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1 //===- RecordLayout.cpp - Layout information for a struct/union -----------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file defines the RecordLayout interface.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "clang/AST/RecordLayout.h"
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14 #include "clang/AST/ASTContext.h"
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15 #include "clang/Basic/TargetCXXABI.h"
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16 #include "clang/Basic/TargetInfo.h"
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17 #include <cassert>
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18
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19 using namespace clang;
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20
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21 void ASTRecordLayout::Destroy(ASTContext &Ctx) {
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22 if (CXXInfo) {
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23 CXXInfo->~CXXRecordLayoutInfo();
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24 Ctx.Deallocate(CXXInfo);
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25 }
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26 this->~ASTRecordLayout();
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27 Ctx.Deallocate(this);
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28 }
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29
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30 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx, CharUnits size,
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31 CharUnits alignment,
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32 CharUnits unadjustedAlignment,
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33 CharUnits requiredAlignment,
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34 CharUnits datasize,
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35 ArrayRef<uint64_t> fieldoffsets)
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36 : Size(size), DataSize(datasize), Alignment(alignment),
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37 UnadjustedAlignment(unadjustedAlignment),
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38 RequiredAlignment(requiredAlignment) {
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39 FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
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40 }
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41
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42 // Constructor for C++ records.
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43 ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
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44 CharUnits size, CharUnits alignment,
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45 CharUnits unadjustedAlignment,
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46 CharUnits requiredAlignment,
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47 bool hasOwnVFPtr, bool hasExtendableVFPtr,
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48 CharUnits vbptroffset,
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49 CharUnits datasize,
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50 ArrayRef<uint64_t> fieldoffsets,
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51 CharUnits nonvirtualsize,
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52 CharUnits nonvirtualalignment,
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53 CharUnits SizeOfLargestEmptySubobject,
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54 const CXXRecordDecl *PrimaryBase,
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55 bool IsPrimaryBaseVirtual,
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56 const CXXRecordDecl *BaseSharingVBPtr,
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57 bool EndsWithZeroSizedObject,
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58 bool LeadsWithZeroSizedBase,
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59 const BaseOffsetsMapTy& BaseOffsets,
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60 const VBaseOffsetsMapTy& VBaseOffsets)
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61 : Size(size), DataSize(datasize), Alignment(alignment),
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62 UnadjustedAlignment(unadjustedAlignment),
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63 RequiredAlignment(requiredAlignment), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
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64 {
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65 FieldOffsets.append(Ctx, fieldoffsets.begin(), fieldoffsets.end());
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66
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67 CXXInfo->PrimaryBase.setPointer(PrimaryBase);
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68 CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
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69 CXXInfo->NonVirtualSize = nonvirtualsize;
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70 CXXInfo->NonVirtualAlignment = nonvirtualalignment;
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71 CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
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72 CXXInfo->BaseOffsets = BaseOffsets;
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73 CXXInfo->VBaseOffsets = VBaseOffsets;
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74 CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
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75 CXXInfo->VBPtrOffset = vbptroffset;
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76 CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
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77 CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
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78 CXXInfo->EndsWithZeroSizedObject = EndsWithZeroSizedObject;
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79 CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase;
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80
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81 #ifndef NDEBUG
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82 if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
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83 if (isPrimaryBaseVirtual()) {
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84 if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
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85 assert(getVBaseClassOffset(PrimaryBase).isZero() &&
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86 "Primary virtual base must be at offset 0!");
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87 }
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88 } else {
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89 assert(getBaseClassOffset(PrimaryBase).isZero() &&
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90 "Primary base must be at offset 0!");
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91 }
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92 }
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93 #endif
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94 }
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