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source: src/AST/Convert.cpp @ e50d9cb8

ADTast-experimental

Last change on this file since e50d9cb8 was e874605, checked in by JiadaL <j82liang@…>, 2 years ago
Add class InlineValueDecl?, which is a Declaration class that works as a placeholder for aggregration value inherited from other aggregration. Disable inline value overwrite.
Property mode set to `100644`
File size: 82.9 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	// Convert.cpp -- Convert between the new and old syntax trees.
8	//
9	// Author : Thierry Delisle
10	// Created On : Thu May 09 15::37::05 2019
11	// Last Modified By : Andrew Beach
12	// Last Modified On : Wed Apr 20 13:58:00 2022
13	// Update Count : 43
14	//
15
16	#include "Convert.hpp"
17
18	#include <deque>
19	#include <unordered_map>
20
21	#include "AST/Attribute.hpp"
22	#include "AST/Copy.hpp"
23	#include "AST/Decl.hpp"
24	#include "AST/Expr.hpp"
25	#include "AST/Init.hpp"
26	#include "AST/Stmt.hpp"
27	#include "AST/TranslationUnit.hpp"
28	#include "AST/TypeSubstitution.hpp"
29
30	#include "SymTab/Autogen.h"
31	#include "SynTree/Attribute.h"
32	#include "SynTree/Declaration.h"
33	#include "SynTree/TypeSubstitution.h"
34
35	#include "Validate/FindSpecialDecls.h"
36
37	//================================================================================================
38	// Utilities
39	template<template <class...> class C>
40	struct to {
41	template<typename T>
42	static auto from( T && v ) -> C< typename T::value_type > {
43	C< typename T::value_type > l;
44	std::move(std::begin(v), std::end(v), std::back_inserter(l));
45	return l;
46	}
47	};
48
49	//================================================================================================
50	namespace ast {
51	// These are the shared local information used by ConverterNewToOld and
52	// ConverterOldToNew to update the global information in the two versions.
53
54	static ast::ptr<ast::Type> sizeType = nullptr;
55	static const ast::FunctionDecl * dereferenceOperator = nullptr;
56	static const ast::StructDecl * dtorStruct = nullptr;
57	static const ast::FunctionDecl * dtorStructDestroy = nullptr;
58
59	}
60
61	//================================================================================================
62	class ConverterNewToOld : public ast::Visitor {
63	BaseSyntaxNode * node = nullptr;
64	using Cache = std::unordered_map< const ast::Node , BaseSyntaxNode >;
65	Cache cache;
66
67	// Statements can no longer be shared.
68	// however, since StmtExprResult is now implemented, need to still maintain
69	// readonly references.
70	Cache readonlyCache;
71
72	template<typename T>
73	struct Getter {
74	ConverterNewToOld & visitor;
75
76	template<typename U, enum ast::Node::ref_type R>
77	T * accept1( const ast::ptr_base<U, R> & ptr ) {
78	if ( ! ptr ) return nullptr;
79	ptr->accept( visitor );
80	T * ret = strict_dynamic_cast< T * >( visitor.node );
81	visitor.node = nullptr;
82	return ret;
83	}
84
85	template<typename U>
86	std::list< T * > acceptL( const U & container ) {
87	std::list< T * > ret;
88	for ( auto ptr : container ) {
89	ret.emplace_back( accept1( ptr ) );
90	}
91	return ret;
92	}
93	};
94
95	template<typename T>
96	Getter<T> get() {
97	return Getter<T>{ *this };
98	}
99
100	Label makeLabel(Statement * labelled, const ast::Label& label) {
101	// This probably will leak memory, but only until we get rid of the old tree.
102	if ( nullptr == labelled && label.location.isSet() ) {
103	labelled = new NullStmt();
104	labelled->location = label.location;
105	}
106	return Label(
107	label.name,
108	labelled,
109	get<Attribute>().acceptL(label.attributes)
110	);
111	}
112
113	template<template <class...> class C>
114	std::list<Label> makeLabelL(Statement * labelled, const C<ast::Label>& labels) {
115	std::list<Label> ret;
116	for (auto label : labels) {
117	ret.push_back( makeLabel(labelled, label) );
118	}
119	return ret;
120	}
121
122	/// get new qualifiers from old type
123	Type::Qualifiers cv( const ast::Type * ty ) { return { ty->qualifiers.val }; }
124
125	/// returns true and sets `node` if in cache
126	bool inCache( const ast::Node * node ) {
127	auto it = cache.find( node );
128	if ( it == cache.end() ) return false;
129	this->node = it->second;
130	return true;
131	}
132
133	public:
134	Declaration * decl( const ast::Decl * declNode ) {
135	return get<Declaration>().accept1( ast::ptr<ast::Decl>( declNode ) );
136	}
137
138	private:
139	void declPostamble( Declaration * decl, const ast::Decl * node ) {
140	decl->location = node->location;
141	// name comes from constructor
142	// linkage comes from constructor
143	decl->extension = node->extension;
144	decl->uniqueId = node->uniqueId;
145	// storageClasses comes from constructor
146	this->node = decl;
147	}
148
149	const ast::DeclWithType * declWithTypePostamble (
150	DeclarationWithType * decl, const ast::DeclWithType * node ) {
151	cache.emplace( node, decl );
152	decl->mangleName = node->mangleName;
153	decl->scopeLevel = node->scopeLevel;
154	decl->asmName = get<Expression>().accept1( node->asmName );
155	// attributes comes from constructor
156	decl->isDeleted = node->isDeleted;
157	// fs comes from constructor
158	declPostamble( decl, node );
159	return nullptr;
160	}
161
162	const ast::DeclWithType * visit( const ast::ObjectDecl * node ) override final {
163	if ( inCache( node ) ) {
164	return nullptr;
165	}
166	auto bfwd = get<Expression>().accept1( node->bitfieldWidth );
167	auto type = get<Type>().accept1( node->type );
168	auto attr = get<Attribute>().acceptL( node->attributes );
169
170	// This field can be unset very early on (Pre-FixReturnTypes).
171	auto newType = (type) ? type->clone() : nullptr;
172
173	auto decl = new ObjectDecl(
174	node->name,
175	Type::StorageClasses( node->storage.val ),
176	LinkageSpec::Spec( node->linkage.val ),
177	bfwd,
178	newType,
179	nullptr, // prevent infinite loop
180	attr,
181	Type::FuncSpecifiers( node->funcSpec.val )
182	);
183
184	// handles the case where node->init references itself
185	// xxx - does it really happen?
186	declWithTypePostamble(decl, node);
187	auto init = get<Initializer>().accept1( node->init );
188	decl->init = init;
189
190	this->node = decl;
191	return nullptr;
192	}
193
194	const ast::DeclWithType * visit( const ast::FunctionDecl * node ) override final {
195	if ( inCache( node ) ) return nullptr;
196
197	// function decl contains real variables that the type must use.
198	// the structural change means function type in and out of decl
199	// must be handled differently on convert back to old.
200	auto ftype = new FunctionType(
201	cv(node->type),
202	(bool)node->type->isVarArgs
203	);
204	ftype->returnVals = get<DeclarationWithType>().acceptL(node->returns);
205	ftype->parameters = get<DeclarationWithType>().acceptL(node->params);
206
207	ftype->forall = get<TypeDecl>().acceptL( node->type_params );
208	if (!node->assertions.empty()) {
209	assert(!ftype->forall.empty());
210	// find somewhere to place assertions back, for convenience it is the last slot
211	ftype->forall.back()->assertions = get<DeclarationWithType>().acceptL(node->assertions);
212	}
213
214	visitType(node->type, ftype);
215
216	auto decl = new FunctionDecl(
217	node->name,
218	Type::StorageClasses( node->storage.val ),
219	LinkageSpec::Spec( node->linkage.val ),
220	ftype,
221	//get<FunctionType>().accept1( node->type ),
222	{},
223	get<Attribute>().acceptL( node->attributes ),
224	Type::FuncSpecifiers( node->funcSpec.val )
225	);
226	cache.emplace( node, decl );
227	decl->statements = get<CompoundStmt>().accept1( node->stmts );
228	decl->withExprs = get<Expression>().acceptL( node->withExprs );
229	if ( ast::dereferenceOperator == node ) {
230	Validate::dereferenceOperator = decl;
231	}
232	if ( ast::dtorStructDestroy == node ) {
233	Validate::dtorStructDestroy = decl;
234	}
235	return declWithTypePostamble( decl, node );
236	}
237
238	// InlineValueDecl vanish after EnumAndPointerDecay pass so no necessary to implement NewToOld
239	const ast::DeclWithType * visit( const ast::InlineValueDecl * node ) override final {
240	assert( false );
241	(void) node;
242	return nullptr;
243	}
244
245	const ast::Decl * namedTypePostamble( NamedTypeDecl * decl, const ast::NamedTypeDecl * node ) {
246	// base comes from constructor
247	decl->assertions = get<DeclarationWithType>().acceptL( node->assertions );
248	declPostamble( decl, node );
249	return nullptr;
250	}
251
252	const ast::Decl * visit( const ast::TypeDecl * node ) override final {
253	if ( inCache( node ) ) return nullptr;
254	auto decl = new TypeDecl(
255	node->name,
256	Type::StorageClasses( node->storage.val ),
257	get<Type>().accept1( node->base ),
258	(TypeDecl::Kind)(unsigned)node->kind,
259	node->sized,
260	get<Type>().accept1( node->init )
261	);
262	cache.emplace( node, decl );
263	return namedTypePostamble( decl, node );
264	}
265
266	const ast::Decl * visit( const ast::TypedefDecl * node ) override final {
267	auto decl = new TypedefDecl(
268	node->name,
269	node->location,
270	Type::StorageClasses( node->storage.val ),
271	get<Type>().accept1( node->base ),
272	LinkageSpec::Spec( node->linkage.val )
273	);
274	return namedTypePostamble( decl, node );
275	}
276
277	const ast::Decl * aggregatePostamble( AggregateDecl * decl, const ast::AggregateDecl * node ) {
278	cache.emplace( node, decl );
279	decl->members = get<Declaration>().acceptL( node->members );
280	decl->parameters = get<TypeDecl>().acceptL( node->params );
281	decl->body = node->body;
282	// attributes come from constructor
283	decl->parent = get<AggregateDecl>().accept1( node->parent );
284	declPostamble( decl, node );
285	return nullptr; // ??
286	}
287
288	const ast::Decl * visit( const ast::StructDecl * node ) override final {
289	if ( inCache( node ) ) return nullptr;
290	auto decl = new StructDecl(
291	node->name,
292	(AggregateDecl::Aggregate)node->kind,
293	get<Attribute>().acceptL( node->attributes ),
294	LinkageSpec::Spec( node->linkage.val )
295	);
296
297	if ( ast::dtorStruct == node ) {
298	Validate::dtorStruct = decl;
299	}
300
301	return aggregatePostamble( decl, node );
302	}
303
304	const ast::Decl * visit( const ast::UnionDecl * node ) override final {
305	if ( inCache( node ) ) return nullptr;
306	auto decl = new UnionDecl(
307	node->name,
308	get<Attribute>().acceptL( node->attributes ),
309	LinkageSpec::Spec( node->linkage.val )
310	);
311	return aggregatePostamble( decl, node );
312	}
313
314	const ast::Decl * visit( const ast::EnumDecl * node ) override final {
315	if ( inCache( node ) ) return nullptr;
316	auto decl = new EnumDecl(
317	node->name,
318	get<Attribute>().acceptL( node->attributes ),
319	node->isTyped,
320	LinkageSpec::Spec( node->linkage.val ),
321	get<Type>().accept1(node->base)
322	);
323	return aggregatePostamble( decl, node );
324	}
325
326	const ast::Decl * visit( const ast::TraitDecl * node ) override final {
327	if ( inCache( node ) ) return nullptr;
328	auto decl = new TraitDecl(
329	node->name,
330	{},
331	LinkageSpec::Spec( node->linkage.val )
332	);
333	return aggregatePostamble( decl, node );
334	}
335
336	const ast::AsmDecl * visit( const ast::AsmDecl * node ) override final {
337	auto decl = new AsmDecl( get<AsmStmt>().accept1( node->stmt ) );
338	declPostamble( decl, node );
339	return nullptr;
340	}
341
342	const ast::DirectiveDecl * visit( const ast::DirectiveDecl * node ) override final {
343	auto decl = new DirectiveDecl( get<DirectiveStmt>().accept1( node->stmt ) );
344	declPostamble( decl, node );
345	return nullptr;
346	}
347
348	const ast::StaticAssertDecl * visit( const ast::StaticAssertDecl * node ) override final {
349	auto decl = new StaticAssertDecl(
350	get<Expression>().accept1( node->cond ),
351	get<ConstantExpr>().accept1( node->msg )
352	);
353	declPostamble( decl, node );
354	return nullptr;
355	}
356
357	const ast::Stmt * stmtPostamble( Statement * stmt, const ast::Stmt * node ) {
358	// force statements in old tree to be unique.
359	// cache.emplace( node, stmt );
360	readonlyCache.emplace( node, stmt );
361	stmt->location = node->location;
362	stmt->labels = makeLabelL( stmt, node->labels );
363	this->node = stmt;
364	return nullptr;
365	}
366
367	void clausePostamble( Statement * stmt, const ast::StmtClause * node ) {
368	stmt->location = node->location;
369	this->node = stmt;
370	}
371
372	const ast::CompoundStmt * visit( const ast::CompoundStmt * node ) override final {
373	if ( inCache( node ) ) return nullptr;
374	auto stmt = new CompoundStmt( get<Statement>().acceptL( node->kids ) );
375	stmtPostamble( stmt, node );
376	return nullptr;
377	}
378
379	const ast::Stmt * visit( const ast::ExprStmt * node ) override final {
380	if ( inCache( node ) ) return nullptr;
381	auto stmt = new ExprStmt( nullptr );
382	stmt->expr = get<Expression>().accept1( node->expr );
383	return stmtPostamble( stmt, node );
384	}
385
386	const ast::Stmt * visit( const ast::AsmStmt * node ) override final {
387	if ( inCache( node ) ) return nullptr;
388	auto stmt = new AsmStmt(
389	node->isVolatile,
390	get<Expression>().accept1( node->instruction ),
391	get<Expression>().acceptL( node->output ),
392	get<Expression>().acceptL( node->input ),
393	get<ConstantExpr>().acceptL( node->clobber ),
394	makeLabelL( nullptr, node->gotoLabels ) // What are these labelling?
