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/MCParsedAsmOperand.h"
30 #include "llvm/MC/MCRegisterInfo.h"
31 #include "llvm/MC/MCSectionMachO.h"
32 #include "llvm/MC/MCStreamer.h"
33 #include "llvm/MC/MCSymbol.h"
34 #include "llvm/MC/MCTargetAsmParser.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/MathExtras.h"
38 #include "llvm/Support/MemoryBuffer.h"
39 #include "llvm/Support/SourceMgr.h"
40 #include "llvm/Support/raw_ostream.h"
48 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {}
51 /// \brief Helper types for tracking macro definitions.
52 typedef std::vector<AsmToken> MCAsmMacroArgument;
53 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
55 struct MCAsmMacroParameter {
57 MCAsmMacroArgument Value;
61 MCAsmMacroParameter() : Required(false), Vararg(false) {}
64 typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters;
69 MCAsmMacroParameters Parameters;
72 MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P)
73 : Name(N), Body(B), Parameters(std::move(P)) {}
76 /// \brief Helper class for storing information about an active macro
78 struct MacroInstantiation {
79 /// The location of the instantiation.
80 SMLoc InstantiationLoc;
82 /// The buffer where parsing should resume upon instantiation completion.
85 /// The location where parsing should resume upon instantiation completion.
88 /// The depth of TheCondStack at the start of the instantiation.
89 size_t CondStackDepth;
92 MacroInstantiation(SMLoc IL, int EB, SMLoc EL, size_t CondStackDepth);
95 struct ParseStatementInfo {
96 /// \brief The parsed operands from the last parsed statement.
97 SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands;
99 /// \brief The opcode from the last parsed instruction.
102 /// \brief Was there an error parsing the inline assembly?
105 SmallVectorImpl<AsmRewrite> *AsmRewrites;
107 ParseStatementInfo() : Opcode(~0U), ParseError(false), AsmRewrites(nullptr) {}
108 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
109 : Opcode(~0), ParseError(false), AsmRewrites(rewrites) {}
112 /// \brief The concrete assembly parser instance.
113 class AsmParser : public MCAsmParser {
114 AsmParser(const AsmParser &) = delete;
115 void operator=(const AsmParser &) = delete;
120 const MCAsmInfo &MAI;
122 SourceMgr::DiagHandlerTy SavedDiagHandler;
123 void *SavedDiagContext;
124 std::unique_ptr<MCAsmParserExtension> PlatformParser;
126 /// This is the current buffer index we're lexing from as managed by the
127 /// SourceMgr object.
130 AsmCond TheCondState;
131 std::vector<AsmCond> TheCondStack;
133 /// \brief maps directive names to handler methods in parser
134 /// extensions. Extensions register themselves in this map by calling
135 /// addDirectiveHandler.
136 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
138 /// \brief Map of currently defined macros.
139 StringMap<MCAsmMacro> MacroMap;
141 /// \brief Stack of active macro instantiations.
142 std::vector<MacroInstantiation*> ActiveMacros;
144 /// \brief List of bodies of anonymous macros.
145 std::deque<MCAsmMacro> MacroLikeBodies;
147 /// Boolean tracking whether macro substitution is enabled.
148 unsigned MacrosEnabledFlag : 1;
150 /// Flag tracking whether any errors have been encountered.
151 unsigned HadError : 1;
153 /// The values from the last parsed cpp hash file line comment if any.
154 StringRef CppHashFilename;
155 int64_t CppHashLineNumber;
158 /// When generating dwarf for assembly source files we need to calculate the
159 /// logical line number based on the last parsed cpp hash file line comment
160 /// and current line. Since this is slow and messes up the SourceMgr's
161 /// cache we save the last info we queried with SrcMgr.FindLineNumber().
162 SMLoc LastQueryIDLoc;
163 unsigned LastQueryBuffer;
164 unsigned LastQueryLine;
166 /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
167 unsigned AssemblerDialect;
169 /// \brief is Darwin compatibility enabled?
172 /// \brief Are we parsing ms-style inline assembly?
173 bool ParsingInlineAsm;
176 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
177 const MCAsmInfo &MAI);
178 virtual ~AsmParser();
180 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;
182 void addDirectiveHandler(StringRef Directive,
183 ExtensionDirectiveHandler Handler) override {
184 ExtensionDirectiveMap[Directive] = Handler;
188 /// @name MCAsmParser Interface
191 SourceMgr &getSourceManager() override { return SrcMgr; }
192 MCAsmLexer &getLexer() override { return Lexer; }
193 MCContext &getContext() override { return Ctx; }
194 MCStreamer &getStreamer() override { return Out; }
195 unsigned getAssemblerDialect() override {
196 if (AssemblerDialect == ~0U)
197 return MAI.getAssemblerDialect();
199 return AssemblerDialect;
201 void setAssemblerDialect(unsigned i) override {
202 AssemblerDialect = i;
205 void Note(SMLoc L, const Twine &Msg,
206 ArrayRef<SMRange> Ranges = None) override;
207 bool Warning(SMLoc L, const Twine &Msg,
208 ArrayRef<SMRange> Ranges = None) override;
209 bool Error(SMLoc L, const Twine &Msg,
210 ArrayRef<SMRange> Ranges = None) override;
212 const AsmToken &Lex() override;
214 void setParsingInlineAsm(bool V) override { ParsingInlineAsm = V; }
215 bool isParsingInlineAsm() override { return ParsingInlineAsm; }
217 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
218 unsigned &NumOutputs, unsigned &NumInputs,
219 SmallVectorImpl<std::pair<void *,bool> > &OpDecls,
220 SmallVectorImpl<std::string> &Constraints,
221 SmallVectorImpl<std::string> &Clobbers,
222 const MCInstrInfo *MII, const MCInstPrinter *IP,
223 MCAsmParserSemaCallback &SI) override;
225 bool parseExpression(const MCExpr *&Res);
226 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
227 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) override;
228 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
229 bool parseAbsoluteExpression(int64_t &Res) override;
231 /// \brief Parse an identifier or string (as a quoted identifier)
232 /// and set \p Res to the identifier contents.
233 bool parseIdentifier(StringRef &Res) override;
234 void eatToEndOfStatement() override;
236 void checkForValidSection() override;
241 bool parseStatement(ParseStatementInfo &Info,
242 MCAsmParserSemaCallback *SI);
243 void eatToEndOfLine();
244 bool parseCppHashLineFilenameComment(const SMLoc &L);
246 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
247 ArrayRef<MCAsmMacroParameter> Parameters);
248 bool expandMacro(raw_svector_ostream &OS, StringRef Body,
249 ArrayRef<MCAsmMacroParameter> Parameters,
250 ArrayRef<MCAsmMacroArgument> A,
253 /// \brief Are macros enabled in the parser?
254 bool areMacrosEnabled() {return MacrosEnabledFlag;}
256 /// \brief Control a flag in the parser that enables or disables macros.
257 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}
259 /// \brief Lookup a previously defined macro.
260 /// \param Name Macro name.
261 /// \returns Pointer to macro. NULL if no such macro was defined.
262 const MCAsmMacro* lookupMacro(StringRef Name);
264 /// \brief Define a new macro with the given name and information.
265 void defineMacro(StringRef Name, MCAsmMacro Macro);
267 /// \brief Undefine a macro. If no such macro was defined, it's a no-op.
268 void undefineMacro(StringRef Name);
270 /// \brief Are we inside a macro instantiation?
271 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();}
273 /// \brief Handle entry to macro instantiation.
275 /// \param M The macro.
276 /// \param NameLoc Instantiation location.
277 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
279 /// \brief Handle exit from macro instantiation.
280 void handleMacroExit();
282 /// \brief Extract AsmTokens for a macro argument.
283 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg);
285 /// \brief Parse all macro arguments for a given macro.
286 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
288 void printMacroInstantiations();
289 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
290 ArrayRef<SMRange> Ranges = None) const {
291 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
293 static void DiagHandler(const SMDiagnostic &Diag, void *Context);
295 /// \brief Enter the specified file. This returns true on failure.
296 bool enterIncludeFile(const std::string &Filename);
298 /// \brief Process the specified file for the .incbin directive.
299 /// This returns true on failure.
300 bool processIncbinFile(const std::string &Filename);
302 /// \brief Reset the current lexer position to that given by \p Loc. The
303 /// current token is not set; clients should ensure Lex() is called
306 /// \param InBuffer If not 0, should be the known buffer id that contains the
308 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0);
310 /// \brief Parse up to the end of statement and a return the contents from the
311 /// current token until the end of the statement; the current token on exit
312 /// will be either the EndOfStatement or EOF.
313 StringRef parseStringToEndOfStatement() override;
315 /// \brief Parse until the end of a statement or a comma is encountered,
316 /// return the contents from the current token up to the end or comma.
317 StringRef parseStringToComma();
319 bool parseAssignment(StringRef Name, bool allow_redef,
320 bool NoDeadStrip = false);
322 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
323 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
324 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);
326 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);
328 // Generic (target and platform independent) directive parsing.
330 DK_NO_DIRECTIVE, // Placeholder
331 DK_SET, DK_EQU, DK_EQUIV, DK_ASCII, DK_ASCIZ, DK_STRING, DK_BYTE, DK_SHORT,
332 DK_VALUE, DK_2BYTE, DK_LONG, DK_INT, DK_4BYTE, DK_QUAD, DK_8BYTE, DK_OCTA,
333 DK_SINGLE, DK_FLOAT, DK_DOUBLE, DK_ALIGN, DK_ALIGN32, DK_BALIGN, DK_BALIGNW,
334 DK_BALIGNL, DK_P2ALIGN, DK_P2ALIGNW, DK_P2ALIGNL, DK_ORG, DK_FILL, DK_ENDR,
335 DK_BUNDLE_ALIGN_MODE, DK_BUNDLE_LOCK, DK_BUNDLE_UNLOCK,
336 DK_ZERO, DK_EXTERN, DK_GLOBL, DK_GLOBAL,
337 DK_LAZY_REFERENCE, DK_NO_DEAD_STRIP, DK_SYMBOL_RESOLVER, DK_PRIVATE_EXTERN,
338 DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE,
339 DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT,
340 DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC,
341 DK_IF, DK_IFEQ, DK_IFGE, DK_IFGT, DK_IFLE, DK_IFLT, DK_IFNE, DK_IFB,
342 DK_IFNB, DK_IFC, DK_IFEQS, DK_IFNC, DK_IFDEF, DK_IFNDEF, DK_IFNOTDEF,
343 DK_ELSEIF, DK_ELSE, DK_ENDIF,
344 DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS,
345 DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA,
346 DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER,
347 DK_CFI_OFFSET, DK_CFI_REL_OFFSET, DK_CFI_PERSONALITY, DK_CFI_LSDA,
348 DK_CFI_REMEMBER_STATE, DK_CFI_RESTORE_STATE, DK_CFI_SAME_VALUE,
349 DK_CFI_RESTORE, DK_CFI_ESCAPE, DK_CFI_SIGNAL_FRAME, DK_CFI_UNDEFINED,
350 DK_CFI_REGISTER, DK_CFI_WINDOW_SAVE,
351 DK_MACROS_ON, DK_MACROS_OFF,
352 DK_MACRO, DK_EXITM, DK_ENDM, DK_ENDMACRO, DK_PURGEM,
353 DK_SLEB128, DK_ULEB128,
354 DK_ERR, DK_ERROR, DK_WARNING,
358 /// \brief Maps directive name --> DirectiveKind enum, for
359 /// directives parsed by this class.
360 StringMap<DirectiveKind> DirectiveKindMap;
362 // ".ascii", ".asciz", ".string"
363 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
364 bool parseDirectiveValue(unsigned Size); // ".byte", ".long", ...
365 bool parseDirectiveOctaValue(); // ".octa"
366 bool parseDirectiveRealValue(const fltSemantics &); // ".single", ...
367 bool parseDirectiveFill(); // ".fill"
368 bool parseDirectiveZero(); // ".zero"
369 // ".set", ".equ", ".equiv"
370 bool parseDirectiveSet(StringRef IDVal, bool allow_redef);
371 bool parseDirectiveOrg(); // ".org"
372 // ".align{,32}", ".p2align{,w,l}"
373 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize);
375 // ".file", ".line", ".loc", ".stabs"
376 bool parseDirectiveFile(SMLoc DirectiveLoc);
377 bool parseDirectiveLine();
378 bool parseDirectiveLoc();
379 bool parseDirectiveStabs();
382 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc);
383 bool parseDirectiveCFIWindowSave();
384 bool parseDirectiveCFISections();
385 bool parseDirectiveCFIStartProc();
386 bool parseDirectiveCFIEndProc();
387 bool parseDirectiveCFIDefCfaOffset();
388 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
389 bool parseDirectiveCFIAdjustCfaOffset();
390 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
391 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
392 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
393 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
394 bool parseDirectiveCFIRememberState();
395 bool parseDirectiveCFIRestoreState();
396 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
397 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
398 bool parseDirectiveCFIEscape();
399 bool parseDirectiveCFISignalFrame();
400 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
403 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
404 bool parseDirectiveExitMacro(StringRef Directive);
405 bool parseDirectiveEndMacro(StringRef Directive);
406 bool parseDirectiveMacro(SMLoc DirectiveLoc);
407 bool parseDirectiveMacrosOnOff(StringRef Directive);
409 // ".bundle_align_mode"
410 bool parseDirectiveBundleAlignMode();
412 bool parseDirectiveBundleLock();
414 bool parseDirectiveBundleUnlock();
417 bool parseDirectiveSpace(StringRef IDVal);
419 // .sleb128 (Signed=true) and .uleb128 (Signed=false)
420 bool parseDirectiveLEB128(bool Signed);
422 /// \brief Parse a directive like ".globl" which
423 /// accepts a single symbol (which should be a label or an external).
424 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);
426 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
428 bool parseDirectiveAbort(); // ".abort"
429 bool parseDirectiveInclude(); // ".include"
430 bool parseDirectiveIncbin(); // ".incbin"
432 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne"
433 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
434 // ".ifb" or ".ifnb", depending on ExpectBlank.
435 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
436 // ".ifc" or ".ifnc", depending on ExpectEqual.
437 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
439 bool parseDirectiveIfeqs(SMLoc DirectiveLoc);
440 // ".ifdef" or ".ifndef", depending on expect_defined
441 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
442 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
443 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
444 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
445 bool parseEscapedString(std::string &Data) override;
447 const MCExpr *applyModifierToExpr(const MCExpr *E,
448 MCSymbolRefExpr::VariantKind Variant);
450 // Macro-like directives
451 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
452 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
453 raw_svector_ostream &OS);
454 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive);
455 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
456 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
457 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
459 // "_emit" or "__emit"
460 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
464 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
467 bool parseDirectiveEnd(SMLoc DirectiveLoc);
469 // ".err" or ".error"
470 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage);
473 bool parseDirectiveWarning(SMLoc DirectiveLoc);
475 void initializeDirectiveKindMap();
481 extern MCAsmParserExtension *createDarwinAsmParser();
482 extern MCAsmParserExtension *createELFAsmParser();
483 extern MCAsmParserExtension *createCOFFAsmParser();
487 enum { DEFAULT_ADDRSPACE = 0 };
489 AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
490 const MCAsmInfo &_MAI)
491 : Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM),
492 PlatformParser(nullptr), CurBuffer(_SM.getMainFileID()),
493 MacrosEnabledFlag(true), HadError(false), CppHashLineNumber(0),
494 AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false) {
495 // Save the old handler.
496 SavedDiagHandler = SrcMgr.getDiagHandler();
497 SavedDiagContext = SrcMgr.getDiagContext();
498 // Set our own handler which calls the saved handler.
499 SrcMgr.setDiagHandler(DiagHandler, this);
500 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
502 // Initialize the platform / file format parser.
503 switch (_Ctx.getObjectFileInfo()->getObjectFileType()) {
504 case MCObjectFileInfo::IsCOFF:
505 PlatformParser.reset(createCOFFAsmParser());
507 case MCObjectFileInfo::IsMachO:
508 PlatformParser.reset(createDarwinAsmParser());
511 case MCObjectFileInfo::IsELF:
512 PlatformParser.reset(createELFAsmParser());
516 PlatformParser->Initialize(*this);
517 initializeDirectiveKindMap();
520 AsmParser::~AsmParser() {
521 assert((HadError || ActiveMacros.empty()) &&
522 "Unexpected active macro instantiation!");
525 void AsmParser::printMacroInstantiations() {
526 // Print the active macro instantiation stack.
