source: src/ResolvExpr/PolyCost.cc @ 96ac72c

//
// 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.
//
// PolyCost.cc --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 09:50:12 2015
// Last Modified By : Andrew Beach
// Last Modified On : Wed Jun 19 10:45:00 2019
// Update Count     : 4
//

#include "AST/SymbolTable.hpp"
#include "AST/Type.hpp"
#include "AST/TypeEnvironment.hpp"
#include "Common/PassVisitor.h"
#include "SymTab/Indexer.h"   // for Indexer
#include "SynTree/Type.h"     // for TypeInstType, Type
#include "TypeEnvironment.h"  // for EqvClass, TypeEnvironment

namespace ResolvExpr {
        struct PolyCost {
                PolyCost( const TypeEnvironment &env, const SymTab::Indexer &indexer );

                void previsit( TypeInstType * aggregateUseType );
                int result;
                const TypeEnvironment &tenv;
                const SymTab::Indexer &indexer;
        };

        int polyCost( Type *type, const TypeEnvironment & env, const SymTab::Indexer &indexer ) {
                PassVisitor<PolyCost> coster( env, indexer );
                type->accept( coster );
                return coster.pass.result;
        }

        PolyCost::PolyCost( const TypeEnvironment & env, const SymTab::Indexer & indexer ) : result( 0 ), tenv( env ), indexer( indexer ) {
        }

        void PolyCost::previsit(TypeInstType * typeInst) {
                if ( const EqvClass *eqvClass = tenv.lookup( typeInst->name ) ) {
                        if ( eqvClass->type ) {
                                if ( TypeInstType * otherTypeInst = dynamic_cast< TypeInstType* >( eqvClass->type ) ) {
                                        if ( indexer.lookupType( otherTypeInst->name ) ) {
                                                // bound to opaque type
                                                result += 1;
                                        } // if
                                } else {
                                        // bound to concrete type
                                        result += 1;
                                } // if
                        } // if
                } // if
        }

// TODO: When the old PolyCost is torn out get rid of the _new suffix.
class PolyCost_new {
        const ast::SymbolTable &symtab;
public:
        int result;
        const ast::TypeEnvironment &env_;

        PolyCost_new( const ast::SymbolTable & symtab, const ast::TypeEnvironment & env ) 
        : symtab( symtab ), result( 0 ), env_( env ) {}

        void previsit( const ast::TypeInstType * type ) {
                if ( const ast::EqvClass * eqv = env_.lookup( type->name ) ) /* && */ if ( eqv->bound ) {
                        if ( const ast::TypeInstType * otherType = eqv->bound.as< ast::TypeInstType >() ) {
                                if ( symtab.lookupType( otherType->name ) ) {
                                        // Bound to opaque type.
                                        result += 1;
                                }
                        } else {
                                // Bound to concrete type.
                                result += 1;
                        }
                }
        }
};

int polyCost(
        const ast::Type * type, const ast::SymbolTable & symtab, const ast::TypeEnvironment & env
) {
        ast::Pass<PolyCost_new> costing( symtab, env );
        type->accept( costing );
        return costing.pass.result;
}

} // namespace ResolvExpr

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