source: src/AST/GenericSubstitution.cpp @ 0e42794

//
// 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.
//
// GenericSubstitution.cpp --
//
// Author           : Aaron B. Moss
// Created On       : Wed May 22 14:15:00 2019
// Last Modified By : Aaron B. Moss
// Created On       : Wed May 22 14:15:00 2019
// Update Count     : 1
//

#include "GenericSubstitution.hpp"

#include <cassert>
#include <utility>               // for move

#include "Decl.hpp"
#include "Node.hpp"              // for maybe_accept
#include "Pass.hpp"
#include "Type.hpp"
#include "TypeSubstitution.hpp"

namespace ast {

namespace {
        struct GenericSubstitutionBuilder : public WithShortCircuiting {
                TypeSubstitution sub;

                void previsit( const Type * ty ) {
                        assertf( false, "Attempted generic substitution for non-aggregate type: %s",
                                toString( ty ).c_str() );
                }

                void previsit( const ReferenceType * ) {
                        // do nothing; allows substitution from base type
                }

                void previsit( const ReferenceToType * ty ) {
                        visit_children = false;
                        // build substitution from base parameters
                        const AggregateDecl * aggr = ty->aggr();
                        sub = TypeSubstitution{ aggr->params.begin(), aggr->params.end(), ty->params.begin() };
                }
        };
}

TypeSubstitution genericSubsitution( const Type * ty ) {
        Pass<GenericSubstitutionBuilder> builder;
        maybe_accept( ty, builder );
        return std::move(builder.pass.sub);
}

}

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