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/STLExtras.h"
16 #include "llvm/ADT/SmallString.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/MCObjectFileInfo.h"
26 #include "llvm/MC/MCParser/AsmCond.h"
27 #include "llvm/MC/MCParser/AsmLexer.h"
28 #include "llvm/MC/MCParser/MCAsmParser.h"
29 #include "llvm/MC/MCParser/MCAsmParserUtils.h"
30 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
31 #include "llvm/MC/MCRegisterInfo.h"
32 #include "llvm/MC/MCSectionMachO.h"
33 #include "llvm/MC/MCStreamer.h"
34 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/MC/MCTargetAsmParser.h"
36 #include "llvm/Support/CommandLine.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/MathExtras.h"
39 #include "llvm/Support/MemoryBuffer.h"
40 #include "llvm/Support/SourceMgr.h"
41 #include "llvm/Support/raw_ostream.h"
49 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {}
52 /// \brief Helper types for tracking macro definitions.
53 typedef std::vector<AsmToken> MCAsmMacroArgument;
54 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
56 struct MCAsmMacroParameter {
58 MCAsmMacroArgument Value;
62 MCAsmMacroParameter() : Required(false), Vararg(false) {}
65 typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters;
70 MCAsmMacroParameters Parameters;
73 MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P)
74 : Name(N), Body(B), Parameters(std::move(P)) {}
77 /// \brief Helper class for storing information about an active macro
79 struct MacroInstantiation {
80 /// The location of the instantiation.
81 SMLoc InstantiationLoc;
83 /// The buffer where parsing should resume upon instantiation completion.
86 /// The location where parsing should resume upon instantiation completion.
89 /// The depth of TheCondStack at the start of the instantiation.
90 size_t CondStackDepth;
93 MacroInstantiation(SMLoc IL, int EB, SMLoc EL, size_t CondStackDepth);
96 struct ParseStatementInfo {
97 /// \brief The parsed operands from the last parsed statement.
98 SmallVector<std::unique_ptr<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(nullptr) {}
109 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
110 : Opcode(~0), ParseError(false), AsmRewrites(rewrites) {}
113 /// \brief The concrete assembly parser instance.
114 class AsmParser : public MCAsmParser {
115 AsmParser(const AsmParser &) = delete;
116 void operator=(const AsmParser &) = delete;
121 const MCAsmInfo &MAI;
123 SourceMgr::DiagHandlerTy SavedDiagHandler;
124 void *SavedDiagContext;
125 std::unique_ptr<MCAsmParserExtension> PlatformParser;
127 /// This is the current buffer index we're lexing from as managed by the
128 /// SourceMgr object.
131 AsmCond TheCondState;
132 std::vector<AsmCond> TheCondStack;
134 /// \brief maps directive names to handler methods in parser
135 /// extensions. Extensions register themselves in this map by calling
136 /// addDirectiveHandler.
137 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
139 /// \brief Map of currently defined macros.
140 StringMap<MCAsmMacro> MacroMap;
142 /// \brief Stack of active macro instantiations.
143 std::vector<MacroInstantiation*> ActiveMacros;
145 /// \brief List of bodies of anonymous macros.
146 std::deque<MCAsmMacro> MacroLikeBodies;
148 /// Boolean tracking whether macro substitution is enabled.
149 unsigned MacrosEnabledFlag : 1;
151 /// \brief Keeps track of how many .macro's have been instantiated.
152 unsigned NumOfMacroInstantiations;
154 /// Flag tracking whether any errors have been encountered.
155 unsigned HadError : 1;
157 /// The values from the last parsed cpp hash file line comment if any.
158 StringRef CppHashFilename;
159 int64_t CppHashLineNumber;
162 /// When generating dwarf for assembly source files we need to calculate the
163 /// logical line number based on the last parsed cpp hash file line comment
164 /// and current line. Since this is slow and messes up the SourceMgr's
165 /// cache we save the last info we queried with SrcMgr.FindLineNumber().
166 SMLoc LastQueryIDLoc;
167 unsigned LastQueryBuffer;
168 unsigned LastQueryLine;
170 /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
171 unsigned AssemblerDialect;
173 /// \brief is Darwin compatibility enabled?
176 /// \brief Are we parsing ms-style inline assembly?
177 bool ParsingInlineAsm;
180 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
181 const MCAsmInfo &MAI);
182 ~AsmParser() override;
184 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;
186 void addDirectiveHandler(StringRef Directive,
187 ExtensionDirectiveHandler Handler) override {
188 ExtensionDirectiveMap[Directive] = Handler;
191 void addAliasForDirective(StringRef Directive, StringRef Alias) override {
192 DirectiveKindMap[Directive] = DirectiveKindMap[Alias];
196 /// @name MCAsmParser Interface
199 SourceMgr &getSourceManager() override { return SrcMgr; }
200 MCAsmLexer &getLexer() override { return Lexer; }
201 MCContext &getContext() override { return Ctx; }
202 MCStreamer &getStreamer() override { return Out; }
203 unsigned getAssemblerDialect() override {
204 if (AssemblerDialect == ~0U)
205 return MAI.getAssemblerDialect();
207 return AssemblerDialect;
209 void setAssemblerDialect(unsigned i) override {
210 AssemblerDialect = i;
213 void Note(SMLoc L, const Twine &Msg,
214 ArrayRef<SMRange> Ranges = None) override;
215 bool Warning(SMLoc L, const Twine &Msg,
216 ArrayRef<SMRange> Ranges = None) override;
217 bool Error(SMLoc L, const Twine &Msg,
218 ArrayRef<SMRange> Ranges = None) override;
220 const AsmToken &Lex() override;
222 void setParsingInlineAsm(bool V) override { ParsingInlineAsm = V; }
223 bool isParsingInlineAsm() override { return ParsingInlineAsm; }
225 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
226 unsigned &NumOutputs, unsigned &NumInputs,
227 SmallVectorImpl<std::pair<void *,bool> > &OpDecls,
228 SmallVectorImpl<std::string> &Constraints,
229 SmallVectorImpl<std::string> &Clobbers,
230 const MCInstrInfo *MII, const MCInstPrinter *IP,
231 MCAsmParserSemaCallback &SI) override;
233 bool parseExpression(const MCExpr *&Res);
234 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
235 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) override;
236 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
237 bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
238 SMLoc &EndLoc) override;
239 bool parseAbsoluteExpression(int64_t &Res) override;
241 /// \brief Parse an identifier or string (as a quoted identifier)
242 /// and set \p Res to the identifier contents.
243 bool parseIdentifier(StringRef &Res) override;
244 void eatToEndOfStatement() override;
246 void checkForValidSection() override;
251 bool parseStatement(ParseStatementInfo &Info,
252 MCAsmParserSemaCallback *SI);
253 void eatToEndOfLine();
254 bool parseCppHashLineFilenameComment(const SMLoc &L);
256 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
257 ArrayRef<MCAsmMacroParameter> Parameters);
258 bool expandMacro(raw_svector_ostream &OS, StringRef Body,
259 ArrayRef<MCAsmMacroParameter> Parameters,
260 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable,
263 /// \brief Are macros enabled in the parser?
264 bool areMacrosEnabled() {return MacrosEnabledFlag;}
266 /// \brief Control a flag in the parser that enables or disables macros.
267 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}
269 /// \brief Lookup a previously defined macro.
270 /// \param Name Macro name.
271 /// \returns Pointer to macro. NULL if no such macro was defined.
272 const MCAsmMacro* lookupMacro(StringRef Name);
274 /// \brief Define a new macro with the given name and information.
275 void defineMacro(StringRef Name, MCAsmMacro Macro);
277 /// \brief Undefine a macro. If no such macro was defined, it's a no-op.
278 void undefineMacro(StringRef Name);
280 /// \brief Are we inside a macro instantiation?
281 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();}
283 /// \brief Handle entry to macro instantiation.
285 /// \param M The macro.
286 /// \param NameLoc Instantiation location.
287 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
289 /// \brief Handle exit from macro instantiation.
290 void handleMacroExit();
292 /// \brief Extract AsmTokens for a macro argument.
293 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg);
295 /// \brief Parse all macro arguments for a given macro.
296 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
298 void printMacroInstantiations();
299 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
300 ArrayRef<SMRange> Ranges = None) const {
301 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
303 static void DiagHandler(const SMDiagnostic &Diag, void *Context);
305 /// \brief Enter the specified file. This returns true on failure.
306 bool enterIncludeFile(const std::string &Filename);
308 /// \brief Process the specified file for the .incbin directive.
309 /// This returns true on failure.
310 bool processIncbinFile(const std::string &Filename);
312 /// \brief Reset the current lexer position to that given by \p Loc. The
313 /// current token is not set; clients should ensure Lex() is called
316 /// \param InBuffer If not 0, should be the known buffer id that contains the
318 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0);
320 /// \brief Parse up to the end of statement and a return the contents from the
321 /// current token until the end of the statement; the current token on exit
322 /// will be either the EndOfStatement or EOF.
323 StringRef parseStringToEndOfStatement() override;
325 /// \brief Parse until the end of a statement or a comma is encountered,
326 /// return the contents from the current token up to the end or comma.
327 StringRef parseStringToComma();
329 bool parseAssignment(StringRef Name, bool allow_redef,
330 bool NoDeadStrip = false);
332 unsigned getBinOpPrecedence(AsmToken::TokenKind K,
333 MCBinaryExpr::Opcode &Kind);
335 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
336 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
337 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);
339 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);
341 // Generic (target and platform independent) directive parsing.
343 DK_NO_DIRECTIVE, // Placeholder
344 DK_SET, DK_EQU, DK_EQUIV, DK_ASCII, DK_ASCIZ, DK_STRING, DK_BYTE, DK_SHORT,
345 DK_VALUE, DK_2BYTE, DK_LONG, DK_INT, DK_4BYTE, DK_QUAD, DK_8BYTE, DK_OCTA,
346 DK_SINGLE, DK_FLOAT, DK_DOUBLE, DK_ALIGN, DK_ALIGN32, DK_BALIGN, DK_BALIGNW,
347 DK_BALIGNL, DK_P2ALIGN, DK_P2ALIGNW, DK_P2ALIGNL, DK_ORG, DK_FILL, DK_ENDR,
348 DK_BUNDLE_ALIGN_MODE, DK_BUNDLE_LOCK, DK_BUNDLE_UNLOCK,
349 DK_ZERO, DK_EXTERN, DK_GLOBL, DK_GLOBAL,
350 DK_LAZY_REFERENCE, DK_NO_DEAD_STRIP, DK_SYMBOL_RESOLVER, DK_PRIVATE_EXTERN,
351 DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE,
352 DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT,
353 DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC,
354 DK_IF, DK_IFEQ, DK_IFGE, DK_IFGT, DK_IFLE, DK_IFLT, DK_IFNE, DK_IFB,
355 DK_IFNB, DK_IFC, DK_IFEQS, DK_IFNC, DK_IFNES, DK_IFDEF, DK_IFNDEF,
356 DK_IFNOTDEF, DK_ELSEIF, DK_ELSE, DK_ENDIF,
357 DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS,
358 DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA,
359 DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER,
360 DK_CFI_OFFSET, DK_CFI_REL_OFFSET, DK_CFI_PERSONALITY, DK_CFI_LSDA,
361 DK_CFI_REMEMBER_STATE, DK_CFI_RESTORE_STATE, DK_CFI_SAME_VALUE,
362 DK_CFI_RESTORE, DK_CFI_ESCAPE, DK_CFI_SIGNAL_FRAME, DK_CFI_UNDEFINED,
363 DK_CFI_REGISTER, DK_CFI_WINDOW_SAVE,
364 DK_MACROS_ON, DK_MACROS_OFF,
365 DK_MACRO, DK_EXITM, DK_ENDM, DK_ENDMACRO, DK_PURGEM,
366 DK_SLEB128, DK_ULEB128,
367 DK_ERR, DK_ERROR, DK_WARNING,
371 /// \brief Maps directive name --> DirectiveKind enum, for
372 /// directives parsed by this class.
373 StringMap<DirectiveKind> DirectiveKindMap;
375 // ".ascii", ".asciz", ".string"
376 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
377 bool parseDirectiveValue(unsigned Size); // ".byte", ".long", ...
378 bool parseDirectiveOctaValue(); // ".octa"
379 bool parseDirectiveRealValue(const fltSemantics &); // ".single", ...
380 bool parseDirectiveFill(); // ".fill"
381 bool parseDirectiveZero(); // ".zero"
382 // ".set", ".equ", ".equiv"
383 bool parseDirectiveSet(StringRef IDVal, bool allow_redef);
384 bool parseDirectiveOrg(); // ".org"
385 // ".align{,32}", ".p2align{,w,l}"
386 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize);
388 // ".file", ".line", ".loc", ".stabs"
389 bool parseDirectiveFile(SMLoc DirectiveLoc);
390 bool parseDirectiveLine();
391 bool parseDirectiveLoc();
392 bool parseDirectiveStabs();
395 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc);
396 bool parseDirectiveCFIWindowSave();
397 bool parseDirectiveCFISections();
398 bool parseDirectiveCFIStartProc();
399 bool parseDirectiveCFIEndProc();
400 bool parseDirectiveCFIDefCfaOffset();
401 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
402 bool parseDirectiveCFIAdjustCfaOffset();
403 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
404 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
405 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
406 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
407 bool parseDirectiveCFIRememberState();
408 bool parseDirectiveCFIRestoreState();
409 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
410 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
411 bool parseDirectiveCFIEscape();
412 bool parseDirectiveCFISignalFrame();
413 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
416 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
417 bool parseDirectiveExitMacro(StringRef Directive);
418 bool parseDirectiveEndMacro(StringRef Directive);
419 bool parseDirectiveMacro(SMLoc DirectiveLoc);
420 bool parseDirectiveMacrosOnOff(StringRef Directive);
422 // ".bundle_align_mode"
423 bool parseDirectiveBundleAlignMode();
425 bool parseDirectiveBundleLock();
427 bool parseDirectiveBundleUnlock();
430 bool parseDirectiveSpace(StringRef IDVal);
432 // .sleb128 (Signed=true) and .uleb128 (Signed=false)
433 bool parseDirectiveLEB128(bool Signed);
435 /// \brief Parse a directive like ".globl" which
436 /// accepts a single symbol (which should be a label or an external).
437 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);
439 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
441 bool parseDirectiveAbort(); // ".abort"
442 bool parseDirectiveInclude(); // ".include"
443 bool parseDirectiveIncbin(); // ".incbin"
445 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne"
446 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
447 // ".ifb" or ".ifnb", depending on ExpectBlank.
448 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
449 // ".ifc" or ".ifnc", depending on ExpectEqual.
450 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
451 // ".ifeqs" or ".ifnes", depending on ExpectEqual.
452 bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual);
453 // ".ifdef" or ".ifndef", depending on expect_defined
454 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
455 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
456 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
457 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
458 bool parseEscapedString(std::string &Data) override;
460 const MCExpr *applyModifierToExpr(const MCExpr *E,
461 MCSymbolRefExpr::VariantKind Variant);
463 // Macro-like directives
464 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
465 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
466 raw_svector_ostream &OS);
467 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive);
468 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
469 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
470 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
472 // "_emit" or "__emit"
473 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
477 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
480 bool parseDirectiveEnd(SMLoc DirectiveLoc);
482 // ".err" or ".error"
483 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage);
486 bool parseDirectiveWarning(SMLoc DirectiveLoc);
488 void initializeDirectiveKindMap();
494 extern MCAsmParserExtension *createDarwinAsmParser();
495 extern MCAsmParserExtension *createELFAsmParser();
496 extern MCAsmParserExtension *createCOFFAsmParser();
500 enum { DEFAULT_ADDRSPACE = 0 };
502 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
503 const MCAsmInfo &MAI)
504 : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM),
505 PlatformParser(nullptr), CurBuffer(SM.getMainFileID()),
506 MacrosEnabledFlag(true), HadError(false), CppHashLineNumber(0),
507 AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false) {
508 // Save the old handler.
509 SavedDiagHandler = SrcMgr.getDiagHandler();
510 SavedDiagContext = SrcMgr.getDiagContext();
511 // Set our own handler which calls the saved handler.
512 SrcMgr.setDiagHandler(DiagHandler, this);
513 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
515 // Initialize the platform / file format parser.
