forked from OSchip/llvm-project
1431 lines
58 KiB
C++
1431 lines
58 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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using namespace clang;
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using namespace CodeGen;
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static uint64_t
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ComputeNonVirtualBaseClassOffset(ASTContext &Context, CXXBasePaths &Paths,
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unsigned Start) {
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uint64_t Offset = 0;
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const CXXBasePath &Path = Paths.front();
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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::GetCXXBaseClassOffset(const CXXRecordDecl *ClassDecl,
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const CXXRecordDecl *BaseClassDecl) {
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if (ClassDecl == BaseClassDecl)
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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 *>(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 0;
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}
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uint64_t Offset = ComputeNonVirtualBaseClassOffset(getContext(), Paths, 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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static llvm::Value *GetCXXBaseClassOffset(CodeGenFunction &CGF,
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llvm::Value *BaseValue,
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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 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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if (VBase)
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VirtualOffset =
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CGF.GetVirtualCXXBaseClassOffset(BaseValue, ClassDecl, VBase);
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uint64_t Offset =
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ComputeNonVirtualBaseClassOffset(CGF.getContext(), Paths, Start);
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if (!Offset)
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return VirtualOffset;
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const llvm::Type *PtrDiffTy =
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CGF.ConvertType(CGF.getContext().getPointerDiffType());
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llvm::Value *NonVirtualOffset = llvm::ConstantInt::get(PtrDiffTy, Offset);
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if (VirtualOffset)
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return CGF.Builder.CreateAdd(VirtualOffset, NonVirtualOffset);
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return NonVirtualOffset;
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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().getVirtualBaseOffsetIndex(ClassDecl, BaseClassDecl);
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uint64_t Offset =
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ComputeNonVirtualBaseClassOffset(getContext(), Paths, Start);
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return ThunkAdjustment(Offset, VirtualOffset);
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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 *ClassDecl,
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const CXXRecordDecl *BaseClassDecl,
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bool NullCheckValue) {
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QualType BTy =
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getContext().getCanonicalType(
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getContext().getTypeDeclType(const_cast<CXXRecordDecl*>(BaseClassDecl)));
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const llvm::Type *BasePtrTy = llvm::PointerType::getUnqual(ConvertType(BTy));
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if (ClassDecl == BaseClassDecl) {
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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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const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
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llvm::Value *Offset =
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GetCXXBaseClassOffset(*this, Value, ClassDecl, BaseClassDecl);
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if (Offset) {
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// Apply the offset.
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Value = Builder.CreateBitCast(Value, Int8PtrTy);
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Value = Builder.CreateGEP(Value, Offset, "add.ptr");
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}
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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 *ClassDecl,
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const CXXRecordDecl *DerivedClassDecl,
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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*>(DerivedClassDecl)));
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const llvm::Type *DerivedPtrTy = ConvertType(DerivedTy)->getPointerTo();
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if (ClassDecl == DerivedClassDecl) {
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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::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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llvm::Value *Offset = GetCXXBaseClassOffset(*this, Value, DerivedClassDecl,
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ClassDecl);
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if (Offset) {
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// Apply the offset.
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Value = Builder.CreatePtrToInt(Value, Offset->getType());
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Value = Builder.CreateSub(Value, Offset);
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Value = Builder.CreateIntToPtr(Value, DerivedPtrTy);
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} else {
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// Just cast.
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Value = Builder.CreateBitCast(Value, DerivedPtrTy);
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}
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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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QualType ResultType =
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BaseCopyCtor->getType()->getAs<FunctionType>()->getResultType();
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EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
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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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QualType ResultType = MD->getType()->getAs<FunctionType>()->getResultType();
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EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
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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();
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const CXXRecordDecl *Base = cast<CXXMethodDecl>(GD.getDecl())->getParent();
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llvm::Value *VTT;
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uint64_t SubVTTIndex =
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CGF.CGM.getVtableInfo().getSubVTTIndex(RD, Base);
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assert(SubVTTIndex != 0 && "Sub-VTT index must be greater than zero!");
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if (CGVtableInfo::needsVTTParameter(CGF.CurGD)) {
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// A VTT parameter was passed to the constructor, use it.
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VTT = CGF.LoadCXXVTT();
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VTT = CGF.Builder.CreateConstInBoundsGEP1_64(VTT, SubVTTIndex);
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} else {
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// We're the complete constructor, so get the VTT by name.
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VTT = CGF.CGM.getVtableInfo().getVTT(RD);
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VTT = CGF.Builder.CreateConstInBoundsGEP2_64(VTT, 0, SubVTTIndex);
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}
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return VTT;
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}
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/// EmitClassMemberwiseCopy - This routine generates code to copy a class
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/// object from SrcValue to DestValue. Copying can be either a bitwise copy
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/// or via a copy constructor call.
