Bug Summary

File:lib/MC/MCParser/AsmParser.cpp
Warning:line 3397, column 7
Value stored to 'FileNumber' is never read

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name AsmParser.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-8/lib/clang/8.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/lib/MC/MCParser -I /build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/include -I /build/llvm-toolchain-snapshot-8~svn345461/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/8.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-8/lib/clang/8.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/lib/MC/MCParser -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-10-27-211344-32123-1 -x c++ /build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp -faddrsig
1//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This class implements the parser for assembly files.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/ADT/APFloat.h"
15#include "llvm/ADT/APInt.h"
16#include "llvm/ADT/ArrayRef.h"
17#include "llvm/ADT/None.h"
18#include "llvm/ADT/STLExtras.h"
19#include "llvm/ADT/SmallString.h"
20#include "llvm/ADT/SmallVector.h"
21#include "llvm/ADT/StringExtras.h"
22#include "llvm/ADT/StringMap.h"
23#include "llvm/ADT/StringRef.h"
24#include "llvm/ADT/Twine.h"
25#include "llvm/BinaryFormat/Dwarf.h"
26#include "llvm/MC/MCAsmInfo.h"
27#include "llvm/MC/MCCodeView.h"
28#include "llvm/MC/MCContext.h"
29#include "llvm/MC/MCDirectives.h"
30#include "llvm/MC/MCDwarf.h"
31#include "llvm/MC/MCExpr.h"
32#include "llvm/MC/MCInstPrinter.h"
33#include "llvm/MC/MCInstrDesc.h"
34#include "llvm/MC/MCInstrInfo.h"
35#include "llvm/MC/MCObjectFileInfo.h"
36#include "llvm/MC/MCParser/AsmCond.h"
37#include "llvm/MC/MCParser/AsmLexer.h"
38#include "llvm/MC/MCParser/MCAsmLexer.h"
39#include "llvm/MC/MCParser/MCAsmParser.h"
40#include "llvm/MC/MCParser/MCAsmParserExtension.h"
41#include "llvm/MC/MCParser/MCAsmParserUtils.h"
42#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
43#include "llvm/MC/MCParser/MCTargetAsmParser.h"
44#include "llvm/MC/MCRegisterInfo.h"
45#include "llvm/MC/MCSection.h"
46#include "llvm/MC/MCStreamer.h"
47#include "llvm/MC/MCSymbol.h"
48#include "llvm/MC/MCTargetOptions.h"
49#include "llvm/MC/MCValue.h"
50#include "llvm/Support/Casting.h"
51#include "llvm/Support/CommandLine.h"
52#include "llvm/Support/ErrorHandling.h"
53#include "llvm/Support/MD5.h"
54#include "llvm/Support/MathExtras.h"
55#include "llvm/Support/MemoryBuffer.h"
56#include "llvm/Support/SMLoc.h"
57#include "llvm/Support/SourceMgr.h"
58#include "llvm/Support/raw_ostream.h"
59#include <algorithm>
60#include <cassert>
61#include <cctype>
62#include <climits>
63#include <cstddef>
64#include <cstdint>
65#include <deque>
66#include <memory>
67#include <sstream>
68#include <string>
69#include <tuple>
70#include <utility>
71#include <vector>
72
73using namespace llvm;
74
75MCAsmParserSemaCallback::~MCAsmParserSemaCallback() = default;
76
77static cl::opt<unsigned> AsmMacroMaxNestingDepth(
78 "asm-macro-max-nesting-depth", cl::init(20), cl::Hidden,
79 cl::desc("The maximum nesting depth allowed for assembly macros."));
80
81namespace {
82
83/// Helper types for tracking macro definitions.
84typedef std::vector<AsmToken> MCAsmMacroArgument;
85typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
86
87/// Helper class for storing information about an active macro
88/// instantiation.
89struct MacroInstantiation {
90 /// The location of the instantiation.
91 SMLoc InstantiationLoc;
92
93 /// The buffer where parsing should resume upon instantiation completion.
94 int ExitBuffer;
95
96 /// The location where parsing should resume upon instantiation completion.
97 SMLoc ExitLoc;
98
99 /// The depth of TheCondStack at the start of the instantiation.
100 size_t CondStackDepth;
101
102public:
103 MacroInstantiation(SMLoc IL, int EB, SMLoc EL, size_t CondStackDepth);
104};
105
106struct ParseStatementInfo {
107 /// The parsed operands from the last parsed statement.
108 SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands;
109
110 /// The opcode from the last parsed instruction.
111 unsigned Opcode = ~0U;
112
113 /// Was there an error parsing the inline assembly?
114 bool ParseError = false;
115
116 SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr;
117
118 ParseStatementInfo() = delete;
119 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
120 : AsmRewrites(rewrites) {}
121};
122
123/// The concrete assembly parser instance.
124class AsmParser : public MCAsmParser {
125private:
126 AsmLexer Lexer;
127 MCContext &Ctx;
128 MCStreamer &Out;
129 const MCAsmInfo &MAI;
130 SourceMgr &SrcMgr;
131 SourceMgr::DiagHandlerTy SavedDiagHandler;
132 void *SavedDiagContext;
133 std::unique_ptr<MCAsmParserExtension> PlatformParser;
134
135 /// This is the current buffer index we're lexing from as managed by the
136 /// SourceMgr object.
137 unsigned CurBuffer;
138
139 AsmCond TheCondState;
140 std::vector<AsmCond> TheCondStack;
141
142 /// maps directive names to handler methods in parser
143 /// extensions. Extensions register themselves in this map by calling
144 /// addDirectiveHandler.
145 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
146
147 /// Stack of active macro instantiations.
148 std::vector<MacroInstantiation*> ActiveMacros;
149
150 /// List of bodies of anonymous macros.
151 std::deque<MCAsmMacro> MacroLikeBodies;
152
153 /// Boolean tracking whether macro substitution is enabled.
154 unsigned MacrosEnabledFlag : 1;
155
156 /// Keeps track of how many .macro's have been instantiated.
157 unsigned NumOfMacroInstantiations;
158
159 /// The values from the last parsed cpp hash file line comment if any.
160 struct CppHashInfoTy {
161 StringRef Filename;
162 int64_t LineNumber = 0;
163 SMLoc Loc;
164 unsigned Buf = 0;
165 };
166 CppHashInfoTy CppHashInfo;
167
168 /// List of forward directional labels for diagnosis at the end.
169 SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels;
170
171 /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
172 unsigned AssemblerDialect = ~0U;
173
174 /// is Darwin compatibility enabled?
175 bool IsDarwin = false;
176
177 /// Are we parsing ms-style inline assembly?
178 bool ParsingInlineAsm = false;
179
180 /// Did we already inform the user about inconsistent MD5 usage?
181 bool ReportedInconsistentMD5 = false;
182
183 // Is alt macro mode enabled.
184 bool AltMacroMode = false;
185
186public:
187 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
188 const MCAsmInfo &MAI, unsigned CB);
189 AsmParser(const AsmParser &) = delete;
190 AsmParser &operator=(const AsmParser &) = delete;
191 ~AsmParser() override;
192
193 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;
194
195 void addDirectiveHandler(StringRef Directive,
196 ExtensionDirectiveHandler Handler) override {
197 ExtensionDirectiveMap[Directive] = Handler;
198 }
199
200 void addAliasForDirective(StringRef Directive, StringRef Alias) override {
201 DirectiveKindMap[Directive] = DirectiveKindMap[Alias];
202 }
203
204 /// @name MCAsmParser Interface
205 /// {
206
207 SourceMgr &getSourceManager() override { return SrcMgr; }
208 MCAsmLexer &getLexer() override { return Lexer; }
209 MCContext &getContext() override { return Ctx; }
210 MCStreamer &getStreamer() override { return Out; }
211
212 CodeViewContext &getCVContext() { return Ctx.getCVContext(); }
213
214 unsigned getAssemblerDialect() override {
215 if (AssemblerDialect == ~0U)
216 return MAI.getAssemblerDialect();
217 else
218 return AssemblerDialect;
219 }
220 void setAssemblerDialect(unsigned i) override {
221 AssemblerDialect = i;
222 }
223
224 void Note(SMLoc L, const Twine &Msg, SMRange Range = None) override;
225 bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) override;
226 bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) override;
227
228 const AsmToken &Lex() override;
229
230 void setParsingInlineAsm(bool V) override {
231 ParsingInlineAsm = V;
232 // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and
233 // hex integer literals.
234 Lexer.setLexMasmIntegers(V);
235 }
236 bool isParsingInlineAsm() override { return ParsingInlineAsm; }
237
238 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
239 unsigned &NumOutputs, unsigned &NumInputs,
240 SmallVectorImpl<std::pair<void *,bool>> &OpDecls,
241 SmallVectorImpl<std::string> &Constraints,
242 SmallVectorImpl<std::string> &Clobbers,
243 const MCInstrInfo *MII, const MCInstPrinter *IP,
244 MCAsmParserSemaCallback &SI) override;
245
246 bool parseExpression(const MCExpr *&Res);
247 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
248 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) override;
249 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
250 bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
251 SMLoc &EndLoc) override;
252 bool parseAbsoluteExpression(int64_t &Res) override;
253
254 /// Parse a floating point expression using the float \p Semantics
255 /// and set \p Res to the value.
256 bool parseRealValue(const fltSemantics &Semantics, APInt &Res);
257
258 /// Parse an identifier or string (as a quoted identifier)
259 /// and set \p Res to the identifier contents.
260 bool parseIdentifier(StringRef &Res) override;
261 void eatToEndOfStatement() override;
262
263 bool checkForValidSection() override;
264
265 /// }
266
267private:
268 bool parseStatement(ParseStatementInfo &Info,
269 MCAsmParserSemaCallback *SI);
270 bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites);
271 bool parseCppHashLineFilenameComment(SMLoc L);
272
273 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
274 ArrayRef<MCAsmMacroParameter> Parameters);
275 bool expandMacro(raw_svector_ostream &OS, StringRef Body,
276 ArrayRef<MCAsmMacroParameter> Parameters,
277 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable,
278 SMLoc L);
279
280 /// Are macros enabled in the parser?
281 bool areMacrosEnabled() {return MacrosEnabledFlag;}
282
283 /// Control a flag in the parser that enables or disables macros.
284 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}
285
286 /// Are we inside a macro instantiation?
287 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();}
288
289 /// Handle entry to macro instantiation.
290 ///
291 /// \param M The macro.
292 /// \param NameLoc Instantiation location.
293 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
294
295 /// Handle exit from macro instantiation.
296 void handleMacroExit();
297
298 /// Extract AsmTokens for a macro argument.
299 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg);
300
301 /// Parse all macro arguments for a given macro.
302 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
303
304 void printMacroInstantiations();
305 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
306 SMRange Range = None) const {
307 ArrayRef<SMRange> Ranges(Range);
308 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
309 }
310 static void DiagHandler(const SMDiagnostic &Diag, void *Context);
311
312 /// Should we emit DWARF describing this assembler source? (Returns false if
313 /// the source has .file directives, which means we don't want to generate
314 /// info describing the assembler source itself.)
315 bool enabledGenDwarfForAssembly();
316
317 /// Enter the specified file. This returns true on failure.
318 bool enterIncludeFile(const std::string &Filename);
319
320 /// Process the specified file for the .incbin directive.
321 /// This returns true on failure.
322 bool processIncbinFile(const std::string &Filename, int64_t Skip = 0,
323 const MCExpr *Count = nullptr, SMLoc Loc = SMLoc());
324
325 /// Reset the current lexer position to that given by \p Loc. The
326 /// current token is not set; clients should ensure Lex() is called
327 /// subsequently.
328 ///
329 /// \param InBuffer If not 0, should be the known buffer id that contains the
330 /// location.
331 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0);
332
333 /// Parse up to the end of statement and a return the contents from the
334 /// current token until the end of the statement; the current token on exit
335 /// will be either the EndOfStatement or EOF.
336 StringRef parseStringToEndOfStatement() override;
337
338 /// Parse until the end of a statement or a comma is encountered,
339 /// return the contents from the current token up to the end or comma.
340 StringRef parseStringToComma();
341
342 bool parseAssignment(StringRef Name, bool allow_redef,
343 bool NoDeadStrip = false);
344
345 unsigned getBinOpPrecedence(AsmToken::TokenKind K,
346 MCBinaryExpr::Opcode &Kind);
347
348 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
349 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
350 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);
351
352 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);
353
354 bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName);
355 bool parseCVFileId(int64_t &FileId, StringRef DirectiveName);
356
357 // Generic (target and platform independent) directive parsing.
358 enum DirectiveKind {
359 DK_NO_DIRECTIVE, // Placeholder
360 DK_SET,
361 DK_EQU,
362 DK_EQUIV,
363 DK_ASCII,
364 DK_ASCIZ,
365 DK_STRING,
366 DK_BYTE,
367 DK_SHORT,
368 DK_RELOC,
369 DK_VALUE,
370 DK_2BYTE,
371 DK_LONG,
372 DK_INT,
373 DK_4BYTE,
374 DK_QUAD,
375 DK_8BYTE,
376 DK_OCTA,
377 DK_DC,
378 DK_DC_A,
379 DK_DC_B,
380 DK_DC_D,
381 DK_DC_L,
382 DK_DC_S,
383 DK_DC_W,
384 DK_DC_X,
385 DK_DCB,
386 DK_DCB_B,
387 DK_DCB_D,
388 DK_DCB_L,
389 DK_DCB_S,
390 DK_DCB_W,
391 DK_DCB_X,
392 DK_DS,
393 DK_DS_B,
394 DK_DS_D,
395 DK_DS_L,
396 DK_DS_P,
397 DK_DS_S,
398 DK_DS_W,
399 DK_DS_X,
400 DK_SINGLE,
401 DK_FLOAT,
402 DK_DOUBLE,
403 DK_ALIGN,
404 DK_ALIGN32,
405 DK_BALIGN,
406 DK_BALIGNW,
407 DK_BALIGNL,
408 DK_P2ALIGN,
409 DK_P2ALIGNW,
410 DK_P2ALIGNL,
411 DK_ORG,
412 DK_FILL,
413 DK_ENDR,
414 DK_BUNDLE_ALIGN_MODE,
415 DK_BUNDLE_LOCK,
416 DK_BUNDLE_UNLOCK,
417 DK_ZERO,
418 DK_EXTERN,
419 DK_GLOBL,
420 DK_GLOBAL,
421 DK_LAZY_REFERENCE,
422 DK_NO_DEAD_STRIP,
423 DK_SYMBOL_RESOLVER,
424 DK_PRIVATE_EXTERN,
425 DK_REFERENCE,
426 DK_WEAK_DEFINITION,
427 DK_WEAK_REFERENCE,
428 DK_WEAK_DEF_CAN_BE_HIDDEN,
429 DK_COMM,
430 DK_COMMON,
431 DK_LCOMM,
432 DK_ABORT,
433 DK_INCLUDE,
434 DK_INCBIN,
435 DK_CODE16,
436 DK_CODE16GCC,
437 DK_REPT,
438 DK_IRP,
439 DK_IRPC,
440 DK_IF,
441 DK_IFEQ,
442 DK_IFGE,
443 DK_IFGT,
444 DK_IFLE,
445 DK_IFLT,
446 DK_IFNE,
447 DK_IFB,
448 DK_IFNB,
449 DK_IFC,
450 DK_IFEQS,
451 DK_IFNC,
452 DK_IFNES,
453 DK_IFDEF,
454 DK_IFNDEF,
455 DK_IFNOTDEF,
456 DK_ELSEIF,
457 DK_ELSE,
458 DK_ENDIF,
459 DK_SPACE,
460 DK_SKIP,
461 DK_FILE,
462 DK_LINE,
463 DK_LOC,
464 DK_STABS,
465 DK_CV_FILE,
466 DK_CV_FUNC_ID,
467 DK_CV_INLINE_SITE_ID,
468 DK_CV_LOC,
469 DK_CV_LINETABLE,
470 DK_CV_INLINE_LINETABLE,
471 DK_CV_DEF_RANGE,
472 DK_CV_STRINGTABLE,
473 DK_CV_STRING,
474 DK_CV_FILECHECKSUMS,
475 DK_CV_FILECHECKSUM_OFFSET,
476 DK_CV_FPO_DATA,
477 DK_CFI_SECTIONS,
478 DK_CFI_STARTPROC,
479 DK_CFI_ENDPROC,
480 DK_CFI_DEF_CFA,
481 DK_CFI_DEF_CFA_OFFSET,
482 DK_CFI_ADJUST_CFA_OFFSET,
483 DK_CFI_DEF_CFA_REGISTER,
484 DK_CFI_OFFSET,
485 DK_CFI_REL_OFFSET,
486 DK_CFI_PERSONALITY,
487 DK_CFI_LSDA,
488 DK_CFI_REMEMBER_STATE,
489 DK_CFI_RESTORE_STATE,
490 DK_CFI_SAME_VALUE,
491 DK_CFI_RESTORE,
492 DK_CFI_ESCAPE,
493 DK_CFI_RETURN_COLUMN,
494 DK_CFI_SIGNAL_FRAME,
495 DK_CFI_UNDEFINED,
496 DK_CFI_REGISTER,
497 DK_CFI_WINDOW_SAVE,
498 DK_MACROS_ON,
499 DK_MACROS_OFF,
500 DK_ALTMACRO,
501 DK_NOALTMACRO,
502 DK_MACRO,
503 DK_EXITM,
504 DK_ENDM,
505 DK_ENDMACRO,
506 DK_PURGEM,
507 DK_SLEB128,
508 DK_ULEB128,
509 DK_ERR,
510 DK_ERROR,
511 DK_WARNING,
512 DK_PRINT,
513 DK_ADDRSIG,
514 DK_ADDRSIG_SYM,
515 DK_END
516 };
517
518 /// Maps directive name --> DirectiveKind enum, for
519 /// directives parsed by this class.
520 StringMap<DirectiveKind> DirectiveKindMap;
521
522 // ".ascii", ".asciz", ".string"
523 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
524 bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc"
525 bool parseDirectiveValue(StringRef IDVal,
526 unsigned Size); // ".byte", ".long", ...
527 bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ...
528 bool parseDirectiveRealValue(StringRef IDVal,
529 const fltSemantics &); // ".single", ...
530 bool parseDirectiveFill(); // ".fill"
531 bool parseDirectiveZero(); // ".zero"
532 // ".set", ".equ", ".equiv"
533 bool parseDirectiveSet(StringRef IDVal, bool allow_redef);
534 bool parseDirectiveOrg(); // ".org"
535 // ".align{,32}", ".p2align{,w,l}"
536 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize);
537
538 // ".file", ".line", ".loc", ".stabs"
539 bool parseDirectiveFile(SMLoc DirectiveLoc);
540 bool parseDirectiveLine();
541 bool parseDirectiveLoc();
542 bool parseDirectiveStabs();
543
544 // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable",
545 // ".cv_inline_linetable", ".cv_def_range", ".cv_string"
546 bool parseDirectiveCVFile();
547 bool parseDirectiveCVFuncId();
548 bool parseDirectiveCVInlineSiteId();
549 bool parseDirectiveCVLoc();
550 bool parseDirectiveCVLinetable();
551 bool parseDirectiveCVInlineLinetable();
552 bool parseDirectiveCVDefRange();
553 bool parseDirectiveCVString();
554 bool parseDirectiveCVStringTable();
555 bool parseDirectiveCVFileChecksums();
556 bool parseDirectiveCVFileChecksumOffset();
557 bool parseDirectiveCVFPOData();
558
559 // .cfi directives
560 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc);
561 bool parseDirectiveCFIWindowSave();
562 bool parseDirectiveCFISections();
563 bool parseDirectiveCFIStartProc();
564 bool parseDirectiveCFIEndProc();
565 bool parseDirectiveCFIDefCfaOffset();
566 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
567 bool parseDirectiveCFIAdjustCfaOffset();
568 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
569 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
570 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
571 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
572 bool parseDirectiveCFIRememberState();
573 bool parseDirectiveCFIRestoreState();
574 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
575 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
576 bool parseDirectiveCFIEscape();
577 bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc);
578 bool parseDirectiveCFISignalFrame();
579 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
580
581 // macro directives
582 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
583 bool parseDirectiveExitMacro(StringRef Directive);
584 bool parseDirectiveEndMacro(StringRef Directive);
585 bool parseDirectiveMacro(SMLoc DirectiveLoc);
586 bool parseDirectiveMacrosOnOff(StringRef Directive);
587 // alternate macro mode directives
588 bool parseDirectiveAltmacro(StringRef Directive);
589 // ".bundle_align_mode"
590 bool parseDirectiveBundleAlignMode();
591 // ".bundle_lock"
592 bool parseDirectiveBundleLock();
593 // ".bundle_unlock"
594 bool parseDirectiveBundleUnlock();
595
596 // ".space", ".skip"
597 bool parseDirectiveSpace(StringRef IDVal);
598
599 // ".dcb"
600 bool parseDirectiveDCB(StringRef IDVal, unsigned Size);
601 bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &);
602 // ".ds"
603 bool parseDirectiveDS(StringRef IDVal, unsigned Size);
604
605 // .sleb128 (Signed=true) and .uleb128 (Signed=false)
606 bool parseDirectiveLEB128(bool Signed);
607
608 /// Parse a directive like ".globl" which
609 /// accepts a single symbol (which should be a label or an external).
610 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);
611
612 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
613
614 bool parseDirectiveAbort(); // ".abort"
615 bool parseDirectiveInclude(); // ".include"
616 bool parseDirectiveIncbin(); // ".incbin"
617
618 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne"
619 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
620 // ".ifb" or ".ifnb", depending on ExpectBlank.
621 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
622 // ".ifc" or ".ifnc", depending on ExpectEqual.
623 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
624 // ".ifeqs" or ".ifnes", depending on ExpectEqual.
625 bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual);
626 // ".ifdef" or ".ifndef", depending on expect_defined
627 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
628 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
629 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
630 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
631 bool parseEscapedString(std::string &Data) override;
632
633 const MCExpr *applyModifierToExpr(const MCExpr *E,
634 MCSymbolRefExpr::VariantKind Variant);
635
636 // Macro-like directives
637 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
638 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
639 raw_svector_ostream &OS);
640 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive);
641 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
642 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
643 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
644
645 // "_emit" or "__emit"
646 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
647 size_t Len);
648
649 // "align"
650 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
651
652 // "end"
653 bool parseDirectiveEnd(SMLoc DirectiveLoc);
654
655 // ".err" or ".error"
656 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage);
657
658 // ".warning"
659 bool parseDirectiveWarning(SMLoc DirectiveLoc);
660
661 // .print <double-quotes-string>
662 bool parseDirectivePrint(SMLoc DirectiveLoc);
663
664 // Directives to support address-significance tables.
665 bool parseDirectiveAddrsig();
666 bool parseDirectiveAddrsigSym();
667
668 void initializeDirectiveKindMap();
669};
670
671} // end anonymous namespace
672
673namespace llvm {
674
675extern MCAsmParserExtension *createDarwinAsmParser();
676extern MCAsmParserExtension *createELFAsmParser();
677extern MCAsmParserExtension *createCOFFAsmParser();
678
679} // end namespace llvm
680
681enum { DEFAULT_ADDRSPACE = 0 };
682
683AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
684 const MCAsmInfo &MAI, unsigned CB = 0)
685 : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM),
686 CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) {
687 HadError = false;
688 // Save the old handler.
689 SavedDiagHandler = SrcMgr.getDiagHandler();
690 SavedDiagContext = SrcMgr.getDiagContext();
691 // Set our own handler which calls the saved handler.
692 SrcMgr.setDiagHandler(DiagHandler, this);
693 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
694
695 // Initialize the platform / file format parser.
696 switch (Ctx.getObjectFileInfo()->getObjectFileType()) {
697 case MCObjectFileInfo::IsCOFF:
698 PlatformParser.reset(createCOFFAsmParser());
699 break;
700 case MCObjectFileInfo::IsMachO:
701 PlatformParser.reset(createDarwinAsmParser());
702 IsDarwin = true;
703 break;
704 case MCObjectFileInfo::IsELF:
705 PlatformParser.reset(createELFAsmParser());
706 break;
707 case MCObjectFileInfo::IsWasm:
708 // TODO: WASM will need its own MCAsmParserExtension implementation, but
709 // for now we can re-use the ELF one, since the directives can be the
710 // same for now.
711 PlatformParser.reset(createELFAsmParser());
712 break;
713 }
714
715 PlatformParser->Initialize(*this);
716 initializeDirectiveKindMap();
717
718 NumOfMacroInstantiations = 0;
719}
720
721AsmParser::~AsmParser() {
722 assert((HadError || ActiveMacros.empty()) &&(((HadError || ActiveMacros.empty()) && "Unexpected active macro instantiation!"
) ? static_cast<void> (0) : __assert_fail ("(HadError || ActiveMacros.empty()) && \"Unexpected active macro instantiation!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 723, __PRETTY_FUNCTION__))
723 "Unexpected active macro instantiation!")(((HadError || ActiveMacros.empty()) && "Unexpected active macro instantiation!"
) ? static_cast<void> (0) : __assert_fail ("(HadError || ActiveMacros.empty()) && \"Unexpected active macro instantiation!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 723, __PRETTY_FUNCTION__))
;
724
725 // Restore the saved diagnostics handler and context for use during
726 // finalization.
727 SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext);
728}
729
730void AsmParser::printMacroInstantiations() {
731 // Print the active macro instantiation stack.
732 for (std::vector<MacroInstantiation *>::const_reverse_iterator
733 it = ActiveMacros.rbegin(),
734 ie = ActiveMacros.rend();
735 it != ie; ++it)
736 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
737 "while in macro instantiation");
738}
739
740void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) {
741 printPendingErrors();
742 printMessage(L, SourceMgr::DK_Note, Msg, Range);
743 printMacroInstantiations();
744}
745
746bool AsmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) {
747 if(getTargetParser().getTargetOptions().MCNoWarn)
748 return false;
749 if (getTargetParser().getTargetOptions().MCFatalWarnings)
750 return Error(L, Msg, Range);
751 printMessage(L, SourceMgr::DK_Warning, Msg, Range);
752 printMacroInstantiations();
753 return false;
754}
755
756bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) {
757 HadError = true;
758 printMessage(L, SourceMgr::DK_Error, Msg, Range);
759 printMacroInstantiations();
760 return true;
761}
762
763bool AsmParser::enterIncludeFile(const std::string &Filename) {
764 std::string IncludedFile;
765 unsigned NewBuf =
766 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
767 if (!NewBuf)
768 return true;
769
770 CurBuffer = NewBuf;
771 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
772 return false;
773}
774
775/// Process the specified .incbin file by searching for it in the include paths
776/// then just emitting the byte contents of the file to the streamer. This
777/// returns true on failure.
778bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip,
779 const MCExpr *Count, SMLoc Loc) {
780 std::string IncludedFile;
781 unsigned NewBuf =
782 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
783 if (!NewBuf)
784 return true;
785
786 // Pick up the bytes from the file and emit them.