527 for (std::vector<MacroInstantiation *>::const_reverse_iterator
528 it = ActiveMacros.rbegin(),
529 ie = ActiveMacros.rend();
531 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
532 "while in macro instantiation");
535 void AsmParser::Note(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
536 printMessage(L, SourceMgr::DK_Note, Msg, Ranges);
537 printMacroInstantiations();
540 bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
541 if (getTargetParser().getTargetOptions().MCFatalWarnings)
542 return Error(L, Msg, Ranges);
543 printMessage(L, SourceMgr::DK_Warning, Msg, Ranges);
544 printMacroInstantiations();
548 bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) {
550 printMessage(L, SourceMgr::DK_Error, Msg, Ranges);
551 printMacroInstantiations();
555 bool AsmParser::enterIncludeFile(const std::string &Filename) {
556 std::string IncludedFile;
558 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
563 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
567 /// Process the specified .incbin file by searching for it in the include paths
568 /// then just emitting the byte contents of the file to the streamer. This
569 /// returns true on failure.
570 bool AsmParser::processIncbinFile(const std::string &Filename) {
571 std::string IncludedFile;
573 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
577 // Pick up the bytes from the file and emit them.
578 getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer());
582 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) {
583 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
584 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
588 const AsmToken &AsmParser::Lex() {
589 const AsmToken *tok = &Lexer.Lex();
591 if (tok->is(AsmToken::Eof)) {
592 // If this is the end of an included file, pop the parent file off the
594 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
595 if (ParentIncludeLoc != SMLoc()) {
596 jumpToLoc(ParentIncludeLoc);
601 if (tok->is(AsmToken::Error))
602 Error(Lexer.getErrLoc(), Lexer.getErr());
607 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
608 // Create the initial section, if requested.
609 if (!NoInitialTextSection)
610 Out.InitSections(false);
616 AsmCond StartingCondState = TheCondState;
618 // If we are generating dwarf for assembly source files save the initial text
619 // section and generate a .file directive.
620 if (getContext().getGenDwarfForAssembly()) {
621 MCSymbol *SectionStartSym = getContext().CreateTempSymbol();
622 getStreamer().EmitLabel(SectionStartSym);
623 auto InsertResult = getContext().addGenDwarfSection(
624 getStreamer().getCurrentSection().first);
625 assert(InsertResult.second && ".text section should not have debug info yet");
626 InsertResult.first->second.first = SectionStartSym;
627 getContext().setGenDwarfFileNumber(getStreamer().EmitDwarfFileDirective(
628 0, StringRef(), getContext().getMainFileName()));
631 // While we have input, parse each statement.
632 while (Lexer.isNot(AsmToken::Eof)) {
633 ParseStatementInfo Info;
634 if (!parseStatement(Info, nullptr))
637 // We had an error, validate that one was emitted and recover by skipping to
639 assert(HadError && "Parse statement returned an error, but none emitted!");
640 eatToEndOfStatement();
643 if (TheCondState.TheCond != StartingCondState.TheCond ||
644 TheCondState.Ignore != StartingCondState.Ignore)
645 return TokError("unmatched .ifs or .elses");
647 // Check to see there are no empty DwarfFile slots.
648 const auto &LineTables = getContext().getMCDwarfLineTables();
649 if (!LineTables.empty()) {
651 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) {
652 if (File.Name.empty() && Index != 0)
653 TokError("unassigned file number: " + Twine(Index) +
654 " for .file directives");
659 // Check to see that all assembler local symbols were actually defined.
660 // Targets that don't do subsections via symbols may not want this, though,
661 // so conservatively exclude them. Only do this if we're finalizing, though,
662 // as otherwise we won't necessarilly have seen everything yet.
663 if (!NoFinalize && MAI.hasSubsectionsViaSymbols()) {
664 const MCContext::SymbolTable &Symbols = getContext().getSymbols();
665 for (MCContext::SymbolTable::const_iterator i = Symbols.begin(),
668 MCSymbol *Sym = i->getValue();
669 // Variable symbols may not be marked as defined, so check those
670 // explicitly. If we know it's a variable, we have a definition for
671 // the purposes of this check.
672 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
673 // FIXME: We would really like to refer back to where the symbol was
674 // first referenced for a source location. We need to add something
675 // to track that. Currently, we just point to the end of the file.
677 getLexer().getLoc(), SourceMgr::DK_Error,
678 "assembler local symbol '" + Sym->getName() + "' not defined");
682 // Finalize the output stream if there are no errors and if the client wants
684 if (!HadError && !NoFinalize)
690 void AsmParser::checkForValidSection() {
691 if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) {
692 TokError("expected section directive before assembly directive");
693 Out.InitSections(false);
697 /// \brief Throw away the rest of the line for testing purposes.
698 void AsmParser::eatToEndOfStatement() {
699 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
703 if (Lexer.is(AsmToken::EndOfStatement))
707 StringRef AsmParser::parseStringToEndOfStatement() {
708 const char *Start = getTok().getLoc().getPointer();
710 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
713 const char *End = getTok().getLoc().getPointer();
714 return StringRef(Start, End - Start);
717 StringRef AsmParser::parseStringToComma() {
718 const char *Start = getTok().getLoc().getPointer();
720 while (Lexer.isNot(AsmToken::EndOfStatement) &&
721 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
724 const char *End = getTok().getLoc().getPointer();
725 return StringRef(Start, End - Start);
728 /// \brief Parse a paren expression and return it.
729 /// NOTE: This assumes the leading '(' has already been consumed.
731 /// parenexpr ::= expr)
733 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
734 if (parseExpression(Res))
736 if (Lexer.isNot(AsmToken::RParen))
737 return TokError("expected ')' in parentheses expression");
738 EndLoc = Lexer.getTok().getEndLoc();
743 /// \brief Parse a bracket expression and return it.
744 /// NOTE: This assumes the leading '[' has already been consumed.
746 /// bracketexpr ::= expr]
748 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
749 if (parseExpression(Res))
751 if (Lexer.isNot(AsmToken::RBrac))
752 return TokError("expected ']' in brackets expression");
753 EndLoc = Lexer.getTok().getEndLoc();
758 /// \brief Parse a primary expression and return it.
759 /// primaryexpr ::= (parenexpr
760 /// primaryexpr ::= symbol
761 /// primaryexpr ::= number
762 /// primaryexpr ::= '.'
763 /// primaryexpr ::= ~,+,- primaryexpr
764 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
765 SMLoc FirstTokenLoc = getLexer().getLoc();
766 AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
767 switch (FirstTokenKind) {
769 return TokError("unknown token in expression");
770 // If we have an error assume that we've already handled it.
771 case AsmToken::Error:
773 case AsmToken::Exclaim:
774 Lex(); // Eat the operator.
775 if (parsePrimaryExpr(Res, EndLoc))
777 Res = MCUnaryExpr::CreateLNot(Res, getContext());
779 case AsmToken::Dollar:
781 case AsmToken::String:
782 case AsmToken::Identifier: {
783 StringRef Identifier;
784 if (parseIdentifier(Identifier)) {
785 if (FirstTokenKind == AsmToken::Dollar) {
786 if (Lexer.getMAI().getDollarIsPC()) {
787 // This is a '$' reference, which references the current PC. Emit a
788 // temporary label to the streamer and refer to it.
789 MCSymbol *Sym = Ctx.CreateTempSymbol();
791 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None,
793 EndLoc = FirstTokenLoc;
796 return Error(FirstTokenLoc, "invalid token in expression");
799 // Parse symbol variant
800 std::pair<StringRef, StringRef> Split;
801 if (!MAI.useParensForSymbolVariant()) {
802 if (FirstTokenKind == AsmToken::String) {
803 if (Lexer.is(AsmToken::At)) {
804 Lexer.Lex(); // eat @
805 SMLoc AtLoc = getLexer().getLoc();
807 if (parseIdentifier(VName))
808 return Error(AtLoc, "expected symbol variant after '@'");
810 Split = std::make_pair(Identifier, VName);
813 Split = Identifier.split('@');
815 } else if (Lexer.is(AsmToken::LParen)) {
816 Lexer.Lex(); // eat (
818 parseIdentifier(VName);
819 if (Lexer.isNot(AsmToken::RParen)) {
820 return Error(Lexer.getTok().getLoc(),
821 "unexpected token in variant, expected ')'");
823 Lexer.Lex(); // eat )
824 Split = std::make_pair(Identifier, VName);
827 EndLoc = SMLoc::getFromPointer(Identifier.end());
829 // This is a symbol reference.
830 StringRef SymbolName = Identifier;
831 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
833 // Lookup the symbol variant if used.
834 if (Split.second.size()) {
835 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
836 if (Variant != MCSymbolRefExpr::VK_Invalid) {
837 SymbolName = Split.first;
838 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) {
839 Variant = MCSymbolRefExpr::VK_None;
841 return Error(SMLoc::getFromPointer(Split.second.begin()),
842 "invalid variant '" + Split.second + "'");
846 MCSymbol *Sym = getContext().GetOrCreateSymbol(SymbolName);
848 // If this is an absolute variable reference, substitute it now to preserve
849 // semantics in the face of reassignment.
850 if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) {
852 return Error(EndLoc, "unexpected modifier on variable reference");
854 Res = Sym->getVariableValue();
858 // Otherwise create a symbol ref.
859 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
862 case AsmToken::BigNum:
863 return TokError("literal value out of range for directive");
864 case AsmToken::Integer: {
865 SMLoc Loc = getTok().getLoc();
866 int64_t IntVal = getTok().getIntVal();
867 Res = MCConstantExpr::Create(IntVal, getContext());
868 EndLoc = Lexer.getTok().getEndLoc();
870 // Look for 'b' or 'f' following an Integer as a directional label
871 if (Lexer.getKind() == AsmToken::Identifier) {
872 StringRef IDVal = getTok().getString();
873 // Lookup the symbol variant if used.
874 std::pair<StringRef, StringRef> Split = IDVal.split('@');
875 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
876 if (Split.first.size() != IDVal.size()) {
877 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
878 if (Variant == MCSymbolRefExpr::VK_Invalid)
879 return TokError("invalid variant '" + Split.second + "'");
882 if (IDVal == "f" || IDVal == "b") {
884 Ctx.GetDirectionalLocalSymbol(IntVal, IDVal == "b");
885 Res = MCSymbolRefExpr::Create(Sym, Variant, getContext());
886 if (IDVal == "b" && Sym->isUndefined())
887 return Error(Loc, "invalid reference to undefined symbol");
888 EndLoc = Lexer.getTok().getEndLoc();
889 Lex(); // Eat identifier.
894 case AsmToken::Real: {
895 APFloat RealVal(APFloat::IEEEdouble, getTok().getString());
896 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
897 Res = MCConstantExpr::Create(IntVal, getContext());
898 EndLoc = Lexer.getTok().getEndLoc();
902 case AsmToken::Dot: {
903 // This is a '.' reference, which references the current PC. Emit a
904 // temporary label to the streamer and refer to it.
905 MCSymbol *Sym = Ctx.CreateTempSymbol();
907 Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext());
908 EndLoc = Lexer.getTok().getEndLoc();
909 Lex(); // Eat identifier.
912 case AsmToken::LParen:
913 Lex(); // Eat the '('.
914 return parseParenExpr(Res, EndLoc);
915 case AsmToken::LBrac:
916 if (!PlatformParser->HasBracketExpressions())
917 return TokError("brackets expression not supported on this target");
918 Lex(); // Eat the '['.
919 return parseBracketExpr(Res, EndLoc);
920 case AsmToken::Minus:
921 Lex(); // Eat the operator.
922 if (parsePrimaryExpr(Res, EndLoc))
924 Res = MCUnaryExpr::CreateMinus(Res, getContext());
927 Lex(); // Eat the operator.
928 if (parsePrimaryExpr(Res, EndLoc))
930 Res = MCUnaryExpr::CreatePlus(Res, getContext());
932 case AsmToken::Tilde:
933 Lex(); // Eat the operator.
934 if (parsePrimaryExpr(Res, EndLoc))
936 Res = MCUnaryExpr::CreateNot(Res, getContext());
941 bool AsmParser::parseExpression(const MCExpr *&Res) {
943 return parseExpression(Res, EndLoc);
947 AsmParser::applyModifierToExpr(const MCExpr *E,
948 MCSymbolRefExpr::VariantKind Variant) {
949 // Ask the target implementation about this expression first.
950 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
953 // Recurse over the given expression, rebuilding it to apply the given variant
954 // if there is exactly one symbol.
955 switch (E->getKind()) {
957 case MCExpr::Constant:
960 case MCExpr::SymbolRef: {
961 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
963 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
964 TokError("invalid variant on expression '" + getTok().getIdentifier() +
965 "' (already modified)");
969 return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext());
972 case MCExpr::Unary: {
973 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
974 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
977 return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext());
980 case MCExpr::Binary: {
981 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
982 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
983 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
993 return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext());
997 llvm_unreachable("Invalid expression kind!");
1000 /// \brief Parse an expression and return it.
1002 /// expr ::= expr &&,|| expr -> lowest.
1003 /// expr ::= expr |,^,&,! expr
1004 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr
1005 /// expr ::= expr <<,>> expr
1006 /// expr ::= expr +,- expr
1007 /// expr ::= expr *,/,% expr -> highest.
1008 /// expr ::= primaryexpr
1010 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1011 // Parse the expression.
1013 if (parsePrimaryExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc))
1016 // As a special case, we support 'a op b @ modifier' by rewriting the
1017 // expression to include the modifier. This is inefficient, but in general we
1018 // expect users to use 'a@modifier op b'.
1019 if (Lexer.getKind() == AsmToken::At) {
1022 if (Lexer.isNot(AsmToken::Identifier))
1023 return TokError("unexpected symbol modifier following '@'");
1025 MCSymbolRefExpr::VariantKind Variant =
1026 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
1027 if (Variant == MCSymbolRefExpr::VK_Invalid)
1028 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
1030 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
1032 return TokError("invalid modifier '" + getTok().getIdentifier() +
1033 "' (no symbols present)");
1040 // Try to constant fold it up front, if possible.
1042 if (Res->EvaluateAsAbsolute(Value))
1043 Res = MCConstantExpr::Create(Value, getContext());
1048 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1050 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1053 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1056 SMLoc StartLoc = Lexer.getLoc();
1057 if (parseExpression(Expr))
1060 if (!Expr->EvaluateAsAbsolute(Res))
1061 return Error(StartLoc, "expected absolute expression");
1066 static unsigned getBinOpPrecedence(AsmToken::TokenKind K,
1067 MCBinaryExpr::Opcode &Kind) {
1070 return 0; // not a binop.
1072 // Lowest Precedence: &&, ||
1073 case AsmToken::AmpAmp:
1074 Kind = MCBinaryExpr::LAnd;
1076 case AsmToken::PipePipe:
1077 Kind = MCBinaryExpr::LOr;
1080 // Low Precedence: |, &, ^
1082 // FIXME: gas seems to support '!' as an infix operator?
1083 case AsmToken::Pipe:
1084 Kind = MCBinaryExpr::Or;
1086 case AsmToken::Caret:
1087 Kind = MCBinaryExpr::Xor;
1090 Kind = MCBinaryExpr::And;
1093 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1094 case AsmToken::EqualEqual:
1095 Kind = MCBinaryExpr::EQ;
1097 case AsmToken::ExclaimEqual:
1098 case AsmToken::LessGreater:
1099 Kind = MCBinaryExpr::NE;
1101 case AsmToken::Less:
1102 Kind = MCBinaryExpr::LT;
1104 case AsmToken::LessEqual:
1105 Kind = MCBinaryExpr::LTE;
1107 case AsmToken::Greater:
1108 Kind = MCBinaryExpr::GT;
1110 case AsmToken::GreaterEqual:
1111 Kind = MCBinaryExpr::GTE;
1114 // Intermediate Precedence: <<, >>
1115 case AsmToken::LessLess:
1116 Kind = MCBinaryExpr::Shl;
1118 case AsmToken::GreaterGreater:
1119 Kind = MCBinaryExpr::Shr;
1122 // High Intermediate Precedence: +, -
1123 case AsmToken::Plus:
1124 Kind = MCBinaryExpr::Add;
1126 case AsmToken::Minus:
1127 Kind = MCBinaryExpr::Sub;
1130 // Highest Precedence: *, /, %
1131 case AsmToken::Star:
1132 Kind = MCBinaryExpr::Mul;
1134 case AsmToken::Slash:
1135 Kind = MCBinaryExpr::Div;
1137 case AsmToken::Percent:
1138 Kind = MCBinaryExpr::Mod;
1143 /// \brief Parse all binary operators with precedence >= 'Precedence'.
