source: src/ResolvExpr/PtrsCastable.cc @ 94980502

//
// 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.
//
// PtrsCastable.cc -- 
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 11:48:00 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Wed Mar  2 17:36:18 2016
// Update Count     : 8
//

#include "typeops.h"
#include "SynTree/Type.h"
#include "SynTree/Declaration.h"
#include "SynTree/Visitor.h"
#include "SymTab/Indexer.h"


namespace ResolvExpr {
        class PtrsCastable : public Visitor {
          public:
                PtrsCastable( Type *dest, const TypeEnvironment &env, const SymTab::Indexer &indexer );
  
                int get_result() const { return result; }

                virtual void visit(VoidType *voidType);
                virtual void visit(BasicType *basicType);
                virtual void visit(PointerType *pointerType);
                virtual void visit(ArrayType *arrayType);
                virtual void visit(FunctionType *functionType);
                virtual void visit(StructInstType *inst);
                virtual void visit(UnionInstType *inst);
                virtual void visit(EnumInstType *inst);
                virtual void visit(TraitInstType *inst);
                virtual void visit(TypeInstType *inst);
                virtual void visit(TupleType *tupleType);
                virtual void visit(VarArgsType *varArgsType);
          private:
                Type *dest;
                int result;
                const TypeEnvironment &env;
                const SymTab::Indexer &indexer;
        };

        int objectCast( Type *src, const TypeEnvironment &env, const SymTab::Indexer &indexer ) {
                if ( dynamic_cast< FunctionType* >( src ) ) {
                        return -1;
                } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( src ) ) {
                        EqvClass eqvClass;
                        if ( NamedTypeDecl *ntDecl = indexer.lookupType( typeInst->get_name() ) ) {
                                if ( TypeDecl *tyDecl = dynamic_cast< TypeDecl* >( ntDecl ) ) {
                                        if ( tyDecl->get_kind() == TypeDecl::Ftype ) {
                                                return -1;
                                        } // if
                                } //if
                        } else if ( env.lookup( typeInst->get_name(), eqvClass ) ) {
                                if ( eqvClass.kind == TypeDecl::Ftype ) {
                                        return -1;
                                } // if
                        } // if
                } //if
                return 1;
        }

        int ptrsCastable( Type *src, Type *dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ) {
                if ( TypeInstType *destAsTypeInst = dynamic_cast< TypeInstType* >( dest ) ) {
                        EqvClass eqvClass;
                        if ( env.lookup( destAsTypeInst->get_name(), eqvClass ) ) {
                                return ptrsAssignable( src, eqvClass.type, env );
                        } // if
                } // if
                if ( dynamic_cast< VoidType* >( dest ) ) {
                        return objectCast( src, env, indexer );
                } else {
                        PtrsCastable ptrs( dest, env, indexer );
                        src->accept( ptrs );
                        return ptrs.get_result();
                } // if
        }

        PtrsCastable::PtrsCastable( Type *dest, const TypeEnvironment &env, const SymTab::Indexer &indexer )
                : dest( dest ), result( 0 ), env( env ), indexer( indexer )     {
        }

        void PtrsCastable::visit(VoidType *voidType) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(BasicType *basicType) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(PointerType *pointerType) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(ArrayType *arrayType) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(FunctionType *functionType) {
                result = -1;
        }

        void PtrsCastable::visit(StructInstType *inst) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(UnionInstType *inst) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(EnumInstType *inst) {
                if ( dynamic_cast< EnumInstType* >( dest ) ) {
                        result = 1;
                } else if ( BasicType *bt = dynamic_cast< BasicType* >( dest ) ) {
                        if ( bt->get_kind() == BasicType::SignedInt ) {
                                result = 0;
                        } else {
                                result = 1;
                        }
                } else {
                        result = objectCast( dest, env, indexer );
                }
        }

        void PtrsCastable::visit(TraitInstType *inst) {
                // I definitely don't think we should be doing anything here
        }

        void PtrsCastable::visit(TypeInstType *inst) {
                result = objectCast( inst, env, indexer ) > 0 && objectCast( dest, env, indexer ) > 0 ? 1 : -1;
        }

        void PtrsCastable::visit(TupleType *tupleType) {
                result = objectCast( dest, env, indexer );
        }

        void PtrsCastable::visit(VarArgsType *varArgsType) {
                result = objectCast( dest, env, indexer );
        }
} // namespace ResolvExpr

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