AsmParser.cpp revision 274373
1//===- AsmParser.cpp - Parser for Assembly Files --------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This class implements the parser for assembly files. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/ADT/APFloat.h" 15#include "llvm/ADT/SmallString.h" 16#include "llvm/ADT/STLExtras.h" 17#include "llvm/ADT/StringMap.h" 18#include "llvm/ADT/Twine.h" 19#include "llvm/MC/MCAsmInfo.h" 20#include "llvm/MC/MCContext.h" 21#include "llvm/MC/MCDwarf.h" 22#include "llvm/MC/MCExpr.h" 23#include "llvm/MC/MCInstPrinter.h" 24#include "llvm/MC/MCInstrInfo.h" 25#include "llvm/MC/MCParser/AsmCond.h" 26#include "llvm/MC/MCParser/AsmLexer.h" 27#include "llvm/MC/MCParser/MCAsmParser.h" 28#include "llvm/MC/MCParser/MCParsedAsmOperand.h" 29#include "llvm/MC/MCRegisterInfo.h" 30#include "llvm/MC/MCSectionMachO.h" 31#include "llvm/MC/MCStreamer.h" 32#include "llvm/MC/MCSymbol.h" 33#include "llvm/MC/MCTargetAsmParser.h" 34#include "llvm/Support/CommandLine.h" 35#include "llvm/Support/ErrorHandling.h" 36#include "llvm/Support/MathExtras.h" 37#include "llvm/Support/MemoryBuffer.h" 38#include "llvm/Support/SourceMgr.h" 39#include "llvm/Support/raw_ostream.h" 40#include <cctype> 41#include <set> 42#include <string> 43#include <vector> 44using namespace llvm; 45 46static cl::opt<bool> 47FatalAssemblerWarnings("fatal-assembler-warnings", 48 cl::desc("Consider warnings as error")); 49 50MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {} 51 52namespace { 53 54/// \brief Helper types for tracking macro definitions. 55typedef std::vector<AsmToken> MCAsmMacroArgument; 56typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments; 57typedef std::pair<StringRef, MCAsmMacroArgument> MCAsmMacroParameter; 58typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters; 59 60struct MCAsmMacro { 61 StringRef Name; 62 StringRef Body; 63 MCAsmMacroParameters Parameters; 64 65public: 66 MCAsmMacro(StringRef N, StringRef B, const MCAsmMacroParameters &P) : 67 Name(N), Body(B), Parameters(P) {} 68 69 MCAsmMacro(const MCAsmMacro& Other) 70 : Name(Other.Name), Body(Other.Body), Parameters(Other.Parameters) {} 71}; 72 73/// \brief Helper class for storing information about an active macro 74/// instantiation. 75struct MacroInstantiation { 76 /// The macro being instantiated. 77 const MCAsmMacro *TheMacro; 78 79 /// The macro instantiation with substitutions. 80 MemoryBuffer *Instantiation; 81 82 /// The location of the instantiation. 83 SMLoc InstantiationLoc; 84 85 /// The buffer where parsing should resume upon instantiation completion. 86 int ExitBuffer; 87 88 /// The location where parsing should resume upon instantiation completion. 89 SMLoc ExitLoc; 90 91public: 92 MacroInstantiation(const MCAsmMacro *M, SMLoc IL, int EB, SMLoc EL, 93 MemoryBuffer *I); 94}; 95 96struct ParseStatementInfo { 97 /// \brief The parsed operands from the last parsed statement. 98 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands; 99 100 /// \brief The opcode from the last parsed instruction. 101 unsigned Opcode; 102 103 /// \brief Was there an error parsing the inline assembly? 104 bool ParseError; 105 106 SmallVectorImpl<AsmRewrite> *AsmRewrites; 107 108 ParseStatementInfo() : Opcode(~0U), ParseError(false), AsmRewrites(0) {} 109 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites) 110 : Opcode(~0), ParseError(false), AsmRewrites(rewrites) {} 111 112 ~ParseStatementInfo() { 113 // Free any parsed operands. 114 for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i) 115 delete ParsedOperands[i]; 116 ParsedOperands.clear(); 117 } 118}; 119 120/// \brief The concrete assembly parser instance. 121class AsmParser : public MCAsmParser { 122 AsmParser(const AsmParser &) LLVM_DELETED_FUNCTION; 123 void operator=(const AsmParser &) LLVM_DELETED_FUNCTION; 124private: 125 AsmLexer Lexer; 126 MCContext &Ctx; 127 MCStreamer &Out; 128 const MCAsmInfo &MAI; 129 SourceMgr &SrcMgr; 130 SourceMgr::DiagHandlerTy SavedDiagHandler; 131 void *SavedDiagContext; 132 MCAsmParserExtension *PlatformParser; 133 134 /// This is the current buffer index we're lexing from as managed by the 135 /// SourceMgr object. 136 int CurBuffer; 137 138 AsmCond TheCondState; 139 std::vector<AsmCond> TheCondStack; 140 141 /// \brief maps directive names to handler methods in parser 142 /// extensions. Extensions register themselves in this map by calling 143 /// addDirectiveHandler. 144 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap; 145 146 /// \brief Map of currently defined macros. 147 StringMap<MCAsmMacro*> MacroMap; 148 149 /// \brief Stack of active macro instantiations. 150 std::vector<MacroInstantiation*> ActiveMacros; 151 152 /// \brief List of bodies of anonymous macros. 153 std::deque<MCAsmMacro> MacroLikeBodies; 154 155 /// Boolean tracking whether macro substitution is enabled. 156 unsigned MacrosEnabledFlag : 1; 157 158 /// Flag tracking whether any errors have been encountered. 159 unsigned HadError : 1; 160 161 /// The values from the last parsed cpp hash file line comment if any. 162 StringRef CppHashFilename; 163 int64_t CppHashLineNumber; 164 SMLoc CppHashLoc; 165 int CppHashBuf; 166 /// When generating dwarf for assembly source files we need to calculate the 167 /// logical line number based on the last parsed cpp hash file line comment 168 /// and current line. Since this is slow and messes up the SourceMgr's 169 /// cache we save the last info we queried with SrcMgr.FindLineNumber(). 170 SMLoc LastQueryIDLoc; 171 int LastQueryBuffer; 172 unsigned LastQueryLine; 173 174 /// AssemblerDialect. ~OU means unset value and use value provided by MAI. 175 unsigned AssemblerDialect; 176 177 /// \brief is Darwin compatibility enabled? 178 bool IsDarwin; 179 180 /// \brief Are we parsing ms-style inline assembly? 181 bool ParsingInlineAsm; 182 183public: 184 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 185 const MCAsmInfo &MAI); 186 virtual ~AsmParser(); 187 188 virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false); 189 190 virtual void addDirectiveHandler(StringRef Directive, 191 ExtensionDirectiveHandler Handler) { 192 ExtensionDirectiveMap[Directive] = Handler; 193 } 194 195public: 196 /// @name MCAsmParser Interface 197 /// { 198 199 virtual SourceMgr &getSourceManager() { return SrcMgr; } 200 virtual MCAsmLexer &getLexer() { return Lexer; } 201 virtual MCContext &getContext() { return Ctx; } 202 virtual MCStreamer &getStreamer() { return Out; } 203 virtual unsigned getAssemblerDialect() { 204 if (AssemblerDialect == ~0U) 205 return MAI.getAssemblerDialect(); 206 else 207 return AssemblerDialect; 208 } 209 virtual void setAssemblerDialect(unsigned i) { 210 AssemblerDialect = i; 211 } 212 213 virtual bool Warning(SMLoc L, const Twine &Msg, 214 ArrayRef<SMRange> Ranges = None); 215 virtual bool Error(SMLoc L, const Twine &Msg, 216 ArrayRef<SMRange> Ranges = None); 217 218 virtual const AsmToken &Lex(); 219 220 void setParsingInlineAsm(bool V) { ParsingInlineAsm = V; } 221 bool isParsingInlineAsm() { return ParsingInlineAsm; } 222 223 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString, 224 unsigned &NumOutputs, unsigned &NumInputs, 225 SmallVectorImpl<std::pair<void *,bool> > &OpDecls, 226 SmallVectorImpl<std::string> &Constraints, 227 SmallVectorImpl<std::string> &Clobbers, 228 const MCInstrInfo *MII, 229 const MCInstPrinter *IP, 230 MCAsmParserSemaCallback &SI); 231 232 bool parseExpression(const MCExpr *&Res); 233 virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc); 234 virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc); 235 virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc); 236 virtual bool parseAbsoluteExpression(int64_t &Res); 237 238 /// \brief Parse an identifier or string (as a quoted identifier) 239 /// and set \p Res to the identifier contents. 240 virtual bool parseIdentifier(StringRef &Res); 241 virtual void eatToEndOfStatement(); 242 243 virtual void checkForValidSection(); 244 /// } 245 246private: 247 248 bool parseStatement(ParseStatementInfo &Info); 249 void eatToEndOfLine(); 250 bool parseCppHashLineFilenameComment(const SMLoc &L); 251 252 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body, 253 MCAsmMacroParameters Parameters); 254 bool expandMacro(raw_svector_ostream &OS, StringRef Body, 255 const MCAsmMacroParameters &Parameters, 256 const MCAsmMacroArguments &A, 257 const SMLoc &L); 258 259 /// \brief Are macros enabled in the parser? 260 bool areMacrosEnabled() {return MacrosEnabledFlag;} 261 262 /// \brief Control a flag in the parser that enables or disables macros. 263 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;} 264 265 /// \brief Lookup a previously defined macro. 266 /// \param Name Macro name. 267 /// \returns Pointer to macro. NULL if no such macro was defined. 268 const MCAsmMacro* lookupMacro(StringRef Name); 269 270 /// \brief Define a new macro with the given name and information. 271 void defineMacro(StringRef Name, const MCAsmMacro& Macro); 272 273 /// \brief Undefine a macro. If no such macro was defined, it's a no-op. 274 void undefineMacro(StringRef Name); 275 276 /// \brief Are we inside a macro instantiation? 277 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();} 278 279 /// \brief Handle entry to macro instantiation. 280 /// 281 /// \param M The macro. 282 /// \param NameLoc Instantiation location. 283 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc); 284 285 /// \brief Handle exit from macro instantiation. 286 void handleMacroExit(); 287 288 /// \brief Extract AsmTokens for a macro argument. If the argument delimiter 289 /// is initially unknown, set it to AsmToken::Eof. It will be set to the 290 /// correct delimiter by the method. 291 bool parseMacroArgument(MCAsmMacroArgument &MA, 292 AsmToken::TokenKind &ArgumentDelimiter); 293 294 /// \brief Parse all macro arguments for a given macro. 295 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A); 296 297 void printMacroInstantiations(); 298 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, 299 ArrayRef<SMRange> Ranges = None) const { 300 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); 301 } 302 static void DiagHandler(const SMDiagnostic &Diag, void *Context); 303 304 /// \brief Enter the specified file. This returns true on failure. 305 bool enterIncludeFile(const std::string &Filename); 306 307 /// \brief Process the specified file for the .incbin directive. 308 /// This returns true on failure. 309 bool processIncbinFile(const std::string &Filename); 310 311 /// \brief Reset the current lexer position to that given by \p Loc. The 312 /// current token is not set; clients should ensure Lex() is called 313 /// subsequently. 314 /// 315 /// \param InBuffer If not -1, should be the known buffer id that contains the 316 /// location. 317 void jumpToLoc(SMLoc Loc, int InBuffer=-1); 318 319 /// \brief Parse up to the end of statement and a return the contents from the 320 /// current token until the end of the statement; the current token on exit 321 /// will be either the EndOfStatement or EOF. 322 virtual StringRef parseStringToEndOfStatement(); 323 324 /// \brief Parse until the end of a statement or a comma is encountered, 325 /// return the contents from the current token up to the end or comma. 326 StringRef parseStringToComma(); 327 328 bool parseAssignment(StringRef Name, bool allow_redef, 329 bool NoDeadStrip = false); 330 331 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); 332 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); 333 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); 334 335 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); 336 337 // Generic (target and platform independent) directive parsing. 338 enum DirectiveKind { 339 DK_NO_DIRECTIVE, // Placeholder 340 DK_SET, DK_EQU, DK_EQUIV, DK_ASCII, DK_ASCIZ, DK_STRING, DK_BYTE, DK_SHORT, 341 DK_VALUE, DK_2BYTE, DK_LONG, DK_INT, DK_4BYTE, DK_QUAD, DK_8BYTE, DK_SINGLE, 342 DK_FLOAT, DK_DOUBLE, DK_ALIGN, DK_ALIGN32, DK_BALIGN, DK_BALIGNW, 343 DK_BALIGNL, DK_P2ALIGN, DK_P2ALIGNW, DK_P2ALIGNL, DK_ORG, DK_FILL, DK_ENDR, 344 DK_BUNDLE_ALIGN_MODE, DK_BUNDLE_LOCK, DK_BUNDLE_UNLOCK, 345 DK_ZERO, DK_EXTERN, DK_GLOBL, DK_GLOBAL, 346 DK_LAZY_REFERENCE, DK_NO_DEAD_STRIP, DK_SYMBOL_RESOLVER, DK_PRIVATE_EXTERN, 347 DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE, 348 DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT, 349 DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC, 350 DK_IF, DK_IFB, DK_IFNB, DK_IFC, DK_IFNC, DK_IFDEF, DK_IFNDEF, DK_IFNOTDEF, 351 DK_ELSEIF, DK_ELSE, DK_ENDIF, 352 DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS, 353 DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA, 354 DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER, 355 DK_CFI_OFFSET, DK_CFI_REL_OFFSET, DK_CFI_PERSONALITY, DK_CFI_LSDA, 356 DK_CFI_REMEMBER_STATE, DK_CFI_RESTORE_STATE, DK_CFI_SAME_VALUE, 357 DK_CFI_RESTORE, DK_CFI_ESCAPE, DK_CFI_SIGNAL_FRAME, DK_CFI_UNDEFINED, 358 DK_CFI_REGISTER, DK_CFI_WINDOW_SAVE, 359 DK_MACROS_ON, DK_MACROS_OFF, DK_MACRO, DK_ENDM, DK_ENDMACRO, DK_PURGEM, 360 DK_SLEB128, DK_ULEB128 361 }; 362 363 /// \brief Maps directive name --> DirectiveKind enum, for 364 /// directives parsed by this class. 365 StringMap<DirectiveKind> DirectiveKindMap; 366 367 // ".ascii", ".asciz", ".string" 368 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); 369 bool parseDirectiveValue(unsigned Size); // ".byte", ".long", ... 370 bool parseDirectiveRealValue(const fltSemantics &); // ".single", ... 371 bool parseDirectiveFill(); // ".fill" 372 bool parseDirectiveZero(); // ".zero" 373 // ".set", ".equ", ".equiv" 374 bool parseDirectiveSet(StringRef IDVal, bool allow_redef); 375 bool parseDirectiveOrg(); // ".org" 376 // ".align{,32}", ".p2align{,w,l}" 377 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize); 378 379 // ".file", ".line", ".loc", ".stabs" 380 bool parseDirectiveFile(SMLoc DirectiveLoc); 381 bool parseDirectiveLine(); 382 bool parseDirectiveLoc(); 383 bool parseDirectiveStabs(); 384 385 // .cfi directives 386 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc); 387 bool parseDirectiveCFIWindowSave(); 388 bool parseDirectiveCFISections(); 389 bool parseDirectiveCFIStartProc(); 390 bool parseDirectiveCFIEndProc(); 391 bool parseDirectiveCFIDefCfaOffset(); 392 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc); 393 bool parseDirectiveCFIAdjustCfaOffset(); 394 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc); 395 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc); 396 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc); 397 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality); 398 bool parseDirectiveCFIRememberState(); 399 bool parseDirectiveCFIRestoreState(); 400 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc); 401 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc); 402 bool parseDirectiveCFIEscape(); 403 bool parseDirectiveCFISignalFrame(); 404 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc); 405 406 // macro directives 407 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc); 408 bool parseDirectiveEndMacro(StringRef Directive); 409 bool parseDirectiveMacro(SMLoc DirectiveLoc); 410 bool parseDirectiveMacrosOnOff(StringRef Directive); 411 412 // ".bundle_align_mode" 413 bool parseDirectiveBundleAlignMode(); 414 // ".bundle_lock" 415 bool parseDirectiveBundleLock(); 416 // ".bundle_unlock" 417 bool parseDirectiveBundleUnlock(); 418 419 // ".space", ".skip" 420 bool parseDirectiveSpace(StringRef IDVal); 421 422 // .sleb128 (Signed=true) and .uleb128 (Signed=false) 423 bool parseDirectiveLEB128(bool Signed); 424 425 /// \brief Parse a directive like ".globl" which 426 /// accepts a single symbol (which should be a label or an external). 427 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr); 428 429 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" 430 431 bool parseDirectiveAbort(); // ".abort" 432 bool parseDirectiveInclude(); // ".include" 433 bool parseDirectiveIncbin(); // ".incbin" 434 435 bool parseDirectiveIf(SMLoc DirectiveLoc); // ".if" 436 // ".ifb" or ".ifnb", depending on ExpectBlank. 437 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank); 438 // ".ifc" or ".ifnc", depending on ExpectEqual. 439 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual); 440 // ".ifdef" or ".ifndef", depending on expect_defined 441 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); 442 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" 443 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else" 444 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif 445 virtual bool parseEscapedString(std::string &Data); 446 447 const MCExpr *applyModifierToExpr(const MCExpr *E, 448 MCSymbolRefExpr::VariantKind Variant); 449 450 // Macro-like directives 451 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc); 452 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 453 raw_svector_ostream &OS); 454 bool parseDirectiveRept(SMLoc DirectiveLoc); // ".rept" 455 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp" 456 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc" 457 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr" 458 459 // "_emit" or "__emit" 460 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info, 461 size_t Len); 462 463 // "align" 464 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info); 465 466 void initializeDirectiveKindMap(); 467}; 468} 469 470namespace llvm { 471 472extern MCAsmParserExtension *createDarwinAsmParser(); 473extern MCAsmParserExtension *createELFAsmParser(); 474extern MCAsmParserExtension *createCOFFAsmParser(); 475 476} 477 478enum { DEFAULT_ADDRSPACE = 0 }; 479 480AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out, 481 const MCAsmInfo &_MAI) 482 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM), 483 PlatformParser(0), CurBuffer(0), MacrosEnabledFlag(true), 484 CppHashLineNumber(0), AssemblerDialect(~0U), IsDarwin(false), 485 ParsingInlineAsm(false) { 486 // Save the old handler. 