source: src/GenPoly/GenPoly.cc @ be945ac

//
// 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.
//
// GenPoly.cc --
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Rob Schluntz
// Last Modified On : Wed May 25 13:39:21 2016
// Update Count     : 13
//

#include "GenPoly.h"

#include "SynTree/Expression.h"
#include "SynTree/Type.h"

#include <iostream>
using namespace std;

namespace GenPoly {
        bool needsAdapter( FunctionType *adaptee, const TyVarMap &tyVars ) {
                if ( ! adaptee->get_returnVals().empty() && isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
                        return true;
                } // if
                for ( std::list< DeclarationWithType* >::const_iterator innerArg = adaptee->get_parameters().begin(); innerArg != adaptee->get_parameters().end(); ++innerArg ) {
                        if ( isPolyType( (*innerArg)->get_type(), tyVars ) ) {
                                return true;
                        } // if
                } // for
                return false;
        }

        ReferenceToType *isPolyRet( FunctionType *function ) {
                if ( ! function->get_returnVals().empty() ) {
                        TyVarMap forallTypes( (TypeDecl::Kind)-1 );
                        makeTyVarMap( function, forallTypes );
                        return (ReferenceToType*)isPolyType( function->get_returnVals().front()->get_type(), forallTypes );
                } // if
                return 0;
        }

        namespace {
                /// Checks a parameter list for polymorphic parameters; will substitute according to env if present
                bool hasPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
                        for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
                                TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
                                assert(paramType && "Aggregate parameters should be type expressions");
                                if ( isPolyType( paramType->get_type(), env ) ) return true;
                        }
                        return false;
                }

                /// Checks a parameter list for polymorphic parameters from tyVars; will substitute according to env if present
                bool hasPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
                        for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
                                TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
                                assert(paramType && "Aggregate parameters should be type expressions");
                                if ( isPolyType( paramType->get_type(), tyVars, env ) ) return true;
                        }
                        return false;
                }

                /// Replaces a TypeInstType by its referrent in the environment, if applicable
                Type* replaceTypeInst( Type* type, const TypeSubstitution* env ) {
                        if ( ! env ) return type;
                        if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) {
                                Type *newType = env->lookup( typeInst->get_name() );
                                if ( newType ) return newType;
                        }
                        return type;
                }
        }

        Type *isPolyType( Type *type, const TypeSubstitution *env ) {
                type = replaceTypeInst( type, env );

                if ( TypeInstType *typeInst = dynamic_cast< TypeInstType * >( type ) ) {
                        return type;
                } else if ( StructInstType *structType = dynamic_cast< StructInstType* >( type ) ) {
                        if ( hasPolyParams( structType->get_parameters(), env ) ) return type;
                } else if ( UnionInstType *unionType = dynamic_cast< UnionInstType* >( type ) ) {
                        if ( hasPolyParams( unionType->get_parameters(), env ) ) return type;
                }
                return 0;
        }

        Type *isPolyType( Type *type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
                type = replaceTypeInst( type, env );

                if ( TypeInstType *typeInst = dynamic_cast< TypeInstType * >( type ) ) {
                        if ( tyVars.find( typeInst->get_name() ) != tyVars.end() ) {
                                return type;
                        }
                } else if ( StructInstType *structType = dynamic_cast< StructInstType* >( type ) ) {
                        if ( hasPolyParams( structType->get_parameters(), tyVars, env ) ) return type;
                } else if ( UnionInstType *unionType = dynamic_cast< UnionInstType* >( type ) ) {
                        if ( hasPolyParams( unionType->get_parameters(), tyVars, env ) ) return type;
                }
                return 0;
        }

        Type *isPolyPtr( Type *type, const TypeSubstitution *env ) {
                type = replaceTypeInst( type, env );

                if ( PointerType *ptr = dynamic_cast< PointerType *>( type ) ) {
                        return isPolyType( ptr->get_base(), env );
                }
                return 0;
        }

