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source: src/GenPoly/GenPoly.cc @ 8a97248

ADTast-experimental

Last change on this file since 8a97248 was a0d1f1c, checked in by Andrew Beach <ajbeach@…>, 22 months ago
Header Clean-up: Removed no longer needed includes from typeops, and one from Node.
Property mode set to `100644`
File size: 31.7 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 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	// GenPoly.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Mon May 18 07:44:20 2015
11	// Last Modified By : Andrew Beach
12	// Last Modified On : Mon Oct 24 15:19:00 2022
13	// Update Count : 17
14	//
15
16	#include "GenPoly.h"
17
18	#include <cassert> // for assertf, assert
19	#include <iostream> // for operator<<, ostream, basic_os...
20	#include <iterator> // for back_insert_iterator, back_in...
21	#include <list> // for list, _List_iterator, list<>:...
22	#include <typeindex> // for type_index
23	#include <utility> // for pair
24	#include <vector> // for vector
25
26	#include "AST/Expr.hpp"
27	#include "AST/Type.hpp"
28	#include "AST/TypeSubstitution.hpp"
29	#include "GenPoly/ErasableScopedMap.h" // for ErasableScopedMap<>::const_it...
30	#include "ResolvExpr/typeops.h" // for flatten
31	#include "SynTree/Constant.h" // for Constant
32	#include "SynTree/Expression.h" // for Expression, TypeExpr, Constan...
33	#include "SynTree/Type.h" // for Type, StructInstType, UnionIn...
34	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
35
36	using namespace std;
37
38	namespace GenPoly {
39	namespace {
40	/// Checks a parameter list for polymorphic parameters; will substitute according to env if present
41	bool hasPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
42	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
43	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
44	assertf(paramType, "Aggregate parameters should be type expressions");
45	if ( isPolyType( paramType->get_type(), env ) ) return true;
46	}
47	return false;
48	}
49
50	bool hasPolyParams( const std::vector<ast::ptr<ast::Expr>> & params, const ast::TypeSubstitution * env) {
51	for (auto &param : params) {
52	auto paramType = param.strict_as<ast::TypeExpr>();
53	if (isPolyType(paramType->type, env)) return true;
54	}
55	return false;
56	}
57
58	/// Checks a parameter list for polymorphic parameters from tyVars; will substitute according to env if present
59	bool hasPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
60	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
61	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
62	assertf(paramType, "Aggregate parameters should be type expressions");
63	if ( isPolyType( paramType->get_type(), tyVars, env ) ) return true;
64	}
65	return false;
66	}
67
68	/// Checks a parameter list for dynamic-layout parameters from tyVars; will substitute according to env if present
69	bool hasDynParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
70	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
71	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
72	assertf(paramType, "Aggregate parameters should be type expressions");
73	if ( isDynType( paramType->get_type(), tyVars, env ) ) return true;
74	}
75	return false;
76	}
77
78	bool hasDynParams(
79	const std::vector<ast::ptr<ast::Expr>> & params,
80	const TypeVarMap & typeVars,
81	const ast::TypeSubstitution * subst ) {
82	for ( ast::ptr<ast::Expr> const & paramExpr : params ) {
83	auto param = paramExpr.as<ast::TypeExpr>();
84	assertf( param, "Aggregate parameters should be type expressions." );
85	if ( isDynType( param->type.get(), typeVars, subst ) ) {
86	return true;
87	}
88	}
89	return false;
90	}
91
92	/// Checks a parameter list for inclusion of polymorphic parameters; will substitute according to env if present
93	bool includesPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
94	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
95	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
96	assertf(paramType, "Aggregate parameters should be type expressions");
97	if ( includesPolyType( paramType->get_type(), env ) ) return true;
98	}
99	return false;
100	}
101
102	/// Checks a parameter list for inclusion of polymorphic parameters from tyVars; will substitute according to env if present
103	bool includesPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
104	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
105	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
106	assertf(paramType, "Aggregate parameters should be type expressions");
