clang  9.0.0svn
Expr.cpp
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1 //===--- Expr.cpp - Expression AST Node Implementation --------------------===//
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 the Expr class and subclasses.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/Attr.h"
15 #include "clang/AST/DeclCXX.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/ExprCXX.h"
21 #include "clang/AST/Mangle.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "clang/AST/StmtVisitor.h"
24 #include "clang/Basic/Builtins.h"
25 #include "clang/Basic/CharInfo.h"
27 #include "clang/Basic/TargetInfo.h"
28 #include "clang/Lex/Lexer.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/raw_ostream.h"
32 #include <algorithm>
33 #include <cstring>
34 using namespace clang;
35 
37  const Expr *E = this;
38  while (true) {
39  E = E->ignoreParenBaseCasts();
40 
41  // Follow the RHS of a comma operator.
42  if (auto *BO = dyn_cast<BinaryOperator>(E)) {
43  if (BO->getOpcode() == BO_Comma) {
44  E = BO->getRHS();
45  continue;
46  }
47  }
48 
49  // Step into initializer for materialized temporaries.
50  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
51  E = MTE->GetTemporaryExpr();
52  continue;
53  }
54 
55  break;
56  }
57 
58  return E;
59 }
60 
62  const Expr *E = getBestDynamicClassTypeExpr();
63  QualType DerivedType = E->getType();
64  if (const PointerType *PTy = DerivedType->getAs<PointerType>())
65  DerivedType = PTy->getPointeeType();
66 
67  if (DerivedType->isDependentType())
68  return nullptr;
69 
70  const RecordType *Ty = DerivedType->castAs<RecordType>();
71  Decl *D = Ty->getDecl();
72  return cast<CXXRecordDecl>(D);
73 }
74 
77  SmallVectorImpl<SubobjectAdjustment> &Adjustments) const {
78  const Expr *E = this;
79  while (true) {
80  E = E->IgnoreParens();
81 
82  if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
83  if ((CE->getCastKind() == CK_DerivedToBase ||
84  CE->getCastKind() == CK_UncheckedDerivedToBase) &&
85  E->getType()->isRecordType()) {
86  E = CE->getSubExpr();
87  CXXRecordDecl *Derived
88  = cast<CXXRecordDecl>(E->getType()->getAs<RecordType>()->getDecl());
89  Adjustments.push_back(SubobjectAdjustment(CE, Derived));
90  continue;
91  }
92 
93  if (CE->getCastKind() == CK_NoOp) {
94  E = CE->getSubExpr();
95  continue;
96  }
97  } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
98  if (!ME->isArrow()) {
99  assert(ME->getBase()->getType()->isRecordType());
100  if (FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
101  if (!Field->isBitField() && !Field->getType()->isReferenceType()) {
102  E = ME->getBase();
103  Adjustments.push_back(SubobjectAdjustment(Field));
104  continue;
105  }
106  }
107  }
108  } else if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
109  if (BO->getOpcode() == BO_PtrMemD) {
110  assert(BO->getRHS()->isRValue());
111  E = BO->getLHS();
112  const MemberPointerType *MPT =
113  BO->getRHS()->getType()->getAs<MemberPointerType>();
114  Adjustments.push_back(SubobjectAdjustment(MPT, BO->getRHS()));
115  continue;
116  } else if (BO->getOpcode() == BO_Comma) {
117  CommaLHSs.push_back(BO->getLHS());
118  E = BO->getRHS();
119  continue;
120  }
121  }
122 
123  // Nothing changed.
124  break;
125  }
126  return E;
127 }
128 
129 /// isKnownToHaveBooleanValue - Return true if this is an integer expression
130 /// that is known to return 0 or 1. This happens for _Bool/bool expressions
131 /// but also int expressions which are produced by things like comparisons in
132 /// C.
134  const Expr *E = IgnoreParens();
135 
136  // If this value has _Bool type, it is obvious 0/1.
137  if (E->getType()->isBooleanType()) return true;
138  // If this is a non-scalar-integer type, we don't care enough to try.
139  if (!E->getType()->isIntegralOrEnumerationType()) return false;
140 
141  if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
142  switch (UO->getOpcode()) {
143  case UO_Plus:
144  return UO->getSubExpr()->isKnownToHaveBooleanValue();
145  case UO_LNot:
146  return true;
147  default:
148  return false;
149  }
150  }
151 
152  // Only look through implicit casts. If the user writes
153  // '(int) (a && b)' treat it as an arbitrary int.
154  if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E))
155  return CE->getSubExpr()->isKnownToHaveBooleanValue();
156 
157  if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
158  switch (BO->getOpcode()) {
159  default: return false;
160  case BO_LT: // Relational operators.
161  case BO_GT:
162  case BO_LE:
163  case BO_GE:
164  case BO_EQ: // Equality operators.
165  case BO_NE:
166  case BO_LAnd: // AND operator.
167  case BO_LOr: // Logical OR operator.
168  return true;
169 
170  case BO_And: // Bitwise AND operator.
171  case BO_Xor: // Bitwise XOR operator.
172  case BO_Or: // Bitwise OR operator.
173  // Handle things like (x==2)|(y==12).
174  return BO->getLHS()->isKnownToHaveBooleanValue() &&
175  BO->getRHS()->isKnownToHaveBooleanValue();
176 
177  case BO_Comma:
178  case BO_Assign:
179  return BO->getRHS()->isKnownToHaveBooleanValue();
180  }
181  }
182 
183  if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
184  return CO->getTrueExpr()->isKnownToHaveBooleanValue() &&
185  CO->getFalseExpr()->isKnownToHaveBooleanValue();
186 
187  return false;
188 }
189 
190 // Amusing macro metaprogramming hack: check whether a class provides
191 // a more specific implementation of getExprLoc().
192 //
193 // See also Stmt.cpp:{getBeginLoc(),getEndLoc()}.
194 namespace {
195  /// This implementation is used when a class provides a custom
196  /// implementation of getExprLoc.
197  template <class E, class T>
198  SourceLocation getExprLocImpl(const Expr *expr,
199  SourceLocation (T::*v)() const) {
200  return static_cast<const E*>(expr)->getExprLoc();
201  }
202 
203  /// This implementation is used when a class doesn't provide
204  /// a custom implementation of getExprLoc. Overload resolution
205  /// should pick it over the implementation above because it's
206  /// more specialized according to function template partial ordering.
207  template <class E>
208  SourceLocation getExprLocImpl(const Expr *expr,
209  SourceLocation (Expr::*v)() const) {
210  return static_cast<const E *>(expr)->getBeginLoc();
211  }
212 }
213 
215  switch (getStmtClass()) {
216  case Stmt::NoStmtClass: llvm_unreachable("statement without class");
217 #define ABSTRACT_STMT(type)
218 #define STMT(type, base) \
219  case Stmt::type##Class: break;
220 #define EXPR(type, base) \
221  case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
222 #include "clang/AST/StmtNodes.inc"
223  }
224  llvm_unreachable("unknown expression kind");
225 }
226 
227 //===----------------------------------------------------------------------===//
228 // Primary Expressions.
229 //===----------------------------------------------------------------------===//
230 
231 /// Compute the type-, value-, and instantiation-dependence of a
232 /// declaration reference
233 /// based on the declaration being referenced.
234 static void computeDeclRefDependence(const ASTContext &Ctx, NamedDecl *D,
235  QualType T, bool &TypeDependent,
236  bool &ValueDependent,
237  bool &InstantiationDependent) {
238  TypeDependent = false;
239  ValueDependent = false;
240  InstantiationDependent = false;
241 
242  // (TD) C++ [temp.dep.expr]p3:
243  // An id-expression is type-dependent if it contains:
244  //
245  // and
246  //
247  // (VD) C++ [temp.dep.constexpr]p2:
248  // An identifier is value-dependent if it is:
249 
250  // (TD) - an identifier that was declared with dependent type
251  // (VD) - a name declared with a dependent type,
252  if (T->isDependentType()) {
253  TypeDependent = true;
254  ValueDependent = true;
255  InstantiationDependent = true;
256  return;
257  } else if (T->isInstantiationDependentType()) {
258  InstantiationDependent = true;
259  }
260 
261  // (TD) - a conversion-function-id that specifies a dependent type
262  if (D->getDeclName().getNameKind()
265  if (T->isDependentType()) {
266  TypeDependent = true;
267  ValueDependent = true;
268  InstantiationDependent = true;
269  return;
270  }
271 
273  InstantiationDependent = true;
274  }
275 
276  // (VD) - the name of a non-type template parameter,
277  if (isa<NonTypeTemplateParmDecl>(D)) {
278  ValueDependent = true;
279  InstantiationDependent = true;
280  return;
281  }
282 
283  // (VD) - a constant with integral or enumeration type and is
284  // initialized with an expression that is value-dependent.
285  // (VD) - a constant with literal type and is initialized with an
286  // expression that is value-dependent [C++11].
287  // (VD) - FIXME: Missing from the standard:
288  // - an entity with reference type and is initialized with an
289  // expression that is value-dependent [C++11]
290  if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
291  if ((Ctx.getLangOpts().CPlusPlus11 ?
292  Var->getType()->isLiteralType(Ctx) :
293  Var->getType()->isIntegralOrEnumerationType()) &&
294  (Var->getType().isConstQualified() ||
295  Var->getType()->isReferenceType())) {
296  if (const Expr *Init = Var->getAnyInitializer())
297  if (Init->isValueDependent()) {
298  ValueDependent = true;
299  InstantiationDependent = true;
300  }
301  }
302 
303  // (VD) - FIXME: Missing from the standard:
304  // - a member function or a static data member of the current
305  // instantiation
306  if (Var->isStaticDataMember() &&
307  Var->getDeclContext()->isDependentContext()) {
308  ValueDependent = true;
309  InstantiationDependent = true;
310  TypeSourceInfo *TInfo = Var->getFirstDecl()->getTypeSourceInfo();
311  if (TInfo->getType()->isIncompleteArrayType())
312  TypeDependent = true;
313  }
314 
315  return;
316  }
317 
318  // (VD) - FIXME: Missing from the standard:
319  // - a member function or a static data member of the current
320  // instantiation
321  if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) {
322  ValueDependent = true;
323  InstantiationDependent = true;
324  }
325 }
326 
327 void DeclRefExpr::computeDependence(const ASTContext &Ctx) {
328  bool TypeDependent = false;
329  bool ValueDependent = false;
330  bool InstantiationDependent = false;
331  computeDeclRefDependence(Ctx, getDecl(), getType(), TypeDependent,
332  ValueDependent, InstantiationDependent);
333 
334  ExprBits.TypeDependent |= TypeDependent;
335  ExprBits.ValueDependent |= ValueDependent;
336  ExprBits.InstantiationDependent |= InstantiationDependent;
337 
338  // Is the declaration a parameter pack?
339  if (getDecl()->isParameterPack())
340  ExprBits.ContainsUnexpandedParameterPack = true;
341 }
342 
343 DeclRefExpr::DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
344  bool RefersToEnclosingVariableOrCapture, QualType T,
346  const DeclarationNameLoc &LocInfo)
347  : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
348  D(D), DNLoc(LocInfo) {
349  DeclRefExprBits.HasQualifier = false;
350  DeclRefExprBits.HasTemplateKWAndArgsInfo = false;
351  DeclRefExprBits.HasFoundDecl = false;
352  DeclRefExprBits.HadMultipleCandidates = false;
353  DeclRefExprBits.RefersToEnclosingVariableOrCapture =
354  RefersToEnclosingVariableOrCapture;
355  DeclRefExprBits.Loc = L;
356  computeDependence(Ctx);
357 }
358 
359 DeclRefExpr::DeclRefExpr(const ASTContext &Ctx,
360  NestedNameSpecifierLoc QualifierLoc,
361  SourceLocation TemplateKWLoc, ValueDecl *D,
362  bool RefersToEnclosingVariableOrCapture,
363  const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
364  const TemplateArgumentListInfo *TemplateArgs,
365  QualType T, ExprValueKind VK)
366  : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
367  D(D), DNLoc(NameInfo.getInfo()) {
368  DeclRefExprBits.Loc = NameInfo.getLoc();
369  DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
370  if (QualifierLoc) {
371  new (getTrailingObjects<NestedNameSpecifierLoc>())
372  NestedNameSpecifierLoc(QualifierLoc);
373  auto *NNS = QualifierLoc.getNestedNameSpecifier();
374  if (NNS->isInstantiationDependent())
375  ExprBits.InstantiationDependent = true;
376  if (NNS->containsUnexpandedParameterPack())
377  ExprBits.ContainsUnexpandedParameterPack = true;
378  }
379  DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
380  if (FoundD)
381  *getTrailingObjects<NamedDecl *>() = FoundD;
382  DeclRefExprBits.HasTemplateKWAndArgsInfo
383  = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
384  DeclRefExprBits.RefersToEnclosingVariableOrCapture =
385  RefersToEnclosingVariableOrCapture;
386  if (TemplateArgs) {
387  bool Dependent = false;
388  bool InstantiationDependent = false;
389  bool ContainsUnexpandedParameterPack = false;
390  getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
391  TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
392  Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
393  assert(!Dependent && "built a DeclRefExpr with dependent template args");
394  ExprBits.InstantiationDependent |= InstantiationDependent;
395  ExprBits.ContainsUnexpandedParameterPack |= ContainsUnexpandedParameterPack;
396  } else if (TemplateKWLoc.isValid()) {
397  getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
398  TemplateKWLoc);
399  }
400  DeclRefExprBits.HadMultipleCandidates = 0;
401 
402  computeDependence(Ctx);
403 }
404 
406  NestedNameSpecifierLoc QualifierLoc,
407  SourceLocation TemplateKWLoc,
408  ValueDecl *D,
409  bool RefersToEnclosingVariableOrCapture,
410  SourceLocation NameLoc,
411  QualType T,
412  ExprValueKind VK,
413  NamedDecl *FoundD,
414  const TemplateArgumentListInfo *TemplateArgs) {
415  return Create(Context, QualifierLoc, TemplateKWLoc, D,
416  RefersToEnclosingVariableOrCapture,
417  DeclarationNameInfo(D->getDeclName(), NameLoc),
418  T, VK, FoundD, TemplateArgs);
419 }
420 
422  NestedNameSpecifierLoc QualifierLoc,
423  SourceLocation TemplateKWLoc,
424  ValueDecl *D,
425  bool RefersToEnclosingVariableOrCapture,
426  const DeclarationNameInfo &NameInfo,
427  QualType T,
428  ExprValueKind VK,
429  NamedDecl *FoundD,
430  const TemplateArgumentListInfo *TemplateArgs) {
431  // Filter out cases where the found Decl is the same as the value refenenced.
432  if (D == FoundD)
433  FoundD = nullptr;
434 
435  bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
436  std::size_t Size =
437  totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
439  QualifierLoc ? 1 : 0, FoundD ? 1 : 0,
440  HasTemplateKWAndArgsInfo ? 1 : 0,
441  TemplateArgs ? TemplateArgs->size() : 0);
442 
443  void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
444  return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
445  RefersToEnclosingVariableOrCapture,
446  NameInfo, FoundD, TemplateArgs, T, VK);
447 }
448 
450  bool HasQualifier,
451  bool HasFoundDecl,
452  bool HasTemplateKWAndArgsInfo,
453  unsigned NumTemplateArgs) {
454  assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
455  std::size_t Size =
456  totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
458  HasQualifier ? 1 : 0, HasFoundDecl ? 1 : 0, HasTemplateKWAndArgsInfo,
459  NumTemplateArgs);
460  void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
461  return new (Mem) DeclRefExpr(EmptyShell());
462 }
463 
465  if (hasQualifier())
466  return getQualifierLoc().getBeginLoc();
467  return getNameInfo().getBeginLoc();
468 }
471  return getRAngleLoc();
472  return getNameInfo().getEndLoc();
473 }
474 
475 PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy, IdentKind IK,
476  StringLiteral *SL)
477  : Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary,
478  FNTy->isDependentType(), FNTy->isDependentType(),
480  /*ContainsUnexpandedParameterPack=*/false) {
481  PredefinedExprBits.Kind = IK;
482  assert((getIdentKind() == IK) &&
483  "IdentKind do not fit in PredefinedExprBitfields!");
484  bool HasFunctionName = SL != nullptr;
485  PredefinedExprBits.HasFunctionName = HasFunctionName;
486  PredefinedExprBits.Loc = L;
487  if (HasFunctionName)
488  setFunctionName(SL);
489 }
490 
491 PredefinedExpr::PredefinedExpr(EmptyShell Empty, bool HasFunctionName)
492  : Expr(PredefinedExprClass, Empty) {
493  PredefinedExprBits.HasFunctionName = HasFunctionName;
494 }
495 
497  QualType FNTy, IdentKind IK,
498  StringLiteral *SL) {
499  bool HasFunctionName = SL != nullptr;
500  void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(HasFunctionName),
501  alignof(PredefinedExpr));
502  return new (Mem) PredefinedExpr(L, FNTy, IK, SL);
503 }
504 
506  bool HasFunctionName) {
507  void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(HasFunctionName),
508  alignof(PredefinedExpr));
509  return new (Mem) PredefinedExpr(EmptyShell(), HasFunctionName);
510 }
511 
513  switch (IK) {
514  case Func:
515  return "__func__";
516  case Function:
517  return "__FUNCTION__";
518  case FuncDName:
519  return "__FUNCDNAME__";
520  case LFunction:
521  return "L__FUNCTION__";
522  case PrettyFunction:
523  return "__PRETTY_FUNCTION__";
524  case FuncSig:
525  return "__FUNCSIG__";
526  case LFuncSig:
527  return "L__FUNCSIG__";
528  case PrettyFunctionNoVirtual:
529  break;
530  }
531  llvm_unreachable("Unknown ident kind for PredefinedExpr");
532 }
533 
534 // FIXME: Maybe this should use DeclPrinter with a special "print predefined
535 // expr" policy instead.
536 std::string PredefinedExpr::ComputeName(IdentKind IK, const Decl *CurrentDecl) {
537  ASTContext &Context = CurrentDecl->getASTContext();
538 
539  if (IK == PredefinedExpr::FuncDName) {
540  if (const NamedDecl *ND = dyn_cast<NamedDecl>(CurrentDecl)) {
541  std::unique_ptr<MangleContext> MC;
542  MC.reset(Context.createMangleContext());
543 
544  if (MC->shouldMangleDeclName(ND)) {
545  SmallString<256> Buffer;
546  llvm::raw_svector_ostream Out(Buffer);
547  if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(ND))
548  MC->mangleCXXCtor(CD, Ctor_Base, Out);
549  else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(ND))
550  MC->mangleCXXDtor(DD, Dtor_Base, Out);
551  else
552  MC->mangleName(ND, Out);
553 
554  if (!Buffer.empty() && Buffer.front() == '\01')
555  return Buffer.substr(1);
556  return Buffer.str();
557  } else
558  return ND->getIdentifier()->getName();
559  }
560  return "";
561  }
562  if (isa<BlockDecl>(CurrentDecl)) {
563  // For blocks we only emit something if it is enclosed in a function
564  // For top-level block we'd like to include the name of variable, but we
565  // don't have it at this point.
566  auto DC = CurrentDecl->getDeclContext();
567  if (DC->isFileContext())
568  return "";
569 
570  SmallString<256> Buffer;
571  llvm::raw_svector_ostream Out(Buffer);
572  if (auto *DCBlock = dyn_cast<BlockDecl>(DC))
573  // For nested blocks, propagate up to the parent.
574  Out << ComputeName(IK, DCBlock);
575  else if (auto *DCDecl = dyn_cast<Decl>(DC))
576  Out << ComputeName(IK, DCDecl) << "_block_invoke";
577  return Out.str();
578  }
579  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
580  if (IK != PrettyFunction && IK != PrettyFunctionNoVirtual &&
581  IK != FuncSig && IK != LFuncSig)
582  return FD->getNameAsString();
583 
584  SmallString<256> Name;
585  llvm::raw_svector_ostream Out(Name);
586 
587  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
588  if (MD->isVirtual() && IK != PrettyFunctionNoVirtual)
589  Out << "virtual ";
590  if (MD->isStatic())
591  Out << "static ";
592  }
593 
594  PrintingPolicy Policy(Context.getLangOpts());
595  std::string Proto;
596  llvm::raw_string_ostream POut(Proto);
597 
598  const FunctionDecl *Decl = FD;
599  if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
600  Decl = Pattern;
601  const FunctionType *AFT = Decl->getType()->getAs<FunctionType>();
602  const FunctionProtoType *FT = nullptr;
603  if (FD->hasWrittenPrototype())
604  FT = dyn_cast<FunctionProtoType>(AFT);
605 
606  if (IK == FuncSig || IK == LFuncSig) {
607  switch (AFT->getCallConv()) {
608  case CC_C: POut << "__cdecl "; break;
609  case CC_X86StdCall: POut << "__stdcall "; break;
610  case CC_X86FastCall: POut << "__fastcall "; break;
611  case CC_X86ThisCall: POut << "__thiscall "; break;
612  case CC_X86VectorCall: POut << "__vectorcall "; break;
613  case CC_X86RegCall: POut << "__regcall "; break;
614  // Only bother printing the conventions that MSVC knows about.
615  default: break;
616  }
617  }
618 
619  FD->printQualifiedName(POut, Policy);
620 
621  POut << "(";
622  if (FT) {
623  for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
624  if (i) POut << ", ";
625  POut << Decl->getParamDecl(i)->getType().stream(Policy);
626  }
627 
628  if (FT->isVariadic()) {
629  if (FD->getNumParams()) POut << ", ";
630  POut << "...";
631  } else if ((IK == FuncSig || IK == LFuncSig ||
632  !Context.getLangOpts().CPlusPlus) &&
633  !Decl->getNumParams()) {
634  POut << "void";
635  }
636  }
637  POut << ")";
638 
639  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
640  assert(FT && "We must have a written prototype in this case.");
641  if (FT->isConst())
642  POut << " const";
643  if (FT->isVolatile())
644  POut << " volatile";
645  RefQualifierKind Ref = MD->getRefQualifier();
646  if (Ref == RQ_LValue)
647  POut << " &";
648  else if (Ref == RQ_RValue)
649  POut << " &&";
650  }
651 
653  SpecsTy Specs;
654  const DeclContext *Ctx = FD->getDeclContext();
655  while (Ctx && isa<NamedDecl>(Ctx)) {
657  = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
658  if (Spec && !Spec->isExplicitSpecialization())
659  Specs.push_back(Spec);
660  Ctx = Ctx->getParent();
661  }
662 
663  std::string TemplateParams;
664  llvm::raw_string_ostream TOut(TemplateParams);
665  for (SpecsTy::reverse_iterator I = Specs.rbegin(), E = Specs.rend();
666  I != E; ++I) {
667  const TemplateParameterList *Params
668  = (*I)->getSpecializedTemplate()->getTemplateParameters();
669  const TemplateArgumentList &Args = (*I)->getTemplateArgs();
670  assert(Params->size() == Args.size());
671  for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
672  StringRef Param = Params->getParam(i)->getName();
673  if (Param.empty()) continue;
674  TOut << Param << " = ";
675  Args.get(i).print(Policy, TOut);
676  TOut << ", ";
677  }
678  }
679 
681  = FD->getTemplateSpecializationInfo();
682  if (FSI && !FSI->isExplicitSpecialization()) {
683  const TemplateParameterList* Params
685  const TemplateArgumentList* Args = FSI->TemplateArguments;
686  assert(Params->size() == Args->size());
687  for (unsigned i = 0, e = Params->size(); i != e; ++i) {
688  StringRef Param = Params->getParam(i)->getName();
689  if (Param.empty()) continue;
690  TOut << Param << " = ";
691  Args->get(i).print(Policy, TOut);
692  TOut << ", ";
693  }
694  }
695 
696  TOut.flush();
697  if (!TemplateParams.empty()) {
698  // remove the trailing comma and space
699  TemplateParams.resize(TemplateParams.size() - 2);
700  POut << " [" << TemplateParams << "]";
701  }
702 
703  POut.flush();
704 
705  // Print "auto" for all deduced return types. This includes C++1y return
706  // type deduction and lambdas. For trailing return types resolve the
707  // decltype expression. Otherwise print the real type when this is
708  // not a constructor or destructor.
709  if (isa<CXXMethodDecl>(FD) &&
710  cast<CXXMethodDecl>(FD)->getParent()->isLambda())
711  Proto = "auto " + Proto;
712  else if (FT && FT->getReturnType()->getAs<DecltypeType>())
713  FT->getReturnType()
714  ->getAs<DecltypeType>()
716  .getAsStringInternal(Proto, Policy);
717  else if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
718  AFT->getReturnType().getAsStringInternal(Proto, Policy);
719 
720  Out << Proto;
721 
722  return Name.str().str();
723  }
724  if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(CurrentDecl)) {
725  for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
726  // Skip to its enclosing function or method, but not its enclosing
727  // CapturedDecl.
