clang  14.0.0git
MicrosoftCXXABI.cpp
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1 //===--- MicrosoftCXXABI.cpp - Emit LLVM Code from ASTs for a Module ------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This provides C++ code generation targeting the Microsoft Visual C++ ABI.
10 // The class in this file generates structures that follow the Microsoft
11 // Visual C++ ABI, which is actually not very well documented at all outside
12 // of Microsoft.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #include "CGCXXABI.h"
17 #include "CGCleanup.h"
18 #include "CGVTables.h"
19 #include "CodeGenModule.h"
20 #include "CodeGenTypes.h"
21 #include "TargetInfo.h"
22 #include "clang/AST/Attr.h"
24 #include "clang/AST/Decl.h"
25 #include "clang/AST/DeclCXX.h"
26 #include "clang/AST/StmtCXX.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/ADT/StringSet.h"
31 #include "llvm/IR/Intrinsics.h"
32 
33 using namespace clang;
34 using namespace CodeGen;
35 
36 namespace {
37 
38 /// Holds all the vbtable globals for a given class.
39 struct VBTableGlobals {
40  const VPtrInfoVector *VBTables;
42 };
43 
44 class MicrosoftCXXABI : public CGCXXABI {
45 public:
46  MicrosoftCXXABI(CodeGenModule &CGM)
47  : CGCXXABI(CGM), BaseClassDescriptorType(nullptr),
48  ClassHierarchyDescriptorType(nullptr),
49  CompleteObjectLocatorType(nullptr), CatchableTypeType(nullptr),
50  ThrowInfoType(nullptr) {}
51 
52  bool HasThisReturn(GlobalDecl GD) const override;
53  bool hasMostDerivedReturn(GlobalDecl GD) const override;
54 
55  bool classifyReturnType(CGFunctionInfo &FI) const override;
56 
57  RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const override;
58 
59  bool isSRetParameterAfterThis() const override { return true; }
60 
61  bool isThisCompleteObject(GlobalDecl GD) const override {
62  // The Microsoft ABI doesn't use separate complete-object vs.
63  // base-object variants of constructors, but it does of destructors.
64  if (isa<CXXDestructorDecl>(GD.getDecl())) {
65  switch (GD.getDtorType()) {
66  case Dtor_Complete:
67  case Dtor_Deleting:
68  return true;
69 
70  case Dtor_Base:
71  return false;
72 
73  case Dtor_Comdat: llvm_unreachable("emitting dtor comdat as function?");
74  }
75  llvm_unreachable("bad dtor kind");
76  }
77 
78  // No other kinds.
79  return false;
80  }
81 
82  size_t getSrcArgforCopyCtor(const CXXConstructorDecl *CD,
83  FunctionArgList &Args) const override {
84  assert(Args.size() >= 2 &&
85  "expected the arglist to have at least two args!");
86  // The 'most_derived' parameter goes second if the ctor is variadic and
87  // has v-bases.
88  if (CD->getParent()->getNumVBases() > 0 &&
90  return 2;
91  return 1;
92  }
93 
94  std::vector<CharUnits> getVBPtrOffsets(const CXXRecordDecl *RD) override {
95  std::vector<CharUnits> VBPtrOffsets;
96  const ASTContext &Context = getContext();
97  const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
98 
99  const VBTableGlobals &VBGlobals = enumerateVBTables(RD);
100  for (const std::unique_ptr<VPtrInfo> &VBT : *VBGlobals.VBTables) {
101  const ASTRecordLayout &SubobjectLayout =
102  Context.getASTRecordLayout(VBT->IntroducingObject);
103  CharUnits Offs = VBT->NonVirtualOffset;
104  Offs += SubobjectLayout.getVBPtrOffset();
105  if (VBT->getVBaseWithVPtr())
106  Offs += Layout.getVBaseClassOffset(VBT->getVBaseWithVPtr());
107  VBPtrOffsets.push_back(Offs);
108  }
109  llvm::array_pod_sort(VBPtrOffsets.begin(), VBPtrOffsets.end());
110  return VBPtrOffsets;
111  }
112 
113  StringRef GetPureVirtualCallName() override { return "_purecall"; }
114  StringRef GetDeletedVirtualCallName() override { return "_purecall"; }
115 
116  void emitVirtualObjectDelete(CodeGenFunction &CGF, const CXXDeleteExpr *DE,
117  Address Ptr, QualType ElementType,
118  const CXXDestructorDecl *Dtor) override;
119 
120  void emitRethrow(CodeGenFunction &CGF, bool isNoReturn) override;
121  void emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) override;
122 
123  void emitBeginCatch(CodeGenFunction &CGF, const CXXCatchStmt *C) override;
124 
125  llvm::GlobalVariable *getMSCompleteObjectLocator(const CXXRecordDecl *RD,
126  const VPtrInfo &Info);
127 
128  llvm::Constant *getAddrOfRTTIDescriptor(QualType Ty) override;
130  getAddrOfCXXCatchHandlerType(QualType Ty, QualType CatchHandlerType) override;
131 
132  /// MSVC needs an extra flag to indicate a catchall.
133  CatchTypeInfo getCatchAllTypeInfo() override {
134  // For -EHa catch(...) must handle HW exception
135  // Adjective = HT_IsStdDotDot (0x40), only catch C++ exceptions
136  if (getContext().getLangOpts().EHAsynch)
137  return CatchTypeInfo{nullptr, 0};
138  else
139  return CatchTypeInfo{nullptr, 0x40};
140  }
141 
142  bool shouldTypeidBeNullChecked(bool IsDeref, QualType SrcRecordTy) override;
143  void EmitBadTypeidCall(CodeGenFunction &CGF) override;
144  llvm::Value *EmitTypeid(CodeGenFunction &CGF, QualType SrcRecordTy,
145  Address ThisPtr,
146  llvm::Type *StdTypeInfoPtrTy) override;
147 
148  bool shouldDynamicCastCallBeNullChecked(bool SrcIsPtr,
149  QualType SrcRecordTy) override;
150 
151  llvm::Value *EmitDynamicCastCall(CodeGenFunction &CGF, Address Value,
152  QualType SrcRecordTy, QualType DestTy,
153  QualType DestRecordTy,
154  llvm::BasicBlock *CastEnd) override;
155 
156  llvm::Value *EmitDynamicCastToVoid(CodeGenFunction &CGF, Address Value,
157  QualType SrcRecordTy,
158  QualType DestTy) override;
159 
160  bool EmitBadCastCall(CodeGenFunction &CGF) override;
161  bool canSpeculativelyEmitVTable(const CXXRecordDecl *RD) const override {
162  return false;
163  }
164 
165  llvm::Value *
166  GetVirtualBaseClassOffset(CodeGenFunction &CGF, Address This,
167  const CXXRecordDecl *ClassDecl,
168  const CXXRecordDecl *BaseClassDecl) override;
169 
170  llvm::BasicBlock *
171  EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
172  const CXXRecordDecl *RD) override;
173 
174  llvm::BasicBlock *
175  EmitDtorCompleteObjectHandler(CodeGenFunction &CGF);
176 
177  void initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF,
178  const CXXRecordDecl *RD) override;
179 
180  void EmitCXXConstructors(const CXXConstructorDecl *D) override;
181 
182  // Background on MSVC destructors
183  // ==============================
184  //
185  // Both Itanium and MSVC ABIs have destructor variants. The variant names
186  // roughly correspond in the following way:
187  // Itanium Microsoft
188  // Base -> no name, just ~Class
189  // Complete -> vbase destructor
190  // Deleting -> scalar deleting destructor
191  // vector deleting destructor
192  //
193  // The base and complete destructors are the same as in Itanium, although the
194  // complete destructor does not accept a VTT parameter when there are virtual
195  // bases. A separate mechanism involving vtordisps is used to ensure that
196  // virtual methods of destroyed subobjects are not called.
197  //
198  // The deleting destructors accept an i32 bitfield as a second parameter. Bit
199  // 1 indicates if the memory should be deleted. Bit 2 indicates if the this
200  // pointer points to an array. The scalar deleting destructor assumes that
201  // bit 2 is zero, and therefore does not contain a loop.
202  //
203  // For virtual destructors, only one entry is reserved in the vftable, and it
204  // always points to the vector deleting destructor. The vector deleting
205  // destructor is the most general, so it can be used to destroy objects in
206  // place, delete single heap objects, or delete arrays.
207  //
208  // A TU defining a non-inline destructor is only guaranteed to emit a base
209  // destructor, and all of the other variants are emitted on an as-needed basis
210  // in COMDATs. Because a non-base destructor can be emitted in a TU that
211  // lacks a definition for the destructor, non-base destructors must always
212  // delegate to or alias the base destructor.
213 
214  AddedStructorArgCounts
215  buildStructorSignature(GlobalDecl GD,
216  SmallVectorImpl<CanQualType> &ArgTys) override;
217 
218  /// Non-base dtors should be emitted as delegating thunks in this ABI.
219  bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
220  CXXDtorType DT) const override {
221  return DT != Dtor_Base;
222  }
223 
224  void setCXXDestructorDLLStorage(llvm::GlobalValue *GV,
225  const CXXDestructorDecl *Dtor,
226  CXXDtorType DT) const override;
227 
228  llvm::GlobalValue::LinkageTypes
229  getCXXDestructorLinkage(GVALinkage Linkage, const CXXDestructorDecl *Dtor,
230  CXXDtorType DT) const override;
231 
232  void EmitCXXDestructors(const CXXDestructorDecl *D) override;
233 
234  const CXXRecordDecl *
235  getThisArgumentTypeForMethod(const CXXMethodDecl *MD) override {
236  if (MD->isVirtual() && !isa<CXXDestructorDecl>(MD)) {
238  CGM.getMicrosoftVTableContext().getMethodVFTableLocation(MD);
239  // The vbases might be ordered differently in the final overrider object
240  // and the complete object, so the "this" argument may sometimes point to
241  // memory that has no particular type (e.g. past the complete object).
242  // In this case, we just use a generic pointer type.
243  // FIXME: might want to have a more precise type in the non-virtual
244  // multiple inheritance case.
245  if (ML.VBase || !ML.VFPtrOffset.isZero())
246  return nullptr;
247  }
248  return MD->getParent();
249  }
250 
251  Address
252  adjustThisArgumentForVirtualFunctionCall(CodeGenFunction &CGF, GlobalDecl GD,
253  Address This,
254  bool VirtualCall) override;
255 
256  void addImplicitStructorParams(CodeGenFunction &CGF, QualType &ResTy,
257  FunctionArgList &Params) override;
258 
259  void EmitInstanceFunctionProlog(CodeGenFunction &CGF) override;
260 
261  AddedStructorArgs getImplicitConstructorArgs(CodeGenFunction &CGF,
262  const CXXConstructorDecl *D,
264  bool ForVirtualBase,
265  bool Delegating) override;
266 
268  const CXXDestructorDecl *DD,
270  bool ForVirtualBase,
271  bool Delegating) override;
272 
273  void EmitDestructorCall(CodeGenFunction &CGF, const CXXDestructorDecl *DD,
274  CXXDtorType Type, bool ForVirtualBase,
275  bool Delegating, Address This,
276  QualType ThisTy) override;
277 
278  void emitVTableTypeMetadata(const VPtrInfo &Info, const CXXRecordDecl *RD,
279  llvm::GlobalVariable *VTable);
280 
281  void emitVTableDefinitions(CodeGenVTables &CGVT,
282  const CXXRecordDecl *RD) override;
283 
284  bool isVirtualOffsetNeededForVTableField(CodeGenFunction &CGF,
285  CodeGenFunction::VPtr Vptr) override;
286 
287  /// Don't initialize vptrs if dynamic class
288  /// is marked with with the 'novtable' attribute.
289  bool doStructorsInitializeVPtrs(const CXXRecordDecl *VTableClass) override {
290  return !VTableClass->hasAttr<MSNoVTableAttr>();
291  }
292 
293  llvm::Constant *
294  getVTableAddressPoint(BaseSubobject Base,
295  const CXXRecordDecl *VTableClass) override;
296 
297  llvm::Value *getVTableAddressPointInStructor(
298  CodeGenFunction &CGF, const CXXRecordDecl *VTableClass,
299  BaseSubobject Base, const CXXRecordDecl *NearestVBase) override;
300 
301  llvm::Constant *
302  getVTableAddressPointForConstExpr(BaseSubobject Base,
303  const CXXRecordDecl *VTableClass) override;
304 
305  llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD,
306  CharUnits VPtrOffset) override;
307 
308  CGCallee getVirtualFunctionPointer(CodeGenFunction &CGF, GlobalDecl GD,
309  Address This, llvm::Type *Ty,
310  SourceLocation Loc) override;
311 
312  llvm::Value *EmitVirtualDestructorCall(CodeGenFunction &CGF,
313  const CXXDestructorDecl *Dtor,
314  CXXDtorType DtorType, Address This,
315  DeleteOrMemberCallExpr E) override;
316 
317  void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, GlobalDecl GD,
318  CallArgList &CallArgs) override {
319  assert(GD.getDtorType() == Dtor_Deleting &&
320  "Only deleting destructor thunks are available in this ABI");
321  CallArgs.add(RValue::get(getStructorImplicitParamValue(CGF)),
322  getContext().IntTy);
323  }
324 
325  void emitVirtualInheritanceTables(const CXXRecordDecl *RD) override;
326 
327  llvm::GlobalVariable *
328  getAddrOfVBTable(const VPtrInfo &VBT, const CXXRecordDecl *RD,
329  llvm::GlobalVariable::LinkageTypes Linkage);
330 
331  llvm::GlobalVariable *
332  getAddrOfVirtualDisplacementMap(const CXXRecordDecl *SrcRD,
333  const CXXRecordDecl *DstRD) {
334  SmallString<256> OutName;
335  llvm::raw_svector_ostream Out(OutName);
336  getMangleContext().mangleCXXVirtualDisplacementMap(SrcRD, DstRD, Out);
337  StringRef MangledName = OutName.str();
338 
339  if (auto *VDispMap = CGM.getModule().getNamedGlobal(MangledName))
340  return VDispMap;
341 
342  MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
343  unsigned NumEntries = 1 + SrcRD->getNumVBases();
344  SmallVector<llvm::Constant *, 4> Map(NumEntries,
345  llvm::UndefValue::get(CGM.IntTy));
346  Map[0] = llvm::ConstantInt::get(CGM.IntTy, 0);
347  bool AnyDifferent = false;
348  for (const auto &I : SrcRD->vbases()) {
349  const CXXRecordDecl *VBase = I.getType()->getAsCXXRecordDecl();
350  if (!DstRD->isVirtuallyDerivedFrom(VBase))
351  continue;
352 
353  unsigned SrcVBIndex = VTContext.getVBTableIndex(SrcRD, VBase);
354  unsigned DstVBIndex = VTContext.getVBTableIndex(DstRD, VBase);
355  Map[SrcVBIndex] = llvm::ConstantInt::get(CGM.IntTy, DstVBIndex * 4);
356  AnyDifferent |= SrcVBIndex != DstVBIndex;
357  }
358  // This map would be useless, don't use it.
359  if (!AnyDifferent)
360  return nullptr;
361 
362  llvm::ArrayType *VDispMapTy = llvm::ArrayType::get(CGM.IntTy, Map.size());
363  llvm::Constant *Init = llvm::ConstantArray::get(VDispMapTy, Map);
364  llvm::GlobalValue::LinkageTypes Linkage =
365  SrcRD->isExternallyVisible() && DstRD->isExternallyVisible()
366  ? llvm::GlobalValue::LinkOnceODRLinkage
368  auto *VDispMap = new llvm::GlobalVariable(
369  CGM.getModule(), VDispMapTy, /*isConstant=*/true, Linkage,
370  /*Initializer=*/Init, MangledName);
371  return VDispMap;
372  }
373 
374  void emitVBTableDefinition(const VPtrInfo &VBT, const CXXRecordDecl *RD,
375  llvm::GlobalVariable *GV) const;
376 
377  void setThunkLinkage(llvm::Function *Thunk, bool ForVTable,
378  GlobalDecl GD, bool ReturnAdjustment) override {
380  getContext().GetGVALinkageForFunction(cast<FunctionDecl>(GD.getDecl()));
381 
382  if (Linkage == GVA_Internal)
383  Thunk->setLinkage(llvm::GlobalValue::InternalLinkage);
384  else if (ReturnAdjustment)
385  Thunk->setLinkage(llvm::GlobalValue::WeakODRLinkage);
386  else
387  Thunk->setLinkage(llvm::GlobalValue::LinkOnceODRLinkage);
388  }
389 
390  bool exportThunk() override { return false; }
391 
392  llvm::Value *performThisAdjustment(CodeGenFunction &CGF, Address This,
393  const ThisAdjustment &TA) override;
394 
395  llvm::Value *performReturnAdjustment(CodeGenFunction &CGF, Address Ret,
396  const ReturnAdjustment &RA) override;
397 
398  void EmitThreadLocalInitFuncs(
399  CodeGenModule &CGM, ArrayRef<const VarDecl *> CXXThreadLocals,
400  ArrayRef<llvm::Function *> CXXThreadLocalInits,
401  ArrayRef<const VarDecl *> CXXThreadLocalInitVars) override;
402 
403  bool usesThreadWrapperFunction(const VarDecl *VD) const override {
404  return false;
405  }
406  LValue EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF, const VarDecl *VD,
407  QualType LValType) override;
408 
409  void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
410  llvm::GlobalVariable *DeclPtr,
411  bool PerformInit) override;
412  void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
413  llvm::FunctionCallee Dtor,
414  llvm::Constant *Addr) override;
415 
416  // ==== Notes on array cookies =========
417  //
418  // MSVC seems to only use cookies when the class has a destructor; a
419  // two-argument usual array deallocation function isn't sufficient.
420  //
421  // For example, this code prints "100" and "1":
422  // struct A {
423  // char x;
424  // void *operator new[](size_t sz) {
425  // printf("%u\n", sz);
426  // return malloc(sz);
427  // }
428  // void operator delete[](void *p, size_t sz) {
429  // printf("%u\n", sz);
430  // free(p);
431  // }
432  // };
433  // int main() {
434  // A *p = new A[100];
435  // delete[] p;
436  // }
437  // Whereas it prints "104" and "104" if you give A a destructor.
438 
439  bool requiresArrayCookie(const CXXDeleteExpr *expr,
440  QualType elementType) override;
441  bool requiresArrayCookie(const CXXNewExpr *expr) override;
442  CharUnits getArrayCookieSizeImpl(QualType type) override;
443  Address InitializeArrayCookie(CodeGenFunction &CGF,
444  Address NewPtr,
445  llvm::Value *NumElements,
446  const CXXNewExpr *expr,
447  QualType ElementType) override;
448  llvm::Value *readArrayCookieImpl(CodeGenFunction &CGF,
449  Address allocPtr,
450  CharUnits cookieSize) override;
451 
452  friend struct MSRTTIBuilder;
453 
454  bool isImageRelative() const {
455  return CGM.getTarget().getPointerWidth(/*AddrSpace=*/0) == 64;
456  }
457 
458  // 5 routines for constructing the llvm types for MS RTTI structs.
459  llvm::StructType *getTypeDescriptorType(StringRef TypeInfoString) {
460  llvm::SmallString<32> TDTypeName("rtti.TypeDescriptor");
461  TDTypeName += llvm::utostr(TypeInfoString.size());
462  llvm::StructType *&TypeDescriptorType =
463  TypeDescriptorTypeMap[TypeInfoString.size()];
464  if (TypeDescriptorType)
465  return TypeDescriptorType;
466  llvm::Type *FieldTypes[] = {
467  CGM.Int8PtrPtrTy,
468  CGM.Int8PtrTy,
469  llvm::ArrayType::get(CGM.Int8Ty, TypeInfoString.size() + 1)};
470  TypeDescriptorType =
471  llvm::StructType::create(CGM.getLLVMContext(), FieldTypes, TDTypeName);
472  return TypeDescriptorType;
473  }
474 
475  llvm::Type *getImageRelativeType(llvm::Type *PtrType) {
476  if (!isImageRelative())
477  return PtrType;
478  return CGM.IntTy;
479  }
480 
481  llvm::StructType *getBaseClassDescriptorType() {
482  if (BaseClassDescriptorType)
483  return BaseClassDescriptorType;
484  llvm::Type *FieldTypes[] = {
485  getImageRelativeType(CGM.Int8PtrTy),
486  CGM.IntTy,
487  CGM.IntTy,
488  CGM.IntTy,
489  CGM.IntTy,
490  CGM.IntTy,
491  getImageRelativeType(getClassHierarchyDescriptorType()->getPointerTo()),
492  };
493  BaseClassDescriptorType = llvm::StructType::create(
494  CGM.getLLVMContext(), FieldTypes, "rtti.BaseClassDescriptor");
495  return BaseClassDescriptorType;
496  }
497 
498  llvm::StructType *getClassHierarchyDescriptorType() {
499  if (ClassHierarchyDescriptorType)
500  return ClassHierarchyDescriptorType;
501  // Forward-declare RTTIClassHierarchyDescriptor to break a cycle.
502  ClassHierarchyDescriptorType = llvm::StructType::create(
503  CGM.getLLVMContext(), "rtti.ClassHierarchyDescriptor");
504  llvm::Type *FieldTypes[] = {
505  CGM.IntTy,
506  CGM.IntTy,
507  CGM.IntTy,
508  getImageRelativeType(
509  getBaseClassDescriptorType()->getPointerTo()->getPointerTo()),
510  };
511  ClassHierarchyDescriptorType->setBody(FieldTypes);
512  return ClassHierarchyDescriptorType;
513  }
514 
515  llvm::StructType *getCompleteObjectLocatorType() {
516  if (CompleteObjectLocatorType)
517  return CompleteObjectLocatorType;
518  CompleteObjectLocatorType = llvm::StructType::create(
519  CGM.getLLVMContext(), "rtti.CompleteObjectLocator");
520  llvm::Type *FieldTypes[] = {
521  CGM.IntTy,
522  CGM.IntTy,
523  CGM.IntTy,
524  getImageRelativeType(CGM.Int8PtrTy),
525  getImageRelativeType(getClassHierarchyDescriptorType()->getPointerTo()),
526  getImageRelativeType(CompleteObjectLocatorType),
527  };
528  llvm::ArrayRef<llvm::Type *> FieldTypesRef(FieldTypes);
529  if (!isImageRelative())
530  FieldTypesRef = FieldTypesRef.drop_back();
531  CompleteObjectLocatorType->setBody(FieldTypesRef);
532  return CompleteObjectLocatorType;
533  }
534 
535  llvm::GlobalVariable *getImageBase() {
536  StringRef Name = "__ImageBase";
537  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(Name))
538  return GV;
539 
540  auto *GV = new llvm::GlobalVariable(CGM.getModule(), CGM.Int8Ty,
541  /*isConstant=*/true,
543  /*Initializer=*/nullptr, Name);
544  CGM.setDSOLocal(GV);
545  return GV;
546  }
547 
548  llvm::Constant *getImageRelativeConstant(llvm::Constant *PtrVal) {
549  if (!isImageRelative())
550  return PtrVal;
551 
552  if (PtrVal->isNullValue())
553  return llvm::Constant::getNullValue(CGM.IntTy);
554 
555  llvm::Constant *ImageBaseAsInt =
556  llvm::ConstantExpr::getPtrToInt(getImageBase(), CGM.IntPtrTy);
557  llvm::Constant *PtrValAsInt =
558  llvm::ConstantExpr::getPtrToInt(PtrVal, CGM.IntPtrTy);
559  llvm::Constant *Diff =
560  llvm::ConstantExpr::getSub(PtrValAsInt, ImageBaseAsInt,
561  /*HasNUW=*/true, /*HasNSW=*/true);
562  return llvm::ConstantExpr::getTrunc(Diff, CGM.IntTy);
563  }
564 
565 private:
566  MicrosoftMangleContext &getMangleContext() {
567  return cast<MicrosoftMangleContext>(CodeGen::CGCXXABI::getMangleContext());
568  }
569 
570  llvm::Constant *getZeroInt() {
571  return llvm::ConstantInt::get(CGM.IntTy, 0);
572  }
573 
574  llvm::Constant *getAllOnesInt() {
575  return llvm::Constant::getAllOnesValue(CGM.IntTy);
576  }
577 
578  CharUnits getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) override;
579 
580  void
581  GetNullMemberPointerFields(const MemberPointerType *MPT,
583 
584  /// Shared code for virtual base adjustment. Returns the offset from
585  /// the vbptr to the virtual base. Optionally returns the address of the
586  /// vbptr itself.
587  llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
588  Address Base,
589  llvm::Value *VBPtrOffset,
590  llvm::Value *VBTableOffset,
591  llvm::Value **VBPtr = nullptr);
592 
593  llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
594  Address Base,
595  int32_t VBPtrOffset,
596  int32_t VBTableOffset,
597  llvm::Value **VBPtr = nullptr) {
598  assert(VBTableOffset % 4 == 0 && "should be byte offset into table of i32s");
599  llvm::Value *VBPOffset = llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset),
600  *VBTOffset = llvm::ConstantInt::get(CGM.IntTy, VBTableOffset);
601  return GetVBaseOffsetFromVBPtr(CGF, Base, VBPOffset, VBTOffset, VBPtr);
602  }
603 
604  std::tuple<Address, llvm::Value *, const CXXRecordDecl *>
605  performBaseAdjustment(CodeGenFunction &CGF, Address Value,
606  QualType SrcRecordTy);
607 
608  /// Performs a full virtual base adjustment. Used to dereference
609  /// pointers to members of virtual bases.
610  llvm::Value *AdjustVirtualBase(CodeGenFunction &CGF, const Expr *E,
611  const CXXRecordDecl *RD, Address Base,
612  llvm::Value *VirtualBaseAdjustmentOffset,
613  llvm::Value *VBPtrOffset /* optional */);
614 
615  /// Emits a full member pointer with the fields common to data and
616  /// function member pointers.
617  llvm::Constant *EmitFullMemberPointer(llvm::Constant *FirstField,
618  bool IsMemberFunction,
619  const CXXRecordDecl *RD,
620  CharUnits NonVirtualBaseAdjustment,
621  unsigned VBTableIndex);
622 
623  bool MemberPointerConstantIsNull(const MemberPointerType *MPT,
624  llvm::Constant *MP);
625 
626  /// - Initialize all vbptrs of 'this' with RD as the complete type.
627  void EmitVBPtrStores(CodeGenFunction &CGF, const CXXRecordDecl *RD);
628 
629  /// Caching wrapper around VBTableBuilder::enumerateVBTables().
630  const VBTableGlobals &enumerateVBTables(const CXXRecordDecl *RD);
631 
632  /// Generate a thunk for calling a virtual member function MD.
633  llvm::Function *EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
634  const MethodVFTableLocation &ML);
635 
636  llvm::Constant *EmitMemberDataPointer(const CXXRecordDecl *RD,
637  CharUnits offset);
638 
639 public:
640  llvm::Type *ConvertMemberPointerType(const MemberPointerType *MPT) override;
641 
642  bool isZeroInitializable(const MemberPointerType *MPT) override;
643 
644  bool isMemberPointerConvertible(const MemberPointerType *MPT) const override {
645  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
646  return RD->hasAttr<MSInheritanceAttr>();
647  }
648 
649  llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT) override;
650 
651  llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT,
652  CharUnits offset) override;
653  llvm::Constant *EmitMemberFunctionPointer(const CXXMethodDecl *MD) override;
654  llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT) override;
655 
656  llvm::Value *EmitMemberPointerComparison(CodeGenFunction &CGF,
657  llvm::Value *L,
658  llvm::Value *R,
659  const MemberPointerType *MPT,
660  bool Inequality) override;
661 
662  llvm::Value *EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
663  llvm::Value *MemPtr,
664  const MemberPointerType *MPT) override;
665 
666  llvm::Value *
667  EmitMemberDataPointerAddress(CodeGenFunction &CGF, const Expr *E,
668  Address Base, llvm::Value *MemPtr,
669  const MemberPointerType *MPT) override;
670 
671  llvm::Value *EmitNonNullMemberPointerConversion(
672  const MemberPointerType *SrcTy, const MemberPointerType *DstTy,
675  CGBuilderTy &Builder);
676 
677  llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF,
678  const CastExpr *E,
679  llvm::Value *Src) override;
680 
681  llvm::Constant *EmitMemberPointerConversion(const CastExpr *E,
682  llvm::Constant *Src) override;
683 
684  llvm::Constant *EmitMemberPointerConversion(
685  const MemberPointerType *SrcTy, const MemberPointerType *DstTy,
687  CastExpr::path_const_iterator PathEnd, llvm::Constant *Src);
688 
689  CGCallee
690  EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF, const Expr *E,
691  Address This, llvm::Value *&ThisPtrForCall,
692  llvm::Value *MemPtr,
693  const MemberPointerType *MPT) override;
694 
695  void emitCXXStructor(GlobalDecl GD) override;
696 
697  llvm::StructType *getCatchableTypeType() {
698  if (CatchableTypeType)
699  return CatchableTypeType;
700  llvm::Type *FieldTypes[] = {
701  CGM.IntTy, // Flags
702  getImageRelativeType(CGM.Int8PtrTy), // TypeDescriptor
703  CGM.IntTy, // NonVirtualAdjustment
704  CGM.IntTy, // OffsetToVBPtr
705  CGM.IntTy, // VBTableIndex
706  CGM.IntTy, // Size
707  getImageRelativeType(CGM.Int8PtrTy) // CopyCtor
708  };
709  CatchableTypeType = llvm::StructType::create(
710  CGM.getLLVMContext(), FieldTypes, "eh.CatchableType");
711  return CatchableTypeType;
712  }
713 
714  llvm::StructType *getCatchableTypeArrayType(uint32_t NumEntries) {
715  llvm::StructType *&CatchableTypeArrayType =
716  CatchableTypeArrayTypeMap[NumEntries];
717  if (CatchableTypeArrayType)
718  return CatchableTypeArrayType;
719 
720  llvm::SmallString<23> CTATypeName("eh.CatchableTypeArray.");
721  CTATypeName += llvm::utostr(NumEntries);
722  llvm::Type *CTType =
723  getImageRelativeType(getCatchableTypeType()->getPointerTo());
724  llvm::Type *FieldTypes[] = {
725  CGM.IntTy, // NumEntries
726  llvm::ArrayType::get(CTType, NumEntries) // CatchableTypes
727  };
728  CatchableTypeArrayType =
729  llvm::StructType::create(CGM.getLLVMContext(), FieldTypes, CTATypeName);
730  return CatchableTypeArrayType;
731  }
732 
733  llvm::StructType *getThrowInfoType() {
734  if (ThrowInfoType)
735  return ThrowInfoType;
736  llvm::Type *FieldTypes[] = {
737  CGM.IntTy, // Flags
738  getImageRelativeType(CGM.Int8PtrTy), // CleanupFn
739  getImageRelativeType(CGM.Int8PtrTy), // ForwardCompat
740  getImageRelativeType(CGM.Int8PtrTy) // CatchableTypeArray
741  };
742  ThrowInfoType = llvm::StructType::create(CGM.getLLVMContext(), FieldTypes,
743  "eh.ThrowInfo");
744  return ThrowInfoType;
745  }
746 
747  llvm::FunctionCallee getThrowFn() {
748  // _CxxThrowException is passed an exception object and a ThrowInfo object
749  // which describes the exception.
750  llvm::Type *Args[] = {CGM.Int8PtrTy, getThrowInfoType()->getPointerTo()};
751  llvm::FunctionType *FTy =
752  llvm::FunctionType::get(CGM.VoidTy, Args, /*isVarArg=*/false);
753  llvm::FunctionCallee Throw =
754  CGM.CreateRuntimeFunction(FTy, "_CxxThrowException");
755  // _CxxThrowException is stdcall on 32-bit x86 platforms.
756  if (CGM.getTarget().getTriple().getArch() == llvm::Triple::x86) {
757  if (auto *Fn = dyn_cast<llvm::Function>(Throw.getCallee()))
758  Fn->setCallingConv(llvm::CallingConv::X86_StdCall);
759  }
760  return Throw;
761  }
762 
763  llvm::Function *getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
764  CXXCtorType CT);
765 
766  llvm::Constant *getCatchableType(QualType T,
767  uint32_t NVOffset = 0,
768  int32_t VBPtrOffset = -1,
769  uint32_t VBIndex = 0);
770 
771  llvm::GlobalVariable *getCatchableTypeArray(QualType T);
772 
773  llvm::GlobalVariable *getThrowInfo(QualType T) override;
774 
775  std::pair<llvm::Value *, const CXXRecordDecl *>
776  LoadVTablePtr(CodeGenFunction &CGF, Address This,
777  const CXXRecordDecl *RD) override;
778 
779  virtual bool
780  isPermittedToBeHomogeneousAggregate(const CXXRecordDecl *RD) const override;
781 
782 private:
783  typedef std::pair<const CXXRecordDecl *, CharUnits> VFTableIdTy;
784  typedef llvm::DenseMap<VFTableIdTy, llvm::GlobalVariable *> VTablesMapTy;
785  typedef llvm::DenseMap<VFTableIdTy, llvm::GlobalValue *> VFTablesMapTy;
786  /// All the vftables that have been referenced.
