source: src/Tuples/FunctionFixer.cc @ 7528ba1

//
// 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.
//
// FunctionFixer.cc -- 
//
// Author           : Rodolfo G. Esteves
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Mon May 18 12:02:22 2015
// Update Count     : 1
//

#include <list>
#include <vector>
#include <cassert>
#include <algorithm>

#include "FunctionFixer.h"

namespace Tuples {
        DeclarationWithType *FunctionFixer::mutate( FunctionDecl *functionDecl ) {
                functionDecl->set_functionType( maybeMutate( functionDecl->get_functionType(), *this ) );
                mutateAll( functionDecl->get_oldDecls(), *this );
                functionDecl->set_statements( maybeMutate( functionDecl->get_statements(), *this ) );
                index.visit( functionDecl );
                rets.clear();
                return functionDecl;
        }

        Type *FunctionFixer::mutate( FunctionType *functionType ) {
                typedef std::list< DeclarationWithType * >  Decls;

                if ( functionType->get_returnVals().size() <= 1 )  return functionType;
                std::copy( functionType->get_returnVals().begin(), functionType->get_returnVals().end(), back_inserter(rets) );

                Type::Qualifiers qual;
                for ( Decls::iterator i = rets.begin(); i != rets.end(); i++ ) {
                        (*i)->set_type( new PointerType( qual, (*i)->get_type() ) );
                        functionType->get_parameters().push_back( *i );
                } // for

                functionType->get_returnVals() = *(new std::list< DeclarationWithType * >());

                functionType->set_isVarArgs( false );
                return functionType;
        }

        Statement *FunctionFixer::mutate( ReturnStmt *retStmt ) {
                bool tupleReturn = false;
                Expression *rhs = 0;
                // also check if returning multiple values
                if ( CastExpr *cst = dynamic_cast<CastExpr *>( retStmt->get_expr() ) ) {
                        if ( ApplicationExpr *app = dynamic_cast<ApplicationExpr *>( cst->get_arg() ) ) {
                                if ( app->get_results().size() > 1 ) { // doesn't need to be ApplicationExpr
                                        tupleReturn = true;
                                        rhs = app;
                                }
                        } else if ( TupleExpr *t = dynamic_cast<TupleExpr *>( cst->get_arg() ) ) {
                                tupleReturn = true;
                                assert( rets.size() == t->get_exprs().size() ); // stupid check, resolve expression
                                rhs = t;
                        } // if

                        if ( tupleReturn ) {
                                assert ( rhs != 0 );
                                std::list< Expression * > lhs;
                                for ( std::list< DeclarationWithType * >::iterator d = rets.begin(); d != rets.end(); ++d ) {
                                        std::list<Expression *> largs;
                                        largs.push_back(new VariableExpr( *d ));
                                        Expression *exp = ResolvExpr::resolveInVoidContext( new CastExpr( new UntypedExpr(new NameExpr("*?"), largs), (*d)->get_type()),
                                                                                                                                                index );
                                        lhs.push_back(exp);
                                } // for
                                std::list< Expression * > args;
                                TupleExpr *tlhs = new TupleExpr; tlhs->set_exprs( lhs );
                                args.push_back( new AddressExpr(tlhs) );
                                args.push_back(rhs);

                                return new ExprStmt( std::list< Label>(), new UntypedExpr( new NameExpr("?=?"), args ) );
                        } // if
                } // if
                /*
                  else
                  std::cerr << "Empty return statement" << std::endl;
                */

                return retStmt;
        }

        Expression* FunctionFixer::mutate( VariableExpr *variableExpr ) {
                if ( rets.empty() ) return variableExpr;
                mutateAll( variableExpr->get_results(), *this );
                if ( std::find( rets.begin(), rets.end(), variableExpr->get_var() ) != rets.end() )
//      if ( PointerType *ptr = dynamic_cast<PointerType *>(variableExpr->get_var()->get_type()) ) {
                        if ( dynamic_cast<PointerType *>(variableExpr->get_var()->get_type()) != 0 ) {
                                std::list<Expression *> largs;
                                largs.push_back( new AddressExpr(variableExpr) );
                                Expression *expr = ResolvExpr::resolveInVoidContext( /*new CastExpr(*/new UntypedExpr( new NameExpr( "*?" ), largs )/*,
                                                                                                                                                                                                                                                                          ptr->get_base()),*/, index);
                                if ( ApplicationExpr *app = dynamic_cast< ApplicationExpr * >( expr ) ) {
                                        assert( app->get_args().size() == 1 );
                                        app->get_args().pop_front();
                                        app->get_args().push_back( variableExpr );
                                        return app;
                                }
                        }
                return variableExpr;
        }

        /*
          Expression* FunctionFixer::mutate(ApplicationExpr *applicationExpr) {
          std::cerr << "In Application Expression" << std::endl;
          mutateAll( applicationExpr->get_results(), *this );
          applicationExpr->set_function(  maybeMutate( applicationExpr->get_function(), *this ) );
          mutateAll( applicationExpr->get_args(), *this );
          return applicationExpr;
          }
        */
} // namespace Tuples
// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //