forked from OSchip/llvm-project
1625 lines
64 KiB
C++
1625 lines
64 KiB
C++
//===--- CGClass.cpp - Emit LLVM Code for C++ classes ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code dealing with C++ code generation of classes
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenFunction.h"
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#include "clang/AST/CXXInheritance.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/StmtCXX.h"
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using namespace clang;
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using namespace CodeGen;
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static uint64_t
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ComputeNonVirtualBaseClassOffset(ASTContext &Context,
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const CXXBasePath &Path,
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unsigned Start) {
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uint64_t Offset = 0;
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for (unsigned i = Start, e = Path.size(); i != e; ++i) {
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const CXXBasePathElement& Element = Path[i];
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// Get the layout.
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const ASTRecordLayout &Layout = Context.getASTRecordLayout(Element.Class);
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const CXXBaseSpecifier *BS = Element.Base;
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assert(!BS->isVirtual() && "Should not see virtual bases here!");
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const CXXRecordDecl *Base =
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cast<CXXRecordDecl>(BS->getType()->getAs<RecordType>()->getDecl());
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// Add the offset.
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Offset += Layout.getBaseClassOffset(Base) / 8;
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}
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return Offset;
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}
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llvm::Constant *
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CodeGenModule::GetNonVirtualBaseClassOffset(const CXXRecordDecl *Class,
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const CXXRecordDecl *BaseClass) {
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if (Class == BaseClass)
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return 0;
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CXXBasePaths Paths(/*FindAmbiguities=*/false,
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/*RecordPaths=*/true, /*DetectVirtual=*/false);
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if (!const_cast<CXXRecordDecl *>(Class)->
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isDerivedFrom(const_cast<CXXRecordDecl *>(BaseClass), Paths)) {
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assert(false && "Class must be derived from the passed in base class!");
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return 0;
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}
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uint64_t Offset = ComputeNonVirtualBaseClassOffset(getContext(),
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Paths.front(), 0);
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if (!Offset)
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return 0;
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const llvm::Type *PtrDiffTy =
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Types.ConvertType(getContext().getPointerDiffType());
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return llvm::ConstantInt::get(PtrDiffTy, Offset);
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}
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// FIXME: This probably belongs in CGVtable, but it relies on
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// the static function ComputeNonVirtualBaseClassOffset, so we should make that
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// a CodeGenModule member function as well.
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ThunkAdjustment
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CodeGenModule::ComputeThunkAdjustment(const CXXRecordDecl *ClassDecl,
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const CXXRecordDecl *BaseClassDecl) {
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CXXBasePaths Paths(/*FindAmbiguities=*/false,
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/*RecordPaths=*/true, /*DetectVirtual=*/false);
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if (!const_cast<CXXRecordDecl *>(ClassDecl)->
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isDerivedFrom(const_cast<CXXRecordDecl *>(BaseClassDecl), Paths)) {
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assert(false && "Class must be derived from the passed in base class!");
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return ThunkAdjustment();
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}
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unsigned Start = 0;
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uint64_t VirtualOffset = 0;
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const CXXBasePath &Path = Paths.front();
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const CXXRecordDecl *VBase = 0;
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for (unsigned i = 0, e = Path.size(); i != e; ++i) {
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const CXXBasePathElement& Element = Path[i];
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if (Element.Base->isVirtual()) {
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Start = i+1;
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QualType VBaseType = Element.Base->getType();
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VBase = cast<CXXRecordDecl>(VBaseType->getAs<RecordType>()->getDecl());
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}
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}
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if (VBase)
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VirtualOffset =
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getVtableInfo().getVirtualBaseOffsetOffset(ClassDecl, BaseClassDecl);
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uint64_t Offset =
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ComputeNonVirtualBaseClassOffset(getContext(), Paths.front(), Start);
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return ThunkAdjustment(Offset, VirtualOffset);
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}
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/// Gets the address of a virtual base class within a complete object.
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/// This should only be used for (1) non-virtual bases or (2) virtual bases
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/// when the type is known to be complete (e.g. in complete destructors).
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///
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/// The object pointed to by 'This' is assumed to be non-null.
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llvm::Value *
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CodeGenFunction::GetAddressOfBaseOfCompleteClass(llvm::Value *This,
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bool isBaseVirtual,
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const CXXRecordDecl *Derived,
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const CXXRecordDecl *Base) {
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// 'this' must be a pointer (in some address space) to Derived.
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assert(This->getType()->isPointerTy() &&
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cast<llvm::PointerType>(This->getType())->getElementType()
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== ConvertType(Derived));
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// Compute the offset of the virtual base.
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uint64_t Offset;
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const ASTRecordLayout &Layout = getContext().getASTRecordLayout(Derived);
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if (isBaseVirtual)
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Offset = Layout.getVBaseClassOffset(Base);
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else
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Offset = Layout.getBaseClassOffset(Base);
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// Shift and cast down to the base type.
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// TODO: for complete types, this should be possible with a GEP.
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llvm::Value *V = This;
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if (Offset) {
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const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext());
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V = Builder.CreateBitCast(V, Int8PtrTy);
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V = Builder.CreateConstInBoundsGEP1_64(V, Offset / 8);
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}
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V = Builder.CreateBitCast(V, ConvertType(Base)->getPointerTo());
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return V;
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}
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llvm::Value *
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CodeGenFunction::GetAddressOfBaseClass(llvm::Value *Value,
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const CXXRecordDecl *Class,
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const CXXRecordDecl *BaseClass,
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bool NullCheckValue) {
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QualType BTy =
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getContext().getCanonicalType(
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getContext().getTypeDeclType(BaseClass));
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const llvm::Type *BasePtrTy = llvm::PointerType::getUnqual(ConvertType(BTy));
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if (Class == BaseClass) {
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// Just cast back.
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return Builder.CreateBitCast(Value, BasePtrTy);
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}
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CXXBasePaths Paths(/*FindAmbiguities=*/false,
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/*RecordPaths=*/true, /*DetectVirtual=*/false);
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if (!const_cast<CXXRecordDecl *>(Class)->
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isDerivedFrom(const_cast<CXXRecordDecl *>(BaseClass), Paths)) {
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assert(false && "Class must be derived from the passed in base class!");
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return 0;
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}
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unsigned Start = 0;
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llvm::Value *VirtualOffset = 0;
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const CXXBasePath &Path = Paths.front();
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const CXXRecordDecl *VBase = 0;
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for (unsigned i = 0, e = Path.size(); i != e; ++i) {
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const CXXBasePathElement& Element = Path[i];
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if (Element.Base->isVirtual()) {
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Start = i+1;
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QualType VBaseType = Element.Base->getType();
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VBase = cast<CXXRecordDecl>(VBaseType->getAs<RecordType>()->getDecl());
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}
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}
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uint64_t Offset =
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ComputeNonVirtualBaseClassOffset(getContext(), Paths.front(), Start);
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if (!Offset && !VBase) {
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// Just cast back.
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return Builder.CreateBitCast(Value, BasePtrTy);
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}
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llvm::BasicBlock *CastNull = 0;
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llvm::BasicBlock *CastNotNull = 0;
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llvm::BasicBlock *CastEnd = 0;
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if (NullCheckValue) {
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CastNull = createBasicBlock("cast.null");
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CastNotNull = createBasicBlock("cast.notnull");
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CastEnd = createBasicBlock("cast.end");
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llvm::Value *IsNull =
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Builder.CreateICmpEQ(Value,
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llvm::Constant::getNullValue(Value->getType()));
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Builder.CreateCondBr(IsNull, CastNull, CastNotNull);
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EmitBlock(CastNotNull);
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}
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if (VBase)
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VirtualOffset = GetVirtualBaseClassOffset(Value, Class, VBase);
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const llvm::Type *PtrDiffTy = ConvertType(getContext().getPointerDiffType());
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llvm::Value *NonVirtualOffset = 0;
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if (Offset)
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NonVirtualOffset = llvm::ConstantInt::get(PtrDiffTy, Offset);
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llvm::Value *BaseOffset;
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if (VBase) {
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if (NonVirtualOffset)
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BaseOffset = Builder.CreateAdd(VirtualOffset, NonVirtualOffset);
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else
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BaseOffset = VirtualOffset;
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} else
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BaseOffset = NonVirtualOffset;
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// Apply the base offset.
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const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext());
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Value = Builder.CreateBitCast(Value, Int8PtrTy);
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Value = Builder.CreateGEP(Value, BaseOffset, "add.ptr");
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// Cast back.
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Value = Builder.CreateBitCast(Value, BasePtrTy);
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if (NullCheckValue) {
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Builder.CreateBr(CastEnd);
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EmitBlock(CastNull);
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Builder.CreateBr(CastEnd);
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EmitBlock(CastEnd);
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llvm::PHINode *PHI = Builder.CreatePHI(Value->getType());
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PHI->reserveOperandSpace(2);
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PHI->addIncoming(Value, CastNotNull);
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PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()),
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CastNull);
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Value = PHI;
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}
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return Value;
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}
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llvm::Value *
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CodeGenFunction::GetAddressOfDerivedClass(llvm::Value *Value,
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const CXXRecordDecl *Class,
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const CXXRecordDecl *DerivedClass,
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bool NullCheckValue) {
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QualType DerivedTy =
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getContext().getCanonicalType(
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getContext().getTypeDeclType(const_cast<CXXRecordDecl*>(DerivedClass)));
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const llvm::Type *DerivedPtrTy = ConvertType(DerivedTy)->getPointerTo();
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if (Class == DerivedClass) {
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// Just cast back.
