source: src/SymTab/Indexer.h@ 1ccc599

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// Indexer.h --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 21:38:55 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Aug 17 16:09:12 2017
// Update Count     : 8
//

#pragma once

#include <iosfwd>             // for ostream
#include <list>               // for list
#include <string>             // for string
#include <functional>         // for function

#include "SynTree/Visitor.h"  // for Visitor
#include "SynTree/SynTree.h"  // for AST nodes

namespace SymTab {
        class Indexer {
          public:
                explicit Indexer();

                Indexer( const Indexer &that );
                Indexer( Indexer &&that );
                virtual ~Indexer();
                Indexer& operator= ( const Indexer &that );
                Indexer& operator= ( Indexer &&that );

                // when using an indexer manually (e.g., within a mutator traversal), it is necessary to tell the indexer
                // explicitly when scopes begin and end
                void enterScope();
                void leaveScope();

                struct IdData {
                        DeclarationWithType * id = nullptr;
                        Expression * baseExpr = nullptr; // WithExpr

                        /// non-null if this declaration is deleted
                        BaseSyntaxNode * deleteStmt = nullptr;

                        // NOTE: shouldn't need either of these constructors, but gcc-4 does not properly support initializer lists with default members.
                        IdData() = default;
                        IdData( DeclarationWithType * id, Expression * baseExpr, BaseSyntaxNode * deleteStmt ) : id( id ), baseExpr( baseExpr ), deleteStmt( deleteStmt ) {}

                        Expression * combine() const;
                };

                /// Gets all declarations with the given ID
                void lookupId( const std::string &id, std::list< IdData > &out ) const;
                /// Gets the top-most type declaration with the given ID
                NamedTypeDecl *lookupType( const std::string &id ) const;
                /// Gets the top-most struct declaration with the given ID
                StructDecl *lookupStruct( const std::string &id ) const;
                /// Gets the top-most enum declaration with the given ID
                EnumDecl *lookupEnum( const std::string &id ) const;
                /// Gets the top-most union declaration with the given ID
                UnionDecl *lookupUnion( const std::string &id ) const;
                /// Gets the top-most trait declaration with the given ID
                TraitDecl *lookupTrait( const std::string &id ) const;

                void print( std::ostream &os, int indent = 0 ) const;

                /// looks up a specific mangled ID at the given scope
                IdData * lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope );
                const IdData * lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope ) const;
                /// returns true if there exists a declaration with C linkage and the given name with a different mangled name
                bool hasIncompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const;
                /// returns true if there exists a declaration with C linkage and the given name with the same mangled name
                bool hasCompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const;
                // equivalents to lookup functions that only look at tables at scope `scope` (which should be >= tables->scope)
                NamedTypeDecl *lookupTypeAtScope( const std::string &id, unsigned long scope ) const;
                StructDecl *lookupStructAtScope( const std::string &id, unsigned long scope ) const;
                EnumDecl *lookupEnumAtScope( const std::string &id, unsigned long scope ) const;
                UnionDecl *lookupUnionAtScope( const std::string &id, unsigned long scope ) const;
                TraitDecl *lookupTraitAtScope( const std::string &id, unsigned long scope ) const;

                typedef std::function<bool(IdData &, const std::string &)> ConflictFunction;

                void addId( DeclarationWithType * decl, Expression * baseExpr = nullptr );
                void addDeletedId( DeclarationWithType * decl, BaseSyntaxNode * deleteStmt );

                void addType( NamedTypeDecl *decl );
                void addStruct( const std::string &id );
                void addStruct( StructDecl *decl );
                void addEnum( EnumDecl *decl );
                void addUnion( const std::string &id );
                void addUnion( UnionDecl *decl );
                void addTrait( TraitDecl *decl );

                /// adds all of the IDs from WithStmt exprs
                void addWith( std::list< Expression * > & withExprs, BaseSyntaxNode * withStmt );

                /// adds all of the members of the Aggregate (addWith helper)
                void addMembers( AggregateDecl * aggr, Expression * expr, ConflictFunction );

                /// convenience function for adding a list of Ids to the indexer
                void addIds( const std::list< DeclarationWithType * > & decls );

                /// convenience function for adding a list of forall parameters to the indexer
                void addTypes( const std::list< TypeDecl * > & tds );

                /// convenience function for adding all of the declarations in a function type to the indexer
                void addFunctionType( FunctionType * ftype );

                bool doDebug = false; ///< Display debugging trace?
          private:
                struct Impl;

                Impl *tables;         ///< Copy-on-write instance of table data structure
                unsigned long scope;  ///< Scope index of this pointer

                /// Takes a new ref to a table (returns null if null)
                static Impl *newRef( Impl *toClone );
                /// Clears a ref to a table (does nothing if null)
                static void deleteRef( Impl *toFree );

                // Removes matching autogenerated constructors and destructors
                // so that they will not be selected
                // void removeSpecialOverrides( FunctionDecl *decl );
                void removeSpecialOverrides( const std::string &id, std::list< IdData > & out ) const;

                /// Ensures that tables variable is writable (i.e. allocated, uniquely owned by this Indexer, and at the current scope)
                void makeWritable();

                /// common code for addId, addDeletedId, etc.
                void addId( DeclarationWithType * decl, ConflictFunction, Expression * baseExpr = nullptr, BaseSyntaxNode * deleteStmt = nullptr );
        };
} // namespace SymTab

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //