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, where there's a function
90 // with the right signature that we can just call.
91 const CXXRecordDecl *record = nullptr;
92 if (dtorKind == QualType::DK_cxx_destructor &&
93 (record = type->getAsCXXRecordDecl())) {
94 assert(!record->hasTrivialDestructor());
95 CXXDestructorDecl *dtor = record->getDestructor();
97 function = CGM.getAddrOfCXXStructor(dtor, StructorType::Complete);
98 argument = llvm::ConstantExpr::getBitCast(
99 addr.getPointer(), CGF.getTypes().ConvertType(type)->getPointerTo());
101 // Otherwise, the standard logic requires a helper function.
103 function = CodeGenFunction(CGM)
104 .generateDestroyHelper(addr, type, CGF.getDestroyer(dtorKind),
105 CGF.needsEHCleanup(dtorKind), &D);
106 argument = llvm::Constant::getNullValue(CGF.Int8PtrTy);
109 CGM.getCXXABI().registerGlobalDtor(CGF, D, function, argument);
112 /// Emit code to cause the variable at the given address to be considered as
113 /// constant from this point onwards.
114 static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
115 llvm::Constant *Addr) {
116 // Don't emit the intrinsic if we're not optimizing.
117 if (!CGF.CGM.getCodeGenOpts().OptimizationLevel)
120 // Grab the llvm.invariant.start intrinsic.
121 llvm::Intrinsic::ID InvStartID = llvm::Intrinsic::invariant_start;
122 llvm::Constant *InvariantStart = CGF.CGM.getIntrinsic(InvStartID);
124 // Emit a call with the size in bytes of the object.
125 CharUnits WidthChars = CGF.getContext().getTypeSizeInChars(D.getType());
126 uint64_t Width = WidthChars.getQuantity();
127 llvm::Value *Args[2] = { llvm::ConstantInt::getSigned(CGF.Int64Ty, Width),
128 llvm::ConstantExpr::getBitCast(Addr, CGF.Int8PtrTy)};
129 CGF.Builder.CreateCall(InvariantStart, Args);
132 void CodeGenFunction::EmitCXXGlobalVarDeclInit(const VarDecl &D,
133 llvm::Constant *DeclPtr,
136 const Expr *Init = D.getInit();
137 QualType T = D.getType();
139 // The address space of a static local variable (DeclPtr) may be different
140 // from the address space of the "this" argument of the constructor. In that
141 // case, we need an addrspacecast before calling the constructor.
143 // struct StructWithCtor {
144 // __device__ StructWithCtor() {...}
146 // __device__ void foo() {
147 // __shared__ StructWithCtor s;
151 // For example, in the above CUDA code, the static local variable s has a
152 // "shared" address space qualifier, but the constructor of StructWithCtor
153 // expects "this" in the "generic" address space.
154 unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(T);
155 unsigned ActualAddrSpace = DeclPtr->getType()->getPointerAddressSpace();
156 if (ActualAddrSpace != ExpectedAddrSpace) {
157 llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(T);
158 llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
159 DeclPtr = llvm::ConstantExpr::getAddrSpaceCast(DeclPtr, PTy);
162 ConstantAddress DeclAddr(DeclPtr, getContext().getDeclAlign(&D));
164 if (!T->isReferenceType()) {
165 if (getLangOpts().OpenMP && D.hasAttr<OMPThreadPrivateDeclAttr>())
166 (void)CGM.getOpenMPRuntime().emitThreadPrivateVarDefinition(
167 &D, DeclAddr, D.getAttr<OMPThreadPrivateDeclAttr>()->getLocation(),
170 EmitDeclInit(*this, D, DeclAddr);
171 if (CGM.isTypeConstant(D.getType(), true))
172 EmitDeclInvariant(*this, D, DeclPtr);
174 EmitDeclDestroy(*this, D, DeclAddr);
178 assert(PerformInit && "cannot have constant initializer which needs "
179 "destruction for reference");
180 RValue RV = EmitReferenceBindingToExpr(Init);
181 EmitStoreOfScalar(RV.getScalarVal(), DeclAddr, false, T);
184 /// Create a stub function, suitable for being passed to atexit,
185 /// which passes the given address to the given destructor function.
