clang  8.0.0svn
CGClass.cpp
Go to the documentation of this file.
1 //===--- CGClass.cpp - Emit LLVM Code for C++ classes -----------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This contains code dealing with C++ code generation of classes
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CGBlocks.h"
15 #include "CGCXXABI.h"
16 #include "CGDebugInfo.h"
17 #include "CGRecordLayout.h"
18 #include "CodeGenFunction.h"
20 #include "clang/AST/DeclTemplate.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "clang/AST/StmtCXX.h"
27 #include "llvm/IR/Intrinsics.h"
28 #include "llvm/IR/Metadata.h"
29 #include "llvm/Transforms/Utils/SanitizerStats.h"
30 
31 using namespace clang;
32 using namespace CodeGen;
33 
34 /// Return the best known alignment for an unknown pointer to a
35 /// particular class.
37  if (!RD->isCompleteDefinition())
38  return CharUnits::One(); // Hopefully won't be used anywhere.
39 
40  auto &layout = getContext().getASTRecordLayout(RD);
41 
42  // If the class is final, then we know that the pointer points to an
43  // object of that type and can use the full alignment.
44  if (RD->hasAttr<FinalAttr>()) {
45  return layout.getAlignment();
46 
47  // Otherwise, we have to assume it could be a subclass.
48  } else {
49  return layout.getNonVirtualAlignment();
50  }
51 }
52 
53 /// Return the best known alignment for a pointer to a virtual base,
54 /// given the alignment of a pointer to the derived class.
56  const CXXRecordDecl *derivedClass,
57  const CXXRecordDecl *vbaseClass) {
58  // The basic idea here is that an underaligned derived pointer might
59  // indicate an underaligned base pointer.
60 
61  assert(vbaseClass->isCompleteDefinition());
62  auto &baseLayout = getContext().getASTRecordLayout(vbaseClass);
63  CharUnits expectedVBaseAlign = baseLayout.getNonVirtualAlignment();
64 
65  return getDynamicOffsetAlignment(actualDerivedAlign, derivedClass,
66  expectedVBaseAlign);
67 }
68 
71  const CXXRecordDecl *baseDecl,
72  CharUnits expectedTargetAlign) {
73  // If the base is an incomplete type (which is, alas, possible with
74  // member pointers), be pessimistic.
75  if (!baseDecl->isCompleteDefinition())
76  return std::min(actualBaseAlign, expectedTargetAlign);
77 
78  auto &baseLayout = getContext().getASTRecordLayout(baseDecl);
79  CharUnits expectedBaseAlign = baseLayout.getNonVirtualAlignment();
80 
81  // If the class is properly aligned, assume the target offset is, too.
82  //
83  // This actually isn't necessarily the right thing to do --- if the
84  // class is a complete object, but it's only properly aligned for a
85  // base subobject, then the alignments of things relative to it are
86  // probably off as well. (Note that this requires the alignment of
87  // the target to be greater than the NV alignment of the derived
88  // class.)
89  //
90  // However, our approach to this kind of under-alignment can only
91  // ever be best effort; after all, we're never going to propagate
92  // alignments through variables or parameters. Note, in particular,
93  // that constructing a polymorphic type in an address that's less
94  // than pointer-aligned will generally trap in the constructor,
95  // unless we someday add some sort of attribute to change the
96  // assumed alignment of 'this'. So our goal here is pretty much
97  // just to allow the user to explicitly say that a pointer is
98  // under-aligned and then safely access its fields and vtables.
99  if (actualBaseAlign >= expectedBaseAlign) {
100  return expectedTargetAlign;
101  }
102 
103  // Otherwise, we might be offset by an arbitrary multiple of the
104  // actual alignment. The correct adjustment is to take the min of
105  // the two alignments.
106  return std::min(actualBaseAlign, expectedTargetAlign);
107 }
108 
110  assert(CurFuncDecl && "loading 'this' without a func declaration?");
111  assert(isa<CXXMethodDecl>(CurFuncDecl));
112 
113  // Lazily compute CXXThisAlignment.
114  if (CXXThisAlignment.isZero()) {
115  // Just use the best known alignment for the parent.
116  // TODO: if we're currently emitting a complete-object ctor/dtor,
117  // we can always use the complete-object alignment.
118  auto RD = cast<CXXMethodDecl>(CurFuncDecl)->getParent();
119  CXXThisAlignment = CGM.getClassPointerAlignment(RD);
120  }
121 
122  return Address(LoadCXXThis(), CXXThisAlignment);
123 }
124 
125 /// Emit the address of a field using a member data pointer.
126 ///
127 /// \param E Only used for emergency diagnostics
128 Address
130  llvm::Value *memberPtr,
131  const MemberPointerType *memberPtrType,
132  LValueBaseInfo *BaseInfo,
133  TBAAAccessInfo *TBAAInfo) {
134  // Ask the ABI to compute the actual address.
135  llvm::Value *ptr =
136  CGM.getCXXABI().EmitMemberDataPointerAddress(*this, E, base,
137  memberPtr, memberPtrType);
138 
139  QualType memberType = memberPtrType->getPointeeType();
140  CharUnits memberAlign = getNaturalTypeAlignment(memberType, BaseInfo,
141  TBAAInfo);
142  memberAlign =
143  CGM.getDynamicOffsetAlignment(base.getAlignment(),
144  memberPtrType->getClass()->getAsCXXRecordDecl(),
145  memberAlign);
146  return Address(ptr, memberAlign);
147 }
148 
150  const CXXRecordDecl *DerivedClass, CastExpr::path_const_iterator Start,
153 
154  const ASTContext &Context = getContext();
155  const CXXRecordDecl *RD = DerivedClass;
156 
157  for (CastExpr::path_const_iterator I = Start; I != End; ++I) {
158  const CXXBaseSpecifier *Base = *I;
159  assert(!Base->isVirtual() && "Should not see virtual bases here!");
160 
161  // Get the layout.
162  const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
163 
164  const CXXRecordDecl *BaseDecl =
165  cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
166 
167  // Add the offset.
168  Offset += Layout.getBaseClassOffset(BaseDecl);
169 
170  RD = BaseDecl;
171  }
172 
173  return Offset;
174 }
175 
176 llvm::Constant *
180  assert(PathBegin != PathEnd && "Base path should not be empty!");
181 
182  CharUnits Offset =
183  computeNonVirtualBaseClassOffset(ClassDecl, PathBegin, PathEnd);
184  if (Offset.isZero())
185  return nullptr;
186 
188  Types.ConvertType(getContext().getPointerDiffType());
189 
190  return llvm::ConstantInt::get(PtrDiffTy, Offset.getQuantity());
191 }
192 
193 /// Gets the address of a direct base class within a complete object.
194 /// This should only be used for (1) non-virtual bases or (2) virtual bases
195 /// when the type is known to be complete (e.g. in complete destructors).
196 ///
197 /// The object pointed to by 'This' is assumed to be non-null.
198 Address
200  const CXXRecordDecl *Derived,
201  const CXXRecordDecl *Base,
202  bool BaseIsVirtual) {
203  // 'this' must be a pointer (in some address space) to Derived.
204  assert(This.getElementType() == ConvertType(Derived));
205 
206  // Compute the offset of the virtual base.
208  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(Derived);
209  if (BaseIsVirtual)
210  Offset = Layout.getVBaseClassOffset(Base);
211  else
212  Offset = Layout.getBaseClassOffset(Base);
213 
214  // Shift and cast down to the base type.
215  // TODO: for complete types, this should be possible with a GEP.
216  Address V = This;
217  if (!Offset.isZero()) {
218  V = Builder.CreateElementBitCast(V, Int8Ty);
219  V = Builder.CreateConstInBoundsByteGEP(V, Offset);
220  }
221  V = Builder.CreateElementBitCast(V, ConvertType(Base));
222 
223  return V;
224 }
225 
226 static Address
228  CharUnits nonVirtualOffset,
229  llvm::Value *virtualOffset,
230  const CXXRecordDecl *derivedClass,
231  const CXXRecordDecl *nearestVBase) {
232  // Assert that we have something to do.
233  assert(!nonVirtualOffset.isZero() || virtualOffset != nullptr);
234 
235  // Compute the offset from the static and dynamic components.
236  llvm::Value *baseOffset;
237  if (!nonVirtualOffset.isZero()) {
238  baseOffset = llvm::ConstantInt::get(CGF.PtrDiffTy,
239  nonVirtualOffset.getQuantity());
240  if (virtualOffset) {
241  baseOffset = CGF.Builder.CreateAdd(virtualOffset, baseOffset);
242  }
243  } else {
244  baseOffset = virtualOffset;
245  }
246 
247  // Apply the base offset.
248  llvm::Value *ptr = addr.getPointer();
249  ptr = CGF.Builder.CreateBitCast(ptr, CGF.Int8PtrTy);
250  ptr = CGF.Builder.CreateInBoundsGEP(ptr, baseOffset, "add.ptr");
251 
252  // If we have a virtual component, the alignment of the result will
253  // be relative only to the known alignment of that vbase.
254  CharUnits alignment;
255  if (virtualOffset) {
256  assert(nearestVBase && "virtual offset without vbase?");
257  alignment = CGF.CGM.getVBaseAlignment(addr.getAlignment(),
258  derivedClass, nearestVBase);
259  } else {
260  alignment = addr.getAlignment();
261  }
262  alignment = alignment.alignmentAtOffset(nonVirtualOffset);
263 
264  return Address(ptr, alignment);
265 }
266 
268  Address Value, const CXXRecordDecl *Derived,
270  CastExpr::path_const_iterator PathEnd, bool NullCheckValue,
271  SourceLocation Loc) {
272  assert(PathBegin != PathEnd && "Base path should not be empty!");
273 
274  CastExpr::path_const_iterator Start = PathBegin;
275  const CXXRecordDecl *VBase = nullptr;
276 
277  // Sema has done some convenient canonicalization here: if the
278  // access path involved any virtual steps, the conversion path will
279  // *start* with a step down to the correct virtual base subobject,
280  // and hence will not require any further steps.
281  if ((*Start)->isVirtual()) {
282  VBase =
283  cast<CXXRecordDecl>((*Start)->getType()->getAs<RecordType>()->getDecl());
284  ++Start;
285  }
286 
287  // Compute the static offset of the ultimate destination within its
288  // allocating subobject (the virtual base, if there is one, or else
289  // the "complete" object that we see).
290  CharUnits NonVirtualOffset = CGM.computeNonVirtualBaseClassOffset(
291  VBase ? VBase : Derived, Start, PathEnd);
292 
293  // If there's a virtual step, we can sometimes "devirtualize" it.
294  // For now, that's limited to when the derived type is final.
295  // TODO: "devirtualize" this for accesses to known-complete objects.
296  if (VBase && Derived->hasAttr<FinalAttr>()) {
297  const ASTRecordLayout &layout = getContext().getASTRecordLayout(Derived);
298  CharUnits vBaseOffset = layout.getVBaseClassOffset(VBase);
299  NonVirtualOffset += vBaseOffset;
300  VBase = nullptr; // we no longer have a virtual step
301  }
302 
303  // Get the base pointer type.
304  llvm::Type *BasePtrTy =
305  ConvertType((PathEnd[-1])->getType())->getPointerTo();
306 
307  QualType DerivedTy = getContext().getRecordType(Derived);
308  CharUnits DerivedAlign = CGM.getClassPointerAlignment(Derived);
309 
310  // If the static offset is zero and we don't have a virtual step,
311  // just do a bitcast; null checks are unnecessary.
312  if (NonVirtualOffset.isZero() && !VBase) {
313  if (sanitizePerformTypeCheck()) {
314  SanitizerSet SkippedChecks;
315  SkippedChecks.set(SanitizerKind::Null, !NullCheckValue);
316  EmitTypeCheck(TCK_Upcast, Loc, Value.getPointer(),
317  DerivedTy, DerivedAlign, SkippedChecks);
318  }
319  return Builder.CreateBitCast(Value, BasePtrTy);
320  }
321 
322  llvm::BasicBlock *origBB = nullptr;
323  llvm::BasicBlock *endBB = nullptr;
324 
325  // Skip over the offset (and the vtable load) if we're supposed to
326  // null-check the pointer.
327  if (NullCheckValue) {
328  origBB = Builder.GetInsertBlock();
329  llvm::BasicBlock *notNullBB = createBasicBlock("cast.notnull");
330  endBB = createBasicBlock("cast.end");
331 
332  llvm::Value *isNull = Builder.CreateIsNull(Value.getPointer());
333  Builder.CreateCondBr(isNull, endBB, notNullBB);
334  EmitBlock(notNullBB);
335  }
336 
337  if (sanitizePerformTypeCheck()) {
338  SanitizerSet SkippedChecks;
339  SkippedChecks.set(SanitizerKind::Null, true);
340  EmitTypeCheck(VBase ? TCK_UpcastToVirtualBase : TCK_Upcast, Loc,
341  Value.getPointer(), DerivedTy, DerivedAlign, SkippedChecks);
342  }
343 
344  // Compute the virtual offset.
345  llvm::Value *VirtualOffset = nullptr;
346  if (VBase) {
347  VirtualOffset =
348  CGM.getCXXABI().GetVirtualBaseClassOffset(*this, Value, Derived, VBase);
349  }
350 
351  // Apply both offsets.
352  Value = ApplyNonVirtualAndVirtualOffset(*this, Value, NonVirtualOffset,
353  VirtualOffset, Derived, VBase);
354 
355  // Cast to the destination type.
356  Value = Builder.CreateBitCast(Value, BasePtrTy);
357 
358  // Build a phi if we needed a null check.
359  if (NullCheckValue) {
360  llvm::BasicBlock *notNullBB = Builder.GetInsertBlock();
361  Builder.CreateBr(endBB);
362  EmitBlock(endBB);
363 
364  llvm::PHINode *PHI = Builder.CreatePHI(BasePtrTy, 2, "cast.result");
365  PHI->addIncoming(Value.getPointer(), notNullBB);
366  PHI->addIncoming(llvm::Constant::getNullValue(BasePtrTy), origBB);
367  Value = Address(PHI, Value.getAlignment());
368  }
369 
370  return Value;
371 }
372 
373 Address
375  const CXXRecordDecl *Derived,
378  bool NullCheckValue) {
379  assert(PathBegin != PathEnd && "Base path should not be empty!");
380 
381  QualType DerivedTy =
382  getContext().getCanonicalType(getContext().getTagDeclType(Derived));
383  llvm::Type *DerivedPtrTy = ConvertType(DerivedTy)->getPointerTo();
384 
385  llvm::Value *NonVirtualOffset =
386  CGM.GetNonVirtualBaseClassOffset(Derived, PathBegin, PathEnd);
387 
388  if (!NonVirtualOffset) {
389  // No offset, we can just cast back.
390  return Builder.CreateBitCast(BaseAddr, DerivedPtrTy);
391  }
392 
393  llvm::BasicBlock *CastNull = nullptr;
394  llvm::BasicBlock *CastNotNull = nullptr;
395  llvm::BasicBlock *CastEnd = nullptr;
396 
397  if (NullCheckValue) {
398  CastNull = createBasicBlock("cast.null");
399  CastNotNull = createBasicBlock("cast.notnull");
400  CastEnd = createBasicBlock("cast.end");
401 
402  llvm::Value *IsNull = Builder.CreateIsNull(BaseAddr.getPointer());
403  Builder.CreateCondBr(IsNull, CastNull, CastNotNull);
404  EmitBlock(CastNotNull);
405  }
406 
407  // Apply the offset.
408  llvm::Value *Value = Builder.CreateBitCast(BaseAddr.getPointer(), Int8PtrTy);
409  Value = Builder.CreateInBoundsGEP(Value, Builder.CreateNeg(NonVirtualOffset),
410  "sub.ptr");
411 
412  // Just cast.
413  Value = Builder.CreateBitCast(Value, DerivedPtrTy);
414 
415  // Produce a PHI if we had a null-check.
416  if (NullCheckValue) {
417  Builder.CreateBr(CastEnd);
418  EmitBlock(CastNull);
419  Builder.CreateBr(CastEnd);
420  EmitBlock(CastEnd);
421 
422  llvm::PHINode *PHI = Builder.CreatePHI(Value->getType(), 2);
423  PHI->addIncoming(Value, CastNotNull);
424  PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()), CastNull);
425  Value = PHI;
426  }
427 
428  return Address(Value, CGM.getClassPointerAlignment(Derived));
429 }
430 
432  bool ForVirtualBase,
433  bool Delegating) {
434  if (!CGM.getCXXABI().NeedsVTTParameter(GD)) {
435  // This constructor/destructor does not need a VTT parameter.
436  return nullptr;
437  }
438 
439  const CXXRecordDecl *RD = cast<CXXMethodDecl>(CurCodeDecl)->getParent();
440  const CXXRecordDecl *Base = cast<CXXMethodDecl>(GD.getDecl())->getParent();
441 
442  llvm::Value *VTT;
443 
444  uint64_t SubVTTIndex;
445 
446  if (Delegating) {
447  // If this is a delegating constructor call, just load the VTT.
448  return LoadCXXVTT();
449  } else if (RD == Base) {
450  // If the record matches the base, this is the complete ctor/dtor
451  // variant calling the base variant in a class with virtual bases.
452  assert(!CGM.getCXXABI().NeedsVTTParameter(CurGD) &&
453  "doing no-op VTT offset in base dtor/ctor?");
454  assert(!ForVirtualBase && "Can't have same class as virtual base!");
455  SubVTTIndex = 0;
456  } else {
457  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
458  CharUnits BaseOffset = ForVirtualBase ?
459  Layout.getVBaseClassOffset(Base) :
460  Layout.getBaseClassOffset(Base);
461 
462  SubVTTIndex =
463  CGM.getVTables().getSubVTTIndex(RD, BaseSubobject(Base, BaseOffset));
464  assert(SubVTTIndex != 0 && "Sub-VTT index must be greater than zero!");
465  }
466 
467  if (CGM.getCXXABI().NeedsVTTParameter(CurGD)) {
468  // A VTT parameter was passed to the constructor, use it.
469  VTT = LoadCXXVTT();
470  VTT = Builder.CreateConstInBoundsGEP1_64(VTT, SubVTTIndex);
471  } else {
472  // We're the complete constructor, so get the VTT by name.
473  VTT = CGM.getVTables().GetAddrOfVTT(RD);
474  VTT = Builder.CreateConstInBoundsGEP2_64(VTT, 0, SubVTTIndex);
475  }
476 
477  return VTT;
478 }
479 
480 namespace {
481  /// Call the destructor for a direct base class.
482  struct CallBaseDtor final : EHScopeStack::Cleanup {
483  const CXXRecordDecl *BaseClass;
484  bool BaseIsVirtual;
485  CallBaseDtor(const CXXRecordDecl *Base, bool BaseIsVirtual)
486  : BaseClass(Base), BaseIsVirtual(BaseIsVirtual) {}
487 
488  void Emit(CodeGenFunction &CGF, Flags flags) override {
489  const CXXRecordDecl *DerivedClass =
490  cast<CXXMethodDecl>(CGF.CurCodeDecl)->getParent();
491 
492  const CXXDestructorDecl *D = BaseClass->getDestructor();
493  Address Addr =
495  DerivedClass, BaseClass,
496  BaseIsVirtual);
497  CGF.EmitCXXDestructorCall(D, Dtor_Base, BaseIsVirtual,
498  /*Delegating=*/false, Addr);
499  }
500  };
501 
502  /// A visitor which checks whether an initializer uses 'this' in a
503  /// way which requires the vtable to be properly set.
