1//===--- ParseExpr.cpp - Expression Parsing -------------------------------===// 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/// \file 11/// \brief Provides the Expression parsing implementation. 12/// 13/// Expressions in C99 basically consist of a bunch of binary operators with 14/// unary operators and other random stuff at the leaves. 15/// 16/// In the C99 grammar, these unary operators bind tightest and are represented 17/// as the 'cast-expression' production. Everything else is either a binary 18/// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are 19/// handled by ParseCastExpression, the higher level pieces are handled by 20/// ParseBinaryExpression. 21/// 22//===----------------------------------------------------------------------===// 23 24#include "clang/Parse/Parser.h" 25#include "RAIIObjectsForParser.h" 26#include "clang/Basic/PrettyStackTrace.h" 27#include "clang/Sema/DeclSpec.h" 28#include "clang/Sema/ParsedTemplate.h" 29#include "clang/Sema/Scope.h" 30#include "clang/Sema/TypoCorrection.h" 31#include "llvm/ADT/SmallString.h" 32#include "llvm/ADT/SmallVector.h" 33using namespace clang; 34 35/// \brief Simple precedence-based parser for binary/ternary operators. 36/// 37/// Note: we diverge from the C99 grammar when parsing the assignment-expression 38/// production. C99 specifies that the LHS of an assignment operator should be 39/// parsed as a unary-expression, but consistency dictates that it be a 40/// conditional-expession. In practice, the important thing here is that the 41/// LHS of an assignment has to be an l-value, which productions between 42/// unary-expression and conditional-expression don't produce. Because we want 43/// consistency, we parse the LHS as a conditional-expression, then check for 44/// l-value-ness in semantic analysis stages. 45/// 46/// \verbatim 47/// pm-expression: [C++ 5.5] 48/// cast-expression 49/// pm-expression '.*' cast-expression 50/// pm-expression '->*' cast-expression 51/// 52/// multiplicative-expression: [C99 6.5.5] 53/// Note: in C++, apply pm-expression instead of cast-expression 54/// cast-expression 55/// multiplicative-expression '*' cast-expression 56/// multiplicative-expression '/' cast-expression 57/// multiplicative-expression '%' cast-expression 58/// 59/// additive-expression: [C99 6.5.6] 60/// multiplicative-expression 61/// additive-expression '+' multiplicative-expression 62/// additive-expression '-' multiplicative-expression 63/// 64/// shift-expression: [C99 6.5.7] 65/// additive-expression 66/// shift-expression '<<' additive-expression 67/// shift-expression '>>' additive-expression 68/// 69/// relational-expression: [C99 6.5.8] 70/// shift-expression 71/// relational-expression '<' shift-expression 72/// relational-expression '>' shift-expression 73/// relational-expression '<=' shift-expression 74/// relational-expression '>=' shift-expression 75/// 76/// equality-expression: [C99 6.5.9] 77/// relational-expression 78/// equality-expression '==' relational-expression 79/// equality-expression '!=' relational-expression 80/// 81/// AND-expression: [C99 6.5.10] 82/// equality-expression 83/// AND-expression '&' equality-expression 84/// 85/// exclusive-OR-expression: [C99 6.5.11] 86/// AND-expression 87/// exclusive-OR-expression '^' AND-expression 88/// 89/// inclusive-OR-expression: [C99 6.5.12] 90/// exclusive-OR-expression 91/// inclusive-OR-expression '|' exclusive-OR-expression 92/// 93/// logical-AND-expression: [C99 6.5.13] 94/// inclusive-OR-expression 95/// logical-AND-expression '&&' inclusive-OR-expression 96/// 97/// logical-OR-expression: [C99 6.5.14] 98/// logical-AND-expression 99/// logical-OR-expression '||' logical-AND-expression 100/// 101/// conditional-expression: [C99 6.5.15] 102/// logical-OR-expression 103/// logical-OR-expression '?' expression ':' conditional-expression 104/// [GNU] logical-OR-expression '?' ':' conditional-expression 105/// [C++] the third operand is an assignment-expression 106/// 107/// assignment-expression: [C99 6.5.16] 108/// conditional-expression 109/// unary-expression assignment-operator assignment-expression 110/// [C++] throw-expression [C++ 15] 111/// 112/// assignment-operator: one of 113/// = *= /= %= += -= <<= >>= &= ^= |= 114/// 115/// expression: [C99 6.5.17] 116/// assignment-expression ...[opt] 117/// expression ',' assignment-expression ...[opt] 118/// \endverbatim 119ExprResult Parser::ParseExpression(TypeCastState isTypeCast) { 120 ExprResult LHS(ParseAssignmentExpression(isTypeCast)); 121 return ParseRHSOfBinaryExpression(LHS, prec::Comma); 122} 123 124/// This routine is called when the '@' is seen and consumed. 125/// Current token is an Identifier and is not a 'try'. This 126/// routine is necessary to disambiguate \@try-statement from, 127/// for example, \@encode-expression. 128/// 129ExprResult 130Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) { 131 ExprResult LHS(ParseObjCAtExpression(AtLoc)); 132 return ParseRHSOfBinaryExpression(LHS, prec::Comma); 133} 134 135/// This routine is called when a leading '__extension__' is seen and 136/// consumed. This is necessary because the token gets consumed in the 137/// process of disambiguating between an expression and a declaration. 138ExprResult 139Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) { 140 ExprResult LHS(true); 141 { 142 // Silence extension warnings in the sub-expression 143 ExtensionRAIIObject O(Diags); 144 145 LHS = ParseCastExpression(false); 146 } 147 148 if (!LHS.isInvalid()) 149 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__, 150 LHS.take()); 151 152 return ParseRHSOfBinaryExpression(LHS, prec::Comma); 153} 154 155/// \brief Parse an expr that doesn't include (top-level) commas. 156ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) { 157 if (Tok.is(tok::code_completion)) { 158 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 159 cutOffParsing(); 160 return ExprError(); 161 } 162 163 if (Tok.is(tok::kw_throw)) 164 return ParseThrowExpression(); 165 166 ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false, 167 /*isAddressOfOperand=*/false, 168 isTypeCast); 169 return ParseRHSOfBinaryExpression(LHS, prec::Assignment); 170} 171 172/// \brief Parse an assignment expression where part of an Objective-C message 173/// send has already been parsed. 174/// 175/// In this case \p LBracLoc indicates the location of the '[' of the message 176/// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating 177/// the receiver of the message. 178/// 179/// Since this handles full assignment-expression's, it handles postfix 180/// expressions and other binary operators for these expressions as well. 181ExprResult 182Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc, 183 SourceLocation SuperLoc, 184 ParsedType ReceiverType, 185 Expr *ReceiverExpr) { 186 ExprResult R 187 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc, 188 ReceiverType, ReceiverExpr); 189 R = ParsePostfixExpressionSuffix(R); 190 return ParseRHSOfBinaryExpression(R, prec::Assignment); 191} 192 193 194ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) { 195 // C++03 [basic.def.odr]p2: 196 // An expression is potentially evaluated unless it appears where an 197 // integral constant expression is required (see 5.19) [...]. 198 // C++98 and C++11 have no such rule, but this is only a defect in C++98. 199 EnterExpressionEvaluationContext Unevaluated(Actions, 200 Sema::ConstantEvaluated); 201 202 ExprResult LHS(ParseCastExpression(false, false, isTypeCast)); 203 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional)); 204 return Actions.ActOnConstantExpression(Res); 205} 206 207bool Parser::isNotExpressionStart() { 208 tok::TokenKind K = Tok.getKind(); 209 if (K == tok::l_brace || K == tok::r_brace || 210 K == tok::kw_for || K == tok::kw_while || 211 K == tok::kw_if || K == tok::kw_else || 212 K == tok::kw_goto || K == tok::kw_try) 213 return true; 214 // If this is a decl-specifier, we can't be at the start of an expression. 215 return isKnownToBeDeclarationSpecifier(); 216} 217 218/// \brief Parse a binary expression that starts with \p LHS and has a 219/// precedence of at least \p MinPrec. 220ExprResult 221Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) { 222 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(), 223 GreaterThanIsOperator, 224 getLangOpts().CPlusPlus11); 225 SourceLocation ColonLoc; 226 227 while (1) { 228 // If this token has a lower precedence than we are allowed to parse (e.g. 229 // because we are called recursively, or because the token is not a binop), 230 // then we are done! 231 if (NextTokPrec < MinPrec) 232 return LHS; 233 234 // Consume the operator, saving the operator token for error reporting. 235 Token OpToken = Tok; 236 ConsumeToken(); 237 238 // Bail out when encountering a comma followed by a token which can't 239 // possibly be the start of an expression. For instance: 240 // int f() { return 1, } 241 // We can't do this before consuming the comma, because 242 // isNotExpressionStart() looks at the token stream. 243 if (OpToken.is(tok::comma) && isNotExpressionStart()) { 244 PP.EnterToken(Tok); 245 Tok = OpToken; 246 return LHS; 247 } 248 249 // Special case handling for the ternary operator. 250 ExprResult TernaryMiddle(true); 251 if (NextTokPrec == prec::Conditional) { 252 if (Tok.isNot(tok::colon)) { 253 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 254 ColonProtectionRAIIObject X(*this); 255 256 // Handle this production specially: 257 // logical-OR-expression '?' expression ':' conditional-expression 258 // In particular, the RHS of the '?' is 'expression', not 259 // 'logical-OR-expression' as we might expect. 260 TernaryMiddle = ParseExpression(); 261 if (TernaryMiddle.isInvalid()) { 262 LHS = ExprError(); 263 TernaryMiddle = 0; 264 } 265 } else { 266 // Special case handling of "X ? Y : Z" where Y is empty: 267 // logical-OR-expression '?' ':' conditional-expression [GNU] 268 TernaryMiddle = 0; 269 Diag(Tok, diag::ext_gnu_conditional_expr); 270 } 271 272 if (Tok.is(tok::colon)) { 273 // Eat the colon. 274 ColonLoc = ConsumeToken(); 275 } else { 276 // Otherwise, we're missing a ':'. Assume that this was a typo that 277 // the user forgot. If we're not in a macro expansion, we can suggest 278 // a fixit hint. If there were two spaces before the current token, 279 // suggest inserting the colon in between them, otherwise insert ": ". 280 SourceLocation FILoc = Tok.getLocation(); 281 const char *FIText = ": "; 282 const SourceManager &SM = PP.getSourceManager(); 283 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) { 284 assert(FILoc.isFileID()); 285 bool IsInvalid = false; 286 const char *SourcePtr = 287 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid); 288 if (!IsInvalid && *SourcePtr == ' ') { 289 SourcePtr = 290 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid); 291 if (!IsInvalid && *SourcePtr == ' ') { 292 FILoc = FILoc.getLocWithOffset(-1); 293 FIText = ":"; 294 } 295 } 296 } 297 298 Diag(Tok, diag::err_expected_colon) 299 << FixItHint::CreateInsertion(FILoc, FIText); 300 Diag(OpToken, diag::note_matching) << "?"; 301 ColonLoc = Tok.getLocation(); 302 } 303 } 304 305 // Code completion for the right-hand side of an assignment expression 306 // goes through a special hook that takes the left-hand side into account. 