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");
792 // Parse symbol variant
793 std::pair<StringRef, StringRef> Split;
794 if (!MAI.useParensForSymbolVariant()) {
795 Split = Identifier.split('@');
796 } else if (Lexer.is(AsmToken::LParen)) {
797 Lexer.Lex(); // eat (
799 parseIdentifier(VName);
800 if (Lexer.isNot(AsmToken::RParen)) {
801 return Error(Lexer.getTok().getLoc(),
802 "unexpected token in variant, expected ')'");
804 Lexer.Lex(); // eat )
805 Split = std::make_pair(Identifier, VName);
808 EndLoc = SMLoc::getFromPointer(Identifier.end());
810 // This is a symbol reference.
811 StringRef SymbolName = Identifier;
812 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
814 // Lookup the symbol variant if used.
815 if (Split.second.size()) {
816 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
817 if (Variant != MCSymbolRefExpr::VK_Invalid) {
818 SymbolName = Split.first;
819 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) {
820 Variant = MCSymbolRefExpr::VK_None;
822 Variant = MCSymbolRefExpr::VK_None;
823 return TokError("invalid variant '" + Split.second + "'");
827 MCSymbol *Sym = getContext().GetOrCreateSymbol(SymbolName);
829 // If this is an absolute variable reference, substitute it now to preserve
830 // semantics in the face of reassignment.
831 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
833 return Error(EndLoc, "unexpected modifier on variable reference");
835 Res = Sym->getVariableValue();
839 // Otherwise create a symbol ref.
840 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
843 case AsmToken::Integer: {
844 SMLoc Loc = getTok().getLoc();
845 int64_t IntVal = getTok().getIntVal();
846 Res = MCConstantExpr::Create(IntVal, getContext());
847 EndLoc = Lexer.getTok().getEndLoc();
849 // Look for 'b' or 'f' following an Integer as a directional label
850 if (Lexer.getKind() == AsmToken::Identifier) {
851 StringRef IDVal = getTok().getString();
852 // Lookup the symbol variant if used.
853 std::pair<StringRef, StringRef> Split = IDVal.split('@');
854 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
855 if (Split.first.size() != IDVal.size()) {
856 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
857 if (Variant == MCSymbolRefExpr::VK_Invalid) {
858 Variant = MCSymbolRefExpr::VK_None;
859 return TokError("invalid variant '" + Split.second + "'");
863 if (IDVal == "f" || IDVal == "b") {
865 Ctx.GetDirectionalLocalSymbol(IntVal, IDVal == "f" ? 1 : 0);
866 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
867 if (IDVal == "b" && Sym->isUndefined())
868 return Error(Loc, "invalid reference to undefined symbol");
869 EndLoc = Lexer.getTok().getEndLoc();
870 Lex(); // Eat identifier.
875 case AsmToken::Real: {
876 APFloat RealVal(APFloat::IEEEdouble, getTok().getString());
877 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
878 Res = MCConstantExpr::Create(IntVal, getContext());
879 EndLoc = Lexer.getTok().getEndLoc();
883 case AsmToken::Dot: {
884 // This is a '.' reference, which references the current PC. Emit a
885 // temporary label to the streamer and refer to it.
886 MCSymbol *Sym = Ctx.CreateTempSymbol();
888 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
889 EndLoc = Lexer.getTok().getEndLoc();
890 Lex(); // Eat identifier.
893 case AsmToken::LParen:
894 Lex(); // Eat the '('.
895 return parseParenExpr(Res, EndLoc);
896 case AsmToken::LBrac:
897 if (!PlatformParser->HasBracketExpressions())
898 return TokError("brackets expression not supported on this target");
899 Lex(); // Eat the '['.
900 return parseBracketExpr(Res, EndLoc);
901 case AsmToken::Minus:
902 Lex(); // Eat the operator.
903 if (parsePrimaryExpr(Res, EndLoc))
905 Res = MCUnaryExpr::CreateMinus(Res, getContext());
908 Lex(); // Eat the operator.
909 if (parsePrimaryExpr(Res, EndLoc))
911 Res = MCUnaryExpr::CreatePlus(Res, getContext());
913 case AsmToken::Tilde:
914 Lex(); // Eat the operator.
915 if (parsePrimaryExpr(Res, EndLoc))
917 Res = MCUnaryExpr::CreateNot(Res, getContext());
922 bool AsmParser::parseExpression(const MCExpr *&Res) {
924 return parseExpression(Res, EndLoc);
928 AsmParser::applyModifierToExpr(const MCExpr *E,
929 MCSymbolRefExpr::VariantKind Variant) {
930 // Ask the target implementation about this expression first.
931 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
934 // Recurse over the given expression, rebuilding it to apply the given variant
935 // if there is exactly one symbol.
936 switch (E->getKind()) {
938 case MCExpr::Constant:
941 case MCExpr::SymbolRef: {
942 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
944 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
945 TokError("invalid variant on expression '" + getTok().getIdentifier() +
946 "' (already modified)");
950 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext());
953 case MCExpr::Unary: {
954 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
955 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
958 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext());
961 case MCExpr::Binary: {
962 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
963 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
964 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
974 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext());
978 llvm_unreachable("Invalid expression kind!");
981 /// \brief Parse an expression and return it.
983 /// expr ::= expr &&,|| expr -> lowest.
984 /// expr ::= expr |,^,&,! expr
985 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr
986 /// expr ::= expr <<,>> expr
987 /// expr ::= expr +,- expr
988 /// expr ::= expr *,/,% expr -> highest.
989 /// expr ::= primaryexpr
991 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
992 // Parse the expression.
994 if (parsePrimaryExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc))
997 // As a special case, we support 'a op b @ modifier' by rewriting the
998 // expression to include the modifier. This is inefficient, but in general we
999 // expect users to use 'a@modifier op b'.
1000 if (Lexer.getKind() == AsmToken::At) {
1003 if (Lexer.isNot(AsmToken::Identifier))
1004 return TokError("unexpected symbol modifier following '@'");
1006 MCSymbolRefExpr::VariantKind Variant =
1007 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
1008 if (Variant == MCSymbolRefExpr::VK_Invalid)
1009 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
1011 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
1013 return TokError("invalid modifier '" + getTok().getIdentifier() +
1014 "' (no symbols present)");
1021 // Try to constant fold it up front, if possible.
1023 if (Res->EvaluateAsAbsolute(Value))
1024 Res = MCConstantExpr::Create(Value, getContext());
1029 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1031 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1034 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1037 SMLoc StartLoc = Lexer.getLoc();
1038 if (parseExpression(Expr))
1041 if (!Expr->EvaluateAsAbsolute(Res))
1042 return Error(StartLoc, "expected absolute expression");
1047 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
1048 MCBinaryExpr::Opcode &Kind) {
1051 return 0; // not a binop.
1053 // Lowest Precedence: &&, ||
1054 case AsmToken::AmpAmp:
1055 Kind = MCBinaryExpr::LAnd;
1057 case AsmToken::PipePipe:
1058 Kind = MCBinaryExpr::LOr;
1061 // Low Precedence: |, &, ^
1063 // FIXME: gas seems to support '!' as an infix operator?
1064 case AsmToken::Pipe:
1065 Kind = MCBinaryExpr::Or;
1067 case AsmToken::Caret:
1068 Kind = MCBinaryExpr::Xor;
1071 Kind = MCBinaryExpr::And;
1074 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1075 case AsmToken::EqualEqual:
1076 Kind = MCBinaryExpr::EQ;
1078 case AsmToken::ExclaimEqual:
1079 case AsmToken::LessGreater:
1080 Kind = MCBinaryExpr::NE;
1082 case AsmToken::Less:
1083 Kind = MCBinaryExpr::LT;
1085 case AsmToken::LessEqual:
1086 Kind = MCBinaryExpr::LTE;
1088 case AsmToken::Greater:
1089 Kind = MCBinaryExpr::GT;
1091 case AsmToken::GreaterEqual:
1092 Kind = MCBinaryExpr::GTE;
1095 // Intermediate Precedence: <<, >>
1096 case AsmToken::LessLess:
1097 Kind = MCBinaryExpr::Shl;
1099 case AsmToken::GreaterGreater:
1100 Kind = MCBinaryExpr::Shr;
1103 // High Intermediate Precedence: +, -
1104 case AsmToken::Plus:
1105 Kind = MCBinaryExpr::Add;
1107 case AsmToken::Minus:
1108 Kind = MCBinaryExpr::Sub;
1111 // Highest Precedence: *, /, %
1112 case AsmToken::Star:
1113 Kind = MCBinaryExpr::Mul;
1115 case AsmToken::Slash:
1116 Kind = MCBinaryExpr::Div;
1118 case AsmToken::Percent:
1119 Kind = MCBinaryExpr::Mod;
1124 /// \brief Parse all binary operators with precedence >= 'Precedence'.
1125 /// Res contains the LHS of the expression on input.
1126 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1129 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1130 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1132 // If the next token is lower precedence than we are allowed to eat, return
1133 // successfully with what we ate already.
1134 if (TokPrec < Precedence)
1139 // Eat the next primary expression.
1141 if (parsePrimaryExpr(RHS, EndLoc))
1144 // If BinOp binds less tightly with RHS than the operator after RHS, let
1145 // the pending operator take RHS as its LHS.
1146 MCBinaryExpr::Opcode Dummy;
1147 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1148 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1151 // Merge LHS and RHS according to operator.
1152 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
1157 /// ::= EndOfStatement
1158 /// ::= Label* Directive ...Operands... EndOfStatement
1159 /// ::= Label* Identifier OperandList* EndOfStatement
1160 bool AsmParser::parseStatement(ParseStatementInfo &Info) {
1161 if (Lexer.is(AsmToken::EndOfStatement)) {
1167 // Statements always start with an identifier or are a full line comment.
1168 AsmToken ID = getTok();
1169 SMLoc IDLoc = ID.getLoc();
1171 int64_t LocalLabelVal = -1;
1172 // A full line comment is a '#' as the first token.
1173 if (Lexer.is(AsmToken::Hash))
1174 return parseCppHashLineFilenameComment(IDLoc);
1176 // Allow an integer followed by a ':' as a directional local label.
1177 if (Lexer.is(AsmToken::Integer)) {
1178 LocalLabelVal = getTok().getIntVal();
1179 if (LocalLabelVal < 0) {
1180 if (!TheCondState.Ignore)
1181 return TokError("unexpected token at start of statement");
1184 IDVal = getTok().getString();
1185 Lex(); // Consume the integer token to be used as an identifier token.
1186 if (Lexer.getKind() != AsmToken::Colon) {
1187 if (!TheCondState.Ignore)
1188 return TokError("unexpected token at start of statement");
1191 } else if (Lexer.is(AsmToken::Dot)) {
1192 // Treat '.' as a valid identifier in this context.
1195 } else if (parseIdentifier(IDVal)) {
1196 if (!TheCondState.Ignore)
1197 return TokError("unexpected token at start of statement");
1201 // Handle conditional assembly here before checking for skipping. We
1202 // have to do this so that .endif isn't skipped in a ".if 0" block for
1204 StringMap<DirectiveKind>::const_iterator DirKindIt =
1205 DirectiveKindMap.find(IDVal);
1206 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1208 : DirKindIt->getValue();
1213 return parseDirectiveIf(IDLoc);
1215 return parseDirectiveIfb(IDLoc, true);
1217 return parseDirectiveIfb(IDLoc, false);
1219 return parseDirectiveIfc(IDLoc, true);
1221 return parseDirectiveIfc(IDLoc, false);
1223 return parseDirectiveIfdef(IDLoc, true);
1226 return parseDirectiveIfdef(IDLoc, false);
1228 return parseDirectiveElseIf(IDLoc);
1230 return parseDirectiveElse(IDLoc);
1232 return parseDirectiveEndIf(IDLoc);
1235 // Ignore the statement if in the middle of inactive conditional
1237 if (TheCondState.Ignore) {
1238 eatToEndOfStatement();
1242 // FIXME: Recurse on local labels?
