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📄 APValue.h(20.92 KB)
📄 AST.h(907 B)
📄 ASTConcept.h(7.02 KB)
📄 ASTConsumer.h(5.99 KB)
📄 ASTContext.h(122.68 KB)
📄 ASTContextAllocate.h(1.33 KB)
📄 ASTDiagnostic.h(1.34 KB)
📄 ASTDumper.h(1.59 KB)
📄 ASTDumperUtils.h(3.49 KB)
📄 ASTFwd.h(1.01 KB)
📄 ASTImporter.h(22.86 KB)
📄 ASTImporterLookupTable.h(2.7 KB)
📄 ASTImporterSharedState.h(2.51 KB)
📄 ASTLambda.h(3.04 KB)
📄 ASTMutationListener.h(5.84 KB)
📄 ASTNodeTraverser.h(21.38 KB)
📄 ASTStructuralEquivalence.h(5.08 KB)
📄 ASTTypeTraits.h(19.65 KB)
📄 ASTUnresolvedSet.h(3.37 KB)
📄 ASTVector.h(11.75 KB)
📄 AbstractBasicReader.h(8.82 KB)
📄 AbstractBasicWriter.h(7.97 KB)
📄 AbstractTypeReader.h(922 B)
📄 AbstractTypeWriter.h(944 B)
📄 Attr.h(11.87 KB)
📄 AttrIterator.h(4.14 KB)
📄 AttrVisitor.h(2.56 KB)
📄 Availability.h(1.97 KB)
📄 BaseSubobject.h(2.74 KB)
📄 BuiltinTypes.def(9.91 KB)
📄 CXXInheritance.h(14.87 KB)
📄 CXXRecordDeclDefinitionBits.def(9.23 KB)
📄 CanonicalType.h(24.86 KB)
📄 CharUnits.h(8.02 KB)
📄 Comment.h(31.03 KB)
📄 CommentBriefParser.h(1.39 KB)
📄 CommentCommandTraits.h(5.86 KB)
📄 CommentCommands.td(9.27 KB)
📄 CommentDiagnostic.h(509 B)
📄 CommentHTMLNamedCharacterReferences.td(4.98 KB)
📄 CommentHTMLTags.td(2.17 KB)
📄 CommentLexer.h(9.96 KB)
📄 CommentParser.h(3.24 KB)
📄 CommentSema.h(9.87 KB)
📄 CommentVisitor.h(2.38 KB)
📄 ComparisonCategories.h(7.41 KB)
📄 ComputeDependence.h(7.41 KB)
📄 CurrentSourceLocExprScope.h(2.43 KB)
📄 DataCollection.h(2.45 KB)
📄 Decl.h(168.07 KB)
📄 DeclAccessPair.h(1.77 KB)
📄 DeclBase.h(93.13 KB)
📄 DeclCXX.h(151.69 KB)
📄 DeclContextInternals.h(8.22 KB)
📄 DeclFriend.h(8.06 KB)
📄 DeclGroup.h(4.11 KB)
📄 DeclLookups.h(3.64 KB)
📄 DeclObjC.h(101.2 KB)
📄 DeclObjCCommon.h(1.72 KB)
📄 DeclOpenMP.h(19.33 KB)
📄 DeclTemplate.h(122.19 KB)
📄 DeclVisitor.h(2.51 KB)
📄 DeclarationName.h(33.77 KB)
📄 DependenceFlags.h(10.99 KB)
📄 DependentDiagnostic.h(5.4 KB)
📄 EvaluatedExprVisitor.h(4.45 KB)
📄 Expr.h(234.85 KB)
📄 ExprCXX.h(169.78 KB)
📄 ExprConcepts.h(19.62 KB)
📄 ExprObjC.h(58.96 KB)
📄 ExprOpenMP.h(15.48 KB)
📄 ExternalASTMerger.h(8.11 KB)
📄 ExternalASTSource.h(20.55 KB)
📄 FormatString.h(22.81 KB)
📄 GlobalDecl.h(7.16 KB)
📄 JSONNodeDumper.h(17.53 KB)
📄 LambdaCapture.h(4.71 KB)
📄 LexicallyOrderedRecursiveASTVisitor.h(5.92 KB)
📄 LocInfoType.h(1.84 KB)
📄 Mangle.h(10.65 KB)
📄 MangleNumberingContext.h(2 KB)
📄 NSAPI.h(9.23 KB)
📄 NestedNameSpecifier.h(18.53 KB)
📄 NonTrivialTypeVisitor.h(4 KB)
📄 ODRHash.h(3.42 KB)
📄 OSLog.h(5.08 KB)
📄 OpenMPClause.h(276.08 KB)
📄 OperationKinds.def(14.91 KB)
📄 OperationKinds.h(1.5 KB)
📄 OptionalDiagnostic.h(2.39 KB)
📄 ParentMap.h(1.89 KB)
📄 ParentMapContext.h(4.74 KB)
📄 PrettyDeclStackTrace.h(1.39 KB)
📄 PrettyPrinter.h(8.47 KB)
📄 PropertiesBase.td(17.03 KB)
📄 QualTypeNames.h(3.15 KB)
📄 RawCommentList.h(6.6 KB)
📄 RecordLayout.h(11.49 KB)
📄 RecursiveASTVisitor.h(124.41 KB)
📄 Redeclarable.h(14.34 KB)
📄 SelectorLocationsKind.h(3.28 KB)
📄 Stmt.h(113 KB)
📄 StmtCXX.h(17.59 KB)
📄 StmtDataCollectors.td(5.64 KB)
📄 StmtGraphTraits.h(2.18 KB)
📄 StmtIterator.h(4.2 KB)
📄 StmtObjC.h(12.86 KB)
📄 StmtOpenMP.h(189.5 KB)
📄 StmtVisitor.h(8.74 KB)
📄 TemplateArgumentVisitor.h(3.38 KB)
📄 TemplateBase.h(22.86 KB)
📄 TemplateName.h(19.34 KB)
📄 TextNodeDumper.h(15.7 KB)
📄 Type.h(248.38 KB)
📄 TypeLoc.h(73.03 KB)
📄 TypeLocNodes.def(1.45 KB)
📄 TypeLocVisitor.h(1.76 KB)
📄 TypeOrdering.h(2.38 KB)
📄 TypeProperties.td(25.87 KB)
📄 TypeVisitor.h(3.32 KB)
📄 UnresolvedSet.h(5.25 KB)
📄 VTTBuilder.h(5.19 KB)
📄 VTableBuilder.h(20.31 KB)

