clang  16.0.0git
CGVTables.cpp
Go to the documentation of this file.
1 //===--- CGVTables.cpp - Emit LLVM Code for C++ vtables -------------------===//
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 contains code dealing with C++ code generation of virtual tables.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "CGCXXABI.h"
14 #include "CodeGenFunction.h"
15 #include "CodeGenModule.h"
16 #include "clang/AST/Attr.h"
18 #include "clang/AST/RecordLayout.h"
22 #include "llvm/IR/IntrinsicInst.h"
23 #include "llvm/Support/Format.h"
24 #include "llvm/Transforms/Utils/Cloning.h"
25 #include <algorithm>
26 #include <cstdio>
27 
28 using namespace clang;
29 using namespace CodeGen;
30 
32  : CGM(CGM), VTContext(CGM.getContext().getVTableContext()) {}
33 
34 llvm::Constant *CodeGenModule::GetAddrOfThunk(StringRef Name, llvm::Type *FnTy,
35  GlobalDecl GD) {
36  return GetOrCreateLLVMFunction(Name, FnTy, GD, /*ForVTable=*/true,
37  /*DontDefer=*/true, /*IsThunk=*/true);
38 }
39 
40 static void setThunkProperties(CodeGenModule &CGM, const ThunkInfo &Thunk,
41  llvm::Function *ThunkFn, bool ForVTable,
42  GlobalDecl GD) {
43  CGM.setFunctionLinkage(GD, ThunkFn);
44  CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable, GD,
45  !Thunk.Return.isEmpty());
46 
47  // Set the right visibility.
48  CGM.setGVProperties(ThunkFn, GD);
49 
50  if (!CGM.getCXXABI().exportThunk()) {
51  ThunkFn->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
52  ThunkFn->setDSOLocal(true);
53  }
54 
55  if (CGM.supportsCOMDAT() && ThunkFn->isWeakForLinker())
56  ThunkFn->setComdat(CGM.getModule().getOrInsertComdat(ThunkFn->getName()));
57 }
58 
59 #ifndef NDEBUG
60 static bool similar(const ABIArgInfo &infoL, CanQualType typeL,
61  const ABIArgInfo &infoR, CanQualType typeR) {
62  return (infoL.getKind() == infoR.getKind() &&
63  (typeL == typeR ||
64  (isa<PointerType>(typeL) && isa<PointerType>(typeR)) ||
65  (isa<ReferenceType>(typeL) && isa<ReferenceType>(typeR))));
66 }
67 #endif
68 
70  QualType ResultType, RValue RV,
71  const ThunkInfo &Thunk) {
72  // Emit the return adjustment.
73  bool NullCheckValue = !ResultType->isReferenceType();
74 
75  llvm::BasicBlock *AdjustNull = nullptr;
76  llvm::BasicBlock *AdjustNotNull = nullptr;
77  llvm::BasicBlock *AdjustEnd = nullptr;
78 
79  llvm::Value *ReturnValue = RV.getScalarVal();
80 
81  if (NullCheckValue) {
82  AdjustNull = CGF.createBasicBlock("adjust.null");
83  AdjustNotNull = CGF.createBasicBlock("adjust.notnull");
84  AdjustEnd = CGF.createBasicBlock("adjust.end");
85 
86  llvm::Value *IsNull = CGF.Builder.CreateIsNull(ReturnValue);
87  CGF.Builder.CreateCondBr(IsNull, AdjustNull, AdjustNotNull);
88  CGF.EmitBlock(AdjustNotNull);
89  }
90 
91  auto ClassDecl = ResultType->getPointeeType()->getAsCXXRecordDecl();
92  auto ClassAlign = CGF.CGM.getClassPointerAlignment(ClassDecl);
93  ReturnValue = CGF.CGM.getCXXABI().performReturnAdjustment(
94  CGF,
95  Address(ReturnValue, CGF.ConvertTypeForMem(ResultType->getPointeeType()),
96  ClassAlign),
97  Thunk.Return);
98 
99  if (NullCheckValue) {
100  CGF.Builder.CreateBr(AdjustEnd);
101  CGF.EmitBlock(AdjustNull);
102  CGF.Builder.CreateBr(AdjustEnd);
103  CGF.EmitBlock(AdjustEnd);
104 
105  llvm::PHINode *PHI = CGF.Builder.CreatePHI(ReturnValue->getType(), 2);
106  PHI->addIncoming(ReturnValue, AdjustNotNull);
107  PHI->addIncoming(llvm::Constant::getNullValue(ReturnValue->getType()),
108  AdjustNull);
109  ReturnValue = PHI;
110  }
111 
112  return RValue::get(ReturnValue);
113 }
114 
115 /// This function clones a function's DISubprogram node and enters it into
116 /// a value map with the intent that the map can be utilized by the cloner
117 /// to short-circuit Metadata node mapping.
118 /// Furthermore, the function resolves any DILocalVariable nodes referenced
119 /// by dbg.value intrinsics so they can be properly mapped during cloning.
120 static void resolveTopLevelMetadata(llvm::Function *Fn,
121  llvm::ValueToValueMapTy &VMap) {
122  // Clone the DISubprogram node and put it into the Value map.
123  auto *DIS = Fn->getSubprogram();
124  if (!DIS)
125  return;
126  auto *NewDIS = DIS->replaceWithDistinct(DIS->clone());
127  VMap.MD()[DIS].reset(NewDIS);
128 
129  // Find all llvm.dbg.declare intrinsics and resolve the DILocalVariable nodes
130  // they are referencing.
131  for (auto &BB : Fn->getBasicBlockList()) {
132  for (auto &I : BB) {
133  if (auto *DII = dyn_cast<llvm::DbgVariableIntrinsic>(&I)) {
134  auto *DILocal = DII->getVariable();
135  if (!DILocal->isResolved())
136  DILocal->resolve();
137  }
138  }
139  }
140 }
141 
142 // This function does roughly the same thing as GenerateThunk, but in a
143 // very different way, so that va_start and va_end work correctly.
144 // FIXME: This function assumes "this" is the first non-sret LLVM argument of
145 // a function, and that there is an alloca built in the entry block
146 // for all accesses to "this".
147 // FIXME: This function assumes there is only one "ret" statement per function.
148 // FIXME: Cloning isn't correct in the presence of indirect goto!
149 // FIXME: This implementation of thunks bloats codesize by duplicating the
150 // function definition. There are alternatives:
151 // 1. Add some sort of stub support to LLVM for cases where we can
152 // do a this adjustment, then a sibcall.
153 // 2. We could transform the definition to take a va_list instead of an
154 // actual variable argument list, then have the thunks (including a
155 // no-op thunk for the regular definition) call va_start/va_end.
156 // There's a bit of per-call overhead for this solution, but it's
157 // better for codesize if the definition is long.
158 llvm::Function *
160  const CGFunctionInfo &FnInfo,
161  GlobalDecl GD, const ThunkInfo &Thunk) {
162  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
163  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
164  QualType ResultType = FPT->getReturnType();
165 
166  // Get the original function
167  assert(FnInfo.isVariadic());
168  llvm::Type *Ty = CGM.getTypes().GetFunctionType(FnInfo);
169  llvm::Value *Callee = CGM.GetAddrOfFunction(GD, Ty, /*ForVTable=*/true);
170  llvm::Function *BaseFn = cast<llvm::Function>(Callee);
171 
172  // Cloning can't work if we don't have a definition. The Microsoft ABI may
173  // require thunks when a definition is not available. Emit an error in these
174  // cases.
175  if (!MD->isDefined()) {
176  CGM.ErrorUnsupported(MD, "return-adjusting thunk with variadic arguments");
177  return Fn;
178  }
179  assert(!BaseFn->isDeclaration() && "cannot clone undefined variadic method");
180 
181  // Clone to thunk.
182  llvm::ValueToValueMapTy VMap;
183 
184  // We are cloning a function while some Metadata nodes are still unresolved.
185  // Ensure that the value mapper does not encounter any of them.
186  resolveTopLevelMetadata(BaseFn, VMap);
187  llvm::Function *NewFn = llvm::CloneFunction(BaseFn, VMap);
188  Fn->replaceAllUsesWith(NewFn);
189  NewFn->takeName(Fn);
190  Fn->eraseFromParent();
191  Fn = NewFn;
192 
193  // "Initialize" CGF (minimally).
194  CurFn = Fn;
195 
196  // Get the "this" value
197  llvm::Function::arg_iterator AI = Fn->arg_begin();
198  if (CGM.ReturnTypeUsesSRet(FnInfo))
199  ++AI;
200 
201  // Find the first store of "this", which will be to the alloca associated
202  // with "this".
203  Address ThisPtr =
206  llvm::BasicBlock *EntryBB = &Fn->front();
207  llvm::BasicBlock::iterator ThisStore =
208  llvm::find_if(*EntryBB, [&](llvm::Instruction &I) {
209  return isa<llvm::StoreInst>(I) &&
210  I.getOperand(0) == ThisPtr.getPointer();
211  });
212  assert(ThisStore != EntryBB->end() &&
213  "Store of this should be in entry block?");
214  // Adjust "this", if necessary.
215  Builder.SetInsertPoint(&*ThisStore);
216  llvm::Value *AdjustedThisPtr =
217  CGM.getCXXABI().performThisAdjustment(*this, ThisPtr, Thunk.This);
218  AdjustedThisPtr = Builder.CreateBitCast(AdjustedThisPtr,
219  ThisStore->getOperand(0)->getType());
220  ThisStore->setOperand(0, AdjustedThisPtr);
221 
222  if (!Thunk.Return.isEmpty()) {
223  // Fix up the returned value, if necessary.
224  for (llvm::BasicBlock &BB : *Fn) {
225  llvm::Instruction *T = BB.getTerminator();
226  if (isa<llvm::ReturnInst>(T)) {
227  RValue RV = RValue::get(T->getOperand(0));
228  T->eraseFromParent();
229  Builder.SetInsertPoint(&BB);
230  RV = PerformReturnAdjustment(*this, ResultType, RV, Thunk);
231  Builder.CreateRet(RV.getScalarVal());
232  break;
233  }
234  }
235  }
236 
237  return Fn;
238 }
239 
240 void CodeGenFunction::StartThunk(llvm::Function *Fn, GlobalDecl GD,
241  const CGFunctionInfo &FnInfo,
242  bool IsUnprototyped) {
243  assert(!CurGD.getDecl() && "CurGD was already set!");
244  CurGD = GD;
245  CurFuncIsThunk = true;
246 
247  // Build FunctionArgs.
248  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
249  QualType ThisType = MD->getThisType();
250  QualType ResultType;
251  if (IsUnprototyped)
252  ResultType = CGM.getContext().VoidTy;
253  else if (CGM.getCXXABI().HasThisReturn(GD))
254  ResultType = ThisType;
255  else if (CGM.getCXXABI().hasMostDerivedReturn(GD))
256  ResultType = CGM.getContext().VoidPtrTy;
257  else
258  ResultType = MD->getType()->castAs<FunctionProtoType>()->getReturnType();
259  FunctionArgList FunctionArgs;
260 
261  // Create the implicit 'this' parameter declaration.
262  CGM.getCXXABI().buildThisParam(*this, FunctionArgs);
263 
264  // Add the rest of the parameters, if we have a prototype to work with.
265  if (!IsUnprototyped) {
266  FunctionArgs.append(MD->param_begin(), MD->param_end());
267 
268  if (isa<CXXDestructorDecl>(MD))
269  CGM.getCXXABI().addImplicitStructorParams(*this, ResultType,
270  FunctionArgs);
271  }
272 
273  // Start defining the function.
274  auto NL = ApplyDebugLocation::CreateEmpty(*this);
275  StartFunction(GlobalDecl(), ResultType, Fn, FnInfo, FunctionArgs,
276  MD->getLocation());
277  // Create a scope with an artificial location for the body of this function.
278  auto AL = ApplyDebugLocation::CreateArtificial(*this);
279 
280  // Since we didn't pass a GlobalDecl to StartFunction, do this ourselves.