107	if ( includesPolyType( paramType->get_type(), tyVars, env ) ) return true;
108	}
109	return false;
110	}
111	}
112
113	Type* replaceTypeInst( Type* type, const TypeSubstitution* env ) {
114	if ( ! env ) return type;
115	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
116	Type *newType = env->lookup( typeInst->get_name() );
117	if ( newType ) return newType;
118	}
119	return type;
120	}
121
122	const Type* replaceTypeInst( const Type* type, const TypeSubstitution* env ) {
123	if ( ! env ) return type;
124	if ( auto typeInst = dynamic_cast< const TypeInstType* >( type ) ) {
125	Type *newType = env->lookup( typeInst->get_name() );
126	if ( newType ) return newType;
127	}
128	return type;
129	}
130
131	const ast::Type * replaceTypeInst(const ast::Type * type, const ast::TypeSubstitution * env) {
132	if (!env) return type;
133	if ( auto typeInst = dynamic_cast<const ast::TypeInstType*>(type) ) {
134	auto newType = env->lookup(typeInst);
135	if (newType) return newType;
136	}
137	return type;
138	}
139
140	Type isPolyType( Type type, const TypeSubstitution *env ) {
141	type = replaceTypeInst( type, env );
142
143	if ( dynamic_cast< TypeInstType * >( type ) ) {
144	return type;
145	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
146	return isPolyType( arrayType->base, env );
147	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
148	if ( hasPolyParams( structType->get_parameters(), env ) ) return type;
149	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
150	if ( hasPolyParams( unionType->get_parameters(), env ) ) return type;
151	}
152	return 0;
153	}
154
155	const ast::Type * isPolyType(const ast::Type * type, const ast::TypeSubstitution * env) {
156	type = replaceTypeInst( type, env );
157
158	if ( dynamic_cast< const ast::TypeInstType * >( type ) ) {
159	return type;
160	} else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
161	return isPolyType( arrayType->base, env );
162	} else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
163	if ( hasPolyParams( structType->params, env ) ) return type;
164	} else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
165	if ( hasPolyParams( unionType->params, env ) ) return type;
166	}
167	return 0;
168	}
169
170	Type isPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
171	type = replaceTypeInst( type, env );
172
173	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
174	if ( tyVars.find( typeInst->get_name() ) != tyVars.end() ) {
175	return type;
176	}
177	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
178	return isPolyType( arrayType->base, tyVars, env );
179	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
180	if ( hasPolyParams( structType->get_parameters(), tyVars, env ) ) return type;
181	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
182	if ( hasPolyParams( unionType->get_parameters(), tyVars, env ) ) return type;
183	}
184	return 0;
185	}
186
187	const ast::Type * isPolyType(const ast::Type * type, const TyVarMap & tyVars, const ast::TypeSubstitution * env) {
188	type = replaceTypeInst( type, env );
189
190	if ( auto typeInst = dynamic_cast< const ast::TypeInstType * >( type ) ) {
191	return tyVars.find(typeInst->typeString()) != tyVars.end() ? type : nullptr;
192	} else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
193	return isPolyType( arrayType->base, env );
194	} else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
195	if ( hasPolyParams( structType->params, env ) ) return type;
196	} else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
197	if ( hasPolyParams( unionType->params, env ) ) return type;
198	}
199	return nullptr;
200	}
201
202	const ast::Type * isPolyType( const ast::Type * type,
203	const TypeVarMap & typeVars, const ast::TypeSubstitution * subst ) {
204	type = replaceTypeInst( type, subst );
205
206	if ( auto inst = dynamic_cast< const ast::TypeInstType * >( type ) ) {
207	if ( typeVars.find( *inst ) != typeVars.end() ) return type;
208	} else if ( auto array = dynamic_cast< const ast::ArrayType * >( type ) ) {
209	return isPolyType( array->base, subst );
210	} else if ( auto sue = dynamic_cast< const ast::StructInstType * >( type ) ) {
211	if ( hasPolyParams( sue->params, subst ) ) return type;
212	} else if ( auto sue = dynamic_cast< const ast::UnionInstType * >( type ) ) {
213	if ( hasPolyParams( sue->params, subst ) ) return type;
214	}
215	return nullptr;
216	}
217
218	ReferenceToType isDynType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
219	type = replaceTypeInst( type, env );
220
221	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
