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source: src/GenPoly/GenPoly.cc @ 907c545

ADTarm-ehast-experimentalcleanup-dtorsenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since 907c545 was 02fdb8e, checked in by Thierry Delisle <tdelisle@…>, 6 years ago
Added WithConstTypeSubstitution? accessory on pass visitor. Mostly exploratory work, figuring out what can be const
Property mode set to `100644`
File size: 19.4 KB

Line
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 ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
103	return isPolyType( arrayType->base, env );
104	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
105	if ( hasPolyParams( structType->get_parameters(), env ) ) return type;
106	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
107	if ( hasPolyParams( unionType->get_parameters(), env ) ) return type;
108	}
109	return 0;
110	}
111
112	Type isPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
113	type = replaceTypeInst( type, env );
114
115	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
116	if ( tyVars.find( typeInst->get_name() ) != tyVars.end() ) {
117	return type;
118	}
119	} else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
120	return isPolyType( arrayType->base, tyVars, env );
121	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
122	if ( hasPolyParams( structType->get_parameters(), tyVars, env ) ) return type;
123	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
124	if ( hasPolyParams( unionType->get_parameters(), tyVars, env ) ) return type;
125	}
126	return 0;
127	}
128
129	ReferenceToType isDynType( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
130	type = replaceTypeInst( type, env );
131
132	if ( TypeInstType typeInst = dynamic_cast< TypeInstType >( type ) ) {
133	auto var = tyVars.find( typeInst->get_name() );
134	if ( var != tyVars.end() && var->second.isComplete ) {
135	return typeInst;
136	}
137	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
138	if ( hasDynParams( structType->get_parameters(), tyVars, env ) ) return structType;
139	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
140	if ( hasDynParams( unionType->get_parameters(), tyVars, env ) ) return unionType;
141	}
142	return 0;
143	}
144
145	ReferenceToType isDynRet( FunctionType function, const TyVarMap &forallTypes ) {
146	if ( function->get_returnVals().empty() ) return 0;
147
148	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
149	}
150
151	ReferenceToType isDynRet( FunctionType function ) {
152	if ( function->get_returnVals().empty() ) return 0;
153
154	TyVarMap forallTypes( TypeDecl::Data{} );
155	makeTyVarMap( function, forallTypes );
156	return (ReferenceToType*)isDynType( function->get_returnVals().front()->get_type(), forallTypes );
157	}
158
159	bool needsAdapter( FunctionType *adaptee, const TyVarMap &tyVars ) {
160	// if ( ! adaptee->get_returnVals().empty() && isPolyType( adaptee->get_returnVals().front()->get_type(), tyVars ) ) {
161	// return true;
162	// } // if
163	if ( isDynRet( adaptee, tyVars ) ) return true;
164
165	for ( std::list< DeclarationWithType* >::const_iterator innerArg = adaptee->get_parameters().begin(); innerArg != adaptee->get_parameters().end(); ++innerArg ) {
166	// if ( isPolyType( (*innerArg)->get_type(), tyVars ) ) {
167	if ( isDynType( (*innerArg)->get_type(), tyVars ) ) {
168	return true;
169	} // if
170	} // for
171	return false;
172	}
173
174	Type isPolyPtr( Type type, const TypeSubstitution *env ) {
175	type = replaceTypeInst( type, env );
176
177	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
178	return isPolyType( ptr->get_base(), env );
179	}
180	return 0;
181	}
182
183	Type isPolyPtr( Type type, const TyVarMap &tyVars, const TypeSubstitution *env ) {
184	type = replaceTypeInst( type, env );
185
186	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
187	return isPolyType( ptr->get_base(), tyVars, env );
188	}
189	return 0;
190	}
191
192	Type * hasPolyBase( Type type, int levels, const TypeSubstitution *env ) {
193	int dummy;
194	if ( ! levels ) { levels = &dummy; }
195	*levels = 0;
196
197	while ( true ) {
198	type = replaceTypeInst( type, env );
199
200	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
201	type = ptr->get_base();
202	++(*levels);
203	} else break;
204	}
205
206	return isPolyType( type, env );
207	}
208
209	Type * hasPolyBase( Type type, const TyVarMap &tyVars, int levels, const TypeSubstitution *env ) {
210	int dummy;
211	if ( ! levels ) { levels = &dummy; }
