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/STLExtras.h"
17 #include "llvm/ADT/StringMap.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCDwarf.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInstPrinter.h"
24 #include "llvm/MC/MCInstrInfo.h"
25 #include "llvm/MC/MCParser/AsmCond.h"
26 #include "llvm/MC/MCParser/AsmLexer.h"
27 #include "llvm/MC/MCParser/MCAsmParser.h"
28 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
29 #include "llvm/MC/MCRegisterInfo.h"
30 #include "llvm/MC/MCSectionMachO.h"
31 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/MC/MCTargetAsmParser.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/MathExtras.h"
37 #include "llvm/Support/MemoryBuffer.h"
38 #include "llvm/Support/SourceMgr.h"
39 #include "llvm/Support/raw_ostream.h"
47 FatalAssemblerWarnings("fatal-assembler-warnings",
48 cl::desc("Consider warnings as error"));
50 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {}
54 /// \brief Helper types for tracking macro definitions.
55 typedef std::vector<AsmToken> MCAsmMacroArgument;
56 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
57 typedef std::pair<StringRef, MCAsmMacroArgument> MCAsmMacroParameter;
58 typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters;
63 MCAsmMacroParameters Parameters;
66 MCAsmMacro(StringRef N, StringRef B, const MCAsmMacroParameters &P) :
67 Name(N), Body(B), Parameters(P) {}
69 MCAsmMacro(const MCAsmMacro& Other)
70 : Name(Other.Name), Body(Other.Body), Parameters(Other.Parameters) {}
73 /// \brief Helper class for storing information about an active macro
75 struct MacroInstantiation {
76 /// The macro being instantiated.
77 const MCAsmMacro *TheMacro;
79 /// The macro instantiation with substitutions.
80 MemoryBuffer *Instantiation;
82 /// The location of the instantiation.
83 SMLoc InstantiationLoc;
85 /// The buffer where parsing should resume upon instantiation completion.
88 /// The location where parsing should resume upon instantiation completion.
92 MacroInstantiation(const MCAsmMacro *M, SMLoc IL, int EB, SMLoc EL,
96 struct ParseStatementInfo {
97 /// ParsedOperands - The parsed operands from the last parsed statement.
98 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
100 /// Opcode - The opcode from the last parsed instruction.
103 /// Error - Was there an error parsing the inline assembly?
106 SmallVectorImpl<AsmRewrite> *AsmRewrites;
108 ParseStatementInfo() : Opcode(~0U), ParseError(false), AsmRewrites(0) {}
109 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
110 : Opcode(~0), ParseError(false), AsmRewrites(rewrites) {}
112 ~ParseStatementInfo() {
113 // Free any parsed operands.
114 for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i)
115 delete ParsedOperands[i];
116 ParsedOperands.clear();
120 /// \brief The concrete assembly parser instance.
121 class AsmParser : public MCAsmParser {
122 AsmParser(const AsmParser &) LLVM_DELETED_FUNCTION;
123 void operator=(const AsmParser &) LLVM_DELETED_FUNCTION;
128 const MCAsmInfo &MAI;
130 SourceMgr::DiagHandlerTy SavedDiagHandler;
131 void *SavedDiagContext;
132 MCAsmParserExtension *PlatformParser;
134 /// This is the current buffer index we're lexing from as managed by the
135 /// SourceMgr object.
138 AsmCond TheCondState;
139 std::vector<AsmCond> TheCondStack;
141 /// ExtensionDirectiveMap - maps directive names to handler methods in parser
142 /// extensions. Extensions register themselves in this map by calling
143 /// addDirectiveHandler.
144 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
146 /// MacroMap - Map of currently defined macros.
147 StringMap<MCAsmMacro*> MacroMap;
149 /// ActiveMacros - Stack of active macro instantiations.
150 std::vector<MacroInstantiation*> ActiveMacros;
152 /// MacroLikeBodies - List of bodies of anonymous macros.
153 std::deque<MCAsmMacro> MacroLikeBodies;
155 /// Boolean tracking whether macro substitution is enabled.
156 unsigned MacrosEnabledFlag : 1;
158 /// Flag tracking whether any errors have been encountered.
159 unsigned HadError : 1;
161 /// The values from the last parsed cpp hash file line comment if any.
162 StringRef CppHashFilename;
163 int64_t CppHashLineNumber;
166 /// When generating dwarf for assembly source files we need to calculate the
167 /// logical line number based on the last parsed cpp hash file line comment
168 /// and current line. Since this is slow and messes up the SourceMgr's
169 /// cache we save the last info we queried with SrcMgr.FindLineNumber().
170 SMLoc LastQueryIDLoc;
172 unsigned LastQueryLine;
174 /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
175 unsigned AssemblerDialect;
177 /// IsDarwin - is Darwin compatibility enabled?
180 /// ParsingInlineAsm - Are we parsing ms-style inline assembly?
181 bool ParsingInlineAsm;
184 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
185 const MCAsmInfo &MAI);
186 virtual ~AsmParser();
188 virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false);
190 virtual void addDirectiveHandler(StringRef Directive,
191 ExtensionDirectiveHandler Handler) {
192 ExtensionDirectiveMap[Directive] = Handler;
196 /// @name MCAsmParser Interface
199 virtual SourceMgr &getSourceManager() { return SrcMgr; }
200 virtual MCAsmLexer &getLexer() { return Lexer; }
201 virtual MCContext &getContext() { return Ctx; }
202 virtual MCStreamer &getStreamer() { return Out; }
203 virtual unsigned getAssemblerDialect() {
204 if (AssemblerDialect == ~0U)
205 return MAI.getAssemblerDialect();
207 return AssemblerDialect;
209 virtual void setAssemblerDialect(unsigned i) {
210 AssemblerDialect = i;
213 virtual bool Warning(SMLoc L, const Twine &Msg,
214 ArrayRef<SMRange> Ranges = None);
215 virtual bool Error(SMLoc L, const Twine &Msg,
216 ArrayRef<SMRange> Ranges = None);
218 virtual const AsmToken &Lex();
220 void setParsingInlineAsm(bool V) { ParsingInlineAsm = V; }
221 bool isParsingInlineAsm() { return ParsingInlineAsm; }
223 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
224 unsigned &NumOutputs, unsigned &NumInputs,
225 SmallVectorImpl<std::pair<void *,bool> > &OpDecls,
226 SmallVectorImpl<std::string> &Constraints,
227 SmallVectorImpl<std::string> &Clobbers,
228 const MCInstrInfo *MII,
229 const MCInstPrinter *IP,
230 MCAsmParserSemaCallback &SI);
232 bool parseExpression(const MCExpr *&Res);
233 virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc);
234 virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc);
235 virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc);
236 virtual bool parseAbsoluteExpression(int64_t &Res);
238 /// parseIdentifier - Parse an identifier or string (as a quoted identifier)
239 /// and set \p Res to the identifier contents.
240 virtual bool parseIdentifier(StringRef &Res);
241 virtual void eatToEndOfStatement();
243 virtual void checkForValidSection();
248 bool ParseStatement(ParseStatementInfo &Info);
249 void EatToEndOfLine();
250 bool ParseCppHashLineFilenameComment(const SMLoc &L);
252 void CheckForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
253 MCAsmMacroParameters Parameters);
254 bool expandMacro(raw_svector_ostream &OS, StringRef Body,
255 const MCAsmMacroParameters &Parameters,
256 const MCAsmMacroArguments &A,
259 /// \brief Are macros enabled in the parser?
260 bool MacrosEnabled() {return MacrosEnabledFlag;}
262 /// \brief Control a flag in the parser that enables or disables macros.
263 void SetMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}
265 /// \brief Lookup a previously defined macro.
266 /// \param Name Macro name.
267 /// \returns Pointer to macro. NULL if no such macro was defined.
268 const MCAsmMacro* LookupMacro(StringRef Name);
270 /// \brief Define a new macro with the given name and information.
271 void DefineMacro(StringRef Name, const MCAsmMacro& Macro);
273 /// \brief Undefine a macro. If no such macro was defined, it's a no-op.
274 void UndefineMacro(StringRef Name);
276 /// \brief Are we inside a macro instantiation?
277 bool InsideMacroInstantiation() {return !ActiveMacros.empty();}
279 /// \brief Handle entry to macro instantiation.
281 /// \param M The macro.
282 /// \param NameLoc Instantiation location.
283 bool HandleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
285 /// \brief Handle exit from macro instantiation.
286 void HandleMacroExit();
288 /// \brief Extract AsmTokens for a macro argument. If the argument delimiter
289 /// is initially unknown, set it to AsmToken::Eof. It will be set to the
290 /// correct delimiter by the method.
291 bool ParseMacroArgument(MCAsmMacroArgument &MA,
292 AsmToken::TokenKind &ArgumentDelimiter);
294 /// \brief Parse all macro arguments for a given macro.
295 bool ParseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
297 void PrintMacroInstantiations();
298 void PrintMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
299 ArrayRef<SMRange> Ranges = None) const {
300 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
302 static void DiagHandler(const SMDiagnostic &Diag, void *Context);
304 /// EnterIncludeFile - Enter the specified file. This returns true on failure.
305 bool EnterIncludeFile(const std::string &Filename);
306 /// ProcessIncbinFile - Process the specified file for the .incbin directive.
307 /// This returns true on failure.
308 bool ProcessIncbinFile(const std::string &Filename);
310 /// \brief Reset the current lexer position to that given by \p Loc. The
311 /// current token is not set; clients should ensure Lex() is called
314 /// \param InBuffer If not -1, should be the known buffer id that contains the
316 void JumpToLoc(SMLoc Loc, int InBuffer=-1);
318 /// \brief Parse up to the end of statement and a return the contents from the
319 /// current token until the end of the statement; the current token on exit
320 /// will be either the EndOfStatement or EOF.
321 virtual StringRef parseStringToEndOfStatement();
323 /// \brief Parse until the end of a statement or a comma is encountered,
324 /// return the contents from the current token up to the end or comma.
325 StringRef ParseStringToComma();
327 bool ParseAssignment(StringRef Name, bool allow_redef,
328 bool NoDeadStrip = false);
330 bool ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc);
331 bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
332 bool ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
333 bool ParseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);
335 bool ParseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);
337 // Generic (target and platform independent) directive parsing.
339 DK_NO_DIRECTIVE, // Placeholder
340 DK_SET, DK_EQU, DK_EQUIV, DK_ASCII, DK_ASCIZ, DK_STRING, DK_BYTE, DK_SHORT,
341 DK_VALUE, DK_2BYTE, DK_LONG, DK_INT, DK_4BYTE, DK_QUAD, DK_8BYTE, DK_SINGLE,
342 DK_FLOAT, DK_DOUBLE, DK_ALIGN, DK_ALIGN32, DK_BALIGN, DK_BALIGNW,
343 DK_BALIGNL, DK_P2ALIGN, DK_P2ALIGNW, DK_P2ALIGNL, DK_ORG, DK_FILL, DK_ENDR,
344 DK_BUNDLE_ALIGN_MODE, DK_BUNDLE_LOCK, DK_BUNDLE_UNLOCK,
345 DK_ZERO, DK_EXTERN, DK_GLOBL, DK_GLOBAL,
346 DK_LAZY_REFERENCE, DK_NO_DEAD_STRIP, DK_SYMBOL_RESOLVER, DK_PRIVATE_EXTERN,
347 DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE,
348 DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT,
349 DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC,
350 DK_IF, DK_IFB, DK_IFNB, DK_IFC, DK_IFNC, DK_IFDEF, DK_IFNDEF, DK_IFNOTDEF,
351 DK_ELSEIF, DK_ELSE, DK_ENDIF,
352 DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS,
353 DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA,
354 DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER,
355 DK_CFI_OFFSET, DK_CFI_REL_OFFSET, DK_CFI_PERSONALITY, DK_CFI_LSDA,
356 DK_CFI_REMEMBER_STATE, DK_CFI_RESTORE_STATE, DK_CFI_SAME_VALUE,
357 DK_CFI_RESTORE, DK_CFI_ESCAPE, DK_CFI_SIGNAL_FRAME, DK_CFI_UNDEFINED,
359 DK_MACROS_ON, DK_MACROS_OFF, DK_MACRO, DK_ENDM, DK_ENDMACRO, DK_PURGEM,
360 DK_SLEB128, DK_ULEB128
363 /// DirectiveKindMap - Maps directive name --> DirectiveKind enum, for
364 /// directives parsed by this class.
365 StringMap<DirectiveKind> DirectiveKindMap;
367 // ".ascii", ".asciz", ".string"
368 bool ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
369 bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ...
370 bool ParseDirectiveRealValue(const fltSemantics &); // ".single", ...
371 bool ParseDirectiveFill(); // ".fill"
372 bool ParseDirectiveZero(); // ".zero"
373 // ".set", ".equ", ".equiv"
374 bool ParseDirectiveSet(StringRef IDVal, bool allow_redef);
375 bool ParseDirectiveOrg(); // ".org"
376 // ".align{,32}", ".p2align{,w,l}"
377 bool ParseDirectiveAlign(bool IsPow2, unsigned ValueSize);
379 // ".file", ".line", ".loc", ".stabs"
380 bool ParseDirectiveFile(SMLoc DirectiveLoc);
381 bool ParseDirectiveLine();
382 bool ParseDirectiveLoc();
383 bool ParseDirectiveStabs();
386 bool ParseDirectiveCFIRegister(SMLoc DirectiveLoc);
387 bool ParseDirectiveCFISections();
388 bool ParseDirectiveCFIStartProc();
389 bool ParseDirectiveCFIEndProc();
390 bool ParseDirectiveCFIDefCfaOffset();
391 bool ParseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
392 bool ParseDirectiveCFIAdjustCfaOffset();
393 bool ParseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
394 bool ParseDirectiveCFIOffset(SMLoc DirectiveLoc);
395 bool ParseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
396 bool ParseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
397 bool ParseDirectiveCFIRememberState();
398 bool ParseDirectiveCFIRestoreState();
399 bool ParseDirectiveCFISameValue(SMLoc DirectiveLoc);
400 bool ParseDirectiveCFIRestore(SMLoc DirectiveLoc);
401 bool ParseDirectiveCFIEscape();
402 bool ParseDirectiveCFISignalFrame();
403 bool ParseDirectiveCFIUndefined(SMLoc DirectiveLoc);
406 bool ParseDirectivePurgeMacro(SMLoc DirectiveLoc);
407 bool ParseDirectiveEndMacro(StringRef Directive);
408 bool ParseDirectiveMacro(SMLoc DirectiveLoc);
409 bool ParseDirectiveMacrosOnOff(StringRef Directive);
411 // ".bundle_align_mode"
412 bool ParseDirectiveBundleAlignMode();
414 bool ParseDirectiveBundleLock();
416 bool ParseDirectiveBundleUnlock();
419 bool ParseDirectiveSpace(StringRef IDVal);
421 // .sleb128 (Signed=true) and .uleb128 (Signed=false)
422 bool ParseDirectiveLEB128(bool Signed);
424 /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
425 /// accepts a single symbol (which should be a label or an external).
426 bool ParseDirectiveSymbolAttribute(MCSymbolAttr Attr);
428 bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
430 bool ParseDirectiveAbort(); // ".abort"
431 bool ParseDirectiveInclude(); // ".include"
432 bool ParseDirectiveIncbin(); // ".incbin"
434 bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if"
435 // ".ifb" or ".ifnb", depending on ExpectBlank.
436 bool ParseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
437 // ".ifc" or ".ifnc", depending on ExpectEqual.
