1 //===--- CodeGenTypes.cpp - Type translation for LLVM CodeGen -------------===//
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 is the code that handles AST -> LLVM type lowering.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenTypes.h"
17 #include "CGRecordLayout.h"
18 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "llvm/DerivedTypes.h"
24 #include "llvm/Module.h"
25 #include "llvm/Target/TargetData.h"
26 using namespace clang;
27 using namespace CodeGen;
29 CodeGenTypes::CodeGenTypes(ASTContext &Ctx, llvm::Module& M,
30 const llvm::TargetData &TD, const ABIInfo &Info,
31 CGCXXABI &CXXABI, const CodeGenOptions &CGO)
32 : Context(Ctx), Target(Ctx.getTargetInfo()), TheModule(M), TheTargetData(TD),
33 TheABIInfo(Info), TheCXXABI(CXXABI), CodeGenOpts(CGO) {
34 SkippedLayout = false;
37 CodeGenTypes::~CodeGenTypes() {
38 for (llvm::DenseMap<const Type *, CGRecordLayout *>::iterator
39 I = CGRecordLayouts.begin(), E = CGRecordLayouts.end();
43 for (llvm::FoldingSet<CGFunctionInfo>::iterator
44 I = FunctionInfos.begin(), E = FunctionInfos.end(); I != E; )
48 void CodeGenTypes::addRecordTypeName(const RecordDecl *RD,
51 llvm::SmallString<256> TypeName;
52 llvm::raw_svector_ostream OS(TypeName);
53 OS << RD->getKindName() << '.';
55 // Name the codegen type after the typedef name
56 // if there is no tag type name available
57 if (RD->getIdentifier()) {
58 // FIXME: We should not have to check for a null decl context here.
59 // Right now we do it because the implicit Obj-C decls don't have one.
60 if (RD->getDeclContext())
61 OS << RD->getQualifiedNameAsString();
64 } else if (const TypedefNameDecl *TDD = RD->getTypedefNameForAnonDecl()) {
65 // FIXME: We should not have to check for a null decl context here.
66 // Right now we do it because the implicit Obj-C decls don't have one.
67 if (TDD->getDeclContext())
68 OS << TDD->getQualifiedNameAsString();
77 Ty->setName(OS.str());
80 /// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from
81 /// ConvertType in that it is used to convert to the memory representation for
82 /// a type. For example, the scalar representation for _Bool is i1, but the
83 /// memory representation is usually i8 or i32, depending on the target.
84 llvm::Type *CodeGenTypes::ConvertTypeForMem(QualType T){
85 llvm::Type *R = ConvertType(T);
87 // If this is a non-bool type, don't map it.
88 if (!R->isIntegerTy(1))
91 // Otherwise, return an integer of the target-specified size.
92 return llvm::IntegerType::get(getLLVMContext(),
93 (unsigned)Context.getTypeSize(T));
97 /// isRecordLayoutComplete - Return true if the specified type is already
98 /// completely laid out.
99 bool CodeGenTypes::isRecordLayoutComplete(const Type *Ty) const {
100 llvm::DenseMap<const Type*, llvm::StructType *>::const_iterator I =
101 RecordDeclTypes.find(Ty);
102 return I != RecordDeclTypes.end() && !I->second->isOpaque();
106 isSafeToConvert(QualType T, CodeGenTypes &CGT,
107 llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked);
110 /// isSafeToConvert - Return true if it is safe to convert the specified record
111 /// decl to IR and lay it out, false if doing so would cause us to get into a
112 /// recursive compilation mess.
114 isSafeToConvert(const RecordDecl *RD, CodeGenTypes &CGT,
115 llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked) {
116 // If we have already checked this type (maybe the same type is used by-value
117 // multiple times in multiple structure fields, don't check again.
118 if (!AlreadyChecked.insert(RD)) return true;
120 const Type *Key = CGT.getContext().getTagDeclType(RD).getTypePtr();
122 // If this type is already laid out, converting it is a noop.
123 if (CGT.isRecordLayoutComplete(Key)) return true;
125 // If this type is currently being laid out, we can't recursively compile it.
