clang  10.0.0svn
SemaStmtAsm.cpp
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1 //===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements semantic analysis for inline asm statements.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/ExprCXX.h"
14 #include "clang/AST/RecordLayout.h"
15 #include "clang/AST/TypeLoc.h"
16 #include "clang/Basic/TargetInfo.h"
17 #include "clang/Lex/Preprocessor.h"
19 #include "clang/Sema/Lookup.h"
20 #include "clang/Sema/Scope.h"
21 #include "clang/Sema/ScopeInfo.h"
23 #include "llvm/ADT/ArrayRef.h"
24 #include "llvm/ADT/StringSet.h"
25 #include "llvm/MC/MCParser/MCAsmParser.h"
26 using namespace clang;
27 using namespace sema;
28 
29 /// Remove the upper-level LValueToRValue cast from an expression.
30 static void removeLValueToRValueCast(Expr *E) {
31  Expr *Parent = E;
32  Expr *ExprUnderCast = nullptr;
33  SmallVector<Expr *, 8> ParentsToUpdate;
34 
35  while (true) {
36  ParentsToUpdate.push_back(Parent);
37  if (auto *ParenE = dyn_cast<ParenExpr>(Parent)) {
38  Parent = ParenE->getSubExpr();
39  continue;
40  }
41 
42  Expr *Child = nullptr;
43  CastExpr *ParentCast = dyn_cast<CastExpr>(Parent);
44  if (ParentCast)
45  Child = ParentCast->getSubExpr();
46  else
47  return;
48 
49  if (auto *CastE = dyn_cast<CastExpr>(Child))
50  if (CastE->getCastKind() == CK_LValueToRValue) {
51  ExprUnderCast = CastE->getSubExpr();
52  // LValueToRValue cast inside GCCAsmStmt requires an explicit cast.
53  ParentCast->setSubExpr(ExprUnderCast);
54  break;
55  }
56  Parent = Child;
57  }
58 
59  // Update parent expressions to have same ValueType as the underlying.
60  assert(ExprUnderCast &&
61  "Should be reachable only if LValueToRValue cast was found!");
62  auto ValueKind = ExprUnderCast->getValueKind();
63  for (Expr *E : ParentsToUpdate)
64  E->setValueKind(ValueKind);
65 }
66 
67 /// Emit a warning about usage of "noop"-like casts for lvalues (GNU extension)
68 /// and fix the argument with removing LValueToRValue cast from the expression.
69 static void emitAndFixInvalidAsmCastLValue(const Expr *LVal, Expr *BadArgument,
70  Sema &S) {
71  if (!S.getLangOpts().HeinousExtensions) {
72  S.Diag(LVal->getBeginLoc(), diag::err_invalid_asm_cast_lvalue)
73  << BadArgument->getSourceRange();
74  } else {
75  S.Diag(LVal->getBeginLoc(), diag::warn_invalid_asm_cast_lvalue)
76  << BadArgument->getSourceRange();
77  }
78  removeLValueToRValueCast(BadArgument);
79 }
80 
81 /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently
82 /// ignore "noop" casts in places where an lvalue is required by an inline asm.
83 /// We emulate this behavior when -fheinous-gnu-extensions is specified, but
84 /// provide a strong guidance to not use it.
85 ///
86 /// This method checks to see if the argument is an acceptable l-value and
87 /// returns false if it is a case we can handle.
88 static bool CheckAsmLValue(Expr *E, Sema &S) {
89  // Type dependent expressions will be checked during instantiation.
90  if (E->isTypeDependent())
91  return false;
92 
93  if (E->isLValue())
94  return false; // Cool, this is an lvalue.
95 
96  // Okay, this is not an lvalue, but perhaps it is the result of a cast that we
97  // are supposed to allow.
98  const Expr *E2 = E->IgnoreParenNoopCasts(S.Context);
99  if (E != E2 && E2->isLValue()) {
101  // Accept, even if we emitted an error diagnostic.
102  return false;
103  }
104 
105  // None of the above, just randomly invalid non-lvalue.
106  return true;
107 }
108 
109 /// isOperandMentioned - Return true if the specified operand # is mentioned
110 /// anywhere in the decomposed asm string.
111 static bool
112 isOperandMentioned(unsigned OpNo,
114  for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) {
115  const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p];
116  if (!Piece.isOperand())
117  continue;
118 
119  // If this is a reference to the input and if the input was the smaller
120  // one, then we have to reject this asm.
121  if (Piece.getOperandNo() == OpNo)
122  return true;
123  }
124  return false;
125 }
126 
127 static bool CheckNakedParmReference(Expr *E, Sema &S) {
128  FunctionDecl *Func = dyn_cast<FunctionDecl>(S.CurContext);
129  if (!Func)
130  return false;
131  if (!Func->hasAttr<NakedAttr>())
132  return false;
133 
134  SmallVector<Expr*, 4> WorkList;
135  WorkList.push_back(E);
136  while (WorkList.size()) {
137  Expr *E = WorkList.pop_back_val();
138  if (isa<CXXThisExpr>(E)) {
139  S.Diag(E->getBeginLoc(), diag::err_asm_naked_this_ref);
140  S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
141  return true;
142  }
143  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
144  if (isa<ParmVarDecl>(DRE->getDecl())) {
145  S.Diag(DRE->getBeginLoc(), diag::err_asm_naked_parm_ref);
146  S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
147  return true;
148  }
149  }
150  for (Stmt *Child : E->children()) {
151  if (Expr *E = dyn_cast_or_null<Expr>(Child))
152  WorkList.push_back(E);
153  }
154  }
155  return false;
156 }
157 
158 /// Returns true if given expression is not compatible with inline
159 /// assembly's memory constraint; false otherwise.