307 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) { 308 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get()); 309 cutOffParsing(); 310 return ExprError(); 311 } 312 313 // Parse another leaf here for the RHS of the operator. 314 // ParseCastExpression works here because all RHS expressions in C have it 315 // as a prefix, at least. However, in C++, an assignment-expression could 316 // be a throw-expression, which is not a valid cast-expression. 317 // Therefore we need some special-casing here. 318 // Also note that the third operand of the conditional operator is 319 // an assignment-expression in C++, and in C++11, we can have a 320 // braced-init-list on the RHS of an assignment. For better diagnostics, 321 // parse as if we were allowed braced-init-lists everywhere, and check that 322 // they only appear on the RHS of assignments later. 323 ExprResult RHS; 324 bool RHSIsInitList = false; 325 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 326 RHS = ParseBraceInitializer(); 327 RHSIsInitList = true; 328 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional) 329 RHS = ParseAssignmentExpression(); 330 else 331 RHS = ParseCastExpression(false); 332 333 if (RHS.isInvalid()) 334 LHS = ExprError(); 335 336 // Remember the precedence of this operator and get the precedence of the 337 // operator immediately to the right of the RHS. 338 prec::Level ThisPrec = NextTokPrec; 339 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 340 getLangOpts().CPlusPlus11); 341 342 // Assignment and conditional expressions are right-associative. 343 bool isRightAssoc = ThisPrec == prec::Conditional || 344 ThisPrec == prec::Assignment; 345 346 // Get the precedence of the operator to the right of the RHS. If it binds 347 // more tightly with RHS than we do, evaluate it completely first. 348 if (ThisPrec < NextTokPrec || 349 (ThisPrec == NextTokPrec && isRightAssoc)) { 350 if (!RHS.isInvalid() && RHSIsInitList) { 351 Diag(Tok, diag::err_init_list_bin_op) 352 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get()); 353 RHS = ExprError(); 354 } 355 // If this is left-associative, only parse things on the RHS that bind 356 // more tightly than the current operator. If it is left-associative, it 357 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as 358 // A=(B=(C=D)), where each paren is a level of recursion here. 359 // The function takes ownership of the RHS. 360 RHS = ParseRHSOfBinaryExpression(RHS, 361 static_cast<prec::Level>(ThisPrec + !isRightAssoc)); 362 RHSIsInitList = false; 363 364 if (RHS.isInvalid()) 365 LHS = ExprError(); 366 367 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 368 getLangOpts().CPlusPlus11); 369 } 370 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!"); 371 372 if (!RHS.isInvalid() && RHSIsInitList) { 373 if (ThisPrec == prec::Assignment) { 374 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists) 375 << Actions.getExprRange(RHS.get()); 376 } else { 377 Diag(OpToken, diag::err_init_list_bin_op) 378 << /*RHS*/1 << PP.getSpelling(OpToken) 379 << Actions.getExprRange(RHS.get()); 380 LHS = ExprError(); 381 } 382 } 383 384 if (!LHS.isInvalid()) { 385 // Combine the LHS and RHS into the LHS (e.g. build AST). 386 if (TernaryMiddle.isInvalid()) { 387 // If we're using '>>' as an operator within a template 388 // argument list (in C++98), suggest the addition of 389 // parentheses so that the code remains well-formed in C++0x. 390 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater)) 391 SuggestParentheses(OpToken.getLocation(), 392 diag::warn_cxx11_right_shift_in_template_arg, 393 SourceRange(Actions.getExprRange(LHS.get()).getBegin(), 394 Actions.getExprRange(RHS.get()).getEnd())); 395 396 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(), 397 OpToken.getKind(), LHS.take(), RHS.take()); 398 } else 399 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc, 400 LHS.take(), TernaryMiddle.take(), 401 RHS.take()); 402 } 403 } 404} 405 406/// \brief Parse a cast-expression, or, if \p isUnaryExpression is true, 407/// parse a unary-expression. 408/// 409/// \p isAddressOfOperand exists because an id-expression that is the 410/// operand of address-of gets special treatment due to member pointers. 411/// 412ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 413 bool isAddressOfOperand, 414 TypeCastState isTypeCast) { 415 bool NotCastExpr; 416 ExprResult Res = ParseCastExpression(isUnaryExpression, 417 isAddressOfOperand, 418 NotCastExpr, 419 isTypeCast); 420 if (NotCastExpr) 421 Diag(Tok, diag::err_expected_expression); 422 return Res; 423} 424 425namespace { 426class CastExpressionIdValidator : public CorrectionCandidateCallback { 427 public: 428 CastExpressionIdValidator(bool AllowTypes, bool AllowNonTypes) 429 : AllowNonTypes(AllowNonTypes) { 430 WantTypeSpecifiers = AllowTypes; 431 } 432 433 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 434 NamedDecl *ND = candidate.getCorrectionDecl(); 435 if (!ND) 436 return candidate.isKeyword(); 437 438 if (isa<TypeDecl>(ND)) 439 return WantTypeSpecifiers; 440 return AllowNonTypes; 441 } 442 443 private: 444 bool AllowNonTypes; 445}; 446} 447 448/// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse 449/// a unary-expression. 450/// 451/// \p isAddressOfOperand exists because an id-expression that is the operand 452/// of address-of gets special treatment due to member pointers. NotCastExpr 453/// is set to true if the token is not the start of a cast-expression, and no 454/// diagnostic is emitted in this case. 455/// 456/// \verbatim 457/// cast-expression: [C99 6.5.4] 458/// unary-expression 459/// '(' type-name ')' cast-expression 460/// 461/// unary-expression: [C99 6.5.3] 462/// postfix-expression 463/// '++' unary-expression 464/// '--' unary-expression 465/// unary-operator cast-expression 466/// 'sizeof' unary-expression 467/// 'sizeof' '(' type-name ')' 468/// [C++11] 'sizeof' '...' '(' identifier ')' 469/// [GNU] '__alignof' unary-expression 470/// [GNU] '__alignof' '(' type-name ')' 471/// [C11] '_Alignof' '(' type-name ')' 472/// [C++11] 'alignof' '(' type-id ')' 473/// [GNU] '&&' identifier 474/// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7] 475/// [C++] new-expression 476/// [C++] delete-expression 477/// 478/// unary-operator: one of 479/// '&' '*' '+' '-' '~' '!' 480/// [GNU] '__extension__' '__real' '__imag' 481/// 482/// primary-expression: [C99 6.5.1] 483/// [C99] identifier 484/// [C++] id-expression 485/// constant 486/// string-literal 487/// [C++] boolean-literal [C++ 2.13.5] 488/// [C++11] 'nullptr' [C++11 2.14.7] 489/// [C++11] user-defined-literal 490/// '(' expression ')' 491/// [C11] generic-selection 492/// '__func__' [C99 6.4.2.2] 493/// [GNU] '__FUNCTION__' 494/// [MS] '__FUNCDNAME__' 495/// [MS] 'L__FUNCTION__' 496/// [GNU] '__PRETTY_FUNCTION__' 497/// [GNU] '(' compound-statement ')' 498/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 499/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 500/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 501/// assign-expr ')' 502/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 503/// [GNU] '__null' 504/// [OBJC] '[' objc-message-expr ']' 505/// [OBJC] '\@selector' '(' objc-selector-arg ')' 506/// [OBJC] '\@protocol' '(' identifier ')' 507/// [OBJC] '\@encode' '(' type-name ')' 508/// [OBJC] objc-string-literal 509/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 510/// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3] 511/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 512/// [C++11] typename-specifier braced-init-list [C++11 5.2.3] 513/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 514/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 515/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 516/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 517/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1] 518/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1] 519/// [C++] 'this' [C++ 9.3.2] 520/// [G++] unary-type-trait '(' type-id ')' 521/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO] 522/// [EMBT] array-type-trait '(' type-id ',' integer ')' 523/// [clang] '^' block-literal 524/// 525/// constant: [C99 6.4.4] 526/// integer-constant 527/// floating-constant 528/// enumeration-constant -> identifier 529/// character-constant 530/// 531/// id-expression: [C++ 5.1] 532/// unqualified-id 533/// qualified-id 534/// 535/// unqualified-id: [C++ 5.1] 536/// identifier 537/// operator-function-id 538/// conversion-function-id 539/// '~' class-name 540/// template-id 541/// 542/// new-expression: [C++ 5.3.4] 543/// '::'[opt] 'new' new-placement[opt] new-type-id 544/// new-initializer[opt] 545/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 546/// new-initializer[opt] 547/// 548/// delete-expression: [C++ 5.3.5] 549/// '::'[opt] 'delete' cast-expression 550/// '::'[opt] 'delete' '[' ']' cast-expression 551/// 552/// [GNU/Embarcadero] unary-type-trait: 553/// '__is_arithmetic' 554/// '__is_floating_point' 555/// '__is_integral' 556/// '__is_lvalue_expr' 557/// '__is_rvalue_expr' 558/// '__is_complete_type' 559/// '__is_void' 560/// '__is_array' 561/// '__is_function' 562/// '__is_reference' 563/// '__is_lvalue_reference' 564/// '__is_rvalue_reference' 565/// '__is_fundamental' 566/// '__is_object' 567/// '__is_scalar' 568/// '__is_compound' 569/// '__is_pointer' 570/// '__is_member_object_pointer' 571/// '__is_member_function_pointer' 572/// '__is_member_pointer' 573/// '__is_const' 574/// '__is_volatile' 575/// '__is_trivial' 576/// '__is_standard_layout' 577/// '__is_signed' 578/// '__is_unsigned' 579/// 580/// [GNU] unary-type-trait: 581/// '__has_nothrow_assign' 582/// '__has_nothrow_copy' 583/// '__has_nothrow_constructor' 584/// '__has_trivial_assign' [TODO] 585/// '__has_trivial_copy' [TODO] 586/// '__has_trivial_constructor' 587/// '__has_trivial_destructor' 588/// '__has_virtual_destructor' 589/// '__is_abstract' [TODO] 590/// '__is_class' 591/// '__is_empty' [TODO] 592/// '__is_enum' 593/// '__is_final' 594/// '__is_pod' 595/// '__is_polymorphic' 596/// '__is_sealed' [MS] 597/// '__is_trivial' 598/// '__is_union' 599/// 600/// [Clang] unary-type-trait: 601/// '__trivially_copyable' 602/// 603/// binary-type-trait: 604/// [GNU] '__is_base_of' 605/// [MS] '__is_convertible_to' 606/// '__is_convertible' 607/// '__is_same' 608/// 609/// [Embarcadero] array-type-trait: 610/// '__array_rank' 611/// '__array_extent' 612/// 613/// [Embarcadero] expression-trait: 614/// '__is_lvalue_expr' 615/// '__is_rvalue_expr' 616/// \endverbatim 617/// 618ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 619 bool isAddressOfOperand, 620 bool &NotCastExpr, 621 TypeCastState isTypeCast) { 622 ExprResult Res; 623 tok::TokenKind SavedKind = Tok.getKind(); 624 NotCastExpr = false; 625 626 // This handles all of cast-expression, unary-expression, postfix-expression, 627 // and primary-expression. We handle them together like this for efficiency 628 // and to simplify handling of an expression starting with a '(' token: which 629 // may be one of a parenthesized expression, cast-expression, compound literal 630 // expression, or statement expression. 