clang  3.7.0
SemaStmtAsm.cpp
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1 //===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===//
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 file implements semantic analysis for inline asm statements.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "clang/AST/ExprCXX.h"
16 #include "clang/AST/RecordLayout.h"
17 #include "clang/AST/TypeLoc.h"
18 #include "clang/Basic/TargetInfo.h"
19 #include "clang/Lex/Preprocessor.h"
21 #include "clang/Sema/Lookup.h"
22 #include "clang/Sema/Scope.h"
23 #include "clang/Sema/ScopeInfo.h"
24 #include "llvm/ADT/ArrayRef.h"
25 #include "llvm/ADT/BitVector.h"
26 #include "llvm/MC/MCParser/MCAsmParser.h"
27 using namespace clang;
28 using namespace sema;
29 
30 /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently
31 /// ignore "noop" casts in places where an lvalue is required by an inline asm.
32 /// We emulate this behavior when -fheinous-gnu-extensions is specified, but
33 /// provide a strong guidance to not use it.
34 ///
35 /// This method checks to see if the argument is an acceptable l-value and
36 /// returns false if it is a case we can handle.
37 static bool CheckAsmLValue(const Expr *E, Sema &S) {
38  // Type dependent expressions will be checked during instantiation.
39  if (E->isTypeDependent())
40  return false;
41 
42  if (E->isLValue())
43  return false; // Cool, this is an lvalue.
44 
45  // Okay, this is not an lvalue, but perhaps it is the result of a cast that we
46  // are supposed to allow.
47  const Expr *E2 = E->IgnoreParenNoopCasts(S.Context);
48  if (E != E2 && E2->isLValue()) {
49  if (!S.getLangOpts().HeinousExtensions)
50  S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue)
51  << E->getSourceRange();
52  else
53  S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
54  << E->getSourceRange();
55  // Accept, even if we emitted an error diagnostic.
56  return false;
57  }
58 
59  // None of the above, just randomly invalid non-lvalue.
60  return true;
61 }
62 
63 /// isOperandMentioned - Return true if the specified operand # is mentioned
64 /// anywhere in the decomposed asm string.
65 static bool isOperandMentioned(unsigned OpNo,
67  for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) {
68  const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p];
69  if (!Piece.isOperand()) continue;
70 
71  // If this is a reference to the input and if the input was the smaller
72  // one, then we have to reject this asm.
73  if (Piece.getOperandNo() == OpNo)
74  return true;
75  }
76  return false;
77 }
78 
79 static bool CheckNakedParmReference(Expr *E, Sema &S) {
80  FunctionDecl *Func = dyn_cast<FunctionDecl>(S.CurContext);
81  if (!Func)
82  return false;
83  if (!Func->hasAttr<NakedAttr>())
84  return false;
85 
86  SmallVector<Expr*, 4> WorkList;
87  WorkList.push_back(E);
88  while (WorkList.size()) {
89  Expr *E = WorkList.pop_back_val();
90  if (isa<CXXThisExpr>(E)) {
91  S.Diag(E->getLocStart(), diag::err_asm_naked_this_ref);
92  S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
93  return true;
94  }
95  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
96  if (isa<ParmVarDecl>(DRE->getDecl())) {
97  S.Diag(DRE->getLocStart(), diag::err_asm_naked_parm_ref);
98  S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
99  return true;
100  }
101  }
102  for (Stmt *Child : E->children()) {
103  if (Expr *E = dyn_cast_or_null<Expr>(Child))
104  WorkList.push_back(E);
105  }
106  }
107  return false;
108 }
109 
111  bool IsVolatile, unsigned NumOutputs,
112  unsigned NumInputs, IdentifierInfo **Names,
113  MultiExprArg constraints, MultiExprArg Exprs,
114  Expr *asmString, MultiExprArg clobbers,
115  SourceLocation RParenLoc) {
116  unsigned NumClobbers = clobbers.size();
117  StringLiteral **Constraints =
118  reinterpret_cast<StringLiteral**>(constraints.data());
119  StringLiteral *AsmString = cast<StringLiteral>(asmString);
120  StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
121 
122  SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
123 
124  // The parser verifies that there is a string literal here.
