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llvm-project/clang/lib/AST/ASTContext.cpp

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//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the ASTContext interface.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExternalASTSource.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace clang;
enum FloatingRank {
FloatRank, DoubleRank, LongDoubleRank
};
ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM,
TargetInfo &t,
IdentifierTable &idents, SelectorTable &sels,
bool FreeMem, unsigned size_reserve,
bool InitializeBuiltins) :
GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0),
ObjCFastEnumerationStateTypeDecl(0), SourceMgr(SM), LangOpts(LOpts),
FreeMemory(FreeMem), Target(t), Idents(idents), Selectors(sels),
ExternalSource(0) {
if (size_reserve > 0) Types.reserve(size_reserve);
InitBuiltinTypes();
TUDecl = TranslationUnitDecl::Create(*this);
BuiltinInfo.InitializeTargetBuiltins(Target);
if (InitializeBuiltins)
this->InitializeBuiltins(idents);
}
ASTContext::~ASTContext() {
// Deallocate all the types.
while (!Types.empty()) {
Types.back()->Destroy(*this);
Types.pop_back();
}
{
llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator
I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end();
while (I != E) {
ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second);
delete R;
}
}
{
llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator
I = ObjCLayouts.begin(), E = ObjCLayouts.end();
while (I != E) {
ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second);
delete R;
}
}
// Destroy nested-name-specifiers.
for (llvm::FoldingSet<NestedNameSpecifier>::iterator
NNS = NestedNameSpecifiers.begin(),
NNSEnd = NestedNameSpecifiers.end();
NNS != NNSEnd;
/* Increment in loop */)
(*NNS++).Destroy(*this);
if (GlobalNestedNameSpecifier)
GlobalNestedNameSpecifier->Destroy(*this);
TUDecl->Destroy(*this);
}
void ASTContext::InitializeBuiltins(IdentifierTable &idents) {
BuiltinInfo.InitializeBuiltins(idents, LangOpts.NoBuiltin);
}
void
ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) {
ExternalSource.reset(Source.take());
}
void ASTContext::PrintStats() const {
fprintf(stderr, "*** AST Context Stats:\n");
fprintf(stderr, " %d types total.\n", (int)Types.size());
unsigned NumBuiltin = 0, NumPointer = 0, NumArray = 0, NumFunctionP = 0;
unsigned NumVector = 0, NumComplex = 0, NumBlockPointer = 0;
unsigned NumFunctionNP = 0, NumTypeName = 0, NumTagged = 0;
unsigned NumLValueReference = 0, NumRValueReference = 0, NumMemberPointer = 0;
unsigned NumTagStruct = 0, NumTagUnion = 0, NumTagEnum = 0, NumTagClass = 0;
unsigned NumObjCInterfaces = 0, NumObjCQualifiedInterfaces = 0;
unsigned NumObjCQualifiedIds = 0;
unsigned NumTypeOfTypes = 0, NumTypeOfExprTypes = 0;
unsigned NumExtQual = 0;
for (unsigned i = 0, e = Types.size(); i != e; ++i) {
Type *T = Types[i];
if (isa<BuiltinType>(T))
++NumBuiltin;
else if (isa<PointerType>(T))
++NumPointer;
else if (isa<BlockPointerType>(T))
++NumBlockPointer;
else if (isa<LValueReferenceType>(T))
++NumLValueReference;
else if (isa<RValueReferenceType>(T))
++NumRValueReference;
else if (isa<MemberPointerType>(T))
++NumMemberPointer;
else if (isa<ComplexType>(T))
++NumComplex;
else if (isa<ArrayType>(T))
++NumArray;
else if (isa<VectorType>(T))
++NumVector;
else if (isa<FunctionNoProtoType>(T))
++NumFunctionNP;
else if (isa<FunctionProtoType>(T))
++NumFunctionP;
else if (isa<TypedefType>(T))
++NumTypeName;
else if (TagType *TT = dyn_cast<TagType>(T)) {
++NumTagged;
switch (TT->getDecl()->getTagKind()) {
default: assert(0 && "Unknown tagged type!");
case TagDecl::TK_struct: ++NumTagStruct; break;
case TagDecl::TK_union: ++NumTagUnion; break;
case TagDecl::TK_class: ++NumTagClass; break;
case TagDecl::TK_enum: ++NumTagEnum; break;
}
} else if (isa<ObjCInterfaceType>(T))
++NumObjCInterfaces;
else if (isa<ObjCQualifiedInterfaceType>(T))
++NumObjCQualifiedInterfaces;
else if (isa<ObjCQualifiedIdType>(T))
++NumObjCQualifiedIds;
else if (isa<TypeOfType>(T))
++NumTypeOfTypes;
else if (isa<TypeOfExprType>(T))
++NumTypeOfExprTypes;
else if (isa<ExtQualType>(T))
++NumExtQual;
else {
QualType(T, 0).dump();
assert(0 && "Unknown type!");
}
}
fprintf(stderr, " %d builtin types\n", NumBuiltin);
fprintf(stderr, " %d pointer types\n", NumPointer);
fprintf(stderr, " %d block pointer types\n", NumBlockPointer);
fprintf(stderr, " %d lvalue reference types\n", NumLValueReference);
fprintf(stderr, " %d rvalue reference types\n", NumRValueReference);
fprintf(stderr, " %d member pointer types\n", NumMemberPointer);
fprintf(stderr, " %d complex types\n", NumComplex);
fprintf(stderr, " %d array types\n", NumArray);
fprintf(stderr, " %d vector types\n", NumVector);
fprintf(stderr, " %d function types with proto\n", NumFunctionP);
fprintf(stderr, " %d function types with no proto\n", NumFunctionNP);
fprintf(stderr, " %d typename (typedef) types\n", NumTypeName);
fprintf(stderr, " %d tagged types\n", NumTagged);
fprintf(stderr, " %d struct types\n", NumTagStruct);
fprintf(stderr, " %d union types\n", NumTagUnion);
fprintf(stderr, " %d class types\n", NumTagClass);
fprintf(stderr, " %d enum types\n", NumTagEnum);
fprintf(stderr, " %d interface types\n", NumObjCInterfaces);
fprintf(stderr, " %d protocol qualified interface types\n",
NumObjCQualifiedInterfaces);
fprintf(stderr, " %d protocol qualified id types\n",
NumObjCQualifiedIds);
fprintf(stderr, " %d typeof types\n", NumTypeOfTypes);
fprintf(stderr, " %d typeof exprs\n", NumTypeOfExprTypes);
fprintf(stderr, " %d attribute-qualified types\n", NumExtQual);
fprintf(stderr, "Total bytes = %d\n", int(NumBuiltin*sizeof(BuiltinType)+
NumPointer*sizeof(PointerType)+NumArray*sizeof(ArrayType)+
NumComplex*sizeof(ComplexType)+NumVector*sizeof(VectorType)+
NumLValueReference*sizeof(LValueReferenceType)+
NumRValueReference*sizeof(RValueReferenceType)+
NumMemberPointer*sizeof(MemberPointerType)+
NumFunctionP*sizeof(FunctionProtoType)+
NumFunctionNP*sizeof(FunctionNoProtoType)+
NumTypeName*sizeof(TypedefType)+NumTagged*sizeof(TagType)+
NumTypeOfTypes*sizeof(TypeOfType)+NumTypeOfExprTypes*sizeof(TypeOfExprType)+
NumExtQual*sizeof(ExtQualType)));
if (ExternalSource.get()) {
fprintf(stderr, "\n");
ExternalSource->PrintStats();
}
}
void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) {
Types.push_back((R = QualType(new (*this,8) BuiltinType(K),0)).getTypePtr());
}
void ASTContext::InitBuiltinTypes() {
assert(VoidTy.isNull() && "Context reinitialized?");
// C99 6.2.5p19.
InitBuiltinType(VoidTy, BuiltinType::Void);
// C99 6.2.5p2.
InitBuiltinType(BoolTy, BuiltinType::Bool);
// C99 6.2.5p3.
if (Target.isCharSigned())
InitBuiltinType(CharTy, BuiltinType::Char_S);
else
InitBuiltinType(CharTy, BuiltinType::Char_U);
// C99 6.2.5p4.
InitBuiltinType(SignedCharTy, BuiltinType::SChar);
InitBuiltinType(ShortTy, BuiltinType::Short);
InitBuiltinType(IntTy, BuiltinType::Int);
InitBuiltinType(LongTy, BuiltinType::Long);
InitBuiltinType(LongLongTy, BuiltinType::LongLong);
// C99 6.2.5p6.
InitBuiltinType(UnsignedCharTy, BuiltinType::UChar);
InitBuiltinType(UnsignedShortTy, BuiltinType::UShort);
InitBuiltinType(UnsignedIntTy, BuiltinType::UInt);
InitBuiltinType(UnsignedLongTy, BuiltinType::ULong);
InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong);
// C99 6.2.5p10.
InitBuiltinType(FloatTy, BuiltinType::Float);
InitBuiltinType(DoubleTy, BuiltinType::Double);
InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble);
// GNU extension, 128-bit integers.
InitBuiltinType(Int128Ty, BuiltinType::Int128);
InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128);
if (LangOpts.CPlusPlus) // C++ 3.9.1p5
InitBuiltinType(WCharTy, BuiltinType::WChar);
else // C99
WCharTy = getFromTargetType(Target.getWCharType());
// Placeholder type for functions.
InitBuiltinType(OverloadTy, BuiltinType::Overload);
// Placeholder type for type-dependent expressions whose type is
// completely unknown. No code should ever check a type against
// DependentTy and users should never see it; however, it is here to
// help diagnose failures to properly check for type-dependent
// expressions.
InitBuiltinType(DependentTy, BuiltinType::Dependent);
// C99 6.2.5p11.
FloatComplexTy = getComplexType(FloatTy);
DoubleComplexTy = getComplexType(DoubleTy);
LongDoubleComplexTy = getComplexType(LongDoubleTy);
BuiltinVaListType = QualType();
ObjCIdType = QualType();
IdStructType = 0;
ObjCClassType = QualType();
ClassStructType = 0;
ObjCConstantStringType = QualType();
// void * type
VoidPtrTy = getPointerType(VoidTy);
}
//===----------------------------------------------------------------------===//
// Type Sizing and Analysis
//===----------------------------------------------------------------------===//
/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified
/// scalar floating point type.
const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const {
const BuiltinType *BT = T->getAsBuiltinType();
assert(BT && "Not a floating point type!");
switch (BT->getKind()) {
default: assert(0 && "Not a floating point type!");
case BuiltinType::Float: return Target.getFloatFormat();
case BuiltinType::Double: return Target.getDoubleFormat();
case BuiltinType::LongDouble: return Target.getLongDoubleFormat();
}
}
/// getDeclAlign - Return a conservative estimate of the alignment of the
/// specified decl. Note that bitfields do not have a valid alignment, so
/// this method will assert on them.
unsigned ASTContext::getDeclAlignInBytes(const Decl *D) {
unsigned Align = Target.getCharWidth();
if (const AlignedAttr* AA = D->getAttr<AlignedAttr>())
Align = std::max(Align, AA->getAlignment());
if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
QualType T = VD->getType();
if (const ReferenceType* RT = T->getAsReferenceType()) {
unsigned AS = RT->getPointeeType().getAddressSpace();
Align = Target.getPointerAlign(AS);
} else if (!T->isIncompleteType() && !T->isFunctionType()) {
// Incomplete or function types default to 1.
while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T))
T = cast<ArrayType>(T)->getElementType();
Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr()));
}
}
return Align / Target.getCharWidth();
}
/// getTypeSize - Return the size of the specified type, in bits. This method
/// does not work on incomplete types.
std::pair<uint64_t, unsigned>
ASTContext::getTypeInfo(const Type *T) {
uint64_t Width=0;
unsigned Align=8;
switch (T->getTypeClass()) {
#define TYPE(Class, Base)
#define ABSTRACT_TYPE(Class, Base)
#define NON_CANONICAL_TYPE(Class, Base)
#define DEPENDENT_TYPE(Class, Base) case Type::Class:
#include "clang/AST/TypeNodes.def"
assert(false && "Should not see dependent types");
break;
case Type::FunctionNoProto:
case Type::FunctionProto:
// GCC extension: alignof(function) = 32 bits
Width = 0;
Align = 32;
break;
case Type::IncompleteArray:
case Type::VariableArray:
Width = 0;
Align = getTypeAlign(cast<ArrayType>(T)->getElementType());
break;
case Type::ConstantArray: {
const ConstantArrayType *CAT = cast<ConstantArrayType>(T);
std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType());
Width = EltInfo.first*CAT->getSize().getZExtValue();
Align = EltInfo.second;
break;
}
case Type::ExtVector:
case Type::Vector: {
std::pair<uint64_t, unsigned> EltInfo =
getTypeInfo(cast<VectorType>(T)->getElementType());
Width = EltInfo.first*cast<VectorType>(T)->getNumElements();
Align = Width;
// If the alignment is not a power of 2, round up to the next power of 2.