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return Builder.CreateBitCast(Value, DerivedPtrTy);
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}
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llvm::Value *NonVirtualOffset =
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CGM.GetNonVirtualBaseClassOffset(DerivedClass, Class);
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if (!NonVirtualOffset) {
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// No offset, we can just cast back.
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return Builder.CreateBitCast(Value, DerivedPtrTy);
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}
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llvm::BasicBlock *CastNull = 0;
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llvm::BasicBlock *CastNotNull = 0;
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llvm::BasicBlock *CastEnd = 0;
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if (NullCheckValue) {
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CastNull = createBasicBlock("cast.null");
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CastNotNull = createBasicBlock("cast.notnull");
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CastEnd = createBasicBlock("cast.end");
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llvm::Value *IsNull =
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Builder.CreateICmpEQ(Value,
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llvm::Constant::getNullValue(Value->getType()));
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Builder.CreateCondBr(IsNull, CastNull, CastNotNull);
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EmitBlock(CastNotNull);
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}
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// Apply the offset.
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Value = Builder.CreatePtrToInt(Value, NonVirtualOffset->getType());
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Value = Builder.CreateSub(Value, NonVirtualOffset);
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Value = Builder.CreateIntToPtr(Value, DerivedPtrTy);
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// Just cast.
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Value = Builder.CreateBitCast(Value, DerivedPtrTy);
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if (NullCheckValue) {
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Builder.CreateBr(CastEnd);
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EmitBlock(CastNull);
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Builder.CreateBr(CastEnd);
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EmitBlock(CastEnd);
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llvm::PHINode *PHI = Builder.CreatePHI(Value->getType());
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PHI->reserveOperandSpace(2);
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PHI->addIncoming(Value, CastNotNull);
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PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()),
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CastNull);
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Value = PHI;
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}
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return Value;
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}
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/// EmitClassAggrMemberwiseCopy - This routine generates code to copy a class
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/// array of objects from SrcValue to DestValue. Copying can be either a bitwise
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/// copy or via a copy constructor call.
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// FIXME. Consolidate this with EmitCXXAggrConstructorCall.
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void CodeGenFunction::EmitClassAggrMemberwiseCopy(llvm::Value *Dest,
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llvm::Value *Src,
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const ArrayType *Array,
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const CXXRecordDecl *BaseClassDecl,
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QualType Ty) {
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const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
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assert(CA && "VLA cannot be copied over");
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bool BitwiseCopy = BaseClassDecl->hasTrivialCopyConstructor();
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// Create a temporary for the loop index and initialize it with 0.
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llvm::Value *IndexPtr = CreateTempAlloca(llvm::Type::getInt64Ty(VMContext),
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"loop.index");
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llvm::Value* zeroConstant =
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llvm::Constant::getNullValue(llvm::Type::getInt64Ty(VMContext));
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Builder.CreateStore(zeroConstant, IndexPtr);
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// Start the loop with a block that tests the condition.
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llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
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llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
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EmitBlock(CondBlock);
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llvm::BasicBlock *ForBody = createBasicBlock("for.body");
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// Generate: if (loop-index < number-of-elements fall to the loop body,
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// otherwise, go to the block after the for-loop.
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uint64_t NumElements = getContext().getConstantArrayElementCount(CA);
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llvm::Value * NumElementsPtr =
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llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), NumElements);
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llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
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llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElementsPtr,
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"isless");
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// If the condition is true, execute the body.
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Builder.CreateCondBr(IsLess, ForBody, AfterFor);
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EmitBlock(ForBody);
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llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
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// Inside the loop body, emit the constructor call on the array element.
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Counter = Builder.CreateLoad(IndexPtr);
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Src = Builder.CreateInBoundsGEP(Src, Counter, "srcaddress");
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Dest = Builder.CreateInBoundsGEP(Dest, Counter, "destaddress");
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if (BitwiseCopy)
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EmitAggregateCopy(Dest, Src, Ty);
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else if (CXXConstructorDecl *BaseCopyCtor =
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BaseClassDecl->getCopyConstructor(getContext(), 0)) {
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llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(BaseCopyCtor,
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Ctor_Complete);
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CallArgList CallArgs;
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// Push the this (Dest) ptr.
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CallArgs.push_back(std::make_pair(RValue::get(Dest),
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BaseCopyCtor->getThisType(getContext())));
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// Push the Src ptr.
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CallArgs.push_back(std::make_pair(RValue::get(Src),
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BaseCopyCtor->getParamDecl(0)->getType()));
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const FunctionProtoType *FPT
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= BaseCopyCtor->getType()->getAs<FunctionProtoType>();
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EmitCall(CGM.getTypes().getFunctionInfo(CallArgs, FPT),
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Callee, ReturnValueSlot(), CallArgs, BaseCopyCtor);
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}
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EmitBlock(ContinueBlock);
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// Emit the increment of the loop counter.
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llvm::Value *NextVal = llvm::ConstantInt::get(Counter->getType(), 1);
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Counter = Builder.CreateLoad(IndexPtr);
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NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
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Builder.CreateStore(NextVal, IndexPtr);
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// Finally, branch back up to the condition for the next iteration.
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EmitBranch(CondBlock);
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// Emit the fall-through block.
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EmitBlock(AfterFor, true);
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}
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/// EmitClassAggrCopyAssignment - This routine generates code to assign a class
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/// array of objects from SrcValue to DestValue. Assignment can be either a
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/// bitwise assignment or via a copy assignment operator function call.
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/// FIXME. This can be consolidated with EmitClassAggrMemberwiseCopy
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void CodeGenFunction::EmitClassAggrCopyAssignment(llvm::Value *Dest,
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llvm::Value *Src,
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const ArrayType *Array,
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const CXXRecordDecl *BaseClassDecl,
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QualType Ty) {
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const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
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assert(CA && "VLA cannot be asssigned");
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bool BitwiseAssign = BaseClassDecl->hasTrivialCopyAssignment();
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// Create a temporary for the loop index and initialize it with 0.
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llvm::Value *IndexPtr = CreateTempAlloca(llvm::Type::getInt64Ty(VMContext),
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"loop.index");
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llvm::Value* zeroConstant =
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llvm::Constant::getNullValue(llvm::Type::getInt64Ty(VMContext));
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Builder.CreateStore(zeroConstant, IndexPtr);
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// Start the loop with a block that tests the condition.
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llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
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llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
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EmitBlock(CondBlock);
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llvm::BasicBlock *ForBody = createBasicBlock("for.body");
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// Generate: if (loop-index < number-of-elements fall to the loop body,
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// otherwise, go to the block after the for-loop.
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uint64_t NumElements = getContext().getConstantArrayElementCount(CA);
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llvm::Value * NumElementsPtr =
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llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), NumElements);
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llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
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llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElementsPtr,
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"isless");
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// If the condition is true, execute the body.
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Builder.CreateCondBr(IsLess, ForBody, AfterFor);
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EmitBlock(ForBody);
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llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
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// Inside the loop body, emit the assignment operator call on array element.
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Counter = Builder.CreateLoad(IndexPtr);
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Src = Builder.CreateInBoundsGEP(Src, Counter, "srcaddress");
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Dest = Builder.CreateInBoundsGEP(Dest, Counter, "destaddress");
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const CXXMethodDecl *MD = 0;
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if (BitwiseAssign)
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EmitAggregateCopy(Dest, Src, Ty);
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else {
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BaseClassDecl->hasConstCopyAssignment(getContext(), MD);
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assert(MD && "EmitClassAggrCopyAssignment - No user assign");
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const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
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const llvm::Type *LTy =
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CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
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FPT->isVariadic());
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llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, LTy);
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CallArgList CallArgs;
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// Push the this (Dest) ptr.
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CallArgs.push_back(std::make_pair(RValue::get(Dest),
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MD->getThisType(getContext())));
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// Push the Src ptr.
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QualType SrcTy = MD->getParamDecl(0)->getType();
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RValue SrcValue = SrcTy->isReferenceType() ? RValue::get(Src) :
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RValue::getAggregate(Src);
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CallArgs.push_back(std::make_pair(SrcValue, SrcTy));
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EmitCall(CGM.getTypes().getFunctionInfo(CallArgs, FPT),
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Callee, ReturnValueSlot(), CallArgs, MD);
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}
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EmitBlock(ContinueBlock);
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// Emit the increment of the loop counter.
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llvm::Value *NextVal = llvm::ConstantInt::get(Counter->getType(), 1);
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Counter = Builder.CreateLoad(IndexPtr);
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NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
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Builder.CreateStore(NextVal, IndexPtr);
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// Finally, branch back up to the condition for the next iteration.
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EmitBranch(CondBlock);
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// Emit the fall-through block.
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EmitBlock(AfterFor, true);
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}
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/// GetVTTParameter - Return the VTT parameter that should be passed to a
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/// base constructor/destructor with virtual bases.
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static llvm::Value *GetVTTParameter(CodeGenFunction &CGF, GlobalDecl GD) {
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if (!CGVtableInfo::needsVTTParameter(GD)) {
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// This constructor/destructor does not need a VTT parameter.