125  assert(AsmString->isAscii());
126 
127  bool ValidateConstraints =
128  DeclAttrsMatchCUDAMode(getLangOpts(), getCurFunctionDecl());
129 
130  for (unsigned i = 0; i != NumOutputs; i++) {
131  StringLiteral *Literal = Constraints[i];
132  assert(Literal->isAscii());
133 
134  StringRef OutputName;
135  if (Names[i])
136  OutputName = Names[i]->getName();
137 
138  TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
139  if (ValidateConstraints &&
141  return StmtError(Diag(Literal->getLocStart(),
142  diag::err_asm_invalid_output_constraint)
143  << Info.getConstraintStr());
144 
145  ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
146  if (ER.isInvalid())
147  return StmtError();
148  Exprs[i] = ER.get();
149 
150  // Check that the output exprs are valid lvalues.
151  Expr *OutputExpr = Exprs[i];
152 
153  // Referring to parameters is not allowed in naked functions.
154  if (CheckNakedParmReference(OutputExpr, *this))
155  return StmtError();
156 
157  // Bitfield can't be referenced with a pointer.
158  if (Info.allowsMemory() && OutputExpr->refersToBitField())
159  return StmtError(Diag(OutputExpr->getLocStart(),
160  diag::err_asm_bitfield_in_memory_constraint)
161  << 1
162  << Info.getConstraintStr()
163  << OutputExpr->getSourceRange());
164 
165  OutputConstraintInfos.push_back(Info);
166 
167  // If this is dependent, just continue.
168  if (OutputExpr->isTypeDependent())
169  continue;
170 
172  OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
173  switch (IsLV) {
174  case Expr::MLV_Valid:
175  // Cool, this is an lvalue.
176  break;
177  case Expr::MLV_ArrayType:
178  // This is OK too.
179  break;
180  case Expr::MLV_LValueCast: {
181  const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
182  if (!getLangOpts().HeinousExtensions) {
183  Diag(LVal->getLocStart(), diag::err_invalid_asm_cast_lvalue)
184  << OutputExpr->getSourceRange();
185  } else {
186  Diag(LVal->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
187  << OutputExpr->getSourceRange();
188  }
189  // Accept, even if we emitted an error diagnostic.
190  break;
191  }
194  if (RequireCompleteType(OutputExpr->getLocStart(), Exprs[i]->getType(),
195  diag::err_dereference_incomplete_type))
196  return StmtError();
197  default:
198  return StmtError(Diag(OutputExpr->getLocStart(),
199  diag::err_asm_invalid_lvalue_in_output)
200  << OutputExpr->getSourceRange());
201  }
202 
203  unsigned Size = Context.getTypeSize(OutputExpr->getType());
205  Size))
206  return StmtError(Diag(OutputExpr->getLocStart(),
207  diag::err_asm_invalid_output_size)
208  << Info.getConstraintStr());
209  }
210 
211  SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
212 
213  for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
214  StringLiteral *Literal = Constraints[i];
215  assert(Literal->isAscii());
216 
217  StringRef InputName;
218  if (Names[i])
219  InputName = Names[i]->getName();
220 
221  TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
222  if (ValidateConstraints &&
224  OutputConstraintInfos.data(), NumOutputs, Info)) {
225  return StmtError(Diag(Literal->getLocStart(),
226  diag::err_asm_invalid_input_constraint)
227  << Info.getConstraintStr());
228  }
229 
230  ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
231  if (ER.isInvalid())
232  return StmtError();
233  Exprs[i] = ER.get();
234 
235  Expr *InputExpr = Exprs[i];
236 
237  // Referring to parameters is not allowed in naked functions.
238  if (CheckNakedParmReference(InputExpr, *this))
239  return StmtError();
240 
241  // Bitfield can't be referenced with a pointer.
242  if (Info.allowsMemory() && InputExpr->refersToBitField())
243  return StmtError(Diag(InputExpr->getLocStart(),
244  diag::err_asm_bitfield_in_memory_constraint)
245  << 0
246  << Info.getConstraintStr()
247  << InputExpr->getSourceRange());
248 
249  // Only allow void types for memory constraints.