1144 /// Res contains the LHS of the expression on input.
1145 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1148 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1149 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1151 // If the next token is lower precedence than we are allowed to eat, return
1152 // successfully with what we ate already.
1153 if (TokPrec < Precedence)
1158 // Eat the next primary expression.
1160 if (parsePrimaryExpr(RHS, EndLoc))
1163 // If BinOp binds less tightly with RHS than the operator after RHS, let
1164 // the pending operator take RHS as its LHS.
1165 MCBinaryExpr::Opcode Dummy;
1166 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1167 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1170 // Merge LHS and RHS according to operator.
1171 Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext());
1176 /// ::= EndOfStatement
1177 /// ::= Label* Directive ...Operands... EndOfStatement
1178 /// ::= Label* Identifier OperandList* EndOfStatement
1179 bool AsmParser::parseStatement(ParseStatementInfo &Info,
1180 MCAsmParserSemaCallback *SI) {
1181 if (Lexer.is(AsmToken::EndOfStatement)) {
1187 // Statements always start with an identifier or are a full line comment.
1188 AsmToken ID = getTok();
1189 SMLoc IDLoc = ID.getLoc();
1191 int64_t LocalLabelVal = -1;
1192 // A full line comment is a '#' as the first token.
1193 if (Lexer.is(AsmToken::Hash))
1194 return parseCppHashLineFilenameComment(IDLoc);
1196 // Allow an integer followed by a ':' as a directional local label.
1197 if (Lexer.is(AsmToken::Integer)) {
1198 LocalLabelVal = getTok().getIntVal();
1199 if (LocalLabelVal < 0) {
1200 if (!TheCondState.Ignore)
1201 return TokError("unexpected token at start of statement");
1204 IDVal = getTok().getString();
1205 Lex(); // Consume the integer token to be used as an identifier token.
1206 if (Lexer.getKind() != AsmToken::Colon) {
1207 if (!TheCondState.Ignore)
1208 return TokError("unexpected token at start of statement");
1211 } else if (Lexer.is(AsmToken::Dot)) {
1212 // Treat '.' as a valid identifier in this context.
1215 } else if (parseIdentifier(IDVal)) {
1216 if (!TheCondState.Ignore)
1217 return TokError("unexpected token at start of statement");
1221 // Handle conditional assembly here before checking for skipping. We
1222 // have to do this so that .endif isn't skipped in a ".if 0" block for
1224 StringMap<DirectiveKind>::const_iterator DirKindIt =
1225 DirectiveKindMap.find(IDVal);
1226 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1228 : DirKindIt->getValue();
1239 return parseDirectiveIf(IDLoc, DirKind);
1241 return parseDirectiveIfb(IDLoc, true);
1243 return parseDirectiveIfb(IDLoc, false);
1245 return parseDirectiveIfc(IDLoc, true);
1247 return parseDirectiveIfeqs(IDLoc);
1249 return parseDirectiveIfc(IDLoc, false);
1251 return parseDirectiveIfdef(IDLoc, true);
1254 return parseDirectiveIfdef(IDLoc, false);
1256 return parseDirectiveElseIf(IDLoc);
1258 return parseDirectiveElse(IDLoc);
1260 return parseDirectiveEndIf(IDLoc);
1263 // Ignore the statement if in the middle of inactive conditional
1265 if (TheCondState.Ignore) {
1266 eatToEndOfStatement();
1270 // FIXME: Recurse on local labels?
1272 // See what kind of statement we have.
1273 switch (Lexer.getKind()) {
1274 case AsmToken::Colon: {
1275 checkForValidSection();
1277 // identifier ':' -> Label.
1280 // Diagnose attempt to use '.' as a label.
1282 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1284 // Diagnose attempt to use a variable as a label.
1286 // FIXME: Diagnostics. Note the location of the definition as a label.
1287 // FIXME: This doesn't diagnose assignment to a symbol which has been
1288 // implicitly marked as external.
1290 if (LocalLabelVal == -1) {
1291 if (ParsingInlineAsm && SI) {
1292 StringRef RewrittenLabel = SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
1293 assert(RewrittenLabel.size() && "We should have an internal name here.");
1294 Info.AsmRewrites->push_back(AsmRewrite(AOK_Label, IDLoc,
1295 IDVal.size(), RewrittenLabel));
1296 IDVal = RewrittenLabel;
1298 Sym = getContext().GetOrCreateSymbol(IDVal);
1300 Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
1302 Sym->redefineIfPossible();
1304 if (!Sym->isUndefined() || Sym->isVariable())
1305 return Error(IDLoc, "invalid symbol redefinition");
1308 if (!ParsingInlineAsm)
1311 // If we are generating dwarf for assembly source files then gather the
1312 // info to make a dwarf label entry for this label if needed.
1313 if (getContext().getGenDwarfForAssembly())
1314 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1317 getTargetParser().onLabelParsed(Sym);
1319 // Consume any end of statement token, if present, to avoid spurious
1320 // AddBlankLine calls().
1321 if (Lexer.is(AsmToken::EndOfStatement)) {
1323 if (Lexer.is(AsmToken::Eof))
1330 case AsmToken::Equal:
1331 // identifier '=' ... -> assignment statement
1334 return parseAssignment(IDVal, true);
1336 default: // Normal instruction or directive.
1340 // If macros are enabled, check to see if this is a macro instantiation.
1341 if (areMacrosEnabled())
1342 if (const MCAsmMacro *M = lookupMacro(IDVal)) {
1343 return handleMacroEntry(M, IDLoc);
1346 // Otherwise, we have a normal instruction or directive.
1348 // Directives start with "."
1349 if (IDVal[0] == '.' && IDVal != ".") {
1350 // There are several entities interested in parsing directives:
1352 // 1. The target-specific assembly parser. Some directives are target
1353 // specific or may potentially behave differently on certain targets.
1354 // 2. Asm parser extensions. For example, platform-specific parsers
1355 // (like the ELF parser) register themselves as extensions.
1356 // 3. The generic directive parser implemented by this class. These are
1357 // all the directives that behave in a target and platform independent
1358 // manner, or at least have a default behavior that's shared between
1359 // all targets and platforms.
1361 // First query the target-specific parser. It will return 'true' if it
1362 // isn't interested in this directive.
1363 if (!getTargetParser().ParseDirective(ID))
1366 // Next, check the extension directive map to see if any extension has
1367 // registered itself to parse this directive.
1368 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
1369 ExtensionDirectiveMap.lookup(IDVal);
1371 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1373 // Finally, if no one else is interested in this directive, it must be
1374 // generic and familiar to this class.
1380 return parseDirectiveSet(IDVal, true);
1382 return parseDirectiveSet(IDVal, false);
1384 return parseDirectiveAscii(IDVal, false);
1387 return parseDirectiveAscii(IDVal, true);
1389 return parseDirectiveValue(1);
1393 return parseDirectiveValue(2);
1397 return parseDirectiveValue(4);
1400 return parseDirectiveValue(8);
1402 return parseDirectiveOctaValue();
1405 return parseDirectiveRealValue(APFloat::IEEEsingle);
1407 return parseDirectiveRealValue(APFloat::IEEEdouble);
1409 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1410 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1413 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1414 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1417 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1419 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1421 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1423 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1425 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1427 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1429 return parseDirectiveOrg();
1431 return parseDirectiveFill();
1433 return parseDirectiveZero();
1435 eatToEndOfStatement(); // .extern is the default, ignore it.
1439 return parseDirectiveSymbolAttribute(MCSA_Global);
1440 case DK_LAZY_REFERENCE:
1441 return parseDirectiveSymbolAttribute(MCSA_LazyReference);
1442 case DK_NO_DEAD_STRIP:
1443 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1444 case DK_SYMBOL_RESOLVER:
1445 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1446 case DK_PRIVATE_EXTERN:
1447 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1449 return parseDirectiveSymbolAttribute(MCSA_Reference);
1450 case DK_WEAK_DEFINITION:
1451 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1452 case DK_WEAK_REFERENCE:
1453 return parseDirectiveSymbolAttribute(MCSA_WeakReference);
1454 case DK_WEAK_DEF_CAN_BE_HIDDEN:
1455 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1458 return parseDirectiveComm(/*IsLocal=*/false);
1460 return parseDirectiveComm(/*IsLocal=*/true);
1462 return parseDirectiveAbort();
1464 return parseDirectiveInclude();
1466 return parseDirectiveIncbin();
1469 return TokError(Twine(IDVal) + " not supported yet");
1471 return parseDirectiveRept(IDLoc, IDVal);
1473 return parseDirectiveIrp(IDLoc);
1475 return parseDirectiveIrpc(IDLoc);
1477 return parseDirectiveEndr(IDLoc);
1478 case DK_BUNDLE_ALIGN_MODE:
1479 return parseDirectiveBundleAlignMode();
1480 case DK_BUNDLE_LOCK:
1481 return parseDirectiveBundleLock();
1482 case DK_BUNDLE_UNLOCK:
1483 return parseDirectiveBundleUnlock();
1485 return parseDirectiveLEB128(true);
1487 return parseDirectiveLEB128(false);
1490 return parseDirectiveSpace(IDVal);
1492 return parseDirectiveFile(IDLoc);
1494 return parseDirectiveLine();
1496 return parseDirectiveLoc();
1498 return parseDirectiveStabs();
1499 case DK_CFI_SECTIONS:
1500 return parseDirectiveCFISections();
1501 case DK_CFI_STARTPROC:
1502 return parseDirectiveCFIStartProc();
1503 case DK_CFI_ENDPROC:
1504 return parseDirectiveCFIEndProc();
1505 case DK_CFI_DEF_CFA:
1506 return parseDirectiveCFIDefCfa(IDLoc);
1507 case DK_CFI_DEF_CFA_OFFSET:
1508 return parseDirectiveCFIDefCfaOffset();
1509 case DK_CFI_ADJUST_CFA_OFFSET:
1510 return parseDirectiveCFIAdjustCfaOffset();
1511 case DK_CFI_DEF_CFA_REGISTER:
1512 return parseDirectiveCFIDefCfaRegister(IDLoc);
1514 return parseDirectiveCFIOffset(IDLoc);
1515 case DK_CFI_REL_OFFSET:
1516 return parseDirectiveCFIRelOffset(IDLoc);
1517 case DK_CFI_PERSONALITY:
1518 return parseDirectiveCFIPersonalityOrLsda(true);
1520 return parseDirectiveCFIPersonalityOrLsda(false);
1521 case DK_CFI_REMEMBER_STATE:
1522 return parseDirectiveCFIRememberState();
1523 case DK_CFI_RESTORE_STATE:
1524 return parseDirectiveCFIRestoreState();
1525 case DK_CFI_SAME_VALUE:
1526 return parseDirectiveCFISameValue(IDLoc);
1527 case DK_CFI_RESTORE:
1528 return parseDirectiveCFIRestore(IDLoc);
1530 return parseDirectiveCFIEscape();
1531 case DK_CFI_SIGNAL_FRAME:
1532 return parseDirectiveCFISignalFrame();
1533 case DK_CFI_UNDEFINED:
1534 return parseDirectiveCFIUndefined(IDLoc);
1535 case DK_CFI_REGISTER:
1536 return parseDirectiveCFIRegister(IDLoc);
1537 case DK_CFI_WINDOW_SAVE:
1538 return parseDirectiveCFIWindowSave();
1541 return parseDirectiveMacrosOnOff(IDVal);
1543 return parseDirectiveMacro(IDLoc);
1545 return parseDirectiveExitMacro(IDVal);
1548 return parseDirectiveEndMacro(IDVal);
1550 return parseDirectivePurgeMacro(IDLoc);
1552 return parseDirectiveEnd(IDLoc);
1554 return parseDirectiveError(IDLoc, false);
1556 return parseDirectiveError(IDLoc, true);
1558 return parseDirectiveWarning(IDLoc);
1561 return Error(IDLoc, "unknown directive");
1564 // __asm _emit or __asm __emit
1565 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
1566 IDVal == "_EMIT" || IDVal == "__EMIT"))
1567 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
1570 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
1571 return parseDirectiveMSAlign(IDLoc, Info);
1573 checkForValidSection();
1575 // Canonicalize the opcode to lower case.
1576 std::string OpcodeStr = IDVal.lower();
1577 ParseInstructionInfo IInfo(Info.AsmRewrites);
1578 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, IDLoc,
1579 Info.ParsedOperands);
1580 Info.ParseError = HadError;
1582 // Dump the parsed representation, if requested.
1583 if (getShowParsedOperands()) {
1584 SmallString<256> Str;
1585 raw_svector_ostream OS(Str);
1586 OS << "parsed instruction: [";
1587 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
1590 Info.ParsedOperands[i]->print(OS);
1594 printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
1597 // If we are generating dwarf for the current section then generate a .loc
1598 // directive for the instruction.
1599 if (!HadError && getContext().getGenDwarfForAssembly() &&
1600 getContext().getGenDwarfSectionSyms().count(
1601 getStreamer().getCurrentSection().first)) {
1603 if (ActiveMacros.empty())
1604 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
1606 Line = SrcMgr.FindLineNumber(ActiveMacros.back()->InstantiationLoc,
1607 ActiveMacros.back()->ExitBuffer);
1609 // If we previously parsed a cpp hash file line comment then make sure the
1610 // current Dwarf File is for the CppHashFilename if not then emit the
1611 // Dwarf File table for it and adjust the line number for the .loc.
1612 if (CppHashFilename.size()) {
1613 unsigned FileNumber = getStreamer().EmitDwarfFileDirective(
1614 0, StringRef(), CppHashFilename);
1615 getContext().setGenDwarfFileNumber(FileNumber);
1617 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's
1618 // cache with the different Loc from the call above we save the last
1619 // info we queried here with SrcMgr.FindLineNumber().
1620 unsigned CppHashLocLineNo;
1621 if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf)
1622 CppHashLocLineNo = LastQueryLine;
1624 CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf);
1625 LastQueryLine = CppHashLocLineNo;
1626 LastQueryIDLoc = CppHashLoc;
1627 LastQueryBuffer = CppHashBuf;
1629 Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo);
1632 getStreamer().EmitDwarfLocDirective(
1633 getContext().getGenDwarfFileNumber(), Line, 0,
1634 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0,
1638 // If parsing succeeded, match the instruction.
1641 getTargetParser().MatchAndEmitInstruction(IDLoc, Info.Opcode,
1642 Info.ParsedOperands, Out,
1643 ErrorInfo, ParsingInlineAsm);
1646 // Don't skip the rest of the line, the instruction parser is responsible for
1651 /// eatToEndOfLine uses the Lexer to eat the characters to the end of the line
1652 /// since they may not be able to be tokenized to get to the end of line token.
1653 void AsmParser::eatToEndOfLine() {
1654 if (!Lexer.is(AsmToken::EndOfStatement))
1655 Lexer.LexUntilEndOfLine();
1660 /// parseCppHashLineFilenameComment as this:
1661 /// ::= # number "filename"
1662 /// or just as a full line comment if it doesn't have a number and a string.
1663 bool AsmParser::parseCppHashLineFilenameComment(const SMLoc &L) {
1664 Lex(); // Eat the hash token.
1666 if (getLexer().isNot(AsmToken::Integer)) {
1667 // Consume the line since in cases it is not a well-formed line directive,
1668 // as if were simply a full line comment.
1673 int64_t LineNumber = getTok().getIntVal();
1676 if (getLexer().isNot(AsmToken::String)) {
1681 StringRef Filename = getTok().getString();
1682 // Get rid of the enclosing quotes.
1683 Filename = Filename.substr(1, Filename.size() - 2);
1685 // Save the SMLoc, Filename and LineNumber for later use by diagnostics.
