clang  9.0.0svn
SemaStmtAsm.cpp
Go to the documentation of this file.
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  const TargetInfo &Target, ASTContext &Cont) {
213  llvm::StringSet<> InOutVars;
214  // Collect all the input and output registers from the extended asm
215  // statement in order to check for conflicts with the clobber list
216  for (unsigned int i = 0; i < Exprs.size(); ++i) {
217  StringRef Constraint = Constraints[i]->getString();
218  StringRef InOutReg = Target.getConstraintRegister(
219  Constraint, extractRegisterName(Exprs[i], Target));
220  if (InOutReg != "")
221  InOutVars.insert(InOutReg);
222  }
223  // Check for each item in the clobber list if it conflicts with the input
224  // or output
225  for (int i = 0; i < NumClobbers; ++i) {
226  StringRef Clobber = Clobbers[i]->getString();
227  // We only check registers, therefore we don't check cc and memory
228  // clobbers
229  if (Clobber == "cc" || Clobber == "memory")
230  continue;
231  Clobber = Target.getNormalizedGCCRegisterName(Clobber, true);
232  // Go over the output's registers we collected
233  if (InOutVars.count(Clobber))
234  return Clobbers[i]->getBeginLoc();
235  }
236  return SourceLocation();
237 }
238 
240  bool IsVolatile, unsigned NumOutputs,
241  unsigned NumInputs, IdentifierInfo **Names,
242  MultiExprArg constraints, MultiExprArg Exprs,
243  Expr *asmString, MultiExprArg clobbers,
244  SourceLocation RParenLoc) {
245  unsigned NumClobbers = clobbers.size();
246  StringLiteral **Constraints =
247  reinterpret_cast<StringLiteral**>(constraints.data());
248  StringLiteral *AsmString = cast<StringLiteral>(asmString);
249  StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
250 
251  SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
252 
253  // The parser verifies that there is a string literal here.
254  assert(AsmString->isAscii());
255 
256  for (unsigned i = 0; i != NumOutputs; i++) {
257  StringLiteral *Literal = Constraints[i];
258  assert(Literal->isAscii());
259 
260  StringRef OutputName;
261  if (Names[i])
262  OutputName = Names[i]->getName();
263 
264  TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
265  if (!Context.getTargetInfo().validateOutputConstraint(Info)) {
266  targetDiag(Literal->getBeginLoc(),
267  diag::err_asm_invalid_output_constraint)
268  << Info.getConstraintStr();
269  return new (Context)
270  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
271  NumInputs, Names, Constraints, Exprs.data(), AsmString,
272  NumClobbers, Clobbers, RParenLoc);
273  }
274 
275  ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
276  if (ER.isInvalid())
277  return StmtError();
278  Exprs[i] = ER.get();
279 
280  // Check that the output exprs are valid lvalues.
281  Expr *OutputExpr = Exprs[i];
282 
283  // Referring to parameters is not allowed in naked functions.
284  if (CheckNakedParmReference(OutputExpr, *this))
285  return StmtError();
286 
287  // Check that the output expression is compatible with memory constraint.
288  if (Info.allowsMemory() &&
289  checkExprMemoryConstraintCompat(*this, OutputExpr, Info, false))
290  return StmtError();
291 
292  OutputConstraintInfos.push_back(Info);
293 
294  // If this is dependent, just continue.
295  if (OutputExpr->isTypeDependent())
296  continue;
297 
299  OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
300  switch (IsLV) {
301  case Expr::MLV_Valid:
302  // Cool, this is an lvalue.
303  break;
304  case Expr::MLV_ArrayType:
305  // This is OK too.
306  break;
307  case Expr::MLV_LValueCast: {
308  const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
309  emitAndFixInvalidAsmCastLValue(LVal, OutputExpr, *this);
310  // Accept, even if we emitted an error diagnostic.
