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Go back to asking CodeGenTypes whether a type is zero-initializable. 

Make CGT defer to the ABI on all member pointer types.
This requires giving CGT a handle to the ABI.
It's way easier to make that work if we avoid lazily creating the ABI.
Make it so.

llvm-svn: 111786
This commit is contained in:
John McCall 2010-08-22 21:01:12 +00:00
parent 0b84914da0
commit 614dbdcd55
13 changed files with 96 additions and 118 deletions
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9
clang/lib/CodeGen/CGCXX.cpp
View File

@ -393,10 +393,7 @@ llvm::Constant *CGCXXABI::EmitMemberFunctionPointer(const CXXMethodDecl *MD) {
MD->getParent()->getTypeForDecl()));
}
bool CGCXXABI::RequiresNonZeroInitializer(QualType T) {
return false;
}
bool CGCXXABI::RequiresNonZeroInitializer(const CXXRecordDecl *D) {
return RequiresNonZeroInitializer(QualType(D->getTypeForDecl(), 0));
bool CGCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
// Fake answer.
return true;
}

8
clang/lib/CodeGen/CGCXXABI.h
View File

@ -59,10 +59,10 @@ public:
// Manipulations on constant expressions.
/// \brief Returns true if zero-initializing the given type requires
/// a constant other than the LLVM null value.
virtual bool RequiresNonZeroInitializer(QualType T);
virtual bool RequiresNonZeroInitializer(const CXXRecordDecl *D);
/// \brief Returns true if the given member pointer can be
/// zero-initialized (in the C++ sense) with an LLVM
/// zeroinitialized.
virtual bool isZeroInitializable(const MemberPointerType *MPT);
virtual llvm::Constant *
EmitMemberFunctionPointerConversion(llvm::Constant *C,

3
clang/lib/CodeGen/CGExprCXX.cpp
View File

@ -547,8 +547,7 @@ static void EmitNewInitializer(CodeGenFunction &CGF, const CXXNewExpr *E,
if (!E->hasInitializer() || Ctor->getParent()->isEmpty())
return;
if (!CGF.CGM.getCXXABI().RequiresNonZeroInitializer(
E->getAllocatedType())) {
if (CGF.CGM.getTypes().isZeroInitializable(E->getAllocatedType())) {
// Optimization: since zero initialization will just set the memory
// to all zeroes, generate a single memset to do it in one shot.
EmitZeroMemSet(CGF, E->getAllocatedType(), NewPtr,

12
clang/lib/CodeGen/CGExprConstant.cpp
View File

@ -958,8 +958,7 @@ FillInNullDataMemberPointers(CodeGenModule &CGM, QualType T,
uint64_t StartOffset) {
assert(StartOffset % 8 == 0 && "StartOffset not byte aligned!");
if (!CGM.getLangOptions().CPlusPlus ||
!CGM.getCXXABI().RequiresNonZeroInitializer(T))
if (CGM.getTypes().isZeroInitializable(T))
return;
if (const ConstantArrayType *CAT =
@ -992,7 +991,7 @@ FillInNullDataMemberPointers(CodeGenModule &CGM, QualType T,
continue;
// Ignore bases that don't have any pointer to data members.
if (!CGM.getCXXABI().RequiresNonZeroInitializer(BaseDecl))
if (CGM.getTypes().isZeroInitializable(BaseDecl))
continue;
uint64_t BaseOffset = Layout.getBaseClassOffset(BaseDecl);
@ -1006,7 +1005,7 @@ FillInNullDataMemberPointers(CodeGenModule &CGM, QualType T,
E = RD->field_end(); I != E; ++I, ++FieldNo) {
QualType FieldType = I->getType();
if (!CGM.getCXXABI().RequiresNonZeroInitializer(FieldType))
if (CGM.getTypes().isZeroInitializable(FieldType))
continue;
uint64_t FieldOffset = StartOffset + Layout.getFieldOffset(FieldNo);
@ -1031,8 +1030,7 @@ FillInNullDataMemberPointers(CodeGenModule &CGM, QualType T,
}
llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) {
if (!getLangOptions().CPlusPlus ||
!getCXXABI().RequiresNonZeroInitializer(T))
if (getTypes().isZeroInitializable(T))
return llvm::Constant::getNullValue(getTypes().ConvertTypeForMem(T));
if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(T)) {
@ -1076,7 +1074,7 @@ llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) {
continue;
// Ignore bases that don't have any pointer to data members.
if (!getCXXABI().RequiresNonZeroInitializer(BaseDecl))
if (getTypes().isZeroInitializable(BaseDecl))
continue;
// Currently, all bases are arrays of i8. Figure out how many elements

