clang  15.0.0git
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 getContext().getLangOpts().isCompatibleWithMSVC(
406  (!isEmittedWithConstantInitializer(VD) || mayNeedDestruction(VD));
407  }
408  LValue EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF, const VarDecl *VD,
409  QualType LValType) override;
410 
411  void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
412  llvm::GlobalVariable *DeclPtr,
413  bool PerformInit) override;
414  void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
415  llvm::FunctionCallee Dtor,
416  llvm::Constant *Addr) override;
417 
418  // ==== Notes on array cookies =========
419  //
420  // MSVC seems to only use cookies when the class has a destructor; a
421  // two-argument usual array deallocation function isn't sufficient.
422  //
423  // For example, this code prints "100" and "1":
424  // struct A {
425  // char x;
426  // void *operator new[](size_t sz) {
427  // printf("%u\n", sz);
428  // return malloc(sz);
429  // }
430  // void operator delete[](void *p, size_t sz) {
431  // printf("%u\n", sz);
432  // free(p);
433  // }
434  // };
435  // int main() {
436  // A *p = new A[100];
437  // delete[] p;
438  // }
439  // Whereas it prints "104" and "104" if you give A a destructor.
440 
441  bool requiresArrayCookie(const CXXDeleteExpr *expr,
442  QualType elementType) override;
443  bool requiresArrayCookie(const CXXNewExpr *expr) override;
444  CharUnits getArrayCookieSizeImpl(QualType type) override;
445  Address InitializeArrayCookie(CodeGenFunction &CGF,
446  Address NewPtr,
447  llvm::Value *NumElements,
448  const CXXNewExpr *expr,
449  QualType ElementType) override;
450  llvm::Value *readArrayCookieImpl(CodeGenFunction &CGF,
451  Address allocPtr,
452  CharUnits cookieSize) override;
453 
454  friend struct MSRTTIBuilder;
455 
456  bool isImageRelative() const {
457  return CGM.getTarget().getPointerWidth(/*AddrSpace=*/0) == 64;
458  }
459 
460  // 5 routines for constructing the llvm types for MS RTTI structs.
461  llvm::StructType *getTypeDescriptorType(StringRef TypeInfoString) {
462  llvm::SmallString<32> TDTypeName("rtti.TypeDescriptor");
463  TDTypeName += llvm::utostr(TypeInfoString.size());
464  llvm::StructType *&TypeDescriptorType =
465  TypeDescriptorTypeMap[TypeInfoString.size()];
466  if (TypeDescriptorType)
467  return TypeDescriptorType;
468  llvm::Type *FieldTypes[] = {
469  CGM.Int8PtrPtrTy,
470  CGM.Int8PtrTy,
471  llvm::ArrayType::get(CGM.Int8Ty, TypeInfoString.size() + 1)};
472  TypeDescriptorType =
473  llvm::StructType::create(CGM.getLLVMContext(), FieldTypes, TDTypeName);
474  return TypeDescriptorType;
475  }
476 
477  llvm::Type *getImageRelativeType(llvm::Type *PtrType) {
478  if (!isImageRelative())
479  return PtrType;
480  return CGM.IntTy;
481  }
482 
483  llvm::StructType *getBaseClassDescriptorType() {
484  if (BaseClassDescriptorType)
485  return BaseClassDescriptorType;
486  llvm::Type *FieldTypes[] = {
487  getImageRelativeType(CGM.Int8PtrTy),
488  CGM.IntTy,
489  CGM.IntTy,
490  CGM.IntTy,
491  CGM.IntTy,
492  CGM.IntTy,
493  getImageRelativeType(getClassHierarchyDescriptorType()->getPointerTo()),
494  };
495  BaseClassDescriptorType = llvm::StructType::create(
496  CGM.getLLVMContext(), FieldTypes, "rtti.BaseClassDescriptor");
497  return BaseClassDescriptorType;
498  }
499 
500  llvm::StructType *getClassHierarchyDescriptorType() {
501  if (ClassHierarchyDescriptorType)
502  return ClassHierarchyDescriptorType;
503  // Forward-declare RTTIClassHierarchyDescriptor to break a cycle.
504  ClassHierarchyDescriptorType = llvm::StructType::create(
505  CGM.getLLVMContext(), "rtti.ClassHierarchyDescriptor");
506  llvm::Type *FieldTypes[] = {
507  CGM.IntTy,
508  CGM.IntTy,
509  CGM.IntTy,
510  getImageRelativeType(
511  getBaseClassDescriptorType()->getPointerTo()->getPointerTo()),
512  };
513  ClassHierarchyDescriptorType->setBody(FieldTypes);
514  return ClassHierarchyDescriptorType;
515  }
516 
517  llvm::StructType *getCompleteObjectLocatorType() {
518  if (CompleteObjectLocatorType)
519  return CompleteObjectLocatorType;
520  CompleteObjectLocatorType = llvm::StructType::create(
521  CGM.getLLVMContext(), "rtti.CompleteObjectLocator");
522  llvm::Type *FieldTypes[] = {
523  CGM.IntTy,
524  CGM.IntTy,
525  CGM.IntTy,
526  getImageRelativeType(CGM.Int8PtrTy),
527  getImageRelativeType(getClassHierarchyDescriptorType()->getPointerTo()),
528  getImageRelativeType(CompleteObjectLocatorType),
529  };
530  llvm::ArrayRef<llvm::Type *> FieldTypesRef(FieldTypes);
531  if (!isImageRelative())
532  FieldTypesRef = FieldTypesRef.drop_back();
533  CompleteObjectLocatorType->setBody(FieldTypesRef);
534  return CompleteObjectLocatorType;
535  }
536 
537  llvm::GlobalVariable *getImageBase() {
538  StringRef Name = "__ImageBase";
539  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(Name))
540  return GV;
541 
542  auto *GV = new llvm::GlobalVariable(CGM.getModule(), CGM.Int8Ty,
543  /*isConstant=*/true,
545  /*Initializer=*/nullptr, Name);
546  CGM.setDSOLocal(GV);
547  return GV;
548  }
549 
550  llvm::Constant *getImageRelativeConstant(llvm::Constant *PtrVal) {
551  if (!isImageRelative())
552  return PtrVal;
553 
554  if (PtrVal->isNullValue())
555  return llvm::Constant::getNullValue(CGM.IntTy);
556 
557  llvm::Constant *ImageBaseAsInt =
558  llvm::ConstantExpr::getPtrToInt(getImageBase(), CGM.IntPtrTy);
559  llvm::Constant *PtrValAsInt =
560  llvm::ConstantExpr::getPtrToInt(PtrVal, CGM.IntPtrTy);
561  llvm::Constant *Diff =
562  llvm::ConstantExpr::getSub(PtrValAsInt, ImageBaseAsInt,
563  /*HasNUW=*/true, /*HasNSW=*/true);
564  return llvm::ConstantExpr::getTrunc(Diff, CGM.IntTy);
565  }
566 
567 private:
568  MicrosoftMangleContext &getMangleContext() {
569  return cast<MicrosoftMangleContext>(CodeGen::CGCXXABI::getMangleContext());
570  }
571 
572  llvm::Constant *getZeroInt() {
573  return llvm::ConstantInt::get(CGM.IntTy, 0);
574  }
575 
576  llvm::Constant *getAllOnesInt() {
577  return llvm::Constant::getAllOnesValue(CGM.IntTy);
578  }
579 
580  CharUnits getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) override;
581 
582  void
583  GetNullMemberPointerFields(const MemberPointerType *MPT,
585 
586  /// Shared code for virtual base adjustment. Returns the offset from
587  /// the vbptr to the virtual base. Optionally returns the address of the
588  /// vbptr itself.
589  llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
590  Address Base,
591  llvm::Value *VBPtrOffset,
592  llvm::Value *VBTableOffset,
593  llvm::Value **VBPtr = nullptr);
594 
595  llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
596  Address Base,
597  int32_t VBPtrOffset,
598  int32_t VBTableOffset,
599  llvm::Value **VBPtr = nullptr) {
600  assert(VBTableOffset % 4 == 0 && "should be byte offset into table of i32s");
601  llvm::Value *VBPOffset = llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset),
602  *VBTOffset = llvm::ConstantInt::get(CGM.IntTy, VBTableOffset);
603  return GetVBaseOffsetFromVBPtr(CGF, Base, VBPOffset, VBTOffset, VBPtr);
604  }
605 
606  std::tuple<Address, llvm::Value *, const CXXRecordDecl *>
607  performBaseAdjustment(CodeGenFunction &CGF, Address Value,
608  QualType SrcRecordTy);
609 
610  /// Performs a full virtual base adjustment. Used to dereference
611  /// pointers to members of virtual bases.
612  llvm::Value *AdjustVirtualBase(CodeGenFunction &CGF, const Expr *E,
613  const CXXRecordDecl *RD, Address Base,
614  llvm::Value *VirtualBaseAdjustmentOffset,
615  llvm::Value *VBPtrOffset /* optional */);
616 
617  /// Emits a full member pointer with the fields common to data and
618  /// function member pointers.
619  llvm::Constant *EmitFullMemberPointer(llvm::Constant *FirstField,
620  bool IsMemberFunction,
621  const CXXRecordDecl *RD,
622  CharUnits NonVirtualBaseAdjustment,
623  unsigned VBTableIndex);
624 
625  bool MemberPointerConstantIsNull(const MemberPointerType *MPT,
626  llvm::Constant *MP);
627 
628  /// - Initialize all vbptrs of 'this' with RD as the complete type.
629  void EmitVBPtrStores(CodeGenFunction &CGF, const CXXRecordDecl *RD);
630 
631  /// Caching wrapper around VBTableBuilder::enumerateVBTables().
632  const VBTableGlobals &enumerateVBTables(const CXXRecordDecl *RD);
633 
634  /// Generate a thunk for calling a virtual member function MD.
635  llvm::Function *EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
636  const MethodVFTableLocation &ML);
637 
638  llvm::Constant *EmitMemberDataPointer(const CXXRecordDecl *RD,
639  CharUnits offset);
640 
641 public:
642  llvm::Type *ConvertMemberPointerType(const MemberPointerType *MPT) override;
643 
644  bool isZeroInitializable(const MemberPointerType *MPT) override;
645 
646  bool isMemberPointerConvertible(const MemberPointerType *MPT) const override {
647  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
648  return RD->hasAttr<MSInheritanceAttr>();
649  }
650 
651  llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT) override;
652 
653  llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT,
654  CharUnits offset) override;
655  llvm::Constant *EmitMemberFunctionPointer(const CXXMethodDecl *MD) override;
656  llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT) override;
657 
658  llvm::Value *EmitMemberPointerComparison(CodeGenFunction &CGF,
659  llvm::Value *L,
660  llvm::Value *R,
661  const MemberPointerType *MPT,
662  bool Inequality) override;
663 
664  llvm::Value *EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
665  llvm::Value *MemPtr,
666  const MemberPointerType *MPT) override;
667 
668  llvm::Value *
669  EmitMemberDataPointerAddress(CodeGenFunction &CGF, const Expr *E,
670  Address Base, llvm::Value *MemPtr,
671  const MemberPointerType *MPT) override;
672 
673  llvm::Value *EmitNonNullMemberPointerConversion(
674  const MemberPointerType *SrcTy, const MemberPointerType *DstTy,
676  CastExpr::path_const_iterator PathEnd, llvm::Value *Src,
677  CGBuilderTy &Builder);
678 
679  llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF,
680  const CastExpr *E,
681  llvm::Value *Src) override;
682 
683  llvm::Constant *EmitMemberPointerConversion(const CastExpr *E,
684  llvm::Constant *Src) override;
685 
686  llvm::Constant *EmitMemberPointerConversion(
687  const MemberPointerType *SrcTy, const MemberPointerType *DstTy,
689  CastExpr::path_const_iterator PathEnd, llvm::Constant *Src);
690 
691  CGCallee
692  EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF, const Expr *E,
693  Address This, llvm::Value *&ThisPtrForCall,
694  llvm::Value *MemPtr,
695  const MemberPointerType *MPT) override;
696 
697  void emitCXXStructor(GlobalDecl GD) override;
698 
699  llvm::StructType *getCatchableTypeType() {
700  if (CatchableTypeType)
701  return CatchableTypeType;
702  llvm::Type *FieldTypes[] = {
703  CGM.IntTy, // Flags
704  getImageRelativeType(CGM.Int8PtrTy), // TypeDescriptor
705  CGM.IntTy, // NonVirtualAdjustment
706  CGM.IntTy, // OffsetToVBPtr
707  CGM.IntTy, // VBTableIndex
708  CGM.IntTy, // Size
709  getImageRelativeType(CGM.Int8PtrTy) // CopyCtor
710  };
711  CatchableTypeType = llvm::StructType::create(
712  CGM.getLLVMContext(), FieldTypes, "eh.CatchableType");
713  return CatchableTypeType;
714  }
715 
716  llvm::StructType *getCatchableTypeArrayType(uint32_t NumEntries) {
717  llvm::StructType *&CatchableTypeArrayType =
718  CatchableTypeArrayTypeMap[NumEntries];
719  if (CatchableTypeArrayType)
720  return CatchableTypeArrayType;
721 
722  llvm::SmallString<23> CTATypeName("eh.CatchableTypeArray.");
723  CTATypeName += llvm::utostr(NumEntries);
724  llvm::Type *CTType =
725  getImageRelativeType(getCatchableTypeType()->getPointerTo());
726  llvm::Type *FieldTypes[] = {
727  CGM.IntTy, // NumEntries
728  llvm::ArrayType::get(CTType, NumEntries) // CatchableTypes
729  };
730  CatchableTypeArrayType =
731  llvm::StructType::create(CGM.getLLVMContext(), FieldTypes, CTATypeName);
732  return CatchableTypeArrayType;
733  }
734 
735  llvm::StructType *getThrowInfoType() {
736  if (ThrowInfoType)
737  return ThrowInfoType;
738  llvm::Type *FieldTypes[] = {
739  CGM.IntTy, // Flags
740  getImageRelativeType(CGM.Int8PtrTy), // CleanupFn
741  getImageRelativeType(CGM.Int8PtrTy), // ForwardCompat
742  getImageRelativeType(CGM.Int8PtrTy) // CatchableTypeArray
743  };
744  ThrowInfoType = llvm::StructType::create(CGM.getLLVMContext(), FieldTypes,
745  "eh.ThrowInfo");
746  return ThrowInfoType;
747  }
748 
749  llvm::FunctionCallee getThrowFn() {
750  // _CxxThrowException is passed an exception object and a ThrowInfo object
751  // which describes the exception.
752  llvm::Type *Args[] = {CGM.Int8PtrTy, getThrowInfoType()->getPointerTo()};
753  llvm::FunctionType *FTy =
754  llvm::FunctionType::get(CGM.VoidTy, Args, /*isVarArg=*/false);
755  llvm::FunctionCallee Throw =
756  CGM.CreateRuntimeFunction(FTy, "_CxxThrowException");
757  // _CxxThrowException is stdcall on 32-bit x86 platforms.
758  if (CGM.getTarget().getTriple().getArch() == llvm::Triple::x86) {
759  if (auto *Fn = dyn_cast<llvm::Function>(Throw.getCallee()))
760  Fn->setCallingConv(llvm::CallingConv::X86_StdCall);
761  }
762  return Throw;
763  }
764 
765  llvm::Function *getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
766  CXXCtorType CT);
767 
768  llvm::Constant *getCatchableType(QualType T,
769  uint32_t NVOffset = 0,
770  int32_t VBPtrOffset = -1,
771  uint32_t VBIndex = 0);
772 
773  llvm::GlobalVariable *getCatchableTypeArray(QualType T);
774 
775  llvm::GlobalVariable *getThrowInfo(QualType T) override;
776 
777  std::pair<llvm::Value *, const CXXRecordDecl *>
778  LoadVTablePtr(CodeGenFunction &CGF, Address This,
779  const CXXRecordDecl *RD) override;
780 
781  virtual bool
782  isPermittedToBeHomogeneousAggregate(const CXXRecordDecl *RD) const override;
783 
784 private:
785  typedef std::pair<const CXXRecordDecl *, CharUnits> VFTableIdTy;
786  typedef llvm::DenseMap<VFTableIdTy, llvm::GlobalVariable *> VTablesMapTy;
787  typedef llvm::DenseMap<VFTableIdTy, llvm::GlobalValue *> VFTablesMapTy;
788  /// All the vftables that have been referenced.
789  VFTablesMapTy VFTablesMap;
790  VTablesMapTy VTablesMap;
791 
792  /// This set holds the record decls we've deferred vtable emission for.
794 
795 
796  /// All the vbtables which have been referenced.
797  llvm::DenseMap<const CXXRecordDecl *, VBTableGlobals> VBTablesMap;
798 
799  /// Info on the global variable used to guard initialization of static locals.
800  /// The BitIndex field is only used for externally invisible declarations.
801  struct GuardInfo {
802  GuardInfo() : Guard(nullptr), BitIndex(0) {}
803  llvm::GlobalVariable *Guard;
804  unsigned BitIndex;
805  };
806 
807  /// Map from DeclContext to the current guard variable. We assume that the
808  /// AST is visited in source code order.
809  llvm::DenseMap<const DeclContext *, GuardInfo> GuardVariableMap;
810  llvm::DenseMap<const DeclContext *, GuardInfo> ThreadLocalGuardVariableMap;
811  llvm::DenseMap<const DeclContext *, unsigned> ThreadSafeGuardNumMap;
812 
813  llvm::DenseMap<size_t, llvm::StructType *> TypeDescriptorTypeMap;
814  llvm::StructType *BaseClassDescriptorType;
815  llvm::StructType *ClassHierarchyDescriptorType;
816  llvm::StructType *CompleteObjectLocatorType;
817 
818  llvm::DenseMap<QualType, llvm::GlobalVariable *> CatchableTypeArrays;
819 
820  llvm::StructType *CatchableTypeType;
821  llvm::DenseMap<uint32_t, llvm::StructType *> CatchableTypeArrayTypeMap;
822  llvm::StructType *ThrowInfoType;
823 };
824 
825 }
826 
829  // Use the default C calling convention rules for things that can be passed in
830  // registers, i.e. non-trivially copyable records or records marked with
831  // [[trivial_abi]].
832  if (RD->canPassInRegisters())
833  return RAA_Default;
834 
835  switch (CGM.getTarget().getTriple().getArch()) {
836  default:
837  // FIXME: Implement for other architectures.
838  return RAA_Indirect;
839 
840  case llvm::Triple::thumb:
841  // Pass things indirectly for now because it is simple.
842  // FIXME: This is incompatible with MSVC for arguments with a dtor and no
843  // copy ctor.
844  return RAA_Indirect;
845 
846  case llvm::Triple::x86: {
847  // If the argument has *required* alignment greater than four bytes, pass
848  // it indirectly. Prior to MSVC version 19.14, passing overaligned
849  // arguments was not supported and resulted in a compiler error. In 19.14
850  // and later versions, such arguments are now passed indirectly.
851  TypeInfo Info = getContext().getTypeInfo(RD->getTypeForDecl());
852  if (Info.isAlignRequired() && Info.Align > 4)
853  return RAA_Indirect;
854 
855  // If C++ prohibits us from making a copy, construct the arguments directly
856  // into argument memory.
857  return RAA_DirectInMemory;
858  }
859 
860  case llvm::Triple::x86_64:
861  case llvm::Triple::aarch64:
862  return RAA_Indirect;
863  }
864 
865  llvm_unreachable("invalid enum");
866 }
867 
868 void MicrosoftCXXABI::emitVirtualObjectDelete(CodeGenFunction &CGF,
869  const CXXDeleteExpr *DE,
870  Address Ptr,
871  QualType ElementType,
872  const CXXDestructorDecl *Dtor) {
873  // FIXME: Provide a source location here even though there's no
874  // CXXMemberCallExpr for dtor call.
875  bool UseGlobalDelete = DE->isGlobalDelete();
876  CXXDtorType DtorType = UseGlobalDelete ? Dtor_Complete : Dtor_Deleting;
877  llvm::Value *MDThis = EmitVirtualDestructorCall(CGF, Dtor, DtorType, Ptr, DE);
878  if (UseGlobalDelete)
879  CGF.EmitDeleteCall(DE->getOperatorDelete(), MDThis, ElementType);
880 }
881 
882 void MicrosoftCXXABI::emitRethrow(CodeGenFunction &CGF, bool isNoReturn) {
883  llvm::Value *Args[] = {
884  llvm::ConstantPointerNull::get(CGM.Int8PtrTy),
885  llvm::ConstantPointerNull::get(getThrowInfoType()->getPointerTo())};
886  llvm::FunctionCallee Fn = getThrowFn();
887  if (isNoReturn)
888  CGF.EmitNoreturnRuntimeCallOrInvoke(Fn, Args);
889  else
890  CGF.EmitRuntimeCallOrInvoke(Fn, Args);
891 }
892 
893 void MicrosoftCXXABI::emitBeginCatch(CodeGenFunction &CGF,
894  const CXXCatchStmt *S) {
895  // In the MS ABI, the runtime handles the copy, and the catch handler is
896  // responsible for destruction.
897  VarDecl *CatchParam = S->getExceptionDecl();
898  llvm::BasicBlock *CatchPadBB = CGF.Builder.GetInsertBlock();
899  llvm::CatchPadInst *CPI =
900  cast<llvm::CatchPadInst>(CatchPadBB->getFirstNonPHI());
901  CGF.CurrentFuncletPad = CPI;
902 
903  // If this is a catch-all or the catch parameter is unnamed, we don't need to
904  // emit an alloca to the object.
905  if (!CatchParam || !CatchParam->getDeclName()) {
906  CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI);
907  return;
908  }
909 
911  CPI->setArgOperand(2, var.getObjectAddress(CGF).getPointer());
912  CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI);
914 }
915 
916 /// We need to perform a generic polymorphic operation (like a typeid
917 /// or a cast), which requires an object with a vfptr. Adjust the
918 /// address to point to an object with a vfptr.
919 std::tuple<Address, llvm::Value *, const CXXRecordDecl *>
920 MicrosoftCXXABI::performBaseAdjustment(CodeGenFunction &CGF, Address Value,
921  QualType SrcRecordTy) {
923  const CXXRecordDecl *SrcDecl = SrcRecordTy->getAsCXXRecordDecl();
924  const ASTContext &Context = getContext();
925 
926  // If the class itself has a vfptr, great. This check implicitly
927  // covers non-virtual base subobjects: a class with its own virtual
928  // functions would be a candidate to be a primary base.
929  if (Context.getASTRecordLayout(SrcDecl).hasExtendableVFPtr())
930  return std::make_tuple(Value, llvm::ConstantInt::get(CGF.Int32Ty, 0),
931  SrcDecl);
932 
933  // Okay, one of the vbases must have a vfptr, or else this isn't
934  // actually a polymorphic class.
935  const CXXRecordDecl *PolymorphicBase = nullptr;
936  for (auto &Base : SrcDecl->vbases()) {
937  const CXXRecordDecl *BaseDecl = Base.getType()->getAsCXXRecordDecl();
938  if (Context.getASTRecordLayout(BaseDecl).hasExtendableVFPtr()) {
939  PolymorphicBase = BaseDecl;
940  break;
941  }
942  }
943  assert(PolymorphicBase && "polymorphic class has no apparent vfptr?");
944 
945  llvm::Value *Offset =
946  GetVirtualBaseClassOffset(CGF, Value, SrcDecl, PolymorphicBase);
947  llvm::Value *Ptr = CGF.Builder.CreateInBoundsGEP(
948  Value.getElementType(), Value.getPointer(), Offset);
949  CharUnits VBaseAlign =
950  CGF.CGM.getVBaseAlignment(Value.getAlignment(), SrcDecl, PolymorphicBase);
951  return std::make_tuple(Address(Ptr, CGF.Int8Ty, VBaseAlign), Offset,
952  PolymorphicBase);
953 }
954 
955 bool MicrosoftCXXABI::shouldTypeidBeNullChecked(bool IsDeref,
956  QualType SrcRecordTy) {
957  const CXXRecordDecl *SrcDecl = SrcRecordTy->getAsCXXRecordDecl();
958  return IsDeref &&
959  !getContext().getASTRecordLayout(SrcDecl).hasExtendableVFPtr();
960 }
961 
962 static llvm::CallBase *emitRTtypeidCall(CodeGenFunction &CGF,
963  llvm::Value *Argument) {
964  llvm::Type *ArgTypes[] = {CGF.Int8PtrTy};
965  llvm::FunctionType *FTy =
966  llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false);
967  llvm::Value *Args[] = {Argument};
968  llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(FTy, "__RTtypeid");
969  return CGF.EmitRuntimeCallOrInvoke(Fn, Args);
970 }
971 
972 void MicrosoftCXXABI::EmitBadTypeidCall(CodeGenFunction &CGF) {
973  llvm::CallBase *Call =
974  emitRTtypeidCall(CGF, llvm::Constant::getNullValue(CGM.VoidPtrTy));
975  Call->setDoesNotReturn();
976  CGF.Builder.CreateUnreachable();
977 }
978 
979 llvm::Value *MicrosoftCXXABI::EmitTypeid(CodeGenFunction &CGF,
980  QualType SrcRecordTy,
981  Address ThisPtr,
982  llvm::Type *StdTypeInfoPtrTy) {
983  std::tie(ThisPtr, std::ignore, std::ignore) =
984  performBaseAdjustment(CGF, ThisPtr, SrcRecordTy);
985  llvm::CallBase *Typeid = emitRTtypeidCall(CGF, ThisPtr.getPointer());
986  return CGF.Builder.CreateBitCast(Typeid, StdTypeInfoPtrTy);
987 }
988 
989 bool MicrosoftCXXABI::shouldDynamicCastCallBeNullChecked(bool SrcIsPtr,
990  QualType SrcRecordTy) {
991  const CXXRecordDecl *SrcDecl = SrcRecordTy->getAsCXXRecordDecl();
992  return SrcIsPtr &&
993  !getContext().getASTRecordLayout(SrcDecl).hasExtendableVFPtr();
994 }
995 
996 llvm::Value *MicrosoftCXXABI::EmitDynamicCastCall(
997  CodeGenFunction &CGF, Address This, QualType SrcRecordTy,
998  QualType DestTy, QualType DestRecordTy, llvm::BasicBlock *CastEnd) {
999  llvm::Type *DestLTy = CGF.ConvertType(DestTy);
1000 
1001  llvm::Value *SrcRTTI =
1002  CGF.CGM.GetAddrOfRTTIDescriptor(SrcRecordTy.getUnqualifiedType());
1003  llvm::Value *DestRTTI =
1004  CGF.CGM.GetAddrOfRTTIDescriptor(DestRecordTy.getUnqualifiedType());
1005 
1006  llvm::Value *Offset;
1007  std::tie(This, Offset, std::ignore) =
1008  performBaseAdjustment(CGF, This, SrcRecordTy);
1009  llvm::Value *ThisPtr = This.getPointer();
1010  Offset = CGF.Builder.CreateTrunc(Offset, CGF.Int32Ty);
1011 
1012  // PVOID __RTDynamicCast(
1013  // PVOID inptr,
1014  // LONG VfDelta,
1015  // PVOID SrcType,
1016  // PVOID TargetType,
1017  // BOOL isReference)
1018  llvm::Type *ArgTypes[] = {CGF.Int8PtrTy, CGF.Int32Ty, CGF.Int8PtrTy,
1019  CGF.Int8PtrTy, CGF.Int32Ty};
1020  llvm::FunctionCallee Function = CGF.CGM.CreateRuntimeFunction(
1021  llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false),
1022  "__RTDynamicCast");
1023  llvm::Value *Args[] = {
1024  ThisPtr, Offset, SrcRTTI, DestRTTI,
1025  llvm::ConstantInt::get(CGF.Int32Ty, DestTy->isReferenceType())};
1026  ThisPtr = CGF.EmitRuntimeCallOrInvoke(Function, Args);
1027  return CGF.Builder.CreateBitCast(ThisPtr, DestLTy);
1028 }
1029 
1030 llvm::Value *
1031 MicrosoftCXXABI::EmitDynamicCastToVoid(CodeGenFunction &CGF, Address Value,
1032  QualType SrcRecordTy,
1033  QualType DestTy) {
1034  std::tie(Value, std::ignore, std::ignore) =
1035  performBaseAdjustment(CGF, Value, SrcRecordTy);
1036 
1037  // PVOID __RTCastToVoid(
1038  // PVOID inptr)
1039  llvm::Type *ArgTypes[] = {CGF.Int8PtrTy};
1040  llvm::FunctionCallee Function = CGF.CGM.CreateRuntimeFunction(
1041  llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false),
1042  "__RTCastToVoid");
1043  llvm::Value *Args[] = {Value.getPointer()};
1044  return CGF.EmitRuntimeCall(Function, Args);
1045 }
1046 
1047 bool MicrosoftCXXABI::EmitBadCastCall(CodeGenFunction &CGF) {
1048  return false;
1049 }
1050 
1051 llvm::Value *MicrosoftCXXABI::GetVirtualBaseClassOffset(
1052  CodeGenFunction &CGF, Address This, const CXXRecordDecl *ClassDecl,
1053  const CXXRecordDecl *BaseClassDecl) {
1054  const ASTContext &Context = getContext();
1055  int64_t VBPtrChars =
1056  Context.getASTRecordLayout(ClassDecl).getVBPtrOffset().getQuantity();
1057  llvm::Value *VBPtrOffset = llvm::ConstantInt::get(CGM.PtrDiffTy, VBPtrChars);
1058  CharUnits IntSize = Context.getTypeSizeInChars(Context.IntTy);
1059  CharUnits VBTableChars =
1060  IntSize *
1061  CGM.getMicrosoftVTableContext().getVBTableIndex(ClassDecl, BaseClassDecl);
1062  llvm::Value *VBTableOffset =
1063  llvm::ConstantInt::get(CGM.IntTy, VBTableChars.getQuantity());
1064 
1065  llvm::Value *VBPtrToNewBase =
1066  GetVBaseOffsetFromVBPtr(CGF, This, VBPtrOffset, VBTableOffset);
1067  VBPtrToNewBase =
1068  CGF.Builder.CreateSExtOrBitCast(VBPtrToNewBase, CGM.PtrDiffTy);
1069  return CGF.Builder.CreateNSWAdd(VBPtrOffset, VBPtrToNewBase);
1070 }
1071 
1072 bool MicrosoftCXXABI::HasThisReturn(GlobalDecl GD) const {
1073  return isa<CXXConstructorDecl>(GD.getDecl());
1074 }
1075 
1076 static bool isDeletingDtor(GlobalDecl GD) {
1077  return isa<CXXDestructorDecl>(GD.getDecl()) &&
1078  GD.getDtorType() == Dtor_Deleting;
1079 }
1080 
1081 bool MicrosoftCXXABI::hasMostDerivedReturn(GlobalDecl GD) const {
1082  return isDeletingDtor(GD);
1083 }
1084 
1085 static bool isTrivialForAArch64MSVC(const CXXRecordDecl *RD) {
1086  // For AArch64, we use the C++14 definition of an aggregate, so we also
1087  // check for:
1088  // No private or protected non static data members.