1244 // See what kind of statement we have.
1245 switch (Lexer.getKind()) {
1246 case AsmToken::Colon: {
1247 checkForValidSection();
1249 // identifier ':' -> Label.
1252 // Diagnose attempt to use '.' as a label.
1254 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1256 // Diagnose attempt to use a variable as a label.
1258 // FIXME: Diagnostics. Note the location of the definition as a label.
1259 // FIXME: This doesn't diagnose assignment to a symbol which has been
1260 // implicitly marked as external.
1262 if (LocalLabelVal == -1)
1263 Sym = getContext().GetOrCreateSymbol(IDVal);
1265 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
1266 if (!Sym->isUndefined() || Sym->isVariable())
1267 return Error(IDLoc, "invalid symbol redefinition");
1270 if (!ParsingInlineAsm)
1273 // If we are generating dwarf for assembly source files then gather the
1274 // info to make a dwarf label entry for this label if needed.
1275 if (getContext().getGenDwarfForAssembly())
1276 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1279 getTargetParser().onLabelParsed(Sym);
1281 // Consume any end of statement token, if present, to avoid spurious
1282 // AddBlankLine calls().
1283 if (Lexer.is(AsmToken::EndOfStatement)) {
1285 if (Lexer.is(AsmToken::Eof))
1292 case AsmToken::Equal:
1293 // identifier '=' ... -> assignment statement
1296 return parseAssignment(IDVal, true);
1298 default: // Normal instruction or directive.
1302 // If macros are enabled, check to see if this is a macro instantiation.
1303 if (areMacrosEnabled())
1304 if (const MCAsmMacro *M = lookupMacro(IDVal)) {
1305 return handleMacroEntry(M, IDLoc);
1308 // Otherwise, we have a normal instruction or directive.
1310 // Directives start with "."
1311 if (IDVal[0] == '.' && IDVal != ".") {
1312 // There are several entities interested in parsing directives:
1314 // 1. The target-specific assembly parser. Some directives are target
1315 // specific or may potentially behave differently on certain targets.
1316 // 2. Asm parser extensions. For example, platform-specific parsers
1317 // (like the ELF parser) register themselves as extensions.
1318 // 3. The generic directive parser implemented by this class. These are
1319 // all the directives that behave in a target and platform independent
1320 // manner, or at least have a default behavior that's shared between
1321 // all targets and platforms.
1323 // First query the target-specific parser. It will return 'true' if it
1324 // isn't interested in this directive.
1325 if (!getTargetParser().ParseDirective(ID))
1328 // Next, check the extention directive map to see if any extension has
1329 // registered itself to parse this directive.
1330 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
1331 ExtensionDirectiveMap.lookup(IDVal);
1333 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1335 // Finally, if no one else is interested in this directive, it must be
1336 // generic and familiar to this class.
1342 return parseDirectiveSet(IDVal, true);
1344 return parseDirectiveSet(IDVal, false);
1346 return parseDirectiveAscii(IDVal, false);
1349 return parseDirectiveAscii(IDVal, true);
1351 return parseDirectiveValue(1);
1355 return parseDirectiveValue(2);
1359 return parseDirectiveValue(4);
1362 return parseDirectiveValue(8);
1365 return parseDirectiveRealValue(APFloat::IEEEsingle);
1367 return parseDirectiveRealValue(APFloat::IEEEdouble);
1369 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1370 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1373 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1374 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1377 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1379 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1381 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1383 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1385 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1387 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1389 return parseDirectiveOrg();
1391 return parseDirectiveFill();
1393 return parseDirectiveZero();
1395 eatToEndOfStatement(); // .extern is the default, ignore it.
1399 return parseDirectiveSymbolAttribute(MCSA_Global);
1400 case DK_LAZY_REFERENCE:
1401 return parseDirectiveSymbolAttribute(MCSA_LazyReference);
1402 case DK_NO_DEAD_STRIP:
1403 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1404 case DK_SYMBOL_RESOLVER:
1405 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1406 case DK_PRIVATE_EXTERN:
1407 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1409 return parseDirectiveSymbolAttribute(MCSA_Reference);
1410 case DK_WEAK_DEFINITION:
1411 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1412 case DK_WEAK_REFERENCE:
1413 return parseDirectiveSymbolAttribute(MCSA_WeakReference);
1414 case DK_WEAK_DEF_CAN_BE_HIDDEN:
1415 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1418 return parseDirectiveComm(/*IsLocal=*/false);
1420 return parseDirectiveComm(/*IsLocal=*/true);
1422 return parseDirectiveAbort();
1424 return parseDirectiveInclude();
1426 return parseDirectiveIncbin();
1429 return TokError(Twine(IDVal) + " not supported yet");
1431 return parseDirectiveRept(IDLoc);
1433 return parseDirectiveIrp(IDLoc);
1435 return parseDirectiveIrpc(IDLoc);
1437 return parseDirectiveEndr(IDLoc);
1438 case DK_BUNDLE_ALIGN_MODE:
1439 return parseDirectiveBundleAlignMode();
1440 case DK_BUNDLE_LOCK:
1441 return parseDirectiveBundleLock();
1442 case DK_BUNDLE_UNLOCK:
1443 return parseDirectiveBundleUnlock();
1445 return parseDirectiveLEB128(true);
1447 return parseDirectiveLEB128(false);
1450 return parseDirectiveSpace(IDVal);
1452 return parseDirectiveFile(IDLoc);
1454 return parseDirectiveLine();
1456 return parseDirectiveLoc();
1458 return parseDirectiveStabs();
1459 case DK_CFI_SECTIONS:
1460 return parseDirectiveCFISections();
1461 case DK_CFI_STARTPROC:
1462 return parseDirectiveCFIStartProc();
1463 case DK_CFI_ENDPROC:
1464 return parseDirectiveCFIEndProc();
1465 case DK_CFI_DEF_CFA:
1466 return parseDirectiveCFIDefCfa(IDLoc);
1467 case DK_CFI_DEF_CFA_OFFSET:
1468 return parseDirectiveCFIDefCfaOffset();
1469 case DK_CFI_ADJUST_CFA_OFFSET:
1470 return parseDirectiveCFIAdjustCfaOffset();
1471 case DK_CFI_DEF_CFA_REGISTER:
1472 return parseDirectiveCFIDefCfaRegister(IDLoc);
1474 return parseDirectiveCFIOffset(IDLoc);
1475 case DK_CFI_REL_OFFSET:
1476 return parseDirectiveCFIRelOffset(IDLoc);
1477 case DK_CFI_PERSONALITY:
1478 return parseDirectiveCFIPersonalityOrLsda(true);
1480 return parseDirectiveCFIPersonalityOrLsda(false);
1481 case DK_CFI_REMEMBER_STATE:
1482 return parseDirectiveCFIRememberState();
1483 case DK_CFI_RESTORE_STATE:
1484 return parseDirectiveCFIRestoreState();
1485 case DK_CFI_SAME_VALUE:
1486 return parseDirectiveCFISameValue(IDLoc);
1487 case DK_CFI_RESTORE:
1488 return parseDirectiveCFIRestore(IDLoc);
1490 return parseDirectiveCFIEscape();
1491 case DK_CFI_SIGNAL_FRAME:
1492 return parseDirectiveCFISignalFrame();
1493 case DK_CFI_UNDEFINED:
1494 return parseDirectiveCFIUndefined(IDLoc);
1495 case DK_CFI_REGISTER:
1496 return parseDirectiveCFIRegister(IDLoc);
1497 case DK_CFI_WINDOW_SAVE:
1498 return parseDirectiveCFIWindowSave();
1501 return parseDirectiveMacrosOnOff(IDVal);
1503 return parseDirectiveMacro(IDLoc);
1506 return parseDirectiveEndMacro(IDVal);
1508 return parseDirectivePurgeMacro(IDLoc);
1511 return Error(IDLoc, "unknown directive");
1514 // __asm _emit or __asm __emit
1515 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
1516 IDVal == "_EMIT" || IDVal == "__EMIT"))
1517 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
1520 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
1521 return parseDirectiveMSAlign(IDLoc, Info);
1523 checkForValidSection();
1525 // Canonicalize the opcode to lower case.
1526 std::string OpcodeStr = IDVal.lower();
1527 ParseInstructionInfo IInfo(Info.AsmRewrites);
1528 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, IDLoc,
1529 Info.ParsedOperands);
1530 Info.ParseError = HadError;
1532 // Dump the parsed representation, if requested.
1533 if (getShowParsedOperands()) {
1534 SmallString<256> Str;
1535 raw_svector_ostream OS(Str);
1536 OS << "parsed instruction: [";
1537 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
1540 Info.ParsedOperands[i]->print(OS);
1544 printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
1547 // If we are generating dwarf for assembly source files and the current
1548 // section is the initial text section then generate a .loc directive for
1550 if (!HadError && getContext().getGenDwarfForAssembly() &&
1551 getContext().getGenDwarfSection() ==
1552 getStreamer().getCurrentSection().first) {
1554 unsigned Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
1556 // If we previously parsed a cpp hash file line comment then make sure the
1557 // current Dwarf File is for the CppHashFilename if not then emit the
1558 // Dwarf File table for it and adjust the line number for the .loc.
1559 const SmallVectorImpl<MCDwarfFile *> &MCDwarfFiles =
1560 getContext().getMCDwarfFiles();
1561 if (CppHashFilename.size() != 0) {
1562 if (MCDwarfFiles[getContext().getGenDwarfFileNumber()]->getName() !=
1564 getStreamer().EmitDwarfFileDirective(
1565 getContext().nextGenDwarfFileNumber(), StringRef(),
1568 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's
1569 // cache with the different Loc from the call above we save the last
1570 // info we queried here with SrcMgr.FindLineNumber().
1571 unsigned CppHashLocLineNo;
1572 if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf)
1573 CppHashLocLineNo = LastQueryLine;
1575 CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf);
1576 LastQueryLine = CppHashLocLineNo;
1577 LastQueryIDLoc = CppHashLoc;
1578 LastQueryBuffer = CppHashBuf;
1580 Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo);
1583 getStreamer().EmitDwarfLocDirective(
1584 getContext().getGenDwarfFileNumber(), Line, 0,
1585 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0,
1589 // If parsing succeeded, match the instruction.
1592 HadError = getTargetParser().MatchAndEmitInstruction(
1593 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo,
1597 // Don't skip the rest of the line, the instruction parser is responsible for
1602 /// eatToEndOfLine uses the Lexer to eat the characters to the end of the line
1603 /// since they may not be able to be tokenized to get to the end of line token.
1604 void AsmParser::eatToEndOfLine() {
1605 if (!Lexer.is(AsmToken::EndOfStatement))
1606 Lexer.LexUntilEndOfLine();
1611 /// parseCppHashLineFilenameComment as this:
1612 /// ::= # number "filename"
1613 /// or just as a full line comment if it doesn't have a number and a string.
1614 bool AsmParser::parseCppHashLineFilenameComment(const SMLoc &L) {
1615 Lex(); // Eat the hash token.
1617 if (getLexer().isNot(AsmToken::Integer)) {
1618 // Consume the line since in cases it is not a well-formed line directive,
1619 // as if were simply a full line comment.
1624 int64_t LineNumber = getTok().getIntVal();
1627 if (getLexer().isNot(AsmToken::String)) {
1632 StringRef Filename = getTok().getString();
1633 // Get rid of the enclosing quotes.
1634 Filename = Filename.substr(1, Filename.size() - 2);
1636 // Save the SMLoc, Filename and LineNumber for later use by diagnostics.
1638 CppHashFilename = Filename;
1639 CppHashLineNumber = LineNumber;
1640 CppHashBuf = CurBuffer;
1642 // Ignore any trailing characters, they're just comment.
1647 /// \brief will use the last parsed cpp hash line filename comment
1648 /// for the Filename and LineNo if any in the diagnostic.