// This happens for non-power-of-2 length vectors.
// FIXME: this should probably be a target property.
Align = 1 << llvm::Log2_32_Ceil(Align);
break;
}
case Type::Builtin:
switch (cast<BuiltinType>(T)->getKind()) {
default: assert(0 && "Unknown builtin type!");
case BuiltinType::Void:
// GCC extension: alignof(void) = 8 bits.
Width = 0;
Align = 8;
break;
case BuiltinType::Bool:
Width = Target.getBoolWidth();
Align = Target.getBoolAlign();
break;
case BuiltinType::Char_S:
case BuiltinType::Char_U:
case BuiltinType::UChar:
case BuiltinType::SChar:
Width = Target.getCharWidth();
Align = Target.getCharAlign();
break;
case BuiltinType::WChar:
Width = Target.getWCharWidth();
Align = Target.getWCharAlign();
break;
case BuiltinType::UShort:
case BuiltinType::Short:
Width = Target.getShortWidth();
Align = Target.getShortAlign();
break;
case BuiltinType::UInt:
case BuiltinType::Int:
Width = Target.getIntWidth();
Align = Target.getIntAlign();
break;
case BuiltinType::ULong:
case BuiltinType::Long:
Width = Target.getLongWidth();
Align = Target.getLongAlign();
break;
case BuiltinType::ULongLong:
case BuiltinType::LongLong:
Width = Target.getLongLongWidth();
Align = Target.getLongLongAlign();
break;
case BuiltinType::Int128:
case BuiltinType::UInt128:
Width = 128;
Align = 128; // int128_t is 128-bit aligned on all targets.
break;
case BuiltinType::Float:
Width = Target.getFloatWidth();
Align = Target.getFloatAlign();
break;
case BuiltinType::Double:
Width = Target.getDoubleWidth();
Align = Target.getDoubleAlign();
break;
case BuiltinType::LongDouble:
Width = Target.getLongDoubleWidth();
Align = Target.getLongDoubleAlign();
break;
}
break;
case Type::FixedWidthInt:
// FIXME: This isn't precisely correct; the width/alignment should depend
// on the available types for the target
Width = cast<FixedWidthIntType>(T)->getWidth();
Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8);
Align = Width;
break;
case Type::ExtQual:
// FIXME: Pointers into different addr spaces could have different sizes and
// alignment requirements: getPointerInfo should take an AddrSpace.
return getTypeInfo(QualType(cast<ExtQualType>(T)->getBaseType(), 0));
case Type::ObjCQualifiedId:
case Type::ObjCQualifiedInterface:
Width = Target.getPointerWidth(0);
Align = Target.getPointerAlign(0);
break;
case Type::BlockPointer: {
unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace();
Width = Target.getPointerWidth(AS);
Align = Target.getPointerAlign(AS);
break;
}
case Type::Pointer: {
unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace();
Width = Target.getPointerWidth(AS);
Align = Target.getPointerAlign(AS);
break;
}
case Type::LValueReference:
case Type::RValueReference:
// "When applied to a reference or a reference type, the result is the size
// of the referenced type." C++98 5.3.3p2: expr.sizeof.
// FIXME: This is wrong for struct layout: a reference in a struct has
// pointer size.
return getTypeInfo(cast<ReferenceType>(T)->getPointeeType());
case Type::MemberPointer: {
// FIXME: This is not only platform- but also ABI-dependent. We follow
// the GCC ABI, where pointers to data are one pointer large, pointers to
// functions two pointers. But if we want to support ABI compatibility with
// other compilers too, we need to delegate this completely to TargetInfo
// or some ABI abstraction layer.
QualType Pointee = cast<MemberPointerType>(T)->getPointeeType();
unsigned AS = Pointee.getAddressSpace();
Width = Target.getPointerWidth(AS);
if (Pointee->isFunctionType())
Width *= 2;
Align = Target.getPointerAlign(AS);
// GCC aligns at single pointer width.
}
case Type::Complex: {
// Complex types have the same alignment as their elements, but twice the
// size.
std::pair<uint64_t, unsigned> EltInfo =
getTypeInfo(cast<ComplexType>(T)->getElementType());
Width = EltInfo.first*2;
Align = EltInfo.second;
break;
}
case Type::ObjCInterface: {
const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T);
const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl());
Width = Layout.getSize();
Align = Layout.getAlignment();
break;
}
case Type::Record:
case Type::Enum: {
const TagType *TT = cast<TagType>(T);
if (TT->getDecl()->isInvalidDecl()) {
Width = 1;
Align = 1;
break;
}
if (const EnumType *ET = dyn_cast<EnumType>(TT))
return getTypeInfo(ET->getDecl()->getIntegerType());
const RecordType *RT = cast<RecordType>(TT);
const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl());
Width = Layout.getSize();
Align = Layout.getAlignment();
break;
}
case Type::Typedef: {
const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl();
if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) {
Align = Aligned->getAlignment();
Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr());
} else
return getTypeInfo(Typedef->getUnderlyingType().getTypePtr());
break;
}
case Type::TypeOfExpr:
return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType()
.getTypePtr());
case Type::TypeOf:
return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr());
case Type::QualifiedName:
return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr());
case Type::TemplateSpecialization:
assert(getCanonicalType(T) != T &&
"Cannot request the size of a dependent type");
// FIXME: this is likely to be wrong once we support template
// aliases, since a template alias could refer to a typedef that
// has an __aligned__ attribute on it.
return getTypeInfo(getCanonicalType(T));
}
assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2");
return std::make_pair(Width, Align);
}
/// getPreferredTypeAlign - Return the "preferred" alignment of the specified
/// type for the current target in bits. This can be different than the ABI
/// alignment in cases where it is beneficial for performance to overalign
/// a data type.
unsigned ASTContext::getPreferredTypeAlign(const Type *T) {
unsigned ABIAlign = getTypeAlign(T);
// Doubles should be naturally aligned if possible.
if (T->isSpecificBuiltinType(BuiltinType::Double))
return std::max(ABIAlign, 64U);
return ABIAlign;
}
/// LayoutField - Field layout.
void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo,
bool IsUnion, unsigned StructPacking,
ASTContext &Context) {
unsigned FieldPacking = StructPacking;
uint64_t FieldOffset = IsUnion ? 0 : Size;
uint64_t FieldSize;
unsigned FieldAlign;
// FIXME: Should this override struct packing? Probably we want to
// take the minimum?
if (const PackedAttr *PA = FD->getAttr<PackedAttr>())
FieldPacking = PA->getAlignment();
if (const Expr *BitWidthExpr = FD->getBitWidth()) {
// TODO: Need to check this algorithm on other targets!
// (tested on Linux-X86)
FieldSize = BitWidthExpr->EvaluateAsInt(Context).getZExtValue();
std::pair<uint64_t, unsigned> FieldInfo =
Context.getTypeInfo(FD->getType());
uint64_t TypeSize = FieldInfo.first;
// Determine the alignment of this bitfield. The packing
// attributes define a maximum and the alignment attribute defines
// a minimum.
// FIXME: What is the right behavior when the specified alignment
// is smaller than the specified packing?
FieldAlign = FieldInfo.second;
if (FieldPacking)
FieldAlign = std::min(FieldAlign, FieldPacking);
if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>())
FieldAlign = std::max(FieldAlign, AA->getAlignment());
// Check if we need to add padding to give the field the correct
// alignment.
if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize)
FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1);
// Padding members don't affect overall alignment
if (!FD->getIdentifier())
FieldAlign = 1;
} else {
if (FD->getType()->isIncompleteArrayType()) {
// This is a flexible array member; we can't directly
// query getTypeInfo about these, so we figure it out here.
// Flexible array members don't have any size, but they
// have to be aligned appropriately for their element type.
FieldSize = 0;
const ArrayType* ATy = Context.getAsArrayType(FD->getType());
FieldAlign = Context.getTypeAlign(ATy->getElementType());
} else if (const ReferenceType *RT = FD->getType()->getAsReferenceType()) {
unsigned AS = RT->getPointeeType().getAddressSpace();
FieldSize = Context.Target.getPointerWidth(AS);
FieldAlign = Context.Target.getPointerAlign(AS);
} else {
std::pair<uint64_t, unsigned> FieldInfo =
Context.getTypeInfo(FD->getType());
FieldSize = FieldInfo.first;
FieldAlign = FieldInfo.second;
}
// Determine the alignment of this bitfield. The packing
// attributes define a maximum and the alignment attribute defines
// a minimum. Additionally, the packing alignment must be at least
// a byte for non-bitfields.
//
// FIXME: What is the right behavior when the specified alignment
// is smaller than the specified packing?
if (FieldPacking)
FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking));
if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>())
FieldAlign = std::max(FieldAlign, AA->getAlignment());
// Round up the current record size to the field's alignment boundary.
FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1);
}
// Place this field at the current location.
FieldOffsets[FieldNo] = FieldOffset;
// Reserve space for this field.
if (IsUnion) {
Size = std::max(Size, FieldSize);
} else {
Size = FieldOffset + FieldSize;
}
// Remember the next available offset.
NextOffset = Size;
// Remember max struct/class alignment.
Alignment = std::max(Alignment, FieldAlign);
}
static void CollectLocalObjCIvars(ASTContext *Ctx,
const ObjCInterfaceDecl *OI,
llvm::SmallVectorImpl<FieldDecl*> &Fields) {
for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(),
E = OI->ivar_end(); I != E; ++I) {
ObjCIvarDecl *IVDecl = *I;
if (!IVDecl->isInvalidDecl())
Fields.push_back(cast<FieldDecl>(IVDecl));
}
}
void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI,
llvm::SmallVectorImpl<FieldDecl*> &Fields) {
if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass())
CollectObjCIvars(SuperClass, Fields);
CollectLocalObjCIvars(this, OI, Fields);
}
/// getInterfaceLayoutImpl - Get or compute information about the
/// layout of the given interface.
///
/// \param Impl - If given, also include the layout of the interface's
/// implementation. This may differ by including synthesized ivars.
const ASTRecordLayout &
ASTContext::getObjCLayout(const ObjCInterfaceDecl *D,
const ObjCImplementationDecl *Impl) {
assert(!D->isForwardDecl() && "Invalid interface decl!");
// Look up this layout, if already laid out, return what we have.
ObjCContainerDecl *Key =
Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D;
if (const ASTRecordLayout *Entry = ObjCLayouts[Key])
return *Entry;
unsigned FieldCount = D->ivar_size();
// Add in synthesized ivar count if laying out an implementation.
if (Impl) {
for (ObjCInterfaceDecl::prop_iterator I = D->prop_begin(*this),
E = D->prop_end(*this); I != E; ++I)
if ((*I)->getPropertyIvarDecl())
++FieldCount;
// If there aren't any sythesized ivars then reuse the interface
// entry. Note we can't cache this because we simply free all
// entries later; however we shouldn't look up implementations
// frequently.
if (FieldCount == D->ivar_size())
return getObjCLayout(D, 0);
}
ASTRecordLayout *NewEntry = NULL;
if (ObjCInterfaceDecl *SD = D->getSuperClass()) {
const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD);
unsigned Alignment = SL.getAlignment();
// We start laying out ivars not at the end of the superclass
// structure, but at the next byte following the last field.
uint64_t Size = llvm::RoundUpToAlignment(SL.NextOffset, 8);
ObjCLayouts[Key] = NewEntry = new ASTRecordLayout(Size, Alignment);
NewEntry->InitializeLayout(FieldCount);
} else {
ObjCLayouts[Key] = NewEntry = new ASTRecordLayout();
NewEntry->InitializeLayout(FieldCount);
}
unsigned StructPacking = 0;
if (const PackedAttr *PA = D->getAttr<PackedAttr>())
StructPacking = PA->getAlignment();
if (const AlignedAttr *AA = D->getAttr<AlignedAttr>())
NewEntry->SetAlignment(std::max(NewEntry->getAlignment(),
AA->getAlignment()));
// Layout each ivar sequentially.
unsigned i = 0;
for (ObjCInterfaceDecl::ivar_iterator IVI = D->ivar_begin(),
IVE = D->ivar_end(); IVI != IVE; ++IVI) {
const ObjCIvarDecl* Ivar = (*IVI);
NewEntry->LayoutField(Ivar, i++, false, StructPacking, *this);
}
// And synthesized ivars, if this is an implementation.
if (Impl) {
for (ObjCInterfaceDecl::prop_iterator I = D->prop_begin(*this),
E = D->prop_end(*this); I != E; ++I) {
if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl())
NewEntry->LayoutField(Ivar, i++, false, StructPacking, *this);
}
}
// Finally, round the size of the total struct up to the alignment of the
// struct itself.