787 StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer();
788 Bytes = Bytes.drop_front(Skip);
789 if (Count) {
790 int64_t Res;
791 if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
792 return Error(Loc, "expected absolute expression");
793 if (Res < 0)
794 return Warning(Loc, "negative count has no effect");
795 Bytes = Bytes.take_front(Res);
796 }
797 getStreamer().EmitBytes(Bytes);
798 return false;
799}
800
801void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) {
802 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
803 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
804 Loc.getPointer());
805}
806
807const AsmToken &AsmParser::Lex() {
808 if (Lexer.getTok().is(AsmToken::Error))
809 Error(Lexer.getErrLoc(), Lexer.getErr());
810
811 // if it's a end of statement with a comment in it
812 if (getTok().is(AsmToken::EndOfStatement)) {
813 // if this is a line comment output it.
814 if (!getTok().getString().empty() && getTok().getString().front() != '\n' &&
815 getTok().getString().front() != '\r' && MAI.preserveAsmComments())
816 Out.addExplicitComment(Twine(getTok().getString()));
817 }
818
819 const AsmToken *tok = &Lexer.Lex();
820
821 // Parse comments here to be deferred until end of next statement.
822 while (tok->is(AsmToken::Comment)) {
823 if (MAI.preserveAsmComments())
824 Out.addExplicitComment(Twine(tok->getString()));
825 tok = &Lexer.Lex();
826 }
827
828 if (tok->is(AsmToken::Eof)) {
829 // If this is the end of an included file, pop the parent file off the
830 // include stack.
831 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
832 if (ParentIncludeLoc != SMLoc()) {
833 jumpToLoc(ParentIncludeLoc);
834 return Lex();
835 }
836 }
837
838 return *tok;
839}
840
841bool AsmParser::enabledGenDwarfForAssembly() {
842 // Check whether the user specified -g.
843 if (!getContext().getGenDwarfForAssembly())
844 return false;
845 // If we haven't encountered any .file directives (which would imply that
846 // the assembler source was produced with debug info already) then emit one
847 // describing the assembler source file itself.
848 if (getContext().getGenDwarfFileNumber() == 0)
849 getContext().setGenDwarfFileNumber(getStreamer().EmitDwarfFileDirective(
850 0, StringRef(), getContext().getMainFileName()));
851 return true;
852}
853
854bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
855 // Create the initial section, if requested.
856 if (!NoInitialTextSection)
857 Out.InitSections(false);
858
859 // Prime the lexer.
860 Lex();
861
862 HadError = false;
863 AsmCond StartingCondState = TheCondState;
864 SmallVector<AsmRewrite, 4> AsmStrRewrites;
865
866 // If we are generating dwarf for assembly source files save the initial text
867 // section. (Don't use enabledGenDwarfForAssembly() here, as we aren't
868 // emitting any actual debug info yet and haven't had a chance to parse any
869 // embedded .file directives.)
870 if (getContext().getGenDwarfForAssembly()) {
871 MCSection *Sec = getStreamer().getCurrentSectionOnly();
872 if (!Sec->getBeginSymbol()) {
873 MCSymbol *SectionStartSym = getContext().createTempSymbol();
874 getStreamer().EmitLabel(SectionStartSym);
875 Sec->setBeginSymbol(SectionStartSym);
876 }
877 bool InsertResult = getContext().addGenDwarfSection(Sec);
878 assert(InsertResult && ".text section should not have debug info yet")((InsertResult && ".text section should not have debug info yet"
) ? static_cast<void> (0) : __assert_fail ("InsertResult && \".text section should not have debug info yet\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 878, __PRETTY_FUNCTION__))
;
879 (void)InsertResult;
880 }
881
882 // While we have input, parse each statement.
883 while (Lexer.isNot(AsmToken::Eof)) {
884 ParseStatementInfo Info(&AsmStrRewrites);
885 if (!parseStatement(Info, nullptr))
886 continue;
887
888 // If we have a Lexer Error we are on an Error Token. Load in Lexer Error
889 // for printing ErrMsg via Lex() only if no (presumably better) parser error
890 // exists.
891 if (!hasPendingError() && Lexer.getTok().is(AsmToken::Error)) {
892 Lex();
893 }
894
895 // parseStatement returned true so may need to emit an error.
896 printPendingErrors();
897
898 // Skipping to the next line if needed.
899 if (!getLexer().isAtStartOfStatement())
900 eatToEndOfStatement();
901 }
902
903 // All errors should have been emitted.
904 assert(!hasPendingError() && "unexpected error from parseStatement")((!hasPendingError() && "unexpected error from parseStatement"
) ? static_cast<void> (0) : __assert_fail ("!hasPendingError() && \"unexpected error from parseStatement\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 904, __PRETTY_FUNCTION__))
;
905
906 getTargetParser().flushPendingInstructions(getStreamer());
907
908 if (TheCondState.TheCond != StartingCondState.TheCond ||
909 TheCondState.Ignore != StartingCondState.Ignore)
910 printError(getTok().getLoc(), "unmatched .ifs or .elses");
911 // Check to see there are no empty DwarfFile slots.
912 const auto &LineTables = getContext().getMCDwarfLineTables();
913 if (!LineTables.empty()) {
914 unsigned Index = 0;
915 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) {
916 if (File.Name.empty() && Index != 0)
917 printError(getTok().getLoc(), "unassigned file number: " +
918 Twine(Index) +
919 " for .file directives");
920 ++Index;
921 }
922 }
923
924 // Check to see that all assembler local symbols were actually defined.
925 // Targets that don't do subsections via symbols may not want this, though,
926 // so conservatively exclude them. Only do this if we're finalizing, though,
927 // as otherwise we won't necessarilly have seen everything yet.
928 if (!NoFinalize) {
929 if (MAI.hasSubsectionsViaSymbols()) {
930 for (const auto &TableEntry : getContext().getSymbols()) {
931 MCSymbol *Sym = TableEntry.getValue();
932 // Variable symbols may not be marked as defined, so check those
933 // explicitly. If we know it's a variable, we have a definition for
934 // the purposes of this check.
935 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
936 // FIXME: We would really like to refer back to where the symbol was
937 // first referenced for a source location. We need to add something
938 // to track that. Currently, we just point to the end of the file.
939 printError(getTok().getLoc(), "assembler local symbol '" +
940 Sym->getName() + "' not defined");
941 }
942 }
943
944 // Temporary symbols like the ones for directional jumps don't go in the
945 // symbol table. They also need to be diagnosed in all (final) cases.
946 for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) {
947 if (std::get<2>(LocSym)->isUndefined()) {
948 // Reset the state of any "# line file" directives we've seen to the
949 // context as it was at the diagnostic site.
950 CppHashInfo = std::get<1>(LocSym);
951 printError(std::get<0>(LocSym), "directional label undefined");
952 }
953 }
954 }
955
956 // Finalize the output stream if there are no errors and if the client wants
957 // us to.
958 if (!HadError && !NoFinalize)
959 Out.Finish();
960
961 return HadError || getContext().hadError();
962}
963
964bool AsmParser::checkForValidSection() {
965 if (!ParsingInlineAsm && !getStreamer().getCurrentSectionOnly()) {
966 Out.InitSections(false);
967 return Error(getTok().getLoc(),
968 "expected section directive before assembly directive");
969 }
970 return false;
971}
972
973/// Throw away the rest of the line for testing purposes.
974void AsmParser::eatToEndOfStatement() {
975 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
976 Lexer.Lex();
977
978 // Eat EOL.
979 if (Lexer.is(AsmToken::EndOfStatement))
980 Lexer.Lex();
981}
982
983StringRef AsmParser::parseStringToEndOfStatement() {
984 const char *Start = getTok().getLoc().getPointer();
985
986 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
987 Lexer.Lex();
988
989 const char *End = getTok().getLoc().getPointer();
990 return StringRef(Start, End - Start);
991}
992
993StringRef AsmParser::parseStringToComma() {
994 const char *Start = getTok().getLoc().getPointer();
995
996 while (Lexer.isNot(AsmToken::EndOfStatement) &&
997 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
998 Lexer.Lex();
999
1000 const char *End = getTok().getLoc().getPointer();
1001 return StringRef(Start, End - Start);
1002}
1003
1004/// Parse a paren expression and return it.
1005/// NOTE: This assumes the leading '(' has already been consumed.
1006///
1007/// parenexpr ::= expr)
1008///
1009bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1010 if (parseExpression(Res))
1011 return true;
1012 if (Lexer.isNot(AsmToken::RParen))
1013 return TokError("expected ')' in parentheses expression");
1014 EndLoc = Lexer.getTok().getEndLoc();
1015 Lex();
1016 return false;
1017}
1018
1019/// Parse a bracket expression and return it.
1020/// NOTE: This assumes the leading '[' has already been consumed.
1021///
1022/// bracketexpr ::= expr]
1023///
1024bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1025 if (parseExpression(Res))
1026 return true;
1027 EndLoc = getTok().getEndLoc();
1028 if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression"))
1029 return true;
1030 return false;
1031}
1032
1033/// Parse a primary expression and return it.
1034/// primaryexpr ::= (parenexpr
1035/// primaryexpr ::= symbol
1036/// primaryexpr ::= number
1037/// primaryexpr ::= '.'
1038/// primaryexpr ::= ~,+,- primaryexpr
1039bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1040 SMLoc FirstTokenLoc = getLexer().getLoc();
1041 AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
1042 switch (FirstTokenKind) {
1043 default:
1044 return TokError("unknown token in expression");
1045 // If we have an error assume that we've already handled it.
1046 case AsmToken::Error:
1047 return true;
1048 case AsmToken::Exclaim:
1049 Lex(); // Eat the operator.
1050 if (parsePrimaryExpr(Res, EndLoc))
1051 return true;
1052 Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc);
1053 return false;
1054 case AsmToken::Dollar:
1055 case AsmToken::At:
1056 case AsmToken::String:
1057 case AsmToken::Identifier: {
1058 StringRef Identifier;
1059 if (parseIdentifier(Identifier)) {
1060 // We may have failed but $ may be a valid token.
1061 if (getTok().is(AsmToken::Dollar)) {
1062 if (Lexer.getMAI().getDollarIsPC()) {
1063 Lex();
1064 // This is a '$' reference, which references the current PC. Emit a
1065 // temporary label to the streamer and refer to it.
1066 MCSymbol *Sym = Ctx.createTempSymbol();
1067 Out.EmitLabel(Sym);
1068 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None,
1069 getContext());
1070 EndLoc = FirstTokenLoc;
1071 return false;
1072 }
1073 return Error(FirstTokenLoc, "invalid token in expression");
1074 }
1075 }
1076 // Parse symbol variant
1077 std::pair<StringRef, StringRef> Split;
1078 if (!MAI.useParensForSymbolVariant()) {
1079 if (FirstTokenKind == AsmToken::String) {
1080 if (Lexer.is(AsmToken::At)) {
1081 Lex(); // eat @
1082 SMLoc AtLoc = getLexer().getLoc();
1083 StringRef VName;
1084 if (parseIdentifier(VName))
1085 return Error(AtLoc, "expected symbol variant after '@'");
1086
1087 Split = std::make_pair(Identifier, VName);
1088 }
1089 } else {
1090 Split = Identifier.split('@');
1091 }
1092 } else if (Lexer.is(AsmToken::LParen)) {
1093 Lex(); // eat '('.
1094 StringRef VName;
1095 parseIdentifier(VName);
1096 // eat ')'.
1097 if (parseToken(AsmToken::RParen,
1098 "unexpected token in variant, expected ')'"))
1099 return true;
1100 Split = std::make_pair(Identifier, VName);
1101 }
1102
1103 EndLoc = SMLoc::getFromPointer(Identifier.end());
1104
1105 // This is a symbol reference.
1106 StringRef SymbolName = Identifier;
1107 if (SymbolName.empty())
1108 return Error(getLexer().getLoc(), "expected a symbol reference");
1109
1110 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
1111
1112 // Lookup the symbol variant if used.
1113 if (!Split.second.empty()) {
1114 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
1115 if (Variant != MCSymbolRefExpr::VK_Invalid) {
1116 SymbolName = Split.first;
1117 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) {
1118 Variant = MCSymbolRefExpr::VK_None;
1119 } else {
1120 return Error(SMLoc::getFromPointer(Split.second.begin()),
1121 "invalid variant '" + Split.second + "'");
1122 }
1123 }
1124
1125 MCSymbol *Sym = getContext().getOrCreateSymbol(SymbolName);
1126
1127 // If this is an absolute variable reference, substitute it now to preserve
1128 // semantics in the face of reassignment.
1129 if (Sym->isVariable()) {
1130 auto V = Sym->getVariableValue(/*SetUsed*/ false);
1131 bool DoInline = isa<MCConstantExpr>(V) && !Variant;
1132 if (auto TV = dyn_cast<MCTargetExpr>(V))
1133 DoInline = TV->inlineAssignedExpr();
1134 if (DoInline) {
1135 if (Variant)
1136 return Error(EndLoc, "unexpected modifier on variable reference");
1137 Res = Sym->getVariableValue(/*SetUsed*/ false);
1138 return false;
1139 }
1140 }
1141
1142 // Otherwise create a symbol ref.
1143 Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc);
1144 return false;
1145 }
1146 case AsmToken::BigNum:
1147 return TokError("literal value out of range for directive");
1148 case AsmToken::Integer: {
1149 SMLoc Loc = getTok().getLoc();
1150 int64_t IntVal = getTok().getIntVal();
1151 Res = MCConstantExpr::create(IntVal, getContext());
1152 EndLoc = Lexer.getTok().getEndLoc();
1153 Lex(); // Eat token.
1154 // Look for 'b' or 'f' following an Integer as a directional label
1155 if (Lexer.getKind() == AsmToken::Identifier) {
1156 StringRef IDVal = getTok().getString();
1157 // Lookup the symbol variant if used.
1158 std::pair<StringRef, StringRef> Split = IDVal.split('@');
1159 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
1160 if (Split.first.size() != IDVal.size()) {
1161 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
1162 if (Variant == MCSymbolRefExpr::VK_Invalid)
1163 return TokError("invalid variant '" + Split.second + "'");
1164 IDVal = Split.first;
1165 }
1166 if (IDVal == "f" || IDVal == "b") {
1167 MCSymbol *Sym =
1168 Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b");
1169 Res = MCSymbolRefExpr::create(Sym, Variant, getContext());
1170 if (IDVal == "b" && Sym->isUndefined())
1171 return Error(Loc, "directional label undefined");
1172 DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym));
1173 EndLoc = Lexer.getTok().getEndLoc();
1174 Lex(); // Eat identifier.
1175 }
1176 }
1177 return false;
1178 }
1179 case AsmToken::Real: {
1180 APFloat RealVal(APFloat::IEEEdouble(), getTok().getString());
1181 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
1182 Res = MCConstantExpr::create(IntVal, getContext());
1183 EndLoc = Lexer.getTok().getEndLoc();
1184 Lex(); // Eat token.
1185 return false;
1186 }
1187 case AsmToken::Dot: {
1188 // This is a '.' reference, which references the current PC. Emit a
1189 // temporary label to the streamer and refer to it.
1190 MCSymbol *Sym = Ctx.createTempSymbol();
1191 Out.EmitLabel(Sym);
1192 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
1193 EndLoc = Lexer.getTok().getEndLoc();
1194 Lex(); // Eat identifier.
1195 return false;
1196 }
1197 case AsmToken::LParen:
1198 Lex(); // Eat the '('.
1199 return parseParenExpr(Res, EndLoc);
1200 case AsmToken::LBrac:
1201 if (!PlatformParser->HasBracketExpressions())
1202 return TokError("brackets expression not supported on this target");
1203 Lex(); // Eat the '['.
1204 return parseBracketExpr(Res, EndLoc);
1205 case AsmToken::Minus:
1206 Lex(); // Eat the operator.
1207 if (parsePrimaryExpr(Res, EndLoc))
1208 return true;
1209 Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc);
1210 return false;
1211 case AsmToken::Plus:
1212 Lex(); // Eat the operator.
1213 if (parsePrimaryExpr(Res, EndLoc))
1214 return true;
1215 Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc);
1216 return false;
1217 case AsmToken::Tilde:
1218 Lex(); // Eat the operator.
1219 if (parsePrimaryExpr(Res, EndLoc))
1220 return true;
1221 Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc);
1222 return false;
1223 // MIPS unary expression operators. The lexer won't generate these tokens if
1224 // MCAsmInfo::HasMipsExpressions is false for the target.
1225 case AsmToken::PercentCall16:
1226 case AsmToken::PercentCall_Hi:
1227 case AsmToken::PercentCall_Lo:
1228 case AsmToken::PercentDtprel_Hi:
1229 case AsmToken::PercentDtprel_Lo:
1230 case AsmToken::PercentGot:
1231 case AsmToken::PercentGot_Disp:
1232 case AsmToken::PercentGot_Hi:
1233 case AsmToken::PercentGot_Lo:
1234 case AsmToken::PercentGot_Ofst:
1235 case AsmToken::PercentGot_Page:
1236 case AsmToken::PercentGottprel:
1237 case AsmToken::PercentGp_Rel:
1238 case AsmToken::PercentHi:
1239 case AsmToken::PercentHigher:
1240 case AsmToken::PercentHighest:
1241 case AsmToken::PercentLo:
1242 case AsmToken::PercentNeg:
1243 case AsmToken::PercentPcrel_Hi:
1244 case AsmToken::PercentPcrel_Lo:
1245 case AsmToken::PercentTlsgd:
1246 case AsmToken::PercentTlsldm:
1247 case AsmToken::PercentTprel_Hi:
1248 case AsmToken::PercentTprel_Lo:
1249 Lex(); // Eat the operator.
1250 if (Lexer.isNot(AsmToken::LParen))
1251 return TokError("expected '(' after operator");
1252 Lex(); // Eat the operator.
1253 if (parseExpression(Res, EndLoc))
1254 return true;
1255 if (Lexer.isNot(AsmToken::RParen))
1256 return TokError("expected ')'");
1257 Lex(); // Eat the operator.
1258 Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx);
1259 return !Res;
1260 }
1261}
1262
1263bool AsmParser::parseExpression(const MCExpr *&Res) {
1264 SMLoc EndLoc;
1265 return parseExpression(Res, EndLoc);
1266}
1267
1268const MCExpr *
1269AsmParser::applyModifierToExpr(const MCExpr *E,
1270 MCSymbolRefExpr::VariantKind Variant) {
1271 // Ask the target implementation about this expression first.
1272 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
1273 if (NewE)
1274 return NewE;
1275 // Recurse over the given expression, rebuilding it to apply the given variant
1276 // if there is exactly one symbol.
1277 switch (E->getKind()) {
1278 case MCExpr::Target:
1279 case MCExpr::Constant:
1280 return nullptr;
1281
1282 case MCExpr::SymbolRef: {
1283 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
1284
1285 if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
1286 TokError("invalid variant on expression '" + getTok().getIdentifier() +
1287 "' (already modified)");
1288 return E;
1289 }
1290
1291 return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext());
1292 }
1293
1294 case MCExpr::Unary: {
1295 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
1296 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
1297 if (!Sub)
1298 return nullptr;
1299 return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext());
1300 }
1301
1302 case MCExpr::Binary: {
1303 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
1304 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
1305 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
1306
1307 if (!LHS && !RHS)
1308 return nullptr;
1309
1310 if (!LHS)
1311 LHS = BE->getLHS();
1312 if (!RHS)
1313 RHS = BE->getRHS();
1314
1315 return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext());
1316 }
1317 }
1318
1319 llvm_unreachable("Invalid expression kind!")::llvm::llvm_unreachable_internal("Invalid expression kind!",
"/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 1319)
;
1320}
1321
1322/// This function checks if the next token is <string> type or arithmetic.
1323/// string that begin with character '<' must end with character '>'.
1324/// otherwise it is arithmetics.
1325/// If the function returns a 'true' value,
1326/// the End argument will be filled with the last location pointed to the '>'
1327/// character.
1328
1329/// There is a gap between the AltMacro's documentation and the single quote
1330/// implementation. GCC does not fully support this feature and so we will not
1331/// support it.
1332/// TODO: Adding single quote as a string.
1333static bool isAltmacroString(SMLoc &StrLoc, SMLoc &EndLoc) {
1334 assert((StrLoc.getPointer() != nullptr) &&(((StrLoc.getPointer() != nullptr) && "Argument to the function cannot be a NULL value"
) ? static_cast<void> (0) : __assert_fail ("(StrLoc.getPointer() != nullptr) && \"Argument to the function cannot be a NULL value\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 1335, __PRETTY_FUNCTION__))
1335 "Argument to the function cannot be a NULL value")(((StrLoc.getPointer() != nullptr) && "Argument to the function cannot be a NULL value"
) ? static_cast<void> (0) : __assert_fail ("(StrLoc.getPointer() != nullptr) && \"Argument to the function cannot be a NULL value\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 1335, __PRETTY_FUNCTION__))
;
1336 const char *CharPtr = StrLoc.getPointer();
1337 while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') &&
1338 (*CharPtr != '\0')) {
1339 if (*CharPtr == '!')
1340 CharPtr++;
1341 CharPtr++;
1342 }
1343 if (*CharPtr == '>') {
1344 EndLoc = StrLoc.getFromPointer(CharPtr + 1);
1345 return true;
1346 }
1347 return false;
1348}
1349
1350/// creating a string without the escape characters '!'.
1351static std::string altMacroString(StringRef AltMacroStr) {
1352 std::string Res;
1353 for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) {
1354 if (AltMacroStr[Pos] == '!')
1355 Pos++;
1356 Res += AltMacroStr[Pos];
1357 }
1358 return Res;
1359}
1360
1361/// Parse an expression and return it.
1362///
1363/// expr ::= expr &&,|| expr -> lowest.
1364/// expr ::= expr |,^,&,! expr
1365/// expr ::= expr ==,!=,<>,<,<=,>,>= expr
1366/// expr ::= expr <<,>> expr
1367/// expr ::= expr +,- expr
1368/// expr ::= expr *,/,% expr -> highest.
1369/// expr ::= primaryexpr
1370///
1371bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1372 // Parse the expression.
1373 Res = nullptr;
1374 if (getTargetParser().parsePrimaryExpr(Res, EndLoc) ||
1375 parseBinOpRHS(1, Res, EndLoc))
1376 return true;
1377
1378 // As a special case, we support 'a op b @ modifier' by rewriting the
1379 // expression to include the modifier. This is inefficient, but in general we
1380 // expect users to use 'a@modifier op b'.
1381 if (Lexer.getKind() == AsmToken::At) {
1382 Lex();
1383
1384 if (Lexer.isNot(AsmToken::Identifier))
1385 return TokError("unexpected symbol modifier following '@'");
1386
1387 MCSymbolRefExpr::VariantKind Variant =
1388 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
1389 if (Variant == MCSymbolRefExpr::VK_Invalid)
1390 return TokError("invalid variant '" + getTok().getIdentifier() + "'");
1391
1392 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
1393 if (!ModifiedRes) {
1394 return TokError("invalid modifier '" + getTok().getIdentifier() +
1395 "' (no symbols present)");
1396 }
1397
1398 Res = ModifiedRes;
1399 Lex();
1400 }
1401
1402 // Try to constant fold it up front, if possible. Do not exploit
1403 // assembler here.
1404 int64_t Value;
1405 if (Res->evaluateAsAbsolute(Value))
1406 Res = MCConstantExpr::create(Value, getContext());
1407
1408 return false;
1409}
1410
1411bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1412 Res = nullptr;
1413 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1414}
1415
1416bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
1417 SMLoc &EndLoc) {
1418 if (parseParenExpr(Res, EndLoc))
1419 return true;
1420
1421 for (; ParenDepth > 0; --ParenDepth) {
1422 if (parseBinOpRHS(1, Res, EndLoc))
1423 return true;
1424
1425 // We don't Lex() the last RParen.
1426 // This is the same behavior as parseParenExpression().
1427 if (ParenDepth - 1 > 0) {
1428 EndLoc = getTok().getEndLoc();
1429 if (parseToken(AsmToken::RParen,
1430 "expected ')' in parentheses expression"))
1431 return true;
1432 }
1433 }
1434 return false;
1435}
1436
1437bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1438 const MCExpr *Expr;
1439
1440 SMLoc StartLoc = Lexer.getLoc();
1441 if (parseExpression(Expr))
1442 return true;
1443
1444 if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
1445 return Error(StartLoc, "expected absolute expression");
1446
1447 return false;
1448}
1449
1450static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K,
1451 MCBinaryExpr::Opcode &Kind,
1452 bool ShouldUseLogicalShr) {
1453 switch (K) {
1454 default:
1455 return 0; // not a binop.
1456
1457 // Lowest Precedence: &&, ||
1458 case AsmToken::AmpAmp:
1459 Kind = MCBinaryExpr::LAnd;
1460 return 1;
1461 case AsmToken::PipePipe:
1462 Kind = MCBinaryExpr::LOr;
1463 return 1;
1464
1465 // Low Precedence: |, &, ^
1466 //
1467 // FIXME: gas seems to support '!' as an infix operator?
1468 case AsmToken::Pipe:
1469 Kind = MCBinaryExpr::Or;
1470 return 2;
1471 case AsmToken::Caret:
1472 Kind = MCBinaryExpr::Xor;
1473 return 2;
1474 case AsmToken::Amp:
1475 Kind = MCBinaryExpr::And;
1476 return 2;
1477
1478 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1479 case AsmToken::EqualEqual:
1480 Kind = MCBinaryExpr::EQ;
1481 return 3;
1482 case AsmToken::ExclaimEqual:
1483 case AsmToken::LessGreater:
1484 Kind = MCBinaryExpr::NE;
1485 return 3;
1486 case AsmToken::Less:
1487 Kind = MCBinaryExpr::LT;
1488 return 3;
1489 case AsmToken::LessEqual:
1490 Kind = MCBinaryExpr::LTE;
1491 return 3;
1492 case AsmToken::Greater:
1493 Kind = MCBinaryExpr::GT;
1494 return 3;
1495 case AsmToken::GreaterEqual:
1496 Kind = MCBinaryExpr::GTE;
1497 return 3;
1498
1499 // Intermediate Precedence: <<, >>
1500 case AsmToken::LessLess:
1501 Kind = MCBinaryExpr::Shl;
1502 return 4;
1503 case AsmToken::GreaterGreater:
1504 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1505 return 4;
1506
1507 // High Intermediate Precedence: +, -
1508 case AsmToken::Plus:
1509 Kind = MCBinaryExpr::Add;
1510 return 5;
1511 case AsmToken::Minus:
1512 Kind = MCBinaryExpr::Sub;
1513 return 5;
1514
1515 // Highest Precedence: *, /, %
1516 case AsmToken::Star:
1517 Kind = MCBinaryExpr::Mul;
1518 return 6;
1519 case AsmToken::Slash:
1520 Kind = MCBinaryExpr::Div;
1521 return 6;
1522 case AsmToken::Percent:
1523 Kind = MCBinaryExpr::Mod;
1524 return 6;
1525 }
1526}
1527
1528static unsigned getGNUBinOpPrecedence(AsmToken::TokenKind K,
1529 MCBinaryExpr::Opcode &Kind,
1530 bool ShouldUseLogicalShr) {
1531 switch (K) {
1532 default:
1533 return 0; // not a binop.