504  struct DynamicThisUseChecker : ConstEvaluatedExprVisitor<DynamicThisUseChecker> {
506 
507  bool UsesThis;
508 
509  DynamicThisUseChecker(const ASTContext &C) : super(C), UsesThis(false) {}
510 
511  // Black-list all explicit and implicit references to 'this'.
512  //
513  // Do we need to worry about external references to 'this' derived
514  // from arbitrary code? If so, then anything which runs arbitrary
515  // external code might potentially access the vtable.
516  void VisitCXXThisExpr(const CXXThisExpr *E) { UsesThis = true; }
517  };
518 } // end anonymous namespace
519 
520 static bool BaseInitializerUsesThis(ASTContext &C, const Expr *Init) {
521  DynamicThisUseChecker Checker(C);
522  Checker.Visit(Init);
523  return Checker.UsesThis;
524 }
525 
527  const CXXRecordDecl *ClassDecl,
528  CXXCtorInitializer *BaseInit,
529  CXXCtorType CtorType) {
530  assert(BaseInit->isBaseInitializer() &&
531  "Must have base initializer!");
532 
533  Address ThisPtr = CGF.LoadCXXThisAddress();
534 
535  const Type *BaseType = BaseInit->getBaseClass();
536  CXXRecordDecl *BaseClassDecl =
537  cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl());
538 
539  bool isBaseVirtual = BaseInit->isBaseVirtual();
540 
541  // The base constructor doesn't construct virtual bases.
542  if (CtorType == Ctor_Base && isBaseVirtual)
543  return;
544 
545  // If the initializer for the base (other than the constructor
546  // itself) accesses 'this' in any way, we need to initialize the
547  // vtables.
548  if (BaseInitializerUsesThis(CGF.getContext(), BaseInit->getInit()))
549  CGF.InitializeVTablePointers(ClassDecl);
550 
551  // We can pretend to be a complete class because it only matters for
552  // virtual bases, and we only do virtual bases for complete ctors.
553  Address V =
554  CGF.GetAddressOfDirectBaseInCompleteClass(ThisPtr, ClassDecl,
555  BaseClassDecl,
556  isBaseVirtual);
557  AggValueSlot AggSlot =
559  V, Qualifiers(),
563  CGF.overlapForBaseInit(ClassDecl, BaseClassDecl, isBaseVirtual));
564 
565  CGF.EmitAggExpr(BaseInit->getInit(), AggSlot);
566 
567  if (CGF.CGM.getLangOpts().Exceptions &&
568  !BaseClassDecl->hasTrivialDestructor())
569  CGF.EHStack.pushCleanup<CallBaseDtor>(EHCleanup, BaseClassDecl,
570  isBaseVirtual);
571 }
572 
574  auto *CD = dyn_cast<CXXConstructorDecl>(D);
575  if (!(CD && CD->isCopyOrMoveConstructor()) &&
577  return false;
578 
579  // We can emit a memcpy for a trivial copy or move constructor/assignment.
580  if (D->isTrivial() && !D->getParent()->mayInsertExtraPadding())
581  return true;
582 
583  // We *must* emit a memcpy for a defaulted union copy or move op.
584  if (D->getParent()->isUnion() && D->isDefaulted())
585  return true;
586 
587  return false;
588 }
589 
591  CXXCtorInitializer *MemberInit,
592  LValue &LHS) {
593  FieldDecl *Field = MemberInit->getAnyMember();
594  if (MemberInit->isIndirectMemberInitializer()) {
595  // If we are initializing an anonymous union field, drill down to the field.
596  IndirectFieldDecl *IndirectField = MemberInit->getIndirectMember();
597  for (const auto *I : IndirectField->chain())
598  LHS = CGF.EmitLValueForFieldInitialization(LHS, cast<FieldDecl>(I));
599  } else {
600  LHS = CGF.EmitLValueForFieldInitialization(LHS, Field);
601  }
602 }
603 
605  const CXXRecordDecl *ClassDecl,
606  CXXCtorInitializer *MemberInit,
607  const CXXConstructorDecl *Constructor,
608  FunctionArgList &Args) {
609  ApplyDebugLocation Loc(CGF, MemberInit->getSourceLocation());
610  assert(MemberInit->isAnyMemberInitializer() &&
611  "Must have member initializer!");
612  assert(MemberInit->getInit() && "Must have initializer!");
613 
614  // non-static data member initializers.
615  FieldDecl *Field = MemberInit->getAnyMember();
616  QualType FieldType = Field->getType();
617 
618  llvm::Value *ThisPtr = CGF.LoadCXXThis();
619  QualType RecordTy = CGF.getContext().getTypeDeclType(ClassDecl);
620  LValue LHS;
621 
622  // If a base constructor is being emitted, create an LValue that has the
623  // non-virtual alignment.
624  if (CGF.CurGD.getCtorType() == Ctor_Base)
625  LHS = CGF.MakeNaturalAlignPointeeAddrLValue(ThisPtr, RecordTy);
626  else
627  LHS = CGF.MakeNaturalAlignAddrLValue(ThisPtr, RecordTy);
628 
629  EmitLValueForAnyFieldInitialization(CGF, MemberInit, LHS);
630 
631  // Special case: if we are in a copy or move constructor, and we are copying
632  // an array of PODs or classes with trivial copy constructors, ignore the
633  // AST and perform the copy we know is equivalent.
634  // FIXME: This is hacky at best... if we had a bit more explicit information
635  // in the AST, we could generalize it more easily.
636  const ConstantArrayType *Array
637  = CGF.getContext().getAsConstantArrayType(FieldType);
638  if (Array && Constructor->isDefaulted() &&
639  Constructor->isCopyOrMoveConstructor()) {
640  QualType BaseElementTy = CGF.getContext().getBaseElementType(Array);
641  CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(MemberInit->getInit());
642  if (BaseElementTy.isPODType(CGF.getContext()) ||
644  unsigned SrcArgIndex =
645  CGF.CGM.getCXXABI().getSrcArgforCopyCtor(Constructor, Args);
646  llvm::Value *SrcPtr
647  = CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(Args[SrcArgIndex]));
648  LValue ThisRHSLV = CGF.MakeNaturalAlignAddrLValue(SrcPtr, RecordTy);
649  LValue Src = CGF.EmitLValueForFieldInitialization(ThisRHSLV, Field);
650 
651  // Copy the aggregate.
652  CGF.EmitAggregateCopy(LHS, Src, FieldType, CGF.overlapForFieldInit(Field),
653  LHS.isVolatileQualified());
654  // Ensure that we destroy the objects if an exception is thrown later in
655  // the constructor.
656  QualType::DestructionKind dtorKind = FieldType.isDestructedType();
657  if (CGF.needsEHCleanup(dtorKind))
658  CGF.pushEHDestroy(dtorKind, LHS.getAddress(), FieldType);
659  return;
660  }
661  }
662 
663  CGF.EmitInitializerForField(Field, LHS, MemberInit->getInit());
664 }
665 
667  Expr *Init) {
668  QualType FieldType = Field->getType();
669  switch (getEvaluationKind(FieldType)) {
670  case TEK_Scalar:
671  if (LHS.isSimple()) {
672  EmitExprAsInit(Init, Field, LHS, false);
673  } else {
674  RValue RHS = RValue::get(EmitScalarExpr(Init));
675  EmitStoreThroughLValue(RHS, LHS);
676  }
677  break;
678  case TEK_Complex:
679  EmitComplexExprIntoLValue(Init, LHS, /*isInit*/ true);
680  break;
681  case TEK_Aggregate: {
682  AggValueSlot Slot =
684  LHS,
688  overlapForFieldInit(Field),
690  // Checks are made by the code that calls constructor.
692  EmitAggExpr(Init, Slot);
693  break;
694  }
695  }
696 
697  // Ensure that we destroy this object if an exception is thrown
698  // later in the constructor.
699  QualType::DestructionKind dtorKind = FieldType.isDestructedType();
700  if (needsEHCleanup(dtorKind))
701  pushEHDestroy(dtorKind, LHS.getAddress(), FieldType);
702 }
703 
704 /// Checks whether the given constructor is a valid subject for the
705 /// complete-to-base constructor delegation optimization, i.e.
706 /// emitting the complete constructor as a simple call to the base
707 /// constructor.
709  const CXXConstructorDecl *Ctor) {
710 
711  // Currently we disable the optimization for classes with virtual
712  // bases because (1) the addresses of parameter variables need to be
713  // consistent across all initializers but (2) the delegate function
714  // call necessarily creates a second copy of the parameter variable.
715  //
716  // The limiting example (purely theoretical AFAIK):
717  // struct A { A(int &c) { c++; } };
718  // struct B : virtual A {
719  // B(int count) : A(count) { printf("%d\n", count); }
720  // };
721  // ...although even this example could in principle be emitted as a
722  // delegation since the address of the parameter doesn't escape.
723  if (Ctor->getParent()->getNumVBases()) {
724  // TODO: white-list trivial vbase initializers. This case wouldn't
725  // be subject to the restrictions below.
726 
727  // TODO: white-list cases where:
728  // - there are no non-reference parameters to the constructor
729  // - the initializers don't access any non-reference parameters
730  // - the initializers don't take the address of non-reference
731  // parameters
732  // - etc.
733  // If we ever add any of the above cases, remember that:
734  // - function-try-blocks will always blacklist this optimization
735  // - we need to perform the constructor prologue and cleanup in
736  // EmitConstructorBody.
737 
738  return false;
739  }
740 
741  // We also disable the optimization for variadic functions because
742  // it's impossible to "re-pass" varargs.
743  if (Ctor->getType()->getAs<FunctionProtoType>()->isVariadic())
744  return false;
745 
746  // FIXME: Decide if we can do a delegation of a delegating constructor.
747  if (Ctor->isDelegatingConstructor())
748  return false;
749 
750  return true;
751 }
752 
753 // Emit code in ctor (Prologue==true) or dtor (Prologue==false)
754 // to poison the extra field paddings inserted under
755 // -fsanitize-address-field-padding=1|2.
757  ASTContext &Context = getContext();
758  const CXXRecordDecl *ClassDecl =
759  Prologue ? cast<CXXConstructorDecl>(CurGD.getDecl())->getParent()
760  : cast<CXXDestructorDecl>(CurGD.getDecl())->getParent();
761  if (!ClassDecl->mayInsertExtraPadding()) return;
762 
763  struct SizeAndOffset {
764  uint64_t Size;
765  uint64_t Offset;
766  };
767 
768  unsigned PtrSize = CGM.getDataLayout().getPointerSizeInBits();
769  const ASTRecordLayout &Info = Context.getASTRecordLayout(ClassDecl);
770 
771  // Populate sizes and offsets of fields.
773  for (unsigned i = 0, e = Info.getFieldCount(); i != e; ++i)
774  SSV[i].Offset =
775  Context.toCharUnitsFromBits(Info.getFieldOffset(i)).getQuantity();
776 
777  size_t NumFields = 0;
778  for (const auto *Field : ClassDecl->fields()) {
779  const FieldDecl *D = Field;
780  std::pair<CharUnits, CharUnits> FieldInfo =
781  Context.getTypeInfoInChars(D->getType());
782  CharUnits FieldSize = FieldInfo.first;
783  assert(NumFields < SSV.size());
784  SSV[NumFields].Size = D->isBitField() ? 0 : FieldSize.getQuantity();
785  NumFields++;
786  }
787  assert(NumFields == SSV.size());
788  if (SSV.size() <= 1) return;
789 
790  // We will insert calls to __asan_* run-time functions.
791  // LLVM AddressSanitizer pass may decide to inline them later.
792  llvm::Type *Args[2] = {IntPtrTy, IntPtrTy};
793  llvm::FunctionType *FTy =
794  llvm::FunctionType::get(CGM.VoidTy, Args, false);
795  llvm::Constant *F = CGM.CreateRuntimeFunction(
796  FTy, Prologue ? "__asan_poison_intra_object_redzone"
797  : "__asan_unpoison_intra_object_redzone");
798 
799  llvm::Value *ThisPtr = LoadCXXThis();
800  ThisPtr = Builder.CreatePtrToInt(ThisPtr, IntPtrTy);
801  uint64_t TypeSize = Info.getNonVirtualSize().getQuantity();
802  // For each field check if it has sufficient padding,
803  // if so (un)poison it with a call.
804  for (size_t i = 0; i < SSV.size(); i++) {
805  uint64_t AsanAlignment = 8;
806  uint64_t NextField = i == SSV.size() - 1 ? TypeSize : SSV[i + 1].Offset;
807  uint64_t PoisonSize = NextField - SSV[i].Offset - SSV[i].Size;
808  uint64_t EndOffset = SSV[i].Offset + SSV[i].Size;
809  if (PoisonSize < AsanAlignment || !SSV[i].Size ||
810  (NextField % AsanAlignment) != 0)
811  continue;
812  Builder.CreateCall(
813  F, {Builder.CreateAdd(ThisPtr, Builder.getIntN(PtrSize, EndOffset)),
814  Builder.getIntN(PtrSize, PoisonSize)});
815  }
816 }
817 
818 /// EmitConstructorBody - Emits the body of the current constructor.
820  EmitAsanPrologueOrEpilogue(true);
821  const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(CurGD.getDecl());
822  CXXCtorType CtorType = CurGD.getCtorType();
823 
824  assert((CGM.getTarget().getCXXABI().hasConstructorVariants() ||
825  CtorType == Ctor_Complete) &&
826  "can only generate complete ctor for this ABI");
827 
828  // Before we go any further, try the complete->base constructor
829  // delegation optimization.
830  if (CtorType == Ctor_Complete && IsConstructorDelegationValid(Ctor) &&
831  CGM.getTarget().getCXXABI().hasConstructorVariants()) {
832  EmitDelegateCXXConstructorCall(Ctor, Ctor_Base, Args, Ctor->getEndLoc());
833  return;
834  }
835 
836  const FunctionDecl *Definition = nullptr;
837  Stmt *Body = Ctor->getBody(Definition);
838  assert(Definition == Ctor && "emitting wrong constructor body");
839 
840  // Enter the function-try-block before the constructor prologue if
841  // applicable.
842  bool IsTryBody = (Body && isa<CXXTryStmt>(Body));
843  if (IsTryBody)
844  EnterCXXTryStmt(*cast<CXXTryStmt>(Body), true);
845 
846  incrementProfileCounter(Body);
847 
848  RunCleanupsScope RunCleanups(*this);
849 
850  // TODO: in restricted cases, we can emit the vbase initializers of
851  // a complete ctor and then delegate to the base ctor.
852 
853  // Emit the constructor prologue, i.e. the base and member
854  // initializers.
855  EmitCtorPrologue(Ctor, CtorType, Args);
856 
857  // Emit the body of the statement.
858  if (IsTryBody)
859  EmitStmt(cast<CXXTryStmt>(Body)->getTryBlock());
860  else if (Body)
861  EmitStmt(Body);
862 
863  // Emit any cleanup blocks associated with the member or base
864  // initializers, which includes (along the exceptional path) the
865  // destructors for those members and bases that were fully
866  // constructed.
867  RunCleanups.ForceCleanup();
868 
869  if (IsTryBody)
870  ExitCXXTryStmt(*cast<CXXTryStmt>(Body), true);
871 }
872 
873 namespace {
874  /// RAII object to indicate that codegen is copying the value representation
875  /// instead of the object representation. Useful when copying a struct or
876  /// class which has uninitialized members and we're only performing
877  /// lvalue-to-rvalue conversion on the object but not its members.
878  class CopyingValueRepresentation {
879  public:
880  explicit CopyingValueRepresentation(CodeGenFunction &CGF)
881  : CGF(CGF), OldSanOpts(CGF.SanOpts) {
882  CGF.SanOpts.set(SanitizerKind::Bool, false);
883  CGF.SanOpts.set(SanitizerKind::Enum, false);
884  }
885  ~CopyingValueRepresentation() {
886  CGF.SanOpts = OldSanOpts;
887  }
888  private:
889  CodeGenFunction &CGF;
890  SanitizerSet OldSanOpts;
891  };
892 } // end anonymous namespace
893 
894 namespace {
895  class FieldMemcpyizer {
896  public:
897  FieldMemcpyizer(CodeGenFunction &CGF, const CXXRecordDecl *ClassDecl,
898  const VarDecl *SrcRec)
899  : CGF(CGF), ClassDecl(ClassDecl), SrcRec(SrcRec),
900  RecLayout(CGF.getContext().getASTRecordLayout(ClassDecl)),
901  FirstField(nullptr), LastField(nullptr), FirstFieldOffset(0),
902  LastFieldOffset(0), LastAddedFieldIndex(0) {}
903 
904  bool isMemcpyableField(FieldDecl *F) const {
905  // Never memcpy fields when we are adding poisoned paddings.
906  if (CGF.getContext().getLangOpts().SanitizeAddressFieldPadding)
907  return false;
908  Qualifiers Qual = F->getType().getQualifiers();
909  if (Qual.hasVolatile() || Qual.hasObjCLifetime())
910  return false;
911  return true;
912  }
913 
914  void addMemcpyableField(FieldDecl *F) {
915  if (!FirstField)
916  addInitialField(F);
917  else
918  addNextField(F);
919  }
920 
921  CharUnits getMemcpySize(uint64_t FirstByteOffset) const {
922  ASTContext &Ctx = CGF.getContext();
923  unsigned LastFieldSize =
924  LastField->isBitField()
925  ? LastField->getBitWidthValue(Ctx)
926  : Ctx.toBits(
927  Ctx.getTypeInfoDataSizeInChars(LastField->getType()).first);
928  uint64_t MemcpySizeBits = LastFieldOffset + LastFieldSize -
929  FirstByteOffset + Ctx.getCharWidth() - 1;
930  CharUnits MemcpySize = Ctx.toCharUnitsFromBits(MemcpySizeBits);
931  return MemcpySize;
932  }
933 
934  void emitMemcpy() {
935  // Give the subclass a chance to bail out if it feels the memcpy isn't
936  // worth it (e.g. Hasn't aggregated enough data).
937  if (!FirstField) {
938  return;
939  }
940 
941  uint64_t FirstByteOffset;
942  if (FirstField->isBitField()) {
943  const CGRecordLayout &RL =
944  CGF.getTypes().getCGRecordLayout(FirstField->getParent());
945  const CGBitFieldInfo &BFInfo = RL.getBitFieldInfo(FirstField);
946  // FirstFieldOffset is not appropriate for bitfields,
947  // we need to use the storage offset instead.
948  FirstByteOffset = CGF.getContext().toBits(BFInfo.StorageOffset);
949  } else {
950  FirstByteOffset = FirstFieldOffset;
951  }
952 
953  CharUnits MemcpySize = getMemcpySize(FirstByteOffset);
954  QualType RecordTy = CGF.getContext().getTypeDeclType(ClassDecl);
955  Address ThisPtr = CGF.LoadCXXThisAddress();
956  LValue DestLV = CGF.MakeAddrLValue(ThisPtr, RecordTy);
957  LValue Dest = CGF.EmitLValueForFieldInitialization(DestLV, FirstField);
958  llvm::Value *SrcPtr = CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(SrcRec));
959  LValue SrcLV = CGF.MakeNaturalAlignAddrLValue(SrcPtr, RecordTy);
960  LValue Src = CGF.EmitLValueForFieldInitialization(SrcLV, FirstField);
961 
962  emitMemcpyIR(Dest.isBitField() ? Dest.getBitFieldAddress() : Dest.getAddress(),
963  Src.isBitField() ? Src.getBitFieldAddress() : Src.getAddress(),
964  MemcpySize);
965  reset();
966  }
967 
968  void reset() {
969  FirstField = nullptr;
970  }
971 
972  protected:
973  CodeGenFunction &CGF;
974  const CXXRecordDecl *ClassDecl;
975 
976  private:
977  void emitMemcpyIR(Address DestPtr, Address SrcPtr, CharUnits Size) {
978  llvm::PointerType *DPT = DestPtr.getType();
979  llvm::Type *DBP =
980  llvm::Type::getInt8PtrTy(CGF.getLLVMContext(), DPT->getAddressSpace());
981  DestPtr = CGF.Builder.CreateBitCast(DestPtr, DBP);
982 
983  llvm::PointerType *SPT = SrcPtr.getType();
984  llvm::Type *SBP =
985  llvm::Type::getInt8PtrTy(CGF.getLLVMContext(), SPT->getAddressSpace());
986  SrcPtr = CGF.Builder.CreateBitCast(SrcPtr, SBP);
987 
988  CGF.Builder.CreateMemCpy(DestPtr, SrcPtr, Size.getQuantity());
989  }
990 
991  void addInitialField(FieldDecl *F) {
992  FirstField = F;
993  LastField = F;
994  FirstFieldOffset = RecLayout.getFieldOffset(F->getFieldIndex());
995  LastFieldOffset = FirstFieldOffset;
996  LastAddedFieldIndex = F->getFieldIndex();
997  }
998 
999  void addNextField(FieldDecl *F) {
1000  // For the most part, the following invariant will hold:
1001  // F->getFieldIndex() == LastAddedFieldIndex + 1
1002  // The one exception is that Sema won't add a copy-initializer for an
1003  // unnamed bitfield, which will show up here as a gap in the sequence.