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return 0;
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}
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const CXXRecordDecl *RD = cast<CXXMethodDecl>(CGF.CurFuncDecl)->getParent();
|
|
const CXXRecordDecl *Base = cast<CXXMethodDecl>(GD.getDecl())->getParent();
|
|
|
|
llvm::Value *VTT;
|
|
|
|
uint64_t SubVTTIndex;
|
|
|
|
// If the record matches the base, this is the complete ctor/dtor
|
|
// variant calling the base variant in a class with virtual bases.
|
|
if (RD == Base) {
|
|
assert(!CGVtableInfo::needsVTTParameter(CGF.CurGD) &&
|
|
"doing no-op VTT offset in base dtor/ctor?");
|
|
SubVTTIndex = 0;
|
|
} else {
|
|
SubVTTIndex = CGF.CGM.getVtableInfo().getSubVTTIndex(RD, Base);
|
|
assert(SubVTTIndex != 0 && "Sub-VTT index must be greater than zero!");
|
|
}
|
|
|
|
if (CGVtableInfo::needsVTTParameter(CGF.CurGD)) {
|
|
// A VTT parameter was passed to the constructor, use it.
|
|
VTT = CGF.LoadCXXVTT();
|
|
VTT = CGF.Builder.CreateConstInBoundsGEP1_64(VTT, SubVTTIndex);
|
|
} else {
|
|
// We're the complete constructor, so get the VTT by name.
|
|
VTT = CGF.CGM.getVtableInfo().getVTT(RD);
|
|
VTT = CGF.Builder.CreateConstInBoundsGEP2_64(VTT, 0, SubVTTIndex);
|
|
}
|
|
|
|
return VTT;
|
|
}
|
|
|
|
|
|
/// EmitClassMemberwiseCopy - This routine generates code to copy a class
|
|
/// object from SrcValue to DestValue. Copying can be either a bitwise copy
|
|
/// or via a copy constructor call.
|
|
void CodeGenFunction::EmitClassMemberwiseCopy(
|
|
llvm::Value *Dest, llvm::Value *Src,
|
|
const CXXRecordDecl *ClassDecl,
|
|
const CXXRecordDecl *BaseClassDecl, QualType Ty) {
|
|
CXXCtorType CtorType = Ctor_Complete;
|
|
|
|
if (ClassDecl) {
|
|
Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl,
|
|
/*NullCheckValue=*/false);
|
|
Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl,
|
|
/*NullCheckValue=*/false);
|
|
|
|
// We want to call the base constructor.
|
|
CtorType = Ctor_Base;
|
|
}
|
|
if (BaseClassDecl->hasTrivialCopyConstructor()) {
|
|
EmitAggregateCopy(Dest, Src, Ty);
|
|
return;
|
|
}
|
|
|
|
if (CXXConstructorDecl *BaseCopyCtor =
|
|
BaseClassDecl->getCopyConstructor(getContext(), 0)) {
|
|
llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(BaseCopyCtor, CtorType);
|
|
CallArgList CallArgs;
|
|
// Push the this (Dest) ptr.
|
|
CallArgs.push_back(std::make_pair(RValue::get(Dest),
|
|
BaseCopyCtor->getThisType(getContext())));
|
|
|
|
// Push the VTT parameter, if necessary.
|
|
if (llvm::Value *VTT =
|
|
GetVTTParameter(*this, GlobalDecl(BaseCopyCtor, CtorType))) {
|
|
QualType T = getContext().getPointerType(getContext().VoidPtrTy);
|
|
CallArgs.push_back(std::make_pair(RValue::get(VTT), T));
|
|
}
|
|
|
|
// Push the Src ptr.
|
|
CallArgs.push_back(std::make_pair(RValue::get(Src),
|
|
BaseCopyCtor->getParamDecl(0)->getType()));
|
|
const FunctionProtoType *FPT =
|
|
BaseCopyCtor->getType()->getAs<FunctionProtoType>();
|
|
EmitCall(CGM.getTypes().getFunctionInfo(CallArgs, FPT),
|
|
Callee, ReturnValueSlot(), CallArgs, BaseCopyCtor);
|
|
}
|
|
}
|
|
|
|
/// EmitClassCopyAssignment - This routine generates code to copy assign a class
|
|
/// object from SrcValue to DestValue. Assignment can be either a bitwise
|
|
/// assignment of via an assignment operator call.
|
|
// FIXME. Consolidate this with EmitClassMemberwiseCopy as they share a lot.
|
|
void CodeGenFunction::EmitClassCopyAssignment(
|
|
llvm::Value *Dest, llvm::Value *Src,
|
|
const CXXRecordDecl *ClassDecl,
|
|
const CXXRecordDecl *BaseClassDecl,
|
|
QualType Ty) {
|
|
if (ClassDecl) {
|
|
Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl,
|
|
/*NullCheckValue=*/false);
|
|
Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl,
|
|
/*NullCheckValue=*/false);
|
|
}
|
|
if (BaseClassDecl->hasTrivialCopyAssignment()) {
|
|
EmitAggregateCopy(Dest, Src, Ty);
|
|
return;
|
|
}
|
|
|
|
const CXXMethodDecl *MD = 0;
|
|
BaseClassDecl->hasConstCopyAssignment(getContext(), MD);
|
|
assert(MD && "EmitClassCopyAssignment - missing copy assign");
|
|
|
|
const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
|
|
const llvm::Type *LTy =
|
|
CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
|
|
FPT->isVariadic());
|
|
llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, LTy);
|
|
|
|
CallArgList CallArgs;
|
|
// Push the this (Dest) ptr.
|
|
CallArgs.push_back(std::make_pair(RValue::get(Dest),
|
|
MD->getThisType(getContext())));
|
|
|
|
// Push the Src ptr.
|
|
QualType SrcTy = MD->getParamDecl(0)->getType();
|
|
RValue SrcValue = SrcTy->isReferenceType() ? RValue::get(Src) :
|
|
RValue::getAggregate(Src);
|
|
CallArgs.push_back(std::make_pair(SrcValue, SrcTy));
|
|
EmitCall(CGM.getTypes().getFunctionInfo(CallArgs, FPT),
|
|
Callee, ReturnValueSlot(), CallArgs, MD);
|
|
}
|
|
|
|
/// SynthesizeCXXCopyConstructor - This routine implicitly defines body of a
|
|
/// copy constructor, in accordance with section 12.8 (p7 and p8) of C++03
|
|
/// The implicitly-defined copy constructor for class X performs a memberwise
|
|
/// copy of its subobjects. The order of copying is the same as the order of
|
|
/// initialization of bases and members in a user-defined constructor
|
|
/// Each subobject is copied in the manner appropriate to its type:
|
|
/// if the subobject is of class type, the copy constructor for the class is
|
|
/// used;
|
|
/// if the subobject is an array, each element is copied, in the manner
|
|
/// appropriate to the element type;
|
|
/// if the subobject is of scalar type, the built-in assignment operator is
|
|
/// used.
|
|
/// Virtual base class subobjects shall be copied only once by the
|
|
/// implicitly-defined copy constructor
|
|
|
|
void
|
|
CodeGenFunction::SynthesizeCXXCopyConstructor(const FunctionArgList &Args) {
|
|
const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(CurGD.getDecl());
|
|
const CXXRecordDecl *ClassDecl = Ctor->getParent();
|
|
assert(!ClassDecl->hasUserDeclaredCopyConstructor() &&
|
|
"SynthesizeCXXCopyConstructor - copy constructor has definition already");
|
|
assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
|
|
|
|
FunctionArgList::const_iterator i = Args.begin();
|
|
const VarDecl *ThisArg = i->first;
|
|
llvm::Value *ThisObj = GetAddrOfLocalVar(ThisArg);
|
|
llvm::Value *LoadOfThis = Builder.CreateLoad(ThisObj, "this");
|
|
const VarDecl *SrcArg = (i+1)->first;
|
|
llvm::Value *SrcObj = GetAddrOfLocalVar(SrcArg);
|
|
llvm::Value *LoadOfSrc = Builder.CreateLoad(SrcObj);
|
|
|
|
for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
|
|
Base != ClassDecl->bases_end(); ++Base) {
|
|
// FIXME. copy constrution of virtual base NYI
|
|
if (Base->isVirtual())
|
|
continue;
|
|
|
|
CXXRecordDecl *BaseClassDecl
|
|
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
|
|
EmitClassMemberwiseCopy(LoadOfThis, LoadOfSrc, ClassDecl, BaseClassDecl,
|
|
Base->getType());
|
|
}
|
|
|
|
for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
|
|
E = ClassDecl->field_end(); I != E; ++I) {
|
|
const FieldDecl *Field = *I;
|
|
|
|
QualType FieldType = getContext().getCanonicalType(Field->getType());
|
|
const ConstantArrayType *Array =
|
|
getContext().getAsConstantArrayType(FieldType);
|
|
if (Array)
|
|
FieldType = getContext().getBaseElementType(FieldType);
|
|
|
|
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
|
|
CXXRecordDecl *FieldClassDecl
|
|
= cast<CXXRecordDecl>(FieldClassType->getDecl());
|
|
LValue LHS = EmitLValueForField(LoadOfThis, Field, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, Field, 0);
|
|
if (Array) {
|
|
const llvm::Type *BasePtr = ConvertType(FieldType);
|
|
BasePtr = llvm::PointerType::getUnqual(BasePtr);
|
|
llvm::Value *DestBaseAddrPtr =
|
|
Builder.CreateBitCast(LHS.getAddress(), BasePtr);
|
|
llvm::Value *SrcBaseAddrPtr =
|
|
Builder.CreateBitCast(RHS.getAddress(), BasePtr);
|
|
EmitClassAggrMemberwiseCopy(DestBaseAddrPtr, SrcBaseAddrPtr, Array,
|
|
FieldClassDecl, FieldType);
|
|
}
|
|
else
|
|
EmitClassMemberwiseCopy(LHS.getAddress(), RHS.getAddress(),
|
|
0 /*ClassDecl*/, FieldClassDecl, FieldType);
|
|
continue;
|
|
}
|
|
|
|
// Do a built-in assignment of scalar data members.
|
|
LValue LHS = EmitLValueForFieldInitialization(LoadOfThis, Field, 0);
|
|
LValue RHS = EmitLValueForFieldInitialization(LoadOfSrc, Field, 0);
|
|
|
|
if (!hasAggregateLLVMType(Field->getType())) {
|
|
RValue RVRHS = EmitLoadOfLValue(RHS, Field->getType());
|
|
EmitStoreThroughLValue(RVRHS, LHS, Field->getType());
|
|
} else if (Field->getType()->isAnyComplexType()) {
|
|
ComplexPairTy Pair = LoadComplexFromAddr(RHS.getAddress(),
|
|
RHS.isVolatileQualified());
|
|
StoreComplexToAddr(Pair, LHS.getAddress(), LHS.isVolatileQualified());
|
|
} else {
|
|
EmitAggregateCopy(LHS.getAddress(), RHS.getAddress(), Field->getType());
|
|
}
|
|
}
|
|
|
|
InitializeVtablePtrs(ClassDecl);
|
|
}
|
|
|
|
/// SynthesizeCXXCopyAssignment - Implicitly define copy assignment operator.
|
|
/// Before the implicitly-declared copy assignment operator for a class is
|
|
/// implicitly defined, all implicitly- declared copy assignment operators for
|
|
/// its direct base classes and its nonstatic data members shall have been
|
|
/// implicitly defined. [12.8-p12]
|
|
/// The implicitly-defined copy assignment operator for class X performs
|
|
/// memberwise assignment of its subob- jects. The direct base classes of X are
|
|
/// assigned first, in the order of their declaration in
|
|
/// the base-specifier-list, and then the immediate nonstatic data members of X
|
|
/// are assigned, in the order in which they were declared in the class
|
|
/// definition.Each subobject is assigned in the manner appropriate to its type:
|
|
/// if the subobject is of class type, the copy assignment operator for the
|
|
/// class is used (as if by explicit qualification; that is, ignoring any
|
|
/// possible virtual overriding functions in more derived classes);
|
|
///
|
|
/// if the subobject is an array, each element is assigned, in the manner
|
|
/// appropriate to the element type;
|
|
///
|
|
/// if the subobject is of scalar type, the built-in assignment operator is
|
|
/// used.
|
|
void CodeGenFunction::SynthesizeCXXCopyAssignment(const FunctionArgList &Args) {
|
|
const CXXMethodDecl *CD = cast<CXXMethodDecl>(CurGD.getDecl());
|
|
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(CD->getDeclContext());
|
|
assert(!ClassDecl->hasUserDeclaredCopyAssignment() &&
|
|
"SynthesizeCXXCopyAssignment - copy assignment has user declaration");
|
|
|
|
FunctionArgList::const_iterator i = Args.begin();
|
|
const VarDecl *ThisArg = i->first;
|
|
llvm::Value *ThisObj = GetAddrOfLocalVar(ThisArg);
|
|
llvm::Value *LoadOfThis = Builder.CreateLoad(ThisObj, "this");
|
|
const VarDecl *SrcArg = (i+1)->first;
|
|
llvm::Value *SrcObj = GetAddrOfLocalVar(SrcArg);
|
|
llvm::Value *LoadOfSrc = Builder.CreateLoad(SrcObj);
|
|
|
|
for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
|
|
Base != ClassDecl->bases_end(); ++Base) {
|
|
// FIXME. copy assignment of virtual base NYI
|
|
if (Base->isVirtual())
|
|
continue;
|
|
|
|
CXXRecordDecl *BaseClassDecl
|
|
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
|
|
EmitClassCopyAssignment(LoadOfThis, LoadOfSrc, ClassDecl, BaseClassDecl,
|
|
Base->getType());
|
|
}
|
|
|
|
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
|
|
FieldEnd = ClassDecl->field_end();
|
|
Field != FieldEnd; ++Field) {
|
|
QualType FieldType = getContext().getCanonicalType((*Field)->getType());
|
|
const ConstantArrayType *Array =
|
|
getContext().getAsConstantArrayType(FieldType);
|
|
if (Array)
|
|
FieldType = getContext().getBaseElementType(FieldType);
|
|
|
|
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
|
|
CXXRecordDecl *FieldClassDecl
|
|
= cast<CXXRecordDecl>(FieldClassType->getDecl());
|
|
LValue LHS = EmitLValueForField(LoadOfThis, *Field, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, *Field, 0);
|
|
if (Array) {
|
|
const llvm::Type *BasePtr = ConvertType(FieldType);
|
|
BasePtr = llvm::PointerType::getUnqual(BasePtr);
|
|
llvm::Value *DestBaseAddrPtr =
|
|
Builder.CreateBitCast(LHS.getAddress(), BasePtr);
|
|
llvm::Value *SrcBaseAddrPtr =
|
|
Builder.CreateBitCast(RHS.getAddress(), BasePtr);
|
|
EmitClassAggrCopyAssignment(DestBaseAddrPtr, SrcBaseAddrPtr, Array,
|
|
FieldClassDecl, FieldType);
|
|
}
|
|
else
|
|
EmitClassCopyAssignment(LHS.getAddress(), RHS.getAddress(),
|
|
0 /*ClassDecl*/, FieldClassDecl, FieldType);
|
|
continue;
|
|
}
|
|
// Do a built-in assignment of scalar data members.
|
|
LValue LHS = EmitLValueForField(LoadOfThis, *Field, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, *Field, 0);
|
|
if (!hasAggregateLLVMType(Field->getType())) {
|
|
RValue RVRHS = EmitLoadOfLValue(RHS, Field->getType());
|
|
EmitStoreThroughLValue(RVRHS, LHS, Field->getType());
|
|
} else if (Field->getType()->isAnyComplexType()) {
|
|
ComplexPairTy Pair = LoadComplexFromAddr(RHS.getAddress(),
|
|
RHS.isVolatileQualified());
|
|
StoreComplexToAddr(Pair, LHS.getAddress(), LHS.isVolatileQualified());
|
|
} else {
|
|
EmitAggregateCopy(LHS.getAddress(), RHS.getAddress(), Field->getType());
|
|
}
|
|
}
|
|
|
|
// return *this;
|
|
Builder.CreateStore(LoadOfThis, ReturnValue);
|
|
}
|
|
|
|
static void EmitBaseInitializer(CodeGenFunction &CGF,
|
|
const CXXRecordDecl *ClassDecl,
|
|
CXXBaseOrMemberInitializer *BaseInit,
|
|
CXXCtorType CtorType) {
|
|
assert(BaseInit->isBaseInitializer() &&
|
|
"Must have base initializer!");
|
|
|
|
llvm::Value *ThisPtr = CGF.LoadCXXThis();
|
|
|
|
const Type *BaseType = BaseInit->getBaseClass();
|
|
CXXRecordDecl *BaseClassDecl =
|
|
cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl());
|
|
|
|
// FIXME: This method of determining whether a base is virtual is ridiculous;
|
|
// it should be part of BaseInit.
|
|
bool isBaseVirtual = false;
|
|
for (CXXRecordDecl::base_class_const_iterator I = ClassDecl->vbases_begin(),
|
|
E = ClassDecl->vbases_end(); I != E; ++I)
|
|
if (I->getType()->getAs<RecordType>()->getDecl() == BaseClassDecl) {
|
|
isBaseVirtual = true;
|
|
break;
|
|
}
|
|
|
|
// The base constructor doesn't construct virtual bases.
|
|
if (CtorType == Ctor_Base && isBaseVirtual)
|
|
return;
|
|
|
|
// We can pretend to be a complete class because it only matters for
|
|
// virtual bases, and we only do virtual bases for complete ctors.
|
|
llvm::Value *V = ThisPtr;
|
|
V = CGF.GetAddressOfBaseOfCompleteClass(V, isBaseVirtual,
|
|
ClassDecl, BaseClassDecl);
|
|
|
|
CGF.EmitAggExpr(BaseInit->getInit(), V, false, false, true);
|
|
|
|
if (CGF.Exceptions && !BaseClassDecl->hasTrivialDestructor()) {
|
|
// FIXME: Is this OK for C++0x delegating constructors?
|
|
CodeGenFunction::EHCleanupBlock Cleanup(CGF);
|
|
|
|
CXXDestructorDecl *DD = BaseClassDecl->getDestructor(CGF.getContext());
|
|
CGF.EmitCXXDestructorCall(DD, Dtor_Base, V);
|
|
}
|
|
}
|
|
|
|
static void EmitMemberInitializer(CodeGenFunction &CGF,
|
|
const CXXRecordDecl *ClassDecl,
|
|
CXXBaseOrMemberInitializer *MemberInit) {
|
|
assert(MemberInit->isMemberInitializer() &&
|
|
"Must have member initializer!");
|
|
|
|
// non-static data member initializers.