212	*levels = 0;
213
214	while ( true ) {
215	type = replaceTypeInst( type, env );
216
217	if ( PointerType ptr = dynamic_cast< PointerType >( type ) ) {
218	type = ptr->get_base();
219	++(*levels);
220	} else break;
221	}
222
223	return isPolyType( type, tyVars, env );
224	}
225
226	bool includesPolyType( Type type, const TypeSubstitution env ) {
227	type = replaceTypeInst( type, env );
228
229	if ( dynamic_cast< TypeInstType * >( type ) ) {
230	return true;
231	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
232	if ( includesPolyType( pointerType->get_base(), env ) ) return true;
233	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
234	if ( includesPolyParams( structType->get_parameters(), env ) ) return true;
235	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
236	if ( includesPolyParams( unionType->get_parameters(), env ) ) return true;
237	}
238	return false;
239	}
240
241	bool includesPolyType( Type type, const TyVarMap &tyVars, const TypeSubstitution env ) {
242	type = replaceTypeInst( type, env );
243
244	if ( TypeInstType typeInstType = dynamic_cast< TypeInstType >( type ) ) {
245	if ( tyVars.find( typeInstType->get_name() ) != tyVars.end() ) {
246	return true;
247	}
248	} else if ( PointerType pointerType = dynamic_cast< PointerType >( type ) ) {
249	if ( includesPolyType( pointerType->get_base(), tyVars, env ) ) return true;
250	} else if ( StructInstType structType = dynamic_cast< StructInstType >( type ) ) {
251	if ( includesPolyParams( structType->get_parameters(), tyVars, env ) ) return true;
252	} else if ( UnionInstType unionType = dynamic_cast< UnionInstType >( type ) ) {
253	if ( includesPolyParams( unionType->get_parameters(), tyVars, env ) ) return true;
254	}
255	return false;
256	}
257
258	FunctionType * getFunctionType( Type *ty ) {
259	PointerType *ptrType;
260	if ( ( ptrType = dynamic_cast< PointerType* >( ty ) ) ) {
261	return dynamic_cast< FunctionType* >( ptrType->get_base() ); // pointer if FunctionType, NULL otherwise
262	} else {
263	return dynamic_cast< FunctionType* >( ty ); // pointer if FunctionType, NULL otherwise
264	}
265	}
266
267	VariableExpr * getBaseVar( Expression expr, int levels ) {
268	int dummy;
269	if ( ! levels ) { levels = &dummy; }
270	*levels = 0;
271
272	while ( true ) {
273	if ( VariableExpr varExpr = dynamic_cast< VariableExpr >( expr ) ) {
274	return varExpr;
275	} else if ( MemberExpr memberExpr = dynamic_cast< MemberExpr >( expr ) ) {
276	expr = memberExpr->get_aggregate();
277	} else if ( AddressExpr addressExpr = dynamic_cast< AddressExpr >( expr ) ) {
278	expr = addressExpr->get_arg();
279	} else if ( UntypedExpr untypedExpr = dynamic_cast< UntypedExpr >( expr ) ) {
280	// look for compiler-inserted dereference operator
281	NameExpr fn = dynamic_cast< NameExpr >( untypedExpr->get_function() );
282	if ( ! fn \|\| fn->get_name() != std::string("*?") ) return 0;
283	expr = *untypedExpr->begin_args();
284	} else if ( CommaExpr commaExpr = dynamic_cast< CommaExpr >( expr ) ) {
285	// copy constructors insert comma exprs, look at second argument which contains the variable
286	expr = commaExpr->get_arg2();
287	continue;
288	} else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( expr ) ) {
289	int lvl1;
290	int lvl2;
291	VariableExpr * var1 = getBaseVar( condExpr->get_arg2(), &lvl1 );
292	VariableExpr * var2 = getBaseVar( condExpr->get_arg3(), &lvl2 );
293	if ( lvl1 == lvl2 && var1 && var2 && var1->get_var() == var2->get_var() ) {
294	*levels = lvl1;
295	return var1;
296	}
297	break;
298	} else break;
299
300	++(*levels);
301	}
302
303	return 0;
304	}
305
306	namespace {
307	/// Checks if is a pointer to D
308	template<typename D, typename B>
309	bool is( const B* p ) { return type_index{typeid(D)} == type_index{typeid(*p)}; }
310
311	/// Converts to a pointer to D without checking for safety
312	template<typename D, typename B>
313	inline D* as( B* p ) { return reinterpret_cast<D*>(p); }
314
315	/// Flattens a declaration list
316	template<typename Output>
317	void flattenList( list< DeclarationWithType* > src, Output out ) {
318	for ( DeclarationWithType* decl : src ) {
319	ResolvExpr::flatten( decl->get_type(), out );
320	}
321	}
322
323	/// Flattens a list of types
324	template<typename Output>
325	void flattenList( list< Type* > src, Output out ) {
326	for ( Type* ty : src ) {
327	ResolvExpr::flatten( ty, out );
328	}
329	}
330
331	/// Checks if two lists of parameters are equal up to polymorphic substitution.