516 switch (Ctx.getObjectFileInfo()->getObjectFileType()) {
517 case MCObjectFileInfo::IsCOFF:
518 PlatformParser.reset(createCOFFAsmParser());
520 case MCObjectFileInfo::IsMachO:
521 PlatformParser.reset(createDarwinAsmParser());
524 case MCObjectFileInfo::IsELF:
525 PlatformParser.reset(createELFAsmParser());
529 PlatformParser->Initialize(*this);
530 initializeDirectiveKindMap();
532 NumOfMacroInstantiations = 0;
535 AsmParser::~AsmParser() {
536 assert((HadError || ActiveMacros.empty()) &&
537 "Unexpected active macro instantiation!");
540 void AsmParser::printMacroInstantiations() {
541 // Print the active macro instantiation stack.
542 for (std::vector<MacroInstantiation *>::const_reverse_iterator
543 it = ActiveMacros.rbegin(),
544 ie = ActiveMacros.rend();
546 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
547 "while in macro instantiation");
550 void AsmParser::Note(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
551 printMessage(L, SourceMgr::DK_Note, Msg, Ranges);
552 printMacroInstantiations();
555 bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
556 if(getTargetParser().getTargetOptions().MCNoWarn)
558 if (getTargetParser().getTargetOptions().MCFatalWarnings)
559 return Error(L, Msg, Ranges);
560 printMessage(L, SourceMgr::DK_Warning, Msg, Ranges);
561 printMacroInstantiations();
565 bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
567 printMessage(L, SourceMgr::DK_Error, Msg, Ranges);
568 printMacroInstantiations();
572 bool AsmParser::enterIncludeFile(const std::string &Filename) {
573 std::string IncludedFile;
575 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
580 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
584 /// Process the specified .incbin file by searching for it in the include paths
585 /// then just emitting the byte contents of the file to the streamer. This
586 /// returns true on failure.
587 bool AsmParser::processIncbinFile(const std::string &Filename) {
588 std::string IncludedFile;
590 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
594 // Pick up the bytes from the file and emit them.
595 getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer());
599 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) {
600 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
601 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
605 const AsmToken &AsmParser::Lex() {
606 const AsmToken *tok = &Lexer.Lex();
608 if (tok->is(AsmToken::Eof)) {
609 // If this is the end of an included file, pop the parent file off the
611 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
612 if (ParentIncludeLoc != SMLoc()) {
613 jumpToLoc(ParentIncludeLoc);
618 if (tok->is(AsmToken::Error))
619 Error(Lexer.getErrLoc(), Lexer.getErr());
624 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
625 // Create the initial section, if requested.
626 if (!NoInitialTextSection)
627 Out.InitSections(false);
633 AsmCond StartingCondState = TheCondState;
635 // If we are generating dwarf for assembly source files save the initial text
636 // section and generate a .file directive.
637 if (getContext().getGenDwarfForAssembly()) {
638 MCSection *Sec = getStreamer().getCurrentSection().first;
639 if (!Sec->getBeginSymbol()) {
640 MCSymbol *SectionStartSym = getContext().createTempSymbol();
641 getStreamer().EmitLabel(SectionStartSym);
642 Sec->setBeginSymbol(SectionStartSym);
644 bool InsertResult = getContext().addGenDwarfSection(Sec);
645 assert(InsertResult && ".text section should not have debug info yet");
647 getContext().setGenDwarfFileNumber(getStreamer().EmitDwarfFileDirective(
648 0, StringRef(), getContext().getMainFileName()));
651 // While we have input, parse each statement.
652 while (Lexer.isNot(AsmToken::Eof)) {
653 ParseStatementInfo Info;
654 if (!parseStatement(Info, nullptr))
657 // We had an error, validate that one was emitted and recover by skipping to
659 assert(HadError && "Parse statement returned an error, but none emitted!");
660 eatToEndOfStatement();
663 if (TheCondState.TheCond != StartingCondState.TheCond ||
664 TheCondState.Ignore != StartingCondState.Ignore)
665 return TokError("unmatched .ifs or .elses");
667 // Check to see there are no empty DwarfFile slots.
668 const auto &LineTables = getContext().getMCDwarfLineTables();
669 if (!LineTables.empty()) {
671 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) {
672 if (File.Name.empty() && Index != 0)
673 TokError("unassigned file number: " + Twine(Index) +
674 " for .file directives");
679 // Check to see that all assembler local symbols were actually defined.
680 // Targets that don't do subsections via symbols may not want this, though,
681 // so conservatively exclude them. Only do this if we're finalizing, though,
682 // as otherwise we won't necessarilly have seen everything yet.
683 if (!NoFinalize && MAI.hasSubsectionsViaSymbols()) {
684 const MCContext::SymbolTable &Symbols = getContext().getSymbols();
685 for (MCContext::SymbolTable::const_iterator i = Symbols.begin(),
688 MCSymbol *Sym = i->getValue();
689 // Variable symbols may not be marked as defined, so check those
690 // explicitly. If we know it's a variable, we have a definition for
691 // the purposes of this check.
692 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
693 // FIXME: We would really like to refer back to where the symbol was
694 // first referenced for a source location. We need to add something
695 // to track that. Currently, we just point to the end of the file.
696 printMessage(getLexer().getLoc(), SourceMgr::DK_Error,
697 "assembler local symbol '" + Sym->getName() +
702 // Finalize the output stream if there are no errors and if the client wants
704 if (!HadError && !NoFinalize)
710 void AsmParser::checkForValidSection() {
711 if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) {
712 TokError("expected section directive before assembly directive");
713 Out.InitSections(false);
717 /// \brief Throw away the rest of the line for testing purposes.
718 void AsmParser::eatToEndOfStatement() {
719 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
723 if (Lexer.is(AsmToken::EndOfStatement))
727 StringRef AsmParser::parseStringToEndOfStatement() {
728 const char *Start = getTok().getLoc().getPointer();
730 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
733 const char *End = getTok().getLoc().getPointer();
734 return StringRef(Start, End - Start);
737 StringRef AsmParser::parseStringToComma() {
738 const char *Start = getTok().getLoc().getPointer();
740 while (Lexer.isNot(AsmToken::EndOfStatement) &&
741 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
744 const char *End = getTok().getLoc().getPointer();
745 return StringRef(Start, End - Start);
748 /// \brief Parse a paren expression and return it.
749 /// NOTE: This assumes the leading '(' has already been consumed.
751 /// parenexpr ::= expr)
753 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
754 if (parseExpression(Res))
756 if (Lexer.isNot(AsmToken::RParen))
757 return TokError("expected ')' in parentheses expression");
758 EndLoc = Lexer.getTok().getEndLoc();
763 /// \brief Parse a bracket expression and return it.
764 /// NOTE: This assumes the leading '[' has already been consumed.
766 /// bracketexpr ::= expr]
768 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
769 if (parseExpression(Res))
771 if (Lexer.isNot(AsmToken::RBrac))
772 return TokError("expected ']' in brackets expression");
773 EndLoc = Lexer.getTok().getEndLoc();
778 /// \brief Parse a primary expression and return it.
779 /// primaryexpr ::= (parenexpr
780 /// primaryexpr ::= symbol
781 /// primaryexpr ::= number
782 /// primaryexpr ::= '.'
783 /// primaryexpr ::= ~,+,- primaryexpr
784 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
785 SMLoc FirstTokenLoc = getLexer().getLoc();
786 AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
787 switch (FirstTokenKind) {
789 return TokError("unknown token in expression");
790 // If we have an error assume that we've already handled it.
791 case AsmToken::Error:
793 case AsmToken::Exclaim:
794 Lex(); // Eat the operator.
795 if (parsePrimaryExpr(Res, EndLoc))
797 Res = MCUnaryExpr::createLNot(Res, getContext());
799 case AsmToken::Dollar:
801 case AsmToken::String:
802 case AsmToken::Identifier: {
803 StringRef Identifier;
804 if (parseIdentifier(Identifier)) {
805 if (FirstTokenKind == AsmToken::Dollar) {
806 if (Lexer.getMAI().getDollarIsPC()) {
807 // This is a '$' reference, which references the current PC. Emit a
808 // temporary label to the streamer and refer to it.
809 MCSymbol *Sym = Ctx.createTempSymbol();
811 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None,
813 EndLoc = FirstTokenLoc;
816 return Error(FirstTokenLoc, "invalid token in expression");
819 // Parse symbol variant
820 std::pair<StringRef, StringRef> Split;
821 if (!MAI.useParensForSymbolVariant()) {
822 if (FirstTokenKind == AsmToken::String) {
823 if (Lexer.is(AsmToken::At)) {
824 Lexer.Lex(); // eat @
825 SMLoc AtLoc = getLexer().getLoc();
827 if (parseIdentifier(VName))
828 return Error(AtLoc, "expected symbol variant after '@'");
830 Split = std::make_pair(Identifier, VName);
833 Split = Identifier.split('@');
835 } else if (Lexer.is(AsmToken::LParen)) {
836 Lexer.Lex(); // eat (
838 parseIdentifier(VName);
839 if (Lexer.isNot(AsmToken::RParen)) {
840 return Error(Lexer.getTok().getLoc(),
841 "unexpected token in variant, expected ')'");
843 Lexer.Lex(); // eat )
844 Split = std::make_pair(Identifier, VName);
847 EndLoc = SMLoc::getFromPointer(Identifier.end());
849 // This is a symbol reference.
850 StringRef SymbolName = Identifier;
851 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
853 // Lookup the symbol variant if used.
854 if (Split.second.size()) {
855 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
856 if (Variant != MCSymbolRefExpr::VK_Invalid) {
857 SymbolName = Split.first;
858 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) {
859 Variant = MCSymbolRefExpr::VK_None;
861 return Error(SMLoc::getFromPointer(Split.second.begin()),
862 "invalid variant '" + Split.second + "'");
866 MCSymbol *Sym = getContext().getOrCreateSymbol(SymbolName);
868 // If this is an absolute variable reference, substitute it now to preserve
869 // semantics in the face of reassignment.
870 if (Sym->isVariable() &&
871 isa<MCConstantExpr>(Sym->getVariableValue(/*SetUsed*/ false))) {
873 return Error(EndLoc, "unexpected modifier on variable reference");
875 Res = Sym->getVariableValue(/*SetUsed*/ false);
879 // Otherwise create a symbol ref.
880 Res = MCSymbolRefExpr::create(Sym, Variant, getContext());
883 case AsmToken::BigNum:
884 return TokError("literal value out of range for directive");
885 case AsmToken::Integer: {
886 SMLoc Loc = getTok().getLoc();
887 int64_t IntVal = getTok().getIntVal();
888 Res = MCConstantExpr::create(IntVal, getContext());
889 EndLoc = Lexer.getTok().getEndLoc();
891 // Look for 'b' or 'f' following an Integer as a directional label
892 if (Lexer.getKind() == AsmToken::Identifier) {
893 StringRef IDVal = getTok().getString();
894 // Lookup the symbol variant if used.
895 std::pair<StringRef, StringRef> Split = IDVal.split('@');
896 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
897 if (Split.first.size() != IDVal.size()) {
898 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
899 if (Variant == MCSymbolRefExpr::VK_Invalid)
900 return TokError("invalid variant '" + Split.second + "'");
903 if (IDVal == "f" || IDVal == "b") {
905 Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b");
906 Res = MCSymbolRefExpr::create(Sym, Variant, getContext());
907 if (IDVal == "b" && Sym->isUndefined())
908 return Error(Loc, "invalid reference to undefined symbol");
909 EndLoc = Lexer.getTok().getEndLoc();
910 Lex(); // Eat identifier.
915 case AsmToken::Real: {
916 APFloat RealVal(APFloat::IEEEdouble, getTok().getString());
917 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
918 Res = MCConstantExpr::create(IntVal, getContext());
919 EndLoc = Lexer.getTok().getEndLoc();
923 case AsmToken::Dot: {
924 // This is a '.' reference, which references the current PC. Emit a
925 // temporary label to the streamer and refer to it.
926 MCSymbol *Sym = Ctx.createTempSymbol();
928 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
929 EndLoc = Lexer.getTok().getEndLoc();
930 Lex(); // Eat identifier.
933 case AsmToken::LParen:
934 Lex(); // Eat the '('.
935 return parseParenExpr(Res, EndLoc);
936 case AsmToken::LBrac:
937 if (!PlatformParser->HasBracketExpressions())
938 return TokError("brackets expression not supported on this target");
939 Lex(); // Eat the '['.
940 return parseBracketExpr(Res, EndLoc);
941 case AsmToken::Minus:
942 Lex(); // Eat the operator.
943 if (parsePrimaryExpr(Res, EndLoc))
945 Res = MCUnaryExpr::createMinus(Res, getContext());
948 Lex(); // Eat the operator.
949 if (parsePrimaryExpr(Res, EndLoc))
951 Res = MCUnaryExpr::createPlus(Res, getContext());
953 case AsmToken::Tilde:
954 Lex(); // Eat the operator.
955 if (parsePrimaryExpr(Res, EndLoc))
957 Res = MCUnaryExpr::createNot(Res, getContext());
962 bool AsmParser::parseExpression(const MCExpr *&Res) {
964 return parseExpression(Res, EndLoc);
968 AsmParser::applyModifierToExpr(const MCExpr *E,
969 MCSymbolRefExpr::VariantKind Variant) {
970 // Ask the target implementation about this expression first.
971 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
974 // Recurse over the given expression, rebuilding it to apply the given variant
975 // if there is exactly one symbol.
976 switch (E->getKind()) {
978 case MCExpr::Constant:
981 case MCExpr::SymbolRef: {
982 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
984 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
985 TokError("invalid variant on expression '" + getTok().getIdentifier() +
986 "' (already modified)");
990 return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext());
993 case MCExpr::Unary: {
994 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
995 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
998 return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext());
1001 case MCExpr::Binary: {
1002 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
1003 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
1004 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
1014 return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext());
1018 llvm_unreachable("Invalid expression kind!");
1021 /// \brief Parse an expression and return it.
1023 /// expr ::= expr &&,|| expr -> lowest.
1024 /// expr ::= expr |,^,&,! expr
1025 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr
1026 /// expr ::= expr <<,>> expr
1027 /// expr ::= expr +,- expr
1028 /// expr ::= expr *,/,% expr -> highest.
1029 /// expr ::= primaryexpr
1031 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1032 // Parse the expression.
1034 if (parsePrimaryExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc))
1037 // As a special case, we support 'a op b @ modifier' by rewriting the
1038 // expression to include the modifier. This is inefficient, but in general we
1039 // expect users to use 'a@modifier op b'.
1040 if (Lexer.getKind() == AsmToken::At) {
1043 if (Lexer.isNot(AsmToken::Identifier))
1044 return TokError("unexpected symbol modifier following '@'");
1046 MCSymbolRefExpr::VariantKind Variant =
1047 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
1048 if (Variant == MCSymbolRefExpr::VK_Invalid)
1049 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
1051 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
1053 return TokError("invalid modifier '" + getTok().getIdentifier() +
1054 "' (no symbols present)");
1061 // Try to constant fold it up front, if possible.
1063 if (Res->evaluateAsAbsolute(Value))
1064 Res = MCConstantExpr::create(Value, getContext());
1069 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1071 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1074 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
1076 if (parseParenExpr(Res, EndLoc))
1079 for (; ParenDepth > 0; --ParenDepth) {
1080 if (parseBinOpRHS(1, Res, EndLoc))
1083 // We don't Lex() the last RParen.
1084 // This is the same behavior as parseParenExpression().
1085 if (ParenDepth - 1 > 0) {
1086 if (Lexer.isNot(AsmToken::RParen))
1087 return TokError("expected ')' in parentheses expression");
1088 EndLoc = Lexer.getTok().getEndLoc();
1095 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1098 SMLoc StartLoc = Lexer.getLoc();
1099 if (parseExpression(Expr))
1102 if (!Expr->evaluateAsAbsolute(Res))
1103 return Error(StartLoc, "expected absolute expression");
1108 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K,
1109 MCBinaryExpr::Opcode &Kind) {
1112 return 0; // not a binop.
1114 // Lowest Precedence: &&, ||
1115 case AsmToken::AmpAmp:
1116 Kind = MCBinaryExpr::LAnd;
1118 case AsmToken::PipePipe:
1119 Kind = MCBinaryExpr::LOr;
1122 // Low Precedence: |, &, ^
1124 // FIXME: gas seems to support '!' as an infix operator?