1649 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
1650 const AsmParser *Parser = static_cast<const AsmParser *>(Context);
1651 raw_ostream &OS = errs();
1653 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
1654 const SMLoc &DiagLoc = Diag.getLoc();
1655 int DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1656 int CppHashBuf = Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc);
1658 // Like SourceMgr::printMessage() we need to print the include stack if any
1659 // before printing the message.
1660 int DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1661 if (!Parser->SavedDiagHandler && DiagCurBuffer > 0) {
1662 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
1663 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
1666 // If we have not parsed a cpp hash line filename comment or the source
1667 // manager changed or buffer changed (like in a nested include) then just
1668 // print the normal diagnostic using its Filename and LineNo.
1669 if (!Parser->CppHashLineNumber || &DiagSrcMgr != &Parser->SrcMgr ||
1670 DiagBuf != CppHashBuf) {
1671 if (Parser->SavedDiagHandler)
1672 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
1678 // Use the CppHashFilename and calculate a line number based on the
1679 // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for
1681 const std::string &Filename = Parser->CppHashFilename;
1683 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
1684 int CppHashLocLineNo =
1685 Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf);
1687 Parser->CppHashLineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
1689 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
1690 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
1691 Diag.getLineContents(), Diag.getRanges());
1693 if (Parser->SavedDiagHandler)
1694 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
1696 NewDiag.print(0, OS);
1699 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
1700 // difference being that that function accepts '@' as part of identifiers and
1701 // we can't do that. AsmLexer.cpp should probably be changed to handle
1702 // '@' as a special case when needed.
1703 static bool isIdentifierChar(char c) {
1704 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
1708 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
1709 const MCAsmMacroParameters &Parameters,
1710 const MCAsmMacroArguments &A, const SMLoc &L) {
1711 unsigned NParameters = Parameters.size();
1712 if (NParameters != 0 && NParameters != A.size())
1713 return Error(L, "Wrong number of arguments");
1715 // A macro without parameters is handled differently on Darwin:
1716 // gas accepts no arguments and does no substitutions
1717 while (!Body.empty()) {
1718 // Scan for the next substitution.
1719 std::size_t End = Body.size(), Pos = 0;
1720 for (; Pos != End; ++Pos) {
1721 // Check for a substitution or escape.
1723 // This macro has no parameters, look for $0, $1, etc.
1724 if (Body[Pos] != '$' || Pos + 1 == End)
1727 char Next = Body[Pos + 1];
1728 if (Next == '$' || Next == 'n' ||
1729 isdigit(static_cast<unsigned char>(Next)))
1732 // This macro has parameters, look for \foo, \bar, etc.
1733 if (Body[Pos] == '\\' && Pos + 1 != End)
1739 OS << Body.slice(0, Pos);
1741 // Check if we reached the end.
1746 switch (Body[Pos + 1]) {
1752 // $n => number of arguments
1757 // $[0-9] => argument
1759 // Missing arguments are ignored.
1760 unsigned Index = Body[Pos + 1] - '0';
1761 if (Index >= A.size())
1764 // Otherwise substitute with the token values, with spaces eliminated.
1765 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1766 ie = A[Index].end();
1768 OS << it->getString();
1774 unsigned I = Pos + 1;
1775 while (isIdentifierChar(Body[I]) && I + 1 != End)
1778 const char *Begin = Body.data() + Pos + 1;
1779 StringRef Argument(Begin, I - (Pos + 1));
1781 for (; Index < NParameters; ++Index)
1782 if (Parameters[Index].first == Argument)
1785 if (Index == NParameters) {
1786 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
1789 OS << '\\' << Argument;
1793 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1794 ie = A[Index].end();
1796 if (it->getKind() == AsmToken::String)
1797 OS << it->getStringContents();
1799 OS << it->getString();
1801 Pos += 1 + Argument.size();
1804 // Update the scan point.
1805 Body = Body.substr(Pos);
1811 MacroInstantiation::MacroInstantiation(const MCAsmMacro *M, SMLoc IL, int EB,
1812 SMLoc EL, MemoryBuffer *I)
1813 : TheMacro(M), Instantiation(I), InstantiationLoc(IL), ExitBuffer(EB),
1816 static bool isOperator(AsmToken::TokenKind kind) {
1820 case AsmToken::Plus:
1821 case AsmToken::Minus:
1822 case AsmToken::Tilde:
1823 case AsmToken::Slash:
1824 case AsmToken::Star:
1826 case AsmToken::Equal:
1827 case AsmToken::EqualEqual:
1828 case AsmToken::Pipe:
1829 case AsmToken::PipePipe:
1830 case AsmToken::Caret:
1832 case AsmToken::AmpAmp:
1833 case AsmToken::Exclaim:
1834 case AsmToken::ExclaimEqual:
1835 case AsmToken::Percent:
1836 case AsmToken::Less:
1837 case AsmToken::LessEqual:
1838 case AsmToken::LessLess:
1839 case AsmToken::LessGreater:
1840 case AsmToken::Greater:
1841 case AsmToken::GreaterEqual:
1842 case AsmToken::GreaterGreater:
1847 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA,
1848 AsmToken::TokenKind &ArgumentDelimiter) {
1849 unsigned ParenLevel = 0;
1850 unsigned AddTokens = 0;
1852 // gas accepts arguments separated by whitespace, except on Darwin
1854 Lexer.setSkipSpace(false);
1857 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) {
1858 Lexer.setSkipSpace(true);
1859 return TokError("unexpected token in macro instantiation");
1862 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) {
1863 // Spaces and commas cannot be mixed to delimit parameters
1864 if (ArgumentDelimiter == AsmToken::Eof)
1865 ArgumentDelimiter = AsmToken::Comma;
1866 else if (ArgumentDelimiter != AsmToken::Comma) {
1867 Lexer.setSkipSpace(true);
1868 return TokError("expected ' ' for macro argument separator");
1873 if (Lexer.is(AsmToken::Space)) {
1874 Lex(); // Eat spaces
1876 // Spaces can delimit parameters, but could also be part an expression.
1877 // If the token after a space is an operator, add the token and the next
1878 // one into this argument
1879 if (ArgumentDelimiter == AsmToken::Space ||
1880 ArgumentDelimiter == AsmToken::Eof) {
1881 if (isOperator(Lexer.getKind())) {
1882 // Check to see whether the token is used as an operator,
1883 // or part of an identifier
1884 const char *NextChar = getTok().getEndLoc().getPointer();
1885 if (*NextChar == ' ')
1889 if (!AddTokens && ParenLevel == 0) {
1890 if (ArgumentDelimiter == AsmToken::Eof &&
1891 !isOperator(Lexer.getKind()))
1892 ArgumentDelimiter = AsmToken::Space;
1898 // handleMacroEntry relies on not advancing the lexer here
1899 // to be able to fill in the remaining default parameter values
1900 if (Lexer.is(AsmToken::EndOfStatement))
1903 // Adjust the current parentheses level.
1904 if (Lexer.is(AsmToken::LParen))
1906 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
1909 // Append the token to the current argument list.
1910 MA.push_back(getTok());
1916 Lexer.setSkipSpace(true);
1917 if (ParenLevel != 0)
1918 return TokError("unbalanced parentheses in macro argument");
1922 // Parse the macro instantiation arguments.
1923 bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
1924 MCAsmMacroArguments &A) {
1925 const unsigned NParameters = M ? M->Parameters.size() : 0;
1926 // Argument delimiter is initially unknown. It will be set by
1927 // parseMacroArgument()
1928 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
1930 // Parse two kinds of macro invocations:
1931 // - macros defined without any parameters accept an arbitrary number of them
1932 // - macros defined with parameters accept at most that many of them
1933 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
1935 MCAsmMacroArgument MA;
1937 if (parseMacroArgument(MA, ArgumentDelimiter))
1940 if (!MA.empty() || !NParameters)
1942 else if (NParameters) {
1943 if (!M->Parameters[Parameter].second.empty())
1944 A.push_back(M->Parameters[Parameter].second);
1947 // At the end of the statement, fill in remaining arguments that have
1948 // default values. If there aren't any, then the next argument is
1949 // required but missing
1950 if (Lexer.is(AsmToken::EndOfStatement)) {
1951 if (NParameters && Parameter < NParameters - 1) {
1952 if (M->Parameters[Parameter + 1].second.empty())
1953 return TokError("macro argument '" +
1954 Twine(M->Parameters[Parameter + 1].first) +
1962 if (Lexer.is(AsmToken::Comma))
1965 return TokError("Too many arguments");
1968 const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) {
1969 StringMap<MCAsmMacro *>::iterator I = MacroMap.find(Name);
1970 return (I == MacroMap.end()) ? NULL : I->getValue();
1973 void AsmParser::defineMacro(StringRef Name, const MCAsmMacro &Macro) {
1974 MacroMap[Name] = new MCAsmMacro(Macro);
1977 void AsmParser::undefineMacro(StringRef Name) {
1978 StringMap<MCAsmMacro *>::iterator I = MacroMap.find(Name);
1979 if (I != MacroMap.end()) {
1980 delete I->getValue();
1985 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
1986 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
1987 // this, although we should protect against infinite loops.
1988 if (ActiveMacros.size() == 20)
1989 return TokError("macros cannot be nested more than 20 levels deep");
1991 MCAsmMacroArguments A;
1992 if (parseMacroArguments(M, A))
1995 // Remove any trailing empty arguments. Do this after-the-fact as we have
1996 // to keep empty arguments in the middle of the list or positionality
1997 // gets off. e.g., "foo 1, , 2" vs. "foo 1, 2,"
1998 while (!A.empty() && A.back().empty())
2001 // Macro instantiation is lexical, unfortunately. We construct a new buffer
2002 // to hold the macro body with substitutions.
2003 SmallString<256> Buf;
2004 StringRef Body = M->Body;
2005 raw_svector_ostream OS(Buf);
2007 if (expandMacro(OS, Body, M->Parameters, A, getTok().getLoc()))
2010 // We include the .endmacro in the buffer as our cue to exit the macro
2012 OS << ".endmacro\n";
2014 MemoryBuffer *Instantiation =
2015 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2017 // Create the macro instantiation object and add to the current macro
2018 // instantiation stack.
2019 MacroInstantiation *MI = new MacroInstantiation(
2020 M, NameLoc, CurBuffer, getTok().getLoc(), Instantiation);
2021 ActiveMacros.push_back(MI);
2023 // Jump to the macro instantiation and prime the lexer.
2024 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
2025 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
2031 void AsmParser::handleMacroExit() {
2032 // Jump to the EndOfStatement we should return to, and consume it.
2033 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2036 // Pop the instantiation entry.
2037 delete ActiveMacros.back();
2038 ActiveMacros.pop_back();
2041 static bool isUsedIn(const MCSymbol *Sym, const MCExpr *Value) {
2042 switch (Value->getKind()) {
2043 case MCExpr::Binary: {
2044 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
2045 return isUsedIn(Sym, BE->getLHS()) || isUsedIn(Sym, BE->getRHS());
2047 case MCExpr::Target:
2048 case MCExpr::Constant:
2050 case MCExpr::SymbolRef: {
2052 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
2054 return isUsedIn(Sym, S.getVariableValue());
2058 return isUsedIn(Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
2061 llvm_unreachable("Unknown expr kind!");
2064 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
2066 // FIXME: Use better location, we should use proper tokens.
2067 SMLoc EqualLoc = Lexer.getLoc();
2069 const MCExpr *Value;
2070 if (parseExpression(Value))
2073 // Note: we don't count b as used in "a = b". This is to allow
2077 if (Lexer.isNot(AsmToken::EndOfStatement))
2078 return TokError("unexpected token in assignment");
2080 // Error on assignment to '.'.
2082 return Error(EqualLoc, ("assignment to pseudo-symbol '.' is unsupported "
2083 "(use '.space' or '.org').)"));
2086 // Eat the end of statement marker.