222	auto var = tyVars.find( typeInst->get_name() );
223	if ( var != tyVars.end() && var->second.isComplete ) {
224	return typeInst;
225	}
226	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
227	if ( hasDynParams( structType->get_parameters(), tyVars, env ) ) return structType;
228	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
229	if ( hasDynParams( unionType->get_parameters(), tyVars, env ) ) return unionType;
230	}
231	return 0;
232	}
233
234	const ast::BaseInstType * isDynType(
235	const ast::Type * type, const TypeVarMap & typeVars,
236	const ast::TypeSubstitution * subst ) {
237	type = replaceTypeInst( type, subst );
238
239	if ( auto inst = dynamic_cast<ast::TypeInstType const *>( type ) ) {
240	auto var = typeVars.find( *inst );
241	if ( var != typeVars.end() && var->second.isComplete ) {
242	return inst;
243	}
244	} else if ( auto inst = dynamic_cast<ast::StructInstType const *>( type ) ) {
245	if ( hasDynParams( inst->params, typeVars, subst ) ) {
246	return inst;
247	}
248	} else if ( auto inst = dynamic_cast<ast::UnionInstType const *>( type ) ) {
249	if ( hasDynParams( inst->params, typeVars, subst ) ) {
250	return inst;
251	}
252	}
253	return nullptr;
254	}
255
256	ReferenceToType isDynRet( FunctionType function, const TyVarMap &forallTypes ) {
257	if ( function->get_returnVals().empty() ) return 0;
258
259	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
260	}
261
262	const ast::BaseInstType *isDynRet(
263	const ast::FunctionType * type, const TypeVarMap & typeVars ) {
264	if ( type->returns.empty() ) return nullptr;
265
266	return isDynType( type->returns.front(), typeVars );
267	}
268
269	ReferenceToType isDynRet( FunctionType function ) {
270	if ( function->get_returnVals().empty() ) return 0;
271
272	TyVarMap forallTypes( TypeDecl::Data{} );
273	makeTyVarMap( function, forallTypes );
274	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
275	}
276
277	bool needsAdapter( FunctionType *adaptee, const TyVarMap &tyVars ) {
278	// if ( ! adaptee->get_returnVals().empty() && isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
279	// return true;
280	// } // if
281	if ( isDynRet( adaptee, tyVars ) ) return true;
282
283	for ( std::list< DeclarationWithType* >::const_iterator innerArg = adaptee->get_parameters().begin(); innerArg != adaptee->get_parameters().end(); ++innerArg ) {
284	// if ( isPolyType( (*innerArg)->get_type(), tyVars ) ) {
285	if ( isDynType( (*innerArg)->get_type(), tyVars ) ) {
286	return true;
287	} // if
288	} // for
289	return false;
290	}
291
292	bool needsAdapter(
293	ast::FunctionType const * adaptee, const TypeVarMap & typeVars ) {
294	if ( isDynRet( adaptee, typeVars ) ) return true;
295
296	for ( auto param : adaptee->params ) {
297	if ( isDynType( param, typeVars ) ) {
298	return true;
299	}
300	}
301	return false;
302	}
303
304	Type isPolyPtr( Type type, const TypeSubstitution *env ) {
305	type = replaceTypeInst( type, env );
306
307	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
308	return isPolyType( ptr->get_base(), env );
309	}
310	return 0;
311	}
312
313	Type isPolyPtr( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
314	type = replaceTypeInst( type, env );
315
316	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
317	return isPolyType( ptr->get_base(), tyVars, env );
318	}
319	return 0;
320	}
321
322	Type * hasPolyBase( Type type, int levels, const TypeSubstitution *env ) {
323	int dummy;
324	if ( ! levels ) { levels = &dummy; }
325	*levels = 0;
326
327	while ( true ) {
328	type = replaceTypeInst( type, env );
329
330	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
331	type = ptr->get_base();
332	++(*levels);
333	} else break;
334	}
335
336	return isPolyType( type, env );
337	}
338
339	Type * hasPolyBase( Type type, const TyVarMap &tyVars, int levels, const TypeSubstitution *env ) {
340	int dummy;
341	if ( ! levels ) { levels = &dummy; }
342	*levels = 0;
343
344	while ( true ) {
345	type = replaceTypeInst( type, env );
346
347	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
348	type = ptr->get_base();
349	++(*levels);
350	} else break;
351	}
352
353	return isPolyType( type, tyVars, env );
354	}
355
356	ast::Type const * hasPolyBase(
357	ast::Type const * type, const TypeVarMap & typeVars,
358	int * levels, const ast::TypeSubstitution * subst ) {
359	int level_count = 0;
360
361	while ( true ) {
362	type = replaceTypeInst( type, subst );
363
364	if ( auto ptr = dynamic_cast<ast::PointerType const *>( type ) ) {
365	type = ptr->base;
366	++level_count;
367	} else {
368	break;
369	}
370	}
371