Editing: RecordLayout.h

//===- RecordLayout.h - Layout information for a struct/union ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//  This file defines the RecordLayout interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_RECORDLAYOUT_H
#define LLVM_CLANG_AST_RECORDLAYOUT_H

#include "clang/AST/ASTVector.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/DeclCXX.h"
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerIntPair.h"
#include <cassert>
#include <cstdint>

namespace clang {

class ASTContext;
class CXXRecordDecl;

/// ASTRecordLayout -
/// This class contains layout information for one RecordDecl,
/// which is a struct/union/class.  The decl represented must be a definition,
/// not a forward declaration.
/// This class is also used to contain layout information for one
/// ObjCInterfaceDecl. FIXME - Find appropriate name.
/// These objects are managed by ASTContext.
class ASTRecordLayout {
public:
  struct VBaseInfo {
    /// The offset to this virtual base in the complete-object layout
    /// of this class.
    CharUnits VBaseOffset;

private:
    /// Whether this virtual base requires a vtordisp field in the
    /// Microsoft ABI.  These fields are required for certain operations
    /// in constructors and destructors.
    bool HasVtorDisp = false;

public:
    VBaseInfo() = default;
    VBaseInfo(CharUnits VBaseOffset, bool hasVtorDisp)
        : VBaseOffset(VBaseOffset), HasVtorDisp(hasVtorDisp) {}

bool hasVtorDisp() const { return HasVtorDisp; }
  };

using VBaseOffsetsMapTy = llvm::DenseMap<const CXXRecordDecl *, VBaseInfo>;

private:
  friend class ASTContext;

/// Size - Size of record in characters.
  CharUnits Size;

/// DataSize - Size of record in characters without tail padding.
  CharUnits DataSize;

// Alignment - Alignment of record in characters.
  CharUnits Alignment;

// UnadjustedAlignment - Maximum of the alignments of the record members in
  // characters.
  CharUnits UnadjustedAlignment;

/// RequiredAlignment - The required alignment of the object.  In the MS-ABI
  /// the __declspec(align()) trumps #pramga pack and must always be obeyed.
  CharUnits RequiredAlignment;