282  CXXThisValue = CXXABIThisValue;
283  CurCodeDecl = MD;
284  CurFuncDecl = MD;
285 }
286 
288  // Clear these to restore the invariants expected by
289  // StartFunction/FinishFunction.
290  CurCodeDecl = nullptr;
291  CurFuncDecl = nullptr;
292 
293  FinishFunction();
294 }
295 
296 void CodeGenFunction::EmitCallAndReturnForThunk(llvm::FunctionCallee Callee,
297  const ThunkInfo *Thunk,
298  bool IsUnprototyped) {
299  assert(isa<CXXMethodDecl>(CurGD.getDecl()) &&
300  "Please use a new CGF for this thunk");
301  const CXXMethodDecl *MD = cast<CXXMethodDecl>(CurGD.getDecl());
302 
303  // Adjust the 'this' pointer if necessary
304  llvm::Value *AdjustedThisPtr =
306  *this, LoadCXXThisAddress(), Thunk->This)
307  : LoadCXXThis();
308 
309  // If perfect forwarding is required a variadic method, a method using
310  // inalloca, or an unprototyped thunk, use musttail. Emit an error if this
311  // thunk requires a return adjustment, since that is impossible with musttail.
312  if (CurFnInfo->usesInAlloca() || CurFnInfo->isVariadic() || IsUnprototyped) {
313  if (Thunk && !Thunk->Return.isEmpty()) {
314  if (IsUnprototyped)
316  MD, "return-adjusting thunk with incomplete parameter type");
317  else if (CurFnInfo->isVariadic())
318  llvm_unreachable("shouldn't try to emit musttail return-adjusting "
319  "thunks for variadic functions");
320  else
322  MD, "non-trivial argument copy for return-adjusting thunk");
323  }
324  EmitMustTailThunk(CurGD, AdjustedThisPtr, Callee);
325  return;
326  }
327 
328  // Start building CallArgs.
329  CallArgList CallArgs;
330  QualType ThisType = MD->getThisType();
331  CallArgs.add(RValue::get(AdjustedThisPtr), ThisType);
332 
333  if (isa<CXXDestructorDecl>(MD))
335 
336 #ifndef NDEBUG
337  unsigned PrefixArgs = CallArgs.size() - 1;
338 #endif
339  // Add the rest of the arguments.
340  for (const ParmVarDecl *PD : MD->parameters())
341  EmitDelegateCallArg(CallArgs, PD, SourceLocation());
342 
343  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
344 
345 #ifndef NDEBUG
346  const CGFunctionInfo &CallFnInfo = CGM.getTypes().arrangeCXXMethodCall(
347  CallArgs, FPT, RequiredArgs::forPrototypePlus(FPT, 1), PrefixArgs);
348  assert(CallFnInfo.getRegParm() == CurFnInfo->getRegParm() &&
349  CallFnInfo.isNoReturn() == CurFnInfo->isNoReturn() &&
350  CallFnInfo.getCallingConvention() == CurFnInfo->getCallingConvention());
351  assert(isa<CXXDestructorDecl>(MD) || // ignore dtor return types
352  similar(CallFnInfo.getReturnInfo(), CallFnInfo.getReturnType(),
354  assert(CallFnInfo.arg_size() == CurFnInfo->arg_size());
355  for (unsigned i = 0, e = CurFnInfo->arg_size(); i != e; ++i)
356  assert(similar(CallFnInfo.arg_begin()[i].info,
357  CallFnInfo.arg_begin()[i].type,
358  CurFnInfo->arg_begin()[i].info,
359  CurFnInfo->arg_begin()[i].type));
360 #endif
361 
362  // Determine whether we have a return value slot to use.
363  QualType ResultType = CGM.getCXXABI().HasThisReturn(CurGD)
364  ? ThisType
367  : FPT->getReturnType();
368  ReturnValueSlot Slot;
369  if (!ResultType->isVoidType() &&
371  hasAggregateEvaluationKind(ResultType)))
372  Slot = ReturnValueSlot(ReturnValue, ResultType.isVolatileQualified(),
373  /*IsUnused=*/false, /*IsExternallyDestructed=*/true);
374 
375  // Now emit our call.
376  llvm::CallBase *CallOrInvoke;
377  RValue RV = EmitCall(*CurFnInfo, CGCallee::forDirect(Callee, CurGD), Slot,
378  CallArgs, &CallOrInvoke);
379 
380  // Consider return adjustment if we have ThunkInfo.
381  if (Thunk && !Thunk->Return.isEmpty())
382  RV = PerformReturnAdjustment(*this, ResultType, RV, *Thunk);
383  else if (llvm::CallInst* Call = dyn_cast<llvm::CallInst>(CallOrInvoke))
384  Call->setTailCallKind(llvm::CallInst::TCK_Tail);
385 
386  // Emit return.
387  if (!ResultType->isVoidType() && Slot.isNull())
388  CGM.getCXXABI().EmitReturnFromThunk(*this, RV, ResultType);
389 
390  // Disable the final ARC autorelease.
391  AutoreleaseResult = false;
392 
393  FinishThunk();
394 }
395 
397  llvm::Value *AdjustedThisPtr,
398  llvm::FunctionCallee Callee) {
399  // Emitting a musttail call thunk doesn't use any of the CGCall.cpp machinery
400  // to translate AST arguments into LLVM IR arguments. For thunks, we know
401  // that the caller prototype more or less matches the callee prototype with
402  // the exception of 'this'.
403  SmallVector<llvm::Value *, 8> Args(llvm::make_pointer_range(CurFn->args()));
404 
405  // Set the adjusted 'this' pointer.
406  const ABIArgInfo &ThisAI = CurFnInfo->arg_begin()->info;
407  if (ThisAI.isDirect()) {
408  const ABIArgInfo &RetAI = CurFnInfo->getReturnInfo();
409  int ThisArgNo = RetAI.isIndirect() && !RetAI.isSRetAfterThis() ? 1 : 0;
410  llvm::Type *ThisType = Args[ThisArgNo]->getType();
411  if (ThisType != AdjustedThisPtr->getType())
412  AdjustedThisPtr = Builder.CreateBitCast(AdjustedThisPtr, ThisType);
413  Args[ThisArgNo] = AdjustedThisPtr;
414  } else {
415  assert(ThisAI.isInAlloca() && "this is passed directly or inalloca");
416  Address ThisAddr = GetAddrOfLocalVar(CXXABIThisDecl);
417  llvm::Type *ThisType = ThisAddr.getElementType();
418  if (ThisType != AdjustedThisPtr->getType())
419  AdjustedThisPtr = Builder.CreateBitCast(AdjustedThisPtr, ThisType);
420  Builder.CreateStore(AdjustedThisPtr, ThisAddr);
421  }
422 
423  // Emit the musttail call manually. Even if the prologue pushed cleanups, we
424  // don't actually want to run them.
425  llvm::CallInst *Call = Builder.CreateCall(Callee, Args);
426  Call->setTailCallKind(llvm::CallInst::TCK_MustTail);
427 
428  // Apply the standard set of call attributes.
429  unsigned CallingConv;
430  llvm::AttributeList Attrs;
431  CGM.ConstructAttributeList(Callee.getCallee()->getName(), *CurFnInfo, GD,
432  Attrs, CallingConv, /*AttrOnCallSite=*/true,
433  /*IsThunk=*/false);
434  Call->setAttributes(Attrs);
435  Call->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
436 
437  if (Call->getType()->isVoidTy())
438  Builder.CreateRetVoid();
439  else
440  Builder.CreateRet(Call);
441 
442  // Finish the function to maintain CodeGenFunction invariants.
443  // FIXME: Don't emit unreachable code.
445 
446  FinishThunk();
447 }
448 
449 void CodeGenFunction::generateThunk(llvm::Function *Fn,
450  const CGFunctionInfo &FnInfo, GlobalDecl GD,
451  const ThunkInfo &Thunk,
452  bool IsUnprototyped) {
453  StartThunk(Fn, GD, FnInfo, IsUnprototyped);
454  // Create a scope with an artificial location for the body of this function.
455  auto AL = ApplyDebugLocation::CreateArtificial(*this);
456 
457  // Get our callee. Use a placeholder type if this method is unprototyped so
458  // that CodeGenModule doesn't try to set attributes.
459  llvm::Type *Ty;
460  if (IsUnprototyped)
461  Ty = llvm::StructType::get(getLLVMContext());
462  else
463  Ty = CGM.getTypes().GetFunctionType(FnInfo);
464 
465  llvm::Constant *Callee = CGM.GetAddrOfFunction(GD, Ty, /*ForVTable=*/true);
466 
467  // Fix up the function type for an unprototyped musttail call.
468  if (IsUnprototyped)
469  Callee = llvm::ConstantExpr::getBitCast(Callee, Fn->getType());
470 
471  // Make the call and return the result.
472  EmitCallAndReturnForThunk(llvm::FunctionCallee(Fn->getFunctionType(), Callee),
473  &Thunk, IsUnprototyped);
474 }
475 
477  bool IsUnprototyped, bool ForVTable) {
478  // Always emit thunks in the MS C++ ABI. We cannot rely on other TUs to
479  // provide thunks for us.
480  if (CGM.getTarget().getCXXABI().isMicrosoft())
481  return true;
482 
483  // In the Itanium C++ ABI, vtable thunks are provided by TUs that provide
484  // definitions of the main method. Therefore, emitting thunks with the vtable
485  // is purely an optimization. Emit the thunk if optimizations are enabled and
486  // all of the parameter types are complete.
487  if (ForVTable)
488  return CGM.getCodeGenOpts().OptimizationLevel && !IsUnprototyped;
489 
490  // Always emit thunks along with the method definition.
491  return true;
492 }
493 
494 llvm::Constant *CodeGenVTables::maybeEmitThunk(GlobalDecl GD,
495  const ThunkInfo &TI,
496  bool ForVTable) {
497  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
498 
499  // First, get a declaration. Compute the mangled name. Don't worry about
500  // getting the function prototype right, since we may only need this
501  // declaration to fill in a vtable slot.
502  SmallString<256> Name;
503  MangleContext &MCtx = CGM.getCXXABI().getMangleContext();
504  llvm::raw_svector_ostream Out(Name);
505  if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD))
506  MCtx.mangleCXXDtorThunk(DD, GD.getDtorType(), TI.This, Out);
507  else
508  MCtx.mangleThunk(MD, TI, Out);
509  llvm::Type *ThunkVTableTy = CGM.getTypes().GetFunctionTypeForVTable(GD);
510  llvm::Constant *Thunk = CGM.GetAddrOfThunk(Name, ThunkVTableTy, GD);
511 
512  // If we don't need to emit a definition, return this declaration as is.
513  bool IsUnprototyped = !CGM.getTypes().isFuncTypeConvertible(
514  MD->getType()->castAs<FunctionType>());
515  if (!shouldEmitVTableThunk(CGM, MD, IsUnprototyped, ForVTable))
516  return Thunk;
517 
518  // Arrange a function prototype appropriate for a function definition. In some
519  // cases in the MS ABI, we may need to build an unprototyped musttail thunk.
520  const CGFunctionInfo &FnInfo =
521  IsUnprototyped ? CGM.getTypes().arrangeUnprototypedMustTailThunk(MD)
523  llvm::FunctionType *ThunkFnTy = CGM.getTypes().GetFunctionType(FnInfo);
524 
525  // If the type of the underlying GlobalValue is wrong, we'll have to replace
526  // it. It should be a declaration.
527  llvm::Function *ThunkFn = cast<llvm::Function>(Thunk->stripPointerCasts());
528  if (ThunkFn->getFunctionType() != ThunkFnTy) {
529  llvm::GlobalValue *OldThunkFn = ThunkFn;
530 
531  assert(OldThunkFn->isDeclaration() && "Shouldn't replace non-declaration");
532 
533  // Remove the name from the old thunk function and get a new thunk.