1125 case AsmToken::Pipe:
1126 Kind = MCBinaryExpr::Or;
1128 case AsmToken::Caret:
1129 Kind = MCBinaryExpr::Xor;
1132 Kind = MCBinaryExpr::And;
1135 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1136 case AsmToken::EqualEqual:
1137 Kind = MCBinaryExpr::EQ;
1139 case AsmToken::ExclaimEqual:
1140 case AsmToken::LessGreater:
1141 Kind = MCBinaryExpr::NE;
1143 case AsmToken::Less:
1144 Kind = MCBinaryExpr::LT;
1146 case AsmToken::LessEqual:
1147 Kind = MCBinaryExpr::LTE;
1149 case AsmToken::Greater:
1150 Kind = MCBinaryExpr::GT;
1152 case AsmToken::GreaterEqual:
1153 Kind = MCBinaryExpr::GTE;
1156 // Intermediate Precedence: <<, >>
1157 case AsmToken::LessLess:
1158 Kind = MCBinaryExpr::Shl;
1160 case AsmToken::GreaterGreater:
1161 Kind = MAI.shouldUseLogicalShr() ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1164 // High Intermediate Precedence: +, -
1165 case AsmToken::Plus:
1166 Kind = MCBinaryExpr::Add;
1168 case AsmToken::Minus:
1169 Kind = MCBinaryExpr::Sub;
1172 // Highest Precedence: *, /, %
1173 case AsmToken::Star:
1174 Kind = MCBinaryExpr::Mul;
1176 case AsmToken::Slash:
1177 Kind = MCBinaryExpr::Div;
1179 case AsmToken::Percent:
1180 Kind = MCBinaryExpr::Mod;
1185 /// \brief Parse all binary operators with precedence >= 'Precedence'.
1186 /// Res contains the LHS of the expression on input.
1187 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1190 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1191 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1193 // If the next token is lower precedence than we are allowed to eat, return
1194 // successfully with what we ate already.
1195 if (TokPrec < Precedence)
1200 // Eat the next primary expression.
1202 if (parsePrimaryExpr(RHS, EndLoc))
1205 // If BinOp binds less tightly with RHS than the operator after RHS, let
1206 // the pending operator take RHS as its LHS.
1207 MCBinaryExpr::Opcode Dummy;
1208 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1209 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1212 // Merge LHS and RHS according to operator.
1213 Res = MCBinaryExpr::create(Kind, Res, RHS, getContext());
1218 /// ::= EndOfStatement
1219 /// ::= Label* Directive ...Operands... EndOfStatement
1220 /// ::= Label* Identifier OperandList* EndOfStatement
1221 bool AsmParser::parseStatement(ParseStatementInfo &Info,
1222 MCAsmParserSemaCallback *SI) {
1223 if (Lexer.is(AsmToken::EndOfStatement)) {
1229 // Statements always start with an identifier or are a full line comment.
1230 AsmToken ID = getTok();
1231 SMLoc IDLoc = ID.getLoc();
1233 int64_t LocalLabelVal = -1;
1234 // A full line comment is a '#' as the first token.
1235 if (Lexer.is(AsmToken::Hash))
1236 return parseCppHashLineFilenameComment(IDLoc);
1238 // Allow an integer followed by a ':' as a directional local label.
1239 if (Lexer.is(AsmToken::Integer)) {
1240 LocalLabelVal = getTok().getIntVal();
1241 if (LocalLabelVal < 0) {
1242 if (!TheCondState.Ignore)
1243 return TokError("unexpected token at start of statement");
1246 IDVal = getTok().getString();
1247 Lex(); // Consume the integer token to be used as an identifier token.
1248 if (Lexer.getKind() != AsmToken::Colon) {
1249 if (!TheCondState.Ignore)
1250 return TokError("unexpected token at start of statement");
1253 } else if (Lexer.is(AsmToken::Dot)) {
1254 // Treat '.' as a valid identifier in this context.
1257 } else if (parseIdentifier(IDVal)) {
1258 if (!TheCondState.Ignore)
1259 return TokError("unexpected token at start of statement");
1263 // Handle conditional assembly here before checking for skipping. We
1264 // have to do this so that .endif isn't skipped in a ".if 0" block for
1266 StringMap<DirectiveKind>::const_iterator DirKindIt =
1267 DirectiveKindMap.find(IDVal);
1268 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1270 : DirKindIt->getValue();
1281 return parseDirectiveIf(IDLoc, DirKind);
1283 return parseDirectiveIfb(IDLoc, true);
1285 return parseDirectiveIfb(IDLoc, false);
1287 return parseDirectiveIfc(IDLoc, true);
1289 return parseDirectiveIfeqs(IDLoc, true);
1291 return parseDirectiveIfc(IDLoc, false);
1293 return parseDirectiveIfeqs(IDLoc, false);
1295 return parseDirectiveIfdef(IDLoc, true);
1298 return parseDirectiveIfdef(IDLoc, false);
1300 return parseDirectiveElseIf(IDLoc);
1302 return parseDirectiveElse(IDLoc);
1304 return parseDirectiveEndIf(IDLoc);
1307 // Ignore the statement if in the middle of inactive conditional
1309 if (TheCondState.Ignore) {
1310 eatToEndOfStatement();
1314 // FIXME: Recurse on local labels?
1316 // See what kind of statement we have.
1317 switch (Lexer.getKind()) {
1318 case AsmToken::Colon: {
1319 checkForValidSection();
1321 // identifier ':' -> Label.
1324 // Diagnose attempt to use '.' as a label.
1326 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1328 // Diagnose attempt to use a variable as a label.
1330 // FIXME: Diagnostics. Note the location of the definition as a label.
1331 // FIXME: This doesn't diagnose assignment to a symbol which has been
1332 // implicitly marked as external.
1334 if (LocalLabelVal == -1) {
1335 if (ParsingInlineAsm && SI) {
1336 StringRef RewrittenLabel =
1337 SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
1338 assert(RewrittenLabel.size() &&
1339 "We should have an internal name here.");
1340 Info.AsmRewrites->push_back(AsmRewrite(AOK_Label, IDLoc,
1341 IDVal.size(), RewrittenLabel));
1342 IDVal = RewrittenLabel;
1344 Sym = getContext().getOrCreateSymbol(IDVal);
1346 Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal);
1348 Sym->redefineIfPossible();
1350 if (!Sym->isUndefined() || Sym->isVariable())
1351 return Error(IDLoc, "invalid symbol redefinition");
1354 if (!ParsingInlineAsm)
1357 // If we are generating dwarf for assembly source files then gather the
1358 // info to make a dwarf label entry for this label if needed.
1359 if (getContext().getGenDwarfForAssembly())
1360 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1363 getTargetParser().onLabelParsed(Sym);
1365 // Consume any end of statement token, if present, to avoid spurious
1366 // AddBlankLine calls().
1367 if (Lexer.is(AsmToken::EndOfStatement)) {
1369 if (Lexer.is(AsmToken::Eof))
1376 case AsmToken::Equal:
1377 // identifier '=' ... -> assignment statement
1380 return parseAssignment(IDVal, true);
1382 default: // Normal instruction or directive.
1386 // If macros are enabled, check to see if this is a macro instantiation.
1387 if (areMacrosEnabled())
1388 if (const MCAsmMacro *M = lookupMacro(IDVal)) {
1389 return handleMacroEntry(M, IDLoc);
1392 // Otherwise, we have a normal instruction or directive.
1394 // Directives start with "."
1395 if (IDVal[0] == '.' && IDVal != ".") {
1396 // There are several entities interested in parsing directives:
1398 // 1. The target-specific assembly parser. Some directives are target
1399 // specific or may potentially behave differently on certain targets.
1400 // 2. Asm parser extensions. For example, platform-specific parsers
1401 // (like the ELF parser) register themselves as extensions.
1402 // 3. The generic directive parser implemented by this class. These are
1403 // all the directives that behave in a target and platform independent
1404 // manner, or at least have a default behavior that's shared between
1405 // all targets and platforms.
1407 // First query the target-specific parser. It will return 'true' if it
1408 // isn't interested in this directive.
1409 if (!getTargetParser().ParseDirective(ID))
1412 // Next, check the extension directive map to see if any extension has
1413 // registered itself to parse this directive.
1414 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
1415 ExtensionDirectiveMap.lookup(IDVal);
1417 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1419 // Finally, if no one else is interested in this directive, it must be
1420 // generic and familiar to this class.
1426 return parseDirectiveSet(IDVal, true);
1428 return parseDirectiveSet(IDVal, false);
1430 return parseDirectiveAscii(IDVal, false);
1433 return parseDirectiveAscii(IDVal, true);
1435 return parseDirectiveValue(1);
1439 return parseDirectiveValue(2);
1443 return parseDirectiveValue(4);
1446 return parseDirectiveValue(8);
1448 return parseDirectiveOctaValue();
1451 return parseDirectiveRealValue(APFloat::IEEEsingle);
1453 return parseDirectiveRealValue(APFloat::IEEEdouble);
1455 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1456 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1459 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1460 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1463 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1465 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1467 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1469 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1471 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1473 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1475 return parseDirectiveOrg();
1477 return parseDirectiveFill();
1479 return parseDirectiveZero();
1481 eatToEndOfStatement(); // .extern is the default, ignore it.
1485 return parseDirectiveSymbolAttribute(MCSA_Global);
1486 case DK_LAZY_REFERENCE:
1487 return parseDirectiveSymbolAttribute(MCSA_LazyReference);
1488 case DK_NO_DEAD_STRIP:
1489 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1490 case DK_SYMBOL_RESOLVER:
1491 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1492 case DK_PRIVATE_EXTERN:
1493 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1495 return parseDirectiveSymbolAttribute(MCSA_Reference);
1496 case DK_WEAK_DEFINITION:
1497 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1498 case DK_WEAK_REFERENCE:
1499 return parseDirectiveSymbolAttribute(MCSA_WeakReference);
1500 case DK_WEAK_DEF_CAN_BE_HIDDEN:
1501 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1504 return parseDirectiveComm(/*IsLocal=*/false);
1506 return parseDirectiveComm(/*IsLocal=*/true);
1508 return parseDirectiveAbort();
1510 return parseDirectiveInclude();
1512 return parseDirectiveIncbin();
1515 return TokError(Twine(IDVal) + " not supported yet");
1517 return parseDirectiveRept(IDLoc, IDVal);
1519 return parseDirectiveIrp(IDLoc);
1521 return parseDirectiveIrpc(IDLoc);
1523 return parseDirectiveEndr(IDLoc);
1524 case DK_BUNDLE_ALIGN_MODE:
1525 return parseDirectiveBundleAlignMode();
1526 case DK_BUNDLE_LOCK:
1527 return parseDirectiveBundleLock();
1528 case DK_BUNDLE_UNLOCK:
1529 return parseDirectiveBundleUnlock();
1531 return parseDirectiveLEB128(true);
1533 return parseDirectiveLEB128(false);
1536 return parseDirectiveSpace(IDVal);
1538 return parseDirectiveFile(IDLoc);
1540 return parseDirectiveLine();
1542 return parseDirectiveLoc();
1544 return parseDirectiveStabs();
1545 case DK_CFI_SECTIONS:
1546 return parseDirectiveCFISections();
1547 case DK_CFI_STARTPROC:
1548 return parseDirectiveCFIStartProc();
1549 case DK_CFI_ENDPROC:
1550 return parseDirectiveCFIEndProc();
1551 case DK_CFI_DEF_CFA:
1552 return parseDirectiveCFIDefCfa(IDLoc);
1553 case DK_CFI_DEF_CFA_OFFSET:
1554 return parseDirectiveCFIDefCfaOffset();
1555 case DK_CFI_ADJUST_CFA_OFFSET:
1556 return parseDirectiveCFIAdjustCfaOffset();
1557 case DK_CFI_DEF_CFA_REGISTER:
1558 return parseDirectiveCFIDefCfaRegister(IDLoc);
1560 return parseDirectiveCFIOffset(IDLoc);
1561 case DK_CFI_REL_OFFSET:
1562 return parseDirectiveCFIRelOffset(IDLoc);
1563 case DK_CFI_PERSONALITY:
1564 return parseDirectiveCFIPersonalityOrLsda(true);
1566 return parseDirectiveCFIPersonalityOrLsda(false);
1567 case DK_CFI_REMEMBER_STATE:
1568 return parseDirectiveCFIRememberState();
1569 case DK_CFI_RESTORE_STATE:
1570 return parseDirectiveCFIRestoreState();
1571 case DK_CFI_SAME_VALUE:
1572 return parseDirectiveCFISameValue(IDLoc);
1573 case DK_CFI_RESTORE:
1574 return parseDirectiveCFIRestore(IDLoc);
1576 return parseDirectiveCFIEscape();
1577 case DK_CFI_SIGNAL_FRAME:
1578 return parseDirectiveCFISignalFrame();
1579 case DK_CFI_UNDEFINED:
1580 return parseDirectiveCFIUndefined(IDLoc);
1581 case DK_CFI_REGISTER:
1582 return parseDirectiveCFIRegister(IDLoc);
1583 case DK_CFI_WINDOW_SAVE:
1584 return parseDirectiveCFIWindowSave();
1587 return parseDirectiveMacrosOnOff(IDVal);
1589 return parseDirectiveMacro(IDLoc);
1591 return parseDirectiveExitMacro(IDVal);
1594 return parseDirectiveEndMacro(IDVal);
1596 return parseDirectivePurgeMacro(IDLoc);
1598 return parseDirectiveEnd(IDLoc);
1600 return parseDirectiveError(IDLoc, false);
1602 return parseDirectiveError(IDLoc, true);
1604 return parseDirectiveWarning(IDLoc);
1607 return Error(IDLoc, "unknown directive");
1610 // __asm _emit or __asm __emit
1611 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
1612 IDVal == "_EMIT" || IDVal == "__EMIT"))
1613 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
1616 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
1617 return parseDirectiveMSAlign(IDLoc, Info);
1619 checkForValidSection();
1621 // Canonicalize the opcode to lower case.
1622 std::string OpcodeStr = IDVal.lower();
1623 ParseInstructionInfo IInfo(Info.AsmRewrites);
1624 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, IDLoc,
1625 Info.ParsedOperands);
1626 Info.ParseError = HadError;
1628 // Dump the parsed representation, if requested.
1629 if (getShowParsedOperands()) {
1630 SmallString<256> Str;
1631 raw_svector_ostream OS(Str);
1632 OS << "parsed instruction: [";
1633 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
1636 Info.ParsedOperands[i]->print(OS);
1640 printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
1643 // If we are generating dwarf for the current section then generate a .loc
1644 // directive for the instruction.
1645 if (!HadError && getContext().getGenDwarfForAssembly() &&
1646 getContext().getGenDwarfSectionSyms().count(
1647 getStreamer().getCurrentSection().first)) {
1649 if (ActiveMacros.empty())
1650 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
1652 Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc,
1653 ActiveMacros.front()->ExitBuffer);
1655 // If we previously parsed a cpp hash file line comment then make sure the
1656 // current Dwarf File is for the CppHashFilename if not then emit the
1657 // Dwarf File table for it and adjust the line number for the .loc.
1658 if (CppHashFilename.size()) {
1659 unsigned FileNumber = getStreamer().EmitDwarfFileDirective(
1660 0, StringRef(), CppHashFilename);
1661 getContext().setGenDwarfFileNumber(FileNumber);
1663 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's
1664 // cache with the different Loc from the call above we save the last
1665 // info we queried here with SrcMgr.FindLineNumber().
1666 unsigned CppHashLocLineNo;
1667 if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf)
1668 CppHashLocLineNo = LastQueryLine;
1670 CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf);
1671 LastQueryLine = CppHashLocLineNo;
1672 LastQueryIDLoc = CppHashLoc;
1673 LastQueryBuffer = CppHashBuf;
1675 Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo);
1678 getStreamer().EmitDwarfLocDirective(
1679 getContext().getGenDwarfFileNumber(), Line, 0,
1680 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0,
1684 // If parsing succeeded, match the instruction.
1687 getTargetParser().MatchAndEmitInstruction(IDLoc, Info.Opcode,
1688 Info.ParsedOperands, Out,
1689 ErrorInfo, ParsingInlineAsm);
1692 // Don't skip the rest of the line, the instruction parser is responsible for
1697 /// eatToEndOfLine uses the Lexer to eat the characters to the end of the line
1698 /// since they may not be able to be tokenized to get to the end of line token.
1699 void AsmParser::eatToEndOfLine() {
1700 if (!Lexer.is(AsmToken::EndOfStatement))
1701 Lexer.LexUntilEndOfLine();
1706 /// parseCppHashLineFilenameComment as this:
1707 /// ::= # number "filename"
1708 /// or just as a full line comment if it doesn't have a number and a string.