1089  // No base classes
1090  // No virtual functions
1091  // Additionally, we need to ensure that there is a trivial copy assignment
1092  // operator, a trivial destructor and no user-provided constructors.
1093  if (RD->hasProtectedFields() || RD->hasPrivateFields())
1094  return false;
1095  if (RD->getNumBases() > 0)
1096  return false;
1097  if (RD->isPolymorphic())
1098  return false;
1099  if (RD->hasNonTrivialCopyAssignment())
1100  return false;
1101  for (const CXXConstructorDecl *Ctor : RD->ctors())
1102  if (Ctor->isUserProvided())
1103  return false;
1104  if (RD->hasNonTrivialDestructor())
1105  return false;
1106  return true;
1107 }
1108 
1110  const CXXRecordDecl *RD = FI.getReturnType()->getAsCXXRecordDecl();
1111  if (!RD)
1112  return false;
1113 
1114  // Normally, the C++ concept of "is trivially copyable" is used to determine
1115  // if a struct can be returned directly. However, as MSVC and the language
1116  // have evolved, the definition of "trivially copyable" has changed, while the
1117  // ABI must remain stable. AArch64 uses the C++14 concept of an "aggregate",
1118  // while other ISAs use the older concept of "plain old data".
1119  bool isTrivialForABI = RD->isPOD();
1120  bool isAArch64 = CGM.getTarget().getTriple().isAArch64();
1121  if (isAArch64)
1122  isTrivialForABI = RD->canPassInRegisters() && isTrivialForAArch64MSVC(RD);
1123 
1124  // MSVC always returns structs indirectly from C++ instance methods.
1125  bool isIndirectReturn = !isTrivialForABI || FI.isInstanceMethod();
1126 
1127  if (isIndirectReturn) {
1128  CharUnits Align = CGM.getContext().getTypeAlignInChars(FI.getReturnType());
1129  FI.getReturnInfo() = ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
1130 
1131  // MSVC always passes `this` before the `sret` parameter.
1133 
1134  // On AArch64, use the `inreg` attribute if the object is considered to not
1135  // be trivially copyable, or if this is an instance method struct return.
1136  FI.getReturnInfo().setInReg(isAArch64);
1137 
1138  return true;
1139  }
1140 
1141  // Otherwise, use the C ABI rules.
1142  return false;
1143 }
1144 
1145 llvm::BasicBlock *
1146 MicrosoftCXXABI::EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
1147  const CXXRecordDecl *RD) {
1148  llvm::Value *IsMostDerivedClass = getStructorImplicitParamValue(CGF);
1149  assert(IsMostDerivedClass &&
1150  "ctor for a class with virtual bases must have an implicit parameter");
1151  llvm::Value *IsCompleteObject =
1152  CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
1153 
1154  llvm::BasicBlock *CallVbaseCtorsBB = CGF.createBasicBlock("ctor.init_vbases");
1155  llvm::BasicBlock *SkipVbaseCtorsBB = CGF.createBasicBlock("ctor.skip_vbases");
1156  CGF.Builder.CreateCondBr(IsCompleteObject,
1157  CallVbaseCtorsBB, SkipVbaseCtorsBB);
1158 
1159  CGF.EmitBlock(CallVbaseCtorsBB);
1160 
1161  // Fill in the vbtable pointers here.
1162  EmitVBPtrStores(CGF, RD);
1163 
1164  // CGF will put the base ctor calls in this basic block for us later.
1165 
1166  return SkipVbaseCtorsBB;
1167 }
1168 
1169 llvm::BasicBlock *
1170 MicrosoftCXXABI::EmitDtorCompleteObjectHandler(CodeGenFunction &CGF) {
1171  llvm::Value *IsMostDerivedClass = getStructorImplicitParamValue(CGF);
1172  assert(IsMostDerivedClass &&
1173  "ctor for a class with virtual bases must have an implicit parameter");
1174  llvm::Value *IsCompleteObject =
1175  CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
1176 
1177  llvm::BasicBlock *CallVbaseDtorsBB = CGF.createBasicBlock("Dtor.dtor_vbases");
1178  llvm::BasicBlock *SkipVbaseDtorsBB = CGF.createBasicBlock("Dtor.skip_vbases");
1179  CGF.Builder.CreateCondBr(IsCompleteObject,
1180  CallVbaseDtorsBB, SkipVbaseDtorsBB);
1181 
1182  CGF.EmitBlock(CallVbaseDtorsBB);
1183  // CGF will put the base dtor calls in this basic block for us later.
1184 
1185  return SkipVbaseDtorsBB;
1186 }
1187 
1188 void MicrosoftCXXABI::initializeHiddenVirtualInheritanceMembers(
1189  CodeGenFunction &CGF, const CXXRecordDecl *RD) {
1190  // In most cases, an override for a vbase virtual method can adjust
1191  // the "this" parameter by applying a constant offset.
1192  // However, this is not enough while a constructor or a destructor of some
1193  // class X is being executed if all the following conditions are met:
1194  // - X has virtual bases, (1)
1195  // - X overrides a virtual method M of a vbase Y, (2)
1196  // - X itself is a vbase of the most derived class.
1197  //
1198  // If (1) and (2) are true, the vtorDisp for vbase Y is a hidden member of X
1199  // which holds the extra amount of "this" adjustment we must do when we use
1200  // the X vftables (i.e. during X ctor or dtor).
1201  // Outside the ctors and dtors, the values of vtorDisps are zero.
1202 
1203  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
1204  typedef ASTRecordLayout::VBaseOffsetsMapTy VBOffsets;
1205  const VBOffsets &VBaseMap = Layout.getVBaseOffsetsMap();
1206  CGBuilderTy &Builder = CGF.Builder;
1207 
1208  unsigned AS = getThisAddress(CGF).getAddressSpace();
1209  llvm::Value *Int8This = nullptr; // Initialize lazily.
1210 
1211  for (const CXXBaseSpecifier &S : RD->vbases()) {
1212  const CXXRecordDecl *VBase = S.getType()->getAsCXXRecordDecl();
1213  auto I = VBaseMap.find(VBase);
1214  assert(I != VBaseMap.end());
1215  if (!I->second.hasVtorDisp())
1216  continue;
1217 
1218  llvm::Value *VBaseOffset =
1219  GetVirtualBaseClassOffset(CGF, getThisAddress(CGF), RD, VBase);
1220  uint64_t ConstantVBaseOffset = I->second.VBaseOffset.getQuantity();
1221 
1222  // vtorDisp_for_vbase = vbptr[vbase_idx] - offsetof(RD, vbase).
1223  llvm::Value *VtorDispValue = Builder.CreateSub(
1224  VBaseOffset, llvm::ConstantInt::get(CGM.PtrDiffTy, ConstantVBaseOffset),
1225  "vtordisp.value");
1226  VtorDispValue = Builder.CreateTruncOrBitCast(VtorDispValue, CGF.Int32Ty);
1227 
1228  if (!Int8This)
1229  Int8This = Builder.CreateBitCast(getThisValue(CGF),
1230  CGF.Int8Ty->getPointerTo(AS));
1231  llvm::Value *VtorDispPtr =
1232  Builder.CreateInBoundsGEP(CGF.Int8Ty, Int8This, VBaseOffset);
1233  // vtorDisp is always the 32-bits before the vbase in the class layout.
1234  VtorDispPtr = Builder.CreateConstGEP1_32(CGF.Int8Ty, VtorDispPtr, -4);
1235  VtorDispPtr = Builder.CreateBitCast(
1236  VtorDispPtr, CGF.Int32Ty->getPointerTo(AS), "vtordisp.ptr");
1237 
1238  Builder.CreateAlignedStore(VtorDispValue, VtorDispPtr,
1240  }
1241 }
1242 
1243 static bool hasDefaultCXXMethodCC(ASTContext &Context,
1244  const CXXMethodDecl *MD) {
1245  CallingConv ExpectedCallingConv = Context.getDefaultCallingConvention(
1246  /*IsVariadic=*/false, /*IsCXXMethod=*/true);
1247  CallingConv ActualCallingConv =
1248  MD->getType()->castAs<FunctionProtoType>()->getCallConv();
1249  return ExpectedCallingConv == ActualCallingConv;
1250 }
1251 
1252 void MicrosoftCXXABI::EmitCXXConstructors(const CXXConstructorDecl *D) {
1253  // There's only one constructor type in this ABI.
1254  CGM.EmitGlobal(GlobalDecl(D, Ctor_Complete));
1255 
1256  // Exported default constructors either have a simple call-site where they use
1257  // the typical calling convention and have a single 'this' pointer for an
1258  // argument -or- they get a wrapper function which appropriately thunks to the
1259  // real default constructor. This thunk is the default constructor closure.
1260  if (D->hasAttr<DLLExportAttr>() && D->isDefaultConstructor() &&
1261  D->isDefined()) {
1262  if (!hasDefaultCXXMethodCC(getContext(), D) || D->getNumParams() != 0) {
1263  llvm::Function *Fn = getAddrOfCXXCtorClosure(D, Ctor_DefaultClosure);
1264  Fn->setLinkage(llvm::GlobalValue::WeakODRLinkage);
1265  CGM.setGVProperties(Fn, D);
1266  }
1267  }
1268 }
1269 
1270 void MicrosoftCXXABI::EmitVBPtrStores(CodeGenFunction &CGF,
1271  const CXXRecordDecl *RD) {
1272  Address This = getThisAddress(CGF);
1273  This = CGF.Builder.CreateElementBitCast(This, CGM.Int8Ty, "this.int8");
1274  const ASTContext &Context = getContext();
1275  const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
1276 
1277  const VBTableGlobals &VBGlobals = enumerateVBTables(RD);
1278  for (unsigned I = 0, E = VBGlobals.VBTables->size(); I != E; ++I) {
1279  const std::unique_ptr<VPtrInfo> &VBT = (*VBGlobals.VBTables)[I];
1280  llvm::GlobalVariable *GV = VBGlobals.Globals[I];
1281  const ASTRecordLayout &SubobjectLayout =
1282  Context.getASTRecordLayout(VBT->IntroducingObject);
1283  CharUnits Offs = VBT->NonVirtualOffset;
1284  Offs += SubobjectLayout.getVBPtrOffset();
1285  if (VBT->getVBaseWithVPtr())
1286  Offs += Layout.getVBaseClassOffset(VBT->getVBaseWithVPtr());
1287  Address VBPtr = CGF.Builder.CreateConstInBoundsByteGEP(This, Offs);
1288  llvm::Value *GVPtr =
1289  CGF.Builder.CreateConstInBoundsGEP2_32(GV->getValueType(), GV, 0, 0);
1290  VBPtr = CGF.Builder.CreateElementBitCast(VBPtr, GVPtr->getType(),
1291  "vbptr." + VBT->ObjectWithVPtr->getName());
1292  CGF.Builder.CreateStore(GVPtr, VBPtr);
1293  }
1294 }
1295 
1297 MicrosoftCXXABI::buildStructorSignature(GlobalDecl GD,
1298  SmallVectorImpl<CanQualType> &ArgTys) {
1299  AddedStructorArgCounts Added;
1300  // TODO: 'for base' flag
1301  if (isa<CXXDestructorDecl>(GD.getDecl()) &&
1302  GD.getDtorType() == Dtor_Deleting) {
1303  // The scalar deleting destructor takes an implicit int parameter.
1304  ArgTys.push_back(getContext().IntTy);
1305  ++Added.Suffix;
1306  }
1307  auto *CD = dyn_cast<CXXConstructorDecl>(GD.getDecl());
1308  if (!CD)
1309  return Added;
1310 
1311  // All parameters are already in place except is_most_derived, which goes
1312  // after 'this' if it's variadic and last if it's not.
1313 
1314  const CXXRecordDecl *Class = CD->getParent();
1315  const FunctionProtoType *FPT = CD->getType()->castAs<FunctionProtoType>();
1316  if (Class->getNumVBases()) {
1317  if (FPT->isVariadic()) {
1318  ArgTys.insert(ArgTys.begin() + 1, getContext().IntTy);
1319  ++Added.Prefix;
1320  } else {
1321  ArgTys.push_back(getContext().IntTy);
1322  ++Added.Suffix;
1323  }
1324  }
1325 
1326  return Added;
1327 }
1328 
1329 void MicrosoftCXXABI::setCXXDestructorDLLStorage(llvm::GlobalValue *GV,
1330  const CXXDestructorDecl *Dtor,
1331  CXXDtorType DT) const {
1332  // Deleting destructor variants are never imported or exported. Give them the
1333  // default storage class.
1334  if (DT == Dtor_Deleting) {
1335  GV->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1336  } else {
1337  const NamedDecl *ND = Dtor;
1338  CGM.setDLLImportDLLExport(GV, ND);
1339  }
1340 }
1341 
1342 llvm::GlobalValue::LinkageTypes MicrosoftCXXABI::getCXXDestructorLinkage(
1343  GVALinkage Linkage, const CXXDestructorDecl *Dtor, CXXDtorType DT) const {
1344  // Internal things are always internal, regardless of attributes. After this,
1345  // we know the thunk is externally visible.
1346  if (Linkage == GVA_Internal)
1348 
1349  switch (DT) {
1350  case Dtor_Base:
1351  // The base destructor most closely tracks the user-declared constructor, so
1352  // we delegate back to the normal declarator case.
1353  return CGM.getLLVMLinkageForDeclarator(Dtor, Linkage,
1354  /*IsConstantVariable=*/false);
1355  case Dtor_Complete:
1356  // The complete destructor is like an inline function, but it may be
1357  // imported and therefore must be exported as well. This requires changing
1358  // the linkage if a DLL attribute is present.
1359  if (Dtor->hasAttr<DLLExportAttr>())
1360  return llvm::GlobalValue::WeakODRLinkage;
1361  if (Dtor->hasAttr<DLLImportAttr>())
1362  return llvm::GlobalValue::AvailableExternallyLinkage;
1363  return llvm::GlobalValue::LinkOnceODRLinkage;
1364  case Dtor_Deleting:
1365  // Deleting destructors are like inline functions. They have vague linkage
1366  // and are emitted everywhere they are used. They are internal if the class
1367  // is internal.
1368  return llvm::GlobalValue::LinkOnceODRLinkage;
1369  case Dtor_Comdat:
1370  llvm_unreachable("MS C++ ABI does not support comdat dtors");
1371  }
1372  llvm_unreachable("invalid dtor type");
1373 }
1374 
1375 void MicrosoftCXXABI::EmitCXXDestructors(const CXXDestructorDecl *D) {
1376  // The TU defining a dtor is only guaranteed to emit a base destructor. All
1377  // other destructor variants are delegating thunks.
1378  CGM.EmitGlobal(GlobalDecl(D, Dtor_Base));
1379 
1380  // If the class is dllexported, emit the complete (vbase) destructor wherever
1381  // the base dtor is emitted.
1382  // FIXME: To match MSVC, this should only be done when the class is exported
1383  // with -fdllexport-inlines enabled.
1384  if (D->getParent()->getNumVBases() > 0 && D->hasAttr<DLLExportAttr>())
1385  CGM.EmitGlobal(GlobalDecl(D, Dtor_Complete));
1386 }
1387 
1388 CharUnits
1389 MicrosoftCXXABI::getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) {
1390  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
1391 
1392  if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
1393  // Complete destructors take a pointer to the complete object as a
1394  // parameter, thus don't need this adjustment.
1395  if (GD.getDtorType() == Dtor_Complete)
1396  return CharUnits();
1397 
1398  // There's no Dtor_Base in vftable but it shares the this adjustment with
1399  // the deleting one, so look it up instead.
1400  GD = GlobalDecl(DD, Dtor_Deleting);
1401  }
1402 
1404  CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
1405  CharUnits Adjustment = ML.VFPtrOffset;
1406 
1407  // Normal virtual instance methods need to adjust from the vfptr that first
1408  // defined the virtual method to the virtual base subobject, but destructors
1409  // do not. The vector deleting destructor thunk applies this adjustment for
1410  // us if necessary.
1411  if (isa<CXXDestructorDecl>(MD))
1412  Adjustment = CharUnits::Zero();
1413 
1414  if (ML.VBase) {
1415  const ASTRecordLayout &DerivedLayout =
1416  getContext().getASTRecordLayout(MD->getParent());
1417  Adjustment += DerivedLayout.getVBaseClassOffset(ML.VBase);
1418  }
1419 
1420  return Adjustment;
1421 }
1422 
1423 Address MicrosoftCXXABI::adjustThisArgumentForVirtualFunctionCall(
1425  bool VirtualCall) {
1426  if (!VirtualCall) {
1427  // If the call of a virtual function is not virtual, we just have to
1428  // compensate for the adjustment the virtual function does in its prologue.
1429  CharUnits Adjustment = getVirtualFunctionPrologueThisAdjustment(GD);
1430  if (Adjustment.isZero())
1431  return This;
1432 
1434  assert(Adjustment.isPositive());
1435  return CGF.Builder.CreateConstByteGEP(This, Adjustment);
1436  }
1437 
1438  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
1439 
1440  GlobalDecl LookupGD = GD;
1441  if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
1442  // Complete dtors take a pointer to the complete object,
1443  // thus don't need adjustment.
1444  if (GD.getDtorType() == Dtor_Complete)
1445  return This;
1446 
1447  // There's only Dtor_Deleting in vftable but it shares the this adjustment
1448  // with the base one, so look up the deleting one instead.
1449  LookupGD = GlobalDecl(DD, Dtor_Deleting);
1450  }
1452  CGM.getMicrosoftVTableContext().getMethodVFTableLocation(LookupGD);
1453 
1454  CharUnits StaticOffset = ML.VFPtrOffset;
1455 
1456  // Base destructors expect 'this' to point to the beginning of the base
1457  // subobject, not the first vfptr that happens to contain the virtual dtor.
1458  // However, we still need to apply the virtual base adjustment.
1459  if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base)
1460  StaticOffset = CharUnits::Zero();
1461 
1462  Address Result = This;
1463  if (ML.VBase) {
1464  Result = CGF.Builder.CreateElementBitCast(Result, CGF.Int8Ty);
1465 
1466  const CXXRecordDecl *Derived = MD->getParent();
1467  const CXXRecordDecl *VBase = ML.VBase;
1468  llvm::Value *VBaseOffset =
1469  GetVirtualBaseClassOffset(CGF, Result, Derived, VBase);
1470  llvm::Value *VBasePtr = CGF.Builder.CreateInBoundsGEP(
1471  Result.getElementType(), Result.getPointer(), VBaseOffset);
1472  CharUnits VBaseAlign =
1473  CGF.CGM.getVBaseAlignment(Result.getAlignment(), Derived, VBase);
1474  Result = Address(VBasePtr, CGF.Int8Ty, VBaseAlign);
1475  }
1476  if (!StaticOffset.isZero()) {
1477  assert(StaticOffset.isPositive());
1478  Result = CGF.Builder.CreateElementBitCast(Result, CGF.Int8Ty);
1479  if (ML.VBase) {
1480  // Non-virtual adjustment might result in a pointer outside the allocated
1481  // object, e.g. if the final overrider class is laid out after the virtual
1482  // base that declares a method in the most derived class.
1483  // FIXME: Update the code that emits this adjustment in thunks prologues.
1484  Result = CGF.Builder.CreateConstByteGEP(Result, StaticOffset);
1485  } else {
1486  Result = CGF.Builder.CreateConstInBoundsByteGEP(Result, StaticOffset);
1487  }
1488  }
1489  return Result;
1490 }
1491 
1492 void MicrosoftCXXABI::addImplicitStructorParams(CodeGenFunction &CGF,
1493  QualType &ResTy,
1494  FunctionArgList &Params) {
1495  ASTContext &Context = getContext();
1496  const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
1497  assert(isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD));
1498  if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
1499  auto *IsMostDerived = ImplicitParamDecl::Create(
1500  Context, /*DC=*/nullptr, CGF.CurGD.getDecl()->getLocation(),
1501  &Context.Idents.get("is_most_derived"), Context.IntTy,
1503  // The 'most_derived' parameter goes second if the ctor is variadic and last
1504  // if it's not. Dtors can't be variadic.
1505  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
1506  if (FPT->isVariadic())
1507  Params.insert(Params.begin() + 1, IsMostDerived);
1508  else
1509  Params.push_back(IsMostDerived);
1510  getStructorImplicitParamDecl(CGF) = IsMostDerived;
1511  } else if (isDeletingDtor(CGF.CurGD)) {
1512  auto *ShouldDelete = ImplicitParamDecl::Create(
1513  Context, /*DC=*/nullptr, CGF.CurGD.getDecl()->getLocation(),
1514  &Context.Idents.get("should_call_delete"), Context.IntTy,
1516  Params.push_back(ShouldDelete);
1517  getStructorImplicitParamDecl(CGF) = ShouldDelete;
1518  }
1519 }
1520 
1521 void MicrosoftCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
1522  // Naked functions have no prolog.
1523  if (CGF.CurFuncDecl && CGF.CurFuncDecl->hasAttr<NakedAttr>())
1524  return;
1525 
1526  // Overridden virtual methods of non-primary bases need to adjust the incoming
1527  // 'this' pointer in the prologue. In this hierarchy, C::b will subtract
1528  // sizeof(void*) to adjust from B* to C*:
1529  // struct A { virtual void a(); };
1530  // struct B { virtual void b(); };
1531  // struct C : A, B { virtual void b(); };
1532  //
1533  // Leave the value stored in the 'this' alloca unadjusted, so that the
1534  // debugger sees the unadjusted value. Microsoft debuggers require this, and
1535  // will apply the ThisAdjustment in the method type information.
1536  // FIXME: Do something better for DWARF debuggers, which won't expect this,
1537  // without making our codegen depend on debug info settings.
1538  llvm::Value *This = loadIncomingCXXThis(CGF);
1539  const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
1540  if (!CGF.CurFuncIsThunk && MD->isVirtual()) {
1541  CharUnits Adjustment = getVirtualFunctionPrologueThisAdjustment(CGF.CurGD);
1542  if (!Adjustment.isZero()) {
1543  unsigned AS = cast<llvm::PointerType>(This->getType())->getAddressSpace();
1544  llvm::Type *charPtrTy = CGF.Int8Ty->getPointerTo(AS),
1545  *thisTy = This->getType();
1546  This = CGF.Builder.CreateBitCast(This, charPtrTy);
1547  assert(Adjustment.isPositive());
1548  This = CGF.Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, This,
1549  -Adjustment.getQuantity());
1550  This = CGF.Builder.CreateBitCast(This, thisTy, "this.adjusted");
1551  }
1552  }
1553  setCXXABIThisValue(CGF, This);
1554 
1555  // If this is a function that the ABI specifies returns 'this', initialize
1556  // the return slot to 'this' at the start of the function.
1557  //
1558  // Unlike the setting of return types, this is done within the ABI
1559  // implementation instead of by clients of CGCXXABI because:
1560  // 1) getThisValue is currently protected
1561  // 2) in theory, an ABI could implement 'this' returns some other way;
1562  // HasThisReturn only specifies a contract, not the implementation
1563  if (HasThisReturn(CGF.CurGD))
1564  CGF.Builder.CreateStore(getThisValue(CGF), CGF.ReturnValue);
1565  else if (hasMostDerivedReturn(CGF.CurGD))
1566  CGF.Builder.CreateStore(CGF.EmitCastToVoidPtr(getThisValue(CGF)),
1567  CGF.ReturnValue);
1568 
1569  if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
1570  assert(getStructorImplicitParamDecl(CGF) &&
1571  "no implicit parameter for a constructor with virtual bases?");
1572  getStructorImplicitParamValue(CGF)
1573  = CGF.Builder.CreateLoad(
1574  CGF.GetAddrOfLocalVar(getStructorImplicitParamDecl(CGF)),
1575  "is_most_derived");
1576  }
1577 
1578  if (isDeletingDtor(CGF.CurGD)) {
1579  assert(getStructorImplicitParamDecl(CGF) &&
1580  "no implicit parameter for a deleting destructor?");
1581  getStructorImplicitParamValue(CGF)
1582  = CGF.Builder.CreateLoad(
1583  CGF.GetAddrOfLocalVar(getStructorImplicitParamDecl(CGF)),
1584  "should_call_delete");
1585  }
1586 }
1587 
1588 CGCXXABI::AddedStructorArgs MicrosoftCXXABI::getImplicitConstructorArgs(
1590  bool ForVirtualBase, bool Delegating) {
1591  assert(Type == Ctor_Complete || Type == Ctor_Base);
1592 
1593  // Check if we need a 'most_derived' parameter.
1594  if (!D->getParent()->getNumVBases())
1595  return AddedStructorArgs{};
1596 
1597  // Add the 'most_derived' argument second if we are variadic or last if not.
