIXME: need to deal with const... 1837 ResultType = VTy->getElementType(); 1838 } else if (LHSTy->isArrayType()) { 1839 // If we see an array that wasn't promoted by 1840 // DefaultFunctionArrayConversion, it must be an array that 1841 // wasn't promoted because of the C90 rule that doesn't 1842 // allow promoting non-lvalue arrays. Warn, then 1843 // force the promotion here. 1844 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1845 LHSExp->getSourceRange(); 1846 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1847 LHSTy = LHSExp->getType(); 1848 1849 BaseExpr = LHSExp; 1850 IndexExpr = RHSExp; 1851 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1852 } else if (RHSTy->isArrayType()) { 1853 // Same as previous, except for 123[f().a] case 1854 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1855 RHSExp->getSourceRange(); 1856 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1857 RHSTy = RHSExp->getType(); 1858 1859 BaseExpr = RHSExp; 1860 IndexExpr = LHSExp; 1861 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1862 } else { 1863 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1864 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1865 } 1866 // C99 6.5.2.1p1 1867 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1868 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1869 << IndexExpr->getSourceRange()); 1870 1871 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1872 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1873 // type. Note that Functions are not objects, and that (in C99 parlance) 1874 // incomplete types are not object types. 1875 if (ResultType->isFunctionType()) { 1876 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1877 << ResultType << BaseExpr->getSourceRange(); 1878 return ExprError(); 1879 } 1880 1881 if (!ResultType->isDependentType() && 1882 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1883 BaseExpr->getSourceRange())) 1884 return ExprError(); 1885 1886 // Diagnose bad cases where we step over interface counts. 1887 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1888 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1889 << ResultType << BaseExpr->getSourceRange(); 1890 return ExprError(); 1891 } 1892 1893 Base.release(); 1894 Idx.release(); 1895 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1896 ResultType, RLoc)); 1897} 1898 1899QualType Sema:: 1900CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1901 IdentifierInfo &CompName, SourceLocation CompLoc) { 1902 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1903 1904 // The vector accessor can't exceed the number of elements. 1905 const char *compStr = CompName.getName(); 1906 1907 // This flag determines whether or not the component is one of the four 1908 // special names that indicate a subset of exactly half the elements are 1909 // to be selected. 1910 bool HalvingSwizzle = false; 1911 1912 // This flag determines whether or not CompName has an 's' char prefix, 1913 // indicating that it is a string of hex values to be used as vector indices. 1914 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1915 1916 // Check that we've found one of the special components, or that the component 1917 // names must come from the same set. 1918 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1919 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1920 HalvingSwizzle = true; 1921 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1922 do 1923 compStr++; 1924 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1925 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1926 do 1927 compStr++; 1928 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1929 } 1930 1931 if (!HalvingSwizzle && *compStr) { 1932 // We didn't get to the end of the string. This means the component names 1933 // didn't come from the same set *or* we encountered an illegal name. 1934 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1935 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1936 return QualType(); 1937 } 1938 1939 // Ensure no component accessor exceeds the width of the vector type it 1940 // operates on. 1941 if (!HalvingSwizzle) { 1942 compStr = CompName.getName(); 1943 1944 if (HexSwizzle) 1945 compStr++; 1946 1947 while (*compStr) { 1948 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1949 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1950 << baseType << SourceRange(CompLoc); 1951 return QualType(); 1952 } 1953 } 1954 } 1955 1956 // If this is a halving swizzle, verify that the base type has an even 1957 // number of elements. 1958 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1959 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1960 << baseType << SourceRange(CompLoc); 1961 return QualType(); 1962 } 1963 1964 // The component accessor looks fine - now we need to compute the actual type. 1965 // The vector type is implied by the component accessor. For example, 1966 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1967 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1968 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1969 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1970 : CompName.getLength(); 1971 if (HexSwizzle) 1972 CompSize--; 1973 1974 if (CompSize == 1) 1975 return vecType->getElementType(); 1976 1977 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1978 // Now look up the TypeDefDecl from the vector type. Without this, 1979 // diagostics look bad. We want extended vector types to appear built-in. 1980 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1981 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1982 return Context.getTypedefType(ExtVectorDecls[i]); 1983 } 1984 return VT; // should never get here (a typedef type should always be found). 1985} 1986 1987static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1988 IdentifierInfo &Member, 1989 const Selector &Sel, 1990 ASTContext &Context) { 1991
| 1329 1330 } else if (!Literal.isIntegerLiteral()) { 1331 return ExprError(); 1332 } else { 1333 QualType Ty; 1334 1335 // long long is a C99 feature. 1336 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1337 Literal.isLongLong) 1338 Diag(Tok.getLocation(), diag::ext_longlong); 1339 1340 // Get the value in the widest-possible width. 1341 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1342 1343 if (Literal.GetIntegerValue(ResultVal)) { 1344 // If this value didn't fit into uintmax_t, warn and force to ull. 1345 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1346 Ty = Context.UnsignedLongLongTy; 1347 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1348 "long long is not intmax_t?"); 1349 } else { 1350 // If this value fits into a ULL, try to figure out what else it fits into 1351 // according to the rules of C99 6.4.4.1p5. 1352 1353 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1354 // be an unsigned int. 1355 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1356 1357 // Check from smallest to largest, picking the smallest type we can. 1358 unsigned Width = 0; 1359 if (!Literal.isLong && !Literal.isLongLong) { 1360 // Are int/unsigned possibilities? 1361 unsigned IntSize = Context.Target.getIntWidth(); 1362 1363 // Does it fit in a unsigned int? 1364 if (ResultVal.isIntN(IntSize)) { 1365 // Does it fit in a signed int? 1366 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1367 Ty = Context.IntTy; 1368 else if (AllowUnsigned) 1369 Ty = Context.UnsignedIntTy; 1370 Width = IntSize; 1371 } 1372 } 1373 1374 // Are long/unsigned long possibilities? 1375 if (Ty.isNull() && !Literal.isLongLong) { 1376 unsigned LongSize = Context.Target.getLongWidth(); 1377 1378 // Does it fit in a unsigned long? 1379 if (ResultVal.isIntN(LongSize)) { 1380 // Does it fit in a signed long? 1381 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1382 Ty = Context.LongTy; 1383 else if (AllowUnsigned) 1384 Ty = Context.UnsignedLongTy; 1385 Width = LongSize; 1386 } 1387 } 1388 1389 // Finally, check long long if needed. 1390 if (Ty.isNull()) { 1391 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1392 1393 // Does it fit in a unsigned long long? 1394 if (ResultVal.isIntN(LongLongSize)) { 1395 // Does it fit in a signed long long? 1396 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1397 Ty = Context.LongLongTy; 1398 else if (AllowUnsigned) 1399 Ty = Context.UnsignedLongLongTy; 1400 Width = LongLongSize; 1401 } 1402 } 1403 1404 // If we still couldn't decide a type, we probably have something that 1405 // does not fit in a signed long long, but has no U suffix. 1406 if (Ty.isNull()) { 1407 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1408 Ty = Context.UnsignedLongLongTy; 1409 Width = Context.Target.getLongLongWidth(); 1410 } 1411 1412 if (ResultVal.getBitWidth() != Width) 1413 ResultVal.trunc(Width); 1414 } 1415 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1416 } 1417 1418 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1419 if (Literal.isImaginary) 1420 Res = new (Context) ImaginaryLiteral(Res, 1421 Context.getComplexType(Res->getType())); 1422 1423 return Owned(Res); 1424} 1425 1426Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1427 SourceLocation R, ExprArg Val) { 1428 Expr *E = Val.takeAs<Expr>(); 1429 assert((E != 0) && "ActOnParenExpr() missing expr"); 1430 return Owned(new (Context) ParenExpr(L, R, E)); 1431} 1432 1433/// The UsualUnaryConversions() function is *not* called by this routine. 1434/// See C99 6.3.2.1p[2-4] for more details. 1435bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1436 SourceLocation OpLoc, 1437 const SourceRange &ExprRange, 1438 bool isSizeof) { 1439 if (exprType->isDependentType()) 1440 return false; 1441 1442 // C99 6.5.3.4p1: 1443 if (isa<FunctionType>(exprType)) { 1444 // alignof(function) is allowed as an extension. 1445 if (isSizeof) 1446 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1447 return false; 1448 } 1449 1450 // Allow sizeof(void)/alignof(void) as an extension. 1451 if (exprType->isVoidType()) { 1452 Diag(OpLoc, diag::ext_sizeof_void_type) 1453 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1454 return false; 1455 } 1456 1457 if (RequireCompleteType(OpLoc, exprType, 1458 isSizeof ? diag::err_sizeof_incomplete_type : 1459 diag::err_alignof_incomplete_type, 1460 ExprRange)) 1461 return true; 1462 1463 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1464 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1465 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1466 << exprType << isSizeof << ExprRange; 1467 return true; 1468 } 1469 1470 return false; 1471} 1472 1473bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1474 const SourceRange &ExprRange) { 1475 E = E->IgnoreParens(); 1476 1477 // alignof decl is always ok. 1478 if (isa<DeclRefExpr>(E)) 1479 return false; 1480 1481 // Cannot know anything else if the expression is dependent. 1482 if (E->isTypeDependent()) 1483 return false; 1484 1485 if (E->getBitField()) { 1486 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1487 return true; 1488 } 1489 1490 // Alignment of a field access is always okay, so long as it isn't a 1491 // bit-field. 1492 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1493 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1494 return false; 1495 1496 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1497} 1498 1499/// \brief Build a sizeof or alignof expression given a type operand. 1500Action::OwningExprResult 1501Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1502 bool isSizeOf, SourceRange R) { 1503 if (T.isNull()) 1504 return ExprError(); 1505 1506 if (!T->isDependentType() && 1507 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1508 return ExprError(); 1509 1510 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1511 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1512 Context.getSizeType(), OpLoc, 1513 R.getEnd())); 1514} 1515 1516/// \brief Build a sizeof or alignof expression given an expression 1517/// operand. 1518Action::OwningExprResult 1519Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1520 bool isSizeOf, SourceRange R) { 1521 // Verify that the operand is valid. 1522 bool isInvalid = false; 1523 if (E->isTypeDependent()) { 1524 // Delay type-checking for type-dependent expressions. 1525 } else if (!isSizeOf) { 1526 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1527 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1528 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1529 isInvalid = true; 1530 } else { 1531 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1532 } 1533 1534 if (isInvalid) 1535 return ExprError(); 1536 1537 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1538 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1539 Context.getSizeType(), OpLoc, 1540 R.getEnd())); 1541} 1542 1543/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1544/// the same for @c alignof and @c __alignof 1545/// Note that the ArgRange is invalid if isType is false. 1546Action::OwningExprResult 1547Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1548 void *TyOrEx, const SourceRange &ArgRange) { 1549 // If error parsing type, ignore. 1550 if (TyOrEx == 0) return ExprError(); 1551 1552 if (isType) { 1553 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1554 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1555 } 1556 1557 // Get the end location. 1558 Expr *ArgEx = (Expr *)TyOrEx; 1559 Action::OwningExprResult Result 1560 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1561 1562 if (Result.isInvalid()) 1563 DeleteExpr(ArgEx); 1564 1565 return move(Result); 1566} 1567 1568QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1569 if (V->isTypeDependent()) 1570 return Context.DependentTy; 1571 1572 // These operators return the element type of a complex type. 1573 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1574 return CT->getElementType(); 1575 1576 // Otherwise they pass through real integer and floating point types here. 1577 if (V->getType()->isArithmeticType()) 1578 return V->getType(); 1579 1580 // Reject anything else. 1581 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1582 << (isReal ? "__real" : "__imag"); 1583 return QualType(); 1584} 1585 1586 1587 1588Action::OwningExprResult 1589Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1590 tok::TokenKind Kind, ExprArg Input) { 1591 Expr *Arg = (Expr *)Input.get(); 1592 1593 UnaryOperator::Opcode Opc; 1594 switch (Kind) { 1595 default: assert(0 && "Unknown unary op!"); 1596 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1597 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1598 } 1599 1600 if (getLangOptions().CPlusPlus && 1601 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1602 // Which overloaded operator? 1603 OverloadedOperatorKind OverOp = 1604 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1605 1606 // C++ [over.inc]p1: 1607 // 1608 // [...] If the function is a member function with one 1609 // parameter (which shall be of type int) or a non-member 1610 // function with two parameters (the second of which shall be 1611 // of type int), it defines the postfix increment operator ++ 1612 // for objects of that type. When the postfix increment is 1613 // called as a result of using the ++ operator, the int 1614 // argument will have value zero. 1615 Expr *Args[2] = { 1616 Arg, 1617 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1618 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1619 }; 1620 1621 // Build the candidate set for overloading 1622 OverloadCandidateSet CandidateSet; 1623 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1624 1625 // Perform overload resolution. 1626 OverloadCandidateSet::iterator Best; 1627 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1628 case OR_Success: { 1629 // We found a built-in operator or an overloaded operator. 1630 FunctionDecl *FnDecl = Best->Function; 1631 1632 if (FnDecl) { 1633 // We matched an overloaded operator. Build a call to that 1634 // operator. 1635 1636 // Convert the arguments. 1637 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1638 if (PerformObjectArgumentInitialization(Arg, Method)) 1639 return ExprError(); 1640 } else { 1641 // Convert the arguments. 1642 if (PerformCopyInitialization(Arg, 1643 FnDecl->getParamDecl(0)->getType(), 1644 "passing")) 1645 return ExprError(); 1646 } 1647 1648 // Determine the result type 1649 QualType ResultTy 1650 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1651 ResultTy = ResultTy.getNonReferenceType(); 1652 1653 // Build the actual expression node. 1654 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1655 SourceLocation()); 1656 UsualUnaryConversions(FnExpr); 1657 1658 Input.release(); 1659 Args[0] = Arg; 1660 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1661 Args, 2, ResultTy, 1662 OpLoc)); 1663 } else { 1664 // We matched a built-in operator. Convert the arguments, then 1665 // break out so that we will build the appropriate built-in 1666 // operator node. 1667 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1668 "passing")) 1669 return ExprError(); 1670 1671 break; 1672 } 1673 } 1674 1675 case OR_No_Viable_Function: 1676 // No viable function; fall through to handling this as a 1677 // built-in operator, which will produce an error message for us. 1678 break; 1679 1680 case OR_Ambiguous: 1681 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1682 << UnaryOperator::getOpcodeStr(Opc) 1683 << Arg->getSourceRange(); 1684 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1685 return ExprError(); 1686 1687 case OR_Deleted: 1688 Diag(OpLoc, diag::err_ovl_deleted_oper) 1689 << Best->Function->isDeleted() 1690 << UnaryOperator::getOpcodeStr(Opc) 1691 << Arg->getSourceRange(); 1692 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1693 return ExprError(); 1694 } 1695 1696 // Either we found no viable overloaded operator or we matched a 1697 // built-in operator. In either case, fall through to trying to 1698 // build a built-in operation. 1699 } 1700 1701 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1702 Opc == UnaryOperator::PostInc); 1703 if (result.isNull()) 1704 return ExprError(); 1705 Input.release(); 1706 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1707} 1708 1709Action::OwningExprResult 1710Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1711 ExprArg Idx, SourceLocation RLoc) { 1712 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1713 *RHSExp = static_cast<Expr*>(Idx.get()); 1714 1715 if (getLangOptions().CPlusPlus && 1716 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1717 Base.release(); 1718 Idx.release(); 1719 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1720 Context.DependentTy, RLoc)); 1721 } 1722 1723 if (getLangOptions().CPlusPlus && 1724 (LHSExp->getType()->isRecordType() || 1725 LHSExp->getType()->isEnumeralType() || 1726 RHSExp->getType()->isRecordType() || 1727 RHSExp->getType()->isEnumeralType())) { 1728 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1729 // to the candidate set. 1730 OverloadCandidateSet CandidateSet; 1731 Expr *Args[2] = { LHSExp, RHSExp }; 1732 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1733 SourceRange(LLoc, RLoc)); 1734 1735 // Perform overload resolution. 1736 OverloadCandidateSet::iterator Best; 1737 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1738 case OR_Success: { 1739 // We found a built-in operator or an overloaded operator. 1740 FunctionDecl *FnDecl = Best->Function; 1741 1742 if (FnDecl) { 1743 // We matched an overloaded operator. Build a call to that 1744 // operator. 1745 1746 // Convert the arguments. 1747 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1748 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1749 PerformCopyInitialization(RHSExp, 1750 FnDecl->getParamDecl(0)->getType(), 1751 "passing")) 1752 return ExprError(); 1753 } else { 1754 // Convert the arguments. 1755 if (PerformCopyInitialization(LHSExp, 1756 FnDecl->getParamDecl(0)->getType(), 1757 "passing") || 1758 PerformCopyInitialization(RHSExp, 1759 FnDecl->getParamDecl(1)->getType(), 1760 "passing")) 1761 return ExprError(); 1762 } 1763 1764 // Determine the result type 1765 QualType ResultTy 1766 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1767 ResultTy = ResultTy.getNonReferenceType(); 1768 1769 // Build the actual expression node. 1770 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1771 SourceLocation()); 1772 UsualUnaryConversions(FnExpr); 1773 1774 Base.release(); 1775 Idx.release(); 1776 Args[0] = LHSExp; 1777 Args[1] = RHSExp; 1778 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1779 FnExpr, Args, 2, 1780 ResultTy, LLoc)); 1781 } else { 1782 // We matched a built-in operator. Convert the arguments, then 1783 // break out so that we will build the appropriate built-in 1784 // operator node. 1785 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1786 "passing") || 1787 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1788 "passing")) 1789 return ExprError(); 1790 1791 break; 1792 } 1793 } 1794 1795 case OR_No_Viable_Function: 1796 // No viable function; fall through to handling this as a 1797 // built-in operator, which will produce an error message for us. 1798 break; 1799 1800 case OR_Ambiguous: 1801 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1802 << "[]" 1803 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1804 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1805 return ExprError(); 1806 1807 case OR_Deleted: 1808 Diag(LLoc, diag::err_ovl_deleted_oper) 1809 << Best->Function->isDeleted() 1810 << "[]" 1811 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1812 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1813 return ExprError(); 1814 } 1815 1816 // Either we found no viable overloaded operator or we matched a 1817 // built-in operator. In either case, fall through to trying to 1818 // build a built-in operation. 1819 } 1820 1821 // Perform default conversions. 1822 DefaultFunctionArrayConversion(LHSExp); 1823 DefaultFunctionArrayConversion(RHSExp); 1824 1825 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1826 1827 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1828 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1829 // in the subscript position. As a result, we need to derive the array base 1830 // and index from the expression types. 1831 Expr *BaseExpr, *IndexExpr; 1832 QualType ResultType; 1833 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1834 BaseExpr = LHSExp; 1835 IndexExpr = RHSExp; 1836 ResultType = Context.DependentTy; 1837 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1838 BaseExpr = LHSExp; 1839 IndexExpr = RHSExp; 1840 ResultType = PTy->getPointeeType(); 1841 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1842 // Handle the uncommon case of "123[Ptr]". 1843 BaseExpr = RHSExp; 1844 IndexExpr = LHSExp; 1845 ResultType = PTy->getPointeeType(); 1846 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1847 BaseExpr = LHSExp; // vectors: V[123] 1848 IndexExpr = RHSExp; 1849 1850 // FIXME: need to deal with const... 1851 ResultType = VTy->getElementType(); 1852 } else if (LHSTy->isArrayType()) { 1853 // If we see an array that wasn't promoted by 1854 // DefaultFunctionArrayConversion, it must be an array that 1855 // wasn't promoted because of the C90 rule that doesn't 1856 // allow promoting non-lvalue arrays. Warn, then 1857 // force the promotion here. 1858 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1859 LHSExp->getSourceRange(); 1860 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1861 LHSTy = LHSExp->getType(); 1862 1863 BaseExpr = LHSExp; 1864 IndexExpr = RHSExp; 1865 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1866 } else if (RHSTy->isArrayType()) { 1867 // Same as previous, except for 123[f().a] case 1868 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1869 RHSExp->getSourceRange(); 1870 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1871 RHSTy = RHSExp->getType(); 1872 1873 BaseExpr = RHSExp; 1874 IndexExpr = LHSExp; 1875 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1876 } else { 1877 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1878 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1879 } 1880 // C99 6.5.2.1p1 1881 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1882 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1883 << IndexExpr->getSourceRange()); 1884 1885 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1886 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1887 // type. Note that Functions are not objects, and that (in C99 parlance) 1888 // incomplete types are not object types. 1889 if (ResultType->isFunctionType()) { 1890 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1891 << ResultType << BaseExpr->getSourceRange(); 1892 return ExprError(); 1893 } 1894 1895 if (!ResultType->isDependentType() && 1896 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1897 BaseExpr->getSourceRange())) 1898 return ExprError(); 1899 1900 // Diagnose bad cases where we step over interface counts. 1901 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1902 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1903 << ResultType << BaseExpr->getSourceRange(); 1904 return ExprError(); 1905 } 1906 1907 Base.release(); 1908 Idx.release(); 1909 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1910 ResultType, RLoc)); 1911} 1912 1913QualType Sema:: 1914CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1915 IdentifierInfo &CompName, SourceLocation CompLoc) { 1916 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1917 1918 // The vector accessor can't exceed the number of elements. 1919 const char *compStr = CompName.getName(); 1920 1921 // This flag determines whether or not the component is one of the four 1922 // special names that indicate a subset of exactly half the elements are 1923 // to be selected. 1924 bool HalvingSwizzle = false; 1925 1926 // This flag determines whether or not CompName has an 's' char prefix, 1927 // indicating that it is a string of hex values to be used as vector indices. 1928 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1929 1930 // Check that we've found one of the special components, or that the component 1931 // names must come from the same set. 1932 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1933 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1934 HalvingSwizzle = true; 1935 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1936 do 1937 compStr++; 1938 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1939 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1940 do 1941 compStr++; 1942 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1943 } 1944 1945 if (!HalvingSwizzle && *compStr) { 1946 // We didn't get to the end of the string. This means the component names 1947 // didn't come from the same set *or* we encountered an illegal name. 1948 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1949 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1950 return QualType(); 1951 } 1952 1953 // Ensure no component accessor exceeds the width of the vector type it 1954 // operates on. 1955 if (!HalvingSwizzle) { 1956 compStr = CompName.getName(); 1957 1958 if (HexSwizzle) 1959 compStr++; 1960 1961 while (*compStr) { 1962 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1963 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1964 << baseType << SourceRange(CompLoc); 1965 return QualType(); 1966 } 1967 } 1968 } 1969 1970 // If this is a halving swizzle, verify that the base type has an even 1971 // number of elements. 1972 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1973 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1974 << baseType << SourceRange(CompLoc); 1975 return QualType(); 1976 } 1977 1978 // The component accessor looks fine - now we need to compute the actual type. 1979 // The vector type is implied by the component accessor. For example, 1980 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1981 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1982 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1983 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1984 : CompName.getLength(); 1985 if (HexSwizzle) 1986 CompSize--; 1987 1988 if (CompSize == 1) 1989 return vecType->getElementType(); 1990 1991 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1992 // Now look up the TypeDefDecl from the vector type. Without this, 1993 // diagostics look bad. We want extended vector types to appear built-in. 1994 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1995 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1996 return Context.getTypedefType(ExtVectorDecls[i]); 1997 } 1998 return VT; // should never get here (a typedef type should always be found). 1999} 2000 2001static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 2002 IdentifierInfo &Member, 2003 const Selector &Sel, 2004 ASTContext &Context) { 2005
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1992 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member))
| 2006 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member))
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1993 return PD;
| 2007 return PD;
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1994 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel))
| 2008 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
|
1995 return OMD; 1996 1997 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1998 E = PDecl->protocol_end(); I != E; ++I) { 1999 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 2000 Context)) 2001 return D; 2002 } 2003 return 0; 2004} 2005 2006static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 2007 IdentifierInfo &Member, 2008 const Selector &Sel, 2009 ASTContext &Context) { 2010 // Check protocols on qualified interfaces. 2011 Decl *GDecl = 0; 2012 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2013 E = QIdTy->qual_end(); I != E; ++I) {
| 2009 return OMD; 2010 2011 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 2012 E = PDecl->protocol_end(); I != E; ++I) { 2013 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 2014 Context)) 2015 return D; 2016 } 2017 return 0; 2018} 2019 2020static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 2021 IdentifierInfo &Member, 2022 const Selector &Sel, 2023 ASTContext &Context) { 2024 // Check protocols on qualified interfaces. 2025 Decl *GDecl = 0; 2026 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2027 E = QIdTy->qual_end(); I != E; ++I) {
|
2014 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) {
| 2028 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) {
|
2015 GDecl = PD; 2016 break; 2017 } 2018 // Also must look for a getter name which uses property syntax.
| 2029 GDecl = PD; 2030 break; 2031 } 2032 // Also must look for a getter name which uses property syntax.
|
2019 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) {
| 2033 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) {
|
2020 GDecl = OMD; 2021 break; 2022 } 2023 } 2024 if (!GDecl) { 2025 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2026 E = QIdTy->qual_end(); I != E; ++I) { 2027 // Search in the protocol-qualifier list of current protocol. 2028 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2029 if (GDecl) 2030 return GDecl; 2031 } 2032 } 2033 return GDecl; 2034} 2035 2036/// FindMethodInNestedImplementations - Look up a method in current and 2037/// all base class implementations. 2038/// 2039ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2040 const ObjCInterfaceDecl *IFace, 2041 const Selector &Sel) { 2042 ObjCMethodDecl *Method = 0; 2043 if (ObjCImplementationDecl *ImpDecl 2044 = LookupObjCImplementation(IFace->getIdentifier()))
| 2034 GDecl = OMD; 2035 break; 2036 } 2037 } 2038 if (!GDecl) { 2039 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2040 E = QIdTy->qual_end(); I != E; ++I) { 2041 // Search in the protocol-qualifier list of current protocol. 2042 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2043 if (GDecl) 2044 return GDecl; 2045 } 2046 } 2047 return GDecl; 2048} 2049 2050/// FindMethodInNestedImplementations - Look up a method in current and 2051/// all base class implementations. 2052/// 2053ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2054 const ObjCInterfaceDecl *IFace, 2055 const Selector &Sel) { 2056 ObjCMethodDecl *Method = 0; 2057 if (ObjCImplementationDecl *ImpDecl 2058 = LookupObjCImplementation(IFace->getIdentifier()))
|
2045 Method = ImpDecl->getInstanceMethod(Context, Sel);
| 2059 Method = ImpDecl->getInstanceMethod(Sel);
|
2046 2047 if (!Method && IFace->getSuperClass()) 2048 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2049 return Method; 2050} 2051 2052Action::OwningExprResult 2053Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2054 tok::TokenKind OpKind, SourceLocation MemberLoc, 2055 IdentifierInfo &Member, 2056 DeclPtrTy ObjCImpDecl) { 2057 Expr *BaseExpr = Base.takeAs<Expr>(); 2058 assert(BaseExpr && "no record expression"); 2059 2060 // Perform default conversions. 2061 DefaultFunctionArrayConversion(BaseExpr); 2062 2063 QualType BaseType = BaseExpr->getType(); 2064 assert(!BaseType.isNull() && "no type for member expression"); 2065 2066 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2067 // must have pointer type, and the accessed type is the pointee. 2068 if (OpKind == tok::arrow) { 2069 if (BaseType->isDependentType()) 2070 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2071 BaseExpr, true, 2072 OpLoc, 2073 DeclarationName(&Member), 2074 MemberLoc)); 2075 else if (const PointerType *PT = BaseType->getAsPointerType()) 2076 BaseType = PT->getPointeeType(); 2077 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2078 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2079 MemberLoc, Member)); 2080 else 2081 return ExprError(Diag(MemberLoc, 2082 diag::err_typecheck_member_reference_arrow) 2083 << BaseType << BaseExpr->getSourceRange()); 2084 } else { 2085 if (BaseType->isDependentType()) { 2086 // Require that the base type isn't a pointer type 2087 // (so we'll report an error for) 2088 // T* t; 2089 // t.f; 2090 // 2091 // In Obj-C++, however, the above expression is valid, since it could be 2092 // accessing the 'f' property if T is an Obj-C interface. The extra check 2093 // allows this, while still reporting an error if T is a struct pointer. 2094 const PointerType *PT = BaseType->getAsPointerType(); 2095 2096 if (!PT || (getLangOptions().ObjC1 && 2097 !PT->getPointeeType()->isRecordType())) 2098 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2099 BaseExpr, false, 2100 OpLoc, 2101 DeclarationName(&Member), 2102 MemberLoc)); 2103 } 2104 } 2105 2106 // Handle field access to simple records. This also handles access to fields 2107 // of the ObjC 'id' struct. 2108 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2109 RecordDecl *RDecl = RTy->getDecl(); 2110 if (RequireCompleteType(OpLoc, BaseType, 2111 diag::err_typecheck_incomplete_tag, 2112 BaseExpr->getSourceRange())) 2113 return ExprError(); 2114 2115 // The record definition is complete, now make sure the member is valid. 2116 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2117 LookupResult Result 2118 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2119 LookupMemberName, false); 2120 2121 if (!Result) 2122 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2123 << &Member << BaseExpr->getSourceRange()); 2124 if (Result.isAmbiguous()) { 2125 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2126 MemberLoc, BaseExpr->getSourceRange()); 2127 return ExprError(); 2128 } 2129 2130 NamedDecl *MemberDecl = Result; 2131 2132 // If the decl being referenced had an error, return an error for this 2133 // sub-expr without emitting another error, in order to avoid cascading 2134 // error cases. 2135 if (MemberDecl->isInvalidDecl()) 2136 return ExprError(); 2137 2138 // Check the use of this field 2139 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2140 return ExprError(); 2141 2142 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2143 // We may have found a field within an anonymous union or struct 2144 // (C++ [class.union]). 2145 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2146 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2147 BaseExpr, OpLoc); 2148 2149 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2150 // FIXME: Handle address space modifiers 2151 QualType MemberType = FD->getType(); 2152 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2153 MemberType = Ref->getPointeeType(); 2154 else { 2155 unsigned combinedQualifiers = 2156 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2157 if (FD->isMutable()) 2158 combinedQualifiers &= ~QualType::Const; 2159 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2160 } 2161 2162 MarkDeclarationReferenced(MemberLoc, FD); 2163 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2164 MemberLoc, MemberType)); 2165 } 2166 2167 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2168 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2169 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2170 Var, MemberLoc, 2171 Var->getType().getNonReferenceType())); 2172 } 2173 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2174 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2175 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2176 MemberFn, MemberLoc, 2177 MemberFn->getType())); 2178 } 2179 if (OverloadedFunctionDecl *Ovl 2180 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2181 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2182 MemberLoc, Context.OverloadTy)); 2183 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2184 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2185 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2186 Enum, MemberLoc, Enum->getType())); 2187 } 2188 if (isa<TypeDecl>(MemberDecl)) 2189 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2190 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2191 2192 // We found a declaration kind that we didn't expect. This is a 2193 // generic error message that tells the user that she can't refer 2194 // to this member with '.' or '->'. 2195 return ExprError(Diag(MemberLoc, 2196 diag::err_typecheck_member_reference_unknown) 2197 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2198 } 2199 2200 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2201 // (*Obj).ivar. 2202 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2203 ObjCInterfaceDecl *ClassDeclared;
| 2060 2061 if (!Method && IFace->getSuperClass()) 2062 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2063 return Method; 2064} 2065 2066Action::OwningExprResult 2067Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2068 tok::TokenKind OpKind, SourceLocation MemberLoc, 2069 IdentifierInfo &Member, 2070 DeclPtrTy ObjCImpDecl) { 2071 Expr *BaseExpr = Base.takeAs<Expr>(); 2072 assert(BaseExpr && "no record expression"); 2073 2074 // Perform default conversions. 2075 DefaultFunctionArrayConversion(BaseExpr); 2076 2077 QualType BaseType = BaseExpr->getType(); 2078 assert(!BaseType.isNull() && "no type for member expression"); 2079 2080 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2081 // must have pointer type, and the accessed type is the pointee. 2082 if (OpKind == tok::arrow) { 2083 if (BaseType->isDependentType()) 2084 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2085 BaseExpr, true, 2086 OpLoc, 2087 DeclarationName(&Member), 2088 MemberLoc)); 2089 else if (const PointerType *PT = BaseType->getAsPointerType()) 2090 BaseType = PT->getPointeeType(); 2091 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2092 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2093 MemberLoc, Member)); 2094 else 2095 return ExprError(Diag(MemberLoc, 2096 diag::err_typecheck_member_reference_arrow) 2097 << BaseType << BaseExpr->getSourceRange()); 2098 } else { 2099 if (BaseType->isDependentType()) { 2100 // Require that the base type isn't a pointer type 2101 // (so we'll report an error for) 2102 // T* t; 2103 // t.f; 2104 // 2105 // In Obj-C++, however, the above expression is valid, since it could be 2106 // accessing the 'f' property if T is an Obj-C interface. The extra check 2107 // allows this, while still reporting an error if T is a struct pointer. 2108 const PointerType *PT = BaseType->getAsPointerType(); 2109 2110 if (!PT || (getLangOptions().ObjC1 && 2111 !PT->getPointeeType()->isRecordType())) 2112 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2113 BaseExpr, false, 2114 OpLoc, 2115 DeclarationName(&Member), 2116 MemberLoc)); 2117 } 2118 } 2119 2120 // Handle field access to simple records. This also handles access to fields 2121 // of the ObjC 'id' struct. 2122 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2123 RecordDecl *RDecl = RTy->getDecl(); 2124 if (RequireCompleteType(OpLoc, BaseType, 2125 diag::err_typecheck_incomplete_tag, 2126 BaseExpr->getSourceRange())) 2127 return ExprError(); 2128 2129 // The record definition is complete, now make sure the member is valid. 2130 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2131 LookupResult Result 2132 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2133 LookupMemberName, false); 2134 2135 if (!Result) 2136 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2137 << &Member << BaseExpr->getSourceRange()); 2138 if (Result.isAmbiguous()) { 2139 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2140 MemberLoc, BaseExpr->getSourceRange()); 2141 return ExprError(); 2142 } 2143 2144 NamedDecl *MemberDecl = Result; 2145 2146 // If the decl being referenced had an error, return an error for this 2147 // sub-expr without emitting another error, in order to avoid cascading 2148 // error cases. 2149 if (MemberDecl->isInvalidDecl()) 2150 return ExprError(); 2151 2152 // Check the use of this field 2153 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2154 return ExprError(); 2155 2156 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2157 // We may have found a field within an anonymous union or struct 2158 // (C++ [class.union]). 2159 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2160 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2161 BaseExpr, OpLoc); 2162 2163 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2164 // FIXME: Handle address space modifiers 2165 QualType MemberType = FD->getType(); 2166 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2167 MemberType = Ref->getPointeeType(); 2168 else { 2169 unsigned combinedQualifiers = 2170 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2171 if (FD->isMutable()) 2172 combinedQualifiers &= ~QualType::Const; 2173 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2174 } 2175 2176 MarkDeclarationReferenced(MemberLoc, FD); 2177 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2178 MemberLoc, MemberType)); 2179 } 2180 2181 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2182 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2183 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2184 Var, MemberLoc, 2185 Var->getType().getNonReferenceType())); 2186 } 2187 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2188 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2189 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2190 MemberFn, MemberLoc, 2191 MemberFn->getType())); 2192 } 2193 if (OverloadedFunctionDecl *Ovl 2194 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2195 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2196 MemberLoc, Context.OverloadTy)); 2197 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2198 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2199 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2200 Enum, MemberLoc, Enum->getType())); 2201 } 2202 if (isa<TypeDecl>(MemberDecl)) 2203 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2204 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2205 2206 // We found a declaration kind that we didn't expect. This is a 2207 // generic error message that tells the user that she can't refer 2208 // to this member with '.' or '->'. 2209 return ExprError(Diag(MemberLoc, 2210 diag::err_typecheck_member_reference_unknown) 2211 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2212 } 2213 2214 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2215 // (*Obj).ivar. 2216 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2217 ObjCInterfaceDecl *ClassDeclared;
|
2204 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 2205 &Member,
| 2218 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member,
|
2206 ClassDeclared)) { 2207 // If the decl being referenced had an error, return an error for this 2208 // sub-expr without emitting another error, in order to avoid cascading 2209 // error cases. 2210 if (IV->isInvalidDecl()) 2211 return ExprError(); 2212 2213 // Check whether we can reference this field. 2214 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2215 return ExprError(); 2216 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2217 IV->getAccessControl() != ObjCIvarDecl::Package) { 2218 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2219 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2220 ClassOfMethodDecl = MD->getClassInterface(); 2221 else if (ObjCImpDecl && getCurFunctionDecl()) { 2222 // Case of a c-function declared inside an objc implementation. 2223 // FIXME: For a c-style function nested inside an objc implementation 2224 // class, there is no implementation context available, so we pass 2225 // down the context as argument to this routine. Ideally, this context 2226 // need be passed down in the AST node and somehow calculated from the 2227 // AST for a function decl. 2228 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2229 if (ObjCImplementationDecl *IMPD = 2230 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2231 ClassOfMethodDecl = IMPD->getClassInterface(); 2232 else if (ObjCCategoryImplDecl* CatImplClass = 2233 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2234 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2235 } 2236 2237 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2238 if (ClassDeclared != IFTy->getDecl() || 2239 ClassOfMethodDecl != ClassDeclared) 2240 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2241 } 2242 // @protected 2243 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2244 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2245 } 2246 2247 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2248 MemberLoc, BaseExpr, 2249 OpKind == tok::arrow)); 2250 } 2251 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2252 << IFTy->getDecl()->getDeclName() << &Member 2253 << BaseExpr->getSourceRange()); 2254 } 2255 2256 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2257 // pointer to a (potentially qualified) interface type. 2258 const PointerType *PTy; 2259 const ObjCInterfaceType *IFTy; 2260 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2261 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2262 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2263 2264 // Search for a declared property first.
