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 /// \brief The parsed operands from the last parsed statement.
98 SmallVector<MCParsedAsmOperand*, 8> ParsedOperands;
100 /// \brief The opcode from the last parsed instruction.
103 /// \brief 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 /// \brief maps directive names to handler methods in parser
142 /// extensions. Extensions register themselves in this map by calling
143 /// addDirectiveHandler.
144 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
146 /// \brief Map of currently defined macros.
147 StringMap<MCAsmMacro*> MacroMap;
149 /// \brief Stack of active macro instantiations.
150 std::vector<MacroInstantiation*> ActiveMacros;
152 /// \brief 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 /// \brief is Darwin compatibility enabled?
180 /// \brief 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 /// \brief Parse an identifier or string (as a quoted identifier)
239 /// and set \p Res to the identifier contents.
240 virtual bool parseIdentifier(StringRef &Res);
241 virtual void eatToEndOfStatement();
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 areMacrosEnabled() {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 isInsideMacroInstantiation() {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 /// \brief Enter the specified file. This returns true on failure.
305 bool enterIncludeFile(const std::string &Filename);
307 /// \brief Process the specified file for the .incbin directive.
308 /// This returns true on failure.
309 bool processIncbinFile(const std::string &Filename);
311 /// \brief Reset the current lexer position to that given by \p Loc. The
312 /// current token is not set; clients should ensure Lex() is called
315 /// \param InBuffer If not -1, should be the known buffer id that contains the
317 void jumpToLoc(SMLoc Loc, int InBuffer=-1);
319 /// \brief Parse up to the end of statement and a return the contents from the
320 /// current token until the end of the statement; the current token on exit
321 /// will be either the EndOfStatement or EOF.
322 virtual StringRef parseStringToEndOfStatement();
324 /// \brief Parse until the end of a statement or a comma is encountered,
325 /// return the contents from the current token up to the end or comma.
326 StringRef parseStringToComma();
328 bool parseAssignment(StringRef Name, bool allow_redef,
329 bool NoDeadStrip = false);
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,
358 DK_CFI_REGISTER, DK_CFI_WINDOW_SAVE,
359 DK_MACROS_ON, DK_MACROS_OFF, DK_MACRO, DK_ENDM, DK_ENDMACRO, DK_PURGEM,
360 DK_SLEB128, DK_ULEB128
363 /// \brief 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 parseDirectiveCFIWindowSave();
388 bool parseDirectiveCFISections();
389 bool parseDirectiveCFIStartProc();
390 bool parseDirectiveCFIEndProc();
391 bool parseDirectiveCFIDefCfaOffset();
392 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
393 bool parseDirectiveCFIAdjustCfaOffset();
394 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
395 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
396 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
397 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
398 bool parseDirectiveCFIRememberState();
399 bool parseDirectiveCFIRestoreState();
400 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
401 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
402 bool parseDirectiveCFIEscape();
403 bool parseDirectiveCFISignalFrame();
404 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
407 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
408 bool parseDirectiveEndMacro(StringRef Directive);
409 bool parseDirectiveMacro(SMLoc DirectiveLoc);
410 bool parseDirectiveMacrosOnOff(StringRef Directive);
412 // ".bundle_align_mode"
413 bool parseDirectiveBundleAlignMode();
415 bool parseDirectiveBundleLock();
417 bool parseDirectiveBundleUnlock();
420 bool parseDirectiveSpace(StringRef IDVal);
422 // .sleb128 (Signed=true) and .uleb128 (Signed=false)
423 bool parseDirectiveLEB128(bool Signed);
425 /// \brief Parse a directive like ".globl" which
426 /// accepts a single symbol (which should be a label or an external).
427 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);
429 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
431 bool parseDirectiveAbort(); // ".abort"
432 bool parseDirectiveInclude(); // ".include"
433 bool parseDirectiveIncbin(); // ".incbin"
435 bool parseDirectiveIf(SMLoc DirectiveLoc); // ".if"
436 // ".ifb" or ".ifnb", depending on ExpectBlank.
437 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
438 // ".ifc" or ".ifnc", depending on ExpectEqual.
439 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
440 // ".ifdef" or ".ifndef", depending on expect_defined
441 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
442 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
443 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
444 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
445 virtual bool parseEscapedString(std::string &Data);
447 const MCExpr *applyModifierToExpr(const MCExpr *E,
448 MCSymbolRefExpr::VariantKind Variant);
450 // Macro-like directives
451 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
452 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
453 raw_svector_ostream &OS);
454 bool parseDirectiveRept(SMLoc DirectiveLoc); // ".rept"
455 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
456 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
457 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
459 // "_emit" or "__emit"
460 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
464 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
466 void initializeDirectiveKindMap();
472 extern MCAsmParserExtension *createDarwinAsmParser();
473 extern MCAsmParserExtension *createELFAsmParser();
474 extern MCAsmParserExtension *createCOFFAsmParser();
478 enum { DEFAULT_ADDRSPACE = 0 };
480 AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
481 const MCAsmInfo &_MAI)
482 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM),
483 PlatformParser(0), CurBuffer(0), MacrosEnabledFlag(true),
484 CppHashLineNumber(0), AssemblerDialect(~0U), IsDarwin(false),
485 ParsingInlineAsm(false) {
486 // Save the old handler.
487 SavedDiagHandler = SrcMgr.getDiagHandler();
488 SavedDiagContext = SrcMgr.getDiagContext();
489 // Set our own handler which calls the saved handler.
490 SrcMgr.setDiagHandler(DiagHandler, this);
491 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
493 // Initialize the platform / file format parser.
495 // FIXME: This is a hack, we need to (majorly) cleanup how these objects are
497 if (_MAI.hasMicrosoftFastStdCallMangling()) {
498 PlatformParser = createCOFFAsmParser();
499 PlatformParser->Initialize(*this);
500 } else if (_MAI.hasSubsectionsViaSymbols()) {
501 PlatformParser = createDarwinAsmParser();
502 PlatformParser->Initialize(*this);
505 PlatformParser = createELFAsmParser();
506 PlatformParser->Initialize(*this);
509 initializeDirectiveKindMap();
512 AsmParser::~AsmParser() {
513 assert(ActiveMacros.empty() && "Unexpected active macro instantiation!");
515 // Destroy any macros.
516 for (StringMap<MCAsmMacro *>::iterator it = MacroMap.begin(),
519 delete it->getValue();
521 delete PlatformParser;
524 void AsmParser::printMacroInstantiations() {
525 // Print the active macro instantiation stack.
526 for (std::vector<MacroInstantiation *>::const_reverse_iterator
527 it = ActiveMacros.rbegin(),
528 ie = ActiveMacros.rend();
530 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
531 "while in macro instantiation");
534 bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
535 if (FatalAssemblerWarnings)
536 return Error(L, Msg, Ranges);
537 printMessage(L, SourceMgr::DK_Warning, Msg, Ranges);
538 printMacroInstantiations();
542 bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
544 printMessage(L, SourceMgr::DK_Error, Msg, Ranges);
545 printMacroInstantiations();
549 bool AsmParser::enterIncludeFile(const std::string &Filename) {
550 std::string IncludedFile;
551 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
557 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
562 /// Process the specified .incbin file by searching for it in the include paths
563 /// then just emitting the byte contents of the file to the streamer. This
564 /// returns true on failure.
565 bool AsmParser::processIncbinFile(const std::string &Filename) {
566 std::string IncludedFile;
567 int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
571 // Pick up the bytes from the file and emit them.
572 getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer());
576 void AsmParser::jumpToLoc(SMLoc Loc, int InBuffer) {
577 if (InBuffer != -1) {
578 CurBuffer = InBuffer;
580 CurBuffer = SrcMgr.FindBufferContainingLoc(Loc);
582 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer());
585 const AsmToken &AsmParser::Lex() {
586 const AsmToken *tok = &Lexer.Lex();
588 if (tok->is(AsmToken::Eof)) {
589 // If this is the end of an included file, pop the parent file off the
591 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
592 if (ParentIncludeLoc != SMLoc()) {
593 jumpToLoc(ParentIncludeLoc);
598 if (tok->is(AsmToken::Error))
599 Error(Lexer.getErrLoc(), Lexer.getErr());
604 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
605 // Create the initial section, if requested.
606 if (!NoInitialTextSection)
613 AsmCond StartingCondState = TheCondState;
615 // If we are generating dwarf for assembly source files save the initial text
616 // section and generate a .file directive.
617 if (getContext().getGenDwarfForAssembly()) {
618 getContext().setGenDwarfSection(getStreamer().getCurrentSection().first);
619 MCSymbol *SectionStartSym = getContext().CreateTempSymbol();
620 getStreamer().EmitLabel(SectionStartSym);
621 getContext().setGenDwarfSectionStartSym(SectionStartSym);
622 getStreamer().EmitDwarfFileDirective(getContext().nextGenDwarfFileNumber(),
624 getContext().getMainFileName());
627 // While we have input, parse each statement.
628 while (Lexer.isNot(AsmToken::Eof)) {
629 ParseStatementInfo Info;
630 if (!parseStatement(Info))
633 // We had an error, validate that one was emitted and recover by skipping to
635 assert(HadError && "Parse statement returned an error, but none emitted!");
636 eatToEndOfStatement();
639 if (TheCondState.TheCond != StartingCondState.TheCond ||
640 TheCondState.Ignore != StartingCondState.Ignore)
641 return TokError("unmatched .ifs or .elses");
643 // Check to see there are no empty DwarfFile slots.
644 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles =
645 getContext().getMCDwarfFiles();
646 for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
647 if (!MCDwarfFiles[i])
648 TokError("unassigned file number: " + Twine(i) + " for .file directives");
651 // Check to see that all assembler local symbols were actually defined.
652 // Targets that don't do subsections via symbols may not want this, though,
653 // so conservatively exclude them. Only do this if we're finalizing, though,
654 // as otherwise we won't necessarilly have seen everything yet.
655 if (!NoFinalize && MAI.hasSubsectionsViaSymbols()) {
656 const MCContext::SymbolTable &Symbols = getContext().getSymbols();
657 for (MCContext::SymbolTable::const_iterator i = Symbols.begin(),
660 MCSymbol *Sym = i->getValue();
661 // Variable symbols may not be marked as defined, so check those
662 // explicitly. If we know it's a variable, we have a definition for
663 // the purposes of this check.
664 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
665 // FIXME: We would really like to refer back to where the symbol was
666 // first referenced for a source location. We need to add something
667 // to track that. Currently, we just point to the end of the file.
669 getLexer().getLoc(), SourceMgr::DK_Error,
670 "assembler local symbol '" + Sym->getName() + "' not defined");
674 // Finalize the output stream if there are no errors and if the client wants
676 if (!HadError && !NoFinalize)
682 void AsmParser::checkForValidSection() {
683 if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) {
684 TokError("expected section directive before assembly directive");
685 Out.InitToTextSection();
689 /// \brief Throw away the rest of the line for testing purposes.
690 void AsmParser::eatToEndOfStatement() {
691 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
695 if (Lexer.is(AsmToken::EndOfStatement))
699 StringRef AsmParser::parseStringToEndOfStatement() {
700 const char *Start = getTok().getLoc().getPointer();
702 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
705 const char *End = getTok().getLoc().getPointer();
706 return StringRef(Start, End - Start);
709 StringRef AsmParser::parseStringToComma() {
710 const char *Start = getTok().getLoc().getPointer();
712 while (Lexer.isNot(AsmToken::EndOfStatement) &&
713 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
716 const char *End = getTok().getLoc().getPointer();
717 return StringRef(Start, End - Start);
720 /// \brief Parse a paren expression and return it.
721 /// NOTE: This assumes the leading '(' has already been consumed.
723 /// parenexpr ::= expr)
725 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
726 if (parseExpression(Res))
728 if (Lexer.isNot(AsmToken::RParen))
729 return TokError("expected ')' in parentheses expression");
730 EndLoc = Lexer.getTok().getEndLoc();
735 /// \brief Parse a bracket expression and return it.
736 /// NOTE: This assumes the leading '[' has already been consumed.
738 /// bracketexpr ::= expr]
740 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
741 if (parseExpression(Res))
743 if (Lexer.isNot(AsmToken::RBrac))
744 return TokError("expected ']' in brackets expression");
745 EndLoc = Lexer.getTok().getEndLoc();
750 /// \brief Parse a primary expression and return it.
751 /// primaryexpr ::= (parenexpr
752 /// primaryexpr ::= symbol
753 /// primaryexpr ::= number
754 /// primaryexpr ::= '.'
755 /// primaryexpr ::= ~,+,- primaryexpr
756 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
757 SMLoc FirstTokenLoc = getLexer().getLoc();
758 AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
759 switch (FirstTokenKind) {
761 return TokError("unknown token in expression");
762 // If we have an error assume that we've already handled it.
763 case AsmToken::Error:
765 case AsmToken::Exclaim:
766 Lex(); // Eat the operator.
767 if (parsePrimaryExpr(Res, EndLoc))
769 Res = MCUnaryExpr::CreateLNot(Res, getContext());
771 case AsmToken::Dollar:
773 case AsmToken::String:
774 case AsmToken::Identifier: {
775 StringRef Identifier;
776 if (parseIdentifier(Identifier)) {
777 if (FirstTokenKind == AsmToken::Dollar) {
778 if (Lexer.getMAI().getDollarIsPC()) {
779 // This is a '$' reference, which references the current PC. Emit a
780 // temporary label to the streamer and refer to it.