13
clang/lib/CodeGen/CGRecordLayout.h
View File

@ -174,20 +174,21 @@ private:
/// Whether one of the fields in this record layout is a pointer to data
/// member, or a struct that contains pointer to data member.
bool ContainsPointerToDataMember : 1;
bool IsZeroInitializable : 1;
public:
CGRecordLayout(const llvm::Type *T, bool ContainsPointerToDataMember)
: LLVMType(T), ContainsPointerToDataMember(ContainsPointerToDataMember) {}
CGRecordLayout(const llvm::Type *T, bool IsZeroInitializable)
: LLVMType(T), IsZeroInitializable(IsZeroInitializable) {}
/// \brief Return the LLVM type associated with this record.
const llvm::Type *getLLVMType() const {
return LLVMType;
}
/// \brief Check whether this struct contains pointers to data members.
bool containsPointerToDataMember() const {
return ContainsPointerToDataMember;
/// \brief Check whether this struct can be C++ zero-initialized
/// with a zeroinitializer.
bool isZeroInitializable() const {
return IsZeroInitializable;
}
/// \brief Return llvm::StructType element number that corresponds to the

47
clang/lib/CodeGen/CGRecordLayoutBuilder.cpp
View File

@ -18,6 +18,7 @@
#include "clang/AST/Expr.h"
#include "clang/AST/RecordLayout.h"
#include "CodeGenTypes.h"
#include "CGCXXABI.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Type.h"
#include "llvm/Support/Debug.h"
@ -45,10 +46,9 @@ public:
typedef std::pair<const CXXRecordDecl *, unsigned> LLVMBaseInfo;
llvm::SmallVector<LLVMBaseInfo, 16> LLVMNonVirtualBases;
/// ContainsPointerToDataMember - Whether one of the fields in this record
/// layout is a pointer to data member, or a struct that contains pointer to
/// data member.
bool ContainsPointerToDataMember;
/// IsZeroInitializable - Whether this struct can be C++
/// zero-initialized with an LLVM zeroinitializer.
bool IsZeroInitializable;
/// Packed - Whether the resulting LLVM struct will be packed or not.
bool Packed;
@ -115,14 +115,14 @@ private:
unsigned getTypeAlignment(const llvm::Type *Ty) const;
/// CheckForPointerToDataMember - Check if the given type contains a pointer
/// CheckZeroInitializable - Check if the given type contains a pointer
/// to data member.
void CheckForPointerToDataMember(QualType T);
void CheckForPointerToDataMember(const CXXRecordDecl *RD);
void CheckZeroInitializable(QualType T);
void CheckZeroInitializable(const CXXRecordDecl *RD);
public:
CGRecordLayoutBuilder(CodeGenTypes &Types)
: ContainsPointerToDataMember(false), Packed(false), Types(Types),
: IsZeroInitializable(true), Packed(false), Types(Types),
Alignment(0), AlignmentAsLLVMStruct(1),
BitsAvailableInLastField(0), NextFieldOffsetInBytes(0) { }
@ -311,8 +311,7 @@ bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D,
return true;
}
// Check if we have a pointer to data member in this field.
CheckForPointerToDataMember(D->getType());
CheckZeroInitializable(D->getType());
assert(FieldOffset % 8 == 0 && "FieldOffset is not on a byte boundary!");
uint64_t FieldOffsetInBytes = FieldOffset / 8;
@ -458,7 +457,7 @@ void CGRecordLayoutBuilder::LayoutNonVirtualBase(const CXXRecordDecl *BaseDecl,
return;
}
CheckForPointerToDataMember(BaseDecl);
CheckZeroInitializable(BaseDecl);