| 2219 ClassDeclared)) { 2220 // If the decl being referenced had an error, return an error for this 2221 // sub-expr without emitting another error, in order to avoid cascading 2222 // error cases. 2223 if (IV->isInvalidDecl()) 2224 return ExprError(); 2225 2226 // Check whether we can reference this field. 2227 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2228 return ExprError(); 2229 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2230 IV->getAccessControl() != ObjCIvarDecl::Package) { 2231 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2232 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2233 ClassOfMethodDecl = MD->getClassInterface(); 2234 else if (ObjCImpDecl && getCurFunctionDecl()) { 2235 // Case of a c-function declared inside an objc implementation. 2236 // FIXME: For a c-style function nested inside an objc implementation 2237 // class, there is no implementation context available, so we pass 2238 // down the context as argument to this routine. Ideally, this context 2239 // need be passed down in the AST node and somehow calculated from the 2240 // AST for a function decl. 2241 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2242 if (ObjCImplementationDecl *IMPD = 2243 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2244 ClassOfMethodDecl = IMPD->getClassInterface(); 2245 else if (ObjCCategoryImplDecl* CatImplClass = 2246 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2247 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2248 } 2249 2250 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2251 if (ClassDeclared != IFTy->getDecl() || 2252 ClassOfMethodDecl != ClassDeclared) 2253 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2254 } 2255 // @protected 2256 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2257 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2258 } 2259 2260 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2261 MemberLoc, BaseExpr, 2262 OpKind == tok::arrow)); 2263 } 2264 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2265 << IFTy->getDecl()->getDeclName() << &Member 2266 << BaseExpr->getSourceRange()); 2267 } 2268 2269 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2270 // pointer to a (potentially qualified) interface type. 2271 const PointerType *PTy; 2272 const ObjCInterfaceType *IFTy; 2273 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2274 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2275 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2276 2277 // Search for a declared property first.
|
2265 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2266 &Member)) {
| 2278 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) {
|
2267 // Check whether we can reference this property. 2268 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2269 return ExprError(); 2270 QualType ResTy = PD->getType(); 2271 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
| 2279 // Check whether we can reference this property. 2280 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2281 return ExprError(); 2282 QualType ResTy = PD->getType(); 2283 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
|
2272 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel);
| 2284 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
|
2273 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2274 ResTy = Getter->getResultType(); 2275 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2276 MemberLoc, BaseExpr)); 2277 } 2278 2279 // Check protocols on qualified interfaces. 2280 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2281 E = IFTy->qual_end(); I != E; ++I)
| 2285 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2286 ResTy = Getter->getResultType(); 2287 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2288 MemberLoc, BaseExpr)); 2289 } 2290 2291 // Check protocols on qualified interfaces. 2292 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2293 E = IFTy->qual_end(); I != E; ++I)
|
2282 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2283 &Member)) {
| 2294 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) {
|
2284 // Check whether we can reference this property. 2285 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2286 return ExprError(); 2287 2288 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2289 MemberLoc, BaseExpr)); 2290 } 2291 2292 // If that failed, look for an "implicit" property by seeing if the nullary 2293 // selector is implemented. 2294 2295 // FIXME: The logic for looking up nullary and unary selectors should be 2296 // shared with the code in ActOnInstanceMessage. 2297 2298 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
| 2295 // Check whether we can reference this property. 2296 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2297 return ExprError(); 2298 2299 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2300 MemberLoc, BaseExpr)); 2301 } 2302 2303 // If that failed, look for an "implicit" property by seeing if the nullary 2304 // selector is implemented. 2305 2306 // FIXME: The logic for looking up nullary and unary selectors should be 2307 // shared with the code in ActOnInstanceMessage. 2308 2309 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
|
2299 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel);
| 2310 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
|
2300 2301 // If this reference is in an @implementation, check for 'private' methods. 2302 if (!Getter) 2303 Getter = FindMethodInNestedImplementations(IFace, Sel); 2304 2305 // Look through local category implementations associated with the class. 2306 if (!Getter) { 2307 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2308 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
| 2311 2312 // If this reference is in an @implementation, check for 'private' methods. 2313 if (!Getter) 2314 Getter = FindMethodInNestedImplementations(IFace, Sel); 2315 2316 // Look through local category implementations associated with the class. 2317 if (!Getter) { 2318 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2319 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
|
2309 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel);
| 2320 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel);
|
2310 } 2311 } 2312 if (Getter) { 2313 // Check if we can reference this property. 2314 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2315 return ExprError(); 2316 } 2317 // If we found a getter then this may be a valid dot-reference, we 2318 // will look for the matching setter, in case it is needed. 2319 Selector SetterSel = 2320 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2321 PP.getSelectorTable(), &Member);
| 2321 } 2322 } 2323 if (Getter) { 2324 // Check if we can reference this property. 2325 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2326 return ExprError(); 2327 } 2328 // If we found a getter then this may be a valid dot-reference, we 2329 // will look for the matching setter, in case it is needed. 2330 Selector SetterSel = 2331 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2332 PP.getSelectorTable(), &Member);
|
2322 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel);
| 2333 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
|
2323 if (!Setter) { 2324 // If this reference is in an @implementation, also check for 'private' 2325 // methods. 2326 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2327 } 2328 // Look through local category implementations associated with the class. 2329 if (!Setter) { 2330 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2331 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
| 2334 if (!Setter) { 2335 // If this reference is in an @implementation, also check for 'private' 2336 // methods. 2337 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2338 } 2339 // Look through local category implementations associated with the class. 2340 if (!Setter) { 2341 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2342 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
|
2332 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel);
| 2343 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel);
|
2333 } 2334 } 2335 2336 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2337 return ExprError(); 2338 2339 if (Getter || Setter) { 2340 QualType PType; 2341 2342 if (Getter) 2343 PType = Getter->getResultType(); 2344 else { 2345 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2346 E = Setter->param_end(); PI != E; ++PI) 2347 PType = (*PI)->getType(); 2348 } 2349 // FIXME: we must check that the setter has property type. 2350 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2351 Setter, MemberLoc, BaseExpr)); 2352 } 2353 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2354 << &Member << BaseType); 2355 } 2356 // Handle properties on qualified "id" protocols. 2357 const ObjCObjectPointerType *QIdTy; 2358 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2359 // Check protocols on qualified interfaces. 2360 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2361 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2362 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2363 // Check the use of this declaration 2364 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2365 return ExprError(); 2366 2367 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2368 MemberLoc, BaseExpr)); 2369 } 2370 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2371 // Check the use of this method. 2372 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2373 return ExprError(); 2374 2375 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2376 OMD->getResultType(), 2377 OMD, OpLoc, MemberLoc, 2378 NULL, 0)); 2379 } 2380 } 2381 2382 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2383 << &Member << BaseType); 2384 } 2385 // Handle properties on ObjC 'Class' types. 2386 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2387 // Also must look for a getter name which uses property syntax. 2388 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2389 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2390 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2391 ObjCMethodDecl *Getter; 2392 // FIXME: need to also look locally in the implementation.
| 2344 } 2345 } 2346 2347 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2348 return ExprError(); 2349 2350 if (Getter || Setter) { 2351 QualType PType; 2352 2353 if (Getter) 2354 PType = Getter->getResultType(); 2355 else { 2356 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2357 E = Setter->param_end(); PI != E; ++PI) 2358 PType = (*PI)->getType(); 2359 } 2360 // FIXME: we must check that the setter has property type. 2361 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2362 Setter, MemberLoc, BaseExpr)); 2363 } 2364 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2365 << &Member << BaseType); 2366 } 2367 // Handle properties on qualified "id" protocols. 2368 const ObjCObjectPointerType *QIdTy; 2369 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2370 // Check protocols on qualified interfaces. 2371 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2372 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2373 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2374 // Check the use of this declaration 2375 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2376 return ExprError(); 2377 2378 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2379 MemberLoc, BaseExpr)); 2380 } 2381 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2382 // Check the use of this method. 2383 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2384 return ExprError(); 2385 2386 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2387 OMD->getResultType(), 2388 OMD, OpLoc, MemberLoc, 2389 NULL, 0)); 2390 } 2391 } 2392 2393 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2394 << &Member << BaseType); 2395 } 2396 // Handle properties on ObjC 'Class' types. 2397 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2398 // Also must look for a getter name which uses property syntax. 2399 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2400 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2401 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2402 ObjCMethodDecl *Getter; 2403 // FIXME: need to also look locally in the implementation.
|
2393 if ((Getter = IFace->lookupClassMethod(Context, Sel))) {
| 2404 if ((Getter = IFace->lookupClassMethod(Sel))) {
|
2394 // Check the use of this method. 2395 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2396 return ExprError(); 2397 } 2398 // If we found a getter then this may be a valid dot-reference, we 2399 // will look for the matching setter, in case it is needed. 2400 Selector SetterSel = 2401 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2402 PP.getSelectorTable(), &Member);
| 2405 // Check the use of this method. 2406 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2407 return ExprError(); 2408 } 2409 // If we found a getter then this may be a valid dot-reference, we 2410 // will look for the matching setter, in case it is needed. 2411 Selector SetterSel = 2412 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2413 PP.getSelectorTable(), &Member);
|
2403 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel);
| 2414 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
|
2404 if (!Setter) { 2405 // If this reference is in an @implementation, also check for 'private' 2406 // methods. 2407 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2408 } 2409 // Look through local category implementations associated with the class. 2410 if (!Setter) { 2411 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2412 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
| 2415 if (!Setter) { 2416 // If this reference is in an @implementation, also check for 'private' 2417 // methods. 2418 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2419 } 2420 // Look through local category implementations associated with the class. 2421 if (!Setter) { 2422 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2423 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
|
2413 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel);
| 2424 Setter = ObjCCategoryImpls[i]->getClassMethod(SetterSel);
|
2414 } 2415 } 2416 2417 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2418 return ExprError(); 2419 2420 if (Getter || Setter) { 2421 QualType PType; 2422 2423 if (Getter) 2424 PType = Getter->getResultType(); 2425 else { 2426 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2427 E = Setter->param_end(); PI != E; ++PI) 2428 PType = (*PI)->getType(); 2429 } 2430 // FIXME: we must check that the setter has property type. 2431 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2432 Setter, MemberLoc, BaseExpr)); 2433 } 2434 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2435 << &Member << BaseType); 2436 } 2437 } 2438 2439 // Handle 'field access' to vectors, such as 'V.xx'. 2440 if (BaseType->isExtVectorType()) { 2441 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2442 if (ret.isNull()) 2443 return ExprError(); 2444 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2445 MemberLoc)); 2446 } 2447 2448 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2449 << BaseType << BaseExpr->getSourceRange(); 2450 2451 // If the user is trying to apply -> or . to a function or function 2452 // pointer, it's probably because they forgot parentheses to call 2453 // the function. Suggest the addition of those parentheses. 2454 if (BaseType == Context.OverloadTy || 2455 BaseType->isFunctionType() || 2456 (BaseType->isPointerType() && 2457 BaseType->getAsPointerType()->isFunctionType())) { 2458 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2459 Diag(Loc, diag::note_member_reference_needs_call) 2460 << CodeModificationHint::CreateInsertion(Loc, "()"); 2461 } 2462 2463 return ExprError(); 2464} 2465 2466/// ConvertArgumentsForCall - Converts the arguments specified in 2467/// Args/NumArgs to the parameter types of the function FDecl with 2468/// function prototype Proto. Call is the call expression itself, and 2469/// Fn is the function expression. For a C++ member function, this 2470/// routine does not attempt to convert the object argument. Returns 2471/// true if the call is ill-formed. 2472bool 2473Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2474 FunctionDecl *FDecl, 2475 const FunctionProtoType *Proto, 2476 Expr **Args, unsigned NumArgs, 2477 SourceLocation RParenLoc) { 2478 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2479 // assignment, to the types of the corresponding parameter, ... 2480 unsigned NumArgsInProto = Proto->getNumArgs(); 2481 unsigned NumArgsToCheck = NumArgs; 2482 bool Invalid = false; 2483 2484 // If too few arguments are available (and we don't have default 2485 // arguments for the remaining parameters), don't make the call. 2486 if (NumArgs < NumArgsInProto) { 2487 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2488 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2489 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2490 // Use default arguments for missing arguments 2491 NumArgsToCheck = NumArgsInProto; 2492 Call->setNumArgs(Context, NumArgsInProto); 2493 } 2494 2495 // If too many are passed and not variadic, error on the extras and drop 2496 // them. 2497 if (NumArgs > NumArgsInProto) { 2498 if (!Proto->isVariadic()) { 2499 Diag(Args[NumArgsInProto]->getLocStart(), 2500 diag::err_typecheck_call_too_many_args) 2501 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2502 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2503 Args[NumArgs-1]->getLocEnd()); 2504 // This deletes the extra arguments. 2505 Call->setNumArgs(Context, NumArgsInProto); 2506 Invalid = true; 2507 } 2508 NumArgsToCheck = NumArgsInProto; 2509 } 2510 2511 // Continue to check argument types (even if we have too few/many args). 2512 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2513 QualType ProtoArgType = Proto->getArgType(i); 2514 2515 Expr *Arg; 2516 if (i < NumArgs) { 2517 Arg = Args[i]; 2518 2519 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2520 ProtoArgType, 2521 diag::err_call_incomplete_argument, 2522 Arg->getSourceRange())) 2523 return true; 2524 2525 // Pass the argument. 2526 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2527 return true; 2528 } else { 2529 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2530 Diag (Call->getSourceRange().getBegin(), 2531 diag::err_use_of_default_argument_to_function_declared_later) << 2532 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2533 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2534 diag::note_default_argument_declared_here); 2535 } else { 2536 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2537 2538 // If the default expression creates temporaries, we need to 2539 // push them to the current stack of expression temporaries so they'll 2540 // be properly destroyed. 2541 if (CXXExprWithTemporaries *E 2542 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2543 assert(!E->shouldDestroyTemporaries() && 2544 "Can't destroy temporaries in a default argument expr!"); 2545 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2546 ExprTemporaries.push_back(E->getTemporary(I)); 2547 } 2548 } 2549 2550 // We already type-checked the argument, so we know it works. 2551 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2552 } 2553 2554 QualType ArgType = Arg->getType(); 2555 2556 Call->setArg(i, Arg); 2557 } 2558 2559 // If this is a variadic call, handle args passed through "...". 2560 if (Proto->isVariadic()) { 2561 VariadicCallType CallType = VariadicFunction; 2562 if (Fn->getType()->isBlockPointerType()) 2563 CallType = VariadicBlock; // Block 2564 else if (isa<MemberExpr>(Fn)) 2565 CallType = VariadicMethod; 2566 2567 // Promote the arguments (C99 6.5.2.2p7). 2568 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2569 Expr *Arg = Args[i]; 2570 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2571 Call->setArg(i, Arg); 2572 } 2573 } 2574 2575 return Invalid; 2576} 2577 2578/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2579/// This provides the location of the left/right parens and a list of comma 2580/// locations. 2581Action::OwningExprResult 2582Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2583 MultiExprArg args, 2584 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2585 unsigned NumArgs = args.size(); 2586 Expr *Fn = fn.takeAs<Expr>(); 2587 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2588 assert(Fn && "no function call expression"); 2589 FunctionDecl *FDecl = NULL; 2590 NamedDecl *NDecl = NULL; 2591 DeclarationName UnqualifiedName; 2592 2593 if (getLangOptions().CPlusPlus) { 2594 // Determine whether this is a dependent call inside a C++ template, 2595 // in which case we won't do any semantic analysis now. 2596 // FIXME: Will need to cache the results of name lookup (including ADL) in 2597 // Fn. 2598 bool Dependent = false; 2599 if (Fn->isTypeDependent()) 2600 Dependent = true; 2601 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2602 Dependent = true; 2603 2604 if (Dependent) 2605 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2606 Context.DependentTy, RParenLoc)); 2607 2608 // Determine whether this is a call to an object (C++ [over.call.object]). 2609 if (Fn->getType()->isRecordType()) 2610 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2611 CommaLocs, RParenLoc)); 2612 2613 // Determine whether this is a call to a member function. 2614 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2615 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2616 if (isa<OverloadedFunctionDecl>(MemDecl) || 2617 isa<CXXMethodDecl>(MemDecl) || 2618 (isa<FunctionTemplateDecl>(MemDecl) && 2619 isa<CXXMethodDecl>( 2620 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2621 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2622 CommaLocs, RParenLoc)); 2623 } 2624 } 2625 2626 // If we're directly calling a function, get the appropriate declaration.
| 2425 } 2426 } 2427 2428 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2429 return ExprError(); 2430 2431 if (Getter || Setter) { 2432 QualType PType; 2433 2434 if (Getter) 2435 PType = Getter->getResultType(); 2436 else { 2437 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2438 E = Setter->param_end(); PI != E; ++PI) 2439 PType = (*PI)->getType(); 2440 } 2441 // FIXME: we must check that the setter has property type. 2442 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2443 Setter, MemberLoc, BaseExpr)); 2444 } 2445 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2446 << &Member << BaseType); 2447 } 2448 } 2449 2450 // Handle 'field access' to vectors, such as 'V.xx'. 2451 if (BaseType->isExtVectorType()) { 2452 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2453 if (ret.isNull()) 2454 return ExprError(); 2455 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2456 MemberLoc)); 2457 } 2458 2459 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2460 << BaseType << BaseExpr->getSourceRange(); 2461 2462 // If the user is trying to apply -> or . to a function or function 2463 // pointer, it's probably because they forgot parentheses to call 2464 // the function. Suggest the addition of those parentheses. 2465 if (BaseType == Context.OverloadTy || 2466 BaseType->isFunctionType() || 2467 (BaseType->isPointerType() && 2468 BaseType->getAsPointerType()->isFunctionType())) { 2469 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2470 Diag(Loc, diag::note_member_reference_needs_call) 2471 << CodeModificationHint::CreateInsertion(Loc, "()"); 2472 } 2473 2474 return ExprError(); 2475} 2476 2477/// ConvertArgumentsForCall - Converts the arguments specified in 2478/// Args/NumArgs to the parameter types of the function FDecl with 2479/// function prototype Proto. Call is the call expression itself, and 2480/// Fn is the function expression. For a C++ member function, this 2481/// routine does not attempt to convert the object argument. Returns 2482/// true if the call is ill-formed. 2483bool 2484Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2485 FunctionDecl *FDecl, 2486 const FunctionProtoType *Proto, 2487 Expr **Args, unsigned NumArgs, 2488 SourceLocation RParenLoc) { 2489 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2490 // assignment, to the types of the corresponding parameter, ... 2491 unsigned NumArgsInProto = Proto->getNumArgs(); 2492 unsigned NumArgsToCheck = NumArgs; 2493 bool Invalid = false; 2494 2495 // If too few arguments are available (and we don't have default 2496 // arguments for the remaining parameters), don't make the call. 2497 if (NumArgs < NumArgsInProto) { 2498 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2499 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2500 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2501 // Use default arguments for missing arguments 2502 NumArgsToCheck = NumArgsInProto; 2503 Call->setNumArgs(Context, NumArgsInProto); 2504 } 2505 2506 // If too many are passed and not variadic, error on the extras and drop 2507 // them. 2508 if (NumArgs > NumArgsInProto) { 2509 if (!Proto->isVariadic()) { 2510 Diag(Args[NumArgsInProto]->getLocStart(), 2511 diag::err_typecheck_call_too_many_args) 2512 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2513 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2514 Args[NumArgs-1]->getLocEnd()); 2515 // This deletes the extra arguments. 2516 Call->setNumArgs(Context, NumArgsInProto); 2517 Invalid = true; 2518 } 2519 NumArgsToCheck = NumArgsInProto; 2520 } 2521 2522 // Continue to check argument types (even if we have too few/many args). 2523 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2524 QualType ProtoArgType = Proto->getArgType(i); 2525 2526 Expr *Arg; 2527 if (i < NumArgs) { 2528 Arg = Args[i]; 2529 2530 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2531 ProtoArgType, 2532 diag::err_call_incomplete_argument, 2533 Arg->getSourceRange())) 2534 return true; 2535 2536 // Pass the argument. 2537 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2538 return true; 2539 } else { 2540 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2541 Diag (Call->getSourceRange().getBegin(), 2542 diag::err_use_of_default_argument_to_function_declared_later) << 2543 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2544 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2545 diag::note_default_argument_declared_here); 2546 } else { 2547 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2548 2549 // If the default expression creates temporaries, we need to 2550 // push them to the current stack of expression temporaries so they'll 2551 // be properly destroyed. 2552 if (CXXExprWithTemporaries *E 2553 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2554 assert(!E->shouldDestroyTemporaries() && 2555 "Can't destroy temporaries in a default argument expr!"); 2556 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2557 ExprTemporaries.push_back(E->getTemporary(I)); 2558 } 2559 } 2560 2561 // We already type-checked the argument, so we know it works. 2562 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2563 } 2564 2565 QualType ArgType = Arg->getType(); 2566 2567 Call->setArg(i, Arg); 2568 } 2569 2570 // If this is a variadic call, handle args passed through "...". 2571 if (Proto->isVariadic()) { 2572 VariadicCallType CallType = VariadicFunction; 2573 if (Fn->getType()->isBlockPointerType()) 2574 CallType = VariadicBlock; // Block 2575 else if (isa<MemberExpr>(Fn)) 2576 CallType = VariadicMethod; 2577 2578 // Promote the arguments (C99 6.5.2.2p7). 2579 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2580 Expr *Arg = Args[i]; 2581 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2582 Call->setArg(i, Arg); 2583 } 2584 } 2585 2586 return Invalid; 2587} 2588 2589/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2590/// This provides the location of the left/right parens and a list of comma 2591/// locations. 2592Action::OwningExprResult 2593Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2594 MultiExprArg args, 2595 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2596 unsigned NumArgs = args.size(); 2597 Expr *Fn = fn.takeAs<Expr>(); 2598 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2599 assert(Fn && "no function call expression"); 2600 FunctionDecl *FDecl = NULL; 2601 NamedDecl *NDecl = NULL; 2602 DeclarationName UnqualifiedName; 2603 2604 if (getLangOptions().CPlusPlus) { 2605 // Determine whether this is a dependent call inside a C++ template, 2606 // in which case we won't do any semantic analysis now. 2607 // FIXME: Will need to cache the results of name lookup (including ADL) in 2608 // Fn. 2609 bool Dependent = false; 2610 if (Fn->isTypeDependent()) 2611 Dependent = true; 2612 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2613 Dependent = true; 2614 2615 if (Dependent) 2616 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2617 Context.DependentTy, RParenLoc)); 2618 2619 // Determine whether this is a call to an object (C++ [over.call.object]). 2620 if (Fn->getType()->isRecordType()) 2621 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2622 CommaLocs, RParenLoc)); 2623 2624 // Determine whether this is a call to a member function. 2625 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2626 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2627 if (isa<OverloadedFunctionDecl>(MemDecl) || 2628 isa<CXXMethodDecl>(MemDecl) || 2629 (isa<FunctionTemplateDecl>(MemDecl) && 2630 isa<CXXMethodDecl>( 2631 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2632 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2633 CommaLocs, RParenLoc)); 2634 } 2635 } 2636 2637 // If we're directly calling a function, get the appropriate declaration.
|
2627 DeclRefExpr *DRExpr = NULL;
| 2638 // Also, in C++, keep track of whether we should perform argument-dependent 2639 // lookup and whether there were any explicitly-specified template arguments.