728  if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
729  const Decl *D = Decl::castFromDeclContext(DC);
730  return ComputeName(IK, D);
731  }
732  llvm_unreachable("CapturedDecl not inside a function or method");
733  }
734  if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
735  SmallString<256> Name;
736  llvm::raw_svector_ostream Out(Name);
737  Out << (MD->isInstanceMethod() ? '-' : '+');
738  Out << '[';
739 
740  // For incorrect code, there might not be an ObjCInterfaceDecl. Do
741  // a null check to avoid a crash.
742  if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
743  Out << *ID;
744 
745  if (const ObjCCategoryImplDecl *CID =
746  dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
747  Out << '(' << *CID << ')';
748 
749  Out << ' ';
750  MD->getSelector().print(Out);
751  Out << ']';
752 
753  return Name.str().str();
754  }
755  if (isa<TranslationUnitDecl>(CurrentDecl) && IK == PrettyFunction) {
756  // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
757  return "top level";
758  }
759  return "";
760 }
761 
763  const llvm::APInt &Val) {
764  if (hasAllocation())
765  C.Deallocate(pVal);
766 
767  BitWidth = Val.getBitWidth();
768  unsigned NumWords = Val.getNumWords();
769  const uint64_t* Words = Val.getRawData();
770  if (NumWords > 1) {
771  pVal = new (C) uint64_t[NumWords];
772  std::copy(Words, Words + NumWords, pVal);
773  } else if (NumWords == 1)
774  VAL = Words[0];
775  else
776  VAL = 0;
777 }
778 
779 IntegerLiteral::IntegerLiteral(const ASTContext &C, const llvm::APInt &V,
781  : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false,
782  false, false),
783  Loc(l) {
784  assert(type->isIntegerType() && "Illegal type in IntegerLiteral");
785  assert(V.getBitWidth() == C.getIntWidth(type) &&
786  "Integer type is not the correct size for constant.");
787  setValue(C, V);
788 }
789 
791 IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
793  return new (C) IntegerLiteral(C, V, type, l);
794 }
795 
798  return new (C) IntegerLiteral(Empty);
799 }
800 
801 FixedPointLiteral::FixedPointLiteral(const ASTContext &C, const llvm::APInt &V,
803  unsigned Scale)
804  : Expr(FixedPointLiteralClass, type, VK_RValue, OK_Ordinary, false, false,
805  false, false),
806  Loc(l), Scale(Scale) {
807  assert(type->isFixedPointType() && "Illegal type in FixedPointLiteral");
808  assert(V.getBitWidth() == C.getTypeInfo(type).Width &&
809  "Fixed point type is not the correct size for constant.");
810  setValue(C, V);
811 }
812 
814  const llvm::APInt &V,
815  QualType type,
816  SourceLocation l,
817  unsigned Scale) {
818  return new (C) FixedPointLiteral(C, V, type, l, Scale);
819 }
820 
821 std::string FixedPointLiteral::getValueAsString(unsigned Radix) const {
822  // Currently the longest decimal number that can be printed is the max for an
823  // unsigned long _Accum: 4294967295.99999999976716935634613037109375
824  // which is 43 characters.
825  SmallString<64> S;
827  S, llvm::APSInt::getUnsigned(getValue().getZExtValue()), Scale);
828  return S.str();
829 }
830 
831 FloatingLiteral::FloatingLiteral(const ASTContext &C, const llvm::APFloat &V,
832  bool isexact, QualType Type, SourceLocation L)
833  : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false,
834  false, false), Loc(L) {
835  setSemantics(V.getSemantics());
836  FloatingLiteralBits.IsExact = isexact;
837  setValue(C, V);
838 }
839 
840 FloatingLiteral::FloatingLiteral(const ASTContext &C, EmptyShell Empty)
841  : Expr(FloatingLiteralClass, Empty) {
842  setRawSemantics(IEEEhalf);
843  FloatingLiteralBits.IsExact = false;
844 }
845 
847 FloatingLiteral::Create(const ASTContext &C, const llvm::APFloat &V,
848  bool isexact, QualType Type, SourceLocation L) {
849  return new (C) FloatingLiteral(C, V, isexact, Type, L);
850 }
851 
854  return new (C) FloatingLiteral(C, Empty);
855 }
856 
857 const llvm::fltSemantics &FloatingLiteral::getSemantics() const {
858  switch(FloatingLiteralBits.Semantics) {
859  case IEEEhalf:
860  return llvm::APFloat::IEEEhalf();
861  case IEEEsingle:
862  return llvm::APFloat::IEEEsingle();
863  case IEEEdouble:
864  return llvm::APFloat::IEEEdouble();
865  case x87DoubleExtended:
866  return llvm::APFloat::x87DoubleExtended();
867  case IEEEquad:
868  return llvm::APFloat::IEEEquad();
869  case PPCDoubleDouble:
870  return llvm::APFloat::PPCDoubleDouble();
871  }
872  llvm_unreachable("Unrecognised floating semantics");
873 }
874 
875 void FloatingLiteral::setSemantics(const llvm::fltSemantics &Sem) {
876  if (&Sem == &llvm::APFloat::IEEEhalf())
877  FloatingLiteralBits.Semantics = IEEEhalf;
878  else if (&Sem == &llvm::APFloat::IEEEsingle())
879  FloatingLiteralBits.Semantics = IEEEsingle;
880  else if (&Sem == &llvm::APFloat::IEEEdouble())
881  FloatingLiteralBits.Semantics = IEEEdouble;
882  else if (&Sem == &llvm::APFloat::x87DoubleExtended())
884  else if (&Sem == &llvm::APFloat::IEEEquad())
885  FloatingLiteralBits.Semantics = IEEEquad;
886  else if (&Sem == &llvm::APFloat::PPCDoubleDouble())
888  else
889  llvm_unreachable("Unknown floating semantics");
890 }
891 
892 /// getValueAsApproximateDouble - This returns the value as an inaccurate
893 /// double. Note that this may cause loss of precision, but is useful for
894 /// debugging dumps, etc.
896  llvm::APFloat V = getValue();
897  bool ignored;
898  V.convert(llvm::APFloat::IEEEdouble(), llvm::APFloat::rmNearestTiesToEven,
899  &ignored);
900  return V.convertToDouble();
901 }
902 
903 unsigned StringLiteral::mapCharByteWidth(TargetInfo const &Target,
904  StringKind SK) {
905  unsigned CharByteWidth = 0;
906  switch (SK) {
907  case Ascii:
908  case UTF8:
909  CharByteWidth = Target.getCharWidth();
910  break;
911  case Wide:
912  CharByteWidth = Target.getWCharWidth();
913  break;
914  case UTF16:
915  CharByteWidth = Target.getChar16Width();
916  break;
917  case UTF32:
918  CharByteWidth = Target.getChar32Width();
919  break;
920  }
921  assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple");
922  CharByteWidth /= 8;
923  assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) &&
924  "The only supported character byte widths are 1,2 and 4!");
925  return CharByteWidth;
926 }
927 
928 StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
929  StringKind Kind, bool Pascal, QualType Ty,
930  const SourceLocation *Loc,
931  unsigned NumConcatenated)
932  : Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false,
933  false) {
934  assert(Ctx.getAsConstantArrayType(Ty) &&
935  "StringLiteral must be of constant array type!");
936  unsigned CharByteWidth = mapCharByteWidth(Ctx.getTargetInfo(), Kind);
937  unsigned ByteLength = Str.size();
938  assert((ByteLength % CharByteWidth == 0) &&
939  "The size of the data must be a multiple of CharByteWidth!");
940 
941  // Avoid the expensive division. The compiler should be able to figure it
942  // out by itself. However as of clang 7, even with the appropriate
943  // llvm_unreachable added just here, it is not able to do so.
944  unsigned Length;
945  switch (CharByteWidth) {
946  case 1:
947  Length = ByteLength;
948  break;
949  case 2:
950  Length = ByteLength / 2;
951  break;
952  case 4:
953  Length = ByteLength / 4;
954  break;
955  default:
956  llvm_unreachable("Unsupported character width!");
957  }
958 
959  StringLiteralBits.Kind = Kind;
960  StringLiteralBits.CharByteWidth = CharByteWidth;
961  StringLiteralBits.IsPascal = Pascal;
962  StringLiteralBits.NumConcatenated = NumConcatenated;
963  *getTrailingObjects<unsigned>() = Length;
964 
965  // Initialize the trailing array of SourceLocation.
966  // This is safe since SourceLocation is POD-like.
967  std::memcpy(getTrailingObjects<SourceLocation>(), Loc,
968  NumConcatenated * sizeof(SourceLocation));
969 
970  // Initialize the trailing array of char holding the string data.
971  std::memcpy(getTrailingObjects<char>(), Str.data(), ByteLength);
972 }
973 
974 StringLiteral::StringLiteral(EmptyShell Empty, unsigned NumConcatenated,
975  unsigned Length, unsigned CharByteWidth)
976  : Expr(StringLiteralClass, Empty) {
977  StringLiteralBits.CharByteWidth = CharByteWidth;
978  StringLiteralBits.NumConcatenated = NumConcatenated;
979  *getTrailingObjects<unsigned>() = Length;
980 }
981 
982 StringLiteral *StringLiteral::Create(const ASTContext &Ctx, StringRef Str,
983  StringKind Kind, bool Pascal, QualType Ty,
984  const SourceLocation *Loc,
985  unsigned NumConcatenated) {
986  void *Mem = Ctx.Allocate(totalSizeToAlloc<unsigned, SourceLocation, char>(
987  1, NumConcatenated, Str.size()),
988  alignof(StringLiteral));
989  return new (Mem)
990  StringLiteral(Ctx, Str, Kind, Pascal, Ty, Loc, NumConcatenated);
991 }
992 
994  unsigned NumConcatenated,
995  unsigned Length,
996  unsigned CharByteWidth) {
997  void *Mem = Ctx.Allocate(totalSizeToAlloc<unsigned, SourceLocation, char>(
998  1, NumConcatenated, Length * CharByteWidth),
999  alignof(StringLiteral));
1000  return new (Mem)
1001  StringLiteral(EmptyShell(), NumConcatenated, Length, CharByteWidth);
1002 }
1003 
1004 void StringLiteral::outputString(raw_ostream &OS) const {
1005  switch (getKind()) {
1006  case Ascii: break; // no prefix.
1007  case Wide: OS << 'L'; break;
1008  case UTF8: OS << "u8"; break;
1009  case UTF16: OS << 'u'; break;
1010  case UTF32: OS << 'U'; break;
1011  }
1012  OS << '"';
1013  static const char Hex[] = "0123456789ABCDEF";
1014 
1015  unsigned LastSlashX = getLength();
1016  for (unsigned I = 0, N = getLength(); I != N; ++I) {
1017  switch (uint32_t Char = getCodeUnit(I)) {
1018  default:
1019  // FIXME: Convert UTF-8 back to codepoints before rendering.
1020 
1021  // Convert UTF-16 surrogate pairs back to codepoints before rendering.
1022  // Leave invalid surrogates alone; we'll use \x for those.
1023  if (getKind() == UTF16 && I != N - 1 && Char >= 0xd800 &&
1024  Char <= 0xdbff) {
1025  uint32_t Trail = getCodeUnit(I + 1);
1026  if (Trail >= 0xdc00 && Trail <= 0xdfff) {
1027  Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00);
1028  ++I;
1029  }
1030  }
1031 
1032  if (Char > 0xff) {
1033  // If this is a wide string, output characters over 0xff using \x
1034  // escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a
1035  // codepoint: use \x escapes for invalid codepoints.
1036  if (getKind() == Wide ||
1037  (Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) {
1038  // FIXME: Is this the best way to print wchar_t?
1039  OS << "\\x";
1040  int Shift = 28;
1041  while ((Char >> Shift) == 0)
1042  Shift -= 4;
1043  for (/**/; Shift >= 0; Shift -= 4)
1044  OS << Hex[(Char >> Shift) & 15];
1045  LastSlashX = I;
1046  break;
1047  }
1048 
1049  if (Char > 0xffff)
1050  OS << "\\U00"
1051  << Hex[(Char >> 20) & 15]
1052  << Hex[(Char >> 16) & 15];
1053  else
1054  OS << "\\u";
1055  OS << Hex[(Char >> 12) & 15]
1056  << Hex[(Char >> 8) & 15]
1057  << Hex[(Char >> 4) & 15]
1058  << Hex[(Char >> 0) & 15];
1059  break;
1060  }
1061 
1062  // If we used \x... for the previous character, and this character is a
1063  // hexadecimal digit, prevent it being slurped as part of the \x.
1064  if (LastSlashX + 1 == I) {
1065  switch (Char) {
1066  case '0': case '1': case '2': case '3': case '4':
1067  case '5': case '6': case '7': case '8': case '9':
1068  case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
1069  case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
1070  OS << "\"\"";
1071  }
1072  }
1073 
1074  assert(Char <= 0xff &&
1075  "Characters above 0xff should already have been handled.");
1076 
1077  if (isPrintable(Char))
1078  OS << (char)Char;
1079  else // Output anything hard as an octal escape.
1080  OS << '\\'
1081  << (char)('0' + ((Char >> 6) & 7))
1082  << (char)('0' + ((Char >> 3) & 7))
1083  << (char)('0' + ((Char >> 0) & 7));
1084  break;
1085  // Handle some common non-printable cases to make dumps prettier.
1086  case '\\': OS << "\\\\"; break;
1087  case '"': OS << "\\\""; break;
1088  case '\a': OS << "\\a"; break;
1089  case '\b': OS << "\\b"; break;
1090  case '\f': OS << "\\f"; break;
1091  case '\n': OS << "\\n"; break;
1092  case '\r': OS << "\\r"; break;
1093  case '\t': OS << "\\t"; break;
1094  case '\v': OS << "\\v"; break;
1095  }
1096  }
1097  OS << '"';
1098 }
1099 
1100 /// getLocationOfByte - Return a source location that points to the specified
1101 /// byte of this string literal.
1102 ///
1103 /// Strings are amazingly complex. They can be formed from multiple tokens and
1104 /// can have escape sequences in them in addition to the usual trigraph and
1105 /// escaped newline business. This routine handles this complexity.
1106 ///
1107 /// The *StartToken sets the first token to be searched in this function and
1108 /// the *StartTokenByteOffset is the byte offset of the first token. Before
1109 /// returning, it updates the *StartToken to the TokNo of the token being found
1110 /// and sets *StartTokenByteOffset to the byte offset of the token in the
1111 /// string.
1112 /// Using these two parameters can reduce the time complexity from O(n^2) to
1113 /// O(n) if one wants to get the location of byte for all the tokens in a
1114 /// string.
1115 ///
1118  const LangOptions &Features,
1119  const TargetInfo &Target, unsigned *StartToken,
1120  unsigned *StartTokenByteOffset) const {
1121  assert((getKind() == StringLiteral::Ascii ||
1122  getKind() == StringLiteral::UTF8) &&
1123  "Only narrow string literals are currently supported");
1124 
1125  // Loop over all of the tokens in this string until we find the one that
1126  // contains the byte we're looking for.
1127  unsigned TokNo = 0;
1128  unsigned StringOffset = 0;
1129  if (StartToken)
1130  TokNo = *StartToken;
1131  if (StartTokenByteOffset) {
1132  StringOffset = *StartTokenByteOffset;
1133  ByteNo -= StringOffset;
1134  }
1135  while (1) {
1136  assert(TokNo < getNumConcatenated() && "Invalid byte number!");
1137  SourceLocation StrTokLoc = getStrTokenLoc(TokNo);
1138 
1139  // Get the spelling of the string so that we can get the data that makes up
1140  // the string literal, not the identifier for the macro it is potentially
1141  // expanded through.
1142  SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc);
1143 
1144  // Re-lex the token to get its length and original spelling.
1145  std::pair<FileID, unsigned> LocInfo =
1146  SM.getDecomposedLoc(StrTokSpellingLoc);
1147  bool Invalid = false;
1148  StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
1149  if (Invalid) {
1150  if (StartTokenByteOffset != nullptr)
1151  *StartTokenByteOffset = StringOffset;
1152  if (StartToken != nullptr)
1153  *StartToken = TokNo;
1154  return StrTokSpellingLoc;
1155  }
1156 
1157  const char *StrData = Buffer.data()+LocInfo.second;
1158 
1159  // Create a lexer starting at the beginning of this token.
1160  Lexer TheLexer(SM.getLocForStartOfFile(LocInfo.first), Features,
1161  Buffer.begin(), StrData, Buffer.end());
1162  Token TheTok;
1163  TheLexer.LexFromRawLexer(TheTok);
1164 
1165  // Use the StringLiteralParser to compute the length of the string in bytes.
1166  StringLiteralParser SLP(TheTok, SM, Features, Target);
1167  unsigned TokNumBytes = SLP.GetStringLength();
1168 
1169  // If the byte is in this token, return the location of the byte.
1170  if (ByteNo < TokNumBytes ||
1171  (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
1172  unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
1173 
1174  // Now that we know the offset of the token in the spelling, use the
1175  // preprocessor to get the offset in the original source.
1176  if (StartTokenByteOffset != nullptr)
1177  *StartTokenByteOffset = StringOffset;
1178  if (StartToken != nullptr)
1179  *StartToken = TokNo;
1180  return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features);
1181  }
1182 
1183  // Move to the next string token.
1184  StringOffset += TokNumBytes;
1185  ++TokNo;
1186  ByteNo -= TokNumBytes;
1187  }
1188 }
1189 
1190 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1191 /// corresponds to, e.g. "sizeof" or "[pre]++".
1193  switch (Op) {
1194 #define UNARY_OPERATION(Name, Spelling) case UO_##Name: return Spelling;
1195 #include "clang/AST/OperationKinds.def"
1196  }
1197  llvm_unreachable("Unknown unary operator");
1198 }
1199 
1202  switch (OO) {
1203  default: llvm_unreachable("No unary operator for overloaded function");
1204  case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
1205  case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
1206  case OO_Amp: return UO_AddrOf;
1207  case OO_Star: return UO_Deref;
1208  case OO_Plus: return UO_Plus;
1209  case OO_Minus: return UO_Minus;
1210  case OO_Tilde: return UO_Not;
1211  case OO_Exclaim: return UO_LNot;
1212  case OO_Coawait: return UO_Coawait;
1213  }
1214 }
1215 
1217  switch (Opc) {
1218  case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
1219  case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
1220  case UO_AddrOf: return OO_Amp;
1221  case UO_Deref: return OO_Star;
1222  case UO_Plus: return OO_Plus;
1223  case UO_Minus: return OO_Minus;
1224  case UO_Not: return OO_Tilde;
1225  case UO_LNot: return OO_Exclaim;
1226  case UO_Coawait: return OO_Coawait;
1227  default: return OO_None;
1228  }
1229 }
1230 
1231 
1232 //===----------------------------------------------------------------------===//
1233 // Postfix Operators.
1234 //===----------------------------------------------------------------------===//
1235 
1238  SourceLocation RParenLoc, unsigned MinNumArgs,
1239  ADLCallKind UsesADL)
1240  : Expr(SC, Ty, VK, OK_Ordinary, Fn->isTypeDependent(),
1243  RParenLoc(RParenLoc) {
1244  NumArgs = std::max<unsigned>(Args.size(), MinNumArgs);
1245  unsigned NumPreArgs = PreArgs.size();
1246  CallExprBits.NumPreArgs = NumPreArgs;
1247  assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1248 
1249  unsigned OffsetToTrailingObjects = offsetToTrailingObjects(SC);
1250  CallExprBits.OffsetToTrailingObjects = OffsetToTrailingObjects;
1251  assert((CallExprBits.OffsetToTrailingObjects == OffsetToTrailingObjects) &&
1252  "OffsetToTrailingObjects overflow!");
1253 
1254  CallExprBits.UsesADL = static_cast<bool>(UsesADL);
1255 
1256  setCallee(Fn);
1257  for (unsigned I = 0; I != NumPreArgs; ++I) {
1258  updateDependenciesFromArg(PreArgs[I]);
1259  setPreArg(I, PreArgs[I]);
1260  }
1261  for (unsigned I = 0; I != Args.size(); ++I) {
1262  updateDependenciesFromArg(Args[I]);
1263  setArg(I, Args[I]);
1264  }
1265  for (unsigned I = Args.size(); I != NumArgs; ++I) {
1266  setArg(I, nullptr);
1267  }
1268 }
1269 
1270 CallExpr::CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
1271  EmptyShell Empty)
1272  : Expr(SC, Empty), NumArgs(NumArgs) {
1273  CallExprBits.NumPreArgs = NumPreArgs;
1274  assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1275 
1276  unsigned OffsetToTrailingObjects = offsetToTrailingObjects(SC);
1277  CallExprBits.OffsetToTrailingObjects = OffsetToTrailingObjects;
1278  assert((CallExprBits.OffsetToTrailingObjects == OffsetToTrailingObjects) &&
1279  "OffsetToTrailingObjects overflow!");
1280 }
1281 
1284  SourceLocation RParenLoc, unsigned MinNumArgs,
1285  ADLCallKind UsesADL) {
1286  unsigned NumArgs = std::max<unsigned>(Args.size(), MinNumArgs);
1287  unsigned SizeOfTrailingObjects =
1288  CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
1289  void *Mem =
1290  Ctx.Allocate(sizeof(CallExpr) + SizeOfTrailingObjects, alignof(CallExpr));
1291  return new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
1292  RParenLoc, MinNumArgs, UsesADL);
1293 }
1294 
1296  ExprValueKind VK, SourceLocation RParenLoc,
1297  ADLCallKind UsesADL) {
1298  assert(!(reinterpret_cast<uintptr_t>(Mem) % alignof(CallExpr)) &&
1299  "Misaligned memory in CallExpr::CreateTemporary!");
1300  return new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, /*Args=*/{}, Ty,
1301  VK, RParenLoc, /*MinNumArgs=*/0, UsesADL);
1302 }
1303 
1304 CallExpr *CallExpr::CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
1305  EmptyShell Empty) {
1306  unsigned SizeOfTrailingObjects =
1307  CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs);
1308  void *Mem =
1309  Ctx.Allocate(sizeof(CallExpr) + SizeOfTrailingObjects, alignof(CallExpr));
1310  return new (Mem) CallExpr(CallExprClass, /*NumPreArgs=*/0, NumArgs, Empty);
1311 }
1312 
1313 unsigned CallExpr::offsetToTrailingObjects(StmtClass SC) {
1314  switch (SC) {
1315  case CallExprClass:
1316  return sizeof(CallExpr);
1317  case CXXOperatorCallExprClass:
1318  return sizeof(CXXOperatorCallExpr);
1319  case CXXMemberCallExprClass:
1320  return sizeof(CXXMemberCallExpr);
1321  case UserDefinedLiteralClass:
1322  return sizeof(UserDefinedLiteral);
1323  case CUDAKernelCallExprClass:
1324  return sizeof(CUDAKernelCallExpr);
1325  default:
1326  llvm_unreachable("unexpected class deriving from CallExpr!");
1327  }
1328 }
1329 
1330 void CallExpr::updateDependenciesFromArg(Expr *Arg) {
1331  if (Arg->isTypeDependent())
1332  ExprBits.TypeDependent = true;
1333  if (Arg->isValueDependent())
1334  ExprBits.ValueDependent = true;
1335  if (Arg->isInstantiationDependent())
1336  ExprBits.InstantiationDependent = true;
1338  ExprBits.ContainsUnexpandedParameterPack = true;
1339 }
1340 
1342  Expr *CEE = IgnoreParenImpCasts();
1343 
1344  while (SubstNonTypeTemplateParmExpr *NTTP
1345  = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) {
1346  CEE = NTTP->getReplacement()->IgnoreParenCasts();
1347  }
1348 
1349  // If we're calling a dereference, look at the pointer instead.
1350  if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) {
1351  if (BO->isPtrMemOp())
1352  CEE = BO->getRHS()->IgnoreParenCasts();
1353  } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) {
1354  if (UO->getOpcode() == UO_Deref)
1355  CEE = UO->getSubExpr()->IgnoreParenCasts();
1356  }
1357  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
1358  return DRE->getDecl();
1359  if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
1360  return ME->getMemberDecl();
1361  if (auto *BE = dyn_cast<BlockExpr>(CEE))
1362  return BE->getBlockDecl();
1363 
1364  return nullptr;
1365 }
1366 
1367 /// getBuiltinCallee - If this is a call to a builtin, return the builtin ID. If
1368 /// not, return 0.
1369 unsigned CallExpr::getBuiltinCallee() const {
1370  // All simple function calls (e.g. func()) are implicitly cast to pointer to
1371  // function. As a result, we try and obtain the DeclRefExpr from the
1372  // ImplicitCastExpr.