534  OldThunkFn->setName(StringRef());
535  ThunkFn = llvm::Function::Create(ThunkFnTy, llvm::Function::ExternalLinkage,
536  Name.str(), &CGM.getModule());
537  CGM.SetLLVMFunctionAttributes(MD, FnInfo, ThunkFn, /*IsThunk=*/false);
538 
539  // If needed, replace the old thunk with a bitcast.
540  if (!OldThunkFn->use_empty()) {
541  llvm::Constant *NewPtrForOldDecl =
542  llvm::ConstantExpr::getBitCast(ThunkFn, OldThunkFn->getType());
543  OldThunkFn->replaceAllUsesWith(NewPtrForOldDecl);
544  }
545 
546  // Remove the old thunk.
547  OldThunkFn->eraseFromParent();
548  }
549 
550  bool ABIHasKeyFunctions = CGM.getTarget().getCXXABI().hasKeyFunctions();
551  bool UseAvailableExternallyLinkage = ForVTable && ABIHasKeyFunctions;
552 
553  if (!ThunkFn->isDeclaration()) {
554  if (!ABIHasKeyFunctions || UseAvailableExternallyLinkage) {
555  // There is already a thunk emitted for this function, do nothing.
556  return ThunkFn;
557  }
558 
559  setThunkProperties(CGM, TI, ThunkFn, ForVTable, GD);
560  return ThunkFn;
561  }
562 
563  // If this will be unprototyped, add the "thunk" attribute so that LLVM knows
564  // that the return type is meaningless. These thunks can be used to call
565  // functions with differing return types, and the caller is required to cast
566  // the prototype appropriately to extract the correct value.
567  if (IsUnprototyped)
568  ThunkFn->addFnAttr("thunk");
569 
571 
572  // Thunks for variadic methods are special because in general variadic
573  // arguments cannot be perfectly forwarded. In the general case, clang
574  // implements such thunks by cloning the original function body. However, for
575  // thunks with no return adjustment on targets that support musttail, we can
576  // use musttail to perfectly forward the variadic arguments.
577  bool ShouldCloneVarArgs = false;
578  if (!IsUnprototyped && ThunkFn->isVarArg()) {
579  ShouldCloneVarArgs = true;
580  if (TI.Return.isEmpty()) {
581  switch (CGM.getTriple().getArch()) {
582  case llvm::Triple::x86_64:
583  case llvm::Triple::x86:
584  case llvm::Triple::aarch64:
585  ShouldCloneVarArgs = false;
586  break;
587  default:
588  break;
589  }
590  }
591  }
592 
593  if (ShouldCloneVarArgs) {
594  if (UseAvailableExternallyLinkage)
595  return ThunkFn;
596  ThunkFn =
597  CodeGenFunction(CGM).GenerateVarArgsThunk(ThunkFn, FnInfo, GD, TI);
598  } else {
599  // Normal thunk body generation.
600  CodeGenFunction(CGM).generateThunk(ThunkFn, FnInfo, GD, TI, IsUnprototyped);
601  }
602 
603  setThunkProperties(CGM, TI, ThunkFn, ForVTable, GD);
604  return ThunkFn;
605 }
606 
608  const CXXMethodDecl *MD =
609  cast<CXXMethodDecl>(GD.getDecl())->getCanonicalDecl();
610 
611  // We don't need to generate thunks for the base destructor.
612  if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base)
613  return;
614 
615  const VTableContextBase::ThunkInfoVectorTy *ThunkInfoVector =
616  VTContext->getThunkInfo(GD);
617 
618  if (!ThunkInfoVector)
619  return;
620 
621  for (const ThunkInfo& Thunk : *ThunkInfoVector)
622  maybeEmitThunk(GD, Thunk, /*ForVTable=*/false);
623 }
624 
625 void CodeGenVTables::addRelativeComponent(ConstantArrayBuilder &builder,
626  llvm::Constant *component,
627  unsigned vtableAddressPoint,
628  bool vtableHasLocalLinkage,
629  bool isCompleteDtor) const {
630  // No need to get the offset of a nullptr.
631  if (component->isNullValue())
632  return builder.add(llvm::ConstantInt::get(CGM.Int32Ty, 0));
633 
634  auto *globalVal =
635  cast<llvm::GlobalValue>(component->stripPointerCastsAndAliases());
636  llvm::Module &module = CGM.getModule();
637 
638  // We don't want to copy the linkage of the vtable exactly because we still
639  // want the stub/proxy to be emitted for properly calculating the offset.
640  // Examples where there would be no symbol emitted are available_externally
641  // and private linkages.
642  auto stubLinkage = vtableHasLocalLinkage ? llvm::GlobalValue::InternalLinkage
644 
645  llvm::Constant *target;
646  if (auto *func = dyn_cast<llvm::Function>(globalVal)) {
647  target = llvm::DSOLocalEquivalent::get(func);
648  } else {
649  llvm::SmallString<16> rttiProxyName(globalVal->getName());
650  rttiProxyName.append(".rtti_proxy");
651 
652  // The RTTI component may not always be emitted in the same linkage unit as
653  // the vtable. As a general case, we can make a dso_local proxy to the RTTI
654  // that points to the actual RTTI struct somewhere. This will result in a
655  // GOTPCREL relocation when taking the relative offset to the proxy.
656  llvm::GlobalVariable *proxy = module.getNamedGlobal(rttiProxyName);
657  if (!proxy) {
658  proxy = new llvm::GlobalVariable(module, globalVal->getType(),
659  /*isConstant=*/true, stubLinkage,
660  globalVal, rttiProxyName);
661  proxy->setDSOLocal(true);
662  proxy->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
663  if (!proxy->hasLocalLinkage()) {
664  proxy->setVisibility(llvm::GlobalValue::HiddenVisibility);
665  proxy->setComdat(module.getOrInsertComdat(rttiProxyName));
666  }
667  // Do not instrument the rtti proxies with hwasan to avoid a duplicate
668  // symbol error. Aliases generated by hwasan will retain the same namebut
669  // the addresses they are set to may have different tags from different
670  // compilation units. We don't run into this without hwasan because the
671  // proxies are in comdat groups, but those aren't propagated to the alias.
672  RemoveHwasanMetadata(proxy);
673  }
674  target = proxy;
675  }
676 
677  builder.addRelativeOffsetToPosition(CGM.Int32Ty, target,
678  /*position=*/vtableAddressPoint);
679 }
680 
681 bool CodeGenVTables::useRelativeLayout() const {
682  return CGM.getTarget().getCXXABI().isItaniumFamily() &&
684 }
685 
686 llvm::Type *CodeGenVTables::getVTableComponentType() const {
687  if (useRelativeLayout())
688  return CGM.Int32Ty;
689  return CGM.Int8PtrTy;
690 }
691 
692 static void AddPointerLayoutOffset(const CodeGenModule &CGM,
693  ConstantArrayBuilder &builder,
694  CharUnits offset) {
695  builder.add(llvm::ConstantExpr::getIntToPtr(
696  llvm::ConstantInt::get(CGM.PtrDiffTy, offset.getQuantity()),
697  CGM.Int8PtrTy));
698 }
699 
700 static void AddRelativeLayoutOffset(const CodeGenModule &CGM,
701  ConstantArrayBuilder &builder,
702  CharUnits offset) {
703  builder.add(llvm::ConstantInt::get(CGM.Int32Ty, offset.getQuantity()));
704 }
705 
706 void CodeGenVTables::addVTableComponent(ConstantArrayBuilder &builder,
707  const VTableLayout &layout,
708  unsigned componentIndex,
709  llvm::Constant *rtti,
710  unsigned &nextVTableThunkIndex,
711  unsigned vtableAddressPoint,
712  bool vtableHasLocalLinkage) {
713  auto &component = layout.vtable_components()[componentIndex];
714 
715  auto addOffsetConstant =
716  useRelativeLayout() ? AddRelativeLayoutOffset : AddPointerLayoutOffset;
717 
718  switch (component.getKind()) {
720  return addOffsetConstant(CGM, builder, component.getVCallOffset());
721 
723  return addOffsetConstant(CGM, builder, component.getVBaseOffset());
724 
726  return addOffsetConstant(CGM, builder, component.getOffsetToTop());
727 
729  if (useRelativeLayout())
730  return addRelativeComponent(builder, rtti, vtableAddressPoint,
731  vtableHasLocalLinkage,
732  /*isCompleteDtor=*/false);
733  else
734  return builder.add(llvm::ConstantExpr::getBitCast(rtti, CGM.Int8PtrTy));
735 
739  GlobalDecl GD = component.getGlobalDecl();
740 
741  if (CGM.getLangOpts().CUDA) {
742  // Emit NULL for methods we can't codegen on this
743  // side. Otherwise we'd end up with vtable with unresolved
744  // references.
745  const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
746  // OK on device side: functions w/ __device__ attribute
747  // OK on host side: anything except __device__-only functions.
748  bool CanEmitMethod =
749  CGM.getLangOpts().CUDAIsDevice
750  ? MD->hasAttr<CUDADeviceAttr>()
751  : (MD->hasAttr<CUDAHostAttr>() || !MD->hasAttr<CUDADeviceAttr>());
752  if (!CanEmitMethod)
753  return builder.add(llvm::ConstantExpr::getNullValue(CGM.Int8PtrTy));
754  // Method is acceptable, continue processing as usual.
755  }
756 
757  auto getSpecialVirtualFn = [&](StringRef name) -> llvm::Constant * {
758  // FIXME(PR43094): When merging comdat groups, lld can select a local
759  // symbol as the signature symbol even though it cannot be accessed
760  // outside that symbol's TU. The relative vtables ABI would make
761  // __cxa_pure_virtual and __cxa_deleted_virtual local symbols, and
762  // depending on link order, the comdat groups could resolve to the one
763  // with the local symbol. As a temporary solution, fill these components
764  // with zero. We shouldn't be calling these in the first place anyway.
765  if (useRelativeLayout())
766  return llvm::ConstantPointerNull::get(CGM.Int8PtrTy);
767 
768  // For NVPTX devices in OpenMP emit special functon as null pointers,
769  // otherwise linking ends up with unresolved references.
770  if (CGM.getLangOpts().OpenMP && CGM.getLangOpts().OpenMPIsDevice &&
771  CGM.getTriple().isNVPTX())
772  return llvm::ConstantPointerNull::get(CGM.Int8PtrTy);
773  llvm::FunctionType *fnTy =
774  llvm::FunctionType::get(CGM.VoidTy, /*isVarArg=*/false);
775  llvm::Constant *fn = cast<llvm::Constant>(
776  CGM.CreateRuntimeFunction(fnTy, name).getCallee());
777  if (auto f = dyn_cast<llvm::Function>(fn))
778  f->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
779  return llvm::ConstantExpr::getBitCast(fn, CGM.Int8PtrTy);
780  };
781 
782  llvm::Constant *fnPtr;
783 
784  // Pure virtual member functions.
785  if (cast<CXXMethodDecl>(GD.getDecl())->isPure()) {
786  if (!PureVirtualFn)
787  PureVirtualFn =
788  getSpecialVirtualFn(CGM.getCXXABI().GetPureVirtualCallName());
789  fnPtr = PureVirtualFn;
790 
791  // Deleted virtual member functions.
792  } else if (cast<CXXMethodDecl>(GD.getDecl())->isDeleted()) {
793  if (!DeletedVirtualFn)
794  DeletedVirtualFn =
795  getSpecialVirtualFn(CGM.getCXXABI().GetDeletedVirtualCallName());
796  fnPtr = DeletedVirtualFn;
797 
798  // Thunks.
799  } else if (nextVTableThunkIndex < layout.vtable_thunks().size() &&
800  layout.vtable_thunks()[nextVTableThunkIndex].first ==
801  componentIndex) {
802  auto &thunkInfo = layout.vtable_thunks()[nextVTableThunkIndex].second;
803 
804  nextVTableThunkIndex++;
805  fnPtr = maybeEmitThunk(GD, thunkInfo, /*ForVTable=*/true);
806 
807  // Otherwise we can use the method definition directly.