1534
1535 // Lowest Precedence: &&, ||
1536 case AsmToken::AmpAmp:
1537 Kind = MCBinaryExpr::LAnd;
1538 return 2;
1539 case AsmToken::PipePipe:
1540 Kind = MCBinaryExpr::LOr;
1541 return 1;
1542
1543 // Low Precedence: ==, !=, <>, <, <=, >, >=
1544 case AsmToken::EqualEqual:
1545 Kind = MCBinaryExpr::EQ;
1546 return 3;
1547 case AsmToken::ExclaimEqual:
1548 case AsmToken::LessGreater:
1549 Kind = MCBinaryExpr::NE;
1550 return 3;
1551 case AsmToken::Less:
1552 Kind = MCBinaryExpr::LT;
1553 return 3;
1554 case AsmToken::LessEqual:
1555 Kind = MCBinaryExpr::LTE;
1556 return 3;
1557 case AsmToken::Greater:
1558 Kind = MCBinaryExpr::GT;
1559 return 3;
1560 case AsmToken::GreaterEqual:
1561 Kind = MCBinaryExpr::GTE;
1562 return 3;
1563
1564 // Low Intermediate Precedence: +, -
1565 case AsmToken::Plus:
1566 Kind = MCBinaryExpr::Add;
1567 return 4;
1568 case AsmToken::Minus:
1569 Kind = MCBinaryExpr::Sub;
1570 return 4;
1571
1572 // High Intermediate Precedence: |, &, ^
1573 //
1574 // FIXME: gas seems to support '!' as an infix operator?
1575 case AsmToken::Pipe:
1576 Kind = MCBinaryExpr::Or;
1577 return 5;
1578 case AsmToken::Caret:
1579 Kind = MCBinaryExpr::Xor;
1580 return 5;
1581 case AsmToken::Amp:
1582 Kind = MCBinaryExpr::And;
1583 return 5;
1584
1585 // Highest Precedence: *, /, %, <<, >>
1586 case AsmToken::Star:
1587 Kind = MCBinaryExpr::Mul;
1588 return 6;
1589 case AsmToken::Slash:
1590 Kind = MCBinaryExpr::Div;
1591 return 6;
1592 case AsmToken::Percent:
1593 Kind = MCBinaryExpr::Mod;
1594 return 6;
1595 case AsmToken::LessLess:
1596 Kind = MCBinaryExpr::Shl;
1597 return 6;
1598 case AsmToken::GreaterGreater:
1599 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1600 return 6;
1601 }
1602}
1603
1604unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K,
1605 MCBinaryExpr::Opcode &Kind) {
1606 bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr();
1607 return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr)
1608 : getGNUBinOpPrecedence(K, Kind, ShouldUseLogicalShr);
1609}
1610
1611/// Parse all binary operators with precedence >= 'Precedence'.
1612/// Res contains the LHS of the expression on input.
1613bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1614 SMLoc &EndLoc) {
1615 SMLoc StartLoc = Lexer.getLoc();
1616 while (true) {
1617 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1618 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1619
1620 // If the next token is lower precedence than we are allowed to eat, return
1621 // successfully with what we ate already.
1622 if (TokPrec < Precedence)
1623 return false;
1624
1625 Lex();
1626
1627 // Eat the next primary expression.
1628 const MCExpr *RHS;
1629 if (getTargetParser().parsePrimaryExpr(RHS, EndLoc))
1630 return true;
1631
1632 // If BinOp binds less tightly with RHS than the operator after RHS, let
1633 // the pending operator take RHS as its LHS.
1634 MCBinaryExpr::Opcode Dummy;
1635 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1636 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1637 return true;
1638
1639 // Merge LHS and RHS according to operator.
1640 Res = MCBinaryExpr::create(Kind, Res, RHS, getContext(), StartLoc);
1641 }
1642}
1643
1644/// ParseStatement:
1645/// ::= EndOfStatement
1646/// ::= Label* Directive ...Operands... EndOfStatement
1647/// ::= Label* Identifier OperandList* EndOfStatement
1648bool AsmParser::parseStatement(ParseStatementInfo &Info,
1649 MCAsmParserSemaCallback *SI) {
1650 assert(!hasPendingError() && "parseStatement started with pending error")((!hasPendingError() && "parseStatement started with pending error"
) ? static_cast<void> (0) : __assert_fail ("!hasPendingError() && \"parseStatement started with pending error\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 1650, __PRETTY_FUNCTION__))
;
1651 // Eat initial spaces and comments
1652 while (Lexer.is(AsmToken::Space))
1653 Lex();
1654 if (Lexer.is(AsmToken::EndOfStatement)) {
1655 // if this is a line comment we can drop it safely
1656 if (getTok().getString().empty() || getTok().getString().front() == '\r' ||
1657 getTok().getString().front() == '\n')
1658 Out.AddBlankLine();
1659 Lex();
1660 return false;
1661 }
1662 // Statements always start with an identifier.
1663 AsmToken ID = getTok();
1664 SMLoc IDLoc = ID.getLoc();
1665 StringRef IDVal;
1666 int64_t LocalLabelVal = -1;
1667 if (Lexer.is(AsmToken::HashDirective))
1668 return parseCppHashLineFilenameComment(IDLoc);
1669 // Allow an integer followed by a ':' as a directional local label.
1670 if (Lexer.is(AsmToken::Integer)) {
1671 LocalLabelVal = getTok().getIntVal();
1672 if (LocalLabelVal < 0) {
1673 if (!TheCondState.Ignore) {
1674 Lex(); // always eat a token
1675 return Error(IDLoc, "unexpected token at start of statement");
1676 }
1677 IDVal = "";
1678 } else {
1679 IDVal = getTok().getString();
1680 Lex(); // Consume the integer token to be used as an identifier token.
1681 if (Lexer.getKind() != AsmToken::Colon) {
1682 if (!TheCondState.Ignore) {
1683 Lex(); // always eat a token
1684 return Error(IDLoc, "unexpected token at start of statement");
1685 }
1686 }
1687 }
1688 } else if (Lexer.is(AsmToken::Dot)) {
1689 // Treat '.' as a valid identifier in this context.
1690 Lex();
1691 IDVal = ".";
1692 } else if (Lexer.is(AsmToken::LCurly)) {
1693 // Treat '{' as a valid identifier in this context.
1694 Lex();
1695 IDVal = "{";
1696
1697 } else if (Lexer.is(AsmToken::RCurly)) {
1698 // Treat '}' as a valid identifier in this context.
1699 Lex();
1700 IDVal = "}";
1701 } else if (Lexer.is(AsmToken::Star) &&
1702 getTargetParser().starIsStartOfStatement()) {
1703 // Accept '*' as a valid start of statement.
1704 Lex();
1705 IDVal = "*";
1706 } else if (parseIdentifier(IDVal)) {
1707 if (!TheCondState.Ignore) {
1708 Lex(); // always eat a token
1709 return Error(IDLoc, "unexpected token at start of statement");
1710 }
1711 IDVal = "";
1712 }
1713
1714 // Handle conditional assembly here before checking for skipping. We
1715 // have to do this so that .endif isn't skipped in a ".if 0" block for
1716 // example.
1717 StringMap<DirectiveKind>::const_iterator DirKindIt =
1718 DirectiveKindMap.find(IDVal);
1719 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1720 ? DK_NO_DIRECTIVE
1721 : DirKindIt->getValue();
1722 switch (DirKind) {
1723 default:
1724 break;
1725 case DK_IF:
1726 case DK_IFEQ:
1727 case DK_IFGE:
1728 case DK_IFGT:
1729 case DK_IFLE:
1730 case DK_IFLT:
1731 case DK_IFNE:
1732 return parseDirectiveIf(IDLoc, DirKind);
1733 case DK_IFB:
1734 return parseDirectiveIfb(IDLoc, true);
1735 case DK_IFNB:
1736 return parseDirectiveIfb(IDLoc, false);
1737 case DK_IFC:
1738 return parseDirectiveIfc(IDLoc, true);
1739 case DK_IFEQS:
1740 return parseDirectiveIfeqs(IDLoc, true);
1741 case DK_IFNC:
1742 return parseDirectiveIfc(IDLoc, false);
1743 case DK_IFNES:
1744 return parseDirectiveIfeqs(IDLoc, false);
1745 case DK_IFDEF:
1746 return parseDirectiveIfdef(IDLoc, true);
1747 case DK_IFNDEF:
1748 case DK_IFNOTDEF:
1749 return parseDirectiveIfdef(IDLoc, false);
1750 case DK_ELSEIF:
1751 return parseDirectiveElseIf(IDLoc);
1752 case DK_ELSE:
1753 return parseDirectiveElse(IDLoc);
1754 case DK_ENDIF:
1755 return parseDirectiveEndIf(IDLoc);
1756 }
1757
1758 // Ignore the statement if in the middle of inactive conditional
1759 // (e.g. ".if 0").
1760 if (TheCondState.Ignore) {
1761 eatToEndOfStatement();
1762 return false;
1763 }
1764
1765 // FIXME: Recurse on local labels?
1766
1767 // See what kind of statement we have.
1768 switch (Lexer.getKind()) {
1769 case AsmToken::Colon: {
1770 if (!getTargetParser().isLabel(ID))
1771 break;
1772 if (checkForValidSection())
1773 return true;
1774
1775 // identifier ':' -> Label.
1776 Lex();
1777
1778 // Diagnose attempt to use '.' as a label.
1779 if (IDVal == ".")
1780 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1781
1782 // Diagnose attempt to use a variable as a label.
1783 //
1784 // FIXME: Diagnostics. Note the location of the definition as a label.
1785 // FIXME: This doesn't diagnose assignment to a symbol which has been
1786 // implicitly marked as external.
1787 MCSymbol *Sym;
1788 if (LocalLabelVal == -1) {
1789 if (ParsingInlineAsm && SI) {
1790 StringRef RewrittenLabel =
1791 SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
1792 assert(!RewrittenLabel.empty() &&((!RewrittenLabel.empty() && "We should have an internal name here."
) ? static_cast<void> (0) : __assert_fail ("!RewrittenLabel.empty() && \"We should have an internal name here.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 1793, __PRETTY_FUNCTION__))
1793 "We should have an internal name here.")((!RewrittenLabel.empty() && "We should have an internal name here."
) ? static_cast<void> (0) : __assert_fail ("!RewrittenLabel.empty() && \"We should have an internal name here.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 1793, __PRETTY_FUNCTION__))
;
1794 Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(),
1795 RewrittenLabel);
1796 IDVal = RewrittenLabel;
1797 }
1798 Sym = getContext().getOrCreateSymbol(IDVal);
1799 } else
1800 Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal);
1801 // End of Labels should be treated as end of line for lexing
1802 // purposes but that information is not available to the Lexer who
1803 // does not understand Labels. This may cause us to see a Hash
1804 // here instead of a preprocessor line comment.
1805 if (getTok().is(AsmToken::Hash)) {
1806 StringRef CommentStr = parseStringToEndOfStatement();
1807 Lexer.Lex();
1808 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr));
1809 }
1810
1811 // Consume any end of statement token, if present, to avoid spurious
1812 // AddBlankLine calls().
1813 if (getTok().is(AsmToken::EndOfStatement)) {
1814 Lex();
1815 }
1816
1817 getTargetParser().doBeforeLabelEmit(Sym);
1818
1819 // Emit the label.
1820 if (!getTargetParser().isParsingInlineAsm())
1821 Out.EmitLabel(Sym, IDLoc);
1822
1823 // If we are generating dwarf for assembly source files then gather the
1824 // info to make a dwarf label entry for this label if needed.
1825 if (enabledGenDwarfForAssembly())
1826 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1827 IDLoc);
1828
1829 getTargetParser().onLabelParsed(Sym);
1830
1831 return false;
1832 }
1833
1834 case AsmToken::Equal:
1835 if (!getTargetParser().equalIsAsmAssignment())
1836 break;
1837 // identifier '=' ... -> assignment statement
1838 Lex();
1839
1840 return parseAssignment(IDVal, true);
1841
1842 default: // Normal instruction or directive.
1843 break;
1844 }
1845
1846 // If macros are enabled, check to see if this is a macro instantiation.
1847 if (areMacrosEnabled())
1848 if (const MCAsmMacro *M = getContext().lookupMacro(IDVal)) {
1849 return handleMacroEntry(M, IDLoc);
1850 }
1851
1852 // Otherwise, we have a normal instruction or directive.
1853
1854 // Directives start with "."
1855 if (IDVal.startswith(".") && IDVal != ".") {
1856 // There are several entities interested in parsing directives:
1857 //
1858 // 1. The target-specific assembly parser. Some directives are target
1859 // specific or may potentially behave differently on certain targets.
1860 // 2. Asm parser extensions. For example, platform-specific parsers
1861 // (like the ELF parser) register themselves as extensions.
1862 // 3. The generic directive parser implemented by this class. These are
1863 // all the directives that behave in a target and platform independent
1864 // manner, or at least have a default behavior that's shared between
1865 // all targets and platforms.
1866
1867 getTargetParser().flushPendingInstructions(getStreamer());
1868
1869 SMLoc StartTokLoc = getTok().getLoc();
1870 bool TPDirectiveReturn = getTargetParser().ParseDirective(ID);
1871
1872 if (hasPendingError())
1873 return true;
1874 // Currently the return value should be true if we are
1875 // uninterested but as this is at odds with the standard parsing
1876 // convention (return true = error) we have instances of a parsed
1877 // directive that fails returning true as an error. Catch these
1878 // cases as best as possible errors here.
1879 if (TPDirectiveReturn && StartTokLoc != getTok().getLoc())
1880 return true;
1881 // Return if we did some parsing or believe we succeeded.
1882 if (!TPDirectiveReturn || StartTokLoc != getTok().getLoc())
1883 return false;
1884
1885 // Next, check the extension directive map to see if any extension has
1886 // registered itself to parse this directive.
1887 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
1888 ExtensionDirectiveMap.lookup(IDVal);
1889 if (Handler.first)
1890 return (*Handler.second)(Handler.first, IDVal, IDLoc);
1891
1892 // Finally, if no one else is interested in this directive, it must be
1893 // generic and familiar to this class.
1894 switch (DirKind) {
1895 default:
1896 break;
1897 case DK_SET:
1898 case DK_EQU:
1899 return parseDirectiveSet(IDVal, true);
1900 case DK_EQUIV:
1901 return parseDirectiveSet(IDVal, false);
1902 case DK_ASCII:
1903 return parseDirectiveAscii(IDVal, false);
1904 case DK_ASCIZ:
1905 case DK_STRING:
1906 return parseDirectiveAscii(IDVal, true);
1907 case DK_BYTE:
1908 case DK_DC_B:
1909 return parseDirectiveValue(IDVal, 1);
1910 case DK_DC:
1911 case DK_DC_W:
1912 case DK_SHORT:
1913 case DK_VALUE:
1914 case DK_2BYTE:
1915 return parseDirectiveValue(IDVal, 2);
1916 case DK_LONG:
1917 case DK_INT:
1918 case DK_4BYTE:
1919 case DK_DC_L:
1920 return parseDirectiveValue(IDVal, 4);
1921 case DK_QUAD:
1922 case DK_8BYTE:
1923 return parseDirectiveValue(IDVal, 8);
1924 case DK_DC_A:
1925 return parseDirectiveValue(
1926 IDVal, getContext().getAsmInfo()->getCodePointerSize());
1927 case DK_OCTA:
1928 return parseDirectiveOctaValue(IDVal);
1929 case DK_SINGLE:
1930 case DK_FLOAT:
1931 case DK_DC_S:
1932 return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle());
1933 case DK_DOUBLE:
1934 case DK_DC_D:
1935 return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble());
1936 case DK_ALIGN: {
1937 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1938 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1939 }
1940 case DK_ALIGN32: {
1941 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1942 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1943 }
1944 case DK_BALIGN:
1945 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1946 case DK_BALIGNW:
1947 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1948 case DK_BALIGNL:
1949 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1950 case DK_P2ALIGN:
1951 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1952 case DK_P2ALIGNW:
1953 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1954 case DK_P2ALIGNL:
1955 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1956 case DK_ORG:
1957 return parseDirectiveOrg();
1958 case DK_FILL:
1959 return parseDirectiveFill();
1960 case DK_ZERO:
1961 return parseDirectiveZero();
1962 case DK_EXTERN:
1963 eatToEndOfStatement(); // .extern is the default, ignore it.
1964 return false;
1965 case DK_GLOBL:
1966 case DK_GLOBAL:
1967 return parseDirectiveSymbolAttribute(MCSA_Global);
1968 case DK_LAZY_REFERENCE:
1969 return parseDirectiveSymbolAttribute(MCSA_LazyReference);
1970 case DK_NO_DEAD_STRIP:
1971 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1972 case DK_SYMBOL_RESOLVER:
1973 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1974 case DK_PRIVATE_EXTERN:
1975 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1976 case DK_REFERENCE:
1977 return parseDirectiveSymbolAttribute(MCSA_Reference);
1978 case DK_WEAK_DEFINITION:
1979 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
1980 case DK_WEAK_REFERENCE:
1981 return parseDirectiveSymbolAttribute(MCSA_WeakReference);
1982 case DK_WEAK_DEF_CAN_BE_HIDDEN:
1983 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
1984 case DK_COMM:
1985 case DK_COMMON:
1986 return parseDirectiveComm(/*IsLocal=*/false);
1987 case DK_LCOMM:
1988 return parseDirectiveComm(/*IsLocal=*/true);
1989 case DK_ABORT:
1990 return parseDirectiveAbort();
1991 case DK_INCLUDE:
1992 return parseDirectiveInclude();
1993 case DK_INCBIN:
1994 return parseDirectiveIncbin();
1995 case DK_CODE16:
1996 case DK_CODE16GCC:
1997 return TokError(Twine(IDVal) +
1998 " not currently supported for this target");
1999 case DK_REPT:
2000 return parseDirectiveRept(IDLoc, IDVal);
2001 case DK_IRP:
2002 return parseDirectiveIrp(IDLoc);
2003 case DK_IRPC:
2004 return parseDirectiveIrpc(IDLoc);
2005 case DK_ENDR:
2006 return parseDirectiveEndr(IDLoc);
2007 case DK_BUNDLE_ALIGN_MODE:
2008 return parseDirectiveBundleAlignMode();
2009 case DK_BUNDLE_LOCK:
2010 return parseDirectiveBundleLock();
2011 case DK_BUNDLE_UNLOCK:
2012 return parseDirectiveBundleUnlock();
2013 case DK_SLEB128:
2014 return parseDirectiveLEB128(true);
2015 case DK_ULEB128:
2016 return parseDirectiveLEB128(false);
2017 case DK_SPACE:
2018 case DK_SKIP:
2019 return parseDirectiveSpace(IDVal);
2020 case DK_FILE:
2021 return parseDirectiveFile(IDLoc);
2022 case DK_LINE:
2023 return parseDirectiveLine();
2024 case DK_LOC:
2025 return parseDirectiveLoc();
2026 case DK_STABS:
2027 return parseDirectiveStabs();
2028 case DK_CV_FILE:
2029 return parseDirectiveCVFile();
2030 case DK_CV_FUNC_ID:
2031 return parseDirectiveCVFuncId();
2032 case DK_CV_INLINE_SITE_ID:
2033 return parseDirectiveCVInlineSiteId();
2034 case DK_CV_LOC:
2035 return parseDirectiveCVLoc();
2036 case DK_CV_LINETABLE:
2037 return parseDirectiveCVLinetable();
2038 case DK_CV_INLINE_LINETABLE:
2039 return parseDirectiveCVInlineLinetable();
2040 case DK_CV_DEF_RANGE:
2041 return parseDirectiveCVDefRange();
2042 case DK_CV_STRING:
2043 return parseDirectiveCVString();
2044 case DK_CV_STRINGTABLE:
2045 return parseDirectiveCVStringTable();
2046 case DK_CV_FILECHECKSUMS:
2047 return parseDirectiveCVFileChecksums();
2048 case DK_CV_FILECHECKSUM_OFFSET:
2049 return parseDirectiveCVFileChecksumOffset();
2050 case DK_CV_FPO_DATA:
2051 return parseDirectiveCVFPOData();
2052 case DK_CFI_SECTIONS:
2053 return parseDirectiveCFISections();
2054 case DK_CFI_STARTPROC:
2055 return parseDirectiveCFIStartProc();
2056 case DK_CFI_ENDPROC:
2057 return parseDirectiveCFIEndProc();
2058 case DK_CFI_DEF_CFA:
2059 return parseDirectiveCFIDefCfa(IDLoc);
2060 case DK_CFI_DEF_CFA_OFFSET:
2061 return parseDirectiveCFIDefCfaOffset();
2062 case DK_CFI_ADJUST_CFA_OFFSET:
2063 return parseDirectiveCFIAdjustCfaOffset();
2064 case DK_CFI_DEF_CFA_REGISTER:
2065 return parseDirectiveCFIDefCfaRegister(IDLoc);
2066 case DK_CFI_OFFSET:
2067 return parseDirectiveCFIOffset(IDLoc);
2068 case DK_CFI_REL_OFFSET:
2069 return parseDirectiveCFIRelOffset(IDLoc);
2070 case DK_CFI_PERSONALITY:
2071 return parseDirectiveCFIPersonalityOrLsda(true);
2072 case DK_CFI_LSDA:
2073 return parseDirectiveCFIPersonalityOrLsda(false);
2074 case DK_CFI_REMEMBER_STATE:
2075 return parseDirectiveCFIRememberState();
2076 case DK_CFI_RESTORE_STATE:
2077 return parseDirectiveCFIRestoreState();
2078 case DK_CFI_SAME_VALUE:
2079 return parseDirectiveCFISameValue(IDLoc);
2080 case DK_CFI_RESTORE:
2081 return parseDirectiveCFIRestore(IDLoc);
2082 case DK_CFI_ESCAPE:
2083 return parseDirectiveCFIEscape();
2084 case DK_CFI_RETURN_COLUMN:
2085 return parseDirectiveCFIReturnColumn(IDLoc);
2086 case DK_CFI_SIGNAL_FRAME:
2087 return parseDirectiveCFISignalFrame();
2088 case DK_CFI_UNDEFINED:
2089 return parseDirectiveCFIUndefined(IDLoc);
2090 case DK_CFI_REGISTER:
2091 return parseDirectiveCFIRegister(IDLoc);
2092 case DK_CFI_WINDOW_SAVE:
2093 return parseDirectiveCFIWindowSave();
2094 case DK_MACROS_ON:
2095 case DK_MACROS_OFF:
2096 return parseDirectiveMacrosOnOff(IDVal);
2097 case DK_MACRO:
2098 return parseDirectiveMacro(IDLoc);
2099 case DK_ALTMACRO:
2100 case DK_NOALTMACRO:
2101 return parseDirectiveAltmacro(IDVal);
2102 case DK_EXITM:
2103 return parseDirectiveExitMacro(IDVal);
2104 case DK_ENDM:
2105 case DK_ENDMACRO:
2106 return parseDirectiveEndMacro(IDVal);
2107 case DK_PURGEM:
2108 return parseDirectivePurgeMacro(IDLoc);
2109 case DK_END:
2110 return parseDirectiveEnd(IDLoc);
2111 case DK_ERR:
2112 return parseDirectiveError(IDLoc, false);
2113 case DK_ERROR:
2114 return parseDirectiveError(IDLoc, true);
2115 case DK_WARNING:
2116 return parseDirectiveWarning(IDLoc);
2117 case DK_RELOC:
2118 return parseDirectiveReloc(IDLoc);
2119 case DK_DCB:
2120 case DK_DCB_W:
2121 return parseDirectiveDCB(IDVal, 2);
2122 case DK_DCB_B:
2123 return parseDirectiveDCB(IDVal, 1);
2124 case DK_DCB_D:
2125 return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble());
2126 case DK_DCB_L:
2127 return parseDirectiveDCB(IDVal, 4);
2128 case DK_DCB_S:
2129 return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle());
2130 case DK_DC_X:
2131 case DK_DCB_X:
2132 return TokError(Twine(IDVal) +
2133 " not currently supported for this target");
2134 case DK_DS:
2135 case DK_DS_W:
2136 return parseDirectiveDS(IDVal, 2);
2137 case DK_DS_B:
2138 return parseDirectiveDS(IDVal, 1);
2139 case DK_DS_D:
2140 return parseDirectiveDS(IDVal, 8);
2141 case DK_DS_L:
2142 case DK_DS_S:
2143 return parseDirectiveDS(IDVal, 4);
2144 case DK_DS_P:
2145 case DK_DS_X:
2146 return parseDirectiveDS(IDVal, 12);
2147 case DK_PRINT:
2148 return parseDirectivePrint(IDLoc);
2149 case DK_ADDRSIG:
2150 return parseDirectiveAddrsig();
2151 case DK_ADDRSIG_SYM:
2152 return parseDirectiveAddrsigSym();
2153 }
2154
2155 return Error(IDLoc, "unknown directive");
2156 }
2157
2158 // __asm _emit or __asm __emit
2159 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
2160 IDVal == "_EMIT" || IDVal == "__EMIT"))
2161 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
2162
2163 // __asm align
2164 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
2165 return parseDirectiveMSAlign(IDLoc, Info);
2166
2167 if (ParsingInlineAsm && (IDVal == "even" || IDVal == "EVEN"))
2168 Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4);
2169 if (checkForValidSection())
2170 return true;
2171
2172 // Canonicalize the opcode to lower case.
2173 std::string OpcodeStr = IDVal.lower();
2174 ParseInstructionInfo IInfo(Info.AsmRewrites);
2175 bool ParseHadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID,
2176 Info.ParsedOperands);
2177 Info.ParseError = ParseHadError;
2178
2179 // Dump the parsed representation, if requested.
2180 if (getShowParsedOperands()) {
2181 SmallString<256> Str;
2182 raw_svector_ostream OS(Str);
2183 OS << "parsed instruction: [";
2184 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
2185 if (i != 0)
2186 OS << ", ";
2187 Info.ParsedOperands[i]->print(OS);
2188 }
2189 OS << "]";
2190
2191 printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
2192 }
2193
2194 // Fail even if ParseInstruction erroneously returns false.
2195 if (hasPendingError() || ParseHadError)
2196 return true;
2197
2198 // If we are generating dwarf for the current section then generate a .loc
2199 // directive for the instruction.