395	);
396	return stmtPostamble( stmt, node );
397	}
398
399	const ast::Stmt * visit( const ast::DirectiveStmt * node ) override final {
400	if ( inCache( node ) ) return nullptr;
401	auto stmt = new DirectiveStmt( node->directive );
402	return stmtPostamble( stmt, node );
403	}
404
405	const ast::Stmt * visit( const ast::IfStmt * node ) override final {
406	if ( inCache( node ) ) return nullptr;
407	auto stmt = new IfStmt(
408	get<Expression>().accept1( node->cond ),
409	get<Statement>().accept1( node->then ),
410	get<Statement>().accept1( node->else_ ),
411	get<Statement>().acceptL( node->inits )
412	);
413	return stmtPostamble( stmt, node );
414	}
415
416	const ast::Stmt * visit( const ast::SwitchStmt * node ) override final {
417	if ( inCache( node ) ) return nullptr;
418	auto stmt = new SwitchStmt(
419	get<Expression>().accept1( node->cond ),
420	get<Statement>().acceptL( node->cases )
421	);
422	return stmtPostamble( stmt, node );
423	}
424
425	const ast::CaseClause * visit( const ast::CaseClause * node ) override final {
426	if ( inCache( node ) ) return nullptr;
427	auto stmt = new CaseStmt(
428	get<Expression>().accept1( node->cond ),
429	get<Statement>().acceptL( node->stmts ),
430	node->isDefault()
431	);
432	clausePostamble( stmt, node );
433	return nullptr;
434	}
435
436	const ast::Stmt * visit( const ast::WhileDoStmt * node ) override final {
437	if ( inCache( node ) ) return nullptr;
438	auto inits = get<Statement>().acceptL( node->inits );
439	auto stmt = new WhileDoStmt(
440	get<Expression>().accept1( node->cond ),
441	get<Statement>().accept1( node->body ),
442	get<Statement>().accept1( node->else_ ),
443	inits,
444	node->isDoWhile
445	);
446	return stmtPostamble( stmt, node );
447	}
448
449	const ast::Stmt * visit( const ast::ForStmt * node ) override final {
450	if ( inCache( node ) ) return nullptr;
451	auto stmt = new ForStmt(
452	get<Statement>().acceptL( node->inits ),
453	get<Expression>().accept1( node->cond ),
454	get<Expression>().accept1( node->inc ),
455	get<Statement>().accept1( node->body ),
456	get<Statement>().accept1( node->else_ )
457	);
458	return stmtPostamble( stmt, node );
459	}
460
461	const ast::Stmt * visit( const ast::BranchStmt * node ) override final {
462	if ( inCache( node ) ) return nullptr;
463	BranchStmt * stmt;
464	if (node->computedTarget) {
465	stmt = new BranchStmt( get<Expression>().accept1( node->computedTarget ),
466	BranchStmt::Goto );
467	} else {
468	BranchStmt::Type type;
469	switch (node->kind) {
470	#define CASE(n) \
471	case ast::BranchStmt::n: \
472	type = BranchStmt::n; \
473	break
474	CASE(Goto);
475	CASE(Break);
476	CASE(Continue);
477	CASE(FallThrough);
478	CASE(FallThroughDefault);
479	#undef CASE
480	default:
481	assertf(false, "Invalid ast::BranchStmt::Kind: %d\n", node->kind);
482	}
483
484	// The labels here are also weird.
485	stmt = new BranchStmt( makeLabel( nullptr, node->originalTarget ), type );
486	stmt->target = makeLabel( stmt, node->target );
487	}
488	return stmtPostamble( stmt, node );
489	}
490
491	const ast::Stmt * visit( const ast::ReturnStmt * node ) override final {
492	if ( inCache( node ) ) return nullptr;
493	auto stmt = new ReturnStmt( get<Expression>().accept1( node->expr ) );
494	return stmtPostamble( stmt, node );
495	}
496
497	const ast::Stmt * visit( const ast::ThrowStmt * node ) override final {
498	if ( inCache( node ) ) return nullptr;
499	ThrowStmt::Kind kind;
500	switch (node->kind) {
501	case ast::ExceptionKind::Terminate:
502	kind = ThrowStmt::Terminate;
503	break;
504	case ast::ExceptionKind::Resume:
505	kind = ThrowStmt::Resume;
506	break;
507	default:
508	assertf(false, "Invalid ast::ThrowStmt::Kind: %d\n", node->kind);
509	}
510	auto stmt = new ThrowStmt(
511	kind,
512	get<Expression>().accept1( node->expr ),
513	get<Expression>().accept1( node->target )
514	);
515	return stmtPostamble( stmt, node );
516	}
517
518	const ast::Stmt * visit( const ast::TryStmt * node ) override final {
519	if ( inCache( node ) ) return nullptr;
520	auto handlers = get<CatchStmt>().acceptL( node->handlers );
521	auto stmt = new TryStmt(
522	get<CompoundStmt>().accept1( node->body ),
523	handlers,
524	get<FinallyStmt>().accept1( node->finally )
525	);
526	return stmtPostamble( stmt, node );
527	}
528
529	const ast::CatchClause * visit( const ast::CatchClause * node ) override final {
530	if ( inCache( node ) ) return nullptr;
531	CatchStmt::Kind kind;
532	switch (node->kind) {
533	case ast::ExceptionKind::Terminate:
534	kind = CatchStmt::Terminate;
535	break;
536	case ast::ExceptionKind::Resume:
537	kind = CatchStmt::Resume;
538	break;
539	default:
540	assertf(false, "Invalid ast::ExceptionKind: %d\n", node->kind);
541	}
542	auto stmt = new CatchStmt(
543	kind,
544	get<Declaration>().accept1( node->decl ),
545	get<Expression>().accept1( node->cond ),
546	get<Statement>().accept1( node->body )
547	);
548	return clausePostamble( stmt, node ), nullptr;
549	}
550
551	const ast::FinallyClause * visit( const ast::FinallyClause * node ) override final {
552	if ( inCache( node ) ) return nullptr;
553	auto stmt = new FinallyStmt( get<CompoundStmt>().accept1( node->body ) );
554	return clausePostamble( stmt, node ), nullptr;
555	}
556
557	const ast::Stmt * visit(const ast::SuspendStmt * node ) override final {
558	if ( inCache( node ) ) return nullptr;
559	auto stmt = new SuspendStmt();
560	stmt->then = get<CompoundStmt>().accept1( node->then );
561	switch(node->type) {
562	case ast::SuspendStmt::None : stmt->type = SuspendStmt::None ; break;
563	case ast::SuspendStmt::Coroutine: stmt->type = SuspendStmt::Coroutine; break;
564	case ast::SuspendStmt::Generator: stmt->type = SuspendStmt::Generator; break;
565	}
566	return stmtPostamble( stmt, node );
567	}
568
569	const ast::Stmt * visit( const ast::WaitForStmt * node ) override final {
570	if ( inCache( node ) ) return nullptr;
571	auto stmt = new WaitForStmt;
572	stmt->clauses.reserve( node->clauses.size() );
573	for ( auto clause : node->clauses ) {
574	stmt->clauses.push_back({{
575	get<Expression>().accept1( clause->target_func ),
576	get<Expression>().acceptL( clause->target_args ),
577	},
578	get<Statement>().accept1( clause->stmt ),
579	get<Expression>().accept1( clause->cond ),
580	});
581	}
582	stmt->timeout = {
583	get<Expression>().accept1( node->timeout_time ),
584	get<Statement>().accept1( node->timeout_stmt ),
585	get<Expression>().accept1( node->timeout_cond ),
586	};
587	stmt->orelse = {
588	get<Statement>().accept1( node->else_stmt ),
589	get<Expression>().accept1( node->else_cond ),
590	};
591	return stmtPostamble( stmt, node );
592	}
593
594	const ast::WaitForClause * visit( const ast::WaitForClause * node ) override final {
595	// There is no old-AST WaitForClause, so this should never be called.
596	assert( !node );
597	return nullptr;
598	}
599
600	const ast::Decl * visit( const ast::WithStmt * node ) override final {
601	if ( inCache( node ) ) return nullptr;
602	auto stmt = new WithStmt(
603	get<Expression>().acceptL( node->exprs ),
604	get<Statement>().accept1( node->stmt )
605	);
606	declPostamble( stmt, node );
607	return nullptr;
608	}
609
610	const ast::NullStmt * visit( const ast::NullStmt * node ) override final {
611	if ( inCache( node ) ) return nullptr;
612	auto stmt = new NullStmt();
613	stmtPostamble( stmt, node );
614	return nullptr;
615	}
616
617	const ast::Stmt * visit( const ast::DeclStmt * node ) override final {
618	if ( inCache( node ) ) return nullptr;
619	auto stmt = new DeclStmt( get<Declaration>().accept1( node->decl ) );
620	return stmtPostamble( stmt, node );
621	}
622
623	const ast::Stmt * visit( const ast::ImplicitCtorDtorStmt * node ) override final {
624	if ( inCache( node ) ) return nullptr;
625	auto stmt = new ImplicitCtorDtorStmt{
626	get<Statement>().accept1( node->callStmt )
627	};
628	return stmtPostamble( stmt, node );
629	}
630
631	const ast::Stmt * visit( const ast::MutexStmt * node ) override final {
632	if ( inCache( node ) ) return nullptr;
633	auto stmt = new MutexStmt(
634	get<Statement>().accept1( node->stmt ),
635	get<Expression>().acceptL( node->mutexObjs )
636	);
637	return stmtPostamble( stmt, node );
638	}
639
640	TypeSubstitution * convertTypeSubstitution(const ast::TypeSubstitution * src) {
641
642	if (!src) return nullptr;
643
644	TypeSubstitution *rslt = new TypeSubstitution();
645
646	for (decltype(src->begin()) src_i = src->begin(); src_i != src->end(); src_i++) {
647	rslt->add( src_i->first.typeString(),
648	get<Type>().accept1(src_i->second) );
649	}
650
651	return rslt;
652	}
653
654	void convertInferUnion(std::map<UniqueId,ParamEntry> &tgtInferParams,
655	std::vector<UniqueId> &tgtResnSlots,
656	const ast::Expr::InferUnion &srcInferred ) {
657
658	assert( tgtInferParams.empty() );
659	assert( tgtResnSlots.empty() );
660
661	if ( srcInferred.data.inferParams ) {
662	const ast::InferredParams &srcParams = srcInferred.inferParams();
663	for (auto & srcParam : srcParams) {
664	auto res = tgtInferParams.emplace(srcParam.first, ParamEntry(
665	srcParam.second.decl,
666	get<Declaration>().accept1(srcParam.second.declptr),
667	get<Type>().accept1(srcParam.second.actualType)->clone(),
668	get<Type>().accept1(srcParam.second.formalType)->clone(),
669	get<Expression>().accept1(srcParam.second.expr)->clone()
670	));
671	assert(res.second);
672	}
673	}
674	if ( srcInferred.data.resnSlots ) {
675	const ast::ResnSlots &srcSlots = srcInferred.resnSlots();
676	for (auto srcSlot : srcSlots) {
677	tgtResnSlots.push_back(srcSlot);
678	}
679	}
680	}
681
682	Expression * visitBaseExpr_skipResultType(const ast::Expr * src, Expression * tgt) {
683
684	tgt->location = src->location;
685	tgt->env = convertTypeSubstitution(src->env);
686	tgt->extension = src->extension;
687
688	convertInferUnion(tgt->inferParams, tgt->resnSlots, src->inferred);
689	return tgt;
690	}
691
692	Expression * visitBaseExpr(const ast::Expr * src, Expression * tgt) {
693
694	tgt->result = get<Type>().accept1(src->result);
695	// Unconditionally use a clone of the result type.
696	// We know this will leak some objects: much of the immediate conversion result.
697	// In some cases, using the conversion result directly gives unintended object sharing.
698	// A parameter (ObjectDecl, a child of a FunctionType) is shared by the weak-ref cache.
699	// But tgt->result must be fully owned privately by tgt.
700	// Applying these conservative copies here means
701	// - weak references point at the declaration's copy, not these expr.result copies (good)
702	// - we copy more objects than really needed (bad, tolerated)
703	if (tgt->result) {
704	tgt->result = tgt->result->clone();
705	}
706	return visitBaseExpr_skipResultType(src, tgt);
707	}
708
709	const ast::Expr * visit( const ast::ApplicationExpr * node ) override final {
710	auto expr = visitBaseExpr( node,
711	new ApplicationExpr(
712	get<Expression>().accept1(node->func),
713	get<Expression>().acceptL(node->args)
714	)
715	);
716	this->node = expr;
717	return nullptr;
718	}
719
720	const ast::Expr * visit( const ast::UntypedExpr * node ) override final {
721	auto expr = visitBaseExpr( node,
722	new UntypedExpr(
723	get<Expression>().accept1(node->func),
724	get<Expression>().acceptL(node->args)
725	)
726	);
727	this->node = expr;
728	return nullptr;
729	}
730
731	const ast::Expr * visit( const ast::NameExpr * node ) override final {
732	auto expr = visitBaseExpr( node,
733	new NameExpr(
734	node->name
735	)
736	);
737	this->node = expr;
738	return nullptr;
739	}
740
741	const ast::Expr * visit( const ast::QualifiedNameExpr * node ) override final {
742	auto temp = new QualifiedNameExpr(
743	get<Declaration>().accept1(node->type_decl),
744	node->name
745	);
746	auto expr = visitBaseExpr( node,
747	temp
748	);
749	this->node = expr;
750	return nullptr;
751	}
752
753	const ast::Expr * visit( const ast::AddressExpr * node ) override final {
754	auto expr = visitBaseExpr( node,
755	new AddressExpr(
756	get<Expression>().accept1(node->arg)
757	)
758	);
759	this->node = expr;
760	return nullptr;
761	}
762
763	const ast::Expr * visit( const ast::LabelAddressExpr * node ) override final {
764	auto expr = visitBaseExpr( node,
765	new LabelAddressExpr(
766	makeLabel(nullptr, node->arg)
767	)
768	);
769	this->node = expr;
770	return nullptr;
771	}
772
773	const ast::Expr * visit( const ast::CastExpr * node ) override final {
774	auto expr = visitBaseExpr( node,
775	new CastExpr(
776	get<Expression>().accept1(node->arg),
777	(node->isGenerated == ast::GeneratedCast)
778	)
779	);
780	this->node = expr;
781	return nullptr;
782	}
783
784	const ast::Expr * visit( const ast::KeywordCastExpr * node ) override final {
785	AggregateDecl::Aggregate castTarget = (AggregateDecl::Aggregate)node->target;
786	assert( AggregateDecl::Generator <= castTarget && castTarget <= AggregateDecl::Thread );
787	auto expr = visitBaseExpr( node,
788	new KeywordCastExpr(
789	get<Expression>().accept1(node->arg),
790	castTarget,
791	{node->concrete_target.field, node->concrete_target.getter}
792	)
793	);
794	this->node = expr;
795	return nullptr;
796	}
797
798	const ast::Expr * visit( const ast::VirtualCastExpr * node ) override final {
799	auto expr = visitBaseExpr_skipResultType( node,
800	new VirtualCastExpr(
801	get<Expression>().accept1(node->arg),
802	get<Type>().accept1(node->result)
803	)
804	);
805	this->node = expr;
806	return nullptr;
807	}
808
809	const ast::Expr * visit( const ast::UntypedMemberExpr * node ) override final {
810	auto expr = visitBaseExpr( node,
811	new UntypedMemberExpr(
812	get<Expression>().accept1(node->member),
813	get<Expression>().accept1(node->aggregate)
814	)
815	);
816	this->node = expr;
817	return nullptr;
818	}
819
820	const ast::Expr * visit( const ast::MemberExpr * node ) override final {
821	auto expr = visitBaseExpr( node,
822	new MemberExpr(
823	get<DeclarationWithType>().accept1(node->member),
824	get<Expression>().accept1(node->aggregate)
825	)
826	);
827	this->node = expr;
828	return nullptr;
829	}
830
831	const ast::Expr * visit( const ast::VariableExpr * node ) override final {
832	auto expr = new VariableExpr();
833	expr->var = get<DeclarationWithType>().accept1(node->var);
834	visitBaseExpr( node, expr );
835	this->node = expr;
836	return nullptr;
837	}
838
839	const ast::Expr * visit( const ast::ConstantExpr * node ) override final {
840	// Old world: two types: rslt->constant.type, rslt->result
841	// New workd: one public type: node->result, plus node->underlyer only to support roundtrip conversion
842	// preserving underlyer because the correct type for string literals is complicated to construct,
843	// and distinguishing a string from other literals using the type is hard to do accurately
844	// Both worlds: the outer, expression-level type can change during resolution
845	// for a string, that's char[k] before-resolve and char * after
846	// Old world: the inner Constant type stays what it was built with
847	// for a string, that's char[k] always
848	// Both worlds: the "rep" field of a constant is the C source file fragment that compiles to the desired value
849	// for a string, that includes outer quotes, backslashes, et al cases from the Literals test
850	ConstantExpr *rslt = new ConstantExpr(Constant(
851	get<Type>().accept1(node->underlyer),
852	node->rep,
853	node->ival));
854	auto expr = visitBaseExpr( node, rslt );
855	this->node = expr;
856	return nullptr;
857	}
858
859	const ast::Expr * visit( const ast::SizeofExpr * node ) override final {
860	assert (node->expr \|\| node->type);
861	assert (! (node->expr && node->type));
862	SizeofExpr *rslt;
863	if (node->expr) {
864	rslt = new SizeofExpr(
865	get<Expression>().accept1(node->expr)
866	);
867	assert (!rslt->isType);
868	}
869	else {
870	assert(node->type);
871	rslt = new SizeofExpr(
872	get<Type>().accept1(node->type)
873	);
874	assert (rslt->isType);
875	}
876	auto expr = visitBaseExpr( node, rslt );
877	this->node = expr;
878	return nullptr;
879	}
880
881	const ast::Expr * visit( const ast::AlignofExpr * node ) override final {
882	assert (node->expr \|\| node->type);
883	assert (! (node->expr && node->type));
884	AlignofExpr *rslt;
885	if (node->expr) {
886	rslt = new AlignofExpr(
887	get<Expression>().accept1(node->expr)
888	);
889	assert (!rslt->isType);
890	}
891	else {
892	assert(node->type);
893	rslt = new AlignofExpr(
894	get<Type>().accept1(node->type)
895	);
896	assert (rslt->isType);
897	}
898	auto expr = visitBaseExpr( node, rslt );
899	this->node = expr;
900	return nullptr;
901	}
902
903	const ast::Expr * visit( const ast::UntypedOffsetofExpr * node ) override final {
904	auto expr = visitBaseExpr( node,
905	new UntypedOffsetofExpr(
906	get<Type>().accept1(node->type),
907	node->member
908	)
909	);
910	this->node = expr;
911	return nullptr;
912	}
913
914	const ast::Expr * visit( const ast::OffsetofExpr * node ) override final {
915	auto expr = visitBaseExpr( node,
916	new OffsetofExpr(
917	get<Type>().accept1(node->type),
918	get<DeclarationWithType>().accept1(node->member)
919	)
920	);
921	this->node = expr;
922	return nullptr;
923	}
924
925	const ast::Expr * visit( const ast::OffsetPackExpr * node ) override final {
926	auto expr = visitBaseExpr( node,
927	new OffsetPackExpr(
928	get<StructInstType>().accept1(node->type)
929	)
930	);
931	this->node = expr;
932	return nullptr;
933	}
934
935	const ast::Expr * visit( const ast::LogicalExpr * node ) override final {
936	assert (node->isAnd == ast::LogicalFlag::AndExpr \|\|
937	node->isAnd == ast::LogicalFlag::OrExpr );
938	auto expr = visitBaseExpr( node,
939	new LogicalExpr(
940	get<Expression>().accept1(node->arg1),
941	get<Expression>().accept1(node->arg2),
942	(node->isAnd == ast::LogicalFlag::AndExpr)
943	)
944	);
945	this->node = expr;
946	return nullptr;
947	}
948
949	const ast::Expr * visit( const ast::ConditionalExpr * node ) override final {
950	auto expr = visitBaseExpr( node,
951	new ConditionalExpr(
952	get<Expression>().accept1(node->arg1),
953	get<Expression>().accept1(node->arg2),
954	get<Expression>().accept1(node->arg3)
955	)
956	);
957	this->node = expr;
958	return nullptr;
959	}
960
961	const ast::Expr * visit( const ast::CommaExpr * node ) override final {
962	auto expr = visitBaseExpr( node,
963	new CommaExpr(
964	get<Expression>().accept1(node->arg1),
965	get<Expression>().accept1(node->arg2)
966	)
967	);
968	this->node = expr;
969	return nullptr;
970	}
971
972	const ast::Expr * visit( const ast::TypeExpr * node ) override final {
973	auto expr = visitBaseExpr( node,
974	new TypeExpr(
975	get<Type>().accept1(node->type)
976	)
977	);
978	this->node = expr;
979	return nullptr;
980	}
981
982	const ast::Expr * visit( const ast::DimensionExpr * node ) override final {
983	auto expr = visitBaseExpr( node, new DimensionExpr( node->name ) );
984	this->node = expr;
985	return nullptr;
986	}
987
988	const ast::Expr * visit( const ast::AsmExpr * node ) override final {
989	auto expr = visitBaseExpr( node,
990	new AsmExpr(
991	new std::string(node->inout),
992	get<Expression>().accept1(node->constraint),
993	get<Expression>().accept1(node->operand)
994	)
995	);
996	this->node = expr;
997	return nullptr;
998	}
999
1000	const ast::Expr * visit( const ast::ImplicitCopyCtorExpr * node ) override final {
1001	auto rslt = new ImplicitCopyCtorExpr(
1002	get<ApplicationExpr>().accept1(node->callExpr)
1003	);
1004
1005	auto expr = visitBaseExpr( node, rslt );
1006	this->node = expr;
1007	return nullptr;
1008	}
1009
1010	const ast::Expr * visit( const ast::ConstructorExpr * node ) override final {
1011	auto expr = visitBaseExpr( node,
1012	new ConstructorExpr(
1013	get<Expression>().accept1(node->callExpr)
1014	)
1015	);
1016	this->node = expr;
1017	return nullptr;
1018	}
1019
1020	const ast::Expr * visit( const ast::CompoundLiteralExpr * node ) override final {
1021	auto expr = visitBaseExpr_skipResultType( node,
1022	new CompoundLiteralExpr(
1023	get<Type>().accept1(node->result),
1024	get<Initializer>().accept1(node->init)
1025	)
1026	);
1027	this->node = expr;
1028	return nullptr;
1029	}
1030
1031	const ast::Expr * visit( const ast::RangeExpr * node ) override final {
1032	auto expr = visitBaseExpr( node,
1033	new RangeExpr(
1034	get<Expression>().accept1(node->low),
1035	get<Expression>().accept1(node->high)
1036	)
1037	);
1038	this->node = expr;
1039	return nullptr;
1040	}
1041
1042	const ast::Expr * visit( const ast::UntypedTupleExpr * node ) override final {
1043	auto expr = visitBaseExpr( node,
1044	new UntypedTupleExpr(
1045	get<Expression>().acceptL(node->exprs)
1046	)
1047	);
1048	this->node = expr;
1049	return nullptr;
1050	}
1051
1052	const ast::Expr * visit( const ast::TupleExpr * node ) override final {
1053	auto expr = visitBaseExpr( node,
1054	new TupleExpr(
1055	get<Expression>().acceptL(node->exprs)
1056	)
1057	);
1058	this->node = expr;
1059	return nullptr;
1060	}
1061
1062	const ast::Expr * visit( const ast::TupleIndexExpr * node ) override final {
1063	auto expr = visitBaseExpr( node,
1064	new TupleIndexExpr(
1065	get<Expression>().accept1(node->tuple),
1066	node->index
1067	)
1068	);
1069	this->node = expr;
1070	return nullptr;
1071	}
1072
1073	const ast::Expr * visit( const ast::TupleAssignExpr * node ) override final {
1074	auto expr = visitBaseExpr( node,
1075	new TupleAssignExpr(
1076	get<StmtExpr>().accept1(node->stmtExpr)
1077	)
1078	);
1079	this->node = expr;
1080	return nullptr;
1081	}
1082
1083	const ast::Expr * visit( const ast::StmtExpr * node ) override final {
1084	auto rslt = new StmtExpr(
1085	get<CompoundStmt>().accept1(node->stmts)
1086	);
1087
1088	rslt->returnDecls = get<ObjectDecl>().acceptL(node->returnDecls);
1089	rslt->dtors = get<Expression>().acceptL(node->dtors);
1090
1091	// is this even used after convert?
1092	//if (tmp->resultExpr) {
1093	// // this MUST be found by children visit
1094	// rslt->resultExpr = strict_dynamic_cast<ExprStmt *>(readonlyCache.at(tmp->resultExpr));
1095	//}
1096
1097	auto expr = visitBaseExpr( node, rslt );
1098	this->node = expr;
1099	return nullptr;
1100	}
1101
1102	const ast::Expr * visit( const ast::UniqueExpr * node ) override final {
1103	auto rslt = new UniqueExpr(
1104	get<Expression>().accept1(node->expr),
1105	node->id
1106	);
1107
1108	rslt->object = get<ObjectDecl> ().accept1(node->object);
1109	rslt->var = get<VariableExpr>().accept1(node->var);
1110
1111	auto expr = visitBaseExpr( node, rslt );
1112	this->node = expr->clone();
1113	return nullptr;
1114	}
1115
1116	const ast::Expr * visit( const ast::UntypedInitExpr * node ) override final {
1117	std::list<InitAlternative> initAlts;
1118	for (auto ia : node->initAlts) {
1119	initAlts.push_back(InitAlternative(
1120	get<Type> ().accept1(ia.type),
1121	get<Designation>().accept1(ia.designation)
1122	));
1123	}
1124	auto expr = visitBaseExpr( node,
1125	new UntypedInitExpr(
1126	get<Expression>().accept1(node->expr),
1127	initAlts
1128	)
1129	);
1130	this->node = expr;
1131	return nullptr;
1132	}
1133
1134	const ast::Expr * visit( const ast::InitExpr * node ) override final {
1135	auto expr = visitBaseExpr( node,
1136	new InitExpr(
1137	get<Expression>().accept1(node->expr),
1138	get<Designation>().accept1(node->designation)
1139	)
1140	);
1141	this->node = expr;
1142	return nullptr;
1143	}
1144
1145	const ast::Expr * visit( const ast::DeletedExpr * node ) override final {
1146	auto expr = visitBaseExpr( node,
1147	new DeletedExpr(
1148	get<Expression>().accept1(node->expr),
1149	inCache(node->deleteStmt) ?