126 if (CGT.isRecordBeingLaidOut(Key))
129 // If this type would require laying out bases that are currently being laid
130 // out, don't do it. This includes virtual base classes which get laid out
131 // when a class is translated, even though they aren't embedded by-value into
133 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
134 for (CXXRecordDecl::base_class_const_iterator I = CRD->bases_begin(),
135 E = CRD->bases_end(); I != E; ++I)
136 if (!isSafeToConvert(I->getType()->getAs<RecordType>()->getDecl(),
137 CGT, AlreadyChecked))
141 // If this type would require laying out members that are currently being laid
143 for (RecordDecl::field_iterator I = RD->field_begin(),
144 E = RD->field_end(); I != E; ++I)
145 if (!isSafeToConvert(I->getType(), CGT, AlreadyChecked))
148 // If there are no problems, lets do it.
152 /// isSafeToConvert - Return true if it is safe to convert this field type,
153 /// which requires the structure elements contained by-value to all be
154 /// recursively safe to convert.
156 isSafeToConvert(QualType T, CodeGenTypes &CGT,
157 llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked) {
158 T = T.getCanonicalType();
160 // If this is a record, check it.
161 if (const RecordType *RT = dyn_cast<RecordType>(T))
162 return isSafeToConvert(RT->getDecl(), CGT, AlreadyChecked);
164 // If this is an array, check the elements, which are embedded inline.
165 if (const ArrayType *AT = dyn_cast<ArrayType>(T))
166 return isSafeToConvert(AT->getElementType(), CGT, AlreadyChecked);
168 // Otherwise, there is no concern about transforming this. We only care about
169 // things that are contained by-value in a structure that can have another
170 // structure as a member.
175 /// isSafeToConvert - Return true if it is safe to convert the specified record
176 /// decl to IR and lay it out, false if doing so would cause us to get into a
177 /// recursive compilation mess.
178 static bool isSafeToConvert(const RecordDecl *RD, CodeGenTypes &CGT) {
179 // If no structs are being laid out, we can certainly do this one.
180 if (CGT.noRecordsBeingLaidOut()) return true;
182 llvm::SmallPtrSet<const RecordDecl*, 16> AlreadyChecked;
183 return isSafeToConvert(RD, CGT, AlreadyChecked);
187 /// isFuncTypeArgumentConvertible - Return true if the specified type in a
188 /// function argument or result position can be converted to an IR type at this
189 /// point. This boils down to being whether it is complete, as well as whether
190 /// we've temporarily deferred expanding the type because we're in a recursive
192 bool CodeGenTypes::isFuncTypeArgumentConvertible(QualType Ty) {
193 // If this isn't a tagged type, we can convert it!
194 const TagType *TT = Ty->getAs<TagType>();
195 if (TT == 0) return true;
198 // If it's a tagged type used by-value, but is just a forward decl, we can't
199 // convert it. Note that getDefinition()==0 is not the same as !isDefinition.
200 if (TT->getDecl()->getDefinition() == 0)
203 // If this is an enum, then it is always safe to convert.
204 const RecordType *RT = dyn_cast<RecordType>(TT);
205 if (RT == 0) return true;
207 // Otherwise, we have to be careful. If it is a struct that we're in the
208 // process of expanding, then we can't convert the function type. That's ok
209 // though because we must be in a pointer context under the struct, so we can
210 // just convert it to a dummy type.
212 // We decide this by checking whether ConvertRecordDeclType returns us an
213 // opaque type for a struct that we know is defined.
214 return isSafeToConvert(RT->getDecl(), *this);
218 /// Code to verify a given function type is complete, i.e. the return type
219 /// and all of the argument types are complete. Also check to see if we are in
220 /// a RS_StructPointer context, and if so whether any struct types have been
221 /// pended. If so, we don't want to ask the ABI lowering code to handle a type
222 /// that cannot be converted to an IR type.