250  if (Info.allowsMemory() && !Info.allowsRegister()) {
251  if (CheckAsmLValue(InputExpr, *this))
252  return StmtError(Diag(InputExpr->getLocStart(),
253  diag::err_asm_invalid_lvalue_in_input)
254  << Info.getConstraintStr()
255  << InputExpr->getSourceRange());
256  } else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
257  if (!InputExpr->isValueDependent()) {
258  llvm::APSInt Result;
259  if (!InputExpr->EvaluateAsInt(Result, Context))
260  return StmtError(
261  Diag(InputExpr->getLocStart(), diag::err_asm_immediate_expected)
262  << Info.getConstraintStr() << InputExpr->getSourceRange());
263  if (Result.slt(Info.getImmConstantMin()) ||
264  Result.sgt(Info.getImmConstantMax()))
265  return StmtError(Diag(InputExpr->getLocStart(),
266  diag::err_invalid_asm_value_for_constraint)
267  << Result.toString(10) << Info.getConstraintStr()
268  << InputExpr->getSourceRange());
269  }
270 
271  } else {
272  ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
273  if (Result.isInvalid())
274  return StmtError();
275 
276  Exprs[i] = Result.get();
277  }
278 
279  if (Info.allowsRegister()) {
280  if (InputExpr->getType()->isVoidType()) {
281  return StmtError(Diag(InputExpr->getLocStart(),
282  diag::err_asm_invalid_type_in_input)
283  << InputExpr->getType() << Info.getConstraintStr()
284  << InputExpr->getSourceRange());
285  }
286  }
287 
288  InputConstraintInfos.push_back(Info);
289 
290  const Type *Ty = Exprs[i]->getType().getTypePtr();
291  if (Ty->isDependentType())
292  continue;
293 
294  if (!Ty->isVoidType() || !Info.allowsMemory())
295  if (RequireCompleteType(InputExpr->getLocStart(), Exprs[i]->getType(),
296  diag::err_dereference_incomplete_type))
297  return StmtError();
298 
299  unsigned Size = Context.getTypeSize(Ty);
301  Size))
302  return StmtError(Diag(InputExpr->getLocStart(),
303  diag::err_asm_invalid_input_size)
304  << Info.getConstraintStr());
305  }
306 
307  // Check that the clobbers are valid.
308  for (unsigned i = 0; i != NumClobbers; i++) {
309  StringLiteral *Literal = Clobbers[i];
310  assert(Literal->isAscii());
311 
312  StringRef Clobber = Literal->getString();
313 
314  if (!Context.getTargetInfo().isValidClobber(Clobber))
315  return StmtError(Diag(Literal->getLocStart(),
316  diag::err_asm_unknown_register_name) << Clobber);
317  }
318 
319  GCCAsmStmt *NS =
320  new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
321  NumInputs, Names, Constraints, Exprs.data(),
322  AsmString, NumClobbers, Clobbers, RParenLoc);
323  // Validate the asm string, ensuring it makes sense given the operands we
324  // have.
326  unsigned DiagOffs;
327  if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
328  Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
329  << AsmString->getSourceRange();
330  return StmtError();
331  }
332 
333  // Validate constraints and modifiers.
334  for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
335  GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
336  if (!Piece.isOperand()) continue;
337 
338  // Look for the correct constraint index.
339  unsigned ConstraintIdx = Piece.getOperandNo();
340  unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
341 
342  // Look for the (ConstraintIdx - NumOperands + 1)th constraint with
343  // modifier '+'.
344  if (ConstraintIdx >= NumOperands) {
345  unsigned I = 0, E = NS->getNumOutputs();
346 
347  for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
348  if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
349  ConstraintIdx = I;
350  break;
351  }
352 
353  assert(I != E && "Invalid operand number should have been caught in "
354  " AnalyzeAsmString");
355  }
356 
357  // Now that we have the right indexes go ahead and check.
358  StringLiteral *Literal = Constraints[ConstraintIdx];
359  const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
360  if (Ty->isDependentType() || Ty->isIncompleteType())
361  continue;
362 
363  unsigned Size = Context.getTypeSize(Ty);
364  std::string SuggestedModifier;
366  Literal->getString(), Piece.getModifier(), Size,
367  SuggestedModifier)) {
368  Diag(Exprs[ConstraintIdx]->getLocStart(),
369  diag::warn_asm_mismatched_size_modifier);
370 
371  if (!SuggestedModifier.empty()) {
372  auto B = Diag(Piece.getRange().getBegin(),
373  diag::note_asm_missing_constraint_modifier)
374  << SuggestedModifier;
375  SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
376  B.AddFixItHint(FixItHint::CreateReplacement(Piece.getRange(),
377  SuggestedModifier));
378  }
379  }
380  }
381 
382  // Validate tied input operands for type mismatches.
383  unsigned NumAlternatives = ~0U;
384  for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
385  TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
386  StringRef ConstraintStr = Info.getConstraintStr();
387  unsigned AltCount = ConstraintStr.count(',') + 1;
388  if (NumAlternatives == ~0U)
389  NumAlternatives = AltCount;
390  else if (NumAlternatives != AltCount)
391  return StmtError(Diag(NS->getOutputExpr(i)->getLocStart(),
392  diag::err_asm_unexpected_constraint_alternatives)
393  << NumAlternatives << AltCount);
394  }
395  for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
396  TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
397  StringRef ConstraintStr = Info.getConstraintStr();
398  unsigned AltCount = ConstraintStr.count(',') + 1;
399  if (NumAlternatives == ~0U)
400  NumAlternatives = AltCount;
401  else if (NumAlternatives != AltCount)
402  return StmtError(Diag(NS->getInputExpr(i)->getLocStart(),
403  diag::err_asm_unexpected_constraint_alternatives)
404  << NumAlternatives << AltCount);
405 
406  // If this is a tied constraint, verify that the output and input have
407  // either exactly the same type, or that they are int/ptr operands with the
408  // same size (int/long, int*/long, are ok etc).
409  if (!Info.hasTiedOperand()) continue;
410 
411  unsigned TiedTo = Info.getTiedOperand();
412  unsigned InputOpNo = i+NumOutputs;
413  Expr *OutputExpr = Exprs[TiedTo];
414  Expr *InputExpr = Exprs[InputOpNo];
415 
416  if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
417  continue;
418 
419  QualType InTy = InputExpr->getType();
420  QualType OutTy = OutputExpr->getType();
421  if (Context.hasSameType(InTy, OutTy))
422  continue; // All types can be tied to themselves.
423 
424  // Decide if the input and output are in the same domain (integer/ptr or
425  // floating point.
426  enum AsmDomain {
427  AD_Int, AD_FP, AD_Other
428  } InputDomain, OutputDomain;
429 
430  if (InTy->isIntegerType() || InTy->isPointerType())
431  InputDomain = AD_Int;
432  else if (InTy->isRealFloatingType())
433  InputDomain = AD_FP;
434  else
435  InputDomain = AD_Other;
436 
437  if (OutTy->isIntegerType() || OutTy->isPointerType())
438  OutputDomain = AD_Int;
439  else if (OutTy->isRealFloatingType())
440  OutputDomain = AD_FP;
441  else
442  OutputDomain = AD_Other;
443 
444  // They are ok if they are the same size and in the same domain. This
445  // allows tying things like:
446  // void* to int*
447  // void* to int if they are the same size.
448  // double to long double if they are the same size.
449  //
450  uint64_t OutSize = Context.getTypeSize(OutTy);
451  uint64_t InSize = Context.getTypeSize(InTy);
452  if (OutSize == InSize && InputDomain == OutputDomain &&
453  InputDomain != AD_Other)
454  continue;
455 
456  // If the smaller input/output operand is not mentioned in the asm string,
457  // then we can promote the smaller one to a larger input and the asm string
458  // won't notice.
459  bool SmallerValueMentioned = false;
460 
461  // If this is a reference to the input and if the input was the smaller
462  // one, then we have to reject this asm.
463  if (isOperandMentioned(InputOpNo, Pieces)) {
464  // This is a use in the asm string of the smaller operand. Since we
465  // codegen this by promoting to a wider value, the asm will get printed
466  // "wrong".
467  SmallerValueMentioned |= InSize < OutSize;
468  }
469  if (isOperandMentioned(TiedTo, Pieces)) {
470  // If this is a reference to the output, and if the output is the larger
471  // value, then it's ok because we'll promote the input to the larger type.
472  SmallerValueMentioned |= OutSize < InSize;
473  }
474 
475  // If the smaller value wasn't mentioned in the asm string, and if the
476  // output was a register, just extend the shorter one to the size of the
477  // larger one.