1709 bool AsmParser::parseCppHashLineFilenameComment(const SMLoc &L) {
1710 Lex(); // Eat the hash token.
1712 if (getLexer().isNot(AsmToken::Integer)) {
1713 // Consume the line since in cases it is not a well-formed line directive,
1714 // as if were simply a full line comment.
1719 int64_t LineNumber = getTok().getIntVal();
1722 if (getLexer().isNot(AsmToken::String)) {
1727 StringRef Filename = getTok().getString();
1728 // Get rid of the enclosing quotes.
1729 Filename = Filename.substr(1, Filename.size() - 2);
1731 // Save the SMLoc, Filename and LineNumber for later use by diagnostics.
1733 CppHashFilename = Filename;
1734 CppHashLineNumber = LineNumber;
1735 CppHashBuf = CurBuffer;
1737 // Ignore any trailing characters, they're just comment.
1742 /// \brief will use the last parsed cpp hash line filename comment
1743 /// for the Filename and LineNo if any in the diagnostic.
1744 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
1745 const AsmParser *Parser = static_cast<const AsmParser *>(Context);
1746 raw_ostream &OS = errs();
1748 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
1749 const SMLoc &DiagLoc = Diag.getLoc();
1750 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1751 unsigned CppHashBuf =
1752 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc);
1754 // Like SourceMgr::printMessage() we need to print the include stack if any
1755 // before printing the message.
1756 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1757 if (!Parser->SavedDiagHandler && DiagCurBuffer &&
1758 DiagCurBuffer != DiagSrcMgr.getMainFileID()) {
1759 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
1760 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
1763 // If we have not parsed a cpp hash line filename comment or the source
1764 // manager changed or buffer changed (like in a nested include) then just
1765 // print the normal diagnostic using its Filename and LineNo.
1766 if (!Parser->CppHashLineNumber || &DiagSrcMgr != &Parser->SrcMgr ||
1767 DiagBuf != CppHashBuf) {
1768 if (Parser->SavedDiagHandler)
1769 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
1771 Diag.print(nullptr, OS);
1775 // Use the CppHashFilename and calculate a line number based on the
1776 // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for
1778 const std::string &Filename = Parser->CppHashFilename;
1780 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
1781 int CppHashLocLineNo =
1782 Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf);
1784 Parser->CppHashLineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
1786 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
1787 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
1788 Diag.getLineContents(), Diag.getRanges());
1790 if (Parser->SavedDiagHandler)
1791 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
1793 NewDiag.print(nullptr, OS);
1796 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
1797 // difference being that that function accepts '@' as part of identifiers and
1798 // we can't do that. AsmLexer.cpp should probably be changed to handle
1799 // '@' as a special case when needed.
1800 static bool isIdentifierChar(char c) {
1801 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
1805 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
1806 ArrayRef<MCAsmMacroParameter> Parameters,
1807 ArrayRef<MCAsmMacroArgument> A,
1808 bool EnableAtPseudoVariable, const SMLoc &L) {
1809 unsigned NParameters = Parameters.size();
1810 bool HasVararg = NParameters ? Parameters.back().Vararg : false;
1811 if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
1812 return Error(L, "Wrong number of arguments");
1814 // A macro without parameters is handled differently on Darwin:
1815 // gas accepts no arguments and does no substitutions
1816 while (!Body.empty()) {
1817 // Scan for the next substitution.
1818 std::size_t End = Body.size(), Pos = 0;
1819 for (; Pos != End; ++Pos) {
1820 // Check for a substitution or escape.
1821 if (IsDarwin && !NParameters) {
1822 // This macro has no parameters, look for $0, $1, etc.
1823 if (Body[Pos] != '$' || Pos + 1 == End)
1826 char Next = Body[Pos + 1];
1827 if (Next == '$' || Next == 'n' ||
1828 isdigit(static_cast<unsigned char>(Next)))
1831 // This macro has parameters, look for \foo, \bar, etc.
1832 if (Body[Pos] == '\\' && Pos + 1 != End)
1838 OS << Body.slice(0, Pos);
1840 // Check if we reached the end.
1844 if (IsDarwin && !NParameters) {
1845 switch (Body[Pos + 1]) {
1851 // $n => number of arguments
1856 // $[0-9] => argument
1858 // Missing arguments are ignored.
1859 unsigned Index = Body[Pos + 1] - '0';
1860 if (Index >= A.size())
1863 // Otherwise substitute with the token values, with spaces eliminated.
1864 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1865 ie = A[Index].end();
1867 OS << it->getString();
1873 unsigned I = Pos + 1;
1875 // Check for the \@ pseudo-variable.
1876 if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End)
1879 while (isIdentifierChar(Body[I]) && I + 1 != End)
1882 const char *Begin = Body.data() + Pos + 1;
1883 StringRef Argument(Begin, I - (Pos + 1));
1886 if (Argument == "@") {
1887 OS << NumOfMacroInstantiations;
1890 for (; Index < NParameters; ++Index)
1891 if (Parameters[Index].Name == Argument)
1894 if (Index == NParameters) {
1895 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
1898 OS << '\\' << Argument;
1902 bool VarargParameter = HasVararg && Index == (NParameters - 1);
1903 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1904 ie = A[Index].end();
1906 // We expect no quotes around the string's contents when
1907 // parsing for varargs.
1908 if (it->getKind() != AsmToken::String || VarargParameter)
1909 OS << it->getString();
1911 OS << it->getStringContents();
1913 Pos += 1 + Argument.size();
1917 // Update the scan point.
1918 Body = Body.substr(Pos);
1924 MacroInstantiation::MacroInstantiation(SMLoc IL, int EB, SMLoc EL,
1925 size_t CondStackDepth)
1926 : InstantiationLoc(IL), ExitBuffer(EB), ExitLoc(EL),
1927 CondStackDepth(CondStackDepth) {}
1929 static bool isOperator(AsmToken::TokenKind kind) {
1933 case AsmToken::Plus:
1934 case AsmToken::Minus:
1935 case AsmToken::Tilde:
1936 case AsmToken::Slash:
1937 case AsmToken::Star:
1939 case AsmToken::Equal:
1940 case AsmToken::EqualEqual:
1941 case AsmToken::Pipe:
1942 case AsmToken::PipePipe:
1943 case AsmToken::Caret:
1945 case AsmToken::AmpAmp:
1946 case AsmToken::Exclaim:
1947 case AsmToken::ExclaimEqual:
1948 case AsmToken::Percent:
1949 case AsmToken::Less:
1950 case AsmToken::LessEqual:
1951 case AsmToken::LessLess:
1952 case AsmToken::LessGreater:
1953 case AsmToken::Greater:
1954 case AsmToken::GreaterEqual:
1955 case AsmToken::GreaterGreater:
1961 class AsmLexerSkipSpaceRAII {
1963 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
1964 Lexer.setSkipSpace(SkipSpace);
1967 ~AsmLexerSkipSpaceRAII() {
1968 Lexer.setSkipSpace(true);
1976 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) {
1979 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1980 StringRef Str = parseStringToEndOfStatement();
1981 MA.emplace_back(AsmToken::String, Str);
1986 unsigned ParenLevel = 0;
1987 unsigned AddTokens = 0;
1989 // Darwin doesn't use spaces to delmit arguments.
1990 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
1993 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
1994 return TokError("unexpected token in macro instantiation");
1996 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma))
1999 if (Lexer.is(AsmToken::Space)) {
2000 Lex(); // Eat spaces
2002 // Spaces can delimit parameters, but could also be part an expression.
2003 // If the token after a space is an operator, add the token and the next
2004 // one into this argument
2006 if (isOperator(Lexer.getKind())) {
2007 // Check to see whether the token is used as an operator,
2008 // or part of an identifier
2009 const char *NextChar = getTok().getEndLoc().getPointer();
2010 if (*NextChar == ' ')
2014 if (!AddTokens && ParenLevel == 0) {
2020 // handleMacroEntry relies on not advancing the lexer here
2021 // to be able to fill in the remaining default parameter values
2022 if (Lexer.is(AsmToken::EndOfStatement))
2025 // Adjust the current parentheses level.
2026 if (Lexer.is(AsmToken::LParen))
2028 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
2031 // Append the token to the current argument list.
2032 MA.push_back(getTok());
2038 if (ParenLevel != 0)
2039 return TokError("unbalanced parentheses in macro argument");
2043 // Parse the macro instantiation arguments.
2044 bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
2045 MCAsmMacroArguments &A) {
2046 const unsigned NParameters = M ? M->Parameters.size() : 0;
2047 bool NamedParametersFound = false;
2048 SmallVector<SMLoc, 4> FALocs;
2050 A.resize(NParameters);
2051 FALocs.resize(NParameters);
2053 // Parse two kinds of macro invocations:
2054 // - macros defined without any parameters accept an arbitrary number of them
2055 // - macros defined with parameters accept at most that many of them
2056 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false;
2057 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
2059 SMLoc IDLoc = Lexer.getLoc();
2060 MCAsmMacroParameter FA;
2062 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) {
2063 if (parseIdentifier(FA.Name)) {
2064 Error(IDLoc, "invalid argument identifier for formal argument");
2065 eatToEndOfStatement();
2069 if (!Lexer.is(AsmToken::Equal)) {
2070 TokError("expected '=' after formal parameter identifier");
2071 eatToEndOfStatement();
2076 NamedParametersFound = true;
2079 if (NamedParametersFound && FA.Name.empty()) {
2080 Error(IDLoc, "cannot mix positional and keyword arguments");
2081 eatToEndOfStatement();
2085 bool Vararg = HasVararg && Parameter == (NParameters - 1);
2086 if (parseMacroArgument(FA.Value, Vararg))
2089 unsigned PI = Parameter;
2090 if (!FA.Name.empty()) {
2092 for (FAI = 0; FAI < NParameters; ++FAI)
2093 if (M->Parameters[FAI].Name == FA.Name)
2096 if (FAI >= NParameters) {
2097 assert(M && "expected macro to be defined");
2099 "parameter named '" + FA.Name + "' does not exist for macro '" +
2106 if (!FA.Value.empty()) {
2111 if (FALocs.size() <= PI)
2112 FALocs.resize(PI + 1);
2114 FALocs[PI] = Lexer.getLoc();
2117 // At the end of the statement, fill in remaining arguments that have
2118 // default values. If there aren't any, then the next argument is
2119 // required but missing
2120 if (Lexer.is(AsmToken::EndOfStatement)) {
2121 bool Failure = false;
2122 for (unsigned FAI = 0; FAI < NParameters; ++FAI) {
2123 if (A[FAI].empty()) {
2124 if (M->Parameters[FAI].Required) {
2125 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(),
2126 "missing value for required parameter "
2127 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'");
2131 if (!M->Parameters[FAI].Value.empty())
2132 A[FAI] = M->Parameters[FAI].Value;
2138 if (Lexer.is(AsmToken::Comma))
2142 return TokError("too many positional arguments");
2145 const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) {
2146 StringMap<MCAsmMacro>::iterator I = MacroMap.find(Name);
2147 return (I == MacroMap.end()) ? nullptr : &I->getValue();
2150 void AsmParser::defineMacro(StringRef Name, MCAsmMacro Macro) {
2151 MacroMap.insert(std::make_pair(Name, std::move(Macro)));
2154 void AsmParser::undefineMacro(StringRef Name) { MacroMap.erase(Name); }
2156 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
2157 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
2158 // this, although we should protect against infinite loops.
2159 if (ActiveMacros.size() == 20)
2160 return TokError("macros cannot be nested more than 20 levels deep");
2162 MCAsmMacroArguments A;
2163 if (parseMacroArguments(M, A))
2166 // Macro instantiation is lexical, unfortunately. We construct a new buffer
2167 // to hold the macro body with substitutions.
2168 SmallString<256> Buf;
2169 StringRef Body = M->Body;
2170 raw_svector_ostream OS(Buf);
2172 if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc()))
2175 // We include the .endmacro in the buffer as our cue to exit the macro
2177 OS << ".endmacro\n";
2179 std::unique_ptr<MemoryBuffer> Instantiation =
2180 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2182 // Create the macro instantiation object and add to the current macro
2183 // instantiation stack.
2184 MacroInstantiation *MI = new MacroInstantiation(
2185 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
2186 ActiveMacros.push_back(MI);
2188 ++NumOfMacroInstantiations;
2190 // Jump to the macro instantiation and prime the lexer.
2191 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
2192 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
2198 void AsmParser::handleMacroExit() {
2199 // Jump to the EndOfStatement we should return to, and consume it.
2200 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2203 // Pop the instantiation entry.
2204 delete ActiveMacros.back();
2205 ActiveMacros.pop_back();
2208 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
2211 const MCExpr *Value;
2212 if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym,
2217 // In the case where we parse an expression starting with a '.', we will
2218 // not generate an error, nor will we create a symbol. In this case we
2219 // should just return out.
2223 // Do the assignment.
2224 Out.EmitAssignment(Sym, Value);
2226 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2231 /// parseIdentifier:
2234 bool AsmParser::parseIdentifier(StringRef &Res) {
2235 // The assembler has relaxed rules for accepting identifiers, in particular we
2236 // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2237 // separate tokens. At this level, we have already lexed so we cannot (currently)
2238 // handle this as a context dependent token, instead we detect adjacent tokens
2239 // and return the combined identifier.
2240 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2241 SMLoc PrefixLoc = getLexer().getLoc();
2243 // Consume the prefix character, and check for a following identifier.
2245 if (Lexer.isNot(AsmToken::Identifier))
2248 // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
2249 if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer())
2252 // Construct the joined identifier and consume the token.
2254 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
2259 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
2262 Res = getTok().getIdentifier();
2264 Lex(); // Consume the identifier token.
2269 /// parseDirectiveSet:
2270 /// ::= .equ identifier ',' expression
2271 /// ::= .equiv identifier ',' expression
2272 /// ::= .set identifier ',' expression
2273 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
2276 if (parseIdentifier(Name))
2277 return TokError("expected identifier after '" + Twine(IDVal) + "'");
2279 if (getLexer().isNot(AsmToken::Comma))
2280 return TokError("unexpected token in '" + Twine(IDVal) + "'");
2283 return parseAssignment(Name, allow_redef, true);
2286 bool AsmParser::parseEscapedString(std::string &Data) {
2287 assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
2290 StringRef Str = getTok().getStringContents();
2291 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2292 if (Str[i] != '\\') {
2297 // Recognize escaped characters. Note that this escape semantics currently
2298 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2301 return TokError("unexpected backslash at end of string");
2303 // Recognize octal sequences.
2304 if ((unsigned)(Str[i] - '0') <= 7) {
2305 // Consume up to three octal characters.
2306 unsigned Value = Str[i] - '0';
2308 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2310 Value = Value * 8 + (Str[i] - '0');
2312 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2314 Value = Value * 8 + (Str[i] - '0');
2319 return TokError("invalid octal escape sequence (out of range)");
2321 Data += (unsigned char)Value;
2325 // Otherwise recognize individual escapes.
2328 // Just reject invalid escape sequences for now.
2329 return TokError("invalid escape sequence (unrecognized character)");
2331 case 'b': Data += '\b'; break;
2332 case 'f': Data += '\f'; break;
2333 case 'n': Data += '\n'; break;
2334 case 'r': Data += '\r'; break;
2335 case 't': Data += '\t'; break;
2336 case '"': Data += '"'; break;
2337 case '\\': Data += '\\'; break;
2344 /// parseDirectiveAscii:
2345 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2346 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2347 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2348 checkForValidSection();
2351 if (getLexer().isNot(AsmToken::String))
2352 return TokError("expected string in '" + Twine(IDVal) + "' directive");
2355 if (parseEscapedString(Data))
2358 getStreamer().EmitBytes(Data);
2360 getStreamer().EmitBytes(StringRef("\0", 1));
2364 if (getLexer().is(AsmToken::EndOfStatement))
2367 if (getLexer().isNot(AsmToken::Comma))
2368 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
2377 /// parseDirectiveValue
2378 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
2379 bool AsmParser::parseDirectiveValue(unsigned Size) {
2380 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2381 checkForValidSection();
2384 const MCExpr *Value;
2385 SMLoc ExprLoc = getLexer().getLoc();
2386 if (parseExpression(Value))
2389 // Special case constant expressions to match code generator.