162  bool is_input_expr) {
163  enum {
164  ExprBitfield = 0,
165  ExprVectorElt,
166  ExprGlobalRegVar,
167  ExprSafeType
168  } EType = ExprSafeType;
169 
170  // Bitfields, vector elements and global register variables are not
171  // compatible.
172  if (E->refersToBitField())
173  EType = ExprBitfield;
174  else if (E->refersToVectorElement())
175  EType = ExprVectorElt;
176  else if (E->refersToGlobalRegisterVar())
177  EType = ExprGlobalRegVar;
178 
179  if (EType != ExprSafeType) {
180  S.Diag(E->getBeginLoc(), diag::err_asm_non_addr_value_in_memory_constraint)
181  << EType << is_input_expr << Info.getConstraintStr()
182  << E->getSourceRange();
183  return true;
184  }
185 
186  return false;
187 }
188 
189 // Extracting the register name from the Expression value,
190 // if there is no register name to extract, returns ""
191 static StringRef extractRegisterName(const Expr *Expression,
192  const TargetInfo &Target) {
193  Expression = Expression->IgnoreImpCasts();
194  if (const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(Expression)) {
195  // Handle cases where the expression is a variable
196  const VarDecl *Variable = dyn_cast<VarDecl>(AsmDeclRef->getDecl());
197  if (Variable && Variable->getStorageClass() == SC_Register) {
198  if (AsmLabelAttr *Attr = Variable->getAttr<AsmLabelAttr>())
199  if (Target.isValidGCCRegisterName(Attr->getLabel()))
200  return Target.getNormalizedGCCRegisterName(Attr->getLabel(), true);
201  }
202  }
203  return "";
204 }
205 
206 // Checks if there is a conflict between the input and output lists with the
207 // clobbers list. If there's a conflict, returns the location of the
208 // conflicted clobber, else returns nullptr
209 static SourceLocation
211  StringLiteral **Clobbers, int NumClobbers,
212  unsigned NumLabels,
213  const TargetInfo &Target, ASTContext &Cont) {
214  llvm::StringSet<> InOutVars;
215  // Collect all the input and output registers from the extended asm
216  // statement in order to check for conflicts with the clobber list
217  for (unsigned int i = 0; i < Exprs.size() - NumLabels; ++i) {
218  StringRef Constraint = Constraints[i]->getString();
219  StringRef InOutReg = Target.getConstraintRegister(
220  Constraint, extractRegisterName(Exprs[i], Target));
221  if (InOutReg != "")
222  InOutVars.insert(InOutReg);
223  }
224  // Check for each item in the clobber list if it conflicts with the input
225  // or output
226  for (int i = 0; i < NumClobbers; ++i) {
227  StringRef Clobber = Clobbers[i]->getString();
228  // We only check registers, therefore we don't check cc and memory
229  // clobbers
230  if (Clobber == "cc" || Clobber == "memory")
231  continue;
232  Clobber = Target.getNormalizedGCCRegisterName(Clobber, true);
233  // Go over the output's registers we collected
234  if (InOutVars.count(Clobber))
235  return Clobbers[i]->getBeginLoc();
236  }
237  return SourceLocation();
238 }
239 
241  bool IsVolatile, unsigned NumOutputs,
242  unsigned NumInputs, IdentifierInfo **Names,
243  MultiExprArg constraints, MultiExprArg Exprs,
244  Expr *asmString, MultiExprArg clobbers,
245  unsigned NumLabels,
246  SourceLocation RParenLoc) {
247  unsigned NumClobbers = clobbers.size();
248  StringLiteral **Constraints =
249  reinterpret_cast<StringLiteral**>(constraints.data());
250  StringLiteral *AsmString = cast<StringLiteral>(asmString);
251  StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
252 
253  SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
254 
255  // The parser verifies that there is a string literal here.
256  assert(AsmString->isAscii());
257 
258  for (unsigned i = 0; i != NumOutputs; i++) {
259  StringLiteral *Literal = Constraints[i];
260  assert(Literal->isAscii());
261 
262  StringRef OutputName;
263  if (Names[i])
264  OutputName = Names[i]->getName();
265 
266  TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
267  if (!Context.getTargetInfo().validateOutputConstraint(Info)) {
268  targetDiag(Literal->getBeginLoc(),
269  diag::err_asm_invalid_output_constraint)
270  << Info.getConstraintStr();
271  return new (Context)
272  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
273  NumInputs, Names, Constraints, Exprs.data(), AsmString,
274  NumClobbers, Clobbers, NumLabels, RParenLoc);
275  }
276 
277  ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
278  if (ER.isInvalid())
279  return StmtError();
280  Exprs[i] = ER.get();
281 
282  // Check that the output exprs are valid lvalues.
283  Expr *OutputExpr = Exprs[i];
284 
285  // Referring to parameters is not allowed in naked functions.
286  if (CheckNakedParmReference(OutputExpr, *this))
287  return StmtError();
288 
289  // Check that the output expression is compatible with memory constraint.
290  if (Info.allowsMemory() &&
291  checkExprMemoryConstraintCompat(*this, OutputExpr, Info, false))
292  return StmtError();
293 
294  OutputConstraintInfos.push_back(Info);
295 
296  // If this is dependent, just continue.
297  if (OutputExpr->isTypeDependent())
298  continue;
299 
301  OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
302  switch (IsLV) {
303  case Expr::MLV_Valid:
304  // Cool, this is an lvalue.
305  break;
306  case Expr::MLV_ArrayType:
307  // This is OK too.