1687 CppHashFilename = Filename;
1688 CppHashLineNumber = LineNumber;
1689 CppHashBuf = CurBuffer;
1691 // Ignore any trailing characters, they're just comment.
1696 /// \brief will use the last parsed cpp hash line filename comment
1697 /// for the Filename and LineNo if any in the diagnostic.
1698 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
1699 const AsmParser *Parser = static_cast<const AsmParser *>(Context);
1700 raw_ostream &OS = errs();
1702 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
1703 const SMLoc &DiagLoc = Diag.getLoc();
1704 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1705 unsigned CppHashBuf =
1706 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc);
1708 // Like SourceMgr::printMessage() we need to print the include stack if any
1709 // before printing the message.
1710 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
1711 if (!Parser->SavedDiagHandler && DiagCurBuffer &&
1712 DiagCurBuffer != DiagSrcMgr.getMainFileID()) {
1713 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
1714 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
1717 // If we have not parsed a cpp hash line filename comment or the source
1718 // manager changed or buffer changed (like in a nested include) then just
1719 // print the normal diagnostic using its Filename and LineNo.
1720 if (!Parser->CppHashLineNumber || &DiagSrcMgr != &Parser->SrcMgr ||
1721 DiagBuf != CppHashBuf) {
1722 if (Parser->SavedDiagHandler)
1723 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
1725 Diag.print(nullptr, OS);
1729 // Use the CppHashFilename and calculate a line number based on the
1730 // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for
1732 const std::string &Filename = Parser->CppHashFilename;
1734 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
1735 int CppHashLocLineNo =
1736 Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf);
1738 Parser->CppHashLineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
1740 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
1741 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
1742 Diag.getLineContents(), Diag.getRanges());
1744 if (Parser->SavedDiagHandler)
1745 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
1747 NewDiag.print(nullptr, OS);
1750 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
1751 // difference being that that function accepts '@' as part of identifiers and
1752 // we can't do that. AsmLexer.cpp should probably be changed to handle
1753 // '@' as a special case when needed.
1754 static bool isIdentifierChar(char c) {
1755 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
1759 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
1760 ArrayRef<MCAsmMacroParameter> Parameters,
1761 ArrayRef<MCAsmMacroArgument> A, const SMLoc &L) {
1762 unsigned NParameters = Parameters.size();
1763 bool HasVararg = NParameters ? Parameters.back().Vararg : false;
1764 if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
1765 return Error(L, "Wrong number of arguments");
1767 // A macro without parameters is handled differently on Darwin:
1768 // gas accepts no arguments and does no substitutions
1769 while (!Body.empty()) {
1770 // Scan for the next substitution.
1771 std::size_t End = Body.size(), Pos = 0;
1772 for (; Pos != End; ++Pos) {
1773 // Check for a substitution or escape.
1774 if (IsDarwin && !NParameters) {
1775 // This macro has no parameters, look for $0, $1, etc.
1776 if (Body[Pos] != '$' || Pos + 1 == End)
1779 char Next = Body[Pos + 1];
1780 if (Next == '$' || Next == 'n' ||
1781 isdigit(static_cast<unsigned char>(Next)))
1784 // This macro has parameters, look for \foo, \bar, etc.
1785 if (Body[Pos] == '\\' && Pos + 1 != End)
1791 OS << Body.slice(0, Pos);
1793 // Check if we reached the end.
1797 if (IsDarwin && !NParameters) {
1798 switch (Body[Pos + 1]) {
1804 // $n => number of arguments
1809 // $[0-9] => argument
1811 // Missing arguments are ignored.
1812 unsigned Index = Body[Pos + 1] - '0';
1813 if (Index >= A.size())
1816 // Otherwise substitute with the token values, with spaces eliminated.
1817 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1818 ie = A[Index].end();
1820 OS << it->getString();
1826 unsigned I = Pos + 1;
1827 while (isIdentifierChar(Body[I]) && I + 1 != End)
1830 const char *Begin = Body.data() + Pos + 1;
1831 StringRef Argument(Begin, I - (Pos + 1));
1833 for (; Index < NParameters; ++Index)
1834 if (Parameters[Index].Name == Argument)
1837 if (Index == NParameters) {
1838 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
1841 OS << '\\' << Argument;
1845 bool VarargParameter = HasVararg && Index == (NParameters - 1);
1846 for (MCAsmMacroArgument::const_iterator it = A[Index].begin(),
1847 ie = A[Index].end();
1849 // We expect no quotes around the string's contents when
1850 // parsing for varargs.
1851 if (it->getKind() != AsmToken::String || VarargParameter)
1852 OS << it->getString();
1854 OS << it->getStringContents();
1856 Pos += 1 + Argument.size();
1859 // Update the scan point.
1860 Body = Body.substr(Pos);
1866 MacroInstantiation::MacroInstantiation(SMLoc IL, int EB, SMLoc EL,
1867 size_t CondStackDepth)
1868 : InstantiationLoc(IL), ExitBuffer(EB), ExitLoc(EL),
1869 CondStackDepth(CondStackDepth) {}
1871 static bool isOperator(AsmToken::TokenKind kind) {
1875 case AsmToken::Plus:
1876 case AsmToken::Minus:
1877 case AsmToken::Tilde:
1878 case AsmToken::Slash:
1879 case AsmToken::Star:
1881 case AsmToken::Equal:
1882 case AsmToken::EqualEqual:
1883 case AsmToken::Pipe:
1884 case AsmToken::PipePipe:
1885 case AsmToken::Caret:
1887 case AsmToken::AmpAmp:
1888 case AsmToken::Exclaim:
1889 case AsmToken::ExclaimEqual:
1890 case AsmToken::Percent:
1891 case AsmToken::Less:
1892 case AsmToken::LessEqual:
1893 case AsmToken::LessLess:
1894 case AsmToken::LessGreater:
1895 case AsmToken::Greater:
1896 case AsmToken::GreaterEqual:
1897 case AsmToken::GreaterGreater:
1903 class AsmLexerSkipSpaceRAII {
1905 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
1906 Lexer.setSkipSpace(SkipSpace);
1909 ~AsmLexerSkipSpaceRAII() {
1910 Lexer.setSkipSpace(true);
1918 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) {
1921 if (Lexer.isNot(AsmToken::EndOfStatement)) {
1922 StringRef Str = parseStringToEndOfStatement();
1923 MA.push_back(AsmToken(AsmToken::String, Str));
1928 unsigned ParenLevel = 0;
1929 unsigned AddTokens = 0;
1931 // Darwin doesn't use spaces to delmit arguments.
1932 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
1935 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
1936 return TokError("unexpected token in macro instantiation");
1938 if (ParenLevel == 0 && Lexer.is(AsmToken::Comma))
1941 if (Lexer.is(AsmToken::Space)) {
1942 Lex(); // Eat spaces
1944 // Spaces can delimit parameters, but could also be part an expression.
1945 // If the token after a space is an operator, add the token and the next
1946 // one into this argument
1948 if (isOperator(Lexer.getKind())) {
1949 // Check to see whether the token is used as an operator,
1950 // or part of an identifier
1951 const char *NextChar = getTok().getEndLoc().getPointer();
1952 if (*NextChar == ' ')
1956 if (!AddTokens && ParenLevel == 0) {
1962 // handleMacroEntry relies on not advancing the lexer here
1963 // to be able to fill in the remaining default parameter values
1964 if (Lexer.is(AsmToken::EndOfStatement))
1967 // Adjust the current parentheses level.
1968 if (Lexer.is(AsmToken::LParen))
1970 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
1973 // Append the token to the current argument list.
1974 MA.push_back(getTok());
1980 if (ParenLevel != 0)
1981 return TokError("unbalanced parentheses in macro argument");
1985 // Parse the macro instantiation arguments.
1986 bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
1987 MCAsmMacroArguments &A) {
1988 const unsigned NParameters = M ? M->Parameters.size() : 0;
1989 bool NamedParametersFound = false;
1990 SmallVector<SMLoc, 4> FALocs;
1992 A.resize(NParameters);
1993 FALocs.resize(NParameters);
1995 // Parse two kinds of macro invocations:
1996 // - macros defined without any parameters accept an arbitrary number of them
1997 // - macros defined with parameters accept at most that many of them
1998 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false;
1999 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
2001 SMLoc IDLoc = Lexer.getLoc();
2002 MCAsmMacroParameter FA;
2004 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) {
2005 if (parseIdentifier(FA.Name)) {
2006 Error(IDLoc, "invalid argument identifier for formal argument");
2007 eatToEndOfStatement();
2011 if (!Lexer.is(AsmToken::Equal)) {
2012 TokError("expected '=' after formal parameter identifier");
2013 eatToEndOfStatement();
2018 NamedParametersFound = true;
2021 if (NamedParametersFound && FA.Name.empty()) {
2022 Error(IDLoc, "cannot mix positional and keyword arguments");
2023 eatToEndOfStatement();
2027 bool Vararg = HasVararg && Parameter == (NParameters - 1);
2028 if (parseMacroArgument(FA.Value, Vararg))
2031 unsigned PI = Parameter;
2032 if (!FA.Name.empty()) {
2034 for (FAI = 0; FAI < NParameters; ++FAI)
2035 if (M->Parameters[FAI].Name == FA.Name)
2038 if (FAI >= NParameters) {
2039 assert(M && "expected macro to be defined");
2041 "parameter named '" + FA.Name + "' does not exist for macro '" +
2048 if (!FA.Value.empty()) {
2053 if (FALocs.size() <= PI)
2054 FALocs.resize(PI + 1);
2056 FALocs[PI] = Lexer.getLoc();
2059 // At the end of the statement, fill in remaining arguments that have
2060 // default values. If there aren't any, then the next argument is
2061 // required but missing
2062 if (Lexer.is(AsmToken::EndOfStatement)) {
2063 bool Failure = false;
2064 for (unsigned FAI = 0; FAI < NParameters; ++FAI) {
2065 if (A[FAI].empty()) {
2066 if (M->Parameters[FAI].Required) {
2067 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(),
2068 "missing value for required parameter "
2069 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'");
2073 if (!M->Parameters[FAI].Value.empty())
2074 A[FAI] = M->Parameters[FAI].Value;
2080 if (Lexer.is(AsmToken::Comma))
2084 return TokError("too many positional arguments");
2087 const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) {
2088 StringMap<MCAsmMacro>::iterator I = MacroMap.find(Name);
2089 return (I == MacroMap.end()) ? nullptr : &I->getValue();
2092 void AsmParser::defineMacro(StringRef Name, MCAsmMacro Macro) {
2093 MacroMap.insert(std::make_pair(Name, std::move(Macro)));
2096 void AsmParser::undefineMacro(StringRef Name) { MacroMap.erase(Name); }
2098 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
2099 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
2100 // this, although we should protect against infinite loops.
2101 if (ActiveMacros.size() == 20)
2102 return TokError("macros cannot be nested more than 20 levels deep");
2104 MCAsmMacroArguments A;
2105 if (parseMacroArguments(M, A))
2108 // Macro instantiation is lexical, unfortunately. We construct a new buffer
2109 // to hold the macro body with substitutions.
2110 SmallString<256> Buf;
2111 StringRef Body = M->Body;
2112 raw_svector_ostream OS(Buf);
2114 if (expandMacro(OS, Body, M->Parameters, A, getTok().getLoc()))
2117 // We include the .endmacro in the buffer as our cue to exit the macro
2119 OS << ".endmacro\n";
2121 std::unique_ptr<MemoryBuffer> Instantiation =
2122 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2124 // Create the macro instantiation object and add to the current macro
2125 // instantiation stack.
2126 MacroInstantiation *MI = new MacroInstantiation(
2127 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
2128 ActiveMacros.push_back(MI);
2130 // Jump to the macro instantiation and prime the lexer.
2131 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
2132 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
2138 void AsmParser::handleMacroExit() {
2139 // Jump to the EndOfStatement we should return to, and consume it.
2140 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2143 // Pop the instantiation entry.
2144 delete ActiveMacros.back();
2145 ActiveMacros.pop_back();
2148 static bool isUsedIn(const MCSymbol *Sym, const MCExpr *Value) {
2149 switch (Value->getKind()) {
2150 case MCExpr::Binary: {
2151 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
2152 return isUsedIn(Sym, BE->getLHS()) || isUsedIn(Sym, BE->getRHS());
2154 case MCExpr::Target:
2155 case MCExpr::Constant:
2157 case MCExpr::SymbolRef: {
2159 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
2161 return isUsedIn(Sym, S.getVariableValue());
2165 return isUsedIn(Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
2168 llvm_unreachable("Unknown expr kind!");
2171 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
2173 // FIXME: Use better location, we should use proper tokens.
2174 SMLoc EqualLoc = Lexer.getLoc();
2176 const MCExpr *Value;
2177 if (parseExpression(Value))
2180 // Note: we don't count b as used in "a = b". This is to allow
2184 if (Lexer.isNot(AsmToken::EndOfStatement))
2185 return TokError("unexpected token in assignment");
2187 // Eat the end of statement marker.
2190 // Validate that the LHS is allowed to be a variable (either it has not been
2191 // used as a symbol, or it is an absolute symbol).
2192 MCSymbol *Sym = getContext().LookupSymbol(Name);
2194 // Diagnose assignment to a label.
2196 // FIXME: Diagnostics. Note the location of the definition as a label.
2197 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
2198 if (isUsedIn(Sym, Value))
2199 return Error(EqualLoc, "Recursive use of '" + Name + "'");
2200 else if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable())
2201 ; // Allow redefinitions of undefined symbols only used in directives.
2202 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
2203 ; // Allow redefinitions of variables that haven't yet been used.
2204 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
2205 return Error(EqualLoc, "redefinition of '" + Name + "'");
2206 else if (!Sym->isVariable())
2207 return Error(EqualLoc, "invalid assignment to '" + Name + "'");
2208 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
2209 return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
2212 // Don't count these checks as uses.
2213 Sym->setUsed(false);
2214 } else if (Name == ".") {
2215 if (Out.EmitValueToOffset(Value, 0)) {
2216 Error(EqualLoc, "expected absolute expression");
2217 eatToEndOfStatement();
2221 Sym = getContext().GetOrCreateSymbol(Name);
2223 Sym->setRedefinable(allow_redef);
2225 // Do the assignment.
2226 Out.EmitAssignment(Sym, Value);
2228 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2233 /// parseIdentifier:
2236 bool AsmParser::parseIdentifier(StringRef &Res) {
2237 // The assembler has relaxed rules for accepting identifiers, in particular we
2238 // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2239 // separate tokens. At this level, we have already lexed so we cannot (currently)
2240 // handle this as a context dependent token, instead we detect adjacent tokens
2241 // and return the combined identifier.
2242 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2243 SMLoc PrefixLoc = getLexer().getLoc();
2245 // Consume the prefix character, and check for a following identifier.
2247 if (Lexer.isNot(AsmToken::Identifier))
2250 // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
2251 if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer())
2254 // Construct the joined identifier and consume the token.
2256 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
2261 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
2264 Res = getTok().getIdentifier();
2266 Lex(); // Consume the identifier token.
2271 /// parseDirectiveSet:
2272 /// ::= .equ identifier ',' expression
2273 /// ::= .equiv identifier ',' expression
2274 /// ::= .set identifier ',' expression
2275 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
2278 if (parseIdentifier(Name))
2279 return TokError("expected identifier after '" + Twine(IDVal) + "'");
2281 if (getLexer().isNot(AsmToken::Comma))
2282 return TokError("unexpected token in '" + Twine(IDVal) + "'");
2285 return parseAssignment(Name, allow_redef, true);
2288 bool AsmParser::parseEscapedString(std::string &Data) {
2289 assert(getLexer().is(AsmToken::String) && "Unexpected current token!");
2292 StringRef Str = getTok().getStringContents();
2293 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2294 if (Str[i] != '\\') {
2299 // Recognize escaped characters. Note that this escape semantics currently
2300 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2303 return TokError("unexpected backslash at end of string");
2305 // Recognize octal sequences.
2306 if ((unsigned)(Str[i] - '0') <= 7) {
2307 // Consume up to three octal characters.