223 bool CodeGenTypes::isFuncTypeConvertible(const FunctionType *FT) {
224 if (!isFuncTypeArgumentConvertible(FT->getResultType()))
227 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
228 for (unsigned i = 0, e = FPT->getNumArgs(); i != e; i++)
229 if (!isFuncTypeArgumentConvertible(FPT->getArgType(i)))
235 /// UpdateCompletedType - When we find the full definition for a TagDecl,
236 /// replace the 'opaque' type we previously made for it if applicable.
237 void CodeGenTypes::UpdateCompletedType(const TagDecl *TD) {
238 // If this is an enum being completed, then we flush all non-struct types from
239 // the cache. This allows function types and other things that may be derived
240 // from the enum to be recomputed.
241 if (const EnumDecl *ED = dyn_cast<EnumDecl>(TD)) {
242 // Only flush the cache if we've actually already converted this type.
243 if (TypeCache.count(ED->getTypeForDecl())) {
244 // Okay, we formed some types based on this. We speculated that the enum
245 // would be lowered to i32, so we only need to flush the cache if this
247 if (!ConvertType(ED->getIntegerType())->isIntegerTy(32))
253 // If we completed a RecordDecl that we previously used and converted to an
254 // anonymous type, then go ahead and complete it now.
255 const RecordDecl *RD = cast<RecordDecl>(TD);
256 if (RD->isDependentType()) return;
258 // Only complete it if we converted it already. If we haven't converted it
259 // yet, we'll just do it lazily.
260 if (RecordDeclTypes.count(Context.getTagDeclType(RD).getTypePtr()))
261 ConvertRecordDeclType(RD);
264 static llvm::Type *getTypeForFormat(llvm::LLVMContext &VMContext,
265 const llvm::fltSemantics &format) {
266 if (&format == &llvm::APFloat::IEEEhalf)
267 return llvm::Type::getInt16Ty(VMContext);
268 if (&format == &llvm::APFloat::IEEEsingle)
269 return llvm::Type::getFloatTy(VMContext);
270 if (&format == &llvm::APFloat::IEEEdouble)
271 return llvm::Type::getDoubleTy(VMContext);
272 if (&format == &llvm::APFloat::IEEEquad)
273 return llvm::Type::getFP128Ty(VMContext);
274 if (&format == &llvm::APFloat::PPCDoubleDouble)
275 return llvm::Type::getPPC_FP128Ty(VMContext);
276 if (&format == &llvm::APFloat::x87DoubleExtended)
277 return llvm::Type::getX86_FP80Ty(VMContext);
278 llvm_unreachable("Unknown float format!");
281 /// ConvertType - Convert the specified type to its LLVM form.
282 llvm::Type *CodeGenTypes::ConvertType(QualType T) {
283 T = Context.getCanonicalType(T);
285 const Type *Ty = T.getTypePtr();
287 // RecordTypes are cached and processed specially.
288 if (const RecordType *RT = dyn_cast<RecordType>(Ty))
289 return ConvertRecordDeclType(RT->getDecl());
291 // See if type is already cached.
292 llvm::DenseMap<const Type *, llvm::Type *>::iterator TCI = TypeCache.find(Ty);
293 // If type is found in map then use it. Otherwise, convert type T.
294 if (TCI != TypeCache.end())
297 // If we don't have it in the cache, convert it now.
298 llvm::Type *ResultType = 0;
299 switch (Ty->getTypeClass()) {
300 case Type::Record: // Handled above.
301 #define TYPE(Class, Base)
302 #define ABSTRACT_TYPE(Class, Base)
303 #define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
304 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
305 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class:
306 #include "clang/AST/TypeNodes.def"
307 llvm_unreachable("Non-canonical or dependent types aren't possible.");
310 case Type::Builtin: {
311 switch (cast<BuiltinType>(Ty)->getKind()) {
312 case BuiltinType::Void:
313 case BuiltinType::ObjCId:
314 case BuiltinType::ObjCClass:
315 case BuiltinType::ObjCSel:
316 // LLVM void type can only be used as the result of a function call. Just
317 // map to the same as char.
318 ResultType = llvm::Type::getInt8Ty(getLLVMContext());
321 case BuiltinType::Bool:
322 // Note that we always return bool as i1 for use as a scalar type.