781 MCSymbol *Sym = Ctx.CreateTempSymbol();
783 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None,
785 EndLoc = FirstTokenLoc;
788 return Error(FirstTokenLoc, "invalid token in expression");
793 EndLoc = SMLoc::getFromPointer(Identifier.end());
795 // This is a symbol reference.
796 StringRef SymbolName = Identifier;
797 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
798 std::pair<StringRef, StringRef> Split = Identifier.split('@');
800 // Lookup the symbol variant if used.
801 if (Split.first.size() != Identifier.size()) {
802 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
803 if (Variant != MCSymbolRefExpr::VK_Invalid) {
804 SymbolName = Split.first;
805 } else if (MAI.doesAllowAtInName()) {
806 Variant = MCSymbolRefExpr::VK_None;
808 Variant = MCSymbolRefExpr::VK_None;
809 return TokError("invalid variant '" + Split.second + "'");
813 MCSymbol *Sym = getContext().GetOrCreateSymbol(SymbolName);
815 // If this is an absolute variable reference, substitute it now to preserve
816 // semantics in the face of reassignment.
817 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
819 return Error(EndLoc, "unexpected modifier on variable reference");
821 Res = Sym->getVariableValue();
825 // Otherwise create a symbol ref.
826 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
829 case AsmToken::Integer: {
830 SMLoc Loc = getTok().getLoc();
831 int64_t IntVal = getTok().getIntVal();
832 Res = MCConstantExpr::Create(IntVal, getContext());
833 EndLoc = Lexer.getTok().getEndLoc();
835 // Look for 'b' or 'f' following an Integer as a directional label
836 if (Lexer.getKind() == AsmToken::Identifier) {
837 StringRef IDVal = getTok().getString();
838 // Lookup the symbol variant if used.
839 std::pair<StringRef, StringRef> Split = IDVal.split('@');
840 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
841 if (Split.first.size() != IDVal.size()) {
842 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
843 if (Variant == MCSymbolRefExpr::VK_Invalid) {
844 Variant = MCSymbolRefExpr::VK_None;
845 return TokError("invalid variant '" + Split.second + "'");
849 if (IDVal == "f" || IDVal == "b") {
851 Ctx.GetDirectionalLocalSymbol(IntVal, IDVal == "f" ? 1 : 0);
852 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
853 if (IDVal == "b" && Sym->isUndefined())
854 return Error(Loc, "invalid reference to undefined symbol");
855 EndLoc = Lexer.getTok().getEndLoc();
856 Lex(); // Eat identifier.
861 case AsmToken::Real: {
862 APFloat RealVal(APFloat::IEEEdouble, getTok().getString());
863 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
864 Res = MCConstantExpr::Create(IntVal, getContext());
865 EndLoc = Lexer.getTok().getEndLoc();
869 case AsmToken::Dot: {
870 // This is a '.' reference, which references the current PC. Emit a
871 // temporary label to the streamer and refer to it.
872 MCSymbol *Sym = Ctx.CreateTempSymbol();
874 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
875 EndLoc = Lexer.getTok().getEndLoc();
876 Lex(); // Eat identifier.
879 case AsmToken::LParen:
880 Lex(); // Eat the '('.
881 return parseParenExpr(Res, EndLoc);
882 case AsmToken::LBrac:
883 if (!PlatformParser->HasBracketExpressions())
884 return TokError("brackets expression not supported on this target");
885 Lex(); // Eat the '['.
886 return parseBracketExpr(Res, EndLoc);
887 case AsmToken::Minus:
888 Lex(); // Eat the operator.
889 if (parsePrimaryExpr(Res, EndLoc))
891 Res = MCUnaryExpr::CreateMinus(Res, getContext());
894 Lex(); // Eat the operator.
895 if (parsePrimaryExpr(Res, EndLoc))
897 Res = MCUnaryExpr::CreatePlus(Res, getContext());
899 case AsmToken::Tilde:
900 Lex(); // Eat the operator.
901 if (parsePrimaryExpr(Res, EndLoc))
903 Res = MCUnaryExpr::CreateNot(Res, getContext());
908 bool AsmParser::parseExpression(const MCExpr *&Res) {
910 return parseExpression(Res, EndLoc);
914 AsmParser::applyModifierToExpr(const MCExpr *E,
915 MCSymbolRefExpr::VariantKind Variant) {
916 // Ask the target implementation about this expression first.
917 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
920 // Recurse over the given expression, rebuilding it to apply the given variant
921 // if there is exactly one symbol.
922 switch (E->getKind()) {
924 case MCExpr::Constant:
927 case MCExpr::SymbolRef: {
928 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
930 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
931 TokError("invalid variant on expression '" + getTok().getIdentifier() +
932 "' (already modified)");
936 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext());
939 case MCExpr::Unary: {
940 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
941 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
944 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext());
947 case MCExpr::Binary: {
948 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
949 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
950 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
960 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext());
964 llvm_unreachable("Invalid expression kind!");
967 /// \brief Parse an expression and return it.
969 /// expr ::= expr &&,|| expr -> lowest.
970 /// expr ::= expr |,^,&,! expr
971 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr
972 /// expr ::= expr <<,>> expr
973 /// expr ::= expr +,- expr
974 /// expr ::= expr *,/,% expr -> highest.
975 /// expr ::= primaryexpr
977 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
978 // Parse the expression.
980 if (parsePrimaryExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc))
983 // As a special case, we support 'a op b @ modifier' by rewriting the
984 // expression to include the modifier. This is inefficient, but in general we
985 // expect users to use 'a@modifier op b'.
986 if (Lexer.getKind() == AsmToken::At) {
989 if (Lexer.isNot(AsmToken::Identifier))
990 return TokError("unexpected symbol modifier following '@'");
992 MCSymbolRefExpr::VariantKind Variant =
993 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
994 if (Variant == MCSymbolRefExpr::VK_Invalid)
995 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
997 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
999 return TokError("invalid modifier '" + getTok().getIdentifier() +
1000 "' (no symbols present)");
1007 // Try to constant fold it up front, if possible.
1009 if (Res->EvaluateAsAbsolute(Value))
1010 Res = MCConstantExpr::Create(Value, getContext());
1015 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1017 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1020 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1023 SMLoc StartLoc = Lexer.getLoc();
1024 if (parseExpression(Expr))
1027 if (!Expr->EvaluateAsAbsolute(Res))
1028 return Error(StartLoc, "expected absolute expression");
1033 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
1034 MCBinaryExpr::Opcode &Kind) {
1037 return 0; // not a binop.
1039 // Lowest Precedence: &&, ||
1040 case AsmToken::AmpAmp:
1041 Kind = MCBinaryExpr::LAnd;
1043 case AsmToken::PipePipe:
1044 Kind = MCBinaryExpr::LOr;
1047 // Low Precedence: |, &, ^
1049 // FIXME: gas seems to support '!' as an infix operator?
1050 case AsmToken::Pipe:
1051 Kind = MCBinaryExpr::Or;
1053 case AsmToken::Caret:
1054 Kind = MCBinaryExpr::Xor;
1057 Kind = MCBinaryExpr::And;
1060 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1061 case AsmToken::EqualEqual:
1062 Kind = MCBinaryExpr::EQ;
1064 case AsmToken::ExclaimEqual:
1065 case AsmToken::LessGreater:
1066 Kind = MCBinaryExpr::NE;
1068 case AsmToken::Less:
1069 Kind = MCBinaryExpr::LT;
1071 case AsmToken::LessEqual:
1072 Kind = MCBinaryExpr::LTE;
1074 case AsmToken::Greater:
1075 Kind = MCBinaryExpr::GT;
1077 case AsmToken::GreaterEqual:
1078 Kind = MCBinaryExpr::GTE;
1081 // Intermediate Precedence: <<, >>
1082 case AsmToken::LessLess:
1083 Kind = MCBinaryExpr::Shl;
1085 case AsmToken::GreaterGreater:
1086 Kind = MCBinaryExpr::Shr;
1089 // High Intermediate Precedence: +, -
1090 case AsmToken::Plus:
1091 Kind = MCBinaryExpr::Add;
1093 case AsmToken::Minus:
1094 Kind = MCBinaryExpr::Sub;
1097 // Highest Precedence: *, /, %
1098 case AsmToken::Star:
1099 Kind = MCBinaryExpr::Mul;
1101 case AsmToken::Slash:
1102 Kind = MCBinaryExpr::Div;
1104 case AsmToken::Percent:
1105 Kind = MCBinaryExpr::Mod;
1110 /// \brief Parse all binary operators with precedence >= 'Precedence'.
1111 /// Res contains the LHS of the expression on input.
1112 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1115 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1116 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1118 // If the next token is lower precedence than we are allowed to eat, return
1119 // successfully with what we ate already.
1120 if (TokPrec < Precedence)
1125 // Eat the next primary expression.
1127 if (parsePrimaryExpr(RHS, EndLoc))
1130 // If BinOp binds less tightly with RHS than the operator after RHS, let
1131 // the pending operator take RHS as its LHS.
1132 MCBinaryExpr::Opcode Dummy;
1133 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1134 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1137 // Merge LHS and RHS according to operator.
1138 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
1143 /// ::= EndOfStatement
1144 /// ::= Label* Directive ...Operands... EndOfStatement
1145 /// ::= Label* Identifier OperandList* EndOfStatement
1146 bool AsmParser::parseStatement(ParseStatementInfo &Info) {
1147 if (Lexer.is(AsmToken::EndOfStatement)) {
1153 // Statements always start with an identifier or are a full line comment.
1154 AsmToken ID = getTok();
1155 SMLoc IDLoc = ID.getLoc();
1157 int64_t LocalLabelVal = -1;
1158 // A full line comment is a '#' as the first token.
1159 if (Lexer.is(AsmToken::Hash))
1160 return parseCppHashLineFilenameComment(IDLoc);
1162 // Allow an integer followed by a ':' as a directional local label.
1163 if (Lexer.is(AsmToken::Integer)) {
1164 LocalLabelVal = getTok().getIntVal();
1165 if (LocalLabelVal < 0) {
1166 if (!TheCondState.Ignore)
1167 return TokError("unexpected token at start of statement");
1170 IDVal = getTok().getString();
1171 Lex(); // Consume the integer token to be used as an identifier token.
1172 if (Lexer.getKind() != AsmToken::Colon) {
1173 if (!TheCondState.Ignore)
1174 return TokError("unexpected token at start of statement");
1177 } else if (Lexer.is(AsmToken::Dot)) {
1178 // Treat '.' as a valid identifier in this context.
1181 } else if (parseIdentifier(IDVal)) {
1182 if (!TheCondState.Ignore)
1183 return TokError("unexpected token at start of statement");
1187 // Handle conditional assembly here before checking for skipping. We
1188 // have to do this so that .endif isn't skipped in a ".if 0" block for
1190 StringMap<DirectiveKind>::const_iterator DirKindIt =
1191 DirectiveKindMap.find(IDVal);
1192 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1194 : DirKindIt->getValue();
1199 return parseDirectiveIf(IDLoc);
1201 return parseDirectiveIfb(IDLoc, true);
1203 return parseDirectiveIfb(IDLoc, false);
1205 return parseDirectiveIfc(IDLoc, true);
1207 return parseDirectiveIfc(IDLoc, false);
1209 return parseDirectiveIfdef(IDLoc, true);
1212 return parseDirectiveIfdef(IDLoc, false);
1214 return parseDirectiveElseIf(IDLoc);
1216 return parseDirectiveElse(IDLoc);
1218 return parseDirectiveEndIf(IDLoc);
1221 // Ignore the statement if in the middle of inactive conditional
1223 if (TheCondState.Ignore) {
1224 eatToEndOfStatement();
1228 // FIXME: Recurse on local labels?
1230 // See what kind of statement we have.
1231 switch (Lexer.getKind()) {
1232 case AsmToken::Colon: {
1233 checkForValidSection();
1235 // identifier ':' -> Label.
1238 // Diagnose attempt to use '.' as a label.
1240 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1242 // Diagnose attempt to use a variable as a label.
1244 // FIXME: Diagnostics. Note the location of the definition as a label.
1245 // FIXME: This doesn't diagnose assignment to a symbol which has been
1246 // implicitly marked as external.
1248 if (LocalLabelVal == -1)
1249 Sym = getContext().GetOrCreateSymbol(IDVal);
1251 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
1252 if (!Sym->isUndefined() || Sym->isVariable())
1253 return Error(IDLoc, "invalid symbol redefinition");
1256 if (!ParsingInlineAsm)
1259 // If we are generating dwarf for assembly source files then gather the
1260 // info to make a dwarf label entry for this label if needed.
1261 if (getContext().getGenDwarfForAssembly())
1262 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1265 getTargetParser().onLabelParsed(Sym);
1267 // Consume any end of statement token, if present, to avoid spurious
1268 // AddBlankLine calls().
1269 if (Lexer.is(AsmToken::EndOfStatement)) {
1271 if (Lexer.is(AsmToken::Eof))
1278 case AsmToken::Equal:
1279 // identifier '=' ... -> assignment statement
1282 return parseAssignment(IDVal, true);
1284 default: // Normal instruction or directive.
1288 // If macros are enabled, check to see if this is a macro instantiation.
1289 if (areMacrosEnabled())
1290 if (const MCAsmMacro *M = lookupMacro(IDVal)) {
1291 return handleMacroEntry(M, IDLoc);
1294 // Otherwise, we have a normal instruction or directive.
1296 // Directives start with "."
1297 if (IDVal[0] == '.' && IDVal != ".") {
1298 // There are several entities interested in parsing directives:
1300 // 1. The target-specific assembly parser. Some directives are target
1301 // specific or may potentially behave differently on certain targets.