308  break;
309  case Expr::MLV_LValueCast: {
310  const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
311  emitAndFixInvalidAsmCastLValue(LVal, OutputExpr, *this);
312  // Accept, even if we emitted an error diagnostic.
313  break;
314  }
317  if (RequireCompleteType(OutputExpr->getBeginLoc(), Exprs[i]->getType(),
318  diag::err_dereference_incomplete_type))
319  return StmtError();
320  LLVM_FALLTHROUGH;
321  default:
322  return StmtError(Diag(OutputExpr->getBeginLoc(),
323  diag::err_asm_invalid_lvalue_in_output)
324  << OutputExpr->getSourceRange());
325  }
326 
327  unsigned Size = Context.getTypeSize(OutputExpr->getType());
328  if (!Context.getTargetInfo().validateOutputSize(Literal->getString(),
329  Size)) {
330  targetDiag(OutputExpr->getBeginLoc(), diag::err_asm_invalid_output_size)
331  << Info.getConstraintStr();
332  return new (Context)
333  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
334  NumInputs, Names, Constraints, Exprs.data(), AsmString,
335  NumClobbers, Clobbers, NumLabels, RParenLoc);
336  }
337  }
338 
339  SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
340 
341  for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
342  StringLiteral *Literal = Constraints[i];
343  assert(Literal->isAscii());
344 
345  StringRef InputName;
346  if (Names[i])
347  InputName = Names[i]->getName();
348 
349  TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
350  if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
351  Info)) {
352  targetDiag(Literal->getBeginLoc(), diag::err_asm_invalid_input_constraint)
353  << Info.getConstraintStr();
354  return new (Context)
355  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
356  NumInputs, Names, Constraints, Exprs.data(), AsmString,
357  NumClobbers, Clobbers, NumLabels, RParenLoc);
358  }
359 
360  ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
361  if (ER.isInvalid())
362  return StmtError();
363  Exprs[i] = ER.get();
364 
365  Expr *InputExpr = Exprs[i];
366 
367  // Referring to parameters is not allowed in naked functions.
368  if (CheckNakedParmReference(InputExpr, *this))
369  return StmtError();
370 
371  // Check that the input expression is compatible with memory constraint.
372  if (Info.allowsMemory() &&
373  checkExprMemoryConstraintCompat(*this, InputExpr, Info, true))
374  return StmtError();
375 
376  // Only allow void types for memory constraints.
377  if (Info.allowsMemory() && !Info.allowsRegister()) {
378  if (CheckAsmLValue(InputExpr, *this))
379  return StmtError(Diag(InputExpr->getBeginLoc(),
380  diag::err_asm_invalid_lvalue_in_input)
381  << Info.getConstraintStr()
382  << InputExpr->getSourceRange());
383  } else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
384  if (!InputExpr->isValueDependent()) {
385  Expr::EvalResult EVResult;
386  if (InputExpr->EvaluateAsRValue(EVResult, Context, true)) {
387  // For compatibility with GCC, we also allow pointers that would be
388  // integral constant expressions if they were cast to int.
389  llvm::APSInt IntResult;
390  if (EVResult.Val.toIntegralConstant(IntResult, InputExpr->getType(),
391  Context))
392  if (!Info.isValidAsmImmediate(IntResult))
393  return StmtError(Diag(InputExpr->getBeginLoc(),
394  diag::err_invalid_asm_value_for_constraint)
395  << IntResult.toString(10)
396  << Info.getConstraintStr()
397  << InputExpr->getSourceRange());
398  }
399  }
400 
401  } else {
402  ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
403  if (Result.isInvalid())
404  return StmtError();
405 
406  Exprs[i] = Result.get();
407  }
408 
409  if (Info.allowsRegister()) {
410  if (InputExpr->getType()->isVoidType()) {
411  return StmtError(
412  Diag(InputExpr->getBeginLoc(), diag::err_asm_invalid_type_in_input)
413  << InputExpr->getType() << Info.getConstraintStr()
414  << InputExpr->getSourceRange());
415  }
416  }
417 
418  InputConstraintInfos.push_back(Info);
419 
420  const Type *Ty = Exprs[i]->getType().getTypePtr();
421  if (Ty->isDependentType())
422  continue;
423 
424  if (!Ty->isVoidType() || !Info.allowsMemory())
425  if (RequireCompleteType(InputExpr->getBeginLoc(), Exprs[i]->getType(),
426  diag::err_dereference_incomplete_type))
427  return StmtError();
428 
429  unsigned Size = Context.getTypeSize(Ty);
430  if (!Context.getTargetInfo().validateInputSize(Literal->getString(),
431  Size))
432  return StmtResult(
433  targetDiag(InputExpr->getBeginLoc(), diag::err_asm_invalid_input_size)
434  << Info.getConstraintStr());
435  }
436 
437  // Check that the clobbers are valid.
438  for (unsigned i = 0; i != NumClobbers; i++) {
439  StringLiteral *Literal = Clobbers[i];
440  assert(Literal->isAscii());
441 
442  StringRef Clobber = Literal->getString();
443 
444  if (!Context.getTargetInfo().isValidClobber(Clobber)) {
445  targetDiag(Literal->getBeginLoc(), diag::err_asm_unknown_register_name)
446  << Clobber;
447  return new (Context)
448  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
449  NumInputs, Names, Constraints, Exprs.data(), AsmString,
450  NumClobbers, Clobbers, NumLabels, RParenLoc);
451  }
452  }
453 
454  GCCAsmStmt *NS =
455  new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
456  NumInputs, Names, Constraints, Exprs.data(),
457  AsmString, NumClobbers, Clobbers, NumLabels,
458  RParenLoc);
459  // Validate the asm string, ensuring it makes sense given the operands we
460  // have.
