1 //===--- CGDeclCXX.cpp - Emit LLVM Code for C++ declarations --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This contains code dealing with code generation of C++ declarations
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
16 #include "CGObjCRuntime.h"
17 #include "CGOpenMPRuntime.h"
18 #include "clang/Frontend/CodeGenOptions.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/IR/Intrinsics.h"
21 #include "llvm/Support/Path.h"
23 using namespace clang;
24 using namespace CodeGen;
26 static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
27 ConstantAddress DeclPtr) {
28 assert(D.hasGlobalStorage() && "VarDecl must have global storage!");
29 assert(!D.getType()->isReferenceType() &&
30 "Should not call EmitDeclInit on a reference!");
32 QualType type = D.getType();
33 LValue lv = CGF.MakeAddrLValue(DeclPtr, type);
35 const Expr *Init = D.getInit();
36 switch (CGF.getEvaluationKind(type)) {
38 CodeGenModule &CGM = CGF.CGM;
39 if (lv.isObjCStrong())
40 CGM.getObjCRuntime().EmitObjCGlobalAssign(CGF, CGF.EmitScalarExpr(Init),
41 DeclPtr, D.getTLSKind());
42 else if (lv.isObjCWeak())
43 CGM.getObjCRuntime().EmitObjCWeakAssign(CGF, CGF.EmitScalarExpr(Init),
46 CGF.EmitScalarInit(Init, &D, lv, false);
50 CGF.EmitComplexExprIntoLValue(Init, lv, /*isInit*/ true);
53 CGF.EmitAggExpr(Init, AggValueSlot::forLValue(lv,AggValueSlot::IsDestructed,
54 AggValueSlot::DoesNotNeedGCBarriers,
55 AggValueSlot::IsNotAliased));
58 llvm_unreachable("bad evaluation kind");
61 /// Emit code to cause the destruction of the given variable with
62 /// static storage duration.
63 static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
64 ConstantAddress addr) {
65 CodeGenModule &CGM = CGF.CGM;
67 // FIXME: __attribute__((cleanup)) ?
69 QualType type = D.getType();
70 QualType::DestructionKind dtorKind = type.isDestructedType();
73 case QualType::DK_none:
76 case QualType::DK_cxx_destructor:
79 case QualType::DK_objc_strong_lifetime:
80 case QualType::DK_objc_weak_lifetime:
81 // We don't care about releasing objects during process teardown.
82 assert(!D.getTLSKind() && "should have rejected this");
86 llvm::Constant *function;
87 llvm::Constant *argument;
89 // Special-case non-array C++ destructors, if they have the right signature.
90 // Under some ABIs, destructors return this instead of void, and cannot be
91 // passed directly to __cxa_atexit if the target does not allow this mismatch.
92 const CXXRecordDecl *Record = type->getAsCXXRecordDecl();
93 bool CanRegisterDestructor =
94 Record && (!CGM.getCXXABI().HasThisReturn(
95 GlobalDecl(Record->getDestructor(), Dtor_Complete)) ||
96 CGM.getCXXABI().canCallMismatchedFunctionType());
97 // If __cxa_atexit is disabled via a flag, a different helper function is
98 // generated elsewhere which uses atexit instead, and it takes the destructor
100 bool UsingExternalHelper = !CGM.getCodeGenOpts().CXAAtExit;
101 if (Record && (CanRegisterDestructor || UsingExternalHelper)) {
102 assert(!Record->hasTrivialDestructor());
103 CXXDestructorDecl *dtor = Record->getDestructor();
105 function = CGM.getAddrOfCXXStructor(dtor, StructorType::Complete);
106 argument = llvm::ConstantExpr::getBitCast(
107 addr.getPointer(), CGF.getTypes().ConvertType(type)->getPointerTo());
109 // Otherwise, the standard logic requires a helper function.
111 function = CodeGenFunction(CGM)
112 .generateDestroyHelper(addr, type, CGF.getDestroyer(dtorKind),
113 CGF.needsEHCleanup(dtorKind), &D);
114 argument = llvm::Constant::getNullValue(CGF.Int8PtrTy);
117 CGM.getCXXABI().registerGlobalDtor(CGF, D, function, argument);
120 /// Emit code to cause the variable at the given address to be considered as
121 /// constant from this point onwards.
122 static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
123 llvm::Constant *Addr) {
124 // Do not emit the intrinsic if we're not optimizing.
125 if (!CGF.CGM.getCodeGenOpts().OptimizationLevel)
128 // Grab the llvm.invariant.start intrinsic.
129 llvm::Intrinsic::ID InvStartID = llvm::Intrinsic::invariant_start;
130 // Overloaded address space type.