|
2628 Expr *FnExpr = Fn; 2629 bool ADL = true;
| 2640 Expr *FnExpr = Fn; 2641 bool ADL = true;
|
| 2642 bool HasExplicitTemplateArgs = 0; 2643 const TemplateArgument *ExplicitTemplateArgs = 0; 2644 unsigned NumExplicitTemplateArgs = 0;
|
2630 while (true) { 2631 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2632 FnExpr = IcExpr->getSubExpr(); 2633 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2634 // Parentheses around a function disable ADL 2635 // (C++0x [basic.lookup.argdep]p1). 2636 ADL = false; 2637 FnExpr = PExpr->getSubExpr(); 2638 } else if (isa<UnaryOperator>(FnExpr) && 2639 cast<UnaryOperator>(FnExpr)->getOpcode() 2640 == UnaryOperator::AddrOf) { 2641 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr();
| 2645 while (true) { 2646 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2647 FnExpr = IcExpr->getSubExpr(); 2648 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2649 // Parentheses around a function disable ADL 2650 // (C++0x [basic.lookup.argdep]p1). 2651 ADL = false; 2652 FnExpr = PExpr->getSubExpr(); 2653 } else if (isa<UnaryOperator>(FnExpr) && 2654 cast<UnaryOperator>(FnExpr)->getOpcode() 2655 == UnaryOperator::AddrOf) { 2656 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr();
|
2642 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) {
| 2657 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) {
|
2643 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2644 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr);
| 2658 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2659 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr);
|
| 2660 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl());
|
2645 break; 2646 } else if (UnresolvedFunctionNameExpr *DepName 2647 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2648 UnqualifiedName = DepName->getName(); 2649 break;
| 2661 break; 2662 } else if (UnresolvedFunctionNameExpr *DepName 2663 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2664 UnqualifiedName = DepName->getName(); 2665 break;
|
| 2666 } else if (TemplateIdRefExpr *TemplateIdRef 2667 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2668 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2669 HasExplicitTemplateArgs = true; 2670 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2671 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2672 2673 // C++ [temp.arg.explicit]p6: 2674 // [Note: For simple function names, argument dependent lookup (3.4.2) 2675 // applies even when the function name is not visible within the 2676 // scope of the call. This is because the call still has the syntactic 2677 // form of a function call (3.4.1). But when a function template with 2678 // explicit template arguments is used, the call does not have the 2679 // correct syntactic form unless there is a function template with 2680 // that name visible at the point of the call. If no such name is 2681 // visible, the call is not syntactically well-formed and 2682 // argument-dependent lookup does not apply. If some such name is 2683 // visible, argument dependent lookup applies and additional function 2684 // templates may be found in other namespaces. 2685 // 2686 // The summary of this paragraph is that, if we get to this point and the 2687 // template-id was not a qualified name, then argument-dependent lookup 2688 // is still possible. 2689 if (TemplateIdRef->getQualifier()) 2690 ADL = false; 2691 break;
|
2650 } else { 2651 // Any kind of name that does not refer to a declaration (or 2652 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2653 ADL = false; 2654 break; 2655 } 2656 } 2657 2658 OverloadedFunctionDecl *Ovl = 0; 2659 FunctionTemplateDecl *FunctionTemplate = 0;
| 2692 } else { 2693 // Any kind of name that does not refer to a declaration (or 2694 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2695 ADL = false; 2696 break; 2697 } 2698 } 2699 2700 OverloadedFunctionDecl *Ovl = 0; 2701 FunctionTemplateDecl *FunctionTemplate = 0;
|
2660 if (DRExpr) { 2661 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2662 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(DRExpr->getDecl())))
| 2702 if (NDecl) { 2703 FDecl = dyn_cast<FunctionDecl>(NDecl); 2704 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl)))
|
2663 FDecl = FunctionTemplate->getTemplatedDecl(); 2664 else
| 2705 FDecl = FunctionTemplate->getTemplatedDecl(); 2706 else
|
2665 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2666 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2667 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl());
| 2707 FDecl = dyn_cast<FunctionDecl>(NDecl); 2708 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl);
|
2668 } 2669 2670 if (Ovl || FunctionTemplate || 2671 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2672 // We don't perform ADL for implicit declarations of builtins. 2673 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2674 ADL = false; 2675 2676 // We don't perform ADL in C. 2677 if (!getLangOptions().CPlusPlus) 2678 ADL = false; 2679 2680 if (Ovl || FunctionTemplate || ADL) {
| 2709 } 2710 2711 if (Ovl || FunctionTemplate || 2712 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2713 // We don't perform ADL for implicit declarations of builtins. 2714 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2715 ADL = false; 2716 2717 // We don't perform ADL in C. 2718 if (!getLangOptions().CPlusPlus) 2719 ADL = false; 2720 2721 if (Ovl || FunctionTemplate || ADL) {
|
2681 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2682 UnqualifiedName, LParenLoc, Args, 2683 NumArgs, CommaLocs, RParenLoc, ADL);
| 2722 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2723 HasExplicitTemplateArgs, 2724 ExplicitTemplateArgs, 2725 NumExplicitTemplateArgs, 2726 LParenLoc, Args, NumArgs, CommaLocs, 2727 RParenLoc, ADL);
|
2684 if (!FDecl) 2685 return ExprError(); 2686 2687 // Update Fn to refer to the actual function selected. 2688 Expr *NewFn = 0; 2689 if (QualifiedDeclRefExpr *QDRExpr
| 2728 if (!FDecl) 2729 return ExprError(); 2730 2731 // Update Fn to refer to the actual function selected. 2732 Expr *NewFn = 0; 2733 if (QualifiedDeclRefExpr *QDRExpr
|
2690 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr))
| 2734 = dyn_cast<QualifiedDeclRefExpr>(FnExpr))
|
2691 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2692 QDRExpr->getLocation(), 2693 false, false, 2694 QDRExpr->getQualifierRange(), 2695 QDRExpr->getQualifier()); 2696 else 2697 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2698 Fn->getSourceRange().getBegin()); 2699 Fn->Destroy(Context); 2700 Fn = NewFn; 2701 } 2702 } 2703 2704 // Promote the function operand. 2705 UsualUnaryConversions(Fn); 2706 2707 // Make the call expr early, before semantic checks. This guarantees cleanup 2708 // of arguments and function on error. 2709 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2710 Args, NumArgs, 2711 Context.BoolTy, 2712 RParenLoc)); 2713 2714 const FunctionType *FuncT; 2715 if (!Fn->getType()->isBlockPointerType()) { 2716 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2717 // have type pointer to function". 2718 const PointerType *PT = Fn->getType()->getAsPointerType(); 2719 if (PT == 0) 2720 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2721 << Fn->getType() << Fn->getSourceRange()); 2722 FuncT = PT->getPointeeType()->getAsFunctionType(); 2723 } else { // This is a block call. 2724 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2725 getAsFunctionType(); 2726 } 2727 if (FuncT == 0) 2728 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2729 << Fn->getType() << Fn->getSourceRange()); 2730 2731 // Check for a valid return type 2732 if (!FuncT->getResultType()->isVoidType() && 2733 RequireCompleteType(Fn->getSourceRange().getBegin(), 2734 FuncT->getResultType(), 2735 diag::err_call_incomplete_return, 2736 TheCall->getSourceRange())) 2737 return ExprError(); 2738 2739 // We know the result type of the call, set it. 2740 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2741 2742 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2743 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2744 RParenLoc)) 2745 return ExprError(); 2746 } else { 2747 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2748 2749 if (FDecl) { 2750 // Check if we have too few/too many template arguments, based 2751 // on our knowledge of the function definition. 2752 const FunctionDecl *Def = 0;
| 2735 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2736 QDRExpr->getLocation(), 2737 false, false, 2738 QDRExpr->getQualifierRange(), 2739 QDRExpr->getQualifier()); 2740 else 2741 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2742 Fn->getSourceRange().getBegin()); 2743 Fn->Destroy(Context); 2744 Fn = NewFn; 2745 } 2746 } 2747 2748 // Promote the function operand. 2749 UsualUnaryConversions(Fn); 2750 2751 // Make the call expr early, before semantic checks. This guarantees cleanup 2752 // of arguments and function on error. 2753 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2754 Args, NumArgs, 2755 Context.BoolTy, 2756 RParenLoc)); 2757 2758 const FunctionType *FuncT; 2759 if (!Fn->getType()->isBlockPointerType()) { 2760 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2761 // have type pointer to function". 2762 const PointerType *PT = Fn->getType()->getAsPointerType(); 2763 if (PT == 0) 2764 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2765 << Fn->getType() << Fn->getSourceRange()); 2766 FuncT = PT->getPointeeType()->getAsFunctionType(); 2767 } else { // This is a block call. 2768 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2769 getAsFunctionType(); 2770 } 2771 if (FuncT == 0) 2772 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2773 << Fn->getType() << Fn->getSourceRange()); 2774 2775 // Check for a valid return type 2776 if (!FuncT->getResultType()->isVoidType() && 2777 RequireCompleteType(Fn->getSourceRange().getBegin(), 2778 FuncT->getResultType(), 2779 diag::err_call_incomplete_return, 2780 TheCall->getSourceRange())) 2781 return ExprError(); 2782 2783 // We know the result type of the call, set it. 2784 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2785 2786 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2787 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2788 RParenLoc)) 2789 return ExprError(); 2790 } else { 2791 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2792 2793 if (FDecl) { 2794 // Check if we have too few/too many template arguments, based 2795 // on our knowledge of the function definition. 2796 const FunctionDecl *Def = 0;
|
2753 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) {
| 2797 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) {
|
2754 const FunctionProtoType *Proto = 2755 Def->getType()->getAsFunctionProtoType(); 2756 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2757 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2758 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2759 } 2760 } 2761 } 2762 2763 // Promote the arguments (C99 6.5.2.2p6). 2764 for (unsigned i = 0; i != NumArgs; i++) { 2765 Expr *Arg = Args[i]; 2766 DefaultArgumentPromotion(Arg); 2767 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2768 Arg->getType(), 2769 diag::err_call_incomplete_argument, 2770 Arg->getSourceRange())) 2771 return ExprError(); 2772 TheCall->setArg(i, Arg); 2773 } 2774 } 2775 2776 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2777 if (!Method->isStatic()) 2778 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2779 << Fn->getSourceRange()); 2780 2781 // Check for sentinels 2782 if (NDecl) 2783 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2784 // Do special checking on direct calls to functions. 2785 if (FDecl) 2786 return CheckFunctionCall(FDecl, TheCall.take()); 2787 if (NDecl) 2788 return CheckBlockCall(NDecl, TheCall.take()); 2789 2790 return Owned(TheCall.take()); 2791} 2792 2793Action::OwningExprResult 2794Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2795 SourceLocation RParenLoc, ExprArg InitExpr) { 2796 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2797 QualType literalType = QualType::getFromOpaquePtr(Ty); 2798 // FIXME: put back this assert when initializers are worked out. 2799 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2800 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2801 2802 if (literalType->isArrayType()) { 2803 if (literalType->isVariableArrayType()) 2804 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2805 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2806 } else if (!literalType->isDependentType() && 2807 RequireCompleteType(LParenLoc, literalType, 2808 diag::err_typecheck_decl_incomplete_type, 2809 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2810 return ExprError(); 2811 2812 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2813 DeclarationName(), /*FIXME:DirectInit=*/false)) 2814 return ExprError(); 2815 2816 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2817 if (isFileScope) { // 6.5.2.5p3 2818 if (CheckForConstantInitializer(literalExpr, literalType)) 2819 return ExprError(); 2820 } 2821 InitExpr.release(); 2822 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2823 literalExpr, isFileScope)); 2824} 2825 2826Action::OwningExprResult 2827Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2828 SourceLocation RBraceLoc) { 2829 unsigned NumInit = initlist.size(); 2830 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2831 2832 // Semantic analysis for initializers is done by ActOnDeclarator() and 2833 // CheckInitializer() - it requires knowledge of the object being intialized. 2834 2835 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2836 RBraceLoc); 2837 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2838 return Owned(E); 2839} 2840 2841/// CheckCastTypes - Check type constraints for casting between types. 2842bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2843 UsualUnaryConversions(castExpr); 2844 2845 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2846 // type needs to be scalar. 2847 if (castType->isVoidType()) { 2848 // Cast to void allows any expr type. 2849 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2850 // We can't check any more until template instantiation time. 2851 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2852 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2853 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2854 (castType->isStructureType() || castType->isUnionType())) { 2855 // GCC struct/union extension: allow cast to self. 2856 // FIXME: Check that the cast destination type is complete. 2857 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2858 << castType << castExpr->getSourceRange(); 2859 } else if (castType->isUnionType()) { 2860 // GCC cast to union extension 2861 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2862 RecordDecl::field_iterator Field, FieldEnd;
| 2798 const FunctionProtoType *Proto = 2799 Def->getType()->getAsFunctionProtoType(); 2800 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2801 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2802 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2803 } 2804 } 2805 } 2806 2807 // Promote the arguments (C99 6.5.2.2p6). 2808 for (unsigned i = 0; i != NumArgs; i++) { 2809 Expr *Arg = Args[i]; 2810 DefaultArgumentPromotion(Arg); 2811 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2812 Arg->getType(), 2813 diag::err_call_incomplete_argument, 2814 Arg->getSourceRange())) 2815 return ExprError(); 2816 TheCall->setArg(i, Arg); 2817 } 2818 } 2819 2820 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2821 if (!Method->isStatic()) 2822 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2823 << Fn->getSourceRange()); 2824 2825 // Check for sentinels 2826 if (NDecl) 2827 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2828 // Do special checking on direct calls to functions. 2829 if (FDecl) 2830 return CheckFunctionCall(FDecl, TheCall.take()); 2831 if (NDecl) 2832 return CheckBlockCall(NDecl, TheCall.take()); 2833 2834 return Owned(TheCall.take()); 2835} 2836 2837Action::OwningExprResult 2838Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2839 SourceLocation RParenLoc, ExprArg InitExpr) { 2840 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2841 QualType literalType = QualType::getFromOpaquePtr(Ty); 2842 // FIXME: put back this assert when initializers are worked out. 2843 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2844 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2845 2846 if (literalType->isArrayType()) { 2847 if (literalType->isVariableArrayType()) 2848 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2849 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2850 } else if (!literalType->isDependentType() && 2851 RequireCompleteType(LParenLoc, literalType, 2852 diag::err_typecheck_decl_incomplete_type, 2853 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2854 return ExprError(); 2855 2856 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2857 DeclarationName(), /*FIXME:DirectInit=*/false)) 2858 return ExprError(); 2859 2860 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2861 if (isFileScope) { // 6.5.2.5p3 2862 if (CheckForConstantInitializer(literalExpr, literalType)) 2863 return ExprError(); 2864 } 2865 InitExpr.release(); 2866 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2867 literalExpr, isFileScope)); 2868} 2869 2870Action::OwningExprResult 2871Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2872 SourceLocation RBraceLoc) { 2873 unsigned NumInit = initlist.size(); 2874 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2875 2876 // Semantic analysis for initializers is done by ActOnDeclarator() and 2877 // CheckInitializer() - it requires knowledge of the object being intialized. 2878 2879 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2880 RBraceLoc); 2881 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2882 return Owned(E); 2883} 2884 2885/// CheckCastTypes - Check type constraints for casting between types. 2886bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2887 UsualUnaryConversions(castExpr); 2888 2889 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2890 // type needs to be scalar. 2891 if (castType->isVoidType()) { 2892 // Cast to void allows any expr type. 2893 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2894 // We can't check any more until template instantiation time. 2895 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2896 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2897 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2898 (castType->isStructureType() || castType->isUnionType())) { 2899 // GCC struct/union extension: allow cast to self. 2900 // FIXME: Check that the cast destination type is complete. 2901 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2902 << castType << castExpr->getSourceRange(); 2903 } else if (castType->isUnionType()) { 2904 // GCC cast to union extension 2905 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2906 RecordDecl::field_iterator Field, FieldEnd;
|
2863 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context);
| 2907 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
|
2864 Field != FieldEnd; ++Field) { 2865 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2866 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2867 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2868 << castExpr->getSourceRange(); 2869 break; 2870 } 2871 } 2872 if (Field == FieldEnd) 2873 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2874 << castExpr->getType() << castExpr->getSourceRange(); 2875 } else { 2876 // Reject any other conversions to non-scalar types. 2877 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2878 << castType << castExpr->getSourceRange(); 2879 } 2880 } else if (!castExpr->getType()->isScalarType() && 2881 !castExpr->getType()->isVectorType()) { 2882 return Diag(castExpr->getLocStart(), 2883 diag::err_typecheck_expect_scalar_operand) 2884 << castExpr->getType() << castExpr->getSourceRange(); 2885 } else if (castType->isExtVectorType()) { 2886 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 2887 return true; 2888 } else if (castType->isVectorType()) { 2889 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2890 return true; 2891 } else if (castExpr->getType()->isVectorType()) { 2892 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2893 return true; 2894 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2895 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2896 } else if (!castType->isArithmeticType()) { 2897 QualType castExprType = castExpr->getType(); 2898 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2899 return Diag(castExpr->getLocStart(), 2900 diag::err_cast_pointer_from_non_pointer_int) 2901 << castExprType << castExpr->getSourceRange(); 2902 } else if (!castExpr->getType()->isArithmeticType()) { 2903 if (!castType->isIntegralType() && castType->isArithmeticType()) 2904 return Diag(castExpr->getLocStart(), 2905 diag::err_cast_pointer_to_non_pointer_int) 2906 << castType << castExpr->getSourceRange(); 2907 } 2908 if (isa<ObjCSelectorExpr>(castExpr)) 2909 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2910 return false; 2911} 2912 2913bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2914 assert(VectorTy->isVectorType() && "Not a vector type!"); 2915 2916 if (Ty->isVectorType() || Ty->isIntegerType()) { 2917 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2918 return Diag(R.getBegin(), 2919 Ty->isVectorType() ? 2920 diag::err_invalid_conversion_between_vectors : 2921 diag::err_invalid_conversion_between_vector_and_integer) 2922 << VectorTy << Ty << R; 2923 } else 2924 return Diag(R.getBegin(), 2925 diag::err_invalid_conversion_between_vector_and_scalar) 2926 << VectorTy << Ty << R; 2927 2928 return false; 2929} 2930 2931bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 2932 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 2933
| 2908 Field != FieldEnd; ++Field) { 2909 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2910 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2911 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2912 << castExpr->getSourceRange(); 2913 break; 2914 } 2915 } 2916 if (Field == FieldEnd) 2917 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2918 << castExpr->getType() << castExpr->getSourceRange(); 2919 } else { 2920 // Reject any other conversions to non-scalar types. 2921 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2922 << castType << castExpr->getSourceRange(); 2923 } 2924 } else if (!castExpr->getType()->isScalarType() && 2925 !castExpr->getType()->isVectorType()) { 2926 return Diag(castExpr->getLocStart(), 2927 diag::err_typecheck_expect_scalar_operand) 2928 << castExpr->getType() << castExpr->getSourceRange(); 2929 } else if (castType->isExtVectorType()) { 2930 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 2931 return true; 2932 } else if (castType->isVectorType()) { 2933 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2934 return true; 2935 } else if (castExpr->getType()->isVectorType()) { 2936 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2937 return true; 2938 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2939 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2940 } else if (!castType->isArithmeticType()) { 2941 QualType castExprType = castExpr->getType(); 2942 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2943 return Diag(castExpr->getLocStart(), 2944 diag::err_cast_pointer_from_non_pointer_int) 2945 << castExprType << castExpr->getSourceRange(); 2946 } else if (!castExpr->getType()->isArithmeticType()) { 2947 if (!castType->isIntegralType() && castType->isArithmeticType()) 2948 return Diag(castExpr->getLocStart(), 2949 diag::err_cast_pointer_to_non_pointer_int) 2950 << castType << castExpr->getSourceRange(); 2951 } 2952 if (isa<ObjCSelectorExpr>(castExpr)) 2953 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2954 return false; 2955} 2956 2957bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2958 assert(VectorTy->isVectorType() && "Not a vector type!"); 2959 2960 if (Ty->isVectorType() || Ty->isIntegerType()) { 2961 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2962 return Diag(R.getBegin(), 2963 Ty->isVectorType() ? 2964 diag::err_invalid_conversion_between_vectors : 2965 diag::err_invalid_conversion_between_vector_and_integer) 2966 << VectorTy << Ty << R; 2967 } else 2968 return Diag(R.getBegin(), 2969 diag::err_invalid_conversion_between_vector_and_scalar) 2970 << VectorTy << Ty << R; 2971 2972 return false; 2973} 2974 2975bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 2976 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 2977
|
2934 // If SrcTy is also an ExtVectorType, the types must be identical unless 2935 // lax vector conversions is enabled. 2936 if (SrcTy->isExtVectorType()) { 2937 if (getLangOptions().LaxVectorConversions && 2938 Context.getTypeSize(DestTy) == Context.getTypeSize(SrcTy)) 2939 return false; 2940 if (DestTy != SrcTy) 2941 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 2942 << DestTy << SrcTy << R; 2943 return false; 2944 } 2945 2946 // If SrcTy is a VectorType, then only the total size must match.
| 2978 // If SrcTy is a VectorType, the total size must match to explicitly cast to 2979 // an ExtVectorType.
|
2947 if (SrcTy->isVectorType()) { 2948 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 2949 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 2950 << DestTy << SrcTy << R; 2951 return false; 2952 } 2953
| 2980 if (SrcTy->isVectorType()) { 2981 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 2982 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 2983 << DestTy << SrcTy << R; 2984 return false; 2985 } 2986
|
2954 // All scalar -> ext vector "c-style" casts are legal; the appropriate
| 2987 // All non-pointer scalars can be cast to ExtVector type. The appropriate
|
2955 // conversion will take place first from scalar to elt type, and then 2956 // splat from elt type to vector.
| 2988 // conversion will take place first from scalar to elt type, and then 2989 // splat from elt type to vector.
|
| 2990 if (SrcTy->isPointerType()) 2991 return Diag(R.getBegin(), 2992 diag::err_invalid_conversion_between_vector_and_scalar) 2993 << DestTy << SrcTy << R;
|
2957 return false; 2958} 2959 2960Action::OwningExprResult 2961Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2962 SourceLocation RParenLoc, ExprArg Op) { 2963 assert((Ty != 0) && (Op.get() != 0) && 2964 "ActOnCastExpr(): missing type or expr"); 2965 2966 Expr *castExpr = Op.takeAs<Expr>(); 2967 QualType castType = QualType::getFromOpaquePtr(Ty); 2968 2969 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2970 return ExprError(); 2971 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2972 LParenLoc, RParenLoc)); 2973} 2974 2975/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2976/// In that case, lhs = cond. 2977/// C99 6.5.15 2978QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2979 SourceLocation QuestionLoc) { 2980 // C++ is sufficiently different to merit its own checker. 2981 if (getLangOptions().CPlusPlus) 2982 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2983 2984 UsualUnaryConversions(Cond); 2985 UsualUnaryConversions(LHS); 2986 UsualUnaryConversions(RHS); 2987 QualType CondTy = Cond->getType(); 2988 QualType LHSTy = LHS->getType(); 2989 QualType RHSTy = RHS->getType(); 2990 2991 // first, check the condition. 2992 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2993 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2994 << CondTy; 2995 return QualType(); 2996 } 2997 2998 // Now check the two expressions. 2999 3000 // If both operands have arithmetic type, do the usual arithmetic conversions 3001 // to find a common type: C99 6.5.15p3,5. 3002 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3003 UsualArithmeticConversions(LHS, RHS); 3004 return LHS->getType(); 3005 } 3006 3007 // If both operands are the same structure or union type, the result is that 3008 // type. 3009 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 3010 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 3011 if (LHSRT->getDecl() == RHSRT->getDecl()) 3012 // "If both the operands have structure or union type, the result has 3013 // that type." This implies that CV qualifiers are dropped. 3014 return LHSTy.getUnqualifiedType(); 3015 // FIXME: Type of conditional expression must be complete in C mode. 3016 } 3017 3018 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3019 // The following || allows only one side to be void (a GCC-ism). 3020 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3021 if (!LHSTy->isVoidType()) 3022 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3023 << RHS->getSourceRange(); 3024 if (!RHSTy->isVoidType()) 3025 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3026 << LHS->getSourceRange(); 3027 ImpCastExprToType(LHS, Context.VoidTy); 3028 ImpCastExprToType(RHS, Context.VoidTy); 3029 return Context.VoidTy; 3030 } 3031 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3032 // the type of the other operand." 3033 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 3034 Context.isObjCObjectPointerType(LHSTy)) && 3035 RHS->isNullPointerConstant(Context)) { 3036 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3037 return LHSTy; 3038 } 3039 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 3040 Context.isObjCObjectPointerType(RHSTy)) && 3041 LHS->isNullPointerConstant(Context)) { 3042 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3043 return RHSTy; 3044 }
| 2994 return false; 2995} 2996 2997Action::OwningExprResult 2998Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2999 SourceLocation RParenLoc, ExprArg Op) { 3000 assert((Ty != 0) && (Op.get() != 0) && 3001 "ActOnCastExpr(): missing type or expr"); 3002 3003 Expr *castExpr = Op.takeAs<Expr>(); 3004 QualType castType = QualType::getFromOpaquePtr(Ty); 3005 3006 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 3007 return ExprError(); 3008 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 3009 LParenLoc, RParenLoc)); 3010} 3011 3012/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3013/// In that case, lhs = cond. 3014/// C99 6.5.15 3015QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3016 SourceLocation QuestionLoc) { 3017 // C++ is sufficiently different to merit its own checker. 3018 if (getLangOptions().CPlusPlus) 3019 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3020 3021 UsualUnaryConversions(Cond); 3022 UsualUnaryConversions(LHS); 3023 UsualUnaryConversions(RHS); 3024 QualType CondTy = Cond->getType(); 3025 QualType LHSTy = LHS->getType(); 3026 QualType RHSTy = RHS->getType(); 3027 3028 // first, check the condition. 3029 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3030 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3031 << CondTy; 3032 return QualType(); 3033 } 3034 3035 // Now check the two expressions. 3036 3037 // If both operands have arithmetic type, do the usual arithmetic conversions 3038 // to find a common type: C99 6.5.15p3,5. 3039 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3040 UsualArithmeticConversions(LHS, RHS); 3041 return LHS->getType(); 3042 } 3043 3044 // If both operands are the same structure or union type, the result is that 3045 // type. 3046 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 3047 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 3048 if (LHSRT->getDecl() == RHSRT->getDecl()) 3049 // "If both the operands have structure or union type, the result has 3050 // that type." This implies that CV qualifiers are dropped. 3051 return LHSTy.getUnqualifiedType(); 3052 // FIXME: Type of conditional expression must be complete in C mode. 3053 } 3054 3055 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3056 // The following || allows only one side to be void (a GCC-ism). 3057 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3058 if (!LHSTy->isVoidType()) 3059 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3060 << RHS->getSourceRange(); 3061 if (!RHSTy->isVoidType()) 3062 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3063 << LHS->getSourceRange(); 3064 ImpCastExprToType(LHS, Context.VoidTy); 3065 ImpCastExprToType(RHS, Context.VoidTy); 3066 return Context.VoidTy; 3067 } 3068 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3069 // the type of the other operand." 3070 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 3071 Context.isObjCObjectPointerType(LHSTy)) && 3072 RHS->isNullPointerConstant(Context)) { 3073 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3074 return LHSTy; 3075 } 3076 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 3077 Context.isObjCObjectPointerType(RHSTy)) && 3078 LHS->isNullPointerConstant(Context)) { 3079 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3080 return RHSTy; 3081 }
|
| 3082 // Handle block pointer types. 3083 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3084 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3085 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3086 QualType destType = Context.getPointerType(Context.VoidTy); 3087 ImpCastExprToType(LHS, destType); 3088 ImpCastExprToType(RHS, destType); 3089 return destType; 3090 } 3091 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3092 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3093 return QualType(); 3094 } 3095 // We have 2 block pointer types. 3096 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3097 // Two identical block pointer types are always compatible. 3098 return LHSTy; 3099 } 3100 // The block pointer types aren't identical, continue checking. 3101 QualType lhptee = LHSTy->getAsBlockPointerType()->getPointeeType(); 3102 QualType rhptee = RHSTy->getAsBlockPointerType()->getPointeeType();
|
3045
| 3103
|
3046 const PointerType *LHSPT = LHSTy->getAsPointerType(); 3047 const PointerType *RHSPT = RHSTy->getAsPointerType(); 3048 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); 3049 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType();
| 3104 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3105 rhptee.getUnqualifiedType())) { 3106 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3107 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3108 // In this situation, we assume void* type. No especially good 3109 // reason, but this is what gcc does, and we do have to pick 3110 // to get a consistent AST. 3111 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3112 ImpCastExprToType(LHS, incompatTy); 3113 ImpCastExprToType(RHS, incompatTy); 3114 return incompatTy; 3115 } 3116 // The block pointer types are compatible. 3117 ImpCastExprToType(LHS, LHSTy); 3118 ImpCastExprToType(RHS, LHSTy); 3119 return LHSTy; 3120 } 3121 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3122 // evaluates to "struct objc_object *" (and is handled above when comparing 3123 // id with statically typed objects). 3124 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3125 // GCC allows qualified id and any Objective-C type to devolve to 3126 // id. Currently localizing to here until clear this should be 3127 // part of ObjCQualifiedIdTypesAreCompatible. 3128 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3129 (LHSTy->isObjCQualifiedIdType() && 3130 Context.isObjCObjectPointerType(RHSTy)) || 3131 (RHSTy->isObjCQualifiedIdType() && 3132 Context.isObjCObjectPointerType(LHSTy))) { 3133 // FIXME: This is not the correct composite type. This only happens to 3134 // work because id can more or less be used anywhere, however this may 3135 // change the type of method sends.