NewEntry->FinalizeLayout();
return *NewEntry;
}
const ASTRecordLayout &
ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) {
return getObjCLayout(D, 0);
}
const ASTRecordLayout &
ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) {
return getObjCLayout(D->getClassInterface(), D);
}
/// getASTRecordLayout - Get or compute information about the layout of the
/// specified record (struct/union/class), which indicates its size and field
/// position information.
const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) {
D = D->getDefinition(*this);
assert(D && "Cannot get layout of forward declarations!");
// Look up this layout, if already laid out, return what we have.
const ASTRecordLayout *&Entry = ASTRecordLayouts[D];
if (Entry) return *Entry;
// Allocate and assign into ASTRecordLayouts here. The "Entry" reference can
// be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into.
ASTRecordLayout *NewEntry = new ASTRecordLayout();
Entry = NewEntry;
// FIXME: Avoid linear walk through the fields, if possible.
NewEntry->InitializeLayout(std::distance(D->field_begin(*this),
D->field_end(*this)));
bool IsUnion = D->isUnion();
unsigned StructPacking = 0;
if (const PackedAttr *PA = D->getAttr<PackedAttr>())
StructPacking = PA->getAlignment();
if (const AlignedAttr *AA = D->getAttr<AlignedAttr>())
NewEntry->SetAlignment(std::max(NewEntry->getAlignment(),
AA->getAlignment()));
// Layout each field, for now, just sequentially, respecting alignment. In
// the future, this will need to be tweakable by targets.
unsigned FieldIdx = 0;
for (RecordDecl::field_iterator Field = D->field_begin(*this),
FieldEnd = D->field_end(*this);
Field != FieldEnd; (void)++Field, ++FieldIdx)
NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this);
// Finally, round the size of the total struct up to the alignment of the
// struct itself.
NewEntry->FinalizeLayout();
return *NewEntry;
}
//===----------------------------------------------------------------------===//
// Type creation/memoization methods
//===----------------------------------------------------------------------===//
QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) {
QualType CanT = getCanonicalType(T);
if (CanT.getAddressSpace() == AddressSpace)
return T;
// If we are composing extended qualifiers together, merge together into one
// ExtQualType node.
unsigned CVRQuals = T.getCVRQualifiers();
QualType::GCAttrTypes GCAttr = QualType::GCNone;
Type *TypeNode = T.getTypePtr();
if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) {
// If this type already has an address space specified, it cannot get
// another one.
assert(EQT->getAddressSpace() == 0 &&
"Type cannot be in multiple addr spaces!");
GCAttr = EQT->getObjCGCAttr();
TypeNode = EQT->getBaseType();
}
// Check if we've already instantiated this type.
llvm::FoldingSetNodeID ID;
ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr);
void *InsertPos = 0;
if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(EXTQy, CVRQuals);
// If the base type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
QualType Canonical;
if (!TypeNode->isCanonical()) {
Canonical = getAddrSpaceQualType(CanT, AddressSpace);
// Update InsertPos, the previous call could have invalidated it.
ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
ExtQualType *New =
new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr);
ExtQualTypes.InsertNode(New, InsertPos);
Types.push_back(New);
return QualType(New, CVRQuals);
}
QualType ASTContext::getObjCGCQualType(QualType T,
QualType::GCAttrTypes GCAttr) {
QualType CanT = getCanonicalType(T);
if (CanT.getObjCGCAttr() == GCAttr)
return T;
// If we are composing extended qualifiers together, merge together into one
// ExtQualType node.
unsigned CVRQuals = T.getCVRQualifiers();
Type *TypeNode = T.getTypePtr();
unsigned AddressSpace = 0;
if (ExtQualType *EQT = dyn_cast<ExtQualType>(TypeNode)) {
// If this type already has an address space specified, it cannot get
// another one.
assert(EQT->getObjCGCAttr() == QualType::GCNone &&
"Type cannot be in multiple addr spaces!");
AddressSpace = EQT->getAddressSpace();
TypeNode = EQT->getBaseType();
}
// Check if we've already instantiated an gc qual'd type of this type.
llvm::FoldingSetNodeID ID;
ExtQualType::Profile(ID, TypeNode, AddressSpace, GCAttr);
void *InsertPos = 0;
if (ExtQualType *EXTQy = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(EXTQy, CVRQuals);
// If the base type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
// FIXME: Isn't this also not canonical if the base type is a array
// or pointer type? I can't find any documentation for objc_gc, though...
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getObjCGCQualType(CanT, GCAttr);
// Update InsertPos, the previous call could have invalidated it.
ExtQualType *NewIP = ExtQualTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
ExtQualType *New =
new (*this, 8) ExtQualType(TypeNode, Canonical, AddressSpace, GCAttr);
ExtQualTypes.InsertNode(New, InsertPos);
Types.push_back(New);
return QualType(New, CVRQuals);
}
/// getComplexType - Return the uniqued reference to the type for a complex
/// number with the specified element type.
QualType ASTContext::getComplexType(QualType T) {
// Unique pointers, to guarantee there is only one pointer of a particular
// structure.
llvm::FoldingSetNodeID ID;
ComplexType::Profile(ID, T);
void *InsertPos = 0;
if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(CT, 0);
// If the pointee type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getComplexType(getCanonicalType(T));
// Get the new insert position for the node we care about.
ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
ComplexType *New = new (*this,8) ComplexType(T, Canonical);
Types.push_back(New);
ComplexTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) {
llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ?
SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes;
FixedWidthIntType *&Entry = Map[Width];
if (!Entry)
Entry = new FixedWidthIntType(Width, Signed);
return QualType(Entry, 0);
}
/// getPointerType - Return the uniqued reference to the type for a pointer to
/// the specified type.
QualType ASTContext::getPointerType(QualType T) {
// Unique pointers, to guarantee there is only one pointer of a particular
// structure.
llvm::FoldingSetNodeID ID;
PointerType::Profile(ID, T);
void *InsertPos = 0;
if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(PT, 0);
// If the pointee type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getPointerType(getCanonicalType(T));
// Get the new insert position for the node we care about.
PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
PointerType *New = new (*this,8) PointerType(T, Canonical);
Types.push_back(New);
PointerTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
/// getBlockPointerType - Return the uniqued reference to the type for
/// a pointer to the specified block.
QualType ASTContext::getBlockPointerType(QualType T) {
assert(T->isFunctionType() && "block of function types only");
// Unique pointers, to guarantee there is only one block of a particular
// structure.
llvm::FoldingSetNodeID ID;
BlockPointerType::Profile(ID, T);
void *InsertPos = 0;
if (BlockPointerType *PT =
BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(PT, 0);
// If the block pointee type isn't canonical, this won't be a canonical
// type either so fill in the canonical type field.
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getBlockPointerType(getCanonicalType(T));
// Get the new insert position for the node we care about.
BlockPointerType *NewIP =
BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
BlockPointerType *New = new (*this,8) BlockPointerType(T, Canonical);
Types.push_back(New);
BlockPointerTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
/// getLValueReferenceType - Return the uniqued reference to the type for an
/// lvalue reference to the specified type.
QualType ASTContext::getLValueReferenceType(QualType T) {
// Unique pointers, to guarantee there is only one pointer of a particular
// structure.
llvm::FoldingSetNodeID ID;
ReferenceType::Profile(ID, T);
void *InsertPos = 0;
if (LValueReferenceType *RT =
LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(RT, 0);
// If the referencee type isn't canonical, this won't be a canonical type
// either, so fill in the canonical type field.
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getLValueReferenceType(getCanonicalType(T));
// Get the new insert position for the node we care about.
LValueReferenceType *NewIP =
LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
LValueReferenceType *New = new (*this,8) LValueReferenceType(T, Canonical);
Types.push_back(New);
LValueReferenceTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
/// getRValueReferenceType - Return the uniqued reference to the type for an
/// rvalue reference to the specified type.
QualType ASTContext::getRValueReferenceType(QualType T) {
// Unique pointers, to guarantee there is only one pointer of a particular
// structure.
llvm::FoldingSetNodeID ID;
ReferenceType::Profile(ID, T);
void *InsertPos = 0;
if (RValueReferenceType *RT =
RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(RT, 0);
// If the referencee type isn't canonical, this won't be a canonical type
// either, so fill in the canonical type field.
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getRValueReferenceType(getCanonicalType(T));
// Get the new insert position for the node we care about.
RValueReferenceType *NewIP =
RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
RValueReferenceType *New = new (*this,8) RValueReferenceType(T, Canonical);
Types.push_back(New);
RValueReferenceTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
/// getMemberPointerType - Return the uniqued reference to the type for a
/// member pointer to the specified type, in the specified class.
QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls)
{
// Unique pointers, to guarantee there is only one pointer of a particular
// structure.
llvm::FoldingSetNodeID ID;
MemberPointerType::Profile(ID, T, Cls);
void *InsertPos = 0;
if (MemberPointerType *PT =
MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(PT, 0);
// If the pointee or class type isn't canonical, this won't be a canonical
// type either, so fill in the canonical type field.
QualType Canonical;
if (!T->isCanonical()) {
Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls));
// Get the new insert position for the node we care about.
MemberPointerType *NewIP =
MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
MemberPointerType *New = new (*this,8) MemberPointerType(T, Cls, Canonical);
Types.push_back(New);
MemberPointerTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
/// getConstantArrayType - Return the unique reference to the type for an
/// array of the specified element type.
QualType ASTContext::getConstantArrayType(QualType EltTy,
const llvm::APInt &ArySize,
ArrayType::ArraySizeModifier ASM,
unsigned EltTypeQuals) {
llvm::FoldingSetNodeID ID;
ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals);
void *InsertPos = 0;
if (ConstantArrayType *ATP =
ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(ATP, 0);
// If the element type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
QualType Canonical;
if (!EltTy->isCanonical()) {
Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize,
ASM, EltTypeQuals);
// Get the new insert position for the node we care about.
ConstantArrayType *NewIP =
ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
ConstantArrayType *New =
new(*this,8)ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals);
ConstantArrayTypes.InsertNode(New, InsertPos);
Types.push_back(New);
return QualType(New, 0);
}
/// getVariableArrayType - Returns a non-unique reference to the type for a
/// variable array of the specified element type.
QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts,
ArrayType::ArraySizeModifier ASM,
unsigned EltTypeQuals) {
// Since we don't unique expressions, it isn't possible to unique VLA's
// that have an expression provided for their size.
VariableArrayType *New =
new(*this,8)VariableArrayType(EltTy,QualType(), NumElts, ASM, EltTypeQuals);
VariableArrayTypes.push_back(New);
Types.push_back(New);
return QualType(New, 0);
}
/// getDependentSizedArrayType - Returns a non-unique reference to
/// the type for a dependently-sized array of the specified element
/// type. FIXME: We will need these to be uniqued, or at least
/// comparable, at some point.
QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts,
ArrayType::ArraySizeModifier ASM,
unsigned EltTypeQuals) {
assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) &&
"Size must be type- or value-dependent!");
// Since we don't unique expressions, it isn't possible to unique
// dependently-sized array types.
DependentSizedArrayType *New =
new (*this,8) DependentSizedArrayType(EltTy, QualType(), NumElts,
ASM, EltTypeQuals);
DependentSizedArrayTypes.push_back(New);
Types.push_back(New);
return QualType(New, 0);
}
QualType ASTContext::getIncompleteArrayType(QualType EltTy,
ArrayType::ArraySizeModifier ASM,
unsigned EltTypeQuals) {
llvm::FoldingSetNodeID ID;
IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals);
void *InsertPos = 0;
if (IncompleteArrayType *ATP =
IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(ATP, 0);
// If the element type isn't canonical, this won't be a canonical type
// either, so fill in the canonical type field.
QualType Canonical;
if (!EltTy->isCanonical()) {
Canonical = getIncompleteArrayType(getCanonicalType(EltTy),
ASM, EltTypeQuals);
// Get the new insert position for the node we care about.
IncompleteArrayType *NewIP =
IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
IncompleteArrayType *New = new (*this,8) IncompleteArrayType(EltTy, Canonical,
ASM, EltTypeQuals);
IncompleteArrayTypes.InsertNode(New, InsertPos);
Types.push_back(New);
return QualType(New, 0);
}
/// getVectorType - Return the unique reference to a vector type of
/// the specified element type and size. VectorType must be a built-in type.
QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) {
BuiltinType *baseType;
baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr());
assert(baseType != 0 && "getVectorType(): Expecting a built-in type");
// Check if we've already instantiated a vector of this type.
llvm::FoldingSetNodeID ID;
VectorType::Profile(ID, vecType, NumElts, Type::Vector);
void *InsertPos = 0;
if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(VTP, 0);
// If the element type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
QualType Canonical;
if (!vecType->isCanonical()) {
Canonical = getVectorType(getCanonicalType(vecType), NumElts);
// Get the new insert position for the node we care about.
VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
VectorType *New = new (*this,8) VectorType(vecType, NumElts, Canonical);
VectorTypes.InsertNode(New, InsertPos);
Types.push_back(New);
return QualType(New, 0);
}
/// getExtVectorType - Return the unique reference to an extended vector type of
/// the specified element type and size. VectorType must be a built-in type.
QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) {
BuiltinType *baseType;
baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr());
assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type");
// Check if we've already instantiated a vector of this type.
llvm::FoldingSetNodeID ID;
VectorType::Profile(ID, vecType, NumElts, Type::ExtVector);
void *InsertPos = 0;
if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(VTP, 0);
// If the element type isn't canonical, this won't be a canonical type either,
// so fill in the canonical type field.
QualType Canonical;
if (!vecType->isCanonical()) {
Canonical = getExtVectorType(getCanonicalType(vecType), NumElts);
// Get the new insert position for the node we care about.
VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
ExtVectorType *New = new (*this,8) ExtVectorType(vecType, NumElts, Canonical);
VectorTypes.InsertNode(New, InsertPos);
Types.push_back(New);
return QualType(New, 0);
}
/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'.
///
QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) {
// Unique functions, to guarantee there is only one function of a particular
// structure.
llvm::FoldingSetNodeID ID;
FunctionNoProtoType::Profile(ID, ResultTy);
void *InsertPos = 0;
if (FunctionNoProtoType *FT =
FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(FT, 0);
QualType Canonical;
if (!ResultTy->isCanonical()) {
Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy));
// Get the new insert position for the node we care about.
FunctionNoProtoType *NewIP =
FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
FunctionNoProtoType *New =new(*this,8)FunctionNoProtoType(ResultTy,Canonical);
Types.push_back(New);
FunctionNoProtoTypes.InsertNode(New, InsertPos);
return QualType(New, 0);
}
/// getFunctionType - Return a normal function type with a typed argument
/// list. isVariadic indicates whether the argument list includes '...'.
QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray,
unsigned NumArgs, bool isVariadic,
unsigned TypeQuals) {
// Unique functions, to guarantee there is only one function of a particular
// structure.
llvm::FoldingSetNodeID ID;
FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic,
TypeQuals);
void *InsertPos = 0;
if (FunctionProtoType *FTP =
FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(FTP, 0);
// Determine whether the type being created is already canonical or not.
bool isCanonical = ResultTy->isCanonical();
for (unsigned i = 0; i != NumArgs && isCanonical; ++i)
if (!ArgArray[i]->isCanonical())
isCanonical = false;
// If this type isn't canonical, get the canonical version of it.
QualType Canonical;
if (!isCanonical) {
llvm::SmallVector<QualType, 16> CanonicalArgs;
CanonicalArgs.reserve(NumArgs);
for (unsigned i = 0; i != NumArgs; ++i)
CanonicalArgs.push_back(getCanonicalType(ArgArray[i]));
Canonical = getFunctionType(getCanonicalType(ResultTy),
&CanonicalArgs[0], NumArgs,
isVariadic, TypeQuals);
// Get the new insert position for the node we care about.
FunctionProtoType *NewIP =
FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos);
assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
}
// FunctionProtoType objects are allocated with extra bytes after them
// for a variable size array (for parameter types) at the end of them.
FunctionProtoType *FTP =
(FunctionProtoType*)Allocate(sizeof(FunctionProtoType) +
NumArgs*sizeof(QualType), 8);
new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic,
TypeQuals, Canonical);
Types.push_back(FTP);
FunctionProtoTypes.InsertNode(FTP, InsertPos);
return QualType(FTP, 0);
}
/// getTypeDeclType - Return the unique reference to the type for the
/// specified type declaration.
QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) {
assert(Decl && "Passed null for Decl param");
if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0);
if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl))
return getTypedefType(Typedef);
else if (isa<TemplateTypeParmDecl>(Decl)) {
assert(false && "Template type parameter types are always available.");
} else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl))
return getObjCInterfaceType(ObjCInterface);
if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) {
if (PrevDecl)
Decl->TypeForDecl = PrevDecl->TypeForDecl;
else
Decl->TypeForDecl = new (*this,8) RecordType(Record);
}
else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) {
if (PrevDecl)
Decl->TypeForDecl = PrevDecl->TypeForDecl;
else
Decl->TypeForDecl = new (*this,8) EnumType(Enum);
}
else
assert(false && "TypeDecl without a type?");
if (!PrevDecl) Types.push_back(Decl->TypeForDecl);
return QualType(Decl->TypeForDecl, 0);
}
/// getTypedefType - Return the unique reference to the type for the
/// specified typename decl.
QualType ASTContext::getTypedefType(TypedefDecl *Decl) {
if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0);
QualType Canonical = getCanonicalType(Decl->getUnderlyingType());
Decl->TypeForDecl = new(*this,8) TypedefType(Type::Typedef, Decl, Canonical);
Types.push_back(Decl->TypeForDecl);
return QualType(Decl->TypeForDecl, 0);
}
/// getObjCInterfaceType - Return the unique reference to the type for the
/// specified ObjC interface decl.
QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl) {
if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0);
ObjCInterfaceDecl *OID = const_cast<ObjCInterfaceDecl*>(Decl);
Decl->TypeForDecl = new(*this,8) ObjCInterfaceType(Type::ObjCInterface, OID);
Types.push_back(Decl->TypeForDecl);
return QualType(Decl->TypeForDecl, 0);
}
/// \brief Retrieve the template type parameter type for a template
/// parameter with the given depth, index, and (optionally) name.
QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index,
IdentifierInfo *Name) {
llvm::FoldingSetNodeID ID;
TemplateTypeParmType::Profile(ID, Depth, Index, Name);
void *InsertPos = 0;
TemplateTypeParmType *TypeParm
= TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos);
if (TypeParm)
return QualType(TypeParm, 0);
if (Name)
TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index, Name,
getTemplateTypeParmType(Depth, Index));
else
TypeParm = new (*this, 8) TemplateTypeParmType(Depth, Index);
Types.push_back(TypeParm);
TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos);
return QualType(TypeParm, 0);
}
QualType
ASTContext::getTemplateSpecializationType(TemplateName Template,
const TemplateArgument *Args,
unsigned NumArgs,
QualType Canon) {
if (!Canon.isNull())
Canon = getCanonicalType(Canon);
llvm::FoldingSetNodeID ID;
TemplateSpecializationType::Profile(ID, Template, Args, NumArgs);
void *InsertPos = 0;
TemplateSpecializationType *Spec
= TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos);
if (Spec)
return QualType(Spec, 0);
void *Mem = Allocate((sizeof(TemplateSpecializationType) +
sizeof(TemplateArgument) * NumArgs),
8);
Spec = new (Mem) TemplateSpecializationType(Template, Args, NumArgs, Canon);
Types.push_back(Spec);
TemplateSpecializationTypes.InsertNode(Spec, InsertPos);
return QualType(Spec, 0);
}
QualType
ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS,
QualType NamedType) {
llvm::FoldingSetNodeID ID;
QualifiedNameType::Profile(ID, NNS, NamedType);
void *InsertPos = 0;
QualifiedNameType *T
= QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos);
if (T)
return QualType(T, 0);
T = new (*this) QualifiedNameType(NNS, NamedType,
getCanonicalType(NamedType));
Types.push_back(T);
QualifiedNameTypes.InsertNode(T, InsertPos);
return QualType(T, 0);
}
QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS,
const IdentifierInfo *Name,
QualType Canon) {
assert(NNS->isDependent() && "nested-name-specifier must be dependent");
if (Canon.isNull()) {
NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
if (CanonNNS != NNS)
Canon = getTypenameType(CanonNNS, Name);
}
llvm::FoldingSetNodeID ID;
TypenameType::Profile(ID, NNS, Name);
void *InsertPos = 0;
TypenameType *T
= TypenameTypes.FindNodeOrInsertPos(ID, InsertPos);
if (T)
return QualType(T, 0);
T = new (*this) TypenameType(NNS, Name, Canon);
Types.push_back(T);
TypenameTypes.InsertNode(T, InsertPos);
return QualType(T, 0);
}
QualType
ASTContext::getTypenameType(NestedNameSpecifier *NNS,
const TemplateSpecializationType *TemplateId,
QualType Canon) {
assert(NNS->isDependent() && "nested-name-specifier must be dependent");
if (Canon.isNull()) {
NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
QualType CanonType = getCanonicalType(QualType(TemplateId, 0));
if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) {
const TemplateSpecializationType *CanonTemplateId
= CanonType->getAsTemplateSpecializationType();
assert(CanonTemplateId &&
"Canonical type must also be a template specialization type");
Canon = getTypenameType(CanonNNS, CanonTemplateId);
}
}
llvm::FoldingSetNodeID ID;
TypenameType::Profile(ID, NNS, TemplateId);
void *InsertPos = 0;
TypenameType *T
= TypenameTypes.FindNodeOrInsertPos(ID, InsertPos);
if (T)
return QualType(T, 0);
T = new (*this) TypenameType(NNS, TemplateId, Canon);
Types.push_back(T);
TypenameTypes.InsertNode(T, InsertPos);
return QualType(T, 0);
}
/// CmpProtocolNames - Comparison predicate for sorting protocols
/// alphabetically.
static bool CmpProtocolNames(const ObjCProtocolDecl *LHS,
const ObjCProtocolDecl *RHS) {
return LHS->getDeclName() < RHS->getDeclName();
}
static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols,
unsigned &NumProtocols) {
ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols;
// Sort protocols, keyed by name.
std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames);
// Remove duplicates.
ProtocolsEnd = std::unique(Protocols, ProtocolsEnd);
NumProtocols = ProtocolsEnd-Protocols;
}
/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for
/// the given interface decl and the conforming protocol list.
QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl,
ObjCProtocolDecl **Protocols, unsigned NumProtocols) {
// Sort the protocol list alphabetically to canonicalize it.
SortAndUniqueProtocols(Protocols, NumProtocols);
llvm::FoldingSetNodeID ID;
ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols);
void *InsertPos = 0;
if (ObjCQualifiedInterfaceType *QT =
ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(QT, 0);
// No Match;
ObjCQualifiedInterfaceType *QType =
new (*this,8) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols);
Types.push_back(QType);
ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos);
return QualType(QType, 0);
}
/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl
/// and the conforming protocol list.
QualType ASTContext::getObjCQualifiedIdType(ObjCProtocolDecl **Protocols,
unsigned NumProtocols) {
// Sort the protocol list alphabetically to canonicalize it.
SortAndUniqueProtocols(Protocols, NumProtocols);
llvm::FoldingSetNodeID ID;
ObjCQualifiedIdType::Profile(ID, Protocols, NumProtocols);
void *InsertPos = 0;
if (ObjCQualifiedIdType *QT =
ObjCQualifiedIdTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(QT, 0);
// No Match;
ObjCQualifiedIdType *QType =
new (*this,8) ObjCQualifiedIdType(Protocols, NumProtocols);
Types.push_back(QType);
ObjCQualifiedIdTypes.InsertNode(QType, InsertPos);
return QualType(QType, 0);
}
/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique
/// TypeOfExprType AST's (since expression's are never shared). For example,
/// multiple declarations that refer to "typeof(x)" all contain different
/// DeclRefExpr's. This doesn't effect the type checker, since it operates
/// on canonical type's (which are always unique).
QualType ASTContext::getTypeOfExprType(Expr *tofExpr) {
QualType Canonical = getCanonicalType(tofExpr->getType());
TypeOfExprType *toe = new (*this,8) TypeOfExprType(tofExpr, Canonical);
Types.push_back(toe);
return QualType(toe, 0);
}
/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique
/// TypeOfType AST's. The only motivation to unique these nodes would be
/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be
/// an issue. This doesn't effect the type checker, since it operates
/// on canonical type's (which are always unique).
QualType ASTContext::getTypeOfType(QualType tofType) {
QualType Canonical = getCanonicalType(tofType);
TypeOfType *tot = new (*this,8) TypeOfType(tofType, Canonical);
Types.push_back(tot);
return QualType(tot, 0);
}
/// getTagDeclType - Return the unique reference to the type for the
/// specified TagDecl (struct/union/class/enum) decl.
QualType ASTContext::getTagDeclType(TagDecl *Decl) {
assert (Decl);
return getTypeDeclType(Decl);
}
/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result
/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and
/// needs to agree with the definition in <stddef.h>.
QualType ASTContext::getSizeType() const {
return getFromTargetType(Target.getSizeType());
}
/// getSignedWCharType - Return the type of "signed wchar_t".
/// Used when in C++, as a GCC extension.
QualType ASTContext::getSignedWCharType() const {
// FIXME: derive from "Target" ?
return WCharTy;
}
/// getUnsignedWCharType - Return the type of "unsigned wchar_t".
/// Used when in C++, as a GCC extension.
QualType ASTContext::getUnsignedWCharType() const {
// FIXME: derive from "Target" ?
return UnsignedIntTy;
}
/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?)
/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9).
QualType ASTContext::getPointerDiffType() const {
return getFromTargetType(Target.getPtrDiffType(0));
}
//===----------------------------------------------------------------------===//
// Type Operators
//===----------------------------------------------------------------------===//
/// getCanonicalType - Return the canonical (structural) type corresponding to
/// the specified potentially non-canonical type. The non-canonical version
/// of a type may have many "decorated" versions of types. Decorators can
/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed
/// to be free of any of these, allowing two canonical types to be compared
/// for exact equality with a simple pointer comparison.