487 SavedDiagHandler = SrcMgr.getDiagHandler(); 488 SavedDiagContext = SrcMgr.getDiagContext(); 489 // Set our own handler which calls the saved handler. 490 SrcMgr.setDiagHandler(DiagHandler, this); 491 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 492 493 // Initialize the platform / file format parser. 494 // 495 // FIXME: This is a hack, we need to (majorly) cleanup how these objects are 496 // created. 497 if (_MAI.hasMicrosoftFastStdCallMangling()) { 498 PlatformParser = createCOFFAsmParser(); 499 PlatformParser->Initialize(*this); 500 } else if (_MAI.hasSubsectionsViaSymbols()) { 501 PlatformParser = createDarwinAsmParser(); 502 PlatformParser->Initialize(*this); 503 IsDarwin = true; 504 } else { 505 PlatformParser = createELFAsmParser(); 506 PlatformParser->Initialize(*this); 507 } 508 509 initializeDirectiveKindMap(); 510} 511 512AsmParser::~AsmParser() { 513 assert(ActiveMacros.empty() && "Unexpected active macro instantiation!"); 514 515 // Destroy any macros. 516 for (StringMap<MCAsmMacro *>::iterator it = MacroMap.begin(), 517 ie = MacroMap.end(); 518 it != ie; ++it) 519 delete it->getValue(); 520 521 delete PlatformParser; 522} 523 524void AsmParser::printMacroInstantiations() { 525 // Print the active macro instantiation stack. 526 for (std::vector<MacroInstantiation *>::const_reverse_iterator 527 it = ActiveMacros.rbegin(), 528 ie = ActiveMacros.rend(); 529 it != ie; ++it) 530 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note, 531 "while in macro instantiation"); 532} 533 534bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { 535 if (FatalAssemblerWarnings) 536 return Error(L, Msg, Ranges); 537 printMessage(L, SourceMgr::DK_Warning, Msg, Ranges); 538 printMacroInstantiations(); 539 return false; 540} 541 542bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { 543 HadError = true; 544 printMessage(L, SourceMgr::DK_Error, Msg, Ranges); 545 printMacroInstantiations(); 546 return true; 547} 548 549bool AsmParser::enterIncludeFile(const std::string &Filename) { 550 std::string IncludedFile; 551 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 552 if (NewBuf == -1) 553 return true; 554 555 CurBuffer = NewBuf; 556 557 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 558 559 return false; 560} 561 562/// Process the specified .incbin file by searching for it in the include paths 563/// then just emitting the byte contents of the file to the streamer. This 564/// returns true on failure. 565bool AsmParser::processIncbinFile(const std::string &Filename) { 566 std::string IncludedFile; 567 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 568 if (NewBuf == -1) 569 return true; 570 571 // Pick up the bytes from the file and emit them. 572 getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer()); 573 return false; 574} 575 576void AsmParser::jumpToLoc(SMLoc Loc, int InBuffer) { 577 if (InBuffer != -1) { 578 CurBuffer = InBuffer; 579 } else { 580 CurBuffer = SrcMgr.FindBufferContainingLoc(Loc); 581 } 582 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer()); 583} 584 585const AsmToken &AsmParser::Lex() { 586 const AsmToken *tok = &Lexer.Lex(); 587 588 if (tok->is(AsmToken::Eof)) { 589 // If this is the end of an included file, pop the parent file off the 590 // include stack. 591 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); 592 if (ParentIncludeLoc != SMLoc()) { 593 jumpToLoc(ParentIncludeLoc); 594 tok = &Lexer.Lex(); 595 } 596 } 597 598 if (tok->is(AsmToken::Error)) 599 Error(Lexer.getErrLoc(), Lexer.getErr()); 600 601 return *tok; 602} 603 604bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { 605 // Create the initial section, if requested. 606 if (!NoInitialTextSection) 607 Out.InitSections(); 608 609 // Prime the lexer. 610 Lex(); 611 612 HadError = false; 613 AsmCond StartingCondState = TheCondState; 614 615 // If we are generating dwarf for assembly source files save the initial text 616 // section and generate a .file directive. 617 if (getContext().getGenDwarfForAssembly()) { 618 getContext().setGenDwarfSection(getStreamer().getCurrentSection().first); 619 MCSymbol *SectionStartSym = getContext().CreateTempSymbol(); 620 getStreamer().EmitLabel(SectionStartSym); 621 getContext().setGenDwarfSectionStartSym(SectionStartSym); 622 getStreamer().EmitDwarfFileDirective(getContext().nextGenDwarfFileNumber(), 623 StringRef(), 624 getContext().getMainFileName()); 625 } 626 627 // While we have input, parse each statement. 628 while (Lexer.isNot(AsmToken::Eof)) { 629 ParseStatementInfo Info; 630 if (!parseStatement(Info)) 631 continue; 632 633 // We had an error, validate that one was emitted and recover by skipping to 634 // the next line. 635 assert(HadError && "Parse statement returned an error, but none emitted!"); 636 eatToEndOfStatement(); 637 } 638 639 if (TheCondState.TheCond != StartingCondState.TheCond || 640 TheCondState.Ignore != StartingCondState.Ignore) 641 return TokError("unmatched .ifs or .elses"); 642 643 // Check to see there are no empty DwarfFile slots. 644 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles = 645 getContext().getMCDwarfFiles(); 646 for (unsigned i = 1; i < MCDwarfFiles.size(); i++) { 647 if (!MCDwarfFiles[i]) 648 TokError("unassigned file number: " + Twine(i) + " for .file directives"); 649 } 650 651 // Check to see that all assembler local symbols were actually defined. 652 // Targets that don't do subsections via symbols may not want this, though, 653 // so conservatively exclude them. Only do this if we're finalizing, though, 654 // as otherwise we won't necessarilly have seen everything yet. 655 if (!NoFinalize && MAI.hasSubsectionsViaSymbols()) { 656 const MCContext::SymbolTable &Symbols = getContext().getSymbols(); 657 for (MCContext::SymbolTable::const_iterator i = Symbols.begin(), 658 e = Symbols.end(); 659 i != e; ++i) { 660 MCSymbol *Sym = i->getValue(); 661 // Variable symbols may not be marked as defined, so check those 662 // explicitly. If we know it's a variable, we have a definition for 663 // the purposes of this check. 664 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined()) 665 // FIXME: We would really like to refer back to where the symbol was 666 // first referenced for a source location. We need to add something 667 // to track that. Currently, we just point to the end of the file. 668 printMessage( 669 getLexer().getLoc(), SourceMgr::DK_Error, 670 "assembler local symbol '" + Sym->getName() + "' not defined"); 671 } 672 } 673 674 // Finalize the output stream if there are no errors and if the client wants 675 // us to. 676 if (!HadError && !NoFinalize) 677 Out.Finish(); 678 679 return HadError; 680} 681 682void AsmParser::checkForValidSection() { 683 if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) { 684 TokError("expected section directive before assembly directive"); 685 Out.InitToTextSection(); 686 } 687} 688 689/// \brief Throw away the rest of the line for testing purposes. 690void AsmParser::eatToEndOfStatement() { 691 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 692 Lex(); 693 694 // Eat EOL. 695 if (Lexer.is(AsmToken::EndOfStatement)) 696 Lex(); 697} 698 699StringRef AsmParser::parseStringToEndOfStatement() { 700 const char *Start = getTok().getLoc().getPointer(); 701 702 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 703 Lex(); 704 705 const char *End = getTok().getLoc().getPointer(); 706 return StringRef(Start, End - Start); 707} 708 709StringRef AsmParser::parseStringToComma() { 710 const char *Start = getTok().getLoc().getPointer(); 711 712 while (Lexer.isNot(AsmToken::EndOfStatement) && 713 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof)) 714 Lex(); 715 716 const char *End = getTok().getLoc().getPointer(); 717 return StringRef(Start, End - Start); 718} 719 720/// \brief Parse a paren expression and return it. 721/// NOTE: This assumes the leading '(' has already been consumed. 722/// 723/// parenexpr ::= expr) 724/// 725bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { 726 if (parseExpression(Res)) 727 return true; 728 if (Lexer.isNot(AsmToken::RParen)) 729 return TokError("expected ')' in parentheses expression"); 730 EndLoc = Lexer.getTok().getEndLoc(); 731 Lex(); 732 return false; 733} 734 735/// \brief Parse a bracket expression and return it. 736/// NOTE: This assumes the leading '[' has already been consumed. 737/// 738/// bracketexpr ::= expr] 739/// 740bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { 741 if (parseExpression(Res)) 742 return true; 743 if (Lexer.isNot(AsmToken::RBrac)) 744 return TokError("expected ']' in brackets expression"); 745 EndLoc = Lexer.getTok().getEndLoc(); 746 Lex(); 747 return false; 748} 749 750/// \brief Parse a primary expression and return it. 751/// primaryexpr ::= (parenexpr 752/// primaryexpr ::= symbol 753/// primaryexpr ::= number 754/// primaryexpr ::= '.' 755/// primaryexpr ::= ~,+,- primaryexpr 756bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) { 757 SMLoc FirstTokenLoc = getLexer().getLoc(); 758 AsmToken::TokenKind FirstTokenKind = Lexer.getKind(); 759 switch (FirstTokenKind) { 760 default: 761 return TokError("unknown token in expression"); 762 // If we have an error assume that we've already handled it. 763 case AsmToken::Error: 764 return true; 765 case AsmToken::Exclaim: 766 Lex(); // Eat the operator. 767 if (parsePrimaryExpr(Res, EndLoc)) 768 return true; 769 Res = MCUnaryExpr::CreateLNot(Res, getContext()); 770 return false; 771 case AsmToken::Dollar: 772 case AsmToken::At: 773 case AsmToken::String: 774 case AsmToken::Identifier: { 775 StringRef Identifier; 776 if (parseIdentifier(Identifier)) { 777 if (FirstTokenKind == AsmToken::Dollar) { 778 if (Lexer.getMAI().getDollarIsPC()) { 779 // This is a '$' reference, which references the current PC. Emit a 780 // temporary label to the streamer and refer to it. 781 MCSymbol *Sym = Ctx.CreateTempSymbol(); 782 Out.EmitLabel(Sym); 783 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, 784 getContext()); 785 EndLoc = FirstTokenLoc; 786 return false; 787 } else 788 return Error(FirstTokenLoc, "invalid token in expression"); 789 return true; 790 } 791 } 792 793 EndLoc = SMLoc::getFromPointer(Identifier.end()); 794 795 // This is a symbol reference. 796 StringRef SymbolName = Identifier; 797 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 798 std::pair<StringRef, StringRef> Split = Identifier.split('@'); 799 800 // Lookup the symbol variant if used. 801 if (Split.first.size() != Identifier.size()) { 802 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 803 if (Variant != MCSymbolRefExpr::VK_Invalid) { 804 SymbolName = Split.first; 805 } else if (MAI.doesAllowAtInName()) { 806 Variant = MCSymbolRefExpr::VK_None; 807 } else { 808 Variant = MCSymbolRefExpr::VK_None; 809 return TokError("invalid variant '" + Split.second + "'"); 810 } 811 } 812 813 MCSymbol *Sym = getContext().GetOrCreateSymbol(SymbolName); 814 815 // If this is an absolute variable reference, substitute it now to preserve 816 // semantics in the face of reassignment. 817 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) { 818 if (Variant) 819 return Error(EndLoc, "unexpected modifier on variable reference"); 820 821 Res = Sym->getVariableValue(); 822 return false; 823 } 824 825 // Otherwise create a symbol ref. 826 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext()); 827 return false; 828 } 829 case AsmToken::Integer: { 830 SMLoc Loc = getTok().getLoc(); 831 int64_t IntVal = getTok().getIntVal(); 832 Res = MCConstantExpr::Create(IntVal, getContext()); 833 EndLoc = Lexer.getTok().getEndLoc(); 834 Lex(); // Eat token. 835 // Look for 'b' or 'f' following an Integer as a directional label 836 if (Lexer.getKind() == AsmToken::Identifier) { 837 StringRef IDVal = getTok().getString(); 838 // Lookup the symbol variant if used. 839 std::pair<StringRef, StringRef> Split = IDVal.split('@'); 840 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 841 if (Split.first.size() != IDVal.size()) { 842 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 843 if (Variant == MCSymbolRefExpr::VK_Invalid) { 844 Variant = MCSymbolRefExpr::VK_None; 845 return TokError("invalid variant '" + Split.second + "'"); 846 } 847 IDVal = Split.first; 848 } 849 if (IDVal == "f" || IDVal == "b") { 850 MCSymbol *Sym = 851 Ctx.GetDirectionalLocalSymbol(IntVal, IDVal == "f" ? 1 : 0); 852 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext()); 853 if (IDVal == "b" && Sym->isUndefined()) 854 return Error(Loc, "invalid reference to undefined symbol"); 855 EndLoc = Lexer.getTok().getEndLoc(); 856 Lex(); // Eat identifier. 857 } 858 } 859 return false; 860 } 861 case AsmToken::Real: { 862 APFloat RealVal(APFloat::IEEEdouble, getTok().getString()); 863 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); 864 Res = MCConstantExpr::Create(IntVal, getContext()); 865 EndLoc = Lexer.getTok().getEndLoc(); 866 Lex(); // Eat token. 867 return false; 868 } 869 case AsmToken::Dot: { 870 // This is a '.' reference, which references the current PC. Emit a 871 // temporary label to the streamer and refer to it. 872 MCSymbol *Sym = Ctx.CreateTempSymbol(); 873 Out.EmitLabel(Sym); 874 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext()); 875 EndLoc = Lexer.getTok().getEndLoc(); 876 Lex(); // Eat identifier. 877 return false; 878 } 879 case AsmToken::LParen: 880 Lex(); // Eat the '('. 881 return parseParenExpr(Res, EndLoc); 882 case AsmToken::LBrac: 883 if (!PlatformParser->HasBracketExpressions()) 884 return TokError("brackets expression not supported on this target"); 885 Lex(); // Eat the '['. 886 return parseBracketExpr(Res, EndLoc); 887 case AsmToken::Minus: 888 Lex(); // Eat the operator. 889 if (parsePrimaryExpr(Res, EndLoc)) 890 return true; 891 Res = MCUnaryExpr::CreateMinus(Res, getContext()); 892 return false; 893 case AsmToken::Plus: 894 Lex(); // Eat the operator. 895 if (parsePrimaryExpr(Res, EndLoc)) 896 return true; 897 Res = MCUnaryExpr::CreatePlus(Res, getContext()); 898 return false; 899 case AsmToken::Tilde: 900 Lex(); // Eat the operator. 901 if (parsePrimaryExpr(Res, EndLoc)) 902 return true; 903 Res = MCUnaryExpr::CreateNot(Res, getContext()); 904 return false; 905 } 906} 907 908bool AsmParser::parseExpression(const MCExpr *&Res) { 909 SMLoc EndLoc; 910 return parseExpression(Res, EndLoc); 911} 912 913const MCExpr * 914AsmParser::applyModifierToExpr(const MCExpr *E, 915 MCSymbolRefExpr::VariantKind Variant) { 916 // Ask the target implementation about this expression first. 917 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx); 918 if (NewE) 919 return NewE; 920 // Recurse over the given expression, rebuilding it to apply the given variant 921 // if there is exactly one symbol. 922 switch (E->getKind()) { 923 case MCExpr::Target: 924 case MCExpr::Constant: 925 return 0; 926 927 case MCExpr::SymbolRef: { 928 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); 929 930 if (SRE->getKind() != MCSymbolRefExpr::VK_None) { 931 TokError("invalid variant on expression '" + getTok().getIdentifier() + 932 "' (already modified)"); 933 return E; 934 } 935 936 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext()); 937 } 938 939 case MCExpr::Unary: { 940 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); 941 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant); 942 if (!Sub) 943 return 0; 944 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext()); 945 } 946 947 case MCExpr::Binary: { 948 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); 949 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant); 950 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant); 951 952 if (!LHS && !RHS) 953 return 0; 954 955 if (!LHS) 956 LHS = BE->getLHS(); 957 if (!RHS) 958 RHS = BE->getRHS(); 959 960 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext()); 961 } 962 } 963 964 llvm_unreachable("Invalid expression kind!"); 965} 966 967/// \brief Parse an expression and return it. 968/// 969/// expr ::= expr &&,|| expr -> lowest. 970/// expr ::= expr |,^,&,! expr 971/// expr ::= expr ==,!=,<>,<,<=,>,>= expr 972/// expr ::= expr <<,>> expr 973/// expr ::= expr +,- expr 974/// expr ::= expr *,/,% expr -> highest. 975/// expr ::= primaryexpr 976/// 977bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) { 978 // Parse the expression. 979 Res = 0; 980 if (parsePrimaryExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc)) 981 return true; 982 983 // As a special case, we support 'a op b @ modifier' by rewriting the 984 // expression to include the modifier. This is inefficient, but in general we 985 // expect users to use 'a@modifier op b'. 986 if (Lexer.getKind() == AsmToken::At) { 987 Lex(); 988 989 if (Lexer.isNot(AsmToken::Identifier)) 990 return TokError("unexpected symbol modifier following '@'"); 991 992 MCSymbolRefExpr::VariantKind Variant = 993 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); 994 if (Variant == MCSymbolRefExpr::VK_Invalid) 995 return TokError("invalid variant '" + getTok().getIdentifier() + "'"); 996 997 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant); 998 if (!ModifiedRes) { 999 return TokError("invalid modifier '" + getTok().getIdentifier() + 1000 "' (no symbols present)"); 1001 } 1002 1003 Res = ModifiedRes; 1004 Lex(); 1005 } 1006 1007 // Try to constant fold it up front, if possible. 