|
3050
| 3136
|
3051 // Handle the case where both operands are pointers before we handle null 3052 // pointer constants in case both operands are null pointer constants. 3053 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6
| 3137 // FIXME: gcc adds some type-checking of the arguments and emits 3138 // (confusing) incompatible comparison warnings in some 3139 // cases. Investigate. 3140 QualType compositeType = Context.getObjCIdType(); 3141 ImpCastExprToType(LHS, compositeType); 3142 ImpCastExprToType(RHS, compositeType); 3143 return compositeType; 3144 } 3145 } 3146 // Check constraints for Objective-C object pointers types. 3147 if (Context.isObjCObjectPointerType(LHSTy) && 3148 Context.isObjCObjectPointerType(RHSTy)) { 3149 3150 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3151 // Two identical object pointer types are always compatible. 3152 return LHSTy; 3153 } 3154 // No need to check for block pointer types or qualified id types (they 3155 // were handled above). 3156 assert((LHSTy->isPointerType() && RHSTy->isPointerType()) && 3157 "Sema::CheckConditionalOperands(): Unexpected type"); 3158 QualType lhptee = LHSTy->getAsPointerType()->getPointeeType(); 3159 QualType rhptee = RHSTy->getAsPointerType()->getPointeeType(); 3160 3161 QualType compositeType = LHSTy; 3162 3163 // If both operands are interfaces and either operand can be 3164 // assigned to the other, use that type as the composite 3165 // type. This allows 3166 // xxx ? (A*) a : (B*) b 3167 // where B is a subclass of A. 3168 // 3169 // Additionally, as for assignment, if either type is 'id' 3170 // allow silent coercion. Finally, if the types are 3171 // incompatible then make sure to use 'id' as the composite 3172 // type so the result is acceptable for sending messages to. 3173 3174 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3175 // It could return the composite type. 3176 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3177 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3178 if (LHSIface && RHSIface && 3179 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 3180 compositeType = LHSTy; 3181 } else if (LHSIface && RHSIface && 3182 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3183 compositeType = RHSTy; 3184 } else if (Context.isObjCIdStructType(lhptee) || 3185 Context.isObjCIdStructType(rhptee)) { 3186 compositeType = Context.getObjCIdType(); 3187 } else { 3188 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3189 << LHSTy << RHSTy 3190 << LHS->getSourceRange() << RHS->getSourceRange(); 3191 QualType incompatTy = Context.getObjCIdType(); 3192 ImpCastExprToType(LHS, incompatTy); 3193 ImpCastExprToType(RHS, incompatTy); 3194 return incompatTy; 3195 } 3196 // The object pointer types are compatible. 3197 ImpCastExprToType(LHS, compositeType); 3198 ImpCastExprToType(RHS, compositeType); 3199 return compositeType; 3200 } 3201 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3202 if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
|
3054 // get the "pointed to" types
| 3203 // get the "pointed to" types
|
3055 QualType lhptee = (LHSPT ? LHSPT->getPointeeType() 3056 : LHSBPT->getPointeeType()); 3057 QualType rhptee = (RHSPT ? RHSPT->getPointeeType() 3058 : RHSBPT->getPointeeType());
| 3204 QualType lhptee = LHSTy->getAsPointerType()->getPointeeType(); 3205 QualType rhptee = RHSTy->getAsPointerType()->getPointeeType();
|
3059 3060 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
| 3206 3207 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
|
3061 if (lhptee->isVoidType() 3062 && (RHSBPT || rhptee->isIncompleteOrObjectType())) {
| 3208 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
|
3063 // Figure out necessary qualifiers (C99 6.5.15p6) 3064 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3065 QualType destType = Context.getPointerType(destPointee); 3066 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3067 ImpCastExprToType(RHS, destType); // promote to void* 3068 return destType; 3069 }
| 3209 // Figure out necessary qualifiers (C99 6.5.15p6) 3210 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3211 QualType destType = Context.getPointerType(destPointee); 3212 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3213 ImpCastExprToType(RHS, destType); // promote to void* 3214 return destType; 3215 }
|
3070 if (rhptee->isVoidType() 3071 && (LHSBPT || lhptee->isIncompleteOrObjectType())) {
| 3216 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
|
3072 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3073 QualType destType = Context.getPointerType(destPointee); 3074 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3075 ImpCastExprToType(RHS, destType); // promote to void* 3076 return destType; 3077 } 3078
| 3217 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3218 QualType destType = Context.getPointerType(destPointee); 3219 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3220 ImpCastExprToType(RHS, destType); // promote to void* 3221 return destType; 3222 } 3223
|
3079 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); 3080 if (sameKind 3081 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
| 3224 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
|
3082 // Two identical pointer types are always compatible. 3083 return LHSTy; 3084 }
| 3225 // Two identical pointer types are always compatible. 3226 return LHSTy; 3227 }
|
3085 3086 QualType compositeType = LHSTy; 3087 3088 // If either type is an Objective-C object type then check 3089 // compatibility according to Objective-C. 3090 if (Context.isObjCObjectPointerType(LHSTy) || 3091 Context.isObjCObjectPointerType(RHSTy)) { 3092 // If both operands are interfaces and either operand can be 3093 // assigned to the other, use that type as the composite 3094 // type. This allows 3095 // xxx ? (A*) a : (B*) b 3096 // where B is a subclass of A. 3097 // 3098 // Additionally, as for assignment, if either type is 'id' 3099 // allow silent coercion. Finally, if the types are 3100 // incompatible then make sure to use 'id' as the composite 3101 // type so the result is acceptable for sending messages to. 3102 3103 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3104 // It could return the composite type. 3105 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3106 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3107 if (LHSIface && RHSIface && 3108 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 3109 compositeType = LHSTy; 3110 } else if (LHSIface && RHSIface && 3111 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3112 compositeType = RHSTy; 3113 } else if (Context.isObjCIdStructType(lhptee) || 3114 Context.isObjCIdStructType(rhptee)) { 3115 compositeType = Context.getObjCIdType(); 3116 } else if (LHSBPT || RHSBPT) { 3117 if (!sameKind 3118 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3119 rhptee.getUnqualifiedType())) 3120 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3121 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3122 return QualType(); 3123 } else { 3124 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3125 << LHSTy << RHSTy 3126 << LHS->getSourceRange() << RHS->getSourceRange(); 3127 QualType incompatTy = Context.getObjCIdType(); 3128 ImpCastExprToType(LHS, incompatTy); 3129 ImpCastExprToType(RHS, incompatTy); 3130 return incompatTy; 3131 } 3132 } else if (!sameKind 3133 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3134 rhptee.getUnqualifiedType())) {
| 3228 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3229 rhptee.getUnqualifiedType())) {
|
3135 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3136 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3137 // In this situation, we assume void* type. No especially good 3138 // reason, but this is what gcc does, and we do have to pick 3139 // to get a consistent AST. 3140 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3141 ImpCastExprToType(LHS, incompatTy); 3142 ImpCastExprToType(RHS, incompatTy); 3143 return incompatTy; 3144 } 3145 // The pointer types are compatible. 3146 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3147 // differently qualified versions of compatible types, the result type is 3148 // a pointer to an appropriately qualified version of the *composite* 3149 // type. 3150 // FIXME: Need to calculate the composite type. 3151 // FIXME: Need to add qualifiers
| 3230 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3231 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3232 // In this situation, we assume void* type. No especially good 3233 // reason, but this is what gcc does, and we do have to pick 3234 // to get a consistent AST. 3235 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3236 ImpCastExprToType(LHS, incompatTy); 3237 ImpCastExprToType(RHS, incompatTy); 3238 return incompatTy; 3239 } 3240 // The pointer types are compatible. 3241 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3242 // differently qualified versions of compatible types, the result type is 3243 // a pointer to an appropriately qualified version of the *composite* 3244 // type. 3245 // FIXME: Need to calculate the composite type. 3246 // FIXME: Need to add qualifiers
|
3152 ImpCastExprToType(LHS, compositeType); 3153 ImpCastExprToType(RHS, compositeType); 3154 return compositeType;
| 3247 ImpCastExprToType(LHS, LHSTy); 3248 ImpCastExprToType(RHS, LHSTy); 3249 return LHSTy;
|
3155 }
| 3250 }
|
3156
| 3251
|
3157 // GCC compatibility: soften pointer/integer mismatch. 3158 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3159 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3160 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3161 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3162 return RHSTy; 3163 } 3164 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3165 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3166 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3167 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3168 return LHSTy; 3169 } 3170
| 3252 // GCC compatibility: soften pointer/integer mismatch. 3253 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3254 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3255 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3256 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3257 return RHSTy; 3258 } 3259 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3260 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3261 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3262 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3263 return LHSTy; 3264 } 3265
|
3171 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3172 // evaluates to "struct objc_object *" (and is handled above when comparing 3173 // id with statically typed objects). 3174 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3175 // GCC allows qualified id and any Objective-C type to devolve to 3176 // id. Currently localizing to here until clear this should be 3177 // part of ObjCQualifiedIdTypesAreCompatible. 3178 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3179 (LHSTy->isObjCQualifiedIdType() && 3180 Context.isObjCObjectPointerType(RHSTy)) || 3181 (RHSTy->isObjCQualifiedIdType() && 3182 Context.isObjCObjectPointerType(LHSTy))) { 3183 // FIXME: This is not the correct composite type. This only happens to 3184 // work because id can more or less be used anywhere, however this may 3185 // change the type of method sends. 3186 3187 // FIXME: gcc adds some type-checking of the arguments and emits 3188 // (confusing) incompatible comparison warnings in some 3189 // cases. Investigate. 3190 QualType compositeType = Context.getObjCIdType(); 3191 ImpCastExprToType(LHS, compositeType); 3192 ImpCastExprToType(RHS, compositeType); 3193 return compositeType; 3194 } 3195 } 3196
| |
3197 // Otherwise, the operands are not compatible. 3198 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3199 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3200 return QualType(); 3201} 3202 3203/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3204/// in the case of a the GNU conditional expr extension. 3205Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3206 SourceLocation ColonLoc, 3207 ExprArg Cond, ExprArg LHS, 3208 ExprArg RHS) { 3209 Expr *CondExpr = (Expr *) Cond.get(); 3210 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3211 3212 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3213 // was the condition. 3214 bool isLHSNull = LHSExpr == 0; 3215 if (isLHSNull) 3216 LHSExpr = CondExpr; 3217 3218 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3219 RHSExpr, QuestionLoc); 3220 if (result.isNull()) 3221 return ExprError(); 3222 3223 Cond.release(); 3224 LHS.release(); 3225 RHS.release(); 3226 return Owned(new (Context) ConditionalOperator(CondExpr, 3227 isLHSNull ? 0 : LHSExpr, 3228 RHSExpr, result)); 3229} 3230 3231 3232// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3233// being closely modeled after the C99 spec:-). The odd characteristic of this 3234// routine is it effectively iqnores the qualifiers on the top level pointee. 3235// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3236// FIXME: add a couple examples in this comment. 3237Sema::AssignConvertType 3238Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3239 QualType lhptee, rhptee; 3240 3241 // get the "pointed to" type (ignoring qualifiers at the top level) 3242 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3243 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3244 3245 // make sure we operate on the canonical type 3246 lhptee = Context.getCanonicalType(lhptee); 3247 rhptee = Context.getCanonicalType(rhptee); 3248 3249 AssignConvertType ConvTy = Compatible; 3250 3251 // C99 6.5.16.1p1: This following citation is common to constraints 3252 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3253 // qualifiers of the type *pointed to* by the right; 3254 // FIXME: Handle ExtQualType 3255 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3256 ConvTy = CompatiblePointerDiscardsQualifiers; 3257 3258 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3259 // incomplete type and the other is a pointer to a qualified or unqualified 3260 // version of void... 3261 if (lhptee->isVoidType()) { 3262 if (rhptee->isIncompleteOrObjectType()) 3263 return ConvTy; 3264 3265 // As an extension, we allow cast to/from void* to function pointer. 3266 assert(rhptee->isFunctionType()); 3267 return FunctionVoidPointer; 3268 } 3269 3270 if (rhptee->isVoidType()) { 3271 if (lhptee->isIncompleteOrObjectType()) 3272 return ConvTy; 3273 3274 // As an extension, we allow cast to/from void* to function pointer. 3275 assert(lhptee->isFunctionType()); 3276 return FunctionVoidPointer; 3277 } 3278 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3279 // unqualified versions of compatible types, ... 3280 lhptee = lhptee.getUnqualifiedType(); 3281 rhptee = rhptee.getUnqualifiedType(); 3282 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3283 // Check if the pointee types are compatible ignoring the sign. 3284 // We explicitly check for char so that we catch "char" vs 3285 // "unsigned char" on systems where "char" is unsigned. 3286 if (lhptee->isCharType()) { 3287 lhptee = Context.UnsignedCharTy; 3288 } else if (lhptee->isSignedIntegerType()) { 3289 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3290 } 3291 if (rhptee->isCharType()) { 3292 rhptee = Context.UnsignedCharTy; 3293 } else if (rhptee->isSignedIntegerType()) { 3294 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3295 } 3296 if (lhptee == rhptee) { 3297 // Types are compatible ignoring the sign. Qualifier incompatibility 3298 // takes priority over sign incompatibility because the sign 3299 // warning can be disabled. 3300 if (ConvTy != Compatible) 3301 return ConvTy; 3302 return IncompatiblePointerSign; 3303 } 3304 // General pointer incompatibility takes priority over qualifiers. 3305 return IncompatiblePointer; 3306 } 3307 return ConvTy; 3308} 3309 3310/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3311/// block pointer types are compatible or whether a block and normal pointer 3312/// are compatible. It is more restrict than comparing two function pointer 3313// types. 3314Sema::AssignConvertType 3315Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3316 QualType rhsType) { 3317 QualType lhptee, rhptee; 3318 3319 // get the "pointed to" type (ignoring qualifiers at the top level) 3320 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3321 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3322 3323 // make sure we operate on the canonical type 3324 lhptee = Context.getCanonicalType(lhptee); 3325 rhptee = Context.getCanonicalType(rhptee); 3326 3327 AssignConvertType ConvTy = Compatible; 3328 3329 // For blocks we enforce that qualifiers are identical. 3330 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3331 ConvTy = CompatiblePointerDiscardsQualifiers; 3332 3333 if (!Context.typesAreCompatible(lhptee, rhptee)) 3334 return IncompatibleBlockPointer; 3335 return ConvTy; 3336} 3337 3338/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3339/// has code to accommodate several GCC extensions when type checking 3340/// pointers. Here are some objectionable examples that GCC considers warnings: 3341/// 3342/// int a, *pint; 3343/// short *pshort; 3344/// struct foo *pfoo; 3345/// 3346/// pint = pshort; // warning: assignment from incompatible pointer type 3347/// a = pint; // warning: assignment makes integer from pointer without a cast 3348/// pint = a; // warning: assignment makes pointer from integer without a cast 3349/// pint = pfoo; // warning: assignment from incompatible pointer type 3350/// 3351/// As a result, the code for dealing with pointers is more complex than the 3352/// C99 spec dictates. 3353/// 3354Sema::AssignConvertType 3355Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3356 // Get canonical types. We're not formatting these types, just comparing 3357 // them. 3358 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3359 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3360 3361 if (lhsType == rhsType) 3362 return Compatible; // Common case: fast path an exact match. 3363 3364 // If the left-hand side is a reference type, then we are in a 3365 // (rare!) case where we've allowed the use of references in C, 3366 // e.g., as a parameter type in a built-in function. In this case, 3367 // just make sure that the type referenced is compatible with the 3368 // right-hand side type. The caller is responsible for adjusting 3369 // lhsType so that the resulting expression does not have reference 3370 // type. 3371 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3372 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3373 return Compatible; 3374 return Incompatible; 3375 } 3376 3377 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3378 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3379 return Compatible; 3380 // Relax integer conversions like we do for pointers below. 3381 if (rhsType->isIntegerType()) 3382 return IntToPointer; 3383 if (lhsType->isIntegerType()) 3384 return PointerToInt; 3385 return IncompatibleObjCQualifiedId; 3386 } 3387
| 3266 // Otherwise, the operands are not compatible. 3267 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3268 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3269 return QualType(); 3270} 3271 3272/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3273/// in the case of a the GNU conditional expr extension. 3274Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3275 SourceLocation ColonLoc, 3276 ExprArg Cond, ExprArg LHS, 3277 ExprArg RHS) { 3278 Expr *CondExpr = (Expr *) Cond.get(); 3279 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3280 3281 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3282 // was the condition. 3283 bool isLHSNull = LHSExpr == 0; 3284 if (isLHSNull) 3285 LHSExpr = CondExpr; 3286 3287 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3288 RHSExpr, QuestionLoc); 3289 if (result.isNull()) 3290 return ExprError(); 3291 3292 Cond.release(); 3293 LHS.release(); 3294 RHS.release(); 3295 return Owned(new (Context) ConditionalOperator(CondExpr, 3296 isLHSNull ? 0 : LHSExpr, 3297 RHSExpr, result)); 3298} 3299 3300 3301// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3302// being closely modeled after the C99 spec:-). The odd characteristic of this 3303// routine is it effectively iqnores the qualifiers on the top level pointee. 3304// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3305// FIXME: add a couple examples in this comment. 3306Sema::AssignConvertType 3307Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3308 QualType lhptee, rhptee; 3309 3310 // get the "pointed to" type (ignoring qualifiers at the top level) 3311 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3312 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3313 3314 // make sure we operate on the canonical type 3315 lhptee = Context.getCanonicalType(lhptee); 3316 rhptee = Context.getCanonicalType(rhptee); 3317 3318 AssignConvertType ConvTy = Compatible; 3319 3320 // C99 6.5.16.1p1: This following citation is common to constraints 3321 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3322 // qualifiers of the type *pointed to* by the right; 3323 // FIXME: Handle ExtQualType 3324 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3325 ConvTy = CompatiblePointerDiscardsQualifiers; 3326 3327 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3328 // incomplete type and the other is a pointer to a qualified or unqualified 3329 // version of void... 3330 if (lhptee->isVoidType()) { 3331 if (rhptee->isIncompleteOrObjectType()) 3332 return ConvTy; 3333 3334 // As an extension, we allow cast to/from void* to function pointer. 3335 assert(rhptee->isFunctionType()); 3336 return FunctionVoidPointer; 3337 } 3338 3339 if (rhptee->isVoidType()) { 3340 if (lhptee->isIncompleteOrObjectType()) 3341 return ConvTy; 3342 3343 // As an extension, we allow cast to/from void* to function pointer. 3344 assert(lhptee->isFunctionType()); 3345 return FunctionVoidPointer; 3346 } 3347 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3348 // unqualified versions of compatible types, ... 3349 lhptee = lhptee.getUnqualifiedType(); 3350 rhptee = rhptee.getUnqualifiedType(); 3351 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3352 // Check if the pointee types are compatible ignoring the sign. 3353 // We explicitly check for char so that we catch "char" vs 3354 // "unsigned char" on systems where "char" is unsigned. 3355 if (lhptee->isCharType()) { 3356 lhptee = Context.UnsignedCharTy; 3357 } else if (lhptee->isSignedIntegerType()) { 3358 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3359 } 3360 if (rhptee->isCharType()) { 3361 rhptee = Context.UnsignedCharTy; 3362 } else if (rhptee->isSignedIntegerType()) { 3363 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3364 } 3365 if (lhptee == rhptee) { 3366 // Types are compatible ignoring the sign. Qualifier incompatibility 3367 // takes priority over sign incompatibility because the sign 3368 // warning can be disabled. 3369 if (ConvTy != Compatible) 3370 return ConvTy; 3371 return IncompatiblePointerSign; 3372 } 3373 // General pointer incompatibility takes priority over qualifiers. 3374 return IncompatiblePointer; 3375 } 3376 return ConvTy; 3377} 3378 3379/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3380/// block pointer types are compatible or whether a block and normal pointer 3381/// are compatible. It is more restrict than comparing two function pointer 3382// types. 3383Sema::AssignConvertType 3384Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3385 QualType rhsType) { 3386 QualType lhptee, rhptee; 3387 3388 // get the "pointed to" type (ignoring qualifiers at the top level) 3389 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3390 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3391 3392 // make sure we operate on the canonical type 3393 lhptee = Context.getCanonicalType(lhptee); 3394 rhptee = Context.getCanonicalType(rhptee); 3395 3396 AssignConvertType ConvTy = Compatible; 3397 3398 // For blocks we enforce that qualifiers are identical. 3399 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3400 ConvTy = CompatiblePointerDiscardsQualifiers; 3401 3402 if (!Context.typesAreCompatible(lhptee, rhptee)) 3403 return IncompatibleBlockPointer; 3404 return ConvTy; 3405} 3406 3407/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3408/// has code to accommodate several GCC extensions when type checking 3409/// pointers. Here are some objectionable examples that GCC considers warnings: 3410/// 3411/// int a, *pint; 3412/// short *pshort; 3413/// struct foo *pfoo; 3414/// 3415/// pint = pshort; // warning: assignment from incompatible pointer type 3416/// a = pint; // warning: assignment makes integer from pointer without a cast 3417/// pint = a; // warning: assignment makes pointer from integer without a cast 3418/// pint = pfoo; // warning: assignment from incompatible pointer type 3419/// 3420/// As a result, the code for dealing with pointers is more complex than the 3421/// C99 spec dictates. 3422/// 3423Sema::AssignConvertType 3424Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3425 // Get canonical types. We're not formatting these types, just comparing 3426 // them. 3427 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3428 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3429 3430 if (lhsType == rhsType) 3431 return Compatible; // Common case: fast path an exact match. 3432 3433 // If the left-hand side is a reference type, then we are in a 3434 // (rare!) case where we've allowed the use of references in C, 3435 // e.g., as a parameter type in a built-in function. In this case, 3436 // just make sure that the type referenced is compatible with the 3437 // right-hand side type. The caller is responsible for adjusting 3438 // lhsType so that the resulting expression does not have reference 3439 // type. 3440 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3441 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3442 return Compatible; 3443 return Incompatible; 3444 } 3445 3446 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3447 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3448 return Compatible; 3449 // Relax integer conversions like we do for pointers below. 3450 if (rhsType->isIntegerType()) 3451 return IntToPointer; 3452 if (lhsType->isIntegerType()) 3453 return PointerToInt; 3454 return IncompatibleObjCQualifiedId; 3455 } 3456
|
| 3457 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3458 // to the same ExtVector type. 3459 if (lhsType->isExtVectorType()) { 3460 if (rhsType->isExtVectorType()) 3461 return lhsType == rhsType ? Compatible : Incompatible; 3462 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3463 return Compatible; 3464 } 3465
|
3388 if (lhsType->isVectorType() || rhsType->isVectorType()) {
| 3466 if (lhsType->isVectorType() || rhsType->isVectorType()) {
|
3389 // For ExtVector, allow vector splats; float -> <n x float> 3390 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3391 if (LV->getElementType() == rhsType) 3392 return Compatible; 3393
| |
3394 // If we are allowing lax vector conversions, and LHS and RHS are both 3395 // vectors, the total size only needs to be the same. This is a bitcast; 3396 // no bits are changed but the result type is different. 3397 if (getLangOptions().LaxVectorConversions && 3398 lhsType->isVectorType() && rhsType->isVectorType()) { 3399 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3400 return IncompatibleVectors; 3401 } 3402 return Incompatible; 3403 } 3404 3405 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3406 return Compatible; 3407 3408 if (isa<PointerType>(lhsType)) { 3409 if (rhsType->isIntegerType()) 3410 return IntToPointer; 3411 3412 if (isa<PointerType>(rhsType)) 3413 return CheckPointerTypesForAssignment(lhsType, rhsType); 3414 3415 if (rhsType->getAsBlockPointerType()) { 3416 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3417 return Compatible; 3418 3419 // Treat block pointers as objects. 3420 if (getLangOptions().ObjC1 && 3421 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3422 return Compatible; 3423 } 3424 return Incompatible; 3425 } 3426 3427 if (isa<BlockPointerType>(lhsType)) { 3428 if (rhsType->isIntegerType()) 3429 return IntToBlockPointer; 3430 3431 // Treat block pointers as objects. 3432 if (getLangOptions().ObjC1 && 3433 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3434 return Compatible; 3435 3436 if (rhsType->isBlockPointerType()) 3437 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3438 3439 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3440 if (RHSPT->getPointeeType()->isVoidType()) 3441 return Compatible; 3442 } 3443 return Incompatible; 3444 } 3445 3446 if (isa<PointerType>(rhsType)) { 3447 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3448 if (lhsType == Context.BoolTy) 3449 return Compatible; 3450 3451 if (lhsType->isIntegerType()) 3452 return PointerToInt; 3453 3454 if (isa<PointerType>(lhsType)) 3455 return CheckPointerTypesForAssignment(lhsType, rhsType); 3456 3457 if (isa<BlockPointerType>(lhsType) && 3458 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3459 return Compatible; 3460 return Incompatible; 3461 } 3462 3463 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3464 if (Context.typesAreCompatible(lhsType, rhsType)) 3465 return Compatible; 3466 } 3467 return Incompatible; 3468} 3469 3470/// \brief Constructs a transparent union from an expression that is 3471/// used to initialize the transparent union. 3472static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3473 QualType UnionType, FieldDecl *Field) { 3474 // Build an initializer list that designates the appropriate member 3475 // of the transparent union. 3476 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3477 &E, 1, 3478 SourceLocation()); 3479 Initializer->setType(UnionType); 3480 Initializer->setInitializedFieldInUnion(Field); 3481 3482 // Build a compound literal constructing a value of the transparent 3483 // union type from this initializer list. 3484 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3485 false); 3486} 3487 3488Sema::AssignConvertType 3489Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3490 QualType FromType = rExpr->getType(); 3491 3492 // If the ArgType is a Union type, we want to handle a potential 3493 // transparent_union GCC extension. 3494 const RecordType *UT = ArgType->getAsUnionType();
| 3467 // If we are allowing lax vector conversions, and LHS and RHS are both 3468 // vectors, the total size only needs to be the same. This is a bitcast; 3469 // no bits are changed but the result type is different. 3470 if (getLangOptions().LaxVectorConversions && 3471 lhsType->isVectorType() && rhsType->isVectorType()) { 3472 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3473 return IncompatibleVectors; 3474 } 3475 return Incompatible; 3476 } 3477 3478 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3479 return Compatible; 3480 3481 if (isa<PointerType>(lhsType)) { 3482 if (rhsType->isIntegerType()) 3483 return IntToPointer; 3484 3485 if (isa<PointerType>(rhsType)) 3486 return CheckPointerTypesForAssignment(lhsType, rhsType); 3487 3488 if (rhsType->getAsBlockPointerType()) { 3489 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3490 return Compatible; 3491 3492 // Treat block pointers as objects. 3493 if (getLangOptions().ObjC1 && 3494 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3495 return Compatible; 3496 } 3497 return Incompatible; 3498 } 3499 3500 if (isa<BlockPointerType>(lhsType)) { 3501 if (rhsType->isIntegerType()) 3502 return IntToBlockPointer; 3503 3504 // Treat block pointers as objects. 3505 if (getLangOptions().ObjC1 && 3506 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3507 return Compatible; 3508 3509 if (rhsType->isBlockPointerType()) 3510 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3511 3512 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3513 if (RHSPT->getPointeeType()->isVoidType()) 3514 return Compatible; 3515 } 3516 return Incompatible; 3517 } 3518 3519 if (isa<PointerType>(rhsType)) { 3520 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3521 if (lhsType == Context.BoolTy) 3522 return Compatible; 3523 3524 if (lhsType->isIntegerType()) 3525 return PointerToInt; 3526 3527 if (isa<PointerType>(lhsType)) 3528 return CheckPointerTypesForAssignment(lhsType, rhsType); 3529 3530 if (isa<BlockPointerType>(lhsType) && 3531 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3532 return Compatible; 3533 return Incompatible; 3534 } 3535 3536 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3537 if (Context.typesAreCompatible(lhsType, rhsType)) 3538 return Compatible; 3539 } 3540 return Incompatible; 3541} 3542 3543/// \brief Constructs a transparent union from an expression that is 3544/// used to initialize the transparent union. 3545static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3546 QualType UnionType, FieldDecl *Field) { 3547 // Build an initializer list that designates the appropriate member 3548 // of the transparent union. 3549 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3550 &E, 1, 3551 SourceLocation()); 3552 Initializer->setType(UnionType); 3553 Initializer->setInitializedFieldInUnion(Field); 3554 3555 // Build a compound literal constructing a value of the transparent 3556 // union type from this initializer list. 3557 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3558 false); 3559} 3560 3561Sema::AssignConvertType 3562Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3563 QualType FromType = rExpr->getType(); 3564 3565 // If the ArgType is a Union type, we want to handle a potential 3566 // transparent_union GCC extension. 3567 const RecordType *UT = ArgType->getAsUnionType();
|
3495 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>(Context))
| 3568 if (!UT || !UT->getDecl()->hasAttr())
|
3496 return Incompatible; 3497 3498 // The field to initialize within the transparent union. 3499 RecordDecl *UD = UT->getDecl(); 3500 FieldDecl *InitField = 0; 3501 // It's compatible if the expression matches any of the fields.
| 3569 return Incompatible; 3570 3571 // The field to initialize within the transparent union. 3572 RecordDecl *UD = UT->getDecl(); 3573 FieldDecl *InitField = 0; 3574 // It's compatible if the expression matches any of the fields.
|
3502 for (RecordDecl::field_iterator it = UD->field_begin(Context), 3503 itend = UD->field_end(Context);
| 3575 for (RecordDecl::field_iterator it = UD->field_begin(), 3576 itend = UD->field_end();
|
3504 it != itend; ++it) { 3505 if (it->getType()->isPointerType()) { 3506 // If the transparent union contains a pointer type, we allow: 3507 // 1) void pointer 3508 // 2) null pointer constant 3509 if (FromType->isPointerType()) 3510 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3511 ImpCastExprToType(rExpr, it->getType()); 3512 InitField = *it; 3513 break; 3514 } 3515 3516 if (rExpr->isNullPointerConstant(Context)) { 3517 ImpCastExprToType(rExpr, it->getType()); 3518 InitField = *it; 3519 break; 3520 } 3521 } 3522 3523 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3524 == Compatible) { 3525 InitField = *it; 3526 break; 3527 } 3528 } 3529 3530 if (!InitField) 3531 return Incompatible; 3532 3533 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3534 return Compatible; 3535} 3536 3537Sema::AssignConvertType 3538Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3539 if (getLangOptions().CPlusPlus) { 3540 if (!lhsType->isRecordType()) { 3541 // C++ 5.17p3: If the left operand is not of class type, the 3542 // expression is implicitly converted (C++ 4) to the 3543 // cv-unqualified type of the left operand. 3544 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3545 "assigning")) 3546 return Incompatible; 3547 return Compatible; 3548 } 3549 3550 // FIXME: Currently, we fall through and treat C++ classes like C 3551 // structures. 3552 } 3553 3554 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3555 // a null pointer constant. 3556 if ((lhsType->isPointerType() || 3557 lhsType->isObjCQualifiedIdType() || 3558 lhsType->isBlockPointerType()) 3559 && rExpr->isNullPointerConstant(Context)) { 3560 ImpCastExprToType(rExpr, lhsType); 3561 return Compatible; 3562 } 3563 3564 // This check seems unnatural, however it is necessary to ensure the proper 3565 // conversion of functions/arrays. If the conversion were done for all 3566 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3567 // expressions that surpress this implicit conversion (&, sizeof). 3568 // 3569 // Suppress this for references: C++ 8.5.3p5. 3570 if (!lhsType->isReferenceType()) 3571 DefaultFunctionArrayConversion(rExpr); 3572 3573 Sema::AssignConvertType result = 3574 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3575 3576 // C99 6.5.16.1p2: The value of the right operand is converted to the 3577 // type of the assignment expression. 3578 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3579 // so that we can use references in built-in functions even in C. 3580 // The getNonReferenceType() call makes sure that the resulting expression 3581 // does not have reference type. 3582 if (result != Incompatible && rExpr->getType() != lhsType) 3583 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3584 return result; 3585} 3586 3587QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3588 Diag(Loc, diag::err_typecheck_invalid_operands) 3589 << lex->getType() << rex->getType() 3590 << lex->getSourceRange() << rex->getSourceRange(); 3591 return QualType(); 3592} 3593 3594inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3595 Expr *&rex) { 3596 // For conversion purposes, we ignore any qualifiers. 3597 // For example, "const float" and "float" are equivalent. 3598 QualType lhsType = 3599 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3600 QualType rhsType = 3601 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3602 3603 // If the vector types are identical, return. 3604 if (lhsType == rhsType) 3605 return lhsType; 3606 3607 // Handle the case of a vector & extvector type of the same size and element 3608 // type. It would be nice if we only had one vector type someday. 3609 if (getLangOptions().LaxVectorConversions) { 3610 // FIXME: Should we warn here? 3611 if (const VectorType *LV = lhsType->getAsVectorType()) { 3612 if (const VectorType *RV = rhsType->getAsVectorType()) 3613 if (LV->getElementType() == RV->getElementType() && 3614 LV->getNumElements() == RV->getNumElements()) { 3615 return lhsType->isExtVectorType() ? lhsType : rhsType; 3616 } 3617 } 3618 } 3619
| 3577 it != itend; ++it) { 3578 if (it->getType()->isPointerType()) { 3579 // If the transparent union contains a pointer type, we allow: 3580 // 1) void pointer 3581 // 2) null pointer constant 3582 if (FromType->isPointerType()) 3583 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3584 ImpCastExprToType(rExpr, it->getType()); 3585 InitField = *it; 3586 break; 3587 } 3588 3589 if (rExpr->isNullPointerConstant(Context)) { 3590 ImpCastExprToType(rExpr, it->getType()); 3591 InitField = *it; 3592 break; 3593 } 3594 } 3595 3596 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3597 == Compatible) { 3598 InitField = *it; 3599 break; 3600 } 3601 } 3602 3603 if (!InitField) 3604 return Incompatible; 3605 3606 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3607 return Compatible; 3608} 3609 3610Sema::AssignConvertType 3611Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3612 if (getLangOptions().CPlusPlus) { 3613 if (!lhsType->isRecordType()) { 3614 // C++ 5.17p3: If the left operand is not of class type, the 3615 // expression is implicitly converted (C++ 4) to the 3616 // cv-unqualified type of the left operand. 3617 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3618 "assigning")) 3619 return Incompatible; 3620 return Compatible; 3621 } 3622 3623 // FIXME: Currently, we fall through and treat C++ classes like C 3624 // structures. 3625 } 3626 3627 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3628 // a null pointer constant. 3629 if ((lhsType->isPointerType() || 3630 lhsType->isObjCQualifiedIdType() || 3631 lhsType->isBlockPointerType()) 3632 && rExpr->isNullPointerConstant(Context)) { 3633 ImpCastExprToType(rExpr, lhsType); 3634 return Compatible; 3635 } 3636 3637 // This check seems unnatural, however it is necessary to ensure the proper 3638 // conversion of functions/arrays. If the conversion were done for all 3639 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3640 // expressions that surpress this implicit conversion (&, sizeof). 3641 // 3642 // Suppress this for references: C++ 8.5.3p5. 3643 if (!lhsType->isReferenceType()) 3644 DefaultFunctionArrayConversion(rExpr); 3645 3646 Sema::AssignConvertType result = 3647 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3648 3649 // C99 6.5.16.1p2: The value of the right operand is converted to the 3650 // type of the assignment expression. 3651 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3652 // so that we can use references in built-in functions even in C. 3653 // The getNonReferenceType() call makes sure that the resulting expression 3654 // does not have reference type. 3655 if (result != Incompatible && rExpr->getType() != lhsType) 3656 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3657 return result; 3658} 3659 3660QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3661 Diag(Loc, diag::err_typecheck_invalid_operands) 3662 << lex->getType() << rex->getType() 3663 << lex->getSourceRange() << rex->getSourceRange(); 3664 return QualType(); 3665} 3666 3667inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3668 Expr *&rex) { 3669 // For conversion purposes, we ignore any qualifiers. 3670 // For example, "const float" and "float" are equivalent. 3671 QualType lhsType = 3672 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3673 QualType rhsType = 3674 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3675 3676 // If the vector types are identical, return. 3677 if (lhsType == rhsType) 3678 return lhsType; 3679 3680 // Handle the case of a vector & extvector type of the same size and element 3681 // type. It would be nice if we only had one vector type someday. 3682 if (getLangOptions().LaxVectorConversions) { 3683 // FIXME: Should we warn here? 3684 if (const VectorType *LV = lhsType->getAsVectorType()) { 3685 if (const VectorType *RV = rhsType->getAsVectorType()) 3686 if (LV->getElementType() == RV->getElementType() && 3687 LV->getNumElements() == RV->getNumElements()) { 3688 return lhsType->isExtVectorType() ? lhsType : rhsType; 3689 } 3690 } 3691 } 3692
|
3620 // If the lhs is an extended vector and the rhs is a scalar of the same type 3621 // or a literal, promote the rhs to the vector type. 3622 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3623 QualType eltType = V->getElementType(); 3624 3625 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3626 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3627 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3628 ImpCastExprToType(rex, lhsType); 3629 return lhsType; 3630 }
| 3693 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 3694 // swap back (so that we don't reverse the inputs to a subtract, for instance. 3695 bool swapped = false; 3696 if (rhsType->isExtVectorType()) { 3697 swapped = true; 3698 std::swap(rex, lex); 3699 std::swap(rhsType, lhsType);
|
3631 }
| 3700 }
|
3632 3633 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3634 // promote the lhs to the vector type. 3635 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3636 QualType eltType = V->getElementType(); 3637 3638 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3639 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3640 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3641 ImpCastExprToType(lex, rhsType); 3642 return rhsType;
| 3701 3702 // Handle the case of an ext vector and scalar. 3703 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 3704 QualType EltTy = LV->getElementType(); 3705 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 3706 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 3707 ImpCastExprToType(rex, lhsType); 3708 if (swapped) std::swap(rex, lex); 3709 return lhsType; 3710 }
|
3643 }
| 3711 }
|
| 3712 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 3713 rhsType->isRealFloatingType()) { 3714 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 3715 ImpCastExprToType(rex, lhsType); 3716 if (swapped) std::swap(rex, lex); 3717 return lhsType; 3718 } 3719 }
|
3644 }
| 3720 }
|
3645 3646 // You cannot convert between vector values of different size.
