RecordLayout.cpp
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//===- RecordLayout.cpp - Layout information for a struct/union -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the RecordLayout interface.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/RecordLayout.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/TargetCXXABI.h"
#include "clang/Basic/TargetInfo.h"
#include <cassert>
using namespace clang;
void ASTRecordLayout::Destroy(ASTContext &Ctx) {
if (CXXInfo) {
CXXInfo->~CXXRecordLayoutInfo();
Ctx.Deallocate(CXXInfo);
}
this->~ASTRecordLayout();
Ctx.Deallocate(this);
}
ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
CharUnits alignment,
CharUnits preferredAlignment,
CharUnits unadjustedAlignment,
CharUnits requiredAlignment,
CharUnits datasize,
ArrayRef<uint64_t> fieldoffsets)
: Size(size), DataSize(datasize), Alignment(alignment),
PreferredAlignment(preferredAlignment),
UnadjustedAlignment(unadjustedAlignment),
RequiredAlignment(requiredAlignment) {
FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
}
// Constructor for C++ records.
ASTRecordLayout::ASTRecordLayout(
const ASTContext &Ctx, CharUnits size, CharUnits alignment,
CharUnits preferredAlignment, CharUnits unadjustedAlignment,
CharUnits requiredAlignment, bool hasOwnVFPtr, bool hasExtendableVFPtr,
CharUnits vbptroffset, CharUnits datasize, ArrayRef<uint64_t> fieldoffsets,
CharUnits nonvirtualsize, CharUnits nonvirtualalignment,
CharUnits preferrednvalignment, CharUnits SizeOfLargestEmptySubobject,
const CXXRecordDecl *PrimaryBase, bool IsPrimaryBaseVirtual,
const CXXRecordDecl *BaseSharingVBPtr, bool EndsWithZeroSizedObject,
bool LeadsWithZeroSizedBase, const BaseOffsetsMapTy &BaseOffsets,
const VBaseOffsetsMapTy &VBaseOffsets)
: Size(size), DataSize(datasize), Alignment(alignment),
PreferredAlignment(preferredAlignment),
UnadjustedAlignment(unadjustedAlignment),
RequiredAlignment(requiredAlignment),
CXXInfo(new (Ctx) CXXRecordLayoutInfo) {
FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
CXXInfo->PrimaryBase.setPointer(PrimaryBase);
CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
CXXInfo->NonVirtualSize = nonvirtualsize;
CXXInfo->NonVirtualAlignment = nonvirtualalignment;
CXXInfo->PreferredNVAlignment = preferrednvalignment;
CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
CXXInfo->BaseOffsets = BaseOffsets;
CXXInfo->VBaseOffsets = VBaseOffsets;
CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
CXXInfo->VBPtrOffset = vbptroffset;
CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
CXXInfo->EndsWithZeroSizedObject = EndsWithZeroSizedObject;
CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase;
#ifndef NDEBUG
if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
if (isPrimaryBaseVirtual()) {
if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
assert(getVBaseClassOffset(PrimaryBase).isZero() &&
"Primary virtual base must be at offset 0!");
}
} else {
assert(getBaseClassOffset(PrimaryBase).isZero() &&
"Primary base must be at offset 0!");
}
}
#endif
}