AsmParser.cpp revision 0143ac136847977bea1ba49f4f343feeabfc6a13
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/StringMap.h" 17#include "llvm/ADT/StringSwitch.h" 18#include "llvm/ADT/Twine.h" 19#include "llvm/MC/MCAsmInfo.h" 20#include "llvm/MC/MCContext.h" 21#include "llvm/MC/MCExpr.h" 22#include "llvm/MC/MCParser/AsmCond.h" 23#include "llvm/MC/MCParser/AsmLexer.h" 24#include "llvm/MC/MCParser/MCAsmParser.h" 25#include "llvm/MC/MCParser/MCParsedAsmOperand.h" 26#include "llvm/MC/MCSectionMachO.h" 27#include "llvm/MC/MCStreamer.h" 28#include "llvm/MC/MCSymbol.h" 29#include "llvm/MC/MCDwarf.h" 30#include "llvm/Support/MemoryBuffer.h" 31#include "llvm/Support/SourceMgr.h" 32#include "llvm/Support/raw_ostream.h" 33#include "llvm/Target/TargetAsmInfo.h" 34#include "llvm/Target/TargetAsmParser.h" 35#include <cctype> 36#include <vector> 37using namespace llvm; 38 39namespace { 40 41/// \brief Helper class for tracking macro definitions. 42struct Macro { 43 StringRef Name; 44 StringRef Body; 45 46public: 47 Macro(StringRef N, StringRef B) : Name(N), Body(B) {} 48}; 49 50/// \brief Helper class for storing information about an active macro 51/// instantiation. 52struct MacroInstantiation { 53 /// The macro being instantiated. 54 const Macro *TheMacro; 55 56 /// The macro instantiation with substitutions. 57 MemoryBuffer *Instantiation; 58 59 /// The location of the instantiation. 60 SMLoc InstantiationLoc; 61 62 /// The location where parsing should resume upon instantiation completion. 63 SMLoc ExitLoc; 64 65public: 66 MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL, 67 const std::vector<std::vector<AsmToken> > &A); 68}; 69 70/// \brief The concrete assembly parser instance. 71class AsmParser : public MCAsmParser { 72 friend class GenericAsmParser; 73 74 AsmParser(const AsmParser &); // DO NOT IMPLEMENT 75 void operator=(const AsmParser &); // DO NOT IMPLEMENT 76private: 77 AsmLexer Lexer; 78 MCContext &Ctx; 79 MCStreamer &Out; 80 SourceMgr &SrcMgr; 81 MCAsmParserExtension *GenericParser; 82 MCAsmParserExtension *PlatformParser; 83 84 /// This is the current buffer index we're lexing from as managed by the 85 /// SourceMgr object. 86 int CurBuffer; 87 88 AsmCond TheCondState; 89 std::vector<AsmCond> TheCondStack; 90 91 /// DirectiveMap - This is a table handlers for directives. Each handler is 92 /// invoked after the directive identifier is read and is responsible for 93 /// parsing and validating the rest of the directive. The handler is passed 94 /// in the directive name and the location of the directive keyword. 95 StringMap<std::pair<MCAsmParserExtension*, DirectiveHandler> > DirectiveMap; 96 97 /// MacroMap - Map of currently defined macros. 98 StringMap<Macro*> MacroMap; 99 100 /// ActiveMacros - Stack of active macro instantiations. 101 std::vector<MacroInstantiation*> ActiveMacros; 102 103 /// Boolean tracking whether macro substitution is enabled. 104 unsigned MacrosEnabled : 1; 105 106 /// Flag tracking whether any errors have been encountered. 107 unsigned HadError : 1; 108 109public: 110 AsmParser(const Target &T, SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 111 const MCAsmInfo &MAI); 112 ~AsmParser(); 113 114 virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false); 115 116 void AddDirectiveHandler(MCAsmParserExtension *Object, 117 StringRef Directive, 118 DirectiveHandler Handler) { 119 DirectiveMap[Directive] = std::make_pair(Object, Handler); 120 } 121 122public: 123 /// @name MCAsmParser Interface 124 /// { 125 126 virtual SourceMgr &getSourceManager() { return SrcMgr; } 127 virtual MCAsmLexer &getLexer() { return Lexer; } 128 virtual MCContext &getContext() { return Ctx; } 129 virtual MCStreamer &getStreamer() { return Out; } 130 131 virtual void Warning(SMLoc L, const Twine &Meg); 132 virtual bool Error(SMLoc L, const Twine &Msg); 133 134 const AsmToken &Lex(); 135 136 bool ParseExpression(const MCExpr *&Res); 137 virtual bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc); 138 virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc); 139 virtual bool ParseAbsoluteExpression(int64_t &Res); 140 141 /// } 142 143private: 144 void CheckForValidSection(); 145 146 bool ParseStatement(); 147 148 bool HandleMacroEntry(StringRef Name, SMLoc NameLoc, const Macro *M); 149 void HandleMacroExit(); 150 151 void PrintMacroInstantiations(); 152 void PrintMessage(SMLoc Loc, const Twine &Msg, const char *Type) const { 153 SrcMgr.PrintMessage(Loc, Msg, Type); 154 } 155 156 /// EnterIncludeFile - Enter the specified file. This returns true on failure. 157 bool EnterIncludeFile(const std::string &Filename); 158 159 /// \brief Reset the current lexer position to that given by \arg Loc. The 160 /// current token is not set; clients should ensure Lex() is called 161 /// subsequently. 162 void JumpToLoc(SMLoc Loc); 163 164 void EatToEndOfStatement(); 165 166 /// \brief Parse up to the end of statement and a return the contents from the 167 /// current token until the end of the statement; the current token on exit 168 /// will be either the EndOfStatement or EOF. 169 StringRef ParseStringToEndOfStatement(); 170 171 bool ParseAssignment(StringRef Name, bool allow_redef); 172 173 bool ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc); 174 bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); 175 bool ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); 176 bool ParseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); 177 178 /// ParseIdentifier - Parse an identifier or string (as a quoted identifier) 179 /// and set \arg Res to the identifier contents. 180 bool ParseIdentifier(StringRef &Res); 181 182 // Directive Parsing. 183 184 // ".ascii", ".asciiz", ".string" 185 bool ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); 186 bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ... 187 bool ParseDirectiveRealValue(const fltSemantics &); // ".single", ... 188 bool ParseDirectiveFill(); // ".fill" 189 bool ParseDirectiveSpace(); // ".space" 190 bool ParseDirectiveZero(); // ".zero" 191 bool ParseDirectiveSet(StringRef IDVal, bool allow_redef); // ".set", ".equ", ".equiv" 192 bool ParseDirectiveOrg(); // ".org" 193 // ".align{,32}", ".p2align{,w,l}" 194 bool ParseDirectiveAlign(bool IsPow2, unsigned ValueSize); 195 196 /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which 197 /// accepts a single symbol (which should be a label or an external). 198 bool ParseDirectiveSymbolAttribute(MCSymbolAttr Attr); 199 200 bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" 201 202 bool ParseDirectiveAbort(); // ".abort" 203 bool ParseDirectiveInclude(); // ".include" 204 205 bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if" 206 // ".ifdef" or ".ifndef", depending on expect_defined 207 bool ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); 208 bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" 209 bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else" 210 bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif 211 212 /// ParseEscapedString - Parse the current token as a string which may include 213 /// escaped characters and return the string contents. 214 bool ParseEscapedString(std::string &Data); 215 216 const MCExpr *ApplyModifierToExpr(const MCExpr *E, 217 MCSymbolRefExpr::VariantKind Variant); 218}; 219 220/// \brief Generic implementations of directive handling, etc. which is shared 221/// (or the default, at least) for all assembler parser. 222class GenericAsmParser : public MCAsmParserExtension { 223 template<bool (GenericAsmParser::*Handler)(StringRef, SMLoc)> 224 void AddDirectiveHandler(StringRef Directive) { 225 getParser().AddDirectiveHandler(this, Directive, 226 HandleDirective<GenericAsmParser, Handler>); 227 } 228public: 229 GenericAsmParser() {} 230 231 AsmParser &getParser() { 232 return (AsmParser&) this->MCAsmParserExtension::getParser(); 233 } 234 235 virtual void Initialize(MCAsmParser &Parser) { 236 // Call the base implementation. 237 this->MCAsmParserExtension::Initialize(Parser); 238 239 // Debugging directives. 240 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveFile>(".file"); 241 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLine>(".line"); 242 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLoc>(".loc"); 243 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveStabs>(".stabs"); 244 245 // CFI directives. 246 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIStartProc>( 247 ".cfi_startproc"); 248 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIEndProc>( 249 ".cfi_endproc"); 250 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfa>( 251 ".cfi_def_cfa"); 252 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfaOffset>( 253 ".cfi_def_cfa_offset"); 254 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfaRegister>( 255 ".cfi_def_cfa_register"); 256 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIOffset>( 257 ".cfi_offset"); 258 AddDirectiveHandler< 259 &GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_personality"); 260 AddDirectiveHandler< 261 &GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_lsda"); 262 AddDirectiveHandler< 263 &GenericAsmParser::ParseDirectiveCFIRememberState>(".cfi_remember_state"); 264 AddDirectiveHandler< 265 &GenericAsmParser::ParseDirectiveCFIRestoreState>(".cfi_restore_state"); 266 267 // Macro directives. 268 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>( 269 ".macros_on"); 270 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>( 271 ".macros_off"); 272 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacro>(".macro"); 273 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endm"); 274 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endmacro"); 275 276 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".sleb128"); 277 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".uleb128"); 278 } 279 280 bool ParseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); 281 282 bool ParseDirectiveFile(StringRef, SMLoc DirectiveLoc); 283 bool ParseDirectiveLine(StringRef, SMLoc DirectiveLoc); 284 bool ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc); 285 bool ParseDirectiveStabs(StringRef, SMLoc DirectiveLoc); 286 bool ParseDirectiveCFIStartProc(StringRef, SMLoc DirectiveLoc); 287 bool ParseDirectiveCFIEndProc(StringRef, SMLoc DirectiveLoc); 288 bool ParseDirectiveCFIDefCfa(StringRef, SMLoc DirectiveLoc); 289 bool ParseDirectiveCFIDefCfaOffset(StringRef, SMLoc DirectiveLoc); 290 bool ParseDirectiveCFIDefCfaRegister(StringRef, SMLoc DirectiveLoc); 291 bool ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc); 292 bool ParseDirectiveCFIPersonalityOrLsda(StringRef, SMLoc DirectiveLoc); 293 bool ParseDirectiveCFIRememberState(StringRef, SMLoc DirectiveLoc); 294 bool ParseDirectiveCFIRestoreState(StringRef, SMLoc DirectiveLoc); 295 296 bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc); 297 bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc); 298 bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc); 299 300 bool ParseDirectiveLEB128(StringRef, SMLoc); 301}; 302 303} 304 305namespace llvm { 306 307extern MCAsmParserExtension *createDarwinAsmParser(); 308extern MCAsmParserExtension *createELFAsmParser(); 309extern MCAsmParserExtension *createCOFFAsmParser(); 310 311} 312 313enum { DEFAULT_ADDRSPACE = 0 }; 314 315AsmParser::AsmParser(const Target &T, SourceMgr &_SM, MCContext &_Ctx, 316 MCStreamer &_Out, const MCAsmInfo &_MAI) 317 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), SrcMgr(_SM), 318 GenericParser(new GenericAsmParser), PlatformParser(0), 319 CurBuffer(0), MacrosEnabled(true) { 320 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 321 322 // Initialize the generic parser. 323 GenericParser->Initialize(*this); 324 325 // Initialize the platform / file format parser. 326 // 327 // FIXME: This is a hack, we need to (majorly) cleanup how these objects are 328 // created. 329 if (_MAI.hasMicrosoftFastStdCallMangling()) { 330 PlatformParser = createCOFFAsmParser(); 331 PlatformParser->Initialize(*this); 332 } else if (_MAI.hasSubsectionsViaSymbols()) { 333 PlatformParser = createDarwinAsmParser(); 334 PlatformParser->Initialize(*this); 335 } else { 336 PlatformParser = createELFAsmParser(); 337 PlatformParser->Initialize(*this); 338 } 339} 340 341AsmParser::~AsmParser() { 342 assert(ActiveMacros.empty() && "Unexpected active macro instantiation!"); 343 344 // Destroy any macros. 345 for (StringMap<Macro*>::iterator it = MacroMap.begin(), 346 ie = MacroMap.end(); it != ie; ++it) 347 delete it->getValue(); 348 349 delete PlatformParser; 350 delete GenericParser; 351} 352 353void AsmParser::PrintMacroInstantiations() { 354 // Print the active macro instantiation stack. 355 for (std::vector<MacroInstantiation*>::const_reverse_iterator 356 it = ActiveMacros.rbegin(), ie = ActiveMacros.rend(); it != ie; ++it) 357 PrintMessage((*it)->InstantiationLoc, "while in macro instantiation", 358 "note"); 359} 360 361void AsmParser::Warning(SMLoc L, const Twine &Msg) { 362 PrintMessage(L, Msg, "warning"); 363 PrintMacroInstantiations(); 364} 365 366bool AsmParser::Error(SMLoc L, const Twine &Msg) { 367 HadError = true; 368 PrintMessage(L, Msg, "error"); 369 PrintMacroInstantiations(); 370 return true; 371} 372 373bool AsmParser::EnterIncludeFile(const std::string &Filename) { 374 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc()); 375 if (NewBuf == -1) 376 return true; 377 378 CurBuffer = NewBuf; 379 380 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 381 382 return false; 383} 384 385void AsmParser::JumpToLoc(SMLoc Loc) { 386 CurBuffer = SrcMgr.FindBufferContainingLoc(Loc); 387 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer()); 388} 389 390const AsmToken &AsmParser::Lex() { 391 const AsmToken *tok = &Lexer.Lex(); 392 393 if (tok->is(AsmToken::Eof)) { 394 // If this is the end of an included file, pop the parent file off the 395 // include stack. 396 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); 397 if (ParentIncludeLoc != SMLoc()) { 398 JumpToLoc(ParentIncludeLoc); 399 tok = &Lexer.Lex(); 400 } 401 } 402 403 if (tok->is(AsmToken::Error)) 404 Error(Lexer.getErrLoc(), Lexer.getErr()); 405 406 return *tok; 407} 408 409bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { 410 // Create the initial section, if requested. 411 if (!NoInitialTextSection) 412 Out.InitSections(); 413 414 // Prime the lexer. 415 Lex(); 416 417 HadError = false; 418 AsmCond StartingCondState = TheCondState; 419 420 // While we have input, parse each statement. 421 while (Lexer.isNot(AsmToken::Eof)) { 422 if (!ParseStatement()) continue; 423 424 // We had an error, validate that one was emitted and recover by skipping to 425 // the next line. 426 assert(HadError && "Parse statement returned an error, but none emitted!"); 427 EatToEndOfStatement(); 428 } 429 430 if (TheCondState.TheCond != StartingCondState.TheCond || 431 TheCondState.Ignore != StartingCondState.Ignore) 432 return TokError("unmatched .ifs or .elses"); 433 434 // Check to see there are no empty DwarfFile slots. 435 const std::vector<MCDwarfFile *> &MCDwarfFiles = 436 getContext().getMCDwarfFiles(); 437 for (unsigned i = 1; i < MCDwarfFiles.size(); i++) { 438 if (!MCDwarfFiles[i]) 439 TokError("unassigned file number: " + Twine(i) + " for .file directives"); 440 } 441 442 // Finalize the output stream if there are no errors and if the client wants 443 // us to. 444 if (!HadError && !NoFinalize) 445 Out.Finish(); 446 447 return HadError; 448} 449 450void AsmParser::CheckForValidSection() { 451 if (!getStreamer().getCurrentSection()) { 452 TokError("expected section directive before assembly directive"); 453 Out.SwitchSection(Ctx.getMachOSection( 454 "__TEXT", "__text", 455 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 456 0, SectionKind::getText())); 457 } 458} 459 460/// EatToEndOfStatement - Throw away the rest of the line for testing purposes. 461void AsmParser::EatToEndOfStatement() { 462 while (Lexer.isNot(AsmToken::EndOfStatement) && 463 Lexer.isNot(AsmToken::Eof)) 464 Lex(); 465 466 // Eat EOL. 467 if (Lexer.is(AsmToken::EndOfStatement)) 468 Lex(); 469} 470 471StringRef AsmParser::ParseStringToEndOfStatement() { 472 const char *Start = getTok().getLoc().getPointer(); 473 474 while (Lexer.isNot(AsmToken::EndOfStatement) && 475 Lexer.isNot(AsmToken::Eof)) 476 Lex(); 477 478 const char *End = getTok().getLoc().getPointer(); 479 return StringRef(Start, End - Start); 480} 481 482/// ParseParenExpr - Parse a paren expression and return it. 483/// NOTE: This assumes the leading '(' has already been consumed. 484/// 485/// parenexpr ::= expr) 486/// 487bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { 488 if (ParseExpression(Res)) return true; 489 if (Lexer.isNot(AsmToken::RParen)) 490 return TokError("expected ')' in parentheses expression"); 491 EndLoc = Lexer.getLoc(); 492 Lex(); 493 return false; 494} 495 496/// ParseBracketExpr - Parse a bracket expression and return it. 497/// NOTE: This assumes the leading '[' has already been consumed. 498/// 499/// bracketexpr ::= expr] 500/// 501bool AsmParser::ParseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { 502 if (ParseExpression(Res)) return true; 503 if (Lexer.isNot(AsmToken::RBrac)) 504 return TokError("expected ']' in brackets expression"); 505 EndLoc = Lexer.getLoc(); 506 Lex(); 507 return false; 508} 509 510/// ParsePrimaryExpr - Parse a primary expression and return it. 511/// primaryexpr ::= (parenexpr 512/// primaryexpr ::= symbol 513/// primaryexpr ::= number 514/// primaryexpr ::= '.' 515/// primaryexpr ::= ~,+,- primaryexpr 516bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) { 517 switch (Lexer.getKind()) { 518 default: 519 return TokError("unknown token in expression"); 520 case AsmToken::Exclaim: 521 Lex(); // Eat the operator. 522 if (ParsePrimaryExpr(Res, EndLoc)) 523 return true; 524 Res = MCUnaryExpr::CreateLNot(Res, getContext()); 525 return false; 526 case AsmToken::Dollar: 527 case AsmToken::String: 528 case AsmToken::Identifier: { 529 EndLoc = Lexer.getLoc(); 530 531 StringRef Identifier; 532 if (ParseIdentifier(Identifier)) 533 return false; 534 535 // This is a symbol reference. 536 std::pair<StringRef, StringRef> Split = Identifier.split('@'); 537 MCSymbol *Sym = getContext().GetOrCreateSymbol(Split.first); 538 539 // Lookup the symbol variant if used. 540 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 541 if (Split.first.size() != Identifier.size()) { 542 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 543 if (Variant == MCSymbolRefExpr::VK_Invalid) { 544 Variant = MCSymbolRefExpr::VK_None; 545 return TokError("invalid variant '" + Split.second + "'"); 546 } 547 } 548 549 // If this is an absolute variable reference, substitute it now to preserve 550 // semantics in the face of reassignment. 551 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) { 552 if (Variant) 553 return Error(EndLoc, "unexpected modifier on variable reference"); 554 555 Res = Sym->getVariableValue(); 556 return false; 557 } 558 559 // Otherwise create a symbol ref. 560 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext()); 561 return false; 562 } 563 case AsmToken::Integer: { 564 SMLoc Loc = getTok().getLoc(); 565 int64_t IntVal = getTok().getIntVal(); 566 Res = MCConstantExpr::Create(IntVal, getContext()); 567 EndLoc = Lexer.getLoc(); 568 Lex(); // Eat token. 569 // Look for 'b' or 'f' following an Integer as a directional label 570 if (Lexer.getKind() == AsmToken::Identifier) { 571 StringRef IDVal = getTok().getString(); 572 if (IDVal == "f" || IDVal == "b"){ 573 MCSymbol *Sym = Ctx.GetDirectionalLocalSymbol(IntVal, 574 IDVal == "f" ? 