131 llvm::Type *ObjectPtr[1] = {CGF.Int8PtrTy};
132 llvm::Constant *InvariantStart = CGF.CGM.getIntrinsic(InvStartID, ObjectPtr);
134 // Emit a call with the size in bytes of the object.
135 CharUnits WidthChars = CGF.getContext().getTypeSizeInChars(D.getType());
136 uint64_t Width = WidthChars.getQuantity();
137 llvm::Value *Args[2] = { llvm::ConstantInt::getSigned(CGF.Int64Ty, Width),
138 llvm::ConstantExpr::getBitCast(Addr, CGF.Int8PtrTy)};
139 CGF.Builder.CreateCall(InvariantStart, Args);
142 void CodeGenFunction::EmitCXXGlobalVarDeclInit(const VarDecl &D,
143 llvm::Constant *DeclPtr,
146 const Expr *Init = D.getInit();
147 QualType T = D.getType();
149 // The address space of a static local variable (DeclPtr) may be different
150 // from the address space of the "this" argument of the constructor. In that
151 // case, we need an addrspacecast before calling the constructor.
153 // struct StructWithCtor {
154 // __device__ StructWithCtor() {...}
156 // __device__ void foo() {
157 // __shared__ StructWithCtor s;
161 // For example, in the above CUDA code, the static local variable s has a
162 // "shared" address space qualifier, but the constructor of StructWithCtor
163 // expects "this" in the "generic" address space.
164 unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(T);
165 unsigned ActualAddrSpace = DeclPtr->getType()->getPointerAddressSpace();
166 if (ActualAddrSpace != ExpectedAddrSpace) {
167 llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(T);
168 llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
169 DeclPtr = llvm::ConstantExpr::getAddrSpaceCast(DeclPtr, PTy);
172 ConstantAddress DeclAddr(DeclPtr, getContext().getDeclAlign(&D));
174 if (!T->isReferenceType()) {
175 if (getLangOpts().OpenMP && D.hasAttr<OMPThreadPrivateDeclAttr>())
176 (void)CGM.getOpenMPRuntime().emitThreadPrivateVarDefinition(
177 &D, DeclAddr, D.getAttr<OMPThreadPrivateDeclAttr>()->getLocation(),
180 EmitDeclInit(*this, D, DeclAddr);
181 if (CGM.isTypeConstant(D.getType(), true))
182 EmitDeclInvariant(*this, D, DeclPtr);
184 EmitDeclDestroy(*this, D, DeclAddr);
188 assert(PerformInit && "cannot have constant initializer which needs "
189 "destruction for reference");
190 RValue RV = EmitReferenceBindingToExpr(Init);
191 EmitStoreOfScalar(RV.getScalarVal(), DeclAddr, false, T);
194 /// Create a stub function, suitable for being passed to atexit,
195 /// which passes the given address to the given destructor function.
196 llvm::Constant *CodeGenFunction::createAtExitStub(const VarDecl &VD,
197 llvm::Constant *dtor,
198 llvm::Constant *addr) {
199 // Get the destructor function type, void(*)(void).
200 llvm::FunctionType *ty = llvm::FunctionType::get(CGM.VoidTy, false);
201 SmallString<256> FnName;
203 llvm::raw_svector_ostream Out(FnName);
204 CGM.getCXXABI().getMangleContext().mangleDynamicAtExitDestructor(&VD, Out);
207 const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
208 llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(ty, FnName.str(),
212 CodeGenFunction CGF(CGM);
214 CGF.StartFunction(&VD, CGM.getContext().VoidTy, fn, FI, FunctionArgList());
216 llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
218 // Make sure the call and the callee agree on calling convention.
219 if (llvm::Function *dtorFn =
220 dyn_cast<llvm::Function>(dtor->stripPointerCasts()))
221 call->setCallingConv(dtorFn->getCallingConv());
223 CGF.FinishFunction();
228 /// Register a global destructor using the C atexit runtime function.
229 void CodeGenFunction::registerGlobalDtorWithAtExit(const VarDecl &VD,
230 llvm::Constant *dtor,
231 llvm::Constant *addr) {
232 // Create a function which calls the destructor.
233 llvm::Constant *dtorStub = createAtExitStub(VD, dtor, addr);
235 // extern "C" int atexit(void (*f)(void));
236 llvm::FunctionType *atexitTy =
237 llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
239 llvm::Constant *atexit =
240 CGM.CreateRuntimeFunction(atexitTy, "atexit", llvm::AttributeList(),
242 if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit))
243 atexitFn->setDoesNotThrow();
245 EmitNounwindRuntimeCall(atexit, dtorStub);
248 void CodeGenFunction::EmitCXXGuardedInit(const VarDecl &D,
249 llvm::GlobalVariable *DeclPtr,
251 // If we've been asked to forbid guard variables, emit an error now.