311  break;
312  }
315  if (RequireCompleteType(OutputExpr->getBeginLoc(), Exprs[i]->getType(),
316  diag::err_dereference_incomplete_type))
317  return StmtError();
318  LLVM_FALLTHROUGH;
319  default:
320  return StmtError(Diag(OutputExpr->getBeginLoc(),
321  diag::err_asm_invalid_lvalue_in_output)
322  << OutputExpr->getSourceRange());
323  }
324 
325  unsigned Size = Context.getTypeSize(OutputExpr->getType());
326  if (!Context.getTargetInfo().validateOutputSize(Literal->getString(),
327  Size)) {
328  targetDiag(OutputExpr->getBeginLoc(), diag::err_asm_invalid_output_size)
329  << Info.getConstraintStr();
330  return new (Context)
331  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
332  NumInputs, Names, Constraints, Exprs.data(), AsmString,
333  NumClobbers, Clobbers, RParenLoc);
334  }
335  }
336 
337  SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
338 
339  for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
340  StringLiteral *Literal = Constraints[i];
341  assert(Literal->isAscii());
342 
343  StringRef InputName;
344  if (Names[i])
345  InputName = Names[i]->getName();
346 
347  TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
348  if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
349  Info)) {
350  targetDiag(Literal->getBeginLoc(), diag::err_asm_invalid_input_constraint)
351  << Info.getConstraintStr();
352  return new (Context)
353  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
354  NumInputs, Names, Constraints, Exprs.data(), AsmString,
355  NumClobbers, Clobbers, RParenLoc);
356  }
357 
358  ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
359  if (ER.isInvalid())
360  return StmtError();
361  Exprs[i] = ER.get();
362 
363  Expr *InputExpr = Exprs[i];
364 
365  // Referring to parameters is not allowed in naked functions.
366  if (CheckNakedParmReference(InputExpr, *this))
367  return StmtError();
368 
369  // Check that the input expression is compatible with memory constraint.
370  if (Info.allowsMemory() &&
371  checkExprMemoryConstraintCompat(*this, InputExpr, Info, true))
372  return StmtError();
373 
374  // Only allow void types for memory constraints.
375  if (Info.allowsMemory() && !Info.allowsRegister()) {
376  if (CheckAsmLValue(InputExpr, *this))
377  return StmtError(Diag(InputExpr->getBeginLoc(),
378  diag::err_asm_invalid_lvalue_in_input)
379  << Info.getConstraintStr()
380  << InputExpr->getSourceRange());
381  } else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
382  if (!InputExpr->isValueDependent()) {
383  Expr::EvalResult EVResult;
384  if (!InputExpr->EvaluateAsRValue(EVResult, Context, true))
385  return StmtError(
386  Diag(InputExpr->getBeginLoc(), diag::err_asm_immediate_expected)
387  << Info.getConstraintStr() << InputExpr->getSourceRange());
388 
389  // For compatibility with GCC, we also allow pointers that would be
390  // integral constant expressions if they were cast to int.
391  llvm::APSInt IntResult;
392  if (!EVResult.Val.toIntegralConstant(IntResult, InputExpr->getType(),
393  Context))
394  return StmtError(
395  Diag(InputExpr->getBeginLoc(), diag::err_asm_immediate_expected)
396  << Info.getConstraintStr() << InputExpr->getSourceRange());
397 
398  if (!Info.isValidAsmImmediate(IntResult))
399  return StmtError(Diag(InputExpr->getBeginLoc(),
400  diag::err_invalid_asm_value_for_constraint)
401  << IntResult.toString(10) << Info.getConstraintStr()
402  << InputExpr->getSourceRange());
403  }
404 
405  } else {
406  ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
407  if (Result.isInvalid())
408  return StmtError();
409 
410  Exprs[i] = Result.get();
411  }
412 
413  if (Info.allowsRegister()) {
414  if (InputExpr->getType()->isVoidType()) {
415  return StmtError(
416  Diag(InputExpr->getBeginLoc(), diag::err_asm_invalid_type_in_input)
417  << InputExpr->getType() << Info.getConstraintStr()
418  << InputExpr->getSourceRange());
419  }
420  }
421 
422  InputConstraintInfos.push_back(Info);
423 
424  const Type *Ty = Exprs[i]->getType().getTypePtr();
425  if (Ty->isDependentType())
426  continue;
427 
428  if (!Ty->isVoidType() || !Info.allowsMemory())
429  if (RequireCompleteType(InputExpr->getBeginLoc(), Exprs[i]->getType(),
430  diag::err_dereference_incomplete_type))
431  return StmtError();
432 
433  unsigned Size = Context.getTypeSize(Ty);
434  if (!Context.getTargetInfo().validateInputSize(Literal->getString(),
435  Size))
436  return StmtResult(
437  targetDiag(InputExpr->getBeginLoc(), diag::err_asm_invalid_input_size)
438  << Info.getConstraintStr());
439  }
440 
441  // Check that the clobbers are valid.
