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source: src/AST/Pass.impl.hpp @ f474e91

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Last change on this file since f474e91 was d908563, checked in by Thierry Delisle <tdelisle@…>, 5 years ago
Merge branch 'master' into cleanup-dtors
Property mode set to `100644`
File size: 55.1 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2019 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// ast::Pass.impl.hpp --
8	//
9	// Author : Thierry Delisle
10	// Created On : Thu May 09 15::37::05 2019
11	// Last Modified By :
12	// Last Modified On :
13	// Update Count :
14	//
15
16	#pragma once
17	// IWYU pragma: private, include "AST/Pass.hpp"
18
19	#include <type_traits>
20	#include <unordered_map>
21
22	#include "AST/TypeSubstitution.hpp"
23
24	#define VISIT_START( node ) \
25	using namespace ast; \
26	/* back-up the visit children */ \
27	__attribute__((unused)) ast::__pass::visit_children_guard guard1( ast::__pass::visit_children(pass, 0) ); \
28	/* setup the scope for passes that want to run code at exit */ \
29	__attribute__((unused)) ast::__pass::guard_value guard2( ast::__pass::at_cleanup (pass, 0) ); \
30	/* call the implementation of the previsit of this pass */ \
31	__pass::previsit( pass, node, 0 );
32
33	#define VISIT( code... ) \
34	/* if this node should visit its children */ \
35	if ( __visit_children() ) { \
36	/* visit the children */ \
37	code \
38	}
39
40	#define VISIT_END( type, node ) \
41	/* call the implementation of the postvisit of this pass */ \
42	auto __return = __pass::postvisit( pass, node, 0 ); \
43	assertf(__return, "post visit should never return null"); \
44	return __return;
45
46	#ifdef PEDANTIC_PASS_ASSERT
47	#define __pedantic_pass_assert(...) assert (__VA_ARGS__)
48	#define __pedantic_pass_assertf(...) assertf(__VA_ARGS__)
49	#else
50	#define __pedantic_pass_assert(...)
51	#define __pedantic_pass_assertf(...)
52	#endif
53
54	namespace ast {
55	namespace __pass {
56	// Check if this is either a null pointer or a pointer to an empty container
57	template<typename T>
58	static inline bool empty( T * ptr ) {
59	return !ptr \|\| ptr->empty();
60	}
61
62	//------------------------------
63	template<typename it_t, template <class...> class container_t>
64	static inline void take_all( it_t it, container_t<ast::ptr<ast::Decl>> * decls, bool * mutated = nullptr ) {
65	if(empty(decls)) return;
66
67	std::transform(decls->begin(), decls->end(), it, [](const ast::Decl * decl) -> auto {
68	return new DeclStmt( decl->location, decl );
69	});
70	decls->clear();
71	if(mutated) *mutated = true;
72	}
73
74	template<typename it_t, template <class...> class container_t>
75	static inline void take_all( it_t it, container_t<ast::ptr<ast::Stmt>> * decls, bool * mutated = nullptr ) {
76	if(empty(decls)) return;
77
78	std::move(decls->begin(), decls->end(), it);
79	decls->clear();
80	if(mutated) *mutated = true;
81	}
82
83	//------------------------------
84	/// Check if should be skipped, different for pointers and containers
85	template<typename node_t>
86	bool skip( const ast::ptr<node_t> & val) {
87	return !val;
88	}
89
90	template< template <class...> class container_t, typename node_t >
91	bool skip( const container_t<ast::ptr< node_t >> & val ) {
92	return val.empty();
93	}
94
95	//------------------------------
96	/// Get the value to visit, different for pointers and containers
97	template<typename node_t>
98	auto get( const ast::ptr<node_t> & val, int ) -> decltype(val.get()) {
99	return val.get();
100	}
101
102	template<typename node_t>
103	const node_t & get( const node_t & val, long) {
104	return val;
105	}
106
107
108	//------------------------------
109	/// Check if value was mutated, different for pointers and containers
110	template<typename lhs_t, typename rhs_t>
111	bool differs( const lhs_t * old_val, const rhs_t * new_val ) {
112	return old_val != new_val;
113	}
114
115	template< template <class...> class container_t, typename node_t >
116	bool differs( const container_t<ast::ptr< node_t >> &, const container_t<ast::ptr< node_t >> & new_val ) {
117	return !new_val.empty();
118	}
119	}
120
121	template< typename pass_t >
122	template< typename node_t >
123	auto ast::Pass< pass_t >::call_accept( const node_t * node )
124	-> typename std::enable_if<
125	!std::is_base_of<ast::Expr, node_t>::value &&
126	!std::is_base_of<ast::Stmt, node_t>::value
127	, decltype( node->accept(*this) )
128	>::type
129
130	{
131	__pedantic_pass_assert( __visit_children() );
132	__pedantic_pass_assert( expr );
133
134	static_assert( !std::is_base_of<ast::Expr, node_t>::value, "ERROR");
135	static_assert( !std::is_base_of<ast::Stmt, node_t>::value, "ERROR");
136
137	return node->accept( *this );
138	}
139
140	template< typename pass_t >
141	const ast::Expr * ast::Pass< pass_t >::call_accept( const ast::Expr * expr ) {
142	__pedantic_pass_assert( __visit_children() );
143	__pedantic_pass_assert( expr );
144
145	const ast::TypeSubstitution ** env_ptr = __pass::env( pass, 0);
146	if ( env_ptr && expr->env ) {
147	*env_ptr = expr->env;
148	}
149
150	return expr->accept( *this );
151	}
152
153	template< typename pass_t >
154	const ast::Stmt * ast::Pass< pass_t >::call_accept( const ast::Stmt * stmt ) {
155	__pedantic_pass_assert( __visit_children() );
156	__pedantic_pass_assert( stmt );
157
158	// add a few useful symbols to the scope
159	using __pass::empty;
160
161	// get the stmts/decls that will need to be spliced in
162	auto stmts_before = __pass::stmtsToAddBefore( pass, 0);
163	auto stmts_after = __pass::stmtsToAddAfter ( pass, 0);
164	auto decls_before = __pass::declsToAddBefore( pass, 0);
165	auto decls_after = __pass::declsToAddAfter ( pass, 0);
166
167	// These may be modified by subnode but most be restored once we exit this statemnet.
168	ValueGuardPtr< const ast::TypeSubstitution * > __old_env ( __pass::env( pass, 0) );
169	ValueGuardPtr< typename std::remove_pointer< decltype(stmts_before) >::type > __old_decls_before( stmts_before );
170	ValueGuardPtr< typename std::remove_pointer< decltype(stmts_after ) >::type > __old_decls_after ( stmts_after );
171	ValueGuardPtr< typename std::remove_pointer< decltype(decls_before) >::type > __old_stmts_before( decls_before );
172	ValueGuardPtr< typename std::remove_pointer< decltype(decls_after ) >::type > __old_stmts_after ( decls_after );
173
174	// Now is the time to actually visit the node
175	const ast::Stmt * nstmt = stmt->accept( *this );
176
177	// If the pass doesn't want to add anything then we are done
178	if( empty(stmts_before) && empty(stmts_after) && empty(decls_before) && empty(decls_after) ) {
179	return nstmt;
180	}
181
182	// Make sure that it is either adding statements or declartions but not both
183	// this is because otherwise the order would be awkward to predict
184	assert(( empty( stmts_before ) && empty( stmts_after ))
185	\|\| ( empty( decls_before ) && empty( decls_after )) );
186
187	// Create a new Compound Statement to hold the new decls/stmts
188	ast::CompoundStmt * compound = new ast::CompoundStmt( stmt->location );
189
190	// Take all the declarations that go before
191	__pass::take_all( std::back_inserter( compound->kids ), decls_before );
192	__pass::take_all( std::back_inserter( compound->kids ), stmts_before );
193
194	// Insert the original declaration
195	compound->kids.emplace_back( nstmt );
196
197	// Insert all the declarations that go before
198	__pass::take_all( std::back_inserter( compound->kids ), decls_after );
199	__pass::take_all( std::back_inserter( compound->kids ), stmts_after );
200
201	return compound;
202	}
203
204	template< typename pass_t >
205	template< template <class...> class container_t >
206	container_t< ptr<Stmt> > ast::Pass< pass_t >::call_accept( const container_t< ptr<Stmt> > & statements ) {
207	__pedantic_pass_assert( __visit_children() );
208	if( statements.empty() ) return {};
209
210	// We are going to aggregate errors for all these statements
211	SemanticErrorException errors;
212
213	// add a few useful symbols to the scope
214	using __pass::empty;
215
216	// get the stmts/decls that will need to be spliced in
217	auto stmts_before = __pass::stmtsToAddBefore( pass, 0);
218	auto stmts_after = __pass::stmtsToAddAfter ( pass, 0);
219	auto decls_before = __pass::declsToAddBefore( pass, 0);
220	auto decls_after = __pass::declsToAddAfter ( pass, 0);
221
222	// These may be modified by subnode but most be restored once we exit this statemnet.