|
|
FieldDecl *Field = MemberInit->getMember();
|
|
QualType FieldType = CGF.getContext().getCanonicalType(Field->getType());
|
|
|
|
llvm::Value *ThisPtr = CGF.LoadCXXThis();
|
|
LValue LHS = CGF.EmitLValueForFieldInitialization(ThisPtr, Field, 0);
|
|
|
|
// If we are initializing an anonymous union field, drill down to the field.
|
|
if (MemberInit->getAnonUnionMember()) {
|
|
Field = MemberInit->getAnonUnionMember();
|
|
LHS = CGF.EmitLValueForField(LHS.getAddress(), Field, 0);
|
|
FieldType = Field->getType();
|
|
}
|
|
|
|
// FIXME: If there's no initializer and the CXXBaseOrMemberInitializer
|
|
// was implicitly generated, we shouldn't be zeroing memory.
|
|
RValue RHS;
|
|
if (FieldType->isReferenceType()) {
|
|
RHS = CGF.EmitReferenceBindingToExpr(MemberInit->getInit(),
|
|
/*IsInitializer=*/true);
|
|
CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
|
|
} else if (FieldType->isArrayType() && !MemberInit->getInit()) {
|
|
CGF.EmitMemSetToZero(LHS.getAddress(), Field->getType());
|
|
} else if (!CGF.hasAggregateLLVMType(Field->getType())) {
|
|
RHS = RValue::get(CGF.EmitScalarExpr(MemberInit->getInit(), true));
|
|
CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
|
|
} else if (MemberInit->getInit()->getType()->isAnyComplexType()) {
|
|
CGF.EmitComplexExprIntoAddr(MemberInit->getInit(), LHS.getAddress(),
|
|
LHS.isVolatileQualified());
|
|
} else {
|
|
CGF.EmitAggExpr(MemberInit->getInit(), LHS.getAddress(),
|
|
LHS.isVolatileQualified(), false, true);
|
|
|
|
if (!CGF.Exceptions)
|
|
return;
|
|
|
|
const RecordType *RT = FieldType->getAs<RecordType>();
|
|
if (!RT)
|
|
return;
|
|
|
|
CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
|
|
if (!RD->hasTrivialDestructor()) {
|
|
// FIXME: Is this OK for C++0x delegating constructors?
|
|
CodeGenFunction::EHCleanupBlock Cleanup(CGF);
|
|
|
|
llvm::Value *ThisPtr = CGF.LoadCXXThis();
|
|
LValue LHS = CGF.EmitLValueForField(ThisPtr, Field, 0);
|
|
|
|
CXXDestructorDecl *DD = RD->getDestructor(CGF.getContext());
|
|
CGF.EmitCXXDestructorCall(DD, Dtor_Complete, LHS.getAddress());
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Checks whether the given constructor is a valid subject for the
|
|
/// complete-to-base constructor delegation optimization, i.e.
|
|
/// emitting the complete constructor as a simple call to the base
|
|
/// constructor.
|
|
static bool IsConstructorDelegationValid(const CXXConstructorDecl *Ctor) {
|
|
|
|
// Currently we disable the optimization for classes with virtual
|
|
// bases because (1) the addresses of parameter variables need to be
|
|
// consistent across all initializers but (2) the delegate function
|
|
// call necessarily creates a second copy of the parameter variable.
|
|
//
|
|
// The limiting example (purely theoretical AFAIK):
|
|
// struct A { A(int &c) { c++; } };
|
|
// struct B : virtual A {
|
|
// B(int count) : A(count) { printf("%d\n", count); }
|
|
// };
|
|
// ...although even this example could in principle be emitted as a
|
|
// delegation since the address of the parameter doesn't escape.
|
|
if (Ctor->getParent()->getNumVBases()) {
|
|
// TODO: white-list trivial vbase initializers. This case wouldn't
|
|
// be subject to the restrictions below.
|
|
|
|
// TODO: white-list cases where:
|
|
// - there are no non-reference parameters to the constructor
|
|
// - the initializers don't access any non-reference parameters
|
|
// - the initializers don't take the address of non-reference
|
|
// parameters
|
|
// - etc.
|
|
// If we ever add any of the above cases, remember that:
|
|
// - function-try-blocks will always blacklist this optimization
|
|
// - we need to perform the constructor prologue and cleanup in
|
|
// EmitConstructorBody.
|
|
|
|
return false;
|
|
}
|
|
|
|
// We also disable the optimization for variadic functions because
|
|
// it's impossible to "re-pass" varargs.
|
|
if (Ctor->getType()->getAs<FunctionProtoType>()->isVariadic())
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/// EmitConstructorBody - Emits the body of the current constructor.
|
|
void CodeGenFunction::EmitConstructorBody(FunctionArgList &Args) {
|
|
const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(CurGD.getDecl());
|
|
CXXCtorType CtorType = CurGD.getCtorType();
|
|
|
|
// Before we go any further, try the complete->base constructor
|
|
// delegation optimization.
|
|
if (CtorType == Ctor_Complete && IsConstructorDelegationValid(Ctor)) {
|
|
EmitDelegateCXXConstructorCall(Ctor, Ctor_Base, Args);
|
|
return;
|
|
}
|
|
|
|
Stmt *Body = Ctor->getBody();
|
|
|
|
// Enter the function-try-block before the constructor prologue if
|
|
// applicable.
|
|
CXXTryStmtInfo TryInfo;
|
|
bool IsTryBody = (Body && isa<CXXTryStmt>(Body));
|
|
|
|
if (IsTryBody)
|
|
TryInfo = EnterCXXTryStmt(*cast<CXXTryStmt>(Body));
|
|
|
|
unsigned CleanupStackSize = CleanupEntries.size();
|
|
|
|
// Emit the constructor prologue, i.e. the base and member
|
|
// initializers.
|
|
EmitCtorPrologue(Ctor, CtorType);
|
|
|
|
// Emit the body of the statement.
|
|
if (IsTryBody)
|
|
EmitStmt(cast<CXXTryStmt>(Body)->getTryBlock());
|
|
else if (Body)
|
|
EmitStmt(Body);
|
|
else {
|
|
assert(Ctor->isImplicit() && "bodyless ctor not implicit");
|
|
if (!Ctor->isDefaultConstructor()) {
|
|
assert(Ctor->isCopyConstructor());
|
|
SynthesizeCXXCopyConstructor(Args);
|
|
}
|
|
}
|
|
|
|
// Emit any cleanup blocks associated with the member or base
|
|
// initializers, which includes (along the exceptional path) the
|
|
// destructors for those members and bases that were fully
|
|
// constructed.
|
|
EmitCleanupBlocks(CleanupStackSize);
|
|
|
|
if (IsTryBody)
|
|
ExitCXXTryStmt(*cast<CXXTryStmt>(Body), TryInfo);
|
|
}
|
|
|
|
/// EmitCtorPrologue - This routine generates necessary code to initialize
|
|
/// base classes and non-static data members belonging to this constructor.
|
|
void CodeGenFunction::EmitCtorPrologue(const CXXConstructorDecl *CD,
|
|
CXXCtorType CtorType) {
|
|
const CXXRecordDecl *ClassDecl = CD->getParent();
|
|
|
|
llvm::SmallVector<CXXBaseOrMemberInitializer *, 8> MemberInitializers;
|
|
|
|
// FIXME: Add vbase initialization
|
|
|
|
for (CXXConstructorDecl::init_const_iterator B = CD->init_begin(),
|
|
E = CD->init_end();
|
|
B != E; ++B) {
|
|
CXXBaseOrMemberInitializer *Member = (*B);
|
|
|
|
assert(LiveTemporaries.empty() &&
|
|
"Should not have any live temporaries at initializer start!");
|
|
|
|
if (Member->isBaseInitializer())
|
|
EmitBaseInitializer(*this, ClassDecl, Member, CtorType);
|
|
else
|
|
MemberInitializers.push_back(Member);
|
|
}
|
|
|
|
InitializeVtablePtrs(ClassDecl);
|
|
|
|
for (unsigned I = 0, E = MemberInitializers.size(); I != E; ++I) {
|
|
assert(LiveTemporaries.empty() &&
|
|
"Should not have any live temporaries at initializer start!");
|
|
|
|
EmitMemberInitializer(*this, ClassDecl, MemberInitializers[I]);
|
|
}
|
|
}
|
|
|
|
/// EmitDestructorBody - Emits the body of the current destructor.
|
|
void CodeGenFunction::EmitDestructorBody(FunctionArgList &Args) {
|
|
const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CurGD.getDecl());
|
|
CXXDtorType DtorType = CurGD.getDtorType();
|
|
|
|
Stmt *Body = Dtor->getBody();
|
|
|
|
// If the body is a function-try-block, enter the try before
|
|
// anything else --- unless we're in a deleting destructor, in which
|
|
// case we're just going to call the complete destructor and then
|
|
// call operator delete() on the way out.
|
|
CXXTryStmtInfo TryInfo;
|
|
bool isTryBody = (DtorType != Dtor_Deleting &&
|
|
Body && isa<CXXTryStmt>(Body));
|
|
if (isTryBody)
|
|
TryInfo = EnterCXXTryStmt(*cast<CXXTryStmt>(Body));
|
|
|
|
llvm::BasicBlock *DtorEpilogue = createBasicBlock("dtor.epilogue");
|
|
PushCleanupBlock(DtorEpilogue);
|
|
|
|
bool SkipBody = false; // should get jump-threaded
|
|
|
|
// If this is the deleting variant, just invoke the complete
|
|
// variant, then call the appropriate operator delete() on the way
|
|
// out.