787  VFTablesMapTy VFTablesMap;
788  VTablesMapTy VTablesMap;
789 
790  /// This set holds the record decls we've deferred vtable emission for.
792 
793 
794  /// All the vbtables which have been referenced.
795  llvm::DenseMap<const CXXRecordDecl *, VBTableGlobals> VBTablesMap;
796 
797  /// Info on the global variable used to guard initialization of static locals.
798  /// The BitIndex field is only used for externally invisible declarations.
799  struct GuardInfo {
800  GuardInfo() : Guard(nullptr), BitIndex(0) {}
801  llvm::GlobalVariable *Guard;
802  unsigned BitIndex;
803  };
804 
805  /// Map from DeclContext to the current guard variable. We assume that the
806  /// AST is visited in source code order.
807  llvm::DenseMap<const DeclContext *, GuardInfo> GuardVariableMap;
808  llvm::DenseMap<const DeclContext *, GuardInfo> ThreadLocalGuardVariableMap;
809  llvm::DenseMap<const DeclContext *, unsigned> ThreadSafeGuardNumMap;
810 
811  llvm::DenseMap<size_t, llvm::StructType *> TypeDescriptorTypeMap;
812  llvm::StructType *BaseClassDescriptorType;
813  llvm::StructType *ClassHierarchyDescriptorType;
814  llvm::StructType *CompleteObjectLocatorType;
815 
816  llvm::DenseMap<QualType, llvm::GlobalVariable *> CatchableTypeArrays;
817 
818  llvm::StructType *CatchableTypeType;
819  llvm::DenseMap<uint32_t, llvm::StructType *> CatchableTypeArrayTypeMap;
820  llvm::StructType *ThrowInfoType;
821 };
822 
823 }
824 
827  // Use the default C calling convention rules for things that can be passed in
828  // registers, i.e. non-trivially copyable records or records marked with
829  // [[trivial_abi]].
830  if (RD->canPassInRegisters())
831  return RAA_Default;
832 
833  switch (CGM.getTarget().getTriple().getArch()) {
834  default:
835  // FIXME: Implement for other architectures.
836  return RAA_Indirect;
837 
838  case llvm::Triple::thumb:
839  // Pass things indirectly for now because it is simple.
840  // FIXME: This is incompatible with MSVC for arguments with a dtor and no
841  // copy ctor.
842  return RAA_Indirect;
843 
844  case llvm::Triple::x86: {
845  // If the argument has *required* alignment greater than four bytes, pass
846  // it indirectly. Prior to MSVC version 19.14, passing overaligned
847  // arguments was not supported and resulted in a compiler error. In 19.14
848  // and later versions, such arguments are now passed indirectly.
849  TypeInfo Info = getContext().getTypeInfo(RD->getTypeForDecl());
850  if (Info.isAlignRequired() && Info.Align > 4)
851  return RAA_Indirect;
852 
853  // If C++ prohibits us from making a copy, construct the arguments directly
854  // into argument memory.
855  return RAA_DirectInMemory;
856  }
857 
858  case llvm::Triple::x86_64:
859  case llvm::Triple::aarch64:
860  return RAA_Indirect;
861  }
862 
863  llvm_unreachable("invalid enum");
864 }
865 
866 void MicrosoftCXXABI::emitVirtualObjectDelete(CodeGenFunction &CGF,
867  const CXXDeleteExpr *DE,
868  Address Ptr,
869  QualType ElementType,
870  const CXXDestructorDecl *Dtor) {
871  // FIXME: Provide a source location here even though there's no
872  // CXXMemberCallExpr for dtor call.
873  bool UseGlobalDelete = DE->isGlobalDelete();
874  CXXDtorType DtorType = UseGlobalDelete ? Dtor_Complete : Dtor_Deleting;
875  llvm::Value *MDThis = EmitVirtualDestructorCall(CGF, Dtor, DtorType, Ptr, DE);
876  if (UseGlobalDelete)
877  CGF.EmitDeleteCall(DE->getOperatorDelete(), MDThis, ElementType);
878 }
879 
880 void MicrosoftCXXABI::emitRethrow(CodeGenFunction &CGF, bool isNoReturn) {
881  llvm::Value *Args[] = {
882  llvm::ConstantPointerNull::get(CGM.Int8PtrTy),
883  llvm::ConstantPointerNull::get(getThrowInfoType()->getPointerTo())};
884  llvm::FunctionCallee Fn = getThrowFn();
885  if (isNoReturn)
886  CGF.EmitNoreturnRuntimeCallOrInvoke(Fn, Args);
887  else
888  CGF.EmitRuntimeCallOrInvoke(Fn, Args);
889 }
890 
891 void MicrosoftCXXABI::emitBeginCatch(CodeGenFunction &CGF,
892  const CXXCatchStmt *S) {
893  // In the MS ABI, the runtime handles the copy, and the catch handler is
894  // responsible for destruction.
895  VarDecl *CatchParam = S->getExceptionDecl();
896  llvm::BasicBlock *CatchPadBB = CGF.Builder.GetInsertBlock();
897  llvm::CatchPadInst *CPI =
898  cast<llvm::CatchPadInst>(CatchPadBB->getFirstNonPHI());
899  CGF.CurrentFuncletPad = CPI;
900 
901  // If this is a catch-all or the catch parameter is unnamed, we don't need to
902  // emit an alloca to the object.
903  if (!CatchParam || !CatchParam->getDeclName()) {
904  CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI);
905  return;
906  }
907 
909  CPI->setArgOperand(2, var.getObjectAddress(CGF).getPointer());
910  CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI);
911  CGF.EmitAutoVarCleanups(var);
912 }
913 
914 /// We need to perform a generic polymorphic operation (like a typeid
915 /// or a cast), which requires an object with a vfptr. Adjust the
916 /// address to point to an object with a vfptr.
917 std::tuple<Address, llvm::Value *, const CXXRecordDecl *>
918 MicrosoftCXXABI::performBaseAdjustment(CodeGenFunction &CGF, Address Value,
919  QualType SrcRecordTy) {
921  const CXXRecordDecl *SrcDecl = SrcRecordTy->getAsCXXRecordDecl();
922  const ASTContext &Context = getContext();
923 
924  // If the class itself has a vfptr, great. This check implicitly
925  // covers non-virtual base subobjects: a class with its own virtual
926  // functions would be a candidate to be a primary base.
927  if (Context.getASTRecordLayout(SrcDecl).hasExtendableVFPtr())
928  return std::make_tuple(Value, llvm::ConstantInt::get(CGF.Int32Ty, 0),
929  SrcDecl);
930 
931  // Okay, one of the vbases must have a vfptr, or else this isn't
932  // actually a polymorphic class.
933  const CXXRecordDecl *PolymorphicBase = nullptr;
934  for (auto &Base : SrcDecl->vbases()) {
935  const CXXRecordDecl *BaseDecl = Base.getType()->getAsCXXRecordDecl();
936  if (Context.getASTRecordLayout(BaseDecl).hasExtendableVFPtr()) {
937  PolymorphicBase = BaseDecl;
938  break;
939  }
940  }
941  assert(PolymorphicBase && "polymorphic class has no apparent vfptr?");
942 
944  GetVirtualBaseClassOffset(CGF, Value, SrcDecl, PolymorphicBase);
945  llvm::Value *Ptr = CGF.Builder.CreateInBoundsGEP(
946  Value.getElementType(), Value.getPointer(), Offset);
947  CharUnits VBaseAlign =
948  CGF.CGM.getVBaseAlignment(Value.getAlignment(), SrcDecl, PolymorphicBase);
949  return std::make_tuple(Address(Ptr, VBaseAlign), Offset, PolymorphicBase);
950 }
951 
952 bool MicrosoftCXXABI::shouldTypeidBeNullChecked(bool IsDeref,
953  QualType SrcRecordTy) {
954  const CXXRecordDecl *SrcDecl = SrcRecordTy->getAsCXXRecordDecl();
955  return IsDeref &&
956  !getContext().getASTRecordLayout(SrcDecl).hasExtendableVFPtr();
957 }
958 
959 static llvm::CallBase *emitRTtypeidCall(CodeGenFunction &CGF,
960  llvm::Value *Argument) {
961  llvm::Type *ArgTypes[] = {CGF.Int8PtrTy};
962  llvm::FunctionType *FTy =
963  llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false);
964  llvm::Value *Args[] = {Argument};
965  llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(FTy, "__RTtypeid");
966  return CGF.EmitRuntimeCallOrInvoke(Fn, Args);
967 }
968 
969 void MicrosoftCXXABI::EmitBadTypeidCall(CodeGenFunction &CGF) {
970  llvm::CallBase *Call =
971  emitRTtypeidCall(CGF, llvm::Constant::getNullValue(CGM.VoidPtrTy));
972  Call->setDoesNotReturn();
973  CGF.Builder.CreateUnreachable();
974 }
975 
976 llvm::Value *MicrosoftCXXABI::EmitTypeid(CodeGenFunction &CGF,
977  QualType SrcRecordTy,
978  Address ThisPtr,
979  llvm::Type *StdTypeInfoPtrTy) {
980  std::tie(ThisPtr, std::ignore, std::ignore) =
981  performBaseAdjustment(CGF, ThisPtr, SrcRecordTy);
982  llvm::CallBase *Typeid = emitRTtypeidCall(CGF, ThisPtr.getPointer());
983  return CGF.Builder.CreateBitCast(Typeid, StdTypeInfoPtrTy);
984 }
985 
986 bool MicrosoftCXXABI::shouldDynamicCastCallBeNullChecked(bool SrcIsPtr,
987  QualType SrcRecordTy) {
988  const CXXRecordDecl *SrcDecl = SrcRecordTy->getAsCXXRecordDecl();
989  return SrcIsPtr &&
990  !getContext().getASTRecordLayout(SrcDecl).hasExtendableVFPtr();
991 }
992 
993 llvm::Value *MicrosoftCXXABI::EmitDynamicCastCall(
994  CodeGenFunction &CGF, Address This, QualType SrcRecordTy,
995  QualType DestTy, QualType DestRecordTy, llvm::BasicBlock *CastEnd) {
996  llvm::Type *DestLTy = CGF.ConvertType(DestTy);
997 
998  llvm::Value *SrcRTTI =
1000  llvm::Value *DestRTTI =
1001  CGF.CGM.GetAddrOfRTTIDescriptor(DestRecordTy.getUnqualifiedType());
1002 
1004  std::tie(This, Offset, std::ignore) =
1005  performBaseAdjustment(CGF, This, SrcRecordTy);
1006  llvm::Value *ThisPtr = This.getPointer();
1007  Offset = CGF.Builder.CreateTrunc(Offset, CGF.Int32Ty);
1008 
1009  // PVOID __RTDynamicCast(
1010  // PVOID inptr,
1011  // LONG VfDelta,
1012  // PVOID SrcType,
1013  // PVOID TargetType,
1014  // BOOL isReference)
1015  llvm::Type *ArgTypes[] = {CGF.Int8PtrTy, CGF.Int32Ty, CGF.Int8PtrTy,
1016  CGF.Int8PtrTy, CGF.Int32Ty};
1017  llvm::FunctionCallee Function = CGF.CGM.CreateRuntimeFunction(
1018  llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false),
1019  "__RTDynamicCast");
1020  llvm::Value *Args[] = {
1021  ThisPtr, Offset, SrcRTTI, DestRTTI,
1022  llvm::ConstantInt::get(CGF.Int32Ty, DestTy->isReferenceType())};
1023  ThisPtr = CGF.EmitRuntimeCallOrInvoke(Function, Args);
1024  return CGF.Builder.CreateBitCast(ThisPtr, DestLTy);
1025 }
1026 
1027 llvm::Value *
1028 MicrosoftCXXABI::EmitDynamicCastToVoid(CodeGenFunction &CGF, Address Value,
1029  QualType SrcRecordTy,
1030  QualType DestTy) {
1031  std::tie(Value, std::ignore, std::ignore) =
1032  performBaseAdjustment(CGF, Value, SrcRecordTy);
1033 
1034  // PVOID __RTCastToVoid(
1035  // PVOID inptr)
1036  llvm::Type *ArgTypes[] = {CGF.Int8PtrTy};
1037  llvm::FunctionCallee Function = CGF.CGM.CreateRuntimeFunction(
1038  llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false),
1039  "__RTCastToVoid");
1040  llvm::Value *Args[] = {Value.getPointer()};
1041  return CGF.EmitRuntimeCall(Function, Args);
1042 }
1043 
1044 bool MicrosoftCXXABI::EmitBadCastCall(CodeGenFunction &CGF) {
1045  return false;
1046 }
1047 
1048 llvm::Value *MicrosoftCXXABI::GetVirtualBaseClassOffset(
1049  CodeGenFunction &CGF, Address This, const CXXRecordDecl *ClassDecl,
1050  const CXXRecordDecl *BaseClassDecl) {
1051  const ASTContext &Context = getContext();
1052  int64_t VBPtrChars =
1053  Context.getASTRecordLayout(ClassDecl).getVBPtrOffset().getQuantity();
1054  llvm::Value *VBPtrOffset = llvm::ConstantInt::get(CGM.PtrDiffTy, VBPtrChars);
1055  CharUnits IntSize = Context.getTypeSizeInChars(Context.IntTy);
1056  CharUnits VBTableChars =
1057  IntSize *
1058  CGM.getMicrosoftVTableContext().getVBTableIndex(ClassDecl, BaseClassDecl);
1059  llvm::Value *VBTableOffset =
1060  llvm::ConstantInt::get(CGM.IntTy, VBTableChars.getQuantity());
1061 
1062  llvm::Value *VBPtrToNewBase =
1063  GetVBaseOffsetFromVBPtr(CGF, This, VBPtrOffset, VBTableOffset);
1064  VBPtrToNewBase =
1065  CGF.Builder.CreateSExtOrBitCast(VBPtrToNewBase, CGM.PtrDiffTy);
1066  return CGF.Builder.CreateNSWAdd(VBPtrOffset, VBPtrToNewBase);
1067 }
1068 
1069 bool MicrosoftCXXABI::HasThisReturn(GlobalDecl GD) const {
1070  return isa<CXXConstructorDecl>(GD.getDecl());
1071 }
1072 
1073 static bool isDeletingDtor(GlobalDecl GD) {
1074  return isa<CXXDestructorDecl>(GD.getDecl()) &&
1075  GD.getDtorType() == Dtor_Deleting;
1076 }
1077 
1078 bool MicrosoftCXXABI::hasMostDerivedReturn(GlobalDecl GD) const {
1079  return isDeletingDtor(GD);
1080 }
1081 
1082 static bool isTrivialForAArch64MSVC(const CXXRecordDecl *RD) {
1083  // For AArch64, we use the C++14 definition of an aggregate, so we also
1084  // check for:
1085  // No private or protected non static data members.
1086  // No base classes
1087  // No virtual functions
1088  // Additionally, we need to ensure that there is a trivial copy assignment
1089  // operator, a trivial destructor and no user-provided constructors.
1090  if (RD->hasProtectedFields() || RD->hasPrivateFields())
1091  return false;
1092  if (RD->getNumBases() > 0)
1093  return false;
1094  if (RD->isPolymorphic())
1095  return false;
1096  if (RD->hasNonTrivialCopyAssignment())
1097  return false;
1098  for (const CXXConstructorDecl *Ctor : RD->ctors())
1099  if (Ctor->isUserProvided())
1100  return false;
1101  if (RD->hasNonTrivialDestructor())
1102  return false;
1103  return true;
1104 }
1105 
1107  const CXXRecordDecl *RD = FI.getReturnType()->getAsCXXRecordDecl();
1108  if (!RD)
1109  return false;
1110 
1111  // Normally, the C++ concept of "is trivially copyable" is used to determine
1112  // if a struct can be returned directly. However, as MSVC and the language
1113  // have evolved, the definition of "trivially copyable" has changed, while the
1114  // ABI must remain stable. AArch64 uses the C++14 concept of an "aggregate",
1115  // while other ISAs use the older concept of "plain old data".
1116  bool isTrivialForABI = RD->isPOD();
1117  bool isAArch64 = CGM.getTarget().getTriple().isAArch64();
1118  if (isAArch64)
1119  isTrivialForABI = RD->canPassInRegisters() && isTrivialForAArch64MSVC(RD);
1120 
1121  // MSVC always returns structs indirectly from C++ instance methods.
1122  bool isIndirectReturn = !isTrivialForABI || FI.isInstanceMethod();
1123 
1124  if (isIndirectReturn) {
1125  CharUnits Align = CGM.getContext().getTypeAlignInChars(FI.getReturnType());
1126  FI.getReturnInfo() = ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
1127 
1128  // MSVC always passes `this` before the `sret` parameter.
1130 
1131  // On AArch64, use the `inreg` attribute if the object is considered to not
1132  // be trivially copyable, or if this is an instance method struct return.
1133  FI.getReturnInfo().setInReg(isAArch64);
1134 
1135  return true;
1136  }
1137 
1138  // Otherwise, use the C ABI rules.
1139  return false;
1140 }
1141 
1142 llvm::BasicBlock *
1143 MicrosoftCXXABI::EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
1144  const CXXRecordDecl *RD) {
1145  llvm::Value *IsMostDerivedClass = getStructorImplicitParamValue(CGF);
1146  assert(IsMostDerivedClass &&
1147  "ctor for a class with virtual bases must have an implicit parameter");
1148  llvm::Value *IsCompleteObject =
1149  CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
1150 
1151  llvm::BasicBlock *CallVbaseCtorsBB = CGF.createBasicBlock("ctor.init_vbases");
1152  llvm::BasicBlock *SkipVbaseCtorsBB = CGF.createBasicBlock("ctor.skip_vbases");
1153  CGF.Builder.CreateCondBr(IsCompleteObject,
1154  CallVbaseCtorsBB, SkipVbaseCtorsBB);
1155 
1156  CGF.EmitBlock(CallVbaseCtorsBB);
1157 
1158  // Fill in the vbtable pointers here.
1159  EmitVBPtrStores(CGF, RD);
1160 
1161  // CGF will put the base ctor calls in this basic block for us later.
1162 
1163  return SkipVbaseCtorsBB;
1164 }
1165 
1166 llvm::BasicBlock *
1167 MicrosoftCXXABI::EmitDtorCompleteObjectHandler(CodeGenFunction &CGF) {
1168  llvm::Value *IsMostDerivedClass = getStructorImplicitParamValue(CGF);
1169  assert(IsMostDerivedClass &&
1170  "ctor for a class with virtual bases must have an implicit parameter");
1171  llvm::Value *IsCompleteObject =
1172  CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
1173 
1174  llvm::BasicBlock *CallVbaseDtorsBB = CGF.createBasicBlock("Dtor.dtor_vbases");
1175  llvm::BasicBlock *SkipVbaseDtorsBB = CGF.createBasicBlock("Dtor.skip_vbases");
1176  CGF.Builder.CreateCondBr(IsCompleteObject,
1177  CallVbaseDtorsBB, SkipVbaseDtorsBB);
1178 
1179  CGF.EmitBlock(CallVbaseDtorsBB);
1180  // CGF will put the base dtor calls in this basic block for us later.
1181 
1182  return SkipVbaseDtorsBB;
1183 }
1184 
1185 void MicrosoftCXXABI::initializeHiddenVirtualInheritanceMembers(
1186  CodeGenFunction &CGF, const CXXRecordDecl *RD) {
1187  // In most cases, an override for a vbase virtual method can adjust
1188  // the "this" parameter by applying a constant offset.
1189  // However, this is not enough while a constructor or a destructor of some
1190  // class X is being executed if all the following conditions are met:
1191  // - X has virtual bases, (1)
1192  // - X overrides a virtual method M of a vbase Y, (2)
1193  // - X itself is a vbase of the most derived class.
1194  //
1195  // If (1) and (2) are true, the vtorDisp for vbase Y is a hidden member of X
1196  // which holds the extra amount of "this" adjustment we must do when we use
1197  // the X vftables (i.e. during X ctor or dtor).
1198  // Outside the ctors and dtors, the values of vtorDisps are zero.
1199 
1200  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
1201  typedef ASTRecordLayout::VBaseOffsetsMapTy VBOffsets;
1202  const VBOffsets &VBaseMap = Layout.getVBaseOffsetsMap();
1203  CGBuilderTy &Builder = CGF.Builder;
1204 
1205  unsigned AS = getThisAddress(CGF).getAddressSpace();
1206  llvm::Value *Int8This = nullptr; // Initialize lazily.
1207 
1208  for (const CXXBaseSpecifier &S : RD->vbases()) {
1209  const CXXRecordDecl *VBase = S.getType()->getAsCXXRecordDecl();
1210  auto I = VBaseMap.find(VBase);
1211  assert(I != VBaseMap.end());
1212  if (!I->second.hasVtorDisp())
1213  continue;
1214 
1215  llvm::Value *VBaseOffset =
1216  GetVirtualBaseClassOffset(CGF, getThisAddress(CGF), RD, VBase);
1217  uint64_t ConstantVBaseOffset = I->second.VBaseOffset.getQuantity();
1218 
1219  // vtorDisp_for_vbase = vbptr[vbase_idx] - offsetof(RD, vbase).
1220  llvm::Value *VtorDispValue = Builder.CreateSub(
1221  VBaseOffset, llvm::ConstantInt::get(CGM.PtrDiffTy, ConstantVBaseOffset),
1222  "vtordisp.value");
1223  VtorDispValue = Builder.CreateTruncOrBitCast(VtorDispValue, CGF.Int32Ty);
1224 
1225  if (!Int8This)
1226  Int8This = Builder.CreateBitCast(getThisValue(CGF),
1227  CGF.Int8Ty->getPointerTo(AS));
1228  llvm::Value *VtorDispPtr =
1229  Builder.CreateInBoundsGEP(CGF.Int8Ty, Int8This, VBaseOffset);
1230  // vtorDisp is always the 32-bits before the vbase in the class layout.
1231  VtorDispPtr = Builder.CreateConstGEP1_32(CGF.Int8Ty, VtorDispPtr, -4);
1232  VtorDispPtr = Builder.CreateBitCast(
1233  VtorDispPtr, CGF.Int32Ty->getPointerTo(AS), "vtordisp.ptr");
1234 
1235  Builder.CreateAlignedStore(VtorDispValue, VtorDispPtr,
1237  }
1238 }
1239 
1240 static bool hasDefaultCXXMethodCC(ASTContext &Context,
1241  const CXXMethodDecl *MD) {
1242  CallingConv ExpectedCallingConv = Context.getDefaultCallingConvention(
1243  /*IsVariadic=*/false, /*IsCXXMethod=*/true);
1244  CallingConv ActualCallingConv =
1245  MD->getType()->castAs<FunctionProtoType>()->getCallConv();
1246  return ExpectedCallingConv == ActualCallingConv;
1247 }
1248 
1249 void MicrosoftCXXABI::EmitCXXConstructors(const CXXConstructorDecl *D) {
1250  // There's only one constructor type in this ABI.
1251  CGM.EmitGlobal(GlobalDecl(D, Ctor_Complete));
1252 
1253  // Exported default constructors either have a simple call-site where they use
1254  // the typical calling convention and have a single 'this' pointer for an
1255  // argument -or- they get a wrapper function which appropriately thunks to the
1256  // real default constructor. This thunk is the default constructor closure.
1257  if (D->hasAttr<DLLExportAttr>() && D->isDefaultConstructor() &&
1258  D->isDefined()) {
1259  if (!hasDefaultCXXMethodCC(getContext(), D) || D->getNumParams() != 0) {
1260  llvm::Function *Fn = getAddrOfCXXCtorClosure(D, Ctor_DefaultClosure);
1261  Fn->setLinkage(llvm::GlobalValue::WeakODRLinkage);
1262  CGM.setGVProperties(Fn, D);
1263  }
1264  }
1265 }
1266 
1267 void MicrosoftCXXABI::EmitVBPtrStores(CodeGenFunction &CGF,
1268  const CXXRecordDecl *RD) {
1269  Address This = getThisAddress(CGF);
1270  This = CGF.Builder.CreateElementBitCast(This, CGM.Int8Ty, "this.int8");
1271  const ASTContext &Context = getContext();
1272  const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
1273 
1274  const VBTableGlobals &VBGlobals = enumerateVBTables(RD);
1275  for (unsigned I = 0, E = VBGlobals.VBTables->size(); I != E; ++I) {
1276  const std::unique_ptr<VPtrInfo> &VBT = (*VBGlobals.VBTables)[I];
1277  llvm::GlobalVariable *GV = VBGlobals.Globals[I];
1278  const ASTRecordLayout &SubobjectLayout =
1279  Context.getASTRecordLayout(VBT->IntroducingObject);
1280  CharUnits Offs = VBT->NonVirtualOffset;
1281  Offs += SubobjectLayout.getVBPtrOffset();
1282  if (VBT->getVBaseWithVPtr())
1283  Offs += Layout.getVBaseClassOffset(VBT->getVBaseWithVPtr());
1284  Address VBPtr = CGF.Builder.CreateConstInBoundsByteGEP(This, Offs);
1285  llvm::Value *GVPtr =
1286  CGF.Builder.CreateConstInBoundsGEP2_32(GV->getValueType(), GV, 0, 0);
1287  VBPtr = CGF.Builder.CreateElementBitCast(VBPtr, GVPtr->getType(),
1288  "vbptr." + VBT->ObjectWithVPtr->getName());
1289  CGF.Builder.CreateStore(GVPtr, VBPtr);
1290  }
1291 }
1292 
1294 MicrosoftCXXABI::buildStructorSignature(GlobalDecl GD,
1295  SmallVectorImpl<CanQualType> &ArgTys) {
1296  AddedStructorArgCounts Added;
1297  // TODO: 'for base' flag
1298  if (isa<CXXDestructorDecl>(GD.getDecl()) &&
1299  GD.getDtorType() == Dtor_Deleting) {
1300  // The scalar deleting destructor takes an implicit int parameter.
1301  ArgTys.push_back(getContext().IntTy);
1302  ++Added.Suffix;
1303  }
1304  auto *CD = dyn_cast<CXXConstructorDecl>(GD.getDecl());
1305  if (!CD)
1306  return Added;
1307 
1308  // All parameters are already in place except is_most_derived, which goes
1309  // after 'this' if it's variadic and last if it's not.
1310 
1311  const CXXRecordDecl *Class = CD->getParent();
1312  const FunctionProtoType *FPT = CD->getType()->castAs<FunctionProtoType>();
1313  if (Class->getNumVBases()) {
1314  if (FPT->isVariadic()) {
1315  ArgTys.insert(ArgTys.begin() + 1, getContext().IntTy);
1316  ++Added.Prefix;
1317  } else {
1318  ArgTys.push_back(getContext().IntTy);
1319  ++Added.Suffix;
1320  }
1321  }
1322 
1323  return Added;
1324 }
1325 
1326 void MicrosoftCXXABI::setCXXDestructorDLLStorage(llvm::GlobalValue *GV,
1327  const CXXDestructorDecl *Dtor,
1328  CXXDtorType DT) const {
1329  // Deleting destructor variants are never imported or exported. Give them the
1330  // default storage class.
1331  if (DT == Dtor_Deleting) {
1332  GV->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1333  } else {
1334  const NamedDecl *ND = Dtor;
1335  CGM.setDLLImportDLLExport(GV, ND);
1336  }
1337 }
1338 
1339 llvm::GlobalValue::LinkageTypes MicrosoftCXXABI::getCXXDestructorLinkage(
1340  GVALinkage Linkage, const CXXDestructorDecl *Dtor, CXXDtorType DT) const {
1341  // Internal things are always internal, regardless of attributes. After this,
1342  // we know the thunk is externally visible.
1343  if (Linkage == GVA_Internal)
1345 
1346  switch (DT) {
1347  case Dtor_Base:
1348  // The base destructor most closely tracks the user-declared constructor, so
1349  // we delegate back to the normal declarator case.
1350  return CGM.getLLVMLinkageForDeclarator(Dtor, Linkage,
1351  /*IsConstantVariable=*/false);
1352  case Dtor_Complete:
1353  // The complete destructor is like an inline function, but it may be
1354  // imported and therefore must be exported as well. This requires changing
1355  // the linkage if a DLL attribute is present.
1356  if (Dtor->hasAttr<DLLExportAttr>())
1357  return llvm::GlobalValue::WeakODRLinkage;
1358  if (Dtor->hasAttr<DLLImportAttr>())
1359  return llvm::GlobalValue::AvailableExternallyLinkage;
1360  return llvm::GlobalValue::LinkOnceODRLinkage;
1361  case Dtor_Deleting:
1362  // Deleting destructors are like inline functions. They have vague linkage
1363  // and are emitted everywhere they are used. They are internal if the class
1364  // is internal.
1365  return llvm::GlobalValue::LinkOnceODRLinkage;
1366  case Dtor_Comdat:
1367  llvm_unreachable("MS C++ ABI does not support comdat dtors");
1368  }
1369  llvm_unreachable("invalid dtor type");
1370 }
1371 
1372 void MicrosoftCXXABI::EmitCXXDestructors(const CXXDestructorDecl *D) {
1373  // The TU defining a dtor is only guaranteed to emit a base destructor. All
1374  // other destructor variants are delegating thunks.
1375  CGM.EmitGlobal(GlobalDecl(D, Dtor_Base));
1376 
1377  // If the class is dllexported, emit the complete (vbase) destructor wherever
1378  // the base dtor is emitted.
1379  // FIXME: To match MSVC, this should only be done when the class is exported
1380  // with -fdllexport-inlines enabled.
1381  if (D->getParent()->getNumVBases() > 0 && D->hasAttr<DLLExportAttr>())
1382  CGM.EmitGlobal(GlobalDecl(D, Dtor_Complete));
1383 }
1384 
1385 CharUnits
1386 MicrosoftCXXABI::getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) {
1387  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
1388 
1389  if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
1390  // Complete destructors take a pointer to the complete object as a
1391  // parameter, thus don't need this adjustment.
1392  if (GD.getDtorType() == Dtor_Complete)
1393  return CharUnits();
1394 
1395  // There's no Dtor_Base in vftable but it shares the this adjustment with
1396  // the deleting one, so look it up instead.
1397  GD = GlobalDecl(DD, Dtor_Deleting);
1398  }
1399 
1401  CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
1402  CharUnits Adjustment = ML.VFPtrOffset;
1403 
1404  // Normal virtual instance methods need to adjust from the vfptr that first
1405  // defined the virtual method to the virtual base subobject, but destructors
1406  // do not. The vector deleting destructor thunk applies this adjustment for
1407  // us if necessary.
1408  if (isa<CXXDestructorDecl>(MD))
1409  Adjustment = CharUnits::Zero();
1410 
1411  if (ML.VBase) {
1412  const ASTRecordLayout &DerivedLayout =
1413  getContext().getASTRecordLayout(MD->getParent());
1414  Adjustment += DerivedLayout.getVBaseClassOffset(ML.VBase);
1415  }
1416 
1417  return Adjustment;
1418 }
1419 
1420 Address MicrosoftCXXABI::adjustThisArgumentForVirtualFunctionCall(
1422  bool VirtualCall) {
1423  if (!VirtualCall) {
1424  // If the call of a virtual function is not virtual, we just have to
1425  // compensate for the adjustment the virtual function does in its prologue.
1426  CharUnits Adjustment = getVirtualFunctionPrologueThisAdjustment(GD);
1427  if (Adjustment.isZero())
1428  return This;
1429 
1431  assert(Adjustment.isPositive());
1432  return CGF.Builder.CreateConstByteGEP(This, Adjustment);
1433  }
1434 
1435  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
1436 
1437  GlobalDecl LookupGD = GD;
1438  if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
1439  // Complete dtors take a pointer to the complete object,
1440  // thus don't need adjustment.
1441  if (GD.getDtorType() == Dtor_Complete)
1442  return This;
1443 
1444  // There's only Dtor_Deleting in vftable but it shares the this adjustment
1445  // with the base one, so look up the deleting one instead.
1446  LookupGD = GlobalDecl(DD, Dtor_Deleting);
1447  }
1449  CGM.getMicrosoftVTableContext().getMethodVFTableLocation(LookupGD);
1450 
1451  CharUnits StaticOffset = ML.VFPtrOffset;
1452 
1453  // Base destructors expect 'this' to point to the beginning of the base
1454  // subobject, not the first vfptr that happens to contain the virtual dtor.
1455  // However, we still need to apply the virtual base adjustment.