QualType ASTContext::getCanonicalType(QualType T) {
QualType CanType = T.getTypePtr()->getCanonicalTypeInternal();
// If the result has type qualifiers, make sure to canonicalize them as well.
unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers();
if (TypeQuals == 0) return CanType;
// If the type qualifiers are on an array type, get the canonical type of the
// array with the qualifiers applied to the element type.
ArrayType *AT = dyn_cast<ArrayType>(CanType);
if (!AT)
return CanType.getQualifiedType(TypeQuals);
// Get the canonical version of the element with the extra qualifiers on it.
// This can recursively sink qualifiers through multiple levels of arrays.
QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals);
NewEltTy = getCanonicalType(NewEltTy);
if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT))
return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(),
CAT->getIndexTypeQualifier());
if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT))
return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(),
IAT->getIndexTypeQualifier());
if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT))
return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(),
DSAT->getSizeModifier(),
DSAT->getIndexTypeQualifier());
VariableArrayType *VAT = cast<VariableArrayType>(AT);
return getVariableArrayType(NewEltTy, VAT->getSizeExpr(),
VAT->getSizeModifier(),
VAT->getIndexTypeQualifier());
}
TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) {
// If this template name refers to a template, the canonical
// template name merely stores the template itself.
if (TemplateDecl *Template = Name.getAsTemplateDecl())
return TemplateName(Template);
DependentTemplateName *DTN = Name.getAsDependentTemplateName();
assert(DTN && "Non-dependent template names must refer to template decls.");
return DTN->CanonicalTemplateName;
}
NestedNameSpecifier *
ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) {
if (!NNS)
return 0;
switch (NNS->getKind()) {
case NestedNameSpecifier::Identifier:
// Canonicalize the prefix but keep the identifier the same.
return NestedNameSpecifier::Create(*this,
getCanonicalNestedNameSpecifier(NNS->getPrefix()),
NNS->getAsIdentifier());
case NestedNameSpecifier::Namespace:
// A namespace is canonical; build a nested-name-specifier with
// this namespace and no prefix.
return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace());
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate: {
QualType T = getCanonicalType(QualType(NNS->getAsType(), 0));
NestedNameSpecifier *Prefix = 0;
// FIXME: This isn't the right check!
if (T->isDependentType())
Prefix = getCanonicalNestedNameSpecifier(NNS->getPrefix());
return NestedNameSpecifier::Create(*this, Prefix,
NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate,
T.getTypePtr());
}
case NestedNameSpecifier::Global:
// The global specifier is canonical and unique.
return NNS;
}
// Required to silence a GCC warning
return 0;
}
const ArrayType *ASTContext::getAsArrayType(QualType T) {
// Handle the non-qualified case efficiently.
if (T.getCVRQualifiers() == 0) {
// Handle the common positive case fast.
if (const ArrayType *AT = dyn_cast<ArrayType>(T))
return AT;
}
// Handle the common negative case fast, ignoring CVR qualifiers.
QualType CType = T->getCanonicalTypeInternal();
// Make sure to look through type qualifiers (like ExtQuals) for the negative
// test.
if (!isa<ArrayType>(CType) &&
!isa<ArrayType>(CType.getUnqualifiedType()))
return 0;
// Apply any CVR qualifiers from the array type to the element type. This
// implements C99 6.7.3p8: "If the specification of an array type includes
// any type qualifiers, the element type is so qualified, not the array type."
// If we get here, we either have type qualifiers on the type, or we have
// sugar such as a typedef in the way. If we have type qualifiers on the type
// we must propagate them down into the elemeng type.
unsigned CVRQuals = T.getCVRQualifiers();
unsigned AddrSpace = 0;
Type *Ty = T.getTypePtr();
// Rip through ExtQualType's and typedefs to get to a concrete type.
while (1) {
if (const ExtQualType *EXTQT = dyn_cast<ExtQualType>(Ty)) {
AddrSpace = EXTQT->getAddressSpace();
Ty = EXTQT->getBaseType();
} else {
T = Ty->getDesugaredType();
if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0)
break;
CVRQuals |= T.getCVRQualifiers();
Ty = T.getTypePtr();
}
}
// If we have a simple case, just return now.
const ArrayType *ATy = dyn_cast<ArrayType>(Ty);
if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0))
return ATy;
// Otherwise, we have an array and we have qualifiers on it. Push the
// qualifiers into the array element type and return a new array type.
// Get the canonical version of the element with the extra qualifiers on it.
// This can recursively sink qualifiers through multiple levels of arrays.
QualType NewEltTy = ATy->getElementType();
if (AddrSpace)
NewEltTy = getAddrSpaceQualType(NewEltTy, AddrSpace);
NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals);
if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy))
return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(),
CAT->getSizeModifier(),
CAT->getIndexTypeQualifier()));
if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy))
return cast<ArrayType>(getIncompleteArrayType(NewEltTy,
IAT->getSizeModifier(),
IAT->getIndexTypeQualifier()));
if (const DependentSizedArrayType *DSAT
= dyn_cast<DependentSizedArrayType>(ATy))
return cast<ArrayType>(
getDependentSizedArrayType(NewEltTy,
DSAT->getSizeExpr(),
DSAT->getSizeModifier(),
DSAT->getIndexTypeQualifier()));
const VariableArrayType *VAT = cast<VariableArrayType>(ATy);
return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(),
VAT->getSizeModifier(),
VAT->getIndexTypeQualifier()));
}
/// getArrayDecayedType - Return the properly qualified result of decaying the
/// specified array type to a pointer. This operation is non-trivial when
/// handling typedefs etc. The canonical type of "T" must be an array type,
/// this returns a pointer to a properly qualified element of the array.
///
/// See C99 6.7.5.3p7 and C99 6.3.2.1p3.
QualType ASTContext::getArrayDecayedType(QualType Ty) {
// Get the element type with 'getAsArrayType' so that we don't lose any
// typedefs in the element type of the array. This also handles propagation
// of type qualifiers from the array type into the element type if present
// (C99 6.7.3p8).
const ArrayType *PrettyArrayType = getAsArrayType(Ty);
assert(PrettyArrayType && "Not an array type!");
QualType PtrTy = getPointerType(PrettyArrayType->getElementType());
// int x[restrict 4] -> int *restrict
return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier());
}
QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) {
QualType ElemTy = VAT->getElementType();
if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy))
return getBaseElementType(VAT);
return ElemTy;
}
/// getFloatingRank - Return a relative rank for floating point types.
/// This routine will assert if passed a built-in type that isn't a float.
static FloatingRank getFloatingRank(QualType T) {
if (const ComplexType *CT = T->getAsComplexType())
return getFloatingRank(CT->getElementType());
assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type");
switch (T->getAsBuiltinType()->getKind()) {
default: assert(0 && "getFloatingRank(): not a floating type");
case BuiltinType::Float: return FloatRank;
case BuiltinType::Double: return DoubleRank;
case BuiltinType::LongDouble: return LongDoubleRank;
}
}
/// getFloatingTypeOfSizeWithinDomain - Returns a real floating
/// point or a complex type (based on typeDomain/typeSize).
/// 'typeDomain' is a real floating point or complex type.
/// 'typeSize' is a real floating point or complex type.
QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size,
QualType Domain) const {
FloatingRank EltRank = getFloatingRank(Size);
if (Domain->isComplexType()) {
switch (EltRank) {
default: assert(0 && "getFloatingRank(): illegal value for rank");
case FloatRank: return FloatComplexTy;
case DoubleRank: return DoubleComplexTy;
case LongDoubleRank: return LongDoubleComplexTy;
}
}
assert(Domain->isRealFloatingType() && "Unknown domain!");
switch (EltRank) {
default: assert(0 && "getFloatingRank(): illegal value for rank");
case FloatRank: return FloatTy;
case DoubleRank: return DoubleTy;
case LongDoubleRank: return LongDoubleTy;
}
}
/// getFloatingTypeOrder - Compare the rank of the two specified floating
/// point types, ignoring the domain of the type (i.e. 'double' ==
/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If
/// LHS < RHS, return -1.
int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) {
FloatingRank LHSR = getFloatingRank(LHS);
FloatingRank RHSR = getFloatingRank(RHS);
if (LHSR == RHSR)
return 0;
if (LHSR > RHSR)
return 1;
return -1;
}
/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This
/// routine will assert if passed a built-in type that isn't an integer or enum,
/// or if it is not canonicalized.
unsigned ASTContext::getIntegerRank(Type *T) {
assert(T->isCanonical() && "T should be canonicalized");
if (EnumType* ET = dyn_cast<EnumType>(T))
T = ET->getDecl()->getIntegerType().getTypePtr();
// There are two things which impact the integer rank: the width, and
// the ordering of builtins. The builtin ordering is encoded in the
// bottom three bits; the width is encoded in the bits above that.
if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) {
return FWIT->getWidth() << 3;
}
switch (cast<BuiltinType>(T)->getKind()) {
default: assert(0 && "getIntegerRank(): not a built-in integer");
case BuiltinType::Bool:
return 1 + (getIntWidth(BoolTy) << 3);
case BuiltinType::Char_S:
case BuiltinType::Char_U:
case BuiltinType::SChar:
case BuiltinType::UChar:
return 2 + (getIntWidth(CharTy) << 3);
case BuiltinType::Short:
case BuiltinType::UShort:
return 3 + (getIntWidth(ShortTy) << 3);
case BuiltinType::Int:
case BuiltinType::UInt:
return 4 + (getIntWidth(IntTy) << 3);
case BuiltinType::Long:
case BuiltinType::ULong:
return 5 + (getIntWidth(LongTy) << 3);
case BuiltinType::LongLong:
case BuiltinType::ULongLong:
return 6 + (getIntWidth(LongLongTy) << 3);
case BuiltinType::Int128:
case BuiltinType::UInt128:
return 7 + (getIntWidth(Int128Ty) << 3);
}
}
/// getIntegerTypeOrder - Returns the highest ranked integer type:
/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If
/// LHS < RHS, return -1.
int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) {
Type *LHSC = getCanonicalType(LHS).getTypePtr();
Type *RHSC = getCanonicalType(RHS).getTypePtr();
if (LHSC == RHSC) return 0;
bool LHSUnsigned = LHSC->isUnsignedIntegerType();
bool RHSUnsigned = RHSC->isUnsignedIntegerType();
unsigned LHSRank = getIntegerRank(LHSC);
unsigned RHSRank = getIntegerRank(RHSC);
if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned.
if (LHSRank == RHSRank) return 0;
return LHSRank > RHSRank ? 1 : -1;
}
// Otherwise, the LHS is signed and the RHS is unsigned or visa versa.
if (LHSUnsigned) {
// If the unsigned [LHS] type is larger, return it.
if (LHSRank >= RHSRank)
return 1;
// If the signed type can represent all values of the unsigned type, it
// wins. Because we are dealing with 2's complement and types that are
// powers of two larger than each other, this is always safe.
return -1;
}
// If the unsigned [RHS] type is larger, return it.
if (RHSRank >= LHSRank)
return -1;
// If the signed type can represent all values of the unsigned type, it
// wins. Because we are dealing with 2's complement and types that are
// powers of two larger than each other, this is always safe.
return 1;
}
// getCFConstantStringType - Return the type used for constant CFStrings.