252 // This diagnostic is hard-coded for Darwin's use case; we can find
253 // better phrasing if someone else needs it.
254 if (CGM.getCodeGenOpts().ForbidGuardVariables)
255 CGM.Error(D.getLocation(),
256 "this initialization requires a guard variable, which "
257 "the kernel does not support");
259 CGM.getCXXABI().EmitGuardedInit(*this, D, DeclPtr, PerformInit);
262 llvm::Function *CodeGenModule::CreateGlobalInitOrDestructFunction(
263 llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
264 SourceLocation Loc, bool TLS) {
266 llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
268 if (!getLangOpts().AppleKext && !TLS) {
269 // Set the section if needed.
270 if (const char *Section = getTarget().getStaticInitSectionSpecifier())
271 Fn->setSection(Section);
274 SetInternalFunctionAttributes(nullptr, Fn, FI);
276 Fn->setCallingConv(getRuntimeCC());
278 if (!getLangOpts().Exceptions)
279 Fn->setDoesNotThrow();
281 if (!isInSanitizerBlacklist(Fn, Loc)) {
282 if (getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
283 SanitizerKind::KernelAddress))
284 Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
285 if (getLangOpts().Sanitize.has(SanitizerKind::Thread))
286 Fn->addFnAttr(llvm::Attribute::SanitizeThread);
287 if (getLangOpts().Sanitize.has(SanitizerKind::Memory))
288 Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
289 if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack))
290 Fn->addFnAttr(llvm::Attribute::SafeStack);
296 /// Create a global pointer to a function that will initialize a global
297 /// variable. The user has requested that this pointer be emitted in a specific
299 void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
300 llvm::GlobalVariable *GV,
301 llvm::Function *InitFunc,
303 llvm::GlobalVariable *PtrArray = new llvm::GlobalVariable(
304 TheModule, InitFunc->getType(), /*isConstant=*/true,
305 llvm::GlobalValue::PrivateLinkage, InitFunc, "__cxx_init_fn_ptr");
306 PtrArray->setSection(ISA->getSection());
307 addUsedGlobal(PtrArray);
309 // If the GV is already in a comdat group, then we have to join it.
310 if (llvm::Comdat *C = GV->getComdat())
311 PtrArray->setComdat(C);
315 CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
316 llvm::GlobalVariable *Addr,
319 // According to E.2.3.1 in CUDA-7.5 Programming guide: __device__,
320 // __constant__ and __shared__ variables defined in namespace scope,
321 // that are of class type, cannot have a non-empty constructor. All
322 // the checks have been done in Sema by now. Whatever initializers
323 // are allowed are empty and we just need to ignore them here.
324 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
325 (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
326 D->hasAttr<CUDASharedAttr>()))
329 // Check if we've already initialized this decl.
330 auto I = DelayedCXXInitPosition.find(D);
331 if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
334 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
335 SmallString<256> FnName;
337 llvm::raw_svector_ostream Out(FnName);
338 getCXXABI().getMangleContext().mangleDynamicInitializer(D, Out);
341 // Create a variable initialization function.
343 CreateGlobalInitOrDestructFunction(FTy, FnName.str(),
344 getTypes().arrangeNullaryFunction(),
347 auto *ISA = D->getAttr<InitSegAttr>();
348 CodeGenFunction(*this).GenerateCXXGlobalVarDeclInitFunc(Fn, D, Addr,
351 llvm::GlobalVariable *COMDATKey =
352 supportsCOMDAT() && D->isExternallyVisible() ? Addr : nullptr;
354 if (D->getTLSKind()) {
355 // FIXME: Should we support init_priority for thread_local?
356 // FIXME: We only need to register one __cxa_thread_atexit function for the
358 CXXThreadLocalInits.push_back(Fn);
359 CXXThreadLocalInitVars.push_back(D);
360 } else if (PerformInit && ISA) {
361 EmitPointerToInitFunc(D, Addr, Fn, ISA);
362 } else if (auto *IPA = D->getAttr<InitPriorityAttr>()) {
363 OrderGlobalInits Key(IPA->getPriority(), PrioritizedCXXGlobalInits.size());
364 PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
365 } else if (isTemplateInstantiation(D->getTemplateSpecializationKind())) {
366 // C++ [basic.start.init]p2:
367 // Definitions of explicitly specialized class template static data
368 // members have ordered initialization. Other class template static data
369 // members (i.e., implicitly or explicitly instantiated specializations)
370 // have unordered initialization.
