1 //===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class implements the parser for assembly files.
12 //===----------------------------------------------------------------------===//
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/TargetAsmParser.h"
39 /// \brief Helper class for tracking macro definitions.
45 Macro(StringRef N, StringRef B) : Name(N), Body(B) {}
48 /// \brief Helper class for storing information about an active macro
50 struct MacroInstantiation {
51 /// The macro being instantiated.
52 const Macro *TheMacro;
54 /// The macro instantiation with substitutions.
55 MemoryBuffer *Instantiation;
57 /// The location of the instantiation.
58 SMLoc InstantiationLoc;
60 /// The location where parsing should resume upon instantiation completion.
64 MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL,
65 const std::vector<std::vector<AsmToken> > &A);
68 /// \brief The concrete assembly parser instance.
69 class AsmParser : public MCAsmParser {
70 friend class GenericAsmParser;
72 AsmParser(const AsmParser &); // DO NOT IMPLEMENT
73 void operator=(const AsmParser &); // DO NOT IMPLEMENT
79 MCAsmParserExtension *GenericParser;
80 MCAsmParserExtension *PlatformParser;
82 /// This is the current buffer index we're lexing from as managed by the
87 std::vector<AsmCond> TheCondStack;
89 /// DirectiveMap - This is a table handlers for directives. Each handler is
90 /// invoked after the directive identifier is read and is responsible for
91 /// parsing and validating the rest of the directive. The handler is passed
92 /// in the directive name and the location of the directive keyword.
93 StringMap<std::pair<MCAsmParserExtension*, DirectiveHandler> > DirectiveMap;
95 /// MacroMap - Map of currently defined macros.
96 StringMap<Macro*> MacroMap;
98 /// ActiveMacros - Stack of active macro instantiations.
99 std::vector<MacroInstantiation*> ActiveMacros;
101 /// Boolean tracking whether macro substitution is enabled.
102 unsigned MacrosEnabled : 1;
104 /// Flag tracking whether any errors have been encountered.
105 unsigned HadError : 1;
108 AsmParser(const Target &T, SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
109 const MCAsmInfo &MAI);
112 virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false);
114 void AddDirectiveHandler(MCAsmParserExtension *Object,
116 DirectiveHandler Handler) {
117 DirectiveMap[Directive] = std::make_pair(Object, Handler);
121 /// @name MCAsmParser Interface
124 virtual SourceMgr &getSourceManager() { return SrcMgr; }
125 virtual MCAsmLexer &getLexer() { return Lexer; }
126 virtual MCContext &getContext() { return Ctx; }
127 virtual MCStreamer &getStreamer() { return Out; }
129 virtual void Warning(SMLoc L, const Twine &Meg);
130 virtual bool Error(SMLoc L, const Twine &Msg);
132 const AsmToken &Lex();
134 bool ParseExpression(const MCExpr *&Res);
135 virtual bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc);
136 virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc);
137 virtual bool ParseAbsoluteExpression(int64_t &Res);
142 void CheckForValidSection();
144 bool ParseStatement();
146 bool HandleMacroEntry(StringRef Name, SMLoc NameLoc, const Macro *M);
147 void HandleMacroExit();
149 void PrintMacroInstantiations();
150 void PrintMessage(SMLoc Loc, const Twine &Msg, const char *Type) const {
151 SrcMgr.PrintMessage(Loc, Msg, Type);
154 /// EnterIncludeFile - Enter the specified file. This returns true on failure.
155 bool EnterIncludeFile(const std::string &Filename);
157 /// \brief Reset the current lexer position to that given by \arg Loc. The
158 /// current token is not set; clients should ensure Lex() is called
160 void JumpToLoc(SMLoc Loc);
162 void EatToEndOfStatement();
164 /// \brief Parse up to the end of statement and a return the contents from the
165 /// current token until the end of the statement; the current token on exit
166 /// will be either the EndOfStatement or EOF.
167 StringRef ParseStringToEndOfStatement();
169 bool ParseAssignment(StringRef Name);
171 bool ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc);
172 bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
173 bool ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
175 /// ParseIdentifier - Parse an identifier or string (as a quoted identifier)
176 /// and set \arg Res to the identifier contents.
177 bool ParseIdentifier(StringRef &Res);
179 // Directive Parsing.
181 // ".ascii", ".asciiz", ".string"
182 bool ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
183 bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ...
184 bool ParseDirectiveRealValue(const fltSemantics &); // ".single", ...
185 bool ParseDirectiveFill(); // ".fill"
186 bool ParseDirectiveSpace(); // ".space"
187 bool ParseDirectiveZero(); // ".zero"
188 bool ParseDirectiveSet(StringRef IDVal); // ".set" or ".equ"
189 bool ParseDirectiveOrg(); // ".org"
190 // ".align{,32}", ".p2align{,w,l}"
191 bool ParseDirectiveAlign(bool IsPow2, unsigned ValueSize);
193 /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
194 /// accepts a single symbol (which should be a label or an external).
195 bool ParseDirectiveSymbolAttribute(MCSymbolAttr Attr);
197 bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
199 bool ParseDirectiveAbort(); // ".abort"
200 bool ParseDirectiveInclude(); // ".include"
202 bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if"
203 bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
204 bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else"
205 bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
207 /// ParseEscapedString - Parse the current token as a string which may include
208 /// escaped characters and return the string contents.
209 bool ParseEscapedString(std::string &Data);
211 const MCExpr *ApplyModifierToExpr(const MCExpr *E,
212 MCSymbolRefExpr::VariantKind Variant);
215 /// \brief Generic implementations of directive handling, etc. which is shared
216 /// (or the default, at least) for all assembler parser.
217 class GenericAsmParser : public MCAsmParserExtension {
218 template<bool (GenericAsmParser::*Handler)(StringRef, SMLoc)>
219 void AddDirectiveHandler(StringRef Directive) {
220 getParser().AddDirectiveHandler(this, Directive,
221 HandleDirective<GenericAsmParser, Handler>);
225 GenericAsmParser() {}
227 AsmParser &getParser() {
228 return (AsmParser&) this->MCAsmParserExtension::getParser();
231 virtual void Initialize(MCAsmParser &Parser) {
232 // Call the base implementation.
233 this->MCAsmParserExtension::Initialize(Parser);
235 // Debugging directives.
236 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveFile>(".file");
237 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLine>(".line");
238 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLoc>(".loc");
239 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveStabs>(".stabs");
242 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIStartProc>(
244 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIEndProc>(
246 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfaOffset>(
247 ".cfi_def_cfa_offset");
248 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfaRegister>(
249 ".cfi_def_cfa_register");
250 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIOffset>(
253 &GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_personality");
255 &GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_lsda");
258 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
260 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
262 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacro>(".macro");
263 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endm");
264 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endmacro");
266 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".sleb128");
267 AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".uleb128");
270 bool ParseDirectiveFile(StringRef, SMLoc DirectiveLoc);
271 bool ParseDirectiveLine(StringRef, SMLoc DirectiveLoc);
272 bool ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc);
273 bool ParseDirectiveStabs(StringRef, SMLoc DirectiveLoc);
274 bool ParseDirectiveCFIStartProc(StringRef, SMLoc DirectiveLoc);
275 bool ParseDirectiveCFIEndProc(StringRef, SMLoc DirectiveLoc);
276 bool ParseDirectiveCFIDefCfaOffset(StringRef, SMLoc DirectiveLoc);
277 bool ParseDirectiveCFIDefCfaRegister(StringRef, SMLoc DirectiveLoc);
278 bool ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc);
279 bool ParseDirectiveCFIPersonalityOrLsda(StringRef, SMLoc DirectiveLoc);
281 bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
282 bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
283 bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc);
285 bool ParseDirectiveLEB128(StringRef, SMLoc);
292 extern MCAsmParserExtension *createDarwinAsmParser();
293 extern MCAsmParserExtension *createELFAsmParser();
294 extern MCAsmParserExtension *createCOFFAsmParser();
298 enum { DEFAULT_ADDRSPACE = 0 };
300 AsmParser::AsmParser(const Target &T, SourceMgr &_SM, MCContext &_Ctx,
301 MCStreamer &_Out, const MCAsmInfo &_MAI)
302 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), SrcMgr(_SM),
303 GenericParser(new GenericAsmParser), PlatformParser(0),
304 CurBuffer(0), MacrosEnabled(true) {
305 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
307 // Initialize the generic parser.