1302 // 2. Asm parser extensions. For example, platform-specific parsers
1303 // (like the ELF parser) register themselves as extensions.
1304 // 3. The generic directive parser implemented by this class. These are
1305 // all the directives that behave in a target and platform independent
1306 // manner, or at least have a default behavior that's shared between
1307 // all targets and platforms.
1309 // First query the target-specific parser. It will return 'true' if it
1310 // isn't interested in this directive.
1311 if (!getTargetParser().ParseDirective(ID))
1314 // Next, check the extention directive map to see if any extension has
1315 // registered itself to parse this directive.
1316 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
1317 ExtensionDirectiveMap.lookup(IDVal);
1319 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1321 // Finally, if no one else is interested in this directive, it must be
1322 // generic and familiar to this class.
1328 return parseDirectiveSet(IDVal, true);
1330 return parseDirectiveSet(IDVal, false);
1332 return parseDirectiveAscii(IDVal, false);
1335 return parseDirectiveAscii(IDVal, true);
1337 return parseDirectiveValue(1);
1341 return parseDirectiveValue(2);
1345 return parseDirectiveValue(4);
1348 return parseDirectiveValue(8);
1351 return parseDirectiveRealValue(APFloat::IEEEsingle);
1353 return parseDirectiveRealValue(APFloat::IEEEdouble);
1355 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1356 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1359 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1360 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1363 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1365 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1367 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1369 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1371 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1373 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1375 return parseDirectiveOrg();
1377 return parseDirectiveFill();
1379 return parseDirectiveZero();
1381 eatToEndOfStatement(); // .extern is the default, ignore it.
1385 return parseDirectiveSymbolAttribute(MCSA_Global);
1386 case DK_LAZY_REFERENCE:
1387 return parseDirectiveSymbolAttribute(MCSA_LazyReference);
1388 case DK_NO_DEAD_STRIP:
1389 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1390 case DK_SYMBOL_RESOLVER:
1391 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1392 case DK_PRIVATE_EXTERN:
1393 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1395 return parseDirectiveSymbolAttribute(MCSA_Reference);
1396 case DK_WEAK_DEFINITION:
1397 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1398 case DK_WEAK_REFERENCE:
1399 return parseDirectiveSymbolAttribute(MCSA_WeakReference);
1400 case DK_WEAK_DEF_CAN_BE_HIDDEN:
1401 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1404 return parseDirectiveComm(/*IsLocal=*/false);
1406 return parseDirectiveComm(/*IsLocal=*/true);
1408 return parseDirectiveAbort();
1410 return parseDirectiveInclude();
1412 return parseDirectiveIncbin();
1415 return TokError(Twine(IDVal) + " not supported yet");
1417 return parseDirectiveRept(IDLoc);
1419 return parseDirectiveIrp(IDLoc);
1421 return parseDirectiveIrpc(IDLoc);
1423 return parseDirectiveEndr(IDLoc);
1424 case DK_BUNDLE_ALIGN_MODE:
1425 return parseDirectiveBundleAlignMode();
1426 case DK_BUNDLE_LOCK:
1427 return parseDirectiveBundleLock();
1428 case DK_BUNDLE_UNLOCK:
1429 return parseDirectiveBundleUnlock();
1431 return parseDirectiveLEB128(true);
1433 return parseDirectiveLEB128(false);
1436 return parseDirectiveSpace(IDVal);
1438 return parseDirectiveFile(IDLoc);
1440 return parseDirectiveLine();
1442 return parseDirectiveLoc();
1444 return parseDirectiveStabs();
1445 case DK_CFI_SECTIONS:
1446 return parseDirectiveCFISections();
1447 case DK_CFI_STARTPROC:
1448 return parseDirectiveCFIStartProc();
1449 case DK_CFI_ENDPROC:
1450 return parseDirectiveCFIEndProc();
1451 case DK_CFI_DEF_CFA:
1452 return parseDirectiveCFIDefCfa(IDLoc);
1453 case DK_CFI_DEF_CFA_OFFSET:
1454 return parseDirectiveCFIDefCfaOffset();
1455 case DK_CFI_ADJUST_CFA_OFFSET:
1456 return parseDirectiveCFIAdjustCfaOffset();
1457 case DK_CFI_DEF_CFA_REGISTER:
1458 return parseDirectiveCFIDefCfaRegister(IDLoc);
1460 return parseDirectiveCFIOffset(IDLoc);
1461 case DK_CFI_REL_OFFSET:
1462 return parseDirectiveCFIRelOffset(IDLoc);
1463 case DK_CFI_PERSONALITY:
1464 return parseDirectiveCFIPersonalityOrLsda(true);
1466 return parseDirectiveCFIPersonalityOrLsda(false);
1467 case DK_CFI_REMEMBER_STATE:
1468 return parseDirectiveCFIRememberState();
1469 case DK_CFI_RESTORE_STATE:
1470 return parseDirectiveCFIRestoreState();
1471 case DK_CFI_SAME_VALUE:
1472 return parseDirectiveCFISameValue(IDLoc);
1473 case DK_CFI_RESTORE:
1474 return parseDirectiveCFIRestore(IDLoc);
1476 return parseDirectiveCFIEscape();
1477 case DK_CFI_SIGNAL_FRAME:
1478 return parseDirectiveCFISignalFrame();
1479 case DK_CFI_UNDEFINED:
1480 return parseDirectiveCFIUndefined(IDLoc);
1481 case DK_CFI_REGISTER:
1482 return parseDirectiveCFIRegister(IDLoc);
1483 case DK_CFI_WINDOW_SAVE:
1484 return parseDirectiveCFIWindowSave();
1487 return parseDirectiveMacrosOnOff(IDVal);
1489 return parseDirectiveMacro(IDLoc);
1492 return parseDirectiveEndMacro(IDVal);
1494 return parseDirectivePurgeMacro(IDLoc);
1497 return Error(IDLoc, "unknown directive");
1500 // __asm _emit or __asm __emit
1501 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
1502 IDVal == "_EMIT" || IDVal == "__EMIT"))
1503 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
1506 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
1507 return parseDirectiveMSAlign(IDLoc, Info);
1509 checkForValidSection();
1511 // Canonicalize the opcode to lower case.
1512 std::string OpcodeStr = IDVal.lower();
1513 ParseInstructionInfo IInfo(Info.AsmRewrites);
1514 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, IDLoc,
1515 Info.ParsedOperands);
1516 Info.ParseError = HadError;
1518 // Dump the parsed representation, if requested.
1519 if (getShowParsedOperands()) {
1520 SmallString<256> Str;
1521 raw_svector_ostream OS(Str);
1522 OS << "parsed instruction: [";
1523 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
1526 Info.ParsedOperands[i]->print(OS);
1530 printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
1533 // If we are generating dwarf for assembly source files and the current
1534 // section is the initial text section then generate a .loc directive for
1536 if (!HadError && getContext().getGenDwarfForAssembly() &&
1537 getContext().getGenDwarfSection() ==
1538 getStreamer().getCurrentSection().first) {
1540 unsigned Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
1542 // If we previously parsed a cpp hash file line comment then make sure the
1543 // current Dwarf File is for the CppHashFilename if not then emit the
1544 // Dwarf File table for it and adjust the line number for the .loc.
1545 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles =
1546 getContext().getMCDwarfFiles();
1547 if (CppHashFilename.size() != 0) {
1548 if (MCDwarfFiles[getContext().getGenDwarfFileNumber()]->getName() !=
1550 getStreamer().EmitDwarfFileDirective(
1551 getContext().nextGenDwarfFileNumber(), StringRef(),
1554 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's
1555 // cache with the different Loc from the call above we save the last
1556 // info we queried here with SrcMgr.FindLineNumber().
1557 unsigned CppHashLocLineNo;
1558 if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf)
1559 CppHashLocLineNo = LastQueryLine;
1561 CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf);
1562 LastQueryLine = CppHashLocLineNo;
1563 LastQueryIDLoc = CppHashLoc;
1564 LastQueryBuffer = CppHashBuf;
1566 Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo);
1569 getStreamer().EmitDwarfLocDirective(
1570 getContext().getGenDwarfFileNumber(), Line, 0,
1571 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0,
1575 // If parsing succeeded, match the instruction.
1578 HadError = getTargetParser().MatchAndEmitInstruction(
1579 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo,
1583 // Don't skip the rest of the line, the instruction parser is responsible for
1588 /// eatToEndOfLine uses the Lexer to eat the characters to the end of the line
1589 /// since they may not be able to be tokenized to get to the end of line token.
1590 void AsmParser::eatToEndOfLine() {
1591 if (!Lexer.is(AsmToken::EndOfStatement))
1592 Lexer.LexUntilEndOfLine();
1597 /// parseCppHashLineFilenameComment as this:
1598 /// ::= # number "filename"
1599 /// or just as a full line comment if it doesn't have a number and a string.
1600 bool AsmParser::parseCppHashLineFilenameComment(const SMLoc &L) {
1601 Lex(); // Eat the hash token.
1603 if (getLexer().isNot(AsmToken::Integer)) {
1604 // Consume the line since in cases it is not a well-formed line directive,
1605 // as if were simply a full line comment.
1610 int64_t LineNumber = getTok().getIntVal();
1613 if (getLexer().isNot(AsmToken::String)) {
1618 StringRef Filename = getTok().getString();
1619 // Get rid of the enclosing quotes.
1620 Filename = Filename.substr(1, Filename.size() - 2);
1622 // Save the SMLoc, Filename and LineNumber for later use by diagnostics.
1624 CppHashFilename = Filename;
1625 CppHashLineNumber = LineNumber;
1626 CppHashBuf = CurBuffer;
1628 // Ignore any trailing characters, they're just comment.
1633 /// \brief will use the last parsed cpp hash line filename comment
1634 /// for the Filename and LineNo if any in the diagnostic.
1635 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
1636 const AsmParser *Parser = static_cast<const AsmParser *>(Context);
1637 raw_ostream &OS = errs();
1639 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
1640 const SMLoc &DiagLoc = Diag.getLoc();
1641 int DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1642 int CppHashBuf = Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc);
1644 // Like SourceMgr::printMessage() we need to print the include stack if any
1645 // before printing the message.
1646 int DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1647 if (!Parser->SavedDiagHandler && DiagCurBuffer > 0) {
1648 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
1649 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
1652 // If we have not parsed a cpp hash line filename comment or the source
1653 // manager changed or buffer changed (like in a nested include) then just
1654 // print the normal diagnostic using its Filename and LineNo.
1655 if (!Parser->CppHashLineNumber || &DiagSrcMgr != &Parser->SrcMgr ||
1656 DiagBuf != CppHashBuf) {
1657 if (Parser->SavedDiagHandler)
1658 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
1664 // Use the CppHashFilename and calculate a line number based on the
1665 // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for
1667 const std::string &Filename = Parser->CppHashFilename;
1669 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
1670 int CppHashLocLineNo =
1671 Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf);
1673 Parser->CppHashLineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
1675 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
1676 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
1677 Diag.getLineContents(), Diag.getRanges());
1679 if (Parser->SavedDiagHandler)
1680 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
1682 NewDiag.print(0, OS);
1685 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
1686 // difference being that that function accepts '@' as part of identifiers and
1687 // we can't do that. AsmLexer.cpp should probably be changed to handle
1688 // '@' as a special case when needed.
1689 static bool isIdentifierChar(char c) {
1690 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
1694 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
1695 const MCAsmMacroParameters &Parameters,
1696 const MCAsmMacroArguments &A, const SMLoc &L) {
1697 unsigned NParameters = Parameters.size();
1698 if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
1699 return Error(L, "Wrong number of arguments");
1701 // A macro without parameters is handled differently on Darwin:
1702 // gas accepts no arguments and does no substitutions
1703 while (!Body.empty()) {
1704 // Scan for the next substitution.
1705 std::size_t End = Body.size(), Pos = 0;
1706 for (; Pos != End; ++Pos) {
1707 // Check for a substitution or escape.
1708 if (IsDarwin && !NParameters) {
1709 // This macro has no parameters, look for $0, $1, etc.
1710 if (Body[Pos] != '$' || Pos + 1 == End)
1713 char Next = Body[Pos + 1];
1714 if (Next == '$' || Next == 'n' ||
1715 isdigit(static_cast<unsigned char>(Next)))
1718 // This macro has parameters, look for \foo, \bar, etc.
1719 if (Body[Pos] == '\\' && Pos + 1 != End)
1725 OS << Body.slice(0, Pos);
1727 // Check if we reached the end.
1731 if (IsDarwin && !NParameters) {
1732 switch (Body[Pos + 1]) {
1738 // $n => number of arguments
1743 // $[0-9] => argument
1745 // Missing arguments are ignored.
1746 unsigned Index = Body[Pos + 1] - '0';
1747 if (Index >= A.size())
1750 // Otherwise substitute with the token values, with spaces eliminated.
1751 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1752 ie = A[Index].end();
1754 OS << it->getString();
1760 unsigned I = Pos + 1;
1761 while (isIdentifierChar(Body[I]) && I + 1 != End)
1764 const char *Begin = Body.data() + Pos + 1;
1765 StringRef Argument(Begin, I - (Pos + 1));
1767 for (; Index < NParameters; ++Index)
1768 if (Parameters[Index].first == Argument)
1771 if (Index == NParameters) {
1772 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
1775 OS << '\\' << Argument;
1779 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1780 ie = A[Index].end();
1782 if (it->getKind() == AsmToken::String)
1783 OS << it->getStringContents();
1785 OS << it->getString();
1787 Pos += 1 + Argument.size();
1790 // Update the scan point.
