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source: src/GenPoly/GenPoly.cc @ 68f9c43

new-envwith_gc

Last change on this file since 68f9c43 was ae1b9ea, checked in by Rob Schluntz <rschlunt@…>, 7 years ago
Always copy construct arguments that require boxing
Property mode set to `100644`
File size: 18.9 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 "GenPoly/ErasableScopedMap.h" // for ErasableScopedMap<>::const_it...
27	#include "ResolvExpr/typeops.h" // for flatten
28	#include "SynTree/Constant.h" // for Constant
29	#include "SynTree/Expression.h" // for Expression, TypeExpr, Constan...
30	#include "SynTree/Type.h" // for Type, StructInstType, UnionIn...
31	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
32
33	using namespace std;
34
35	namespace GenPoly {
36	namespace {
37	/// Checks a parameter list for polymorphic parameters; will substitute according to env if present
38	bool hasPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
39	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
40	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
41	assertf(paramType, "Aggregate parameters should be type expressions");
42	if ( isPolyType( paramType->get_type(), env ) ) return true;
43	}
44	return false;
45	}
46
47	/// Checks a parameter list for polymorphic parameters from tyVars; will substitute according to env if present
48	bool hasPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
49	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
50	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
51	assertf(paramType, "Aggregate parameters should be type expressions");
52	if ( isPolyType( paramType->get_type(), tyVars, env ) ) return true;
53	}
54	return false;
55	}
56
57	/// Checks a parameter list for dynamic-layout parameters from tyVars; will substitute according to env if present
58	bool hasDynParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
59	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
60	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
61	assertf(paramType, "Aggregate parameters should be type expressions");
62	if ( isDynType( paramType->get_type(), tyVars, env ) ) return true;
63	}
64	return false;
65	}
66
67	/// Checks a parameter list for inclusion of polymorphic parameters; will substitute according to env if present
68	bool includesPolyParams( std::list< Expression* >& params, const TypeSubstitution *env ) {
69	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
70	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
71	assertf(paramType, "Aggregate parameters should be type expressions");
72	if ( includesPolyType( paramType->get_type(), env ) ) return true;
73	}
74	return false;
75	}
76
77	/// Checks a parameter list for inclusion of polymorphic parameters from tyVars; will substitute according to env if present
78	bool includesPolyParams( std::list< Expression* >& params, const TyVarMap &tyVars, const TypeSubstitution *env ) {
79	for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
80	TypeExpr paramType = dynamic_cast< TypeExpr >( *param );
81	assertf(paramType, "Aggregate parameters should be type expressions");
82	if ( includesPolyType( paramType->get_type(), tyVars, env ) ) return true;
83	}
84	return false;
85	}
86	}
87
88	Type* replaceTypeInst( Type* type, const TypeSubstitution* env ) {
89	if ( ! env ) return type;
90	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
91	Type *newType = env->lookup( typeInst->get_name() );
92	if ( newType ) return newType;
93	}
94	return type;
95	}
96
97	Type isPolyType( Type type, const TypeSubstitution *env ) {
98	type = replaceTypeInst( type, env );
99
100	if ( dynamic_cast< TypeInstType * >( type ) ) {
101	return type;
102	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
103	if ( hasPolyParams( structType->get_parameters(), env ) ) return type;
104	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
105	if ( hasPolyParams( unionType->get_parameters(), env ) ) return type;
106	}
107	return 0;
108	}
109
110	Type isPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
111	type = replaceTypeInst( type, env );
112
113	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
114	if ( tyVars.find( typeInst->get_name() ) != tyVars.end() ) {
115	return type;
116	}
117	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
118	if ( hasPolyParams( structType->get_parameters(), tyVars, env ) ) return type;
119	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
120	if ( hasPolyParams( unionType->get_parameters(), tyVars, env ) ) return type;
121	}
122	return 0;
123	}
124