478  if (!SmallerValueMentioned && InputDomain != AD_Other &&
479  OutputConstraintInfos[TiedTo].allowsRegister())
480  continue;
481 
482  // Either both of the operands were mentioned or the smaller one was
483  // mentioned. One more special case that we'll allow: if the tied input is
484  // integer, unmentioned, and is a constant, then we'll allow truncating it
485  // down to the size of the destination.
486  if (InputDomain == AD_Int && OutputDomain == AD_Int &&
487  !isOperandMentioned(InputOpNo, Pieces) &&
488  InputExpr->isEvaluatable(Context)) {
489  CastKind castKind =
491  InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
492  Exprs[InputOpNo] = InputExpr;
493  NS->setInputExpr(i, InputExpr);
494  continue;
495  }
496 
497  Diag(InputExpr->getLocStart(),
498  diag::err_asm_tying_incompatible_types)
499  << InTy << OutTy << OutputExpr->getSourceRange()
500  << InputExpr->getSourceRange();
501  return StmtError();
502  }
503 
504  return NS;
505 }
506 
508  SourceLocation TemplateKWLoc,
509  UnqualifiedId &Id,
510  llvm::InlineAsmIdentifierInfo &Info,
511  bool IsUnevaluatedContext) {
512  Info.clear();
513 
514  if (IsUnevaluatedContext)
515  PushExpressionEvaluationContext(UnevaluatedAbstract,
516  ReuseLambdaContextDecl);
517 
518  ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
519  /*trailing lparen*/ false,
520  /*is & operand*/ false,
521  /*CorrectionCandidateCallback=*/nullptr,
522  /*IsInlineAsmIdentifier=*/ true);
523 
524  if (IsUnevaluatedContext)
525  PopExpressionEvaluationContext();
526 
527  if (!Result.isUsable()) return Result;
528 
529  Result = CheckPlaceholderExpr(Result.get());
530  if (!Result.isUsable()) return Result;
531 
532  // Referring to parameters is not allowed in naked functions.
533  if (CheckNakedParmReference(Result.get(), *this))
534  return ExprError();
535 
536  QualType T = Result.get()->getType();
537 
538  // For now, reject dependent types.
539  if (T->isDependentType()) {
540  Diag(Id.getLocStart(), diag::err_asm_incomplete_type) << T;
541  return ExprError();
542  }
543 
544  // Any sort of function type is fine.
545  if (T->isFunctionType()) {
546  return Result;
547  }
548 
549  // Otherwise, it needs to be a complete type.
550  if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
551  return ExprError();
552  }
553 
554  // Compute the type size (and array length if applicable?).
555  Info.Type = Info.Size = Context.getTypeSizeInChars(T).getQuantity();
556  if (T->isArrayType()) {
557  const ArrayType *ATy = Context.getAsArrayType(T);
558  Info.Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
559  Info.Length = Info.Size / Info.Type;
560  }
561 
562  // We can work with the expression as long as it's not an r-value.
563  if (!Result.get()->isRValue())
564  Info.IsVarDecl = true;
565 
566  return Result;
567 }
568 
569 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
570  unsigned &Offset, SourceLocation AsmLoc) {
571  Offset = 0;
573  LookupOrdinaryName);
574 
575  if (!LookupName(BaseResult, getCurScope()))
576  return true;
577 
578  if (!BaseResult.isSingleResult())
579  return true;
580 
581  const RecordType *RT = nullptr;
582  NamedDecl *FoundDecl = BaseResult.getFoundDecl();
583  if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
584  RT = VD->getType()->getAs<RecordType>();
585  else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
586  MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
587  RT = TD->getUnderlyingType()->getAs<RecordType>();
588  } else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
589  RT = TD->getTypeForDecl()->getAs<RecordType>();
590  if (!RT)
591  return true;
592 
593  if (RequireCompleteType(AsmLoc, QualType(RT, 0), 0))
594  return true;
595 
596  LookupResult FieldResult(*this, &Context.Idents.get(Member), SourceLocation(),
597  LookupMemberName);
598 
599  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
600  return true;
601 
602  // FIXME: Handle IndirectFieldDecl?