308 GenericParser->Initialize(*this);
310 // Initialize the platform / file format parser.
312 // FIXME: This is a hack, we need to (majorly) cleanup how these objects are
314 if (_MAI.hasMicrosoftFastStdCallMangling()) {
315 PlatformParser = createCOFFAsmParser();
316 PlatformParser->Initialize(*this);
317 } else if (_MAI.hasSubsectionsViaSymbols()) {
318 PlatformParser = createDarwinAsmParser();
319 PlatformParser->Initialize(*this);
321 PlatformParser = createELFAsmParser();
322 PlatformParser->Initialize(*this);
326 AsmParser::~AsmParser() {
327 assert(ActiveMacros.empty() && "Unexpected active macro instantiation!");
329 // Destroy any macros.
330 for (StringMap<Macro*>::iterator it = MacroMap.begin(),
331 ie = MacroMap.end(); it != ie; ++it)
332 delete it->getValue();
334 delete PlatformParser;
335 delete GenericParser;
338 void AsmParser::PrintMacroInstantiations() {
339 // Print the active macro instantiation stack.
340 for (std::vector<MacroInstantiation*>::const_reverse_iterator
341 it = ActiveMacros.rbegin(), ie = ActiveMacros.rend(); it != ie; ++it)
342 PrintMessage((*it)->InstantiationLoc, "while in macro instantiation",
346 void AsmParser::Warning(SMLoc L, const Twine &Msg) {
347 PrintMessage(L, Msg, "warning");
348 PrintMacroInstantiations();
351 bool AsmParser::Error(SMLoc L, const Twine &Msg) {
353 PrintMessage(L, Msg, "error");
354 PrintMacroInstantiations();
358 bool AsmParser::EnterIncludeFile(const std::string &Filename) {
359 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc());
365 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
370 void AsmParser::JumpToLoc(SMLoc Loc) {
371 CurBuffer = SrcMgr.FindBufferContainingLoc(Loc);
372 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer());
375 const AsmToken &AsmParser::Lex() {
376 const AsmToken *tok = &Lexer.Lex();
378 if (tok->is(AsmToken::Eof)) {
379 // If this is the end of an included file, pop the parent file off the
381 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
382 if (ParentIncludeLoc != SMLoc()) {
383 JumpToLoc(ParentIncludeLoc);
388 if (tok->is(AsmToken::Error))
389 Error(Lexer.getErrLoc(), Lexer.getErr());
394 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
395 // Create the initial section, if requested.
396 if (!NoInitialTextSection)
403 AsmCond StartingCondState = TheCondState;
405 // While we have input, parse each statement.
406 while (Lexer.isNot(AsmToken::Eof)) {
407 if (!ParseStatement()) continue;
409 // We had an error, validate that one was emitted and recover by skipping to
411 assert(HadError && "Parse statement returned an error, but none emitted!");
412 EatToEndOfStatement();
415 if (TheCondState.TheCond != StartingCondState.TheCond ||
416 TheCondState.Ignore != StartingCondState.Ignore)
417 return TokError("unmatched .ifs or .elses");
419 // Check to see there are no empty DwarfFile slots.
420 const std::vector<MCDwarfFile *> &MCDwarfFiles =
421 getContext().getMCDwarfFiles();
422 for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
423 if (!MCDwarfFiles[i])
424 TokError("unassigned file number: " + Twine(i) + " for .file directives");
427 // Finalize the output stream if there are no errors and if the client wants
429 if (!HadError && !NoFinalize)
435 void AsmParser::CheckForValidSection() {
436 if (!getStreamer().getCurrentSection()) {
437 TokError("expected section directive before assembly directive");
438 Out.SwitchSection(Ctx.getMachOSection(
440 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
441 0, SectionKind::getText()));
445 /// EatToEndOfStatement - Throw away the rest of the line for testing purposes.
446 void AsmParser::EatToEndOfStatement() {
447 while (Lexer.isNot(AsmToken::EndOfStatement) &&
448 Lexer.isNot(AsmToken::Eof))
452 if (Lexer.is(AsmToken::EndOfStatement))
456 StringRef AsmParser::ParseStringToEndOfStatement() {
457 const char *Start = getTok().getLoc().getPointer();
459 while (Lexer.isNot(AsmToken::EndOfStatement) &&
460 Lexer.isNot(AsmToken::Eof))
463 const char *End = getTok().getLoc().getPointer();
464 return StringRef(Start, End - Start);
467 /// ParseParenExpr - Parse a paren expression and return it.
468 /// NOTE: This assumes the leading '(' has already been consumed.
470 /// parenexpr ::= expr)
472 bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
473 if (ParseExpression(Res)) return true;
474 if (Lexer.isNot(AsmToken::RParen))
475 return TokError("expected ')' in parentheses expression");
476 EndLoc = Lexer.getLoc();
481 /// ParsePrimaryExpr - Parse a primary expression and return it.
482 /// primaryexpr ::= (parenexpr
483 /// primaryexpr ::= symbol
484 /// primaryexpr ::= number
485 /// primaryexpr ::= '.'
486 /// primaryexpr ::= ~,+,- primaryexpr
487 bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
488 switch (Lexer.getKind()) {
490 return TokError("unknown token in expression");
491 case AsmToken::Exclaim:
492 Lex(); // Eat the operator.
493 if (ParsePrimaryExpr(Res, EndLoc))
495 Res = MCUnaryExpr::CreateLNot(Res, getContext());
497 case AsmToken::Dollar:
498 case AsmToken::String:
499 case AsmToken::Identifier: {
500 EndLoc = Lexer.getLoc();
502 StringRef Identifier;
503 if (ParseIdentifier(Identifier))
506 // This is a symbol reference.
507 std::pair<StringRef, StringRef> Split = Identifier.split('@');
508 MCSymbol *Sym = getContext().GetOrCreateSymbol(Split.first);
510 // Lookup the symbol variant if used.
511 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
512 if (Split.first.size() != Identifier.size()) {
513 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
514 if (Variant == MCSymbolRefExpr::VK_Invalid) {
515 Variant = MCSymbolRefExpr::VK_None;
516 TokError("invalid variant '" + Split.second + "'");
520 // If this is an absolute variable reference, substitute it now to preserve
521 // semantics in the face of reassignment.
522 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
524 return Error(EndLoc, "unexpected modifier on variable reference");
526 Res = Sym->getVariableValue();
530 // Otherwise create a symbol ref.
531 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
534 case AsmToken::Integer: {
535 SMLoc Loc = getTok().getLoc();
536 int64_t IntVal = getTok().getIntVal();
537 Res = MCConstantExpr::Create(IntVal, getContext());
538 EndLoc = Lexer.getLoc();
540 // Look for 'b' or 'f' following an Integer as a directional label
541 if (Lexer.getKind() == AsmToken::Identifier) {
542 StringRef IDVal = getTok().getString();
543 if (IDVal == "f" || IDVal == "b"){
544 MCSymbol *Sym = Ctx.GetDirectionalLocalSymbol(IntVal,
545 IDVal == "f" ? 1 : 0);
546 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None,
548 if(IDVal == "b" && Sym->isUndefined())
549 return Error(Loc, "invalid reference to undefined symbol");
550 EndLoc = Lexer.getLoc();
551 Lex(); // Eat identifier.
556 case AsmToken::Dot: {
557 // This is a '.' reference, which references the current PC. Emit a
558 // temporary label to the streamer and refer to it.