1150	strict_dynamic_cast<Declaration*>(this->node) :
1151	get<Declaration>().accept1(node->deleteStmt)
1152	)
1153	);
1154	this->node = expr;
1155	return nullptr;
1156	}
1157
1158	const ast::Expr * visit( const ast::DefaultArgExpr * node ) override final {
1159	auto expr = visitBaseExpr( node,
1160	new DefaultArgExpr(
1161	get<Expression>().accept1(node->expr)
1162	)
1163	);
1164	this->node = expr;
1165	return nullptr;
1166	}
1167
1168	const ast::Expr * visit( const ast::GenericExpr * node ) override final {
1169	std::list<GenericExpr::Association> associations;
1170	for (auto association : node->associations) {
1171	associations.push_back(GenericExpr::Association(
1172	get<Type> ().accept1(association.type),
1173	get<Expression>().accept1(association.expr)
1174	));
1175	}
1176	auto expr = visitBaseExpr( node,
1177	new GenericExpr(
1178	get<Expression>().accept1(node->control),
1179	associations
1180	)
1181	);
1182	this->node = expr;
1183	return nullptr;
1184	}
1185
1186	const ast::Type * visitType( const ast::Type * node, Type * type ) {
1187	// Some types do this in their constructor so add a check.
1188	if ( !node->attributes.empty() && type->attributes.empty() ) {
1189	type->attributes = get<Attribute>().acceptL( node->attributes );
1190	}
1191	this->node = type;
1192	return nullptr;
1193	}
1194
1195	const ast::Type * visit( const ast::VoidType * node ) override final {
1196	return visitType( node, new VoidType{ cv( node ) } );
1197	}
1198
1199	const ast::Type * visit( const ast::BasicType * node ) override final {
1200	auto type = new BasicType{ cv( node ), (BasicType::Kind)(unsigned)node->kind };
1201	// I believe this should always be a BasicType.
1202	if ( ast::sizeType == node ) {
1203	Validate::SizeType = type;
1204	}
1205	return visitType( node, type );
1206	}
1207
1208	const ast::Type * visit( const ast::PointerType * node ) override final {
1209	return visitType( node, new PointerType{
1210	cv( node ),
1211	get<Type>().accept1( node->base ),
1212	get<Expression>().accept1( node->dimension ),
1213	(bool)node->isVarLen,
1214	(bool)node->isStatic
1215	} );
1216	}
1217
1218	const ast::Type * visit( const ast::ArrayType * node ) override final {
1219	return visitType( node, new ArrayType{
1220	cv( node ),
1221	get<Type>().accept1( node->base ),
1222	get<Expression>().accept1( node->dimension ),
1223	(bool)node->isVarLen,
1224	(bool)node->isStatic
1225	} );
1226	}
1227
1228	const ast::Type * visit( const ast::ReferenceType * node ) override final {
1229	return visitType( node, new ReferenceType{
1230	cv( node ),
1231	get<Type>().accept1( node->base )
1232	} );
1233	}
1234
1235	const ast::Type * visit( const ast::QualifiedType * node ) override final {
1236	return visitType( node, new QualifiedType{
1237	cv( node ),
1238	get<Type>().accept1( node->parent ),
1239	get<Type>().accept1( node->child )
1240	} );
1241	}
1242
1243	const ast::Type * visit( const ast::FunctionType * node ) override final {
1244	static std::string dummy_paramvar_prefix = "__param_";
1245	static std::string dummy_returnvar_prefix = "__retval_";
1246
1247	auto ty = new FunctionType {
1248	cv( node ),
1249	(bool)node->isVarArgs
1250	};
1251	auto returns = get<Type>().acceptL(node->returns);
1252	auto params = get<Type>().acceptL(node->params);
1253
1254	int ret_index = 0;
1255	for (auto t: returns) {
1256	// xxx - LinkageSpec shouldn't matter but needs to be something
1257	ObjectDecl * dummy = new ObjectDecl(dummy_returnvar_prefix + std::to_string(ret_index++), {}, LinkageSpec::C, nullptr, t, nullptr);
1258	ty->returnVals.push_back(dummy);
1259	}
1260	int param_index = 0;
1261	for (auto t: params) {
1262	ObjectDecl * dummy = new ObjectDecl(dummy_paramvar_prefix + std::to_string(param_index++), {}, LinkageSpec::C, nullptr, t, nullptr);
1263	ty->parameters.push_back(dummy);
1264	}
1265
1266	// ty->returnVals = get<DeclarationWithType>().acceptL( node->returns );
1267	// ty->parameters = get<DeclarationWithType>().acceptL( node->params );
1268
1269	auto types = get<TypeInstType>().acceptL( node->forall );
1270	for (auto t : types) {
1271	auto newT = new TypeDecl(*t->baseType);
1272	newT->name = t->name; // converted by typeString()
1273	for (auto asst : newT->assertions) delete asst;
1274	newT->assertions.clear();
1275	ty->forall.push_back(newT);
1276	}
1277	auto assts = get<VariableExpr>().acceptL( node->assertions );
1278	if (!assts.empty()) {
1279	assert(!types.empty());
1280	for (auto asst : assts) {
1281	auto newDecl = new ObjectDecl(strict_dynamic_cast<ObjectDecl>(asst->var));
1282	delete newDecl->type;
1283	newDecl->type = asst->result->clone();
1284	newDecl->storageClasses.is_extern = true; // hack
1285	ty->forall.back()->assertions.push_back(newDecl);
1286	}
1287	}
1288
1289	return visitType( node, ty );
1290	}
1291
1292	const ast::Type * postvisit( const ast::BaseInstType * old, ReferenceToType * ty ) {
1293	ty->parameters = get<Expression>().acceptL( old->params );
1294	ty->hoistType = old->hoistType;
1295	return visitType( old, ty );
1296	}
1297
1298	const ast::Type * visit( const ast::StructInstType * node ) override final {
1299	StructInstType * ty;
1300	if ( node->base ) {
1301	ty = new StructInstType{
1302	cv( node ),
1303	get<StructDecl>().accept1( node->base ),
1304	get<Attribute>().acceptL( node->attributes )
1305	};
1306	} else {
1307	ty = new StructInstType{
1308	cv( node ),
1309	node->name,
1310	get<Attribute>().acceptL( node->attributes )
1311	};
1312	}
1313	return postvisit( node, ty );
1314	}
1315
1316	const ast::Type * visit( const ast::UnionInstType * node ) override final {
1317	UnionInstType * ty;
1318	if ( node->base ) {
1319	ty = new UnionInstType{
1320	cv( node ),
1321	get<UnionDecl>().accept1( node->base ),
1322	get<Attribute>().acceptL( node->attributes )
1323	};
1324	} else {
1325	ty = new UnionInstType{
1326	cv( node ),
1327	node->name,
1328	get<Attribute>().acceptL( node->attributes )
1329	};
1330	}
1331	return postvisit( node, ty );
1332	}
1333
1334	const ast::Type * visit( const ast::EnumInstType * node ) override final {
1335	EnumInstType * ty;
1336	if ( node->base ) {
1337	ty = new EnumInstType{
1338	cv( node ),
1339	get<EnumDecl>().accept1( node->base ),
1340	get<Attribute>().acceptL( node->attributes )
1341	};
1342	} else {
1343	ty = new EnumInstType{
1344	cv( node ),
1345	node->name,
1346	get<Attribute>().acceptL( node->attributes )
1347	};
1348	}
1349	return postvisit( node, ty );
1350	}
1351
1352	const ast::Type * visit( const ast::TraitInstType * node ) override final {
1353	TraitInstType * ty;
1354	if ( node->base ) {
1355	ty = new TraitInstType{
1356	cv( node ),
1357	get<TraitDecl>().accept1( node->base ),
1358	get<Attribute>().acceptL( node->attributes )
1359	};
1360	} else {
1361	ty = new TraitInstType{
1362	cv( node ),
1363	node->name,
1364	get<Attribute>().acceptL( node->attributes )
1365	};
1366	}
1367	return postvisit( node, ty );
1368	}
1369
1370	const ast::Type * visit( const ast::TypeInstType * node ) override final {
1371	TypeInstType * ty;
1372	if ( node->base ) {
1373	ty = new TypeInstType{
1374	cv( node ),
1375	node->typeString(),
1376	get<TypeDecl>().accept1( node->base ),
1377	get<Attribute>().acceptL( node->attributes )
1378	};
1379	} else {
1380	ty = new TypeInstType{
1381	cv( node ),
1382	node->typeString(),
1383	node->kind == ast::TypeDecl::Ftype,
1384	get<Attribute>().acceptL( node->attributes )
1385	};
1386	}
1387	return postvisit( node, ty );
1388	}
1389
1390	const ast::Type * visit( const ast::TupleType * node ) override final {
1391	return visitType( node, new TupleType{
1392	cv( node ),
1393	get<Type>().acceptL( node->types )
1394	// members generated by TupleType c'tor
1395	} );
1396	}
1397
1398	const ast::Type * visit( const ast::TypeofType * node ) override final {
1399	return visitType( node, new TypeofType{
1400	cv( node ),
1401	get<Expression>().accept1( node->expr ),
1402	(bool)node->kind
1403	} );
1404	}
1405
1406	const ast::Type * visit( const ast::VTableType * node ) override final {
1407	return visitType( node, new VTableType{
1408	cv( node ),
1409	get<Type>().accept1( node->base )
1410	} );
1411	}
1412
1413	const ast::Type * visit( const ast::VarArgsType * node ) override final {
1414	return visitType( node, new VarArgsType{ cv( node ) } );
1415	}
1416
1417	const ast::Type * visit( const ast::ZeroType * node ) override final {
1418	return visitType( node, new ZeroType{ cv( node ) } );
1419	}
1420
1421	const ast::Type * visit( const ast::OneType * node ) override final {
1422	return visitType( node, new OneType{ cv( node ) } );
1423	}
1424
1425	const ast::Type * visit( const ast::GlobalScopeType * node ) override final {
1426	return visitType( node, new GlobalScopeType{} );
1427	}
1428
1429	const ast::Designation * visit( const ast::Designation * node ) override final {
1430	auto designation = new Designation( get<Expression>().acceptL( node->designators ) );
1431	designation->location = node->location;
1432	this->node = designation;
1433	return nullptr;
1434	}
1435
1436	const ast::Init * visit( const ast::SingleInit * node ) override final {
1437	auto init = new SingleInit(
1438	get<Expression>().accept1( node->value ),
1439	ast::MaybeConstruct == node->maybeConstructed
1440	);
1441	init->location = node->location;
1442	this->node = init;
1443	return nullptr;
1444	}
1445
1446	const ast::Init * visit( const ast::ListInit * node ) override final {
1447	auto init = new ListInit(
1448	get<Initializer>().acceptL( node->initializers ),
1449	get<Designation>().acceptL( node->designations ),
1450	ast::MaybeConstruct == node->maybeConstructed
1451	);
1452	init->location = node->location;
1453	this->node = init;
1454	return nullptr;
1455	}
1456
1457	const ast::Init * visit( const ast::ConstructorInit * node ) override final {
1458	auto init = new ConstructorInit(
1459	get<Statement>().accept1( node->ctor ),
1460	get<Statement>().accept1( node->dtor ),
1461	get<Initializer>().accept1( node->init )
1462	);
1463	init->location = node->location;
1464	this->node = init;
1465	return nullptr;
1466	}
1467
1468	const ast::Attribute * visit( const ast::Attribute * node ) override final {
1469	auto attr = new Attribute(
1470	node->name,
1471	get<Expression>().acceptL(node->params)
1472	);
1473	this->node = attr;
1474	return nullptr;
1475	}
1476
1477	const ast::TypeSubstitution * visit( const ast::TypeSubstitution * node ) override final {
1478	// Handled by convertTypeSubstitution helper instead.
1479	// TypeSubstitution is not a node in the old model, so the conversion result wouldn't fit in this->node.
1480	assert( 0 );
1481	(void)node;
1482	return nullptr;
1483	}
1484	};
1485
1486	std::list< Declaration * > convert( const ast::TranslationUnit && translationUnit ) {
1487	// Copy values from the global store to the local static variables.
1488	ast::sizeType = translationUnit.global.sizeType;
1489	ast::dereferenceOperator = translationUnit.global.dereference;
1490	ast::dtorStruct = translationUnit.global.dtorStruct;
1491	ast::dtorStructDestroy = translationUnit.global.dtorDestroy;
1492
1493	ConverterNewToOld c;
1494	std::list< Declaration * > decls;
1495	for(auto d : translationUnit.decls) {
1496	decls.emplace_back( c.decl( d ) );
1497	}
1498	return decls;
1499	}
1500
1501	//================================================================================================
1502
1503	class ConverterOldToNew : public Visitor {
1504	public:
1505	ast::Decl * decl() {
1506	return strict_dynamic_cast< ast::Decl * >( node );
1507	}
1508
1509	ConverterOldToNew() = default;
1510	ConverterOldToNew(const ConverterOldToNew &) = delete;
1511	ConverterOldToNew(ConverterOldToNew &&) = delete;
1512	private:
1513	/// conversion output
1514	ast::Node * node = nullptr;
1515	/// cache of nodes that might be referenced by readonly<> for de-duplication
1516	/// in case that some nodes are dropped by conversion (due to possible structural change)
1517	/// use smart pointers in cache value to prevent accidental invalidation.
1518	/// at conversion stage, all created nodes are guaranteed to be unique, therefore
1519	/// const_casting out of smart pointers is permitted.
