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source: src/ResolvExpr/Resolver.cc @ d94195d

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

Last change on this file since d94195d was 307a732, checked in by Andrew Beach <ajbeach@…>, 7 years ago
The exception handling code compilers and translates, but the translation crashes.
Property mode set to `100644`
File size: 18.7 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	// 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 : Thu Mar 23 17:23:14 2017
13	// Update Count : 211
14	//
15
16	#include <iostream>
17
18	#include "Alternative.h"
19	#include "AlternativeFinder.h"
20	#include "CurrentObject.h"
21	#include "RenameVars.h"
22	#include "Resolver.h"
23	#include "ResolveTypeof.h"
24	#include "typeops.h"
25
26	#include "SynTree/Expression.h"
27	#include "SynTree/Initializer.h"
28	#include "SynTree/Statement.h"
29	#include "SynTree/Type.h"
30
31	#include "SymTab/Autogen.h"
32	#include "SymTab/Indexer.h"
33
34	#include "Common/utility.h"
35
36	#include "InitTweak/InitTweak.h"
37
38	using namespace std;
39
40	namespace ResolvExpr {
41	class Resolver final : public SymTab::Indexer {
42	public:
43	Resolver() : SymTab::Indexer( false ) {}
44	Resolver( const SymTab:: Indexer & other ) : SymTab::Indexer( other ) {
45	if ( const Resolver * res = dynamic_cast< const Resolver * >( &other ) ) {
46	functionReturn = res->functionReturn;
47	currentObject = res->currentObject;
48	inEnumDecl = res->inEnumDecl;
49	}
50	}
51
52	typedef SymTab::Indexer Parent;
53	using Parent::visit;
54	virtual void visit( FunctionDecl *functionDecl ) override;
55	virtual void visit( ObjectDecl *functionDecl ) override;
56	virtual void visit( TypeDecl *typeDecl ) override;
57	virtual void visit( EnumDecl * enumDecl ) override;
58
59	virtual void visit( ArrayType * at ) override;
60	virtual void visit( PointerType * at ) override;
61
62	virtual void visit( ExprStmt *exprStmt ) override;
63	virtual void visit( AsmExpr *asmExpr ) override;
64	virtual void visit( AsmStmt *asmStmt ) override;
65	virtual void visit( IfStmt *ifStmt ) override;
66	virtual void visit( WhileStmt *whileStmt ) override;
67	virtual void visit( ForStmt *forStmt ) override;
68	virtual void visit( SwitchStmt *switchStmt ) override;
69	virtual void visit( CaseStmt *caseStmt ) override;
70	virtual void visit( BranchStmt *branchStmt ) override;
71	virtual void visit( ReturnStmt *returnStmt ) override;
72	virtual void visit( ThrowStmt *throwStmt ) override;
73
74	virtual void visit( SingleInit *singleInit ) override;
75	virtual void visit( ListInit *listInit ) override;
76	virtual void visit( ConstructorInit *ctorInit ) override;
77	private:
78	typedef std::list< Initializer * >::iterator InitIterator;
79
80	template< typename PtrType >
81	void handlePtrType( PtrType * type );
82
83	void resolveAggrInit( ReferenceToType *, InitIterator &, InitIterator & );
84	void resolveSingleAggrInit( Declaration *, InitIterator &, InitIterator &, TypeSubstitution sub );
85	void fallbackInit( ConstructorInit * ctorInit );
86
87	Type * functionReturn = nullptr;
88	CurrentObject currentObject = nullptr;
89	bool inEnumDecl = false;
90	};
91
92	void resolve( std::list< Declaration * > translationUnit ) {
93	Resolver resolver;
94	acceptAll( translationUnit, resolver );
95	}
96
97	Expression resolveInVoidContext( Expression expr, const SymTab::Indexer &indexer ) {
98	TypeEnvironment env;
99	return resolveInVoidContext( expr, indexer, env );
100	}
101
102
103	namespace {
104	void finishExpr( Expression *expr, const TypeEnvironment &env ) {
105	expr->set_env( new TypeSubstitution );