631 // 632 // If the parsed tokens consist of a primary-expression, the cases below 633 // break out of the switch; at the end we call ParsePostfixExpressionSuffix 634 // to handle the postfix expression suffixes. Cases that cannot be followed 635 // by postfix exprs should return without invoking 636 // ParsePostfixExpressionSuffix. 637 switch (SavedKind) { 638 case tok::l_paren: { 639 // If this expression is limited to being a unary-expression, the parent can 640 // not start a cast expression. 641 ParenParseOption ParenExprType = 642 (isUnaryExpression && !getLangOpts().CPlusPlus)? CompoundLiteral : CastExpr; 643 ParsedType CastTy; 644 SourceLocation RParenLoc; 645 646 { 647 // The inside of the parens don't need to be a colon protected scope, and 648 // isn't immediately a message send. 649 ColonProtectionRAIIObject X(*this, false); 650 651 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/, 652 isTypeCast == IsTypeCast, CastTy, RParenLoc); 653 } 654 655 switch (ParenExprType) { 656 case SimpleExpr: break; // Nothing else to do. 657 case CompoundStmt: break; // Nothing else to do. 658 case CompoundLiteral: 659 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of 660 // postfix-expression exist, parse them now. 661 break; 662 case CastExpr: 663 // We have parsed the cast-expression and no postfix-expr pieces are 664 // following. 665 return Res; 666 } 667 668 break; 669 } 670 671 // primary-expression 672 case tok::numeric_constant: 673 // constant: integer-constant 674 // constant: floating-constant 675 676 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope()); 677 ConsumeToken(); 678 break; 679 680 case tok::kw_true: 681 case tok::kw_false: 682 return ParseCXXBoolLiteral(); 683 684 case tok::kw___objc_yes: 685 case tok::kw___objc_no: 686 return ParseObjCBoolLiteral(); 687 688 case tok::kw_nullptr: 689 Diag(Tok, diag::warn_cxx98_compat_nullptr); 690 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken()); 691 692 case tok::annot_primary_expr: 693 assert(Res.get() == 0 && "Stray primary-expression annotation?"); 694 Res = getExprAnnotation(Tok); 695 ConsumeToken(); 696 break; 697 698 case tok::kw_decltype: 699 // Annotate the token and tail recurse. 700 if (TryAnnotateTypeOrScopeToken()) 701 return ExprError(); 702 assert(Tok.isNot(tok::kw_decltype)); 703 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 704 705 case tok::identifier: { // primary-expression: identifier 706 // unqualified-id: identifier 707 // constant: enumeration-constant 708 // Turn a potentially qualified name into a annot_typename or 709 // annot_cxxscope if it would be valid. This handles things like x::y, etc. 710 if (getLangOpts().CPlusPlus) { 711 // Avoid the unnecessary parse-time lookup in the common case 712 // where the syntax forbids a type. 713 const Token &Next = NextToken(); 714 715 // If this identifier was reverted from a token ID, and the next token 716 // is a parenthesis, this is likely to be a use of a type trait. Check 717 // those tokens. 718 if (Next.is(tok::l_paren) && 719 Tok.is(tok::identifier) && 720 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) { 721 IdentifierInfo *II = Tok.getIdentifierInfo(); 722 // Build up the mapping of revertable type traits, for future use. 723 if (RevertableTypeTraits.empty()) { 724#define RTT_JOIN(X,Y) X##Y 725#define REVERTABLE_TYPE_TRAIT(Name) \ 726 RevertableTypeTraits[PP.getIdentifierInfo(#Name)] \ 727 = RTT_JOIN(tok::kw_,Name) 728 729 REVERTABLE_TYPE_TRAIT(__is_arithmetic); 730 REVERTABLE_TYPE_TRAIT(__is_convertible); 731 REVERTABLE_TYPE_TRAIT(__is_empty); 732 REVERTABLE_TYPE_TRAIT(__is_floating_point); 733 REVERTABLE_TYPE_TRAIT(__is_function); 734 REVERTABLE_TYPE_TRAIT(__is_fundamental); 735 REVERTABLE_TYPE_TRAIT(__is_integral); 736 REVERTABLE_TYPE_TRAIT(__is_member_function_pointer); 737 REVERTABLE_TYPE_TRAIT(__is_member_pointer); 738 REVERTABLE_TYPE_TRAIT(__is_pod); 739 REVERTABLE_TYPE_TRAIT(__is_pointer); 740 REVERTABLE_TYPE_TRAIT(__is_same); 741 REVERTABLE_TYPE_TRAIT(__is_scalar); 742 REVERTABLE_TYPE_TRAIT(__is_signed); 743 REVERTABLE_TYPE_TRAIT(__is_unsigned); 744 REVERTABLE_TYPE_TRAIT(__is_void); 745#undef REVERTABLE_TYPE_TRAIT 746#undef RTT_JOIN 747 } 748 749 // If we find that this is in fact the name of a type trait, 750 // update the token kind in place and parse again to treat it as 751 // the appropriate kind of type trait. 752 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known 753 = RevertableTypeTraits.find(II); 754 if (Known != RevertableTypeTraits.end()) { 755 Tok.setKind(Known->second); 756 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 757 NotCastExpr, isTypeCast); 758 } 759 } 760 761 if (Next.is(tok::coloncolon) || 762 (!ColonIsSacred && Next.is(tok::colon)) || 763 Next.is(tok::less) || 764 Next.is(tok::l_paren) || 765 Next.is(tok::l_brace)) { 766 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 767 if (TryAnnotateTypeOrScopeToken()) 768 return ExprError(); 769 if (!Tok.is(tok::identifier)) 770 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 771 } 772 } 773 774 // Consume the identifier so that we can see if it is followed by a '(' or 775 // '.'. 776 IdentifierInfo &II = *Tok.getIdentifierInfo(); 777 SourceLocation ILoc = ConsumeToken(); 778 779 // Support 'Class.property' and 'super.property' notation. 780 if (getLangOpts().ObjC1 && Tok.is(tok::period) && 781 (Actions.getTypeName(II, ILoc, getCurScope()) || 782 // Allow the base to be 'super' if in an objc-method. 783 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) { 784 ConsumeToken(); 785 786 // Allow either an identifier or the keyword 'class' (in C++). 787 if (Tok.isNot(tok::identifier) && 788 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) { 789 Diag(Tok, diag::err_expected_property_name); 790 return ExprError(); 791 } 792 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo(); 793 SourceLocation PropertyLoc = ConsumeToken(); 794 795 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName, 796 ILoc, PropertyLoc); 797 break; 798 } 799 800 // In an Objective-C method, if we have "super" followed by an identifier, 801 // the token sequence is ill-formed. However, if there's a ':' or ']' after 802 // that identifier, this is probably a message send with a missing open 803 // bracket. Treat it as such. 804 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression && 805 getCurScope()->isInObjcMethodScope() && 806 ((Tok.is(tok::identifier) && 807 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) || 808 Tok.is(tok::code_completion))) { 809 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 810 0); 811 break; 812 } 813 814 // If we have an Objective-C class name followed by an identifier 815 // and either ':' or ']', this is an Objective-C class message 816 // send that's missing the opening '['. Recovery 817 // appropriately. Also take this path if we're performing code 818 // completion after an Objective-C class name. 819 if (getLangOpts().ObjC1 && 820 ((Tok.is(tok::identifier) && !InMessageExpression) || 821 Tok.is(tok::code_completion))) { 822 const Token& Next = NextToken(); 823 if (Tok.is(tok::code_completion) || 824 Next.is(tok::colon) || Next.is(tok::r_square)) 825 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope())) 826 if (Typ.get()->isObjCObjectOrInterfaceType()) { 827 // Fake up a Declarator to use with ActOnTypeName. 828 DeclSpec DS(AttrFactory); 829 DS.SetRangeStart(ILoc); 830 DS.SetRangeEnd(ILoc); 831 const char *PrevSpec = 0; 832 unsigned DiagID; 833 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ); 834 835 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 836 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), 837 DeclaratorInfo); 838 if (Ty.isInvalid()) 839 break; 840 841 Res = ParseObjCMessageExpressionBody(SourceLocation(), 842 SourceLocation(), 843 Ty.get(), 0); 844 break; 845 } 846 } 847 848 // Make sure to pass down the right value for isAddressOfOperand. 849 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 850 isAddressOfOperand = false; 851 852 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we 853 // need to know whether or not this identifier is a function designator or 854 // not. 855 UnqualifiedId Name; 856 CXXScopeSpec ScopeSpec; 857 SourceLocation TemplateKWLoc; 858 CastExpressionIdValidator Validator(isTypeCast != NotTypeCast, 859 isTypeCast != IsTypeCast); 860 Name.setIdentifier(&II, ILoc); 861 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc, 862 Name, Tok.is(tok::l_paren), 863 isAddressOfOperand, &Validator); 864 break; 865 } 866 case tok::char_constant: // constant: character-constant 867 case tok::wide_char_constant: 868 case tok::utf16_char_constant: 869 case tok::utf32_char_constant: 870 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope()); 871 ConsumeToken(); 872 break; 873 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2] 874 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU] 875 case tok::kw___FUNCDNAME__: // primary-expression: __FUNCDNAME__ [MS] 876 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS] 877 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU] 878 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind); 879 ConsumeToken(); 880 break; 881 case tok::string_literal: // primary-expression: string-literal 882 case tok::wide_string_literal: 883 case tok::utf8_string_literal: 884 case tok::utf16_string_literal: 885 case tok::utf32_string_literal: 886 Res = ParseStringLiteralExpression(true); 887 break; 888 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1] 889 Res = ParseGenericSelectionExpression(); 890 break; 891 case tok::kw___builtin_va_arg: 892 case tok::kw___builtin_offsetof: 893 case tok::kw___builtin_choose_expr: 894 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type() 895 case tok::kw___builtin_convertvector: 896 return ParseBuiltinPrimaryExpression(); 897 case tok::kw___null: 898 return Actions.ActOnGNUNullExpr(ConsumeToken()); 899 900 case tok::plusplus: // unary-expression: '++' unary-expression [C99] 901 case tok::minusminus: { // unary-expression: '--' unary-expression [C99] 902 // C++ [expr.unary] has: 903 // unary-expression: 904 // ++ cast-expression 905 // -- cast-expression 906 SourceLocation SavedLoc = ConsumeToken(); 907 Res = ParseCastExpression(!getLangOpts().CPlusPlus); 908 if (!Res.isInvalid()) 909 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 910 return Res; 911 } 912 case tok::amp: { // unary-expression: '&' cast-expression 913 // Special treatment because of member pointers 914 SourceLocation SavedLoc = ConsumeToken(); 915 Res = ParseCastExpression(false, true); 916 if (!Res.isInvalid()) 917 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 918 return Res; 919 } 920 921 case tok::star: // unary-expression: '*' cast-expression 922 case tok::plus: // unary-expression: '+' cast-expression 923 case tok::minus: // unary-expression: '-' cast-expression 924 case tok::tilde: // unary-expression: '~' cast-expression 925 case tok::exclaim: // unary-expression: '!' cast-expression 926 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU] 927 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU] 928 SourceLocation SavedLoc = ConsumeToken(); 929 Res = ParseCastExpression(false); 930 if (!Res.isInvalid()) 931 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 932 return Res; 933 } 934 935 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU] 936 // __extension__ silences extension warnings in the subexpression. 