442  for (unsigned i = 0; i != NumClobbers; i++) {
443  StringLiteral *Literal = Clobbers[i];
444  assert(Literal->isAscii());
445 
446  StringRef Clobber = Literal->getString();
447 
448  if (!Context.getTargetInfo().isValidClobber(Clobber)) {
449  targetDiag(Literal->getBeginLoc(), diag::err_asm_unknown_register_name)
450  << Clobber;
451  return new (Context)
452  GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
453  NumInputs, Names, Constraints, Exprs.data(), AsmString,
454  NumClobbers, Clobbers, RParenLoc);
455  }
456  }
457 
458  GCCAsmStmt *NS =
459  new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
460  NumInputs, Names, Constraints, Exprs.data(),
461  AsmString, NumClobbers, Clobbers, RParenLoc);
462  // Validate the asm string, ensuring it makes sense given the operands we
463  // have.
465  unsigned DiagOffs;
466  if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
467  targetDiag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
468  << AsmString->getSourceRange();
469  return NS;
470  }
471 
472  // Validate constraints and modifiers.
473  for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
474  GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
475  if (!Piece.isOperand()) continue;
476 
477  // Look for the correct constraint index.
478  unsigned ConstraintIdx = Piece.getOperandNo();
479  unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
480 
481  // Look for the (ConstraintIdx - NumOperands + 1)th constraint with
482  // modifier '+'.
483  if (ConstraintIdx >= NumOperands) {
484  unsigned I = 0, E = NS->getNumOutputs();
485 
486  for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
487  if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
488  ConstraintIdx = I;
489  break;
490  }
491 
492  assert(I != E && "Invalid operand number should have been caught in "
493  " AnalyzeAsmString");
494  }
495 
496  // Now that we have the right indexes go ahead and check.
497  StringLiteral *Literal = Constraints[ConstraintIdx];
498  const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
499  if (Ty->isDependentType() || Ty->isIncompleteType())
500  continue;
501 
502  unsigned Size = Context.getTypeSize(Ty);
503  std::string SuggestedModifier;
505  Literal->getString(), Piece.getModifier(), Size,
506  SuggestedModifier)) {
507  targetDiag(Exprs[ConstraintIdx]->getBeginLoc(),
508  diag::warn_asm_mismatched_size_modifier);
509 
510  if (!SuggestedModifier.empty()) {
511  auto B = targetDiag(Piece.getRange().getBegin(),
512  diag::note_asm_missing_constraint_modifier)
513  << SuggestedModifier;
514  SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
515  B << FixItHint::CreateReplacement(Piece.getRange(), SuggestedModifier);
516  }
517  }
518  }
519 
520  // Validate tied input operands for type mismatches.