323 ResultType = llvm::Type::getInt1Ty(getLLVMContext());
326 case BuiltinType::Char_S:
327 case BuiltinType::Char_U:
328 case BuiltinType::SChar:
329 case BuiltinType::UChar:
330 case BuiltinType::Short:
331 case BuiltinType::UShort:
332 case BuiltinType::Int:
333 case BuiltinType::UInt:
334 case BuiltinType::Long:
335 case BuiltinType::ULong:
336 case BuiltinType::LongLong:
337 case BuiltinType::ULongLong:
338 case BuiltinType::WChar_S:
339 case BuiltinType::WChar_U:
340 case BuiltinType::Char16:
341 case BuiltinType::Char32:
342 ResultType = llvm::IntegerType::get(getLLVMContext(),
343 static_cast<unsigned>(Context.getTypeSize(T)));
346 case BuiltinType::Half:
347 // Half is special: it might be lowered to i16 (and will be storage-only
348 // type),. or can be represented as a set of native operations.
350 // FIXME: Ask target which kind of half FP it prefers (storage only vs
352 ResultType = llvm::Type::getInt16Ty(getLLVMContext());
354 case BuiltinType::Float:
355 case BuiltinType::Double:
356 case BuiltinType::LongDouble:
357 ResultType = getTypeForFormat(getLLVMContext(),
358 Context.getFloatTypeSemantics(T));
361 case BuiltinType::NullPtr:
362 // Model std::nullptr_t as i8*
363 ResultType = llvm::Type::getInt8PtrTy(getLLVMContext());
366 case BuiltinType::UInt128:
367 case BuiltinType::Int128:
368 ResultType = llvm::IntegerType::get(getLLVMContext(), 128);
371 case BuiltinType::Overload:
372 case BuiltinType::Dependent:
373 case BuiltinType::BoundMember:
374 case BuiltinType::UnknownAny:
375 llvm_unreachable("Unexpected placeholder builtin type!");
380 case Type::Complex: {
381 llvm::Type *EltTy = ConvertType(cast<ComplexType>(Ty)->getElementType());
382 ResultType = llvm::StructType::get(EltTy, EltTy, NULL);
385 case Type::LValueReference:
386 case Type::RValueReference: {
387 const ReferenceType *RTy = cast<ReferenceType>(Ty);
388 QualType ETy = RTy->getPointeeType();
389 llvm::Type *PointeeType = ConvertTypeForMem(ETy);
390 unsigned AS = Context.getTargetAddressSpace(ETy);
391 ResultType = llvm::PointerType::get(PointeeType, AS);
394 case Type::Pointer: {
395 const PointerType *PTy = cast<PointerType>(Ty);
396 QualType ETy = PTy->getPointeeType();
397 llvm::Type *PointeeType = ConvertTypeForMem(ETy);
398 if (PointeeType->isVoidTy())
399 PointeeType = llvm::Type::getInt8Ty(getLLVMContext());
400 unsigned AS = Context.getTargetAddressSpace(ETy);
401 ResultType = llvm::PointerType::get(PointeeType, AS);
405 case Type::VariableArray: {
406 const VariableArrayType *A = cast<VariableArrayType>(Ty);
407 assert(A->getIndexTypeCVRQualifiers() == 0 &&
408 "FIXME: We only handle trivial array types so far!");
409 // VLAs resolve to the innermost element type; this matches
410 // the return of alloca, and there isn't any obviously better choice.
411 ResultType = ConvertTypeForMem(A->getElementType());
414 case Type::IncompleteArray: {
415 const IncompleteArrayType *A = cast<IncompleteArrayType>(Ty);
416 assert(A->getIndexTypeCVRQualifiers() == 0 &&
417 "FIXME: We only handle trivial array types so far!");
418 // int X[] -> [0 x int], unless the element type is not sized. If it is
419 // unsized (e.g. an incomplete struct) just use [0 x i8].
