source: src/Common/PassVisitor.impl.h@ c935c3a

#pragma once
// IWYU pragma: private, include "PassVisitor.h"

#define VISIT_START( node )                     \
        __attribute__((unused))                   \
        guard_value_impl guard( at_cleanup_impl(pass, 0) );       \
        bool visit_children = true;               \
        set_visit_children( visit_children );   \
        call_previsit( node );                    \
        if( visit_children ) {                    \

#define VISIT_END( node )                       \
        }                                         \
        call_postvisit( node );                   \

#define MUTATE_START( node )                    \
        __attribute__((unused))                   \
        guard_value_impl guard( at_cleanup_impl(pass, 0) );       \
        bool visit_children = true;               \
        set_visit_children( visit_children );   \
        call_premutate( node );                   \
        if( visit_children ) {                    \

#define MUTATE_END( type, node )                \
        }                                         \
        return call_postmutate< type * >( node ); \


#define VISIT_BODY( node )        \
        VISIT_START( node );        \
        Visitor::visit( node );     \
        VISIT_END( node );          \


#define MUTATE_BODY( type, node ) \
        MUTATE_START( node );       \
        Mutator::mutate( node );    \
        MUTATE_END( type, node );   \



template<typename T>
static inline bool empty( T * ptr ) {
        return !ptr || ptr->empty();
}

typedef std::list< Statement   * > StmtList_t;
typedef std::list< Declaration * > DeclList_t;

template<typename iterator_t>
static inline void splice( iterator_t it, DeclList_t * decls ) {
        std::transform(
                decls->begin(),
                decls->end(),
                it,
                [](Declaration * decl) -> auto {
                        return new DeclStmt( noLabels, decl );
                }
        );
        decls->clear();
}

template< typename pass_type >
static inline void acceptAll( std::list< Declaration* > &decls, PassVisitor< pass_type >& visitor ) {

        DeclList_t* beforeDecls = visitor.get_beforeDecls();
        DeclList_t* afterDecls  = visitor.get_afterDecls();

        for ( std::list< Declaration* >::iterator i = decls.begin(); ; ++i ) {
                // splice in new declarations after previous decl
                if ( !empty( afterDecls ) ) { decls.splice( i, *afterDecls ); }

                if ( i == decls.end() ) break;

                // run mutator on declaration
                maybeAccept( *i, visitor );

                // splice in new declarations before current decl
                if ( !empty( beforeDecls ) ) { decls.splice( i, *beforeDecls ); }
        }
}

template< typename pass_type >
static inline void mutateAll( std::list< Declaration* > &decls, PassVisitor< pass_type >& mutator ) {

        DeclList_t* beforeDecls = mutator.get_beforeDecls();
        DeclList_t* afterDecls  = mutator.get_afterDecls();

        for ( std::list< Declaration* >::iterator i = decls.begin(); ; ++i ) {
                // splice in new declarations after previous decl
                if ( !empty( afterDecls ) ) { decls.splice( i, *afterDecls ); }

                if ( i == decls.end() ) break;

                // run mutator on declaration
                *i = maybeMutate( *i, mutator );

                // splice in new declarations before current decl
                if ( !empty( beforeDecls ) ) { decls.splice( i, *beforeDecls ); }
        }
}

template< typename Container, typename VisitorType >
inline void maybeAccept( Container &container, VisitorType &visitor ) {
        SemanticError errors;
        for ( typename Container::iterator i = container.begin(); i != container.end(); ++i ) {
                try {
                        if ( *i ) {
                                (*i)->accept( visitor );
                        }
                } catch( SemanticError &e ) {
                        e.set_location( (*i)->location );
                        errors.append( e );
                }
        }
        if ( ! errors.isEmpty() ) {
                throw errors;
        }
}

template< typename Container, typename MutatorType >
inline void maybeMutateRef( Container &container, MutatorType &mutator ) {
        SemanticError errors;
        for ( typename Container::iterator i = container.begin(); i != container.end(); ++i ) {
                try {
                        if ( *i ) {
///                 *i = (*i)->acceptMutator( mutator );
                                *i = dynamic_cast< typename Container::value_type >( (*i)->acceptMutator( mutator ) );
                                assert( *i );
                        } // if
                } catch( SemanticError &e ) {
                        e.set_location( (*i)->location );
                        errors.append( e );
                } // try
        } // for
        if ( ! errors.isEmpty() ) {
                throw errors;
        } // if
}

template< typename pass_type >
template< typename func_t >
void PassVisitor< pass_type >::handleStatementList( std::list< Statement * > & statements, func_t func ) {
        SemanticError errors;