125	ReferenceToType isDynType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
126	type = replaceTypeInst( type, env );
127
128	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
129	auto var = tyVars.find( typeInst->get_name() );
130	if ( var != tyVars.end() && var->second.isComplete ) {
131	return typeInst;
132	}
133	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
134	if ( hasDynParams( structType->get_parameters(), tyVars, env ) ) return structType;
135	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
136	if ( hasDynParams( unionType->get_parameters(), tyVars, env ) ) return unionType;
137	}
138	return 0;
139	}
140
141	ReferenceToType isDynRet( FunctionType function, const TyVarMap &forallTypes ) {
142	if ( function->get_returnVals().empty() ) return 0;
143
144	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
145	}
146
147	ReferenceToType isDynRet( FunctionType function ) {
148	if ( function->get_returnVals().empty() ) return 0;
149
150	TyVarMap forallTypes( TypeDecl::Data{} );
151	makeTyVarMap( function, forallTypes );
152	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
153	}
154
155	bool needsAdapter( FunctionType *adaptee, const TyVarMap &tyVars ) {
156	// if ( ! adaptee->get_returnVals().empty() && isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
157	// return true;
158	// } // if
159	if ( isDynRet( adaptee, tyVars ) ) return true;
160
161	for ( std::list< DeclarationWithType* >::const_iterator innerArg = adaptee->get_parameters().begin(); innerArg != adaptee->get_parameters().end(); ++innerArg ) {
162	// if ( isPolyType( (*innerArg)->get_type(), tyVars ) ) {
163	if ( isDynType( (*innerArg)->get_type(), tyVars ) ) {
164	return true;
165	} // if
166	} // for
167	return false;
168	}
169
170	Type isPolyPtr( Type type, const TypeSubstitution *env ) {
171	type = replaceTypeInst( type, env );
172
173	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
174	return isPolyType( ptr->get_base(), env );
175	}
176	return 0;
177	}
178
179	Type isPolyPtr( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
180	type = replaceTypeInst( type, env );
181
182	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
183	return isPolyType( ptr->get_base(), tyVars, env );
184	}
185	return 0;
186	}
187
188	Type * hasPolyBase( Type type, int levels, const TypeSubstitution *env ) {
189	int dummy;
190	if ( ! levels ) { levels = &dummy; }
191	*levels = 0;
192
193	while ( true ) {
194	type = replaceTypeInst( type, env );
195
196	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
197	type = ptr->get_base();
198	++(*levels);
199	} else break;
200	}
201
202	return isPolyType( type, env );
203	}
204
205	Type * hasPolyBase( Type type, const TyVarMap &tyVars, int levels, const TypeSubstitution *env ) {
206	int dummy;
207	if ( ! levels ) { levels = &dummy; }
208	*levels = 0;
209
210	while ( true ) {
211	type = replaceTypeInst( type, env );
212
213	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
214	type = ptr->get_base();
215	++(*levels);
216	} else break;
217	}
218
219	return isPolyType( type, tyVars, env );
220	}
221
222	bool includesPolyType( Type type, const TypeSubstitution env ) {
223	type = replaceTypeInst( type, env );
224
225	if ( dynamic_cast< TypeInstType * >( type ) ) {
226	return true;
227	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
228	if ( includesPolyType( pointerType->get_base(), env ) ) return true;
229	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
230	if ( includesPolyParams( structType->get_parameters(), env ) ) return true;
231	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
232	if ( includesPolyParams( unionType->get_parameters(), env ) ) return true;
233	}
234	return false;
235	}
236
237	bool includesPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution env ) {
238	type = replaceTypeInst( type, env );
239
240	if ( TypeInstType typeInstType = dynamic_cast< TypeInstType >( type ) ) {
241	if ( tyVars.find( typeInstType->get_name() ) != tyVars.end() ) {
242	return true;
243	}
244	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
245	if ( includesPolyType( pointerType->get_base(), tyVars, env ) ) return true;
246	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
247	if ( includesPolyParams( structType->get_parameters(), tyVars, env ) ) return true;
248	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
249	if ( includesPolyParams( unionType->get_parameters(), tyVars, env ) ) return true;
250	}
251	return false;
252	}
253
254	FunctionType * getFunctionType( Type *ty ) {
255	PointerType *ptrType;
256	if ( ( ptrType = dynamic_cast< PointerType* >( ty ) ) ) {