559 MCSymbol *Sym = Ctx.CreateTempSymbol();
561 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
562 EndLoc = Lexer.getLoc();
563 Lex(); // Eat identifier.
567 case AsmToken::LParen:
568 Lex(); // Eat the '('.
569 return ParseParenExpr(Res, EndLoc);
570 case AsmToken::Minus:
571 Lex(); // Eat the operator.
572 if (ParsePrimaryExpr(Res, EndLoc))
574 Res = MCUnaryExpr::CreateMinus(Res, getContext());
577 Lex(); // Eat the operator.
578 if (ParsePrimaryExpr(Res, EndLoc))
580 Res = MCUnaryExpr::CreatePlus(Res, getContext());
582 case AsmToken::Tilde:
583 Lex(); // Eat the operator.
584 if (ParsePrimaryExpr(Res, EndLoc))
586 Res = MCUnaryExpr::CreateNot(Res, getContext());
591 bool AsmParser::ParseExpression(const MCExpr *&Res) {
593 return ParseExpression(Res, EndLoc);
597 AsmParser::ApplyModifierToExpr(const MCExpr *E,
598 MCSymbolRefExpr::VariantKind Variant) {
599 // Recurse over the given expression, rebuilding it to apply the given variant
600 // if there is exactly one symbol.
601 switch (E->getKind()) {
603 case MCExpr::Constant:
606 case MCExpr::SymbolRef: {
607 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
609 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
610 TokError("invalid variant on expression '" +
611 getTok().getIdentifier() + "' (already modified)");
615 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext());
618 case MCExpr::Unary: {
619 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
620 const MCExpr *Sub = ApplyModifierToExpr(UE->getSubExpr(), Variant);
623 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext());
626 case MCExpr::Binary: {
627 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
628 const MCExpr *LHS = ApplyModifierToExpr(BE->getLHS(), Variant);
629 const MCExpr *RHS = ApplyModifierToExpr(BE->getRHS(), Variant);
634 if (!LHS) LHS = BE->getLHS();
635 if (!RHS) RHS = BE->getRHS();
637 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext());
641 assert(0 && "Invalid expression kind!");
645 /// ParseExpression - Parse an expression and return it.
647 /// expr ::= expr +,- expr -> lowest.
648 /// expr ::= expr |,^,&,! expr -> middle.
649 /// expr ::= expr *,/,%,<<,>> expr -> highest.
650 /// expr ::= primaryexpr
652 bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
653 // Parse the expression.
655 if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
658 // As a special case, we support 'a op b @ modifier' by rewriting the
659 // expression to include the modifier. This is inefficient, but in general we
660 // expect users to use 'a@modifier op b'.
661 if (Lexer.getKind() == AsmToken::At) {
664 if (Lexer.isNot(AsmToken::Identifier))
665 return TokError("unexpected symbol modifier following '@'");
667 MCSymbolRefExpr::VariantKind Variant =
668 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
669 if (Variant == MCSymbolRefExpr::VK_Invalid)
670 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
672 const MCExpr *ModifiedRes = ApplyModifierToExpr(Res, Variant);
674 return TokError("invalid modifier '" + getTok().getIdentifier() +
675 "' (no symbols present)");
683 // Try to constant fold it up front, if possible.
685 if (Res->EvaluateAsAbsolute(Value))
686 Res = MCConstantExpr::Create(Value, getContext());
691 bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
693 return ParseParenExpr(Res, EndLoc) ||
694 ParseBinOpRHS(1, Res, EndLoc);
697 bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
700 SMLoc StartLoc = Lexer.getLoc();
701 if (ParseExpression(Expr))
704 if (!Expr->EvaluateAsAbsolute(Res))
705 return Error(StartLoc, "expected absolute expression");
710 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
711 MCBinaryExpr::Opcode &Kind) {
714 return 0; // not a binop.
716 // Lowest Precedence: &&, ||, @
717 case AsmToken::AmpAmp:
718 Kind = MCBinaryExpr::LAnd;
720 case AsmToken::PipePipe:
721 Kind = MCBinaryExpr::LOr;
725 // Low Precedence: |, &, ^
727 // FIXME: gas seems to support '!' as an infix operator?
729 Kind = MCBinaryExpr::Or;
731 case AsmToken::Caret:
732 Kind = MCBinaryExpr::Xor;
735 Kind = MCBinaryExpr::And;
738 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
739 case AsmToken::EqualEqual:
740 Kind = MCBinaryExpr::EQ;
742 case AsmToken::ExclaimEqual:
743 case AsmToken::LessGreater:
744 Kind = MCBinaryExpr::NE;
747 Kind = MCBinaryExpr::LT;
749 case AsmToken::LessEqual:
750 Kind = MCBinaryExpr::LTE;
752 case AsmToken::Greater:
753 Kind = MCBinaryExpr::GT;
755 case AsmToken::GreaterEqual:
756 Kind = MCBinaryExpr::GTE;
759 // High Intermediate Precedence: +, -
761 Kind = MCBinaryExpr::Add;
763 case AsmToken::Minus:
764 Kind = MCBinaryExpr::Sub;
767 // Highest Precedence: *, /, %, <<, >>
769 Kind = MCBinaryExpr::Mul;
771 case AsmToken::Slash:
772 Kind = MCBinaryExpr::Div;
774 case AsmToken::Percent:
775 Kind = MCBinaryExpr::Mod;
777 case AsmToken::LessLess:
778 Kind = MCBinaryExpr::Shl;
780 case AsmToken::GreaterGreater:
781 Kind = MCBinaryExpr::Shr;
787 /// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
788 /// Res contains the LHS of the expression on input.
789 bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
792 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
793 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
795 // If the next token is lower precedence than we are allowed to eat, return
796 // successfully with what we ate already.
797 if (TokPrec < Precedence)
802 // Eat the next primary expression.
804 if (ParsePrimaryExpr(RHS, EndLoc)) return true;
806 // If BinOp binds less tightly with RHS than the operator after RHS, let
807 // the pending operator take RHS as its LHS.
808 MCBinaryExpr::Opcode Dummy;
809 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
810 if (TokPrec < NextTokPrec) {
811 if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true;
814 // Merge LHS and RHS according to operator.
815 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
823 /// ::= EndOfStatement
824 /// ::= Label* Directive ...Operands... EndOfStatement
825 /// ::= Label* Identifier OperandList* EndOfStatement
826 bool AsmParser::ParseStatement() {
827 if (Lexer.is(AsmToken::EndOfStatement)) {
833 // Statements always start with an identifier.
834 AsmToken ID = getTok();
835 SMLoc IDLoc = ID.getLoc();
837 int64_t LocalLabelVal = -1;
838 // GUESS allow an integer followed by a ':' as a directional local label
839 if (Lexer.is(AsmToken::Integer)) {
840 LocalLabelVal = getTok().getIntVal();
841 if (LocalLabelVal < 0) {
842 if (!TheCondState.Ignore)
843 return TokError("unexpected token at start of statement");
847 IDVal = getTok().getString();
848 Lex(); // Consume the integer token to be used as an identifier token.
849 if (Lexer.getKind() != AsmToken::Colon) {
850 if (!TheCondState.Ignore)
851 return TokError("unexpected token at start of statement");
855 else if (ParseIdentifier(IDVal)) {
856 if (!TheCondState.Ignore)
857 return TokError("unexpected token at start of statement");
861 // Handle conditional assembly here before checking for skipping. We
862 // have to do this so that .endif isn't skipped in a ".if 0" block for
865 return ParseDirectiveIf(IDLoc);
866 if (IDVal == ".elseif")
867 return ParseDirectiveElseIf(IDLoc);
868 if (IDVal == ".else")
869 return ParseDirectiveElse(IDLoc);
870 if (IDVal == ".endif")
871 return ParseDirectiveEndIf(IDLoc);
873 // If we are in a ".if 0" block, ignore this statement.
874 if (TheCondState.Ignore) {
875 EatToEndOfStatement();
879 // FIXME: Recurse on local labels?
881 // See what kind of statement we have.