1598  const FunctionProtoType *FPT = D->getType()->castAs<FunctionProtoType>();
1599  llvm::Value *MostDerivedArg;
1600  if (Delegating) {
1601  MostDerivedArg = getStructorImplicitParamValue(CGF);
1602  } else {
1603  MostDerivedArg = llvm::ConstantInt::get(CGM.Int32Ty, Type == Ctor_Complete);
1604  }
1605  if (FPT->isVariadic()) {
1606  return AddedStructorArgs::prefix({{MostDerivedArg, getContext().IntTy}});
1607  }
1608  return AddedStructorArgs::suffix({{MostDerivedArg, getContext().IntTy}});
1609 }
1610 
1613  bool ForVirtualBase, bool Delegating) {
1614  return nullptr;
1615 }
1616 
1617 void MicrosoftCXXABI::EmitDestructorCall(CodeGenFunction &CGF,
1618  const CXXDestructorDecl *DD,
1619  CXXDtorType Type, bool ForVirtualBase,
1620  bool Delegating, Address This,
1621  QualType ThisTy) {
1622  // Use the base destructor variant in place of the complete destructor variant
1623  // if the class has no virtual bases. This effectively implements some of the
1624  // -mconstructor-aliases optimization, but as part of the MS C++ ABI.
1625  if (Type == Dtor_Complete && DD->getParent()->getNumVBases() == 0)
1626  Type = Dtor_Base;
1627 
1628  GlobalDecl GD(DD, Type);
1629  CGCallee Callee = CGCallee::forDirect(CGM.getAddrOfCXXStructor(GD), GD);
1630 
1631  if (DD->isVirtual()) {
1632  assert(Type != CXXDtorType::Dtor_Deleting &&
1633  "The deleting destructor should only be called via a virtual call");
1634  This = adjustThisArgumentForVirtualFunctionCall(CGF, GlobalDecl(DD, Type),
1635  This, false);
1636  }
1637 
1638  llvm::BasicBlock *BaseDtorEndBB = nullptr;
1639  if (ForVirtualBase && isa<CXXConstructorDecl>(CGF.CurCodeDecl)) {
1640  BaseDtorEndBB = EmitDtorCompleteObjectHandler(CGF);
1641  }
1642 
1643  llvm::Value *Implicit =
1644  getCXXDestructorImplicitParam(CGF, DD, Type, ForVirtualBase,
1645  Delegating); // = nullptr
1646  CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(), ThisTy,
1647  /*ImplicitParam=*/Implicit,
1648  /*ImplicitParamTy=*/QualType(), nullptr);
1649  if (BaseDtorEndBB) {
1650  // Complete object handler should continue to be the remaining
1651  CGF.Builder.CreateBr(BaseDtorEndBB);
1652  CGF.EmitBlock(BaseDtorEndBB);
1653  }
1654 }
1655 
1656 void MicrosoftCXXABI::emitVTableTypeMetadata(const VPtrInfo &Info,
1657  const CXXRecordDecl *RD,
1658  llvm::GlobalVariable *VTable) {
1659  if (!CGM.getCodeGenOpts().LTOUnit)
1660  return;
1661 
1662  // TODO: Should VirtualFunctionElimination also be supported here?
1663  // See similar handling in CodeGenModule::EmitVTableTypeMetadata.
1664  if (CGM.getCodeGenOpts().WholeProgramVTables) {
1666  llvm::GlobalObject::VCallVisibility TypeVis =
1667  CGM.GetVCallVisibilityLevel(RD, Visited);
1668  if (TypeVis != llvm::GlobalObject::VCallVisibilityPublic)
1669  VTable->setVCallVisibilityMetadata(TypeVis);
1670  }
1671 
1672  // The location of the first virtual function pointer in the virtual table,
1673  // aka the "address point" on Itanium. This is at offset 0 if RTTI is
1674  // disabled, or sizeof(void*) if RTTI is enabled.
1675  CharUnits AddressPoint =
1676  getContext().getLangOpts().RTTIData
1677  ? getContext().toCharUnitsFromBits(
1678  getContext().getTargetInfo().getPointerWidth(0))
1679  : CharUnits::Zero();
1680 
1681  if (Info.PathToIntroducingObject.empty()) {
1682  CGM.AddVTableTypeMetadata(VTable, AddressPoint, RD);
1683  return;
1684  }
1685 
1686  // Add a bitset entry for the least derived base belonging to this vftable.
1687  CGM.AddVTableTypeMetadata(VTable, AddressPoint,
1688  Info.PathToIntroducingObject.back());
1689 
1690  // Add a bitset entry for each derived class that is laid out at the same
1691  // offset as the least derived base.
1692  for (unsigned I = Info.PathToIntroducingObject.size() - 1; I != 0; --I) {
1693  const CXXRecordDecl *DerivedRD = Info.PathToIntroducingObject[I - 1];
1694  const CXXRecordDecl *BaseRD = Info.PathToIntroducingObject[I];
1695 
1696  const ASTRecordLayout &Layout =
1697  getContext().getASTRecordLayout(DerivedRD);
1698  CharUnits Offset;
1699  auto VBI = Layout.getVBaseOffsetsMap().find(BaseRD);
1700  if (VBI == Layout.getVBaseOffsetsMap().end())
1701  Offset = Layout.getBaseClassOffset(BaseRD);
1702  else
1703  Offset = VBI->second.VBaseOffset;
1704  if (!Offset.isZero())
1705  return;
1706  CGM.AddVTableTypeMetadata(VTable, AddressPoint, DerivedRD);
1707  }
1708 
1709  // Finally do the same for the most derived class.
1710  if (Info.FullOffsetInMDC.isZero())
1711  CGM.AddVTableTypeMetadata(VTable, AddressPoint, RD);
1712 }
1713 
1714 void MicrosoftCXXABI::emitVTableDefinitions(CodeGenVTables &CGVT,
1715  const CXXRecordDecl *RD) {
1716  MicrosoftVTableContext &VFTContext = CGM.getMicrosoftVTableContext();
1717  const VPtrInfoVector &VFPtrs = VFTContext.getVFPtrOffsets(RD);
1718 
1719  for (const std::unique_ptr<VPtrInfo>& Info : VFPtrs) {
1720  llvm::GlobalVariable *VTable = getAddrOfVTable(RD, Info->FullOffsetInMDC);
1721  if (VTable->hasInitializer())
1722  continue;
1723 
1724  const VTableLayout &VTLayout =
1725  VFTContext.getVFTableLayout(RD, Info->FullOffsetInMDC);
1726 
1727  llvm::Constant *RTTI = nullptr;
1728  if (any_of(VTLayout.vtable_components(),
1729  [](const VTableComponent &VTC) { return VTC.isRTTIKind(); }))
1730  RTTI = getMSCompleteObjectLocator(RD, *Info);
1731 
1732  ConstantInitBuilder builder(CGM);
1733  auto components = builder.beginStruct();
1734  CGVT.createVTableInitializer(components, VTLayout, RTTI,
1735  VTable->hasLocalLinkage());
1736  components.finishAndSetAsInitializer(VTable);
1737 
1738  emitVTableTypeMetadata(*Info, RD, VTable);
1739  }
1740 }
1741 
1742 bool MicrosoftCXXABI::isVirtualOffsetNeededForVTableField(
1744  return Vptr.NearestVBase != nullptr;
1745 }
1746 
1747 llvm::Value *MicrosoftCXXABI::getVTableAddressPointInStructor(
1748  CodeGenFunction &CGF, const CXXRecordDecl *VTableClass, BaseSubobject Base,
1749  const CXXRecordDecl *NearestVBase) {
1750  llvm::Constant *VTableAddressPoint = getVTableAddressPoint(Base, VTableClass);
1751  if (!VTableAddressPoint) {
1752  assert(Base.getBase()->getNumVBases() &&
1753  !getContext().getASTRecordLayout(Base.getBase()).hasOwnVFPtr());
1754  }
1755  return VTableAddressPoint;
1756 }
1757 
1759  const CXXRecordDecl *RD, const VPtrInfo &VFPtr,
1760  SmallString<256> &Name) {
1761  llvm::raw_svector_ostream Out(Name);
1762  MangleContext.mangleCXXVFTable(RD, VFPtr.MangledPath, Out);
1763 }
1764 
1765 llvm::Constant *
1766 MicrosoftCXXABI::getVTableAddressPoint(BaseSubobject Base,
1767  const CXXRecordDecl *VTableClass) {
1768  (void)getAddrOfVTable(VTableClass, Base.getBaseOffset());
1769  VFTableIdTy ID(VTableClass, Base.getBaseOffset());
1770  return VFTablesMap[ID];
1771 }
1772 
1773 llvm::Constant *MicrosoftCXXABI::getVTableAddressPointForConstExpr(
1774  BaseSubobject Base, const CXXRecordDecl *VTableClass) {
1775  llvm::Constant *VFTable = getVTableAddressPoint(Base, VTableClass);
1776  assert(VFTable && "Couldn't find a vftable for the given base?");
1777  return VFTable;
1778 }
1779 
1780 llvm::GlobalVariable *MicrosoftCXXABI::getAddrOfVTable(const CXXRecordDecl *RD,
1781  CharUnits VPtrOffset) {
1782  // getAddrOfVTable may return 0 if asked to get an address of a vtable which
1783  // shouldn't be used in the given record type. We want to cache this result in
1784  // VFTablesMap, thus a simple zero check is not sufficient.
1785 
1786  VFTableIdTy ID(RD, VPtrOffset);
1787  VTablesMapTy::iterator I;
1788  bool Inserted;
1789  std::tie(I, Inserted) = VTablesMap.insert(std::make_pair(ID, nullptr));
1790  if (!Inserted)
1791  return I->second;
1792 
1793  llvm::GlobalVariable *&VTable = I->second;
1794 
1795  MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
1796  const VPtrInfoVector &VFPtrs = VTContext.getVFPtrOffsets(RD);
1797 
1798  if (DeferredVFTables.insert(RD).second) {
1799  // We haven't processed this record type before.
1800  // Queue up this vtable for possible deferred emission.
1801  CGM.addDeferredVTable(RD);
1802 
1803 #ifndef NDEBUG
1804  // Create all the vftables at once in order to make sure each vftable has
1805  // a unique mangled name.
1806  llvm::StringSet<> ObservedMangledNames;
1807  for (size_t J = 0, F = VFPtrs.size(); J != F; ++J) {
1808  SmallString<256> Name;
1809  mangleVFTableName(getMangleContext(), RD, *VFPtrs[J], Name);
1810  if (!ObservedMangledNames.insert(Name.str()).second)
1811  llvm_unreachable("Already saw this mangling before?");
1812  }
1813 #endif
1814  }
1815 
1816  const std::unique_ptr<VPtrInfo> *VFPtrI =
1817  llvm::find_if(VFPtrs, [&](const std::unique_ptr<VPtrInfo> &VPI) {
1818  return VPI->FullOffsetInMDC == VPtrOffset;
1819  });
1820  if (VFPtrI == VFPtrs.end()) {
1821  VFTablesMap[ID] = nullptr;
1822  return nullptr;
1823  }
1824  const std::unique_ptr<VPtrInfo> &VFPtr = *VFPtrI;
1825 
1826  SmallString<256> VFTableName;
1827  mangleVFTableName(getMangleContext(), RD, *VFPtr, VFTableName);
1828 
1829  // Classes marked __declspec(dllimport) need vftables generated on the
1830  // import-side in order to support features like constexpr. No other
1831  // translation unit relies on the emission of the local vftable, translation
1832  // units are expected to generate them as needed.
1833  //
1834  // Because of this unique behavior, we maintain this logic here instead of
1835  // getVTableLinkage.
1836  llvm::GlobalValue::LinkageTypes VFTableLinkage =
1837  RD->hasAttr<DLLImportAttr>() ? llvm::GlobalValue::LinkOnceODRLinkage
1838  : CGM.getVTableLinkage(RD);
1839  bool VFTableComesFromAnotherTU =
1840  llvm::GlobalValue::isAvailableExternallyLinkage(VFTableLinkage) ||
1841  llvm::GlobalValue::isExternalLinkage(VFTableLinkage);
1842  bool VTableAliasIsRequred =
1843  !VFTableComesFromAnotherTU && getContext().getLangOpts().RTTIData;
1844 
1845  if (llvm::GlobalValue *VFTable =
1846  CGM.getModule().getNamedGlobal(VFTableName)) {
1847  VFTablesMap[ID] = VFTable;
1848  VTable = VTableAliasIsRequred
1849  ? cast<llvm::GlobalVariable>(
1850  cast<llvm::GlobalAlias>(VFTable)->getAliaseeObject())
1851  : cast<llvm::GlobalVariable>(VFTable);
1852  return VTable;
1853  }
1854 
1855  const VTableLayout &VTLayout =
1856  VTContext.getVFTableLayout(RD, VFPtr->FullOffsetInMDC);
1857  llvm::GlobalValue::LinkageTypes VTableLinkage =
1858  VTableAliasIsRequred ? llvm::GlobalValue::PrivateLinkage : VFTableLinkage;
1859 
1860  StringRef VTableName = VTableAliasIsRequred ? StringRef() : VFTableName.str();
1861 
1862  llvm::Type *VTableType = CGM.getVTables().getVTableType(VTLayout);
1863 
1864  // Create a backing variable for the contents of VTable. The VTable may
1865  // or may not include space for a pointer to RTTI data.
1866  llvm::GlobalValue *VFTable;
1867  VTable = new llvm::GlobalVariable(CGM.getModule(), VTableType,
1868  /*isConstant=*/true, VTableLinkage,
1869  /*Initializer=*/nullptr, VTableName);
1870  VTable->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1871 
1872  llvm::Comdat *C = nullptr;
1873  if (!VFTableComesFromAnotherTU &&
1874  (llvm::GlobalValue::isWeakForLinker(VFTableLinkage) ||
1875  (llvm::GlobalValue::isLocalLinkage(VFTableLinkage) &&
1876  VTableAliasIsRequred)))
1877  C = CGM.getModule().getOrInsertComdat(VFTableName.str());
1878 
1879  // Only insert a pointer into the VFTable for RTTI data if we are not
1880  // importing it. We never reference the RTTI data directly so there is no
1881  // need to make room for it.
1882  if (VTableAliasIsRequred) {
1883  llvm::Value *GEPIndices[] = {llvm::ConstantInt::get(CGM.Int32Ty, 0),
1884  llvm::ConstantInt::get(CGM.Int32Ty, 0),
1885  llvm::ConstantInt::get(CGM.Int32Ty, 1)};
1886  // Create a GEP which points just after the first entry in the VFTable,
1887  // this should be the location of the first virtual method.
1888  llvm::Constant *VTableGEP = llvm::ConstantExpr::getInBoundsGetElementPtr(
1889  VTable->getValueType(), VTable, GEPIndices);
1890  if (llvm::GlobalValue::isWeakForLinker(VFTableLinkage)) {
1891  VFTableLinkage = llvm::GlobalValue::ExternalLinkage;
1892  if (C)
1893  C->setSelectionKind(llvm::Comdat::Largest);
1894  }
1895  VFTable = llvm::GlobalAlias::create(CGM.Int8PtrTy,
1896  /*AddressSpace=*/0, VFTableLinkage,
1897  VFTableName.str(), VTableGEP,
1898  &CGM.getModule());
1899  VFTable->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1900  } else {
1901  // We don't need a GlobalAlias to be a symbol for the VTable if we won't
1902  // be referencing any RTTI data.
1903  // The GlobalVariable will end up being an appropriate definition of the
1904  // VFTable.
1905  VFTable = VTable;
1906  }
1907  if (C)
1908  VTable->setComdat(C);
1909 
1910  if (RD->hasAttr<DLLExportAttr>())
1911  VFTable->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1912 
1913  VFTablesMap[ID] = VFTable;
1914  return VTable;
1915 }
1916 
1917 CGCallee MicrosoftCXXABI::getVirtualFunctionPointer(CodeGenFunction &CGF,
1918  GlobalDecl GD,
1919  Address This,
1920  llvm::Type *Ty,
1921  SourceLocation Loc) {
1922  CGBuilderTy &Builder = CGF.Builder;
1923 
1924  Ty = Ty->getPointerTo();
1925  Address VPtr =
1926  adjustThisArgumentForVirtualFunctionCall(CGF, GD, This, true);
1927 
1928  auto *MethodDecl = cast<CXXMethodDecl>(GD.getDecl());
1929  llvm::Value *VTable = CGF.GetVTablePtr(VPtr, Ty->getPointerTo(),
1930  MethodDecl->getParent());
1931 
1932  MicrosoftVTableContext &VFTContext = CGM.getMicrosoftVTableContext();
1933  MethodVFTableLocation ML = VFTContext.getMethodVFTableLocation(GD);
1934 
1935  // Compute the identity of the most derived class whose virtual table is
1936  // located at the MethodVFTableLocation ML.
1937  auto getObjectWithVPtr = [&] {
1938  return llvm::find_if(VFTContext.getVFPtrOffsets(
1939  ML.VBase ? ML.VBase : MethodDecl->getParent()),
1940  [&](const std::unique_ptr<VPtrInfo> &Info) {
1941  return Info->FullOffsetInMDC == ML.VFPtrOffset;
1942  })
1943  ->get()
1944  ->ObjectWithVPtr;
1945  };
1946 
1947  llvm::Value *VFunc;
1948  if (CGF.ShouldEmitVTableTypeCheckedLoad(MethodDecl->getParent())) {
1949  VFunc = CGF.EmitVTableTypeCheckedLoad(
1950  getObjectWithVPtr(), VTable, Ty,
1951  ML.Index * CGM.getContext().getTargetInfo().getPointerWidth(0) / 8);
1952  } else {
1953  if (CGM.getCodeGenOpts().PrepareForLTO)
1954  CGF.EmitTypeMetadataCodeForVCall(getObjectWithVPtr(), VTable, Loc);
1955 
1956  llvm::Value *VFuncPtr =
1957  Builder.CreateConstInBoundsGEP1_64(Ty, VTable, ML.Index, "vfn");
1958  VFunc = Builder.CreateAlignedLoad(Ty, VFuncPtr, CGF.getPointerAlign());
1959  }
1960 
1961  CGCallee Callee(GD, VFunc);
1962  return Callee;
1963 }
1964 
1965 llvm::Value *MicrosoftCXXABI::EmitVirtualDestructorCall(
1966  CodeGenFunction &CGF, const CXXDestructorDecl *Dtor, CXXDtorType DtorType,
1967  Address This, DeleteOrMemberCallExpr E) {
1968  auto *CE = E.dyn_cast<const CXXMemberCallExpr *>();
1969  auto *D = E.dyn_cast<const CXXDeleteExpr *>();
1970  assert((CE != nullptr) ^ (D != nullptr));
1971  assert(CE == nullptr || CE->arg_begin() == CE->arg_end());
1972  assert(DtorType == Dtor_Deleting || DtorType == Dtor_Complete);
1973 
1974  // We have only one destructor in the vftable but can get both behaviors
1975  // by passing an implicit int parameter.
1976  GlobalDecl GD(Dtor, Dtor_Deleting);
1977  const CGFunctionInfo *FInfo =
1978  &CGM.getTypes().arrangeCXXStructorDeclaration(GD);
1979  llvm::FunctionType *Ty = CGF.CGM.getTypes().GetFunctionType(*FInfo);
1980  CGCallee Callee = CGCallee::forVirtual(CE, GD, This, Ty);
1981 
1982  ASTContext &Context = getContext();
1983  llvm::Value *ImplicitParam = llvm::ConstantInt::get(
1984  llvm::IntegerType::getInt32Ty(CGF.getLLVMContext()),
1985  DtorType == Dtor_Deleting);
1986 
1987  QualType ThisTy;
1988  if (CE) {
1989  ThisTy = CE->getObjectType();
1990  } else {
1991  ThisTy = D->getDestroyedType();
1992  }
1993 
1994  This = adjustThisArgumentForVirtualFunctionCall(CGF, GD, This, true);
1995  RValue RV = CGF.EmitCXXDestructorCall(GD, Callee, This.getPointer(), ThisTy,
1996  ImplicitParam, Context.IntTy, CE);
1997  return RV.getScalarVal();
1998 }
1999 
2000 const VBTableGlobals &
2001 MicrosoftCXXABI::enumerateVBTables(const CXXRecordDecl *RD) {
2002  // At this layer, we can key the cache off of a single class, which is much
2003  // easier than caching each vbtable individually.
2004  llvm::DenseMap<const CXXRecordDecl*, VBTableGlobals>::iterator Entry;
2005  bool Added;
2006  std::tie(Entry, Added) =
2007  VBTablesMap.insert(std::make_pair(RD, VBTableGlobals()));
2008  VBTableGlobals &VBGlobals = Entry->second;
2009  if (!Added)
2010  return VBGlobals;
2011 
2012  MicrosoftVTableContext &Context = CGM.getMicrosoftVTableContext();
2013  VBGlobals.VBTables = &Context.enumerateVBTables(RD);
2014 
2015  // Cache the globals for all vbtables so we don't have to recompute the
2016  // mangled names.
2017  llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
2018  for (VPtrInfoVector::const_iterator I = VBGlobals.VBTables->begin(),
2019  E = VBGlobals.VBTables->end();
2020  I != E; ++I) {
2021  VBGlobals.Globals.push_back(getAddrOfVBTable(**I, RD, Linkage));
2022  }
2023 
2024  return VBGlobals;
2025 }
2026 
2027 llvm::Function *
2028 MicrosoftCXXABI::EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
2029  const MethodVFTableLocation &ML) {
2030  assert(!isa<CXXConstructorDecl>(MD) && !isa<CXXDestructorDecl>(MD) &&
2031  "can't form pointers to ctors or virtual dtors");
2032 
2033  // Calculate the mangled name.
2034  SmallString<256> ThunkName;
2035  llvm::raw_svector_ostream Out(ThunkName);
2036  getMangleContext().mangleVirtualMemPtrThunk(MD, ML, Out);
2037 
2038  // If the thunk has been generated previously, just return it.
2039  if (llvm::GlobalValue *GV = CGM.getModule().getNamedValue(ThunkName))
2040  return cast<llvm::Function>(GV);
2041 
2042  // Create the llvm::Function.
2043  const CGFunctionInfo &FnInfo =
2044  CGM.getTypes().arrangeUnprototypedMustTailThunk(MD);
2045  llvm::FunctionType *ThunkTy = CGM.getTypes().GetFunctionType(FnInfo);
2046  llvm::Function *ThunkFn =
2047  llvm::Function::Create(ThunkTy, llvm::Function::ExternalLinkage,
2048  ThunkName.str(), &CGM.getModule());
2049  assert(ThunkFn->getName() == ThunkName && "name was uniqued!");
2050 
2051  ThunkFn->setLinkage(MD->isExternallyVisible()
2052  ? llvm::GlobalValue::LinkOnceODRLinkage
2054  if (MD->isExternallyVisible())
2055  ThunkFn->setComdat(CGM.getModule().getOrInsertComdat(ThunkFn->getName()));
2056 
2057  CGM.SetLLVMFunctionAttributes(MD, FnInfo, ThunkFn, /*IsThunk=*/false);
2058  CGM.SetLLVMFunctionAttributesForDefinition(MD, ThunkFn);
2059 
2060  // Add the "thunk" attribute so that LLVM knows that the return type is
2061  // meaningless. These thunks can be used to call functions with differing
2062  // return types, and the caller is required to cast the prototype
2063  // appropriately to extract the correct value.
2064  ThunkFn->addFnAttr("thunk");
2065 
2066  // These thunks can be compared, so they are not unnamed.
2067  ThunkFn->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::None);
2068 
2069  // Start codegen.
2070  CodeGenFunction CGF(CGM);
2071  CGF.CurGD = GlobalDecl(MD);
2072  CGF.CurFuncIsThunk = true;
2073 
2074  // Build FunctionArgs, but only include the implicit 'this' parameter
2075  // declaration.
2076  FunctionArgList FunctionArgs;
2077  buildThisParam(CGF, FunctionArgs);
2078 
2079  // Start defining the function.
2080  CGF.StartFunction(GlobalDecl(), FnInfo.getReturnType(), ThunkFn, FnInfo,
2081  FunctionArgs, MD->getLocation(), SourceLocation());
2082  setCXXABIThisValue(CGF, loadIncomingCXXThis(CGF));
2083 
2084  // Load the vfptr and then callee from the vftable. The callee should have
2085  // adjusted 'this' so that the vfptr is at offset zero.
2086  llvm::Type *ThunkPtrTy = ThunkTy->getPointerTo();
2087  llvm::Value *VTable = CGF.GetVTablePtr(
2088  getThisAddress(CGF), ThunkPtrTy->getPointerTo(), MD->getParent());
2089 
2090  llvm::Value *VFuncPtr = CGF.Builder.CreateConstInBoundsGEP1_64(
2091  ThunkPtrTy, VTable, ML.Index, "vfn");
2092  llvm::Value *Callee =
2093  CGF.Builder.CreateAlignedLoad(ThunkPtrTy, VFuncPtr, CGF.getPointerAlign());
2094 
2095  CGF.EmitMustTailThunk(MD, getThisValue(CGF), {ThunkTy, Callee});
2096 
2097  return ThunkFn;
2098 }
2099 
2100 void MicrosoftCXXABI::emitVirtualInheritanceTables(const CXXRecordDecl *RD) {
2101  const VBTableGlobals &VBGlobals = enumerateVBTables(RD);
2102  for (unsigned I = 0, E = VBGlobals.VBTables->size(); I != E; ++I) {
2103  const std::unique_ptr<VPtrInfo>& VBT = (*VBGlobals.VBTables)[I];
2104  llvm::GlobalVariable *GV = VBGlobals.Globals[I];
2105  if (GV->isDeclaration())
2106  emitVBTableDefinition(*VBT, RD, GV);
2107  }
2108 }
2109 
2110 llvm::GlobalVariable *
2111 MicrosoftCXXABI::getAddrOfVBTable(const VPtrInfo &VBT, const CXXRecordDecl *RD,
2112  llvm::GlobalVariable::LinkageTypes Linkage) {
2113  SmallString<256> OutName;
2114  llvm::raw_svector_ostream Out(OutName);
2115  getMangleContext().mangleCXXVBTable(RD, VBT.MangledPath, Out);
2116  StringRef Name = OutName.str();
2117 
2118  llvm::ArrayType *VBTableType =
2119  llvm::ArrayType::get(CGM.IntTy, 1 + VBT.ObjectWithVPtr->getNumVBases());
2120 
2121  assert(!CGM.getModule().getNamedGlobal(Name) &&
2122  "vbtable with this name already exists: mangling bug?");
2123  CharUnits Alignment =
2124  CGM.getContext().getTypeAlignInChars(CGM.getContext().IntTy);
2125  llvm::GlobalVariable *GV = CGM.CreateOrReplaceCXXRuntimeVariable(
2126  Name, VBTableType, Linkage, Alignment.getQuantity());
2127  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2128 
2129  if (RD->hasAttr<DLLImportAttr>())
2130  GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
2131  else if (RD->hasAttr<DLLExportAttr>())
2132  GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
2133 
2134  if (!GV->hasExternalLinkage())
2135  emitVBTableDefinition(VBT, RD, GV);
2136 
2137  return GV;
2138 }
2139 
2140 void MicrosoftCXXABI::emitVBTableDefinition(const VPtrInfo &VBT,
2141  const CXXRecordDecl *RD,
2142  llvm::GlobalVariable *GV) const {
2143  const CXXRecordDecl *ObjectWithVPtr = VBT.ObjectWithVPtr;
2144 
2145  assert(RD->getNumVBases() && ObjectWithVPtr->getNumVBases() &&
2146  "should only emit vbtables for classes with vbtables");
2147 
2148  const ASTRecordLayout &BaseLayout =
2149  getContext().getASTRecordLayout(VBT.IntroducingObject);
2150  const ASTRecordLayout &DerivedLayout = getContext().getASTRecordLayout(RD);
2151 
2152  SmallVector<llvm::Constant *, 4> Offsets(1 + ObjectWithVPtr->getNumVBases(),
2153  nullptr);
2154 
2155  // The offset from ObjectWithVPtr's vbptr to itself always leads.
2156  CharUnits VBPtrOffset = BaseLayout.getVBPtrOffset();
2157  Offsets[0] = llvm::ConstantInt::get(CGM.IntTy, -VBPtrOffset.getQuantity());
2158 
2159  MicrosoftVTableContext &Context = CGM.getMicrosoftVTableContext();
2160  for (const auto &I : ObjectWithVPtr->vbases()) {
2161  const CXXRecordDecl *VBase = I.getType()->getAsCXXRecordDecl();
2162  CharUnits Offset = DerivedLayout.getVBaseClassOffset(VBase);
2163  assert(!Offset.isNegative());
2164 
2165  // Make it relative to the subobject vbptr.