420 ResultType = ConvertTypeForMem(A->getElementType());
421 if (!ResultType->isSized()) {
422 SkippedLayout = true;
423 ResultType = llvm::Type::getInt8Ty(getLLVMContext());
425 ResultType = llvm::ArrayType::get(ResultType, 0);
428 case Type::ConstantArray: {
429 const ConstantArrayType *A = cast<ConstantArrayType>(Ty);
430 llvm::Type *EltTy = ConvertTypeForMem(A->getElementType());
432 // Lower arrays of undefined struct type to arrays of i8 just to have a
434 if (!EltTy->isSized()) {
435 SkippedLayout = true;
436 EltTy = llvm::Type::getInt8Ty(getLLVMContext());
439 ResultType = llvm::ArrayType::get(EltTy, A->getSize().getZExtValue());
442 case Type::ExtVector:
444 const VectorType *VT = cast<VectorType>(Ty);
445 ResultType = llvm::VectorType::get(ConvertType(VT->getElementType()),
446 VT->getNumElements());
449 case Type::FunctionNoProto:
450 case Type::FunctionProto: {
451 const FunctionType *FT = cast<FunctionType>(Ty);
452 // First, check whether we can build the full function type. If the
453 // function type depends on an incomplete type (e.g. a struct or enum), we
454 // cannot lower the function type.
455 if (!isFuncTypeConvertible(FT)) {
456 // This function's type depends on an incomplete tag type.
457 // Return a placeholder type.
458 ResultType = llvm::StructType::get(getLLVMContext());
460 SkippedLayout = true;
464 // While we're converting the argument types for a function, we don't want
465 // to recursively convert any pointed-to structs. Converting directly-used
466 // structs is ok though.
467 if (!RecordsBeingLaidOut.insert(Ty)) {
468 ResultType = llvm::StructType::get(getLLVMContext());
470 SkippedLayout = true;
474 // The function type can be built; call the appropriate routines to
476 const CGFunctionInfo *FI;
478 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) {
479 FI = &getFunctionInfo(
480 CanQual<FunctionProtoType>::CreateUnsafe(QualType(FPT, 0)));
481 isVariadic = FPT->isVariadic();
483 const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(FT);
484 FI = &getFunctionInfo(
485 CanQual<FunctionNoProtoType>::CreateUnsafe(QualType(FNPT, 0)));
489 // If there is something higher level prodding our CGFunctionInfo, then
490 // don't recurse into it again.
491 if (FunctionsBeingProcessed.count(FI)) {
493 ResultType = llvm::StructType::get(getLLVMContext());
494 SkippedLayout = true;
497 // Otherwise, we're good to go, go ahead and convert it.
498 ResultType = GetFunctionType(*FI, isVariadic);
501 RecordsBeingLaidOut.erase(Ty);
506 if (RecordsBeingLaidOut.empty())
507 while (!DeferredRecords.empty())
508 ConvertRecordDeclType(DeferredRecords.pop_back_val());
512 case Type::ObjCObject:
513 ResultType = ConvertType(cast<ObjCObjectType>(Ty)->getBaseType());
516 case Type::ObjCInterface: {
517 // Objective-C interfaces are always opaque (outside of the
518 // runtime, which can do whatever it likes); we never refine
520 llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(Ty)];
522 T = llvm::StructType::create(getLLVMContext());
527 case Type::ObjCObjectPointer: {
528 // Protocol qualifications do not influence the LLVM type, we just return a
529 // pointer to the underlying interface type. We don't need to worry about
530 // recursive conversion.
532 ConvertTypeForMem(cast<ObjCObjectPointerType>(Ty)->getPointeeType());
533 ResultType = T->getPointerTo();
538 const EnumDecl *ED = cast<EnumType>(Ty)->getDecl();
539 if (ED->isCompleteDefinition() || ED->isFixed())
540 return ConvertType(ED->getIntegerType());
541 // Return a placeholder 'i32' type. This can be changed later when the
542 // type is defined (see UpdateCompletedType), but is likely to be the
544 ResultType = llvm::Type::getInt32Ty(getLLVMContext());
548 case Type::BlockPointer: {
549 const QualType FTy = cast<BlockPointerType>(Ty)->getPointeeType();
550 llvm::Type *PointeeType = ConvertTypeForMem(FTy);
551 unsigned AS = Context.getTargetAddressSpace(FTy);
552 ResultType = llvm::PointerType::get(PointeeType, AS);
556 case Type::MemberPointer: {
558 getCXXABI().ConvertMemberPointerType(cast<MemberPointerType>(Ty));
563 ResultType = ConvertTypeForMem(cast<AtomicType>(Ty)->getValueType());
568 assert(ResultType && "Didn't convert a type?");
570 TypeCache[Ty] = ResultType;
574 /// ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
575 llvm::StructType *CodeGenTypes::ConvertRecordDeclType(const RecordDecl *RD) {
576 // TagDecl's are not necessarily unique, instead use the (clang)
577 // type connected to the decl.
