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source: src/ResolvExpr/Resolver.cc @ a465caf

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsctordeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since a465caf was a465caf, checked in by Rob Schluntz <rschlunt@…>, 8 years ago
generate a field constructor for union types and some refactoring
Property mode set to `100644`
File size: 20.0 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	// Resolver.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Sun May 17 12:17:01 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Tue Jul 12 17:45:42 2016
13	// Update Count : 204
14	//
15
16	#include "Resolver.h"
17	#include "AlternativeFinder.h"
18	#include "Alternative.h"
19	#include "RenameVars.h"
20	#include "ResolveTypeof.h"
21	#include "SynTree/Statement.h"
22	#include "SynTree/Type.h"
23	#include "SynTree/Expression.h"
24	#include "SynTree/Initializer.h"
25	#include "SymTab/Indexer.h"
26	#include "SymTab/Autogen.h"
27	#include "Common/utility.h"
28	#include "InitTweak/InitTweak.h"
29
30	#include <iostream>
31	using namespace std;
32
33	namespace ResolvExpr {
34	class Resolver : public SymTab::Indexer {
35	public:
36	Resolver() : SymTab::Indexer( false ), switchType( 0 ) {}
37
38	virtual void visit( FunctionDecl *functionDecl );
39	virtual void visit( ObjectDecl *functionDecl );
40	virtual void visit( TypeDecl *typeDecl );
41	virtual void visit( EnumDecl * enumDecl );
42
43	virtual void visit( ArrayType * at );
44	virtual void visit( PointerType * at );
45
46	virtual void visit( ExprStmt *exprStmt );
47	virtual void visit( AsmExpr *asmExpr );
48	virtual void visit( AsmStmt *asmStmt );
49	virtual void visit( IfStmt *ifStmt );
50	virtual void visit( WhileStmt *whileStmt );
51	virtual void visit( ForStmt *forStmt );
52	virtual void visit( SwitchStmt *switchStmt );
53	virtual void visit( CaseStmt *caseStmt );
54	virtual void visit( BranchStmt *branchStmt );
55	virtual void visit( ReturnStmt *returnStmt );
56
57	virtual void visit( SingleInit *singleInit );
58	virtual void visit( ListInit *listInit );
59	virtual void visit( ConstructorInit *ctorInit );
60	private:
61	typedef std::list< Initializer * >::iterator InitIterator;
62
63	template< typename PtrType >
64	void handlePtrType( PtrType * type );
65
66	void resolveAggrInit( AggregateDecl *, InitIterator &, InitIterator & );
67	void resolveSingleAggrInit( Declaration *, InitIterator &, InitIterator & );
68	void fallbackInit( ConstructorInit * ctorInit );
69	std::list< Type * > functionReturn;
70	Type *initContext;
71	Type *switchType;
72	bool inEnumDecl = false;
73	};
74
75	void resolve( std::list< Declaration * > translationUnit ) {
76	Resolver resolver;
77	acceptAll( translationUnit, resolver );
78	#if 0
79	resolver.print( cerr );
80	for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
81	(*i)->print( std::cerr );
82	(*i)->accept( resolver );
83	} // for
84	#endif
85	}
86
87	Expression resolveInVoidContext( Expression expr, const SymTab::Indexer &indexer ) {
88	TypeEnvironment env;
89	return resolveInVoidContext( expr, indexer, env );
90	}
91
92
93	namespace {
94	void finishExpr( Expression *expr, const TypeEnvironment &env ) {
95	expr->set_env( new TypeSubstitution );
96	env.makeSubstitution( *expr->get_env() );
97	}
98	} // namespace
99