2166  CharUnits CompleteVBPtrOffset = VBT.NonVirtualOffset + VBPtrOffset;
2167  if (VBT.getVBaseWithVPtr())
2168  CompleteVBPtrOffset +=
2169  DerivedLayout.getVBaseClassOffset(VBT.getVBaseWithVPtr());
2170  Offset -= CompleteVBPtrOffset;
2171 
2172  unsigned VBIndex = Context.getVBTableIndex(ObjectWithVPtr, VBase);
2173  assert(Offsets[VBIndex] == nullptr && "The same vbindex seen twice?");
2174  Offsets[VBIndex] = llvm::ConstantInt::get(CGM.IntTy, Offset.getQuantity());
2175  }
2176 
2177  assert(Offsets.size() ==
2178  cast<llvm::ArrayType>(GV->getValueType())->getNumElements());
2179  llvm::ArrayType *VBTableType =
2180  llvm::ArrayType::get(CGM.IntTy, Offsets.size());
2181  llvm::Constant *Init = llvm::ConstantArray::get(VBTableType, Offsets);
2182  GV->setInitializer(Init);
2183 
2184  if (RD->hasAttr<DLLImportAttr>())
2185  GV->setLinkage(llvm::GlobalVariable::AvailableExternallyLinkage);
2186 }
2187 
2188 llvm::Value *MicrosoftCXXABI::performThisAdjustment(CodeGenFunction &CGF,
2189  Address This,
2190  const ThisAdjustment &TA) {
2191  if (TA.isEmpty())
2192  return This.getPointer();
2193 
2195 
2196  llvm::Value *V;
2197  if (TA.Virtual.isEmpty()) {
2198  V = This.getPointer();
2199  } else {
2200  assert(TA.Virtual.Microsoft.VtordispOffset < 0);
2201  // Adjust the this argument based on the vtordisp value.
2202  Address VtorDispPtr =
2205  VtorDispPtr = CGF.Builder.CreateElementBitCast(VtorDispPtr, CGF.Int32Ty);
2206  llvm::Value *VtorDisp = CGF.Builder.CreateLoad(VtorDispPtr, "vtordisp");
2207  V = CGF.Builder.CreateGEP(This.getElementType(), This.getPointer(),
2208  CGF.Builder.CreateNeg(VtorDisp));
2209 
2210  // Unfortunately, having applied the vtordisp means that we no
2211  // longer really have a known alignment for the vbptr step.
2212  // We'll assume the vbptr is pointer-aligned.
2213 
2214  if (TA.Virtual.Microsoft.VBPtrOffset) {
2215  // If the final overrider is defined in a virtual base other than the one
2216  // that holds the vfptr, we have to use a vtordispex thunk which looks up
2217  // the vbtable of the derived class.
2218  assert(TA.Virtual.Microsoft.VBPtrOffset > 0);
2219  assert(TA.Virtual.Microsoft.VBOffsetOffset >= 0);
2220  llvm::Value *VBPtr;
2221  llvm::Value *VBaseOffset = GetVBaseOffsetFromVBPtr(
2222  CGF, Address(V, CGF.Int8Ty, CGF.getPointerAlign()),
2224  TA.Virtual.Microsoft.VBOffsetOffset, &VBPtr);
2225  V = CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, VBPtr, VBaseOffset);
2226  }
2227  }
2228 
2229  if (TA.NonVirtual) {
2230  // Non-virtual adjustment might result in a pointer outside the allocated
2231  // object, e.g. if the final overrider class is laid out after the virtual
2232  // base that declares a method in the most derived class.
2233  V = CGF.Builder.CreateConstGEP1_32(CGF.Int8Ty, V, TA.NonVirtual);
2234  }
2235 
2236  // Don't need to bitcast back, the call CodeGen will handle this.
2237  return V;
2238 }
2239 
2240 llvm::Value *
2241 MicrosoftCXXABI::performReturnAdjustment(CodeGenFunction &CGF, Address Ret,
2242  const ReturnAdjustment &RA) {
2243  if (RA.isEmpty())
2244  return Ret.getPointer();
2245 
2246  auto OrigTy = Ret.getType();
2248 
2249  llvm::Value *V = Ret.getPointer();
2250  if (RA.Virtual.Microsoft.VBIndex) {
2251  assert(RA.Virtual.Microsoft.VBIndex > 0);
2252  int32_t IntSize = CGF.getIntSize().getQuantity();
2253  llvm::Value *VBPtr;
2254  llvm::Value *VBaseOffset =
2255  GetVBaseOffsetFromVBPtr(CGF, Ret, RA.Virtual.Microsoft.VBPtrOffset,
2256  IntSize * RA.Virtual.Microsoft.VBIndex, &VBPtr);
2257  V = CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, VBPtr, VBaseOffset);
2258  }
2259 
2260  if (RA.NonVirtual)
2261  V = CGF.Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, V, RA.NonVirtual);
2262 
2263  // Cast back to the original type.
2264  return CGF.Builder.CreateBitCast(V, OrigTy);
2265 }
2266 
2267 bool MicrosoftCXXABI::requiresArrayCookie(const CXXDeleteExpr *expr,
2268  QualType elementType) {
2269  // Microsoft seems to completely ignore the possibility of a
2270  // two-argument usual deallocation function.
2271  return elementType.isDestructedType();
2272 }
2273 
2274 bool MicrosoftCXXABI::requiresArrayCookie(const CXXNewExpr *expr) {
2275  // Microsoft seems to completely ignore the possibility of a
2276  // two-argument usual deallocation function.
2277  return expr->getAllocatedType().isDestructedType();
2278 }
2279 
2280 CharUnits MicrosoftCXXABI::getArrayCookieSizeImpl(QualType type) {
2281  // The array cookie is always a size_t; we then pad that out to the
2282  // alignment of the element type.
2283  ASTContext &Ctx = getContext();
2284  return std::max(Ctx.getTypeSizeInChars(Ctx.getSizeType()),
2285  Ctx.getTypeAlignInChars(type));
2286 }
2287 
2288 llvm::Value *MicrosoftCXXABI::readArrayCookieImpl(CodeGenFunction &CGF,
2289  Address allocPtr,
2290  CharUnits cookieSize) {
2291  Address numElementsPtr =
2292  CGF.Builder.CreateElementBitCast(allocPtr, CGF.SizeTy);
2293  return CGF.Builder.CreateLoad(numElementsPtr);
2294 }
2295 
2296 Address MicrosoftCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
2297  Address newPtr,
2298  llvm::Value *numElements,
2299  const CXXNewExpr *expr,
2300  QualType elementType) {
2301  assert(requiresArrayCookie(expr));
2302 
2303  // The size of the cookie.
2304  CharUnits cookieSize = getArrayCookieSizeImpl(elementType);
2305 
2306  // Compute an offset to the cookie.
2307  Address cookiePtr = newPtr;
2308 
2309  // Write the number of elements into the appropriate slot.
2310  Address numElementsPtr
2311  = CGF.Builder.CreateElementBitCast(cookiePtr, CGF.SizeTy);
2312  CGF.Builder.CreateStore(numElements, numElementsPtr);
2313 
2314  // Finally, compute a pointer to the actual data buffer by skipping
2315  // over the cookie completely.
2316  return CGF.Builder.CreateConstInBoundsByteGEP(newPtr, cookieSize);
2317 }
2318 
2320  llvm::FunctionCallee Dtor,
2321  llvm::Constant *Addr) {
2322  // Create a function which calls the destructor.
2323  llvm::Constant *DtorStub = CGF.createAtExitStub(VD, Dtor, Addr);
2324 
2325  // extern "C" int __tlregdtor(void (*f)(void));
2326  llvm::FunctionType *TLRegDtorTy = llvm::FunctionType::get(
2327  CGF.IntTy, DtorStub->getType(), /*isVarArg=*/false);
2328 
2329  llvm::FunctionCallee TLRegDtor = CGF.CGM.CreateRuntimeFunction(
2330  TLRegDtorTy, "__tlregdtor", llvm::AttributeList(), /*Local=*/true);
2331  if (llvm::Function *TLRegDtorFn =
2332  dyn_cast<llvm::Function>(TLRegDtor.getCallee()))
2333  TLRegDtorFn->setDoesNotThrow();
2334 
2335  CGF.EmitNounwindRuntimeCall(TLRegDtor, DtorStub);
2336 }
2337 
2338 void MicrosoftCXXABI::registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
2339  llvm::FunctionCallee Dtor,
2340  llvm::Constant *Addr) {
2341  if (D.isNoDestroy(CGM.getContext()))
2342  return;
2343 
2344  if (D.getTLSKind())
2345  return emitGlobalDtorWithTLRegDtor(CGF, D, Dtor, Addr);
2346 
2347  // The default behavior is to use atexit.
2348  CGF.registerGlobalDtorWithAtExit(D, Dtor, Addr);
2349 }
2350 
2351 void MicrosoftCXXABI::EmitThreadLocalInitFuncs(
2352  CodeGenModule &CGM, ArrayRef<const VarDecl *> CXXThreadLocals,
2353  ArrayRef<llvm::Function *> CXXThreadLocalInits,
2354  ArrayRef<const VarDecl *> CXXThreadLocalInitVars) {
2355  if (CXXThreadLocalInits.empty())
2356  return;
2357 
2358  CGM.AppendLinkerOptions(CGM.getTarget().getTriple().getArch() ==
2359  llvm::Triple::x86
2360  ? "/include:___dyn_tls_init@12"
2361  : "/include:__dyn_tls_init");
2362 
2363  // This will create a GV in the .CRT$XDU section. It will point to our
2364  // initialization function. The CRT will call all of these function
2365  // pointers at start-up time and, eventually, at thread-creation time.
2366  auto AddToXDU = [&CGM](llvm::Function *InitFunc) {
2367  llvm::GlobalVariable *InitFuncPtr = new llvm::GlobalVariable(
2368  CGM.getModule(), InitFunc->getType(), /*isConstant=*/true,
2370  Twine(InitFunc->getName(), "$initializer$"));
2371  InitFuncPtr->setSection(".CRT$XDU");
2372  // This variable has discardable linkage, we have to add it to @llvm.used to
2373  // ensure it won't get discarded.
2374  CGM.addUsedGlobal(InitFuncPtr);
2375  return InitFuncPtr;
2376  };
2377 
2378  std::vector<llvm::Function *> NonComdatInits;
2379  for (size_t I = 0, E = CXXThreadLocalInitVars.size(); I != E; ++I) {
2380  llvm::GlobalVariable *GV = cast<llvm::GlobalVariable>(
2381  CGM.GetGlobalValue(CGM.getMangledName(CXXThreadLocalInitVars[I])));
2382  llvm::Function *F = CXXThreadLocalInits[I];
2383 
2384  // If the GV is already in a comdat group, then we have to join it.
2385  if (llvm::Comdat *C = GV->getComdat())
2386  AddToXDU(F)->setComdat(C);
2387  else
2388  NonComdatInits.push_back(F);
2389  }
2390 
2391  if (!NonComdatInits.empty()) {
2392  llvm::FunctionType *FTy =
2393  llvm::FunctionType::get(CGM.VoidTy, /*isVarArg=*/false);
2394  llvm::Function *InitFunc = CGM.CreateGlobalInitOrCleanUpFunction(
2395  FTy, "__tls_init", CGM.getTypes().arrangeNullaryFunction(),
2396  SourceLocation(), /*TLS=*/true);
2397  CodeGenFunction(CGM).GenerateCXXGlobalInitFunc(InitFunc, NonComdatInits);
2398 
2399  AddToXDU(InitFunc);
2400  }
2401 }
2402 
2403 static llvm::GlobalValue *getTlsGuardVar(CodeGenModule &CGM) {
2404  // __tls_guard comes from the MSVC runtime and reflects
2405  // whether TLS has been initialized for a particular thread.
2406  // It is set from within __dyn_tls_init by the runtime.
2407  // Every library and executable has its own variable.
2408  llvm::Type *VTy = llvm::Type::getInt8Ty(CGM.getLLVMContext());
2409  llvm::Constant *TlsGuardConstant =
2410  CGM.CreateRuntimeVariable(VTy, "__tls_guard");
2411  llvm::GlobalValue *TlsGuard = cast<llvm::GlobalValue>(TlsGuardConstant);
2412 
2413  TlsGuard->setThreadLocal(true);
2414 
2415  return TlsGuard;
2416 }
2417 
2418 static llvm::FunctionCallee getDynTlsOnDemandInitFn(CodeGenModule &CGM) {
2419  // __dyn_tls_on_demand_init comes from the MSVC runtime and triggers
2420  // dynamic TLS initialization by calling __dyn_tls_init internally.
2421  llvm::FunctionType *FTy =
2422  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()), {},
2423  /*isVarArg=*/false);
2424  return CGM.CreateRuntimeFunction(
2425  FTy, "__dyn_tls_on_demand_init",
2426  llvm::AttributeList::get(CGM.getLLVMContext(),
2427  llvm::AttributeList::FunctionIndex,
2428  llvm::Attribute::NoUnwind),
2429  /*Local=*/true);
2430 }
2431 
2432 static void emitTlsGuardCheck(CodeGenFunction &CGF, llvm::GlobalValue *TlsGuard,
2433  llvm::BasicBlock *DynInitBB,
2434  llvm::BasicBlock *ContinueBB) {
2435  llvm::LoadInst *TlsGuardValue =
2436  CGF.Builder.CreateLoad(Address(TlsGuard, CGF.Int8Ty, CharUnits::One()));
2437  llvm::Value *CmpResult =
2438  CGF.Builder.CreateICmpEQ(TlsGuardValue, CGF.Builder.getInt8(0));
2439  CGF.Builder.CreateCondBr(CmpResult, DynInitBB, ContinueBB);
2440 }
2441 
2443  llvm::GlobalValue *TlsGuard,
2444  llvm::BasicBlock *ContinueBB) {
2445  llvm::FunctionCallee Initializer = getDynTlsOnDemandInitFn(CGF.CGM);
2446  llvm::Function *InitializerFunction =
2447  cast<llvm::Function>(Initializer.getCallee());
2448  llvm::CallInst *CallVal = CGF.Builder.CreateCall(InitializerFunction);
2449  CallVal->setCallingConv(InitializerFunction->getCallingConv());
2450 
2451  CGF.Builder.CreateBr(ContinueBB);
2452 }
2453 
2455  llvm::BasicBlock *DynInitBB =
2456  CGF.createBasicBlock("dyntls.dyn_init", CGF.CurFn);
2457  llvm::BasicBlock *ContinueBB =
2458  CGF.createBasicBlock("dyntls.continue", CGF.CurFn);
2459 
2460  llvm::GlobalValue *TlsGuard = getTlsGuardVar(CGF.CGM);
2461 
2462  emitTlsGuardCheck(CGF, TlsGuard, DynInitBB, ContinueBB);
2463  CGF.Builder.SetInsertPoint(DynInitBB);
2464  emitDynamicTlsInitializationCall(CGF, TlsGuard, ContinueBB);
2465  CGF.Builder.SetInsertPoint(ContinueBB);
2466 }
2467 
2468 LValue MicrosoftCXXABI::EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF,
2469  const VarDecl *VD,
2470  QualType LValType) {
2471  // Dynamic TLS initialization works by checking the state of a
2472  // guard variable (__tls_guard) to see whether TLS initialization
2473  // for a thread has happend yet.
2474  // If not, the initialization is triggered on-demand
2475  // by calling __dyn_tls_on_demand_init.
2477 
2478  // Emit the variable just like any regular global variable.
2479 
2480  llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
2481  llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
2482 
2483  unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
2484  V = CGF.Builder.CreateBitCast(V, RealVarTy->getPointerTo(AS));
2485 
2486  CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
2487  Address Addr(V, RealVarTy, Alignment);
2488 
2489  LValue LV = VD->getType()->isReferenceType()
2490  ? CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
2492  : CGF.MakeAddrLValue(Addr, LValType, AlignmentSource::Decl);
2493  return LV;
2494 }
2495 
2497  StringRef VarName("_Init_thread_epoch");
2498  CharUnits Align = CGM.getIntAlign();
2499  if (auto *GV = CGM.getModule().getNamedGlobal(VarName))
2500  return ConstantAddress(GV, GV->getValueType(), Align);
2501  auto *GV = new llvm::GlobalVariable(
2502  CGM.getModule(), CGM.IntTy,
2503  /*isConstant=*/false, llvm::GlobalVariable::ExternalLinkage,
2504  /*Initializer=*/nullptr, VarName,
2505  /*InsertBefore=*/nullptr, llvm::GlobalVariable::GeneralDynamicTLSModel);
2506  GV->setAlignment(Align.getAsAlign());
2507  return ConstantAddress(GV, GV->getValueType(), Align);
2508 }
2509 
2510 static llvm::FunctionCallee getInitThreadHeaderFn(CodeGenModule &CGM) {
2511  llvm::FunctionType *FTy =
2512  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
2513  CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
2514  return CGM.CreateRuntimeFunction(
2515  FTy, "_Init_thread_header",
2516  llvm::AttributeList::get(CGM.getLLVMContext(),
2517  llvm::AttributeList::FunctionIndex,
2518  llvm::Attribute::NoUnwind),
2519  /*Local=*/true);
2520 }
2521 
2522 static llvm::FunctionCallee getInitThreadFooterFn(CodeGenModule &CGM) {
2523  llvm::FunctionType *FTy =
2524  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
2525  CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
2526  return CGM.CreateRuntimeFunction(
2527  FTy, "_Init_thread_footer",
2528  llvm::AttributeList::get(CGM.getLLVMContext(),
2529  llvm::AttributeList::FunctionIndex,
2530  llvm::Attribute::NoUnwind),
2531  /*Local=*/true);
2532 }
2533 
2534 static llvm::FunctionCallee getInitThreadAbortFn(CodeGenModule &CGM) {
2535  llvm::FunctionType *FTy =
2536  llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
2537  CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
2538  return CGM.CreateRuntimeFunction(
2539  FTy, "_Init_thread_abort",
2540  llvm::AttributeList::get(CGM.getLLVMContext(),
2541  llvm::AttributeList::FunctionIndex,
2542  llvm::Attribute::NoUnwind),
2543  /*Local=*/true);
2544 }
2545 
2546 namespace {
2547 struct ResetGuardBit final : EHScopeStack::Cleanup {
2548  Address Guard;
2549  unsigned GuardNum;
2550  ResetGuardBit(Address Guard, unsigned GuardNum)
2551  : Guard(Guard), GuardNum(GuardNum) {}
2552 
2553  void Emit(CodeGenFunction &CGF, Flags flags) override {
2554  // Reset the bit in the mask so that the static variable may be
2555  // reinitialized.
2556  CGBuilderTy &Builder = CGF.Builder;
2557  llvm::LoadInst *LI = Builder.CreateLoad(Guard);
2558  llvm::ConstantInt *Mask =
2559  llvm::ConstantInt::get(CGF.IntTy, ~(1ULL << GuardNum));
2560  Builder.CreateStore(Builder.CreateAnd(LI, Mask), Guard);
2561  }
2562 };
2563 
2564 struct CallInitThreadAbort final : EHScopeStack::Cleanup {
2565  llvm::Value *Guard;
2566  CallInitThreadAbort(Address Guard) : Guard(Guard.getPointer()) {}
2567 
2568  void Emit(CodeGenFunction &CGF, Flags flags) override {
2569  // Calling _Init_thread_abort will reset the guard's state.
2571  }
2572 };
2573 }
2574 
2575 void MicrosoftCXXABI::EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
2576  llvm::GlobalVariable *GV,
2577  bool PerformInit) {
2578  // MSVC only uses guards for static locals.
2579  if (!D.isStaticLocal()) {
2580  assert(GV->hasWeakLinkage() || GV->hasLinkOnceLinkage());
2581  // GlobalOpt is allowed to discard the initializer, so use linkonce_odr.
2582  llvm::Function *F = CGF.CurFn;
2583  F->setLinkage(llvm::GlobalValue::LinkOnceODRLinkage);
2584  F->setComdat(CGM.getModule().getOrInsertComdat(F->getName()));
2585  CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
2586  return;
2587  }
2588 
2589  bool ThreadlocalStatic = D.getTLSKind();
2590  bool ThreadsafeStatic = getContext().getLangOpts().ThreadsafeStatics;
2591 
2592  // Thread-safe static variables which aren't thread-specific have a
2593  // per-variable guard.
2594  bool HasPerVariableGuard = ThreadsafeStatic && !ThreadlocalStatic;
2595 
2596  CGBuilderTy &Builder = CGF.Builder;
2597  llvm::IntegerType *GuardTy = CGF.Int32Ty;
2598  llvm::ConstantInt *Zero = llvm::ConstantInt::get(GuardTy, 0);
2599  CharUnits GuardAlign = CharUnits::fromQuantity(4);
2600 
2601  // Get the guard variable for this function if we have one already.
2602  GuardInfo *GI = nullptr;
2603  if (ThreadlocalStatic)
2604  GI = &ThreadLocalGuardVariableMap[D.getDeclContext()];
2605  else if (!ThreadsafeStatic)
2606  GI = &GuardVariableMap[D.getDeclContext()];
2607 
2608  llvm::GlobalVariable *GuardVar = GI ? GI->Guard : nullptr;
2609  unsigned GuardNum;
2610  if (D.isExternallyVisible()) {
2611  // Externally visible variables have to be numbered in Sema to properly
2612  // handle unreachable VarDecls.
2613  GuardNum = getContext().getStaticLocalNumber(&D);
2614  assert(GuardNum > 0);
2615  GuardNum--;
2616  } else if (HasPerVariableGuard) {
2617  GuardNum = ThreadSafeGuardNumMap[D.getDeclContext()]++;
2618  } else {
2619  // Non-externally visible variables are numbered here in CodeGen.
2620  GuardNum = GI->BitIndex++;
2621  }
2622 
2623  if (!HasPerVariableGuard && GuardNum >= 32) {
2624  if (D.isExternallyVisible())
2625  ErrorUnsupportedABI(CGF, "more than 32 guarded initializations");
2626  GuardNum %= 32;
2627  GuardVar = nullptr;
2628  }
2629 
2630  if (!GuardVar) {
2631  // Mangle the name for the guard.
2632  SmallString<256> GuardName;
2633  {
2634  llvm::raw_svector_ostream Out(GuardName);
2635  if (HasPerVariableGuard)
2636  getMangleContext().mangleThreadSafeStaticGuardVariable(&D, GuardNum,
2637  Out);
2638  else
2639  getMangleContext().mangleStaticGuardVariable(&D, Out);
2640  }
2641 
2642  // Create the guard variable with a zero-initializer. Just absorb linkage,
2643  // visibility and dll storage class from the guarded variable.
2644  GuardVar =
2645  new llvm::GlobalVariable(CGM.getModule(), GuardTy, /*isConstant=*/false,
2646  GV->getLinkage(), Zero, GuardName.str());
2647  GuardVar->setVisibility(GV->getVisibility());
2648  GuardVar->setDLLStorageClass(GV->getDLLStorageClass());
2649  GuardVar->setAlignment(GuardAlign.getAsAlign());
2650  if (GuardVar->isWeakForLinker())
2651  GuardVar->setComdat(
2652  CGM.getModule().getOrInsertComdat(GuardVar->getName()));
2653  if (D.getTLSKind())
2654  CGM.setTLSMode(GuardVar, D);
2655  if (GI && !HasPerVariableGuard)
2656  GI->Guard = GuardVar;
2657  }
2658 
2659  ConstantAddress GuardAddr(GuardVar, GuardTy, GuardAlign);
2660 
2661  assert(GuardVar->getLinkage() == GV->getLinkage() &&
2662  "static local from the same function had different linkage");
2663 
2664  if (!HasPerVariableGuard) {
2665  // Pseudo code for the test:
2666  // if (!(GuardVar & MyGuardBit)) {
2667  // GuardVar |= MyGuardBit;
2668  // ... initialize the object ...;
2669  // }
2670 
2671  // Test our bit from the guard variable.
2672  llvm::ConstantInt *Bit = llvm::ConstantInt::get(GuardTy, 1ULL << GuardNum);
2673  llvm::LoadInst *LI = Builder.CreateLoad(GuardAddr);
2674  llvm::Value *NeedsInit =
2675  Builder.CreateICmpEQ(Builder.CreateAnd(LI, Bit), Zero);
2676  llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
2677  llvm::BasicBlock *EndBlock = CGF.createBasicBlock("init.end");
2678  CGF.EmitCXXGuardedInitBranch(NeedsInit, InitBlock, EndBlock,
2680 
2681  // Set our bit in the guard variable and emit the initializer and add a global
2682  // destructor if appropriate.
2683  CGF.EmitBlock(InitBlock);
2684  Builder.CreateStore(Builder.CreateOr(LI, Bit), GuardAddr);
2685  CGF.EHStack.pushCleanup<ResetGuardBit>(EHCleanup, GuardAddr, GuardNum);
2686  CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
2687  CGF.PopCleanupBlock();
2688  Builder.CreateBr(EndBlock);
2689 
2690  // Continue.
2691  CGF.EmitBlock(EndBlock);
2692  } else {
2693  // Pseudo code for the test:
2694  // if (TSS > _Init_thread_epoch) {
2695  // _Init_thread_header(&TSS);
2696  // if (TSS == -1) {
2697  // ... initialize the object ...;
2698  // _Init_thread_footer(&TSS);
2699  // }
2700  // }
2701  //
2702  // The algorithm is almost identical to what can be found in the appendix
2703  // found in N2325.
2704 
2705  // This BasicBLock determines whether or not we have any work to do.
2706  llvm::LoadInst *FirstGuardLoad = Builder.CreateLoad(GuardAddr);
2707  FirstGuardLoad->setOrdering(llvm::AtomicOrdering::Unordered);
2708  llvm::LoadInst *InitThreadEpoch =
2709  Builder.CreateLoad(getInitThreadEpochPtr(CGM));
2710  llvm::Value *IsUninitialized =
2711  Builder.CreateICmpSGT(FirstGuardLoad, InitThreadEpoch);
2712  llvm::BasicBlock *AttemptInitBlock = CGF.createBasicBlock("init.attempt");
2713  llvm::BasicBlock *EndBlock = CGF.createBasicBlock("init.end");
2714  CGF.EmitCXXGuardedInitBranch(IsUninitialized, AttemptInitBlock, EndBlock,
2716 
2717  // This BasicBlock attempts to determine whether or not this thread is
2718  // responsible for doing the initialization.
2719  CGF.EmitBlock(AttemptInitBlock);
2721  GuardAddr.getPointer());
2722  llvm::LoadInst *SecondGuardLoad = Builder.CreateLoad(GuardAddr);
2723  SecondGuardLoad->setOrdering(llvm::AtomicOrdering::Unordered);
2724  llvm::Value *ShouldDoInit =
2725  Builder.CreateICmpEQ(SecondGuardLoad, getAllOnesInt());
2726  llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
2727  Builder.CreateCondBr(ShouldDoInit, InitBlock, EndBlock);
2728 
2729  // Ok, we ended up getting selected as the initializing thread.
2730  CGF.EmitBlock(InitBlock);
2731  CGF.EHStack.pushCleanup<CallInitThreadAbort>(EHCleanup, GuardAddr);
2732  CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
2733  CGF.PopCleanupBlock();
2735  GuardAddr.getPointer());
2736  Builder.CreateBr(EndBlock);
2737 
2738  CGF.EmitBlock(EndBlock);
2739  }
2740 }
2741 
2742 bool MicrosoftCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
2743  // Null-ness for function memptrs only depends on the first field, which is
2744  // the function pointer. The rest don't matter, so we can zero initialize.
2745  if (MPT->isMemberFunctionPointer())
2746  return true;
2747 
2748  // The virtual base adjustment field is always -1 for null, so if we have one
2749  // we can't zero initialize. The field offset is sometimes also -1 if 0 is a
2750  // valid field offset.