186 llvm::Constant *CodeGenFunction::createAtExitStub(const VarDecl &VD,
187 llvm::Constant *dtor,
188 llvm::Constant *addr) {
189 // Get the destructor function type, void(*)(void).
190 llvm::FunctionType *ty = llvm::FunctionType::get(CGM.VoidTy, false);
191 SmallString<256> FnName;
193 llvm::raw_svector_ostream Out(FnName);
194 CGM.getCXXABI().getMangleContext().mangleDynamicAtExitDestructor(&VD, Out);
197 const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
198 llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(ty, FnName.str(),
202 CodeGenFunction CGF(CGM);
204 CGF.StartFunction(&VD, CGM.getContext().VoidTy, fn, FI, FunctionArgList());
206 llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
208 // Make sure the call and the callee agree on calling convention.
209 if (llvm::Function *dtorFn =
210 dyn_cast<llvm::Function>(dtor->stripPointerCasts()))
211 call->setCallingConv(dtorFn->getCallingConv());
213 CGF.FinishFunction();
218 /// Register a global destructor using the C atexit runtime function.
219 void CodeGenFunction::registerGlobalDtorWithAtExit(const VarDecl &VD,
220 llvm::Constant *dtor,
221 llvm::Constant *addr) {
222 // Create a function which calls the destructor.
223 llvm::Constant *dtorStub = createAtExitStub(VD, dtor, addr);
225 // extern "C" int atexit(void (*f)(void));
226 llvm::FunctionType *atexitTy =
227 llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
229 llvm::Constant *atexit =
230 CGM.CreateRuntimeFunction(atexitTy, "atexit");
231 if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit))
232 atexitFn->setDoesNotThrow();
234 EmitNounwindRuntimeCall(atexit, dtorStub);
237 void CodeGenFunction::EmitCXXGuardedInit(const VarDecl &D,
238 llvm::GlobalVariable *DeclPtr,
240 // If we've been asked to forbid guard variables, emit an error now.
241 // This diagnostic is hard-coded for Darwin's use case; we can find
242 // better phrasing if someone else needs it.
243 if (CGM.getCodeGenOpts().ForbidGuardVariables)
244 CGM.Error(D.getLocation(),
245 "this initialization requires a guard variable, which "
246 "the kernel does not support");
248 CGM.getCXXABI().EmitGuardedInit(*this, D, DeclPtr, PerformInit);
251 llvm::Function *CodeGenModule::CreateGlobalInitOrDestructFunction(
252 llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
253 SourceLocation Loc, bool TLS) {
255 llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
257 if (!getLangOpts().AppleKext && !TLS) {
258 // Set the section if needed.
259 if (const char *Section = getTarget().getStaticInitSectionSpecifier())
260 Fn->setSection(Section);
263 SetInternalFunctionAttributes(nullptr, Fn, FI);
265 Fn->setCallingConv(getRuntimeCC());
267 if (!getLangOpts().Exceptions)
268 Fn->setDoesNotThrow();
270 if (!isInSanitizerBlacklist(Fn, Loc)) {
271 if (getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
272 SanitizerKind::KernelAddress))
273 Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
274 if (getLangOpts().Sanitize.has(SanitizerKind::Thread))
275 Fn->addFnAttr(llvm::Attribute::SanitizeThread);
276 if (getLangOpts().Sanitize.has(SanitizerKind::Memory))
277 Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
278 if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack))
279 Fn->addFnAttr(llvm::Attribute::SafeStack);
285 /// Create a global pointer to a function that will initialize a global
286 /// variable. The user has requested that this pointer be emitted in a specific
288 void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
289 llvm::GlobalVariable *GV,
290 llvm::Function *InitFunc,
292 llvm::GlobalVariable *PtrArray = new llvm::GlobalVariable(
293 TheModule, InitFunc->getType(), /*isConstant=*/true,
294 llvm::GlobalValue::PrivateLinkage, InitFunc, "__cxx_init_fn_ptr");
295 PtrArray->setSection(ISA->getSection());
296 addUsedGlobal(PtrArray);
298 // If the GV is already in a comdat group, then we have to join it.