// FIXME: Actually use a better type than [sizeof(BaseDecl) x i8] when we can.
AppendPadding(BaseOffset / 8, 1);
@ -603,9 +602,9 @@ unsigned CGRecordLayoutBuilder::getTypeAlignment(const llvm::Type *Ty) const {
return Types.getTargetData().getABITypeAlignment(Ty);
}
void CGRecordLayoutBuilder::CheckForPointerToDataMember(QualType T) {
void CGRecordLayoutBuilder::CheckZeroInitializable(QualType T) {
// This record already contains a member pointer.
if (ContainsPointerToDataMember)
if (!IsZeroInitializable)
return;
// Can only have member pointers if we're compiling C++.
@ -615,21 +614,17 @@ void CGRecordLayoutBuilder::CheckForPointerToDataMember(QualType T) {
T = Types.getContext().getBaseElementType(T);
if (const MemberPointerType *MPT = T->getAs<MemberPointerType>()) {
if (!MPT->getPointeeType()->isFunctionType()) {
// We have a pointer to data member.
ContainsPointerToDataMember = true;
}
if (!Types.getCXXABI().isZeroInitializable(MPT))
IsZeroInitializable = false;
} else if (const RecordType *RT = T->getAs<RecordType>()) {
const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
return CheckForPointerToDataMember(RD);
CheckZeroInitializable(RD);
}
}
void
CGRecordLayoutBuilder::CheckForPointerToDataMember(const CXXRecordDecl *RD) {
void CGRecordLayoutBuilder::CheckZeroInitializable(const CXXRecordDecl *RD) {
// This record already contains a member pointer.
if (ContainsPointerToDataMember)
if (!IsZeroInitializable)
return;
// FIXME: It would be better if there was a way to explicitly compute the
@ -638,8 +633,8 @@ CGRecordLayoutBuilder::CheckForPointerToDataMember(const CXXRecordDecl *RD) {
const CGRecordLayout &Layout = Types.getCGRecordLayout(RD);
if (Layout.containsPointerToDataMember())
ContainsPointerToDataMember = true;
if (!Layout.isZeroInitializable())
IsZeroInitializable = false;
}
CGRecordLayout *CodeGenTypes::ComputeRecordLayout(const RecordDecl *D) {
@ -652,7 +647,7 @@ CGRecordLayout *CodeGenTypes::ComputeRecordLayout(const RecordDecl *D) {
Builder.Packed);
CGRecordLayout *RL =
new CGRecordLayout(Ty, Builder.ContainsPointerToDataMember);
new CGRecordLayout(Ty, Builder.IsZeroInitializable);
// Add all the non-virtual base field numbers.
RL->NonVirtualBaseFields.insert(Builder.LLVMNonVirtualBases.begin(),
@ -723,7 +718,7 @@ CGRecordLayout *CodeGenTypes::ComputeRecordLayout(const RecordDecl *D) {
void CGRecordLayout::print(llvm::raw_ostream &OS) const {
OS << "<CGRecordLayout\n";
OS << " LLVMType:" << *LLVMType << "\n";
OS << " ContainsPointerToDataMember:" << ContainsPointerToDataMember << "\n";
OS << " IsZeroInitializable:" << IsZeroInitializable << "\n";
OS << " BitFields:[\n";
// Print bit-field infos in declaration order.

3
clang/lib/CodeGen/CodeGenFunction.cpp
View File

@ -579,8 +579,7 @@ CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
// If the type contains a pointer to data member we can't memset it to zero.
// Instead, create a null constant and copy it to the destination.
if (CGM.getLangOptions().CPlusPlus &&
CGM.getCXXABI().RequiresNonZeroInitializer(Ty)) {
if (!CGM.getTypes().isZeroInitializable(Ty)) {
llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty);
llvm::GlobalVariable *NullVariable =