        // don't want statements from outer CompoundStmts to be added to this CompoundStmt
        ValueGuardPtr< StmtList_t > oldBeforeStmts( get_beforeStmts() );
        ValueGuardPtr< StmtList_t > oldAfterStmts ( get_afterStmts () );
        ValueGuardPtr< DeclList_t > oldBeforeDecls( get_beforeDecls() );
        ValueGuardPtr< DeclList_t > oldAfterDecls ( get_afterDecls () );

        StmtList_t* beforeStmts = get_beforeStmts();
        StmtList_t* afterStmts  = get_afterStmts();
        DeclList_t* beforeDecls = get_beforeDecls();
        DeclList_t* afterDecls  = get_afterDecls();

        for ( std::list< Statement* >::iterator i = statements.begin(); i != statements.end(); ++i ) {

                if ( !empty( afterDecls ) ) { splice( std::inserter( statements, i ), afterDecls ); }
                if ( !empty( afterStmts ) ) { statements.splice( i, *afterStmts ); }

                try {
                        func( *i );
                        assert(( empty( beforeStmts ) && empty( afterStmts ))
                            || ( empty( beforeDecls ) && empty( afterDecls )) );

                } catch ( SemanticError &e ) {
                        errors.append( e );
                }

                if ( !empty( beforeDecls ) ) { splice( std::inserter( statements, i ), beforeDecls ); }
                if ( !empty( beforeStmts ) ) { statements.splice( i, *beforeStmts ); }
        }

        if ( !empty( afterDecls ) ) { splice( std::back_inserter( statements ), afterDecls); }
        if ( !empty( afterStmts ) ) { statements.splice( statements.end(), *afterStmts ); }
        if ( !errors.isEmpty() ) { throw errors; }
}

template< typename pass_type >
void PassVisitor< pass_type >::visitStatementList( std::list< Statement * > & statements ) {
        handleStatementList( statements, [this]( Statement * stmt) {
                stmt->accept( *this );
        });
}

template< typename pass_type >
void PassVisitor< pass_type >::mutateStatementList( std::list< Statement * > & statements ) {
        handleStatementList( statements, [this]( Statement *& stmt) {
                stmt = stmt->acceptMutator( *this );
        });
}


template< typename pass_type >
template< typename func_t >
Statement * PassVisitor< pass_type >::handleStatement( Statement * stmt, func_t func ) {
        // don't want statements from outer CompoundStmts to be added to this CompoundStmt
        ValueGuardPtr< TypeSubstitution * >  oldEnv        ( get_env_ptr    () );
        ValueGuardPtr< DeclList_t >          oldBeforeDecls( get_beforeDecls() );
        ValueGuardPtr< DeclList_t >          oldAfterDecls ( get_afterDecls () );
        ValueGuardPtr< StmtList_t >          oldBeforeStmts( get_beforeStmts() );
        ValueGuardPtr< StmtList_t >          oldAfterStmts ( get_afterStmts () );

        Statement *newStmt = func( stmt );

        StmtList_t* beforeStmts = get_beforeStmts();
        StmtList_t* afterStmts  = get_afterStmts();
        DeclList_t* beforeDecls = get_beforeDecls();
        DeclList_t* afterDecls  = get_afterDecls();

        if( empty(beforeStmts) && empty(afterStmts) && empty(beforeDecls) && empty(afterDecls) ) { return newStmt; }
        assert(( empty( beforeStmts ) && empty( afterStmts ))
            || ( empty( beforeDecls ) && empty( afterDecls )) );