521  unsigned NumAlternatives = ~0U;
522  for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
523  TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
524  StringRef ConstraintStr = Info.getConstraintStr();
525  unsigned AltCount = ConstraintStr.count(',') + 1;
526  if (NumAlternatives == ~0U) {
527  NumAlternatives = AltCount;
528  } else if (NumAlternatives != AltCount) {
529  targetDiag(NS->getOutputExpr(i)->getBeginLoc(),
530  diag::err_asm_unexpected_constraint_alternatives)
531  << NumAlternatives << AltCount;
532  return NS;
533  }
534  }
535  SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
536  ~0U);
537  for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
538  TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
539  StringRef ConstraintStr = Info.getConstraintStr();
540  unsigned AltCount = ConstraintStr.count(',') + 1;
541  if (NumAlternatives == ~0U) {
542  NumAlternatives = AltCount;
543  } else if (NumAlternatives != AltCount) {
544  targetDiag(NS->getInputExpr(i)->getBeginLoc(),
545  diag::err_asm_unexpected_constraint_alternatives)
546  << NumAlternatives << AltCount;
547  return NS;
548  }
549 
550  // If this is a tied constraint, verify that the output and input have
551  // either exactly the same type, or that they are int/ptr operands with the
552  // same size (int/long, int*/long, are ok etc).
553  if (!Info.hasTiedOperand()) continue;
554 
555  unsigned TiedTo = Info.getTiedOperand();
556  unsigned InputOpNo = i+NumOutputs;
557  Expr *OutputExpr = Exprs[TiedTo];
558  Expr *InputExpr = Exprs[InputOpNo];
559 
560  // Make sure no more than one input constraint matches each output.
561  assert(TiedTo < InputMatchedToOutput.size() && "TiedTo value out of range");
562  if (InputMatchedToOutput[TiedTo] != ~0U) {
563  targetDiag(NS->getInputExpr(i)->getBeginLoc(),
564  diag::err_asm_input_duplicate_match)
565  << TiedTo;
566  targetDiag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getBeginLoc(),
567  diag::note_asm_input_duplicate_first)
568  << TiedTo;
569  return NS;
570  }
571  InputMatchedToOutput[TiedTo] = i;
572 
573  if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
574  continue;
575 
576  QualType InTy = InputExpr->getType();
577  QualType OutTy = OutputExpr->getType();
578  if (Context.hasSameType(InTy, OutTy))
579  continue; // All types can be tied to themselves.
580 
581  // Decide if the input and output are in the same domain (integer/ptr or
582  // floating point.
583  enum AsmDomain {
584  AD_Int, AD_FP, AD_Other
585  } InputDomain, OutputDomain;
586 
587  if (InTy->isIntegerType() || InTy->isPointerType())
588  InputDomain = AD_Int;
589  else if (InTy->isRealFloatingType())
590  InputDomain = AD_FP;
591  else
592  InputDomain = AD_Other;
593 
594  if (OutTy->isIntegerType() || OutTy->isPointerType())
595  OutputDomain = AD_Int;
596  else if (OutTy->isRealFloatingType())
597  OutputDomain = AD_FP;
598  else
599  OutputDomain = AD_Other;
600 
601  // They are ok if they are the same size and in the same domain. This
602  // allows tying things like:
603  // void* to int*
604  // void* to int if they are the same size.
605  // double to long double if they are the same size.
606  //
607  uint64_t OutSize = Context.getTypeSize(OutTy);
608  uint64_t InSize = Context.getTypeSize(InTy);
609  if (OutSize == InSize && InputDomain == OutputDomain &&
610  InputDomain != AD_Other)
611  continue;
612 
613  // If the smaller input/output operand is not mentioned in the asm string,
614  // then we can promote the smaller one to a larger input and the asm string
615  // won't notice.
616  bool SmallerValueMentioned = false;
617 
618  // If this is a reference to the input and if the input was the smaller
619  // one, then we have to reject this asm.
620  if (isOperandMentioned(InputOpNo, Pieces)) {
621  // This is a use in the asm string of the smaller operand. Since we
622  // codegen this by promoting to a wider value, the asm will get printed
623  // "wrong".
624  SmallerValueMentioned |= InSize < OutSize;
625  }
626  if (isOperandMentioned(TiedTo, Pieces)) {
627  // If this is a reference to the output, and if the output is the larger
628  // value, then it's ok because we'll promote the input to the larger type.