1004  assert(F->getFieldIndex() >= LastAddedFieldIndex + 1 &&
1005  "Cannot aggregate fields out of order.");
1006  LastAddedFieldIndex = F->getFieldIndex();
1007 
1008  // The 'first' and 'last' fields are chosen by offset, rather than field
1009  // index. This allows the code to support bitfields, as well as regular
1010  // fields.
1011  uint64_t FOffset = RecLayout.getFieldOffset(F->getFieldIndex());
1012  if (FOffset < FirstFieldOffset) {
1013  FirstField = F;
1014  FirstFieldOffset = FOffset;
1015  } else if (FOffset > LastFieldOffset) {
1016  LastField = F;
1017  LastFieldOffset = FOffset;
1018  }
1019  }
1020 
1021  const VarDecl *SrcRec;
1022  const ASTRecordLayout &RecLayout;
1023  FieldDecl *FirstField;
1024  FieldDecl *LastField;
1025  uint64_t FirstFieldOffset, LastFieldOffset;
1026  unsigned LastAddedFieldIndex;
1027  };
1028 
1029  class ConstructorMemcpyizer : public FieldMemcpyizer {
1030  private:
1031  /// Get source argument for copy constructor. Returns null if not a copy
1032  /// constructor.
1033  static const VarDecl *getTrivialCopySource(CodeGenFunction &CGF,
1034  const CXXConstructorDecl *CD,
1035  FunctionArgList &Args) {
1036  if (CD->isCopyOrMoveConstructor() && CD->isDefaulted())
1037  return Args[CGF.CGM.getCXXABI().getSrcArgforCopyCtor(CD, Args)];
1038  return nullptr;
1039  }
1040 
1041  // Returns true if a CXXCtorInitializer represents a member initialization
1042  // that can be rolled into a memcpy.
1043  bool isMemberInitMemcpyable(CXXCtorInitializer *MemberInit) const {
1044  if (!MemcpyableCtor)
1045  return false;
1046  FieldDecl *Field = MemberInit->getMember();
1047  assert(Field && "No field for member init.");
1048  QualType FieldType = Field->getType();
1049  CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(MemberInit->getInit());
1050 
1051  // Bail out on non-memcpyable, not-trivially-copyable members.
1052  if (!(CE && isMemcpyEquivalentSpecialMember(CE->getConstructor())) &&
1053  !(FieldType.isTriviallyCopyableType(CGF.getContext()) ||
1054  FieldType->isReferenceType()))
1055  return false;
1056 
1057  // Bail out on volatile fields.
1058  if (!isMemcpyableField(Field))
1059  return false;
1060 
1061  // Otherwise we're good.
1062  return true;
1063  }
1064 
1065  public:
1066  ConstructorMemcpyizer(CodeGenFunction &CGF, const CXXConstructorDecl *CD,
1067  FunctionArgList &Args)
1068  : FieldMemcpyizer(CGF, CD->getParent(), getTrivialCopySource(CGF, CD, Args)),
1069  ConstructorDecl(CD),
1070  MemcpyableCtor(CD->isDefaulted() &&
1071  CD->isCopyOrMoveConstructor() &&
1072  CGF.getLangOpts().getGC() == LangOptions::NonGC),
1073  Args(Args) { }
1074 
1075  void addMemberInitializer(CXXCtorInitializer *MemberInit) {
1076  if (isMemberInitMemcpyable(MemberInit)) {
1077  AggregatedInits.push_back(MemberInit);
1078  addMemcpyableField(MemberInit->getMember());
1079  } else {
1080  emitAggregatedInits();
1081  EmitMemberInitializer(CGF, ConstructorDecl->getParent(), MemberInit,
1082  ConstructorDecl, Args);
1083  }
1084  }
1085 
1086  void emitAggregatedInits() {
1087  if (AggregatedInits.size() <= 1) {
1088  // This memcpy is too small to be worthwhile. Fall back on default
1089  // codegen.
1090  if (!AggregatedInits.empty()) {
1091  CopyingValueRepresentation CVR(CGF);
1092  EmitMemberInitializer(CGF, ConstructorDecl->getParent(),
1093  AggregatedInits[0], ConstructorDecl, Args);
1094  AggregatedInits.clear();
1095  }
1096  reset();
1097  return;
1098  }
1099 
1100  pushEHDestructors();
1101  emitMemcpy();
1102  AggregatedInits.clear();
1103  }
1104 
1105  void pushEHDestructors() {
1106  Address ThisPtr = CGF.LoadCXXThisAddress();
1107  QualType RecordTy = CGF.getContext().getTypeDeclType(ClassDecl);
1108  LValue LHS = CGF.MakeAddrLValue(ThisPtr, RecordTy);
1109 
1110  for (unsigned i = 0; i < AggregatedInits.size(); ++i) {
1111  CXXCtorInitializer *MemberInit = AggregatedInits[i];
1112  QualType FieldType = MemberInit->getAnyMember()->getType();
1113  QualType::DestructionKind dtorKind = FieldType.isDestructedType();
1114  if (!CGF.needsEHCleanup(dtorKind))
1115  continue;
1116  LValue FieldLHS = LHS;
1117  EmitLValueForAnyFieldInitialization(CGF, MemberInit, FieldLHS);
1118  CGF.pushEHDestroy(dtorKind, FieldLHS.getAddress(), FieldType);
1119  }
1120  }
1121 
1122  void finish() {
1123  emitAggregatedInits();
1124  }
1125 
1126  private:
1127  const CXXConstructorDecl *ConstructorDecl;
1128  bool MemcpyableCtor;
1129  FunctionArgList &Args;
1130  SmallVector<CXXCtorInitializer*, 16> AggregatedInits;
1131  };
1132 
1133  class AssignmentMemcpyizer : public FieldMemcpyizer {
1134  private:
1135  // Returns the memcpyable field copied by the given statement, if one
1136  // exists. Otherwise returns null.
1137  FieldDecl *getMemcpyableField(Stmt *S) {
1138  if (!AssignmentsMemcpyable)
1139  return nullptr;
1140  if (BinaryOperator *BO = dyn_cast<BinaryOperator>(S)) {
1141  // Recognise trivial assignments.
1142  if (BO->getOpcode() != BO_Assign)
1143  return nullptr;
1144  MemberExpr *ME = dyn_cast<MemberExpr>(BO->getLHS());
1145  if (!ME)
1146  return nullptr;
1147  FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl());
1148  if (!Field || !isMemcpyableField(Field))
1149  return nullptr;
1150  Stmt *RHS = BO->getRHS();
1151  if (ImplicitCastExpr *EC = dyn_cast<ImplicitCastExpr>(RHS))
1152  RHS = EC->getSubExpr();
1153  if (!RHS)
1154  return nullptr;
1155  if (MemberExpr *ME2 = dyn_cast<MemberExpr>(RHS)) {
1156  if (ME2->getMemberDecl() == Field)
1157  return Field;
1158  }
1159  return nullptr;
1160  } else if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(S)) {
1161  CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MCE->getCalleeDecl());
1162  if (!(MD && isMemcpyEquivalentSpecialMember(MD)))
1163  return nullptr;
1164  MemberExpr *IOA = dyn_cast<MemberExpr>(MCE->getImplicitObjectArgument());
1165  if (!IOA)
1166  return nullptr;
1167  FieldDecl *Field = dyn_cast<FieldDecl>(IOA->getMemberDecl());
1168  if (!Field || !isMemcpyableField(Field))
1169  return nullptr;
1170  MemberExpr *Arg0 = dyn_cast<MemberExpr>(MCE->getArg(0));
1171  if (!Arg0 || Field != dyn_cast<FieldDecl>(Arg0->getMemberDecl()))
1172  return nullptr;
1173  return Field;
1174  } else if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
1175  FunctionDecl *FD = dyn_cast<FunctionDecl>(CE->getCalleeDecl());
1176  if (!FD || FD->getBuiltinID() != Builtin::BI__builtin_memcpy)
1177  return nullptr;
1178  Expr *DstPtr = CE->getArg(0);
1179  if (ImplicitCastExpr *DC = dyn_cast<ImplicitCastExpr>(DstPtr))
1180  DstPtr = DC->getSubExpr();
1181  UnaryOperator *DUO = dyn_cast<UnaryOperator>(DstPtr);
1182  if (!DUO || DUO->getOpcode() != UO_AddrOf)
1183  return nullptr;
1184  MemberExpr *ME = dyn_cast<MemberExpr>(DUO->getSubExpr());
1185  if (!ME)
1186  return nullptr;
1187  FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl());
1188  if (!Field || !isMemcpyableField(Field))
1189  return nullptr;
1190  Expr *SrcPtr = CE->getArg(1);
1191  if (ImplicitCastExpr *SC = dyn_cast<ImplicitCastExpr>(SrcPtr))
1192  SrcPtr = SC->getSubExpr();
1193  UnaryOperator *SUO = dyn_cast<UnaryOperator>(SrcPtr);
1194  if (!SUO || SUO->getOpcode() != UO_AddrOf)
1195  return nullptr;
1196  MemberExpr *ME2 = dyn_cast<MemberExpr>(SUO->getSubExpr());
1197  if (!ME2 || Field != dyn_cast<FieldDecl>(ME2->getMemberDecl()))
1198  return nullptr;
1199  return Field;
1200  }
1201 
1202  return nullptr;
1203  }
1204 
1205  bool AssignmentsMemcpyable;
1206  SmallVector<Stmt*, 16> AggregatedStmts;
1207 
1208  public:
1209  AssignmentMemcpyizer(CodeGenFunction &CGF, const CXXMethodDecl *AD,
1210  FunctionArgList &Args)
1211  : FieldMemcpyizer(CGF, AD->getParent(), Args[Args.size() - 1]),
1212  AssignmentsMemcpyable(CGF.getLangOpts().getGC() == LangOptions::NonGC) {
1213  assert(Args.size() == 2);
1214  }
1215 
1216  void emitAssignment(Stmt *S) {
1217  FieldDecl *F = getMemcpyableField(S);
1218  if (F) {
1219  addMemcpyableField(F);
1220  AggregatedStmts.push_back(S);
1221  } else {
1222  emitAggregatedStmts();
1223  CGF.EmitStmt(S);
1224  }
1225  }
1226 
1227  void emitAggregatedStmts() {
1228  if (AggregatedStmts.size() <= 1) {
1229  if (!AggregatedStmts.empty()) {
1230  CopyingValueRepresentation CVR(CGF);
1231  CGF.EmitStmt(AggregatedStmts[0]);
1232  }
1233  reset();
1234  }
1235 
1236  emitMemcpy();
1237  AggregatedStmts.clear();
1238  }
1239 
1240  void finish() {
1241  emitAggregatedStmts();
1242  }
1243  };
1244 } // end anonymous namespace
1245 
1246 static bool isInitializerOfDynamicClass(const CXXCtorInitializer *BaseInit) {
1247  const Type *BaseType = BaseInit->getBaseClass();
1248  const auto *BaseClassDecl =
1249  cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl());
1250  return BaseClassDecl->isDynamicClass();
1251 }
1252 
1253 /// EmitCtorPrologue - This routine generates necessary code to initialize
1254 /// base classes and non-static data members belonging to this constructor.
1256  CXXCtorType CtorType,
1257  FunctionArgList &Args) {
1258  if (CD->isDelegatingConstructor())
1259  return EmitDelegatingCXXConstructorCall(CD, Args);
1260 
1261  const CXXRecordDecl *ClassDecl = CD->getParent();
1262 
1264  E = CD->init_end();
1265 
1266  llvm::BasicBlock *BaseCtorContinueBB = nullptr;
1267  if (ClassDecl->getNumVBases() &&
1268  !CGM.getTarget().getCXXABI().hasConstructorVariants()) {
1269  // The ABIs that don't have constructor variants need to put a branch
1270  // before the virtual base initialization code.
1271  BaseCtorContinueBB =
1272  CGM.getCXXABI().EmitCtorCompleteObjectHandler(*this, ClassDecl);
1273  assert(BaseCtorContinueBB);
1274  }
1275 
1276  llvm::Value *const OldThis = CXXThisValue;
1277  // Virtual base initializers first.
1278  for (; B != E && (*B)->isBaseInitializer() && (*B)->isBaseVirtual(); B++) {
1279  if (CGM.getCodeGenOpts().StrictVTablePointers &&
1280  CGM.getCodeGenOpts().OptimizationLevel > 0 &&
1282  CXXThisValue = Builder.CreateLaunderInvariantGroup(LoadCXXThis());
1283  EmitBaseInitializer(*this, ClassDecl, *B, CtorType);
1284  }
1285 
1286  if (BaseCtorContinueBB) {
1287  // Complete object handler should continue to the remaining initializers.
1288  Builder.CreateBr(BaseCtorContinueBB);
1289  EmitBlock(BaseCtorContinueBB);
1290  }
1291 
1292  // Then, non-virtual base initializers.
1293  for (; B != E && (*B)->isBaseInitializer(); B++) {
1294  assert(!(*B)->isBaseVirtual());
1295 
1296  if (CGM.getCodeGenOpts().StrictVTablePointers &&
1297  CGM.getCodeGenOpts().OptimizationLevel > 0 &&
1299  CXXThisValue = Builder.CreateLaunderInvariantGroup(LoadCXXThis());
1300  EmitBaseInitializer(*this, ClassDecl, *B, CtorType);
1301  }
1302 
1303  CXXThisValue = OldThis;
1304 
1305  InitializeVTablePointers(ClassDecl);
1306 
1307  // And finally, initialize class members.
1308  FieldConstructionScope FCS(*this, LoadCXXThisAddress());
1309  ConstructorMemcpyizer CM(*this, CD, Args);
1310  for (; B != E; B++) {
1311  CXXCtorInitializer *Member = (*B);
1312  assert(!Member->isBaseInitializer());
1313  assert(Member->isAnyMemberInitializer() &&
1314  "Delegating initializer on non-delegating constructor");
1315  CM.addMemberInitializer(Member);
1316  }
1317  CM.finish();
1318 }
1319 
1320 static bool
1321 FieldHasTrivialDestructorBody(ASTContext &Context, const FieldDecl *Field);
1322 
1323 static bool
1325  const CXXRecordDecl *BaseClassDecl,
1326  const CXXRecordDecl *MostDerivedClassDecl)
1327 {
1328  // If the destructor is trivial we don't have to check anything else.
1329  if (BaseClassDecl->hasTrivialDestructor())
1330  return true;
1331 
1332  if (!BaseClassDecl->getDestructor()->hasTrivialBody())
1333  return false;
1334 
1335  // Check fields.
1336  for (const auto *Field : BaseClassDecl->fields())
1337  if (!FieldHasTrivialDestructorBody(Context, Field))
1338  return false;
1339 
1340  // Check non-virtual bases.
1341  for (const auto &I : BaseClassDecl->bases()) {
1342  if (I.isVirtual())
1343  continue;
1344 
1345  const CXXRecordDecl *NonVirtualBase =
1346  cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
1347  if (!HasTrivialDestructorBody(Context, NonVirtualBase,
1348  MostDerivedClassDecl))
1349  return false;
1350  }
1351 
1352  if (BaseClassDecl == MostDerivedClassDecl) {
1353  // Check virtual bases.
1354  for (const auto &I : BaseClassDecl->vbases()) {
1355  const CXXRecordDecl *VirtualBase =
1356  cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
1357  if (!HasTrivialDestructorBody(Context, VirtualBase,
1358  MostDerivedClassDecl))
1359  return false;
1360  }
1361  }
1362 
1363  return true;
1364 }
1365 
1366 static bool
1368  const FieldDecl *Field)
1369 {
1370  QualType FieldBaseElementType = Context.getBaseElementType(Field->getType());
1371 
1372  const RecordType *RT = FieldBaseElementType->getAs<RecordType>();
1373  if (!RT)
1374  return true;
1375 
1376  CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
1377 
1378  // The destructor for an implicit anonymous union member is never invoked.
1379  if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
1380  return false;
1381 
1382  return HasTrivialDestructorBody(Context, FieldClassDecl, FieldClassDecl);
1383 }
1384 
1385 /// CanSkipVTablePointerInitialization - Check whether we need to initialize
1386 /// any vtable pointers before calling this destructor.
1388  const CXXDestructorDecl *Dtor) {
1389  const CXXRecordDecl *ClassDecl = Dtor->getParent();
1390  if (!ClassDecl->isDynamicClass())
1391  return true;
1392 
1393  if (!Dtor->hasTrivialBody())
1394  return false;
1395 
1396  // Check the fields.
1397  for (const auto *Field : ClassDecl->fields())
1398  if (!FieldHasTrivialDestructorBody(CGF.getContext(), Field))
1399  return false;
1400 
1401  return true;
1402 }
1403 
1404 /// EmitDestructorBody - Emits the body of the current destructor.
1406  const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CurGD.getDecl());
1407  CXXDtorType DtorType = CurGD.getDtorType();
1408 
1409  // For an abstract class, non-base destructors are never used (and can't
1410  // be emitted in general, because vbase dtors may not have been validated
1411  // by Sema), but the Itanium ABI doesn't make them optional and Clang may
1412  // in fact emit references to them from other compilations, so emit them
1413  // as functions containing a trap instruction.
1414  if (DtorType != Dtor_Base && Dtor->getParent()->isAbstract()) {
1415  llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
1416  TrapCall->setDoesNotReturn();
1417  TrapCall->setDoesNotThrow();
1418  Builder.CreateUnreachable();
1419  Builder.ClearInsertionPoint();
1420  return;
1421  }
1422 
1423  Stmt *Body = Dtor->getBody();
1424  if (Body)
1425  incrementProfileCounter(Body);
1426 
1427  // The call to operator delete in a deleting destructor happens
1428  // outside of the function-try-block, which means it's always
1429  // possible to delegate the destructor body to the complete
1430  // destructor. Do so.
1431  if (DtorType == Dtor_Deleting) {
1432  RunCleanupsScope DtorEpilogue(*this);
1433  EnterDtorCleanups(Dtor, Dtor_Deleting);
1434  if (HaveInsertPoint())
1435  EmitCXXDestructorCall(Dtor, Dtor_Complete, /*ForVirtualBase=*/false,
1436  /*Delegating=*/false, LoadCXXThisAddress());
1437  return;
1438  }
1439 
1440  // If the body is a function-try-block, enter the try before
1441  // anything else.