808  } else {
809  llvm::Type *fnTy = CGM.getTypes().GetFunctionTypeForVTable(GD);
810  fnPtr = CGM.GetAddrOfFunction(GD, fnTy, /*ForVTable=*/true);
811  }
812 
813  if (useRelativeLayout()) {
814  return addRelativeComponent(
815  builder, fnPtr, vtableAddressPoint, vtableHasLocalLinkage,
816  component.getKind() == VTableComponent::CK_CompleteDtorPointer);
817  } else
818  return builder.add(llvm::ConstantExpr::getBitCast(fnPtr, CGM.Int8PtrTy));
819  }
820 
822  if (useRelativeLayout())
823  return builder.add(llvm::ConstantExpr::getNullValue(CGM.Int32Ty));
824  else
825  return builder.addNullPointer(CGM.Int8PtrTy);
826  }
827 
828  llvm_unreachable("Unexpected vtable component kind");
829 }
830 
831 llvm::Type *CodeGenVTables::getVTableType(const VTableLayout &layout) {
833  llvm::Type *componentType = getVTableComponentType();
834  for (unsigned i = 0, e = layout.getNumVTables(); i != e; ++i)
835  tys.push_back(llvm::ArrayType::get(componentType, layout.getVTableSize(i)));
836 
837  return llvm::StructType::get(CGM.getLLVMContext(), tys);
838 }
839 
841  const VTableLayout &layout,
842  llvm::Constant *rtti,
843  bool vtableHasLocalLinkage) {
844  llvm::Type *componentType = getVTableComponentType();
845 
846  const auto &addressPoints = layout.getAddressPointIndices();
847  unsigned nextVTableThunkIndex = 0;
848  for (unsigned vtableIndex = 0, endIndex = layout.getNumVTables();
849  vtableIndex != endIndex; ++vtableIndex) {
850  auto vtableElem = builder.beginArray(componentType);
851 
852  size_t vtableStart = layout.getVTableOffset(vtableIndex);
853  size_t vtableEnd = vtableStart + layout.getVTableSize(vtableIndex);
854  for (size_t componentIndex = vtableStart; componentIndex < vtableEnd;
855  ++componentIndex) {
856  addVTableComponent(vtableElem, layout, componentIndex, rtti,
857  nextVTableThunkIndex, addressPoints[vtableIndex],
858  vtableHasLocalLinkage);
859  }
860  vtableElem.finishAndAddTo(builder);
861  }
862 }
863 
865  const CXXRecordDecl *RD, const BaseSubobject &Base, bool BaseIsVirtual,
866  llvm::GlobalVariable::LinkageTypes Linkage,
867  VTableAddressPointsMapTy &AddressPoints) {
868  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
869  DI->completeClassData(Base.getBase());
870 
871  std::unique_ptr<VTableLayout> VTLayout(
872  getItaniumVTableContext().createConstructionVTableLayout(
873  Base.getBase(), Base.getBaseOffset(), BaseIsVirtual, RD));
874 
875  // Add the address points.
876  AddressPoints = VTLayout->getAddressPoints();
877 
878  // Get the mangled construction vtable name.
879  SmallString<256> OutName;
880  llvm::raw_svector_ostream Out(OutName);
881  cast<ItaniumMangleContext>(CGM.getCXXABI().getMangleContext())
882  .mangleCXXCtorVTable(RD, Base.getBaseOffset().getQuantity(),
883  Base.getBase(), Out);
884  SmallString<256> Name(OutName);
885 
886  bool UsingRelativeLayout = getItaniumVTableContext().isRelativeLayout();
887  bool VTableAliasExists =
888  UsingRelativeLayout && CGM.getModule().getNamedAlias(Name);
889  if (VTableAliasExists) {
890  // We previously made the vtable hidden and changed its name.
891  Name.append(".local");
892  }
893 
894  llvm::Type *VTType = getVTableType(*VTLayout);
895 
896  // Construction vtable symbols are not part of the Itanium ABI, so we cannot
897  // guarantee that they actually will be available externally. Instead, when
898  // emitting an available_externally VTT, we provide references to an internal
899  // linkage construction vtable. The ABI only requires complete-object vtables
900  // to be the same for all instances of a type, not construction vtables.
901  if (Linkage == llvm::GlobalVariable::AvailableExternallyLinkage)
903 
904  unsigned Align = CGM.getDataLayout().getABITypeAlignment(VTType);
905 
906  // Create the variable that will hold the construction vtable.
907  llvm::GlobalVariable *VTable =
908  CGM.CreateOrReplaceCXXRuntimeVariable(Name, VTType, Linkage, Align);
909 
910  // V-tables are always unnamed_addr.
911  VTable->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
912 
913  llvm::Constant *RTTI = CGM.GetAddrOfRTTIDescriptor(
914  CGM.getContext().getTagDeclType(Base.getBase()));
915 
916  // Create and set the initializer.
917  ConstantInitBuilder builder(CGM);
918  auto components = builder.beginStruct();
919  createVTableInitializer(components, *VTLayout, RTTI,
920  VTable->hasLocalLinkage());
921  components.finishAndSetAsInitializer(VTable);
922 
923  // Set properties only after the initializer has been set to ensure that the
924  // GV is treated as definition and not declaration.
925  assert(!VTable->isDeclaration() && "Shouldn't set properties on declaration");
926  CGM.setGVProperties(VTable, RD);
927 
928  CGM.EmitVTableTypeMetadata(RD, VTable, *VTLayout.get());
929 
930  if (UsingRelativeLayout) {
931  RemoveHwasanMetadata(VTable);
932  if (!VTable->isDSOLocal())
933  GenerateRelativeVTableAlias(VTable, OutName);
934  }
935 
936  return VTable;
937 }
938 
939 // Ensure this vtable is not instrumented by hwasan. That is, a global alias is
940 // not generated for it. This is mainly used by the relative-vtables ABI where
941 // vtables instead contain 32-bit offsets between the vtable and function
942 // pointers. Hwasan is disabled for these vtables for now because the tag in a
943 // vtable pointer may fail the overflow check when resolving 32-bit PLT
944 // relocations. A future alternative for this would be finding which usages of
945 // the vtable can continue to use the untagged hwasan value without any loss of
946 // value in hwasan.
947 void CodeGenVTables::RemoveHwasanMetadata(llvm::GlobalValue *GV) const {
948  if (CGM.getLangOpts().Sanitize.has(SanitizerKind::HWAddress)) {
949  llvm::GlobalValue::SanitizerMetadata Meta;
950  if (GV->hasSanitizerMetadata())
951  Meta = GV->getSanitizerMetadata();
952  Meta.NoHWAddress = true;
953  GV->setSanitizerMetadata(Meta);
954  }
955 }
956 
957 // If the VTable is not dso_local, then we will not be able to indicate that
958 // the VTable does not need a relocation and move into rodata. A frequent
959 // time this can occur is for classes that should be made public from a DSO
960 // (like in libc++). For cases like these, we can make the vtable hidden or
961 // private and create a public alias with the same visibility and linkage as
962 // the original vtable type.
963 void CodeGenVTables::GenerateRelativeVTableAlias(llvm::GlobalVariable *VTable,
964  llvm::StringRef AliasNameRef) {
965  assert(getItaniumVTableContext().isRelativeLayout() &&
966  "Can only use this if the relative vtable ABI is used");
967  assert(!VTable->isDSOLocal() && "This should be called only if the vtable is "
968  "not guaranteed to be dso_local");
969 
970  // If the vtable is available_externally, we shouldn't (or need to) generate
971  // an alias for it in the first place since the vtable won't actually by
972  // emitted in this compilation unit.
973  if (VTable->hasAvailableExternallyLinkage())
974  return;
975 
976  // Create a new string in the event the alias is already the name of the
977  // vtable. Using the reference directly could lead to use of an inititialized
978  // value in the module's StringMap.
979  llvm::SmallString<256> AliasName(AliasNameRef);
980  VTable->setName(AliasName + ".local");
981 
982  auto Linkage = VTable->getLinkage();
983  assert(llvm::GlobalAlias::isValidLinkage(Linkage) &&
984  "Invalid vtable alias linkage");
985 
986  llvm::GlobalAlias *VTableAlias = CGM.getModule().getNamedAlias(AliasName);
987  if (!VTableAlias) {
988  VTableAlias = llvm::GlobalAlias::create(VTable->getValueType(),
989  VTable->getAddressSpace(), Linkage,
990  AliasName, &CGM.getModule());
991  } else {
992  assert(VTableAlias->getValueType() == VTable->getValueType());
993  assert(VTableAlias->getLinkage() == Linkage);
994  }
995  VTableAlias->setVisibility(VTable->getVisibility());
996  VTableAlias->setUnnamedAddr(VTable->getUnnamedAddr());
997 
998  // Both of these imply dso_local for the vtable.
999  if (!VTable->hasComdat()) {
1000  // If this is in a comdat, then we shouldn't make the linkage private due to
1001  // an issue in lld where private symbols can be used as the key symbol when
1002  // choosing the prevelant group. This leads to "relocation refers to a
1003  // symbol in a discarded section".
1004  VTable->setLinkage(llvm::GlobalValue::PrivateLinkage);
1005  } else {
1006  // We should at least make this hidden since we don't want to expose it.
1007  VTable->setVisibility(llvm::GlobalValue::HiddenVisibility);
1008  }
1009 
1010  VTableAlias->setAliasee(VTable);
1011 }
1012 
1014  const CXXRecordDecl *RD) {
1015  return CGM.getCodeGenOpts().OptimizationLevel > 0 &&
1017 }
1018 
1019 /// Compute the required linkage of the vtable for the given class.
1020 ///
1021 /// Note that we only call this at the end of the translation unit.
1022 llvm::GlobalVariable::LinkageTypes
1024  if (!RD->isExternallyVisible())
1026 
1027  // We're at the end of the translation unit, so the current key
1028  // function is fully correct.
1029  const CXXMethodDecl *keyFunction = Context.getCurrentKeyFunction(RD);
1030  if (keyFunction && !RD->hasAttr<DLLImportAttr>()) {
1031  // If this class has a key function, use that to determine the
1032  // linkage of the vtable.
1033  const FunctionDecl *def = nullptr;
1034  if (keyFunction->hasBody(def))
1035  keyFunction = cast<CXXMethodDecl>(def);
1036 
1037  switch (keyFunction->getTemplateSpecializationKind()) {
1038  case TSK_Undeclared:
1040  assert((def || CodeGenOpts.OptimizationLevel > 0 ||
1041  CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo) &&
1042  "Shouldn't query vtable linkage without key function, "
1043  "optimizations, or debug info");
1044  if (!def && CodeGenOpts.OptimizationLevel > 0)
1045  return llvm::GlobalVariable::AvailableExternallyLinkage;
1046 
1047  if (keyFunction->isInlined())
1048  return !Context.getLangOpts().AppleKext ?
1049  llvm::GlobalVariable::LinkOnceODRLinkage :
1051 
1053 
1055  return !Context.getLangOpts().AppleKext ?
1056  llvm::GlobalVariable::LinkOnceODRLinkage :
1058 
1060  return !Context.getLangOpts().AppleKext ?
1061  llvm::GlobalVariable::WeakODRLinkage :
1063 
1065  llvm_unreachable("Should not have been asked to emit this");
1066  }
1067  }
1068 
1069  // -fapple-kext mode does not support weak linkage, so we must use
1070  // internal linkage.
1071  if (Context.getLangOpts().AppleKext)
1073 
1074  llvm::GlobalVariable::LinkageTypes DiscardableODRLinkage =
1075  llvm::GlobalValue::LinkOnceODRLinkage;
1076  llvm::GlobalVariable::LinkageTypes NonDiscardableODRLinkage =
1077  llvm::GlobalValue::WeakODRLinkage;
1078  if (RD->hasAttr<DLLExportAttr>()) {
1079  // Cannot discard exported vtables.
1080  DiscardableODRLinkage = NonDiscardableODRLinkage;
1081  } else if (RD->hasAttr<DLLImportAttr>()) {
1082  // Imported vtables are available externally.