332	bool paramListsPolyCompatible( const list< Expression* >& aparams, const list< Expression* >& bparams ) {
333	if ( aparams.size() != bparams.size() ) return false;
334
335	for ( list< Expression* >::const_iterator at = aparams.begin(), bt = bparams.begin();
336	at != aparams.end(); ++at, ++bt ) {
337	TypeExpr aparam = dynamic_cast< TypeExpr >(*at);
338	assertf(aparam, "Aggregate parameters should be type expressions");
339	TypeExpr bparam = dynamic_cast< TypeExpr >(*bt);
340	assertf(bparam, "Aggregate parameters should be type expressions");
341
342	// xxx - might need to let VoidType be a wildcard here too; could have some voids
343	// stuffed in for dtype-statics.
344	// if ( is<VoidType>( aparam->get_type() ) \|\| is<VoidType>( bparam->get_type() ) ) continue;
345	if ( ! typesPolyCompatible( aparam->get_type(), bparam->get_type() ) ) return false;
346	}
347
348	return true;
349	}
350	}
351
352	bool typesPolyCompatible( Type a, Type b ) {
353	type_index aid{ typeid(*a) };
354	// polymorphic types always match
355	if ( aid == type_index{typeid(TypeInstType)} ) return true;
356
357	type_index bid{ typeid(*b) };
358	// polymorphic types always match
359	if ( bid == type_index{typeid(TypeInstType)} ) return true;
360
361	// can't match otherwise if different types
362	if ( aid != bid ) return false;
363
364	// recurse through type structure (conditions borrowed from Unify.cc)
365	if ( aid == type_index{typeid(BasicType)} ) {
366	return as<BasicType>(a)->get_kind() == as<BasicType>(b)->get_kind();
367	} else if ( aid == type_index{typeid(PointerType)} ) {
368	PointerType ap = as<PointerType>(a), bp = as<PointerType>(b);
369
370	// void pointers should match any other pointer type
371	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
372	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
373	} else if ( aid == type_index{typeid(ReferenceType)} ) {
374	ReferenceType ap = as<ReferenceType>(a), bp = as<ReferenceType>(b);
375	return is<VoidType>( ap->get_base() ) \|\| is<VoidType>( bp->get_base() )
376	\|\| typesPolyCompatible( ap->get_base(), bp->get_base() );
377	} else if ( aid == type_index{typeid(ArrayType)} ) {
378	ArrayType aa = as<ArrayType>(a), ba = as<ArrayType>(b);
379
380	if ( aa->get_isVarLen() ) {
381	if ( ! ba->get_isVarLen() ) return false;
382	} else {
383	if ( ba->get_isVarLen() ) return false;
384
385	ConstantExpr ad = dynamic_cast<ConstantExpr>( aa->get_dimension() );
386	ConstantExpr bd = dynamic_cast<ConstantExpr>( ba->get_dimension() );
387	if ( ad && bd
388	&& ad->get_constant()->get_value() != bd->get_constant()->get_value() )
389	return false;
390	}
391
392	return typesPolyCompatible( aa->get_base(), ba->get_base() );
393	} else if ( aid == type_index{typeid(FunctionType)} ) {
394	FunctionType af = as<FunctionType>(a), bf = as<FunctionType>(b);
395
396	vector<Type*> aparams, bparams;
397	flattenList( af->get_parameters(), back_inserter( aparams ) );
398	flattenList( bf->get_parameters(), back_inserter( bparams ) );
399	if ( aparams.size() != bparams.size() ) return false;
400
401	vector<Type*> areturns, breturns;
402	flattenList( af->get_returnVals(), back_inserter( areturns ) );
403	flattenList( bf->get_returnVals(), back_inserter( breturns ) );
404	if ( areturns.size() != breturns.size() ) return false;
405
406	for ( unsigned i = 0; i < aparams.size(); ++i ) {
407	if ( ! typesPolyCompatible( aparams[i], bparams[i] ) ) return false;
408	}
409	for ( unsigned i = 0; i < areturns.size(); ++i ) {