257	return dynamic_cast< FunctionType* >( ptrType->get_base() ); // pointer if FunctionType, NULL otherwise
258	} else {
259	return dynamic_cast< FunctionType* >( ty ); // pointer if FunctionType, NULL otherwise
260	}
261	}
262
263	VariableExpr * getBaseVar( Expression expr, int levels ) {
264	int dummy;
265	if ( ! levels ) { levels = &dummy; }
266	*levels = 0;
267
268	while ( true ) {
269	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( expr ) ) {
270	return varExpr;
271	} else if ( MemberExpr memberExpr = dynamic_cast< MemberExpr >( expr ) ) {
272	expr = memberExpr->get_aggregate();
273	} else if ( AddressExpr addressExpr = dynamic_cast< AddressExpr >( expr ) ) {
274	expr = addressExpr->get_arg();
275	} else if ( UntypedExpr untypedExpr = dynamic_cast< UntypedExpr >( expr ) ) {
276	// look for compiler-inserted dereference operator
277	NameExpr fn = dynamic_cast< NameExpr >( untypedExpr->get_function() );
278	if ( ! fn \|\| fn->get_name() != std::string("*?") ) return 0;
279	expr = *untypedExpr->begin_args();
280	} else if ( CommaExpr commaExpr = dynamic_cast< CommaExpr >( expr ) ) {
281	// copy constructors insert comma exprs, look at second argument which contains the variable
282	expr = commaExpr->get_arg2();
283	continue;
284	} else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( expr ) ) {
285	int lvl1;
286	int lvl2;
287	VariableExpr * var1 = getBaseVar( condExpr->get_arg2(), &lvl1 );
288	VariableExpr * var2 = getBaseVar( condExpr->get_arg3(), &lvl2 );
289	if ( lvl1 == lvl2 && var1 && var2 && var1->get_var() == var2->get_var() ) {
290	*levels = lvl1;
291	return var1;
292	}
293	break;
294	} else break;
295
296	++(*levels);
297	}
298
299	return 0;
300	}
301
302	namespace {
303	/// Checks if is a pointer to D
304	template<typename D, typename B>
305	bool is( const B* p ) { return type_index{typeid(D)} == type_index{typeid(*p)}; }
306
307	/// Converts to a pointer to D without checking for safety
308	template<typename D, typename B>
309	inline D* as( B* p ) { return reinterpret_cast<D*>(p); }
310
311	/// Flattens a declaration list
312	template<typename Output>
313	void flattenList( list< DeclarationWithType* > src, Output out ) {
314	for ( DeclarationWithType* decl : src ) {
315	ResolvExpr::flatten( decl->get_type(), out );
316	}
317	}
318
319	/// Flattens a list of types
320	template<typename Output>
321	void flattenList( list< Type* > src, Output out ) {
322	for ( Type* ty : src ) {
323	ResolvExpr::flatten( ty, out );
324	}
325	}
326
327	/// Checks if two lists of parameters are equal up to polymorphic substitution.
328	bool paramListsPolyCompatible( const list< Expression* >& aparams, const list< Expression* >& bparams ) {
329	if ( aparams.size() != bparams.size() ) return false;
330
331	for ( list< Expression* >::const_iterator at = aparams.begin(), bt = bparams.begin();
332	at != aparams.end(); ++at, ++bt ) {
333	TypeExpr aparam = dynamic_cast< TypeExpr >(*at);
334	assertf(aparam, "Aggregate parameters should be type expressions");
335	TypeExpr bparam = dynamic_cast< TypeExpr >(*bt);
336	assertf(bparam, "Aggregate parameters should be type expressions");
337
338	// xxx - might need to let VoidType be a wildcard here too; could have some voids
339	// stuffed in for dtype-statics.
340	// if ( is<VoidType>( aparam->get_type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
341	if ( ! typesPolyCompatible( aparam->get_type(), bparam->get_type() ) ) return false;
342	}
343
344	return true;
345	}
346	}
347
348	bool typesPolyCompatible( Type a, Type b ) {
349	type_index aid{ typeid(*a) };
350	// polymorphic types always match
351	if ( aid == type_index{typeid(TypeInstType)} ) return true;
352
353	type_index bid{ typeid(*b) };
354	// polymorphic types always match
355	if ( bid == type_index{typeid(TypeInstType)} ) return true;
356
357	// can't match otherwise if different types
358	if ( aid != bid ) return false;
359
360	// recurse through type structure (conditions borrowed from Unify.cc)
361	if ( aid == type_index{typeid(BasicType)} ) {
362	return as<BasicType>(a)->get_kind() == as<BasicType>(b)->get_kind();
363	} else if ( aid == type_index{typeid(PointerType)} ) {
364	PointerType ap = as<PointerType>(a), bp = as<PointerType>(b);
365
366	// void pointers should match any other pointer type
367	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
368	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
369	} else if ( aid == type_index{typeid(ArrayType)} ) {
370	ArrayType aa = as<ArrayType>(a), ba = as<ArrayType>(b);
371
372	if ( aa->get_isVarLen() ) {
373	if ( ! ba->get_isVarLen() ) return false;
