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source: src/GenPoly/GenPoly.cc @ 7de2affc

ADTast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since 7de2affc was 3e5dd913, checked in by Fangren Yu <f37yu@…>, 4 years ago
reimplement function type and eliminate deep copy
Property mode set to `100644`
File size: 23.5 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 : Peter A. Buhr
12	// Last Modified On : Wed Jun 29 21:45:53 2016
13	// Update Count : 14
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/Type.hpp"
27	#include "GenPoly/ErasableScopedMap.h" // for ErasableScopedMap<>::const_it...
28	#include "ResolvExpr/typeops.h" // for flatten
29	#include "SynTree/Constant.h" // for Constant
30	#include "SynTree/Expression.h" // for Expression, TypeExpr, Constan...
31	#include "SynTree/Type.h" // for Type, StructInstType, UnionIn...
32	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
33
34	using namespace std;
35
36	namespace GenPoly {
37	namespace {
38	/// Checks a parameter list for polymorphic parameters; will substitute according to env if present
39	bool hasPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
40	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
41	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
42	assertf(paramType, "Aggregate parameters should be type expressions");
43	if ( isPolyType( paramType->get_type(), env ) ) return true;
44	}
45	return false;
46	}
47
48	bool hasPolyParams( const std::vector<ast::ptr<ast::Expr>> & params, const ast::TypeSubstitution * env) {
49	for (auto &param : params) {
50	auto paramType = param.strict_as<ast::TypeExpr>();
51	if (isPolyType(paramType->type, env)) return true;
52	}
53	return false;
54	}
55
56	/// Checks a parameter list for polymorphic parameters from tyVars; will substitute according to env if present
57	bool hasPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
58	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
59	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
60	assertf(paramType, "Aggregate parameters should be type expressions");
61	if ( isPolyType( paramType->get_type(), tyVars, env ) ) return true;
62	}
63	return false;
64	}
65
66	bool hasPolyParams( const std::vector<ast::ptr<ast::Expr>> & params, const TyVarMap & tyVars, const ast::TypeSubstitution * env) {
67	for (auto &param : params) {
68	auto paramType = param.strict_as<ast::TypeExpr>();
69	if (isPolyType(paramType->type, tyVars, env)) return true;
70	}
71	return false;
72	}
73
74	/// Checks a parameter list for dynamic-layout parameters from tyVars; will substitute according to env if present
75	bool hasDynParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
76	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
77	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
78	assertf(paramType, "Aggregate parameters should be type expressions");
79	if ( isDynType( paramType->get_type(), tyVars, env ) ) return true;
80	}
81	return false;
82	}
83
84	/// Checks a parameter list for inclusion of polymorphic parameters; will substitute according to env if present
85	bool includesPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
86	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
87	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
88	assertf(paramType, "Aggregate parameters should be type expressions");
89	if ( includesPolyType( paramType->get_type(), env ) ) return true;
90	}
91	return false;
92	}
93
94	/// Checks a parameter list for inclusion of polymorphic parameters from tyVars; will substitute according to env if present
95	bool includesPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
96	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
97	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
98	assertf(paramType, "Aggregate parameters should be type expressions");
99	if ( includesPolyType( paramType->get_type(), tyVars, env ) ) return true;
100	}
101	return false;
102	}