372	if ( nullptr != levels ) { *levels = level_count; }
373	return isPolyType( type, typeVars, subst );
374	}
375
376	bool includesPolyType( Type type, const TypeSubstitution env ) {
377	type = replaceTypeInst( type, env );
378
379	if ( dynamic_cast< TypeInstType * >( type ) ) {
380	return true;
381	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
382	if ( includesPolyType( pointerType->get_base(), env ) ) return true;
383	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
384	if ( includesPolyParams( structType->get_parameters(), env ) ) return true;
385	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
386	if ( includesPolyParams( unionType->get_parameters(), env ) ) return true;
387	}
388	return false;
389	}
390
391	bool includesPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution env ) {
392	type = replaceTypeInst( type, env );
393
394	if ( TypeInstType typeInstType = dynamic_cast< TypeInstType >( type ) ) {
395	if ( tyVars.find( typeInstType->get_name() ) != tyVars.end() ) {
396	return true;
397	}
398	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
399	if ( includesPolyType( pointerType->get_base(), tyVars, env ) ) return true;
400	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
401	if ( includesPolyParams( structType->get_parameters(), tyVars, env ) ) return true;
402	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
403	if ( includesPolyParams( unionType->get_parameters(), tyVars, env ) ) return true;
404	}
405	return false;
406	}
407
408	FunctionType * getFunctionType( Type *ty ) {
409	PointerType *ptrType;
410	if ( ( ptrType = dynamic_cast< PointerType* >( ty ) ) ) {
411	return dynamic_cast< FunctionType* >( ptrType->get_base() ); // pointer if FunctionType, NULL otherwise
412	} else {
413	return dynamic_cast< FunctionType* >( ty ); // pointer if FunctionType, NULL otherwise
414	}
415	}
416
417	const ast::FunctionType * getFunctionType( const ast::Type * ty ) {
418	if ( auto pty = dynamic_cast< const ast::PointerType * >( ty ) ) {
419	return pty->base.as< ast::FunctionType >();
420	} else {
421	return dynamic_cast< const ast::FunctionType * >( ty );
422	}
423	}
424
425	VariableExpr * getBaseVar( Expression expr, int levels ) {
426	int dummy;
427	if ( ! levels ) { levels = &dummy; }
428	*levels = 0;
429
430	while ( true ) {
431	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( expr ) ) {
432	return varExpr;
433	} else if ( MemberExpr memberExpr = dynamic_cast< MemberExpr >( expr ) ) {
434	expr = memberExpr->get_aggregate();
435	} else if ( AddressExpr addressExpr = dynamic_cast< AddressExpr >( expr ) ) {
436	expr = addressExpr->get_arg();
437	} else if ( UntypedExpr untypedExpr = dynamic_cast< UntypedExpr >( expr ) ) {
438	// look for compiler-inserted dereference operator
439	NameExpr fn = dynamic_cast< NameExpr >( untypedExpr->get_function() );
440	if ( ! fn \|\| fn->get_name() != std::string("*?") ) return 0;
441	expr = *untypedExpr->begin_args();
442	} else if ( CommaExpr commaExpr = dynamic_cast< CommaExpr >( expr ) ) {
443	// copy constructors insert comma exprs, look at second argument which contains the variable
444	expr = commaExpr->get_arg2();
445	continue;
446	} else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( expr ) ) {
447	int lvl1;
448	int lvl2;
449	VariableExpr * var1 = getBaseVar( condExpr->get_arg2(), &lvl1 );
450	VariableExpr * var2 = getBaseVar( condExpr->get_arg3(), &lvl2 );
451	if ( lvl1 == lvl2 && var1 && var2 && var1->get_var() == var2->get_var() ) {
452	*levels = lvl1;
453	return var1;
454	}
455	break;
456	} else break;
457
458	++(*levels);
459	}
460
461	return 0;
462	}
463
464	namespace {
465	/// Checks if is a pointer to D
466	template<typename D, typename B>
467	bool is( const B* p ) { return type_index{typeid(D)} == type_index{typeid(*p)}; }
468
469	/// Converts to a pointer to D without checking for safety
470	template<typename D, typename B>
471	inline D* as( B* p ) { return reinterpret_cast<D*>(p); }
472
473	template<typename D, typename B>
474	inline D const * as( B const * p ) {
475	return reinterpret_cast<D const *>( p );
476	}
477
478	/// Flattens a declaration list
479	template<typename Output>
480	void flattenList( list< DeclarationWithType* > src, Output out ) {
481	for ( DeclarationWithType* decl : src ) {
482	ResolvExpr::flatten( decl->get_type(), out );
483	}
484	}
485
486	/// Flattens a list of types
487	template<typename Output>
488	void flattenList( list< Type* > src, Output out ) {
489	for ( Type* ty : src ) {
490	ResolvExpr::flatten( ty, out );
491	}
492	}
493
494	/// Flattens a list of types.
