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 } 96