2751  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2752  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2753  return (!inheritanceModelHasVBTableOffsetField(Inheritance) &&
2754  RD->nullFieldOffsetIsZero());
2755 }
2756 
2757 llvm::Type *
2758 MicrosoftCXXABI::ConvertMemberPointerType(const MemberPointerType *MPT) {
2759  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2760  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2762  if (MPT->isMemberFunctionPointer())
2763  fields.push_back(CGM.VoidPtrTy); // FunctionPointerOrVirtualThunk
2764  else
2765  fields.push_back(CGM.IntTy); // FieldOffset
2766 
2768  Inheritance))
2769  fields.push_back(CGM.IntTy);
2770  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
2771  fields.push_back(CGM.IntTy);
2772  if (inheritanceModelHasVBTableOffsetField(Inheritance))
2773  fields.push_back(CGM.IntTy); // VirtualBaseAdjustmentOffset
2774 
2775  if (fields.size() == 1)
2776  return fields[0];
2777  return llvm::StructType::get(CGM.getLLVMContext(), fields);
2778 }
2779 
2780 void MicrosoftCXXABI::
2781 GetNullMemberPointerFields(const MemberPointerType *MPT,
2783  assert(fields.empty());
2784  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
2785  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2786  if (MPT->isMemberFunctionPointer()) {
2787  // FunctionPointerOrVirtualThunk
2788  fields.push_back(llvm::Constant::getNullValue(CGM.VoidPtrTy));
2789  } else {
2790  if (RD->nullFieldOffsetIsZero())
2791  fields.push_back(getZeroInt()); // FieldOffset
2792  else
2793  fields.push_back(getAllOnesInt()); // FieldOffset
2794  }
2795 
2797  Inheritance))
2798  fields.push_back(getZeroInt());
2799  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
2800  fields.push_back(getZeroInt());
2801  if (inheritanceModelHasVBTableOffsetField(Inheritance))
2802  fields.push_back(getAllOnesInt());
2803 }
2804 
2805 llvm::Constant *
2806 MicrosoftCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
2808  GetNullMemberPointerFields(MPT, fields);
2809  if (fields.size() == 1)
2810  return fields[0];
2811  llvm::Constant *Res = llvm::ConstantStruct::getAnon(fields);
2812  assert(Res->getType() == ConvertMemberPointerType(MPT));
2813  return Res;
2814 }
2815 
2816 llvm::Constant *
2817 MicrosoftCXXABI::EmitFullMemberPointer(llvm::Constant *FirstField,
2818  bool IsMemberFunction,
2819  const CXXRecordDecl *RD,
2820  CharUnits NonVirtualBaseAdjustment,
2821  unsigned VBTableIndex) {
2822  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
2823 
2824  // Single inheritance class member pointer are represented as scalars instead
2825  // of aggregates.
2826  if (inheritanceModelHasOnlyOneField(IsMemberFunction, Inheritance))
2827  return FirstField;
2828 
2830  fields.push_back(FirstField);
2831 
2832  if (inheritanceModelHasNVOffsetField(IsMemberFunction, Inheritance))
2833  fields.push_back(llvm::ConstantInt::get(
2834  CGM.IntTy, NonVirtualBaseAdjustment.getQuantity()));
2835 
2836  if (inheritanceModelHasVBPtrOffsetField(Inheritance)) {
2837  CharUnits Offs = CharUnits::Zero();
2838  if (VBTableIndex)
2839  Offs = getContext().getASTRecordLayout(RD).getVBPtrOffset();
2840  fields.push_back(llvm::ConstantInt::get(CGM.IntTy, Offs.getQuantity()));
2841  }
2842 
2843  // The rest of the fields are adjusted by conversions to a more derived class.
2844  if (inheritanceModelHasVBTableOffsetField(Inheritance))
2845  fields.push_back(llvm::ConstantInt::get(CGM.IntTy, VBTableIndex));
2846 
2847  return llvm::ConstantStruct::getAnon(fields);
2848 }
2849 
2850 llvm::Constant *
2851 MicrosoftCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
2852  CharUnits offset) {
2853  return EmitMemberDataPointer(MPT->getMostRecentCXXRecordDecl(), offset);
2854 }
2855 
2856 llvm::Constant *MicrosoftCXXABI::EmitMemberDataPointer(const CXXRecordDecl *RD,
2857  CharUnits offset) {
2858  if (RD->getMSInheritanceModel() ==
2860  offset -= getContext().getOffsetOfBaseWithVBPtr(RD);
2861  llvm::Constant *FirstField =
2862  llvm::ConstantInt::get(CGM.IntTy, offset.getQuantity());
2863  return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/false, RD,
2864  CharUnits::Zero(), /*VBTableIndex=*/0);
2865 }
2866 
2867 llvm::Constant *MicrosoftCXXABI::EmitMemberPointer(const APValue &MP,
2868  QualType MPType) {
2869  const MemberPointerType *DstTy = MPType->castAs<MemberPointerType>();
2870  const ValueDecl *MPD = MP.getMemberPointerDecl();
2871  if (!MPD)
2872  return EmitNullMemberPointer(DstTy);
2873 
2874  ASTContext &Ctx = getContext();
2875  ArrayRef<const CXXRecordDecl *> MemberPointerPath = MP.getMemberPointerPath();
2876 
2877  llvm::Constant *C;
2878  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MPD)) {
2879  C = EmitMemberFunctionPointer(MD);
2880  } else {
2881  // For a pointer to data member, start off with the offset of the field in
2882  // the class in which it was declared, and convert from there if necessary.
2883  // For indirect field decls, get the outermost anonymous field and use the
2884  // parent class.
2885  CharUnits FieldOffset = Ctx.toCharUnitsFromBits(Ctx.getFieldOffset(MPD));
2886  const FieldDecl *FD = dyn_cast<FieldDecl>(MPD);
2887  if (!FD)
2888  FD = cast<FieldDecl>(*cast<IndirectFieldDecl>(MPD)->chain_begin());
2889  const CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getParent());
2890  RD = RD->getMostRecentNonInjectedDecl();
2891  C = EmitMemberDataPointer(RD, FieldOffset);
2892  }
2893 
2894  if (!MemberPointerPath.empty()) {
2895  const CXXRecordDecl *SrcRD = cast<CXXRecordDecl>(MPD->getDeclContext());
2896  const Type *SrcRecTy = Ctx.getTypeDeclType(SrcRD).getTypePtr();
2897  const MemberPointerType *SrcTy =
2898  Ctx.getMemberPointerType(DstTy->getPointeeType(), SrcRecTy)
2900 
2901  bool DerivedMember = MP.isMemberPointerToDerivedMember();
2902  SmallVector<const CXXBaseSpecifier *, 4> DerivedToBasePath;
2903  const CXXRecordDecl *PrevRD = SrcRD;
2904  for (const CXXRecordDecl *PathElem : MemberPointerPath) {
2905  const CXXRecordDecl *Base = nullptr;
2906  const CXXRecordDecl *Derived = nullptr;
2907  if (DerivedMember) {
2908  Base = PathElem;
2909  Derived = PrevRD;
2910  } else {
2911  Base = PrevRD;
2912  Derived = PathElem;
2913  }
2914  for (const CXXBaseSpecifier &BS : Derived->bases())
2915  if (BS.getType()->getAsCXXRecordDecl()->getCanonicalDecl() ==
2916  Base->getCanonicalDecl())
2917  DerivedToBasePath.push_back(&BS);
2918  PrevRD = PathElem;
2919  }
2920  assert(DerivedToBasePath.size() == MemberPointerPath.size());
2921 
2922  CastKind CK = DerivedMember ? CK_DerivedToBaseMemberPointer
2923  : CK_BaseToDerivedMemberPointer;
2924  C = EmitMemberPointerConversion(SrcTy, DstTy, CK, DerivedToBasePath.begin(),
2925  DerivedToBasePath.end(), C);
2926  }
2927  return C;
2928 }
2929 
2930 llvm::Constant *
2931 MicrosoftCXXABI::EmitMemberFunctionPointer(const CXXMethodDecl *MD) {
2932  assert(MD->isInstance() && "Member function must not be static!");
2933 
2934  CharUnits NonVirtualBaseAdjustment = CharUnits::Zero();
2936  CodeGenTypes &Types = CGM.getTypes();
2937 
2938  unsigned VBTableIndex = 0;
2939  llvm::Constant *FirstField;
2940  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
2941  if (!MD->isVirtual()) {
2942  llvm::Type *Ty;
2943  // Check whether the function has a computable LLVM signature.
2944  if (Types.isFuncTypeConvertible(FPT)) {
2945  // The function has a computable LLVM signature; use the correct type.
2946  Ty = Types.GetFunctionType(Types.arrangeCXXMethodDeclaration(MD));
2947  } else {
2948  // Use an arbitrary non-function type to tell GetAddrOfFunction that the
2949  // function type is incomplete.
2950  Ty = CGM.PtrDiffTy;
2951  }
2952  FirstField = CGM.GetAddrOfFunction(MD, Ty);
2953  } else {
2954  auto &VTableContext = CGM.getMicrosoftVTableContext();
2955  MethodVFTableLocation ML = VTableContext.getMethodVFTableLocation(MD);
2956  FirstField = EmitVirtualMemPtrThunk(MD, ML);
2957  // Include the vfptr adjustment if the method is in a non-primary vftable.
2958  NonVirtualBaseAdjustment += ML.VFPtrOffset;
2959  if (ML.VBase)
2960  VBTableIndex = VTableContext.getVBTableIndex(RD, ML.VBase) * 4;
2961  }
2962 
2963  if (VBTableIndex == 0 &&
2964  RD->getMSInheritanceModel() ==
2966  NonVirtualBaseAdjustment -= getContext().getOffsetOfBaseWithVBPtr(RD);
2967 
2968  // The rest of the fields are common with data member pointers.
2969  FirstField = llvm::ConstantExpr::getBitCast(FirstField, CGM.VoidPtrTy);
2970  return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/true, RD,
2971  NonVirtualBaseAdjustment, VBTableIndex);
2972 }
2973 
2974 /// Member pointers are the same if they're either bitwise identical *or* both
2975 /// null. Null-ness for function members is determined by the first field,
2976 /// while for data member pointers we must compare all fields.
2977 llvm::Value *
2978 MicrosoftCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
2979  llvm::Value *L,
2980  llvm::Value *R,
2981  const MemberPointerType *MPT,
2982  bool Inequality) {
2983  CGBuilderTy &Builder = CGF.Builder;
2984 
2985  // Handle != comparisons by switching the sense of all boolean operations.
2986  llvm::ICmpInst::Predicate Eq;
2987  llvm::Instruction::BinaryOps And, Or;
2988  if (Inequality) {
2989  Eq = llvm::ICmpInst::ICMP_NE;
2990  And = llvm::Instruction::Or;
2992  } else {
2993  Eq = llvm::ICmpInst::ICMP_EQ;
2995  Or = llvm::Instruction::Or;
2996  }
2997 
2998  // If this is a single field member pointer (single inheritance), this is a
2999  // single icmp.
3000  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
3001  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
3003  Inheritance))
3004  return Builder.CreateICmp(Eq, L, R);
3005 
3006  // Compare the first field.
3007  llvm::Value *L0 = Builder.CreateExtractValue(L, 0, "lhs.0");
3008  llvm::Value *R0 = Builder.CreateExtractValue(R, 0, "rhs.0");
3009  llvm::Value *Cmp0 = Builder.CreateICmp(Eq, L0, R0, "memptr.cmp.first");
3010 
3011  // Compare everything other than the first field.
3012  llvm::Value *Res = nullptr;
3013  llvm::StructType *LType = cast<llvm::StructType>(L->getType());
3014  for (unsigned I = 1, E = LType->getNumElements(); I != E; ++I) {
3015  llvm::Value *LF = Builder.CreateExtractValue(L, I);
3016  llvm::Value *RF = Builder.CreateExtractValue(R, I);
3017  llvm::Value *Cmp = Builder.CreateICmp(Eq, LF, RF, "memptr.cmp.rest");
3018  if (Res)
3019  Res = Builder.CreateBinOp(And, Res, Cmp);
3020  else
3021  Res = Cmp;
3022  }
3023 
3024  // Check if the first field is 0 if this is a function pointer.
3025  if (MPT->isMemberFunctionPointer()) {
3026  // (l1 == r1 && ...) || l0 == 0
3027  llvm::Value *Zero = llvm::Constant::getNullValue(L0->getType());
3028  llvm::Value *IsZero = Builder.CreateICmp(Eq, L0, Zero, "memptr.cmp.iszero");
3029  Res = Builder.CreateBinOp(Or, Res, IsZero);
3030  }
3031 
3032  // Combine the comparison of the first field, which must always be true for
3033  // this comparison to succeeed.
3034  return Builder.CreateBinOp(And, Res, Cmp0, "memptr.cmp");
3035 }
3036 
3037 llvm::Value *
3038 MicrosoftCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
3039  llvm::Value *MemPtr,
3040  const MemberPointerType *MPT) {
3041  CGBuilderTy &Builder = CGF.Builder;
3043  // We only need one field for member functions.
3044  if (MPT->isMemberFunctionPointer())
3045  fields.push_back(llvm::Constant::getNullValue(CGM.VoidPtrTy));
3046  else
3047  GetNullMemberPointerFields(MPT, fields);
3048  assert(!fields.empty());
3049  llvm::Value *FirstField = MemPtr;
3050  if (MemPtr->getType()->isStructTy())
3051  FirstField = Builder.CreateExtractValue(MemPtr, 0);
3052  llvm::Value *Res = Builder.CreateICmpNE(FirstField, fields[0], "memptr.cmp0");
3053 
3054  // For function member pointers, we only need to test the function pointer
3055  // field. The other fields if any can be garbage.
3056  if (MPT->isMemberFunctionPointer())
3057  return Res;
3058 
3059  // Otherwise, emit a series of compares and combine the results.
3060  for (int I = 1, E = fields.size(); I < E; ++I) {
3061  llvm::Value *Field = Builder.CreateExtractValue(MemPtr, I);
3062  llvm::Value *Next = Builder.CreateICmpNE(Field, fields[I], "memptr.cmp");
3063  Res = Builder.CreateOr(Res, Next, "memptr.tobool");
3064  }
3065  return Res;
3066 }
3067 
3068 bool MicrosoftCXXABI::MemberPointerConstantIsNull(const MemberPointerType *MPT,
3069  llvm::Constant *Val) {
3070  // Function pointers are null if the pointer in the first field is null.
3071  if (MPT->isMemberFunctionPointer()) {
3072  llvm::Constant *FirstField = Val->getType()->isStructTy() ?
3073  Val->getAggregateElement(0U) : Val;
3074  return FirstField->isNullValue();
3075  }
3076 
3077  // If it's not a function pointer and it's zero initializable, we can easily
3078  // check zero.
3079  if (isZeroInitializable(MPT) && Val->isNullValue())
3080  return true;
3081 
3082  // Otherwise, break down all the fields for comparison. Hopefully these
3083  // little Constants are reused, while a big null struct might not be.
3085  GetNullMemberPointerFields(MPT, Fields);
3086  if (Fields.size() == 1) {
3087  assert(Val->getType()->isIntegerTy());
3088  return Val == Fields[0];
3089  }
3090 
3091  unsigned I, E;
3092  for (I = 0, E = Fields.size(); I != E; ++I) {
3093  if (Val->getAggregateElement(I) != Fields[I])
3094  break;
3095  }
3096  return I == E;
3097 }
3098 
3099 llvm::Value *
3100 MicrosoftCXXABI::GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
3101  Address This,
3102  llvm::Value *VBPtrOffset,
3103  llvm::Value *VBTableOffset,
3104  llvm::Value **VBPtrOut) {
3105  CGBuilderTy &Builder = CGF.Builder;
3106  // Load the vbtable pointer from the vbptr in the instance.
3107  This = Builder.CreateElementBitCast(This, CGM.Int8Ty);
3108  llvm::Value *VBPtr = Builder.CreateInBoundsGEP(
3109  This.getElementType(), This.getPointer(), VBPtrOffset, "vbptr");
3110  if (VBPtrOut) *VBPtrOut = VBPtr;
3111  VBPtr = Builder.CreateBitCast(VBPtr,
3112  CGM.Int32Ty->getPointerTo(0)->getPointerTo(This.getAddressSpace()));
3113 
3114  CharUnits VBPtrAlign;
3115  if (auto CI = dyn_cast<llvm::ConstantInt>(VBPtrOffset)) {
3116  VBPtrAlign = This.getAlignment().alignmentAtOffset(
3117  CharUnits::fromQuantity(CI->getSExtValue()));
3118  } else {
3119  VBPtrAlign = CGF.getPointerAlign();
3120  }
3121 
3122  llvm::Value *VBTable = Builder.CreateAlignedLoad(
3123  CGM.Int32Ty->getPointerTo(0), VBPtr, VBPtrAlign, "vbtable");
3124 
3125  // Translate from byte offset to table index. It improves analyzability.
3126  llvm::Value *VBTableIndex = Builder.CreateAShr(
3127  VBTableOffset, llvm::ConstantInt::get(VBTableOffset->getType(), 2),
3128  "vbtindex", /*isExact=*/true);
3129 
3130  // Load an i32 offset from the vb-table.
3131  llvm::Value *VBaseOffs =
3132  Builder.CreateInBoundsGEP(CGM.Int32Ty, VBTable, VBTableIndex);
3133  VBaseOffs = Builder.CreateBitCast(VBaseOffs, CGM.Int32Ty->getPointerTo(0));
3134  return Builder.CreateAlignedLoad(CGM.Int32Ty, VBaseOffs,
3135  CharUnits::fromQuantity(4), "vbase_offs");
3136 }
3137 
3138 // Returns an adjusted base cast to i8*, since we do more address arithmetic on
3139 // it.
3140 llvm::Value *MicrosoftCXXABI::AdjustVirtualBase(
3141  CodeGenFunction &CGF, const Expr *E, const CXXRecordDecl *RD,
3142  Address Base, llvm::Value *VBTableOffset, llvm::Value *VBPtrOffset) {
3143  CGBuilderTy &Builder = CGF.Builder;
3144  Base = Builder.CreateElementBitCast(Base, CGM.Int8Ty);
3145  llvm::BasicBlock *OriginalBB = nullptr;
3146  llvm::BasicBlock *SkipAdjustBB = nullptr;
3147  llvm::BasicBlock *VBaseAdjustBB = nullptr;
3148 
3149  // In the unspecified inheritance model, there might not be a vbtable at all,
3150  // in which case we need to skip the virtual base lookup. If there is a
3151  // vbtable, the first entry is a no-op entry that gives back the original
3152  // base, so look for a virtual base adjustment offset of zero.
3153  if (VBPtrOffset) {
3154  OriginalBB = Builder.GetInsertBlock();
3155  VBaseAdjustBB = CGF.createBasicBlock("memptr.vadjust");
3156  SkipAdjustBB = CGF.createBasicBlock("memptr.skip_vadjust");
3157  llvm::Value *IsVirtual =
3158  Builder.CreateICmpNE(VBTableOffset, getZeroInt(),
3159  "memptr.is_vbase");
3160  Builder.CreateCondBr(IsVirtual, VBaseAdjustBB, SkipAdjustBB);
3161  CGF.EmitBlock(VBaseAdjustBB);
3162  }
3163 
3164  // If we weren't given a dynamic vbptr offset, RD should be complete and we'll
3165  // know the vbptr offset.
3166  if (!VBPtrOffset) {
3167  CharUnits offs = CharUnits::Zero();
3168  if (!RD->hasDefinition()) {
3169  DiagnosticsEngine &Diags = CGF.CGM.getDiags();
3170  unsigned DiagID = Diags.getCustomDiagID(
3172  "member pointer representation requires a "
3173  "complete class type for %0 to perform this expression");
3174  Diags.Report(E->getExprLoc(), DiagID) << RD << E->getSourceRange();
3175  } else if (RD->getNumVBases())
3176  offs = getContext().getASTRecordLayout(RD).getVBPtrOffset();
3177  VBPtrOffset = llvm::ConstantInt::get(CGM.IntTy, offs.getQuantity());
3178  }
3179  llvm::Value *VBPtr = nullptr;
3180  llvm::Value *VBaseOffs =
3181  GetVBaseOffsetFromVBPtr(CGF, Base, VBPtrOffset, VBTableOffset, &VBPtr);
3182  llvm::Value *AdjustedBase =
3183  Builder.CreateInBoundsGEP(CGM.Int8Ty, VBPtr, VBaseOffs);
3184 
3185  // Merge control flow with the case where we didn't have to adjust.
3186  if (VBaseAdjustBB) {
3187  Builder.CreateBr(SkipAdjustBB);
3188  CGF.EmitBlock(SkipAdjustBB);
3189  llvm::PHINode *Phi = Builder.CreatePHI(CGM.Int8PtrTy, 2, "memptr.base");
3190  Phi->addIncoming(Base.getPointer(), OriginalBB);
3191  Phi->addIncoming(AdjustedBase, VBaseAdjustBB);
3192  return Phi;
3193  }
3194  return AdjustedBase;
3195 }
3196 
3197 llvm::Value *MicrosoftCXXABI::EmitMemberDataPointerAddress(
3198  CodeGenFunction &CGF, const Expr *E, Address Base, llvm::Value *MemPtr,
3199  const MemberPointerType *MPT) {
3200  assert(MPT->isMemberDataPointer());
3201  unsigned AS = Base.getAddressSpace();
3202  llvm::Type *PType =
3203  CGF.ConvertTypeForMem(MPT->getPointeeType())->getPointerTo(AS);
3204  CGBuilderTy &Builder = CGF.Builder;
3205  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
3206  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
3207 
3208  // Extract the fields we need, regardless of model. We'll apply them if we
3209  // have them.
3210  llvm::Value *FieldOffset = MemPtr;
3211  llvm::Value *VirtualBaseAdjustmentOffset = nullptr;
3212  llvm::Value *VBPtrOffset = nullptr;
3213  if (MemPtr->getType()->isStructTy()) {
3214  // We need to extract values.
3215  unsigned I = 0;
3216  FieldOffset = Builder.CreateExtractValue(MemPtr, I++);
3217  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
3218  VBPtrOffset = Builder.CreateExtractValue(MemPtr, I++);
3219  if (inheritanceModelHasVBTableOffsetField(Inheritance))
3220  VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(MemPtr, I++);
3221  }
3222 
3223  llvm::Value *Addr;
3224  if (VirtualBaseAdjustmentOffset) {
3225  Addr = AdjustVirtualBase(CGF, E, RD, Base, VirtualBaseAdjustmentOffset,
3226  VBPtrOffset);
3227  } else {
3228  Addr = Base.getPointer();
3229  }
3230 
3231  // Cast to char*.
3232  Addr = Builder.CreateBitCast(Addr, CGF.Int8Ty->getPointerTo(AS));
3233 
3234  // Apply the offset, which we assume is non-null.
3235  Addr = Builder.CreateInBoundsGEP(CGF.Int8Ty, Addr, FieldOffset,
3236  "memptr.offset");
3237 
3238  // Cast the address to the appropriate pointer type, adopting the address
3239  // space of the base pointer.
3240  return Builder.CreateBitCast(Addr, PType);
3241 }
3242 
3243 llvm::Value *
3244 MicrosoftCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
3245  const CastExpr *E,
3246  llvm::Value *Src) {
3247  assert(E->getCastKind() == CK_DerivedToBaseMemberPointer ||
3248  E->getCastKind() == CK_BaseToDerivedMemberPointer ||
3249  E->getCastKind() == CK_ReinterpretMemberPointer);
3250 
3251  // Use constant emission if we can.
3252  if (isa<llvm::Constant>(Src))
3253  return EmitMemberPointerConversion(E, cast<llvm::Constant>(Src));
3254 
3255  // We may be adding or dropping fields from the member pointer, so we need
3256  // both types and the inheritance models of both records.
3257  const MemberPointerType *SrcTy =
3259  const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
3260  bool IsFunc = SrcTy->isMemberFunctionPointer();
3261 
3262  // If the classes use the same null representation, reinterpret_cast is a nop.
3263  bool IsReinterpret = E->getCastKind() == CK_ReinterpretMemberPointer;
3264  if (IsReinterpret && IsFunc)
3265  return Src;
3266 
3267  CXXRecordDecl *SrcRD = SrcTy->getMostRecentCXXRecordDecl();
3268  CXXRecordDecl *DstRD = DstTy->getMostRecentCXXRecordDecl();
3269  if (IsReinterpret &&
3270  SrcRD->nullFieldOffsetIsZero() == DstRD->nullFieldOffsetIsZero())
3271  return Src;
3272 
3273  CGBuilderTy &Builder = CGF.Builder;
3274 
3275  // Branch past the conversion if Src is null.
3276  llvm::Value *IsNotNull = EmitMemberPointerIsNotNull(CGF, Src, SrcTy);
3277  llvm::Constant *DstNull = EmitNullMemberPointer(DstTy);
3278 
3279  // C++ 5.2.10p9: The null member pointer value is converted to the null member
3280  // pointer value of the destination type.
3281  if (IsReinterpret) {
3282  // For reinterpret casts, sema ensures that src and dst are both functions
3283  // or data and have the same size, which means the LLVM types should match.
3284  assert(Src->getType() == DstNull->getType());
3285  return Builder.CreateSelect(IsNotNull, Src, DstNull);
3286  }
3287 
3288  llvm::BasicBlock *OriginalBB = Builder.GetInsertBlock();
3289  llvm::BasicBlock *ConvertBB = CGF.createBasicBlock("memptr.convert");
3290  llvm::BasicBlock *ContinueBB = CGF.createBasicBlock("memptr.converted");
3291  Builder.CreateCondBr(IsNotNull, ConvertBB, ContinueBB);
3292  CGF.EmitBlock(ConvertBB);
3293 
3294  llvm::Value *Dst = EmitNonNullMemberPointerConversion(
3295  SrcTy, DstTy, E->getCastKind(), E->path_begin(), E->path_end(), Src,
3296  Builder);
3297 
3298  Builder.CreateBr(ContinueBB);
3299 
3300  // In the continuation, choose between DstNull and Dst.
3301  CGF.EmitBlock(ContinueBB);
3302  llvm::PHINode *Phi = Builder.CreatePHI(DstNull->getType(), 2, "memptr.converted");
3303  Phi->addIncoming(DstNull, OriginalBB);
3304  Phi->addIncoming(Dst, ConvertBB);
3305  return Phi;
3306 }
3307 
3308 llvm::Value *MicrosoftCXXABI::EmitNonNullMemberPointerConversion(
3309  const MemberPointerType *SrcTy, const MemberPointerType *DstTy, CastKind CK,
3311  CastExpr::path_const_iterator PathEnd, llvm::Value *Src,
3312  CGBuilderTy &Builder) {
3313  const CXXRecordDecl *SrcRD = SrcTy->getMostRecentCXXRecordDecl();
3314  const CXXRecordDecl *DstRD = DstTy->getMostRecentCXXRecordDecl();
3315  MSInheritanceModel SrcInheritance = SrcRD->getMSInheritanceModel();
3316  MSInheritanceModel DstInheritance = DstRD->getMSInheritanceModel();
3317  bool IsFunc = SrcTy->isMemberFunctionPointer();
3318  bool IsConstant = isa<llvm::Constant>(Src);
3319 
3320  // Decompose src.
3321  llvm::Value *FirstField = Src;
3322  llvm::Value *NonVirtualBaseAdjustment = getZeroInt();
3323  llvm::Value *VirtualBaseAdjustmentOffset = getZeroInt();
3324  llvm::Value *VBPtrOffset = getZeroInt();
3325  if (!inheritanceModelHasOnlyOneField(IsFunc, SrcInheritance)) {
3326  // We need to extract values.
3327  unsigned I = 0;
3328  FirstField = Builder.CreateExtractValue(Src, I++);
3329  if (inheritanceModelHasNVOffsetField(IsFunc, SrcInheritance))
3330  NonVirtualBaseAdjustment = Builder.CreateExtractValue(Src, I++);
3331  if (inheritanceModelHasVBPtrOffsetField(SrcInheritance))
3332  VBPtrOffset = Builder.CreateExtractValue(Src, I++);
3333  if (inheritanceModelHasVBTableOffsetField(SrcInheritance))
3334  VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(Src, I++);
3335  }
3336 
3337  bool IsDerivedToBase = (CK == CK_DerivedToBaseMemberPointer);
3338  const MemberPointerType *DerivedTy = IsDerivedToBase ? SrcTy : DstTy;
3339  const CXXRecordDecl *DerivedClass = DerivedTy->getMostRecentCXXRecordDecl();
3340 
3341  // For data pointers, we adjust the field offset directly. For functions, we
3342  // have a separate field.