578 const Type *Key = Context.getTagDeclType(RD).getTypePtr();
580 llvm::StructType *&Entry = RecordDeclTypes[Key];
582 // If we don't have a StructType at all yet, create the forward declaration.
584 Entry = llvm::StructType::create(getLLVMContext());
585 addRecordTypeName(RD, Entry, "");
587 llvm::StructType *Ty = Entry;
589 // If this is still a forward declaration, or the LLVM type is already
590 // complete, there's nothing more to do.
591 RD = RD->getDefinition();
592 if (RD == 0 || !RD->isCompleteDefinition() || !Ty->isOpaque())
595 // If converting this type would cause us to infinitely loop, don't do it!
596 if (!isSafeToConvert(RD, *this)) {
597 DeferredRecords.push_back(RD);
601 // Okay, this is a definition of a type. Compile the implementation now.
602 bool InsertResult = RecordsBeingLaidOut.insert(Key); (void)InsertResult;
603 assert(InsertResult && "Recursively compiling a struct?");
605 // Force conversion of non-virtual base classes recursively.
606 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
607 for (CXXRecordDecl::base_class_const_iterator i = CRD->bases_begin(),
608 e = CRD->bases_end(); i != e; ++i) {
609 if (i->isVirtual()) continue;
611 ConvertRecordDeclType(i->getType()->getAs<RecordType>()->getDecl());
616 CGRecordLayout *Layout = ComputeRecordLayout(RD, Ty);
617 CGRecordLayouts[Key] = Layout;
619 // We're done laying out this struct.
620 bool EraseResult = RecordsBeingLaidOut.erase(Key); (void)EraseResult;
621 assert(EraseResult && "struct not in RecordsBeingLaidOut set?");
623 // If this struct blocked a FunctionType conversion, then recompute whatever
624 // was derived from that.
625 // FIXME: This is hugely overconservative.
629 // If we're done converting the outer-most record, then convert any deferred
631 if (RecordsBeingLaidOut.empty())
632 while (!DeferredRecords.empty())
633 ConvertRecordDeclType(DeferredRecords.pop_back_val());
638 /// getCGRecordLayout - Return record layout info for the given record decl.
639 const CGRecordLayout &
640 CodeGenTypes::getCGRecordLayout(const RecordDecl *RD) {
641 const Type *Key = Context.getTagDeclType(RD).getTypePtr();
643 const CGRecordLayout *Layout = CGRecordLayouts.lookup(Key);
645 // Compute the type information.
646 ConvertRecordDeclType(RD);
649 Layout = CGRecordLayouts.lookup(Key);
652 assert(Layout && "Unable to find record layout information for type");
656 bool CodeGenTypes::isZeroInitializable(QualType T) {
657 // No need to check for member pointers when not compiling C++.
658 if (!Context.getLangOptions().CPlusPlus)
661 T = Context.getBaseElementType(T);
663 // Records are non-zero-initializable if they contain any
664 // non-zero-initializable subobjects.
665 if (const RecordType *RT = T->getAs<RecordType>()) {
666 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
667 return isZeroInitializable(RD);
670 // We have to ask the ABI about member pointers.
671 if (const MemberPointerType *MPT = T->getAs<MemberPointerType>())
672 return getCXXABI().isZeroInitializable(MPT);
674 // Everything else is okay.
678 bool CodeGenTypes::isZeroInitializable(const CXXRecordDecl *RD) {
679 return getCGRecordLayout(RD).isZeroInitializable();