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 CXXInfo->~CXXRecordLayoutInfo(); 25 Ctx.Deallocate(CXXInfo); 26 } 27 this->~ASTRecordLayout(); 28 Ctx.Deallocate(this); 29 } 30 31 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size, 32 CharUnits alignment, 33 CharUnits requiredAlignment, 34 CharUnits datasize, 35 const uint64_t *fieldoffsets, 36 unsigned fieldcount) 37 : Size(size), DataSize(datasize), Alignment(alignment), 38 RequiredAlignment(requiredAlignment), FieldOffsets(nullptr), 39 FieldCount(fieldcount), CXXInfo(nullptr) { 40 if (FieldCount > 0) { 41 FieldOffsets = new (Ctx) uint64_t[FieldCount]; 42 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets)); 43 } 44 } 45 46 // Constructor for C++ records. 47 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, 48 CharUnits size, CharUnits alignment, 49 CharUnits requiredAlignment, 50 bool hasOwnVFPtr, bool hasExtendableVFPtr, 51 CharUnits vbptroffset, 52 CharUnits datasize, 53 const uint64_t *fieldoffsets, 54 unsigned fieldcount, 55 CharUnits nonvirtualsize, 56 CharUnits nonvirtualalignment, 57 CharUnits SizeOfLargestEmptySubobject, 58 const CXXRecordDecl *PrimaryBase, 59 bool IsPrimaryBaseVirtual, 60 const CXXRecordDecl *BaseSharingVBPtr, 61 bool HasZeroSizedSubObject, 62 bool LeadsWithZeroSizedBase, 63 const BaseOffsetsMapTy& BaseOffsets, 64 const VBaseOffsetsMapTy& VBaseOffsets) 65 : Size(size), DataSize(datasize), Alignment(alignment), 66 RequiredAlignment(requiredAlignment), FieldOffsets(nullptr), 67 FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo) 68 { 69 if (FieldCount > 0) { 70 FieldOffsets = new (Ctx) uint64_t[FieldCount]; 71 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets)); 72 } 73 74 CXXInfo->PrimaryBase.setPointer(PrimaryBase); 75 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual); 76 CXXInfo->NonVirtualSize = nonvirtualsize; 77 CXXInfo->NonVirtualAlignment = nonvirtualalignment; 78 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject; 79 CXXInfo->BaseOffsets = BaseOffsets; 80 CXXInfo->VBaseOffsets = VBaseOffsets; 81 CXXInfo->HasOwnVFPtr = hasOwnVFPtr; 82 CXXInfo->VBPtrOffset = vbptroffset; 83 CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr; 84 CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr; 85 CXXInfo->HasZeroSizedSubObject = HasZeroSizedSubObject; 86 CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase; 87 88 89 #ifndef NDEBUG 90 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) { 91 if (isPrimaryBaseVirtual()) { 92 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) { 93 assert(getVBaseClassOffset(PrimaryBase).isZero() && 94 "Primary virtual base must be at offset 0!"); 95 } 96 } else { 97 assert(getBaseClassOffset(PrimaryBase).isZero() && 98 "Primary base must be at offset 0!"); 99 } 100 } 101 #endif 102 } 103