629  SmallerValueMentioned |= OutSize < InSize;
630  }
631 
632  // If the smaller value wasn't mentioned in the asm string, and if the
633  // output was a register, just extend the shorter one to the size of the
634  // larger one.
635  if (!SmallerValueMentioned && InputDomain != AD_Other &&
636  OutputConstraintInfos[TiedTo].allowsRegister())
637  continue;
638 
639  // Either both of the operands were mentioned or the smaller one was
640  // mentioned. One more special case that we'll allow: if the tied input is
641  // integer, unmentioned, and is a constant, then we'll allow truncating it
642  // down to the size of the destination.
643  if (InputDomain == AD_Int && OutputDomain == AD_Int &&
644  !isOperandMentioned(InputOpNo, Pieces) &&
645  InputExpr->isEvaluatable(Context)) {
646  CastKind castKind =
647  (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
648  InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
649  Exprs[InputOpNo] = InputExpr;
650  NS->setInputExpr(i, InputExpr);
651  continue;
652  }
653 
654  targetDiag(InputExpr->getBeginLoc(), diag::err_asm_tying_incompatible_types)
655  << InTy << OutTy << OutputExpr->getSourceRange()
656  << InputExpr->getSourceRange();
657  return NS;
658  }
659 
660  // Check for conflicts between clobber list and input or output lists
661  SourceLocation ConstraintLoc =
662  getClobberConflictLocation(Exprs, Constraints, Clobbers, NumClobbers,
663  Context.getTargetInfo(), Context);
664  if (ConstraintLoc.isValid())
665  targetDiag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber);
666 
667  return NS;
668 }
669 
671  llvm::InlineAsmIdentifierInfo &Info) {
672  QualType T = Res->getType();
673  Expr::EvalResult Eval;
674  if (T->isFunctionType() || T->isDependentType())
675  return Info.setLabel(Res);
676  if (Res->isRValue()) {
677  if (isa<clang::EnumType>(T) && Res->EvaluateAsRValue(Eval, Context))
678  return Info.setEnum(Eval.Val.getInt().getSExtValue());
679  return Info.setLabel(Res);
680  }
681  unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
682  unsigned Type = Size;
683  if (const auto *ATy = Context.getAsArrayType(T))
684  Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
685  bool IsGlobalLV = false;
686  if (Res->EvaluateAsLValue(Eval, Context))
687  IsGlobalLV = Eval.isGlobalLValue();
688  Info.setVar(Res, IsGlobalLV, Size, Type);
689 }
690 
692  SourceLocation TemplateKWLoc,
693  UnqualifiedId &Id,
694  bool IsUnevaluatedContext) {
695 
696  if (IsUnevaluatedContext)
697  PushExpressionEvaluationContext(
698  ExpressionEvaluationContext::UnevaluatedAbstract,
699  ReuseLambdaContextDecl);
700 
701  ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
702  /*trailing lparen*/ false,
703  /*is & operand*/ false,
704  /*CorrectionCandidateCallback=*/nullptr,
705  /*IsInlineAsmIdentifier=*/ true);
706 
707  if (IsUnevaluatedContext)
708  PopExpressionEvaluationContext();
709 
710  if (!Result.isUsable()) return Result;
711 
712  Result = CheckPlaceholderExpr(Result.get());
713  if (!Result.isUsable()) return Result;
714 
715  // Referring to parameters is not allowed in naked functions.
716  if (CheckNakedParmReference(Result.get(), *this))
717  return ExprError();
718 
719  QualType T = Result.get()->getType();
720 
721  if (T->isDependentType()) {
722  return Result;
723  }
724 
725  // Any sort of function type is fine.
726  if (T->isFunctionType()) {
727  return Result;
728  }
729 
730  // Otherwise, it needs to be a complete type.