882 switch (Lexer.getKind()) {
883 case AsmToken::Colon: {
884 CheckForValidSection();
886 // identifier ':' -> Label.
889 // Diagnose attempt to use a variable as a label.
891 // FIXME: Diagnostics. Note the location of the definition as a label.
892 // FIXME: This doesn't diagnose assignment to a symbol which has been
893 // implicitly marked as external.
895 if (LocalLabelVal == -1)
896 Sym = getContext().GetOrCreateSymbol(IDVal);
898 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
899 if (!Sym->isUndefined() || Sym->isVariable())
900 return Error(IDLoc, "invalid symbol redefinition");
905 // Consume any end of statement token, if present, to avoid spurious
906 // AddBlankLine calls().
907 if (Lexer.is(AsmToken::EndOfStatement)) {
909 if (Lexer.is(AsmToken::Eof))
913 return ParseStatement();
916 case AsmToken::Equal:
917 // identifier '=' ... -> assignment statement
920 return ParseAssignment(IDVal);
922 default: // Normal instruction or directive.
926 // If macros are enabled, check to see if this is a macro instantiation.
928 if (const Macro *M = MacroMap.lookup(IDVal))
929 return HandleMacroEntry(IDVal, IDLoc, M);
931 // Otherwise, we have a normal instruction or directive.
932 if (IDVal[0] == '.') {
933 // Assembler features
934 if (IDVal == ".set" || IDVal == ".equ")
935 return ParseDirectiveSet(IDVal);
939 if (IDVal == ".ascii")
940 return ParseDirectiveAscii(IDVal, false);
941 if (IDVal == ".asciz" || IDVal == ".string")
942 return ParseDirectiveAscii(IDVal, true);
944 if (IDVal == ".byte")
945 return ParseDirectiveValue(1);
946 if (IDVal == ".short")
947 return ParseDirectiveValue(2);
948 if (IDVal == ".value")
949 return ParseDirectiveValue(2);
950 if (IDVal == ".long")
951 return ParseDirectiveValue(4);
952 if (IDVal == ".quad")
953 return ParseDirectiveValue(8);
954 if (IDVal == ".single")
955 return ParseDirectiveRealValue(APFloat::IEEEsingle);
956 if (IDVal == ".double")
957 return ParseDirectiveRealValue(APFloat::IEEEdouble);
959 if (IDVal == ".align") {
960 bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes();
961 return ParseDirectiveAlign(IsPow2, /*ExprSize=*/1);
963 if (IDVal == ".align32") {
964 bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes();
965 return ParseDirectiveAlign(IsPow2, /*ExprSize=*/4);
967 if (IDVal == ".balign")
968 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
969 if (IDVal == ".balignw")
970 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
971 if (IDVal == ".balignl")
972 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
973 if (IDVal == ".p2align")
974 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
975 if (IDVal == ".p2alignw")
976 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
977 if (IDVal == ".p2alignl")
978 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
981 return ParseDirectiveOrg();
983 if (IDVal == ".fill")
984 return ParseDirectiveFill();
985 if (IDVal == ".space")
986 return ParseDirectiveSpace();
987 if (IDVal == ".zero")
988 return ParseDirectiveZero();
990 // Symbol attribute directives
992 if (IDVal == ".globl" || IDVal == ".global")
993 return ParseDirectiveSymbolAttribute(MCSA_Global);
994 // ELF only? Should it be here?
995 if (IDVal == ".local")
996 return ParseDirectiveSymbolAttribute(MCSA_Local);
997 if (IDVal == ".hidden")
998 return ParseDirectiveSymbolAttribute(MCSA_Hidden);
999 if (IDVal == ".indirect_symbol")
1000 return ParseDirectiveSymbolAttribute(MCSA_IndirectSymbol);
1001 if (IDVal == ".internal")
1002 return ParseDirectiveSymbolAttribute(MCSA_Internal);
1003 if (IDVal == ".lazy_reference")
1004 return ParseDirectiveSymbolAttribute(MCSA_LazyReference);
1005 if (IDVal == ".no_dead_strip")
1006 return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1007 if (IDVal == ".private_extern")
1008 return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1009 if (IDVal == ".protected")
1010 return ParseDirectiveSymbolAttribute(MCSA_Protected);
1011 if (IDVal == ".reference")
1012 return ParseDirectiveSymbolAttribute(MCSA_Reference);
1013 if (IDVal == ".weak")
1014 return ParseDirectiveSymbolAttribute(MCSA_Weak);
1015 if (IDVal == ".weak_definition")
1016 return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1017 if (IDVal == ".weak_reference")
1018 return ParseDirectiveSymbolAttribute(MCSA_WeakReference);
1019 if (IDVal == ".weak_def_can_be_hidden")
1020 return ParseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1022 if (IDVal == ".comm")
1023 return ParseDirectiveComm(/*IsLocal=*/false);
1024 if (IDVal == ".lcomm")
1025 return ParseDirectiveComm(/*IsLocal=*/true);
1027 if (IDVal == ".abort")
1028 return ParseDirectiveAbort();
1029 if (IDVal == ".include")
1030 return ParseDirectiveInclude();
1032 // Look up the handler in the handler table.
1033 std::pair<MCAsmParserExtension*, DirectiveHandler> Handler =
1034 DirectiveMap.lookup(IDVal);
1036 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1038 // Target hook for parsing target specific directives.
1039 if (!getTargetParser().ParseDirective(ID))
1042 Warning(IDLoc, "ignoring directive for now");
1043 EatToEndOfStatement();
1047 CheckForValidSection();
1049 // Canonicalize the opcode to lower case.
1050 SmallString<128> Opcode;
1051 for (unsigned i = 0, e = IDVal.size(); i != e; ++i)
1052 Opcode.push_back(tolower(IDVal[i]));
1054 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
1055 bool HadError = getTargetParser().ParseInstruction(Opcode.str(), IDLoc,
1058 // Dump the parsed representation, if requested.
1059 if (getShowParsedOperands()) {
1060 SmallString<256> Str;
1061 raw_svector_ostream OS(Str);
1062 OS << "parsed instruction: [";
1063 for (unsigned i = 0; i != ParsedOperands.size(); ++i) {
1066 ParsedOperands[i]->dump(OS);
1070 PrintMessage(IDLoc, OS.str(), "note");
1073 // If parsing succeeded, match the instruction.
1075 HadError = getTargetParser().MatchAndEmitInstruction(IDLoc, ParsedOperands,
1078 // Free any parsed operands.
1079 for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
1080 delete ParsedOperands[i];
1082 // Don't skip the rest of the line, the instruction parser is responsible for
1087 MacroInstantiation::MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL,
1088 const std::vector<std::vector<AsmToken> > &A)
1089 : TheMacro(M), InstantiationLoc(IL), ExitLoc(EL)
1091 // Macro instantiation is lexical, unfortunately. We construct a new buffer
1092 // to hold the macro body with substitutions.
1093 SmallString<256> Buf;
1094 raw_svector_ostream OS(Buf);
1096 StringRef Body = M->Body;
1097 while (!Body.empty()) {
1098 // Scan for the next substitution.
1099 std::size_t End = Body.size(), Pos = 0;
1100 for (; Pos != End; ++Pos) {
1101 // Check for a substitution or escape.
1102 if (Body[Pos] != '$' || Pos + 1 == End)
1105 char Next = Body[Pos + 1];
1106 if (Next == '$' || Next == 'n' || isdigit(Next))
1111 OS << Body.slice(0, Pos);
1113 // Check if we reached the end.
1117 switch (Body[Pos+1]) {
1123 // $n => number of arguments
1128 // $[0-9] => argument
1130 // Missing arguments are ignored.
1131 unsigned Index = Body[Pos+1] - '0';
1132 if (Index >= A.size())
1135 // Otherwise substitute with the token values, with spaces eliminated.
1136 for (std::vector<AsmToken>::const_iterator it = A[Index].begin(),
1137 ie = A[Index].end(); it != ie; ++it)
1138 OS << it->getString();
1143 // Update the scan point.