1791 Body = Body.substr(Pos);
1797 MacroInstantiation::MacroInstantiation(const MCAsmMacro *M, SMLoc IL, int EB,
1798 SMLoc EL, MemoryBuffer *I)
1799 : TheMacro(M), Instantiation(I), InstantiationLoc(IL), ExitBuffer(EB),
1802 static bool isOperator(AsmToken::TokenKind kind) {
1806 case AsmToken::Plus:
1807 case AsmToken::Minus:
1808 case AsmToken::Tilde:
1809 case AsmToken::Slash:
1810 case AsmToken::Star:
1812 case AsmToken::Equal:
1813 case AsmToken::EqualEqual:
1814 case AsmToken::Pipe:
1815 case AsmToken::PipePipe:
1816 case AsmToken::Caret:
1818 case AsmToken::AmpAmp:
1819 case AsmToken::Exclaim:
1820 case AsmToken::ExclaimEqual:
1821 case AsmToken::Percent:
1822 case AsmToken::Less:
1823 case AsmToken::LessEqual:
1824 case AsmToken::LessLess:
1825 case AsmToken::LessGreater:
1826 case AsmToken::Greater:
1827 case AsmToken::GreaterEqual:
1828 case AsmToken::GreaterGreater:
1833 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
1834 AsmToken::TokenKind &ArgumentDelimiter) {
1835 unsigned ParenLevel = 0;
1836 unsigned AddTokens = 0;
1838 // gas accepts arguments separated by whitespace, except on Darwin
1840 Lexer.setSkipSpace(false);
1843 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) {
1844 Lexer.setSkipSpace(true);
1845 return TokError("unexpected token in macro instantiation");
1848 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) {
1849 // Spaces and commas cannot be mixed to delimit parameters
1850 if (ArgumentDelimiter == AsmToken::Eof)
1851 ArgumentDelimiter = AsmToken::Comma;
1852 else if (ArgumentDelimiter != AsmToken::Comma) {
1853 Lexer.setSkipSpace(true);
1854 return TokError("expected ' ' for macro argument separator");
1859 if (Lexer.is(AsmToken::Space)) {
1860 Lex(); // Eat spaces
1862 // Spaces can delimit parameters, but could also be part an expression.
1863 // If the token after a space is an operator, add the token and the next
1864 // one into this argument
1865 if (ArgumentDelimiter == AsmToken::Space ||
1866 ArgumentDelimiter == AsmToken::Eof) {
1867 if (isOperator(Lexer.getKind())) {
1868 // Check to see whether the token is used as an operator,
1869 // or part of an identifier
1870 const char *NextChar = getTok().getEndLoc().getPointer();
1871 if (*NextChar == ' ')
1875 if (!AddTokens && ParenLevel == 0) {
1876 if (ArgumentDelimiter == AsmToken::Eof &&
1877 !isOperator(Lexer.getKind()))
1878 ArgumentDelimiter = AsmToken::Space;
1884 // handleMacroEntry relies on not advancing the lexer here
1885 // to be able to fill in the remaining default parameter values
1886 if (Lexer.is(AsmToken::EndOfStatement))
1889 // Adjust the current parentheses level.
1890 if (Lexer.is(AsmToken::LParen))
1892 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
1895 // Append the token to the current argument list.
1896 MA.push_back(getTok());
1902 Lexer.setSkipSpace(true);
1903 if (ParenLevel != 0)
1904 return TokError("unbalanced parentheses in macro argument");
1908 // Parse the macro instantiation arguments.
1909 bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
1910 MCAsmMacroArguments &A) {
1911 const unsigned NParameters = M ? M->Parameters.size() : 0;
1912 // Argument delimiter is initially unknown. It will be set by
1913 // parseMacroArgument()
1914 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
1916 // Parse two kinds of macro invocations:
1917 // - macros defined without any parameters accept an arbitrary number of them
1918 // - macros defined with parameters accept at most that many of them
1919 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
1921 MCAsmMacroArgument MA;
1923 if (parseMacroArgument(MA, ArgumentDelimiter))
1926 if (!MA.empty() || !NParameters)
1928 else if (NParameters) {
1929 if (!M->Parameters[Parameter].second.empty())
1930 A.push_back(M->Parameters[Parameter].second);
1933 // At the end of the statement, fill in remaining arguments that have
1934 // default values. If there aren't any, then the next argument is
1935 // required but missing
1936 if (Lexer.is(AsmToken::EndOfStatement)) {
1937 if (NParameters && Parameter < NParameters - 1) {
1938 if (M->Parameters[Parameter + 1].second.empty())
1939 return TokError("macro argument '" +
1940 Twine(M->Parameters[Parameter + 1].first) +
1948 if (Lexer.is(AsmToken::Comma))
1951 return TokError("Too many arguments");
1954 const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) {
1955 StringMap<MCAsmMacro *>::iterator I = MacroMap.find(Name);
1956 return (I == MacroMap.end()) ? NULL : I->getValue();
1959 void AsmParser::defineMacro(StringRef Name, const MCAsmMacro &Macro) {
1960 MacroMap[Name] = new MCAsmMacro(Macro);
1963 void AsmParser::undefineMacro(StringRef Name) {
1964 StringMap<MCAsmMacro *>::iterator I = MacroMap.find(Name);
1965 if (I != MacroMap.end()) {
1966 delete I->getValue();
1971 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
1972 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
1973 // this, although we should protect against infinite loops.
1974 if (ActiveMacros.size() == 20)
1975 return TokError("macros cannot be nested more than 20 levels deep");
1977 MCAsmMacroArguments A;
1978 if (parseMacroArguments(M, A))
1981 // Remove any trailing empty arguments. Do this after-the-fact as we have
1982 // to keep empty arguments in the middle of the list or positionality
1983 // gets off. e.g., "foo 1, , 2" vs. "foo 1, 2,"
1984 while (!A.empty() && A.back().empty())
1987 // Macro instantiation is lexical, unfortunately. We construct a new buffer
1988 // to hold the macro body with substitutions.
1989 SmallString<256> Buf;
1990 StringRef Body = M->Body;
1991 raw_svector_ostream OS(Buf);
1993 if (expandMacro(OS, Body, M->Parameters, A, getTok().getLoc()))
1996 // We include the .endmacro in the buffer as our cue to exit the macro
1998 OS << ".endmacro\n";
2000 MemoryBuffer *Instantiation =
2001 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2003 // Create the macro instantiation object and add to the current macro
2004 // instantiation stack.
2005 MacroInstantiation *MI = new MacroInstantiation(
2006 M, NameLoc, CurBuffer, getTok().getLoc(), Instantiation);
2007 ActiveMacros.push_back(MI);
2009 // Jump to the macro instantiation and prime the lexer.
2010 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
2011 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
2017 void AsmParser::handleMacroExit() {
2018 // Jump to the EndOfStatement we should return to, and consume it.
2019 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2022 // Pop the instantiation entry.
2023 delete ActiveMacros.back();
2024 ActiveMacros.pop_back();
2027 static bool isUsedIn(const MCSymbol *Sym, const MCExpr *Value) {
2028 switch (Value->getKind()) {
2029 case MCExpr::Binary: {
2030 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
2031 return isUsedIn(Sym, BE->getLHS()) || isUsedIn(Sym, BE->getRHS());
2033 case MCExpr::Target:
2034 case MCExpr::Constant:
2036 case MCExpr::SymbolRef: {
2038 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
2040 return isUsedIn(Sym, S.getVariableValue());
2044 return isUsedIn(Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
2047 llvm_unreachable("Unknown expr kind!");
2050 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
2052 // FIXME: Use better location, we should use proper tokens.
2053 SMLoc EqualLoc = Lexer.getLoc();
2055 const MCExpr *Value;
2056 if (parseExpression(Value))
2059 // Note: we don't count b as used in "a = b". This is to allow
2063 if (Lexer.isNot(AsmToken::EndOfStatement))
2064 return TokError("unexpected token in assignment");
2066 // Error on assignment to '.'.
2068 return Error(EqualLoc, ("assignment to pseudo-symbol '.' is unsupported "
2069 "(use '.space' or '.org').)"));
2072 // Eat the end of statement marker.
2075 // Validate that the LHS is allowed to be a variable (either it has not been
2076 // used as a symbol, or it is an absolute symbol).
2077 MCSymbol *Sym = getContext().LookupSymbol(Name);
2079 // Diagnose assignment to a label.
2081 // FIXME: Diagnostics. Note the location of the definition as a label.
2082 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
2083 if (isUsedIn(Sym, Value))
2084 return Error(EqualLoc, "Recursive use of '" + Name + "'");
2085 else if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable())
2086 ; // Allow redefinitions of undefined symbols only used in directives.
2087 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
2088 ; // Allow redefinitions of variables that haven't yet been used.
2089 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
2090 return Error(EqualLoc, "redefinition of '" + Name + "'");
2091 else if (!Sym->isVariable())
2092 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
2093 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
2094 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
2097 // Don't count these checks as uses.
2098 Sym->setUsed(false);
2100 Sym = getContext().GetOrCreateSymbol(Name);
2102 // FIXME: Handle '.'.
2104 // Do the assignment.
2105 Out.EmitAssignment(Sym, Value);
2107 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2112 /// parseIdentifier:
2115 bool AsmParser::parseIdentifier(StringRef &Res) {
2116 // The assembler has relaxed rules for accepting identifiers, in particular we
2117 // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2118 // separate tokens. At this level, we have already lexed so we cannot (currently)
2119 // handle this as a context dependent token, instead we detect adjacent tokens
2120 // and return the combined identifier.
2121 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2122 SMLoc PrefixLoc = getLexer().getLoc();
2124 // Consume the prefix character, and check for a following identifier.
2126 if (Lexer.isNot(AsmToken::Identifier))
2129 // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
2130 if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer())
2133 // Construct the joined identifier and consume the token.
2135 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
2140 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
2143 Res = getTok().getIdentifier();
2145 Lex(); // Consume the identifier token.
2150 /// parseDirectiveSet:
2151 /// ::= .equ identifier ',' expression
2152 /// ::= .equiv identifier ',' expression
2153 /// ::= .set identifier ',' expression
2154 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
2157 if (parseIdentifier(Name))
2158 return TokError("expected identifier after '" + Twine(IDVal) + "'");
2160 if (getLexer().isNot(AsmToken::Comma))
2161 return TokError("unexpected token in '" + Twine(IDVal) + "'");
2164 return parseAssignment(Name, allow_redef, true);
2167 bool AsmParser::parseEscapedString(std::string &Data) {
2168 assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
2171 StringRef Str = getTok().getStringContents();
2172 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2173 if (Str[i] != '\\') {
2178 // Recognize escaped characters. Note that this escape semantics currently
2179 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2182 return TokError("unexpected backslash at end of string");
2184 // Recognize octal sequences.
2185 if ((unsigned)(Str[i] - '0') <= 7) {
2186 // Consume up to three octal characters.
2187 unsigned Value = Str[i] - '0';
2189 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2191 Value = Value * 8 + (Str[i] - '0');
2193 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2195 Value = Value * 8 + (Str[i] - '0');
2200 return TokError("invalid octal escape sequence (out of range)");
2202 Data += (unsigned char)Value;
2206 // Otherwise recognize individual escapes.
2209 // Just reject invalid escape sequences for now.
2210 return TokError("invalid escape sequence (unrecognized character)");
2212 case 'b': Data += '\b'; break;
2213 case 'f': Data += '\f'; break;
2214 case 'n': Data += '\n'; break;
2215 case 'r': Data += '\r'; break;
2216 case 't': Data += '\t'; break;
2217 case '"': Data += '"'; break;
2218 case '\\': Data += '\\'; break;
2225 /// parseDirectiveAscii:
2226 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2227 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2228 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2229 checkForValidSection();
2232 if (getLexer().isNot(AsmToken::String))
2233 return TokError("expected string in '" + Twine(IDVal) + "' directive");
2236 if (parseEscapedString(Data))
2239 getStreamer().EmitBytes(Data);
2241 getStreamer().EmitBytes(StringRef("\0", 1));
2245 if (getLexer().is(AsmToken::EndOfStatement))
2248 if (getLexer().isNot(AsmToken::Comma))
2249 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
2258 /// parseDirectiveValue
2259 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
2260 bool AsmParser::parseDirectiveValue(unsigned Size) {
2261 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2262 checkForValidSection();
2265 const MCExpr *Value;
2266 SMLoc ExprLoc = getLexer().getLoc();
2267 if (parseExpression(Value))
2270 // Special case constant expressions to match code generator.
2271 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2272 assert(Size <= 8 && "Invalid size");
2273 uint64_t IntValue = MCE->getValue();
2274 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
2275 return Error(ExprLoc, "literal value out of range for directive");
2276 getStreamer().EmitIntValue(IntValue, Size);
2278 getStreamer().EmitValue(Value, Size);
2280 if (getLexer().is(AsmToken::EndOfStatement))
2283 // FIXME: Improve diagnostic.
2284 if (getLexer().isNot(AsmToken::Comma))
2285 return TokError("unexpected token in directive");
2294 /// parseDirectiveRealValue
2295 /// ::= (.single | .double) [ expression (, expression)* ]
2296 bool AsmParser::parseDirectiveRealValue(const fltSemantics &Semantics) {
2297 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2298 checkForValidSection();
2301 // We don't truly support arithmetic on floating point expressions, so we
2302 // have to manually parse unary prefixes.
2304 if (getLexer().is(AsmToken::Minus)) {
2307 } else if (getLexer().is(AsmToken::Plus))
2310 if (getLexer().isNot(AsmToken::Integer) &&
2311 getLexer().isNot(AsmToken::Real) &&
2312 getLexer().isNot(AsmToken::Identifier))
2313 return TokError("unexpected token in directive");
2315 // Convert to an APFloat.