1083  DiscardableODRLinkage = llvm::GlobalVariable::AvailableExternallyLinkage;
1084  NonDiscardableODRLinkage = llvm::GlobalVariable::AvailableExternallyLinkage;
1085  }
1086 
1087  switch (RD->getTemplateSpecializationKind()) {
1088  case TSK_Undeclared:
1091  return DiscardableODRLinkage;
1092 
1094  // Explicit instantiations in MSVC do not provide vtables, so we must emit
1095  // our own.
1096  if (getTarget().getCXXABI().isMicrosoft())
1097  return DiscardableODRLinkage;
1098  return shouldEmitAvailableExternallyVTable(*this, RD)
1099  ? llvm::GlobalVariable::AvailableExternallyLinkage
1101 
1103  return NonDiscardableODRLinkage;
1104  }
1105 
1106  llvm_unreachable("Invalid TemplateSpecializationKind!");
1107 }
1108 
1109 /// This is a callback from Sema to tell us that a particular vtable is
1110 /// required to be emitted in this translation unit.
1111 ///
1112 /// This is only called for vtables that _must_ be emitted (mainly due to key
1113 /// functions). For weak vtables, CodeGen tracks when they are needed and
1114 /// emits them as-needed.
1116  VTables.GenerateClassData(theClass);
1117 }
1118 
1119 void
1121  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
1122  DI->completeClassData(RD);
1123 
1124  if (RD->getNumVBases())
1126 
1127  CGM.getCXXABI().emitVTableDefinitions(*this, RD);
1128 }
1129 
1130 /// At this point in the translation unit, does it appear that can we
1131 /// rely on the vtable being defined elsewhere in the program?
1132 ///
1133 /// The response is really only definitive when called at the end of
1134 /// the translation unit.
1135 ///
1136 /// The only semantic restriction here is that the object file should
1137 /// not contain a vtable definition when that vtable is defined
1138 /// strongly elsewhere. Otherwise, we'd just like to avoid emitting
1139 /// vtables when unnecessary.
1141  assert(RD->isDynamicClass() && "Non-dynamic classes have no VTable.");
1142 
1143  // We always synthesize vtables if they are needed in the MS ABI. MSVC doesn't
1144  // emit them even if there is an explicit template instantiation.
1145  if (CGM.getTarget().getCXXABI().isMicrosoft())
1146  return false;
1147 
1148  // If we have an explicit instantiation declaration (and not a
1149  // definition), the vtable is defined elsewhere.
1152  return true;
1153 
1154  // Otherwise, if the class is an instantiated template, the
1155  // vtable must be defined here.
1156  if (TSK == TSK_ImplicitInstantiation ||
1158  return false;
1159 
1160  // Otherwise, if the class doesn't have a key function (possibly
1161  // anymore), the vtable must be defined here.
1162  const CXXMethodDecl *keyFunction = CGM.getContext().getCurrentKeyFunction(RD);
1163  if (!keyFunction)
1164  return false;
1165 
1166  // Otherwise, if we don't have a definition of the key function, the
1167  // vtable must be defined somewhere else.
1168  return !keyFunction->hasBody();
1169 }
1170 
1171 /// Given that we're currently at the end of the translation unit, and
1172 /// we've emitted a reference to the vtable for this class, should
1173 /// we define that vtable?
1175  const CXXRecordDecl *RD) {
1176  // If vtable is internal then it has to be done.
1177  if (!CGM.getVTables().isVTableExternal(RD))
1178  return true;
1179 
1180  // If it's external then maybe we will need it as available_externally.
1181  return shouldEmitAvailableExternallyVTable(CGM, RD);
1182 }
1183 
1184 /// Given that at some point we emitted a reference to one or more
1185 /// vtables, and that we are now at the end of the translation unit,
1186 /// decide whether we should emit them.
1187 void CodeGenModule::EmitDeferredVTables() {
1188 #ifndef NDEBUG
1189  // Remember the size of DeferredVTables, because we're going to assume
1190  // that this entire operation doesn't modify it.
1191  size_t savedSize = DeferredVTables.size();
1192 #endif
1193 
1194  for (const CXXRecordDecl *RD : DeferredVTables)
1196  VTables.GenerateClassData(RD);
1197  else if (shouldOpportunisticallyEmitVTables())
1198  OpportunisticVTables.push_back(RD);
1199 
1200  assert(savedSize == DeferredVTables.size() &&
1201  "deferred extra vtables during vtable emission?");
1202  DeferredVTables.clear();
1203 }
1204 
1206  if (RD->hasAttr<LTOVisibilityPublicAttr>() || RD->hasAttr<UuidAttr>())
1207  return true;
1208 
1209  if (!getCodeGenOpts().LTOVisibilityPublicStd)
1210  return false;
1211 
1212  const DeclContext *DC = RD;
1213  while (true) {
1214  auto *D = cast<Decl>(DC);
1215  DC = DC->getParent();
1216  if (isa<TranslationUnitDecl>(DC->getRedeclContext())) {
1217  if (auto *ND = dyn_cast<NamespaceDecl>(D))
1218  if (const IdentifierInfo *II = ND->getIdentifier())
1219  if (II->isStr("std") || II->isStr("stdext"))
1220  return true;
1221  break;
1222  }
1223  }
1224 
1225  return false;
1226 }
1227 
1230  if (!isExternallyVisible(LV.getLinkage()))
1231  return true;
1232 
1233  if (getTriple().isOSBinFormatCOFF()) {
1234  if (RD->hasAttr<DLLExportAttr>() || RD->hasAttr<DLLImportAttr>())
1235  return false;
1236  } else {
1237  if (LV.getVisibility() != HiddenVisibility)
1238  return false;
1239  }
1240 
1241  return !AlwaysHasLTOVisibilityPublic(RD);
1242 }
1243 
1244 llvm::GlobalObject::VCallVisibility CodeGenModule::GetVCallVisibilityLevel(
1246  // If we have already visited this RD (which means this is a recursive call
1247  // since the initial call should have an empty Visited set), return the max
1248  // visibility. The recursive calls below compute the min between the result
1249  // of the recursive call and the current TypeVis, so returning the max here
1250  // ensures that it will have no effect on the current TypeVis.
1251  if (!Visited.insert(RD).second)
1252  return llvm::GlobalObject::VCallVisibilityTranslationUnit;
1253 
1255  llvm::GlobalObject::VCallVisibility TypeVis;
1256  if (!isExternallyVisible(LV.getLinkage()))
1257  TypeVis = llvm::GlobalObject::VCallVisibilityTranslationUnit;
1258  else if (HasHiddenLTOVisibility(RD))
1259  TypeVis = llvm::GlobalObject::VCallVisibilityLinkageUnit;
1260  else
1261  TypeVis = llvm::GlobalObject::VCallVisibilityPublic;
1262 
1263  for (auto B : RD->bases())
1264  if (B.getType()->getAsCXXRecordDecl()->isDynamicClass())
1265  TypeVis = std::min(
1266  TypeVis,
1267  GetVCallVisibilityLevel(B.getType()->getAsCXXRecordDecl(), Visited));
1268 
1269  for (auto B : RD->vbases())
1270  if (B.getType()->getAsCXXRecordDecl()->isDynamicClass())
1271  TypeVis = std::min(
1272  TypeVis,
1273  GetVCallVisibilityLevel(B.getType()->getAsCXXRecordDecl(), Visited));
1274 
1275  return TypeVis;
1276 }
1277 
1279  llvm::GlobalVariable *VTable,
1280  const VTableLayout &VTLayout) {
1281  if (!getCodeGenOpts().LTOUnit)
1282  return;
1283 
1284  CharUnits PointerWidth = Context.toCharUnitsFromBits(
1286 
1287  typedef std::pair<const CXXRecordDecl *, unsigned> AddressPoint;
1288  std::vector<AddressPoint> AddressPoints;
1289  for (auto &&AP : VTLayout.getAddressPoints())
1290  AddressPoints.push_back(std::make_pair(
1291  AP.first.getBase(), VTLayout.getVTableOffset(AP.second.VTableIndex) +
1292  AP.second.AddressPointIndex));
1293 
1294  // Sort the address points for determinism.
1295  llvm::sort(AddressPoints, [this](const AddressPoint &AP1,
1296  const AddressPoint &AP2) {
1297  if (&AP1 == &AP2)
1298  return false;
1299 
1300  std::string S1;
1301  llvm::raw_string_ostream O1(S1);
1303  QualType(AP1.first->getTypeForDecl(), 0), O1);
1304  O1.flush();
1305 
1306  std::string S2;
1307  llvm::raw_string_ostream O2(S2);
1309  QualType(AP2.first->getTypeForDecl(), 0), O2);
1310  O2.flush();
1311 
1312  if (S1 < S2)
1313  return true;
1314  if (S1 != S2)
1315  return false;
1316 
1317  return AP1.second < AP2.second;
1318  });
1319 
1320  ArrayRef<VTableComponent> Comps = VTLayout.vtable_components();
1321  for (auto AP : AddressPoints) {
1322  // Create type metadata for the address point.
1323  AddVTableTypeMetadata(VTable, PointerWidth * AP.second, AP.first);
1324 
1325  // The class associated with each address point could also potentially be
1326  // used for indirect calls via a member function pointer, so we need to
1327  // annotate the address of each function pointer with the appropriate member
1328  // function pointer type.
1329  for (unsigned I = 0; I != Comps.size(); ++I) {
1330  if (Comps[I].getKind() != VTableComponent::CK_FunctionPointer)
1331  continue;
1332  llvm::Metadata *MD = CreateMetadataIdentifierForVirtualMemPtrType(
1333  Context.getMemberPointerType(
1334  Comps[I].getFunctionDecl()->getType(),
1335  Context.getRecordType(AP.first).getTypePtr()));
1336  VTable->addTypeMetadata((PointerWidth * I).getQuantity(), MD);
1337  }
1338  }
1339 
1340  if (getCodeGenOpts().VirtualFunctionElimination ||
1341  getCodeGenOpts().WholeProgramVTables) {
1343  llvm::GlobalObject::VCallVisibility TypeVis =
1344  GetVCallVisibilityLevel(RD, Visited);
1345  if (TypeVis != llvm::GlobalObject::VCallVisibilityPublic)
1346  VTable->setVCallVisibilityMetadata(TypeVis);
1347  }
1348 }
clang::CodeGen::ABIArgInfo::isDirect
bool isDirect() const
Definition: CGFunctionInfo.h:296
clang::CXXMethodDecl::getThisType
QualType getThisType() const
Return the type of the this pointer.
Definition: DeclCXX.cpp:2488
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:210
clang::GlobalDecl::getDtorType
CXXDtorType getDtorType() const
Definition: GlobalDecl.h:110
clang::Dtor_Base
@ Dtor_Base
Base object dtor.
Definition: ABI.h:36
clang::CodeGen::CGFunctionInfo::arg_size
unsigned arg_size() const
Definition: CGFunctionInfo.h:654
clang::HiddenVisibility
@ HiddenVisibility
Objects with "hidden" visibility are not seen by the dynamic linker.
Definition: Visibility.h:36
clang::CodeGen::CodeGenTypeCache::Int8PtrTy
llvm::PointerType * Int8PtrTy
Definition: CodeGenTypeCache.h:57
clang::VTableComponent::CK_VCallOffset
@ CK_VCallOffset
Definition: VTableBuilder.h:33
clang::CodeGen::CodeGenVTables::GenerateRelativeVTableAlias
void GenerateRelativeVTableAlias(llvm::GlobalVariable *VTable, llvm::StringRef AliasNameRef)
Generate a public facing alias for the vtable and make the vtable either hidden or private.
Definition: CGVTables.cpp:963
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
clang::CodeGen::CodeGenFunction::LoadCXXThis
llvm::Value * LoadCXXThis()
LoadCXXThis - Load the value of 'this'.
Definition: CodeGenFunction.h:2802
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:4207
clang::CodeGen::ConstantArrayBuilder
A helper class of ConstantInitBuilder, used for building constant array initializers.