1144 Body = Body.substr(Pos + 2);
1147 // We include the .endmacro in the buffer as our queue to exit the macro
1149 OS << ".endmacro\n";
1151 Instantiation = MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
1154 bool AsmParser::HandleMacroEntry(StringRef Name, SMLoc NameLoc,
1156 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
1157 // this, although we should protect against infinite loops.
1158 if (ActiveMacros.size() == 20)
1159 return TokError("macros cannot be nested more than 20 levels deep");
1161 // Parse the macro instantiation arguments.
1162 std::vector<std::vector<AsmToken> > MacroArguments;
1163 MacroArguments.push_back(std::vector<AsmToken>());
1164 unsigned ParenLevel = 0;
1166 if (Lexer.is(AsmToken::Eof))
1167 return TokError("unexpected token in macro instantiation");
1168 if (Lexer.is(AsmToken::EndOfStatement))
1171 // If we aren't inside parentheses and this is a comma, start a new token
1173 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) {
1174 MacroArguments.push_back(std::vector<AsmToken>());
1176 // Adjust the current parentheses level.
1177 if (Lexer.is(AsmToken::LParen))
1179 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
1182 // Append the token to the current argument list.
1183 MacroArguments.back().push_back(getTok());
1188 // Create the macro instantiation object and add to the current macro
1189 // instantiation stack.
1190 MacroInstantiation *MI = new MacroInstantiation(M, NameLoc,
1193 ActiveMacros.push_back(MI);
1195 // Jump to the macro instantiation and prime the lexer.
1196 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
1197 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
1203 void AsmParser::HandleMacroExit() {
1204 // Jump to the EndOfStatement we should return to, and consume it.
1205 JumpToLoc(ActiveMacros.back()->ExitLoc);
1208 // Pop the instantiation entry.
1209 delete ActiveMacros.back();
1210 ActiveMacros.pop_back();
1213 static void MarkUsed(const MCExpr *Value) {
1214 switch (Value->getKind()) {
1215 case MCExpr::Binary:
1216 MarkUsed(static_cast<const MCBinaryExpr*>(Value)->getLHS());
1217 MarkUsed(static_cast<const MCBinaryExpr*>(Value)->getRHS());
1219 case MCExpr::Target:
1220 case MCExpr::Constant:
1222 case MCExpr::SymbolRef: {
1223 static_cast<const MCSymbolRefExpr*>(Value)->getSymbol().setUsed(true);
1227 MarkUsed(static_cast<const MCUnaryExpr*>(Value)->getSubExpr());
1232 bool AsmParser::ParseAssignment(StringRef Name) {
1233 // FIXME: Use better location, we should use proper tokens.
1234 SMLoc EqualLoc = Lexer.getLoc();
1236 const MCExpr *Value;
1237 if (ParseExpression(Value))
1242 if (Lexer.isNot(AsmToken::EndOfStatement))
1243 return TokError("unexpected token in assignment");
1245 // Eat the end of statement marker.
1248 // Validate that the LHS is allowed to be a variable (either it has not been
1249 // used as a symbol, or it is an absolute symbol).
1250 MCSymbol *Sym = getContext().LookupSymbol(Name);
1252 // Diagnose assignment to a label.
1254 // FIXME: Diagnostics. Note the location of the definition as a label.
1255 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
1256 if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable())
1257 ; // Allow redefinitions of undefined symbols only used in directives.
1258 else if (!Sym->isUndefined() && !Sym->isAbsolute())
1259 return Error(EqualLoc, "redefinition of '" + Name + "'");
1260 else if (!Sym->isVariable())
1261 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
1262 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
1263 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
1266 // Don't count these checks as uses.
1267 Sym->setUsed(false);
1269 Sym = getContext().GetOrCreateSymbol(Name);
1271 // FIXME: Handle '.'.
1273 // Do the assignment.
1274 Out.EmitAssignment(Sym, Value);
1279 /// ParseIdentifier:
1282 bool AsmParser::ParseIdentifier(StringRef &Res) {
1283 // The assembler has relaxed rules for accepting identifiers, in particular we
1284 // allow things like '.globl $foo', which would normally be separate
1285 // tokens. At this level, we have already lexed so we cannot (currently)
1286 // handle this as a context dependent token, instead we detect adjacent tokens
1287 // and return the combined identifier.
1288 if (Lexer.is(AsmToken::Dollar)) {
1289 SMLoc DollarLoc = getLexer().getLoc();
1291 // Consume the dollar sign, and check for a following identifier.
1293 if (Lexer.isNot(AsmToken::Identifier))
1296 // We have a '$' followed by an identifier, make sure they are adjacent.
1297 if (DollarLoc.getPointer() + 1 != getTok().getLoc().getPointer())
1300 // Construct the joined identifier and consume the token.
1301 Res = StringRef(DollarLoc.getPointer(),
1302 getTok().getIdentifier().size() + 1);
1307 if (Lexer.isNot(AsmToken::Identifier) &&
1308 Lexer.isNot(AsmToken::String))
1311 Res = getTok().getIdentifier();
1313 Lex(); // Consume the identifier token.
1318 /// ParseDirectiveSet:
1319 /// ::= .set identifier ',' expression
1320 bool AsmParser::ParseDirectiveSet(StringRef IDVal) {
1323 if (ParseIdentifier(Name))
1324 return TokError("expected identifier after '" + Twine(IDVal) + "'");
1326 if (getLexer().isNot(AsmToken::Comma))
1327 return TokError("unexpected token in '" + Twine(IDVal) + "'");
1330 return ParseAssignment(Name);
1333 bool AsmParser::ParseEscapedString(std::string &Data) {
1334 assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
1337 StringRef Str = getTok().getStringContents();
1338 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1339 if (Str[i] != '\\') {
1344 // Recognize escaped characters. Note that this escape semantics currently
1345 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
1348 return TokError("unexpected backslash at end of string");
1350 // Recognize octal sequences.
1351 if ((unsigned) (Str[i] - '0') <= 7) {
1352 // Consume up to three octal characters.
1353 unsigned Value = Str[i] - '0';
1355 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
1357 Value = Value * 8 + (Str[i] - '0');
1359 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
1361 Value = Value * 8 + (Str[i] - '0');
1366 return TokError("invalid octal escape sequence (out of range)");
1368 Data += (unsigned char) Value;
1372 // Otherwise recognize individual escapes.
1375 // Just reject invalid escape sequences for now.
1376 return TokError("invalid escape sequence (unrecognized character)");
1378 case 'b': Data += '\b'; break;
1379 case 'f': Data += '\f'; break;
1380 case 'n': Data += '\n'; break;
1381 case 'r': Data += '\r'; break;
1382 case 't': Data += '\t'; break;
1383 case '"': Data += '"'; break;
1384 case '\\': Data += '\\'; break;
1391 /// ParseDirectiveAscii:
1392 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
1393 bool AsmParser::ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
1394 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1395 CheckForValidSection();
1398 if (getLexer().isNot(AsmToken::String))
1399 return TokError("expected string in '" + Twine(IDVal) + "' directive");
1402 if (ParseEscapedString(Data))
1405 getStreamer().EmitBytes(Data, DEFAULT_ADDRSPACE);
1407 getStreamer().EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE);
1411 if (getLexer().is(AsmToken::EndOfStatement))
1414 if (getLexer().isNot(AsmToken::Comma))
1415 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
1424 /// ParseDirectiveValue
1425 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
1426 bool AsmParser::ParseDirectiveValue(unsigned Size) {
1427 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1428 CheckForValidSection();
1431 const MCExpr *Value;
1432 if (ParseExpression(Value))
1435 // Special case constant expressions to match code generator.
1436 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value))
1437 getStreamer().EmitIntValue(MCE->getValue(), Size, DEFAULT_ADDRSPACE);
1439 getStreamer().EmitValue(Value, Size, DEFAULT_ADDRSPACE);
1441 if (getLexer().is(AsmToken::EndOfStatement))
1444 // FIXME: Improve diagnostic.