1008 int64_t Value; 1009 if (Res->EvaluateAsAbsolute(Value)) 1010 Res = MCConstantExpr::Create(Value, getContext()); 1011 1012 return false; 1013} 1014 1015bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1016 Res = 0; 1017 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc); 1018} 1019 1020bool AsmParser::parseAbsoluteExpression(int64_t &Res) { 1021 const MCExpr *Expr; 1022 1023 SMLoc StartLoc = Lexer.getLoc(); 1024 if (parseExpression(Expr)) 1025 return true; 1026 1027 if (!Expr->EvaluateAsAbsolute(Res)) 1028 return Error(StartLoc, "expected absolute expression"); 1029 1030 return false; 1031} 1032 1033static unsigned getBinOpPrecedence(AsmToken::TokenKind K, 1034 MCBinaryExpr::Opcode &Kind) { 1035 switch (K) { 1036 default: 1037 return 0; // not a binop. 1038 1039 // Lowest Precedence: &&, || 1040 case AsmToken::AmpAmp: 1041 Kind = MCBinaryExpr::LAnd; 1042 return 1; 1043 case AsmToken::PipePipe: 1044 Kind = MCBinaryExpr::LOr; 1045 return 1; 1046 1047 // Low Precedence: |, &, ^ 1048 // 1049 // FIXME: gas seems to support '!' as an infix operator? 1050 case AsmToken::Pipe: 1051 Kind = MCBinaryExpr::Or; 1052 return 2; 1053 case AsmToken::Caret: 1054 Kind = MCBinaryExpr::Xor; 1055 return 2; 1056 case AsmToken::Amp: 1057 Kind = MCBinaryExpr::And; 1058 return 2; 1059 1060 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= 1061 case AsmToken::EqualEqual: 1062 Kind = MCBinaryExpr::EQ; 1063 return 3; 1064 case AsmToken::ExclaimEqual: 1065 case AsmToken::LessGreater: 1066 Kind = MCBinaryExpr::NE; 1067 return 3; 1068 case AsmToken::Less: 1069 Kind = MCBinaryExpr::LT; 1070 return 3; 1071 case AsmToken::LessEqual: 1072 Kind = MCBinaryExpr::LTE; 1073 return 3; 1074 case AsmToken::Greater: 1075 Kind = MCBinaryExpr::GT; 1076 return 3; 1077 case AsmToken::GreaterEqual: 1078 Kind = MCBinaryExpr::GTE; 1079 return 3; 1080 1081 // Intermediate Precedence: <<, >> 1082 case AsmToken::LessLess: 1083 Kind = MCBinaryExpr::Shl; 1084 return 4; 1085 case AsmToken::GreaterGreater: 1086 Kind = MCBinaryExpr::Shr; 1087 return 4; 1088 1089 // High Intermediate Precedence: +, - 1090 case AsmToken::Plus: 1091 Kind = MCBinaryExpr::Add; 1092 return 5; 1093 case AsmToken::Minus: 1094 Kind = MCBinaryExpr::Sub; 1095 return 5; 1096 1097 // Highest Precedence: *, /, % 1098 case AsmToken::Star: 1099 Kind = MCBinaryExpr::Mul; 1100 return 6; 1101 case AsmToken::Slash: 1102 Kind = MCBinaryExpr::Div; 1103 return 6; 1104 case AsmToken::Percent: 1105 Kind = MCBinaryExpr::Mod; 1106 return 6; 1107 } 1108} 1109 1110/// \brief Parse all binary operators with precedence >= 'Precedence'. 1111/// Res contains the LHS of the expression on input. 1112bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, 1113 SMLoc &EndLoc) { 1114 while (1) { 1115 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; 1116 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); 1117 1118 // If the next token is lower precedence than we are allowed to eat, return 1119 // successfully with what we ate already. 1120 if (TokPrec < Precedence) 1121 return false; 1122 1123 Lex(); 1124 1125 // Eat the next primary expression. 1126 const MCExpr *RHS; 1127 if (parsePrimaryExpr(RHS, EndLoc)) 1128 return true; 1129 1130 // If BinOp binds less tightly with RHS than the operator after RHS, let 1131 // the pending operator take RHS as its LHS. 1132 MCBinaryExpr::Opcode Dummy; 1133 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); 1134 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc)) 1135 return true; 1136 1137 // Merge LHS and RHS according to operator. 1138 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext()); 1139 } 1140} 1141 1142/// ParseStatement: 1143/// ::= EndOfStatement 1144/// ::= Label* Directive ...Operands... EndOfStatement 1145/// ::= Label* Identifier OperandList* EndOfStatement 1146bool AsmParser::parseStatement(ParseStatementInfo &Info) { 1147 if (Lexer.is(AsmToken::EndOfStatement)) { 1148 Out.AddBlankLine(); 1149 Lex(); 1150 return false; 1151 } 1152 1153 // Statements always start with an identifier or are a full line comment. 1154 AsmToken ID = getTok(); 1155 SMLoc IDLoc = ID.getLoc(); 1156 StringRef IDVal; 1157 int64_t LocalLabelVal = -1; 1158 // A full line comment is a '#' as the first token. 1159 if (Lexer.is(AsmToken::Hash)) 1160 return parseCppHashLineFilenameComment(IDLoc); 1161 1162 // Allow an integer followed by a ':' as a directional local label. 1163 if (Lexer.is(AsmToken::Integer)) { 1164 LocalLabelVal = getTok().getIntVal(); 1165 if (LocalLabelVal < 0) { 1166 if (!TheCondState.Ignore) 1167 return TokError("unexpected token at start of statement"); 1168 IDVal = ""; 1169 } else { 1170 IDVal = getTok().getString(); 1171 Lex(); // Consume the integer token to be used as an identifier token. 1172 if (Lexer.getKind() != AsmToken::Colon) { 1173 if (!TheCondState.Ignore) 1174 return TokError("unexpected token at start of statement"); 1175 } 1176 } 1177 } else if (Lexer.is(AsmToken::Dot)) { 1178 // Treat '.' as a valid identifier in this context. 1179 Lex(); 1180 IDVal = "."; 1181 } else if (parseIdentifier(IDVal)) { 1182 if (!TheCondState.Ignore) 1183 return TokError("unexpected token at start of statement"); 1184 IDVal = ""; 1185 } 1186 1187 // Handle conditional assembly here before checking for skipping. We 1188 // have to do this so that .endif isn't skipped in a ".if 0" block for 1189 // example. 1190 StringMap<DirectiveKind>::const_iterator DirKindIt = 1191 DirectiveKindMap.find(IDVal); 1192 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end()) 1193 ? DK_NO_DIRECTIVE 1194 : DirKindIt->getValue(); 1195 switch (DirKind) { 1196 default: 1197 break; 1198 case DK_IF: 1199 return parseDirectiveIf(IDLoc); 1200 case DK_IFB: 1201 return parseDirectiveIfb(IDLoc, true); 1202 case DK_IFNB: 1203 return parseDirectiveIfb(IDLoc, false); 1204 case DK_IFC: 1205 return parseDirectiveIfc(IDLoc, true); 1206 case DK_IFNC: 1207 return parseDirectiveIfc(IDLoc, false); 1208 case DK_IFDEF: 1209 return parseDirectiveIfdef(IDLoc, true); 1210 case DK_IFNDEF: 1211 case DK_IFNOTDEF: 1212 return parseDirectiveIfdef(IDLoc, false); 1213 case DK_ELSEIF: 1214 return parseDirectiveElseIf(IDLoc); 1215 case DK_ELSE: 1216 return parseDirectiveElse(IDLoc); 1217 case DK_ENDIF: 1218 return parseDirectiveEndIf(IDLoc); 1219 } 1220 1221 // Ignore the statement if in the middle of inactive conditional 1222 // (e.g. ".if 0"). 1223 if (TheCondState.Ignore) { 1224 eatToEndOfStatement(); 1225 return false; 1226 } 1227 1228 // FIXME: Recurse on local labels? 1229 1230 // See what kind of statement we have. 1231 switch (Lexer.getKind()) { 1232 case AsmToken::Colon: { 1233 checkForValidSection(); 1234 1235 // identifier ':' -> Label. 1236 Lex(); 1237 1238 // Diagnose attempt to use '.' as a label. 1239 if (IDVal == ".") 1240 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label"); 1241 1242 // Diagnose attempt to use a variable as a label. 1243 // 1244 // FIXME: Diagnostics. Note the location of the definition as a label. 1245 // FIXME: This doesn't diagnose assignment to a symbol which has been 1246 // implicitly marked as external. 1247 MCSymbol *Sym; 1248 if (LocalLabelVal == -1) 1249 Sym = getContext().GetOrCreateSymbol(IDVal); 1250 else 1251 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal); 1252 if (!Sym->isUndefined() || Sym->isVariable()) 1253 return Error(IDLoc, "invalid symbol redefinition"); 1254 1255 // Emit the label. 1256 if (!ParsingInlineAsm) 1257 Out.EmitLabel(Sym); 1258 1259 // If we are generating dwarf for assembly source files then gather the 1260 // info to make a dwarf label entry for this label if needed. 1261 if (getContext().getGenDwarfForAssembly()) 1262 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 1263 IDLoc); 1264 1265 getTargetParser().onLabelParsed(Sym); 1266 1267 // Consume any end of statement token, if present, to avoid spurious 1268 // AddBlankLine calls(). 1269 if (Lexer.is(AsmToken::EndOfStatement)) { 1270 Lex(); 1271 if (Lexer.is(AsmToken::Eof)) 1272 return false; 1273 } 1274 1275 return false; 1276 } 1277 1278 case AsmToken::Equal: 1279 // identifier '=' ... -> assignment statement 1280 Lex(); 1281 1282 return parseAssignment(IDVal, true); 1283 1284 default: // Normal instruction or directive. 1285 break; 1286 } 1287 1288 // If macros are enabled, check to see if this is a macro instantiation. 1289 if (areMacrosEnabled()) 1290 if (const MCAsmMacro *M = lookupMacro(IDVal)) { 1291 return handleMacroEntry(M, IDLoc); 1292 } 1293 1294 // Otherwise, we have a normal instruction or directive. 1295 1296 // Directives start with "." 1297 if (IDVal[0] == '.' && IDVal != ".") { 1298 // There are several entities interested in parsing directives: 1299 // 1300 // 1. The target-specific assembly parser. Some directives are target 1301 // specific or may potentially behave differently on certain targets. 1302 // 2. Asm parser extensions. For example, platform-specific parsers 1303 // (like the ELF parser) register themselves as extensions. 1304 // 3. The generic directive parser implemented by this class. These are 1305 // all the directives that behave in a target and platform independent 1306 // manner, or at least have a default behavior that's shared between 1307 // all targets and platforms. 1308 1309 // First query the target-specific parser. It will return 'true' if it 1310 // isn't interested in this directive. 1311 if (!getTargetParser().ParseDirective(ID)) 1312 return false; 1313 1314 // Next, check the extention directive map to see if any extension has 1315 // registered itself to parse this directive. 1316 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler = 1317 ExtensionDirectiveMap.lookup(IDVal); 1318 if (Handler.first) 1319 return (*Handler.second)(Handler.first, IDVal, IDLoc); 1320 1321 // Finally, if no one else is interested in this directive, it must be 1322 // generic and familiar to this class. 1323 switch (DirKind) { 1324 default: 1325 break; 1326 case DK_SET: 1327 case DK_EQU: 1328 return parseDirectiveSet(IDVal, true); 1329 case DK_EQUIV: 1330 return parseDirectiveSet(IDVal, false); 1331 case DK_ASCII: 1332 return parseDirectiveAscii(IDVal, false); 1333 case DK_ASCIZ: 1334 case DK_STRING: 1335 return parseDirectiveAscii(IDVal, true); 1336 case DK_BYTE: 1337 return parseDirectiveValue(1); 1338 case DK_SHORT: 1339 case DK_VALUE: 1340 case DK_2BYTE: 1341 return parseDirectiveValue(2); 1342 case DK_LONG: 1343 case DK_INT: 1344 case DK_4BYTE: 1345 return parseDirectiveValue(4); 1346 case DK_QUAD: 1347 case DK_8BYTE: 1348 return parseDirectiveValue(8); 1349 case DK_SINGLE: 1350 case DK_FLOAT: 1351 return parseDirectiveRealValue(APFloat::IEEEsingle); 1352 case DK_DOUBLE: 1353 return parseDirectiveRealValue(APFloat::IEEEdouble); 1354 case DK_ALIGN: { 1355 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 1356 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1); 1357 } 1358 case DK_ALIGN32: { 1359 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 1360 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4); 1361 } 1362 case DK_BALIGN: 1363 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); 1364 case DK_BALIGNW: 1365 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); 1366 case DK_BALIGNL: 1367 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); 1368 case DK_P2ALIGN: 1369 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); 1370 case DK_P2ALIGNW: 1371 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); 1372 case DK_P2ALIGNL: 1373 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); 1374 case DK_ORG: 1375 return parseDirectiveOrg(); 1376 case DK_FILL: 1377 return parseDirectiveFill(); 1378 case DK_ZERO: 1379 return parseDirectiveZero(); 1380 case DK_EXTERN: 1381 eatToEndOfStatement(); // .extern is the default, ignore it. 1382 return false; 1383 case DK_GLOBL: 1384 case DK_GLOBAL: 1385 return parseDirectiveSymbolAttribute(MCSA_Global); 1386 case DK_LAZY_REFERENCE: 1387 return parseDirectiveSymbolAttribute(MCSA_LazyReference); 1388 case DK_NO_DEAD_STRIP: 1389 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip); 1390 case DK_SYMBOL_RESOLVER: 1391 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver); 1392 case DK_PRIVATE_EXTERN: 1393 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern); 1394 case DK_REFERENCE: 1395 return parseDirectiveSymbolAttribute(MCSA_Reference); 1396 case DK_WEAK_DEFINITION: 1397 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition); 1398 case DK_WEAK_REFERENCE: 1399 return parseDirectiveSymbolAttribute(MCSA_WeakReference); 1400 case DK_WEAK_DEF_CAN_BE_HIDDEN: 1401 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); 1402 case DK_COMM: 1403 case DK_COMMON: 1404 return parseDirectiveComm(/*IsLocal=*/false); 1405 case DK_LCOMM: 1406 return parseDirectiveComm(/*IsLocal=*/true); 1407 case DK_ABORT: 1408 return parseDirectiveAbort(); 1409 case DK_INCLUDE: 1410 return parseDirectiveInclude(); 1411 case DK_INCBIN: 1412 return parseDirectiveIncbin(); 1413 case DK_CODE16: 1414 case DK_CODE16GCC: 1415 return TokError(Twine(IDVal) + " not supported yet"); 1416 case DK_REPT: 1417 return parseDirectiveRept(IDLoc); 1418 case DK_IRP: 1419 return parseDirectiveIrp(IDLoc); 1420 case DK_IRPC: 1421 return parseDirectiveIrpc(IDLoc); 1422 case DK_ENDR: 1423 return parseDirectiveEndr(IDLoc); 1424 case DK_BUNDLE_ALIGN_MODE: 1425 return parseDirectiveBundleAlignMode(); 1426 case DK_BUNDLE_LOCK: 1427 return parseDirectiveBundleLock(); 1428 case DK_BUNDLE_UNLOCK: 1429 return parseDirectiveBundleUnlock(); 1430 case DK_SLEB128: 1431 return parseDirectiveLEB128(true); 1432 case DK_ULEB128: 1433 return parseDirectiveLEB128(false); 1434 case DK_SPACE: 1435 case DK_SKIP: 1436 return parseDirectiveSpace(IDVal); 1437 case DK_FILE: 1438 return parseDirectiveFile(IDLoc); 1439 case DK_LINE: 1440 return parseDirectiveLine(); 1441 case DK_LOC: 1442 return parseDirectiveLoc(); 1443 case DK_STABS: 1444 return parseDirectiveStabs(); 1445 case DK_CFI_SECTIONS: 1446 return parseDirectiveCFISections(); 1447 case DK_CFI_STARTPROC: 1448 return parseDirectiveCFIStartProc(); 1449 case DK_CFI_ENDPROC: 1450 return parseDirectiveCFIEndProc(); 1451 case DK_CFI_DEF_CFA: 1452 return parseDirectiveCFIDefCfa(IDLoc); 1453 case DK_CFI_DEF_CFA_OFFSET: 1454 return parseDirectiveCFIDefCfaOffset(); 1455 case DK_CFI_ADJUST_CFA_OFFSET: 1456 return parseDirectiveCFIAdjustCfaOffset(); 1457 case DK_CFI_DEF_CFA_REGISTER: 1458 return parseDirectiveCFIDefCfaRegister(IDLoc); 1459 case DK_CFI_OFFSET: 1460 return parseDirectiveCFIOffset(IDLoc); 1461 case DK_CFI_REL_OFFSET: 1462 return parseDirectiveCFIRelOffset(IDLoc); 1463 case DK_CFI_PERSONALITY: 1464 return parseDirectiveCFIPersonalityOrLsda(true); 1465 case DK_CFI_LSDA: 1466 return parseDirectiveCFIPersonalityOrLsda(false); 1467 case DK_CFI_REMEMBER_STATE: 1468 return parseDirectiveCFIRememberState(); 1469 case DK_CFI_RESTORE_STATE: 1470 return parseDirectiveCFIRestoreState(); 1471 case DK_CFI_SAME_VALUE: 1472 return parseDirectiveCFISameValue(IDLoc); 1473 case DK_CFI_RESTORE: 1474 return parseDirectiveCFIRestore(IDLoc); 1475 case DK_CFI_ESCAPE: 1476 return parseDirectiveCFIEscape(); 1477 case DK_CFI_SIGNAL_FRAME: 1478 return parseDirectiveCFISignalFrame(); 1479 case DK_CFI_UNDEFINED: 1480 return parseDirectiveCFIUndefined(IDLoc); 1481 case DK_CFI_REGISTER: 1482 return parseDirectiveCFIRegister(IDLoc); 1483 case DK_CFI_WINDOW_SAVE: 1484 return parseDirectiveCFIWindowSave(); 1485 case DK_MACROS_ON: 1486 case DK_MACROS_OFF: 1487 return parseDirectiveMacrosOnOff(IDVal); 1488 case DK_MACRO: 1489 return parseDirectiveMacro(IDLoc); 1490 case DK_ENDM: 1491 case DK_ENDMACRO: 1492 return parseDirectiveEndMacro(IDVal); 1493 case DK_PURGEM: 1494 return parseDirectivePurgeMacro(IDLoc); 1495 } 1496 1497 return Error(IDLoc, "unknown directive"); 1498 } 1499 1500 // __asm _emit or __asm __emit 1501 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" || 1502 IDVal == "_EMIT" || IDVal == "__EMIT")) 1503 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size()); 1504 1505 // __asm align 1506 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN")) 1507 return parseDirectiveMSAlign(IDLoc, Info); 1508 1509 checkForValidSection(); 1510 1511 // Canonicalize the opcode to lower case. 1512 std::string OpcodeStr = IDVal.lower(); 1513 ParseInstructionInfo IInfo(Info.AsmRewrites); 1514 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, IDLoc, 1515 Info.ParsedOperands); 1516 Info.ParseError = HadError; 1517 1518 // Dump the parsed representation, if requested. 1519 if (getShowParsedOperands()) { 1520 SmallString<256> Str; 1521 raw_svector_ostream OS(Str); 1522 OS << "parsed instruction: ["; 1523 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) { 1524 if (i != 0) 1525 OS << ", "; 1526 Info.ParsedOperands[i]->print(OS); 1527 } 1528 OS << "]"; 1529 1530 printMessage(IDLoc, SourceMgr::DK_Note, OS.str()); 1531 } 1532 1533 // If we are generating dwarf for assembly source files and the current 1534 // section is the initial text section then generate a .loc directive for 1535 // the instruction. 1536 if (!HadError && getContext().getGenDwarfForAssembly() && 1537 getContext().getGenDwarfSection() == 1538 getStreamer().getCurrentSection().first) { 1539 1540 unsigned Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer); 1541 1542 // If we previously parsed a cpp hash file line comment then make sure the 1543 // current Dwarf File is for the CppHashFilename if not then emit the 1544 // Dwarf File table for it and adjust the line number for the .loc. 1545 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles = 1546 getContext().getMCDwarfFiles(); 1547 if (CppHashFilename.size() != 0) { 1548 if (MCDwarfFiles[getContext().getGenDwarfFileNumber()]->getName() != 1549 CppHashFilename) 1550 getStreamer().EmitDwarfFileDirective( 1551 getContext().nextGenDwarfFileNumber(), StringRef(), 1552 CppHashFilename); 1553 1554 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's 1555 // cache with the different Loc from the call above we save the last 1556 // info we queried here with SrcMgr.FindLineNumber(). 