410	if ( ! typesPolyCompatible( areturns[i], breturns[i] ) ) return false;
411	}
412	return true;
413	} else if ( aid == type_index{typeid(StructInstType)} ) {
414	StructInstType aa = as<StructInstType>(a), ba = as<StructInstType>(b);
415
416	if ( aa->get_name() != ba->get_name() ) return false;
417	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
418	} else if ( aid == type_index{typeid(UnionInstType)} ) {
419	UnionInstType aa = as<UnionInstType>(a), ba = as<UnionInstType>(b);
420
421	if ( aa->get_name() != ba->get_name() ) return false;
422	return paramListsPolyCompatible( aa->get_parameters(), ba->get_parameters() );
423	} else if ( aid == type_index{typeid(EnumInstType)} ) {
424	return as<EnumInstType>(a)->get_name() == as<EnumInstType>(b)->get_name();
425	} else if ( aid == type_index{typeid(TraitInstType)} ) {
426	return as<TraitInstType>(a)->get_name() == as<TraitInstType>(b)->get_name();
427	} else if ( aid == type_index{typeid(TupleType)} ) {
428	TupleType at = as<TupleType>(a), bt = as<TupleType>(b);
429
430	vector<Type*> atypes, btypes;
431	flattenList( at->get_types(), back_inserter( atypes ) );
432	flattenList( bt->get_types(), back_inserter( btypes ) );
433	if ( atypes.size() != btypes.size() ) return false;
434
435	for ( unsigned i = 0; i < atypes.size(); ++i ) {
436	if ( ! typesPolyCompatible( atypes[i], btypes[i] ) ) return false;
437	}
438	return true;
439	} else return true; // VoidType, VarArgsType, ZeroType & OneType just need the same type
440	}
441
442	bool needsBoxing( Type * param, Type * arg, const TyVarMap &exprTyVars, const TypeSubstitution * env ) {
443	// is parameter is not polymorphic, don't need to box
444	if ( ! isPolyType( param, exprTyVars ) ) return false;
445	Type * newType = arg->clone();
446	if ( env ) env->apply( newType );
447	std::unique_ptr<Type> manager( newType );
448	// if the argument's type is polymorphic, we don't need to box again!
449	return ! isPolyType( newType );
450	}
451
452	bool needsBoxing( Type * param, Type * arg, ApplicationExpr * appExpr, const TypeSubstitution * env ) {
453	FunctionType * function = getFunctionType( appExpr->function->result );
454	assertf( function, "ApplicationExpr has non-function type: %s", toString( appExpr->function->result ).c_str() );
455	TyVarMap exprTyVars( TypeDecl::Data{} );
456	makeTyVarMap( function, exprTyVars );
457	return needsBoxing( param, arg, exprTyVars, env );
458	}
459
460	void addToTyVarMap( TypeDecl * tyVar, TyVarMap &tyVarMap ) {
461	// xxx - should this actually be insert?
462	tyVarMap[ tyVar->get_name() ] = TypeDecl::Data{ tyVar };
463	}
464
465	void makeTyVarMap( Type *type, TyVarMap &tyVarMap ) {
466	for ( Type::ForallList::const_iterator tyVar = type->get_forall().begin(); tyVar != type->get_forall().end(); ++tyVar ) {
467	assert( *tyVar );
468	addToTyVarMap( *tyVar, tyVarMap );
469	}
470	if ( PointerType pointer = dynamic_cast< PointerType >( type ) ) {
471	makeTyVarMap( pointer->get_base(), tyVarMap );
472	}
473	}
474
475	void printTyVarMap( std::ostream &os, const TyVarMap &tyVarMap ) {
476	for ( TyVarMap::const_iterator i = tyVarMap.begin(); i != tyVarMap.end(); ++i ) {
477	os << i->first << " (" << i->second << ") ";
478	} // for
479	os << std::endl;
480	}
481
482	} // namespace GenPoly
483
484	// Local Variables: //
485	// tab-width: 4 //
486	// mode: c++ //
487	// compile-command: "make install" //
488	// End: //

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