223	ValueGuardPtr< typename std::remove_pointer< decltype(stmts_before) >::type > __old_decls_before( stmts_before );
224	ValueGuardPtr< typename std::remove_pointer< decltype(stmts_after ) >::type > __old_decls_after ( stmts_after );
225	ValueGuardPtr< typename std::remove_pointer< decltype(decls_before) >::type > __old_stmts_before( decls_before );
226	ValueGuardPtr< typename std::remove_pointer< decltype(decls_after ) >::type > __old_stmts_after ( decls_after );
227
228	// update pass statitistics
229	pass_visitor_stats.depth++;
230	pass_visitor_stats.max->push(pass_visitor_stats.depth);
231	pass_visitor_stats.avg->push(pass_visitor_stats.depth);
232
233	bool mutated = false;
234	container_t< ptr<Stmt> > new_kids;
235	for( const Stmt * stmt : statements ) {
236	try {
237	__pedantic_pass_assert( stmt );
238	const ast::Stmt * new_stmt = stmt->accept( *this );
239	assert( new_stmt );
240	if(new_stmt != stmt ) mutated = true;
241
242	// Make sure that it is either adding statements or declartions but not both
243	// this is because otherwise the order would be awkward to predict
244	assert(( empty( stmts_before ) && empty( stmts_after ))
245	\|\| ( empty( decls_before ) && empty( decls_after )) );
246
247
248
249	// Take all the statements which should have gone after, N/A for first iteration
250	__pass::take_all( std::back_inserter( new_kids ), decls_before, &mutated );
251	__pass::take_all( std::back_inserter( new_kids ), stmts_before, &mutated );
252
253	// Now add the statement if there is one
254	new_kids.emplace_back( new_stmt );
255
256	// Take all the declarations that go before
257	__pass::take_all( std::back_inserter( new_kids ), decls_after, &mutated );
258	__pass::take_all( std::back_inserter( new_kids ), stmts_after, &mutated );
259	}
260	catch ( SemanticErrorException &e ) {
261	errors.append( e );
262	}
263	}
264	pass_visitor_stats.depth--;
265	if ( !errors.isEmpty() ) { throw errors; }
266
267	return mutated ? new_kids : container_t< ptr<Stmt> >();
268	}
269
270	template< typename pass_t >
271	template< template <class...> class container_t, typename node_t >
272	container_t< ast::ptr<node_t> > ast::Pass< pass_t >::call_accept( const container_t< ast::ptr<node_t> > & container ) {
273	__pedantic_pass_assert( __visit_children() );
274	if( container.empty() ) return {};
275	SemanticErrorException errors;
276
277	pass_visitor_stats.depth++;
278	pass_visitor_stats.max->push(pass_visitor_stats.depth);
279	pass_visitor_stats.avg->push(pass_visitor_stats.depth);
280
281	bool mutated = false;
282	container_t< ast::ptr<node_t> > new_kids;
283	for ( const node_t * node : container ) {
284	try {
285	__pedantic_pass_assert( node );
286	const node_t * new_stmt = strict_dynamic_cast< const node_t * >( node->accept( *this ) );
287	if(new_stmt != node ) mutated = true;
288
289	new_kids.emplace_back( new_stmt );
290	}
291	catch( SemanticErrorException &e ) {
292	errors.append( e );
293	}
294	}
295	pass_visitor_stats.depth--;
296	if ( ! errors.isEmpty() ) { throw errors; }
297
298	return mutated ? new_kids : container_t< ast::ptr<node_t> >();
299	}
300
301	template< typename pass_t >
302	template<typename node_t, typename parent_t, typename child_t>
303	void ast::Pass< pass_t >::maybe_accept(
304	const node_t * & parent,
305	child_t parent_t::*child
306	) {
307	static_assert( std::is_base_of<parent_t, node_t>::value, "Error deducing member object" );
308
309	if(__pass::skip(parent->*child)) return;
310	const auto & old_val = __pass::get(parent->*child, 0);
311
312	static_assert( !std::is_same<const ast::Node * &, decltype(old_val)>::value, "ERROR");
313
314	auto new_val = call_accept( old_val );
315
316	static_assert( !std::is_same<const ast::Node *, decltype(new_val)>::value \|\| std::is_same<int, decltype(old_val)>::value, "ERROR");
317
318	if( __pass::differs(old_val, new_val) ) {
319	auto new_parent = mutate(parent);
320	new_parent->*child = new_val;
321	parent = new_parent;
322	}
323	}
324
325	}
326
327	//------------------------------------------------------------------------------------------------------------------------------------------------------------------------
328	//========================================================================================================================================================================
329	//========================================================================================================================================================================
330	//========================================================================================================================================================================
331	//========================================================================================================================================================================
332	//========================================================================================================================================================================
333	//------------------------------------------------------------------------------------------------------------------------------------------------------------------------
334
335	template< typename pass_t >
336	inline void ast::accept_all( std::list< ast::ptr<ast::Decl> > & decls, ast::Pass< pass_t > & visitor ) {
337	// We are going to aggregate errors for all these statements
338	SemanticErrorException errors;
339
340	// add a few useful symbols to the scope
341	using __pass::empty;
342
343	// get the stmts/decls that will need to be spliced in
344	auto decls_before = __pass::declsToAddBefore( visitor.pass, 0);
345	auto decls_after = __pass::declsToAddAfter ( visitor.pass, 0);
346
347	// update pass statitistics
348	pass_visitor_stats.depth++;
349	pass_visitor_stats.max->push(pass_visitor_stats.depth);
350	pass_visitor_stats.avg->push(pass_visitor_stats.depth);
351
352	for ( std::list< ast::ptr<ast::Decl> >::iterator i = decls.begin(); ; ++i ) {
353	// splice in new declarations after previous decl
354	if ( !empty( decls_after ) ) { decls.splice( i, *decls_after ); }
355
356	if ( i == decls.end() ) break;
357
358	try {
359	// run visitor on declaration
360	ast::ptr<ast::Decl> & node = *i;
361	assert( node );
362	node = node->accept( visitor );
363	}
364	catch( SemanticErrorException &e ) {
365	errors.append( e );
366	}
367
368	// splice in new declarations before current decl
369	if ( !empty( decls_before ) ) { decls.splice( i, *decls_before ); }
370	}
371	pass_visitor_stats.depth--;
372	if ( !errors.isEmpty() ) { throw errors; }
373	}
374
375	// A NOTE ON THE ORDER OF TRAVERSAL
376	//
377	// Types and typedefs have their base types visited before they are added to the type table. This is ok, since there is
378	// no such thing as a recursive type or typedef.
379	//
380	// typedef struct { T *x; } T; // never allowed
381	//
382	// for structs/unions, it is possible to have recursion, so the decl should be added as if it's incomplete to begin, the
383	// members are traversed, and then the complete type should be added (assuming the type is completed by this particular
384	// declaration).
385	//
386	// struct T { struct T *x; }; // allowed
387	//
388	// It is important to add the complete type to the symbol table after the members/base has been traversed, since that
389	// traversal may modify the definition of the type and these modifications should be visible when the symbol table is
390	// queried later in this pass.
391
392	//--------------------------------------------------------------------------
393	// ObjectDecl
394	template< typename pass_t >
395	const ast::DeclWithType * ast::Pass< pass_t >::visit( const ast::ObjectDecl * node ) {
396	VISIT_START( node );
397
398	VISIT(
399	{
400	guard_indexer guard { *this };
401	maybe_accept( node, &ObjectDecl::type );
402	}
403	maybe_accept( node, &ObjectDecl::init );
404	maybe_accept( node, &ObjectDecl::bitfieldWidth );
405	maybe_accept( node, &ObjectDecl::attributes );
406	)
407
408	__pass::indexer::addId( pass, 0, node );
409
410	VISIT_END( DeclWithType, node );
411	}
412
413	//--------------------------------------------------------------------------
414	// FunctionDecl
415	template< typename pass_t >
416	const ast::DeclWithType * ast::Pass< pass_t >::visit( const ast::FunctionDecl * node ) {
417	VISIT_START( node );
418
419	__pass::indexer::addId( pass, 0, node );
420
421	VISIT(maybe_accept( node, &FunctionDecl::withExprs );)
422	{
423	// with clause introduces a level of scope (for the with expression members).
