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95 lines
4.0 KiB
C++
95 lines
4.0 KiB
C++
//===- RecordLayout.cpp - Layout information for a struct/union -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/RecordLayout.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/Basic/TargetCXXABI.h"
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#include "clang/Basic/TargetInfo.h"
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#include <cassert>
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using namespace clang;
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void ASTRecordLayout::Destroy(ASTContext &Ctx) {
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if (CXXInfo) {
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CXXInfo->~CXXRecordLayoutInfo();
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Ctx.Deallocate(CXXInfo);
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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 unadjustedAlignment,
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CharUnits requiredAlignment,
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CharUnits datasize,
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ArrayRef<uint64_t> fieldoffsets)
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: Size(size), DataSize(datasize), Alignment(alignment),
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UnadjustedAlignment(unadjustedAlignment),
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RequiredAlignment(requiredAlignment) {
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FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
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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 unadjustedAlignment,
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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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ArrayRef<uint64_t> fieldoffsets,
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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 EndsWithZeroSizedObject,
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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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UnadjustedAlignment(unadjustedAlignment),
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RequiredAlignment(requiredAlignment), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
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{
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FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
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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->EndsWithZeroSizedObject = EndsWithZeroSizedObject;
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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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