source: src/ResolvExpr/Resolver.cc@ 8217e8f

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since 8217e8f was cbce272, checked in by Andrew Beach <ajbeach@…>, 8 years ago

Structure based exception handling.
  • Property mode set to 100644
File size: 19.2 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 : Andrew Beach
12// Last Modified On : Tus Aug 8 16:06:00 2017
13// Update Count : 212
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
38using namespace std;
39
40namespace 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 virtual void visit( CatchStmt *catchStmt ) override;
74
75 virtual void visit( SingleInit *singleInit ) override;
76 virtual void visit( ListInit *listInit ) override;
77 virtual void visit( ConstructorInit *ctorInit ) override;
78 private:
79 typedef std::list< Initializer * >::iterator InitIterator;
80
81 template< typename PtrType >
82 void handlePtrType( PtrType * type );
83
84 void resolveAggrInit( ReferenceToType *, InitIterator &, InitIterator & );
85 void resolveSingleAggrInit( Declaration *, InitIterator &, InitIterator &, TypeSubstitution sub );
86 void fallbackInit( ConstructorInit * ctorInit );
87
88 Type * functionReturn = nullptr;
89 CurrentObject currentObject = nullptr;
90 bool inEnumDecl = false;
91 };
92
93 void resolve( std::list< Declaration * > translationUnit ) {
94 Resolver resolver;
95 acceptAll( translationUnit, resolver );
96 }
97
98 Expression *resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer ) {
99 TypeEnvironment env;
100 return resolveInVoidContext( expr, indexer, env );
101 }
102
103
104 namespace {
105 void finishExpr( Expression *expr, const TypeEnvironment &env ) {
106 expr->set_env( new TypeSubstitution );
107 env.makeSubstitution( *expr->get_env() );
108 }
109 } // namespace
110
111 Expression *findVoidExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
112 global_renamer.reset();
113 TypeEnvironment env;
114 Expression *newExpr = resolveInVoidContext( untyped, indexer, env );
115 finishExpr( newExpr, env );
116 return newExpr;
117 }
118
119 namespace {
120 Expression *findSingleExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
121 TypeEnvironment env;
122 AlternativeFinder finder( indexer, env );
123 finder.find( untyped );
124#if 0
125 if ( finder.get_alternatives().size() != 1 ) {
126 std::cout << "untyped expr is ";
127 untyped->print( std::cout );
128 std::cout << std::endl << "alternatives are:";
129 for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
130 i->print( std::cout );
131 } // for
132 } // if
133#endif
134 assertf( finder.get_alternatives().size() == 1, "findSingleExpression: must have exactly one alternative at the end." );
135 Alternative &choice = finder.get_alternatives().front();
136 Expression *newExpr = choice.expr->clone();
137 finishExpr( newExpr, choice.env );
138 return newExpr;
139 }
140
141 bool isIntegralType( Type *type ) {
142 if ( dynamic_cast< EnumInstType * >( type ) ) {
143 return true;
144 } else if ( BasicType *bt = dynamic_cast< BasicType * >( type ) ) {
145 return bt->isInteger();
146 } else if ( dynamic_cast< ZeroType* >( type ) != nullptr || dynamic_cast< OneType* >( type ) != nullptr ) {
147 return true;
148 } else {
149 return false;
150 } // if
151 }
152
153 Expression *findIntegralExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
154 TypeEnvironment env;
155 AlternativeFinder finder( indexer, env );
156 finder.find( untyped );
157#if 0
158 if ( finder.get_alternatives().size() != 1 ) {
159 std::cout << "untyped expr is ";
160 untyped->print( std::cout );
161 std::cout << std::endl << "alternatives are:";
162 for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
163 i->print( std::cout );
164 } // for
165 } // if
166#endif
167 Expression *newExpr = 0;
168 const TypeEnvironment *newEnv = 0;
169 for ( AltList::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
170 if ( i->expr->get_result()->size() == 1 && isIntegralType( i->expr->get_result() ) ) {
171 if ( newExpr ) {
172 throw SemanticError( "Too many interpretations for case control expression", untyped );
173 } else {
174 newExpr = i->expr->clone();
175 newEnv = &i->env;
176 } // if
177 } // if
178 } // for
179 if ( ! newExpr ) {
180 throw SemanticError( "No interpretations for case control expression", untyped );
181 } // if
182 finishExpr( newExpr, *newEnv );
183 return newExpr;
184 }
185
186 }
187
188 void Resolver::visit( ObjectDecl *objectDecl ) {
189 Type *new_type = resolveTypeof( objectDecl->get_type(), *this );
190 objectDecl->set_type( new_type );
191 // To handle initialization of routine pointers, e.g., int (*fp)(int) = foo(), means that class-variable
192 // initContext is changed multiple time because the LHS is analysed twice. The second analysis changes
193 // initContext because of a function type can contain object declarations in the return and parameter types. So
194 // each value of initContext is retained, so the type on the first analysis is preserved and used for selecting
195 // the RHS.