100	Expression findVoidExpression( Expression untyped, const SymTab::Indexer &indexer ) {
101	global_renamer.reset();
102	TypeEnvironment env;
103	Expression *newExpr = resolveInVoidContext( untyped, indexer, env );
104	finishExpr( newExpr, env );
105	return newExpr;
106	}
107
108	namespace {
109	Expression findSingleExpression( Expression untyped, const SymTab::Indexer &indexer ) {
110	TypeEnvironment env;
111	AlternativeFinder finder( indexer, env );
112	finder.find( untyped );
113	#if 0
114	if ( finder.get_alternatives().size() != 1 ) {
115	std::cout << "untyped expr is ";
116	untyped->print( std::cout );
117	std::cout << std::endl << "alternatives are:";
118	for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
119	i->print( std::cout );
120	} // for
121	} // if
122	#endif
123	assert( finder.get_alternatives().size() == 1 );
124	Alternative &choice = finder.get_alternatives().front();
125	Expression *newExpr = choice.expr->clone();
126	finishExpr( newExpr, choice.env );
127	return newExpr;
128	}
129
130	bool isIntegralType( Type *type ) {
131	if ( dynamic_cast< EnumInstType * >( type ) ) {
132	return true;
133	} else if ( BasicType bt = dynamic_cast< BasicType >( type ) ) {
134	return bt->isInteger();
135	} else {
136	return false;
137	} // if
138	}
139
140	Expression findIntegralExpression( Expression untyped, const SymTab::Indexer &indexer ) {
141	TypeEnvironment env;
142	AlternativeFinder finder( indexer, env );
143	finder.find( untyped );
144	#if 0
145	if ( finder.get_alternatives().size() != 1 ) {
146	std::cout << "untyped expr is ";
147	untyped->print( std::cout );
148	std::cout << std::endl << "alternatives are:";
149	for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
150	i->print( std::cout );
151	} // for
152	} // if
153	#endif
154	Expression *newExpr = 0;
155	const TypeEnvironment *newEnv = 0;
156	for ( AltList::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
157	if ( i->expr->get_results().size() == 1 && isIntegralType( i->expr->get_results().front() ) ) {
158	if ( newExpr ) {
159	throw SemanticError( "Too many interpretations for case control expression", untyped );
160	} else {
161	newExpr = i->expr->clone();
162	newEnv = &i->env;
163	} // if
164	} // if
165	} // for
166	if ( ! newExpr ) {
167	throw SemanticError( "No interpretations for case control expression", untyped );
168	} // if
169	finishExpr( newExpr, *newEnv );
170	return newExpr;
171	}
172
173	}
174
175	void Resolver::visit( ObjectDecl *objectDecl ) {
176	Type new_type = resolveTypeof( objectDecl->get_type(), this );
177	objectDecl->set_type( new_type );
178	// To handle initialization of routine pointers, e.g., int (*fp)(int) = foo(), means that class-variable
179	// initContext is changed multiple time because the LHS is analysed twice. The second analysis changes
180	// initContext because of a function type can contain object declarations in the return and parameter types. So
181	// each value of initContext is retained, so the type on the first analysis is preserved and used for selecting
182	// the RHS.
183	Type *temp = initContext;
184	initContext = new_type;
185	if ( inEnumDecl && dynamic_cast< EnumInstType * >( initContext ) ) {
186	// enumerator initializers should not use the enum type to initialize, since
187	// the enum type is still incomplete at this point. Use signed int instead.