424	// with clause exprs are added to the indexer before parameters so that parameters
425	// shadow with exprs and not the other way around.
426	guard_indexer guard { *this };
427	__pass::indexer::addWith( pass, 0, node->withExprs, node );
428	{
429	guard_indexer guard { *this };
430	// implicit add __func__ identifier as specified in the C manual 6.4.2.2
431	static ast::ObjectDecl func(
432	node->location, "__func__",
433	new ast::ArrayType(
434	new ast::BasicType( ast::BasicType::Char, ast::CV::Qualifiers( ast::CV::Const ) ),
435	nullptr, VariableLen, DynamicDim
436	)
437	);
438	__pass::indexer::addId( pass, 0, &func );
439	VISIT(
440	maybe_accept( node, &FunctionDecl::type );
441	// function body needs to have the same scope as parameters - CompoundStmt will not enter
442	// a new scope if inFunction is true
443	ValueGuard< bool > oldInFunction( inFunction );
444	inFunction = true;
445	maybe_accept( node, &FunctionDecl::stmts );
446	maybe_accept( node, &FunctionDecl::attributes );
447	)
448	}
449	}
450
451	VISIT_END( DeclWithType, node );
452	}
453
454	//--------------------------------------------------------------------------
455	// StructDecl
456	template< typename pass_t >
457	const ast::Decl * ast::Pass< pass_t >::visit( const ast::StructDecl * node ) {
458	VISIT_START( node );
459
460	// make up a forward declaration and add it before processing the members
461	// needs to be on the heap because addStruct saves the pointer
462	__pass::indexer::addStructFwd( pass, 0, node );
463
464	VISIT({
465	guard_indexer guard { * this };
466	maybe_accept( node, &StructDecl::params );
467	maybe_accept( node, &StructDecl::members );
468	})
469
470	// this addition replaces the forward declaration
471	__pass::indexer::addStruct( pass, 0, node );
472
473	VISIT_END( Decl, node );
474	}
475
476	//--------------------------------------------------------------------------
477	// UnionDecl
478	template< typename pass_t >
479	const ast::Decl * ast::Pass< pass_t >::visit( const ast::UnionDecl * node ) {
480	VISIT_START( node );
481
482	// make up a forward declaration and add it before processing the members
483	__pass::indexer::addUnionFwd( pass, 0, node );
484
485	VISIT({
486	guard_indexer guard { * this };
487	maybe_accept( node, &UnionDecl::params );
488	maybe_accept( node, &UnionDecl::members );
489	})
490
491	__pass::indexer::addUnion( pass, 0, node );
492
493	VISIT_END( Decl, node );
494	}
495
496	//--------------------------------------------------------------------------
497	// EnumDecl
498	template< typename pass_t >
499	const ast::Decl * ast::Pass< pass_t >::visit( const ast::EnumDecl * node ) {
500	VISIT_START( node );
501
502	__pass::indexer::addEnum( pass, 0, node );
503
504	VISIT(
505	// unlike structs, traits, and unions, enums inject their members into the global scope
506	maybe_accept( node, &EnumDecl::params );
507	maybe_accept( node, &EnumDecl::members );
508	)
509
510	VISIT_END( Decl, node );
511	}
512
513	//--------------------------------------------------------------------------
514	// TraitDecl
515	template< typename pass_t >
516	const ast::Decl * ast::Pass< pass_t >::visit( const ast::TraitDecl * node ) {
517	VISIT_START( node );
518
519	VISIT({
520	guard_indexer guard { *this };
521	maybe_accept( node, &TraitDecl::params );
522	maybe_accept( node, &TraitDecl::members );
523	})
524
525	__pass::indexer::addTrait( pass, 0, node );
526
527	VISIT_END( Decl, node );
528	}
529
530	//--------------------------------------------------------------------------
531	// TypeDecl
532	template< typename pass_t >
533	const ast::Decl * ast::Pass< pass_t >::visit( const ast::TypeDecl * node ) {
534	VISIT_START( node );
535
536	VISIT({
537	guard_indexer guard { *this };
538	maybe_accept( node, &TypeDecl::params );
539	maybe_accept( node, &TypeDecl::base );
540	})
541
542	// see A NOTE ON THE ORDER OF TRAVERSAL, above
543	// note that assertions come after the type is added to the symtab, since they are not part of the type proper
544	// and may depend on the type itself
545	__pass::indexer::addType( pass, 0, node );
546
547	VISIT(
548	maybe_accept( node, &TypeDecl::assertions );
549
550	{
551	guard_indexer guard { *this };
552	maybe_accept( node, &TypeDecl::init );
553	}
554	)
555
556	VISIT_END( Decl, node );
557	}
558
559	//--------------------------------------------------------------------------
560	// TypedefDecl
561	template< typename pass_t >
562	const ast::Decl * ast::Pass< pass_t >::visit( const ast::TypedefDecl * node ) {
563	VISIT_START( node );
564
565	VISIT({
566	guard_indexer guard { *this };
567	maybe_accept( node, &TypedefDecl::params );
568	maybe_accept( node, &TypedefDecl::base );
569	})
570
571	__pass::indexer::addType( pass, 0, node );
572
573	VISIT( maybe_accept( node, &TypedefDecl::assertions ); )
574
575	VISIT_END( Decl, node );
576	}
577
578	//--------------------------------------------------------------------------
579	// AsmDecl
580	template< typename pass_t >
581	const ast::AsmDecl * ast::Pass< pass_t >::visit( const ast::AsmDecl * node ) {
582	VISIT_START( node );
583
584	VISIT(
585	maybe_accept( node, &AsmDecl::stmt );
586	)
587
588	VISIT_END( AsmDecl, node );
589	}
590
591	//--------------------------------------------------------------------------
592	// StaticAssertDecl
593	template< typename pass_t >
594	const ast::StaticAssertDecl * ast::Pass< pass_t >::visit( const ast::StaticAssertDecl * node ) {
595	VISIT_START( node );
596
597	VISIT(
598	maybe_accept( node, &StaticAssertDecl::cond );
599	maybe_accept( node, &StaticAssertDecl::msg );
600	)
601
602	VISIT_END( StaticAssertDecl, node );
603	}
604
605	//--------------------------------------------------------------------------
606	// CompoundStmt
607	template< typename pass_t >
608	const ast::CompoundStmt * ast::Pass< pass_t >::visit( const ast::CompoundStmt * node ) {
609	VISIT_START( node );
610	VISIT({
611	// do not enter a new scope if inFunction is true - needs to check old state before the assignment
612	auto guard1 = makeFuncGuard( [this, inFunction = this->inFunction]() {
613	if ( ! inFunction ) __pass::indexer::enter(pass, 0);
614	}, [this, inFunction = this->inFunction]() {
615	if ( ! inFunction ) __pass::indexer::leave(pass, 0);
616	});
617	ValueGuard< bool > guard2( inFunction );
618	guard_scope guard3 { *this };
619	inFunction = false;
620	maybe_accept( node, &CompoundStmt::kids );
621	})
622	VISIT_END( CompoundStmt, node );
623	}
624
625	//--------------------------------------------------------------------------
626	// ExprStmt
627	template< typename pass_t >
628	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::ExprStmt * node ) {
629	VISIT_START( node );
630
631	VISIT(
632	maybe_accept( node, &ExprStmt::expr );
633	)
634
635	VISIT_END( Stmt, node );
636	}
637
638	//--------------------------------------------------------------------------
639	// AsmStmt
640	template< typename pass_t >
641	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::AsmStmt * node ) {
642	VISIT_START( node )
643
644	VISIT(
645	maybe_accept( node, &AsmStmt::instruction );
646	maybe_accept( node, &AsmStmt::output );
647	maybe_accept( node, &AsmStmt::input );
648	maybe_accept( node, &AsmStmt::clobber );
649	)
650
651	VISIT_END( Stmt, node );
652	}
653
654	//--------------------------------------------------------------------------
655	// DirectiveStmt
656	template< typename pass_t >
657	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::DirectiveStmt * node ) {
658	VISIT_START( node )
659
660	VISIT_END( Stmt, node );
661	}
662
663	//--------------------------------------------------------------------------
664	// IfStmt
665	template< typename pass_t >
666	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::IfStmt * node ) {
667	VISIT_START( node );