1442  bool isTryBody = (Body && isa<CXXTryStmt>(Body));
1443  if (isTryBody)
1444  EnterCXXTryStmt(*cast<CXXTryStmt>(Body), true);
1445  EmitAsanPrologueOrEpilogue(false);
1446 
1447  // Enter the epilogue cleanups.
1448  RunCleanupsScope DtorEpilogue(*this);
1449 
1450  // If this is the complete variant, just invoke the base variant;
1451  // the epilogue will destruct the virtual bases. But we can't do
1452  // this optimization if the body is a function-try-block, because
1453  // we'd introduce *two* handler blocks. In the Microsoft ABI, we
1454  // always delegate because we might not have a definition in this TU.
1455  switch (DtorType) {
1456  case Dtor_Comdat: llvm_unreachable("not expecting a COMDAT");
1457  case Dtor_Deleting: llvm_unreachable("already handled deleting case");
1458 
1459  case Dtor_Complete:
1460  assert((Body || getTarget().getCXXABI().isMicrosoft()) &&
1461  "can't emit a dtor without a body for non-Microsoft ABIs");
1462 
1463  // Enter the cleanup scopes for virtual bases.
1464  EnterDtorCleanups(Dtor, Dtor_Complete);
1465 
1466  if (!isTryBody) {
1467  EmitCXXDestructorCall(Dtor, Dtor_Base, /*ForVirtualBase=*/false,
1468  /*Delegating=*/false, LoadCXXThisAddress());
1469  break;
1470  }
1471 
1472  // Fallthrough: act like we're in the base variant.
1473  LLVM_FALLTHROUGH;
1474 
1475  case Dtor_Base:
1476  assert(Body);
1477 
1478  // Enter the cleanup scopes for fields and non-virtual bases.
1479  EnterDtorCleanups(Dtor, Dtor_Base);
1480 
1481  // Initialize the vtable pointers before entering the body.
1482  if (!CanSkipVTablePointerInitialization(*this, Dtor)) {
1483  // Insert the llvm.launder.invariant.group intrinsic before initializing
1484  // the vptrs to cancel any previous assumptions we might have made.
1485  if (CGM.getCodeGenOpts().StrictVTablePointers &&
1486  CGM.getCodeGenOpts().OptimizationLevel > 0)
1487  CXXThisValue = Builder.CreateLaunderInvariantGroup(LoadCXXThis());
1488  InitializeVTablePointers(Dtor->getParent());
1489  }
1490 
1491  if (isTryBody)
1492  EmitStmt(cast<CXXTryStmt>(Body)->getTryBlock());
1493  else if (Body)
1494  EmitStmt(Body);
1495  else {
1496  assert(Dtor->isImplicit() && "bodyless dtor not implicit");
1497  // nothing to do besides what's in the epilogue
1498  }
1499  // -fapple-kext must inline any call to this dtor into
1500  // the caller's body.
1501  if (getLangOpts().AppleKext)
1502  CurFn->addFnAttr(llvm::Attribute::AlwaysInline);
1503 
1504  break;
1505  }
1506 
1507  // Jump out through the epilogue cleanups.
1508  DtorEpilogue.ForceCleanup();
1509 
1510  // Exit the try if applicable.
1511  if (isTryBody)
1512  ExitCXXTryStmt(*cast<CXXTryStmt>(Body), true);
1513 }
1514 
1516  const CXXMethodDecl *AssignOp = cast<CXXMethodDecl>(CurGD.getDecl());
1517  const Stmt *RootS = AssignOp->getBody();
1518  assert(isa<CompoundStmt>(RootS) &&
1519  "Body of an implicit assignment operator should be compound stmt.");
1520  const CompoundStmt *RootCS = cast<CompoundStmt>(RootS);
1521 
1522  LexicalScope Scope(*this, RootCS->getSourceRange());
1523 
1524  incrementProfileCounter(RootCS);
1525  AssignmentMemcpyizer AM(*this, AssignOp, Args);
1526  for (auto *I : RootCS->body())
1527  AM.emitAssignment(I);
1528  AM.finish();
1529 }
1530 
1531 namespace {
1532  llvm::Value *LoadThisForDtorDelete(CodeGenFunction &CGF,
1533  const CXXDestructorDecl *DD) {
1534  if (Expr *ThisArg = DD->getOperatorDeleteThisArg())
1535  return CGF.EmitScalarExpr(ThisArg);
1536  return CGF.LoadCXXThis();
1537  }
1538 
1539  /// Call the operator delete associated with the current destructor.
1540  struct CallDtorDelete final : EHScopeStack::Cleanup {
1541  CallDtorDelete() {}
1542 
1543  void Emit(CodeGenFunction &CGF, Flags flags) override {
1544  const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CGF.CurCodeDecl);
1545  const CXXRecordDecl *ClassDecl = Dtor->getParent();
1546  CGF.EmitDeleteCall(Dtor->getOperatorDelete(),
1547  LoadThisForDtorDelete(CGF, Dtor),
1548  CGF.getContext().getTagDeclType(ClassDecl));
1549  }
1550  };
1551 
1552  void EmitConditionalDtorDeleteCall(CodeGenFunction &CGF,
1553  llvm::Value *ShouldDeleteCondition,
1554  bool ReturnAfterDelete) {
1555  llvm::BasicBlock *callDeleteBB = CGF.createBasicBlock("dtor.call_delete");
1556  llvm::BasicBlock *continueBB = CGF.createBasicBlock("dtor.continue");
1557  llvm::Value *ShouldCallDelete
1558  = CGF.Builder.CreateIsNull(ShouldDeleteCondition);
1559  CGF.Builder.CreateCondBr(ShouldCallDelete, continueBB, callDeleteBB);
1560 
1561  CGF.EmitBlock(callDeleteBB);
1562  const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CGF.CurCodeDecl);
1563  const CXXRecordDecl *ClassDecl = Dtor->getParent();
1564  CGF.EmitDeleteCall(Dtor->getOperatorDelete(),
1565  LoadThisForDtorDelete(CGF, Dtor),
1566  CGF.getContext().getTagDeclType(ClassDecl));
1567  assert(Dtor->getOperatorDelete()->isDestroyingOperatorDelete() ==
1568  ReturnAfterDelete &&
1569  "unexpected value for ReturnAfterDelete");
1570  if (ReturnAfterDelete)
1572  else
1573  CGF.Builder.CreateBr(continueBB);
1574 
1575  CGF.EmitBlock(continueBB);
1576  }
1577 
1578  struct CallDtorDeleteConditional final : EHScopeStack::Cleanup {
1579  llvm::Value *ShouldDeleteCondition;
1580 
1581  public:
1582  CallDtorDeleteConditional(llvm::Value *ShouldDeleteCondition)
1583  : ShouldDeleteCondition(ShouldDeleteCondition) {
1584  assert(ShouldDeleteCondition != nullptr);
1585  }
1586 
1587  void Emit(CodeGenFunction &CGF, Flags flags) override {
1588  EmitConditionalDtorDeleteCall(CGF, ShouldDeleteCondition,
1589  /*ReturnAfterDelete*/false);
1590  }
1591  };
1592 
1593  class DestroyField final : public EHScopeStack::Cleanup {
1594  const FieldDecl *field;
1595  CodeGenFunction::Destroyer *destroyer;
1596  bool useEHCleanupForArray;
1597 
1598  public:
1599  DestroyField(const FieldDecl *field, CodeGenFunction::Destroyer *destroyer,
1600  bool useEHCleanupForArray)
1601  : field(field), destroyer(destroyer),
1602  useEHCleanupForArray(useEHCleanupForArray) {}
1603 
1604  void Emit(CodeGenFunction &CGF, Flags flags) override {
1605  // Find the address of the field.
1606  Address thisValue = CGF.LoadCXXThisAddress();
1607  QualType RecordTy = CGF.getContext().getTagDeclType(field->getParent());
1608  LValue ThisLV = CGF.MakeAddrLValue(thisValue, RecordTy);
1609  LValue LV = CGF.EmitLValueForField(ThisLV, field);
1610  assert(LV.isSimple());
1611 
1612  CGF.emitDestroy(LV.getAddress(), field->getType(), destroyer,
1613  flags.isForNormalCleanup() && useEHCleanupForArray);
1614  }
1615  };
1616 
1617  static void EmitSanitizerDtorCallback(CodeGenFunction &CGF, llvm::Value *Ptr,
1618  CharUnits::QuantityType PoisonSize) {
1619  CodeGenFunction::SanitizerScope SanScope(&CGF);
1620  // Pass in void pointer and size of region as arguments to runtime
1621  // function
1622  llvm::Value *Args[] = {CGF.Builder.CreateBitCast(Ptr, CGF.VoidPtrTy),
1623  llvm::ConstantInt::get(CGF.SizeTy, PoisonSize)};
1624 
1625  llvm::Type *ArgTypes[] = {CGF.VoidPtrTy, CGF.SizeTy};
1626 
1627  llvm::FunctionType *FnType =
1628  llvm::FunctionType::get(CGF.VoidTy, ArgTypes, false);
1629  llvm::Value *Fn =
1630  CGF.CGM.CreateRuntimeFunction(FnType, "__sanitizer_dtor_callback");
1631  CGF.EmitNounwindRuntimeCall(Fn, Args);
1632  }
1633 
1634  class SanitizeDtorMembers final : public EHScopeStack::Cleanup {
1635  const CXXDestructorDecl *Dtor;
1636 
1637  public:
1638  SanitizeDtorMembers(const CXXDestructorDecl *Dtor) : Dtor(Dtor) {}
1639 
1640  // Generate function call for handling object poisoning.
1641  // Disables tail call elimination, to prevent the current stack frame
1642  // from disappearing from the stack trace.
1643  void Emit(CodeGenFunction &CGF, Flags flags) override {
1644  const ASTRecordLayout &Layout =
1645  CGF.getContext().getASTRecordLayout(Dtor->getParent());
1646 
1647  // Nothing to poison.
1648  if (Layout.getFieldCount() == 0)
1649  return;
1650 
1651  // Prevent the current stack frame from disappearing from the stack trace.
1652  CGF.CurFn->addFnAttr("disable-tail-calls", "true");
1653 
1654  // Construct pointer to region to begin poisoning, and calculate poison
1655  // size, so that only members declared in this class are poisoned.
1656  ASTContext &Context = CGF.getContext();
1657  unsigned fieldIndex = 0;
1658  int startIndex = -1;
1659  // RecordDecl::field_iterator Field;
1660  for (const FieldDecl *Field : Dtor->getParent()->fields()) {
1661  // Poison field if it is trivial
1662  if (FieldHasTrivialDestructorBody(Context, Field)) {
1663  // Start sanitizing at this field
1664  if (startIndex < 0)
1665  startIndex = fieldIndex;
1666 
1667  // Currently on the last field, and it must be poisoned with the
1668  // current block.
1669  if (fieldIndex == Layout.getFieldCount() - 1) {
1670  PoisonMembers(CGF, startIndex, Layout.getFieldCount());
1671  }
1672  } else if (startIndex >= 0) {
1673  // No longer within a block of memory to poison, so poison the block
1674  PoisonMembers(CGF, startIndex, fieldIndex);
1675  // Re-set the start index
1676  startIndex = -1;
1677  }
1678  fieldIndex += 1;
1679  }
1680  }
1681 
1682  private:
1683  /// \param layoutStartOffset index of the ASTRecordLayout field to
1684  /// start poisoning (inclusive)
1685  /// \param layoutEndOffset index of the ASTRecordLayout field to
1686  /// end poisoning (exclusive)
1687  void PoisonMembers(CodeGenFunction &CGF, unsigned layoutStartOffset,
1688  unsigned layoutEndOffset) {
1689  ASTContext &Context = CGF.getContext();
1690  const ASTRecordLayout &Layout =
1691  Context.getASTRecordLayout(Dtor->getParent());
1692 
1693  llvm::ConstantInt *OffsetSizePtr = llvm::ConstantInt::get(
1694  CGF.SizeTy,
1695  Context.toCharUnitsFromBits(Layout.getFieldOffset(layoutStartOffset))
1696  .getQuantity());
1697 
1698  llvm::Value *OffsetPtr = CGF.Builder.CreateGEP(
1699  CGF.Builder.CreateBitCast(CGF.LoadCXXThis(), CGF.Int8PtrTy),
1700  OffsetSizePtr);
1701 
1702  CharUnits::QuantityType PoisonSize;
1703  if (layoutEndOffset >= Layout.getFieldCount()) {
1704  PoisonSize = Layout.getNonVirtualSize().getQuantity() -
1705  Context.toCharUnitsFromBits(
1706  Layout.getFieldOffset(layoutStartOffset))
1707  .getQuantity();
1708  } else {
1709  PoisonSize = Context.toCharUnitsFromBits(
1710  Layout.getFieldOffset(layoutEndOffset) -
1711  Layout.getFieldOffset(layoutStartOffset))
1712  .getQuantity();
1713  }
1714 
1715  if (PoisonSize == 0)
1716  return;
1717 
1718  EmitSanitizerDtorCallback(CGF, OffsetPtr, PoisonSize);
1719  }
1720  };
1721 
1722  class SanitizeDtorVTable final : public EHScopeStack::Cleanup {
1723  const CXXDestructorDecl *Dtor;
1724 
1725  public:
1726  SanitizeDtorVTable(const CXXDestructorDecl *Dtor) : Dtor(Dtor) {}
1727 
1728  // Generate function call for handling vtable pointer poisoning.
1729  void Emit(CodeGenFunction &CGF, Flags flags) override {
1730  assert(Dtor->getParent()->isDynamicClass());
1731  (void)Dtor;
1732  ASTContext &Context = CGF.getContext();
1733  // Poison vtable and vtable ptr if they exist for this class.
1734  llvm::Value *VTablePtr = CGF.LoadCXXThis();
1735 
1736  CharUnits::QuantityType PoisonSize =
1737  Context.toCharUnitsFromBits(CGF.PointerWidthInBits).getQuantity();
1738  // Pass in void pointer and size of region as arguments to runtime
1739  // function
1740  EmitSanitizerDtorCallback(CGF, VTablePtr, PoisonSize);
1741  }
1742  };
1743 } // end anonymous namespace
1744 
1745 /// Emit all code that comes at the end of class's
1746 /// destructor. This is to call destructors on members and base classes
1747 /// in reverse order of their construction.
1748 ///
1749 /// For a deleting destructor, this also handles the case where a destroying
1750 /// operator delete completely overrides the definition.
1752  CXXDtorType DtorType) {
1753  assert((!DD->isTrivial() || DD->hasAttr<DLLExportAttr>()) &&
1754  "Should not emit dtor epilogue for non-exported trivial dtor!");
1755 
1756  // The deleting-destructor phase just needs to call the appropriate
1757  // operator delete that Sema picked up.
1758  if (DtorType == Dtor_Deleting) {
1759  assert(DD->getOperatorDelete() &&
1760  "operator delete missing - EnterDtorCleanups");
1761  if (CXXStructorImplicitParamValue) {
1762  // If there is an implicit param to the deleting dtor, it's a boolean
1763  // telling whether this is a deleting destructor.
1765  EmitConditionalDtorDeleteCall(*this, CXXStructorImplicitParamValue,
1766  /*ReturnAfterDelete*/true);
1767  else
1768  EHStack.pushCleanup<CallDtorDeleteConditional>(
1769  NormalAndEHCleanup, CXXStructorImplicitParamValue);
1770  } else {
1772  const CXXRecordDecl *ClassDecl = DD->getParent();
1773  EmitDeleteCall(DD->getOperatorDelete(),
1774  LoadThisForDtorDelete(*this, DD),
1775  getContext().getTagDeclType(ClassDecl));
1776  EmitBranchThroughCleanup(ReturnBlock);
1777  } else {
1778  EHStack.pushCleanup<CallDtorDelete>(NormalAndEHCleanup);
1779  }
1780  }
1781  return;
1782  }
1783 
1784  const CXXRecordDecl *ClassDecl = DD->getParent();
1785 
1786  // Unions have no bases and do not call field destructors.
1787  if (ClassDecl->isUnion())
1788  return;
1789 
1790  // The complete-destructor phase just destructs all the virtual bases.
1791  if (DtorType == Dtor_Complete) {
1792  // Poison the vtable pointer such that access after the base
1793  // and member destructors are invoked is invalid.
1794  if (CGM.getCodeGenOpts().SanitizeMemoryUseAfterDtor &&
1795  SanOpts.has(SanitizerKind::Memory) && ClassDecl->getNumVBases() &&
1796  ClassDecl->isPolymorphic())
1797  EHStack.pushCleanup<SanitizeDtorVTable>(NormalAndEHCleanup, DD);
1798 
1799  // We push them in the forward order so that they'll be popped in
1800  // the reverse order.
1801  for (const auto &Base : ClassDecl->vbases()) {
1802  CXXRecordDecl *BaseClassDecl
1803  = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
1804 
1805  // Ignore trivial destructors.
1806  if (BaseClassDecl->hasTrivialDestructor())
1807  continue;
1808 
1809  EHStack.pushCleanup<CallBaseDtor>(NormalAndEHCleanup,
1810  BaseClassDecl,
1811  /*BaseIsVirtual*/ true);
1812  }
1813 
1814  return;
1815  }
1816 
1817  assert(DtorType == Dtor_Base);
1818  // Poison the vtable pointer if it has no virtual bases, but inherits
1819  // virtual functions.
1820  if (CGM.getCodeGenOpts().SanitizeMemoryUseAfterDtor &&
1821  SanOpts.has(SanitizerKind::Memory) && !ClassDecl->getNumVBases() &&
1822  ClassDecl->isPolymorphic())
1823  EHStack.pushCleanup<SanitizeDtorVTable>(NormalAndEHCleanup, DD);
1824 
1825  // Destroy non-virtual bases.
1826  for (const auto &Base : ClassDecl->bases()) {
1827  // Ignore virtual bases.
1828  if (Base.isVirtual())
1829  continue;
1830 
1831  CXXRecordDecl *BaseClassDecl = Base.getType()->getAsCXXRecordDecl();
1832 
1833  // Ignore trivial destructors.
1834  if (BaseClassDecl->hasTrivialDestructor())
1835  continue;
1836 
1837  EHStack.pushCleanup<CallBaseDtor>(NormalAndEHCleanup,
1838  BaseClassDecl,
1839  /*BaseIsVirtual*/ false);
1840  }
1841 
1842  // Poison fields such that access after their destructors are
1843  // invoked, and before the base class destructor runs, is invalid.
1844  if (CGM.getCodeGenOpts().SanitizeMemoryUseAfterDtor &&
1845  SanOpts.has(SanitizerKind::Memory))
1846  EHStack.pushCleanup<SanitizeDtorMembers>(NormalAndEHCleanup, DD);
1847 
1848  // Destroy direct fields.
1849  for (const auto *Field : ClassDecl->fields()) {
1850  QualType type = Field->getType();
1851  QualType::DestructionKind dtorKind = type.isDestructedType();
1852  if (!dtorKind) continue;
1853 
1854  // Anonymous union members do not have their destructors called.
1855  const RecordType *RT = type->getAsUnionType();
1856  if (RT && RT->getDecl()->isAnonymousStructOrUnion()) continue;
1857 
1858  CleanupKind cleanupKind = getCleanupKind(dtorKind);
1859  EHStack.pushCleanup<DestroyField>(cleanupKind, Field,
1860  getDestroyer(dtorKind),
1861  cleanupKind & EHCleanup);
1862  }
1863 }
1864 
1865 /// EmitCXXAggrConstructorCall - Emit a loop to call a particular
1866 /// constructor for each of several members of an array.
