forked from OSchip/llvm-project
219 lines
8.1 KiB
C++
219 lines
8.1 KiB
C++
//===------ SemaInherit.h - C++ Inheritance ---------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides Sema data structures that help analyse C++
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// inheritance semantics, including searching the inheritance
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// hierarchy.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_SEMA_INHERIT_H
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#define LLVM_CLANG_SEMA_INHERIT_H
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#include "clang/AST/DeclarationName.h"
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#include "clang/AST/DeclBase.h"
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#include "clang/AST/Type.h"
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#include "clang/AST/TypeOrdering.h"
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#include "llvm/ADT/SmallVector.h"
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#include <list>
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#include <map>
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namespace clang {
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class Sema;
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class CXXBaseSpecifier;
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class CXXRecordType;
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/// BasePathElement - An element in a path from a derived class to a
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/// base class. Each step in the path references the link from a
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/// derived class to one of its direct base classes, along with a
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/// base "number" that identifies which base subobject of the
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/// original derived class we are referencing.
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struct BasePathElement {
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/// Base - The base specifier that states the link from a derived
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/// class to a base class, which will be followed by this base
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/// path element.
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const CXXBaseSpecifier *Base;
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/// SubobjectNumber - Identifies which base class subobject (of type
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/// @c Base->getType()) this base path element refers to. This
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/// value is only valid if @c !Base->isVirtual(), because there
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/// is no base numbering for the zero or one virtual bases of a
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/// given type.
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int SubobjectNumber;
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};
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/// BasePath - Represents a path from a specific derived class
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/// (which is not represented as part of the path) to a particular
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/// (direct or indirect) base class subobject that contains some
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/// number of declarations with the same name. Individual elements
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/// in the path are described by the BasePathElement structure,
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/// which captures both the link from a derived class to one of its
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/// direct bases and identification describing which base class
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/// subobject is being used.
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struct BasePath : public llvm::SmallVector<BasePathElement, 4> {
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/// Decls - The set of declarations found inside this base class
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/// subobject.
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DeclContext::lookup_result Decls;
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};
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/// BasePaths - Represents the set of paths from a derived class to
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/// one of its (direct or indirect) bases. For example, given the
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/// following class hierachy:
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///
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/// @code
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/// class A { };
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/// class B : public A { };
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/// class C : public A { };
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/// class D : public B, public C{ };
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/// @endcode
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///
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/// There are two potential BasePaths to represent paths from D to a
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/// base subobject of type A. One path is (D,0) -> (B,0) -> (A,0)
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/// and another is (D,0)->(C,0)->(A,1). These two paths actually
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/// refer to two different base class subobjects of the same type,
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/// so the BasePaths object refers to an ambiguous path. On the
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/// other hand, consider the following class hierarchy:
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///
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/// @code
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/// class A { };
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/// class B : public virtual A { };
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/// class C : public virtual A { };
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/// class D : public B, public C{ };
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/// @endcode
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///
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/// Here, there are two potential BasePaths again, (D, 0) -> (B, 0)
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/// -> (A,v) and (D, 0) -> (C, 0) -> (A, v), but since both of them
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/// refer to the same base class subobject of type A (the virtual
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/// one), there is no ambiguity.
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class BasePaths {
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/// Origin - The type from which this search originated.
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QualType Origin;
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/// Paths - The actual set of paths that can be taken from the
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/// derived class to the same base class.
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std::list<BasePath> Paths;
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/// ClassSubobjects - Records the class subobjects for each class
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/// type that we've seen. The first element in the pair says
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/// whether we found a path to a virtual base for that class type,
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/// while the element contains the number of non-virtual base
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/// class subobjects for that class type. The key of the map is
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/// the cv-unqualified canonical type of the base class subobject.
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std::map<QualType, std::pair<bool, unsigned>, QualTypeOrdering>
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ClassSubobjects;
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/// FindAmbiguities - Whether Sema::IsDerivedFrom should try find
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/// ambiguous paths while it is looking for a path from a derived
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/// type to a base type.
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bool FindAmbiguities;
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/// RecordPaths - Whether Sema::IsDerivedFrom should record paths
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/// while it is determining whether there are paths from a derived
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/// type to a base type.
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bool RecordPaths;
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/// DetectVirtual - Whether Sema::IsDerivedFrom should abort the search
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/// if it finds a path that goes across a virtual base. The virtual class
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/// is also recorded.
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bool DetectVirtual;
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/// ScratchPath - A BasePath that is used by Sema::IsDerivedFrom
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/// to help build the set of paths.
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BasePath ScratchPath;
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/// DetectedVirtual - The base class that is virtual.
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const CXXRecordType *DetectedVirtual;
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friend class Sema;
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public:
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typedef std::list<BasePath>::const_iterator paths_iterator;
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/// BasePaths - Construct a new BasePaths structure to record the
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/// paths for a derived-to-base search.
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explicit BasePaths(bool FindAmbiguities = true,
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bool RecordPaths = true,
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bool DetectVirtual = true)
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: FindAmbiguities(FindAmbiguities), RecordPaths(RecordPaths),
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DetectVirtual(DetectVirtual), DetectedVirtual(0)
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{}
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paths_iterator begin() const { return Paths.begin(); }
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paths_iterator end() const { return Paths.end(); }
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BasePath& front() { return Paths.front(); }
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const BasePath& front() const { return Paths.front(); }
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bool isAmbiguous(QualType BaseType);
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/// isFindingAmbiguities - Whether we are finding multiple paths
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/// to detect ambiguities.
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bool isFindingAmbiguities() const { return FindAmbiguities; }
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/// isRecordingPaths - Whether we are recording paths.
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bool isRecordingPaths() const { return RecordPaths; }
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/// setRecordingPaths - Specify whether we should be recording
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/// paths or not.
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void setRecordingPaths(bool RP) { RecordPaths = RP; }
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/// isDetectingVirtual - Whether we are detecting virtual bases.
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bool isDetectingVirtual() const { return DetectVirtual; }
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/// getDetectedVirtual - The virtual base discovered on the path.
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const CXXRecordType* getDetectedVirtual() const {
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return DetectedVirtual;
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}
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/// @brief Retrieve the type from which this base-paths search
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/// began
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QualType getOrigin() const { return Origin; }
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void setOrigin(QualType Type) { Origin = Type; }
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void clear();
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void swap(BasePaths &Other);
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};
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/// MemberLookupCriteria - Criteria for performing lookup of a
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/// member of a C++ class. Objects of this type are used to direct
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/// Sema::LookupCXXClassMember.
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struct MemberLookupCriteria {
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/// MemberLookupCriteria - Constructs member lookup criteria to
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/// search for a base class of type Base.
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explicit MemberLookupCriteria(QualType Base)
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: LookupBase(true), Base(Base) { }
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/// MemberLookupCriteria - Constructs member lookup criteria to
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/// search for a class member with the given Name.
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explicit MemberLookupCriteria(DeclarationName Name,
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Sema::LookupNameKind NameKind,
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unsigned IDNS)
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: LookupBase(false), Name(Name), NameKind(NameKind), IDNS(IDNS) { }
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/// LookupBase - True if we are looking for a base class (whose
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/// type is Base). If false, we are looking for a named member of
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/// the class (with the name Name).
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bool LookupBase;
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/// Base - The type of the base class we're searching for, if
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/// LookupBase is true.
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QualType Base;
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/// Name - The name of the member we're searching for, if
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/// LookupBase is false.
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DeclarationName Name;
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Sema::LookupNameKind NameKind;
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unsigned IDNS;
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};
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}
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#endif
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