462  unsigned DiagOffs;
463  if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
464  targetDiag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
465  << AsmString->getSourceRange();
466  return NS;
467  }
468 
469  // Validate constraints and modifiers.
470  for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
471  GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
472  if (!Piece.isOperand()) continue;
473 
474  // Look for the correct constraint index.
475  unsigned ConstraintIdx = Piece.getOperandNo();
476  // Labels are the last in the Exprs list.
477  if (NS->isAsmGoto() && ConstraintIdx >= NS->getNumInputs())
478  continue;
479  unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
480  // Look for the (ConstraintIdx - NumOperands + 1)th constraint with
481  // modifier '+'.
482  if (ConstraintIdx >= NumOperands) {
483  unsigned I = 0, E = NS->getNumOutputs();
484 
485  for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
486  if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
487  ConstraintIdx = I;
488  break;
489  }
490 
491  assert(I != E && "Invalid operand number should have been caught in "
492  " AnalyzeAsmString");
493  }
494 
495  // Now that we have the right indexes go ahead and check.
496  StringLiteral *Literal = Constraints[ConstraintIdx];
497  const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
498  if (Ty->isDependentType() || Ty->isIncompleteType())
499  continue;
500 
501  unsigned Size = Context.getTypeSize(Ty);
502  std::string SuggestedModifier;
504  Literal->getString(), Piece.getModifier(), Size,
505  SuggestedModifier)) {
506  targetDiag(Exprs[ConstraintIdx]->getBeginLoc(),
507  diag::warn_asm_mismatched_size_modifier);
508 
509  if (!SuggestedModifier.empty()) {
510  auto B = targetDiag(Piece.getRange().getBegin(),
511  diag::note_asm_missing_constraint_modifier)
512  << SuggestedModifier;
513  SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
514  B << FixItHint::CreateReplacement(Piece.getRange(), SuggestedModifier);
515  }
516  }
517  }
518 
519  // Validate tied input operands for type mismatches.
520  unsigned NumAlternatives = ~0U;
521  for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
522  TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
523  StringRef ConstraintStr = Info.getConstraintStr();
524  unsigned AltCount = ConstraintStr.count(',') + 1;
525  if (NumAlternatives == ~0U) {
526  NumAlternatives = AltCount;
527  } else if (NumAlternatives != AltCount) {
528  targetDiag(NS->getOutputExpr(i)->getBeginLoc(),
529  diag::err_asm_unexpected_constraint_alternatives)
530  << NumAlternatives << AltCount;
531  return NS;
532  }
533  }
534  SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
535  ~0U);
536  for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
537  TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
538  StringRef ConstraintStr = Info.getConstraintStr();
539  unsigned AltCount = ConstraintStr.count(',') + 1;
540  if (NumAlternatives == ~0U) {
541  NumAlternatives = AltCount;
542  } else if (NumAlternatives != AltCount) {
543  targetDiag(NS->getInputExpr(i)->getBeginLoc(),
544  diag::err_asm_unexpected_constraint_alternatives)
545  << NumAlternatives << AltCount;
546  return NS;
547  }
548 
549  // If this is a tied constraint, verify that the output and input have
550  // either exactly the same type, or that they are int/ptr operands with the
551  // same size (int/long, int*/long, are ok etc).
552  if (!Info.hasTiedOperand()) continue;
553 
554  unsigned TiedTo = Info.getTiedOperand();
555  unsigned InputOpNo = i+NumOutputs;
556  Expr *OutputExpr = Exprs[TiedTo];
557  Expr *InputExpr = Exprs[InputOpNo];
558 
559  // Make sure no more than one input constraint matches each output.
560  assert(TiedTo < InputMatchedToOutput.size() && "TiedTo value out of range");
561  if (InputMatchedToOutput[TiedTo] != ~0U) {
562  targetDiag(NS->getInputExpr(i)->getBeginLoc(),
563  diag::err_asm_input_duplicate_match)
564  << TiedTo;
565  targetDiag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getBeginLoc(),
566  diag::note_asm_input_duplicate_first)
567  << TiedTo;
568  return NS;
569  }
570  InputMatchedToOutput[TiedTo] = i;
571 
572  if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
573  continue;
574 
575  QualType InTy = InputExpr->getType();
576  QualType OutTy = OutputExpr->getType();
577  if (Context.hasSameType(InTy, OutTy))
578  continue; // All types can be tied to themselves.
579 
580  // Decide if the input and output are in the same domain (integer/ptr or
581  // floating point.
582  enum AsmDomain {
583  AD_Int, AD_FP, AD_Other
584  } InputDomain, OutputDomain;
585 
586  if (InTy->isIntegerType() || InTy->isPointerType())
587  InputDomain = AD_Int;
588  else if (InTy->isRealFloatingType())
589  InputDomain = AD_FP;
590  else
591  InputDomain = AD_Other;
592 
593  if (OutTy->isIntegerType() || OutTy->isPointerType())
594  OutputDomain = AD_Int;
595  else if (OutTy->isRealFloatingType())
596  OutputDomain = AD_FP;
597  else
598  OutputDomain = AD_Other;
599 
600  // They are ok if they are the same size and in the same domain. This
601  // allows tying things like:
602  // void* to int*
603  // void* to int if they are the same size.
604  // double to long double if they are the same size.