2089 // Validate that the LHS is allowed to be a variable (either it has not been
2090 // used as a symbol, or it is an absolute symbol).
2091 MCSymbol *Sym = getContext().LookupSymbol(Name);
2093 // Diagnose assignment to a label.
2095 // FIXME: Diagnostics. Note the location of the definition as a label.
2096 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
2097 if (isUsedIn(Sym, Value))
2098 return Error(EqualLoc, "Recursive use of '" + Name + "'");
2099 else if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable())
2100 ; // Allow redefinitions of undefined symbols only used in directives.
2101 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
2102 ; // Allow redefinitions of variables that haven't yet been used.
2103 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
2104 return Error(EqualLoc, "redefinition of '" + Name + "'");
2105 else if (!Sym->isVariable())
2106 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
2107 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
2108 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
2111 // Don't count these checks as uses.
2112 Sym->setUsed(false);
2114 Sym = getContext().GetOrCreateSymbol(Name);
2116 // FIXME: Handle '.'.
2118 // Do the assignment.
2119 Out.EmitAssignment(Sym, Value);
2121 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2126 /// parseIdentifier:
2129 bool AsmParser::parseIdentifier(StringRef &Res) {
2130 // The assembler has relaxed rules for accepting identifiers, in particular we
2131 // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2132 // separate tokens. At this level, we have already lexed so we cannot (currently)
2133 // handle this as a context dependent token, instead we detect adjacent tokens
2134 // and return the combined identifier.
2135 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2136 SMLoc PrefixLoc = getLexer().getLoc();
2138 // Consume the prefix character, and check for a following identifier.
2140 if (Lexer.isNot(AsmToken::Identifier))
2143 // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
2144 if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer())
2147 // Construct the joined identifier and consume the token.
2149 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
2154 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
2157 Res = getTok().getIdentifier();
2159 Lex(); // Consume the identifier token.
2164 /// parseDirectiveSet:
2165 /// ::= .equ identifier ',' expression
2166 /// ::= .equiv identifier ',' expression
2167 /// ::= .set identifier ',' expression
2168 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
2171 if (parseIdentifier(Name))
2172 return TokError("expected identifier after '" + Twine(IDVal) + "'");
2174 if (getLexer().isNot(AsmToken::Comma))
2175 return TokError("unexpected token in '" + Twine(IDVal) + "'");
2178 return parseAssignment(Name, allow_redef, true);
2181 bool AsmParser::parseEscapedString(std::string &Data) {
2182 assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
2185 StringRef Str = getTok().getStringContents();
2186 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2187 if (Str[i] != '\\') {
2192 // Recognize escaped characters. Note that this escape semantics currently
2193 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2196 return TokError("unexpected backslash at end of string");
2198 // Recognize octal sequences.
2199 if ((unsigned)(Str[i] - '0') <= 7) {
2200 // Consume up to three octal characters.
2201 unsigned Value = Str[i] - '0';
2203 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2205 Value = Value * 8 + (Str[i] - '0');
2207 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2209 Value = Value * 8 + (Str[i] - '0');
2214 return TokError("invalid octal escape sequence (out of range)");
2216 Data += (unsigned char)Value;
2220 // Otherwise recognize individual escapes.
2223 // Just reject invalid escape sequences for now.
2224 return TokError("invalid escape sequence (unrecognized character)");
2226 case 'b': Data += '\b'; break;
2227 case 'f': Data += '\f'; break;
2228 case 'n': Data += '\n'; break;
2229 case 'r': Data += '\r'; break;
2230 case 't': Data += '\t'; break;
2231 case '"': Data += '"'; break;
2232 case '\\': Data += '\\'; break;
2239 /// parseDirectiveAscii:
2240 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2241 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2242 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2243 checkForValidSection();
2246 if (getLexer().isNot(AsmToken::String))
2247 return TokError("expected string in '" + Twine(IDVal) + "' directive");
2250 if (parseEscapedString(Data))
2253 getStreamer().EmitBytes(Data);
2255 getStreamer().EmitBytes(StringRef("\0", 1));
2259 if (getLexer().is(AsmToken::EndOfStatement))
2262 if (getLexer().isNot(AsmToken::Comma))
2263 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
2272 /// parseDirectiveValue
2273 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
2274 bool AsmParser::parseDirectiveValue(unsigned Size) {
2275 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2276 checkForValidSection();
2279 const MCExpr *Value;
2280 SMLoc ExprLoc = getLexer().getLoc();
2281 if (parseExpression(Value))
2284 // Special case constant expressions to match code generator.
2285 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2286 assert(Size <= 8 && "Invalid size");
2287 uint64_t IntValue = MCE->getValue();
2288 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
2289 return Error(ExprLoc, "literal value out of range for directive");
2290 getStreamer().EmitIntValue(IntValue, Size);
2292 getStreamer().EmitValue(Value, Size);
2294 if (getLexer().is(AsmToken::EndOfStatement))
2297 // FIXME: Improve diagnostic.
2298 if (getLexer().isNot(AsmToken::Comma))
2299 return TokError("unexpected token in directive");
2308 /// parseDirectiveRealValue
2309 /// ::= (.single | .double) [ expression (, expression)* ]
2310 bool AsmParser::parseDirectiveRealValue(const fltSemantics &Semantics) {
2311 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2312 checkForValidSection();
2315 // We don't truly support arithmetic on floating point expressions, so we
2316 // have to manually parse unary prefixes.
2318 if (getLexer().is(AsmToken::Minus)) {
2321 } else if (getLexer().is(AsmToken::Plus))
2324 if (getLexer().isNot(AsmToken::Integer) &&
2325 getLexer().isNot(AsmToken::Real) &&
2326 getLexer().isNot(AsmToken::Identifier))
2327 return TokError("unexpected token in directive");
2329 // Convert to an APFloat.
2330 APFloat Value(Semantics);
2331 StringRef IDVal = getTok().getString();
2332 if (getLexer().is(AsmToken::Identifier)) {
2333 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
2334 Value = APFloat::getInf(Semantics);
2335 else if (!IDVal.compare_lower("nan"))
2336 Value = APFloat::getNaN(Semantics, false, ~0);
2338 return TokError("invalid floating point literal");
2339 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
2340 APFloat::opInvalidOp)
2341 return TokError("invalid floating point literal");
2345 // Consume the numeric token.
2348 // Emit the value as an integer.
2349 APInt AsInt = Value.bitcastToAPInt();
2350 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
2351 AsInt.getBitWidth() / 8);
2353 if (getLexer().is(AsmToken::EndOfStatement))
2356 if (getLexer().isNot(AsmToken::Comma))
2357 return TokError("unexpected token in directive");
2366 /// parseDirectiveZero
2367 /// ::= .zero expression
2368 bool AsmParser::parseDirectiveZero() {
2369 checkForValidSection();
2372 if (parseAbsoluteExpression(NumBytes))
2376 if (getLexer().is(AsmToken::Comma)) {
2378 if (parseAbsoluteExpression(Val))
2382 if (getLexer().isNot(AsmToken::EndOfStatement))
2383 return TokError("unexpected token in '.zero' directive");
2387 getStreamer().EmitFill(NumBytes, Val);
2392 /// parseDirectiveFill
2393 /// ::= .fill expression [ , expression [ , expression ] ]
2394 bool AsmParser::parseDirectiveFill() {
2395 checkForValidSection();
2398 if (parseAbsoluteExpression(NumValues))
2401 int64_t FillSize = 1;
2402 int64_t FillExpr = 0;
2404 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2405 if (getLexer().isNot(AsmToken::Comma))
2406 return TokError("unexpected token in '.fill' directive");
2409 if (parseAbsoluteExpression(FillSize))
2412 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2413 if (getLexer().isNot(AsmToken::Comma))
2414 return TokError("unexpected token in '.fill' directive");
2417 if (parseAbsoluteExpression(FillExpr))
2420 if (getLexer().isNot(AsmToken::EndOfStatement))
2421 return TokError("unexpected token in '.fill' directive");
2427 if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8)
2428 return TokError("invalid '.fill' size, expected 1, 2, 4, or 8");
2430 for (uint64_t i = 0, e = NumValues; i != e; ++i)
2431 getStreamer().EmitIntValue(FillExpr, FillSize);
2436 /// parseDirectiveOrg
2437 /// ::= .org expression [ , expression ]
2438 bool AsmParser::parseDirectiveOrg() {
2439 checkForValidSection();
2441 const MCExpr *Offset;
2442 SMLoc Loc = getTok().getLoc();
2443 if (parseExpression(Offset))
2446 // Parse optional fill expression.
2447 int64_t FillExpr = 0;
2448 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2449 if (getLexer().isNot(AsmToken::Comma))
2450 return TokError("unexpected token in '.org' directive");
2453 if (parseAbsoluteExpression(FillExpr))
2456 if (getLexer().isNot(AsmToken::EndOfStatement))
2457 return TokError("unexpected token in '.org' directive");
2462 // Only limited forms of relocatable expressions are accepted here, it
2463 // has to be relative to the current section. The streamer will return
2464 // 'true' if the expression wasn't evaluatable.
2465 if (getStreamer().EmitValueToOffset(Offset, FillExpr))
2466 return Error(Loc, "expected assembly-time absolute expression");
2471 /// parseDirectiveAlign
2472 /// ::= {.align, ...} expression [ , expression [ , expression ]]
2473 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
2474 checkForValidSection();
2476 SMLoc AlignmentLoc = getLexer().getLoc();
2478 if (parseAbsoluteExpression(Alignment))
2482 bool HasFillExpr = false;
2483 int64_t FillExpr = 0;
2484 int64_t MaxBytesToFill = 0;
2485 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2486 if (getLexer().isNot(AsmToken::Comma))
2487 return TokError("unexpected token in directive");
2490 // The fill expression can be omitted while specifying a maximum number of
2491 // alignment bytes, e.g:
2493 if (getLexer().isNot(AsmToken::Comma)) {
2495 if (parseAbsoluteExpression(FillExpr))
2499 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2500 if (getLexer().isNot(AsmToken::Comma))
2501 return TokError("unexpected token in directive");
2504 MaxBytesLoc = getLexer().getLoc();
2505 if (parseAbsoluteExpression(MaxBytesToFill))
2508 if (getLexer().isNot(AsmToken::EndOfStatement))
2509 return TokError("unexpected token in directive");
2518 // Compute alignment in bytes.
2520 // FIXME: Diagnose overflow.
2521 if (Alignment >= 32) {
2522 Error(AlignmentLoc, "invalid alignment value");
2526 Alignment = 1ULL << Alignment;
2528 // Reject alignments that aren't a power of two, for gas compatibility.
2529 if (!isPowerOf2_64(Alignment))
2530 Error(AlignmentLoc, "alignment must be a power of 2");
2533 // Diagnose non-sensical max bytes to align.
2534 if (MaxBytesLoc.isValid()) {
2535 if (MaxBytesToFill < 1) {
2536 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
2537 "many bytes, ignoring maximum bytes expression");
2541 if (MaxBytesToFill >= Alignment) {
2542 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
2548 // Check whether we should use optimal code alignment for this .align
2550 bool UseCodeAlign = getStreamer().getCurrentSection().first->UseCodeAlign();
2551 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
2552 ValueSize == 1 && UseCodeAlign) {
2553 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
2555 // FIXME: Target specific behavior about how the "extra" bytes are filled.
2556 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
2563 /// parseDirectiveFile
2564 /// ::= .file [number] filename
2565 /// ::= .file number directory filename
2566 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
2567 // FIXME: I'm not sure what this is.
2568 int64_t FileNumber = -1;
2569 SMLoc FileNumberLoc = getLexer().getLoc();
2570 if (getLexer().is(AsmToken::Integer)) {
2571 FileNumber = getTok().getIntVal();
2575 return TokError("file number less than one");
2578 if (getLexer().isNot(AsmToken::String))
2579 return TokError("unexpected token in '.file' directive");
2581 // Usually the directory and filename together, otherwise just the directory.
