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 
17 using namespace clang;
18 
19 void ASTRecordLayout::Destroy(ASTContext &Ctx) {
20   if (FieldOffsets)
21     Ctx.Deallocate(FieldOffsets);
22   if (CXXInfo) {
23     Ctx.Deallocate(CXXInfo);
24     CXXInfo->~CXXRecordLayoutInfo();
25   }
26   this->~ASTRecordLayout();
27   Ctx.Deallocate(this);
28 }
29 
30 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
31                                  CharUnits alignment, CharUnits datasize,
32                                  const uint64_t *fieldoffsets,
33                                  unsigned fieldcount)
34   : Size(size), DataSize(datasize), FieldOffsets(0), Alignment(alignment),
35     FieldCount(fieldcount), CXXInfo(0) {
36   if (FieldCount > 0)  {
37     FieldOffsets = new (Ctx) uint64_t[FieldCount];
38     memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
39   }
40 }
41 
42 // Constructor for C++ records.
43 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
44                                  CharUnits size, CharUnits alignment,
45                                  CharUnits datasize,
46                                  const uint64_t *fieldoffsets,
47                                  unsigned fieldcount,
48                                  CharUnits nonvirtualsize,
49                                  CharUnits nonvirtualalign,
50                                  CharUnits SizeOfLargestEmptySubobject,
51                                  const CXXRecordDecl *PrimaryBase,
52                                  bool IsPrimaryBaseVirtual,
53                                  const BaseOffsetsMapTy& BaseOffsets,
54                                  const BaseOffsetsMapTy& VBaseOffsets)
55   : Size(size), DataSize(datasize), FieldOffsets(0), Alignment(alignment),
56     FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
57 {
58   if (FieldCount > 0)  {
59     FieldOffsets = new (Ctx) uint64_t[FieldCount];
60     memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
61   }
62 
63   CXXInfo->PrimaryBase.setPointer(PrimaryBase);
64   CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
65   CXXInfo->NonVirtualSize = nonvirtualsize;
66   CXXInfo->NonVirtualAlign = nonvirtualalign;
67   CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
68   CXXInfo->BaseOffsets = BaseOffsets;
69   CXXInfo->VBaseOffsets = VBaseOffsets;
70 
71 #ifndef NDEBUG
72     if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
73       if (isPrimaryBaseVirtual())
74         assert(getVBaseClassOffset(PrimaryBase).isZero() &&
75                "Primary virtual base must be at offset 0!");
76       else
77         assert(getBaseClassOffsetInBits(PrimaryBase) == 0 &&
78                "Primary base must be at offset 0!");
79     }
80 #endif
81 }
82