495	// There is another flattenList in Unify.
496	void flattenList( vector<ast::ptr<ast::Type>> const & src,
497	vector<ast::ptr<ast::Type>> & out ) {
498	for ( auto const & type : src ) {
499	ResolvExpr::flatten( type, out );
500	}
501	}
502
503	/// Checks if two lists of parameters are equal up to polymorphic substitution.
504	bool paramListsPolyCompatible( const list< Expression* >& aparams, const list< Expression* >& bparams ) {
505	if ( aparams.size() != bparams.size() ) return false;
506
507	for ( list< Expression* >::const_iterator at = aparams.begin(), bt = bparams.begin();
508	at != aparams.end(); ++at, ++bt ) {
509	TypeExpr aparam = dynamic_cast< TypeExpr >(*at);
510	assertf(aparam, "Aggregate parameters should be type expressions");
511	TypeExpr bparam = dynamic_cast< TypeExpr >(*bt);
512	assertf(bparam, "Aggregate parameters should be type expressions");
513
514	// xxx - might need to let VoidType be a wildcard here too; could have some voids
515	// stuffed in for dtype-statics.
516	// if ( is<VoidType>( aparam->get_type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
517	if ( ! typesPolyCompatible( aparam->get_type(), bparam->get_type() ) ) return false;
518	}
519
520	return true;
521	}
522
523	bool paramListsPolyCompatible(
524	std::vector<ast::ptr<ast::Expr>> const & lparams,
525	std::vector<ast::ptr<ast::Expr>> const & rparams ) {
526	if ( lparams.size() != rparams.size() ) {
527	return false;
528	}
529
530	for ( auto lparam = lparams.begin(), rparam = rparams.begin() ;
531	lparam != lparams.end() ; ++lparam, ++rparam ) {
532	ast::TypeExpr const * lexpr = lparam->as<ast::TypeExpr>();
533	assertf( lexpr, "Aggregate parameters should be type expressions" );
534	ast::TypeExpr const * rexpr = rparam->as<ast::TypeExpr>();
535	assertf( rexpr, "Aggregate parameters should be type expressions" );
536
537	// xxx - might need to let VoidType be a wildcard here too; could have some voids
538	// stuffed in for dtype-statics.
539	// if ( is<VoidType>( lexpr->type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
540	if ( !typesPolyCompatible( lexpr->type, rexpr->type ) ) {
541	return false;
542	}
543	}
544
545	return true;
546	}
547	}
548
549	bool typesPolyCompatible( Type a, Type b ) {
550	type_index aid{ typeid(*a) };
551	// polymorphic types always match
552	if ( aid == type_index{typeid(TypeInstType)} ) return true;
553
554	type_index bid{ typeid(*b) };
555	// polymorphic types always match
556	if ( bid == type_index{typeid(TypeInstType)} ) return true;
557
558	// can't match otherwise if different types
559	if ( aid != bid ) return false;
560
561	// recurse through type structure (conditions borrowed from Unify.cc)
562	if ( aid == type_index{typeid(BasicType)} ) {
563	return as<BasicType>(a)->get_kind() == as<BasicType>(b)->get_kind();
564	} else if ( aid == type_index{typeid(PointerType)} ) {
565	PointerType ap = as<PointerType>(a), bp = as<PointerType>(b);
566
567	// void pointers should match any other pointer type
568	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
569	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
570	} else if ( aid == type_index{typeid(ReferenceType)} ) {
571	ReferenceType ap = as<ReferenceType>(a), bp = as<ReferenceType>(b);
572	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
573	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
574	} else if ( aid == type_index{typeid(ArrayType)} ) {
575	ArrayType aa = as<ArrayType>(a), ba = as<ArrayType>(b);
576
577	if ( aa->get_isVarLen() ) {
578	if ( ! ba->get_isVarLen() ) return false;
579	} else {
580	if ( ba->get_isVarLen() ) return false;