1456  if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base)
1457  StaticOffset = CharUnits::Zero();
1458 
1459  Address Result = This;
1460  if (ML.VBase) {
1461  Result = CGF.Builder.CreateElementBitCast(Result, CGF.Int8Ty);
1462 
1463  const CXXRecordDecl *Derived = MD->getParent();
1464  const CXXRecordDecl *VBase = ML.VBase;
1465  llvm::Value *VBaseOffset =
1466  GetVirtualBaseClassOffset(CGF, Result, Derived, VBase);
1467  llvm::Value *VBasePtr = CGF.Builder.CreateInBoundsGEP(
1468  Result.getElementType(), Result.getPointer(), VBaseOffset);
1469  CharUnits VBaseAlign =
1470  CGF.CGM.getVBaseAlignment(Result.getAlignment(), Derived, VBase);
1471  Result = Address(VBasePtr, VBaseAlign);
1472  }
1473  if (!StaticOffset.isZero()) {
1474  assert(StaticOffset.isPositive());
1475  Result = CGF.Builder.CreateElementBitCast(Result, CGF.Int8Ty);
1476  if (ML.VBase) {
1477  // Non-virtual adjustment might result in a pointer outside the allocated
1478  // object, e.g. if the final overrider class is laid out after the virtual
1479  // base that declares a method in the most derived class.
1480  // FIXME: Update the code that emits this adjustment in thunks prologues.
1481  Result = CGF.Builder.CreateConstByteGEP(Result, StaticOffset);
1482  } else {
1483  Result = CGF.Builder.CreateConstInBoundsByteGEP(Result, StaticOffset);
1484  }
1485  }
1486  return Result;
1487 }
1488 
1489 void MicrosoftCXXABI::addImplicitStructorParams(CodeGenFunction &CGF,
1490  QualType &ResTy,
1491  FunctionArgList &Params) {
1492  ASTContext &Context = getContext();
1493  const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
1494  assert(isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD));
1495  if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
1496  auto *IsMostDerived = ImplicitParamDecl::Create(
1497  Context, /*DC=*/nullptr, CGF.CurGD.getDecl()->getLocation(),
1498  &Context.Idents.get("is_most_derived"), Context.IntTy,
1500  // The 'most_derived' parameter goes second if the ctor is variadic and last
1501  // if it's not. Dtors can't be variadic.
1502  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
1503  if (FPT->isVariadic())
1504  Params.insert(Params.begin() + 1, IsMostDerived);
1505  else
1506  Params.push_back(IsMostDerived);
1507  getStructorImplicitParamDecl(CGF) = IsMostDerived;
1508  } else if (isDeletingDtor(CGF.CurGD)) {
1509  auto *ShouldDelete = ImplicitParamDecl::Create(
1510  Context, /*DC=*/nullptr, CGF.CurGD.getDecl()->getLocation(),
1511  &Context.Idents.get("should_call_delete"), Context.IntTy,
1513  Params.push_back(ShouldDelete);
1514  getStructorImplicitParamDecl(CGF) = ShouldDelete;
1515  }
1516 }
1517 
1518 void MicrosoftCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
1519  // Naked functions have no prolog.
1520  if (CGF.CurFuncDecl && CGF.CurFuncDecl->hasAttr<NakedAttr>())
1521  return;
1522 
1523  // Overridden virtual methods of non-primary bases need to adjust the incoming
1524  // 'this' pointer in the prologue. In this hierarchy, C::b will subtract
1525  // sizeof(void*) to adjust from B* to C*:
1526  // struct A { virtual void a(); };
1527  // struct B { virtual void b(); };
1528  // struct C : A, B { virtual void b(); };
1529  //
1530  // Leave the value stored in the 'this' alloca unadjusted, so that the
1531  // debugger sees the unadjusted value. Microsoft debuggers require this, and
1532  // will apply the ThisAdjustment in the method type information.
1533  // FIXME: Do something better for DWARF debuggers, which won't expect this,
1534  // without making our codegen depend on debug info settings.
1535  llvm::Value *This = loadIncomingCXXThis(CGF);
1536  const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
1537  if (!CGF.CurFuncIsThunk && MD->isVirtual()) {
1538  CharUnits Adjustment = getVirtualFunctionPrologueThisAdjustment(CGF.CurGD);
1539  if (!Adjustment.isZero()) {
1540  unsigned AS = cast<llvm::PointerType>(This->getType())->getAddressSpace();
1541  llvm::Type *charPtrTy = CGF.Int8Ty->getPointerTo(AS),
1542  *thisTy = This->getType();
1543  This = CGF.Builder.CreateBitCast(This, charPtrTy);
1544  assert(Adjustment.isPositive());
1545  This = CGF.Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, This,
1546  -Adjustment.getQuantity());
1547  This = CGF.Builder.CreateBitCast(This, thisTy, "this.adjusted");
1548  }
1549  }
1550  setCXXABIThisValue(CGF, This);
1551 
1552  // If this is a function that the ABI specifies returns 'this', initialize
1553  // the return slot to 'this' at the start of the function.
1554  //
1555  // Unlike the setting of return types, this is done within the ABI
1556  // implementation instead of by clients of CGCXXABI because:
1557  // 1) getThisValue is currently protected
1558  // 2) in theory, an ABI could implement 'this' returns some other way;
1559  // HasThisReturn only specifies a contract, not the implementation
1560  if (HasThisReturn(CGF.CurGD))
1561  CGF.Builder.CreateStore(getThisValue(CGF), CGF.ReturnValue);
1562  else if (hasMostDerivedReturn(CGF.CurGD))
1563  CGF.Builder.CreateStore(CGF.EmitCastToVoidPtr(getThisValue(CGF)),
1564  CGF.ReturnValue);
1565 
1566  if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
1567  assert(getStructorImplicitParamDecl(CGF) &&
1568  "no implicit parameter for a constructor with virtual bases?");
1569  getStructorImplicitParamValue(CGF)
1570  = CGF.Builder.CreateLoad(
1571  CGF.GetAddrOfLocalVar(getStructorImplicitParamDecl(CGF)),
1572  "is_most_derived");
1573  }
1574 
1575  if (isDeletingDtor(CGF.CurGD)) {
1576  assert(getStructorImplicitParamDecl(CGF) &&
1577  "no implicit parameter for a deleting destructor?");
1578  getStructorImplicitParamValue(CGF)
1579  = CGF.Builder.CreateLoad(
1580  CGF.GetAddrOfLocalVar(getStructorImplicitParamDecl(CGF)),
1581  "should_call_delete");
1582  }
1583 }
1584 
1585 CGCXXABI::AddedStructorArgs MicrosoftCXXABI::getImplicitConstructorArgs(
1587  bool ForVirtualBase, bool Delegating) {
1588  assert(Type == Ctor_Complete || Type == Ctor_Base);
1589 
1590  // Check if we need a 'most_derived' parameter.
1591  if (!D->getParent()->getNumVBases())
1592  return AddedStructorArgs{};
1593 
1594  // Add the 'most_derived' argument second if we are variadic or last if not.
1595  const FunctionProtoType *FPT = D->getType()->castAs<FunctionProtoType>();
1596  llvm::Value *MostDerivedArg;
1597  if (Delegating) {
1598  MostDerivedArg = getStructorImplicitParamValue(CGF);
1599  } else {
1600  MostDerivedArg = llvm::ConstantInt::get(CGM.Int32Ty, Type == Ctor_Complete);
1601  }
1602  if (FPT->isVariadic()) {
1603  return AddedStructorArgs::prefix({{MostDerivedArg, getContext().IntTy}});
1604  }
1605  return AddedStructorArgs::suffix({{MostDerivedArg, getContext().IntTy}});
1606 }
1607 
1610  bool ForVirtualBase, bool Delegating) {
1611  return nullptr;
1612 }
1613 
1614 void MicrosoftCXXABI::EmitDestructorCall(CodeGenFunction &CGF,
1615  const CXXDestructorDecl *DD,
1616  CXXDtorType Type, bool ForVirtualBase,
1617  bool Delegating, Address This,
1618  QualType ThisTy) {
1619  // Use the base destructor variant in place of the complete destructor variant
1620  // if the class has no virtual bases. This effectively implements some of the
1621  // -mconstructor-aliases optimization, but as part of the MS C++ ABI.
1622  if (Type == Dtor_Complete && DD->getParent()->getNumVBases() == 0)
1623  Type = Dtor_Base;
1624 
1625  GlobalDecl GD(DD, Type);
1626  CGCallee Callee = CGCallee::forDirect(CGM.getAddrOfCXXStructor(GD), GD);
1627 
1628  if (DD->isVirtual()) {
1629  assert(Type != CXXDtorType::Dtor_Deleting &&
1630  "The deleting destructor should only be called via a virtual call");
1631  This = adjustThisArgumentForVirtualFunctionCall(CGF, GlobalDecl(DD, Type),
1632  This, false);
1633  }
1634 
1635  llvm::BasicBlock *BaseDtorEndBB = nullptr;
1636  if (ForVirtualBase && isa<CXXConstructorDecl>(CGF.CurCodeDecl)) {
1637  BaseDtorEndBB = EmitDtorCompleteObjectHandler(CGF);
1638  }
1639 
1641  getCXXDestructorImplicitParam(CGF, DD, Type, ForVirtualBase,
1642  Delegating); // = nullptr
1643  CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(), ThisTy,
1644  /*ImplicitParam=*/Implicit,
1645  /*ImplicitParamTy=*/QualType(), nullptr);
1646  if (BaseDtorEndBB) {
1647  // Complete object handler should continue to be the remaining
1648  CGF.Builder.CreateBr(BaseDtorEndBB);
1649  CGF.EmitBlock(BaseDtorEndBB);
1650  }
1651 }
1652 
1653 void MicrosoftCXXABI::emitVTableTypeMetadata(const VPtrInfo &Info,
1654  const CXXRecordDecl *RD,
1655  llvm::GlobalVariable *VTable) {
1656  if (!CGM.getCodeGenOpts().LTOUnit)
1657  return;
1658 
1659  // TODO: Should VirtualFunctionElimination also be supported here?
1660  // See similar handling in CodeGenModule::EmitVTableTypeMetadata.
1661  if (CGM.getCodeGenOpts().WholeProgramVTables) {
1663  llvm::GlobalObject::VCallVisibility TypeVis =
1664  CGM.GetVCallVisibilityLevel(RD, Visited);
1665  if (TypeVis != llvm::GlobalObject::VCallVisibilityPublic)
1666  VTable->setVCallVisibilityMetadata(TypeVis);
1667  }
1668 
1669  // The location of the first virtual function pointer in the virtual table,
1670  // aka the "address point" on Itanium. This is at offset 0 if RTTI is
1671  // disabled, or sizeof(void*) if RTTI is enabled.
1672  CharUnits AddressPoint =
1673  getContext().getLangOpts().RTTIData
1674  ? getContext().toCharUnitsFromBits(
1675  getContext().getTargetInfo().getPointerWidth(0))
1676  : CharUnits::Zero();
1677 
1678  if (Info.PathToIntroducingObject.empty()) {
1679  CGM.AddVTableTypeMetadata(VTable, AddressPoint, RD);
1680  return;
1681  }
1682 
1683  // Add a bitset entry for the least derived base belonging to this vftable.
1684  CGM.AddVTableTypeMetadata(VTable, AddressPoint,
1685  Info.PathToIntroducingObject.back());
1686 
1687  // Add a bitset entry for each derived class that is laid out at the same
1688  // offset as the least derived base.
1689  for (unsigned I = Info.PathToIntroducingObject.size() - 1; I != 0; --I) {
1690  const CXXRecordDecl *DerivedRD = Info.PathToIntroducingObject[I - 1];
1691  const CXXRecordDecl *BaseRD = Info.PathToIntroducingObject[I];
1692 
1693  const ASTRecordLayout &Layout =
1694  getContext().getASTRecordLayout(DerivedRD);
1695  CharUnits Offset;
1696  auto VBI = Layout.getVBaseOffsetsMap().find(BaseRD);
1697  if (VBI == Layout.getVBaseOffsetsMap().end())
1698  Offset = Layout.getBaseClassOffset(BaseRD);
1699  else
1700  Offset = VBI->second.VBaseOffset;
1701  if (!Offset.isZero())
1702  return;
1703  CGM.AddVTableTypeMetadata(VTable, AddressPoint, DerivedRD);
1704  }
1705 
1706  // Finally do the same for the most derived class.
1707  if (Info.FullOffsetInMDC.isZero())
1708  CGM.AddVTableTypeMetadata(VTable, AddressPoint, RD);
1709 }
1710 
1711 void MicrosoftCXXABI::emitVTableDefinitions(CodeGenVTables &CGVT,
1712  const CXXRecordDecl *RD) {
1713  MicrosoftVTableContext &VFTContext = CGM.getMicrosoftVTableContext();
1714  const VPtrInfoVector &VFPtrs = VFTContext.getVFPtrOffsets(RD);
1715 
1716  for (const std::unique_ptr<VPtrInfo>& Info : VFPtrs) {
1717  llvm::GlobalVariable *VTable = getAddrOfVTable(RD, Info->FullOffsetInMDC);
1718  if (VTable->hasInitializer())
1719  continue;
1720 
1721  const VTableLayout &VTLayout =
1722  VFTContext.getVFTableLayout(RD, Info->FullOffsetInMDC);
1723 
1724  llvm::Constant *RTTI = nullptr;
1725  if (any_of(VTLayout.vtable_components(),
1726  [](const VTableComponent &VTC) { return VTC.isRTTIKind(); }))
1727  RTTI = getMSCompleteObjectLocator(RD, *Info);
1728 
1729  ConstantInitBuilder builder(CGM);
1730  auto components = builder.beginStruct();
1731  CGVT.createVTableInitializer(components, VTLayout, RTTI,
1732  VTable->hasLocalLinkage());
1733  components.finishAndSetAsInitializer(VTable);
1734 
1735  emitVTableTypeMetadata(*Info, RD, VTable);
1736  }
1737 }
1738 
1739 bool MicrosoftCXXABI::isVirtualOffsetNeededForVTableField(
1741  return Vptr.NearestVBase != nullptr;
1742 }
1743 
1744 llvm::Value *MicrosoftCXXABI::getVTableAddressPointInStructor(
1745  CodeGenFunction &CGF, const CXXRecordDecl *VTableClass, BaseSubobject Base,
1746  const CXXRecordDecl *NearestVBase) {
1747  llvm::Constant *VTableAddressPoint = getVTableAddressPoint(Base, VTableClass);
1748  if (!VTableAddressPoint) {
1749  assert(Base.getBase()->getNumVBases() &&
1750  !getContext().getASTRecordLayout(Base.getBase()).hasOwnVFPtr());
1751  }
1752  return VTableAddressPoint;
1753 }
1754 
1756  const CXXRecordDecl *RD, const VPtrInfo &VFPtr,
1757  SmallString<256> &Name) {
1758  llvm::raw_svector_ostream Out(Name);
1759  MangleContext.mangleCXXVFTable(RD, VFPtr.MangledPath, Out);
1760 }
1761 
1762 llvm::Constant *
1763 MicrosoftCXXABI::getVTableAddressPoint(BaseSubobject Base,
1764  const CXXRecordDecl *VTableClass) {
1765  (void)getAddrOfVTable(VTableClass, Base.getBaseOffset());
1766  VFTableIdTy ID(VTableClass, Base.getBaseOffset());
1767  return VFTablesMap[ID];
1768 }
1769 
1770 llvm::Constant *MicrosoftCXXABI::getVTableAddressPointForConstExpr(
1771  BaseSubobject Base, const CXXRecordDecl *VTableClass) {
1772  llvm::Constant *VFTable = getVTableAddressPoint(Base, VTableClass);
1773  assert(VFTable && "Couldn't find a vftable for the given base?");
1774  return VFTable;
1775 }
1776 
1777 llvm::GlobalVariable *MicrosoftCXXABI::getAddrOfVTable(const CXXRecordDecl *RD,
1778  CharUnits VPtrOffset) {
1779  // getAddrOfVTable may return 0 if asked to get an address of a vtable which
1780  // shouldn't be used in the given record type. We want to cache this result in
1781  // VFTablesMap, thus a simple zero check is not sufficient.
1782 
1783  VFTableIdTy ID(RD, VPtrOffset);
1784  VTablesMapTy::iterator I;
1785  bool Inserted;
1786  std::tie(I, Inserted) = VTablesMap.insert(std::make_pair(ID, nullptr));
1787  if (!Inserted)
1788  return I->second;
1789 
1790  llvm::GlobalVariable *&VTable = I->second;
1791 
1792  MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
1793  const VPtrInfoVector &VFPtrs = VTContext.getVFPtrOffsets(RD);
1794 
1795  if (DeferredVFTables.insert(RD).second) {
1796  // We haven't processed this record type before.
1797  // Queue up this vtable for possible deferred emission.
1798  CGM.addDeferredVTable(RD);
1799 
1800 #ifndef NDEBUG
1801  // Create all the vftables at once in order to make sure each vftable has
1802  // a unique mangled name.
1803  llvm::StringSet<> ObservedMangledNames;
1804  for (size_t J = 0, F = VFPtrs.size(); J != F; ++J) {
1805  SmallString<256> Name;
1806  mangleVFTableName(getMangleContext(), RD, *VFPtrs[J], Name);
1807  if (!ObservedMangledNames.insert(Name.str()).second)
1808  llvm_unreachable("Already saw this mangling before?");
1809  }
1810 #endif
1811  }
1812 
1813  const std::unique_ptr<VPtrInfo> *VFPtrI =
1814  llvm::find_if(VFPtrs, [&](const std::unique_ptr<VPtrInfo> &VPI) {
1815  return VPI->FullOffsetInMDC == VPtrOffset;
1816  });
1817  if (VFPtrI == VFPtrs.end()) {
1818  VFTablesMap[ID] = nullptr;
1819  return nullptr;
1820  }
1821  const std::unique_ptr<VPtrInfo> &VFPtr = *VFPtrI;
1822 
1823  SmallString<256> VFTableName;
1824  mangleVFTableName(getMangleContext(), RD, *VFPtr, VFTableName);
1825 
1826  // Classes marked __declspec(dllimport) need vftables generated on the
1827  // import-side in order to support features like constexpr. No other
1828  // translation unit relies on the emission of the local vftable, translation
1829  // units are expected to generate them as needed.
1830  //
1831  // Because of this unique behavior, we maintain this logic here instead of
1832  // getVTableLinkage.
1833  llvm::GlobalValue::LinkageTypes VFTableLinkage =
1834  RD->hasAttr<DLLImportAttr>() ? llvm::GlobalValue::LinkOnceODRLinkage
1835  : CGM.getVTableLinkage(RD);
1836  bool VFTableComesFromAnotherTU =
1837  llvm::GlobalValue::isAvailableExternallyLinkage(VFTableLinkage) ||
1838  llvm::GlobalValue::isExternalLinkage(VFTableLinkage);
1839  bool VTableAliasIsRequred =
1840  !VFTableComesFromAnotherTU && getContext().getLangOpts().RTTIData;
1841 
1842  if (llvm::GlobalValue *VFTable =
1843  CGM.getModule().getNamedGlobal(VFTableName)) {
1844  VFTablesMap[ID] = VFTable;
1845  VTable = VTableAliasIsRequred
1846  ? cast<llvm::GlobalVariable>(
1847  cast<llvm::GlobalAlias>(VFTable)->getAliaseeObject())
1848  : cast<llvm::GlobalVariable>(VFTable);
1849  return VTable;
1850  }
1851 
1852  const VTableLayout &VTLayout =
1853  VTContext.getVFTableLayout(RD, VFPtr->FullOffsetInMDC);
1854  llvm::GlobalValue::LinkageTypes VTableLinkage =
1855  VTableAliasIsRequred ? llvm::GlobalValue::PrivateLinkage : VFTableLinkage;
1856 
1857  StringRef VTableName = VTableAliasIsRequred ? StringRef() : VFTableName.str();
1858 
1859  llvm::Type *VTableType = CGM.getVTables().getVTableType(VTLayout);
1860 
1861  // Create a backing variable for the contents of VTable. The VTable may
1862  // or may not include space for a pointer to RTTI data.
1863  llvm::GlobalValue *VFTable;
1864  VTable = new llvm::GlobalVariable(CGM.getModule(), VTableType,
1865  /*isConstant=*/true, VTableLinkage,
1866  /*Initializer=*/nullptr, VTableName);
1867  VTable->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1868 
1869  llvm::Comdat *C = nullptr;
1870  if (!VFTableComesFromAnotherTU &&
1871  (llvm::GlobalValue::isWeakForLinker(VFTableLinkage) ||
1872  (llvm::GlobalValue::isLocalLinkage(VFTableLinkage) &&
1873  VTableAliasIsRequred)))
1874  C = CGM.getModule().getOrInsertComdat(VFTableName.str());
1875 
1876  // Only insert a pointer into the VFTable for RTTI data if we are not
1877  // importing it. We never reference the RTTI data directly so there is no
1878  // need to make room for it.
1879  if (VTableAliasIsRequred) {
1880  llvm::Value *GEPIndices[] = {llvm::ConstantInt::get(CGM.Int32Ty, 0),
1881  llvm::ConstantInt::get(CGM.Int32Ty, 0),
1882  llvm::ConstantInt::get(CGM.Int32Ty, 1)};
1883  // Create a GEP which points just after the first entry in the VFTable,
1884  // this should be the location of the first virtual method.
1885  llvm::Constant *VTableGEP = llvm::ConstantExpr::getInBoundsGetElementPtr(
1886  VTable->getValueType(), VTable, GEPIndices);
1887  if (llvm::GlobalValue::isWeakForLinker(VFTableLinkage)) {
1888  VFTableLinkage = llvm::GlobalValue::ExternalLinkage;
1889  if (C)
1890  C->setSelectionKind(llvm::Comdat::Largest);
1891  }
1892  VFTable = llvm::GlobalAlias::create(CGM.Int8PtrTy,
1893  /*AddressSpace=*/0, VFTableLinkage,
1894  VFTableName.str(), VTableGEP,
1895  &CGM.getModule());
1896  VFTable->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1897  } else {
1898  // We don't need a GlobalAlias to be a symbol for the VTable if we won't
1899  // be referencing any RTTI data.
1900  // The GlobalVariable will end up being an appropriate definition of the
1901  // VFTable.
1902  VFTable = VTable;
1903  }
1904  if (C)
1905  VTable->setComdat(C);
1906 
1907  if (RD->hasAttr<DLLExportAttr>())
1908  VFTable->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1909 
1910  VFTablesMap[ID] = VFTable;
1911  return VTable;
1912 }
1913 
1914 CGCallee MicrosoftCXXABI::getVirtualFunctionPointer(CodeGenFunction &CGF,
1915  GlobalDecl GD,
1916  Address This,
1917  llvm::Type *Ty,
1918  SourceLocation Loc) {
1919  CGBuilderTy &Builder = CGF.Builder;
1920 
1921  Ty = Ty->getPointerTo();
1922  Address VPtr =
1923  adjustThisArgumentForVirtualFunctionCall(CGF, GD, This, true);
1924 
1925  auto *MethodDecl = cast<CXXMethodDecl>(GD.getDecl());
1926  llvm::Value *VTable = CGF.GetVTablePtr(VPtr, Ty->getPointerTo(),
1927  MethodDecl->getParent());
1928 
1929  MicrosoftVTableContext &VFTContext = CGM.getMicrosoftVTableContext();
1930  MethodVFTableLocation ML = VFTContext.getMethodVFTableLocation(GD);
1931 
1932  // Compute the identity of the most derived class whose virtual table is
1933  // located at the MethodVFTableLocation ML.
1934  auto getObjectWithVPtr = [&] {
1935  return llvm::find_if(VFTContext.getVFPtrOffsets(
1936  ML.VBase ? ML.VBase : MethodDecl->getParent()),
1937  [&](const std::unique_ptr<VPtrInfo> &Info) {
1938  return Info->FullOffsetInMDC == ML.VFPtrOffset;
1939  })
1940  ->get()
1941  ->ObjectWithVPtr;
1942  };
1943 
1944  llvm::Value *VFunc;
1945  if (CGF.ShouldEmitVTableTypeCheckedLoad(MethodDecl->getParent())) {
1946  VFunc = CGF.EmitVTableTypeCheckedLoad(
1947  getObjectWithVPtr(), VTable,
1948  ML.Index * CGM.getContext().getTargetInfo().getPointerWidth(0) / 8);
1949  } else {
1950  if (CGM.getCodeGenOpts().PrepareForLTO)
1951  CGF.EmitTypeMetadataCodeForVCall(getObjectWithVPtr(), VTable, Loc);
1952 
1953  llvm::Value *VFuncPtr =
1954  Builder.CreateConstInBoundsGEP1_64(Ty, VTable, ML.Index, "vfn");
1955  VFunc = Builder.CreateAlignedLoad(Ty, VFuncPtr, CGF.getPointerAlign());
1956  }
1957 
1958  CGCallee Callee(GD, VFunc);
1959  return Callee;
1960 }
1961 
1962 llvm::Value *MicrosoftCXXABI::EmitVirtualDestructorCall(
1963  CodeGenFunction &CGF, const CXXDestructorDecl *Dtor, CXXDtorType DtorType,
1964  Address This, DeleteOrMemberCallExpr E) {
1965  auto *CE = E.dyn_cast<const CXXMemberCallExpr *>();
1966  auto *D = E.dyn_cast<const CXXDeleteExpr *>();
1967  assert((CE != nullptr) ^ (D != nullptr));
1968  assert(CE == nullptr || CE->arg_begin() == CE->arg_end());
1969  assert(DtorType == Dtor_Deleting || DtorType == Dtor_Complete);
1970 
1971  // We have only one destructor in the vftable but can get both behaviors
1972  // by passing an implicit int parameter.
1973  GlobalDecl GD(Dtor, Dtor_Deleting);
1974  const CGFunctionInfo *FInfo =
1975  &CGM.getTypes().arrangeCXXStructorDeclaration(GD);
1976  llvm::FunctionType *Ty = CGF.CGM.getTypes().GetFunctionType(*FInfo);
1977  CGCallee Callee = CGCallee::forVirtual(CE, GD, This, Ty);
1978 
1979  ASTContext &Context = getContext();
1980  llvm::Value *ImplicitParam = llvm::ConstantInt::get(
1981  llvm::IntegerType::getInt32Ty(CGF.getLLVMContext()),
1982  DtorType == Dtor_Deleting);
1983 
1984  QualType ThisTy;
1985  if (CE) {
1986  ThisTy = CE->getObjectType();
1987  } else {
1988  ThisTy = D->getDestroyedType();
1989  }
1990 
1991  This = adjustThisArgumentForVirtualFunctionCall(CGF, GD, This, true);
1992  RValue RV = CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(), ThisTy,
1993  ImplicitParam, Context.IntTy, CE);
1994  return RV.getScalarVal();
1995 }
1996 
1997 const VBTableGlobals &
1998 MicrosoftCXXABI::enumerateVBTables(const CXXRecordDecl *RD) {
1999  // At this layer, we can key the cache off of a single class, which is much
2000  // easier than caching each vbtable individually.
2001  llvm::DenseMap<const CXXRecordDecl*, VBTableGlobals>::iterator Entry;
2002  bool Added;
2003  std::tie(Entry, Added) =
2004  VBTablesMap.insert(std::make_pair(RD, VBTableGlobals()));
2005  VBTableGlobals &VBGlobals = Entry->second;
2006  if (!Added)
2007  return VBGlobals;
2008 
2009  MicrosoftVTableContext &Context = CGM.getMicrosoftVTableContext();
2010  VBGlobals.VBTables = &Context.enumerateVBTables(RD);
2011 
2012  // Cache the globals for all vbtables so we don't have to recompute the
2013  // mangled names.
2014  llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
2015  for (VPtrInfoVector::const_iterator I = VBGlobals.VBTables->begin(),
2016  E = VBGlobals.VBTables->end();
2017  I != E; ++I) {
2018  VBGlobals.Globals.push_back(getAddrOfVBTable(**I, RD, Linkage));
2019  }
2020 
2021  return VBGlobals;
2022 }
2023 
2024 llvm::Function *
2025 MicrosoftCXXABI::EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
2026  const MethodVFTableLocation &ML) {
2027  assert(!isa<CXXConstructorDecl>(MD) && !isa<CXXDestructorDecl>(MD) &&
2028  "can't form pointers to ctors or virtual dtors");
2029 
2030  // Calculate the mangled name.
2031  SmallString<256> ThunkName;
2032  llvm::raw_svector_ostream Out(ThunkName);
2033  getMangleContext().mangleVirtualMemPtrThunk(MD, ML, Out);
2034 
2035  // If the thunk has been generated previously, just return it.
2036  if (llvm::GlobalValue *GV = CGM.getModule().getNamedValue(ThunkName))
2037  return cast<llvm::Function>(GV);
2038 
2039  // Create the llvm::Function.
2040  const CGFunctionInfo &FnInfo =
2041  CGM.getTypes().arrangeUnprototypedMustTailThunk(MD);
2042  llvm::FunctionType *ThunkTy = CGM.getTypes().GetFunctionType(FnInfo);
2043  llvm::Function *ThunkFn =
2044  llvm::Function::Create(ThunkTy, llvm::Function::ExternalLinkage,
2045  ThunkName.str(), &CGM.getModule());
2046  assert(ThunkFn->getName() == ThunkName && "name was uniqued!");
2047 
2048  ThunkFn->setLinkage(MD->isExternallyVisible()
2049  ? llvm::GlobalValue::LinkOnceODRLinkage
2051  if (MD->isExternallyVisible())
2052  ThunkFn->setComdat(CGM.getModule().getOrInsertComdat(ThunkFn->getName()));
2053 
2054  CGM.SetLLVMFunctionAttributes(MD, FnInfo, ThunkFn, /*IsThunk=*/false);
2055  CGM.SetLLVMFunctionAttributesForDefinition(MD, ThunkFn);
2056 
2057  // Add the "thunk" attribute so that LLVM knows that the return type is
2058  // meaningless. These thunks can be used to call functions with differing
2059  // return types, and the caller is required to cast the prototype
2060  // appropriately to extract the correct value.
2061  ThunkFn->addFnAttr("thunk");
2062 
2063  // These thunks can be compared, so they are not unnamed.
2064  ThunkFn->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::None);
2065 
2066  // Start codegen.
2067  CodeGenFunction CGF(CGM);
2068  CGF.CurGD = GlobalDecl(MD);
2069  CGF.CurFuncIsThunk = true;
2070 
2071  // Build FunctionArgs, but only include the implicit 'this' parameter
2072  // declaration.
2073  FunctionArgList FunctionArgs;
2074  buildThisParam(CGF, FunctionArgs);
2075 
2076  // Start defining the function.
2077  CGF.StartFunction(GlobalDecl(), FnInfo.getReturnType(), ThunkFn, FnInfo,
2078  FunctionArgs, MD->getLocation(), SourceLocation());
2079  setCXXABIThisValue(CGF, loadIncomingCXXThis(CGF));
2080 
2081  // Load the vfptr and then callee from the vftable. The callee should have
2082  // adjusted 'this' so that the vfptr is at offset zero.
2083  llvm::Type *ThunkPtrTy = ThunkTy->getPointerTo();
2084  llvm::Value *VTable = CGF.GetVTablePtr(
2085  getThisAddress(CGF), ThunkPtrTy->getPointerTo(), MD->getParent());
2086 
2087  llvm::Value *VFuncPtr = CGF.Builder.CreateConstInBoundsGEP1_64(
2088  ThunkPtrTy, VTable, ML.Index, "vfn");
2089  llvm::Value *Callee =
2090  CGF.Builder.CreateAlignedLoad(ThunkPtrTy, VFuncPtr, CGF.getPointerAlign());
2091 
2092  CGF.EmitMustTailThunk(MD, getThisValue(CGF), {ThunkTy, Callee});
2093 
2094  return ThunkFn;
2095 }
2096 
2097 void MicrosoftCXXABI::emitVirtualInheritanceTables(const CXXRecordDecl *RD) {
2098  const VBTableGlobals &VBGlobals = enumerateVBTables(RD);
2099  for (unsigned I = 0, E = VBGlobals.VBTables->size(); I != E; ++I) {
2100  const std::unique_ptr<VPtrInfo>& VBT = (*VBGlobals.VBTables)[I];
2101  llvm::GlobalVariable *GV = VBGlobals.Globals[I];
2102  if (GV->isDeclaration())
2103  emitVBTableDefinition(*VBT, RD, GV);
2104  }
2105 }
2106 
2107 llvm::GlobalVariable *
2108 MicrosoftCXXABI::getAddrOfVBTable(const VPtrInfo &VBT, const CXXRecordDecl *RD,
2109  llvm::GlobalVariable::LinkageTypes Linkage) {
2110  SmallString<256> OutName;
2111  llvm::raw_svector_ostream Out(OutName);
2112  getMangleContext().mangleCXXVBTable(RD, VBT.MangledPath, Out);
2113  StringRef Name = OutName.str();
2114 
2115  llvm::ArrayType *VBTableType =
2116  llvm::ArrayType::get(CGM.IntTy, 1 + VBT.ObjectWithVPtr->getNumVBases());
2117 
2118  assert(!CGM.getModule().getNamedGlobal(Name) &&
2119  "vbtable with this name already exists: mangling bug?");
2120  CharUnits Alignment =
2121  CGM.getContext().getTypeAlignInChars(CGM.getContext().IntTy);
2122  llvm::GlobalVariable *GV = CGM.CreateOrReplaceCXXRuntimeVariable(
2123  Name, VBTableType, Linkage, Alignment.getQuantity());
2124  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2125 
2126  if (RD->hasAttr<DLLImportAttr>())
2127  GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
2128  else if (RD->hasAttr<DLLExportAttr>())
2129  GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
2130 
2131  if (!GV->hasExternalLinkage())
2132  emitVBTableDefinition(VBT, RD, GV);
2133 
2134  return GV;
2135 }
2136 
2137 void MicrosoftCXXABI::emitVBTableDefinition(const VPtrInfo &VBT,
2138  const CXXRecordDecl *RD,
2139  llvm::GlobalVariable *GV) const {
2140  const CXXRecordDecl *ObjectWithVPtr = VBT.ObjectWithVPtr;
2141 
2142  assert(RD->getNumVBases() && ObjectWithVPtr->getNumVBases() &&
2143  "should only emit vbtables for classes with vbtables");
2144 
2145  const ASTRecordLayout &BaseLayout =
2146  getContext().getASTRecordLayout(VBT.IntroducingObject);
2147  const ASTRecordLayout &DerivedLayout = getContext().getASTRecordLayout(RD);
2148 
2149  SmallVector<llvm::Constant *, 4> Offsets(1 + ObjectWithVPtr->getNumVBases(),
2150  nullptr);
2151 
2152  // The offset from ObjectWithVPtr's vbptr to itself always leads.