603  FieldDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
604  if (!FD)
605  return true;
606 
608  unsigned i = FD->getFieldIndex();
610  Offset = (unsigned)Result.getQuantity();
611 
612  return false;
613 }
614 
616  ArrayRef<Token> AsmToks,
617  StringRef AsmString,
618  unsigned NumOutputs, unsigned NumInputs,
619  ArrayRef<StringRef> Constraints,
620  ArrayRef<StringRef> Clobbers,
621  ArrayRef<Expr*> Exprs,
622  SourceLocation EndLoc) {
623  bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
624  getCurFunction()->setHasBranchProtectedScope();
625  MSAsmStmt *NS =
626  new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
627  /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
628  Constraints, Exprs, AsmString,
629  Clobbers, EndLoc);
630  return NS;
631 }
632 
633 LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
634  SourceLocation Location,
635  bool AlwaysCreate) {
636  LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
637  Location);
638 
639  if (Label->isMSAsmLabel()) {
640  // If we have previously created this label implicitly, mark it as used.
641  Label->markUsed(Context);
642  } else {
643  // Otherwise, insert it, but only resolve it if we have seen the label itself.
644  std::string InternalName;
645  llvm::raw_string_ostream OS(InternalName);
646  // Create an internal name for the label. The name should not be a valid mangled
647  // name, and should be unique. We use a dot to make the name an invalid mangled
648  // name.
649  OS << "__MSASMLABEL_." << MSAsmLabelNameCounter++ << "__" << ExternalLabelName;
650  Label->setMSAsmLabel(OS.str());
651  }
652  if (AlwaysCreate) {
653  // The label might have been created implicitly from a previously encountered
654  // goto statement. So, for both newly created and looked up labels, we mark
655  // them as resolved.
656  Label->setMSAsmLabelResolved();
657  }
658  // Adjust their location for being able to generate accurate diagnostics.
659  Label->setLocation(Location);
660 
661  return Label;
662 }
unsigned getNumOutputs() const
Definition: Stmt.h:1447
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
bool isEvaluatable(const ASTContext &Ctx) const
bool isInvalid() const
Definition: Ownership.h:159
SourceLocation getBegin() const
const LangOptions & getLangOpts() const
Definition: Sema.h:1019
StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple, bool IsVolatile, unsigned NumOutputs, unsigned NumInputs, IdentifierInfo **Names, MultiExprArg Constraints, MultiExprArg Exprs, Expr *AsmString, MultiExprArg Clobbers, SourceLocation RParenLoc)
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:163
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1088
PtrTy get() const
Definition: Ownership.h:163
bool validateOutputConstraint(ConstraintInfo &Info) const
bool isBooleanType() const
Definition: Type.h:5489
SourceLocation getLocStart() const LLVM_READONLY
Definition: Expr.h:1607
isModifiableLvalueResult
Definition: Expr.h:270
void setInputExpr(unsigned i, Expr *E)
Definition: Stmt.cpp:409
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:1701
virtual bool validateConstraintModifier(StringRef, char, unsigned, std::string &) const
Defines the clang::Expr interface and subclasses for C++ expressions.
bool isVoidType() const
Definition: Type.h:5426
unsigned getNumInputs() const
Definition: Stmt.h:1469
bool hasAttr() const
Definition: DeclBase.h:487
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:1871
virtual bool validateOutputSize(StringRef, unsigned) const
static bool isOperandMentioned(unsigned OpNo, ArrayRef< GCCAsmStmt::AsmStringPiece > AsmStrPieces)
Definition: SemaStmtAsm.cpp:65
IdentifierTable & Idents
Definition: ASTContext.h:439
LabelDecl * GetOrCreateMSAsmLabel(StringRef ExternalLabelName, SourceLocation Location, bool AlwaysCreate)
virtual bool validateInputSize(StringRef, unsigned) const
T * getAttr() const
Definition: DeclBase.h:484
Type(TypeClass tc, QualType canon, bool Dependent, bool InstantiationDependent, bool VariablyModified, bool ContainsUnexpandedParameterPack)
Definition: Type.h:1455
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:869
Represents the results of name lookup.
Definition: Lookup.h:30
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:518
uint32_t Offset
Definition: CacheTokens.cpp:43
static bool CheckAsmLValue(const Expr *E, Sema &S)
Definition: SemaStmtAsm.cpp:37
const ArrayType * getAsArrayType(QualType T) const
StmtResult StmtError()
Definition: Ownership.h:268
SourceLocation getLocStart() const LLVM_READONLY
Definition: DeclSpec.h:1075
bool isValueDependent() const
Definition: Expr.h:146
Expr * getOutputExpr(unsigned i)
Definition: Stmt.cpp:395
RecordDecl * getDecl() const
Definition: Type.h:3527
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D...
uint64_t getFieldOffset(unsigned FieldNo) const
Definition: RecordLayout.h:181
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:68
bool isIncompleteType(NamedDecl **Def=nullptr) const
Def If non-NULL, and the type refers to some kind of declaration that can be completed (such as a C s...