        CompoundStmt *compound = new CompoundStmt( noLabels );
        if( !empty(beforeDecls) ) { splice( std::back_inserter( compound->get_kids() ), beforeDecls ); }
        if( !empty(beforeStmts) ) { compound->get_kids().splice( compound->get_kids().end(), *beforeStmts ); }
        compound->get_kids().push_back( newStmt );
        if( !empty(afterDecls) ) { splice( std::back_inserter( compound->get_kids() ), afterDecls ); }
        if( !empty(afterStmts) ) { compound->get_kids().splice( compound->get_kids().end(), *afterStmts ); }
        return compound;
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::visitStatement( Statement * stmt ) {
        return handleStatement( stmt, [this]( Statement * stmt ) {
                maybeAccept( stmt, *this );
                return stmt;
        });
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutateStatement( Statement * stmt ) {
        return handleStatement( stmt, [this]( Statement * stmt ) {
                return maybeMutate( stmt, *this );
        });
}

template< typename pass_type >
template< typename func_t >
Expression * PassVisitor< pass_type >::handleExpression( Expression * expr, func_t func ) {
        if( !expr ) return nullptr;

        auto env_ptr = get_env_ptr();
        if ( env_ptr && expr->get_env() ) {
                *env_ptr = expr->get_env();
        }

        // should env be cloned (or moved) onto the result of the mutate?
        return func( expr );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::visitExpression( Expression * expr ) {
        return handleExpression(expr, [this]( Expression * expr ) {
                expr->accept( *this );
                return expr;
        });
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutateExpression( Expression * expr ) {
        return handleExpression(expr, [this]( Expression * expr ) {
                return expr->acceptMutator( *this );
        });
}

//------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//========================================================================================================================================================================
//========================================================================================================================================================================
//========================================================================================================================================================================
//========================================================================================================================================================================
//========================================================================================================================================================================
//------------------------------------------------------------------------------------------------------------------------------------------------------------------------


//--------------------------------------------------------------------------
// ObjectDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( ObjectDecl * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->type         , *this );
        maybeAccept        ( node->init         , *this );
        maybeAccept        ( node->bitfieldWidth, *this );

        if ( node->name != "" ) {
                indexerAddId( node );
        }

        VISIT_END( node );
}

template< typename pass_type >
DeclarationWithType * PassVisitor< pass_type >::mutate( ObjectDecl * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->type         , *this );
        maybeMutateRef     ( node->init         , *this );
        maybeMutateRef     ( node->bitfieldWidth, *this );

        if ( node->name != "" ) {
                indexerAddId( node );
        }

        MUTATE_END( DeclarationWithType, node );
}

//--------------------------------------------------------------------------
// FunctionDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( FunctionDecl * node ) {
        VISIT_START( node );

        if ( node->name != "" ) {
                indexerAddId( node );
        }

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->type, *this );
                maybeAccept( node->statements, *this );
        }

        VISIT_END( node );
}

template< typename pass_type >
DeclarationWithType * PassVisitor< pass_type >::mutate( FunctionDecl * node ) {
        MUTATE_START( node );

        if ( node->name != "" ) {
                indexerAddId( node );
        }

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->type, *this );
                maybeMutateRef( node->statements, *this );
        }

        MUTATE_END( DeclarationWithType, node );
}

//--------------------------------------------------------------------------
// StructDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( StructDecl * node ) {
        VISIT_START( node );

        // make up a forward declaration and add it before processing the members
        // needs to be on the heap because addStruct saves the pointer
        indexerAddStructFwd( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->parameters, *this );
                maybeAccept( node->members   , *this );
        }

        // this addition replaces the forward declaration
        indexerAddStruct( node );

        VISIT_END( node );
}

template< typename pass_type >
Declaration * PassVisitor< pass_type >::mutate( StructDecl * node ) {
        MUTATE_START( node );

        // make up a forward declaration and add it before processing the members
        // needs to be on the heap because addStruct saves the pointer
        indexerAddStructFwd( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->parameters, *this );
                maybeMutateRef( node->members   , *this );
        }

        // this addition replaces the forward declaration
        indexerAddStruct( node );

        MUTATE_END( Declaration, node );
}

//--------------------------------------------------------------------------
// UnionDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( UnionDecl * node ) {
        VISIT_START( node );

        // make up a forward declaration and add it before processing the members
        indexerAddUnionFwd( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->parameters, *this );
                maybeAccept( node->members   , *this );
        }

        indexerAddUnion( node );

        VISIT_END( node );
}

template< typename pass_type >
Declaration * PassVisitor< pass_type >::mutate( UnionDecl * node ) {
        MUTATE_START( node );