|
|
if (DtorType == Dtor_Deleting) {
|
|
EmitCXXDestructorCall(Dtor, Dtor_Complete, LoadCXXThis());
|
|
SkipBody = true;
|
|
|
|
// If this is the complete variant, just invoke the base variant;
|
|
// the epilogue will destruct the virtual bases. But we can't do
|
|
// this optimization if the body is a function-try-block, because
|
|
// we'd introduce *two* handler blocks.
|
|
} else if (!isTryBody && DtorType == Dtor_Complete) {
|
|
EmitCXXDestructorCall(Dtor, Dtor_Base, LoadCXXThis());
|
|
SkipBody = true;
|
|
|
|
// Otherwise, we're in the base variant, so we need to ensure the
|
|
// vtable ptrs are right before emitting the body.
|
|
} else {
|
|
InitializeVtablePtrs(Dtor->getParent());
|
|
}
|
|
|
|
// Emit the body of the statement.
|
|
if (SkipBody)
|
|
(void) 0;
|
|
else if (isTryBody)
|
|
EmitStmt(cast<CXXTryStmt>(Body)->getTryBlock());
|
|
else if (Body)
|
|
EmitStmt(Body);
|
|
else {
|
|
assert(Dtor->isImplicit() && "bodyless dtor not implicit");
|
|
// nothing to do besides what's in the epilogue
|
|
}
|
|
|
|
// Jump to the cleanup block.
|
|
CleanupBlockInfo Info = PopCleanupBlock();
|
|
assert(Info.CleanupBlock == DtorEpilogue && "Block mismatch!");
|
|
EmitBlock(DtorEpilogue);
|
|
|
|
// Emit the destructor epilogue now. If this is a complete
|
|
// destructor with a function-try-block, perform the base epilogue
|
|
// as well.
|
|
if (isTryBody && DtorType == Dtor_Complete)
|
|
EmitDtorEpilogue(Dtor, Dtor_Base);
|
|
EmitDtorEpilogue(Dtor, DtorType);
|
|
|
|
// Link up the cleanup information.
|
|
if (Info.SwitchBlock)
|
|
EmitBlock(Info.SwitchBlock);
|
|
if (Info.EndBlock)
|
|
EmitBlock(Info.EndBlock);
|
|
|
|
// Exit the try if applicable.
|
|
if (isTryBody)
|
|
ExitCXXTryStmt(*cast<CXXTryStmt>(Body), TryInfo);
|
|
}
|
|
|
|
/// EmitDtorEpilogue - Emit all code that comes at the end of class's
|
|
/// destructor. This is to call destructors on members and base classes
|
|
/// in reverse order of their construction.
|
|
void CodeGenFunction::EmitDtorEpilogue(const CXXDestructorDecl *DD,
|
|
CXXDtorType DtorType) {
|
|
assert(!DD->isTrivial() &&
|
|
"Should not emit dtor epilogue for trivial dtor!");
|
|
|
|
const CXXRecordDecl *ClassDecl = DD->getParent();
|
|
|
|
// In a deleting destructor, we've already called the complete
|
|
// destructor as a subroutine, so we just have to delete the
|
|
// appropriate value.
|
|
if (DtorType == Dtor_Deleting) {
|
|
assert(DD->getOperatorDelete() &&
|
|
"operator delete missing - EmitDtorEpilogue");
|
|
EmitDeleteCall(DD->getOperatorDelete(), LoadCXXThis(),
|
|
getContext().getTagDeclType(ClassDecl));
|
|
return;
|
|
}
|
|
|
|
// For complete destructors, we've already called the base
|
|
// destructor (in GenerateBody), so we just need to destruct all the
|
|
// virtual bases.
|
|
if (DtorType == Dtor_Complete) {
|
|
// Handle virtual bases.
|
|
for (CXXRecordDecl::reverse_base_class_const_iterator I =
|
|
ClassDecl->vbases_rbegin(), E = ClassDecl->vbases_rend();
|
|
I != E; ++I) {
|
|
const CXXBaseSpecifier &Base = *I;
|
|
CXXRecordDecl *BaseClassDecl
|
|
= cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
|
|
|
|
// Ignore trivial destructors.
|
|
if (BaseClassDecl->hasTrivialDestructor())
|
|
continue;
|
|
const CXXDestructorDecl *D = BaseClassDecl->getDestructor(getContext());
|
|
llvm::Value *V = GetAddressOfBaseOfCompleteClass(LoadCXXThis(),
|
|
true,
|
|
ClassDecl,
|
|
BaseClassDecl);
|
|
EmitCXXDestructorCall(D, Dtor_Base, V);
|
|
}
|
|
return;
|
|
}
|
|
|
|
assert(DtorType == Dtor_Base);
|
|
|
|
// Collect the fields.
|
|
llvm::SmallVector<const FieldDecl *, 16> FieldDecls;
|
|
for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
|
|
E = ClassDecl->field_end(); I != E; ++I) {
|
|
const FieldDecl *Field = *I;
|
|
|
|
QualType FieldType = getContext().getCanonicalType(Field->getType());
|
|
FieldType = getContext().getBaseElementType(FieldType);
|
|
|
|
const RecordType *RT = FieldType->getAs<RecordType>();
|
|
if (!RT)
|
|
continue;
|
|
|
|
CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
|
|
if (FieldClassDecl->hasTrivialDestructor())
|
|
continue;
|
|
|
|
FieldDecls.push_back(Field);
|
|
}
|
|
|
|
// Now destroy the fields.
|
|
for (size_t i = FieldDecls.size(); i > 0; --i) {
|
|
const FieldDecl *Field = FieldDecls[i - 1];
|
|
|
|
QualType FieldType = Field->getType();
|
|
const ConstantArrayType *Array =
|
|
getContext().getAsConstantArrayType(FieldType);
|
|
if (Array)
|
|
FieldType = getContext().getBaseElementType(FieldType);
|
|
|
|
const RecordType *RT = FieldType->getAs<RecordType>();
|
|
CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
|
|
|
|
llvm::Value *ThisPtr = LoadCXXThis();
|
|
|
|
LValue LHS = EmitLValueForField(ThisPtr, Field,
|
|
// FIXME: Qualifiers?
|
|
/*CVRQualifiers=*/0);
|
|
if (Array) {
|
|
const llvm::Type *BasePtr = ConvertType(FieldType);
|
|
BasePtr = llvm::PointerType::getUnqual(BasePtr);
|
|
llvm::Value *BaseAddrPtr =
|
|
Builder.CreateBitCast(LHS.getAddress(), BasePtr);
|
|
EmitCXXAggrDestructorCall(FieldClassDecl->getDestructor(getContext()),
|
|
Array, BaseAddrPtr);
|
|
} else
|
|
EmitCXXDestructorCall(FieldClassDecl->getDestructor(getContext()),
|
|
Dtor_Complete, LHS.getAddress());
|
|
}
|
|
|
|
// Destroy non-virtual bases.
|
|
for (CXXRecordDecl::reverse_base_class_const_iterator I =
|
|
ClassDecl->bases_rbegin(), E = ClassDecl->bases_rend(); I != E; ++I) {
|
|
const CXXBaseSpecifier &Base = *I;
|
|
|
|
// Ignore virtual bases.
|
|
if (Base.isVirtual())
|
|
continue;
|
|
|
|
CXXRecordDecl *BaseClassDecl
|
|
= cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
|
|
|
|
// Ignore trivial destructors.
|
|
if (BaseClassDecl->hasTrivialDestructor())
|
|
continue;
|
|
const CXXDestructorDecl *D = BaseClassDecl->getDestructor(getContext());
|
|
|
|
llvm::Value *V = GetAddressOfBaseClass(LoadCXXThis(),
|
|
ClassDecl, BaseClassDecl,
|
|
/*NullCheckValue=*/false);
|
|
EmitCXXDestructorCall(D, Dtor_Base, V);
|
|
}
|
|
}
|
|
|
|
/// EmitCXXAggrConstructorCall - This routine essentially creates a (nested)
|
|
/// for-loop to call the default constructor on individual members of the
|
|
/// array.
|
|
/// 'D' is the default constructor for elements of the array, 'ArrayTy' is the
|
|
/// array type and 'ArrayPtr' points to the beginning fo the array.
|
|
/// It is assumed that all relevant checks have been made by the caller.
|
|
void
|
|
CodeGenFunction::EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
|
|
const ConstantArrayType *ArrayTy,
|
|
llvm::Value *ArrayPtr,
|
|
CallExpr::const_arg_iterator ArgBeg,
|
|
CallExpr::const_arg_iterator ArgEnd) {
|
|
|
|
const llvm::Type *SizeTy = ConvertType(getContext().getSizeType());
|
|
llvm::Value * NumElements =
|
|
llvm::ConstantInt::get(SizeTy,
|
|
getContext().getConstantArrayElementCount(ArrayTy));
|
|
|
|
EmitCXXAggrConstructorCall(D, NumElements, ArrayPtr, ArgBeg, ArgEnd);
|
|
}
|
|
|
|
void
|
|
CodeGenFunction::EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
|
|
llvm::Value *NumElements,
|
|
llvm::Value *ArrayPtr,
|
|
CallExpr::const_arg_iterator ArgBeg,
|
|
CallExpr::const_arg_iterator ArgEnd) {
|
|
const llvm::Type *SizeTy = ConvertType(getContext().getSizeType());
|
|
|
|
// Create a temporary for the loop index and initialize it with 0.