2308 unsigned Value = Str[i] - '0';
2310 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2312 Value = Value * 8 + (Str[i] - '0');
2314 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2316 Value = Value * 8 + (Str[i] - '0');
2321 return TokError("invalid octal escape sequence (out of range)");
2323 Data += (unsigned char)Value;
2327 // Otherwise recognize individual escapes.
2330 // Just reject invalid escape sequences for now.
2331 return TokError("invalid escape sequence (unrecognized character)");
2333 case 'b': Data += '\b'; break;
2334 case 'f': Data += '\f'; break;
2335 case 'n': Data += '\n'; break;
2336 case 'r': Data += '\r'; break;
2337 case 't': Data += '\t'; break;
2338 case '"': Data += '"'; break;
2339 case '\\': Data += '\\'; break;
2346 /// parseDirectiveAscii:
2347 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2348 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2349 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2350 checkForValidSection();
2353 if (getLexer().isNot(AsmToken::String))
2354 return TokError("expected string in '" + Twine(IDVal) + "' directive");
2357 if (parseEscapedString(Data))
2360 getStreamer().EmitBytes(Data);
2362 getStreamer().EmitBytes(StringRef("\0", 1));
2366 if (getLexer().is(AsmToken::EndOfStatement))
2369 if (getLexer().isNot(AsmToken::Comma))
2370 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
2379 /// parseDirectiveValue
2380 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
2381 bool AsmParser::parseDirectiveValue(unsigned Size) {
2382 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2383 checkForValidSection();
2386 const MCExpr *Value;
2387 SMLoc ExprLoc = getLexer().getLoc();
2388 if (parseExpression(Value))
2391 // Special case constant expressions to match code generator.
2392 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2393 assert(Size <= 8 && "Invalid size");
2394 uint64_t IntValue = MCE->getValue();
2395 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
2396 return Error(ExprLoc, "literal value out of range for directive");
2397 getStreamer().EmitIntValue(IntValue, Size);
2399 getStreamer().EmitValue(Value, Size, ExprLoc);
2401 if (getLexer().is(AsmToken::EndOfStatement))
2404 // FIXME: Improve diagnostic.
2405 if (getLexer().isNot(AsmToken::Comma))
2406 return TokError("unexpected token in directive");
2415 /// ParseDirectiveOctaValue
2416 /// ::= .octa [ hexconstant (, hexconstant)* ]
2417 bool AsmParser::parseDirectiveOctaValue() {
2418 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2419 checkForValidSection();
2422 if (Lexer.getKind() == AsmToken::Error)
2424 if (Lexer.getKind() != AsmToken::Integer &&
2425 Lexer.getKind() != AsmToken::BigNum)
2426 return TokError("unknown token in expression");
2428 SMLoc ExprLoc = getLexer().getLoc();
2429 APInt IntValue = getTok().getAPIntVal();
2433 if (IntValue.isIntN(64)) {
2435 lo = IntValue.getZExtValue();
2436 } else if (IntValue.isIntN(128)) {
2437 // It might actually have more than 128 bits, but the top ones are zero.
2438 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue();
2439 lo = IntValue.getLoBits(64).getZExtValue();
2441 return Error(ExprLoc, "literal value out of range for directive");
2443 if (MAI.isLittleEndian()) {
2444 getStreamer().EmitIntValue(lo, 8);
2445 getStreamer().EmitIntValue(hi, 8);
2447 getStreamer().EmitIntValue(hi, 8);
2448 getStreamer().EmitIntValue(lo, 8);
2451 if (getLexer().is(AsmToken::EndOfStatement))
2454 // FIXME: Improve diagnostic.
2455 if (getLexer().isNot(AsmToken::Comma))
2456 return TokError("unexpected token in directive");
2465 /// parseDirectiveRealValue
2466 /// ::= (.single | .double) [ expression (, expression)* ]
2467 bool AsmParser::parseDirectiveRealValue(const fltSemantics &Semantics) {
2468 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2469 checkForValidSection();
2472 // We don't truly support arithmetic on floating point expressions, so we
2473 // have to manually parse unary prefixes.
2475 if (getLexer().is(AsmToken::Minus)) {
2478 } else if (getLexer().is(AsmToken::Plus))
2481 if (getLexer().isNot(AsmToken::Integer) &&
2482 getLexer().isNot(AsmToken::Real) &&
2483 getLexer().isNot(AsmToken::Identifier))
2484 return TokError("unexpected token in directive");
2486 // Convert to an APFloat.
2487 APFloat Value(Semantics);
2488 StringRef IDVal = getTok().getString();
2489 if (getLexer().is(AsmToken::Identifier)) {
2490 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
2491 Value = APFloat::getInf(Semantics);
2492 else if (!IDVal.compare_lower("nan"))
2493 Value = APFloat::getNaN(Semantics, false, ~0);
2495 return TokError("invalid floating point literal");
2496 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
2497 APFloat::opInvalidOp)
2498 return TokError("invalid floating point literal");
2502 // Consume the numeric token.
2505 // Emit the value as an integer.
2506 APInt AsInt = Value.bitcastToAPInt();
2507 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
2508 AsInt.getBitWidth() / 8);
2510 if (getLexer().is(AsmToken::EndOfStatement))
2513 if (getLexer().isNot(AsmToken::Comma))
2514 return TokError("unexpected token in directive");
2523 /// parseDirectiveZero
2524 /// ::= .zero expression
2525 bool AsmParser::parseDirectiveZero() {
2526 checkForValidSection();
2529 if (parseAbsoluteExpression(NumBytes))
2533 if (getLexer().is(AsmToken::Comma)) {
2535 if (parseAbsoluteExpression(Val))
2539 if (getLexer().isNot(AsmToken::EndOfStatement))
2540 return TokError("unexpected token in '.zero' directive");
2544 getStreamer().EmitFill(NumBytes, Val);
2549 /// parseDirectiveFill
2550 /// ::= .fill expression [ , expression [ , expression ] ]
2551 bool AsmParser::parseDirectiveFill() {
2552 checkForValidSection();
2554 SMLoc RepeatLoc = getLexer().getLoc();
2556 if (parseAbsoluteExpression(NumValues))
2559 if (NumValues < 0) {
2561 "'.fill' directive with negative repeat count has no effect");
2565 int64_t FillSize = 1;
2566 int64_t FillExpr = 0;
2568 SMLoc SizeLoc, ExprLoc;
2569 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2570 if (getLexer().isNot(AsmToken::Comma))
2571 return TokError("unexpected token in '.fill' directive");
2574 SizeLoc = getLexer().getLoc();
2575 if (parseAbsoluteExpression(FillSize))
2578 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2579 if (getLexer().isNot(AsmToken::Comma))
2580 return TokError("unexpected token in '.fill' directive");
2583 ExprLoc = getLexer().getLoc();
2584 if (parseAbsoluteExpression(FillExpr))
2587 if (getLexer().isNot(AsmToken::EndOfStatement))
2588 return TokError("unexpected token in '.fill' directive");
2595 Warning(SizeLoc, "'.fill' directive with negative size has no effect");
2599 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
2603 if (!isUInt<32>(FillExpr) && FillSize > 4)
2604 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");
2606 if (NumValues > 0) {
2607 int64_t NonZeroFillSize = FillSize > 4 ? 4 : FillSize;
2608 FillExpr &= ~0ULL >> (64 - NonZeroFillSize * 8);
2609 for (uint64_t i = 0, e = NumValues; i != e; ++i) {
2610 getStreamer().EmitIntValue(FillExpr, NonZeroFillSize);
2611 if (NonZeroFillSize < FillSize)
2612 getStreamer().EmitIntValue(0, FillSize - NonZeroFillSize);
2619 /// parseDirectiveOrg
2620 /// ::= .org expression [ , expression ]
2621 bool AsmParser::parseDirectiveOrg() {
2622 checkForValidSection();
2624 const MCExpr *Offset;
2625 SMLoc Loc = getTok().getLoc();
2626 if (parseExpression(Offset))
2629 // Parse optional fill expression.
2630 int64_t FillExpr = 0;
2631 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2632 if (getLexer().isNot(AsmToken::Comma))
2633 return TokError("unexpected token in '.org' directive");
2636 if (parseAbsoluteExpression(FillExpr))
2639 if (getLexer().isNot(AsmToken::EndOfStatement))
2640 return TokError("unexpected token in '.org' directive");
2645 // Only limited forms of relocatable expressions are accepted here, it
2646 // has to be relative to the current section. The streamer will return
2647 // 'true' if the expression wasn't evaluatable.
2648 if (getStreamer().EmitValueToOffset(Offset, FillExpr))
2649 return Error(Loc, "expected assembly-time absolute expression");
2654 /// parseDirectiveAlign
2655 /// ::= {.align, ...} expression [ , expression [ , expression ]]
2656 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
2657 checkForValidSection();
2659 SMLoc AlignmentLoc = getLexer().getLoc();
2661 if (parseAbsoluteExpression(Alignment))
2665 bool HasFillExpr = false;
2666 int64_t FillExpr = 0;
2667 int64_t MaxBytesToFill = 0;
2668 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2669 if (getLexer().isNot(AsmToken::Comma))
2670 return TokError("unexpected token in directive");
2673 // The fill expression can be omitted while specifying a maximum number of
2674 // alignment bytes, e.g:
2676 if (getLexer().isNot(AsmToken::Comma)) {
2678 if (parseAbsoluteExpression(FillExpr))
2682 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2683 if (getLexer().isNot(AsmToken::Comma))
2684 return TokError("unexpected token in directive");
2687 MaxBytesLoc = getLexer().getLoc();
2688 if (parseAbsoluteExpression(MaxBytesToFill))
2691 if (getLexer().isNot(AsmToken::EndOfStatement))
2692 return TokError("unexpected token in directive");
2701 // Compute alignment in bytes.
2703 // FIXME: Diagnose overflow.
2704 if (Alignment >= 32) {
2705 Error(AlignmentLoc, "invalid alignment value");
2709 Alignment = 1ULL << Alignment;
2711 // Reject alignments that aren't a power of two, for gas compatibility.
2712 if (!isPowerOf2_64(Alignment))
2713 Error(AlignmentLoc, "alignment must be a power of 2");
2716 // Diagnose non-sensical max bytes to align.
2717 if (MaxBytesLoc.isValid()) {
2718 if (MaxBytesToFill < 1) {
2719 Error(MaxBytesLoc, "alignment directive can never be satisfied in this "
2720 "many bytes, ignoring maximum bytes expression");
2724 if (MaxBytesToFill >= Alignment) {
2725 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
2731 // Check whether we should use optimal code alignment for this .align
2733 const MCSection *Section = getStreamer().getCurrentSection().first;
2734 assert(Section && "must have section to emit alignment");
2735 bool UseCodeAlign = Section->UseCodeAlign();
2736 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
2737 ValueSize == 1 && UseCodeAlign) {
2738 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
2740 // FIXME: Target specific behavior about how the "extra" bytes are filled.
2741 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
2748 /// parseDirectiveFile
2749 /// ::= .file [number] filename
2750 /// ::= .file number directory filename
2751 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
2752 // FIXME: I'm not sure what this is.
2753 int64_t FileNumber = -1;
2754 SMLoc FileNumberLoc = getLexer().getLoc();
2755 if (getLexer().is(AsmToken::Integer)) {
2756 FileNumber = getTok().getIntVal();
2760 return TokError("file number less than one");
2763 if (getLexer().isNot(AsmToken::String))
2764 return TokError("unexpected token in '.file' directive");
2766 // Usually the directory and filename together, otherwise just the directory.
2767 // Allow the strings to have escaped octal character sequence.
2768 std::string Path = getTok().getString();
2769 if (parseEscapedString(Path))
2773 StringRef Directory;
2775 std::string FilenameData;
2776 if (getLexer().is(AsmToken::String)) {
2777 if (FileNumber == -1)
2778 return TokError("explicit path specified, but no file number");
2779 if (parseEscapedString(FilenameData))
2781 Filename = FilenameData;
2788 if (getLexer().isNot(AsmToken::EndOfStatement))
2789 return TokError("unexpected token in '.file' directive");
2791 if (FileNumber == -1)
2792 getStreamer().EmitFileDirective(Filename);
2794 if (getContext().getGenDwarfForAssembly() == true)
2796 "input can't have .file dwarf directives when -g is "
2797 "used to generate dwarf debug info for assembly code");
2799 if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename) ==
2801 Error(FileNumberLoc, "file number already allocated");
2807 /// parseDirectiveLine
2808 /// ::= .line [number]
2809 bool AsmParser::parseDirectiveLine() {
2810 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2811 if (getLexer().isNot(AsmToken::Integer))
2812 return TokError("unexpected token in '.line' directive");
2814 int64_t LineNumber = getTok().getIntVal();
2818 // FIXME: Do something with the .line.
2821 if (getLexer().isNot(AsmToken::EndOfStatement))
2822 return TokError("unexpected token in '.line' directive");
2827 /// parseDirectiveLoc
2828 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
2829 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
2830 /// The first number is a file number, must have been previously assigned with
2831 /// a .file directive, the second number is the line number and optionally the
2832 /// third number is a column position (zero if not specified). The remaining
2833 /// optional items are .loc sub-directives.
2834 bool AsmParser::parseDirectiveLoc() {
2835 if (getLexer().isNot(AsmToken::Integer))
2836 return TokError("unexpected token in '.loc' directive");
2837 int64_t FileNumber = getTok().getIntVal();
2839 return TokError("file number less than one in '.loc' directive");
2840 if (!getContext().isValidDwarfFileNumber(FileNumber))
2841 return TokError("unassigned file number in '.loc' directive");
2844 int64_t LineNumber = 0;
2845 if (getLexer().is(AsmToken::Integer)) {
2846 LineNumber = getTok().getIntVal();
2848 return TokError("line number less than zero in '.loc' directive");
2852 int64_t ColumnPos = 0;
2853 if (getLexer().is(AsmToken::Integer)) {
2854 ColumnPos = getTok().getIntVal();
2856 return TokError("column position less than zero in '.loc' directive");
2860 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
2862 int64_t Discriminator = 0;
2863 if (getLexer().isNot(AsmToken::EndOfStatement)) {
2865 if (getLexer().is(AsmToken::EndOfStatement))
2869 SMLoc Loc = getTok().getLoc();
2870 if (parseIdentifier(Name))
2871 return TokError("unexpected token in '.loc' directive");
2873 if (Name == "basic_block")
2874 Flags |= DWARF2_FLAG_BASIC_BLOCK;
2875 else if (Name == "prologue_end")
2876 Flags |= DWARF2_FLAG_PROLOGUE_END;
2877 else if (Name == "epilogue_begin")
2878 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
2879 else if (Name == "is_stmt") {
2880 Loc = getTok().getLoc();
2881 const MCExpr *Value;
2882 if (parseExpression(Value))
2884 // The expression must be the constant 0 or 1.
2885 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2886 int Value = MCE->getValue();
2888 Flags &= ~DWARF2_FLAG_IS_STMT;
2889 else if (Value == 1)
2890 Flags |= DWARF2_FLAG_IS_STMT;
2892 return Error(Loc, "is_stmt value not 0 or 1");
2894 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
2896 } else if (Name == "isa") {
2897 Loc = getTok().getLoc();
2898 const MCExpr *Value;
2899 if (parseExpression(Value))
2901 // The expression must be a constant greater or equal to 0.
2902 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2903 int Value = MCE->getValue();
2905 return Error(Loc, "isa number less than zero");
2908 return Error(Loc, "isa number not a constant value");
2910 } else if (Name == "discriminator") {
2911 if (parseAbsoluteExpression(Discriminator))
2914 return Error(Loc, "unknown sub-directive in '.loc' directive");
2917 if (getLexer().is(AsmToken::EndOfStatement))
2922 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
2923 Isa, Discriminator, StringRef());
2928 /// parseDirectiveStabs
2929 /// ::= .stabs string, number, number, number
2930 bool AsmParser::parseDirectiveStabs() {
2931 return TokError("unsupported directive '.stabs'");
2934 /// parseDirectiveCFISections
2935 /// ::= .cfi_sections section [, section]
2936 bool AsmParser::parseDirectiveCFISections() {
2941 if (parseIdentifier(Name))
2942 return TokError("Expected an identifier");
2944 if (Name == ".eh_frame")
2946 else if (Name == ".debug_frame")
2949 if (getLexer().is(AsmToken::Comma)) {
2952 if (parseIdentifier(Name))
2953 return TokError("Expected an identifier");
2955 if (Name == ".eh_frame")
2957 else if (Name == ".debug_frame")
2961 getStreamer().EmitCFISections(EH, Debug);
2965 /// parseDirectiveCFIStartProc
2966 /// ::= .cfi_startproc [simple]
2967 bool AsmParser::parseDirectiveCFIStartProc() {
2969 if (getLexer().isNot(AsmToken::EndOfStatement))
2970 if (parseIdentifier(Simple) || Simple != "simple")
2971 return TokError("unexpected token in .cfi_startproc directive");
2973 getStreamer().EmitCFIStartProc(!Simple.empty());
2977 /// parseDirectiveCFIEndProc
2978 /// ::= .cfi_endproc
2979 bool AsmParser::parseDirectiveCFIEndProc() {
2980 getStreamer().EmitCFIEndProc();
2984 /// \brief parse register name or number.