605  //
606  uint64_t OutSize = Context.getTypeSize(OutTy);
607  uint64_t InSize = Context.getTypeSize(InTy);
608  if (OutSize == InSize && InputDomain == OutputDomain &&
609  InputDomain != AD_Other)
610  continue;
611 
612  // If the smaller input/output operand is not mentioned in the asm string,
613  // then we can promote the smaller one to a larger input and the asm string
614  // won't notice.
615  bool SmallerValueMentioned = false;
616 
617  // If this is a reference to the input and if the input was the smaller
618  // one, then we have to reject this asm.
619  if (isOperandMentioned(InputOpNo, Pieces)) {
620  // This is a use in the asm string of the smaller operand. Since we
621  // codegen this by promoting to a wider value, the asm will get printed
622  // "wrong".
623  SmallerValueMentioned |= InSize < OutSize;
624  }
625  if (isOperandMentioned(TiedTo, Pieces)) {
626  // If this is a reference to the output, and if the output is the larger
627  // value, then it's ok because we'll promote the input to the larger type.
628  SmallerValueMentioned |= OutSize < InSize;
629  }
630 
631  // If the smaller value wasn't mentioned in the asm string, and if the
632  // output was a register, just extend the shorter one to the size of the
633  // larger one.
634  if (!SmallerValueMentioned && InputDomain != AD_Other &&
635  OutputConstraintInfos[TiedTo].allowsRegister())
636  continue;
637 
638  // Either both of the operands were mentioned or the smaller one was
639  // mentioned. One more special case that we'll allow: if the tied input is
640  // integer, unmentioned, and is a constant, then we'll allow truncating it
641  // down to the size of the destination.
642  if (InputDomain == AD_Int && OutputDomain == AD_Int &&
643  !isOperandMentioned(InputOpNo, Pieces) &&
644  InputExpr->isEvaluatable(Context)) {
645  CastKind castKind =
646  (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
647  InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
648  Exprs[InputOpNo] = InputExpr;
649  NS->setInputExpr(i, InputExpr);
650  continue;
651  }
652 
653  targetDiag(InputExpr->getBeginLoc(), diag::err_asm_tying_incompatible_types)
654  << InTy << OutTy << OutputExpr->getSourceRange()
655  << InputExpr->getSourceRange();
656  return NS;
657  }
658 
659  // Check for conflicts between clobber list and input or output lists
660  SourceLocation ConstraintLoc =
661  getClobberConflictLocation(Exprs, Constraints, Clobbers, NumClobbers,
662  NumLabels,
663  Context.getTargetInfo(), Context);
664  if (ConstraintLoc.isValid())
665  targetDiag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber);
666 
667  // Check for duplicate asm operand name between input, output and label lists.
668  typedef std::pair<StringRef , Expr *> NamedOperand;
669  SmallVector<NamedOperand, 4> NamedOperandList;
670  for (unsigned i = 0, e = NumOutputs + NumInputs + NumLabels; i != e; ++i)
671  if (Names[i])
672  NamedOperandList.emplace_back(
673  std::make_pair(Names[i]->getName(), Exprs[i]));
674  // Sort NamedOperandList.
675  std::stable_sort(NamedOperandList.begin(), NamedOperandList.end(),
676  [](const NamedOperand &LHS, const NamedOperand &RHS) {
677  return LHS.first < RHS.first;
678  });
679  // Find adjacent duplicate operand.
681  std::adjacent_find(begin(NamedOperandList), end(NamedOperandList),
682  [](const NamedOperand &LHS, const NamedOperand &RHS) {
683  return LHS.first == RHS.first;
684  });
685  if (Found != NamedOperandList.end()) {
686  Diag((Found + 1)->second->getBeginLoc(),
687  diag::error_duplicate_asm_operand_name)
688  << (Found + 1)->first;
689  Diag(Found->second->getBeginLoc(), diag::note_duplicate_asm_operand_name)
690  << Found->first;
691  return StmtError();
692  }
693  if (NS->isAsmGoto())
694  setFunctionHasBranchIntoScope();
695  return NS;
696 }
697 
699  llvm::InlineAsmIdentifierInfo &Info) {
700  QualType T = Res->getType();
701  Expr::EvalResult Eval;
702  if (T->isFunctionType() || T->isDependentType())
703  return Info.setLabel(Res);
704  if (Res->isRValue()) {
705  if (isa<clang::EnumType>(T) && Res->EvaluateAsRValue(Eval, Context))
706  return Info.setEnum(Eval.Val.getInt().getSExtValue());
707  return Info.setLabel(Res);
708  }
709  unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
710  unsigned Type = Size;
711  if (const auto *ATy = Context.getAsArrayType(T))
712  Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
713  bool IsGlobalLV = false;
714  if (Res->EvaluateAsLValue(Eval, Context))
715  IsGlobalLV = Eval.isGlobalLValue();
716  Info.setVar(Res, IsGlobalLV, Size, Type);
717 }
718 
720  SourceLocation TemplateKWLoc,
721  UnqualifiedId &Id,
722  bool IsUnevaluatedContext) {
723 
724  if (IsUnevaluatedContext)
725  PushExpressionEvaluationContext(
726  ExpressionEvaluationContext::UnevaluatedAbstract,
727  ReuseLambdaContextDecl);
728 
729  ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
730  /*trailing lparen*/ false,
731  /*is & operand*/ false,
732  /*CorrectionCandidateCallback=*/nullptr,
733  /*IsInlineAsmIdentifier=*/ true);
734 
735  if (IsUnevaluatedContext)
736  PopExpressionEvaluationContext();
737 
738  if (!Result.isUsable()) return Result;
739 
740  Result = CheckPlaceholderExpr(Result.get());
741  if (!Result.isUsable()) return Result;
742 
743  // Referring to parameters is not allowed in naked functions.
