1 //===-- RecordLayout.cpp - Layout information for a struct/union -*- C++ -*-==//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the RecordLayout interface.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/RecordLayout.h"
16 #include "clang/Basic/TargetInfo.h"
17
18 using namespace clang;
19
Destroy(ASTContext & Ctx)20 void ASTRecordLayout::Destroy(ASTContext &Ctx) {
21 if (FieldOffsets)
22 Ctx.Deallocate(FieldOffsets);
23 if (CXXInfo) {
24 Ctx.Deallocate(CXXInfo);
25 CXXInfo->~CXXRecordLayoutInfo();
26 }
27 this->~ASTRecordLayout();
28 Ctx.Deallocate(this);
29 }
30
ASTRecordLayout(const ASTContext & Ctx,CharUnits size,CharUnits alignment,CharUnits datasize,const uint64_t * fieldoffsets,unsigned fieldcount)31 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
32 CharUnits alignment, CharUnits datasize,
33 const uint64_t *fieldoffsets,
34 unsigned fieldcount)
35 : Size(size), DataSize(datasize), Alignment(alignment), FieldOffsets(0),
36 FieldCount(fieldcount), CXXInfo(0) {
37 if (FieldCount > 0) {
38 FieldOffsets = new (Ctx) uint64_t[FieldCount];
39 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
40 }
41 }
42
43 // Constructor for C++ records.
ASTRecordLayout(const ASTContext & Ctx,CharUnits size,CharUnits alignment,bool hasOwnVFPtr,CharUnits vbptroffset,CharUnits datasize,const uint64_t * fieldoffsets,unsigned fieldcount,CharUnits nonvirtualsize,CharUnits nonvirtualalign,CharUnits SizeOfLargestEmptySubobject,const CXXRecordDecl * PrimaryBase,bool IsPrimaryBaseVirtual,const BaseOffsetsMapTy & BaseOffsets,const VBaseOffsetsMapTy & VBaseOffsets)44 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
45 CharUnits size, CharUnits alignment,
46 bool hasOwnVFPtr, CharUnits vbptroffset,
47 CharUnits datasize,
48 const uint64_t *fieldoffsets,
49 unsigned fieldcount,
50 CharUnits nonvirtualsize,
51 CharUnits nonvirtualalign,
52 CharUnits SizeOfLargestEmptySubobject,
53 const CXXRecordDecl *PrimaryBase,
54 bool IsPrimaryBaseVirtual,
55 const BaseOffsetsMapTy& BaseOffsets,
56 const VBaseOffsetsMapTy& VBaseOffsets)
57 : Size(size), DataSize(datasize), Alignment(alignment), FieldOffsets(0),
58 FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
59 {
60 if (FieldCount > 0) {
61 FieldOffsets = new (Ctx) uint64_t[FieldCount];
62 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
63 }
64
65 CXXInfo->PrimaryBase.setPointer(PrimaryBase);
66 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
67 CXXInfo->NonVirtualSize = nonvirtualsize;
68 CXXInfo->NonVirtualAlign = nonvirtualalign;
69 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
70 CXXInfo->BaseOffsets = BaseOffsets;
71 CXXInfo->VBaseOffsets = VBaseOffsets;
72 CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
73 CXXInfo->VBPtrOffset = vbptroffset;
74
75 #ifndef NDEBUG
76 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
77 if (isPrimaryBaseVirtual()) {
78 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
79 assert(getVBaseClassOffset(PrimaryBase).isZero() &&
80 "Primary virtual base must be at offset 0!");
81 }
82 } else {
83 assert(getBaseClassOffset(PrimaryBase).isZero() &&
84 "Primary base must be at offset 0!");
85 }
86 }
87 #endif
88 }
89