1520	std::unordered_map< const BaseSyntaxNode *, ast::readonly<ast::Node> > cache = {};
1521
1522	// Local Utilities:
1523
1524	template<typename NewT, typename OldT>
1525	NewT * getAccept1( OldT old ) {
1526	if ( ! old ) return nullptr;
1527	old->accept(*this);
1528	ast::Node * ret = node;
1529	node = nullptr;
1530	return strict_dynamic_cast< NewT * >( ret );
1531	}
1532
1533	# define GET_ACCEPT_1(child, type) \
1534	getAccept1< ast::type, decltype( old->child ) >( old->child )
1535
1536
1537	template<typename NewT, typename OldC>
1538	std::vector< ast::ptr<NewT> > getAcceptV( const OldC& old ) {
1539	std::vector< ast::ptr<NewT> > ret;
1540	ret.reserve( old.size() );
1541	for ( auto a : old ) {
1542	a->accept( *this );
1543	ret.emplace_back( strict_dynamic_cast< NewT * >(node) );
1544	node = nullptr;
1545	}
1546	return ret;
1547	}
1548
1549	# define GET_ACCEPT_V(child, type) \
1550	getAcceptV< ast::type, decltype( old->child ) >( old->child )
1551
1552	# define GET_ACCEPT_E(child, type) \
1553	getAccept1< ast::type, decltype( old->base ) >( old->base )
1554
1555	template<typename NewT, typename OldC>
1556	std::deque< ast::ptr<NewT> > getAcceptD( const OldC& old ) {
1557	std::deque< ast::ptr<NewT> > ret;
1558	for ( auto a : old ) {
1559	a->accept( *this );
1560	ret.emplace_back( strict_dynamic_cast< NewT * >(node) );
1561	node = nullptr;
1562	}
1563	return ret;
1564	}
1565
1566	# define GET_ACCEPT_D(child, type) \
1567	getAcceptD< ast::type, decltype( old->child ) >( old->child )
1568
1569	ast::Label make_label(const Label* old) {
1570	CodeLocation const & location =
1571	( old->labelled ) ? old->labelled->location : CodeLocation();
1572	return ast::Label(
1573	location,
1574	old->name,
1575	GET_ACCEPT_V(attributes, Attribute)
1576	);
1577	}
1578
1579	template<template <class...> class C>
1580	C<ast::Label> make_labels(C<Label> olds) {
1581	C<ast::Label> ret;
1582	for (auto oldn : olds) {
1583	ret.push_back( make_label( &oldn ) );
1584	}
1585	return ret;
1586	}
1587
1588	# define GET_LABELS_V(labels) \
1589	to<std::vector>::from( make_labels( std::move( labels ) ) )
1590
1591	static ast::CV::Qualifiers cv( const Type * ty ) { return { ty->tq.val }; }
1592
1593	/// returns true and sets `node` if in cache
1594	bool inCache( const BaseSyntaxNode * old ) {
1595	auto it = cache.find( old );
1596	if ( it == cache.end() ) return false;
1597	node = const_cast<ast::Node *>(it->second.get());
1598	return true;
1599	}
1600
1601	// Now all the visit functions:
1602
1603	virtual void visit( const ObjectDecl * old ) override final {
1604	if ( inCache( old ) ) {
1605	return;
1606	}
1607	auto&& type = GET_ACCEPT_1(type, Type);
1608	auto&& init = GET_ACCEPT_1(init, Init);
1609	auto&& bfwd = GET_ACCEPT_1(bitfieldWidth, Expr);
1610	auto&& attr = GET_ACCEPT_V(attributes, Attribute);
1611
1612	auto decl = new ast::ObjectDecl(
1613	old->location,
1614	old->name,
1615	type,
1616	init,
1617	{ old->get_storageClasses().val },
1618	{ old->linkage.val },
1619	bfwd,
1620	std::move(attr),
1621	{ old->get_funcSpec().val }
1622	);
1623	decl->enumInLine = old->enumInLine;
1624	cache.emplace(old, decl);
1625	assert(cache.find( old ) != cache.end());
1626	decl->scopeLevel = old->scopeLevel;
1627	decl->mangleName = old->mangleName;
1628	decl->isDeleted = old->isDeleted;
1629	decl->asmName = GET_ACCEPT_1(asmName, Expr);
1630	decl->uniqueId = old->uniqueId;
1631	decl->extension = old->extension;
1632
1633	this->node = decl;
1634	}
1635
1636	virtual void visit( const FunctionDecl * old ) override final {
1637	if ( inCache( old ) ) return;
1638	auto paramVars = GET_ACCEPT_V(type->parameters, DeclWithType);
1639	auto returnVars = GET_ACCEPT_V(type->returnVals, DeclWithType);
1640	auto forall = GET_ACCEPT_V(type->forall, TypeDecl);
1641
1642	// function type is now derived from parameter decls instead of storing them
1643
1644	/*
1645	auto ftype = new ast::FunctionType((ast::ArgumentFlag)old->type->isVarArgs, cv(old->type));
1646	ftype->params.reserve(paramVars.size());
1647	ftype->returns.reserve(returnVars.size());
1648
1649	for (auto & v: paramVars) {
1650	ftype->params.emplace_back(v->get_type());
1651	}
1652	for (auto & v: returnVars) {
1653	ftype->returns.emplace_back(v->get_type());
1654	}
1655	ftype->forall = std::move(forall);
1656	*/
1657
1658	// can function type have attributes? seems not to be the case.
1659	// visitType(old->type, ftype);
1660
1661	// collect assertions and put directly in FunctionDecl
1662	std::vector<ast::ptr<ast::DeclWithType>> assertions;
1663	for (auto & param: forall) {
1664	for (auto & asst: param->assertions) {
1665	assertf(asst->unique(), "newly converted decl must be unique");
1666	assertions.emplace_back(asst);
1667	}
1668	auto mut = param.get_and_mutate();
1669	assertf(mut == param, "newly converted decl must be unique");
1670	mut->assertions.clear();
1671	}
1672
1673	auto decl = new ast::FunctionDecl{
1674	old->location,
1675	old->name,
1676	// GET_ACCEPT_1(type, FunctionType),
1677	std::move(forall),
1678	std::move(assertions),
1679	std::move(paramVars),
1680	std::move(returnVars),
1681	{},
1682	{ old->storageClasses.val },
1683	{ old->linkage.val },
1684	GET_ACCEPT_V(attributes, Attribute),
1685	{ old->get_funcSpec().val },
1686	old->type->isVarArgs
1687	};
1688
1689	// decl->type = ftype;
1690	cache.emplace( old, decl );
1691
1692	decl->withExprs = GET_ACCEPT_V(withExprs, Expr);
1693	decl->stmts = GET_ACCEPT_1(statements, CompoundStmt);
1694	decl->scopeLevel = old->scopeLevel;
1695	decl->mangleName = old->mangleName;
1696	decl->isDeleted = old->isDeleted;
1697	decl->asmName = GET_ACCEPT_1(asmName, Expr);
1698	decl->uniqueId = old->uniqueId;
1699	decl->extension = old->extension;
1700
1701	this->node = decl;
1702
1703	if ( Validate::dereferenceOperator == old ) {
1704	ast::dereferenceOperator = decl;
1705	}
1706
1707	if ( Validate::dtorStructDestroy == old ) {
1708	ast::dtorStructDestroy = decl;
1709	}
1710	}
1711
1712	virtual void visit( const StructDecl * old ) override final {
1713	if ( inCache( old ) ) return;
1714	auto decl = new ast::StructDecl(
1715	old->location,
1716	old->name,
1717	(ast::AggregateDecl::Aggregate)old->kind,
1718	GET_ACCEPT_V(attributes, Attribute),
1719	{ old->linkage.val }
1720	);
1721	cache.emplace( old, decl );
1722	decl->parent = GET_ACCEPT_1(parent, AggregateDecl);
1723	decl->body = old->body;
1724	decl->params = GET_ACCEPT_V(parameters, TypeDecl);
1725	decl->members = GET_ACCEPT_V(members, Decl);
1726	decl->extension = old->extension;
1727	decl->uniqueId = old->uniqueId;
1728	decl->storage = { old->storageClasses.val };
1729
1730	this->node = decl;
1731
1732	if ( Validate::dtorStruct == old ) {
1733	ast::dtorStruct = decl;
1734	}
1735	}
1736
1737	virtual void visit( const UnionDecl * old ) override final {
1738	if ( inCache( old ) ) return;
1739	auto decl = new ast::UnionDecl(
1740	old->location,
1741	old->name,
1742	GET_ACCEPT_V(attributes, Attribute),
1743	{ old->linkage.val }
1744	);
1745	cache.emplace( old, decl );
1746	decl->parent = GET_ACCEPT_1(parent, AggregateDecl);
1747	decl->body = old->body;
1748	decl->params = GET_ACCEPT_V(parameters, TypeDecl);
1749	decl->members = GET_ACCEPT_V(members, Decl);
1750	decl->extension = old->extension;
1751	decl->uniqueId = old->uniqueId;
1752	decl->storage = { old->storageClasses.val };
1753
1754	this->node = decl;
1755	}
1756
1757
1758	virtual void visit( const EnumDecl * old ) override final {
1759	if ( inCache( old ) ) return;
1760	auto decl = new ast::EnumDecl(
1761	old->location,
1762	old->name,
1763	old->isTyped,
1764	GET_ACCEPT_V(attributes, Attribute),
1765	{ old->linkage.val },
1766	GET_ACCEPT_1(base, Type),
1767	old->enumValues
1768	);
1769	cache.emplace( old, decl );
1770	decl->parent = GET_ACCEPT_1(parent, AggregateDecl);
1771	decl->body = old->body;
1772	decl->params = GET_ACCEPT_V(parameters, TypeDecl);
1773	decl->members = GET_ACCEPT_V(members, Decl);
1774	decl->extension = old->extension;
1775	decl->uniqueId = old->uniqueId;
1776	decl->storage = { old->storageClasses.val };
1777	this->node = decl;
1778	}
1779
1780	virtual void visit( const TraitDecl * old ) override final {
1781	if ( inCache( old ) ) return;
1782	auto decl = new ast::TraitDecl(
1783	old->location,
1784	old->name,
1785	GET_ACCEPT_V(attributes, Attribute),
1786	{ old->linkage.val }
1787	);
1788	cache.emplace( old, decl );
1789	decl->parent = GET_ACCEPT_1(parent, AggregateDecl);
1790	decl->body = old->body;
1791	decl->params = GET_ACCEPT_V(parameters, TypeDecl);
1792	decl->members = GET_ACCEPT_V(members, Decl);
1793	decl->extension = old->extension;
1794	decl->uniqueId = old->uniqueId;
1795	decl->storage = { old->storageClasses.val };
1796
1797	this->node = decl;
1798	}
1799
1800	virtual void visit( const TypeDecl * old ) override final {
1801	if ( inCache( old ) ) return;
1802	auto decl = new ast::TypeDecl{
1803	old->location,
1804	old->name,
1805	{ old->storageClasses.val },
1806	GET_ACCEPT_1(base, Type),
1807	(ast::TypeDecl::Kind)(unsigned)old->kind,
1808	old->sized,
1809	GET_ACCEPT_1(init, Type)
1810	};
1811	cache.emplace( old, decl );
1812	decl->assertions = GET_ACCEPT_V(assertions, DeclWithType);
1813	decl->extension = old->extension;
1814	decl->uniqueId = old->uniqueId;
1815
1816	this->node = decl;
1817	}
1818
1819	virtual void visit( const TypedefDecl * old ) override final {
1820	auto decl = new ast::TypedefDecl(
1821	old->location,
1822	old->name,
1823	{ old->storageClasses.val },
1824	GET_ACCEPT_1(base, Type),
1825	{ old->linkage.val }
1826	);
1827	decl->assertions = GET_ACCEPT_V(assertions, DeclWithType);
1828	decl->extension = old->extension;
1829	decl->uniqueId = old->uniqueId;
1830	decl->storage = { old->storageClasses.val };
1831
1832	this->node = decl;
1833	}
1834
1835	virtual void visit( const AsmDecl * old ) override final {
1836	auto decl = new ast::AsmDecl{
1837	old->location,
1838	GET_ACCEPT_1(stmt, AsmStmt)
1839	};
1840	decl->extension = old->extension;
1841	decl->uniqueId = old->uniqueId;
1842	decl->storage = { old->storageClasses.val };
1843
1844	this->node = decl;
1845	}
1846
1847	virtual void visit( const DirectiveDecl * old ) override final {
1848	auto decl = new ast::DirectiveDecl{
1849	old->location,
1850	GET_ACCEPT_1(stmt, DirectiveStmt)
1851	};
1852	decl->extension = old->extension;
1853	decl->uniqueId = old->uniqueId;
1854	decl->storage = { old->storageClasses.val };
1855
1856	this->node = decl;
1857	}
1858
1859	virtual void visit( const StaticAssertDecl * old ) override final {
1860	auto decl = new ast::StaticAssertDecl{
1861	old->location,
1862	GET_ACCEPT_1(condition, Expr),
1863	GET_ACCEPT_1(message, ConstantExpr)
1864	};
1865	decl->extension = old->extension;
1866	decl->uniqueId = old->uniqueId;