744  if (CheckNakedParmReference(Result.get(), *this))
745  return ExprError();
746 
747  QualType T = Result.get()->getType();
748 
749  if (T->isDependentType()) {
750  return Result;
751  }
752 
753  // Any sort of function type is fine.
754  if (T->isFunctionType()) {
755  return Result;
756  }
757 
758  // Otherwise, it needs to be a complete type.
759  if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
760  return ExprError();
761  }
762 
763  return Result;
764 }
765 
766 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
767  unsigned &Offset, SourceLocation AsmLoc) {
768  Offset = 0;
770  Member.split(Members, ".");
771 
772  NamedDecl *FoundDecl = nullptr;
773 
774  // MS InlineAsm uses 'this' as a base
775  if (getLangOpts().CPlusPlus && Base.equals("this")) {
776  if (const Type *PT = getCurrentThisType().getTypePtrOrNull())
777  FoundDecl = PT->getPointeeType()->getAsTagDecl();
778  } else {
779  LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
780  LookupOrdinaryName);
781  if (LookupName(BaseResult, getCurScope()) && BaseResult.isSingleResult())
782  FoundDecl = BaseResult.getFoundDecl();
783  }
784 
785  if (!FoundDecl)
786  return true;
787 
788  for (StringRef NextMember : Members) {
789  const RecordType *RT = nullptr;
790  if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
791  RT = VD->getType()->getAs<RecordType>();
792  else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
793  MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
794  // MS InlineAsm often uses struct pointer aliases as a base
795  QualType QT = TD->getUnderlyingType();
796  if (const auto *PT = QT->getAs<PointerType>())
797  QT = PT->getPointeeType();
798  RT = QT->getAs<RecordType>();
799  } else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
800  RT = TD->getTypeForDecl()->getAs<RecordType>();
801  else if (FieldDecl *TD = dyn_cast<FieldDecl>(FoundDecl))
802  RT = TD->getType()->getAs<RecordType>();
803  if (!RT)
804  return true;
805 
806  if (RequireCompleteType(AsmLoc, QualType(RT, 0),
807  diag::err_asm_incomplete_type))
808  return true;
809 
810  LookupResult FieldResult(*this, &Context.Idents.get(NextMember),
811  SourceLocation(), LookupMemberName);
812 
813  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
814  return true;
815 
816  if (!FieldResult.isSingleResult())
817  return true;
818  FoundDecl = FieldResult.getFoundDecl();
819 
820  // FIXME: Handle IndirectFieldDecl?
821  FieldDecl *FD = dyn_cast<FieldDecl>(FoundDecl);
822  if (!FD)
823  return true;
824 
825  const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
826  unsigned i = FD->getFieldIndex();
827  CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
828  Offset += (unsigned)Result.getQuantity();
829  }
830 
831  return false;
832 }
833 
836  SourceLocation AsmLoc) {
837 
838  QualType T = E->getType();
839  if (T->isDependentType()) {
840  DeclarationNameInfo NameInfo;
841  NameInfo.setLoc(AsmLoc);
842  NameInfo.setName(&Context.Idents.get(Member));
844  Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
845  SourceLocation(),
846  /*FirstQualifierFoundInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
847  }
848 
849  const RecordType *RT = T->getAs<RecordType>();
850  // FIXME: Diagnose this as field access into a scalar type.
851  if (!RT)
852  return ExprResult();
853 
854  LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
855  LookupMemberName);
856 
857  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
858  return ExprResult();
859 
860  // Only normal and indirect field results will work.
861  ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
862  if (!FD)
863  FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
864  if (!FD)
865  return ExprResult();
866 
867  // Make an Expr to thread through OpDecl.
868  ExprResult Result = BuildMemberReferenceExpr(
869  E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
870  SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
871 
872  return Result;
873 }
874 
876  ArrayRef<Token> AsmToks,
877  StringRef AsmString,
878  unsigned NumOutputs, unsigned NumInputs,
879  ArrayRef<StringRef> Constraints,
880  ArrayRef<StringRef> Clobbers,
881  ArrayRef<Expr*> Exprs,
882  SourceLocation EndLoc) {
883  bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
884  setFunctionHasBranchProtectedScope();
885  MSAsmStmt *NS =
886  new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
887  /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
888  Constraints, Exprs, AsmString,
889  Clobbers, EndLoc);
890  return NS;
891 }
892 
893 LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
894  SourceLocation Location,
895  bool AlwaysCreate) {
896  LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
897  Location);
898 
899  if (Label->isMSAsmLabel()) {
900  // If we have previously created this label implicitly, mark it as used.
901  Label->markUsed(Context);
902  } else {
903  // Otherwise, insert it, but only resolve it if we have seen the label itself.
904  std::string InternalName;
905  llvm::raw_string_ostream OS(InternalName);
906  // Create an internal name for the label. The name should not be a valid
907  // mangled name, and should be unique. We use a dot to make the name an
908  // invalid mangled name. We use LLVM's inline asm ${:uid} escape so that a
909  // unique label is generated each time this blob is emitted, even after
910  // inlining or LTO.
911  OS << "__MSASMLABEL_.${:uid}__";
912  for (char C : ExternalLabelName) {
913  OS << C;
914  // We escape '$' in asm strings by replacing it with "$$"
915  if (C == '$')
916  OS << '$';
917  }
918  Label->setMSAsmLabel(OS.str());
919  }
920  if (AlwaysCreate) {
921  // The label might have been created implicitly from a previously encountered
922  // goto statement. So, for both newly created and looked up labels, we mark
923  // them as resolved.