2582 // Allow the strings to have escaped octal character sequence.
2583 std::string Path = getTok().getString();
2584 if (parseEscapedString(Path))
2588 StringRef Directory;
2590 std::string FilenameData;
2591 if (getLexer().is(AsmToken::String)) {
2592 if (FileNumber == -1)
2593 return TokError("explicit path specified, but no file number");
2594 if (parseEscapedString(FilenameData))
2596 Filename = FilenameData;
2603 if (getLexer().isNot(AsmToken::EndOfStatement))
2604 return TokError("unexpected token in '.file' directive");
2606 if (FileNumber == -1)
2607 getStreamer().EmitFileDirective(Filename);
2609 if (getContext().getGenDwarfForAssembly() == true)
2611 "input can't have .file dwarf directives when -g is "
2612 "used to generate dwarf debug info for assembly code");
2614 if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename))
2615 Error(FileNumberLoc, "file number already allocated");
2621 /// parseDirectiveLine
2622 /// ::= .line [number]
2623 bool AsmParser::parseDirectiveLine() {
2624 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2625 if (getLexer().isNot(AsmToken::Integer))
2626 return TokError("unexpected token in '.line' directive");
2628 int64_t LineNumber = getTok().getIntVal();
2632 // FIXME: Do something with the .line.
2635 if (getLexer().isNot(AsmToken::EndOfStatement))
2636 return TokError("unexpected token in '.line' directive");
2641 /// parseDirectiveLoc
2642 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
2643 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
2644 /// The first number is a file number, must have been previously assigned with
2645 /// a .file directive, the second number is the line number and optionally the
2646 /// third number is a column position (zero if not specified). The remaining
2647 /// optional items are .loc sub-directives.
2648 bool AsmParser::parseDirectiveLoc() {
2649 if (getLexer().isNot(AsmToken::Integer))
2650 return TokError("unexpected token in '.loc' directive");
2651 int64_t FileNumber = getTok().getIntVal();
2653 return TokError("file number less than one in '.loc' directive");
2654 if (!getContext().isValidDwarfFileNumber(FileNumber))
2655 return TokError("unassigned file number in '.loc' directive");
2658 int64_t LineNumber = 0;
2659 if (getLexer().is(AsmToken::Integer)) {
2660 LineNumber = getTok().getIntVal();
2662 return TokError("line number less than zero in '.loc' directive");
2666 int64_t ColumnPos = 0;
2667 if (getLexer().is(AsmToken::Integer)) {
2668 ColumnPos = getTok().getIntVal();
2670 return TokError("column position less than zero in '.loc' directive");
2674 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
2676 int64_t Discriminator = 0;
2677 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2679 if (getLexer().is(AsmToken::EndOfStatement))
2683 SMLoc Loc = getTok().getLoc();
2684 if (parseIdentifier(Name))
2685 return TokError("unexpected token in '.loc' directive");
2687 if (Name == "basic_block")
2688 Flags |= DWARF2_FLAG_BASIC_BLOCK;
2689 else if (Name == "prologue_end")
2690 Flags |= DWARF2_FLAG_PROLOGUE_END;
2691 else if (Name == "epilogue_begin")
2692 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
2693 else if (Name == "is_stmt") {
2694 Loc = getTok().getLoc();
2695 const MCExpr *Value;
2696 if (parseExpression(Value))
2698 // The expression must be the constant 0 or 1.
2699 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2700 int Value = MCE->getValue();
2702 Flags &= ~DWARF2_FLAG_IS_STMT;
2703 else if (Value == 1)
2704 Flags |= DWARF2_FLAG_IS_STMT;
2706 return Error(Loc, "is_stmt value not 0 or 1");
2708 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
2710 } else if (Name == "isa") {
2711 Loc = getTok().getLoc();
2712 const MCExpr *Value;
2713 if (parseExpression(Value))
2715 // The expression must be a constant greater or equal to 0.
2716 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2717 int Value = MCE->getValue();
2719 return Error(Loc, "isa number less than zero");
2722 return Error(Loc, "isa number not a constant value");
2724 } else if (Name == "discriminator") {
2725 if (parseAbsoluteExpression(Discriminator))
2728 return Error(Loc, "unknown sub-directive in '.loc' directive");
2731 if (getLexer().is(AsmToken::EndOfStatement))
2736 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
2737 Isa, Discriminator, StringRef());
2742 /// parseDirectiveStabs
2743 /// ::= .stabs string, number, number, number
2744 bool AsmParser::parseDirectiveStabs() {
2745 return TokError("unsupported directive '.stabs'");
2748 /// parseDirectiveCFISections
2749 /// ::= .cfi_sections section [, section]
2750 bool AsmParser::parseDirectiveCFISections() {
2755 if (parseIdentifier(Name))
2756 return TokError("Expected an identifier");
2758 if (Name == ".eh_frame")
2760 else if (Name == ".debug_frame")
2763 if (getLexer().is(AsmToken::Comma)) {
2766 if (parseIdentifier(Name))
2767 return TokError("Expected an identifier");
2769 if (Name == ".eh_frame")
2771 else if (Name == ".debug_frame")
2775 getStreamer().EmitCFISections(EH, Debug);
2779 /// parseDirectiveCFIStartProc
2780 /// ::= .cfi_startproc
2781 bool AsmParser::parseDirectiveCFIStartProc() {
2782 getStreamer().EmitCFIStartProc();
2786 /// parseDirectiveCFIEndProc
2787 /// ::= .cfi_endproc
2788 bool AsmParser::parseDirectiveCFIEndProc() {
2789 getStreamer().EmitCFIEndProc();
2793 /// \brief parse register name or number.
2794 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
2795 SMLoc DirectiveLoc) {
2798 if (getLexer().isNot(AsmToken::Integer)) {
2799 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
2801 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
2803 return parseAbsoluteExpression(Register);
2808 /// parseDirectiveCFIDefCfa
2809 /// ::= .cfi_def_cfa register, offset
2810 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
2811 int64_t Register = 0;
2812 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2815 if (getLexer().isNot(AsmToken::Comma))
2816 return TokError("unexpected token in directive");
2820 if (parseAbsoluteExpression(Offset))
2823 getStreamer().EmitCFIDefCfa(Register, Offset);
2827 /// parseDirectiveCFIDefCfaOffset
2828 /// ::= .cfi_def_cfa_offset offset
2829 bool AsmParser::parseDirectiveCFIDefCfaOffset() {
2831 if (parseAbsoluteExpression(Offset))
2834 getStreamer().EmitCFIDefCfaOffset(Offset);
2838 /// parseDirectiveCFIRegister
2839 /// ::= .cfi_register register, register
2840 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
2841 int64_t Register1 = 0;
2842 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc))
2845 if (getLexer().isNot(AsmToken::Comma))
2846 return TokError("unexpected token in directive");
2849 int64_t Register2 = 0;
2850 if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc))
2853 getStreamer().EmitCFIRegister(Register1, Register2);
2857 /// parseDirectiveCFIWindowSave
2858 /// ::= .cfi_window_save
2859 bool AsmParser::parseDirectiveCFIWindowSave() {
2860 getStreamer().EmitCFIWindowSave();
2864 /// parseDirectiveCFIAdjustCfaOffset
2865 /// ::= .cfi_adjust_cfa_offset adjustment
2866 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
2867 int64_t Adjustment = 0;
2868 if (parseAbsoluteExpression(Adjustment))
2871 getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
2875 /// parseDirectiveCFIDefCfaRegister
2876 /// ::= .cfi_def_cfa_register register
2877 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
2878 int64_t Register = 0;
2879 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2882 getStreamer().EmitCFIDefCfaRegister(Register);
2886 /// parseDirectiveCFIOffset
2887 /// ::= .cfi_offset register, offset
2888 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
2889 int64_t Register = 0;
2892 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2895 if (getLexer().isNot(AsmToken::Comma))
2896 return TokError("unexpected token in directive");
2899 if (parseAbsoluteExpression(Offset))
2902 getStreamer().EmitCFIOffset(Register, Offset);
2906 /// parseDirectiveCFIRelOffset
2907 /// ::= .cfi_rel_offset register, offset
2908 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
2909 int64_t Register = 0;
2911 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
2914 if (getLexer().isNot(AsmToken::Comma))
2915 return TokError("unexpected token in directive");
2919 if (parseAbsoluteExpression(Offset))
2922 getStreamer().EmitCFIRelOffset(Register, Offset);
2926 static bool isValidEncoding(int64_t Encoding) {
2927 if (Encoding & ~0xff)
2930 if (Encoding == dwarf::DW_EH_PE_omit)
2933 const unsigned Format = Encoding & 0xf;
2934 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
2935 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
2936 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
2937 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
2940 const unsigned Application = Encoding & 0x70;
2941 if (Application != dwarf::DW_EH_PE_absptr &&
2942 Application != dwarf::DW_EH_PE_pcrel)
2948 /// parseDirectiveCFIPersonalityOrLsda
2949 /// IsPersonality true for cfi_personality, false for cfi_lsda
2950 /// ::= .cfi_personality encoding, [symbol_name]
2951 /// ::= .cfi_lsda encoding, [symbol_name]
2952 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
2953 int64_t Encoding = 0;
2954 if (parseAbsoluteExpression(Encoding))
2956 if (Encoding == dwarf::DW_EH_PE_omit)
2959 if (!isValidEncoding(Encoding))
2960 return TokError("unsupported encoding.");
2962 if (getLexer().isNot(AsmToken::Comma))
2963 return TokError("unexpected token in directive");
2967 if (parseIdentifier(Name))
2968 return TokError("expected identifier in directive");
2970 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
2973 getStreamer().EmitCFIPersonality(Sym, Encoding);
2975 getStreamer().EmitCFILsda(Sym, Encoding);
2979 /// parseDirectiveCFIRememberState
2980 /// ::= .cfi_remember_state
2981 bool AsmParser::parseDirectiveCFIRememberState() {
2982 getStreamer().EmitCFIRememberState();
2986 /// parseDirectiveCFIRestoreState
2987 /// ::= .cfi_remember_state
2988 bool AsmParser::parseDirectiveCFIRestoreState() {
2989 getStreamer().EmitCFIRestoreState();
2993 /// parseDirectiveCFISameValue
2994 /// ::= .cfi_same_value register
2995 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
2996 int64_t Register = 0;
2998 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3001 getStreamer().EmitCFISameValue(Register);
3005 /// parseDirectiveCFIRestore
3006 /// ::= .cfi_restore register
3007 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
3008 int64_t Register = 0;
3009 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3012 getStreamer().EmitCFIRestore(Register);
3016 /// parseDirectiveCFIEscape
3017 /// ::= .cfi_escape expression[,...]
3018 bool AsmParser::parseDirectiveCFIEscape() {
3021 if (parseAbsoluteExpression(CurrValue))
3024 Values.push_back((uint8_t)CurrValue);
3026 while (getLexer().is(AsmToken::Comma)) {
3029 if (parseAbsoluteExpression(CurrValue))
3032 Values.push_back((uint8_t)CurrValue);
3035 getStreamer().EmitCFIEscape(Values);
3039 /// parseDirectiveCFISignalFrame
3040 /// ::= .cfi_signal_frame
3041 bool AsmParser::parseDirectiveCFISignalFrame() {
3042 if (getLexer().isNot(AsmToken::EndOfStatement))
3043 return Error(getLexer().getLoc(),
3044 "unexpected token in '.cfi_signal_frame'");
3046 getStreamer().EmitCFISignalFrame();
3050 /// parseDirectiveCFIUndefined
3051 /// ::= .cfi_undefined register
3052 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
3053 int64_t Register = 0;
3055 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3058 getStreamer().EmitCFIUndefined(Register);
3062 /// parseDirectiveMacrosOnOff
3065 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
3066 if (getLexer().isNot(AsmToken::EndOfStatement))
3067 return Error(getLexer().getLoc(),
3068 "unexpected token in '" + Directive + "' directive");
3070 setMacrosEnabled(Directive == ".macros_on");
3074 /// parseDirectiveMacro
3075 /// ::= .macro name [parameters]
3076 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
3078 if (parseIdentifier(Name))
3079 return TokError("expected identifier in '.macro' directive");
3081 MCAsmMacroParameters Parameters;
3082 // Argument delimiter is initially unknown. It will be set by
3083 // parseMacroArgument()
3084 AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
3085 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3087 MCAsmMacroParameter Parameter;
3088 if (parseIdentifier(Parameter.first))
3089 return TokError("expected identifier in '.macro' directive");
3091 if (getLexer().is(AsmToken::Equal)) {
3093 if (parseMacroArgument(Parameter.second, ArgumentDelimiter))
3097 Parameters.push_back(Parameter);
3099 if (getLexer().is(AsmToken::Comma))
3101 else if (getLexer().is(AsmToken::EndOfStatement))
3106 // Eat the end of statement.