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void CodeGenFunction::EmitClassMemberwiseCopy(
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llvm::Value *Dest, llvm::Value *Src,
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const CXXRecordDecl *ClassDecl,
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const CXXRecordDecl *BaseClassDecl, QualType Ty) {
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CXXCtorType CtorType = Ctor_Complete;
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if (ClassDecl) {
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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()));
|
|
QualType ResultType =
|
|
BaseCopyCtor->getType()->getAs<FunctionType>()->getResultType();
|
|
EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
|
|
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));
|
|
QualType ResultType =
|
|
MD->getType()->getAs<FunctionType>()->getResultType();
|
|
EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
|
|
Callee, ReturnValueSlot(), CallArgs, MD);
|
|
}
|
|
|
|
/// SynthesizeDefaultConstructor - synthesize a default constructor
|
|
void
|
|
CodeGenFunction::SynthesizeDefaultConstructor(const CXXConstructorDecl *Ctor,
|
|
CXXCtorType Type,
|
|
llvm::Function *Fn,
|
|
const FunctionArgList &Args) {
|
|
assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
|
|
StartFunction(GlobalDecl(Ctor, Type), Ctor->getResultType(), Fn, Args,
|
|
SourceLocation());
|
|
EmitCtorPrologue(Ctor, Type);
|
|
FinishFunction();
|
|
}
|
|
|
|
/// 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 CXXConstructorDecl *Ctor,
|
|
CXXCtorType Type,
|
|
llvm::Function *Fn,
|
|
const FunctionArgList &Args) {
|
|
const CXXRecordDecl *ClassDecl = Ctor->getParent();
|
|
assert(!ClassDecl->hasUserDeclaredCopyConstructor() &&
|
|
"SynthesizeCXXCopyConstructor - copy constructor has definition already");
|
|
assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
|
|
StartFunction(GlobalDecl(Ctor, Type), Ctor->getResultType(), Fn, Args,
|
|
SourceLocation());
|
|
|
|
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, false, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, Field, false, 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;
|
|
}
|
|
|
|
if (Field->getType()->isReferenceType()) {
|
|
unsigned FieldIndex = CGM.getTypes().getLLVMFieldNo(Field);
|
|
|
|
llvm::Value *LHS = Builder.CreateStructGEP(LoadOfThis, FieldIndex,
|
|
"lhs.ref");
|
|
|
|
llvm::Value *RHS = Builder.CreateStructGEP(LoadOfThis, FieldIndex,
|
|
"rhs.ref");
|
|
|
|
// Load the value in RHS.
|
|
RHS = Builder.CreateLoad(RHS);
|
|
|
|
// And store it in the LHS
|
|
Builder.CreateStore(RHS, LHS);
|
|
|
|
continue;
|
|
}
|
|
// Do a built-in assignment of scalar data members.
|
|
LValue LHS = EmitLValueForField(LoadOfThis, Field, false, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, Field, false, 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);
|
|
FinishFunction();
|
|
}
|
|
|
|
/// 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 CXXMethodDecl *CD,
|
|
llvm::Function *Fn,
|
|
const FunctionArgList &Args) {
|
|
|
|
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(CD->getDeclContext());
|
|
assert(!ClassDecl->hasUserDeclaredCopyAssignment() &&
|
|
"SynthesizeCXXCopyAssignment - copy assignment has user declaration");
|
|
StartFunction(CD, CD->getResultType(), Fn, Args, SourceLocation());
|
|
|
|
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, false, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, *Field, false, 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, false, 0);
|
|
LValue RHS = EmitLValueForField(LoadOfSrc, *Field, false, 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);
|
|
|
|
FinishFunction();
|
|
}
|
|
|
|
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;
|
|
|
|
// Compute the offset to the base; we do this directly instead of using
|
|
// GetAddressOfBaseClass because the class doesn't have a vtable pointer
|
|
// at this point.
|
|
// FIXME: This could be refactored back into GetAddressOfBaseClass if it took
|
|
// an extra parameter for whether the derived class is the complete object
|
|
// class.