1557 unsigned CppHashLocLineNo; 1558 if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf) 1559 CppHashLocLineNo = LastQueryLine; 1560 else { 1561 CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf); 1562 LastQueryLine = CppHashLocLineNo; 1563 LastQueryIDLoc = CppHashLoc; 1564 LastQueryBuffer = CppHashBuf; 1565 } 1566 Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo); 1567 } 1568 1569 getStreamer().EmitDwarfLocDirective( 1570 getContext().getGenDwarfFileNumber(), Line, 0, 1571 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0, 1572 StringRef()); 1573 } 1574 1575 // If parsing succeeded, match the instruction. 1576 if (!HadError) { 1577 unsigned ErrorInfo; 1578 HadError = getTargetParser().MatchAndEmitInstruction( 1579 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo, 1580 ParsingInlineAsm); 1581 } 1582 1583 // Don't skip the rest of the line, the instruction parser is responsible for 1584 // that. 1585 return false; 1586} 1587 1588/// eatToEndOfLine uses the Lexer to eat the characters to the end of the line 1589/// since they may not be able to be tokenized to get to the end of line token. 1590void AsmParser::eatToEndOfLine() { 1591 if (!Lexer.is(AsmToken::EndOfStatement)) 1592 Lexer.LexUntilEndOfLine(); 1593 // Eat EOL. 1594 Lex(); 1595} 1596 1597/// parseCppHashLineFilenameComment as this: 1598/// ::= # number "filename" 1599/// or just as a full line comment if it doesn't have a number and a string. 1600bool AsmParser::parseCppHashLineFilenameComment(const SMLoc &L) { 1601 Lex(); // Eat the hash token. 1602 1603 if (getLexer().isNot(AsmToken::Integer)) { 1604 // Consume the line since in cases it is not a well-formed line directive, 1605 // as if were simply a full line comment. 1606 eatToEndOfLine(); 1607 return false; 1608 } 1609 1610 int64_t LineNumber = getTok().getIntVal(); 1611 Lex(); 1612 1613 if (getLexer().isNot(AsmToken::String)) { 1614 eatToEndOfLine(); 1615 return false; 1616 } 1617 1618 StringRef Filename = getTok().getString(); 1619 // Get rid of the enclosing quotes. 1620 Filename = Filename.substr(1, Filename.size() - 2); 1621 1622 // Save the SMLoc, Filename and LineNumber for later use by diagnostics. 1623 CppHashLoc = L; 1624 CppHashFilename = Filename; 1625 CppHashLineNumber = LineNumber; 1626 CppHashBuf = CurBuffer; 1627 1628 // Ignore any trailing characters, they're just comment. 1629 eatToEndOfLine(); 1630 return false; 1631} 1632 1633/// \brief will use the last parsed cpp hash line filename comment 1634/// for the Filename and LineNo if any in the diagnostic. 1635void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) { 1636 const AsmParser *Parser = static_cast<const AsmParser *>(Context); 1637 raw_ostream &OS = errs(); 1638 1639 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr(); 1640 const SMLoc &DiagLoc = Diag.getLoc(); 1641 int DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 1642 int CppHashBuf = Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc); 1643 1644 // Like SourceMgr::printMessage() we need to print the include stack if any 1645 // before printing the message. 1646 int DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 1647 if (!Parser->SavedDiagHandler && DiagCurBuffer > 0) { 1648 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer); 1649 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS); 1650 } 1651 1652 // If we have not parsed a cpp hash line filename comment or the source 1653 // manager changed or buffer changed (like in a nested include) then just 1654 // print the normal diagnostic using its Filename and LineNo. 1655 if (!Parser->CppHashLineNumber || &DiagSrcMgr != &Parser->SrcMgr || 1656 DiagBuf != CppHashBuf) { 1657 if (Parser->SavedDiagHandler) 1658 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 1659 else 1660 Diag.print(0, OS); 1661 return; 1662 } 1663 1664 // Use the CppHashFilename and calculate a line number based on the 1665 // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for 1666 // the diagnostic. 1667 const std::string &Filename = Parser->CppHashFilename; 1668 1669 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf); 1670 int CppHashLocLineNo = 1671 Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf); 1672 int LineNo = 1673 Parser->CppHashLineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo); 1674 1675 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo, 1676 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(), 1677 Diag.getLineContents(), Diag.getRanges()); 1678 1679 if (Parser->SavedDiagHandler) 1680 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext); 1681 else 1682 NewDiag.print(0, OS); 1683} 1684 1685// FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The 1686// difference being that that function accepts '@' as part of identifiers and 1687// we can't do that. AsmLexer.cpp should probably be changed to handle 1688// '@' as a special case when needed. 1689static bool isIdentifierChar(char c) { 1690 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' || 1691 c == '.'; 1692} 1693 1694bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body, 1695 const MCAsmMacroParameters &Parameters, 1696 const MCAsmMacroArguments &A, const SMLoc &L) { 1697 unsigned NParameters = Parameters.size(); 1698 if ((!IsDarwin || NParameters != 0) && NParameters != A.size()) 1699 return Error(L, "Wrong number of arguments"); 1700 1701 // A macro without parameters is handled differently on Darwin: 1702 // gas accepts no arguments and does no substitutions 1703 while (!Body.empty()) { 1704 // Scan for the next substitution. 1705 std::size_t End = Body.size(), Pos = 0; 1706 for (; Pos != End; ++Pos) { 1707 // Check for a substitution or escape. 1708 if (IsDarwin && !NParameters) { 1709 // This macro has no parameters, look for $0, $1, etc. 1710 if (Body[Pos] != '$' || Pos + 1 == End) 1711 continue; 1712 1713 char Next = Body[Pos + 1]; 1714 if (Next == '$' || Next == 'n' || 1715 isdigit(static_cast<unsigned char>(Next))) 1716 break; 1717 } else { 1718 // This macro has parameters, look for \foo, \bar, etc. 1719 if (Body[Pos] == '\\' && Pos + 1 != End) 1720 break; 1721 } 1722 } 1723 1724 // Add the prefix. 1725 OS << Body.slice(0, Pos); 1726 1727 // Check if we reached the end. 1728 if (Pos == End) 1729 break; 1730 1731 if (IsDarwin && !NParameters) { 1732 switch (Body[Pos + 1]) { 1733 // $$ => $ 1734 case '$': 1735 OS << '$'; 1736 break; 1737 1738 // $n => number of arguments 1739 case 'n': 1740 OS << A.size(); 1741 break; 1742 1743 // $[0-9] => argument 1744 default: { 1745 // Missing arguments are ignored. 1746 unsigned Index = Body[Pos + 1] - '0'; 1747 if (Index >= A.size()) 1748 break; 1749 1750 // Otherwise substitute with the token values, with spaces eliminated. 1751 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(), 1752 ie = A[Index].end(); 1753 it != ie; ++it) 1754 OS << it->getString(); 1755 break; 1756 } 1757 } 1758 Pos += 2; 1759 } else { 1760 unsigned I = Pos + 1; 1761 while (isIdentifierChar(Body[I]) && I + 1 != End) 1762 ++I; 1763 1764 const char *Begin = Body.data() + Pos + 1; 1765 StringRef Argument(Begin, I - (Pos + 1)); 1766 unsigned Index = 0; 1767 for (; Index < NParameters; ++Index) 1768 if (Parameters[Index].first == Argument) 1769 break; 1770 1771 if (Index == NParameters) { 1772 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 1773 Pos += 3; 1774 else { 1775 OS << '\\' << Argument; 1776 Pos = I; 1777 } 1778 } else { 1779 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(), 1780 ie = A[Index].end(); 1781 it != ie; ++it) 1782 if (it->getKind() == AsmToken::String) 1783 OS << it->getStringContents(); 1784 else 1785 OS << it->getString(); 1786 1787 Pos += 1 + Argument.size(); 1788 } 1789 } 1790 // Update the scan point. 1791 Body = Body.substr(Pos); 1792 } 1793 1794 return false; 1795} 1796 1797MacroInstantiation::MacroInstantiation(const MCAsmMacro *M, SMLoc IL, int EB, 1798 SMLoc EL, MemoryBuffer *I) 1799 : TheMacro(M), Instantiation(I), InstantiationLoc(IL), ExitBuffer(EB), 1800 ExitLoc(EL) {} 1801 1802static bool isOperator(AsmToken::TokenKind kind) { 1803 switch (kind) { 1804 default: 1805 return false; 1806 case AsmToken::Plus: 1807 case AsmToken::Minus: 1808 case AsmToken::Tilde: 1809 case AsmToken::Slash: 1810 case AsmToken::Star: 1811 case AsmToken::Dot: 1812 case AsmToken::Equal: 1813 case AsmToken::EqualEqual: 1814 case AsmToken::Pipe: 1815 case AsmToken::PipePipe: 1816 case AsmToken::Caret: 1817 case AsmToken::Amp: 1818 case AsmToken::AmpAmp: 1819 case AsmToken::Exclaim: 1820 case AsmToken::ExclaimEqual: 1821 case AsmToken::Percent: 1822 case AsmToken::Less: 1823 case AsmToken::LessEqual: 1824 case AsmToken::LessLess: 1825 case AsmToken::LessGreater: 1826 case AsmToken::Greater: 1827 case AsmToken::GreaterEqual: 1828 case AsmToken::GreaterGreater: 1829 return true; 1830 } 1831} 1832 1833bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, 1834 AsmToken::TokenKind &ArgumentDelimiter) { 1835 unsigned ParenLevel = 0; 1836 unsigned AddTokens = 0; 1837 1838 // gas accepts arguments separated by whitespace, except on Darwin 1839 if (!IsDarwin) 1840 Lexer.setSkipSpace(false); 1841 1842 for (;;) { 1843 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) { 1844 Lexer.setSkipSpace(true); 1845 return TokError("unexpected token in macro instantiation"); 1846 } 1847 1848 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) { 1849 // Spaces and commas cannot be mixed to delimit parameters 1850 if (ArgumentDelimiter == AsmToken::Eof) 1851 ArgumentDelimiter = AsmToken::Comma; 1852 else if (ArgumentDelimiter != AsmToken::Comma) { 1853 Lexer.setSkipSpace(true); 1854 return TokError("expected ' ' for macro argument separator"); 1855 } 1856 break; 1857 } 1858 1859 if (Lexer.is(AsmToken::Space)) { 1860 Lex(); // Eat spaces 1861 1862 // Spaces can delimit parameters, but could also be part an expression. 1863 // If the token after a space is an operator, add the token and the next 1864 // one into this argument 1865 if (ArgumentDelimiter == AsmToken::Space || 1866 ArgumentDelimiter == AsmToken::Eof) { 1867 if (isOperator(Lexer.getKind())) { 1868 // Check to see whether the token is used as an operator, 1869 // or part of an identifier 1870 const char *NextChar = getTok().getEndLoc().getPointer(); 1871 if (*NextChar == ' ') 1872 AddTokens = 2; 1873 } 1874 1875 if (!AddTokens && ParenLevel == 0) { 1876 if (ArgumentDelimiter == AsmToken::Eof && 1877 !isOperator(Lexer.getKind())) 1878 ArgumentDelimiter = AsmToken::Space; 1879 break; 1880 } 1881 } 1882 } 1883 1884 // handleMacroEntry relies on not advancing the lexer here 1885 // to be able to fill in the remaining default parameter values 1886 if (Lexer.is(AsmToken::EndOfStatement)) 1887 break; 1888 1889 // Adjust the current parentheses level. 1890 if (Lexer.is(AsmToken::LParen)) 1891 ++ParenLevel; 1892 else if (Lexer.is(AsmToken::RParen) && ParenLevel) 1893 --ParenLevel; 1894 1895 // Append the token to the current argument list. 1896 MA.push_back(getTok()); 1897 if (AddTokens) 1898 AddTokens--; 1899 Lex(); 1900 } 1901 1902 Lexer.setSkipSpace(true); 1903 if (ParenLevel != 0) 1904 return TokError("unbalanced parentheses in macro argument"); 1905 return false; 1906} 1907 1908// Parse the macro instantiation arguments. 1909bool AsmParser::parseMacroArguments(const MCAsmMacro *M, 1910 MCAsmMacroArguments &A) { 1911 const unsigned NParameters = M ? M->Parameters.size() : 0; 1912 // Argument delimiter is initially unknown. It will be set by 1913 // parseMacroArgument() 1914 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof; 1915 1916 // Parse two kinds of macro invocations: 1917 // - macros defined without any parameters accept an arbitrary number of them 1918 // - macros defined with parameters accept at most that many of them 1919 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters; 1920 ++Parameter) { 1921 MCAsmMacroArgument MA; 1922 1923 if (parseMacroArgument(MA, ArgumentDelimiter)) 1924 return true; 1925 1926 if (!MA.empty() || !NParameters) 1927 A.push_back(MA); 1928 else if (NParameters) { 1929 if (!M->Parameters[Parameter].second.empty()) 1930 A.push_back(M->Parameters[Parameter].second); 1931 } 1932 1933 // At the end of the statement, fill in remaining arguments that have 1934 // default values. If there aren't any, then the next argument is 1935 // required but missing 1936 if (Lexer.is(AsmToken::EndOfStatement)) { 1937 if (NParameters && Parameter < NParameters - 1) { 1938 if (M->Parameters[Parameter + 1].second.empty()) 1939 return TokError("macro argument '" + 1940 Twine(M->Parameters[Parameter + 1].first) + 1941 "' is missing"); 1942 else 1943 continue; 1944 } 1945 return false; 1946 } 1947 1948 if (Lexer.is(AsmToken::Comma)) 1949 Lex(); 1950 } 1951 return TokError("Too many arguments"); 1952} 1953 1954const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) { 1955 StringMap<MCAsmMacro *>::iterator I = MacroMap.find(Name); 1956 return (I == MacroMap.end()) ? NULL : I->getValue(); 1957} 1958 1959void AsmParser::defineMacro(StringRef Name, const MCAsmMacro &Macro) { 1960 MacroMap[Name] = new MCAsmMacro(Macro); 1961} 1962 1963void AsmParser::undefineMacro(StringRef Name) { 1964 StringMap<MCAsmMacro *>::iterator I = MacroMap.find(Name); 1965 if (I != MacroMap.end()) { 1966 delete I->getValue(); 1967 MacroMap.erase(I); 1968 } 1969} 1970 1971bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) { 1972 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate 1973 // this, although we should protect against infinite loops. 1974 if (ActiveMacros.size() == 20) 1975 return TokError("macros cannot be nested more than 20 levels deep"); 1976 1977 MCAsmMacroArguments A; 1978 if (parseMacroArguments(M, A)) 1979 return true; 1980 1981 // Remove any trailing empty arguments. Do this after-the-fact as we have 1982 // to keep empty arguments in the middle of the list or positionality 1983 // gets off. e.g., "foo 1, , 2" vs. "foo 1, 2," 1984 while (!A.empty() && A.back().empty()) 1985 A.pop_back(); 1986 1987 // Macro instantiation is lexical, unfortunately. We construct a new buffer 1988 // to hold the macro body with substitutions. 1989 SmallString<256> Buf; 1990 StringRef Body = M->Body; 1991 raw_svector_ostream OS(Buf); 1992 1993 if (expandMacro(OS, Body, M->Parameters, A, getTok().getLoc())) 1994 return true; 1995 1996 // We include the .endmacro in the buffer as our cue to exit the macro 1997 // instantiation. 1998 OS << ".endmacro\n"; 1999 2000 MemoryBuffer *Instantiation = 2001 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 2002 2003 // Create the macro instantiation object and add to the current macro 2004 // instantiation stack. 2005 MacroInstantiation *MI = new MacroInstantiation( 2006 M, NameLoc, CurBuffer, getTok().getLoc(), Instantiation); 2007 ActiveMacros.push_back(MI); 2008 2009 // Jump to the macro instantiation and prime the lexer. 2010 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc()); 2011 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 2012 Lex(); 2013 2014 return false; 2015} 2016 2017void AsmParser::handleMacroExit() { 2018 // Jump to the EndOfStatement we should return to, and consume it. 2019 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer); 2020 Lex(); 2021 2022 // Pop the instantiation entry. 2023 delete ActiveMacros.back(); 2024 ActiveMacros.pop_back(); 2025} 2026 2027static bool isUsedIn(const MCSymbol *Sym, const MCExpr *Value) { 2028 switch (Value->getKind()) { 2029 case MCExpr::Binary: { 2030 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value); 2031 return isUsedIn(Sym, BE->getLHS()) || isUsedIn(Sym, BE->getRHS()); 2032 } 2033 case MCExpr::Target: 2034 case MCExpr::Constant: 2035 return false; 2036 case MCExpr::SymbolRef: { 2037 const MCSymbol &S = 2038 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); 2039 if (S.isVariable()) 2040 return isUsedIn(Sym, S.getVariableValue()); 2041 return &S == Sym; 2042 } 2043 case MCExpr::Unary: 2044 return isUsedIn(Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr()); 2045 } 2046 2047 llvm_unreachable("Unknown expr kind!"); 2048} 2049 2050bool AsmParser::parseAssignment(StringRef Name, bool allow_redef, 2051 bool NoDeadStrip) { 2052 // FIXME: Use better location, we should use proper tokens. 2053 SMLoc EqualLoc = Lexer.getLoc(); 2054 2055 const MCExpr *Value; 2056 if (parseExpression(Value)) 2057 return true; 2058 2059 // Note: we don't count b as used in "a = b". This is to allow 2060 // a = b 2061 // b = c 2062 2063 if (Lexer.isNot(AsmToken::EndOfStatement)) 2064 return TokError("unexpected token in assignment"); 2065 2066 // Error on assignment to '.'. 2067 if (Name == ".") { 2068 return Error(EqualLoc, ("assignment to pseudo-symbol '.' is unsupported " 2069 "(use '.space' or '.org').)")); 2070 } 2071 2072 // Eat the end of statement marker. 2073 Lex(); 2074 2075 // Validate that the LHS is allowed to be a variable (either it has not been 2076 // used as a symbol, or it is an absolute symbol). 2077 MCSymbol *Sym = getContext().LookupSymbol(Name); 2078 if (Sym) { 2079 // Diagnose assignment to a label. 2080 // 2081 // FIXME: Diagnostics. Note the location of the definition as a label. 2082 // FIXME: Diagnose assignment to protected identifier (e.g., register name). 2083 if (isUsedIn(Sym, Value)) 2084 return Error(EqualLoc, "Recursive use of '" + Name + "'"); 2085 else if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable()) 2086 ; // Allow redefinitions of undefined symbols only used in directives. 