1 : 0); 575 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, 576 getContext()); 577 if(IDVal == "b" && Sym->isUndefined()) 578 return Error(Loc, "invalid reference to undefined symbol"); 579 EndLoc = Lexer.getLoc(); 580 Lex(); // Eat identifier. 581 } 582 } 583 return false; 584 } 585 case AsmToken::Real: { 586 APFloat RealVal(APFloat::IEEEdouble, getTok().getString()); 587 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); 588 Res = MCConstantExpr::Create(IntVal, getContext()); 589 Lex(); // Eat token. 590 return false; 591 } 592 case AsmToken::Dot: { 593 // This is a '.' reference, which references the current PC. Emit a 594 // temporary label to the streamer and refer to it. 595 MCSymbol *Sym = Ctx.CreateTempSymbol(); 596 Out.EmitLabel(Sym); 597 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext()); 598 EndLoc = Lexer.getLoc(); 599 Lex(); // Eat identifier. 600 return false; 601 } 602 case AsmToken::LParen: 603 Lex(); // Eat the '('. 604 return ParseParenExpr(Res, EndLoc); 605 case AsmToken::LBrac: 606 if (!PlatformParser->HasBracketExpressions()) 607 return TokError("brackets expression not supported on this target"); 608 Lex(); // Eat the '['. 609 return ParseBracketExpr(Res, EndLoc); 610 case AsmToken::Minus: 611 Lex(); // Eat the operator. 612 if (ParsePrimaryExpr(Res, EndLoc)) 613 return true; 614 Res = MCUnaryExpr::CreateMinus(Res, getContext()); 615 return false; 616 case AsmToken::Plus: 617 Lex(); // Eat the operator. 618 if (ParsePrimaryExpr(Res, EndLoc)) 619 return true; 620 Res = MCUnaryExpr::CreatePlus(Res, getContext()); 621 return false; 622 case AsmToken::Tilde: 623 Lex(); // Eat the operator. 624 if (ParsePrimaryExpr(Res, EndLoc)) 625 return true; 626 Res = MCUnaryExpr::CreateNot(Res, getContext()); 627 return false; 628 } 629} 630 631bool AsmParser::ParseExpression(const MCExpr *&Res) { 632 SMLoc EndLoc; 633 return ParseExpression(Res, EndLoc); 634} 635 636const MCExpr * 637AsmParser::ApplyModifierToExpr(const MCExpr *E, 638 MCSymbolRefExpr::VariantKind Variant) { 639 // Recurse over the given expression, rebuilding it to apply the given variant 640 // if there is exactly one symbol. 641 switch (E->getKind()) { 642 case MCExpr::Target: 643 case MCExpr::Constant: 644 return 0; 645 646 case MCExpr::SymbolRef: { 647 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); 648 649 if (SRE->getKind() != MCSymbolRefExpr::VK_None) { 650 TokError("invalid variant on expression '" + 651 getTok().getIdentifier() + "' (already modified)"); 652 return E; 653 } 654 655 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext()); 656 } 657 658 case MCExpr::Unary: { 659 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); 660 const MCExpr *Sub = ApplyModifierToExpr(UE->getSubExpr(), Variant); 661 if (!Sub) 662 return 0; 663 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext()); 664 } 665 666 case MCExpr::Binary: { 667 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); 668 const MCExpr *LHS = ApplyModifierToExpr(BE->getLHS(), Variant); 669 const MCExpr *RHS = ApplyModifierToExpr(BE->getRHS(), Variant); 670 671 if (!LHS && !RHS) 672 return 0; 673 674 if (!LHS) LHS = BE->getLHS(); 675 if (!RHS) RHS = BE->getRHS(); 676 677 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext()); 678 } 679 } 680 681 assert(0 && "Invalid expression kind!"); 682 return 0; 683} 684 685/// ParseExpression - Parse an expression and return it. 686/// 687/// expr ::= expr +,- expr -> lowest. 688/// expr ::= expr |,^,&,! expr -> middle. 689/// expr ::= expr *,/,%,<<,>> expr -> highest. 690/// expr ::= primaryexpr 691/// 692bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) { 693 // Parse the expression. 694 Res = 0; 695 if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc)) 696 return true; 697 698 // As a special case, we support 'a op b @ modifier' by rewriting the 699 // expression to include the modifier. This is inefficient, but in general we 700 // expect users to use 'a@modifier op b'. 701 if (Lexer.getKind() == AsmToken::At) { 702 Lex(); 703 704 if (Lexer.isNot(AsmToken::Identifier)) 705 return TokError("unexpected symbol modifier following '@'"); 706 707 MCSymbolRefExpr::VariantKind Variant = 708 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); 709 if (Variant == MCSymbolRefExpr::VK_Invalid) 710 return TokError("invalid variant '" + getTok().getIdentifier() + "'"); 711 712 const MCExpr *ModifiedRes = ApplyModifierToExpr(Res, Variant); 713 if (!ModifiedRes) { 714 return TokError("invalid modifier '" + getTok().getIdentifier() + 715 "' (no symbols present)"); 716 return true; 717 } 718 719 Res = ModifiedRes; 720 Lex(); 721 } 722 723 // Try to constant fold it up front, if possible. 724 int64_t Value; 725 if (Res->EvaluateAsAbsolute(Value)) 726 Res = MCConstantExpr::Create(Value, getContext()); 727 728 return false; 729} 730 731bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { 732 Res = 0; 733 return ParseParenExpr(Res, EndLoc) || 734 ParseBinOpRHS(1, Res, EndLoc); 735} 736 737bool AsmParser::ParseAbsoluteExpression(int64_t &Res) { 738 const MCExpr *Expr; 739 740 SMLoc StartLoc = Lexer.getLoc(); 741 if (ParseExpression(Expr)) 742 return true; 743 744 if (!Expr->EvaluateAsAbsolute(Res)) 745 return Error(StartLoc, "expected absolute expression"); 746 747 return false; 748} 749 750static unsigned getBinOpPrecedence(AsmToken::TokenKind K, 751 MCBinaryExpr::Opcode &Kind) { 752 switch (K) { 753 default: 754 return 0; // not a binop. 755 756 // Lowest Precedence: &&, ||, @ 757 case AsmToken::AmpAmp: 758 Kind = MCBinaryExpr::LAnd; 759 return 1; 760 case AsmToken::PipePipe: 761 Kind = MCBinaryExpr::LOr; 762 return 1; 763 764 765 // Low Precedence: |, &, ^ 766 // 767 // FIXME: gas seems to support '!' as an infix operator? 768 case AsmToken::Pipe: 769 Kind = MCBinaryExpr::Or; 770 return 2; 771 case AsmToken::Caret: 772 Kind = MCBinaryExpr::Xor; 773 return 2; 774 case AsmToken::Amp: 775 Kind = MCBinaryExpr::And; 776 return 2; 777 778 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= 779 case AsmToken::EqualEqual: 780 Kind = MCBinaryExpr::EQ; 781 return 3; 782 case AsmToken::ExclaimEqual: 783 case AsmToken::LessGreater: 784 Kind = MCBinaryExpr::NE; 785 return 3; 786 case AsmToken::Less: 787 Kind = MCBinaryExpr::LT; 788 return 3; 789 case AsmToken::LessEqual: 790 Kind = MCBinaryExpr::LTE; 791 return 3; 792 case AsmToken::Greater: 793 Kind = MCBinaryExpr::GT; 794 return 3; 795 case AsmToken::GreaterEqual: 796 Kind = MCBinaryExpr::GTE; 797 return 3; 798 799 // High Intermediate Precedence: +, - 800 case AsmToken::Plus: 801 Kind = MCBinaryExpr::Add; 802 return 4; 803 case AsmToken::Minus: 804 Kind = MCBinaryExpr::Sub; 805 return 4; 806 807 // Highest Precedence: *, /, %, <<, >> 808 case AsmToken::Star: 809 Kind = MCBinaryExpr::Mul; 810 return 5; 811 case AsmToken::Slash: 812 Kind = MCBinaryExpr::Div; 813 return 5; 814 case AsmToken::Percent: 815 Kind = MCBinaryExpr::Mod; 816 return 5; 817 case AsmToken::LessLess: 818 Kind = MCBinaryExpr::Shl; 819 return 5; 820 case AsmToken::GreaterGreater: 821 Kind = MCBinaryExpr::Shr; 822 return 5; 823 } 824} 825 826 827/// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'. 828/// Res contains the LHS of the expression on input. 829bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, 830 SMLoc &EndLoc) { 831 while (1) { 832 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; 833 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); 834 835 // If the next token is lower precedence than we are allowed to eat, return 836 // successfully with what we ate already. 837 if (TokPrec < Precedence) 838 return false; 839 840 Lex(); 841 842 // Eat the next primary expression. 843 const MCExpr *RHS; 844 if (ParsePrimaryExpr(RHS, EndLoc)) return true; 845 846 // If BinOp binds less tightly with RHS than the operator after RHS, let 847 // the pending operator take RHS as its LHS. 848 MCBinaryExpr::Opcode Dummy; 849 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); 850 if (TokPrec < NextTokPrec) { 851 if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true; 852 } 853 854 // Merge LHS and RHS according to operator. 855 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext()); 856 } 857} 858 859 860 861 862/// ParseStatement: 863/// ::= EndOfStatement 864/// ::= Label* Directive ...Operands... EndOfStatement 865/// ::= Label* Identifier OperandList* EndOfStatement 866bool AsmParser::ParseStatement() { 867 if (Lexer.is(AsmToken::EndOfStatement)) { 868 Out.AddBlankLine(); 869 Lex(); 870 return false; 871 } 872 873 // Statements always start with an identifier or are a full line comment. 874 AsmToken ID = getTok(); 875 SMLoc IDLoc = ID.getLoc(); 876 StringRef IDVal; 877 int64_t LocalLabelVal = -1; 878 // A full line comment is a '#' as the first token. 879 if (Lexer.is(AsmToken::Hash)) { 880 EatToEndOfStatement(); 881 return false; 882 } 883 884 // Allow an integer followed by a ':' as a directional local label. 885 if (Lexer.is(AsmToken::Integer)) { 886 LocalLabelVal = getTok().getIntVal(); 887 if (LocalLabelVal < 0) { 888 if (!TheCondState.Ignore) 889 return TokError("unexpected token at start of statement"); 890 IDVal = ""; 891 } 892 else { 893 IDVal = getTok().getString(); 894 Lex(); // Consume the integer token to be used as an identifier token. 895 if (Lexer.getKind() != AsmToken::Colon) { 896 if (!TheCondState.Ignore) 897 return TokError("unexpected token at start of statement"); 898 } 899 } 900 } else if (ParseIdentifier(IDVal)) { 901 if (!TheCondState.Ignore) 902 return TokError("unexpected token at start of statement"); 903 IDVal = ""; 904 } 905 906 // Handle conditional assembly here before checking for skipping. We 907 // have to do this so that .endif isn't skipped in a ".if 0" block for 908 // example. 