2200 if (!ParseHadError && enabledGenDwarfForAssembly() &&
2201 getContext().getGenDwarfSectionSyms().count(
2202 getStreamer().getCurrentSectionOnly())) {
2203 unsigned Line;
2204 if (ActiveMacros.empty())
2205 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
2206 else
2207 Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc,
2208 ActiveMacros.front()->ExitBuffer);
2209
2210 // If we previously parsed a cpp hash file line comment then make sure the
2211 // current Dwarf File is for the CppHashFilename if not then emit the
2212 // Dwarf File table for it and adjust the line number for the .loc.
2213 if (!CppHashInfo.Filename.empty()) {
2214 unsigned FileNumber = getStreamer().EmitDwarfFileDirective(
2215 0, StringRef(), CppHashInfo.Filename);
2216 getContext().setGenDwarfFileNumber(FileNumber);
2217
2218 unsigned CppHashLocLineNo =
2219 SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf);
2220 Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo);
2221 }
2222
2223 getStreamer().EmitDwarfLocDirective(
2224 getContext().getGenDwarfFileNumber(), Line, 0,
2225 DWARF2_LINE_DEFAULT_IS_STMT1 ? DWARF2_FLAG_IS_STMT(1 << 0) : 0, 0, 0,
2226 StringRef());
2227 }
2228
2229 // If parsing succeeded, match the instruction.
2230 if (!ParseHadError) {
2231 uint64_t ErrorInfo;
2232 if (getTargetParser().MatchAndEmitInstruction(
2233 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo,
2234 getTargetParser().isParsingInlineAsm()))
2235 return true;
2236 }
2237 return false;
2238}
2239
2240// Parse and erase curly braces marking block start/end
2241bool
2242AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) {
2243 // Identify curly brace marking block start/end
2244 if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly))
2245 return false;
2246
2247 SMLoc StartLoc = Lexer.getLoc();
2248 Lex(); // Eat the brace
2249 if (Lexer.is(AsmToken::EndOfStatement))
2250 Lex(); // Eat EndOfStatement following the brace
2251
2252 // Erase the block start/end brace from the output asm string
2253 AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() -
2254 StartLoc.getPointer());
2255 return true;
2256}
2257
2258/// parseCppHashLineFilenameComment as this:
2259/// ::= # number "filename"
2260bool AsmParser::parseCppHashLineFilenameComment(SMLoc L) {
2261 Lex(); // Eat the hash token.
2262 // Lexer only ever emits HashDirective if it fully formed if it's
2263 // done the checking already so this is an internal error.
2264 assert(getTok().is(AsmToken::Integer) &&((getTok().is(AsmToken::Integer) && "Lexing Cpp line comment: Expected Integer"
) ? static_cast<void> (0) : __assert_fail ("getTok().is(AsmToken::Integer) && \"Lexing Cpp line comment: Expected Integer\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 2265, __PRETTY_FUNCTION__))
2265 "Lexing Cpp line comment: Expected Integer")((getTok().is(AsmToken::Integer) && "Lexing Cpp line comment: Expected Integer"
) ? static_cast<void> (0) : __assert_fail ("getTok().is(AsmToken::Integer) && \"Lexing Cpp line comment: Expected Integer\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 2265, __PRETTY_FUNCTION__))
;
2266 int64_t LineNumber = getTok().getIntVal();
2267 Lex();
2268 assert(getTok().is(AsmToken::String) &&((getTok().is(AsmToken::String) && "Lexing Cpp line comment: Expected String"
) ? static_cast<void> (0) : __assert_fail ("getTok().is(AsmToken::String) && \"Lexing Cpp line comment: Expected String\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 2269, __PRETTY_FUNCTION__))
2269 "Lexing Cpp line comment: Expected String")((getTok().is(AsmToken::String) && "Lexing Cpp line comment: Expected String"
) ? static_cast<void> (0) : __assert_fail ("getTok().is(AsmToken::String) && \"Lexing Cpp line comment: Expected String\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 2269, __PRETTY_FUNCTION__))
;
2270 StringRef Filename = getTok().getString();
2271 Lex();
2272
2273 // Get rid of the enclosing quotes.
2274 Filename = Filename.substr(1, Filename.size() - 2);
2275
2276 // Save the SMLoc, Filename and LineNumber for later use by diagnostics.
2277 CppHashInfo.Loc = L;
2278 CppHashInfo.Filename = Filename;
2279 CppHashInfo.LineNumber = LineNumber;
2280 CppHashInfo.Buf = CurBuffer;
2281 return false;
2282}
2283
2284/// will use the last parsed cpp hash line filename comment
2285/// for the Filename and LineNo if any in the diagnostic.
2286void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
2287 const AsmParser *Parser = static_cast<const AsmParser *>(Context);
2288 raw_ostream &OS = errs();
2289
2290 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
2291 SMLoc DiagLoc = Diag.getLoc();
2292 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
2293 unsigned CppHashBuf =
2294 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc);
2295
2296 // Like SourceMgr::printMessage() we need to print the include stack if any
2297 // before printing the message.
2298 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
2299 if (!Parser->SavedDiagHandler && DiagCurBuffer &&
2300 DiagCurBuffer != DiagSrcMgr.getMainFileID()) {
2301 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
2302 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
2303 }
2304
2305 // If we have not parsed a cpp hash line filename comment or the source
2306 // manager changed or buffer changed (like in a nested include) then just
2307 // print the normal diagnostic using its Filename and LineNo.
2308 if (!Parser->CppHashInfo.LineNumber || &DiagSrcMgr != &Parser->SrcMgr ||
2309 DiagBuf != CppHashBuf) {
2310 if (Parser->SavedDiagHandler)
2311 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
2312 else
2313 Diag.print(nullptr, OS);
2314 return;
2315 }
2316
2317 // Use the CppHashFilename and calculate a line number based on the
2318 // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc
2319 // for the diagnostic.
2320 const std::string &Filename = Parser->CppHashInfo.Filename;
2321
2322 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
2323 int CppHashLocLineNo =
2324 Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf);
2325 int LineNo =
2326 Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
2327
2328 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
2329 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
2330 Diag.getLineContents(), Diag.getRanges());
2331
2332 if (Parser->SavedDiagHandler)
2333 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
2334 else
2335 NewDiag.print(nullptr, OS);
2336}
2337
2338// FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
2339// difference being that that function accepts '@' as part of identifiers and
2340// we can't do that. AsmLexer.cpp should probably be changed to handle
2341// '@' as a special case when needed.
2342static bool isIdentifierChar(char c) {
2343 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
2344 c == '.';
2345}
2346
2347bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
2348 ArrayRef<MCAsmMacroParameter> Parameters,
2349 ArrayRef<MCAsmMacroArgument> A,
2350 bool EnableAtPseudoVariable, SMLoc L) {
2351 unsigned NParameters = Parameters.size();
2352 bool HasVararg = NParameters ? Parameters.back().Vararg : false;
2353 if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
2354 return Error(L, "Wrong number of arguments");
2355
2356 // A macro without parameters is handled differently on Darwin:
2357 // gas accepts no arguments and does no substitutions
2358 while (!Body.empty()) {
2359 // Scan for the next substitution.
2360 std::size_t End = Body.size(), Pos = 0;
2361 for (; Pos != End; ++Pos) {
2362 // Check for a substitution or escape.
2363 if (IsDarwin && !NParameters) {
2364 // This macro has no parameters, look for $0, $1, etc.
2365 if (Body[Pos] != '$' || Pos + 1 == End)
2366 continue;
2367
2368 char Next = Body[Pos + 1];
2369 if (Next == '$' || Next == 'n' ||
2370 isdigit(static_cast<unsigned char>(Next)))
2371 break;
2372 } else {
2373 // This macro has parameters, look for \foo, \bar, etc.
2374 if (Body[Pos] == '\\' && Pos + 1 != End)
2375 break;
2376 }
2377 }
2378
2379 // Add the prefix.
2380 OS << Body.slice(0, Pos);
2381
2382 // Check if we reached the end.
2383 if (Pos == End)
2384 break;
2385
2386 if (IsDarwin && !NParameters) {
2387 switch (Body[Pos + 1]) {
2388 // $$ => $
2389 case '$':
2390 OS << '$';
2391 break;
2392
2393 // $n => number of arguments
2394 case 'n':
2395 OS << A.size();
2396 break;
2397
2398 // $[0-9] => argument
2399 default: {
2400 // Missing arguments are ignored.
2401 unsigned Index = Body[Pos + 1] - '0';
2402 if (Index >= A.size())
2403 break;
2404
2405 // Otherwise substitute with the token values, with spaces eliminated.
2406 for (const AsmToken &Token : A[Index])
2407 OS << Token.getString();
2408 break;
2409 }
2410 }
2411 Pos += 2;
2412 } else {
2413 unsigned I = Pos + 1;
2414
2415 // Check for the \@ pseudo-variable.
2416 if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End)
2417 ++I;
2418 else
2419 while (isIdentifierChar(Body[I]) && I + 1 != End)
2420 ++I;
2421
2422 const char *Begin = Body.data() + Pos + 1;
2423 StringRef Argument(Begin, I - (Pos + 1));
2424 unsigned Index = 0;
2425
2426 if (Argument == "@") {
2427 OS << NumOfMacroInstantiations;
2428 Pos += 2;
2429 } else {
2430 for (; Index < NParameters; ++Index)
2431 if (Parameters[Index].Name == Argument)
2432 break;
2433
2434 if (Index == NParameters) {
2435 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
2436 Pos += 3;
2437 else {
2438 OS << '\\' << Argument;
2439 Pos = I;
2440 }
2441 } else {
2442 bool VarargParameter = HasVararg && Index == (NParameters - 1);
2443 for (const AsmToken &Token : A[Index])
2444 // For altmacro mode, you can write '%expr'.
2445 // The prefix '%' evaluates the expression 'expr'
2446 // and uses the result as a string (e.g. replace %(1+2) with the
2447 // string "3").
2448 // Here, we identify the integer token which is the result of the
2449 // absolute expression evaluation and replace it with its string
2450 // representation.
2451 if (AltMacroMode && Token.getString().front() == '%' &&
2452 Token.is(AsmToken::Integer))
2453 // Emit an integer value to the buffer.
2454 OS << Token.getIntVal();
2455 // Only Token that was validated as a string and begins with '<'
2456 // is considered altMacroString!!!
2457 else if (AltMacroMode && Token.getString().front() == '<' &&
2458 Token.is(AsmToken::String)) {
2459 OS << altMacroString(Token.getStringContents());
2460 }
2461 // We expect no quotes around the string's contents when
2462 // parsing for varargs.
2463 else if (Token.isNot(AsmToken::String) || VarargParameter)
2464 OS << Token.getString();
2465 else
2466 OS << Token.getStringContents();
2467
2468 Pos += 1 + Argument.size();
2469 }
2470 }
2471 }
2472 // Update the scan point.
2473 Body = Body.substr(Pos);
2474 }
2475
2476 return false;
2477}
2478
2479MacroInstantiation::MacroInstantiation(SMLoc IL, int EB, SMLoc EL,
2480 size_t CondStackDepth)
2481 : InstantiationLoc(IL), ExitBuffer(EB), ExitLoc(EL),
2482 CondStackDepth(CondStackDepth) {}
2483
2484static bool isOperator(AsmToken::TokenKind kind) {
2485 switch (kind) {
2486 default:
2487 return false;
2488 case AsmToken::Plus:
2489 case AsmToken::Minus:
2490 case AsmToken::Tilde:
2491 case AsmToken::Slash:
2492 case AsmToken::Star:
2493 case AsmToken::Dot:
2494 case AsmToken::Equal:
2495 case AsmToken::EqualEqual:
2496 case AsmToken::Pipe:
2497 case AsmToken::PipePipe:
2498 case AsmToken::Caret:
2499 case AsmToken::Amp:
2500 case AsmToken::AmpAmp:
2501 case AsmToken::Exclaim:
2502 case AsmToken::ExclaimEqual:
2503 case AsmToken::Less:
2504 case AsmToken::LessEqual:
2505 case AsmToken::LessLess:
2506 case AsmToken::LessGreater:
2507 case AsmToken::Greater:
2508 case AsmToken::GreaterEqual:
2509 case AsmToken::GreaterGreater:
2510 return true;
2511 }
2512}
2513
2514namespace {
2515
2516class AsmLexerSkipSpaceRAII {
2517public:
2518 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
2519 Lexer.setSkipSpace(SkipSpace);
2520 }
2521
2522 ~AsmLexerSkipSpaceRAII() {
2523 Lexer.setSkipSpace(true);
2524 }
2525
2526private:
2527 AsmLexer &Lexer;
2528};
2529
2530} // end anonymous namespace
2531
2532bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) {
2533
2534 if (Vararg) {
2535 if (Lexer.isNot(AsmToken::EndOfStatement)) {
2536 StringRef Str = parseStringToEndOfStatement();
2537 MA.emplace_back(AsmToken::String, Str);
2538 }
2539 return false;
2540 }
2541
2542 unsigned ParenLevel = 0;
2543
2544 // Darwin doesn't use spaces to delmit arguments.
2545 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
2546
2547 bool SpaceEaten;
2548
2549 while (true) {
2550 SpaceEaten = false;
2551 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
2552 return TokError("unexpected token in macro instantiation");
2553
2554 if (ParenLevel == 0) {
2555
2556 if (Lexer.is(AsmToken::Comma))
2557 break;
2558
2559 if (Lexer.is(AsmToken::Space)) {
2560 SpaceEaten = true;
2561 Lexer.Lex(); // Eat spaces
2562 }
2563
2564 // Spaces can delimit parameters, but could also be part an expression.
2565 // If the token after a space is an operator, add the token and the next
2566 // one into this argument
2567 if (!IsDarwin) {
2568 if (isOperator(Lexer.getKind())) {
2569 MA.push_back(getTok());
2570 Lexer.Lex();
2571
2572 // Whitespace after an operator can be ignored.
2573 if (Lexer.is(AsmToken::Space))
2574 Lexer.Lex();
2575
2576 continue;
2577 }
2578 }
2579 if (SpaceEaten)
2580 break;
2581 }
2582
2583 // handleMacroEntry relies on not advancing the lexer here
2584 // to be able to fill in the remaining default parameter values
2585 if (Lexer.is(AsmToken::EndOfStatement))
2586 break;
2587
2588 // Adjust the current parentheses level.
2589 if (Lexer.is(AsmToken::LParen))
2590 ++ParenLevel;
2591 else if (Lexer.is(AsmToken::RParen) && ParenLevel)
2592 --ParenLevel;
2593
2594 // Append the token to the current argument list.
2595 MA.push_back(getTok());
2596 Lexer.Lex();
2597 }
2598
2599 if (ParenLevel != 0)
2600 return TokError("unbalanced parentheses in macro argument");
2601 return false;
2602}
2603
2604// Parse the macro instantiation arguments.
2605bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
2606 MCAsmMacroArguments &A) {
2607 const unsigned NParameters = M ? M->Parameters.size() : 0;
2608 bool NamedParametersFound = false;
2609 SmallVector<SMLoc, 4> FALocs;
2610
2611 A.resize(NParameters);
2612 FALocs.resize(NParameters);
2613
2614 // Parse two kinds of macro invocations:
2615 // - macros defined without any parameters accept an arbitrary number of them
2616 // - macros defined with parameters accept at most that many of them
2617 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false;
2618 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
2619 ++Parameter) {
2620 SMLoc IDLoc = Lexer.getLoc();
2621 MCAsmMacroParameter FA;
2622
2623 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) {
2624 if (parseIdentifier(FA.Name))
2625 return Error(IDLoc, "invalid argument identifier for formal argument");
2626
2627 if (Lexer.isNot(AsmToken::Equal))
2628 return TokError("expected '=' after formal parameter identifier");
2629
2630 Lex();
2631
2632 NamedParametersFound = true;
2633 }
2634 bool Vararg = HasVararg && Parameter == (NParameters - 1);
2635
2636 if (NamedParametersFound && FA.Name.empty())
2637 return Error(IDLoc, "cannot mix positional and keyword arguments");
2638
2639 SMLoc StrLoc = Lexer.getLoc();
2640 SMLoc EndLoc;
2641 if (AltMacroMode && Lexer.is(AsmToken::Percent)) {
2642 const MCExpr *AbsoluteExp;
2643 int64_t Value;
2644 /// Eat '%'
2645 Lex();
2646 if (parseExpression(AbsoluteExp, EndLoc))
2647 return false;
2648 if (!AbsoluteExp->evaluateAsAbsolute(Value,
2649 getStreamer().getAssemblerPtr()))
2650 return Error(StrLoc, "expected absolute expression");
2651 const char *StrChar = StrLoc.getPointer();
2652 const char *EndChar = EndLoc.getPointer();
2653 AsmToken newToken(AsmToken::Integer,
2654 StringRef(StrChar, EndChar - StrChar), Value);
2655 FA.Value.push_back(newToken);
2656 } else if (AltMacroMode && Lexer.is(AsmToken::Less) &&
2657 isAltmacroString(StrLoc, EndLoc)) {
2658 const char *StrChar = StrLoc.getPointer();
2659 const char *EndChar = EndLoc.getPointer();
2660 jumpToLoc(EndLoc, CurBuffer);
2661 /// Eat from '<' to '>'
2662 Lex();
2663 AsmToken newToken(AsmToken::String,
2664 StringRef(StrChar, EndChar - StrChar));
2665 FA.Value.push_back(newToken);
2666 } else if(parseMacroArgument(FA.Value, Vararg))
2667 return true;
2668
2669 unsigned PI = Parameter;
2670 if (!FA.Name.empty()) {
2671 unsigned FAI = 0;
2672 for (FAI = 0; FAI < NParameters; ++FAI)
2673 if (M->Parameters[FAI].Name == FA.Name)
2674 break;
2675
2676 if (FAI >= NParameters) {
2677 assert(M && "expected macro to be defined")((M && "expected macro to be defined") ? static_cast<
void> (0) : __assert_fail ("M && \"expected macro to be defined\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 2677, __PRETTY_FUNCTION__))
;
2678 return Error(IDLoc, "parameter named '" + FA.Name +
2679 "' does not exist for macro '" + M->Name + "'");
2680 }
2681 PI = FAI;
2682 }
2683
2684 if (!FA.Value.empty()) {
2685 if (A.size() <= PI)
2686 A.resize(PI + 1);
2687 A[PI] = FA.Value;
2688
2689 if (FALocs.size() <= PI)
2690 FALocs.resize(PI + 1);
2691
2692 FALocs[PI] = Lexer.getLoc();
2693 }
2694
2695 // At the end of the statement, fill in remaining arguments that have
2696 // default values. If there aren't any, then the next argument is
2697 // required but missing
2698 if (Lexer.is(AsmToken::EndOfStatement)) {
2699 bool Failure = false;
2700 for (unsigned FAI = 0; FAI < NParameters; ++FAI) {
2701 if (A[FAI].empty()) {
2702 if (M->Parameters[FAI].Required) {
2703 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(),
2704 "missing value for required parameter "
2705 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'");
2706 Failure = true;
2707 }
2708
2709 if (!M->Parameters[FAI].Value.empty())
2710 A[FAI] = M->Parameters[FAI].Value;
2711 }
2712 }
2713 return Failure;
2714 }
2715
2716 if (Lexer.is(AsmToken::Comma))
2717 Lex();
2718 }
2719
2720 return TokError("too many positional arguments");
2721}
2722
2723bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
2724 // Arbitrarily limit macro nesting depth (default matches 'as'). We can
2725 // eliminate this, although we should protect against infinite loops.
2726 unsigned MaxNestingDepth = AsmMacroMaxNestingDepth;
2727 if (ActiveMacros.size() == MaxNestingDepth) {
2728 std::ostringstream MaxNestingDepthError;
2729 MaxNestingDepthError << "macros cannot be nested more than "
2730 << MaxNestingDepth << " levels deep."
2731 << " Use -asm-macro-max-nesting-depth to increase "
2732 "this limit.";
2733 return TokError(MaxNestingDepthError.str());
2734 }
2735
2736 MCAsmMacroArguments A;
2737 if (parseMacroArguments(M, A))
2738 return true;
2739
2740 // Macro instantiation is lexical, unfortunately. We construct a new buffer
2741 // to hold the macro body with substitutions.
2742 SmallString<256> Buf;
2743 StringRef Body = M->Body;
2744 raw_svector_ostream OS(Buf);
2745
2746 if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc()))
2747 return true;
2748
2749 // We include the .endmacro in the buffer as our cue to exit the macro
2750 // instantiation.
2751 OS << ".endmacro\n";
2752
2753 std::unique_ptr<MemoryBuffer> Instantiation =
2754 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2755
2756 // Create the macro instantiation object and add to the current macro
2757 // instantiation stack.
2758 MacroInstantiation *MI = new MacroInstantiation(
2759 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
2760 ActiveMacros.push_back(MI);
2761
2762 ++NumOfMacroInstantiations;
2763
2764 // Jump to the macro instantiation and prime the lexer.
2765 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
2766 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
2767 Lex();
2768
2769 return false;
2770}
2771
2772void AsmParser::handleMacroExit() {
2773 // Jump to the EndOfStatement we should return to, and consume it.
2774 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2775 Lex();
2776
2777 // Pop the instantiation entry.
2778 delete ActiveMacros.back();
2779 ActiveMacros.pop_back();
2780}
2781
2782bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
2783 bool NoDeadStrip) {
2784 MCSymbol *Sym;
2785 const MCExpr *Value;
2786 if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym,
2787 Value))
2788 return true;
2789
2790 if (!Sym) {
2791 // In the case where we parse an expression starting with a '.', we will
2792 // not generate an error, nor will we create a symbol. In this case we
2793 // should just return out.
2794 return false;
2795 }
2796
2797 // Do the assignment.
2798 Out.EmitAssignment(Sym, Value);
2799 if (NoDeadStrip)
2800 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2801
2802 return false;
2803}
2804
2805/// parseIdentifier:
2806/// ::= identifier
2807/// ::= string
2808bool AsmParser::parseIdentifier(StringRef &Res) {
2809 // The assembler has relaxed rules for accepting identifiers, in particular we
2810 // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2811 // separate tokens. At this level, we have already lexed so we cannot (currently)
2812 // handle this as a context dependent token, instead we detect adjacent tokens
2813 // and return the combined identifier.
2814 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2815 SMLoc PrefixLoc = getLexer().getLoc();
2816
2817 // Consume the prefix character, and check for a following identifier.
2818
2819 AsmToken Buf[1];
2820 Lexer.peekTokens(Buf, false);
2821
2822 if (Buf[0].isNot(AsmToken::Identifier))
2823 return true;
2824
2825 // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
2826 if (PrefixLoc.getPointer() + 1 != Buf[0].getLoc().getPointer())
2827 return true;
2828
2829 // eat $ or @
2830 Lexer.Lex(); // Lexer's Lex guarantees consecutive token.
2831 // Construct the joined identifier and consume the token.
2832 Res =
2833 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
2834 Lex(); // Parser Lex to maintain invariants.
2835 return false;
2836 }
2837
2838 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
2839 return true;
2840
2841 Res = getTok().getIdentifier();
2842
2843 Lex(); // Consume the identifier token.
2844
2845 return false;
2846}
2847
2848/// parseDirectiveSet:
2849/// ::= .equ identifier ',' expression
2850/// ::= .equiv identifier ',' expression
2851/// ::= .set identifier ',' expression
2852bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
2853 StringRef Name;
2854 if (check(parseIdentifier(Name), "expected identifier") ||
2855 parseToken(AsmToken::Comma) || parseAssignment(Name, allow_redef, true))
2856 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
2857 return false;
2858}
2859
2860bool AsmParser::parseEscapedString(std::string &Data) {
2861 if (check(getTok().isNot(AsmToken::String), "expected string"))
2862 return true;
2863
2864 Data = "";
2865 StringRef Str = getTok().getStringContents();
2866 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2867 if (Str[i] != '\\') {
2868 Data += Str[i];
2869 continue;
2870 }
2871
2872 // Recognize escaped characters. Note that this escape semantics currently
2873 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2874 ++i;
2875 if (i == e)
2876 return TokError("unexpected backslash at end of string");
2877
2878 // Recognize octal sequences.
2879 if ((unsigned)(Str[i] - '0') <= 7) {
2880 // Consume up to three octal characters.
2881 unsigned Value = Str[i] - '0';
2882
2883 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2884 ++i;
2885 Value = Value * 8 + (Str[i] - '0');
2886
2887 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2888 ++i;
2889 Value = Value * 8 + (Str[i] - '0');
2890 }
2891 }
2892
2893 if (Value > 255)
2894 return TokError("invalid octal escape sequence (out of range)");
2895
2896 Data += (unsigned char)Value;
2897 continue;
2898 }
2899
2900 // Otherwise recognize individual escapes.
2901 switch (Str[i]) {
2902 default:
2903 // Just reject invalid escape sequences for now.
2904 return TokError("invalid escape sequence (unrecognized character)");
2905
2906 case 'b': Data += '\b'; break;
2907 case 'f': Data += '\f'; break;
2908 case 'n': Data += '\n'; break;
2909 case 'r': Data += '\r'; break;
2910 case 't': Data += '\t'; break;
2911 case '"': Data += '"'; break;
2912 case '\\': Data += '\\'; break;
2913 }
2914 }
2915
2916 Lex();
2917 return false;
2918}
2919
2920/// parseDirectiveAscii:
2921/// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2922bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2923 auto parseOp = [&]() -> bool {
2924 std::string Data;
2925 if (checkForValidSection() || parseEscapedString(Data))
2926 return true;
2927 getStreamer().EmitBytes(Data);
2928 if (ZeroTerminated)
2929 getStreamer().EmitBytes(StringRef("\0", 1));
2930 return false;
2931 };
2932
2933 if (parseMany(parseOp))
2934 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
2935 return false;
2936}
2937
2938/// parseDirectiveReloc
2939/// ::= .reloc expression , identifier [ , expression ]
2940bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) {
2941 const MCExpr *Offset;
2942 const MCExpr *Expr = nullptr;
2943
2944 SMLoc OffsetLoc = Lexer.getTok().getLoc();
2945 int64_t OffsetValue;
2946 // We can only deal with constant expressions at the moment.
2947
2948 if (parseExpression(Offset))
2949 return true;
2950
2951 if (check(!Offset->evaluateAsAbsolute(OffsetValue,
2952 getStreamer().getAssemblerPtr()),
2953 OffsetLoc, "expression is not a constant value") ||
2954 check(OffsetValue < 0, OffsetLoc, "expression is negative") ||
2955 parseToken(AsmToken::Comma, "expected comma") ||
2956 check(getTok().isNot(AsmToken::Identifier), "expected relocation name"))
2957 return true;
2958
2959 SMLoc NameLoc = Lexer.getTok().getLoc();
2960 StringRef Name = Lexer.getTok().getIdentifier();
2961 Lex();
2962
2963 if (Lexer.is(AsmToken::Comma)) {
2964 Lex();
2965 SMLoc ExprLoc = Lexer.getLoc();
2966 if (parseExpression(Expr))
2967 return true;
2968
2969 MCValue Value;
2970 if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr))
2971 return Error(ExprLoc, "expression must be relocatable");
2972 }
2973
2974 if (parseToken(AsmToken::EndOfStatement,
2975 "unexpected token in .reloc directive"))
2976 return true;
2977
2978 const MCTargetAsmParser &MCT = getTargetParser();
2979 const MCSubtargetInfo &STI = MCT.getSTI();
2980 if (getStreamer().EmitRelocDirective(*Offset, Name, Expr, DirectiveLoc, STI))
2981 return Error(NameLoc, "unknown relocation name");
2982
2983 return false;
2984}
2985
2986/// parseDirectiveValue
2987/// ::= (.byte | .short | ... ) [ expression (, expression)* ]
2988bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) {
2989 auto parseOp = [&]() -> bool {
2990 const MCExpr *Value;
2991 SMLoc ExprLoc = getLexer().getLoc();
2992 if (checkForValidSection() || parseExpression(Value))
2993 return true;
2994 // Special case constant expressions to match code generator.