106	env.makeSubstitution( *expr->get_env() );
107	}
108	} // namespace
109
110	Expression findVoidExpression( Expression untyped, const SymTab::Indexer &indexer ) {
111	global_renamer.reset();
112	TypeEnvironment env;
113	Expression *newExpr = resolveInVoidContext( untyped, indexer, env );
114	finishExpr( newExpr, env );
115	return newExpr;
116	}
117
118	namespace {
119	Expression findSingleExpression( Expression untyped, const SymTab::Indexer &indexer ) {
120	TypeEnvironment env;
121	AlternativeFinder finder( indexer, env );
122	finder.find( untyped );
123	#if 0
124	if ( finder.get_alternatives().size() != 1 ) {
125	std::cout << "untyped expr is ";
126	untyped->print( std::cout );
127	std::cout << std::endl << "alternatives are:";
128	for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
129	i->print( std::cout );
130	} // for
131	} // if
132	#endif
133	assertf( finder.get_alternatives().size() == 1, "findSingleExpression: must have exactly one alternative at the end." );
134	Alternative &choice = finder.get_alternatives().front();
135	Expression *newExpr = choice.expr->clone();
136	finishExpr( newExpr, choice.env );
137	return newExpr;
138	}
139
140	bool isIntegralType( Type *type ) {
141	if ( dynamic_cast< EnumInstType * >( type ) ) {
142	return true;
143	} else if ( BasicType bt = dynamic_cast< BasicType >( type ) ) {
144	return bt->isInteger();
145	} else if ( dynamic_cast< ZeroType* >( type ) != nullptr \|\| dynamic_cast< OneType* >( type ) != nullptr ) {
146	return true;
147	} else {
148	return false;
149	} // if
150	}
151
152	Expression findIntegralExpression( Expression untyped, const SymTab::Indexer &indexer ) {
153	TypeEnvironment env;
154	AlternativeFinder finder( indexer, env );
155	finder.find( untyped );
156	#if 0
157	if ( finder.get_alternatives().size() != 1 ) {
158	std::cout << "untyped expr is ";
159	untyped->print( std::cout );
160	std::cout << std::endl << "alternatives are:";
161	for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
162	i->print( std::cout );
163	} // for
164	} // if
165	#endif
166	Expression *newExpr = 0;
167	const TypeEnvironment *newEnv = 0;
168	for ( AltList::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
169	if ( i->expr->get_result()->size() == 1 && isIntegralType( i->expr->get_result() ) ) {
170	if ( newExpr ) {
171	throw SemanticError( "Too many interpretations for case control expression", untyped );
172	} else {
173	newExpr = i->expr->clone();
174	newEnv = &i->env;
175	} // if
176	} // if
177	} // for
178	if ( ! newExpr ) {
179	throw SemanticError( "No interpretations for case control expression", untyped );
180	} // if
181	finishExpr( newExpr, *newEnv );
182	return newExpr;
183	}
184
185	}
186
187	void Resolver::visit( ObjectDecl *objectDecl ) {
188	Type new_type = resolveTypeof( objectDecl->get_type(), this );
189	objectDecl->set_type( new_type );
190	// To handle initialization of routine pointers, e.g., int (*fp)(int) = foo(), means that class-variable
191	// initContext is changed multiple time because the LHS is analysed twice. The second analysis changes
192	// initContext because of a function type can contain object declarations in the return and parameter types. So
193	// each value of initContext is retained, so the type on the first analysis is preserved and used for selecting
194	// the RHS.
195	ValueGuard<CurrentObject> temp( currentObject );
196	currentObject = CurrentObject( objectDecl->get_type() );
197	if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
198	// enumerator initializers should not use the enum type to initialize, since
199	// the enum type is still incomplete at this point. Use signed int instead.