3343  llvm::Value *&NVAdjustField = IsFunc ? NonVirtualBaseAdjustment : FirstField;
3344 
3345  // The virtual inheritance model has a quirk: the virtual base table is always
3346  // referenced when dereferencing a member pointer even if the member pointer
3347  // is non-virtual. This is accounted for by adjusting the non-virtual offset
3348  // to point backwards to the top of the MDC from the first VBase. Undo this
3349  // adjustment to normalize the member pointer.
3350  llvm::Value *SrcVBIndexEqZero =
3351  Builder.CreateICmpEQ(VirtualBaseAdjustmentOffset, getZeroInt());
3352  if (SrcInheritance == MSInheritanceModel::Virtual) {
3353  if (int64_t SrcOffsetToFirstVBase =
3354  getContext().getOffsetOfBaseWithVBPtr(SrcRD).getQuantity()) {
3355  llvm::Value *UndoSrcAdjustment = Builder.CreateSelect(
3356  SrcVBIndexEqZero,
3357  llvm::ConstantInt::get(CGM.IntTy, SrcOffsetToFirstVBase),
3358  getZeroInt());
3359  NVAdjustField = Builder.CreateNSWAdd(NVAdjustField, UndoSrcAdjustment);
3360  }
3361  }
3362 
3363  // A non-zero vbindex implies that we are dealing with a source member in a
3364  // floating virtual base in addition to some non-virtual offset. If the
3365  // vbindex is zero, we are dealing with a source that exists in a non-virtual,
3366  // fixed, base. The difference between these two cases is that the vbindex +
3367  // nvoffset *always* point to the member regardless of what context they are
3368  // evaluated in so long as the vbindex is adjusted. A member inside a fixed
3369  // base requires explicit nv adjustment.
3370  llvm::Constant *BaseClassOffset = llvm::ConstantInt::get(
3371  CGM.IntTy,
3372  CGM.computeNonVirtualBaseClassOffset(DerivedClass, PathBegin, PathEnd)
3373  .getQuantity());
3374 
3375  llvm::Value *NVDisp;
3376  if (IsDerivedToBase)
3377  NVDisp = Builder.CreateNSWSub(NVAdjustField, BaseClassOffset, "adj");
3378  else
3379  NVDisp = Builder.CreateNSWAdd(NVAdjustField, BaseClassOffset, "adj");
3380 
3381  NVAdjustField = Builder.CreateSelect(SrcVBIndexEqZero, NVDisp, getZeroInt());
3382 
3383  // Update the vbindex to an appropriate value in the destination because
3384  // SrcRD's vbtable might not be a strict prefix of the one in DstRD.
3385  llvm::Value *DstVBIndexEqZero = SrcVBIndexEqZero;
3386  if (inheritanceModelHasVBTableOffsetField(DstInheritance) &&
3387  inheritanceModelHasVBTableOffsetField(SrcInheritance)) {
3388  if (llvm::GlobalVariable *VDispMap =
3389  getAddrOfVirtualDisplacementMap(SrcRD, DstRD)) {
3390  llvm::Value *VBIndex = Builder.CreateExactUDiv(
3391  VirtualBaseAdjustmentOffset, llvm::ConstantInt::get(CGM.IntTy, 4));
3392  if (IsConstant) {
3393  llvm::Constant *Mapping = VDispMap->getInitializer();
3394  VirtualBaseAdjustmentOffset =
3395  Mapping->getAggregateElement(cast<llvm::Constant>(VBIndex));
3396  } else {
3397  llvm::Value *Idxs[] = {getZeroInt(), VBIndex};
3398  VirtualBaseAdjustmentOffset = Builder.CreateAlignedLoad(
3399  CGM.IntTy, Builder.CreateInBoundsGEP(VDispMap->getValueType(),
3400  VDispMap, Idxs),
3402  }
3403 
3404  DstVBIndexEqZero =
3405  Builder.CreateICmpEQ(VirtualBaseAdjustmentOffset, getZeroInt());
3406  }
3407  }
3408 
3409  // Set the VBPtrOffset to zero if the vbindex is zero. Otherwise, initialize
3410  // it to the offset of the vbptr.
3411  if (inheritanceModelHasVBPtrOffsetField(DstInheritance)) {
3412  llvm::Value *DstVBPtrOffset = llvm::ConstantInt::get(
3413  CGM.IntTy,
3414  getContext().getASTRecordLayout(DstRD).getVBPtrOffset().getQuantity());
3415  VBPtrOffset =
3416  Builder.CreateSelect(DstVBIndexEqZero, getZeroInt(), DstVBPtrOffset);
3417  }
3418 
3419  // Likewise, apply a similar adjustment so that dereferencing the member
3420  // pointer correctly accounts for the distance between the start of the first
3421  // virtual base and the top of the MDC.
3422  if (DstInheritance == MSInheritanceModel::Virtual) {
3423  if (int64_t DstOffsetToFirstVBase =
3424  getContext().getOffsetOfBaseWithVBPtr(DstRD).getQuantity()) {
3425  llvm::Value *DoDstAdjustment = Builder.CreateSelect(
3426  DstVBIndexEqZero,
3427  llvm::ConstantInt::get(CGM.IntTy, DstOffsetToFirstVBase),
3428  getZeroInt());
3429  NVAdjustField = Builder.CreateNSWSub(NVAdjustField, DoDstAdjustment);
3430  }
3431  }
3432 
3433  // Recompose dst from the null struct and the adjusted fields from src.
3434  llvm::Value *Dst;
3435  if (inheritanceModelHasOnlyOneField(IsFunc, DstInheritance)) {
3436  Dst = FirstField;
3437  } else {
3438  Dst = llvm::UndefValue::get(ConvertMemberPointerType(DstTy));
3439  unsigned Idx = 0;
3440  Dst = Builder.CreateInsertValue(Dst, FirstField, Idx++);
3441  if (inheritanceModelHasNVOffsetField(IsFunc, DstInheritance))
3442  Dst = Builder.CreateInsertValue(Dst, NonVirtualBaseAdjustment, Idx++);
3443  if (inheritanceModelHasVBPtrOffsetField(DstInheritance))
3444  Dst = Builder.CreateInsertValue(Dst, VBPtrOffset, Idx++);
3445  if (inheritanceModelHasVBTableOffsetField(DstInheritance))
3446  Dst = Builder.CreateInsertValue(Dst, VirtualBaseAdjustmentOffset, Idx++);
3447  }
3448  return Dst;
3449 }
3450 
3451 llvm::Constant *
3452 MicrosoftCXXABI::EmitMemberPointerConversion(const CastExpr *E,
3453  llvm::Constant *Src) {
3454  const MemberPointerType *SrcTy =
3456  const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
3457 
3458  CastKind CK = E->getCastKind();
3459 
3460  return EmitMemberPointerConversion(SrcTy, DstTy, CK, E->path_begin(),
3461  E->path_end(), Src);
3462 }
3463 
3464 llvm::Constant *MicrosoftCXXABI::EmitMemberPointerConversion(
3465  const MemberPointerType *SrcTy, const MemberPointerType *DstTy, CastKind CK,
3467  CastExpr::path_const_iterator PathEnd, llvm::Constant *Src) {
3468  assert(CK == CK_DerivedToBaseMemberPointer ||
3469  CK == CK_BaseToDerivedMemberPointer ||
3470  CK == CK_ReinterpretMemberPointer);
3471  // If src is null, emit a new null for dst. We can't return src because dst
3472  // might have a new representation.
3473  if (MemberPointerConstantIsNull(SrcTy, Src))
3474  return EmitNullMemberPointer(DstTy);
3475 
3476  // We don't need to do anything for reinterpret_casts of non-null member
3477  // pointers. We should only get here when the two type representations have
3478  // the same size.
3479  if (CK == CK_ReinterpretMemberPointer)
3480  return Src;
3481 
3482  CGBuilderTy Builder(CGM, CGM.getLLVMContext());
3483  auto *Dst = cast<llvm::Constant>(EmitNonNullMemberPointerConversion(
3484  SrcTy, DstTy, CK, PathBegin, PathEnd, Src, Builder));
3485 
3486  return Dst;
3487 }
3488 
3489 CGCallee MicrosoftCXXABI::EmitLoadOfMemberFunctionPointer(
3490  CodeGenFunction &CGF, const Expr *E, Address This,
3491  llvm::Value *&ThisPtrForCall, llvm::Value *MemPtr,
3492  const MemberPointerType *MPT) {
3493  assert(MPT->isMemberFunctionPointer());
3494  const FunctionProtoType *FPT =
3496  const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
3497  llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(
3498  CGM.getTypes().arrangeCXXMethodType(RD, FPT, /*FD=*/nullptr));
3499  CGBuilderTy &Builder = CGF.Builder;
3500 
3501  MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
3502 
3503  // Extract the fields we need, regardless of model. We'll apply them if we
3504  // have them.
3505  llvm::Value *FunctionPointer = MemPtr;
3506  llvm::Value *NonVirtualBaseAdjustment = nullptr;
3507  llvm::Value *VirtualBaseAdjustmentOffset = nullptr;
3508  llvm::Value *VBPtrOffset = nullptr;
3509  if (MemPtr->getType()->isStructTy()) {
3510  // We need to extract values.
3511  unsigned I = 0;
3512  FunctionPointer = Builder.CreateExtractValue(MemPtr, I++);
3513  if (inheritanceModelHasNVOffsetField(MPT, Inheritance))
3514  NonVirtualBaseAdjustment = Builder.CreateExtractValue(MemPtr, I++);
3515  if (inheritanceModelHasVBPtrOffsetField(Inheritance))
3516  VBPtrOffset = Builder.CreateExtractValue(MemPtr, I++);
3517  if (inheritanceModelHasVBTableOffsetField(Inheritance))
3518  VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(MemPtr, I++);
3519  }
3520 
3521  if (VirtualBaseAdjustmentOffset) {
3522  ThisPtrForCall = AdjustVirtualBase(CGF, E, RD, This,
3523  VirtualBaseAdjustmentOffset, VBPtrOffset);
3524  } else {
3525  ThisPtrForCall = This.getPointer();
3526  }
3527 
3528  if (NonVirtualBaseAdjustment) {
3529  // Apply the adjustment and cast back to the original struct type.
3530  llvm::Value *Ptr = Builder.CreateBitCast(ThisPtrForCall, CGF.Int8PtrTy);
3531  Ptr = Builder.CreateInBoundsGEP(CGF.Int8Ty, Ptr, NonVirtualBaseAdjustment);
3532  ThisPtrForCall = Builder.CreateBitCast(Ptr, ThisPtrForCall->getType(),
3533  "this.adjusted");
3534  }
3535 
3536  FunctionPointer =
3537  Builder.CreateBitCast(FunctionPointer, FTy->getPointerTo());
3538  CGCallee Callee(FPT, FunctionPointer);
3539  return Callee;
3540 }
3541 
3543  return new MicrosoftCXXABI(CGM);
3544 }
3545 
3546 // MS RTTI Overview:
3547 // The run time type information emitted by cl.exe contains 5 distinct types of
3548 // structures. Many of them reference each other.
3549 //
3550 // TypeInfo: Static classes that are returned by typeid.
3551 //
3552 // CompleteObjectLocator: Referenced by vftables. They contain information
3553 // required for dynamic casting, including OffsetFromTop. They also contain
3554 // a reference to the TypeInfo for the type and a reference to the
3555 // CompleteHierarchyDescriptor for the type.
3556 //
3557 // ClassHierarchyDescriptor: Contains information about a class hierarchy.
3558 // Used during dynamic_cast to walk a class hierarchy. References a base
3559 // class array and the size of said array.
3560 //
3561 // BaseClassArray: Contains a list of classes in a hierarchy. BaseClassArray is
3562 // somewhat of a misnomer because the most derived class is also in the list
3563 // as well as multiple copies of virtual bases (if they occur multiple times
3564 // in the hierarchy.) The BaseClassArray contains one BaseClassDescriptor for
3565 // every path in the hierarchy, in pre-order depth first order. Note, we do
3566 // not declare a specific llvm type for BaseClassArray, it's merely an array
3567 // of BaseClassDescriptor pointers.
3568 //
3569 // BaseClassDescriptor: Contains information about a class in a class hierarchy.
3570 // BaseClassDescriptor is also somewhat of a misnomer for the same reason that
3571 // BaseClassArray is. It contains information about a class within a
3572 // hierarchy such as: is this base is ambiguous and what is its offset in the
3573 // vbtable. The names of the BaseClassDescriptors have all of their fields
3574 // mangled into them so they can be aggressively deduplicated by the linker.
3575 
3576 static llvm::GlobalVariable *getTypeInfoVTable(CodeGenModule &CGM) {
3577  StringRef MangledName("??_7type_info@@6B@");
3578  if (auto VTable = CGM.getModule().getNamedGlobal(MangledName))
3579  return VTable;
3580  return new llvm::GlobalVariable(CGM.getModule(), CGM.Int8PtrTy,
3581  /*isConstant=*/true,
3583  /*Initializer=*/nullptr, MangledName);
3584 }
3585 
3586 namespace {
3587 
3588 /// A Helper struct that stores information about a class in a class
3589 /// hierarchy. The information stored in these structs struct is used during
3590 /// the generation of ClassHierarchyDescriptors and BaseClassDescriptors.
3591 // During RTTI creation, MSRTTIClasses are stored in a contiguous array with
3592 // implicit depth first pre-order tree connectivity. getFirstChild and
3593 // getNextSibling allow us to walk the tree efficiently.
3594 struct MSRTTIClass {
3595  enum {
3596  IsPrivateOnPath = 1 | 8,
3597  IsAmbiguous = 2,
3598  IsPrivate = 4,
3599  IsVirtual = 16,
3600  HasHierarchyDescriptor = 64
3601  };
3602  MSRTTIClass(const CXXRecordDecl *RD) : RD(RD) {}
3603  uint32_t initialize(const MSRTTIClass *Parent,
3604  const CXXBaseSpecifier *Specifier);
3605 
3606  MSRTTIClass *getFirstChild() { return this + 1; }
3607  static MSRTTIClass *getNextChild(MSRTTIClass *Child) {
3608  return Child + 1 + Child->NumBases;
3609  }
3610 
3611  const CXXRecordDecl *RD, *VirtualRoot;
3612  uint32_t Flags, NumBases, OffsetInVBase;
3613 };
3614 
3615 /// Recursively initialize the base class array.
3616 uint32_t MSRTTIClass::initialize(const MSRTTIClass *Parent,
3617  const CXXBaseSpecifier *Specifier) {
3618  Flags = HasHierarchyDescriptor;
3619  if (!Parent) {
3620  VirtualRoot = nullptr;
3621  OffsetInVBase = 0;
3622  } else {
3623  if (Specifier->getAccessSpecifier() != AS_public)
3624  Flags |= IsPrivate | IsPrivateOnPath;
3625  if (Specifier->isVirtual()) {
3626  Flags |= IsVirtual;
3627  VirtualRoot = RD;
3628  OffsetInVBase = 0;
3629  } else {
3630  if (Parent->Flags & IsPrivateOnPath)
3631  Flags |= IsPrivateOnPath;
3632  VirtualRoot = Parent->VirtualRoot;
3633  OffsetInVBase = Parent->OffsetInVBase + RD->getASTContext()
3634  .getASTRecordLayout(Parent->RD).getBaseClassOffset(RD).getQuantity();
3635  }
3636  }
3637  NumBases = 0;
3638  MSRTTIClass *Child = getFirstChild();
3639  for (const CXXBaseSpecifier &Base : RD->bases()) {
3640  NumBases += Child->initialize(this, &Base) + 1;
3641  Child = getNextChild(Child);
3642  }
3643  return NumBases;
3644 }
3645 
3646 static llvm::GlobalValue::LinkageTypes getLinkageForRTTI(QualType Ty) {
3647  switch (Ty->getLinkage()) {
3648  case NoLinkage:
3649  case InternalLinkage:
3650  case UniqueExternalLinkage:
3652 
3653  case VisibleNoLinkage:
3654  case ModuleInternalLinkage:
3655  case ModuleLinkage:
3656  case ExternalLinkage:
3657  return llvm::GlobalValue::LinkOnceODRLinkage;
3658  }
3659  llvm_unreachable("Invalid linkage!");
3660 }
3661 
3662 /// An ephemeral helper class for building MS RTTI types. It caches some
3663 /// calls to the module and information about the most derived class in a
3664 /// hierarchy.
3665 struct MSRTTIBuilder {
3666  enum {
3667  HasBranchingHierarchy = 1,
3668  HasVirtualBranchingHierarchy = 2,
3669  HasAmbiguousBases = 4
3670  };
3671 
3672  MSRTTIBuilder(MicrosoftCXXABI &ABI, const CXXRecordDecl *RD)
3673  : CGM(ABI.CGM), Context(CGM.getContext()),
3674  VMContext(CGM.getLLVMContext()), Module(CGM.getModule()), RD(RD),
3675  Linkage(getLinkageForRTTI(CGM.getContext().getTagDeclType(RD))),
3676  ABI(ABI) {}
3677 
3678  llvm::GlobalVariable *getBaseClassDescriptor(const MSRTTIClass &Classes);
3679  llvm::GlobalVariable *
3680  getBaseClassArray(SmallVectorImpl<MSRTTIClass> &Classes);
3681  llvm::GlobalVariable *getClassHierarchyDescriptor();
3682  llvm::GlobalVariable *getCompleteObjectLocator(const VPtrInfo &Info);
3683 
3684  CodeGenModule &CGM;
3685  ASTContext &Context;
3686  llvm::LLVMContext &VMContext;
3687  llvm::Module &Module;
3688  const CXXRecordDecl *RD;
3689  llvm::GlobalVariable::LinkageTypes Linkage;
3690  MicrosoftCXXABI &ABI;
3691 };
3692 
3693 } // namespace
3694 
3695 /// Recursively serializes a class hierarchy in pre-order depth first
3696 /// order.
3698  const CXXRecordDecl *RD) {
3699  Classes.push_back(MSRTTIClass(RD));
3700  for (const CXXBaseSpecifier &Base : RD->bases())
3701  serializeClassHierarchy(Classes, Base.getType()->getAsCXXRecordDecl());
3702 }
3703 
3704 /// Find ambiguity among base classes.
3705 static void
3710  for (MSRTTIClass *Class = &Classes.front(); Class <= &Classes.back();) {
3711  if ((Class->Flags & MSRTTIClass::IsVirtual) &&
3712  !VirtualBases.insert(Class->RD).second) {
3713  Class = MSRTTIClass::getNextChild(Class);
3714  continue;
3715  }
3716  if (!UniqueBases.insert(Class->RD).second)
3717  AmbiguousBases.insert(Class->RD);
3718  Class++;
3719  }
3720  if (AmbiguousBases.empty())
3721  return;
3722  for (MSRTTIClass &Class : Classes)
3723  if (AmbiguousBases.count(Class.RD))
3724  Class.Flags |= MSRTTIClass::IsAmbiguous;
3725 }
3726 
3727 llvm::GlobalVariable *MSRTTIBuilder::getClassHierarchyDescriptor() {
3728  SmallString<256> MangledName;
3729  {
3730  llvm::raw_svector_ostream Out(MangledName);
3731  ABI.getMangleContext().mangleCXXRTTIClassHierarchyDescriptor(RD, Out);
3732  }
3733 
3734  // Check to see if we've already declared this ClassHierarchyDescriptor.
3735  if (auto CHD = Module.getNamedGlobal(MangledName))
3736  return CHD;
3737 
3738  // Serialize the class hierarchy and initialize the CHD Fields.
3740  serializeClassHierarchy(Classes, RD);
3741  Classes.front().initialize(/*Parent=*/nullptr, /*Specifier=*/nullptr);
3742  detectAmbiguousBases(Classes);
3743  int Flags = 0;
3744  for (auto Class : Classes) {
3745  if (Class.RD->getNumBases() > 1)
3746  Flags |= HasBranchingHierarchy;
3747  // Note: cl.exe does not calculate "HasAmbiguousBases" correctly. We
3748  // believe the field isn't actually used.
3749  if (Class.Flags & MSRTTIClass::IsAmbiguous)
3750  Flags |= HasAmbiguousBases;
3751  }
3752  if ((Flags & HasBranchingHierarchy) && RD->getNumVBases() != 0)
3753  Flags |= HasVirtualBranchingHierarchy;
3754  // These gep indices are used to get the address of the first element of the
3755  // base class array.
3756  llvm::Value *GEPIndices[] = {llvm::ConstantInt::get(CGM.IntTy, 0),
3757  llvm::ConstantInt::get(CGM.IntTy, 0)};
3758 
3759  // Forward-declare the class hierarchy descriptor
3760  auto Type = ABI.getClassHierarchyDescriptorType();
3761  auto CHD = new llvm::GlobalVariable(Module, Type, /*isConstant=*/true, Linkage,
3762  /*Initializer=*/nullptr,
3763  MangledName);
3764  if (CHD->isWeakForLinker())
3765  CHD->setComdat(CGM.getModule().getOrInsertComdat(CHD->getName()));
3766 
3767  auto *Bases = getBaseClassArray(Classes);
3768 
3769  // Initialize the base class ClassHierarchyDescriptor.
3770  llvm::Constant *Fields[] = {
3771  llvm::ConstantInt::get(CGM.IntTy, 0), // reserved by the runtime
3772  llvm::ConstantInt::get(CGM.IntTy, Flags),
3773  llvm::ConstantInt::get(CGM.IntTy, Classes.size()),
3774  ABI.getImageRelativeConstant(llvm::ConstantExpr::getInBoundsGetElementPtr(
3775  Bases->getValueType(), Bases,
3776  llvm::ArrayRef<llvm::Value *>(GEPIndices))),
3777  };
3778  CHD->setInitializer(llvm::ConstantStruct::get(Type, Fields));
3779  return CHD;
3780 }
3781 
3782 llvm::GlobalVariable *
3783 MSRTTIBuilder::getBaseClassArray(SmallVectorImpl<MSRTTIClass> &Classes) {
3784  SmallString<256> MangledName;
3785  {
3786  llvm::raw_svector_ostream Out(MangledName);
3787  ABI.getMangleContext().mangleCXXRTTIBaseClassArray(RD, Out);
3788  }
3789 
3790  // Forward-declare the base class array.
3791  // cl.exe pads the base class array with 1 (in 32 bit mode) or 4 (in 64 bit
3792  // mode) bytes of padding. We provide a pointer sized amount of padding by
3793  // adding +1 to Classes.size(). The sections have pointer alignment and are
3794  // marked pick-any so it shouldn't matter.
3795  llvm::Type *PtrType = ABI.getImageRelativeType(
3796  ABI.getBaseClassDescriptorType()->getPointerTo());
3797  auto *ArrType = llvm::ArrayType::get(PtrType, Classes.size() + 1);
3798  auto *BCA =
3799  new llvm::GlobalVariable(Module, ArrType,
3800  /*isConstant=*/true, Linkage,
3801  /*Initializer=*/nullptr, MangledName);
3802  if (BCA->isWeakForLinker())
3803  BCA->setComdat(CGM.getModule().getOrInsertComdat(BCA->getName()));
3804 
3805  // Initialize the BaseClassArray.
3806  SmallVector<llvm::Constant *, 8> BaseClassArrayData;
3807  for (MSRTTIClass &Class : Classes)
3808  BaseClassArrayData.push_back(
3809  ABI.getImageRelativeConstant(getBaseClassDescriptor(Class)));
3810  BaseClassArrayData.push_back(llvm::Constant::getNullValue(PtrType));
3811  BCA->setInitializer(llvm::ConstantArray::get(ArrType, BaseClassArrayData));
3812  return BCA;
3813 }
3814 
3815 llvm::GlobalVariable *
3816 MSRTTIBuilder::getBaseClassDescriptor(const MSRTTIClass &Class) {
3817  // Compute the fields for the BaseClassDescriptor. They are computed up front
3818  // because they are mangled into the name of the object.
3819  uint32_t OffsetInVBTable = 0;
3820  int32_t VBPtrOffset = -1;
3821  if (Class.VirtualRoot) {
3822  auto &VTableContext = CGM.getMicrosoftVTableContext();
3823  OffsetInVBTable = VTableContext.getVBTableIndex(RD, Class.VirtualRoot) * 4;
3824  VBPtrOffset = Context.getASTRecordLayout(RD).getVBPtrOffset().getQuantity();
3825  }
3826 
3827  SmallString<256> MangledName;
3828  {
3829  llvm::raw_svector_ostream Out(MangledName);
3830  ABI.getMangleContext().mangleCXXRTTIBaseClassDescriptor(
3831  Class.RD, Class.OffsetInVBase, VBPtrOffset, OffsetInVBTable,
3832  Class.Flags, Out);
3833  }
3834 
3835  // Check to see if we've already declared this object.
3836  if (auto BCD = Module.getNamedGlobal(MangledName))
3837  return BCD;
3838 
3839  // Forward-declare the base class descriptor.
3840  auto Type = ABI.getBaseClassDescriptorType();
3841  auto BCD =
3842  new llvm::GlobalVariable(Module, Type, /*isConstant=*/true, Linkage,
3843  /*Initializer=*/nullptr, MangledName);
3844  if (BCD->isWeakForLinker())
3845  BCD->setComdat(CGM.getModule().getOrInsertComdat(BCD->getName()));
3846 
3847  // Initialize the BaseClassDescriptor.
3848  llvm::Constant *Fields[] = {
3849  ABI.getImageRelativeConstant(
3850  ABI.getAddrOfRTTIDescriptor(Context.getTypeDeclType(Class.RD))),
3851  llvm::ConstantInt::get(CGM.IntTy, Class.NumBases),
3852  llvm::ConstantInt::get(CGM.IntTy, Class.OffsetInVBase),
3853  llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset),
3854  llvm::ConstantInt::get(CGM.IntTy, OffsetInVBTable),
3855  llvm::ConstantInt::get(CGM.IntTy, Class.Flags),
3856  ABI.getImageRelativeConstant(
3857  MSRTTIBuilder(ABI, Class.RD).getClassHierarchyDescriptor()),
3858  };
3859  BCD->setInitializer(llvm::ConstantStruct::get(Type, Fields));
3860  return BCD;
3861 }
3862 
3863 llvm::GlobalVariable *
3864 MSRTTIBuilder::getCompleteObjectLocator(const VPtrInfo &Info) {
3865  SmallString<256> MangledName;
3866  {
3867  llvm::raw_svector_ostream Out(MangledName);
3868  ABI.getMangleContext().mangleCXXRTTICompleteObjectLocator(RD, Info.MangledPath, Out);
3869  }
3870 
3871  // Check to see if we've already computed this complete object locator.
3872  if (auto COL = Module.getNamedGlobal(MangledName))
3873  return COL;
3874 
3875  // Compute the fields of the complete object locator.
3876  int OffsetToTop = Info.FullOffsetInMDC.getQuantity();
3877  int VFPtrOffset = 0;
3878  // The offset includes the vtordisp if one exists.
3879  if (const CXXRecordDecl *VBase = Info.getVBaseWithVPtr())
3880  if (Context.getASTRecordLayout(RD)
3882  .find(VBase)
3883  ->second.hasVtorDisp())
3884  VFPtrOffset = Info.NonVirtualOffset.getQuantity() + 4;
3885 
3886  // Forward-declare the complete object locator.
3887  llvm::StructType *Type = ABI.getCompleteObjectLocatorType();
3888  auto COL = new llvm::GlobalVariable(Module, Type, /*isConstant=*/true, Linkage,
3889  /*Initializer=*/nullptr, MangledName);
3890 
3891  // Initialize the CompleteObjectLocator.