581
582	ConstantExpr ad = dynamic_cast<ConstantExpr>( aa->get_dimension() );
583	ConstantExpr bd = dynamic_cast<ConstantExpr>( ba->get_dimension() );
584	if ( ad && bd
585	&& ad->get_constant()->get_value() != bd->get_constant()->get_value() )
586	return false;
587	}
588
589	return typesPolyCompatible( aa->get_base(), ba->get_base() );
590	} else if ( aid == type_index{typeid(FunctionType)} ) {
591	FunctionType af = as<FunctionType>(a), bf = as<FunctionType>(b);
592
593	vector<Type*> aparams, bparams;
594	flattenList( af->get_parameters(), back_inserter( aparams ) );
595	flattenList( bf->get_parameters(), back_inserter( bparams ) );
596	if ( aparams.size() != bparams.size() ) return false;
597
598	vector<Type*> areturns, breturns;
599	flattenList( af->get_returnVals(), back_inserter( areturns ) );
600	flattenList( bf->get_returnVals(), back_inserter( breturns ) );
601	if ( areturns.size() != breturns.size() ) return false;
602
603	for ( unsigned i = 0; i < aparams.size(); ++i ) {
604	if ( ! typesPolyCompatible( aparams[i], bparams[i] ) ) return false;
605	}
606	for ( unsigned i = 0; i < areturns.size(); ++i ) {
607	if ( ! typesPolyCompatible( areturns[i], breturns[i] ) ) return false;
608	}
609	return true;
610	} else if ( aid == type_index{typeid(StructInstType)} ) {
611	StructInstType aa = as<StructInstType>(a), ba = as<StructInstType>(b);
612
613	if ( aa->get_name() != ba->get_name() ) return false;
614	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
615	} else if ( aid == type_index{typeid(UnionInstType)} ) {
616	UnionInstType aa = as<UnionInstType>(a), ba = as<UnionInstType>(b);
617
618	if ( aa->get_name() != ba->get_name() ) return false;
619	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
620	} else if ( aid == type_index{typeid(EnumInstType)} ) {
621	return as<EnumInstType>(a)->get_name() == as<EnumInstType>(b)->get_name();
622	} else if ( aid == type_index{typeid(TraitInstType)} ) {
623	return as<TraitInstType>(a)->get_name() == as<TraitInstType>(b)->get_name();
624	} else if ( aid == type_index{typeid(TupleType)} ) {
625	TupleType at = as<TupleType>(a), bt = as<TupleType>(b);
626
627	vector<Type*> atypes, btypes;
628	flattenList( at->get_types(), back_inserter( atypes ) );
629	flattenList( bt->get_types(), back_inserter( btypes ) );
630	if ( atypes.size() != btypes.size() ) return false;
631
632	for ( unsigned i = 0; i < atypes.size(); ++i ) {
633	if ( ! typesPolyCompatible( atypes[i], btypes[i] ) ) return false;
634	}
635	return true;
636	} else return true; // VoidType, VarArgsType, ZeroType & OneType just need the same type
637	}
638
639	bool typesPolyCompatible( ast::Type const * lhs, ast::Type const * rhs ) {
640	type_index const lid = typeid(*lhs);
641
642	// Polymorphic types always match:
643	if ( type_index(typeid(ast::TypeInstType)) == lid ) return true;
644
645	type_index const rid = typeid(*rhs);
646	if ( type_index(typeid(ast::TypeInstType)) == rid ) return true;
647
648	// All other types only match if they are the same type:
649	if ( lid != rid ) return false;
650
651	// So remaining types can be examined case by case.
652	// Recurse through type structure (conditions borrowed from Unify.cc).
653
654	if ( type_index(typeid(ast::BasicType)) == lid ) {
655	return as<ast::BasicType>(lhs)->kind == as<ast::BasicType>(rhs)->kind;
656	} else if ( type_index(typeid(ast::PointerType)) == lid ) {
657	ast::PointerType const * l = as<ast::PointerType>(lhs);
658	ast::PointerType const * r = as<ast::PointerType>(rhs);
659
660	// void pointers should match any other pointer type.