2087 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef) 2088 ; // Allow redefinitions of variables that haven't yet been used. 2089 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) 2090 return Error(EqualLoc, "redefinition of '" + Name + "'"); 2091 else if (!Sym->isVariable()) 2092 return Error(EqualLoc, "invalid assignment to '" + Name + "'"); 2093 else if (!isa<MCConstantExpr>(Sym->getVariableValue())) 2094 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" + 2095 Name + "'"); 2096 2097 // Don't count these checks as uses. 2098 Sym->setUsed(false); 2099 } else 2100 Sym = getContext().GetOrCreateSymbol(Name); 2101 2102 // FIXME: Handle '.'. 2103 2104 // Do the assignment. 2105 Out.EmitAssignment(Sym, Value); 2106 if (NoDeadStrip) 2107 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip); 2108 2109 return false; 2110} 2111 2112/// parseIdentifier: 2113/// ::= identifier 2114/// ::= string 2115bool AsmParser::parseIdentifier(StringRef &Res) { 2116 // The assembler has relaxed rules for accepting identifiers, in particular we 2117 // allow things like '.globl $foo' and '.def @feat.00', which would normally be 2118 // separate tokens. At this level, we have already lexed so we cannot (currently) 2119 // handle this as a context dependent token, instead we detect adjacent tokens 2120 // and return the combined identifier. 2121 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) { 2122 SMLoc PrefixLoc = getLexer().getLoc(); 2123 2124 // Consume the prefix character, and check for a following identifier. 2125 Lex(); 2126 if (Lexer.isNot(AsmToken::Identifier)) 2127 return true; 2128 2129 // We have a '$' or '@' followed by an identifier, make sure they are adjacent. 2130 if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer()) 2131 return true; 2132 2133 // Construct the joined identifier and consume the token. 2134 Res = 2135 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1); 2136 Lex(); 2137 return false; 2138 } 2139 2140 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String)) 2141 return true; 2142 2143 Res = getTok().getIdentifier(); 2144 2145 Lex(); // Consume the identifier token. 2146 2147 return false; 2148} 2149 2150/// parseDirectiveSet: 2151/// ::= .equ identifier ',' expression 2152/// ::= .equiv identifier ',' expression 2153/// ::= .set identifier ',' expression 2154bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) { 2155 StringRef Name; 2156 2157 if (parseIdentifier(Name)) 2158 return TokError("expected identifier after '" + Twine(IDVal) + "'"); 2159 2160 if (getLexer().isNot(AsmToken::Comma)) 2161 return TokError("unexpected token in '" + Twine(IDVal) + "'"); 2162 Lex(); 2163 2164 return parseAssignment(Name, allow_redef, true); 2165} 2166 2167bool AsmParser::parseEscapedString(std::string &Data) { 2168 assert(getLexer().is(AsmToken::String) && "Unexpected current token!"); 2169 2170 Data = ""; 2171 StringRef Str = getTok().getStringContents(); 2172 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 2173 if (Str[i] != '\\') { 2174 Data += Str[i]; 2175 continue; 2176 } 2177 2178 // Recognize escaped characters. Note that this escape semantics currently 2179 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes. 2180 ++i; 2181 if (i == e) 2182 return TokError("unexpected backslash at end of string"); 2183 2184 // Recognize octal sequences. 2185 if ((unsigned)(Str[i] - '0') <= 7) { 2186 // Consume up to three octal characters. 2187 unsigned Value = Str[i] - '0'; 2188 2189 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 2190 ++i; 2191 Value = Value * 8 + (Str[i] - '0'); 2192 2193 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 2194 ++i; 2195 Value = Value * 8 + (Str[i] - '0'); 2196 } 2197 } 2198 2199 if (Value > 255) 2200 return TokError("invalid octal escape sequence (out of range)"); 2201 2202 Data += (unsigned char)Value; 2203 continue; 2204 } 2205 2206 // Otherwise recognize individual escapes. 2207 switch (Str[i]) { 2208 default: 2209 // Just reject invalid escape sequences for now. 2210 return TokError("invalid escape sequence (unrecognized character)"); 2211 2212 case 'b': Data += '\b'; break; 2213 case 'f': Data += '\f'; break; 2214 case 'n': Data += '\n'; break; 2215 case 'r': Data += '\r'; break; 2216 case 't': Data += '\t'; break; 2217 case '"': Data += '"'; break; 2218 case '\\': Data += '\\'; break; 2219 } 2220 } 2221 2222 return false; 2223} 2224 2225/// parseDirectiveAscii: 2226/// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ] 2227bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { 2228 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2229 checkForValidSection(); 2230 2231 for (;;) { 2232 if (getLexer().isNot(AsmToken::String)) 2233 return TokError("expected string in '" + Twine(IDVal) + "' directive"); 2234 2235 std::string Data; 2236 if (parseEscapedString(Data)) 2237 return true; 2238 2239 getStreamer().EmitBytes(Data); 2240 if (ZeroTerminated) 2241 getStreamer().EmitBytes(StringRef("\0", 1)); 2242 2243 Lex(); 2244 2245 if (getLexer().is(AsmToken::EndOfStatement)) 2246 break; 2247 2248 if (getLexer().isNot(AsmToken::Comma)) 2249 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 2250 Lex(); 2251 } 2252 } 2253 2254 Lex(); 2255 return false; 2256} 2257 2258/// parseDirectiveValue 2259/// ::= (.byte | .short | ... ) [ expression (, expression)* ] 2260bool AsmParser::parseDirectiveValue(unsigned Size) { 2261 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2262 checkForValidSection(); 2263 2264 for (;;) { 2265 const MCExpr *Value; 2266 SMLoc ExprLoc = getLexer().getLoc(); 2267 if (parseExpression(Value)) 2268 return true; 2269 2270 // Special case constant expressions to match code generator. 2271 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 2272 assert(Size <= 8 && "Invalid size"); 2273 uint64_t IntValue = MCE->getValue(); 2274 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 2275 return Error(ExprLoc, "literal value out of range for directive"); 2276 getStreamer().EmitIntValue(IntValue, Size); 2277 } else 2278 getStreamer().EmitValue(Value, Size); 2279 2280 if (getLexer().is(AsmToken::EndOfStatement)) 2281 break; 2282 2283 // FIXME: Improve diagnostic. 2284 if (getLexer().isNot(AsmToken::Comma)) 2285 return TokError("unexpected token in directive"); 2286 Lex(); 2287 } 2288 } 2289 2290 Lex(); 2291 return false; 2292} 2293 2294/// parseDirectiveRealValue 2295/// ::= (.single | .double) [ expression (, expression)* ] 2296bool AsmParser::parseDirectiveRealValue(const fltSemantics &Semantics) { 2297 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2298 checkForValidSection(); 2299 2300 for (;;) { 2301 // We don't truly support arithmetic on floating point expressions, so we 2302 // have to manually parse unary prefixes. 2303 bool IsNeg = false; 2304 if (getLexer().is(AsmToken::Minus)) { 2305 Lex(); 2306 IsNeg = true; 2307 } else if (getLexer().is(AsmToken::Plus)) 2308 Lex(); 2309 2310 if (getLexer().isNot(AsmToken::Integer) && 2311 getLexer().isNot(AsmToken::Real) && 2312 getLexer().isNot(AsmToken::Identifier)) 2313 return TokError("unexpected token in directive"); 2314 2315 // Convert to an APFloat. 2316 APFloat Value(Semantics); 2317 StringRef IDVal = getTok().getString(); 2318 if (getLexer().is(AsmToken::Identifier)) { 2319 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf")) 2320 Value = APFloat::getInf(Semantics); 2321 else if (!IDVal.compare_lower("nan")) 2322 Value = APFloat::getNaN(Semantics, false, ~0); 2323 else 2324 return TokError("invalid floating point literal"); 2325 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) == 2326 APFloat::opInvalidOp) 2327 return TokError("invalid floating point literal"); 2328 if (IsNeg) 2329 Value.changeSign(); 2330 2331 // Consume the numeric token. 2332 Lex(); 2333 2334 // Emit the value as an integer. 2335 APInt AsInt = Value.bitcastToAPInt(); 2336 getStreamer().EmitIntValue(AsInt.getLimitedValue(), 2337 AsInt.getBitWidth() / 8); 2338 2339 if (getLexer().is(AsmToken::EndOfStatement)) 2340 break; 2341 2342 if (getLexer().isNot(AsmToken::Comma)) 2343 return TokError("unexpected token in directive"); 2344 Lex(); 2345 } 2346 } 2347 2348 Lex(); 2349 return false; 2350} 2351 2352/// parseDirectiveZero 2353/// ::= .zero expression 2354bool AsmParser::parseDirectiveZero() { 2355 checkForValidSection(); 2356 2357 int64_t NumBytes; 2358 if (parseAbsoluteExpression(NumBytes)) 2359 return true; 2360 2361 int64_t Val = 0; 2362 if (getLexer().is(AsmToken::Comma)) { 2363 Lex(); 2364 if (parseAbsoluteExpression(Val)) 2365 return true; 2366 } 2367 2368 if (getLexer().isNot(AsmToken::EndOfStatement)) 2369 return TokError("unexpected token in '.zero' directive"); 2370 2371 Lex(); 2372 2373 getStreamer().EmitFill(NumBytes, Val); 2374 2375 return false; 2376} 2377 2378/// parseDirectiveFill 2379/// ::= .fill expression [ , expression [ , expression ] ] 2380bool AsmParser::parseDirectiveFill() { 2381 checkForValidSection(); 2382 2383 int64_t NumValues; 2384 if (parseAbsoluteExpression(NumValues)) 2385 return true; 2386 2387 int64_t FillSize = 1; 2388 int64_t FillExpr = 0; 2389 2390 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2391 if (getLexer().isNot(AsmToken::Comma)) 2392 return TokError("unexpected token in '.fill' directive"); 2393 Lex(); 2394 2395 if (parseAbsoluteExpression(FillSize)) 2396 return true; 2397 2398 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2399 if (getLexer().isNot(AsmToken::Comma)) 2400 return TokError("unexpected token in '.fill' directive"); 2401 Lex(); 2402 2403 if (parseAbsoluteExpression(FillExpr)) 2404 return true; 2405 2406 if (getLexer().isNot(AsmToken::EndOfStatement)) 2407 return TokError("unexpected token in '.fill' directive"); 2408 2409 Lex(); 2410 } 2411 } 2412 2413 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8) 2414 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8"); 2415 2416 for (uint64_t i = 0, e = NumValues; i != e; ++i) 2417 getStreamer().EmitIntValue(FillExpr, FillSize); 2418 2419 return false; 2420} 2421 2422/// parseDirectiveOrg 2423/// ::= .org expression [ , expression ] 2424bool AsmParser::parseDirectiveOrg() { 2425 checkForValidSection(); 2426 2427 const MCExpr *Offset; 2428 SMLoc Loc = getTok().getLoc(); 2429 if (parseExpression(Offset)) 2430 return true; 2431 2432 // Parse optional fill expression. 2433 int64_t FillExpr = 0; 2434 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2435 if (getLexer().isNot(AsmToken::Comma)) 2436 return TokError("unexpected token in '.org' directive"); 2437 Lex(); 2438 2439 if (parseAbsoluteExpression(FillExpr)) 2440 return true; 2441 2442 if (getLexer().isNot(AsmToken::EndOfStatement)) 2443 return TokError("unexpected token in '.org' directive"); 2444 } 2445 2446 Lex(); 2447 2448 // Only limited forms of relocatable expressions are accepted here, it 2449 // has to be relative to the current section. The streamer will return 2450 // 'true' if the expression wasn't evaluatable. 2451 if (getStreamer().EmitValueToOffset(Offset, FillExpr)) 2452 return Error(Loc, "expected assembly-time absolute expression"); 2453 2454 return false; 2455} 2456 2457/// parseDirectiveAlign 2458/// ::= {.align, ...} expression [ , expression [ , expression ]] 2459bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) { 2460 checkForValidSection(); 2461 2462 SMLoc AlignmentLoc = getLexer().getLoc(); 2463 int64_t Alignment; 2464 if (parseAbsoluteExpression(Alignment)) 2465 return true; 2466 2467 SMLoc MaxBytesLoc; 2468 bool HasFillExpr = false; 2469 int64_t FillExpr = 0; 2470 int64_t MaxBytesToFill = 0; 2471 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2472 if (getLexer().isNot(AsmToken::Comma)) 2473 return TokError("unexpected token in directive"); 2474 Lex(); 2475 2476 // The fill expression can be omitted while specifying a maximum number of 2477 // alignment bytes, e.g: 2478 // .align 3,,4 2479 if (getLexer().isNot(AsmToken::Comma)) { 2480 HasFillExpr = true; 2481 if (parseAbsoluteExpression(FillExpr)) 2482 return true; 2483 } 2484 2485 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2486 if (getLexer().isNot(AsmToken::Comma)) 2487 return TokError("unexpected token in directive"); 2488 Lex(); 2489 2490 MaxBytesLoc = getLexer().getLoc(); 2491 if (parseAbsoluteExpression(MaxBytesToFill)) 2492 return true; 2493 2494 if (getLexer().isNot(AsmToken::EndOfStatement)) 2495 return TokError("unexpected token in directive"); 2496 } 2497 } 2498 2499 Lex(); 2500 2501 if (!HasFillExpr) 2502 FillExpr = 0; 2503 2504 // Compute alignment in bytes. 2505 if (IsPow2) { 2506 // FIXME: Diagnose overflow. 2507 if (Alignment >= 32) { 2508 Error(AlignmentLoc, "invalid alignment value"); 2509 Alignment = 31; 2510 } 2511 2512 Alignment = 1ULL << Alignment; 2513 } else { 2514 // Reject alignments that aren't a power of two, for gas compatibility. 2515 if (!isPowerOf2_64(Alignment)) 2516 Error(AlignmentLoc, "alignment must be a power of 2"); 2517 } 2518 2519 // Diagnose non-sensical max bytes to align. 2520 if (MaxBytesLoc.isValid()) { 2521 if (MaxBytesToFill < 1) { 2522 Error(MaxBytesLoc, "alignment directive can never be satisfied in this " 2523 "many bytes, ignoring maximum bytes expression"); 2524 MaxBytesToFill = 0; 2525 } 2526 2527 if (MaxBytesToFill >= Alignment) { 2528 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " 2529 "has no effect"); 2530 MaxBytesToFill = 0; 2531 } 2532 } 2533 2534 // Check whether we should use optimal code alignment for this .align 2535 // directive. 2536 bool UseCodeAlign = getStreamer().getCurrentSection().first->UseCodeAlign(); 2537 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) && 2538 ValueSize == 1 && UseCodeAlign) { 2539 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill); 2540 } else { 2541 // FIXME: Target specific behavior about how the "extra" bytes are filled. 2542 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize, 2543 MaxBytesToFill); 2544 } 2545 2546 return false; 2547} 2548 2549/// parseDirectiveFile 2550/// ::= .file [number] filename 2551/// ::= .file number directory filename 2552bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) { 2553 // FIXME: I'm not sure what this is. 2554 int64_t FileNumber = -1; 2555 SMLoc FileNumberLoc = getLexer().getLoc(); 2556 if (getLexer().is(AsmToken::Integer)) { 2557 FileNumber = getTok().getIntVal(); 2558 Lex(); 2559 2560 if (FileNumber < 1) 2561 return TokError("file number less than one"); 2562 } 2563 2564 if (getLexer().isNot(AsmToken::String)) 2565 return TokError("unexpected token in '.file' directive"); 2566 2567 // Usually the directory and filename together, otherwise just the directory. 2568 // Allow the strings to have escaped octal character sequence. 2569 std::string Path = getTok().getString(); 2570 if (parseEscapedString(Path)) 2571 return true; 2572 Lex(); 2573 2574 StringRef Directory; 2575 StringRef Filename; 2576 std::string FilenameData; 2577 if (getLexer().is(AsmToken::String)) { 2578 if (FileNumber == -1) 2579 return TokError("explicit path specified, but no file number"); 2580 if (parseEscapedString(FilenameData)) 2581 return true; 2582 Filename = FilenameData; 2583 Directory = Path; 2584 Lex(); 2585 } else { 2586 Filename = Path; 2587 } 2588 2589 if (getLexer().isNot(AsmToken::EndOfStatement)) 2590 return TokError("unexpected token in '.file' directive"); 2591 2592 if (FileNumber == -1) 2593 getStreamer().EmitFileDirective(Filename); 2594 else { 2595 if (getContext().getGenDwarfForAssembly() == true) 2596 Error(DirectiveLoc, 2597 "input can't have .file dwarf directives when -g is " 2598 "used to generate dwarf debug info for assembly code"); 2599 2600 if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename)) 2601 Error(FileNumberLoc, "file number already allocated"); 2602 } 2603 2604 return false; 2605} 2606 2607/// parseDirectiveLine 2608/// ::= .line [number] 2609bool AsmParser::parseDirectiveLine() { 2610 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2611 if (getLexer().isNot(AsmToken::Integer)) 2612 return TokError("unexpected token in '.line' directive"); 2613 2614 int64_t LineNumber = getTok().getIntVal(); 2615 (void)LineNumber; 2616 Lex(); 2617 2618 // FIXME: Do something with the .line. 2619 } 2620 2621 if (getLexer().isNot(AsmToken::EndOfStatement)) 2622 return TokError("unexpected token in '.line' directive"); 2623 2624 return false; 2625} 2626 2627/// parseDirectiveLoc 2628/// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] 2629/// [epilogue_begin] [is_stmt VALUE] [isa VALUE] 2630/// The first number is a file number, must have been previously assigned with 2631/// a .file directive, the second number is the line number and optionally the 2632/// third number is a column position (zero if not specified). The remaining 2633/// optional items are .loc sub-directives. 