374	} else {
375	if ( ba->get_isVarLen() ) return false;
376
377	ConstantExpr ad = dynamic_cast<ConstantExpr>( aa->get_dimension() );
378	ConstantExpr bd = dynamic_cast<ConstantExpr>( ba->get_dimension() );
379	if ( ad && bd
380	&& ad->get_constant()->get_value() != bd->get_constant()->get_value() )
381	return false;
382	}
383
384	return typesPolyCompatible( aa->get_base(), ba->get_base() );
385	} else if ( aid == type_index{typeid(FunctionType)} ) {
386	FunctionType af = as<FunctionType>(a), bf = as<FunctionType>(b);
387
388	vector<Type*> aparams, bparams;
389	flattenList( af->get_parameters(), back_inserter( aparams ) );
390	flattenList( bf->get_parameters(), back_inserter( bparams ) );
391	if ( aparams.size() != bparams.size() ) return false;
392
393	vector<Type*> areturns, breturns;
394	flattenList( af->get_returnVals(), back_inserter( areturns ) );
395	flattenList( bf->get_returnVals(), back_inserter( breturns ) );
396	if ( areturns.size() != breturns.size() ) return false;
397
398	for ( unsigned i = 0; i < aparams.size(); ++i ) {
399	if ( ! typesPolyCompatible( aparams[i], bparams[i] ) ) return false;
400	}
401	for ( unsigned i = 0; i < areturns.size(); ++i ) {
402	if ( ! typesPolyCompatible( areturns[i], breturns[i] ) ) return false;
403	}
404	return true;
405	} else if ( aid == type_index{typeid(StructInstType)} ) {
406	StructInstType aa = as<StructInstType>(a), ba = as<StructInstType>(b);
407
408	if ( aa->get_name() != ba->get_name() ) return false;
409	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
410	} else if ( aid == type_index{typeid(UnionInstType)} ) {
411	UnionInstType aa = as<UnionInstType>(a), ba = as<UnionInstType>(b);
412
413	if ( aa->get_name() != ba->get_name() ) return false;
414	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
415	} else if ( aid == type_index{typeid(EnumInstType)} ) {
416	return as<EnumInstType>(a)->get_name() == as<EnumInstType>(b)->get_name();
417	} else if ( aid == type_index{typeid(TraitInstType)} ) {
418	return as<TraitInstType>(a)->get_name() == as<TraitInstType>(b)->get_name();
419	} else if ( aid == type_index{typeid(TupleType)} ) {
420	TupleType at = as<TupleType>(a), bt = as<TupleType>(b);
421
422	vector<Type*> atypes, btypes;
423	flattenList( at->get_types(), back_inserter( atypes ) );
424	flattenList( bt->get_types(), back_inserter( btypes ) );
425	if ( atypes.size() != btypes.size() ) return false;
426
427	for ( unsigned i = 0; i < atypes.size(); ++i ) {
428	if ( ! typesPolyCompatible( atypes[i], btypes[i] ) ) return false;
429	}
430	return true;
431	} else return true; // VoidType, VarArgsType, ZeroType & OneType just need the same type
432	}
433
434	bool needsBoxing( Type * param, Type * arg, const TyVarMap &exprTyVars, TypeSubstitution * env ) {
435	// is parameter is not polymorphic, don't need to box
436	if ( ! isPolyType( param, exprTyVars ) ) return false;
437	Type * newType = arg->clone();
438	if ( env ) env->apply( newType );
439	std::unique_ptr<Type> manager( newType );
440	// if the argument's type is polymorphic, we don't need to box again!
441	return ! isPolyType( newType );
442	}
443
444	bool needsBoxing( Type * param, Type * arg, ApplicationExpr * appExpr, TypeSubstitution * env ) {
445	FunctionType * function = getFunctionType( appExpr->function->result );
446	assertf( function, "ApplicationExpr has non-function type: %s", toString( appExpr->function->result ).c_str() );
447	TyVarMap exprTyVars( TypeDecl::Data{} );
448	makeTyVarMap( function, exprTyVars );
449	return needsBoxing( param, arg, exprTyVars, env );
450	}
451
452	void addToTyVarMap( TypeDecl * tyVar, TyVarMap &tyVarMap ) {
453	// xxx - should this actually be insert?
454	tyVarMap[ tyVar->get_name() ] = TypeDecl::Data{ tyVar };
455	}
456
457	void makeTyVarMap( Type *type, TyVarMap &tyVarMap ) {
458	for ( Type::ForallList::const_iterator tyVar = type->get_forall().begin(); tyVar != type->get_forall().end(); ++tyVar ) {
459	assert( *tyVar );
460	addToTyVarMap( *tyVar, tyVarMap );
461	}
462	if ( PointerType pointer = dynamic_cast< PointerType >( type ) ) {
463	makeTyVarMap( pointer->get_base(), tyVarMap );
464	}
465	}
466
467	void printTyVarMap( std::ostream &os, const TyVarMap &tyVarMap ) {
468	for ( TyVarMap::const_iterator i = tyVarMap.begin(); i != tyVarMap.end(); ++i ) {
469	os << i->first << " (" << i->second << ") ";
470	} // for
471	os << std::endl;
472	}
473
474	} // namespace GenPoly
475
476	// Local Variables: //
477	// tab-width: 4 //
478	// mode: c++ //
479	// compile-command: "make install" //
480	// End: //

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