| 3721 3722 // Vectors of different size or scalar and non-ext-vector are errors.
|
3647 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3648 << lex->getType() << rex->getType() 3649 << lex->getSourceRange() << rex->getSourceRange(); 3650 return QualType(); 3651} 3652 3653inline QualType Sema::CheckMultiplyDivideOperands( 3654 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3655{ 3656 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3657 return CheckVectorOperands(Loc, lex, rex); 3658 3659 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3660 3661 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3662 return compType; 3663 return InvalidOperands(Loc, lex, rex); 3664} 3665 3666inline QualType Sema::CheckRemainderOperands( 3667 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3668{ 3669 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3670 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3671 return CheckVectorOperands(Loc, lex, rex); 3672 return InvalidOperands(Loc, lex, rex); 3673 } 3674 3675 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3676 3677 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3678 return compType; 3679 return InvalidOperands(Loc, lex, rex); 3680} 3681 3682inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3683 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3684{ 3685 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3686 QualType compType = CheckVectorOperands(Loc, lex, rex); 3687 if (CompLHSTy) *CompLHSTy = compType; 3688 return compType; 3689 } 3690 3691 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3692 3693 // handle the common case first (both operands are arithmetic). 3694 if (lex->getType()->isArithmeticType() && 3695 rex->getType()->isArithmeticType()) { 3696 if (CompLHSTy) *CompLHSTy = compType; 3697 return compType; 3698 } 3699 3700 // Put any potential pointer into PExp 3701 Expr* PExp = lex, *IExp = rex; 3702 if (IExp->getType()->isPointerType()) 3703 std::swap(PExp, IExp); 3704 3705 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3706 if (IExp->getType()->isIntegerType()) { 3707 QualType PointeeTy = PTy->getPointeeType(); 3708 // Check for arithmetic on pointers to incomplete types. 3709 if (PointeeTy->isVoidType()) { 3710 if (getLangOptions().CPlusPlus) { 3711 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3712 << lex->getSourceRange() << rex->getSourceRange(); 3713 return QualType(); 3714 } 3715 3716 // GNU extension: arithmetic on pointer to void 3717 Diag(Loc, diag::ext_gnu_void_ptr) 3718 << lex->getSourceRange() << rex->getSourceRange(); 3719 } else if (PointeeTy->isFunctionType()) { 3720 if (getLangOptions().CPlusPlus) { 3721 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3722 << lex->getType() << lex->getSourceRange(); 3723 return QualType(); 3724 } 3725 3726 // GNU extension: arithmetic on pointer to function 3727 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3728 << lex->getType() << lex->getSourceRange(); 3729 } else if (!PTy->isDependentType() && 3730 RequireCompleteType(Loc, PointeeTy, 3731 diag::err_typecheck_arithmetic_incomplete_type, 3732 PExp->getSourceRange(), SourceRange(), 3733 PExp->getType())) 3734 return QualType(); 3735 3736 // Diagnose bad cases where we step over interface counts. 3737 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3738 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3739 << PointeeTy << PExp->getSourceRange(); 3740 return QualType(); 3741 } 3742 3743 if (CompLHSTy) { 3744 QualType LHSTy = lex->getType(); 3745 if (LHSTy->isPromotableIntegerType()) 3746 LHSTy = Context.IntTy; 3747 else { 3748 QualType T = isPromotableBitField(lex, Context); 3749 if (!T.isNull()) 3750 LHSTy = T; 3751 } 3752 3753 *CompLHSTy = LHSTy; 3754 } 3755 return PExp->getType(); 3756 } 3757 } 3758 3759 return InvalidOperands(Loc, lex, rex); 3760} 3761 3762// C99 6.5.6 3763QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3764 SourceLocation Loc, QualType* CompLHSTy) { 3765 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3766 QualType compType = CheckVectorOperands(Loc, lex, rex); 3767 if (CompLHSTy) *CompLHSTy = compType; 3768 return compType; 3769 } 3770 3771 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3772 3773 // Enforce type constraints: C99 6.5.6p3. 3774 3775 // Handle the common case first (both operands are arithmetic). 3776 if (lex->getType()->isArithmeticType() 3777 && rex->getType()->isArithmeticType()) { 3778 if (CompLHSTy) *CompLHSTy = compType; 3779 return compType; 3780 } 3781 3782 // Either ptr - int or ptr - ptr. 3783 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3784 QualType lpointee = LHSPTy->getPointeeType(); 3785 3786 // The LHS must be an completely-defined object type. 3787 3788 bool ComplainAboutVoid = false; 3789 Expr *ComplainAboutFunc = 0; 3790 if (lpointee->isVoidType()) { 3791 if (getLangOptions().CPlusPlus) { 3792 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3793 << lex->getSourceRange() << rex->getSourceRange(); 3794 return QualType(); 3795 } 3796 3797 // GNU C extension: arithmetic on pointer to void 3798 ComplainAboutVoid = true; 3799 } else if (lpointee->isFunctionType()) { 3800 if (getLangOptions().CPlusPlus) { 3801 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3802 << lex->getType() << lex->getSourceRange(); 3803 return QualType(); 3804 } 3805 3806 // GNU C extension: arithmetic on pointer to function 3807 ComplainAboutFunc = lex; 3808 } else if (!lpointee->isDependentType() && 3809 RequireCompleteType(Loc, lpointee, 3810 diag::err_typecheck_sub_ptr_object, 3811 lex->getSourceRange(), 3812 SourceRange(), 3813 lex->getType())) 3814 return QualType(); 3815 3816 // Diagnose bad cases where we step over interface counts. 3817 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3818 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3819 << lpointee << lex->getSourceRange(); 3820 return QualType(); 3821 } 3822 3823 // The result type of a pointer-int computation is the pointer type. 3824 if (rex->getType()->isIntegerType()) { 3825 if (ComplainAboutVoid) 3826 Diag(Loc, diag::ext_gnu_void_ptr) 3827 << lex->getSourceRange() << rex->getSourceRange(); 3828 if (ComplainAboutFunc) 3829 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3830 << ComplainAboutFunc->getType() 3831 << ComplainAboutFunc->getSourceRange(); 3832 3833 if (CompLHSTy) *CompLHSTy = lex->getType(); 3834 return lex->getType(); 3835 } 3836 3837 // Handle pointer-pointer subtractions. 3838 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3839 QualType rpointee = RHSPTy->getPointeeType(); 3840 3841 // RHS must be a completely-type object type. 3842 // Handle the GNU void* extension. 3843 if (rpointee->isVoidType()) { 3844 if (getLangOptions().CPlusPlus) { 3845 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3846 << lex->getSourceRange() << rex->getSourceRange(); 3847 return QualType(); 3848 } 3849 3850 ComplainAboutVoid = true; 3851 } else if (rpointee->isFunctionType()) { 3852 if (getLangOptions().CPlusPlus) { 3853 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3854 << rex->getType() << rex->getSourceRange(); 3855 return QualType(); 3856 } 3857 3858 // GNU extension: arithmetic on pointer to function 3859 if (!ComplainAboutFunc) 3860 ComplainAboutFunc = rex; 3861 } else if (!rpointee->isDependentType() && 3862 RequireCompleteType(Loc, rpointee, 3863 diag::err_typecheck_sub_ptr_object, 3864 rex->getSourceRange(), 3865 SourceRange(), 3866 rex->getType())) 3867 return QualType(); 3868 3869 if (getLangOptions().CPlusPlus) { 3870 // Pointee types must be the same: C++ [expr.add] 3871 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3872 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3873 << lex->getType() << rex->getType() 3874 << lex->getSourceRange() << rex->getSourceRange(); 3875 return QualType(); 3876 } 3877 } else { 3878 // Pointee types must be compatible C99 6.5.6p3 3879 if (!Context.typesAreCompatible( 3880 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3881 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3882 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3883 << lex->getType() << rex->getType() 3884 << lex->getSourceRange() << rex->getSourceRange(); 3885 return QualType(); 3886 } 3887 } 3888 3889 if (ComplainAboutVoid) 3890 Diag(Loc, diag::ext_gnu_void_ptr) 3891 << lex->getSourceRange() << rex->getSourceRange(); 3892 if (ComplainAboutFunc) 3893 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3894 << ComplainAboutFunc->getType() 3895 << ComplainAboutFunc->getSourceRange(); 3896 3897 if (CompLHSTy) *CompLHSTy = lex->getType(); 3898 return Context.getPointerDiffType(); 3899 } 3900 } 3901 3902 return InvalidOperands(Loc, lex, rex); 3903} 3904 3905// C99 6.5.7 3906QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3907 bool isCompAssign) { 3908 // C99 6.5.7p2: Each of the operands shall have integer type. 3909 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3910 return InvalidOperands(Loc, lex, rex); 3911 3912 // Shifts don't perform usual arithmetic conversions, they just do integer 3913 // promotions on each operand. C99 6.5.7p3 3914 QualType LHSTy; 3915 if (lex->getType()->isPromotableIntegerType()) 3916 LHSTy = Context.IntTy; 3917 else { 3918 LHSTy = isPromotableBitField(lex, Context); 3919 if (LHSTy.isNull()) 3920 LHSTy = lex->getType(); 3921 } 3922 if (!isCompAssign) 3923 ImpCastExprToType(lex, LHSTy); 3924 3925 UsualUnaryConversions(rex); 3926 3927 // "The type of the result is that of the promoted left operand." 3928 return LHSTy; 3929} 3930 3931// C99 6.5.8, C++ [expr.rel] 3932QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3933 unsigned OpaqueOpc, bool isRelational) { 3934 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3935 3936 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3937 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3938 3939 // C99 6.5.8p3 / C99 6.5.9p4 3940 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3941 UsualArithmeticConversions(lex, rex); 3942 else { 3943 UsualUnaryConversions(lex); 3944 UsualUnaryConversions(rex); 3945 } 3946 QualType lType = lex->getType(); 3947 QualType rType = rex->getType(); 3948 3949 if (!lType->isFloatingType() 3950 && !(lType->isBlockPointerType() && isRelational)) { 3951 // For non-floating point types, check for self-comparisons of the form 3952 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3953 // often indicate logic errors in the program. 3954 // NOTE: Don't warn about comparisons of enum constants. These can arise 3955 // from macro expansions, and are usually quite deliberate. 3956 Expr *LHSStripped = lex->IgnoreParens(); 3957 Expr *RHSStripped = rex->IgnoreParens(); 3958 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3959 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3960 if (DRL->getDecl() == DRR->getDecl() && 3961 !isa<EnumConstantDecl>(DRL->getDecl())) 3962 Diag(Loc, diag::warn_selfcomparison); 3963 3964 if (isa<CastExpr>(LHSStripped)) 3965 LHSStripped = LHSStripped->IgnoreParenCasts(); 3966 if (isa<CastExpr>(RHSStripped)) 3967 RHSStripped = RHSStripped->IgnoreParenCasts(); 3968 3969 // Warn about comparisons against a string constant (unless the other 3970 // operand is null), the user probably wants strcmp. 3971 Expr *literalString = 0; 3972 Expr *literalStringStripped = 0; 3973 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3974 !RHSStripped->isNullPointerConstant(Context)) { 3975 literalString = lex; 3976 literalStringStripped = LHSStripped; 3977 } 3978 else if ((isa<StringLiteral>(RHSStripped) || 3979 isa<ObjCEncodeExpr>(RHSStripped)) && 3980 !LHSStripped->isNullPointerConstant(Context)) { 3981 literalString = rex; 3982 literalStringStripped = RHSStripped; 3983 } 3984 3985 if (literalString) { 3986 std::string resultComparison; 3987 switch (Opc) { 3988 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3989 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3990 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3991 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3992 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3993 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3994 default: assert(false && "Invalid comparison operator"); 3995 } 3996 Diag(Loc, diag::warn_stringcompare) 3997 << isa<ObjCEncodeExpr>(literalStringStripped) 3998 << literalString->getSourceRange() 3999 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4000 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4001 "strcmp(") 4002 << CodeModificationHint::CreateInsertion( 4003 PP.getLocForEndOfToken(rex->getLocEnd()), 4004 resultComparison); 4005 } 4006 } 4007 4008 // The result of comparisons is 'bool' in C++, 'int' in C. 4009 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4010 4011 if (isRelational) { 4012 if (lType->isRealType() && rType->isRealType()) 4013 return ResultTy; 4014 } else { 4015 // Check for comparisons of floating point operands using != and ==. 4016 if (lType->isFloatingType()) { 4017 assert(rType->isFloatingType()); 4018 CheckFloatComparison(Loc,lex,rex); 4019 } 4020 4021 if (lType->isArithmeticType() && rType->isArithmeticType()) 4022 return ResultTy; 4023 } 4024 4025 bool LHSIsNull = lex->isNullPointerConstant(Context); 4026 bool RHSIsNull = rex->isNullPointerConstant(Context); 4027 4028 // All of the following pointer related warnings are GCC extensions, except 4029 // when handling null pointer constants. One day, we can consider making them 4030 // errors (when -pedantic-errors is enabled). 4031 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4032 QualType LCanPointeeTy = 4033 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 4034 QualType RCanPointeeTy = 4035 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 4036
| 3723 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3724 << lex->getType() << rex->getType() 3725 << lex->getSourceRange() << rex->getSourceRange(); 3726 return QualType(); 3727} 3728 3729inline QualType Sema::CheckMultiplyDivideOperands( 3730 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3731{ 3732 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3733 return CheckVectorOperands(Loc, lex, rex); 3734 3735 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3736 3737 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3738 return compType; 3739 return InvalidOperands(Loc, lex, rex); 3740} 3741 3742inline QualType Sema::CheckRemainderOperands( 3743 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3744{ 3745 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3746 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3747 return CheckVectorOperands(Loc, lex, rex); 3748 return InvalidOperands(Loc, lex, rex); 3749 } 3750 3751 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3752 3753 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3754 return compType; 3755 return InvalidOperands(Loc, lex, rex); 3756} 3757 3758inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3759 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3760{ 3761 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3762 QualType compType = CheckVectorOperands(Loc, lex, rex); 3763 if (CompLHSTy) *CompLHSTy = compType; 3764 return compType; 3765 } 3766 3767 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3768 3769 // handle the common case first (both operands are arithmetic). 3770 if (lex->getType()->isArithmeticType() && 3771 rex->getType()->isArithmeticType()) { 3772 if (CompLHSTy) *CompLHSTy = compType; 3773 return compType; 3774 } 3775 3776 // Put any potential pointer into PExp 3777 Expr* PExp = lex, *IExp = rex; 3778 if (IExp->getType()->isPointerType()) 3779 std::swap(PExp, IExp); 3780 3781 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3782 if (IExp->getType()->isIntegerType()) { 3783 QualType PointeeTy = PTy->getPointeeType(); 3784 // Check for arithmetic on pointers to incomplete types. 3785 if (PointeeTy->isVoidType()) { 3786 if (getLangOptions().CPlusPlus) { 3787 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3788 << lex->getSourceRange() << rex->getSourceRange(); 3789 return QualType(); 3790 } 3791 3792 // GNU extension: arithmetic on pointer to void 3793 Diag(Loc, diag::ext_gnu_void_ptr) 3794 << lex->getSourceRange() << rex->getSourceRange(); 3795 } else if (PointeeTy->isFunctionType()) { 3796 if (getLangOptions().CPlusPlus) { 3797 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3798 << lex->getType() << lex->getSourceRange(); 3799 return QualType(); 3800 } 3801 3802 // GNU extension: arithmetic on pointer to function 3803 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3804 << lex->getType() << lex->getSourceRange(); 3805 } else if (!PTy->isDependentType() && 3806 RequireCompleteType(Loc, PointeeTy, 3807 diag::err_typecheck_arithmetic_incomplete_type, 3808 PExp->getSourceRange(), SourceRange(), 3809 PExp->getType())) 3810 return QualType(); 3811 3812 // Diagnose bad cases where we step over interface counts. 3813 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3814 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3815 << PointeeTy << PExp->getSourceRange(); 3816 return QualType(); 3817 } 3818 3819 if (CompLHSTy) { 3820 QualType LHSTy = lex->getType(); 3821 if (LHSTy->isPromotableIntegerType()) 3822 LHSTy = Context.IntTy; 3823 else { 3824 QualType T = isPromotableBitField(lex, Context); 3825 if (!T.isNull()) 3826 LHSTy = T; 3827 } 3828 3829 *CompLHSTy = LHSTy; 3830 } 3831 return PExp->getType(); 3832 } 3833 } 3834 3835 return InvalidOperands(Loc, lex, rex); 3836} 3837 3838// C99 6.5.6 3839QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3840 SourceLocation Loc, QualType* CompLHSTy) { 3841 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3842 QualType compType = CheckVectorOperands(Loc, lex, rex); 3843 if (CompLHSTy) *CompLHSTy = compType; 3844 return compType; 3845 } 3846 3847 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3848 3849 // Enforce type constraints: C99 6.5.6p3. 3850 3851 // Handle the common case first (both operands are arithmetic). 3852 if (lex->getType()->isArithmeticType() 3853 && rex->getType()->isArithmeticType()) { 3854 if (CompLHSTy) *CompLHSTy = compType; 3855 return compType; 3856 } 3857 3858 // Either ptr - int or ptr - ptr. 3859 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3860 QualType lpointee = LHSPTy->getPointeeType(); 3861 3862 // The LHS must be an completely-defined object type. 3863 3864 bool ComplainAboutVoid = false; 3865 Expr *ComplainAboutFunc = 0; 3866 if (lpointee->isVoidType()) { 3867 if (getLangOptions().CPlusPlus) { 3868 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3869 << lex->getSourceRange() << rex->getSourceRange(); 3870 return QualType(); 3871 } 3872 3873 // GNU C extension: arithmetic on pointer to void 3874 ComplainAboutVoid = true; 3875 } else if (lpointee->isFunctionType()) { 3876 if (getLangOptions().CPlusPlus) { 3877 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3878 << lex->getType() << lex->getSourceRange(); 3879 return QualType(); 3880 } 3881 3882 // GNU C extension: arithmetic on pointer to function 3883 ComplainAboutFunc = lex; 3884 } else if (!lpointee->isDependentType() && 3885 RequireCompleteType(Loc, lpointee, 3886 diag::err_typecheck_sub_ptr_object, 3887 lex->getSourceRange(), 3888 SourceRange(), 3889 lex->getType())) 3890 return QualType(); 3891 3892 // Diagnose bad cases where we step over interface counts. 3893 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3894 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3895 << lpointee << lex->getSourceRange(); 3896 return QualType(); 3897 } 3898 3899 // The result type of a pointer-int computation is the pointer type. 3900 if (rex->getType()->isIntegerType()) { 3901 if (ComplainAboutVoid) 3902 Diag(Loc, diag::ext_gnu_void_ptr) 3903 << lex->getSourceRange() << rex->getSourceRange(); 3904 if (ComplainAboutFunc) 3905 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3906 << ComplainAboutFunc->getType() 3907 << ComplainAboutFunc->getSourceRange(); 3908 3909 if (CompLHSTy) *CompLHSTy = lex->getType(); 3910 return lex->getType(); 3911 } 3912 3913 // Handle pointer-pointer subtractions. 3914 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3915 QualType rpointee = RHSPTy->getPointeeType(); 3916 3917 // RHS must be a completely-type object type. 3918 // Handle the GNU void* extension. 3919 if (rpointee->isVoidType()) { 3920 if (getLangOptions().CPlusPlus) { 3921 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3922 << lex->getSourceRange() << rex->getSourceRange(); 3923 return QualType(); 3924 } 3925 3926 ComplainAboutVoid = true; 3927 } else if (rpointee->isFunctionType()) { 3928 if (getLangOptions().CPlusPlus) { 3929 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3930 << rex->getType() << rex->getSourceRange(); 3931 return QualType(); 3932 } 3933 3934 // GNU extension: arithmetic on pointer to function 3935 if (!ComplainAboutFunc) 3936 ComplainAboutFunc = rex; 3937 } else if (!rpointee->isDependentType() && 3938 RequireCompleteType(Loc, rpointee, 3939 diag::err_typecheck_sub_ptr_object, 3940 rex->getSourceRange(), 3941 SourceRange(), 3942 rex->getType())) 3943 return QualType(); 3944 3945 if (getLangOptions().CPlusPlus) { 3946 // Pointee types must be the same: C++ [expr.add] 3947 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3948 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3949 << lex->getType() << rex->getType() 3950 << lex->getSourceRange() << rex->getSourceRange(); 3951 return QualType(); 3952 } 3953 } else { 3954 // Pointee types must be compatible C99 6.5.6p3 3955 if (!Context.typesAreCompatible( 3956 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3957 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3958 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3959 << lex->getType() << rex->getType() 3960 << lex->getSourceRange() << rex->getSourceRange(); 3961 return QualType(); 3962 } 3963 } 3964 3965 if (ComplainAboutVoid) 3966 Diag(Loc, diag::ext_gnu_void_ptr) 3967 << lex->getSourceRange() << rex->getSourceRange(); 3968 if (ComplainAboutFunc) 3969 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3970 << ComplainAboutFunc->getType() 3971 << ComplainAboutFunc->getSourceRange(); 3972 3973 if (CompLHSTy) *CompLHSTy = lex->getType(); 3974 return Context.getPointerDiffType(); 3975 } 3976 } 3977 3978 return InvalidOperands(Loc, lex, rex); 3979} 3980 3981// C99 6.5.7 3982QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3983 bool isCompAssign) { 3984 // C99 6.5.7p2: Each of the operands shall have integer type. 3985 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3986 return InvalidOperands(Loc, lex, rex); 3987 3988 // Shifts don't perform usual arithmetic conversions, they just do integer 3989 // promotions on each operand. C99 6.5.7p3 3990 QualType LHSTy; 3991 if (lex->getType()->isPromotableIntegerType()) 3992 LHSTy = Context.IntTy; 3993 else { 3994 LHSTy = isPromotableBitField(lex, Context); 3995 if (LHSTy.isNull()) 3996 LHSTy = lex->getType(); 3997 } 3998 if (!isCompAssign) 3999 ImpCastExprToType(lex, LHSTy); 4000 4001 UsualUnaryConversions(rex); 4002 4003 // "The type of the result is that of the promoted left operand." 4004 return LHSTy; 4005} 4006 4007// C99 6.5.8, C++ [expr.rel] 4008QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4009 unsigned OpaqueOpc, bool isRelational) { 4010 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4011 4012 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4013 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4014 4015 // C99 6.5.8p3 / C99 6.5.9p4 4016 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4017 UsualArithmeticConversions(lex, rex); 4018 else { 4019 UsualUnaryConversions(lex); 4020 UsualUnaryConversions(rex); 4021 } 4022 QualType lType = lex->getType(); 4023 QualType rType = rex->getType(); 4024 4025 if (!lType->isFloatingType() 4026 && !(lType->isBlockPointerType() && isRelational)) { 4027 // For non-floating point types, check for self-comparisons of the form 4028 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4029 // often indicate logic errors in the program. 4030 // NOTE: Don't warn about comparisons of enum constants. These can arise 4031 // from macro expansions, and are usually quite deliberate. 4032 Expr *LHSStripped = lex->IgnoreParens(); 4033 Expr *RHSStripped = rex->IgnoreParens(); 4034 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4035 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4036 if (DRL->getDecl() == DRR->getDecl() && 4037 !isa<EnumConstantDecl>(DRL->getDecl())) 4038 Diag(Loc, diag::warn_selfcomparison); 4039 4040 if (isa<CastExpr>(LHSStripped)) 4041 LHSStripped = LHSStripped->IgnoreParenCasts(); 4042 if (isa<CastExpr>(RHSStripped)) 4043 RHSStripped = RHSStripped->IgnoreParenCasts(); 4044 4045 // Warn about comparisons against a string constant (unless the other 4046 // operand is null), the user probably wants strcmp. 4047 Expr *literalString = 0; 4048 Expr *literalStringStripped = 0; 4049 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4050 !RHSStripped->isNullPointerConstant(Context)) { 4051 literalString = lex; 4052 literalStringStripped = LHSStripped; 4053 } 4054 else if ((isa<StringLiteral>(RHSStripped) || 4055 isa<ObjCEncodeExpr>(RHSStripped)) && 4056 !LHSStripped->isNullPointerConstant(Context)) { 4057 literalString = rex; 4058 literalStringStripped = RHSStripped; 4059 } 4060 4061 if (literalString) { 4062 std::string resultComparison; 4063 switch (Opc) { 4064 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4065 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4066 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4067 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4068 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4069 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4070 default: assert(false && "Invalid comparison operator"); 4071 } 4072 Diag(Loc, diag::warn_stringcompare) 4073 << isa<ObjCEncodeExpr>(literalStringStripped) 4074 << literalString->getSourceRange() 4075 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4076 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4077 "strcmp(") 4078 << CodeModificationHint::CreateInsertion( 4079 PP.getLocForEndOfToken(rex->getLocEnd()), 4080 resultComparison); 4081 } 4082 } 4083 4084 // The result of comparisons is 'bool' in C++, 'int' in C. 4085 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4086 4087 if (isRelational) { 4088 if (lType->isRealType() && rType->isRealType()) 4089 return ResultTy; 4090 } else { 4091 // Check for comparisons of floating point operands using != and ==. 4092 if (lType->isFloatingType()) { 4093 assert(rType->isFloatingType()); 4094 CheckFloatComparison(Loc,lex,rex); 4095 } 4096 4097 if (lType->isArithmeticType() && rType->isArithmeticType()) 4098 return ResultTy; 4099 } 4100 4101 bool LHSIsNull = lex->isNullPointerConstant(Context); 4102 bool RHSIsNull = rex->isNullPointerConstant(Context); 4103 4104 // All of the following pointer related warnings are GCC extensions, except 4105 // when handling null pointer constants. One day, we can consider making them 4106 // errors (when -pedantic-errors is enabled). 4107 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4108 QualType LCanPointeeTy = 4109 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 4110 QualType RCanPointeeTy = 4111 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 4112
|
| 4113 if (rType->isFunctionPointerType() || lType->isFunctionPointerType()) { 4114 if (isRelational) { 4115 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4116 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4117 } 4118 } 4119 if (((!LHSIsNull || isRelational) && LCanPointeeTy->isVoidType()) != 4120 ((!RHSIsNull || isRelational) && RCanPointeeTy->isVoidType())) { 4121 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4122 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4123 }
|
4037 // Simple check: if the pointee types are identical, we're done. 4038 if (LCanPointeeTy == RCanPointeeTy) 4039 return ResultTy; 4040 4041 if (getLangOptions().CPlusPlus) { 4042 // C++ [expr.rel]p2: 4043 // [...] Pointer conversions (4.10) and qualification 4044 // conversions (4.4) are performed on pointer operands (or on 4045 // a pointer operand and a null pointer constant) to bring 4046 // them to their composite pointer type. [...] 4047 // 4048 // C++ [expr.eq]p2 uses the same notion for (in)equality 4049 // comparisons of pointers. 4050 QualType T = FindCompositePointerType(lex, rex); 4051 if (T.isNull()) { 4052 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4053 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4054 return QualType(); 4055 } 4056 4057 ImpCastExprToType(lex, T); 4058 ImpCastExprToType(rex, T); 4059 return ResultTy; 4060 } 4061 4062 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 4063 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 4064 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4065 RCanPointeeTy.getUnqualifiedType()) && 4066 !Context.areComparableObjCPointerTypes(lType, rType)) { 4067 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4068 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4069 } 4070 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4071 return ResultTy; 4072 } 4073 // C++ allows comparison of pointers with null pointer constants. 4074 if (getLangOptions().CPlusPlus) { 4075 if (lType->isPointerType() && RHSIsNull) { 4076 ImpCastExprToType(rex, lType); 4077 return ResultTy; 4078 } 4079 if (rType->isPointerType() && LHSIsNull) { 4080 ImpCastExprToType(lex, rType); 4081 return ResultTy; 4082 } 4083 // And comparison of nullptr_t with itself. 4084 if (lType->isNullPtrType() && rType->isNullPtrType()) 4085 return ResultTy; 4086 } 4087 // Handle block pointer types. 4088 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4089 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4090 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4091 4092 if (!LHSIsNull && !RHSIsNull && 4093 !Context.typesAreCompatible(lpointee, rpointee)) { 4094 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4095 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4096 } 4097 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4098 return ResultTy; 4099 } 4100 // Allow block pointers to be compared with null pointer constants. 4101 if (!isRelational 4102 && ((lType->isBlockPointerType() && rType->isPointerType()) 4103 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4104 if (!LHSIsNull && !RHSIsNull) { 4105 if (!((rType->isPointerType() && rType->getAsPointerType() 4106 ->getPointeeType()->isVoidType()) 4107 || (lType->isPointerType() && lType->getAsPointerType() 4108 ->getPointeeType()->isVoidType()))) 4109 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4110 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4111 } 4112 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4113 return ResultTy; 4114 } 4115 4116 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4117 if (lType->isPointerType() || rType->isPointerType()) { 4118 const PointerType *LPT = lType->getAsPointerType(); 4119 const PointerType *RPT = rType->getAsPointerType(); 4120 bool LPtrToVoid = LPT ? 4121 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4122 bool RPtrToVoid = RPT ? 4123 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4124 4125 if (!LPtrToVoid && !RPtrToVoid && 4126 !Context.typesAreCompatible(lType, rType)) { 4127 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4128 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4129 ImpCastExprToType(rex, lType); 4130 return ResultTy; 4131 } 4132 ImpCastExprToType(rex, lType); 4133 return ResultTy; 4134 } 4135 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4136 ImpCastExprToType(rex, lType); 4137 return ResultTy; 4138 } else { 4139 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4140 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4141 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4142 ImpCastExprToType(rex, lType); 4143 return ResultTy; 4144 } 4145 } 4146 } 4147 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4148 rType->isIntegerType()) {
| 4124 // Simple check: if the pointee types are identical, we're done. 4125 if (LCanPointeeTy == RCanPointeeTy) 4126 return ResultTy; 4127 4128 if (getLangOptions().CPlusPlus) { 4129 // C++ [expr.rel]p2: 4130 // [...] Pointer conversions (4.10) and qualification 4131 // conversions (4.4) are performed on pointer operands (or on 4132 // a pointer operand and a null pointer constant) to bring 4133 // them to their composite pointer type. [...] 4134 // 4135 // C++ [expr.eq]p2 uses the same notion for (in)equality 4136 // comparisons of pointers. 4137 QualType T = FindCompositePointerType(lex, rex); 4138 if (T.isNull()) { 4139 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4140 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4141 return QualType(); 4142 } 4143 4144 ImpCastExprToType(lex, T); 4145 ImpCastExprToType(rex, T); 4146 return ResultTy; 4147 } 4148 4149 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 4150 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 4151 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4152 RCanPointeeTy.getUnqualifiedType()) && 4153 !Context.areComparableObjCPointerTypes(lType, rType)) { 4154 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4155 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4156 } 4157 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4158 return ResultTy; 4159 } 4160 // C++ allows comparison of pointers with null pointer constants. 4161 if (getLangOptions().CPlusPlus) { 4162 if (lType->isPointerType() && RHSIsNull) { 4163 ImpCastExprToType(rex, lType); 4164 return ResultTy; 4165 } 4166 if (rType->isPointerType() && LHSIsNull) { 4167 ImpCastExprToType(lex, rType); 4168 return ResultTy; 4169 } 4170 // And comparison of nullptr_t with itself. 4171 if (lType->isNullPtrType() && rType->isNullPtrType()) 4172 return ResultTy; 4173 } 4174 // Handle block pointer types. 4175 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4176 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4177 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4178 4179 if (!LHSIsNull && !RHSIsNull && 4180 !Context.typesAreCompatible(lpointee, rpointee)) { 4181 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4182 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4183 } 4184 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4185 return ResultTy; 4186 } 4187 // Allow block pointers to be compared with null pointer constants. 4188 if (!isRelational 4189 && ((lType->isBlockPointerType() && rType->isPointerType()) 4190 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4191 if (!LHSIsNull && !RHSIsNull) { 4192 if (!((rType->isPointerType() && rType->getAsPointerType() 4193 ->getPointeeType()->isVoidType()) 4194 || (lType->isPointerType() && lType->getAsPointerType() 4195 ->getPointeeType()->isVoidType()))) 4196 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4197 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4198 } 4199 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4200 return ResultTy; 4201 } 4202 4203 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4204 if (lType->isPointerType() || rType->isPointerType()) { 4205 const PointerType *LPT = lType->getAsPointerType(); 4206 const PointerType *RPT = rType->getAsPointerType(); 4207 bool LPtrToVoid = LPT ? 4208 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4209 bool RPtrToVoid = RPT ? 4210 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4211 4212 if (!LPtrToVoid && !RPtrToVoid && 4213 !Context.typesAreCompatible(lType, rType)) { 4214 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4215 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4216 ImpCastExprToType(rex, lType); 4217 return ResultTy; 4218 } 4219 ImpCastExprToType(rex, lType); 4220 return ResultTy; 4221 } 4222 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4223 ImpCastExprToType(rex, lType); 4224 return ResultTy; 4225 } else { 4226 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4227 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4228 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4229 ImpCastExprToType(rex, lType); 4230 return ResultTy; 4231 } 4232 } 4233 } 4234 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4235 rType->isIntegerType()) {
|
4149 if (!RHSIsNull)
| 4236 if (isRelational) 4237 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_pointer_integer) 4238 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4239 else if (!RHSIsNull)
|
4150 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4151 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4152 ImpCastExprToType(rex, lType); // promote the integer to pointer 4153 return ResultTy; 4154 } 4155 if (lType->isIntegerType() && 4156 (rType->isPointerType() || rType->isObjCQualifiedIdType())) {
| 4240 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4241 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4242 ImpCastExprToType(rex, lType); // promote the integer to pointer 4243 return ResultTy; 4244 } 4245 if (lType->isIntegerType() && 4246 (rType->isPointerType() || rType->isObjCQualifiedIdType())) {
|
4157 if (!LHSIsNull)
| 4247 if (isRelational) 4248 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_pointer_integer) 4249 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4250 else if (!LHSIsNull)
|