196 ValueGuard<CurrentObject> temp( currentObject );
197 currentObject = CurrentObject( objectDecl->get_type() );
198 if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
199 // enumerator initializers should not use the enum type to initialize, since
200 // the enum type is still incomplete at this point. Use signed int instead.
201 currentObject = CurrentObject( new BasicType( Type::Qualifiers(), BasicType::SignedInt ) );
202 }
203 Parent::visit( objectDecl );
204 if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
205 // delete newly created signed int type
206 // delete currentObject.getType();
207 }
208 }
209
210 template< typename PtrType >
211 void Resolver::handlePtrType( PtrType * type ) {
212 if ( type->get_dimension() ) {
213 CastExpr *castExpr = new CastExpr( type->get_dimension(), SymTab::SizeType->clone() );
214 Expression *newExpr = findSingleExpression( castExpr, *this );
215 delete type->get_dimension();
216 type->set_dimension( newExpr );
217 }
218 }
219
220 void Resolver::visit( ArrayType * at ) {
221 handlePtrType( at );
222 Parent::visit( at );
223 }
224
225 void Resolver::visit( PointerType * pt ) {
226 handlePtrType( pt );
227 Parent::visit( pt );
228 }
229
230 void Resolver::visit( TypeDecl *typeDecl ) {
231 if ( typeDecl->get_base() ) {
232 Type *new_type = resolveTypeof( typeDecl->get_base(), *this );
233 typeDecl->set_base( new_type );
234 } // if
235 Parent::visit( typeDecl );
236 }
237
238 void Resolver::visit( FunctionDecl *functionDecl ) {
239#if 0
240 std::cout << "resolver visiting functiondecl ";
241 functionDecl->print( std::cout );
242 std::cout << std::endl;
243#endif
244 Type *new_type = resolveTypeof( functionDecl->get_type(), *this );
245 functionDecl->set_type( new_type );
246 ValueGuard< Type * > oldFunctionReturn( functionReturn );
247 functionReturn = ResolvExpr::extractResultType( functionDecl->get_functionType() );
248 Parent::visit( functionDecl );
249
250 // default value expressions have an environment which shouldn't be there and trips up later passes.
251 // xxx - it might be necessary to somehow keep the information from this environment, but I can't currently
252 // see how it's useful.