909 if (IDVal == ".if") 910 return ParseDirectiveIf(IDLoc); 911 if (IDVal == ".ifdef") 912 return ParseDirectiveIfdef(IDLoc, true); 913 if (IDVal == ".ifndef" || IDVal == ".ifnotdef") 914 return ParseDirectiveIfdef(IDLoc, false); 915 if (IDVal == ".elseif") 916 return ParseDirectiveElseIf(IDLoc); 917 if (IDVal == ".else") 918 return ParseDirectiveElse(IDLoc); 919 if (IDVal == ".endif") 920 return ParseDirectiveEndIf(IDLoc); 921 922 // If we are in a ".if 0" block, ignore this statement. 923 if (TheCondState.Ignore) { 924 EatToEndOfStatement(); 925 return false; 926 } 927 928 // FIXME: Recurse on local labels? 929 930 // See what kind of statement we have. 931 switch (Lexer.getKind()) { 932 case AsmToken::Colon: { 933 CheckForValidSection(); 934 935 // identifier ':' -> Label. 936 Lex(); 937 938 // Diagnose attempt to use a variable as a label. 939 // 940 // FIXME: Diagnostics. Note the location of the definition as a label. 941 // FIXME: This doesn't diagnose assignment to a symbol which has been 942 // implicitly marked as external. 943 MCSymbol *Sym; 944 if (LocalLabelVal == -1) 945 Sym = getContext().GetOrCreateSymbol(IDVal); 946 else 947 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal); 948 if (!Sym->isUndefined() || Sym->isVariable()) 949 return Error(IDLoc, "invalid symbol redefinition"); 950 951 // Emit the label. 952 Out.EmitLabel(Sym); 953 954 // Consume any end of statement token, if present, to avoid spurious 955 // AddBlankLine calls(). 956 if (Lexer.is(AsmToken::EndOfStatement)) { 957 Lex(); 958 if (Lexer.is(AsmToken::Eof)) 959 return false; 960 } 961 962 return ParseStatement(); 963 } 964 965 case AsmToken::Equal: 966 // identifier '=' ... -> assignment statement 967 Lex(); 968 969 return ParseAssignment(IDVal, true); 970 971 default: // Normal instruction or directive. 972 break; 973 } 974 975 // If macros are enabled, check to see if this is a macro instantiation. 976 if (MacrosEnabled) 977 if (const Macro *M = MacroMap.lookup(IDVal)) 978 return HandleMacroEntry(IDVal, IDLoc, M); 979 980 // Otherwise, we have a normal instruction or directive. 981 if (IDVal[0] == '.') { 982 // Assembler features 983 if (IDVal == ".set" || IDVal == ".equ") 984 return ParseDirectiveSet(IDVal, true); 985 if (IDVal == ".equiv") 986 return ParseDirectiveSet(IDVal, false); 987 988 // Data directives 989 990 if (IDVal == ".ascii") 991 return ParseDirectiveAscii(IDVal, false); 992 if (IDVal == ".asciz" || IDVal == ".string") 993 return ParseDirectiveAscii(IDVal, true); 994 995 if (IDVal == ".byte") 996 return ParseDirectiveValue(1); 997 if (IDVal == ".short") 998 return ParseDirectiveValue(2); 999 if (IDVal == ".value") 1000 return ParseDirectiveValue(2); 1001 if (IDVal == ".2byte") 1002 return ParseDirectiveValue(2); 1003 if (IDVal == ".long") 1004 return ParseDirectiveValue(4); 1005 if (IDVal == ".int") 1006 return ParseDirectiveValue(4); 1007 if (IDVal == ".4byte") 1008 return ParseDirectiveValue(4); 1009 if (IDVal == ".quad") 1010 return ParseDirectiveValue(8); 1011 if (IDVal == ".8byte") 1012 return ParseDirectiveValue(8); 1013 if (IDVal == ".single" || IDVal == ".float") 1014 return ParseDirectiveRealValue(APFloat::IEEEsingle); 1015 if (IDVal == ".double") 1016 return ParseDirectiveRealValue(APFloat::IEEEdouble); 1017 1018 if (IDVal == ".align") { 1019 bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes(); 1020 return ParseDirectiveAlign(IsPow2, /*ExprSize=*/1); 1021 } 1022 if (IDVal == ".align32") { 1023 bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes(); 1024 return ParseDirectiveAlign(IsPow2, /*ExprSize=*/4); 1025 } 1026 if (IDVal == ".balign") 1027 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); 1028 if (IDVal == ".balignw") 1029 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); 1030 if (IDVal == ".balignl") 1031 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); 1032 if (IDVal == ".p2align") 1033 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); 1034 if (IDVal == ".p2alignw") 1035 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); 1036 if (IDVal == ".p2alignl") 1037 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); 1038 1039 if (IDVal == ".org") 1040 return ParseDirectiveOrg(); 1041 1042 if (IDVal == ".fill") 1043 return ParseDirectiveFill(); 1044 if (IDVal == ".space") 1045 return ParseDirectiveSpace(); 1046 if (IDVal == ".zero") 1047 return ParseDirectiveZero(); 1048 1049 // Symbol attribute directives 1050 1051 if (IDVal == ".globl" || IDVal == ".global") 1052 return ParseDirectiveSymbolAttribute(MCSA_Global); 1053 // ELF only? Should it be here? 1054 if (IDVal == ".local") 1055 return ParseDirectiveSymbolAttribute(MCSA_Local); 1056 if (IDVal == ".hidden") 1057 return ParseDirectiveSymbolAttribute(MCSA_Hidden); 1058 if (IDVal == ".indirect_symbol") 1059 return ParseDirectiveSymbolAttribute(MCSA_IndirectSymbol); 1060 if (IDVal == ".internal") 1061 return ParseDirectiveSymbolAttribute(MCSA_Internal); 1062 if (IDVal == ".lazy_reference") 1063 return ParseDirectiveSymbolAttribute(MCSA_LazyReference); 1064 if (IDVal == ".no_dead_strip") 1065 return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip); 1066 if (IDVal == ".symbol_resolver") 1067 return ParseDirectiveSymbolAttribute(MCSA_SymbolResolver); 1068 if (IDVal == ".private_extern") 1069 return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern); 1070 if (IDVal == ".protected") 1071 return ParseDirectiveSymbolAttribute(MCSA_Protected); 1072 if (IDVal == ".reference") 1073 return ParseDirectiveSymbolAttribute(MCSA_Reference); 1074 if (IDVal == ".weak") 1075 return ParseDirectiveSymbolAttribute(MCSA_Weak); 1076 if (IDVal == ".weak_definition") 1077 return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition); 1078 if (IDVal == ".weak_reference") 1079 return ParseDirectiveSymbolAttribute(MCSA_WeakReference); 1080 if (IDVal == ".weak_def_can_be_hidden") 1081 return ParseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); 1082 1083 if (IDVal == ".comm") 1084 return ParseDirectiveComm(/*IsLocal=*/false); 1085 if (IDVal == ".lcomm") 1086 return ParseDirectiveComm(/*IsLocal=*/true); 1087 1088 if (IDVal == ".abort") 1089 return ParseDirectiveAbort(); 1090 if (IDVal == ".include") 1091 return ParseDirectiveInclude(); 1092 1093 if (IDVal == ".code16" || IDVal == ".code32" || IDVal == ".code64") 1094 return TokError(Twine(IDVal) + " not supported yet"); 1095 1096 // Look up the handler in the handler table. 1097 std::pair<MCAsmParserExtension*, DirectiveHandler> Handler = 1098 DirectiveMap.lookup(IDVal); 1099 if (Handler.first) 1100 return (*Handler.second)(Handler.first, IDVal, IDLoc); 1101 1102 // Target hook for parsing target specific directives. 1103 if (!getTargetParser().ParseDirective(ID)) 1104 return false; 1105 1106 Warning(IDLoc, "ignoring directive for now"); 1107 EatToEndOfStatement(); 1108 return false; 1109 } 1110 1111 CheckForValidSection(); 1112 1113 // Canonicalize the opcode to lower case. 1114 SmallString<128> Opcode; 1115 for (unsigned i = 0, e = IDVal.size(); i != e; ++i) 1116 Opcode.push_back(tolower(IDVal[i])); 1117 1118 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands; 1119 bool HadError = getTargetParser().ParseInstruction(Opcode.str(), IDLoc, 1120 ParsedOperands); 1121 1122 // Dump the parsed representation, if requested. 1123 if (getShowParsedOperands()) { 1124 SmallString<256> Str; 1125 raw_svector_ostream OS(Str); 1126 OS << "parsed instruction: ["; 1127 for (unsigned i = 0; i != ParsedOperands.size(); ++i) { 1128 if (i != 0) 1129 OS << ", "; 1130 ParsedOperands[i]->dump(OS); 1131 } 1132 OS << "]"; 1133 1134 PrintMessage(IDLoc, OS.str(), "note"); 1135 } 1136 1137 // If parsing succeeded, match the instruction. 1138 if (!HadError) 1139 HadError = getTargetParser().MatchAndEmitInstruction(IDLoc, ParsedOperands, 1140 Out); 1141 1142 // Free any parsed operands. 1143 for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i) 1144 delete ParsedOperands[i]; 1145 1146 // Don't skip the rest of the line, the instruction parser is responsible for 1147 // that. 1148 return false; 1149} 1150 1151MacroInstantiation::MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL, 1152 const std::vector<std::vector<AsmToken> > &A) 1153 : TheMacro(M), InstantiationLoc(IL), ExitLoc(EL) 1154{ 1155 // Macro instantiation is lexical, unfortunately. We construct a new buffer 1156 // to hold the macro body with substitutions. 1157 SmallString<256> Buf; 1158 raw_svector_ostream OS(Buf); 1159 1160 StringRef Body = M->Body; 1161 while (!Body.empty()) { 1162 // Scan for the next substitution. 1163 std::size_t End = Body.size(), Pos = 0; 1164 for (; Pos != End; ++Pos) { 1165 // Check for a substitution or escape. 1166 if (Body[Pos] != '$' || Pos + 1 == End) 1167 continue; 1168 1169 char Next = Body[Pos + 1]; 1170 if (Next == '$' || Next == 'n' || isdigit(Next)) 1171 break; 1172 } 1173 1174 // Add the prefix. 1175 OS << Body.slice(0, Pos); 1176 1177 // Check if we reached the end. 1178 if (Pos == End) 1179 break; 1180 1181 switch (Body[Pos+1]) { 1182 // $$ => $ 1183 case '$': 1184 OS << '$'; 1185 break; 1186 1187 // $n => number of arguments 1188 case 'n': 1189 OS << A.size(); 1190 break; 1191 1192 // $[0-9] => argument 1193 default: { 1194 // Missing arguments are ignored. 1195 unsigned Index = Body[Pos+1] - '0'; 1196 if (Index >= A.size()) 1197 break; 1198 1199 // Otherwise substitute with the token values, with spaces eliminated. 1200 for (std::vector<AsmToken>::const_iterator it = A[Index].begin(), 1201 ie = A[Index].end(); it != ie; ++it) 1202 OS << it->getString(); 1203 break; 1204 } 1205 } 1206 1207 // Update the scan point. 1208 Body = Body.substr(Pos + 2); 1209 } 1210 1211 // We include the .endmacro in the buffer as our queue to exit the macro 1212 // instantiation. 1213 OS << ".endmacro\n"; 1214 1215 Instantiation = MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 1216} 1217 1218bool AsmParser::HandleMacroEntry(StringRef Name, SMLoc NameLoc, 1219 const Macro *M) { 1220 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate 1221 // this, although we should protect against infinite loops. 