1 //===--- ASTConsumer.h - Abstract interface for reading ASTs ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the ASTConsumer class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_AST_ASTCONSUMER_H
15 #define LLVM_CLANG_AST_ASTCONSUMER_H
17 #include "llvm/ADT/StringRef.h"
25 class ASTMutationListener;
26 class ASTDeserializationListener; // layering violation because void* is ugly
27 class SemaConsumer; // layering violation required for safe SemaConsumer
33 /// ASTConsumer - This is an abstract interface that should be implemented by
34 /// clients that read ASTs. This abstraction layer allows the client to be
35 /// independent of the AST producer (e.g. parser vs AST dump file reader, etc).
37 /// \brief Whether this AST consumer also requires information about
38 /// semantic analysis.
41 friend class SemaConsumer;
44 ASTConsumer() : SemaConsumer(false) { }
46 virtual ~ASTConsumer() {}
48 /// Initialize - This is called to initialize the consumer, providing the
50 virtual void Initialize(ASTContext &Context) {}
52 /// HandleTopLevelDecl - Handle the specified top-level declaration. This is
53 /// called by the parser to process every top-level Decl*.
55 /// \returns true to continue parsing, or false to abort parsing.
56 virtual bool HandleTopLevelDecl(DeclGroupRef D);
58 /// \brief This callback is invoked each time an inline method definition is
60 virtual void HandleInlineMethodDefinition(CXXMethodDecl *D) {}
62 /// HandleInterestingDecl - Handle the specified interesting declaration. This
63 /// is called by the AST reader when deserializing things that might interest
64 /// the consumer. The default implementation forwards to HandleTopLevelDecl.
65 virtual void HandleInterestingDecl(DeclGroupRef D);
67 /// HandleTranslationUnit - This method is called when the ASTs for entire
68 /// translation unit have been parsed.
69 virtual void HandleTranslationUnit(ASTContext &Ctx) {}
71 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
72 /// (e.g. struct, union, enum, class) is completed. This allows the client to
73 /// hack on the type, which can occur at any point in the file (because these
74 /// can be defined in declspecs).
75 virtual void HandleTagDeclDefinition(TagDecl *D) {}
77 /// \brief This callback is invoked the first time each TagDecl is required to
79 virtual void HandleTagDeclRequiredDefinition(const TagDecl *D) {}
81 /// \brief Invoked when a function is implicitly instantiated.
82 /// Note that at this point point it does not have a body, its body is
83 /// instantiated at the end of the translation unit and passed to
84 /// HandleTopLevelDecl.
85 virtual void HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) {}
87 /// \brief Handle the specified top-level declaration that occurred inside
88 /// and ObjC container.
89 /// The default implementation ignored them.
90 virtual void HandleTopLevelDeclInObjCContainer(DeclGroupRef D);
92 /// \brief Handle an ImportDecl that was implicitly created due to an
93 /// inclusion directive.
94 /// The default implementation passes it to HandleTopLevelDecl.
95 virtual void HandleImplicitImportDecl(ImportDecl *D);
97 /// \brief Handle a pragma that appends to Linker Options. Currently this
98 /// only exists to support Microsoft's #pragma comment(linker, "/foo").
99 virtual void HandleLinkerOptionPragma(llvm::StringRef Opts) {}
101 /// \brief Handle a pragma that emits a mismatch identifier and value to the
102 /// object file for the linker to work with. Currently, this only exists to
103 /// support Microsoft's #pragma detect_mismatch.
104 virtual void HandleDetectMismatch(llvm::StringRef Name,
105 llvm::StringRef Value) {}
107 /// \brief Handle a dependent library created by a pragma in the source.
108 /// Currently this only exists to support Microsoft's
109 /// #pragma comment(lib, "/foo").
110 virtual void HandleDependentLibrary(llvm::StringRef Lib) {}
112 /// CompleteTentativeDefinition - Callback invoked at the end of a translation
113 /// unit to notify the consumer that the given tentative definition should be
116 /// The variable declaration itself will be a tentative
117 /// definition. If it had an incomplete array type, its type will
118 /// have already been changed to an array of size 1. However, the
119 /// declaration remains a tentative definition and has not been
120 /// modified by the introduction of an implicit zero initializer.
121 virtual void CompleteTentativeDefinition(VarDecl *D) {}
123 /// HandleCXXStaticMemberVarInstantiation - Tell the consumer that this
124 // variable has been instantiated.
125 virtual void HandleCXXStaticMemberVarInstantiation(VarDecl *D) {}
127 /// \brief Callback involved at the end of a translation unit to
128 /// notify the consumer that a vtable for the given C++ class is
131 /// \param RD The class whose vtable was used.
132 virtual void HandleVTable(CXXRecordDecl *RD) {}
134 /// \brief If the consumer is interested in entities getting modified after
135 /// their initial creation, it should return a pointer to
136 /// an ASTMutationListener here.
137 virtual ASTMutationListener *GetASTMutationListener() { return nullptr; }
139 /// \brief If the consumer is interested in entities being deserialized from
140 /// AST files, it should return a pointer to a ASTDeserializationListener here
141 virtual ASTDeserializationListener *GetASTDeserializationListener() {
145 /// PrintStats - If desired, print any statistics.
146 virtual void PrintStats() {}
148 /// \brief This callback is called for each function if the Parser was
149 /// initialized with \c SkipFunctionBodies set to \c true.
151 /// \return \c true if the function's body should be skipped. The function
152 /// body may be parsed anyway if it is needed (for instance, if it contains
153 /// the code completion point or is constexpr).
154 virtual bool shouldSkipFunctionBody(Decl *D) { return true; }
157 } // end namespace clang.