        // make up a forward declaration and add it before processing the members
        indexerAddUnionFwd( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->parameters, *this );
                maybeMutateRef( node->members   , *this );
        }

        indexerAddUnion( node );

        MUTATE_END( Declaration, node );
}

//--------------------------------------------------------------------------
// EnumDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( EnumDecl * node ) {
        VISIT_START( node );

        indexerAddEnum( node );

        // unlike structs, contexts, and unions, enums inject their members into the global scope
        maybeAccept( node->parameters, *this );
        maybeAccept( node->members   , *this );

        VISIT_END( node );
}

template< typename pass_type >
Declaration * PassVisitor< pass_type >::mutate( EnumDecl * node ) {
        MUTATE_START( node );

        indexerAddEnum( node );

        // unlike structs, contexts, and unions, enums inject their members into the global scope
        maybeMutateRef( node->parameters, *this );
        maybeMutateRef( node->members   , *this );

        MUTATE_END( Declaration, node );
}

//--------------------------------------------------------------------------
// TraitDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( TraitDecl * node ) {
        VISIT_START( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->parameters, *this );
                maybeAccept( node->members   , *this );
        }

        indexerAddTrait( node );

        VISIT_END( node );
}

template< typename pass_type >
Declaration * PassVisitor< pass_type >::mutate( TraitDecl * node ) {
        MUTATE_START( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->parameters, *this );
                maybeMutateRef( node->members   , *this );
        }

        indexerAddTrait( node );

        MUTATE_END( Declaration, node );
}

//--------------------------------------------------------------------------
// TypeDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( TypeDecl * node ) {
        VISIT_START( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->parameters, *this );
                maybeAccept( node->base      , *this );
        }

        indexerAddType( node );

        maybeAccept( node->assertions, *this );

        indexerScopedAccept( node->init, *this );

        VISIT_END( node );
}

template< typename pass_type >
Declaration * PassVisitor< pass_type >::mutate( TypeDecl * node ) {
        MUTATE_START( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->parameters, *this );
                maybeMutateRef( node->base      , *this );
        }

        indexerAddType( node );

        maybeMutateRef( node->assertions, *this );

        indexerScopedMutate( node->init, *this );

        MUTATE_END( Declaration, node );
}

//--------------------------------------------------------------------------
// TypedefDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( TypedefDecl * node ) {
        VISIT_START( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->parameters, *this );
                maybeAccept( node->base      , *this );
        }

        indexerAddType( node );

        maybeAccept( node->assertions, *this );

        VISIT_END( node );
}

template< typename pass_type >
Declaration * PassVisitor< pass_type >::mutate( TypedefDecl * node ) {
        MUTATE_START( node );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef     ( node->parameters, *this );
                maybeMutateRef( node->base      , *this );
        }

        indexerAddType( node );

        maybeMutateRef( node->assertions, *this );

        MUTATE_END( Declaration, node );
}

//--------------------------------------------------------------------------
// AsmDecl
template< typename pass_type >
void PassVisitor< pass_type >::visit( AsmDecl * node ) {
        VISIT_START( node );

        maybeAccept( node->stmt, *this );

        VISIT_END( node );
}

template< typename pass_type >
AsmDecl * PassVisitor< pass_type >::mutate( AsmDecl * node ) {
        MUTATE_START( node );

        maybeMutateRef( node->stmt, *this );

        MUTATE_END( AsmDecl, node );
}

//--------------------------------------------------------------------------
// CompoundStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( CompoundStmt * node ) {
        VISIT_START( node );
        {
                auto guard1 = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                auto guard2 = makeFuncGuard( [this]() { call_beginScope();   }, [this]() { call_endScope();     } );
                visitStatementList( node->kids );
        }
        VISIT_END( node );
}

template< typename pass_type >
CompoundStmt * PassVisitor< pass_type >::mutate( CompoundStmt * node ) {
        MUTATE_START( node );
        {
                auto guard1 = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                auto guard2 = makeFuncGuard( [this]() { call_beginScope();   }, [this]() { call_endScope();     } );
                mutateStatementList( node->kids );
        }
        MUTATE_END( CompoundStmt, node );
}

