1 //===- RecordLayout.cpp - Layout information for a struct/union -----------===//
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/RecordLayout.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/Basic/TargetCXXABI.h"
17 #include "clang/Basic/TargetInfo.h"
20 using namespace clang;
22 void ASTRecordLayout::Destroy(ASTContext &Ctx) {
24 CXXInfo->~CXXRecordLayoutInfo();
25 Ctx.Deallocate(CXXInfo);
27 this->~ASTRecordLayout();
31 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
33 CharUnits requiredAlignment,
35 ArrayRef<uint64_t> fieldoffsets)
36 : Size(size), DataSize(datasize), Alignment(alignment),
37 RequiredAlignment(requiredAlignment) {
38 FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
41 // Constructor for C++ records.
42 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
43 CharUnits size, CharUnits alignment,
44 CharUnits requiredAlignment,
45 bool hasOwnVFPtr, bool hasExtendableVFPtr,
46 CharUnits vbptroffset,
48 ArrayRef<uint64_t> fieldoffsets,
49 CharUnits nonvirtualsize,
50 CharUnits nonvirtualalignment,
51 CharUnits SizeOfLargestEmptySubobject,
52 const CXXRecordDecl *PrimaryBase,
53 bool IsPrimaryBaseVirtual,
54 const CXXRecordDecl *BaseSharingVBPtr,
55 bool EndsWithZeroSizedObject,
56 bool LeadsWithZeroSizedBase,
57 const BaseOffsetsMapTy& BaseOffsets,
58 const VBaseOffsetsMapTy& VBaseOffsets)
59 : Size(size), DataSize(datasize), Alignment(alignment),
60 RequiredAlignment(requiredAlignment), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
62 FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
64 CXXInfo->PrimaryBase.setPointer(PrimaryBase);
65 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
66 CXXInfo->NonVirtualSize = nonvirtualsize;
67 CXXInfo->NonVirtualAlignment = nonvirtualalignment;
68 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
69 CXXInfo->BaseOffsets = BaseOffsets;
70 CXXInfo->VBaseOffsets = VBaseOffsets;
71 CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
72 CXXInfo->VBPtrOffset = vbptroffset;
73 CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
74 CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
75 CXXInfo->EndsWithZeroSizedObject = EndsWithZeroSizedObject;
76 CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase;
79 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
80 if (isPrimaryBaseVirtual()) {
81 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
82 assert(getVBaseClassOffset(PrimaryBase).isZero() &&
83 "Primary virtual base must be at offset 0!");
86 assert(getBaseClassOffset(PrimaryBase).isZero() &&
87 "Primary base must be at offset 0!");