661	return is<ast::VoidType>( l->base.get() )
662	\|\| is<ast::VoidType>( r->base.get() )
663	\|\| typesPolyCompatible( l->base.get(), r->base.get() );
664	} else if ( type_index(typeid(ast::ReferenceType)) == lid ) {
665	ast::ReferenceType const * l = as<ast::ReferenceType>(lhs);
666	ast::ReferenceType const * r = as<ast::ReferenceType>(rhs);
667
668	// void references should match any other reference type.
669	return is<ast::VoidType>( l->base.get() )
670	\|\| is<ast::VoidType>( r->base.get() )
671	\|\| typesPolyCompatible( l->base.get(), r->base.get() );
672	} else if ( type_index(typeid(ast::ArrayType)) == lid ) {
673	ast::ArrayType const * l = as<ast::ArrayType>(lhs);
674	ast::ArrayType const * r = as<ast::ArrayType>(rhs);
675
676	if ( l->isVarLen ) {
677	if ( !r->isVarLen ) return false;
678	} else {
679	if ( r->isVarLen ) return false;
680
681	auto lc = l->dimension.as<ast::ConstantExpr>();
682	auto rc = r->dimension.as<ast::ConstantExpr>();
683	if ( lc && rc && lc->intValue() != rc->intValue() ) {
684	return false;
685	}
686	}
687
688	return typesPolyCompatible( l->base.get(), r->base.get() );
689	} else if ( type_index(typeid(ast::FunctionType)) == lid ) {
690	ast::FunctionType const * l = as<ast::FunctionType>(lhs);
691	ast::FunctionType const * r = as<ast::FunctionType>(rhs);
692
693	std::vector<ast::ptr<ast::Type>> lparams, rparams;
694	flattenList( l->params, lparams );
695	flattenList( r->params, rparams );
696	if ( lparams.size() != rparams.size() ) return false;
697	for ( unsigned i = 0; i < lparams.size(); ++i ) {
698	if ( !typesPolyCompatible( lparams[i], rparams[i] ) ) return false;
699	}
700
701	std::vector<ast::ptr<ast::Type>> lrets, rrets;
702	flattenList( l->returns, lrets );
703	flattenList( r->returns, rrets );
704	if ( lrets.size() != rrets.size() ) return false;
705	for ( unsigned i = 0; i < lrets.size(); ++i ) {
706	if ( !typesPolyCompatible( lrets[i], rrets[i] ) ) return false;
707	}
708	return true;
709	} else if ( type_index(typeid(ast::StructInstType)) == lid ) {
710	ast::StructInstType const * l = as<ast::StructInstType>(lhs);
711	ast::StructInstType const * r = as<ast::StructInstType>(rhs);
712
713	if ( l->name != r->name ) return false;
714	return paramListsPolyCompatible( l->params, r->params );
715	} else if ( type_index(typeid(ast::UnionInstType)) == lid ) {
716	ast::UnionInstType const * l = as<ast::UnionInstType>(lhs);
717	ast::UnionInstType const * r = as<ast::UnionInstType>(rhs);
718
719	if ( l->name != r->name ) return false;
720	return paramListsPolyCompatible( l->params, r->params );
721	} else if ( type_index(typeid(ast::EnumInstType)) == lid ) {
722	ast::EnumInstType const * l = as<ast::EnumInstType>(lhs);
723	ast::EnumInstType const * r = as<ast::EnumInstType>(rhs);
724
725	return l->name == r->name;
726	} else if ( type_index(typeid(ast::TraitInstType)) == lid ) {
727	ast::TraitInstType const * l = as<ast::TraitInstType>(lhs);
728	ast::TraitInstType const * r = as<ast::TraitInstType>(rhs);
729
730	return l->name == r->name;
731	} else if ( type_index(typeid(ast::TupleType)) == lid ) {
732	ast::TupleType const * l = as<ast::TupleType>(lhs);
733	ast::TupleType const * r = as<ast::TupleType>(rhs);
734
735	std::vector<ast::ptr<ast::Type>> ltypes, rtypes;
736	flattenList( l->types, ( ltypes ) );
737	flattenList( r->types, ( rtypes ) );
738	if ( ltypes.size() != rtypes.size() ) return false;
739
740	for ( unsigned i = 0 ; i < ltypes.size() ; ++i ) {
741	if ( !typesPolyCompatible( ltypes[i], rtypes[i] ) ) return false;
742	}
743	return true;
744	// The remaining types (VoidType, VarArgsType, ZeroType & OneType)
745	// have no variation so will always be equal.