//--------------------------------------------------------------------------
// ExprStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( ExprStmt * node ) {
        VISIT_START( node );

        visitExpression( node->expr );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( ExprStmt * node ) {
        MUTATE_START( node );

        node->expr = mutateExpression( node->expr );

        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// AsmStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( AsmStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( AsmStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// IfStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( IfStmt * node ) {
        VISIT_START( node );

        visitExpression( node->condition );
        node->thenPart = visitStatement( node->thenPart );
        node->elsePart = visitStatement( node->elsePart );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( IfStmt * node ) {
        MUTATE_START( node );
        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                node->condition = mutateExpression( node->condition );
                node->thenPart  = mutateStatement ( node->thenPart  );
                node->elsePart  = mutateStatement ( node->elsePart  );
        }
        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// WhileStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( WhileStmt * node ) {
        VISIT_START( node );

        visitExpression( node->condition );
        node->body = visitStatement( node->body );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( WhileStmt * node ) {
        MUTATE_START( node );

        node->condition = mutateExpression( node->condition );
        node->body      = mutateStatement ( node->body      );

        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// ForStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( ForStmt * node ) {
        VISIT_START( node );
        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->initialization, *this );
                visitExpression( node->condition );
                visitExpression( node->increment );
                node->body = visitStatement( node->body );
        }
        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( ForStmt * node ) {
        MUTATE_START( node );
        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->initialization, *this );
                node->condition = mutateExpression( node->condition );
                node->increment = mutateExpression( node->increment );
                node->body      = mutateStatement ( node->body      );
        }
        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// SwitchStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( SwitchStmt * node ) {
        VISIT_START( node );

        visitExpression   ( node->condition  );
        visitStatementList( node->statements );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( SwitchStmt * node ) {
        MUTATE_START( node );

        node->condition = mutateExpression( node->condition );
        mutateStatementList( node->statements );

        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// CaseStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( CaseStmt * node ) {
        VISIT_START( node );

        visitExpression   ( node->condition );
        visitStatementList( node->stmts     );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( CaseStmt * node ) {
        MUTATE_START( node );

        node->condition = mutateExpression( node->condition );
        mutateStatementList( node->stmts );

        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// BranchStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( BranchStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( BranchStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// ReturnStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( ReturnStmt * node ) {
        VISIT_START( node );

        visitExpression( node->expr );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( ReturnStmt * node ) {
        MUTATE_START( node );

        node->expr = mutateExpression( node->expr );

        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// ThrowStmt

template< typename pass_type >
void PassVisitor< pass_type >::visit( ThrowStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( ThrowStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// TryStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( TryStmt * node ) {
        VISIT_START( node );

        maybeAccept( node->block       , *this );
        maybeAccept( node->handlers    , *this );
        maybeAccept( node->finallyBlock, *this );

        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( TryStmt * node ) {
        MUTATE_START( node );

        maybeMutateRef( node->block       , *this );
        maybeMutateRef( node->handlers    , *this );
        maybeMutateRef( node->finallyBlock, *this );

        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// CatchStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( CatchStmt * node ) {
        VISIT_START( node );
        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->decl, *this );
                node->cond = visitExpression( node->cond );
                node->body = visitStatement ( node->body );
        }
        VISIT_END( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( CatchStmt * node ) {
        MUTATE_START( node );
        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->decl, *this );
                node->cond = mutateExpression( node->cond );
                node->body = mutateStatement ( node->body );
        }
        MUTATE_END( Statement, node );
}

//--------------------------------------------------------------------------
// FinallyStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( FinallyStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( FinallyStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// WaitForStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( WaitForStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( WaitForStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// NullStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( NullStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
NullStmt * PassVisitor< pass_type >::mutate( NullStmt * node ) {
        MUTATE_BODY( NullStmt, node );
}

//--------------------------------------------------------------------------
// DeclStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( DeclStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( DeclStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// ImplicitCtorDtorStmt
template< typename pass_type >
void PassVisitor< pass_type >::visit( ImplicitCtorDtorStmt * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Statement * PassVisitor< pass_type >::mutate( ImplicitCtorDtorStmt * node ) {
        MUTATE_BODY( Statement, node );
}