        Type *isPolyPtr( Type *type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
                type = replaceTypeInst( type, env );

                if ( PointerType *ptr = dynamic_cast< PointerType *>( type ) ) {
                        return isPolyType( ptr->get_base(), tyVars, env );
                }
                return 0;
        }

        Type * hasPolyBase( Type *type, int *levels, const TypeSubstitution *env ) {
                int dummy;
                if ( ! levels ) { levels = &dummy; }
                *levels = 0;

                while ( true ) {
                        type = replaceTypeInst( type, env );

                        if ( PointerType *ptr = dynamic_cast< PointerType *>( type ) ) {
                                type = ptr->get_base();
                                ++(*levels);
                        } else break;
                }

                return isPolyType( type, env );
        }

        Type * hasPolyBase( Type *type, const TyVarMap &tyVars, int *levels, const TypeSubstitution *env ) {
                int dummy;
                if ( ! levels ) { levels = &dummy; }
                *levels = 0;

                while ( true ) {
                        type = replaceTypeInst( type, env );

                        if ( PointerType *ptr = dynamic_cast< PointerType *>( type ) ) {
                                type = ptr->get_base();
                                ++(*levels);
                        } else break;
                }

                return isPolyType( type, tyVars, env );
        }

        FunctionType * getFunctionType( Type *ty ) {
                PointerType *ptrType;
                if ( ( ptrType = dynamic_cast< PointerType* >( ty ) ) ) {
                        return dynamic_cast< FunctionType* >( ptrType->get_base() ); // pointer if FunctionType, NULL otherwise
                } else {
                        return dynamic_cast< FunctionType* >( ty ); // pointer if FunctionType, NULL otherwise
                }
        }

        VariableExpr * getBaseVar( Expression *expr, int *levels ) {
                int dummy;
                if ( ! levels ) { levels = &dummy; }
                *levels = 0;

                while ( true ) {
                        if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( expr ) ) {
                                return varExpr;
                        } else if ( MemberExpr *memberExpr = dynamic_cast< MemberExpr* >( expr ) ) {
                                expr = memberExpr->get_aggregate();
                        } else if ( AddressExpr *addressExpr = dynamic_cast< AddressExpr* >( expr ) ) {
                                expr = addressExpr->get_arg();
                        } else if ( UntypedExpr *untypedExpr = dynamic_cast< UntypedExpr* >( expr ) ) {
                                // look for compiler-inserted dereference operator
                                NameExpr *fn = dynamic_cast< NameExpr* >( untypedExpr->get_function() );
                                if ( ! fn || fn->get_name() != std::string("*?") ) return 0;
                                expr = *untypedExpr->begin_args();
                        } else if ( CommaExpr *commaExpr = dynamic_cast< CommaExpr* >( expr ) ) {
                                // copy constructors insert comma exprs, look at second argument which contains the variable
                                expr = commaExpr->get_arg2();
                                continue;
                        } else break;

                        ++(*levels);
                }

                return 0;
        }

        void makeTyVarMap( Type *type, TyVarMap &tyVarMap ) {
                for ( std::list< TypeDecl* >::const_iterator tyVar = type->get_forall().begin(); tyVar != type->get_forall().end(); ++tyVar ) {
                        assert( *tyVar );
                        tyVarMap[ (*tyVar)->get_name() ] = (*tyVar)->get_kind();
                }
                if ( PointerType *pointer = dynamic_cast< PointerType* >( type ) ) {
                        makeTyVarMap( pointer->get_base(), tyVarMap );
                }
        }

        void printTyVarMap( std::ostream &os, const TyVarMap &tyVarMap ) {
                for ( TyVarMap::const_iterator i = tyVarMap.begin(); i != tyVarMap.end(); ++i ) {
                        os << i->first << " (" << i->second << ") ";
                } // for
                os << std::endl;
        }

} // namespace GenPoly

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