668
669	VISIT({
670	// if statements introduce a level of scope (for the initialization)
671	guard_indexer guard { *this };
672	maybe_accept( node, &IfStmt::inits );
673	maybe_accept( node, &IfStmt::cond );
674	maybe_accept( node, &IfStmt::thenPart );
675	maybe_accept( node, &IfStmt::elsePart );
676	})
677
678	VISIT_END( Stmt, node );
679	}
680
681	//--------------------------------------------------------------------------
682	// WhileStmt
683	template< typename pass_t >
684	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::WhileStmt * node ) {
685	VISIT_START( node );
686
687	VISIT({
688	// while statements introduce a level of scope (for the initialization)
689	guard_indexer guard { *this };
690	maybe_accept( node, &WhileStmt::inits );
691	maybe_accept( node, &WhileStmt::cond );
692	maybe_accept( node, &WhileStmt::body );
693	})
694
695	VISIT_END( Stmt, node );
696	}
697
698	//--------------------------------------------------------------------------
699	// ForStmt
700	template< typename pass_t >
701	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::ForStmt * node ) {
702	VISIT_START( node );
703
704	VISIT({
705	// for statements introduce a level of scope (for the initialization)
706	guard_indexer guard { *this };
707	maybe_accept( node, &ForStmt::inits );
708	maybe_accept( node, &ForStmt::cond );
709	maybe_accept( node, &ForStmt::inc );
710	maybe_accept( node, &ForStmt::body );
711	})
712
713	VISIT_END( Stmt, node );
714	}
715
716	//--------------------------------------------------------------------------
717	// SwitchStmt
718	template< typename pass_t >
719	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::SwitchStmt * node ) {
720	VISIT_START( node );
721
722	VISIT(
723	maybe_accept( node, &SwitchStmt::cond );
724	maybe_accept( node, &SwitchStmt::stmts );
725	)
726
727	VISIT_END( Stmt, node );
728	}
729
730	//--------------------------------------------------------------------------
731	// CaseStmt
732	template< typename pass_t >
733	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::CaseStmt * node ) {
734	VISIT_START( node );
735
736	VISIT(
737	maybe_accept( node, &CaseStmt::cond );
738	maybe_accept( node, &CaseStmt::stmts );
739	)
740
741	VISIT_END( Stmt, node );
742	}
743
744	//--------------------------------------------------------------------------
745	// BranchStmt
746	template< typename pass_t >
747	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::BranchStmt * node ) {
748	VISIT_START( node );
749	VISIT_END( Stmt, node );
750	}
751
752	//--------------------------------------------------------------------------
753	// ReturnStmt
754	template< typename pass_t >
755	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::ReturnStmt * node ) {
756	VISIT_START( node );
757
758	VISIT(
759	maybe_accept( node, &ReturnStmt::expr );
760	)
761
762	VISIT_END( Stmt, node );
763	}
764
765	//--------------------------------------------------------------------------
766	// ThrowStmt
767	template< typename pass_t >
768	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::ThrowStmt * node ) {
769	VISIT_START( node );
770
771	VISIT(
772	maybe_accept( node, &ThrowStmt::expr );
773	maybe_accept( node, &ThrowStmt::target );
774	)
775
776	VISIT_END( Stmt, node );
777	}
778
779	//--------------------------------------------------------------------------
780	// TryStmt
781	template< typename pass_t >
782	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::TryStmt * node ) {
783	VISIT_START( node );
784
785	VISIT(
786	maybe_accept( node, &TryStmt::body );
787	maybe_accept( node, &TryStmt::handlers );
788	maybe_accept( node, &TryStmt::finally );
789	)
790
791	VISIT_END( Stmt, node );
792	}
793
794	//--------------------------------------------------------------------------
795	// CatchStmt
796	template< typename pass_t >
797	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::CatchStmt * node ) {
798	VISIT_START( node );
799
800	VISIT({
801	// catch statements introduce a level of scope (for the caught exception)
802	guard_indexer guard { *this };
803	maybe_accept( node, &CatchStmt::decl );
804	maybe_accept( node, &CatchStmt::cond );
805	maybe_accept( node, &CatchStmt::body );
806	})
807
808	VISIT_END( Stmt, node );
809	}
810
811	//--------------------------------------------------------------------------
812	// FinallyStmt
813	template< typename pass_t >
814	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::FinallyStmt * node ) {
815	VISIT_START( node );
816
817	VISIT(
818	maybe_accept( node, &FinallyStmt::body );
819	)
820
821	VISIT_END( Stmt, node );
822	}
823
824	//--------------------------------------------------------------------------
825	// WaitForStmt
826	template< typename pass_t >
827	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::WaitForStmt * node ) {
828	VISIT_START( node );
829	// for( auto & clause : node->clauses ) {
830	// maybeAccept_impl( clause.target.function, *this );
831	// maybeAccept_impl( clause.target.arguments, *this );
832
833	// maybeAccept_impl( clause.statement, *this );
834	// maybeAccept_impl( clause.condition, *this );
835	// }
836
837	VISIT({
838	std::vector<WaitForStmt::Clause> new_clauses;
839	new_clauses.reserve( node->clauses.size() );
840	bool mutated = false;
841	for( const auto & clause : node->clauses ) {
842
843	const Expr * func = clause.target.func ? clause.target.func->accept(*this) : nullptr;
844	if(func != clause.target.func) mutated = true;
845
846	std::vector<ptr<Expr>> new_args;
847	new_args.reserve(clause.target.args.size());
848	for( const auto & arg : clause.target.args ) {
849	auto a = arg->accept(*this);
850	new_args.push_back( a );
851	if( a != arg ) mutated = true;
852	}
853
854	const Stmt * stmt = clause.stmt ? clause.stmt->accept(*this) : nullptr;
855	if(stmt != clause.stmt) mutated = true;
856
857	const Expr * cond = clause.cond ? clause.cond->accept(*this) : nullptr;
858	if(cond != clause.cond) mutated = true;
859
860	new_clauses.push_back( WaitForStmt::Clause{ {func, std::move(new_args) }, stmt, cond } );
861	}
862
863	if(mutated) {
864	auto n = mutate(node);
865	n->clauses = std::move( new_clauses );
866	node = n;
867	}
868	})
869
870	#define maybe_accept(field) \
871	if(node->field) { \
872	auto nval = call_accept( node->field ); \
873	if(nval != node->field ) { \
874	auto nparent = mutate(node); \
875	nparent->field = nval; \
876	node = nparent; \
877	} \
878	}
879
880	VISIT(
881	maybe_accept( timeout.time );
882	maybe_accept( timeout.stmt );
883	maybe_accept( timeout.cond );
884	maybe_accept( orElse.stmt );
885	maybe_accept( orElse.cond );
886	)
887
888	#undef maybe_accept
889
890	VISIT_END( Stmt, node );
891	}
892
893	//--------------------------------------------------------------------------
894	// WithStmt
895	template< typename pass_t >
896	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::WithStmt * node ) {
897	VISIT_START( node );
898
899	VISIT(
900	maybe_accept( node, &WithStmt::exprs );
901	{
902	// catch statements introduce a level of scope (for the caught exception)
903	guard_indexer guard { *this };
904	__pass::indexer::addWith( pass, 0, node->exprs, node );
905	maybe_accept( node, &WithStmt::stmt );
906	}
907	)
908	VISIT_END( Stmt, node );
909	}
910
911	//--------------------------------------------------------------------------
912	// NullStmt
913	template< typename pass_t >
914	const ast::NullStmt * ast::Pass< pass_t >::visit( const ast::NullStmt * node ) {
915	VISIT_START( node );
916	VISIT_END( NullStmt, node );
917	}
918
919	//--------------------------------------------------------------------------
920	// DeclStmt
921	template< typename pass_t >
922	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::DeclStmt * node ) {
923	VISIT_START( node );
924
925	VISIT(