2985 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
2986 SMLoc DirectiveLoc) {
2989 if (getLexer().isNot(AsmToken::Integer)) {
2990 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
2992 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
2994 return parseAbsoluteExpression(Register);
2999 /// parseDirectiveCFIDefCfa
3000 /// ::= .cfi_def_cfa register, offset
3001 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
3002 int64_t Register = 0;
3003 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3006 if (getLexer().isNot(AsmToken::Comma))
3007 return TokError("unexpected token in directive");
3011 if (parseAbsoluteExpression(Offset))
3014 getStreamer().EmitCFIDefCfa(Register, Offset);
3018 /// parseDirectiveCFIDefCfaOffset
3019 /// ::= .cfi_def_cfa_offset offset
3020 bool AsmParser::parseDirectiveCFIDefCfaOffset() {
3022 if (parseAbsoluteExpression(Offset))
3025 getStreamer().EmitCFIDefCfaOffset(Offset);
3029 /// parseDirectiveCFIRegister
3030 /// ::= .cfi_register register, register
3031 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
3032 int64_t Register1 = 0;
3033 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc))
3036 if (getLexer().isNot(AsmToken::Comma))
3037 return TokError("unexpected token in directive");
3040 int64_t Register2 = 0;
3041 if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc))
3044 getStreamer().EmitCFIRegister(Register1, Register2);
3048 /// parseDirectiveCFIWindowSave
3049 /// ::= .cfi_window_save
3050 bool AsmParser::parseDirectiveCFIWindowSave() {
3051 getStreamer().EmitCFIWindowSave();
3055 /// parseDirectiveCFIAdjustCfaOffset
3056 /// ::= .cfi_adjust_cfa_offset adjustment
3057 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
3058 int64_t Adjustment = 0;
3059 if (parseAbsoluteExpression(Adjustment))
3062 getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
3066 /// parseDirectiveCFIDefCfaRegister
3067 /// ::= .cfi_def_cfa_register register
3068 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
3069 int64_t Register = 0;
3070 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3073 getStreamer().EmitCFIDefCfaRegister(Register);
3077 /// parseDirectiveCFIOffset
3078 /// ::= .cfi_offset register, offset
3079 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
3080 int64_t Register = 0;
3083 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3086 if (getLexer().isNot(AsmToken::Comma))
3087 return TokError("unexpected token in directive");
3090 if (parseAbsoluteExpression(Offset))
3093 getStreamer().EmitCFIOffset(Register, Offset);
3097 /// parseDirectiveCFIRelOffset
3098 /// ::= .cfi_rel_offset register, offset
3099 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
3100 int64_t Register = 0;
3102 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3105 if (getLexer().isNot(AsmToken::Comma))
3106 return TokError("unexpected token in directive");
3110 if (parseAbsoluteExpression(Offset))
3113 getStreamer().EmitCFIRelOffset(Register, Offset);
3117 static bool isValidEncoding(int64_t Encoding) {
3118 if (Encoding & ~0xff)
3121 if (Encoding == dwarf::DW_EH_PE_omit)
3124 const unsigned Format = Encoding & 0xf;
3125 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
3126 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
3127 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
3128 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
3131 const unsigned Application = Encoding & 0x70;
3132 if (Application != dwarf::DW_EH_PE_absptr &&
3133 Application != dwarf::DW_EH_PE_pcrel)
3139 /// parseDirectiveCFIPersonalityOrLsda
3140 /// IsPersonality true for cfi_personality, false for cfi_lsda
3141 /// ::= .cfi_personality encoding, [symbol_name]
3142 /// ::= .cfi_lsda encoding, [symbol_name]
3143 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
3144 int64_t Encoding = 0;
3145 if (parseAbsoluteExpression(Encoding))
3147 if (Encoding == dwarf::DW_EH_PE_omit)
3150 if (!isValidEncoding(Encoding))
3151 return TokError("unsupported encoding.");
3153 if (getLexer().isNot(AsmToken::Comma))
3154 return TokError("unexpected token in directive");
3158 if (parseIdentifier(Name))
3159 return TokError("expected identifier in directive");
3161 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3164 getStreamer().EmitCFIPersonality(Sym, Encoding);
3166 getStreamer().EmitCFILsda(Sym, Encoding);
3170 /// parseDirectiveCFIRememberState
3171 /// ::= .cfi_remember_state
3172 bool AsmParser::parseDirectiveCFIRememberState() {
3173 getStreamer().EmitCFIRememberState();
3177 /// parseDirectiveCFIRestoreState
3178 /// ::= .cfi_remember_state
3179 bool AsmParser::parseDirectiveCFIRestoreState() {
3180 getStreamer().EmitCFIRestoreState();
3184 /// parseDirectiveCFISameValue
3185 /// ::= .cfi_same_value register
3186 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
3187 int64_t Register = 0;
3189 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3192 getStreamer().EmitCFISameValue(Register);
3196 /// parseDirectiveCFIRestore
3197 /// ::= .cfi_restore register
3198 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
3199 int64_t Register = 0;
3200 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3203 getStreamer().EmitCFIRestore(Register);
3207 /// parseDirectiveCFIEscape
3208 /// ::= .cfi_escape expression[,...]
3209 bool AsmParser::parseDirectiveCFIEscape() {
3212 if (parseAbsoluteExpression(CurrValue))
3215 Values.push_back((uint8_t)CurrValue);
3217 while (getLexer().is(AsmToken::Comma)) {
3220 if (parseAbsoluteExpression(CurrValue))
3223 Values.push_back((uint8_t)CurrValue);
3226 getStreamer().EmitCFIEscape(Values);
3230 /// parseDirectiveCFISignalFrame
3231 /// ::= .cfi_signal_frame
3232 bool AsmParser::parseDirectiveCFISignalFrame() {
3233 if (getLexer().isNot(AsmToken::EndOfStatement))
3234 return Error(getLexer().getLoc(),
3235 "unexpected token in '.cfi_signal_frame'");
3237 getStreamer().EmitCFISignalFrame();
3241 /// parseDirectiveCFIUndefined
3242 /// ::= .cfi_undefined register
3243 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
3244 int64_t Register = 0;
3246 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
3249 getStreamer().EmitCFIUndefined(Register);
3253 /// parseDirectiveMacrosOnOff
3256 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
3257 if (getLexer().isNot(AsmToken::EndOfStatement))
3258 return Error(getLexer().getLoc(),
3259 "unexpected token in '" + Directive + "' directive");
3261 setMacrosEnabled(Directive == ".macros_on");
3265 /// parseDirectiveMacro
3266 /// ::= .macro name[,] [parameters]
3267 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
3269 if (parseIdentifier(Name))
3270 return TokError("expected identifier in '.macro' directive");
3272 if (getLexer().is(AsmToken::Comma))
3275 MCAsmMacroParameters Parameters;
3276 while (getLexer().isNot(AsmToken::EndOfStatement)) {
3278 if (!Parameters.empty() && Parameters.back().Vararg)
3279 return Error(Lexer.getLoc(),
3280 "Vararg parameter '" + Parameters.back().Name +
3281 "' should be last one in the list of parameters.");
3283 MCAsmMacroParameter Parameter;
3284 if (parseIdentifier(Parameter.Name))
3285 return TokError("expected identifier in '.macro' directive");
3287 if (Lexer.is(AsmToken::Colon)) {
3288 Lex(); // consume ':'
3291 StringRef Qualifier;
3293 QualLoc = Lexer.getLoc();
3294 if (parseIdentifier(Qualifier))
3295 return Error(QualLoc, "missing parameter qualifier for "
3296 "'" + Parameter.Name + "' in macro '" + Name + "'");
3298 if (Qualifier == "req")
3299 Parameter.Required = true;
3300 else if (Qualifier == "vararg")
3301 Parameter.Vararg = true;
3303 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier "
3304 "for '" + Parameter.Name + "' in macro '" + Name + "'");
3307 if (getLexer().is(AsmToken::Equal)) {
3312 ParamLoc = Lexer.getLoc();
3313 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false ))
3316 if (Parameter.Required)
3317 Warning(ParamLoc, "pointless default value for required parameter "
3318 "'" + Parameter.Name + "' in macro '" + Name + "'");
3321 Parameters.push_back(std::move(Parameter));
3323 if (getLexer().is(AsmToken::Comma))
3327 // Eat the end of statement.
3330 AsmToken EndToken, StartToken = getTok();
3331 unsigned MacroDepth = 0;
3333 // Lex the macro definition.
3335 // Check whether we have reached the end of the file.
3336 if (getLexer().is(AsmToken::Eof))
3337 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
3339 // Otherwise, check whether we have reach the .endmacro.
3340 if (getLexer().is(AsmToken::Identifier)) {
3341 if (getTok().getIdentifier() == ".endm" ||
3342 getTok().getIdentifier() == ".endmacro") {
3343 if (MacroDepth == 0) { // Outermost macro.
3344 EndToken = getTok();
3346 if (getLexer().isNot(AsmToken::EndOfStatement))
3347 return TokError("unexpected token in '" + EndToken.getIdentifier() +
3351 // Otherwise we just found the end of an inner macro.
3354 } else if (getTok().getIdentifier() == ".macro") {
3355 // We allow nested macros. Those aren't instantiated until the outermost
3356 // macro is expanded so just ignore them for now.
3361 // Otherwise, scan til the end of the statement.
3362 eatToEndOfStatement();
3365 if (lookupMacro(Name)) {
3366 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
3369 const char *BodyStart = StartToken.getLoc().getPointer();
3370 const char *BodyEnd = EndToken.getLoc().getPointer();
3371 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
3372 checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
3373 defineMacro(Name, MCAsmMacro(Name, Body, std::move(Parameters)));
3377 /// checkForBadMacro
3379 /// With the support added for named parameters there may be code out there that
3380 /// is transitioning from positional parameters. In versions of gas that did
3381 /// not support named parameters they would be ignored on the macro definition.
3382 /// But to support both styles of parameters this is not possible so if a macro
3383 /// definition has named parameters but does not use them and has what appears
3384 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
3385 /// warning that the positional parameter found in body which have no effect.
3386 /// Hoping the developer will either remove the named parameters from the macro
3387 /// definition so the positional parameters get used if that was what was
3388 /// intended or change the macro to use the named parameters. It is possible
3389 /// this warning will trigger when the none of the named parameters are used
3390 /// and the strings like $1 are infact to simply to be passed trough unchanged.
3391 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
3393 ArrayRef<MCAsmMacroParameter> Parameters) {
3394 // If this macro is not defined with named parameters the warning we are
3395 // checking for here doesn't apply.
3396 unsigned NParameters = Parameters.size();
3397 if (NParameters == 0)
3400 bool NamedParametersFound = false;
3401 bool PositionalParametersFound = false;
3403 // Look at the body of the macro for use of both the named parameters and what
3404 // are likely to be positional parameters. This is what expandMacro() is
3405 // doing when it finds the parameters in the body.
3406 while (!Body.empty()) {
3407 // Scan for the next possible parameter.
3408 std::size_t End = Body.size(), Pos = 0;
3409 for (; Pos != End; ++Pos) {
3410 // Check for a substitution or escape.
3411 // This macro is defined with parameters, look for \foo, \bar, etc.
3412 if (Body[Pos] == '\\' && Pos + 1 != End)
3415 // This macro should have parameters, but look for $0, $1, ..., $n too.
3416 if (Body[Pos] != '$' || Pos + 1 == End)
3418 char Next = Body[Pos + 1];
3419 if (Next == '$' || Next == 'n' ||
3420 isdigit(static_cast<unsigned char>(Next)))
3424 // Check if we reached the end.
3428 if (Body[Pos] == '$') {
3429 switch (Body[Pos + 1]) {
3434 // $n => number of arguments
3436 PositionalParametersFound = true;
3439 // $[0-9] => argument
3441 PositionalParametersFound = true;
3447 unsigned I = Pos + 1;
3448 while (isIdentifierChar(Body[I]) && I + 1 != End)
3451 const char *Begin = Body.data() + Pos + 1;
3452 StringRef Argument(Begin, I - (Pos + 1));
3454 for (; Index < NParameters; ++Index)
3455 if (Parameters[Index].Name == Argument)
3458 if (Index == NParameters) {
3459 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
3465 NamedParametersFound = true;
3466 Pos += 1 + Argument.size();
3469 // Update the scan point.
3470 Body = Body.substr(Pos);
3473 if (!NamedParametersFound && PositionalParametersFound)
3474 Warning(DirectiveLoc, "macro defined with named parameters which are not "
3475 "used in macro body, possible positional parameter "
3476 "found in body which will have no effect");
3479 /// parseDirectiveExitMacro
3481 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) {
3482 if (getLexer().isNot(AsmToken::EndOfStatement))
3483 return TokError("unexpected token in '" + Directive + "' directive");
3485 if (!isInsideMacroInstantiation())
3486 return TokError("unexpected '" + Directive + "' in file, "
3487 "no current macro definition");
3489 // Exit all conditionals that are active in the current macro.
3490 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) {
3491 TheCondState = TheCondStack.back();
3492 TheCondStack.pop_back();
3499 /// parseDirectiveEndMacro
3502 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
3503 if (getLexer().isNot(AsmToken::EndOfStatement))
3504 return TokError("unexpected token in '" + Directive + "' directive");
3506 // If we are inside a macro instantiation, terminate the current
3508 if (isInsideMacroInstantiation()) {
3513 // Otherwise, this .endmacro is a stray entry in the file; well formed
3514 // .endmacro directives are handled during the macro definition parsing.
3515 return TokError("unexpected '" + Directive + "' in file, "
3516 "no current macro definition");
3519 /// parseDirectivePurgeMacro
3521 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
3523 if (parseIdentifier(Name))
3524 return TokError("expected identifier in '.purgem' directive");
3526 if (getLexer().isNot(AsmToken::EndOfStatement))
3527 return TokError("unexpected token in '.purgem' directive");
3529 if (!lookupMacro(Name))
3530 return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
3532 undefineMacro(Name);
3536 /// parseDirectiveBundleAlignMode
3537 /// ::= {.bundle_align_mode} expression
3538 bool AsmParser::parseDirectiveBundleAlignMode() {
3539 checkForValidSection();
3541 // Expect a single argument: an expression that evaluates to a constant
3542 // in the inclusive range 0-30.