937 ExtensionRAIIObject O(Diags); // Use RAII to do this. 938 SourceLocation SavedLoc = ConsumeToken(); 939 Res = ParseCastExpression(false); 940 if (!Res.isInvalid()) 941 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 942 return Res; 943 } 944 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')' 945 if (!getLangOpts().C11) 946 Diag(Tok, diag::ext_c11_alignment) << Tok.getName(); 947 // fallthrough 948 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')' 949 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression 950 // unary-expression: '__alignof' '(' type-name ')' 951 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression 952 // unary-expression: 'sizeof' '(' type-name ')' 953 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression 954 return ParseUnaryExprOrTypeTraitExpression(); 955 case tok::ampamp: { // unary-expression: '&&' identifier 956 SourceLocation AmpAmpLoc = ConsumeToken(); 957 if (Tok.isNot(tok::identifier)) 958 return ExprError(Diag(Tok, diag::err_expected_ident)); 959 960 if (getCurScope()->getFnParent() == 0) 961 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn)); 962 963 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label); 964 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), 965 Tok.getLocation()); 966 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD); 967 ConsumeToken(); 968 return Res; 969 } 970 case tok::kw_const_cast: 971 case tok::kw_dynamic_cast: 972 case tok::kw_reinterpret_cast: 973 case tok::kw_static_cast: 974 Res = ParseCXXCasts(); 975 break; 976 case tok::kw_typeid: 977 Res = ParseCXXTypeid(); 978 break; 979 case tok::kw___uuidof: 980 Res = ParseCXXUuidof(); 981 break; 982 case tok::kw_this: 983 Res = ParseCXXThis(); 984 break; 985 986 case tok::annot_typename: 987 if (isStartOfObjCClassMessageMissingOpenBracket()) { 988 ParsedType Type = getTypeAnnotation(Tok); 989 990 // Fake up a Declarator to use with ActOnTypeName. 991 DeclSpec DS(AttrFactory); 992 DS.SetRangeStart(Tok.getLocation()); 993 DS.SetRangeEnd(Tok.getLastLoc()); 994 995 const char *PrevSpec = 0; 996 unsigned DiagID; 997 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(), 998 PrevSpec, DiagID, Type); 999 1000 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1001 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 1002 if (Ty.isInvalid()) 1003 break; 1004 1005 ConsumeToken(); 1006 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1007 Ty.get(), 0); 1008 break; 1009 } 1010 // Fall through 1011 1012 case tok::annot_decltype: 1013 case tok::kw_char: 1014 case tok::kw_wchar_t: 1015 case tok::kw_char16_t: 1016 case tok::kw_char32_t: 1017 case tok::kw_bool: 1018 case tok::kw_short: 1019 case tok::kw_int: 1020 case tok::kw_long: 1021 case tok::kw___int64: 1022 case tok::kw___int128: 1023 case tok::kw_signed: 1024 case tok::kw_unsigned: 1025 case tok::kw_half: 1026 case tok::kw_float: 1027 case tok::kw_double: 1028 case tok::kw_void: 1029 case tok::kw_typename: 1030 case tok::kw_typeof: 1031 case tok::kw___vector: 1032 case tok::kw_image1d_t: 1033 case tok::kw_image1d_array_t: 1034 case tok::kw_image1d_buffer_t: 1035 case tok::kw_image2d_t: 1036 case tok::kw_image2d_array_t: 1037 case tok::kw_image3d_t: 1038 case tok::kw_sampler_t: 1039 case tok::kw_event_t: { 1040 if (!getLangOpts().CPlusPlus) { 1041 Diag(Tok, diag::err_expected_expression); 1042 return ExprError(); 1043 } 1044 1045 if (SavedKind == tok::kw_typename) { 1046 // postfix-expression: typename-specifier '(' expression-list[opt] ')' 1047 // typename-specifier braced-init-list 1048 if (TryAnnotateTypeOrScopeToken()) 1049 return ExprError(); 1050 1051 if (!Actions.isSimpleTypeSpecifier(Tok.getKind())) 1052 // We are trying to parse a simple-type-specifier but might not get such 1053 // a token after error recovery. 1054 return ExprError(); 1055 } 1056 1057 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')' 1058 // simple-type-specifier braced-init-list 1059 // 1060 DeclSpec DS(AttrFactory); 1061 1062 ParseCXXSimpleTypeSpecifier(DS); 1063 if (Tok.isNot(tok::l_paren) && 1064 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace))) 1065 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type) 1066 << DS.getSourceRange()); 1067 1068 if (Tok.is(tok::l_brace)) 1069 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1070 1071 Res = ParseCXXTypeConstructExpression(DS); 1072 break; 1073 } 1074 1075 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id 1076 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 1077 // (We can end up in this situation after tentative parsing.) 1078 if (TryAnnotateTypeOrScopeToken()) 1079 return ExprError(); 1080 if (!Tok.is(tok::annot_cxxscope)) 1081 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1082 NotCastExpr, isTypeCast); 1083 1084 Token Next = NextToken(); 1085 if (Next.is(tok::annot_template_id)) { 1086 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next); 1087 if (TemplateId->Kind == TNK_Type_template) { 1088 // We have a qualified template-id that we know refers to a 1089 // type, translate it into a type and continue parsing as a 1090 // cast expression. 1091 CXXScopeSpec SS; 1092 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1093 /*EnteringContext=*/false); 1094 AnnotateTemplateIdTokenAsType(); 1095 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1096 NotCastExpr, isTypeCast); 1097 } 1098 } 1099 1100 // Parse as an id-expression. 1101 Res = ParseCXXIdExpression(isAddressOfOperand); 1102 break; 1103 } 1104 1105 case tok::annot_template_id: { // [C++] template-id 1106 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 1107 if (TemplateId->Kind == TNK_Type_template) { 1108 // We have a template-id that we know refers to a type, 1109 // translate it into a type and continue parsing as a cast 1110 // expression. 1111 AnnotateTemplateIdTokenAsType(); 1112 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1113 NotCastExpr, isTypeCast); 1114 } 1115 1116 // Fall through to treat the template-id as an id-expression. 1117 } 1118 1119 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id 1120 Res = ParseCXXIdExpression(isAddressOfOperand); 1121 break; 1122 1123 case tok::coloncolon: { 1124 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken 1125 // annotates the token, tail recurse. 1126 if (TryAnnotateTypeOrScopeToken()) 1127 return ExprError(); 1128 if (!Tok.is(tok::coloncolon)) 1129 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 1130 1131 // ::new -> [C++] new-expression 1132 // ::delete -> [C++] delete-expression 1133 SourceLocation CCLoc = ConsumeToken(); 1134 if (Tok.is(tok::kw_new)) 1135 return ParseCXXNewExpression(true, CCLoc); 1136 if (Tok.is(tok::kw_delete)) 1137 return ParseCXXDeleteExpression(true, CCLoc); 1138 1139 // This is not a type name or scope specifier, it is an invalid expression. 1140 Diag(CCLoc, diag::err_expected_expression); 1141 return ExprError(); 1142 } 1143 1144 case tok::kw_new: // [C++] new-expression 1145 return ParseCXXNewExpression(false, Tok.getLocation()); 1146 1147 case tok::kw_delete: // [C++] delete-expression 1148 return ParseCXXDeleteExpression(false, Tok.getLocation()); 1149 1150 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')' 1151 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr); 1152 SourceLocation KeyLoc = ConsumeToken(); 1153 BalancedDelimiterTracker T(*this, tok::l_paren); 1154 1155 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept")) 1156 return ExprError(); 1157 // C++11 [expr.unary.noexcept]p1: 1158 // The noexcept operator determines whether the evaluation of its operand, 1159 // which is an unevaluated operand, can throw an exception. 1160 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1161 ExprResult Result = ParseExpression(); 1162 1163 T.consumeClose(); 1164 1165 if (!Result.isInvalid()) 1166 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(), 1167 Result.take(), T.getCloseLocation()); 1168 return Result; 1169 } 1170 1171 case tok::kw___is_abstract: // [GNU] unary-type-trait 1172 case tok::kw___is_class: 1173 case tok::kw___is_empty: 1174 case tok::kw___is_enum: 1175 case tok::kw___is_interface_class: 1176 case tok::kw___is_literal: 1177 case tok::kw___is_arithmetic: 1178 case tok::kw___is_integral: 1179 case tok::kw___is_floating_point: 1180 case tok::kw___is_complete_type: 1181 case tok::kw___is_void: 1182 case tok::kw___is_array: 1183 case tok::kw___is_function: 1184 case tok::kw___is_reference: 1185 case tok::kw___is_lvalue_reference: 1186 case tok::kw___is_rvalue_reference: 1187 case tok::kw___is_fundamental: 1188 case tok::kw___is_object: 1189 case tok::kw___is_scalar: 1190 case tok::kw___is_compound: 1191 case tok::kw___is_pointer: 1192 case tok::kw___is_member_object_pointer: 1193 case tok::kw___is_member_function_pointer: 1194 case tok::kw___is_member_pointer: 1195 case tok::kw___is_const: 1196 case tok::kw___is_volatile: 1197 case tok::kw___is_standard_layout: 1198 case tok::kw___is_signed: 1199 case tok::kw___is_unsigned: 1200 case tok::kw___is_literal_type: 1201 case tok::kw___is_pod: 1202 case tok::kw___is_polymorphic: 1203 case tok::kw___is_trivial: 1204 case tok::kw___is_trivially_copyable: 1205 case tok::kw___is_union: 1206 case tok::kw___is_final: 1207 case tok::kw___is_sealed: 1208 case tok::kw___has_trivial_constructor: 1209 case tok::kw___has_trivial_move_constructor: 1210 case tok::kw___has_trivial_copy: 1211 case tok::kw___has_trivial_assign: 1212 case tok::kw___has_trivial_move_assign: 1213 case tok::kw___has_trivial_destructor: 1214 case tok::kw___has_nothrow_assign: 1215 case tok::kw___has_nothrow_move_assign: 1216 case tok::kw___has_nothrow_copy: 1217 case tok::kw___has_nothrow_constructor: 1218 case tok::kw___has_virtual_destructor: 1219 return ParseUnaryTypeTrait(); 1220 1221 case tok::kw___builtin_types_compatible_p: 1222 case tok::kw___is_base_of: 1223 case tok::kw___is_same: 1224 case tok::kw___is_convertible: 1225 case tok::kw___is_convertible_to: 1226 case tok::kw___is_trivially_assignable: 1227 return ParseBinaryTypeTrait(); 1228 1229 case tok::kw___is_trivially_constructible: 1230 return ParseTypeTrait(); 1231 1232 case tok::kw___array_rank: 1233 case tok::kw___array_extent: 1234 return ParseArrayTypeTrait(); 1235 1236 case tok::kw___is_lvalue_expr: 1237 case tok::kw___is_rvalue_expr: 1238 return ParseExpressionTrait(); 1239 1240 case tok::at: { 1241 SourceLocation AtLoc = ConsumeToken(); 1242 return ParseObjCAtExpression(AtLoc); 1243 } 1244 case tok::caret: 1245 Res = ParseBlockLiteralExpression(); 1246 break; 1247 case tok::code_completion: { 1248 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 1249 cutOffParsing(); 1250 return ExprError(); 1251 } 1252 case tok::l_square: 1253 if (getLangOpts().CPlusPlus11) { 1254 if (getLangOpts().ObjC1) { 1255 // C++11 lambda expressions and Objective-C message sends both start with a 1256 // square bracket. There are three possibilities here: 1257 // we have a valid lambda expression, we have an invalid lambda 1258 // expression, or we have something that doesn't appear to be a lambda. 1259 // If we're in the last case, we fall back to ParseObjCMessageExpression. 