926	maybe_accept( node, &DeclStmt::decl );
927	)
928
929	VISIT_END( Stmt, node );
930	}
931
932	//--------------------------------------------------------------------------
933	// ImplicitCtorDtorStmt
934	template< typename pass_t >
935	const ast::Stmt * ast::Pass< pass_t >::visit( const ast::ImplicitCtorDtorStmt * node ) {
936	VISIT_START( node );
937
938	// For now this isn't visited, it is unclear if this causes problem
939	// if all tests are known to pass, remove this code
940	// VISIT(
941	// maybe_accept( node, &ImplicitCtorDtorStmt::callStmt );
942	// )
943
944	VISIT_END( Stmt, node );
945	}
946
947	//--------------------------------------------------------------------------
948	// ApplicationExpr
949	template< typename pass_t >
950	const ast::Expr * ast::Pass< pass_t >::visit( const ast::ApplicationExpr * node ) {
951	VISIT_START( node );
952
953	VISIT(
954	{
955	guard_indexer guard { *this };
956	maybe_accept( node, &ApplicationExpr::result );
957	}
958	maybe_accept( node, &ApplicationExpr::func );
959	maybe_accept( node, &ApplicationExpr::args );
960	)
961
962	VISIT_END( Expr, node );
963	}
964
965	//--------------------------------------------------------------------------
966	// UntypedExpr
967	template< typename pass_t >
968	const ast::Expr * ast::Pass< pass_t >::visit( const ast::UntypedExpr * node ) {
969	VISIT_START( node );
970
971	VISIT(
972	{
973	guard_indexer guard { *this };
974	maybe_accept( node, &UntypedExpr::result );
975	}
976
977	maybe_accept( node, &UntypedExpr::args );
978	)
979
980	VISIT_END( Expr, node );
981	}
982
983	//--------------------------------------------------------------------------
984	// NameExpr
985	template< typename pass_t >
986	const ast::Expr * ast::Pass< pass_t >::visit( const ast::NameExpr * node ) {
987	VISIT_START( node );
988
989	VISIT({
990	guard_indexer guard { *this };
991	maybe_accept( node, &NameExpr::result );
992	})
993
994	VISIT_END( Expr, node );
995	}
996
997	//--------------------------------------------------------------------------
998	// CastExpr
999	template< typename pass_t >
1000	const ast::Expr * ast::Pass< pass_t >::visit( const ast::CastExpr * node ) {
1001	VISIT_START( node );
1002
1003	VISIT({
1004	guard_indexer guard { *this };
1005	maybe_accept( node, &CastExpr::result );
1006	}
1007	maybe_accept( node, &CastExpr::arg );
1008	)
1009
1010	VISIT_END( Expr, node );
1011	}
1012
1013	//--------------------------------------------------------------------------
1014	// KeywordCastExpr
1015	template< typename pass_t >
1016	const ast::Expr * ast::Pass< pass_t >::visit( const ast::KeywordCastExpr * node ) {
1017	VISIT_START( node );
1018
1019	VISIT({
1020	guard_indexer guard { *this };
1021	maybe_accept( node, &KeywordCastExpr::result );
1022	}
1023	maybe_accept( node, &KeywordCastExpr::arg );
1024	)
1025
1026	VISIT_END( Expr, node );
1027	}
1028
1029	//--------------------------------------------------------------------------
1030	// VirtualCastExpr
1031	template< typename pass_t >
1032	const ast::Expr * ast::Pass< pass_t >::visit( const ast::VirtualCastExpr * node ) {
1033	VISIT_START( node );
1034
1035	VISIT({
1036	guard_indexer guard { *this };
1037	maybe_accept( node, &VirtualCastExpr::result );
1038	}
1039	maybe_accept( node, &VirtualCastExpr::arg );
1040	)
1041
1042	VISIT_END( Expr, node );
1043	}
1044
1045	//--------------------------------------------------------------------------
1046	// AddressExpr
1047	template< typename pass_t >
1048	const ast::Expr * ast::Pass< pass_t >::visit( const ast::AddressExpr * node ) {
1049	VISIT_START( node );
1050
1051	VISIT({
1052	guard_indexer guard { *this };
1053	maybe_accept( node, &AddressExpr::result );
1054	}
1055	maybe_accept( node, &AddressExpr::arg );
1056	)
1057
1058	VISIT_END( Expr, node );
1059	}
1060
1061	//--------------------------------------------------------------------------
1062	// LabelAddressExpr
1063	template< typename pass_t >
1064	const ast::Expr * ast::Pass< pass_t >::visit( const ast::LabelAddressExpr * node ) {
1065	VISIT_START( node );
1066
1067	VISIT({
1068	guard_indexer guard { *this };
1069	maybe_accept( node, &LabelAddressExpr::result );
1070	})
1071
1072	VISIT_END( Expr, node );
1073	}
1074
1075	//--------------------------------------------------------------------------
1076	// UntypedMemberExpr
1077	template< typename pass_t >
1078	const ast::Expr * ast::Pass< pass_t >::visit( const ast::UntypedMemberExpr * node ) {
1079	VISIT_START( node );
1080
1081	VISIT({
1082	guard_indexer guard { *this };
1083	maybe_accept( node, &UntypedMemberExpr::result );
1084	}
1085	maybe_accept( node, &UntypedMemberExpr::aggregate );
1086	maybe_accept( node, &UntypedMemberExpr::member );
1087	)
1088
1089	VISIT_END( Expr, node );
1090	}
1091
1092	//--------------------------------------------------------------------------
1093	// MemberExpr
1094	template< typename pass_t >
1095	const ast::Expr * ast::Pass< pass_t >::visit( const ast::MemberExpr * node ) {
1096	VISIT_START( node );
1097
1098	VISIT({
1099	guard_indexer guard { *this };
1100	maybe_accept( node, &MemberExpr::result );
1101	}
1102	maybe_accept( node, &MemberExpr::aggregate );
1103	)
1104
1105	VISIT_END( Expr, node );
1106	}
1107
1108	//--------------------------------------------------------------------------
1109	// VariableExpr
1110	template< typename pass_t >
1111	const ast::Expr * ast::Pass< pass_t >::visit( const ast::VariableExpr * node ) {
1112	VISIT_START( node );
1113
1114	VISIT({
1115	guard_indexer guard { *this };
1116	maybe_accept( node, &VariableExpr::result );
1117	})
1118
1119	VISIT_END( Expr, node );
1120	}
1121
1122	//--------------------------------------------------------------------------
1123	// ConstantExpr
1124	template< typename pass_t >
1125	const ast::Expr * ast::Pass< pass_t >::visit( const ast::ConstantExpr * node ) {
1126	VISIT_START( node );
1127
1128	VISIT({
1129	guard_indexer guard { *this };
1130	maybe_accept( node, &ConstantExpr::result );
1131	})
1132
1133	VISIT_END( Expr, node );
1134	}
1135
1136	//--------------------------------------------------------------------------
1137	// SizeofExpr
1138	template< typename pass_t >
1139	const ast::Expr * ast::Pass< pass_t >::visit( const ast::SizeofExpr * node ) {
1140	VISIT_START( node );
1141
1142	VISIT({
1143	guard_indexer guard { *this };
1144	maybe_accept( node, &SizeofExpr::result );
1145	}
1146	if ( node->type ) {
1147	maybe_accept( node, &SizeofExpr::type );
1148	} else {
1149	maybe_accept( node, &SizeofExpr::expr );
1150	}
1151	)
1152
1153	VISIT_END( Expr, node );
1154	}
1155
1156	//--------------------------------------------------------------------------
1157	// AlignofExpr
1158	template< typename pass_t >
1159	const ast::Expr * ast::Pass< pass_t >::visit( const ast::AlignofExpr * node ) {
1160	VISIT_START( node );
1161
1162	VISIT({
1163	guard_indexer guard { *this };
1164	maybe_accept( node, &AlignofExpr::result );
1165	}
1166	if ( node->type ) {
1167	maybe_accept( node, &AlignofExpr::type );
1168	} else {
1169	maybe_accept( node, &AlignofExpr::expr );
1170	}
1171	)
1172
1173	VISIT_END( Expr, node );
1174	}
1175
1176	//--------------------------------------------------------------------------
1177	// UntypedOffsetofExpr
1178	template< typename pass_t >
1179	const ast::Expr * ast::Pass< pass_t >::visit( const ast::UntypedOffsetofExpr * node ) {
1180	VISIT_START( node );
1181
1182	VISIT({
1183	guard_indexer guard { *this };
1184	maybe_accept( node, &UntypedOffsetofExpr::result );
1185	}
1186	maybe_accept( node, &UntypedOffsetofExpr::type );
1187	)
1188
1189	VISIT_END( Expr, node );
1190	}
1191
1192	//--------------------------------------------------------------------------
1193	// OffsetofExpr
1194	template< typename pass_t >