1445 if (getLexer().isNot(AsmToken::Comma))
1446 return TokError("unexpected token in directive");
1455 /// ParseDirectiveRealValue
1456 /// ::= (.single | .double) [ expression (, expression)* ]
1457 bool AsmParser::ParseDirectiveRealValue(const fltSemantics &Semantics) {
1458 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1459 CheckForValidSection();
1462 // We don't truly support arithmetic on floating point expressions, so we
1463 // have to manually parse unary prefixes.
1465 if (getLexer().is(AsmToken::Minus)) {
1468 } else if (getLexer().is(AsmToken::Plus))
1471 if (getLexer().isNot(AsmToken::Integer) &&
1472 getLexer().isNot(AsmToken::Real))
1473 return TokError("unexpected token in directive");
1475 // Convert to an APFloat.
1476 APFloat Value(Semantics);
1477 if (Value.convertFromString(getTok().getString(),
1478 APFloat::rmNearestTiesToEven) ==
1479 APFloat::opInvalidOp)
1480 return TokError("invalid floating point literal");
1484 // Consume the numeric token.
1487 // Emit the value as an integer.
1488 APInt AsInt = Value.bitcastToAPInt();
1489 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
1490 AsInt.getBitWidth() / 8, DEFAULT_ADDRSPACE);
1492 if (getLexer().is(AsmToken::EndOfStatement))
1495 if (getLexer().isNot(AsmToken::Comma))
1496 return TokError("unexpected token in directive");
1505 /// ParseDirectiveSpace
1506 /// ::= .space expression [ , expression ]
1507 bool AsmParser::ParseDirectiveSpace() {
1508 CheckForValidSection();
1511 if (ParseAbsoluteExpression(NumBytes))
1514 int64_t FillExpr = 0;
1515 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1516 if (getLexer().isNot(AsmToken::Comma))
1517 return TokError("unexpected token in '.space' directive");
1520 if (ParseAbsoluteExpression(FillExpr))
1523 if (getLexer().isNot(AsmToken::EndOfStatement))
1524 return TokError("unexpected token in '.space' directive");
1530 return TokError("invalid number of bytes in '.space' directive");
1532 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
1533 getStreamer().EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE);
1538 /// ParseDirectiveZero
1539 /// ::= .zero expression
1540 bool AsmParser::ParseDirectiveZero() {
1541 CheckForValidSection();
1544 if (ParseAbsoluteExpression(NumBytes))
1548 if (getLexer().is(AsmToken::Comma)) {
1550 if (ParseAbsoluteExpression(Val))
1554 if (getLexer().isNot(AsmToken::EndOfStatement))
1555 return TokError("unexpected token in '.zero' directive");
1559 getStreamer().EmitFill(NumBytes, Val, DEFAULT_ADDRSPACE);
1564 /// ParseDirectiveFill
1565 /// ::= .fill expression , expression , expression
1566 bool AsmParser::ParseDirectiveFill() {
1567 CheckForValidSection();
1570 if (ParseAbsoluteExpression(NumValues))
1573 if (getLexer().isNot(AsmToken::Comma))
1574 return TokError("unexpected token in '.fill' directive");
1578 if (ParseAbsoluteExpression(FillSize))
1581 if (getLexer().isNot(AsmToken::Comma))
1582 return TokError("unexpected token in '.fill' directive");
1586 if (ParseAbsoluteExpression(FillExpr))
1589 if (getLexer().isNot(AsmToken::EndOfStatement))
1590 return TokError("unexpected token in '.fill' directive");
1594 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
1595 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
1597 for (uint64_t i = 0, e = NumValues; i != e; ++i)
1598 getStreamer().EmitIntValue(FillExpr, FillSize, DEFAULT_ADDRSPACE);
1603 /// ParseDirectiveOrg
1604 /// ::= .org expression [ , expression ]
1605 bool AsmParser::ParseDirectiveOrg() {
1606 CheckForValidSection();
1608 const MCExpr *Offset;
1609 if (ParseExpression(Offset))
1612 // Parse optional fill expression.
1613 int64_t FillExpr = 0;
1614 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1615 if (getLexer().isNot(AsmToken::Comma))
1616 return TokError("unexpected token in '.org' directive");
1619 if (ParseAbsoluteExpression(FillExpr))
1622 if (getLexer().isNot(AsmToken::EndOfStatement))
1623 return TokError("unexpected token in '.org' directive");
1628 // FIXME: Only limited forms of relocatable expressions are accepted here, it
1629 // has to be relative to the current section.
1630 getStreamer().EmitValueToOffset(Offset, FillExpr);
1635 /// ParseDirectiveAlign
1636 /// ::= {.align, ...} expression [ , expression [ , expression ]]
1637 bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
1638 CheckForValidSection();
1640 SMLoc AlignmentLoc = getLexer().getLoc();
1642 if (ParseAbsoluteExpression(Alignment))
1646 bool HasFillExpr = false;
1647 int64_t FillExpr = 0;
1648 int64_t MaxBytesToFill = 0;
1649 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1650 if (getLexer().isNot(AsmToken::Comma))
1651 return TokError("unexpected token in directive");
1654 // The fill expression can be omitted while specifying a maximum number of
1655 // alignment bytes, e.g:
1657 if (getLexer().isNot(AsmToken::Comma)) {
1659 if (ParseAbsoluteExpression(FillExpr))
1663 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1664 if (getLexer().isNot(AsmToken::Comma))
1665 return TokError("unexpected token in directive");
1668 MaxBytesLoc = getLexer().getLoc();
1669 if (ParseAbsoluteExpression(MaxBytesToFill))
1672 if (getLexer().isNot(AsmToken::EndOfStatement))
1673 return TokError("unexpected token in directive");
1682 // Compute alignment in bytes.
1684 // FIXME: Diagnose overflow.
1685 if (Alignment >= 32) {
1686 Error(AlignmentLoc, "invalid alignment value");
1690 Alignment = 1ULL << Alignment;
1693 // Diagnose non-sensical max bytes to align.
1694 if (MaxBytesLoc.isValid()) {
1695 if (MaxBytesToFill < 1) {
1696 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
1697 "many bytes, ignoring maximum bytes expression");
1701 if (MaxBytesToFill >= Alignment) {
1702 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
1708 // Check whether we should use optimal code alignment for this .align
1710 bool UseCodeAlign = getStreamer().getCurrentSection()->UseCodeAlign();
1711 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
1712 ValueSize == 1 && UseCodeAlign) {
1713 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
1715 // FIXME: Target specific behavior about how the "extra" bytes are filled.
1716 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
1723 /// ParseDirectiveSymbolAttribute
1724 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
1725 bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
1726 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1730 if (ParseIdentifier(Name))
1731 return TokError("expected identifier in directive");
1733 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
1735 getStreamer().EmitSymbolAttribute(Sym, Attr);
1737 if (getLexer().is(AsmToken::EndOfStatement))
1740 if (getLexer().isNot(AsmToken::Comma))
1741 return TokError("unexpected token in directive");
1750 /// ParseDirectiveComm
1751 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
1752 bool AsmParser::ParseDirectiveComm(bool IsLocal) {
1753 CheckForValidSection();
1755 SMLoc IDLoc = getLexer().getLoc();
1757 if (ParseIdentifier(Name))
1758 return TokError("expected identifier in directive");
1760 // Handle the identifier as the key symbol.
1761 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
1763 if (getLexer().isNot(AsmToken::Comma))
1764 return TokError("unexpected token in directive");
1768 SMLoc SizeLoc = getLexer().getLoc();
1769 if (ParseAbsoluteExpression(Size))
1772 int64_t Pow2Alignment = 0;
1773 SMLoc Pow2AlignmentLoc;
1774 if (getLexer().is(AsmToken::Comma)) {
1776 Pow2AlignmentLoc = getLexer().getLoc();
1777 if (ParseAbsoluteExpression(Pow2Alignment))
1780 // If this target takes alignments in bytes (not log) validate and convert.