4158 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4159 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4160 ImpCastExprToType(lex, rType); // promote the integer to pointer 4161 return ResultTy; 4162 } 4163 // Handle block pointers. 4164 if (!isRelational && RHSIsNull 4165 && lType->isBlockPointerType() && rType->isIntegerType()) { 4166 ImpCastExprToType(rex, lType); // promote the integer to pointer 4167 return ResultTy; 4168 } 4169 if (!isRelational && LHSIsNull 4170 && lType->isIntegerType() && rType->isBlockPointerType()) { 4171 ImpCastExprToType(lex, rType); // promote the integer to pointer 4172 return ResultTy; 4173 } 4174 return InvalidOperands(Loc, lex, rex); 4175} 4176 4177/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4178/// operates on extended vector types. Instead of producing an IntTy result, 4179/// like a scalar comparison, a vector comparison produces a vector of integer 4180/// types. 4181QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4182 SourceLocation Loc, 4183 bool isRelational) { 4184 // Check to make sure we're operating on vectors of the same type and width, 4185 // Allowing one side to be a scalar of element type. 4186 QualType vType = CheckVectorOperands(Loc, lex, rex); 4187 if (vType.isNull()) 4188 return vType; 4189 4190 QualType lType = lex->getType(); 4191 QualType rType = rex->getType(); 4192 4193 // For non-floating point types, check for self-comparisons of the form 4194 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4195 // often indicate logic errors in the program. 4196 if (!lType->isFloatingType()) { 4197 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4198 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4199 if (DRL->getDecl() == DRR->getDecl()) 4200 Diag(Loc, diag::warn_selfcomparison); 4201 } 4202 4203 // Check for comparisons of floating point operands using != and ==. 4204 if (!isRelational && lType->isFloatingType()) { 4205 assert (rType->isFloatingType()); 4206 CheckFloatComparison(Loc,lex,rex); 4207 } 4208 4209 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4210 // just reject all vector comparisons for now. 4211 if (1) { 4212 Diag(Loc, diag::err_typecheck_vector_comparison) 4213 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4214 return QualType(); 4215 } 4216 4217 // Return the type for the comparison, which is the same as vector type for 4218 // integer vectors, or an integer type of identical size and number of 4219 // elements for floating point vectors. 4220 if (lType->isIntegerType()) 4221 return lType; 4222 4223 const VectorType *VTy = lType->getAsVectorType(); 4224 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4225 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4226 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4227 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4228 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4229 4230 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4231 "Unhandled vector element size in vector compare"); 4232 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4233} 4234 4235inline QualType Sema::CheckBitwiseOperands( 4236 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4237{ 4238 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4239 return CheckVectorOperands(Loc, lex, rex); 4240 4241 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4242 4243 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4244 return compType; 4245 return InvalidOperands(Loc, lex, rex); 4246} 4247 4248inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4249 Expr *&lex, Expr *&rex, SourceLocation Loc) 4250{ 4251 UsualUnaryConversions(lex); 4252 UsualUnaryConversions(rex); 4253 4254 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4255 return Context.IntTy; 4256 return InvalidOperands(Loc, lex, rex); 4257} 4258 4259/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4260/// is a read-only property; return true if so. A readonly property expression 4261/// depends on various declarations and thus must be treated specially. 4262/// 4263static bool IsReadonlyProperty(Expr *E, Sema &S) 4264{ 4265 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4266 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4267 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4268 QualType BaseType = PropExpr->getBase()->getType(); 4269 if (const PointerType *PTy = BaseType->getAsPointerType()) 4270 if (const ObjCInterfaceType *IFTy = 4271 PTy->getPointeeType()->getAsObjCInterfaceType()) 4272 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4273 if (S.isPropertyReadonly(PDecl, IFace)) 4274 return true; 4275 } 4276 } 4277 return false; 4278} 4279 4280/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4281/// emit an error and return true. If so, return false. 4282static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4283 SourceLocation OrigLoc = Loc; 4284 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4285 &Loc); 4286 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4287 IsLV = Expr::MLV_ReadonlyProperty; 4288 if (IsLV == Expr::MLV_Valid) 4289 return false; 4290 4291 unsigned Diag = 0; 4292 bool NeedType = false; 4293 switch (IsLV) { // C99 6.5.16p2 4294 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4295 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4296 case Expr::MLV_ArrayType: 4297 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4298 NeedType = true; 4299 break; 4300 case Expr::MLV_NotObjectType: 4301 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4302 NeedType = true; 4303 break; 4304 case Expr::MLV_LValueCast: 4305 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4306 break; 4307 case Expr::MLV_InvalidExpression: 4308 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4309 break; 4310 case Expr::MLV_IncompleteType: 4311 case Expr::MLV_IncompleteVoidType: 4312 return S.RequireCompleteType(Loc, E->getType(), 4313 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4314 E->getSourceRange()); 4315 case Expr::MLV_DuplicateVectorComponents: 4316 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4317 break; 4318 case Expr::MLV_NotBlockQualified: 4319 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4320 break; 4321 case Expr::MLV_ReadonlyProperty: 4322 Diag = diag::error_readonly_property_assignment; 4323 break; 4324 case Expr::MLV_NoSetterProperty: 4325 Diag = diag::error_nosetter_property_assignment; 4326 break; 4327 } 4328 4329 SourceRange Assign; 4330 if (Loc != OrigLoc) 4331 Assign = SourceRange(OrigLoc, OrigLoc); 4332 if (NeedType) 4333 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4334 else 4335 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4336 return true; 4337} 4338 4339 4340 4341// C99 6.5.16.1 4342QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4343 SourceLocation Loc, 4344 QualType CompoundType) { 4345 // Verify that LHS is a modifiable lvalue, and emit error if not. 4346 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4347 return QualType(); 4348 4349 QualType LHSType = LHS->getType(); 4350 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4351 4352 AssignConvertType ConvTy; 4353 if (CompoundType.isNull()) { 4354 // Simple assignment "x = y". 4355 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4356 // Special case of NSObject attributes on c-style pointer types. 4357 if (ConvTy == IncompatiblePointer && 4358 ((Context.isObjCNSObjectType(LHSType) && 4359 Context.isObjCObjectPointerType(RHSType)) || 4360 (Context.isObjCNSObjectType(RHSType) && 4361 Context.isObjCObjectPointerType(LHSType)))) 4362 ConvTy = Compatible; 4363 4364 // If the RHS is a unary plus or minus, check to see if they = and + are 4365 // right next to each other. If so, the user may have typo'd "x =+ 4" 4366 // instead of "x += 4". 4367 Expr *RHSCheck = RHS; 4368 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4369 RHSCheck = ICE->getSubExpr(); 4370 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4371 if ((UO->getOpcode() == UnaryOperator::Plus || 4372 UO->getOpcode() == UnaryOperator::Minus) && 4373 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4374 // Only if the two operators are exactly adjacent. 4375 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4376 // And there is a space or other character before the subexpr of the 4377 // unary +/-. We don't want to warn on "x=-1". 4378 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4379 UO->getSubExpr()->getLocStart().isFileID()) { 4380 Diag(Loc, diag::warn_not_compound_assign) 4381 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4382 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4383 } 4384 } 4385 } else { 4386 // Compound assignment "x += y" 4387 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4388 } 4389 4390 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4391 RHS, "assigning")) 4392 return QualType(); 4393 4394 // C99 6.5.16p3: The type of an assignment expression is the type of the 4395 // left operand unless the left operand has qualified type, in which case 4396 // it is the unqualified version of the type of the left operand. 4397 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4398 // is converted to the type of the assignment expression (above). 4399 // C++ 5.17p1: the type of the assignment expression is that of its left 4400 // operand. 4401 return LHSType.getUnqualifiedType(); 4402} 4403 4404// C99 6.5.17 4405QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4406 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4407 DefaultFunctionArrayConversion(RHS); 4408 4409 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4410 // incomplete in C++). 4411 4412 return RHS->getType(); 4413} 4414 4415/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4416/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4417QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4418 bool isInc) { 4419 if (Op->isTypeDependent()) 4420 return Context.DependentTy; 4421 4422 QualType ResType = Op->getType(); 4423 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4424 4425 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4426 // Decrement of bool is not allowed. 4427 if (!isInc) { 4428 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4429 return QualType(); 4430 } 4431 // Increment of bool sets it to true, but is deprecated. 4432 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4433 } else if (ResType->isRealType()) { 4434 // OK! 4435 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4436 // C99 6.5.2.4p2, 6.5.6p2 4437 if (PT->getPointeeType()->isVoidType()) { 4438 if (getLangOptions().CPlusPlus) { 4439 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4440 << Op->getSourceRange(); 4441 return QualType(); 4442 } 4443 4444 // Pointer to void is a GNU extension in C. 4445 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4446 } else if (PT->getPointeeType()->isFunctionType()) { 4447 if (getLangOptions().CPlusPlus) { 4448 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4449 << Op->getType() << Op->getSourceRange(); 4450 return QualType(); 4451 } 4452 4453 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4454 << ResType << Op->getSourceRange(); 4455 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4456 diag::err_typecheck_arithmetic_incomplete_type, 4457 Op->getSourceRange(), SourceRange(), 4458 ResType)) 4459 return QualType(); 4460 } else if (ResType->isComplexType()) { 4461 // C99 does not support ++/-- on complex types, we allow as an extension. 4462 Diag(OpLoc, diag::ext_integer_increment_complex) 4463 << ResType << Op->getSourceRange(); 4464 } else { 4465 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4466 << ResType << Op->getSourceRange(); 4467 return QualType(); 4468 } 4469 // At this point, we know we have a real, complex or pointer type. 4470 // Now make sure the operand is a modifiable lvalue. 4471 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4472 return QualType(); 4473 return ResType; 4474} 4475 4476/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4477/// This routine allows us to typecheck complex/recursive expressions 4478/// where the declaration is needed for type checking. We only need to 4479/// handle cases when the expression references a function designator 4480/// or is an lvalue. Here are some examples: 4481/// - &(x) => x 4482/// - &*****f => f for f a function designator. 4483/// - &s.xx => s 4484/// - &s.zz[1].yy -> s, if zz is an array 4485/// - *(x + 1) -> x, if x is an array 4486/// - &"123"[2] -> 0 4487/// - & __real__ x -> x 4488static NamedDecl *getPrimaryDecl(Expr *E) { 4489 switch (E->getStmtClass()) { 4490 case Stmt::DeclRefExprClass: 4491 case Stmt::QualifiedDeclRefExprClass: 4492 return cast<DeclRefExpr>(E)->getDecl(); 4493 case Stmt::MemberExprClass: 4494 // If this is an arrow operator, the address is an offset from 4495 // the base's value, so the object the base refers to is 4496 // irrelevant. 4497 if (cast<MemberExpr>(E)->isArrow()) 4498 return 0; 4499 // Otherwise, the expression refers to a part of the base 4500 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4501 case Stmt::ArraySubscriptExprClass: { 4502 // FIXME: This code shouldn't be necessary! We should catch the implicit 4503 // promotion of register arrays earlier. 4504 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4505 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4506 if (ICE->getSubExpr()->getType()->isArrayType()) 4507 return getPrimaryDecl(ICE->getSubExpr()); 4508 } 4509 return 0; 4510 } 4511 case Stmt::UnaryOperatorClass: { 4512 UnaryOperator *UO = cast<UnaryOperator>(E); 4513 4514 switch(UO->getOpcode()) { 4515 case UnaryOperator::Real: 4516 case UnaryOperator::Imag: 4517 case UnaryOperator::Extension: 4518 return getPrimaryDecl(UO->getSubExpr()); 4519 default: 4520 return 0; 4521 } 4522 } 4523 case Stmt::ParenExprClass: 4524 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4525 case Stmt::ImplicitCastExprClass: 4526 // If the result of an implicit cast is an l-value, we care about 4527 // the sub-expression; otherwise, the result here doesn't matter. 4528 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4529 default: 4530 return 0; 4531 } 4532} 4533 4534/// CheckAddressOfOperand - The operand of & must be either a function 4535/// designator or an lvalue designating an object. If it is an lvalue, the 4536/// object cannot be declared with storage class register or be a bit field. 4537/// Note: The usual conversions are *not* applied to the operand of the & 4538/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4539/// In C++, the operand might be an overloaded function name, in which case 4540/// we allow the '&' but retain the overloaded-function type. 4541QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4542 // Make sure to ignore parentheses in subsequent checks 4543 op = op->IgnoreParens(); 4544 4545 if (op->isTypeDependent()) 4546 return Context.DependentTy; 4547 4548 if (getLangOptions().C99) { 4549 // Implement C99-only parts of addressof rules. 4550 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4551 if (uOp->getOpcode() == UnaryOperator::Deref) 4552 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4553 // (assuming the deref expression is valid). 4554 return uOp->getSubExpr()->getType(); 4555 } 4556 // Technically, there should be a check for array subscript 4557 // expressions here, but the result of one is always an lvalue anyway. 4558 } 4559 NamedDecl *dcl = getPrimaryDecl(op); 4560 Expr::isLvalueResult lval = op->isLvalue(Context); 4561 4562 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4563 // C99 6.5.3.2p1 4564 // The operand must be either an l-value or a function designator 4565 if (!op->getType()->isFunctionType()) { 4566 // FIXME: emit more specific diag... 4567 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4568 << op->getSourceRange(); 4569 return QualType(); 4570 } 4571 } else if (op->getBitField()) { // C99 6.5.3.2p1 4572 // The operand cannot be a bit-field 4573 Diag(OpLoc, diag::err_typecheck_address_of) 4574 << "bit-field" << op->getSourceRange(); 4575 return QualType(); 4576 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4577 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4578 // The operand cannot be an element of a vector 4579 Diag(OpLoc, diag::err_typecheck_address_of) 4580 << "vector element" << op->getSourceRange(); 4581 return QualType(); 4582 } else if (dcl) { // C99 6.5.3.2p1 4583 // We have an lvalue with a decl. Make sure the decl is not declared 4584 // with the register storage-class specifier. 4585 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4586 if (vd->getStorageClass() == VarDecl::Register) { 4587 Diag(OpLoc, diag::err_typecheck_address_of) 4588 << "register variable" << op->getSourceRange(); 4589 return QualType(); 4590 } 4591 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4592 return Context.OverloadTy; 4593 } else if (isa<FieldDecl>(dcl)) { 4594 // Okay: we can take the address of a field. 4595 // Could be a pointer to member, though, if there is an explicit 4596 // scope qualifier for the class. 4597 if (isa<QualifiedDeclRefExpr>(op)) { 4598 DeclContext *Ctx = dcl->getDeclContext(); 4599 if (Ctx && Ctx->isRecord()) 4600 return Context.getMemberPointerType(op->getType(), 4601 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4602 } 4603 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4604 // Okay: we can take the address of a function. 4605 // As above. 4606 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4607 return Context.getMemberPointerType(op->getType(), 4608 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4609 } else if (!isa<FunctionDecl>(dcl)) 4610 assert(0 && "Unknown/unexpected decl type"); 4611 } 4612 4613 if (lval == Expr::LV_IncompleteVoidType) { 4614 // Taking the address of a void variable is technically illegal, but we 4615 // allow it in cases which are otherwise valid. 4616 // Example: "extern void x; void* y = &x;". 4617 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4618 } 4619 4620 // If the operand has type "type", the result has type "pointer to type". 4621 return Context.getPointerType(op->getType()); 4622} 4623 4624QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4625 if (Op->isTypeDependent()) 4626 return Context.DependentTy; 4627 4628 UsualUnaryConversions(Op); 4629 QualType Ty = Op->getType(); 4630 4631 // Note that per both C89 and C99, this is always legal, even if ptype is an 4632 // incomplete type or void. It would be possible to warn about dereferencing 4633 // a void pointer, but it's completely well-defined, and such a warning is 4634 // unlikely to catch any mistakes. 4635 if (const PointerType *PT = Ty->getAsPointerType()) 4636 return PT->getPointeeType(); 4637 4638 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4639 << Ty << Op->getSourceRange(); 4640 return QualType(); 4641} 4642 4643static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4644 tok::TokenKind Kind) { 4645 BinaryOperator::Opcode Opc; 4646 switch (Kind) { 4647 default: assert(0 && "Unknown binop!"); 4648 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4649 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4650 case tok::star: Opc = BinaryOperator::Mul; break; 4651 case tok::slash: Opc = BinaryOperator::Div; break; 4652 case tok::percent: Opc = BinaryOperator::Rem; break; 4653 case tok::plus: Opc = BinaryOperator::Add; break; 4654 case tok::minus: Opc = BinaryOperator::Sub; break; 4655 case tok::lessless: Opc = BinaryOperator::Shl; break; 4656 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4657 case tok::lessequal: Opc = BinaryOperator::LE; break; 4658 case tok::less: Opc = BinaryOperator::LT; break; 4659 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4660 case tok::greater: Opc = BinaryOperator::GT; break; 4661 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4662 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4663 case tok::amp: Opc = BinaryOperator::And; break; 4664 case tok::caret: Opc = BinaryOperator::Xor; break; 4665 case tok::pipe: Opc = BinaryOperator::Or; break; 4666 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4667 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4668 case tok::equal: Opc = BinaryOperator::Assign; break; 4669 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4670 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4671 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4672 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4673 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4674 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4675 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4676 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4677 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4678 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4679 case tok::comma: Opc = BinaryOperator::Comma; break; 4680 } 4681 return Opc; 4682} 4683 4684static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4685 tok::TokenKind Kind) { 4686 UnaryOperator::Opcode Opc; 4687 switch (Kind) { 4688 default: assert(0 && "Unknown unary op!"); 4689 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4690 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4691 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4692 case tok::star: Opc = UnaryOperator::Deref; break; 4693 case tok::plus: Opc = UnaryOperator::Plus; break; 4694 case tok::minus: Opc = UnaryOperator::Minus; break; 4695 case tok::tilde: Opc = UnaryOperator::Not; break; 4696 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4697 case tok::kw___real: Opc = UnaryOperator::Real; break; 4698 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4699 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4700 } 4701 return Opc; 4702} 4703 4704/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4705/// operator @p Opc at location @c TokLoc. This routine only supports 4706/// built-in operations; ActOnBinOp handles overloaded operators. 4707Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4708 unsigned Op, 4709 Expr *lhs, Expr *rhs) { 4710 QualType ResultTy; // Result type of the binary operator. 4711 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4712 // The following two variables are used for compound assignment operators 4713 QualType CompLHSTy; // Type of LHS after promotions for computation 4714 QualType CompResultTy; // Type of computation result 4715 4716 switch (Opc) { 4717 case BinaryOperator::Assign: 4718 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4719 break; 4720 case BinaryOperator::PtrMemD: 4721 case BinaryOperator::PtrMemI: 4722 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4723 Opc == BinaryOperator::PtrMemI); 4724 break; 4725 case BinaryOperator::Mul: 4726 case BinaryOperator::Div: 4727 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4728 break; 4729 case BinaryOperator::Rem: 4730 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4731 break; 4732 case BinaryOperator::Add: 4733 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4734 break; 4735 case BinaryOperator::Sub: 4736 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4737 break; 4738 case BinaryOperator::Shl: 4739 case BinaryOperator::Shr: 4740 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4741 break; 4742 case BinaryOperator::LE: 4743 case BinaryOperator::LT: 4744 case BinaryOperator::GE: 4745 case BinaryOperator::GT: 4746 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4747 break; 4748 case BinaryOperator::EQ: 4749 case BinaryOperator::NE: 4750 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4751 break; 4752 case BinaryOperator::And: 4753 case BinaryOperator::Xor: 4754 case BinaryOperator::Or: 4755 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4756 break; 4757 case BinaryOperator::LAnd: 4758 case BinaryOperator::LOr: 4759 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4760 break; 4761 case BinaryOperator::MulAssign: 4762 case BinaryOperator::DivAssign: 4763 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4764 CompLHSTy = CompResultTy; 4765 if (!CompResultTy.isNull()) 4766 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4767 break; 4768 case BinaryOperator::RemAssign: 4769 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4770 CompLHSTy = CompResultTy; 4771 if (!CompResultTy.isNull()) 4772 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4773 break; 4774 case BinaryOperator::AddAssign: 4775 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4776 if (!CompResultTy.isNull()) 4777 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4778 break; 4779 case BinaryOperator::SubAssign: 4780 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4781 if (!CompResultTy.isNull()) 4782 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4783 break; 4784 case BinaryOperator::ShlAssign: 4785 case BinaryOperator::ShrAssign: 4786 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4787 CompLHSTy = CompResultTy; 4788 if (!CompResultTy.isNull()) 4789 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4790 break; 4791 case BinaryOperator::AndAssign: 4792 case BinaryOperator::XorAssign: 4793 case BinaryOperator::OrAssign: 4794 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4795 CompLHSTy = CompResultTy; 4796 if (!CompResultTy.isNull()) 4797 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4798 break; 4799 case BinaryOperator::Comma: 4800 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4801 break; 4802 } 4803 if (ResultTy.isNull()) 4804 return ExprError(); 4805 if (CompResultTy.isNull()) 4806 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4807 else 4808 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4809 CompLHSTy, CompResultTy, 4810 OpLoc)); 4811} 4812 4813// Binary Operators. 'Tok' is the token for the operator. 4814Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4815 tok::TokenKind Kind, 4816 ExprArg LHS, ExprArg RHS) { 4817 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4818 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4819 4820 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4821 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4822 4823 if (getLangOptions().CPlusPlus && 4824 (lhs->getType()->isOverloadableType() || 4825 rhs->getType()->isOverloadableType())) { 4826 // Find all of the overloaded operators visible from this 4827 // point. We perform both an operator-name lookup from the local 4828 // scope and an argument-dependent lookup based on the types of 4829 // the arguments. 4830 FunctionSet Functions; 4831 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4832 if (OverOp != OO_None) { 4833 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4834 Functions); 4835 Expr *Args[2] = { lhs, rhs }; 4836 DeclarationName OpName 4837 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4838 ArgumentDependentLookup(OpName, Args, 2, Functions); 4839 } 4840 4841 // Build the (potentially-overloaded, potentially-dependent) 4842 // binary operation. 4843 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4844 } 4845 4846 // Build a built-in binary operation. 4847 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4848} 4849 4850Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4851 unsigned OpcIn, 4852 ExprArg InputArg) { 4853 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4854 4855 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4856 Expr *Input = (Expr *)InputArg.get(); 4857 QualType resultType; 4858 switch (Opc) { 4859 case UnaryOperator::PostInc: 4860 case UnaryOperator::PostDec: 4861 case UnaryOperator::OffsetOf: 4862 assert(false && "Invalid unary operator"); 4863 break; 4864 4865 case UnaryOperator::PreInc: 4866 case UnaryOperator::PreDec: 4867 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4868 Opc == UnaryOperator::PreInc); 4869 break; 4870 case UnaryOperator::AddrOf: 4871 resultType = CheckAddressOfOperand(Input, OpLoc); 4872 break; 4873 case UnaryOperator::Deref: 4874 DefaultFunctionArrayConversion(Input); 4875 resultType = CheckIndirectionOperand(Input, OpLoc); 4876 break; 4877 case UnaryOperator::Plus: 4878 case UnaryOperator::Minus: 4879 UsualUnaryConversions(Input); 4880 resultType = Input->getType(); 4881 if (resultType->isDependentType()) 4882 break; 4883 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4884 break; 4885 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4886 resultType->isEnumeralType()) 4887 break; 4888 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4889 Opc == UnaryOperator::Plus && 4890 resultType->isPointerType()) 4891 break; 4892 4893 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4894 << resultType << Input->getSourceRange()); 4895 case UnaryOperator::Not: // bitwise complement 4896 UsualUnaryConversions(Input); 4897 resultType = Input->getType(); 4898 if (resultType->isDependentType()) 4899 break; 4900 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4901 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4902 // C99 does not support '~' for complex conjugation. 4903 Diag(OpLoc, diag::ext_integer_complement_complex) 4904 << resultType << Input->getSourceRange(); 4905 else if (!resultType->isIntegerType()) 4906 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4907 << resultType << Input->getSourceRange()); 4908 break; 4909 case UnaryOperator::LNot: // logical negation 4910 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4911 DefaultFunctionArrayConversion(Input); 4912 resultType = Input->getType(); 4913 if (resultType->isDependentType()) 4914 break; 4915 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4916 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4917 << resultType << Input->getSourceRange()); 4918 // LNot always has type int. C99 6.5.3.3p5. 4919 // In C++, it's bool. C++ 5.3.1p8 4920 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4921 break; 4922 case UnaryOperator::Real: 4923 case UnaryOperator::Imag: 4924 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4925 break; 4926 case UnaryOperator::Extension: 4927 resultType = Input->getType(); 4928 break; 4929 } 4930 if (resultType.isNull()) 4931 return ExprError(); 4932 4933 InputArg.release(); 4934 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4935} 4936 4937// Unary Operators. 'Tok' is the token for the operator. 4938Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4939 tok::TokenKind Op, ExprArg input) { 4940 Expr *Input = (Expr*)input.get(); 4941 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4942 4943 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4944 // Find all of the overloaded operators visible from this 4945 // point. We perform both an operator-name lookup from the local 4946 // scope and an argument-dependent lookup based on the types of 4947 // the arguments. 4948 FunctionSet Functions; 4949 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4950 if (OverOp != OO_None) { 4951 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4952 Functions); 4953 DeclarationName OpName 4954 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4955 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4956 } 4957 4958 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4959 } 4960 4961 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4962} 4963 4964/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4965Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4966 SourceLocation LabLoc, 4967 IdentifierInfo *LabelII) { 4968 // Look up the record for this label identifier. 4969 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4970 4971 // If we haven't seen this label yet, create a forward reference. It 4972 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4973 if (LabelDecl == 0) 4974 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4975 4976 // Create the AST node. The address of a label always has type 'void*'. 4977 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4978 Context.getPointerType(Context.VoidTy))); 4979} 4980 4981Sema::OwningExprResult 4982Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4983 SourceLocation RPLoc) { // "({..})" 4984 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4985 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4986 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4987 4988 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4989 if (isFileScope) 4990 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4991 4992 // FIXME: there are a variety of strange constraints to enforce here, for 4993 // example, it is not possible to goto into a stmt expression apparently. 4994 // More semantic analysis is needed. 4995 4996 // If there are sub stmts in the compound stmt, take the type of the last one 4997 // as the type of the stmtexpr. 4998 QualType Ty = Context.VoidTy; 4999 5000 if (!Compound->body_empty()) { 5001 Stmt *LastStmt = Compound->body_back(); 5002 // If LastStmt is a label, skip down through into the body. 5003 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5004 LastStmt = Label->getSubStmt(); 5005 5006 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5007 Ty = LastExpr->getType(); 5008 } 5009 5010 // FIXME: Check that expression type is complete/non-abstract; statement 5011 // expressions are not lvalues. 5012 5013 substmt.release(); 5014 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5015} 5016 5017Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5018 SourceLocation BuiltinLoc, 5019 SourceLocation TypeLoc, 5020 TypeTy *argty, 5021 OffsetOfComponent *CompPtr, 5022 unsigned NumComponents, 5023 SourceLocation RPLoc) { 5024 // FIXME: This function leaks all expressions in the offset components on 5025 // error. 5026 QualType ArgTy = QualType::getFromOpaquePtr(argty); 5027 assert(!ArgTy.isNull() && "Missing type argument!"); 5028 5029 bool Dependent = ArgTy->isDependentType(); 5030 5031 // We must have at least one component that refers to the type, and the first 5032 // one is known to be a field designator. Verify that the ArgTy represents 5033 // a struct/union/class. 5034 if (!Dependent && !ArgTy->isRecordType()) 5035 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5036 5037 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5038 // with an incomplete type would be illegal. 5039 5040 // Otherwise, create a null pointer as the base, and iteratively process 5041 // the offsetof designators. 5042 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5043 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5044 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5045 ArgTy, SourceLocation()); 5046 5047 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5048 // GCC extension, diagnose them. 5049 // FIXME: This diagnostic isn't actually visible because the location is in 5050 // a system header! 5051 if (NumComponents != 1) 5052 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5053 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5054 5055 if (!Dependent) { 5056 bool DidWarnAboutNonPOD = false; 5057 5058 // FIXME: Dependent case loses a lot of information here. And probably 5059 // leaks like a sieve. 5060 for (unsigned i = 0; i != NumComponents; ++i) { 5061 const OffsetOfComponent &OC = CompPtr[i]; 5062 if (OC.isBrackets) { 5063 // Offset of an array sub-field. TODO: Should we allow vector elements? 5064 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5065 if (!AT) { 5066 Res->Destroy(Context); 5067 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5068 << Res->getType()); 5069 } 5070 5071 // FIXME: C++: Verify that operator[] isn't overloaded. 5072 5073 // Promote the array so it looks more like a normal array subscript 5074 // expression. 5075 DefaultFunctionArrayConversion(Res); 5076 5077 // C99 6.5.2.1p1 5078 Expr *Idx = static_cast<Expr*>(OC.U.E); 5079 // FIXME: Leaks Res 5080 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5081 return ExprError(Diag(Idx->getLocStart(), 5082 diag::err_typecheck_subscript_not_integer) 5083 << Idx->getSourceRange()); 5084 5085 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5086 OC.LocEnd); 5087 continue; 5088 } 5089 5090 const RecordType *RC = Res->getType()->getAsRecordType(); 5091 if (!RC) { 5092 Res->Destroy(Context); 5093 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5094 << Res->getType()); 5095 } 5096 5097 // Get the decl corresponding to this. 5098 RecordDecl *RD = RC->getDecl(); 5099 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5100 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5101 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5102 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5103 << Res->getType()); 5104 DidWarnAboutNonPOD = true; 5105 } 5106 } 5107 5108 FieldDecl *MemberDecl 5109 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5110 LookupMemberName) 5111 .getAsDecl()); 5112 // FIXME: Leaks Res 5113 if (!MemberDecl) 5114 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5115 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5116 5117 // FIXME: C++: Verify that MemberDecl isn't a static field. 5118 // FIXME: Verify that MemberDecl isn't a bitfield. 5119 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5120 Res = BuildAnonymousStructUnionMemberReference( 5121 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5122 } else { 5123 // MemberDecl->getType() doesn't get the right qualifiers, but it 5124 // doesn't matter here. 5125 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5126 MemberDecl->getType().getNonReferenceType()); 5127 } 5128 } 5129 } 5130 5131 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5132 Context.getSizeType(), BuiltinLoc)); 5133} 5134 5135 5136Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5137 TypeTy *arg1,TypeTy *arg2, 5138 SourceLocation RPLoc) { 5139 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5140 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5141 5142 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5143 5144 if (getLangOptions().CPlusPlus) { 5145 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5146 << SourceRange(BuiltinLoc, RPLoc); 5147 return ExprError(); 5148 } 5149 5150 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5151 argT1, argT2, RPLoc)); 5152} 5153 5154Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5155 ExprArg cond, 5156 ExprArg expr1, ExprArg expr2, 5157 SourceLocation RPLoc) { 5158 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5159 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5160 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5161 5162 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5163 5164 QualType resType; 5165 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5166 resType = Context.DependentTy; 5167 } else { 5168 // The conditional expression is required to be a constant expression. 5169 llvm::APSInt condEval(32); 5170 SourceLocation ExpLoc; 5171 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5172 return ExprError(Diag(ExpLoc, 5173 diag::err_typecheck_choose_expr_requires_constant) 5174 << CondExpr->getSourceRange()); 5175 5176 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5177 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5178 } 5179 5180 cond.release(); expr1.release(); expr2.release(); 5181 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5182 resType, RPLoc)); 5183} 5184 5185//===----------------------------------------------------------------------===// 5186// Clang Extensions. 5187//===----------------------------------------------------------------------===// 5188 5189/// ActOnBlockStart - This callback is invoked when a block literal is started. 5190void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5191 // Analyze block parameters. 5192 BlockSemaInfo *BSI = new BlockSemaInfo(); 5193 5194 // Add BSI to CurBlock. 5195 BSI->PrevBlockInfo = CurBlock; 5196 CurBlock = BSI; 5197 5198 BSI->ReturnType = QualType(); 5199 BSI->TheScope = BlockScope; 5200 BSI->hasBlockDeclRefExprs = false; 5201 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5202 CurFunctionNeedsScopeChecking = false; 5203 5204 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5205 PushDeclContext(BlockScope, BSI->TheDecl); 5206} 5207 5208void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5209 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5210 5211 if (ParamInfo.getNumTypeObjects() == 0 5212 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5213 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5214 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5215 5216 if (T->isArrayType()) { 5217 Diag(ParamInfo.getSourceRange().getBegin(), 5218 diag::err_block_returns_array); 5219 return; 5220 } 5221 5222 // The parameter list is optional, if there was none, assume (). 5223 if (!T->isFunctionType()) 5224 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5225 5226 CurBlock->hasPrototype = true; 5227 CurBlock->isVariadic = false; 5228 // Check for a valid sentinel attribute on this block.