QualType ASTContext::getCFConstantStringType() {
if (!CFConstantStringTypeDecl) {
CFConstantStringTypeDecl =
RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(),
&Idents.get("NSConstantString"));
QualType FieldTypes[4];
// const int *isa;
FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const));
// int flags;
FieldTypes[1] = IntTy;
// const char *str;
FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const));
// long length;
FieldTypes[3] = LongTy;
// Create fields
for (unsigned i = 0; i < 4; ++i) {
FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl,
SourceLocation(), 0,
FieldTypes[i], /*BitWidth=*/0,
/*Mutable=*/false);
CFConstantStringTypeDecl->addDecl(*this, Field);
}
CFConstantStringTypeDecl->completeDefinition(*this);
}
return getTagDeclType(CFConstantStringTypeDecl);
}
void ASTContext::setCFConstantStringType(QualType T) {
const RecordType *Rec = T->getAsRecordType();
assert(Rec && "Invalid CFConstantStringType");
CFConstantStringTypeDecl = Rec->getDecl();
}
QualType ASTContext::getObjCFastEnumerationStateType()
{
if (!ObjCFastEnumerationStateTypeDecl) {
ObjCFastEnumerationStateTypeDecl =
RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(),
&Idents.get("__objcFastEnumerationState"));
QualType FieldTypes[] = {
UnsignedLongTy,
getPointerType(ObjCIdType),
getPointerType(UnsignedLongTy),
getConstantArrayType(UnsignedLongTy,
llvm::APInt(32, 5), ArrayType::Normal, 0)
};
for (size_t i = 0; i < 4; ++i) {
FieldDecl *Field = FieldDecl::Create(*this,
ObjCFastEnumerationStateTypeDecl,
SourceLocation(), 0,
FieldTypes[i], /*BitWidth=*/0,
/*Mutable=*/false);
ObjCFastEnumerationStateTypeDecl->addDecl(*this, Field);
}
ObjCFastEnumerationStateTypeDecl->completeDefinition(*this);
}
return getTagDeclType(ObjCFastEnumerationStateTypeDecl);
}
void ASTContext::setObjCFastEnumerationStateType(QualType T) {
const RecordType *Rec = T->getAsRecordType();
assert(Rec && "Invalid ObjCFAstEnumerationStateType");
ObjCFastEnumerationStateTypeDecl = Rec->getDecl();
}
// This returns true if a type has been typedefed to BOOL:
// typedef <type> BOOL;
static bool isTypeTypedefedAsBOOL(QualType T) {
if (const TypedefType *TT = dyn_cast<TypedefType>(T))
if (IdentifierInfo *II = TT->getDecl()->getIdentifier())
return II->isStr("BOOL");
return false;
}
/// getObjCEncodingTypeSize returns size of type for objective-c encoding
/// purpose.
int ASTContext::getObjCEncodingTypeSize(QualType type) {
uint64_t sz = getTypeSize(type);
// Make all integer and enum types at least as large as an int
if (sz > 0 && type->isIntegralType())
sz = std::max(sz, getTypeSize(IntTy));
// Treat arrays as pointers, since that's how they're passed in.
else if (type->isArrayType())
sz = getTypeSize(VoidPtrTy);
return sz / getTypeSize(CharTy);
}
/// getObjCEncodingForMethodDecl - Return the encoded type for this method
/// declaration.
void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl,
std::string& S) {
// FIXME: This is not very efficient.
// Encode type qualifer, 'in', 'inout', etc. for the return type.
getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S);
// Encode result type.
getObjCEncodingForType(Decl->getResultType(), S);
// Compute size of all parameters.
// Start with computing size of a pointer in number of bytes.
// FIXME: There might(should) be a better way of doing this computation!
SourceLocation Loc;
int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy);
// The first two arguments (self and _cmd) are pointers; account for
// their size.
int ParmOffset = 2 * PtrSize;
for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(),
E = Decl->param_end(); PI != E; ++PI) {
QualType PType = (*PI)->getType();
int sz = getObjCEncodingTypeSize(PType);
assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type");
ParmOffset += sz;
}
S += llvm::utostr(ParmOffset);
S += "@0:";
S += llvm::utostr(PtrSize);
// Argument types.
ParmOffset = 2 * PtrSize;
for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(),
E = Decl->param_end(); PI != E; ++PI) {
ParmVarDecl *PVDecl = *PI;
QualType PType = PVDecl->getOriginalType();
if (const ArrayType *AT =
dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) {
// Use array's original type only if it has known number of
// elements.
if (!isa<ConstantArrayType>(AT))
PType = PVDecl->getType();
} else if (PType->isFunctionType())
PType = PVDecl->getType();
// Process argument qualifiers for user supplied arguments; such as,
// 'in', 'inout', etc.
getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S);
getObjCEncodingForType(PType, S);
S += llvm::utostr(ParmOffset);
ParmOffset += getObjCEncodingTypeSize(PType);
}
}
/// getObjCEncodingForPropertyDecl - Return the encoded type for this
/// property declaration. If non-NULL, Container must be either an
/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be
/// NULL when getting encodings for protocol properties.
/// Property attributes are stored as a comma-delimited C string. The simple
/// attributes readonly and bycopy are encoded as single characters. The
/// parametrized attributes, getter=name, setter=name, and ivar=name, are
/// encoded as single characters, followed by an identifier. Property types
/// are also encoded as a parametrized attribute. The characters used to encode
/// these attributes are defined by the following enumeration:
/// @code
/// enum PropertyAttributes {
/// kPropertyReadOnly = 'R', // property is read-only.
/// kPropertyBycopy = 'C', // property is a copy of the value last assigned
/// kPropertyByref = '&', // property is a reference to the value last assigned
/// kPropertyDynamic = 'D', // property is dynamic
/// kPropertyGetter = 'G', // followed by getter selector name
/// kPropertySetter = 'S', // followed by setter selector name
/// kPropertyInstanceVariable = 'V' // followed by instance variable name
/// kPropertyType = 't' // followed by old-style type encoding.
/// kPropertyWeak = 'W' // 'weak' property
/// kPropertyStrong = 'P' // property GC'able
/// kPropertyNonAtomic = 'N' // property non-atomic
/// };
/// @endcode
void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD,
const Decl *Container,
std::string& S) {
// Collect information from the property implementation decl(s).
bool Dynamic = false;
ObjCPropertyImplDecl *SynthesizePID = 0;
// FIXME: Duplicated code due to poor abstraction.
if (Container) {
if (const ObjCCategoryImplDecl *CID =
dyn_cast<ObjCCategoryImplDecl>(Container)) {
for (ObjCCategoryImplDecl::propimpl_iterator
i = CID->propimpl_begin(*this), e = CID->propimpl_end(*this);
i != e; ++i) {
ObjCPropertyImplDecl *PID = *i;
if (PID->getPropertyDecl() == PD) {
if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) {
Dynamic = true;
} else {
SynthesizePID = PID;
}
}
}
} else {
const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container);
for (ObjCCategoryImplDecl::propimpl_iterator
i = OID->propimpl_begin(*this), e = OID->propimpl_end(*this);
i != e; ++i) {
ObjCPropertyImplDecl *PID = *i;
if (PID->getPropertyDecl() == PD) {
if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) {
Dynamic = true;
} else {
SynthesizePID = PID;
}
}
}
}
}
// FIXME: This is not very efficient.
S = "T";
// Encode result type.
// GCC has some special rules regarding encoding of properties which
// closely resembles encoding of ivars.
getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0,
true /* outermost type */,
true /* encoding for property */);
if (PD->isReadOnly()) {
S += ",R";
} else {
switch (PD->getSetterKind()) {
case ObjCPropertyDecl::Assign: break;
case ObjCPropertyDecl::Copy: S += ",C"; break;
case ObjCPropertyDecl::Retain: S += ",&"; break;
}
}
// It really isn't clear at all what this means, since properties
// are "dynamic by default".
if (Dynamic)
S += ",D";
if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic)
S += ",N";
if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
S += ",G";
S += PD->getGetterName().getAsString();
}
if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
S += ",S";
S += PD->getSetterName().getAsString();
}
if (SynthesizePID) {
const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl();
S += ",V";
S += OID->getNameAsString();
}
// FIXME: OBJCGC: weak & strong
}
/// getLegacyIntegralTypeEncoding -
/// Another legacy compatibility encoding: 32-bit longs are encoded as
/// 'l' or 'L' , but not always. For typedefs, we need to use
/// 'i' or 'I' instead if encoding a struct field, or a pointer!
///
void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const {
if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) {
if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) {
if (BT->getKind() == BuiltinType::ULong &&
((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32))
PointeeTy = UnsignedIntTy;
else
if (BT->getKind() == BuiltinType::Long &&
((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32))
PointeeTy = IntTy;
}
}
}
void ASTContext::getObjCEncodingForType(QualType T, std::string& S,
const FieldDecl *Field) {
// We follow the behavior of gcc, expanding structures which are
// directly pointed to, and expanding embedded structures. Note that
// these rules are sufficient to prevent recursive encoding of the
// same type.
getObjCEncodingForTypeImpl(T, S, true, true, Field,
true /* outermost type */);
}
static void EncodeBitField(const ASTContext *Context, std::string& S,
const FieldDecl *FD) {
const Expr *E = FD->getBitWidth();
assert(E && "bitfield width not there - getObjCEncodingForTypeImpl");
ASTContext *Ctx = const_cast<ASTContext*>(Context);
unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue();
S += 'b';
S += llvm::utostr(N);
}
void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S,
bool ExpandPointedToStructures,
bool ExpandStructures,
const FieldDecl *FD,
bool OutermostType,
bool EncodingProperty) {
if (const BuiltinType *BT = T->getAsBuiltinType()) {
if (FD && FD->isBitField()) {
EncodeBitField(this, S, FD);
}
else {
char encoding;
switch (BT->getKind()) {
default: assert(0 && "Unhandled builtin type kind");
case BuiltinType::Void: encoding = 'v'; break;
case BuiltinType::Bool: encoding = 'B'; break;
case BuiltinType::Char_U:
case BuiltinType::UChar: encoding = 'C'; break;
case BuiltinType::UShort: encoding = 'S'; break;
case BuiltinType::UInt: encoding = 'I'; break;
case BuiltinType::ULong:
encoding =
(const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q';
break;
case BuiltinType::UInt128: encoding = 'T'; break;
case BuiltinType::ULongLong: encoding = 'Q'; break;
case BuiltinType::Char_S:
case BuiltinType::SChar: encoding = 'c'; break;
case BuiltinType::Short: encoding = 's'; break;
case BuiltinType::Int: encoding = 'i'; break;
case BuiltinType::Long:
encoding =
(const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q';
break;
case BuiltinType::LongLong: encoding = 'q'; break;
case BuiltinType::Int128: encoding = 't'; break;
case BuiltinType::Float: encoding = 'f'; break;
case BuiltinType::Double: encoding = 'd'; break;
case BuiltinType::LongDouble: encoding = 'd'; break;
}
S += encoding;
}
} else if (const ComplexType *CT = T->getAsComplexType()) {
S += 'j';
getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false,
false);
} else if (T->isObjCQualifiedIdType()) {
getObjCEncodingForTypeImpl(getObjCIdType(), S,
ExpandPointedToStructures,
ExpandStructures, FD);
if (FD || EncodingProperty) {
// Note that we do extended encoding of protocol qualifer list
// Only when doing ivar or property encoding.
const ObjCQualifiedIdType *QIDT = T->getAsObjCQualifiedIdType();
S += '"';
for (unsigned i =0; i < QIDT->getNumProtocols(); i++) {
ObjCProtocolDecl *Proto = QIDT->getProtocols(i);
S += '<';
S += Proto->getNameAsString();
S += '>';
}
S += '"';
}
return;
}
else if (const PointerType *PT = T->getAsPointerType()) {
QualType PointeeTy = PT->getPointeeType();
bool isReadOnly = false;
// For historical/compatibility reasons, the read-only qualifier of the
// pointee gets emitted _before_ the '^'. The read-only qualifier of
// the pointer itself gets ignored, _unless_ we are looking at a typedef!
// Also, do not emit the 'r' for anything but the outermost type!
if (dyn_cast<TypedefType>(T.getTypePtr())) {
if (OutermostType && T.isConstQualified()) {
isReadOnly = true;
S += 'r';
}
}
else if (OutermostType) {
QualType P = PointeeTy;
while (P->getAsPointerType())
P = P->getAsPointerType()->getPointeeType();
if (P.isConstQualified()) {
isReadOnly = true;
S += 'r';
}
}
if (isReadOnly) {
// Another legacy compatibility encoding. Some ObjC qualifier and type
// combinations need to be rearranged.
// Rewrite "in const" from "nr" to "rn"
const char * s = S.c_str();
int len = S.length();
if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') {
std::string replace = "rn";
S.replace(S.end()-2, S.end(), replace);
}
}
if (isObjCIdStructType(PointeeTy)) {
S += '@';
return;
}
else if (PointeeTy->isObjCInterfaceType()) {
if (!EncodingProperty &&
isa<TypedefType>(PointeeTy.getTypePtr())) {
// Another historical/compatibility reason.
// We encode the underlying type which comes out as
// {...};
S += '^';
getObjCEncodingForTypeImpl(PointeeTy, S,
false, ExpandPointedToStructures,
NULL);
return;
}
S += '@';
if (FD || EncodingProperty) {
const ObjCInterfaceType *OIT =
PointeeTy.getUnqualifiedType()->getAsObjCInterfaceType();
ObjCInterfaceDecl *OI = OIT->getDecl();
S += '"';
S += OI->getNameAsCString();
for (unsigned i =0; i < OIT->getNumProtocols(); i++) {
ObjCProtocolDecl *Proto = OIT->getProtocol(i);
S += '<';
S += Proto->getNameAsString();
S += '>';
}
S += '"';
}
return;
} else if (isObjCClassStructType(PointeeTy)) {
S += '#';
return;
} else if (isObjCSelType(PointeeTy)) {
S += ':';
return;
}
if (PointeeTy->isCharType()) {
// char pointer types should be encoded as '*' unless it is a
// type that has been typedef'd to 'BOOL'.
if (!isTypeTypedefedAsBOOL(PointeeTy)) {
S += '*';
return;
}
}
S += '^';
getLegacyIntegralTypeEncoding(PointeeTy);
getObjCEncodingForTypeImpl(PointeeTy, S,
false, ExpandPointedToStructures,
NULL);
} else if (const ArrayType *AT =
// Ignore type qualifiers etc.
dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) {
if (isa<IncompleteArrayType>(AT)) {
// Incomplete arrays are encoded as a pointer to the array element.