2153  CharUnits VBPtrOffset = BaseLayout.getVBPtrOffset();
2154  Offsets[0] = llvm::ConstantInt::get(CGM.IntTy, -VBPtrOffset.getQuantity());
2155 
2156  MicrosoftVTableContext &Context = CGM.getMicrosoftVTableContext();
2157  for (const auto &I : ObjectWithVPtr->vbases()) {
2158  const CXXRecordDecl *VBase = I.getType()->getAsCXXRecordDecl();
2159  CharUnits Offset = DerivedLayout.getVBaseClassOffset(VBase);
2160  assert(!Offset.isNegative());
2161 
2162  // Make it relative to the subobject vbptr.
2163  CharUnits CompleteVBPtrOffset = VBT.NonVirtualOffset + VBPtrOffset;
2164  if (VBT.getVBaseWithVPtr())
2165  CompleteVBPtrOffset +=
2166  DerivedLayout.getVBaseClassOffset(VBT.getVBaseWithVPtr());
2167  Offset -= CompleteVBPtrOffset;
2168 
2169  unsigned VBIndex = Context.getVBTableIndex(ObjectWithVPtr, VBase);
2170  assert(Offsets[VBIndex] == nullptr && "The same vbindex seen twice?");
2171  Offsets[VBIndex] = llvm::ConstantInt::get(CGM.IntTy, Offset.getQuantity());
2172  }
2173 
2174  assert(Offsets.size() ==
2175  cast<llvm::ArrayType>(GV->getValueType())->getNumElements());
2176  llvm::ArrayType *VBTableType =
2177  llvm::ArrayType::get(CGM.IntTy, Offsets.size());
2178  llvm::Constant *Init = llvm::ConstantArray::get(VBTableType, Offsets);
2179  GV->setInitializer(Init);
2180 
2181  if (RD->hasAttr<DLLImportAttr>())
2182  GV->setLinkage(llvm::GlobalVariable::AvailableExternallyLinkage);
2183 }
2184 
2185 llvm::Value *MicrosoftCXXABI::performThisAdjustment(CodeGenFunction &CGF,
2186  Address This,
2187  const ThisAdjustment &TA) {
2188  if (TA.isEmpty())
2189  return This.getPointer();
2190 
2192 
2193  llvm::Value *V;
2194  if (TA.Virtual.isEmpty()) {
2195  V = This.getPointer();
2196  } else {
2197  assert(TA.Virtual.Microsoft.VtordispOffset < 0);
2198  // Adjust the this argument based on the vtordisp value.
2199  Address VtorDispPtr =
2202  VtorDispPtr = CGF.Builder.CreateElementBitCast(VtorDispPtr, CGF.Int32Ty);
2203  llvm::Value *VtorDisp = CGF.Builder.CreateLoad(VtorDispPtr, "vtordisp");
2204  V = CGF.Builder.CreateGEP(This.getElementType(), This.getPointer(),
2205  CGF.Builder.CreateNeg(VtorDisp));
2206 
2207  // Unfortunately, having applied the vtordisp means that we no
2208  // longer really have a known alignment for the vbptr step.
2209  // We'll assume the vbptr is pointer-aligned.
2210 
2211  if (TA.Virtual.Microsoft.VBPtrOffset) {
2212  // If the final overrider is defined in a virtual base other than the one
2213  // that holds the vfptr, we have to use a vtordispex thunk which looks up
2214  // the vbtable of the derived class.
2215  assert(TA.Virtual.Microsoft.VBPtrOffset > 0);
2216  assert(TA.Virtual.Microsoft.VBOffsetOffset >= 0);
2217  llvm::Value *VBPtr;
2218  llvm::Value *VBaseOffset =
2219  GetVBaseOffsetFromVBPtr(CGF, Address(V, CGF.getPointerAlign()),
2221  TA.Virtual.Microsoft.VBOffsetOffset, &VBPtr);
2222  V = CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, VBPtr, VBaseOffset);
2223  }
2224  }
2225 
2226  if (TA.NonVirtual) {
2227  // Non-virtual adjustment might result in a pointer outside the allocated
2228  // object, e.g. if the final overrider class is laid out after the virtual
2229  // base that declares a method in the most derived class.
2230  V = CGF.Builder.CreateConstGEP1_32(CGF.Int8Ty, V, TA.NonVirtual);
2231  }
2232 
2233  // Don't need to bitcast back, the call CodeGen will handle this.
2234  return V;
2235 }
2236 
2237 llvm::Value *
2238 MicrosoftCXXABI::performReturnAdjustment(CodeGenFunction &CGF, Address Ret,
2239  const ReturnAdjustment &RA) {
2240  if (RA.isEmpty())
2241  return Ret.getPointer();
2242 
2243  auto OrigTy = Ret.getType();
2245 
2246  llvm::Value *V = Ret.getPointer();
2247  if (RA.Virtual.Microsoft.VBIndex) {
2248  assert(RA.Virtual.Microsoft.VBIndex > 0);
2249  int32_t IntSize = CGF.getIntSize().getQuantity();
2250  llvm::Value *VBPtr;
2251  llvm::Value *VBaseOffset =
2252  GetVBaseOffsetFromVBPtr(CGF, Ret, RA.Virtual.Microsoft.VBPtrOffset,
2253  IntSize * RA.Virtual.Microsoft.VBIndex, &VBPtr);
2254  V = CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, VBPtr, VBaseOffset);
2255  }
2256 
2257  if (RA.NonVirtual)
2258  V = CGF.Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, V, RA.NonVirtual);
2259 
2260  // Cast back to the original type.
2261  return CGF.Builder.CreateBitCast(V, OrigTy);
2262 }
2263 
2264 bool MicrosoftCXXABI::requiresArrayCookie(const CXXDeleteExpr *expr,
2265  QualType elementType) {
2266  // Microsoft seems to completely ignore the possibility of a
2267  // two-argument usual deallocation function.
2268  return elementType.isDestructedType();
2269 }
2270 
2271 bool MicrosoftCXXABI::requiresArrayCookie(const CXXNewExpr *expr) {
2272  // Microsoft seems to completely ignore the possibility of a
2273  // two-argument usual deallocation function.
2274  return expr->getAllocatedType().isDestructedType();
2275 }
2276 
2277 CharUnits MicrosoftCXXABI::getArrayCookieSizeImpl(QualType type) {
2278  // The array cookie is always a size_t; we then pad that out to the
2279  // alignment of the element type.
2280  ASTContext &Ctx = getContext();
2281  return std::max(Ctx.getTypeSizeInChars(Ctx.getSizeType()),
2282  Ctx.getTypeAlignInChars(type));
2283 }
2284 
2285 llvm::Value *MicrosoftCXXABI::readArrayCookieImpl(CodeGenFunction &CGF,
2286  Address allocPtr,
2287  CharUnits cookieSize) {
2288  Address numElementsPtr =
2289  CGF.Builder.CreateElementBitCast(allocPtr, CGF.SizeTy);
2290  return CGF.Builder.CreateLoad(numElementsPtr);
2291 }
2292 
2293 Address MicrosoftCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
2294  Address newPtr,
2295  llvm::Value *numElements,
2296  const CXXNewExpr *expr,
2297  QualType elementType) {
2298  assert(requiresArrayCookie(expr));
2299 
2300  // The size of the cookie.
2301  CharUnits cookieSize = getArrayCookieSizeImpl(elementType);
2302 
2303  // Compute an offset to the cookie.
2304  Address cookiePtr = newPtr;
2305 
2306  // Write the number of elements into the appropriate slot.
2307  Address numElementsPtr
2308  = CGF.Builder.CreateElementBitCast(cookiePtr, CGF.SizeTy);
2309  CGF.Builder.CreateStore(numElements, numElementsPtr);
2310 
2311  // Finally, compute a pointer to the actual data buffer by skipping
2312  // over the cookie completely.
2313  return CGF.Builder.CreateConstInBoundsByteGEP(newPtr, cookieSize);
2314 }
2315 
2317  llvm::FunctionCallee Dtor,
2318  llvm::Constant *Addr) {
2319  // Create a function which calls the destructor.
2320  llvm::Constant *DtorStub = CGF.createAtExitStub(VD, Dtor, Addr);
2321 
2322  // extern "C" int __tlregdtor(void (*f)(void));
2323  llvm::FunctionType *TLRegDtorTy = llvm::FunctionType::get(
2324  CGF.IntTy, DtorStub->getType(), /*isVarArg=*/false);
2325 
2326  llvm::FunctionCallee TLRegDtor = CGF.CGM.CreateRuntimeFunction(
2327  TLRegDtorTy, "__tlregdtor", llvm::AttributeList(), /*Local=*/true);
2328  if (llvm::Function *TLRegDtorFn =
2329  dyn_cast<llvm::Function>(TLRegDtor.getCallee()))
2330  TLRegDtorFn->setDoesNotThrow();
2331 
2332  CGF.EmitNounwindRuntimeCall(TLRegDtor, DtorStub);
2333 }
2334 
2335 void MicrosoftCXXABI::registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
2336  llvm::FunctionCallee Dtor,
2337  llvm::Constant *Addr) {
2338  if (D.isNoDestroy(CGM.getContext()))
2339  return;
2340 
2341  if (D.getTLSKind())
2342  return emitGlobalDtorWithTLRegDtor(CGF, D, Dtor, Addr);
2343 
2344  // The default behavior is to use atexit.
2345  CGF.registerGlobalDtorWithAtExit(D, Dtor, Addr);
2346 }
2347 
2348 void MicrosoftCXXABI::EmitThreadLocalInitFuncs(
2349  CodeGenModule &CGM, ArrayRef<const VarDecl *> CXXThreadLocals,
2350  ArrayRef<llvm::Function *> CXXThreadLocalInits,
2351  ArrayRef<const VarDecl *> CXXThreadLocalInitVars) {
2352  if (CXXThreadLocalInits.empty())
2353  return;
2354 
2355  CGM.AppendLinkerOptions(CGM.getTarget().getTriple().getArch() ==
2356  llvm::Triple::x86
2357  ? "/include:___dyn_tls_init@12"
2358  : "/include:__dyn_tls_init");
2359 
2360  // This will create a GV in the .CRT$XDU section. It will point to our
2361  // initialization function. The CRT will call all of these function
2362  // pointers at start-up time and, eventually, at thread-creation time.
2363  auto AddToXDU = [&CGM](llvm::Function *InitFunc) {
2364  llvm::GlobalVariable *InitFuncPtr = new llvm::GlobalVariable(
2365  CGM.getModule(), InitFunc->getType(), /*isConstant=*/true,
2367  Twine(InitFunc->getName(), "$initializer$"));
2368  InitFuncPtr->setSection(".CRT$XDU");
2369  // This variable has discardable linkage, we have to add it to @llvm.used to
2370  // ensure it won't get discarded.
2371  CGM.addUsedGlobal(InitFuncPtr);
2372  return InitFuncPtr;
2373  };
2374 
2375  std::vector<llvm::Function *> NonComdatInits;
2376  for (size_t I = 0, E = CXXThreadLocalInitVars.size(); I != E; ++I) {
2377  llvm::GlobalVariable *GV = cast<llvm::GlobalVariable>(
2378  CGM.GetGlobalValue(CGM.getMangledName(CXXThreadLocalInitVars[I])));
2379  llvm::Function *F = CXXThreadLocalInits[I];
2380 
2381  // If the GV is already in a comdat group, then we have to join it.
2382  if (llvm::Comdat *C = GV->getComdat())
2383  AddToXDU(F)->setComdat(C);
2384  else
2385  NonComdatInits.push_back(F);
2386  }
2387 
2388  if (!NonComdatInits.empty()) {
2389  llvm::FunctionType *FTy =
2390  llvm::FunctionType::get(CGM.VoidTy, /*isVarArg=*/false);
2391  llvm::Function *InitFunc = CGM.CreateGlobalInitOrCleanUpFunction(
2392  FTy, "__tls_init", CGM.getTypes().arrangeNullaryFunction(),
2393  SourceLocation(), /*TLS=*/true);
2394  CodeGenFunction(CGM).GenerateCXXGlobalInitFunc(InitFunc, NonComdatInits);
2395 
2396  AddToXDU(InitFunc);
2397  }
2398 }
2399 
2400 LValue MicrosoftCXXABI::EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF,
2401  const VarDecl *VD,
2402  QualType LValType) {
2403  CGF.CGM.ErrorUnsupported(VD, "thread wrappers");
2404  return LValue();
2405 }
2406 
2408  StringRef VarName("_Init_thread_epoch");
2409  CharUnits Align = CGM.getIntAlign();
2410  if (auto *GV = CGM.getModule().getNamedGlobal(VarName))
2411  return ConstantAddress(GV, Align);
2412  auto *GV = new llvm::GlobalVariable(
2413  CGM.getModule(), CGM.IntTy,
2414  /*isConstant=*/false, llvm::GlobalVariable::ExternalLinkage,
2415  /*Initializer=*/nullptr, VarName,
2416  /*InsertBefore=*/nullptr, llvm::GlobalVariable::GeneralDynamicTLSModel);
2417  GV->setAlignment(Align.getAsAlign());
2418  return ConstantAddress(GV, Align);
2419 }
2420 
2421 static llvm::FunctionCallee getInitThreadHeaderFn(CodeGenModule &CGM) {
2422  llvm::FunctionType *FTy =
2423  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
2424  CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
2425  return CGM.CreateRuntimeFunction(
2426  FTy, "_Init_thread_header",
2427  llvm::AttributeList::get(CGM.getLLVMContext(),
2428  llvm::AttributeList::FunctionIndex,
2429  llvm::Attribute::NoUnwind),
2430  /*Local=*/true);
2431 }
2432 
2433 static llvm::FunctionCallee getInitThreadFooterFn(CodeGenModule &CGM) {
2434  llvm::FunctionType *FTy =
2435  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
2436  CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
2437  return CGM.CreateRuntimeFunction(
2438  FTy, "_Init_thread_footer",
2439  llvm::AttributeList::get(CGM.getLLVMContext(),
2440  llvm::AttributeList::FunctionIndex,
2441  llvm::Attribute::NoUnwind),
2442  /*Local=*/true);
2443 }
2444 
2445 static llvm::FunctionCallee getInitThreadAbortFn(CodeGenModule &CGM) {
2446  llvm::FunctionType *FTy =
2447  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
2448  CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
2449  return CGM.CreateRuntimeFunction(
2450  FTy, "_Init_thread_abort",
2451  llvm::AttributeList::get(CGM.getLLVMContext(),
2452  llvm::AttributeList::FunctionIndex,
2453  llvm::Attribute::NoUnwind),
2454  /*Local=*/true);
2455 }
2456 
2457 namespace {
2458 struct ResetGuardBit final : EHScopeStack::Cleanup {
2459  Address Guard;
2460  unsigned GuardNum;
2461  ResetGuardBit(Address Guard, unsigned GuardNum)
2462  : Guard(Guard), GuardNum(GuardNum) {}
2463 
2464  void Emit(CodeGenFunction &CGF, Flags flags) override {
2465  // Reset the bit in the mask so that the static variable may be
2466  // reinitialized.
2467  CGBuilderTy &Builder = CGF.Builder;
2468  llvm::LoadInst *LI = Builder.CreateLoad(Guard);
2469  llvm::ConstantInt *Mask =
2470  llvm::ConstantInt::get(CGF.IntTy, ~(1ULL << GuardNum));
2471  Builder.CreateStore(Builder.CreateAnd(LI, Mask), Guard);
2472  }
2473 };
2474 
2475 struct CallInitThreadAbort final : EHScopeStack::Cleanup {
2476  llvm::Value *Guard;
2477  CallInitThreadAbort(Address Guard) : Guard(Guard.getPointer()) {}
2478 
2479  void Emit(CodeGenFunction &CGF, Flags flags) override {
2480  // Calling _Init_thread_abort will reset the guard's state.
2482  }
2483 };
2484 }
2485 
2486 void MicrosoftCXXABI::EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
2487  llvm::GlobalVariable *GV,
2488  bool PerformInit) {
2489  // MSVC only uses guards for static locals.
2490  if (!D.isStaticLocal()) {
2491  assert(GV->hasWeakLinkage() || GV->hasLinkOnceLinkage());
2492  // GlobalOpt is allowed to discard the initializer, so use linkonce_odr.
2493  llvm::Function *F = CGF.CurFn;
2494  F->setLinkage(llvm::GlobalValue::LinkOnceODRLinkage);
2495  F->setComdat(CGM.getModule().getOrInsertComdat(F->getName()));
2496  CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
2497  return;
2498  }
2499 
2500  bool ThreadlocalStatic = D.getTLSKind();
2501  bool ThreadsafeStatic = getContext().getLangOpts().ThreadsafeStatics;
2502 
2503  // Thread-safe static variables which aren't thread-specific have a
2504  // per-variable guard.
2505  bool HasPerVariableGuard = ThreadsafeStatic && !ThreadlocalStatic;
2506 
2507  CGBuilderTy &Builder = CGF.Builder;
2508  llvm::IntegerType *GuardTy = CGF.Int32Ty;
2509  llvm::ConstantInt *Zero = llvm::ConstantInt::get(GuardTy, 0);
2510  CharUnits GuardAlign = CharUnits::fromQuantity(4);
2511 
2512  // Get the guard variable for this function if we have one already.
2513  GuardInfo *GI = nullptr;
2514  if (ThreadlocalStatic)
2515  GI = &ThreadLocalGuardVariableMap[D.getDeclContext()];
2516  else if (!ThreadsafeStatic)
2517  GI = &GuardVariableMap[D.getDeclContext()];
2518 
2519  llvm::GlobalVariable *GuardVar = GI ? GI->Guard : nullptr;
2520  unsigned GuardNum;
2521  if (D.isExternallyVisible()) {
2522  // Externally visible variables have to be numbered in Sema to properly
2523  // handle unreachable VarDecls.
2524  GuardNum = getContext().getStaticLocalNumber(&D);
2525  assert(GuardNum > 0);
2526  GuardNum--;
2527  } else if (HasPerVariableGuard) {
2528  GuardNum = ThreadSafeGuardNumMap[D.getDeclContext()]++;
2529  } else {
2530  // Non-externally visible variables are numbered here in CodeGen.
2531  GuardNum = GI->BitIndex++;
2532  }
2533 
2534  if (!HasPerVariableGuard && GuardNum >= 32) {
2535  if (D.isExternallyVisible())
2536  ErrorUnsupportedABI(CGF, "more than 32 guarded initializations");
2537  GuardNum %= 32;
2538  GuardVar = nullptr;
2539  }
2540 
2541  if (!GuardVar) {
2542  // Mangle the name for the guard.
2543  SmallString<256> GuardName;
2544  {
2545  llvm::raw_svector_ostream Out(GuardName);
2546  if (HasPerVariableGuard)
2547  getMangleContext().mangleThreadSafeStaticGuardVariable(&D, GuardNum,
2548  Out);
2549  else
2550  getMangleContext().mangleStaticGuardVariable(&D, Out);
2551  }
2552 
2553  // Create the guard variable with a zero-initializer. Just absorb linkage,
2554  // visibility and dll storage class from the guarded variable.
2555  GuardVar =
2556  new llvm::GlobalVariable(CGM.getModule(), GuardTy, /*isConstant=*/false,
2557  GV->getLinkage(), Zero, GuardName.str());
2558  GuardVar->setVisibility(GV->getVisibility());
2559  GuardVar->setDLLStorageClass(GV->getDLLStorageClass());
2560  GuardVar->setAlignment(GuardAlign.getAsAlign());
2561  if (GuardVar->isWeakForLinker())
2562  GuardVar->setComdat(
2563  CGM.getModule().getOrInsertComdat(GuardVar->getName()));
2564  if (D.getTLSKind())
2565  CGM.setTLSMode(GuardVar, D);
2566  if (GI && !HasPerVariableGuard)
2567  GI->Guard = GuardVar;
2568  }
2569 
2570  ConstantAddress GuardAddr(GuardVar, GuardAlign);
2571 
2572  assert(GuardVar->getLinkage() == GV->getLinkage() &&
2573  "static local from the same function had different linkage");
2574 
2575  if (!HasPerVariableGuard) {
2576  // Pseudo code for the test:
2577  // if (!(GuardVar & MyGuardBit)) {
2578  // GuardVar |= MyGuardBit;
2579  // ... initialize the object ...;
2580  // }
2581 
2582  // Test our bit from the guard variable.
2583  llvm::ConstantInt *Bit = llvm::ConstantInt::get(GuardTy, 1ULL << GuardNum);
2584  llvm::LoadInst *LI = Builder.CreateLoad(GuardAddr);
2585  llvm::Value *NeedsInit =
2586  Builder.CreateICmpEQ(Builder.CreateAnd(LI, Bit), Zero);
2587  llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
2588  llvm::BasicBlock *EndBlock = CGF.createBasicBlock("init.end");
2589  CGF.EmitCXXGuardedInitBranch(NeedsInit, InitBlock, EndBlock,
2591 
2592  // Set our bit in the guard variable and emit the initializer and add a global
2593  // destructor if appropriate.
2594  CGF.EmitBlock(InitBlock);
2595  Builder.CreateStore(Builder.CreateOr(LI, Bit), GuardAddr);
2596  CGF.EHStack.pushCleanup<ResetGuardBit>(EHCleanup, GuardAddr, GuardNum);
2597  CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
2598  CGF.PopCleanupBlock();
2599  Builder.CreateBr(EndBlock);
2600 
2601  // Continue.
2602  CGF.EmitBlock(EndBlock);
2603  } else {
2604  // Pseudo code for the test:
2605  // if (TSS > _Init_thread_epoch) {
2606  // _Init_thread_header(&TSS);
2607  // if (TSS == -1) {
2608  // ... initialize the object ...;
2609  // _Init_thread_footer(&TSS);
2610  // }
2611  // }
2612  //
2613  // The algorithm is almost identical to what can be found in the appendix
2614  // found in N2325.
2615 
2616  // This BasicBLock determines whether or not we have any work to do.
2617  llvm::LoadInst *FirstGuardLoad = Builder.CreateLoad(GuardAddr);
2618  FirstGuardLoad->setOrdering(llvm::AtomicOrdering::Unordered);
2619  llvm::LoadInst *InitThreadEpoch =
2620  Builder.CreateLoad(getInitThreadEpochPtr(CGM));
2621  llvm::Value *IsUninitialized =
2622  Builder.CreateICmpSGT(FirstGuardLoad, InitThreadEpoch);
2623  llvm::BasicBlock *AttemptInitBlock = CGF.createBasicBlock("init.attempt");
2624  llvm::BasicBlock *EndBlock = CGF.createBasicBlock("init.end");
2625  CGF.EmitCXXGuardedInitBranch(IsUninitialized, AttemptInitBlock, EndBlock,
2627 
2628  // This BasicBlock attempts to determine whether or not this thread is
2629  // responsible for doing the initialization.
2630  CGF.EmitBlock(AttemptInitBlock);
2632  GuardAddr.getPointer());
2633  llvm::LoadInst *SecondGuardLoad = Builder.CreateLoad(GuardAddr);
2634  SecondGuardLoad->setOrdering(llvm::AtomicOrdering::Unordered);
2635  llvm::Value *ShouldDoInit =
2636  Builder.CreateICmpEQ(SecondGuardLoad, getAllOnesInt());
2637  llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
2638  Builder.CreateCondBr(ShouldDoInit, InitBlock, EndBlock);
2639 
2640  // Ok, we ended up getting selected as the initializing thread.
2641  CGF.EmitBlock(InitBlock);
2642  CGF.EHStack.pushCleanup<CallInitThreadAbort>(EHCleanup, GuardAddr);
2643  CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
2644  CGF.PopCleanupBlock();
2646  GuardAddr.getPointer());
2647  Builder.CreateBr(EndBlock);
2648 
2649  CGF.EmitBlock(EndBlock);
2650  }
2651 }
2652 
2653 bool MicrosoftCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
2654  // Null-ness for function memptrs only depends on the first field, which is
2655  // the function pointer. The rest don't matter, so we can zero initialize.
2656  if (MPT->isMemberFunctionPointer())
2657  return true;
2658 
2659  // The virtual base adjustment field is always -1 for null, so if we have one
2660  // we can't zero initialize. The field offset is sometimes also -1 if 0 is a
2661  // valid field offset.
2662  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2663  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2664  return (!inheritanceModelHasVBTableOffsetField(Inheritance) &&
2665  RD->nullFieldOffsetIsZero());
2666 }
2667 
2668 llvm::Type *
2669 MicrosoftCXXABI::ConvertMemberPointerType(const MemberPointerType *MPT) {
2670  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2671  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2673  if (MPT->isMemberFunctionPointer())
2674  fields.push_back(CGM.VoidPtrTy); // FunctionPointerOrVirtualThunk
2675  else
2676  fields.push_back(CGM.IntTy); // FieldOffset
2677 
2679  Inheritance))
2680  fields.push_back(CGM.IntTy);
2681  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
2682  fields.push_back(CGM.IntTy);
2683  if (inheritanceModelHasVBTableOffsetField(Inheritance))
2684  fields.push_back(CGM.IntTy); // VirtualBaseAdjustmentOffset
2685 
2686  if (fields.size() == 1)
2687  return fields[0];
2688  return llvm::StructType::get(CGM.getLLVMContext(), fields);
2689 }
2690 
2691 void MicrosoftCXXABI::
2692 GetNullMemberPointerFields(const MemberPointerType *MPT,
2694  assert(fields.empty());
2695  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2696  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2697  if (MPT->isMemberFunctionPointer()) {
2698  // FunctionPointerOrVirtualThunk
2699  fields.push_back(llvm::Constant::getNullValue(CGM.VoidPtrTy));
2700  } else {
2701  if (RD->nullFieldOffsetIsZero())
2702  fields.push_back(getZeroInt()); // FieldOffset
2703  else
2704  fields.push_back(getAllOnesInt()); // FieldOffset
2705  }
2706 
2708  Inheritance))
2709  fields.push_back(getZeroInt());
2710  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
2711  fields.push_back(getZeroInt());
2712  if (inheritanceModelHasVBTableOffsetField(Inheritance))
2713  fields.push_back(getAllOnesInt());
2714 }
2715 
2716 llvm::Constant *
2717 MicrosoftCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
2719  GetNullMemberPointerFields(MPT, fields);
2720  if (fields.size() == 1)
2721  return fields[0];
2722  llvm::Constant *Res = llvm::ConstantStruct::getAnon(fields);
2723  assert(Res->getType() == ConvertMemberPointerType(MPT));
2724  return Res;
2725 }
2726 
2727 llvm::Constant *
2728 MicrosoftCXXABI::EmitFullMemberPointer(llvm::Constant *FirstField,
2729  bool IsMemberFunction,
2730  const CXXRecordDecl *RD,
2731  CharUnits NonVirtualBaseAdjustment,
2732  unsigned VBTableIndex) {
2733  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2734 
2735  // Single inheritance class member pointer are represented as scalars instead
2736  // of aggregates.
2737  if (inheritanceModelHasOnlyOneField(IsMemberFunction, Inheritance))
2738  return FirstField;
2739 
2741  fields.push_back(FirstField);
2742 
2743  if (inheritanceModelHasNVOffsetField(IsMemberFunction, Inheritance))
2744  fields.push_back(llvm::ConstantInt::get(
2745  CGM.IntTy, NonVirtualBaseAdjustment.getQuantity()));
2746 
2747  if (inheritanceModelHasVBPtrOffsetField(Inheritance)) {
2748  CharUnits Offs = CharUnits::Zero();
2749  if (VBTableIndex)
2750  Offs = getContext().getASTRecordLayout(RD).getVBPtrOffset();
2751  fields.push_back(llvm::ConstantInt::get(CGM.IntTy, Offs.getQuantity()));
2752  }
2753 
2754  // The rest of the fields are adjusted by conversions to a more derived class.
2755  if (inheritanceModelHasVBTableOffsetField(Inheritance))
2756  fields.push_back(llvm::ConstantInt::get(CGM.IntTy, VBTableIndex));
2757 
2758  return llvm::ConstantStruct::getAnon(fields);
2759 }
2760 
2761 llvm::Constant *
2762 MicrosoftCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
2763  CharUnits offset) {
2764  return EmitMemberDataPointer(MPT->getMostRecentCXXRecordDecl(), offset);
2765 }
2766 
2767 llvm::Constant *MicrosoftCXXABI::EmitMemberDataPointer(const CXXRecordDecl *RD,
2768  CharUnits offset) {
2769  if (RD->getMSInheritanceModel() ==
2771  offset -= getContext().getOffsetOfBaseWithVBPtr(RD);
2772  llvm::Constant *FirstField =
2773  llvm::ConstantInt::get(CGM.IntTy, offset.getQuantity());
2774  return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/false, RD,
2775  CharUnits::Zero(), /*VBTableIndex=*/0);
2776 }
2777 
2778 llvm::Constant *MicrosoftCXXABI::EmitMemberPointer(const APValue &MP,
2779  QualType MPType) {
2780  const MemberPointerType *DstTy = MPType->castAs<MemberPointerType>();
2781  const ValueDecl *MPD = MP.getMemberPointerDecl();
2782  if (!MPD)
2783  return EmitNullMemberPointer(DstTy);
2784 
2785  ASTContext &Ctx = getContext();
2786  ArrayRef<const CXXRecordDecl *> MemberPointerPath = MP.getMemberPointerPath();
2787 
2788  llvm::Constant *C;
2789  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MPD)) {
2790  C = EmitMemberFunctionPointer(MD);
2791  } else {
2792  // For a pointer to data member, start off with the offset of the field in
2793  // the class in which it was declared, and convert from there if necessary.
2794  // For indirect field decls, get the outermost anonymous field and use the
2795  // parent class.
2796  CharUnits FieldOffset = Ctx.toCharUnitsFromBits(Ctx.getFieldOffset(MPD));
2797  const FieldDecl *FD = dyn_cast<FieldDecl>(MPD);
2798  if (!FD)
2799  FD = cast<FieldDecl>(*cast<IndirectFieldDecl>(MPD)->chain_begin());
2800  const CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getParent());
2801  RD = RD->getMostRecentNonInjectedDecl();
2802  C = EmitMemberDataPointer(RD, FieldOffset);
2803  }
2804 
2805  if (!MemberPointerPath.empty()) {
2806  const CXXRecordDecl *SrcRD = cast<CXXRecordDecl>(MPD->getDeclContext());
2807  const Type *SrcRecTy = Ctx.getTypeDeclType(SrcRD).getTypePtr();
2808  const MemberPointerType *SrcTy =
2809  Ctx.getMemberPointerType(DstTy->getPointeeType(), SrcRecTy)
2811 
2812  bool DerivedMember = MP.isMemberPointerToDerivedMember();
2813  SmallVector<const CXXBaseSpecifier *, 4> DerivedToBasePath;
2814  const CXXRecordDecl *PrevRD = SrcRD;
2815  for (const CXXRecordDecl *PathElem : MemberPointerPath) {
2816  const CXXRecordDecl *Base = nullptr;
2817  const CXXRecordDecl *Derived = nullptr;
2818  if (DerivedMember) {
2819  Base = PathElem;
2820  Derived = PrevRD;
2821  } else {
2822  Base = PrevRD;
2823  Derived = PathElem;
2824  }
2825  for (const CXXBaseSpecifier &BS : Derived->bases())
2826  if (BS.getType()->getAsCXXRecordDecl()->getCanonicalDecl() ==
2827  Base->getCanonicalDecl())
2828  DerivedToBasePath.push_back(&BS);
2829  PrevRD = PathElem;
2830  }
2831  assert(DerivedToBasePath.size() == MemberPointerPath.size());
2832 
2833  CastKind CK = DerivedMember ? CK_DerivedToBaseMemberPointer
2834  : CK_BaseToDerivedMemberPointer;
2835  C = EmitMemberPointerConversion(SrcTy, DstTy, CK, DerivedToBasePath.begin(),
2836  DerivedToBasePath.end(), C);
2837  }
2838  return C;
2839 }
2840 
2841 llvm::Constant *
2842 MicrosoftCXXABI::EmitMemberFunctionPointer(const CXXMethodDecl *MD) {
2843  assert(MD->isInstance() && "Member function must not be static!");
2844 
2845  CharUnits NonVirtualBaseAdjustment = CharUnits::Zero();
2847  CodeGenTypes &Types = CGM.getTypes();
2848 
2849  unsigned VBTableIndex = 0;
2850  llvm::Constant *FirstField;
2851  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
2852  if (!MD->isVirtual()) {
2853  llvm::Type *Ty;
2854  // Check whether the function has a computable LLVM signature.