Definition: ConstantInitBuilder.h:544
clang::CodeGen::CodeGenModule::getItaniumVTableContext
ItaniumVTableContext & getItaniumVTableContext()
Definition: CodeGenModule.h:753
clang::CodeGen::CodeGenFunction::AutoreleaseResult
bool AutoreleaseResult
In ARC, whether we should autorelease the return value.
Definition: CodeGenFunction.h:536
clang::CodeGen::ABIArgInfo::getKind
Kind getKind() const
Definition: CGFunctionInfo.h:295
clang::CodeGen::ConstantInitBuilder
The standard implementation of ConstantInitBuilder used in Clang.
Definition: ConstantInitBuilder.h:535
CodeGenFunction.h
string
string(SUBSTRING ${CMAKE_CURRENT_BINARY_DIR} 0 ${PATH_LIB_START} PATH_HEAD) string(SUBSTRING $
Definition: CMakeLists.txt:22
shouldEmitVTableAtEndOfTranslationUnit
static bool shouldEmitVTableAtEndOfTranslationUnit(CodeGenModule &CGM, const CXXRecordDecl *RD)
Given that we're currently at the end of the translation unit, and we've emitted a reference to the v...
Definition: CGVTables.cpp:1174
clang::DeclContext
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1389
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:4726
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:560
clang::CodeGen::CodeGenFunction::CurCodeDecl
const Decl * CurCodeDecl
CurCodeDecl - This is the inner-most code context, which includes blocks.
Definition: CodeGenFunction.h:322
clang::CodeGen::CGCXXABI::HasThisReturn
virtual bool HasThisReturn(GlobalDecl GD) const
Returns true if the given constructor or destructor is one of the kinds that the ABI says returns 'th...
Definition: CGCXXABI.h:127
clang::ItaniumVTableContext::isRelativeLayout
bool isRelativeLayout() const
Definition: VTableBuilder.h:437
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:4119
clang::NamedDecl::isExternallyVisible
bool isExternallyVisible() const
Definition: Decl.h:407
clang::CodeGen::CodeGenFunction::GenerateVarArgsThunk
llvm::Function * GenerateVarArgsThunk(llvm::Function *Fn, const CGFunctionInfo &FnInfo, GlobalDecl GD, const ThunkInfo &Thunk)
Definition: CGVTables.cpp:159
clang::ASTContext::VoidTy
CanQualType VoidTy
Definition: ASTContext.h:1107
llvm::SmallVector< llvm::Value *, 8 >
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::TargetCXXABI::isMicrosoft
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:138
clang::CodeGen::CGCXXABI::getMangleContext
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:117
clang::CodeGen::CodeGenModule::HasHiddenLTOVisibility
bool HasHiddenLTOVisibility(const CXXRecordDecl *RD)
Returns whether the given record has hidden LTO visibility and therefore may participate in (single-m...
Definition: CGVTables.cpp:1228
clang::TargetCXXABI::hasKeyFunctions
bool hasKeyFunctions() const
Does this ABI use key functions? If so, class data such as the vtable is emitted with strong linkage ...
Definition: TargetCXXABI.h:208
clang::VTableLayout::getNumVTables
size_t getNumVTables() const
Definition: VTableBuilder.h:293
CXXInheritance.h
clang::MangleContext::mangleThunk
virtual void mangleThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk, raw_ostream &)=0
clang::TSK_Undeclared
@ TSK_Undeclared
This template specialization was formed from a template-id but has not yet been declared,...
Definition: Specifiers.h:179
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:737
Attr.h
clang::CodeGen::CodeGenVTables::GenerateConstructionVTable
llvm::GlobalVariable * GenerateConstructionVTable(const CXXRecordDecl *RD, const BaseSubobject &Base, bool BaseIsVirtual, llvm::GlobalVariable::LinkageTypes Linkage, VTableAddressPointsMapTy &AddressPoints)
GenerateConstructionVTable - Generate a construction vtable for the given base subobject.
Definition: CGVTables.cpp:864
clang::SanitizerSet::has
bool has(SanitizerMask K) const
Check if a certain (single) sanitizer is enabled.
Definition: Sanitizers.h:155
clang::CodeGen::CodeGenModule::getContext
ASTContext & getContext() const
Definition: CodeGenModule.h:722
clang::CodeGen::CodeGenModule::AlwaysHasLTOVisibilityPublic
bool AlwaysHasLTOVisibilityPublic(const CXXRecordDecl *RD)
Returns whether the given record has public LTO visibility (regardless of -lto-whole-program-visibili...
Definition: CGVTables.cpp:1205
clang::CodeGen::CGFunctionInfo::arg_begin
const_arg_iterator arg_begin() const
Definition: CGFunctionInfo.h:649
clang::CodeGen::ABIArgInfo::isSRetAfterThis
bool isSRetAfterThis() const
Definition: CGFunctionInfo.h:426
clang::TargetInfo::getCXXABI
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:1274
clang::TargetCXXABI::isItaniumFamily
bool isItaniumFamily() const
Does this ABI generally fall into the Itanium family of ABIs?
Definition: TargetCXXABI.h:124
clang::ParmVarDecl
Represents a parameter to a function.
Definition: Decl.h:1712
clang::CodeGen::CodeGenFunction::generateThunk
void generateThunk(llvm::Function *Fn, const CGFunctionInfo &FnInfo, GlobalDecl GD, const ThunkInfo &Thunk, bool IsUnprototyped)
Generate a thunk for the given method.
Definition: CGVTables.cpp:449
clang::CodeGen::ABIArgInfo::isInAlloca
bool isInAlloca() const
Definition: CGFunctionInfo.h:297
clang::CXXMethodDecl::getCanonicalDecl
CXXMethodDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:2068
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:2428
clang::CodeGen::CGBuilderTy::CreateStore
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:99
clang::CodeGen::ConstantAggregateBuilderTemplateBase::beginArray
ArrayBuilder beginArray(llvm::Type *eltTy=nullptr)
Definition: ConstantInitBuilder.h:362
clang::codegenoptions::NoDebugInfo
@ NoDebugInfo
Don't generate debug info.
Definition: DebugInfoOptions.h:22
clang::NamedDecl::getLinkageAndVisibility
LinkageInfo getLinkageAndVisibility() const
Determines the linkage and visibility of this entity.
Definition: Decl.cpp:1166
clang::CodeGen::CodeGenVTables::CodeGenVTables
CodeGenVTables(CodeGenModule &CGM)
Definition: CGVTables.cpp:31
clang::CodeGen::CodeGenModule::SetLLVMFunctionAttributes
void SetLLVMFunctionAttributes(GlobalDecl GD, const CGFunctionInfo &Info, llvm::Function *F, bool IsThunk)
Set the LLVM function attributes (sext, zext, etc).
Definition: CodeGenModule.cpp:1691
clang::CodeGen::CodeGenModule::getLangOpts
const LangOptions & getLangOpts() const
Definition: CodeGenModule.h:723
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:7180
clang::QualType::isVolatileQualified
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6705
clang::CodeGen::ConstantStructBuilder
A helper class of ConstantInitBuilder, used for building constant struct initializers.
Definition: ConstantInitBuilder.h:561
clang::VTableComponent::CK_RTTI
@ CK_RTTI
Definition: VTableBuilder.h:36
clang::VTableLayout::vtable_components
ArrayRef< VTableComponent > vtable_components() const
Definition: VTableBuilder.h:272
clang::CodeGen::CGFunctionInfo::isNoReturn
bool isNoReturn() const
Definition: CGFunctionInfo.h:668
clang::ASTContext::getCurrentKeyFunction
const CXXMethodDecl * getCurrentKeyFunction(const CXXRecordDecl *RD)
Get our current best idea for the key function of the given record decl, or nullptr if there isn't on...
Definition: RecordLayoutBuilder.cpp:3367
clang::FunctionType
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3675
clang::CodeGen::CGFunctionInfo::isVariadic
bool isVariadic() const
Definition: CGFunctionInfo.h:656
shouldEmitAvailableExternallyVTable
static bool shouldEmitAvailableExternallyVTable(const CodeGenModule &CGM, const CXXRecordDecl *RD)
Definition: CGVTables.cpp:1013
clang::CodeGen::CGFunctionInfo::getReturnType
CanQualType getReturnType() const
Definition: CGFunctionInfo.h:709
clang::CodeGen::CallArgList::add
void add(RValue rvalue, QualType type)
Definition: CGCall.h:283
clang::CodeGen::CodeGenFunction::Builder
CGBuilderTy Builder
Definition: CodeGenFunction.h:269
clang::CodeGen::CodeGenModule::ConstructAttributeList
void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info, CGCalleeInfo CalleeInfo, llvm::AttributeList &Attrs, unsigned &CallingConv, bool AttrOnCallSite, bool IsThunk)
Get the LLVM attributes and calling convention to use for a particular function type.
Definition: CGCall.cpp:2094
clang::VTableLayout::vtable_thunks
ArrayRef< VTableThunkTy > vtable_thunks() const
Definition: VTableBuilder.h:276
clang::CodeGen::CodeGenFunction::StartThunk
void StartThunk(llvm::Function *Fn, GlobalDecl GD, const CGFunctionInfo &FnInfo, bool IsUnprototyped)
Definition: CGVTables.cpp:240
clang::FunctionDecl::isInlined
bool isInlined() const
Determine whether this function should be inlined, because it is either marked "inline" or "constexpr...
Definition: Decl.h:2701
clang::CodeGen::CodeGenFunction::GetAddrOfLocalVar
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
Definition: CodeGenFunction.h:2718
clang::VTableComponent::CK_UnusedFunctionPointer
@ CK_UnusedFunctionPointer
An entry that is never used.
Definition: VTableBuilder.h:50
clang::GlobalDecl
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:56
clang::VTableLayout::getVTableOffset
size_t getVTableOffset(size_t i) const
Definition: VTableBuilder.h:299
clang::VTableContextBase::getThunkInfo
virtual const ThunkInfoVectorTy * getThunkInfo(GlobalDecl GD)
Definition: VTableBuilder.h:342
CodeGenOptions.h
clang::CodeGen::ABIArgInfo
ABIArgInfo - Helper class to encapsulate information about how a specific C type should be passed to ...
Definition: CGFunctionInfo.h:32
clang::CodeGen::ReturnValueSlot
ReturnValueSlot - Contains the address where the return value of a function can be stored,...
Definition: CGCall.h:357
clang::CodeGen::CGCXXABI::emitVirtualInheritanceTables
virtual void emitVirtualInheritanceTables(const CXXRecordDecl *RD)=0
Emit any tables needed to implement virtual inheritance.
clang::CodeGen::CGFunctionInfo::getCallingConvention
unsigned getCallingConvention() const
getCallingConvention - Return the user specified calling convention, which has been translated into a...
Definition: CGFunctionInfo.h:688
clang::CodeGen::CGCXXABI::buildThisParam
void buildThisParam(CodeGenFunction &CGF, FunctionArgList &Params)
Build a parameter variable suitable for 'this'.
Definition: CGCXXABI.cpp:121
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6895
clang::MangleContext::mangleCXXDtorThunk
virtual void mangleCXXDtorThunk(const CXXDestructorDecl *DD, CXXDtorType Type, const ThisAdjustment &ThisAdjustment, raw_ostream &)=0
clang::TSK_ExplicitInstantiationDeclaration
@ TSK_ExplicitInstantiationDeclaration
This template specialization was instantiated from a template due to an explicit instantiation declar...
Definition: Specifiers.h:190
clang::CodeGen::CodeGenModule::SetLLVMFunctionAttributesForDefinition
void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F)
Set the LLVM function attributes which only apply to a function definition.
Definition: CodeGenModule.cpp:1956
min
__DEVICE__ int min(int __a, int __b)
Definition: __clang_cuda_math.h:197
clang::MangleContext
MangleContext - Context for tracking state which persists across multiple calls to the C++ name mangl...
Definition: Mangle.h:44
clang::CodeGen::CodeGenVTables::EmitThunks
void EmitThunks(GlobalDecl GD)
EmitThunks - Emit the associated thunks for the given global decl.