1195	const ast::Expr * ast::Pass< pass_t >::visit( const ast::OffsetofExpr * node ) {
1196	VISIT_START( node );
1197
1198	VISIT({
1199	guard_indexer guard { *this };
1200	maybe_accept( node, &OffsetofExpr::result );
1201	}
1202	maybe_accept( node, &OffsetofExpr::type );
1203	)
1204
1205	VISIT_END( Expr, node );
1206	}
1207
1208	//--------------------------------------------------------------------------
1209	// OffsetPackExpr
1210	template< typename pass_t >
1211	const ast::Expr * ast::Pass< pass_t >::visit( const ast::OffsetPackExpr * node ) {
1212	VISIT_START( node );
1213
1214	VISIT({
1215	guard_indexer guard { *this };
1216	maybe_accept( node, &OffsetPackExpr::result );
1217	}
1218	maybe_accept( node, &OffsetPackExpr::type );
1219	)
1220
1221	VISIT_END( Expr, node );
1222	}
1223
1224	//--------------------------------------------------------------------------
1225	// LogicalExpr
1226	template< typename pass_t >
1227	const ast::Expr * ast::Pass< pass_t >::visit( const ast::LogicalExpr * node ) {
1228	VISIT_START( node );
1229
1230	VISIT({
1231	guard_indexer guard { *this };
1232	maybe_accept( node, &LogicalExpr::result );
1233	}
1234	maybe_accept( node, &LogicalExpr::arg1 );
1235	maybe_accept( node, &LogicalExpr::arg2 );
1236	)
1237
1238	VISIT_END( Expr, node );
1239	}
1240
1241	//--------------------------------------------------------------------------
1242	// ConditionalExpr
1243	template< typename pass_t >
1244	const ast::Expr * ast::Pass< pass_t >::visit( const ast::ConditionalExpr * node ) {
1245	VISIT_START( node );
1246
1247	VISIT({
1248	guard_indexer guard { *this };
1249	maybe_accept( node, &ConditionalExpr::result );
1250	}
1251	maybe_accept( node, &ConditionalExpr::arg1 );
1252	maybe_accept( node, &ConditionalExpr::arg2 );
1253	maybe_accept( node, &ConditionalExpr::arg3 );
1254	)
1255
1256	VISIT_END( Expr, node );
1257	}
1258
1259	//--------------------------------------------------------------------------
1260	// CommaExpr
1261	template< typename pass_t >
1262	const ast::Expr * ast::Pass< pass_t >::visit( const ast::CommaExpr * node ) {
1263	VISIT_START( node );
1264
1265	VISIT({
1266	guard_indexer guard { *this };
1267	maybe_accept( node, &CommaExpr::result );
1268	}
1269	maybe_accept( node, &CommaExpr::arg1 );
1270	maybe_accept( node, &CommaExpr::arg2 );
1271	)
1272
1273	VISIT_END( Expr, node );
1274	}
1275
1276	//--------------------------------------------------------------------------
1277	// TypeExpr
1278	template< typename pass_t >
1279	const ast::Expr * ast::Pass< pass_t >::visit( const ast::TypeExpr * node ) {
1280	VISIT_START( node );
1281
1282	VISIT({
1283	guard_indexer guard { *this };
1284	maybe_accept( node, &TypeExpr::result );
1285	}
1286	maybe_accept( node, &TypeExpr::type );
1287	)
1288
1289	VISIT_END( Expr, node );
1290	}
1291
1292	//--------------------------------------------------------------------------
1293	// AsmExpr
1294	template< typename pass_t >
1295	const ast::Expr * ast::Pass< pass_t >::visit( const ast::AsmExpr * node ) {
1296	VISIT_START( node );
1297
1298	VISIT({
1299	guard_indexer guard { *this };
1300	maybe_accept( node, &AsmExpr::result );
1301	}
1302	maybe_accept( node, &AsmExpr::inout );
1303	maybe_accept( node, &AsmExpr::constraint );
1304	maybe_accept( node, &AsmExpr::operand );
1305	)
1306
1307	VISIT_END( Expr, node );
1308	}
1309
1310	//--------------------------------------------------------------------------
1311	// ImplicitCopyCtorExpr
1312	template< typename pass_t >
1313	const ast::Expr * ast::Pass< pass_t >::visit( const ast::ImplicitCopyCtorExpr * node ) {
1314	VISIT_START( node );
1315
1316	VISIT({
1317	guard_indexer guard { *this };
1318	maybe_accept( node, &ImplicitCopyCtorExpr::result );
1319	}
1320	maybe_accept( node, &ImplicitCopyCtorExpr::callExpr );
1321	)
1322
1323	VISIT_END( Expr, node );
1324	}
1325
1326	//--------------------------------------------------------------------------
1327	// ConstructorExpr
1328	template< typename pass_t >
1329	const ast::Expr * ast::Pass< pass_t >::visit( const ast::ConstructorExpr * node ) {
1330	VISIT_START( node );
1331
1332	VISIT({
1333	guard_indexer guard { *this };
1334	maybe_accept( node, &ConstructorExpr::result );
1335	}
1336	maybe_accept( node, &ConstructorExpr::callExpr );
1337	)
1338
1339	VISIT_END( Expr, node );
1340	}
1341
1342	//--------------------------------------------------------------------------
1343	// CompoundLiteralExpr
1344	template< typename pass_t >
1345	const ast::Expr * ast::Pass< pass_t >::visit( const ast::CompoundLiteralExpr * node ) {
1346	VISIT_START( node );
1347
1348	VISIT({
1349	guard_indexer guard { *this };
1350	maybe_accept( node, &CompoundLiteralExpr::result );
1351	}
1352	maybe_accept( node, &CompoundLiteralExpr::init );
1353	)
1354
1355	VISIT_END( Expr, node );
1356	}
1357
1358	//--------------------------------------------------------------------------
1359	// RangeExpr
1360	template< typename pass_t >
1361	const ast::Expr * ast::Pass< pass_t >::visit( const ast::RangeExpr * node ) {
1362	VISIT_START( node );
1363
1364	VISIT({
1365	guard_indexer guard { *this };
1366	maybe_accept( node, &RangeExpr::result );
1367	}
1368	maybe_accept( node, &RangeExpr::low );
1369	maybe_accept( node, &RangeExpr::high );
1370	)
1371
1372	VISIT_END( Expr, node );
1373	}
1374
1375	//--------------------------------------------------------------------------
1376	// UntypedTupleExpr
1377	template< typename pass_t >
1378	const ast::Expr * ast::Pass< pass_t >::visit( const ast::UntypedTupleExpr * node ) {
1379	VISIT_START( node );
1380
1381	VISIT({
1382	guard_indexer guard { *this };
1383	maybe_accept( node, &UntypedTupleExpr::result );
1384	}
1385	maybe_accept( node, &UntypedTupleExpr::exprs );
1386	)
1387
1388	VISIT_END( Expr, node );
1389	}
1390
1391	//--------------------------------------------------------------------------
1392	// TupleExpr
1393	template< typename pass_t >
1394	const ast::Expr * ast::Pass< pass_t >::visit( const ast::TupleExpr * node ) {
1395	VISIT_START( node );
1396
1397	VISIT({
1398	guard_indexer guard { *this };
1399	maybe_accept( node, &TupleExpr::result );
1400	}
1401	maybe_accept( node, &TupleExpr::exprs );
1402	)
1403
1404	VISIT_END( Expr, node );
1405	}
1406
1407	//--------------------------------------------------------------------------
1408	// TupleIndexExpr
1409	template< typename pass_t >
1410	const ast::Expr * ast::Pass< pass_t >::visit( const ast::TupleIndexExpr * node ) {
1411	VISIT_START( node );
1412
1413	VISIT({
1414	guard_indexer guard { *this };
1415	maybe_accept( node, &TupleIndexExpr::result );
1416	}
1417	maybe_accept( node, &TupleIndexExpr::tuple );
1418	)
1419
1420	VISIT_END( Expr, node );
1421	}
1422
1423	//--------------------------------------------------------------------------
1424	// TupleAssignExpr
1425	template< typename pass_t >
1426	const ast::Expr * ast::Pass< pass_t >::visit( const ast::TupleAssignExpr * node ) {
1427	VISIT_START( node );
1428
1429	VISIT({
1430	guard_indexer guard { *this };
1431	maybe_accept( node, &TupleAssignExpr::result );
1432	}
1433	maybe_accept( node, &TupleAssignExpr::stmtExpr );
1434	)
1435
1436	VISIT_END( Expr, node );
1437	}
1438
1439	//--------------------------------------------------------------------------
1440	// StmtExpr
1441	template< typename pass_t >
1442	const ast::Expr * ast::Pass< pass_t >::visit( const ast::StmtExpr * node ) {
1443	VISIT_START( node );
1444
1445	VISIT(// don't want statements from outer CompoundStmts to be added to this StmtExpr
1446	// get the stmts that will need to be spliced in
1447	auto stmts_before = __pass::stmtsToAddBefore( pass, 0);
1448	auto stmts_after = __pass::stmtsToAddAfter ( pass, 0);
1449
1450	// These may be modified by subnode but most be restored once we exit this statemnet.