3892  llvm::Constant *Fields[] = {
3893  llvm::ConstantInt::get(CGM.IntTy, ABI.isImageRelative()),
3894  llvm::ConstantInt::get(CGM.IntTy, OffsetToTop),
3895  llvm::ConstantInt::get(CGM.IntTy, VFPtrOffset),
3896  ABI.getImageRelativeConstant(
3897  CGM.GetAddrOfRTTIDescriptor(Context.getTypeDeclType(RD))),
3898  ABI.getImageRelativeConstant(getClassHierarchyDescriptor()),
3899  ABI.getImageRelativeConstant(COL),
3900  };
3901  llvm::ArrayRef<llvm::Constant *> FieldsRef(Fields);
3902  if (!ABI.isImageRelative())
3903  FieldsRef = FieldsRef.drop_back();
3904  COL->setInitializer(llvm::ConstantStruct::get(Type, FieldsRef));
3905  if (COL->isWeakForLinker())
3906  COL->setComdat(CGM.getModule().getOrInsertComdat(COL->getName()));
3907  return COL;
3908 }
3909 
3911  bool &IsConst, bool &IsVolatile,
3912  bool &IsUnaligned) {
3913  T = Context.getExceptionObjectType(T);
3914 
3915  // C++14 [except.handle]p3:
3916  // A handler is a match for an exception object of type E if [...]
3917  // - the handler is of type cv T or const T& where T is a pointer type and
3918  // E is a pointer type that can be converted to T by [...]
3919  // - a qualification conversion
3920  IsConst = false;
3921  IsVolatile = false;
3922  IsUnaligned = false;
3923  QualType PointeeType = T->getPointeeType();
3924  if (!PointeeType.isNull()) {
3925  IsConst = PointeeType.isConstQualified();
3926  IsVolatile = PointeeType.isVolatileQualified();
3927  IsUnaligned = PointeeType.getQualifiers().hasUnaligned();
3928  }
3929 
3930  // Member pointer types like "const int A::*" are represented by having RTTI
3931  // for "int A::*" and separately storing the const qualifier.
3932  if (const auto *MPTy = T->getAs<MemberPointerType>())
3933  T = Context.getMemberPointerType(PointeeType.getUnqualifiedType(),
3934  MPTy->getClass());
3935 
3936  // Pointer types like "const int * const *" are represented by having RTTI
3937  // for "const int **" and separately storing the const qualifier.
3938  if (T->isPointerType())
3939  T = Context.getPointerType(PointeeType.getUnqualifiedType());
3940 
3941  return T;
3942 }
3943 
3945 MicrosoftCXXABI::getAddrOfCXXCatchHandlerType(QualType Type,
3946  QualType CatchHandlerType) {
3947  // TypeDescriptors for exceptions never have qualified pointer types,
3948  // qualifiers are stored separately in order to support qualification
3949  // conversions.
3950  bool IsConst, IsVolatile, IsUnaligned;
3951  Type =
3952  decomposeTypeForEH(getContext(), Type, IsConst, IsVolatile, IsUnaligned);
3953 
3954  bool IsReference = CatchHandlerType->isReferenceType();
3955 
3956  uint32_t Flags = 0;
3957  if (IsConst)
3958  Flags |= 1;
3959  if (IsVolatile)
3960  Flags |= 2;
3961  if (IsUnaligned)
3962  Flags |= 4;
3963  if (IsReference)
3964  Flags |= 8;
3965 
3966  return CatchTypeInfo{getAddrOfRTTIDescriptor(Type)->stripPointerCasts(),
3967  Flags};
3968 }
3969 
3970 /// Gets a TypeDescriptor. Returns a llvm::Constant * rather than a
3971 /// llvm::GlobalVariable * because different type descriptors have different
3972 /// types, and need to be abstracted. They are abstracting by casting the
3973 /// address to an Int8PtrTy.
3974 llvm::Constant *MicrosoftCXXABI::getAddrOfRTTIDescriptor(QualType Type) {
3975  SmallString<256> MangledName;
3976  {
3977  llvm::raw_svector_ostream Out(MangledName);
3978  getMangleContext().mangleCXXRTTI(Type, Out);
3979  }
3980 
3981  // Check to see if we've already declared this TypeDescriptor.
3982  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
3983  return llvm::ConstantExpr::getBitCast(GV, CGM.Int8PtrTy);
3984 
3985  // Note for the future: If we would ever like to do deferred emission of
3986  // RTTI, check if emitting vtables opportunistically need any adjustment.
3987 
3988  // Compute the fields for the TypeDescriptor.
3989  SmallString<256> TypeInfoString;
3990  {
3991  llvm::raw_svector_ostream Out(TypeInfoString);
3992  getMangleContext().mangleCXXRTTIName(Type, Out);
3993  }
3994 
3995  // Declare and initialize the TypeDescriptor.
3996  llvm::Constant *Fields[] = {
3997  getTypeInfoVTable(CGM), // VFPtr
3998  llvm::ConstantPointerNull::get(CGM.Int8PtrTy), // Runtime data
3999  llvm::ConstantDataArray::getString(CGM.getLLVMContext(), TypeInfoString)};
4000  llvm::StructType *TypeDescriptorType =
4001  getTypeDescriptorType(TypeInfoString);
4002  auto *Var = new llvm::GlobalVariable(
4003  CGM.getModule(), TypeDescriptorType, /*isConstant=*/false,
4004  getLinkageForRTTI(Type),
4005  llvm::ConstantStruct::get(TypeDescriptorType, Fields),
4006  MangledName);
4007  if (Var->isWeakForLinker())
4008  Var->setComdat(CGM.getModule().getOrInsertComdat(Var->getName()));
4009  return llvm::ConstantExpr::getBitCast(Var, CGM.Int8PtrTy);
4010 }
4011 
4012 /// Gets or a creates a Microsoft CompleteObjectLocator.
4013 llvm::GlobalVariable *
4014 MicrosoftCXXABI::getMSCompleteObjectLocator(const CXXRecordDecl *RD,
4015  const VPtrInfo &Info) {
4016  return MSRTTIBuilder(*this, RD).getCompleteObjectLocator(Info);
4017 }
4018 
4019 void MicrosoftCXXABI::emitCXXStructor(GlobalDecl GD) {
4020  if (auto *ctor = dyn_cast<CXXConstructorDecl>(GD.getDecl())) {
4021  // There are no constructor variants, always emit the complete destructor.
4022  llvm::Function *Fn =
4024  CGM.maybeSetTrivialComdat(*ctor, *Fn);
4025  return;
4026  }
4027 
4028  auto *dtor = cast<CXXDestructorDecl>(GD.getDecl());
4029 
4030  // Emit the base destructor if the base and complete (vbase) destructors are
4031  // equivalent. This effectively implements -mconstructor-aliases as part of
4032  // the ABI.
4033  if (GD.getDtorType() == Dtor_Complete &&
4034  dtor->getParent()->getNumVBases() == 0)
4035  GD = GD.getWithDtorType(Dtor_Base);
4036 
4037  // The base destructor is equivalent to the base destructor of its
4038  // base class if there is exactly one non-virtual base class with a
4039  // non-trivial destructor, there are no fields with a non-trivial
4040  // destructor, and the body of the destructor is trivial.
4041  if (GD.getDtorType() == Dtor_Base && !CGM.TryEmitBaseDestructorAsAlias(dtor))
4042  return;
4043 
4044  llvm::Function *Fn = CGM.codegenCXXStructor(GD);
4045  if (Fn->isWeakForLinker())
4046  Fn->setComdat(CGM.getModule().getOrInsertComdat(Fn->getName()));
4047 }
4048 
4049 llvm::Function *
4050 MicrosoftCXXABI::getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
4051  CXXCtorType CT) {
4052  assert(CT == Ctor_CopyingClosure || CT == Ctor_DefaultClosure);
4053 
4054  // Calculate the mangled name.
4055  SmallString<256> ThunkName;
4056  llvm::raw_svector_ostream Out(ThunkName);
4057  getMangleContext().mangleName(GlobalDecl(CD, CT), Out);
4058 
4059  // If the thunk has been generated previously, just return it.
4060  if (llvm::GlobalValue *GV = CGM.getModule().getNamedValue(ThunkName))
4061  return cast<llvm::Function>(GV);
4062 
4063  // Create the llvm::Function.
4064  const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeMSCtorClosure(CD, CT);
4065  llvm::FunctionType *ThunkTy = CGM.getTypes().GetFunctionType(FnInfo);
4066  const CXXRecordDecl *RD = CD->getParent();
4067  QualType RecordTy = getContext().getRecordType(RD);
4068  llvm::Function *ThunkFn = llvm::Function::Create(
4069  ThunkTy, getLinkageForRTTI(RecordTy), ThunkName.str(), &CGM.getModule());
4070  ThunkFn->setCallingConv(static_cast<llvm::CallingConv::ID>(
4071  FnInfo.getEffectiveCallingConvention()));
4072  if (ThunkFn->isWeakForLinker())
4073  ThunkFn->setComdat(CGM.getModule().getOrInsertComdat(ThunkFn->getName()));
4074  bool IsCopy = CT == Ctor_CopyingClosure;
4075 
4076  // Start codegen.
4077  CodeGenFunction CGF(CGM);
4078  CGF.CurGD = GlobalDecl(CD, Ctor_Complete);
4079 
4080  // Build FunctionArgs.
4081  FunctionArgList FunctionArgs;
4082 
4083  // A constructor always starts with a 'this' pointer as its first argument.
4084  buildThisParam(CGF, FunctionArgs);
4085 
4086  // Following the 'this' pointer is a reference to the source object that we
4087  // are copying from.
4088  ImplicitParamDecl SrcParam(
4089  getContext(), /*DC=*/nullptr, SourceLocation(),
4090  &getContext().Idents.get("src"),
4091  getContext().getLValueReferenceType(RecordTy,
4092  /*SpelledAsLValue=*/true),
4094  if (IsCopy)
4095  FunctionArgs.push_back(&SrcParam);
4096 
4097  // Constructors for classes which utilize virtual bases have an additional
4098  // parameter which indicates whether or not it is being delegated to by a more
4099  // derived constructor.
4100  ImplicitParamDecl IsMostDerived(getContext(), /*DC=*/nullptr,
4101  SourceLocation(),
4102  &getContext().Idents.get("is_most_derived"),
4103  getContext().IntTy, ImplicitParamDecl::Other);
4104  // Only add the parameter to the list if the class has virtual bases.
4105  if (RD->getNumVBases() > 0)
4106  FunctionArgs.push_back(&IsMostDerived);
4107 
4108  // Start defining the function.
4109  auto NL = ApplyDebugLocation::CreateEmpty(CGF);
4110  CGF.StartFunction(GlobalDecl(), FnInfo.getReturnType(), ThunkFn, FnInfo,
4111  FunctionArgs, CD->getLocation(), SourceLocation());
4112  // Create a scope with an artificial location for the body of this function.
4113  auto AL = ApplyDebugLocation::CreateArtificial(CGF);
4114  setCXXABIThisValue(CGF, loadIncomingCXXThis(CGF));
4115  llvm::Value *This = getThisValue(CGF);
4116 
4117  llvm::Value *SrcVal =
4118  IsCopy ? CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(&SrcParam), "src")
4119  : nullptr;
4120 
4121  CallArgList Args;
4122 
4123  // Push the this ptr.
4124  Args.add(RValue::get(This), CD->getThisType());
4125 
4126  // Push the src ptr.
4127  if (SrcVal)
4128  Args.add(RValue::get(SrcVal), SrcParam.getType());
4129 
4130  // Add the rest of the default arguments.
4132  ArrayRef<ParmVarDecl *> params = CD->parameters().drop_front(IsCopy ? 1 : 0);
4133  for (const ParmVarDecl *PD : params) {
4134  assert(PD->hasDefaultArg() && "ctor closure lacks default args");
4135  ArgVec.push_back(PD->getDefaultArg());
4136  }
4137 
4138  CodeGenFunction::RunCleanupsScope Cleanups(CGF);
4139 
4140  const auto *FPT = CD->getType()->castAs<FunctionProtoType>();
4141  CGF.EmitCallArgs(Args, FPT, llvm::makeArrayRef(ArgVec), CD, IsCopy ? 1 : 0);
4142 
4143  // Insert any ABI-specific implicit constructor arguments.
4144  AddedStructorArgCounts ExtraArgs =
4145  addImplicitConstructorArgs(CGF, CD, Ctor_Complete,
4146  /*ForVirtualBase=*/false,
4147  /*Delegating=*/false, Args);
4148  // Call the destructor with our arguments.
4149  llvm::Constant *CalleePtr =
4151  CGCallee Callee =
4152  CGCallee::forDirect(CalleePtr, GlobalDecl(CD, Ctor_Complete));
4153  const CGFunctionInfo &CalleeInfo = CGM.getTypes().arrangeCXXConstructorCall(
4154  Args, CD, Ctor_Complete, ExtraArgs.Prefix, ExtraArgs.Suffix);
4155  CGF.EmitCall(CalleeInfo, Callee, ReturnValueSlot(), Args);
4156 
4157  Cleanups.ForceCleanup();
4158 
4159  // Emit the ret instruction, remove any temporary instructions created for the
4160  // aid of CodeGen.
4162 
4163  return ThunkFn;
4164 }
4165 
4166 llvm::Constant *MicrosoftCXXABI::getCatchableType(QualType T,
4167  uint32_t NVOffset,
4168  int32_t VBPtrOffset,
4169  uint32_t VBIndex) {
4170  assert(!T->isReferenceType());
4171 
4172  CXXRecordDecl *RD = T->getAsCXXRecordDecl();
4173  const CXXConstructorDecl *CD =
4174  RD ? CGM.getContext().getCopyConstructorForExceptionObject(RD) : nullptr;
4176  if (CD)
4177  if (!hasDefaultCXXMethodCC(getContext(), CD) || CD->getNumParams() != 1)
4178  CT = Ctor_CopyingClosure;
4179 
4180  uint32_t Size = getContext().getTypeSizeInChars(T).getQuantity();
4181  SmallString<256> MangledName;
4182  {
4183  llvm::raw_svector_ostream Out(MangledName);
4184  getMangleContext().mangleCXXCatchableType(T, CD, CT, Size, NVOffset,
4185  VBPtrOffset, VBIndex, Out);
4186  }
4187  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
4188  return getImageRelativeConstant(GV);
4189 
4190  // The TypeDescriptor is used by the runtime to determine if a catch handler
4191  // is appropriate for the exception object.
4192  llvm::Constant *TD = getImageRelativeConstant(getAddrOfRTTIDescriptor(T));
4193 
4194  // The runtime is responsible for calling the copy constructor if the
4195  // exception is caught by value.
4196  llvm::Constant *CopyCtor;
4197  if (CD) {
4198  if (CT == Ctor_CopyingClosure)
4199  CopyCtor = getAddrOfCXXCtorClosure(CD, Ctor_CopyingClosure);
4200  else
4201  CopyCtor = CGM.getAddrOfCXXStructor(GlobalDecl(CD, Ctor_Complete));
4202 
4203  CopyCtor = llvm::ConstantExpr::getBitCast(CopyCtor, CGM.Int8PtrTy);
4204  } else {
4205  CopyCtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
4206  }
4207  CopyCtor = getImageRelativeConstant(CopyCtor);
4208 
4209  bool IsScalar = !RD;
4210  bool HasVirtualBases = false;
4211  bool IsStdBadAlloc = false; // std::bad_alloc is special for some reason.
4212  QualType PointeeType = T;
4213  if (T->isPointerType())
4214  PointeeType = T->getPointeeType();
4215  if (const CXXRecordDecl *RD = PointeeType->getAsCXXRecordDecl()) {
4216  HasVirtualBases = RD->getNumVBases() > 0;
4217  if (IdentifierInfo *II = RD->getIdentifier())
4218  IsStdBadAlloc = II->isStr("bad_alloc") && RD->isInStdNamespace();
4219  }
4220 
4221  // Encode the relevant CatchableType properties into the Flags bitfield.
4222  // FIXME: Figure out how bits 2 or 8 can get set.
4223  uint32_t Flags = 0;
4224  if (IsScalar)
4225  Flags |= 1;
4226  if (HasVirtualBases)
4227  Flags |= 4;
4228  if (IsStdBadAlloc)
4229  Flags |= 16;
4230 
4231  llvm::Constant *Fields[] = {
4232  llvm::ConstantInt::get(CGM.IntTy, Flags), // Flags
4233  TD, // TypeDescriptor
4234  llvm::ConstantInt::get(CGM.IntTy, NVOffset), // NonVirtualAdjustment
4235  llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset), // OffsetToVBPtr
4236  llvm::ConstantInt::get(CGM.IntTy, VBIndex), // VBTableIndex
4237  llvm::ConstantInt::get(CGM.IntTy, Size), // Size
4238  CopyCtor // CopyCtor
4239  };
4240  llvm::StructType *CTType = getCatchableTypeType();
4241  auto *GV = new llvm::GlobalVariable(
4242  CGM.getModule(), CTType, /*isConstant=*/true, getLinkageForRTTI(T),
4243  llvm::ConstantStruct::get(CTType, Fields), MangledName);
4244  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4245  GV->setSection(".xdata");
4246  if (GV->isWeakForLinker())
4247  GV->setComdat(CGM.getModule().getOrInsertComdat(GV->getName()));
4248  return getImageRelativeConstant(GV);
4249 }
4250 
4251 llvm::GlobalVariable *MicrosoftCXXABI::getCatchableTypeArray(QualType T) {
4252  assert(!T->isReferenceType());
4253 
4254  // See if we've already generated a CatchableTypeArray for this type before.
4255  llvm::GlobalVariable *&CTA = CatchableTypeArrays[T];
4256  if (CTA)
4257  return CTA;
4258 
4259  // Ensure that we don't have duplicate entries in our CatchableTypeArray by
4260  // using a SmallSetVector. Duplicates may arise due to virtual bases
4261  // occurring more than once in the hierarchy.
4263 
4264  // C++14 [except.handle]p3:
4265  // A handler is a match for an exception object of type E if [...]
4266  // - the handler is of type cv T or cv T& and T is an unambiguous public
4267  // base class of E, or
4268  // - the handler is of type cv T or const T& where T is a pointer type and
4269  // E is a pointer type that can be converted to T by [...]
4270  // - a standard pointer conversion (4.10) not involving conversions to
4271  // pointers to private or protected or ambiguous classes
4272  const CXXRecordDecl *MostDerivedClass = nullptr;
4273  bool IsPointer = T->isPointerType();
4274  if (IsPointer)
4275  MostDerivedClass = T->getPointeeType()->getAsCXXRecordDecl();
4276  else
4277  MostDerivedClass = T->getAsCXXRecordDecl();
4278 
4279  // Collect all the unambiguous public bases of the MostDerivedClass.
4280  if (MostDerivedClass) {
4281  const ASTContext &Context = getContext();
4282  const ASTRecordLayout &MostDerivedLayout =
4283  Context.getASTRecordLayout(MostDerivedClass);
4284  MicrosoftVTableContext &VTableContext = CGM.getMicrosoftVTableContext();
4286  serializeClassHierarchy(Classes, MostDerivedClass);
4287  Classes.front().initialize(/*Parent=*/nullptr, /*Specifier=*/nullptr);
4288  detectAmbiguousBases(Classes);
4289  for (const MSRTTIClass &Class : Classes) {
4290  // Skip any ambiguous or private bases.
4291  if (Class.Flags &
4292  (MSRTTIClass::IsPrivateOnPath | MSRTTIClass::IsAmbiguous))
4293  continue;
4294  // Write down how to convert from a derived pointer to a base pointer.
4295  uint32_t OffsetInVBTable = 0;
4296  int32_t VBPtrOffset = -1;
4297  if (Class.VirtualRoot) {
4298  OffsetInVBTable =
4299  VTableContext.getVBTableIndex(MostDerivedClass, Class.VirtualRoot)*4;
4300  VBPtrOffset = MostDerivedLayout.getVBPtrOffset().getQuantity();
4301  }
4302 
4303  // Turn our record back into a pointer if the exception object is a
4304  // pointer.
4305  QualType RTTITy = QualType(Class.RD->getTypeForDecl(), 0);
4306  if (IsPointer)
4307  RTTITy = Context.getPointerType(RTTITy);
4308  CatchableTypes.insert(getCatchableType(RTTITy, Class.OffsetInVBase,
4309  VBPtrOffset, OffsetInVBTable));
4310  }
4311  }
4312 
4313  // C++14 [except.handle]p3:
4314  // A handler is a match for an exception object of type E if
4315  // - The handler is of type cv T or cv T& and E and T are the same type
4316  // (ignoring the top-level cv-qualifiers)
4317  CatchableTypes.insert(getCatchableType(T));
4318 
4319  // C++14 [except.handle]p3:
4320  // A handler is a match for an exception object of type E if
4321  // - the handler is of type cv T or const T& where T is a pointer type and
4322  // E is a pointer type that can be converted to T by [...]
4323  // - a standard pointer conversion (4.10) not involving conversions to
4324  // pointers to private or protected or ambiguous classes
4325  //
4326  // C++14 [conv.ptr]p2:
4327  // A prvalue of type "pointer to cv T," where T is an object type, can be
4328  // converted to a prvalue of type "pointer to cv void".
4329  if (IsPointer && T->getPointeeType()->isObjectType())
4330  CatchableTypes.insert(getCatchableType(getContext().VoidPtrTy));
4331 
4332  // C++14 [except.handle]p3:
4333  // A handler is a match for an exception object of type E if [...]
4334  // - the handler is of type cv T or const T& where T is a pointer or
4335  // pointer to member type and E is std::nullptr_t.
4336  //
4337  // We cannot possibly list all possible pointer types here, making this
4338  // implementation incompatible with the standard. However, MSVC includes an
4339  // entry for pointer-to-void in this case. Let's do the same.
4340  if (T->isNullPtrType())
4341  CatchableTypes.insert(getCatchableType(getContext().VoidPtrTy));
4342 
4343  uint32_t NumEntries = CatchableTypes.size();
4344  llvm::Type *CTType =
4345  getImageRelativeType(getCatchableTypeType()->getPointerTo());
4346  llvm::ArrayType *AT = llvm::ArrayType::get(CTType, NumEntries);
4347  llvm::StructType *CTAType = getCatchableTypeArrayType(NumEntries);
4348  llvm::Constant *Fields[] = {
4349  llvm::ConstantInt::get(CGM.IntTy, NumEntries), // NumEntries
4350  llvm::ConstantArray::get(
4351  AT, llvm::makeArrayRef(CatchableTypes.begin(),
4352  CatchableTypes.end())) // CatchableTypes
4353  };
4354  SmallString<256> MangledName;
4355  {
4356  llvm::raw_svector_ostream Out(MangledName);
4357  getMangleContext().mangleCXXCatchableTypeArray(T, NumEntries, Out);
4358  }
4359  CTA = new llvm::GlobalVariable(
4360  CGM.getModule(), CTAType, /*isConstant=*/true, getLinkageForRTTI(T),
4361  llvm::ConstantStruct::get(CTAType, Fields), MangledName);
4362  CTA->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4363  CTA->setSection(".xdata");
4364  if (CTA->isWeakForLinker())
4365  CTA->setComdat(CGM.getModule().getOrInsertComdat(CTA->getName()));
4366  return CTA;
4367 }
4368 
4369 llvm::GlobalVariable *MicrosoftCXXABI::getThrowInfo(QualType T) {
4370  bool IsConst, IsVolatile, IsUnaligned;
4371  T = decomposeTypeForEH(getContext(), T, IsConst, IsVolatile, IsUnaligned);
4372 
4373  // The CatchableTypeArray enumerates the various (CV-unqualified) types that
4374  // the exception object may be caught as.
4375  llvm::GlobalVariable *CTA = getCatchableTypeArray(T);
4376  // The first field in a CatchableTypeArray is the number of CatchableTypes.
4377  // This is used as a component of the mangled name which means that we need to
4378  // know what it is in order to see if we have previously generated the
4379  // ThrowInfo.
4380  uint32_t NumEntries =
4381  cast<llvm::ConstantInt>(CTA->getInitializer()->getAggregateElement(0U))
4382  ->getLimitedValue();
4383 
4384  SmallString<256> MangledName;
4385  {
4386  llvm::raw_svector_ostream Out(MangledName);
4387  getMangleContext().mangleCXXThrowInfo(T, IsConst, IsVolatile, IsUnaligned,
4388  NumEntries, Out);
4389  }
4390 
4391  // Reuse a previously generated ThrowInfo if we have generated an appropriate
4392  // one before.
4393  if (llvm::GlobalVariable *GV = CGM.getModule().getNamedGlobal(MangledName))
4394  return GV;
4395 
4396  // The RTTI TypeDescriptor uses an unqualified type but catch clauses must
4397  // be at least as CV qualified. Encode this requirement into the Flags
4398  // bitfield.
4399  uint32_t Flags = 0;
4400  if (IsConst)
4401  Flags |= 1;
4402  if (IsVolatile)
4403  Flags |= 2;
4404  if (IsUnaligned)
4405  Flags |= 4;
4406 
4407  // The cleanup-function (a destructor) must be called when the exception
4408  // object's lifetime ends.
4409  llvm::Constant *CleanupFn = llvm::Constant::getNullValue(CGM.Int8PtrTy);
4410  if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
4411  if (CXXDestructorDecl *DtorD = RD->getDestructor())
4412  if (!DtorD->isTrivial())
4413  CleanupFn = llvm::ConstantExpr::getBitCast(
4415  CGM.Int8PtrTy);
4416  // This is unused as far as we can tell, initialize it to null.
4417  llvm::Constant *ForwardCompat =
4418  getImageRelativeConstant(llvm::Constant::getNullValue(CGM.Int8PtrTy));
4419  llvm::Constant *PointerToCatchableTypes = getImageRelativeConstant(
4420  llvm::ConstantExpr::getBitCast(CTA, CGM.Int8PtrTy));
4421  llvm::StructType *TIType = getThrowInfoType();
4422  llvm::Constant *Fields[] = {
4423  llvm::ConstantInt::get(CGM.IntTy, Flags), // Flags
4424  getImageRelativeConstant(CleanupFn), // CleanupFn
4425  ForwardCompat, // ForwardCompat
4426  PointerToCatchableTypes // CatchableTypeArray
4427  };
4428  auto *GV = new llvm::GlobalVariable(
4429  CGM.getModule(), TIType, /*isConstant=*/true, getLinkageForRTTI(T),
4430  llvm::ConstantStruct::get(TIType, Fields), MangledName.str());
4431  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4432  GV->setSection(".xdata");
4433  if (GV->isWeakForLinker())
4434  GV->setComdat(CGM.getModule().getOrInsertComdat(GV->getName()));
4435  return GV;
4436 }
4437 
4438 void MicrosoftCXXABI::emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) {
4439  const Expr *SubExpr = E->getSubExpr();
4440  assert(SubExpr && "SubExpr cannot be null");
4441  QualType ThrowType = SubExpr->getType();
4442  // The exception object lives on the stack and it's address is passed to the
4443  // runtime function.
4444  Address AI = CGF.CreateMemTemp(ThrowType);
4445  CGF.EmitAnyExprToMem(SubExpr, AI, ThrowType.getQualifiers(),
4446  /*IsInit=*/true);
4447 
4448  // The so-called ThrowInfo is used to describe how the exception object may be
4449  // caught.
4450  llvm::GlobalVariable *TI = getThrowInfo(ThrowType);
4451 
4452  // Call into the runtime to throw the exception.
4453  llvm::Value *Args[] = {
4454  CGF.Builder.CreateBitCast(AI.getPointer(), CGM.Int8PtrTy),
4455  TI
4456  };
4458 }
4459 
4460 std::pair<llvm::Value *, const CXXRecordDecl *>
4461 MicrosoftCXXABI::LoadVTablePtr(CodeGenFunction &CGF, Address This,
4462  const CXXRecordDecl *RD) {
4463  std::tie(This, std::ignore, RD) =
4464  performBaseAdjustment(CGF, This, QualType(RD->getTypeForDecl(), 0));
4465  return {CGF.GetVTablePtr(This, CGM.Int8PtrTy, RD), RD};
4466 }
4467 
4468 bool MicrosoftCXXABI::isPermittedToBeHomogeneousAggregate(
4469  const CXXRecordDecl *CXXRD) const {
4470  // MSVC Windows on Arm64 considers a type not HFA if it is not an
4471  // aggregate according to the C++14 spec. This is not consistent with the
4472  // AAPCS64, but is defacto spec on that platform.