2634bool AsmParser::parseDirectiveLoc() { 2635 if (getLexer().isNot(AsmToken::Integer)) 2636 return TokError("unexpected token in '.loc' directive"); 2637 int64_t FileNumber = getTok().getIntVal(); 2638 if (FileNumber < 1) 2639 return TokError("file number less than one in '.loc' directive"); 2640 if (!getContext().isValidDwarfFileNumber(FileNumber)) 2641 return TokError("unassigned file number in '.loc' directive"); 2642 Lex(); 2643 2644 int64_t LineNumber = 0; 2645 if (getLexer().is(AsmToken::Integer)) { 2646 LineNumber = getTok().getIntVal(); 2647 if (LineNumber < 0) 2648 return TokError("line number less than zero in '.loc' directive"); 2649 Lex(); 2650 } 2651 2652 int64_t ColumnPos = 0; 2653 if (getLexer().is(AsmToken::Integer)) { 2654 ColumnPos = getTok().getIntVal(); 2655 if (ColumnPos < 0) 2656 return TokError("column position less than zero in '.loc' directive"); 2657 Lex(); 2658 } 2659 2660 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; 2661 unsigned Isa = 0; 2662 int64_t Discriminator = 0; 2663 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2664 for (;;) { 2665 if (getLexer().is(AsmToken::EndOfStatement)) 2666 break; 2667 2668 StringRef Name; 2669 SMLoc Loc = getTok().getLoc(); 2670 if (parseIdentifier(Name)) 2671 return TokError("unexpected token in '.loc' directive"); 2672 2673 if (Name == "basic_block") 2674 Flags |= DWARF2_FLAG_BASIC_BLOCK; 2675 else if (Name == "prologue_end") 2676 Flags |= DWARF2_FLAG_PROLOGUE_END; 2677 else if (Name == "epilogue_begin") 2678 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; 2679 else if (Name == "is_stmt") { 2680 Loc = getTok().getLoc(); 2681 const MCExpr *Value; 2682 if (parseExpression(Value)) 2683 return true; 2684 // The expression must be the constant 0 or 1. 2685 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 2686 int Value = MCE->getValue(); 2687 if (Value == 0) 2688 Flags &= ~DWARF2_FLAG_IS_STMT; 2689 else if (Value == 1) 2690 Flags |= DWARF2_FLAG_IS_STMT; 2691 else 2692 return Error(Loc, "is_stmt value not 0 or 1"); 2693 } else { 2694 return Error(Loc, "is_stmt value not the constant value of 0 or 1"); 2695 } 2696 } else if (Name == "isa") { 2697 Loc = getTok().getLoc(); 2698 const MCExpr *Value; 2699 if (parseExpression(Value)) 2700 return true; 2701 // The expression must be a constant greater or equal to 0. 2702 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 2703 int Value = MCE->getValue(); 2704 if (Value < 0) 2705 return Error(Loc, "isa number less than zero"); 2706 Isa = Value; 2707 } else { 2708 return Error(Loc, "isa number not a constant value"); 2709 } 2710 } else if (Name == "discriminator") { 2711 if (parseAbsoluteExpression(Discriminator)) 2712 return true; 2713 } else { 2714 return Error(Loc, "unknown sub-directive in '.loc' directive"); 2715 } 2716 2717 if (getLexer().is(AsmToken::EndOfStatement)) 2718 break; 2719 } 2720 } 2721 2722 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, 2723 Isa, Discriminator, StringRef()); 2724 2725 return false; 2726} 2727 2728/// parseDirectiveStabs 2729/// ::= .stabs string, number, number, number 2730bool AsmParser::parseDirectiveStabs() { 2731 return TokError("unsupported directive '.stabs'"); 2732} 2733 2734/// parseDirectiveCFISections 2735/// ::= .cfi_sections section [, section] 2736bool AsmParser::parseDirectiveCFISections() { 2737 StringRef Name; 2738 bool EH = false; 2739 bool Debug = false; 2740 2741 if (parseIdentifier(Name)) 2742 return TokError("Expected an identifier"); 2743 2744 if (Name == ".eh_frame") 2745 EH = true; 2746 else if (Name == ".debug_frame") 2747 Debug = true; 2748 2749 if (getLexer().is(AsmToken::Comma)) { 2750 Lex(); 2751 2752 if (parseIdentifier(Name)) 2753 return TokError("Expected an identifier"); 2754 2755 if (Name == ".eh_frame") 2756 EH = true; 2757 else if (Name == ".debug_frame") 2758 Debug = true; 2759 } 2760 2761 getStreamer().EmitCFISections(EH, Debug); 2762 return false; 2763} 2764 2765/// parseDirectiveCFIStartProc 2766/// ::= .cfi_startproc 2767bool AsmParser::parseDirectiveCFIStartProc() { 2768 getStreamer().EmitCFIStartProc(); 2769 return false; 2770} 2771 2772/// parseDirectiveCFIEndProc 2773/// ::= .cfi_endproc 2774bool AsmParser::parseDirectiveCFIEndProc() { 2775 getStreamer().EmitCFIEndProc(); 2776 return false; 2777} 2778 2779/// \brief parse register name or number. 2780bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register, 2781 SMLoc DirectiveLoc) { 2782 unsigned RegNo; 2783 2784 if (getLexer().isNot(AsmToken::Integer)) { 2785 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc)) 2786 return true; 2787 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true); 2788 } else 2789 return parseAbsoluteExpression(Register); 2790 2791 return false; 2792} 2793 2794/// parseDirectiveCFIDefCfa 2795/// ::= .cfi_def_cfa register, offset 2796bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) { 2797 int64_t Register = 0; 2798 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2799 return true; 2800 2801 if (getLexer().isNot(AsmToken::Comma)) 2802 return TokError("unexpected token in directive"); 2803 Lex(); 2804 2805 int64_t Offset = 0; 2806 if (parseAbsoluteExpression(Offset)) 2807 return true; 2808 2809 getStreamer().EmitCFIDefCfa(Register, Offset); 2810 return false; 2811} 2812 2813/// parseDirectiveCFIDefCfaOffset 2814/// ::= .cfi_def_cfa_offset offset 2815bool AsmParser::parseDirectiveCFIDefCfaOffset() { 2816 int64_t Offset = 0; 2817 if (parseAbsoluteExpression(Offset)) 2818 return true; 2819 2820 getStreamer().EmitCFIDefCfaOffset(Offset); 2821 return false; 2822} 2823 2824/// parseDirectiveCFIRegister 2825/// ::= .cfi_register register, register 2826bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) { 2827 int64_t Register1 = 0; 2828 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc)) 2829 return true; 2830 2831 if (getLexer().isNot(AsmToken::Comma)) 2832 return TokError("unexpected token in directive"); 2833 Lex(); 2834 2835 int64_t Register2 = 0; 2836 if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc)) 2837 return true; 2838 2839 getStreamer().EmitCFIRegister(Register1, Register2); 2840 return false; 2841} 2842 2843/// parseDirectiveCFIWindowSave 2844/// ::= .cfi_window_save 2845bool AsmParser::parseDirectiveCFIWindowSave() { 2846 getStreamer().EmitCFIWindowSave(); 2847 return false; 2848} 2849 2850/// parseDirectiveCFIAdjustCfaOffset 2851/// ::= .cfi_adjust_cfa_offset adjustment 2852bool AsmParser::parseDirectiveCFIAdjustCfaOffset() { 2853 int64_t Adjustment = 0; 2854 if (parseAbsoluteExpression(Adjustment)) 2855 return true; 2856 2857 getStreamer().EmitCFIAdjustCfaOffset(Adjustment); 2858 return false; 2859} 2860 2861/// parseDirectiveCFIDefCfaRegister 2862/// ::= .cfi_def_cfa_register register 2863bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) { 2864 int64_t Register = 0; 2865 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2866 return true; 2867 2868 getStreamer().EmitCFIDefCfaRegister(Register); 2869 return false; 2870} 2871 2872/// parseDirectiveCFIOffset 2873/// ::= .cfi_offset register, offset 2874bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) { 2875 int64_t Register = 0; 2876 int64_t Offset = 0; 2877 2878 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2879 return true; 2880 2881 if (getLexer().isNot(AsmToken::Comma)) 2882 return TokError("unexpected token in directive"); 2883 Lex(); 2884 2885 if (parseAbsoluteExpression(Offset)) 2886 return true; 2887 2888 getStreamer().EmitCFIOffset(Register, Offset); 2889 return false; 2890} 2891 2892/// parseDirectiveCFIRelOffset 2893/// ::= .cfi_rel_offset register, offset 2894bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) { 2895 int64_t Register = 0; 2896 2897 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2898 return true; 2899 2900 if (getLexer().isNot(AsmToken::Comma)) 2901 return TokError("unexpected token in directive"); 2902 Lex(); 2903 2904 int64_t Offset = 0; 2905 if (parseAbsoluteExpression(Offset)) 2906 return true; 2907 2908 getStreamer().EmitCFIRelOffset(Register, Offset); 2909 return false; 2910} 2911 2912static bool isValidEncoding(int64_t Encoding) { 2913 if (Encoding & ~0xff) 2914 return false; 2915 2916 if (Encoding == dwarf::DW_EH_PE_omit) 2917 return true; 2918 2919 const unsigned Format = Encoding & 0xf; 2920 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && 2921 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && 2922 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && 2923 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) 2924 return false; 2925 2926 const unsigned Application = Encoding & 0x70; 2927 if (Application != dwarf::DW_EH_PE_absptr && 2928 Application != dwarf::DW_EH_PE_pcrel) 2929 return false; 2930 2931 return true; 2932} 2933 2934/// parseDirectiveCFIPersonalityOrLsda 2935/// IsPersonality true for cfi_personality, false for cfi_lsda 2936/// ::= .cfi_personality encoding, [symbol_name] 2937/// ::= .cfi_lsda encoding, [symbol_name] 2938bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) { 2939 int64_t Encoding = 0; 2940 if (parseAbsoluteExpression(Encoding)) 2941 return true; 2942 if (Encoding == dwarf::DW_EH_PE_omit) 2943 return false; 2944 2945 if (!isValidEncoding(Encoding)) 2946 return TokError("unsupported encoding."); 2947 2948 if (getLexer().isNot(AsmToken::Comma)) 2949 return TokError("unexpected token in directive"); 2950 Lex(); 2951 2952 StringRef Name; 2953 if (parseIdentifier(Name)) 2954 return TokError("expected identifier in directive"); 2955 2956 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 2957 2958 if (IsPersonality) 2959 getStreamer().EmitCFIPersonality(Sym, Encoding); 2960 else 2961 getStreamer().EmitCFILsda(Sym, Encoding); 2962 return false; 2963} 2964 2965/// parseDirectiveCFIRememberState 2966/// ::= .cfi_remember_state 2967bool AsmParser::parseDirectiveCFIRememberState() { 2968 getStreamer().EmitCFIRememberState(); 2969 return false; 2970} 2971 2972/// parseDirectiveCFIRestoreState 2973/// ::= .cfi_remember_state 2974bool AsmParser::parseDirectiveCFIRestoreState() { 2975 getStreamer().EmitCFIRestoreState(); 2976 return false; 2977} 2978 2979/// parseDirectiveCFISameValue 2980/// ::= .cfi_same_value register 2981bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) { 2982 int64_t Register = 0; 2983 2984 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2985 return true; 2986 2987 getStreamer().EmitCFISameValue(Register); 2988 return false; 2989} 2990 2991/// parseDirectiveCFIRestore 2992/// ::= .cfi_restore register 2993bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) { 2994 int64_t Register = 0; 2995 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2996 return true; 2997 2998 getStreamer().EmitCFIRestore(Register); 2999 return false; 3000} 3001 3002/// parseDirectiveCFIEscape 3003/// ::= .cfi_escape expression[,...] 3004bool AsmParser::parseDirectiveCFIEscape() { 3005 std::string Values; 3006 int64_t CurrValue; 3007 if (parseAbsoluteExpression(CurrValue)) 3008 return true; 3009 3010 Values.push_back((uint8_t)CurrValue); 3011 3012 while (getLexer().is(AsmToken::Comma)) { 3013 Lex(); 3014 3015 if (parseAbsoluteExpression(CurrValue)) 3016 return true; 3017 3018 Values.push_back((uint8_t)CurrValue); 3019 } 3020 3021 getStreamer().EmitCFIEscape(Values); 3022 return false; 3023} 3024 3025/// parseDirectiveCFISignalFrame 3026/// ::= .cfi_signal_frame 3027bool AsmParser::parseDirectiveCFISignalFrame() { 3028 if (getLexer().isNot(AsmToken::EndOfStatement)) 3029 return Error(getLexer().getLoc(), 3030 "unexpected token in '.cfi_signal_frame'"); 3031 3032 getStreamer().EmitCFISignalFrame(); 3033 return false; 3034} 3035 3036/// parseDirectiveCFIUndefined 3037/// ::= .cfi_undefined register 3038bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) { 3039 int64_t Register = 0; 3040 3041 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3042 return true; 3043 3044 getStreamer().EmitCFIUndefined(Register); 3045 return false; 3046} 3047 3048/// parseDirectiveMacrosOnOff 3049/// ::= .macros_on 3050/// ::= .macros_off 3051bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) { 3052 if (getLexer().isNot(AsmToken::EndOfStatement)) 3053 return Error(getLexer().getLoc(), 3054 "unexpected token in '" + Directive + "' directive"); 3055 3056 setMacrosEnabled(Directive == ".macros_on"); 3057 return false; 3058} 3059 3060/// parseDirectiveMacro 3061/// ::= .macro name [parameters] 3062bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) { 3063 StringRef Name; 3064 if (parseIdentifier(Name)) 3065 return TokError("expected identifier in '.macro' directive"); 3066 3067 MCAsmMacroParameters Parameters; 3068 // Argument delimiter is initially unknown. It will be set by 3069 // parseMacroArgument() 3070 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof; 3071 if (getLexer().isNot(AsmToken::EndOfStatement)) { 3072 for (;;) { 3073 MCAsmMacroParameter Parameter; 3074 if (parseIdentifier(Parameter.first)) 3075 return TokError("expected identifier in '.macro' directive"); 3076 3077 if (getLexer().is(AsmToken::Equal)) { 3078 Lex(); 3079 if (parseMacroArgument(Parameter.second, ArgumentDelimiter)) 3080 return true; 3081 } 3082 3083 Parameters.push_back(Parameter); 3084 3085 if (getLexer().is(AsmToken::Comma)) 3086 Lex(); 3087 else if (getLexer().is(AsmToken::EndOfStatement)) 3088 break; 3089 } 3090 } 3091 3092 // Eat the end of statement. 3093 Lex(); 3094 3095 AsmToken EndToken, StartToken = getTok(); 3096 3097 // Lex the macro definition. 3098 for (;;) { 3099 // Check whether we have reached the end of the file. 3100 if (getLexer().is(AsmToken::Eof)) 3101 return Error(DirectiveLoc, "no matching '.endmacro' in definition"); 3102 3103 // Otherwise, check whether we have reach the .endmacro. 3104 if (getLexer().is(AsmToken::Identifier) && 3105 (getTok().getIdentifier() == ".endm" || 3106 getTok().getIdentifier() == ".endmacro")) { 3107 EndToken = getTok(); 3108 Lex(); 3109 if (getLexer().isNot(AsmToken::EndOfStatement)) 3110 return TokError("unexpected token in '" + EndToken.getIdentifier() + 3111 "' directive"); 3112 break; 3113 } 3114 3115 // Otherwise, scan til the end of the statement. 3116 eatToEndOfStatement(); 3117 } 3118 3119 if (lookupMacro(Name)) { 3120 return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); 3121 } 3122 3123 const char *BodyStart = StartToken.getLoc().getPointer(); 3124 const char *BodyEnd = EndToken.getLoc().getPointer(); 3125 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 3126 checkForBadMacro(DirectiveLoc, Name, Body, Parameters); 3127 defineMacro(Name, MCAsmMacro(Name, Body, Parameters)); 3128 return false; 3129} 3130 3131/// checkForBadMacro 3132/// 3133/// With the support added for named parameters there may be code out there that 3134/// is transitioning from positional parameters. In versions of gas that did 3135/// not support named parameters they would be ignored on the macro defintion. 3136/// But to support both styles of parameters this is not possible so if a macro 3137/// defintion has named parameters but does not use them and has what appears 3138/// to be positional parameters, strings like $1, $2, ... and $n, then issue a 3139/// warning that the positional parameter found in body which have no effect. 3140/// Hoping the developer will either remove the named parameters from the macro 3141/// definiton so the positional parameters get used if that was what was 3142/// intended or change the macro to use the named parameters. It is possible 3143/// this warning will trigger when the none of the named parameters are used 3144/// and the strings like $1 are infact to simply to be passed trough unchanged. 3145void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, 3146 StringRef Body, 3147 MCAsmMacroParameters Parameters) { 3148 // If this macro is not defined with named parameters the warning we are 3149 // checking for here doesn't apply. 3150 unsigned NParameters = Parameters.size(); 3151 if (NParameters == 0) 3152 return; 3153 3154 bool NamedParametersFound = false; 3155 bool PositionalParametersFound = false; 3156 3157 // Look at the body of the macro for use of both the named parameters and what 3158 // are likely to be positional parameters. This is what expandMacro() is 3159 // doing when it finds the parameters in the body. 3160 while (!Body.empty()) { 3161 // Scan for the next possible parameter. 3162 std::size_t End = Body.size(), Pos = 0; 3163 for (; Pos != End; ++Pos) { 3164 // Check for a substitution or escape. 3165 // This macro is defined with parameters, look for \foo, \bar, etc. 3166 if (Body[Pos] == '\\' && Pos + 1 != End) 3167 break; 3168 3169 // This macro should have parameters, but look for $0, $1, ..., $n too. 3170 if (Body[Pos] != '$' || Pos + 1 == End) 3171 continue; 3172 char Next = Body[Pos + 1]; 3173 if (Next == '$' || Next == 'n' || 3174 isdigit(static_cast<unsigned char>(Next))) 3175 break; 3176 } 3177 3178 // Check if we reached the end. 3179 if (Pos == End) 3180 break; 3181 3182 if (Body[Pos] == '$') { 3183 switch (Body[Pos + 1]) { 3184 // $$ => $ 3185 case '$': 3186 break; 3187 3188 // $n => number of arguments 3189 case 'n': 3190 PositionalParametersFound = true; 3191 break; 3192 3193 // $[0-9] => argument 3194 default: { 3195 PositionalParametersFound = true; 3196 break; 3197 } 3198 } 3199 Pos += 2; 3200 } else { 3201 unsigned I = Pos + 1; 3202 while (isIdentifierChar(Body[I]) && I + 1 != End) 3203 ++I; 3204 3205 const char *Begin = Body.data() + Pos + 1; 3206 StringRef Argument(Begin, I - (Pos + 1)); 3207 unsigned Index = 0; 3208 for (; Index < NParameters; ++Index) 3209 if (Parameters[Index].first == Argument) 3210 break; 3211 3212 if (Index == NParameters) { 3213 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 3214 Pos += 3; 3215 else { 3216 Pos = I; 3217 } 3218 } else { 3219 NamedParametersFound = true; 3220 Pos += 1 + Argument.size(); 3221 } 3222 } 3223 // Update the scan point. 3224 Body = Body.substr(Pos); 3225 } 3226 3227 if (!NamedParametersFound && PositionalParametersFound) 3228 Warning(DirectiveLoc, "macro defined with named parameters which are not " 3229 "used in macro body, possible positional parameter " 3230 "found in body which will have no effect"); 3231} 3232 3233/// parseDirectiveEndMacro 3234/// ::= .endm 3235/// ::= .endmacro 3236bool AsmParser::parseDirectiveEndMacro(StringRef Directive) { 3237 if (getLexer().isNot(AsmToken::EndOfStatement)) 3238 return TokError("unexpected token in '" + Directive + "' directive"); 3239 3240 // If we are inside a macro instantiation, terminate the current 3241 // instantiation. 