1451	ValueGuardPtr< const ast::TypeSubstitution * > __old_env( __pass::env( pass, 0) );
1452	ValueGuardPtr< typename std::remove_pointer< decltype(stmts_before) >::type > __old_decls_before( stmts_before );
1453	ValueGuardPtr< typename std::remove_pointer< decltype(stmts_after ) >::type > __old_decls_after ( stmts_after );
1454
1455	{
1456	guard_indexer guard { *this };
1457	maybe_accept( node, &StmtExpr::result );
1458	}
1459	maybe_accept( node, &StmtExpr::stmts );
1460	maybe_accept( node, &StmtExpr::returnDecls );
1461	maybe_accept( node, &StmtExpr::dtors );
1462	)
1463
1464	VISIT_END( Expr, node );
1465	}
1466
1467	//--------------------------------------------------------------------------
1468	// UniqueExpr
1469	template< typename pass_t >
1470	const ast::Expr * ast::Pass< pass_t >::visit( const ast::UniqueExpr * node ) {
1471	VISIT_START( node );
1472
1473	VISIT({
1474	guard_indexer guard { *this };
1475	maybe_accept( node, &UniqueExpr::result );
1476	}
1477	maybe_accept( node, &UniqueExpr::expr );
1478	)
1479
1480	VISIT_END( Expr, node );
1481	}
1482
1483	//--------------------------------------------------------------------------
1484	// UntypedInitExpr
1485	template< typename pass_t >
1486	const ast::Expr * ast::Pass< pass_t >::visit( const ast::UntypedInitExpr * node ) {
1487	VISIT_START( node );
1488
1489	VISIT({
1490	guard_indexer guard { *this };
1491	maybe_accept( node, &UntypedInitExpr::result );
1492	}
1493	maybe_accept( node, &UntypedInitExpr::expr );
1494	// not currently visiting initAlts, but this doesn't matter since this node is only used in the resolver.
1495	)
1496
1497	VISIT_END( Expr, node );
1498	}
1499
1500	//--------------------------------------------------------------------------
1501	// InitExpr
1502	template< typename pass_t >
1503	const ast::Expr * ast::Pass< pass_t >::visit( const ast::InitExpr * node ) {
1504	VISIT_START( node );
1505
1506	VISIT({
1507	guard_indexer guard { *this };
1508	maybe_accept( node, &InitExpr::result );
1509	}
1510	maybe_accept( node, &InitExpr::expr );
1511	maybe_accept( node, &InitExpr::designation );
1512	)
1513
1514	VISIT_END( Expr, node );
1515	}
1516
1517	//--------------------------------------------------------------------------
1518	// DeletedExpr
1519	template< typename pass_t >
1520	const ast::Expr * ast::Pass< pass_t >::visit( const ast::DeletedExpr * node ) {
1521	VISIT_START( node );
1522
1523	VISIT({
1524	guard_indexer guard { *this };
1525	maybe_accept( node, &DeletedExpr::result );
1526	}
1527	maybe_accept( node, &DeletedExpr::expr );
1528	// don't visit deleteStmt, because it is a pointer to somewhere else in the tree.
1529	)
1530
1531	VISIT_END( Expr, node );
1532	}
1533
1534	//--------------------------------------------------------------------------
1535	// DefaultArgExpr
1536	template< typename pass_t >
1537	const ast::Expr * ast::Pass< pass_t >::visit( const ast::DefaultArgExpr * node ) {
1538	VISIT_START( node );
1539
1540	VISIT({
1541	guard_indexer guard { *this };
1542	maybe_accept( node, &DefaultArgExpr::result );
1543	}
1544	maybe_accept( node, &DefaultArgExpr::expr );
1545	)
1546
1547	VISIT_END( Expr, node );
1548	}
1549
1550	//--------------------------------------------------------------------------
1551	// GenericExpr
1552	template< typename pass_t >
1553	const ast::Expr * ast::Pass< pass_t >::visit( const ast::GenericExpr * node ) {
1554	VISIT_START( node );
1555
1556	VISIT({
1557	guard_indexer guard { *this };
1558	maybe_accept( node, &GenericExpr::result );
1559	}
1560	maybe_accept( node, &GenericExpr::control );
1561
1562	std::vector<GenericExpr::Association> new_kids;
1563	new_kids.reserve(node->associations.size());
1564	bool mutated = false;
1565	for( const auto & assoc : node->associations ) {
1566	const Type * type = nullptr;
1567	if( assoc.type ) {
1568	guard_indexer guard { *this };
1569	type = assoc.type->accept( *this );
1570	if( type != assoc.type ) mutated = true;
1571	}
1572	const Expr * expr = nullptr;
1573	if( assoc.expr ) {
1574	expr = assoc.expr->accept( *this );
1575	if( expr != assoc.expr ) mutated = true;
1576	}
1577	new_kids.emplace_back( type, expr );
1578	}
1579
1580	if(mutated) {
1581	auto n = mutate(node);
1582	n->associations = std::move( new_kids );
1583	node = n;
1584	}
1585	)
1586
1587	VISIT_END( Expr, node );
1588	}
1589
1590	//--------------------------------------------------------------------------
1591	// VoidType
1592	template< typename pass_t >
1593	const ast::Type * ast::Pass< pass_t >::visit( const ast::VoidType * node ) {
1594	VISIT_START( node );
1595
1596	VISIT_END( Type, node );
1597	}
1598
1599	//--------------------------------------------------------------------------
1600	// BasicType
1601	template< typename pass_t >
1602	const ast::Type * ast::Pass< pass_t >::visit( const ast::BasicType * node ) {
1603	VISIT_START( node );
1604
1605	VISIT_END( Type, node );
1606	}
1607
1608	//--------------------------------------------------------------------------
1609	// PointerType
1610	template< typename pass_t >
1611	const ast::Type * ast::Pass< pass_t >::visit( const ast::PointerType * node ) {
1612	VISIT_START( node );
1613
1614	VISIT(
1615	// xxx - should PointerType visit/mutate dimension?