1781 if (Lexer.getMAI().getAlignmentIsInBytes()) {
1782 if (!isPowerOf2_64(Pow2Alignment))
1783 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
1784 Pow2Alignment = Log2_64(Pow2Alignment);
1788 if (getLexer().isNot(AsmToken::EndOfStatement))
1789 return TokError("unexpected token in '.comm' or '.lcomm' directive");
1793 // NOTE: a size of zero for a .comm should create a undefined symbol
1794 // but a size of .lcomm creates a bss symbol of size zero.
1796 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
1797 "be less than zero");
1799 // NOTE: The alignment in the directive is a power of 2 value, the assembler
1800 // may internally end up wanting an alignment in bytes.
1801 // FIXME: Diagnose overflow.
1802 if (Pow2Alignment < 0)
1803 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
1804 "alignment, can't be less than zero");
1806 if (!Sym->isUndefined())
1807 return Error(IDLoc, "invalid symbol redefinition");
1809 // '.lcomm' is equivalent to '.zerofill'.
1810 // Create the Symbol as a common or local common with Size and Pow2Alignment
1812 getStreamer().EmitZerofill(Ctx.getMachOSection(
1813 "__DATA", "__bss", MCSectionMachO::S_ZEROFILL,
1814 0, SectionKind::getBSS()),
1815 Sym, Size, 1 << Pow2Alignment);
1819 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
1823 /// ParseDirectiveAbort
1824 /// ::= .abort [... message ...]
1825 bool AsmParser::ParseDirectiveAbort() {
1826 // FIXME: Use loc from directive.
1827 SMLoc Loc = getLexer().getLoc();
1829 StringRef Str = ParseStringToEndOfStatement();
1830 if (getLexer().isNot(AsmToken::EndOfStatement))
1831 return TokError("unexpected token in '.abort' directive");
1836 Error(Loc, ".abort detected. Assembly stopping.");
1838 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
1839 // FIXME: Actually abort assembly here.
1844 /// ParseDirectiveInclude
1845 /// ::= .include "filename"
1846 bool AsmParser::ParseDirectiveInclude() {
1847 if (getLexer().isNot(AsmToken::String))
1848 return TokError("expected string in '.include' directive");
1850 std::string Filename = getTok().getString();
1851 SMLoc IncludeLoc = getLexer().getLoc();
1854 if (getLexer().isNot(AsmToken::EndOfStatement))
1855 return TokError("unexpected token in '.include' directive");
1857 // Strip the quotes.
1858 Filename = Filename.substr(1, Filename.size()-2);
1860 // Attempt to switch the lexer to the included file before consuming the end
1861 // of statement to avoid losing it when we switch.
1862 if (EnterIncludeFile(Filename)) {
1863 Error(IncludeLoc, "Could not find include file '" + Filename + "'");
1870 /// ParseDirectiveIf
1871 /// ::= .if expression
1872 bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
1873 TheCondStack.push_back(TheCondState);
1874 TheCondState.TheCond = AsmCond::IfCond;
1875 if(TheCondState.Ignore) {
1876 EatToEndOfStatement();
1880 if (ParseAbsoluteExpression(ExprValue))
1883 if (getLexer().isNot(AsmToken::EndOfStatement))
1884 return TokError("unexpected token in '.if' directive");
1888 TheCondState.CondMet = ExprValue;
1889 TheCondState.Ignore = !TheCondState.CondMet;
1895 /// ParseDirectiveElseIf
1896 /// ::= .elseif expression
1897 bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {
1898 if (TheCondState.TheCond != AsmCond::IfCond &&
1899 TheCondState.TheCond != AsmCond::ElseIfCond)
1900 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
1902 TheCondState.TheCond = AsmCond::ElseIfCond;
1904 bool LastIgnoreState = false;
1905 if (!TheCondStack.empty())
1906 LastIgnoreState = TheCondStack.back().Ignore;
1907 if (LastIgnoreState || TheCondState.CondMet) {
1908 TheCondState.Ignore = true;
1909 EatToEndOfStatement();
1913 if (ParseAbsoluteExpression(ExprValue))
1916 if (getLexer().isNot(AsmToken::EndOfStatement))
1917 return TokError("unexpected token in '.elseif' directive");
1920 TheCondState.CondMet = ExprValue;
1921 TheCondState.Ignore = !TheCondState.CondMet;
1927 /// ParseDirectiveElse
1929 bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
1930 if (getLexer().isNot(AsmToken::EndOfStatement))
1931 return TokError("unexpected token in '.else' directive");
1935 if (TheCondState.TheCond != AsmCond::IfCond &&
1936 TheCondState.TheCond != AsmCond::ElseIfCond)
1937 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
1939 TheCondState.TheCond = AsmCond::ElseCond;
1940 bool LastIgnoreState = false;
1941 if (!TheCondStack.empty())
1942 LastIgnoreState = TheCondStack.back().Ignore;
1943 if (LastIgnoreState || TheCondState.CondMet)
1944 TheCondState.Ignore = true;
1946 TheCondState.Ignore = false;
1951 /// ParseDirectiveEndIf
1953 bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
1954 if (getLexer().isNot(AsmToken::EndOfStatement))
1955 return TokError("unexpected token in '.endif' directive");
1959 if ((TheCondState.TheCond == AsmCond::NoCond) ||
1960 TheCondStack.empty())
1961 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
1963 if (!TheCondStack.empty()) {
1964 TheCondState = TheCondStack.back();
1965 TheCondStack.pop_back();
1971 /// ParseDirectiveFile
1972 /// ::= .file [number] string
1973 bool GenericAsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
1974 // FIXME: I'm not sure what this is.
1975 int64_t FileNumber = -1;
1976 SMLoc FileNumberLoc = getLexer().getLoc();
1977 if (getLexer().is(AsmToken::Integer)) {
1978 FileNumber = getTok().getIntVal();
1982 return TokError("file number less than one");
1985 if (getLexer().isNot(AsmToken::String))
1986 return TokError("unexpected token in '.file' directive");
1988 StringRef Filename = getTok().getString();
1989 Filename = Filename.substr(1, Filename.size()-2);
1992 if (getLexer().isNot(AsmToken::EndOfStatement))
1993 return TokError("unexpected token in '.file' directive");
1995 if (FileNumber == -1)
1996 getStreamer().EmitFileDirective(Filename);
1998 if (getContext().GetDwarfFile(Filename, FileNumber) == 0)
1999 Error(FileNumberLoc, "file number already allocated");
2000 getStreamer().EmitDwarfFileDirective(FileNumber, Filename);
2006 /// ParseDirectiveLine
2007 /// ::= .line [number]
2008 bool GenericAsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) {
2009 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2010 if (getLexer().isNot(AsmToken::Integer))
2011 return TokError("unexpected token in '.line' directive");
2013 int64_t LineNumber = getTok().getIntVal();
2017 // FIXME: Do something with the .line.
2020 if (getLexer().isNot(AsmToken::EndOfStatement))
2021 return TokError("unexpected token in '.line' directive");
2027 /// ParseDirectiveLoc
2028 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
2029 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
2030 /// The first number is a file number, must have been previously assigned with
2031 /// a .file directive, the second number is the line number and optionally the
2032 /// third number is a column position (zero if not specified). The remaining
2033 /// optional items are .loc sub-directives.