4473  return !CGM.getTarget().getTriple().isAArch64() ||
4474  isTrivialForAArch64MSVC(CXXRD);
4475 }
clang::CXXMethodDecl::getThisType
QualType getThisType() const
Return the type of the this pointer.
Definition: DeclCXX.cpp:2452
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:208
clang::ASTContext::getTypeSizeInChars
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
Definition: ASTContext.cpp:2462
clang::GlobalDecl::getDtorType
CXXDtorType getDtorType() const
Definition: GlobalDecl.h:110
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
emitTlsGuardCheck
static void emitTlsGuardCheck(CodeGenFunction &CGF, llvm::GlobalValue *TlsGuard, llvm::BasicBlock *DynInitBB, llvm::BasicBlock *ContinueBB)
Definition: MicrosoftCXXABI.cpp:2432
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::GetAddrOfGlobalVar
llvm::Constant * GetAddrOfGlobalVar(const VarDecl *D, llvm::Type *Ty=nullptr, ForDefinition_t IsForDefinition=NotForDefinition)
Return the llvm::Constant for the address of the given global variable.
Definition: CodeGenModule.cpp:4360
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
YAML serialization mapping.
Definition: Dominators.h:30
clang::CXXConstructorDecl
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2421
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:1569
clang::CodeGen::ConstantAddress
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:140
clang::FunctionDecl::getNumParams
unsigned getNumParams() const
Return the number of parameters this function must have based on its FunctionType.
Definition: Decl.cpp:3442
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:396
mangleVFTableName
static void mangleVFTableName(MicrosoftMangleContext &MangleContext, const CXXRecordDecl *RD, const VPtrInfo &VFPtr, SmallString< 256 > &Name)
Definition: MicrosoftCXXABI.cpp:1758
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:2072
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:4025
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::ReturnAdjustment::VirtualAdjustment::Microsoft
struct clang::ReturnAdjustment::VirtualAdjustment::@179 Microsoft
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:4683
Ret
static bool Ret(InterpState &S, CodePtr &PC, APValue &Result)
Definition: Interp.cpp:34
isTrivialForAArch64MSVC
static bool isTrivialForAArch64MSVC(const CXXRecordDecl *RD)
Definition: MicrosoftCXXABI.cpp:1085
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:389
getInitThreadAbortFn
static llvm::FunctionCallee getInitThreadAbortFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2534
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:542
clang::CodeGen::CodeGenFunction::CurCodeDecl
const Decl * CurCodeDecl
CurCodeDecl - This is the inner-most code context, which includes blocks.
Definition: CodeGenFunction.h:322
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:2340
clang::QualType::isConstQualified
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6559
clang::CodeGen::CodeGenFunction::EmitNounwindRuntimeCall
llvm::CallInst * EmitNounwindRuntimeCall(llvm::FunctionCallee callee, const Twine &name="")
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:3937
clang::GlobalDecl::getWithCtorType
GlobalDecl getWithCtorType(CXXCtorType Type)
Definition: GlobalDecl.h:169
clang::NamedDecl::isExternallyVisible
bool isExternallyVisible() const
Definition: Decl.h:405
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:596
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6527
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:111
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:247
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:815
clang::CodeGen::CGCXXABI::AddedStructorArgs
Additional implicit arguments to add to the beginning (Prefix) and end (Suffix) of a constructor / de...
Definition: CGCXXABI.h:313
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:659
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3525
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:675
clang::TypeDecl::getTypeForDecl
const Type * getTypeForDecl() const
Definition: Decl.h:3182
Attr.h
clang::CXXRecordDecl::hasNonTrivialCopyAssignment
bool hasNonTrivialCopyAssignment() const
Determine whether this class has a non-trivial copy assignment operator (C++ [class....
Definition: DeclCXX.h:1289
AttributeLangSupport::C
@ C
Definition: SemaDeclAttr.cpp:55
clang::DynamicInitKind::Initializer
@ Initializer
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:174
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:697
isDeletingDtor
static bool isDeletingDtor(GlobalDecl GD)
Definition: MicrosoftCXXABI.cpp:1076
clang::FieldDecl
Represents a member of a struct/union/class.
Definition: Decl.h:2855
clang::DiagnosticsEngine
Concrete class used by the front-end to report problems and issues.
Definition: Diagnostic.h:192
clang::ParmVarDecl
Represents a parameter to a function.
Definition: Decl.h:1680
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:2430
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:97
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:4496
llvm::SmallPtrSet
Definition: ASTContext.h:82
clang::MemberPointerType::isMemberFunctionPointer
bool isMemberFunctionPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2864
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:6570
clang::CodeGen::CGFunctionInfo::getEffectiveCallingConvention
unsigned getEffectiveCallingConvention() const
getEffectiveCallingConvention - Return the actual calling convention to use, which may depend on the ...
Definition: CGFunctionInfo.h:692
clang::CodeGen::CodeGenModule::CreateGlobalInitOrCleanUpFunction
llvm::Function * CreateGlobalInitOrCleanUpFunction(llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI, SourceLocation Loc=SourceLocation(), bool TLS=false, llvm::GlobalVariable::LinkageTypes Linkage=llvm::GlobalVariable::InternalLinkage)
Definition: CGDeclCXX.cpp:426
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:44
clang::CodeGen::CodeGenModule::computeNonVirtualBaseClassOffset
CharUnits computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass, CastExpr::path_const_iterator Start, CastExpr::path_const_iterator End)
Definition: CGClass.cpp:169
clang::CodeGen::CGFunctionInfo::getReturnType
CanQualType getReturnType() const
Definition: CGFunctionInfo.h:709
clang::CodeGen::CallArgList::add
void add(RValue rvalue, QualType type)
Definition: CGCall.h:286
getInitThreadFooterFn
static llvm::FunctionCallee getInitThreadFooterFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2522
clang::CodeGen::CodeGenFunction::Builder
CGBuilderTy Builder
Definition: CodeGenFunction.h:269
clang::APValue::getMemberPointerDecl
const ValueDecl * getMemberPointerDecl() const
Definition: APValue.cpp:1045
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:1469
clang::FunctionProtoType::isVariadic
bool isVariadic() const
Whether this function prototype is variadic.
Definition: Type.h:4230
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1500
clang::CodeGen::CodeGenTypeCache::VoidPtrTy
llvm::PointerType * VoidPtrTy
Definition: CodeGenTypeCache.h:56
getTlsGuardVar
static llvm::GlobalValue * getTlsGuardVar(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2403
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:2692
Decl.h
clang::CodeGen::CodeGenFunction::GetAddrOfLocalVar
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
Definition: CodeGenFunction.h:2720
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:2553
clang::CodeGen::CodeGenFunction::EmitCXXDestructorCall
void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, bool ForVirtualBase, bool Delegating, Address This, QualType ThisTy)
Definition: CGClass.cpp:2465
clang::CodeGen::CodeGenModule::GetGlobalValue
llvm::GlobalValue * GetGlobalValue(StringRef Ref)
Definition: CodeGenModule.cpp:1552
clang::GlobalDecl
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:56
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:2843
clang::CodeGen::AlignmentSource::Decl
@ Decl
The l-value was an access to a declared entity or something equivalently strong, like the address of ...
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:2471
classifyReturnType
static bool classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI, const ABIInfo &Info)
Definition: TargetInfo.cpp:181
U
clang::CodeGen::CodeGenTypes::ConvertTypeForMem
llvm::Type * ConvertTypeForMem(QualType T, bool ForBitField=false)
ConvertTypeForMem - Convert type T into a llvm::Type.
Definition: CodeGenTypes.cpp:91
clang::CodeGen::ReturnValueSlot
ReturnValueSlot - Contains the address where the return value of a function can be stored,...
Definition: CGCall.h:360
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:178
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6760
V
#define V(N, I)
Definition: ASTContext.h:3176
clang::ast_matchers::expr
const internal::VariadicDynCastAllOfMatcher< Stmt, Expr > expr
Matches expressions.
Definition: ASTMatchersInternal.cpp:890
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:872
clang::GlobalDecl::getWithDtorType
GlobalDecl getWithDtorType(CXXDtorType Type)
Definition: GlobalDecl.h:176
clang::CodeGen::CodeGenFunction::VPtr::NearestVBase
const CXXRecordDecl * NearestVBase
Definition: CodeGenFunction.h:2268
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
clang::CodeGen::CodeGenFunction::EmitVTableTypeCheckedLoad
llvm::Value * EmitVTableTypeCheckedLoad(const CXXRecordDecl *RD, llvm::Value *VTable, llvm::Type *VTableTy, uint64_t VTableByteOffset)
Emit a type checked load from the given vtable.
Definition: CGClass.cpp:2860
getTypeInfoVTable
static llvm::GlobalVariable * getTypeInfoVTable(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:3576
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:1995
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:11598
clang::VarDecl::isStaticLocal
bool isStaticLocal() const
Returns true if a variable with function scope is a static local variable.
Definition: Decl.h:1123
clang::Type::isNullPtrType
bool isNullPtrType() const
Definition: Type.h:7062
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:3054
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:208
clang::ASTContext::getSizeType
CanQualType getSizeType() const
Return the unique type for "size_t" (C99 7.17), defined in <stddef.h>.
Definition: ASTContext.cpp:5823
clang::CodeGen::CodeGenModule::maybeSetTrivialComdat
void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO)
Definition: CodeGenModule.cpp:4554
clang::CXXDtorType
CXXDtorType
C++ destructor types.
Definition: ABI.h:33
clang::MemberPointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2860
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:3757
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:7243
clang::DiagnosticsEngine::Error
@ Error
Definition: Diagnostic.h:200
clang::CodeGen::CGCXXABI::RecordArgABI
RecordArgABI
Specify how one should pass an argument of a record type.
Definition: CGCXXABI.h:142
clang::CXXRecordDecl::getNumBases
unsigned getNumBases() const
Retrieves the number of base classes of this class.
Definition: DeclCXX.h:590
clang::UniqueExternalLinkage
@ UniqueExternalLinkage
External linkage within a unique namespace.
Definition: Linkage.h:40
clang::TypeInfo::isAlignRequired
bool isAlignRequired()
Definition: ASTContext.h:187
clang::CastExpr::path_begin
path_iterator path_begin()
Definition: Expr.h:3545
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:3765
clang::CXXRecordDecl::ctors
ctor_range ctors() const
Definition: DeclCXX.h:658
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::CharUnits::One
static CharUnits One()
One - Construct a CharUnits quantity of one.
Definition: CharUnits.h:58
clang::CodeGen::CodeGenModule::getModule
llvm::Module & getModule() const
Definition: CodeGenModule.h:704
clang::index::SymbolKind::Field
@ Field
clang::CXXDestructorDecl
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2688
clang::CodeGen::CodeGenTypeCache::getIntSize
CharUnits getIntSize() const
Definition: CodeGenTypeCache.h:84
clang::ImplicitParamDecl
Definition: Decl.h:1613
clang::CXXRecordDecl::isPOD
bool isPOD() const
Whether this class is a POD-type (C++ [class]p4)
Definition: DeclCXX.h:1133
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:874
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:321
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:2454
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:2642
clang::CodeGen::CodeGenModule::getTypes
CodeGenTypes & getTypes()
Definition: CodeGenModule.h:721
clang::ReturnAdjustment
A return adjustment.
Definition: Thunk.h:26
clang::dataflow::var
static constexpr Variable var(Literal L)
Returns the variable of L.
Definition: WatchedLiteralsSolver.cpp:71
llvm::DenseSet
Definition: Sema.h:77
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:1759
emitRTtypeidCall
static llvm::CallBase * emitRTtypeidCall(CodeGenFunction &CGF, llvm::Value *Argument)
Definition: MicrosoftCXXABI.cpp:962
clang::CXXRecordDecl::bases
base_class_range bases()
Definition: DeclCXX.h:596
clang::MemberPointerType::isMemberDataPointer
bool isMemberDataPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2870
clang::CodeGen::CodeGenFunction::EmitAutoVarAlloca
AutoVarEmission EmitAutoVarAlloca(const VarDecl &var)
EmitAutoVarAlloca - Emit the alloca and debug information for a local variable.
Definition: CGDecl.cpp:1424
clang::CodeGen::CodeGenFunction::getLLVMContext
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenFunction.h:2025
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:274
clang::CodeGen::CodeGenFunction::getContext
ASTContext & getContext() const
Definition: CodeGenFunction.h:1982
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:325
clang::CodeGen::Address
An aligned address.
Definition: Address.h:74
Base
CodeGenModule.h
emitGlobalDtorWithTLRegDtor
static void emitGlobalDtorWithTLRegDtor(CodeGenFunction &CGF, const VarDecl &VD, llvm::FunctionCallee Dtor, llvm::Constant *Addr)
Definition: MicrosoftCXXABI.cpp:2319
clang::CodeGen::CGBuilderTy::CreateGEP
Address CreateGEP(Address Addr, llvm::Value *Index, const llvm::Twine &Name="")
Definition: CGBuilder.h:261
clang::CodeGen::CodeGenModule::AppendLinkerOptions
void AppendLinkerOptions(StringRef Opts)
Appends Opts to the "llvm.linker.options" metadata value.
Definition: CodeGenModule.cpp:2392
clang::Qualifiers::hasUnaligned
bool hasUnaligned() const
Definition: Type.h:303
clang::CXXRecordDecl::getMSInheritanceModel
MSInheritanceModel getMSInheritanceModel() const
Returns the inheritance model used for this record.
Definition: MicrosoftCXXABI.cpp:234
clang::CXXRecordDecl::vbases
base_class_range vbases()
Definition: DeclCXX.h:613
clang::CastExpr::getCastKind
CastKind getCastKind() const
Definition: Expr.h:3519
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:241
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:834
clang::CodeGen::CGCallee::forDirect
static CGCallee forDirect(llvm::Constant *functionPtr, const CGCalleeInfo &abstractInfo=CGCalleeInfo())
Definition: CGCall.h:133
clang::CodeGen::CodeGenModule::getTarget
const TargetInfo & getTarget() const
Definition: CodeGenModule.h:709
clang::QualType::getUnqualifiedType
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6580
clang::CodeGen::CodeGenFunction::CurGD
GlobalDecl CurGD
CurGD - The GlobalDecl for the current function being compiled.
Definition: CodeGenFunction.h:345
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:1774
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:2708
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:2634
clang::ASTContext::getExceptionObjectType
QualType getExceptionObjectType(QualType T) const
Definition: ASTContext.cpp:6748
clang::CodeGen::CodeGenTypes::GetFunctionType
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1609
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7310
clang::TargetInfo::getTriple
const llvm::Triple & getTriple() const
Returns the target triple of the primary target.
Definition: TargetInfo.h:1160
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:709
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:254
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:260
clang::CodeGen::LValue
LValue - This represents an lvalue references.
Definition: CGValue.h:171
clang::inheritanceModelHasNVOffsetField
bool inheritanceModelHasNVOffsetField(bool IsMemberFunction, MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:371
clang::CodeGen::CodeGenFunction::EHStack
EHScopeStack EHStack
Definition: CodeGenFunction.h:619
clang::CodeGen::CodeGenModule::getMicrosoftVTableContext
MicrosoftVTableContext & getMicrosoftVTableContext()
Definition: CodeGenModule.h:729
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:2496
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:301
clang::CastExpr::path_const_iterator
const typedef CXXBaseSpecifier *const * path_const_iterator
Definition: Expr.h:3542
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6748
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:240
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:233
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:611
clang::CodeGen::Address::getPointer
llvm::Value * getPointer() const
Definition: Address.h:93
clang::CodeGen::CodeGenFunction
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Definition: CodeGenFunction.h:231
clang::ASTContext::getDeclAlign
CharUnits getDeclAlign(const Decl *D, bool ForAlignof=false) const
Return a conservative estimate of the alignment of the specified decl D.
Definition: ASTContext.cpp:1727
clang::NamedDecl::getIdentifier
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:268
clang::ValueDecl
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:674
clang::ASTContext::IntTy
CanQualType IntTy
Definition: ASTContext.h:1105
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::CodeGen::CodeGenModule::CreateRuntimeVariable
llvm::Constant * CreateRuntimeVariable(llvm::Type *Ty, StringRef Name)
Create a new runtime global variable with the specified type and name.
Definition: CodeGenModule.cpp:4376
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3898
clang::ASTContext::getFieldOffset
uint64_t getFieldOffset(const ValueDecl *FD) const
Get the offset of a FieldDecl or IndirectFieldDecl, in bits.
Definition: RecordLayoutBuilder.cpp:3411
clang::ASTContext::Idents
IdentifierTable & Idents
Definition: ASTContext.h:655
clang::CodeGen::CGCXXABI::AddedStructorArgCounts
Similar to AddedStructorArgs, but only notes the number of additional arguments.
Definition: CGCXXABI.h:333
clang::DeclContext::getParent
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1876
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:247
clang::CXXRecordDecl::hasPrivateFields
bool hasPrivateFields() const
Definition: DeclCXX.h:1153
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:275
clang::CXXDeleteExpr
Represents a delete expression for memory deallocation and destructor calls, e.g.
Definition: ExprCXX.h:2415
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:740
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:6564
llvm::ArrayRef
Definition: LLVM.h:34
Value
Value
Definition: UninitializedValues.cpp:102
clang::CastExpr::path_end
path_iterator path_end()
Definition: Expr.h:3546
getDynTlsOnDemandInitFn
static llvm::FunctionCallee getDynTlsOnDemandInitFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2418
clang::CodeGen::CGBuilderTy::CreateAlignedLoad
llvm::LoadInst * CreateAlignedLoad(llvm::Type *Ty, llvm::Value *Addr, CharUnits Align, const llvm::Twine &Name="")
Definition: CGBuilder.h:87
clang::CodeGen::CGCallee
All available information about a concrete callee.
Definition: CGCall.h:63
clang::CodeGen::FunctionArgList
FunctionArgList - Type for representing both the decl and type of parameters to a function.
Definition: CGCall.h:356
clang::CXXThrowExpr::getSubExpr
const Expr * getSubExpr() const
Definition: ExprCXX.h:1201
CodeGenTypes.h
clang::CodeGen::CGFunctionInfo::getReturnInfo
ABIArgInfo & getReturnInfo()
Definition: CGFunctionInfo.h:711
clang::ThisAdjustment::VirtualAdjustment::Microsoft
struct clang::ThisAdjustment::VirtualAdjustment::@181 Microsoft
clang::inheritanceModelHasVBPtrOffsetField
bool inheritanceModelHasVBPtrOffsetField(MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:365
clang::CodeGen::CodeGenFunction::getTypes
CodeGenTypes & getTypes() const
Definition: CodeGenFunction.h:1981
clang::MicrosoftVTableContext
Definition: VTableBuilder.h:544
clang::CodeGen::CodeGenFunction::ConvertType
llvm::Type * ConvertType(QualType T)
Definition: CodeGenFunction.cpp:212
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:54
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::CodeGen::CodeGenFunction::MakeAddrLValue
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
Definition: CodeGenFunction.h:2492
clang::RecordDecl::canPassInRegisters
bool canPassInRegisters() const
Determine whether this class can be passed in registers.
Definition: Decl.h:4051
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:1273
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:165
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:4527
clang::MicrosoftVTableContext::getVBTableIndex
unsigned getVBTableIndex(const CXXRecordDecl *Derived, const CXXRecordDecl *VBase)
Returns the index of VBase in the vbtable of Derived.
Definition: VTableBuilder.cpp:3744
getRecordArgABI
static CGCXXABI::RecordArgABI getRecordArgABI(const RecordType *RT, CGCXXABI &CXXABI)
Definition: TargetInfo.cpp:162
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:3697
clang::CXXRecordDecl::getDestructor
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1888
clang::CodeGen::CGBuilderTy::CreateConstByteGEP
Address CreateConstByteGEP(Address Addr, CharUnits Offset, const llvm::Twine &Name="")
Definition: CGBuilder.h:282
clang::MSInheritanceModel::Virtual
@ Virtual
clang::MemberPointerType
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2844
decomposeTypeForEH
static QualType decomposeTypeForEH(ASTContext &Context, QualType T, bool &IsConst, bool &IsVolatile, bool &IsUnaligned)
Definition: MicrosoftCXXABI.cpp:3910
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:527
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:292
clang::inheritanceModelHasOnlyOneField
bool inheritanceModelHasOnlyOneField(bool IsMemberFunction, MSInheritanceModel Inheritance)
Definition: CXXInheritance.h:381
clang::CodeGen::CodeGenFunction::EmitCXXGlobalVarDeclInit
void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::GlobalVariable *GV, bool PerformInit)
EmitCXXGlobalVarDeclInit - Create the initializer for a C++ variable with global storage.
Definition: CGDeclCXX.cpp:175
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:549
clang::CodeGen::CodeGenFunction::CGM
CodeGenModule & CGM
Definition: CodeGenFunction.h:261
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:4950
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:867
clang::CodeGen::CodeGenFunction::CurFn
llvm::Function * CurFn
Definition: CodeGenFunction.h:325
clang::Builtin::ID
ID
Definition: Builtins.h:49
clang::MicrosoftVTableContext::getMethodVFTableLocation
MethodVFTableLocation getMethodVFTableLocation(GlobalDecl GD)
Definition: VTableBuilder.cpp:3775
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:3047
clang
Definition: CalledOnceCheck.h:17
clang::TypeInfo::Align
unsigned Align
Definition: ASTContext.h:180
clang::CodeGen::RValue::get
static RValue get(llvm::Value *V)
Definition: CGValue.h:89
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:4142
clang::ASTContext::toCharUnitsFromBits
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Definition: ASTContext.cpp:2451
emitDynamicTlsInitializationCall
static void emitDynamicTlsInitializationCall(CodeGenFunction &CGF, llvm::GlobalValue *TlsGuard, llvm::BasicBlock *ContinueBB)
Definition: MicrosoftCXXABI.cpp:2442
clang::CodeGen::ApplyDebugLocation::CreateArtificial
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:822
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:36
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:662
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:1942
clang::CodeGen::CodeGenFunction::EmitLoadOfReferenceLValue
LValue EmitLoadOfReferenceLValue(LValue RefLVal)
Definition: CGExpr.cpp:2562
clang::CodeGen::CGCallee::forVirtual
static CGCallee forVirtual(const CallExpr *CE, GlobalDecl MD, Address Addr, llvm::FunctionType *FTy)
Definition: CGCall.h:143
clang::Expr::getType
QualType getType() const
Definition: Expr.h:141
clang::CXXBaseSpecifier
Represents a base class of a C++ class.
Definition: DeclCXX.h:146
clang::CXXRecordDecl::hasDefinition
bool hasDefinition() const
Definition: DeclCXX.h:549
clang::NamedDecl::getDeclName
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:311
clang::CodeGen::RValue::getScalarVal
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:61
clang::CodeGen::CodeGenModule::getDiags
DiagnosticsEngine & getDiags() const
Definition: CodeGenModule.h:705
clang::CodeGen::ApplyDebugLocation::CreateEmpty
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:839
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:533
clang::APValue::getMemberPointerPath
ArrayRef< const CXXRecordDecl * > getMemberPointerPath() const
Definition: APValue.cpp:1059
clang::MSInheritanceModel
MSInheritanceModel
Assigned inheritance model for a class in the MS C++ ABI.
Definition: Specifiers.h:370
clang::CodeGen::ABIArgInfo::setSRetAfterThis
void setSRetAfterThis(bool AfterThis)
Definition: CGFunctionInfo.h:430
clang::CodeGen::CodeGenFunction::CurrentFuncletPad
llvm::Instruction * CurrentFuncletPad
Definition: CodeGenFunction.h:623
getInitThreadHeaderFn
static llvm::FunctionCallee getInitThreadHeaderFn(CodeGenModule &CGM)
Definition: MicrosoftCXXABI.cpp:2510
clang::CodeGen::CodeGenFunction::EmitAutoVarCleanups
void EmitAutoVarCleanups(const AutoVarEmission &emission)
Definition: CGDecl.cpp:2043
clang::CodeGen::CodeGenFunction::VPtr
Struct with all information about dynamic [sub]class needed to set vptr.
Definition: CodeGenFunction.h:2266
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:3268
clang::CodeGen::CodeGenVTables
Definition: CGVTables.h:32
clang::GlobalDecl::getDecl
const Decl * getDecl() const
Definition: GlobalDecl.h:103
clang::APValue::isMemberPointerToDerivedMember
bool isMemberPointerToDerivedMember() const
Definition: APValue.cpp:1052
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:1331
clang::QualType::getTypePtr
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6500
clang::CodeGen::CGCXXABI
Implements C++ ABI-specific code generation functions.
Definition: CGCXXABI.h:43
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:3260
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:1169
Parent
NodeId Parent
Definition: ASTDiff.cpp:192
clang::CodeGen::CatchRetScope
Definition: CGCXXABI.h:659
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:2440
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:4439
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: Randstruct.h:18
CGVTables.h
clang::ValueDecl::getType
QualType getType() const
Definition: Decl.h:685
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:217
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:1026
clang::CodeGen::CreateMicrosoftCXXABI
CGCXXABI * CreateMicrosoftCXXABI(CodeGenModule &CGM)
Creates a Microsoft-family ABI.
Definition: MicrosoftCXXABI.cpp:3542
hasDefaultCXXMethodCC
static bool hasDefaultCXXMethodCC(ASTContext &Context, const CXXMethodDecl *MD)
Definition: MicrosoftCXXABI.cpp:1243
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:1222
clang::CodeGen::CodeGenTypeCache::Int8Ty
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Definition: CodeGenTypeCache.h:37
clang::LangOptions::MSVC2019_5
@ MSVC2019_5
Definition: LangOptions.h:150
clang::CastExpr
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3475
clang::CXXRecordDecl::hasProtectedFields
bool hasProtectedFields() const
Definition: DeclCXX.h:1157
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:2503
clang::Decl::getLocation
SourceLocation getLocation() const
Definition: DeclBase.h:425
clang::CodeGen::CallArgList
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:262
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:399
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:1267
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:544
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:3059
clang::CodeGen::CodeGenModule::getLLVMContext
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenModule.h:715
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
emitDynamicTlsInitialization
static void emitDynamicTlsInitialization(CodeGenFunction &CGF)
Definition: MicrosoftCXXABI.cpp:2454
clang::Type::getLinkage
Linkage getLinkage() const
Determine the linkage of this type.
Definition: Type.cpp:3976
ConstantInitBuilder.h
clang::CXXMethodDecl::isVirtual
bool isVirtual() const
Definition: DeclCXX.h:2012
clang::CodeGen::CodeGenTypes::arrangeNullaryFunction
const CGFunctionInfo & arrangeNullaryFunction()
A nullary function is a freestanding function of type 'void ()'.
Definition: CGCall.cpp:704
clang::ASTContext::getCopyConstructorForExceptionObject
const CXXConstructorDecl * getCopyConstructorForExceptionObject(CXXRecordDecl *RD)
Definition: ASTContext.cpp:11817
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:3458
clang::CodeGen::CodeGenFunction::CurFuncDecl
const Decl * CurFuncDecl
CurFuncDecl - Holds the Decl for the current outermost non-closure context.
Definition: CodeGenFunction.h:320
clang::DiagnosticsEngine::Report
DiagnosticBuilder Report(SourceLocation Loc, unsigned DiagID)
Issue the message to the client.
Definition: Diagnostic.h:1536
clang::ImplicitParamDecl::Other
@ Other
Other implicit parameter.
Definition: Decl.h:1640
clang::CodeGen::CGBuilderTy::CreateLoad
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:69
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:2083
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1968
detectAmbiguousBases
static void detectAmbiguousBases(SmallVectorImpl< MSRTTIClass > &Classes)
Find ambiguity among base classes.
Definition: MicrosoftCXXABI.cpp:3706
clang::CodeGen::CodeGenFunction::ReturnValue
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
Definition: CodeGenFunction.h:356
clang::Decl::getDeclContext
DeclContext * getDeclContext()
Definition: DeclBase.h:434