36
clang/lib/CodeGen/CodeGenModule.cpp
View File

@ -41,6 +41,17 @@
using namespace clang;
using namespace CodeGen;
static CGCXXABI &createCXXABI(CodeGenModule &CGM) {
switch (CGM.getContext().Target.getCXXABI()) {
case CXXABI_ARM: return *CreateARMCXXABI(CGM);
case CXXABI_Itanium: return *CreateItaniumCXXABI(CGM);
case CXXABI_Microsoft: return *CreateMicrosoftCXXABI(CGM);
}
llvm_unreachable("invalid C++ ABI kind");
return *CreateItaniumCXXABI(CGM);
}
CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
llvm::Module &M, const llvm::TargetData &TD,
@ -48,8 +59,9 @@ CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
: BlockModule(C, M, TD, Types, *this), Context(C),
Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M),
TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags),
Types(C, M, TD, getTargetCodeGenInfo().getABIInfo()),
VTables(*this), Runtime(0), ABI(0),
ABI(createCXXABI(*this)),
Types(C, M, TD, getTargetCodeGenInfo().getABIInfo(), ABI),
VTables(*this), Runtime(0),
CFConstantStringClassRef(0), NSConstantStringClassRef(0),
VMContext(M.getContext()),
NSConcreteGlobalBlockDecl(0), NSConcreteStackBlockDecl(0),
@ -66,17 +78,13 @@ CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
else
Runtime = CreateMacObjCRuntime(*this);
if (!Features.CPlusPlus)
ABI = 0;
else createCXXABI();
// If debug info generation is enabled, create the CGDebugInfo object.
DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0;
}
CodeGenModule::~CodeGenModule() {
delete Runtime;
delete ABI;
delete &ABI;
delete DebugInfo;
}
@ -89,20 +97,6 @@ void CodeGenModule::createObjCRuntime() {
Runtime = CreateMacObjCRuntime(*this);
}
void CodeGenModule::createCXXABI() {
switch (Context.Target.getCXXABI()) {
case CXXABI_ARM:
ABI = CreateARMCXXABI(*this);
break;
case CXXABI_Itanium:
ABI = CreateItaniumCXXABI(*this);
break;
case CXXABI_Microsoft:
ABI = CreateMicrosoftCXXABI(*this);
break;
}
}
void CodeGenModule::Release() {
EmitDeferred();
EmitCXXGlobalInitFunc();

18
clang/lib/CodeGen/CodeGenModule.h
View File

@ -109,6 +109,7 @@ class CodeGenModule : public BlockModule {
const llvm::TargetData &TheTargetData;
mutable const TargetCodeGenInfo *TheTargetCodeGenInfo;
Diagnostic &Diags;
CGCXXABI &ABI;
CodeGenTypes Types;
/// VTables - Holds information about C++ vtables.
@ -116,7 +117,6 @@ class CodeGenModule : public BlockModule {
friend class CodeGenVTables;
CGObjCRuntime* Runtime;
CGCXXABI* ABI;
CGDebugInfo* DebugInfo;
// WeakRefReferences - A set of references that have only been seen via
@ -189,8 +189,6 @@ class CodeGenModule : public BlockModule {
/// Lazily create the Objective-C runtime
void createObjCRuntime();
/// Lazily create the C++ ABI
void createCXXABI();
llvm::LLVMContext &VMContext;
@ -228,15 +226,8 @@ public:
/// been configured.
bool hasObjCRuntime() { return !!Runtime; }
/// getCXXABI() - Return a reference to the configured
/// C++ ABI.
CGCXXABI &getCXXABI() {
if (!ABI) createCXXABI();
return *ABI;
}
/// hasCXXABI() - Return true iff a C++ ABI has been configured.
bool hasCXXABI() { return !!ABI; }
/// getCXXABI() - Return a reference to the configured C++ ABI.
CGCXXABI &getCXXABI() { return ABI; }
llvm::Value *getStaticLocalDeclAddress(const VarDecl *VD) {
return StaticLocalDeclMap[VD];
@ -253,8 +244,7 @@ public:
llvm::Module &getModule() const { return TheModule; }
CodeGenTypes &getTypes() { return Types; }
MangleContext &getMangleContext() {
if (!ABI) createCXXABI();
return ABI->getMangleContext();
return ABI.getMangleContext();
}
CodeGenVTables &getVTables() { return VTables; }
Diagnostic &getDiags() const { return Diags; }