372 // As a consequence, we can put them into their own llvm.global_ctors entry.
374 // If the global is externally visible, put the initializer into a COMDAT
375 // group with the global being initialized. On most platforms, this is a
376 // minor startup time optimization. In the MS C++ ABI, there are no guard
377 // variables, so this COMDAT key is required for correctness.
378 AddGlobalCtor(Fn, 65535, COMDATKey);
379 } else if (D->hasAttr<SelectAnyAttr>()) {
380 // SelectAny globals will be comdat-folded. Put the initializer into a
381 // COMDAT group associated with the global, so the initializers get folded
383 AddGlobalCtor(Fn, 65535, COMDATKey);
385 I = DelayedCXXInitPosition.find(D); // Re-do lookup in case of re-hash.
386 if (I == DelayedCXXInitPosition.end()) {
387 CXXGlobalInits.push_back(Fn);
388 } else if (I->second != ~0U) {
389 assert(I->second < CXXGlobalInits.size() &&
390 CXXGlobalInits[I->second] == nullptr);
391 CXXGlobalInits[I->second] = Fn;
395 // Remember that we already emitted the initializer for this global.
396 DelayedCXXInitPosition[D] = ~0U;
399 void CodeGenModule::EmitCXXThreadLocalInitFunc() {
400 getCXXABI().EmitThreadLocalInitFuncs(
401 *this, CXXThreadLocals, CXXThreadLocalInits, CXXThreadLocalInitVars);
403 CXXThreadLocalInits.clear();
404 CXXThreadLocalInitVars.clear();
405 CXXThreadLocals.clear();
409 CodeGenModule::EmitCXXGlobalInitFunc() {
410 while (!CXXGlobalInits.empty() && !CXXGlobalInits.back())
411 CXXGlobalInits.pop_back();
413 if (CXXGlobalInits.empty() && PrioritizedCXXGlobalInits.empty())
416 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
417 const CGFunctionInfo &FI = getTypes().arrangeNullaryFunction();
419 // Create our global initialization function.
420 if (!PrioritizedCXXGlobalInits.empty()) {
421 SmallVector<llvm::Function *, 8> LocalCXXGlobalInits;
422 llvm::array_pod_sort(PrioritizedCXXGlobalInits.begin(),
423 PrioritizedCXXGlobalInits.end());
424 // Iterate over "chunks" of ctors with same priority and emit each chunk
425 // into separate function. Note - everything is sorted first by priority,
426 // second - by lex order, so we emit ctor functions in proper order.
427 for (SmallVectorImpl<GlobalInitData >::iterator
428 I = PrioritizedCXXGlobalInits.begin(),
429 E = PrioritizedCXXGlobalInits.end(); I != E; ) {
430 SmallVectorImpl<GlobalInitData >::iterator
431 PrioE = std::upper_bound(I + 1, E, *I, GlobalInitPriorityCmp());
433 LocalCXXGlobalInits.clear();
434 unsigned Priority = I->first.priority;
435 // Compute the function suffix from priority. Prepend with zeroes to make
436 // sure the function names are also ordered as priorities.
437 std::string PrioritySuffix = llvm::utostr(Priority);
438 // Priority is always <= 65535 (enforced by sema).
439 PrioritySuffix = std::string(6-PrioritySuffix.size(), '0')+PrioritySuffix;
440 llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
441 FTy, "_GLOBAL__I_" + PrioritySuffix, FI);
443 for (; I < PrioE; ++I)
444 LocalCXXGlobalInits.push_back(I->second);
446 CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, LocalCXXGlobalInits);
447 AddGlobalCtor(Fn, Priority);
449 PrioritizedCXXGlobalInits.clear();
452 SmallString<128> FileName;
453 SourceManager &SM = Context.getSourceManager();
454 if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
455 // Include the filename in the symbol name. Including "sub_" matches gcc and
456 // makes sure these symbols appear lexicographically behind the symbols with
457 // priority emitted above.
458 FileName = llvm::sys::path::filename(MainFile->getName());
463 for (size_t i = 0; i < FileName.size(); ++i) {
464 // Replace everything that's not [a-zA-Z0-9._] with a _. This set happens
465 // to be the set of C preprocessing numbers.
466 if (!isPreprocessingNumberBody(FileName[i]))
470 llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
471 FTy, llvm::Twine("_GLOBAL__sub_I_", FileName), FI);
473 CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
476 CXXGlobalInits.clear();
479 void CodeGenModule::EmitCXXGlobalDtorFunc() {
480 if (CXXGlobalDtors.empty())
483 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
485 // Create our global destructor function.
