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 (CXXInfo) {
22 CXXInfo->~CXXRecordLayoutInfo();
23 Ctx.Deallocate(CXXInfo);
24 }
25 this->~ASTRecordLayout();
26 Ctx.Deallocate(this);
27 }
28
ASTRecordLayout(const ASTContext & Ctx,CharUnits size,CharUnits alignment,CharUnits requiredAlignment,CharUnits datasize,ArrayRef<uint64_t> fieldoffsets)29 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
30 CharUnits alignment,
31 CharUnits requiredAlignment,
32 CharUnits datasize,
33 ArrayRef<uint64_t> fieldoffsets)
34 : Size(size), DataSize(datasize), Alignment(alignment),
35 RequiredAlignment(requiredAlignment), CXXInfo(nullptr) {
36 FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
37 }
38
39 // Constructor for C++ records.
ASTRecordLayout(const ASTContext & Ctx,CharUnits size,CharUnits alignment,CharUnits requiredAlignment,bool hasOwnVFPtr,bool hasExtendableVFPtr,CharUnits vbptroffset,CharUnits datasize,ArrayRef<uint64_t> fieldoffsets,CharUnits nonvirtualsize,CharUnits nonvirtualalignment,CharUnits SizeOfLargestEmptySubobject,const CXXRecordDecl * PrimaryBase,bool IsPrimaryBaseVirtual,const CXXRecordDecl * BaseSharingVBPtr,bool EndsWithZeroSizedObject,bool LeadsWithZeroSizedBase,const BaseOffsetsMapTy & BaseOffsets,const VBaseOffsetsMapTy & VBaseOffsets)40 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
41 CharUnits size, CharUnits alignment,
42 CharUnits requiredAlignment,
43 bool hasOwnVFPtr, bool hasExtendableVFPtr,
44 CharUnits vbptroffset,
45 CharUnits datasize,
46 ArrayRef<uint64_t> fieldoffsets,
47 CharUnits nonvirtualsize,
48 CharUnits nonvirtualalignment,
49 CharUnits SizeOfLargestEmptySubobject,
50 const CXXRecordDecl *PrimaryBase,
51 bool IsPrimaryBaseVirtual,
52 const CXXRecordDecl *BaseSharingVBPtr,
53 bool EndsWithZeroSizedObject,
54 bool LeadsWithZeroSizedBase,
55 const BaseOffsetsMapTy& BaseOffsets,
56 const VBaseOffsetsMapTy& VBaseOffsets)
57 : Size(size), DataSize(datasize), Alignment(alignment),
58 RequiredAlignment(requiredAlignment), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
59 {
60 FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
61
62 CXXInfo->PrimaryBase.setPointer(PrimaryBase);
63 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
64 CXXInfo->NonVirtualSize = nonvirtualsize;
65 CXXInfo->NonVirtualAlignment = nonvirtualalignment;
66 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
67 CXXInfo->BaseOffsets = BaseOffsets;
68 CXXInfo->VBaseOffsets = VBaseOffsets;
69 CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
70 CXXInfo->VBPtrOffset = vbptroffset;
71 CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
72 CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
73 CXXInfo->EndsWithZeroSizedObject = EndsWithZeroSizedObject;
74 CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase;
75
76
77 #ifndef NDEBUG
78 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
79 if (isPrimaryBaseVirtual()) {
80 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
81 assert(getVBaseClassOffset(PrimaryBase).isZero() &&
82 "Primary virtual base must be at offset 0!");
83 }
84 } else {
85 assert(getBaseClassOffset(PrimaryBase).isZero() &&
86 "Primary base must be at offset 0!");
87 }
88 }
89 #endif
90 }
91