source: src/ResolvExpr/TypeEnvironment.cc@ 906e24d

//
// 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.
//
// TypeEnvironment.cc --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 12:19:47 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Sun May 17 12:23:36 2015
// Update Count     : 3
//

#include <algorithm>
#include <iterator>

#include "TypeEnvironment.h"
#include "SynTree/Type.h"
#include "SynTree/TypeSubstitution.h"
#include "Common/utility.h"

namespace ResolvExpr {
        // adding this comparison operator significantly improves assertion resolution run time for
        // some cases. The current resolution algorithm's speed partially depends on the order of
        // assertions. Assertions which have fewer possible matches should appear before
        // assertions which have more possible matches. This seems to imply that this could
        // be further improved by providing an indexer as an additional argument and ordering based
        // on the number of matches of the same kind (object, function) for the names of the
        // declarations.
        //
        // I've seen a TU go from 54 minutes to 1 minute 34 seconds with the addition of this comparator.
        bool AssertCompare::operator()( DeclarationWithType * d1, DeclarationWithType * d2 ) {
                        // Objects are always less than functions
                        if ( ObjectDecl * objectDecl1 = dynamic_cast< ObjectDecl * >( d1 ) ) {
                                if ( ObjectDecl * objectDecl2 = dynamic_cast< ObjectDecl * >( d2 ) ) {
                                        // objects are ordered by name then type pointer, in that order
                                        int cmp = objectDecl1->get_name().compare( objectDecl2->get_name() );
                                        return cmp < 0 ||
                                                ( cmp == 0 && objectDecl1->get_type() < objectDecl2->get_type() );
                                } else {
                                        return true;
                                }
                        } else if ( FunctionDecl * funcDecl1 = dynamic_cast< FunctionDecl * >( d1 ) ) {
                                if ( FunctionDecl * funcDecl2 = dynamic_cast< FunctionDecl * >( d2 ) ) {
                                        // functions are ordered by name, # parameters, # returnVals, type pointer in that order
                                        FunctionType * ftype1 = funcDecl1->get_functionType();
                                        FunctionType * ftype2 = funcDecl2->get_functionType();
                                        int numThings1 = ftype1->get_parameters().size() + ftype1->get_returnVals().size();
                                        int numThings2 = ftype2->get_parameters().size() + ftype2->get_returnVals().size();
                                        if ( numThings1 < numThings2 ) return true;
                                        if ( numThings1 > numThings2 ) return false;

                                        // if ( ftype1->get_parameters().size() < ftype2->get_parameters().size() ) return true;
                                        // else if ( ftype1->get_parameters().size() > ftype2->get_parameters().size() ) return false;
                                        // // same number of parameters
                                        // if ( ftype1->get_returnVals().size() < ftype2->get_returnVals().size() ) return true;
                                        // else if ( ftype1->get_returnVals().size() > ftype2->get_returnVals().size() ) return false;
                                        // same number of return vals
                                        // int cmp = funcDecl1->get_name().compare( funcDecl2->get_name() );
                                        // if ( cmp < 0 ) return true;
                                        // else if ( cmp > 0 ) return false;
                                        // // same name
                                        return ftype1 < ftype2;
                                } else {
                                        return false;
                                }
                        } else {
                                assert( false );
                        }
                }

        void printAssertionSet( const AssertionSet &assertions, std::ostream &os, int indent ) {
                for ( AssertionSet::const_iterator i = assertions.begin(); i != assertions.end(); ++i ) {
                        i->first->print( os, indent );
                        if ( i->second ) {
                                os << "(used)";
                        } else {
                                os << "(not used)";
                        } // if
                } // for
        }

        void printOpenVarSet( const OpenVarSet &openVars, std::ostream &os, int indent ) {
                os << std::string( indent, ' ' );
                for ( OpenVarSet::const_iterator i = openVars.begin(); i != openVars.end(); ++i ) {
                        os << i->first << "(" << i->second << ") ";
                } // for
        }

        void EqvClass::initialize( const EqvClass &src, EqvClass &dest ) {
                dest.vars = src.vars;
                dest.type = maybeClone( src.type );
                dest.allowWidening = src.allowWidening;
                dest.kind = src.kind;
        }

        EqvClass::EqvClass() : type( 0 ), allowWidening( true ) {
        }

        EqvClass::EqvClass( const EqvClass &other ) {
                initialize( other, *this );
        }

        EqvClass &EqvClass::operator=( const EqvClass &other ) {
                if ( this == &other ) return *this;
                delete type;
                initialize( other, *this );
                return *this;
        }