2995 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
2996 assert(Size <= 8 && "Invalid size")((Size <= 8 && "Invalid size") ? static_cast<void
> (0) : __assert_fail ("Size <= 8 && \"Invalid size\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 2996, __PRETTY_FUNCTION__))
;
2997 uint64_t IntValue = MCE->getValue();
2998 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
2999 return Error(ExprLoc, "out of range literal value");
3000 getStreamer().EmitIntValue(IntValue, Size);
3001 } else
3002 getStreamer().EmitValue(Value, Size, ExprLoc);
3003 return false;
3004 };
3005
3006 if (parseMany(parseOp))
3007 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
3008 return false;
3009}
3010
3011static bool parseHexOcta(AsmParser &Asm, uint64_t &hi, uint64_t &lo) {
3012 if (Asm.getTok().isNot(AsmToken::Integer) &&
3013 Asm.getTok().isNot(AsmToken::BigNum))
3014 return Asm.TokError("unknown token in expression");
3015 SMLoc ExprLoc = Asm.getTok().getLoc();
3016 APInt IntValue = Asm.getTok().getAPIntVal();
3017 Asm.Lex();
3018 if (!IntValue.isIntN(128))
3019 return Asm.Error(ExprLoc, "out of range literal value");
3020 if (!IntValue.isIntN(64)) {
3021 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue();
3022 lo = IntValue.getLoBits(64).getZExtValue();
3023 } else {
3024 hi = 0;
3025 lo = IntValue.getZExtValue();
3026 }
3027 return false;
3028}
3029
3030/// ParseDirectiveOctaValue
3031/// ::= .octa [ hexconstant (, hexconstant)* ]
3032
3033bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) {
3034 auto parseOp = [&]() -> bool {
3035 if (checkForValidSection())
3036 return true;
3037 uint64_t hi, lo;
3038 if (parseHexOcta(*this, hi, lo))
3039 return true;
3040 if (MAI.isLittleEndian()) {
3041 getStreamer().EmitIntValue(lo, 8);
3042 getStreamer().EmitIntValue(hi, 8);
3043 } else {
3044 getStreamer().EmitIntValue(hi, 8);
3045 getStreamer().EmitIntValue(lo, 8);
3046 }
3047 return false;
3048 };
3049
3050 if (parseMany(parseOp))
3051 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
3052 return false;
3053}
3054
3055bool AsmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) {
3056 // We don't truly support arithmetic on floating point expressions, so we
3057 // have to manually parse unary prefixes.
3058 bool IsNeg = false;
3059 if (getLexer().is(AsmToken::Minus)) {
3060 Lexer.Lex();
3061 IsNeg = true;
3062 } else if (getLexer().is(AsmToken::Plus))
3063 Lexer.Lex();
3064
3065 if (Lexer.is(AsmToken::Error))
3066 return TokError(Lexer.getErr());
3067 if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) &&
3068 Lexer.isNot(AsmToken::Identifier))
3069 return TokError("unexpected token in directive");
3070
3071 // Convert to an APFloat.
3072 APFloat Value(Semantics);
3073 StringRef IDVal = getTok().getString();
3074 if (getLexer().is(AsmToken::Identifier)) {
3075 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
3076 Value = APFloat::getInf(Semantics);
3077 else if (!IDVal.compare_lower("nan"))
3078 Value = APFloat::getNaN(Semantics, false, ~0);
3079 else
3080 return TokError("invalid floating point literal");
3081 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
3082 APFloat::opInvalidOp)
3083 return TokError("invalid floating point literal");
3084 if (IsNeg)
3085 Value.changeSign();
3086
3087 // Consume the numeric token.
3088 Lex();
3089
3090 Res = Value.bitcastToAPInt();
3091
3092 return false;
3093}
3094
3095/// parseDirectiveRealValue
3096/// ::= (.single | .double) [ expression (, expression)* ]
3097bool AsmParser::parseDirectiveRealValue(StringRef IDVal,
3098 const fltSemantics &Semantics) {
3099 auto parseOp = [&]() -> bool {
3100 APInt AsInt;
3101 if (checkForValidSection() || parseRealValue(Semantics, AsInt))
3102 return true;
3103 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
3104 AsInt.getBitWidth() / 8);
3105 return false;
3106 };
3107
3108 if (parseMany(parseOp))
3109 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
3110 return false;
3111}
3112
3113/// parseDirectiveZero
3114/// ::= .zero expression
3115bool AsmParser::parseDirectiveZero() {
3116 SMLoc NumBytesLoc = Lexer.getLoc();
3117 const MCExpr *NumBytes;
3118 if (checkForValidSection() || parseExpression(NumBytes))
3119 return true;
3120
3121 int64_t Val = 0;
3122 if (getLexer().is(AsmToken::Comma)) {
3123 Lex();
3124 if (parseAbsoluteExpression(Val))
3125 return true;
3126 }
3127
3128 if (parseToken(AsmToken::EndOfStatement,
3129 "unexpected token in '.zero' directive"))
3130 return true;
3131 getStreamer().emitFill(*NumBytes, Val, NumBytesLoc);
3132
3133 return false;
3134}
3135
3136/// parseDirectiveFill
3137/// ::= .fill expression [ , expression [ , expression ] ]
3138bool AsmParser::parseDirectiveFill() {
3139 SMLoc NumValuesLoc = Lexer.getLoc();
3140 const MCExpr *NumValues;
3141 if (checkForValidSection() || parseExpression(NumValues))
3142 return true;
3143
3144 int64_t FillSize = 1;
3145 int64_t FillExpr = 0;
3146
3147 SMLoc SizeLoc, ExprLoc;
3148
3149 if (parseOptionalToken(AsmToken::Comma)) {
3150 SizeLoc = getTok().getLoc();
3151 if (parseAbsoluteExpression(FillSize))
3152 return true;
3153 if (parseOptionalToken(AsmToken::Comma)) {
3154 ExprLoc = getTok().getLoc();
3155 if (parseAbsoluteExpression(FillExpr))
3156 return true;
3157 }
3158 }
3159 if (parseToken(AsmToken::EndOfStatement,
3160 "unexpected token in '.fill' directive"))
3161 return true;
3162
3163 if (FillSize < 0) {
3164 Warning(SizeLoc, "'.fill' directive with negative size has no effect");
3165 return false;
3166 }
3167 if (FillSize > 8) {
3168 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
3169 FillSize = 8;
3170 }
3171
3172 if (!isUInt<32>(FillExpr) && FillSize > 4)
3173 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");
3174
3175 getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc);
3176
3177 return false;
3178}
3179
3180/// parseDirectiveOrg
3181/// ::= .org expression [ , expression ]
3182bool AsmParser::parseDirectiveOrg() {
3183 const MCExpr *Offset;
3184 SMLoc OffsetLoc = Lexer.getLoc();
3185 if (checkForValidSection() || parseExpression(Offset))
3186 return true;
3187
3188 // Parse optional fill expression.
3189 int64_t FillExpr = 0;
3190 if (parseOptionalToken(AsmToken::Comma))
3191 if (parseAbsoluteExpression(FillExpr))
3192 return addErrorSuffix(" in '.org' directive");
3193 if (parseToken(AsmToken::EndOfStatement))
3194 return addErrorSuffix(" in '.org' directive");
3195
3196 getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc);
3197 return false;
3198}
3199
3200/// parseDirectiveAlign
3201/// ::= {.align, ...} expression [ , expression [ , expression ]]
3202bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
3203 SMLoc AlignmentLoc = getLexer().getLoc();
3204 int64_t Alignment;
3205 SMLoc MaxBytesLoc;
3206 bool HasFillExpr = false;
3207 int64_t FillExpr = 0;
3208 int64_t MaxBytesToFill = 0;
3209
3210 auto parseAlign = [&]() -> bool {
3211 if (parseAbsoluteExpression(Alignment))
3212 return true;
3213 if (parseOptionalToken(AsmToken::Comma)) {
3214 // The fill expression can be omitted while specifying a maximum number of
3215 // alignment bytes, e.g:
3216 // .align 3,,4
3217 if (getTok().isNot(AsmToken::Comma)) {
3218 HasFillExpr = true;
3219 if (parseAbsoluteExpression(FillExpr))
3220 return true;
3221 }
3222 if (parseOptionalToken(AsmToken::Comma))
3223 if (parseTokenLoc(MaxBytesLoc) ||
3224 parseAbsoluteExpression(MaxBytesToFill))
3225 return true;
3226 }
3227 return parseToken(AsmToken::EndOfStatement);
3228 };
3229
3230 if (checkForValidSection())
3231 return addErrorSuffix(" in directive");
3232 // Ignore empty '.p2align' directives for GNU-as compatibility
3233 if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) {
3234 Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored");
3235 return parseToken(AsmToken::EndOfStatement);
3236 }
3237 if (parseAlign())
3238 return addErrorSuffix(" in directive");
3239
3240 // Always emit an alignment here even if we thrown an error.
3241 bool ReturnVal = false;
3242
3243 // Compute alignment in bytes.
3244 if (IsPow2) {
3245 // FIXME: Diagnose overflow.
3246 if (Alignment >= 32) {
3247 ReturnVal |= Error(AlignmentLoc, "invalid alignment value");
3248 Alignment = 31;
3249 }
3250
3251 Alignment = 1ULL << Alignment;
3252 } else {
3253 // Reject alignments that aren't either a power of two or zero,
3254 // for gas compatibility. Alignment of zero is silently rounded
3255 // up to one.
3256 if (Alignment == 0)
3257 Alignment = 1;
3258 if (!isPowerOf2_64(Alignment))
3259 ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2");
3260 }
3261
3262 // Diagnose non-sensical max bytes to align.
3263 if (MaxBytesLoc.isValid()) {
3264 if (MaxBytesToFill < 1) {
3265 ReturnVal |= Error(MaxBytesLoc,
3266 "alignment directive can never be satisfied in this "
3267 "many bytes, ignoring maximum bytes expression");
3268 MaxBytesToFill = 0;
3269 }
3270
3271 if (MaxBytesToFill >= Alignment) {
3272 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
3273 "has no effect");
3274 MaxBytesToFill = 0;
3275 }
3276 }
3277
3278 // Check whether we should use optimal code alignment for this .align
3279 // directive.
3280 const MCSection *Section = getStreamer().getCurrentSectionOnly();
3281 assert(Section && "must have section to emit alignment")((Section && "must have section to emit alignment") ?
static_cast<void> (0) : __assert_fail ("Section && \"must have section to emit alignment\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 3281, __PRETTY_FUNCTION__))
;
3282 bool UseCodeAlign = Section->UseCodeAlign();
3283 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
3284 ValueSize == 1 && UseCodeAlign) {
3285 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
3286 } else {
3287 // FIXME: Target specific behavior about how the "extra" bytes are filled.
3288 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
3289 MaxBytesToFill);
3290 }
3291
3292 return ReturnVal;
3293}
3294
3295/// parseDirectiveFile
3296/// ::= .file filename
3297/// ::= .file number [directory] filename [md5 checksum] [source source-text]
3298bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
3299 // FIXME: I'm not sure what this is.
3300 int64_t FileNumber = -1;
3301 if (getLexer().is(AsmToken::Integer)) {
3302 FileNumber = getTok().getIntVal();
3303 Lex();
3304
3305 if (FileNumber < 0)
3306 return TokError("negative file number");
3307 }
3308
3309 std::string Path;
3310
3311 // Usually the directory and filename together, otherwise just the directory.
3312 // Allow the strings to have escaped octal character sequence.
3313 if (check(getTok().isNot(AsmToken::String),
3314 "unexpected token in '.file' directive") ||
3315 parseEscapedString(Path))
3316 return true;
3317
3318 StringRef Directory;
3319 StringRef Filename;
3320 std::string FilenameData;
3321 if (getLexer().is(AsmToken::String)) {
3322 if (check(FileNumber == -1,
3323 "explicit path specified, but no file number") ||
3324 parseEscapedString(FilenameData))
3325 return true;
3326 Filename = FilenameData;
3327 Directory = Path;
3328 } else {
3329 Filename = Path;
3330 }
3331
3332 uint64_t MD5Hi, MD5Lo;
3333 bool HasMD5 = false;
3334
3335 Optional<StringRef> Source;
3336 bool HasSource = false;
3337 std::string SourceString;
3338
3339 while (!parseOptionalToken(AsmToken::EndOfStatement)) {
3340 StringRef Keyword;
3341 if (check(getTok().isNot(AsmToken::Identifier),
3342 "unexpected token in '.file' directive") ||
3343 parseIdentifier(Keyword))
3344 return true;
3345 if (Keyword == "md5") {
3346 HasMD5 = true;
3347 if (check(FileNumber == -1,
3348 "MD5 checksum specified, but no file number") ||
3349 parseHexOcta(*this, MD5Hi, MD5Lo))
3350 return true;
3351 } else if (Keyword == "source") {
3352 HasSource = true;
3353 if (check(FileNumber == -1,
3354 "source specified, but no file number") ||
3355 check(getTok().isNot(AsmToken::String),
3356 "unexpected token in '.file' directive") ||
3357 parseEscapedString(SourceString))
3358 return true;
3359 } else {
3360 return TokError("unexpected token in '.file' directive");
3361 }
3362 }
3363
3364 if (FileNumber == -1)
3365 getStreamer().EmitFileDirective(Filename);
3366 else {
3367 // In case there is a -g option as well as debug info from directive .file,
3368 // we turn off the -g option, directly use the existing debug info instead.
3369 // Also reset any implicit ".file 0" for the assembler source.
3370 if (Ctx.getGenDwarfForAssembly()) {
3371 Ctx.getMCDwarfLineTable(0).resetRootFile();
3372 Ctx.setGenDwarfForAssembly(false);
3373 }
3374
3375 MD5::MD5Result *CKMem = nullptr;
3376 if (HasMD5) {
3377 CKMem = (MD5::MD5Result *)Ctx.allocate(sizeof(MD5::MD5Result), 1);
3378 for (unsigned i = 0; i != 8; ++i) {
3379 CKMem->Bytes[i] = uint8_t(MD5Hi >> ((7 - i) * 8));
3380 CKMem->Bytes[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8));
3381 }
3382 }
3383 if (HasSource) {
3384 char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size()));
3385 memcpy(SourceBuf, SourceString.data(), SourceString.size());
3386 Source = StringRef(SourceBuf, SourceString.size());
3387 }
3388 if (FileNumber == 0) {
3389 if (Ctx.getDwarfVersion() < 5)
3390 return Warning(DirectiveLoc, "file 0 not supported prior to DWARF-5");
3391 getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source);
3392 } else {
3393 Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective(
3394 FileNumber, Directory, Filename, CKMem, Source);
3395 if (!FileNumOrErr)
3396 return Error(DirectiveLoc, toString(FileNumOrErr.takeError()));
3397 FileNumber = FileNumOrErr.get();
Value stored to 'FileNumber' is never read
3398 }
3399 // Alert the user if there are some .file directives with MD5 and some not.
3400 // But only do that once.
3401 if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) {
3402 ReportedInconsistentMD5 = true;
3403 return Warning(DirectiveLoc, "inconsistent use of MD5 checksums");
3404 }
3405 }
3406
3407 return false;
3408}
3409
3410/// parseDirectiveLine
3411/// ::= .line [number]
3412bool AsmParser::parseDirectiveLine() {
3413 int64_t LineNumber;
3414 if (getLexer().is(AsmToken::Integer)) {
3415 if (parseIntToken(LineNumber, "unexpected token in '.line' directive"))
3416 return true;
3417 (void)LineNumber;
3418 // FIXME: Do something with the .line.
3419 }
3420 if (parseToken(AsmToken::EndOfStatement,
3421 "unexpected token in '.line' directive"))
3422 return true;
3423
3424 return false;
3425}
3426
3427/// parseDirectiveLoc
3428/// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
3429/// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
3430/// The first number is a file number, must have been previously assigned with
3431/// a .file directive, the second number is the line number and optionally the
3432/// third number is a column position (zero if not specified). The remaining
3433/// optional items are .loc sub-directives.
3434bool AsmParser::parseDirectiveLoc() {
3435 int64_t FileNumber = 0, LineNumber = 0;
3436 SMLoc Loc = getTok().getLoc();
3437 if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") ||
3438 check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc,
3439 "file number less than one in '.loc' directive") ||
3440 check(!getContext().isValidDwarfFileNumber(FileNumber), Loc,
3441 "unassigned file number in '.loc' directive"))
3442 return true;
3443
3444 // optional
3445 if (getLexer().is(AsmToken::Integer)) {
3446 LineNumber = getTok().getIntVal();
3447 if (LineNumber < 0)
3448 return TokError("line number less than zero in '.loc' directive");
3449 Lex();
3450 }
3451
3452 int64_t ColumnPos = 0;
3453 if (getLexer().is(AsmToken::Integer)) {
3454 ColumnPos = getTok().getIntVal();
3455 if (ColumnPos < 0)
3456 return TokError("column position less than zero in '.loc' directive");
3457 Lex();
3458 }
3459
3460 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT1 ? DWARF2_FLAG_IS_STMT(1 << 0) : 0;
3461 unsigned Isa = 0;
3462 int64_t Discriminator = 0;
3463
3464 auto parseLocOp = [&]() -> bool {
3465 StringRef Name;
3466 SMLoc Loc = getTok().getLoc();
3467 if (parseIdentifier(Name))
3468 return TokError("unexpected token in '.loc' directive");
3469
3470 if (Name == "basic_block")
3471 Flags |= DWARF2_FLAG_BASIC_BLOCK(1 << 1);
3472 else if (Name == "prologue_end")
3473 Flags |= DWARF2_FLAG_PROLOGUE_END(1 << 2);
3474 else if (Name == "epilogue_begin")
3475 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN(1 << 3);
3476 else if (Name == "is_stmt") {
3477 Loc = getTok().getLoc();
3478 const MCExpr *Value;
3479 if (parseExpression(Value))
3480 return true;
3481 // The expression must be the constant 0 or 1.
3482 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3483 int Value = MCE->getValue();
3484 if (Value == 0)
3485 Flags &= ~DWARF2_FLAG_IS_STMT(1 << 0);
3486 else if (Value == 1)
3487 Flags |= DWARF2_FLAG_IS_STMT(1 << 0);
3488 else
3489 return Error(Loc, "is_stmt value not 0 or 1");
3490 } else {
3491 return Error(Loc, "is_stmt value not the constant value of 0 or 1");
3492 }
3493 } else if (Name == "isa") {
3494 Loc = getTok().getLoc();
3495 const MCExpr *Value;
3496 if (parseExpression(Value))
3497 return true;
3498 // The expression must be a constant greater or equal to 0.
3499 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3500 int Value = MCE->getValue();
3501 if (Value < 0)
3502 return Error(Loc, "isa number less than zero");
3503 Isa = Value;
3504 } else {
3505 return Error(Loc, "isa number not a constant value");
3506 }
3507 } else if (Name == "discriminator") {
3508 if (parseAbsoluteExpression(Discriminator))
3509 return true;
3510 } else {
3511 return Error(Loc, "unknown sub-directive in '.loc' directive");
3512 }
3513 return false;
3514 };
3515
3516 if (parseMany(parseLocOp, false /*hasComma*/))
3517 return true;
3518
3519 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
3520 Isa, Discriminator, StringRef());
3521
3522 return false;
3523}
3524
3525/// parseDirectiveStabs
3526/// ::= .stabs string, number, number, number
3527bool AsmParser::parseDirectiveStabs() {
3528 return TokError("unsupported directive '.stabs'");
3529}
3530
3531/// parseDirectiveCVFile
3532/// ::= .cv_file number filename [checksum] [checksumkind]
3533bool AsmParser::parseDirectiveCVFile() {
3534 SMLoc FileNumberLoc = getTok().getLoc();
3535 int64_t FileNumber;
3536 std::string Filename;
3537 std::string Checksum;
3538 int64_t ChecksumKind = 0;
3539
3540 if (parseIntToken(FileNumber,
3541 "expected file number in '.cv_file' directive") ||
3542 check(FileNumber < 1, FileNumberLoc, "file number less than one") ||
3543 check(getTok().isNot(AsmToken::String),
3544 "unexpected token in '.cv_file' directive") ||
3545 parseEscapedString(Filename))
3546 return true;
3547 if (!parseOptionalToken(AsmToken::EndOfStatement)) {
3548 if (check(getTok().isNot(AsmToken::String),
3549 "unexpected token in '.cv_file' directive") ||
3550 parseEscapedString(Checksum) ||
3551 parseIntToken(ChecksumKind,
3552 "expected checksum kind in '.cv_file' directive") ||
3553 parseToken(AsmToken::EndOfStatement,
3554 "unexpected token in '.cv_file' directive"))
3555 return true;
3556 }
3557
3558 Checksum = fromHex(Checksum);
3559 void *CKMem = Ctx.allocate(Checksum.size(), 1);
3560 memcpy(CKMem, Checksum.data(), Checksum.size());
3561 ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem),
3562 Checksum.size());
3563
3564 if (!getStreamer().EmitCVFileDirective(FileNumber, Filename, ChecksumAsBytes,
3565 static_cast<uint8_t>(ChecksumKind)))
3566 return Error(FileNumberLoc, "file number already allocated");
3567
3568 return false;
3569}
3570
3571bool AsmParser::parseCVFunctionId(int64_t &FunctionId,
3572 StringRef DirectiveName) {
3573 SMLoc Loc;
3574 return parseTokenLoc(Loc) ||
3575 parseIntToken(FunctionId, "expected function id in '" + DirectiveName +
3576 "' directive") ||
3577 check(FunctionId < 0 || FunctionId >= UINT_MAX(2147483647 *2U +1U), Loc,
3578 "expected function id within range [0, UINT_MAX)");
3579}
3580
3581bool AsmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) {
3582 SMLoc Loc;
3583 return parseTokenLoc(Loc) ||
3584 parseIntToken(FileNumber, "expected integer in '" + DirectiveName +
3585 "' directive") ||
3586 check(FileNumber < 1, Loc, "file number less than one in '" +
3587 DirectiveName + "' directive") ||
3588 check(!getCVContext().isValidFileNumber(FileNumber), Loc,
3589 "unassigned file number in '" + DirectiveName + "' directive");
3590}
3591
3592/// parseDirectiveCVFuncId
3593/// ::= .cv_func_id FunctionId
3594///
3595/// Introduces a function ID that can be used with .cv_loc.
3596bool AsmParser::parseDirectiveCVFuncId() {
3597 SMLoc FunctionIdLoc = getTok().getLoc();
3598 int64_t FunctionId;
3599
3600 if (parseCVFunctionId(FunctionId, ".cv_func_id") ||
3601 parseToken(AsmToken::EndOfStatement,
3602 "unexpected token in '.cv_func_id' directive"))
3603 return true;
3604
3605 if (!getStreamer().EmitCVFuncIdDirective(FunctionId))
3606 return Error(FunctionIdLoc, "function id already allocated");
3607
3608 return false;
3609}
3610
3611/// parseDirectiveCVInlineSiteId
3612/// ::= .cv_inline_site_id FunctionId
3613/// "within" IAFunc
3614/// "inlined_at" IAFile IALine [IACol]
3615///
3616/// Introduces a function ID that can be used with .cv_loc. Includes "inlined
3617/// at" source location information for use in the line table of the caller,
3618/// whether the caller is a real function or another inlined call site.
3619bool AsmParser::parseDirectiveCVInlineSiteId() {
3620 SMLoc FunctionIdLoc = getTok().getLoc();
3621 int64_t FunctionId;
3622 int64_t IAFunc;
3623 int64_t IAFile;
3624 int64_t IALine;
3625 int64_t IACol = 0;
3626
3627 // FunctionId
3628 if (parseCVFunctionId(FunctionId, ".cv_inline_site_id"))
3629 return true;
3630
3631 // "within"
3632 if (check((getLexer().isNot(AsmToken::Identifier) ||
3633 getTok().getIdentifier() != "within"),
3634 "expected 'within' identifier in '.cv_inline_site_id' directive"))
3635 return true;
3636 Lex();
3637
3638 // IAFunc
3639 if (parseCVFunctionId(IAFunc, ".cv_inline_site_id"))
3640 return true;
3641
3642 // "inlined_at"
3643 if (check((getLexer().isNot(AsmToken::Identifier) ||
3644 getTok().getIdentifier() != "inlined_at"),
3645 "expected 'inlined_at' identifier in '.cv_inline_site_id' "
3646 "directive") )
3647 return true;
3648 Lex();
3649
3650 // IAFile IALine
3651 if (parseCVFileId(IAFile, ".cv_inline_site_id") ||
3652 parseIntToken(IALine, "expected line number after 'inlined_at'"))
3653 return true;
3654
3655 // [IACol]
3656 if (getLexer().is(AsmToken::Integer)) {
3657 IACol = getTok().getIntVal();
3658 Lex();
3659 }
3660
3661 if (parseToken(AsmToken::EndOfStatement,
3662 "unexpected token in '.cv_inline_site_id' directive"))
3663 return true;
3664
3665 if (!getStreamer().EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
3666 IALine, IACol, FunctionIdLoc))
3667 return Error(FunctionIdLoc, "function id already allocated");
3668
3669 return false;
3670}
3671
3672/// parseDirectiveCVLoc
3673/// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end]
3674/// [is_stmt VALUE]
3675/// The first number is a file number, must have been previously assigned with
3676/// a .file directive, the second number is the line number and optionally the
3677/// third number is a column position (zero if not specified). The remaining
3678/// optional items are .loc sub-directives.