1867 ///
1868 /// \param ctor the constructor to call for each element
1869 /// \param arrayType the type of the array to initialize
1870 /// \param arrayBegin an arrayType*
1871 /// \param zeroInitialize true if each element should be
1872 /// zero-initialized before it is constructed
1874  const CXXConstructorDecl *ctor, const ArrayType *arrayType,
1875  Address arrayBegin, const CXXConstructExpr *E, bool NewPointerIsChecked,
1876  bool zeroInitialize) {
1877  QualType elementType;
1878  llvm::Value *numElements =
1879  emitArrayLength(arrayType, elementType, arrayBegin);
1880 
1881  EmitCXXAggrConstructorCall(ctor, numElements, arrayBegin, E,
1882  NewPointerIsChecked, zeroInitialize);
1883 }
1884 
1885 /// EmitCXXAggrConstructorCall - Emit a loop to call a particular
1886 /// constructor for each of several members of an array.
1887 ///
1888 /// \param ctor the constructor to call for each element
1889 /// \param numElements the number of elements in the array;
1890 /// may be zero
1891 /// \param arrayBase a T*, where T is the type constructed by ctor
1892 /// \param zeroInitialize true if each element should be
1893 /// zero-initialized before it is constructed
1895  llvm::Value *numElements,
1896  Address arrayBase,
1897  const CXXConstructExpr *E,
1898  bool NewPointerIsChecked,
1899  bool zeroInitialize) {
1900  // It's legal for numElements to be zero. This can happen both
1901  // dynamically, because x can be zero in 'new A[x]', and statically,
1902  // because of GCC extensions that permit zero-length arrays. There
1903  // are probably legitimate places where we could assume that this
1904  // doesn't happen, but it's not clear that it's worth it.
1905  llvm::BranchInst *zeroCheckBranch = nullptr;
1906 
1907  // Optimize for a constant count.
1908  llvm::ConstantInt *constantCount
1909  = dyn_cast<llvm::ConstantInt>(numElements);
1910  if (constantCount) {
1911  // Just skip out if the constant count is zero.
1912  if (constantCount->isZero()) return;
1913 
1914  // Otherwise, emit the check.
1915  } else {
1916  llvm::BasicBlock *loopBB = createBasicBlock("new.ctorloop");
1917  llvm::Value *iszero = Builder.CreateIsNull(numElements, "isempty");
1918  zeroCheckBranch = Builder.CreateCondBr(iszero, loopBB, loopBB);
1919  EmitBlock(loopBB);
1920  }
1921 
1922  // Find the end of the array.
1923  llvm::Value *arrayBegin = arrayBase.getPointer();
1924  llvm::Value *arrayEnd = Builder.CreateInBoundsGEP(arrayBegin, numElements,
1925  "arrayctor.end");
1926 
1927  // Enter the loop, setting up a phi for the current location to initialize.
1928  llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1929  llvm::BasicBlock *loopBB = createBasicBlock("arrayctor.loop");
1930  EmitBlock(loopBB);
1931  llvm::PHINode *cur = Builder.CreatePHI(arrayBegin->getType(), 2,
1932  "arrayctor.cur");
1933  cur->addIncoming(arrayBegin, entryBB);
1934 
1935  // Inside the loop body, emit the constructor call on the array element.
1936 
1937  // The alignment of the base, adjusted by the size of a single element,
1938  // provides a conservative estimate of the alignment of every element.
1939  // (This assumes we never start tracking offsetted alignments.)
1940  //
1941  // Note that these are complete objects and so we don't need to
1942  // use the non-virtual size or alignment.
1944  CharUnits eltAlignment =
1945  arrayBase.getAlignment()
1946  .alignmentOfArrayElement(getContext().getTypeSizeInChars(type));
1947  Address curAddr = Address(cur, eltAlignment);
1948 
1949  // Zero initialize the storage, if requested.
1950  if (zeroInitialize)
1951  EmitNullInitialization(curAddr, type);
1952 
1953  // C++ [class.temporary]p4:
1954  // There are two contexts in which temporaries are destroyed at a different
1955  // point than the end of the full-expression. The first context is when a
1956  // default constructor is called to initialize an element of an array.
1957  // If the constructor has one or more default arguments, the destruction of
1958  // every temporary created in a default argument expression is sequenced
1959  // before the construction of the next array element, if any.
1960 
1961  {
1962  RunCleanupsScope Scope(*this);
1963 
1964  // Evaluate the constructor and its arguments in a regular
1965  // partial-destroy cleanup.
1966  if (getLangOpts().Exceptions &&
1967  !ctor->getParent()->hasTrivialDestructor()) {
1968  Destroyer *destroyer = destroyCXXObject;
1969  pushRegularPartialArrayCleanup(arrayBegin, cur, type, eltAlignment,
1970  *destroyer);
1971  }
1972 
1973  EmitCXXConstructorCall(ctor, Ctor_Complete, /*ForVirtualBase=*/false,
1974  /*Delegating=*/false, curAddr, E,
1975  AggValueSlot::DoesNotOverlap, NewPointerIsChecked);
1976  }
1977 
1978  // Go to the next element.
1979  llvm::Value *next =
1980  Builder.CreateInBoundsGEP(cur, llvm::ConstantInt::get(SizeTy, 1),
1981  "arrayctor.next");
1982  cur->addIncoming(next, Builder.GetInsertBlock());
1983 
1984  // Check whether that's the end of the loop.
1985  llvm::Value *done = Builder.CreateICmpEQ(next, arrayEnd, "arrayctor.done");
1986  llvm::BasicBlock *contBB = createBasicBlock("arrayctor.cont");
1987  Builder.CreateCondBr(done, contBB, loopBB);
1988 
1989  // Patch the earlier check to skip over the loop.
1990  if (zeroCheckBranch) zeroCheckBranch->setSuccessor(0, contBB);
1991 
1992  EmitBlock(contBB);
1993 }
1994 
1996  Address addr,
1997  QualType type) {
1998  const RecordType *rtype = type->castAs<RecordType>();
1999  const CXXRecordDecl *record = cast<CXXRecordDecl>(rtype->getDecl());
2000  const CXXDestructorDecl *dtor = record->getDestructor();
2001  assert(!dtor->isTrivial());
2002  CGF.EmitCXXDestructorCall(dtor, Dtor_Complete, /*for vbase*/ false,
2003  /*Delegating=*/false, addr);
2004 }
2005 
2007  CXXCtorType Type,
2008  bool ForVirtualBase,
2009  bool Delegating, Address This,
2010  const CXXConstructExpr *E,
2011  AggValueSlot::Overlap_t Overlap,
2012  bool NewPointerIsChecked) {
2013  CallArgList Args;
2014 
2015  // Push the this ptr.
2016  Args.add(RValue::get(This.getPointer()), D->getThisType(getContext()));
2017 
2018  // If this is a trivial constructor, emit a memcpy now before we lose
2019  // the alignment information on the argument.
2020  // FIXME: It would be better to preserve alignment information into CallArg.
2022  assert(E->getNumArgs() == 1 && "unexpected argcount for trivial ctor");
2023 
2024  const Expr *Arg = E->getArg(0);
2025  LValue Src = EmitLValue(Arg);
2026  QualType DestTy = getContext().getTypeDeclType(D->getParent());
2027  LValue Dest = MakeAddrLValue(This, DestTy);
2028  EmitAggregateCopyCtor(Dest, Src, Overlap);
2029  return;
2030  }
2031 
2032  // Add the rest of the user-supplied arguments.
2033  const FunctionProtoType *FPT = D->getType()->castAs<FunctionProtoType>();
2035  ? EvaluationOrder::ForceLeftToRight
2037  EmitCallArgs(Args, FPT, E->arguments(), E->getConstructor(),
2038  /*ParamsToSkip*/ 0, Order);
2039 
2040  EmitCXXConstructorCall(D, Type, ForVirtualBase, Delegating, This, Args,
2041  Overlap, E->getExprLoc(), NewPointerIsChecked);
2042 }
2043 
2045  const CXXConstructorDecl *Ctor,
2046  CXXCtorType Type, CallArgList &Args) {
2047  // We can't forward a variadic call.
2048  if (Ctor->isVariadic())
2049  return false;
2050 
2052  // If the parameters are callee-cleanup, it's not safe to forward.
2053  for (auto *P : Ctor->parameters())
2054  if (P->getType().isDestructedType())
2055  return false;
2056 
2057  // Likewise if they're inalloca.
2058  const CGFunctionInfo &Info =
2059  CGF.CGM.getTypes().arrangeCXXConstructorCall(Args, Ctor, Type, 0, 0);
2060  if (Info.usesInAlloca())
2061  return false;
2062  }
2063 
2064  // Anything else should be OK.
2065  return true;
2066 }
2067 
2069  CXXCtorType Type,
2070  bool ForVirtualBase,
2071  bool Delegating,
2072  Address This,
2073  CallArgList &Args,
2074  AggValueSlot::Overlap_t Overlap,
2075  SourceLocation Loc,
2076  bool NewPointerIsChecked) {
2077  const CXXRecordDecl *ClassDecl = D->getParent();
2078 
2079  if (!NewPointerIsChecked)
2080  EmitTypeCheck(CodeGenFunction::TCK_ConstructorCall, Loc, This.getPointer(),
2081  getContext().getRecordType(ClassDecl), CharUnits::Zero());
2082 
2083  if (D->isTrivial() && D->isDefaultConstructor()) {
2084  assert(Args.size() == 1 && "trivial default ctor with args");
2085  return;
2086  }
2087 
2088  // If this is a trivial constructor, just emit what's needed. If this is a
2089  // union copy constructor, we must emit a memcpy, because the AST does not
2090  // model that copy.
2092  assert(Args.size() == 2 && "unexpected argcount for trivial ctor");
2093 
2094  QualType SrcTy = D->getParamDecl(0)->getType().getNonReferenceType();
2095  Address Src(Args[1].getRValue(*this).getScalarVal(),
2096  getNaturalTypeAlignment(SrcTy));
2097  LValue SrcLVal = MakeAddrLValue(Src, SrcTy);
2098  QualType DestTy = getContext().getTypeDeclType(ClassDecl);
2099  LValue DestLVal = MakeAddrLValue(This, DestTy);
2100  EmitAggregateCopyCtor(DestLVal, SrcLVal, Overlap);
2101  return;
2102  }
2103 
2104  bool PassPrototypeArgs = true;
2105  // Check whether we can actually emit the constructor before trying to do so.
2106  if (auto Inherited = D->getInheritedConstructor()) {
2107  PassPrototypeArgs = getTypes().inheritingCtorHasParams(Inherited, Type);
2108  if (PassPrototypeArgs && !canEmitDelegateCallArgs(*this, D, Type, Args)) {
2109  EmitInlinedInheritingCXXConstructorCall(D, Type, ForVirtualBase,
2110  Delegating, Args);
2111  return;
2112  }
2113  }
2114 
2115  // Insert any ABI-specific implicit constructor arguments.
2116  CGCXXABI::AddedStructorArgs ExtraArgs =
2117  CGM.getCXXABI().addImplicitConstructorArgs(*this, D, Type, ForVirtualBase,
2118  Delegating, Args);
2119 
2120  // Emit the call.
2121  llvm::Constant *CalleePtr =
2122  CGM.getAddrOfCXXStructor(D, getFromCtorType(Type));
2123  const CGFunctionInfo &Info = CGM.getTypes().arrangeCXXConstructorCall(
2124  Args, D, Type, ExtraArgs.Prefix, ExtraArgs.Suffix, PassPrototypeArgs);
2125  CGCallee Callee = CGCallee::forDirect(CalleePtr, D);
2126  EmitCall(Info, Callee, ReturnValueSlot(), Args);
2127 
2128  // Generate vtable assumptions if we're constructing a complete object
2129  // with a vtable. We don't do this for base subobjects for two reasons:
2130  // first, it's incorrect for classes with virtual bases, and second, we're
2131  // about to overwrite the vptrs anyway.
2132  // We also have to make sure if we can refer to vtable:
2133  // - Otherwise we can refer to vtable if it's safe to speculatively emit.
2134  // FIXME: If vtable is used by ctor/dtor, or if vtable is external and we are
2135  // sure that definition of vtable is not hidden,
2136  // then we are always safe to refer to it.
2137  // FIXME: It looks like InstCombine is very inefficient on dealing with
2138  // assumes. Make assumption loads require -fstrict-vtable-pointers temporarily.
2139  if (CGM.getCodeGenOpts().OptimizationLevel > 0 &&
2140  ClassDecl->isDynamicClass() && Type != Ctor_Base &&
2141  CGM.getCXXABI().canSpeculativelyEmitVTable(ClassDecl) &&
2142  CGM.getCodeGenOpts().StrictVTablePointers)
2143  EmitVTableAssumptionLoads(ClassDecl, This);
2144 }
2145 
2147  const CXXConstructorDecl *D, bool ForVirtualBase, Address This,
2148  bool InheritedFromVBase, const CXXInheritedCtorInitExpr *E) {
2149  CallArgList Args;
2150  CallArg ThisArg(RValue::get(This.getPointer()), D->getThisType(getContext()));
2151 
2152  // Forward the parameters.
2153  if (InheritedFromVBase &&
2154  CGM.getTarget().getCXXABI().hasConstructorVariants()) {
2155  // Nothing to do; this construction is not responsible for constructing
2156  // the base class containing the inherited constructor.
2157  // FIXME: Can we just pass undef's for the remaining arguments if we don't
2158  // have constructor variants?
2159  Args.push_back(ThisArg);
2160  } else if (!CXXInheritedCtorInitExprArgs.empty()) {
2161  // The inheriting constructor was inlined; just inject its arguments.
2162  assert(CXXInheritedCtorInitExprArgs.size() >= D->getNumParams() &&
2163  "wrong number of parameters for inherited constructor call");
2164  Args = CXXInheritedCtorInitExprArgs;
2165  Args[0] = ThisArg;
2166  } else {
2167  // The inheriting constructor was not inlined. Emit delegating arguments.
2168  Args.push_back(ThisArg);
2169  const auto *OuterCtor = cast<CXXConstructorDecl>(CurCodeDecl);
2170  assert(OuterCtor->getNumParams() == D->getNumParams());
2171  assert(!OuterCtor->isVariadic() && "should have been inlined");
2172 
2173  for (const auto *Param : OuterCtor->parameters()) {
2174  assert(getContext().hasSameUnqualifiedType(
2175  OuterCtor->getParamDecl(Param->getFunctionScopeIndex())->getType(),
2176  Param->getType()));
2177  EmitDelegateCallArg(Args, Param, E->getLocation());
2178 
2179  // Forward __attribute__(pass_object_size).
2180  if (Param->hasAttr<PassObjectSizeAttr>()) {
2181  auto *POSParam = SizeArguments[Param];
2182  assert(POSParam && "missing pass_object_size value for forwarding");
2183  EmitDelegateCallArg(Args, POSParam, E->getLocation());
2184  }
2185  }
2186  }
2187 
2188  EmitCXXConstructorCall(D, Ctor_Base, ForVirtualBase, /*Delegating*/false,
2189  This, Args, AggValueSlot::MayOverlap,
2190  E->getLocation(), /*NewPointerIsChecked*/true);
2191 }
2192 
2194  const CXXConstructorDecl *Ctor, CXXCtorType CtorType, bool ForVirtualBase,
2195  bool Delegating, CallArgList &Args) {
2196  GlobalDecl GD(Ctor, CtorType);
2198  ApplyInlineDebugLocation DebugScope(*this, GD);
2199 
2200  // Save the arguments to be passed to the inherited constructor.
2201  CXXInheritedCtorInitExprArgs = Args;
2202 
2203  FunctionArgList Params;
2204  QualType RetType = BuildFunctionArgList(CurGD, Params);
2205  FnRetTy = RetType;
2206 
2207  // Insert any ABI-specific implicit constructor arguments.
2208  CGM.getCXXABI().addImplicitConstructorArgs(*this, Ctor, CtorType,
2209  ForVirtualBase, Delegating, Args);
2210 
2211  // Emit a simplified prolog. We only need to emit the implicit params.
2212  assert(Args.size() >= Params.size() && "too few arguments for call");
2213  for (unsigned I = 0, N = Args.size(); I != N; ++I) {
2214  if (I < Params.size() && isa<ImplicitParamDecl>(Params[I])) {
2215  const RValue &RV = Args[I].getRValue(*this);
2216  assert(!RV.isComplex() && "complex indirect params not supported");
2217  ParamValue Val = RV.isScalar()
2218  ? ParamValue::forDirect(RV.getScalarVal())
2219  : ParamValue::forIndirect(RV.getAggregateAddress());
2220  EmitParmDecl(*Params[I], Val, I + 1);
2221  }
2222  }
2223 
2224  // Create a return value slot if the ABI implementation wants one.
2225  // FIXME: This is dumb, we should ask the ABI not to try to set the return
2226  // value instead.
2227  if (!RetType->isVoidType())
2228  ReturnValue = CreateIRTemp(RetType, "retval.inhctor");
2229 
2230  CGM.getCXXABI().EmitInstanceFunctionProlog(*this);
2231  CXXThisValue = CXXABIThisValue;
2232 
2233  // Directly emit the constructor initializers.
2234  EmitCtorPrologue(Ctor, CtorType, Params);
2235 }
2236 
2238  llvm::Value *VTableGlobal =
2239  CGM.getCXXABI().getVTableAddressPoint(Vptr.Base, Vptr.VTableClass);
2240  if (!VTableGlobal)
2241  return;
2242 
2243  // We can just use the base offset in the complete class.
2244  CharUnits NonVirtualOffset = Vptr.Base.getBaseOffset();
2245 
2246  if (!NonVirtualOffset.isZero())
2247  This =
2248  ApplyNonVirtualAndVirtualOffset(*this, This, NonVirtualOffset, nullptr,
2249  Vptr.VTableClass, Vptr.NearestVBase);
2250 
2251  llvm::Value *VPtrValue =
2252  GetVTablePtr(This, VTableGlobal->getType(), Vptr.VTableClass);
2253  llvm::Value *Cmp =
2254  Builder.CreateICmpEQ(VPtrValue, VTableGlobal, "cmp.vtables");
2255  Builder.CreateAssumption(Cmp);
2256 }
2257 
2259  Address This) {
2260  if (CGM.getCXXABI().doStructorsInitializeVPtrs(ClassDecl))
2261  for (const VPtr &Vptr : getVTablePointers(ClassDecl))
2262  EmitVTableAssumptionLoad(Vptr, This);
2263 }
2264 
2265 void
2267  Address This, Address Src,
2268  const CXXConstructExpr *E) {
2269  const FunctionProtoType *FPT = D->getType()->castAs<FunctionProtoType>();
2270 
2271  CallArgList Args;
2272 
2273  // Push the this ptr.
2274  Args.add(RValue::get(This.getPointer()), D->getThisType(getContext()));
2275 
2276  // Push the src ptr.
2277  QualType QT = *(FPT->param_type_begin());
2278  llvm::Type *t = CGM.getTypes().ConvertType(QT);
2279  Src = Builder.CreateBitCast(Src, t);
2280  Args.add(RValue::get(Src.getPointer()), QT);
2281 
2282  // Skip over first argument (Src).
2283  EmitCallArgs(Args, FPT, drop_begin(E->arguments(), 1), E->getConstructor(),
2284  /*ParamsToSkip*/ 1);
2285 
2286  EmitCXXConstructorCall(D, Ctor_Complete, /*ForVirtualBase*/false,
2287  /*Delegating*/false, This, Args,
2289  /*NewPointerIsChecked*/false);
2290 }
2291 
2292 void
2294  CXXCtorType CtorType,
2295  const FunctionArgList &Args,
2296  SourceLocation Loc) {
2297  CallArgList DelegateArgs;
2298 
2299  FunctionArgList::const_iterator I = Args.begin(), E = Args.end();
2300  assert(I != E && "no parameters to constructor");
2301 
2302  // this
2303  Address This = LoadCXXThisAddress();
2304  DelegateArgs.add(RValue::get(This.getPointer()), (*I)->getType());
2305  ++I;
2306 
2307  // FIXME: The location of the VTT parameter in the parameter list is
2308  // specific to the Itanium ABI and shouldn't be hardcoded here.