2034 bool GenericAsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) {
2036 if (getLexer().isNot(AsmToken::Integer))
2037 return TokError("unexpected token in '.loc' directive");
2038 int64_t FileNumber = getTok().getIntVal();
2040 return TokError("file number less than one in '.loc' directive");
2041 if (!getContext().isValidDwarfFileNumber(FileNumber))
2042 return TokError("unassigned file number in '.loc' directive");
2045 int64_t LineNumber = 0;
2046 if (getLexer().is(AsmToken::Integer)) {
2047 LineNumber = getTok().getIntVal();
2049 return TokError("line number less than one in '.loc' directive");
2053 int64_t ColumnPos = 0;
2054 if (getLexer().is(AsmToken::Integer)) {
2055 ColumnPos = getTok().getIntVal();
2057 return TokError("column position less than zero in '.loc' directive");
2061 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
2063 int64_t Discriminator = 0;
2064 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2066 if (getLexer().is(AsmToken::EndOfStatement))
2070 SMLoc Loc = getTok().getLoc();
2071 if (getParser().ParseIdentifier(Name))
2072 return TokError("unexpected token in '.loc' directive");
2074 if (Name == "basic_block")
2075 Flags |= DWARF2_FLAG_BASIC_BLOCK;
2076 else if (Name == "prologue_end")
2077 Flags |= DWARF2_FLAG_PROLOGUE_END;
2078 else if (Name == "epilogue_begin")
2079 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
2080 else if (Name == "is_stmt") {
2081 SMLoc Loc = getTok().getLoc();
2082 const MCExpr *Value;
2083 if (getParser().ParseExpression(Value))
2085 // The expression must be the constant 0 or 1.
2086 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2087 int Value = MCE->getValue();
2089 Flags &= ~DWARF2_FLAG_IS_STMT;
2090 else if (Value == 1)
2091 Flags |= DWARF2_FLAG_IS_STMT;
2093 return Error(Loc, "is_stmt value not 0 or 1");
2096 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
2099 else if (Name == "isa") {
2100 SMLoc Loc = getTok().getLoc();
2101 const MCExpr *Value;
2102 if (getParser().ParseExpression(Value))
2104 // The expression must be a constant greater or equal to 0.
2105 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2106 int Value = MCE->getValue();
2108 return Error(Loc, "isa number less than zero");
2112 return Error(Loc, "isa number not a constant value");
2115 else if (Name == "discriminator") {
2116 if (getParser().ParseAbsoluteExpression(Discriminator))
2120 return Error(Loc, "unknown sub-directive in '.loc' directive");
2123 if (getLexer().is(AsmToken::EndOfStatement))
2128 getContext().setCurrentDwarfLoc(FileNumber, LineNumber, ColumnPos, Flags,
2129 Isa, Discriminator);
2134 /// ParseDirectiveStabs
2135 /// ::= .stabs string, number, number, number
2136 bool GenericAsmParser::ParseDirectiveStabs(StringRef Directive,
2137 SMLoc DirectiveLoc) {
2138 return TokError("unsupported directive '" + Directive + "'");
2141 /// ParseDirectiveCFIStartProc
2142 /// ::= .cfi_startproc
2143 bool GenericAsmParser::ParseDirectiveCFIStartProc(StringRef,
2144 SMLoc DirectiveLoc) {
2148 /// ParseDirectiveCFIEndProc
2149 /// ::= .cfi_endproc
2150 bool GenericAsmParser::ParseDirectiveCFIEndProc(StringRef, SMLoc DirectiveLoc) {
2154 /// ParseDirectiveCFIDefCfaOffset
2155 /// ::= .cfi_def_cfa_offset offset
2156 bool GenericAsmParser::ParseDirectiveCFIDefCfaOffset(StringRef,
2157 SMLoc DirectiveLoc) {
2159 if (getParser().ParseAbsoluteExpression(Offset))
2165 /// ParseDirectiveCFIDefCfaRegister
2166 /// ::= .cfi_def_cfa_register register
2167 bool GenericAsmParser::ParseDirectiveCFIDefCfaRegister(StringRef,
2168 SMLoc DirectiveLoc) {
2169 int64_t Register = 0;
2170 if (getParser().ParseAbsoluteExpression(Register))
2175 /// ParseDirectiveCFIOffset
2176 /// ::= .cfi_off register, offset
2177 bool GenericAsmParser::ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc) {
2178 int64_t Register = 0;
2180 if (getParser().ParseAbsoluteExpression(Register))
2183 if (getLexer().isNot(AsmToken::Comma))
2184 return TokError("unexpected token in directive");
2187 if (getParser().ParseAbsoluteExpression(Offset))
2193 /// ParseDirectiveCFIPersonalityOrLsda
2194 /// ::= .cfi_personality encoding, [symbol_name]
2195 /// ::= .cfi_lsda encoding, [symbol_name]
2196 bool GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda(StringRef,
2197 SMLoc DirectiveLoc) {
2198 int64_t Encoding = 0;
2199 if (getParser().ParseAbsoluteExpression(Encoding))
2201 if (Encoding == 255)
2204 if (getLexer().isNot(AsmToken::Comma))
2205 return TokError("unexpected token in directive");
2209 if (getParser().ParseIdentifier(Name))
2210 return TokError("expected identifier in directive");
2214 /// ParseDirectiveMacrosOnOff
2217 bool GenericAsmParser::ParseDirectiveMacrosOnOff(StringRef Directive,
2218 SMLoc DirectiveLoc) {
2219 if (getLexer().isNot(AsmToken::EndOfStatement))
2220 return Error(getLexer().getLoc(),
2221 "unexpected token in '" + Directive + "' directive");
2223 getParser().MacrosEnabled = Directive == ".macros_on";
2228 /// ParseDirectiveMacro
2230 bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive,
2231 SMLoc DirectiveLoc) {
2233 if (getParser().ParseIdentifier(Name))
2234 return TokError("expected identifier in directive");
2236 if (getLexer().isNot(AsmToken::EndOfStatement))
2237 return TokError("unexpected token in '.macro' directive");
2239 // Eat the end of statement.
2242 AsmToken EndToken, StartToken = getTok();
2244 // Lex the macro definition.
2246 // Check whether we have reached the end of the file.
2247 if (getLexer().is(AsmToken::Eof))
2248 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
2250 // Otherwise, check whether we have reach the .endmacro.
2251 if (getLexer().is(AsmToken::Identifier) &&
2252 (getTok().getIdentifier() == ".endm" ||
2253 getTok().getIdentifier() == ".endmacro")) {
2254 EndToken = getTok();
2256 if (getLexer().isNot(AsmToken::EndOfStatement))
2257 return TokError("unexpected token in '" + EndToken.getIdentifier() +
2262 // Otherwise, scan til the end of the statement.
2263 getParser().EatToEndOfStatement();
2266 if (getParser().MacroMap.lookup(Name)) {
2267 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
2270 const char *BodyStart = StartToken.getLoc().getPointer();
2271 const char *BodyEnd = EndToken.getLoc().getPointer();
2272 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
2273 getParser().MacroMap[Name] = new Macro(Name, Body);
2277 /// ParseDirectiveEndMacro
2280 bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive,
2281 SMLoc DirectiveLoc) {
2282 if (getLexer().isNot(AsmToken::EndOfStatement))
2283 return TokError("unexpected token in '" + Directive + "' directive");
2285 // If we are inside a macro instantiation, terminate the current
2287 if (!getParser().ActiveMacros.empty()) {
2288 getParser().HandleMacroExit();
2292 // Otherwise, this .endmacro is a stray entry in the file; well formed
2293 // .endmacro directives are handled during the macro definition parsing.
2294 return TokError("unexpected '" + Directive + "' in file, "
2295 "no current macro definition");
2298 bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
2299 getParser().CheckForValidSection();
2301 const MCExpr *Value;
2303 if (getParser().ParseExpression(Value))
2306 if (getLexer().isNot(AsmToken::EndOfStatement))
2307 return TokError("unexpected token in directive");
2309 if (DirName[1] == 's')
2310 getStreamer().EmitSLEB128Value(Value);
2312 getStreamer().EmitULEB128Value(Value);
2318 /// \brief Create an MCAsmParser instance.
2319 MCAsmParser *llvm::createMCAsmParser(const Target &T, SourceMgr &SM,
2320 MCContext &C, MCStreamer &Out,
2321 const MCAsmInfo &MAI) {
2322 return new AsmParser(T, SM, C, Out, MAI);