1260 Res = TryParseLambdaExpression(); 1261 if (!Res.isInvalid() && !Res.get()) 1262 Res = ParseObjCMessageExpression(); 1263 break; 1264 } 1265 Res = ParseLambdaExpression(); 1266 break; 1267 } 1268 if (getLangOpts().ObjC1) { 1269 Res = ParseObjCMessageExpression(); 1270 break; 1271 } 1272 // FALL THROUGH. 1273 default: 1274 NotCastExpr = true; 1275 return ExprError(); 1276 } 1277 1278 // These can be followed by postfix-expr pieces. 1279 return ParsePostfixExpressionSuffix(Res); 1280} 1281 1282/// \brief Once the leading part of a postfix-expression is parsed, this 1283/// method parses any suffixes that apply. 1284/// 1285/// \verbatim 1286/// postfix-expression: [C99 6.5.2] 1287/// primary-expression 1288/// postfix-expression '[' expression ']' 1289/// postfix-expression '[' braced-init-list ']' 1290/// postfix-expression '(' argument-expression-list[opt] ')' 1291/// postfix-expression '.' identifier 1292/// postfix-expression '->' identifier 1293/// postfix-expression '++' 1294/// postfix-expression '--' 1295/// '(' type-name ')' '{' initializer-list '}' 1296/// '(' type-name ')' '{' initializer-list ',' '}' 1297/// 1298/// argument-expression-list: [C99 6.5.2] 1299/// argument-expression ...[opt] 1300/// argument-expression-list ',' assignment-expression ...[opt] 1301/// \endverbatim 1302ExprResult 1303Parser::ParsePostfixExpressionSuffix(ExprResult LHS) { 1304 // Now that the primary-expression piece of the postfix-expression has been 1305 // parsed, see if there are any postfix-expression pieces here. 1306 SourceLocation Loc; 1307 while (1) { 1308 switch (Tok.getKind()) { 1309 case tok::code_completion: 1310 if (InMessageExpression) 1311 return LHS; 1312 1313 Actions.CodeCompletePostfixExpression(getCurScope(), LHS); 1314 cutOffParsing(); 1315 return ExprError(); 1316 1317 case tok::identifier: 1318 // If we see identifier: after an expression, and we're not already in a 1319 // message send, then this is probably a message send with a missing 1320 // opening bracket '['. 1321 if (getLangOpts().ObjC1 && !InMessageExpression && 1322 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1323 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1324 ParsedType(), LHS.get()); 1325 break; 1326 } 1327 1328 // Fall through; this isn't a message send. 1329 1330 default: // Not a postfix-expression suffix. 1331 return LHS; 1332 case tok::l_square: { // postfix-expression: p-e '[' expression ']' 1333 // If we have a array postfix expression that starts on a new line and 1334 // Objective-C is enabled, it is highly likely that the user forgot a 1335 // semicolon after the base expression and that the array postfix-expr is 1336 // actually another message send. In this case, do some look-ahead to see 1337 // if the contents of the square brackets are obviously not a valid 1338 // expression and recover by pretending there is no suffix. 1339 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() && 1340 isSimpleObjCMessageExpression()) 1341 return LHS; 1342 1343 // Reject array indices starting with a lambda-expression. '[[' is 1344 // reserved for attributes. 1345 if (CheckProhibitedCXX11Attribute()) 1346 return ExprError(); 1347 1348 BalancedDelimiterTracker T(*this, tok::l_square); 1349 T.consumeOpen(); 1350 Loc = T.getOpenLocation(); 1351 ExprResult Idx; 1352 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 1353 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1354 Idx = ParseBraceInitializer(); 1355 } else 1356 Idx = ParseExpression(); 1357 1358 SourceLocation RLoc = Tok.getLocation(); 1359 1360 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) { 1361 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc, 1362 Idx.take(), RLoc); 1363 } else 1364 LHS = ExprError(); 1365 1366 // Match the ']'. 1367 T.consumeClose(); 1368 break; 1369 } 1370 1371 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')' 1372 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>' 1373 // '(' argument-expression-list[opt] ')' 1374 tok::TokenKind OpKind = Tok.getKind(); 1375 InMessageExpressionRAIIObject InMessage(*this, false); 1376 1377 Expr *ExecConfig = 0; 1378 1379 BalancedDelimiterTracker PT(*this, tok::l_paren); 1380 1381 if (OpKind == tok::lesslessless) { 1382 ExprVector ExecConfigExprs; 1383 CommaLocsTy ExecConfigCommaLocs; 1384 SourceLocation OpenLoc = ConsumeToken(); 1385 1386 if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) { 1387 LHS = ExprError(); 1388 } 1389 1390 SourceLocation CloseLoc = Tok.getLocation(); 1391 if (Tok.is(tok::greatergreatergreater)) { 1392 ConsumeToken(); 1393 } else if (LHS.isInvalid()) { 1394 SkipUntil(tok::greatergreatergreater, StopAtSemi); 1395 } else { 1396 // There was an error closing the brackets 1397 Diag(Tok, diag::err_expected_ggg); 1398 Diag(OpenLoc, diag::note_matching) << "<<<"; 1399 SkipUntil(tok::greatergreatergreater, StopAtSemi); 1400 LHS = ExprError(); 1401 } 1402 1403 if (!LHS.isInvalid()) { 1404 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, "")) 1405 LHS = ExprError(); 1406 else 1407 Loc = PrevTokLocation; 1408 } 1409 1410 if (!LHS.isInvalid()) { 1411 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(), 1412 OpenLoc, 1413 ExecConfigExprs, 1414 CloseLoc); 1415 if (ECResult.isInvalid()) 1416 LHS = ExprError(); 1417 else 1418 ExecConfig = ECResult.get(); 1419 } 1420 } else { 1421 PT.consumeOpen(); 1422 Loc = PT.getOpenLocation(); 1423 } 1424 1425 ExprVector ArgExprs; 1426 CommaLocsTy CommaLocs; 1427 1428 if (Tok.is(tok::code_completion)) { 1429 Actions.CodeCompleteCall(getCurScope(), LHS.get(), None); 1430 cutOffParsing(); 1431 return ExprError(); 1432 } 1433 1434 if (OpKind == tok::l_paren || !LHS.isInvalid()) { 1435 if (Tok.isNot(tok::r_paren)) { 1436 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall, 1437 LHS.get())) { 1438 LHS = ExprError(); 1439 } 1440 } 1441 } 1442 1443 // Match the ')'. 1444 if (LHS.isInvalid()) { 1445 SkipUntil(tok::r_paren, StopAtSemi); 1446 } else if (Tok.isNot(tok::r_paren)) { 1447 PT.consumeClose(); 1448 LHS = ExprError(); 1449 } else { 1450 assert((ArgExprs.size() == 0 || 1451 ArgExprs.size()-1 == CommaLocs.size())&& 1452 "Unexpected number of commas!"); 1453 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc, 1454 ArgExprs, Tok.getLocation(), 1455 ExecConfig); 1456 PT.consumeClose(); 1457 } 1458 1459 break; 1460 } 1461 case tok::arrow: 1462 case tok::period: { 1463 // postfix-expression: p-e '->' template[opt] id-expression 1464 // postfix-expression: p-e '.' template[opt] id-expression 1465 tok::TokenKind OpKind = Tok.getKind(); 1466 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token. 1467 1468 CXXScopeSpec SS; 1469 ParsedType ObjectType; 1470 bool MayBePseudoDestructor = false; 1471 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) { 1472 Expr *Base = LHS.take(); 1473 const Type* BaseType = Base->getType().getTypePtrOrNull(); 1474 if (BaseType && Tok.is(tok::l_paren) && 1475 (BaseType->isFunctionType() || 1476 BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) { 1477 Diag(OpLoc, diag::err_function_is_not_record) 1478 << (OpKind == tok::arrow) << Base->getSourceRange() 1479 << FixItHint::CreateRemoval(OpLoc); 1480 return ParsePostfixExpressionSuffix(Base); 1481 } 1482 1483 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base, 1484 OpLoc, OpKind, ObjectType, 1485 MayBePseudoDestructor); 1486 if (LHS.isInvalid()) 1487 break; 1488 1489 ParseOptionalCXXScopeSpecifier(SS, ObjectType, 1490 /*EnteringContext=*/false, 1491 &MayBePseudoDestructor); 1492 if (SS.isNotEmpty()) 1493 ObjectType = ParsedType(); 1494 } 1495 1496 if (Tok.is(tok::code_completion)) { 1497 // Code completion for a member access expression. 1498 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(), 1499 OpLoc, OpKind == tok::arrow); 1500 1501 cutOffParsing(); 1502 return ExprError(); 1503 } 1504 1505 if (MayBePseudoDestructor && !LHS.isInvalid()) { 1506 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS, 1507 ObjectType); 1508 break; 1509 } 1510 1511 // Either the action has told is that this cannot be a 1512 // pseudo-destructor expression (based on the type of base 1513 // expression), or we didn't see a '~' in the right place. We 1514 // can still parse a destructor name here, but in that case it 1515 // names a real destructor. 1516 // Allow explicit constructor calls in Microsoft mode. 1517 // FIXME: Add support for explicit call of template constructor. 1518 SourceLocation TemplateKWLoc; 1519 UnqualifiedId Name; 1520 if (getLangOpts().ObjC2 && OpKind == tok::period && Tok.is(tok::kw_class)) { 1521 // Objective-C++: 1522 // After a '.' in a member access expression, treat the keyword 1523 // 'class' as if it were an identifier. 1524 // 1525 // This hack allows property access to the 'class' method because it is 1526 // such a common method name. For other C++ keywords that are 1527 // Objective-C method names, one must use the message send syntax. 1528 IdentifierInfo *Id = Tok.getIdentifierInfo(); 1529 SourceLocation Loc = ConsumeToken(); 1530 Name.setIdentifier(Id, Loc); 1531 } else if (ParseUnqualifiedId(SS, 1532 /*EnteringContext=*/false, 1533 /*AllowDestructorName=*/true, 1534 /*AllowConstructorName=*/ 1535 getLangOpts().MicrosoftExt, 1536 ObjectType, TemplateKWLoc, Name)) 1537 LHS = ExprError(); 1538 1539 if (!LHS.isInvalid()) 1540 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc, 1541 OpKind, SS, TemplateKWLoc, Name, 1542 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0, 1543 Tok.is(tok::l_paren)); 1544 break; 1545 } 1546 case tok::plusplus: // postfix-expression: postfix-expression '++' 1547 case tok::minusminus: // postfix-expression: postfix-expression '--' 1548 if (!LHS.isInvalid()) { 1549 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(), 1550 Tok.getKind(), LHS.take()); 1551 } 1552 ConsumeToken(); 1553 break; 1554 } 1555 } 1556} 1557 1558/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/ 1559/// vec_step and we are at the start of an expression or a parenthesized 1560/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the 1561/// expression (isCastExpr == false) or the type (isCastExpr == true). 1562/// 1563/// \verbatim 1564/// unary-expression: [C99 6.5.3] 1565/// 'sizeof' unary-expression 1566/// 'sizeof' '(' type-name ')' 1567/// [GNU] '__alignof' unary-expression 1568/// [GNU] '__alignof' '(' type-name ')' 1569/// [C11] '_Alignof' '(' type-name ')' 1570/// [C++0x] 'alignof' '(' type-id ')' 1571/// 1572/// [GNU] typeof-specifier: 1573/// typeof ( expressions ) 1574/// typeof ( type-name ) 1575/// [GNU/C++] typeof unary-expression 1576/// 1577/// [OpenCL 1.1 6.11.12] vec_step built-in function: 1578/// vec_step ( expressions ) 1579/// vec_step ( type-name ) 1580/// \endverbatim 1581ExprResult 1582Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok, 1583 bool &isCastExpr, 1584 ParsedType &CastTy, 1585 SourceRange &CastRange) { 1586 1587 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) || 1588 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) || 1589 OpTok.is(tok::kw__Alignof) || OpTok.is(tok::kw_vec_step)) && 1590 "Not a typeof/sizeof/alignof/vec_step expression!"); 1591 1592 ExprResult Operand; 1593 1594 // If the operand doesn't start with an '(', it must be an expression. 