| 4251 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4252 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4253 ImpCastExprToType(lex, rType); // promote the integer to pointer 4254 return ResultTy; 4255 } 4256 // Handle block pointers. 4257 if (!isRelational && RHSIsNull 4258 && lType->isBlockPointerType() && rType->isIntegerType()) { 4259 ImpCastExprToType(rex, lType); // promote the integer to pointer 4260 return ResultTy; 4261 } 4262 if (!isRelational && LHSIsNull 4263 && lType->isIntegerType() && rType->isBlockPointerType()) { 4264 ImpCastExprToType(lex, rType); // promote the integer to pointer 4265 return ResultTy; 4266 } 4267 return InvalidOperands(Loc, lex, rex); 4268} 4269 4270/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4271/// operates on extended vector types. Instead of producing an IntTy result, 4272/// like a scalar comparison, a vector comparison produces a vector of integer 4273/// types. 4274QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4275 SourceLocation Loc, 4276 bool isRelational) { 4277 // Check to make sure we're operating on vectors of the same type and width, 4278 // Allowing one side to be a scalar of element type. 4279 QualType vType = CheckVectorOperands(Loc, lex, rex); 4280 if (vType.isNull()) 4281 return vType; 4282 4283 QualType lType = lex->getType(); 4284 QualType rType = rex->getType(); 4285 4286 // For non-floating point types, check for self-comparisons of the form 4287 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4288 // often indicate logic errors in the program. 4289 if (!lType->isFloatingType()) { 4290 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4291 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4292 if (DRL->getDecl() == DRR->getDecl()) 4293 Diag(Loc, diag::warn_selfcomparison); 4294 } 4295 4296 // Check for comparisons of floating point operands using != and ==. 4297 if (!isRelational && lType->isFloatingType()) { 4298 assert (rType->isFloatingType()); 4299 CheckFloatComparison(Loc,lex,rex); 4300 } 4301 4302 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4303 // just reject all vector comparisons for now. 4304 if (1) { 4305 Diag(Loc, diag::err_typecheck_vector_comparison) 4306 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4307 return QualType(); 4308 } 4309 4310 // Return the type for the comparison, which is the same as vector type for 4311 // integer vectors, or an integer type of identical size and number of 4312 // elements for floating point vectors. 4313 if (lType->isIntegerType()) 4314 return lType; 4315 4316 const VectorType *VTy = lType->getAsVectorType(); 4317 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4318 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4319 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4320 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4321 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4322 4323 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4324 "Unhandled vector element size in vector compare"); 4325 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4326} 4327 4328inline QualType Sema::CheckBitwiseOperands( 4329 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4330{ 4331 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4332 return CheckVectorOperands(Loc, lex, rex); 4333 4334 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4335 4336 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4337 return compType; 4338 return InvalidOperands(Loc, lex, rex); 4339} 4340 4341inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4342 Expr *&lex, Expr *&rex, SourceLocation Loc) 4343{ 4344 UsualUnaryConversions(lex); 4345 UsualUnaryConversions(rex); 4346 4347 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4348 return Context.IntTy; 4349 return InvalidOperands(Loc, lex, rex); 4350} 4351 4352/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4353/// is a read-only property; return true if so. A readonly property expression 4354/// depends on various declarations and thus must be treated specially. 4355/// 4356static bool IsReadonlyProperty(Expr *E, Sema &S) 4357{ 4358 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4359 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4360 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4361 QualType BaseType = PropExpr->getBase()->getType(); 4362 if (const PointerType *PTy = BaseType->getAsPointerType()) 4363 if (const ObjCInterfaceType *IFTy = 4364 PTy->getPointeeType()->getAsObjCInterfaceType()) 4365 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4366 if (S.isPropertyReadonly(PDecl, IFace)) 4367 return true; 4368 } 4369 } 4370 return false; 4371} 4372 4373/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4374/// emit an error and return true. If so, return false. 4375static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4376 SourceLocation OrigLoc = Loc; 4377 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4378 &Loc); 4379 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4380 IsLV = Expr::MLV_ReadonlyProperty; 4381 if (IsLV == Expr::MLV_Valid) 4382 return false; 4383 4384 unsigned Diag = 0; 4385 bool NeedType = false; 4386 switch (IsLV) { // C99 6.5.16p2 4387 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4388 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4389 case Expr::MLV_ArrayType: 4390 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4391 NeedType = true; 4392 break; 4393 case Expr::MLV_NotObjectType: 4394 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4395 NeedType = true; 4396 break; 4397 case Expr::MLV_LValueCast: 4398 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4399 break; 4400 case Expr::MLV_InvalidExpression: 4401 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4402 break; 4403 case Expr::MLV_IncompleteType: 4404 case Expr::MLV_IncompleteVoidType: 4405 return S.RequireCompleteType(Loc, E->getType(), 4406 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4407 E->getSourceRange()); 4408 case Expr::MLV_DuplicateVectorComponents: 4409 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4410 break; 4411 case Expr::MLV_NotBlockQualified: 4412 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4413 break; 4414 case Expr::MLV_ReadonlyProperty: 4415 Diag = diag::error_readonly_property_assignment; 4416 break; 4417 case Expr::MLV_NoSetterProperty: 4418 Diag = diag::error_nosetter_property_assignment; 4419 break; 4420 } 4421 4422 SourceRange Assign; 4423 if (Loc != OrigLoc) 4424 Assign = SourceRange(OrigLoc, OrigLoc); 4425 if (NeedType) 4426 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4427 else 4428 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4429 return true; 4430} 4431 4432 4433 4434// C99 6.5.16.1 4435QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4436 SourceLocation Loc, 4437 QualType CompoundType) { 4438 // Verify that LHS is a modifiable lvalue, and emit error if not. 4439 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4440 return QualType(); 4441 4442 QualType LHSType = LHS->getType(); 4443 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4444 4445 AssignConvertType ConvTy; 4446 if (CompoundType.isNull()) { 4447 // Simple assignment "x = y". 4448 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4449 // Special case of NSObject attributes on c-style pointer types. 4450 if (ConvTy == IncompatiblePointer && 4451 ((Context.isObjCNSObjectType(LHSType) && 4452 Context.isObjCObjectPointerType(RHSType)) || 4453 (Context.isObjCNSObjectType(RHSType) && 4454 Context.isObjCObjectPointerType(LHSType)))) 4455 ConvTy = Compatible; 4456 4457 // If the RHS is a unary plus or minus, check to see if they = and + are 4458 // right next to each other. If so, the user may have typo'd "x =+ 4" 4459 // instead of "x += 4". 4460 Expr *RHSCheck = RHS; 4461 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4462 RHSCheck = ICE->getSubExpr(); 4463 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4464 if ((UO->getOpcode() == UnaryOperator::Plus || 4465 UO->getOpcode() == UnaryOperator::Minus) && 4466 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4467 // Only if the two operators are exactly adjacent. 4468 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4469 // And there is a space or other character before the subexpr of the 4470 // unary +/-. We don't want to warn on "x=-1". 4471 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4472 UO->getSubExpr()->getLocStart().isFileID()) { 4473 Diag(Loc, diag::warn_not_compound_assign) 4474 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4475 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4476 } 4477 } 4478 } else { 4479 // Compound assignment "x += y" 4480 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4481 } 4482 4483 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4484 RHS, "assigning")) 4485 return QualType(); 4486 4487 // C99 6.5.16p3: The type of an assignment expression is the type of the 4488 // left operand unless the left operand has qualified type, in which case 4489 // it is the unqualified version of the type of the left operand. 4490 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4491 // is converted to the type of the assignment expression (above). 4492 // C++ 5.17p1: the type of the assignment expression is that of its left 4493 // operand. 4494 return LHSType.getUnqualifiedType(); 4495} 4496 4497// C99 6.5.17 4498QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4499 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4500 DefaultFunctionArrayConversion(RHS); 4501 4502 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4503 // incomplete in C++). 4504 4505 return RHS->getType(); 4506} 4507 4508/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4509/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4510QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4511 bool isInc) { 4512 if (Op->isTypeDependent()) 4513 return Context.DependentTy; 4514 4515 QualType ResType = Op->getType(); 4516 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4517 4518 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4519 // Decrement of bool is not allowed. 4520 if (!isInc) { 4521 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4522 return QualType(); 4523 } 4524 // Increment of bool sets it to true, but is deprecated. 4525 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4526 } else if (ResType->isRealType()) { 4527 // OK! 4528 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4529 // C99 6.5.2.4p2, 6.5.6p2 4530 if (PT->getPointeeType()->isVoidType()) { 4531 if (getLangOptions().CPlusPlus) { 4532 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4533 << Op->getSourceRange(); 4534 return QualType(); 4535 } 4536 4537 // Pointer to void is a GNU extension in C. 4538 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4539 } else if (PT->getPointeeType()->isFunctionType()) { 4540 if (getLangOptions().CPlusPlus) { 4541 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4542 << Op->getType() << Op->getSourceRange(); 4543 return QualType(); 4544 } 4545 4546 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4547 << ResType << Op->getSourceRange(); 4548 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4549 diag::err_typecheck_arithmetic_incomplete_type, 4550 Op->getSourceRange(), SourceRange(), 4551 ResType)) 4552 return QualType(); 4553 } else if (ResType->isComplexType()) { 4554 // C99 does not support ++/-- on complex types, we allow as an extension. 4555 Diag(OpLoc, diag::ext_integer_increment_complex) 4556 << ResType << Op->getSourceRange(); 4557 } else { 4558 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4559 << ResType << Op->getSourceRange(); 4560 return QualType(); 4561 } 4562 // At this point, we know we have a real, complex or pointer type. 4563 // Now make sure the operand is a modifiable lvalue. 4564 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4565 return QualType(); 4566 return ResType; 4567} 4568 4569/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4570/// This routine allows us to typecheck complex/recursive expressions 4571/// where the declaration is needed for type checking. We only need to 4572/// handle cases when the expression references a function designator 4573/// or is an lvalue. Here are some examples: 4574/// - &(x) => x 4575/// - &*****f => f for f a function designator. 4576/// - &s.xx => s 4577/// - &s.zz[1].yy -> s, if zz is an array 4578/// - *(x + 1) -> x, if x is an array 4579/// - &"123"[2] -> 0 4580/// - & __real__ x -> x 4581static NamedDecl *getPrimaryDecl(Expr *E) { 4582 switch (E->getStmtClass()) { 4583 case Stmt::DeclRefExprClass: 4584 case Stmt::QualifiedDeclRefExprClass: 4585 return cast<DeclRefExpr>(E)->getDecl(); 4586 case Stmt::MemberExprClass: 4587 // If this is an arrow operator, the address is an offset from 4588 // the base's value, so the object the base refers to is 4589 // irrelevant. 4590 if (cast<MemberExpr>(E)->isArrow()) 4591 return 0; 4592 // Otherwise, the expression refers to a part of the base 4593 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4594 case Stmt::ArraySubscriptExprClass: { 4595 // FIXME: This code shouldn't be necessary! We should catch the implicit 4596 // promotion of register arrays earlier. 4597 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4598 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4599 if (ICE->getSubExpr()->getType()->isArrayType()) 4600 return getPrimaryDecl(ICE->getSubExpr()); 4601 } 4602 return 0; 4603 } 4604 case Stmt::UnaryOperatorClass: { 4605 UnaryOperator *UO = cast<UnaryOperator>(E); 4606 4607 switch(UO->getOpcode()) { 4608 case UnaryOperator::Real: 4609 case UnaryOperator::Imag: 4610 case UnaryOperator::Extension: 4611 return getPrimaryDecl(UO->getSubExpr()); 4612 default: 4613 return 0; 4614 } 4615 } 4616 case Stmt::ParenExprClass: 4617 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4618 case Stmt::ImplicitCastExprClass: 4619 // If the result of an implicit cast is an l-value, we care about 4620 // the sub-expression; otherwise, the result here doesn't matter. 4621 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4622 default: 4623 return 0; 4624 } 4625} 4626 4627/// CheckAddressOfOperand - The operand of & must be either a function 4628/// designator or an lvalue designating an object. If it is an lvalue, the 4629/// object cannot be declared with storage class register or be a bit field. 4630/// Note: The usual conversions are *not* applied to the operand of the & 4631/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4632/// In C++, the operand might be an overloaded function name, in which case 4633/// we allow the '&' but retain the overloaded-function type. 4634QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4635 // Make sure to ignore parentheses in subsequent checks 4636 op = op->IgnoreParens(); 4637 4638 if (op->isTypeDependent()) 4639 return Context.DependentTy; 4640 4641 if (getLangOptions().C99) { 4642 // Implement C99-only parts of addressof rules. 4643 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4644 if (uOp->getOpcode() == UnaryOperator::Deref) 4645 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4646 // (assuming the deref expression is valid). 4647 return uOp->getSubExpr()->getType(); 4648 } 4649 // Technically, there should be a check for array subscript 4650 // expressions here, but the result of one is always an lvalue anyway. 4651 } 4652 NamedDecl *dcl = getPrimaryDecl(op); 4653 Expr::isLvalueResult lval = op->isLvalue(Context); 4654 4655 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4656 // C99 6.5.3.2p1 4657 // The operand must be either an l-value or a function designator 4658 if (!op->getType()->isFunctionType()) { 4659 // FIXME: emit more specific diag... 4660 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4661 << op->getSourceRange(); 4662 return QualType(); 4663 } 4664 } else if (op->getBitField()) { // C99 6.5.3.2p1 4665 // The operand cannot be a bit-field 4666 Diag(OpLoc, diag::err_typecheck_address_of) 4667 << "bit-field" << op->getSourceRange(); 4668 return QualType(); 4669 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4670 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4671 // The operand cannot be an element of a vector 4672 Diag(OpLoc, diag::err_typecheck_address_of) 4673 << "vector element" << op->getSourceRange(); 4674 return QualType(); 4675 } else if (dcl) { // C99 6.5.3.2p1 4676 // We have an lvalue with a decl. Make sure the decl is not declared 4677 // with the register storage-class specifier. 4678 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4679 if (vd->getStorageClass() == VarDecl::Register) { 4680 Diag(OpLoc, diag::err_typecheck_address_of) 4681 << "register variable" << op->getSourceRange(); 4682 return QualType(); 4683 } 4684 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4685 return Context.OverloadTy; 4686 } else if (isa<FieldDecl>(dcl)) { 4687 // Okay: we can take the address of a field. 4688 // Could be a pointer to member, though, if there is an explicit 4689 // scope qualifier for the class. 4690 if (isa<QualifiedDeclRefExpr>(op)) { 4691 DeclContext *Ctx = dcl->getDeclContext(); 4692 if (Ctx && Ctx->isRecord()) 4693 return Context.getMemberPointerType(op->getType(), 4694 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4695 } 4696 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4697 // Okay: we can take the address of a function. 4698 // As above. 4699 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4700 return Context.getMemberPointerType(op->getType(), 4701 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4702 } else if (!isa<FunctionDecl>(dcl)) 4703 assert(0 && "Unknown/unexpected decl type"); 4704 } 4705 4706 if (lval == Expr::LV_IncompleteVoidType) { 4707 // Taking the address of a void variable is technically illegal, but we 4708 // allow it in cases which are otherwise valid. 4709 // Example: "extern void x; void* y = &x;". 4710 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4711 } 4712 4713 // If the operand has type "type", the result has type "pointer to type". 4714 return Context.getPointerType(op->getType()); 4715} 4716 4717QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4718 if (Op->isTypeDependent()) 4719 return Context.DependentTy; 4720 4721 UsualUnaryConversions(Op); 4722 QualType Ty = Op->getType(); 4723 4724 // Note that per both C89 and C99, this is always legal, even if ptype is an 4725 // incomplete type or void. It would be possible to warn about dereferencing 4726 // a void pointer, but it's completely well-defined, and such a warning is 4727 // unlikely to catch any mistakes. 4728 if (const PointerType *PT = Ty->getAsPointerType()) 4729 return PT->getPointeeType(); 4730 4731 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4732 << Ty << Op->getSourceRange(); 4733 return QualType(); 4734} 4735 4736static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4737 tok::TokenKind Kind) { 4738 BinaryOperator::Opcode Opc; 4739 switch (Kind) { 4740 default: assert(0 && "Unknown binop!"); 4741 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4742 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4743 case tok::star: Opc = BinaryOperator::Mul; break; 4744 case tok::slash: Opc = BinaryOperator::Div; break; 4745 case tok::percent: Opc = BinaryOperator::Rem; break; 4746 case tok::plus: Opc = BinaryOperator::Add; break; 4747 case tok::minus: Opc = BinaryOperator::Sub; break; 4748 case tok::lessless: Opc = BinaryOperator::Shl; break; 4749 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4750 case tok::lessequal: Opc = BinaryOperator::LE; break; 4751 case tok::less: Opc = BinaryOperator::LT; break; 4752 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4753 case tok::greater: Opc = BinaryOperator::GT; break; 4754 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4755 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4756 case tok::amp: Opc = BinaryOperator::And; break; 4757 case tok::caret: Opc = BinaryOperator::Xor; break; 4758 case tok::pipe: Opc = BinaryOperator::Or; break; 4759 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4760 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4761 case tok::equal: Opc = BinaryOperator::Assign; break; 4762 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4763 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4764 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4765 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4766 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4767 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4768 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4769 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4770 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4771 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4772 case tok::comma: Opc = BinaryOperator::Comma; break; 4773 } 4774 return Opc; 4775} 4776 4777static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4778 tok::TokenKind Kind) { 4779 UnaryOperator::Opcode Opc; 4780 switch (Kind) { 4781 default: assert(0 && "Unknown unary op!"); 4782 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4783 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4784 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4785 case tok::star: Opc = UnaryOperator::Deref; break; 4786 case tok::plus: Opc = UnaryOperator::Plus; break; 4787 case tok::minus: Opc = UnaryOperator::Minus; break; 4788 case tok::tilde: Opc = UnaryOperator::Not; break; 4789 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4790 case tok::kw___real: Opc = UnaryOperator::Real; break; 4791 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4792 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4793 } 4794 return Opc; 4795} 4796 4797/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4798/// operator @p Opc at location @c TokLoc. This routine only supports 4799/// built-in operations; ActOnBinOp handles overloaded operators. 4800Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4801 unsigned Op, 4802 Expr *lhs, Expr *rhs) { 4803 QualType ResultTy; // Result type of the binary operator. 4804 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4805 // The following two variables are used for compound assignment operators 4806 QualType CompLHSTy; // Type of LHS after promotions for computation 4807 QualType CompResultTy; // Type of computation result 4808 4809 switch (Opc) { 4810 case BinaryOperator::Assign: 4811 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4812 break; 4813 case BinaryOperator::PtrMemD: 4814 case BinaryOperator::PtrMemI: 4815 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4816 Opc == BinaryOperator::PtrMemI); 4817 break; 4818 case BinaryOperator::Mul: 4819 case BinaryOperator::Div: 4820 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4821 break; 4822 case BinaryOperator::Rem: 4823 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4824 break; 4825 case BinaryOperator::Add: 4826 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4827 break; 4828 case BinaryOperator::Sub: 4829 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4830 break; 4831 case BinaryOperator::Shl: 4832 case BinaryOperator::Shr: 4833 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4834 break; 4835 case BinaryOperator::LE: 4836 case BinaryOperator::LT: 4837 case BinaryOperator::GE: 4838 case BinaryOperator::GT: 4839 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4840 break; 4841 case BinaryOperator::EQ: 4842 case BinaryOperator::NE: 4843 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4844 break; 4845 case BinaryOperator::And: 4846 case BinaryOperator::Xor: 4847 case BinaryOperator::Or: 4848 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4849 break; 4850 case BinaryOperator::LAnd: 4851 case BinaryOperator::LOr: 4852 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4853 break; 4854 case BinaryOperator::MulAssign: 4855 case BinaryOperator::DivAssign: 4856 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4857 CompLHSTy = CompResultTy; 4858 if (!CompResultTy.isNull()) 4859 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4860 break; 4861 case BinaryOperator::RemAssign: 4862 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4863 CompLHSTy = CompResultTy; 4864 if (!CompResultTy.isNull()) 4865 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4866 break; 4867 case BinaryOperator::AddAssign: 4868 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4869 if (!CompResultTy.isNull()) 4870 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4871 break; 4872 case BinaryOperator::SubAssign: 4873 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4874 if (!CompResultTy.isNull()) 4875 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4876 break; 4877 case BinaryOperator::ShlAssign: 4878 case BinaryOperator::ShrAssign: 4879 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4880 CompLHSTy = CompResultTy; 4881 if (!CompResultTy.isNull()) 4882 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4883 break; 4884 case BinaryOperator::AndAssign: 4885 case BinaryOperator::XorAssign: 4886 case BinaryOperator::OrAssign: 4887 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4888 CompLHSTy = CompResultTy; 4889 if (!CompResultTy.isNull()) 4890 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4891 break; 4892 case BinaryOperator::Comma: 4893 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4894 break; 4895 } 4896 if (ResultTy.isNull()) 4897 return ExprError(); 4898 if (CompResultTy.isNull()) 4899 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4900 else 4901 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4902 CompLHSTy, CompResultTy, 4903 OpLoc)); 4904} 4905 4906// Binary Operators. 'Tok' is the token for the operator. 4907Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4908 tok::TokenKind Kind, 4909 ExprArg LHS, ExprArg RHS) { 4910 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4911 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4912 4913 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4914 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4915 4916 if (getLangOptions().CPlusPlus && 4917 (lhs->getType()->isOverloadableType() || 4918 rhs->getType()->isOverloadableType())) { 4919 // Find all of the overloaded operators visible from this 4920 // point. We perform both an operator-name lookup from the local 4921 // scope and an argument-dependent lookup based on the types of 4922 // the arguments. 4923 FunctionSet Functions; 4924 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4925 if (OverOp != OO_None) { 4926 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4927 Functions); 4928 Expr *Args[2] = { lhs, rhs }; 4929 DeclarationName OpName 4930 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4931 ArgumentDependentLookup(OpName, Args, 2, Functions); 4932 } 4933 4934 // Build the (potentially-overloaded, potentially-dependent) 4935 // binary operation. 4936 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4937 } 4938 4939 // Build a built-in binary operation. 4940 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4941} 4942 4943Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4944 unsigned OpcIn, 4945 ExprArg InputArg) { 4946 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4947 4948 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4949 Expr *Input = (Expr *)InputArg.get(); 4950 QualType resultType; 4951 switch (Opc) { 4952 case UnaryOperator::PostInc: 4953 case UnaryOperator::PostDec: 4954 case UnaryOperator::OffsetOf: 4955 assert(false && "Invalid unary operator"); 4956 break; 4957 4958 case UnaryOperator::PreInc: 4959 case UnaryOperator::PreDec: 4960 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4961 Opc == UnaryOperator::PreInc); 4962 break; 4963 case UnaryOperator::AddrOf: 4964 resultType = CheckAddressOfOperand(Input, OpLoc); 4965 break; 4966 case UnaryOperator::Deref: 4967 DefaultFunctionArrayConversion(Input); 4968 resultType = CheckIndirectionOperand(Input, OpLoc); 4969 break; 4970 case UnaryOperator::Plus: 4971 case UnaryOperator::Minus: 4972 UsualUnaryConversions(Input); 4973 resultType = Input->getType(); 4974 if (resultType->isDependentType()) 4975 break; 4976 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4977 break; 4978 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4979 resultType->isEnumeralType()) 4980 break; 4981 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4982 Opc == UnaryOperator::Plus && 4983 resultType->isPointerType()) 4984 break; 4985 4986 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4987 << resultType << Input->getSourceRange()); 4988 case UnaryOperator::Not: // bitwise complement 4989 UsualUnaryConversions(Input); 4990 resultType = Input->getType(); 4991 if (resultType->isDependentType()) 4992 break; 4993 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4994 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4995 // C99 does not support '~' for complex conjugation. 4996 Diag(OpLoc, diag::ext_integer_complement_complex) 4997 << resultType << Input->getSourceRange(); 4998 else if (!resultType->isIntegerType()) 4999 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5000 << resultType << Input->getSourceRange()); 5001 break; 5002 case UnaryOperator::LNot: // logical negation 5003 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5004 DefaultFunctionArrayConversion(Input); 5005 resultType = Input->getType(); 5006 if (resultType->isDependentType()) 5007 break; 5008 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5009 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5010 << resultType << Input->getSourceRange()); 5011 // LNot always has type int. C99 6.5.3.3p5. 5012 // In C++, it's bool. C++ 5.3.1p8 5013 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5014 break; 5015 case UnaryOperator::Real: 5016 case UnaryOperator::Imag: 5017 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5018 break; 5019 case UnaryOperator::Extension: 5020 resultType = Input->getType(); 5021 break; 5022 } 5023 if (resultType.isNull()) 5024 return ExprError(); 5025 5026 InputArg.release(); 5027 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5028} 5029 5030// Unary Operators. 'Tok' is the token for the operator. 5031Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5032 tok::TokenKind Op, ExprArg input) { 5033 Expr *Input = (Expr*)input.get(); 5034 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5035 5036 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5037 // Find all of the overloaded operators visible from this 5038 // point. We perform both an operator-name lookup from the local 5039 // scope and an argument-dependent lookup based on the types of 5040 // the arguments. 5041 FunctionSet Functions; 5042 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5043 if (OverOp != OO_None) { 5044 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5045 Functions); 5046 DeclarationName OpName 5047 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5048 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5049 } 5050 5051 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5052 } 5053 5054 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5055} 5056 5057/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5058Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5059 SourceLocation LabLoc, 5060 IdentifierInfo *LabelII) { 5061 // Look up the record for this label identifier. 5062 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5063 5064 // If we haven't seen this label yet, create a forward reference. It 5065 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5066 if (LabelDecl == 0) 5067 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5068 5069 // Create the AST node. The address of a label always has type 'void*'. 5070 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5071 Context.getPointerType(Context.VoidTy))); 5072} 5073 5074Sema::OwningExprResult 5075Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5076 SourceLocation RPLoc) { // "({..})" 5077 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5078 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5079 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5080 5081 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5082 if (isFileScope) 5083 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5084 5085 // FIXME: there are a variety of strange constraints to enforce here, for 5086 // example, it is not possible to goto into a stmt expression apparently. 5087 // More semantic analysis is needed. 5088 5089 // If there are sub stmts in the compound stmt, take the type of the last one 5090 // as the type of the stmtexpr. 5091 QualType Ty = Context.VoidTy; 5092 5093 if (!Compound->body_empty()) { 5094 Stmt *LastStmt = Compound->body_back(); 5095 // If LastStmt is a label, skip down through into the body. 5096 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5097 LastStmt = Label->getSubStmt(); 5098 5099 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5100 Ty = LastExpr->getType(); 5101 } 5102 5103 // FIXME: Check that expression type is complete/non-abstract; statement 5104 // expressions are not lvalues. 5105 5106 substmt.release(); 5107 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5108} 5109 5110Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5111 SourceLocation BuiltinLoc, 5112 SourceLocation TypeLoc, 5113 TypeTy *argty, 5114 OffsetOfComponent *CompPtr, 5115 unsigned NumComponents, 5116 SourceLocation RPLoc) { 5117 // FIXME: This function leaks all expressions in the offset components on 5118 // error. 5119 QualType ArgTy = QualType::getFromOpaquePtr(argty); 5120 assert(!ArgTy.isNull() && "Missing type argument!"); 5121 5122 bool Dependent = ArgTy->isDependentType(); 5123 5124 // We must have at least one component that refers to the type, and the first 5125 // one is known to be a field designator. Verify that the ArgTy represents 5126 // a struct/union/class. 5127 if (!Dependent && !ArgTy->isRecordType()) 5128 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5129 5130 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5131 // with an incomplete type would be illegal. 5132 5133 // Otherwise, create a null pointer as the base, and iteratively process 5134 // the offsetof designators. 5135 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5136 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5137 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5138 ArgTy, SourceLocation()); 5139 5140 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5141 // GCC extension, diagnose them. 5142 // FIXME: This diagnostic isn't actually visible because the location is in 5143 // a system header! 5144 if (NumComponents != 1) 5145 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5146 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5147 5148 if (!Dependent) { 5149 bool DidWarnAboutNonPOD = false; 5150 5151 // FIXME: Dependent case loses a lot of information here. And probably 5152 // leaks like a sieve. 5153 for (unsigned i = 0; i != NumComponents; ++i) { 5154 const OffsetOfComponent &OC = CompPtr[i]; 5155 if (OC.isBrackets) { 5156 // Offset of an array sub-field. TODO: Should we allow vector elements? 5157 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5158 if (!AT) { 5159 Res->Destroy(Context); 5160 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5161 << Res->getType()); 5162 } 5163 5164 // FIXME: C++: Verify that operator[] isn't overloaded. 5165 5166 // Promote the array so it looks more like a normal array subscript 5167 // expression. 5168 DefaultFunctionArrayConversion(Res); 5169 5170 // C99 6.5.2.1p1 5171 Expr *Idx = static_cast<Expr*>(OC.U.E); 5172 // FIXME: Leaks Res 5173 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5174 return ExprError(Diag(Idx->getLocStart(), 5175 diag::err_typecheck_subscript_not_integer) 5176 << Idx->getSourceRange()); 5177 5178 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5179 OC.LocEnd); 5180 continue; 5181 } 5182 5183 const RecordType *RC = Res->getType()->getAsRecordType(); 5184 if (!RC) { 5185 Res->Destroy(Context); 5186 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5187 << Res->getType()); 5188 } 5189 5190 // Get the decl corresponding to this. 5191 RecordDecl *RD = RC->getDecl(); 5192 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5193 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5194 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5195 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5196 << Res->getType()); 5197 DidWarnAboutNonPOD = true; 5198 } 5199 } 5200 5201 FieldDecl *MemberDecl 5202 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5203 LookupMemberName) 5204 .getAsDecl()); 5205 // FIXME: Leaks Res 5206 if (!MemberDecl) 5207 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5208 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5209 5210 // FIXME: C++: Verify that MemberDecl isn't a static field. 5211 // FIXME: Verify that MemberDecl isn't a bitfield. 5212 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5213 Res = BuildAnonymousStructUnionMemberReference( 5214 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5215 } else { 5216 // MemberDecl->getType() doesn't get the right qualifiers, but it 5217 // doesn't matter here. 5218 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5219 MemberDecl->getType().getNonReferenceType()); 5220 } 5221 } 5222 } 5223 5224 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5225 Context.getSizeType(), BuiltinLoc)); 5226} 5227 5228 5229Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5230 TypeTy *arg1,TypeTy *arg2, 5231 SourceLocation RPLoc) { 5232 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5233 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5234 5235 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5236 5237 if (getLangOptions().CPlusPlus) { 5238 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5239 << SourceRange(BuiltinLoc, RPLoc); 5240 return ExprError(); 5241 } 5242 5243 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5244 argT1, argT2, RPLoc)); 5245} 5246 5247Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5248 ExprArg cond, 5249 ExprArg expr1, ExprArg expr2, 5250 SourceLocation RPLoc) { 5251 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5252 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5253 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5254 5255 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5256 5257 QualType resType; 5258 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5259 resType = Context.DependentTy; 5260 } else { 5261 // The conditional expression is required to be a constant expression. 5262 llvm::APSInt condEval(32); 5263 SourceLocation ExpLoc; 5264 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5265 return ExprError(Diag(ExpLoc, 5266 diag::err_typecheck_choose_expr_requires_constant) 5267 << CondExpr->getSourceRange()); 5268 5269 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5270 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5271 } 5272 5273 cond.release(); expr1.release(); expr2.release(); 5274 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5275 resType, RPLoc)); 5276} 5277 5278//===----------------------------------------------------------------------===// 5279// Clang Extensions. 5280//===----------------------------------------------------------------------===// 5281 5282/// ActOnBlockStart - This callback is invoked when a block literal is started. 5283void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5284 // Analyze block parameters. 5285 BlockSemaInfo *BSI = new BlockSemaInfo(); 5286 5287 // Add BSI to CurBlock. 5288 BSI->PrevBlockInfo = CurBlock; 5289 CurBlock = BSI; 5290 5291 BSI->ReturnType = QualType(); 5292 BSI->TheScope = BlockScope; 5293 BSI->hasBlockDeclRefExprs = false; 5294 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5295 CurFunctionNeedsScopeChecking = false; 5296 5297 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5298 PushDeclContext(BlockScope, BSI->TheDecl); 5299} 5300 5301void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5302 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5303 5304 if (ParamInfo.getNumTypeObjects() == 0 5305 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5306 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5307 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5308 5309 if (T->isArrayType()) { 5310 Diag(ParamInfo.getSourceRange().getBegin(), 5311 diag::err_block_returns_array); 5312 return; 5313 } 5314 5315 // The parameter list is optional, if there was none, assume (). 5316 if (!T->isFunctionType()) 5317 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5318 5319 CurBlock->hasPrototype = true; 5320 CurBlock->isVariadic = false; 5321 // Check for a valid sentinel attribute on this block.