200	currentObject = CurrentObject( new BasicType( Type::Qualifiers(), BasicType::SignedInt ) );
201	}
202	Parent::visit( objectDecl );
203	if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
204	// delete newly created signed int type
205	// delete currentObject.getType();
206	}
207	}
208
209	template< typename PtrType >
210	void Resolver::handlePtrType( PtrType * type ) {
211	if ( type->get_dimension() ) {
212	CastExpr *castExpr = new CastExpr( type->get_dimension(), SymTab::SizeType->clone() );
213	Expression newExpr = findSingleExpression( castExpr, this );
214	delete type->get_dimension();
215	type->set_dimension( newExpr );
216	}
217	}
218
219	void Resolver::visit( ArrayType * at ) {
220	handlePtrType( at );
221	Parent::visit( at );
222	}
223
224	void Resolver::visit( PointerType * pt ) {
225	handlePtrType( pt );
226	Parent::visit( pt );
227	}
228
229	void Resolver::visit( TypeDecl *typeDecl ) {
230	if ( typeDecl->get_base() ) {
231	Type new_type = resolveTypeof( typeDecl->get_base(), this );
232	typeDecl->set_base( new_type );
233	} // if
234	Parent::visit( typeDecl );
235	}
236
237	void Resolver::visit( FunctionDecl *functionDecl ) {
238	#if 0
239	std::cout << "resolver visiting functiondecl ";
240	functionDecl->print( std::cout );
241	std::cout << std::endl;
242	#endif
243	Type new_type = resolveTypeof( functionDecl->get_type(), this );
244	functionDecl->set_type( new_type );
245	ValueGuard< Type * > oldFunctionReturn( functionReturn );
246	functionReturn = ResolvExpr::extractResultType( functionDecl->get_functionType() );
247	Parent::visit( functionDecl );
248
249	// default value expressions have an environment which shouldn't be there and trips up later passes.
250	// xxx - it might be necessary to somehow keep the information from this environment, but I can't currently
251	// see how it's useful.
252	for ( Declaration * d : functionDecl->get_functionType()->get_parameters() ) {
253	if ( ObjectDecl * obj = dynamic_cast< ObjectDecl * >( d ) ) {
254	if ( SingleInit * init = dynamic_cast< SingleInit * >( obj->get_init() ) ) {
255	delete init->get_value()->get_env();
256	init->get_value()->set_env( nullptr );
257	}
258	}
259	}
260	}
261
262	void Resolver::visit( EnumDecl * enumDecl ) {
263	// in case we decide to allow nested enums
264	ValueGuard< bool > oldInEnumDecl( inEnumDecl );
265	inEnumDecl = true;
266	Parent::visit( enumDecl );
267	}
268
269	void Resolver::visit( ExprStmt *exprStmt ) {
270	assertf( exprStmt->get_expr(), "ExprStmt has null Expression in resolver" );
271	Expression newExpr = findVoidExpression( exprStmt->get_expr(), this );
272	delete exprStmt->get_expr();
273	exprStmt->set_expr( newExpr );
274	}
275
276	void Resolver::visit( AsmExpr *asmExpr ) {
277	Expression newExpr = findVoidExpression( asmExpr->get_operand(), this );
278	delete asmExpr->get_operand();
279	asmExpr->set_operand( newExpr );
280	if ( asmExpr->get_inout() ) {
281	newExpr = findVoidExpression( asmExpr->get_inout(), *this );
282	delete asmExpr->get_inout();
283	asmExpr->set_inout( newExpr );
284	} // if
285	}
286
287	void Resolver::visit( AsmStmt *asmStmt ) {
288	acceptAll( asmStmt->get_input(), *this);
289	acceptAll( asmStmt->get_output(), *this);
290	}
291
292	void Resolver::visit( IfStmt *ifStmt ) {
293	Expression newExpr = findSingleExpression( ifStmt->get_condition(), this );
294	delete ifStmt->get_condition();
295	ifStmt->set_condition( newExpr );
296	Parent::visit( ifStmt );
297	}
298
299	void Resolver::visit( WhileStmt *whileStmt ) {
300	Expression newExpr = findSingleExpression( whileStmt->get_condition(), this );
301	delete whileStmt->get_condition();
302	whileStmt->set_condition( newExpr );
303	Parent::visit( whileStmt );
304	}
305
306	void Resolver::visit( ForStmt *forStmt ) {
307	Parent::visit( forStmt );
308
309	if ( forStmt->get_condition() ) {
310	Expression * newExpr = findSingleExpression( forStmt->get_condition(), *this );
311	delete forStmt->get_condition();
312	forStmt->set_condition( newExpr );
313	} // if
314
315	if ( forStmt->get_increment() ) {
316	Expression * newExpr = findVoidExpression( forStmt->get_increment(), *this );
317	delete forStmt->get_increment();
318	forStmt->set_increment( newExpr );
319	} // if
320	}
321
322	void Resolver::visit( SwitchStmt *switchStmt ) {
323	ValueGuard< CurrentObject > oldCurrentObject( currentObject );
324	Expression *newExpr;
325	newExpr = findIntegralExpression( switchStmt->get_condition(), *this );
326	delete switchStmt->get_condition();
327	switchStmt->set_condition( newExpr );
328