438 bool ParseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
439 // ".ifdef" or ".ifndef", depending on expect_defined
440 bool ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
441 bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
442 bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else"
443 bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
444 virtual bool parseEscapedString(std::string &Data);
446 const MCExpr *ApplyModifierToExpr(const MCExpr *E,
447 MCSymbolRefExpr::VariantKind Variant);
449 // Macro-like directives
450 MCAsmMacro *ParseMacroLikeBody(SMLoc DirectiveLoc);
451 void InstantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
452 raw_svector_ostream &OS);
453 bool ParseDirectiveRept(SMLoc DirectiveLoc); // ".rept"
454 bool ParseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
455 bool ParseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
456 bool ParseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
458 // "_emit" or "__emit"
459 bool ParseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
463 bool ParseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
465 void initializeDirectiveKindMap();
471 extern MCAsmParserExtension *createDarwinAsmParser();
472 extern MCAsmParserExtension *createELFAsmParser();
473 extern MCAsmParserExtension *createCOFFAsmParser();
477 enum { DEFAULT_ADDRSPACE = 0 };
479 AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx,
480 MCStreamer &_Out, const MCAsmInfo &_MAI)
481 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM),
483 CurBuffer(0), MacrosEnabledFlag(true), CppHashLineNumber(0),
484 AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false) {
485 // Save the old handler.
486 SavedDiagHandler = SrcMgr.getDiagHandler();
487 SavedDiagContext = SrcMgr.getDiagContext();
488 // Set our own handler which calls the saved handler.
489 SrcMgr.setDiagHandler(DiagHandler, this);
490 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
492 // Initialize the platform / file format parser.
494 // FIXME: This is a hack, we need to (majorly) cleanup how these objects are
496 if (_MAI.hasMicrosoftFastStdCallMangling()) {
497 PlatformParser = createCOFFAsmParser();
498 PlatformParser->Initialize(*this);
499 } else if (_MAI.hasSubsectionsViaSymbols()) {
500 PlatformParser = createDarwinAsmParser();
501 PlatformParser->Initialize(*this);
504 PlatformParser = createELFAsmParser();
505 PlatformParser->Initialize(*this);
508 initializeDirectiveKindMap();
511 AsmParser::~AsmParser() {
512 assert(ActiveMacros.empty() && "Unexpected active macro instantiation!");
514 // Destroy any macros.
515 for (StringMap<MCAsmMacro*>::iterator it = MacroMap.begin(),
516 ie = MacroMap.end(); it != ie; ++it)
517 delete it->getValue();
519 delete PlatformParser;
522 void AsmParser::PrintMacroInstantiations() {
523 // Print the active macro instantiation stack.
524 for (std::vector<MacroInstantiation*>::const_reverse_iterator
525 it = ActiveMacros.rbegin(), ie = ActiveMacros.rend(); it != ie; ++it)
526 PrintMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
527 "while in macro instantiation");
530 bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
531 if (FatalAssemblerWarnings)
532 return Error(L, Msg, Ranges);
533 PrintMessage(L, SourceMgr::DK_Warning, Msg, Ranges);
534 PrintMacroInstantiations();
538 bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
540 PrintMessage(L, SourceMgr::DK_Error, Msg, Ranges);
541 PrintMacroInstantiations();
545 bool AsmParser::EnterIncludeFile(const std::string &Filename) {
546 std::string IncludedFile;
547 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
553 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
558 /// Process the specified .incbin file by searching for it in the include paths
559 /// then just emitting the byte contents of the file to the streamer. This
560 /// returns true on failure.
561 bool AsmParser::ProcessIncbinFile(const std::string &Filename) {
562 std::string IncludedFile;
563 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
567 // Pick up the bytes from the file and emit them.
568 getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer());
572 void AsmParser::JumpToLoc(SMLoc Loc, int InBuffer) {
573 if (InBuffer != -1) {
574 CurBuffer = InBuffer;
576 CurBuffer = SrcMgr.FindBufferContainingLoc(Loc);
578 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer());
581 const AsmToken &AsmParser::Lex() {
582 const AsmToken *tok = &Lexer.Lex();
584 if (tok->is(AsmToken::Eof)) {
585 // If this is the end of an included file, pop the parent file off the
587 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
588 if (ParentIncludeLoc != SMLoc()) {
589 JumpToLoc(ParentIncludeLoc);
594 if (tok->is(AsmToken::Error))
595 Error(Lexer.getErrLoc(), Lexer.getErr());
600 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
601 // Create the initial section, if requested.
602 if (!NoInitialTextSection)
609 AsmCond StartingCondState = TheCondState;
611 // If we are generating dwarf for assembly source files save the initial text
612 // section and generate a .file directive.
613 if (getContext().getGenDwarfForAssembly()) {
614 getContext().setGenDwarfSection(getStreamer().getCurrentSection().first);
615 MCSymbol *SectionStartSym = getContext().CreateTempSymbol();
616 getStreamer().EmitLabel(SectionStartSym);
617 getContext().setGenDwarfSectionStartSym(SectionStartSym);
618 getStreamer().EmitDwarfFileDirective(getContext().nextGenDwarfFileNumber(),
620 getContext().getMainFileName());
623 // While we have input, parse each statement.
624 while (Lexer.isNot(AsmToken::Eof)) {
625 ParseStatementInfo Info;
626 if (!ParseStatement(Info)) continue;
628 // We had an error, validate that one was emitted and recover by skipping to
630 assert(HadError && "Parse statement returned an error, but none emitted!");
631 eatToEndOfStatement();
634 if (TheCondState.TheCond != StartingCondState.TheCond ||
635 TheCondState.Ignore != StartingCondState.Ignore)
636 return TokError("unmatched .ifs or .elses");
638 // Check to see there are no empty DwarfFile slots.
639 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles =
640 getContext().getMCDwarfFiles();
641 for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
642 if (!MCDwarfFiles[i])
643 TokError("unassigned file number: " + Twine(i) + " for .file directives");
646 // Check to see that all assembler local symbols were actually defined.
647 // Targets that don't do subsections via symbols may not want this, though,
648 // so conservatively exclude them. Only do this if we're finalizing, though,
649 // as otherwise we won't necessarilly have seen everything yet.
650 if (!NoFinalize && MAI.hasSubsectionsViaSymbols()) {
651 const MCContext::SymbolTable &Symbols = getContext().getSymbols();
652 for (MCContext::SymbolTable::const_iterator i = Symbols.begin(),
655 MCSymbol *Sym = i->getValue();
656 // Variable symbols may not be marked as defined, so check those
657 // explicitly. If we know it's a variable, we have a definition for
658 // the purposes of this check.
659 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
660 // FIXME: We would really like to refer back to where the symbol was
661 // first referenced for a source location. We need to add something
662 // to track that. Currently, we just point to the end of the file.
663 PrintMessage(getLexer().getLoc(), SourceMgr::DK_Error,
664 "assembler local symbol '" + Sym->getName() +
670 // Finalize the output stream if there are no errors and if the client wants
672 if (!HadError && !NoFinalize)
678 void AsmParser::checkForValidSection() {
679 if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) {
680 TokError("expected section directive before assembly directive");
681 Out.InitToTextSection();
685 /// eatToEndOfStatement - Throw away the rest of the line for testing purposes.
686 void AsmParser::eatToEndOfStatement() {
687 while (Lexer.isNot(AsmToken::EndOfStatement) &&
688 Lexer.isNot(AsmToken::Eof))
692 if (Lexer.is(AsmToken::EndOfStatement))
696 StringRef AsmParser::parseStringToEndOfStatement() {
697 const char *Start = getTok().getLoc().getPointer();
699 while (Lexer.isNot(AsmToken::EndOfStatement) &&
700 Lexer.isNot(AsmToken::Eof))
703 const char *End = getTok().getLoc().getPointer();
704 return StringRef(Start, End - Start);
707 StringRef AsmParser::ParseStringToComma() {
708 const char *Start = getTok().getLoc().getPointer();
710 while (Lexer.isNot(AsmToken::EndOfStatement) &&
711 Lexer.isNot(AsmToken::Comma) &&
712 Lexer.isNot(AsmToken::Eof))
715 const char *End = getTok().getLoc().getPointer();
716 return StringRef(Start, End - Start);
719 /// ParseParenExpr - Parse a paren expression and return it.
720 /// NOTE: This assumes the leading '(' has already been consumed.
722 /// parenexpr ::= expr)
724 bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
725 if (parseExpression(Res)) return true;
726 if (Lexer.isNot(AsmToken::RParen))
727 return TokError("expected ')' in parentheses expression");
728 EndLoc = Lexer.getTok().getEndLoc();
733 /// ParseBracketExpr - Parse a bracket expression and return it.
734 /// NOTE: This assumes the leading '[' has already been consumed.
736 /// bracketexpr ::= expr]
738 bool AsmParser::ParseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
739 if (parseExpression(Res)) return true;
740 if (Lexer.isNot(AsmToken::RBrac))
741 return TokError("expected ']' in brackets expression");
742 EndLoc = Lexer.getTok().getEndLoc();
747 /// ParsePrimaryExpr - Parse a primary expression and return it.
748 /// primaryexpr ::= (parenexpr
749 /// primaryexpr ::= symbol
750 /// primaryexpr ::= number
751 /// primaryexpr ::= '.'
752 /// primaryexpr ::= ~,+,- primaryexpr
753 bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
754 SMLoc FirstTokenLoc = getLexer().getLoc();
755 AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
756 switch (FirstTokenKind) {
758 return TokError("unknown token in expression");
759 // If we have an error assume that we've already handled it.
760 case AsmToken::Error:
762 case AsmToken::Exclaim:
763 Lex(); // Eat the operator.
764 if (ParsePrimaryExpr(Res, EndLoc))
766 Res = MCUnaryExpr::CreateLNot(Res, getContext());
768 case AsmToken::Dollar:
769 case AsmToken::String:
770 case AsmToken::Identifier: {
771 StringRef Identifier;
772 if (parseIdentifier(Identifier)) {
773 if (FirstTokenKind == AsmToken::Dollar)
774 return Error(FirstTokenLoc, "invalid token in expression");
778 EndLoc = SMLoc::getFromPointer(Identifier.end());
780 // This is a symbol reference.
781 std::pair<StringRef, StringRef> Split = Identifier.split('@');
782 MCSymbol *Sym = getContext().GetOrCreateSymbol(Split.first);
784 // Lookup the symbol variant if used.
785 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
786 if (Split.first.size() != Identifier.size()) {
787 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
788 if (Variant == MCSymbolRefExpr::VK_Invalid) {
789 Variant = MCSymbolRefExpr::VK_None;
790 return TokError("invalid variant '" + Split.second + "'");
794 // If this is an absolute variable reference, substitute it now to preserve
795 // semantics in the face of reassignment.
796 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
798 return Error(EndLoc, "unexpected modifier on variable reference");
800 Res = Sym->getVariableValue();
804 // Otherwise create a symbol ref.
805 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
808 case AsmToken::Integer: {
809 SMLoc Loc = getTok().getLoc();
810 int64_t IntVal = getTok().getIntVal();
811 Res = MCConstantExpr::Create(IntVal, getContext());
812 EndLoc = Lexer.getTok().getEndLoc();
814 // Look for 'b' or 'f' following an Integer as a directional label
815 if (Lexer.getKind() == AsmToken::Identifier) {
816 StringRef IDVal = getTok().getString();
817 // Lookup the symbol variant if used.
818 std::pair<StringRef, StringRef> Split = IDVal.split('@');
819 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
820 if (Split.first.size() != IDVal.size()) {
821 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
822 if (Variant == MCSymbolRefExpr::VK_Invalid) {
823 Variant = MCSymbolRefExpr::VK_None;
824 return TokError("invalid variant '" + Split.second + "'");
828 if (IDVal == "f" || IDVal == "b"){
829 MCSymbol *Sym = Ctx.GetDirectionalLocalSymbol(IntVal,
830 IDVal == "f" ? 1 : 0);
831 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
832 if (IDVal == "b" && Sym->isUndefined())
833 return Error(Loc, "invalid reference to undefined symbol");
834 EndLoc = Lexer.getTok().getEndLoc();
835 Lex(); // Eat identifier.
840 case AsmToken::Real: {
841 APFloat RealVal(APFloat::IEEEdouble, getTok().getString());
842 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
843 Res = MCConstantExpr::Create(IntVal, getContext());
844 EndLoc = Lexer.getTok().getEndLoc();
848 case AsmToken::Dot: {
849 // This is a '.' reference, which references the current PC. Emit a
850 // temporary label to the streamer and refer to it.
851 MCSymbol *Sym = Ctx.CreateTempSymbol();
853 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
854 EndLoc = Lexer.getTok().getEndLoc();
855 Lex(); // Eat identifier.
858 case AsmToken::LParen:
859 Lex(); // Eat the '('.
860 return ParseParenExpr(Res, EndLoc);
861 case AsmToken::LBrac:
862 if (!PlatformParser->HasBracketExpressions())
863 return TokError("brackets expression not supported on this target");
864 Lex(); // Eat the '['.
865 return ParseBracketExpr(Res, EndLoc);
866 case AsmToken::Minus:
867 Lex(); // Eat the operator.
868 if (ParsePrimaryExpr(Res, EndLoc))
870 Res = MCUnaryExpr::CreateMinus(Res, getContext());
873 Lex(); // Eat the operator.
874 if (ParsePrimaryExpr(Res, EndLoc))
876 Res = MCUnaryExpr::CreatePlus(Res, getContext());
878 case AsmToken::Tilde:
879 Lex(); // Eat the operator.
880 if (ParsePrimaryExpr(Res, EndLoc))
882 Res = MCUnaryExpr::CreateNot(Res, getContext());
887 bool AsmParser::parseExpression(const MCExpr *&Res) {
889 return parseExpression(Res, EndLoc);
892 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
893 return ParsePrimaryExpr(Res, EndLoc);
897 AsmParser::ApplyModifierToExpr(const MCExpr *E,
898 MCSymbolRefExpr::VariantKind Variant) {
899 // Ask the target implementation about this expression first.
900 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
903 // Recurse over the given expression, rebuilding it to apply the given variant
904 // if there is exactly one symbol.
905 switch (E->getKind()) {
907 case MCExpr::Constant:
910 case MCExpr::SymbolRef: {
911 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
913 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
914 TokError("invalid variant on expression '" +
915 getTok().getIdentifier() + "' (already modified)");
919 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext());
922 case MCExpr::Unary: {
923 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
924 const MCExpr *Sub = ApplyModifierToExpr(UE->getSubExpr(), Variant);
927 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext());
930 case MCExpr::Binary: {
931 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
932 const MCExpr *LHS = ApplyModifierToExpr(BE->getLHS(), Variant);
933 const MCExpr *RHS = ApplyModifierToExpr(BE->getRHS(), Variant);
938 if (!LHS) LHS = BE->getLHS();
939 if (!RHS) RHS = BE->getRHS();
941 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext());
945 llvm_unreachable("Invalid expression kind!");
948 /// parseExpression - Parse an expression and return it.
950 /// expr ::= expr &&,|| expr -> lowest.
951 /// expr ::= expr |,^,&,! expr
952 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr
953 /// expr ::= expr <<,>> expr
954 /// expr ::= expr +,- expr
955 /// expr ::= expr *,/,% expr -> highest.
956 /// expr ::= primaryexpr
958 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
959 // Parse the expression.
961 if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
964 // As a special case, we support 'a op b @ modifier' by rewriting the
965 // expression to include the modifier. This is inefficient, but in general we
966 // expect users to use 'a@modifier op b'.