103	}
104
105	Type* replaceTypeInst( Type* type, const TypeSubstitution* env ) {
106	if ( ! env ) return type;
107	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
108	Type *newType = env->lookup( typeInst->get_name() );
109	if ( newType ) return newType;
110	}
111	return type;
112	}
113
114	const ast::Type * replaceTypeInst(const ast::Type * type, const ast::TypeSubstitution * env) {
115	if (!env) return type;
116	if (auto typeInst = dynamic_cast<const ast::TypeInstType*> (type)) {
117	auto newType = env->lookup(typeInst);
118	if (newType) return newType;
119	}
120	return type;
121	}
122
123	Type isPolyType( Type type, const TypeSubstitution *env ) {
124	type = replaceTypeInst( type, env );
125
126	if ( dynamic_cast< TypeInstType * >( type ) ) {
127	return type;
128	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
129	return isPolyType( arrayType->base, env );
130	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
131	if ( hasPolyParams( structType->get_parameters(), env ) ) return type;
132	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
133	if ( hasPolyParams( unionType->get_parameters(), env ) ) return type;
134	}
135	return 0;
136	}
137
138	const ast::Type * isPolyType(const ast::Type * type, const ast::TypeSubstitution * env) {
139	type = replaceTypeInst( type, env );
140
141	if ( dynamic_cast< const ast::TypeInstType * >( type ) ) {
142	return type;
143	} else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
144	return isPolyType( arrayType->base, env );
145	} else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
146	if ( hasPolyParams( structType->params, env ) ) return type;
147	} else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
148	if ( hasPolyParams( unionType->params, env ) ) return type;
149	}
150	return 0;
151	}
152
153	Type isPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
154	type = replaceTypeInst( type, env );
155
156	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
157	if ( tyVars.find( typeInst->get_name() ) != tyVars.end() ) {
158	return type;
159	}
160	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
161	return isPolyType( arrayType->base, tyVars, env );
162	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
163	if ( hasPolyParams( structType->get_parameters(), tyVars, env ) ) return type;
164	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
165	if ( hasPolyParams( unionType->get_parameters(), tyVars, env ) ) return type;
166	}
167	return 0;
168	}
169
170	const ast::Type * isPolyType(const ast::Type * type, const TyVarMap & tyVars, const ast::TypeSubstitution * env) {
171	type = replaceTypeInst( type, env );
172
173	if ( auto typeInst = dynamic_cast< const ast::TypeInstType * >( type ) ) {
174	return tyVars.find(typeInst->typeString()) != tyVars.end() ? type : nullptr;
175	} else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
176	return isPolyType( arrayType->base, env );
177	} else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
178	if ( hasPolyParams( structType->params, env ) ) return type;
179	} else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
180	if ( hasPolyParams( unionType->params, env ) ) return type;
181	}
182	return nullptr;
183	}
184
185	ReferenceToType isDynType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
186	type = replaceTypeInst( type, env );
187
188	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
189	auto var = tyVars.find( typeInst->get_name() );
190	if ( var != tyVars.end() && var->second.isComplete ) {
191	return typeInst;
192	}
193	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
194	if ( hasDynParams( structType->get_parameters(), tyVars, env ) ) return structType;
195	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
196	if ( hasDynParams( unionType->get_parameters(), tyVars, env ) ) return unionType;
197	}
198	return 0;
199	}
200
201	ReferenceToType isDynRet( FunctionType function, const TyVarMap &forallTypes ) {