2390 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2391 assert(Size <= 8 && "Invalid size");
2392 uint64_t IntValue = MCE->getValue();
2393 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
2394 return Error(ExprLoc, "literal value out of range for directive");
2395 getStreamer().EmitIntValue(IntValue, Size);
2397 getStreamer().EmitValue(Value, Size, ExprLoc);
2399 if (getLexer().is(AsmToken::EndOfStatement))
2402 // FIXME: Improve diagnostic.
2403 if (getLexer().isNot(AsmToken::Comma))
2404 return TokError("unexpected token in directive");
2413 /// ParseDirectiveOctaValue
2414 /// ::= .octa [ hexconstant (, hexconstant)* ]
2415 bool AsmParser::parseDirectiveOctaValue() {
2416 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2417 checkForValidSection();
2420 if (Lexer.getKind() == AsmToken::Error)
2422 if (Lexer.getKind() != AsmToken::Integer &&
2423 Lexer.getKind() != AsmToken::BigNum)
2424 return TokError("unknown token in expression");
2426 SMLoc ExprLoc = getLexer().getLoc();
2427 APInt IntValue = getTok().getAPIntVal();
2431 if (IntValue.isIntN(64)) {
2433 lo = IntValue.getZExtValue();
2434 } else if (IntValue.isIntN(128)) {
2435 // It might actually have more than 128 bits, but the top ones are zero.
2436 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue();
2437 lo = IntValue.getLoBits(64).getZExtValue();
2439 return Error(ExprLoc, "literal value out of range for directive");
2441 if (MAI.isLittleEndian()) {
2442 getStreamer().EmitIntValue(lo, 8);
2443 getStreamer().EmitIntValue(hi, 8);
2445 getStreamer().EmitIntValue(hi, 8);
2446 getStreamer().EmitIntValue(lo, 8);
2449 if (getLexer().is(AsmToken::EndOfStatement))
2452 // FIXME: Improve diagnostic.
2453 if (getLexer().isNot(AsmToken::Comma))
2454 return TokError("unexpected token in directive");
2463 /// parseDirectiveRealValue
2464 /// ::= (.single | .double) [ expression (, expression)* ]
2465 bool AsmParser::parseDirectiveRealValue(const fltSemantics &Semantics) {
2466 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2467 checkForValidSection();
2470 // We don't truly support arithmetic on floating point expressions, so we
2471 // have to manually parse unary prefixes.
2473 if (getLexer().is(AsmToken::Minus)) {
2476 } else if (getLexer().is(AsmToken::Plus))
2479 if (getLexer().isNot(AsmToken::Integer) &&
2480 getLexer().isNot(AsmToken::Real) &&
2481 getLexer().isNot(AsmToken::Identifier))
2482 return TokError("unexpected token in directive");
2484 // Convert to an APFloat.
2485 APFloat Value(Semantics);
2486 StringRef IDVal = getTok().getString();
2487 if (getLexer().is(AsmToken::Identifier)) {
2488 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
2489 Value = APFloat::getInf(Semantics);
2490 else if (!IDVal.compare_lower("nan"))
2491 Value = APFloat::getNaN(Semantics, false, ~0);
2493 return TokError("invalid floating point literal");
2494 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
2495 APFloat::opInvalidOp)
2496 return TokError("invalid floating point literal");
2500 // Consume the numeric token.
2503 // Emit the value as an integer.
2504 APInt AsInt = Value.bitcastToAPInt();
2505 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
2506 AsInt.getBitWidth() / 8);
2508 if (getLexer().is(AsmToken::EndOfStatement))
2511 if (getLexer().isNot(AsmToken::Comma))
2512 return TokError("unexpected token in directive");
2521 /// parseDirectiveZero
2522 /// ::= .zero expression
2523 bool AsmParser::parseDirectiveZero() {
2524 checkForValidSection();
2527 if (parseAbsoluteExpression(NumBytes))
2531 if (getLexer().is(AsmToken::Comma)) {
2533 if (parseAbsoluteExpression(Val))
2537 if (getLexer().isNot(AsmToken::EndOfStatement))
2538 return TokError("unexpected token in '.zero' directive");
2542 getStreamer().EmitFill(NumBytes, Val);
2547 /// parseDirectiveFill
2548 /// ::= .fill expression [ , expression [ , expression ] ]
2549 bool AsmParser::parseDirectiveFill() {
2550 checkForValidSection();
2552 SMLoc RepeatLoc = getLexer().getLoc();
2554 if (parseAbsoluteExpression(NumValues))
2557 if (NumValues < 0) {
2559 "'.fill' directive with negative repeat count has no effect");
2563 int64_t FillSize = 1;
2564 int64_t FillExpr = 0;
2566 SMLoc SizeLoc, ExprLoc;
2567 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2568 if (getLexer().isNot(AsmToken::Comma))
2569 return TokError("unexpected token in '.fill' directive");
2572 SizeLoc = getLexer().getLoc();
2573 if (parseAbsoluteExpression(FillSize))
2576 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2577 if (getLexer().isNot(AsmToken::Comma))
2578 return TokError("unexpected token in '.fill' directive");
2581 ExprLoc = getLexer().getLoc();
2582 if (parseAbsoluteExpression(FillExpr))
2585 if (getLexer().isNot(AsmToken::EndOfStatement))
2586 return TokError("unexpected token in '.fill' directive");
2593 Warning(SizeLoc, "'.fill' directive with negative size has no effect");
2597 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
2601 if (!isUInt<32>(FillExpr) && FillSize > 4)
2602 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");
2604 if (NumValues > 0) {
2605 int64_t NonZeroFillSize = FillSize > 4 ? 4 : FillSize;
2606 FillExpr &= ~0ULL >> (64 - NonZeroFillSize * 8);
2607 for (uint64_t i = 0, e = NumValues; i != e; ++i) {
2608 getStreamer().EmitIntValue(FillExpr, NonZeroFillSize);
2609 if (NonZeroFillSize < FillSize)
2610 getStreamer().EmitIntValue(0, FillSize - NonZeroFillSize);
2617 /// parseDirectiveOrg
2618 /// ::= .org expression [ , expression ]
2619 bool AsmParser::parseDirectiveOrg() {
2620 checkForValidSection();
2622 const MCExpr *Offset;
2623 SMLoc Loc = getTok().getLoc();
2624 if (parseExpression(Offset))
2627 // Parse optional fill expression.
2628 int64_t FillExpr = 0;
2629 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2630 if (getLexer().isNot(AsmToken::Comma))
2631 return TokError("unexpected token in '.org' directive");
2634 if (parseAbsoluteExpression(FillExpr))
2637 if (getLexer().isNot(AsmToken::EndOfStatement))
2638 return TokError("unexpected token in '.org' directive");
2643 // Only limited forms of relocatable expressions are accepted here, it
2644 // has to be relative to the current section. The streamer will return
2645 // 'true' if the expression wasn't evaluatable.
2646 if (getStreamer().EmitValueToOffset(Offset, FillExpr))
2647 return Error(Loc, "expected assembly-time absolute expression");
2652 /// parseDirectiveAlign
2653 /// ::= {.align, ...} expression [ , expression [ , expression ]]
2654 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
2655 checkForValidSection();
2657 SMLoc AlignmentLoc = getLexer().getLoc();
2659 if (parseAbsoluteExpression(Alignment))
2663 bool HasFillExpr = false;
2664 int64_t FillExpr = 0;
2665 int64_t MaxBytesToFill = 0;
2666 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2667 if (getLexer().isNot(AsmToken::Comma))
2668 return TokError("unexpected token in directive");
2671 // The fill expression can be omitted while specifying a maximum number of
2672 // alignment bytes, e.g:
2674 if (getLexer().isNot(AsmToken::Comma)) {
2676 if (parseAbsoluteExpression(FillExpr))
2680 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2681 if (getLexer().isNot(AsmToken::Comma))
2682 return TokError("unexpected token in directive");
2685 MaxBytesLoc = getLexer().getLoc();
2686 if (parseAbsoluteExpression(MaxBytesToFill))
2689 if (getLexer().isNot(AsmToken::EndOfStatement))
2690 return TokError("unexpected token in directive");
2699 // Compute alignment in bytes.
2701 // FIXME: Diagnose overflow.
2702 if (Alignment >= 32) {
2703 Error(AlignmentLoc, "invalid alignment value");
2707 Alignment = 1ULL << Alignment;
2709 // Reject alignments that aren't either a power of two or zero,
2710 // for gas compatibility. Alignment of zero is silently rounded
2714 if (!isPowerOf2_64(Alignment))
2715 Error(AlignmentLoc, "alignment must be a power of 2");
2718 // Diagnose non-sensical max bytes to align.
2719 if (MaxBytesLoc.isValid()) {
2720 if (MaxBytesToFill < 1) {
2721 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
2722 "many bytes, ignoring maximum bytes expression");
2726 if (MaxBytesToFill >= Alignment) {
2727 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
2733 // Check whether we should use optimal code alignment for this .align
2735 const MCSection *Section = getStreamer().getCurrentSection().first;
2736 assert(Section && "must have section to emit alignment");
2737 bool UseCodeAlign = Section->UseCodeAlign();
2738 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
2739 ValueSize == 1 && UseCodeAlign) {
2740 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
2742 // FIXME: Target specific behavior about how the "extra" bytes are filled.
2743 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
2750 /// parseDirectiveFile
2751 /// ::= .file [number] filename
2752 /// ::= .file number directory filename
2753 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
2754 // FIXME: I'm not sure what this is.
2755 int64_t FileNumber = -1;
2756 SMLoc FileNumberLoc = getLexer().getLoc();
2757 if (getLexer().is(AsmToken::Integer)) {
2758 FileNumber = getTok().getIntVal();
2762 return TokError("file number less than one");
2765 if (getLexer().isNot(AsmToken::String))
2766 return TokError("unexpected token in '.file' directive");
2768 // Usually the directory and filename together, otherwise just the directory.
2769 // Allow the strings to have escaped octal character sequence.
2770 std::string Path = getTok().getString();
2771 if (parseEscapedString(Path))
2775 StringRef Directory;
2777 std::string FilenameData;
2778 if (getLexer().is(AsmToken::String)) {
2779 if (FileNumber == -1)
2780 return TokError("explicit path specified, but no file number");
2781 if (parseEscapedString(FilenameData))
2783 Filename = FilenameData;
2790 if (getLexer().isNot(AsmToken::EndOfStatement))
2791 return TokError("unexpected token in '.file' directive");
2793 if (FileNumber == -1)
2794 getStreamer().EmitFileDirective(Filename);
2796 if (getContext().getGenDwarfForAssembly())
2798 "input can't have .file dwarf directives when -g is "
2799 "used to generate dwarf debug info for assembly code");
2801 if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename) ==
2803 Error(FileNumberLoc, "file number already allocated");
2809 /// parseDirectiveLine
2810 /// ::= .line [number]
2811 bool AsmParser::parseDirectiveLine() {
2812 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2813 if (getLexer().isNot(AsmToken::Integer))
2814 return TokError("unexpected token in '.line' directive");
2816 int64_t LineNumber = getTok().getIntVal();
2820 // FIXME: Do something with the .line.
2823 if (getLexer().isNot(AsmToken::EndOfStatement))
2824 return TokError("unexpected token in '.line' directive");
2829 /// parseDirectiveLoc
2830 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
2831 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
2832 /// The first number is a file number, must have been previously assigned with
2833 /// a .file directive, the second number is the line number and optionally the
2834 /// third number is a column position (zero if not specified). The remaining
2835 /// optional items are .loc sub-directives.
2836 bool AsmParser::parseDirectiveLoc() {
2837 if (getLexer().isNot(AsmToken::Integer))
2838 return TokError("unexpected token in '.loc' directive");
2839 int64_t FileNumber = getTok().getIntVal();
2841 return TokError("file number less than one in '.loc' directive");
2842 if (!getContext().isValidDwarfFileNumber(FileNumber))
2843 return TokError("unassigned file number in '.loc' directive");
2846 int64_t LineNumber = 0;
2847 if (getLexer().is(AsmToken::Integer)) {
2848 LineNumber = getTok().getIntVal();
2850 return TokError("line number less than zero in '.loc' directive");
2854 int64_t ColumnPos = 0;
2855 if (getLexer().is(AsmToken::Integer)) {
2856 ColumnPos = getTok().getIntVal();
2858 return TokError("column position less than zero in '.loc' directive");
2862 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
2864 int64_t Discriminator = 0;
2865 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2867 if (getLexer().is(AsmToken::EndOfStatement))
2871 SMLoc Loc = getTok().getLoc();
2872 if (parseIdentifier(Name))
2873 return TokError("unexpected token in '.loc' directive");
2875 if (Name == "basic_block")
2876 Flags |= DWARF2_FLAG_BASIC_BLOCK;
2877 else if (Name == "prologue_end")
2878 Flags |= DWARF2_FLAG_PROLOGUE_END;
2879 else if (Name == "epilogue_begin")
2880 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
2881 else if (Name == "is_stmt") {
2882 Loc = getTok().getLoc();
2883 const MCExpr *Value;
2884 if (parseExpression(Value))
2886 // The expression must be the constant 0 or 1.
2887 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2888 int Value = MCE->getValue();
2890 Flags &= ~DWARF2_FLAG_IS_STMT;
2891 else if (Value == 1)
2892 Flags |= DWARF2_FLAG_IS_STMT;
2894 return Error(Loc, "is_stmt value not 0 or 1");
2896 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
2898 } else if (Name == "isa") {
2899 Loc = getTok().getLoc();
2900 const MCExpr *Value;
2901 if (parseExpression(Value))
2903 // The expression must be a constant greater or equal to 0.
2904 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2905 int Value = MCE->getValue();
2907 return Error(Loc, "isa number less than zero");
2910 return Error(Loc, "isa number not a constant value");
2912 } else if (Name == "discriminator") {
2913 if (parseAbsoluteExpression(Discriminator))
2916 return Error(Loc, "unknown sub-directive in '.loc' directive");
2919 if (getLexer().is(AsmToken::EndOfStatement))
2924 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
2925 Isa, Discriminator, StringRef());
2930 /// parseDirectiveStabs
2931 /// ::= .stabs string, number, number, number
2932 bool AsmParser::parseDirectiveStabs() {
2933 return TokError("unsupported directive '.stabs'");
2936 /// parseDirectiveCFISections
2937 /// ::= .cfi_sections section [, section]
2938 bool AsmParser::parseDirectiveCFISections() {
2943 if (parseIdentifier(Name))
2944 return TokError("Expected an identifier");
2946 if (Name == ".eh_frame")
2948 else if (Name == ".debug_frame")
2951 if (getLexer().is(AsmToken::Comma)) {
2954 if (parseIdentifier(Name))
2955 return TokError("Expected an identifier");
2957 if (Name == ".eh_frame")
2959 else if (Name == ".debug_frame")
2963 getStreamer().EmitCFISections(EH, Debug);
2967 /// parseDirectiveCFIStartProc
2968 /// ::= .cfi_startproc [simple]
2969 bool AsmParser::parseDirectiveCFIStartProc() {
2971 if (getLexer().isNot(AsmToken::EndOfStatement))
2972 if (parseIdentifier(Simple) || Simple != "simple")
2973 return TokError("unexpected token in .cfi_startproc directive");
2975 getStreamer().EmitCFIStartProc(!Simple.empty());
2979 /// parseDirectiveCFIEndProc
2980 /// ::= .cfi_endproc
2981 bool AsmParser::parseDirectiveCFIEndProc() {
2982 getStreamer().EmitCFIEndProc();
2986 /// \brief parse register name or number.