Definition: CGVTables.cpp:607
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::FunctionDecl::param_end
param_iterator param_end()
Definition: Decl.h:2584
clang::CodeGen::CodeGenModule::getClassPointerAlignment
CharUnits getClassPointerAlignment(const CXXRecordDecl *CD)
Returns the assumed alignment of an opaque pointer to the given class.
Definition: CGClass.cpp:38
clang::BaseSubobject
Definition: BaseSubobject.h:30
clang::CodeGen::CodeGenVTables::GenerateClassData
void GenerateClassData(const CXXRecordDecl *RD)
GenerateClassData - Generate all the class data required to be generated upon definition of a KeyFunc...
Definition: CGVTables.cpp:1120
clang::TargetInfo::getPointerWidth
uint64_t getPointerWidth(LangAS AddrSpace) const
Return the width of pointers on this target, for the specified address space.
Definition: TargetInfo.h:442
clang::CodeGen::CodeGenModule::ReturnTypeUsesSRet
bool ReturnTypeUsesSRet(const CGFunctionInfo &FI)
Return true iff the given type uses 'sret' when used as a return type.
Definition: CGCall.cpp:1571
clang::CodeGen::CodeGenModule::getCodeGenOpts
const CodeGenOptions & getCodeGenOpts() const
Definition: CodeGenModule.h:731
CGFunctionInfo.h
clang::VTableComponent::CK_FunctionPointer
@ CK_FunctionPointer
Definition: VTableBuilder.h:37
clang::CodeGen::CGCXXABI::performReturnAdjustment
virtual llvm::Value * performReturnAdjustment(CodeGenFunction &CGF, Address Ret, const ReturnAdjustment &RA)=0
clang::VTableComponent::CK_DeletingDtorPointer
@ CK_DeletingDtorPointer
A pointer to the deleting destructor.
Definition: VTableBuilder.h:43
clang::CodeGen::CodeGenFunction::EmitCallAndReturnForThunk
void EmitCallAndReturnForThunk(llvm::FunctionCallee Callee, const ThunkInfo *Thunk, bool IsUnprototyped)
Definition: CGVTables.cpp:296
clang::CodeGen::CodeGenTypeCache::VoidTy
llvm::Type * VoidTy
void
Definition: CodeGenTypeCache.h:34
clang::VTableLayout::getAddressPointIndices
const AddressPointsIndexMapTy & getAddressPointIndices() const
Definition: VTableBuilder.h:289
clang::isExternallyVisible
bool isExternallyVisible(Linkage L)
Definition: Linkage.h:91
clang::CodeGen::CodeGenModule::getModule
llvm::Module & getModule() const
Definition: CodeGenModule.h:732
clang::CodeGen::CodeGenTypes::GetFunctionTypeForVTable
llvm::Type * GetFunctionTypeForVTable(GlobalDecl GD)
GetFunctionTypeForVTable - Get the LLVM function type for use in a vtable, given a CXXMethodDecl.
Definition: CGCall.cpp:1749
clang::CXXDestructorDecl
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2703
clang::CodeGen::CGDebugInfo
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:55
clang::MangleContext::mangleTypeName
virtual void mangleTypeName(QualType T, raw_ostream &)=0
Generates a unique string for an externally visible type for use with TBAA or type uniquing.
clang::VTableComponent::CK_VBaseOffset
@ CK_VBaseOffset
Definition: VTableBuilder.h:34
clang::CodeGen::CGCXXABI::performThisAdjustment
virtual llvm::Value * performThisAdjustment(CodeGenFunction &CGF, Address This, const ThisAdjustment &TA)=0
clang::CodeGen::CodeGenModule::setFunctionLinkage
void setFunctionLinkage(GlobalDecl GD, llvm::Function *F)
Definition: CodeGenModule.h:1292
llvm::SmallString
Definition: LLVM.h:37
clang::ASTContext::getRecordType
QualType getRecordType(const RecordDecl *Decl) const
Definition: ASTContext.cpp:4759
clang::CallingConv
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:266
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::LinkageInfo
Definition: Visibility.h:52
clang::TSK_ExplicitInstantiationDefinition
@ TSK_ExplicitInstantiationDefinition
This template specialization was instantiated from a template due to an explicit instantiation defini...
Definition: Specifiers.h:194
clang::VTableComponent::CK_CompleteDtorPointer
@ CK_CompleteDtorPointer
A pointer to the complete destructor.
Definition: VTableBuilder.h:40
clang::CodeGen::CodeGenModule::getTypes
CodeGenTypes & getTypes()
Definition: CodeGenModule.h:749
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:1760
clang::CXXRecordDecl::bases
base_class_range bases()
Definition: DeclCXX.h:597
clang::CodeGen::CodeGenFunction::getLLVMContext
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenFunction.h:2027
clang::CodeGen::ABIArgInfo::Indirect
@ Indirect
Indirect - Pass the argument indirectly via a hidden pointer with the specified alignment (0 indicate...
Definition: CGFunctionInfo.h:49
clang::CodeGen::CodeGenFunction::FinishFunction
void FinishFunction(SourceLocation EndLoc=SourceLocation())
FinishFunction - Complete IR generation of the current function.
Definition: CodeGenFunction.cpp:327
clang::CanQual< Type >
clang::CodeGen::Address
An aligned address.
Definition: Address.h:74
Base
clang::FunctionDecl::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine what kind of template instantiation this function represents.
Definition: Decl.cpp:4019
CodeGenModule.h
clang::ThunkInfo::This
ThisAdjustment This
The this pointer adjustment.
Definition: Thunk.h:158
getKind
static Decl::Kind getKind(const Decl *D)
Definition: DeclBase.cpp:1024
clang::CodeGen::CodeGenModule::EmitVTableTypeMetadata
void EmitVTableTypeMetadata(const CXXRecordDecl *RD, llvm::GlobalVariable *VTable, const VTableLayout &VTLayout)
Emit type metadata for the given vtable using the given layout.
Definition: CGVTables.cpp:1278
clang::CXXRecordDecl::vbases
base_class_range vbases()
Definition: DeclCXX.h:614
clang::CodeGen::ConstantInitBuilderTemplateBase::beginStruct
StructBuilder beginStruct(llvm::StructType *structTy=nullptr)
Definition: ConstantInitBuilder.h:518
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:840
clang::CodeGen::CGCallee::forDirect
static CGCallee forDirect(llvm::Constant *functionPtr, const CGCalleeInfo &abstractInfo=CGCalleeInfo())
Definition: CGCall.h:130
clang::LinkageInfo::getVisibility
Visibility getVisibility() const
Definition: Visibility.h:84
clang::CodeGen::CodeGenVTables::RemoveHwasanMetadata
void RemoveHwasanMetadata(llvm::GlobalValue *GV) const
Specify a global should not be instrumented with hwasan.
Definition: CGVTables.cpp:947
clang::CodeGen::CodeGenTypes::isFuncTypeConvertible
bool isFuncTypeConvertible(const FunctionType *FT)
isFuncTypeConvertible - Utility to check whether a function type can be converted to an LLVM type (i....
Definition: CodeGenTypes.cpp:249
clang::CodeGen::CodeGenModule::getTarget
const TargetInfo & getTarget() const
Definition: CodeGenModule.h:737
clang::CodeGen::CodeGenFunction::CurGD
GlobalDecl CurGD
CurGD - The GlobalDecl for the current function being compiled.
Definition: CodeGenFunction.h:345
clang::VTableLayout::getAddressPoints
const AddressPointsMapTy & getAddressPoints() const
Definition: VTableBuilder.h:285
clang::CodeGen::CodeGenTypeCache::Int32Ty
llvm::IntegerType * Int32Ty
Definition: CodeGenTypeCache.h:37
resolveTopLevelMetadata
static void resolveTopLevelMetadata(llvm::Function *Fn, llvm::ValueToValueMapTy &VMap)
This function clones a function's DISubprogram node and enters it into a value map with the intent th...
Definition: CGVTables.cpp:120
clang::FunctionDecl::hasBody
bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:3036
clang::CodeGen::CodeGenModule::getModuleDebugInfo
CGDebugInfo * getModuleDebugInfo()
Definition: CodeGenModule.h:714
clang::LangOptions::Sanitize
SanitizerSet Sanitize
Set of enabled sanitizers.
Definition: LangOptions.h:385
clang::CodeGen::CodeGenTypes::GetFunctionType
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1615
clang::CodeGen::CodeGenModule::getDataLayout
const llvm::DataLayout & getDataLayout() const
Definition: CodeGenModule.h:734
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7453
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:689
clang::ThunkInfo::Return
ReturnAdjustment Return
The return adjustment.
Definition: Thunk.h:161
clang::CodeGen::CodeGenTypes::arrangeCXXMethodCall
const CGFunctionInfo & arrangeCXXMethodCall(const CallArgList &args, const FunctionProtoType *type, RequiredArgs required, unsigned numPrefixArgs)
Arrange a call to a C++ method, passing the given arguments.
Definition: CGCall.cpp:690
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:254
clang::VTableLayout::getVTableSize
size_t getVTableSize(size_t i) const
Definition: VTableBuilder.h:307
PerformReturnAdjustment
static RValue PerformReturnAdjustment(CodeGenFunction &CGF, QualType ResultType, RValue RV, const ThunkInfo &Thunk)
Definition: CGVTables.cpp:69
AddRelativeLayoutOffset
static void AddRelativeLayoutOffset(const CodeGenModule &CGM, ConstantArrayBuilder &builder, CharUnits offset)
Definition: CGVTables.cpp:700
clang::DeclContext::getRedeclContext
DeclContext * getRedeclContext()
getRedeclContext - Retrieve the context in which an entity conflicts with other entities of the same ...
Definition: DeclBase.cpp:1828
clang::TemplateSpecializationKind
TemplateSpecializationKind
Describes the kind of template specialization that a particular template specialization declaration r...
Definition: Specifiers.h:176
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::CodeGen::CodeGenFunction::EmitDelegateCallArg
void EmitDelegateCallArg(CallArgList &args, const VarDecl *param, SourceLocation loc)
EmitDelegateCallArg - We are performing a delegate call; that is, the current function is delegating ...
Definition: CGCall.cpp:3799
clang::ASTContext::VoidPtrTy
CanQualType VoidPtrTy
Definition: ASTContext.h:1134
clang::CodeGen::CGCXXABI::addImplicitStructorParams
virtual void addImplicitStructorParams(CodeGenFunction &CGF, QualType &ResTy, FunctionArgList &Params)=0
Insert any ABI-specific implicit parameters into the parameter list for a function.
clang::ReturnAdjustment::isEmpty
bool isEmpty() const
Definition: Thunk.h:69
clang::CodeGen::CodeGenTypes::arrangeUnprototypedMustTailThunk
const CGFunctionInfo & arrangeUnprototypedMustTailThunk(const CXXMethodDecl *MD)
Arrange a thunk that takes 'this' as the first parameter followed by varargs.
Definition: CGCall.cpp:545
clang::CXXRecordDecl::getNumVBases
unsigned getNumVBases() const
Retrieves the number of virtual base classes of this class.
Definition: DeclCXX.h:612
clang::CodeGen::ABIArgInfo::isIndirect
bool isIndirect() const
Definition: CGFunctionInfo.h:300
clang::CodeGen::Address::getPointer
llvm::Value * getPointer() const
Definition: Address.h:93
clang::CodeGen::CodeGenModule::ErrorUnsupported
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn't support the specified stmt yet.
Definition: CodeGenModule.cpp:1075
clang::CodeGen::CodeGenModule::CreateMetadataIdentifierForVirtualMemPtrType
llvm::Metadata * CreateMetadataIdentifierForVirtualMemPtrType(QualType T)
Create a metadata identifier that is intended to be used to check virtual calls via a member function...