253 for ( Declaration * d : functionDecl->get_functionType()->get_parameters() ) {
254 if ( ObjectDecl * obj = dynamic_cast< ObjectDecl * >( d ) ) {
255 if ( SingleInit * init = dynamic_cast< SingleInit * >( obj->get_init() ) ) {
256 delete init->get_value()->get_env();
257 init->get_value()->set_env( nullptr );
258 }
259 }
260 }
261 }
262
263 void Resolver::visit( EnumDecl * enumDecl ) {
264 // in case we decide to allow nested enums
265 ValueGuard< bool > oldInEnumDecl( inEnumDecl );
266 inEnumDecl = true;
267 Parent::visit( enumDecl );
268 }
269
270 void Resolver::visit( ExprStmt *exprStmt ) {
271 assertf( exprStmt->get_expr(), "ExprStmt has null Expression in resolver" );
272 Expression *newExpr = findVoidExpression( exprStmt->get_expr(), *this );
273 delete exprStmt->get_expr();
274 exprStmt->set_expr( newExpr );
275 }
276
277 void Resolver::visit( AsmExpr *asmExpr ) {
278 Expression *newExpr = findVoidExpression( asmExpr->get_operand(), *this );
279 delete asmExpr->get_operand();
280 asmExpr->set_operand( newExpr );
281 if ( asmExpr->get_inout() ) {
282 newExpr = findVoidExpression( asmExpr->get_inout(), *this );
283 delete asmExpr->get_inout();
284 asmExpr->set_inout( newExpr );
285 } // if
286 }
287
288 void Resolver::visit( AsmStmt *asmStmt ) {
289 acceptAll( asmStmt->get_input(), *this);
290 acceptAll( asmStmt->get_output(), *this);
291 }
292
293 void Resolver::visit( IfStmt *ifStmt ) {
294 Expression *newExpr = findSingleExpression( ifStmt->get_condition(), *this );
295 delete ifStmt->get_condition();
296 ifStmt->set_condition( newExpr );
297 Parent::visit( ifStmt );
298 }
299
300 void Resolver::visit( WhileStmt *whileStmt ) {
301 Expression *newExpr = findSingleExpression( whileStmt->get_condition(), *this );
302 delete whileStmt->get_condition();
303 whileStmt->set_condition( newExpr );
304 Parent::visit( whileStmt );
305 }
306
307 void Resolver::visit( ForStmt *forStmt ) {
308 Parent::visit( forStmt );
309
310 if ( forStmt->get_condition() ) {
311 Expression * newExpr = findSingleExpression( forStmt->get_condition(), *this );
312 delete forStmt->get_condition();
313 forStmt->set_condition( newExpr );
314 } // if
315
316 if ( forStmt->get_increment() ) {
317 Expression * newExpr = findVoidExpression( forStmt->get_increment(), *this );
318 delete forStmt->get_increment();
319 forStmt->set_increment( newExpr );
320 } // if
321 }
322
323 void Resolver::visit( SwitchStmt *switchStmt ) {
324 ValueGuard< CurrentObject > oldCurrentObject( currentObject );
325 Expression *newExpr;
326 newExpr = findIntegralExpression( switchStmt->get_condition(), *this );
327 delete switchStmt->get_condition();
328 switchStmt->set_condition( newExpr );
329
330 currentObject = CurrentObject( newExpr->get_result() );
331 Parent::visit( switchStmt );
332 }
333
334 void Resolver::visit( CaseStmt *caseStmt ) {
335 if ( caseStmt->get_condition() ) {
336 std::list< InitAlternative > initAlts = currentObject.getOptions();
337 assertf( initAlts.size() == 1, "SwitchStmt did not correctly resolve an integral expression." );
338 CastExpr * castExpr = new CastExpr( caseStmt->get_condition(), initAlts.front().type->clone() );
339 Expression * newExpr = findSingleExpression( castExpr, *this );
340 castExpr = safe_dynamic_cast< CastExpr * >( newExpr );
341 caseStmt->set_condition( castExpr->get_arg() );
342 castExpr->set_arg( nullptr );
343 delete castExpr;
344 }
345 Parent::visit( caseStmt );
346 }
347
348 void Resolver::visit( BranchStmt *branchStmt ) {
349 // must resolve the argument for a computed goto
350 if ( branchStmt->get_type() == BranchStmt::Goto ) { // check for computed goto statement
351 if ( Expression * arg = branchStmt->get_computedTarget() ) {
352 VoidType v = Type::Qualifiers(); // cast to void * for the alternative finder
353 PointerType pt( Type::Qualifiers(), v.clone() );
354 CastExpr * castExpr = new CastExpr( arg, pt.clone() );
355 Expression * newExpr = findSingleExpression( castExpr, *this ); // find best expression
356 branchStmt->set_target( newExpr );
357 } // if
358 } // if
359 }
360
361 void Resolver::visit( ReturnStmt *returnStmt ) {
362 if ( returnStmt->get_expr() ) {
363 CastExpr *castExpr = new CastExpr( returnStmt->get_expr(), functionReturn->clone() );
364 Expression *newExpr = findSingleExpression( castExpr, *this );
365 delete castExpr;
366 returnStmt->set_expr( newExpr );
367 } // if
368 }
369
370 void Resolver::visit( ThrowStmt *throwStmt ) {
371 // TODO: Replace *exception type with &exception type.