27
clang/lib/CodeGen/CodeGenTypes.cpp
View File

@ -13,6 +13,7 @@
#include "CodeGenTypes.h"
#include "CGCall.h"
#include "CGCXXABI.h"
#include "CGRecordLayout.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
@ -26,9 +27,10 @@ using namespace clang;
using namespace CodeGen;
CodeGenTypes::CodeGenTypes(ASTContext &Ctx, llvm::Module& M,
const llvm::TargetData &TD, const ABIInfo &Info)
const llvm::TargetData &TD, const ABIInfo &Info,
CGCXXABI &CXXABI)
: Context(Ctx), Target(Ctx.Target), TheModule(M), TheTargetData(TD),
TheABIInfo(Info) {
TheABIInfo(Info), TheCXXABI(CXXABI) {
}
CodeGenTypes::~CodeGenTypes() {
@ -491,31 +493,34 @@ CodeGenTypes::getCGRecordLayout(const RecordDecl *TD) const {
return *Layout;
}
bool CodeGenTypes::ContainsPointerToDataMember(QualType T) {
bool CodeGenTypes::isZeroInitializable(QualType T) {
// No need to check for member pointers when not compiling C++.
if (!Context.getLangOptions().CPlusPlus)
return false;
return true;
T = Context.getBaseElementType(T);
// Records are non-zero-initializable if they contain any
// non-zero-initializable subobjects.
if (const RecordType *RT = T->getAs<RecordType>()) {
const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
return ContainsPointerToDataMember(RD);
return isZeroInitializable(RD);
}
// We have to ask the ABI about member pointers.
if (const MemberPointerType *MPT = T->getAs<MemberPointerType>())
return !MPT->getPointeeType()->isFunctionType();
return getCXXABI().isZeroInitializable(MPT);
return false;
// Everything else is okay.
return true;
}
bool CodeGenTypes::ContainsPointerToDataMember(const CXXRecordDecl *RD) {
bool CodeGenTypes::isZeroInitializable(const CXXRecordDecl *RD) {
// FIXME: It would be better if there was a way to explicitly compute the
// record layout instead of converting to a type.
ConvertTagDeclType(RD);
const CGRecordLayout &Layout = getCGRecordLayout(RD);
return Layout.containsPointerToDataMember();
return Layout.isZeroInitializable();
}

17
clang/lib/CodeGen/CodeGenTypes.h
View File

@ -50,6 +50,7 @@ namespace clang {
typedef CanQual<Type> CanQualType;
namespace CodeGen {
class CGCXXABI;
class CGRecordLayout;
/// CodeGenTypes - This class organizes the cross-module state that is used
@ -60,6 +61,7 @@ class CodeGenTypes {
llvm::Module& TheModule;
const llvm::TargetData& TheTargetData;
const ABIInfo& TheABIInfo;
CGCXXABI &TheCXXABI;
llvm::SmallVector<std::pair<QualType,
llvm::OpaqueType *>, 8> PointersToResolve;
@ -101,13 +103,14 @@ private:
public:
CodeGenTypes(ASTContext &Ctx, llvm::Module &M, const llvm::TargetData &TD,
const ABIInfo &Info);
const ABIInfo &Info, CGCXXABI &CXXABI);
~CodeGenTypes();
const llvm::TargetData &getTargetData() const { return TheTargetData; }
const TargetInfo &getTarget() const { return Target; }
ASTContext &getContext() const { return Context; }
const ABIInfo &getABIInfo() const { return TheABIInfo; }
CGCXXABI &getCXXABI() const { return TheCXXABI; }
llvm::LLVMContext &getLLVMContext() { return TheModule.getContext(); }
/// ConvertType - Convert type T into a llvm::Type.
@ -204,13 +207,13 @@ public: // These are internal details of CGT that shouldn't be used externally.
void GetExpandedTypes(QualType Ty, std::vector<const llvm::Type*> &ArgTys,
bool IsRecursive);
/// ContainsPointerToDataMember - Return whether the given type contains a
/// pointer to a data member.
bool ContainsPointerToDataMember(QualType T);
/// IsZeroInitializable - Return whether a type can be
/// zero-initialized (in the C++ sense) with an LLVM zeroinitializer.
bool isZeroInitializable(QualType T);
/// ContainsPointerToDataMember - Return whether the record decl contains a
/// pointer to a data member.
bool ContainsPointerToDataMember(const CXXRecordDecl *RD);
/// IsZeroInitializable - Return whether a record type can be
/// zero-initialized (in the C++ sense) with an LLVM zeroinitializer.
bool isZeroInitializable(const CXXRecordDecl *RD);
};
} // end namespace CodeGen