2316 APFloat Value(Semantics);
2317 StringRef IDVal = getTok().getString();
2318 if (getLexer().is(AsmToken::Identifier)) {
2319 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
2320 Value = APFloat::getInf(Semantics);
2321 else if (!IDVal.compare_lower("nan"))
2322 Value = APFloat::getNaN(Semantics, false, ~0);
2324 return TokError("invalid floating point literal");
2325 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
2326 APFloat::opInvalidOp)
2327 return TokError("invalid floating point literal");
2331 // Consume the numeric token.
2334 // Emit the value as an integer.
2335 APInt AsInt = Value.bitcastToAPInt();
2336 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
2337 AsInt.getBitWidth() / 8);
2339 if (getLexer().is(AsmToken::EndOfStatement))
2342 if (getLexer().isNot(AsmToken::Comma))
2343 return TokError("unexpected token in directive");
2352 /// parseDirectiveZero
2353 /// ::= .zero expression
2354 bool AsmParser::parseDirectiveZero() {
2355 checkForValidSection();
2358 if (parseAbsoluteExpression(NumBytes))
2362 if (getLexer().is(AsmToken::Comma)) {
2364 if (parseAbsoluteExpression(Val))
2368 if (getLexer().isNot(AsmToken::EndOfStatement))
2369 return TokError("unexpected token in '.zero' directive");
2373 getStreamer().EmitFill(NumBytes, Val);
2378 /// parseDirectiveFill
2379 /// ::= .fill expression [ , expression [ , expression ] ]
2380 bool AsmParser::parseDirectiveFill() {
2381 checkForValidSection();
2384 if (parseAbsoluteExpression(NumValues))
2387 int64_t FillSize = 1;
2388 int64_t FillExpr = 0;
2390 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2391 if (getLexer().isNot(AsmToken::Comma))
2392 return TokError("unexpected token in '.fill' directive");
2395 if (parseAbsoluteExpression(FillSize))
2398 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2399 if (getLexer().isNot(AsmToken::Comma))
2400 return TokError("unexpected token in '.fill' directive");
2403 if (parseAbsoluteExpression(FillExpr))
2406 if (getLexer().isNot(AsmToken::EndOfStatement))
2407 return TokError("unexpected token in '.fill' directive");
2413 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
2414 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
2416 for (uint64_t i = 0, e = NumValues; i != e; ++i)
2417 getStreamer().EmitIntValue(FillExpr, FillSize);
2422 /// parseDirectiveOrg
2423 /// ::= .org expression [ , expression ]
2424 bool AsmParser::parseDirectiveOrg() {
2425 checkForValidSection();
2427 const MCExpr *Offset;
2428 SMLoc Loc = getTok().getLoc();
2429 if (parseExpression(Offset))
2432 // Parse optional fill expression.
2433 int64_t FillExpr = 0;
2434 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2435 if (getLexer().isNot(AsmToken::Comma))
2436 return TokError("unexpected token in '.org' directive");
2439 if (parseAbsoluteExpression(FillExpr))
2442 if (getLexer().isNot(AsmToken::EndOfStatement))
2443 return TokError("unexpected token in '.org' directive");
2448 // Only limited forms of relocatable expressions are accepted here, it
2449 // has to be relative to the current section. The streamer will return
2450 // 'true' if the expression wasn't evaluatable.
2451 if (getStreamer().EmitValueToOffset(Offset, FillExpr))
2452 return Error(Loc, "expected assembly-time absolute expression");
2457 /// parseDirectiveAlign
2458 /// ::= {.align, ...} expression [ , expression [ , expression ]]
2459 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
2460 checkForValidSection();
2462 SMLoc AlignmentLoc = getLexer().getLoc();
2464 if (parseAbsoluteExpression(Alignment))
2468 bool HasFillExpr = false;
2469 int64_t FillExpr = 0;
2470 int64_t MaxBytesToFill = 0;
2471 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2472 if (getLexer().isNot(AsmToken::Comma))
2473 return TokError("unexpected token in directive");
2476 // The fill expression can be omitted while specifying a maximum number of
2477 // alignment bytes, e.g:
2479 if (getLexer().isNot(AsmToken::Comma)) {
2481 if (parseAbsoluteExpression(FillExpr))
2485 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2486 if (getLexer().isNot(AsmToken::Comma))
2487 return TokError("unexpected token in directive");
2490 MaxBytesLoc = getLexer().getLoc();
2491 if (parseAbsoluteExpression(MaxBytesToFill))
2494 if (getLexer().isNot(AsmToken::EndOfStatement))
2495 return TokError("unexpected token in directive");
2504 // Compute alignment in bytes.
2506 // FIXME: Diagnose overflow.
2507 if (Alignment >= 32) {
2508 Error(AlignmentLoc, "invalid alignment value");
2512 Alignment = 1ULL << Alignment;
2514 // Reject alignments that aren't a power of two, for gas compatibility.
2515 if (!isPowerOf2_64(Alignment))
2516 Error(AlignmentLoc, "alignment must be a power of 2");
2519 // Diagnose non-sensical max bytes to align.
2520 if (MaxBytesLoc.isValid()) {
2521 if (MaxBytesToFill < 1) {
2522 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
2523 "many bytes, ignoring maximum bytes expression");
2527 if (MaxBytesToFill >= Alignment) {
2528 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
2534 // Check whether we should use optimal code alignment for this .align
2536 bool UseCodeAlign = getStreamer().getCurrentSection().first->UseCodeAlign();
2537 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
2538 ValueSize == 1 && UseCodeAlign) {
2539 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
2541 // FIXME: Target specific behavior about how the "extra" bytes are filled.
2542 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
2549 /// parseDirectiveFile
2550 /// ::= .file [number] filename
2551 /// ::= .file number directory filename
2552 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
2553 // FIXME: I'm not sure what this is.
2554 int64_t FileNumber = -1;
2555 SMLoc FileNumberLoc = getLexer().getLoc();
2556 if (getLexer().is(AsmToken::Integer)) {
2557 FileNumber = getTok().getIntVal();
2561 return TokError("file number less than one");
2564 if (getLexer().isNot(AsmToken::String))
2565 return TokError("unexpected token in '.file' directive");
2567 // Usually the directory and filename together, otherwise just the directory.
2568 // Allow the strings to have escaped octal character sequence.
2569 std::string Path = getTok().getString();
2570 if (parseEscapedString(Path))
2574 StringRef Directory;
2576 std::string FilenameData;
2577 if (getLexer().is(AsmToken::String)) {
2578 if (FileNumber == -1)
2579 return TokError("explicit path specified, but no file number");
2580 if (parseEscapedString(FilenameData))
2582 Filename = FilenameData;
2589 if (getLexer().isNot(AsmToken::EndOfStatement))
2590 return TokError("unexpected token in '.file' directive");
2592 if (FileNumber == -1)
2593 getStreamer().EmitFileDirective(Filename);
2595 if (getContext().getGenDwarfForAssembly() == true)
2597 "input can't have .file dwarf directives when -g is "
2598 "used to generate dwarf debug info for assembly code");
2600 if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename))
2601 Error(FileNumberLoc, "file number already allocated");
2607 /// parseDirectiveLine
2608 /// ::= .line [number]
2609 bool AsmParser::parseDirectiveLine() {
2610 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2611 if (getLexer().isNot(AsmToken::Integer))
2612 return TokError("unexpected token in '.line' directive");
2614 int64_t LineNumber = getTok().getIntVal();
2618 // FIXME: Do something with the .line.
2621 if (getLexer().isNot(AsmToken::EndOfStatement))
2622 return TokError("unexpected token in '.line' directive");
2627 /// parseDirectiveLoc
2628 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
2629 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
2630 /// The first number is a file number, must have been previously assigned with
2631 /// a .file directive, the second number is the line number and optionally the
2632 /// third number is a column position (zero if not specified). The remaining
2633 /// optional items are .loc sub-directives.
2634 bool AsmParser::parseDirectiveLoc() {
2635 if (getLexer().isNot(AsmToken::Integer))
2636 return TokError("unexpected token in '.loc' directive");
2637 int64_t FileNumber = getTok().getIntVal();
2639 return TokError("file number less than one in '.loc' directive");
2640 if (!getContext().isValidDwarfFileNumber(FileNumber))
2641 return TokError("unassigned file number in '.loc' directive");
2644 int64_t LineNumber = 0;
2645 if (getLexer().is(AsmToken::Integer)) {
2646 LineNumber = getTok().getIntVal();
2648 return TokError("line number less than zero in '.loc' directive");
2652 int64_t ColumnPos = 0;
2653 if (getLexer().is(AsmToken::Integer)) {
2654 ColumnPos = getTok().getIntVal();
2656 return TokError("column position less than zero in '.loc' directive");
2660 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
2662 int64_t Discriminator = 0;
2663 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2665 if (getLexer().is(AsmToken::EndOfStatement))
2669 SMLoc Loc = getTok().getLoc();
2670 if (parseIdentifier(Name))
2671 return TokError("unexpected token in '.loc' directive");
2673 if (Name == "basic_block")
2674 Flags |= DWARF2_FLAG_BASIC_BLOCK;
2675 else if (Name == "prologue_end")
2676 Flags |= DWARF2_FLAG_PROLOGUE_END;
2677 else if (Name == "epilogue_begin")
2678 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
2679 else if (Name == "is_stmt") {
2680 Loc = getTok().getLoc();
2681 const MCExpr *Value;
2682 if (parseExpression(Value))
2684 // The expression must be the constant 0 or 1.
2685 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2686 int Value = MCE->getValue();
2688 Flags &= ~DWARF2_FLAG_IS_STMT;
2689 else if (Value == 1)
2690 Flags |= DWARF2_FLAG_IS_STMT;
2692 return Error(Loc, "is_stmt value not 0 or 1");
2694 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
2696 } else if (Name == "isa") {
2697 Loc = getTok().getLoc();
2698 const MCExpr *Value;
2699 if (parseExpression(Value))
2701 // The expression must be a constant greater or equal to 0.
2702 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2703 int Value = MCE->getValue();
2705 return Error(Loc, "isa number less than zero");
2708 return Error(Loc, "isa number not a constant value");
2710 } else if (Name == "discriminator") {
2711 if (parseAbsoluteExpression(Discriminator))
2714 return Error(Loc, "unknown sub-directive in '.loc' directive");
2717 if (getLexer().is(AsmToken::EndOfStatement))
2722 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
2723 Isa, Discriminator, StringRef());
2728 /// parseDirectiveStabs
2729 /// ::= .stabs string, number, number, number
2730 bool AsmParser::parseDirectiveStabs() {
2731 return TokError("unsupported directive '.stabs'");
2734 /// parseDirectiveCFISections
2735 /// ::= .cfi_sections section [, section]
2736 bool AsmParser::parseDirectiveCFISections() {
2741 if (parseIdentifier(Name))
2742 return TokError("Expected an identifier");
2744 if (Name == ".eh_frame")
2746 else if (Name == ".debug_frame")
2749 if (getLexer().is(AsmToken::Comma)) {
2752 if (parseIdentifier(Name))
2753 return TokError("Expected an identifier");
2755 if (Name == ".eh_frame")
2757 else if (Name == ".debug_frame")
2761 getStreamer().EmitCFISections(EH, Debug);
2765 /// parseDirectiveCFIStartProc
2766 /// ::= .cfi_startproc
2767 bool AsmParser::parseDirectiveCFIStartProc() {
2768 getStreamer().EmitCFIStartProc();
2772 /// parseDirectiveCFIEndProc
2773 /// ::= .cfi_endproc
2774 bool AsmParser::parseDirectiveCFIEndProc() {
2775 getStreamer().EmitCFIEndProc();
2779 /// \brief parse register name or number.