372 if ( throwStmt->get_expr() ) {
373 StructDecl * exception_decl =
374 lookupStruct( "__cfaehm__base_exception_t" );
375 assert( exception_decl );
376 Expression * wrapped = new CastExpr(
377 throwStmt->get_expr(),
378 new PointerType(
379 noQualifiers,
380 new StructInstType(
381 noQualifiers,
382 exception_decl
383 )
384 )
385 );
386 Expression * newExpr = findSingleExpression( wrapped, *this );
387 throwStmt->set_expr( newExpr );
388 }
389 }
390
391 void Resolver::visit( CatchStmt *catchStmt ) {
392 if ( catchStmt->get_cond() ) {
393 Expression * wrapped = new CastExpr(
394 catchStmt->get_cond(),
395 new BasicType( noQualifiers, BasicType::Bool )
396 );
397 catchStmt->set_cond( findSingleExpression( wrapped, *this ) );
398 }
399 }
400
401 template< typename T >
402 bool isCharType( T t ) {
403 if ( BasicType * bt = dynamic_cast< BasicType * >( t ) ) {
404 return bt->get_kind() == BasicType::Char || bt->get_kind() == BasicType::SignedChar ||
405 bt->get_kind() == BasicType::UnsignedChar;
406 }
407 return false;
408 }
409
410 void Resolver::visit( SingleInit *singleInit ) {
411 // resolve initialization using the possibilities as determined by the currentObject cursor
412 UntypedInitExpr * untyped = new UntypedInitExpr( singleInit->get_value(), currentObject.getOptions() );
413 Expression * newExpr = findSingleExpression( untyped, *this );
414 InitExpr * initExpr = safe_dynamic_cast< InitExpr * >( newExpr );
415
416 // move cursor to the object that is actually initialized
417 currentObject.setNext( initExpr->get_designation() );
418
419 // discard InitExpr wrapper and retain relevant pieces
420 newExpr = initExpr->get_expr();
421 newExpr->set_env( initExpr->get_env() );
422 initExpr->set_expr( nullptr );
423 initExpr->set_env( nullptr );
424 delete initExpr;
425
426 // get the actual object's type (may not exactly match what comes back from the resolver due to conversions)
427 Type * initContext = currentObject.getCurrentType();
428
429 // check if actual object's type is char[]
430 if ( ArrayType * at = dynamic_cast< ArrayType * >( initContext ) ) {
431 if ( isCharType( at->get_base() ) ) {
432 // check if the resolved type is char *
433 if ( PointerType * pt = dynamic_cast< PointerType *>( newExpr->get_result() ) ) {
434 if ( isCharType( pt->get_base() ) ) {
435 // strip cast if we're initializing a char[] with a char *, e.g. char x[] = "hello";
436 CastExpr *ce = safe_dynamic_cast< CastExpr * >( newExpr );
437 newExpr = ce->get_arg();
438 ce->set_arg( nullptr );
439 delete ce;
440 }
441 }
442 }
443 }
444
445 // set initializer expr to resolved express
446 singleInit->set_value( newExpr );
447
448 // move cursor to next object in preparation for next initializer
449 currentObject.increment();
450 }
451
452 void Resolver::visit( ListInit * listInit ) {
453 // move cursor into brace-enclosed initializer-list
454 currentObject.enterListInit();
455 // xxx - fix this so that the list isn't copied, iterator should be used to change current element
456 std::list<Designation *> newDesignations;
457 for ( auto p : group_iterate(listInit->get_designations(), listInit->get_initializers()) ) {
458 // iterate designations and initializers in pairs, moving the cursor to the current designated object and resolving
459 // the initializer against that object.
