source: src/SynTree/DeclReplacer.cc @ 5c473c9

//
// 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.
//
// VarExprReplacer.h --
//
// Author           : Rob Schluntz
// Created On       : Wed Jan 13 16:29:30 2016
// Last Modified By : Rob Schluntz
// Last Modified On : Fri May 13 11:27:52 2016
// Update Count     : 5
//

#include <iostream>       // for operator<<, basic_ostream, ostream, basic_o...

#include "Common/PassVisitor.h"
#include "Declaration.h"  // for operator<<, DeclarationWithType
#include "Expression.h"   // for VariableExpr
#include "DeclReplacer.h"

namespace DeclReplacer {
        namespace {
                /// Visitor that replaces the declarations that VariableExprs refer to, according to the supplied mapping
                struct DeclReplacer {
                private:
                        const DeclMap & declMap;
                        const TypeMap & typeMap;
                        bool debug;
                public:
                        size_t replaced;

                public:
                        DeclReplacer( const DeclMap & declMap, const TypeMap & typeMap, bool debug = false );

                        // replace variable with new node from decl map
                        void previsit( VariableExpr * varExpr );

                        // replace type inst with new node from type map
                        void previsit( TypeInstType * inst );
                };

                /// Mutator that replaces uses of declarations with arbitrary expressions, according to the supplied mapping
                struct ExprDeclReplacer {
                private:
                        const ExprMap & exprMap;
                        bool debug;
                public:
                        size_t replaced;

                public:
                        ExprDeclReplacer( const ExprMap & exprMap, bool debug = false );

                        // replace variable with new node from expr map
                        Expression * postmutate( VariableExpr * varExpr );
                };
        }

        size_t replace( BaseSyntaxNode * node, const DeclMap & declMap, const TypeMap & typeMap, bool debug ) {
                PassVisitor<DeclReplacer> replacer( declMap, typeMap, debug );
                maybeAccept( node, replacer );
                return replacer.pass.replaced;
        }

        size_t replace( BaseSyntaxNode * node, const DeclMap & declMap, bool debug ) {
                TypeMap typeMap;
                return replace( node, declMap, typeMap, debug );
        }

        size_t replace( BaseSyntaxNode * node, const TypeMap & typeMap, bool debug ) {
                DeclMap declMap;
                return replace( node, declMap, typeMap, debug );
        }

        size_t replace( BaseSyntaxNode *& node, const ExprMap & exprMap, bool debug ) {
                PassVisitor<ExprDeclReplacer> replacer( exprMap, debug );
                node = maybeMutate( node, replacer );
                return replacer.pass.replaced;
        }

        namespace {
                DeclReplacer::DeclReplacer( const DeclMap & declMap, const TypeMap & typeMap, bool debug ) : declMap( declMap ), typeMap( typeMap ) , debug( debug ), replaced( 0 ) {}

                // replace variable with new node from decl map
                void DeclReplacer::previsit( VariableExpr * varExpr ) {
                        // xxx - assertions and parameters aren't accounted for in this... (i.e. they aren't inserted into the map when it's made, only DeclStmts are)
                        if ( declMap.count( varExpr->var ) ) {
                                replaced++;
                                auto replacement = declMap.at( varExpr->var );
                                if ( debug ) {
                                        std::cerr << "replacing variable reference: " << (void*)varExpr->var << " " << varExpr->var << " with " << (void*)replacement << " " << replacement << std::endl;
                                }
                                varExpr->var = replacement;
                        }
                }

                void DeclReplacer::previsit( TypeInstType * inst ) {
                        if ( typeMap.count( inst->baseType ) ) {
                                replaced++;
                                auto replacement = typeMap.at( inst->baseType );
                                if ( debug ) {
                                        std::cerr << "replacing type reference: " << (void*)inst->baseType << " " << inst->baseType << " with " << (void*)replacement << " " << replacement << std::endl;
                                }
                                inst->baseType = replacement;
                        }
                }

                ExprDeclReplacer::ExprDeclReplacer( const ExprMap & exprMap, bool debug ) : exprMap( exprMap ), debug( debug ), replaced( 0 ) {}

                Expression * ExprDeclReplacer::postmutate( VariableExpr * varExpr ) {
                        if ( exprMap.count( varExpr->var ) ) {
                                replaced++;
                                Expression * replacement = exprMap.at( varExpr->var )->clone();
                                if ( debug ) {
                                        std::cerr << "replacing variable reference: " << (void*)varExpr->var << " " << varExpr->var << " with " << (void*)replacement << " " << replacement << std::endl;
                                }
                                std::swap( varExpr->env, replacement->env );
                                delete varExpr;
                                return replacement;
                        }
                        return varExpr;
                }
        }
} // namespace VarExprReplacer