2780 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
2781 SMLoc DirectiveLoc) {
2784 if (getLexer().isNot(AsmToken::Integer)) {
2785 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
2787 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
2789 return parseAbsoluteExpression(Register);
2794 /// parseDirectiveCFIDefCfa
2795 /// ::= .cfi_def_cfa register, offset
2796 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
2797 int64_t Register = 0;
2798 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2801 if (getLexer().isNot(AsmToken::Comma))
2802 return TokError("unexpected token in directive");
2806 if (parseAbsoluteExpression(Offset))
2809 getStreamer().EmitCFIDefCfa(Register, Offset);
2813 /// parseDirectiveCFIDefCfaOffset
2814 /// ::= .cfi_def_cfa_offset offset
2815 bool AsmParser::parseDirectiveCFIDefCfaOffset() {
2817 if (parseAbsoluteExpression(Offset))
2820 getStreamer().EmitCFIDefCfaOffset(Offset);
2824 /// parseDirectiveCFIRegister
2825 /// ::= .cfi_register register, register
2826 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
2827 int64_t Register1 = 0;
2828 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc))
2831 if (getLexer().isNot(AsmToken::Comma))
2832 return TokError("unexpected token in directive");
2835 int64_t Register2 = 0;
2836 if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc))
2839 getStreamer().EmitCFIRegister(Register1, Register2);
2843 /// parseDirectiveCFIWindowSave
2844 /// ::= .cfi_window_save
2845 bool AsmParser::parseDirectiveCFIWindowSave() {
2846 getStreamer().EmitCFIWindowSave();
2850 /// parseDirectiveCFIAdjustCfaOffset
2851 /// ::= .cfi_adjust_cfa_offset adjustment
2852 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
2853 int64_t Adjustment = 0;
2854 if (parseAbsoluteExpression(Adjustment))
2857 getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
2861 /// parseDirectiveCFIDefCfaRegister
2862 /// ::= .cfi_def_cfa_register register
2863 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
2864 int64_t Register = 0;
2865 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2868 getStreamer().EmitCFIDefCfaRegister(Register);
2872 /// parseDirectiveCFIOffset
2873 /// ::= .cfi_offset register, offset
2874 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
2875 int64_t Register = 0;
2878 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2881 if (getLexer().isNot(AsmToken::Comma))
2882 return TokError("unexpected token in directive");
2885 if (parseAbsoluteExpression(Offset))
2888 getStreamer().EmitCFIOffset(Register, Offset);
2892 /// parseDirectiveCFIRelOffset
2893 /// ::= .cfi_rel_offset register, offset
2894 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
2895 int64_t Register = 0;
2897 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2900 if (getLexer().isNot(AsmToken::Comma))
2901 return TokError("unexpected token in directive");
2905 if (parseAbsoluteExpression(Offset))
2908 getStreamer().EmitCFIRelOffset(Register, Offset);
2912 static bool isValidEncoding(int64_t Encoding) {
2913 if (Encoding & ~0xff)
2916 if (Encoding == dwarf::DW_EH_PE_omit)
2919 const unsigned Format = Encoding & 0xf;
2920 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
2921 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
2922 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
2923 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
2926 const unsigned Application = Encoding & 0x70;
2927 if (Application != dwarf::DW_EH_PE_absptr &&
2928 Application != dwarf::DW_EH_PE_pcrel)
2934 /// parseDirectiveCFIPersonalityOrLsda
2935 /// IsPersonality true for cfi_personality, false for cfi_lsda
2936 /// ::= .cfi_personality encoding, [symbol_name]
2937 /// ::= .cfi_lsda encoding, [symbol_name]
2938 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
2939 int64_t Encoding = 0;
2940 if (parseAbsoluteExpression(Encoding))
2942 if (Encoding == dwarf::DW_EH_PE_omit)
2945 if (!isValidEncoding(Encoding))
2946 return TokError("unsupported encoding.");
2948 if (getLexer().isNot(AsmToken::Comma))
2949 return TokError("unexpected token in directive");
2953 if (parseIdentifier(Name))
2954 return TokError("expected identifier in directive");
2956 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
2959 getStreamer().EmitCFIPersonality(Sym, Encoding);
2961 getStreamer().EmitCFILsda(Sym, Encoding);
2965 /// parseDirectiveCFIRememberState
2966 /// ::= .cfi_remember_state
2967 bool AsmParser::parseDirectiveCFIRememberState() {
2968 getStreamer().EmitCFIRememberState();
2972 /// parseDirectiveCFIRestoreState
2973 /// ::= .cfi_remember_state
2974 bool AsmParser::parseDirectiveCFIRestoreState() {
2975 getStreamer().EmitCFIRestoreState();
2979 /// parseDirectiveCFISameValue
2980 /// ::= .cfi_same_value register
2981 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
2982 int64_t Register = 0;
2984 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2987 getStreamer().EmitCFISameValue(Register);
2991 /// parseDirectiveCFIRestore
2992 /// ::= .cfi_restore register
2993 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
2994 int64_t Register = 0;
2995 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2998 getStreamer().EmitCFIRestore(Register);
3002 /// parseDirectiveCFIEscape
3003 /// ::= .cfi_escape expression[,...]
3004 bool AsmParser::parseDirectiveCFIEscape() {
3007 if (parseAbsoluteExpression(CurrValue))
3010 Values.push_back((uint8_t)CurrValue);
3012 while (getLexer().is(AsmToken::Comma)) {
3015 if (parseAbsoluteExpression(CurrValue))
3018 Values.push_back((uint8_t)CurrValue);
3021 getStreamer().EmitCFIEscape(Values);
3025 /// parseDirectiveCFISignalFrame
3026 /// ::= .cfi_signal_frame
3027 bool AsmParser::parseDirectiveCFISignalFrame() {
3028 if (getLexer().isNot(AsmToken::EndOfStatement))
3029 return Error(getLexer().getLoc(),
3030 "unexpected token in '.cfi_signal_frame'");
3032 getStreamer().EmitCFISignalFrame();
3036 /// parseDirectiveCFIUndefined
3037 /// ::= .cfi_undefined register
3038 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
3039 int64_t Register = 0;
3041 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3044 getStreamer().EmitCFIUndefined(Register);
3048 /// parseDirectiveMacrosOnOff
3051 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
3052 if (getLexer().isNot(AsmToken::EndOfStatement))
3053 return Error(getLexer().getLoc(),
3054 "unexpected token in '" + Directive + "' directive");
3056 setMacrosEnabled(Directive == ".macros_on");
3060 /// parseDirectiveMacro
3061 /// ::= .macro name [parameters]
3062 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
3064 if (parseIdentifier(Name))
3065 return TokError("expected identifier in '.macro' directive");
3067 MCAsmMacroParameters Parameters;
3068 // Argument delimiter is initially unknown. It will be set by
3069 // parseMacroArgument()
3070 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
3071 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3073 MCAsmMacroParameter Parameter;
3074 if (parseIdentifier(Parameter.first))
3075 return TokError("expected identifier in '.macro' directive");
3077 if (getLexer().is(AsmToken::Equal)) {
3079 if (parseMacroArgument(Parameter.second, ArgumentDelimiter))
3083 Parameters.push_back(Parameter);
3085 if (getLexer().is(AsmToken::Comma))
3087 else if (getLexer().is(AsmToken::EndOfStatement))
3092 // Eat the end of statement.
3095 AsmToken EndToken, StartToken = getTok();
3097 // Lex the macro definition.
3099 // Check whether we have reached the end of the file.
3100 if (getLexer().is(AsmToken::Eof))
3101 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
3103 // Otherwise, check whether we have reach the .endmacro.
3104 if (getLexer().is(AsmToken::Identifier) &&
3105 (getTok().getIdentifier() == ".endm" ||
3106 getTok().getIdentifier() == ".endmacro")) {
3107 EndToken = getTok();
3109 if (getLexer().isNot(AsmToken::EndOfStatement))
3110 return TokError("unexpected token in '" + EndToken.getIdentifier() +
3115 // Otherwise, scan til the end of the statement.
3116 eatToEndOfStatement();
3119 if (lookupMacro(Name)) {
3120 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
3123 const char *BodyStart = StartToken.getLoc().getPointer();
3124 const char *BodyEnd = EndToken.getLoc().getPointer();
3125 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3126 checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
3127 defineMacro(Name, MCAsmMacro(Name, Body, Parameters));
3131 /// checkForBadMacro
3133 /// With the support added for named parameters there may be code out there that
3134 /// is transitioning from positional parameters. In versions of gas that did
3135 /// not support named parameters they would be ignored on the macro defintion.
3136 /// But to support both styles of parameters this is not possible so if a macro
3137 /// defintion has named parameters but does not use them and has what appears
3138 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
3139 /// warning that the positional parameter found in body which have no effect.
3140 /// Hoping the developer will either remove the named parameters from the macro
3141 /// definiton so the positional parameters get used if that was what was
3142 /// intended or change the macro to use the named parameters. It is possible
3143 /// this warning will trigger when the none of the named parameters are used
3144 /// and the strings like $1 are infact to simply to be passed trough unchanged.
3145 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
3147 MCAsmMacroParameters Parameters) {
3148 // If this macro is not defined with named parameters the warning we are
3149 // checking for here doesn't apply.
3150 unsigned NParameters = Parameters.size();
3151 if (NParameters == 0)
3154 bool NamedParametersFound = false;
3155 bool PositionalParametersFound = false;
3157 // Look at the body of the macro for use of both the named parameters and what
3158 // are likely to be positional parameters. This is what expandMacro() is
3159 // doing when it finds the parameters in the body.
3160 while (!Body.empty()) {
3161 // Scan for the next possible parameter.
3162 std::size_t End = Body.size(), Pos = 0;
3163 for (; Pos != End; ++Pos) {
3164 // Check for a substitution or escape.
3165 // This macro is defined with parameters, look for \foo, \bar, etc.
3166 if (Body[Pos] == '\\' && Pos + 1 != End)
3169 // This macro should have parameters, but look for $0, $1, ..., $n too.
3170 if (Body[Pos] != '$' || Pos + 1 == End)
3172 char Next = Body[Pos + 1];
3173 if (Next == '$' || Next == 'n' ||
3174 isdigit(static_cast<unsigned char>(Next)))
3178 // Check if we reached the end.
3182 if (Body[Pos] == '$') {
3183 switch (Body[Pos + 1]) {
3188 // $n => number of arguments
3190 PositionalParametersFound = true;
3193 // $[0-9] => argument
3195 PositionalParametersFound = true;
3201 unsigned I = Pos + 1;
3202 while (isIdentifierChar(Body[I]) && I + 1 != End)
3205 const char *Begin = Body.data() + Pos + 1;
3206 StringRef Argument(Begin, I - (Pos + 1));
3208 for (; Index < NParameters; ++Index)
3209 if (Parameters[Index].first == Argument)
3212 if (Index == NParameters) {
3213 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
3219 NamedParametersFound = true;
3220 Pos += 1 + Argument.size();
3223 // Update the scan point.
3224 Body = Body.substr(Pos);
3227 if (!NamedParametersFound && PositionalParametersFound)
3228 Warning(DirectiveLoc, "macro defined with named parameters which are not "
3229 "used in macro body, possible positional parameter "
3230 "found in body which will have no effect");
3233 /// parseDirectiveEndMacro
3236 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
3237 if (getLexer().isNot(AsmToken::EndOfStatement))
3238 return TokError("unexpected token in '" + Directive + "' directive");
3240 // If we are inside a macro instantiation, terminate the current
3242 if (isInsideMacroInstantiation()) {
3247 // Otherwise, this .endmacro is a stray entry in the file; well formed
3248 // .endmacro directives are handled during the macro definition parsing.
3249 return TokError("unexpected '" + Directive + "' in file, "
3250 "no current macro definition");
3253 /// parseDirectivePurgeMacro
3255 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
3257 if (parseIdentifier(Name))
3258 return TokError("expected identifier in '.purgem' directive");
3260 if (getLexer().isNot(AsmToken::EndOfStatement))
3261 return TokError("unexpected token in '.purgem' directive");
3263 if (!lookupMacro(Name))
3264 return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
3266 undefineMacro(Name);
3270 /// parseDirectiveBundleAlignMode
3271 /// ::= {.bundle_align_mode} expression
3272 bool AsmParser::parseDirectiveBundleAlignMode() {
3273 checkForValidSection();
3275 // Expect a single argument: an expression that evaluates to a constant
3276 // in the inclusive range 0-30.
3277 SMLoc ExprLoc = getLexer().getLoc();
3278 int64_t AlignSizePow2;
3279 if (parseAbsoluteExpression(AlignSizePow2))
3281 else if (getLexer().isNot(AsmToken::EndOfStatement))
3282 return TokError("unexpected token after expression in"
3283 " '.bundle_align_mode' directive");
3284 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30)
3285 return Error(ExprLoc,
3286 "invalid bundle alignment size (expected between 0 and 30)");
3290 // Because of AlignSizePow2's verified range we can safely truncate it to
3292 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
3296 /// parseDirectiveBundleLock
3297 /// ::= {.bundle_lock} [align_to_end]
3298 bool AsmParser::parseDirectiveBundleLock() {
3299 checkForValidSection();
3300 bool AlignToEnd = false;
3302 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3304 SMLoc Loc = getTok().getLoc();
3305 const char *kInvalidOptionError =
3306 "invalid option for '.bundle_lock' directive";
3308 if (parseIdentifier(Option))
3309 return Error(Loc, kInvalidOptionError);
3311 if (Option != "align_to_end")
3312 return Error(Loc, kInvalidOptionError);
3313 else if (getLexer().isNot(AsmToken::EndOfStatement))
3315 "unexpected token after '.bundle_lock' directive option");
3321 getStreamer().EmitBundleLock(AlignToEnd);
3325 /// parseDirectiveBundleLock
3326 /// ::= {.bundle_lock}
3327 bool AsmParser::parseDirectiveBundleUnlock() {
3328 checkForValidSection();
3330 if (getLexer().isNot(AsmToken::EndOfStatement))
3331 return TokError("unexpected token in '.bundle_unlock' directive");
3334 getStreamer().EmitBundleUnlock();
3338 /// parseDirectiveSpace
3339 /// ::= (.skip | .space) expression [ , expression ]
3340 bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
3341 checkForValidSection();
3344 if (parseAbsoluteExpression(NumBytes))
3347 int64_t FillExpr = 0;
3348 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3349 if (getLexer().isNot(AsmToken::Comma))
3350 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3353 if (parseAbsoluteExpression(FillExpr))
3356 if (getLexer().isNot(AsmToken::EndOfStatement))
3357 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3363 return TokError("invalid number of bytes in '" + Twine(IDVal) +
3366 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
3367 getStreamer().EmitFill(NumBytes, FillExpr);
3372 /// parseDirectiveLEB128
3373 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ]
3374 bool AsmParser::parseDirectiveLEB128(bool Signed) {
3375 checkForValidSection();
3376 const MCExpr *Value;
3379 if (parseExpression(Value))
3383 getStreamer().EmitSLEB128Value(Value);
3385 getStreamer().EmitULEB128Value(Value);
3387 if (getLexer().is(AsmToken::EndOfStatement))
3390 if (getLexer().isNot(AsmToken::Comma))
3391 return TokError("unexpected token in directive");
3398 /// parseDirectiveSymbolAttribute
3399 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
3400 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
3401 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3404 SMLoc Loc = getTok().getLoc();
3406 if (parseIdentifier(Name))
3407 return Error(Loc, "expected identifier in directive");
3409 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3411 // Assembler local symbols don't make any sense here. Complain loudly.