3242 if (isInsideMacroInstantiation()) { 3243 handleMacroExit(); 3244 return false; 3245 } 3246 3247 // Otherwise, this .endmacro is a stray entry in the file; well formed 3248 // .endmacro directives are handled during the macro definition parsing. 3249 return TokError("unexpected '" + Directive + "' in file, " 3250 "no current macro definition"); 3251} 3252 3253/// parseDirectivePurgeMacro 3254/// ::= .purgem 3255bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) { 3256 StringRef Name; 3257 if (parseIdentifier(Name)) 3258 return TokError("expected identifier in '.purgem' directive"); 3259 3260 if (getLexer().isNot(AsmToken::EndOfStatement)) 3261 return TokError("unexpected token in '.purgem' directive"); 3262 3263 if (!lookupMacro(Name)) 3264 return Error(DirectiveLoc, "macro '" + Name + "' is not defined"); 3265 3266 undefineMacro(Name); 3267 return false; 3268} 3269 3270/// parseDirectiveBundleAlignMode 3271/// ::= {.bundle_align_mode} expression 3272bool AsmParser::parseDirectiveBundleAlignMode() { 3273 checkForValidSection(); 3274 3275 // Expect a single argument: an expression that evaluates to a constant 3276 // in the inclusive range 0-30. 3277 SMLoc ExprLoc = getLexer().getLoc(); 3278 int64_t AlignSizePow2; 3279 if (parseAbsoluteExpression(AlignSizePow2)) 3280 return true; 3281 else if (getLexer().isNot(AsmToken::EndOfStatement)) 3282 return TokError("unexpected token after expression in" 3283 " '.bundle_align_mode' directive"); 3284 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30) 3285 return Error(ExprLoc, 3286 "invalid bundle alignment size (expected between 0 and 30)"); 3287 3288 Lex(); 3289 3290 // Because of AlignSizePow2's verified range we can safely truncate it to 3291 // unsigned. 3292 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2)); 3293 return false; 3294} 3295 3296/// parseDirectiveBundleLock 3297/// ::= {.bundle_lock} [align_to_end] 3298bool AsmParser::parseDirectiveBundleLock() { 3299 checkForValidSection(); 3300 bool AlignToEnd = false; 3301 3302 if (getLexer().isNot(AsmToken::EndOfStatement)) { 3303 StringRef Option; 3304 SMLoc Loc = getTok().getLoc(); 3305 const char *kInvalidOptionError = 3306 "invalid option for '.bundle_lock' directive"; 3307 3308 if (parseIdentifier(Option)) 3309 return Error(Loc, kInvalidOptionError); 3310 3311 if (Option != "align_to_end") 3312 return Error(Loc, kInvalidOptionError); 3313 else if (getLexer().isNot(AsmToken::EndOfStatement)) 3314 return Error(Loc, 3315 "unexpected token after '.bundle_lock' directive option"); 3316 AlignToEnd = true; 3317 } 3318 3319 Lex(); 3320 3321 getStreamer().EmitBundleLock(AlignToEnd); 3322 return false; 3323} 3324 3325/// parseDirectiveBundleLock 3326/// ::= {.bundle_lock} 3327bool AsmParser::parseDirectiveBundleUnlock() { 3328 checkForValidSection(); 3329 3330 if (getLexer().isNot(AsmToken::EndOfStatement)) 3331 return TokError("unexpected token in '.bundle_unlock' directive"); 3332 Lex(); 3333 3334 getStreamer().EmitBundleUnlock(); 3335 return false; 3336} 3337 3338/// parseDirectiveSpace 3339/// ::= (.skip | .space) expression [ , expression ] 3340bool AsmParser::parseDirectiveSpace(StringRef IDVal) { 3341 checkForValidSection(); 3342 3343 int64_t NumBytes; 3344 if (parseAbsoluteExpression(NumBytes)) 3345 return true; 3346 3347 int64_t FillExpr = 0; 3348 if (getLexer().isNot(AsmToken::EndOfStatement)) { 3349 if (getLexer().isNot(AsmToken::Comma)) 3350 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 3351 Lex(); 3352 3353 if (parseAbsoluteExpression(FillExpr)) 3354 return true; 3355 3356 if (getLexer().isNot(AsmToken::EndOfStatement)) 3357 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 3358 } 3359 3360 Lex(); 3361 3362 if (NumBytes <= 0) 3363 return TokError("invalid number of bytes in '" + Twine(IDVal) + 3364 "' directive"); 3365 3366 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. 3367 getStreamer().EmitFill(NumBytes, FillExpr); 3368 3369 return false; 3370} 3371 3372/// parseDirectiveLEB128 3373/// ::= (.sleb128 | .uleb128) expression 3374bool AsmParser::parseDirectiveLEB128(bool Signed) { 3375 checkForValidSection(); 3376 const MCExpr *Value; 3377 3378 if (parseExpression(Value)) 3379 return true; 3380 3381 if (getLexer().isNot(AsmToken::EndOfStatement)) 3382 return TokError("unexpected token in directive"); 3383 3384 if (Signed) 3385 getStreamer().EmitSLEB128Value(Value); 3386 else 3387 getStreamer().EmitULEB128Value(Value); 3388 3389 return false; 3390} 3391 3392/// parseDirectiveSymbolAttribute 3393/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] 3394bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) { 3395 if (getLexer().isNot(AsmToken::EndOfStatement)) { 3396 for (;;) { 3397 StringRef Name; 3398 SMLoc Loc = getTok().getLoc(); 3399 3400 if (parseIdentifier(Name)) 3401 return Error(Loc, "expected identifier in directive"); 3402 3403 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 3404 3405 // Assembler local symbols don't make any sense here. Complain loudly. 3406 if (Sym->isTemporary()) 3407 return Error(Loc, "non-local symbol required in directive"); 3408 3409 if (!getStreamer().EmitSymbolAttribute(Sym, Attr)) 3410 return Error(Loc, "unable to emit symbol attribute"); 3411 3412 if (getLexer().is(AsmToken::EndOfStatement)) 3413 break; 3414 3415 if (getLexer().isNot(AsmToken::Comma)) 3416 return TokError("unexpected token in directive"); 3417 Lex(); 3418 } 3419 } 3420 3421 Lex(); 3422 return false; 3423} 3424 3425/// parseDirectiveComm 3426/// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] 3427bool AsmParser::parseDirectiveComm(bool IsLocal) { 3428 checkForValidSection(); 3429 3430 SMLoc IDLoc = getLexer().getLoc(); 3431 StringRef Name; 3432 if (parseIdentifier(Name)) 3433 return TokError("expected identifier in directive"); 3434 3435 // Handle the identifier as the key symbol. 3436 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 3437 3438 if (getLexer().isNot(AsmToken::Comma)) 3439 return TokError("unexpected token in directive"); 3440 Lex(); 3441 3442 int64_t Size; 3443 SMLoc SizeLoc = getLexer().getLoc(); 3444 if (parseAbsoluteExpression(Size)) 3445 return true; 3446 3447 int64_t Pow2Alignment = 0; 3448 SMLoc Pow2AlignmentLoc; 3449 if (getLexer().is(AsmToken::Comma)) { 3450 Lex(); 3451 Pow2AlignmentLoc = getLexer().getLoc(); 3452 if (parseAbsoluteExpression(Pow2Alignment)) 3453 return true; 3454 3455 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType(); 3456 if (IsLocal && LCOMM == LCOMM::NoAlignment) 3457 return Error(Pow2AlignmentLoc, "alignment not supported on this target"); 3458 3459 // If this target takes alignments in bytes (not log) validate and convert. 3460 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) || 3461 (IsLocal && LCOMM == LCOMM::ByteAlignment)) { 3462 if (!isPowerOf2_64(Pow2Alignment)) 3463 return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); 3464 Pow2Alignment = Log2_64(Pow2Alignment); 3465 } 3466 } 3467 3468 if (getLexer().isNot(AsmToken::EndOfStatement)) 3469 return TokError("unexpected token in '.comm' or '.lcomm' directive"); 3470 3471 Lex(); 3472 3473 // NOTE: a size of zero for a .comm should create a undefined symbol 3474 // but a size of .lcomm creates a bss symbol of size zero. 3475 if (Size < 0) 3476 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't " 3477 "be less than zero"); 3478 3479 // NOTE: The alignment in the directive is a power of 2 value, the assembler 3480 // may internally end up wanting an alignment in bytes. 3481 // FIXME: Diagnose overflow. 3482 if (Pow2Alignment < 0) 3483 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive " 3484 "alignment, can't be less than zero"); 3485 3486 if (!Sym->isUndefined()) 3487 return Error(IDLoc, "invalid symbol redefinition"); 3488 3489 // Create the Symbol as a common or local common with Size and Pow2Alignment 3490 if (IsLocal) { 3491 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment); 3492 return false; 3493 } 3494 3495 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment); 3496 return false; 3497} 3498 3499/// parseDirectiveAbort 3500/// ::= .abort [... message ...] 3501bool AsmParser::parseDirectiveAbort() { 3502 // FIXME: Use loc from directive. 3503 SMLoc Loc = getLexer().getLoc(); 3504 3505 StringRef Str = parseStringToEndOfStatement(); 3506 if (getLexer().isNot(AsmToken::EndOfStatement)) 3507 return TokError("unexpected token in '.abort' directive"); 3508 3509 Lex(); 3510 3511 if (Str.empty()) 3512 Error(Loc, ".abort detected. Assembly stopping."); 3513 else 3514 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping."); 3515 // FIXME: Actually abort assembly here. 3516 3517 return false; 3518} 3519 3520/// parseDirectiveInclude 3521/// ::= .include "filename" 3522bool AsmParser::parseDirectiveInclude() { 3523 if (getLexer().isNot(AsmToken::String)) 3524 return TokError("expected string in '.include' directive"); 3525 3526 // Allow the strings to have escaped octal character sequence. 3527 std::string Filename; 3528 if (parseEscapedString(Filename)) 3529 return true; 3530 SMLoc IncludeLoc = getLexer().getLoc(); 3531 Lex(); 3532 3533 if (getLexer().isNot(AsmToken::EndOfStatement)) 3534 return TokError("unexpected token in '.include' directive"); 3535 3536 // Attempt to switch the lexer to the included file before consuming the end 3537 // of statement to avoid losing it when we switch. 3538 if (enterIncludeFile(Filename)) { 3539 Error(IncludeLoc, "Could not find include file '" + Filename + "'"); 3540 return true; 3541 } 3542 3543 return false; 3544} 3545 3546/// parseDirectiveIncbin 3547/// ::= .incbin "filename" 3548bool AsmParser::parseDirectiveIncbin() { 3549 if (getLexer().isNot(AsmToken::String)) 3550 return TokError("expected string in '.incbin' directive"); 3551 3552 // Allow the strings to have escaped octal character sequence. 3553 std::string Filename; 3554 if (parseEscapedString(Filename)) 3555 return true; 3556 SMLoc IncbinLoc = getLexer().getLoc(); 3557 Lex(); 3558 3559 if (getLexer().isNot(AsmToken::EndOfStatement)) 3560 return TokError("unexpected token in '.incbin' directive"); 3561 3562 // Attempt to process the included file. 3563 if (processIncbinFile(Filename)) { 3564 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); 3565 return true; 3566 } 3567 3568 return false; 3569} 3570 3571/// parseDirectiveIf 3572/// ::= .if expression 3573bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc) { 3574 TheCondStack.push_back(TheCondState); 3575 TheCondState.TheCond = AsmCond::IfCond; 3576 if (TheCondState.Ignore) { 3577 eatToEndOfStatement(); 3578 } else { 3579 int64_t ExprValue; 3580 if (parseAbsoluteExpression(ExprValue)) 3581 return true; 3582 3583 if (getLexer().isNot(AsmToken::EndOfStatement)) 3584 return TokError("unexpected token in '.if' directive"); 3585 3586 Lex(); 3587 3588 TheCondState.CondMet = ExprValue; 3589 TheCondState.Ignore = !TheCondState.CondMet; 3590 } 3591 3592 return false; 3593} 3594 3595/// parseDirectiveIfb 3596/// ::= .ifb string 3597bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) { 3598 TheCondStack.push_back(TheCondState); 3599 TheCondState.TheCond = AsmCond::IfCond; 3600 3601 if (TheCondState.Ignore) { 3602 eatToEndOfStatement(); 3603 } else { 3604 StringRef Str = parseStringToEndOfStatement(); 3605 3606 if (getLexer().isNot(AsmToken::EndOfStatement)) 3607 return TokError("unexpected token in '.ifb' directive"); 3608 3609 Lex(); 3610 3611 TheCondState.CondMet = ExpectBlank == Str.empty(); 3612 TheCondState.Ignore = !TheCondState.CondMet; 3613 } 3614 3615 return false; 3616} 3617 3618/// parseDirectiveIfc 3619/// ::= .ifc string1, string2 3620bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) { 3621 TheCondStack.push_back(TheCondState); 3622 TheCondState.TheCond = AsmCond::IfCond; 3623 3624 if (TheCondState.Ignore) { 3625 eatToEndOfStatement(); 3626 } else { 3627 StringRef Str1 = parseStringToComma(); 3628 3629 if (getLexer().isNot(AsmToken::Comma)) 3630 return TokError("unexpected token in '.ifc' directive"); 3631 3632 Lex(); 3633 3634 StringRef Str2 = parseStringToEndOfStatement(); 3635 3636 if (getLexer().isNot(AsmToken::EndOfStatement)) 3637 return TokError("unexpected token in '.ifc' directive"); 3638 3639 Lex(); 3640 3641 TheCondState.CondMet = ExpectEqual == (Str1 == Str2); 3642 TheCondState.Ignore = !TheCondState.CondMet; 3643 } 3644 3645 return false; 3646} 3647 3648/// parseDirectiveIfdef 3649/// ::= .ifdef symbol 3650bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { 3651 StringRef Name; 3652 TheCondStack.push_back(TheCondState); 3653 TheCondState.TheCond = AsmCond::IfCond; 3654 3655 if (TheCondState.Ignore) { 3656 eatToEndOfStatement(); 3657 } else { 3658 if (parseIdentifier(Name)) 3659 return TokError("expected identifier after '.ifdef'"); 3660 3661 Lex(); 3662 3663 MCSymbol *Sym = getContext().LookupSymbol(Name); 3664 3665 if (expect_defined) 3666 TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined()); 3667 else 3668 TheCondState.CondMet = (Sym == NULL || Sym->isUndefined()); 3669 TheCondState.Ignore = !TheCondState.CondMet; 3670 } 3671 3672 return false; 3673} 3674 3675/// parseDirectiveElseIf 3676/// ::= .elseif expression 3677bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) { 3678 if (TheCondState.TheCond != AsmCond::IfCond && 3679 TheCondState.TheCond != AsmCond::ElseIfCond) 3680 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or " 3681 " an .elseif"); 3682 TheCondState.TheCond = AsmCond::ElseIfCond; 3683 3684 bool LastIgnoreState = false; 3685 if (!TheCondStack.empty()) 3686 LastIgnoreState = TheCondStack.back().Ignore; 3687 if (LastIgnoreState || TheCondState.CondMet) { 3688 TheCondState.Ignore = true; 3689 eatToEndOfStatement(); 3690 } else { 3691 int64_t ExprValue; 3692 if (parseAbsoluteExpression(ExprValue)) 3693 return true; 3694 3695 if (getLexer().isNot(AsmToken::EndOfStatement)) 3696 return TokError("unexpected token in '.elseif' directive"); 3697 3698 Lex(); 3699 TheCondState.CondMet = ExprValue; 3700 TheCondState.Ignore = !TheCondState.CondMet; 3701 } 3702 3703 return false; 3704} 3705 3706/// parseDirectiveElse 3707/// ::= .else 3708bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) { 3709 if (getLexer().isNot(AsmToken::EndOfStatement)) 3710 return TokError("unexpected token in '.else' directive"); 3711 3712 Lex(); 3713 3714 if (TheCondState.TheCond != AsmCond::IfCond && 3715 TheCondState.TheCond != AsmCond::ElseIfCond) 3716 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an " 3717 ".elseif"); 3718 TheCondState.TheCond = AsmCond::ElseCond; 3719 bool LastIgnoreState = false; 3720 if (!TheCondStack.empty()) 3721 LastIgnoreState = TheCondStack.back().Ignore; 3722 if (LastIgnoreState || TheCondState.CondMet) 3723 TheCondState.Ignore = true; 3724 else 3725 TheCondState.Ignore = false; 3726 3727 return false; 3728} 3729 3730/// parseDirectiveEndIf 3731/// ::= .endif 3732bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) { 3733 if (getLexer().isNot(AsmToken::EndOfStatement)) 3734 return TokError("unexpected token in '.endif' directive"); 3735 3736 Lex(); 3737 3738 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty()) 3739 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or " 3740 ".else"); 3741 if (!TheCondStack.empty()) { 3742 TheCondState = TheCondStack.back(); 3743 TheCondStack.pop_back(); 3744 } 3745 3746 return false; 3747} 3748 3749void AsmParser::initializeDirectiveKindMap() { 3750 DirectiveKindMap[".set"] = DK_SET; 3751 DirectiveKindMap[".equ"] = DK_EQU; 3752 DirectiveKindMap[".equiv"] = DK_EQUIV; 3753 DirectiveKindMap[".ascii"] = DK_ASCII; 3754 DirectiveKindMap[".asciz"] = DK_ASCIZ; 3755 DirectiveKindMap[".string"] = DK_STRING; 3756 DirectiveKindMap[".byte"] = DK_BYTE; 3757 DirectiveKindMap[".short"] = DK_SHORT; 3758 DirectiveKindMap[".value"] = DK_VALUE; 3759 DirectiveKindMap[".2byte"] = DK_2BYTE; 3760 DirectiveKindMap[".long"] = DK_LONG; 3761 DirectiveKindMap[".int"] = DK_INT; 3762 DirectiveKindMap[".4byte"] = DK_4BYTE; 3763 DirectiveKindMap[".quad"] = DK_QUAD; 3764 DirectiveKindMap[".8byte"] = DK_8BYTE; 3765 DirectiveKindMap[".single"] = DK_SINGLE; 3766 DirectiveKindMap[".float"] = DK_FLOAT; 3767 DirectiveKindMap[".double"] = DK_DOUBLE; 3768 DirectiveKindMap[".align"] = DK_ALIGN; 3769 DirectiveKindMap[".align32"] = DK_ALIGN32; 3770 DirectiveKindMap[".balign"] = DK_BALIGN; 3771 DirectiveKindMap[".balignw"] = DK_BALIGNW; 3772 DirectiveKindMap[".balignl"] = DK_BALIGNL; 3773 DirectiveKindMap[".p2align"] = DK_P2ALIGN; 3774 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW; 3775 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL; 3776 DirectiveKindMap[".org"] = DK_ORG; 3777 DirectiveKindMap[".fill"] = DK_FILL; 3778 DirectiveKindMap[".zero"] = DK_ZERO; 3779 DirectiveKindMap[".extern"] = DK_EXTERN; 3780 DirectiveKindMap[".globl"] = DK_GLOBL; 3781 DirectiveKindMap[".global"] = DK_GLOBAL; 3782 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE; 3783 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP; 3784 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER; 3785 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN; 3786 DirectiveKindMap[".reference"] = DK_REFERENCE; 3787 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION; 3788 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE; 3789 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN; 3790 DirectiveKindMap[".comm"] = DK_COMM; 3791 DirectiveKindMap[".common"] = DK_COMMON; 3792 DirectiveKindMap[".lcomm"] = DK_LCOMM; 3793 DirectiveKindMap[".abort"] = DK_ABORT; 3794 DirectiveKindMap[".include"] = DK_INCLUDE; 3795 DirectiveKindMap[".incbin"] = DK_INCBIN; 3796 DirectiveKindMap[".code16"] = DK_CODE16; 