746	} else {
747	return true;
748	}
749	}
750
751	bool needsBoxing( Type * param, Type * arg, const TyVarMap &exprTyVars, const TypeSubstitution * env ) {
752	// is parameter is not polymorphic, don't need to box
753	if ( ! isPolyType( param, exprTyVars ) ) return false;
754	Type * newType = arg->clone();
755	if ( env ) env->apply( newType );
756	std::unique_ptr<Type> manager( newType );
757	// if the argument's type is polymorphic, we don't need to box again!
758	return ! isPolyType( newType );
759	}
760
761	bool needsBoxing( const ast::Type * param, const ast::Type * arg,
762	const TypeVarMap & typeVars, const ast::TypeSubstitution * subst ) {
763	// Don't need to box if the parameter is not polymorphic.
764	if ( !isPolyType( param, typeVars ) ) return false;
765
766	ast::ptr<ast::Type> newType = arg;
767	if ( subst ) {
768	int count = subst->apply( newType );
769	(void)count;
770	}
771	// Only need to box if the argument is not also polymorphic.
772	return !isPolyType( newType );
773	}
774
775	bool needsBoxing( Type * param, Type * arg, ApplicationExpr * appExpr, const TypeSubstitution * env ) {
776	FunctionType * function = getFunctionType( appExpr->function->result );
777	assertf( function, "ApplicationExpr has non-function type: %s", toString( appExpr->function->result ).c_str() );
778	TyVarMap exprTyVars( TypeDecl::Data{} );
779	makeTyVarMap( function, exprTyVars );
780	return needsBoxing( param, arg, exprTyVars, env );
781	}
782
783	bool needsBoxing(
784	const ast::Type * param, const ast::Type * arg,
785	const ast::ApplicationExpr * expr,
786	const ast::TypeSubstitution * subst ) {
787	const ast::FunctionType * function = getFunctionType( expr->func->result );
788	assertf( function, "ApplicationExpr has non-function type: %s", toString( expr->func->result ).c_str() );
789	TypeVarMap exprTyVars = { ast::TypeData() };
790	makeTypeVarMap( function, exprTyVars );
791	return needsBoxing( param, arg, exprTyVars, subst );
792	}
793
794	void addToTyVarMap( TypeDecl * tyVar, TyVarMap &tyVarMap ) {
795	tyVarMap.insert( tyVar->name, TypeDecl::Data{ tyVar } );
796	}
797
798	void addToTypeVarMap( const ast::TypeInstType * type, TypeVarMap & typeVars ) {
799	typeVars.insert( *type, ast::TypeData( type->base ) );
800	}
801
802	void makeTyVarMap( Type *type, TyVarMap &tyVarMap ) {
803	for ( Type::ForallList::const_iterator tyVar = type->get_forall().begin(); tyVar != type->get_forall().end(); ++tyVar ) {
804	assert( *tyVar );
805	addToTyVarMap( *tyVar, tyVarMap );
806	}
807	if ( PointerType pointer = dynamic_cast< PointerType >( type ) ) {
808	makeTyVarMap( pointer->get_base(), tyVarMap );
809	}
810	}
811
812	void makeTypeVarMap( const ast::Type * type, TypeVarMap & typeVars ) {
813	if ( auto func = dynamic_cast<ast::FunctionType const *>( type ) ) {
814	for ( auto & typeVar : func->forall ) {
815	assert( typeVar );
816	addToTypeVarMap( typeVar, typeVars );
817	}
818	}
819	if ( auto pointer = dynamic_cast<ast::PointerType const *>( type ) ) {
820	makeTypeVarMap( pointer->base, typeVars );
821	}
822	}
823
824	void printTyVarMap( std::ostream &os, const TyVarMap &tyVarMap ) {
825	for ( TyVarMap::const_iterator i = tyVarMap.begin(); i != tyVarMap.end(); ++i ) {
826	os << i->first << " (" << i->second << ") ";
827	} // for
828	os << std::endl;
829	}
830
831	} // namespace GenPoly
832
833	// Local Variables: //
834	// tab-width: 4 //
835	// mode: c++ //
836	// compile-command: "make install" //
837	// End: //

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