2309  if (CGM.getCXXABI().NeedsVTTParameter(CurGD)) {
2310  assert(I != E && "cannot skip vtt parameter, already done with args");
2311  assert((*I)->getType()->isPointerType() &&
2312  "skipping parameter not of vtt type");
2313  ++I;
2314  }
2315 
2316  // Explicit arguments.
2317  for (; I != E; ++I) {
2318  const VarDecl *param = *I;
2319  // FIXME: per-argument source location
2320  EmitDelegateCallArg(DelegateArgs, param, Loc);
2321  }
2322 
2323  EmitCXXConstructorCall(Ctor, CtorType, /*ForVirtualBase=*/false,
2324  /*Delegating=*/true, This, DelegateArgs,
2326  /*NewPointerIsChecked=*/true);
2327 }
2328 
2329 namespace {
2330  struct CallDelegatingCtorDtor final : EHScopeStack::Cleanup {
2331  const CXXDestructorDecl *Dtor;
2332  Address Addr;
2333  CXXDtorType Type;
2334 
2335  CallDelegatingCtorDtor(const CXXDestructorDecl *D, Address Addr,
2336  CXXDtorType Type)
2337  : Dtor(D), Addr(Addr), Type(Type) {}
2338 
2339  void Emit(CodeGenFunction &CGF, Flags flags) override {
2340  CGF.EmitCXXDestructorCall(Dtor, Type, /*ForVirtualBase=*/false,
2341  /*Delegating=*/true, Addr);
2342  }
2343  };
2344 } // end anonymous namespace
2345 
2346 void
2348  const FunctionArgList &Args) {
2349  assert(Ctor->isDelegatingConstructor());
2350 
2351  Address ThisPtr = LoadCXXThisAddress();
2352 
2353  AggValueSlot AggSlot =
2354  AggValueSlot::forAddr(ThisPtr, Qualifiers(),
2360  // Checks are made by the code that calls constructor.
2362 
2363  EmitAggExpr(Ctor->init_begin()[0]->getInit(), AggSlot);
2364 
2365  const CXXRecordDecl *ClassDecl = Ctor->getParent();
2366  if (CGM.getLangOpts().Exceptions && !ClassDecl->hasTrivialDestructor()) {
2367  CXXDtorType Type =
2368  CurGD.getCtorType() == Ctor_Complete ? Dtor_Complete : Dtor_Base;
2369 
2370  EHStack.pushCleanup<CallDelegatingCtorDtor>(EHCleanup,
2371  ClassDecl->getDestructor(),
2372  ThisPtr, Type);
2373  }
2374 }
2375 
2377  CXXDtorType Type,
2378  bool ForVirtualBase,
2379  bool Delegating,
2380  Address This) {
2381  CGM.getCXXABI().EmitDestructorCall(*this, DD, Type, ForVirtualBase,
2382  Delegating, This);
2383 }
2384 
2385 namespace {
2386  struct CallLocalDtor final : EHScopeStack::Cleanup {
2387  const CXXDestructorDecl *Dtor;
2388  Address Addr;
2389 
2390  CallLocalDtor(const CXXDestructorDecl *D, Address Addr)
2391  : Dtor(D), Addr(Addr) {}
2392 
2393  void Emit(CodeGenFunction &CGF, Flags flags) override {
2395  /*ForVirtualBase=*/false,
2396  /*Delegating=*/false, Addr);
2397  }
2398  };
2399 } // end anonymous namespace
2400 
2402  Address Addr) {
2403  EHStack.pushCleanup<CallLocalDtor>(NormalAndEHCleanup, D, Addr);
2404 }
2405 
2407  CXXRecordDecl *ClassDecl = T->getAsCXXRecordDecl();
2408  if (!ClassDecl) return;
2409  if (ClassDecl->hasTrivialDestructor()) return;
2410 
2411  const CXXDestructorDecl *D = ClassDecl->getDestructor();
2412  assert(D && D->isUsed() && "destructor not marked as used!");
2413  PushDestructorCleanup(D, Addr);
2414 }
2415 
2417  // Compute the address point.
2418  llvm::Value *VTableAddressPoint =
2419  CGM.getCXXABI().getVTableAddressPointInStructor(
2420  *this, Vptr.VTableClass, Vptr.Base, Vptr.NearestVBase);
2421 
2422  if (!VTableAddressPoint)
2423  return;
2424 
2425  // Compute where to store the address point.
2426  llvm::Value *VirtualOffset = nullptr;
2427  CharUnits NonVirtualOffset = CharUnits::Zero();
2428 
2429  if (CGM.getCXXABI().isVirtualOffsetNeededForVTableField(*this, Vptr)) {
2430  // We need to use the virtual base offset offset because the virtual base
2431  // might have a different offset in the most derived class.
2432 
2433  VirtualOffset = CGM.getCXXABI().GetVirtualBaseClassOffset(
2434  *this, LoadCXXThisAddress(), Vptr.VTableClass, Vptr.NearestVBase);
2435  NonVirtualOffset = Vptr.OffsetFromNearestVBase;
2436  } else {
2437  // We can just use the base offset in the complete class.
2438  NonVirtualOffset = Vptr.Base.getBaseOffset();
2439  }
2440 
2441  // Apply the offsets.
2442  Address VTableField = LoadCXXThisAddress();
2443 
2444  if (!NonVirtualOffset.isZero() || VirtualOffset)
2445  VTableField = ApplyNonVirtualAndVirtualOffset(
2446  *this, VTableField, NonVirtualOffset, VirtualOffset, Vptr.VTableClass,
2447  Vptr.NearestVBase);
2448 
2449  // Finally, store the address point. Use the same LLVM types as the field to
2450  // support optimization.
2451  llvm::Type *VTablePtrTy =
2452  llvm::FunctionType::get(CGM.Int32Ty, /*isVarArg=*/true)
2453  ->getPointerTo()
2454  ->getPointerTo();
2455  VTableField = Builder.CreateBitCast(VTableField, VTablePtrTy->getPointerTo());
2456  VTableAddressPoint = Builder.CreateBitCast(VTableAddressPoint, VTablePtrTy);
2457 
2458  llvm::StoreInst *Store = Builder.CreateStore(VTableAddressPoint, VTableField);
2459  TBAAAccessInfo TBAAInfo = CGM.getTBAAVTablePtrAccessInfo(VTablePtrTy);
2460  CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
2461  if (CGM.getCodeGenOpts().OptimizationLevel > 0 &&
2462  CGM.getCodeGenOpts().StrictVTablePointers)
2463  CGM.DecorateInstructionWithInvariantGroup(Store, Vptr.VTableClass);
2464 }
2465 
2468  CodeGenFunction::VPtrsVector VPtrsResult;
2469  VisitedVirtualBasesSetTy VBases;
2470  getVTablePointers(BaseSubobject(VTableClass, CharUnits::Zero()),
2471  /*NearestVBase=*/nullptr,
2472  /*OffsetFromNearestVBase=*/CharUnits::Zero(),
2473  /*BaseIsNonVirtualPrimaryBase=*/false, VTableClass, VBases,
2474  VPtrsResult);
2475  return VPtrsResult;
2476 }
2477 
2479  const CXXRecordDecl *NearestVBase,
2480  CharUnits OffsetFromNearestVBase,
2481  bool BaseIsNonVirtualPrimaryBase,
2482  const CXXRecordDecl *VTableClass,
2483  VisitedVirtualBasesSetTy &VBases,
2484  VPtrsVector &Vptrs) {
2485  // If this base is a non-virtual primary base the address point has already
2486  // been set.
2487  if (!BaseIsNonVirtualPrimaryBase) {
2488  // Initialize the vtable pointer for this base.
2489  VPtr Vptr = {Base, NearestVBase, OffsetFromNearestVBase, VTableClass};
2490  Vptrs.push_back(Vptr);
2491  }
2492 
2493  const CXXRecordDecl *RD = Base.getBase();
2494 
2495  // Traverse bases.
2496  for (const auto &I : RD->bases()) {
2497  CXXRecordDecl *BaseDecl
2498  = cast<CXXRecordDecl>(I.getType()->getAs<RecordType>()->getDecl());
2499 
2500  // Ignore classes without a vtable.
2501  if (!BaseDecl->isDynamicClass())
2502  continue;
2503 
2504  CharUnits BaseOffset;
2505  CharUnits BaseOffsetFromNearestVBase;
2506  bool BaseDeclIsNonVirtualPrimaryBase;
2507 
2508  if (I.isVirtual()) {
2509  // Check if we've visited this virtual base before.
2510  if (!VBases.insert(BaseDecl).second)
2511  continue;
2512 
2513  const ASTRecordLayout &Layout =
2514  getContext().getASTRecordLayout(VTableClass);
2515 
2516  BaseOffset = Layout.getVBaseClassOffset(BaseDecl);
2517  BaseOffsetFromNearestVBase = CharUnits::Zero();
2518  BaseDeclIsNonVirtualPrimaryBase = false;
2519  } else {
2520  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
2521 
2522  BaseOffset = Base.getBaseOffset() + Layout.getBaseClassOffset(BaseDecl);
2523  BaseOffsetFromNearestVBase =
2524  OffsetFromNearestVBase + Layout.getBaseClassOffset(BaseDecl);
2525  BaseDeclIsNonVirtualPrimaryBase = Layout.getPrimaryBase() == BaseDecl;
2526  }
2527 
2528  getVTablePointers(
2529  BaseSubobject(BaseDecl, BaseOffset),
2530  I.isVirtual() ? BaseDecl : NearestVBase, BaseOffsetFromNearestVBase,
2531  BaseDeclIsNonVirtualPrimaryBase, VTableClass, VBases, Vptrs);
2532  }
2533 }
2534 
2536  // Ignore classes without a vtable.
2537  if (!RD->isDynamicClass())
2538  return;
2539 
2540  // Initialize the vtable pointers for this class and all of its bases.
2541  if (CGM.getCXXABI().doStructorsInitializeVPtrs(RD))
2542  for (const VPtr &Vptr : getVTablePointers(RD))
2543  InitializeVTablePointer(Vptr);
2544 
2545  if (RD->getNumVBases())
2546  CGM.getCXXABI().initializeHiddenVirtualInheritanceMembers(*this, RD);
2547 }
2548 
2550  llvm::Type *VTableTy,
2551  const CXXRecordDecl *RD) {
2552  Address VTablePtrSrc = Builder.CreateElementBitCast(This, VTableTy);
2553  llvm::Instruction *VTable = Builder.CreateLoad(VTablePtrSrc, "vtable");
2554  TBAAAccessInfo TBAAInfo = CGM.getTBAAVTablePtrAccessInfo(VTableTy);
2555  CGM.DecorateInstructionWithTBAA(VTable, TBAAInfo);
2556 
2557  if (CGM.getCodeGenOpts().OptimizationLevel > 0 &&
2558  CGM.getCodeGenOpts().StrictVTablePointers)
2559  CGM.DecorateInstructionWithInvariantGroup(VTable, RD);
2560 
2561  return VTable;
2562 }
2563 
2564 // If a class has a single non-virtual base and does not introduce or override
2565 // virtual member functions or fields, it will have the same layout as its base.
2566 // This function returns the least derived such class.
2567 //
2568 // Casting an instance of a base class to such a derived class is technically
2569 // undefined behavior, but it is a relatively common hack for introducing member
2570 // functions on class instances with specific properties (e.g. llvm::Operator)
2571 // that works under most compilers and should not have security implications, so
2572 // we allow it by default. It can be disabled with -fsanitize=cfi-cast-strict.
2573 static const CXXRecordDecl *
2575  if (!RD->field_empty())
2576  return RD;
2577 
2578  if (RD->getNumVBases() != 0)
2579  return RD;
2580 
2581  if (RD->getNumBases() != 1)
2582  return RD;
2583 
2584  for (const CXXMethodDecl *MD : RD->methods()) {
2585  if (MD->isVirtual()) {
2586  // Virtual member functions are only ok if they are implicit destructors
2587  // because the implicit destructor will have the same semantics as the
2588  // base class's destructor if no fields are added.
2589  if (isa<CXXDestructorDecl>(MD) && MD->isImplicit())
2590  continue;
2591  return RD;
2592  }
2593  }
2594 
2596  RD->bases_begin()->getType()->getAsCXXRecordDecl());
2597 }
2598 
2600  llvm::Value *VTable,
2601  SourceLocation Loc) {
2602  if (SanOpts.has(SanitizerKind::CFIVCall))
2603  EmitVTablePtrCheckForCall(RD, VTable, CodeGenFunction::CFITCK_VCall, Loc);
2604  else if (CGM.getCodeGenOpts().WholeProgramVTables &&
2605  CGM.HasHiddenLTOVisibility(RD)) {
2606  llvm::Metadata *MD =
2607  CGM.CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
2608  llvm::Value *TypeId =
2609  llvm::MetadataAsValue::get(CGM.getLLVMContext(), MD);
2610 
2611  llvm::Value *CastedVTable = Builder.CreateBitCast(VTable, Int8PtrTy);
2612  llvm::Value *TypeTest =
2613  Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
2614  {CastedVTable, TypeId});
2615  Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::assume), TypeTest);
2616  }
2617 }
2618 
2620  llvm::Value *VTable,
2621  CFITypeCheckKind TCK,
2622  SourceLocation Loc) {
2623  if (!SanOpts.has(SanitizerKind::CFICastStrict))
2625 
2626  EmitVTablePtrCheck(RD, VTable, TCK, Loc);
2627 }
2628 
2630  llvm::Value *Derived,
2631  bool MayBeNull,
2632  CFITypeCheckKind TCK,
2633  SourceLocation Loc) {
2634  if (!getLangOpts().CPlusPlus)
2635  return;
2636 
2637  auto *ClassTy = T->getAs<RecordType>();
2638  if (!ClassTy)
2639  return;
2640 
2641  const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassTy->getDecl());
2642 
2643  if (!ClassDecl->isCompleteDefinition() || !ClassDecl->isDynamicClass())
2644  return;
2645 
2646  if (!SanOpts.has(SanitizerKind::CFICastStrict))
2647  ClassDecl = LeastDerivedClassWithSameLayout(ClassDecl);
2648 
2649  llvm::BasicBlock *ContBlock = nullptr;
2650 
2651  if (MayBeNull) {
2652  llvm::Value *DerivedNotNull =
2653  Builder.CreateIsNotNull(Derived, "cast.nonnull");
2654 
2655  llvm::BasicBlock *CheckBlock = createBasicBlock("cast.check");
2656  ContBlock = createBasicBlock("cast.cont");
2657 
2658  Builder.CreateCondBr(DerivedNotNull, CheckBlock, ContBlock);
2659 
2660  EmitBlock(CheckBlock);
2661  }
2662 
2663  llvm::Value *VTable;
2664  std::tie(VTable, ClassDecl) = CGM.getCXXABI().LoadVTablePtr(
2665  *this, Address(Derived, getPointerAlign()), ClassDecl);
2666 
2667  EmitVTablePtrCheck(ClassDecl, VTable, TCK, Loc);
2668 
2669  if (MayBeNull) {
2670  Builder.CreateBr(ContBlock);
2671  EmitBlock(ContBlock);
2672  }
2673 }
2674 
2676  llvm::Value *VTable,
2677  CFITypeCheckKind TCK,
2678  SourceLocation Loc) {
2679  if (!CGM.getCodeGenOpts().SanitizeCfiCrossDso &&
2680  !CGM.HasHiddenLTOVisibility(RD))
2681  return;
2682 
2683  SanitizerMask M;
2684  llvm::SanitizerStatKind SSK;
2685  switch (TCK) {
2686  case CFITCK_VCall:
2687  M = SanitizerKind::CFIVCall;
2688  SSK = llvm::SanStat_CFI_VCall;
2689  break;
2690  case CFITCK_NVCall:
2691  M = SanitizerKind::CFINVCall;
2692  SSK = llvm::SanStat_CFI_NVCall;
2693  break;
2694  case CFITCK_DerivedCast:
2695  M = SanitizerKind::CFIDerivedCast;
2696  SSK = llvm::SanStat_CFI_DerivedCast;
2697  break;
2698  case CFITCK_UnrelatedCast:
2699  M = SanitizerKind::CFIUnrelatedCast;
2700  SSK = llvm::SanStat_CFI_UnrelatedCast;
2701  break;
2702  case CFITCK_ICall:
2703  case CFITCK_NVMFCall:
2704  case CFITCK_VMFCall:
2705  llvm_unreachable("unexpected sanitizer kind");
2706  }
2707 
2708  std::string TypeName = RD->getQualifiedNameAsString();
2709  if (getContext().getSanitizerBlacklist().isBlacklistedType(M, TypeName))
2710  return;
2711 
2712  SanitizerScope SanScope(this);
2713  EmitSanitizerStatReport(SSK);
2714 
2715  llvm::Metadata *MD =
2716  CGM.CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
2717  llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
2718 
2719  llvm::Value *CastedVTable = Builder.CreateBitCast(VTable, Int8PtrTy);
2720  llvm::Value *TypeTest = Builder.CreateCall(
2721  CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedVTable, TypeId});
2722 
2723  llvm::Constant *StaticData[] = {
2724  llvm::ConstantInt::get(Int8Ty, TCK),
2725  EmitCheckSourceLocation(Loc),
2726  EmitCheckTypeDescriptor(QualType(RD->getTypeForDecl(), 0)),
2727  };
2728 
2729  auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
2730  if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
2731  EmitCfiSlowPathCheck(M, TypeTest, CrossDsoTypeId, CastedVTable, StaticData);
2732  return;
2733  }
2734 
2735  if (CGM.getCodeGenOpts().SanitizeTrap.has(M)) {
2736  EmitTrapCheck(TypeTest);
2737  return;
2738  }
2739 
2740  llvm::Value *AllVtables = llvm::MetadataAsValue::get(
2741  CGM.getLLVMContext(),
2742  llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
2743  llvm::Value *ValidVtable = Builder.CreateCall(
2744  CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedVTable, AllVtables});
2745  EmitCheck(std::make_pair(TypeTest, M), SanitizerHandler::CFICheckFail,
2746  StaticData, {CastedVTable, ValidVtable});
2747 }
2748 
2750  if (!CGM.getCodeGenOpts().WholeProgramVTables ||
2751  !SanOpts.has(SanitizerKind::CFIVCall) ||
2752  !CGM.getCodeGenOpts().SanitizeTrap.has(SanitizerKind::CFIVCall) ||
2753  !CGM.HasHiddenLTOVisibility(RD))
2754  return false;
2755 
2756  std::string TypeName = RD->getQualifiedNameAsString();
2758  SanitizerKind::CFIVCall, TypeName);
2759 }
2760 
2762  const CXXRecordDecl *RD, llvm::Value *VTable, uint64_t VTableByteOffset) {
2763  SanitizerScope SanScope(this);
2764 
2765  EmitSanitizerStatReport(llvm::SanStat_CFI_VCall);
2766 
2767  llvm::Metadata *MD =
2768  CGM.CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
2769  llvm::Value *TypeId = llvm::MetadataAsValue::get(CGM.getLLVMContext(), MD);
2770 
2771  llvm::Value *CastedVTable = Builder.CreateBitCast(VTable, Int8PtrTy);
2772  llvm::Value *CheckedLoad = Builder.CreateCall(
2773  CGM.getIntrinsic(llvm::Intrinsic::type_checked_load),
2774  {CastedVTable, llvm::ConstantInt::get(Int32Ty, VTableByteOffset),
2775  TypeId});
2776  llvm::Value *CheckResult = Builder.CreateExtractValue(CheckedLoad, 1);
2777 
2778  EmitCheck(std::make_pair(CheckResult, SanitizerKind::CFIVCall),
2779  SanitizerHandler::CFICheckFail, nullptr, nullptr);
2780 
2781  return Builder.CreateBitCast(
2782  Builder.CreateExtractValue(CheckedLoad, 0),
2783  cast<llvm::PointerType>(VTable->getType())->getElementType());
2784 }
2785 
2787  const CXXMethodDecl *callOperator,
2788  CallArgList &callArgs) {
2789  // Get the address of the call operator.