188	initContext = new BasicType( Type::Qualifiers(), BasicType::SignedInt );
189	}
190	SymTab::Indexer::visit( objectDecl );
191	if ( inEnumDecl && dynamic_cast< EnumInstType * >( initContext ) ) {
192	// delete newly created signed int type
193	delete initContext;
194	}
195	initContext = temp;
196	}
197
198	template< typename PtrType >
199	void Resolver::handlePtrType( PtrType * type ) {
200	if ( type->get_dimension() ) {
201	CastExpr *castExpr = new CastExpr( type->get_dimension(), SymTab::SizeType->clone() );
202	Expression newExpr = findSingleExpression( castExpr, this );
203	delete type->get_dimension();
204	type->set_dimension( newExpr );
205	}
206	}
207
208	void Resolver::visit( ArrayType * at ) {
209	handlePtrType( at );
210	Visitor::visit( at );
211	}
212
213	void Resolver::visit( PointerType * pt ) {
214	handlePtrType( pt );
215	Visitor::visit( pt );
216	}
217
218	void Resolver::visit( TypeDecl *typeDecl ) {
219	if ( typeDecl->get_base() ) {
220	Type new_type = resolveTypeof( typeDecl->get_base(), this );
221	typeDecl->set_base( new_type );
222	} // if
223	SymTab::Indexer::visit( typeDecl );
224	}
225
226	void Resolver::visit( FunctionDecl *functionDecl ) {
227	#if 0
228	std::cout << "resolver visiting functiondecl ";
229	functionDecl->print( std::cout );
230	std::cout << std::endl;
231	#endif
232	Type new_type = resolveTypeof( functionDecl->get_type(), this );
233	functionDecl->set_type( new_type );
234	std::list< Type * > oldFunctionReturn = functionReturn;
235	functionReturn.clear();
236	for ( std::list< DeclarationWithType * >::const_iterator i = functionDecl->get_functionType()->get_returnVals().begin(); i != functionDecl->get_functionType()->get_returnVals().end(); ++i ) {
237	functionReturn.push_back( (*i)->get_type() );
238	} // for
239	SymTab::Indexer::visit( functionDecl );
240	functionReturn = oldFunctionReturn;
241	}
242
243	void Resolver::visit( EnumDecl * enumDecl ) {
244	// in case we decide to allow nested enums
245	bool oldInEnumDecl = inEnumDecl;
246	inEnumDecl = true;
247	SymTab::Indexer::visit( enumDecl );
248	inEnumDecl = oldInEnumDecl;
249	}
250
251	void Resolver::visit( ExprStmt *exprStmt ) {
252	if ( exprStmt->get_expr() ) {
253	Expression newExpr = findVoidExpression( exprStmt->get_expr(), this );
254	delete exprStmt->get_expr();
255	exprStmt->set_expr( newExpr );
256	} // if
257	}
258
259	void Resolver::visit( AsmExpr *asmExpr ) {
260	Expression newExpr = findVoidExpression( asmExpr->get_operand(), this );
261	delete asmExpr->get_operand();
262	asmExpr->set_operand( newExpr );
263	if ( asmExpr->get_inout() ) {
264	newExpr = findVoidExpression( asmExpr->get_inout(), *this );
265	delete asmExpr->get_inout();
266	asmExpr->set_inout( newExpr );
267	} // if
268	}
269
270	void Resolver::visit( AsmStmt *asmStmt ) {
271	acceptAll( asmStmt->get_input(), *this);
272	acceptAll( asmStmt->get_output(), *this);
273	}
274
275	void Resolver::visit( IfStmt *ifStmt ) {
276	Expression newExpr = findSingleExpression( ifStmt->get_condition(), this );
277	delete ifStmt->get_condition();
278	ifStmt->set_condition( newExpr );
279	Visitor::visit( ifStmt );
280	}
281
282	void Resolver::visit( WhileStmt *whileStmt ) {
283	Expression newExpr = findSingleExpression( whileStmt->get_condition(), this );
284	delete whileStmt->get_condition();
285	whileStmt->set_condition( newExpr );
286	Visitor::visit( whileStmt );
287	}
288
289	void Resolver::visit( ForStmt *forStmt ) {
290	SymTab::Indexer::visit( forStmt );
291
292	if ( forStmt->get_condition() ) {
293	Expression * newExpr = findSingleExpression( forStmt->get_condition(), *this );
294	delete forStmt->get_condition();