/// FieldOffsets - Array of field offsets in bits.
  ASTVector<uint64_t> FieldOffsets;

/// CXXRecordLayoutInfo - Contains C++ specific layout information.
  struct CXXRecordLayoutInfo {
    /// NonVirtualSize - The non-virtual size (in chars) of an object, which is
    /// the size of the object without virtual bases.
    CharUnits NonVirtualSize;

/// NonVirtualAlignment - The non-virtual alignment (in chars) of an object,
    /// which is the alignment of the object without virtual bases.
    CharUnits NonVirtualAlignment;

/// SizeOfLargestEmptySubobject - The size of the largest empty subobject
    /// (either a base or a member). Will be zero if the class doesn't contain
    /// any empty subobjects.
    CharUnits SizeOfLargestEmptySubobject;

/// VBPtrOffset - Virtual base table offset (Microsoft-only).
    CharUnits VBPtrOffset;

/// HasOwnVFPtr - Does this class provide a virtual function table
    /// (vtable in Itanium, vftbl in Microsoft) that is independent from
    /// its base classes?
    bool HasOwnVFPtr : 1;

/// HasVFPtr - Does this class have a vftable that could be extended by
    /// a derived class.  The class may have inherited this pointer from
    /// a primary base class.
    bool HasExtendableVFPtr : 1;

/// EndsWithZeroSizedObject - True if this class contains a zero sized
    /// member or base or a base with a zero sized member or base.
    /// Only used for MS-ABI.
    bool EndsWithZeroSizedObject : 1;

/// True if this class is zero sized or first base is zero sized or
    /// has this property.  Only used for MS-ABI.
    bool LeadsWithZeroSizedBase : 1;

/// PrimaryBase - The primary base info for this record.
    llvm::PointerIntPair<const CXXRecordDecl *, 1, bool> PrimaryBase;

/// BaseSharingVBPtr - The base we share vbptr with.
    const CXXRecordDecl *BaseSharingVBPtr;

/// FIXME: This should really use a SmallPtrMap, once we have one in LLVM :)
    using BaseOffsetsMapTy = llvm::DenseMap<const CXXRecordDecl *, CharUnits>;

/// BaseOffsets - Contains a map from base classes to their offset.
    BaseOffsetsMapTy BaseOffsets;

/// VBaseOffsets - Contains a map from vbase classes to their offset.
    VBaseOffsetsMapTy VBaseOffsets;
  };

/// CXXInfo - If the record layout is for a C++ record, this will have
  /// C++ specific information about the record.
  CXXRecordLayoutInfo *CXXInfo = nullptr;

ASTRecordLayout(const ASTContext &Ctx, CharUnits size, CharUnits alignment,
                  CharUnits unadjustedAlignment,
                  CharUnits requiredAlignment, CharUnits datasize,
                  ArrayRef<uint64_t> fieldoffsets);

using BaseOffsetsMapTy = CXXRecordLayoutInfo::BaseOffsetsMapTy;

// Constructor for C++ records.
  ASTRecordLayout(const ASTContext &Ctx,
                  CharUnits size, CharUnits alignment,
                  CharUnits unadjustedAlignment,
                  CharUnits requiredAlignment,
                  bool hasOwnVFPtr, bool hasExtendableVFPtr,
                  CharUnits vbptroffset,
                  CharUnits datasize,
                  ArrayRef<uint64_t> fieldoffsets,
                  CharUnits nonvirtualsize, CharUnits nonvirtualalignment,
                  CharUnits SizeOfLargestEmptySubobject,
                  const CXXRecordDecl *PrimaryBase,
                  bool IsPrimaryBaseVirtual,
                  const CXXRecordDecl *BaseSharingVBPtr,
                  bool EndsWithZeroSizedObject,
                  bool LeadsWithZeroSizedBase,
                  const BaseOffsetsMapTy& BaseOffsets,
                  const VBaseOffsetsMapTy& VBaseOffsets);

~ASTRecordLayout() = default;

void Destroy(ASTContext &Ctx);

public:
  ASTRecordLayout(const ASTRecordLayout &) = delete;
  ASTRecordLayout &operator=(const ASTRecordLayout &) = delete;

/// getAlignment - Get the record alignment in characters.
  CharUnits getAlignment() const { return Alignment; }