2987 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
2988 SMLoc DirectiveLoc) {
2991 if (getLexer().isNot(AsmToken::Integer)) {
2992 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
2994 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
2996 return parseAbsoluteExpression(Register);
3001 /// parseDirectiveCFIDefCfa
3002 /// ::= .cfi_def_cfa register, offset
3003 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
3004 int64_t Register = 0;
3005 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3008 if (getLexer().isNot(AsmToken::Comma))
3009 return TokError("unexpected token in directive");
3013 if (parseAbsoluteExpression(Offset))
3016 getStreamer().EmitCFIDefCfa(Register, Offset);
3020 /// parseDirectiveCFIDefCfaOffset
3021 /// ::= .cfi_def_cfa_offset offset
3022 bool AsmParser::parseDirectiveCFIDefCfaOffset() {
3024 if (parseAbsoluteExpression(Offset))
3027 getStreamer().EmitCFIDefCfaOffset(Offset);
3031 /// parseDirectiveCFIRegister
3032 /// ::= .cfi_register register, register
3033 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
3034 int64_t Register1 = 0;
3035 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc))
3038 if (getLexer().isNot(AsmToken::Comma))
3039 return TokError("unexpected token in directive");
3042 int64_t Register2 = 0;
3043 if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc))
3046 getStreamer().EmitCFIRegister(Register1, Register2);
3050 /// parseDirectiveCFIWindowSave
3051 /// ::= .cfi_window_save
3052 bool AsmParser::parseDirectiveCFIWindowSave() {
3053 getStreamer().EmitCFIWindowSave();
3057 /// parseDirectiveCFIAdjustCfaOffset
3058 /// ::= .cfi_adjust_cfa_offset adjustment
3059 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
3060 int64_t Adjustment = 0;
3061 if (parseAbsoluteExpression(Adjustment))
3064 getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
3068 /// parseDirectiveCFIDefCfaRegister
3069 /// ::= .cfi_def_cfa_register register
3070 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
3071 int64_t Register = 0;
3072 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3075 getStreamer().EmitCFIDefCfaRegister(Register);
3079 /// parseDirectiveCFIOffset
3080 /// ::= .cfi_offset register, offset
3081 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
3082 int64_t Register = 0;
3085 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3088 if (getLexer().isNot(AsmToken::Comma))
3089 return TokError("unexpected token in directive");
3092 if (parseAbsoluteExpression(Offset))
3095 getStreamer().EmitCFIOffset(Register, Offset);
3099 /// parseDirectiveCFIRelOffset
3100 /// ::= .cfi_rel_offset register, offset
3101 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
3102 int64_t Register = 0;
3104 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3107 if (getLexer().isNot(AsmToken::Comma))
3108 return TokError("unexpected token in directive");
3112 if (parseAbsoluteExpression(Offset))
3115 getStreamer().EmitCFIRelOffset(Register, Offset);
3119 static bool isValidEncoding(int64_t Encoding) {
3120 if (Encoding & ~0xff)
3123 if (Encoding == dwarf::DW_EH_PE_omit)
3126 const unsigned Format = Encoding & 0xf;
3127 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
3128 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
3129 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
3130 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
3133 const unsigned Application = Encoding & 0x70;
3134 if (Application != dwarf::DW_EH_PE_absptr &&
3135 Application != dwarf::DW_EH_PE_pcrel)
3141 /// parseDirectiveCFIPersonalityOrLsda
3142 /// IsPersonality true for cfi_personality, false for cfi_lsda
3143 /// ::= .cfi_personality encoding, [symbol_name]
3144 /// ::= .cfi_lsda encoding, [symbol_name]
3145 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
3146 int64_t Encoding = 0;
3147 if (parseAbsoluteExpression(Encoding))
3149 if (Encoding == dwarf::DW_EH_PE_omit)
3152 if (!isValidEncoding(Encoding))
3153 return TokError("unsupported encoding.");
3155 if (getLexer().isNot(AsmToken::Comma))
3156 return TokError("unexpected token in directive");
3160 if (parseIdentifier(Name))
3161 return TokError("expected identifier in directive");
3163 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
3166 getStreamer().EmitCFIPersonality(Sym, Encoding);
3168 getStreamer().EmitCFILsda(Sym, Encoding);
3172 /// parseDirectiveCFIRememberState
3173 /// ::= .cfi_remember_state
3174 bool AsmParser::parseDirectiveCFIRememberState() {
3175 getStreamer().EmitCFIRememberState();
3179 /// parseDirectiveCFIRestoreState
3180 /// ::= .cfi_remember_state
3181 bool AsmParser::parseDirectiveCFIRestoreState() {
3182 getStreamer().EmitCFIRestoreState();
3186 /// parseDirectiveCFISameValue
3187 /// ::= .cfi_same_value register
3188 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
3189 int64_t Register = 0;
3191 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3194 getStreamer().EmitCFISameValue(Register);
3198 /// parseDirectiveCFIRestore
3199 /// ::= .cfi_restore register
3200 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
3201 int64_t Register = 0;
3202 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3205 getStreamer().EmitCFIRestore(Register);
3209 /// parseDirectiveCFIEscape
3210 /// ::= .cfi_escape expression[,...]
3211 bool AsmParser::parseDirectiveCFIEscape() {
3214 if (parseAbsoluteExpression(CurrValue))
3217 Values.push_back((uint8_t)CurrValue);
3219 while (getLexer().is(AsmToken::Comma)) {
3222 if (parseAbsoluteExpression(CurrValue))
3225 Values.push_back((uint8_t)CurrValue);
3228 getStreamer().EmitCFIEscape(Values);
3232 /// parseDirectiveCFISignalFrame
3233 /// ::= .cfi_signal_frame
3234 bool AsmParser::parseDirectiveCFISignalFrame() {
3235 if (getLexer().isNot(AsmToken::EndOfStatement))
3236 return Error(getLexer().getLoc(),
3237 "unexpected token in '.cfi_signal_frame'");
3239 getStreamer().EmitCFISignalFrame();
3243 /// parseDirectiveCFIUndefined
3244 /// ::= .cfi_undefined register
3245 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
3246 int64_t Register = 0;
3248 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3251 getStreamer().EmitCFIUndefined(Register);
3255 /// parseDirectiveMacrosOnOff
3258 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
3259 if (getLexer().isNot(AsmToken::EndOfStatement))
3260 return Error(getLexer().getLoc(),
3261 "unexpected token in '" + Directive + "' directive");
3263 setMacrosEnabled(Directive == ".macros_on");
3267 /// parseDirectiveMacro
3268 /// ::= .macro name[,] [parameters]
3269 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
3271 if (parseIdentifier(Name))
3272 return TokError("expected identifier in '.macro' directive");
3274 if (getLexer().is(AsmToken::Comma))
3277 MCAsmMacroParameters Parameters;
3278 while (getLexer().isNot(AsmToken::EndOfStatement)) {
3280 if (!Parameters.empty() && Parameters.back().Vararg)
3281 return Error(Lexer.getLoc(),
3282 "Vararg parameter '" + Parameters.back().Name +
3283 "' should be last one in the list of parameters.");
3285 MCAsmMacroParameter Parameter;
3286 if (parseIdentifier(Parameter.Name))
3287 return TokError("expected identifier in '.macro' directive");
3289 if (Lexer.is(AsmToken::Colon)) {
3290 Lex(); // consume ':'
3293 StringRef Qualifier;
3295 QualLoc = Lexer.getLoc();
3296 if (parseIdentifier(Qualifier))
3297 return Error(QualLoc, "missing parameter qualifier for "
3298 "'" + Parameter.Name + "' in macro '" + Name + "'");
3300 if (Qualifier == "req")
3301 Parameter.Required = true;
3302 else if (Qualifier == "vararg")
3303 Parameter.Vararg = true;
3305 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier "
3306 "for '" + Parameter.Name + "' in macro '" + Name + "'");
3309 if (getLexer().is(AsmToken::Equal)) {
3314 ParamLoc = Lexer.getLoc();
3315 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false ))
3318 if (Parameter.Required)
3319 Warning(ParamLoc, "pointless default value for required parameter "
3320 "'" + Parameter.Name + "' in macro '" + Name + "'");
3323 Parameters.push_back(std::move(Parameter));
3325 if (getLexer().is(AsmToken::Comma))
3329 // Eat the end of statement.
3332 AsmToken EndToken, StartToken = getTok();
3333 unsigned MacroDepth = 0;
3335 // Lex the macro definition.
3337 // Check whether we have reached the end of the file.
3338 if (getLexer().is(AsmToken::Eof))
3339 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
3341 // Otherwise, check whether we have reach the .endmacro.
3342 if (getLexer().is(AsmToken::Identifier)) {
3343 if (getTok().getIdentifier() == ".endm" ||
3344 getTok().getIdentifier() == ".endmacro") {
3345 if (MacroDepth == 0) { // Outermost macro.
3346 EndToken = getTok();
3348 if (getLexer().isNot(AsmToken::EndOfStatement))
3349 return TokError("unexpected token in '" + EndToken.getIdentifier() +
3353 // Otherwise we just found the end of an inner macro.
3356 } else if (getTok().getIdentifier() == ".macro") {
3357 // We allow nested macros. Those aren't instantiated until the outermost
3358 // macro is expanded so just ignore them for now.
3363 // Otherwise, scan til the end of the statement.
3364 eatToEndOfStatement();
3367 if (lookupMacro(Name)) {
3368 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
3371 const char *BodyStart = StartToken.getLoc().getPointer();
3372 const char *BodyEnd = EndToken.getLoc().getPointer();
3373 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3374 checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
3375 defineMacro(Name, MCAsmMacro(Name, Body, std::move(Parameters)));
3379 /// checkForBadMacro
3381 /// With the support added for named parameters there may be code out there that
3382 /// is transitioning from positional parameters. In versions of gas that did
3383 /// not support named parameters they would be ignored on the macro definition.
3384 /// But to support both styles of parameters this is not possible so if a macro
3385 /// definition has named parameters but does not use them and has what appears
3386 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
3387 /// warning that the positional parameter found in body which have no effect.
3388 /// Hoping the developer will either remove the named parameters from the macro
3389 /// definition so the positional parameters get used if that was what was
3390 /// intended or change the macro to use the named parameters. It is possible
3391 /// this warning will trigger when the none of the named parameters are used
3392 /// and the strings like $1 are infact to simply to be passed trough unchanged.
3393 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
3395 ArrayRef<MCAsmMacroParameter> Parameters) {
3396 // If this macro is not defined with named parameters the warning we are
3397 // checking for here doesn't apply.
3398 unsigned NParameters = Parameters.size();
3399 if (NParameters == 0)
3402 bool NamedParametersFound = false;
3403 bool PositionalParametersFound = false;
3405 // Look at the body of the macro for use of both the named parameters and what
3406 // are likely to be positional parameters. This is what expandMacro() is
3407 // doing when it finds the parameters in the body.
3408 while (!Body.empty()) {
3409 // Scan for the next possible parameter.
3410 std::size_t End = Body.size(), Pos = 0;
3411 for (; Pos != End; ++Pos) {
3412 // Check for a substitution or escape.
3413 // This macro is defined with parameters, look for \foo, \bar, etc.
3414 if (Body[Pos] == '\\' && Pos + 1 != End)
3417 // This macro should have parameters, but look for $0, $1, ..., $n too.
3418 if (Body[Pos] != '$' || Pos + 1 == End)
3420 char Next = Body[Pos + 1];
3421 if (Next == '$' || Next == 'n' ||
3422 isdigit(static_cast<unsigned char>(Next)))
3426 // Check if we reached the end.
3430 if (Body[Pos] == '$') {
3431 switch (Body[Pos + 1]) {
3436 // $n => number of arguments
3438 PositionalParametersFound = true;
3441 // $[0-9] => argument
3443 PositionalParametersFound = true;
3449 unsigned I = Pos + 1;
3450 while (isIdentifierChar(Body[I]) && I + 1 != End)
3453 const char *Begin = Body.data() + Pos + 1;
3454 StringRef Argument(Begin, I - (Pos + 1));
3456 for (; Index < NParameters; ++Index)
3457 if (Parameters[Index].Name == Argument)
3460 if (Index == NParameters) {
3461 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
3467 NamedParametersFound = true;
3468 Pos += 1 + Argument.size();
3471 // Update the scan point.
3472 Body = Body.substr(Pos);
3475 if (!NamedParametersFound && PositionalParametersFound)
3476 Warning(DirectiveLoc, "macro defined with named parameters which are not "
3477 "used in macro body, possible positional parameter "
3478 "found in body which will have no effect");
3481 /// parseDirectiveExitMacro
3483 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) {
3484 if (getLexer().isNot(AsmToken::EndOfStatement))
3485 return TokError("unexpected token in '" + Directive + "' directive");
3487 if (!isInsideMacroInstantiation())
3488 return TokError("unexpected '" + Directive + "' in file, "
3489 "no current macro definition");
3491 // Exit all conditionals that are active in the current macro.
3492 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) {
3493 TheCondState = TheCondStack.back();
3494 TheCondStack.pop_back();
3501 /// parseDirectiveEndMacro
3504 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
3505 if (getLexer().isNot(AsmToken::EndOfStatement))
3506 return TokError("unexpected token in '" + Directive + "' directive");
3508 // If we are inside a macro instantiation, terminate the current
3510 if (isInsideMacroInstantiation()) {
3515 // Otherwise, this .endmacro is a stray entry in the file; well formed
3516 // .endmacro directives are handled during the macro definition parsing.
3517 return TokError("unexpected '" + Directive + "' in file, "
3518 "no current macro definition");
3521 /// parseDirectivePurgeMacro
3523 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
3525 if (parseIdentifier(Name))
3526 return TokError("expected identifier in '.purgem' directive");
3528 if (getLexer().isNot(AsmToken::EndOfStatement))
3529 return TokError("unexpected token in '.purgem' directive");
3531 if (!lookupMacro(Name))
3532 return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
3534 undefineMacro(Name);
3538 /// parseDirectiveBundleAlignMode
3539 /// ::= {.bundle_align_mode} expression
3540 bool AsmParser::parseDirectiveBundleAlignMode() {
3541 checkForValidSection();
3543 // Expect a single argument: an expression that evaluates to a constant
3544 // in the inclusive range 0-30.
3545 SMLoc ExprLoc = getLexer().getLoc();
3546 int64_t AlignSizePow2;
3547 if (parseAbsoluteExpression(AlignSizePow2))
3549 else if (getLexer().isNot(AsmToken::EndOfStatement))
3550 return TokError("unexpected token after expression in"
3551 " '.bundle_align_mode' directive");
3552 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30)
3553 return Error(ExprLoc,
3554 "invalid bundle alignment size (expected between 0 and 30)");
3558 // Because of AlignSizePow2's verified range we can safely truncate it to
3560 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
3564 /// parseDirectiveBundleLock
3565 /// ::= {.bundle_lock} [align_to_end]
3566 bool AsmParser::parseDirectiveBundleLock() {
3567 checkForValidSection();
3568 bool AlignToEnd = false;
3570 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3572 SMLoc Loc = getTok().getLoc();
3573 const char *kInvalidOptionError =
3574 "invalid option for '.bundle_lock' directive";
3576 if (parseIdentifier(Option))
3577 return Error(Loc, kInvalidOptionError);
3579 if (Option != "align_to_end")
3580 return Error(Loc, kInvalidOptionError);
3581 else if (getLexer().isNot(AsmToken::EndOfStatement))
3583 "unexpected token after '.bundle_lock' directive option");
3589 getStreamer().EmitBundleLock(AlignToEnd);
3593 /// parseDirectiveBundleLock
3594 /// ::= {.bundle_lock}
3595 bool AsmParser::parseDirectiveBundleUnlock() {
3596 checkForValidSection();
3598 if (getLexer().isNot(AsmToken::EndOfStatement))
3599 return TokError("unexpected token in '.bundle_unlock' directive");
3602 getStreamer().EmitBundleUnlock();
3606 /// parseDirectiveSpace
3607 /// ::= (.skip | .space) expression [ , expression ]
3608 bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
3609 checkForValidSection();
3612 if (parseAbsoluteExpression(NumBytes))
3615 int64_t FillExpr = 0;
3616 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3617 if (getLexer().isNot(AsmToken::Comma))
3618 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3621 if (parseAbsoluteExpression(FillExpr))
3624 if (getLexer().isNot(AsmToken::EndOfStatement))
3625 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3631 return TokError("invalid number of bytes in '" + Twine(IDVal) +
3634 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
3635 getStreamer().EmitFill(NumBytes, FillExpr);
3640 /// parseDirectiveLEB128
3641 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ]
3642 bool AsmParser::parseDirectiveLEB128(bool Signed) {
3643 checkForValidSection();
3644 const MCExpr *Value;
3647 if (parseExpression(Value))
3651 getStreamer().EmitSLEB128Value(Value);
3653 getStreamer().EmitULEB128Value(Value);
3655 if (getLexer().is(AsmToken::EndOfStatement))
3658 if (getLexer().isNot(AsmToken::Comma))
3659 return TokError("unexpected token in directive");
3666 /// parseDirectiveSymbolAttribute
3667 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
3668 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
3669 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3672 SMLoc Loc = getTok().getLoc();
3674 if (parseIdentifier(Name))
3675 return Error(Loc, "expected identifier in directive");
3677 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
3679 // Assembler local symbols don't make any sense here. Complain loudly.