//--------------------------------------------------------------------------
// ApplicationExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( ApplicationExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result  , *this );
        maybeAccept        ( node->function, *this );
        maybeAccept        ( node->args    , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( ApplicationExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env     , *this );
        indexerScopedMutate( node->result  , *this );
        maybeMutateRef     ( node->function, *this );
        maybeMutateRef     ( node->args    , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// UntypedExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( UntypedExpr * node ) {
        VISIT_START( node );

        // maybeAccept( node->get_env(), *this );
        indexerScopedAccept( node->result, *this );

        for ( auto expr : node->args ) {
                visitExpression( expr );
        }

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( UntypedExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );

        for ( auto& expr : node->args ) {
                expr = mutateExpression( expr );
        }

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// NameExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( NameExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( NameExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// CastExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( CastExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->arg   , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( CastExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->arg   , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// VirtualCastExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( VirtualCastExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept( node->arg, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( VirtualCastExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->arg   , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// AddressExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( AddressExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->arg   , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( AddressExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->arg   , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// LabelAddressExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( LabelAddressExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( LabelAddressExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// UntypedMemberExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( UntypedMemberExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result   , *this );
        maybeAccept        ( node->aggregate, *this );
        maybeAccept        ( node->member   , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( UntypedMemberExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env      , *this );
        indexerScopedMutate( node->result   , *this );
        maybeMutateRef     ( node->aggregate, *this );
        maybeMutateRef     ( node->member   , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// MemberExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( MemberExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result   , *this );
        maybeAccept        ( node->aggregate, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( MemberExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env      , *this );
        indexerScopedMutate( node->result   , *this );
        maybeMutateRef     ( node->aggregate, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// VariableExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( VariableExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( VariableExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// ConstantExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( ConstantExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result   , *this );
        maybeAccept        ( &node->constant, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( ConstantExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        node->constant = *maybeMutate( &node->constant, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// SizeofExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( SizeofExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        if ( node->get_isType() ) {
                maybeAccept( node->type, *this );
        } else {
                maybeAccept( node->expr, *this );
        }

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( SizeofExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        if ( node->get_isType() ) {
                maybeMutateRef( node->type, *this );
        } else {
                maybeMutateRef( node->expr, *this );
        }

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// AlignofExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( AlignofExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        if ( node->get_isType() ) {
                maybeAccept( node->type, *this );
        } else {
                maybeAccept( node->expr, *this );
        }

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( AlignofExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        if ( node->get_isType() ) {
                maybeMutateRef( node->type, *this );
        } else {
                maybeMutateRef( node->expr, *this );
        }

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// UntypedOffsetofExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( UntypedOffsetofExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->type  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( UntypedOffsetofExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->type  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// OffsetofExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( OffsetofExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->type  , *this );
        maybeAccept        ( node->member, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( OffsetofExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->type  , *this );
        maybeMutateRef     ( node->member, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// OffsetPackExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( OffsetPackExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->type  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( OffsetPackExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->type  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// AttrExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( AttrExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        if ( node->get_isType() ) {
                maybeAccept( node->type, *this );
        } else {
                maybeAccept( node->expr, *this );
        }

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( AttrExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        if ( node->get_isType() ) {
                maybeMutateRef( node->type, *this );
        } else {
                maybeMutateRef( node->expr, *this );
        }