1373  const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
1374  if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
1375  return 0;
1376 
1377  const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
1378  if (!DRE)
1379  return 0;
1380 
1381  const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
1382  if (!FDecl)
1383  return 0;
1384 
1385  if (!FDecl->getIdentifier())
1386  return 0;
1387 
1388  return FDecl->getBuiltinID();
1389 }
1390 
1392  if (unsigned BI = getBuiltinCallee())
1393  return Ctx.BuiltinInfo.isUnevaluated(BI);
1394  return false;
1395 }
1396 
1398  const Expr *Callee = getCallee();
1399  QualType CalleeType = Callee->getType();
1400  if (const auto *FnTypePtr = CalleeType->getAs<PointerType>()) {
1401  CalleeType = FnTypePtr->getPointeeType();
1402  } else if (const auto *BPT = CalleeType->getAs<BlockPointerType>()) {
1403  CalleeType = BPT->getPointeeType();
1404  } else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) {
1405  if (isa<CXXPseudoDestructorExpr>(Callee->IgnoreParens()))
1406  return Ctx.VoidTy;
1407 
1408  // This should never be overloaded and so should never return null.
1409  CalleeType = Expr::findBoundMemberType(Callee);
1410  }
1411 
1412  const FunctionType *FnType = CalleeType->castAs<FunctionType>();
1413  return FnType->getReturnType();
1414 }
1415 
1417  // If the return type is a struct, union, or enum that is marked nodiscard,
1418  // then return the return type attribute.
1419  if (const TagDecl *TD = getCallReturnType(Ctx)->getAsTagDecl())
1420  if (const auto *A = TD->getAttr<WarnUnusedResultAttr>())
1421  return A;
1422 
1423  // Otherwise, see if the callee is marked nodiscard and return that attribute
1424  // instead.
1425  const Decl *D = getCalleeDecl();
1426  return D ? D->getAttr<WarnUnusedResultAttr>() : nullptr;
1427 }
1428 
1430  if (isa<CXXOperatorCallExpr>(this))
1431  return cast<CXXOperatorCallExpr>(this)->getBeginLoc();
1432 
1433  SourceLocation begin = getCallee()->getBeginLoc();
1434  if (begin.isInvalid() && getNumArgs() > 0 && getArg(0))
1435  begin = getArg(0)->getBeginLoc();
1436  return begin;
1437 }
1439  if (isa<CXXOperatorCallExpr>(this))
1440  return cast<CXXOperatorCallExpr>(this)->getEndLoc();
1441 
1442  SourceLocation end = getRParenLoc();
1443  if (end.isInvalid() && getNumArgs() > 0 && getArg(getNumArgs() - 1))
1444  end = getArg(getNumArgs() - 1)->getEndLoc();
1445  return end;
1446 }
1447 
1449  SourceLocation OperatorLoc,
1450  TypeSourceInfo *tsi,
1451  ArrayRef<OffsetOfNode> comps,
1452  ArrayRef<Expr*> exprs,
1453  SourceLocation RParenLoc) {
1454  void *Mem = C.Allocate(
1455  totalSizeToAlloc<OffsetOfNode, Expr *>(comps.size(), exprs.size()));
1456 
1457  return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, comps, exprs,
1458  RParenLoc);
1459 }
1460 
1462  unsigned numComps, unsigned numExprs) {
1463  void *Mem =
1464  C.Allocate(totalSizeToAlloc<OffsetOfNode, Expr *>(numComps, numExprs));
1465  return new (Mem) OffsetOfExpr(numComps, numExprs);
1466 }
1467 
1468 OffsetOfExpr::OffsetOfExpr(const ASTContext &C, QualType type,
1469  SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1471  SourceLocation RParenLoc)
1472  : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary,
1473  /*TypeDependent=*/false,
1474  /*ValueDependent=*/tsi->getType()->isDependentType(),
1477  OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
1478  NumComps(comps.size()), NumExprs(exprs.size())
1479 {
1480  for (unsigned i = 0; i != comps.size(); ++i) {
1481  setComponent(i, comps[i]);
1482  }
1483 
1484  for (unsigned i = 0; i != exprs.size(); ++i) {
1485  if (exprs[i]->isTypeDependent() || exprs[i]->isValueDependent())
1486  ExprBits.ValueDependent = true;
1487  if (exprs[i]->containsUnexpandedParameterPack())
1488  ExprBits.ContainsUnexpandedParameterPack = true;
1489 
1490  setIndexExpr(i, exprs[i]);
1491  }
1492 }
1493 
1495  assert(getKind() == Field || getKind() == Identifier);
1496  if (getKind() == Field)
1497  return getField()->getIdentifier();
1498 
1499  return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
1500 }
1501 
1503  UnaryExprOrTypeTrait ExprKind, Expr *E, QualType resultType,
1505  : Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary,
1506  false, // Never type-dependent (C++ [temp.dep.expr]p3).
1507  // Value-dependent if the argument is type-dependent.
1510  OpLoc(op), RParenLoc(rp) {
1511  UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1512  UnaryExprOrTypeTraitExprBits.IsType = false;
1513  Argument.Ex = E;
1514 
1515  // Check to see if we are in the situation where alignof(decl) should be
1516  // dependent because decl's alignment is dependent.
1517  if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
1519  E = E->IgnoreParens();
1520 
1521  const ValueDecl *D = nullptr;
1522  if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
1523  D = DRE->getDecl();
1524  else if (const auto *ME = dyn_cast<MemberExpr>(E))
1525  D = ME->getMemberDecl();
1526 
1527  if (D) {
1528  for (const auto *I : D->specific_attrs<AlignedAttr>()) {
1529  if (I->isAlignmentDependent()) {
1530  setValueDependent(true);
1532  break;
1533  }
1534  }
1535  }
1536  }
1537  }
1538 }
1539 
1541  const ASTContext &C, Expr *base, bool isarrow, SourceLocation OperatorLoc,
1542  NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1543  ValueDecl *memberdecl, DeclAccessPair founddecl,
1544  DeclarationNameInfo nameinfo, const TemplateArgumentListInfo *targs,
1545  QualType ty, ExprValueKind vk, ExprObjectKind ok) {
1546 
1547  bool hasQualOrFound = (QualifierLoc ||
1548  founddecl.getDecl() != memberdecl ||
1549  founddecl.getAccess() != memberdecl->getAccess());
1550 
1551  bool HasTemplateKWAndArgsInfo = targs || TemplateKWLoc.isValid();
1552  std::size_t Size =
1554  TemplateArgumentLoc>(hasQualOrFound ? 1 : 0,
1555  HasTemplateKWAndArgsInfo ? 1 : 0,
1556  targs ? targs->size() : 0);
1557 
1558  void *Mem = C.Allocate(Size, alignof(MemberExpr));
1559  MemberExpr *E = new (Mem)
1560  MemberExpr(base, isarrow, OperatorLoc, memberdecl, nameinfo, ty, vk, ok);
1561 
1562  if (hasQualOrFound) {
1563  // FIXME: Wrong. We should be looking at the member declaration we found.
1564  if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) {
1565  E->setValueDependent(true);
1566  E->setTypeDependent(true);
1567  E->setInstantiationDependent(true);
1568  }
1569  else if (QualifierLoc &&
1571  E->setInstantiationDependent(true);
1572 
1573  E->MemberExprBits.HasQualifierOrFoundDecl = true;
1574 
1575  MemberExprNameQualifier *NQ =
1576  E->getTrailingObjects<MemberExprNameQualifier>();
1577  NQ->QualifierLoc = QualifierLoc;
1578  NQ->FoundDecl = founddecl;
1579  }
1580 
1581  E->MemberExprBits.HasTemplateKWAndArgsInfo =
1582  (targs || TemplateKWLoc.isValid());
1583 
1584  if (targs) {
1585  bool Dependent = false;
1586  bool InstantiationDependent = false;
1587  bool ContainsUnexpandedParameterPack = false;
1588  E->getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1589  TemplateKWLoc, *targs, E->getTrailingObjects<TemplateArgumentLoc>(),
1590  Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
1591  if (InstantiationDependent)
1592  E->setInstantiationDependent(true);
1593  } else if (TemplateKWLoc.isValid()) {
1594  E->getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1595  TemplateKWLoc);
1596  }
1597 
1598  return E;
1599 }
1600 
1602  if (isImplicitAccess()) {
1603  if (hasQualifier())
1604  return getQualifierLoc().getBeginLoc();
1605  return MemberLoc;
1606  }
1607 
1608  // FIXME: We don't want this to happen. Rather, we should be able to
1609  // detect all kinds of implicit accesses more cleanly.
1610  SourceLocation BaseStartLoc = getBase()->getBeginLoc();
1611  if (BaseStartLoc.isValid())
1612  return BaseStartLoc;
1613  return MemberLoc;
1614 }
1616  SourceLocation EndLoc = getMemberNameInfo().getEndLoc();
1617  if (hasExplicitTemplateArgs())
1618  EndLoc = getRAngleLoc();
1619  else if (EndLoc.isInvalid())
1620  EndLoc = getBase()->getEndLoc();
1621  return EndLoc;
1622 }
1623 
1624 bool CastExpr::CastConsistency() const {
1625  switch (getCastKind()) {
1626  case CK_DerivedToBase:
1627  case CK_UncheckedDerivedToBase:
1628  case CK_DerivedToBaseMemberPointer:
1629  case CK_BaseToDerived:
1630  case CK_BaseToDerivedMemberPointer:
1631  assert(!path_empty() && "Cast kind should have a base path!");
1632  break;
1633 
1634  case CK_CPointerToObjCPointerCast:
1635  assert(getType()->isObjCObjectPointerType());
1636  assert(getSubExpr()->getType()->isPointerType());
1637  goto CheckNoBasePath;
1638 
1639  case CK_BlockPointerToObjCPointerCast:
1640  assert(getType()->isObjCObjectPointerType());
1641  assert(getSubExpr()->getType()->isBlockPointerType());
1642  goto CheckNoBasePath;
1643 
1644  case CK_ReinterpretMemberPointer:
1645  assert(getType()->isMemberPointerType());
1646  assert(getSubExpr()->getType()->isMemberPointerType());
1647  goto CheckNoBasePath;
1648 
1649  case CK_BitCast:
1650  // Arbitrary casts to C pointer types count as bitcasts.
1651  // Otherwise, we should only have block and ObjC pointer casts
1652  // here if they stay within the type kind.
1653  if (!getType()->isPointerType()) {
1654  assert(getType()->isObjCObjectPointerType() ==
1655  getSubExpr()->getType()->isObjCObjectPointerType());
1656  assert(getType()->isBlockPointerType() ==
1657  getSubExpr()->getType()->isBlockPointerType());
1658  }
1659  goto CheckNoBasePath;
1660 
1661  case CK_AnyPointerToBlockPointerCast:
1662  assert(getType()->isBlockPointerType());
1663  assert(getSubExpr()->getType()->isAnyPointerType() &&
1664  !getSubExpr()->getType()->isBlockPointerType());
1665  goto CheckNoBasePath;
1666 
1667  case CK_CopyAndAutoreleaseBlockObject:
1668  assert(getType()->isBlockPointerType());
1669  assert(getSubExpr()->getType()->isBlockPointerType());
1670  goto CheckNoBasePath;
1671 
1672  case CK_FunctionToPointerDecay:
1673  assert(getType()->isPointerType());
1674  assert(getSubExpr()->getType()->isFunctionType());
1675  goto CheckNoBasePath;
1676 
1677  case CK_AddressSpaceConversion: {
1678  auto Ty = getType();
1679  auto SETy = getSubExpr()->getType();
1680  assert(getValueKindForType(Ty) == Expr::getValueKindForType(SETy));
1681  if (/*isRValue()*/ !Ty->getPointeeType().isNull()) {
1682  Ty = Ty->getPointeeType();
1683  SETy = SETy->getPointeeType();
1684  }
1685  assert(!Ty.isNull() && !SETy.isNull() &&
1686  Ty.getAddressSpace() != SETy.getAddressSpace());
1687  goto CheckNoBasePath;
1688  }
1689  // These should not have an inheritance path.
1690  case CK_Dynamic:
1691  case CK_ToUnion:
1692  case CK_ArrayToPointerDecay:
1693  case CK_NullToMemberPointer:
1694  case CK_NullToPointer:
1695  case CK_ConstructorConversion:
1696  case CK_IntegralToPointer:
1697  case CK_PointerToIntegral:
1698  case CK_ToVoid:
1699  case CK_VectorSplat:
1700  case CK_IntegralCast:
1701  case CK_BooleanToSignedIntegral:
1702  case CK_IntegralToFloating:
1703  case CK_FloatingToIntegral:
1704  case CK_FloatingCast:
1705  case CK_ObjCObjectLValueCast:
1706  case CK_FloatingRealToComplex:
1707  case CK_FloatingComplexToReal:
1708  case CK_FloatingComplexCast:
1709  case CK_FloatingComplexToIntegralComplex:
1710  case CK_IntegralRealToComplex:
1711  case CK_IntegralComplexToReal:
1712  case CK_IntegralComplexCast:
1713  case CK_IntegralComplexToFloatingComplex:
1714  case CK_ARCProduceObject:
1715  case CK_ARCConsumeObject:
1716  case CK_ARCReclaimReturnedObject:
1717  case CK_ARCExtendBlockObject:
1718  case CK_ZeroToOCLOpaqueType:
1719  case CK_IntToOCLSampler:
1720  case CK_FixedPointCast:
1721  case CK_FixedPointToIntegral:
1722  case CK_IntegralToFixedPoint:
1723  assert(!getType()->isBooleanType() && "unheralded conversion to bool");
1724  goto CheckNoBasePath;
1725 
1726  case CK_Dependent:
1727  case CK_LValueToRValue:
1728  case CK_NoOp:
1729  case CK_AtomicToNonAtomic:
1730  case CK_NonAtomicToAtomic:
1731  case CK_PointerToBoolean:
1732  case CK_IntegralToBoolean:
1733  case CK_FloatingToBoolean:
1734  case CK_MemberPointerToBoolean:
1735  case CK_FloatingComplexToBoolean:
1736  case CK_IntegralComplexToBoolean:
1737  case CK_LValueBitCast: // -> bool&
1738  case CK_UserDefinedConversion: // operator bool()
1739  case CK_BuiltinFnToFnPtr:
1740  case CK_FixedPointToBoolean:
1741  CheckNoBasePath:
1742  assert(path_empty() && "Cast kind should not have a base path!");
1743  break;
1744  }
1745  return true;
1746 }
1747 
1749  switch (CK) {
1750 #define CAST_OPERATION(Name) case CK_##Name: return #Name;
1751 #include "clang/AST/OperationKinds.def"
1752  }
1753  llvm_unreachable("Unhandled cast kind!");
1754 }
1755 
1756 namespace {
1757  const Expr *skipImplicitTemporary(const Expr *E) {
1758  // Skip through reference binding to temporary.
1759  if (auto *Materialize = dyn_cast<MaterializeTemporaryExpr>(E))
1760  E = Materialize->GetTemporaryExpr();
1761 
1762  // Skip any temporary bindings; they're implicit.
1763  if (auto *Binder = dyn_cast<CXXBindTemporaryExpr>(E))
1764  E = Binder->getSubExpr();
1765 
1766  return E;
1767  }
1768 }
1769 
1771  const Expr *SubExpr = nullptr;
1772  const CastExpr *E = this;
1773  do {
1774  SubExpr = skipImplicitTemporary(E->getSubExpr());
1775 
1776  // Conversions by constructor and conversion functions have a
1777  // subexpression describing the call; strip it off.
1778  if (E->getCastKind() == CK_ConstructorConversion)
1779  SubExpr =
1780  skipImplicitTemporary(cast<CXXConstructExpr>(SubExpr)->getArg(0));
1781  else if (E->getCastKind() == CK_UserDefinedConversion) {
1782  assert((isa<CXXMemberCallExpr>(SubExpr) ||
1783  isa<BlockExpr>(SubExpr)) &&
1784  "Unexpected SubExpr for CK_UserDefinedConversion.");
1785  if (auto *MCE = dyn_cast<CXXMemberCallExpr>(SubExpr))
1786  SubExpr = MCE->getImplicitObjectArgument();
1787  }
1788 
1789  // If the subexpression we're left with is an implicit cast, look
1790  // through that, too.
1791  } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));
1792 
1793  return const_cast<Expr*>(SubExpr);
1794 }
1795 
1797  const Expr *SubExpr = nullptr;
1798 
1799  for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(SubExpr)) {
1800  SubExpr = skipImplicitTemporary(E->getSubExpr());
1801 
1802  if (E->getCastKind() == CK_ConstructorConversion)
1803  return cast<CXXConstructExpr>(SubExpr)->getConstructor();
1804 
1805  if (E->getCastKind() == CK_UserDefinedConversion) {
1806  if (auto *MCE = dyn_cast<CXXMemberCallExpr>(SubExpr))
1807  return MCE->getMethodDecl();
1808  }
1809  }
1810 
1811  return nullptr;
1812 }
1813 
1814 CXXBaseSpecifier **CastExpr::path_buffer() {
1815  switch (getStmtClass()) {
1816 #define ABSTRACT_STMT(x)
1817 #define CASTEXPR(Type, Base) \
1818  case Stmt::Type##Class: \
1819  return static_cast<Type *>(this)->getTrailingObjects<CXXBaseSpecifier *>();
1820 #define STMT(Type, Base)
1821 #include "clang/AST/StmtNodes.inc"
1822  default:
1823  llvm_unreachable("non-cast expressions not possible here");
1824  }
1825 }
1826 
1828  QualType opType) {
1829  auto RD = unionType->castAs<RecordType>()->getDecl();
1830  return getTargetFieldForToUnionCast(RD, opType);
1831 }
1832 
1834  QualType OpType) {
1835  auto &Ctx = RD->getASTContext();
1836  RecordDecl::field_iterator Field, FieldEnd;
1837  for (Field = RD->field_begin(), FieldEnd = RD->field_end();
1838  Field != FieldEnd; ++Field) {
1839  if (Ctx.hasSameUnqualifiedType(Field->getType(), OpType) &&
1840  !Field->isUnnamedBitfield()) {
1841  return *Field;
1842  }
1843  }
1844  return nullptr;
1845 }
1846 
1848  CastKind Kind, Expr *Operand,
1849  const CXXCastPath *BasePath,
1850  ExprValueKind VK) {
1851  unsigned PathSize = (BasePath ? BasePath->size() : 0);
1852  void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1853  ImplicitCastExpr *E =
1854  new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK);
1855  if (PathSize)
1856  std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
1857  E->getTrailingObjects<CXXBaseSpecifier *>());
1858  return E;
1859 }
1860 
1862  unsigned PathSize) {
1863  void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1864  return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize);
1865 }
1866 
1867 
1869  ExprValueKind VK, CastKind K, Expr *Op,
1870  const CXXCastPath *BasePath,
1871  TypeSourceInfo *WrittenTy,
1873  unsigned PathSize = (BasePath ? BasePath->size() : 0);
1874  void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1875  CStyleCastExpr *E =
1876  new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R);
1877  if (PathSize)
1878  std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
1879  E->getTrailingObjects<CXXBaseSpecifier *>());
1880  return E;
1881 }
1882 
1884  unsigned PathSize) {
1885  void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1886  return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize);
1887 }
1888 
1889 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1890 /// corresponds to, e.g. "<<=".
1892  switch (Op) {
1893 #define BINARY_OPERATION(Name, Spelling) case BO_##Name: return Spelling;
1894 #include "clang/AST/OperationKinds.def"
1895  }
1896  llvm_unreachable("Invalid OpCode!");
1897 }
1898 
1901  switch (OO) {
1902  default: llvm_unreachable("Not an overloadable binary operator");
1903  case OO_Plus: return BO_Add;
1904  case OO_Minus: return BO_Sub;
1905  case OO_Star: return BO_Mul;
1906  case OO_Slash: return BO_Div;
1907  case OO_Percent: return BO_Rem;
1908  case OO_Caret: return BO_Xor;
1909  case OO_Amp: return BO_And;
1910  case OO_Pipe: return BO_Or;
1911  case OO_Equal: return BO_Assign;
1912  case OO_Spaceship: return BO_Cmp;
1913  case OO_Less: return BO_LT;
1914  case OO_Greater: return BO_GT;
1915  case OO_PlusEqual: return BO_AddAssign;
1916  case OO_MinusEqual: return BO_SubAssign;
1917  case OO_StarEqual: return BO_MulAssign;
1918  case OO_SlashEqual: return BO_DivAssign;
1919  case OO_PercentEqual: return BO_RemAssign;
1920  case OO_CaretEqual: return BO_XorAssign;
1921  case OO_AmpEqual: return BO_AndAssign;
1922  case OO_PipeEqual: return BO_OrAssign;
1923  case OO_LessLess: return BO_Shl;
1924  case OO_GreaterGreater: return BO_Shr;
1925  case OO_LessLessEqual: return BO_ShlAssign;
1926  case OO_GreaterGreaterEqual: return BO_ShrAssign;
1927  case OO_EqualEqual: return BO_EQ;
1928  case OO_ExclaimEqual: return BO_NE;
1929  case OO_LessEqual: return BO_LE;
1930  case OO_GreaterEqual: return BO_GE;
1931  case OO_AmpAmp: return BO_LAnd;
1932  case OO_PipePipe: return BO_LOr;
1933  case OO_Comma: return BO_Comma;
1934  case OO_ArrowStar: return BO_PtrMemI;
1935  }
1936 }
1937 
1939  static const OverloadedOperatorKind OverOps[] = {
1940  /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
1941  OO_Star, OO_Slash, OO_Percent,
1942  OO_Plus, OO_Minus,
1943  OO_LessLess, OO_GreaterGreater,
1944  OO_Spaceship,
1945  OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
1946  OO_EqualEqual, OO_ExclaimEqual,
1947  OO_Amp,
1948  OO_Caret,
1949  OO_Pipe,
1950  OO_AmpAmp,
1951  OO_PipePipe,
1952  OO_Equal, OO_StarEqual,
1953  OO_SlashEqual, OO_PercentEqual,
1954  OO_PlusEqual, OO_MinusEqual,
1955  OO_LessLessEqual, OO_GreaterGreaterEqual,
1956  OO_AmpEqual, OO_CaretEqual,
1957  OO_PipeEqual,
1958  OO_Comma
1959  };
1960  return OverOps[Opc];
1961 }
1962 
1964  Opcode Opc,
1965  Expr *LHS, Expr *RHS) {
1966  if (Opc != BO_Add)
1967  return false;
1968 
1969  // Check that we have one pointer and one integer operand.
1970  Expr *PExp;
1971  if (LHS->getType()->isPointerType()) {
1972  if (!RHS->getType()->isIntegerType())
1973  return false;
1974  PExp = LHS;
1975  } else if (RHS->getType()->isPointerType()) {
1976  if (!LHS->getType()->isIntegerType())
1977  return false;
1978  PExp = RHS;
1979  } else {
1980  return false;
1981  }
1982 
1983  // Check that the pointer is a nullptr.
1984  if (!PExp->IgnoreParenCasts()
1986  return false;
1987 
1988  // Check that the pointee type is char-sized.
1989  const PointerType *PTy = PExp->getType()->getAs<PointerType>();
1990  if (!PTy || !PTy->getPointeeType()->isCharType())
1991  return false;
1992 
1993  return true;
1994 }
1996  ArrayRef<Expr*> initExprs, SourceLocation rbraceloc)
1997  : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
1998  false, false),
1999  InitExprs(C, initExprs.size()),
2000  LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), AltForm(nullptr, true)
2001 {
2002  sawArrayRangeDesignator(false);
2003  for (unsigned I = 0; I != initExprs.size(); ++I) {
2004  if (initExprs[I]->isTypeDependent())
2005  ExprBits.TypeDependent = true;
2006  if (initExprs[I]->isValueDependent())
2007  ExprBits.ValueDependent = true;
2008  if (initExprs[I]->isInstantiationDependent())
2009  ExprBits.InstantiationDependent = true;
2010  if (initExprs[I]->containsUnexpandedParameterPack())
2011  ExprBits.ContainsUnexpandedParameterPack = true;
2012  }
2013 
2014  InitExprs.insert(C, InitExprs.end(), initExprs.begin(), initExprs.end());
2015 }
2016 
2017 void InitListExpr::reserveInits(const ASTContext &C, unsigned NumInits) {
2018  if (NumInits > InitExprs.size())
2019  InitExprs.reserve(C, NumInits);
2020 }
2021 
2022 void InitListExpr::resizeInits(const ASTContext &C, unsigned NumInits) {
2023  InitExprs.resize(C, NumInits, nullptr);
2024 }
2025 
2026 Expr *InitListExpr::updateInit(const ASTContext &C, unsigned Init, Expr *expr) {
2027  if (Init >= InitExprs.size()) {
2028  InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, nullptr);
2029  setInit(Init, expr);
2030  return nullptr;
2031  }
2032 
2033  Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
2034  setInit(Init, expr);
2035  return Result;
2036 }
2037 
2039  assert(!hasArrayFiller() && "Filler already set!");
2040  ArrayFillerOrUnionFieldInit = filler;
2041  // Fill out any "holes" in the array due to designated initializers.
2042  Expr **inits = getInits();
2043  for (unsigned i = 0, e = getNumInits(); i != e; ++i)
2044  if (inits[i] == nullptr)
2045  inits[i] = filler;
2046 }
2047 
2049  if (getNumInits() != 1)
2050  return false;
2051  const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
2052  if (!AT || !AT->getElementType()->isIntegerType())
2053  return false;
2054  // It is possible for getInit() to return null.