295	forStmt->set_condition( newExpr );
296	} // if
297
298	if ( forStmt->get_increment() ) {
299	Expression * newExpr = findVoidExpression( forStmt->get_increment(), *this );
300	delete forStmt->get_increment();
301	forStmt->set_increment( newExpr );
302	} // if
303	}
304
305	template< typename SwitchClass >
306	void handleSwitchStmt( SwitchClass *switchStmt, SymTab::Indexer &visitor ) {
307	Expression *newExpr;
308	newExpr = findIntegralExpression( switchStmt->get_condition(), visitor );
309	delete switchStmt->get_condition();
310	switchStmt->set_condition( newExpr );
311
312	visitor.Visitor::visit( switchStmt );
313	}
314
315	void Resolver::visit( SwitchStmt *switchStmt ) {
316	handleSwitchStmt( switchStmt, *this );
317	}
318
319	void Resolver::visit( CaseStmt *caseStmt ) {
320	Visitor::visit( caseStmt );
321	}
322
323	void Resolver::visit( BranchStmt *branchStmt ) {
324	// must resolve the argument for a computed goto
325	if ( branchStmt->get_type() == BranchStmt::Goto ) { // check for computed goto statement
326	if ( Expression * arg = branchStmt->get_computedTarget() ) {
327	VoidType v = Type::Qualifiers(); // cast to void * for the alternative finder
328	PointerType pt( Type::Qualifiers(), v.clone() );
329	CastExpr * castExpr = new CastExpr( arg, pt.clone() );
330	Expression * newExpr = findSingleExpression( castExpr, *this ); // find best expression
331	branchStmt->set_target( newExpr );
332	} // if
333	} // if
334	}
335
336	void Resolver::visit( ReturnStmt *returnStmt ) {
337	if ( returnStmt->get_expr() ) {
338	CastExpr *castExpr = new CastExpr( returnStmt->get_expr() );
339	cloneAll( functionReturn, castExpr->get_results() );
340	Expression newExpr = findSingleExpression( castExpr, this );
341	delete castExpr;
342	returnStmt->set_expr( newExpr );
343	} // if
344	}
345
346	template< typename T >
347	bool isCharType( T t ) {
348	if ( BasicType * bt = dynamic_cast< BasicType * >( t ) ) {
349	return bt->get_kind() == BasicType::Char \|\| bt->get_kind() == BasicType::SignedChar \|\|
350	bt->get_kind() == BasicType::UnsignedChar;
351	}
352	return false;
353	}
354
355	void Resolver::visit( SingleInit *singleInit ) {
356	if ( singleInit->get_value() ) {
357	#if 0
358	if (NameExpr * ne = dynamic_cast<NameExpr*>(singleInit->get_value())) {
359	string n = ne->get_name();
360	if (n == "0") {
361	initContext = new BasicType(Type::Qualifiers(),
362	BasicType::SignedInt);
363	} else {
364	DeclarationWithType * decl = lookupId( n );
365	initContext = decl->get_type();
366	}
367	} else if (ConstantExpr * e =
368	dynamic_cast<ConstantExpr*>(singleInit->get_value())) {
369	Constant *c = e->get_constant();
370	initContext = c->get_type();
371	} else {
372	assert(0);
373	}
374	#endif
375	CastExpr *castExpr = new CastExpr( singleInit->get_value(), initContext->clone() );
376	Expression newExpr = findSingleExpression( castExpr, this );
377	delete castExpr;
378	singleInit->set_value( newExpr );
379
380	// check if initializing type is char[]
381	if ( ArrayType * at = dynamic_cast< ArrayType * >( initContext ) ) {
382	if ( isCharType( at->get_base() ) ) {
383	// check if the resolved type is char *
384	if ( PointerType * pt = dynamic_cast< PointerType *>( newExpr->get_results().front() ) ) {
385	if ( isCharType( pt->get_base() ) ) {
386	// strip cast if we're initializing a char[] with a char *, e.g. char x[] = "hello";
387	CastExpr ce = dynamic_cast< CastExpr >( newExpr );
388	singleInit->set_value( ce->get_arg() );
389	ce->set_arg( NULL );
390	delete ce;
391	}
392	}
393	}
394	}
395	} // if
396	// singleInit->get_value()->accept( *this );
397	}
398