299 if (llvm::Comdat *C = GV->getComdat())
300 PtrArray->setComdat(C);
304 CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
305 llvm::GlobalVariable *Addr,
307 // Check if we've already initialized this decl.
308 auto I = DelayedCXXInitPosition.find(D);
309 if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
312 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
313 SmallString<256> FnName;
315 llvm::raw_svector_ostream Out(FnName);
316 getCXXABI().getMangleContext().mangleDynamicInitializer(D, Out);
319 // Create a variable initialization function.
321 CreateGlobalInitOrDestructFunction(FTy, FnName.str(),
322 getTypes().arrangeNullaryFunction(),
325 auto *ISA = D->getAttr<InitSegAttr>();
326 CodeGenFunction(*this).GenerateCXXGlobalVarDeclInitFunc(Fn, D, Addr,
329 llvm::GlobalVariable *COMDATKey =
330 supportsCOMDAT() && D->isExternallyVisible() ? Addr : nullptr;
332 if (D->getTLSKind()) {
333 // FIXME: Should we support init_priority for thread_local?
334 // FIXME: Ideally, initialization of instantiated thread_local static data
335 // members of class templates should not trigger initialization of other
336 // entities in the TU.
337 // FIXME: We only need to register one __cxa_thread_atexit function for the
339 CXXThreadLocalInits.push_back(Fn);
340 CXXThreadLocalInitVars.push_back(D);
341 } else if (PerformInit && ISA) {
342 EmitPointerToInitFunc(D, Addr, Fn, ISA);
343 } else if (auto *IPA = D->getAttr<InitPriorityAttr>()) {
344 OrderGlobalInits Key(IPA->getPriority(), PrioritizedCXXGlobalInits.size());
345 PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
346 } else if (isTemplateInstantiation(D->getTemplateSpecializationKind())) {
347 // C++ [basic.start.init]p2:
348 // Definitions of explicitly specialized class template static data
349 // members have ordered initialization. Other class template static data
350 // members (i.e., implicitly or explicitly instantiated specializations)
351 // have unordered initialization.
353 // As a consequence, we can put them into their own llvm.global_ctors entry.
355 // If the global is externally visible, put the initializer into a COMDAT
356 // group with the global being initialized. On most platforms, this is a
357 // minor startup time optimization. In the MS C++ ABI, there are no guard
358 // variables, so this COMDAT key is required for correctness.
359 AddGlobalCtor(Fn, 65535, COMDATKey);
360 } else if (D->hasAttr<SelectAnyAttr>()) {
361 // SelectAny globals will be comdat-folded. Put the initializer into a
362 // COMDAT group associated with the global, so the initializers get folded
364 AddGlobalCtor(Fn, 65535, COMDATKey);
366 I = DelayedCXXInitPosition.find(D); // Re-do lookup in case of re-hash.
367 if (I == DelayedCXXInitPosition.end()) {
368 CXXGlobalInits.push_back(Fn);
369 } else if (I->second != ~0U) {
370 assert(I->second < CXXGlobalInits.size() &&
371 CXXGlobalInits[I->second] == nullptr);
372 CXXGlobalInits[I->second] = Fn;
376 // Remember that we already emitted the initializer for this global.
