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d640d7d96e
This patch refactors microsoft record layout to be more "natural". The most dominant change is that vbptrs and vfptrs are injected after the fact. This simplifies the implementation and the math for the offest for the first base/field after the vbptr. llvm-svn: 198818
103 lines
4.1 KiB
C++
103 lines
4.1 KiB
C++
//===-- RecordLayout.cpp - Layout information for a struct/union -*- C++ -*-==//
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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 file defines the RecordLayout interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/Basic/TargetInfo.h"
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using namespace clang;
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void ASTRecordLayout::Destroy(ASTContext &Ctx) {
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if (FieldOffsets)
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Ctx.Deallocate(FieldOffsets);
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if (CXXInfo) {
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Ctx.Deallocate(CXXInfo);
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CXXInfo->~CXXRecordLayoutInfo();
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}
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this->~ASTRecordLayout();
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Ctx.Deallocate(this);
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}
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ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
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CharUnits alignment,
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CharUnits requiredAlignment,
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CharUnits datasize,
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const uint64_t *fieldoffsets,
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unsigned fieldcount)
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: Size(size), DataSize(datasize), Alignment(alignment),
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RequiredAlignment(requiredAlignment), FieldOffsets(0),
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FieldCount(fieldcount), CXXInfo(0) {
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if (FieldCount > 0) {
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FieldOffsets = new (Ctx) uint64_t[FieldCount];
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memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
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}
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}
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// Constructor for C++ records.
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ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
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CharUnits size, CharUnits alignment,
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CharUnits requiredAlignment,
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bool hasOwnVFPtr, bool hasExtendableVFPtr,
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CharUnits vbptroffset,
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CharUnits datasize,
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const uint64_t *fieldoffsets,
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unsigned fieldcount,
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CharUnits nonvirtualsize,
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CharUnits nonvirtualalignment,
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CharUnits SizeOfLargestEmptySubobject,
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const CXXRecordDecl *PrimaryBase,
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bool IsPrimaryBaseVirtual,
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const CXXRecordDecl *BaseSharingVBPtr,
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bool HasZeroSizedSubObject,
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bool LeadsWithZeroSizedBase,
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const BaseOffsetsMapTy& BaseOffsets,
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const VBaseOffsetsMapTy& VBaseOffsets)
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: Size(size), DataSize(datasize), Alignment(alignment),
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RequiredAlignment(requiredAlignment), FieldOffsets(0),
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FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
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{
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if (FieldCount > 0) {
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FieldOffsets = new (Ctx) uint64_t[FieldCount];
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memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
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}
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CXXInfo->PrimaryBase.setPointer(PrimaryBase);
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CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
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CXXInfo->NonVirtualSize = nonvirtualsize;
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CXXInfo->NonVirtualAlignment = nonvirtualalignment;
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CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
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CXXInfo->BaseOffsets = BaseOffsets;
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CXXInfo->VBaseOffsets = VBaseOffsets;
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CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
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CXXInfo->VBPtrOffset = vbptroffset;
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CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
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CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
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CXXInfo->HasZeroSizedSubObject = HasZeroSizedSubObject;
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CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase;
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#ifndef NDEBUG
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if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
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if (isPrimaryBaseVirtual()) {
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if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
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assert(getVBaseClassOffset(PrimaryBase).isZero() &&
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"Primary virtual base must be at offset 0!");
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}
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} else {
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assert(getBaseClassOffset(PrimaryBase).isZero() &&
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"Primary base must be at offset 0!");
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}
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}
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#endif
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}
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