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, 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 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) { 79 assert(getVBaseClassOffset(PrimaryBase).isZero() && 80 "Primary virtual base must be at offset 0!"); 81 } 82 } else { 83 assert(getBaseClassOffset(PrimaryBase).isZero() && 84 "Primary base must be at offset 0!"); 85 } 86 } 87 #endif 88 } 89