3109 AsmToken EndToken, StartToken = getTok();
3111 // Lex the macro definition.
3113 // Check whether we have reached the end of the file.
3114 if (getLexer().is(AsmToken::Eof))
3115 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
3117 // Otherwise, check whether we have reach the .endmacro.
3118 if (getLexer().is(AsmToken::Identifier) &&
3119 (getTok().getIdentifier() == ".endm" ||
3120 getTok().getIdentifier() == ".endmacro")) {
3121 EndToken = getTok();
3123 if (getLexer().isNot(AsmToken::EndOfStatement))
3124 return TokError("unexpected token in '" + EndToken.getIdentifier() +
3129 // Otherwise, scan til the end of the statement.
3130 eatToEndOfStatement();
3133 if (lookupMacro(Name)) {
3134 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
3137 const char *BodyStart = StartToken.getLoc().getPointer();
3138 const char *BodyEnd = EndToken.getLoc().getPointer();
3139 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3140 checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
3141 defineMacro(Name, MCAsmMacro(Name, Body, Parameters));
3145 /// checkForBadMacro
3147 /// With the support added for named parameters there may be code out there that
3148 /// is transitioning from positional parameters. In versions of gas that did
3149 /// not support named parameters they would be ignored on the macro defintion.
3150 /// But to support both styles of parameters this is not possible so if a macro
3151 /// defintion has named parameters but does not use them and has what appears
3152 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
3153 /// warning that the positional parameter found in body which have no effect.
3154 /// Hoping the developer will either remove the named parameters from the macro
3155 /// definiton so the positional parameters get used if that was what was
3156 /// intended or change the macro to use the named parameters. It is possible
3157 /// this warning will trigger when the none of the named parameters are used
3158 /// and the strings like $1 are infact to simply to be passed trough unchanged.
3159 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
3161 MCAsmMacroParameters Parameters) {
3162 // If this macro is not defined with named parameters the warning we are
3163 // checking for here doesn't apply.
3164 unsigned NParameters = Parameters.size();
3165 if (NParameters == 0)
3168 bool NamedParametersFound = false;
3169 bool PositionalParametersFound = false;
3171 // Look at the body of the macro for use of both the named parameters and what
3172 // are likely to be positional parameters. This is what expandMacro() is
3173 // doing when it finds the parameters in the body.
3174 while (!Body.empty()) {
3175 // Scan for the next possible parameter.
3176 std::size_t End = Body.size(), Pos = 0;
3177 for (; Pos != End; ++Pos) {
3178 // Check for a substitution or escape.
3179 // This macro is defined with parameters, look for \foo, \bar, etc.
3180 if (Body[Pos] == '\\' && Pos + 1 != End)
3183 // This macro should have parameters, but look for $0, $1, ..., $n too.
3184 if (Body[Pos] != '$' || Pos + 1 == End)
3186 char Next = Body[Pos + 1];
3187 if (Next == '$' || Next == 'n' ||
3188 isdigit(static_cast<unsigned char>(Next)))
3192 // Check if we reached the end.
3196 if (Body[Pos] == '$') {
3197 switch (Body[Pos + 1]) {
3202 // $n => number of arguments
3204 PositionalParametersFound = true;
3207 // $[0-9] => argument
3209 PositionalParametersFound = true;
3215 unsigned I = Pos + 1;
3216 while (isIdentifierChar(Body[I]) && I + 1 != End)
3219 const char *Begin = Body.data() + Pos + 1;
3220 StringRef Argument(Begin, I - (Pos + 1));
3222 for (; Index < NParameters; ++Index)
3223 if (Parameters[Index].first == Argument)
3226 if (Index == NParameters) {
3227 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
3233 NamedParametersFound = true;
3234 Pos += 1 + Argument.size();
3237 // Update the scan point.
3238 Body = Body.substr(Pos);
3241 if (!NamedParametersFound && PositionalParametersFound)
3242 Warning(DirectiveLoc, "macro defined with named parameters which are not "
3243 "used in macro body, possible positional parameter "
3244 "found in body which will have no effect");
3247 /// parseDirectiveEndMacro
3250 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
3251 if (getLexer().isNot(AsmToken::EndOfStatement))
3252 return TokError("unexpected token in '" + Directive + "' directive");
3254 // If we are inside a macro instantiation, terminate the current
3256 if (isInsideMacroInstantiation()) {
3261 // Otherwise, this .endmacro is a stray entry in the file; well formed
3262 // .endmacro directives are handled during the macro definition parsing.
3263 return TokError("unexpected '" + Directive + "' in file, "
3264 "no current macro definition");
3267 /// parseDirectivePurgeMacro
3269 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
3271 if (parseIdentifier(Name))
3272 return TokError("expected identifier in '.purgem' directive");
3274 if (getLexer().isNot(AsmToken::EndOfStatement))
3275 return TokError("unexpected token in '.purgem' directive");
3277 if (!lookupMacro(Name))
3278 return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
3280 undefineMacro(Name);
3284 /// parseDirectiveBundleAlignMode
3285 /// ::= {.bundle_align_mode} expression
3286 bool AsmParser::parseDirectiveBundleAlignMode() {
3287 checkForValidSection();
3289 // Expect a single argument: an expression that evaluates to a constant
3290 // in the inclusive range 0-30.
3291 SMLoc ExprLoc = getLexer().getLoc();
3292 int64_t AlignSizePow2;
3293 if (parseAbsoluteExpression(AlignSizePow2))
3295 else if (getLexer().isNot(AsmToken::EndOfStatement))
3296 return TokError("unexpected token after expression in"
3297 " '.bundle_align_mode' directive");
3298 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30)
3299 return Error(ExprLoc,
3300 "invalid bundle alignment size (expected between 0 and 30)");
3304 // Because of AlignSizePow2's verified range we can safely truncate it to
3306 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
3310 /// parseDirectiveBundleLock
3311 /// ::= {.bundle_lock} [align_to_end]
3312 bool AsmParser::parseDirectiveBundleLock() {
3313 checkForValidSection();
3314 bool AlignToEnd = false;
3316 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3318 SMLoc Loc = getTok().getLoc();
3319 const char *kInvalidOptionError =
3320 "invalid option for '.bundle_lock' directive";
3322 if (parseIdentifier(Option))
3323 return Error(Loc, kInvalidOptionError);
3325 if (Option != "align_to_end")
3326 return Error(Loc, kInvalidOptionError);
3327 else if (getLexer().isNot(AsmToken::EndOfStatement))
3329 "unexpected token after '.bundle_lock' directive option");
3335 getStreamer().EmitBundleLock(AlignToEnd);
3339 /// parseDirectiveBundleLock
3340 /// ::= {.bundle_lock}
3341 bool AsmParser::parseDirectiveBundleUnlock() {
3342 checkForValidSection();
3344 if (getLexer().isNot(AsmToken::EndOfStatement))
3345 return TokError("unexpected token in '.bundle_unlock' directive");
3348 getStreamer().EmitBundleUnlock();
3352 /// parseDirectiveSpace
3353 /// ::= (.skip | .space) expression [ , expression ]
3354 bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
3355 checkForValidSection();
3358 if (parseAbsoluteExpression(NumBytes))
3361 int64_t FillExpr = 0;
3362 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3363 if (getLexer().isNot(AsmToken::Comma))
3364 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3367 if (parseAbsoluteExpression(FillExpr))
3370 if (getLexer().isNot(AsmToken::EndOfStatement))
3371 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3377 return TokError("invalid number of bytes in '" + Twine(IDVal) +
3380 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
3381 getStreamer().EmitFill(NumBytes, FillExpr);
3386 /// parseDirectiveLEB128
3387 /// ::= (.sleb128 | .uleb128) expression
3388 bool AsmParser::parseDirectiveLEB128(bool Signed) {
3389 checkForValidSection();
3390 const MCExpr *Value;
3392 if (parseExpression(Value))
3395 if (getLexer().isNot(AsmToken::EndOfStatement))
3396 return TokError("unexpected token in directive");
3399 getStreamer().EmitSLEB128Value(Value);
3401 getStreamer().EmitULEB128Value(Value);
3406 /// parseDirectiveSymbolAttribute
3407 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
3408 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
3409 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3412 SMLoc Loc = getTok().getLoc();
3414 if (parseIdentifier(Name))
3415 return Error(Loc, "expected identifier in directive");
3417 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3419 // Assembler local symbols don't make any sense here. Complain loudly.
3420 if (Sym->isTemporary())
3421 return Error(Loc, "non-local symbol required in directive");
3423 if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
3424 return Error(Loc, "unable to emit symbol attribute");
3426 if (getLexer().is(AsmToken::EndOfStatement))
3429 if (getLexer().isNot(AsmToken::Comma))
3430 return TokError("unexpected token in directive");
3439 /// parseDirectiveComm
3440 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
3441 bool AsmParser::parseDirectiveComm(bool IsLocal) {
3442 checkForValidSection();
3444 SMLoc IDLoc = getLexer().getLoc();
3446 if (parseIdentifier(Name))
3447 return TokError("expected identifier in directive");
3449 // Handle the identifier as the key symbol.
3450 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3452 if (getLexer().isNot(AsmToken::Comma))
3453 return TokError("unexpected token in directive");
3457 SMLoc SizeLoc = getLexer().getLoc();
3458 if (parseAbsoluteExpression(Size))
3461 int64_t Pow2Alignment = 0;
3462 SMLoc Pow2AlignmentLoc;
3463 if (getLexer().is(AsmToken::Comma)) {
3465 Pow2AlignmentLoc = getLexer().getLoc();
3466 if (parseAbsoluteExpression(Pow2Alignment))
3469 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
3470 if (IsLocal && LCOMM == LCOMM::NoAlignment)
3471 return Error(Pow2AlignmentLoc, "alignment not supported on this target");
3473 // If this target takes alignments in bytes (not log) validate and convert.
3474 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
3475 (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
3476 if (!isPowerOf2_64(Pow2Alignment))
3477 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
3478 Pow2Alignment = Log2_64(Pow2Alignment);
3482 if (getLexer().isNot(AsmToken::EndOfStatement))
3483 return TokError("unexpected token in '.comm' or '.lcomm' directive");
3487 // NOTE: a size of zero for a .comm should create a undefined symbol
3488 // but a size of .lcomm creates a bss symbol of size zero.
3490 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
3491 "be less than zero");
3493 // NOTE: The alignment in the directive is a power of 2 value, the assembler
3494 // may internally end up wanting an alignment in bytes.
3495 // FIXME: Diagnose overflow.
3496 if (Pow2Alignment < 0)
3497 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
3498 "alignment, can't be less than zero");
3500 if (!Sym->isUndefined())
3501 return Error(IDLoc, "invalid symbol redefinition");
3503 // Create the Symbol as a common or local common with Size and Pow2Alignment
3505 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3509 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3513 /// parseDirectiveAbort
3514 /// ::= .abort [... message ...]
3515 bool AsmParser::parseDirectiveAbort() {
3516 // FIXME: Use loc from directive.
3517 SMLoc Loc = getLexer().getLoc();
3519 StringRef Str = parseStringToEndOfStatement();
3520 if (getLexer().isNot(AsmToken::EndOfStatement))
3521 return TokError("unexpected token in '.abort' directive");
3526 Error(Loc, ".abort detected. Assembly stopping.");
3528 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
3529 // FIXME: Actually abort assembly here.
3534 /// parseDirectiveInclude
3535 /// ::= .include "filename"
3536 bool AsmParser::parseDirectiveInclude() {
3537 if (getLexer().isNot(AsmToken::String))
3538 return TokError("expected string in '.include' directive");
3540 // Allow the strings to have escaped octal character sequence.
3541 std::string Filename;
3542 if (parseEscapedString(Filename))
3544 SMLoc IncludeLoc = getLexer().getLoc();
3547 if (getLexer().isNot(AsmToken::EndOfStatement))
3548 return TokError("unexpected token in '.include' directive");
3550 // Attempt to switch the lexer to the included file before consuming the end
3551 // of statement to avoid losing it when we switch.
3552 if (enterIncludeFile(Filename)) {
3553 Error(IncludeLoc, "Could not find include file '" + Filename + "'");
3560 /// parseDirectiveIncbin
3561 /// ::= .incbin "filename"
3562 bool AsmParser::parseDirectiveIncbin() {
3563 if (getLexer().isNot(AsmToken::String))
3564 return TokError("expected string in '.incbin' directive");
3566 // Allow the strings to have escaped octal character sequence.
3567 std::string Filename;
3568 if (parseEscapedString(Filename))
3570 SMLoc IncbinLoc = getLexer().getLoc();
3573 if (getLexer().isNot(AsmToken::EndOfStatement))
3574 return TokError("unexpected token in '.incbin' directive");
3576 // Attempt to process the included file.
3577 if (processIncbinFile(Filename)) {
3578 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
3585 /// parseDirectiveIf
3586 /// ::= .if expression
3587 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc) {
3588 TheCondStack.push_back(TheCondState);
3589 TheCondState.TheCond = AsmCond::IfCond;
3590 if (TheCondState.Ignore) {
3591 eatToEndOfStatement();
3594 if (parseAbsoluteExpression(ExprValue))
3597 if (getLexer().isNot(AsmToken::EndOfStatement))
3598 return TokError("unexpected token in '.if' directive");
3602 TheCondState.CondMet = ExprValue;
3603 TheCondState.Ignore = !TheCondState.CondMet;
3609 /// parseDirectiveIfb
3611 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
3612 TheCondStack.push_back(TheCondState);
3613 TheCondState.TheCond = AsmCond::IfCond;
3615 if (TheCondState.Ignore) {
3616 eatToEndOfStatement();
3618 StringRef Str = parseStringToEndOfStatement();
3620 if (getLexer().isNot(AsmToken::EndOfStatement))
3621 return TokError("unexpected token in '.ifb' directive");
3625 TheCondState.CondMet = ExpectBlank == Str.empty();
3626 TheCondState.Ignore = !TheCondState.CondMet;
3632 /// parseDirectiveIfc
3633 /// ::= .ifc string1, string2
3634 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
3635 TheCondStack.push_back(TheCondState);
3636 TheCondState.TheCond = AsmCond::IfCond;
3638 if (TheCondState.Ignore) {
3639 eatToEndOfStatement();
3641 StringRef Str1 = parseStringToComma();
3643 if (getLexer().isNot(AsmToken::Comma))
3644 return TokError("unexpected token in '.ifc' directive");
3648 StringRef Str2 = parseStringToEndOfStatement();
3650 if (getLexer().isNot(AsmToken::EndOfStatement))
3651 return TokError("unexpected token in '.ifc' directive");
3655 TheCondState.CondMet = ExpectEqual == (Str1 == Str2);
3656 TheCondState.Ignore = !TheCondState.CondMet;
3662 /// parseDirectiveIfdef
3663 /// ::= .ifdef symbol
3664 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
3666 TheCondStack.push_back(TheCondState);
3667 TheCondState.TheCond = AsmCond::IfCond;
3669 if (TheCondState.Ignore) {
3670 eatToEndOfStatement();
3672 if (parseIdentifier(Name))
3673 return TokError("expected identifier after '.ifdef'");
3677 MCSymbol *Sym = getContext().LookupSymbol(Name);
3680 TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined());
3682 TheCondState.CondMet = (Sym == NULL || Sym->isUndefined());
3683 TheCondState.Ignore = !TheCondState.CondMet;
3689 /// parseDirectiveElseIf
3690 /// ::= .elseif expression
3691 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
3692 if (TheCondState.TheCond != AsmCond::IfCond &&
3693 TheCondState.TheCond != AsmCond::ElseIfCond)
3694 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
3696 TheCondState.TheCond = AsmCond::ElseIfCond;
3698 bool LastIgnoreState = false;
3699 if (!TheCondStack.empty())
3700 LastIgnoreState = TheCondStack.back().Ignore;
3701 if (LastIgnoreState || TheCondState.CondMet) {
3702 TheCondState.Ignore = true;
3703 eatToEndOfStatement();
3706 if (parseAbsoluteExpression(ExprValue))
3709 if (getLexer().isNot(AsmToken::EndOfStatement))
3710 return TokError("unexpected token in '.elseif' directive");
3713 TheCondState.CondMet = ExprValue;
3714 TheCondState.Ignore = !TheCondState.CondMet;
3720 /// parseDirectiveElse
3722 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
3723 if (getLexer().isNot(AsmToken::EndOfStatement))
3724 return TokError("unexpected token in '.else' directive");
3728 if (TheCondState.TheCond != AsmCond::IfCond &&
3729 TheCondState.TheCond != AsmCond::ElseIfCond)
3730 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
3732 TheCondState.TheCond = AsmCond::ElseCond;
3733 bool LastIgnoreState = false;
3734 if (!TheCondStack.empty())
3735 LastIgnoreState = TheCondStack.back().Ignore;
3736 if (LastIgnoreState || TheCondState.CondMet)
3737 TheCondState.Ignore = true;
3739 TheCondState.Ignore = false;
3744 /// parseDirectiveEndIf
3746 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
3747 if (getLexer().isNot(AsmToken::EndOfStatement))
3748 return TokError("unexpected token in '.endif' directive");
3752 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
3753 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
3755 if (!TheCondStack.empty()) {
3756 TheCondState = TheCondStack.back();
3757 TheCondStack.pop_back();
3763 void AsmParser::initializeDirectiveKindMap() {
3764 DirectiveKindMap[".set"] = DK_SET;
3765 DirectiveKindMap[".equ"] = DK_EQU;
3766 DirectiveKindMap[".equiv"] = DK_EQUIV;
3767 DirectiveKindMap[".ascii"] = DK_ASCII;
3768 DirectiveKindMap[".asciz"] = DK_ASCIZ;
3769 DirectiveKindMap[".string"] = DK_STRING;
3770 DirectiveKindMap[".byte"] = DK_BYTE;
3771 DirectiveKindMap[".short"] = DK_SHORT;
3772 DirectiveKindMap[".value"] = DK_VALUE;
3773 DirectiveKindMap[".2byte"] = DK_2BYTE;
3774 DirectiveKindMap[".long"] = DK_LONG;
3775 DirectiveKindMap[".int"] = DK_INT;
3776 DirectiveKindMap[".4byte"] = DK_4BYTE;
3777 DirectiveKindMap[".quad"] = DK_QUAD;
3778 DirectiveKindMap[".8byte"] = DK_8BYTE;
3779 DirectiveKindMap[".single"] = DK_SINGLE;
3780 DirectiveKindMap[".float"] = DK_FLOAT;
3781 DirectiveKindMap[".double"] = DK_DOUBLE;
3782 DirectiveKindMap[".align"] = DK_ALIGN;
3783 DirectiveKindMap[".align32"] = DK_ALIGN32;
3784 DirectiveKindMap[".balign"] = DK_BALIGN;
3785 DirectiveKindMap[".balignw"] = DK_BALIGNW;
3786 DirectiveKindMap[".balignl"] = DK_BALIGNL;
3787 DirectiveKindMap[".p2align"] = DK_P2ALIGN;
3788 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
3789 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
3790 DirectiveKindMap[".org"] = DK_ORG;
3791 DirectiveKindMap[".fill"] = DK_FILL;
3792 DirectiveKindMap[".zero"] = DK_ZERO;
3793 DirectiveKindMap[".extern"] = DK_EXTERN;
3794 DirectiveKindMap[".globl"] = DK_GLOBL;
3795 DirectiveKindMap[".global"] = DK_GLOBAL;
3796 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
3797 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
3798 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
3799 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
3800 DirectiveKindMap[".reference"] = DK_REFERENCE;
3801 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
3802 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
3803 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
3804 DirectiveKindMap[".comm"] = DK_COMM;
3805 DirectiveKindMap[".common"] = DK_COMMON;
3806 DirectiveKindMap[".lcomm"] = DK_LCOMM;
3807 DirectiveKindMap[".abort"] = DK_ABORT;
3808 DirectiveKindMap[".include"] = DK_INCLUDE;
3809 DirectiveKindMap[".incbin"] = DK_INCBIN;
3810 DirectiveKindMap[".code16"] = DK_CODE16;
3811 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
3812 DirectiveKindMap[".rept"] = DK_REPT;
3813 DirectiveKindMap[".irp"] = DK_IRP;
3814 DirectiveKindMap[".irpc"] = DK_IRPC;
3815 DirectiveKindMap[".endr"] = DK_ENDR;
3816 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
3817 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
3818 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
3819 DirectiveKindMap[".if"] = DK_IF;
3820 DirectiveKindMap[".ifb"] = DK_IFB;
3821 DirectiveKindMap[".ifnb"] = DK_IFNB;
3822 DirectiveKindMap[".ifc"] = DK_IFC;
3823 DirectiveKindMap[".ifnc"] = DK_IFNC;
3824 DirectiveKindMap[".ifdef"] = DK_IFDEF;
3825 DirectiveKindMap[".ifndef"] = DK_IFNDEF;
3826 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
3827 DirectiveKindMap[".elseif"] = DK_ELSEIF;
3828 DirectiveKindMap[".else"] = DK_ELSE;
3829 DirectiveKindMap[".endif"] = DK_ENDIF;
3830 DirectiveKindMap[".skip"] = DK_SKIP;
3831 DirectiveKindMap[".space"] = DK_SPACE;
3832 DirectiveKindMap[".file"] = DK_FILE;
3833 DirectiveKindMap[".line"] = DK_LINE;
3834 DirectiveKindMap[".loc"] = DK_LOC;
3835 DirectiveKindMap[".stabs"] = DK_STABS;
3836 DirectiveKindMap[".sleb128"] = DK_SLEB128;
3837 DirectiveKindMap[".uleb128"] = DK_ULEB128;
3838 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
3839 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
3840 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
3841 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
3842 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
3843 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
3844 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
3845 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
3846 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
3847 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
3848 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
3849 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
3850 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
3851 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
3852 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
3853 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
3854 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
3855 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
3856 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
3857 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
3858 DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
3859 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
3860 DirectiveKindMap[".macro"] = DK_MACRO;
3861 DirectiveKindMap[".endm"] = DK_ENDM;
3862 DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
3863 DirectiveKindMap[".purgem"] = DK_PURGEM;
3866 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
3867 AsmToken EndToken, StartToken = getTok();
3869 unsigned NestLevel = 0;
3871 // Check whether we have reached the end of the file.
3872 if (getLexer().is(AsmToken::Eof)) {
3873 Error(DirectiveLoc, "no matching '.endr' in definition");
3877 if (Lexer.is(AsmToken::Identifier) &&
3878 (getTok().getIdentifier() == ".rept")) {
3882 // Otherwise, check whether we have reached the .endr.