1595 if (Tok.isNot(tok::l_paren)) { 1596 // If construct allows a form without parenthesis, user may forget to put 1597 // pathenthesis around type name. 1598 if (OpTok.is(tok::kw_sizeof) || OpTok.is(tok::kw___alignof) || 1599 OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) { 1600 bool isAmbiguousTypeId; 1601 if (isTypeIdInParens(isAmbiguousTypeId)) { 1602 DeclSpec DS(AttrFactory); 1603 ParseSpecifierQualifierList(DS); 1604 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1605 ParseDeclarator(DeclaratorInfo); 1606 1607 SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation()); 1608 SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation); 1609 Diag(LParenLoc, diag::err_expected_parentheses_around_typename) 1610 << OpTok.getName() 1611 << FixItHint::CreateInsertion(LParenLoc, "(") 1612 << FixItHint::CreateInsertion(RParenLoc, ")"); 1613 isCastExpr = true; 1614 return ExprEmpty(); 1615 } 1616 } 1617 1618 isCastExpr = false; 1619 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) { 1620 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo(); 1621 return ExprError(); 1622 } 1623 1624 Operand = ParseCastExpression(true/*isUnaryExpression*/); 1625 } else { 1626 // If it starts with a '(', we know that it is either a parenthesized 1627 // type-name, or it is a unary-expression that starts with a compound 1628 // literal, or starts with a primary-expression that is a parenthesized 1629 // expression. 1630 ParenParseOption ExprType = CastExpr; 1631 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 1632 1633 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/, 1634 false, CastTy, RParenLoc); 1635 CastRange = SourceRange(LParenLoc, RParenLoc); 1636 1637 // If ParseParenExpression parsed a '(typename)' sequence only, then this is 1638 // a type. 1639 if (ExprType == CastExpr) { 1640 isCastExpr = true; 1641 return ExprEmpty(); 1642 } 1643 1644 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) { 1645 // GNU typeof in C requires the expression to be parenthesized. Not so for 1646 // sizeof/alignof or in C++. Therefore, the parenthesized expression is 1647 // the start of a unary-expression, but doesn't include any postfix 1648 // pieces. Parse these now if present. 1649 if (!Operand.isInvalid()) 1650 Operand = ParsePostfixExpressionSuffix(Operand.get()); 1651 } 1652 } 1653 1654 // If we get here, the operand to the typeof/sizeof/alignof was an expresion. 1655 isCastExpr = false; 1656 return Operand; 1657} 1658 1659 1660/// \brief Parse a sizeof or alignof expression. 1661/// 1662/// \verbatim 1663/// unary-expression: [C99 6.5.3] 1664/// 'sizeof' unary-expression 1665/// 'sizeof' '(' type-name ')' 1666/// [C++11] 'sizeof' '...' '(' identifier ')' 1667/// [GNU] '__alignof' unary-expression 1668/// [GNU] '__alignof' '(' type-name ')' 1669/// [C11] '_Alignof' '(' type-name ')' 1670/// [C++11] 'alignof' '(' type-id ')' 1671/// \endverbatim 1672ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() { 1673 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) || 1674 Tok.is(tok::kw_alignof) || Tok.is(tok::kw__Alignof) || 1675 Tok.is(tok::kw_vec_step)) && 1676 "Not a sizeof/alignof/vec_step expression!"); 1677 Token OpTok = Tok; 1678 ConsumeToken(); 1679 1680 // [C++11] 'sizeof' '...' '(' identifier ')' 1681 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) { 1682 SourceLocation EllipsisLoc = ConsumeToken(); 1683 SourceLocation LParenLoc, RParenLoc; 1684 IdentifierInfo *Name = 0; 1685 SourceLocation NameLoc; 1686 if (Tok.is(tok::l_paren)) { 1687 BalancedDelimiterTracker T(*this, tok::l_paren); 1688 T.consumeOpen(); 1689 LParenLoc = T.getOpenLocation(); 1690 if (Tok.is(tok::identifier)) { 1691 Name = Tok.getIdentifierInfo(); 1692 NameLoc = ConsumeToken(); 1693 T.consumeClose(); 1694 RParenLoc = T.getCloseLocation(); 1695 if (RParenLoc.isInvalid()) 1696 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1697 } else { 1698 Diag(Tok, diag::err_expected_parameter_pack); 1699 SkipUntil(tok::r_paren, StopAtSemi); 1700 } 1701 } else if (Tok.is(tok::identifier)) { 1702 Name = Tok.getIdentifierInfo(); 1703 NameLoc = ConsumeToken(); 1704 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc); 1705 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1706 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack) 1707 << Name 1708 << FixItHint::CreateInsertion(LParenLoc, "(") 1709 << FixItHint::CreateInsertion(RParenLoc, ")"); 1710 } else { 1711 Diag(Tok, diag::err_sizeof_parameter_pack); 1712 } 1713 1714 if (!Name) 1715 return ExprError(); 1716 1717 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 1718 Sema::ReuseLambdaContextDecl); 1719 1720 return Actions.ActOnSizeofParameterPackExpr(getCurScope(), 1721 OpTok.getLocation(), 1722 *Name, NameLoc, 1723 RParenLoc); 1724 } 1725 1726 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) 1727 Diag(OpTok, diag::warn_cxx98_compat_alignof); 1728 1729 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 1730 Sema::ReuseLambdaContextDecl); 1731 1732 bool isCastExpr; 1733 ParsedType CastTy; 1734 SourceRange CastRange; 1735 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok, 1736 isCastExpr, 1737 CastTy, 1738 CastRange); 1739 1740 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf; 1741 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof) || 1742 OpTok.is(tok::kw__Alignof)) 1743 ExprKind = UETT_AlignOf; 1744 else if (OpTok.is(tok::kw_vec_step)) 1745 ExprKind = UETT_VecStep; 1746 1747 if (isCastExpr) 1748 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1749 ExprKind, 1750 /*isType=*/true, 1751 CastTy.getAsOpaquePtr(), 1752 CastRange); 1753 1754 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) 1755 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo(); 1756 1757 // If we get here, the operand to the sizeof/alignof was an expresion. 1758 if (!Operand.isInvalid()) 1759 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1760 ExprKind, 1761 /*isType=*/false, 1762 Operand.release(), 1763 CastRange); 1764 return Operand; 1765} 1766 1767/// ParseBuiltinPrimaryExpression 1768/// 1769/// \verbatim 1770/// primary-expression: [C99 6.5.1] 1771/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 1772/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 1773/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 1774/// assign-expr ')' 1775/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 1776/// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')' 1777/// 1778/// [GNU] offsetof-member-designator: 1779/// [GNU] identifier 1780/// [GNU] offsetof-member-designator '.' identifier 1781/// [GNU] offsetof-member-designator '[' expression ']' 1782/// \endverbatim 1783ExprResult Parser::ParseBuiltinPrimaryExpression() { 1784 ExprResult Res; 1785 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); 1786 1787 tok::TokenKind T = Tok.getKind(); 1788 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier. 1789 1790 // All of these start with an open paren. 1791 if (Tok.isNot(tok::l_paren)) 1792 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id) 1793 << BuiltinII); 1794 1795 BalancedDelimiterTracker PT(*this, tok::l_paren); 1796 PT.consumeOpen(); 1797 1798 // TODO: Build AST. 1799 1800 switch (T) { 1801 default: llvm_unreachable("Not a builtin primary expression!"); 1802 case tok::kw___builtin_va_arg: { 1803 ExprResult Expr(ParseAssignmentExpression()); 1804 1805 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1806 Expr = ExprError(); 1807 1808 TypeResult Ty = ParseTypeName(); 1809 1810 if (Tok.isNot(tok::r_paren)) { 1811 Diag(Tok, diag::err_expected_rparen); 1812 Expr = ExprError(); 1813 } 1814 1815 if (Expr.isInvalid() || Ty.isInvalid()) 1816 Res = ExprError(); 1817 else 1818 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen()); 1819 break; 1820 } 1821 case tok::kw___builtin_offsetof: { 1822 SourceLocation TypeLoc = Tok.getLocation(); 1823 TypeResult Ty = ParseTypeName(); 1824 if (Ty.isInvalid()) { 1825 SkipUntil(tok::r_paren, StopAtSemi); 1826 return ExprError(); 1827 } 1828 1829 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1830 return ExprError(); 1831 1832 // We must have at least one identifier here. 1833 if (Tok.isNot(tok::identifier)) { 1834 Diag(Tok, diag::err_expected_ident); 1835 SkipUntil(tok::r_paren, StopAtSemi); 1836 return ExprError(); 1837 } 1838 1839 // Keep track of the various subcomponents we see. 1840 SmallVector<Sema::OffsetOfComponent, 4> Comps; 1841 1842 Comps.push_back(Sema::OffsetOfComponent()); 1843 Comps.back().isBrackets = false; 1844 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1845 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken(); 1846 1847 // FIXME: This loop leaks the index expressions on error. 1848 while (1) { 1849 if (Tok.is(tok::period)) { 1850 // offsetof-member-designator: offsetof-member-designator '.' identifier 1851 Comps.push_back(Sema::OffsetOfComponent()); 1852 Comps.back().isBrackets = false; 1853 Comps.back().LocStart = ConsumeToken(); 1854 1855 if (Tok.isNot(tok::identifier)) { 1856 Diag(Tok, diag::err_expected_ident); 1857 SkipUntil(tok::r_paren, StopAtSemi); 1858 return ExprError(); 1859 } 1860 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1861 Comps.back().LocEnd = ConsumeToken(); 1862 1863 } else if (Tok.is(tok::l_square)) { 1864 if (CheckProhibitedCXX11Attribute()) 1865 return ExprError(); 1866 1867 // offsetof-member-designator: offsetof-member-design '[' expression ']' 1868 Comps.push_back(Sema::OffsetOfComponent()); 1869 Comps.back().isBrackets = true; 1870 BalancedDelimiterTracker ST(*this, tok::l_square); 1871 ST.consumeOpen(); 1872 Comps.back().LocStart = ST.getOpenLocation(); 1873 Res = ParseExpression(); 1874 if (Res.isInvalid()) { 1875 SkipUntil(tok::r_paren, StopAtSemi); 1876 return Res; 1877 } 1878 Comps.back().U.E = Res.release(); 1879 1880 ST.consumeClose(); 1881 Comps.back().LocEnd = ST.getCloseLocation(); 1882 } else { 1883 if (Tok.isNot(tok::r_paren)) { 1884 PT.consumeClose(); 1885 Res = ExprError(); 1886 } else if (Ty.isInvalid()) { 1887 Res = ExprError(); 1888 } else { 1889 PT.consumeClose(); 1890 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc, 1891 Ty.get(), &Comps[0], Comps.size(), 1892 PT.getCloseLocation()); 1893 } 1894 break; 1895 } 1896 } 1897 break; 1898 } 1899 case tok::kw___builtin_choose_expr: { 1900 ExprResult Cond(ParseAssignmentExpression()); 1901 if (Cond.isInvalid()) { 1902 SkipUntil(tok::r_paren, StopAtSemi); 1903 return Cond; 1904 } 1905 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1906 return ExprError(); 1907 1908 ExprResult Expr1(ParseAssignmentExpression()); 1909 if (Expr1.isInvalid()) { 1910 SkipUntil(tok::r_paren, StopAtSemi); 1911 return Expr1; 1912 } 1913 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1914 return ExprError(); 1915 1916 ExprResult Expr2(ParseAssignmentExpression()); 1917 if (Expr2.isInvalid()) { 1918 SkipUntil(tok::r_paren, StopAtSemi); 1919 return Expr2; 1920 } 1921 if (Tok.isNot(tok::r_paren)) { 1922 Diag(Tok, diag::err_expected_rparen); 1923 return ExprError(); 1924 } 1925 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(), 1926 Expr2.take(), ConsumeParen()); 1927 break; 1928 } 1929 case tok::kw___builtin_astype: { 1930 // The first argument is an expression to be converted, followed by a comma. 