967 if (Lexer.getKind() == AsmToken::At) {
970 if (Lexer.isNot(AsmToken::Identifier))
971 return TokError("unexpected symbol modifier following '@'");
973 MCSymbolRefExpr::VariantKind Variant =
974 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
975 if (Variant == MCSymbolRefExpr::VK_Invalid)
976 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
978 const MCExpr *ModifiedRes = ApplyModifierToExpr(Res, Variant);
980 return TokError("invalid modifier '" + getTok().getIdentifier() +
981 "' (no symbols present)");
988 // Try to constant fold it up front, if possible.
990 if (Res->EvaluateAsAbsolute(Value))
991 Res = MCConstantExpr::Create(Value, getContext());
996 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
998 return ParseParenExpr(Res, EndLoc) ||
999 ParseBinOpRHS(1, Res, EndLoc);
1002 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1005 SMLoc StartLoc = Lexer.getLoc();
1006 if (parseExpression(Expr))
1009 if (!Expr->EvaluateAsAbsolute(Res))
1010 return Error(StartLoc, "expected absolute expression");
1015 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
1016 MCBinaryExpr::Opcode &Kind) {
1019 return 0; // not a binop.
1021 // Lowest Precedence: &&, ||
1022 case AsmToken::AmpAmp:
1023 Kind = MCBinaryExpr::LAnd;
1025 case AsmToken::PipePipe:
1026 Kind = MCBinaryExpr::LOr;
1030 // Low Precedence: |, &, ^
1032 // FIXME: gas seems to support '!' as an infix operator?
1033 case AsmToken::Pipe:
1034 Kind = MCBinaryExpr::Or;
1036 case AsmToken::Caret:
1037 Kind = MCBinaryExpr::Xor;
1040 Kind = MCBinaryExpr::And;
1043 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1044 case AsmToken::EqualEqual:
1045 Kind = MCBinaryExpr::EQ;
1047 case AsmToken::ExclaimEqual:
1048 case AsmToken::LessGreater:
1049 Kind = MCBinaryExpr::NE;
1051 case AsmToken::Less:
1052 Kind = MCBinaryExpr::LT;
1054 case AsmToken::LessEqual:
1055 Kind = MCBinaryExpr::LTE;
1057 case AsmToken::Greater:
1058 Kind = MCBinaryExpr::GT;
1060 case AsmToken::GreaterEqual:
1061 Kind = MCBinaryExpr::GTE;
1064 // Intermediate Precedence: <<, >>
1065 case AsmToken::LessLess:
1066 Kind = MCBinaryExpr::Shl;
1068 case AsmToken::GreaterGreater:
1069 Kind = MCBinaryExpr::Shr;
1072 // High Intermediate Precedence: +, -
1073 case AsmToken::Plus:
1074 Kind = MCBinaryExpr::Add;
1076 case AsmToken::Minus:
1077 Kind = MCBinaryExpr::Sub;
1080 // Highest Precedence: *, /, %
1081 case AsmToken::Star:
1082 Kind = MCBinaryExpr::Mul;
1084 case AsmToken::Slash:
1085 Kind = MCBinaryExpr::Div;
1087 case AsmToken::Percent:
1088 Kind = MCBinaryExpr::Mod;
1094 /// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
1095 /// Res contains the LHS of the expression on input.
1096 bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1099 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1100 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1102 // If the next token is lower precedence than we are allowed to eat, return
1103 // successfully with what we ate already.
1104 if (TokPrec < Precedence)
1109 // Eat the next primary expression.
1111 if (ParsePrimaryExpr(RHS, EndLoc)) return true;
1113 // If BinOp binds less tightly with RHS than the operator after RHS, let
1114 // the pending operator take RHS as its LHS.
1115 MCBinaryExpr::Opcode Dummy;
1116 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1117 if (TokPrec < NextTokPrec) {
1118 if (ParseBinOpRHS(TokPrec+1, RHS, EndLoc)) return true;
1121 // Merge LHS and RHS according to operator.
1122 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
1127 /// ::= EndOfStatement
1128 /// ::= Label* Directive ...Operands... EndOfStatement
1129 /// ::= Label* Identifier OperandList* EndOfStatement
1130 bool AsmParser::ParseStatement(ParseStatementInfo &Info) {
1131 if (Lexer.is(AsmToken::EndOfStatement)) {
1137 // Statements always start with an identifier or are a full line comment.
1138 AsmToken ID = getTok();
1139 SMLoc IDLoc = ID.getLoc();
1141 int64_t LocalLabelVal = -1;
1142 // A full line comment is a '#' as the first token.
1143 if (Lexer.is(AsmToken::Hash))
1144 return ParseCppHashLineFilenameComment(IDLoc);
1146 // Allow an integer followed by a ':' as a directional local label.
1147 if (Lexer.is(AsmToken::Integer)) {
1148 LocalLabelVal = getTok().getIntVal();
1149 if (LocalLabelVal < 0) {
1150 if (!TheCondState.Ignore)
1151 return TokError("unexpected token at start of statement");
1154 IDVal = getTok().getString();
1155 Lex(); // Consume the integer token to be used as an identifier token.
1156 if (Lexer.getKind() != AsmToken::Colon) {
1157 if (!TheCondState.Ignore)
1158 return TokError("unexpected token at start of statement");
1161 } else if (Lexer.is(AsmToken::Dot)) {
1162 // Treat '.' as a valid identifier in this context.
1165 } else if (parseIdentifier(IDVal)) {
1166 if (!TheCondState.Ignore)
1167 return TokError("unexpected token at start of statement");
1171 // Handle conditional assembly here before checking for skipping. We
1172 // have to do this so that .endif isn't skipped in a ".if 0" block for
1174 StringMap<DirectiveKind>::const_iterator DirKindIt =
1175 DirectiveKindMap.find(IDVal);
1176 DirectiveKind DirKind =
1177 (DirKindIt == DirectiveKindMap.end()) ? DK_NO_DIRECTIVE :
1178 DirKindIt->getValue();
1183 return ParseDirectiveIf(IDLoc);
1185 return ParseDirectiveIfb(IDLoc, true);
1187 return ParseDirectiveIfb(IDLoc, false);
1189 return ParseDirectiveIfc(IDLoc, true);
1191 return ParseDirectiveIfc(IDLoc, false);
1193 return ParseDirectiveIfdef(IDLoc, true);
1196 return ParseDirectiveIfdef(IDLoc, false);
1198 return ParseDirectiveElseIf(IDLoc);
1200 return ParseDirectiveElse(IDLoc);
1202 return ParseDirectiveEndIf(IDLoc);
1205 // Ignore the statement if in the middle of inactive conditional
1207 if (TheCondState.Ignore) {
1208 eatToEndOfStatement();
1212 // FIXME: Recurse on local labels?
1214 // See what kind of statement we have.
1215 switch (Lexer.getKind()) {
1216 case AsmToken::Colon: {
1217 checkForValidSection();
1219 // identifier ':' -> Label.
1222 // Diagnose attempt to use '.' as a label.
1224 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1226 // Diagnose attempt to use a variable as a label.
1228 // FIXME: Diagnostics. Note the location of the definition as a label.
1229 // FIXME: This doesn't diagnose assignment to a symbol which has been
1230 // implicitly marked as external.
1232 if (LocalLabelVal == -1)
1233 Sym = getContext().GetOrCreateSymbol(IDVal);
1235 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
1236 if (!Sym->isUndefined() || Sym->isVariable())
1237 return Error(IDLoc, "invalid symbol redefinition");
1240 if (!ParsingInlineAsm)
1243 // If we are generating dwarf for assembly source files then gather the
1244 // info to make a dwarf label entry for this label if needed.
1245 if (getContext().getGenDwarfForAssembly())
1246 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1249 // Consume any end of statement token, if present, to avoid spurious
1250 // AddBlankLine calls().
1251 if (Lexer.is(AsmToken::EndOfStatement)) {
1253 if (Lexer.is(AsmToken::Eof))
1260 case AsmToken::Equal:
1261 // identifier '=' ... -> assignment statement
1264 return ParseAssignment(IDVal, true);
1266 default: // Normal instruction or directive.
1270 // If macros are enabled, check to see if this is a macro instantiation.
1271 if (MacrosEnabled())
1272 if (const MCAsmMacro *M = LookupMacro(IDVal)) {
1273 return HandleMacroEntry(M, IDLoc);
1276 // Otherwise, we have a normal instruction or directive.
1278 // Directives start with "."
1279 if (IDVal[0] == '.' && IDVal != ".") {
1280 // There are several entities interested in parsing directives:
1282 // 1. The target-specific assembly parser. Some directives are target
1283 // specific or may potentially behave differently on certain targets.
1284 // 2. Asm parser extensions. For example, platform-specific parsers
1285 // (like the ELF parser) register themselves as extensions.
1286 // 3. The generic directive parser implemented by this class. These are
1287 // all the directives that behave in a target and platform independent
1288 // manner, or at least have a default behavior that's shared between
1289 // all targets and platforms.
1291 // First query the target-specific parser. It will return 'true' if it
1292 // isn't interested in this directive.
1293 if (!getTargetParser().ParseDirective(ID))
1296 // Next, check the extention directive map to see if any extension has
1297 // registered itself to parse this directive.
1298 std::pair<MCAsmParserExtension*, DirectiveHandler> Handler =
1299 ExtensionDirectiveMap.lookup(IDVal);
1301 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1303 // Finally, if no one else is interested in this directive, it must be
1304 // generic and familiar to this class.
1310 return ParseDirectiveSet(IDVal, true);
1312 return ParseDirectiveSet(IDVal, false);
1314 return ParseDirectiveAscii(IDVal, false);
1317 return ParseDirectiveAscii(IDVal, true);
1319 return ParseDirectiveValue(1);
1323 return ParseDirectiveValue(2);
1327 return ParseDirectiveValue(4);
1330 return ParseDirectiveValue(8);
1333 return ParseDirectiveRealValue(APFloat::IEEEsingle);
1335 return ParseDirectiveRealValue(APFloat::IEEEdouble);
1337 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1338 return ParseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1341 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1342 return ParseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1345 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1347 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1349 return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1351 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1353 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1355 return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1357 return ParseDirectiveOrg();
1359 return ParseDirectiveFill();
1361 return ParseDirectiveZero();
1363 eatToEndOfStatement(); // .extern is the default, ignore it.
1367 return ParseDirectiveSymbolAttribute(MCSA_Global);
1368 case DK_LAZY_REFERENCE:
1369 return ParseDirectiveSymbolAttribute(MCSA_LazyReference);
1370 case DK_NO_DEAD_STRIP:
1371 return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1372 case DK_SYMBOL_RESOLVER:
1373 return ParseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1374 case DK_PRIVATE_EXTERN:
1375 return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1377 return ParseDirectiveSymbolAttribute(MCSA_Reference);
1378 case DK_WEAK_DEFINITION:
1379 return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1380 case DK_WEAK_REFERENCE:
1381 return ParseDirectiveSymbolAttribute(MCSA_WeakReference);
1382 case DK_WEAK_DEF_CAN_BE_HIDDEN:
1383 return ParseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1386 return ParseDirectiveComm(/*IsLocal=*/false);
1388 return ParseDirectiveComm(/*IsLocal=*/true);
1390 return ParseDirectiveAbort();
1392 return ParseDirectiveInclude();
1394 return ParseDirectiveIncbin();
1397 return TokError(Twine(IDVal) + " not supported yet");
1399 return ParseDirectiveRept(IDLoc);
1401 return ParseDirectiveIrp(IDLoc);
1403 return ParseDirectiveIrpc(IDLoc);
1405 return ParseDirectiveEndr(IDLoc);
1406 case DK_BUNDLE_ALIGN_MODE:
1407 return ParseDirectiveBundleAlignMode();
1408 case DK_BUNDLE_LOCK:
1409 return ParseDirectiveBundleLock();
1410 case DK_BUNDLE_UNLOCK:
1411 return ParseDirectiveBundleUnlock();
1413 return ParseDirectiveLEB128(true);
1415 return ParseDirectiveLEB128(false);
1418 return ParseDirectiveSpace(IDVal);
1420 return ParseDirectiveFile(IDLoc);
1422 return ParseDirectiveLine();
1424 return ParseDirectiveLoc();
1426 return ParseDirectiveStabs();
1427 case DK_CFI_SECTIONS:
1428 return ParseDirectiveCFISections();
1429 case DK_CFI_STARTPROC:
1430 return ParseDirectiveCFIStartProc();
1431 case DK_CFI_ENDPROC:
1432 return ParseDirectiveCFIEndProc();
1433 case DK_CFI_DEF_CFA:
1434 return ParseDirectiveCFIDefCfa(IDLoc);
1435 case DK_CFI_DEF_CFA_OFFSET:
1436 return ParseDirectiveCFIDefCfaOffset();
1437 case DK_CFI_ADJUST_CFA_OFFSET:
1438 return ParseDirectiveCFIAdjustCfaOffset();
1439 case DK_CFI_DEF_CFA_REGISTER:
1440 return ParseDirectiveCFIDefCfaRegister(IDLoc);
1442 return ParseDirectiveCFIOffset(IDLoc);
1443 case DK_CFI_REL_OFFSET:
1444 return ParseDirectiveCFIRelOffset(IDLoc);
1445 case DK_CFI_PERSONALITY:
1446 return ParseDirectiveCFIPersonalityOrLsda(true);
1448 return ParseDirectiveCFIPersonalityOrLsda(false);
1449 case DK_CFI_REMEMBER_STATE:
1450 return ParseDirectiveCFIRememberState();
1451 case DK_CFI_RESTORE_STATE:
1452 return ParseDirectiveCFIRestoreState();
1453 case DK_CFI_SAME_VALUE:
1454 return ParseDirectiveCFISameValue(IDLoc);
1455 case DK_CFI_RESTORE:
1456 return ParseDirectiveCFIRestore(IDLoc);
1458 return ParseDirectiveCFIEscape();
1459 case DK_CFI_SIGNAL_FRAME:
1460 return ParseDirectiveCFISignalFrame();
1461 case DK_CFI_UNDEFINED:
1462 return ParseDirectiveCFIUndefined(IDLoc);
1463 case DK_CFI_REGISTER:
1464 return ParseDirectiveCFIRegister(IDLoc);
1467 return ParseDirectiveMacrosOnOff(IDVal);
1469 return ParseDirectiveMacro(IDLoc);
1472 return ParseDirectiveEndMacro(IDVal);
1474 return ParseDirectivePurgeMacro(IDLoc);
1477 return Error(IDLoc, "unknown directive");
1480 // __asm _emit or __asm __emit
1481 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
1482 IDVal == "_EMIT" || IDVal == "__EMIT"))
1483 return ParseDirectiveMSEmit(IDLoc, Info, IDVal.size());
1486 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
1487 return ParseDirectiveMSAlign(IDLoc, Info);
1489 checkForValidSection();
1491 // Canonicalize the opcode to lower case.
1492 std::string OpcodeStr = IDVal.lower();
1493 ParseInstructionInfo IInfo(Info.AsmRewrites);
1494 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr,
1496 Info.ParsedOperands);
1497 Info.ParseError = HadError;
1499 // Dump the parsed representation, if requested.
1500 if (getShowParsedOperands()) {
1501 SmallString<256> Str;
1502 raw_svector_ostream OS(Str);
1503 OS << "parsed instruction: [";
1504 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
1507 Info.ParsedOperands[i]->print(OS);
1511 PrintMessage(IDLoc, SourceMgr::DK_Note, OS.str());
1514 // If we are generating dwarf for assembly source files and the current
1515 // section is the initial text section then generate a .loc directive for
1517 if (!HadError && getContext().getGenDwarfForAssembly() &&
1518 getContext().getGenDwarfSection() ==
1519 getStreamer().getCurrentSection().first) {
1521 unsigned Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
1523 // If we previously parsed a cpp hash file line comment then make sure the
1524 // current Dwarf File is for the CppHashFilename if not then emit the
1525 // Dwarf File table for it and adjust the line number for the .loc.