329	currentObject = CurrentObject( newExpr->get_result() );
330	Parent::visit( switchStmt );
331	}
332
333	void Resolver::visit( CaseStmt *caseStmt ) {
334	if ( caseStmt->get_condition() ) {
335	std::list< InitAlternative > initAlts = currentObject.getOptions();
336	assertf( initAlts.size() == 1, "SwitchStmt did not correctly resolve an integral expression." );
337	CastExpr * castExpr = new CastExpr( caseStmt->get_condition(), initAlts.front().type->clone() );
338	Expression * newExpr = findSingleExpression( castExpr, *this );
339	castExpr = safe_dynamic_cast< CastExpr * >( newExpr );
340	caseStmt->set_condition( castExpr->get_arg() );
341	castExpr->set_arg( nullptr );
342	delete castExpr;
343	}
344	Parent::visit( caseStmt );
345	}
346
347	void Resolver::visit( BranchStmt *branchStmt ) {
348	// must resolve the argument for a computed goto
349	if ( branchStmt->get_type() == BranchStmt::Goto ) { // check for computed goto statement
350	if ( Expression * arg = branchStmt->get_computedTarget() ) {
351	VoidType v = Type::Qualifiers(); // cast to void * for the alternative finder
352	PointerType pt( Type::Qualifiers(), v.clone() );
353	CastExpr * castExpr = new CastExpr( arg, pt.clone() );
354	Expression * newExpr = findSingleExpression( castExpr, *this ); // find best expression
355	branchStmt->set_target( newExpr );
356	} // if
357	} // if
358	}
359
360	void Resolver::visit( ReturnStmt *returnStmt ) {
361	if ( returnStmt->get_expr() ) {
362	CastExpr *castExpr = new CastExpr( returnStmt->get_expr(), functionReturn->clone() );
363	Expression newExpr = findSingleExpression( castExpr, this );
364	delete castExpr;
365	returnStmt->set_expr( newExpr );
366	} // if
367	}
368
369	void Resolver::visit( ThrowStmt *throwStmt ) {
370	if ( throwStmt->get_expr() ) {
371	Expression * wrapped = new CastExpr( throwStmt->get_expr(), new BasicType( Type::Qualifiers(), BasicType::SignedInt ) );
372	Expression * newExpr = findSingleExpression( wrapped, *this );
373	throwStmt->set_expr( newExpr );
374	}
375	}
376
377	template< typename T >
378	bool isCharType( T t ) {
379	if ( BasicType * bt = dynamic_cast< BasicType * >( t ) ) {
380	return bt->get_kind() == BasicType::Char \|\| bt->get_kind() == BasicType::SignedChar \|\|
381	bt->get_kind() == BasicType::UnsignedChar;
382	}
383	return false;
384	}
385
386	void Resolver::visit( SingleInit *singleInit ) {
387	// resolve initialization using the possibilities as determined by the currentObject cursor
388	UntypedInitExpr * untyped = new UntypedInitExpr( singleInit->get_value(), currentObject.getOptions() );
389	Expression * newExpr = findSingleExpression( untyped, *this );
390	InitExpr * initExpr = safe_dynamic_cast< InitExpr * >( newExpr );
391
392	// move cursor to the object that is actually initialized
393	currentObject.setNext( initExpr->get_designation() );
394
395	// discard InitExpr wrapper and retain relevant pieces
396	newExpr = initExpr->get_expr();
397	newExpr->set_env( initExpr->get_env() );
398	initExpr->set_expr( nullptr );
399	initExpr->set_env( nullptr );
400	delete initExpr;
401
402	// get the actual object's type (may not exactly match what comes back from the resolver due to conversions)
403	Type * initContext = currentObject.getCurrentType();
404
405	// check if actual object's type is char[]
406	if ( ArrayType * at = dynamic_cast< ArrayType * >( initContext ) ) {
407	if ( isCharType( at->get_base() ) ) {
408	// check if the resolved type is char *
409	if ( PointerType * pt = dynamic_cast< PointerType *>( newExpr->get_result() ) ) {
410	if ( isCharType( pt->get_base() ) ) {
411	// strip cast if we're initializing a char[] with a char *, e.g. char x[] = "hello";
412	CastExpr ce = safe_dynamic_cast< CastExpr >( newExpr );
413	newExpr = ce->get_arg();
414	ce->set_arg( nullptr );
415	delete ce;
416	}
417	}
418	}
419	}
420
421	// set initializer expr to resolved express
422	singleInit->set_value( newExpr );
423
424	// move cursor to next object in preparation for next initializer
425	currentObject.increment();
426	}
427
428	void Resolver::visit( ListInit * listInit ) {
429	// move cursor into brace-enclosed initializer-list
430	currentObject.enterListInit();
431	// xxx - fix this so that the list isn't copied, iterator should be used to change current element
432	std::list<Designation *> newDesignations;
433	for ( auto p : group_iterate(listInit->get_designations(), listInit->get_initializers()) ) {
434	// iterate designations and initializers in pairs, moving the cursor to the current designated object and resolving
435	// the initializer against that object.