2855  if (Types.isFuncTypeConvertible(FPT)) {
2856  // The function has a computable LLVM signature; use the correct type.
2857  Ty = Types.GetFunctionType(Types.arrangeCXXMethodDeclaration(MD));
2858  } else {
2859  // Use an arbitrary non-function type to tell GetAddrOfFunction that the
2860  // function type is incomplete.
2861  Ty = CGM.PtrDiffTy;
2862  }
2863  FirstField = CGM.GetAddrOfFunction(MD, Ty);
2864  } else {
2865  auto &VTableContext = CGM.getMicrosoftVTableContext();
2866  MethodVFTableLocation ML = VTableContext.getMethodVFTableLocation(MD);
2867  FirstField = EmitVirtualMemPtrThunk(MD, ML);
2868  // Include the vfptr adjustment if the method is in a non-primary vftable.
2869  NonVirtualBaseAdjustment += ML.VFPtrOffset;
2870  if (ML.VBase)
2871  VBTableIndex = VTableContext.getVBTableIndex(RD, ML.VBase) * 4;
2872  }
2873 
2874  if (VBTableIndex == 0 &&
2875  RD->getMSInheritanceModel() ==
2877  NonVirtualBaseAdjustment -= getContext().getOffsetOfBaseWithVBPtr(RD);
2878 
2879  // The rest of the fields are common with data member pointers.
2880  FirstField = llvm::ConstantExpr::getBitCast(FirstField, CGM.VoidPtrTy);
2881  return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/true, RD,
2882  NonVirtualBaseAdjustment, VBTableIndex);
2883 }
2884 
2885 /// Member pointers are the same if they're either bitwise identical *or* both
2886 /// null. Null-ness for function members is determined by the first field,
2887 /// while for data member pointers we must compare all fields.
2888 llvm::Value *
2889 MicrosoftCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
2890  llvm::Value *L,
2891  llvm::Value *R,
2892  const MemberPointerType *MPT,
2893  bool Inequality) {
2894  CGBuilderTy &Builder = CGF.Builder;
2895 
2896  // Handle != comparisons by switching the sense of all boolean operations.
2897  llvm::ICmpInst::Predicate Eq;
2898  llvm::Instruction::BinaryOps And, Or;
2899  if (Inequality) {
2900  Eq = llvm::ICmpInst::ICMP_NE;
2901  And = llvm::Instruction::Or;
2903  } else {
2904  Eq = llvm::ICmpInst::ICMP_EQ;
2906  Or = llvm::Instruction::Or;
2907  }
2908 
2909  // If this is a single field member pointer (single inheritance), this is a
2910  // single icmp.
2911  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2912  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2914  Inheritance))
2915  return Builder.CreateICmp(Eq, L, R);
2916 
2917  // Compare the first field.
2918  llvm::Value *L0 = Builder.CreateExtractValue(L, 0, "lhs.0");
2919  llvm::Value *R0 = Builder.CreateExtractValue(R, 0, "rhs.0");
2920  llvm::Value *Cmp0 = Builder.CreateICmp(Eq, L0, R0, "memptr.cmp.first");
2921 
2922  // Compare everything other than the first field.
2923  llvm::Value *Res = nullptr;
2924  llvm::StructType *LType = cast<llvm::StructType>(L->getType());
2925  for (unsigned I = 1, E = LType->getNumElements(); I != E; ++I) {
2926  llvm::Value *LF = Builder.CreateExtractValue(L, I);
2927  llvm::Value *RF = Builder.CreateExtractValue(R, I);
2928  llvm::Value *Cmp = Builder.CreateICmp(Eq, LF, RF, "memptr.cmp.rest");
2929  if (Res)
2930  Res = Builder.CreateBinOp(And, Res, Cmp);
2931  else
2932  Res = Cmp;
2933  }
2934 
2935  // Check if the first field is 0 if this is a function pointer.
2936  if (MPT->isMemberFunctionPointer()) {
2937  // (l1 == r1 && ...) || l0 == 0
2938  llvm::Value *Zero = llvm::Constant::getNullValue(L0->getType());
2939  llvm::Value *IsZero = Builder.CreateICmp(Eq, L0, Zero, "memptr.cmp.iszero");
2940  Res = Builder.CreateBinOp(Or, Res, IsZero);
2941  }
2942 
2943  // Combine the comparison of the first field, which must always be true for
2944  // this comparison to succeeed.
2945  return Builder.CreateBinOp(And, Res, Cmp0, "memptr.cmp");
2946 }
2947 
2948 llvm::Value *
2949 MicrosoftCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
2950  llvm::Value *MemPtr,
2951  const MemberPointerType *MPT) {
2952  CGBuilderTy &Builder = CGF.Builder;
2954  // We only need one field for member functions.
2955  if (MPT->isMemberFunctionPointer())
2956  fields.push_back(llvm::Constant::getNullValue(CGM.VoidPtrTy));
2957  else
2958  GetNullMemberPointerFields(MPT, fields);
2959  assert(!fields.empty());
2960  llvm::Value *FirstField = MemPtr;
2961  if (MemPtr->getType()->isStructTy())
2962  FirstField = Builder.CreateExtractValue(MemPtr, 0);
2963  llvm::Value *Res = Builder.CreateICmpNE(FirstField, fields[0], "memptr.cmp0");
2964 
2965  // For function member pointers, we only need to test the function pointer
2966  // field. The other fields if any can be garbage.
2967  if (MPT->isMemberFunctionPointer())
2968  return Res;
2969 
2970  // Otherwise, emit a series of compares and combine the results.
2971  for (int I = 1, E = fields.size(); I < E; ++I) {
2972  llvm::Value *Field = Builder.CreateExtractValue(MemPtr, I);
2973  llvm::Value *Next = Builder.CreateICmpNE(Field, fields[I], "memptr.cmp");
2974  Res = Builder.CreateOr(Res, Next, "memptr.tobool");
2975  }
2976  return Res;
2977 }
2978 
2979 bool MicrosoftCXXABI::MemberPointerConstantIsNull(const MemberPointerType *MPT,
2980  llvm::Constant *Val) {
2981  // Function pointers are null if the pointer in the first field is null.
2982  if (MPT->isMemberFunctionPointer()) {
2983  llvm::Constant *FirstField = Val->getType()->isStructTy() ?
2984  Val->getAggregateElement(0U) : Val;
2985  return FirstField->isNullValue();
2986  }
2987 
2988  // If it's not a function pointer and it's zero initializable, we can easily
2989  // check zero.
2990  if (isZeroInitializable(MPT) && Val->isNullValue())
2991  return true;
2992 
2993  // Otherwise, break down all the fields for comparison. Hopefully these
2994  // little Constants are reused, while a big null struct might not be.
2996  GetNullMemberPointerFields(MPT, Fields);
2997  if (Fields.size() == 1) {
2998  assert(Val->getType()->isIntegerTy());
2999  return Val == Fields[0];
3000  }
3001 
3002  unsigned I, E;
3003  for (I = 0, E = Fields.size(); I != E; ++I) {
3004  if (Val->getAggregateElement(I) != Fields[I])
3005  break;
3006  }
3007  return I == E;
3008 }
3009 
3010 llvm::Value *
3011 MicrosoftCXXABI::GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
3012  Address This,
3013  llvm::Value *VBPtrOffset,
3014  llvm::Value *VBTableOffset,
3015  llvm::Value **VBPtrOut) {
3016  CGBuilderTy &Builder = CGF.Builder;
3017  // Load the vbtable pointer from the vbptr in the instance.
3018  This = Builder.CreateElementBitCast(This, CGM.Int8Ty);
3019  llvm::Value *VBPtr = Builder.CreateInBoundsGEP(
3020  This.getElementType(), This.getPointer(), VBPtrOffset, "vbptr");
3021  if (VBPtrOut) *VBPtrOut = VBPtr;
3022  VBPtr = Builder.CreateBitCast(VBPtr,
3023  CGM.Int32Ty->getPointerTo(0)->getPointerTo(This.getAddressSpace()));
3024 
3025  CharUnits VBPtrAlign;
3026  if (auto CI = dyn_cast<llvm::ConstantInt>(VBPtrOffset)) {
3027  VBPtrAlign = This.getAlignment().alignmentAtOffset(
3028  CharUnits::fromQuantity(CI->getSExtValue()));
3029  } else {
3030  VBPtrAlign = CGF.getPointerAlign();
3031  }
3032 
3033  llvm::Value *VBTable = Builder.CreateAlignedLoad(
3034  CGM.Int32Ty->getPointerTo(0), VBPtr, VBPtrAlign, "vbtable");
3035 
3036  // Translate from byte offset to table index. It improves analyzability.
3037  llvm::Value *VBTableIndex = Builder.CreateAShr(
3038  VBTableOffset, llvm::ConstantInt::get(VBTableOffset->getType(), 2),
3039  "vbtindex", /*isExact=*/true);
3040 
3041  // Load an i32 offset from the vb-table.
3042  llvm::Value *VBaseOffs =
3043  Builder.CreateInBoundsGEP(CGM.Int32Ty, VBTable, VBTableIndex);
3044  VBaseOffs = Builder.CreateBitCast(VBaseOffs, CGM.Int32Ty->getPointerTo(0));
3045  return Builder.CreateAlignedLoad(CGM.Int32Ty, VBaseOffs,
3046  CharUnits::fromQuantity(4), "vbase_offs");
3047 }
3048 
3049 // Returns an adjusted base cast to i8*, since we do more address arithmetic on
3050 // it.
3051 llvm::Value *MicrosoftCXXABI::AdjustVirtualBase(
3052  CodeGenFunction &CGF, const Expr *E, const CXXRecordDecl *RD,
3053  Address Base, llvm::Value *VBTableOffset, llvm::Value *VBPtrOffset) {
3054  CGBuilderTy &Builder = CGF.Builder;
3055  Base = Builder.CreateElementBitCast(Base, CGM.Int8Ty);
3056  llvm::BasicBlock *OriginalBB = nullptr;
3057  llvm::BasicBlock *SkipAdjustBB = nullptr;
3058  llvm::BasicBlock *VBaseAdjustBB = nullptr;
3059 
3060  // In the unspecified inheritance model, there might not be a vbtable at all,
3061  // in which case we need to skip the virtual base lookup. If there is a
3062  // vbtable, the first entry is a no-op entry that gives back the original
3063  // base, so look for a virtual base adjustment offset of zero.
3064  if (VBPtrOffset) {
3065  OriginalBB = Builder.GetInsertBlock();
3066  VBaseAdjustBB = CGF.createBasicBlock("memptr.vadjust");
3067  SkipAdjustBB = CGF.createBasicBlock("memptr.skip_vadjust");
3068  llvm::Value *IsVirtual =
3069  Builder.CreateICmpNE(VBTableOffset, getZeroInt(),
3070  "memptr.is_vbase");
3071  Builder.CreateCondBr(IsVirtual, VBaseAdjustBB, SkipAdjustBB);
3072  CGF.EmitBlock(VBaseAdjustBB);
3073  }
3074 
3075  // If we weren't given a dynamic vbptr offset, RD should be complete and we'll
3076  // know the vbptr offset.
3077  if (!VBPtrOffset) {
3078  CharUnits offs = CharUnits::Zero();
3079  if (!RD->hasDefinition()) {
3080  DiagnosticsEngine &Diags = CGF.CGM.getDiags();
3081  unsigned DiagID = Diags.getCustomDiagID(
3083  "member pointer representation requires a "
3084  "complete class type for %0 to perform this expression");
3085  Diags.Report(E->getExprLoc(), DiagID) << RD << E->getSourceRange();
3086  } else if (RD->getNumVBases())
3087  offs = getContext().getASTRecordLayout(RD).getVBPtrOffset();
3088  VBPtrOffset = llvm::ConstantInt::get(CGM.IntTy, offs.getQuantity());
3089  }
3090  llvm::Value *VBPtr = nullptr;
3091  llvm::Value *VBaseOffs =
3092  GetVBaseOffsetFromVBPtr(CGF, Base, VBPtrOffset, VBTableOffset, &VBPtr);
3093  llvm::Value *AdjustedBase =
3094  Builder.CreateInBoundsGEP(CGM.Int8Ty, VBPtr, VBaseOffs);
3095 
3096  // Merge control flow with the case where we didn't have to adjust.
3097  if (VBaseAdjustBB) {
3098  Builder.CreateBr(SkipAdjustBB);
3099  CGF.EmitBlock(SkipAdjustBB);
3100  llvm::PHINode *Phi = Builder.CreatePHI(CGM.Int8PtrTy, 2, "memptr.base");
3101  Phi->addIncoming(Base.getPointer(), OriginalBB);
3102  Phi->addIncoming(AdjustedBase, VBaseAdjustBB);
3103  return Phi;
3104  }
3105  return AdjustedBase;
3106 }
3107 
3108 llvm::Value *MicrosoftCXXABI::EmitMemberDataPointerAddress(
3109  CodeGenFunction &CGF, const Expr *E, Address Base, llvm::Value *MemPtr,
3110  const MemberPointerType *MPT) {
3111  assert(MPT->isMemberDataPointer());
3112  unsigned AS = Base.getAddressSpace();
3113  llvm::Type *PType =
3114  CGF.ConvertTypeForMem(MPT->getPointeeType())->getPointerTo(AS);
3115  CGBuilderTy &Builder = CGF.Builder;
3116  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
3117  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
3118 
3119  // Extract the fields we need, regardless of model. We'll apply them if we
3120  // have them.
3121  llvm::Value *FieldOffset = MemPtr;
3122  llvm::Value *VirtualBaseAdjustmentOffset = nullptr;
3123  llvm::Value *VBPtrOffset = nullptr;
3124  if (MemPtr->getType()->isStructTy()) {
3125  // We need to extract values.
3126  unsigned I = 0;
3127  FieldOffset = Builder.CreateExtractValue(MemPtr, I++);
3128  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
3129  VBPtrOffset = Builder.CreateExtractValue(MemPtr, I++);
3130  if (inheritanceModelHasVBTableOffsetField(Inheritance))
3131  VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(MemPtr, I++);
3132  }
3133 
3134  llvm::Value *Addr;
3135  if (VirtualBaseAdjustmentOffset) {
3136  Addr = AdjustVirtualBase(CGF, E, RD, Base, VirtualBaseAdjustmentOffset,
3137  VBPtrOffset);
3138  } else {
3139  Addr = Base.getPointer();
3140  }
3141 
3142  // Cast to char*.
3143  Addr = Builder.CreateBitCast(Addr, CGF.Int8Ty->getPointerTo(AS));
3144 
3145  // Apply the offset, which we assume is non-null.
3146  Addr = Builder.CreateInBoundsGEP(CGF.Int8Ty, Addr, FieldOffset,
3147  "memptr.offset");
3148 
3149  // Cast the address to the appropriate pointer type, adopting the address
3150  // space of the base pointer.
3151  return Builder.CreateBitCast(Addr, PType);
3152 }
3153 
3154 llvm::Value *
3155 MicrosoftCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
3156  const CastExpr *E,
3157  llvm::Value *Src) {
3158  assert(E->getCastKind() == CK_DerivedToBaseMemberPointer ||
3159  E->getCastKind() == CK_BaseToDerivedMemberPointer ||
3160  E->getCastKind() == CK_ReinterpretMemberPointer);
3161 
3162  // Use constant emission if we can.
3163  if (isa<llvm::Constant>(Src))
3164  return EmitMemberPointerConversion(E, cast<llvm::Constant>(Src));
3165 
3166  // We may be adding or dropping fields from the member pointer, so we need
3167  // both types and the inheritance models of both records.
3168  const MemberPointerType *SrcTy =
3170  const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
3171  bool IsFunc = SrcTy->isMemberFunctionPointer();
3172 
3173  // If the classes use the same null representation, reinterpret_cast is a nop.
3174  bool IsReinterpret = E->getCastKind() == CK_ReinterpretMemberPointer;
3175  if (IsReinterpret && IsFunc)
3176  return Src;
3177 
3178  CXXRecordDecl *SrcRD = SrcTy->getMostRecentCXXRecordDecl();
3179  CXXRecordDecl *DstRD = DstTy->getMostRecentCXXRecordDecl();
3180  if (IsReinterpret &&
3181  SrcRD->nullFieldOffsetIsZero() == DstRD->nullFieldOffsetIsZero())
3182  return Src;
3183 
3184  CGBuilderTy &Builder = CGF.Builder;
3185 
3186  // Branch past the conversion if Src is null.
3187  llvm::Value *IsNotNull = EmitMemberPointerIsNotNull(CGF, Src, SrcTy);
3188  llvm::Constant *DstNull = EmitNullMemberPointer(DstTy);
3189 
3190  // C++ 5.2.10p9: The null member pointer value is converted to the null member
3191  // pointer value of the destination type.
3192  if (IsReinterpret) {
3193  // For reinterpret casts, sema ensures that src and dst are both functions
3194  // or data and have the same size, which means the LLVM types should match.
3195  assert(Src->getType() == DstNull->getType());
3196  return Builder.CreateSelect(IsNotNull, Src, DstNull);
3197  }
3198 
3199  llvm::BasicBlock *OriginalBB = Builder.GetInsertBlock();
3200  llvm::BasicBlock *ConvertBB = CGF.createBasicBlock("memptr.convert");
3201  llvm::BasicBlock *ContinueBB = CGF.createBasicBlock("memptr.converted");
3202  Builder.CreateCondBr(IsNotNull, ConvertBB, ContinueBB);
3203  CGF.EmitBlock(ConvertBB);
3204 
3205  llvm::Value *Dst = EmitNonNullMemberPointerConversion(
3206  SrcTy, DstTy, E->getCastKind(), E->path_begin(), E->path_end(), Src,
3207  Builder);
3208 
3209  Builder.CreateBr(ContinueBB);
3210 
3211  // In the continuation, choose between DstNull and Dst.
3212  CGF.EmitBlock(ContinueBB);
3213  llvm::PHINode *Phi = Builder.CreatePHI(DstNull->getType(), 2, "memptr.converted");
3214  Phi->addIncoming(DstNull, OriginalBB);
3215  Phi->addIncoming(Dst, ConvertBB);
3216  return Phi;
3217 }
3218 
3219 llvm::Value *MicrosoftCXXABI::EmitNonNullMemberPointerConversion(
3220  const MemberPointerType *SrcTy, const MemberPointerType *DstTy, CastKind CK,
3223  CGBuilderTy &Builder) {
3224  const CXXRecordDecl *SrcRD = SrcTy->getMostRecentCXXRecordDecl();
3225  const CXXRecordDecl *DstRD = DstTy->getMostRecentCXXRecordDecl();
3226  MSInheritanceModel SrcInheritance = SrcRD->getMSInheritanceModel();
3227  MSInheritanceModel DstInheritance = DstRD->getMSInheritanceModel();
3228  bool IsFunc = SrcTy->isMemberFunctionPointer();
3229  bool IsConstant = isa<llvm::Constant>(Src);
3230 
3231  // Decompose src.
3232  llvm::Value *FirstField = Src;
3233  llvm::Value *NonVirtualBaseAdjustment = getZeroInt();
3234  llvm::Value *VirtualBaseAdjustmentOffset = getZeroInt();
3235  llvm::Value *VBPtrOffset = getZeroInt();
3236  if (!inheritanceModelHasOnlyOneField(IsFunc, SrcInheritance)) {
3237  // We need to extract values.
3238  unsigned I = 0;
3239  FirstField = Builder.CreateExtractValue(Src, I++);
3240  if (inheritanceModelHasNVOffsetField(IsFunc, SrcInheritance))
3241  NonVirtualBaseAdjustment = Builder.CreateExtractValue(Src, I++);
3242  if (inheritanceModelHasVBPtrOffsetField(SrcInheritance))
3243  VBPtrOffset = Builder.CreateExtractValue(Src, I++);
3244  if (inheritanceModelHasVBTableOffsetField(SrcInheritance))
3245  VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(Src, I++);
3246  }
3247 
3248  bool IsDerivedToBase = (CK == CK_DerivedToBaseMemberPointer);
3249  const MemberPointerType *DerivedTy = IsDerivedToBase ? SrcTy : DstTy;
3250  const CXXRecordDecl *DerivedClass = DerivedTy->getMostRecentCXXRecordDecl();
3251 
3252  // For data pointers, we adjust the field offset directly. For functions, we
3253  // have a separate field.
3254  llvm::Value *&NVAdjustField = IsFunc ? NonVirtualBaseAdjustment : FirstField;
3255 
3256  // The virtual inheritance model has a quirk: the virtual base table is always
3257  // referenced when dereferencing a member pointer even if the member pointer
3258  // is non-virtual. This is accounted for by adjusting the non-virtual offset
3259  // to point backwards to the top of the MDC from the first VBase. Undo this
3260  // adjustment to normalize the member pointer.
3261  llvm::Value *SrcVBIndexEqZero =
3262  Builder.CreateICmpEQ(VirtualBaseAdjustmentOffset, getZeroInt());
3263  if (SrcInheritance == MSInheritanceModel::Virtual) {
3264  if (int64_t SrcOffsetToFirstVBase =
3265  getContext().getOffsetOfBaseWithVBPtr(SrcRD).getQuantity()) {
3266  llvm::Value *UndoSrcAdjustment = Builder.CreateSelect(
3267  SrcVBIndexEqZero,
3268  llvm::ConstantInt::get(CGM.IntTy, SrcOffsetToFirstVBase),
3269  getZeroInt());
3270  NVAdjustField = Builder.CreateNSWAdd(NVAdjustField, UndoSrcAdjustment);
3271  }
3272  }
3273 
3274  // A non-zero vbindex implies that we are dealing with a source member in a
3275  // floating virtual base in addition to some non-virtual offset. If the
3276  // vbindex is zero, we are dealing with a source that exists in a non-virtual,
3277  // fixed, base. The difference between these two cases is that the vbindex +
3278  // nvoffset *always* point to the member regardless of what context they are
3279  // evaluated in so long as the vbindex is adjusted. A member inside a fixed
3280  // base requires explicit nv adjustment.
3281  llvm::Constant *BaseClassOffset = llvm::ConstantInt::get(
3282  CGM.IntTy,
3283  CGM.computeNonVirtualBaseClassOffset(DerivedClass, PathBegin, PathEnd)
3284  .getQuantity());
3285 
3286  llvm::Value *NVDisp;
3287  if (IsDerivedToBase)
3288  NVDisp = Builder.CreateNSWSub(NVAdjustField, BaseClassOffset, "adj");
3289  else
3290  NVDisp = Builder.CreateNSWAdd(NVAdjustField, BaseClassOffset, "adj");
3291 
3292  NVAdjustField = Builder.CreateSelect(SrcVBIndexEqZero, NVDisp, getZeroInt());
3293 
3294  // Update the vbindex to an appropriate value in the destination because
3295  // SrcRD's vbtable might not be a strict prefix of the one in DstRD.
3296  llvm::Value *DstVBIndexEqZero = SrcVBIndexEqZero;
3297  if (inheritanceModelHasVBTableOffsetField(DstInheritance) &&
3298  inheritanceModelHasVBTableOffsetField(SrcInheritance)) {
3299  if (llvm::GlobalVariable *VDispMap =
3300  getAddrOfVirtualDisplacementMap(SrcRD, DstRD)) {
3301  llvm::Value *VBIndex = Builder.CreateExactUDiv(
3302  VirtualBaseAdjustmentOffset, llvm::ConstantInt::get(CGM.IntTy, 4));
3303  if (IsConstant) {
3304  llvm::Constant *Mapping = VDispMap->getInitializer();
3305  VirtualBaseAdjustmentOffset =
3306  Mapping->getAggregateElement(cast<llvm::Constant>(VBIndex));
3307  } else {
3308  llvm::Value *Idxs[] = {getZeroInt(), VBIndex};
3309  VirtualBaseAdjustmentOffset = Builder.CreateAlignedLoad(
3310  CGM.IntTy, Builder.CreateInBoundsGEP(VDispMap->getValueType(),
3311  VDispMap, Idxs),
3313  }
3314 
3315  DstVBIndexEqZero =
3316  Builder.CreateICmpEQ(VirtualBaseAdjustmentOffset, getZeroInt());
3317  }
3318  }
3319 
3320  // Set the VBPtrOffset to zero if the vbindex is zero. Otherwise, initialize
3321  // it to the offset of the vbptr.
3322  if (inheritanceModelHasVBPtrOffsetField(DstInheritance)) {
3323  llvm::Value *DstVBPtrOffset = llvm::ConstantInt::get(
3324  CGM.IntTy,
3325  getContext().getASTRecordLayout(DstRD).getVBPtrOffset().getQuantity());
3326  VBPtrOffset =
3327  Builder.CreateSelect(DstVBIndexEqZero, getZeroInt(), DstVBPtrOffset);
3328  }
3329 
3330  // Likewise, apply a similar adjustment so that dereferencing the member
3331  // pointer correctly accounts for the distance between the start of the first
3332  // virtual base and the top of the MDC.
3333  if (DstInheritance == MSInheritanceModel::Virtual) {
3334  if (int64_t DstOffsetToFirstVBase =
3335  getContext().getOffsetOfBaseWithVBPtr(DstRD).getQuantity()) {
3336  llvm::Value *DoDstAdjustment = Builder.CreateSelect(
3337  DstVBIndexEqZero,
3338  llvm::ConstantInt::get(CGM.IntTy, DstOffsetToFirstVBase),
3339  getZeroInt());
3340  NVAdjustField = Builder.CreateNSWSub(NVAdjustField, DoDstAdjustment);
3341  }
3342  }
3343 
3344  // Recompose dst from the null struct and the adjusted fields from src.
3345  llvm::Value *Dst;
3346  if (inheritanceModelHasOnlyOneField(IsFunc, DstInheritance)) {
3347  Dst = FirstField;
3348  } else {
3349  Dst = llvm::UndefValue::get(ConvertMemberPointerType(DstTy));
3350  unsigned Idx = 0;
3351  Dst = Builder.CreateInsertValue(Dst, FirstField, Idx++);
3352  if (inheritanceModelHasNVOffsetField(IsFunc, DstInheritance))
3353  Dst = Builder.CreateInsertValue(Dst, NonVirtualBaseAdjustment, Idx++);
3354  if (inheritanceModelHasVBPtrOffsetField(DstInheritance))
3355  Dst = Builder.CreateInsertValue(Dst, VBPtrOffset, Idx++);
3356  if (inheritanceModelHasVBTableOffsetField(DstInheritance))
3357  Dst = Builder.CreateInsertValue(Dst, VirtualBaseAdjustmentOffset, Idx++);
3358  }
3359  return Dst;
3360 }
3361 
3362 llvm::Constant *
3363 MicrosoftCXXABI::EmitMemberPointerConversion(const CastExpr *E,
3364  llvm::Constant *Src) {
3365  const MemberPointerType *SrcTy =
3367  const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
3368 
3369  CastKind CK = E->getCastKind();
3370 
3371  return EmitMemberPointerConversion(SrcTy, DstTy, CK, E->path_begin(),
3372  E->path_end(), Src);
3373 }
3374 
3375 llvm::Constant *MicrosoftCXXABI::EmitMemberPointerConversion(
3376  const MemberPointerType *SrcTy, const MemberPointerType *DstTy, CastKind CK,
3378  CastExpr::path_const_iterator PathEnd, llvm::Constant *Src) {
3379  assert(CK == CK_DerivedToBaseMemberPointer ||
3380  CK == CK_BaseToDerivedMemberPointer ||
3381  CK == CK_ReinterpretMemberPointer);
3382  // If src is null, emit a new null for dst. We can't return src because dst
3383  // might have a new representation.
3384  if (MemberPointerConstantIsNull(SrcTy, Src))
3385  return EmitNullMemberPointer(DstTy);
3386 
3387  // We don't need to do anything for reinterpret_casts of non-null member
3388  // pointers. We should only get here when the two type representations have
3389  // the same size.
3390  if (CK == CK_ReinterpretMemberPointer)
3391  return Src;
3392 
3393  CGBuilderTy Builder(CGM, CGM.getLLVMContext());
3394  auto *Dst = cast<llvm::Constant>(EmitNonNullMemberPointerConversion(
3395  SrcTy, DstTy, CK, PathBegin, PathEnd, Src, Builder));
3396 
3397  return Dst;
3398 }
3399 
3400 CGCallee MicrosoftCXXABI::EmitLoadOfMemberFunctionPointer(
3401  CodeGenFunction &CGF, const Expr *E, Address This,
3402  llvm::Value *&ThisPtrForCall, llvm::Value *MemPtr,
3403  const MemberPointerType *MPT) {
3404  assert(MPT->isMemberFunctionPointer());
3405  const FunctionProtoType *FPT =
3407  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
3408  llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(
3409  CGM.getTypes().arrangeCXXMethodType(RD, FPT, /*FD=*/nullptr));
3410  CGBuilderTy &Builder = CGF.Builder;
3411 
3412  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
3413 
3414  // Extract the fields we need, regardless of model. We'll apply them if we
3415  // have them.
3416  llvm::Value *FunctionPointer = MemPtr;
3417  llvm::Value *NonVirtualBaseAdjustment = nullptr;
3418  llvm::Value *VirtualBaseAdjustmentOffset = nullptr;
3419  llvm::Value *VBPtrOffset = nullptr;
3420  if (MemPtr->getType()->isStructTy()) {
3421  // We need to extract values.
3422  unsigned I = 0;
3423  FunctionPointer = Builder.CreateExtractValue(MemPtr, I++);
3424  if (inheritanceModelHasNVOffsetField(MPT, Inheritance))
3425  NonVirtualBaseAdjustment = Builder.CreateExtractValue(MemPtr, I++);
3426  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
3427  VBPtrOffset = Builder.CreateExtractValue(MemPtr, I++);
3428  if (inheritanceModelHasVBTableOffsetField(Inheritance))
3429  VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(MemPtr, I++);
3430  }
3431 
3432  if (VirtualBaseAdjustmentOffset) {
3433  ThisPtrForCall = AdjustVirtualBase(CGF, E, RD, This,
3434  VirtualBaseAdjustmentOffset, VBPtrOffset);
3435  } else {
3436  ThisPtrForCall = This.getPointer();
3437  }
3438 
3439  if (NonVirtualBaseAdjustment) {
3440  // Apply the adjustment and cast back to the original struct type.
3441  llvm::Value *Ptr = Builder.CreateBitCast(ThisPtrForCall, CGF.Int8PtrTy);
3442  Ptr = Builder.CreateInBoundsGEP(CGF.Int8Ty, Ptr, NonVirtualBaseAdjustment);
3443  ThisPtrForCall = Builder.CreateBitCast(Ptr, ThisPtrForCall->getType(),
3444  "this.adjusted");
3445  }
3446 
3447  FunctionPointer =
3448  Builder.CreateBitCast(FunctionPointer, FTy->getPointerTo());
3449  CGCallee Callee(FPT, FunctionPointer);
3450  return Callee;
3451 }
3452 
3454  return new MicrosoftCXXABI(CGM);
3455 }
3456 
3457 // MS RTTI Overview:
3458 // The run time type information emitted by cl.exe contains 5 distinct types of
3459 // structures. Many of them reference each other.
3460 //
3461 // TypeInfo: Static classes that are returned by typeid.
3462 //
3463 // CompleteObjectLocator: Referenced by vftables. They contain information
3464 // required for dynamic casting, including OffsetFromTop. They also contain
3465 // a reference to the TypeInfo for the type and a reference to the
3466 // CompleteHierarchyDescriptor for the type.
3467 //
3468 // ClassHierarchyDescriptor: Contains information about a class hierarchy.
3469 // Used during dynamic_cast to walk a class hierarchy. References a base
3470 // class array and the size of said array.
3471 //
3472 // BaseClassArray: Contains a list of classes in a hierarchy. BaseClassArray is
3473 // somewhat of a misnomer because the most derived class is also in the list
3474 // as well as multiple copies of virtual bases (if they occur multiple times
3475 // in the hierarchy.) The BaseClassArray contains one BaseClassDescriptor for
3476 // every path in the hierarchy, in pre-order depth first order. Note, we do
3477 // not declare a specific llvm type for BaseClassArray, it's merely an array
3478 // of BaseClassDescriptor pointers.