731  if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
732  return ExprError();
733  }
734 
735  return Result;
736 }
737 
738 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
739  unsigned &Offset, SourceLocation AsmLoc) {
740  Offset = 0;
742  Member.split(Members, ".");
743 
744  NamedDecl *FoundDecl = nullptr;
745 
746  // MS InlineAsm uses 'this' as a base
747  if (getLangOpts().CPlusPlus && Base.equals("this")) {
748  if (const Type *PT = getCurrentThisType().getTypePtrOrNull())
749  FoundDecl = PT->getPointeeType()->getAsTagDecl();
750  } else {
751  LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
752  LookupOrdinaryName);
753  if (LookupName(BaseResult, getCurScope()) && BaseResult.isSingleResult())
754  FoundDecl = BaseResult.getFoundDecl();
755  }
756 
757  if (!FoundDecl)
758  return true;
759 
760  for (StringRef NextMember : Members) {
761  const RecordType *RT = nullptr;
762  if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
763  RT = VD->getType()->getAs<RecordType>();
764  else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
765  MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
766  // MS InlineAsm often uses struct pointer aliases as a base
767  QualType QT = TD->getUnderlyingType();
768  if (const auto *PT = QT->getAs<PointerType>())
769  QT = PT->getPointeeType();
770  RT = QT->getAs<RecordType>();
771  } else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
772  RT = TD->getTypeForDecl()->getAs<RecordType>();
773  else if (FieldDecl *TD = dyn_cast<FieldDecl>(FoundDecl))
774  RT = TD->getType()->getAs<RecordType>();
775  if (!RT)
776  return true;
777 
778  if (RequireCompleteType(AsmLoc, QualType(RT, 0),
779  diag::err_asm_incomplete_type))
780  return true;
781 
782  LookupResult FieldResult(*this, &Context.Idents.get(NextMember),
783  SourceLocation(), LookupMemberName);
784 
785  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
786  return true;
787 
788  if (!FieldResult.isSingleResult())
789  return true;
790  FoundDecl = FieldResult.getFoundDecl();
791 
792  // FIXME: Handle IndirectFieldDecl?
793  FieldDecl *FD = dyn_cast<FieldDecl>(FoundDecl);
794  if (!FD)
795  return true;
796 
797  const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
798  unsigned i = FD->getFieldIndex();
799  CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
800  Offset += (unsigned)Result.getQuantity();
801  }
802 
803  return false;
804 }
805 
808  SourceLocation AsmLoc) {
809 
810  QualType T = E->getType();
811  if (T->isDependentType()) {
812  DeclarationNameInfo NameInfo;
813  NameInfo.setLoc(AsmLoc);
814  NameInfo.setName(&Context.Idents.get(Member));
816  Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
817  SourceLocation(),
818  /*FirstQualifierInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
819  }
820 
821  const RecordType *RT = T->getAs<RecordType>();
822  // FIXME: Diagnose this as field access into a scalar type.
823  if (!RT)
824  return ExprResult();
825 
826  LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
827  LookupMemberName);
828 
829  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
830  return ExprResult();
831 
832  // Only normal and indirect field results will work.
833  ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
834  if (!FD)
835  FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
836  if (!FD)
837  return ExprResult();
838 
839  // Make an Expr to thread through OpDecl.
840  ExprResult Result = BuildMemberReferenceExpr(
841  E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
842  SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
843 
844  return Result;
845 }
846 
848  ArrayRef<Token> AsmToks,
849  StringRef AsmString,
850  unsigned NumOutputs, unsigned NumInputs,
851  ArrayRef<StringRef> Constraints,
852  ArrayRef<StringRef> Clobbers,
853  ArrayRef<Expr*> Exprs,
854  SourceLocation EndLoc) {
855  bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
856  setFunctionHasBranchProtectedScope();
857  MSAsmStmt *NS =
858  new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
859  /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
860  Constraints, Exprs, AsmString,
861  Clobbers, EndLoc);
862  return NS;
863 }
864 
865 LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
866  SourceLocation Location,
867  bool AlwaysCreate) {
868  LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
869  Location);
870 
871  if (Label->isMSAsmLabel()) {
872  // If we have previously created this label implicitly, mark it as used.