Definition: Type.cpp:1869
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:258
Expr * IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY
Definition: Expr.cpp:2559
CastKind
CastKind - The kind of operation required for a conversion.
ASTContext * Context
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Id, llvm::InlineAsmIdentifierInfo &Info, bool IsUnevaluatedContext)
static bool CheckNakedParmReference(Expr *E, Sema &S)
Definition: SemaStmtAsm.cpp:79
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:1776
StringRef getName() const
Return the actual identifier string.
bool isValidClobber(StringRef Name) const
Returns whether the passed in string is a valid clobber in an inline asm statement.
Defines the clang::Preprocessor interface.
bool isMSAsmLabel() const
Definition: Decl.h:388
isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc=nullptr) const
Defines the clang::TypeLoc interface and its subclasses.
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
bool isDependentType() const
Definition: Type.h:1727
bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
void setLocation(SourceLocation L)
Definition: DeclBase.h:373
The result type of a method or function.
Encodes a location in the source. The SourceManager can decode this to get at the full include stack...
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
CharSourceRange getRange() const
Definition: Stmt.h:1617
bool LookupInlineAsmField(StringRef Base, StringRef Member, unsigned &Offset, SourceLocation AsmLoc)
bool isRValue() const
Definition: Expr.h:251
Expr * getInputExpr(unsigned i)
Definition: Stmt.cpp:406
bool isTypeDependent() const
Definition: Expr.h:166
bool isAscii() const
Definition: Expr.h:1564
ActionResult< CXXBaseSpecifier * > BaseResult
Definition: Ownership.h:255
bool refersToBitField() const
Returns true if this expression is a gl-value that potentially refers to a bit-field.
Definition: Expr.h:436
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2576
QualType getType() const
Definition: Expr.h:125
unsigned AnalyzeAsmString(SmallVectorImpl< AsmStringPiece > &Pieces, const ASTContext &C, unsigned &DiagOffs) const
Definition: Stmt.cpp:473
static __inline__ uint32_t volatile uint32_t * p
Definition: arm_acle.h:75
bool hasTiedOperand() const
Return true if this input operand is a matching constraint that ties it to an output operand...
bool isLValue() const
Definition: Expr.h:250
StringRef getString() const
Definition: Expr.h:1521
bool DeclAttrsMatchCUDAMode(const LangOptions &LangOpts, Decl *D)
Definition: SemaInternal.h:54
const T * getAs() const
Definition: Type.h:5555
bool isFunctionType() const
Definition: Type.h:5229
unsigned getOperandNo() const
Definition: Stmt.h:1612
unsigned getFieldIndex() const
Definition: Decl.cpp:3350
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:316
bool isUsable() const
Definition: Ownership.h:160
const std::string & getString() const
Definition: Stmt.h:1608
void setMSAsmLabel(StringRef Name)
Definition: Decl.cpp:3831
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:307
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:115
bool isArrayType() const
Definition: Type.h:5271
Defines the clang::TargetInfo interface.
ExprResult ExprError()
Definition: Ownership.h:267
StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc, ArrayRef< Token > AsmToks, StringRef AsmString, unsigned NumOutputs, unsigned NumInputs, ArrayRef< StringRef > Constraints, ArrayRef< StringRef > Clobbers, ArrayRef< Expr * > Exprs, SourceLocation EndLoc)
bool validateInputConstraint(ConstraintInfo *OutputConstraints, unsigned NumOutputs, ConstraintInfo &info) const
A reference to a declared variable, function, enum, etc. [C99 6.5.1p2].
Definition: Expr.h:899
QualType getElementType() const
Definition: Type.h:2434
void setMSAsmLabelResolved()
Definition: Decl.h:392
ASTContext & Context
Definition: Sema.h:295
bool isIntegerType() const
Definition: Type.h:5448
bool isPointerType() const
Definition: Type.h:5232