2790  const CGFunctionInfo &calleeFnInfo =
2791  CGM.getTypes().arrangeCXXMethodDeclaration(callOperator);
2792  llvm::Constant *calleePtr =
2793  CGM.GetAddrOfFunction(GlobalDecl(callOperator),
2794  CGM.getTypes().GetFunctionType(calleeFnInfo));
2795 
2796  // Prepare the return slot.
2797  const FunctionProtoType *FPT =
2798  callOperator->getType()->castAs<FunctionProtoType>();
2799  QualType resultType = FPT->getReturnType();
2800  ReturnValueSlot returnSlot;
2801  if (!resultType->isVoidType() &&
2802  calleeFnInfo.getReturnInfo().getKind() == ABIArgInfo::Indirect &&
2803  !hasScalarEvaluationKind(calleeFnInfo.getReturnType()))
2804  returnSlot = ReturnValueSlot(ReturnValue, resultType.isVolatileQualified());
2805 
2806  // We don't need to separately arrange the call arguments because
2807  // the call can't be variadic anyway --- it's impossible to forward
2808  // variadic arguments.
2809 
2810  // Now emit our call.
2811  auto callee = CGCallee::forDirect(calleePtr, callOperator);
2812  RValue RV = EmitCall(calleeFnInfo, callee, returnSlot, callArgs);
2813 
2814  // If necessary, copy the returned value into the slot.
2815  if (!resultType->isVoidType() && returnSlot.isNull()) {
2816  if (getLangOpts().ObjCAutoRefCount && resultType->isObjCRetainableType()) {
2817  RV = RValue::get(EmitARCRetainAutoreleasedReturnValue(RV.getScalarVal()));
2818  }
2819  EmitReturnOfRValue(RV, resultType);
2820  } else
2821  EmitBranchThroughCleanup(ReturnBlock);
2822 }
2823 
2825  const BlockDecl *BD = BlockInfo->getBlockDecl();
2826  const VarDecl *variable = BD->capture_begin()->getVariable();
2827  const CXXRecordDecl *Lambda = variable->getType()->getAsCXXRecordDecl();
2828  const CXXMethodDecl *CallOp = Lambda->getLambdaCallOperator();
2829 
2830  if (CallOp->isVariadic()) {
2831  // FIXME: Making this work correctly is nasty because it requires either
2832  // cloning the body of the call operator or making the call operator
2833  // forward.
2834  CGM.ErrorUnsupported(CurCodeDecl, "lambda conversion to variadic function");
2835  return;
2836  }
2837 
2838  // Start building arguments for forwarding call
2839  CallArgList CallArgs;
2840 
2841  QualType ThisType = getContext().getPointerType(getContext().getRecordType(Lambda));
2842  Address ThisPtr = GetAddrOfBlockDecl(variable);
2843  CallArgs.add(RValue::get(ThisPtr.getPointer()), ThisType);
2844 
2845  // Add the rest of the parameters.
2846  for (auto param : BD->parameters())
2847  EmitDelegateCallArg(CallArgs, param, param->getBeginLoc());
2848 
2849  assert(!Lambda->isGenericLambda() &&
2850  "generic lambda interconversion to block not implemented");
2851  EmitForwardingCallToLambda(CallOp, CallArgs);
2852 }
2853 
2855  const CXXRecordDecl *Lambda = MD->getParent();
2856 
2857  // Start building arguments for forwarding call
2858  CallArgList CallArgs;
2859 
2860  QualType ThisType = getContext().getPointerType(getContext().getRecordType(Lambda));
2861  llvm::Value *ThisPtr = llvm::UndefValue::get(getTypes().ConvertType(ThisType));
2862  CallArgs.add(RValue::get(ThisPtr), ThisType);
2863 
2864  // Add the rest of the parameters.
2865  for (auto Param : MD->parameters())
2866  EmitDelegateCallArg(CallArgs, Param, Param->getBeginLoc());
2867 
2868  const CXXMethodDecl *CallOp = Lambda->getLambdaCallOperator();
2869  // For a generic lambda, find the corresponding call operator specialization
2870  // to which the call to the static-invoker shall be forwarded.
2871  if (Lambda->isGenericLambda()) {
2872  assert(MD->isFunctionTemplateSpecialization());
2874  FunctionTemplateDecl *CallOpTemplate = CallOp->getDescribedFunctionTemplate();
2875  void *InsertPos = nullptr;
2876  FunctionDecl *CorrespondingCallOpSpecialization =
2877  CallOpTemplate->findSpecialization(TAL->asArray(), InsertPos);
2878  assert(CorrespondingCallOpSpecialization);
2879  CallOp = cast<CXXMethodDecl>(CorrespondingCallOpSpecialization);
2880  }
2881  EmitForwardingCallToLambda(CallOp, CallArgs);
2882 }
2883 
2885  if (MD->isVariadic()) {
2886  // FIXME: Making this work correctly is nasty because it requires either
2887  // cloning the body of the call operator or making the call operator forward.
2888  CGM.ErrorUnsupported(MD, "lambda conversion to variadic function");
2889  return;
2890  }
2891 
2892  EmitLambdaDelegatingInvokeBody(MD);
2893 }
bool isBaseInitializer() const
Determine whether this initializer is initializing a base class.
Definition: DeclCXX.h:2319
ReturnValueSlot - Contains the address where the return value of a function can be stored...
Definition: CGCall.h:361
void EnterDtorCleanups(const CXXDestructorDecl *Dtor, CXXDtorType Type)
EnterDtorCleanups - Enter the cleanups necessary to complete the given phase of destruction for a des...
Definition: CGClass.cpp:1751
Represents a function declaration or definition.
Definition: Decl.h:1732
int64_t QuantityType
Definition: CharUnits.h:40
LValue MakeNaturalAlignPointeeAddrLValue(llvm::Value *V, QualType T)
Given a value of type T* that may not be to a complete object, construct an l-value with the natural ...
Expr * getInit() const
Get the initializer.
Definition: DeclCXX.h:2448
void EmitDelegateCXXConstructorCall(const CXXConstructorDecl *Ctor, CXXCtorType CtorType, const FunctionArgList &Args, SourceLocation Loc)
Definition: CGClass.cpp:2293
Complete object ctor.
Definition: ABI.h:26
A (possibly-)qualified type.
Definition: Type.h:642
const CGBitFieldInfo & getBitFieldInfo(const FieldDecl *FD) const
Return the BitFieldInfo that corresponds to the field FD.
Address EmitCXXMemberDataPointerAddress(const Expr *E, Address base, llvm::Value *memberPtr, const MemberPointerType *memberPtrType, LValueBaseInfo *BaseInfo=nullptr, TBAAAccessInfo *TBAAInfo=nullptr)
Emit the address of a field using a member data pointer.
Definition: CGClass.cpp:129
void EmitCtorPrologue(const CXXConstructorDecl *CD, CXXCtorType Type, FunctionArgList &Args)
EmitCtorPrologue - This routine generates necessary code to initialize base classes and non-static da...
Definition: CGClass.cpp:1255
bool isPODType(const ASTContext &Context) const
Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
Definition: Type.cpp:2093
base_class_range bases()
Definition: DeclCXX.h:823
ValueDecl * getMemberDecl() const
Retrieve the member declaration to which this expression refers.
Definition: Expr.h:2568
unsigned getNumBases() const
Retrieves the number of base classes of this class.
Definition: DeclCXX.h:817
CGRecordLayout - This class handles struct and union layout info while lowering AST types to LLVM typ...
bool isBlacklistedType(SanitizerMask Mask, StringRef MangledTypeName, StringRef Category=StringRef()) const
FunctionDecl * findSpecialization(ArrayRef< TemplateArgument > Args, void *&InsertPos)
Return the specialization with the provided arguments if it exists, otherwise return the insertion po...
capture_const_iterator capture_begin() const
Definition: Decl.h:3979
llvm::LLVMContext & getLLVMContext()
CharUnits getClassPointerAlignment(const CXXRecordDecl *CD)
Returns the assumed alignment of an opaque pointer to the given class.
Definition: CGClass.cpp:36
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D...
Stmt - This represents one statement.
Definition: Stmt.h:66
Address GetAddressOfDirectBaseInCompleteClass(Address Value, const CXXRecordDecl *Derived, const CXXRecordDecl *Base, bool BaseIsVirtual)
GetAddressOfBaseOfCompleteClass - Convert the given pointer to a complete class to the given direct b...
Definition: CGClass.cpp:199
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:233
unsigned getNumVBases() const
Retrieves the number of virtual base classes of this class.
Definition: DeclCXX.h:838
Address GetAddressOfDerivedClass(Address Value, const CXXRecordDecl *Derived, CastExpr::path_const_iterator PathBegin, CastExpr::path_const_iterator PathEnd, bool NullCheckValue)
Definition: CGClass.cpp:374
Checking the &#39;this&#39; pointer for a constructor call.
const Type * getTypeForDecl() const
Definition: Decl.h:2890
const Decl * CurCodeDecl
CurCodeDecl - This is the inner-most code context, which includes blocks.
bool isVirtual() const
Determines whether the base class is a virtual base class (or not).
Definition: DeclCXX.h:245
Defines the C++ template declaration subclasses.
StringRef P
void EmitLambdaStaticInvokeBody(const CXXMethodDecl *MD)
Definition: CGClass.cpp:2884
unsigned getFieldIndex() const
Returns the index of this field within its record, as appropriate for passing to ASTRecordLayout::get...
Definition: Decl.cpp:3793
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:6219
llvm::Value * LoadCXXThis()
LoadCXXThis - Load the value of &#39;this&#39;.
const RecordDecl * getParent() const
Returns the parent of this field declaration, which is the struct in which this field is defined...
Definition: Decl.h:2755
static bool isMemcpyEquivalentSpecialMember(const CXXMethodDecl *D)
Definition: CGClass.cpp:573
The base class of the type hierarchy.
Definition: Type.h:1415
Expr * getOperatorDeleteThisArg() const
Definition: DeclCXX.h:2736
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2808
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1262
bool isZero() const
isZero - Test whether the quantity equals zero.
Definition: CharUnits.h:116
SourceLocation getEndLoc() const LLVM_READONLY
Definition: DeclBase.h:414
CharUnits getAlignment() const
getAlignment - Get the record alignment in characters.
Definition: RecordLayout.h:177
LValue EmitLValueForFieldInitialization(LValue Base, const FieldDecl *Field)
EmitLValueForFieldInitialization - Like EmitLValueForField, except that if the Field is a reference...
Definition: CGExpr.cpp:3964
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2478
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3161
const RecordType * getAsUnionType() const
NOTE: getAs*ArrayType are methods on ASTContext.
Definition: Type.cpp:532
bool isDefaultConstructor() const
Whether this constructor is a default constructor (C++ [class.ctor]p5), which can be used to default-...
Definition: DeclCXX.cpp:2346
bool isIndirectMemberInitializer() const
Definition: DeclCXX.h:2331
const CXXBaseSpecifier *const * path_const_iterator
Definition: Expr.h:2877
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
Represents a variable declaration or definition.
Definition: Decl.h:812
RAII object to set/unset CodeGenFunction::IsSanitizerScope.
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6683
const void * Store
Store - This opaque type encapsulates an immutable mapping from locations to values.
Definition: StoreRef.h:28
llvm::Value * GetVTTParameter(GlobalDecl GD, bool ForVirtualBase, bool Delegating)
GetVTTParameter - Return the VTT parameter that should be passed to a base constructor/destructor wit...
Definition: CGClass.cpp:431
bool field_empty() const
Definition: Decl.h:3784
llvm::Value * getPointer() const
Definition: Address.h:38
void emitImplicitAssignmentOperatorBody(FunctionArgList &Args)
Definition: CGClass.cpp:1515
The collection of all-type qualifiers we support.
Definition: Type.h:141
void add(RValue rvalue, QualType type)
Definition: CGCall.h:285
bool mayInsertExtraPadding(bool EmitRemark=false) const
Whether we are allowed to insert extra padding between fields.
Definition: Decl.cpp:4188
bool isMoveAssignmentOperator() const
Determine whether this is a move assignment operator.
Definition: DeclCXX.cpp:2124
CharUnits getBaseOffset() const
getBaseOffset - Returns the base class offset.
Definition: BaseSubobject.h:46
static const CXXRecordDecl * LeastDerivedClassWithSameLayout(const CXXRecordDecl *RD)
Definition: CGClass.cpp:2574
const TargetInfo & getTarget() const
bool usesInAlloca() const
Return true if this function uses inalloca arguments.
AggValueSlot::Overlap_t overlapForBaseInit(const CXXRecordDecl *RD, const CXXRecordDecl *BaseRD, bool IsVirtual)
Determine whether a base class initialization may overlap some other object.
Definition: CGExprAgg.cpp:1796
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:1018
void emitDestroy(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
emitDestroy - Immediately perform the destruction of the given object.
Definition: CGDecl.cpp:1724
void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type, bool ForVirtualBase, bool Delegating, Address This, const CXXConstructExpr *E, AggValueSlot::Overlap_t Overlap, bool NewPointerIsChecked)
Definition: CGClass.cpp:2006
Address getAddress() const
Definition: CGValue.h:327
Indirect - Pass the argument indirectly via a hidden pointer with the specified alignment (0 indicate...
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
llvm::Type * ConvertType(QualType T)
ConvertType - Convert type T into a llvm::Type.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:154
bool hasTrivialBody() const
Returns whether the function has a trivial body that does not require any specific codegen...
Definition: Decl.cpp:2703
llvm::SmallPtrSet< const CXXRecordDecl *, 4 > VisitedVirtualBasesSetTy
void EmitSynthesizedCXXCopyCtorCall(const CXXConstructorDecl *D, Address This, Address Src, const CXXConstructExpr *E)
Definition: CGClass.cpp:2266
field_range fields() const
Definition: Decl.h:3776
bool isVolatileQualified() const
Definition: CGValue.h:258
Represents a member of a struct/union/class.
Definition: Decl.h:2571
bool ShouldEmitVTableTypeCheckedLoad(const CXXRecordDecl *RD)
Returns whether we should perform a type checked load when loading a virtual function for virtual cal...
Definition: CGClass.cpp:2749
bool isReferenceType() const
Definition: Type.h:6282
void pushEHDestroy(QualType::DestructionKind dtorKind, Address addr, QualType type)
pushEHDestroy - Push the standard destructor for the given type as an EH-only cleanup.
Definition: CGDecl.cpp:1666
void EmitVTablePtrCheck(const CXXRecordDecl *RD, llvm::Value *VTable, CFITypeCheckKind TCK, SourceLocation Loc)
EmitVTablePtrCheck - Emit a check that VTable is a valid virtual table for RD using llvm...
Definition: CGClass.cpp:2675
InheritedConstructor getInheritedConstructor() const
Get the constructor that this inheriting constructor is based on.
Definition: DeclCXX.h:2673
Denotes a cleanup that should run when a scope is exited using exceptional control flow (a throw stat...
Definition: EHScopeStack.h:81
static AggValueSlot forAddr(Address addr, Qualifiers quals, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
forAddr - Make a slot for an aggregate value.
Definition: CGValue.h:514
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:53
CharUnits getVBaseClassOffset(const CXXRecordDecl *VBase) const
getVBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:241
void EmitLambdaDelegatingInvokeBody(const CXXMethodDecl *MD)
Definition: CGClass.cpp:2854
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2246
void EmitInitializerForField(FieldDecl *Field, LValue LHS, Expr *Init)
Definition: CGClass.cpp:666
CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign, const CXXRecordDecl *Class, CharUnits ExpectedTargetAlign)
Given a class pointer with an actual known alignment, and the expected alignment of an object at a dy...
Definition: CGClass.cpp:70
void EmitInheritedCXXConstructorCall(const CXXConstructorDecl *D, bool ForVirtualBase, Address This, bool InheritedFromVBase, const CXXInheritedCtorInitExpr *E)
Emit a call to a constructor inherited from a base class, passing the current constructor&#39;s arguments...
Definition: CGClass.cpp:2146
void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D, const ArrayType *ArrayTy, Address ArrayPtr, const CXXConstructExpr *E, bool NewPointerIsChecked, bool ZeroInitialization=false)
EmitCXXAggrConstructorCall - Emit a loop to call a particular constructor for each of several members...
Definition: CGClass.cpp:1873
QualType getThisType(ASTContext &C) const
Returns the type of the this pointer.
Definition: DeclCXX.cpp:2176
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2649
bool isDelegatingConstructor() const
Determine whether this constructor is a delegating constructor.
Definition: DeclCXX.h:2588
Stmt * getBody(const FunctionDecl *&Definition) const
Retrieve the body (definition) of the function.
Definition: Decl.cpp:2728
Base object ctor.
Definition: ABI.h:27
bool isBaseVirtual() const
Returns whether the base is virtual or not.
Definition: DeclCXX.h:2372
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
void EmitTypeMetadataCodeForVCall(const CXXRecordDecl *RD, llvm::Value *VTable, SourceLocation Loc)
If whole-program virtual table optimization is enabled, emit an assumption that VTable is a member of...
Definition: CGClass.cpp:2599
uint32_t Offset
Definition: CacheTokens.cpp:43
bool isTriviallyCopyableType(const ASTContext &Context) const
Return true if this is a trivially copyable type (C++0x [basic.types]p9)
Definition: Type.cpp:2197
FunctionTemplateDecl * getDescribedFunctionTemplate() const
Retrieves the function template that is described by this function declaration.
Definition: Decl.cpp:3350
CharUnits StorageOffset
The offset of the bitfield storage from the start of the struct.
ArrayRef< NamedDecl * > chain() const
Definition: Decl.h:2839
unsigned char PointerWidthInBits
The width of a pointer into the generic address space.
Deleting dtor.
Definition: ABI.h:35
CharUnits getAlignment() const
Return the alignment of this pointer.
Definition: Address.h:67
bool isComplex() const
Definition: CGValue.h:53
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3107
bool needsEHCleanup(QualType::DestructionKind kind)
Determines whether an EH cleanup is required to destroy a type with the given destruction kind...
CXXCtorType getCtorType() const
Definition: GlobalDecl.h:66
const CGFunctionInfo & arrangeCXXConstructorCall(const CallArgList &Args, const CXXConstructorDecl *D, CXXCtorType CtorKind, unsigned ExtraPrefixArgs, unsigned ExtraSuffixArgs, bool PassProtoArgs=true)
Arrange a call to a C++ method, passing the given arguments.