1222 if (ActiveMacros.size() == 20) 1223 return TokError("macros cannot be nested more than 20 levels deep"); 1224 1225 // Parse the macro instantiation arguments. 1226 std::vector<std::vector<AsmToken> > MacroArguments; 1227 MacroArguments.push_back(std::vector<AsmToken>()); 1228 unsigned ParenLevel = 0; 1229 for (;;) { 1230 if (Lexer.is(AsmToken::Eof)) 1231 return TokError("unexpected token in macro instantiation"); 1232 if (Lexer.is(AsmToken::EndOfStatement)) 1233 break; 1234 1235 // If we aren't inside parentheses and this is a comma, start a new token 1236 // list. 1237 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) { 1238 MacroArguments.push_back(std::vector<AsmToken>()); 1239 } else { 1240 // Adjust the current parentheses level. 1241 if (Lexer.is(AsmToken::LParen)) 1242 ++ParenLevel; 1243 else if (Lexer.is(AsmToken::RParen) && ParenLevel) 1244 --ParenLevel; 1245 1246 // Append the token to the current argument list. 1247 MacroArguments.back().push_back(getTok()); 1248 } 1249 Lex(); 1250 } 1251 1252 // Create the macro instantiation object and add to the current macro 1253 // instantiation stack. 1254 MacroInstantiation *MI = new MacroInstantiation(M, NameLoc, 1255 getTok().getLoc(), 1256 MacroArguments); 1257 ActiveMacros.push_back(MI); 1258 1259 // Jump to the macro instantiation and prime the lexer. 1260 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc()); 1261 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); 1262 Lex(); 1263 1264 return false; 1265} 1266 1267void AsmParser::HandleMacroExit() { 1268 // Jump to the EndOfStatement we should return to, and consume it. 1269 JumpToLoc(ActiveMacros.back()->ExitLoc); 1270 Lex(); 1271 1272 // Pop the instantiation entry. 1273 delete ActiveMacros.back(); 1274 ActiveMacros.pop_back(); 1275} 1276 1277static void MarkUsed(const MCExpr *Value) { 1278 switch (Value->getKind()) { 1279 case MCExpr::Binary: 1280 MarkUsed(static_cast<const MCBinaryExpr*>(Value)->getLHS()); 1281 MarkUsed(static_cast<const MCBinaryExpr*>(Value)->getRHS()); 1282 break; 1283 case MCExpr::Target: 1284 case MCExpr::Constant: 1285 break; 1286 case MCExpr::SymbolRef: { 1287 static_cast<const MCSymbolRefExpr*>(Value)->getSymbol().setUsed(true); 1288 break; 1289 } 1290 case MCExpr::Unary: 1291 MarkUsed(static_cast<const MCUnaryExpr*>(Value)->getSubExpr()); 1292 break; 1293 } 1294} 1295 1296bool AsmParser::ParseAssignment(StringRef Name, bool allow_redef) { 1297 // FIXME: Use better location, we should use proper tokens. 1298 SMLoc EqualLoc = Lexer.getLoc(); 1299 1300 const MCExpr *Value; 1301 if (ParseExpression(Value)) 1302 return true; 1303 1304 MarkUsed(Value); 1305 1306 if (Lexer.isNot(AsmToken::EndOfStatement)) 1307 return TokError("unexpected token in assignment"); 1308 1309 // Eat the end of statement marker. 1310 Lex(); 1311 1312 // Validate that the LHS is allowed to be a variable (either it has not been 1313 // used as a symbol, or it is an absolute symbol). 1314 MCSymbol *Sym = getContext().LookupSymbol(Name); 1315 if (Sym) { 1316 // Diagnose assignment to a label. 1317 // 1318 // FIXME: Diagnostics. Note the location of the definition as a label. 1319 // FIXME: Diagnose assignment to protected identifier (e.g., register name). 1320 if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable()) 1321 ; // Allow redefinitions of undefined symbols only used in directives. 1322 else if (!Sym->isUndefined() && (!Sym->isAbsolute() || !allow_redef)) 1323 return Error(EqualLoc, "redefinition of '" + Name + "'"); 1324 else if (!Sym->isVariable()) 1325 return Error(EqualLoc, "invalid assignment to '" + Name + "'"); 1326 else if (!isa<MCConstantExpr>(Sym->getVariableValue())) 1327 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" + 1328 Name + "'"); 1329 1330 // Don't count these checks as uses. 1331 Sym->setUsed(false); 1332 } else 1333 Sym = getContext().GetOrCreateSymbol(Name); 1334 1335 // FIXME: Handle '.'. 1336 1337 // Do the assignment. 1338 Out.EmitAssignment(Sym, Value); 1339 1340 return false; 1341} 1342 1343/// ParseIdentifier: 1344/// ::= identifier 1345/// ::= string 1346bool AsmParser::ParseIdentifier(StringRef &Res) { 1347 // The assembler has relaxed rules for accepting identifiers, in particular we 1348 // allow things like '.globl $foo', which would normally be separate 1349 // tokens. At this level, we have already lexed so we cannot (currently) 1350 // handle this as a context dependent token, instead we detect adjacent tokens 1351 // and return the combined identifier. 1352 if (Lexer.is(AsmToken::Dollar)) { 1353 SMLoc DollarLoc = getLexer().getLoc(); 1354 1355 // Consume the dollar sign, and check for a following identifier. 1356 Lex(); 1357 if (Lexer.isNot(AsmToken::Identifier)) 1358 return true; 1359 1360 // We have a '$' followed by an identifier, make sure they are adjacent. 1361 if (DollarLoc.getPointer() + 1 != getTok().getLoc().getPointer()) 1362 return true; 1363 1364 // Construct the joined identifier and consume the token. 1365 Res = StringRef(DollarLoc.getPointer(), 1366 getTok().getIdentifier().size() + 1); 1367 Lex(); 1368 return false; 1369 } 1370 1371 if (Lexer.isNot(AsmToken::Identifier) && 1372 Lexer.isNot(AsmToken::String)) 1373 return true; 1374 1375 Res = getTok().getIdentifier(); 1376 1377 Lex(); // Consume the identifier token. 1378 1379 return false; 1380} 1381 1382/// ParseDirectiveSet: 1383/// ::= .equ identifier ',' expression 1384/// ::= .equiv identifier ',' expression 1385/// ::= .set identifier ',' expression 1386bool AsmParser::ParseDirectiveSet(StringRef IDVal, bool allow_redef) { 1387 StringRef Name; 1388 1389 if (ParseIdentifier(Name)) 1390 return TokError("expected identifier after '" + Twine(IDVal) + "'"); 1391 1392 if (getLexer().isNot(AsmToken::Comma)) 1393 return TokError("unexpected token in '" + Twine(IDVal) + "'"); 1394 Lex(); 1395 1396 return ParseAssignment(Name, allow_redef); 1397} 1398 1399bool AsmParser::ParseEscapedString(std::string &Data) { 1400 assert(getLexer().is(AsmToken::String) && "Unexpected current token!"); 1401 1402 Data = ""; 1403 StringRef Str = getTok().getStringContents(); 1404 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 1405 if (Str[i] != '\\') { 1406 Data += Str[i]; 1407 continue; 1408 } 1409 1410 // Recognize escaped characters. Note that this escape semantics currently 1411 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes. 1412 ++i; 1413 if (i == e) 1414 return TokError("unexpected backslash at end of string"); 1415 1416 // Recognize octal sequences. 1417 if ((unsigned) (Str[i] - '0') <= 7) { 1418 // Consume up to three octal characters. 1419 unsigned Value = Str[i] - '0'; 1420 1421 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) { 1422 ++i; 1423 Value = Value * 8 + (Str[i] - '0'); 1424 1425 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) { 1426 ++i; 1427 Value = Value * 8 + (Str[i] - '0'); 1428 } 1429 } 1430 1431 if (Value > 255) 1432 return TokError("invalid octal escape sequence (out of range)"); 1433 1434 Data += (unsigned char) Value; 1435 continue; 1436 } 1437 1438 // Otherwise recognize individual escapes. 1439 switch (Str[i]) { 1440 default: 1441 // Just reject invalid escape sequences for now. 1442 return TokError("invalid escape sequence (unrecognized character)"); 1443 1444 case 'b': Data += '\b'; break; 1445 case 'f': Data += '\f'; break; 1446 case 'n': Data += '\n'; break; 1447 case 'r': Data += '\r'; break; 1448 case 't': Data += '\t'; break; 1449 case '"': Data += '"'; break; 1450 case '\\': Data += '\\'; break; 1451 } 1452 } 1453 1454 return false; 1455} 1456 1457/// ParseDirectiveAscii: 1458/// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ] 1459bool AsmParser::ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { 1460 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1461 CheckForValidSection(); 1462 1463 for (;;) { 1464 if (getLexer().isNot(AsmToken::String)) 1465 return TokError("expected string in '" + Twine(IDVal) + "' directive"); 1466 1467 std::string Data; 1468 if (ParseEscapedString(Data)) 1469 return true; 1470 1471 getStreamer().EmitBytes(Data, DEFAULT_ADDRSPACE); 1472 if (ZeroTerminated) 1473 getStreamer().EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE); 1474 1475 Lex(); 1476 1477 if (getLexer().is(AsmToken::EndOfStatement)) 1478 break; 1479 1480 if (getLexer().isNot(AsmToken::Comma)) 1481 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 1482 Lex(); 1483 } 1484 } 1485 1486 Lex(); 1487 return false; 1488} 1489 1490/// ParseDirectiveValue 1491/// ::= (.byte | .short | ... ) [ expression (, expression)* ] 1492bool AsmParser::ParseDirectiveValue(unsigned Size) { 1493 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1494 CheckForValidSection(); 1495 1496 for (;;) { 1497 const MCExpr *Value; 1498 if (ParseExpression(Value)) 1499 return true; 1500 1501 // Special case constant expressions to match code generator. 1502 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) 1503 getStreamer().EmitIntValue(MCE->getValue(), Size, DEFAULT_ADDRSPACE); 1504 else 1505 getStreamer().EmitValue(Value, Size, DEFAULT_ADDRSPACE); 1506 1507 if (getLexer().is(AsmToken::EndOfStatement)) 1508 break; 1509 1510 // FIXME: Improve diagnostic. 1511 if (getLexer().isNot(AsmToken::Comma)) 1512 return TokError("unexpected token in directive"); 1513 Lex(); 1514 } 1515 } 1516 1517 Lex(); 1518 return false; 1519} 1520 1521/// ParseDirectiveRealValue 1522/// ::= (.single | .double) [ expression (, expression)* ] 1523bool AsmParser::ParseDirectiveRealValue(const fltSemantics &Semantics) { 1524 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1525 CheckForValidSection(); 1526 1527 for (;;) { 1528 // We don't truly support arithmetic on floating point expressions, so we 1529 // have to manually parse unary prefixes. 