2055  const Expr *Init = getInit(0);
2056  if (!Init)
2057  return false;
2058  Init = Init->IgnoreParens();
2059  return isa<StringLiteral>(Init) || isa<ObjCEncodeExpr>(Init);
2060 }
2061 
2063  assert(isSemanticForm() && "syntactic form never semantically transparent");
2064 
2065  // A glvalue InitListExpr is always just sugar.
2066  if (isGLValue()) {
2067  assert(getNumInits() == 1 && "multiple inits in glvalue init list");
2068  return true;
2069  }
2070 
2071  // Otherwise, we're sugar if and only if we have exactly one initializer that
2072  // is of the same type.
2073  if (getNumInits() != 1 || !getInit(0))
2074  return false;
2075 
2076  // Don't confuse aggregate initialization of a struct X { X &x; }; with a
2077  // transparent struct copy.
2078  if (!getInit(0)->isRValue() && getType()->isRecordType())
2079  return false;
2080 
2081  return getType().getCanonicalType() ==
2083 }
2084 
2086  assert(isSyntacticForm() && "only test syntactic form as zero initializer");
2087 
2088  if (LangOpts.CPlusPlus || getNumInits() != 1) {
2089  return false;
2090  }
2091 
2092  const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(getInit(0));
2093  return Lit && Lit->getValue() == 0;
2094 }
2095 
2097  if (InitListExpr *SyntacticForm = getSyntacticForm())
2098  return SyntacticForm->getBeginLoc();
2099  SourceLocation Beg = LBraceLoc;
2100  if (Beg.isInvalid()) {
2101  // Find the first non-null initializer.
2102  for (InitExprsTy::const_iterator I = InitExprs.begin(),
2103  E = InitExprs.end();
2104  I != E; ++I) {
2105  if (Stmt *S = *I) {
2106  Beg = S->getBeginLoc();
2107  break;
2108  }
2109  }
2110  }
2111  return Beg;
2112 }
2113 
2115  if (InitListExpr *SyntacticForm = getSyntacticForm())
2116  return SyntacticForm->getEndLoc();
2117  SourceLocation End = RBraceLoc;
2118  if (End.isInvalid()) {
2119  // Find the first non-null initializer from the end.
2120  for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(),
2121  E = InitExprs.rend();
2122  I != E; ++I) {
2123  if (Stmt *S = *I) {
2124  End = S->getEndLoc();
2125  break;
2126  }
2127  }
2128  }
2129  return End;
2130 }
2131 
2132 /// getFunctionType - Return the underlying function type for this block.
2133 ///
2135  // The block pointer is never sugared, but the function type might be.
2136  return cast<BlockPointerType>(getType())
2137  ->getPointeeType()->castAs<FunctionProtoType>();
2138 }
2139 
2141  return TheBlock->getCaretLocation();
2142 }
2143 const Stmt *BlockExpr::getBody() const {
2144  return TheBlock->getBody();
2145 }
2147  return TheBlock->getBody();
2148 }
2149 
2150 
2151 //===----------------------------------------------------------------------===//
2152 // Generic Expression Routines
2153 //===----------------------------------------------------------------------===//
2154 
2155 /// isUnusedResultAWarning - Return true if this immediate expression should
2156 /// be warned about if the result is unused. If so, fill in Loc and Ranges
2157 /// with location to warn on and the source range[s] to report with the
2158 /// warning.
2160  SourceRange &R1, SourceRange &R2,
2161  ASTContext &Ctx) const {
2162  // Don't warn if the expr is type dependent. The type could end up
2163  // instantiating to void.
2164  if (isTypeDependent())
2165  return false;
2166 
2167  switch (getStmtClass()) {
2168  default:
2169  if (getType()->isVoidType())
2170  return false;
2171  WarnE = this;
2172  Loc = getExprLoc();
2173  R1 = getSourceRange();
2174  return true;
2175  case ParenExprClass:
2176  return cast<ParenExpr>(this)->getSubExpr()->
2177  isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2178  case GenericSelectionExprClass:
2179  return cast<GenericSelectionExpr>(this)->getResultExpr()->
2180  isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2181  case CoawaitExprClass:
2182  case CoyieldExprClass:
2183  return cast<CoroutineSuspendExpr>(this)->getResumeExpr()->
2184  isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2185  case ChooseExprClass:
2186  return cast<ChooseExpr>(this)->getChosenSubExpr()->
2187  isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2188  case UnaryOperatorClass: {
2189  const UnaryOperator *UO = cast<UnaryOperator>(this);
2190 
2191  switch (UO->getOpcode()) {
2192  case UO_Plus:
2193  case UO_Minus:
2194  case UO_AddrOf:
2195  case UO_Not:
2196  case UO_LNot:
2197  case UO_Deref:
2198  break;
2199  case UO_Coawait:
2200  // This is just the 'operator co_await' call inside the guts of a
2201  // dependent co_await call.
2202  case UO_PostInc:
2203  case UO_PostDec:
2204  case UO_PreInc:
2205  case UO_PreDec: // ++/--
2206  return false; // Not a warning.
2207  case UO_Real:
2208  case UO_Imag:
2209  // accessing a piece of a volatile complex is a side-effect.
2210  if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
2211  .isVolatileQualified())
2212  return false;
2213  break;
2214  case UO_Extension:
2215  return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2216  }
2217  WarnE = this;
2218  Loc = UO->getOperatorLoc();
2219  R1 = UO->getSubExpr()->getSourceRange();
2220  return true;
2221  }
2222  case BinaryOperatorClass: {
2223  const BinaryOperator *BO = cast<BinaryOperator>(this);
2224  switch (BO->getOpcode()) {
2225  default:
2226  break;
2227  // Consider the RHS of comma for side effects. LHS was checked by
2228  // Sema::CheckCommaOperands.
2229  case BO_Comma:
2230  // ((foo = <blah>), 0) is an idiom for hiding the result (and
2231  // lvalue-ness) of an assignment written in a macro.
2232  if (IntegerLiteral *IE =
2233  dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
2234  if (IE->getValue() == 0)
2235  return false;
2236  return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2237  // Consider '||', '&&' to have side effects if the LHS or RHS does.
2238  case BO_LAnd:
2239  case BO_LOr:
2240  if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) ||
2241  !BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2242  return false;
2243  break;
2244  }
2245  if (BO->isAssignmentOp())
2246  return false;
2247  WarnE = this;
2248  Loc = BO->getOperatorLoc();
2249  R1 = BO->getLHS()->getSourceRange();
2250  R2 = BO->getRHS()->getSourceRange();
2251  return true;
2252  }
2253  case CompoundAssignOperatorClass:
2254  case VAArgExprClass:
2255  case AtomicExprClass:
2256  return false;
2257 
2258  case ConditionalOperatorClass: {
2259  // If only one of the LHS or RHS is a warning, the operator might
2260  // be being used for control flow. Only warn if both the LHS and
2261  // RHS are warnings.
2262  const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
2263  if (!Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2264  return false;
2265  if (!Exp->getLHS())
2266  return true;
2267  return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2268  }
2269 
2270  case MemberExprClass:
2271  WarnE = this;
2272  Loc = cast<MemberExpr>(this)->getMemberLoc();
2273  R1 = SourceRange(Loc, Loc);
2274  R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
2275  return true;
2276 
2277  case ArraySubscriptExprClass:
2278  WarnE = this;
2279  Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
2280  R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
2281  R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
2282  return true;
2283 
2284  case CXXOperatorCallExprClass: {
2285  // Warn about operator ==,!=,<,>,<=, and >= even when user-defined operator
2286  // overloads as there is no reasonable way to define these such that they
2287  // have non-trivial, desirable side-effects. See the -Wunused-comparison
2288  // warning: operators == and != are commonly typo'ed, and so warning on them
2289  // provides additional value as well. If this list is updated,
2290  // DiagnoseUnusedComparison should be as well.
2291  const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this);
2292  switch (Op->getOperator()) {
2293  default:
2294  break;
2295  case OO_EqualEqual:
2296  case OO_ExclaimEqual:
2297  case OO_Less:
2298  case OO_Greater:
2299  case OO_GreaterEqual:
2300  case OO_LessEqual:
2301  if (Op->getCallReturnType(Ctx)->isReferenceType() ||
2302  Op->getCallReturnType(Ctx)->isVoidType())
2303  break;
2304  WarnE = this;
2305  Loc = Op->getOperatorLoc();
2306  R1 = Op->getSourceRange();
2307  return true;
2308  }
2309 
2310  // Fallthrough for generic call handling.
2311  LLVM_FALLTHROUGH;
2312  }
2313  case CallExprClass:
2314  case CXXMemberCallExprClass:
2315  case UserDefinedLiteralClass: {
2316  // If this is a direct call, get the callee.
2317  const CallExpr *CE = cast<CallExpr>(this);
2318  if (const Decl *FD = CE->getCalleeDecl()) {
2319  // If the callee has attribute pure, const, or warn_unused_result, warn
2320  // about it. void foo() { strlen("bar"); } should warn.
2321  //
2322  // Note: If new cases are added here, DiagnoseUnusedExprResult should be
2323  // updated to match for QoI.
2324  if (CE->hasUnusedResultAttr(Ctx) ||
2325  FD->hasAttr<PureAttr>() || FD->hasAttr<ConstAttr>()) {
2326  WarnE = this;
2327  Loc = CE->getCallee()->getBeginLoc();
2328  R1 = CE->getCallee()->getSourceRange();
2329 
2330  if (unsigned NumArgs = CE->getNumArgs())
2331  R2 = SourceRange(CE->getArg(0)->getBeginLoc(),
2332  CE->getArg(NumArgs - 1)->getEndLoc());
2333  return true;
2334  }
2335  }
2336  return false;
2337  }
2338 
2339  // If we don't know precisely what we're looking at, let's not warn.
2340  case UnresolvedLookupExprClass:
2341  case CXXUnresolvedConstructExprClass:
2342  return false;
2343 
2344  case CXXTemporaryObjectExprClass:
2345  case CXXConstructExprClass: {
2346  if (const CXXRecordDecl *Type = getType()->getAsCXXRecordDecl()) {
2347  if (Type->hasAttr<WarnUnusedAttr>()) {
2348  WarnE = this;
2349  Loc = getBeginLoc();
2350  R1 = getSourceRange();
2351  return true;
2352  }
2353  }
2354  return false;
2355  }
2356 
2357  case ObjCMessageExprClass: {
2358  const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
2359  if (Ctx.getLangOpts().ObjCAutoRefCount &&
2360  ME->isInstanceMessage() &&
2361  !ME->getType()->isVoidType() &&
2362  ME->getMethodFamily() == OMF_init) {
2363  WarnE = this;
2364  Loc = getExprLoc();
2365  R1 = ME->getSourceRange();
2366  return true;
2367  }
2368 
2369  if (const ObjCMethodDecl *MD = ME->getMethodDecl())
2370  if (MD->hasAttr<WarnUnusedResultAttr>()) {
2371  WarnE = this;
2372  Loc = getExprLoc();
2373  return true;
2374  }
2375 
2376  return false;
2377  }
2378 
2379  case ObjCPropertyRefExprClass:
2380  WarnE = this;
2381  Loc = getExprLoc();
2382  R1 = getSourceRange();
2383  return true;
2384 
2385  case PseudoObjectExprClass: {
2386  const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
2387 
2388  // Only complain about things that have the form of a getter.
2389  if (isa<UnaryOperator>(PO->getSyntacticForm()) ||
2390  isa<BinaryOperator>(PO->getSyntacticForm()))
2391  return false;
2392 
2393  WarnE = this;
2394  Loc = getExprLoc();
2395  R1 = getSourceRange();
2396  return true;
2397  }
2398 
2399  case StmtExprClass: {
2400  // Statement exprs don't logically have side effects themselves, but are
2401  // sometimes used in macros in ways that give them a type that is unused.
2402  // For example ({ blah; foo(); }) will end up with a type if foo has a type.
2403  // however, if the result of the stmt expr is dead, we don't want to emit a
2404  // warning.
2405  const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
2406  if (!CS->body_empty()) {
2407  if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
2408  return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2409  if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back()))
2410  if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt()))
2411  return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2412  }
2413 
2414  if (getType()->isVoidType())
2415  return false;
2416  WarnE = this;
2417  Loc = cast<StmtExpr>(this)->getLParenLoc();
2418  R1 = getSourceRange();
2419  return true;
2420  }
2421  case CXXFunctionalCastExprClass:
2422  case CStyleCastExprClass: {
2423  // Ignore an explicit cast to void unless the operand is a non-trivial
2424  // volatile lvalue.
2425  const CastExpr *CE = cast<CastExpr>(this);
2426  if (CE->getCastKind() == CK_ToVoid) {
2427  if (CE->getSubExpr()->isGLValue() &&
2428  CE->getSubExpr()->getType().isVolatileQualified()) {
2429  const DeclRefExpr *DRE =
2430  dyn_cast<DeclRefExpr>(CE->getSubExpr()->IgnoreParens());
2431  if (!(DRE && isa<VarDecl>(DRE->getDecl()) &&
2432  cast<VarDecl>(DRE->getDecl())->hasLocalStorage()) &&
2433  !isa<CallExpr>(CE->getSubExpr()->IgnoreParens())) {
2434  return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc,
2435  R1, R2, Ctx);
2436  }
2437  }
2438  return false;
2439  }
2440 
2441  // If this is a cast to a constructor conversion, check the operand.
2442  // Otherwise, the result of the cast is unused.
2443  if (CE->getCastKind() == CK_ConstructorConversion)
2444  return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2445 
2446  WarnE = this;
2447  if (const CXXFunctionalCastExpr *CXXCE =
2448  dyn_cast<CXXFunctionalCastExpr>(this)) {
2449  Loc = CXXCE->getBeginLoc();
2450  R1 = CXXCE->getSubExpr()->getSourceRange();
2451  } else {
2452  const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(this);
2453  Loc = CStyleCE->getLParenLoc();
2454  R1 = CStyleCE->getSubExpr()->getSourceRange();
2455  }
2456  return true;
2457  }
2458  case ImplicitCastExprClass: {
2459  const CastExpr *ICE = cast<ImplicitCastExpr>(this);
2460 
2461  // lvalue-to-rvalue conversion on a volatile lvalue is a side-effect.
2462  if (ICE->getCastKind() == CK_LValueToRValue &&
2464  return false;
2465 
2466  return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2467  }
2468  case CXXDefaultArgExprClass:
2469  return (cast<CXXDefaultArgExpr>(this)
2470  ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2471  case CXXDefaultInitExprClass:
2472  return (cast<CXXDefaultInitExpr>(this)
2473  ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2474 
2475  case CXXNewExprClass:
2476  // FIXME: In theory, there might be new expressions that don't have side
2477  // effects (e.g. a placement new with an uninitialized POD).
2478  case CXXDeleteExprClass:
2479  return false;
2480  case MaterializeTemporaryExprClass:
2481  return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr()
2482  ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2483  case CXXBindTemporaryExprClass:
2484  return cast<CXXBindTemporaryExpr>(this)->getSubExpr()
2485  ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2486  case ExprWithCleanupsClass:
2487  return cast<ExprWithCleanups>(this)->getSubExpr()
2488  ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2489  }
2490 }
2491 
2492 /// isOBJCGCCandidate - Check if an expression is objc gc'able.
2493 /// returns true, if it is; false otherwise.
2495  const Expr *E = IgnoreParens();
2496  switch (E->getStmtClass()) {
2497  default:
2498  return false;
2499  case ObjCIvarRefExprClass:
2500  return true;
2501  case Expr::UnaryOperatorClass:
2502  return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
2503  case ImplicitCastExprClass:
2504  return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
2505  case MaterializeTemporaryExprClass:
2506  return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr()
2507  ->isOBJCGCCandidate(Ctx);
2508  case CStyleCastExprClass:
2509  return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
2510  case DeclRefExprClass: {
2511  const Decl *D = cast<DeclRefExpr>(E)->getDecl();
2512 
2513  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
2514  if (VD->hasGlobalStorage())
2515  return true;
2516  QualType T = VD->getType();
2517  // dereferencing to a pointer is always a gc'able candidate,
2518  // unless it is __weak.
2519  return T->isPointerType() &&
2520  (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
2521  }
2522  return false;
2523  }
2524  case MemberExprClass: {
2525  const MemberExpr *M = cast<MemberExpr>(E);
2526  return M->getBase()->isOBJCGCCandidate(Ctx);
2527  }
2528  case ArraySubscriptExprClass:
2529  return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx);
2530  }
2531 }
2532 
2534  if (isTypeDependent())
2535  return false;
2536  return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
2537 }
2538 
2540  assert(expr->hasPlaceholderType(BuiltinType::BoundMember));
2541 
2542  // Bound member expressions are always one of these possibilities:
2543  // x->m x.m x->*y x.*y
2544  // (possibly parenthesized)
2545 
2546  expr = expr->IgnoreParens();
2547  if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) {
2548  assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
2549  return mem->getMemberDecl()->getType();
2550  }
2551 
2552  if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) {
2553  QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
2554  ->getPointeeType();
2555  assert(type->isFunctionType());
2556  return type;
2557  }
2558 
2559  assert(isa<UnresolvedMemberExpr>(expr) || isa<CXXPseudoDestructorExpr>(expr));
2560  return QualType();
2561 }
2562 
2564  if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
2565  return ICE->getSubExpr();
2566 
2567  if (auto *FE = dyn_cast<FullExpr>(E))
2568  return FE->getSubExpr();
2569 
2570  return E;
2571 }
2572 
2574  // FIXME: Skip MaterializeTemporaryExpr and SubstNonTypeTemplateParmExpr in
2575  // addition to what IgnoreImpCasts() skips to account for the current
2576  // behaviour of IgnoreParenImpCasts().
2577  Expr *SubE = IgnoreImpCastsSingleStep(E);
2578  if (SubE != E)
2579  return SubE;
2580 
2581  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E))
2582  return MTE->GetTemporaryExpr();
2583 
2584  if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E))
2585  return NTTP->getReplacement();
2586 
2587  return E;
2588 }
2589 
2591  if (auto *CE = dyn_cast<CastExpr>(E))
2592  return CE->getSubExpr();
2593 
2594  if (auto *FE = dyn_cast<FullExpr>(E))
2595  return FE->getSubExpr();
2596 
2597  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E))
2598  return MTE->GetTemporaryExpr();
2599 
2600  if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E))
2601  return NTTP->getReplacement();
2602 
2603  return E;
2604 }
2605 
2607  // Skip what IgnoreCastsSingleStep skips, except that only
2608  // lvalue-to-rvalue casts are skipped.
2609  if (auto *CE = dyn_cast<CastExpr>(E))
2610  if (CE->getCastKind() != CK_LValueToRValue)
2611  return E;
2612 
2613  return IgnoreCastsSingleStep(E);
2614 }
2615 
2617  if (auto *CE = dyn_cast<CastExpr>(E))
2618  if (CE->getCastKind() == CK_DerivedToBase ||
2619  CE->getCastKind() == CK_UncheckedDerivedToBase ||
2620  CE->getCastKind() == CK_NoOp)
2621  return CE->getSubExpr();
2622 
2623  return E;
2624 }
2625 
2627  Expr *SubE = IgnoreImpCastsSingleStep(E);
2628  if (SubE != E)
2629  return SubE;
2630 
2631  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E))
2632  return MTE->GetTemporaryExpr();
2633 
2634  if (auto *BTE = dyn_cast<CXXBindTemporaryExpr>(E))
2635  return BTE->getSubExpr();
2636 
2637  return E;
2638 }
2639 
2641  if (auto *PE = dyn_cast<ParenExpr>(E))
2642  return PE->getSubExpr();
2643 
2644  if (auto *UO = dyn_cast<UnaryOperator>(E)) {
2645  if (UO->getOpcode() == UO_Extension)
2646  return UO->getSubExpr();
2647  }
2648 
2649  else if (auto *GSE = dyn_cast<GenericSelectionExpr>(E)) {
2650  if (!GSE->isResultDependent())
2651  return GSE->getResultExpr();
2652  }
2653 
2654  else if (auto *CE = dyn_cast<ChooseExpr>(E)) {
2655  if (!CE->isConditionDependent())
2656  return CE->getChosenSubExpr();
2657  }
2658 
2659  else if (auto *CE = dyn_cast<ConstantExpr>(E))
2660  return CE->getSubExpr();
2661 
2662  return E;
2663 }
2664 
2666  if (auto *CE = dyn_cast<CastExpr>(E)) {
2667  // We ignore integer <-> casts that are of the same width, ptr<->ptr and
2668  // ptr<->int casts of the same width. We also ignore all identity casts.
2669  Expr *SubExpr = CE->getSubExpr();
2670  bool IsIdentityCast =
2671  Ctx.hasSameUnqualifiedType(E->getType(), SubExpr->getType());
2672  bool IsSameWidthCast =
2673  (E->getType()->isPointerType() || E->getType()->isIntegralType(Ctx)) &&
2674  (SubExpr->getType()->isPointerType() ||
2675  SubExpr->getType()->isIntegralType(Ctx)) &&
2676  (Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SubExpr->getType()));
2677 
2678  if (IsIdentityCast || IsSameWidthCast)
2679  return SubExpr;
2680  }
2681 
2682  else if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E))
2683  return NTTP->getReplacement();
2684 
2685  return E;
2686 }
2687 
2688 static Expr *IgnoreExprNodesImpl(Expr *E) { return E; }
2689 template <typename FnTy, typename... FnTys>
2690 static Expr *IgnoreExprNodesImpl(Expr *E, FnTy &&Fn, FnTys &&... Fns) {
2691  return IgnoreExprNodesImpl(Fn(E), std::forward<FnTys>(Fns)...);
2692 }
2693 
2694 /// Given an expression E and functions Fn_1,...,Fn_n : Expr * -> Expr *,
2695 /// Recursively apply each of the functions to E until reaching a fixed point.
2696 /// Note that a null E is valid; in this case nothing is done.
2697 template <typename... FnTys>
2698 static Expr *IgnoreExprNodes(Expr *E, FnTys &&... Fns) {
2699  Expr *LastE = nullptr;
2700  while (E != LastE) {
2701  LastE = E;
2702  E = IgnoreExprNodesImpl(E, std::forward<FnTys>(Fns)...);
2703  }
2704  return E;
2705 }
2706 
2709 }
2710 
2712  return IgnoreExprNodes(this, IgnoreCastsSingleStep);
2713 }
2714 
2717 }
2718 
2721 }
2722 
2726 }
2727 
2730 }
2731 
2733  if (auto *MCE = dyn_cast<CXXMemberCallExpr>(this)) {
2734  if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl()))
2735  return MCE->getImplicitObjectArgument();
2736  }
2737  return this;
2738 }
2739 
2743 }
2744 
2748 }
2749 
2751  return IgnoreExprNodes(this, IgnoreParensSingleStep, [&Ctx](Expr *E) {
2752  return IgnoreNoopCastsSingleStep(Ctx, E);
2753  });
2754 }
2755 
2757  const Expr *E = this;
2758  if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E))
2759  E = M->GetTemporaryExpr();
2760 
2761  while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
2762  E = ICE->getSubExprAsWritten();
2763 
2764  return isa<CXXDefaultArgExpr>(E);
2765 }
2766 
2767 /// Skip over any no-op casts and any temporary-binding
2768 /// expressions.
2770  if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E))
2771  E = M->GetTemporaryExpr();
2772 
2773  while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2774  if (ICE->getCastKind() == CK_NoOp)
2775  E = ICE->getSubExpr();
2776  else
2777  break;
2778  }
2779 
2780  while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
2781  E = BE->getSubExpr();
2782 
2783  while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2784  if (ICE->getCastKind() == CK_NoOp)
2785  E = ICE->getSubExpr();
2786  else
2787  break;
2788  }
2789 
2790  return E->IgnoreParens();
2791 }
2792 
2793 /// isTemporaryObject - Determines if this expression produces a
2794 /// temporary of the given class type.
2795 bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
2796  if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy)))
2797  return false;
2798 
2800 
2801  // Temporaries are by definition pr-values of class type.
2802  if (!E->Classify(C).isPRValue()) {
2803  // In this context, property reference is a message call and is pr-value.
2804  if (!isa<ObjCPropertyRefExpr>(E))
2805  return false;
2806  }
2807 
2808  // Black-list a few cases which yield pr-values of class type that don't
2809  // refer to temporaries of that type:
2810 
2811  // - implicit derived-to-base conversions
2812  if (isa<ImplicitCastExpr>(E)) {
2813  switch (cast<ImplicitCastExpr>(E)->getCastKind()) {
2814  case CK_DerivedToBase:
2815  case CK_UncheckedDerivedToBase:
2816  return false;
2817  default:
2818  break;
2819  }
2820  }
2821 
2822  // - member expressions (all)
2823  if (isa<MemberExpr>(E))
2824  return false;
2825 
2826  if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E))
2827  if (BO->isPtrMemOp())
2828  return false;
2829 
2830  // - opaque values (all)
2831  if (isa<OpaqueValueExpr>(E))
2832  return false;
2833 
2834  return true;
2835 }
2836 
2838  const Expr *E = this;
2839 
2840  // Strip away parentheses and casts we don't care about.