3680 if (Sym->isTemporary())
3681 return Error(Loc, "non-local symbol required in directive");
3683 if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
3684 return Error(Loc, "unable to emit symbol attribute");
3686 if (getLexer().is(AsmToken::EndOfStatement))
3689 if (getLexer().isNot(AsmToken::Comma))
3690 return TokError("unexpected token in directive");
3699 /// parseDirectiveComm
3700 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
3701 bool AsmParser::parseDirectiveComm(bool IsLocal) {
3702 checkForValidSection();
3704 SMLoc IDLoc = getLexer().getLoc();
3706 if (parseIdentifier(Name))
3707 return TokError("expected identifier in directive");
3709 // Handle the identifier as the key symbol.
3710 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
3712 if (getLexer().isNot(AsmToken::Comma))
3713 return TokError("unexpected token in directive");
3717 SMLoc SizeLoc = getLexer().getLoc();
3718 if (parseAbsoluteExpression(Size))
3721 int64_t Pow2Alignment = 0;
3722 SMLoc Pow2AlignmentLoc;
3723 if (getLexer().is(AsmToken::Comma)) {
3725 Pow2AlignmentLoc = getLexer().getLoc();
3726 if (parseAbsoluteExpression(Pow2Alignment))
3729 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
3730 if (IsLocal && LCOMM == LCOMM::NoAlignment)
3731 return Error(Pow2AlignmentLoc, "alignment not supported on this target");
3733 // If this target takes alignments in bytes (not log) validate and convert.
3734 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
3735 (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
3736 if (!isPowerOf2_64(Pow2Alignment))
3737 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
3738 Pow2Alignment = Log2_64(Pow2Alignment);
3742 if (getLexer().isNot(AsmToken::EndOfStatement))
3743 return TokError("unexpected token in '.comm' or '.lcomm' directive");
3747 // NOTE: a size of zero for a .comm should create a undefined symbol
3748 // but a size of .lcomm creates a bss symbol of size zero.
3750 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
3751 "be less than zero");
3753 // NOTE: The alignment in the directive is a power of 2 value, the assembler
3754 // may internally end up wanting an alignment in bytes.
3755 // FIXME: Diagnose overflow.
3756 if (Pow2Alignment < 0)
3757 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
3758 "alignment, can't be less than zero");
3760 if (!Sym->isUndefined())
3761 return Error(IDLoc, "invalid symbol redefinition");
3763 // Create the Symbol as a common or local common with Size and Pow2Alignment
3765 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3769 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3773 /// parseDirectiveAbort
3774 /// ::= .abort [... message ...]
3775 bool AsmParser::parseDirectiveAbort() {
3776 // FIXME: Use loc from directive.
3777 SMLoc Loc = getLexer().getLoc();
3779 StringRef Str = parseStringToEndOfStatement();
3780 if (getLexer().isNot(AsmToken::EndOfStatement))
3781 return TokError("unexpected token in '.abort' directive");
3786 Error(Loc, ".abort detected. Assembly stopping.");
3788 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
3789 // FIXME: Actually abort assembly here.
3794 /// parseDirectiveInclude
3795 /// ::= .include "filename"
3796 bool AsmParser::parseDirectiveInclude() {
3797 if (getLexer().isNot(AsmToken::String))
3798 return TokError("expected string in '.include' directive");
3800 // Allow the strings to have escaped octal character sequence.
3801 std::string Filename;
3802 if (parseEscapedString(Filename))
3804 SMLoc IncludeLoc = getLexer().getLoc();
3807 if (getLexer().isNot(AsmToken::EndOfStatement))
3808 return TokError("unexpected token in '.include' directive");
3810 // Attempt to switch the lexer to the included file before consuming the end
3811 // of statement to avoid losing it when we switch.
3812 if (enterIncludeFile(Filename)) {
3813 Error(IncludeLoc, "Could not find include file '" + Filename + "'");
3820 /// parseDirectiveIncbin
3821 /// ::= .incbin "filename"
3822 bool AsmParser::parseDirectiveIncbin() {
3823 if (getLexer().isNot(AsmToken::String))
3824 return TokError("expected string in '.incbin' directive");
3826 // Allow the strings to have escaped octal character sequence.
3827 std::string Filename;
3828 if (parseEscapedString(Filename))
3830 SMLoc IncbinLoc = getLexer().getLoc();
3833 if (getLexer().isNot(AsmToken::EndOfStatement))
3834 return TokError("unexpected token in '.incbin' directive");
3836 // Attempt to process the included file.
3837 if (processIncbinFile(Filename)) {
3838 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
3845 /// parseDirectiveIf
3846 /// ::= .if{,eq,ge,gt,le,lt,ne} expression
3847 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) {
3848 TheCondStack.push_back(TheCondState);
3849 TheCondState.TheCond = AsmCond::IfCond;
3850 if (TheCondState.Ignore) {
3851 eatToEndOfStatement();
3854 if (parseAbsoluteExpression(ExprValue))
3857 if (getLexer().isNot(AsmToken::EndOfStatement))
3858 return TokError("unexpected token in '.if' directive");
3864 llvm_unreachable("unsupported directive");
3869 ExprValue = ExprValue == 0;
3872 ExprValue = ExprValue >= 0;
3875 ExprValue = ExprValue > 0;
3878 ExprValue = ExprValue <= 0;
3881 ExprValue = ExprValue < 0;
3885 TheCondState.CondMet = ExprValue;
3886 TheCondState.Ignore = !TheCondState.CondMet;
3892 /// parseDirectiveIfb
3894 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
3895 TheCondStack.push_back(TheCondState);
3896 TheCondState.TheCond = AsmCond::IfCond;
3898 if (TheCondState.Ignore) {
3899 eatToEndOfStatement();
3901 StringRef Str = parseStringToEndOfStatement();
3903 if (getLexer().isNot(AsmToken::EndOfStatement))
3904 return TokError("unexpected token in '.ifb' directive");
3908 TheCondState.CondMet = ExpectBlank == Str.empty();
3909 TheCondState.Ignore = !TheCondState.CondMet;
3915 /// parseDirectiveIfc
3916 /// ::= .ifc string1, string2
3917 /// ::= .ifnc string1, string2
3918 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
3919 TheCondStack.push_back(TheCondState);
3920 TheCondState.TheCond = AsmCond::IfCond;
3922 if (TheCondState.Ignore) {
3923 eatToEndOfStatement();
3925 StringRef Str1 = parseStringToComma();
3927 if (getLexer().isNot(AsmToken::Comma))
3928 return TokError("unexpected token in '.ifc' directive");
3932 StringRef Str2 = parseStringToEndOfStatement();
3934 if (getLexer().isNot(AsmToken::EndOfStatement))
3935 return TokError("unexpected token in '.ifc' directive");
3939 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim());
3940 TheCondState.Ignore = !TheCondState.CondMet;
3946 /// parseDirectiveIfeqs
3947 /// ::= .ifeqs string1, string2
3948 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) {
3949 if (Lexer.isNot(AsmToken::String)) {
3951 TokError("expected string parameter for '.ifeqs' directive");
3953 TokError("expected string parameter for '.ifnes' directive");
3954 eatToEndOfStatement();
3958 StringRef String1 = getTok().getStringContents();
3961 if (Lexer.isNot(AsmToken::Comma)) {
3963 TokError("expected comma after first string for '.ifeqs' directive");
3965 TokError("expected comma after first string for '.ifnes' directive");
3966 eatToEndOfStatement();
3972 if (Lexer.isNot(AsmToken::String)) {
3974 TokError("expected string parameter for '.ifeqs' directive");
3976 TokError("expected string parameter for '.ifnes' directive");
3977 eatToEndOfStatement();
3981 StringRef String2 = getTok().getStringContents();
3984 TheCondStack.push_back(TheCondState);
3985 TheCondState.TheCond = AsmCond::IfCond;
3986 TheCondState.CondMet = ExpectEqual == (String1 == String2);
3987 TheCondState.Ignore = !TheCondState.CondMet;
3992 /// parseDirectiveIfdef
3993 /// ::= .ifdef symbol
3994 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
3996 TheCondStack.push_back(TheCondState);
3997 TheCondState.TheCond = AsmCond::IfCond;
3999 if (TheCondState.Ignore) {
4000 eatToEndOfStatement();
4002 if (parseIdentifier(Name))
4003 return TokError("expected identifier after '.ifdef'");
4007 MCSymbol *Sym = getContext().lookupSymbol(Name);
4010 TheCondState.CondMet = (Sym && !Sym->isUndefined());
4012 TheCondState.CondMet = (!Sym || Sym->isUndefined());
4013 TheCondState.Ignore = !TheCondState.CondMet;
4019 /// parseDirectiveElseIf
4020 /// ::= .elseif expression
4021 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
4022 if (TheCondState.TheCond != AsmCond::IfCond &&
4023 TheCondState.TheCond != AsmCond::ElseIfCond)
4024 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
4026 TheCondState.TheCond = AsmCond::ElseIfCond;
4028 bool LastIgnoreState = false;
4029 if (!TheCondStack.empty())
4030 LastIgnoreState = TheCondStack.back().Ignore;
4031 if (LastIgnoreState || TheCondState.CondMet) {
4032 TheCondState.Ignore = true;
4033 eatToEndOfStatement();
4036 if (parseAbsoluteExpression(ExprValue))
4039 if (getLexer().isNot(AsmToken::EndOfStatement))
4040 return TokError("unexpected token in '.elseif' directive");
4043 TheCondState.CondMet = ExprValue;
4044 TheCondState.Ignore = !TheCondState.CondMet;
4050 /// parseDirectiveElse
4052 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
4053 if (getLexer().isNot(AsmToken::EndOfStatement))
4054 return TokError("unexpected token in '.else' directive");
4058 if (TheCondState.TheCond != AsmCond::IfCond &&
4059 TheCondState.TheCond != AsmCond::ElseIfCond)
4060 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
4062 TheCondState.TheCond = AsmCond::ElseCond;
4063 bool LastIgnoreState = false;
4064 if (!TheCondStack.empty())
4065 LastIgnoreState = TheCondStack.back().Ignore;
4066 if (LastIgnoreState || TheCondState.CondMet)
4067 TheCondState.Ignore = true;
4069 TheCondState.Ignore = false;
4074 /// parseDirectiveEnd
4076 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) {
4077 if (getLexer().isNot(AsmToken::EndOfStatement))
4078 return TokError("unexpected token in '.end' directive");
4082 while (Lexer.isNot(AsmToken::Eof))
4088 /// parseDirectiveError
4090 /// ::= .error [string]
4091 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) {
4092 if (!TheCondStack.empty()) {
4093 if (TheCondStack.back().Ignore) {
4094 eatToEndOfStatement();
4100 return Error(L, ".err encountered");
4102 StringRef Message = ".error directive invoked in source file";
4103 if (Lexer.isNot(AsmToken::EndOfStatement)) {
4104 if (Lexer.isNot(AsmToken::String)) {
4105 TokError(".error argument must be a string");
4106 eatToEndOfStatement();
4110 Message = getTok().getStringContents();
4118 /// parseDirectiveWarning
4119 /// ::= .warning [string]
4120 bool AsmParser::parseDirectiveWarning(SMLoc L) {
4121 if (!TheCondStack.empty()) {
4122 if (TheCondStack.back().Ignore) {
4123 eatToEndOfStatement();
4128 StringRef Message = ".warning directive invoked in source file";
4129 if (Lexer.isNot(AsmToken::EndOfStatement)) {
4130 if (Lexer.isNot(AsmToken::String)) {
4131 TokError(".warning argument must be a string");
4132 eatToEndOfStatement();
4136 Message = getTok().getStringContents();
4140 Warning(L, Message);
4144 /// parseDirectiveEndIf
4146 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
4147 if (getLexer().isNot(AsmToken::EndOfStatement))
4148 return TokError("unexpected token in '.endif' directive");
4152 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
4153 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
4155 if (!TheCondStack.empty()) {
4156 TheCondState = TheCondStack.back();
4157 TheCondStack.pop_back();
4163 void AsmParser::initializeDirectiveKindMap() {
4164 DirectiveKindMap[".set"] = DK_SET;
4165 DirectiveKindMap[".equ"] = DK_EQU;
4166 DirectiveKindMap[".equiv"] = DK_EQUIV;
4167 DirectiveKindMap[".ascii"] = DK_ASCII;
4168 DirectiveKindMap[".asciz"] = DK_ASCIZ;
4169 DirectiveKindMap[".string"] = DK_STRING;
4170 DirectiveKindMap[".byte"] = DK_BYTE;
4171 DirectiveKindMap[".short"] = DK_SHORT;
4172 DirectiveKindMap[".value"] = DK_VALUE;
4173 DirectiveKindMap[".2byte"] = DK_2BYTE;
4174 DirectiveKindMap[".long"] = DK_LONG;
4175 DirectiveKindMap[".int"] = DK_INT;
4176 DirectiveKindMap[".4byte"] = DK_4BYTE;
4177 DirectiveKindMap[".quad"] = DK_QUAD;
4178 DirectiveKindMap[".8byte"] = DK_8BYTE;
4179 DirectiveKindMap[".octa"] = DK_OCTA;
4180 DirectiveKindMap[".single"] = DK_SINGLE;
4181 DirectiveKindMap[".float"] = DK_FLOAT;
4182 DirectiveKindMap[".double"] = DK_DOUBLE;
4183 DirectiveKindMap[".align"] = DK_ALIGN;
4184 DirectiveKindMap[".align32"] = DK_ALIGN32;
4185 DirectiveKindMap[".balign"] = DK_BALIGN;
4186 DirectiveKindMap[".balignw"] = DK_BALIGNW;
4187 DirectiveKindMap[".balignl"] = DK_BALIGNL;
4188 DirectiveKindMap[".p2align"] = DK_P2ALIGN;
4189 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
4190 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
4191 DirectiveKindMap[".org"] = DK_ORG;
4192 DirectiveKindMap[".fill"] = DK_FILL;
4193 DirectiveKindMap[".zero"] = DK_ZERO;
4194 DirectiveKindMap[".extern"] = DK_EXTERN;
4195 DirectiveKindMap[".globl"] = DK_GLOBL;
4196 DirectiveKindMap[".global"] = DK_GLOBAL;
4197 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
4198 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
4199 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
4200 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
4201 DirectiveKindMap[".reference"] = DK_REFERENCE;
4202 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
4203 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
4204 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
4205 DirectiveKindMap[".comm"] = DK_COMM;
4206 DirectiveKindMap[".common"] = DK_COMMON;
4207 DirectiveKindMap[".lcomm"] = DK_LCOMM;
4208 DirectiveKindMap[".abort"] = DK_ABORT;
4209 DirectiveKindMap[".include"] = DK_INCLUDE;
4210 DirectiveKindMap[".incbin"] = DK_INCBIN;
4211 DirectiveKindMap[".code16"] = DK_CODE16;
4212 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
4213 DirectiveKindMap[".rept"] = DK_REPT;
4214 DirectiveKindMap[".rep"] = DK_REPT;
4215 DirectiveKindMap[".irp"] = DK_IRP;
4216 DirectiveKindMap[".irpc"] = DK_IRPC;
4217 DirectiveKindMap[".endr"] = DK_ENDR;
4218 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
4219 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
4220 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
4221 DirectiveKindMap[".if"] = DK_IF;
4222 DirectiveKindMap[".ifeq"] = DK_IFEQ;
4223 DirectiveKindMap[".ifge"] = DK_IFGE;
4224 DirectiveKindMap[".ifgt"] = DK_IFGT;
4225 DirectiveKindMap[".ifle"] = DK_IFLE;
4226 DirectiveKindMap[".iflt"] = DK_IFLT;
4227 DirectiveKindMap[".ifne"] = DK_IFNE;
4228 DirectiveKindMap[".ifb"] = DK_IFB;
4229 DirectiveKindMap[".ifnb"] = DK_IFNB;
4230 DirectiveKindMap[".ifc"] = DK_IFC;
4231 DirectiveKindMap[".ifeqs"] = DK_IFEQS;
4232 DirectiveKindMap[".ifnc"] = DK_IFNC;
4233 DirectiveKindMap[".ifnes"] = DK_IFNES;
4234 DirectiveKindMap[".ifdef"] = DK_IFDEF;
4235 DirectiveKindMap[".ifndef"] = DK_IFNDEF;
4236 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
4237 DirectiveKindMap[".elseif"] = DK_ELSEIF;
4238 DirectiveKindMap[".else"] = DK_ELSE;
4239 DirectiveKindMap[".end"] = DK_END;
4240 DirectiveKindMap[".endif"] = DK_ENDIF;
4241 DirectiveKindMap[".skip"] = DK_SKIP;
4242 DirectiveKindMap[".space"] = DK_SPACE;
4243 DirectiveKindMap[".file"] = DK_FILE;
4244 DirectiveKindMap[".line"] = DK_LINE;
4245 DirectiveKindMap[".loc"] = DK_LOC;
4246 DirectiveKindMap[".stabs"] = DK_STABS;
4247 DirectiveKindMap[".sleb128"] = DK_SLEB128;
4248 DirectiveKindMap[".uleb128"] = DK_ULEB128;
4249 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
4250 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
4251 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
4252 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
4253 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
4254 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
4255 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
4256 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
4257 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
4258 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
4259 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
4260 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
4261 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
4262 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
4263 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
4264 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
4265 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
4266 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
4267 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
4268 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
4269 DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
4270 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
4271 DirectiveKindMap[".macro"] = DK_MACRO;
4272 DirectiveKindMap[".exitm"] = DK_EXITM;
4273 DirectiveKindMap[".endm"] = DK_ENDM;
4274 DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
4275 DirectiveKindMap[".purgem"] = DK_PURGEM;
4276 DirectiveKindMap[".err"] = DK_ERR;
4277 DirectiveKindMap[".error"] = DK_ERROR;
4278 DirectiveKindMap[".warning"] = DK_WARNING;
4281 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
4282 AsmToken EndToken, StartToken = getTok();
4284 unsigned NestLevel = 0;
4286 // Check whether we have reached the end of the file.