|
|
llvm::Value *IndexPtr = CreateTempAlloca(SizeTy, "loop.index");
|
|
llvm::Value *Zero = llvm::Constant::getNullValue(SizeTy);
|
|
Builder.CreateStore(Zero, IndexPtr);
|
|
|
|
// Start the loop with a block that tests the condition.
|
|
llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
|
|
llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
|
|
|
|
EmitBlock(CondBlock);
|
|
|
|
llvm::BasicBlock *ForBody = createBasicBlock("for.body");
|
|
|
|
// Generate: if (loop-index < number-of-elements fall to the loop body,
|
|
// otherwise, go to the block after the for-loop.
|
|
llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
|
|
llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElements, "isless");
|
|
// If the condition is true, execute the body.
|
|
Builder.CreateCondBr(IsLess, ForBody, AfterFor);
|
|
|
|
EmitBlock(ForBody);
|
|
|
|
llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
|
|
// Inside the loop body, emit the constructor call on the array element.
|
|
Counter = Builder.CreateLoad(IndexPtr);
|
|
llvm::Value *Address = Builder.CreateInBoundsGEP(ArrayPtr, Counter,
|
|
"arrayidx");
|
|
|
|
// C++ [class.temporary]p4:
|
|
// There are two contexts in which temporaries are destroyed at a different
|
|
// point than the end of the full-expression. The first context is when a
|
|
// default constructor is called to initialize an element of an array.
|
|
// If the constructor has one or more default arguments, the destruction of
|
|
// every temporary created in a default argument expression is sequenced
|
|
// before the construction of the next array element, if any.
|
|
|
|
// Keep track of the current number of live temporaries.
|
|
unsigned OldNumLiveTemporaries = LiveTemporaries.size();
|
|
|
|
EmitCXXConstructorCall(D, Ctor_Complete, Address, ArgBeg, ArgEnd);
|
|
|
|
// Pop temporaries.
|
|
while (LiveTemporaries.size() > OldNumLiveTemporaries)
|
|
PopCXXTemporary();
|
|
|
|
EmitBlock(ContinueBlock);
|
|
|
|
// Emit the increment of the loop counter.
|
|
llvm::Value *NextVal = llvm::ConstantInt::get(SizeTy, 1);
|
|
Counter = Builder.CreateLoad(IndexPtr);
|
|
NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
|
|
Builder.CreateStore(NextVal, IndexPtr);
|
|
|
|
// Finally, branch back up to the condition for the next iteration.
|
|
EmitBranch(CondBlock);
|
|
|
|
// Emit the fall-through block.
|
|
EmitBlock(AfterFor, true);
|
|
}
|
|
|
|
/// EmitCXXAggrDestructorCall - calls the default destructor on array
|
|
/// elements in reverse order of construction.
|
|
void
|
|
CodeGenFunction::EmitCXXAggrDestructorCall(const CXXDestructorDecl *D,
|
|
const ArrayType *Array,
|
|
llvm::Value *This) {
|
|
const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
|
|
assert(CA && "Do we support VLA for destruction ?");
|
|
uint64_t ElementCount = getContext().getConstantArrayElementCount(CA);
|
|
|
|
const llvm::Type *SizeLTy = ConvertType(getContext().getSizeType());
|
|
llvm::Value* ElementCountPtr = llvm::ConstantInt::get(SizeLTy, ElementCount);
|
|
EmitCXXAggrDestructorCall(D, ElementCountPtr, This);
|
|
}
|
|
|
|
/// EmitCXXAggrDestructorCall - calls the default destructor on array
|
|
/// elements in reverse order of construction.
|
|
void
|
|
CodeGenFunction::EmitCXXAggrDestructorCall(const CXXDestructorDecl *D,
|
|
llvm::Value *UpperCount,
|
|
llvm::Value *This) {
|
|
const llvm::Type *SizeLTy = ConvertType(getContext().getSizeType());
|
|
llvm::Value *One = llvm::ConstantInt::get(SizeLTy, 1);
|
|
|
|
// Create a temporary for the loop index and initialize it with count of
|
|
// array elements.
|
|
llvm::Value *IndexPtr = CreateTempAlloca(SizeLTy, "loop.index");
|
|
|
|
// Store the number of elements in the index pointer.
|
|
Builder.CreateStore(UpperCount, IndexPtr);
|
|
|
|
// Start the loop with a block that tests the condition.
|
|
llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
|
|
llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
|
|
|
|
EmitBlock(CondBlock);
|
|
|
|
llvm::BasicBlock *ForBody = createBasicBlock("for.body");
|
|
|
|
// Generate: if (loop-index != 0 fall to the loop body,
|
|
// otherwise, go to the block after the for-loop.
|
|
llvm::Value* zeroConstant =
|
|
llvm::Constant::getNullValue(SizeLTy);
|
|
llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
|
|
llvm::Value *IsNE = Builder.CreateICmpNE(Counter, zeroConstant,
|
|
"isne");
|
|
// If the condition is true, execute the body.
|
|
Builder.CreateCondBr(IsNE, ForBody, AfterFor);
|
|
|
|
EmitBlock(ForBody);
|
|
|
|
llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
|
|
// Inside the loop body, emit the constructor call on the array element.
|
|
Counter = Builder.CreateLoad(IndexPtr);
|
|
Counter = Builder.CreateSub(Counter, One);
|
|
llvm::Value *Address = Builder.CreateInBoundsGEP(This, Counter, "arrayidx");
|
|
EmitCXXDestructorCall(D, Dtor_Complete, Address);
|
|
|
|
EmitBlock(ContinueBlock);
|
|
|
|
// Emit the decrement of the loop counter.
|
|
Counter = Builder.CreateLoad(IndexPtr);
|
|
Counter = Builder.CreateSub(Counter, One, "dec");
|
|
Builder.CreateStore(Counter, IndexPtr);
|
|
|
|
// Finally, branch back up to the condition for the next iteration.
|
|
EmitBranch(CondBlock);
|
|
|
|
// Emit the fall-through block.
|
|
EmitBlock(AfterFor, true);
|
|
}
|
|
|
|
/// GenerateCXXAggrDestructorHelper - Generates a helper function which when
|
|
/// invoked, calls the default destructor on array elements in reverse order of
|
|
/// construction.
|
|
llvm::Constant *
|
|
CodeGenFunction::GenerateCXXAggrDestructorHelper(const CXXDestructorDecl *D,
|
|
const ArrayType *Array,
|
|
llvm::Value *This) {
|
|
FunctionArgList Args;
|
|
ImplicitParamDecl *Dst =
|
|
ImplicitParamDecl::Create(getContext(), 0,
|
|
SourceLocation(), 0,
|
|
getContext().getPointerType(getContext().VoidTy));
|
|
Args.push_back(std::make_pair(Dst, Dst->getType()));
|
|
|
|
llvm::SmallString<16> Name;
|
|
llvm::raw_svector_ostream(Name) << "__tcf_" << (++UniqueAggrDestructorCount);
|
|
QualType R = getContext().VoidTy;
|
|
const CGFunctionInfo &FI
|
|
= CGM.getTypes().getFunctionInfo(R, Args, CC_Default, false);
|
|
const llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI, false);
|
|
llvm::Function *Fn =
|
|
llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
|
|
Name.str(),
|
|
&CGM.getModule());
|
|
IdentifierInfo *II = &CGM.getContext().Idents.get(Name.str());
|
|
FunctionDecl *FD = FunctionDecl::Create(getContext(),
|
|
getContext().getTranslationUnitDecl(),
|
|
SourceLocation(), II, R, 0,
|
|
FunctionDecl::Static,
|
|
false, true);
|
|
StartFunction(FD, R, Fn, Args, SourceLocation());
|
|
QualType BaseElementTy = getContext().getBaseElementType(Array);
|
|
const llvm::Type *BasePtr = ConvertType(BaseElementTy);
|
|
BasePtr = llvm::PointerType::getUnqual(BasePtr);
|
|
llvm::Value *BaseAddrPtr = Builder.CreateBitCast(This, BasePtr);
|
|
EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr);
|
|
FinishFunction();
|
|
llvm::Type *Ptr8Ty = llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext),
|
|
0);
|
|
llvm::Constant *m = llvm::ConstantExpr::getBitCast(Fn, Ptr8Ty);
|
|
return m;
|
|
}
|
|
|
|
|
|
void
|
|
CodeGenFunction::EmitCXXConstructorCall(const CXXConstructorDecl *D,
|
|
CXXCtorType Type,
|
|
llvm::Value *This,
|
|
CallExpr::const_arg_iterator ArgBeg,
|
|
CallExpr::const_arg_iterator ArgEnd) {
|
|
if (D->isTrivial()) {
|
|
if (ArgBeg == ArgEnd) {
|
|
// Trivial default constructor, no codegen required.