2841  while (true) {
2842  if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) {
2843  E = Paren->getSubExpr();
2844  continue;
2845  }
2846 
2847  if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2848  if (ICE->getCastKind() == CK_NoOp ||
2849  ICE->getCastKind() == CK_LValueToRValue ||
2850  ICE->getCastKind() == CK_DerivedToBase ||
2851  ICE->getCastKind() == CK_UncheckedDerivedToBase) {
2852  E = ICE->getSubExpr();
2853  continue;
2854  }
2855  }
2856 
2857  if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) {
2858  if (UnOp->getOpcode() == UO_Extension) {
2859  E = UnOp->getSubExpr();
2860  continue;
2861  }
2862  }
2863 
2864  if (const MaterializeTemporaryExpr *M
2865  = dyn_cast<MaterializeTemporaryExpr>(E)) {
2866  E = M->GetTemporaryExpr();
2867  continue;
2868  }
2869 
2870  break;
2871  }
2872 
2873  if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E))
2874  return This->isImplicit();
2875 
2876  return false;
2877 }
2878 
2879 /// hasAnyTypeDependentArguments - Determines if any of the expressions
2880 /// in Exprs is type-dependent.
2882  for (unsigned I = 0; I < Exprs.size(); ++I)
2883  if (Exprs[I]->isTypeDependent())
2884  return true;
2885 
2886  return false;
2887 }
2888 
2889 bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef,
2890  const Expr **Culprit) const {
2891  // This function is attempting whether an expression is an initializer
2892  // which can be evaluated at compile-time. It very closely parallels
2893  // ConstExprEmitter in CGExprConstant.cpp; if they don't match, it
2894  // will lead to unexpected results. Like ConstExprEmitter, it falls back
2895  // to isEvaluatable most of the time.
2896  //
2897  // If we ever capture reference-binding directly in the AST, we can
2898  // kill the second parameter.
2899 
2900  if (IsForRef) {
2902  if (EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects)
2903  return true;
2904  if (Culprit)
2905  *Culprit = this;
2906  return false;
2907  }
2908 
2909  switch (getStmtClass()) {
2910  default: break;
2911  case StringLiteralClass:
2912  case ObjCEncodeExprClass:
2913  return true;
2914  case CXXTemporaryObjectExprClass:
2915  case CXXConstructExprClass: {
2916  const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
2917 
2918  if (CE->getConstructor()->isTrivial() &&
2920  // Trivial default constructor
2921  if (!CE->getNumArgs()) return true;
2922 
2923  // Trivial copy constructor
2924  assert(CE->getNumArgs() == 1 && "trivial ctor with > 1 argument");
2925  return CE->getArg(0)->isConstantInitializer(Ctx, false, Culprit);
2926  }
2927 
2928  break;
2929  }
2930  case ConstantExprClass: {
2931  // FIXME: We should be able to return "true" here, but it can lead to extra
2932  // error messages. E.g. in Sema/array-init.c.
2933  const Expr *Exp = cast<ConstantExpr>(this)->getSubExpr();
2934  return Exp->isConstantInitializer(Ctx, false, Culprit);
2935  }
2936  case CompoundLiteralExprClass: {
2937  // This handles gcc's extension that allows global initializers like
2938  // "struct x {int x;} x = (struct x) {};".
2939  // FIXME: This accepts other cases it shouldn't!
2940  const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
2941  return Exp->isConstantInitializer(Ctx, false, Culprit);
2942  }
2943  case DesignatedInitUpdateExprClass: {
2944  const DesignatedInitUpdateExpr *DIUE = cast<DesignatedInitUpdateExpr>(this);
2945  return DIUE->getBase()->isConstantInitializer(Ctx, false, Culprit) &&
2946  DIUE->getUpdater()->isConstantInitializer(Ctx, false, Culprit);
2947  }
2948  case InitListExprClass: {
2949  const InitListExpr *ILE = cast<InitListExpr>(this);
2950  if (ILE->getType()->isArrayType()) {
2951  unsigned numInits = ILE->getNumInits();
2952  for (unsigned i = 0; i < numInits; i++) {
2953  if (!ILE->getInit(i)->isConstantInitializer(Ctx, false, Culprit))
2954  return false;
2955  }
2956  return true;
2957  }
2958 
2959  if (ILE->getType()->isRecordType()) {
2960  unsigned ElementNo = 0;
2961  RecordDecl *RD = ILE->getType()->getAs<RecordType>()->getDecl();
2962  for (const auto *Field : RD->fields()) {
2963  // If this is a union, skip all the fields that aren't being initialized.
2964  if (RD->isUnion() && ILE->getInitializedFieldInUnion() != Field)
2965  continue;
2966 
2967  // Don't emit anonymous bitfields, they just affect layout.
2968  if (Field->isUnnamedBitfield())
2969  continue;
2970 
2971  if (ElementNo < ILE->getNumInits()) {
2972  const Expr *Elt = ILE->getInit(ElementNo++);
2973  if (Field->isBitField()) {
2974  // Bitfields have to evaluate to an integer.
2976  if (!Elt->EvaluateAsInt(Result, Ctx)) {
2977  if (Culprit)
2978  *Culprit = Elt;
2979  return false;
2980  }
2981  } else {
2982  bool RefType = Field->getType()->isReferenceType();
2983  if (!Elt->isConstantInitializer(Ctx, RefType, Culprit))
2984  return false;
2985  }
2986  }
2987  }
2988  return true;
2989  }
2990 
2991  break;
2992  }
2993  case ImplicitValueInitExprClass:
2994  case NoInitExprClass:
2995  return true;
2996  case ParenExprClass:
2997  return cast<ParenExpr>(this)->getSubExpr()
2998  ->isConstantInitializer(Ctx, IsForRef, Culprit);
2999  case GenericSelectionExprClass:
3000  return cast<GenericSelectionExpr>(this)->getResultExpr()
3001  ->isConstantInitializer(Ctx, IsForRef, Culprit);
3002  case ChooseExprClass:
3003  if (cast<ChooseExpr>(this)->isConditionDependent()) {
3004  if (Culprit)
3005  *Culprit = this;
3006  return false;
3007  }
3008  return cast<ChooseExpr>(this)->getChosenSubExpr()
3009  ->isConstantInitializer(Ctx, IsForRef, Culprit);
3010  case UnaryOperatorClass: {
3011  const UnaryOperator* Exp = cast<UnaryOperator>(this);
3012  if (Exp->getOpcode() == UO_Extension)
3013  return Exp->getSubExpr()->isConstantInitializer(Ctx, false, Culprit);
3014  break;
3015  }
3016  case CXXFunctionalCastExprClass:
3017  case CXXStaticCastExprClass:
3018  case ImplicitCastExprClass:
3019  case CStyleCastExprClass:
3020  case ObjCBridgedCastExprClass:
3021  case CXXDynamicCastExprClass:
3022  case CXXReinterpretCastExprClass:
3023  case CXXConstCastExprClass: {
3024  const CastExpr *CE = cast<CastExpr>(this);
3025 
3026  // Handle misc casts we want to ignore.
3027  if (CE->getCastKind() == CK_NoOp ||
3028  CE->getCastKind() == CK_LValueToRValue ||
3029  CE->getCastKind() == CK_ToUnion ||
3030  CE->getCastKind() == CK_ConstructorConversion ||
3031  CE->getCastKind() == CK_NonAtomicToAtomic ||
3032  CE->getCastKind() == CK_AtomicToNonAtomic ||
3033  CE->getCastKind() == CK_IntToOCLSampler)
3034  return CE->getSubExpr()->isConstantInitializer(Ctx, false, Culprit);
3035 
3036  break;
3037  }
3038  case MaterializeTemporaryExprClass:
3039  return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr()
3040  ->isConstantInitializer(Ctx, false, Culprit);
3041 
3042  case SubstNonTypeTemplateParmExprClass:
3043  return cast<SubstNonTypeTemplateParmExpr>(this)->getReplacement()
3044  ->isConstantInitializer(Ctx, false, Culprit);
3045  case CXXDefaultArgExprClass:
3046  return cast<CXXDefaultArgExpr>(this)->getExpr()
3047  ->isConstantInitializer(Ctx, false, Culprit);
3048  case CXXDefaultInitExprClass:
3049  return cast<CXXDefaultInitExpr>(this)->getExpr()
3050  ->isConstantInitializer(Ctx, false, Culprit);
3051  }
3052  // Allow certain forms of UB in constant initializers: signed integer
3053  // overflow and floating-point division by zero. We'll give a warning on
3054  // these, but they're common enough that we have to accept them.
3056  return true;
3057  if (Culprit)
3058  *Culprit = this;
3059  return false;
3060 }
3061 
3063  const FunctionDecl* FD = getDirectCallee();
3064  if (!FD || (FD->getBuiltinID() != Builtin::BI__assume &&
3065  FD->getBuiltinID() != Builtin::BI__builtin_assume))
3066  return false;
3067 
3068  const Expr* Arg = getArg(0);
3069  bool ArgVal;
3070  return !Arg->isValueDependent() &&
3071  Arg->EvaluateAsBooleanCondition(ArgVal, Ctx) && !ArgVal;
3072 }
3073 
3074 namespace {
3075  /// Look for any side effects within a Stmt.
3076  class SideEffectFinder : public ConstEvaluatedExprVisitor<SideEffectFinder> {
3078  const bool IncludePossibleEffects;
3079  bool HasSideEffects;
3080 
3081  public:
3082  explicit SideEffectFinder(const ASTContext &Context, bool IncludePossible)
3083  : Inherited(Context),
3084  IncludePossibleEffects(IncludePossible), HasSideEffects(false) { }
3085 
3086  bool hasSideEffects() const { return HasSideEffects; }
3087 
3088  void VisitExpr(const Expr *E) {
3089  if (!HasSideEffects &&
3090  E->HasSideEffects(Context, IncludePossibleEffects))
3091  HasSideEffects = true;
3092  }
3093  };
3094 }
3095 
3097  bool IncludePossibleEffects) const {
3098  // In circumstances where we care about definite side effects instead of
3099  // potential side effects, we want to ignore expressions that are part of a
3100  // macro expansion as a potential side effect.
3101  if (!IncludePossibleEffects && getExprLoc().isMacroID())
3102  return false;
3103 
3105  return IncludePossibleEffects;
3106 
3107  switch (getStmtClass()) {
3108  case NoStmtClass:
3109  #define ABSTRACT_STMT(Type)
3110  #define STMT(Type, Base) case Type##Class:
3111  #define EXPR(Type, Base)
3112  #include "clang/AST/StmtNodes.inc"
3113  llvm_unreachable("unexpected Expr kind");
3114 
3115  case DependentScopeDeclRefExprClass:
3116  case CXXUnresolvedConstructExprClass:
3117  case CXXDependentScopeMemberExprClass:
3118  case UnresolvedLookupExprClass:
3119  case UnresolvedMemberExprClass:
3120  case PackExpansionExprClass:
3121  case SubstNonTypeTemplateParmPackExprClass:
3122  case FunctionParmPackExprClass:
3123  case TypoExprClass:
3124  case CXXFoldExprClass:
3125  llvm_unreachable("shouldn't see dependent / unresolved nodes here");
3126 
3127  case DeclRefExprClass:
3128  case ObjCIvarRefExprClass:
3129  case PredefinedExprClass:
3130  case IntegerLiteralClass:
3131  case FixedPointLiteralClass:
3132  case FloatingLiteralClass:
3133  case ImaginaryLiteralClass:
3134  case StringLiteralClass:
3135  case CharacterLiteralClass:
3136  case OffsetOfExprClass:
3137  case ImplicitValueInitExprClass:
3138  case UnaryExprOrTypeTraitExprClass:
3139  case AddrLabelExprClass:
3140  case GNUNullExprClass:
3141  case ArrayInitIndexExprClass:
3142  case NoInitExprClass:
3143  case CXXBoolLiteralExprClass:
3144  case CXXNullPtrLiteralExprClass:
3145  case CXXThisExprClass:
3146  case CXXScalarValueInitExprClass:
3147  case TypeTraitExprClass:
3148  case ArrayTypeTraitExprClass:
3149  case ExpressionTraitExprClass:
3150  case CXXNoexceptExprClass:
3151  case SizeOfPackExprClass:
3152  case ObjCStringLiteralClass:
3153  case ObjCEncodeExprClass:
3154  case ObjCBoolLiteralExprClass:
3155  case ObjCAvailabilityCheckExprClass:
3156  case CXXUuidofExprClass:
3157  case OpaqueValueExprClass:
3158  // These never have a side-effect.
3159  return false;
3160 
3161  case ConstantExprClass:
3162  // FIXME: Move this into the "return false;" block above.
3163  return cast<ConstantExpr>(this)->getSubExpr()->HasSideEffects(
3164  Ctx, IncludePossibleEffects);
3165 
3166  case CallExprClass:
3167  case CXXOperatorCallExprClass:
3168  case CXXMemberCallExprClass:
3169  case CUDAKernelCallExprClass:
3170  case UserDefinedLiteralClass: {
3171  // We don't know a call definitely has side effects, except for calls
3172  // to pure/const functions that definitely don't.
3173  // If the call itself is considered side-effect free, check the operands.
3174  const Decl *FD = cast<CallExpr>(this)->getCalleeDecl();
3175  bool IsPure = FD && (FD->hasAttr<ConstAttr>() || FD->hasAttr<PureAttr>());
3176  if (IsPure || !IncludePossibleEffects)
3177  break;
3178  return true;
3179  }
3180 
3181  case BlockExprClass:
3182  case CXXBindTemporaryExprClass:
3183  if (!IncludePossibleEffects)
3184  break;
3185  return true;
3186 
3187  case MSPropertyRefExprClass:
3188  case MSPropertySubscriptExprClass:
3189  case CompoundAssignOperatorClass:
3190  case VAArgExprClass:
3191  case AtomicExprClass:
3192  case CXXThrowExprClass:
3193  case CXXNewExprClass:
3194  case CXXDeleteExprClass:
3195  case CoawaitExprClass:
3196  case DependentCoawaitExprClass:
3197  case CoyieldExprClass:
3198  // These always have a side-effect.
3199  return true;
3200 
3201  case StmtExprClass: {
3202  // StmtExprs have a side-effect if any substatement does.
3203  SideEffectFinder Finder(Ctx, IncludePossibleEffects);
3204  Finder.Visit(cast<StmtExpr>(this)->getSubStmt());
3205  return Finder.hasSideEffects();
3206  }
3207 
3208  case ExprWithCleanupsClass:
3209  if (IncludePossibleEffects)
3210  if (cast<ExprWithCleanups>(this)->cleanupsHaveSideEffects())
3211  return true;
3212  break;
3213 
3214  case ParenExprClass:
3215  case ArraySubscriptExprClass:
3216  case OMPArraySectionExprClass:
3217  case MemberExprClass:
3218  case ConditionalOperatorClass:
3219  case BinaryConditionalOperatorClass:
3220  case CompoundLiteralExprClass:
3221  case ExtVectorElementExprClass:
3222  case DesignatedInitExprClass:
3223  case DesignatedInitUpdateExprClass:
3224  case ArrayInitLoopExprClass:
3225  case ParenListExprClass:
3226  case CXXPseudoDestructorExprClass:
3227  case CXXStdInitializerListExprClass:
3228  case SubstNonTypeTemplateParmExprClass:
3229  case MaterializeTemporaryExprClass:
3230  case ShuffleVectorExprClass:
3231  case ConvertVectorExprClass:
3232  case AsTypeExprClass:
3233  // These have a side-effect if any subexpression does.
3234  break;
3235 
3236  case UnaryOperatorClass:
3237  if (cast<UnaryOperator>(this)->isIncrementDecrementOp())
3238  return true;
3239  break;
3240 
3241  case BinaryOperatorClass:
3242  if (cast<BinaryOperator>(this)->isAssignmentOp())
3243  return true;
3244  break;
3245 
3246  case InitListExprClass:
3247  // FIXME: The children for an InitListExpr doesn't include the array filler.
3248  if (const Expr *E = cast<InitListExpr>(this)->getArrayFiller())
3249  if (E->HasSideEffects(Ctx, IncludePossibleEffects))
3250  return true;
3251  break;
3252 
3253  case GenericSelectionExprClass:
3254  return cast<GenericSelectionExpr>(this)->getResultExpr()->
3255  HasSideEffects(Ctx, IncludePossibleEffects);
3256 
3257  case ChooseExprClass:
3258  return cast<ChooseExpr>(this)->getChosenSubExpr()->HasSideEffects(
3259  Ctx, IncludePossibleEffects);
3260 
3261  case CXXDefaultArgExprClass:
3262  return cast<CXXDefaultArgExpr>(this)->getExpr()->HasSideEffects(
3263  Ctx, IncludePossibleEffects);
3264 
3265  case CXXDefaultInitExprClass: {
3266  const FieldDecl *FD = cast<CXXDefaultInitExpr>(this)->getField();
3267  if (const Expr *E = FD->getInClassInitializer())
3268  return E->HasSideEffects(Ctx, IncludePossibleEffects);
3269  // If we've not yet parsed the initializer, assume it has side-effects.
3270  return true;
3271  }
3272 
3273  case CXXDynamicCastExprClass: {
3274  // A dynamic_cast expression has side-effects if it can throw.
3275  const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(this);
3276  if (DCE->getTypeAsWritten()->isReferenceType() &&
3277  DCE->getCastKind() == CK_Dynamic)
3278  return true;
3279  }
3280  LLVM_FALLTHROUGH;
3281  case ImplicitCastExprClass:
3282  case CStyleCastExprClass:
3283  case CXXStaticCastExprClass:
3284  case CXXReinterpretCastExprClass:
3285  case CXXConstCastExprClass:
3286  case CXXFunctionalCastExprClass: {
3287  // While volatile reads are side-effecting in both C and C++, we treat them
3288  // as having possible (not definite) side-effects. This allows idiomatic
3289  // code to behave without warning, such as sizeof(*v) for a volatile-
3290  // qualified pointer.
3291  if (!IncludePossibleEffects)
3292  break;
3293 
3294  const CastExpr *CE = cast<CastExpr>(this);
3295  if (CE->getCastKind() == CK_LValueToRValue &&
3297  return true;
3298  break;
3299  }
3300 
3301  case CXXTypeidExprClass:
3302  // typeid might throw if its subexpression is potentially-evaluated, so has
3303  // side-effects in that case whether or not its subexpression does.
3304  return cast<CXXTypeidExpr>(this)->isPotentiallyEvaluated();
3305 
3306  case CXXConstructExprClass:
3307  case CXXTemporaryObjectExprClass: {
3308  const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
3309  if (!CE->getConstructor()->isTrivial() && IncludePossibleEffects)
3310  return true;
3311  // A trivial constructor does not add any side-effects of its own. Just look
3312  // at its arguments.
3313  break;
3314  }
3315 
3316  case CXXInheritedCtorInitExprClass: {
3317  const auto *ICIE = cast<CXXInheritedCtorInitExpr>(this);
3318  if (!ICIE->getConstructor()->isTrivial() && IncludePossibleEffects)
3319  return true;
3320  break;
3321  }
3322 
3323  case LambdaExprClass: {
3324  const LambdaExpr *LE = cast<LambdaExpr>(this);
3325  for (Expr *E : LE->capture_inits())
3326  if (E->HasSideEffects(Ctx, IncludePossibleEffects))
3327  return true;
3328  return false;
3329  }
3330 
3331  case PseudoObjectExprClass: {
3332  // Only look for side-effects in the semantic form, and look past
3333  // OpaqueValueExpr bindings in that form.
3334  const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
3336  E = PO->semantics_end();
3337  I != E; ++I) {
3338  const Expr *Subexpr = *I;
3339  if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Subexpr))
3340  Subexpr = OVE->getSourceExpr();
3341  if (Subexpr->HasSideEffects(Ctx, IncludePossibleEffects))
3342  return true;
3343  }
3344  return false;
3345  }
3346 
3347  case ObjCBoxedExprClass:
3348  case ObjCArrayLiteralClass:
3349  case ObjCDictionaryLiteralClass:
3350  case ObjCSelectorExprClass:
3351  case ObjCProtocolExprClass:
3352  case ObjCIsaExprClass:
3353  case ObjCIndirectCopyRestoreExprClass:
3354  case ObjCSubscriptRefExprClass:
3355  case ObjCBridgedCastExprClass:
3356  case ObjCMessageExprClass:
3357  case ObjCPropertyRefExprClass:
3358  // FIXME: Classify these cases better.
3359  if (IncludePossibleEffects)
3360  return true;
3361  break;
3362  }
3363 
3364  // Recurse to children.
3365  for (const Stmt *SubStmt : children())
3366  if (SubStmt &&
3367  cast<Expr>(SubStmt)->HasSideEffects(Ctx, IncludePossibleEffects))
3368  return true;
3369 
3370  return false;
3371 }
3372 
3373 namespace {
3374  /// Look for a call to a non-trivial function within an expression.
3375  class NonTrivialCallFinder : public ConstEvaluatedExprVisitor<NonTrivialCallFinder>
3376  {
3378 
3379  bool NonTrivial;
3380 
3381  public:
3382  explicit NonTrivialCallFinder(const ASTContext &Context)
3383  : Inherited(Context), NonTrivial(false) { }
3384 
3385  bool hasNonTrivialCall() const { return NonTrivial; }
3386 
3387  void VisitCallExpr(const CallExpr *E) {
3388  if (const CXXMethodDecl *Method
3389  = dyn_cast_or_null<const CXXMethodDecl>(E->getCalleeDecl())) {
3390  if (Method->isTrivial()) {
3391  // Recurse to children of the call.
3392  Inherited::VisitStmt(E);
3393  return;
3394  }
3395  }
3396 
3397  NonTrivial = true;
3398  }
3399 
3400  void VisitCXXConstructExpr(const CXXConstructExpr *E) {
3401  if (E->getConstructor()->isTrivial()) {
3402  // Recurse to children of the call.
3403  Inherited::VisitStmt(E);
3404  return;
3405  }
3406 
3407  NonTrivial = true;
3408  }
3409 
3410  void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
3411  if (E->getTemporary()->getDestructor()->isTrivial()) {
3412  Inherited::VisitStmt(E);
3413  return;
3414  }
3415 
3416  NonTrivial = true;
3417  }
3418  };
3419 }
3420 
3421 bool Expr::hasNonTrivialCall(const ASTContext &Ctx) const {
3422  NonTrivialCallFinder Finder(Ctx);
3423  Finder.Visit(this);
3424  return Finder.hasNonTrivialCall();
3425 }
3426 
3427 /// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
3428 /// pointer constant or not, as well as the specific kind of constant detected.
3429 /// Null pointer constants can be integer constant expressions with the
3430 /// value zero, casts of zero to void*, nullptr (C++0X), or __null
3431 /// (a GNU extension).
3435  if (isValueDependent() &&
3436  (!Ctx.getLangOpts().CPlusPlus11 || Ctx.getLangOpts().MSVCCompat)) {
3437  switch (NPC) {
3439  llvm_unreachable("Unexpected value dependent expression!");
3441  if (isTypeDependent() || getType()->isIntegralType(Ctx))
3442  return NPCK_ZeroExpression;
3443  else
3444  return NPCK_NotNull;
3445 
3447  return NPCK_NotNull;
3448  }
3449  }
3450 
3451  // Strip off a cast to void*, if it exists. Except in C++.
3452  if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
3453  if (!Ctx.getLangOpts().CPlusPlus) {
3454  // Check that it is a cast to void*.
3455  if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
3456  QualType Pointee = PT->getPointeeType();
3457  Qualifiers Qs = Pointee.getQualifiers();
3458  // Only (void*)0 or equivalent are treated as nullptr. If pointee type
3459  // has non-default address space it is not treated as nullptr.
3460  // (__generic void*)0 in OpenCL 2.0 should not be treated as nullptr
3461  // since it cannot be assigned to a pointer to constant address space.
3462  if ((Ctx.getLangOpts().OpenCLVersion >= 200 &&
3463  Pointee.getAddressSpace() == LangAS::opencl_generic) ||
3464  (Ctx.getLangOpts().OpenCL &&
3465  Ctx.getLangOpts().OpenCLVersion < 200 &&
3467  Qs.removeAddressSpace();
3468 
3469  if (Pointee->isVoidType() && Qs.empty() && // to void*
3470  CE->getSubExpr()->getType()->isIntegerType()) // from int
3471  return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
3472  }
3473  }
3474  } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
3475  // Ignore the ImplicitCastExpr type entirely.
3476  return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
3477  } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
3478  // Accept ((void*)0) as a null pointer constant, as many other
3479  // implementations do.
3480  return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
3481  } else if (const GenericSelectionExpr *GE =
3482  dyn_cast<GenericSelectionExpr>(this)) {
3483  if (GE->isResultDependent())
3484  return NPCK_NotNull;
3485  return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
3486  } else if (const ChooseExpr *CE = dyn_cast<ChooseExpr>(this)) {
3487  if (CE->isConditionDependent())
3488  return NPCK_NotNull;
3489  return CE->getChosenSubExpr()->isNullPointerConstant(Ctx, NPC);
3490  } else if (const CXXDefaultArgExpr *DefaultArg
3491  = dyn_cast<CXXDefaultArgExpr>(this)) {
3492  // See through default argument expressions.
