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 18using namespace clang; 19 20void 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 31ASTRecordLayout::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. 44ASTRecordLayout::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 // Microsoft ABI doesn't have primary virtual base 79 if (Ctx.getTargetInfo().getCXXABI() != CXXABI_Microsoft) { 80 assert(getVBaseClassOffset(PrimaryBase).isZero() && 81 "Primary virtual base must be at offset 0!"); 82 } 83 } else { 84 assert(getBaseClassOffset(PrimaryBase).isZero() && 85 "Primary base must be at offset 0!"); 86 } 87 } 88#endif 89} 90