436	Designation * des = std::get<0>(p);
437	Initializer * init = std::get<1>(p);
438	newDesignations.push_back( currentObject.findNext( des ) );
439	init->accept( *this );
440	}
441	// set the set of 'resolved' designations and leave the brace-enclosed initializer-list
442	listInit->get_designations() = newDesignations; // xxx - memory management
443	currentObject.exitListInit();
444
445	// xxx - this part has not be folded into CurrentObject yet
446	// } else if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( initContext ) ) {
447	// Type * base = tt->get_baseType()->get_base();
448	// if ( base ) {
449	// // know the implementation type, so try using that as the initContext
450	// ObjectDecl tmpObj( "", Type::StorageClasses(), LinkageSpec::Cforall, nullptr, base->clone(), nullptr );
451	// currentObject = &tmpObj;
452	// visit( listInit );
453	// } else {
454	// // missing implementation type -- might be an unknown type variable, so try proceeding with the current init context
455	// Parent::visit( listInit );
456	// }
457	// } else {
458	}
459
460	// ConstructorInit - fall back on C-style initializer
461	void Resolver::fallbackInit( ConstructorInit * ctorInit ) {
462	// could not find valid constructor, or found an intrinsic constructor
463	// fall back on C-style initializer
464	delete ctorInit->get_ctor();
465	ctorInit->set_ctor( NULL );
466	delete ctorInit->get_dtor();
467	ctorInit->set_dtor( NULL );
468	maybeAccept( ctorInit->get_init(), *this );
469	}
470
471	// needs to be callable from outside the resolver, so this is a standalone function
472	void resolveCtorInit( ConstructorInit * ctorInit, const SymTab::Indexer & indexer ) {
473	assert( ctorInit );
474	Resolver resolver( indexer );
475	ctorInit->accept( resolver );
476	}
477
478	void resolveStmtExpr( StmtExpr * stmtExpr, const SymTab::Indexer & indexer ) {
479	assert( stmtExpr );
480	Resolver resolver( indexer );
481	stmtExpr->accept( resolver );
482	}
483
484	void Resolver::visit( ConstructorInit *ctorInit ) {
485	// xxx - fallback init has been removed => remove fallbackInit function and remove complexity from FixInit and remove C-init from ConstructorInit
486	maybeAccept( ctorInit->get_ctor(), *this );
487	maybeAccept( ctorInit->get_dtor(), *this );
488
489	// found a constructor - can get rid of C-style initializer
490	delete ctorInit->get_init();
491	ctorInit->set_init( NULL );
492
493	// intrinsic single parameter constructors and destructors do nothing. Since this was
494	// implicitly generated, there's no way for it to have side effects, so get rid of it
495	// to clean up generated code.
496	if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_ctor() ) ) {
497	delete ctorInit->get_ctor();
498	ctorInit->set_ctor( NULL );
499	}
500
501	if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_dtor() ) ) {
502	delete ctorInit->get_dtor();
503	ctorInit->set_dtor( NULL );
504	}
505
506	// xxx - todo -- what about arrays?
507	// if ( dtor == NULL && InitTweak::isIntrinsicCallStmt( ctorInit->get_ctor() ) ) {
508	// // can reduce the constructor down to a SingleInit using the
509	// // second argument from the ctor call, since
510	// delete ctorInit->get_ctor();
511	// ctorInit->set_ctor( NULL );
512
513	// Expression * arg =
514	// ctorInit->set_init( new SingleInit( arg ) );
515	// }
516	}
517	} // namespace ResolvExpr
518
519	// Local Variables: //
520	// tab-width: 4 //
521	// mode: c++ //
522	// compile-command: "make install" //
523	// End: //

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