3479 //
3480 // BaseClassDescriptor: Contains information about a class in a class hierarchy.
3481 // BaseClassDescriptor is also somewhat of a misnomer for the same reason that
3482 // BaseClassArray is. It contains information about a class within a
3483 // hierarchy such as: is this base is ambiguous and what is its offset in the
3484 // vbtable. The names of the BaseClassDescriptors have all of their fields
3485 // mangled into them so they can be aggressively deduplicated by the linker.
3486 
3487 static llvm::GlobalVariable *getTypeInfoVTable(CodeGenModule &CGM) {
3488  StringRef MangledName("??_7type_info@@6B@");
3489  if (auto VTable = CGM.getModule().getNamedGlobal(MangledName))
3490  return VTable;
3491  return new llvm::GlobalVariable(CGM.getModule(), CGM.Int8PtrTy,
3492  /*isConstant=*/true,
3494  /*Initializer=*/nullptr, MangledName);
3495 }
3496 
3497 namespace {
3498 
3499 /// A Helper struct that stores information about a class in a class
3500 /// hierarchy. The information stored in these structs struct is used during
3501 /// the generation of ClassHierarchyDescriptors and BaseClassDescriptors.
3502 // During RTTI creation, MSRTTIClasses are stored in a contiguous array with
3503 // implicit depth first pre-order tree connectivity. getFirstChild and
3504 // getNextSibling allow us to walk the tree efficiently.
3505 struct MSRTTIClass {
3506  enum {
3507  IsPrivateOnPath = 1 | 8,
3508  IsAmbiguous = 2,
3509  IsPrivate = 4,
3510  IsVirtual = 16,
3511  HasHierarchyDescriptor = 64
3512  };
3513  MSRTTIClass(const CXXRecordDecl *RD) : RD(RD) {}
3514  uint32_t initialize(const MSRTTIClass *Parent,
3515  const CXXBaseSpecifier *Specifier);
3516 
3517  MSRTTIClass *getFirstChild() { return this + 1; }
3518  static MSRTTIClass *getNextChild(MSRTTIClass *Child) {
3519  return Child + 1 + Child->NumBases;
3520  }
3521 
3522  const CXXRecordDecl *RD, *VirtualRoot;
3523  uint32_t Flags, NumBases, OffsetInVBase;
3524 };
3525 
3526 /// Recursively initialize the base class array.
3527 uint32_t MSRTTIClass::initialize(const MSRTTIClass *Parent,
3528  const CXXBaseSpecifier *Specifier) {
3529  Flags = HasHierarchyDescriptor;
3530  if (!Parent) {
3531  VirtualRoot = nullptr;
3532  OffsetInVBase = 0;
3533  } else {
3534  if (Specifier->getAccessSpecifier() != AS_public)
3535  Flags |= IsPrivate | IsPrivateOnPath;
3536  if (Specifier->isVirtual()) {
3537  Flags |= IsVirtual;
3538  VirtualRoot = RD;
3539  OffsetInVBase = 0;
3540  } else {
3541  if (Parent->Flags & IsPrivateOnPath)
3542  Flags |= IsPrivateOnPath;
3543  VirtualRoot = Parent->VirtualRoot;
3544  OffsetInVBase = Parent->OffsetInVBase + RD->getASTContext()
3545  .getASTRecordLayout(Parent->RD).getBaseClassOffset(RD).getQuantity();
3546  }
3547  }
3548  NumBases = 0;
3549  MSRTTIClass *Child = getFirstChild();
3550  for (const CXXBaseSpecifier &Base : RD->bases()) {
3551  NumBases += Child->initialize(this, &Base) + 1;
3552  Child = getNextChild(Child);
3553  }
3554  return NumBases;
3555 }
3556 
3557 static llvm::GlobalValue::LinkageTypes getLinkageForRTTI(QualType Ty) {
3558  switch (Ty->getLinkage()) {
3559  case NoLinkage:
3560  case InternalLinkage:
3561  case UniqueExternalLinkage:
3563 
3564  case VisibleNoLinkage:
3565  case ModuleInternalLinkage:
3566  case ModuleLinkage:
3567  case ExternalLinkage:
3568  return llvm::GlobalValue::LinkOnceODRLinkage;
3569  }
3570  llvm_unreachable("Invalid linkage!");
3571 }
3572 
3573 /// An ephemeral helper class for building MS RTTI types. It caches some
3574 /// calls to the module and information about the most derived class in a
3575 /// hierarchy.
3576 struct MSRTTIBuilder {
3577  enum {
3578  HasBranchingHierarchy = 1,
3579  HasVirtualBranchingHierarchy = 2,
3580  HasAmbiguousBases = 4
3581  };
3582 
3583  MSRTTIBuilder(MicrosoftCXXABI &ABI, const CXXRecordDecl *RD)
3584  : CGM(ABI.CGM), Context(CGM.getContext()),
3585  VMContext(CGM.getLLVMContext()), Module(CGM.getModule()), RD(RD),
3586  Linkage(getLinkageForRTTI(CGM.getContext().getTagDeclType(RD))),
3587  ABI(ABI) {}
3588 
3589  llvm::GlobalVariable *getBaseClassDescriptor(const MSRTTIClass &Classes);
3590  llvm::GlobalVariable *
3591  getBaseClassArray(SmallVectorImpl<MSRTTIClass> &Classes);
3592  llvm::GlobalVariable *getClassHierarchyDescriptor();
3593  llvm::GlobalVariable *getCompleteObjectLocator(const VPtrInfo &Info);
3594 
3595  CodeGenModule &CGM;
3596  ASTContext &Context;
3597  llvm::LLVMContext &VMContext;
3598  llvm::Module &Module;
3599  const CXXRecordDecl *RD;
3600  llvm::GlobalVariable::LinkageTypes Linkage;
3601  MicrosoftCXXABI &ABI;
3602 };
3603 
3604 } // namespace
3605 
3606 /// Recursively serializes a class hierarchy in pre-order depth first
3607 /// order.
3609  const CXXRecordDecl *RD) {
3610  Classes.push_back(MSRTTIClass(RD));
3611  for (const CXXBaseSpecifier &Base : RD->bases())
3612  serializeClassHierarchy(Classes, Base.getType()->getAsCXXRecordDecl());
3613 }
3614 
3615 /// Find ambiguity among base classes.
3616 static void
3621  for (MSRTTIClass *Class = &Classes.front(); Class <= &Classes.back();) {
3622  if ((Class->Flags & MSRTTIClass::IsVirtual) &&
3623  !VirtualBases.insert(Class->RD).second) {
3624  Class = MSRTTIClass::getNextChild(Class);
3625  continue;
3626  }
3627  if (!UniqueBases.insert(Class->RD).second)
3628  AmbiguousBases.insert(Class->RD);
3629  Class++;
3630  }
3631  if (AmbiguousBases.empty())
3632  return;
3633  for (MSRTTIClass &Class : Classes)
3634  if (AmbiguousBases.count(Class.RD))
3635  Class.Flags |= MSRTTIClass::IsAmbiguous;
3636 }
3637 
3638 llvm::GlobalVariable *MSRTTIBuilder::getClassHierarchyDescriptor() {
3639  SmallString<256> MangledName;
3640  {
3641  llvm::raw_svector_ostream Out(MangledName);
3642  ABI.getMangleContext().mangleCXXRTTIClassHierarchyDescriptor(RD, Out);
3643  }
3644 
3645  // Check to see if we've already declared this ClassHierarchyDescriptor.
3646  if (auto CHD = Module.getNamedGlobal(MangledName))
3647  return CHD;
3648 
3649  // Serialize the class hierarchy and initialize the CHD Fields.
3651  serializeClassHierarchy(Classes, RD);
3652  Classes.front().initialize(/*Parent=*/nullptr, /*Specifier=*/nullptr);
3653  detectAmbiguousBases(Classes);
3654  int Flags = 0;
3655  for (auto Class : Classes) {
3656  if (Class.RD->getNumBases() > 1)
3657  Flags |= HasBranchingHierarchy;
3658  // Note: cl.exe does not calculate "HasAmbiguousBases" correctly. We
3659  // believe the field isn't actually used.
3660  if (Class.Flags & MSRTTIClass::IsAmbiguous)
3661  Flags |= HasAmbiguousBases;
3662  }
3663  if ((Flags & HasBranchingHierarchy) && RD->getNumVBases() != 0)
3664  Flags |= HasVirtualBranchingHierarchy;
3665  // These gep indices are used to get the address of the first element of the
3666  // base class array.
3667  llvm::Value *GEPIndices[] = {llvm::ConstantInt::get(CGM.IntTy, 0),
3668  llvm::ConstantInt::get(CGM.IntTy, 0)};
3669 
3670  // Forward-declare the class hierarchy descriptor
3671  auto Type = ABI.getClassHierarchyDescriptorType();
3672  auto CHD = new llvm::GlobalVariable(Module, Type, /*isConstant=*/true, Linkage,
3673  /*Initializer=*/nullptr,
3674  MangledName);
3675  if (CHD->isWeakForLinker())
3676  CHD->setComdat(CGM.getModule().getOrInsertComdat(CHD->getName()));
3677 
3678  auto *Bases = getBaseClassArray(Classes);
3679 
3680  // Initialize the base class ClassHierarchyDescriptor.
3681  llvm::Constant *Fields[] = {
3682  llvm::ConstantInt::get(CGM.IntTy, 0), // reserved by the runtime
3683  llvm::ConstantInt::get(CGM.IntTy, Flags),
3684  llvm::ConstantInt::get(CGM.IntTy, Classes.size()),
3685  ABI.getImageRelativeConstant(llvm::ConstantExpr::getInBoundsGetElementPtr(
3686  Bases->getValueType(), Bases,
3687  llvm::ArrayRef<llvm::Value *>(GEPIndices))),
3688  };
3689  CHD->setInitializer(llvm::ConstantStruct::get(Type, Fields));
3690  return CHD;
3691 }
3692 
3693 llvm::GlobalVariable *
3694 MSRTTIBuilder::getBaseClassArray(SmallVectorImpl<MSRTTIClass> &Classes) {
3695  SmallString<256> MangledName;
3696  {
3697  llvm::raw_svector_ostream Out(MangledName);
3698  ABI.getMangleContext().mangleCXXRTTIBaseClassArray(RD, Out);
3699  }
3700 
3701  // Forward-declare the base class array.
3702  // cl.exe pads the base class array with 1 (in 32 bit mode) or 4 (in 64 bit
3703  // mode) bytes of padding. We provide a pointer sized amount of padding by
3704  // adding +1 to Classes.size(). The sections have pointer alignment and are
3705  // marked pick-any so it shouldn't matter.
3706  llvm::Type *PtrType = ABI.getImageRelativeType(
3707  ABI.getBaseClassDescriptorType()->getPointerTo());
3708  auto *ArrType = llvm::ArrayType::get(PtrType, Classes.size() + 1);
3709  auto *BCA =
3710  new llvm::GlobalVariable(Module, ArrType,
3711  /*isConstant=*/true, Linkage,
3712  /*Initializer=*/nullptr, MangledName);
3713  if (BCA->isWeakForLinker())
3714  BCA->setComdat(CGM.getModule().getOrInsertComdat(BCA->getName()));
3715 
3716  // Initialize the BaseClassArray.
3717  SmallVector<llvm::Constant *, 8> BaseClassArrayData;
3718  for (MSRTTIClass &Class : Classes)
3719  BaseClassArrayData.push_back(
3720  ABI.getImageRelativeConstant(getBaseClassDescriptor(Class)));
3721  BaseClassArrayData.push_back(llvm::Constant::getNullValue(PtrType));
3722  BCA->setInitializer(llvm::ConstantArray::get(ArrType, BaseClassArrayData));
3723  return BCA;
3724 }
3725 
3726 llvm::GlobalVariable *
3727 MSRTTIBuilder::getBaseClassDescriptor(const MSRTTIClass &Class) {
3728  // Compute the fields for the BaseClassDescriptor. They are computed up front
3729  // because they are mangled into the name of the object.
3730  uint32_t OffsetInVBTable = 0;
3731  int32_t VBPtrOffset = -1;
3732  if (Class.VirtualRoot) {
3733  auto &VTableContext = CGM.getMicrosoftVTableContext();
3734  OffsetInVBTable = VTableContext.getVBTableIndex(RD, Class.VirtualRoot) * 4;
3735  VBPtrOffset = Context.getASTRecordLayout(RD).getVBPtrOffset().getQuantity();
3736  }
3737 
3738  SmallString<256> MangledName;
3739  {
3740  llvm::raw_svector_ostream Out(MangledName);
3741  ABI.getMangleContext().mangleCXXRTTIBaseClassDescriptor(
3742  Class.RD, Class.OffsetInVBase, VBPtrOffset, OffsetInVBTable,
3743  Class.Flags, Out);
3744  }
3745 
3746  // Check to see if we've already declared this object.
3747  if (auto BCD = Module.getNamedGlobal(MangledName))
3748  return BCD;
3749 
3750  // Forward-declare the base class descriptor.
3751  auto Type = ABI.getBaseClassDescriptorType();
3752  auto BCD =
3753  new llvm::GlobalVariable(Module, Type, /*isConstant=*/true, Linkage,
3754  /*Initializer=*/nullptr, MangledName);
3755  if (BCD->isWeakForLinker())
3756  BCD->setComdat(CGM.getModule().getOrInsertComdat(BCD->getName()));
3757 
3758  // Initialize the BaseClassDescriptor.
3759  llvm::Constant *Fields[] = {
3760  ABI.getImageRelativeConstant(
3761  ABI.getAddrOfRTTIDescriptor(Context.getTypeDeclType(Class.RD))),
3762  llvm::ConstantInt::get(CGM.IntTy, Class.NumBases),
3763  llvm::ConstantInt::get(CGM.IntTy, Class.OffsetInVBase),
3764  llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset),
3765  llvm::ConstantInt::get(CGM.IntTy, OffsetInVBTable),
3766  llvm::ConstantInt::get(CGM.IntTy, Class.Flags),
3767  ABI.getImageRelativeConstant(
3768  MSRTTIBuilder(ABI, Class.RD).getClassHierarchyDescriptor()),
3769  };
3770  BCD->setInitializer(llvm::ConstantStruct::get(Type, Fields));
3771  return BCD;
3772 }
3773 
3774 llvm::GlobalVariable *
3775 MSRTTIBuilder::getCompleteObjectLocator(const VPtrInfo &Info) {
3776  SmallString<256> MangledName;
3777  {
3778  llvm::raw_svector_ostream Out(MangledName);
3779  ABI.getMangleContext().mangleCXXRTTICompleteObjectLocator(RD, Info.MangledPath, Out);
3780  }
3781 
3782  // Check to see if we've already computed this complete object locator.
3783  if (auto COL = Module.getNamedGlobal(MangledName))
3784  return COL;
3785 
3786  // Compute the fields of the complete object locator.
3787  int OffsetToTop = Info.FullOffsetInMDC.getQuantity();
3788  int VFPtrOffset = 0;
3789  // The offset includes the vtordisp if one exists.
3790  if (const CXXRecordDecl *VBase = Info.getVBaseWithVPtr())
3791  if (Context.getASTRecordLayout(RD)
3793  .find(VBase)
3794  ->second.hasVtorDisp())
3795  VFPtrOffset = Info.NonVirtualOffset.getQuantity() + 4;
3796 
3797  // Forward-declare the complete object locator.
3798  llvm::StructType *Type = ABI.getCompleteObjectLocatorType();
3799  auto COL = new llvm::GlobalVariable(Module, Type, /*isConstant=*/true, Linkage,
3800  /*Initializer=*/nullptr, MangledName);
3801 
3802  // Initialize the CompleteObjectLocator.
3803  llvm::Constant *Fields[] = {
3804  llvm::ConstantInt::get(CGM.IntTy, ABI.isImageRelative()),
3805  llvm::ConstantInt::get(CGM.IntTy, OffsetToTop),
3806  llvm::ConstantInt::get(CGM.IntTy, VFPtrOffset),
3807  ABI.getImageRelativeConstant(
3808  CGM.GetAddrOfRTTIDescriptor(Context.getTypeDeclType(RD))),
3809  ABI.getImageRelativeConstant(getClassHierarchyDescriptor()),
3810  ABI.getImageRelativeConstant(COL),
3811  };
3812  llvm::ArrayRef<llvm::Constant *> FieldsRef(Fields);
3813  if (!ABI.isImageRelative())
3814  FieldsRef = FieldsRef.drop_back();
3815  COL->setInitializer(llvm::ConstantStruct::get(Type, FieldsRef));
3816  if (COL->isWeakForLinker())
3817  COL->setComdat(CGM.getModule().getOrInsertComdat(COL->getName()));
3818  return COL;
3819 }
3820 
3822  bool &IsConst, bool &IsVolatile,
3823  bool &IsUnaligned) {
3824  T = Context.getExceptionObjectType(T);
3825 
3826  // C++14 [except.handle]p3:
3827  // A handler is a match for an exception object of type E if [...]
3828  // - the handler is of type cv T or const T& where T is a pointer type and
3829  // E is a pointer type that can be converted to T by [...]
3830  // - a qualification conversion
3831  IsConst = false;
3832  IsVolatile = false;
3833  IsUnaligned = false;
3834  QualType PointeeType = T->getPointeeType();
3835  if (!PointeeType.isNull()) {
3836  IsConst = PointeeType.isConstQualified();
3837  IsVolatile = PointeeType.isVolatileQualified();
3838  IsUnaligned = PointeeType.getQualifiers().hasUnaligned();
3839  }
3840 
3841  // Member pointer types like "const int A::*" are represented by having RTTI
3842  // for "int A::*" and separately storing the const qualifier.
3843  if (const auto *MPTy = T->getAs<MemberPointerType>())
3844  T = Context.getMemberPointerType(PointeeType.getUnqualifiedType(),
3845  MPTy->getClass());
3846 
3847  // Pointer types like "const int * const *" are represented by having RTTI
3848  // for "const int **" and separately storing the const qualifier.
3849  if (T->isPointerType())
3850  T = Context.getPointerType(PointeeType.getUnqualifiedType());
3851 
3852  return T;
3853 }
3854 
3856 MicrosoftCXXABI::getAddrOfCXXCatchHandlerType(QualType Type,
3857  QualType CatchHandlerType) {
3858  // TypeDescriptors for exceptions never have qualified pointer types,
3859  // qualifiers are stored separately in order to support qualification
3860  // conversions.
3861  bool IsConst, IsVolatile, IsUnaligned;
3862  Type =
3863  decomposeTypeForEH(getContext(), Type, IsConst, IsVolatile, IsUnaligned);
3864 
3865  bool IsReference = CatchHandlerType->isReferenceType();
3866 
3867  uint32_t Flags = 0;
3868  if (IsConst)
3869  Flags |= 1;
3870  if (IsVolatile)
3871  Flags |= 2;
3872  if (IsUnaligned)
3873  Flags |= 4;
3874  if (IsReference)
3875  Flags |= 8;
3876 
3877  return CatchTypeInfo{getAddrOfRTTIDescriptor(Type)->stripPointerCasts(),
3878  Flags};
3879 }
3880 
3881 /// Gets a TypeDescriptor. Returns a llvm::Constant * rather than a
3882 /// llvm::GlobalVariable * because different type descriptors have different
3883 /// types, and need to be abstracted. They are abstracting by casting the
3884 /// address to an Int8PtrTy.
3885 llvm::Constant *MicrosoftCXXABI::getAddrOfRTTIDescriptor(QualType Type) {
3886  SmallString<256> MangledName;
3887  {
3888  llvm::raw_svector_ostream Out(MangledName);
3889  getMangleContext().mangleCXXRTTI(Type, Out);
3890  }
3891 
3892  // Check to see if we've already declared this TypeDescriptor.
3893  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
3894  return llvm::ConstantExpr::getBitCast(GV, CGM.Int8PtrTy);
3895 
3896  // Note for the future: If we would ever like to do deferred emission of
3897  // RTTI, check if emitting vtables opportunistically need any adjustment.
3898 
3899  // Compute the fields for the TypeDescriptor.
3900  SmallString<256> TypeInfoString;
3901  {
3902  llvm::raw_svector_ostream Out(TypeInfoString);
3903  getMangleContext().mangleCXXRTTIName(Type, Out);
3904  }
3905 
3906  // Declare and initialize the TypeDescriptor.
3907  llvm::Constant *Fields[] = {
3908  getTypeInfoVTable(CGM), // VFPtr
3909  llvm::ConstantPointerNull::get(CGM.Int8PtrTy), // Runtime data
3910  llvm::ConstantDataArray::getString(CGM.getLLVMContext(), TypeInfoString)};
3911  llvm::StructType *TypeDescriptorType =
3912  getTypeDescriptorType(TypeInfoString);
3913  auto *Var = new llvm::GlobalVariable(
3914  CGM.getModule(), TypeDescriptorType, /*isConstant=*/false,
3915  getLinkageForRTTI(Type),
3916  llvm::ConstantStruct::get(TypeDescriptorType, Fields),
3917  MangledName);
3918  if (Var->isWeakForLinker())
3919  Var->setComdat(CGM.getModule().getOrInsertComdat(Var->getName()));
3920  return llvm::ConstantExpr::getBitCast(Var, CGM.Int8PtrTy);
3921 }
3922 
3923 /// Gets or a creates a Microsoft CompleteObjectLocator.
3924 llvm::GlobalVariable *
3925 MicrosoftCXXABI::getMSCompleteObjectLocator(const CXXRecordDecl *RD,
3926  const VPtrInfo &Info) {
3927  return MSRTTIBuilder(*this, RD).getCompleteObjectLocator(Info);
3928 }
3929 
3930 void MicrosoftCXXABI::emitCXXStructor(GlobalDecl GD) {
3931  if (auto *ctor = dyn_cast<CXXConstructorDecl>(GD.getDecl())) {
3932  // There are no constructor variants, always emit the complete destructor.
3933  llvm::Function *Fn =
3935  CGM.maybeSetTrivialComdat(*ctor, *Fn);
3936  return;
3937  }
3938 
3939  auto *dtor = cast<CXXDestructorDecl>(GD.getDecl());
3940 
3941  // Emit the base destructor if the base and complete (vbase) destructors are
3942  // equivalent. This effectively implements -mconstructor-aliases as part of
3943  // the ABI.
3944  if (GD.getDtorType() == Dtor_Complete &&
3945  dtor->getParent()->getNumVBases() == 0)
3946  GD = GD.getWithDtorType(Dtor_Base);
3947 
3948  // The base destructor is equivalent to the base destructor of its
3949  // base class if there is exactly one non-virtual base class with a
3950  // non-trivial destructor, there are no fields with a non-trivial
3951  // destructor, and the body of the destructor is trivial.
3952  if (GD.getDtorType() == Dtor_Base && !CGM.TryEmitBaseDestructorAsAlias(dtor))
3953  return;
3954 
3955  llvm::Function *Fn = CGM.codegenCXXStructor(GD);
3956  if (Fn->isWeakForLinker())
3957  Fn->setComdat(CGM.getModule().getOrInsertComdat(Fn->getName()));
3958 }
3959 
3960 llvm::Function *
3961 MicrosoftCXXABI::getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
3962  CXXCtorType CT) {
3963  assert(CT == Ctor_CopyingClosure || CT == Ctor_DefaultClosure);
3964 
3965  // Calculate the mangled name.
3966  SmallString<256> ThunkName;
3967  llvm::raw_svector_ostream Out(ThunkName);
3968  getMangleContext().mangleName(GlobalDecl(CD, CT), Out);
3969 
3970  // If the thunk has been generated previously, just return it.
3971  if (llvm::GlobalValue *GV = CGM.getModule().getNamedValue(ThunkName))
3972  return cast<llvm::Function>(GV);
3973 
3974  // Create the llvm::Function.
3975  const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeMSCtorClosure(CD, CT);
3976  llvm::FunctionType *ThunkTy = CGM.getTypes().GetFunctionType(FnInfo);
3977  const CXXRecordDecl *RD = CD->getParent();
3978  QualType RecordTy = getContext().getRecordType(RD);
3979  llvm::Function *ThunkFn = llvm::Function::Create(
3980  ThunkTy, getLinkageForRTTI(RecordTy), ThunkName.str(), &CGM.getModule());
3981  ThunkFn->setCallingConv(static_cast<llvm::CallingConv::ID>(
3982  FnInfo.getEffectiveCallingConvention()));
3983  if (ThunkFn->isWeakForLinker())
3984  ThunkFn->setComdat(CGM.getModule().getOrInsertComdat(ThunkFn->getName()));
3985  bool IsCopy = CT == Ctor_CopyingClosure;
3986 
3987  // Start codegen.
3988  CodeGenFunction CGF(CGM);
3989  CGF.CurGD = GlobalDecl(CD, Ctor_Complete);
3990 
3991  // Build FunctionArgs.
3992  FunctionArgList FunctionArgs;
3993 
3994  // A constructor always starts with a 'this' pointer as its first argument.
3995  buildThisParam(CGF, FunctionArgs);
3996 
3997  // Following the 'this' pointer is a reference to the source object that we
3998  // are copying from.
3999  ImplicitParamDecl SrcParam(
4000  getContext(), /*DC=*/nullptr, SourceLocation(),
4001  &getContext().Idents.get("src"),
4002  getContext().getLValueReferenceType(RecordTy,
4003  /*SpelledAsLValue=*/true),
4005  if (IsCopy)
4006  FunctionArgs.push_back(&SrcParam);
4007 
4008  // Constructors for classes which utilize virtual bases have an additional
4009  // parameter which indicates whether or not it is being delegated to by a more
4010  // derived constructor.
4011  ImplicitParamDecl IsMostDerived(getContext(), /*DC=*/nullptr,
4012  SourceLocation(),
4013  &getContext().Idents.get("is_most_derived"),
4014  getContext().IntTy, ImplicitParamDecl::Other);
4015  // Only add the parameter to the list if the class has virtual bases.
4016  if (RD->getNumVBases() > 0)
4017  FunctionArgs.push_back(&IsMostDerived);
4018 
4019  // Start defining the function.
4020  auto NL = ApplyDebugLocation::CreateEmpty(CGF);
4021  CGF.StartFunction(GlobalDecl(), FnInfo.getReturnType(), ThunkFn, FnInfo,
4022  FunctionArgs, CD->getLocation(), SourceLocation());
4023  // Create a scope with an artificial location for the body of this function.
4024  auto AL = ApplyDebugLocation::CreateArtificial(CGF);
4025  setCXXABIThisValue(CGF, loadIncomingCXXThis(CGF));
4026  llvm::Value *This = getThisValue(CGF);
4027 
4028  llvm::Value *SrcVal =
4029  IsCopy ? CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(&SrcParam), "src")
4030  : nullptr;
4031 
4032  CallArgList Args;
4033 
4034  // Push the this ptr.
4035  Args.add(RValue::get(This), CD->getThisType());
4036 
4037  // Push the src ptr.
4038  if (SrcVal)
4039  Args.add(RValue::get(SrcVal), SrcParam.getType());
4040 
4041  // Add the rest of the default arguments.
4043  ArrayRef<ParmVarDecl *> params = CD->parameters().drop_front(IsCopy ? 1 : 0);
4044  for (const ParmVarDecl *PD : params) {
4045  assert(PD->hasDefaultArg() && "ctor closure lacks default args");
4046  ArgVec.push_back(PD->getDefaultArg());
4047  }
4048 
4049  CodeGenFunction::RunCleanupsScope Cleanups(CGF);
4050 
4051  const auto *FPT = CD->getType()->castAs<FunctionProtoType>();
4052  CGF.EmitCallArgs(Args, FPT, llvm::makeArrayRef(ArgVec), CD, IsCopy ? 1 : 0);
4053 
4054  // Insert any ABI-specific implicit constructor arguments.
4055  AddedStructorArgCounts ExtraArgs =
4056  addImplicitConstructorArgs(CGF, CD, Ctor_Complete,
4057  /*ForVirtualBase=*/false,
4058  /*Delegating=*/false, Args);
4059  // Call the destructor with our arguments.
4060  llvm::Constant *CalleePtr =
4062  CGCallee Callee =
4063  CGCallee::forDirect(CalleePtr, GlobalDecl(CD, Ctor_Complete));
4064  const CGFunctionInfo &CalleeInfo = CGM.getTypes().arrangeCXXConstructorCall(
4065  Args, CD, Ctor_Complete, ExtraArgs.Prefix, ExtraArgs.Suffix);
4066  CGF.EmitCall(CalleeInfo, Callee, ReturnValueSlot(), Args);
4067 
4068  Cleanups.ForceCleanup();
4069 
4070  // Emit the ret instruction, remove any temporary instructions created for the
4071  // aid of CodeGen.
4073 
4074  return ThunkFn;
4075 }
4076 
4077 llvm::Constant *MicrosoftCXXABI::getCatchableType(QualType T,
4078  uint32_t NVOffset,
4079  int32_t VBPtrOffset,
4080  uint32_t VBIndex) {
4081  assert(!T->isReferenceType());
4082 
4083  CXXRecordDecl *RD = T->getAsCXXRecordDecl();
4084  const CXXConstructorDecl *CD =
4085  RD ? CGM.getContext().getCopyConstructorForExceptionObject(RD) : nullptr;
4087  if (CD)
4088  if (!hasDefaultCXXMethodCC(getContext(), CD) || CD->getNumParams() != 1)
4089  CT = Ctor_CopyingClosure;
4090 
4091  uint32_t Size = getContext().getTypeSizeInChars(T).getQuantity();
4092  SmallString<256> MangledName;
4093  {
4094  llvm::raw_svector_ostream Out(MangledName);
4095  getMangleContext().mangleCXXCatchableType(T, CD, CT, Size, NVOffset,
4096  VBPtrOffset, VBIndex, Out);
4097  }
4098  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
4099  return getImageRelativeConstant(GV);
4100 
4101  // The TypeDescriptor is used by the runtime to determine if a catch handler
4102  // is appropriate for the exception object.
4103  llvm::Constant *TD = getImageRelativeConstant(getAddrOfRTTIDescriptor(T));
4104 
4105  // The runtime is responsible for calling the copy constructor if the
4106  // exception is caught by value.
4107  llvm::Constant *CopyCtor;
4108  if (CD) {
4109  if (CT == Ctor_CopyingClosure)
4110  CopyCtor = getAddrOfCXXCtorClosure(CD, Ctor_CopyingClosure);
4111  else
4112  CopyCtor = CGM.getAddrOfCXXStructor(GlobalDecl(CD, Ctor_Complete));
4113 
4114  CopyCtor = llvm::ConstantExpr::getBitCast(CopyCtor, CGM.Int8PtrTy);
4115  } else {
4116  CopyCtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
4117  }
4118  CopyCtor = getImageRelativeConstant(CopyCtor);
4119 
4120  bool IsScalar = !RD;
4121  bool HasVirtualBases = false;
4122  bool IsStdBadAlloc = false; // std::bad_alloc is special for some reason.
4123  QualType PointeeType = T;
4124  if (T->isPointerType())
4125  PointeeType = T->getPointeeType();
4126  if (const CXXRecordDecl *RD = PointeeType->getAsCXXRecordDecl()) {
4127  HasVirtualBases = RD->getNumVBases() > 0;
4128  if (IdentifierInfo *II = RD->getIdentifier())
4129  IsStdBadAlloc = II->isStr("bad_alloc") && RD->isInStdNamespace();
4130  }
4131 
4132  // Encode the relevant CatchableType properties into the Flags bitfield.
4133  // FIXME: Figure out how bits 2 or 8 can get set.
4134  uint32_t Flags = 0;
4135  if (IsScalar)
4136  Flags |= 1;
4137  if (HasVirtualBases)
4138  Flags |= 4;
4139  if (IsStdBadAlloc)
4140  Flags |= 16;
4141 
4142  llvm::Constant *Fields[] = {
4143  llvm::ConstantInt::get(CGM.IntTy, Flags), // Flags
4144  TD, // TypeDescriptor
4145  llvm::ConstantInt::get(CGM.IntTy, NVOffset), // NonVirtualAdjustment
4146  llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset), // OffsetToVBPtr
4147  llvm::ConstantInt::get(CGM.IntTy, VBIndex), // VBTableIndex
4148  llvm::ConstantInt::get(CGM.IntTy, Size), // Size
4149  CopyCtor // CopyCtor
4150  };
4151  llvm::StructType *CTType = getCatchableTypeType();
4152  auto *GV = new llvm::GlobalVariable(
4153  CGM.getModule(), CTType, /*isConstant=*/true, getLinkageForRTTI(T),
4154  llvm::ConstantStruct::get(CTType, Fields), MangledName);
4155  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4156  GV->setSection(".xdata");
4157  if (GV->isWeakForLinker())
4158  GV->setComdat(CGM.getModule().getOrInsertComdat(GV->getName()));
4159  return getImageRelativeConstant(GV);
4160 }
4161 
4162 llvm::GlobalVariable *MicrosoftCXXABI::getCatchableTypeArray(QualType T) {
4163  assert(!T->isReferenceType());
4164 
4165  // See if we've already generated a CatchableTypeArray for this type before.