1616	maybe_accept( node, &PointerType::base );
1617	)
1618
1619	VISIT_END( Type, node );
1620	}
1621
1622	//--------------------------------------------------------------------------
1623	// ArrayType
1624	template< typename pass_t >
1625	const ast::Type * ast::Pass< pass_t >::visit( const ast::ArrayType * node ) {
1626	VISIT_START( node );
1627
1628	VISIT(
1629	maybe_accept( node, &ArrayType::dimension );
1630	maybe_accept( node, &ArrayType::base );
1631	)
1632
1633	VISIT_END( Type, node );
1634	}
1635
1636	//--------------------------------------------------------------------------
1637	// ReferenceType
1638	template< typename pass_t >
1639	const ast::Type * ast::Pass< pass_t >::visit( const ast::ReferenceType * node ) {
1640	VISIT_START( node );
1641
1642	VISIT(
1643	maybe_accept( node, &ReferenceType::base );
1644	)
1645
1646	VISIT_END( Type, node );
1647	}
1648
1649	//--------------------------------------------------------------------------
1650	// QualifiedType
1651	template< typename pass_t >
1652	const ast::Type * ast::Pass< pass_t >::visit( const ast::QualifiedType * node ) {
1653	VISIT_START( node );
1654
1655	VISIT(
1656	maybe_accept( node, &QualifiedType::parent );
1657	maybe_accept( node, &QualifiedType::child );
1658	)
1659
1660	VISIT_END( Type, node );
1661	}
1662
1663	//--------------------------------------------------------------------------
1664	// FunctionType
1665	template< typename pass_t >
1666	const ast::Type * ast::Pass< pass_t >::visit( const ast::FunctionType * node ) {
1667	VISIT_START( node );
1668
1669	VISIT(
1670	maybe_accept( node, &FunctionType::forall );
1671	maybe_accept( node, &FunctionType::returns );
1672	maybe_accept( node, &FunctionType::params );
1673	)
1674
1675	VISIT_END( Type, node );
1676	}
1677
1678	//--------------------------------------------------------------------------
1679	// StructInstType
1680	template< typename pass_t >
1681	const ast::Type * ast::Pass< pass_t >::visit( const ast::StructInstType * node ) {
1682	VISIT_START( node );
1683
1684	__pass::indexer::addStruct( pass, 0, node->name );
1685
1686	VISIT({
1687	guard_indexer guard { *this };
1688	maybe_accept( node, &StructInstType::forall );
1689	maybe_accept( node, &StructInstType::params );
1690	})
1691
1692	VISIT_END( Type, node );
1693	}
1694
1695	//--------------------------------------------------------------------------
1696	// UnionInstType
1697	template< typename pass_t >
1698	const ast::Type * ast::Pass< pass_t >::visit( const ast::UnionInstType * node ) {
1699	VISIT_START( node );
1700
1701	__pass::indexer::addStruct( pass, 0, node->name );
1702
1703	{
1704	guard_indexer guard { *this };
1705	maybe_accept( node, &UnionInstType::forall );
1706	maybe_accept( node, &UnionInstType::params );
1707	}
1708
1709	VISIT_END( Type, node );
1710	}
1711
1712	//--------------------------------------------------------------------------
1713	// EnumInstType
1714	template< typename pass_t >
1715	const ast::Type * ast::Pass< pass_t >::visit( const ast::EnumInstType * node ) {
1716	VISIT_START( node );
1717
1718	VISIT(
1719	maybe_accept( node, &EnumInstType::forall );
1720	maybe_accept( node, &EnumInstType::params );
1721	)
1722
1723	VISIT_END( Type, node );
1724	}
1725
1726	//--------------------------------------------------------------------------
1727	// TraitInstType
1728	template< typename pass_t >
1729	const ast::Type * ast::Pass< pass_t >::visit( const ast::TraitInstType * node ) {
1730	VISIT_START( node );
1731
1732	VISIT(
1733	maybe_accept( node, &TraitInstType::forall );
1734	maybe_accept( node, &TraitInstType::params );
1735	)
1736
1737	VISIT_END( Type, node );
1738	}
1739
1740	//--------------------------------------------------------------------------
1741	// TypeInstType
1742	template< typename pass_t >
1743	const ast::Type * ast::Pass< pass_t >::visit( const ast::TypeInstType * node ) {
1744	VISIT_START( node );
1745
1746	VISIT(
1747	maybe_accept( node, &TypeInstType::forall );
1748	maybe_accept( node, &TypeInstType::params );
1749	)
1750
1751	VISIT_END( Type, node );
1752	}
1753
1754	//--------------------------------------------------------------------------
1755	// TupleType
1756	template< typename pass_t >
1757	const ast::Type * ast::Pass< pass_t >::visit( const ast::TupleType * node ) {
1758	VISIT_START( node );
1759
1760	VISIT(
1761	maybe_accept( node, &TupleType::types );
1762	maybe_accept( node, &TupleType::members );
1763	)
1764
1765	VISIT_END( Type, node );
1766	}
1767
1768	//--------------------------------------------------------------------------
1769	// TypeofType
1770	template< typename pass_t >
1771	const ast::Type * ast::Pass< pass_t >::visit( const ast::TypeofType * node ) {
1772	VISIT_START( node );
1773
1774	VISIT(
1775	maybe_accept( node, &TypeofType::expr );
1776	)
1777
1778	VISIT_END( Type, node );
1779	}
1780
1781	//--------------------------------------------------------------------------
1782	// VarArgsType
1783	template< typename pass_t >
1784	const ast::Type * ast::Pass< pass_t >::visit( const ast::VarArgsType * node ) {
1785	VISIT_START( node );
1786
1787	VISIT_END( Type, node );
1788	}
1789
1790	//--------------------------------------------------------------------------
1791	// ZeroType
1792	template< typename pass_t >
1793	const ast::Type * ast::Pass< pass_t >::visit( const ast::ZeroType * node ) {
1794	VISIT_START( node );
1795
1796	VISIT_END( Type, node );
1797	}
1798
1799	//--------------------------------------------------------------------------
1800	// OneType
1801	template< typename pass_t >
1802	const ast::Type * ast::Pass< pass_t >::visit( const ast::OneType * node ) {
1803	VISIT_START( node );
1804
1805	VISIT_END( Type, node );
1806	}
1807
1808	//--------------------------------------------------------------------------
1809	// GlobalScopeType
1810	template< typename pass_t >
1811	const ast::Type * ast::Pass< pass_t >::visit( const ast::GlobalScopeType * node ) {
1812	VISIT_START( node );
1813
1814	VISIT_END( Type, node );
1815	}
1816
1817
1818	//--------------------------------------------------------------------------
1819	// Designation
1820	template< typename pass_t >
1821	const ast::Designation * ast::Pass< pass_t >::visit( const ast::Designation * node ) {
1822	VISIT_START( node );
1823
1824	VISIT( maybe_accept( node, &Designation::designators ); )
1825
1826	VISIT_END( Designation, node );
1827	}
1828
1829	//--------------------------------------------------------------------------
1830	// SingleInit
1831	template< typename pass_t >
1832	const ast::Init * ast::Pass< pass_t >::visit( const ast::SingleInit * node ) {
1833	VISIT_START( node );
1834
1835	VISIT(
1836	maybe_accept( node, &SingleInit::value );
1837	)
1838
1839	VISIT_END( Init, node );
1840	}
1841
1842	//--------------------------------------------------------------------------
1843	// ListInit
1844	template< typename pass_t >
1845	const ast::Init * ast::Pass< pass_t >::visit( const ast::ListInit * node ) {
1846	VISIT_START( node );
1847
1848	VISIT(
1849	maybe_accept( node, &ListInit::designations );
1850	maybe_accept( node, &ListInit::initializers );
1851	)
1852
1853	VISIT_END( Init, node );
1854	}
1855
1856	//--------------------------------------------------------------------------
1857	// ConstructorInit
1858	template< typename pass_t >
1859	const ast::Init * ast::Pass< pass_t >::visit( const ast::ConstructorInit * node ) {
1860	VISIT_START( node );
1861
1862	VISIT(
1863	maybe_accept( node, &ConstructorInit::ctor );
1864	maybe_accept( node, &ConstructorInit::dtor );
1865	maybe_accept( node, &ConstructorInit::init );
1866	)
1867
1868	VISIT_END( Init, node );
1869	}
1870
1871	//--------------------------------------------------------------------------
1872	// Attribute
1873	template< typename pass_t >
1874	const ast::Attribute * ast::Pass< pass_t >::visit( const ast::Attribute * node ) {
1875	VISIT_START( node );
1876
1877	VISIT(
1878	maybe_accept( node, &Attribute::params );
1879	)
1880
1881	VISIT_END( Attribute, node );
1882	}
1883
1884	//--------------------------------------------------------------------------
1885	// TypeSubstitution
1886	template< typename pass_t >
1887	const ast::TypeSubstitution * ast::Pass< pass_t >::visit( const ast::TypeSubstitution * node ) {
1888	VISIT_START( node );
1889
1890	VISIT(
1891	{
1892	bool mutated = false;
1893	std::unordered_map< std::string, ast::ptr< ast::Type > > new_map;
1894	for ( const auto & p : node->typeEnv ) {
1895	guard_indexer guard { *this };
1896	auto new_node = p.second->accept( *this );
1897	if (new_node != p.second) mutated = false;
1898	new_map.insert({ p.first, new_node });
1899	}
1900	if (mutated) {
1901	auto new_node = mutate( node );
1902	new_node->typeEnv.swap( new_map );
1903	node = new_node;
1904	}
1905	}
1906
1907	{
1908	bool mutated = false;
1909	std::unordered_map< std::string, ast::ptr< ast::Expr > > new_map;
1910	for ( const auto & p : node->varEnv ) {
1911	guard_indexer guard { *this };
1912	auto new_node = p.second->accept( *this );
1913	if (new_node != p.second) mutated = false;
1914	new_map.insert({ p.first, new_node });
1915	}
1916	if (mutated) {
1917	auto new_node = mutate( node );
1918	new_node->varEnv.swap( new_map );
1919	node = new_node;
1920	}
1921	}
1922	)
1923
1924	VISIT_END( TypeSubstitution, node );
1925	}
1926
1927	#undef VISIT_START
1928	#undef VISIT
1929	#undef VISIT_END

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