3797 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC; 3798 DirectiveKindMap[".rept"] = DK_REPT; 3799 DirectiveKindMap[".irp"] = DK_IRP; 3800 DirectiveKindMap[".irpc"] = DK_IRPC; 3801 DirectiveKindMap[".endr"] = DK_ENDR; 3802 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE; 3803 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK; 3804 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK; 3805 DirectiveKindMap[".if"] = DK_IF; 3806 DirectiveKindMap[".ifb"] = DK_IFB; 3807 DirectiveKindMap[".ifnb"] = DK_IFNB; 3808 DirectiveKindMap[".ifc"] = DK_IFC; 3809 DirectiveKindMap[".ifnc"] = DK_IFNC; 3810 DirectiveKindMap[".ifdef"] = DK_IFDEF; 3811 DirectiveKindMap[".ifndef"] = DK_IFNDEF; 3812 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF; 3813 DirectiveKindMap[".elseif"] = DK_ELSEIF; 3814 DirectiveKindMap[".else"] = DK_ELSE; 3815 DirectiveKindMap[".endif"] = DK_ENDIF; 3816 DirectiveKindMap[".skip"] = DK_SKIP; 3817 DirectiveKindMap[".space"] = DK_SPACE; 3818 DirectiveKindMap[".file"] = DK_FILE; 3819 DirectiveKindMap[".line"] = DK_LINE; 3820 DirectiveKindMap[".loc"] = DK_LOC; 3821 DirectiveKindMap[".stabs"] = DK_STABS; 3822 DirectiveKindMap[".sleb128"] = DK_SLEB128; 3823 DirectiveKindMap[".uleb128"] = DK_ULEB128; 3824 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS; 3825 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC; 3826 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC; 3827 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA; 3828 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET; 3829 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET; 3830 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER; 3831 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET; 3832 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET; 3833 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY; 3834 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA; 3835 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE; 3836 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE; 3837 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE; 3838 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE; 3839 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE; 3840 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME; 3841 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED; 3842 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER; 3843 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE; 3844 DirectiveKindMap[".macros_on"] = DK_MACROS_ON; 3845 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF; 3846 DirectiveKindMap[".macro"] = DK_MACRO; 3847 DirectiveKindMap[".endm"] = DK_ENDM; 3848 DirectiveKindMap[".endmacro"] = DK_ENDMACRO; 3849 DirectiveKindMap[".purgem"] = DK_PURGEM; 3850} 3851 3852MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) { 3853 AsmToken EndToken, StartToken = getTok(); 3854 3855 unsigned NestLevel = 0; 3856 for (;;) { 3857 // Check whether we have reached the end of the file. 3858 if (getLexer().is(AsmToken::Eof)) { 3859 Error(DirectiveLoc, "no matching '.endr' in definition"); 3860 return 0; 3861 } 3862 3863 if (Lexer.is(AsmToken::Identifier) && 3864 (getTok().getIdentifier() == ".rept")) { 3865 ++NestLevel; 3866 } 3867 3868 // Otherwise, check whether we have reached the .endr. 3869 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") { 3870 if (NestLevel == 0) { 3871 EndToken = getTok(); 3872 Lex(); 3873 if (Lexer.isNot(AsmToken::EndOfStatement)) { 3874 TokError("unexpected token in '.endr' directive"); 3875 return 0; 3876 } 3877 break; 3878 } 3879 --NestLevel; 3880 } 3881 3882 // Otherwise, scan till the end of the statement. 3883 eatToEndOfStatement(); 3884 } 3885 3886 const char *BodyStart = StartToken.getLoc().getPointer(); 3887 const char *BodyEnd = EndToken.getLoc().getPointer(); 3888 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 3889 3890 // We Are Anonymous. 3891 StringRef Name; 3892 MCAsmMacroParameters Parameters; 3893 MacroLikeBodies.push_back(MCAsmMacro(Name, Body, Parameters)); 3894 return &MacroLikeBodies.back(); 3895} 3896 3897void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 3898 raw_svector_ostream &OS) { 3899 OS << ".endr\n"; 3900 3901 MemoryBuffer *Instantiation = 3902 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 3903 3904 // Create the macro instantiation object and add to the current macro 3905 // instantiation stack. 3906 MacroInstantiation *MI = new MacroInstantiation( 3907 M, DirectiveLoc, CurBuffer, getTok().getLoc(), Instantiation); 3908 ActiveMacros.push_back(MI); 3909 3910 // Jump to the macro instantiation and prime the lexer. 3911 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc()); 3912 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 3913 Lex(); 3914} 3915 3916bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc) { 3917 int64_t Count; 3918 if (parseAbsoluteExpression(Count)) 3919 return TokError("unexpected token in '.rept' directive"); 3920 3921 if (Count < 0) 3922 return TokError("Count is negative"); 3923 3924 if (Lexer.isNot(AsmToken::EndOfStatement)) 3925 return TokError("unexpected token in '.rept' directive"); 3926 3927 // Eat the end of statement. 3928 Lex(); 3929 3930 // Lex the rept definition. 3931 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 3932 if (!M) 3933 return true; 3934 3935 // Macro instantiation is lexical, unfortunately. We construct a new buffer 3936 // to hold the macro body with substitutions. 3937 SmallString<256> Buf; 3938 MCAsmMacroParameters Parameters; 3939 MCAsmMacroArguments A; 3940 raw_svector_ostream OS(Buf); 3941 while (Count--) { 3942 if (expandMacro(OS, M->Body, Parameters, A, getTok().getLoc())) 3943 return true; 3944 } 3945 instantiateMacroLikeBody(M, DirectiveLoc, OS); 3946 3947 return false; 3948} 3949 3950/// parseDirectiveIrp 3951/// ::= .irp symbol,values 3952bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) { 3953 MCAsmMacroParameters Parameters; 3954 MCAsmMacroParameter Parameter; 3955 3956 if (parseIdentifier(Parameter.first)) 3957 return TokError("expected identifier in '.irp' directive"); 3958 3959 Parameters.push_back(Parameter); 3960 3961 if (Lexer.isNot(AsmToken::Comma)) 3962 return TokError("expected comma in '.irp' directive"); 3963 3964 Lex(); 3965 3966 MCAsmMacroArguments A; 3967 if (parseMacroArguments(0, A)) 3968 return true; 3969 3970 // Eat the end of statement. 3971 Lex(); 3972 3973 // Lex the irp definition. 3974 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 3975 if (!M) 3976 return true; 3977 3978 // Macro instantiation is lexical, unfortunately. We construct a new buffer 3979 // to hold the macro body with substitutions. 3980 SmallString<256> Buf; 3981 raw_svector_ostream OS(Buf); 3982 3983 for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) { 3984 MCAsmMacroArguments Args; 3985 Args.push_back(*i); 3986 3987 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc())) 3988 return true; 3989 } 3990 3991 instantiateMacroLikeBody(M, DirectiveLoc, OS); 3992 3993 return false; 3994} 3995 3996/// parseDirectiveIrpc 3997/// ::= .irpc symbol,values 3998bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) { 3999 MCAsmMacroParameters Parameters; 4000 MCAsmMacroParameter Parameter; 4001 4002 if (parseIdentifier(Parameter.first)) 4003 return TokError("expected identifier in '.irpc' directive"); 4004 4005 Parameters.push_back(Parameter); 4006 4007 if (Lexer.isNot(AsmToken::Comma)) 4008 return TokError("expected comma in '.irpc' directive"); 4009 4010 Lex(); 4011 4012 MCAsmMacroArguments A; 4013 if (parseMacroArguments(0, A)) 4014 return true; 4015 4016 if (A.size() != 1 || A.front().size() != 1) 4017 return TokError("unexpected token in '.irpc' directive"); 4018 4019 // Eat the end of statement. 4020 Lex(); 4021 4022 // Lex the irpc definition. 4023 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 4024 if (!M) 4025 return true; 4026 4027 // Macro instantiation is lexical, unfortunately. We construct a new buffer 4028 // to hold the macro body with substitutions. 4029 SmallString<256> Buf; 4030 raw_svector_ostream OS(Buf); 4031 4032 StringRef Values = A.front().front().getString(); 4033 std::size_t I, End = Values.size(); 4034 for (I = 0; I < End; ++I) { 4035 MCAsmMacroArgument Arg; 4036 Arg.push_back(AsmToken(AsmToken::Identifier, Values.slice(I, I + 1))); 4037 4038 MCAsmMacroArguments Args; 4039 Args.push_back(Arg); 4040 4041 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc())) 4042 return true; 4043 } 4044 4045 instantiateMacroLikeBody(M, DirectiveLoc, OS); 4046 4047 return false; 4048} 4049 4050bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) { 4051 if (ActiveMacros.empty()) 4052 return TokError("unmatched '.endr' directive"); 4053 4054 // The only .repl that should get here are the ones created by 4055 // instantiateMacroLikeBody. 4056 assert(getLexer().is(AsmToken::EndOfStatement)); 4057 4058 handleMacroExit(); 4059 return false; 4060} 4061 4062bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info, 4063 size_t Len) { 4064 const MCExpr *Value; 4065 SMLoc ExprLoc = getLexer().getLoc(); 4066 if (parseExpression(Value)) 4067 return true; 4068 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 4069 if (!MCE) 4070 return Error(ExprLoc, "unexpected expression in _emit"); 4071 uint64_t IntValue = MCE->getValue(); 4072 if (!isUIntN(8, IntValue) && !isIntN(8, IntValue)) 4073 return Error(ExprLoc, "literal value out of range for directive"); 4074 4075 Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, Len)); 4076 return false; 4077} 4078 4079bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) { 4080 const MCExpr *Value; 4081 SMLoc ExprLoc = getLexer().getLoc(); 4082 if (parseExpression(Value)) 4083 return true; 4084 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 4085 if (!MCE) 4086 return Error(ExprLoc, "unexpected expression in align"); 4087 uint64_t IntValue = MCE->getValue(); 4088 if (!isPowerOf2_64(IntValue)) 4089 return Error(ExprLoc, "literal value not a power of two greater then zero"); 4090 4091 Info.AsmRewrites->push_back( 4092 AsmRewrite(AOK_Align, IDLoc, 5, Log2_64(IntValue))); 4093 return false; 4094} 4095 4096// We are comparing pointers, but the pointers are relative to a single string. 4097// Thus, this should always be deterministic. 4098static int rewritesSort(const AsmRewrite *AsmRewriteA, 4099 const AsmRewrite *AsmRewriteB) { 4100 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer()) 4101 return -1; 4102 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer()) 4103 return 1; 4104 4105 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output 4106 // rewrite to the same location. Make sure the SizeDirective rewrite is 4107 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This 4108 // ensures the sort algorithm is stable. 4109 if (AsmRewritePrecedence[AsmRewriteA->Kind] > 4110 AsmRewritePrecedence[AsmRewriteB->Kind]) 4111 return -1; 4112 4113 if (AsmRewritePrecedence[AsmRewriteA->Kind] < 4114 AsmRewritePrecedence[AsmRewriteB->Kind]) 4115 return 1; 4116 llvm_unreachable("Unstable rewrite sort."); 4117} 4118 4119bool AsmParser::parseMSInlineAsm( 4120 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs, 4121 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls, 4122 SmallVectorImpl<std::string> &Constraints, 4123 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII, 4124 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) { 4125 SmallVector<void *, 4> InputDecls; 4126 SmallVector<void *, 4> OutputDecls; 4127 SmallVector<bool, 4> InputDeclsAddressOf; 4128 SmallVector<bool, 4> OutputDeclsAddressOf; 4129 SmallVector<std::string, 4> InputConstraints; 4130 SmallVector<std::string, 4> OutputConstraints; 4131 SmallVector<unsigned, 4> ClobberRegs; 4132 4133 SmallVector<AsmRewrite, 4> AsmStrRewrites; 4134 4135 // Prime the lexer. 4136 Lex(); 4137 4138 // While we have input, parse each statement. 4139 unsigned InputIdx = 0; 4140 unsigned OutputIdx = 0; 4141 while (getLexer().isNot(AsmToken::Eof)) { 4142 ParseStatementInfo Info(&AsmStrRewrites); 4143 if (parseStatement(Info)) 4144 return true; 4145 4146 if (Info.ParseError) 4147 return true; 4148 4149 if (Info.Opcode == ~0U) 4150 continue; 4151 4152 const MCInstrDesc &Desc = MII->get(Info.Opcode); 4153 4154 // Build the list of clobbers, outputs and inputs. 4155 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) { 4156 MCParsedAsmOperand *Operand = Info.ParsedOperands[i]; 4157 4158 // Immediate. 4159 if (Operand->isImm()) 4160 continue; 4161 4162 // Register operand. 4163 if (Operand->isReg() && !Operand->needAddressOf()) { 4164 unsigned NumDefs = Desc.getNumDefs(); 4165 // Clobber. 4166 if (NumDefs && Operand->getMCOperandNum() < NumDefs) 4167 ClobberRegs.push_back(Operand->getReg()); 4168 continue; 4169 } 4170 4171 // Expr/Input or Output. 4172 StringRef SymName = Operand->getSymName(); 4173 if (SymName.empty()) 4174 continue; 4175 4176 void *OpDecl = Operand->getOpDecl(); 4177 if (!OpDecl) 4178 continue; 4179 4180 bool isOutput = (i == 1) && Desc.mayStore(); 4181 SMLoc Start = SMLoc::getFromPointer(SymName.data()); 4182 if (isOutput) { 4183 ++InputIdx; 4184 OutputDecls.push_back(OpDecl); 4185 OutputDeclsAddressOf.push_back(Operand->needAddressOf()); 4186 OutputConstraints.push_back('=' + Operand->getConstraint().str()); 4187 AsmStrRewrites.push_back(AsmRewrite(AOK_Output, Start, SymName.size())); 4188 } else { 4189 InputDecls.push_back(OpDecl); 4190 InputDeclsAddressOf.push_back(Operand->needAddressOf()); 4191 InputConstraints.push_back(Operand->getConstraint().str()); 4192 AsmStrRewrites.push_back(AsmRewrite(AOK_Input, Start, SymName.size())); 4193 } 4194 } 4195 4196 // Consider implicit defs to be clobbers. Think of cpuid and push. 4197 const uint16_t *ImpDefs = Desc.getImplicitDefs(); 4198 for (unsigned I = 0, E = Desc.getNumImplicitDefs(); I != E; ++I) 4199 ClobberRegs.push_back(ImpDefs[I]); 4200 } 4201 4202 // Set the number of Outputs and Inputs. 4203 NumOutputs = OutputDecls.size(); 4204 NumInputs = InputDecls.size(); 4205 4206 // Set the unique clobbers. 4207 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end()); 4208 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()), 4209 ClobberRegs.end()); 4210 Clobbers.assign(ClobberRegs.size(), std::string()); 4211 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) { 4212 raw_string_ostream OS(Clobbers[I]); 4213 IP->printRegName(OS, ClobberRegs[I]); 4214 } 4215 4216 // Merge the various outputs and inputs. Output are expected first. 4217 if (NumOutputs || NumInputs) { 4218 unsigned NumExprs = NumOutputs + NumInputs; 4219 OpDecls.resize(NumExprs); 4220 Constraints.resize(NumExprs); 4221 for (unsigned i = 0; i < NumOutputs; ++i) { 4222 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]); 4223 Constraints[i] = OutputConstraints[i]; 4224 } 4225 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) { 4226 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]); 4227 Constraints[j] = InputConstraints[i]; 4228 } 4229 } 4230 4231 // Build the IR assembly string. 4232 std::string AsmStringIR; 4233 raw_string_ostream OS(AsmStringIR); 4234 const char *AsmStart = SrcMgr.getMemoryBuffer(0)->getBufferStart(); 4235 const char *AsmEnd = SrcMgr.getMemoryBuffer(0)->getBufferEnd(); 4236 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort); 4237 for (SmallVectorImpl<AsmRewrite>::iterator I = AsmStrRewrites.begin(), 4238 E = AsmStrRewrites.end(); 4239 I != E; ++I) { 4240 AsmRewriteKind Kind = (*I).Kind; 4241 if (Kind == AOK_Delete) 4242 continue; 4243 4244 const char *Loc = (*I).Loc.getPointer(); 4245 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!"); 4246 4247 // Emit everything up to the immediate/expression. 4248 unsigned Len = Loc - AsmStart; 4249 if (Len) 4250 OS << StringRef(AsmStart, Len); 4251 4252 // Skip the original expression. 4253 if (Kind == AOK_Skip) { 4254 AsmStart = Loc + (*I).Len; 4255 continue; 4256 } 4257 4258 unsigned AdditionalSkip = 0; 4259 // Rewrite expressions in $N notation. 4260 switch (Kind) { 4261 default: 4262 break; 4263 case AOK_Imm: 4264 OS << "$$" << (*I).Val; 4265 break; 4266 case AOK_ImmPrefix: 4267 OS << "$$"; 4268 break; 4269 case AOK_Input: 4270 OS << '$' << InputIdx++; 4271 break; 4272 case AOK_Output: 4273 OS << '$' << OutputIdx++; 4274 break; 4275 case AOK_SizeDirective: 4276 switch ((*I).Val) { 4277 default: break; 4278 case 8: OS << "byte ptr "; break; 4279 case 16: OS << "word ptr "; break; 4280 case 32: OS << "dword ptr "; break; 4281 case 64: OS << "qword ptr "; break; 4282 case 80: OS << "xword ptr "; break; 4283 case 128: OS << "xmmword ptr "; break; 4284 case 256: OS << "ymmword ptr "; break; 4285 } 4286 break; 4287 case AOK_Emit: 4288 OS << ".byte"; 4289 break; 4290 case AOK_Align: { 4291 unsigned Val = (*I).Val; 4292 OS << ".align " << Val; 4293 4294 // Skip the original immediate. 4295 assert(Val < 10 && "Expected alignment less then 2^10."); 4296 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4; 4297 break; 4298 } 4299 case AOK_DotOperator: 4300 // Insert the dot if the user omitted it. 4301 OS.flush(); 4302 if (AsmStringIR.at(AsmStringIR.size() - 1) != '.') 4303 OS << '.'; 4304 OS << (*I).Val; 4305 break; 4306 } 4307 4308 // Skip the original expression. 4309 AsmStart = Loc + (*I).Len + AdditionalSkip; 4310 } 4311 4312 // Emit the remainder of the asm string. 4313 if (AsmStart != AsmEnd) 4314 OS << StringRef(AsmStart, AsmEnd - AsmStart); 4315 4316 AsmString = OS.str(); 4317 return false; 4318} 4319 4320/// \brief Create an MCAsmParser instance. 4321MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C, 4322 MCStreamer &Out, const MCAsmInfo &MAI) { 4323 return new AsmParser(SM, C, Out, MAI); 4324} 4325