4166  llvm::GlobalVariable *&CTA = CatchableTypeArrays[T];
4167  if (CTA)
4168  return CTA;
4169 
4170  // Ensure that we don't have duplicate entries in our CatchableTypeArray by
4171  // using a SmallSetVector. Duplicates may arise due to virtual bases
4172  // occurring more than once in the hierarchy.
4174 
4175  // C++14 [except.handle]p3:
4176  // A handler is a match for an exception object of type E if [...]
4177  // - the handler is of type cv T or cv T& and T is an unambiguous public
4178  // base class of E, or
4179  // - the handler is of type cv T or const T& where T is a pointer type and
4180  // E is a pointer type that can be converted to T by [...]
4181  // - a standard pointer conversion (4.10) not involving conversions to
4182  // pointers to private or protected or ambiguous classes
4183  const CXXRecordDecl *MostDerivedClass = nullptr;
4184  bool IsPointer = T->isPointerType();
4185  if (IsPointer)
4186  MostDerivedClass = T->getPointeeType()->getAsCXXRecordDecl();
4187  else
4188  MostDerivedClass = T->getAsCXXRecordDecl();
4189 
4190  // Collect all the unambiguous public bases of the MostDerivedClass.
4191  if (MostDerivedClass) {
4192  const ASTContext &Context = getContext();
4193  const ASTRecordLayout &MostDerivedLayout =
4194  Context.getASTRecordLayout(MostDerivedClass);
4195  MicrosoftVTableContext &VTableContext = CGM.getMicrosoftVTableContext();
4197  serializeClassHierarchy(Classes, MostDerivedClass);
4198  Classes.front().initialize(/*Parent=*/nullptr, /*Specifier=*/nullptr);
4199  detectAmbiguousBases(Classes);
4200  for (const MSRTTIClass &Class : Classes) {
4201  // Skip any ambiguous or private bases.
4202  if (Class.Flags &
4203  (MSRTTIClass::IsPrivateOnPath | MSRTTIClass::IsAmbiguous))
4204  continue;
4205  // Write down how to convert from a derived pointer to a base pointer.
4206  uint32_t OffsetInVBTable = 0;
4207  int32_t VBPtrOffset = -1;
4208  if (Class.VirtualRoot) {
4209  OffsetInVBTable =
4210  VTableContext.getVBTableIndex(MostDerivedClass, Class.VirtualRoot)*4;
4211  VBPtrOffset = MostDerivedLayout.getVBPtrOffset().getQuantity();
4212  }
4213 
4214  // Turn our record back into a pointer if the exception object is a
4215  // pointer.
4216  QualType RTTITy = QualType(Class.RD->getTypeForDecl(), 0);
4217  if (IsPointer)
4218  RTTITy = Context.getPointerType(RTTITy);
4219  CatchableTypes.insert(getCatchableType(RTTITy, Class.OffsetInVBase,
4220  VBPtrOffset, OffsetInVBTable));
4221  }
4222  }
4223 
4224  // C++14 [except.handle]p3:
4225  // A handler is a match for an exception object of type E if
4226  // - The handler is of type cv T or cv T& and E and T are the same type
4227  // (ignoring the top-level cv-qualifiers)
4228  CatchableTypes.insert(getCatchableType(T));
4229 
4230  // C++14 [except.handle]p3:
4231  // A handler is a match for an exception object of type E if
4232  // - the handler is of type cv T or const T& where T is a pointer type and
4233  // E is a pointer type that can be converted to T by [...]
4234  // - a standard pointer conversion (4.10) not involving conversions to
4235  // pointers to private or protected or ambiguous classes
4236  //
4237  // C++14 [conv.ptr]p2:
4238  // A prvalue of type "pointer to cv T," where T is an object type, can be
4239  // converted to a prvalue of type "pointer to cv void".
4240  if (IsPointer && T->getPointeeType()->isObjectType())
4241  CatchableTypes.insert(getCatchableType(getContext().VoidPtrTy));
4242 
4243  // C++14 [except.handle]p3:
4244  // A handler is a match for an exception object of type E if [...]
4245  // - the handler is of type cv T or const T& where T is a pointer or
4246  // pointer to member type and E is std::nullptr_t.
4247  //
4248  // We cannot possibly list all possible pointer types here, making this
4249  // implementation incompatible with the standard. However, MSVC includes an
4250  // entry for pointer-to-void in this case. Let's do the same.
4251  if (T->isNullPtrType())
4252  CatchableTypes.insert(getCatchableType(getContext().VoidPtrTy));
4253 
4254  uint32_t NumEntries = CatchableTypes.size();
4255  llvm::Type *CTType =
4256  getImageRelativeType(getCatchableTypeType()->getPointerTo());
4257  llvm::ArrayType *AT = llvm::ArrayType::get(CTType, NumEntries);
4258  llvm::StructType *CTAType = getCatchableTypeArrayType(NumEntries);
4259  llvm::Constant *Fields[] = {
4260  llvm::ConstantInt::get(CGM.IntTy, NumEntries), // NumEntries
4261  llvm::ConstantArray::get(
4262  AT, llvm::makeArrayRef(CatchableTypes.begin(),
4263  CatchableTypes.end())) // CatchableTypes
4264  };
4265  SmallString<256> MangledName;
4266  {
4267  llvm::raw_svector_ostream Out(MangledName);
4268  getMangleContext().mangleCXXCatchableTypeArray(T, NumEntries, Out);
4269  }
4270  CTA = new llvm::GlobalVariable(
4271  CGM.getModule(), CTAType, /*isConstant=*/true, getLinkageForRTTI(T),
4272  llvm::ConstantStruct::get(CTAType, Fields), MangledName);
4273  CTA->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4274  CTA->setSection(".xdata");
4275  if (CTA->isWeakForLinker())
4276  CTA->setComdat(CGM.getModule().getOrInsertComdat(CTA->getName()));
4277  return CTA;
4278 }
4279 
4280 llvm::GlobalVariable *MicrosoftCXXABI::getThrowInfo(QualType T) {
4281  bool IsConst, IsVolatile, IsUnaligned;
4282  T = decomposeTypeForEH(getContext(), T, IsConst, IsVolatile, IsUnaligned);
4283 
4284  // The CatchableTypeArray enumerates the various (CV-unqualified) types that
4285  // the exception object may be caught as.
4286  llvm::GlobalVariable *CTA = getCatchableTypeArray(T);
4287  // The first field in a CatchableTypeArray is the number of CatchableTypes.
4288  // This is used as a component of the mangled name which means that we need to
4289  // know what it is in order to see if we have previously generated the
4290  // ThrowInfo.
4291  uint32_t NumEntries =
4292  cast<llvm::ConstantInt>(CTA->getInitializer()->getAggregateElement(0U))
4293  ->getLimitedValue();
4294 
4295  SmallString<256> MangledName;
4296  {
4297  llvm::raw_svector_ostream Out(MangledName);
4298  getMangleContext().mangleCXXThrowInfo(T, IsConst, IsVolatile, IsUnaligned,
4299  NumEntries, Out);
4300  }
4301 
4302  // Reuse a previously generated ThrowInfo if we have generated an appropriate
4303  // one before.
4304  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
4305  return GV;
4306 
4307  // The RTTI TypeDescriptor uses an unqualified type but catch clauses must
4308  // be at least as CV qualified. Encode this requirement into the Flags
4309  // bitfield.
4310  uint32_t Flags = 0;
4311  if (IsConst)
4312  Flags |= 1;
4313  if (IsVolatile)
4314  Flags |= 2;
4315  if (IsUnaligned)
4316  Flags |= 4;
4317 
4318  // The cleanup-function (a destructor) must be called when the exception
4319  // object's lifetime ends.
4320  llvm::Constant *CleanupFn = llvm::Constant::getNullValue(CGM.Int8PtrTy);
4321  if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4322  if (CXXDestructorDecl *DtorD = RD->getDestructor())
4323  if (!DtorD->isTrivial())
4324  CleanupFn = llvm::ConstantExpr::getBitCast(
4326  CGM.Int8PtrTy);
4327  // This is unused as far as we can tell, initialize it to null.
4328  llvm::Constant *ForwardCompat =
4329  getImageRelativeConstant(llvm::Constant::getNullValue(CGM.Int8PtrTy));
4330  llvm::Constant *PointerToCatchableTypes = getImageRelativeConstant(
4331  llvm::ConstantExpr::getBitCast(CTA, CGM.Int8PtrTy));
4332  llvm::StructType *TIType = getThrowInfoType();
4333  llvm::Constant *Fields[] = {
4334  llvm::ConstantInt::get(CGM.IntTy, Flags), // Flags
4335  getImageRelativeConstant(CleanupFn), // CleanupFn
4336  ForwardCompat, // ForwardCompat
4337  PointerToCatchableTypes // CatchableTypeArray
4338  };
4339  auto *GV = new llvm::GlobalVariable(
4340  CGM.getModule(), TIType, /*isConstant=*/true, getLinkageForRTTI(T),
4341  llvm::ConstantStruct::get(TIType, Fields), MangledName.str());
4342  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4343  GV->setSection(".xdata");
4344  if (GV->isWeakForLinker())
4345  GV->setComdat(CGM.getModule().getOrInsertComdat(GV->getName()));
4346  return GV;
4347 }
4348 
4349 void MicrosoftCXXABI::emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) {
4350  const Expr *SubExpr = E->getSubExpr();
4351  assert(SubExpr && "SubExpr cannot be null");
4352  QualType ThrowType = SubExpr->getType();
4353  // The exception object lives on the stack and it's address is passed to the
4354  // runtime function.
4355  Address AI = CGF.CreateMemTemp(ThrowType);
4356  CGF.EmitAnyExprToMem(SubExpr, AI, ThrowType.getQualifiers(),
4357  /*IsInit=*/true);
4358 
4359  // The so-called ThrowInfo is used to describe how the exception object may be
4360  // caught.
4361  llvm::GlobalVariable *TI = getThrowInfo(ThrowType);
4362 
4363  // Call into the runtime to throw the exception.
4364  llvm::Value *Args[] = {
4365  CGF.Builder.CreateBitCast(AI.getPointer(), CGM.Int8PtrTy),
4366  TI
4367  };
4369 }
4370 
4371 std::pair<llvm::Value *, const CXXRecordDecl *>
4372 MicrosoftCXXABI::LoadVTablePtr(CodeGenFunction &CGF, Address This,
4373  const CXXRecordDecl *RD) {
4374  std::tie(This, std::ignore, RD) =
4375  performBaseAdjustment(CGF, This, QualType(RD->getTypeForDecl(), 0));
4376  return {CGF.GetVTablePtr(This, CGM.Int8PtrTy, RD), RD};
4377 }
4378 
4379 bool MicrosoftCXXABI::isPermittedToBeHomogeneousAggregate(
4380  const CXXRecordDecl *CXXRD) const {
4381  // MSVC Windows on Arm64 considers a type not HFA if it is not an
4382  // aggregate according to the C++14 spec. This is not consistent with the
4383  // AAPCS64, but is defacto spec on that platform.
4384  return !CGM.getTarget().getTriple().isAArch64() ||
4385  isTrivialForAArch64MSVC(CXXRD);
4386 }
clang::CodeGen::CodeGenFunction::EmitVTableTypeCheckedLoad
llvm::Value * EmitVTableTypeCheckedLoad(const CXXRecordDecl *RD, llvm::Value *VTable, uint64_t VTableByteOffset)
Emit a type checked load from the given vtable.
Definition: CGClass.cpp:2842
clang::CXXMethodDecl::getThisType
QualType getThisType() const
Return the type of the this pointer.
Definition: DeclCXX.cpp:2451
clang::InternalLinkage
@ InternalLinkage
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:31
clang::CodeGen::CodeGenFunction::ConvertTypeForMem
llvm::Type * ConvertTypeForMem(QualType T)
Definition: CodeGenFunction.cpp:207
clang::ASTContext::getTypeSizeInChars
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
Definition: ASTContext.cpp:2450
clang::GlobalDecl::getDtorType
CXXDtorType getDtorType() const
Definition: GlobalDecl.h:109
clang::ReturnAdjustment::VirtualAdjustment::VBPtrOffset
uint32_t VBPtrOffset
The offset (in bytes) of the vbptr, relative to the beginning of the derived class.
Definition: Thunk.h:45
clang::CodeGen::CodeGenTypeCache::SizeTy
llvm::IntegerType * SizeTy
Definition: CodeGenTypeCache.h:50
max
__DEVICE__ int max(int __a, int __b)
Definition: __clang_cuda_math.h:196
clang::ast_matchers::GtestCmp::Eq
@ Eq
clang::Dtor_Base
@ Dtor_Base
Base object dtor.
Definition: ABI.h:36
clang::CodeGen::CodeGenModule::CreateGlobalInitOrCleanUpFunction
llvm::Function * CreateGlobalInitOrCleanUpFunction(llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI, SourceLocation Loc=SourceLocation(), bool TLS=false)
Definition: CGDeclCXX.cpp:423
clang::CodeGen::CodeGenTypeCache::Int8PtrTy
llvm::PointerType * Int8PtrTy
Definition: CodeGenTypeCache.h:57
clang::ASTRecordLayout::hasExtendableVFPtr
bool hasExtendableVFPtr() const
hasVFPtr - Does this class have a virtual function table pointer that can be extended by a derived cl...
Definition: RecordLayout.h:288
llvm
Definition: Dominators.h:30
clang::CXXConstructorDecl
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2401
clang::ASTContext::getTypeDeclType
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:1538
clang::CodeGen::ConstantAddress
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:74
clang::FunctionDecl::getNumParams
unsigned getNumParams() const
Return the number of parameters this function must have based on its FunctionType.
Definition: Decl.cpp:3380
clang::CodeGen::CodeGenFunction::EmitMustTailThunk
void EmitMustTailThunk(GlobalDecl GD, llvm::Value *AdjustedThisPtr, llvm::FunctionCallee Callee)
Emit a musttail call for a thunk with a potentially adjusted this pointer.
Definition: CGVTables.cpp:392
mangleVFTableName
static void mangleVFTableName(MicrosoftMangleContext &MangleContext, const CXXRecordDecl *RD, const VPtrInfo &VFPtr, SmallString< 256 > &Name)
Definition: MicrosoftCXXABI.cpp:1755
clang::CharUnits::getAsAlign
llvm::Align getAsAlign() const
getAsAlign - Returns Quantity as a valid llvm::Align, Beware llvm::Align assumes power of two 8-bit b...
Definition: CharUnits.h:183
clang::VarDecl::getTLSKind
TLSKind getTLSKind() const
Definition: Decl.cpp:2051
clang::CodeGen::CodeGenTypeCache::IntTy
llvm::IntegerType * IntTy
int
Definition: CodeGenTypeCache.h:42
clang::CodeGen::RValue
RValue - This trivial value class is used to represent the result of an expression that is evaluated.
Definition: CGValue.h:39
clang::CodeGen::CodeGenModule::CreateRuntimeFunction
llvm::FunctionCallee CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList(), bool Local=false, bool AssumeConvergent=false)
Create or return a runtime function declaration with the specified type and name.
Definition: CodeGenModule.cpp:3792
clang::index::SymbolKind::Class
@ Class
type
clang::VPtrInfo::IntroducingObject
const CXXRecordDecl * IntroducingObject
This is the class that introduced the vptr by declaring new virtual methods or virtual bases.
Definition: VTableBuilder.h:459
clang::CodeGen::ConstantInitBuilder
The standard implementation of ConstantInitBuilder used in Clang.
Definition: ConstantInitBuilder.h:535
clang::initialize
void initialize(TemplateInstantiationCallbackPtrs &Callbacks, const Sema &TheSema)
Definition: TemplateInstCallback.h:43
clang::CodeGen::CodeGenFunction::EmitCall
RValue EmitCall(const CGFunctionInfo &CallInfo, const CGCallee &Callee, ReturnValueSlot ReturnValue, const CallArgList &Args, llvm::CallBase **callOrInvoke, bool IsMustTail, SourceLocation Loc)
EmitCall - Generate a call of the given function, expecting the given result type,...
Definition: CGCall.cpp:4616
Ret
static bool Ret(InterpState &S, CodePtr &PC, APValue &Result)
Definition: Interp.cpp:34
isTrivialForAArch64MSVC
static bool isTrivialForAArch64MSVC(const CXXRecordDecl *RD)
Definition: MicrosoftCXXABI.cpp:1082
clang::CodeGen::CodeGenFunction::EmitCXXGuardedInitBranch
void EmitCXXGuardedInitBranch(llvm::Value *NeedsInit, llvm::BasicBlock *InitBlock, llvm::BasicBlock *NoInitBlock, GuardKind Kind, const VarDecl *D)
Emit a branch to select whether or not to perform guarded initialization.
Definition: CGDeclCXX.cpp:386
getInitThreadAbortFn
static llvm::FunctionCallee getInitThreadAbortFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2445
clang::CodeGen::ABIArgInfo::getIndirect
static ABIArgInfo getIndirect(CharUnits Alignment, bool ByVal=true, bool Realign=false, llvm::Type *Padding=nullptr)
Definition: CGFunctionInfo.h:198
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:547
clang::CodeGen::CodeGenFunction::CurCodeDecl
const Decl * CurCodeDecl
CurCodeDecl - This is the inner-most code context, which includes blocks.
Definition: CodeGenFunction.h:327
clang::CodeGen::CodeGenModule::addUsedGlobal
void addUsedGlobal(llvm::GlobalValue *GV)
Add a global to a list to be added to the llvm.used metadata.
Definition: CodeGenModule.cpp:2205
clang::QualType::isConstQualified
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6483
clang::CodeGen::CodeGenFunction::EmitNounwindRuntimeCall
llvm::CallInst * EmitNounwindRuntimeCall(llvm::FunctionCallee callee, const Twine &name="")
clang::CodeGen::CodeGenFunction::AutoVarEmission::getObjectAddress
Address getObjectAddress(CodeGenFunction &CGF) const
Returns the address of the object within this declaration.
Definition: CodeGenFunction.h:3077
clang::CodeGen::CodeGenModule::codegenCXXStructor
llvm::Function * codegenCXXStructor(GlobalDecl GD)
Definition: CGCXX.cpp:207
clang::CodeGen::CodeGenModule::GetAddrOfFunction
llvm::Constant * GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty=nullptr, bool ForVTable=false, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Return the address of the given function.
Definition: CodeGenModule.cpp:3712
clang::GlobalDecl::getWithCtorType
GlobalDecl getWithCtorType(CXXCtorType Type)
Definition: GlobalDecl.h:164
clang::NamedDecl::isExternallyVisible
bool isExternallyVisible() const
Definition: Decl.h:407
clang::VisibleNoLinkage
@ VisibleNoLinkage
No linkage according to the standard, but is visible from other translation units because of types de...
Definition: Linkage.h:44
llvm::SmallVector< std::unique_ptr< VPtrInfo >, 2 >
clang::IdentifierTable::get
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
Definition: IdentifierTable.h:592
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:88
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6451
clang::VTableComponent
Represents a single component in a vtable.
Definition: VTableBuilder.h:30
clang::CodeGen::CGCXXABI::getMangleContext
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:97
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:249
clang::CodeGen::CodeGenFunction::GenerateCXXGlobalInitFunc
void GenerateCXXGlobalInitFunc(llvm::Function *Fn, ArrayRef< llvm::Function * > CXXThreadLocals, ConstantAddress Guard=ConstantAddress::invalid())
GenerateCXXGlobalInitFunc - Generates code for initializing global variables.
Definition: CGDeclCXX.cpp:812
clang::CodeGen::CGCXXABI::AddedStructorArgs
Additional implicit arguments to add to the beginning (Prefix) and end (Suffix) of a constructor / de...
Definition: CGCXXABI.h:299
clang::CodeGen::CodeGenFunction::PopCleanupBlock
void PopCleanupBlock(bool FallThroughIsBranchThrough=false)
PopCleanupBlock - Will pop the cleanup entry on the stack and process all branch fixups.
Definition: CGCleanup.cpp:647
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3524
CXXInheritance.h
clang::Stmt::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:324
clang::CodeGen::CodeGenTypeCache::getPointerAlign
CharUnits getPointerAlign() const
Definition: CodeGenTypeCache.h:117
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:673
clang::TypeDecl::getTypeForDecl
const Type * getTypeForDecl() const
Definition: Decl.h:3162
Attr.h
clang::CXXRecordDecl::hasNonTrivialCopyAssignment
bool hasNonTrivialCopyAssignment() const
Determine whether this class has a non-trivial copy assignment operator (C++ [class....
Definition: DeclCXX.h:1279
AttributeLangSupport::C
@ C
Definition: SemaDeclAttr.cpp:54
clang::ASTRecordLayout::getBaseClassOffset
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:249
clang::cast
U cast(CodeGen::Address addr)
Definition: Address.h:108
clang::GVALinkage
GVALinkage
A more specific kind of linkage than enum Linkage.
Definition: Linkage.h:73
clang::CodeGen::CodeGenModule::getContext
ASTContext & getContext() const
Definition: CodeGenModule.h:702
isDeletingDtor
static bool isDeletingDtor(GlobalDecl GD)
Definition: MicrosoftCXXABI.cpp:1073
clang::FieldDecl
Represents a member of a struct/union/class.
Definition: Decl.h:2835
clang::DiagnosticsEngine
Concrete class used by the front-end to report problems and issues.
Definition: Diagnostic.h:191
clang::ParmVarDecl
Represents a parameter to a function.
Definition: Decl.h:1665
DeclCXX.h
clang::CodeGen::CodeGenFunction::createBasicBlock
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
Definition: CodeGenFunction.h:2394
clang::CXXNewExpr
Represents a new-expression for memory allocation and constructor calls, e.g: "new CXXNewExpr(foo)".
Definition: ExprCXX.h:2139
clang::CodeGen::CGBuilderTy::CreateStore
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:95
TargetInfo.h
clang::CodeGen::CodeGenFunction::EmitNoreturnRuntimeCallOrInvoke
void EmitNoreturnRuntimeCallOrInvoke(llvm::FunctionCallee callee, ArrayRef< llvm::Value * > args)
Emits a call or invoke to the given noreturn runtime function.
Definition: CGCall.cpp:4442
llvm::SmallPtrSet
Definition: ASTContext.h:82
clang::MemberPointerType::isMemberFunctionPointer
bool isMemberFunctionPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2851
clang::Ctor_Base
@ Ctor_Base
Base object ctor.
Definition: ABI.h:26
clang::Ctor_Complete
@ Ctor_Complete
Complete object ctor.
Definition: ABI.h:25
clang::QualType::isVolatileQualified
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6494
clang::CodeGen::CGFunctionInfo::getEffectiveCallingConvention
unsigned getEffectiveCallingConvention() const
getEffectiveCallingConvention - Return the actual calling convention to use, which may depend on the ...
Definition: CGFunctionInfo.h:689
clang::CodeGen::EHCleanup
@ EHCleanup
Denotes a cleanup that should run when a scope is exited using exceptional control flow (a throw stat...
Definition: EHScopeStack.h:80
clang::index::SymbolRole::Call
@ Call
clang::VTableLayout::vtable_components
ArrayRef< VTableComponent > vtable_components() const
Definition: VTableBuilder.h:272
clang::ReturnAdjustment::Virtual
union clang::ReturnAdjustment::VirtualAdjustment Virtual
clang::CodeGen::CodeGenTypeCache::getIntAlign
CharUnits getIntAlign() const
Definition: CodeGenTypeCache.h:87
clang::CodeGen::CGBuilderTy
Definition: CGBuilder.h:43
clang::CodeGen::CodeGenModule::computeNonVirtualBaseClassOffset
CharUnits computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass, CastExpr::path_const_iterator Start, CastExpr::path_const_iterator End)
Definition: CGClass.cpp:168
clang::CodeGen::CGFunctionInfo::getReturnType
CanQualType getReturnType() const
Definition: CGFunctionInfo.h:706
clang::CodeGen::CallArgList::add
void add(RValue rvalue, QualType type)
Definition: CGCall.h:288
getInitThreadFooterFn
static llvm::FunctionCallee getInitThreadFooterFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2433
clang::CodeGen::CodeGenFunction::Builder
CGBuilderTy Builder
Definition: CodeGenFunction.h:274
clang::APValue::getMemberPointerDecl
const ValueDecl * getMemberPointerDecl() const
Definition: APValue.cpp:976
clang::Ctor_CopyingClosure
@ Ctor_CopyingClosure
Copying closure variant of a ctor.
Definition: ABI.h:28
clang::Dtor_Complete
@ Dtor_Complete
Complete object dtor.
Definition: ABI.h:35
clang::CodeGen::CodeGenModule::getMangledName
StringRef getMangledName(GlobalDecl GD)
Definition: CodeGenModule.cpp:1351
clang::CodeGen::CGBuilderTy::CreateBitCast
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:151
clang::FunctionProtoType::isVariadic
bool isVariadic() const
Whether this function prototype is variadic.
Definition: Type.h:4217
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1490
clang::CodeGen::CodeGenTypeCache::VoidPtrTy
llvm::PointerType * VoidPtrTy
Definition: CodeGenTypeCache.h:56
clang::CodeGen::CodeGenFunction::EmitTypeMetadataCodeForVCall
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:2673
Decl.h
clang::CodeGen::CodeGenFunction::GetAddrOfLocalVar
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
Definition: CodeGenFunction.h:2679
clang::ThisAdjustment::VirtualAdjustment::VtordispOffset
int32_t VtordispOffset
The offset of the vtordisp (in bytes), relative to the ECX.
Definition: Thunk.h:108
clang::CXXThrowExpr
A C++ throw-expression (C++ [except.throw]).
Definition: ExprCXX.h:1181
Offset
unsigned Offset
Definition: Format.cpp:2335
clang::CodeGen::CodeGenFunction::EmitCXXDestructorCall
void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, bool ForVirtualBase, bool Delegating, Address This, QualType ThisTy)
Definition: CGClass.cpp:2442
clang::CodeGen::CodeGenModule::GetGlobalValue
llvm::GlobalValue * GetGlobalValue(StringRef Ref)
Definition: CodeGenModule.cpp:1425
clang::GlobalDecl
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:55
clang::CodeGen::CodeGenFunction::ShouldEmitVTableTypeCheckedLoad
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:2825
clang::Ctor_DefaultClosure
@ Ctor_DefaultClosure
Default closure variant of a ctor.
Definition: ABI.h:29
clang::ASTContext::getTypeAlignInChars
CharUnits getTypeAlignInChars(QualType T) const
Return the ABI-specified alignment of a (complete) type T, in characters.
Definition: ASTContext.cpp:2459
classifyReturnType
static bool classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI, const ABIInfo &Info)
Definition: TargetInfo.cpp:175
U
clang::CodeGen::ReturnValueSlot
ReturnValueSlot - Contains the address where the return value of a function can be stored,...
Definition: CGCall.h:362
clang::VPtrInfo::NonVirtualOffset
CharUnits NonVirtualOffset
IntroducingObject is at this offset from its containing complete object or virtual base.
Definition: VTableBuilder.h:463
clang::TypeInfo
Definition: ASTContext.h:182
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6684
V
#define V(N, I)
Definition: ASTContext.h:3121
clang::ast_matchers::expr
const internal::VariadicDynCastAllOfMatcher< Stmt, Expr > expr
Matches expressions.
Definition: ASTMatchersInternal.cpp:889
clang::CodeGen::CodeGenFunction::RunCleanupsScope
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited.
Definition: CodeGenFunction.h:838
clang::GlobalDecl::getWithDtorType
GlobalDecl getWithDtorType(CXXDtorType Type)
Definition: GlobalDecl.h:171
clang::CodeGen::CodeGenFunction::VPtr::NearestVBase
const CXXRecordDecl * NearestVBase
Definition: CodeGenFunction.h:2233
clang::MangleContext
MangleContext - Context for tracking state which persists across multiple calls to the C++ name mangl...
Definition: Mangle.h:44
clang::CXXCtorType
CXXCtorType
C++ constructor types.
Definition: ABI.h:24
clang::Module
Describes a module or submodule.
Definition: Module.h:96
getTypeInfoVTable
static llvm::GlobalVariable * getTypeInfoVTable(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:3487
clang::CodeGen::CodeGenFunction::GuardKind::VariableGuard
@ VariableGuard
clang::NoLinkage
@ NoLinkage
No linkage, which means that the entity is unique and can only be referred to from within its scope.
Definition: Linkage.h:26
clang::CodeGen::EHScopeStack::Cleanup
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:141
clang::CXXMethodDecl::isInstance
bool isInstance() const
Definition: DeclCXX.h:1975
clang::CodeGen::CodeGenModule::getVBaseAlignment
CharUnits getVBaseAlignment(CharUnits DerivedAlign, const CXXRecordDecl *Derived, const CXXRecordDecl *VBase)
Returns the assumed alignment of a virtual base of a class.
Definition: CGClass.cpp:74
clang::Linkage
Linkage
Describes the different kinds of linkage (C++ [basic.link], C99 6.2.2) that an entity may have.
Definition: Linkage.h:23
clang::CXXRecordDecl::isVirtuallyDerivedFrom
bool isVirtuallyDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is virtually derived from the class Base.
Definition: CXXInheritance.cpp:89
clang::ASTContext::getDefaultCallingConvention
CallingConv getDefaultCallingConvention(bool IsVariadic, bool IsCXXMethod, bool IsBuiltin=false) const
Retrieves the default calling convention for the current target.
Definition: ASTContext.cpp:11131
clang::VarDecl::isStaticLocal
bool isStaticLocal() const
Returns true if a variable with function scope is a static local variable.
Definition: Decl.h:1125
clang::Type::isNullPtrType
bool isNullPtrType() const
Definition: Type.h:6980
clang::XRayInstrKind::None
constexpr XRayInstrMask None
Definition: XRayInstr.h:38
clang::inheritanceModelHasVBTableOffsetField
bool inheritanceModelHasVBTableOffsetField(MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:377
clang::BaseSubobject
Definition: BaseSubobject.h:30
clang::CodeGen::CodeGenFunction::AutoVarEmission
Definition: CodeGenFunction.h:3013
clang::Decl::isInStdNamespace
bool isInStdNamespace() const
Definition: DeclBase.cpp:394
clang::syntax::NodeRole::Callee
@ Callee
clang::CharUnits::fromQuantity
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
clang::CodeGen::CodeGenFunction::EmitCastToVoidPtr
llvm::Value * EmitCastToVoidPtr(llvm::Value *value)
Emit a cast to void* in the appropriate address space.
Definition: CGExpr.cpp:54
clang::AS_public
@ AS_public
Definition: Specifiers.h:109
clang::MethodVFTableLocation::VBase
const CXXRecordDecl * VBase
If nonnull, holds the last vbase which contains the vfptr that the method definition is adjusted to.
Definition: VTableBuilder.h:516
clang::index::SymbolRole::Implicit
@ Implicit
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:212
clang::ASTContext::getSizeType
CanQualType getSizeType() const
Return the unique type for "size_t" (C99 7.17), defined in <stddef.h>.
Definition: ASTContext.cpp:5709
clang::CodeGen::CodeGenModule::maybeSetTrivialComdat
void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO)
Definition: CodeGenModule.cpp:4318
clang::ReturnAdjustment::VirtualAdjustment::Microsoft
struct clang::ReturnAdjustment::VirtualAdjustment::@176 Microsoft
clang::CXXDtorType
CXXDtorType
C++ destructor types.
Definition: ABI.h:33
clang::MemberPointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2847
clang::CodeGen::CodeGenFunction::EmitRuntimeCall
llvm::CallInst * EmitRuntimeCall(llvm::FunctionCallee callee, const Twine &name="")
clang::MicrosoftVTableContext::getVFPtrOffsets
const VPtrInfoVector & getVFPtrOffsets(const CXXRecordDecl *RD)
Definition: VTableBuilder.cpp:3761
CGCleanup.h
clang::MethodVFTableLocation::Index
uint64_t Index
Method's index in the vftable.
Definition: VTableBuilder.h:523
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:7161
clang::DiagnosticsEngine::Error
@ Error
Definition: Diagnostic.h:199
clang::CodeGen::CGCXXABI::RecordArgABI
RecordArgABI
Specify how one should pass an argument of a record type.
Definition: CGCXXABI.h:128
clang::CXXRecordDecl::getNumBases
unsigned getNumBases() const
Retrieves the number of base classes of this class.
Definition: DeclCXX.h:583
clang::UniqueExternalLinkage
@ UniqueExternalLinkage
External linkage within a unique namespace.
Definition: Linkage.h:40
clang::TypeInfo::isAlignRequired
bool isAlignRequired()
Definition: ASTContext.h:191
clang::CastExpr::path_begin
path_iterator path_begin()
Definition: Expr.h:3544
clang::CodeGen::CodeGenTypeCache::VoidTy
llvm::Type * VoidTy
void
Definition: CodeGenTypeCache.h:34
clang::MicrosoftVTableContext::getVFTableLayout
const VTableLayout & getVFTableLayout(const CXXRecordDecl *RD, CharUnits VFPtrOffset)
Definition: VTableBuilder.cpp:3769
clang::CXXRecordDecl::ctors
ctor_range ctors() const
Definition: DeclCXX.h:651
clang::VPtrInfo::getVBaseWithVPtr
const CXXRecordDecl * getVBaseWithVPtr() const
The vptr is stored inside the non-virtual component of this virtual base.