460 Designation * des = std::get<0>(p);
461 Initializer * init = std::get<1>(p);
462 newDesignations.push_back( currentObject.findNext( des ) );
463 init->accept( *this );
464 }
465 // set the set of 'resolved' designations and leave the brace-enclosed initializer-list
466 listInit->get_designations() = newDesignations; // xxx - memory management
467 currentObject.exitListInit();
468
469 // xxx - this part has not be folded into CurrentObject yet
470 // } else if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( initContext ) ) {
471 // Type * base = tt->get_baseType()->get_base();
472 // if ( base ) {
473 // // know the implementation type, so try using that as the initContext
474 // ObjectDecl tmpObj( "", Type::StorageClasses(), LinkageSpec::Cforall, nullptr, base->clone(), nullptr );
475 // currentObject = &tmpObj;
476 // visit( listInit );
477 // } else {
478 // // missing implementation type -- might be an unknown type variable, so try proceeding with the current init context
479 // Parent::visit( listInit );
480 // }
481 // } else {
482 }
483
484 // ConstructorInit - fall back on C-style initializer
485 void Resolver::fallbackInit( ConstructorInit * ctorInit ) {
486 // could not find valid constructor, or found an intrinsic constructor
487 // fall back on C-style initializer
488 delete ctorInit->get_ctor();
489 ctorInit->set_ctor( NULL );
490 delete ctorInit->get_dtor();
491 ctorInit->set_dtor( NULL );
492 maybeAccept( ctorInit->get_init(), *this );
493 }
494
495 // needs to be callable from outside the resolver, so this is a standalone function
496 void resolveCtorInit( ConstructorInit * ctorInit, const SymTab::Indexer & indexer ) {
497 assert( ctorInit );
498 Resolver resolver( indexer );
499 ctorInit->accept( resolver );
500 }
501
502 void resolveStmtExpr( StmtExpr * stmtExpr, const SymTab::Indexer & indexer ) {
503 assert( stmtExpr );
504 Resolver resolver( indexer );
505 stmtExpr->accept( resolver );
506 }
507
508 void Resolver::visit( ConstructorInit *ctorInit ) {
509 // xxx - fallback init has been removed => remove fallbackInit function and remove complexity from FixInit and remove C-init from ConstructorInit
510 maybeAccept( ctorInit->get_ctor(), *this );
511 maybeAccept( ctorInit->get_dtor(), *this );
512
513 // found a constructor - can get rid of C-style initializer
514 delete ctorInit->get_init();
515 ctorInit->set_init( NULL );
516
517 // intrinsic single parameter constructors and destructors do nothing. Since this was
518 // implicitly generated, there's no way for it to have side effects, so get rid of it
519 // to clean up generated code.
520 if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_ctor() ) ) {
521 delete ctorInit->get_ctor();
522 ctorInit->set_ctor( NULL );
523 }
524
525 if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_dtor() ) ) {
526 delete ctorInit->get_dtor();
527 ctorInit->set_dtor( NULL );
528 }
529
530 // xxx - todo -- what about arrays?
531 // if ( dtor == NULL && InitTweak::isIntrinsicCallStmt( ctorInit->get_ctor() ) ) {
532 // // can reduce the constructor down to a SingleInit using the
533 // // second argument from the ctor call, since
534 // delete ctorInit->get_ctor();
535 // ctorInit->set_ctor( NULL );
536
537 // Expression * arg =
538 // ctorInit->set_init( new SingleInit( arg ) );
539 // }
540 }
541} // namespace ResolvExpr
542
543// Local Variables: //
544// tab-width: 4 //
545// mode: c++ //
546// compile-command: "make install" //
547// End: //
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