3543 SMLoc ExprLoc = getLexer().getLoc();
3544 int64_t AlignSizePow2;
3545 if (parseAbsoluteExpression(AlignSizePow2))
3547 else if (getLexer().isNot(AsmToken::EndOfStatement))
3548 return TokError("unexpected token after expression in"
3549 " '.bundle_align_mode' directive");
3550 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30)
3551 return Error(ExprLoc,
3552 "invalid bundle alignment size (expected between 0 and 30)");
3556 // Because of AlignSizePow2's verified range we can safely truncate it to
3558 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
3562 /// parseDirectiveBundleLock
3563 /// ::= {.bundle_lock} [align_to_end]
3564 bool AsmParser::parseDirectiveBundleLock() {
3565 checkForValidSection();
3566 bool AlignToEnd = false;
3568 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3570 SMLoc Loc = getTok().getLoc();
3571 const char *kInvalidOptionError =
3572 "invalid option for '.bundle_lock' directive";
3574 if (parseIdentifier(Option))
3575 return Error(Loc, kInvalidOptionError);
3577 if (Option != "align_to_end")
3578 return Error(Loc, kInvalidOptionError);
3579 else if (getLexer().isNot(AsmToken::EndOfStatement))
3581 "unexpected token after '.bundle_lock' directive option");
3587 getStreamer().EmitBundleLock(AlignToEnd);
3591 /// parseDirectiveBundleLock
3592 /// ::= {.bundle_lock}
3593 bool AsmParser::parseDirectiveBundleUnlock() {
3594 checkForValidSection();
3596 if (getLexer().isNot(AsmToken::EndOfStatement))
3597 return TokError("unexpected token in '.bundle_unlock' directive");
3600 getStreamer().EmitBundleUnlock();
3604 /// parseDirectiveSpace
3605 /// ::= (.skip | .space) expression [ , expression ]
3606 bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
3607 checkForValidSection();
3610 if (parseAbsoluteExpression(NumBytes))
3613 int64_t FillExpr = 0;
3614 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3615 if (getLexer().isNot(AsmToken::Comma))
3616 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3619 if (parseAbsoluteExpression(FillExpr))
3622 if (getLexer().isNot(AsmToken::EndOfStatement))
3623 return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
3629 return TokError("invalid number of bytes in '" + Twine(IDVal) +
3632 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
3633 getStreamer().EmitFill(NumBytes, FillExpr);
3638 /// parseDirectiveLEB128
3639 /// ::= (.sleb128 | .uleb128) expression
3640 bool AsmParser::parseDirectiveLEB128(bool Signed) {
3641 checkForValidSection();
3642 const MCExpr *Value;
3644 if (parseExpression(Value))
3647 if (getLexer().isNot(AsmToken::EndOfStatement))
3648 return TokError("unexpected token in directive");
3651 getStreamer().EmitSLEB128Value(Value);
3653 getStreamer().EmitULEB128Value(Value);
3658 /// parseDirectiveSymbolAttribute
3659 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
3660 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
3661 if (getLexer().isNot(AsmToken::EndOfStatement)) {
3664 SMLoc Loc = getTok().getLoc();
3666 if (parseIdentifier(Name))
3667 return Error(Loc, "expected identifier in directive");
3669 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3671 // Assembler local symbols don't make any sense here. Complain loudly.
3672 if (Sym->isTemporary())
3673 return Error(Loc, "non-local symbol required in directive");
3675 if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
3676 return Error(Loc, "unable to emit symbol attribute");
3678 if (getLexer().is(AsmToken::EndOfStatement))
3681 if (getLexer().isNot(AsmToken::Comma))
3682 return TokError("unexpected token in directive");
3691 /// parseDirectiveComm
3692 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
3693 bool AsmParser::parseDirectiveComm(bool IsLocal) {
3694 checkForValidSection();
3696 SMLoc IDLoc = getLexer().getLoc();
3698 if (parseIdentifier(Name))
3699 return TokError("expected identifier in directive");
3701 // Handle the identifier as the key symbol.
3702 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
3704 if (getLexer().isNot(AsmToken::Comma))
3705 return TokError("unexpected token in directive");
3709 SMLoc SizeLoc = getLexer().getLoc();
3710 if (parseAbsoluteExpression(Size))
3713 int64_t Pow2Alignment = 0;
3714 SMLoc Pow2AlignmentLoc;
3715 if (getLexer().is(AsmToken::Comma)) {
3717 Pow2AlignmentLoc = getLexer().getLoc();
3718 if (parseAbsoluteExpression(Pow2Alignment))
3721 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
3722 if (IsLocal && LCOMM == LCOMM::NoAlignment)
3723 return Error(Pow2AlignmentLoc, "alignment not supported on this target");
3725 // If this target takes alignments in bytes (not log) validate and convert.
3726 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
3727 (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
3728 if (!isPowerOf2_64(Pow2Alignment))
3729 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
3730 Pow2Alignment = Log2_64(Pow2Alignment);
3734 if (getLexer().isNot(AsmToken::EndOfStatement))
3735 return TokError("unexpected token in '.comm' or '.lcomm' directive");
3739 // NOTE: a size of zero for a .comm should create a undefined symbol
3740 // but a size of .lcomm creates a bss symbol of size zero.
3742 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
3743 "be less than zero");
3745 // NOTE: The alignment in the directive is a power of 2 value, the assembler
3746 // may internally end up wanting an alignment in bytes.
3747 // FIXME: Diagnose overflow.
3748 if (Pow2Alignment < 0)
3749 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
3750 "alignment, can't be less than zero");
3752 if (!Sym->isUndefined())
3753 return Error(IDLoc, "invalid symbol redefinition");
3755 // Create the Symbol as a common or local common with Size and Pow2Alignment
3757 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3761 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
3765 /// parseDirectiveAbort
3766 /// ::= .abort [... message ...]
3767 bool AsmParser::parseDirectiveAbort() {
3768 // FIXME: Use loc from directive.
3769 SMLoc Loc = getLexer().getLoc();
3771 StringRef Str = parseStringToEndOfStatement();
3772 if (getLexer().isNot(AsmToken::EndOfStatement))
3773 return TokError("unexpected token in '.abort' directive");
3778 Error(Loc, ".abort detected. Assembly stopping.");
3780 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
3781 // FIXME: Actually abort assembly here.
3786 /// parseDirectiveInclude
3787 /// ::= .include "filename"
3788 bool AsmParser::parseDirectiveInclude() {
3789 if (getLexer().isNot(AsmToken::String))
3790 return TokError("expected string in '.include' directive");
3792 // Allow the strings to have escaped octal character sequence.
3793 std::string Filename;
3794 if (parseEscapedString(Filename))
3796 SMLoc IncludeLoc = getLexer().getLoc();
3799 if (getLexer().isNot(AsmToken::EndOfStatement))
3800 return TokError("unexpected token in '.include' directive");
3802 // Attempt to switch the lexer to the included file before consuming the end
3803 // of statement to avoid losing it when we switch.
3804 if (enterIncludeFile(Filename)) {
3805 Error(IncludeLoc, "Could not find include file '" + Filename + "'");
3812 /// parseDirectiveIncbin
3813 /// ::= .incbin "filename"
3814 bool AsmParser::parseDirectiveIncbin() {
3815 if (getLexer().isNot(AsmToken::String))
3816 return TokError("expected string in '.incbin' directive");
3818 // Allow the strings to have escaped octal character sequence.
3819 std::string Filename;
3820 if (parseEscapedString(Filename))
3822 SMLoc IncbinLoc = getLexer().getLoc();
3825 if (getLexer().isNot(AsmToken::EndOfStatement))
3826 return TokError("unexpected token in '.incbin' directive");
3828 // Attempt to process the included file.
3829 if (processIncbinFile(Filename)) {
3830 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
3837 /// parseDirectiveIf
3838 /// ::= .if{,eq,ge,gt,le,lt,ne} expression
3839 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) {
3840 TheCondStack.push_back(TheCondState);
3841 TheCondState.TheCond = AsmCond::IfCond;
3842 if (TheCondState.Ignore) {
3843 eatToEndOfStatement();
3846 if (parseAbsoluteExpression(ExprValue))
3849 if (getLexer().isNot(AsmToken::EndOfStatement))
3850 return TokError("unexpected token in '.if' directive");
3856 llvm_unreachable("unsupported directive");
3861 ExprValue = ExprValue == 0;
3864 ExprValue = ExprValue >= 0;
3867 ExprValue = ExprValue > 0;
3870 ExprValue = ExprValue <= 0;
3873 ExprValue = ExprValue < 0;
3877 TheCondState.CondMet = ExprValue;
3878 TheCondState.Ignore = !TheCondState.CondMet;
3884 /// parseDirectiveIfb
3886 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
3887 TheCondStack.push_back(TheCondState);
3888 TheCondState.TheCond = AsmCond::IfCond;
3890 if (TheCondState.Ignore) {
3891 eatToEndOfStatement();
3893 StringRef Str = parseStringToEndOfStatement();
3895 if (getLexer().isNot(AsmToken::EndOfStatement))
3896 return TokError("unexpected token in '.ifb' directive");
3900 TheCondState.CondMet = ExpectBlank == Str.empty();
3901 TheCondState.Ignore = !TheCondState.CondMet;
3907 /// parseDirectiveIfc
3908 /// ::= .ifc string1, string2
3909 /// ::= .ifnc string1, string2
3910 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
3911 TheCondStack.push_back(TheCondState);
3912 TheCondState.TheCond = AsmCond::IfCond;
3914 if (TheCondState.Ignore) {
3915 eatToEndOfStatement();
3917 StringRef Str1 = parseStringToComma();
3919 if (getLexer().isNot(AsmToken::Comma))
3920 return TokError("unexpected token in '.ifc' directive");
3924 StringRef Str2 = parseStringToEndOfStatement();
3926 if (getLexer().isNot(AsmToken::EndOfStatement))
3927 return TokError("unexpected token in '.ifc' directive");
3931 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim());
3932 TheCondState.Ignore = !TheCondState.CondMet;
3938 /// parseDirectiveIfeqs
3939 /// ::= .ifeqs string1, string2
3940 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc) {
3941 if (Lexer.isNot(AsmToken::String)) {
3942 TokError("expected string parameter for '.ifeqs' directive");
3943 eatToEndOfStatement();
3947 StringRef String1 = getTok().getStringContents();
3950 if (Lexer.isNot(AsmToken::Comma)) {
3951 TokError("expected comma after first string for '.ifeqs' directive");
3952 eatToEndOfStatement();
3958 if (Lexer.isNot(AsmToken::String)) {
3959 TokError("expected string parameter for '.ifeqs' directive");
3960 eatToEndOfStatement();
3964 StringRef String2 = getTok().getStringContents();
3967 TheCondStack.push_back(TheCondState);
3968 TheCondState.TheCond = AsmCond::IfCond;
3969 TheCondState.CondMet = String1 == String2;
3970 TheCondState.Ignore = !TheCondState.CondMet;
3975 /// parseDirectiveIfdef
3976 /// ::= .ifdef symbol
3977 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
3979 TheCondStack.push_back(TheCondState);
3980 TheCondState.TheCond = AsmCond::IfCond;
3982 if (TheCondState.Ignore) {
3983 eatToEndOfStatement();
3985 if (parseIdentifier(Name))
3986 return TokError("expected identifier after '.ifdef'");
3990 MCSymbol *Sym = getContext().LookupSymbol(Name);
3993 TheCondState.CondMet = (Sym && !Sym->isUndefined());
3995 TheCondState.CondMet = (!Sym || Sym->isUndefined());
3996 TheCondState.Ignore = !TheCondState.CondMet;
4002 /// parseDirectiveElseIf
4003 /// ::= .elseif expression
4004 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
4005 if (TheCondState.TheCond != AsmCond::IfCond &&
4006 TheCondState.TheCond != AsmCond::ElseIfCond)
4007 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or "
4009 TheCondState.TheCond = AsmCond::ElseIfCond;
4011 bool LastIgnoreState = false;
4012 if (!TheCondStack.empty())
4013 LastIgnoreState = TheCondStack.back().Ignore;
4014 if (LastIgnoreState || TheCondState.CondMet) {
4015 TheCondState.Ignore = true;
4016 eatToEndOfStatement();
4019 if (parseAbsoluteExpression(ExprValue))
4022 if (getLexer().isNot(AsmToken::EndOfStatement))
4023 return TokError("unexpected token in '.elseif' directive");
4026 TheCondState.CondMet = ExprValue;
4027 TheCondState.Ignore = !TheCondState.CondMet;
4033 /// parseDirectiveElse
4035 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
4036 if (getLexer().isNot(AsmToken::EndOfStatement))
4037 return TokError("unexpected token in '.else' directive");
4041 if (TheCondState.TheCond != AsmCond::IfCond &&
4042 TheCondState.TheCond != AsmCond::ElseIfCond)
4043 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an "
4045 TheCondState.TheCond = AsmCond::ElseCond;
4046 bool LastIgnoreState = false;
4047 if (!TheCondStack.empty())
4048 LastIgnoreState = TheCondStack.back().Ignore;
4049 if (LastIgnoreState || TheCondState.CondMet)
4050 TheCondState.Ignore = true;
4052 TheCondState.Ignore = false;
4057 /// parseDirectiveEnd
4059 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) {
4060 if (getLexer().isNot(AsmToken::EndOfStatement))
4061 return TokError("unexpected token in '.end' directive");
4065 while (Lexer.isNot(AsmToken::Eof))
4071 /// parseDirectiveError
4073 /// ::= .error [string]
4074 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) {
4075 if (!TheCondStack.empty()) {
4076 if (TheCondStack.back().Ignore) {
4077 eatToEndOfStatement();
4083 return Error(L, ".err encountered");
4085 StringRef Message = ".error directive invoked in source file";
4086 if (Lexer.isNot(AsmToken::EndOfStatement)) {
4087 if (Lexer.isNot(AsmToken::String)) {
4088 TokError(".error argument must be a string");
4089 eatToEndOfStatement();
4093 Message = getTok().getStringContents();
4101 /// parseDirectiveWarning
4102 /// ::= .warning [string]
4103 bool AsmParser::parseDirectiveWarning(SMLoc L) {
4104 if (!TheCondStack.empty()) {
4105 if (TheCondStack.back().Ignore) {
4106 eatToEndOfStatement();
4111 StringRef Message = ".warning directive invoked in source file";
4112 if (Lexer.isNot(AsmToken::EndOfStatement)) {
4113 if (Lexer.isNot(AsmToken::String)) {
4114 TokError(".warning argument must be a string");
4115 eatToEndOfStatement();
4119 Message = getTok().getStringContents();
4123 Warning(L, Message);
4127 /// parseDirectiveEndIf
4129 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
4130 if (getLexer().isNot(AsmToken::EndOfStatement))
4131 return TokError("unexpected token in '.endif' directive");
4135 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
4136 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or "
4138 if (!TheCondStack.empty()) {
4139 TheCondState = TheCondStack.back();
4140 TheCondStack.pop_back();
4146 void AsmParser::initializeDirectiveKindMap() {
4147 DirectiveKindMap[".set"] = DK_SET;
4148 DirectiveKindMap[".equ"] = DK_EQU;
4149 DirectiveKindMap[".equiv"] = DK_EQUIV;
4150 DirectiveKindMap[".ascii"] = DK_ASCII;
4151 DirectiveKindMap[".asciz"] = DK_ASCIZ;
4152 DirectiveKindMap[".string"] = DK_STRING;
4153 DirectiveKindMap[".byte"] = DK_BYTE;
4154 DirectiveKindMap[".short"] = DK_SHORT;
4155 DirectiveKindMap[".value"] = DK_VALUE;
4156 DirectiveKindMap[".2byte"] = DK_2BYTE;
4157 DirectiveKindMap[".long"] = DK_LONG;
4158 DirectiveKindMap[".int"] = DK_INT;
4159 DirectiveKindMap[".4byte"] = DK_4BYTE;
4160 DirectiveKindMap[".quad"] = DK_QUAD;
4161 DirectiveKindMap[".8byte"] = DK_8BYTE;
4162 DirectiveKindMap[".octa"] = DK_OCTA;
4163 DirectiveKindMap[".single"] = DK_SINGLE;
4164 DirectiveKindMap[".float"] = DK_FLOAT;
4165 DirectiveKindMap[".double"] = DK_DOUBLE;
4166 DirectiveKindMap[".align"] = DK_ALIGN;
4167 DirectiveKindMap[".align32"] = DK_ALIGN32;
4168 DirectiveKindMap[".balign"] = DK_BALIGN;
4169 DirectiveKindMap[".balignw"] = DK_BALIGNW;
4170 DirectiveKindMap[".balignl"] = DK_BALIGNL;
4171 DirectiveKindMap[".p2align"] = DK_P2ALIGN;
4172 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
4173 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
4174 DirectiveKindMap[".org"] = DK_ORG;
4175 DirectiveKindMap[".fill"] = DK_FILL;
4176 DirectiveKindMap[".zero"] = DK_ZERO;
4177 DirectiveKindMap[".extern"] = DK_EXTERN;
4178 DirectiveKindMap[".globl"] = DK_GLOBL;
4179 DirectiveKindMap[".global"] = DK_GLOBAL;
4180 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
4181 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
4182 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
4183 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
4184 DirectiveKindMap[".reference"] = DK_REFERENCE;
4185 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
4186 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
4187 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
4188 DirectiveKindMap[".comm"] = DK_COMM;
4189 DirectiveKindMap[".common"] = DK_COMMON;
4190 DirectiveKindMap[".lcomm"] = DK_LCOMM;
4191 DirectiveKindMap[".abort"] = DK_ABORT;
4192 DirectiveKindMap[".include"] = DK_INCLUDE;
4193 DirectiveKindMap[".incbin"] = DK_INCBIN;
4194 DirectiveKindMap[".code16"] = DK_CODE16;
4195 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
4196 DirectiveKindMap[".rept"] = DK_REPT;
4197 DirectiveKindMap[".rep"] = DK_REPT;
4198 DirectiveKindMap[".irp"] = DK_IRP;
4199 DirectiveKindMap[".irpc"] = DK_IRPC;
4200 DirectiveKindMap[".endr"] = DK_ENDR;
4201 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
4202 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
4203 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
4204 DirectiveKindMap[".if"] = DK_IF;
4205 DirectiveKindMap[".ifeq"] = DK_IFEQ;
4206 DirectiveKindMap[".ifge"] = DK_IFGE;
4207 DirectiveKindMap[".ifgt"] = DK_IFGT;
4208 DirectiveKindMap[".ifle"] = DK_IFLE;
4209 DirectiveKindMap[".iflt"] = DK_IFLT;
4210 DirectiveKindMap[".ifne"] = DK_IFNE;
4211 DirectiveKindMap[".ifb"] = DK_IFB;
4212 DirectiveKindMap[".ifnb"] = DK_IFNB;
4213 DirectiveKindMap[".ifc"] = DK_IFC;
4214 DirectiveKindMap[".ifeqs"] = DK_IFEQS;
4215 DirectiveKindMap[".ifnc"] = DK_IFNC;
4216 DirectiveKindMap[".ifdef"] = DK_IFDEF;
4217 DirectiveKindMap[".ifndef"] = DK_IFNDEF;
4218 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
4219 DirectiveKindMap[".elseif"] = DK_ELSEIF;
4220 DirectiveKindMap[".else"] = DK_ELSE;
4221 DirectiveKindMap[".end"] = DK_END;
4222 DirectiveKindMap[".endif"] = DK_ENDIF;
4223 DirectiveKindMap[".skip"] = DK_SKIP;
4224 DirectiveKindMap[".space"] = DK_SPACE;
4225 DirectiveKindMap[".file"] = DK_FILE;
4226 DirectiveKindMap[".line"] = DK_LINE;
4227 DirectiveKindMap[".loc"] = DK_LOC;
4228 DirectiveKindMap[".stabs"] = DK_STABS;
4229 DirectiveKindMap[".sleb128"] = DK_SLEB128;
4230 DirectiveKindMap[".uleb128"] = DK_ULEB128;
4231 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
4232 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
4233 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
4234 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
4235 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
4236 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
4237 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
4238 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
4239 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
4240 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
4241 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
4242 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
4243 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
4244 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
4245 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
4246 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
4247 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
4248 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
4249 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
4250 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
4251 DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
4252 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
4253 DirectiveKindMap[".macro"] = DK_MACRO;
4254 DirectiveKindMap[".exitm"] = DK_EXITM;
4255 DirectiveKindMap[".endm"] = DK_ENDM;
4256 DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
4257 DirectiveKindMap[".purgem"] = DK_PURGEM;
4258 DirectiveKindMap[".err"] = DK_ERR;
4259 DirectiveKindMap[".error"] = DK_ERROR;
4260 DirectiveKindMap[".warning"] = DK_WARNING;
4263 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
4264 AsmToken EndToken, StartToken = getTok();
4266 unsigned NestLevel = 0;
4268 // Check whether we have reached the end of the file.