202	if ( function->get_returnVals().empty() ) return 0;
203
204	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
205	}
206
207	ReferenceToType isDynRet( FunctionType function ) {
208	if ( function->get_returnVals().empty() ) return 0;
209
210	TyVarMap forallTypes( TypeDecl::Data{} );
211	makeTyVarMap( function, forallTypes );
212	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
213	}
214
215	bool needsAdapter( FunctionType *adaptee, const TyVarMap &tyVars ) {
216	// if ( ! adaptee->get_returnVals().empty() && isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
217	// return true;
218	// } // if
219	if ( isDynRet( adaptee, tyVars ) ) return true;
220
221	for ( std::list< DeclarationWithType* >::const_iterator innerArg = adaptee->get_parameters().begin(); innerArg != adaptee->get_parameters().end(); ++innerArg ) {
222	// if ( isPolyType( (*innerArg)->get_type(), tyVars ) ) {
223	if ( isDynType( (*innerArg)->get_type(), tyVars ) ) {
224	return true;
225	} // if
226	} // for
227	return false;
228	}
229
230	Type isPolyPtr( Type type, const TypeSubstitution *env ) {
231	type = replaceTypeInst( type, env );
232
233	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
234	return isPolyType( ptr->get_base(), env );
235	}
236	return 0;
237	}
238
239	Type isPolyPtr( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
240	type = replaceTypeInst( type, env );
241
242	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
243	return isPolyType( ptr->get_base(), tyVars, env );
244	}
245	return 0;
246	}
247
248	Type * hasPolyBase( Type type, int levels, const TypeSubstitution *env ) {
249	int dummy;
250	if ( ! levels ) { levels = &dummy; }
251	*levels = 0;
252
253	while ( true ) {
254	type = replaceTypeInst( type, env );
255
256	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
257	type = ptr->get_base();
258	++(*levels);
259	} else break;
260	}
261
262	return isPolyType( type, env );
263	}
264
265	Type * hasPolyBase( Type type, const TyVarMap &tyVars, int levels, const TypeSubstitution *env ) {
266	int dummy;
267	if ( ! levels ) { levels = &dummy; }
268	*levels = 0;
269
270	while ( true ) {
271	type = replaceTypeInst( type, env );
272
273	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
274	type = ptr->get_base();
275	++(*levels);
276	} else break;
277	}
278
279	return isPolyType( type, tyVars, env );
280	}
281
282	bool includesPolyType( Type type, const TypeSubstitution env ) {
283	type = replaceTypeInst( type, env );
284
285	if ( dynamic_cast< TypeInstType * >( type ) ) {
286	return true;
287	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
288	if ( includesPolyType( pointerType->get_base(), env ) ) return true;
289	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
290	if ( includesPolyParams( structType->get_parameters(), env ) ) return true;
291	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
292	if ( includesPolyParams( unionType->get_parameters(), env ) ) return true;
293	}
294	return false;
295	}
296
297	bool includesPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution env ) {
298	type = replaceTypeInst( type, env );
299
300	if ( TypeInstType typeInstType = dynamic_cast< TypeInstType >( type ) ) {
301	if ( tyVars.find( typeInstType->get_name() ) != tyVars.end() ) {
302	return true;
303	}
304	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
305	if ( includesPolyType( pointerType->get_base(), tyVars, env ) ) return true;
306	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
307	if ( includesPolyParams( structType->get_parameters(), tyVars, env ) ) return true;
308	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
309	if ( includesPolyParams( unionType->get_parameters(), tyVars, env ) ) return true;
310	}
311	return false;
312	}
313
314	FunctionType * getFunctionType( Type *ty ) {
315	PointerType *ptrType;
316	if ( ( ptrType = dynamic_cast< PointerType* >( ty ) ) ) {
317	return dynamic_cast< FunctionType* >( ptrType->get_base() ); // pointer if FunctionType, NULL otherwise