1530 bool IsNeg = false; 1531 if (getLexer().is(AsmToken::Minus)) { 1532 Lex(); 1533 IsNeg = true; 1534 } else if (getLexer().is(AsmToken::Plus)) 1535 Lex(); 1536 1537 if (getLexer().isNot(AsmToken::Integer) && 1538 getLexer().isNot(AsmToken::Real)) 1539 return TokError("unexpected token in directive"); 1540 1541 // Convert to an APFloat. 1542 APFloat Value(Semantics); 1543 if (Value.convertFromString(getTok().getString(), 1544 APFloat::rmNearestTiesToEven) == 1545 APFloat::opInvalidOp) 1546 return TokError("invalid floating point literal"); 1547 if (IsNeg) 1548 Value.changeSign(); 1549 1550 // Consume the numeric token. 1551 Lex(); 1552 1553 // Emit the value as an integer. 1554 APInt AsInt = Value.bitcastToAPInt(); 1555 getStreamer().EmitIntValue(AsInt.getLimitedValue(), 1556 AsInt.getBitWidth() / 8, DEFAULT_ADDRSPACE); 1557 1558 if (getLexer().is(AsmToken::EndOfStatement)) 1559 break; 1560 1561 if (getLexer().isNot(AsmToken::Comma)) 1562 return TokError("unexpected token in directive"); 1563 Lex(); 1564 } 1565 } 1566 1567 Lex(); 1568 return false; 1569} 1570 1571/// ParseDirectiveSpace 1572/// ::= .space expression [ , expression ] 1573bool AsmParser::ParseDirectiveSpace() { 1574 CheckForValidSection(); 1575 1576 int64_t NumBytes; 1577 if (ParseAbsoluteExpression(NumBytes)) 1578 return true; 1579 1580 int64_t FillExpr = 0; 1581 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1582 if (getLexer().isNot(AsmToken::Comma)) 1583 return TokError("unexpected token in '.space' directive"); 1584 Lex(); 1585 1586 if (ParseAbsoluteExpression(FillExpr)) 1587 return true; 1588 1589 if (getLexer().isNot(AsmToken::EndOfStatement)) 1590 return TokError("unexpected token in '.space' directive"); 1591 } 1592 1593 Lex(); 1594 1595 if (NumBytes <= 0) 1596 return TokError("invalid number of bytes in '.space' directive"); 1597 1598 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. 1599 getStreamer().EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE); 1600 1601 return false; 1602} 1603 1604/// ParseDirectiveZero 1605/// ::= .zero expression 1606bool AsmParser::ParseDirectiveZero() { 1607 CheckForValidSection(); 1608 1609 int64_t NumBytes; 1610 if (ParseAbsoluteExpression(NumBytes)) 1611 return true; 1612 1613 int64_t Val = 0; 1614 if (getLexer().is(AsmToken::Comma)) { 1615 Lex(); 1616 if (ParseAbsoluteExpression(Val)) 1617 return true; 1618 } 1619 1620 if (getLexer().isNot(AsmToken::EndOfStatement)) 1621 return TokError("unexpected token in '.zero' directive"); 1622 1623 Lex(); 1624 1625 getStreamer().EmitFill(NumBytes, Val, DEFAULT_ADDRSPACE); 1626 1627 return false; 1628} 1629 1630/// ParseDirectiveFill 1631/// ::= .fill expression , expression , expression 1632bool AsmParser::ParseDirectiveFill() { 1633 CheckForValidSection(); 1634 1635 int64_t NumValues; 1636 if (ParseAbsoluteExpression(NumValues)) 1637 return true; 1638 1639 if (getLexer().isNot(AsmToken::Comma)) 1640 return TokError("unexpected token in '.fill' directive"); 1641 Lex(); 1642 1643 int64_t FillSize; 1644 if (ParseAbsoluteExpression(FillSize)) 1645 return true; 1646 1647 if (getLexer().isNot(AsmToken::Comma)) 1648 return TokError("unexpected token in '.fill' directive"); 1649 Lex(); 1650 1651 int64_t FillExpr; 1652 if (ParseAbsoluteExpression(FillExpr)) 1653 return true; 1654 1655 if (getLexer().isNot(AsmToken::EndOfStatement)) 1656 return TokError("unexpected token in '.fill' directive"); 1657 1658 Lex(); 1659 1660 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8) 1661 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8"); 1662 1663 for (uint64_t i = 0, e = NumValues; i != e; ++i) 1664 getStreamer().EmitIntValue(FillExpr, FillSize, DEFAULT_ADDRSPACE); 1665 1666 return false; 1667} 1668 1669/// ParseDirectiveOrg 1670/// ::= .org expression [ , expression ] 1671bool AsmParser::ParseDirectiveOrg() { 1672 CheckForValidSection(); 1673 1674 const MCExpr *Offset; 1675 if (ParseExpression(Offset)) 1676 return true; 1677 1678 // Parse optional fill expression. 1679 int64_t FillExpr = 0; 1680 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1681 if (getLexer().isNot(AsmToken::Comma)) 1682 return TokError("unexpected token in '.org' directive"); 1683 Lex(); 1684 1685 if (ParseAbsoluteExpression(FillExpr)) 1686 return true; 1687 1688 if (getLexer().isNot(AsmToken::EndOfStatement)) 1689 return TokError("unexpected token in '.org' directive"); 1690 } 1691 1692 Lex(); 1693 1694 // FIXME: Only limited forms of relocatable expressions are accepted here, it 1695 // has to be relative to the current section. 1696 getStreamer().EmitValueToOffset(Offset, FillExpr); 1697 1698 return false; 1699} 1700 1701/// ParseDirectiveAlign 1702/// ::= {.align, ...} expression [ , expression [ , expression ]] 1703bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) { 1704 CheckForValidSection(); 1705 1706 SMLoc AlignmentLoc = getLexer().getLoc(); 1707 int64_t Alignment; 1708 if (ParseAbsoluteExpression(Alignment)) 1709 return true; 1710 1711 SMLoc MaxBytesLoc; 1712 bool HasFillExpr = false; 1713 int64_t FillExpr = 0; 1714 int64_t MaxBytesToFill = 0; 1715 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1716 if (getLexer().isNot(AsmToken::Comma)) 1717 return TokError("unexpected token in directive"); 1718 Lex(); 1719 1720 // The fill expression can be omitted while specifying a maximum number of 1721 // alignment bytes, e.g: 1722 // .align 3,,4 1723 if (getLexer().isNot(AsmToken::Comma)) { 1724 HasFillExpr = true; 1725 if (ParseAbsoluteExpression(FillExpr)) 1726 return true; 1727 } 1728 1729 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1730 if (getLexer().isNot(AsmToken::Comma)) 1731 return TokError("unexpected token in directive"); 1732 Lex(); 1733 1734 MaxBytesLoc = getLexer().getLoc(); 1735 if (ParseAbsoluteExpression(MaxBytesToFill)) 1736 return true; 1737 1738 if (getLexer().isNot(AsmToken::EndOfStatement)) 1739 return TokError("unexpected token in directive"); 1740 } 1741 } 1742 1743 Lex(); 1744 1745 if (!HasFillExpr) 1746 FillExpr = 0; 1747 1748 // Compute alignment in bytes. 1749 if (IsPow2) { 1750 // FIXME: Diagnose overflow. 1751 if (Alignment >= 32) { 1752 Error(AlignmentLoc, "invalid alignment value"); 1753 Alignment = 31; 1754 } 1755 1756 Alignment = 1ULL << Alignment; 1757 } 1758 1759 // Diagnose non-sensical max bytes to align. 1760 if (MaxBytesLoc.isValid()) { 1761 if (MaxBytesToFill < 1) { 1762 Error(MaxBytesLoc, "alignment directive can never be satisfied in this " 1763 "many bytes, ignoring maximum bytes expression"); 1764 MaxBytesToFill = 0; 1765 } 1766 1767 if (MaxBytesToFill >= Alignment) { 1768 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " 1769 "has no effect"); 1770 MaxBytesToFill = 0; 1771 } 1772 } 1773 1774 // Check whether we should use optimal code alignment for this .align 1775 // directive. 1776 bool UseCodeAlign = getStreamer().getCurrentSection()->UseCodeAlign(); 1777 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) && 1778 ValueSize == 1 && UseCodeAlign) { 1779 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill); 1780 } else { 1781 // FIXME: Target specific behavior about how the "extra" bytes are filled. 1782 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize, 1783 MaxBytesToFill); 1784 } 1785 1786 return false; 1787} 1788 1789/// ParseDirectiveSymbolAttribute 1790/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] 1791bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) { 1792 if (getLexer().isNot(AsmToken::EndOfStatement)) { 1793 for (;;) { 1794 StringRef Name; 1795 1796 if (ParseIdentifier(Name)) 1797 return TokError("expected identifier in directive"); 1798 1799 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 1800 1801 getStreamer().EmitSymbolAttribute(Sym, Attr); 1802 1803 if (getLexer().is(AsmToken::EndOfStatement)) 1804 break; 1805 1806 if (getLexer().isNot(AsmToken::Comma)) 1807 return TokError("unexpected token in directive"); 1808 Lex(); 1809 } 1810 } 1811 1812 Lex(); 1813 return false; 1814} 1815 1816/// ParseDirectiveComm 1817/// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] 1818bool AsmParser::ParseDirectiveComm(bool IsLocal) { 1819 CheckForValidSection(); 1820 1821 SMLoc IDLoc = getLexer().getLoc(); 1822 StringRef Name; 1823 if (ParseIdentifier(Name)) 1824 return TokError("expected identifier in directive"); 1825 1826 // Handle the identifier as the key symbol. 1827 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 1828 1829 if (getLexer().isNot(AsmToken::Comma)) 1830 return TokError("unexpected token in directive"); 1831 Lex(); 1832 1833 int64_t Size; 1834 SMLoc SizeLoc = getLexer().getLoc(); 1835 if (ParseAbsoluteExpression(Size)) 1836 return true; 1837 1838 int64_t Pow2Alignment = 0; 1839 SMLoc Pow2AlignmentLoc; 1840 if (getLexer().is(AsmToken::Comma)) { 1841 Lex(); 1842 Pow2AlignmentLoc = getLexer().getLoc(); 1843 if (ParseAbsoluteExpression(Pow2Alignment)) 1844 return true; 1845 1846 // If this target takes alignments in bytes (not log) validate and convert. 1847 if (Lexer.getMAI().getAlignmentIsInBytes()) { 1848 if (!isPowerOf2_64(Pow2Alignment)) 1849 return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); 1850 Pow2Alignment = Log2_64(Pow2Alignment); 1851 } 1852 } 1853 1854 if (getLexer().isNot(AsmToken::EndOfStatement)) 1855 return TokError("unexpected token in '.comm' or '.lcomm' directive"); 1856 1857 Lex(); 1858 1859 // NOTE: a size of zero for a .comm should create a undefined symbol 1860 // but a size of .lcomm creates a bss symbol of size zero. 1861 if (Size < 0) 1862 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't " 1863 "be less than zero"); 1864 1865 // NOTE: The alignment in the directive is a power of 2 value, the assembler 1866 // may internally end up wanting an alignment in bytes. 1867 // FIXME: Diagnose overflow. 