873  Label->markUsed(Context);
874  } else {
875  // Otherwise, insert it, but only resolve it if we have seen the label itself.
876  std::string InternalName;
877  llvm::raw_string_ostream OS(InternalName);
878  // Create an internal name for the label. The name should not be a valid
879  // mangled name, and should be unique. We use a dot to make the name an
880  // invalid mangled name. We use LLVM's inline asm ${:uid} escape so that a
881  // unique label is generated each time this blob is emitted, even after
882  // inlining or LTO.
883  OS << "__MSASMLABEL_.${:uid}__";
884  for (char C : ExternalLabelName) {
885  OS << C;
886  // We escape '$' in asm strings by replacing it with "$$"
887  if (C == '$')
888  OS << '$';
889  }
890  Label->setMSAsmLabel(OS.str());
891  }
892  if (AlwaysCreate) {
893  // The label might have been created implicitly from a previously encountered
894  // goto statement. So, for both newly created and looked up labels, we mark
895  // them as resolved.
896  Label->setMSAsmLabelResolved();
897  }
898  // Adjust their location for being able to generate accurate diagnostics.
899  Label->setLocation(Location);
900 
901  return Label;
902 }
This represents a GCC inline-assembly statement extension.
Definition: Stmt.h:2792
Represents a function declaration or definition.
Definition: Decl.h:1737
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:2704
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2549
A (possibly-)qualified type.
Definition: Type.h:639
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:65
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:505
StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple, bool IsVolatile, unsigned NumOutputs, unsigned NumInputs, IdentifierInfo **Names, MultiExprArg Constraints, MultiExprArg Exprs, Expr *AsmString, MultiExprArg Clobbers, SourceLocation RParenLoc)
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:1959
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:1019
unsigned getNumOutputs() const
Definition: Stmt.h:2682
bool isAscii() const
Definition: Expr.h:1718
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1363
unsigned getFieldIndex() const
Returns the index of this field within its record, as appropriate for passing to ASTRecordLayout::get...
Definition: Decl.cpp:3820
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:1414
bool validateInputConstraint(MutableArrayRef< ConstraintInfo > OutputConstraints, ConstraintInfo &info) const
Definition: TargetInfo.cpp:623
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:689
isModifiableLvalueResult
Definition: Expr.h:271
void setInputExpr(unsigned i, Expr *E)
Definition: Stmt.cpp:443
Represents a variable declaration or definition.
Definition: Decl.h:812
ActionResult< Stmt * > StmtResult
Definition: Ownership.h:264
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6768
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:507
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:154
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:485
virtual bool validateConstraintModifier(StringRef, char, unsigned, std::string &) const
Definition: TargetInfo.h:932
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:263
Represents a member of a struct/union/class.
Definition: Decl.h:2578
CharSourceRange getRange() const
Definition: Stmt.h:2857
void setName(DeclarationName N)
setName - Sets the embedded declaration name.
Expr * getSubExpr()
Definition: Expr.h:3093
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:565
LabelDecl * GetOrCreateMSAsmLabel(StringRef ExternalLabelName, SourceLocation Location, bool AlwaysCreate)
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:933
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:439
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:37
APValue Val
Val - This is the value the expression can be folded to.
Definition: Expr.h:575
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:407
child_range children()
Definition: Stmt.cpp:212
StmtResult StmtError()
Definition: Ownership.h:280
Represents a declaration of a type.
Definition: Decl.h:2873
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:799
Expr * getOutputExpr(unsigned i)
Definition: Stmt.cpp:428
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:62
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3041
const LangOptions & getLangOpts() const
Definition: Sema.h:1286
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:169
virtual bool isValidGCCRegisterName(StringRef Name) const
Returns whether the passed in string is a valid register name according to GCC.