377 DelayedCXXInitPosition[D] = ~0U;
380 void CodeGenModule::EmitCXXThreadLocalInitFunc() {
381 getCXXABI().EmitThreadLocalInitFuncs(
382 *this, CXXThreadLocals, CXXThreadLocalInits, CXXThreadLocalInitVars);
384 CXXThreadLocalInits.clear();
385 CXXThreadLocalInitVars.clear();
386 CXXThreadLocals.clear();
390 CodeGenModule::EmitCXXGlobalInitFunc() {
391 while (!CXXGlobalInits.empty() && !CXXGlobalInits.back())
392 CXXGlobalInits.pop_back();
394 if (CXXGlobalInits.empty() && PrioritizedCXXGlobalInits.empty())
397 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
398 const CGFunctionInfo &FI = getTypes().arrangeNullaryFunction();
400 // Create our global initialization function.
401 if (!PrioritizedCXXGlobalInits.empty()) {
402 SmallVector<llvm::Function *, 8> LocalCXXGlobalInits;
403 llvm::array_pod_sort(PrioritizedCXXGlobalInits.begin(),
404 PrioritizedCXXGlobalInits.end());
405 // Iterate over "chunks" of ctors with same priority and emit each chunk
406 // into separate function. Note - everything is sorted first by priority,
407 // second - by lex order, so we emit ctor functions in proper order.
408 for (SmallVectorImpl<GlobalInitData >::iterator
409 I = PrioritizedCXXGlobalInits.begin(),
410 E = PrioritizedCXXGlobalInits.end(); I != E; ) {
411 SmallVectorImpl<GlobalInitData >::iterator
412 PrioE = std::upper_bound(I + 1, E, *I, GlobalInitPriorityCmp());
414 LocalCXXGlobalInits.clear();
415 unsigned Priority = I->first.priority;
416 // Compute the function suffix from priority. Prepend with zeroes to make
417 // sure the function names are also ordered as priorities.
418 std::string PrioritySuffix = llvm::utostr(Priority);
419 // Priority is always <= 65535 (enforced by sema).
420 PrioritySuffix = std::string(6-PrioritySuffix.size(), '0')+PrioritySuffix;
421 llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
422 FTy, "_GLOBAL__I_" + PrioritySuffix, FI);
424 for (; I < PrioE; ++I)
425 LocalCXXGlobalInits.push_back(I->second);
427 CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, LocalCXXGlobalInits);
428 AddGlobalCtor(Fn, Priority);
430 PrioritizedCXXGlobalInits.clear();
433 SmallString<128> FileName;
434 SourceManager &SM = Context.getSourceManager();
435 if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
436 // Include the filename in the symbol name. Including "sub_" matches gcc and
437 // makes sure these symbols appear lexicographically behind the symbols with
438 // priority emitted above.
439 FileName = llvm::sys::path::filename(MainFile->getName());
444 for (size_t i = 0; i < FileName.size(); ++i) {
445 // Replace everything that's not [a-zA-Z0-9._] with a _. This set happens
446 // to be the set of C preprocessing numbers.
447 if (!isPreprocessingNumberBody(FileName[i]))
451 llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
452 FTy, llvm::Twine("_GLOBAL__sub_I_", FileName), FI);
454 CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
457 CXXGlobalInits.clear();
460 void CodeGenModule::EmitCXXGlobalDtorFunc() {
461 if (CXXGlobalDtors.empty())
464 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
466 // Create our global destructor function.
467 const CGFunctionInfo &FI = getTypes().arrangeNullaryFunction();
469 CreateGlobalInitOrDestructFunction(FTy, "_GLOBAL__D_a", FI);
471 CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
475 /// Emit the code necessary to initialize the given global variable.
476 void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
478 llvm::GlobalVariable *Addr,
480 // Check if we need to emit debug info for variable initializer.
481 if (D->hasAttr<NoDebugAttr>())
482 DebugInfo = nullptr; // disable debug info indefinitely for this function
484 CurEHLocation = D->getLocStart();
486 StartFunction(GlobalDecl(D), getContext().VoidTy, Fn,
487 getTypes().arrangeNullaryFunction(),
488 FunctionArgList(), D->getLocation(),
489 D->getInit()->getExprLoc());
491 // Use guarded initialization if the global variable is weak. This
492 // occurs for, e.g., instantiated static data members and
493 // definitions explicitly marked weak.
