source: src/ResolvExpr/Unify.h @ 5c6afcd

//
// 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.
//
// Unify.h -- 
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 13:09:04 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Sun May 17 13:10:34 2015
// Update Count     : 2
//

#ifndef UNIFY_H
#define UNIFY_H

#include <map>
#include <list>
#include "SynTree/SynTree.h"
#include "SynTree/Type.h"
#include "SynTree/Declaration.h"
#include "SymTab/Indexer.h"
#include "TypeEnvironment.h"
#include "Common/utility.h"

namespace ResolvExpr {
        struct WidenMode {
                WidenMode( bool widenFirst, bool widenSecond ): widenFirst( widenFirst ), widenSecond( widenSecond ) {}
                WidenMode &operator|=( const WidenMode &other ) { widenFirst |= other.widenFirst; widenSecond |= other.widenSecond; return *this; }
                WidenMode &operator&=( const WidenMode &other ) { widenFirst &= other.widenFirst; widenSecond &= other.widenSecond; return *this; }
                WidenMode operator|( const WidenMode &other ) { WidenMode newWM( *this ); newWM |= other; return newWM; }
                WidenMode operator&( const WidenMode &other ) { WidenMode newWM( *this ); newWM &= other; return newWM; }
                operator bool() { return widenFirst && widenSecond; }

                bool widenFirst : 1, widenSecond : 1;
        };
        
        bool bindVar( TypeInstType *typeInst, Type *other, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer );
        bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer );
        bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType );
        bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer );

        template< typename Iterator1, typename Iterator2 >
        bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, std::list< Type* > &commonTypes ) {
                for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) {
                        Type *commonType = 0;
                        if ( ! unify( *list1Begin, *list2Begin, env, needAssertions, haveAssertions, openVars, indexer, commonType ) ) {
                                return false;
                        } // if
                        commonTypes.push_back( commonType );
                } // for
                if ( list1Begin != list1End || list2Begin != list2End ) {
                        return false;
                } else {
                        return true;
                } // if
        }

        template< typename Iterator1, typename Iterator2 >
        bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) {
                std::list< Type* > commonTypes;
                if ( unifyList( list1Begin, list1End, list2Begin, list2End, env, needAssertions, haveAssertions, openVars, indexer, commonTypes ) ) {
                        deleteAll( commonTypes );
                        return true;
                } else {
                        return false;
                } // if
        }

} // namespace ResolvExpr

#endif // UNIFY_H

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