1526 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles =
1527 getContext().getMCDwarfFiles();
1528 if (CppHashFilename.size() != 0) {
1529 if (MCDwarfFiles[getContext().getGenDwarfFileNumber()]->getName() !=
1531 getStreamer().EmitDwarfFileDirective(
1532 getContext().nextGenDwarfFileNumber(), StringRef(), CppHashFilename);
1534 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's
1535 // cache with the different Loc from the call above we save the last
1536 // info we queried here with SrcMgr.FindLineNumber().
1537 unsigned CppHashLocLineNo;
1538 if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf)
1539 CppHashLocLineNo = LastQueryLine;
1541 CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf);
1542 LastQueryLine = CppHashLocLineNo;
1543 LastQueryIDLoc = CppHashLoc;
1544 LastQueryBuffer = CppHashBuf;
1546 Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo);
1549 getStreamer().EmitDwarfLocDirective(getContext().getGenDwarfFileNumber(),
1550 Line, 0, DWARF2_LINE_DEFAULT_IS_STMT ?
1551 DWARF2_FLAG_IS_STMT : 0, 0, 0,
1555 // If parsing succeeded, match the instruction.
1558 HadError = getTargetParser().MatchAndEmitInstruction(IDLoc, Info.Opcode,
1559 Info.ParsedOperands,
1564 // Don't skip the rest of the line, the instruction parser is responsible for
1569 /// EatToEndOfLine uses the Lexer to eat the characters to the end of the line
1570 /// since they may not be able to be tokenized to get to the end of line token.
1571 void AsmParser::EatToEndOfLine() {
1572 if (!Lexer.is(AsmToken::EndOfStatement))
1573 Lexer.LexUntilEndOfLine();
1578 /// ParseCppHashLineFilenameComment as this:
1579 /// ::= # number "filename"
1580 /// or just as a full line comment if it doesn't have a number and a string.
1581 bool AsmParser::ParseCppHashLineFilenameComment(const SMLoc &L) {
1582 Lex(); // Eat the hash token.
1584 if (getLexer().isNot(AsmToken::Integer)) {
1585 // Consume the line since in cases it is not a well-formed line directive,
1586 // as if were simply a full line comment.
1591 int64_t LineNumber = getTok().getIntVal();
1594 if (getLexer().isNot(AsmToken::String)) {
1599 StringRef Filename = getTok().getString();
1600 // Get rid of the enclosing quotes.
1601 Filename = Filename.substr(1, Filename.size()-2);
1603 // Save the SMLoc, Filename and LineNumber for later use by diagnostics.
1605 CppHashFilename = Filename;
1606 CppHashLineNumber = LineNumber;
1607 CppHashBuf = CurBuffer;
1609 // Ignore any trailing characters, they're just comment.
1614 /// DiagHandler - will use the last parsed cpp hash line filename comment
1615 /// for the Filename and LineNo if any in the diagnostic.
1616 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
1617 const AsmParser *Parser = static_cast<const AsmParser*>(Context);
1618 raw_ostream &OS = errs();
1620 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
1621 const SMLoc &DiagLoc = Diag.getLoc();
1622 int DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1623 int CppHashBuf = Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc);
1625 // Like SourceMgr::PrintMessage() we need to print the include stack if any
1626 // before printing the message.
1627 int DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1628 if (!Parser->SavedDiagHandler && DiagCurBuffer > 0) {
1629 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
1630 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
1633 // If we have not parsed a cpp hash line filename comment or the source
1634 // manager changed or buffer changed (like in a nested include) then just
1635 // print the normal diagnostic using its Filename and LineNo.
1636 if (!Parser->CppHashLineNumber ||
1637 &DiagSrcMgr != &Parser->SrcMgr ||
1638 DiagBuf != CppHashBuf) {
1639 if (Parser->SavedDiagHandler)
1640 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
1646 // Use the CppHashFilename and calculate a line number based on the
1647 // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for
1649 const std::string Filename = Parser->CppHashFilename;
1651 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
1652 int CppHashLocLineNo =
1653 Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf);
1654 int LineNo = Parser->CppHashLineNumber - 1 +
1655 (DiagLocLineNo - CppHashLocLineNo);
1657 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(),
1658 Filename, LineNo, Diag.getColumnNo(),
1659 Diag.getKind(), Diag.getMessage(),
1660 Diag.getLineContents(), Diag.getRanges());
1662 if (Parser->SavedDiagHandler)
1663 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
1665 NewDiag.print(0, OS);
1668 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
1669 // difference being that that function accepts '@' as part of identifiers and
1670 // we can't do that. AsmLexer.cpp should probably be changed to handle
1671 // '@' as a special case when needed.
1672 static bool isIdentifierChar(char c) {
1673 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
1677 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
1678 const MCAsmMacroParameters &Parameters,
1679 const MCAsmMacroArguments &A,
1681 unsigned NParameters = Parameters.size();
1682 if (NParameters != 0 && NParameters != A.size())
1683 return Error(L, "Wrong number of arguments");
1685 // A macro without parameters is handled differently on Darwin:
1686 // gas accepts no arguments and does no substitutions
1687 while (!Body.empty()) {
1688 // Scan for the next substitution.
1689 std::size_t End = Body.size(), Pos = 0;
1690 for (; Pos != End; ++Pos) {
1691 // Check for a substitution or escape.
1693 // This macro has no parameters, look for $0, $1, etc.
1694 if (Body[Pos] != '$' || Pos + 1 == End)
1697 char Next = Body[Pos + 1];
1698 if (Next == '$' || Next == 'n' ||
1699 isdigit(static_cast<unsigned char>(Next)))
1702 // This macro has parameters, look for \foo, \bar, etc.
1703 if (Body[Pos] == '\\' && Pos + 1 != End)
1709 OS << Body.slice(0, Pos);
1711 // Check if we reached the end.
1716 switch (Body[Pos+1]) {
1722 // $n => number of arguments
1727 // $[0-9] => argument
1729 // Missing arguments are ignored.
1730 unsigned Index = Body[Pos+1] - '0';
1731 if (Index >= A.size())
1734 // Otherwise substitute with the token values, with spaces eliminated.
1735 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1736 ie = A[Index].end(); it != ie; ++it)
1737 OS << it->getString();
1743 unsigned I = Pos + 1;
1744 while (isIdentifierChar(Body[I]) && I + 1 != End)
1747 const char *Begin = Body.data() + Pos +1;
1748 StringRef Argument(Begin, I - (Pos +1));
1750 for (; Index < NParameters; ++Index)
1751 if (Parameters[Index].first == Argument)
1754 if (Index == NParameters) {
1755 if (Body[Pos+1] == '(' && Body[Pos+2] == ')')
1758 OS << '\\' << Argument;
1762 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1763 ie = A[Index].end(); it != ie; ++it)
1764 if (it->getKind() == AsmToken::String)
1765 OS << it->getStringContents();
1767 OS << it->getString();
1769 Pos += 1 + Argument.size();
1772 // Update the scan point.
1773 Body = Body.substr(Pos);
1779 MacroInstantiation::MacroInstantiation(const MCAsmMacro *M, SMLoc IL,
1782 : TheMacro(M), Instantiation(I), InstantiationLoc(IL), ExitBuffer(EB),
1787 static bool IsOperator(AsmToken::TokenKind kind)
1793 case AsmToken::Plus:
1794 case AsmToken::Minus:
1795 case AsmToken::Tilde:
1796 case AsmToken::Slash:
1797 case AsmToken::Star:
1799 case AsmToken::Equal:
1800 case AsmToken::EqualEqual:
1801 case AsmToken::Pipe:
1802 case AsmToken::PipePipe:
1803 case AsmToken::Caret:
1805 case AsmToken::AmpAmp:
1806 case AsmToken::Exclaim:
1807 case AsmToken::ExclaimEqual:
1808 case AsmToken::Percent:
1809 case AsmToken::Less:
1810 case AsmToken::LessEqual:
1811 case AsmToken::LessLess:
1812 case AsmToken::LessGreater:
1813 case AsmToken::Greater:
1814 case AsmToken::GreaterEqual:
1815 case AsmToken::GreaterGreater:
1820 bool AsmParser::ParseMacroArgument(MCAsmMacroArgument &MA,
1821 AsmToken::TokenKind &ArgumentDelimiter) {
1822 unsigned ParenLevel = 0;
1823 unsigned AddTokens = 0;
1825 // gas accepts arguments separated by whitespace, except on Darwin
1827 Lexer.setSkipSpace(false);
1830 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) {
1831 Lexer.setSkipSpace(true);
1832 return TokError("unexpected token in macro instantiation");
1835 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) {
1836 // Spaces and commas cannot be mixed to delimit parameters
1837 if (ArgumentDelimiter == AsmToken::Eof)
1838 ArgumentDelimiter = AsmToken::Comma;
1839 else if (ArgumentDelimiter != AsmToken::Comma) {
1840 Lexer.setSkipSpace(true);
1841 return TokError("expected ' ' for macro argument separator");
1846 if (Lexer.is(AsmToken::Space)) {
1847 Lex(); // Eat spaces
1849 // Spaces can delimit parameters, but could also be part an expression.
1850 // If the token after a space is an operator, add the token and the next
1851 // one into this argument
1852 if (ArgumentDelimiter == AsmToken::Space ||
1853 ArgumentDelimiter == AsmToken::Eof) {
1854 if (IsOperator(Lexer.getKind())) {
1855 // Check to see whether the token is used as an operator,
1856 // or part of an identifier
1857 const char *NextChar = getTok().getEndLoc().getPointer();
1858 if (*NextChar == ' ')
1862 if (!AddTokens && ParenLevel == 0) {
1863 if (ArgumentDelimiter == AsmToken::Eof &&
1864 !IsOperator(Lexer.getKind()))
1865 ArgumentDelimiter = AsmToken::Space;
1871 // HandleMacroEntry relies on not advancing the lexer here
1872 // to be able to fill in the remaining default parameter values
1873 if (Lexer.is(AsmToken::EndOfStatement))
1876 // Adjust the current parentheses level.
1877 if (Lexer.is(AsmToken::LParen))
1879 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
1882 // Append the token to the current argument list.
1883 MA.push_back(getTok());
1889 Lexer.setSkipSpace(true);
1890 if (ParenLevel != 0)
1891 return TokError("unbalanced parentheses in macro argument");
1895 // Parse the macro instantiation arguments.
1896 bool AsmParser::ParseMacroArguments(const MCAsmMacro *M,
1897 MCAsmMacroArguments &A) {
1898 const unsigned NParameters = M ? M->Parameters.size() : 0;
1899 // Argument delimiter is initially unknown. It will be set by
1900 // ParseMacroArgument()
1901 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
1903 // Parse two kinds of macro invocations:
1904 // - macros defined without any parameters accept an arbitrary number of them
1905 // - macros defined with parameters accept at most that many of them
1906 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
1908 MCAsmMacroArgument MA;
1910 if (ParseMacroArgument(MA, ArgumentDelimiter))
1913 if (!MA.empty() || !NParameters)
1915 else if (NParameters) {
1916 if (!M->Parameters[Parameter].second.empty())
1917 A.push_back(M->Parameters[Parameter].second);
1920 // At the end of the statement, fill in remaining arguments that have
1921 // default values. If there aren't any, then the next argument is
1922 // required but missing
1923 if (Lexer.is(AsmToken::EndOfStatement)) {
1924 if (NParameters && Parameter < NParameters - 1) {
1925 if (M->Parameters[Parameter + 1].second.empty())
1926 return TokError("macro argument '" +
1927 Twine(M->Parameters[Parameter + 1].first) +
1935 if (Lexer.is(AsmToken::Comma))
1938 return TokError("Too many arguments");
1941 const MCAsmMacro* AsmParser::LookupMacro(StringRef Name) {
1942 StringMap<MCAsmMacro*>::iterator I = MacroMap.find(Name);
1943 return (I == MacroMap.end()) ? NULL : I->getValue();
1946 void AsmParser::DefineMacro(StringRef Name, const MCAsmMacro& Macro) {
1947 MacroMap[Name] = new MCAsmMacro(Macro);
1950 void AsmParser::UndefineMacro(StringRef Name) {
1951 StringMap<MCAsmMacro*>::iterator I = MacroMap.find(Name);
1952 if (I != MacroMap.end()) {
1953 delete I->getValue();
1958 bool AsmParser::HandleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
1959 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
1960 // this, although we should protect against infinite loops.
1961 if (ActiveMacros.size() == 20)
1962 return TokError("macros cannot be nested more than 20 levels deep");
1964 MCAsmMacroArguments A;
1965 if (ParseMacroArguments(M, A))
1968 // Remove any trailing empty arguments. Do this after-the-fact as we have
1969 // to keep empty arguments in the middle of the list or positionality
1970 // gets off. e.g., "foo 1, , 2" vs. "foo 1, 2,"
1971 while (!A.empty() && A.back().empty())
1974 // Macro instantiation is lexical, unfortunately. We construct a new buffer
1975 // to hold the macro body with substitutions.
1976 SmallString<256> Buf;
1977 StringRef Body = M->Body;
1978 raw_svector_ostream OS(Buf);
1980 if (expandMacro(OS, Body, M->Parameters, A, getTok().getLoc()))
1983 // We include the .endmacro in the buffer as our cue to exit the macro
1985 OS << ".endmacro\n";
1987 MemoryBuffer *Instantiation =
1988 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
1990 // Create the macro instantiation object and add to the current macro
1991 // instantiation stack.
1992 MacroInstantiation *MI = new MacroInstantiation(M, NameLoc,
1996 ActiveMacros.push_back(MI);
1998 // Jump to the macro instantiation and prime the lexer.
1999 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
2000 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
2006 void AsmParser::HandleMacroExit() {
2007 // Jump to the EndOfStatement we should return to, and consume it.
2008 JumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2011 // Pop the instantiation entry.
2012 delete ActiveMacros.back();
2013 ActiveMacros.pop_back();
2016 static bool IsUsedIn(const MCSymbol *Sym, const MCExpr *Value) {
2017 switch (Value->getKind()) {
2018 case MCExpr::Binary: {
2019 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr*>(Value);
2020 return IsUsedIn(Sym, BE->getLHS()) || IsUsedIn(Sym, BE->getRHS());
2022 case MCExpr::Target:
2023 case MCExpr::Constant:
2025 case MCExpr::SymbolRef: {
2026 const MCSymbol &S = static_cast<const MCSymbolRefExpr*>(Value)->getSymbol();
2028 return IsUsedIn(Sym, S.getVariableValue());
2032 return IsUsedIn(Sym, static_cast<const MCUnaryExpr*>(Value)->getSubExpr());
2035 llvm_unreachable("Unknown expr kind!");
2038 bool AsmParser::ParseAssignment(StringRef Name, bool allow_redef,
2040 // FIXME: Use better location, we should use proper tokens.
2041 SMLoc EqualLoc = Lexer.getLoc();
2043 const MCExpr *Value;
2044 if (parseExpression(Value))
2047 // Note: we don't count b as used in "a = b". This is to allow
2051 if (Lexer.isNot(AsmToken::EndOfStatement))
2052 return TokError("unexpected token in assignment");
2054 // Error on assignment to '.'.
2056 return Error(EqualLoc, ("assignment to pseudo-symbol '.' is unsupported "
2057 "(use '.space' or '.org').)"));
2060 // Eat the end of statement marker.
2063 // Validate that the LHS is allowed to be a variable (either it has not been
2064 // used as a symbol, or it is an absolute symbol).
2065 MCSymbol *Sym = getContext().LookupSymbol(Name);
2067 // Diagnose assignment to a label.