3679bool AsmParser::parseDirectiveCVLoc() {
3680 SMLoc DirectiveLoc = getTok().getLoc();
3681 int64_t FunctionId, FileNumber;
3682 if (parseCVFunctionId(FunctionId, ".cv_loc") ||
3683 parseCVFileId(FileNumber, ".cv_loc"))
3684 return true;
3685
3686 int64_t LineNumber = 0;
3687 if (getLexer().is(AsmToken::Integer)) {
3688 LineNumber = getTok().getIntVal();
3689 if (LineNumber < 0)
3690 return TokError("line number less than zero in '.cv_loc' directive");
3691 Lex();
3692 }
3693
3694 int64_t ColumnPos = 0;
3695 if (getLexer().is(AsmToken::Integer)) {
3696 ColumnPos = getTok().getIntVal();
3697 if (ColumnPos < 0)
3698 return TokError("column position less than zero in '.cv_loc' directive");
3699 Lex();
3700 }
3701
3702 bool PrologueEnd = false;
3703 uint64_t IsStmt = 0;
3704
3705 auto parseOp = [&]() -> bool {
3706 StringRef Name;
3707 SMLoc Loc = getTok().getLoc();
3708 if (parseIdentifier(Name))
3709 return TokError("unexpected token in '.cv_loc' directive");
3710 if (Name == "prologue_end")
3711 PrologueEnd = true;
3712 else if (Name == "is_stmt") {
3713 Loc = getTok().getLoc();
3714 const MCExpr *Value;
3715 if (parseExpression(Value))
3716 return true;
3717 // The expression must be the constant 0 or 1.
3718 IsStmt = ~0ULL;
3719 if (const auto *MCE = dyn_cast<MCConstantExpr>(Value))
3720 IsStmt = MCE->getValue();
3721
3722 if (IsStmt > 1)
3723 return Error(Loc, "is_stmt value not 0 or 1");
3724 } else {
3725 return Error(Loc, "unknown sub-directive in '.cv_loc' directive");
3726 }
3727 return false;
3728 };
3729
3730 if (parseMany(parseOp, false /*hasComma*/))
3731 return true;
3732
3733 getStreamer().EmitCVLocDirective(FunctionId, FileNumber, LineNumber,
3734 ColumnPos, PrologueEnd, IsStmt, StringRef(),
3735 DirectiveLoc);
3736 return false;
3737}
3738
3739/// parseDirectiveCVLinetable
3740/// ::= .cv_linetable FunctionId, FnStart, FnEnd
3741bool AsmParser::parseDirectiveCVLinetable() {
3742 int64_t FunctionId;
3743 StringRef FnStartName, FnEndName;
3744 SMLoc Loc = getTok().getLoc();
3745 if (parseCVFunctionId(FunctionId, ".cv_linetable") ||
3746 parseToken(AsmToken::Comma,
3747 "unexpected token in '.cv_linetable' directive") ||
3748 parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
3749 "expected identifier in directive") ||
3750 parseToken(AsmToken::Comma,
3751 "unexpected token in '.cv_linetable' directive") ||
3752 parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
3753 "expected identifier in directive"))
3754 return true;
3755
3756 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
3757 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
3758
3759 getStreamer().EmitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym);
3760 return false;
3761}
3762
3763/// parseDirectiveCVInlineLinetable
3764/// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd
3765bool AsmParser::parseDirectiveCVInlineLinetable() {
3766 int64_t PrimaryFunctionId, SourceFileId, SourceLineNum;
3767 StringRef FnStartName, FnEndName;
3768 SMLoc Loc = getTok().getLoc();
3769 if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") ||
3770 parseTokenLoc(Loc) ||
3771 parseIntToken(
3772 SourceFileId,
3773 "expected SourceField in '.cv_inline_linetable' directive") ||
3774 check(SourceFileId <= 0, Loc,
3775 "File id less than zero in '.cv_inline_linetable' directive") ||
3776 parseTokenLoc(Loc) ||
3777 parseIntToken(
3778 SourceLineNum,
3779 "expected SourceLineNum in '.cv_inline_linetable' directive") ||
3780 check(SourceLineNum < 0, Loc,
3781 "Line number less than zero in '.cv_inline_linetable' directive") ||
3782 parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
3783 "expected identifier in directive") ||
3784 parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
3785 "expected identifier in directive"))
3786 return true;
3787
3788 if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
3789 return true;
3790
3791 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
3792 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
3793 getStreamer().EmitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId,
3794 SourceLineNum, FnStartSym,
3795 FnEndSym);
3796 return false;
3797}
3798
3799/// parseDirectiveCVDefRange
3800/// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes*
3801bool AsmParser::parseDirectiveCVDefRange() {
3802 SMLoc Loc;
3803 std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges;
3804 while (getLexer().is(AsmToken::Identifier)) {
3805 Loc = getLexer().getLoc();
3806 StringRef GapStartName;
3807 if (parseIdentifier(GapStartName))
3808 return Error(Loc, "expected identifier in directive");
3809 MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName);
3810
3811 Loc = getLexer().getLoc();
3812 StringRef GapEndName;
3813 if (parseIdentifier(GapEndName))
3814 return Error(Loc, "expected identifier in directive");
3815 MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName);
3816
3817 Ranges.push_back({GapStartSym, GapEndSym});
3818 }
3819
3820 std::string FixedSizePortion;
3821 if (parseToken(AsmToken::Comma, "unexpected token in directive") ||
3822 parseEscapedString(FixedSizePortion))
3823 return true;
3824
3825 getStreamer().EmitCVDefRangeDirective(Ranges, FixedSizePortion);
3826 return false;
3827}
3828
3829/// parseDirectiveCVString
3830/// ::= .cv_stringtable "string"
3831bool AsmParser::parseDirectiveCVString() {
3832 std::string Data;
3833 if (checkForValidSection() || parseEscapedString(Data))
3834 return addErrorSuffix(" in '.cv_string' directive");
3835
3836 // Put the string in the table and emit the offset.
3837 std::pair<StringRef, unsigned> Insertion =
3838 getCVContext().addToStringTable(Data);
3839 getStreamer().EmitIntValue(Insertion.second, 4);
3840 return false;
3841}
3842
3843/// parseDirectiveCVStringTable
3844/// ::= .cv_stringtable
3845bool AsmParser::parseDirectiveCVStringTable() {
3846 getStreamer().EmitCVStringTableDirective();
3847 return false;
3848}
3849
3850/// parseDirectiveCVFileChecksums
3851/// ::= .cv_filechecksums
3852bool AsmParser::parseDirectiveCVFileChecksums() {
3853 getStreamer().EmitCVFileChecksumsDirective();
3854 return false;
3855}
3856
3857/// parseDirectiveCVFileChecksumOffset
3858/// ::= .cv_filechecksumoffset fileno
3859bool AsmParser::parseDirectiveCVFileChecksumOffset() {
3860 int64_t FileNo;
3861 if (parseIntToken(FileNo, "expected identifier in directive"))
3862 return true;
3863 if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
3864 return true;
3865 getStreamer().EmitCVFileChecksumOffsetDirective(FileNo);
3866 return false;
3867}
3868
3869/// parseDirectiveCVFPOData
3870/// ::= .cv_fpo_data procsym
3871bool AsmParser::parseDirectiveCVFPOData() {
3872 SMLoc DirLoc = getLexer().getLoc();
3873 StringRef ProcName;
3874 if (parseIdentifier(ProcName))
3875 return TokError("expected symbol name");
3876 if (parseEOL("unexpected tokens"))
3877 return addErrorSuffix(" in '.cv_fpo_data' directive");
3878 MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName);
3879 getStreamer().EmitCVFPOData(ProcSym, DirLoc);
3880 return false;
3881}
3882
3883/// parseDirectiveCFISections
3884/// ::= .cfi_sections section [, section]
3885bool AsmParser::parseDirectiveCFISections() {
3886 StringRef Name;
3887 bool EH = false;
3888 bool Debug = false;
3889
3890 if (parseIdentifier(Name))
3891 return TokError("Expected an identifier");
3892
3893 if (Name == ".eh_frame")
3894 EH = true;
3895 else if (Name == ".debug_frame")
3896 Debug = true;
3897
3898 if (getLexer().is(AsmToken::Comma)) {
3899 Lex();
3900
3901 if (parseIdentifier(Name))
3902 return TokError("Expected an identifier");
3903
3904 if (Name == ".eh_frame")
3905 EH = true;
3906 else if (Name == ".debug_frame")
3907 Debug = true;
3908 }
3909
3910 getStreamer().EmitCFISections(EH, Debug);
3911 return false;
3912}
3913
3914/// parseDirectiveCFIStartProc
3915/// ::= .cfi_startproc [simple]
3916bool AsmParser::parseDirectiveCFIStartProc() {
3917 StringRef Simple;
3918 if (!parseOptionalToken(AsmToken::EndOfStatement)) {
3919 if (check(parseIdentifier(Simple) || Simple != "simple",
3920 "unexpected token") ||
3921 parseToken(AsmToken::EndOfStatement))
3922 return addErrorSuffix(" in '.cfi_startproc' directive");
3923 }
3924
3925 // TODO(kristina): Deal with a corner case of incorrect diagnostic context
3926 // being produced if this directive is emitted as part of preprocessor macro
3927 // expansion which can *ONLY* happen if Clang's cc1as is the API consumer.
3928 // Tools like llvm-mc on the other hand are not affected by it, and report
3929 // correct context information.
3930 getStreamer().EmitCFIStartProc(!Simple.empty(), Lexer.getLoc());
3931 return false;
3932}
3933
3934/// parseDirectiveCFIEndProc
3935/// ::= .cfi_endproc
3936bool AsmParser::parseDirectiveCFIEndProc() {
3937 getStreamer().EmitCFIEndProc();
3938 return false;
3939}
3940
3941/// parse register name or number.
3942bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
3943 SMLoc DirectiveLoc) {
3944 unsigned RegNo;
3945
3946 if (getLexer().isNot(AsmToken::Integer)) {
3947 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
3948 return true;
3949 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
3950 } else
3951 return parseAbsoluteExpression(Register);
3952
3953 return false;
3954}
3955
3956/// parseDirectiveCFIDefCfa
3957/// ::= .cfi_def_cfa register, offset
3958bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
3959 int64_t Register = 0, Offset = 0;
3960 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) ||
3961 parseToken(AsmToken::Comma, "unexpected token in directive") ||
3962 parseAbsoluteExpression(Offset))
3963 return true;
3964
3965 getStreamer().EmitCFIDefCfa(Register, Offset);
3966 return false;
3967}
3968
3969/// parseDirectiveCFIDefCfaOffset
3970/// ::= .cfi_def_cfa_offset offset
3971bool AsmParser::parseDirectiveCFIDefCfaOffset() {
3972 int64_t Offset = 0;
3973 if (parseAbsoluteExpression(Offset))
3974 return true;
3975
3976 getStreamer().EmitCFIDefCfaOffset(Offset);
3977 return false;
3978}
3979
3980/// parseDirectiveCFIRegister
3981/// ::= .cfi_register register, register
3982bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
3983 int64_t Register1 = 0, Register2 = 0;
3984 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) ||
3985 parseToken(AsmToken::Comma, "unexpected token in directive") ||
3986 parseRegisterOrRegisterNumber(Register2, DirectiveLoc))
3987 return true;
3988
3989 getStreamer().EmitCFIRegister(Register1, Register2);
3990 return false;
3991}
3992
3993/// parseDirectiveCFIWindowSave
3994/// ::= .cfi_window_save
3995bool AsmParser::parseDirectiveCFIWindowSave() {
3996 getStreamer().EmitCFIWindowSave();
3997 return false;
3998}
3999
4000/// parseDirectiveCFIAdjustCfaOffset
4001/// ::= .cfi_adjust_cfa_offset adjustment
4002bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
4003 int64_t Adjustment = 0;
4004 if (parseAbsoluteExpression(Adjustment))
4005 return true;
4006
4007 getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
4008 return false;
4009}
4010
4011/// parseDirectiveCFIDefCfaRegister
4012/// ::= .cfi_def_cfa_register register
4013bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
4014 int64_t Register = 0;
4015 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4016 return true;
4017
4018 getStreamer().EmitCFIDefCfaRegister(Register);
4019 return false;
4020}
4021
4022/// parseDirectiveCFIOffset
4023/// ::= .cfi_offset register, offset
4024bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
4025 int64_t Register = 0;
4026 int64_t Offset = 0;
4027
4028 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) ||
4029 parseToken(AsmToken::Comma, "unexpected token in directive") ||
4030 parseAbsoluteExpression(Offset))
4031 return true;
4032
4033 getStreamer().EmitCFIOffset(Register, Offset);
4034 return false;
4035}
4036
4037/// parseDirectiveCFIRelOffset
4038/// ::= .cfi_rel_offset register, offset
4039bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
4040 int64_t Register = 0, Offset = 0;
4041
4042 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) ||
4043 parseToken(AsmToken::Comma, "unexpected token in directive") ||
4044 parseAbsoluteExpression(Offset))
4045 return true;
4046
4047 getStreamer().EmitCFIRelOffset(Register, Offset);
4048 return false;
4049}
4050
4051static bool isValidEncoding(int64_t Encoding) {
4052 if (Encoding & ~0xff)
4053 return false;
4054
4055 if (Encoding == dwarf::DW_EH_PE_omit)
4056 return true;
4057
4058 const unsigned Format = Encoding & 0xf;
4059 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
4060 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
4061 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
4062 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
4063 return false;
4064
4065 const unsigned Application = Encoding & 0x70;
4066 if (Application != dwarf::DW_EH_PE_absptr &&
4067 Application != dwarf::DW_EH_PE_pcrel)
4068 return false;
4069
4070 return true;
4071}
4072
4073/// parseDirectiveCFIPersonalityOrLsda
4074/// IsPersonality true for cfi_personality, false for cfi_lsda
4075/// ::= .cfi_personality encoding, [symbol_name]
4076/// ::= .cfi_lsda encoding, [symbol_name]
4077bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
4078 int64_t Encoding = 0;
4079 if (parseAbsoluteExpression(Encoding))
4080 return true;
4081 if (Encoding == dwarf::DW_EH_PE_omit)
4082 return false;
4083
4084 StringRef Name;
4085 if (check(!isValidEncoding(Encoding), "unsupported encoding.") ||
4086 parseToken(AsmToken::Comma, "unexpected token in directive") ||
4087 check(parseIdentifier(Name), "expected identifier in directive"))
4088 return true;
4089
4090 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4091
4092 if (IsPersonality)
4093 getStreamer().EmitCFIPersonality(Sym, Encoding);
4094 else
4095 getStreamer().EmitCFILsda(Sym, Encoding);
4096 return false;
4097}
4098
4099/// parseDirectiveCFIRememberState
4100/// ::= .cfi_remember_state
4101bool AsmParser::parseDirectiveCFIRememberState() {
4102 getStreamer().EmitCFIRememberState();
4103 return false;
4104}
4105
4106/// parseDirectiveCFIRestoreState
4107/// ::= .cfi_remember_state
4108bool AsmParser::parseDirectiveCFIRestoreState() {
4109 getStreamer().EmitCFIRestoreState();
4110 return false;
4111}
4112
4113/// parseDirectiveCFISameValue
4114/// ::= .cfi_same_value register
4115bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
4116 int64_t Register = 0;
4117
4118 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4119 return true;
4120
4121 getStreamer().EmitCFISameValue(Register);
4122 return false;
4123}
4124
4125/// parseDirectiveCFIRestore
4126/// ::= .cfi_restore register
4127bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
4128 int64_t Register = 0;
4129 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4130 return true;
4131
4132 getStreamer().EmitCFIRestore(Register);
4133 return false;
4134}
4135
4136/// parseDirectiveCFIEscape
4137/// ::= .cfi_escape expression[,...]
4138bool AsmParser::parseDirectiveCFIEscape() {
4139 std::string Values;
4140 int64_t CurrValue;
4141 if (parseAbsoluteExpression(CurrValue))
4142 return true;
4143
4144 Values.push_back((uint8_t)CurrValue);
4145
4146 while (getLexer().is(AsmToken::Comma)) {
4147 Lex();
4148
4149 if (parseAbsoluteExpression(CurrValue))
4150 return true;
4151
4152 Values.push_back((uint8_t)CurrValue);
4153 }
4154
4155 getStreamer().EmitCFIEscape(Values);
4156 return false;
4157}
4158
4159/// parseDirectiveCFIReturnColumn
4160/// ::= .cfi_return_column register
4161bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) {
4162 int64_t Register = 0;
4163 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4164 return true;
4165 getStreamer().EmitCFIReturnColumn(Register);
4166 return false;
4167}
4168
4169/// parseDirectiveCFISignalFrame
4170/// ::= .cfi_signal_frame
4171bool AsmParser::parseDirectiveCFISignalFrame() {
4172 if (parseToken(AsmToken::EndOfStatement,
4173 "unexpected token in '.cfi_signal_frame'"))
4174 return true;
4175
4176 getStreamer().EmitCFISignalFrame();
4177 return false;
4178}
4179
4180/// parseDirectiveCFIUndefined
4181/// ::= .cfi_undefined register
4182bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
4183 int64_t Register = 0;
4184
4185 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4186 return true;
4187
4188 getStreamer().EmitCFIUndefined(Register);
4189 return false;
4190}
4191
4192/// parseDirectiveAltmacro
4193/// ::= .altmacro
4194/// ::= .noaltmacro
4195bool AsmParser::parseDirectiveAltmacro(StringRef Directive) {
4196 if (getLexer().isNot(AsmToken::EndOfStatement))
4197 return TokError("unexpected token in '" + Directive + "' directive");
4198 AltMacroMode = (Directive == ".altmacro");
4199 return false;
4200}
4201
4202/// parseDirectiveMacrosOnOff
4203/// ::= .macros_on
4204/// ::= .macros_off
4205bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
4206 if (parseToken(AsmToken::EndOfStatement,
4207 "unexpected token in '" + Directive + "' directive"))
4208 return true;
4209
4210 setMacrosEnabled(Directive == ".macros_on");
4211 return false;
4212}
4213
4214/// parseDirectiveMacro
4215/// ::= .macro name[,] [parameters]
4216bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
4217 StringRef Name;
4218 if (parseIdentifier(Name))
4219 return TokError("expected identifier in '.macro' directive");
4220
4221 if (getLexer().is(AsmToken::Comma))
4222 Lex();
4223
4224 MCAsmMacroParameters Parameters;
4225 while (getLexer().isNot(AsmToken::EndOfStatement)) {
4226
4227 if (!Parameters.empty() && Parameters.back().Vararg)
4228 return Error(Lexer.getLoc(),
4229 "Vararg parameter '" + Parameters.back().Name +
4230 "' should be last one in the list of parameters.");
4231
4232 MCAsmMacroParameter Parameter;
4233 if (parseIdentifier(Parameter.Name))
4234 return TokError("expected identifier in '.macro' directive");
4235
4236 // Emit an error if two (or more) named parameters share the same name
4237 for (const MCAsmMacroParameter& CurrParam : Parameters)
4238 if (CurrParam.Name.equals(Parameter.Name))
4239 return TokError("macro '" + Name + "' has multiple parameters"
4240 " named '" + Parameter.Name + "'");
4241
4242 if (Lexer.is(AsmToken::Colon)) {
4243 Lex(); // consume ':'
4244
4245 SMLoc QualLoc;
4246 StringRef Qualifier;
4247
4248 QualLoc = Lexer.getLoc();
4249 if (parseIdentifier(Qualifier))
4250 return Error(QualLoc, "missing parameter qualifier for "
4251 "'" + Parameter.Name + "' in macro '" + Name + "'");
4252
4253 if (Qualifier == "req")
4254 Parameter.Required = true;
4255 else if (Qualifier == "vararg")
4256 Parameter.Vararg = true;
4257 else
4258 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier "
4259 "for '" + Parameter.Name + "' in macro '" + Name + "'");
4260 }
4261
4262 if (getLexer().is(AsmToken::Equal)) {
4263 Lex();
4264
4265 SMLoc ParamLoc;
4266
4267 ParamLoc = Lexer.getLoc();
4268 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false ))
4269 return true;
4270
4271 if (Parameter.Required)
4272 Warning(ParamLoc, "pointless default value for required parameter "
4273 "'" + Parameter.Name + "' in macro '" + Name + "'");
4274 }
4275
4276 Parameters.push_back(std::move(Parameter));
4277
4278 if (getLexer().is(AsmToken::Comma))
4279 Lex();
4280 }
4281
4282 // Eat just the end of statement.
4283 Lexer.Lex();
4284
4285 // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors
4286 AsmToken EndToken, StartToken = getTok();
4287 unsigned MacroDepth = 0;
4288 // Lex the macro definition.
4289 while (true) {
4290 // Ignore Lexing errors in macros.
4291 while (Lexer.is(AsmToken::Error)) {
4292 Lexer.Lex();
4293 }
4294
4295 // Check whether we have reached the end of the file.
4296 if (getLexer().is(AsmToken::Eof))
4297 return Error(DirectiveLoc, "no matching '.endmacro' in definition");
4298
4299 // Otherwise, check whether we have reach the .endmacro.
4300 if (getLexer().is(AsmToken::Identifier)) {
4301 if (getTok().getIdentifier() == ".endm" ||
4302 getTok().getIdentifier() == ".endmacro") {
4303 if (MacroDepth == 0) { // Outermost macro.
4304 EndToken = getTok();
4305 Lexer.Lex();
4306 if (getLexer().isNot(AsmToken::EndOfStatement))
4307 return TokError("unexpected token in '" + EndToken.getIdentifier() +
4308 "' directive");
4309 break;
4310 } else {
4311 // Otherwise we just found the end of an inner macro.
4312 --MacroDepth;
4313 }
4314 } else if (getTok().getIdentifier() == ".macro") {
4315 // We allow nested macros. Those aren't instantiated until the outermost
4316 // macro is expanded so just ignore them for now.
4317 ++MacroDepth;
4318 }
4319 }
4320
4321 // Otherwise, scan til the end of the statement.
4322 eatToEndOfStatement();
4323 }
4324
4325 if (getContext().lookupMacro(Name)) {
4326 return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
4327 }
4328
4329 const char *BodyStart = StartToken.getLoc().getPointer();
4330 const char *BodyEnd = EndToken.getLoc().getPointer();
4331 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
4332 checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
4333 MCAsmMacro Macro(Name, Body, std::move(Parameters));
4334 DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("asm-macros")) { dbgs() << "Defining new macro:\n"; Macro
.dump(); } } while (false)
4335 Macro.dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("asm-macros")) { dbgs() << "Defining new macro:\n"; Macro
.dump(); } } while (false)
;
4336 getContext().defineMacro(Name, std::move(Macro));
4337 return false;
4338}
4339
4340/// checkForBadMacro
4341///
4342/// With the support added for named parameters there may be code out there that
4343/// is transitioning from positional parameters. In versions of gas that did
4344/// not support named parameters they would be ignored on the macro definition.
4345/// But to support both styles of parameters this is not possible so if a macro
4346/// definition has named parameters but does not use them and has what appears
4347/// to be positional parameters, strings like $1, $2, ... and $n, then issue a
4348/// warning that the positional parameter found in body which have no effect.
4349/// Hoping the developer will either remove the named parameters from the macro
4350/// definition so the positional parameters get used if that was what was
4351/// intended or change the macro to use the named parameters. It is possible
4352/// this warning will trigger when the none of the named parameters are used
4353/// and the strings like $1 are infact to simply to be passed trough unchanged.
4354void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
4355 StringRef Body,
4356 ArrayRef<MCAsmMacroParameter> Parameters) {
4357 // If this macro is not defined with named parameters the warning we are
4358 // checking for here doesn't apply.
4359 unsigned NParameters = Parameters.size();
4360 if (NParameters == 0)
4361 return;
4362
4363 bool NamedParametersFound = false;
4364 bool PositionalParametersFound = false;
4365
4366 // Look at the body of the macro for use of both the named parameters and what
4367 // are likely to be positional parameters. This is what expandMacro() is
4368 // doing when it finds the parameters in the body.
4369 while (!Body.empty()) {
4370 // Scan for the next possible parameter.
4371 std::size_t End = Body.size(), Pos = 0;
4372 for (; Pos != End; ++Pos) {
4373 // Check for a substitution or escape.
4374 // This macro is defined with parameters, look for \foo, \bar, etc.
4375 if (Body[Pos] == '\\' && Pos + 1 != End)
4376 break;
4377
4378 // This macro should have parameters, but look for $0, $1, ..., $n too.
4379 if (Body[Pos] != '$' || Pos + 1 == End)
4380 continue;
4381 char Next = Body[Pos + 1];
4382 if (Next == '$' || Next == 'n' ||
4383 isdigit(static_cast<unsigned char>(Next)))
4384 break;
4385 }
4386
4387 // Check if we reached the end.
4388 if (Pos == End)
4389 break;
4390
4391 if (Body[Pos] == '$') {
4392 switch (Body[Pos + 1]) {
4393 // $$ => $
4394 case '$':
4395 break;
4396
4397 // $n => number of arguments
4398 case 'n':
4399 PositionalParametersFound = true;
4400 break;
4401
4402 // $[0-9] => argument
4403 default: {
4404 PositionalParametersFound = true;
4405 break;
4406 }
4407 }
4408 Pos += 2;
4409 } else {
4410 unsigned I = Pos + 1;
4411 while (isIdentifierChar(Body[I]) && I + 1 != End)
4412 ++I;
4413
4414 const char *Begin = Body.data() + Pos + 1;
4415 StringRef Argument(Begin, I - (Pos + 1));
4416 unsigned Index = 0;
4417 for (; Index < NParameters; ++Index)
4418 if (Parameters[Index].Name == Argument)
4419 break;
4420
4421 if (Index == NParameters) {
4422 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
4423 Pos += 3;
4424 else {
4425 Pos = I;
4426 }
4427 } else {
4428 NamedParametersFound = true;
4429 Pos += 1 + Argument.size();
4430 }
4431 }
4432 // Update the scan point.
4433 Body = Body.substr(Pos);
4434 }
4435
4436 if (!NamedParametersFound && PositionalParametersFound)
4437 Warning(DirectiveLoc, "macro defined with named parameters which are not "
4438 "used in macro body, possible positional parameter "
4439 "found in body which will have no effect");
4440}
4441
4442/// parseDirectiveExitMacro
4443/// ::= .exitm
4444bool AsmParser::parseDirectiveExitMacro(StringRef Directive) {
4445 if (parseToken(AsmToken::EndOfStatement,
4446 "unexpected token in '" + Directive + "' directive"))
4447 return true;
4448
4449 if (!isInsideMacroInstantiation())
4450 return TokError("unexpected '" + Directive + "' in file, "
4451 "no current macro definition");
4452
4453 // Exit all conditionals that are active in the current macro.
4454 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) {
4455 TheCondState = TheCondStack.back();
4456 TheCondStack.pop_back();
4457 }
4458
4459 handleMacroExit();
4460 return false;
4461}
4462
4463/// parseDirectiveEndMacro
4464/// ::= .endm
4465/// ::= .endmacro
4466bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
4467 if (getLexer().isNot(AsmToken::EndOfStatement))
4468 return TokError("unexpected token in '" + Directive + "' directive");
4469
4470 // If we are inside a macro instantiation, terminate the current
4471 // instantiation.
4472 if (isInsideMacroInstantiation()) {
4473 handleMacroExit();
4474 return false;
4475 }
4476
4477 // Otherwise, this .endmacro is a stray entry in the file; well formed
4478 // .endmacro directives are handled during the macro definition parsing.
