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 #include "clang/Basic/TargetInfo.h"
  17
  18 using namespace clang;
  19
  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
  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.
  44 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
  45                                  CharUnits size, CharUnits alignment,
  46                                  bool hasOwnVFPtr, bool hasExtendableVFPtr,
  47                                  CharUnits vbptroffset,
  48                                  CharUnits datasize,
  49                                  const uint64_t *fieldoffsets,
  50                                  unsigned fieldcount,
  51                                  CharUnits nonvirtualsize,
  52                                  CharUnits nonvirtualalign,
  53                                  CharUnits SizeOfLargestEmptySubobject,
  54                                  const CXXRecordDecl *PrimaryBase,
  55                                  bool IsPrimaryBaseVirtual,
  56                                  const CXXRecordDecl *BaseSharingVBPtr,
  57                                  bool AlignAfterVBases,
  58                                  const BaseOffsetsMapTy& BaseOffsets,
  59                                  const VBaseOffsetsMapTy& VBaseOffsets)
  60   : Size(size), DataSize(datasize), Alignment(alignment), FieldOffsets(0),
  61     FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
  62 {
  63   if (FieldCount > 0)  {
  64     FieldOffsets = new (Ctx) uint64_t[FieldCount];
  65     memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
  66   }
  67
  68   CXXInfo->PrimaryBase.setPointer(PrimaryBase);
  69   CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
  70   CXXInfo->NonVirtualSize = nonvirtualsize;
  71   CXXInfo->NonVirtualAlign = nonvirtualalign;
  72   CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
  73   CXXInfo->BaseOffsets = BaseOffsets;
  74   CXXInfo->VBaseOffsets = VBaseOffsets;
  75   CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
  76   CXXInfo->VBPtrOffset = vbptroffset;
  77   CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
  78   CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
  79   CXXInfo->AlignAfterVBases = AlignAfterVBases;
  80
  81
  82 #ifndef NDEBUG
  83     if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
  84       if (isPrimaryBaseVirtual()) {
  85         if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
  86           assert(getVBaseClassOffset(PrimaryBase).isZero() &&
  87                  "Primary virtual base must be at offset 0!");
  88         }
  89       } else {
  90         assert(getBaseClassOffset(PrimaryBase).isZero() &&
  91                "Primary base must be at offset 0!");
  92       }
  93     }
  94 #endif
  95 }