3493  return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
3494  } else if (const CXXDefaultInitExpr *DefaultInit
3495  = dyn_cast<CXXDefaultInitExpr>(this)) {
3496  // See through default initializer expressions.
3497  return DefaultInit->getExpr()->isNullPointerConstant(Ctx, NPC);
3498  } else if (isa<GNUNullExpr>(this)) {
3499  // The GNU __null extension is always a null pointer constant.
3500  return NPCK_GNUNull;
3501  } else if (const MaterializeTemporaryExpr *M
3502  = dyn_cast<MaterializeTemporaryExpr>(this)) {
3503  return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC);
3504  } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) {
3505  if (const Expr *Source = OVE->getSourceExpr())
3506  return Source->isNullPointerConstant(Ctx, NPC);
3507  }
3508 
3509  // C++11 nullptr_t is always a null pointer constant.
3510  if (getType()->isNullPtrType())
3511  return NPCK_CXX11_nullptr;
3512 
3513  if (const RecordType *UT = getType()->getAsUnionType())
3514  if (!Ctx.getLangOpts().CPlusPlus11 &&
3515  UT && UT->getDecl()->hasAttr<TransparentUnionAttr>())
3516  if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){
3517  const Expr *InitExpr = CLE->getInitializer();
3518  if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr))
3519  return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC);
3520  }
3521  // This expression must be an integer type.
3522  if (!getType()->isIntegerType() ||
3523  (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType()))
3524  return NPCK_NotNull;
3525 
3526  if (Ctx.getLangOpts().CPlusPlus11) {
3527  // C++11 [conv.ptr]p1: A null pointer constant is an integer literal with
3528  // value zero or a prvalue of type std::nullptr_t.
3529  // Microsoft mode permits C++98 rules reflecting MSVC behavior.
3530  const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(this);
3531  if (Lit && !Lit->getValue())
3532  return NPCK_ZeroLiteral;
3533  else if (!Ctx.getLangOpts().MSVCCompat || !isCXX98IntegralConstantExpr(Ctx))
3534  return NPCK_NotNull;
3535  } else {
3536  // If we have an integer constant expression, we need to *evaluate* it and
3537  // test for the value 0.
3538  if (!isIntegerConstantExpr(Ctx))
3539  return NPCK_NotNull;
3540  }
3541 
3542  if (EvaluateKnownConstInt(Ctx) != 0)
3543  return NPCK_NotNull;
3544 
3545  if (isa<IntegerLiteral>(this))
3546  return NPCK_ZeroLiteral;
3547  return NPCK_ZeroExpression;
3548 }
3549 
3550 /// If this expression is an l-value for an Objective C
3551 /// property, find the underlying property reference expression.
3553  const Expr *E = this;
3554  while (true) {
3555  assert((E->getValueKind() == VK_LValue &&
3556  E->getObjectKind() == OK_ObjCProperty) &&
3557  "expression is not a property reference");
3558  E = E->IgnoreParenCasts();
3559  if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
3560  if (BO->getOpcode() == BO_Comma) {
3561  E = BO->getRHS();
3562  continue;
3563  }
3564  }
3565 
3566  break;
3567  }
3568 
3569  return cast<ObjCPropertyRefExpr>(E);
3570 }
3571 
3572 bool Expr::isObjCSelfExpr() const {
3573  const Expr *E = IgnoreParenImpCasts();
3574 
3575  const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
3576  if (!DRE)
3577  return false;
3578 
3579  const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(DRE->getDecl());
3580  if (!Param)
3581  return false;
3582 
3583  const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Param->getDeclContext());
3584  if (!M)
3585  return false;
3586 
3587  return M->getSelfDecl() == Param;
3588 }
3589 
3591  Expr *E = this->IgnoreParens();
3592 
3593  while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
3594  if (ICE->getCastKind() == CK_LValueToRValue ||
3595  (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp))
3596  E = ICE->getSubExpr()->IgnoreParens();
3597  else
3598  break;
3599  }
3600 
3601  if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
3602  if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
3603  if (Field->isBitField())
3604  return Field;
3605 
3606  if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(E)) {
3607  FieldDecl *Ivar = IvarRef->getDecl();
3608  if (Ivar->isBitField())
3609  return Ivar;
3610  }
3611 
3612  if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) {
3613  if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl()))
3614  if (Field->isBitField())
3615  return Field;
3616 
3617  if (BindingDecl *BD = dyn_cast<BindingDecl>(DeclRef->getDecl()))
3618  if (Expr *E = BD->getBinding())
3619  return E->getSourceBitField();
3620  }
3621 
3622  if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) {
3623  if (BinOp->isAssignmentOp() && BinOp->getLHS())
3624  return BinOp->getLHS()->getSourceBitField();
3625 
3626  if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
3627  return BinOp->getRHS()->getSourceBitField();
3628  }
3629 
3630  if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(E))
3631  if (UnOp->isPrefix() && UnOp->isIncrementDecrementOp())
3632  return UnOp->getSubExpr()->getSourceBitField();
3633 
3634  return nullptr;
3635 }
3636 
3638  // FIXME: Why do we not just look at the ObjectKind here?
3639  const Expr *E = this->IgnoreParens();
3640 
3641  while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
3642  if (ICE->getValueKind() != VK_RValue &&
3643  ICE->getCastKind() == CK_NoOp)
3644  E = ICE->getSubExpr()->IgnoreParens();
3645  else
3646  break;
3647  }
3648 
3649  if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E))
3650  return ASE->getBase()->getType()->isVectorType();
3651 
3652  if (isa<ExtVectorElementExpr>(E))
3653  return true;
3654 
3655  if (auto *DRE = dyn_cast<DeclRefExpr>(E))
3656  if (auto *BD = dyn_cast<BindingDecl>(DRE->getDecl()))
3657  if (auto *E = BD->getBinding())
3658  return E->refersToVectorElement();
3659 
3660  return false;
3661 }
3662 
3664  const Expr *E = this->IgnoreParenImpCasts();
3665 
3666  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
3667  if (const auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
3668  if (VD->getStorageClass() == SC_Register &&
3669  VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
3670  return true;
3671 
3672  return false;
3673 }
3674 
3675 /// isArrow - Return true if the base expression is a pointer to vector,
3676 /// return false if the base expression is a vector.
3678  return getBase()->getType()->isPointerType();
3679 }
3680 
3682  if (const VectorType *VT = getType()->getAs<VectorType>())
3683  return VT->getNumElements();
3684  return 1;
3685 }
3686 
3687 /// containsDuplicateElements - Return true if any element access is repeated.
3689  // FIXME: Refactor this code to an accessor on the AST node which returns the
3690  // "type" of component access, and share with code below and in Sema.
3691  StringRef Comp = Accessor->getName();
3692 
3693  // Halving swizzles do not contain duplicate elements.
3694  if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
3695  return false;
3696 
3697  // Advance past s-char prefix on hex swizzles.
3698  if (Comp[0] == 's' || Comp[0] == 'S')
3699  Comp = Comp.substr(1);
3700 
3701  for (unsigned i = 0, e = Comp.size(); i != e; ++i)
3702  if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos)
3703  return true;
3704 
3705  return false;
3706 }
3707 
3708 /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
3710  SmallVectorImpl<uint32_t> &Elts) const {
3711  StringRef Comp = Accessor->getName();
3712  bool isNumericAccessor = false;
3713  if (Comp[0] == 's' || Comp[0] == 'S') {
3714  Comp = Comp.substr(1);
3715  isNumericAccessor = true;
3716  }
3717 
3718  bool isHi = Comp == "hi";
3719  bool isLo = Comp == "lo";
3720  bool isEven = Comp == "even";
3721  bool isOdd = Comp == "odd";
3722 
3723  for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
3724  uint64_t Index;
3725 
3726  if (isHi)
3727  Index = e + i;
3728  else if (isLo)
3729  Index = i;
3730  else if (isEven)
3731  Index = 2 * i;
3732  else if (isOdd)
3733  Index = 2 * i + 1;
3734  else
3735  Index = ExtVectorType::getAccessorIdx(Comp[i], isNumericAccessor);
3736 
3737  Elts.push_back(Index);
3738  }
3739 }
3740 
3742  QualType Type, SourceLocation BLoc,
3743  SourceLocation RP)
3744  : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary,
3745  Type->isDependentType(), Type->isDependentType(),
3746  Type->isInstantiationDependentType(),
3748  BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(args.size())
3749 {
3750  SubExprs = new (C) Stmt*[args.size()];
3751  for (unsigned i = 0; i != args.size(); i++) {
3752  if (args[i]->isTypeDependent())
3753  ExprBits.TypeDependent = true;
3754  if (args[i]->isValueDependent())
3755  ExprBits.ValueDependent = true;
3756  if (args[i]->isInstantiationDependent())
3757  ExprBits.InstantiationDependent = true;
3758  if (args[i]->containsUnexpandedParameterPack())
3759  ExprBits.ContainsUnexpandedParameterPack = true;
3760 
3761  SubExprs[i] = args[i];
3762  }
3763 }
3764 
3766  if (SubExprs) C.Deallocate(SubExprs);
3767 
3768  this->NumExprs = Exprs.size();
3769  SubExprs = new (C) Stmt*[NumExprs];
3770  memcpy(SubExprs, Exprs.data(), sizeof(Expr *) * Exprs.size());
3771 }
3772 
3773 GenericSelectionExpr::GenericSelectionExpr(
3774  const ASTContext &, SourceLocation GenericLoc, Expr *ControllingExpr,
3775  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
3776  SourceLocation DefaultLoc, SourceLocation RParenLoc,
3777  bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
3778  : Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
3779  AssocExprs[ResultIndex]->getValueKind(),
3780  AssocExprs[ResultIndex]->getObjectKind(),
3781  AssocExprs[ResultIndex]->isTypeDependent(),
3782  AssocExprs[ResultIndex]->isValueDependent(),
3783  AssocExprs[ResultIndex]->isInstantiationDependent(),
3784  ContainsUnexpandedParameterPack),
3785  NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
3786  DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
3787  assert(AssocTypes.size() == AssocExprs.size() &&
3788  "Must have the same number of association expressions"
3789  " and TypeSourceInfo!");
3790  assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
3791 
3792  GenericSelectionExprBits.GenericLoc = GenericLoc;
3793  getTrailingObjects<Stmt *>()[ControllingIndex] = ControllingExpr;
3794  std::copy(AssocExprs.begin(), AssocExprs.end(),
3795  getTrailingObjects<Stmt *>() + AssocExprStartIndex);
3796  std::copy(AssocTypes.begin(), AssocTypes.end(),
3797  getTrailingObjects<TypeSourceInfo *>());
3798 }
3799 
3800 GenericSelectionExpr::GenericSelectionExpr(
3801  const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
3802  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
3803  SourceLocation DefaultLoc, SourceLocation RParenLoc,
3804  bool ContainsUnexpandedParameterPack)
3805  : Expr(GenericSelectionExprClass, Context.DependentTy, VK_RValue,
3806  OK_Ordinary,
3807  /*isTypeDependent=*/true,
3808  /*isValueDependent=*/true,
3809  /*isInstantiationDependent=*/true, ContainsUnexpandedParameterPack),
3810  NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
3811  DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
3812  assert(AssocTypes.size() == AssocExprs.size() &&
3813  "Must have the same number of association expressions"
3814  " and TypeSourceInfo!");
3815 
3816  GenericSelectionExprBits.GenericLoc = GenericLoc;
3817  getTrailingObjects<Stmt *>()[ControllingIndex] = ControllingExpr;
3818  std::copy(AssocExprs.begin(), AssocExprs.end(),
3819  getTrailingObjects<Stmt *>() + AssocExprStartIndex);
3820  std::copy(AssocTypes.begin(), AssocTypes.end(),
3821  getTrailingObjects<TypeSourceInfo *>());
3822 }
3823 
3824 GenericSelectionExpr::GenericSelectionExpr(EmptyShell Empty, unsigned NumAssocs)
3825  : Expr(GenericSelectionExprClass, Empty), NumAssocs(NumAssocs) {}
3826 
3828  const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
3829  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
3830  SourceLocation DefaultLoc, SourceLocation RParenLoc,
3831  bool ContainsUnexpandedParameterPack, unsigned ResultIndex) {
3832  unsigned NumAssocs = AssocExprs.size();
3833  void *Mem = Context.Allocate(
3834  totalSizeToAlloc<Stmt *, TypeSourceInfo *>(1 + NumAssocs, NumAssocs),
3835  alignof(GenericSelectionExpr));
3836  return new (Mem) GenericSelectionExpr(
3837  Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
3838  RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
3839 }
3840 
3842  const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
3843  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
3844  SourceLocation DefaultLoc, SourceLocation RParenLoc,
3845  bool ContainsUnexpandedParameterPack) {
3846  unsigned NumAssocs = AssocExprs.size();
3847  void *Mem = Context.Allocate(
3848  totalSizeToAlloc<Stmt *, TypeSourceInfo *>(1 + NumAssocs, NumAssocs),
3849  alignof(GenericSelectionExpr));
3850  return new (Mem) GenericSelectionExpr(
3851  Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
3852  RParenLoc, ContainsUnexpandedParameterPack);
3853 }
3854 
3857  unsigned NumAssocs) {
3858  void *Mem = Context.Allocate(
3859  totalSizeToAlloc<Stmt *, TypeSourceInfo *>(1 + NumAssocs, NumAssocs),
3860  alignof(GenericSelectionExpr));
3861  return new (Mem) GenericSelectionExpr(EmptyShell(), NumAssocs);
3862 }
3863 
3864 //===----------------------------------------------------------------------===//
3865 // DesignatedInitExpr
3866 //===----------------------------------------------------------------------===//
3867 
3869  assert(Kind == FieldDesignator && "Only valid on a field designator");
3870  if (Field.NameOrField & 0x01)
3871  return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
3872  else
3873  return getField()->getIdentifier();
3874 }
3875 
3876 DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
3877  llvm::ArrayRef<Designator> Designators,
3878  SourceLocation EqualOrColonLoc,
3879  bool GNUSyntax,
3880  ArrayRef<Expr*> IndexExprs,
3881  Expr *Init)
3882  : Expr(DesignatedInitExprClass, Ty,
3883  Init->getValueKind(), Init->getObjectKind(),
3884  Init->isTypeDependent(), Init->isValueDependent(),
3885  Init->isInstantiationDependent(),
3887  EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
3888  NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
3889  this->Designators = new (C) Designator[NumDesignators];
3890 
3891  // Record the initializer itself.
3892  child_iterator Child = child_begin();
3893  *Child++ = Init;
3894 
3895  // Copy the designators and their subexpressions, computing
3896  // value-dependence along the way.
3897  unsigned IndexIdx = 0;
3898  for (unsigned I = 0; I != NumDesignators; ++I) {
3899  this->Designators[I] = Designators[I];
3900 
3901  if (this->Designators[I].isArrayDesignator()) {
3902  // Compute type- and value-dependence.
3903  Expr *Index = IndexExprs[IndexIdx];
3904  if (Index->isTypeDependent() || Index->isValueDependent())
3905  ExprBits.TypeDependent = ExprBits.ValueDependent = true;
3906  if (Index->isInstantiationDependent())
3907  ExprBits.InstantiationDependent = true;
3908  // Propagate unexpanded parameter packs.
3910  ExprBits.ContainsUnexpandedParameterPack = true;
3911 
3912  // Copy the index expressions into permanent storage.
3913  *Child++ = IndexExprs[IndexIdx++];
3914  } else if (this->Designators[I].isArrayRangeDesignator()) {
3915  // Compute type- and value-dependence.
3916  Expr *Start = IndexExprs[IndexIdx];
3917  Expr *End = IndexExprs[IndexIdx + 1];
3918  if (Start->isTypeDependent() || Start->isValueDependent() ||
3919  End->isTypeDependent() || End->isValueDependent()) {
3920  ExprBits.TypeDependent = ExprBits.ValueDependent = true;
3921  ExprBits.InstantiationDependent = true;
3922  } else if (Start->isInstantiationDependent() ||
3923  End->isInstantiationDependent()) {
3924  ExprBits.InstantiationDependent = true;
3925  }
3926 
3927  // Propagate unexpanded parameter packs.
3928  if (Start->containsUnexpandedParameterPack() ||
3930  ExprBits.ContainsUnexpandedParameterPack = true;
3931 
3932  // Copy the start/end expressions into permanent storage.
3933  *Child++ = IndexExprs[IndexIdx++];
3934  *Child++ = IndexExprs[IndexIdx++];
3935  }
3936  }
3937 
3938  assert(IndexIdx == IndexExprs.size() && "Wrong number of index expressions");
3939 }
3940 
3943  llvm::ArrayRef<Designator> Designators,
3944  ArrayRef<Expr*> IndexExprs,
3945  SourceLocation ColonOrEqualLoc,
3946  bool UsesColonSyntax, Expr *Init) {
3947  void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(IndexExprs.size() + 1),
3948  alignof(DesignatedInitExpr));
3949  return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
3950  ColonOrEqualLoc, UsesColonSyntax,
3951  IndexExprs, Init);
3952 }
3953 
3955  unsigned NumIndexExprs) {
3956  void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(NumIndexExprs + 1),
3957  alignof(DesignatedInitExpr));
3958  return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
3959 }
3960 
3962  const Designator *Desigs,
3963  unsigned NumDesigs) {
3964  Designators = new (C) Designator[NumDesigs];
3965  NumDesignators = NumDesigs;
3966  for (unsigned I = 0; I != NumDesigs; ++I)
3967  Designators[I] = Desigs[I];
3968 }
3969 
3971  DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
3972  if (size() == 1)
3973  return DIE->getDesignator(0)->getSourceRange();
3974  return SourceRange(DIE->getDesignator(0)->getBeginLoc(),
3975  DIE->getDesignator(size() - 1)->getEndLoc());
3976 }
3977 
3979  SourceLocation StartLoc;
3980  auto *DIE = const_cast<DesignatedInitExpr *>(this);
3981  Designator &First = *DIE->getDesignator(0);
3982  if (First.isFieldDesignator()) {
3983  if (GNUSyntax)
3985  else
3987  } else
3988  StartLoc =
3990  return StartLoc;
3991 }
3992 
3994  return getInit()->getEndLoc();
3995 }
3996 
3998  assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
3999  return getSubExpr(D.ArrayOrRange.Index + 1);
4000 }
4001 
4003  assert(D.Kind == Designator::ArrayRangeDesignator &&
4004  "Requires array range designator");
4005  return getSubExpr(D.ArrayOrRange.Index + 1);
4006 }
4007 
4009  assert(D.Kind == Designator::ArrayRangeDesignator &&
4010  "Requires array range designator");
4011  return getSubExpr(D.ArrayOrRange.Index + 2);
4012 }
4013 
4014 /// Replaces the designator at index @p Idx with the series
4015 /// of designators in [First, Last).
4017  const Designator *First,
4018  const Designator *Last) {
4019  unsigned NumNewDesignators = Last - First;
4020  if (NumNewDesignators == 0) {
4021  std::copy_backward(Designators + Idx + 1,
4022  Designators + NumDesignators,
4023  Designators + Idx);
4024  --NumNewDesignators;
4025  return;
4026  } else if (NumNewDesignators == 1) {
4027  Designators[Idx] = *First;
4028  return;
4029  }
4030 
4031  Designator *NewDesignators
4032  = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
4033  std::copy(Designators, Designators + Idx, NewDesignators);
4034  std::copy(First, Last, NewDesignators + Idx);
4035  std::copy(Designators + Idx + 1, Designators + NumDesignators,
4036  NewDesignators + Idx + NumNewDesignators);
4037  Designators = NewDesignators;
4038  NumDesignators = NumDesignators - 1 + NumNewDesignators;
4039 }
4040 
4042  SourceLocation lBraceLoc, Expr *baseExpr, SourceLocation rBraceLoc)
4043  : Expr(DesignatedInitUpdateExprClass, baseExpr->getType(), VK_RValue,
4045  BaseAndUpdaterExprs[0] = baseExpr;
4046 
4047  InitListExpr *ILE = new (C) InitListExpr(C, lBraceLoc, None, rBraceLoc);
4048  ILE->setType(baseExpr->getType());
4049  BaseAndUpdaterExprs[1] = ILE;
4050 }
4051 
4053  return getBase()->getBeginLoc();
4054 }
4055 
4057  return getBase()->getEndLoc();
4058 }
4059 
4060 ParenListExpr::ParenListExpr(SourceLocation LParenLoc, ArrayRef<Expr *> Exprs,
4061  SourceLocation RParenLoc)
4062  : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
4063  false, false),
4064  LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
4065  ParenListExprBits.NumExprs = Exprs.size();
4066 
4067  for (unsigned I = 0, N = Exprs.size(); I != N; ++I) {
4068  if (Exprs[I]->isTypeDependent())
4069  ExprBits.TypeDependent = true;
4070  if (Exprs[I]->isValueDependent())
4071  ExprBits.ValueDependent = true;
4072  if (Exprs[I]->isInstantiationDependent())
4073  ExprBits.InstantiationDependent = true;
4074  if (Exprs[I]->containsUnexpandedParameterPack())
4075  ExprBits.ContainsUnexpandedParameterPack = true;
4076 
4077  getTrailingObjects<Stmt *>()[I] = Exprs[I];
4078  }
4079 }
4080 
4081 ParenListExpr::ParenListExpr(EmptyShell Empty, unsigned NumExprs)
4082  : Expr(ParenListExprClass, Empty) {
4083  ParenListExprBits.NumExprs = NumExprs;
4084 }
4085 
4087  SourceLocation LParenLoc,
4088  ArrayRef<Expr *> Exprs,
4089  SourceLocation RParenLoc) {
4090  void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(Exprs.size()),
4091  alignof(ParenListExpr));
4092  return new (Mem) ParenListExpr(LParenLoc, Exprs, RParenLoc);
4093 }
4094 
4096  unsigned NumExprs) {
4097  void *Mem =
4098  Ctx.Allocate(totalSizeToAlloc<Stmt *>(NumExprs), alignof(ParenListExpr));
4099  return new (Mem) ParenListExpr(EmptyShell(), NumExprs);
4100 }
4101 
4103  if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e))
4104  e = ewc->getSubExpr();
4105  if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e))
4106  e = m->GetTemporaryExpr();
4107  e = cast<CXXConstructExpr>(e)->getArg(0);
4108  while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
4109  e = ice->getSubExpr();
4110  return cast<OpaqueValueExpr>(e);
4111 }
4112 
4114  EmptyShell sh,
4115  unsigned numSemanticExprs) {
4116  void *buffer =
4117  Context.Allocate(totalSizeToAlloc<Expr *>(1 + numSemanticExprs),
4118  alignof(PseudoObjectExpr));
4119  return new(buffer) PseudoObjectExpr(sh, numSemanticExprs);
4120 }
4121 
4122 PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs)
4123  : Expr(PseudoObjectExprClass, shell) {
4124  PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1;
4125 }
4126 
4128  ArrayRef<Expr*> semantics,
4129  unsigned resultIndex) {
4130  assert(syntax && "no syntactic expression!");
4131  assert(semantics.size() && "no semantic expressions!");
4132 
4133  QualType type;
4134  ExprValueKind VK;
4135  if (resultIndex == NoResult) {
4136  type = C.VoidTy;
4137  VK = VK_RValue;
4138  } else {
4139  assert(resultIndex < semantics.size());
4140  type = semantics[resultIndex]->getType();
4141  VK = semantics[resultIndex]->getValueKind();
4142  assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary);
4143  }
4144 
4145  void *buffer = C.Allocate(totalSizeToAlloc<Expr *>(semantics.size() + 1),
4146  alignof(PseudoObjectExpr));
4147  return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics,
4148  resultIndex);
4149 }
4150 
4151 PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK,
4152  Expr *syntax, ArrayRef<Expr*> semantics,
4153  unsigned resultIndex)
4154  : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary,
4155  /*filled in at end of ctor*/ false, false, false, false) {
4156  PseudoObjectExprBits.NumSubExprs = semantics.size() + 1;
4157  PseudoObjectExprBits.ResultIndex = resultIndex + 1;
4158 
4159  for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) {
4160  Expr *E = (i == 0 ? syntax : semantics[i-1]);
4161  getSubExprsBuffer()[i] = E;
4162 
4163  if (E->isTypeDependent())
4164  ExprBits.TypeDependent = true;
4165  if (E->isValueDependent())
4166  ExprBits.ValueDependent = true;
4168  ExprBits.InstantiationDependent = true;
4170  ExprBits.ContainsUnexpandedParameterPack = true;
4171 
4172  if (isa<OpaqueValueExpr>(E))
4173  assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != nullptr &&
4174  "opaque-value semantic expressions for pseudo-object "
4175  "operations must have sources");
4176  }
4177 }
4178 
4179 //===----------------------------------------------------------------------===//
4180 // Child Iterators for iterating over subexpressions/substatements
4181 //===----------------------------------------------------------------------===//
4182 
4183 // UnaryExprOrTypeTraitExpr
4185  const_child_range CCR =
4186  const_cast<const UnaryExprOrTypeTraitExpr *>(this)->children();
4187  return child_range(cast_away_const(CCR.begin()), cast_away_const(CCR.end()));
4188 }
4189 
4191  // If this is of a type and the type is a VLA type (and not a typedef), the
4192  // size expression of the VLA needs to be treated as an executable expression.