924  Label->setMSAsmLabelResolved();
925  }
926  // Adjust their location for being able to generate accurate diagnostics.
927  Label->setLocation(Location);
928 
929  return Label;
930 }
This represents a GCC inline-assembly statement extension.
Definition: Stmt.h:2862
Represents a function declaration or definition.
Definition: Decl.h:1784
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.
unsigned getNumInputs() const
Definition: Stmt.h:2774
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2585
A (possibly-)qualified type.
Definition: Type.h:643
void FillInlineAsmIdentifierInfo(Expr *Res, llvm::InlineAsmIdentifierInfo &Info)
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D...
Stmt - This represents one statement.
Definition: Stmt.h:66
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:557
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:2024
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:1034
unsigned getNumOutputs() const
Definition: Stmt.h:2752
bool isAscii() const
Definition: Expr.h:1805
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1375
unsigned getFieldIndex() const
Returns the index of this field within its record, as appropriate for passing to ASTRecordLayout::get...
Definition: Decl.cpp:3992
static void emitAndFixInvalidAsmCastLValue(const Expr *LVal, Expr *BadArgument, Sema &S)
Emit a warning about usage of "noop"-like casts for lvalues (GNU extension) and fix the argument with...
Definition: SemaStmtAsm.cpp:69
The base class of the type hierarchy.
Definition: Type.h:1436
bool validateInputConstraint(MutableArrayRef< ConstraintInfo > OutputConstraints, ConstraintInfo &info) const
Definition: TargetInfo.cpp:640
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:706
isModifiableLvalueResult
Definition: Expr.h:278
void setInputExpr(unsigned i, Expr *E)
Definition: Stmt.cpp:454
Represents a variable declaration or definition.
Definition: Decl.h:827
ActionResult< Stmt * > StmtResult
Definition: Ownership.h:264
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6858
unsigned AnalyzeAsmString(SmallVectorImpl< AsmStringPiece > &Pieces, const ASTContext &C, unsigned &DiagOffs) const
AnalyzeAsmString - Analyze the asm string of the current asm, decomposing it into pieces...
Definition: Stmt.cpp:534
Defines the clang::Expr interface and subclasses for C++ expressions.
static bool checkExprMemoryConstraintCompat(Sema &S, Expr *E, TargetInfo::ConstraintInfo &Info, bool is_input_expr)
Returns true if given expression is not compatible with inline assembly&#39;s memory constraint; false ot...
One of these records is kept for each identifier that is lexed.
SourceLocation getBegin() const
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:160
A C++ nested-name-specifier augmented with source location information.
StringRef getNormalizedGCCRegisterName(StringRef Name, bool ReturnCanonical=false) const
Returns the "normalized" GCC register name.
Definition: TargetInfo.cpp:502
virtual bool validateConstraintModifier(StringRef, char, unsigned, std::string &) const
Definition: TargetInfo.h:957
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:274
Represents a member of a struct/union/class.
Definition: Decl.h:2643
CharSourceRange getRange() const
Definition: Stmt.h:2929
void setName(DeclarationName N)
setName - Sets the embedded declaration name.
bool isAsmGoto() const
Definition: Stmt.h:3007
Expr * getSubExpr()
Definition: Expr.h:3177
static bool isOperandMentioned(unsigned OpNo, ArrayRef< GCCAsmStmt::AsmStringPiece > AsmStrPieces)
isOperandMentioned - Return true if the specified operand # is mentioned anywhere in the decomposed a...
IdentifierTable & Idents
Definition: ASTContext.h:579
LabelDecl * GetOrCreateMSAsmLabel(StringRef ExternalLabelName, SourceLocation Location, bool AlwaysCreate)
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:944
Represents the results of name lookup.
Definition: Lookup.h:46
PtrTy get() const
Definition: Ownership.h:170
bool refersToBitField() const
Returns true if this expression is a gl-value that potentially refers to a bit-field.
Definition: Expr.h:446
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
APValue Val
Val - This is the value the expression can be folded to.
Definition: Expr.h:582
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:414
child_range children()
Definition: Stmt.cpp:223
StmtResult StmtError()
Definition: Ownership.h:280
Represents a declaration of a type.
Definition: Decl.h:2943
virtual StringRef getConstraintRegister(StringRef Constraint, StringRef Expression) const
Extracts a register from the passed constraint (if it is a single-register constraint) and the asm la...
Definition: TargetInfo.h:824
Expr * getOutputExpr(unsigned i)
Definition: Stmt.cpp:439
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3125
const LangOptions & getLangOpts() const
Definition: Sema.h:1288
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:176
virtual bool isValidGCCRegisterName(StringRef Name) const
Returns whether the passed in string is a valid register name according to GCC.
Definition: TargetInfo.cpp:457
Expr * IgnoreImpCasts() LLVM_READONLY
Skip past any implicit casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2950
NodeId Parent
Definition: ASTDiff.cpp:191
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Id, bool IsUnevaluatedContext)
bool hasAttr() const
Definition: DeclBase.h:542
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:331
StringRef getString() const
Definition: Expr.h:1769
bool isValidClobber(StringRef Name) const
Returns whether the passed in string is a valid clobber in an inline asm statement.
Definition: TargetInfo.cpp:449
CastKind
CastKind - The kind of operation required for a conversion.
bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsLValue - Evaluate an expression to see if we can fold it to an lvalue with link time known ...
unsigned getOperandNo() const
Definition: Stmt.h:2924
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
static bool CheckNakedParmReference(Expr *E, Sema &S)
unsigned Offset
Definition: Format.cpp:1809
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:38
Exposes information about the current target.
Definition: TargetInfo.h:163
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:644
This represents one expression.