        EqvClass::~EqvClass() {
                delete type;
        }

        void EqvClass::print( std::ostream &os, int indent ) const {
                os << std::string( indent, ' ' ) << "( ";
                std::copy( vars.begin(), vars.end(), std::ostream_iterator< std::string >( os, " " ) );
                os << ")";
                if ( type ) {
                        os << " -> ";
                        type->print( os, indent );
                } // if
                if ( ! allowWidening ) {
                        os << " (no widening)";
                } // if
                os << std::endl;
        }

        bool TypeEnvironment::lookup( const std::string &var, EqvClass &eqvClass ) const {
                for ( std::list< EqvClass >::const_iterator i = env.begin(); i != env.end(); ++i ) {
                        if ( i->vars.find( var ) != i->vars.end() ) {
///       std::cout << var << " is in class ";
///       i->print( std::cout );
                                eqvClass = *i;
                                return true;
                        }
///     std::cout << var << " is not in class ";
///     i->print( std::cout );
                } // for
                return false;
        }

        void TypeEnvironment::add( const EqvClass &eqvClass ) {
                std::list< EqvClass >::iterator i = env.begin();
                while ( i != env.end() ) {
                        std::list< EqvClass >::iterator next = i;
                        next++;
                        std::set< std::string > intersection;
                        std::set_intersection( i->vars.begin(), i->vars.end(), eqvClass.vars.begin(), eqvClass.vars.end(), std::inserter( intersection, intersection.begin() ) );
                        if ( ! intersection.empty() ) {
                                env.erase( i );
                        } // if
                        i = next;
                } // while
                env.insert( env.end(), eqvClass );
        }

        void TypeEnvironment::add( const std::list< TypeDecl* > &tyDecls ) {
                for ( std::list< TypeDecl* >::const_iterator i = tyDecls.begin(); i != tyDecls.end(); ++i ) {
                        EqvClass newClass;
                        newClass.vars.insert( (*i)->get_name() );
                        newClass.kind = (*i)->get_kind();
                        env.push_back( newClass );
                } // for
        }

        void TypeEnvironment::makeSubstitution( TypeSubstitution &sub ) const {
                for ( std::list< EqvClass >::const_iterator theClass = env.begin(); theClass != env.end(); ++theClass ) {
                        for ( std::set< std::string >::const_iterator theVar = theClass->vars.begin(); theVar != theClass->vars.end(); ++theVar ) {
///       std::cout << "adding " << *theVar;
                                if ( theClass->type ) {
///         std::cout << " bound to ";
///         theClass->type->print( std::cout );
///         std::cout << std::endl;
                                        sub.add( *theVar, theClass->type );
                                } else if ( theVar != theClass->vars.begin() ) {
                                        TypeInstType *newTypeInst = new TypeInstType( Type::Qualifiers(), *theClass->vars.begin(), theClass->kind == TypeDecl::Ftype );
///         std::cout << " bound to variable " << *theClass->vars.begin() << std::endl;
                                        sub.add( *theVar, newTypeInst );
                                        delete newTypeInst;
                                } // if
                        } // for
                } // for
///   std::cerr << "input env is:" << std::endl;
///   print( std::cerr, 8 );
///   std::cerr << "sub is:" << std::endl;
///   sub.print( std::cerr, 8 );
                sub.normalize();
        }

        void TypeEnvironment::print( std::ostream &os, int indent ) const {
                for ( std::list< EqvClass >::const_iterator i = env.begin(); i != env.end(); ++i ) {
                        i->print( os, indent );
                } // for
        }

        std::list< EqvClass >::iterator TypeEnvironment::internal_lookup( const std::string &var ) {
                for ( std::list< EqvClass >::iterator i = env.begin(); i != env.end(); ++i ) {
                        if ( i->vars.find( var ) == i->vars.end() ) {
                                return i;
                        } // if
                } // for
                return env.end();
        }

        void TypeEnvironment::simpleCombine( const TypeEnvironment &second ) {
                env.insert( env.end(), second.env.begin(), second.env.end() );
        }

        void TypeEnvironment::combine( const TypeEnvironment &second, Type *(*combineFunc)( Type*, Type* ) ) {
                TypeEnvironment secondCopy( second );
                for ( std::list< EqvClass >::iterator firstClass = env.begin(); firstClass != env.end(); ++firstClass ) {
                        EqvClass &newClass = *firstClass;
                        std::set< std::string > newVars;
                        for ( std::set< std::string >::const_iterator var = firstClass->vars.begin(); var != firstClass->vars.end(); ++var ) {
                                std::list< EqvClass >::iterator secondClass = secondCopy.internal_lookup( *var );
                                if ( secondClass != secondCopy.env.end() ) {
                                        newVars.insert( secondClass->vars.begin(), secondClass->vars.end() );
                                        if ( secondClass->type ) {
                                                if ( newClass.type ) {
                                                        Type *newType = combineFunc( newClass.type, secondClass->type );
                                                        delete newClass.type;
                                                        newClass.type = newType;
                                                        newClass.allowWidening = newClass.allowWidening && secondClass->allowWidening;
                                                } else {
                                                        newClass.type = secondClass->type->clone();
                                                        newClass.allowWidening = secondClass->allowWidening;
                                                } // if
                                        } // if
                                        secondCopy.env.erase( secondClass );
                                } // if
                        } // for
                        newClass.vars.insert( newVars.begin(), newVars.end() );
                } // for
                for ( std::list< EqvClass >::iterator secondClass = secondCopy.env.begin(); secondClass != secondCopy.env.end(); ++secondClass ) {
                        env.push_back( *secondClass );
                } // for
        }

        void TypeEnvironment::extractOpenVars( OpenVarSet &openVars ) const {
                for ( std::list< EqvClass >::const_iterator eqvClass = env.begin(); eqvClass != env.end(); ++eqvClass ) {
                        for ( std::set< std::string >::const_iterator var = eqvClass->vars.begin(); var != eqvClass->vars.end(); ++var ) {
                                openVars[ *var ] = eqvClass->kind;
                        } // for
                } // for
        }

} // namespace ResolvExpr

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