3412 if (Sym->isTemporary())
3413 return Error(Loc, "non-local symbol required in directive");
3415 if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
3416 return Error(Loc, "unable to emit symbol attribute");
3418 if (getLexer().is(AsmToken::EndOfStatement))
3421 if (getLexer().isNot(AsmToken::Comma))
3422 return TokError("unexpected token in directive");
3431 /// parseDirectiveComm
3432 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
3433 bool AsmParser::parseDirectiveComm(bool IsLocal) {
3434 checkForValidSection();
3436 SMLoc IDLoc = getLexer().getLoc();
3438 if (parseIdentifier(Name))
3439 return TokError("expected identifier in directive");
3441 // Handle the identifier as the key symbol.
3442 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3444 if (getLexer().isNot(AsmToken::Comma))
3445 return TokError("unexpected token in directive");
3449 SMLoc SizeLoc = getLexer().getLoc();
3450 if (parseAbsoluteExpression(Size))
3453 int64_t Pow2Alignment = 0;
3454 SMLoc Pow2AlignmentLoc;
3455 if (getLexer().is(AsmToken::Comma)) {
3457 Pow2AlignmentLoc = getLexer().getLoc();
3458 if (parseAbsoluteExpression(Pow2Alignment))
3461 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
3462 if (IsLocal && LCOMM == LCOMM::NoAlignment)
3463 return Error(Pow2AlignmentLoc, "alignment not supported on this target");
3465 // If this target takes alignments in bytes (not log) validate and convert.
3466 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
3467 (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
3468 if (!isPowerOf2_64(Pow2Alignment))
3469 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
3470 Pow2Alignment = Log2_64(Pow2Alignment);
3474 if (getLexer().isNot(AsmToken::EndOfStatement))
3475 return TokError("unexpected token in '.comm' or '.lcomm' directive");
3479 // NOTE: a size of zero for a .comm should create a undefined symbol
3480 // but a size of .lcomm creates a bss symbol of size zero.
3482 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
3483 "be less than zero");
3485 // NOTE: The alignment in the directive is a power of 2 value, the assembler
3486 // may internally end up wanting an alignment in bytes.
3487 // FIXME: Diagnose overflow.
3488 if (Pow2Alignment < 0)
3489 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
3490 "alignment, can't be less than zero");
3492 if (!Sym->isUndefined())
3493 return Error(IDLoc, "invalid symbol redefinition");
3495 // Create the Symbol as a common or local common with Size and Pow2Alignment
3497 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3501 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3505 /// parseDirectiveAbort
3506 /// ::= .abort [... message ...]
3507 bool AsmParser::parseDirectiveAbort() {
3508 // FIXME: Use loc from directive.
3509 SMLoc Loc = getLexer().getLoc();
3511 StringRef Str = parseStringToEndOfStatement();
3512 if (getLexer().isNot(AsmToken::EndOfStatement))
3513 return TokError("unexpected token in '.abort' directive");
3518 Error(Loc, ".abort detected. Assembly stopping.");
3520 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
3521 // FIXME: Actually abort assembly here.
3526 /// parseDirectiveInclude
3527 /// ::= .include "filename"
3528 bool AsmParser::parseDirectiveInclude() {
3529 if (getLexer().isNot(AsmToken::String))
3530 return TokError("expected string in '.include' directive");
3532 // Allow the strings to have escaped octal character sequence.
3533 std::string Filename;
3534 if (parseEscapedString(Filename))
3536 SMLoc IncludeLoc = getLexer().getLoc();
3539 if (getLexer().isNot(AsmToken::EndOfStatement))
3540 return TokError("unexpected token in '.include' directive");
3542 // Attempt to switch the lexer to the included file before consuming the end
3543 // of statement to avoid losing it when we switch.
3544 if (enterIncludeFile(Filename)) {
3545 Error(IncludeLoc, "Could not find include file '" + Filename + "'");
3552 /// parseDirectiveIncbin
3553 /// ::= .incbin "filename"
3554 bool AsmParser::parseDirectiveIncbin() {
3555 if (getLexer().isNot(AsmToken::String))
3556 return TokError("expected string in '.incbin' directive");
3558 // Allow the strings to have escaped octal character sequence.
3559 std::string Filename;
3560 if (parseEscapedString(Filename))
3562 SMLoc IncbinLoc = getLexer().getLoc();
3565 if (getLexer().isNot(AsmToken::EndOfStatement))
3566 return TokError("unexpected token in '.incbin' directive");
3568 // Attempt to process the included file.
3569 if (processIncbinFile(Filename)) {
3570 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
3577 /// parseDirectiveIf
3578 /// ::= .if expression
3579 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc) {
3580 TheCondStack.push_back(TheCondState);
3581 TheCondState.TheCond = AsmCond::IfCond;
3582 if (TheCondState.Ignore) {
3583 eatToEndOfStatement();
3586 if (parseAbsoluteExpression(ExprValue))
3589 if (getLexer().isNot(AsmToken::EndOfStatement))
3590 return TokError("unexpected token in '.if' directive");
3594 TheCondState.CondMet = ExprValue;
3595 TheCondState.Ignore = !TheCondState.CondMet;
3601 /// parseDirectiveIfb
3603 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
3604 TheCondStack.push_back(TheCondState);
3605 TheCondState.TheCond = AsmCond::IfCond;
3607 if (TheCondState.Ignore) {
3608 eatToEndOfStatement();
3610 StringRef Str = parseStringToEndOfStatement();
3612 if (getLexer().isNot(AsmToken::EndOfStatement))
3613 return TokError("unexpected token in '.ifb' directive");
3617 TheCondState.CondMet = ExpectBlank == Str.empty();
3618 TheCondState.Ignore = !TheCondState.CondMet;
3624 /// parseDirectiveIfc
3625 /// ::= .ifc string1, string2
3626 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
3627 TheCondStack.push_back(TheCondState);
3628 TheCondState.TheCond = AsmCond::IfCond;
3630 if (TheCondState.Ignore) {
3631 eatToEndOfStatement();
3633 StringRef Str1 = parseStringToComma();
3635 if (getLexer().isNot(AsmToken::Comma))
3636 return TokError("unexpected token in '.ifc' directive");
3640 StringRef Str2 = parseStringToEndOfStatement();
3642 if (getLexer().isNot(AsmToken::EndOfStatement))
3643 return TokError("unexpected token in '.ifc' directive");
3647 TheCondState.CondMet = ExpectEqual == (Str1 == Str2);
3648 TheCondState.Ignore = !TheCondState.CondMet;
3654 /// parseDirectiveIfdef
3655 /// ::= .ifdef symbol
3656 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
3658 TheCondStack.push_back(TheCondState);
3659 TheCondState.TheCond = AsmCond::IfCond;
3661 if (TheCondState.Ignore) {
3662 eatToEndOfStatement();
3664 if (parseIdentifier(Name))
3665 return TokError("expected identifier after '.ifdef'");
3669 MCSymbol *Sym = getContext().LookupSymbol(Name);
3672 TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined());
3674 TheCondState.CondMet = (Sym == NULL || Sym->isUndefined());
3675 TheCondState.Ignore = !TheCondState.CondMet;
3681 /// parseDirectiveElseIf
3682 /// ::= .elseif expression
3683 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
3684 if (TheCondState.TheCond != AsmCond::IfCond &&
3685 TheCondState.TheCond != AsmCond::ElseIfCond)
3686 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
3688 TheCondState.TheCond = AsmCond::ElseIfCond;
3690 bool LastIgnoreState = false;
3691 if (!TheCondStack.empty())
3692 LastIgnoreState = TheCondStack.back().Ignore;
3693 if (LastIgnoreState || TheCondState.CondMet) {
3694 TheCondState.Ignore = true;
3695 eatToEndOfStatement();
3698 if (parseAbsoluteExpression(ExprValue))
3701 if (getLexer().isNot(AsmToken::EndOfStatement))
3702 return TokError("unexpected token in '.elseif' directive");
3705 TheCondState.CondMet = ExprValue;
3706 TheCondState.Ignore = !TheCondState.CondMet;
3712 /// parseDirectiveElse
3714 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
3715 if (getLexer().isNot(AsmToken::EndOfStatement))
3716 return TokError("unexpected token in '.else' directive");
3720 if (TheCondState.TheCond != AsmCond::IfCond &&
3721 TheCondState.TheCond != AsmCond::ElseIfCond)
3722 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
3724 TheCondState.TheCond = AsmCond::ElseCond;
3725 bool LastIgnoreState = false;
3726 if (!TheCondStack.empty())
3727 LastIgnoreState = TheCondStack.back().Ignore;
3728 if (LastIgnoreState || TheCondState.CondMet)
3729 TheCondState.Ignore = true;
3731 TheCondState.Ignore = false;
3736 /// parseDirectiveEndIf
3738 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
3739 if (getLexer().isNot(AsmToken::EndOfStatement))
3740 return TokError("unexpected token in '.endif' directive");
3744 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
3745 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
3747 if (!TheCondStack.empty()) {
3748 TheCondState = TheCondStack.back();
3749 TheCondStack.pop_back();
3755 void AsmParser::initializeDirectiveKindMap() {
3756 DirectiveKindMap[".set"] = DK_SET;
3757 DirectiveKindMap[".equ"] = DK_EQU;
3758 DirectiveKindMap[".equiv"] = DK_EQUIV;
3759 DirectiveKindMap[".ascii"] = DK_ASCII;
3760 DirectiveKindMap[".asciz"] = DK_ASCIZ;
3761 DirectiveKindMap[".string"] = DK_STRING;
3762 DirectiveKindMap[".byte"] = DK_BYTE;
3763 DirectiveKindMap[".short"] = DK_SHORT;
3764 DirectiveKindMap[".value"] = DK_VALUE;
3765 DirectiveKindMap[".2byte"] = DK_2BYTE;
3766 DirectiveKindMap[".long"] = DK_LONG;
3767 DirectiveKindMap[".int"] = DK_INT;
3768 DirectiveKindMap[".4byte"] = DK_4BYTE;
3769 DirectiveKindMap[".quad"] = DK_QUAD;
3770 DirectiveKindMap[".8byte"] = DK_8BYTE;
3771 DirectiveKindMap[".single"] = DK_SINGLE;
3772 DirectiveKindMap[".float"] = DK_FLOAT;
3773 DirectiveKindMap[".double"] = DK_DOUBLE;
3774 DirectiveKindMap[".align"] = DK_ALIGN;
3775 DirectiveKindMap[".align32"] = DK_ALIGN32;
3776 DirectiveKindMap[".balign"] = DK_BALIGN;
3777 DirectiveKindMap[".balignw"] = DK_BALIGNW;
3778 DirectiveKindMap[".balignl"] = DK_BALIGNL;
3779 DirectiveKindMap[".p2align"] = DK_P2ALIGN;
3780 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
3781 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
3782 DirectiveKindMap[".org"] = DK_ORG;
3783 DirectiveKindMap[".fill"] = DK_FILL;
3784 DirectiveKindMap[".zero"] = DK_ZERO;
3785 DirectiveKindMap[".extern"] = DK_EXTERN;
3786 DirectiveKindMap[".globl"] = DK_GLOBL;
3787 DirectiveKindMap[".global"] = DK_GLOBAL;
3788 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
3789 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
3790 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
3791 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
3792 DirectiveKindMap[".reference"] = DK_REFERENCE;
3793 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
3794 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
3795 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
3796 DirectiveKindMap[".comm"] = DK_COMM;
3797 DirectiveKindMap[".common"] = DK_COMMON;
3798 DirectiveKindMap[".lcomm"] = DK_LCOMM;
3799 DirectiveKindMap[".abort"] = DK_ABORT;
3800 DirectiveKindMap[".include"] = DK_INCLUDE;
3801 DirectiveKindMap[".incbin"] = DK_INCBIN;
3802 DirectiveKindMap[".code16"] = DK_CODE16;
3803 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
3804 DirectiveKindMap[".rept"] = DK_REPT;
3805 DirectiveKindMap[".irp"] = DK_IRP;
3806 DirectiveKindMap[".irpc"] = DK_IRPC;
3807 DirectiveKindMap[".endr"] = DK_ENDR;
3808 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
3809 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
3810 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
3811 DirectiveKindMap[".if"] = DK_IF;
3812 DirectiveKindMap[".ifb"] = DK_IFB;
3813 DirectiveKindMap[".ifnb"] = DK_IFNB;
3814 DirectiveKindMap[".ifc"] = DK_IFC;
3815 DirectiveKindMap[".ifnc"] = DK_IFNC;
3816 DirectiveKindMap[".ifdef"] = DK_IFDEF;
3817 DirectiveKindMap[".ifndef"] = DK_IFNDEF;
3818 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
3819 DirectiveKindMap[".elseif"] = DK_ELSEIF;
3820 DirectiveKindMap[".else"] = DK_ELSE;
3821 DirectiveKindMap[".endif"] = DK_ENDIF;
3822 DirectiveKindMap[".skip"] = DK_SKIP;
3823 DirectiveKindMap[".space"] = DK_SPACE;
3824 DirectiveKindMap[".file"] = DK_FILE;
3825 DirectiveKindMap[".line"] = DK_LINE;
3826 DirectiveKindMap[".loc"] = DK_LOC;
3827 DirectiveKindMap[".stabs"] = DK_STABS;
3828 DirectiveKindMap[".sleb128"] = DK_SLEB128;
3829 DirectiveKindMap[".uleb128"] = DK_ULEB128;
3830 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
3831 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
3832 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
3833 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
3834 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
3835 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
3836 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
3837 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
3838 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
3839 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
3840 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
3841 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
3842 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
3843 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
3844 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
3845 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
3846 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
3847 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
3848 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
3849 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
3850 DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
3851 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
3852 DirectiveKindMap[".macro"] = DK_MACRO;
3853 DirectiveKindMap[".endm"] = DK_ENDM;
3854 DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
3855 DirectiveKindMap[".purgem"] = DK_PURGEM;
3858 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
3859 AsmToken EndToken, StartToken = getTok();
3861 unsigned NestLevel = 0;
3863 // Check whether we have reached the end of the file.
3864 if (getLexer().is(AsmToken::Eof)) {
3865 Error(DirectiveLoc, "no matching '.endr' in definition");
3869 if (Lexer.is(AsmToken::Identifier) &&
3870 (getTok().getIdentifier() == ".rept")) {
3874 // Otherwise, check whether we have reached the .endr.
3875 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
3876 if (NestLevel == 0) {
3877 EndToken = getTok();
3879 if (Lexer.isNot(AsmToken::EndOfStatement)) {
3880 TokError("unexpected token in '.endr' directive");
3888 // Otherwise, scan till the end of the statement.
3889 eatToEndOfStatement();
3892 const char *BodyStart = StartToken.getLoc().getPointer();
3893 const char *BodyEnd = EndToken.getLoc().getPointer();
3894 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3896 // We Are Anonymous.
3898 MCAsmMacroParameters Parameters;
3899 MacroLikeBodies.push_back(MCAsmMacro(Name, Body, Parameters));
3900 return &MacroLikeBodies.back();
3903 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
3904 raw_svector_ostream &OS) {
3907 MemoryBuffer *Instantiation =
3908 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
3910 // Create the macro instantiation object and add to the current macro
3911 // instantiation stack.
3912 MacroInstantiation *MI = new MacroInstantiation(
3913 M, DirectiveLoc, CurBuffer, getTok().getLoc(), Instantiation);
3914 ActiveMacros.push_back(MI);
3916 // Jump to the macro instantiation and prime the lexer.
3917 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
3918 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
3922 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc) {
3924 if (parseAbsoluteExpression(Count))
3925 return TokError("unexpected token in '.rept' directive");
3928 return TokError("Count is negative");
3930 if (Lexer.isNot(AsmToken::EndOfStatement))
3931 return TokError("unexpected token in '.rept' directive");
3933 // Eat the end of statement.
3936 // Lex the rept definition.
3937 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
3941 // Macro instantiation is lexical, unfortunately. We construct a new buffer
3942 // to hold the macro body with substitutions.
3943 SmallString<256> Buf;
3944 MCAsmMacroParameters Parameters;
3945 MCAsmMacroArguments A;
3946 raw_svector_ostream OS(Buf);
3948 if (expandMacro(OS, M->Body, Parameters, A, getTok().getLoc()))
3951 instantiateMacroLikeBody(M, DirectiveLoc, OS);
3956 /// parseDirectiveIrp
3957 /// ::= .irp symbol,values
3958 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
3959 MCAsmMacroParameters Parameters;
3960 MCAsmMacroParameter Parameter;
3962 if (parseIdentifier(Parameter.first))
3963 return TokError("expected identifier in '.irp' directive");
3965 Parameters.push_back(Parameter);
3967 if (Lexer.isNot(AsmToken::Comma))
3968 return TokError("expected comma in '.irp' directive");
3972 MCAsmMacroArguments A;
3973 if (parseMacroArguments(0, A))
3976 // Eat the end of statement.
3979 // Lex the irp definition.
3980 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
3984 // Macro instantiation is lexical, unfortunately. We construct a new buffer
3985 // to hold the macro body with substitutions.
3986 SmallString<256> Buf;
3987 raw_svector_ostream OS(Buf);
3989 for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
3990 MCAsmMacroArguments Args;
3993 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
3997 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4002 /// parseDirectiveIrpc
4003 /// ::= .irpc symbol,values
4004 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
4005 MCAsmMacroParameters Parameters;
4006 MCAsmMacroParameter Parameter;
4008 if (parseIdentifier(Parameter.first))
4009 return TokError("expected identifier in '.irpc' directive");
4011 Parameters.push_back(Parameter);
4013 if (Lexer.isNot(AsmToken::Comma))
4014 return TokError("expected comma in '.irpc' directive");
4018 MCAsmMacroArguments A;
4019 if (parseMacroArguments(0, A))
4022 if (A.size() != 1 || A.front().size() != 1)
4023 return TokError("unexpected token in '.irpc' directive");
4025 // Eat the end of statement.
4028 // Lex the irpc definition.
4029 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4033 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4034 // to hold the macro body with substitutions.
4035 SmallString<256> Buf;
4036 raw_svector_ostream OS(Buf);
4038 StringRef Values = A.front().front().getString();
4039 std::size_t I, End = Values.size();
4040 for (I = 0; I < End; ++I) {
4041 MCAsmMacroArgument Arg;
4042 Arg.push_back(AsmToken(AsmToken::Identifier, Values.slice(I, I + 1)));
4044 MCAsmMacroArguments Args;
4045 Args.push_back(Arg);
4047 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
4051 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4056 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
4057 if (ActiveMacros.empty())
4058 return TokError("unmatched '.endr' directive");
4060 // The only .repl that should get here are the ones created by
4061 // instantiateMacroLikeBody.
4062 assert(getLexer().is(AsmToken::EndOfStatement));
4068 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
4070 const MCExpr *Value;
4071 SMLoc ExprLoc = getLexer().getLoc();
4072 if (parseExpression(Value))
4074 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4076 return Error(ExprLoc, "unexpected expression in _emit");
4077 uint64_t IntValue = MCE->getValue();
4078 if (!isUIntN(8, IntValue) && !isIntN(8, IntValue))
4079 return Error(ExprLoc, "literal value out of range for directive");
4081 Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, Len));
4085 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
4086 const MCExpr *Value;
4087 SMLoc ExprLoc = getLexer().getLoc();
4088 if (parseExpression(Value))
4090 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4092 return Error(ExprLoc, "unexpected expression in align");
4093 uint64_t IntValue = MCE->getValue();
4094 if (!isPowerOf2_64(IntValue))
4095 return Error(ExprLoc, "literal value not a power of two greater then zero");
4097 Info.AsmRewrites->push_back(
4098 AsmRewrite(AOK_Align, IDLoc, 5, Log2_64(IntValue)));
4102 // We are comparing pointers, but the pointers are relative to a single string.
4103 // Thus, this should always be deterministic.
4104 static int rewritesSort(const AsmRewrite *AsmRewriteA,
4105 const AsmRewrite *AsmRewriteB) {
4106 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
4108 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
4111 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
4112 // rewrite to the same location. Make sure the SizeDirective rewrite is
4113 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
4114 // ensures the sort algorithm is stable.
4115 if (AsmRewritePrecedence[AsmRewriteA->Kind] >
4116 AsmRewritePrecedence[AsmRewriteB->Kind])
4119 if (AsmRewritePrecedence[AsmRewriteA->Kind] <
4120 AsmRewritePrecedence[AsmRewriteB->Kind])
4122 llvm_unreachable("Unstable rewrite sort.");
4125 bool AsmParser::parseMSInlineAsm(
4126 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
4127 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls,
4128 SmallVectorImpl<std::string> &Constraints,
4129 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
4130 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
4131 SmallVector<void *, 4> InputDecls;
4132 SmallVector<void *, 4> OutputDecls;
4133 SmallVector<bool, 4> InputDeclsAddressOf;
4134 SmallVector<bool, 4> OutputDeclsAddressOf;
4135 SmallVector<std::string, 4> InputConstraints;
4136 SmallVector<std::string, 4> OutputConstraints;
4137 SmallVector<unsigned, 4> ClobberRegs;
4139 SmallVector<AsmRewrite, 4> AsmStrRewrites;
4144 // While we have input, parse each statement.
4145 unsigned InputIdx = 0;
4146 unsigned OutputIdx = 0;
4147 while (getLexer().isNot(AsmToken::Eof)) {
4148 ParseStatementInfo Info(&AsmStrRewrites);
4149 if (parseStatement(Info))
4152 if (Info.ParseError)
4155 if (Info.Opcode == ~0U)
4158 const MCInstrDesc &Desc = MII->get(Info.Opcode);
4160 // Build the list of clobbers, outputs and inputs.
4161 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
4162 MCParsedAsmOperand *Operand = Info.ParsedOperands[i];
4165 if (Operand->isImm())
4168 // Register operand.
4169 if (Operand->isReg() && !Operand->needAddressOf()) {
4170 unsigned NumDefs = Desc.getNumDefs();
4172 if (NumDefs && Operand->getMCOperandNum() < NumDefs)
4173 ClobberRegs.push_back(Operand->getReg());
4177 // Expr/Input or Output.
4178 StringRef SymName = Operand->getSymName();
4179 if (SymName.empty())
4182 void *OpDecl = Operand->getOpDecl();
4186 bool isOutput = (i == 1) && Desc.mayStore();
4187 SMLoc Start = SMLoc::getFromPointer(SymName.data());
4190 OutputDecls.push_back(OpDecl);
4191 OutputDeclsAddressOf.push_back(Operand->needAddressOf());
4192 OutputConstraints.push_back('=' + Operand->getConstraint().str());
4193 AsmStrRewrites.push_back(AsmRewrite(AOK_Output, Start, SymName.size()));
4195 InputDecls.push_back(OpDecl);
4196 InputDeclsAddressOf.push_back(Operand->needAddressOf());
4197 InputConstraints.push_back(Operand->getConstraint().str());
4198 AsmStrRewrites.push_back(AsmRewrite(AOK_Input, Start, SymName.size()));
4202 // Consider implicit defs to be clobbers. Think of cpuid and push.
4203 const uint16_t *ImpDefs = Desc.getImplicitDefs();
4204 for (unsigned I = 0, E = Desc.getNumImplicitDefs(); I != E; ++I)
4205 ClobberRegs.push_back(ImpDefs[I]);
4208 // Set the number of Outputs and Inputs.
4209 NumOutputs = OutputDecls.size();
4210 NumInputs = InputDecls.size();
4212 // Set the unique clobbers.
4213 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
4214 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
4216 Clobbers.assign(ClobberRegs.size(), std::string());
4217 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
4218 raw_string_ostream OS(Clobbers[I]);
4219 IP->printRegName(OS, ClobberRegs[I]);
4222 // Merge the various outputs and inputs. Output are expected first.
4223 if (NumOutputs || NumInputs) {
4224 unsigned NumExprs = NumOutputs + NumInputs;
4225 OpDecls.resize(NumExprs);
4226 Constraints.resize(NumExprs);
4227 for (unsigned i = 0; i < NumOutputs; ++i) {
4228 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
4229 Constraints[i] = OutputConstraints[i];
4231 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
4232 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
4233 Constraints[j] = InputConstraints[i];
4237 // Build the IR assembly string.
4238 std::string AsmStringIR;
4239 raw_string_ostream OS(AsmStringIR);
4240 const char *AsmStart = SrcMgr.getMemoryBuffer(0)->getBufferStart();
4241 const char *AsmEnd = SrcMgr.getMemoryBuffer(0)->getBufferEnd();
4242 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
4243 for (SmallVectorImpl<AsmRewrite>::iterator I = AsmStrRewrites.begin(),
4244 E = AsmStrRewrites.end();
4246 AsmRewriteKind Kind = (*I).Kind;
4247 if (Kind == AOK_Delete)
4250 const char *Loc = (*I).Loc.getPointer();
4251 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!");
4253 // Emit everything up to the immediate/expression.
4254 unsigned Len = Loc - AsmStart;
4256 OS << StringRef(AsmStart, Len);
4258 // Skip the original expression.
4259 if (Kind == AOK_Skip) {
4260 AsmStart = Loc + (*I).Len;
4264 unsigned AdditionalSkip = 0;
4265 // Rewrite expressions in $N notation.
4270 OS << "$$" << (*I).Val;
4276 OS << '$' << InputIdx++;
4279 OS << '$' << OutputIdx++;
4281 case AOK_SizeDirective:
4284 case 8: OS << "byte ptr "; break;
4285 case 16: OS << "word ptr "; break;
4286 case 32: OS << "dword ptr "; break;
4287 case 64: OS << "qword ptr "; break;
4288 case 80: OS << "xword ptr "; break;
4289 case 128: OS << "xmmword ptr "; break;
4290 case 256: OS << "ymmword ptr "; break;
4297 unsigned Val = (*I).Val;
4298 OS << ".align " << Val;
4300 // Skip the original immediate.
4301 assert(Val < 10 && "Expected alignment less then 2^10.");
4302 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
4305 case AOK_DotOperator:
4306 // Insert the dot if the user omitted it.
4308 if (AsmStringIR.at(AsmStringIR.size() - 1) != '.')
4314 // Skip the original expression.
4315 AsmStart = Loc + (*I).Len + AdditionalSkip;
4318 // Emit the remainder of the asm string.
4319 if (AsmStart != AsmEnd)
4320 OS << StringRef(AsmStart, AsmEnd - AsmStart);
4322 AsmString = OS.str();
4326 /// \brief Create an MCAsmParser instance.
4327 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
4328 MCStreamer &Out, const MCAsmInfo &MAI) {
4329 return new AsmParser(SM, C, Out, MAI);