Definition: Expr.h:108
std::string Label
int Id
Definition: ASTDiff.cpp:190
AsmStringPiece - this is part of a decomposed asm string specification (for use with the AnalyzeAsmSt...
Definition: Stmt.h:2897
Defines the clang::Preprocessor interface.
static CXXDependentScopeMemberExpr * Create(const ASTContext &Ctx, Expr *Base, QualType BaseType, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs)
Definition: ExprCXX.cpp:1445
Defines the clang::TypeLoc interface and its subclasses.
QualType getType() const
Definition: Expr.h:137
void setValueKind(ExprValueKind Cat)
setValueKind - Set the value kind produced by this expression.
Definition: Expr.h:431
ActionResult< CXXBaseSpecifier * > BaseResult
Definition: Ownership.h:266
This represents a Microsoft inline-assembly statement extension.
Definition: Stmt.h:3085
bool isInvalid() const
Definition: Ownership.h:166
void setLocation(SourceLocation L)
Definition: DeclBase.h:430
bool isUsable() const
Definition: Ownership.h:167
RecordDecl * getDecl() const
Definition: Type.h:4454
uint64_t getFieldOffset(unsigned FieldNo) const
getFieldOffset - Get the offset of the given field index, in bits.
Definition: RecordLayout.h:190
bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsRValue - Return true if this is a constant which we can fold to an rvalue using any crazy t...
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
Encodes a location in the source.
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
static StringRef extractRegisterName(const Expr *Expression, const TargetInfo &Target)
llvm::APSInt APSInt
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member, SourceLocation AsmLoc)
StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple, bool IsVolatile, unsigned NumOutputs, unsigned NumInputs, IdentifierInfo **Names, MultiExprArg Constraints, MultiExprArg Exprs, Expr *AsmString, MultiExprArg Clobbers, unsigned NumLabels, SourceLocation RParenLoc)
Represents the declaration of a label.
Definition: Decl.h:476
static void removeLValueToRValueCast(Expr *E)
Remove the upper-level LValueToRValue cast from an expression.
Definition: SemaStmtAsm.cpp:30
const std::string & getString() const
Definition: Stmt.h:2922
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
bool validateOutputConstraint(ConstraintInfo &Info) const
Definition: TargetInfo.cpp:543
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:158
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1861
bool isMSAsmLabel() const
Definition: Decl.h:510
bool LookupInlineAsmField(StringRef Base, StringRef Member, unsigned &Offset, SourceLocation AsmLoc)
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language...
Definition: Expr.h:258
isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc=nullptr) const
isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, does not have an incomplet...
bool refersToVectorElement() const
Returns whether this expression refers to a vector element.
Definition: Expr.cpp:3888
Expr * getInputExpr(unsigned i)
Definition: Stmt.cpp:450
StringRef getName() const
Return the actual identifier string.
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2985
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:580
static std::string getName(const CallEvent &Call)
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)
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2894
void setSubExpr(Expr *E)
Definition: Expr.h:3179
bool isBooleanType() const
Definition: Type.h:6767
char getModifier() const
getModifier - Get the modifier for this operand, if present.
Definition: Stmt.cpp:430
bool hasTiedOperand() const
Return true if this input operand is a matching constraint that ties it to an output operand...
Definition: TargetInfo.h:874
bool toIntegralConstant(APSInt &Result, QualType SrcTy, const ASTContext &Ctx) const
Try to convert this value to an integral constant.
Definition: APValue.cpp:713
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
const std::string & getConstraintStr() const
Definition: TargetInfo.h:858
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4444
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6684
T * getAttr() const
Definition: DeclBase.h:538
bool isFunctionType() const
Definition: Type.h:6387
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2305
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:413
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2088
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:2118
void setLoc(SourceLocation L)
setLoc - Sets the main location of the declaration name.
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
bool refersToGlobalRegisterVar() const
Returns whether this expression refers to a global register variable.
Definition: Expr.cpp:3914
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
virtual bool validateOutputSize(StringRef, unsigned) const
Definition: TargetInfo.h:947
bool isVoidType() const
Definition: Type.h:6650
static bool CheckAsmLValue(Expr *E, Sema &S)
CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently ignore "noop" casts in p...
Definition: SemaStmtAsm.cpp:88
void setMSAsmLabel(StringRef Name)
Definition: Decl.cpp:4584
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:389
bool isRValue() const
Definition: Expr.h:259
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:129
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:262
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1686
Defines the clang::TargetInfo interface.
ExprResult ExprError()
Definition: Ownership.h:279
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2121
bool isEvaluatable(const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
isEvaluatable - Call EvaluateAsRValue to see if this expression can be constant folded without side-e...
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1146
bool isPointerType() const
Definition: Type.h:6391
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
void setMSAsmLabelResolved()
Definition: Decl.h:514
virtual bool validateInputSize(StringRef, unsigned) const
Definition: TargetInfo.h:952
ASTContext & Context
Definition: Sema.h:377
This represents a decl that may have a name.
Definition: Decl.h:248
APSInt & getInt()
Definition: APValue.h:380
Expr * IgnoreParenNoopCasts(const ASTContext &Ctx) LLVM_READONLY
Skip past any parenthese and casts which do not change the value (including ptr->int casts of the sam...
Definition: Expr.cpp:2993
static SourceLocation getClobberConflictLocation(MultiExprArg Exprs, StringLiteral **Constraints, StringLiteral **Clobbers, int NumClobbers, unsigned NumLabels, const TargetInfo &Target, ASTContext &Cont)
Attr - This represents one attribute.
Definition: Attr.h:45