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// LogicalExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( LogicalExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->arg1  , *this );
        maybeAccept        ( node->arg2  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( LogicalExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->arg1  , *this );
        maybeMutateRef     ( node->arg2  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// ConditionalExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( ConditionalExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->arg1  , *this );
        maybeAccept        ( node->arg2  , *this );
        maybeAccept        ( node->arg3  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( ConditionalExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->arg1  , *this );
        maybeMutateRef     ( node->arg2  , *this );
        maybeMutateRef     ( node->arg3  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// CommaExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( CommaExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->arg1  , *this );
        maybeAccept        ( node->arg2  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( CommaExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->arg1  , *this );
        maybeMutateRef     ( node->arg2  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// TypeExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( TypeExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->type, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( TypeExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->type  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// AsmExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( AsmExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result    , *this );
        maybeAccept        ( node->inout     , *this );
        maybeAccept        ( node->constraint, *this );
        maybeAccept        ( node->operand   , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( AsmExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env       , *this );
        indexerScopedMutate( node->result    , *this );
        maybeMutateRef     ( node->inout     , *this );
        maybeMutateRef     ( node->constraint, *this );
        maybeMutateRef     ( node->operand   , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// ImplicitCopyCtorExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( ImplicitCopyCtorExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result     , *this );
        maybeAccept        ( node->callExpr   , *this );
        maybeAccept        ( node->tempDecls  , *this );
        maybeAccept        ( node->returnDecls, *this );
        maybeAccept        ( node->dtors      , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( ImplicitCopyCtorExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env        , *this );
        indexerScopedMutate( node->result     , *this );
        maybeMutateRef     ( node->callExpr   , *this );
        maybeMutateRef     ( node->tempDecls  , *this );
        maybeMutateRef     ( node->returnDecls, *this );
        maybeMutateRef     ( node->dtors      , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// ConstructorExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( ConstructorExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result  , *this );
        maybeAccept        ( node->callExpr, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( ConstructorExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env     , *this );
        indexerScopedMutate( node->result  , *this );
        maybeMutateRef     ( node->callExpr, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// CompoundLiteralExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( CompoundLiteralExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result     , *this );
        maybeAccept        ( node->initializer, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( CompoundLiteralExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env        , *this );
        indexerScopedMutate( node->result     , *this );
        maybeMutateRef     ( node->initializer, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// RangeExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( RangeExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->low   , *this );
        maybeAccept        ( node->high  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( RangeExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->low   , *this );
        maybeMutateRef     ( node->high  , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// UntypedTupleExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( UntypedTupleExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->exprs , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( UntypedTupleExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->exprs , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// TupleExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( TupleExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept          ( node->exprs , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( TupleExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->exprs , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// TupleIndexExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( TupleIndexExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->tuple , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( TupleIndexExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->tuple , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// TupleAssignExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( TupleAssignExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result  , *this );
        maybeAccept        ( node->stmtExpr, *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( TupleAssignExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env     , *this );
        indexerScopedMutate( node->result  , *this );
        maybeMutateRef     ( node->stmtExpr, *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// StmtExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( StmtExpr * node ) {
        VISIT_START( node );

        // don't want statements from outer CompoundStmts to be added to this StmtExpr
        ValueGuardPtr< TypeSubstitution * >      oldEnv        ( get_env_ptr() );
        ValueGuardPtr< std::list< Statement* > > oldBeforeStmts( get_beforeStmts() );
        ValueGuardPtr< std::list< Statement* > > oldAfterStmts ( get_afterStmts () );

        indexerScopedAccept( node->result     , *this );
        maybeAccept        ( node->statements , *this );
        maybeAccept        ( node->returnDecls, *this );
        maybeAccept        ( node->dtors      , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( StmtExpr * node ) {
        MUTATE_START( node );

        // don't want statements from outer CompoundStmts to be added to this StmtExpr
        ValueGuardPtr< TypeSubstitution * >      oldEnv        ( get_env_ptr() );
        ValueGuardPtr< std::list< Statement* > > oldBeforeStmts( get_beforeStmts() );
        ValueGuardPtr< std::list< Statement* > > oldAfterStmts ( get_afterStmts () );

        indexerScopedMutate( node->result     , *this );
        maybeMutateRef     ( node->statements , *this );
        maybeMutateRef     ( node->returnDecls, *this );
        maybeMutateRef     ( node->dtors      , *this );

        MUTATE_END( Expression, node );
}

//--------------------------------------------------------------------------
// UniqueExpr
template< typename pass_type >
void PassVisitor< pass_type >::visit( UniqueExpr * node ) {
        VISIT_START( node );

        indexerScopedAccept( node->result, *this );
        maybeAccept        ( node->expr  , *this );

        VISIT_END( node );
}

template< typename pass_type >
Expression * PassVisitor< pass_type >::mutate( UniqueExpr * node ) {
        MUTATE_START( node );

        indexerScopedMutate( node->env   , *this );
        indexerScopedMutate( node->result, *this );
        maybeMutateRef     ( node->expr  , *this );