/// getUnadjustedAlignment - Get the record alignment in characters, before
  /// alignment adjustement.
  CharUnits getUnadjustedAlignment() const { return UnadjustedAlignment; }

/// getSize - Get the record size in characters.
  CharUnits getSize() const { return Size; }

/// getFieldCount - Get the number of fields in the layout.
  unsigned getFieldCount() const { return FieldOffsets.size(); }

/// getFieldOffset - Get the offset of the given field index, in
  /// bits.
  uint64_t getFieldOffset(unsigned FieldNo) const {
    return FieldOffsets[FieldNo];
  }

/// getDataSize() - Get the record data size, which is the record size
  /// without tail padding, in characters.
  CharUnits getDataSize() const {
    return DataSize;
  }

/// getNonVirtualSize - Get the non-virtual size (in chars) of an object,
  /// which is the size of the object without virtual bases.
  CharUnits getNonVirtualSize() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");

return CXXInfo->NonVirtualSize;
  }

/// getNonVirtualSize - Get the non-virtual alignment (in chars) of an object,
  /// which is the alignment of the object without virtual bases.
  CharUnits getNonVirtualAlignment() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");

return CXXInfo->NonVirtualAlignment;
  }

/// getPrimaryBase - Get the primary base for this record.
  const CXXRecordDecl *getPrimaryBase() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");

return CXXInfo->PrimaryBase.getPointer();
  }

/// isPrimaryBaseVirtual - Get whether the primary base for this record
  /// is virtual or not.
  bool isPrimaryBaseVirtual() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");

return CXXInfo->PrimaryBase.getInt();
  }

/// getBaseClassOffset - Get the offset, in chars, for the given base class.
  CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    assert(CXXInfo->BaseOffsets.count(Base) && "Did not find base!");

return CXXInfo->BaseOffsets[Base];
  }

/// getVBaseClassOffset - Get the offset, in chars, for the given base class.
  CharUnits getVBaseClassOffset(const CXXRecordDecl *VBase) const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    assert(CXXInfo->VBaseOffsets.count(VBase) && "Did not find base!");

return CXXInfo->VBaseOffsets[VBase].VBaseOffset;
  }

CharUnits getSizeOfLargestEmptySubobject() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->SizeOfLargestEmptySubobject;
  }

/// hasOwnVFPtr - Does this class provide its own virtual-function
  /// table pointer, rather than inheriting one from a primary base
  /// class?  If so, it is at offset zero.
  ///
  /// This implies that the ABI has no primary base class, meaning
  /// that it has no base classes that are suitable under the conditions
  /// of the ABI.
  bool hasOwnVFPtr() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->HasOwnVFPtr;
  }

/// hasVFPtr - Does this class have a virtual function table pointer
  /// that can be extended by a derived class?  This is synonymous with
  /// this class having a VFPtr at offset zero.
  bool hasExtendableVFPtr() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->HasExtendableVFPtr;
  }

/// hasOwnVBPtr - Does this class provide its own virtual-base
  /// table pointer, rather than inheriting one from a primary base
  /// class?
  ///
  /// This implies that the ABI has no primary base class, meaning
  /// that it has no base classes that are suitable under the conditions
  /// of the ABI.
  bool hasOwnVBPtr() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return hasVBPtr() && !CXXInfo->BaseSharingVBPtr;
  }

/// hasVBPtr - Does this class have a virtual function table pointer.
  bool hasVBPtr() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return !CXXInfo->VBPtrOffset.isNegative();
  }

CharUnits getRequiredAlignment() const {
    return RequiredAlignment;
  }

bool endsWithZeroSizedObject() const {
    return CXXInfo && CXXInfo->EndsWithZeroSizedObject;
  }

bool leadsWithZeroSizedBase() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->LeadsWithZeroSizedBase;
  }

/// getVBPtrOffset - Get the offset for virtual base table pointer.
  /// This is only meaningful with the Microsoft ABI.
  CharUnits getVBPtrOffset() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->VBPtrOffset;
  }

const CXXRecordDecl *getBaseSharingVBPtr() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->BaseSharingVBPtr;
  }

const VBaseOffsetsMapTy &getVBaseOffsetsMap() const {
    assert(CXXInfo && "Record layout does not have C++ specific info!");
    return CXXInfo->VBaseOffsets;
  }
};

} // namespace clang

#endif // LLVM_CLANG_AST_RECORDLAYOUT_H

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Editing: RecordLayout.h

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