Definition: CGCall.cpp:390
llvm::CallInst * CreateMemCpy(Address Dest, Address Src, llvm::Value *Size, bool IsVolatile=false)
Definition: CGBuilder.h:274
const Type * getClass() const
Definition: Type.h:2786
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
void EmitDeleteCall(const FunctionDecl *DeleteFD, llvm::Value *Ptr, QualType DeleteTy, llvm::Value *NumElements=nullptr, CharUnits CookieSize=CharUnits())
Definition: CGExprCXX.cpp:1756
param_type_iterator param_type_begin() const
Definition: Type.h:4010
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
bool isAnyMemberInitializer() const
Definition: DeclCXX.h:2327
base_class_iterator bases_begin()
Definition: DeclCXX.h:830
void ForceCleanup(std::initializer_list< llvm::Value **> ValuesToReload={})
Force the emission of cleanups now, instead of waiting until this object is destroyed.
bool isSimple() const
Definition: CGValue.h:252
FieldDecl * getAnyMember() const
Definition: DeclCXX.h:2392
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1478
GlobalDecl CurGD
CurGD - The GlobalDecl for the current function being compiled.
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1697
FieldDecl * getMember() const
If this is a member initializer, returns the declaration of the non-static data member being initiali...
Definition: DeclCXX.h:2386
bool isAbstract() const
Determine whether this class has a pure virtual function.
Definition: DeclCXX.h:1344
static bool BaseInitializerUsesThis(ASTContext &C, const Expr *Init)
Definition: CGClass.cpp:520
Address getAggregateAddress() const
getAggregateAddr() - Return the Value* of the address of the aggregate.
Definition: CGValue.h:71
init_iterator init_begin()
Retrieve an iterator to the first initializer.
Definition: DeclCXX.h:2527
bool isAnonymousStructOrUnion() const
Whether this is an anonymous struct or union.
Definition: Decl.h:3658
Represents the this expression in C++.
Definition: ExprCXX.h:966
LValue EmitLValueForField(LValue Base, const FieldDecl *Field)
Definition: CGExpr.cpp:3836
llvm::Constant * CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList(), bool Local=false)
Create a new runtime function with the specified type and name.
bool hasAttr() const
Definition: DeclBase.h:531
CanQualType getReturnType() const
static CharUnits One()
One - Construct a CharUnits quantity of one.
Definition: CharUnits.h:58
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:613
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1605
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3676
llvm::CallInst * EmitNounwindRuntimeCall(llvm::Value *callee, const Twine &name="")
bool isDynamicClass() const
Definition: DeclCXX.h:789
CXXConstructorDecl * getConstructor() const
Get the constructor that this expression will (ultimately) call.
Definition: ExprCXX.h:1325
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:39
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
AggValueSlot::Overlap_t overlapForFieldInit(const FieldDecl *FD)
Determine whether a field initialization may overlap some other object.
static void EmitLValueForAnyFieldInitialization(CodeGenFunction &CGF, CXXCtorInitializer *MemberInit, LValue &LHS)
Definition: CGClass.cpp:590
CXXCtorInitializer *const * init_const_iterator
Iterates through the member/base initializer list.
Definition: DeclCXX.h:2516
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:39
llvm::Value * GetVTablePtr(Address This, llvm::Type *VTableTy, const CXXRecordDecl *VTableClass)
GetVTablePtr - Return the Value of the vtable pointer member pointed to by This.
Definition: CGClass.cpp:2549
CXXDtorType
C++ destructor types.
Definition: ABI.h:34
Pepresents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:3850
This represents one expression.
Definition: Expr.h:105
bool isCopyOrMoveConstructor(unsigned &TypeQuals) const
Determine whether this is a copy or move constructor.
Definition: DeclCXX.cpp:2366
SourceLocation End
bool isVariadic() const
Whether this function is variadic.
Definition: Decl.cpp:2686
bool isDefaulted() const
Whether this function is defaulted per C++0x.
Definition: Decl.h:2028
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
void EmitVTableAssumptionLoad(const VPtr &vptr, Address This)
Emit assumption that vptr load == global vtable.
Definition: CGClass.cpp:2237
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6746
static CGCallee forDirect(llvm::Constant *functionPtr, const CGCalleeInfo &abstractInfo=CGCalleeInfo())
Definition: CGCall.h:134
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2700
bool isImplicit() const
isImplicit - Indicates whether the declaration was implicitly generated by the implementation.
Definition: DeclBase.h:547
const TemplateArgumentList * getTemplateSpecializationArgs() const
Retrieve the template arguments used to produce this function template specialization from the primar...
Definition: Decl.cpp:3471
QualType getTagDeclType(const TagDecl *Decl) const
Return the unique reference to the type for the specified TagDecl (struct/union/class/enum) decl...
llvm::PointerType * getType() const
Return the type of the pointer value.
Definition: Address.h:44
arg_range arguments()
Definition: ExprCXX.h:1371
const CXXRecordDecl * getPrimaryBase() const
getPrimaryBase - Get the primary base for this record.
Definition: RecordLayout.h:218
unsigned getFieldCount() const
getFieldCount - Get the number of fields in the layout.
Definition: RecordLayout.h:187
void EmitAsanPrologueOrEpilogue(bool Prologue)
Definition: CGClass.cpp:756
const AstTypeMatcher< ArrayType > arrayType
Matches all kinds of arrays.
bool isFunctionTemplateSpecialization() const
Determine whether this function is a function template specialization.
Definition: Decl.h:2432
llvm::LLVMContext & getLLVMContext()
const CXXRecordDecl * getBase() const
getBase - Returns the base class declaration.
Definition: BaseSubobject.h:43
bool isPolymorphic() const
Whether this class is polymorphic (C++ [class.virtual]), which means that the class contains or inher...
Definition: DeclCXX.h:1337
Base object dtor.
Definition: ABI.h:37
void EmitConstructorBody(FunctionArgList &Args)
EmitConstructorBody - Emits the body of the current constructor.
Definition: CGClass.cpp:819
CharUnits alignmentOfArrayElement(CharUnits elementSize) const
Given that this is the alignment of the first element of an array, return the minimum alignment of an...
Definition: CharUnits.h:197
LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T)
QualType getRecordType(const RecordDecl *Decl) const
A scoped helper to set the current debug location to an inlined location.
Definition: CGDebugInfo.h:731
void EmitForwardingCallToLambda(const CXXMethodDecl *LambdaCallOperator, CallArgList &CallArgs)
Definition: CGClass.cpp:2786
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:1789
const TargetInfo & getTarget() const
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:1402
bool isTrivial() const
Whether this function is "trivial" in some specialized C++ senses.
Definition: Decl.h:2020
const LangOptions & getLangOpts() const
ASTContext & getContext() const
The COMDAT used for dtors.
Definition: ABI.h:38
const SanitizerBlacklist & getSanitizerBlacklist() const
Definition: ASTContext.h:718
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:35
std::pair< CharUnits, CharUnits > getTypeInfoDataSizeInChars(QualType T) const
static const RecordType * getRecordType(QualType QT)
Checks that the passed in QualType either is of RecordType or points to RecordType.
The l-value was considered opaque, so the alignment was determined from a type.
RecordDecl * getDecl() const
Definition: Type.h:4356
static bool CanSkipVTablePointerInitialization(CodeGenFunction &CGF, const CXXDestructorDecl *Dtor)
CanSkipVTablePointerInitialization - Check whether we need to initialize any vtable pointers before c...
Definition: CGClass.cpp:1387
uint64_t getFieldOffset(unsigned FieldNo) const
getFieldOffset - Get the offset of the given field index, in bits.
Definition: RecordLayout.h:191
void set(SanitizerMask K, bool Value)
Enable or disable a certain (single) sanitizer.
Definition: Sanitizers.h:61
Enumerates target-specific builtins in their own namespaces within namespace clang.
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:142
Represents a call to an inherited base class constructor from an inheriting constructor.
Definition: ExprCXX.h:1423
void PushDestructorCleanup(QualType T, Address Addr)
PushDestructorCleanup - Push a cleanup to call the complete-object destructor of an object of the giv...
Definition: CGClass.cpp:2406
Encodes a location in the source.
body_range body()
Definition: Stmt.h:644
QualType getReturnType() const
Definition: Type.h:3607
Expr * getSubExpr() const
Definition: Expr.h:1816
void EmitVTableAssumptionLoads(const CXXRecordDecl *ClassDecl, Address This)
Emit assumption load for all bases.
Definition: CGClass.cpp:2258
bool inheritingCtorHasParams(const InheritedConstructor &Inherited, CXXCtorType Type)
Determine if a C++ inheriting constructor should have parameters matching those of its inherited cons...
Definition: CGCall.cpp:290
Represents a call to a member function that may be written either with member call syntax (e...
Definition: ExprCXX.h:164
const Decl * getDecl() const
Definition: GlobalDecl.h:64
An aggregate value slot.
Definition: CGValue.h:437
init_iterator init_end()
Retrieve an iterator past the last initializer.
Definition: DeclCXX.h:2536
A scoped helper to set the current debug location to the specified location or preferred location of ...
Definition: CGDebugInfo.h:677
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2041
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2419
void EmitStmt(const Stmt *S, ArrayRef< const Attr *> Attrs=None)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:48
virtual size_t getSrcArgforCopyCtor(const CXXConstructorDecl *, FunctionArgList &Args) const =0
const ParmVarDecl * getParamDecl(unsigned i) const
Definition: Decl.h:2269
SanitizerSet SanOpts
Sanitizers enabled for this function.
bool isGenericLambda() const
Determine whether this class describes a generic lambda function object (i.e.
Definition: DeclCXX.cpp:1348
An aligned address.
Definition: Address.h:25
ImplicitCastExpr - Allows us to explicitly represent implicit type conversions, which have no direct ...
Definition: Expr.h:2929
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1160
All available information about a concrete callee.
Definition: CGCall.h:67
bool isUsed(bool CheckUsedAttr=true) const
Whether any (re-)declaration of the entity was used, meaning that a definition is required...
Definition: DeclBase.cpp:397
Complete object dtor.
Definition: ABI.h:36
void EmitInlinedInheritingCXXConstructorCall(const CXXConstructorDecl *Ctor, CXXCtorType CtorType, bool ForVirtualBase, bool Delegating, CallArgList &Args)
Emit a call to an inheriting constructor (that is, one that invokes a constructor inherited from a ba...
Definition: CGClass.cpp:2193
static void EmitBaseInitializer(CodeGenFunction &CGF, const CXXRecordDecl *ClassDecl, CXXCtorInitializer *BaseInit, CXXCtorType CtorType)
Definition: CGClass.cpp:526
CXXCtorType
C++ constructor types.
Definition: ABI.h:25
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:216
std::pair< CharUnits, CharUnits > getTypeInfoInChars(const Type *T) const
SourceLocation getLocation() const LLVM_READONLY
Definition: ExprCXX.h:1474
void InitializeVTablePointer(const VPtr &vptr)
Initialize the vtable pointer of the given subobject.
Definition: CGClass.cpp:2416
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
FunctionArgList - Type for representing both the decl and type of parameters to a function...
Definition: CGCall.h:356
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:59
CGFunctionInfo - Class to encapsulate the information about a function definition.
CharUnits alignmentAtOffset(CharUnits offset) const
Given that this is a non-zero alignment value, what is the alignment at the given offset...
Definition: CharUnits.h:190
Dataflow Directional Tag Classes.
void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, bool ForVirtualBase, bool Delegating, Address This)
Definition: CGClass.cpp:2376
CXXMethodDecl * getLambdaCallOperator() const
Retrieve the lambda call operator of the closure type if this is a closure type.
Definition: DeclCXX.cpp:1362
void EmitVTablePtrCheckForCast(QualType T, llvm::Value *Derived, bool MayBeNull, CFITypeCheckKind TCK, SourceLocation Loc)
Derived is the presumed address of an object of type T after a cast.
Definition: CGClass.cpp:2629
static bool canEmitDelegateCallArgs(CodeGenFunction &CGF, const CXXConstructorDecl *Ctor, CXXCtorType Type, CallArgList &Args)
Definition: CGClass.cpp:2044
A scope within which we are constructing the fields of an object which might use a CXXDefaultInitExpr...
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2817
SourceLocation getSourceLocation() const
Determine the source location of the initializer.
Definition: DeclCXX.cpp:2263
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:70
void EmitDelegatingCXXConstructorCall(const CXXConstructorDecl *Ctor, const FunctionArgList &Args)
Definition: CGClass.cpp:2347
bool areArgsDestroyedLeftToRightInCallee() const
Are arguments to a call destroyed left to right in the callee? This is a fundamental language change...
Definition: TargetCXXABI.h:209
const CXXRecordDecl * getParent() const
Returns the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2166
bool isListInitialization() const
Whether this constructor call was written as list-initialization.
Definition: ExprCXX.h:1340
void InitializeVTablePointers(const CXXRecordDecl *ClassDecl)
Definition: CGClass.cpp:2535
const Type * getBaseClass() const
If this is a base class initializer, returns the type of the base class.
Definition: DeclCXX.cpp:2256
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2752
bool isCopyAssignmentOperator() const
Determine whether this is a copy-assignment operator, regardless of whether it was declared implicitl...
Definition: DeclCXX.cpp:2103
bool isBitField() const
Definition: CGValue.h:254
bool hasObjCLifetime() const
Definition: Type.h:329
static AggValueSlot forLValue(const LValue &LV, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
Definition: CGValue.h:540
bool isDestroyingOperatorDelete() const
Determine whether this is a destroying operator delete.
Definition: Decl.cpp:2881
ConstEvaluatedExprVisitor - This class visits &#39;const Expr *&#39;s.
CharUnits getVBaseAlignment(CharUnits DerivedAlign, const CXXRecordDecl *Derived, const CXXRecordDecl *VBase)
Returns the assumed alignment of a virtual base of a class.
Definition: CGClass.cpp:55
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1773
JumpDest ReturnBlock
ReturnBlock - Unified return block.
const FunctionDecl * getOperatorDelete() const
Definition: DeclCXX.h:2732
uint64_t SanitizerMask
Definition: Sanitizers.h:26
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4346
StructorType getFromCtorType(CXXCtorType T)
Definition: CodeGenTypes.h:77
CodeGenTypes & getTypes() const
Represents a C++ base or member initializer.
Definition: DeclCXX.h:2253
Address getBitFieldAddress() const
Definition: CGValue.h:355
IndirectFieldDecl * getIndirectMember() const
Definition: DeclCXX.h:2400
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:52
uint64_t getCharWidth() const
Return the size of the character type, in bits.
Definition: ASTContext.h:2080
llvm::Constant * GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl, CastExpr::path_const_iterator PathBegin, CastExpr::path_const_iterator PathEnd)
Returns the offset from a derived class to a class.
Definition: CGClass.cpp:177
Opcode getOpcode() const
Definition: Expr.h:1813
Expr * getArg(unsigned Arg)
Return the specified argument.
Definition: ExprCXX.h:1388
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:445
Represents a base class of a C++ class.
Definition: DeclCXX.h:192
VPtrsVector getVTablePointers(const CXXRecordDecl *VTableClass)
Definition: CGClass.cpp:2467
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2259
A template argument list.
Definition: DeclTemplate.h:210
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
int64_t toBits(CharUnits CharSize) const
Convert a size in characters to a size in bits.
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:2472
static void EmitMemberInitializer(CodeGenFunction &CGF, const CXXRecordDecl *ClassDecl, CXXCtorInitializer *MemberInit, const CXXConstructorDecl *Constructor, FunctionArgList &Args)
Definition: CGClass.cpp:604
Represents a C++ struct/union/class.
Definition: DeclCXX.h:300
bool isVoidType() const
Definition: Type.h:6497
unsigned getBuiltinID() const
Returns a value indicating whether this function corresponds to a builtin function.
Definition: Decl.cpp:2976
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6073
static bool IsConstructorDelegationValid(const CXXConstructorDecl *Ctor)
Checks whether the given constructor is a valid subject for the complete-to-base constructor delegati...
Definition: CGClass.cpp:708
CharUnits getNonVirtualSize() const
getNonVirtualSize - Get the non-virtual size (in chars) of an object, which is the size of the object...
Definition: RecordLayout.h:203
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:268
void EmitVTablePtrCheckForCall(const CXXRecordDecl *RD, llvm::Value *VTable, CFITypeCheckKind TCK, SourceLocation Loc)
EmitVTablePtrCheckForCall - Virtual method MD is being called via VTable.
Definition: CGClass.cpp:2619
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2290
CharUnits computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass, CastExpr::path_const_iterator Start, CastExpr::path_const_iterator End)
Definition: CGClass.cpp:149
static bool isInitializerOfDynamicClass(const CXXCtorInitializer *BaseInit)
Definition: CGClass.cpp:1246
bool hasVolatile() const
Definition: Type.h:265
CGCXXABI & getCXXABI() const
std::string getQualifiedNameAsString() const
Definition: Decl.cpp:1520
static Address ApplyNonVirtualAndVirtualOffset(CodeGenFunction &CGF, Address addr, CharUnits nonVirtualOffset, llvm::Value *virtualOffset, const CXXRecordDecl *derivedClass, const CXXRecordDecl *nearestVBase)
Definition: CGClass.cpp:227
Struct with all information about dynamic [sub]class needed to set vptr.
void EmitAggregateCopy(LValue Dest, LValue Src, QualType EltTy, AggValueSlot::Overlap_t MayOverlap, bool isVolatile=false)
EmitAggregateCopy - Emit an aggregate copy.
Definition: CGExprAgg.cpp:1819
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
bool isUnion() const
Definition: Decl.h:3244
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:3936
void EmitDestructorBody(FunctionArgList &Args)
EmitDestructorBody - Emits the body of the current destructor.
Definition: CGClass.cpp:1405
__DEVICE__ int min(int __a, int __b)
void EmitBranchThroughCleanup(JumpDest Dest)
EmitBranchThroughCleanup - Emit a branch from the current insert block through the normal cleanup han...
Definition: CGCleanup.cpp:1050
QualType getType() const
Definition: Decl.h:647
unsigned getNumArgs() const
Definition: ExprCXX.h:1385
LValue - This represents an lvalue references.
Definition: CGValue.h:167
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:147
static bool HasTrivialDestructorBody(ASTContext &Context, const CXXRecordDecl *BaseClassDecl, const CXXRecordDecl *MostDerivedClassDecl)
Definition: CGClass.cpp:1324
Notes how many arguments were added to the beginning (Prefix) and ending (Suffix) of an arg list...
Definition: CGCXXABI.h:300
const LangOptions & getLangOpts() const
unsigned getNumParams() const
Return the number of parameters this function must have based on its FunctionType.
Definition: Decl.cpp:3037
const CGRecordLayout & getCGRecordLayout(const RecordDecl *)
getCGRecordLayout - Return record layout info for the given record decl.
Address GetAddressOfBaseClass(Address Value, const CXXRecordDecl *Derived, CastExpr::path_const_iterator PathBegin, CastExpr::path_const_iterator PathEnd, bool NullCheckValue, SourceLocation Loc)
GetAddressOfBaseClass - This function will add the necessary delta to the load of &#39;this&#39; and returns ...
Definition: CGClass.cpp:267
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:260
const LangOptions & getLangOpts() const
Definition: ASTContext.h:716
base_class_range vbases()
Definition: DeclCXX.h:840
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:2868
Declaration of a template function.
Definition: DeclTemplate.h:968
static bool FieldHasTrivialDestructorBody(ASTContext &Context, const FieldDecl *Field)
Definition: CGClass.cpp:1367
llvm::Value * EmitVTableTypeCheckedLoad(const CXXRecordDecl *RD, llvm::Value *VTable, uint64_t VTableByteOffset)
Emit a type checked load from the given vtable.
Definition: CGClass.cpp:2761
bool isScalar() const
Definition: CGValue.h:52
QualType getPointeeType() const
Definition: Type.h:2772
Structure with information about how a bitfield should be accessed.
void Destroyer(CodeGenFunction &CGF, Address addr, QualType ty)
method_range methods() const
Definition: DeclCXX.h:865
QualType getType() const
Retrieves the type of the base class.
Definition: DeclCXX.h:291