4479 return TokError("unexpected '" + Directive + "' in file, "
4480 "no current macro definition");
4481}
4482
4483/// parseDirectivePurgeMacro
4484/// ::= .purgem
4485bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
4486 StringRef Name;
4487 SMLoc Loc;
4488 if (parseTokenLoc(Loc) ||
4489 check(parseIdentifier(Name), Loc,
4490 "expected identifier in '.purgem' directive") ||
4491 parseToken(AsmToken::EndOfStatement,
4492 "unexpected token in '.purgem' directive"))
4493 return true;
4494
4495 if (!getContext().lookupMacro(Name))
4496 return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
4497
4498 getContext().undefineMacro(Name);
4499 DEBUG_WITH_TYPE("asm-macros", dbgs()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("asm-macros")) { dbgs() << "Un-defining macro: " <<
Name << "\n"; } } while (false)
4500 << "Un-defining macro: " << Name << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("asm-macros")) { dbgs() << "Un-defining macro: " <<
Name << "\n"; } } while (false)
;
4501 return false;
4502}
4503
4504/// parseDirectiveBundleAlignMode
4505/// ::= {.bundle_align_mode} expression
4506bool AsmParser::parseDirectiveBundleAlignMode() {
4507 // Expect a single argument: an expression that evaluates to a constant
4508 // in the inclusive range 0-30.
4509 SMLoc ExprLoc = getLexer().getLoc();
4510 int64_t AlignSizePow2;
4511 if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) ||
4512 parseToken(AsmToken::EndOfStatement, "unexpected token after expression "
4513 "in '.bundle_align_mode' "
4514 "directive") ||
4515 check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc,
4516 "invalid bundle alignment size (expected between 0 and 30)"))
4517 return true;
4518
4519 // Because of AlignSizePow2's verified range we can safely truncate it to
4520 // unsigned.
4521 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
4522 return false;
4523}
4524
4525/// parseDirectiveBundleLock
4526/// ::= {.bundle_lock} [align_to_end]
4527bool AsmParser::parseDirectiveBundleLock() {
4528 if (checkForValidSection())
4529 return true;
4530 bool AlignToEnd = false;
4531
4532 StringRef Option;
4533 SMLoc Loc = getTok().getLoc();
4534 const char *kInvalidOptionError =
4535 "invalid option for '.bundle_lock' directive";
4536
4537 if (!parseOptionalToken(AsmToken::EndOfStatement)) {
4538 if (check(parseIdentifier(Option), Loc, kInvalidOptionError) ||
4539 check(Option != "align_to_end", Loc, kInvalidOptionError) ||
4540 parseToken(AsmToken::EndOfStatement,
4541 "unexpected token after '.bundle_lock' directive option"))
4542 return true;
4543 AlignToEnd = true;
4544 }
4545
4546 getStreamer().EmitBundleLock(AlignToEnd);
4547 return false;
4548}
4549
4550/// parseDirectiveBundleLock
4551/// ::= {.bundle_lock}
4552bool AsmParser::parseDirectiveBundleUnlock() {
4553 if (checkForValidSection() ||
4554 parseToken(AsmToken::EndOfStatement,
4555 "unexpected token in '.bundle_unlock' directive"))
4556 return true;
4557
4558 getStreamer().EmitBundleUnlock();
4559 return false;
4560}
4561
4562/// parseDirectiveSpace
4563/// ::= (.skip | .space) expression [ , expression ]
4564bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
4565 SMLoc NumBytesLoc = Lexer.getLoc();
4566 const MCExpr *NumBytes;
4567 if (checkForValidSection() || parseExpression(NumBytes))
4568 return true;
4569
4570 int64_t FillExpr = 0;
4571 if (parseOptionalToken(AsmToken::Comma))
4572 if (parseAbsoluteExpression(FillExpr))
4573 return addErrorSuffix("in '" + Twine(IDVal) + "' directive");
4574 if (parseToken(AsmToken::EndOfStatement))
4575 return addErrorSuffix("in '" + Twine(IDVal) + "' directive");
4576
4577 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
4578 getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc);
4579
4580 return false;
4581}
4582
4583/// parseDirectiveDCB
4584/// ::= .dcb.{b, l, w} expression, expression
4585bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) {
4586 SMLoc NumValuesLoc = Lexer.getLoc();
4587 int64_t NumValues;
4588 if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4589 return true;
4590
4591 if (NumValues < 0) {
4592 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4593 return false;
4594 }
4595
4596 if (parseToken(AsmToken::Comma,
4597 "unexpected token in '" + Twine(IDVal) + "' directive"))
4598 return true;
4599
4600 const MCExpr *Value;
4601 SMLoc ExprLoc = getLexer().getLoc();
4602 if (parseExpression(Value))
4603 return true;
4604
4605 // Special case constant expressions to match code generator.
4606 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
4607 assert(Size <= 8 && "Invalid size")((Size <= 8 && "Invalid size") ? static_cast<void
> (0) : __assert_fail ("Size <= 8 && \"Invalid size\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 4607, __PRETTY_FUNCTION__))
;
4608 uint64_t IntValue = MCE->getValue();
4609 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
4610 return Error(ExprLoc, "literal value out of range for directive");
4611 for (uint64_t i = 0, e = NumValues; i != e; ++i)
4612 getStreamer().EmitIntValue(IntValue, Size);
4613 } else {
4614 for (uint64_t i = 0, e = NumValues; i != e; ++i)
4615 getStreamer().EmitValue(Value, Size, ExprLoc);
4616 }
4617
4618 if (parseToken(AsmToken::EndOfStatement,
4619 "unexpected token in '" + Twine(IDVal) + "' directive"))
4620 return true;
4621
4622 return false;
4623}
4624
4625/// parseDirectiveRealDCB
4626/// ::= .dcb.{d, s} expression, expression
4627bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) {
4628 SMLoc NumValuesLoc = Lexer.getLoc();
4629 int64_t NumValues;
4630 if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4631 return true;
4632
4633 if (NumValues < 0) {
4634 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4635 return false;
4636 }
4637
4638 if (parseToken(AsmToken::Comma,
4639 "unexpected token in '" + Twine(IDVal) + "' directive"))
4640 return true;
4641
4642 APInt AsInt;
4643 if (parseRealValue(Semantics, AsInt))
4644 return true;
4645
4646 if (parseToken(AsmToken::EndOfStatement,
4647 "unexpected token in '" + Twine(IDVal) + "' directive"))
4648 return true;
4649
4650 for (uint64_t i = 0, e = NumValues; i != e; ++i)
4651 getStreamer().EmitIntValue(AsInt.getLimitedValue(),
4652 AsInt.getBitWidth() / 8);
4653
4654 return false;
4655}
4656
4657/// parseDirectiveDS
4658/// ::= .ds.{b, d, l, p, s, w, x} expression
4659bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) {
4660 SMLoc NumValuesLoc = Lexer.getLoc();
4661 int64_t NumValues;
4662 if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4663 return true;
4664
4665 if (NumValues < 0) {
4666 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4667 return false;
4668 }
4669
4670 if (parseToken(AsmToken::EndOfStatement,
4671 "unexpected token in '" + Twine(IDVal) + "' directive"))
4672 return true;
4673
4674 for (uint64_t i = 0, e = NumValues; i != e; ++i)
4675 getStreamer().emitFill(Size, 0);
4676
4677 return false;
4678}
4679
4680/// parseDirectiveLEB128
4681/// ::= (.sleb128 | .uleb128) [ expression (, expression)* ]
4682bool AsmParser::parseDirectiveLEB128(bool Signed) {
4683 if (checkForValidSection())
4684 return true;
4685
4686 auto parseOp = [&]() -> bool {
4687 const MCExpr *Value;
4688 if (parseExpression(Value))
4689 return true;
4690 if (Signed)
4691 getStreamer().EmitSLEB128Value(Value);
4692 else
4693 getStreamer().EmitULEB128Value(Value);
4694 return false;
4695 };
4696
4697 if (parseMany(parseOp))
4698 return addErrorSuffix(" in directive");
4699
4700 return false;
4701}
4702
4703/// parseDirectiveSymbolAttribute
4704/// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
4705bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
4706 auto parseOp = [&]() -> bool {
4707 StringRef Name;
4708 SMLoc Loc = getTok().getLoc();
4709 if (parseIdentifier(Name))
4710 return Error(Loc, "expected identifier");
4711 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4712
4713 // Assembler local symbols don't make any sense here. Complain loudly.
4714 if (Sym->isTemporary())
4715 return Error(Loc, "non-local symbol required");
4716
4717 if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
4718 return Error(Loc, "unable to emit symbol attribute");
4719 return false;
4720 };
4721
4722 if (parseMany(parseOp))
4723 return addErrorSuffix(" in directive");
4724 return false;
4725}
4726
4727/// parseDirectiveComm
4728/// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
4729bool AsmParser::parseDirectiveComm(bool IsLocal) {
4730 if (checkForValidSection())
4731 return true;
4732
4733 SMLoc IDLoc = getLexer().getLoc();
4734 StringRef Name;
4735 if (parseIdentifier(Name))
4736 return TokError("expected identifier in directive");
4737
4738 // Handle the identifier as the key symbol.
4739 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4740
4741 if (getLexer().isNot(AsmToken::Comma))
4742 return TokError("unexpected token in directive");
4743 Lex();
4744
4745 int64_t Size;
4746 SMLoc SizeLoc = getLexer().getLoc();
4747 if (parseAbsoluteExpression(Size))
4748 return true;
4749
4750 int64_t Pow2Alignment = 0;
4751 SMLoc Pow2AlignmentLoc;
4752 if (getLexer().is(AsmToken::Comma)) {
4753 Lex();
4754 Pow2AlignmentLoc = getLexer().getLoc();
4755 if (parseAbsoluteExpression(Pow2Alignment))
4756 return true;
4757
4758 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
4759 if (IsLocal && LCOMM == LCOMM::NoAlignment)
4760 return Error(Pow2AlignmentLoc, "alignment not supported on this target");
4761
4762 // If this target takes alignments in bytes (not log) validate and convert.
4763 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
4764 (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
4765 if (!isPowerOf2_64(Pow2Alignment))
4766 return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
4767 Pow2Alignment = Log2_64(Pow2Alignment);
4768 }
4769 }
4770
4771 if (parseToken(AsmToken::EndOfStatement,
4772 "unexpected token in '.comm' or '.lcomm' directive"))
4773 return true;
4774
4775 // NOTE: a size of zero for a .comm should create a undefined symbol
4776 // but a size of .lcomm creates a bss symbol of size zero.
4777 if (Size < 0)
4778 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
4779 "be less than zero");
4780
4781 // NOTE: The alignment in the directive is a power of 2 value, the assembler
4782 // may internally end up wanting an alignment in bytes.
4783 // FIXME: Diagnose overflow.
4784 if (Pow2Alignment < 0)
4785 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
4786 "alignment, can't be less than zero");
4787
4788 Sym->redefineIfPossible();
4789 if (!Sym->isUndefined())
4790 return Error(IDLoc, "invalid symbol redefinition");
4791
4792 // Create the Symbol as a common or local common with Size and Pow2Alignment
4793 if (IsLocal) {
4794 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
4795 return false;
4796 }
4797
4798 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
4799 return false;
4800}
4801
4802/// parseDirectiveAbort
4803/// ::= .abort [... message ...]
4804bool AsmParser::parseDirectiveAbort() {
4805 // FIXME: Use loc from directive.
4806 SMLoc Loc = getLexer().getLoc();
4807
4808 StringRef Str = parseStringToEndOfStatement();
4809 if (parseToken(AsmToken::EndOfStatement,
4810 "unexpected token in '.abort' directive"))
4811 return true;
4812
4813 if (Str.empty())
4814 return Error(Loc, ".abort detected. Assembly stopping.");
4815 else
4816 return Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
4817 // FIXME: Actually abort assembly here.
4818
4819 return false;
4820}
4821
4822/// parseDirectiveInclude
4823/// ::= .include "filename"
4824bool AsmParser::parseDirectiveInclude() {
4825 // Allow the strings to have escaped octal character sequence.
4826 std::string Filename;
4827 SMLoc IncludeLoc = getTok().getLoc();
4828
4829 if (check(getTok().isNot(AsmToken::String),
4830 "expected string in '.include' directive") ||
4831 parseEscapedString(Filename) ||
4832 check(getTok().isNot(AsmToken::EndOfStatement),
4833 "unexpected token in '.include' directive") ||
4834 // Attempt to switch the lexer to the included file before consuming the
4835 // end of statement to avoid losing it when we switch.
4836 check(enterIncludeFile(Filename), IncludeLoc,
4837 "Could not find include file '" + Filename + "'"))
4838 return true;
4839
4840 return false;
4841}
4842
4843/// parseDirectiveIncbin
4844/// ::= .incbin "filename" [ , skip [ , count ] ]
4845bool AsmParser::parseDirectiveIncbin() {
4846 // Allow the strings to have escaped octal character sequence.
4847 std::string Filename;
4848 SMLoc IncbinLoc = getTok().getLoc();
4849 if (check(getTok().isNot(AsmToken::String),
4850 "expected string in '.incbin' directive") ||
4851 parseEscapedString(Filename))
4852 return true;
4853
4854 int64_t Skip = 0;
4855 const MCExpr *Count = nullptr;
4856 SMLoc SkipLoc, CountLoc;
4857 if (parseOptionalToken(AsmToken::Comma)) {
4858 // The skip expression can be omitted while specifying the count, e.g:
4859 // .incbin "filename",,4
4860 if (getTok().isNot(AsmToken::Comma)) {
4861 if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip))
4862 return true;
4863 }
4864 if (parseOptionalToken(AsmToken::Comma)) {
4865 CountLoc = getTok().getLoc();
4866 if (parseExpression(Count))
4867 return true;
4868 }
4869 }
4870
4871 if (parseToken(AsmToken::EndOfStatement,
4872 "unexpected token in '.incbin' directive"))
4873 return true;
4874
4875 if (check(Skip < 0, SkipLoc, "skip is negative"))
4876 return true;
4877
4878 // Attempt to process the included file.
4879 if (processIncbinFile(Filename, Skip, Count, CountLoc))
4880 return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
4881 return false;
4882}
4883
4884/// parseDirectiveIf
4885/// ::= .if{,eq,ge,gt,le,lt,ne} expression
4886bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) {
4887 TheCondStack.push_back(TheCondState);
4888 TheCondState.TheCond = AsmCond::IfCond;
4889 if (TheCondState.Ignore) {
4890 eatToEndOfStatement();
4891 } else {
4892 int64_t ExprValue;
4893 if (parseAbsoluteExpression(ExprValue) ||
4894 parseToken(AsmToken::EndOfStatement,
4895 "unexpected token in '.if' directive"))
4896 return true;
4897
4898 switch (DirKind) {
4899 default:
4900 llvm_unreachable("unsupported directive")::llvm::llvm_unreachable_internal("unsupported directive", "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 4900)
;
4901 case DK_IF:
4902 case DK_IFNE:
4903 break;
4904 case DK_IFEQ:
4905 ExprValue = ExprValue == 0;
4906 break;
4907 case DK_IFGE:
4908 ExprValue = ExprValue >= 0;
4909 break;
4910 case DK_IFGT:
4911 ExprValue = ExprValue > 0;
4912 break;
4913 case DK_IFLE:
4914 ExprValue = ExprValue <= 0;
4915 break;
4916 case DK_IFLT:
4917 ExprValue = ExprValue < 0;
4918 break;
4919 }
4920
4921 TheCondState.CondMet = ExprValue;
4922 TheCondState.Ignore = !TheCondState.CondMet;
4923 }
4924
4925 return false;
4926}
4927
4928/// parseDirectiveIfb
4929/// ::= .ifb string
4930bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
4931 TheCondStack.push_back(TheCondState);
4932 TheCondState.TheCond = AsmCond::IfCond;
4933
4934 if (TheCondState.Ignore) {
4935 eatToEndOfStatement();
4936 } else {
4937 StringRef Str = parseStringToEndOfStatement();
4938
4939 if (parseToken(AsmToken::EndOfStatement,
4940 "unexpected token in '.ifb' directive"))
4941 return true;
4942
4943 TheCondState.CondMet = ExpectBlank == Str.empty();
4944 TheCondState.Ignore = !TheCondState.CondMet;
4945 }
4946
4947 return false;
4948}
4949
4950/// parseDirectiveIfc
4951/// ::= .ifc string1, string2
4952/// ::= .ifnc string1, string2
4953bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
4954 TheCondStack.push_back(TheCondState);
4955 TheCondState.TheCond = AsmCond::IfCond;
4956
4957 if (TheCondState.Ignore) {
4958 eatToEndOfStatement();
4959 } else {
4960 StringRef Str1 = parseStringToComma();
4961
4962 if (parseToken(AsmToken::Comma, "unexpected token in '.ifc' directive"))
4963 return true;
4964
4965 StringRef Str2 = parseStringToEndOfStatement();
4966
4967 if (parseToken(AsmToken::EndOfStatement,
4968 "unexpected token in '.ifc' directive"))
4969 return true;
4970
4971 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim());
4972 TheCondState.Ignore = !TheCondState.CondMet;
4973 }
4974
4975 return false;
4976}
4977
4978/// parseDirectiveIfeqs
4979/// ::= .ifeqs string1, string2
4980bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) {
4981 if (Lexer.isNot(AsmToken::String)) {
4982 if (ExpectEqual)
4983 return TokError("expected string parameter for '.ifeqs' directive");
4984 return TokError("expected string parameter for '.ifnes' directive");
4985 }
4986
4987 StringRef String1 = getTok().getStringContents();
4988 Lex();
4989
4990 if (Lexer.isNot(AsmToken::Comma)) {
4991 if (ExpectEqual)
4992 return TokError(
4993 "expected comma after first string for '.ifeqs' directive");
4994 return TokError("expected comma after first string for '.ifnes' directive");
4995 }
4996
4997 Lex();
4998
4999 if (Lexer.isNot(AsmToken::String)) {
5000 if (ExpectEqual)
5001 return TokError("expected string parameter for '.ifeqs' directive");
5002 return TokError("expected string parameter for '.ifnes' directive");
5003 }
5004
5005 StringRef String2 = getTok().getStringContents();
5006 Lex();
5007
5008 TheCondStack.push_back(TheCondState);
5009 TheCondState.TheCond = AsmCond::IfCond;
5010 TheCondState.CondMet = ExpectEqual == (String1 == String2);
5011 TheCondState.Ignore = !TheCondState.CondMet;
5012
5013 return false;
5014}
5015
5016/// parseDirectiveIfdef
5017/// ::= .ifdef symbol
5018bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
5019 StringRef Name;
5020 TheCondStack.push_back(TheCondState);
5021 TheCondState.TheCond = AsmCond::IfCond;
5022
5023 if (TheCondState.Ignore) {
5024 eatToEndOfStatement();
5025 } else {
5026 if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") ||
5027 parseToken(AsmToken::EndOfStatement, "unexpected token in '.ifdef'"))
5028 return true;
5029
5030 MCSymbol *Sym = getContext().lookupSymbol(Name);
5031
5032 if (expect_defined)
5033 TheCondState.CondMet = (Sym && !Sym->isUndefined());
5034 else
5035 TheCondState.CondMet = (!Sym || Sym->isUndefined());
5036 TheCondState.Ignore = !TheCondState.CondMet;
5037 }
5038
5039 return false;
5040}
5041
5042/// parseDirectiveElseIf
5043/// ::= .elseif expression
5044bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
5045 if (TheCondState.TheCond != AsmCond::IfCond &&
5046 TheCondState.TheCond != AsmCond::ElseIfCond)
5047 return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an"
5048 " .if or an .elseif");
5049 TheCondState.TheCond = AsmCond::ElseIfCond;
5050
5051 bool LastIgnoreState = false;
5052 if (!TheCondStack.empty())
5053 LastIgnoreState = TheCondStack.back().Ignore;
5054 if (LastIgnoreState || TheCondState.CondMet) {
5055 TheCondState.Ignore = true;
5056 eatToEndOfStatement();
5057 } else {
5058 int64_t ExprValue;
5059 if (parseAbsoluteExpression(ExprValue))
5060 return true;
5061
5062 if (parseToken(AsmToken::EndOfStatement,
5063 "unexpected token in '.elseif' directive"))
5064 return true;
5065
5066 TheCondState.CondMet = ExprValue;
5067 TheCondState.Ignore = !TheCondState.CondMet;
5068 }
5069
5070 return false;
5071}
5072
5073/// parseDirectiveElse
5074/// ::= .else
5075bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
5076 if (parseToken(AsmToken::EndOfStatement,
5077 "unexpected token in '.else' directive"))
5078 return true;
5079
5080 if (TheCondState.TheCond != AsmCond::IfCond &&
5081 TheCondState.TheCond != AsmCond::ElseIfCond)
5082 return Error(DirectiveLoc, "Encountered a .else that doesn't follow "
5083 " an .if or an .elseif");
5084 TheCondState.TheCond = AsmCond::ElseCond;
5085 bool LastIgnoreState = false;
5086 if (!TheCondStack.empty())
5087 LastIgnoreState = TheCondStack.back().Ignore;
5088 if (LastIgnoreState || TheCondState.CondMet)
5089 TheCondState.Ignore = true;
5090 else
5091 TheCondState.Ignore = false;
5092
5093 return false;
5094}
5095
5096/// parseDirectiveEnd
5097/// ::= .end
5098bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) {
5099 if (parseToken(AsmToken::EndOfStatement,
5100 "unexpected token in '.end' directive"))
5101 return true;
5102
5103 while (Lexer.isNot(AsmToken::Eof))
5104 Lexer.Lex();
5105
5106 return false;
5107}
5108
5109/// parseDirectiveError
5110/// ::= .err
5111/// ::= .error [string]
5112bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) {
5113 if (!TheCondStack.empty()) {
5114 if (TheCondStack.back().Ignore) {
5115 eatToEndOfStatement();
5116 return false;
5117 }
5118 }
5119
5120 if (!WithMessage)
5121 return Error(L, ".err encountered");
5122
5123 StringRef Message = ".error directive invoked in source file";
5124 if (Lexer.isNot(AsmToken::EndOfStatement)) {
5125 if (Lexer.isNot(AsmToken::String))
5126 return TokError(".error argument must be a string");
5127
5128 Message = getTok().getStringContents();
5129 Lex();
5130 }
5131
5132 return Error(L, Message);
5133}
5134
5135/// parseDirectiveWarning
5136/// ::= .warning [string]
5137bool AsmParser::parseDirectiveWarning(SMLoc L) {
5138 if (!TheCondStack.empty()) {
5139 if (TheCondStack.back().Ignore) {
5140 eatToEndOfStatement();
5141 return false;
5142 }
5143 }
5144
5145 StringRef Message = ".warning directive invoked in source file";
5146
5147 if (!parseOptionalToken(AsmToken::EndOfStatement)) {
5148 if (Lexer.isNot(AsmToken::String))
5149 return TokError(".warning argument must be a string");
5150
5151 Message = getTok().getStringContents();
5152 Lex();
5153 if (parseToken(AsmToken::EndOfStatement,
5154 "expected end of statement in '.warning' directive"))
5155 return true;
5156 }
5157
5158 return Warning(L, Message);
5159}
5160
5161/// parseDirectiveEndIf
5162/// ::= .endif
5163bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
5164 if (parseToken(AsmToken::EndOfStatement,
5165 "unexpected token in '.endif' directive"))
5166 return true;
5167
5168 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
5169 return Error(DirectiveLoc, "Encountered a .endif that doesn't follow "
5170 "an .if or .else");
5171 if (!TheCondStack.empty()) {
5172 TheCondState = TheCondStack.back();
5173 TheCondStack.pop_back();
5174 }
5175
5176 return false;
5177}
5178
5179void AsmParser::initializeDirectiveKindMap() {
5180 DirectiveKindMap[".set"] = DK_SET;
5181 DirectiveKindMap[".equ"] = DK_EQU;
5182 DirectiveKindMap[".equiv"] = DK_EQUIV;
5183 DirectiveKindMap[".ascii"] = DK_ASCII;
5184 DirectiveKindMap[".asciz"] = DK_ASCIZ;
5185 DirectiveKindMap[".string"] = DK_STRING;
5186 DirectiveKindMap[".byte"] = DK_BYTE;
5187 DirectiveKindMap[".short"] = DK_SHORT;
5188 DirectiveKindMap[".value"] = DK_VALUE;
5189 DirectiveKindMap[".2byte"] = DK_2BYTE;
5190 DirectiveKindMap[".long"] = DK_LONG;
5191 DirectiveKindMap[".int"] = DK_INT;
5192 DirectiveKindMap[".4byte"] = DK_4BYTE;
5193 DirectiveKindMap[".quad"] = DK_QUAD;
5194 DirectiveKindMap[".8byte"] = DK_8BYTE;
5195 DirectiveKindMap[".octa"] = DK_OCTA;
5196 DirectiveKindMap[".single"] = DK_SINGLE;
5197 DirectiveKindMap[".float"] = DK_FLOAT;
5198 DirectiveKindMap[".double"] = DK_DOUBLE;
5199 DirectiveKindMap[".align"] = DK_ALIGN;
5200 DirectiveKindMap[".align32"] = DK_ALIGN32;
5201 DirectiveKindMap[".balign"] = DK_BALIGN;
5202 DirectiveKindMap[".balignw"] = DK_BALIGNW;
5203 DirectiveKindMap[".balignl"] = DK_BALIGNL;
5204 DirectiveKindMap[".p2align"] = DK_P2ALIGN;
5205 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
5206 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
5207 DirectiveKindMap[".org"] = DK_ORG;
5208 DirectiveKindMap[".fill"] = DK_FILL;
5209 DirectiveKindMap[".zero"] = DK_ZERO;
5210 DirectiveKindMap[".extern"] = DK_EXTERN;
5211 DirectiveKindMap[".globl"] = DK_GLOBL;
5212 DirectiveKindMap[".global"] = DK_GLOBAL;
5213 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
5214 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
5215 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
5216 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
5217 DirectiveKindMap[".reference"] = DK_REFERENCE;
5218 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
5219 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
5220 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
5221 DirectiveKindMap[".comm"] = DK_COMM;
5222 DirectiveKindMap[".common"] = DK_COMMON;
5223 DirectiveKindMap[".lcomm"] = DK_LCOMM;
5224 DirectiveKindMap[".abort"] = DK_ABORT;
5225 DirectiveKindMap[".include"] = DK_INCLUDE;
5226 DirectiveKindMap[".incbin"] = DK_INCBIN;
5227 DirectiveKindMap[".code16"] = DK_CODE16;
5228 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
5229 DirectiveKindMap[".rept"] = DK_REPT;
5230 DirectiveKindMap[".rep"] = DK_REPT;
5231 DirectiveKindMap[".irp"] = DK_IRP;
5232 DirectiveKindMap[".irpc"] = DK_IRPC;
5233 DirectiveKindMap[".endr"] = DK_ENDR;
5234 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
5235 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
5236 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
5237 DirectiveKindMap[".if"] = DK_IF;
5238 DirectiveKindMap[".ifeq"] = DK_IFEQ;
5239 DirectiveKindMap[".ifge"] = DK_IFGE;
5240 DirectiveKindMap[".ifgt"] = DK_IFGT;
5241 DirectiveKindMap[".ifle"] = DK_IFLE;
5242 DirectiveKindMap[".iflt"] = DK_IFLT;
5243 DirectiveKindMap[".ifne"] = DK_IFNE;
5244 DirectiveKindMap[".ifb"] = DK_IFB;
5245 DirectiveKindMap[".ifnb"] = DK_IFNB;
5246 DirectiveKindMap[".ifc"] = DK_IFC;
5247 DirectiveKindMap[".ifeqs"] = DK_IFEQS;
5248 DirectiveKindMap[".ifnc"] = DK_IFNC;
5249 DirectiveKindMap[".ifnes"] = DK_IFNES;
5250 DirectiveKindMap[".ifdef"] = DK_IFDEF;
5251 DirectiveKindMap[".ifndef"] = DK_IFNDEF;
5252 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
5253 DirectiveKindMap[".elseif"] = DK_ELSEIF;
5254 DirectiveKindMap[".else"] = DK_ELSE;
5255 DirectiveKindMap[".end"] = DK_END;
5256 DirectiveKindMap[".endif"] = DK_ENDIF;
5257 DirectiveKindMap[".skip"] = DK_SKIP;
5258 DirectiveKindMap[".space"] = DK_SPACE;
5259 DirectiveKindMap[".file"] = DK_FILE;
5260 DirectiveKindMap[".line"] = DK_LINE;
5261 DirectiveKindMap[".loc"] = DK_LOC;
5262 DirectiveKindMap[".stabs"] = DK_STABS;
5263 DirectiveKindMap[".cv_file"] = DK_CV_FILE;
5264 DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID;
5265 DirectiveKindMap[".cv_loc"] = DK_CV_LOC;
5266 DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE;
5267 DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE;
5268 DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID;
5269 DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE;
5270 DirectiveKindMap[".cv_string"] = DK_CV_STRING;
5271 DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE;
5272 DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS;
5273 DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET;
5274 DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA;
5275 DirectiveKindMap[".sleb128"] = DK_SLEB128;
5276 DirectiveKindMap[".uleb128"] = DK_ULEB128;
5277 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
5278 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
5279 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
5280 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
5281 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
5282 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
5283 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
5284 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
5285 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
5286 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
5287 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
5288 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
5289 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
5290 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
5291 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
5292 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
5293 DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN;
5294 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
5295 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
5296 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
5297 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
5298 DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
5299 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
5300 DirectiveKindMap[".macro"] = DK_MACRO;
5301 DirectiveKindMap[".exitm"] = DK_EXITM;
5302 DirectiveKindMap[".endm"] = DK_ENDM;
5303 DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
5304 DirectiveKindMap[".purgem"] = DK_PURGEM;
5305 DirectiveKindMap[".err"] = DK_ERR;
5306 DirectiveKindMap[".error"] = DK_ERROR;
5307 DirectiveKindMap[".warning"] = DK_WARNING;
5308 DirectiveKindMap[".altmacro"] = DK_ALTMACRO;
5309 DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO;
5310 DirectiveKindMap[".reloc"] = DK_RELOC;
5311 DirectiveKindMap[".dc"] = DK_DC;
5312 DirectiveKindMap[".dc.a"] = DK_DC_A;
5313 DirectiveKindMap[".dc.b"] = DK_DC_B;
5314 DirectiveKindMap[".dc.d"] = DK_DC_D;
5315 DirectiveKindMap[".dc.l"] = DK_DC_L;
5316 DirectiveKindMap[".dc.s"] = DK_DC_S;
5317 DirectiveKindMap[".dc.w"] = DK_DC_W;
5318 DirectiveKindMap[".dc.x"] = DK_DC_X;
5319 DirectiveKindMap[".dcb"] = DK_DCB;
5320 DirectiveKindMap[".dcb.b"] = DK_DCB_B;
5321 DirectiveKindMap[".dcb.d"] = DK_DCB_D;
5322 DirectiveKindMap[".dcb.l"] = DK_DCB_L;
5323 DirectiveKindMap[".dcb.s"] = DK_DCB_S;
5324 DirectiveKindMap[".dcb.w"] = DK_DCB_W;
5325 DirectiveKindMap[".dcb.x"] = DK_DCB_X;
5326 DirectiveKindMap[".ds"] = DK_DS;
5327 DirectiveKindMap[".ds.b"] = DK_DS_B;
5328 DirectiveKindMap[".ds.d"] = DK_DS_D;
5329 DirectiveKindMap[".ds.l"] = DK_DS_L;
5330 DirectiveKindMap[".ds.p"] = DK_DS_P;
5331 DirectiveKindMap[".ds.s"] = DK_DS_S;
5332 DirectiveKindMap[".ds.w"] = DK_DS_W;
5333 DirectiveKindMap[".ds.x"] = DK_DS_X;
5334 DirectiveKindMap[".print"] = DK_PRINT;
5335 DirectiveKindMap[".addrsig"] = DK_ADDRSIG;
5336 DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM;
5337}
5338
5339MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
5340 AsmToken EndToken, StartToken = getTok();
5341
5342 unsigned NestLevel = 0;
5343 while (true) {
5344 // Check whether we have reached the end of the file.