1931 ExprResult Expr(ParseAssignmentExpression()); 1932 if (Expr.isInvalid()) { 1933 SkipUntil(tok::r_paren, StopAtSemi); 1934 return ExprError(); 1935 } 1936 1937 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", 1938 tok::r_paren)) 1939 return ExprError(); 1940 1941 // Second argument is the type to bitcast to. 1942 TypeResult DestTy = ParseTypeName(); 1943 if (DestTy.isInvalid()) 1944 return ExprError(); 1945 1946 // Attempt to consume the r-paren. 1947 if (Tok.isNot(tok::r_paren)) { 1948 Diag(Tok, diag::err_expected_rparen); 1949 SkipUntil(tok::r_paren, StopAtSemi); 1950 return ExprError(); 1951 } 1952 1953 Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc, 1954 ConsumeParen()); 1955 break; 1956 } 1957 case tok::kw___builtin_convertvector: { 1958 // The first argument is an expression to be converted, followed by a comma. 1959 ExprResult Expr(ParseAssignmentExpression()); 1960 if (Expr.isInvalid()) { 1961 SkipUntil(tok::r_paren, StopAtSemi); 1962 return ExprError(); 1963 } 1964 1965 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", 1966 tok::r_paren)) 1967 return ExprError(); 1968 1969 // Second argument is the type to bitcast to. 1970 TypeResult DestTy = ParseTypeName(); 1971 if (DestTy.isInvalid()) 1972 return ExprError(); 1973 1974 // Attempt to consume the r-paren. 1975 if (Tok.isNot(tok::r_paren)) { 1976 Diag(Tok, diag::err_expected_rparen); 1977 SkipUntil(tok::r_paren, StopAtSemi); 1978 return ExprError(); 1979 } 1980 1981 Res = Actions.ActOnConvertVectorExpr(Expr.take(), DestTy.get(), StartLoc, 1982 ConsumeParen()); 1983 break; 1984 } 1985 } 1986 1987 if (Res.isInvalid()) 1988 return ExprError(); 1989 1990 // These can be followed by postfix-expr pieces because they are 1991 // primary-expressions. 1992 return ParsePostfixExpressionSuffix(Res.take()); 1993} 1994 1995/// ParseParenExpression - This parses the unit that starts with a '(' token, 1996/// based on what is allowed by ExprType. The actual thing parsed is returned 1997/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type, 1998/// not the parsed cast-expression. 1999/// 2000/// \verbatim 2001/// primary-expression: [C99 6.5.1] 2002/// '(' expression ')' 2003/// [GNU] '(' compound-statement ')' (if !ParenExprOnly) 2004/// postfix-expression: [C99 6.5.2] 2005/// '(' type-name ')' '{' initializer-list '}' 2006/// '(' type-name ')' '{' initializer-list ',' '}' 2007/// cast-expression: [C99 6.5.4] 2008/// '(' type-name ')' cast-expression 2009/// [ARC] bridged-cast-expression 2010/// 2011/// [ARC] bridged-cast-expression: 2012/// (__bridge type-name) cast-expression 2013/// (__bridge_transfer type-name) cast-expression 2014/// (__bridge_retained type-name) cast-expression 2015/// \endverbatim 2016ExprResult 2017Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr, 2018 bool isTypeCast, ParsedType &CastTy, 2019 SourceLocation &RParenLoc) { 2020 assert(Tok.is(tok::l_paren) && "Not a paren expr!"); 2021 BalancedDelimiterTracker T(*this, tok::l_paren); 2022 if (T.consumeOpen()) 2023 return ExprError(); 2024 SourceLocation OpenLoc = T.getOpenLocation(); 2025 2026 ExprResult Result(true); 2027 bool isAmbiguousTypeId; 2028 CastTy = ParsedType(); 2029 2030 if (Tok.is(tok::code_completion)) { 2031 Actions.CodeCompleteOrdinaryName(getCurScope(), 2032 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression 2033 : Sema::PCC_Expression); 2034 cutOffParsing(); 2035 return ExprError(); 2036 } 2037 2038 // Diagnose use of bridge casts in non-arc mode. 2039 bool BridgeCast = (getLangOpts().ObjC2 && 2040 (Tok.is(tok::kw___bridge) || 2041 Tok.is(tok::kw___bridge_transfer) || 2042 Tok.is(tok::kw___bridge_retained) || 2043 Tok.is(tok::kw___bridge_retain))); 2044 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) { 2045 if (Tok.isNot(tok::kw___bridge)) { 2046 StringRef BridgeCastName = Tok.getName(); 2047 SourceLocation BridgeKeywordLoc = ConsumeToken(); 2048 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 2049 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc) 2050 << BridgeCastName 2051 << FixItHint::CreateReplacement(BridgeKeywordLoc, ""); 2052 } 2053 else 2054 ConsumeToken(); // consume __bridge 2055 BridgeCast = false; 2056 } 2057 2058 // None of these cases should fall through with an invalid Result 2059 // unless they've already reported an error. 2060 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) { 2061 Diag(Tok, diag::ext_gnu_statement_expr); 2062 Actions.ActOnStartStmtExpr(); 2063 2064 StmtResult Stmt(ParseCompoundStatement(true)); 2065 ExprType = CompoundStmt; 2066 2067 // If the substmt parsed correctly, build the AST node. 2068 if (!Stmt.isInvalid()) { 2069 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation()); 2070 } else { 2071 Actions.ActOnStmtExprError(); 2072 } 2073 } else if (ExprType >= CompoundLiteral && BridgeCast) { 2074 tok::TokenKind tokenKind = Tok.getKind(); 2075 SourceLocation BridgeKeywordLoc = ConsumeToken(); 2076 2077 // Parse an Objective-C ARC ownership cast expression. 2078 ObjCBridgeCastKind Kind; 2079 if (tokenKind == tok::kw___bridge) 2080 Kind = OBC_Bridge; 2081 else if (tokenKind == tok::kw___bridge_transfer) 2082 Kind = OBC_BridgeTransfer; 2083 else if (tokenKind == tok::kw___bridge_retained) 2084 Kind = OBC_BridgeRetained; 2085 else { 2086 // As a hopefully temporary workaround, allow __bridge_retain as 2087 // a synonym for __bridge_retained, but only in system headers. 2088 assert(tokenKind == tok::kw___bridge_retain); 2089 Kind = OBC_BridgeRetained; 2090 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 2091 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain) 2092 << FixItHint::CreateReplacement(BridgeKeywordLoc, 2093 "__bridge_retained"); 2094 } 2095 2096 TypeResult Ty = ParseTypeName(); 2097 T.consumeClose(); 2098 RParenLoc = T.getCloseLocation(); 2099 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false); 2100 2101 if (Ty.isInvalid() || SubExpr.isInvalid()) 2102 return ExprError(); 2103 2104 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind, 2105 BridgeKeywordLoc, Ty.get(), 2106 RParenLoc, SubExpr.get()); 2107 } else if (ExprType >= CompoundLiteral && 2108 isTypeIdInParens(isAmbiguousTypeId)) { 2109 2110 // Otherwise, this is a compound literal expression or cast expression. 2111 2112 // In C++, if the type-id is ambiguous we disambiguate based on context. 2113 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof 2114 // in which case we should treat it as type-id. 2115 // if stopIfCastExpr is false, we need to determine the context past the 2116 // parens, so we defer to ParseCXXAmbiguousParenExpression for that. 2117 if (isAmbiguousTypeId && !stopIfCastExpr) { 2118 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T); 2119 RParenLoc = T.getCloseLocation(); 2120 return res; 2121 } 2122 2123 // Parse the type declarator. 2124 DeclSpec DS(AttrFactory); 2125 ParseSpecifierQualifierList(DS); 2126 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 2127 ParseDeclarator(DeclaratorInfo); 2128 2129 // If our type is followed by an identifier and either ':' or ']', then 2130 // this is probably an Objective-C message send where the leading '[' is 2131 // missing. Recover as if that were the case. 2132 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) && 2133 !InMessageExpression && getLangOpts().ObjC1 && 2134 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 2135 TypeResult Ty; 2136 { 2137 InMessageExpressionRAIIObject InMessage(*this, false); 2138 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2139 } 2140 Result = ParseObjCMessageExpressionBody(SourceLocation(), 2141 SourceLocation(), 2142 Ty.get(), 0); 2143 } else { 2144 // Match the ')'. 2145 T.consumeClose(); 2146 RParenLoc = T.getCloseLocation(); 2147 if (Tok.is(tok::l_brace)) { 2148 ExprType = CompoundLiteral; 2149 TypeResult Ty; 2150 { 2151 InMessageExpressionRAIIObject InMessage(*this, false); 2152 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2153 } 2154 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc); 2155 } 2156 2157 if (ExprType == CastExpr) { 2158 // We parsed '(' type-name ')' and the thing after it wasn't a '{'. 2159 2160 if (DeclaratorInfo.isInvalidType()) 2161 return ExprError(); 2162 2163 // Note that this doesn't parse the subsequent cast-expression, it just 2164 // returns the parsed type to the callee. 2165 if (stopIfCastExpr) { 2166 TypeResult Ty; 2167 { 2168 InMessageExpressionRAIIObject InMessage(*this, false); 2169 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2170 } 2171 CastTy = Ty.get(); 2172 return ExprResult(); 2173 } 2174 2175 // Reject the cast of super idiom in ObjC. 2176 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 && 2177 Tok.getIdentifierInfo() == Ident_super && 2178 getCurScope()->isInObjcMethodScope() && 2179 GetLookAheadToken(1).isNot(tok::period)) { 2180 Diag(Tok.getLocation(), diag::err_illegal_super_cast) 2181 << SourceRange(OpenLoc, RParenLoc); 2182 return ExprError(); 2183 } 2184 2185 // Parse the cast-expression that follows it next. 2186 // TODO: For cast expression with CastTy. 2187 Result = ParseCastExpression(/*isUnaryExpression=*/false, 2188 /*isAddressOfOperand=*/false, 2189 /*isTypeCast=*/IsTypeCast); 2190 if (!Result.isInvalid()) { 2191 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc, 2192 DeclaratorInfo, CastTy, 2193 RParenLoc, Result.take()); 2194 } 2195 return Result; 2196 } 2197 2198 Diag(Tok, diag::err_expected_lbrace_in_compound_literal); 2199 return ExprError(); 2200 } 2201 } else if (isTypeCast) { 2202 // Parse the expression-list. 2203 InMessageExpressionRAIIObject InMessage(*this, false); 2204 2205 ExprVector ArgExprs; 2206 CommaLocsTy CommaLocs; 2207 2208 if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) { 2209 ExprType = SimpleExpr; 2210 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(), 2211 ArgExprs); 2212 } 2213 } else { 2214 InMessageExpressionRAIIObject InMessage(*this, false); 2215 2216 Result = ParseExpression(MaybeTypeCast); 2217 ExprType = SimpleExpr; 2218 2219 // Don't build a paren expression unless we actually match a ')'. 2220 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2221 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take()); 2222 } 2223 2224 // Match the ')'. 2225 if (Result.isInvalid()) { 2226 SkipUntil(tok::r_paren, StopAtSemi); 2227 return ExprError(); 2228 } 2229 2230 T.consumeClose(); 2231 RParenLoc = T.getCloseLocation(); 2232 return Result; 2233} 2234 2235/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name 2236/// and we are at the left brace. 2237/// 2238/// \verbatim 2239/// postfix-expression: [C99 6.5.2] 2240/// '(' type-name ')' '{' initializer-list '}' 2241/// '(' type-name ')' '{' initializer-list ',' '}' 2242/// \endverbatim 2243ExprResult 2244Parser::ParseCompoundLiteralExpression(ParsedType Ty, 2245 SourceLocation LParenLoc, 2246 SourceLocation RParenLoc) { 2247 assert(Tok.is(tok::l_brace) && "Not a compound literal!"); 2248 if (!getLangOpts().C99) // Compound literals don't exist in C90. 2249 Diag(LParenLoc, diag::ext_c99_compound_literal); 2250 ExprResult Result = ParseInitializer(); 2251 if (!Result.isInvalid() && Ty) 2252 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take()); 2253 return Result; 2254} 2255 2256/// ParseStringLiteralExpression - This handles the various token types that 2257/// form string literals, and also handles string concatenation [C99 5.1.1.2, 2258/// translation phase #6]. 