1868 if (Pow2Alignment < 0) 1869 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive " 1870 "alignment, can't be less than zero"); 1871 1872 if (!Sym->isUndefined()) 1873 return Error(IDLoc, "invalid symbol redefinition"); 1874 1875 // '.lcomm' is equivalent to '.zerofill'. 1876 // Create the Symbol as a common or local common with Size and Pow2Alignment 1877 if (IsLocal) { 1878 getStreamer().EmitZerofill(Ctx.getMachOSection( 1879 "__DATA", "__bss", MCSectionMachO::S_ZEROFILL, 1880 0, SectionKind::getBSS()), 1881 Sym, Size, 1 << Pow2Alignment); 1882 return false; 1883 } 1884 1885 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment); 1886 return false; 1887} 1888 1889/// ParseDirectiveAbort 1890/// ::= .abort [... message ...] 1891bool AsmParser::ParseDirectiveAbort() { 1892 // FIXME: Use loc from directive. 1893 SMLoc Loc = getLexer().getLoc(); 1894 1895 StringRef Str = ParseStringToEndOfStatement(); 1896 if (getLexer().isNot(AsmToken::EndOfStatement)) 1897 return TokError("unexpected token in '.abort' directive"); 1898 1899 Lex(); 1900 1901 if (Str.empty()) 1902 Error(Loc, ".abort detected. Assembly stopping."); 1903 else 1904 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping."); 1905 // FIXME: Actually abort assembly here. 1906 1907 return false; 1908} 1909 1910/// ParseDirectiveInclude 1911/// ::= .include "filename" 1912bool AsmParser::ParseDirectiveInclude() { 1913 if (getLexer().isNot(AsmToken::String)) 1914 return TokError("expected string in '.include' directive"); 1915 1916 std::string Filename = getTok().getString(); 1917 SMLoc IncludeLoc = getLexer().getLoc(); 1918 Lex(); 1919 1920 if (getLexer().isNot(AsmToken::EndOfStatement)) 1921 return TokError("unexpected token in '.include' directive"); 1922 1923 // Strip the quotes. 1924 Filename = Filename.substr(1, Filename.size()-2); 1925 1926 // Attempt to switch the lexer to the included file before consuming the end 1927 // of statement to avoid losing it when we switch. 1928 if (EnterIncludeFile(Filename)) { 1929 Error(IncludeLoc, "Could not find include file '" + Filename + "'"); 1930 return true; 1931 } 1932 1933 return false; 1934} 1935 1936/// ParseDirectiveIf 1937/// ::= .if expression 1938bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) { 1939 TheCondStack.push_back(TheCondState); 1940 TheCondState.TheCond = AsmCond::IfCond; 1941 if(TheCondState.Ignore) { 1942 EatToEndOfStatement(); 1943 } 1944 else { 1945 int64_t ExprValue; 1946 if (ParseAbsoluteExpression(ExprValue)) 1947 return true; 1948 1949 if (getLexer().isNot(AsmToken::EndOfStatement)) 1950 return TokError("unexpected token in '.if' directive"); 1951 1952 Lex(); 1953 1954 TheCondState.CondMet = ExprValue; 1955 TheCondState.Ignore = !TheCondState.CondMet; 1956 } 1957 1958 return false; 1959} 1960 1961bool AsmParser::ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { 1962 StringRef Name; 1963 TheCondStack.push_back(TheCondState); 1964 TheCondState.TheCond = AsmCond::IfCond; 1965 1966 if (TheCondState.Ignore) { 1967 EatToEndOfStatement(); 1968 } else { 1969 if (ParseIdentifier(Name)) 1970 return TokError("expected identifier after '.ifdef'"); 1971 1972 Lex(); 1973 1974 MCSymbol *Sym = getContext().LookupSymbol(Name); 1975 1976 if (expect_defined) 1977 TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined()); 1978 else 1979 TheCondState.CondMet = (Sym == NULL || Sym->isUndefined()); 1980 TheCondState.Ignore = !TheCondState.CondMet; 1981 } 1982 1983 return false; 1984} 1985 1986/// ParseDirectiveElseIf 1987/// ::= .elseif expression 1988bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) { 1989 if (TheCondState.TheCond != AsmCond::IfCond && 1990 TheCondState.TheCond != AsmCond::ElseIfCond) 1991 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or " 1992 " an .elseif"); 1993 TheCondState.TheCond = AsmCond::ElseIfCond; 1994 1995 bool LastIgnoreState = false; 1996 if (!TheCondStack.empty()) 1997 LastIgnoreState = TheCondStack.back().Ignore; 1998 if (LastIgnoreState || TheCondState.CondMet) { 1999 TheCondState.Ignore = true; 2000 EatToEndOfStatement(); 2001 } 2002 else { 2003 int64_t ExprValue; 2004 if (ParseAbsoluteExpression(ExprValue)) 2005 return true; 2006 2007 if (getLexer().isNot(AsmToken::EndOfStatement)) 2008 return TokError("unexpected token in '.elseif' directive"); 2009 2010 Lex(); 2011 TheCondState.CondMet = ExprValue; 2012 TheCondState.Ignore = !TheCondState.CondMet; 2013 } 2014 2015 return false; 2016} 2017 2018/// ParseDirectiveElse 2019/// ::= .else 2020bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) { 2021 if (getLexer().isNot(AsmToken::EndOfStatement)) 2022 return TokError("unexpected token in '.else' directive"); 2023 2024 Lex(); 2025 2026 if (TheCondState.TheCond != AsmCond::IfCond && 2027 TheCondState.TheCond != AsmCond::ElseIfCond) 2028 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an " 2029 ".elseif"); 2030 TheCondState.TheCond = AsmCond::ElseCond; 2031 bool LastIgnoreState = false; 2032 if (!TheCondStack.empty()) 2033 LastIgnoreState = TheCondStack.back().Ignore; 2034 if (LastIgnoreState || TheCondState.CondMet) 2035 TheCondState.Ignore = true; 2036 else 2037 TheCondState.Ignore = false; 2038 2039 return false; 2040} 2041 2042/// ParseDirectiveEndIf 2043/// ::= .endif 2044bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) { 2045 if (getLexer().isNot(AsmToken::EndOfStatement)) 2046 return TokError("unexpected token in '.endif' directive"); 2047 2048 Lex(); 2049 2050 if ((TheCondState.TheCond == AsmCond::NoCond) || 2051 TheCondStack.empty()) 2052 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or " 2053 ".else"); 2054 if (!TheCondStack.empty()) { 2055 TheCondState = TheCondStack.back(); 2056 TheCondStack.pop_back(); 2057 } 2058 2059 return false; 2060} 2061 2062/// ParseDirectiveFile 2063/// ::= .file [number] string 2064bool GenericAsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) { 2065 // FIXME: I'm not sure what this is. 2066 int64_t FileNumber = -1; 2067 SMLoc FileNumberLoc = getLexer().getLoc(); 2068 if (getLexer().is(AsmToken::Integer)) { 2069 FileNumber = getTok().getIntVal(); 2070 Lex(); 2071 2072 if (FileNumber < 1) 2073 return TokError("file number less than one"); 2074 } 2075 2076 if (getLexer().isNot(AsmToken::String)) 2077 return TokError("unexpected token in '.file' directive"); 2078 2079 StringRef Filename = getTok().getString(); 2080 Filename = Filename.substr(1, Filename.size()-2); 2081 Lex(); 2082 2083 if (getLexer().isNot(AsmToken::EndOfStatement)) 2084 return TokError("unexpected token in '.file' directive"); 2085 2086 if (FileNumber == -1) 2087 getStreamer().EmitFileDirective(Filename); 2088 else { 2089 if (getStreamer().EmitDwarfFileDirective(FileNumber, Filename)) 2090 Error(FileNumberLoc, "file number already allocated"); 2091 } 2092 2093 return false; 2094} 2095 2096/// ParseDirectiveLine 2097/// ::= .line [number] 2098bool GenericAsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) { 2099 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2100 if (getLexer().isNot(AsmToken::Integer)) 2101 return TokError("unexpected token in '.line' directive"); 2102 2103 int64_t LineNumber = getTok().getIntVal(); 2104 (void) LineNumber; 2105 Lex(); 2106 2107 // FIXME: Do something with the .line. 2108 } 2109 2110 if (getLexer().isNot(AsmToken::EndOfStatement)) 2111 return TokError("unexpected token in '.line' directive"); 2112 2113 return false; 2114} 2115 2116 2117/// ParseDirectiveLoc 2118/// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] 2119/// [epilogue_begin] [is_stmt VALUE] [isa VALUE] 2120/// The first number is a file number, must have been previously assigned with 2121/// a .file directive, the second number is the line number and optionally the 2122/// third number is a column position (zero if not specified). The remaining 2123/// optional items are .loc sub-directives. 2124bool GenericAsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) { 2125 2126 if (getLexer().isNot(AsmToken::Integer)) 2127 return TokError("unexpected token in '.loc' directive"); 2128 int64_t FileNumber = getTok().getIntVal(); 2129 if (FileNumber < 1) 2130 return TokError("file number less than one in '.loc' directive"); 2131 if (!getContext().isValidDwarfFileNumber(FileNumber)) 2132 return TokError("unassigned file number in '.loc' directive"); 2133 Lex(); 2134 2135 int64_t LineNumber = 0; 2136 if (getLexer().is(AsmToken::Integer)) { 2137 LineNumber = getTok().getIntVal(); 2138 if (LineNumber < 1) 2139 return TokError("line number less than one in '.loc' directive"); 2140 Lex(); 2141 } 2142 2143 int64_t ColumnPos = 0; 2144 if (getLexer().is(AsmToken::Integer)) { 2145 ColumnPos = getTok().getIntVal(); 2146 if (ColumnPos < 0) 2147 return TokError("column position less than zero in '.loc' directive"); 2148 Lex(); 2149 } 2150 2151 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; 2152 unsigned Isa = 0; 2153 int64_t Discriminator = 0; 2154 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2155 for (;;) { 2156 if (getLexer().is(AsmToken::EndOfStatement)) 2157 break; 2158 2159 StringRef Name; 2160 SMLoc Loc = getTok().getLoc(); 2161 if (getParser().ParseIdentifier(Name)) 2162 return TokError("unexpected token in '.loc' directive"); 2163 2164 if (Name == "basic_block") 2165 Flags |= DWARF2_FLAG_BASIC_BLOCK; 2166 else if (Name == "prologue_end") 2167 Flags |= DWARF2_FLAG_PROLOGUE_END; 2168 else if (Name == "epilogue_begin") 2169 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; 2170 else if (Name == "is_stmt") { 2171 SMLoc Loc = getTok().getLoc(); 2172 const MCExpr *Value; 2173 if (getParser().ParseExpression(Value)) 2174 return true; 2175 // The expression must be the constant 0 or 1. 