|
5229 if (CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) {
| 5322 if (CurBlock->TheDecl->getAttr()) {
|
5230 Diag(ParamInfo.getAttributes()->getLoc(), 5231 diag::warn_attribute_sentinel_not_variadic) << 1; 5232 // FIXME: remove the attribute. 5233 } 5234 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5235 5236 // Do not allow returning a objc interface by-value. 5237 if (RetTy->isObjCInterfaceType()) { 5238 Diag(ParamInfo.getSourceRange().getBegin(), 5239 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5240 return; 5241 } 5242 return; 5243 } 5244 5245 // Analyze arguments to block. 5246 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5247 "Not a function declarator!"); 5248 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5249 5250 CurBlock->hasPrototype = FTI.hasPrototype; 5251 CurBlock->isVariadic = true; 5252 5253 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5254 // no arguments, not a function that takes a single void argument. 5255 if (FTI.hasPrototype && 5256 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5257 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5258 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5259 // empty arg list, don't push any params. 5260 CurBlock->isVariadic = false; 5261 } else if (FTI.hasPrototype) { 5262 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5263 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5264 CurBlock->isVariadic = FTI.isVariadic; 5265 } 5266 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5267 CurBlock->Params.size()); 5268 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5269 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5270 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5271 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5272 // If this has an identifier, add it to the scope stack. 5273 if ((*AI)->getIdentifier()) 5274 PushOnScopeChains(*AI, CurBlock->TheScope); 5275 5276 // Check for a valid sentinel attribute on this block. 5277 if (!CurBlock->isVariadic &&
| 5323 Diag(ParamInfo.getAttributes()->getLoc(), 5324 diag::warn_attribute_sentinel_not_variadic) << 1; 5325 // FIXME: remove the attribute. 5326 } 5327 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5328 5329 // Do not allow returning a objc interface by-value. 5330 if (RetTy->isObjCInterfaceType()) { 5331 Diag(ParamInfo.getSourceRange().getBegin(), 5332 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5333 return; 5334 } 5335 return; 5336 } 5337 5338 // Analyze arguments to block. 5339 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5340 "Not a function declarator!"); 5341 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5342 5343 CurBlock->hasPrototype = FTI.hasPrototype; 5344 CurBlock->isVariadic = true; 5345 5346 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5347 // no arguments, not a function that takes a single void argument. 5348 if (FTI.hasPrototype && 5349 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5350 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5351 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5352 // empty arg list, don't push any params. 5353 CurBlock->isVariadic = false; 5354 } else if (FTI.hasPrototype) { 5355 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5356 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5357 CurBlock->isVariadic = FTI.isVariadic; 5358 } 5359 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5360 CurBlock->Params.size()); 5361 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5362 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5363 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5364 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5365 // If this has an identifier, add it to the scope stack. 5366 if ((*AI)->getIdentifier()) 5367 PushOnScopeChains(*AI, CurBlock->TheScope); 5368 5369 // Check for a valid sentinel attribute on this block. 5370 if (!CurBlock->isVariadic &&
|
5278 CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) {
| 5371 CurBlock->TheDecl->getAttr()) {
|
5279 Diag(ParamInfo.getAttributes()->getLoc(), 5280 diag::warn_attribute_sentinel_not_variadic) << 1; 5281 // FIXME: remove the attribute. 5282 } 5283 5284 // Analyze the return type. 5285 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5286 QualType RetTy = T->getAsFunctionType()->getResultType(); 5287 5288 // Do not allow returning a objc interface by-value. 5289 if (RetTy->isObjCInterfaceType()) { 5290 Diag(ParamInfo.getSourceRange().getBegin(), 5291 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5292 } else if (!RetTy->isDependentType()) 5293 CurBlock->ReturnType = RetTy; 5294} 5295 5296/// ActOnBlockError - If there is an error parsing a block, this callback 5297/// is invoked to pop the information about the block from the action impl. 5298void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5299 // Ensure that CurBlock is deleted. 5300 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5301 5302 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5303 5304 // Pop off CurBlock, handle nested blocks. 5305 PopDeclContext(); 5306 CurBlock = CurBlock->PrevBlockInfo; 5307 // FIXME: Delete the ParmVarDecl objects as well??? 5308} 5309 5310/// ActOnBlockStmtExpr - This is called when the body of a block statement 5311/// literal was successfully completed. ^(int x){...} 5312Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5313 StmtArg body, Scope *CurScope) { 5314 // If blocks are disabled, emit an error. 5315 if (!LangOpts.Blocks) 5316 Diag(CaretLoc, diag::err_blocks_disable); 5317 5318 // Ensure that CurBlock is deleted. 5319 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5320 5321 PopDeclContext(); 5322 5323 // Pop off CurBlock, handle nested blocks. 5324 CurBlock = CurBlock->PrevBlockInfo; 5325 5326 QualType RetTy = Context.VoidTy; 5327 if (!BSI->ReturnType.isNull()) 5328 RetTy = BSI->ReturnType; 5329 5330 llvm::SmallVector<QualType, 8> ArgTypes; 5331 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5332 ArgTypes.push_back(BSI->Params[i]->getType()); 5333 5334 QualType BlockTy; 5335 if (!BSI->hasPrototype) 5336 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5337 else 5338 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5339 BSI->isVariadic, 0); 5340 5341 // FIXME: Check that return/parameter types are complete/non-abstract 5342 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5343 BlockTy = Context.getBlockPointerType(BlockTy); 5344 5345 // If needed, diagnose invalid gotos and switches in the block. 5346 if (CurFunctionNeedsScopeChecking) 5347 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5348 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5349 5350 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5351 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5352 BSI->hasBlockDeclRefExprs)); 5353} 5354 5355Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5356 ExprArg expr, TypeTy *type, 5357 SourceLocation RPLoc) { 5358 QualType T = QualType::getFromOpaquePtr(type); 5359 Expr *E = static_cast<Expr*>(expr.get()); 5360 Expr *OrigExpr = E; 5361 5362 InitBuiltinVaListType(); 5363 5364 // Get the va_list type 5365 QualType VaListType = Context.getBuiltinVaListType(); 5366 if (VaListType->isArrayType()) { 5367 // Deal with implicit array decay; for example, on x86-64, 5368 // va_list is an array, but it's supposed to decay to 5369 // a pointer for va_arg. 5370 VaListType = Context.getArrayDecayedType(VaListType); 5371 // Make sure the input expression also decays appropriately. 5372 UsualUnaryConversions(E); 5373 } else { 5374 // Otherwise, the va_list argument must be an l-value because 5375 // it is modified by va_arg. 5376 if (!E->isTypeDependent() && 5377 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5378 return ExprError(); 5379 } 5380 5381 if (!E->isTypeDependent() && 5382 !Context.hasSameType(VaListType, E->getType())) { 5383 return ExprError(Diag(E->getLocStart(), 5384 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5385 << OrigExpr->getType() << E->getSourceRange()); 5386 } 5387 5388 // FIXME: Check that type is complete/non-abstract 5389 // FIXME: Warn if a non-POD type is passed in. 5390 5391 expr.release(); 5392 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5393 RPLoc)); 5394} 5395 5396Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5397 // The type of __null will be int or long, depending on the size of 5398 // pointers on the target. 5399 QualType Ty; 5400 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5401 Ty = Context.IntTy; 5402 else 5403 Ty = Context.LongTy; 5404 5405 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5406} 5407 5408bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5409 SourceLocation Loc, 5410 QualType DstType, QualType SrcType, 5411 Expr *SrcExpr, const char *Flavor) { 5412 // Decode the result (notice that AST's are still created for extensions). 5413 bool isInvalid = false; 5414 unsigned DiagKind; 5415 switch (ConvTy) { 5416 default: assert(0 && "Unknown conversion type"); 5417 case Compatible: return false; 5418 case PointerToInt: 5419 DiagKind = diag::ext_typecheck_convert_pointer_int; 5420 break; 5421 case IntToPointer: 5422 DiagKind = diag::ext_typecheck_convert_int_pointer; 5423 break; 5424 case IncompatiblePointer: 5425 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5426 break; 5427 case IncompatiblePointerSign: 5428 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5429 break; 5430 case FunctionVoidPointer: 5431 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5432 break; 5433 case CompatiblePointerDiscardsQualifiers: 5434 // If the qualifiers lost were because we were applying the 5435 // (deprecated) C++ conversion from a string literal to a char* 5436 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5437 // Ideally, this check would be performed in 5438 // CheckPointerTypesForAssignment. However, that would require a 5439 // bit of refactoring (so that the second argument is an 5440 // expression, rather than a type), which should be done as part 5441 // of a larger effort to fix CheckPointerTypesForAssignment for 5442 // C++ semantics. 5443 if (getLangOptions().CPlusPlus && 5444 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5445 return false; 5446 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5447 break; 5448 case IntToBlockPointer: 5449 DiagKind = diag::err_int_to_block_pointer; 5450 break; 5451 case IncompatibleBlockPointer: 5452 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5453 break; 5454 case IncompatibleObjCQualifiedId: 5455 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5456 // it can give a more specific diagnostic. 5457 DiagKind = diag::warn_incompatible_qualified_id; 5458 break; 5459 case IncompatibleVectors: 5460 DiagKind = diag::warn_incompatible_vectors; 5461 break; 5462 case Incompatible: 5463 DiagKind = diag::err_typecheck_convert_incompatible; 5464 isInvalid = true; 5465 break; 5466 } 5467 5468 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5469 << SrcExpr->getSourceRange(); 5470 return isInvalid; 5471} 5472 5473bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5474 llvm::APSInt ICEResult; 5475 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5476 if (Result) 5477 *Result = ICEResult; 5478 return false; 5479 } 5480 5481 Expr::EvalResult EvalResult; 5482 5483 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5484 EvalResult.HasSideEffects) { 5485 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5486 5487 if (EvalResult.Diag) { 5488 // We only show the note if it's not the usual "invalid subexpression" 5489 // or if it's actually in a subexpression. 5490 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5491 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5492 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5493 } 5494 5495 return true; 5496 } 5497 5498 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5499 E->getSourceRange(); 5500 5501 if (EvalResult.Diag && 5502 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5503 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5504 5505 if (Result) 5506 *Result = EvalResult.Val.getInt(); 5507 return false; 5508} 5509 5510Sema::ExpressionEvaluationContext 5511Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5512 // Introduce a new set of potentially referenced declarations to the stack. 5513 if (NewContext == PotentiallyPotentiallyEvaluated) 5514 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5515 5516 std::swap(ExprEvalContext, NewContext); 5517 return NewContext; 5518} 5519 5520void 5521Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5522 ExpressionEvaluationContext NewContext) { 5523 ExprEvalContext = NewContext; 5524 5525 if (OldContext == PotentiallyPotentiallyEvaluated) { 5526 // Mark any remaining declarations in the current position of the stack 5527 // as "referenced". If they were not meant to be referenced, semantic 5528 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5529 PotentiallyReferencedDecls RemainingDecls; 5530 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5531 PotentiallyReferencedDeclStack.pop_back(); 5532 5533 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5534 IEnd = RemainingDecls.end(); 5535 I != IEnd; ++I) 5536 MarkDeclarationReferenced(I->first, I->second); 5537 } 5538} 5539 5540/// \brief Note that the given declaration was referenced in the source code. 5541/// 5542/// This routine should be invoke whenever a given declaration is referenced 5543/// in the source code, and where that reference occurred. If this declaration 5544/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5545/// C99 6.9p3), then the declaration will be marked as used. 5546/// 5547/// \param Loc the location where the declaration was referenced. 5548/// 5549/// \param D the declaration that has been referenced by the source code. 5550void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5551 assert(D && "No declaration?"); 5552 5553 if (D->isUsed()) 5554 return; 5555 5556 // Mark a parameter declaration "used", regardless of whether we're in a 5557 // template or not. 5558 if (isa<ParmVarDecl>(D)) 5559 D->setUsed(true); 5560 5561 // Do not mark anything as "used" within a dependent context; wait for 5562 // an instantiation. 5563 if (CurContext->isDependentContext()) 5564 return; 5565 5566 switch (ExprEvalContext) { 5567 case Unevaluated: 5568 // We are in an expression that is not potentially evaluated; do nothing. 5569 return; 5570 5571 case PotentiallyEvaluated: 5572 // We are in a potentially-evaluated expression, so this declaration is 5573 // "used"; handle this below. 5574 break; 5575 5576 case PotentiallyPotentiallyEvaluated: 5577 // We are in an expression that may be potentially evaluated; queue this 5578 // declaration reference until we know whether the expression is 5579 // potentially evaluated. 5580 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5581 return; 5582 } 5583 5584 // Note that this declaration has been used. 5585 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5586 unsigned TypeQuals; 5587 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5588 if (!Constructor->isUsed()) 5589 DefineImplicitDefaultConstructor(Loc, Constructor); 5590 } 5591 else if (Constructor->isImplicit() && 5592 Constructor->isCopyConstructor(Context, TypeQuals)) { 5593 if (!Constructor->isUsed()) 5594 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5595 } 5596 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 5597 if (Destructor->isImplicit() && !Destructor->isUsed()) 5598 DefineImplicitDestructor(Loc, Destructor); 5599 5600 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 5601 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 5602 MethodDecl->getOverloadedOperator() == OO_Equal) { 5603 if (!MethodDecl->isUsed()) 5604 DefineImplicitOverloadedAssign(Loc, MethodDecl); 5605 } 5606 } 5607 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5608 // Implicit instantiation of function templates and member functions of 5609 // class templates.
| 5372 Diag(ParamInfo.getAttributes()->getLoc(), 5373 diag::warn_attribute_sentinel_not_variadic) << 1; 5374 // FIXME: remove the attribute. 5375 } 5376 5377 // Analyze the return type. 5378 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5379 QualType RetTy = T->getAsFunctionType()->getResultType(); 5380 5381 // Do not allow returning a objc interface by-value. 5382 if (RetTy->isObjCInterfaceType()) { 5383 Diag(ParamInfo.getSourceRange().getBegin(), 5384 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5385 } else if (!RetTy->isDependentType()) 5386 CurBlock->ReturnType = RetTy; 5387} 5388 5389/// ActOnBlockError - If there is an error parsing a block, this callback 5390/// is invoked to pop the information about the block from the action impl. 5391void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5392 // Ensure that CurBlock is deleted. 5393 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5394 5395 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5396 5397 // Pop off CurBlock, handle nested blocks. 5398 PopDeclContext(); 5399 CurBlock = CurBlock->PrevBlockInfo; 5400 // FIXME: Delete the ParmVarDecl objects as well??? 5401} 5402 5403/// ActOnBlockStmtExpr - This is called when the body of a block statement 5404/// literal was successfully completed. ^(int x){...} 5405Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5406 StmtArg body, Scope *CurScope) { 5407 // If blocks are disabled, emit an error. 5408 if (!LangOpts.Blocks) 5409 Diag(CaretLoc, diag::err_blocks_disable); 5410 5411 // Ensure that CurBlock is deleted. 5412 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5413 5414 PopDeclContext(); 5415 5416 // Pop off CurBlock, handle nested blocks. 5417 CurBlock = CurBlock->PrevBlockInfo; 5418 5419 QualType RetTy = Context.VoidTy; 5420 if (!BSI->ReturnType.isNull()) 5421 RetTy = BSI->ReturnType; 5422 5423 llvm::SmallVector<QualType, 8> ArgTypes; 5424 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5425 ArgTypes.push_back(BSI->Params[i]->getType()); 5426 5427 QualType BlockTy; 5428 if (!BSI->hasPrototype) 5429 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5430 else 5431 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5432 BSI->isVariadic, 0); 5433 5434 // FIXME: Check that return/parameter types are complete/non-abstract 5435 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5436 BlockTy = Context.getBlockPointerType(BlockTy); 5437 5438 // If needed, diagnose invalid gotos and switches in the block. 5439 if (CurFunctionNeedsScopeChecking) 5440 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5441 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5442 5443 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5444 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5445 BSI->hasBlockDeclRefExprs)); 5446} 5447 5448Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5449 ExprArg expr, TypeTy *type, 5450 SourceLocation RPLoc) { 5451 QualType T = QualType::getFromOpaquePtr(type); 5452 Expr *E = static_cast<Expr*>(expr.get()); 5453 Expr *OrigExpr = E; 5454 5455 InitBuiltinVaListType(); 5456 5457 // Get the va_list type 5458 QualType VaListType = Context.getBuiltinVaListType(); 5459 if (VaListType->isArrayType()) { 5460 // Deal with implicit array decay; for example, on x86-64, 5461 // va_list is an array, but it's supposed to decay to 5462 // a pointer for va_arg. 5463 VaListType = Context.getArrayDecayedType(VaListType); 5464 // Make sure the input expression also decays appropriately. 5465 UsualUnaryConversions(E); 5466 } else { 5467 // Otherwise, the va_list argument must be an l-value because 5468 // it is modified by va_arg. 5469 if (!E->isTypeDependent() && 5470 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5471 return ExprError(); 5472 } 5473 5474 if (!E->isTypeDependent() && 5475 !Context.hasSameType(VaListType, E->getType())) { 5476 return ExprError(Diag(E->getLocStart(), 5477 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5478 << OrigExpr->getType() << E->getSourceRange()); 5479 } 5480 5481 // FIXME: Check that type is complete/non-abstract 5482 // FIXME: Warn if a non-POD type is passed in. 5483 5484 expr.release(); 5485 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5486 RPLoc)); 5487} 5488 5489Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5490 // The type of __null will be int or long, depending on the size of 5491 // pointers on the target. 5492 QualType Ty; 5493 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5494 Ty = Context.IntTy; 5495 else 5496 Ty = Context.LongTy; 5497 5498 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5499} 5500 5501bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5502 SourceLocation Loc, 5503 QualType DstType, QualType SrcType, 5504 Expr *SrcExpr, const char *Flavor) { 5505 // Decode the result (notice that AST's are still created for extensions). 5506 bool isInvalid = false; 5507 unsigned DiagKind; 5508 switch (ConvTy) { 5509 default: assert(0 && "Unknown conversion type"); 5510 case Compatible: return false; 5511 case PointerToInt: 5512 DiagKind = diag::ext_typecheck_convert_pointer_int; 5513 break; 5514 case IntToPointer: 5515 DiagKind = diag::ext_typecheck_convert_int_pointer; 5516 break; 5517 case IncompatiblePointer: 5518 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5519 break; 5520 case IncompatiblePointerSign: 5521 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5522 break; 5523 case FunctionVoidPointer: 5524 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5525 break; 5526 case CompatiblePointerDiscardsQualifiers: 5527 // If the qualifiers lost were because we were applying the 5528 // (deprecated) C++ conversion from a string literal to a char* 5529 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5530 // Ideally, this check would be performed in 5531 // CheckPointerTypesForAssignment. However, that would require a 5532 // bit of refactoring (so that the second argument is an 5533 // expression, rather than a type), which should be done as part 5534 // of a larger effort to fix CheckPointerTypesForAssignment for 5535 // C++ semantics. 5536 if (getLangOptions().CPlusPlus && 5537 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5538 return false; 5539 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5540 break; 5541 case IntToBlockPointer: 5542 DiagKind = diag::err_int_to_block_pointer; 5543 break; 5544 case IncompatibleBlockPointer: 5545 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5546 break; 5547 case IncompatibleObjCQualifiedId: 5548 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5549 // it can give a more specific diagnostic. 5550 DiagKind = diag::warn_incompatible_qualified_id; 5551 break; 5552 case IncompatibleVectors: 5553 DiagKind = diag::warn_incompatible_vectors; 5554 break; 5555 case Incompatible: 5556 DiagKind = diag::err_typecheck_convert_incompatible; 5557 isInvalid = true; 5558 break; 5559 } 5560 5561 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5562 << SrcExpr->getSourceRange(); 5563 return isInvalid; 5564} 5565 5566bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5567 llvm::APSInt ICEResult; 5568 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5569 if (Result) 5570 *Result = ICEResult; 5571 return false; 5572 } 5573 5574 Expr::EvalResult EvalResult; 5575 5576 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5577 EvalResult.HasSideEffects) { 5578 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5579 5580 if (EvalResult.Diag) { 5581 // We only show the note if it's not the usual "invalid subexpression" 5582 // or if it's actually in a subexpression. 5583 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5584 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5585 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5586 } 5587 5588 return true; 5589 } 5590 5591 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5592 E->getSourceRange(); 5593 5594 if (EvalResult.Diag && 5595 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5596 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5597 5598 if (Result) 5599 *Result = EvalResult.Val.getInt(); 5600 return false; 5601} 5602 5603Sema::ExpressionEvaluationContext 5604Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5605 // Introduce a new set of potentially referenced declarations to the stack. 5606 if (NewContext == PotentiallyPotentiallyEvaluated) 5607 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5608 5609 std::swap(ExprEvalContext, NewContext); 5610 return NewContext; 5611} 5612 5613void 5614Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5615 ExpressionEvaluationContext NewContext) { 5616 ExprEvalContext = NewContext; 5617 5618 if (OldContext == PotentiallyPotentiallyEvaluated) { 5619 // Mark any remaining declarations in the current position of the stack 5620 // as "referenced". If they were not meant to be referenced, semantic 5621 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5622 PotentiallyReferencedDecls RemainingDecls; 5623 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5624 PotentiallyReferencedDeclStack.pop_back(); 5625 5626 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5627 IEnd = RemainingDecls.end(); 5628 I != IEnd; ++I) 5629 MarkDeclarationReferenced(I->first, I->second); 5630 } 5631} 5632 5633/// \brief Note that the given declaration was referenced in the source code. 5634/// 5635/// This routine should be invoke whenever a given declaration is referenced 5636/// in the source code, and where that reference occurred. If this declaration 5637/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5638/// C99 6.9p3), then the declaration will be marked as used. 5639/// 5640/// \param Loc the location where the declaration was referenced. 5641/// 5642/// \param D the declaration that has been referenced by the source code. 5643void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5644 assert(D && "No declaration?"); 5645 5646 if (D->isUsed()) 5647 return; 5648 5649 // Mark a parameter declaration "used", regardless of whether we're in a 5650 // template or not. 5651 if (isa<ParmVarDecl>(D)) 5652 D->setUsed(true); 5653 5654 // Do not mark anything as "used" within a dependent context; wait for 5655 // an instantiation. 5656 if (CurContext->isDependentContext()) 5657 return; 5658 5659 switch (ExprEvalContext) { 5660 case Unevaluated: 5661 // We are in an expression that is not potentially evaluated; do nothing. 5662 return; 5663 5664 case PotentiallyEvaluated: 5665 // We are in a potentially-evaluated expression, so this declaration is 5666 // "used"; handle this below. 5667 break; 5668 5669 case PotentiallyPotentiallyEvaluated: 5670 // We are in an expression that may be potentially evaluated; queue this 5671 // declaration reference until we know whether the expression is 5672 // potentially evaluated. 5673 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5674 return; 5675 } 5676 5677 // Note that this declaration has been used. 5678 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5679 unsigned TypeQuals; 5680 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5681 if (!Constructor->isUsed()) 5682 DefineImplicitDefaultConstructor(Loc, Constructor); 5683 } 5684 else if (Constructor->isImplicit() && 5685 Constructor->isCopyConstructor(Context, TypeQuals)) { 5686 if (!Constructor->isUsed()) 5687 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5688 } 5689 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 5690 if (Destructor->isImplicit() && !Destructor->isUsed()) 5691 DefineImplicitDestructor(Loc, Destructor); 5692 5693 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 5694 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 5695 MethodDecl->getOverloadedOperator() == OO_Equal) { 5696 if (!MethodDecl->isUsed()) 5697 DefineImplicitOverloadedAssign(Loc, MethodDecl); 5698 } 5699 } 5700 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5701 // Implicit instantiation of function templates and member functions of 5702 // class templates.
|
5610 if (!Function->getBody(Context)) {
| 5703 if (!Function->getBody()) {
|
5611 // FIXME: distinguish between implicit instantiations of function 5612 // templates and explicit specializations (the latter don't get 5613 // instantiated, naturally). 5614 if (Function->getInstantiatedFromMemberFunction() || 5615 Function->getPrimaryTemplate())
| 5704 // FIXME: distinguish between implicit instantiations of function 5705 // templates and explicit specializations (the latter don't get 5706 // instantiated, naturally). 5707 if (Function->getInstantiatedFromMemberFunction() || 5708 Function->getPrimaryTemplate())
|
5616 PendingImplicitInstantiations.push(std::make_pair(Function, Loc));
| 5709 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc));
|
5617 } 5618 5619 5620 // FIXME: keep track of references to static functions 5621 Function->setUsed(true); 5622 return; 5623 } 5624 5625 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5626 (void)Var; 5627 // FIXME: implicit template instantiation 5628 // FIXME: keep track of references to static data? 5629 D->setUsed(true); 5630 } 5631} 5632
| 5710 } 5711 5712 5713 // FIXME: keep track of references to static functions 5714 Function->setUsed(true); 5715 return; 5716 } 5717 5718 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5719 (void)Var; 5720 // FIXME: implicit template instantiation 5721 // FIXME: keep track of references to static data? 5722 D->setUsed(true); 5723 } 5724} 5725
|