|
|
assert(D->isDefaultConstructor() &&
|
|
"trivial 0-arg ctor not a default ctor");
|
|
return;
|
|
}
|
|
|
|
assert(ArgBeg + 1 == ArgEnd && "unexpected argcount for trivial ctor");
|
|
assert(D->isCopyConstructor() && "trivial 1-arg ctor not a copy ctor");
|
|
|
|
const Expr *E = (*ArgBeg);
|
|
QualType Ty = E->getType();
|
|
llvm::Value *Src = EmitLValue(E).getAddress();
|
|
EmitAggregateCopy(This, Src, Ty);
|
|
return;
|
|
}
|
|
|
|
llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(D, Type));
|
|
llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(D, Type);
|
|
|
|
EmitCXXMemberCall(D, Callee, ReturnValueSlot(), This, VTT, ArgBeg, ArgEnd);
|
|
}
|
|
|
|
void
|
|
CodeGenFunction::EmitDelegateCXXConstructorCall(const CXXConstructorDecl *Ctor,
|
|
CXXCtorType CtorType,
|
|
const FunctionArgList &Args) {
|
|
CallArgList DelegateArgs;
|
|
|
|
FunctionArgList::const_iterator I = Args.begin(), E = Args.end();
|
|
assert(I != E && "no parameters to constructor");
|
|
|
|
// this
|
|
DelegateArgs.push_back(std::make_pair(RValue::get(LoadCXXThis()),
|
|
I->second));
|
|
++I;
|
|
|
|
// vtt
|
|
if (llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(Ctor, CtorType))) {
|
|
QualType VoidPP = getContext().getPointerType(getContext().VoidPtrTy);
|
|
DelegateArgs.push_back(std::make_pair(RValue::get(VTT), VoidPP));
|
|
|
|
if (CGVtableInfo::needsVTTParameter(CurGD)) {
|
|
assert(I != E && "cannot skip vtt parameter, already done with args");
|
|
assert(I->second == VoidPP && "skipping parameter not of vtt type");
|
|
++I;
|
|
}
|
|
}
|
|
|
|
// Explicit arguments.
|
|
for (; I != E; ++I) {
|
|
|
|
const VarDecl *Param = I->first;
|
|
QualType ArgType = Param->getType(); // because we're passing it to itself
|
|
|
|
// StartFunction converted the ABI-lowered parameter(s) into a
|
|
// local alloca. We need to turn that into an r-value suitable
|
|
// for EmitCall.
|
|
llvm::Value *Local = GetAddrOfLocalVar(Param);
|
|
RValue Arg;
|
|
|
|
// For the most part, we just need to load the alloca, except:
|
|
// 1) aggregate r-values are actually pointers to temporaries, and
|
|
// 2) references to aggregates are pointers directly to the aggregate.
|
|
// I don't know why references to non-aggregates are different here.
|
|
if (ArgType->isReferenceType()) {
|
|
const ReferenceType *RefType = ArgType->getAs<ReferenceType>();
|
|
if (hasAggregateLLVMType(RefType->getPointeeType()))
|
|
Arg = RValue::getAggregate(Local);
|
|
else
|
|
// Locals which are references to scalars are represented
|
|
// with allocas holding the pointer.
|
|
Arg = RValue::get(Builder.CreateLoad(Local));
|
|
} else {
|
|
if (hasAggregateLLVMType(ArgType))
|
|
Arg = RValue::getAggregate(Local);
|
|
else
|
|
Arg = RValue::get(EmitLoadOfScalar(Local, false, ArgType));
|
|
}
|
|
|
|
DelegateArgs.push_back(std::make_pair(Arg, ArgType));
|
|
}
|
|
|
|
EmitCall(CGM.getTypes().getFunctionInfo(Ctor, CtorType),
|
|
CGM.GetAddrOfCXXConstructor(Ctor, CtorType),
|
|
ReturnValueSlot(), DelegateArgs, Ctor);
|
|
}
|
|
|
|
void CodeGenFunction::EmitCXXDestructorCall(const CXXDestructorDecl *DD,
|
|
CXXDtorType Type,
|
|
llvm::Value *This) {
|
|
llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(DD, Type));
|
|
llvm::Value *Callee = CGM.GetAddrOfCXXDestructor(DD, Type);
|
|
|
|
EmitCXXMemberCall(DD, Callee, ReturnValueSlot(), This, VTT, 0, 0);
|
|
}
|
|
|
|
llvm::Value *
|
|
CodeGenFunction::GetVirtualBaseClassOffset(llvm::Value *This,
|
|
const CXXRecordDecl *ClassDecl,
|
|
const CXXRecordDecl *BaseClassDecl) {
|
|
const llvm::Type *Int8PtrTy =
|
|
llvm::Type::getInt8Ty(VMContext)->getPointerTo();
|
|
|
|
llvm::Value *VTablePtr = Builder.CreateBitCast(This,
|
|
Int8PtrTy->getPointerTo());
|
|
VTablePtr = Builder.CreateLoad(VTablePtr, "vtable");
|
|
|
|
int64_t VBaseOffsetOffset =
|
|
CGM.getVtableInfo().getVirtualBaseOffsetOffset(ClassDecl, BaseClassDecl);
|
|
|
|
llvm::Value *VBaseOffsetPtr =
|
|
Builder.CreateConstGEP1_64(VTablePtr, VBaseOffsetOffset, "vbase.offset.ptr");
|
|
const llvm::Type *PtrDiffTy =
|
|
ConvertType(getContext().getPointerDiffType());
|
|
|
|
VBaseOffsetPtr = Builder.CreateBitCast(VBaseOffsetPtr,
|
|
PtrDiffTy->getPointerTo());
|
|
|
|
llvm::Value *VBaseOffset = Builder.CreateLoad(VBaseOffsetPtr, "vbase.offset");
|
|
|
|
return VBaseOffset;
|
|
}
|
|
|
|
void CodeGenFunction::InitializeVtablePtrs(const CXXRecordDecl *ClassDecl) {
|
|
if (!ClassDecl->isDynamicClass())
|
|
return;
|
|
|
|
llvm::Constant *Vtable = CGM.getVtableInfo().getVtable(ClassDecl);
|
|
CGVtableInfo::AddrSubMap_t& AddressPoints =
|
|
*(*CGM.getVtableInfo().AddressPoints[ClassDecl])[ClassDecl];
|
|
llvm::Value *ThisPtr = LoadCXXThis();
|
|
const ASTRecordLayout &Layout = getContext().getASTRecordLayout(ClassDecl);
|
|
|
|
// Store address points for virtual bases
|
|
for (CXXRecordDecl::base_class_const_iterator I =
|
|
ClassDecl->vbases_begin(), E = ClassDecl->vbases_end(); I != E; ++I) {
|
|
const CXXBaseSpecifier &Base = *I;
|
|
CXXRecordDecl *BaseClassDecl
|
|
= cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
|
|
uint64_t Offset = Layout.getVBaseClassOffset(BaseClassDecl);
|
|
InitializeVtablePtrsRecursive(BaseClassDecl, Vtable, AddressPoints,
|
|
ThisPtr, Offset);
|
|
}
|
|
|
|
// Store address points for non-virtual bases and current class
|
|
InitializeVtablePtrsRecursive(ClassDecl, Vtable, AddressPoints, ThisPtr, 0);
|
|
}
|
|
|
|
void CodeGenFunction::InitializeVtablePtrsRecursive(
|
|
const CXXRecordDecl *ClassDecl,
|
|
llvm::Constant *Vtable,
|
|
CGVtableInfo::AddrSubMap_t& AddressPoints,
|
|
llvm::Value *ThisPtr,
|
|
uint64_t Offset) {
|
|
if (!ClassDecl->isDynamicClass())
|
|
return;
|
|
|
|
// Store address points for non-virtual bases
|
|
const ASTRecordLayout &Layout = getContext().getASTRecordLayout(ClassDecl);
|
|
for (CXXRecordDecl::base_class_const_iterator I =
|
|
ClassDecl->bases_begin(), E = ClassDecl->bases_end(); I != E; ++I) {
|
|
const CXXBaseSpecifier &Base = *I;
|
|
if (Base.isVirtual())
|
|
continue;
|
|
CXXRecordDecl *BaseClassDecl
|
|
= cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
|
|
uint64_t NewOffset = Offset + Layout.getBaseClassOffset(BaseClassDecl);
|
|
InitializeVtablePtrsRecursive(BaseClassDecl, Vtable, AddressPoints,
|
|
ThisPtr, NewOffset);
|
|
}
|
|
|
|
// Compute the address point
|
|
assert(AddressPoints.count(std::make_pair(ClassDecl, Offset)) &&
|
|
"Missing address point for class");
|
|
uint64_t AddressPoint = AddressPoints[std::make_pair(ClassDecl, Offset)];
|
|
llvm::Value *VtableAddressPoint =
|
|
Builder.CreateConstInBoundsGEP2_64(Vtable, 0, AddressPoint);
|
|
|
|
// Compute the address to store the address point
|
|
const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext());
|
|
llvm::Value *VtableField = Builder.CreateBitCast(ThisPtr, Int8PtrTy);
|
|
VtableField = Builder.CreateConstInBoundsGEP1_64(VtableField, Offset/8);
|
|
const llvm::Type *AddressPointPtrTy =
|
|
VtableAddressPoint->getType()->getPointerTo();
|
|
VtableField = Builder.CreateBitCast(VtableField, AddressPointPtrTy);
|
|
|
|
// Store address point
|
|
Builder.CreateStore(VtableAddressPoint, VtableField);
|
|
}
|