1 //===-- RecordLayout.cpp - Layout information for a struct/union -*- C++ -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the RecordLayout interface.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/RecordLayout.h"
16 #include "clang/Basic/TargetInfo.h"
18 using namespace clang;
20 void ASTRecordLayout::Destroy(ASTContext &Ctx) {
22 Ctx.Deallocate(FieldOffsets);
24 Ctx.Deallocate(CXXInfo);
25 CXXInfo->~CXXRecordLayoutInfo();
27 this->~ASTRecordLayout();
31 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
32 CharUnits alignment, CharUnits datasize,
33 const uint64_t *fieldoffsets,
35 : Size(size), DataSize(datasize), Alignment(alignment), FieldOffsets(0),
36 FieldCount(fieldcount), CXXInfo(0) {
38 FieldOffsets = new (Ctx) uint64_t[FieldCount];
39 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
43 // Constructor for C++ records.
44 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
45 CharUnits size, CharUnits alignment,
46 bool hasOwnVFPtr, bool hasExtendableVFPtr,
47 CharUnits vbptroffset,
49 const uint64_t *fieldoffsets,
51 CharUnits nonvirtualsize,
52 CharUnits nonvirtualalign,
53 CharUnits SizeOfLargestEmptySubobject,
54 const CXXRecordDecl *PrimaryBase,
55 bool IsPrimaryBaseVirtual,
56 const CXXRecordDecl *BaseSharingVBPtr,
57 bool AlignAfterVBases,
58 const BaseOffsetsMapTy& BaseOffsets,
59 const VBaseOffsetsMapTy& VBaseOffsets)
60 : Size(size), DataSize(datasize), Alignment(alignment), FieldOffsets(0),
61 FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
64 FieldOffsets = new (Ctx) uint64_t[FieldCount];
65 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
68 CXXInfo->PrimaryBase.setPointer(PrimaryBase);
69 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
70 CXXInfo->NonVirtualSize = nonvirtualsize;
71 CXXInfo->NonVirtualAlign = nonvirtualalign;
72 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
73 CXXInfo->BaseOffsets = BaseOffsets;
74 CXXInfo->VBaseOffsets = VBaseOffsets;
75 CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
76 CXXInfo->VBPtrOffset = vbptroffset;
77 CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
78 CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
79 CXXInfo->AlignAfterVBases = AlignAfterVBases;
83 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
84 if (isPrimaryBaseVirtual()) {
85 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
86 assert(getVBaseClassOffset(PrimaryBase).isZero() &&
87 "Primary virtual base must be at offset 0!");
90 assert(getBaseClassOffset(PrimaryBase).isZero() &&
91 "Primary base must be at offset 0!");