1867	decl->storage = { old->storageClasses.val };
1868
1869	this->node = decl;
1870	}
1871
1872	virtual void visit( const InlineValueDecl * old ) override final {
1873	if ( inCache( old ) ) {
1874	return;
1875	}
1876	auto&& type = GET_ACCEPT_1(type, Type);
1877	auto&& attr = GET_ACCEPT_V(attributes, Attribute);
1878
1879	auto decl = new ast::InlineValueDecl(
1880	old->location,
1881	old->name,
1882	type,
1883	{ old->get_storageClasses().val },
1884	{ old->linkage.val },
1885	std::move(attr),
1886	{ old->get_funcSpec().val }
1887	);
1888	cache.emplace(old, decl);
1889	assert(cache.find( old ) != cache.end());
1890	decl->scopeLevel = old->scopeLevel;
1891	decl->mangleName = old->mangleName;
1892	decl->isDeleted = old->isDeleted;
1893	decl->asmName = GET_ACCEPT_1(asmName, Expr);
1894	decl->uniqueId = old->uniqueId;
1895	decl->extension = old->extension;
1896
1897	this->node = decl;
1898	}
1899
1900	virtual void visit( const CompoundStmt * old ) override final {
1901	if ( inCache( old ) ) return;
1902	auto stmt = new ast::CompoundStmt(
1903	old->location,
1904	to<std::list>::from( GET_ACCEPT_V(kids, Stmt) ),
1905	GET_LABELS_V(old->labels)
1906	);
1907
1908	this->node = stmt;
1909	cache.emplace( old, this->node );
1910	}
1911
1912	virtual void visit( const ExprStmt * old ) override final {
1913	if ( inCache( old ) ) return;
1914	this->node = new ast::ExprStmt(
1915	old->location,
1916	GET_ACCEPT_1(expr, Expr),
1917	GET_LABELS_V(old->labels)
1918	);
1919	cache.emplace( old, this->node );
1920	}
1921
1922	virtual void visit( const AsmStmt * old ) override final {
1923	if ( inCache( old ) ) return;
1924	this->node = new ast::AsmStmt(
1925	old->location,
1926	old->voltile,
1927	GET_ACCEPT_1(instruction, Expr),
1928	GET_ACCEPT_V(output, Expr),
1929	GET_ACCEPT_V(input, Expr),
1930	GET_ACCEPT_V(clobber, ConstantExpr),
1931	GET_LABELS_V(old->gotolabels),
1932	GET_LABELS_V(old->labels)
1933	);
1934	cache.emplace( old, this->node );
1935	}
1936
1937	virtual void visit( const DirectiveStmt * old ) override final {
1938	if ( inCache( old ) ) return;
1939	this->node = new ast::DirectiveStmt(
1940	old->location,
1941	old->directive,
1942	GET_LABELS_V(old->labels)
1943	);
1944	cache.emplace( old, this->node );
1945	}
1946
1947	virtual void visit( const IfStmt * old ) override final {
1948	if ( inCache( old ) ) return;
1949	this->node = new ast::IfStmt(
1950	old->location,
1951	GET_ACCEPT_1(condition, Expr),
1952	GET_ACCEPT_1(then, Stmt),
1953	GET_ACCEPT_1(else_, Stmt),
1954	GET_ACCEPT_V(initialization, Stmt),
1955	GET_LABELS_V(old->labels)
1956	);
1957	cache.emplace( old, this->node );
1958	}
1959
1960	virtual void visit( const SwitchStmt * old ) override final {
1961	if ( inCache( old ) ) return;
1962	this->node = new ast::SwitchStmt(
1963	old->location,
1964	GET_ACCEPT_1(condition, Expr),
1965	GET_ACCEPT_V(statements, CaseClause),
1966	GET_LABELS_V(old->labels)
1967	);
1968	cache.emplace( old, this->node );
1969	}
1970
1971	virtual void visit( const CaseStmt * old ) override final {
1972	if ( inCache( old ) ) return;
1973	this->node = new ast::CaseClause(
1974	old->location,
1975	GET_ACCEPT_1(condition, Expr),
1976	GET_ACCEPT_V(stmts, Stmt)
1977	);
1978	auto labels = GET_LABELS_V(old->labels);
1979	assertf(labels.empty(), "Labels found on CaseStmt.");
1980	cache.emplace( old, this->node );
1981	}
1982
1983	virtual void visit( const WhileDoStmt * old ) override final {
1984	if ( inCache( old ) ) return;
1985	this->node = new ast::WhileDoStmt(
1986	old->location,
1987	GET_ACCEPT_1(condition, Expr),
1988	GET_ACCEPT_1(body, Stmt),
1989	GET_ACCEPT_1(else_, Stmt),
1990	GET_ACCEPT_V(initialization, Stmt),
1991	old->isDoWhile,
1992	GET_LABELS_V(old->labels)
1993	);
1994	cache.emplace( old, this->node );
1995	}
1996
1997	virtual void visit( const ForStmt * old ) override final {
1998	if ( inCache( old ) ) return;
1999	this->node = new ast::ForStmt(
2000	old->location,
2001	GET_ACCEPT_V(initialization, Stmt),
2002	GET_ACCEPT_1(condition, Expr),
2003	GET_ACCEPT_1(increment, Expr),
2004	GET_ACCEPT_1(body, Stmt),
2005	GET_ACCEPT_1(else_, Stmt),
2006	GET_LABELS_V(old->labels)
2007	);
2008	cache.emplace( old, this->node );
2009	}
2010
2011	virtual void visit( const BranchStmt * old ) override final {
2012	if ( inCache( old ) ) return;
2013	if (old->computedTarget) {
2014	this->node = new ast::BranchStmt(
2015	old->location,
2016	GET_ACCEPT_1(computedTarget, Expr),
2017	GET_LABELS_V(old->labels)
2018	);
2019	} else {
2020	ast::BranchStmt::Kind kind;
2021	switch (old->type) {
2022	#define CASE(n) \
2023	case BranchStmt::n: \
2024	kind = ast::BranchStmt::n; \
2025	break
2026	CASE(Goto);
2027	CASE(Break);
2028	CASE(Continue);
2029	CASE(FallThrough);
2030	CASE(FallThroughDefault);
2031	#undef CASE
2032	default:
2033	assertf(false, "Invalid BranchStmt::Type %d\n", old->type);
2034	}
2035
2036	auto stmt = new ast::BranchStmt(
2037	old->location,
2038	kind,
2039	make_label(&old->originalTarget),
2040	GET_LABELS_V(old->labels)
2041	);
2042	stmt->target = make_label(&old->target);
2043	this->node = stmt;
2044	}
2045	cache.emplace( old, this->node );
2046	}
2047
2048	virtual void visit( const ReturnStmt * old ) override final {
2049	if ( inCache( old ) ) return;
2050	this->node = new ast::ReturnStmt(
2051	old->location,
2052	GET_ACCEPT_1(expr, Expr),
2053	GET_LABELS_V(old->labels)
2054	);
2055	cache.emplace( old, this->node );
2056	}
2057
2058	virtual void visit( const ThrowStmt * old ) override final {
2059	if ( inCache( old ) ) return;
2060	ast::ExceptionKind kind;
2061	switch (old->kind) {
2062	case ThrowStmt::Terminate:
2063	kind = ast::ExceptionKind::Terminate;
2064	break;
2065	case ThrowStmt::Resume:
2066	kind = ast::ExceptionKind::Resume;
2067	break;
2068	default:
2069	assertf(false, "Invalid ThrowStmt::Kind %d\n", old->kind);
2070	}
2071
2072	this->node = new ast::ThrowStmt(
2073	old->location,
2074	kind,
2075	GET_ACCEPT_1(expr, Expr),
2076	GET_ACCEPT_1(target, Expr),
2077	GET_LABELS_V(old->labels)
2078	);
2079	cache.emplace( old, this->node );
2080	}
2081
2082	virtual void visit( const TryStmt * old ) override final {
2083	if ( inCache( old ) ) return;
2084	this->node = new ast::TryStmt(
2085	old->location,
2086	GET_ACCEPT_1(block, CompoundStmt),
2087	GET_ACCEPT_V(handlers, CatchClause),
2088	GET_ACCEPT_1(finallyBlock, FinallyClause),
2089	GET_LABELS_V(old->labels)
2090	);
2091	cache.emplace( old, this->node );
2092	}
2093
2094	virtual void visit( const CatchStmt * old ) override final {
2095	if ( inCache( old ) ) return;
2096	ast::ExceptionKind kind;
2097	switch (old->kind) {
2098	case CatchStmt::Terminate:
2099	kind = ast::ExceptionKind::Terminate;
2100	break;
2101	case CatchStmt::Resume:
2102	kind = ast::ExceptionKind::Resume;
2103	break;
2104	default:
2105	assertf(false, "Invalid CatchStmt::Kind %d\n", old->kind);
2106	}
2107
2108	this->node = new ast::CatchClause(
2109	old->location,
2110	kind,
2111	GET_ACCEPT_1(decl, Decl),
2112	GET_ACCEPT_1(cond, Expr),
2113	GET_ACCEPT_1(body, Stmt)
2114	);
2115	auto labels = GET_LABELS_V(old->labels);
2116	assertf(labels.empty(), "Labels found on CatchStmt.");
2117	cache.emplace( old, this->node );
2118	}
2119
2120	virtual void visit( const FinallyStmt * old ) override final {
2121	if ( inCache( old ) ) return;
2122	this->node = new ast::FinallyClause(
2123	old->location,
2124	GET_ACCEPT_1(block, CompoundStmt)
2125	);
2126	auto labels = GET_LABELS_V(old->labels);
2127	assertf(labels.empty(), "Labels found on FinallyStmt.");
2128	cache.emplace( old, this->node );
2129	}
2130
2131	virtual void visit( const SuspendStmt * old ) override final {
2132	if ( inCache( old ) ) return;
2133	ast::SuspendStmt::Type type;
2134	switch (old->type) {
2135	case SuspendStmt::Coroutine: type = ast::SuspendStmt::Coroutine; break;
2136	case SuspendStmt::Generator: type = ast::SuspendStmt::Generator; break;
2137	case SuspendStmt::None : type = ast::SuspendStmt::None ; break;
2138	default: abort();
2139	}
2140	this->node = new ast::SuspendStmt(
2141	old->location,
2142	GET_ACCEPT_1(then , CompoundStmt),
2143	type,
2144	GET_LABELS_V(old->labels)
2145	);
2146	cache.emplace( old, this->node );
2147	}
2148
2149	virtual void visit( const WaitForStmt * old ) override final {
2150	if ( inCache( old ) ) return;
2151	ast::WaitForStmt * stmt = new ast::WaitForStmt(
2152	old->location,
2153	GET_LABELS_V(old->labels)
2154	);
2155
2156	stmt->clauses.reserve( old->clauses.size() );
2157	for (size_t i = 0 ; i < old->clauses.size() ; ++i) {
2158	auto clause = new ast::WaitForClause( old->location );
2159
2160	clause->target_func = GET_ACCEPT_1(clauses[i].target.function, Expr);
2161	clause->target_args = GET_ACCEPT_V(clauses[i].target.arguments, Expr);
2162	clause->stmt = GET_ACCEPT_1(clauses[i].statement, Stmt);
2163	clause->cond = GET_ACCEPT_1(clauses[i].condition, Expr);
2164
2165	stmt->clauses.push_back( clause );
2166	}
2167	stmt->timeout_time = GET_ACCEPT_1(timeout.time, Expr);
2168	stmt->timeout_stmt = GET_ACCEPT_1(timeout.statement, Stmt);
2169	stmt->timeout_cond = GET_ACCEPT_1(timeout.condition, Expr);
2170	stmt->else_stmt = GET_ACCEPT_1(orelse.statement, Stmt);
2171	stmt->else_cond = GET_ACCEPT_1(orelse.condition, Expr);
2172
2173	this->node = stmt;
2174	cache.emplace( old, this->node );
2175	}
2176
2177	virtual void visit( const WithStmt * old ) override final {
2178	if ( inCache( old ) ) return;
2179	this->node = new ast::WithStmt(
2180	old->location,
2181	GET_ACCEPT_V(exprs, Expr),
2182	GET_ACCEPT_1(stmt, Stmt)
2183	);
2184	cache.emplace( old, this->node );
2185	}
2186
2187	virtual void visit( const NullStmt * old ) override final {
2188	if ( inCache( old ) ) return;
2189	this->node = new ast::NullStmt(
2190	old->location,
2191	GET_LABELS_V(old->labels)
2192	);
2193	cache.emplace( old, this->node );
2194	}
2195
2196	virtual void visit( const DeclStmt * old ) override final {
2197	if ( inCache( old ) ) return;
2198	this->node = new ast::DeclStmt(
2199	old->location,
2200	GET_ACCEPT_1(decl, Decl),
2201	GET_LABELS_V(old->labels)
2202	);
2203	cache.emplace( old, this->node );
2204	}
2205
2206	virtual void visit( const ImplicitCtorDtorStmt * old ) override final {
2207	if ( inCache( old ) ) return;
2208	auto stmt = new ast::ImplicitCtorDtorStmt(
2209	old->location,
2210	nullptr,
2211	GET_LABELS_V(old->labels)
2212	);
2213	cache.emplace( old, stmt );
2214	stmt->callStmt = GET_ACCEPT_1(callStmt, Stmt);
2215	this->node = stmt;
2216	}
2217
2218	virtual void visit( const MutexStmt * old ) override final {
2219	if ( inCache( old ) ) return;
2220	this->node = new ast::MutexStmt(
2221	old->location,
2222	GET_ACCEPT_1(stmt, Stmt),
2223	GET_ACCEPT_V(mutexObjs, Expr)
2224	);
2225	cache.emplace( old, this->node );
2226	}
2227
2228	// TypeSubstitution shouldn't exist yet in old.