399	void Resolver::resolveSingleAggrInit( Declaration * dcl, InitIterator & init, InitIterator & initEnd ) {
400	DeclarationWithType * dt = dynamic_cast< DeclarationWithType * >( dcl );
401	assert( dt );
402	initContext = dt->get_type();
403	try {
404	if ( init == initEnd ) return; // stop when there are no more initializers
405	(init)->accept( this );
406	++init; // made it past an initializer
407	} catch( SemanticError & ) {
408	// need to delve deeper, if you can
409	if ( StructInstType * sit = dynamic_cast< StructInstType * >( dt->get_type() ) ) {
410	resolveAggrInit( sit->get_baseStruct(), init, initEnd );
411	} else if ( UnionInstType * uit = dynamic_cast< UnionInstType * >( dt->get_type() ) ) {
412	resolveAggrInit( uit->get_baseUnion(), init, initEnd );
413	} else {
414	// member is not an aggregate type, so can't go any deeper
415
416	// might need to rethink what is being thrown
417	throw;
418	} // if
419	}
420	}
421
422	void Resolver::resolveAggrInit( AggregateDecl * aggr, InitIterator & init, InitIterator & initEnd ) {
423	if ( StructDecl * st = dynamic_cast< StructDecl * >( aggr ) ) {
424	// want to resolve each initializer to the members of the struct,
425	// but if there are more initializers than members we should stop
426	list< Declaration * >::iterator it = st->get_members().begin();
427	for ( ; it != st->get_members().end(); ++it) {
428	resolveSingleAggrInit( *it, init, initEnd );
429	}
430	} else if ( UnionDecl * un = dynamic_cast< UnionDecl * >( aggr ) ) {
431	// only resolve to the first member of a union
432	resolveSingleAggrInit( *un->get_members().begin(), init, initEnd );
433	} // if
434	}
435
436	void Resolver::visit( ListInit * listInit ) {
437	InitIterator iter = listInit->begin();
438	InitIterator end = listInit->end();
439
440	if ( ArrayType * at = dynamic_cast< ArrayType * >( initContext ) ) {
441	// resolve each member to the base type of the array
442	for ( ; iter != end; ++iter ) {
443	initContext = at->get_base();
444	(iter)->accept( this );
445	} // for
446	} else if ( StructInstType * st = dynamic_cast< StructInstType * >( initContext ) ) {
447	resolveAggrInit( st->get_baseStruct(), iter, end );
448	} else if ( UnionInstType * st = dynamic_cast< UnionInstType * >( initContext ) ) {
449	resolveAggrInit( st->get_baseUnion(), iter, end );
450	} else if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( initContext ) ) {
451	Type * base = tt->get_baseType()->get_base();
452	if ( base ) {
453	// know the implementation type, so try using that as the initContext
454	initContext = base;
455	visit( listInit );
456	} else {
457	// missing implementation type -- might be an unknown type variable, so try proceeding with the current init context
458	Visitor::visit( listInit );
459	}
460	} else {
461	assert( dynamic_cast< BasicType * >( initContext ) \|\| dynamic_cast< PointerType * >( initContext ) );
462	// basic types are handled here
463	Visitor::visit( listInit );
464	}
465
466	#if 0
467	if ( ArrayType at = dynamic_cast<ArrayType>(initContext) ) {
468	std::list<Initializer *>::iterator iter( listInit->begin_initializers() );
469	for ( ; iter != listInit->end_initializers(); ++iter ) {
470	initContext = at->get_base();
471	(iter)->accept( this );
472	} // for
473	} else if ( StructInstType st = dynamic_cast<StructInstType>(initContext) ) {
474	StructDecl *baseStruct = st->get_baseStruct();
475	std::list<Declaration *>::iterator iter1( baseStruct->get_members().begin() );
476	std::list<Initializer *>::iterator iter2( listInit->begin_initializers() );
477	for ( ; iter1 != baseStruct->get_members().end() && iter2 != listInit->end_initializers(); ++iter2 ) {