2069 // FIXME: Diagnostics. Note the location of the definition as a label.
2070 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
2071 if (IsUsedIn(Sym, Value))
2072 return Error(EqualLoc, "Recursive use of '" + Name + "'");
2073 else if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable())
2074 ; // Allow redefinitions of undefined symbols only used in directives.
2075 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
2076 ; // Allow redefinitions of variables that haven't yet been used.
2077 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
2078 return Error(EqualLoc, "redefinition of '" + Name + "'");
2079 else if (!Sym->isVariable())
2080 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
2081 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
2082 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
2085 // Don't count these checks as uses.
2086 Sym->setUsed(false);
2088 Sym = getContext().GetOrCreateSymbol(Name);
2090 // FIXME: Handle '.'.
2092 // Do the assignment.
2093 Out.EmitAssignment(Sym, Value);
2095 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2101 /// parseIdentifier:
2104 bool AsmParser::parseIdentifier(StringRef &Res) {
2105 // The assembler has relaxed rules for accepting identifiers, in particular we
2106 // allow things like '.globl $foo', which would normally be separate
2107 // tokens. At this level, we have already lexed so we cannot (currently)
2108 // handle this as a context dependent token, instead we detect adjacent tokens
2109 // and return the combined identifier.
2110 if (Lexer.is(AsmToken::Dollar)) {
2111 SMLoc DollarLoc = getLexer().getLoc();
2113 // Consume the dollar sign, and check for a following identifier.
2115 if (Lexer.isNot(AsmToken::Identifier))
2118 // We have a '$' followed by an identifier, make sure they are adjacent.
2119 if (DollarLoc.getPointer() + 1 != getTok().getLoc().getPointer())
2122 // Construct the joined identifier and consume the token.
2123 Res = StringRef(DollarLoc.getPointer(),
2124 getTok().getIdentifier().size() + 1);
2129 if (Lexer.isNot(AsmToken::Identifier) &&
2130 Lexer.isNot(AsmToken::String))
2133 Res = getTok().getIdentifier();
2135 Lex(); // Consume the identifier token.
2140 /// ParseDirectiveSet:
2141 /// ::= .equ identifier ',' expression
2142 /// ::= .equiv identifier ',' expression
2143 /// ::= .set identifier ',' expression
2144 bool AsmParser::ParseDirectiveSet(StringRef IDVal, bool allow_redef) {
2147 if (parseIdentifier(Name))
2148 return TokError("expected identifier after '" + Twine(IDVal) + "'");
2150 if (getLexer().isNot(AsmToken::Comma))
2151 return TokError("unexpected token in '" + Twine(IDVal) + "'");
2154 return ParseAssignment(Name, allow_redef, true);
2157 bool AsmParser::parseEscapedString(std::string &Data) {
2158 assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
2161 StringRef Str = getTok().getStringContents();
2162 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2163 if (Str[i] != '\\') {
2168 // Recognize escaped characters. Note that this escape semantics currently
2169 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2172 return TokError("unexpected backslash at end of string");
2174 // Recognize octal sequences.
2175 if ((unsigned) (Str[i] - '0') <= 7) {
2176 // Consume up to three octal characters.
2177 unsigned Value = Str[i] - '0';
2179 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
2181 Value = Value * 8 + (Str[i] - '0');
2183 if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) {
2185 Value = Value * 8 + (Str[i] - '0');
2190 return TokError("invalid octal escape sequence (out of range)");
2192 Data += (unsigned char) Value;
2196 // Otherwise recognize individual escapes.
2199 // Just reject invalid escape sequences for now.
2200 return TokError("invalid escape sequence (unrecognized character)");
2202 case 'b': Data += '\b'; break;
2203 case 'f': Data += '\f'; break;
2204 case 'n': Data += '\n'; break;
2205 case 'r': Data += '\r'; break;
2206 case 't': Data += '\t'; break;
2207 case '"': Data += '"'; break;
2208 case '\\': Data += '\\'; break;
2215 /// ParseDirectiveAscii:
2216 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2217 bool AsmParser::ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2218 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2219 checkForValidSection();
2222 if (getLexer().isNot(AsmToken::String))
2223 return TokError("expected string in '" + Twine(IDVal) + "' directive");
2226 if (parseEscapedString(Data))
2229 getStreamer().EmitBytes(Data);
2231 getStreamer().EmitBytes(StringRef("\0", 1));
2235 if (getLexer().is(AsmToken::EndOfStatement))
2238 if (getLexer().isNot(AsmToken::Comma))
2239 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
2248 /// ParseDirectiveValue
2249 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
2250 bool AsmParser::ParseDirectiveValue(unsigned Size) {
2251 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2252 checkForValidSection();
2255 const MCExpr *Value;
2256 SMLoc ExprLoc = getLexer().getLoc();
2257 if (parseExpression(Value))
2260 // Special case constant expressions to match code generator.
2261 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2262 assert(Size <= 8 && "Invalid size");
2263 uint64_t IntValue = MCE->getValue();
2264 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
2265 return Error(ExprLoc, "literal value out of range for directive");
2266 getStreamer().EmitIntValue(IntValue, Size);
2268 getStreamer().EmitValue(Value, Size);
2270 if (getLexer().is(AsmToken::EndOfStatement))
2273 // FIXME: Improve diagnostic.
2274 if (getLexer().isNot(AsmToken::Comma))
2275 return TokError("unexpected token in directive");
2284 /// ParseDirectiveRealValue
2285 /// ::= (.single | .double) [ expression (, expression)* ]
2286 bool AsmParser::ParseDirectiveRealValue(const fltSemantics &Semantics) {
2287 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2288 checkForValidSection();
2291 // We don't truly support arithmetic on floating point expressions, so we
2292 // have to manually parse unary prefixes.
2294 if (getLexer().is(AsmToken::Minus)) {
2297 } else if (getLexer().is(AsmToken::Plus))
2300 if (getLexer().isNot(AsmToken::Integer) &&
2301 getLexer().isNot(AsmToken::Real) &&
2302 getLexer().isNot(AsmToken::Identifier))
2303 return TokError("unexpected token in directive");
2305 // Convert to an APFloat.
2306 APFloat Value(Semantics);
2307 StringRef IDVal = getTok().getString();
2308 if (getLexer().is(AsmToken::Identifier)) {
2309 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
2310 Value = APFloat::getInf(Semantics);
2311 else if (!IDVal.compare_lower("nan"))
2312 Value = APFloat::getNaN(Semantics, false, ~0);
2314 return TokError("invalid floating point literal");
2315 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
2316 APFloat::opInvalidOp)
2317 return TokError("invalid floating point literal");
2321 // Consume the numeric token.
2324 // Emit the value as an integer.
2325 APInt AsInt = Value.bitcastToAPInt();
2326 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
2327 AsInt.getBitWidth() / 8);
2329 if (getLexer().is(AsmToken::EndOfStatement))
2332 if (getLexer().isNot(AsmToken::Comma))
2333 return TokError("unexpected token in directive");
2342 /// ParseDirectiveZero
2343 /// ::= .zero expression
2344 bool AsmParser::ParseDirectiveZero() {
2345 checkForValidSection();
2348 if (parseAbsoluteExpression(NumBytes))
2352 if (getLexer().is(AsmToken::Comma)) {
2354 if (parseAbsoluteExpression(Val))
2358 if (getLexer().isNot(AsmToken::EndOfStatement))
2359 return TokError("unexpected token in '.zero' directive");
2363 getStreamer().EmitFill(NumBytes, Val);
2368 /// ParseDirectiveFill
2369 /// ::= .fill expression , expression , expression
2370 bool AsmParser::ParseDirectiveFill() {
2371 checkForValidSection();
2374 if (parseAbsoluteExpression(NumValues))
2377 if (getLexer().isNot(AsmToken::Comma))
2378 return TokError("unexpected token in '.fill' directive");
2382 if (parseAbsoluteExpression(FillSize))
2385 if (getLexer().isNot(AsmToken::Comma))
2386 return TokError("unexpected token in '.fill' directive");
2390 if (parseAbsoluteExpression(FillExpr))
2393 if (getLexer().isNot(AsmToken::EndOfStatement))
2394 return TokError("unexpected token in '.fill' directive");
2398 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
2399 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
2401 for (uint64_t i = 0, e = NumValues; i != e; ++i)
2402 getStreamer().EmitIntValue(FillExpr, FillSize);
2407 /// ParseDirectiveOrg
2408 /// ::= .org expression [ , expression ]
2409 bool AsmParser::ParseDirectiveOrg() {
2410 checkForValidSection();
2412 const MCExpr *Offset;
2413 SMLoc Loc = getTok().getLoc();
2414 if (parseExpression(Offset))
2417 // Parse optional fill expression.
2418 int64_t FillExpr = 0;
2419 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2420 if (getLexer().isNot(AsmToken::Comma))
2421 return TokError("unexpected token in '.org' directive");
2424 if (parseAbsoluteExpression(FillExpr))
2427 if (getLexer().isNot(AsmToken::EndOfStatement))
2428 return TokError("unexpected token in '.org' directive");
2433 // Only limited forms of relocatable expressions are accepted here, it
2434 // has to be relative to the current section. The streamer will return
2435 // 'true' if the expression wasn't evaluatable.
2436 if (getStreamer().EmitValueToOffset(Offset, FillExpr))
2437 return Error(Loc, "expected assembly-time absolute expression");
2442 /// ParseDirectiveAlign
2443 /// ::= {.align, ...} expression [ , expression [ , expression ]]
2444 bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
2445 checkForValidSection();
2447 SMLoc AlignmentLoc = getLexer().getLoc();
2449 if (parseAbsoluteExpression(Alignment))
2453 bool HasFillExpr = false;
2454 int64_t FillExpr = 0;
2455 int64_t MaxBytesToFill = 0;
2456 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2457 if (getLexer().isNot(AsmToken::Comma))
2458 return TokError("unexpected token in directive");
2461 // The fill expression can be omitted while specifying a maximum number of
2462 // alignment bytes, e.g:
2464 if (getLexer().isNot(AsmToken::Comma)) {
2466 if (parseAbsoluteExpression(FillExpr))
2470 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2471 if (getLexer().isNot(AsmToken::Comma))
2472 return TokError("unexpected token in directive");
2475 MaxBytesLoc = getLexer().getLoc();
2476 if (parseAbsoluteExpression(MaxBytesToFill))
2479 if (getLexer().isNot(AsmToken::EndOfStatement))
2480 return TokError("unexpected token in directive");
2489 // Compute alignment in bytes.
2491 // FIXME: Diagnose overflow.
2492 if (Alignment >= 32) {
2493 Error(AlignmentLoc, "invalid alignment value");
2497 Alignment = 1ULL << Alignment;
2499 // Reject alignments that aren't a power of two, for gas compatibility.
2500 if (!isPowerOf2_64(Alignment))
2501 Error(AlignmentLoc, "alignment must be a power of 2");
2504 // Diagnose non-sensical max bytes to align.
2505 if (MaxBytesLoc.isValid()) {
2506 if (MaxBytesToFill < 1) {
2507 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
2508 "many bytes, ignoring maximum bytes expression");
2512 if (MaxBytesToFill >= Alignment) {
2513 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
2519 // Check whether we should use optimal code alignment for this .align
2521 bool UseCodeAlign = getStreamer().getCurrentSection().first->UseCodeAlign();
2522 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
2523 ValueSize == 1 && UseCodeAlign) {
2524 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
2526 // FIXME: Target specific behavior about how the "extra" bytes are filled.
2527 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
2534 /// ParseDirectiveFile
2535 /// ::= .file [number] filename
2536 /// ::= .file number directory filename
2537 bool AsmParser::ParseDirectiveFile(SMLoc DirectiveLoc) {
2538 // FIXME: I'm not sure what this is.
2539 int64_t FileNumber = -1;
2540 SMLoc FileNumberLoc = getLexer().getLoc();
2541 if (getLexer().is(AsmToken::Integer)) {
2542 FileNumber = getTok().getIntVal();
2546 return TokError("file number less than one");
2549 if (getLexer().isNot(AsmToken::String))
2550 return TokError("unexpected token in '.file' directive");
2552 // Usually the directory and filename together, otherwise just the directory.
2553 // Allow the strings to have escaped octal character sequence.
2554 std::string Path = getTok().getString();
2555 if (parseEscapedString(Path))
2559 StringRef Directory;
2561 std::string FilenameData;
2562 if (getLexer().is(AsmToken::String)) {
2563 if (FileNumber == -1)
2564 return TokError("explicit path specified, but no file number");
2565 if (parseEscapedString(FilenameData))
2567 Filename = FilenameData;
2574 if (getLexer().isNot(AsmToken::EndOfStatement))
2575 return TokError("unexpected token in '.file' directive");
2577 if (FileNumber == -1)
2578 getStreamer().EmitFileDirective(Filename);
2580 if (getContext().getGenDwarfForAssembly() == true)
2581 Error(DirectiveLoc, "input can't have .file dwarf directives when -g is "
2582 "used to generate dwarf debug info for assembly code");
2584 if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename))
2585 Error(FileNumberLoc, "file number already allocated");
2591 /// ParseDirectiveLine
2592 /// ::= .line [number]
2593 bool AsmParser::ParseDirectiveLine() {
2594 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2595 if (getLexer().isNot(AsmToken::Integer))
2596 return TokError("unexpected token in '.line' directive");
2598 int64_t LineNumber = getTok().getIntVal();
2602 // FIXME: Do something with the .line.
2605 if (getLexer().isNot(AsmToken::EndOfStatement))
2606 return TokError("unexpected token in '.line' directive");
2611 /// ParseDirectiveLoc
2612 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
2613 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
2614 /// The first number is a file number, must have been previously assigned with
2615 /// a .file directive, the second number is the line number and optionally the
2616 /// third number is a column position (zero if not specified). The remaining
2617 /// optional items are .loc sub-directives.
2618 bool AsmParser::ParseDirectiveLoc() {
2619 if (getLexer().isNot(AsmToken::Integer))
2620 return TokError("unexpected token in '.loc' directive");
2621 int64_t FileNumber = getTok().getIntVal();
2623 return TokError("file number less than one in '.loc' directive");
2624 if (!getContext().isValidDwarfFileNumber(FileNumber))
2625 return TokError("unassigned file number in '.loc' directive");
2628 int64_t LineNumber = 0;
2629 if (getLexer().is(AsmToken::Integer)) {
2630 LineNumber = getTok().getIntVal();
2632 return TokError("line number less than one in '.loc' directive");
2636 int64_t ColumnPos = 0;
2637 if (getLexer().is(AsmToken::Integer)) {
2638 ColumnPos = getTok().getIntVal();
2640 return TokError("column position less than zero in '.loc' directive");
2644 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
2646 int64_t Discriminator = 0;
2647 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2649 if (getLexer().is(AsmToken::EndOfStatement))
2653 SMLoc Loc = getTok().getLoc();
2654 if (parseIdentifier(Name))
2655 return TokError("unexpected token in '.loc' directive");
2657 if (Name == "basic_block")
2658 Flags |= DWARF2_FLAG_BASIC_BLOCK;
2659 else if (Name == "prologue_end")
2660 Flags |= DWARF2_FLAG_PROLOGUE_END;
2661 else if (Name == "epilogue_begin")
2662 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
2663 else if (Name == "is_stmt") {
2664 Loc = getTok().getLoc();
2665 const MCExpr *Value;
2666 if (parseExpression(Value))
2668 // The expression must be the constant 0 or 1.
2669 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2670 int Value = MCE->getValue();
2672 Flags &= ~DWARF2_FLAG_IS_STMT;
2673 else if (Value == 1)
2674 Flags |= DWARF2_FLAG_IS_STMT;
2676 return Error(Loc, "is_stmt value not 0 or 1");
2678 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
2680 } else if (Name == "isa") {
2681 Loc = getTok().getLoc();
2682 const MCExpr *Value;
2683 if (parseExpression(Value))
2685 // The expression must be a constant greater or equal to 0.
2686 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2687 int Value = MCE->getValue();
2689 return Error(Loc, "isa number less than zero");
2692 return Error(Loc, "isa number not a constant value");
2694 } else if (Name == "discriminator") {
2695 if (parseAbsoluteExpression(Discriminator))
2698 return Error(Loc, "unknown sub-directive in '.loc' directive");
2701 if (getLexer().is(AsmToken::EndOfStatement))
2706 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
2707 Isa, Discriminator, StringRef());
2712 /// ParseDirectiveStabs
2713 /// ::= .stabs string, number, number, number
2714 bool AsmParser::ParseDirectiveStabs() {
2715 return TokError("unsupported directive '.stabs'");
2718 /// ParseDirectiveCFISections
2719 /// ::= .cfi_sections section [, section]
2720 bool AsmParser::ParseDirectiveCFISections() {
2725 if (parseIdentifier(Name))
2726 return TokError("Expected an identifier");
2728 if (Name == ".eh_frame")
2730 else if (Name == ".debug_frame")
2733 if (getLexer().is(AsmToken::Comma)) {
2736 if (parseIdentifier(Name))
2737 return TokError("Expected an identifier");
2739 if (Name == ".eh_frame")
2741 else if (Name == ".debug_frame")
2745 getStreamer().EmitCFISections(EH, Debug);
2749 /// ParseDirectiveCFIStartProc
2750 /// ::= .cfi_startproc
2751 bool AsmParser::ParseDirectiveCFIStartProc() {
2752 getStreamer().EmitCFIStartProc();
2756 /// ParseDirectiveCFIEndProc
2757 /// ::= .cfi_endproc
2758 bool AsmParser::ParseDirectiveCFIEndProc() {
2759 getStreamer().EmitCFIEndProc();
2763 /// ParseRegisterOrRegisterNumber - parse register name or number.
2764 bool AsmParser::ParseRegisterOrRegisterNumber(int64_t &Register,
2765 SMLoc DirectiveLoc) {
2768 if (getLexer().isNot(AsmToken::Integer)) {
2769 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
2771 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
2773 return parseAbsoluteExpression(Register);
2778 /// ParseDirectiveCFIDefCfa
2779 /// ::= .cfi_def_cfa register, offset
2780 bool AsmParser::ParseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
2781 int64_t Register = 0;
2782 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
2785 if (getLexer().isNot(AsmToken::Comma))
2786 return TokError("unexpected token in directive");
2790 if (parseAbsoluteExpression(Offset))
2793 getStreamer().EmitCFIDefCfa(Register, Offset);
2797 /// ParseDirectiveCFIDefCfaOffset
2798 /// ::= .cfi_def_cfa_offset offset
2799 bool AsmParser::ParseDirectiveCFIDefCfaOffset() {
2801 if (parseAbsoluteExpression(Offset))
2804 getStreamer().EmitCFIDefCfaOffset(Offset);
2808 /// ParseDirectiveCFIRegister
2809 /// ::= .cfi_register register, register
2810 bool AsmParser::ParseDirectiveCFIRegister(SMLoc DirectiveLoc) {
2811 int64_t Register1 = 0;
2812 if (ParseRegisterOrRegisterNumber(Register1, DirectiveLoc))
2815 if (getLexer().isNot(AsmToken::Comma))
2816 return TokError("unexpected token in directive");
2819 int64_t Register2 = 0;
2820 if (ParseRegisterOrRegisterNumber(Register2, DirectiveLoc))
2823 getStreamer().EmitCFIRegister(Register1, Register2);
2827 /// ParseDirectiveCFIAdjustCfaOffset
2828 /// ::= .cfi_adjust_cfa_offset adjustment
2829 bool AsmParser::ParseDirectiveCFIAdjustCfaOffset() {
2830 int64_t Adjustment = 0;
2831 if (parseAbsoluteExpression(Adjustment))
2834 getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
2838 /// ParseDirectiveCFIDefCfaRegister
2839 /// ::= .cfi_def_cfa_register register
2840 bool AsmParser::ParseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
2841 int64_t Register = 0;
2842 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
2845 getStreamer().EmitCFIDefCfaRegister(Register);
2849 /// ParseDirectiveCFIOffset
2850 /// ::= .cfi_offset register, offset
2851 bool AsmParser::ParseDirectiveCFIOffset(SMLoc DirectiveLoc) {
2852 int64_t Register = 0;
2855 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
2858 if (getLexer().isNot(AsmToken::Comma))
2859 return TokError("unexpected token in directive");
2862 if (parseAbsoluteExpression(Offset))
2865 getStreamer().EmitCFIOffset(Register, Offset);
2869 /// ParseDirectiveCFIRelOffset
2870 /// ::= .cfi_rel_offset register, offset
2871 bool AsmParser::ParseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
2872 int64_t Register = 0;
2874 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
2877 if (getLexer().isNot(AsmToken::Comma))
2878 return TokError("unexpected token in directive");
2882 if (parseAbsoluteExpression(Offset))
2885 getStreamer().EmitCFIRelOffset(Register, Offset);
2889 static bool isValidEncoding(int64_t Encoding) {
2890 if (Encoding & ~0xff)
2893 if (Encoding == dwarf::DW_EH_PE_omit)
2896 const unsigned Format = Encoding & 0xf;
2897 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
2898 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
2899 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
2900 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
2903 const unsigned Application = Encoding & 0x70;
2904 if (Application != dwarf::DW_EH_PE_absptr &&
2905 Application != dwarf::DW_EH_PE_pcrel)
2911 /// ParseDirectiveCFIPersonalityOrLsda
2912 /// IsPersonality true for cfi_personality, false for cfi_lsda
2913 /// ::= .cfi_personality encoding, [symbol_name]
2914 /// ::= .cfi_lsda encoding, [symbol_name]
2915 bool AsmParser::ParseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
2916 int64_t Encoding = 0;
2917 if (parseAbsoluteExpression(Encoding))
2919 if (Encoding == dwarf::DW_EH_PE_omit)
2922 if (!isValidEncoding(Encoding))
2923 return TokError("unsupported encoding.");
2925 if (getLexer().isNot(AsmToken::Comma))
2926 return TokError("unexpected token in directive");
2930 if (parseIdentifier(Name))
2931 return TokError("expected identifier in directive");
2933 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
2936 getStreamer().EmitCFIPersonality(Sym, Encoding);
2938 getStreamer().EmitCFILsda(Sym, Encoding);
2942 /// ParseDirectiveCFIRememberState
2943 /// ::= .cfi_remember_state
2944 bool AsmParser::ParseDirectiveCFIRememberState() {
2945 getStreamer().EmitCFIRememberState();
2949 /// ParseDirectiveCFIRestoreState
2950 /// ::= .cfi_remember_state
2951 bool AsmParser::ParseDirectiveCFIRestoreState() {
2952 getStreamer().EmitCFIRestoreState();
2956 /// ParseDirectiveCFISameValue
2957 /// ::= .cfi_same_value register
2958 bool AsmParser::ParseDirectiveCFISameValue(SMLoc DirectiveLoc) {
2959 int64_t Register = 0;
2961 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
2964 getStreamer().EmitCFISameValue(Register);
2968 /// ParseDirectiveCFIRestore
2969 /// ::= .cfi_restore register
2970 bool AsmParser::ParseDirectiveCFIRestore(SMLoc DirectiveLoc) {
2971 int64_t Register = 0;
2972 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
2975 getStreamer().EmitCFIRestore(Register);
2979 /// ParseDirectiveCFIEscape
2980 /// ::= .cfi_escape expression[,...]
2981 bool AsmParser::ParseDirectiveCFIEscape() {
2984 if (parseAbsoluteExpression(CurrValue))
2987 Values.push_back((uint8_t)CurrValue);
2989 while (getLexer().is(AsmToken::Comma)) {
2992 if (parseAbsoluteExpression(CurrValue))
2995 Values.push_back((uint8_t)CurrValue);
2998 getStreamer().EmitCFIEscape(Values);
3002 /// ParseDirectiveCFISignalFrame
3003 /// ::= .cfi_signal_frame
3004 bool AsmParser::ParseDirectiveCFISignalFrame() {
3005 if (getLexer().isNot(AsmToken::EndOfStatement))
3006 return Error(getLexer().getLoc(),
3007 "unexpected token in '.cfi_signal_frame'");
3009 getStreamer().EmitCFISignalFrame();
3013 /// ParseDirectiveCFIUndefined
3014 /// ::= .cfi_undefined register
3015 bool AsmParser::ParseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
3016 int64_t Register = 0;
3018 if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
3021 getStreamer().EmitCFIUndefined(Register);
3025 /// ParseDirectiveMacrosOnOff
3028 bool AsmParser::ParseDirectiveMacrosOnOff(StringRef Directive) {
3029 if (getLexer().isNot(AsmToken::EndOfStatement))
3030 return Error(getLexer().getLoc(),
3031 "unexpected token in '" + Directive + "' directive");
3033 SetMacrosEnabled(Directive == ".macros_on");
3037 /// ParseDirectiveMacro
3038 /// ::= .macro name [parameters]
3039 bool AsmParser::ParseDirectiveMacro(SMLoc DirectiveLoc) {
3041 if (parseIdentifier(Name))
3042 return TokError("expected identifier in '.macro' directive");
3044 MCAsmMacroParameters Parameters;
3045 // Argument delimiter is initially unknown. It will be set by
3046 // ParseMacroArgument()
3047 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
3048 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3050 MCAsmMacroParameter Parameter;
3051 if (parseIdentifier(Parameter.first))
3052 return TokError("expected identifier in '.macro' directive");
3054 if (getLexer().is(AsmToken::Equal)) {
3056 if (ParseMacroArgument(Parameter.second, ArgumentDelimiter))
3060 Parameters.push_back(Parameter);
3062 if (getLexer().is(AsmToken::Comma))
3064 else if (getLexer().is(AsmToken::EndOfStatement))
3069 // Eat the end of statement.
3072 AsmToken EndToken, StartToken = getTok();
3074 // Lex the macro definition.
3076 // Check whether we have reached the end of the file.
3077 if (getLexer().is(AsmToken::Eof))
3078 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
3080 // Otherwise, check whether we have reach the .endmacro.
3081 if (getLexer().is(AsmToken::Identifier) &&
3082 (getTok().getIdentifier() == ".endm" ||
3083 getTok().getIdentifier() == ".endmacro")) {
3084 EndToken = getTok();
3086 if (getLexer().isNot(AsmToken::EndOfStatement))
3087 return TokError("unexpected token in '" + EndToken.getIdentifier() +
3092 // Otherwise, scan til the end of the statement.
3093 eatToEndOfStatement();
3096 if (LookupMacro(Name)) {
3097 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
3100 const char *BodyStart = StartToken.getLoc().getPointer();
3101 const char *BodyEnd = EndToken.getLoc().getPointer();
3102 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3103 CheckForBadMacro(DirectiveLoc, Name, Body, Parameters);
3104 DefineMacro(Name, MCAsmMacro(Name, Body, Parameters));
3108 /// CheckForBadMacro
3110 /// With the support added for named parameters there may be code out there that
3111 /// is transitioning from positional parameters. In versions of gas that did
3112 /// not support named parameters they would be ignored on the macro defintion.
3113 /// But to support both styles of parameters this is not possible so if a macro
3114 /// defintion has named parameters but does not use them and has what appears
3115 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
3116 /// warning that the positional parameter found in body which have no effect.
3117 /// Hoping the developer will either remove the named parameters from the macro
3118 /// definiton so the positional parameters get used if that was what was
3119 /// intended or change the macro to use the named parameters. It is possible
3120 /// this warning will trigger when the none of the named parameters are used
3121 /// and the strings like $1 are infact to simply to be passed trough unchanged.
3122 void AsmParser::CheckForBadMacro(SMLoc DirectiveLoc, StringRef Name,
3124 MCAsmMacroParameters Parameters) {
3125 // If this macro is not defined with named parameters the warning we are
3126 // checking for here doesn't apply.
3127 unsigned NParameters = Parameters.size();
3128 if (NParameters == 0)
3131 bool NamedParametersFound = false;
3132 bool PositionalParametersFound = false;
3134 // Look at the body of the macro for use of both the named parameters and what
3135 // are likely to be positional parameters. This is what expandMacro() is
3136 // doing when it finds the parameters in the body.
3137 while (!Body.empty()) {
3138 // Scan for the next possible parameter.
3139 std::size_t End = Body.size(), Pos = 0;
3140 for (; Pos != End; ++Pos) {
3141 // Check for a substitution or escape.
3142 // This macro is defined with parameters, look for \foo, \bar, etc.
3143 if (Body[Pos] == '\\' && Pos + 1 != End)
3146 // This macro should have parameters, but look for $0, $1, ..., $n too.
3147 if (Body[Pos] != '$' || Pos + 1 == End)
3149 char Next = Body[Pos + 1];
3150 if (Next == '$' || Next == 'n' ||
3151 isdigit(static_cast<unsigned char>(Next)))
3155 // Check if we reached the end.
3159 if (Body[Pos] == '$') {
3160 switch (Body[Pos+1]) {
3165 // $n => number of arguments
3167 PositionalParametersFound = true;
3170 // $[0-9] => argument
3172 PositionalParametersFound = true;
3178 unsigned I = Pos + 1;
3179 while (isIdentifierChar(Body[I]) && I + 1 != End)
3182 const char *Begin = Body.data() + Pos +1;
3183 StringRef Argument(Begin, I - (Pos +1));
3185 for (; Index < NParameters; ++Index)
3186 if (Parameters[Index].first == Argument)
3189 if (Index == NParameters) {
3190 if (Body[Pos+1] == '(' && Body[Pos+2] == ')')
3196 NamedParametersFound = true;
3197 Pos += 1 + Argument.size();
3200 // Update the scan point.
3201 Body = Body.substr(Pos);
3204 if (!NamedParametersFound && PositionalParametersFound)
3205 Warning(DirectiveLoc, "macro defined with named parameters which are not "
3206 "used in macro body, possible positional parameter "
3207 "found in body which will have no effect");
3210 /// ParseDirectiveEndMacro
3213 bool AsmParser::ParseDirectiveEndMacro(StringRef Directive) {
3214 if (getLexer().isNot(AsmToken::EndOfStatement))
3215 return TokError("unexpected token in '" + Directive + "' directive");
3217 // If we are inside a macro instantiation, terminate the current
3219 if (InsideMacroInstantiation()) {
3224 // Otherwise, this .endmacro is a stray entry in the file; well formed
3225 // .endmacro directives are handled during the macro definition parsing.
3226 return TokError("unexpected '" + Directive + "' in file, "
3227 "no current macro definition");
3230 /// ParseDirectivePurgeMacro
3232 bool AsmParser::ParseDirectivePurgeMacro(SMLoc DirectiveLoc) {
3234 if (parseIdentifier(Name))
3235 return TokError("expected identifier in '.purgem' directive");
3237 if (getLexer().isNot(AsmToken::EndOfStatement))
3238 return TokError("unexpected token in '.purgem' directive");
3240 if (!LookupMacro(Name))
3241 return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
3243 UndefineMacro(Name);
3247 /// ParseDirectiveBundleAlignMode
3248 /// ::= {.bundle_align_mode} expression
3249 bool AsmParser::ParseDirectiveBundleAlignMode() {
3250 checkForValidSection();
3252 // Expect a single argument: an expression that evaluates to a constant
3253 // in the inclusive range 0-30.
