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), FieldOffsets(0), Alignment(alignment), 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 CharUnits vbptroffset, CharUnits datasize, 47 const uint64_t *fieldoffsets, 48 unsigned fieldcount, 49 CharUnits nonvirtualsize, 50 CharUnits nonvirtualalign, 51 CharUnits SizeOfLargestEmptySubobject, 52 const CXXRecordDecl *PrimaryBase, 53 bool IsPrimaryBaseVirtual, 54 const BaseOffsetsMapTy& BaseOffsets, 55 const BaseOffsetsMapTy& VBaseOffsets) 56 : Size(size), DataSize(datasize), FieldOffsets(0), Alignment(alignment), 57 FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo) 58 { 59 if (FieldCount > 0) { 60 FieldOffsets = new (Ctx) uint64_t[FieldCount]; 61 memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets)); 62 } 63 64 CXXInfo->PrimaryBase.setPointer(PrimaryBase); 65 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual); 66 CXXInfo->NonVirtualSize = nonvirtualsize; 67 CXXInfo->NonVirtualAlign = nonvirtualalign; 68 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject; 69 CXXInfo->BaseOffsets = BaseOffsets; 70 CXXInfo->VBaseOffsets = VBaseOffsets; 71 CXXInfo->VBPtrOffset = vbptroffset; 72 73 #ifndef NDEBUG 74 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) { 75 if (isPrimaryBaseVirtual()) { 76 // Microsoft ABI doesn't have primary virtual base 77 if (Ctx.getTargetInfo().getCXXABI() != CXXABI_Microsoft) { 78 assert(getVBaseClassOffset(PrimaryBase).isZero() && 79 "Primary virtual base must be at offset 0!"); 80 } 81 } else { 82 assert(getBaseClassOffsetInBits(PrimaryBase) == 0 && 83 "Primary base must be at offset 0!"); 84 } 85 } 86 #endif 87 } 88