S += '^';
getObjCEncodingForTypeImpl(AT->getElementType(), S,
false, ExpandStructures, FD);
} else {
S += '[';
if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT))
S += llvm::utostr(CAT->getSize().getZExtValue());
else {
//Variable length arrays are encoded as a regular array with 0 elements.
assert(isa<VariableArrayType>(AT) && "Unknown array type!");
S += '0';
}
getObjCEncodingForTypeImpl(AT->getElementType(), S,
false, ExpandStructures, FD);
S += ']';
}
} else if (T->getAsFunctionType()) {
S += '?';
} else if (const RecordType *RTy = T->getAsRecordType()) {
RecordDecl *RDecl = RTy->getDecl();
S += RDecl->isUnion() ? '(' : '{';
// Anonymous structures print as '?'
if (const IdentifierInfo *II = RDecl->getIdentifier()) {
S += II->getName();
} else {
S += '?';
}
if (ExpandStructures) {
S += '=';
for (RecordDecl::field_iterator Field = RDecl->field_begin(*this),
FieldEnd = RDecl->field_end(*this);
Field != FieldEnd; ++Field) {
if (FD) {
S += '"';
S += Field->getNameAsString();
S += '"';
}
// Special case bit-fields.
if (Field->isBitField()) {
getObjCEncodingForTypeImpl(Field->getType(), S, false, true,
(*Field));
} else {
QualType qt = Field->getType();
getLegacyIntegralTypeEncoding(qt);
getObjCEncodingForTypeImpl(qt, S, false, true,
FD);
}
}
}
S += RDecl->isUnion() ? ')' : '}';
} else if (T->isEnumeralType()) {
if (FD && FD->isBitField())
EncodeBitField(this, S, FD);
else
S += 'i';
} else if (T->isBlockPointerType()) {
S += "@?"; // Unlike a pointer-to-function, which is "^?".
} else if (T->isObjCInterfaceType()) {
// @encode(class_name)
ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl();
S += '{';
const IdentifierInfo *II = OI->getIdentifier();
S += II->getName();
S += '=';
llvm::SmallVector<FieldDecl*, 32> RecFields;
CollectObjCIvars(OI, RecFields);
for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
if (RecFields[i]->isBitField())
getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true,
RecFields[i]);
else
getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true,
FD);
}
S += '}';
}
else
assert(0 && "@encode for type not implemented!");
}
void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT,
std::string& S) const {
if (QT & Decl::OBJC_TQ_In)
S += 'n';
if (QT & Decl::OBJC_TQ_Inout)
S += 'N';
if (QT & Decl::OBJC_TQ_Out)
S += 'o';
if (QT & Decl::OBJC_TQ_Bycopy)
S += 'O';
if (QT & Decl::OBJC_TQ_Byref)
S += 'R';
if (QT & Decl::OBJC_TQ_Oneway)
S += 'V';
}
void ASTContext::setBuiltinVaListType(QualType T)
{
assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!");
BuiltinVaListType = T;
}
void ASTContext::setObjCIdType(QualType T)
{
ObjCIdType = T;
const TypedefType *TT = T->getAsTypedefType();
if (!TT)
return;
TypedefDecl *TD = TT->getDecl();
// typedef struct objc_object *id;
const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType();
// User error - caller will issue diagnostics.
if (!ptr)
return;
const RecordType *rec = ptr->getPointeeType()->getAsStructureType();
// User error - caller will issue diagnostics.
if (!rec)
return;
IdStructType = rec;
}
void ASTContext::setObjCSelType(QualType T)
{
ObjCSelType = T;
const TypedefType *TT = T->getAsTypedefType();
if (!TT)
return;
TypedefDecl *TD = TT->getDecl();
// typedef struct objc_selector *SEL;
const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType();
if (!ptr)
return;
const RecordType *rec = ptr->getPointeeType()->getAsStructureType();
if (!rec)
return;
SelStructType = rec;
}
void ASTContext::setObjCProtoType(QualType QT)
{
ObjCProtoType = QT;
}
void ASTContext::setObjCClassType(QualType T)
{
ObjCClassType = T;
const TypedefType *TT = T->getAsTypedefType();
if (!TT)
return;
TypedefDecl *TD = TT->getDecl();
// typedef struct objc_class *Class;
const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType();
assert(ptr && "'Class' incorrectly typed");
const RecordType *rec = ptr->getPointeeType()->getAsStructureType();
assert(rec && "'Class' incorrectly typed");
ClassStructType = rec;
}
void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) {
assert(ObjCConstantStringType.isNull() &&
"'NSConstantString' type already set!");
ObjCConstantStringType = getObjCInterfaceType(Decl);
}
/// \brief Retrieve the template name that represents a qualified
/// template name such as \c std::vector.
TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS,
bool TemplateKeyword,
TemplateDecl *Template) {
llvm::FoldingSetNodeID ID;
QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template);
void *InsertPos = 0;
QualifiedTemplateName *QTN =
QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
if (!QTN) {
QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template);
QualifiedTemplateNames.InsertNode(QTN, InsertPos);
}
return TemplateName(QTN);
}
/// \brief Retrieve the template name that represents a dependent
/// template name such as \c MetaFun::template apply.
TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS,
const IdentifierInfo *Name) {
assert(NNS->isDependent() && "Nested name specifier must be dependent");
llvm::FoldingSetNodeID ID;
DependentTemplateName::Profile(ID, NNS, Name);
void *InsertPos = 0;
DependentTemplateName *QTN =
DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos);
if (QTN)
return TemplateName(QTN);
NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS);
if (CanonNNS == NNS) {
QTN = new (*this,4) DependentTemplateName(NNS, Name);
} else {
TemplateName Canon = getDependentTemplateName(CanonNNS, Name);
QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon);
}
DependentTemplateNames.InsertNode(QTN, InsertPos);
return TemplateName(QTN);
}
/// getFromTargetType - Given one of the integer types provided by
/// TargetInfo, produce the corresponding type. The unsigned @p Type
/// is actually a value of type @c TargetInfo::IntType.
QualType ASTContext::getFromTargetType(unsigned Type) const {
switch (Type) {
case TargetInfo::NoInt: return QualType();
case TargetInfo::SignedShort: return ShortTy;
case TargetInfo::UnsignedShort: return UnsignedShortTy;
case TargetInfo::SignedInt: return IntTy;
case TargetInfo::UnsignedInt: return UnsignedIntTy;
case TargetInfo::SignedLong: return LongTy;
case TargetInfo::UnsignedLong: return UnsignedLongTy;
case TargetInfo::SignedLongLong: return LongLongTy;
case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy;
}
assert(false && "Unhandled TargetInfo::IntType value");
return QualType();
}
//===----------------------------------------------------------------------===//
// Type Predicates.
//===----------------------------------------------------------------------===//
/// isObjCNSObjectType - Return true if this is an NSObject object using
/// NSObject attribute on a c-style pointer type.
/// FIXME - Make it work directly on types.
///
bool ASTContext::isObjCNSObjectType(QualType Ty) const {
if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) {
if (TypedefDecl *TD = TDT->getDecl())
if (TD->getAttr<ObjCNSObjectAttr>())
return true;
}
return false;
}
/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer
/// to an object type. This includes "id" and "Class" (two 'special' pointers
/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified
/// ID type).
bool ASTContext::isObjCObjectPointerType(QualType Ty) const {
if (Ty->isObjCQualifiedIdType())
return true;
// Blocks are objects.
if (Ty->isBlockPointerType())
return true;
// All other object types are pointers.
const PointerType *PT = Ty->getAsPointerType();
if (PT == 0)
return false;
// If this a pointer to an interface (e.g. NSString*), it is ok.
if (PT->getPointeeType()->isObjCInterfaceType() ||
// If is has NSObject attribute, OK as well.
isObjCNSObjectType(Ty))
return true;
// Check to see if this is 'id' or 'Class', both of which are typedefs for
// pointer types. This looks for the typedef specifically, not for the
// underlying type. Iteratively strip off typedefs so that we can handle
// typedefs of typedefs.
while (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) {
if (Ty.getUnqualifiedType() == getObjCIdType() ||
Ty.getUnqualifiedType() == getObjCClassType())
return true;
Ty = TDT->getDecl()->getUnderlyingType();
}
return false;
}
/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's
/// garbage collection attribute.
///
QualType::GCAttrTypes ASTContext::getObjCGCAttrKind(const QualType &Ty) const {
QualType::GCAttrTypes GCAttrs = QualType::GCNone;
if (getLangOptions().ObjC1 &&
getLangOptions().getGCMode() != LangOptions::NonGC) {
GCAttrs = Ty.getObjCGCAttr();
// Default behavious under objective-c's gc is for objective-c pointers
// (or pointers to them) be treated as though they were declared
// as __strong.
if (GCAttrs == QualType::GCNone) {
if (isObjCObjectPointerType(Ty))
GCAttrs = QualType::Strong;
else if (Ty->isPointerType())
return getObjCGCAttrKind(Ty->getAsPointerType()->getPointeeType());
}
// Non-pointers have none gc'able attribute regardless of the attribute
// set on them.
else if (!isObjCObjectPointerType(Ty) && !Ty->isPointerType())
return QualType::GCNone;
}
return GCAttrs;
}
//===----------------------------------------------------------------------===//
// Type Compatibility Testing
//===----------------------------------------------------------------------===//
/// typesAreBlockCompatible - This routine is called when comparing two
/// block types. Types must be strictly compatible here. For example,
/// C unfortunately doesn't produce an error for the following:
///
/// int (*emptyArgFunc)();
/// int (*intArgList)(int) = emptyArgFunc;
///
/// For blocks, we will produce an error for the following (similar to C++):
///
/// int (^emptyArgBlock)();
/// int (^intArgBlock)(int) = emptyArgBlock;
///
/// FIXME: When the dust settles on this integration, fold this into mergeTypes.
///
bool ASTContext::typesAreBlockCompatible(QualType lhs, QualType rhs) {
const FunctionType *lbase = lhs->getAsFunctionType();
const FunctionType *rbase = rhs->getAsFunctionType();
const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase);
const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase);
if (lproto && rproto == 0)
return false;
return !mergeTypes(lhs, rhs).isNull();
}
/// areCompatVectorTypes - Return true if the two specified vector types are
/// compatible.
static bool areCompatVectorTypes(const VectorType *LHS,
const VectorType *RHS) {
assert(LHS->isCanonical() && RHS->isCanonical());
return LHS->getElementType() == RHS->getElementType() &&
LHS->getNumElements() == RHS->getNumElements();
}
/// canAssignObjCInterfaces - Return true if the two interface types are
/// compatible for assignment from RHS to LHS. This handles validation of any
/// protocol qualifiers on the LHS or RHS.
///
bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS,
const ObjCInterfaceType *RHS) {
// Verify that the base decls are compatible: the RHS must be a subclass of
// the LHS.
if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl()))
return false;
// RHS must have a superset of the protocols in the LHS. If the LHS is not
// protocol qualified at all, then we are good.
if (!isa<ObjCQualifiedInterfaceType>(LHS))
return true;
// Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it
// isn't a superset.
if (!isa<ObjCQualifiedInterfaceType>(RHS))
return true; // FIXME: should return false!
// Finally, we must have two protocol-qualified interfaces.
const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS);
const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS);
// All LHS protocols must have a presence on the RHS.
assert(LHSP->qual_begin() != LHSP->qual_end() && "Empty LHS protocol list?");
for (ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(),
LHSPE = LHSP->qual_end();
LHSPI != LHSPE; LHSPI++) {
bool RHSImplementsProtocol = false;
// If the RHS doesn't implement the protocol on the left, the types
// are incompatible.
for (ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(),
RHSPE = RHSP->qual_end();
!RHSImplementsProtocol && (RHSPI != RHSPE); RHSPI++) {
if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier()))
RHSImplementsProtocol = true;
}
// FIXME: For better diagnostics, consider passing back the protocol name.
if (!RHSImplementsProtocol)
return false;
}
// The RHS implements all protocols listed on the LHS.
return true;
}
bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) {
// get the "pointed to" types
const PointerType *LHSPT = LHS->getAsPointerType();
const PointerType *RHSPT = RHS->getAsPointerType();
if (!LHSPT || !RHSPT)
return false;
QualType lhptee = LHSPT->getPointeeType();
QualType rhptee = RHSPT->getPointeeType();
const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType();
const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType();
// ID acts sort of like void* for ObjC interfaces
if (LHSIface && isObjCIdStructType(rhptee))
return true;
if (RHSIface && isObjCIdStructType(lhptee))
return true;
if (!LHSIface || !RHSIface)
return false;
return canAssignObjCInterfaces(LHSIface, RHSIface) ||
canAssignObjCInterfaces(RHSIface, LHSIface);
}
/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible,
/// both shall have the identically qualified version of a compatible type.