318	} else {
319	return dynamic_cast< FunctionType* >( ty ); // pointer if FunctionType, NULL otherwise
320	}
321	}
322
323	const ast::FunctionType * getFunctionType( const ast::Type * ty ) {
324	if ( auto pty = dynamic_cast< const ast::PointerType * >( ty ) ) {
325	return pty->base.as< ast::FunctionType >();
326	} else {
327	return dynamic_cast< const ast::FunctionType * >( ty );
328	}
329	}
330
331	VariableExpr * getBaseVar( Expression expr, int levels ) {
332	int dummy;
333	if ( ! levels ) { levels = &dummy; }
334	*levels = 0;
335
336	while ( true ) {
337	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( expr ) ) {
338	return varExpr;
339	} else if ( MemberExpr memberExpr = dynamic_cast< MemberExpr >( expr ) ) {
340	expr = memberExpr->get_aggregate();
341	} else if ( AddressExpr addressExpr = dynamic_cast< AddressExpr >( expr ) ) {
342	expr = addressExpr->get_arg();
343	} else if ( UntypedExpr untypedExpr = dynamic_cast< UntypedExpr >( expr ) ) {
344	// look for compiler-inserted dereference operator
345	NameExpr fn = dynamic_cast< NameExpr >( untypedExpr->get_function() );
346	if ( ! fn \|\| fn->get_name() != std::string("*?") ) return 0;
347	expr = *untypedExpr->begin_args();
348	} else if ( CommaExpr commaExpr = dynamic_cast< CommaExpr >( expr ) ) {
349	// copy constructors insert comma exprs, look at second argument which contains the variable
350	expr = commaExpr->get_arg2();
351	continue;
352	} else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( expr ) ) {
353	int lvl1;
354	int lvl2;
355	VariableExpr * var1 = getBaseVar( condExpr->get_arg2(), &lvl1 );
356	VariableExpr * var2 = getBaseVar( condExpr->get_arg3(), &lvl2 );
357	if ( lvl1 == lvl2 && var1 && var2 && var1->get_var() == var2->get_var() ) {
358	*levels = lvl1;
359	return var1;
360	}
361	break;
362	} else break;
363
364	++(*levels);
365	}
366
367	return 0;
368	}
369
370	namespace {
371	/// Checks if is a pointer to D
372	template<typename D, typename B>
373	bool is( const B* p ) { return type_index{typeid(D)} == type_index{typeid(*p)}; }
374
375	/// Converts to a pointer to D without checking for safety
376	template<typename D, typename B>
377	inline D* as( B* p ) { return reinterpret_cast<D*>(p); }
378
379	/// Flattens a declaration list
380	template<typename Output>
381	void flattenList( list< DeclarationWithType* > src, Output out ) {
382	for ( DeclarationWithType* decl : src ) {
383	ResolvExpr::flatten( decl->get_type(), out );
384	}
385	}
386
387	/// Flattens a list of types
388	template<typename Output>
389	void flattenList( list< Type* > src, Output out ) {
390	for ( Type* ty : src ) {
391	ResolvExpr::flatten( ty, out );
392	}
393	}
394
395	/// Checks if two lists of parameters are equal up to polymorphic substitution.
396	bool paramListsPolyCompatible( const list< Expression* >& aparams, const list< Expression* >& bparams ) {
397	if ( aparams.size() != bparams.size() ) return false;
398
399	for ( list< Expression* >::const_iterator at = aparams.begin(), bt = bparams.begin();
400	at != aparams.end(); ++at, ++bt ) {
401	TypeExpr aparam = dynamic_cast< TypeExpr >(*at);
402	assertf(aparam, "Aggregate parameters should be type expressions");
403	TypeExpr bparam = dynamic_cast< TypeExpr >(*bt);
404	assertf(bparam, "Aggregate parameters should be type expressions");
405
406	// xxx - might need to let VoidType be a wildcard here too; could have some voids
407	// stuffed in for dtype-statics.
408	// if ( is<VoidType>( aparam->get_type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
409	if ( ! typesPolyCompatible( aparam->get_type(), bparam->get_type() ) ) return false;
410	}
411
412	return true;
413	}
414	}
415
416	bool typesPolyCompatible( Type a, Type b ) {
417	type_index aid{ typeid(*a) };
418	// polymorphic types always match
419	if ( aid == type_index{typeid(TypeInstType)} ) return true;
420
421	type_index bid{ typeid(*b) };
422	// polymorphic types always match