5345 if (getLexer().is(AsmToken::Eof)) {
5346 printError(DirectiveLoc, "no matching '.endr' in definition");
5347 return nullptr;
5348 }
5349
5350 if (Lexer.is(AsmToken::Identifier) &&
5351 (getTok().getIdentifier() == ".rep" ||
5352 getTok().getIdentifier() == ".rept" ||
5353 getTok().getIdentifier() == ".irp" ||
5354 getTok().getIdentifier() == ".irpc")) {
5355 ++NestLevel;
5356 }
5357
5358 // Otherwise, check whether we have reached the .endr.
5359 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
5360 if (NestLevel == 0) {
5361 EndToken = getTok();
5362 Lex();
5363 if (Lexer.isNot(AsmToken::EndOfStatement)) {
5364 printError(getTok().getLoc(),
5365 "unexpected token in '.endr' directive");
5366 return nullptr;
5367 }
5368 break;
5369 }
5370 --NestLevel;
5371 }
5372
5373 // Otherwise, scan till the end of the statement.
5374 eatToEndOfStatement();
5375 }
5376
5377 const char *BodyStart = StartToken.getLoc().getPointer();
5378 const char *BodyEnd = EndToken.getLoc().getPointer();
5379 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
5380
5381 // We Are Anonymous.
5382 MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters());
5383 return &MacroLikeBodies.back();
5384}
5385
5386void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
5387 raw_svector_ostream &OS) {
5388 OS << ".endr\n";
5389
5390 std::unique_ptr<MemoryBuffer> Instantiation =
5391 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
5392
5393 // Create the macro instantiation object and add to the current macro
5394 // instantiation stack.
5395 MacroInstantiation *MI = new MacroInstantiation(
5396 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
5397 ActiveMacros.push_back(MI);
5398
5399 // Jump to the macro instantiation and prime the lexer.
5400 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
5401 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
5402 Lex();
5403}
5404
5405/// parseDirectiveRept
5406/// ::= .rep | .rept count
5407bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) {
5408 const MCExpr *CountExpr;
5409 SMLoc CountLoc = getTok().getLoc();
5410 if (parseExpression(CountExpr))
5411 return true;
5412
5413 int64_t Count;
5414 if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) {
5415 return Error(CountLoc, "unexpected token in '" + Dir + "' directive");
5416 }
5417
5418 if (check(Count < 0, CountLoc, "Count is negative") ||
5419 parseToken(AsmToken::EndOfStatement,
5420 "unexpected token in '" + Dir + "' directive"))
5421 return true;
5422
5423 // Lex the rept definition.
5424 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5425 if (!M)
5426 return true;
5427
5428 // Macro instantiation is lexical, unfortunately. We construct a new buffer
5429 // to hold the macro body with substitutions.
5430 SmallString<256> Buf;
5431 raw_svector_ostream OS(Buf);
5432 while (Count--) {
5433 // Note that the AtPseudoVariable is disabled for instantiations of .rep(t).
5434 if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc()))
5435 return true;
5436 }
5437 instantiateMacroLikeBody(M, DirectiveLoc, OS);
5438
5439 return false;
5440}
5441
5442/// parseDirectiveIrp
5443/// ::= .irp symbol,values
5444bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
5445 MCAsmMacroParameter Parameter;
5446 MCAsmMacroArguments A;
5447 if (check(parseIdentifier(Parameter.Name),
5448 "expected identifier in '.irp' directive") ||
5449 parseToken(AsmToken::Comma, "expected comma in '.irp' directive") ||
5450 parseMacroArguments(nullptr, A) ||
5451 parseToken(AsmToken::EndOfStatement, "expected End of Statement"))
5452 return true;
5453
5454 // Lex the irp definition.
5455 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5456 if (!M)
5457 return true;
5458
5459 // Macro instantiation is lexical, unfortunately. We construct a new buffer
5460 // to hold the macro body with substitutions.
5461 SmallString<256> Buf;
5462 raw_svector_ostream OS(Buf);
5463
5464 for (const MCAsmMacroArgument &Arg : A) {
5465 // Note that the AtPseudoVariable is enabled for instantiations of .irp.
5466 // This is undocumented, but GAS seems to support it.
5467 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
5468 return true;
5469 }
5470
5471 instantiateMacroLikeBody(M, DirectiveLoc, OS);
5472
5473 return false;
5474}
5475
5476/// parseDirectiveIrpc
5477/// ::= .irpc symbol,values
5478bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
5479 MCAsmMacroParameter Parameter;
5480 MCAsmMacroArguments A;
5481
5482 if (check(parseIdentifier(Parameter.Name),
5483 "expected identifier in '.irpc' directive") ||
5484 parseToken(AsmToken::Comma, "expected comma in '.irpc' directive") ||
5485 parseMacroArguments(nullptr, A))
5486 return true;
5487
5488 if (A.size() != 1 || A.front().size() != 1)
5489 return TokError("unexpected token in '.irpc' directive");
5490
5491 // Eat the end of statement.
5492 if (parseToken(AsmToken::EndOfStatement, "expected end of statement"))
5493 return true;
5494
5495 // Lex the irpc definition.
5496 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5497 if (!M)
5498 return true;
5499
5500 // Macro instantiation is lexical, unfortunately. We construct a new buffer
5501 // to hold the macro body with substitutions.
5502 SmallString<256> Buf;
5503 raw_svector_ostream OS(Buf);
5504
5505 StringRef Values = A.front().front().getString();
5506 for (std::size_t I = 0, End = Values.size(); I != End; ++I) {
5507 MCAsmMacroArgument Arg;
5508 Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1));
5509
5510 // Note that the AtPseudoVariable is enabled for instantiations of .irpc.
5511 // This is undocumented, but GAS seems to support it.
5512 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
5513 return true;
5514 }
5515
5516 instantiateMacroLikeBody(M, DirectiveLoc, OS);
5517
5518 return false;
5519}
5520
5521bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
5522 if (ActiveMacros.empty())
5523 return TokError("unmatched '.endr' directive");
5524
5525 // The only .repl that should get here are the ones created by
5526 // instantiateMacroLikeBody.
5527 assert(getLexer().is(AsmToken::EndOfStatement))((getLexer().is(AsmToken::EndOfStatement)) ? static_cast<void
> (0) : __assert_fail ("getLexer().is(AsmToken::EndOfStatement)"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5527, __PRETTY_FUNCTION__))
;
5528
5529 handleMacroExit();
5530 return false;
5531}
5532
5533bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
5534 size_t Len) {
5535 const MCExpr *Value;
5536 SMLoc ExprLoc = getLexer().getLoc();
5537 if (parseExpression(Value))
5538 return true;
5539 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
5540 if (!MCE)
5541 return Error(ExprLoc, "unexpected expression in _emit");
5542 uint64_t IntValue = MCE->getValue();
5543 if (!isUInt<8>(IntValue) && !isInt<8>(IntValue))
5544 return Error(ExprLoc, "literal value out of range for directive");
5545
5546 Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len);
5547 return false;
5548}
5549
5550bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
5551 const MCExpr *Value;
5552 SMLoc ExprLoc = getLexer().getLoc();
5553 if (parseExpression(Value))
5554 return true;
5555 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
5556 if (!MCE)
5557 return Error(ExprLoc, "unexpected expression in align");
5558 uint64_t IntValue = MCE->getValue();
5559 if (!isPowerOf2_64(IntValue))
5560 return Error(ExprLoc, "literal value not a power of two greater then zero");
5561
5562 Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue));
5563 return false;
5564}
5565
5566bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) {
5567 const AsmToken StrTok = getTok();
5568 Lex();
5569 if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"')
5570 return Error(DirectiveLoc, "expected double quoted string after .print");
5571 if (parseToken(AsmToken::EndOfStatement, "expected end of statement"))
5572 return true;
5573 llvm::outs() << StrTok.getStringContents() << '\n';
5574 return false;
5575}
5576
5577bool AsmParser::parseDirectiveAddrsig() {
5578 getStreamer().EmitAddrsig();
5579 return false;
5580}
5581
5582bool AsmParser::parseDirectiveAddrsigSym() {
5583 StringRef Name;
5584 if (check(parseIdentifier(Name),
5585 "expected identifier in '.addrsig_sym' directive"))
5586 return true;
5587 MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
5588 getStreamer().EmitAddrsigSym(Sym);
5589 return false;
5590}
5591
5592// We are comparing pointers, but the pointers are relative to a single string.
5593// Thus, this should always be deterministic.
5594static int rewritesSort(const AsmRewrite *AsmRewriteA,
5595 const AsmRewrite *AsmRewriteB) {
5596 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
5597 return -1;
5598 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
5599 return 1;
5600
5601 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
5602 // rewrite to the same location. Make sure the SizeDirective rewrite is
5603 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
5604 // ensures the sort algorithm is stable.
5605 if (AsmRewritePrecedence[AsmRewriteA->Kind] >
5606 AsmRewritePrecedence[AsmRewriteB->Kind])
5607 return -1;
5608
5609 if (AsmRewritePrecedence[AsmRewriteA->Kind] <
5610 AsmRewritePrecedence[AsmRewriteB->Kind])
5611 return 1;
5612 llvm_unreachable("Unstable rewrite sort.")::llvm::llvm_unreachable_internal("Unstable rewrite sort.", "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5612)
;
5613}
5614
5615bool AsmParser::parseMSInlineAsm(
5616 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
5617 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
5618 SmallVectorImpl<std::string> &Constraints,
5619 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
5620 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
5621 SmallVector<void *, 4> InputDecls;
5622 SmallVector<void *, 4> OutputDecls;
5623 SmallVector<bool, 4> InputDeclsAddressOf;
5624 SmallVector<bool, 4> OutputDeclsAddressOf;
5625 SmallVector<std::string, 4> InputConstraints;
5626 SmallVector<std::string, 4> OutputConstraints;
5627 SmallVector<unsigned, 4> ClobberRegs;
5628
5629 SmallVector<AsmRewrite, 4> AsmStrRewrites;
5630
5631 // Prime the lexer.
5632 Lex();
5633
5634 // While we have input, parse each statement.
5635 unsigned InputIdx = 0;
5636 unsigned OutputIdx = 0;
5637 while (getLexer().isNot(AsmToken::Eof)) {
5638 // Parse curly braces marking block start/end
5639 if (parseCurlyBlockScope(AsmStrRewrites))
5640 continue;
5641
5642 ParseStatementInfo Info(&AsmStrRewrites);
5643 bool StatementErr = parseStatement(Info, &SI);
5644
5645 if (StatementErr || Info.ParseError) {
5646 // Emit pending errors if any exist.
5647 printPendingErrors();
5648 return true;
5649 }
5650
5651 // No pending error should exist here.
5652 assert(!hasPendingError() && "unexpected error from parseStatement")((!hasPendingError() && "unexpected error from parseStatement"
) ? static_cast<void> (0) : __assert_fail ("!hasPendingError() && \"unexpected error from parseStatement\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5652, __PRETTY_FUNCTION__))
;
5653
5654 if (Info.Opcode == ~0U)
5655 continue;
5656
5657 const MCInstrDesc &Desc = MII->get(Info.Opcode);
5658
5659 // Build the list of clobbers, outputs and inputs.
5660 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
5661 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i];
5662
5663 // Immediate.
5664 if (Operand.isImm())
5665 continue;
5666
5667 // Register operand.
5668 if (Operand.isReg() && !Operand.needAddressOf() &&
5669 !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) {
5670 unsigned NumDefs = Desc.getNumDefs();
5671 // Clobber.
5672 if (NumDefs && Operand.getMCOperandNum() < NumDefs)
5673 ClobberRegs.push_back(Operand.getReg());
5674 continue;
5675 }
5676
5677 // Expr/Input or Output.
5678 StringRef SymName = Operand.getSymName();
5679 if (SymName.empty())
5680 continue;
5681
5682 void *OpDecl = Operand.getOpDecl();
5683 if (!OpDecl)
5684 continue;
5685
5686 bool isOutput = (i == 1) && Desc.mayStore();
5687 SMLoc Start = SMLoc::getFromPointer(SymName.data());
5688 if (isOutput) {
5689 ++InputIdx;
5690 OutputDecls.push_back(OpDecl);
5691 OutputDeclsAddressOf.push_back(Operand.needAddressOf());
5692 OutputConstraints.push_back(("=" + Operand.getConstraint()).str());
5693 AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size());
5694 } else {
5695 InputDecls.push_back(OpDecl);
5696 InputDeclsAddressOf.push_back(Operand.needAddressOf());
5697 InputConstraints.push_back(Operand.getConstraint().str());
5698 AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size());
5699 }
5700 }
5701
5702 // Consider implicit defs to be clobbers. Think of cpuid and push.
5703 ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(),
5704 Desc.getNumImplicitDefs());
5705 ClobberRegs.insert(ClobberRegs.end(), ImpDefs.begin(), ImpDefs.end());
5706 }
5707
5708 // Set the number of Outputs and Inputs.
5709 NumOutputs = OutputDecls.size();
5710 NumInputs = InputDecls.size();
5711
5712 // Set the unique clobbers.
5713 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
5714 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
5715 ClobberRegs.end());
5716 Clobbers.assign(ClobberRegs.size(), std::string());
5717 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
5718 raw_string_ostream OS(Clobbers[I]);
5719 IP->printRegName(OS, ClobberRegs[I]);
5720 }
5721
5722 // Merge the various outputs and inputs. Output are expected first.
5723 if (NumOutputs || NumInputs) {
5724 unsigned NumExprs = NumOutputs + NumInputs;
5725 OpDecls.resize(NumExprs);
5726 Constraints.resize(NumExprs);
5727 for (unsigned i = 0; i < NumOutputs; ++i) {
5728 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
5729 Constraints[i] = OutputConstraints[i];
5730 }
5731 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
5732 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
5733 Constraints[j] = InputConstraints[i];
5734 }
5735 }
5736
5737 // Build the IR assembly string.
5738 std::string AsmStringIR;
5739 raw_string_ostream OS(AsmStringIR);
5740 StringRef ASMString =
5741 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer();
5742 const char *AsmStart = ASMString.begin();
5743 const char *AsmEnd = ASMString.end();
5744 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
5745 for (const AsmRewrite &AR : AsmStrRewrites) {
5746 AsmRewriteKind Kind = AR.Kind;
5747
5748 const char *Loc = AR.Loc.getPointer();
5749 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!")((Loc >= AsmStart && "Expected Loc to be at or after Start!"
) ? static_cast<void> (0) : __assert_fail ("Loc >= AsmStart && \"Expected Loc to be at or after Start!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5749, __PRETTY_FUNCTION__))
;
5750
5751 // Emit everything up to the immediate/expression.
5752 if (unsigned Len = Loc - AsmStart)
5753 OS << StringRef(AsmStart, Len);
5754
5755 // Skip the original expression.
5756 if (Kind == AOK_Skip) {
5757 AsmStart = Loc + AR.Len;
5758 continue;
5759 }
5760
5761 unsigned AdditionalSkip = 0;
5762 // Rewrite expressions in $N notation.
5763 switch (Kind) {
5764 default:
5765 break;
5766 case AOK_IntelExpr:
5767 assert(AR.IntelExp.isValid() && "cannot write invalid intel expression")((AR.IntelExp.isValid() && "cannot write invalid intel expression"
) ? static_cast<void> (0) : __assert_fail ("AR.IntelExp.isValid() && \"cannot write invalid intel expression\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5767, __PRETTY_FUNCTION__))
;
5768 if (AR.IntelExp.NeedBracs)
5769 OS << "[";
5770 if (AR.IntelExp.hasBaseReg())
5771 OS << AR.IntelExp.BaseReg;
5772 if (AR.IntelExp.hasIndexReg())
5773 OS << (AR.IntelExp.hasBaseReg() ? " + " : "")
5774 << AR.IntelExp.IndexReg;
5775 if (AR.IntelExp.Scale > 1)
5776 OS << " * $$" << AR.IntelExp.Scale;
5777 if (AR.IntelExp.Imm || !AR.IntelExp.hasRegs())
5778 OS << (AR.IntelExp.hasRegs() ? " + $$" : "$$") << AR.IntelExp.Imm;
5779 if (AR.IntelExp.NeedBracs)
5780 OS << "]";
5781 break;
5782 case AOK_Label:
5783 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label;
5784 break;
5785 case AOK_Input:
5786 OS << '$' << InputIdx++;
5787 break;
5788 case AOK_Output:
5789 OS << '$' << OutputIdx++;
5790 break;
5791 case AOK_SizeDirective:
5792 switch (AR.Val) {
5793 default: break;
5794 case 8: OS << "byte ptr "; break;
5795 case 16: OS << "word ptr "; break;
5796 case 32: OS << "dword ptr "; break;
5797 case 64: OS << "qword ptr "; break;
5798 case 80: OS << "xword ptr "; break;
5799 case 128: OS << "xmmword ptr "; break;
5800 case 256: OS << "ymmword ptr "; break;
5801 }
5802 break;
5803 case AOK_Emit:
5804 OS << ".byte";
5805 break;
5806 case AOK_Align: {
5807 // MS alignment directives are measured in bytes. If the native assembler
5808 // measures alignment in bytes, we can pass it straight through.
5809 OS << ".align";
5810 if (getContext().getAsmInfo()->getAlignmentIsInBytes())
5811 break;
5812
5813 // Alignment is in log2 form, so print that instead and skip the original
5814 // immediate.
5815 unsigned Val = AR.Val;
5816 OS << ' ' << Val;
5817 assert(Val < 10 && "Expected alignment less then 2^10.")((Val < 10 && "Expected alignment less then 2^10."
) ? static_cast<void> (0) : __assert_fail ("Val < 10 && \"Expected alignment less then 2^10.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5817, __PRETTY_FUNCTION__))
;
5818 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
5819 break;
5820 }
5821 case AOK_EVEN:
5822 OS << ".even";
5823 break;
5824 case AOK_EndOfStatement:
5825 OS << "\n\t";
5826 break;
5827 }
5828
5829 // Skip the original expression.
5830 AsmStart = Loc + AR.Len + AdditionalSkip;
5831 }
5832
5833 // Emit the remainder of the asm string.
5834 if (AsmStart != AsmEnd)
5835 OS << StringRef(AsmStart, AsmEnd - AsmStart);
5836
5837 AsmString = OS.str();
5838 return false;
5839}
5840
5841namespace llvm {
5842namespace MCParserUtils {
5843
5844/// Returns whether the given symbol is used anywhere in the given expression,
5845/// or subexpressions.
5846static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) {
5847 switch (Value->getKind()) {
5848 case MCExpr::Binary: {
5849 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
5850 return isSymbolUsedInExpression(Sym, BE->getLHS()) ||
5851 isSymbolUsedInExpression(Sym, BE->getRHS());
5852 }
5853 case MCExpr::Target:
5854 case MCExpr::Constant:
5855 return false;
5856 case MCExpr::SymbolRef: {
5857 const MCSymbol &S =
5858 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
5859 if (S.isVariable())
5860 return isSymbolUsedInExpression(Sym, S.getVariableValue());
5861 return &S == Sym;
5862 }
5863 case MCExpr::Unary:
5864 return isSymbolUsedInExpression(
5865 Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
5866 }
5867
5868 llvm_unreachable("Unknown expr kind!")::llvm::llvm_unreachable_internal("Unknown expr kind!", "/build/llvm-toolchain-snapshot-8~svn345461/lib/MC/MCParser/AsmParser.cpp"
, 5868)
;
5869}
5870
5871bool parseAssignmentExpression(StringRef Name, bool allow_redef,
5872 MCAsmParser &Parser, MCSymbol *&Sym,
5873 const MCExpr *&Value) {
5874
5875 // FIXME: Use better location, we should use proper tokens.
5876 SMLoc EqualLoc = Parser.getTok().getLoc();
5877 if (Parser.parseExpression(Value))
5878 return Parser.TokError("missing expression");
5879
5880 // Note: we don't count b as used in "a = b". This is to allow
5881 // a = b
5882 // b = c
5883
5884 if (Parser.parseToken(AsmToken::EndOfStatement))
5885 return true;
5886
5887 // Validate that the LHS is allowed to be a variable (either it has not been
5888 // used as a symbol, or it is an absolute symbol).
5889 Sym = Parser.getContext().lookupSymbol(Name);
5890 if (Sym) {
5891 // Diagnose assignment to a label.
5892 //
5893 // FIXME: Diagnostics. Note the location of the definition as a label.
5894 // FIXME: Diagnose assignment to protected identifier (e.g., register name).
5895 if (isSymbolUsedInExpression(Sym, Value))
5896 return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'");
5897 else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() &&
5898 !Sym->isVariable())
5899 ; // Allow redefinitions of undefined symbols only used in directives.
5900 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
5901 ; // Allow redefinitions of variables that haven't yet been used.
5902 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
5903 return Parser.Error(EqualLoc, "redefinition of '" + Name + "'");
5904 else if (!Sym->isVariable())
5905 return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'");
5906 else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
5907 return Parser.Error(EqualLoc,
5908 "invalid reassignment of non-absolute variable '" +
5909 Name + "'");
5910 } else if (Name == ".") {
5911 Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc);
5912 return false;
5913 } else
5914 Sym = Parser.getContext().getOrCreateSymbol(Name);
5915
5916 Sym->setRedefinable(allow_redef);
5917
5918 return false;
5919}
5920
5921} // end namespace MCParserUtils
5922} // end namespace llvm
5923
5924/// Create an MCAsmParser instance.
5925MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
5926 MCStreamer &Out, const MCAsmInfo &MAI,
5927 unsigned CB) {
5928 return new AsmParser(SM, C, Out, MAI, CB);
5929}