|
|
const ASTRecordLayout &Layout =
|
|
CGF.getContext().getASTRecordLayout(ClassDecl);
|
|
uint64_t Offset;
|
|
if (isBaseVirtual)
|
|
Offset = Layout.getVBaseClassOffset(BaseClassDecl);
|
|
else
|
|
Offset = Layout.getBaseClassOffset(BaseClassDecl);
|
|
const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext());
|
|
const llvm::Type *BaseClassType = CGF.ConvertType(QualType(BaseType, 0));
|
|
llvm::Value *V = CGF.Builder.CreateBitCast(ThisPtr, Int8PtrTy);
|
|
V = CGF.Builder.CreateConstInBoundsGEP1_64(V, Offset/8);
|
|
V = CGF.Builder.CreateBitCast(V, BaseClassType->getPointerTo());
|
|
|
|
CGF.EmitCXXConstructorCall(BaseInit->getConstructor(),
|
|
Ctor_Base, V,
|
|
BaseInit->const_arg_begin(),
|
|
BaseInit->const_arg_end());
|
|
}
|
|
|
|
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;
|
|
if (FieldType->isReferenceType()) {
|
|
// FIXME: This is really ugly; should be refactored somehow
|
|
unsigned idx = CGF.CGM.getTypes().getLLVMFieldNo(Field);
|
|
llvm::Value *V = CGF.Builder.CreateStructGEP(ThisPtr, idx, "tmp");
|
|
assert(!FieldType.getObjCGCAttr() && "fields cannot have GC attrs");
|
|
LHS = LValue::MakeAddr(V, CGF.MakeQualifiers(FieldType));
|
|
} else {
|
|
LHS = CGF.EmitLValueForField(ThisPtr, Field, ClassDecl->isUnion(), 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,
|
|
/*IsUnion=*/true, 0);
|
|
FieldType = Field->getType();
|
|
}
|
|
|
|
// If the field is an array, branch based on the element type.
|
|
const ConstantArrayType *Array =
|
|
CGF.getContext().getAsConstantArrayType(FieldType);
|
|
if (Array)
|
|
FieldType = CGF.getContext().getBaseElementType(FieldType);
|
|
|
|
// We lose the constructor for anonymous union members, so handle them
|
|
// explicitly.
|
|
// FIXME: This is somwhat ugly.
|
|
if (MemberInit->getAnonUnionMember() && FieldType->getAs<RecordType>()) {
|
|
if (MemberInit->getNumArgs())
|
|
CGF.EmitAggExpr(*MemberInit->arg_begin(), LHS.getAddress(),
|
|
LHS.isVolatileQualified());
|
|
else
|
|
CGF.EmitAggregateClear(LHS.getAddress(), Field->getType());
|
|
return;
|
|
}
|
|
|
|
if (FieldType->getAs<RecordType>()) {
|
|
assert(MemberInit->getConstructor() &&
|
|
"EmitCtorPrologue - no constructor to initialize member");
|
|
if (Array) {
|
|
const llvm::Type *BasePtr = CGF.ConvertType(FieldType);
|
|
BasePtr = llvm::PointerType::getUnqual(BasePtr);
|
|
llvm::Value *BaseAddrPtr =
|
|
CGF.Builder.CreateBitCast(LHS.getAddress(), BasePtr);
|
|
CGF.EmitCXXAggrConstructorCall(MemberInit->getConstructor(),
|
|
Array, BaseAddrPtr,
|
|
MemberInit->const_arg_begin(),
|
|
MemberInit->const_arg_end());
|
|
}
|
|
else
|
|
CGF.EmitCXXConstructorCall(MemberInit->getConstructor(),
|
|
Ctor_Complete, LHS.getAddress(),
|
|
MemberInit->const_arg_begin(),
|
|
MemberInit->const_arg_end());
|
|
return;
|
|
}
|
|
|
|
assert(MemberInit->getNumArgs() == 1 && "Initializer count must be 1 only");
|
|
Expr *RhsExpr = *MemberInit->arg_begin();
|
|
RValue RHS;
|
|
if (FieldType->isReferenceType()) {
|
|
RHS = CGF.EmitReferenceBindingToExpr(RhsExpr, FieldType,
|
|
/*IsInitializer=*/true);
|
|
CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
|
|
} else if (Array) {
|
|
CGF.EmitMemSetToZero(LHS.getAddress(), Field->getType());
|
|
} else if (!CGF.hasAggregateLLVMType(RhsExpr->getType())) {
|
|
RHS = RValue::get(CGF.EmitScalarExpr(RhsExpr, true));
|
|
CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
|
|
} else if (RhsExpr->getType()->isAnyComplexType()) {
|
|
CGF.EmitComplexExprIntoAddr(RhsExpr, LHS.getAddress(),
|
|
LHS.isVolatileQualified());
|
|
} else {
|
|
// Handle member function pointers; other aggregates shouldn't get this far.