4193  // Why isn't this weirdness documented better in StmtIterator?
4194  if (isArgumentType()) {
4195  if (const VariableArrayType *T =
4196  dyn_cast<VariableArrayType>(getArgumentType().getTypePtr()))
4199  }
4200  return const_child_range(&Argument.Ex, &Argument.Ex + 1);
4201 }
4202 
4204  QualType t, AtomicOp op, SourceLocation RP)
4205  : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary,
4206  false, false, false, false),
4207  NumSubExprs(args.size()), BuiltinLoc(BLoc), RParenLoc(RP), Op(op)
4208 {
4209  assert(args.size() == getNumSubExprs(op) && "wrong number of subexpressions");
4210  for (unsigned i = 0; i != args.size(); i++) {
4211  if (args[i]->isTypeDependent())
4212  ExprBits.TypeDependent = true;
4213  if (args[i]->isValueDependent())
4214  ExprBits.ValueDependent = true;
4215  if (args[i]->isInstantiationDependent())
4216  ExprBits.InstantiationDependent = true;
4217  if (args[i]->containsUnexpandedParameterPack())
4218  ExprBits.ContainsUnexpandedParameterPack = true;
4219 
4220  SubExprs[i] = args[i];
4221  }
4222 }
4223 
4225  switch (Op) {
4226  case AO__c11_atomic_init:
4227  case AO__opencl_atomic_init:
4228  case AO__c11_atomic_load:
4229  case AO__atomic_load_n:
4230  return 2;
4231 
4232  case AO__opencl_atomic_load:
4233  case AO__c11_atomic_store:
4234  case AO__c11_atomic_exchange:
4235  case AO__atomic_load:
4236  case AO__atomic_store:
4237  case AO__atomic_store_n:
4238  case AO__atomic_exchange_n:
4239  case AO__c11_atomic_fetch_add:
4240  case AO__c11_atomic_fetch_sub:
4241  case AO__c11_atomic_fetch_and:
4242  case AO__c11_atomic_fetch_or:
4243  case AO__c11_atomic_fetch_xor:
4244  case AO__atomic_fetch_add:
4245  case AO__atomic_fetch_sub:
4246  case AO__atomic_fetch_and:
4247  case AO__atomic_fetch_or:
4248  case AO__atomic_fetch_xor:
4249  case AO__atomic_fetch_nand:
4250  case AO__atomic_add_fetch:
4251  case AO__atomic_sub_fetch:
4252  case AO__atomic_and_fetch:
4253  case AO__atomic_or_fetch:
4254  case AO__atomic_xor_fetch:
4255  case AO__atomic_nand_fetch:
4256  case AO__atomic_fetch_min:
4257  case AO__atomic_fetch_max:
4258  return 3;
4259 
4260  case AO__opencl_atomic_store:
4261  case AO__opencl_atomic_exchange:
4262  case AO__opencl_atomic_fetch_add:
4263  case AO__opencl_atomic_fetch_sub:
4264  case AO__opencl_atomic_fetch_and:
4265  case AO__opencl_atomic_fetch_or:
4266  case AO__opencl_atomic_fetch_xor:
4267  case AO__opencl_atomic_fetch_min:
4268  case AO__opencl_atomic_fetch_max:
4269  case AO__atomic_exchange:
4270  return 4;
4271 
4272  case AO__c11_atomic_compare_exchange_strong:
4273  case AO__c11_atomic_compare_exchange_weak:
4274  return 5;
4275 
4276  case AO__opencl_atomic_compare_exchange_strong:
4277  case AO__opencl_atomic_compare_exchange_weak:
4278  case AO__atomic_compare_exchange:
4279  case AO__atomic_compare_exchange_n:
4280  return 6;
4281  }
4282  llvm_unreachable("unknown atomic op");
4283 }
4284 
4286  auto T = getPtr()->getType()->castAs<PointerType>()->getPointeeType();
4287  if (auto AT = T->getAs<AtomicType>())
4288  return AT->getValueType();
4289  return T;
4290 }
4291 
4293  unsigned ArraySectionCount = 0;
4294  while (auto *OASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParens())) {
4295  Base = OASE->getBase();
4296  ++ArraySectionCount;
4297  }
4298  while (auto *ASE =
4299  dyn_cast<ArraySubscriptExpr>(Base->IgnoreParenImpCasts())) {
4300  Base = ASE->getBase();
4301  ++ArraySectionCount;
4302  }
4303  Base = Base->IgnoreParenImpCasts();
4304  auto OriginalTy = Base->getType();
4305  if (auto *DRE = dyn_cast<DeclRefExpr>(Base))
4306  if (auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl()))
4307  OriginalTy = PVD->getOriginalType().getNonReferenceType();
4308 
4309  for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
4310  if (OriginalTy->isAnyPointerType())
4311  OriginalTy = OriginalTy->getPointeeType();
4312  else {
4313  assert (OriginalTy->isArrayType());
4314  OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();
4315  }
4316  }
4317  return OriginalTy;
4318 }
child_iterator child_begin()
Definition: Stmt.h:1123
CallExpr(StmtClass SC, Expr *Fn, ArrayRef< Expr *> PreArgs, ArrayRef< Expr *> Args, QualType Ty, ExprValueKind VK, SourceLocation RParenLoc, unsigned MinNumArgs, ADLCallKind UsesADL)
Build a call expression, assuming that appropriate storage has been allocated for the trailing object...
Definition: Expr.cpp:1236
ObjCPropertyRefExpr - A dot-syntax expression to access an ObjC property.
Definition: ExprObjC.h:614
A call to an overloaded operator written using operator syntax.
Definition: ExprCXX.h:77
bool hasArrayFiller() const
Return true if this is an array initializer and its array "filler" has been set.
Definition: Expr.h:4323
SourceLocation getLocForStartOfFile(FileID FID) const
Return the source location corresponding to the first byte of the specified file. ...
Represents a single C99 designator.
Definition: Expr.h:4528
SourceLocation getLoc() const
getLoc - Returns the main location of the declaration name.
void setValueDependent(bool VD)
Set whether this expression is value-dependent or not.
Definition: Expr.h:154
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Defines the clang::ASTContext interface.
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:464
static Expr * IgnoreImpCastsExtraSingleStep(Expr *E)
Definition: Expr.cpp:2573
static Expr * IgnoreNoopCastsSingleStep(const ASTContext &Ctx, Expr *E)
Definition: Expr.cpp:2665
const CXXDestructorDecl * getDestructor() const
Definition: ExprCXX.h:1249
Represents a function declaration or definition.
Definition: Decl.h:1737
Expr * getArrayIndex(const Designator &D) const
Definition: Expr.cpp:3997
Stmt * body_back()
Definition: Stmt.h:1303
FunctionTemplateDecl * getTemplate() const
Retrieve the template from which this function was specialized.
Definition: DeclTemplate.h:549
bool hasAttr(attr::Kind AK) const
Determine whether this type had the specified attribute applied to it (looking through top-level type...
Definition: Type.cpp:1652
static void computeDeclRefDependence(const ASTContext &Ctx, NamedDecl *D, QualType T, bool &TypeDependent, bool &ValueDependent, bool &InstantiationDependent)
Compute the type-, value-, and instantiation-dependence of a declaration reference based on the decla...
Definition: Expr.cpp:234
bool isFixedPointType() const
Return true if this is a fixed point type according to ISO/IEC JTC1 SC22 WG14 N1169.
Definition: Type.h:6607
Expr * getLHS() const
Definition: Expr.h:3661
StringRef Identifier
Definition: Format.cpp:1714
Expr * getSyntacticForm()
Return the syntactic form of this expression, i.e.
Definition: Expr.h:5555
Lexer - This provides a simple interface that turns a text buffer into a stream of tokens...
Definition: Lexer.h:76
SourceLocation getRParenLoc() const
Definition: Expr.h:2678
void setArrayFiller(Expr *filler)
Definition: Expr.cpp:2038
const FunctionProtoType * getFunctionType() const
getFunctionType - Return the underlying function type for this block.
Definition: Expr.cpp:2134
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T -> getSizeExpr()))
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2549
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:3978
QualType getPointeeType() const
Definition: Type.h:2562
A (possibly-)qualified type.
Definition: Type.h:639
unsigned getOffsetOfStringByte(const Token &TheTok, unsigned ByteNo) const
getOffsetOfStringByte - This function returns the offset of the specified byte of the string data rep...
bool isArrayType() const
Definition: Type.h:6357
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
Definition: Expr.h:2591
const DeclarationNameLoc & getInfo() const
MangleContext * createMangleContext(const TargetInfo *T=nullptr)
If T is null pointer, assume the target in ASTContext.
Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack)
Definition: Expr.h:112
__SIZE_TYPE__ size_t
The unsigned integer type of the result of the sizeof operator.
Definition: opencl-c.h:67
static Decl * castFromDeclContext(const DeclContext *)
Definition: DeclBase.cpp:871
unsigned FieldLoc
The location of the field name in the designated initializer.
Definition: Expr.h:4505
const Expr * getInit(unsigned Init) const
Definition: Expr.h:4267
bool EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
EvaluateAsInt - Return true if this is a constant which we can fold and convert to an integer...
Stmt - This represents one statement.
Definition: Stmt.h:65
DesignatedInitUpdateExpr(const ASTContext &C, SourceLocation lBraceLoc, Expr *baseExprs, SourceLocation rBraceLoc)
Definition: Expr.cpp:4041
unsigned getNumArgs() const
getNumArgs - Return the number of actual arguments to this call.
Definition: Expr.h:2578
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3367
SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, const LangOptions &Features, const TargetInfo &Target, unsigned *StartToken=nullptr, unsigned *StartTokenByteOffset=nullptr) const
getLocationOfByte - Return a source location that points to the specified byte of this string literal...
Definition: Expr.cpp:1117
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:505
static CallExpr * CreateTemporary(void *Mem, Expr *Fn, QualType Ty, ExprValueKind VK, SourceLocation RParenLoc, ADLCallKind UsesADL=NotADL)
Create a temporary call expression with no arguments in the memory pointed to by Mem.
Definition: Expr.cpp:1295
bool hasPlaceholderType() const
Returns whether this expression has a placeholder type.
Definition: Expr.h:474
Defines the SourceManager interface.
bool hasNonTrivialCall(const ASTContext &Ctx) const
Determine whether this expression involves a call to any function that is not trivial.
Definition: Expr.cpp:3421
bool isRecordType() const
Definition: Type.h:6381
reverse_iterator rbegin()
Definition: ASTVector.h:103
Expr * getBase() const
Definition: Expr.h:2810
unsigned size() const
Retrieve the number of template arguments in this template argument list.
Definition: DeclTemplate.h:269
bool isSpecificPlaceholderType(unsigned K) const
Test for a specific placeholder type.
Definition: Type.h:6547
void setSemantics(const llvm::fltSemantics &Sem)
Set the APFloat semantics this literal uses.
Definition: Expr.cpp:875
static unsigned sizeOfTrailingObjects(unsigned NumPreArgs, unsigned NumArgs)
Return the size in bytes needed for the trailing objects.
Definition: Expr.h:2498
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:87
FloatingLiteralBitfields FloatingLiteralBits
Definition: Stmt.h:924
void getEncodedElementAccess(SmallVectorImpl< uint32_t > &Elts) const
getEncodedElementAccess - Encode the elements accessed into an llvm aggregate Constant of ConstantInt...
Definition: Expr.cpp:3709
void setType(QualType t)
Definition: Expr.h:131
bool isTransparent() const
Is this a transparent initializer list (that is, an InitListExpr that is purely syntactic, and whose semantics are that of the sole contained initializer)?
Definition: Expr.cpp:2062
Defines the C++ template declaration subclasses.
Opcode getOpcode() const
Definition: Expr.h:3353
Classification Classify(ASTContext &Ctx) const
Classify - Classify this expression according to the C++11 expression taxonomy.
Definition: Expr.h:379
iterator insert(const ASTContext &C, iterator I, const T &Elt)
Definition: ASTVector.h:219
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1882
NamedDecl * getDecl() const
The base class of the type hierarchy.
Definition: Type.h:1414
SourceLocation getBeginLoc() const
getBeginLoc - Retrieve the location of the first token.
bool isSemanticForm() const
Definition: Expr.h:4369
bool hasExplicitTemplateArgs() const
Determines whether this declaration reference was followed by an explicit template argument list...
Definition: Expr.h:1228
llvm::iterator_range< child_iterator > child_range
Definition: Stmt.h:1113
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2824
DeclRefExprBitfields DeclRefExprBits
Definition: Stmt.h:923
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1319
SourceLocation getEndLoc() const LLVM_READONLY
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:397
NamedDecl * getParam(unsigned Idx)
Definition: DeclTemplate.h:132
SourceLocation getLParenLoc() const
Definition: Expr.h:3281
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:689
A container of type source information.
Definition: Decl.h:86
bool containsDuplicateElements() const
containsDuplicateElements - Return true if any element access is repeated.
Definition: Expr.cpp:3688
unsigned getCharWidth() const
Definition: TargetInfo.h:380
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2491
Represents a prvalue temporary that is written into memory so that a reference can bind to it...
Definition: ExprCXX.h:4309
const Attr * getUnusedResultAttr(const ASTContext &Ctx) const
Returns the WarnUnusedResultAttr that is either declared on the called function, or its return type d...
Definition: Expr.cpp:1416
Expr * ignoreParenBaseCasts() LLVM_READONLY
Skip past any parentheses and derived-to-base casts until reaching a fixed point. ...
Definition: Expr.cpp:2745
QualType getElementType() const
Definition: Type.h:2859
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Expr.cpp:469
StringRef getBufferData(FileID FID, bool *Invalid=nullptr) const
Return a StringRef to the source buffer data for the specified FileID.
static OffsetOfExpr * CreateEmpty(const ASTContext &C, unsigned NumComps, unsigned NumExprs)
Definition: Expr.cpp:1461
static const OpaqueValueExpr * findInCopyConstruct(const Expr *expr)
Given an expression which invokes a copy constructor — i.e.
Definition: Expr.cpp:4102
Represents a variable declaration or definition.
Definition: Decl.h:812
const ObjCPropertyRefExpr * getObjCProperty() const
If this expression is an l-value for an Objective C property, find the underlying property reference ...
Definition: Expr.cpp:3552
CompoundLiteralExpr - [C99 6.5.2.5].
Definition: Expr.h:2968
bool isEnumeralType() const
Definition: Type.h:6385
const internal::VariadicDynCastAllOfMatcher< Stmt, Expr > expr
Matches expressions.
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6768
const ArrayType * castAsArrayTypeUnsafe() const
A variant of castAs<> for array type which silently discards qualifiers from the outermost type...
Definition: Type.h:6840
void resizeInits(const ASTContext &Context, unsigned NumInits)
Specify the number of initializers.
Definition: Expr.cpp:2022
void setInit(unsigned Init, Expr *expr)
Definition: Expr.h:4277
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:138
static PredefinedExpr * CreateEmpty(const ASTContext &Ctx, bool HasFunctionName)
Create an empty PredefinedExpr.
Definition: Expr.cpp:505
size_type size() const
Definition: ASTVector.h:109
bool isIdiomaticZeroInitializer(const LangOptions &LangOpts) const
Is this the zero initializer {0} in a language which considers it idiomatic?
Definition: Expr.cpp:2085
Stores a list of template parameters for a TemplateDecl and its derived classes.
Definition: DeclTemplate.h:67
static DeclRefExpr * CreateEmpty(const ASTContext &Context, bool HasQualifier, bool HasFoundDecl, bool HasTemplateKWAndArgsInfo, unsigned NumTemplateArgs)
Construct an empty declaration reference expression.
Definition: Expr.cpp:449
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:37
Represents an expression – generally a full-expression – that introduces cleanups to be run at the ...
Definition: ExprCXX.h:3196
static bool isAssignmentOp(Opcode Opc)
Definition: Expr.h:3444
Defines the clang::Expr interface and subclasses for C++ expressions.
The collection of all-type qualifiers we support.
Definition: Type.h:137
FieldDecl * getSourceBitField()
If this expression refers to a bit-field, retrieve the declaration of that bit-field.
Definition: Expr.cpp:3590
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:269
LabelStmt - Represents a label, which has a substatement.
Definition: Stmt.h:1650
Represents a struct/union/class.
Definition: Decl.h:3592
Represents a C99 designated initializer expression.
Definition: Expr.h:4453
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:297
One of these records is kept for each identifier that is lexed.
Represents a class template specialization, which refers to a class template with a given set of temp...
unsigned GetStringLength() const
const Expr * getBestDynamicClassTypeExpr() const
Get the inner expression that determines the best dynamic class.
Definition: Expr.cpp:36
const TemplateArgument & get(unsigned Idx) const
Retrieve the template argument at a given index.
Definition: DeclTemplate.h:254
StmtIterator cast_away_const(const ConstStmtIterator &RHS)
Definition: StmtIterator.h:151
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.
LValueClassification ClassifyLValue(ASTContext &Ctx) const
Reasons why an expression might not be an l-value.
static constexpr ADLCallKind UsesADL
Definition: Expr.h:2483
Used for GCC&#39;s __alignof.
Definition: TypeTraits.h:106
unsigned getChar32Width() const
getChar32Width/Align - Return the size of &#39;char32_t&#39; for this target, in bits.
Definition: TargetInfo.h:566
bool isCharType() const
Definition: Type.cpp:1809
field_range fields() const
Definition: Decl.h:3783
static SourceLocation getFromRawEncoding(unsigned Encoding)
Turn a raw encoding of a SourceLocation object into a real SourceLocation.
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:263
NameKind getNameKind() const
Determine what kind of name this is.
Represents a member of a struct/union/class.
Definition: Decl.h:2578
static DesignatedInitExpr * Create(const ASTContext &C, llvm::ArrayRef< Designator > Designators, ArrayRef< Expr *> IndexExprs, SourceLocation EqualOrColonLoc, bool GNUSyntax, Expr *Init)
Definition: Expr.cpp:3942
UnaryExprOrTypeTrait
Names for the "expression or type" traits.
Definition: TypeTraits.h:96
static Expr * IgnoreLValueCastsSingleStep(Expr *E)
Definition: Expr.cpp:2606
bool isReferenceType() const
Definition: Type.h:6320
void setArg(unsigned Arg, Expr *ArgExpr)
setArg - Set the specified argument.
Definition: Expr.h:2601
Token - This structure provides full information about a lexed token.
Definition: Token.h:34
static DeclRefExpr * Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *D, bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc, QualType T, ExprValueKind VK, NamedDecl *FoundD=nullptr, const TemplateArgumentListInfo *TemplateArgs=nullptr)
Definition: Expr.cpp:405
Expr * getSubExpr()
Definition: Expr.h:3093
bool isArrow() const
isArrow - Return true if the base expression is a pointer to vector, return false if the base express...
Definition: Expr.cpp:3677
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:49
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:6664
NestedNameSpecifierLoc QualifierLoc
The nested-name-specifier that qualifies the name, including source-location information.
Definition: Expr.h:2716
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:109
struct FieldDesignator Field
A field designator, e.g., ".x".
Definition: Expr.h:4538
const Expr *const * const_semantics_iterator
Definition: Expr.h:5578
ShuffleVectorExpr(const ASTContext &C, ArrayRef< Expr *> args, QualType Type, SourceLocation BLoc, SourceLocation RP)
Definition: Expr.cpp:3741
Provides information about a function template specialization, which is a FunctionDecl that has been ...
Definition: DeclTemplate.h:507
StringRef getOpcodeStr() const
Definition: Expr.h:3374
bool isGLValue() const
Definition: Expr.h:254
static ParenListExpr * Create(const ASTContext &Ctx, SourceLocation LParenLoc, ArrayRef< Expr *> Exprs, SourceLocation RParenLoc)
Create a paren list.
Definition: Expr.cpp:4086
Describes an C or C++ initializer list.
Definition: Expr.h:4219
const TemplateArgumentList * TemplateArguments
The template arguments used to produce the function template specialization from the function templat...
Definition: DeclTemplate.h:539
bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const
EvaluateAsBooleanCondition - Return true if this is a constant which we can fold and convert to a boo...
void setValue(const ASTContext &C, const llvm::APInt &Val)
Definition: Expr.h:1326
BinaryOperatorKind
static FixedPointLiteral * CreateFromRawInt(const ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l, unsigned Scale)
Definition: Expr.cpp:813
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2656
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Expr.cpp:3993
An lvalue ref-qualifier was provided (&).
Definition: Type.h:1370
Base object ctor.
Definition: ABI.h:26
A convenient class for passing around template argument information.
Definition: TemplateBase.h:554
static Expr * IgnoreCastsSingleStep(Expr *E)
Definition: Expr.cpp:2590
Qualifiers::GC getObjCGCAttrKind(QualType Ty) const
Return one of the GCNone, Weak or Strong Objective-C garbage collection attributes.
Expr * getPtr() const
Definition: Expr.h:5677
const ArrayType * getAsArrayTypeUnsafe() const
A variant of getAs<> for array types which silently discards qualifiers from the outermost type...
Definition: Type.h:6817
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:407
NullPointerConstantValueDependence
Enumeration used to describe how isNullPointerConstant() should cope with value-dependent expressions...
Definition: Expr.h:717
unsigned getNumPreArgs() const
Definition: Expr.h:2515
bool containsUnexpandedParameterPack() const
Whether this type is or contains an unexpanded parameter pack, used to support C++0x variadic templat...
Definition: Type.h:1840
static bool isRecordType(QualType T)
semantics_iterator semantics_end()
Definition: Expr.h:5585
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3318
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6154
child_range children()
Definition: Expr.h:4402
bool isBoundMemberFunction(ASTContext &Ctx) const
Returns true if this expression is a bound member function.
Definition: Expr.cpp:2533
Expr * IgnoreParenCasts() LLVM_READONLY
Skip past any parentheses and casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2728
StringKind
StringLiteral is followed by several trailing objects.
Definition: Expr.h:1621
field_iterator field_begin() const
Definition: Decl.cpp:4168
SourceLocation getCaretLocation() const
Definition: Expr.cpp:2140
static SourceLocation AdvanceToTokenCharacter(SourceLocation TokStart, unsigned Characters, const SourceManager &SM, const LangOptions &LangOpts)
AdvanceToTokenCharacter - If the current SourceLocation specifies a location at the start of a token...
Definition: Lexer.h:348
static bool isBooleanType(QualType Ty)
An adjustment to be made to the temporary created when emitting a reference binding, which accesses a particular subobject of that temporary.
Definition: Expr.h:63
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3041
Represents binding an expression to a temporary.
Definition: ExprCXX.h:1270
SourceLocation getSpellingLoc(SourceLocation Loc) const
Given a SourceLocation object, return the spelling location referenced by the ID. ...
CXXTemporary * getTemporary()
Definition: ExprCXX.h:1289
bool isCXX98IntegralConstantExpr(const ASTContext &Ctx) const
isCXX98IntegralConstantExpr - Return true if this expression is an integral constant expression in C+...
A C++ lambda expression, which produces a function object (of unspecified type) that can be invoked l...
Definition: ExprCXX.h:1715
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1477
static IntegerLiteral * Create(const ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l)
Returns a new integer literal with value &#39;V&#39; and type &#39;type&#39;.
Definition: Expr.cpp:791
NestedNameSpecifierLoc getQualifierLoc() const
If the name was qualified, retrieves the nested-name-specifier that precedes the name, with source-location information.
Definition: Expr.h:1166
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
An ordinary object is located at an address in memory.
Definition: Specifiers.h:125
Represents the body of a CapturedStmt, and serves as its DeclContext.
Definition: Decl.h:4050
Represents an ObjC class declaration.
Definition: DeclObjC.h:1171
SourceLocation getOperatorLoc() const
getOperatorLoc - Return the location of the operator.
Definition: Expr.h:1968
unsigned getBuiltinID(bool ConsiderWrapperFunctions=false) const
Returns a value indicating whether this function corresponds to a builtin function.
Definition: Decl.cpp:3011
Expression is a GNU-style __null constant.
Definition: Expr.h:712
StmtClass
Definition: Stmt.h:67
const Stmt * getBody() const
Definition: Expr.cpp:2143
A binding in a decomposition declaration.
Definition: DeclCXX.h:3802
bool isUnevaluated(unsigned ID) const
Returns true if this builtin does not perform the side-effects of its arguments.
Definition: Builtins.h:127
A default argument (C++ [dcl.fct.default]).
Definition: ExprCXX.h:1118
static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix)
Retrieve the unary opcode that corresponds to the given overloaded operator.