4269 if (getLexer().is(AsmToken::Eof)) {
4270 Error(DirectiveLoc, "no matching '.endr' in definition");
4274 if (Lexer.is(AsmToken::Identifier) &&
4275 (getTok().getIdentifier() == ".rept")) {
4279 // Otherwise, check whether we have reached the .endr.
4280 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
4281 if (NestLevel == 0) {
4282 EndToken = getTok();
4284 if (Lexer.isNot(AsmToken::EndOfStatement)) {
4285 TokError("unexpected token in '.endr' directive");
4293 // Otherwise, scan till the end of the statement.
4294 eatToEndOfStatement();
4297 const char *BodyStart = StartToken.getLoc().getPointer();
4298 const char *BodyEnd = EndToken.getLoc().getPointer();
4299 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
4301 // We Are Anonymous.
4302 MacroLikeBodies.push_back(
4303 MCAsmMacro(StringRef(), Body, MCAsmMacroParameters()));
4304 return &MacroLikeBodies.back();
4307 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
4308 raw_svector_ostream &OS) {
4311 std::unique_ptr<MemoryBuffer> Instantiation =
4312 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
4314 // Create the macro instantiation object and add to the current macro
4315 // instantiation stack.
4316 MacroInstantiation *MI = new MacroInstantiation(
4317 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
4318 ActiveMacros.push_back(MI);
4320 // Jump to the macro instantiation and prime the lexer.
4321 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
4322 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
4326 /// parseDirectiveRept
4327 /// ::= .rep | .rept count
4328 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) {
4329 const MCExpr *CountExpr;
4330 SMLoc CountLoc = getTok().getLoc();
4331 if (parseExpression(CountExpr))
4335 if (!CountExpr->EvaluateAsAbsolute(Count)) {
4336 eatToEndOfStatement();
4337 return Error(CountLoc, "unexpected token in '" + Dir + "' directive");
4341 return Error(CountLoc, "Count is negative");
4343 if (Lexer.isNot(AsmToken::EndOfStatement))
4344 return TokError("unexpected token in '" + Dir + "' directive");
4346 // Eat the end of statement.
4349 // Lex the rept definition.
4350 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4354 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4355 // to hold the macro body with substitutions.
4356 SmallString<256> Buf;
4357 raw_svector_ostream OS(Buf);
4359 if (expandMacro(OS, M->Body, None, None, getTok().getLoc()))
4362 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4367 /// parseDirectiveIrp
4368 /// ::= .irp symbol,values
4369 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
4370 MCAsmMacroParameter Parameter;
4372 if (parseIdentifier(Parameter.Name))
4373 return TokError("expected identifier in '.irp' directive");
4375 if (Lexer.isNot(AsmToken::Comma))
4376 return TokError("expected comma in '.irp' directive");
4380 MCAsmMacroArguments A;
4381 if (parseMacroArguments(nullptr, A))
4384 // Eat the end of statement.
4387 // Lex the irp definition.
4388 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4392 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4393 // to hold the macro body with substitutions.
4394 SmallString<256> Buf;
4395 raw_svector_ostream OS(Buf);
4397 for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
4398 if (expandMacro(OS, M->Body, Parameter, *i, getTok().getLoc()))
4402 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4407 /// parseDirectiveIrpc
4408 /// ::= .irpc symbol,values
4409 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
4410 MCAsmMacroParameter Parameter;
4412 if (parseIdentifier(Parameter.Name))
4413 return TokError("expected identifier in '.irpc' directive");
4415 if (Lexer.isNot(AsmToken::Comma))
4416 return TokError("expected comma in '.irpc' directive");
4420 MCAsmMacroArguments A;
4421 if (parseMacroArguments(nullptr, A))
4424 if (A.size() != 1 || A.front().size() != 1)
4425 return TokError("unexpected token in '.irpc' directive");
4427 // Eat the end of statement.
4430 // Lex the irpc definition.
4431 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
4435 // Macro instantiation is lexical, unfortunately. We construct a new buffer
4436 // to hold the macro body with substitutions.
4437 SmallString<256> Buf;
4438 raw_svector_ostream OS(Buf);
4440 StringRef Values = A.front().front().getString();
4441 for (std::size_t I = 0, End = Values.size(); I != End; ++I) {
4442 MCAsmMacroArgument Arg;
4443 Arg.push_back(AsmToken(AsmToken::Identifier, Values.slice(I, I + 1)));
4445 if (expandMacro(OS, M->Body, Parameter, Arg, getTok().getLoc()))
4449 instantiateMacroLikeBody(M, DirectiveLoc, OS);
4454 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
4455 if (ActiveMacros.empty())
4456 return TokError("unmatched '.endr' directive");
4458 // The only .repl that should get here are the ones created by
4459 // instantiateMacroLikeBody.
4460 assert(getLexer().is(AsmToken::EndOfStatement));
4466 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
4468 const MCExpr *Value;
4469 SMLoc ExprLoc = getLexer().getLoc();
4470 if (parseExpression(Value))
4472 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4474 return Error(ExprLoc, "unexpected expression in _emit");
4475 uint64_t IntValue = MCE->getValue();
4476 if (!isUIntN(8, IntValue) && !isIntN(8, IntValue))
4477 return Error(ExprLoc, "literal value out of range for directive");
4479 Info.AsmRewrites->push_back(AsmRewrite(AOK_Emit, IDLoc, Len));
4483 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
4484 const MCExpr *Value;
4485 SMLoc ExprLoc = getLexer().getLoc();
4486 if (parseExpression(Value))
4488 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
4490 return Error(ExprLoc, "unexpected expression in align");
4491 uint64_t IntValue = MCE->getValue();
4492 if (!isPowerOf2_64(IntValue))
4493 return Error(ExprLoc, "literal value not a power of two greater then zero");
4495 Info.AsmRewrites->push_back(
4496 AsmRewrite(AOK_Align, IDLoc, 5, Log2_64(IntValue)));
4500 // We are comparing pointers, but the pointers are relative to a single string.
4501 // Thus, this should always be deterministic.
4502 static int rewritesSort(const AsmRewrite *AsmRewriteA,
4503 const AsmRewrite *AsmRewriteB) {
4504 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
4506 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
4509 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
4510 // rewrite to the same location. Make sure the SizeDirective rewrite is
4511 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
4512 // ensures the sort algorithm is stable.
4513 if (AsmRewritePrecedence[AsmRewriteA->Kind] >
4514 AsmRewritePrecedence[AsmRewriteB->Kind])
4517 if (AsmRewritePrecedence[AsmRewriteA->Kind] <
4518 AsmRewritePrecedence[AsmRewriteB->Kind])
4520 llvm_unreachable("Unstable rewrite sort.");
4523 bool AsmParser::parseMSInlineAsm(
4524 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
4525 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls,
4526 SmallVectorImpl<std::string> &Constraints,
4527 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
4528 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
4529 SmallVector<void *, 4> InputDecls;
4530 SmallVector<void *, 4> OutputDecls;
4531 SmallVector<bool, 4> InputDeclsAddressOf;
4532 SmallVector<bool, 4> OutputDeclsAddressOf;
4533 SmallVector<std::string, 4> InputConstraints;
4534 SmallVector<std::string, 4> OutputConstraints;
4535 SmallVector<unsigned, 4> ClobberRegs;
4537 SmallVector<AsmRewrite, 4> AsmStrRewrites;
4542 // While we have input, parse each statement.
4543 unsigned InputIdx = 0;
4544 unsigned OutputIdx = 0;
4545 while (getLexer().isNot(AsmToken::Eof)) {
4546 ParseStatementInfo Info(&AsmStrRewrites);
4547 if (parseStatement(Info, &SI))
4550 if (Info.ParseError)
4553 if (Info.Opcode == ~0U)
4556 const MCInstrDesc &Desc = MII->get(Info.Opcode);
4558 // Build the list of clobbers, outputs and inputs.
4559 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
4560 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i];
4563 if (Operand.isImm())
4566 // Register operand.
4567 if (Operand.isReg() && !Operand.needAddressOf() &&
4568 !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) {
4569 unsigned NumDefs = Desc.getNumDefs();
4571 if (NumDefs && Operand.getMCOperandNum() < NumDefs)
4572 ClobberRegs.push_back(Operand.getReg());
4576 // Expr/Input or Output.
4577 StringRef SymName = Operand.getSymName();
4578 if (SymName.empty())
4581 void *OpDecl = Operand.getOpDecl();
4585 bool isOutput = (i == 1) && Desc.mayStore();
4586 SMLoc Start = SMLoc::getFromPointer(SymName.data());
4589 OutputDecls.push_back(OpDecl);
4590 OutputDeclsAddressOf.push_back(Operand.needAddressOf());
4591 OutputConstraints.push_back('=' + Operand.getConstraint().str());
4592 AsmStrRewrites.push_back(AsmRewrite(AOK_Output, Start, SymName.size()));
4594 InputDecls.push_back(OpDecl);
4595 InputDeclsAddressOf.push_back(Operand.needAddressOf());
4596 InputConstraints.push_back(Operand.getConstraint().str());
4597 AsmStrRewrites.push_back(AsmRewrite(AOK_Input, Start, SymName.size()));
4601 // Consider implicit defs to be clobbers. Think of cpuid and push.
4602 ArrayRef<uint16_t> ImpDefs(Desc.getImplicitDefs(),
4603 Desc.getNumImplicitDefs());
4604 ClobberRegs.insert(ClobberRegs.end(), ImpDefs.begin(), ImpDefs.end());
4607 // Set the number of Outputs and Inputs.
4608 NumOutputs = OutputDecls.size();
4609 NumInputs = InputDecls.size();
4611 // Set the unique clobbers.
4612 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
4613 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
4615 Clobbers.assign(ClobberRegs.size(), std::string());
4616 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
4617 raw_string_ostream OS(Clobbers[I]);
4618 IP->printRegName(OS, ClobberRegs[I]);
4621 // Merge the various outputs and inputs. Output are expected first.
4622 if (NumOutputs || NumInputs) {
4623 unsigned NumExprs = NumOutputs + NumInputs;
4624 OpDecls.resize(NumExprs);
4625 Constraints.resize(NumExprs);
4626 for (unsigned i = 0; i < NumOutputs; ++i) {
4627 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
4628 Constraints[i] = OutputConstraints[i];
4630 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
4631 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
4632 Constraints[j] = InputConstraints[i];
4636 // Build the IR assembly string.
4637 std::string AsmStringIR;
4638 raw_string_ostream OS(AsmStringIR);
4639 StringRef ASMString =
4640 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer();
4641 const char *AsmStart = ASMString.begin();
4642 const char *AsmEnd = ASMString.end();
4643 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
4644 for (const AsmRewrite &AR : AsmStrRewrites) {
4645 AsmRewriteKind Kind = AR.Kind;
4646 if (Kind == AOK_Delete)
4649 const char *Loc = AR.Loc.getPointer();
4650 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!");
4652 // Emit everything up to the immediate/expression.
4653 if (unsigned Len = Loc - AsmStart)
4654 OS << StringRef(AsmStart, Len);
4656 // Skip the original expression.
4657 if (Kind == AOK_Skip) {
4658 AsmStart = Loc + AR.Len;
4662 unsigned AdditionalSkip = 0;
4663 // Rewrite expressions in $N notation.
4668 OS << "$$" << AR.Val;
4674 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label;
4677 OS << '$' << InputIdx++;
4680 OS << '$' << OutputIdx++;
4682 case AOK_SizeDirective:
4685 case 8: OS << "byte ptr "; break;
4686 case 16: OS << "word ptr "; break;
4687 case 32: OS << "dword ptr "; break;
4688 case 64: OS << "qword ptr "; break;
4689 case 80: OS << "xword ptr "; break;
4690 case 128: OS << "xmmword ptr "; break;
4691 case 256: OS << "ymmword ptr "; break;
4698 unsigned Val = AR.Val;
4699 OS << ".align " << Val;
4701 // Skip the original immediate.
4702 assert(Val < 10 && "Expected alignment less then 2^10.");
4703 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
4706 case AOK_DotOperator:
4707 // Insert the dot if the user omitted it.
4709 if (AsmStringIR.back() != '.')
4715 // Skip the original expression.
4716 AsmStart = Loc + AR.Len + AdditionalSkip;
4719 // Emit the remainder of the asm string.
4720 if (AsmStart != AsmEnd)
4721 OS << StringRef(AsmStart, AsmEnd - AsmStart);
4723 AsmString = OS.str();
4727 /// \brief Create an MCAsmParser instance.
4728 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
4729 MCStreamer &Out, const MCAsmInfo &MAI) {
4730 return new AsmParser(SM, C, Out, MAI);