contrib/llvm/tools/clang/lib/AST/RecordLayout.cpp

   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 }