494 if (Addr->hasWeakLinkage() || Addr->hasLinkOnceLinkage()) {
495 EmitCXXGuardedInit(*D, Addr, PerformInit);
497 EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
504 CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
505 ArrayRef<llvm::Function *> Decls,
508 auto NL = ApplyDebugLocation::CreateEmpty(*this);
509 StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
510 getTypes().arrangeNullaryFunction(), FunctionArgList());
511 // Emit an artificial location for this function.
512 auto AL = ApplyDebugLocation::CreateArtificial(*this);
514 llvm::BasicBlock *ExitBlock = nullptr;
515 if (Guard.isValid()) {
516 // If we have a guard variable, check whether we've already performed
517 // these initializations. This happens for TLS initialization functions.
518 llvm::Value *GuardVal = Builder.CreateLoad(Guard);
519 llvm::Value *Uninit = Builder.CreateIsNull(GuardVal,
520 "guard.uninitialized");
521 llvm::BasicBlock *InitBlock = createBasicBlock("init");
522 ExitBlock = createBasicBlock("exit");
523 Builder.CreateCondBr(Uninit, InitBlock, ExitBlock);
524 EmitBlock(InitBlock);
525 // Mark as initialized before initializing anything else. If the
526 // initializers use previously-initialized thread_local vars, that's
527 // probably supposed to be OK, but the standard doesn't say.
528 Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(),1), Guard);
531 RunCleanupsScope Scope(*this);
533 // When building in Objective-C++ ARC mode, create an autorelease pool
534 // around the global initializers.
535 if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
536 llvm::Value *token = EmitObjCAutoreleasePoolPush();
537 EmitObjCAutoreleasePoolCleanup(token);
540 for (unsigned i = 0, e = Decls.size(); i != e; ++i)
542 EmitRuntimeCall(Decls[i]);
544 Scope.ForceCleanup();
547 Builder.CreateBr(ExitBlock);
548 EmitBlock(ExitBlock);
555 void CodeGenFunction::GenerateCXXGlobalDtorsFunc(llvm::Function *Fn,
556 const std::vector<std::pair<llvm::WeakVH, llvm::Constant*> >
559 auto NL = ApplyDebugLocation::CreateEmpty(*this);
560 StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
561 getTypes().arrangeNullaryFunction(), FunctionArgList());
562 // Emit an artificial location for this function.
563 auto AL = ApplyDebugLocation::CreateArtificial(*this);
565 // Emit the dtors, in reverse order from construction.
566 for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
567 llvm::Value *Callee = DtorsAndObjects[e - i - 1].first;
568 llvm::CallInst *CI = Builder.CreateCall(Callee,
569 DtorsAndObjects[e - i - 1].second);
570 // Make sure the call and the callee agree on calling convention.
571 if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
572 CI->setCallingConv(F->getCallingConv());
579 /// generateDestroyHelper - Generates a helper function which, when
580 /// invoked, destroys the given object. The address of the object
581 /// should be in global memory.
582 llvm::Function *CodeGenFunction::generateDestroyHelper(
583 Address addr, QualType type, Destroyer *destroyer,
584 bool useEHCleanupForArray, const VarDecl *VD) {
585 FunctionArgList args;
586 ImplicitParamDecl dst(getContext(), nullptr, SourceLocation(), nullptr,
587 getContext().VoidPtrTy);
588 args.push_back(&dst);
590 const CGFunctionInfo &FI = CGM.getTypes().arrangeFreeFunctionDeclaration(
591 getContext().VoidTy, args, FunctionType::ExtInfo(), /*variadic=*/false);
592 llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
593 llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
594 FTy, "__cxx_global_array_dtor", FI, VD->getLocation());
596 CurEHLocation = VD->getLocStart();
598 StartFunction(VD, getContext().VoidTy, fn, FI, args);
600 emitDestroy(addr, type, destroyer, useEHCleanupForArray);