Definition: CodeGenModule.cpp:6848
clang::CodeGen::CodeGenFunction
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Definition: CodeGenFunction.h:231
AddPointerLayoutOffset
static void AddPointerLayoutOffset(const CodeGenModule &CGM, ConstantArrayBuilder &builder, CharUnits offset)
Definition: CGVTables.cpp:692
clang::CodeGen::CGCXXABI::setThunkLinkage
virtual void setThunkLinkage(llvm::Function *Thunk, bool ForVTable, GlobalDecl GD, bool ReturnAdjustment)=0
clang::CodeGen::CodeGenTypeCache::PtrDiffTy
llvm::IntegerType * PtrDiffTy
Definition: CodeGenTypeCache.h:51
clang::CodeGen::CodeGenModule::getCXXABI
CGCXXABI & getCXXABI() const
Definition: CodeGenModule.h:742
clang::ASTContext::getTagDeclType
QualType getTagDeclType(const TagDecl *Decl) const
Return the unique reference to the type for the specified TagDecl (struct/union/class/enum) decl.
Definition: ASTContext.cpp:5923
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:4016
clang::DeclContext::getParent
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1923
clang::CodeGen::CodeGenModule
This class organizes the cross-function state that is used while generating LLVM code.
Definition: CodeGenModule.h:279
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:6779
llvm::ArrayRef
Definition: LLVM.h:34
clang::CodeGen::CodeGenModule::getVTables
CodeGenVTables & getVTables()
Definition: CodeGenModule.h:751
clang::VTableComponent::CK_OffsetToTop
@ CK_OffsetToTop
Definition: VTableBuilder.h:35
clang::CodeGen::CodeGenModule::getTriple
const llvm::Triple & getTriple() const
Definition: CodeGenModule.h:738
clang::ThunkInfo
The this pointer adjustment as well as an optional return adjustment for a thunk.
Definition: Thunk.h:156
clang::CodeGen::CGFunctionInfo::usesInAlloca
bool usesInAlloca() const
Return true if this function uses inalloca arguments.
Definition: CGFunctionInfo.h:725
clang::CodeGen::CGCXXABI::GetDeletedVirtualCallName
virtual StringRef GetDeletedVirtualCallName()=0
Gets the deleted virtual member call name.
clang::CodeGen::FunctionArgList
FunctionArgList - Type for representing both the decl and type of parameters to a function.
Definition: CGCall.h:353
clang::CodeGen::CGFunctionInfo::getReturnInfo
ABIArgInfo & getReturnInfo()
Definition: CGFunctionInfo.h:711
clang::LinkageInfo::getLinkage
Linkage getLinkage() const
Definition: Visibility.h:83
clang::TSK_ExplicitSpecialization
@ TSK_ExplicitSpecialization
This template specialization was declared or defined by an explicit specialization (C++ [temp....
Definition: Specifiers.h:186
clang::CodeGen::CGCXXABI::hasMostDerivedReturn
virtual bool hasMostDerivedReturn(GlobalDecl GD) const
Definition: CGCXXABI.h:135
clang::CodeGen::CGCXXABI::EmitReturnFromThunk
virtual void EmitReturnFromThunk(CodeGenFunction &CGF, RValue RV, QualType ResultType)
Definition: CGCXXABI.cpp:201
clang::CodeGen::CodeGenModule::EmitVTable
void EmitVTable(CXXRecordDecl *Class)
This is a callback from Sema to tell us that a particular vtable is required to be emitted in this tr...
Definition: CGVTables.cpp:1115
clang::CodeGen::CodeGenFunction::hasAggregateEvaluationKind
static bool hasAggregateEvaluationKind(QualType T)
Definition: CodeGenFunction.h:2423
clang::CodeGen::Address::getElementType
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:104
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:85
clang::CodeGen::CodeGenVTables::getVTableType
llvm::Type * getVTableType(const VTableLayout &layout)
Returns the type of a vtable with the given layout.
Definition: CGVTables.cpp:831
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:773
clang::CodeGen::CodeGenFunction::FinishThunk
void FinishThunk()
Definition: CGVTables.cpp:287
clang::CodeGen::CodeGenModule::supportsCOMDAT
bool supportsCOMDAT() const
Definition: TargetInfo.cpp:12064
clang::CodeGen::CGFunctionInfo
CGFunctionInfo - Class to encapsulate the information about a function definition.
Definition: CGFunctionInfo.h:546
clang::CodeGen::CodeGenModule::GetVCallVisibilityLevel
llvm::GlobalObject::VCallVisibility GetVCallVisibilityLevel(const CXXRecordDecl *RD, llvm::DenseSet< const CXXRecordDecl * > &Visited)
Returns the vcall visibility of the given type.
Definition: CGVTables.cpp:1244
CGCXXABI.h
similar
static bool similar(const ABIArgInfo &infoL, CanQualType typeL, const ABIArgInfo &infoR, CanQualType typeR)
Definition: CGVTables.cpp:60
clang::LangAS::Default
@ Default
clang::CodeGen::RequiredArgs::forPrototypePlus
static RequiredArgs forPrototypePlus(const FunctionProtoType *prototype, unsigned additional)
Compute the arguments required by the given formal prototype, given that there may be some additional...
Definition: CGFunctionInfo.h:497
clang::CodeGen::CodeGenFunction::CGM
CodeGenModule & CGM
Definition: CodeGenFunction.h:261
clang::VTableLayout
Definition: VTableBuilder.h:233
clang::Builtin::ID
ID
Definition: Builtins.h:52
clang::CodeGen::CodeGenFunction::CurFn
llvm::Function * CurFn
Definition: CodeGenFunction.h:325
clang::CodeGen::CodeGenTypes::arrangeGlobalDeclaration
const CGFunctionInfo & arrangeGlobalDeclaration(GlobalDecl GD)
Definition: CGCall.cpp:528
clang::CXXRecordDecl::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine whether this particular class is a specialization or instantiation of a class template or m...
Definition: DeclCXX.cpp:1847
clang
Definition: CalledOnceCheck.h:17
clang::CodeGen::RValue::get
static RValue get(llvm::Value *V)
Definition: CGValue.h:89
clang::ASTContext::toCharUnitsFromBits
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Definition: ASTContext.cpp:2504
clang::CodeGen::CodeGenModule::getVTableLinkage
llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD)
Return the appropriate linkage for the vtable, VTT, and type information of the given class.
Definition: CGVTables.cpp:1023
clang::CodeGen::ApplyDebugLocation::CreateArtificial
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF)
Apply TemporaryLocation if it is valid.
Definition: CGDebugInfo.h:829
clang::ExternalLinkage
@ ExternalLinkage
External linkage, which indicates that the entity can be referred to from other translation units.
Definition: Linkage.h:59
clang::CodeGen::CGCXXABI::canSpeculativelyEmitVTable
virtual bool canSpeculativelyEmitVTable(const CXXRecordDecl *RD) const =0
Determine whether it's possible to emit a vtable for RD, even though we do not know that the vtable h...
clang::FunctionType::getReturnType
QualType getReturnType() const
Definition: Type.h:3940
clang::CodeGen::CGCXXABI::EmitInstanceFunctionProlog
virtual void EmitInstanceFunctionProlog(CodeGenFunction &CGF)=0
Emit the ABI-specific prolog for the function.
clang::CodeGen::RValue::getScalarVal
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:61
clang::CodeGen::ApplyDebugLocation::CreateEmpty
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:846
clang::CodeGen::CodeGenFunction::CurFuncIsThunk
bool CurFuncIsThunk
In C++, whether we are code generating a thunk.
Definition: CodeGenFunction.h:533
clang::FunctionDecl::param_begin
param_iterator param_begin()
Definition: Decl.h:2583
clang::CodeGen::CGCXXABI::emitVTableDefinitions
virtual void emitVTableDefinitions(CodeGenVTables &CGVT, const CXXRecordDecl *RD)=0
Emits the VTable definitions required for the given record type.
clang::CodeGen::CGFunctionInfo::getRegParm
unsigned getRegParm() const
Definition: CGFunctionInfo.h:700
clang::GlobalDecl::getDecl
const Decl * getDecl() const
Definition: GlobalDecl.h:103
clang::QualType::getTypePtr
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6622
clang::CXXRecordDecl::isDynamicClass
bool isDynamicClass() const
Definition: DeclCXX.h:563
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::CodeGen::CodeGenVTables::isVTableExternal
bool isVTableExternal(const CXXRecordDecl *RD)
At this point in the translation unit, does it appear that can we rely on the vtable being defined el...
Definition: CGVTables.cpp:1140
clang::CodeGen::CodeGenModule::GetAddrOfThunk
llvm::Constant * GetAddrOfThunk(StringRef Name, llvm::Type *FnTy, GlobalDecl GD)
Get the address of the thunk for the given global decl.
Definition: CGVTables.cpp:34
clang::CodeGen::CodeGenFunction::CurFnInfo
const CGFunctionInfo * CurFnInfo
Definition: CodeGenFunction.h:323
clang::ValueDecl::getType
QualType getType() const
Definition: Decl.h:712
clang::CodeGen::CodeGenFunction::LoadCXXThisAddress
Address LoadCXXThisAddress()
Definition: CGClass.cpp:128
clang::CodeGen::CodeGenVTables::getItaniumVTableContext
ItaniumVTableContext & getItaniumVTableContext()
Definition: CGVTables.h:101
clang::CodeGen::CGCXXABI::adjustCallArgsForDestructorThunk
virtual void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, GlobalDecl GD, CallArgList &CallArgs)
Definition: CGCXXABI.h:496
clang::CodeGen::CodeGenModule::CreateOrReplaceCXXRuntimeVariable
llvm::GlobalVariable * CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty, llvm::GlobalValue::LinkageTypes Linkage, unsigned Alignment)
Will return a global variable of the given type.
Definition: CodeGenModule.cpp:4498
clang::CodeGen::CodeGenModule::setGVProperties
void setGVProperties(llvm::GlobalValue *GV, GlobalDecl GD) const
Set visibility, dllimport/dllexport and dso_local.
Definition: CodeGenModule.cpp:1256
clang::CodeGen::ReturnValueSlot::isNull
bool isNull() const
Definition: CGCall.h:373
clang::CodeGen::CGCXXABI::exportThunk
virtual bool exportThunk()=0
clang::transformer::name
RangeSelector name(std::string ID)
Given a node with a "name", (like NamedDecl, DeclRefExpr, CxxCtorInitializer, and TypeLoc) selects th...
Definition: RangeSelector.cpp:200
clang::TSK_ImplicitInstantiation
@ TSK_ImplicitInstantiation
This template specialization was implicitly instantiated from a template.
Definition: Specifiers.h:182
shouldEmitVTableThunk
static bool shouldEmitVTableThunk(CodeGenModule &CGM, const CXXMethodDecl *MD, bool IsUnprototyped, bool ForVTable)
Definition: CGVTables.cpp:476
clang::CodeGen::CGCXXABI::GetPureVirtualCallName
virtual StringRef GetPureVirtualCallName()=0
Gets the pure virtual member call function.
clang::FunctionDecl::parameters
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2571
clang::CodeGen::CodeGenModule::AddVTableTypeMetadata
void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset, const CXXRecordDecl *RD)
Create and attach type metadata for the given vtable.
Definition: CodeGenModule.cpp:6903
clang::Decl::getLocation
SourceLocation getLocation() const
Definition: DeclBase.h:432
clang::CodeGen::CallArgList
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:259
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1904
clang::CodeGen::CodeGenFunction::EmitBlock
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:563
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:3083
clang::ASTContext::getLangOpts
const LangOptions & getLangOpts() const
Definition: ASTContext.h:791
clang::CodeGen::CodeGenModule::getLLVMContext
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenModule.h:743
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
ConstantInitBuilder.h
setThunkProperties
static void setThunkProperties(CodeGenModule &CGM, const ThunkInfo &Thunk, llvm::Function *ThunkFn, bool ForVTable, GlobalDecl GD)
Definition: CGVTables.cpp:40
RecordLayout.h
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:3543
clang::CodeGen::CodeGenFunction::CurFuncDecl
const Decl * CurFuncDecl
CurFuncDecl - Holds the Decl for the current outermost non-closure context.
Definition: CodeGenFunction.h:320
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:2098
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1983
clang::CodeGen::CodeGenFunction::ReturnValue
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
Definition: CodeGenFunction.h:356