486 const CGFunctionInfo &FI = getTypes().arrangeNullaryFunction();
488 CreateGlobalInitOrDestructFunction(FTy, "_GLOBAL__D_a", FI);
490 CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
494 /// Emit the code necessary to initialize the given global variable.
495 void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
497 llvm::GlobalVariable *Addr,
499 // Check if we need to emit debug info for variable initializer.
500 if (D->hasAttr<NoDebugAttr>())
501 DebugInfo = nullptr; // disable debug info indefinitely for this function
503 CurEHLocation = D->getLocStart();
505 StartFunction(GlobalDecl(D), getContext().VoidTy, Fn,
506 getTypes().arrangeNullaryFunction(),
507 FunctionArgList(), D->getLocation(),
508 D->getInit()->getExprLoc());
510 // Use guarded initialization if the global variable is weak. This
511 // occurs for, e.g., instantiated static data members and
512 // definitions explicitly marked weak.
513 if (Addr->hasWeakLinkage() || Addr->hasLinkOnceLinkage()) {
514 EmitCXXGuardedInit(*D, Addr, PerformInit);
516 EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
523 CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
524 ArrayRef<llvm::Function *> Decls,
527 auto NL = ApplyDebugLocation::CreateEmpty(*this);
528 StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
529 getTypes().arrangeNullaryFunction(), FunctionArgList());
530 // Emit an artificial location for this function.
531 auto AL = ApplyDebugLocation::CreateArtificial(*this);
533 llvm::BasicBlock *ExitBlock = nullptr;
534 if (Guard.isValid()) {
535 // If we have a guard variable, check whether we've already performed
536 // these initializations. This happens for TLS initialization functions.
537 llvm::Value *GuardVal = Builder.CreateLoad(Guard);
538 llvm::Value *Uninit = Builder.CreateIsNull(GuardVal,
539 "guard.uninitialized");
540 llvm::BasicBlock *InitBlock = createBasicBlock("init");
541 ExitBlock = createBasicBlock("exit");
542 Builder.CreateCondBr(Uninit, InitBlock, ExitBlock);
543 EmitBlock(InitBlock);
544 // Mark as initialized before initializing anything else. If the
545 // initializers use previously-initialized thread_local vars, that's
546 // probably supposed to be OK, but the standard doesn't say.
547 Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(),1), Guard);
550 RunCleanupsScope Scope(*this);
552 // When building in Objective-C++ ARC mode, create an autorelease pool
553 // around the global initializers.
554 if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
555 llvm::Value *token = EmitObjCAutoreleasePoolPush();
556 EmitObjCAutoreleasePoolCleanup(token);
559 for (unsigned i = 0, e = Decls.size(); i != e; ++i)
561 EmitRuntimeCall(Decls[i]);
563 Scope.ForceCleanup();
566 Builder.CreateBr(ExitBlock);
567 EmitBlock(ExitBlock);
574 void CodeGenFunction::GenerateCXXGlobalDtorsFunc(
576 const std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>>
579 auto NL = ApplyDebugLocation::CreateEmpty(*this);
580 StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
581 getTypes().arrangeNullaryFunction(), FunctionArgList());
582 // Emit an artificial location for this function.
583 auto AL = ApplyDebugLocation::CreateArtificial(*this);
585 // Emit the dtors, in reverse order from construction.
586 for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
587 llvm::Value *Callee = DtorsAndObjects[e - i - 1].first;
588 llvm::CallInst *CI = Builder.CreateCall(Callee,
589 DtorsAndObjects[e - i - 1].second);
590 // Make sure the call and the callee agree on calling convention.
591 if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
592 CI->setCallingConv(F->getCallingConv());
599 /// generateDestroyHelper - Generates a helper function which, when
600 /// invoked, destroys the given object. The address of the object
601 /// should be in global memory.
602 llvm::Function *CodeGenFunction::generateDestroyHelper(
603 Address addr, QualType type, Destroyer *destroyer,
604 bool useEHCleanupForArray, const VarDecl *VD) {
605 FunctionArgList args;
606 ImplicitParamDecl Dst(getContext(), getContext().VoidPtrTy,
607 ImplicitParamDecl::Other);
608 args.push_back(&Dst);
610 const CGFunctionInfo &FI =
611 CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, args);
612 llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
613 llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
614 FTy, "__cxx_global_array_dtor", FI, VD->getLocation());
616 CurEHLocation = VD->getLocStart();
618 StartFunction(VD, getContext().VoidTy, fn, FI, args);
620 emitDestroy(addr, type, destroyer, useEHCleanupForArray);