Definition: TargetInfo.cpp:440
Expr * IgnoreImpCasts() LLVM_READONLY
Skip past any implicit casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2707
NodeId Parent
Definition: ASTDiff.cpp:191
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Id, bool IsUnevaluatedContext)
bool hasAttr() const
Definition: DeclBase.h:534
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:328
StringRef getString() const
Definition: Expr.h:1682
bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const
EvaluateAsLValue - Evaluate an expression to see if we can fold it to an lvalue with link time known ...
bool isValidClobber(StringRef Name) const
Returns whether the passed in string is a valid clobber in an inline asm statement.
Definition: TargetInfo.cpp:432
CastKind
CastKind - The kind of operation required for a conversion.
unsigned getOperandNo() const
Definition: Stmt.h:2852
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:178
static bool CheckNakedParmReference(Expr *E, Sema &S)
unsigned Offset
Definition: Format.cpp:1709
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:161
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:636
This represents one expression.
Definition: Expr.h:108
std::string Label
int Id
Definition: ASTDiff.cpp:190
static SourceLocation getClobberConflictLocation(MultiExprArg Exprs, StringLiteral **Constraints, StringLiteral **Clobbers, int NumClobbers, const TargetInfo &Target, ASTContext &Cont)
AsmStringPiece - this is part of a decomposed asm string specification (for use with the AnalyzeAsmSt...
Definition: Stmt.h:2825
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:1349
Defines the clang::TypeLoc interface and its subclasses.
QualType getType() const
Definition: Expr.h:130
void setValueKind(ExprValueKind Cat)
setValueKind - Set the value kind produced by this expression.
Definition: Expr.h:424
ActionResult< CXXBaseSpecifier * > BaseResult
Definition: Ownership.h:266
This represents a Microsoft inline-assembly statement extension.
Definition: Stmt.h:2967
bool isInvalid() const
Definition: Ownership.h:166
void setLocation(SourceLocation L)
Definition: DeclBase.h:422
bool isUsable() const
Definition: Ownership.h:167
RecordDecl * getDecl() const
Definition: Type.h:4392
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)
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member, SourceLocation AsmLoc)
Represents the declaration of a label.
Definition: Decl.h:468
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:2850
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
bool validateOutputConstraint(ConstraintInfo &Info) const
Definition: TargetInfo.cpp:526
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:151
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1774
bool isMSAsmLabel() const
Definition: Decl.h:502
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:251
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:3637
Expr * getInputExpr(unsigned i)
Definition: Stmt.cpp:439
StringRef getName() const
Return the actual identifier string.
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2915
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:573
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:2824
void setSubExpr(Expr *E)
Definition: Expr.h:3095
bool isBooleanType() const
Definition: Type.h:6677
char getModifier() const
getModifier - Get the modifier for this operand, if present.
Definition: Stmt.cpp:419
bool hasTiedOperand() const
Return true if this input operand is a matching constraint that ties it to an output operand...
Definition: TargetInfo.h:849
bool toIntegralConstant(APSInt &Result, QualType SrcTy, const ASTContext &Ctx) const
Try to convert this value to an integral constant.
Definition: APValue.cpp:617
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
const std::string & getConstraintStr() const
Definition: TargetInfo.h:833
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4382
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6594
T * getAttr() const
Definition: DeclBase.h:530
bool isFunctionType() const
Definition: Type.h:6304
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2282
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:411
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2072
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:2053
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:3663
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
virtual bool validateOutputSize(StringRef, unsigned) const
Definition: TargetInfo.h:922
bool isVoidType() const
Definition: Type.h:6560
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:4409
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:386
bool isRValue() const
Definition: Expr.h:252
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:128
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:251
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1599
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:2088
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:1074
bool isPointerType() const
Definition: Type.h:6308
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
void setMSAsmLabelResolved()
Definition: Decl.h:506
virtual bool validateInputSize(StringRef, unsigned) const
Definition: TargetInfo.h:927
ASTContext & Context
Definition: Sema.h:374
This represents a decl that may have a name.
Definition: Decl.h:248
APSInt & getInt()
Definition: APValue.h:257
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:2750
Attr - This represents one attribute.
Definition: Attr.h:43