Definition: Expr.cpp:1201
void setIntValue(const ASTContext &C, const llvm::APInt &Val)
Definition: Expr.cpp:762
Expr * IgnoreImpCasts() LLVM_READONLY
Skip past any implicit casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2707
bool isObjCSelfExpr() const
Check if this expression is the ObjC &#39;self&#39; implicit parameter.
Definition: Expr.cpp:3572
Represents the this expression in C++.
Definition: ExprCXX.h:1013
static bool isNullPointerArithmeticExtension(ASTContext &Ctx, Opcode Opc, Expr *LHS, Expr *RHS)
Definition: Expr.cpp:1963
Represents an explicit template argument list in C++, e.g., the "<int>" in "sort<int>".
Definition: TemplateBase.h:650
PredefinedExprBitfields PredefinedExprBits
Definition: Stmt.h:922
QualType getTypeAsWritten() const
getTypeAsWritten - Returns the type that this expression is casting to, as written in the source code...
Definition: Expr.h:3244
bool isInstantiationDependent() const
Whether this nested name specifier involves a template parameter.
void print(const PrintingPolicy &Policy, raw_ostream &Out) const
Print this template argument to the given output stream.
bool isUnevaluatedBuiltinCall(const ASTContext &Ctx) const
Returns true if this is a call to a builtin which does not evaluate side-effects within its arguments...
Definition: Expr.cpp:1391
bool hasAttr() const
Definition: DeclBase.h:534
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:3616
llvm::iterator_range< const_child_iterator > const_child_range
Definition: Stmt.h:1114
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:1265
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1635
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3699
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 ...
CXXConstructorDecl * getConstructor() const
Get the constructor that this expression will (ultimately) call.
Definition: ExprCXX.h:1391
CastKind
CastKind - The kind of operation required for a conversion.
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1847
Specifies that the expression should never be value-dependent.
Definition: Expr.h:719
UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) expression operand...
Definition: Expr.h:2260
iterator end()
Definition: ASTVector.h:99
InitListExpr * getUpdater() const
Definition: Expr.h:4805
void outputString(raw_ostream &OS) const
Definition: Expr.cpp:1004
llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx, SmallVectorImpl< PartialDiagnosticAt > *Diag=nullptr) const
EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded integer.
ConstStmtIterator const_child_iterator
Definition: Stmt.h:1111
unsigned Offset
Definition: Format.cpp:1709
bool HasSideEffects(const ASTContext &Ctx, bool IncludePossibleEffects=true) const
HasSideEffects - This routine returns true for all those expressions which have any effect other than...
Definition: Expr.cpp:3096
Exposes information about the current target.
Definition: TargetInfo.h:161
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:135
TemplateParameterList * getTemplateParameters() const
Get the list of template parameters.
Definition: DeclTemplate.h:431
static StringLiteral * Create(const ASTContext &Ctx, StringRef Str, StringKind Kind, bool Pascal, QualType Ty, const SourceLocation *Loc, unsigned NumConcatenated)
This is the "fully general" constructor that allows representation of strings formed from multiple co...
Definition: Expr.cpp:982
static CallExpr * Create(const ASTContext &Ctx, Expr *Fn, ArrayRef< Expr *> Args, QualType Ty, ExprValueKind VK, SourceLocation RParenLoc, unsigned MinNumArgs=0, ADLCallKind UsesADL=NotADL)
Create a call expression.
Definition: Expr.cpp:1282
QualType getCXXNameType() const
If this name is one of the C++ names (of a constructor, destructor, or conversion function)...
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
void setDesignators(const ASTContext &C, const Designator *Desigs, unsigned NumDesigs)
Definition: Expr.cpp:3961
SourceLocation End
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:106
void setCallee(Expr *F)
Definition: Expr.h:2554
static Expr * IgnoreExprNodesImpl(Expr *E)
Definition: Expr.cpp:2688
std::string Label
IdentifierInfo * getFieldName() const
For a field or identifier offsetof node, returns the name of the field.
Definition: Expr.cpp:1494
static Expr * IgnoreImpCastsSingleStep(Expr *E)
Definition: Expr.cpp:2563
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Expr.cpp:1615
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6831
SourceLocation getBeginLoc() const
Retrieve the location of the beginning of this nested-name-specifier.
void setTypeDependent(bool TD)
Set whether this expression is type-dependent or not.
Definition: Expr.h:172
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2713
Expr * getCallee()
Definition: Expr.h:2552
unsigned getNumInits() const
Definition: Expr.h:4249
const Expr * skipRValueSubobjectAdjustments() const
Definition: Expr.h:893
field_iterator field_end() const
Definition: Decl.h:3786
DeclContext * getDeclContext()
Definition: DeclBase.h:430
ExprBitfields ExprBits
Definition: Stmt.h:921
bool hasQualifier() const
Determine whether this declaration reference was preceded by a C++ nested-name-specifier, e.g., N::foo.
Definition: Expr.h:1162
static OverloadedOperatorKind getOverloadedOperator(Opcode Opc)
Retrieve the overloaded operator kind that corresponds to the given unary opcode. ...
Definition: Expr.cpp:1216
static FloatingLiteral * Create(const ASTContext &C, const llvm::APFloat &V, bool isexact, QualType Type, SourceLocation L)
Definition: Expr.cpp:847
Represents the type decltype(expr) (C++11).
Definition: Type.h:4258
void getAsStringInternal(std::string &Str, const PrintingPolicy &Policy) const
ArrayRef< Expr * > inits()
Definition: Expr.h:4259
Specifies that a value-dependent expression of integral or dependent type should be considered a null...
Definition: Expr.h:723
Extra data stored in some MemberExpr objects.
Definition: Expr.h:2713
bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const
Determine whether the result of this expression is a temporary object of the given class type...
Definition: Expr.cpp:2795
Base object dtor.
Definition: ABI.h:36
QualType getType() const
Definition: Expr.h:130
StringLiteralBitfields StringLiteralBits
Definition: Stmt.h:925
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1761
static PredefinedExpr * Create(const ASTContext &Ctx, SourceLocation L, QualType FNTy, IdentKind IK, StringLiteral *SL)
Create a PredefinedExpr.
Definition: Expr.cpp:496
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:950
InitListExpr(const ASTContext &C, SourceLocation lbraceloc, ArrayRef< Expr *> initExprs, SourceLocation rbraceloc)
Definition: Expr.cpp:1995
Expr * getSubExprAsWritten()
Retrieve the cast subexpression as it was written in the source code, looking through any implicit ca...
Definition: Expr.cpp:1770
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:1934
unsigned Index
Location of the first index expression within the designated initializer expression&#39;s list of subexpr...
Definition: Expr.h:4512
Represents a GCC generic vector type.
Definition: Type.h:3180
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:4629
Represents a reference to a non-type template parameter that has been substituted with a template arg...
Definition: ExprCXX.h:4099
bool isDependentContext() const
Determines whether this context is dependent on a template parameter.
Definition: DeclBase.cpp:1093
Allow UB that we can give a value, but not arbitrary unmodeled side effects.
Definition: Expr.h:599
ValueDecl * getDecl()
Definition: Expr.h:1147
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1395
The result type of a method or function.
bool isTrivial() const
Whether this function is "trivial" in some specialized C++ senses.
Definition: Decl.h:2025
CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style cast in C++ (C++ [expr.cast]), which uses the syntax (Type)expr.
Definition: Expr.h:3255
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:704
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:413
reverse_iterator rend()
Definition: ASTVector.h:105
do v
Definition: arm_acle.h:64
const SourceManager & SM
Definition: Format.cpp:1568
__UINTPTR_TYPE__ uintptr_t
An unsigned integer type with the property that any valid pointer to void can be converted to this ty...
Definition: opencl-c.h:89
SourceRange getSourceRange() const
Definition: ExprCXX.h:140
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:276
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:414
unsigned getBuiltinCallee() const
getBuiltinCallee - If this is a call to a builtin, return the builtin ID of the callee.
Definition: Expr.cpp:1369
unsigned getWCharWidth() const
getWCharWidth/Align - Return the size of &#39;wchar_t&#39; for this target, in bits.
Definition: TargetInfo.h:556
RecordDecl * getDecl() const
Definition: Type.h:4392
SourceLocation getOperatorLoc() const
Returns the location of the operator symbol in the expression.
Definition: ExprCXX.h:128
Expr * IgnoreCasts() LLVM_READONLY
Skip past any casts which might surround this expression until reaching a fixed point.
Definition: Expr.cpp:2711
static Opcode getOverloadedOpcode(OverloadedOperatorKind OO)
Retrieve the binary opcode that corresponds to the given overloaded operator.
Definition: Expr.cpp:1900
const llvm::fltSemantics & getSemantics() const
Return the APFloat semantics this literal uses.
Definition: Expr.cpp:857
Expr * IgnoreConversionOperator() LLVM_READONLY
Skip conversion operators.
Definition: Expr.cpp:2732
AtomicExpr(SourceLocation BLoc, ArrayRef< Expr *> args, QualType t, AtomicOp op, SourceLocation RP)
Definition: Expr.cpp:4203
unsigned DotLoc
The location of the &#39;.&#39; in the designated initializer.
Definition: Expr.h:4502
UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, QualType resultType, SourceLocation op, SourceLocation rp)
Definition: Expr.h:2268
A C++ dynamic_cast expression (C++ [expr.dynamic.cast]).
Definition: ExprCXX.h:361
void ExpandDesignator(const ASTContext &C, unsigned Idx, const Designator *First, const Designator *Last)
Replaces the designator at index Idx with the series of designators in [First, Last).
Definition: Expr.cpp:4016
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:978
Expr * getBase() const
Definition: Expr.h:4802
ParenListExprBitfields ParenListExprBits
Definition: Stmt.h:935
static StringRef getIdentKindName(IdentKind IK)
Definition: Expr.cpp:512
#define false
Definition: stdbool.h:17
Kind
QualType getCanonicalType() const
Definition: Type.h:6123
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5511
bool isInstantiationDependent() const
Whether this expression is instantiation-dependent, meaning that it depends in some way on a template...
Definition: Expr.h:193
SourceLocation getRAngleLoc() const
Retrieve the location of the right angle bracket ending the explicit template argument list following...
Definition: Expr.h:1216
NullPointerConstantKind isNullPointerConstant(ASTContext &Ctx, NullPointerConstantValueDependence NPC) const
isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to a Null pointer constant...
Definition: Expr.cpp:3433
Encodes a location in the source.
QualType getReturnType() const
Definition: Type.h:3625
SourceLocation getOperatorLoc() const
Definition: Expr.h:3350
PseudoObjectExprBitfields PseudoObjectExprBits
Definition: Stmt.h:937
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:6200
Expression is not a Null pointer constant.
Definition: Expr.h:696
Expr * getSubExpr() const
Definition: Expr.h:1964
CastKind getCastKind() const
Definition: Expr.h:3087
static const FieldDecl * getTargetFieldForToUnionCast(QualType unionType, QualType opType)
Definition: Expr.cpp:1827
A call to a literal operator (C++11 [over.literal]) written as a user-defined literal (C++11 [lit...
Definition: ExprCXX.h:480
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3063
ObjCMethodFamily getMethodFamily() const
Definition: ExprObjC.h:1375
unsigned getChar16Width() const
getChar16Width/Align - Return the size of &#39;char16_t&#39; for this target, in bits.
Definition: TargetInfo.h:561
Represents a call to a member function that may be written either with member call syntax (e...
Definition: ExprCXX.h:170
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:375
llvm::iterator_range< capture_init_iterator > capture_inits()
Retrieve the initialization expressions for this lambda&#39;s captures.
Definition: ExprCXX.h:1849
static StringLiteral * CreateEmpty(const ASTContext &Ctx, unsigned NumConcatenated, unsigned Length, unsigned CharByteWidth)
Construct an empty string literal.
Definition: Expr.cpp:993
GenericSelectionExprBitfields GenericSelectionExprBits
Definition: Stmt.h:936
static QualType getUnderlyingType(const SubRegion *R)
Expr * getInClassInitializer() const
Get the C++11 default member initializer for this member, or null if one has not been set...
Definition: Decl.h:2720
void FixedPointValueToString(SmallVectorImpl< char > &Str, llvm::APSInt Val, unsigned Scale)
Definition: Type.cpp:4096
ExprObjectKind
A further classification of the kind of object referenced by an l-value or x-value.
Definition: Specifiers.h:123
static OffsetOfExpr * Create(const ASTContext &C, QualType type, SourceLocation OperatorLoc, TypeSourceInfo *tsi, ArrayRef< OffsetOfNode > comps, ArrayRef< Expr *> exprs, SourceLocation RParenLoc)
Definition: Expr.cpp:1448
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1781
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2048
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2426
std::string getValueAsString(unsigned Radix) const
Definition: Expr.cpp:821
static std::string ComputeName(IdentKind IK, const Decl *CurrentDecl)
Definition: Expr.cpp:536
const ParmVarDecl * getParamDecl(unsigned i) const
Definition: Decl.h:2284
Specifies that a value-dependent expression should be considered to never be a null pointer constant...
Definition: Expr.h:727
CanQualType VoidTy
Definition: ASTContext.h:1015
Expr * updateInit(const ASTContext &C, unsigned Init, Expr *expr)
Updates the initializer at index Init with the new expression expr, and returns the old expression at...
Definition: Expr.cpp:2026
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Expr.cpp:1438
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:151
AccessSpecifier getAccess() const
bool isKnownToHaveBooleanValue() const
isKnownToHaveBooleanValue - Return true if this is an integer expression that is known to return 0 or...
Definition: Expr.cpp:133
RefQualifierKind
The kind of C++11 ref-qualifier associated with a function type.
Definition: Type.h:1365
ImplicitCastExpr - Allows us to explicitly represent implicit type conversions, which have no direct ...
Definition: Expr.h:3158
static QualType findBoundMemberType(const Expr *expr)
Given an expression of bound-member type, find the type of the member.
Definition: Expr.cpp:2539
Expr ** getInits()
Retrieve the set of initializers.
Definition: Expr.h:4252
bool refersToVectorElement() const
Returns whether this expression refers to a vector element.
Definition: Expr.cpp:3637
static DesignatedInitExpr * CreateEmpty(const ASTContext &C, unsigned NumIndexExprs)
Definition: Expr.cpp:3954
Used for C&#39;s _Alignof and C++&#39;s alignof.
Definition: TypeTraits.h:100
const CXXRecordDecl * getBestDynamicClassType() const
For an expression of class type or pointer to class type, return the most derived class decl the expr...
Definition: Expr.cpp:61
Expr * getArrayRangeStart(const Designator &D) const
Definition: Expr.cpp:4002
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1356
bool isVectorType() const
Definition: Type.h:6393
__DEVICE__ void * memcpy(void *__a, const void *__b, size_t __c)
An rvalue ref-qualifier was provided (&&).
Definition: Type.h:1373
unsigned LBracketLoc
The location of the &#39;[&#39; starting the array range designator.
Definition: Expr.h:4514
MemberExprBitfields MemberExprBits
Definition: Stmt.h:931
Expr * getArrayFiller()
If this initializer list initializes an array with more elements than there are initializers in the l...
Definition: Expr.h:4313
LLVM_READONLY bool isPrintable(unsigned char c)
Return true if this character is an ASCII printable character; that is, a character that should take ...
Definition: CharInfo.h:139
void sawArrayRangeDesignator(bool ARD=true)
Definition: Expr.h:4390
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2306
bool isInstantiationDependentType() const
Determine whether this type is an instantiation-dependent type, meaning that the type involves a temp...
Definition: Type.h:2094
static MemberExpr * Create(const ASTContext &C, Expr *base, bool isarrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *memberdecl, DeclAccessPair founddecl, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *targs, QualType ty, ExprValueKind VK, ExprObjectKind OK)
Definition: Expr.cpp:1540
A placeholder type used to construct an empty shell of a type, that will be filled in later (e...
Definition: Stmt.h:994
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:214
Expr * getLHS() const
Definition: Expr.h:3358
A POD class for pairing a NamedDecl* with an access specifier.
DeclarationNameLoc - Additional source/type location info for a declaration name. ...
void * Allocate(size_t Size, unsigned Align=8) const
Definition: ASTContext.h:668
Represents a C11 generic selection.
Definition: Expr.h:5044
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Expr.cpp:2114
SourceRange getDesignatorsSourceRange() const
Definition: Expr.cpp:3970
StreamedQualTypeHelper stream(const PrintingPolicy &Policy, const Twine &PlaceHolder=Twine(), unsigned Indentation=0) const
Definition: Type.h:1028
Dataflow Directional Tag Classes.
static GenericSelectionExpr * CreateEmpty(const ASTContext &Context, unsigned NumAssocs)
Create an empty generic selection expression for deserialization.
Definition: Expr.cpp:3856
NestedNameSpecifier * getNestedNameSpecifier() const
Retrieve the nested-name-specifier to which this instance refers.
bool isValid() const
Return true if this is a valid SourceLocation object.
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:2096
[C99 6.4.2.2] - A predefined identifier such as func.
Definition: Expr.h:1791
UnaryOperatorKind
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1266
static Expr * IgnoreParensSingleStep(Expr *E)
Definition: Expr.cpp:2640
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:573
bool hasSideEffects(Expr *E, ASTContext &Ctx)
Definition: Transforms.cpp:167
OverloadedOperatorKind getOperator() const
Returns the kind of overloaded operator that this expression refers to.
Definition: ExprCXX.h:106
static Expr * IgnoreBaseCastsSingleStep(Expr *E)
Definition: Expr.cpp:2616
OverloadedOperatorKind
Enumeration specifying the different kinds of C++ overloaded operators.
Definition: OperatorKinds.h:21
Decl * getReferencedDeclOfCallee()
Definition: Expr.cpp:1341
A field designator, e.g., ".x".
Definition: Expr.h:4492
void setExprs(const ASTContext &C, ArrayRef< Expr *> Exprs)
Definition: Expr.cpp:3765
bool isDependent() const
Whether this nested name specifier refers to a dependent type or not.
AccessSpecifier getAccess() const
Definition: DeclBase.h:465
static GenericSelectionExpr * Create(const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr, ArrayRef< TypeSourceInfo *> AssocTypes, ArrayRef< Expr *> AssocExprs, SourceLocation DefaultLoc, SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
Create a non-result-dependent generic selection expression.
Definition: Expr.cpp:3827
FunctionDecl * getTemplateInstantiationPattern() const
Retrieve the function declaration from which this function could be instantiated, if it is an instant...
Definition: Decl.cpp:3431
StmtClass getStmtClass() const
Definition: Stmt.h:1041
const char * getCastKindName() const
Definition: Expr.h:3091
const CXXRecordDecl * getParent() const
Returns the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2173
bool isBooleanType() const
Definition: Type.h:6677
Expression is a Null pointer constant built from a zero integer expression that is not a simple...
Definition: Expr.h:703
void resize(const ASTContext &C, unsigned N, const T &NV)
Definition: ASTVector.h:341
static PseudoObjectExpr * Create(const ASTContext &Context, Expr *syntactic, ArrayRef< Expr *> semantic, unsigned resultIndex)
Definition: Expr.cpp:4127
void setInstantiationDependent(bool ID)
Set whether this expression is instantiation-dependent or not.
Definition: Expr.h:198
const T * const_iterator
Definition: ASTVector.h:86
Expression is a C++11 nullptr.
Definition: Expr.h:709
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2768
bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx, SourceLocation *Loc=nullptr, bool isEvaluated=true) const
isIntegerConstantExpr - Return true if this expression is a valid integer constant expression...
unsigned getNumElements() const
getNumElements - Get the number of components being selected.
Definition: Expr.cpp:3681
semantics_iterator semantics_begin()
Definition: Expr.h:5579
QualType getCallReturnType(const ASTContext &Ctx) const
getCallReturnType - Get the return type of the call expr.
Definition: Expr.cpp:1397
ConstEvaluatedExprVisitor - This class visits &#39;const Expr *&#39;s.
ExplicitCastExpr - An explicit cast written in the source code.
Definition: Expr.h:3221
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
specific_decl_iterator - Iterates over a subrange of declarations stored in a DeclContext, providing only those that are of type SpecificDecl (or a class derived from it).
Definition: DeclBase.h:2030
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:2723
Expr * getArrayRangeEnd(const Designator &D) const
Definition: Expr.cpp:4008
llvm::APInt getValue() const
Definition: Expr.h:1325
unsigned getNumSubExprs() const
Definition: Expr.h:5710
Pointer to a block type.
Definition: Type.h:2651
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:4052
bool isStringLiteralInit() const
Definition: Expr.cpp:2048
struct ArrayOrRangeDesignator ArrayOrRange
An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
Definition: Expr.h:4540
unsigned getIntWidth(QualType T) const
Expr * IgnoreImplicit() LLVM_READONLY
Skip past any implicit AST nodes which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2715
Not an overloaded operator.
Definition: OperatorKinds.h:22
bool isIncompleteArrayType() const
Definition: Type.h:6365
DeclarationNameInfo getNameInfo() const
Definition: Expr.h:1151
bool HasSideEffects
Whether the evaluated expression has side effects.
Definition: Expr.h:546
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4382
Location wrapper for a TemplateArgument.
Definition: TemplateBase.h:449
bool empty() const
Definition: Type.h:415
bool body_empty() const
Definition: Stmt.h:1292
ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
Definition: Expr.h:2350
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6594
bool isConstantInitializer(ASTContext &Ctx, bool ForRef, const Expr **Culprit=nullptr) const
isConstantInitializer - Returns true if this expression can be emitted to IR as a constant...
Definition: Expr.cpp:2889
T * getAttr() const
Definition: DeclBase.h:530
static CStyleCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind K, Expr *Op, const CXXCastPath *BasePath, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation R)
Definition: Expr.cpp:1868
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Expr.cpp:4056
CanQualType DependentTy
Definition: ASTContext.h:1044
Represents a call to a CUDA kernel function.
Definition: ExprCXX.h:218
bool isFunctionType() const
Definition: Type.h:6304
static ImplicitCastExpr * CreateEmpty(const ASTContext &Context, unsigned PathSize)
Definition: Expr.cpp:1861
Expr * IgnoreParenLValueCasts() LLVM_READONLY
Skip past any parentheses and lvalue casts which might surround this expression until reaching a fixe...
Definition: Expr.cpp:2740
Opcode getOpcode() const
Definition: Expr.h:1959
Expr * getArg(unsigned Arg)
Return the specified argument.
Definition: ExprCXX.h:1470
NamedDecl * getConversionFunction() const
If this cast applies a user-defined conversion, retrieve the conversion function that it invokes...
Definition: Expr.cpp:1796
UnaryExprOrTypeTraitExprBitfields UnaryExprOrTypeTraitExprBits
Definition: Stmt.h:928
Represents a base class of a C++ class.
Definition: DeclCXX.h:191
iterator begin()
Definition: ASTVector.h:97
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2072
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:546
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2266
llvm::iterator_range< specific_attr_iterator< T > > specific_attrs() const
Definition: DeclBase.h:516
A use of a default initializer in a constructor or in aggregate initialization.
Definition: ExprCXX.h:1186
A template argument list.
Definition: DeclTemplate.h:209
static CStyleCastExpr * CreateEmpty(const ASTContext &Context, unsigned PathSize)
Definition: Expr.cpp:1883
static const Expr * skipTemporaryBindingsNoOpCastsAndParens(const Expr *E)
Skip over any no-op casts and any temporary-binding expressions.
Definition: Expr.cpp:2769
bool refersToGlobalRegisterVar() const
Returns whether this expression refers to a global register variable.
Definition: Expr.cpp:3663
bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, SourceRange &R1, SourceRange &R2, ASTContext &Ctx) const
isUnusedResultAWarning - Return true if this immediate expression should be warned about if the resul...
Definition: Expr.cpp:2159
void reserve(const ASTContext &C, unsigned N)
Definition: ASTVector.h:173
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
Expression is a Null pointer constant built from a literal zero.
Definition: Expr.h:706
void Deallocate(void *Ptr) const
Definition: ASTContext.h:674
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:2725
CallingConv getCallConv() const
Definition: Type.h:3635
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
bool isVoidType() const
Definition: Type.h:6560
bool isSyntacticForm() const
Definition: Expr.h:4373
TypeInfo getTypeInfo(const Type *T) const
Get the size and alignment of the specified complete type in bits.
static QualType getBaseOriginalType(const Expr *Base)
Return original type of the base expression for array section.
Definition: Expr.cpp:4292
ChooseExpr - GNU builtin-in function __builtin_choose_expr.
Definition: Expr.h:4011
static bool hasAnyTypeDependentArguments(ArrayRef< Expr *> Exprs)
hasAnyTypeDependentArguments - Determines if any of the expressions in Exprs is type-dependent.
Definition: Expr.cpp:2881
Represents an explicit C++ type conversion that uses "functional" notation (C++ [expr.type.conv]).
Definition: ExprCXX.h:1585
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6111
Expr * getRHS() const
Definition: Expr.h:3662
bool hasUnusedResultAttr(const ASTContext &Ctx) const
Returns true if this call expression should warn on unused results.
Definition: Expr.h:2674
bool isPRValue() const
Definition: Expr.h:357