13
clang/lib/CodeGen/ItaniumCXXABI.cpp
View File

@ -41,8 +41,7 @@ public:
return MangleCtx;
}
bool RequiresNonZeroInitializer(QualType T);
bool RequiresNonZeroInitializer(const CXXRecordDecl *D);
bool isZeroInitializable(const MemberPointerType *MPT);
llvm::Value *EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
llvm::Value *&This,
@ -460,10 +459,8 @@ ItaniumCXXABI::EmitMemberFunctionPointerIsNotNull(CodeGenFunction &CGF,
return Result;
}
bool ItaniumCXXABI::RequiresNonZeroInitializer(QualType T) {
return CGM.getTypes().ContainsPointerToDataMember(T);
}
bool ItaniumCXXABI::RequiresNonZeroInitializer(const CXXRecordDecl *D) {
return CGM.getTypes().ContainsPointerToDataMember(D);
/// The Itanium ABI requires non-zero initialization only for data
/// member pointers, for which '0' is a valid offset.
bool ItaniumCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
return MPT->getPointeeType()->isFunctionType();
}

8
clang/test/CodeGen/bitfield-2.c
View File

@ -12,7 +12,7 @@
// CHECK-RECORD: Record: struct s0
// CHECK-RECORD: Layout: <CGRecordLayout
// CHECK-RECORD: LLVMType:<{ [3 x i8] }>
// CHECK-RECORD: ContainsPointerToDataMember:0
// CHECK-RECORD: IsZeroInitializable:1
// CHECK-RECORD: BitFields:[
// CHECK-RECORD: <CGBitFieldInfo Size:24 IsSigned:1
// CHECK-RECORD: NumComponents:2 Components: [
@ -57,7 +57,7 @@ unsigned long long test_0() {
// CHECK-RECORD: Record: struct s1
// CHECK-RECORD: Layout: <CGRecordLayout
// CHECK-RECORD: LLVMType:<{ [2 x i8], i8 }>
// CHECK-RECORD: ContainsPointerToDataMember:0
// CHECK-RECORD: IsZeroInitializable:1
// CHECK-RECORD: BitFields:[
// CHECK-RECORD: <CGBitFieldInfo Size:10 IsSigned:1
// CHECK-RECORD: NumComponents:1 Components: [
@ -114,7 +114,7 @@ unsigned long long test_1() {
// CHECK-RECORD: Record: union u2
// CHECK-RECORD: Layout: <CGRecordLayout
// CHECK-RECORD: LLVMType:<{ i8 }>
// CHECK-RECORD: ContainsPointerToDataMember:0
// CHECK-RECORD: IsZeroInitializable:1
// CHECK-RECORD: BitFields:[
// CHECK-RECORD: <CGBitFieldInfo Size:3 IsSigned:0
// CHECK-RECORD: NumComponents:1 Components: [
@ -289,7 +289,7 @@ _Bool test_6() {
// CHECK-RECORD: Record: struct s7
// CHECK-RECORD: Layout: <CGRecordLayout
// CHECK-RECORD: LLVMType:{ i32, i32, i32, i8, [3 x i8], [4 x i8], [12 x i8] }
// CHECK-RECORD: ContainsPointerToDataMember:0
// CHECK-RECORD: IsZeroInitializable:1
// CHECK-RECORD: BitFields:[
// CHECK-RECORD: <CGBitFieldInfo Size:5 IsSigned:1
// CHECK-RECORD: NumComponents:1 Components: [