Definition: VTableBuilder.h:490
clang::CodeGen::CodeGenModule::getModule
llvm::Module & getModule() const
Definition: CodeGenModule.h:709
clang::index::SymbolKind::Field
@ Field
clang::CXXDestructorDecl
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2668
clang::CodeGen::CodeGenTypeCache::getIntSize
CharUnits getIntSize() const
Definition: CodeGenTypeCache.h:84
clang::ImplicitParamDecl
Definition: Decl.h:1601
clang::CXXRecordDecl::isPOD
bool isPOD() const
Whether this class is a POD-type (C++ [class]p4)
Definition: DeclCXX.h:1126
llvm::SmallString
Definition: LLVM.h:37
clang::interp::Zero
bool Zero(InterpState &S, CodePtr OpPC)
Definition: Interp.h:814
clang::CallingConv
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:263
clang::ASTRecordLayout::getVBPtrOffset
CharUnits getVBPtrOffset() const
getVBPtrOffset - Get the offset for virtual base table pointer.
Definition: RecordLayout.h:324
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:876
clang::CodeGen::CodeGenFunction::registerGlobalDtorWithAtExit
void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::FunctionCallee fn, llvm::Constant *addr)
Call atexit() with a function that passes the given argument to the given function.
Definition: CGDeclCXX.cpp:318
clang::Type::getPointeeType
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:625
clang::CXXDeleteExpr::getOperatorDelete
FunctionDecl * getOperatorDelete() const
Definition: ExprCXX.h:2437
clang::CodeGen::CodeGenFunction::GetVTablePtr
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:2623
clang::CodeGen::CodeGenModule::getTypes
CodeGenTypes & getTypes()
Definition: CodeGenModule.h:726
clang::ReturnAdjustment
A return adjustment.
Definition: Thunk.h:26
llvm::DenseSet
Definition: Sema.h:78
clang::Type::getAsCXXRecordDecl
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1760
emitRTtypeidCall
static llvm::CallBase * emitRTtypeidCall(CodeGenFunction &CGF, llvm::Value *Argument)
Definition: MicrosoftCXXABI.cpp:959
clang::CXXRecordDecl::bases
base_class_range bases()
Definition: DeclCXX.h:589
clang::MemberPointerType::isMemberDataPointer
bool isMemberDataPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2857
clang::CodeGen::CodeGenFunction::EmitAutoVarAlloca
AutoVarEmission EmitAutoVarAlloca(const VarDecl &var)
EmitAutoVarAlloca - Emit the alloca and debug information for a local variable.
Definition: CGDecl.cpp:1415
clang::CodeGen::CodeGenFunction::getLLVMContext
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenFunction.h:1990
clang::CodeGen::CGBuilderTy::CreateConstInBoundsByteGEP
Address CreateConstInBoundsByteGEP(Address Addr, CharUnits Offset, const llvm::Twine &Name="")
Given a pointer to i8, adjust it by a given constant offset.
Definition: CGBuilder.h:254
clang::CodeGen::NormalCleanup
@ NormalCleanup
Denotes a cleanup that should run when a scope is exited using normal control flow (falling off the e...
Definition: EHScopeStack.h:84
clang::VPtrInfo
Holds information about the inheritance path to a virtual base or function table pointer.
Definition: VTableBuilder.h:446
clang::CharUnits::Zero
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:53
clang::CodeGen::CodeGenFunction::FinishFunction
void FinishFunction(SourceLocation EndLoc=SourceLocation())
FinishFunction - Complete IR generation of the current function.
Definition: CodeGenFunction.cpp:324
clang::CodeGen::Address
An aligned address.
Definition: Address.h:24
Base
CodeGenModule.h
emitGlobalDtorWithTLRegDtor
static void emitGlobalDtorWithTLRegDtor(CodeGenFunction &CGF, const VarDecl &VD, llvm::FunctionCallee Dtor, llvm::Constant *Addr)
Definition: MicrosoftCXXABI.cpp:2316
clang::CodeGen::CodeGenModule::AppendLinkerOptions
void AppendLinkerOptions(StringRef Opts)
Appends Opts to the "llvm.linker.options" metadata value.
Definition: CodeGenModule.cpp:2257
clang::Qualifiers::hasUnaligned
bool hasUnaligned() const
Definition: Type.h:301
clang::CXXRecordDecl::getMSInheritanceModel
MSInheritanceModel getMSInheritanceModel() const
Returns the inheritance model used for this record.
Definition: MicrosoftCXXABI.cpp:219
clang::CXXRecordDecl::vbases
base_class_range vbases()
Definition: DeclCXX.h:606
clang::CastExpr::getCastKind
CastKind getCastKind() const
Definition: Expr.h:3518
clang::CodeGen::CodeGenFunction::EmitAnyExprToMem
void EmitAnyExprToMem(const Expr *E, Address Location, Qualifiers Quals, bool IsInitializer)
EmitAnyExprToMem - Emits the code necessary to evaluate an arbitrary expression into the given memory...
Definition: CGExpr.cpp:231
clang::CodeGen::CodeGenVTables::createVTableInitializer
void createVTableInitializer(ConstantStructBuilder &builder, const VTableLayout &layout, llvm::Constant *rtti, bool vtableHasLocalLinkage)
Add vtable components for the given vtable layout to the given global initializer.
Definition: CGVTables.cpp:832
clang::CodeGen::CGCallee::forDirect
static CGCallee forDirect(llvm::Constant *functionPtr, const CGCalleeInfo &abstractInfo=CGCalleeInfo())
Definition: CGCall.h:135
clang::CodeGen::CodeGenModule::getTarget
const TargetInfo & getTarget() const
Definition: CodeGenModule.h:714
clang::QualType::getUnqualifiedType
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6504
clang::CodeGen::CodeGenFunction::EmitCXXGlobalVarDeclInit
void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr, bool PerformInit)
EmitCXXGlobalVarDeclInit - Create the initializer for a C++ variable with global storage.
Definition: CGDeclCXX.cpp:174
clang::CodeGen::CodeGenFunction::CurGD
GlobalDecl CurGD
CurGD - The GlobalDecl for the current function being compiled.
Definition: CodeGenFunction.h:350
clang::GVA_Internal
@ GVA_Internal
Definition: Linkage.h:74
clang::CodeGen::CodeGenFunction::EmitDeleteCall
void EmitDeleteCall(const FunctionDecl *DeleteFD, llvm::Value *Ptr, QualType DeleteTy, llvm::Value *NumElements=nullptr, CharUnits CookieSize=CharUnits())
Definition: CGExprCXX.cpp:1779
clang::ASTRecordLayout::getVBaseClassOffset
CharUnits getVBaseClassOffset(const CXXRecordDecl *VBase) const
getVBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:259
clang::CodeGen::CodeGenTypeCache::Int32Ty
llvm::IntegerType * Int32Ty
Definition: CodeGenTypeCache.h:37
clang::VarDecl::isNoDestroy
bool isNoDestroy(const ASTContext &) const
Is destruction of this variable entirely suppressed? If so, the variable need not have a usable destr...
Definition: Decl.cpp:2687
clang::CXXConstructorDecl::isDefaultConstructor
bool isDefaultConstructor() const
Whether this constructor is a default constructor (C++ [class.ctor]p5), which can be used to default-...
Definition: DeclCXX.cpp:2633
clang::ThisAdjustment::VirtualAdjustment::Microsoft
struct clang::ThisAdjustment::VirtualAdjustment::@178 Microsoft
clang::ASTContext::getExceptionObjectType
QualType getExceptionObjectType(QualType T) const
Definition: ASTContext.cpp:6256
clang::CodeGen::CodeGenTypes::GetFunctionType
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1595
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7226
clang::TargetInfo::getTriple
const llvm::Triple & getTriple() const
Returns the target triple of the primary target.
Definition: TargetInfo.h:1130
clang::ASTRecordLayout
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:38
clang::prec::And
@ And
Definition: OperatorPrecedence.h:35
clang::ThisAdjustment::VirtualAdjustment::VBPtrOffset
int32_t VBPtrOffset
The offset of the vbptr of the derived class (in bytes), relative to the ECX after vtordisp adjustmen...
Definition: Thunk.h:112
clang::CodeGen::CodeGenFunction::StartFunction
void StartFunction(GlobalDecl GD, QualType RetTy, llvm::Function *Fn, const CGFunctionInfo &FnInfo, const FunctionArgList &Args, SourceLocation Loc=SourceLocation(), SourceLocation StartLoc=SourceLocation())
Emit code for the start of a function.
Definition: CodeGenFunction.cpp:700
clang::ThisAdjustment::NonVirtual
int64_t NonVirtual
The non-virtual adjustment from the derived object to its nearest virtual base.
Definition: Thunk.h:94
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:255
clang::CodeGen::CodeGenTypes::arrangeCXXMethodType
const CGFunctionInfo & arrangeCXXMethodType(const CXXRecordDecl *RD, const FunctionProtoType *FTP, const CXXMethodDecl *MD)
Arrange the argument and result information for a call to an unknown C++ non-static member function o...
Definition: CGCall.cpp:255
clang::CodeGen::LValue
LValue - This represents an lvalue references.
Definition: CGValue.h:167
clang::inheritanceModelHasNVOffsetField
bool inheritanceModelHasNVOffsetField(bool IsMemberFunction, MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:371
clang::CodeGen::CodeGenFunction::EHStack
EHScopeStack EHStack
Definition: CodeGenFunction.h:585
clang::CodeGen::CodeGenModule::getMicrosoftVTableContext
MicrosoftVTableContext & getMicrosoftVTableContext()
Definition: CodeGenModule.h:734
clang::ReturnAdjustment::VirtualAdjustment::VBIndex
uint32_t VBIndex
Index of the virtual base in the vbtable.
Definition: Thunk.h:48
getInitThreadEpochPtr
static ConstantAddress getInitThreadEpochPtr(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2407
clang::serialized_diags::create
std::unique_ptr< DiagnosticConsumer > create(StringRef OutputFile, DiagnosticOptions *Diags, bool MergeChildRecords=false)
Returns a DiagnosticConsumer that serializes diagnostics to a bitcode file.
Definition: SerializedDiagnosticPrinter.cpp:302
clang::CastExpr::path_const_iterator
const typedef CXXBaseSpecifier *const * path_const_iterator
Definition: Expr.h:3541
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6672
clang::CXXRecordDecl::nullFieldOffsetIsZero
bool nullFieldOffsetIsZero() const
In the Microsoft C++ ABI, use zero for the field offset of a null data member pointer if we can guara...
Definition: MicrosoftCXXABI.cpp:225
VTableBuilder.h
clang::CodeGen::CodeGenFunction::createAtExitStub
llvm::Function * createAtExitStub(const VarDecl &VD, llvm::FunctionCallee Dtor, llvm::Constant *Addr)
Create a stub function, suitable for being passed to atexit, which passes the given address to the gi...
Definition: CGDeclCXX.cpp:230
clang::syntax::NodeRole::Size
@ Size
clang::ReturnAdjustment::isEmpty
bool isEmpty() const
Definition: Thunk.h:69
clang::ASTRecordLayout::getVBaseOffsetsMap
const VBaseOffsetsMapTy & getVBaseOffsetsMap() const
Definition: RecordLayout.h:334
clang::ThisAdjustment::Virtual
union clang::ThisAdjustment::VirtualAdjustment Virtual
clang::CXXRecordDecl::getNumVBases
unsigned getNumVBases() const
Retrieves the number of virtual base classes of this class.
Definition: DeclCXX.h:604
clang::CodeGen::Address::getPointer
llvm::Value * getPointer() const
Definition: Address.h:37
clang::CodeGen::CodeGenModule::ErrorUnsupported
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn't support the specified stmt yet.
Definition: CodeGenModule.cpp:964
clang::CodeGen::CodeGenFunction
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Definition: CodeGenFunction.h:235
clang::NamedDecl::getIdentifier
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:270
clang::ValueDecl
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:676
clang::ASTContext::IntTy
CanQualType IntTy
Definition: ASTContext.h:1084
clang::CodeGen::CodeGenTypeCache::PtrDiffTy
llvm::IntegerType * PtrDiffTy
Definition: CodeGenTypeCache.h:51
clang::CharUnits::isZero
bool isZero() const
isZero - Test whether the quantity equals zero.
Definition: CharUnits.h:116
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3885
clang::ASTContext::getFieldOffset
uint64_t getFieldOffset(const ValueDecl *FD) const
Get the offset of a FieldDecl or IndirectFieldDecl, in bits.
Definition: RecordLayoutBuilder.cpp:3389
clang::ASTContext::Idents
IdentifierTable & Idents
Definition: ASTContext.h:648
clang::CodeGen::CGCXXABI::AddedStructorArgCounts
Similar to AddedStructorArgs, but only notes the number of additional arguments.
Definition: CGCXXABI.h:319
clang::DeclContext::getParent
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1860
clang::ASTRecordLayout::VBaseOffsetsMapTy
llvm::DenseMap< const CXXRecordDecl *, VBaseInfo > VBaseOffsetsMapTy
Definition: RecordLayout.h:59
clang::Expr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:229
clang::CXXRecordDecl::hasPrivateFields
bool hasPrivateFields() const
Definition: DeclCXX.h:1143
Specifier
const NestedNameSpecifier * Specifier
Definition: USRLocFinder.cpp:173
clang::CodeGen::CodeGenModule
This class organizes the cross-function state that is used while generating LLVM code.
Definition: CodeGenModule.h:284
clang::CXXDeleteExpr
Represents a delete expression for memory deallocation and destructor calls, e.g.
Definition: ExprCXX.h:2398
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:738
clang::CodeGen::CodeGenModule::GetAddrOfRTTIDescriptor
llvm::Constant * GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH=false)
Get the address of the RTTI descriptor for the given type.
Definition: CodeGenModule.cpp:6229
llvm::ArrayRef
Definition: LLVM.h:34
Value
Value
Definition: UninitializedValues.cpp:102
clang::CastExpr::path_end
path_iterator path_end()
Definition: Expr.h:3545
clang::CodeGen::CGBuilderTy::CreateAlignedLoad
llvm::LoadInst * CreateAlignedLoad(llvm::Type *Ty, llvm::Value *Addr, CharUnits Align, const llvm::Twine &Name="")
Definition: CGBuilder.h:86
clang::CodeGen::CGCallee
All available information about a concrete callee.
Definition: CGCall.h:67
clang::CodeGen::FunctionArgList
FunctionArgList - Type for representing both the decl and type of parameters to a function.
Definition: CGCall.h:358
clang::CXXThrowExpr::getSubExpr
const Expr * getSubExpr() const
Definition: ExprCXX.h:1201
CodeGenTypes.h
clang::CodeGen::CGFunctionInfo::getReturnInfo
ABIArgInfo & getReturnInfo()
Definition: CGFunctionInfo.h:708
clang::inheritanceModelHasVBPtrOffsetField
bool inheritanceModelHasVBPtrOffsetField(MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:365
clang::MicrosoftVTableContext
Definition: VTableBuilder.h:544
clang::CodeGen::CodeGenFunction::ConvertType
llvm::Type * ConvertType(QualType T)
Definition: CodeGenFunction.cpp:211
clang::Dtor_Comdat
@ Dtor_Comdat
The COMDAT used for dtors.
Definition: ABI.h:37
clang::CodeGen::CodeGenTypes
This class organizes the cross-module state that is used while lowering AST types to LLVM types.
Definition: CodeGenTypes.h:59
clang::VPtrInfo::FullOffsetInMDC
CharUnits FullOffsetInMDC
Static offset from the top of the most derived class to this vfptr, including any virtual base offset...
Definition: VTableBuilder.h:487
clang::RecordDecl::canPassInRegisters
bool canPassInRegisters() const
Determine whether this class can be passed in registers.
Definition: Decl.h:4013
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:84
getThrowFn
static llvm::FunctionCallee getThrowFn(CodeGenModule &CGM)
Definition: ItaniumCXXABI.cpp:1326
clang::CodeGen::CGBuilderTy::CreateElementBitCast
Address CreateElementBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Cast the element type of the given address to a different type, preserving information like the align...
Definition: CGBuilder.h:166
clang::CodeGen::CodeGenFunction::EmitRuntimeCallOrInvoke
llvm::CallBase * EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee, ArrayRef< llvm::Value * > args, const Twine &name="")
Emits a call or invoke instruction to the given runtime function.
Definition: CGCall.cpp:4473
clang::MicrosoftVTableContext::getVBTableIndex
unsigned getVBTableIndex(const CXXRecordDecl *Derived, const CXXRecordDecl *VBase)
Returns the index of VBase in the vbtable of Derived.
Definition: VTableBuilder.cpp:3748
getRecordArgABI
static CGCXXABI::RecordArgABI getRecordArgABI(const RecordType *RT, CGCXXABI &CXXABI)
Definition: TargetInfo.cpp:156
clang::ThisAdjustment::isEmpty
bool isEmpty() const
Definition: Thunk.h:136
serializeClassHierarchy
static void serializeClassHierarchy(SmallVectorImpl< MSRTTIClass > &Classes, const CXXRecordDecl *RD)
Recursively serializes a class hierarchy in pre-order depth first order.
Definition: MicrosoftCXXABI.cpp:3608
clang::CXXRecordDecl::getDestructor
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1887
clang::CodeGen::CGBuilderTy::CreateConstByteGEP
Address CreateConstByteGEP(Address Addr, CharUnits Offset, const llvm::Twine &Name="")
Definition: CGBuilder.h:261
clang::MSInheritanceModel::Virtual
@ Virtual
clang::MemberPointerType
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2831
decomposeTypeForEH
static QualType decomposeTypeForEH(ASTContext &Context, QualType T, bool &IsConst, bool &IsVolatile, bool &IsUnaligned)
Definition: MicrosoftCXXABI.cpp:3821
clang::CodeGen::CGFunctionInfo
CGFunctionInfo - Class to encapsulate the information about a function definition.
Definition: CGFunctionInfo.h:546
clang::CXXRecordDecl::getMostRecentNonInjectedDecl
CXXRecordDecl * getMostRecentNonInjectedDecl()
Definition: DeclCXX.h:520
clang::ThisAdjustment::VirtualAdjustment::isEmpty
bool isEmpty() const
Definition: Thunk.h:124
CGCXXABI.h
clang::CodeGen::CGBuilderTy::CreateConstInBoundsGEP2_32
Address CreateConstInBoundsGEP2_32(Address Addr, unsigned Idx0, unsigned Idx1, const llvm::Twine &Name="")
Definition: CGBuilder.h:270
clang::inheritanceModelHasOnlyOneField
bool inheritanceModelHasOnlyOneField(bool IsMemberFunction, MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:381
clang::VPtrInfo::PathToIntroducingObject
BasePath PathToIntroducingObject
This holds the base classes path from the complete type to the first base with the given vfptr offset...
Definition: VTableBuilder.h:483
clang::VPtrInfo::MangledPath
BasePath MangledPath
The bases from the inheritance path that got used to mangle the vbtable name.
Definition: VTableBuilder.h:469
clang::CodeGen::CodeGenTypes::arrangeMSCtorClosure
const CGFunctionInfo & arrangeMSCtorClosure(const CXXConstructorDecl *CD, CXXCtorType CT)
Definition: CGCall.cpp:544
clang::CodeGen::CodeGenFunction::CGM
CodeGenModule & CGM
Definition: CodeGenFunction.h:266
clang::CodeGen::ABIArgInfo::setInReg
void setInReg(bool IR)
Definition: CGFunctionInfo.h:383
clang::VTableLayout
Definition: VTableBuilder.h:233
clang::interp::This
bool This(InterpState &S, CodePtr OpPC)
Definition: Interp.h:829
clang::ImplicitParamDecl::Create
static ImplicitParamDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, ImplicitParamKind ParamKind)
Create implicit parameter.
Definition: Decl.cpp:4880
clang::DiagnosticsEngine::getCustomDiagID
unsigned getCustomDiagID(Level L, const char(&FormatString)[N])
Return an ID for a diagnostic with the specified format string and level.
Definition: Diagnostic.h:866
clang::CodeGen::CodeGenFunction::CurFn
llvm::Function * CurFn
Definition: CodeGenFunction.h:330
clang::Builtin::ID
ID
Definition: Builtins.h:48
clang::MicrosoftVTableContext::getMethodVFTableLocation
MethodVFTableLocation getMethodVFTableLocation(GlobalDecl GD)
Definition: VTableBuilder.cpp:3779
clang::FieldDecl::getParent
const RecordDecl * getParent() const
Returns the parent of this field declaration, which is the struct in which this field is defined.
Definition: Decl.h:3027
clang
Definition: CalledOnceCheck.h:17
clang::TypeInfo::Align
unsigned Align
Definition: ASTContext.h:184
clang::CodeGen::RValue::get
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
clang::CodeGen::CodeGenFunction::EmitCallArgs
void EmitCallArgs(CallArgList &Args, PrototypeWrapper Prototype, llvm::iterator_range< CallExpr::const_arg_iterator > ArgRange, AbstractCallee AC=AbstractCallee(), unsigned ParamsToSkip=0, EvaluationOrder Order=EvaluationOrder::Default)
EmitCallArgs - Emit call arguments for a function.
Definition: CGCall.cpp:4084
clang::ASTContext::toCharUnitsFromBits
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Definition: ASTContext.cpp:2439
clang::CodeGen::ApplyDebugLocation::CreateArtificial
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:810
clang::ExternalLinkage
@ ExternalLinkage
External linkage, which indicates that the entity can be referred to from other translation units.
Definition: Linkage.h:59
clang::CodeGen::CatchTypeInfo
The MS C++ ABI needs a pointer to RTTI data plus some flags to describe the type of a catch handler,...
Definition: CGCleanup.h:37
clang::CodeGen::CodeGenModule::TryEmitBaseDestructorAsAlias
bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D)
Try to emit a base destructor as an alias to its primary base-class destructor.
Definition: CGCXX.cpp:34
clang::CXXCatchStmt
CXXCatchStmt - This represents a C++ catch block.
Definition: StmtCXX.h:28
clang::CodeGen::CGFunctionInfo::isInstanceMethod
bool isInstanceMethod() const
Definition: CGFunctionInfo.h:659
clang::ThisAdjustment::VirtualAdjustment::VBOffsetOffset
int32_t VBOffsetOffset
The offset (in bytes) of the vbase offset in the vbtable.
Definition: Thunk.h:115
clang::Type::isObjectType
bool isObjectType() const
Determine whether this type is an object type.
Definition: Type.h:1932
clang::CodeGen::CGCallee::forVirtual
static CGCallee forVirtual(const CallExpr *CE, GlobalDecl MD, Address Addr, llvm::FunctionType *FTy)
Definition: CGCall.h:145
clang::Expr::getType
QualType getType() const
Definition: Expr.h:141
clang::CXXBaseSpecifier
Represents a base class of a C++ class.
Definition: DeclCXX.h:147
clang::CXXRecordDecl::hasDefinition
bool hasDefinition() const
Definition: DeclCXX.h:542
clang::NamedDecl::getDeclName
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:313
clang::CodeGen::RValue::getScalarVal
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:59
clang::CodeGen::CodeGenModule::getDiags
DiagnosticsEngine & getDiags() const
Definition: CodeGenModule.h:710
clang::CodeGen::ApplyDebugLocation::CreateEmpty
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:827
clang::Dtor_Deleting
@ Dtor_Deleting
Deleting dtor.
Definition: ABI.h:34
clang::CodeGen::CodeGenFunction::CurFuncIsThunk
bool CurFuncIsThunk
In C++, whether we are code generating a thunk.
Definition: CodeGenFunction.h:505
clang::APValue::getMemberPointerPath
ArrayRef< const CXXRecordDecl * > getMemberPointerPath() const
Definition: APValue.cpp:990
clang::MSInheritanceModel
MSInheritanceModel
Assigned inheritance model for a class in the MS C++ ABI.
Definition: Specifiers.h:369
clang::CodeGen::ABIArgInfo::setSRetAfterThis
void setSRetAfterThis(bool AfterThis)
Definition: CGFunctionInfo.h:430
clang::CodeGen::CodeGenFunction::CurrentFuncletPad
llvm::Instruction * CurrentFuncletPad
Definition: CodeGenFunction.h:589
getInitThreadHeaderFn
static llvm::FunctionCallee getInitThreadHeaderFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2421
clang::CodeGen::CodeGenFunction::EmitAutoVarCleanups
void EmitAutoVarCleanups(const AutoVarEmission &emission)
Definition: CGDecl.cpp:2031
clang::CodeGen::CodeGenFunction::VPtr
Struct with all information about dynamic [sub]class needed to set vptr.
Definition: CodeGenFunction.h:2231
clang::ASTContext::getASTRecordLayout
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D,...
Definition: RecordLayoutBuilder.cpp:3246
clang::CodeGen::CodeGenVTables
Definition: CGVTables.h:32
clang::GlobalDecl::getDecl
const Decl * getDecl() const
Definition: GlobalDecl.h:102
clang::APValue::isMemberPointerToDerivedMember
bool isMemberPointerToDerivedMember() const
Definition: APValue.cpp:983
clang::ReturnAdjustment::NonVirtual
int64_t NonVirtual
The non-virtual adjustment from the derived object to its nearest virtual base.
Definition: Thunk.h:29
clang::CXXRecordDecl::hasNonTrivialDestructor
bool hasNonTrivialDestructor() const
Determine whether this class has a non-trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1321
clang::QualType::getTypePtr
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6424
clang::CodeGen::CGCXXABI
Implements C++ ABI-specific code generation functions.
Definition: CGCXXABI.h:44
clang::ASTContext::getPointerType
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
Definition: ASTContext.cpp:3249
clang::CXXRecordDecl::isPolymorphic
bool isPolymorphic() const
Whether this class is polymorphic (C++ [class.virtual]), which means that the class contains or inher...
Definition: DeclCXX.h:1159
Parent
NodeId Parent
Definition: ASTDiff.cpp:192
clang::CodeGen::CatchRetScope
Definition: CGCXXABI.h:645
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::CXXDeleteExpr::isGlobalDelete
bool isGlobalDelete() const
Definition: ExprCXX.h:2423
clang::index::SymbolKind::Function
@ Function
clang::APValue
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat],...
Definition: APValue.h:122
clang::VPtrInfo::ObjectWithVPtr
const CXXRecordDecl * ObjectWithVPtr
This is the most derived class that has this vptr at offset zero.
Definition: VTableBuilder.h:455
clang::MemberPointerType::getMostRecentCXXRecordDecl
CXXRecordDecl * getMostRecentCXXRecordDecl() const
Definition: Type.cpp:4390
clang::MethodVFTableLocation::VFPtrOffset
CharUnits VFPtrOffset
This is the offset of the vfptr from the start of the last vbase, or the complete type if there are n...
Definition: VTableBuilder.h:520
llvm::SmallVectorImpl
Definition: LLVM.h:39
CGVTables.h
clang::ValueDecl::getType
QualType getType() const
Definition: Decl.h:687
clang::CastKind
CastKind
CastKind - The kind of operation required for a conversion.
Definition: OperationKinds.h:20
clang::CodeGen::CodeGenFunction::CreateMemTemp
Address CreateMemTemp(QualType T, const Twine &Name="tmp", Address *Alloca=nullptr)
CreateMemTemp - Create a temporary memory object of the given type, with appropriate alignmen and cas...
Definition: CGExpr.cpp:135
llvm::SmallSetVector
Definition: ExternalSemaSource.h:23
clang::Expr
This represents one expression.
Definition: Expr.h:109
clang::MicrosoftMangleContext
Definition: Mangle.h:211
clang::CodeGen::CodeGenModule::getAddrOfCXXStructor
llvm::Constant * getAddrOfCXXStructor(GlobalDecl GD, const CGFunctionInfo *FnInfo=nullptr, llvm::FunctionType *FnType=nullptr, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Return the address of the constructor/destructor of the given type.
Definition: CodeGenModule.h:1022
clang::CodeGen::CreateMicrosoftCXXABI
CGCXXABI * CreateMicrosoftCXXABI(CodeGenModule &CGM)
Creates a Microsoft-family ABI.
Definition: MicrosoftCXXABI.cpp:3453
hasDefaultCXXMethodCC
static bool hasDefaultCXXMethodCC(ASTContext &Context, const CXXMethodDecl *MD)
Definition: MicrosoftCXXABI.cpp:1240
clang::ModuleLinkage
@ ModuleLinkage
Module linkage, which indicates that the entity can be referred to from other translation units withi...
Definition: Linkage.h:55
clang::ThisAdjustment
A this pointer adjustment.
Definition: Thunk.h:91
clang::QualType::isDestructedType
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after.
Definition: Type.h:1214
clang::CodeGen::CodeGenTypeCache::Int8Ty
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Definition: CodeGenTypeCache.h:37
clang::CastExpr
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3473
clang::CXXRecordDecl::hasProtectedFields
bool hasProtectedFields() const
Definition: DeclCXX.h:1147
clang::CodeGen::getCXXDestructorImplicitParam
llvm::Value * getCXXDestructorImplicitParam(CodeGenModule &CGM, llvm::BasicBlock *InsertBlock, llvm::BasicBlock::iterator InsertPoint, const CXXDestructorDecl *D, CXXDtorType Type, bool ForVirtualBase, bool Delegating)
Definition: CodeGenABITypes.cpp:119
clang::FunctionDecl::parameters
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2483
clang::Decl::getLocation
SourceLocation getLocation() const
Definition: DeclBase.h:430
clang::CodeGen::CallArgList
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:264
clang::CodeGen::CodeGenTypes::arrangeCXXConstructorCall
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:394
clang::CodeGen::CodeGenModule::setTLSMode
void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const
Set the TLS mode for the given LLVM GlobalValue for the thread-local variable declaration D.
Definition: CodeGenModule.cpp:1172
clang::ModuleInternalLinkage
@ ModuleInternalLinkage
Internal linkage according to the Modules TS, but can be referred to from other translation units ind...
Definition: Linkage.h:49
clang::CodeGen::CodeGenFunction::EmitBlock
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:529
StmtCXX.h
clang::FunctionDecl::isDefined
bool isDefined(const FunctionDecl *&Definition, bool CheckForPendingFriendDefinition=false) const
Returns true if the function has a definition that does not need to be instantiated.
Definition: Decl.cpp:3002
clang::CodeGen::CodeGenModule::getLLVMContext
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenModule.h:720
clang::CharUnits::isPositive
bool isPositive() const
isPositive - Test whether the quantity is greater than zero.
Definition: CharUnits.h:122
clang::CXXMemberCallExpr
Represents a call to a member function that may be written either with member call syntax (e....
Definition: ExprCXX.h:177
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
clang::MethodVFTableLocation
Definition: VTableBuilder.h:510
clang::Type::getLinkage
Linkage getLinkage() const
Determine the linkage of this type.
Definition: Type.cpp:3927
ConstantInitBuilder.h
clang::CXXMethodDecl::isVirtual
bool isVirtual() const
Definition: DeclCXX.h:1992
clang::CodeGen::CodeGenTypes::arrangeNullaryFunction
const CGFunctionInfo & arrangeNullaryFunction()
A nullary function is a freestanding function of type 'void ()'.
Definition: CGCall.cpp:699
clang::ASTContext::getCopyConstructorForExceptionObject
const CXXConstructorDecl * getCopyConstructorForExceptionObject(CXXRecordDecl *RD)
Definition: ASTContext.cpp:11338
clang::ASTContext::getMemberPointerType
QualType getMemberPointerType(QualType T, const Type *Cls) const
Return the uniqued reference to the type for a member pointer to the specified type in the specified ...
Definition: ASTContext.cpp:3442
clang::CodeGen::CodeGenFunction::CurFuncDecl
const Decl * CurFuncDecl
CurFuncDecl - Holds the Decl for the current outermost non-closure context.
Definition: CodeGenFunction.h:325
clang::DiagnosticsEngine::Report
DiagnosticBuilder Report(SourceLocation Loc, unsigned DiagID)
Issue the message to the client.
Definition: Diagnostic.h:1523
clang::ImplicitParamDecl::Other
@ Other
Other implicit parameter.
Definition: Decl.h:1625
clang::CodeGen::CGBuilderTy::CreateLoad
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:68
clang::CXXMethodDecl::getParent
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined.
Definition: DeclCXX.h:2063
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1948
detectAmbiguousBases
static void detectAmbiguousBases(SmallVectorImpl< MSRTTIClass > &Classes)
Find ambiguity among base classes.
Definition: MicrosoftCXXABI.cpp:3617
clang::CodeGen::CodeGenFunction::ReturnValue
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
Definition: CodeGenFunction.h:361
clang::Decl::getDeclContext
DeclContext * getDeclContext()
Definition: DeclBase.h:439