423	if ( bid == type_index{typeid(TypeInstType)} ) return true;
424
425	// can't match otherwise if different types
426	if ( aid != bid ) return false;
427
428	// recurse through type structure (conditions borrowed from Unify.cc)
429	if ( aid == type_index{typeid(BasicType)} ) {
430	return as<BasicType>(a)->get_kind() == as<BasicType>(b)->get_kind();
431	} else if ( aid == type_index{typeid(PointerType)} ) {
432	PointerType ap = as<PointerType>(a), bp = as<PointerType>(b);
433
434	// void pointers should match any other pointer type
435	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
436	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
437	} else if ( aid == type_index{typeid(ReferenceType)} ) {
438	ReferenceType ap = as<ReferenceType>(a), bp = as<ReferenceType>(b);
439	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
440	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
441	} else if ( aid == type_index{typeid(ArrayType)} ) {
442	ArrayType aa = as<ArrayType>(a), ba = as<ArrayType>(b);
443
444	if ( aa->get_isVarLen() ) {
445	if ( ! ba->get_isVarLen() ) return false;
446	} else {
447	if ( ba->get_isVarLen() ) return false;
448
449	ConstantExpr ad = dynamic_cast<ConstantExpr>( aa->get_dimension() );
450	ConstantExpr bd = dynamic_cast<ConstantExpr>( ba->get_dimension() );
451	if ( ad && bd
452	&& ad->get_constant()->get_value() != bd->get_constant()->get_value() )
453	return false;
454	}
455
456	return typesPolyCompatible( aa->get_base(), ba->get_base() );
457	} else if ( aid == type_index{typeid(FunctionType)} ) {
458	FunctionType af = as<FunctionType>(a), bf = as<FunctionType>(b);
459
460	vector<Type*> aparams, bparams;
461	flattenList( af->get_parameters(), back_inserter( aparams ) );
462	flattenList( bf->get_parameters(), back_inserter( bparams ) );
463	if ( aparams.size() != bparams.size() ) return false;
464
465	vector<Type*> areturns, breturns;
466	flattenList( af->get_returnVals(), back_inserter( areturns ) );
467	flattenList( bf->get_returnVals(), back_inserter( breturns ) );
468	if ( areturns.size() != breturns.size() ) return false;
469
470	for ( unsigned i = 0; i < aparams.size(); ++i ) {
471	if ( ! typesPolyCompatible( aparams[i], bparams[i] ) ) return false;
472	}
473	for ( unsigned i = 0; i < areturns.size(); ++i ) {
474	if ( ! typesPolyCompatible( areturns[i], breturns[i] ) ) return false;
475	}
476	return true;
477	} else if ( aid == type_index{typeid(StructInstType)} ) {
478	StructInstType aa = as<StructInstType>(a), ba = as<StructInstType>(b);
479
480	if ( aa->get_name() != ba->get_name() ) return false;
481	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
482	} else if ( aid == type_index{typeid(UnionInstType)} ) {
483	UnionInstType aa = as<UnionInstType>(a), ba = as<UnionInstType>(b);
484
485	if ( aa->get_name() != ba->get_name() ) return false;
486	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
487	} else if ( aid == type_index{typeid(EnumInstType)} ) {
488	return as<EnumInstType>(a)->get_name() == as<EnumInstType>(b)->get_name();
489	} else if ( aid == type_index{typeid(TraitInstType)} ) {
490	return as<TraitInstType>(a)->get_name() == as<TraitInstType>(b)->get_name();
491	} else if ( aid == type_index{typeid(TupleType)} ) {
492	TupleType at = as<TupleType>(a), bt = as<TupleType>(b);
493
494	vector<Type*> atypes, btypes;
495	flattenList( at->get_types(), back_inserter( atypes ) );
496	flattenList( bt->get_types(), back_inserter( btypes ) );
497	if ( atypes.size() != btypes.size() ) return false;
498
499	for ( unsigned i = 0; i < atypes.size(); ++i ) {
500	if ( ! typesPolyCompatible( atypes[i], btypes[i] ) ) return false;
501	}
502	return true;
503	} else return true; // VoidType, VarArgsType, ZeroType & OneType just need the same type
504	}
505
506	namespace {
507	// temporary hack to avoid re-implementing anything related to TyVarMap
508	// does this work? these two structs have identical definitions.