        MUTATE_END( Expression, node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( VoidType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( BasicType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( PointerType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( ArrayType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( ReferenceType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( FunctionType * node ) {
        VISIT_BODY( node );
}

//--------------------------------------------------------------------------
// StructInstType
template< typename pass_type >
void PassVisitor< pass_type >::visit( StructInstType * node ) {
        VISIT_START( node );

        indexerAddStruct( node->name );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->forall    , *this );
                maybeAccept( node->parameters, *this );
        }

        VISIT_END( node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( StructInstType * node ) {
        MUTATE_START( node );

        indexerAddStruct( node->name );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->forall    , *this );
                maybeMutateRef( node->parameters, *this );
        }

        MUTATE_END( Type, node );
}

//--------------------------------------------------------------------------
// UnionInstType
template< typename pass_type >
void PassVisitor< pass_type >::visit( UnionInstType * node ) {
        VISIT_START( node );

        indexerAddStruct( node->name );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeAccept( node->forall    , *this );
                maybeAccept( node->parameters, *this );
        }

        VISIT_END( node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( UnionInstType * node ) {
        MUTATE_START( node );

        indexerAddStruct( node->name );

        {
                auto guard = makeFuncGuard( [this]() { indexerScopeEnter(); }, [this]() { indexerScopeLeave(); } );
                maybeMutateRef( node->forall    , *this );
                maybeMutateRef( node->parameters, *this );
        }

        MUTATE_END( Type, node );
}

//--------------------------------------------------------------------------
// EnumInstType
template< typename pass_type >
void PassVisitor< pass_type >::visit( EnumInstType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( EnumInstType * node ) {
        MUTATE_BODY( Type, node );
}

//--------------------------------------------------------------------------
// TraitInstType
template< typename pass_type >
void PassVisitor< pass_type >::visit( TraitInstType * node ) {
        VISIT_START( node );

        maybeAccept( node->forall    , *this );
        maybeAccept( node->parameters, *this );

        VISIT_END( node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( TraitInstType * node ) {
        MUTATE_START( node );

        maybeMutateRef( node->forall    , *this );
        maybeMutateRef( node->parameters, *this );

        MUTATE_END( Type, node );
}

//--------------------------------------------------------------------------
// TypeInstType
template< typename pass_type >
void PassVisitor< pass_type >::visit( TypeInstType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( TupleType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( TypeofType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( AttrType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( VarArgsType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( ZeroType * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( OneType * node ) {
        VISIT_BODY( node );
}

//--------------------------------------------------------------------------
// SingleInit
template< typename pass_type >
void PassVisitor< pass_type >::visit( SingleInit * node ) {
        VISIT_START( node );

        visitExpression( node->get_value() );

        VISIT_END( node );
}

template< typename pass_type >
Initializer * PassVisitor< pass_type >::mutate( SingleInit * node ) {
        MUTATE_START( node );

        node->set_value( mutateExpression( node->get_value() ) );

        MUTATE_END( Initializer, node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( ListInit * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( ConstructorInit * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( Subrange * node ) {
        VISIT_BODY( node );
}

template< typename pass_type >
void PassVisitor< pass_type >::visit( Constant * node ) {
        VISIT_BODY( node );
}

//---------------------------------------------------------------------------------------------------------------
template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( VoidType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( BasicType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( PointerType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( ArrayType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( ReferenceType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( FunctionType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( TypeInstType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( TupleType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( TypeofType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( AttrType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( VarArgsType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( ZeroType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Type * PassVisitor< pass_type >::mutate( OneType * node ) {
        MUTATE_BODY( Type, node );
}

template< typename pass_type >
Initializer * PassVisitor< pass_type >::mutate( ListInit * node ) {
        MUTATE_BODY( Initializer, node );
}

template< typename pass_type >
Initializer * PassVisitor< pass_type >::mutate( ConstructorInit * node ) {
        MUTATE_BODY( Initializer, node );
}

template< typename pass_type >
Subrange * PassVisitor< pass_type >::mutate( Subrange * node  )  {
        MUTATE_BODY( Subrange, node );
}

template< typename pass_type >
Constant * PassVisitor< pass_type >::mutate( Constant * node  )  {
        MUTATE_BODY( Constant, node );
}