3254 SMLoc ExprLoc = getLexer().getLoc();
3255 int64_t AlignSizePow2;
3256 if (parseAbsoluteExpression(AlignSizePow2))
3258 else if (getLexer().isNot(AsmToken::EndOfStatement))
3259 return TokError("unexpected token after expression in"
3260 " '.bundle_align_mode' directive");
3261 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30)
3262 return Error(ExprLoc,
3263 "invalid bundle alignment size (expected between 0 and 30)");
3267 // Because of AlignSizePow2's verified range we can safely truncate it to
3269 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
3273 /// ParseDirectiveBundleLock
3274 /// ::= {.bundle_lock} [align_to_end]
3275 bool AsmParser::ParseDirectiveBundleLock() {
3276 checkForValidSection();
3277 bool AlignToEnd = false;
3279 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3281 SMLoc Loc = getTok().getLoc();
3282 const char *kInvalidOptionError =
3283 "invalid option for '.bundle_lock' directive";
3285 if (parseIdentifier(Option))
3286 return Error(Loc, kInvalidOptionError);
3288 if (Option != "align_to_end")
3289 return Error(Loc, kInvalidOptionError);
3290 else if (getLexer().isNot(AsmToken::EndOfStatement))
3292 "unexpected token after '.bundle_lock' directive option");
3298 getStreamer().EmitBundleLock(AlignToEnd);
3302 /// ParseDirectiveBundleLock
3303 /// ::= {.bundle_lock}
3304 bool AsmParser::ParseDirectiveBundleUnlock() {
3305 checkForValidSection();
3307 if (getLexer().isNot(AsmToken::EndOfStatement))
3308 return TokError("unexpected token in '.bundle_unlock' directive");
3311 getStreamer().EmitBundleUnlock();
3315 /// ParseDirectiveSpace
3316 /// ::= (.skip | .space) expression [ , expression ]
3317 bool AsmParser::ParseDirectiveSpace(StringRef IDVal) {
3318 checkForValidSection();
3321 if (parseAbsoluteExpression(NumBytes))
3324 int64_t FillExpr = 0;
3325 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3326 if (getLexer().isNot(AsmToken::Comma))
3327 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3330 if (parseAbsoluteExpression(FillExpr))
3333 if (getLexer().isNot(AsmToken::EndOfStatement))
3334 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3340 return TokError("invalid number of bytes in '" +
3341 Twine(IDVal) + "' directive");
3343 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
3344 getStreamer().EmitFill(NumBytes, FillExpr);
3349 /// ParseDirectiveLEB128
3350 /// ::= (.sleb128 | .uleb128) expression
3351 bool AsmParser::ParseDirectiveLEB128(bool Signed) {
3352 checkForValidSection();
3353 const MCExpr *Value;
3355 if (parseExpression(Value))
3358 if (getLexer().isNot(AsmToken::EndOfStatement))
3359 return TokError("unexpected token in directive");
3362 getStreamer().EmitSLEB128Value(Value);
3364 getStreamer().EmitULEB128Value(Value);
3369 /// ParseDirectiveSymbolAttribute
3370 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
3371 bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
3372 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3375 SMLoc Loc = getTok().getLoc();
3377 if (parseIdentifier(Name))
3378 return Error(Loc, "expected identifier in directive");
3380 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3382 // Assembler local symbols don't make any sense here. Complain loudly.
3383 if (Sym->isTemporary())
3384 return Error(Loc, "non-local symbol required in directive");
3386 if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
3387 return Error(Loc, "unable to emit symbol attribute");
3389 if (getLexer().is(AsmToken::EndOfStatement))
3392 if (getLexer().isNot(AsmToken::Comma))
3393 return TokError("unexpected token in directive");
3402 /// ParseDirectiveComm
3403 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
3404 bool AsmParser::ParseDirectiveComm(bool IsLocal) {
3405 checkForValidSection();
3407 SMLoc IDLoc = getLexer().getLoc();
3409 if (parseIdentifier(Name))
3410 return TokError("expected identifier in directive");
3412 // Handle the identifier as the key symbol.
3413 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3415 if (getLexer().isNot(AsmToken::Comma))
3416 return TokError("unexpected token in directive");
3420 SMLoc SizeLoc = getLexer().getLoc();
3421 if (parseAbsoluteExpression(Size))
3424 int64_t Pow2Alignment = 0;
3425 SMLoc Pow2AlignmentLoc;
3426 if (getLexer().is(AsmToken::Comma)) {
3428 Pow2AlignmentLoc = getLexer().getLoc();
3429 if (parseAbsoluteExpression(Pow2Alignment))
3432 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
3433 if (IsLocal && LCOMM == LCOMM::NoAlignment)
3434 return Error(Pow2AlignmentLoc, "alignment not supported on this target");
3436 // If this target takes alignments in bytes (not log) validate and convert.
3437 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
3438 (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
3439 if (!isPowerOf2_64(Pow2Alignment))
3440 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
3441 Pow2Alignment = Log2_64(Pow2Alignment);
3445 if (getLexer().isNot(AsmToken::EndOfStatement))
3446 return TokError("unexpected token in '.comm' or '.lcomm' directive");
3450 // NOTE: a size of zero for a .comm should create a undefined symbol
3451 // but a size of .lcomm creates a bss symbol of size zero.
3453 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
3454 "be less than zero");
3456 // NOTE: The alignment in the directive is a power of 2 value, the assembler
3457 // may internally end up wanting an alignment in bytes.
3458 // FIXME: Diagnose overflow.
3459 if (Pow2Alignment < 0)
3460 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
3461 "alignment, can't be less than zero");
3463 if (!Sym->isUndefined())
3464 return Error(IDLoc, "invalid symbol redefinition");
3466 // Create the Symbol as a common or local common with Size and Pow2Alignment
3468 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3472 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3476 /// ParseDirectiveAbort
3477 /// ::= .abort [... message ...]
3478 bool AsmParser::ParseDirectiveAbort() {
3479 // FIXME: Use loc from directive.
3480 SMLoc Loc = getLexer().getLoc();
3482 StringRef Str = parseStringToEndOfStatement();
3483 if (getLexer().isNot(AsmToken::EndOfStatement))
3484 return TokError("unexpected token in '.abort' directive");
3489 Error(Loc, ".abort detected. Assembly stopping.");
3491 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
3492 // FIXME: Actually abort assembly here.
3497 /// ParseDirectiveInclude
3498 /// ::= .include "filename"
3499 bool AsmParser::ParseDirectiveInclude() {
3500 if (getLexer().isNot(AsmToken::String))
3501 return TokError("expected string in '.include' directive");
3503 // Allow the strings to have escaped octal character sequence.
3504 std::string Filename;
3505 if (parseEscapedString(Filename))
3507 SMLoc IncludeLoc = getLexer().getLoc();
3510 if (getLexer().isNot(AsmToken::EndOfStatement))
3511 return TokError("unexpected token in '.include' directive");
3513 // Attempt to switch the lexer to the included file before consuming the end
3514 // of statement to avoid losing it when we switch.
3515 if (EnterIncludeFile(Filename)) {
3516 Error(IncludeLoc, "Could not find include file '" + Filename + "'");
3523 /// ParseDirectiveIncbin
3524 /// ::= .incbin "filename"
3525 bool AsmParser::ParseDirectiveIncbin() {
3526 if (getLexer().isNot(AsmToken::String))
3527 return TokError("expected string in '.incbin' directive");
3529 // Allow the strings to have escaped octal character sequence.
3530 std::string Filename;
3531 if (parseEscapedString(Filename))
3533 SMLoc IncbinLoc = getLexer().getLoc();
3536 if (getLexer().isNot(AsmToken::EndOfStatement))
3537 return TokError("unexpected token in '.incbin' directive");
3539 // Attempt to process the included file.
3540 if (ProcessIncbinFile(Filename)) {
3541 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
3548 /// ParseDirectiveIf
3549 /// ::= .if expression
3550 bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
3551 TheCondStack.push_back(TheCondState);
3552 TheCondState.TheCond = AsmCond::IfCond;
3553 if (TheCondState.Ignore) {
3554 eatToEndOfStatement();
3557 if (parseAbsoluteExpression(ExprValue))
3560 if (getLexer().isNot(AsmToken::EndOfStatement))
3561 return TokError("unexpected token in '.if' directive");
3565 TheCondState.CondMet = ExprValue;
3566 TheCondState.Ignore = !TheCondState.CondMet;
3572 /// ParseDirectiveIfb
3574 bool AsmParser::ParseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
3575 TheCondStack.push_back(TheCondState);
3576 TheCondState.TheCond = AsmCond::IfCond;
3578 if (TheCondState.Ignore) {
3579 eatToEndOfStatement();
3581 StringRef Str = parseStringToEndOfStatement();
3583 if (getLexer().isNot(AsmToken::EndOfStatement))
3584 return TokError("unexpected token in '.ifb' directive");
3588 TheCondState.CondMet = ExpectBlank == Str.empty();
3589 TheCondState.Ignore = !TheCondState.CondMet;
3595 /// ParseDirectiveIfc
3596 /// ::= .ifc string1, string2
3597 bool AsmParser::ParseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
3598 TheCondStack.push_back(TheCondState);
3599 TheCondState.TheCond = AsmCond::IfCond;
3601 if (TheCondState.Ignore) {
3602 eatToEndOfStatement();
3604 StringRef Str1 = ParseStringToComma();
3606 if (getLexer().isNot(AsmToken::Comma))
3607 return TokError("unexpected token in '.ifc' directive");
3611 StringRef Str2 = parseStringToEndOfStatement();
3613 if (getLexer().isNot(AsmToken::EndOfStatement))
3614 return TokError("unexpected token in '.ifc' directive");
3618 TheCondState.CondMet = ExpectEqual == (Str1 == Str2);
3619 TheCondState.Ignore = !TheCondState.CondMet;
3625 /// ParseDirectiveIfdef
3626 /// ::= .ifdef symbol
3627 bool AsmParser::ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
3629 TheCondStack.push_back(TheCondState);
3630 TheCondState.TheCond = AsmCond::IfCond;
3632 if (TheCondState.Ignore) {
3633 eatToEndOfStatement();
3635 if (parseIdentifier(Name))
3636 return TokError("expected identifier after '.ifdef'");
3640 MCSymbol *Sym = getContext().LookupSymbol(Name);
3643 TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined());
3645 TheCondState.CondMet = (Sym == NULL || Sym->isUndefined());
3646 TheCondState.Ignore = !TheCondState.CondMet;
3652 /// ParseDirectiveElseIf
3653 /// ::= .elseif expression
3654 bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {
3655 if (TheCondState.TheCond != AsmCond::IfCond &&
3656 TheCondState.TheCond != AsmCond::ElseIfCond)
3657 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
3659 TheCondState.TheCond = AsmCond::ElseIfCond;
3661 bool LastIgnoreState = false;
3662 if (!TheCondStack.empty())
3663 LastIgnoreState = TheCondStack.back().Ignore;
3664 if (LastIgnoreState || TheCondState.CondMet) {
3665 TheCondState.Ignore = true;
3666 eatToEndOfStatement();
3669 if (parseAbsoluteExpression(ExprValue))
3672 if (getLexer().isNot(AsmToken::EndOfStatement))
3673 return TokError("unexpected token in '.elseif' directive");
3676 TheCondState.CondMet = ExprValue;
3677 TheCondState.Ignore = !TheCondState.CondMet;
3683 /// ParseDirectiveElse
3685 bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) {
3686 if (getLexer().isNot(AsmToken::EndOfStatement))
3687 return TokError("unexpected token in '.else' directive");
3691 if (TheCondState.TheCond != AsmCond::IfCond &&
3692 TheCondState.TheCond != AsmCond::ElseIfCond)
3693 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
3695 TheCondState.TheCond = AsmCond::ElseCond;
3696 bool LastIgnoreState = false;
3697 if (!TheCondStack.empty())
3698 LastIgnoreState = TheCondStack.back().Ignore;
3699 if (LastIgnoreState || TheCondState.CondMet)
3700 TheCondState.Ignore = true;
3702 TheCondState.Ignore = false;
3707 /// ParseDirectiveEndIf
3709 bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
3710 if (getLexer().isNot(AsmToken::EndOfStatement))
3711 return TokError("unexpected token in '.endif' directive");
3715 if ((TheCondState.TheCond == AsmCond::NoCond) ||
3716 TheCondStack.empty())
3717 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
3719 if (!TheCondStack.empty()) {
3720 TheCondState = TheCondStack.back();
3721 TheCondStack.pop_back();
3727 void AsmParser::initializeDirectiveKindMap() {
3728 DirectiveKindMap[".set"] = DK_SET;
3729 DirectiveKindMap[".equ"] = DK_EQU;
3730 DirectiveKindMap[".equiv"] = DK_EQUIV;
3731 DirectiveKindMap[".ascii"] = DK_ASCII;
3732 DirectiveKindMap[".asciz"] = DK_ASCIZ;
3733 DirectiveKindMap[".string"] = DK_STRING;
3734 DirectiveKindMap[".byte"] = DK_BYTE;
3735 DirectiveKindMap[".short"] = DK_SHORT;
3736 DirectiveKindMap[".value"] = DK_VALUE;
3737 DirectiveKindMap[".2byte"] = DK_2BYTE;
3738 DirectiveKindMap[".long"] = DK_LONG;
3739 DirectiveKindMap[".int"] = DK_INT;
3740 DirectiveKindMap[".4byte"] = DK_4BYTE;
3741 DirectiveKindMap[".quad"] = DK_QUAD;
3742 DirectiveKindMap[".8byte"] = DK_8BYTE;
3743 DirectiveKindMap[".single"] = DK_SINGLE;
3744 DirectiveKindMap[".float"] = DK_FLOAT;
3745 DirectiveKindMap[".double"] = DK_DOUBLE;
3746 DirectiveKindMap[".align"] = DK_ALIGN;
3747 DirectiveKindMap[".align32"] = DK_ALIGN32;
3748 DirectiveKindMap[".balign"] = DK_BALIGN;
3749 DirectiveKindMap[".balignw"] = DK_BALIGNW;
3750 DirectiveKindMap[".balignl"] = DK_BALIGNL;
3751 DirectiveKindMap[".p2align"] = DK_P2ALIGN;
3752 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
3753 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
3754 DirectiveKindMap[".org"] = DK_ORG;
3755 DirectiveKindMap[".fill"] = DK_FILL;
3756 DirectiveKindMap[".zero"] = DK_ZERO;
3757 DirectiveKindMap[".extern"] = DK_EXTERN;
3758 DirectiveKindMap[".globl"] = DK_GLOBL;
3759 DirectiveKindMap[".global"] = DK_GLOBAL;
3760 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
3761 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
3762 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
3763 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
3764 DirectiveKindMap[".reference"] = DK_REFERENCE;
3765 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
3766 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
3767 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
3768 DirectiveKindMap[".comm"] = DK_COMM;
3769 DirectiveKindMap[".common"] = DK_COMMON;
3770 DirectiveKindMap[".lcomm"] = DK_LCOMM;
3771 DirectiveKindMap[".abort"] = DK_ABORT;
3772 DirectiveKindMap[".include"] = DK_INCLUDE;
3773 DirectiveKindMap[".incbin"] = DK_INCBIN;
3774 DirectiveKindMap[".code16"] = DK_CODE16;
3775 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
3776 DirectiveKindMap[".rept"] = DK_REPT;
3777 DirectiveKindMap[".irp"] = DK_IRP;
3778 DirectiveKindMap[".irpc"] = DK_IRPC;
3779 DirectiveKindMap[".endr"] = DK_ENDR;
3780 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
3781 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
3782 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
3783 DirectiveKindMap[".if"] = DK_IF;
3784 DirectiveKindMap[".ifb"] = DK_IFB;
3785 DirectiveKindMap[".ifnb"] = DK_IFNB;
3786 DirectiveKindMap[".ifc"] = DK_IFC;
3787 DirectiveKindMap[".ifnc"] = DK_IFNC;
3788 DirectiveKindMap[".ifdef"] = DK_IFDEF;
3789 DirectiveKindMap[".ifndef"] = DK_IFNDEF;
3790 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
3791 DirectiveKindMap[".elseif"] = DK_ELSEIF;
3792 DirectiveKindMap[".else"] = DK_ELSE;
3793 DirectiveKindMap[".endif"] = DK_ENDIF;
3794 DirectiveKindMap[".skip"] = DK_SKIP;
3795 DirectiveKindMap[".space"] = DK_SPACE;
3796 DirectiveKindMap[".file"] = DK_FILE;
3797 DirectiveKindMap[".line"] = DK_LINE;
3798 DirectiveKindMap[".loc"] = DK_LOC;
3799 DirectiveKindMap[".stabs"] = DK_STABS;
3800 DirectiveKindMap[".sleb128"] = DK_SLEB128;
3801 DirectiveKindMap[".uleb128"] = DK_ULEB128;
3802 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
3803 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
3804 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
3805 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
3806 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
3807 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
3808 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
3809 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
3810 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
3811 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
3812 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
3813 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
3814 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
3815 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
3816 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
3817 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
3818 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
3819 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
3820 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
3821 DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
3822 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
3823 DirectiveKindMap[".macro"] = DK_MACRO;
3824 DirectiveKindMap[".endm"] = DK_ENDM;
3825 DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
3826 DirectiveKindMap[".purgem"] = DK_PURGEM;
3830 MCAsmMacro *AsmParser::ParseMacroLikeBody(SMLoc DirectiveLoc) {
3831 AsmToken EndToken, StartToken = getTok();
3833 unsigned NestLevel = 0;
3835 // Check whether we have reached the end of the file.
3836 if (getLexer().is(AsmToken::Eof)) {
3837 Error(DirectiveLoc, "no matching '.endr' in definition");
3841 if (Lexer.is(AsmToken::Identifier) &&
3842 (getTok().getIdentifier() == ".rept")) {
3846 // Otherwise, check whether we have reached the .endr.
3847 if (Lexer.is(AsmToken::Identifier) &&
3848 getTok().getIdentifier() == ".endr") {
3849 if (NestLevel == 0) {
3850 EndToken = getTok();
3852 if (Lexer.isNot(AsmToken::EndOfStatement)) {
3853 TokError("unexpected token in '.endr' directive");
3861 // Otherwise, scan till the end of the statement.
3862 eatToEndOfStatement();
3865 const char *BodyStart = StartToken.getLoc().getPointer();
3866 const char *BodyEnd = EndToken.getLoc().getPointer();
3867 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3869 // We Are Anonymous.
3871 MCAsmMacroParameters Parameters;
3872 MacroLikeBodies.push_back(MCAsmMacro(Name, Body, Parameters));
3873 return &MacroLikeBodies.back();
3876 void AsmParser::InstantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
3877 raw_svector_ostream &OS) {
3880 MemoryBuffer *Instantiation =
3881 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
3883 // Create the macro instantiation object and add to the current macro
3884 // instantiation stack.
3885 MacroInstantiation *MI = new MacroInstantiation(M, DirectiveLoc,
3889 ActiveMacros.push_back(MI);
3891 // Jump to the macro instantiation and prime the lexer.
3892 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
3893 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
3897 bool AsmParser::ParseDirectiveRept(SMLoc DirectiveLoc) {
3899 if (parseAbsoluteExpression(Count))
3900 return TokError("unexpected token in '.rept' directive");
3903 return TokError("Count is negative");
3905 if (Lexer.isNot(AsmToken::EndOfStatement))
3906 return TokError("unexpected token in '.rept' directive");
3908 // Eat the end of statement.
3911 // Lex the rept definition.
3912 MCAsmMacro *M = ParseMacroLikeBody(DirectiveLoc);
3916 // Macro instantiation is lexical, unfortunately. We construct a new buffer
3917 // to hold the macro body with substitutions.
3918 SmallString<256> Buf;
3919 MCAsmMacroParameters Parameters;
3920 MCAsmMacroArguments A;
3921 raw_svector_ostream OS(Buf);
3923 if (expandMacro(OS, M->Body, Parameters, A, getTok().getLoc()))
3926 InstantiateMacroLikeBody(M, DirectiveLoc, OS);
3931 /// ParseDirectiveIrp
3932 /// ::= .irp symbol,values
3933 bool AsmParser::ParseDirectiveIrp(SMLoc DirectiveLoc) {
3934 MCAsmMacroParameters Parameters;
3935 MCAsmMacroParameter Parameter;
3937 if (parseIdentifier(Parameter.first))
3938 return TokError("expected identifier in '.irp' directive");
3940 Parameters.push_back(Parameter);
3942 if (Lexer.isNot(AsmToken::Comma))
3943 return TokError("expected comma in '.irp' directive");
3947 MCAsmMacroArguments A;
3948 if (ParseMacroArguments(0, A))
3951 // Eat the end of statement.
3954 // Lex the irp definition.
3955 MCAsmMacro *M = ParseMacroLikeBody(DirectiveLoc);
3959 // Macro instantiation is lexical, unfortunately. We construct a new buffer
3960 // to hold the macro body with substitutions.
3961 SmallString<256> Buf;
3962 raw_svector_ostream OS(Buf);
3964 for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
3965 MCAsmMacroArguments Args;
3968 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
3972 InstantiateMacroLikeBody(M, DirectiveLoc, OS);
3977 /// ParseDirectiveIrpc
3978 /// ::= .irpc symbol,values
3979 bool AsmParser::ParseDirectiveIrpc(SMLoc DirectiveLoc) {
3980 MCAsmMacroParameters Parameters;
3981 MCAsmMacroParameter Parameter;
3983 if (parseIdentifier(Parameter.first))
3984 return TokError("expected identifier in '.irpc' directive");
3986 Parameters.push_back(Parameter);
3988 if (Lexer.isNot(AsmToken::Comma))
3989 return TokError("expected comma in '.irpc' directive");
3993 MCAsmMacroArguments A;
3994 if (ParseMacroArguments(0, A))
3997 if (A.size() != 1 || A.front().size() != 1)
3998 return TokError("unexpected token in '.irpc' directive");
4000 // Eat the end of statement.
4003 // Lex the irpc definition.
4004 MCAsmMacro *M = ParseMacroLikeBody(DirectiveLoc);
4008 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4009 // to hold the macro body with substitutions.
4010 SmallString<256> Buf;
4011 raw_svector_ostream OS(Buf);
4013 StringRef Values = A.front().front().getString();
4014 std::size_t I, End = Values.size();
4015 for (I = 0; I < End; ++I) {
4016 MCAsmMacroArgument Arg;
4017 Arg.push_back(AsmToken(AsmToken::Identifier, Values.slice(I, I+1)));
4019 MCAsmMacroArguments Args;
4020 Args.push_back(Arg);
4022 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
4026 InstantiateMacroLikeBody(M, DirectiveLoc, OS);
4031 bool AsmParser::ParseDirectiveEndr(SMLoc DirectiveLoc) {
4032 if (ActiveMacros.empty())
4033 return TokError("unmatched '.endr' directive");
4035 // The only .repl that should get here are the ones created by
4036 // InstantiateMacroLikeBody.
4037 assert(getLexer().is(AsmToken::EndOfStatement));
4043 bool AsmParser::ParseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
4045 const MCExpr *Value;
4046 SMLoc ExprLoc = getLexer().getLoc();
4047 if (parseExpression(Value))
4049 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4051 return Error(ExprLoc, "unexpected expression in _emit");
4052 uint64_t IntValue = MCE->getValue();
4053 if (!isUIntN(8, IntValue) && !isIntN(8, IntValue))
4054 return Error(ExprLoc, "literal value out of range for directive");
4056 Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, Len));
4060 bool AsmParser::ParseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
4061 const MCExpr *Value;
4062 SMLoc ExprLoc = getLexer().getLoc();
4063 if (parseExpression(Value))
4065 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4067 return Error(ExprLoc, "unexpected expression in align");
4068 uint64_t IntValue = MCE->getValue();
4069 if (!isPowerOf2_64(IntValue))
4070 return Error(ExprLoc, "literal value not a power of two greater then zero");
4072 Info.AsmRewrites->push_back(AsmRewrite(AOK_Align, IDLoc, 5,
4073 Log2_64(IntValue)));
4077 // We are comparing pointers, but the pointers are relative to a single string.
4078 // Thus, this should always be deterministic.
4079 static int RewritesSort(const void *A, const void *B) {
4080 const AsmRewrite *AsmRewriteA = static_cast<const AsmRewrite *>(A);
4081 const AsmRewrite *AsmRewriteB = static_cast<const AsmRewrite *>(B);
4082 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
4084 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
4087 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
4088 // rewrite to the same location. Make sure the SizeDirective rewrite is
4089 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
4090 // ensures the sort algorithm is stable.
4091 if (AsmRewritePrecedence [AsmRewriteA->Kind] >
4092 AsmRewritePrecedence [AsmRewriteB->Kind])
4095 if (AsmRewritePrecedence [AsmRewriteA->Kind] <
4096 AsmRewritePrecedence [AsmRewriteB->Kind])
4098 llvm_unreachable ("Unstable rewrite sort.");
4102 AsmParser::parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
4103 unsigned &NumOutputs, unsigned &NumInputs,
4104 SmallVectorImpl<std::pair<void *, bool> > &OpDecls,
4105 SmallVectorImpl<std::string> &Constraints,
4106 SmallVectorImpl<std::string> &Clobbers,
4107 const MCInstrInfo *MII,
4108 const MCInstPrinter *IP,
4109 MCAsmParserSemaCallback &SI) {
4110 SmallVector<void *, 4> InputDecls;
4111 SmallVector<void *, 4> OutputDecls;
4112 SmallVector<bool, 4> InputDeclsAddressOf;
4113 SmallVector<bool, 4> OutputDeclsAddressOf;
4114 SmallVector<std::string, 4> InputConstraints;
4115 SmallVector<std::string, 4> OutputConstraints;
4116 SmallVector<unsigned, 4> ClobberRegs;
4118 SmallVector<AsmRewrite, 4> AsmStrRewrites;
4123 // While we have input, parse each statement.
4124 unsigned InputIdx = 0;
4125 unsigned OutputIdx = 0;
4126 while (getLexer().isNot(AsmToken::Eof)) {
4127 ParseStatementInfo Info(&AsmStrRewrites);
4128 if (ParseStatement(Info))
4131 if (Info.ParseError)
4134 if (Info.Opcode == ~0U)
4137 const MCInstrDesc &Desc = MII->get(Info.Opcode);
4139 // Build the list of clobbers, outputs and inputs.
4140 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
4141 MCParsedAsmOperand *Operand = Info.ParsedOperands[i];
4144 if (Operand->isImm())
4147 // Register operand.
4148 if (Operand->isReg() && !Operand->needAddressOf()) {
4149 unsigned NumDefs = Desc.getNumDefs();
4151 if (NumDefs && Operand->getMCOperandNum() < NumDefs)
4152 ClobberRegs.push_back(Operand->getReg());
4156 // Expr/Input or Output.
4157 StringRef SymName = Operand->getSymName();
4158 if (SymName.empty())
4161 void *OpDecl = Operand->getOpDecl();
4165 bool isOutput = (i == 1) && Desc.mayStore();
4166 SMLoc Start = SMLoc::getFromPointer(SymName.data());
4169 OutputDecls.push_back(OpDecl);
4170 OutputDeclsAddressOf.push_back(Operand->needAddressOf());
4171 OutputConstraints.push_back('=' + Operand->getConstraint().str());
4172 AsmStrRewrites.push_back(AsmRewrite(AOK_Output, Start, SymName.size()));
4174 InputDecls.push_back(OpDecl);
4175 InputDeclsAddressOf.push_back(Operand->needAddressOf());
4176 InputConstraints.push_back(Operand->getConstraint().str());
4177 AsmStrRewrites.push_back(AsmRewrite(AOK_Input, Start, SymName.size()));
4182 // Set the number of Outputs and Inputs.
4183 NumOutputs = OutputDecls.size();
4184 NumInputs = InputDecls.size();
4186 // Set the unique clobbers.
4187 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
4188 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
4190 Clobbers.assign(ClobberRegs.size(), std::string());
4191 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
4192 raw_string_ostream OS(Clobbers[I]);
4193 IP->printRegName(OS, ClobberRegs[I]);
4196 // Merge the various outputs and inputs. Output are expected first.
4197 if (NumOutputs || NumInputs) {
4198 unsigned NumExprs = NumOutputs + NumInputs;
4199 OpDecls.resize(NumExprs);
4200 Constraints.resize(NumExprs);
4201 for (unsigned i = 0; i < NumOutputs; ++i) {
4202 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
4203 Constraints[i] = OutputConstraints[i];
4205 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
4206 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
4207 Constraints[j] = InputConstraints[i];
4211 // Build the IR assembly string.
4212 std::string AsmStringIR;
4213 raw_string_ostream OS(AsmStringIR);
4214 const char *AsmStart = SrcMgr.getMemoryBuffer(0)->getBufferStart();
4215 const char *AsmEnd = SrcMgr.getMemoryBuffer(0)->getBufferEnd();
4216 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), RewritesSort);
4217 for (SmallVectorImpl<AsmRewrite>::iterator I = AsmStrRewrites.begin(),
4218 E = AsmStrRewrites.end();
4220 AsmRewriteKind Kind = (*I).Kind;
4221 if (Kind == AOK_Delete)
4224 const char *Loc = (*I).Loc.getPointer();
4225 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!");
4227 // Emit everything up to the immediate/expression.
4228 unsigned Len = Loc - AsmStart;
4230 OS << StringRef(AsmStart, Len);
4232 // Skip the original expression.
4233 if (Kind == AOK_Skip) {
4234 AsmStart = Loc + (*I).Len;
4238 unsigned AdditionalSkip = 0;
4239 // Rewrite expressions in $N notation.
4243 OS << "$$" << (*I).Val;
4249 OS << '$' << InputIdx++;
4252 OS << '$' << OutputIdx++;
4254 case AOK_SizeDirective:
4257 case 8: OS << "byte ptr "; break;
4258 case 16: OS << "word ptr "; break;
4259 case 32: OS << "dword ptr "; break;
4260 case 64: OS << "qword ptr "; break;
4261 case 80: OS << "xword ptr "; break;
4262 case 128: OS << "xmmword ptr "; break;
4263 case 256: OS << "ymmword ptr "; break;
4270 unsigned Val = (*I).Val;
4271 OS << ".align " << Val;
4273 // Skip the original immediate.
4274 assert(Val < 10 && "Expected alignment less then 2^10.");
4275 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
4278 case AOK_DotOperator:
4283 // Skip the original expression.
4284 AsmStart = Loc + (*I).Len + AdditionalSkip;
4287 // Emit the remainder of the asm string.
4288 if (AsmStart != AsmEnd)
4289 OS << StringRef(AsmStart, AsmEnd - AsmStart);
4291 AsmString = OS.str();
4295 /// \brief Create an MCAsmParser instance.
4296 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM,
4297 MCContext &C, MCStreamer &Out,
4298 const MCAsmInfo &MAI) {
4299 return new AsmParser(SM, C, Out, MAI);