478	if ( (*iter2)->get_designators().empty() ) {
479	DeclarationWithType dt = dynamic_cast<DeclarationWithType >( *iter1 );
480	initContext = dt->get_type();
481	(iter2)->accept( this );
482	++iter1;
483	} else {
484	StructDecl *st = baseStruct;
485	iter1 = st->get_members().begin();
486	std::list<Expression >::iterator iter3( (iter2)->get_designators().begin() );
487	for ( ; iter3 != (*iter2)->get_designators().end(); ++iter3 ) {
488	NameExpr key = dynamic_cast<NameExpr >( *iter3 );
489	assert( key );
490	for ( ; iter1 != st->get_members().end(); ++iter1 ) {
491	if ( key->get_name() == (*iter1)->get_name() ) {
492	(*iter1)->print( cout );
493	cout << key->get_name() << endl;
494	ObjectDecl fred = dynamic_cast<ObjectDecl >( *iter1 );
495	assert( fred );
496	StructInstType mary = dynamic_cast<StructInstType>( fred->get_type() );
497	assert( mary );
498	st = mary->get_baseStruct();
499	iter1 = st->get_members().begin();
500	break;
501	} // if
502	} // for
503	} // for
504	ObjectDecl fred = dynamic_cast<ObjectDecl >( *iter1 );
505	assert( fred );
506	initContext = fred->get_type();
507	(listInit->begin_initializers())->accept( this );
508	} // if
509	} // for
510	} else if ( UnionInstType st = dynamic_cast<UnionInstType>(initContext) ) {
511	DeclarationWithType dt = dynamic_cast<DeclarationWithType >( *st->get_baseUnion()->get_members().begin() );
512	initContext = dt->get_type();
513	(listInit->begin_initializers())->accept( this );
514	} // if
515	#endif
516	}
517
518	// ConstructorInit - fall back on C-style initializer
519	void Resolver::fallbackInit( ConstructorInit * ctorInit ) {
520	// could not find valid constructor, or found an intrinsic constructor
521	// fall back on C-style initializer
522	delete ctorInit->get_ctor();
523	ctorInit->set_ctor( NULL );
524	delete ctorInit->get_dtor();
525	ctorInit->set_dtor( NULL );
526	maybeAccept( ctorInit->get_init(), *this );
527	}
528
529	void Resolver::visit( ConstructorInit *ctorInit ) {
530	try {
531	maybeAccept( ctorInit->get_ctor(), *this );
532	maybeAccept( ctorInit->get_dtor(), *this );
533	} catch ( SemanticError ) {
534	// no alternatives for the constructor initializer - fallback on C-style initializer
535	// xxx - not sure if this makes a ton of sense - should maybe never be able to have this situation?
536	fallbackInit( ctorInit );
537	return;
538	}
539
540	// found a constructor - can get rid of C-style initializer
541	delete ctorInit->get_init();
542	ctorInit->set_init( NULL );
543
544	// intrinsic single parameter constructors and destructors do nothing. Since this was
545	// implicitly generated, there's no way for it to have side effects, so get rid of it
546	// to clean up generated code.
547	if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_ctor() ) ) {
548	delete ctorInit->get_ctor();
549	ctorInit->set_ctor( NULL );
550	}
551
552	if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_dtor() ) ) {
553	delete ctorInit->get_dtor();
554	ctorInit->set_dtor( NULL );
555	}
556
557	// xxx - todo -- what about arrays?
558	// if ( dtor == NULL && InitTweak::isIntrinsicCallStmt( ctorInit->get_ctor() ) ) {
559	// // can reduce the constructor down to a SingleInit using the
560	// // second argument from the ctor call, since
561	// delete ctorInit->get_ctor();
562	// ctorInit->set_ctor( NULL );
563
564	// Expression * arg =
565	// ctorInit->set_init( new SingleInit( arg ) );
566	// }
567	}
568	} // namespace ResolvExpr
569
570	// Local Variables: //
571	// tab-width: 4 //
572	// mode: c++ //
573	// compile-command: "make install" //
574	// End: //

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