|
|
CGF.EmitAggExpr(RhsExpr, LHS.getAddress(), LHS.isVolatileQualified());
|
|
}
|
|
}
|
|
|
|
/// EmitCtorPrologue - This routine generates necessary code to initialize
|
|
/// base classes and non-static data members belonging to this constructor.
|
|
/// FIXME: This needs to take a CXXCtorType.
|
|
void CodeGenFunction::EmitCtorPrologue(const CXXConstructorDecl *CD,
|
|
CXXCtorType CtorType) {
|
|
const CXXRecordDecl *ClassDecl = CD->getParent();
|
|
|
|
// 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
|
|
EmitMemberInitializer(*this, ClassDecl, Member);
|
|
|
|
// Pop any live temporaries that the initializers might have pushed.
|
|
while (!LiveTemporaries.empty())
|
|
PopCXXTemporary();
|
|
}
|
|
|
|
InitializeVtablePtrs(ClassDecl);
|
|
}
|
|
|
|
/// 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.
|
|
/// FIXME: This needs to take a CXXDtorType.
|
|
void CodeGenFunction::EmitDtorEpilogue(const CXXDestructorDecl *DD,
|
|
CXXDtorType DtorType) {
|
|
assert(!DD->isTrivial() &&
|
|
"Should not emit dtor epilogue for trivial dtor!");
|
|
|
|
const CXXRecordDecl *ClassDecl = DD->getParent();
|
|
|
|
// 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,
|
|
/*isUnion=*/false,
|
|
// 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);
|
|
}
|
|
|
|
// If we're emitting a base destructor, we don't want to emit calls to the
|
|
// virtual bases.
|
|
if (DtorType == Dtor_Base)
|
|
return;
|
|
|
|
// 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 = GetAddressOfBaseClass(LoadCXXThis(),
|
|
ClassDecl, BaseClassDecl,
|
|
/*NullCheckValue=*/false);
|
|
EmitCXXDestructorCall(D, Dtor_Base, V);
|
|
}
|
|
|
|
// If we have a deleting destructor, emit a call to the delete operator.
|
|
if (DtorType == Dtor_Deleting) {
|
|
assert(DD->getOperatorDelete() &&
|
|
"operator delete missing - EmitDtorEpilogue");
|
|
EmitDeleteCall(DD->getOperatorDelete(), LoadCXXThis(),
|
|
getContext().getTagDeclType(ClassDecl));
|
|
}
|
|
}
|
|
|
|
void CodeGenFunction::SynthesizeDefaultDestructor(const CXXDestructorDecl *Dtor,
|
|
CXXDtorType DtorType,
|
|
llvm::Function *Fn,
|
|
const FunctionArgList &Args) {
|
|
assert(!Dtor->getParent()->hasUserDeclaredDestructor() &&
|
|
"SynthesizeDefaultDestructor - destructor has user declaration");
|
|
|
|
StartFunction(GlobalDecl(Dtor, DtorType), Dtor->getResultType(), Fn, Args,
|
|
SourceLocation());
|
|
|
|
EmitDtorEpilogue(Dtor, DtorType);
|
|
FinishFunction();
|
|
}
|
|
|
|
/// 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);
|
|
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->isCopyConstructor()) {
|
|
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D->getDeclContext());
|
|
if (ClassDecl->hasTrivialCopyConstructor()) {
|
|
assert(!ClassDecl->hasUserDeclaredCopyConstructor() &&
|
|
"EmitCXXConstructorCall - user declared copy constructor");
|
|
const Expr *E = (*ArgBeg);
|
|
QualType Ty = E->getType();
|
|
llvm::Value *Src = EmitLValue(E).getAddress();
|
|
EmitAggregateCopy(This, Src, Ty);
|
|
return;
|
|
}
|
|
} else if (D->isTrivial()) {
|
|
// FIXME: Track down why we're trying to generate calls to the trivial
|
|
// default constructor!
|
|
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::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::GetVirtualCXXBaseClassOffset(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 VBaseOffsetIndex =
|
|
CGM.getVtableInfo().getVirtualBaseOffsetIndex(ClassDecl, BaseClassDecl);
|
|
|
|
llvm::Value *VBaseOffsetPtr =
|
|
Builder.CreateConstGEP1_64(VTablePtr, VBaseOffsetIndex, "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);
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::LoadCXXVTT() {
|
|
assert((isa<CXXConstructorDecl>(CurFuncDecl) ||
|
|
isa<CXXDestructorDecl>(CurFuncDecl)) &&
|
|
"Must be in a C++ ctor or dtor to load the vtt parameter");
|
|
|
|
return Builder.CreateLoad(LocalDeclMap[CXXVTTDecl], "vtt");
|
|
}
|