/// C99 6.2.7p1: Two types have compatible types if their types are the
/// same. See 6.7.[2,3,5] for additional rules.
bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) {
return !mergeTypes(LHS, RHS).isNull();
}
QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) {
const FunctionType *lbase = lhs->getAsFunctionType();
const FunctionType *rbase = rhs->getAsFunctionType();
const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase);
const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase);
bool allLTypes = true;
bool allRTypes = true;
// Check return type
QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType());
if (retType.isNull()) return QualType();
if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType()))
allLTypes = false;
if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType()))
allRTypes = false;
if (lproto && rproto) { // two C99 style function prototypes
unsigned lproto_nargs = lproto->getNumArgs();
unsigned rproto_nargs = rproto->getNumArgs();
// Compatible functions must have the same number of arguments
if (lproto_nargs != rproto_nargs)
return QualType();
// Variadic and non-variadic functions aren't compatible
if (lproto->isVariadic() != rproto->isVariadic())
return QualType();
if (lproto->getTypeQuals() != rproto->getTypeQuals())
return QualType();
// Check argument compatibility
llvm::SmallVector<QualType, 10> types;
for (unsigned i = 0; i < lproto_nargs; i++) {
QualType largtype = lproto->getArgType(i).getUnqualifiedType();
QualType rargtype = rproto->getArgType(i).getUnqualifiedType();
QualType argtype = mergeTypes(largtype, rargtype);
if (argtype.isNull()) return QualType();
types.push_back(argtype);
if (getCanonicalType(argtype) != getCanonicalType(largtype))
allLTypes = false;
if (getCanonicalType(argtype) != getCanonicalType(rargtype))
allRTypes = false;
}
if (allLTypes) return lhs;
if (allRTypes) return rhs;
return getFunctionType(retType, types.begin(), types.size(),
lproto->isVariadic(), lproto->getTypeQuals());
}
if (lproto) allRTypes = false;
if (rproto) allLTypes = false;
const FunctionProtoType *proto = lproto ? lproto : rproto;
if (proto) {
if (proto->isVariadic()) return QualType();
// Check that the types are compatible with the types that
// would result from default argument promotions (C99 6.7.5.3p15).
// The only types actually affected are promotable integer
// types and floats, which would be passed as a different
// type depending on whether the prototype is visible.
unsigned proto_nargs = proto->getNumArgs();
for (unsigned i = 0; i < proto_nargs; ++i) {
QualType argTy = proto->getArgType(i);
if (argTy->isPromotableIntegerType() ||
getCanonicalType(argTy).getUnqualifiedType() == FloatTy)
return QualType();
}
if (allLTypes) return lhs;
if (allRTypes) return rhs;
return getFunctionType(retType, proto->arg_type_begin(),
proto->getNumArgs(), lproto->isVariadic(),
lproto->getTypeQuals());
}
if (allLTypes) return lhs;
if (allRTypes) return rhs;
return getFunctionNoProtoType(retType);
}
QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) {
// C++ [expr]: If an expression initially has the type "reference to T", the
// type is adjusted to "T" prior to any further analysis, the expression
// designates the object or function denoted by the reference, and the
// expression is an lvalue unless the reference is an rvalue reference and
// the expression is a function call (possibly inside parentheses).
// FIXME: C++ shouldn't be going through here! The rules are different
// enough that they should be handled separately.
// FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really*
// shouldn't be going through here!
if (const ReferenceType *RT = LHS->getAsReferenceType())
LHS = RT->getPointeeType();
if (const ReferenceType *RT = RHS->getAsReferenceType())
RHS = RT->getPointeeType();
QualType LHSCan = getCanonicalType(LHS),
RHSCan = getCanonicalType(RHS);
// If two types are identical, they are compatible.
if (LHSCan == RHSCan)
return LHS;
// If the qualifiers are different, the types aren't compatible
// Note that we handle extended qualifiers later, in the
// case for ExtQualType.
if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers())
return QualType();
Type::TypeClass LHSClass = LHSCan.getUnqualifiedType()->getTypeClass();
Type::TypeClass RHSClass = RHSCan.getUnqualifiedType()->getTypeClass();
// We want to consider the two function types to be the same for these
// comparisons, just force one to the other.
if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto;
if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto;
// Same as above for arrays
if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray)
LHSClass = Type::ConstantArray;
if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray)
RHSClass = Type::ConstantArray;
// Canonicalize ExtVector -> Vector.
if (LHSClass == Type::ExtVector) LHSClass = Type::Vector;
if (RHSClass == Type::ExtVector) RHSClass = Type::Vector;
// Consider qualified interfaces and interfaces the same.
if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface;
if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface;
// If the canonical type classes don't match.
if (LHSClass != RHSClass) {
const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType();
const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType();
// 'id' and 'Class' act sort of like void* for ObjC interfaces
if (LHSIface && (isObjCIdStructType(RHS) || isObjCClassStructType(RHS)))
return LHS;
if (RHSIface && (isObjCIdStructType(LHS) || isObjCClassStructType(LHS)))
return RHS;
// ID is compatible with all qualified id types.
if (LHS->isObjCQualifiedIdType()) {
if (const PointerType *PT = RHS->getAsPointerType()) {
QualType pType = PT->getPointeeType();
if (isObjCIdStructType(pType) || isObjCClassStructType(pType))
return LHS;
// FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true).
// Unfortunately, this API is part of Sema (which we don't have access
// to. Need to refactor. The following check is insufficient, since we
// need to make sure the class implements the protocol.
if (pType->isObjCInterfaceType())
return LHS;
}
}
if (RHS->isObjCQualifiedIdType()) {
if (const PointerType *PT = LHS->getAsPointerType()) {
QualType pType = PT->getPointeeType();
if (isObjCIdStructType(pType) || isObjCClassStructType(pType))
return RHS;
// FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true).
// Unfortunately, this API is part of Sema (which we don't have access
// to. Need to refactor. The following check is insufficient, since we
// need to make sure the class implements the protocol.
if (pType->isObjCInterfaceType())
return RHS;
}
}
// C99 6.7.2.2p4: Each enumerated type shall be compatible with char,
// a signed integer type, or an unsigned integer type.
if (const EnumType* ETy = LHS->getAsEnumType()) {
if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType())
return RHS;
}
if (const EnumType* ETy = RHS->getAsEnumType()) {
if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType())
return LHS;
}
return QualType();
}
// The canonical type classes match.
switch (LHSClass) {
#define TYPE(Class, Base)
#define ABSTRACT_TYPE(Class, Base)
#define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
#define DEPENDENT_TYPE(Class, Base) case Type::Class:
#include "clang/AST/TypeNodes.def"
assert(false && "Non-canonical and dependent types shouldn't get here");
return QualType();
case Type::LValueReference:
case Type::RValueReference:
case Type::MemberPointer:
assert(false && "C++ should never be in mergeTypes");
return QualType();
case Type::IncompleteArray:
case Type::VariableArray:
case Type::FunctionProto:
case Type::ExtVector:
case Type::ObjCQualifiedInterface:
assert(false && "Types are eliminated above");
return QualType();
case Type::Pointer:
{
// Merge two pointer types, while trying to preserve typedef info
QualType LHSPointee = LHS->getAsPointerType()->getPointeeType();
QualType RHSPointee = RHS->getAsPointerType()->getPointeeType();
QualType ResultType = mergeTypes(LHSPointee, RHSPointee);
if (ResultType.isNull()) return QualType();
if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType))
return LHS;
if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType))
return RHS;
return getPointerType(ResultType);
}
case Type::BlockPointer:
{
// Merge two block pointer types, while trying to preserve typedef info
QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType();
QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType();
QualType ResultType = mergeTypes(LHSPointee, RHSPointee);
if (ResultType.isNull()) return QualType();
if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType))
return LHS;
if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType))
return RHS;
return getBlockPointerType(ResultType);
}
case Type::ConstantArray:
{
const ConstantArrayType* LCAT = getAsConstantArrayType(LHS);
const ConstantArrayType* RCAT = getAsConstantArrayType(RHS);
if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize())
return QualType();
QualType LHSElem = getAsArrayType(LHS)->getElementType();
QualType RHSElem = getAsArrayType(RHS)->getElementType();
QualType ResultType = mergeTypes(LHSElem, RHSElem);
if (ResultType.isNull()) return QualType();
if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType))
return LHS;
if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType))
return RHS;
if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(),
ArrayType::ArraySizeModifier(), 0);
if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(),
ArrayType::ArraySizeModifier(), 0);
const VariableArrayType* LVAT = getAsVariableArrayType(LHS);
const VariableArrayType* RVAT = getAsVariableArrayType(RHS);
if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType))
return LHS;
if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType))
return RHS;
if (LVAT) {
// FIXME: This isn't correct! But tricky to implement because
// the array's size has to be the size of LHS, but the type
// has to be different.
return LHS;
}
if (RVAT) {
// FIXME: This isn't correct! But tricky to implement because
// the array's size has to be the size of RHS, but the type
// has to be different.
return RHS;
}
if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS;
if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS;
return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0);
}
case Type::FunctionNoProto:
return mergeFunctionTypes(LHS, RHS);
case Type::Record:
case Type::Enum:
// FIXME: Why are these compatible?
if (isObjCIdStructType(LHS) && isObjCClassStructType(RHS)) return LHS;
if (isObjCClassStructType(LHS) && isObjCIdStructType(RHS)) return LHS;
return QualType();
case Type::Builtin:
// Only exactly equal builtin types are compatible, which is tested above.
return QualType();
case Type::Complex:
// Distinct complex types are incompatible.
return QualType();
case Type::Vector:
// FIXME: The merged type should be an ExtVector!
if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType()))
return LHS;
return QualType();
case Type::ObjCInterface: {
// Check if the interfaces are assignment compatible.
// FIXME: This should be type compatibility, e.g. whether
// "LHS x; RHS x;" at global scope is legal.
const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType();
const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType();
if (LHSIface && RHSIface &&
canAssignObjCInterfaces(LHSIface, RHSIface))
return LHS;
return QualType();
}
case Type::ObjCQualifiedId:
// Distinct qualified id's are not compatible.
return QualType();
case Type::FixedWidthInt:
// Distinct fixed-width integers are not compatible.
return QualType();
case Type::ExtQual:
// FIXME: ExtQual types can be compatible even if they're not
// identical!
return QualType();
// First attempt at an implementation, but I'm not really sure it's
// right...
#if 0
ExtQualType* LQual = cast<ExtQualType>(LHSCan);
ExtQualType* RQual = cast<ExtQualType>(RHSCan);
if (LQual->getAddressSpace() != RQual->getAddressSpace() ||
LQual->getObjCGCAttr() != RQual->getObjCGCAttr())
return QualType();
QualType LHSBase, RHSBase, ResultType, ResCanUnqual;
LHSBase = QualType(LQual->getBaseType(), 0);
RHSBase = QualType(RQual->getBaseType(), 0);
ResultType = mergeTypes(LHSBase, RHSBase);
if (ResultType.isNull()) return QualType();
ResCanUnqual = getCanonicalType(ResultType).getUnqualifiedType();
if (LHSCan.getUnqualifiedType() == ResCanUnqual)
return LHS;
if (RHSCan.getUnqualifiedType() == ResCanUnqual)
return RHS;
ResultType = getAddrSpaceQualType(ResultType, LQual->getAddressSpace());
ResultType = getObjCGCQualType(ResultType, LQual->getObjCGCAttr());
ResultType.setCVRQualifiers(LHSCan.getCVRQualifiers());
return ResultType;
#endif
case Type::TemplateSpecialization:
assert(false && "Dependent types have no size");
break;
}
return QualType();
}
//===----------------------------------------------------------------------===//
// Integer Predicates
//===----------------------------------------------------------------------===//
unsigned ASTContext::getIntWidth(QualType T) {
if (T == BoolTy)
return 1;
if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) {
return FWIT->getWidth();
}
// For builtin types, just use the standard type sizing method
return (unsigned)getTypeSize(T);
}
QualType ASTContext::getCorrespondingUnsignedType(QualType T) {
assert(T->isSignedIntegerType() && "Unexpected type");
if (const EnumType* ETy = T->getAsEnumType())
T = ETy->getDecl()->getIntegerType();
const BuiltinType* BTy = T->getAsBuiltinType();
assert (BTy && "Unexpected signed integer type");
switch (BTy->getKind()) {
case BuiltinType::Char_S:
case BuiltinType::SChar:
return UnsignedCharTy;
case BuiltinType::Short:
return UnsignedShortTy;
case BuiltinType::Int:
return UnsignedIntTy;
case BuiltinType::Long:
return UnsignedLongTy;
case BuiltinType::LongLong:
return UnsignedLongLongTy;
case BuiltinType::Int128:
return UnsignedInt128Ty;
default:
assert(0 && "Unexpected signed integer type");
return QualType();
}
}
ExternalASTSource::~ExternalASTSource() { }
void ExternalASTSource::PrintStats() { }
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