2259/// 2260/// \verbatim 2261/// primary-expression: [C99 6.5.1] 2262/// string-literal 2263/// \verbatim 2264ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) { 2265 assert(isTokenStringLiteral() && "Not a string literal!"); 2266 2267 // String concat. Note that keywords like __func__ and __FUNCTION__ are not 2268 // considered to be strings for concatenation purposes. 2269 SmallVector<Token, 4> StringToks; 2270 2271 do { 2272 StringToks.push_back(Tok); 2273 ConsumeStringToken(); 2274 } while (isTokenStringLiteral()); 2275 2276 // Pass the set of string tokens, ready for concatenation, to the actions. 2277 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size(), 2278 AllowUserDefinedLiteral ? getCurScope() : 0); 2279} 2280 2281/// ParseGenericSelectionExpression - Parse a C11 generic-selection 2282/// [C11 6.5.1.1]. 2283/// 2284/// \verbatim 2285/// generic-selection: 2286/// _Generic ( assignment-expression , generic-assoc-list ) 2287/// generic-assoc-list: 2288/// generic-association 2289/// generic-assoc-list , generic-association 2290/// generic-association: 2291/// type-name : assignment-expression 2292/// default : assignment-expression 2293/// \endverbatim 2294ExprResult Parser::ParseGenericSelectionExpression() { 2295 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected"); 2296 SourceLocation KeyLoc = ConsumeToken(); 2297 2298 if (!getLangOpts().C11) 2299 Diag(KeyLoc, diag::ext_c11_generic_selection); 2300 2301 BalancedDelimiterTracker T(*this, tok::l_paren); 2302 if (T.expectAndConsume(diag::err_expected_lparen)) 2303 return ExprError(); 2304 2305 ExprResult ControllingExpr; 2306 { 2307 // C11 6.5.1.1p3 "The controlling expression of a generic selection is 2308 // not evaluated." 2309 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2310 ControllingExpr = ParseAssignmentExpression(); 2311 if (ControllingExpr.isInvalid()) { 2312 SkipUntil(tok::r_paren, StopAtSemi); 2313 return ExprError(); 2314 } 2315 } 2316 2317 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) { 2318 SkipUntil(tok::r_paren, StopAtSemi); 2319 return ExprError(); 2320 } 2321 2322 SourceLocation DefaultLoc; 2323 TypeVector Types; 2324 ExprVector Exprs; 2325 while (1) { 2326 ParsedType Ty; 2327 if (Tok.is(tok::kw_default)) { 2328 // C11 6.5.1.1p2 "A generic selection shall have no more than one default 2329 // generic association." 2330 if (!DefaultLoc.isInvalid()) { 2331 Diag(Tok, diag::err_duplicate_default_assoc); 2332 Diag(DefaultLoc, diag::note_previous_default_assoc); 2333 SkipUntil(tok::r_paren, StopAtSemi); 2334 return ExprError(); 2335 } 2336 DefaultLoc = ConsumeToken(); 2337 Ty = ParsedType(); 2338 } else { 2339 ColonProtectionRAIIObject X(*this); 2340 TypeResult TR = ParseTypeName(); 2341 if (TR.isInvalid()) { 2342 SkipUntil(tok::r_paren, StopAtSemi); 2343 return ExprError(); 2344 } 2345 Ty = TR.release(); 2346 } 2347 Types.push_back(Ty); 2348 2349 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) { 2350 SkipUntil(tok::r_paren, StopAtSemi); 2351 return ExprError(); 2352 } 2353 2354 // FIXME: These expressions should be parsed in a potentially potentially 2355 // evaluated context. 2356 ExprResult ER(ParseAssignmentExpression()); 2357 if (ER.isInvalid()) { 2358 SkipUntil(tok::r_paren, StopAtSemi); 2359 return ExprError(); 2360 } 2361 Exprs.push_back(ER.release()); 2362 2363 if (Tok.isNot(tok::comma)) 2364 break; 2365 ConsumeToken(); 2366 } 2367 2368 T.consumeClose(); 2369 if (T.getCloseLocation().isInvalid()) 2370 return ExprError(); 2371 2372 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc, 2373 T.getCloseLocation(), 2374 ControllingExpr.release(), 2375 Types, Exprs); 2376} 2377 2378/// ParseExpressionList - Used for C/C++ (argument-)expression-list. 2379/// 2380/// \verbatim 2381/// argument-expression-list: 2382/// assignment-expression 2383/// argument-expression-list , assignment-expression 2384/// 2385/// [C++] expression-list: 2386/// [C++] assignment-expression 2387/// [C++] expression-list , assignment-expression 2388/// 2389/// [C++0x] expression-list: 2390/// [C++0x] initializer-list 2391/// 2392/// [C++0x] initializer-list 2393/// [C++0x] initializer-clause ...[opt] 2394/// [C++0x] initializer-list , initializer-clause ...[opt] 2395/// 2396/// [C++0x] initializer-clause: 2397/// [C++0x] assignment-expression 2398/// [C++0x] braced-init-list 2399/// \endverbatim 2400bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs, 2401 SmallVectorImpl<SourceLocation> &CommaLocs, 2402 void (Sema::*Completer)(Scope *S, 2403 Expr *Data, 2404 ArrayRef<Expr *> Args), 2405 Expr *Data) { 2406 while (1) { 2407 if (Tok.is(tok::code_completion)) { 2408 if (Completer) 2409 (Actions.*Completer)(getCurScope(), Data, Exprs); 2410 else 2411 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 2412 cutOffParsing(); 2413 return true; 2414 } 2415 2416 ExprResult Expr; 2417 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 2418 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2419 Expr = ParseBraceInitializer(); 2420 } else 2421 Expr = ParseAssignmentExpression(); 2422 2423 if (Tok.is(tok::ellipsis)) 2424 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken()); 2425 if (Expr.isInvalid()) 2426 return true; 2427 2428 Exprs.push_back(Expr.release()); 2429 2430 if (Tok.isNot(tok::comma)) 2431 return false; 2432 // Move to the next argument, remember where the comma was. 2433 CommaLocs.push_back(ConsumeToken()); 2434 } 2435} 2436 2437/// ParseSimpleExpressionList - A simple comma-separated list of expressions, 2438/// used for misc language extensions. 2439/// 2440/// \verbatim 2441/// simple-expression-list: 2442/// assignment-expression 2443/// simple-expression-list , assignment-expression 2444/// \endverbatim 2445bool 2446Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs, 2447 SmallVectorImpl<SourceLocation> &CommaLocs) { 2448 while (1) { 2449 ExprResult Expr = ParseAssignmentExpression(); 2450 if (Expr.isInvalid()) 2451 return true; 2452 2453 Exprs.push_back(Expr.release()); 2454 2455 if (Tok.isNot(tok::comma)) 2456 return false; 2457 2458 // Move to the next argument, remember where the comma was. 2459 CommaLocs.push_back(ConsumeToken()); 2460 } 2461} 2462 2463/// ParseBlockId - Parse a block-id, which roughly looks like int (int x). 2464/// 2465/// \verbatim 2466/// [clang] block-id: 2467/// [clang] specifier-qualifier-list block-declarator 2468/// \endverbatim 2469void Parser::ParseBlockId(SourceLocation CaretLoc) { 2470 if (Tok.is(tok::code_completion)) { 2471 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type); 2472 return cutOffParsing(); 2473 } 2474 2475 // Parse the specifier-qualifier-list piece. 2476 DeclSpec DS(AttrFactory); 2477 ParseSpecifierQualifierList(DS); 2478 2479 // Parse the block-declarator. 2480 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext); 2481 ParseDeclarator(DeclaratorInfo); 2482 2483 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes. 2484 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation()); 2485 2486 MaybeParseGNUAttributes(DeclaratorInfo); 2487 2488 // Inform sema that we are starting a block. 2489 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope()); 2490} 2491 2492/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks 2493/// like ^(int x){ return x+1; } 2494/// 2495/// \verbatim 2496/// block-literal: 2497/// [clang] '^' block-args[opt] compound-statement 2498/// [clang] '^' block-id compound-statement 2499/// [clang] block-args: 2500/// [clang] '(' parameter-list ')' 2501/// \endverbatim 2502ExprResult Parser::ParseBlockLiteralExpression() { 2503 assert(Tok.is(tok::caret) && "block literal starts with ^"); 2504 SourceLocation CaretLoc = ConsumeToken(); 2505 2506 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc, 2507 "block literal parsing"); 2508 2509 // Enter a scope to hold everything within the block. This includes the 2510 // argument decls, decls within the compound expression, etc. This also 2511 // allows determining whether a variable reference inside the block is 2512 // within or outside of the block. 2513 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope | 2514 Scope::DeclScope); 2515 2516 // Inform sema that we are starting a block. 2517 Actions.ActOnBlockStart(CaretLoc, getCurScope()); 2518 2519 // Parse the return type if present. 2520 DeclSpec DS(AttrFactory); 2521 Declarator ParamInfo(DS, Declarator::BlockLiteralContext); 2522 // FIXME: Since the return type isn't actually parsed, it can't be used to 2523 // fill ParamInfo with an initial valid range, so do it manually. 2524 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation())); 2525 2526 // If this block has arguments, parse them. There is no ambiguity here with 2527 // the expression case, because the expression case requires a parameter list. 2528 if (Tok.is(tok::l_paren)) { 2529 ParseParenDeclarator(ParamInfo); 2530 // Parse the pieces after the identifier as if we had "int(...)". 2531 // SetIdentifier sets the source range end, but in this case we're past 2532 // that location. 2533 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd(); 2534 ParamInfo.SetIdentifier(0, CaretLoc); 2535 ParamInfo.SetRangeEnd(Tmp); 2536 if (ParamInfo.isInvalidType()) { 2537 // If there was an error parsing the arguments, they may have 2538 // tried to use ^(x+y) which requires an argument list. Just 2539 // skip the whole block literal. 2540 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2541 return ExprError(); 2542 } 2543 2544 MaybeParseGNUAttributes(ParamInfo); 2545 2546 // Inform sema that we are starting a block. 2547 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope()); 2548 } else if (!Tok.is(tok::l_brace)) { 2549 ParseBlockId(CaretLoc); 2550 } else { 2551 // Otherwise, pretend we saw (void). 2552 ParsedAttributes attrs(AttrFactory); 2553 SourceLocation NoLoc; 2554 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true, 2555 /*IsAmbiguous=*/false, 2556 /*RParenLoc=*/NoLoc, 2557 /*ArgInfo=*/0, 2558 /*NumArgs=*/0, 2559 /*EllipsisLoc=*/NoLoc, 2560 /*RParenLoc=*/NoLoc, 2561 /*TypeQuals=*/0, 2562 /*RefQualifierIsLvalueRef=*/true, 2563 /*RefQualifierLoc=*/NoLoc, 2564 /*ConstQualifierLoc=*/NoLoc, 2565 /*VolatileQualifierLoc=*/NoLoc, 2566 /*MutableLoc=*/NoLoc, 2567 EST_None, 2568 /*ESpecLoc=*/NoLoc, 2569 /*Exceptions=*/0, 2570 /*ExceptionRanges=*/0, 2571 /*NumExceptions=*/0, 2572 /*NoexceptExpr=*/0, 2573 CaretLoc, CaretLoc, 2574 ParamInfo), 2575 attrs, CaretLoc); 2576 2577 MaybeParseGNUAttributes(ParamInfo); 2578 2579 // Inform sema that we are starting a block. 2580 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope()); 2581 } 2582 2583 2584 ExprResult Result(true); 2585 if (!Tok.is(tok::l_brace)) { 2586 // Saw something like: ^expr 2587 Diag(Tok, diag::err_expected_expression); 2588 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2589 return ExprError(); 2590 } 2591 2592 StmtResult Stmt(ParseCompoundStatementBody()); 2593 BlockScope.Exit(); 2594 if (!Stmt.isInvalid()) 2595 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope()); 2596 else 2597 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2598 return Result; 2599} 2600 2601/// ParseObjCBoolLiteral - This handles the objective-c Boolean literals. 2602/// 2603/// '__objc_yes' 2604/// '__objc_no' 2605ExprResult Parser::ParseObjCBoolLiteral() { 2606 tok::TokenKind Kind = Tok.getKind(); 2607 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind); 2608} 2609