509	inline TypeDecl::Data convData(const ast::TypeDecl::Data & data) {
510	return reinterpret_cast<const TypeDecl::Data >(&data);
511	}
512	}
513
514	bool needsBoxing( Type * param, Type * arg, const TyVarMap &exprTyVars, const TypeSubstitution * env ) {
515	// is parameter is not polymorphic, don't need to box
516	if ( ! isPolyType( param, exprTyVars ) ) return false;
517	Type * newType = arg->clone();
518	if ( env ) env->apply( newType );
519	std::unique_ptr<Type> manager( newType );
520	// if the argument's type is polymorphic, we don't need to box again!
521	return ! isPolyType( newType );
522	}
523
524	bool needsBoxing( const ast::Type * param, const ast::Type * arg, const TyVarMap &exprTyVars, const ast::TypeSubstitution * env) {
525	// is parameter is not polymorphic, don't need to box
526	if ( ! isPolyType( param, exprTyVars ) ) return false;
527	ast::ptr<ast::Type> newType = arg;
528	if ( env ) env->apply( newType );
529	// if the argument's type is polymorphic, we don't need to box again!
530	return ! isPolyType( newType );
531	}
532
533	bool needsBoxing( Type * param, Type * arg, ApplicationExpr * appExpr, const TypeSubstitution * env ) {
534	FunctionType * function = getFunctionType( appExpr->function->result );
535	assertf( function, "ApplicationExpr has non-function type: %s", toString( appExpr->function->result ).c_str() );
536	TyVarMap exprTyVars( TypeDecl::Data{} );
537	makeTyVarMap( function, exprTyVars );
538	return needsBoxing( param, arg, exprTyVars, env );
539	}
540
541	bool needsBoxing( const ast::Type * param, const ast::Type * arg, const ast::ApplicationExpr * appExpr, const ast::TypeSubstitution * env) {
542	const ast::FunctionType * function = getFunctionType(appExpr->func->result);
543	assertf( function, "ApplicationExpr has non-function type: %s", toString( appExpr->func->result ).c_str() );
544	TyVarMap exprTyVars(TypeDecl::Data{});
545	makeTyVarMap(function, exprTyVars);
546	return needsBoxing(param, arg, exprTyVars, env);
547
548	}
549
550	void addToTyVarMap( TypeDecl * tyVar, TyVarMap &tyVarMap ) {
551	tyVarMap.insert( tyVar->name, TypeDecl::Data{ tyVar } );
552	}
553
554	void addToTyVarMap( const ast::TypeInstType * tyVar, TyVarMap & tyVarMap) {
555	tyVarMap.insert(tyVar->typeString(), convData(ast::TypeDecl::Data{tyVar->base}));
556	}
557
558	void makeTyVarMap( Type *type, TyVarMap &tyVarMap ) {
559	for ( Type::ForallList::const_iterator tyVar = type->get_forall().begin(); tyVar != type->get_forall().end(); ++tyVar ) {
560	assert( *tyVar );
561	addToTyVarMap( *tyVar, tyVarMap );
562	}
563	if ( PointerType pointer = dynamic_cast< PointerType >( type ) ) {
564	makeTyVarMap( pointer->get_base(), tyVarMap );
565	}
566	}
567
568	void makeTyVarMap(const ast::Type * type, TyVarMap & tyVarMap) {
569	if (auto ptype = dynamic_cast<const ast::FunctionType *>(type)) {
570	for (auto & tyVar : ptype->forall) {
571	assert (tyVar);
572	addToTyVarMap(tyVar, tyVarMap);
573	}
574	}
575	if (auto pointer = dynamic_cast<const ast::PointerType *>(type)) {
576	makeTyVarMap(pointer->base, tyVarMap);
577	}
578	}
579
580	void printTyVarMap( std::ostream &os, const TyVarMap &tyVarMap ) {
581	for ( TyVarMap::const_iterator i = tyVarMap.begin(); i != tyVarMap.end(); ++i ) {
582	os << i->first << " (" << i->second << ") ";
583	} // for
584	os << std::endl;
585	}
586
587	} // namespace GenPoly
588
589	// Local Variables: //
590	// tab-width: 4 //
591	// mode: c++ //
592	// compile-command: "make install" //
593	// End: //

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