source: src/ResolvExpr/AdjustExprType.cc @ 18f7858

//
// 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.
//
// AdjustExprType_old.cc --
//
// Author           : Richard C. Bilson
// Created On       : Sat May 16 23:41:42 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Wed Dec 11 21:43:56 2019
// Update Count     : 6
//

#include "AST/Node.hpp"
#include "AST/Pass.hpp"
#include "AST/SymbolTable.hpp"
#include "AST/Type.hpp"
#include "AST/TypeEnvironment.hpp"
#include "Common/PassVisitor.h"
#include "SymTab/Indexer.h"       // for Indexer
#include "SynTree/Declaration.h"  // for TypeDecl, TypeDecl::Kind::Ftype
#include "SynTree/Mutator.h"      // for Mutator
#include "SynTree/Type.h"         // for PointerType, TypeInstType, Type
#include "TypeEnvironment.h"      // for EqvClass, TypeEnvironment

namespace ResolvExpr {

namespace {
        class AdjustExprType_old final : public WithShortCircuiting {
                public:
                AdjustExprType_old( const TypeEnvironment & env, const SymTab::Indexer & indexer );
                void premutate( VoidType * ) { visit_children = false; }
                void premutate( BasicType * ) { visit_children = false; }
                void premutate( PointerType * ) { visit_children = false; }
                void premutate( ArrayType * ) { visit_children = false; }
                void premutate( FunctionType * ) { visit_children = false; }
                void premutate( StructInstType * ) { visit_children = false; }
                void premutate( UnionInstType * ) { visit_children = false; }
                void premutate( EnumInstType * ) { visit_children = false; }
                void premutate( TraitInstType * ) { visit_children = false; }
                void premutate( TypeInstType * ) { visit_children = false; }
                void premutate( TupleType * ) { visit_children = false; }
                void premutate( VarArgsType * ) { visit_children = false; }
                void premutate( ZeroType * ) { visit_children = false; }
                void premutate( OneType * ) { visit_children = false; }

                Type * postmutate( ArrayType * arrayType );
                Type * postmutate( FunctionType * functionType );
                Type * postmutate( TypeInstType * aggregateUseType );

                private:
                const TypeEnvironment & env;
                const SymTab::Indexer & indexer;
        };

        AdjustExprType_old::AdjustExprType_old( const TypeEnvironment &env, const SymTab::Indexer &indexer )
                : env( env ), indexer( indexer ) {
        }

        Type * AdjustExprType_old::postmutate( ArrayType * arrayType ) {
                PointerType * pointerType = new PointerType{ arrayType->get_qualifiers(), arrayType->base };
                arrayType->base = nullptr;
                delete arrayType;
                return pointerType;
        }

        Type * AdjustExprType_old::postmutate( FunctionType * functionType ) {
                return new PointerType{ Type::Qualifiers(), functionType };
        }

        Type * AdjustExprType_old::postmutate( TypeInstType * typeInst ) {
                if ( const EqvClass * eqvClass = env.lookup( typeInst->get_name() ) ) {
                        if ( eqvClass->data.kind == TypeDecl::Ftype ) {
                                return new PointerType{ Type::Qualifiers(), typeInst };
                        }
                } else if ( const NamedTypeDecl * ntDecl = indexer.lookupType( typeInst->get_name() ) ) {
                        if ( const TypeDecl * tyDecl = dynamic_cast< const TypeDecl * >( ntDecl ) ) {
                                if ( tyDecl->get_kind() == TypeDecl::Ftype ) {
                                        return new PointerType{ Type::Qualifiers(), typeInst };
                                } // if
                        } // if
                } // if
                return typeInst;
        }
} // anonymous namespace

void adjustExprType( Type *&type, const TypeEnvironment &env, const SymTab::Indexer &indexer ) {
        PassVisitor<AdjustExprType_old> adjuster( env, indexer );
        Type * newType = type->acceptMutator( adjuster );
        type = newType;
}

void adjustExprType( Type *& type ) {
        TypeEnvironment env;
        SymTab::Indexer indexer;
        adjustExprType( type, env, indexer );
}

namespace {
        class AdjustExprType_new final : public ast::WithShortCircuiting {
                const ast::SymbolTable & symtab;
        public:
                const ast::TypeEnvironment & tenv;

                AdjustExprType_new( const ast::TypeEnvironment & e, const ast::SymbolTable & syms )
                : symtab( syms ), tenv( e ) {}

                void previsit( const ast::VoidType * ) { visit_children = false; }
                void previsit( const ast::BasicType * ) { visit_children = false; }
                void previsit( const ast::PointerType * ) { visit_children = false; }
                void previsit( const ast::ArrayType * ) { visit_children = false; }
                void previsit( const ast::FunctionType * ) { visit_children = false; }
                void previsit( const ast::StructInstType * ) { visit_children = false; }
                void previsit( const ast::UnionInstType * ) { visit_children = false; }
                void previsit( const ast::EnumInstType * ) { visit_children = false; }
                void previsit( const ast::TraitInstType * ) { visit_children = false; }
                void previsit( const ast::TypeInstType * ) { visit_children = false; }
                void previsit( const ast::TupleType * ) { visit_children = false; }
                void previsit( const ast::VarArgsType * ) { visit_children = false; }
                void previsit( const ast::ZeroType * ) { visit_children = false; }
                void previsit( const ast::OneType * ) { visit_children = false; }

                const ast::Type * postvisit( const ast::ArrayType * at ) {
                        return new ast::PointerType{ at->base, at->qualifiers };
                }

                const ast::Type * postvisit( const ast::FunctionType * ft ) {
                        return new ast::PointerType{ ft };
                }

                const ast::Type * postvisit( const ast::TypeInstType * inst ) {
                        // replace known function-type-variables with pointer-to-function
                        if ( const ast::EqvClass * eqvClass = tenv.lookup( *inst ) ) {
                                if ( eqvClass->data.kind == ast::TypeDecl::Ftype ) {
                                        return new ast::PointerType{ inst };
                                }
                        } else if ( const ast::NamedTypeDecl * ntDecl = symtab.lookupType( inst->name ) ) {
                                if ( auto tyDecl = dynamic_cast< const ast::TypeDecl * >( ntDecl ) ) {
                                        if ( tyDecl->kind == ast::TypeDecl::Ftype ) {
                                                return new ast::PointerType{ inst };
                                        }
                                }
                        }
                        return inst;
                }
        };
} // anonymous namespace

const ast::Type * adjustExprType(
        const ast::Type * type, const ast::TypeEnvironment & env, const ast::SymbolTable & symtab
) {
        ast::Pass<AdjustExprType_new> adjuster{ env, symtab };
        return type->accept( adjuster );
}

} // namespace ResolvExpr

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