3883 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
3884 if (NestLevel == 0) {
3885 EndToken = getTok();
3887 if (Lexer.isNot(AsmToken::EndOfStatement)) {
3888 TokError("unexpected token in '.endr' directive");
3896 // Otherwise, scan till the end of the statement.
3897 eatToEndOfStatement();
3900 const char *BodyStart = StartToken.getLoc().getPointer();
3901 const char *BodyEnd = EndToken.getLoc().getPointer();
3902 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3904 // We Are Anonymous.
3906 MCAsmMacroParameters Parameters;
3907 MacroLikeBodies.push_back(MCAsmMacro(Name, Body, Parameters));
3908 return &MacroLikeBodies.back();
3911 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
3912 raw_svector_ostream &OS) {
3915 MemoryBuffer *Instantiation =
3916 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
3918 // Create the macro instantiation object and add to the current macro
3919 // instantiation stack.
3920 MacroInstantiation *MI = new MacroInstantiation(
3921 M, DirectiveLoc, CurBuffer, getTok().getLoc(), Instantiation);
3922 ActiveMacros.push_back(MI);
3924 // Jump to the macro instantiation and prime the lexer.
3925 CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc());
3926 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer));
3930 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc) {
3932 if (parseAbsoluteExpression(Count))
3933 return TokError("unexpected token in '.rept' directive");
3936 return TokError("Count is negative");
3938 if (Lexer.isNot(AsmToken::EndOfStatement))
3939 return TokError("unexpected token in '.rept' directive");
3941 // Eat the end of statement.
3944 // Lex the rept definition.
3945 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
3949 // Macro instantiation is lexical, unfortunately. We construct a new buffer
3950 // to hold the macro body with substitutions.
3951 SmallString<256> Buf;
3952 MCAsmMacroParameters Parameters;
3953 MCAsmMacroArguments A;
3954 raw_svector_ostream OS(Buf);
3956 if (expandMacro(OS, M->Body, Parameters, A, getTok().getLoc()))
3959 instantiateMacroLikeBody(M, DirectiveLoc, OS);
3964 /// parseDirectiveIrp
3965 /// ::= .irp symbol,values
3966 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
3967 MCAsmMacroParameters Parameters;
3968 MCAsmMacroParameter Parameter;
3970 if (parseIdentifier(Parameter.first))
3971 return TokError("expected identifier in '.irp' directive");
3973 Parameters.push_back(Parameter);
3975 if (Lexer.isNot(AsmToken::Comma))
3976 return TokError("expected comma in '.irp' directive");
3980 MCAsmMacroArguments A;
3981 if (parseMacroArguments(0, A))
3984 // Eat the end of statement.
3987 // Lex the irp definition.
3988 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
3992 // Macro instantiation is lexical, unfortunately. We construct a new buffer
3993 // to hold the macro body with substitutions.
3994 SmallString<256> Buf;
3995 raw_svector_ostream OS(Buf);
3997 for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
3998 MCAsmMacroArguments Args;
4001 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
4005 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4010 /// parseDirectiveIrpc
4011 /// ::= .irpc symbol,values
4012 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
4013 MCAsmMacroParameters Parameters;
4014 MCAsmMacroParameter Parameter;
4016 if (parseIdentifier(Parameter.first))
4017 return TokError("expected identifier in '.irpc' directive");
4019 Parameters.push_back(Parameter);
4021 if (Lexer.isNot(AsmToken::Comma))
4022 return TokError("expected comma in '.irpc' directive");
4026 MCAsmMacroArguments A;
4027 if (parseMacroArguments(0, A))
4030 if (A.size() != 1 || A.front().size() != 1)
4031 return TokError("unexpected token in '.irpc' directive");
4033 // Eat the end of statement.
4036 // Lex the irpc definition.
4037 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4041 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4042 // to hold the macro body with substitutions.
4043 SmallString<256> Buf;
4044 raw_svector_ostream OS(Buf);
4046 StringRef Values = A.front().front().getString();
4047 std::size_t I, End = Values.size();
4048 for (I = 0; I < End; ++I) {
4049 MCAsmMacroArgument Arg;
4050 Arg.push_back(AsmToken(AsmToken::Identifier, Values.slice(I, I + 1)));
4052 MCAsmMacroArguments Args;
4053 Args.push_back(Arg);
4055 if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
4059 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4064 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
4065 if (ActiveMacros.empty())
4066 return TokError("unmatched '.endr' directive");
4068 // The only .repl that should get here are the ones created by
4069 // instantiateMacroLikeBody.
4070 assert(getLexer().is(AsmToken::EndOfStatement));
4076 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
4078 const MCExpr *Value;
4079 SMLoc ExprLoc = getLexer().getLoc();
4080 if (parseExpression(Value))
4082 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4084 return Error(ExprLoc, "unexpected expression in _emit");
4085 uint64_t IntValue = MCE->getValue();
4086 if (!isUIntN(8, IntValue) && !isIntN(8, IntValue))
4087 return Error(ExprLoc, "literal value out of range for directive");
4089 Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, Len));
4093 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
4094 const MCExpr *Value;
4095 SMLoc ExprLoc = getLexer().getLoc();
4096 if (parseExpression(Value))
4098 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4100 return Error(ExprLoc, "unexpected expression in align");
4101 uint64_t IntValue = MCE->getValue();
4102 if (!isPowerOf2_64(IntValue))
4103 return Error(ExprLoc, "literal value not a power of two greater then zero");
4105 Info.AsmRewrites->push_back(
4106 AsmRewrite(AOK_Align, IDLoc, 5, Log2_64(IntValue)));
4110 // We are comparing pointers, but the pointers are relative to a single string.
4111 // Thus, this should always be deterministic.
4112 static int rewritesSort(const AsmRewrite *AsmRewriteA,
4113 const AsmRewrite *AsmRewriteB) {
4114 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
4116 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
4119 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
4120 // rewrite to the same location. Make sure the SizeDirective rewrite is
4121 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
4122 // ensures the sort algorithm is stable.
4123 if (AsmRewritePrecedence[AsmRewriteA->Kind] >
4124 AsmRewritePrecedence[AsmRewriteB->Kind])
4127 if (AsmRewritePrecedence[AsmRewriteA->Kind] <
4128 AsmRewritePrecedence[AsmRewriteB->Kind])
4130 llvm_unreachable("Unstable rewrite sort.");
4133 bool AsmParser::parseMSInlineAsm(
4134 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
4135 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls,
4136 SmallVectorImpl<std::string> &Constraints,
4137 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
4138 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
4139 SmallVector<void *, 4> InputDecls;
4140 SmallVector<void *, 4> OutputDecls;
4141 SmallVector<bool, 4> InputDeclsAddressOf;
4142 SmallVector<bool, 4> OutputDeclsAddressOf;
4143 SmallVector<std::string, 4> InputConstraints;
4144 SmallVector<std::string, 4> OutputConstraints;
4145 SmallVector<unsigned, 4> ClobberRegs;
4147 SmallVector<AsmRewrite, 4> AsmStrRewrites;
4152 // While we have input, parse each statement.
4153 unsigned InputIdx = 0;
4154 unsigned OutputIdx = 0;
4155 while (getLexer().isNot(AsmToken::Eof)) {
4156 ParseStatementInfo Info(&AsmStrRewrites);
4157 if (parseStatement(Info))
4160 if (Info.ParseError)
4163 if (Info.Opcode == ~0U)
4166 const MCInstrDesc &Desc = MII->get(Info.Opcode);
4168 // Build the list of clobbers, outputs and inputs.
4169 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
4170 MCParsedAsmOperand *Operand = Info.ParsedOperands[i];
4173 if (Operand->isImm())
4176 // Register operand.
4177 if (Operand->isReg() && !Operand->needAddressOf()) {
4178 unsigned NumDefs = Desc.getNumDefs();
4180 if (NumDefs && Operand->getMCOperandNum() < NumDefs)
4181 ClobberRegs.push_back(Operand->getReg());
4185 // Expr/Input or Output.
4186 StringRef SymName = Operand->getSymName();
4187 if (SymName.empty())
4190 void *OpDecl = Operand->getOpDecl();
4194 bool isOutput = (i == 1) && Desc.mayStore();
4195 SMLoc Start = SMLoc::getFromPointer(SymName.data());
4198 OutputDecls.push_back(OpDecl);
4199 OutputDeclsAddressOf.push_back(Operand->needAddressOf());
4200 OutputConstraints.push_back('=' + Operand->getConstraint().str());
4201 AsmStrRewrites.push_back(AsmRewrite(AOK_Output, Start, SymName.size()));
4203 InputDecls.push_back(OpDecl);
4204 InputDeclsAddressOf.push_back(Operand->needAddressOf());
4205 InputConstraints.push_back(Operand->getConstraint().str());
4206 AsmStrRewrites.push_back(AsmRewrite(AOK_Input, Start, SymName.size()));
4211 // Set the number of Outputs and Inputs.
4212 NumOutputs = OutputDecls.size();
4213 NumInputs = InputDecls.size();
4215 // Set the unique clobbers.
4216 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
4217 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
4219 Clobbers.assign(ClobberRegs.size(), std::string());
4220 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
4221 raw_string_ostream OS(Clobbers[I]);
4222 IP->printRegName(OS, ClobberRegs[I]);
4225 // Merge the various outputs and inputs. Output are expected first.
4226 if (NumOutputs || NumInputs) {
4227 unsigned NumExprs = NumOutputs + NumInputs;
4228 OpDecls.resize(NumExprs);
4229 Constraints.resize(NumExprs);
4230 for (unsigned i = 0; i < NumOutputs; ++i) {
4231 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
4232 Constraints[i] = OutputConstraints[i];
4234 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
4235 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
4236 Constraints[j] = InputConstraints[i];
4240 // Build the IR assembly string.
4241 std::string AsmStringIR;
4242 raw_string_ostream OS(AsmStringIR);
4243 const char *AsmStart = SrcMgr.getMemoryBuffer(0)->getBufferStart();
4244 const char *AsmEnd = SrcMgr.getMemoryBuffer(0)->getBufferEnd();
4245 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
4246 for (SmallVectorImpl<AsmRewrite>::iterator I = AsmStrRewrites.begin(),
4247 E = AsmStrRewrites.end();
4249 AsmRewriteKind Kind = (*I).Kind;
4250 if (Kind == AOK_Delete)
4253 const char *Loc = (*I).Loc.getPointer();
4254 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!");
4256 // Emit everything up to the immediate/expression.
4257 unsigned Len = Loc - AsmStart;
4259 OS << StringRef(AsmStart, Len);
4261 // Skip the original expression.
4262 if (Kind == AOK_Skip) {
4263 AsmStart = Loc + (*I).Len;
4267 unsigned AdditionalSkip = 0;
4268 // Rewrite expressions in $N notation.
4273 OS << "$$" << (*I).Val;
4279 OS << '$' << InputIdx++;
4282 OS << '$' << OutputIdx++;
4284 case AOK_SizeDirective:
4287 case 8: OS << "byte ptr "; break;
4288 case 16: OS << "word ptr "; break;
4289 case 32: OS << "dword ptr "; break;
4290 case 64: OS << "qword ptr "; break;
4291 case 80: OS << "xword ptr "; break;
4292 case 128: OS << "xmmword ptr "; break;
4293 case 256: OS << "ymmword ptr "; break;
4300 unsigned Val = (*I).Val;
4301 OS << ".align " << Val;
4303 // Skip the original immediate.
4304 assert(Val < 10 && "Expected alignment less then 2^10.");
4305 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
4308 case AOK_DotOperator:
4313 // Skip the original expression.
4314 AsmStart = Loc + (*I).Len + AdditionalSkip;
4317 // Emit the remainder of the asm string.
4318 if (AsmStart != AsmEnd)
4319 OS << StringRef(AsmStart, AsmEnd - AsmStart);
4321 AsmString = OS.str();
4325 /// \brief Create an MCAsmParser instance.
4326 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
4327 MCStreamer &Out, const MCAsmInfo &MAI) {
4328 return new AsmParser(SM, C, Out, MAI);