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//===--- ASTConsumer.h - Abstract interface for reading ASTs ----*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file defines the ASTConsumer class.
namespace clang {
class ASTContext;
class CXXMethodDecl;
class CXXRecordDecl;
class Decl;
class DeclGroupRef;
class ASTMutationListener;
class ASTDeserializationListener; // layering violation because void* is ugly
class SemaConsumer; // layering violation required for safe SemaConsumer
class TagDecl;
class VarDecl;
class FunctionDecl;
class ImportDecl;
/// ASTConsumer - This is an abstract interface that should be implemented by
/// clients that read ASTs. This abstraction layer allows the client to be
/// independent of the AST producer (e.g. parser vs AST dump file reader, etc).
class ASTConsumer {
/// \brief Whether this AST consumer also requires information about
/// semantic analysis.
bool SemaConsumer;
friend class SemaConsumer;
ASTConsumer() : SemaConsumer(false) { }
virtual ~ASTConsumer() {}
/// Initialize - This is called to initialize the consumer, providing the
/// ASTContext.
virtual void Initialize(ASTContext &Context) {}
/// HandleTopLevelDecl - Handle the specified top-level declaration. This is
/// called by the parser to process every top-level Decl*.
/// \returns true to continue parsing, or false to abort parsing.
virtual bool HandleTopLevelDecl(DeclGroupRef D);
/// \brief This callback is invoked each time an inline (method or friend)
/// function definition in a class is completed.
virtual void HandleInlineFunctionDefinition(FunctionDecl *D) {}
/// HandleInterestingDecl - Handle the specified interesting declaration. This
/// is called by the AST reader when deserializing things that might interest
/// the consumer. The default implementation forwards to HandleTopLevelDecl.
virtual void HandleInterestingDecl(DeclGroupRef D);
/// HandleTranslationUnit - This method is called when the ASTs for entire
/// translation unit have been parsed.
virtual void HandleTranslationUnit(ASTContext &Ctx) {}
/// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
/// (e.g. struct, union, enum, class) is completed. This allows the client to
/// hack on the type, which can occur at any point in the file (because these
/// can be defined in declspecs).
virtual void HandleTagDeclDefinition(TagDecl *D) {}
/// \brief This callback is invoked the first time each TagDecl is required to
/// be complete.
virtual void HandleTagDeclRequiredDefinition(const TagDecl *D) {}
/// \brief Invoked when a function is implicitly instantiated.
/// Note that at this point point it does not have a body, its body is
/// instantiated at the end of the translation unit and passed to
/// HandleTopLevelDecl.
virtual void HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) {}
/// \brief Handle the specified top-level declaration that occurred inside
/// and ObjC container.
/// The default implementation ignored them.
virtual void HandleTopLevelDeclInObjCContainer(DeclGroupRef D);
/// \brief Handle an ImportDecl that was implicitly created due to an
/// inclusion directive.
/// The default implementation passes it to HandleTopLevelDecl.
virtual void HandleImplicitImportDecl(ImportDecl *D);
/// CompleteTentativeDefinition - Callback invoked at the end of a translation
/// unit to notify the consumer that the given tentative definition should be
/// completed.
/// The variable declaration itself will be a tentative
/// definition. If it had an incomplete array type, its type will
/// have already been changed to an array of size 1. However, the
/// declaration remains a tentative definition and has not been
/// modified by the introduction of an implicit zero initializer.
virtual void CompleteTentativeDefinition(VarDecl *D) {}
/// \brief Callback invoked when an MSInheritanceAttr has been attached to a
/// CXXRecordDecl.
virtual void AssignInheritanceModel(CXXRecordDecl *RD) {}
/// HandleCXXStaticMemberVarInstantiation - Tell the consumer that this
// variable has been instantiated.
virtual void HandleCXXStaticMemberVarInstantiation(VarDecl *D) {}
/// \brief Callback involved at the end of a translation unit to
/// notify the consumer that a vtable for the given C++ class is
/// required.
/// \param RD The class whose vtable was used.
virtual void HandleVTable(CXXRecordDecl *RD) {}
/// \brief If the consumer is interested in entities getting modified after
/// their initial creation, it should return a pointer to
/// an ASTMutationListener here.
virtual ASTMutationListener *GetASTMutationListener() { return nullptr; }
/// \brief If the consumer is interested in entities being deserialized from
/// AST files, it should return a pointer to a ASTDeserializationListener here
virtual ASTDeserializationListener *GetASTDeserializationListener() {
return nullptr;
/// PrintStats - If desired, print any statistics.
virtual void PrintStats() {}
/// \brief This callback is called for each function if the Parser was
/// initialized with \c SkipFunctionBodies set to \c true.
/// \return \c true if the function's body should be skipped. The function
/// body may be parsed anyway if it is needed (for instance, if it contains
/// the code completion point or is constexpr).
virtual bool shouldSkipFunctionBody(Decl *D) { return true; }
} // end namespace clang.