2229	ast::TypeSubstitution * convertTypeSubstitution(const TypeSubstitution * old) {
2230
2231	if (!old) return nullptr;
2232	if (old->empty()) return nullptr;
2233	assert(false);
2234
2235	/*
2236	ast::TypeSubstitution *rslt = new ast::TypeSubstitution();
2237
2238	for (decltype(old->begin()) old_i = old->begin(); old_i != old->end(); old_i++) {
2239	rslt->add( old_i->first,
2240	getAccept1<ast::Type>(old_i->second) );
2241	}
2242
2243	return rslt;
2244	*/
2245	}
2246
2247	void convertInferUnion(ast::Expr::InferUnion &newInferred,
2248	const std::map<UniqueId,ParamEntry> &oldInferParams,
2249	const std::vector<UniqueId> &oldResnSlots) {
2250
2251	assert( oldInferParams.empty() \|\| oldResnSlots.empty() );
2252	// assert( newInferred.mode == ast::Expr::InferUnion::Empty );
2253
2254	if ( !oldInferParams.empty() ) {
2255	ast::InferredParams &tgt = newInferred.inferParams();
2256	for (auto & old : oldInferParams) {
2257	tgt[old.first] = ast::ParamEntry(
2258	old.second.decl,
2259	getAccept1<ast::Decl>(old.second.declptr),
2260	getAccept1<ast::Type>(old.second.actualType),
2261	getAccept1<ast::Type>(old.second.formalType),
2262	getAccept1<ast::Expr>(old.second.expr)
2263	);
2264	}
2265	} else if ( !oldResnSlots.empty() ) {
2266	ast::ResnSlots &tgt = newInferred.resnSlots();
2267	for (auto old : oldResnSlots) {
2268	tgt.push_back(old);
2269	}
2270	}
2271	}
2272
2273	ast::Expr * visitBaseExpr_SkipResultType( const Expression * old, ast::Expr * nw) {
2274
2275	nw->env = convertTypeSubstitution(old->env);
2276
2277	nw->extension = old->extension;
2278	convertInferUnion(nw->inferred, old->inferParams, old->resnSlots);
2279
2280	return nw;
2281	}
2282
2283	ast::Expr * visitBaseExpr( const Expression * old, ast::Expr * nw) {
2284
2285	nw->result = GET_ACCEPT_1(result, Type);
2286	return visitBaseExpr_SkipResultType(old, nw);;
2287	}
2288
2289	virtual void visit( const ApplicationExpr * old ) override final {
2290	this->node = visitBaseExpr( old,
2291	new ast::ApplicationExpr(
2292	old->location,
2293	GET_ACCEPT_1(function, Expr),
2294	GET_ACCEPT_V(args, Expr)
2295	)
2296	);
2297	}
2298
2299	virtual void visit( const UntypedExpr * old ) override final {
2300	this->node = visitBaseExpr( old,
2301	new ast::UntypedExpr(
2302	old->location,
2303	GET_ACCEPT_1(function, Expr),
2304	GET_ACCEPT_V(args, Expr)
2305	)
2306	);
2307	}
2308
2309	virtual void visit( const NameExpr * old ) override final {
2310	this->node = visitBaseExpr( old,
2311	new ast::NameExpr(
2312	old->location,
2313	old->get_name()
2314	)
2315	);
2316	}
2317
2318	virtual void visit( const QualifiedNameExpr * old ) override final {
2319	this->node = visitBaseExpr( old,
2320	new ast::QualifiedNameExpr (
2321	old->location,
2322	GET_ACCEPT_1(type_decl, Decl),
2323	old->name
2324	)
2325	);
2326	}
2327
2328	virtual void visit( const CastExpr * old ) override final {
2329	this->node = visitBaseExpr( old,
2330	new ast::CastExpr(
2331	old->location,
2332	GET_ACCEPT_1(arg, Expr),
2333	old->isGenerated ? ast::GeneratedCast : ast::ExplicitCast
2334	)
2335	);
2336	}
2337
2338	virtual void visit( const KeywordCastExpr * old ) override final {
2339	ast::AggregateDecl::Aggregate castTarget = (ast::AggregateDecl::Aggregate)old->target;
2340	assert( ast::AggregateDecl::Generator <= castTarget && castTarget <= ast::AggregateDecl::Thread );
2341	this->node = visitBaseExpr( old,
2342	new ast::KeywordCastExpr(
2343	old->location,
2344	GET_ACCEPT_1(arg, Expr),
2345	castTarget,
2346	{old->concrete_target.field, old->concrete_target.getter}
2347	)
2348	);
2349	}
2350
2351	virtual void visit( const VirtualCastExpr * old ) override final {
2352	this->node = visitBaseExpr_SkipResultType( old,
2353	new ast::VirtualCastExpr(
2354	old->location,
2355	GET_ACCEPT_1(arg, Expr),
2356	GET_ACCEPT_1(result, Type)
2357	)
2358	);
2359	}
2360
2361	virtual void visit( const AddressExpr * old ) override final {
2362	this->node = visitBaseExpr( old,
2363	new ast::AddressExpr(
2364	old->location,
2365	GET_ACCEPT_1(arg, Expr)
2366	)
2367	);
2368	}
2369
2370	virtual void visit( const LabelAddressExpr * old ) override final {
2371	this->node = visitBaseExpr( old,
2372	new ast::LabelAddressExpr(
2373	old->location,
2374	make_label(&old->arg)
2375	)
2376	);
2377	}
2378
2379	virtual void visit( const UntypedMemberExpr * old ) override final {
2380	this->node = visitBaseExpr( old,
2381	new ast::UntypedMemberExpr(
2382	old->location,
2383	GET_ACCEPT_1(member, Expr),
2384	GET_ACCEPT_1(aggregate, Expr)
2385	)
2386	);
2387	}
2388
2389	virtual void visit( const MemberExpr * old ) override final {
2390	this->node = visitBaseExpr( old,
2391	new ast::MemberExpr(
2392	old->location,
2393	GET_ACCEPT_1(member, DeclWithType),
2394	GET_ACCEPT_1(aggregate, Expr),
2395	ast::MemberExpr::NoOpConstructionChosen
2396	)
2397	);
2398	}
2399
2400	virtual void visit( const VariableExpr * old ) override final {
2401	auto expr = new ast::VariableExpr(
2402	old->location
2403	);
2404
2405	expr->var = GET_ACCEPT_1(var, DeclWithType);
2406	visitBaseExpr( old, expr );
2407
2408	this->node = expr;
2409	}
2410
2411	virtual void visit( const ConstantExpr * old ) override final {
2412	ast::ConstantExpr *rslt = new ast::ConstantExpr(
2413	old->location,
2414	GET_ACCEPT_1(result, Type),
2415	old->constant.rep,
2416	old->constant.ival
2417	);
2418	rslt->underlyer = getAccept1< ast::Type, Type* >( old->constant.type );
2419	this->node = visitBaseExpr( old, rslt );
2420	}
2421
2422	virtual void visit( const SizeofExpr * old ) override final {
2423	assert (old->expr \|\| old->type);
2424	assert (! (old->expr && old->type));
2425	ast::SizeofExpr *rslt;
2426	if (old->expr) {
2427	assert(!old->isType);
2428	rslt = new ast::SizeofExpr(
2429	old->location,
2430	GET_ACCEPT_1(expr, Expr)
2431	);
2432	}
2433	if (old->type) {
2434	assert(old->isType);
2435	rslt = new ast::SizeofExpr(
2436	old->location,
2437	GET_ACCEPT_1(type, Type)
2438	);
2439	}
2440	this->node = visitBaseExpr( old, rslt );
2441	}
2442
2443	virtual void visit( const AlignofExpr * old ) override final {
2444	assert (old->expr \|\| old->type);
2445	assert (! (old->expr && old->type));
2446	ast::AlignofExpr *rslt;
2447	if (old->expr) {
2448	assert(!old->isType);
2449	rslt = new ast::AlignofExpr(
2450	old->location,
2451	GET_ACCEPT_1(expr, Expr)
2452	);
2453	}
2454	if (old->type) {
2455	assert(old->isType);
2456	rslt = new ast::AlignofExpr(
2457	old->location,
2458	GET_ACCEPT_1(type, Type)
2459	);
2460	}
2461	this->node = visitBaseExpr( old, rslt );
2462	}
2463
2464	virtual void visit( const UntypedOffsetofExpr * old ) override final {
2465	this->node = visitBaseExpr( old,
2466	new ast::UntypedOffsetofExpr(
2467	old->location,
2468	GET_ACCEPT_1(type, Type),
2469	old->member
2470	)
2471	);
2472	}
2473
2474	virtual void visit( const OffsetofExpr * old ) override final {
2475	this->node = visitBaseExpr( old,
2476	new ast::OffsetofExpr(
2477	old->location,
2478	GET_ACCEPT_1(type, Type),
2479	GET_ACCEPT_1(member, DeclWithType)
2480	)
2481	);
2482	}
2483
2484	virtual void visit( const OffsetPackExpr * old ) override final {
2485	this->node = visitBaseExpr( old,
2486	new ast::OffsetPackExpr(
2487	old->location,
2488	GET_ACCEPT_1(type, StructInstType)
2489	)
2490	);
2491	}
2492
2493	virtual void visit( const LogicalExpr * old ) override final {
2494	this->node = visitBaseExpr( old,
2495	new ast::LogicalExpr(
2496	old->location,
2497	GET_ACCEPT_1(arg1, Expr),
2498	GET_ACCEPT_1(arg2, Expr),
2499	old->get_isAnd() ?
2500	ast::LogicalFlag::AndExpr :
2501	ast::LogicalFlag::OrExpr
2502	)
2503	);
2504	}
2505
2506	virtual void visit( const ConditionalExpr * old ) override final {
2507	this->node = visitBaseExpr( old,
2508	new ast::ConditionalExpr(
2509	old->location,
2510	GET_ACCEPT_1(arg1, Expr),
2511	GET_ACCEPT_1(arg2, Expr),
2512	GET_ACCEPT_1(arg3, Expr)
2513	)
2514	);
2515	}
2516
2517	virtual void visit( const CommaExpr * old ) override final {
2518	this->node = visitBaseExpr( old,
2519	new ast::CommaExpr(
2520	old->location,
2521	GET_ACCEPT_1(arg1, Expr),
2522	GET_ACCEPT_1(arg2, Expr)
2523	)
2524	);
2525	}
2526
2527	virtual void visit( const TypeExpr * old ) override final {
2528	this->node = visitBaseExpr( old,
2529	new ast::TypeExpr(
2530	old->location,
2531	GET_ACCEPT_1(type, Type)
2532	)
2533	);
2534	}
2535
2536	virtual void visit( const DimensionExpr * old ) override final {
2537	this->node = visitBaseExpr( old,
2538	new ast::DimensionExpr( old->location, old->name )
2539	);
2540	}
2541
2542	virtual void visit( const AsmExpr * old ) override final {
2543	this->node = visitBaseExpr( old,
2544	new ast::AsmExpr(
2545	old->location,
2546	old->inout,
2547	GET_ACCEPT_1(constraint, Expr),
2548	GET_ACCEPT_1(operand, Expr)
2549	)
2550	);
2551	}
2552
2553	virtual void visit( const ImplicitCopyCtorExpr * old ) override final {
2554	auto rslt = new ast::ImplicitCopyCtorExpr(
2555	old->location,
2556	GET_ACCEPT_1(callExpr, ApplicationExpr)
2557	);
2558
2559	this->node = visitBaseExpr( old, rslt );
2560	}
2561
2562	virtual void visit( const ConstructorExpr * old ) override final {
2563	this->node = visitBaseExpr( old,
2564	new ast::ConstructorExpr(
2565	old->location,
2566	GET_ACCEPT_1(callExpr, Expr)
2567	)
2568	);
2569	}
2570
2571	virtual void visit( const CompoundLiteralExpr * old ) override final {
2572	this->node = visitBaseExpr_SkipResultType( old,
2573	new ast::CompoundLiteralExpr(
2574	old->location,
2575	GET_ACCEPT_1(result, Type),
2576	GET_ACCEPT_1(initializer, Init)
2577	)
2578	);
2579	}
2580
2581	virtual void visit( const RangeExpr * old ) override final {
2582	this->node = visitBaseExpr( old,
2583	new ast::RangeExpr(
2584	old->location,
2585	GET_ACCEPT_1(low, Expr),
2586	GET_ACCEPT_1(high, Expr)
2587	)
2588	);
2589	}
2590
2591	virtual void visit( const UntypedTupleExpr * old ) override final {
2592	this->node = visitBaseExpr( old,
2593	new ast::UntypedTupleExpr(
2594	old->location,
2595	GET_ACCEPT_V(exprs, Expr)
2596	)
2597	);
2598	}
2599
2600	virtual void visit( const TupleExpr * old ) override final {
2601	this->node = visitBaseExpr( old,
2602	new ast::TupleExpr(
2603	old->location,
2604	GET_ACCEPT_V(exprs, Expr)
2605	)
2606	);
2607	}
2608
2609	virtual void visit( const TupleIndexExpr * old ) override final {
2610	this->node = visitBaseExpr( old,
2611	new ast::TupleIndexExpr(
2612	old->location,
2613	GET_ACCEPT_1(tuple, Expr),
2614	old->index
2615	)
2616	);
2617	}
2618
2619	virtual void visit( const TupleAssignExpr * old ) override final {
2620	this->node = visitBaseExpr_SkipResultType( old,
2621	new ast::TupleAssignExpr(
2622	old->location,
2623	GET_ACCEPT_1(result, Type),
2624	GET_ACCEPT_1(stmtExpr, StmtExpr)
2625	)
2626	);
2627	}
2628
2629	virtual void visit( const StmtExpr * old ) override final {
2630	auto rslt = new ast::StmtExpr(
2631	old->location,
2632	GET_ACCEPT_1(statements, CompoundStmt)
2633	);
2634	rslt->returnDecls = GET_ACCEPT_V(returnDecls, ObjectDecl);
2635	rslt->dtors = GET_ACCEPT_V(dtors , Expr);
2636
2637	this->node = visitBaseExpr_SkipResultType( old, rslt );
2638	}
2639
2640	virtual void visit( const UniqueExpr * old ) override final {
2641	auto rslt = new ast::UniqueExpr(
2642	old->location,
2643	GET_ACCEPT_1(expr, Expr),
2644	old->get_id()
2645	);
2646	rslt->object = GET_ACCEPT_1(object, ObjectDecl);
2647	rslt->var = GET_ACCEPT_1(var , VariableExpr);
2648
2649	this->node = visitBaseExpr( old, rslt );
2650	}
2651
2652	virtual void visit( const UntypedInitExpr * old ) override final {
2653	std::deque<ast::InitAlternative> initAlts;
2654	for (auto ia : old->initAlts) {
2655	initAlts.push_back(ast::InitAlternative(
2656	getAccept1< ast::Type, Type * >( ia.type ),
2657	getAccept1< ast::Designation, Designation * >( ia.designation )
2658	));
2659	}
2660	this->node = visitBaseExpr( old,
2661	new ast::UntypedInitExpr(
2662	old->location,
2663	GET_ACCEPT_1(expr, Expr),
2664	std::move(initAlts)
2665	)
2666	);
2667	}
2668
2669	virtual void visit( const InitExpr * old ) override final {
2670	this->node = visitBaseExpr( old,
2671	new ast::InitExpr(
2672	old->location,
2673	GET_ACCEPT_1(expr, Expr),
2674	GET_ACCEPT_1(designation, Designation)
2675	)
2676	);
2677	}
2678
2679	virtual void visit( const DeletedExpr * old ) override final {
2680	this->node = visitBaseExpr( old,
2681	new ast::DeletedExpr(
2682	old->location,
2683	GET_ACCEPT_1(expr, Expr),
2684	inCache(old->deleteStmt) ?