2176 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 2177 int Value = MCE->getValue(); 2178 if (Value == 0) 2179 Flags &= ~DWARF2_FLAG_IS_STMT; 2180 else if (Value == 1) 2181 Flags |= DWARF2_FLAG_IS_STMT; 2182 else 2183 return Error(Loc, "is_stmt value not 0 or 1"); 2184 } 2185 else { 2186 return Error(Loc, "is_stmt value not the constant value of 0 or 1"); 2187 } 2188 } 2189 else if (Name == "isa") { 2190 SMLoc Loc = getTok().getLoc(); 2191 const MCExpr *Value; 2192 if (getParser().ParseExpression(Value)) 2193 return true; 2194 // The expression must be a constant greater or equal to 0. 2195 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 2196 int Value = MCE->getValue(); 2197 if (Value < 0) 2198 return Error(Loc, "isa number less than zero"); 2199 Isa = Value; 2200 } 2201 else { 2202 return Error(Loc, "isa number not a constant value"); 2203 } 2204 } 2205 else if (Name == "discriminator") { 2206 if (getParser().ParseAbsoluteExpression(Discriminator)) 2207 return true; 2208 } 2209 else { 2210 return Error(Loc, "unknown sub-directive in '.loc' directive"); 2211 } 2212 2213 if (getLexer().is(AsmToken::EndOfStatement)) 2214 break; 2215 } 2216 } 2217 2218 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, 2219 Isa, Discriminator); 2220 2221 return false; 2222} 2223 2224/// ParseDirectiveStabs 2225/// ::= .stabs string, number, number, number 2226bool GenericAsmParser::ParseDirectiveStabs(StringRef Directive, 2227 SMLoc DirectiveLoc) { 2228 return TokError("unsupported directive '" + Directive + "'"); 2229} 2230 2231/// ParseDirectiveCFIStartProc 2232/// ::= .cfi_startproc 2233bool GenericAsmParser::ParseDirectiveCFIStartProc(StringRef, 2234 SMLoc DirectiveLoc) { 2235 return getStreamer().EmitCFIStartProc(); 2236} 2237 2238/// ParseDirectiveCFIEndProc 2239/// ::= .cfi_endproc 2240bool GenericAsmParser::ParseDirectiveCFIEndProc(StringRef, SMLoc DirectiveLoc) { 2241 return getStreamer().EmitCFIEndProc(); 2242} 2243 2244/// ParseRegisterOrRegisterNumber - parse register name or number. 2245bool GenericAsmParser::ParseRegisterOrRegisterNumber(int64_t &Register, 2246 SMLoc DirectiveLoc) { 2247 unsigned RegNo; 2248 2249 if (getLexer().is(AsmToken::Percent)) { 2250 if (getParser().getTargetParser().ParseRegister(RegNo, DirectiveLoc, 2251 DirectiveLoc)) 2252 return true; 2253 Register = getContext().getTargetAsmInfo().getDwarfRegNum(RegNo, true); 2254 } else 2255 return getParser().ParseAbsoluteExpression(Register); 2256 2257 return false; 2258} 2259 2260/// ParseDirectiveCFIDefCfa 2261/// ::= .cfi_def_cfa register, offset 2262bool GenericAsmParser::ParseDirectiveCFIDefCfa(StringRef, 2263 SMLoc DirectiveLoc) { 2264 int64_t Register = 0; 2265 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2266 return true; 2267 2268 if (getLexer().isNot(AsmToken::Comma)) 2269 return TokError("unexpected token in directive"); 2270 Lex(); 2271 2272 int64_t Offset = 0; 2273 if (getParser().ParseAbsoluteExpression(Offset)) 2274 return true; 2275 2276 return getStreamer().EmitCFIDefCfa(Register, Offset); 2277} 2278 2279/// ParseDirectiveCFIDefCfaOffset 2280/// ::= .cfi_def_cfa_offset offset 2281bool GenericAsmParser::ParseDirectiveCFIDefCfaOffset(StringRef, 2282 SMLoc DirectiveLoc) { 2283 int64_t Offset = 0; 2284 if (getParser().ParseAbsoluteExpression(Offset)) 2285 return true; 2286 2287 return getStreamer().EmitCFIDefCfaOffset(Offset); 2288} 2289 2290/// ParseDirectiveCFIDefCfaRegister 2291/// ::= .cfi_def_cfa_register register 2292bool GenericAsmParser::ParseDirectiveCFIDefCfaRegister(StringRef, 2293 SMLoc DirectiveLoc) { 2294 int64_t Register = 0; 2295 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2296 return true; 2297 2298 return getStreamer().EmitCFIDefCfaRegister(Register); 2299} 2300 2301/// ParseDirectiveCFIOffset 2302/// ::= .cfi_off register, offset 2303bool GenericAsmParser::ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc) { 2304 int64_t Register = 0; 2305 int64_t Offset = 0; 2306 2307 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) 2308 return true; 2309 2310 if (getLexer().isNot(AsmToken::Comma)) 2311 return TokError("unexpected token in directive"); 2312 Lex(); 2313 2314 if (getParser().ParseAbsoluteExpression(Offset)) 2315 return true; 2316 2317 return getStreamer().EmitCFIOffset(Register, Offset); 2318} 2319 2320static bool isValidEncoding(int64_t Encoding) { 2321 if (Encoding & ~0xff) 2322 return false; 2323 2324 if (Encoding == dwarf::DW_EH_PE_omit) 2325 return true; 2326 2327 const unsigned Format = Encoding & 0xf; 2328 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && 2329 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && 2330 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && 2331 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) 2332 return false; 2333 2334 const unsigned Application = Encoding & 0x70; 2335 if (Application != dwarf::DW_EH_PE_absptr && 2336 Application != dwarf::DW_EH_PE_pcrel) 2337 return false; 2338 2339 return true; 2340} 2341 2342/// ParseDirectiveCFIPersonalityOrLsda 2343/// ::= .cfi_personality encoding, [symbol_name] 2344/// ::= .cfi_lsda encoding, [symbol_name] 2345bool GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda(StringRef IDVal, 2346 SMLoc DirectiveLoc) { 2347 int64_t Encoding = 0; 2348 if (getParser().ParseAbsoluteExpression(Encoding)) 2349 return true; 2350 if (Encoding == dwarf::DW_EH_PE_omit) 2351 return false; 2352 2353 if (!isValidEncoding(Encoding)) 2354 return TokError("unsupported encoding."); 2355 2356 if (getLexer().isNot(AsmToken::Comma)) 2357 return TokError("unexpected token in directive"); 2358 Lex(); 2359 2360 StringRef Name; 2361 if (getParser().ParseIdentifier(Name)) 2362 return TokError("expected identifier in directive"); 2363 2364 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 2365 2366 if (IDVal == ".cfi_personality") 2367 return getStreamer().EmitCFIPersonality(Sym, Encoding); 2368 else { 2369 assert(IDVal == ".cfi_lsda"); 2370 return getStreamer().EmitCFILsda(Sym, Encoding); 2371 } 2372} 2373 2374/// ParseDirectiveCFIRememberState 2375/// ::= .cfi_remember_state 2376bool GenericAsmParser::ParseDirectiveCFIRememberState(StringRef IDVal, 2377 SMLoc DirectiveLoc) { 2378 return getStreamer().EmitCFIRememberState(); 2379} 2380 2381/// ParseDirectiveCFIRestoreState 2382/// ::= .cfi_remember_state 2383bool GenericAsmParser::ParseDirectiveCFIRestoreState(StringRef IDVal, 2384 SMLoc DirectiveLoc) { 2385 return getStreamer().EmitCFIRestoreState(); 2386} 2387 2388/// ParseDirectiveMacrosOnOff 2389/// ::= .macros_on 2390/// ::= .macros_off 2391bool GenericAsmParser::ParseDirectiveMacrosOnOff(StringRef Directive, 2392 SMLoc DirectiveLoc) { 2393 if (getLexer().isNot(AsmToken::EndOfStatement)) 2394 return Error(getLexer().getLoc(), 2395 "unexpected token in '" + Directive + "' directive"); 2396 2397 getParser().MacrosEnabled = Directive == ".macros_on"; 2398 2399 return false; 2400} 2401 2402/// ParseDirectiveMacro 2403/// ::= .macro name 2404bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive, 2405 SMLoc DirectiveLoc) { 2406 StringRef Name; 2407 if (getParser().ParseIdentifier(Name)) 2408 return TokError("expected identifier in directive"); 2409 2410 if (getLexer().isNot(AsmToken::EndOfStatement)) 2411 return TokError("unexpected token in '.macro' directive"); 2412 2413 // Eat the end of statement. 2414 Lex(); 2415 2416 AsmToken EndToken, StartToken = getTok(); 2417 2418 // Lex the macro definition. 2419 for (;;) { 2420 // Check whether we have reached the end of the file. 2421 if (getLexer().is(AsmToken::Eof)) 2422 return Error(DirectiveLoc, "no matching '.endmacro' in definition"); 2423 2424 // Otherwise, check whether we have reach the .endmacro. 2425 if (getLexer().is(AsmToken::Identifier) && 2426 (getTok().getIdentifier() == ".endm" || 2427 getTok().getIdentifier() == ".endmacro")) { 2428 EndToken = getTok(); 2429 Lex(); 2430 if (getLexer().isNot(AsmToken::EndOfStatement)) 2431 return TokError("unexpected token in '" + EndToken.getIdentifier() + 2432 "' directive"); 2433 break; 2434 } 2435 2436 // Otherwise, scan til the end of the statement. 2437 getParser().EatToEndOfStatement(); 2438 } 2439 2440 if (getParser().MacroMap.lookup(Name)) { 2441 return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); 2442 } 2443 2444 const char *BodyStart = StartToken.getLoc().getPointer(); 2445 const char *BodyEnd = EndToken.getLoc().getPointer(); 2446 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 2447 getParser().MacroMap[Name] = new Macro(Name, Body); 2448 return false; 2449} 2450 2451/// ParseDirectiveEndMacro 2452/// ::= .endm 2453/// ::= .endmacro 2454bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive, 2455 SMLoc DirectiveLoc) { 2456 if (getLexer().isNot(AsmToken::EndOfStatement)) 2457 return TokError("unexpected token in '" + Directive + "' directive"); 2458 2459 // If we are inside a macro instantiation, terminate the current 2460 // instantiation. 2461 if (!getParser().ActiveMacros.empty()) { 2462 getParser().HandleMacroExit(); 2463 return false; 2464 } 2465 2466 // Otherwise, this .endmacro is a stray entry in the file; well formed 2467 // .endmacro directives are handled during the macro definition parsing. 2468 return TokError("unexpected '" + Directive + "' in file, " 2469 "no current macro definition"); 2470} 2471 2472bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) { 2473 getParser().CheckForValidSection(); 2474 2475 const MCExpr *Value; 2476 2477 if (getParser().ParseExpression(Value)) 2478 return true; 2479 2480 if (getLexer().isNot(AsmToken::EndOfStatement)) 2481 return TokError("unexpected token in directive"); 2482 2483 if (DirName[1] == 's') 2484 getStreamer().EmitSLEB128Value(Value); 2485 else 2486 getStreamer().EmitULEB128Value(Value); 2487 2488 return false; 2489} 2490 2491 2492/// \brief Create an MCAsmParser instance. 2493MCAsmParser *llvm::createMCAsmParser(const Target &T, SourceMgr &SM, 2494 MCContext &C, MCStreamer &Out, 2495 const MCAsmInfo &MAI) { 2496 return new AsmParser(T, SM, C, Out, MAI); 2497} 2498