4287 if (getLexer().is(AsmToken::Eof)) {
4288 Error(DirectiveLoc, "no matching '.endr' in definition");
4292 if (Lexer.is(AsmToken::Identifier) &&
4293 (getTok().getIdentifier() == ".rept")) {
4297 // Otherwise, check whether we have reached the .endr.
4298 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
4299 if (NestLevel == 0) {
4300 EndToken = getTok();
4302 if (Lexer.isNot(AsmToken::EndOfStatement)) {
4303 TokError("unexpected token in '.endr' directive");
4311 // Otherwise, scan till the end of the statement.
4312 eatToEndOfStatement();
4315 const char *BodyStart = StartToken.getLoc().getPointer();
4316 const char *BodyEnd = EndToken.getLoc().getPointer();
4317 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
4319 // We Are Anonymous.
4320 MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters());
4321 return &MacroLikeBodies.back();
4324 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
4325 raw_svector_ostream &OS) {
4328 std::unique_ptr<MemoryBuffer> Instantiation =
4329 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
4331 // Create the macro instantiation object and add to the current macro
4332 // instantiation stack.
4333 MacroInstantiation *MI = new MacroInstantiation(
4334 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
4335 ActiveMacros.push_back(MI);
4337 // Jump to the macro instantiation and prime the lexer.
4338 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
4339 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
4343 /// parseDirectiveRept
4344 /// ::= .rep | .rept count
4345 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) {
4346 const MCExpr *CountExpr;
4347 SMLoc CountLoc = getTok().getLoc();
4348 if (parseExpression(CountExpr))
4352 if (!CountExpr->evaluateAsAbsolute(Count)) {
4353 eatToEndOfStatement();
4354 return Error(CountLoc, "unexpected token in '" + Dir + "' directive");
4358 return Error(CountLoc, "Count is negative");
4360 if (Lexer.isNot(AsmToken::EndOfStatement))
4361 return TokError("unexpected token in '" + Dir + "' directive");
4363 // Eat the end of statement.
4366 // Lex the rept definition.
4367 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4371 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4372 // to hold the macro body with substitutions.
4373 SmallString<256> Buf;
4374 raw_svector_ostream OS(Buf);
4376 // Note that the AtPseudoVariable is disabled for instantiations of .rep(t).
4377 if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc()))
4380 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4385 /// parseDirectiveIrp
4386 /// ::= .irp symbol,values
4387 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
4388 MCAsmMacroParameter Parameter;
4390 if (parseIdentifier(Parameter.Name))
4391 return TokError("expected identifier in '.irp' directive");
4393 if (Lexer.isNot(AsmToken::Comma))
4394 return TokError("expected comma in '.irp' directive");
4398 MCAsmMacroArguments A;
4399 if (parseMacroArguments(nullptr, A))
4402 // Eat the end of statement.
4405 // Lex the irp definition.
4406 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4410 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4411 // to hold the macro body with substitutions.
4412 SmallString<256> Buf;
4413 raw_svector_ostream OS(Buf);
4415 for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
4416 // Note that the AtPseudoVariable is enabled for instantiations of .irp.
4417 // This is undocumented, but GAS seems to support it.
4418 if (expandMacro(OS, M->Body, Parameter, *i, true, getTok().getLoc()))
4422 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4427 /// parseDirectiveIrpc
4428 /// ::= .irpc symbol,values
4429 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
4430 MCAsmMacroParameter Parameter;
4432 if (parseIdentifier(Parameter.Name))
4433 return TokError("expected identifier in '.irpc' directive");
4435 if (Lexer.isNot(AsmToken::Comma))
4436 return TokError("expected comma in '.irpc' directive");
4440 MCAsmMacroArguments A;
4441 if (parseMacroArguments(nullptr, A))
4444 if (A.size() != 1 || A.front().size() != 1)
4445 return TokError("unexpected token in '.irpc' directive");
4447 // Eat the end of statement.
4450 // Lex the irpc definition.
4451 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4455 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4456 // to hold the macro body with substitutions.
4457 SmallString<256> Buf;
4458 raw_svector_ostream OS(Buf);
4460 StringRef Values = A.front().front().getString();
4461 for (std::size_t I = 0, End = Values.size(); I != End; ++I) {
4462 MCAsmMacroArgument Arg;
4463 Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1));
4465 // Note that the AtPseudoVariable is enabled for instantiations of .irpc.
4466 // This is undocumented, but GAS seems to support it.
4467 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
4471 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4476 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
4477 if (ActiveMacros.empty())
4478 return TokError("unmatched '.endr' directive");
4480 // The only .repl that should get here are the ones created by
4481 // instantiateMacroLikeBody.
4482 assert(getLexer().is(AsmToken::EndOfStatement));
4488 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
4490 const MCExpr *Value;
4491 SMLoc ExprLoc = getLexer().getLoc();
4492 if (parseExpression(Value))
4494 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4496 return Error(ExprLoc, "unexpected expression in _emit");
4497 uint64_t IntValue = MCE->getValue();
4498 if (!isUIntN(8, IntValue) && !isIntN(8, IntValue))
4499 return Error(ExprLoc, "literal value out of range for directive");
4501 Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, Len));
4505 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
4506 const MCExpr *Value;
4507 SMLoc ExprLoc = getLexer().getLoc();
4508 if (parseExpression(Value))
4510 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4512 return Error(ExprLoc, "unexpected expression in align");
4513 uint64_t IntValue = MCE->getValue();
4514 if (!isPowerOf2_64(IntValue))
4515 return Error(ExprLoc, "literal value not a power of two greater then zero");
4517 Info.AsmRewrites->push_back(
4518 AsmRewrite(AOK_Align, IDLoc, 5, Log2_64(IntValue)));
4522 // We are comparing pointers, but the pointers are relative to a single string.
4523 // Thus, this should always be deterministic.
4524 static int rewritesSort(const AsmRewrite *AsmRewriteA,
4525 const AsmRewrite *AsmRewriteB) {
4526 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
4528 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
4531 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
4532 // rewrite to the same location. Make sure the SizeDirective rewrite is
4533 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
4534 // ensures the sort algorithm is stable.
4535 if (AsmRewritePrecedence[AsmRewriteA->Kind] >
4536 AsmRewritePrecedence[AsmRewriteB->Kind])
4539 if (AsmRewritePrecedence[AsmRewriteA->Kind] <
4540 AsmRewritePrecedence[AsmRewriteB->Kind])
4542 llvm_unreachable("Unstable rewrite sort.");
4545 bool AsmParser::parseMSInlineAsm(
4546 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
4547 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls,
4548 SmallVectorImpl<std::string> &Constraints,
4549 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
4550 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
4551 SmallVector<void *, 4> InputDecls;
4552 SmallVector<void *, 4> OutputDecls;
4553 SmallVector<bool, 4> InputDeclsAddressOf;
4554 SmallVector<bool, 4> OutputDeclsAddressOf;
4555 SmallVector<std::string, 4> InputConstraints;
4556 SmallVector<std::string, 4> OutputConstraints;
4557 SmallVector<unsigned, 4> ClobberRegs;
4559 SmallVector<AsmRewrite, 4> AsmStrRewrites;
4564 // While we have input, parse each statement.
4565 unsigned InputIdx = 0;
4566 unsigned OutputIdx = 0;
4567 while (getLexer().isNot(AsmToken::Eof)) {
4568 ParseStatementInfo Info(&AsmStrRewrites);
4569 if (parseStatement(Info, &SI))
4572 if (Info.ParseError)
4575 if (Info.Opcode == ~0U)
4578 const MCInstrDesc &Desc = MII->get(Info.Opcode);
4580 // Build the list of clobbers, outputs and inputs.
4581 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
4582 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i];
4585 if (Operand.isImm())
4588 // Register operand.
4589 if (Operand.isReg() && !Operand.needAddressOf() &&
4590 !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) {
4591 unsigned NumDefs = Desc.getNumDefs();
4593 if (NumDefs && Operand.getMCOperandNum() < NumDefs)
4594 ClobberRegs.push_back(Operand.getReg());
4598 // Expr/Input or Output.
4599 StringRef SymName = Operand.getSymName();
4600 if (SymName.empty())
4603 void *OpDecl = Operand.getOpDecl();
4607 bool isOutput = (i == 1) && Desc.mayStore();
4608 SMLoc Start = SMLoc::getFromPointer(SymName.data());
4611 OutputDecls.push_back(OpDecl);
4612 OutputDeclsAddressOf.push_back(Operand.needAddressOf());
4613 OutputConstraints.push_back(("=" + Operand.getConstraint()).str());
4614 AsmStrRewrites.push_back(AsmRewrite(AOK_Output, Start, SymName.size()));
4616 InputDecls.push_back(OpDecl);
4617 InputDeclsAddressOf.push_back(Operand.needAddressOf());
4618 InputConstraints.push_back(Operand.getConstraint().str());
4619 AsmStrRewrites.push_back(AsmRewrite(AOK_Input, Start, SymName.size()));
4623 // Consider implicit defs to be clobbers. Think of cpuid and push.
4624 ArrayRef<uint16_t> ImpDefs(Desc.getImplicitDefs(),
4625 Desc.getNumImplicitDefs());
4626 ClobberRegs.insert(ClobberRegs.end(), ImpDefs.begin(), ImpDefs.end());
4629 // Set the number of Outputs and Inputs.
4630 NumOutputs = OutputDecls.size();
4631 NumInputs = InputDecls.size();
4633 // Set the unique clobbers.
4634 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
4635 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
4637 Clobbers.assign(ClobberRegs.size(), std::string());
4638 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
4639 raw_string_ostream OS(Clobbers[I]);
4640 IP->printRegName(OS, ClobberRegs[I]);
4643 // Merge the various outputs and inputs. Output are expected first.
4644 if (NumOutputs || NumInputs) {
4645 unsigned NumExprs = NumOutputs + NumInputs;
4646 OpDecls.resize(NumExprs);
4647 Constraints.resize(NumExprs);
4648 for (unsigned i = 0; i < NumOutputs; ++i) {
4649 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
4650 Constraints[i] = OutputConstraints[i];
4652 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
4653 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
4654 Constraints[j] = InputConstraints[i];
4658 // Build the IR assembly string.
4659 std::string AsmStringIR;
4660 raw_string_ostream OS(AsmStringIR);
4661 StringRef ASMString =
4662 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer();
4663 const char *AsmStart = ASMString.begin();
4664 const char *AsmEnd = ASMString.end();
4665 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
4666 for (const AsmRewrite &AR : AsmStrRewrites) {
4667 AsmRewriteKind Kind = AR.Kind;
4668 if (Kind == AOK_Delete)
4671 const char *Loc = AR.Loc.getPointer();
4672 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!");
4674 // Emit everything up to the immediate/expression.
4675 if (unsigned Len = Loc - AsmStart)
4676 OS << StringRef(AsmStart, Len);
4678 // Skip the original expression.
4679 if (Kind == AOK_Skip) {
4680 AsmStart = Loc + AR.Len;
4684 unsigned AdditionalSkip = 0;
4685 // Rewrite expressions in $N notation.
4690 OS << "$$" << AR.Val;
4696 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label;
4699 OS << '$' << InputIdx++;
4702 OS << '$' << OutputIdx++;
4704 case AOK_SizeDirective:
4707 case 8: OS << "byte ptr "; break;
4708 case 16: OS << "word ptr "; break;
4709 case 32: OS << "dword ptr "; break;
4710 case 64: OS << "qword ptr "; break;
4711 case 80: OS << "xword ptr "; break;
4712 case 128: OS << "xmmword ptr "; break;
4713 case 256: OS << "ymmword ptr "; break;
4720 unsigned Val = AR.Val;
4721 OS << ".align " << Val;
4723 // Skip the original immediate.
4724 assert(Val < 10 && "Expected alignment less then 2^10.");
4725 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
4728 case AOK_DotOperator:
4729 // Insert the dot if the user omitted it.
4731 if (AsmStringIR.back() != '.')
4737 // Skip the original expression.
4738 AsmStart = Loc + AR.Len + AdditionalSkip;
4741 // Emit the remainder of the asm string.
4742 if (AsmStart != AsmEnd)
4743 OS << StringRef(AsmStart, AsmEnd - AsmStart);
4745 AsmString = OS.str();
4750 namespace MCParserUtils {
4752 /// Returns whether the given symbol is used anywhere in the given expression,
4753 /// or subexpressions.
4754 static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) {
4755 switch (Value->getKind()) {
4756 case MCExpr::Binary: {
4757 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
4758 return isSymbolUsedInExpression(Sym, BE->getLHS()) ||
4759 isSymbolUsedInExpression(Sym, BE->getRHS());
4761 case MCExpr::Target:
4762 case MCExpr::Constant:
4764 case MCExpr::SymbolRef: {
4766 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
4768 return isSymbolUsedInExpression(Sym, S.getVariableValue());
4772 return isSymbolUsedInExpression(
4773 Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
4776 llvm_unreachable("Unknown expr kind!");
4779 bool parseAssignmentExpression(StringRef Name, bool allow_redef,
4780 MCAsmParser &Parser, MCSymbol *&Sym,
4781 const MCExpr *&Value) {
4782 MCAsmLexer &Lexer = Parser.getLexer();
4784 // FIXME: Use better location, we should use proper tokens.
4785 SMLoc EqualLoc = Lexer.getLoc();
4787 if (Parser.parseExpression(Value)) {
4788 Parser.TokError("missing expression");
4789 Parser.eatToEndOfStatement();
4793 // Note: we don't count b as used in "a = b". This is to allow
4797 if (Lexer.isNot(AsmToken::EndOfStatement))
4798 return Parser.TokError("unexpected token in assignment");
4800 // Eat the end of statement marker.
4803 // Validate that the LHS is allowed to be a variable (either it has not been
4804 // used as a symbol, or it is an absolute symbol).
4805 Sym = Parser.getContext().lookupSymbol(Name);
4807 // Diagnose assignment to a label.
4809 // FIXME: Diagnostics. Note the location of the definition as a label.
4810 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
4811 if (isSymbolUsedInExpression(Sym, Value))
4812 return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'");
4813 else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() &&
4815 ; // Allow redefinitions of undefined symbols only used in directives.
4816 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
4817 ; // Allow redefinitions of variables that haven't yet been used.
4818 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
4819 return Parser.Error(EqualLoc, "redefinition of '" + Name + "'");
4820 else if (!Sym->isVariable())
4821 return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'");
4822 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
4823 return Parser.Error(EqualLoc,
4824 "invalid reassignment of non-absolute variable '" +
4826 } else if (Name == ".") {
4827 if (Parser.getStreamer().EmitValueToOffset(Value, 0)) {
4828 Parser.Error(EqualLoc, "expected absolute expression");
4829 Parser.eatToEndOfStatement();
4834 Sym = Parser.getContext().getOrCreateSymbol(Name);
4836 Sym->setRedefinable(allow_redef);
4841 } // namespace MCParserUtils
4844 /// \brief Create an MCAsmParser instance.
4845 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
4846 MCStreamer &Out, const MCAsmInfo &MAI) {
4847 return new AsmParser(SM, C, Out, MAI);