2685	strict_dynamic_cast<ast::Decl*>(this->node) :
2686	GET_ACCEPT_1(deleteStmt, Decl)
2687	)
2688	);
2689	}
2690
2691	virtual void visit( const DefaultArgExpr * old ) override final {
2692	this->node = visitBaseExpr( old,
2693	new ast::DefaultArgExpr(
2694	old->location,
2695	GET_ACCEPT_1(expr, Expr)
2696	)
2697	);
2698	}
2699
2700	virtual void visit( const GenericExpr * old ) override final {
2701	std::vector<ast::GenericExpr::Association> associations;
2702	for (auto association : old->associations) {
2703	associations.push_back(ast::GenericExpr::Association(
2704	getAccept1< ast::Type, Type * >( association.type ),
2705	getAccept1< ast::Expr, Expression * >( association.expr )
2706	));
2707	}
2708	this->node = visitBaseExpr( old,
2709	new ast::GenericExpr(
2710	old->location,
2711	GET_ACCEPT_1(control, Expr),
2712	std::move(associations)
2713	)
2714	);
2715	}
2716
2717	void visitType( const Type * old, ast::Type * type ) {
2718	// Some types do this in their constructor so add a check.
2719	if ( !old->attributes.empty() && type->attributes.empty() ) {
2720	type->attributes = GET_ACCEPT_V(attributes, Attribute);
2721	}
2722	this->node = type;
2723	}
2724
2725	virtual void visit( const VoidType * old ) override final {
2726	visitType( old, new ast::VoidType{ cv( old ) } );
2727	}
2728
2729	virtual void visit( const BasicType * old ) override final {
2730	auto type = new ast::BasicType{ (ast::BasicType::Kind)(unsigned)old->kind, cv( old ) };
2731	// I believe this should always be a BasicType.
2732	if ( Validate::SizeType == old ) {
2733	ast::sizeType = type;
2734	}
2735	visitType( old, type );
2736	}
2737
2738	virtual void visit( const PointerType * old ) override final {
2739	visitType( old, new ast::PointerType{
2740	GET_ACCEPT_1( base, Type ),
2741	GET_ACCEPT_1( dimension, Expr ),
2742	(ast::LengthFlag)old->isVarLen,
2743	(ast::DimensionFlag)old->isStatic,
2744	cv( old )
2745	} );
2746	}
2747
2748	virtual void visit( const ArrayType * old ) override final {
2749	visitType( old, new ast::ArrayType{
2750	GET_ACCEPT_1( base, Type ),
2751	GET_ACCEPT_1( dimension, Expr ),
2752	(ast::LengthFlag)old->isVarLen,
2753	(ast::DimensionFlag)old->isStatic,
2754	cv( old )
2755	} );
2756	}
2757
2758	virtual void visit( const ReferenceType * old ) override final {
2759	visitType( old, new ast::ReferenceType{
2760	GET_ACCEPT_1( base, Type ),
2761	cv( old )
2762	} );
2763	}
2764
2765	virtual void visit( const QualifiedType * old ) override final {
2766	visitType( old, new ast::QualifiedType{
2767	GET_ACCEPT_1( parent, Type ),
2768	GET_ACCEPT_1( child, Type ),
2769	cv( old )
2770	} );
2771	}
2772
2773	virtual void visit( const FunctionType * old ) override final {
2774	auto ty = new ast::FunctionType {
2775	(ast::ArgumentFlag)old->isVarArgs,
2776	cv( old )
2777	};
2778	auto returnVars = GET_ACCEPT_V(returnVals, DeclWithType);
2779	auto paramVars = GET_ACCEPT_V(parameters, DeclWithType);
2780	// ty->returns = GET_ACCEPT_V( returnVals, DeclWithType );
2781	// ty->params = GET_ACCEPT_V( parameters, DeclWithType );
2782	for (auto & v: returnVars) {
2783	ty->returns.emplace_back(v->get_type());
2784	}
2785	for (auto & v: paramVars) {
2786	ty->params.emplace_back(v->get_type());
2787	}
2788	// xxx - when will this be non-null?
2789	// will have to create dangling (no-owner) decls to be pointed to
2790	auto foralls = GET_ACCEPT_V( forall, TypeDecl );
2791
2792	for (auto & param : foralls) {
2793	ty->forall.emplace_back(new ast::TypeInstType(param));
2794	for (auto asst : param->assertions) {
2795	ty->assertions.emplace_back(
2796	new ast::VariableExpr(param->location, asst));
2797	}
2798	}
2799	visitType( old, ty );
2800	}
2801
2802	void postvisit( const ReferenceToType * old, ast::BaseInstType * ty ) {
2803	ty->params = GET_ACCEPT_V( parameters, Expr );
2804	ty->hoistType = old->hoistType;
2805	visitType( old, ty );
2806	}
2807
2808	virtual void visit( const StructInstType * old ) override final {
2809	ast::StructInstType * ty;
2810	if ( old->baseStruct ) {
2811	ty = new ast::StructInstType{
2812	GET_ACCEPT_1( baseStruct, StructDecl ),
2813	cv( old ),
2814	GET_ACCEPT_V( attributes, Attribute )
2815	};
2816	} else {
2817	ty = new ast::StructInstType{
2818	old->name,
2819	cv( old ),
2820	GET_ACCEPT_V( attributes, Attribute )
2821	};
2822	}
2823	postvisit( old, ty );
2824	}
2825
2826	virtual void visit( const UnionInstType * old ) override final {
2827	ast::UnionInstType * ty;
2828	if ( old->baseUnion ) {
2829	ty = new ast::UnionInstType{
2830	GET_ACCEPT_1( baseUnion, UnionDecl ),
2831	cv( old ),
2832	GET_ACCEPT_V( attributes, Attribute )
2833	};
2834	} else {
2835	ty = new ast::UnionInstType{
2836	old->name,
2837	cv( old ),
2838	GET_ACCEPT_V( attributes, Attribute )
2839	};
2840	}
2841	postvisit( old, ty );
2842	}
2843
2844	virtual void visit( const EnumInstType * old ) override final {
2845	ast::EnumInstType * ty;
2846	if ( old->baseEnum ) {
2847	ty = new ast::EnumInstType{
2848	GET_ACCEPT_1( baseEnum, EnumDecl ),
2849	cv( old ),
2850	GET_ACCEPT_V( attributes, Attribute )
2851	};
2852	} else {
2853	ty = new ast::EnumInstType{
2854	old->name,
2855	cv( old ),
2856	GET_ACCEPT_V( attributes, Attribute )
2857	};
2858	}
2859	postvisit( old, ty );
2860	}
2861
2862	virtual void visit( const TraitInstType * old ) override final {
2863	ast::TraitInstType * ty;
2864	if ( old->baseTrait ) {
2865	ty = new ast::TraitInstType{
2866	GET_ACCEPT_1( baseTrait, TraitDecl ),
2867	cv( old ),
2868	GET_ACCEPT_V( attributes, Attribute )
2869	};
2870	} else {
2871	ty = new ast::TraitInstType{
2872	old->name,
2873	cv( old ),
2874	GET_ACCEPT_V( attributes, Attribute )
2875	};
2876	}
2877	postvisit( old, ty );
2878	}
2879
2880	virtual void visit( const TypeInstType * old ) override final {
2881	ast::TypeInstType * ty;
2882	if ( old->baseType ) {
2883	ty = new ast::TypeInstType{
2884	old->name,
2885	GET_ACCEPT_1( baseType, TypeDecl ),
2886	cv( old ),
2887	GET_ACCEPT_V( attributes, Attribute )
2888	};
2889	} else {
2890	ty = new ast::TypeInstType{
2891	old->name,
2892	old->isFtype ? ast::TypeDecl::Ftype : ast::TypeDecl::Dtype,
2893	cv( old ),
2894	GET_ACCEPT_V( attributes, Attribute )
2895	};
2896	}
2897	postvisit( old, ty );
2898	}
2899
2900	virtual void visit( const TupleType * old ) override final {
2901	visitType( old, new ast::TupleType{
2902	GET_ACCEPT_V( types, Type ),
2903	// members generated by TupleType c'tor
2904	cv( old )
2905	} );
2906	}
2907
2908	virtual void visit( const TypeofType * old ) override final {
2909	visitType( old, new ast::TypeofType{
2910	GET_ACCEPT_1( expr, Expr ),
2911	(ast::TypeofType::Kind)old->is_basetypeof,
2912	cv( old )
2913	} );
2914	}
2915
2916	virtual void visit( const VTableType * old ) override final {
2917	visitType( old, new ast::VTableType{
2918	GET_ACCEPT_1( base, Type ),
2919	cv( old )
2920	} );
2921	}
2922
2923	virtual void visit( const AttrType * ) override final {
2924	assertf( false, "AttrType deprecated in new AST." );
2925	}
2926
2927	virtual void visit( const VarArgsType * old ) override final {
2928	visitType( old, new ast::VarArgsType{ cv( old ) } );
2929	}
2930
2931	virtual void visit( const ZeroType * old ) override final {
2932	visitType( old, new ast::ZeroType{ cv( old ) } );
2933	}
2934
2935	virtual void visit( const OneType * old ) override final {
2936	visitType( old, new ast::OneType{ cv( old ) } );
2937	}
2938
2939	virtual void visit( const GlobalScopeType * old ) override final {
2940	visitType( old, new ast::GlobalScopeType{} );
2941	}
2942
2943	virtual void visit( const Designation * old ) override final {
2944	this->node = new ast::Designation(
2945	old->location,
2946	GET_ACCEPT_D(designators, Expr)
2947	);
2948	}
2949
2950	virtual void visit( const SingleInit * old ) override final {
2951	this->node = new ast::SingleInit(
2952	old->location,
2953	GET_ACCEPT_1(value, Expr),
2954	(old->get_maybeConstructed()) ? ast::MaybeConstruct : ast::NoConstruct
2955	);
2956	}
2957
2958	virtual void visit( const ListInit * old ) override final {
2959	this->node = new ast::ListInit(
2960	old->location,
2961	GET_ACCEPT_V(initializers, Init),
2962	GET_ACCEPT_V(designations, Designation),
2963	(old->get_maybeConstructed()) ? ast::MaybeConstruct : ast::NoConstruct
2964	);
2965	}
2966
2967	virtual void visit( const ConstructorInit * old ) override final {
2968	this->node = new ast::ConstructorInit(
2969	old->location,
2970	GET_ACCEPT_1(ctor, Stmt),
2971	GET_ACCEPT_1(dtor, Stmt),
2972	GET_ACCEPT_1(init, Init)
2973	);
2974	}
2975
2976	virtual void visit( const Constant * ) override final {
2977	// Handled in visit( ConstantEpxr * ).
2978	// In the new tree, Constant fields are inlined into containing ConstantExpression.
2979	assert( 0 );
2980	}
2981
2982	virtual void visit( const Attribute * old ) override final {
2983	this->node = new ast::Attribute(
2984	old->name,
2985	GET_ACCEPT_V( parameters, Expr )
2986	);
2987	}
2988	};
2989
2990	#undef GET_LABELS_V
2991	#undef GET_ACCEPT_V
2992	#undef GET_ACCEPT_1
2993
2994	ast::TranslationUnit convert( const std::list< Declaration * > && translationUnit ) {
2995	ConverterOldToNew c;
2996	ast::TranslationUnit unit;
2997	if (Validate::SizeType) {
2998	// this should be a BasicType.
2999	auto old = strict_dynamic_cast<BasicType *>(Validate::SizeType);
3000	ast::sizeType = new ast::BasicType{ (ast::BasicType::Kind)(unsigned)old->kind };
3001	}
3002
3003	for(auto d : translationUnit) {
3004	d->accept( c );
3005	unit.decls.emplace_back( c.decl() );
3006	}
3007	deleteAll(translationUnit);
3008
3009	// Load the local static varables into the global store.
3010	unit.global.sizeType = ast::sizeType;
3011	unit.global.dereference = ast::dereferenceOperator;
3012	unit.global.dtorStruct = ast::dtorStruct;
3013	unit.global.dtorDestroy = ast::dtorStructDestroy;
3014
3015	return unit;
3016	}

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