source: src/ResolvExpr/Resolver.cc@ 435e75f

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 435e75f was 435e75f, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

fix dropped environment
  • Property mode set to 100644
File size: 18.3 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// 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
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
73 virtual void visit( SingleInit *singleInit ) override;
74 virtual void visit( ListInit *listInit ) override;
75 virtual void visit( ConstructorInit *ctorInit ) override;
76 private:
77 typedef std::list< Initializer * >::iterator InitIterator;
78
79 template< typename PtrType >
80 void handlePtrType( PtrType * type );
81
82 void resolveAggrInit( ReferenceToType *, InitIterator &, InitIterator & );
83 void resolveSingleAggrInit( Declaration *, InitIterator &, InitIterator &, TypeSubstitution sub );
84 void fallbackInit( ConstructorInit * ctorInit );
85
86 Type * functionReturn = nullptr;
87 CurrentObject currentObject = nullptr;
88 bool inEnumDecl = false;
89 };
90
91 void resolve( std::list< Declaration * > translationUnit ) {
92 Resolver resolver;
93 acceptAll( translationUnit, resolver );
94 }
95
96 Expression *resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer ) {
97 TypeEnvironment env;
98 return resolveInVoidContext( expr, indexer, env );
99 }
100
101
102 namespace {
103 void finishExpr( Expression *expr, const TypeEnvironment &env ) {
104 expr->set_env( new TypeSubstitution );
105 env.makeSubstitution( *expr->get_env() );
106 }
107 } // namespace
108
109 Expression *findVoidExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
110 global_renamer.reset();
111 TypeEnvironment env;
112 Expression *newExpr = resolveInVoidContext( untyped, indexer, env );
113 finishExpr( newExpr, env );
114 return newExpr;
115 }
116
117 namespace {
118 Expression *findSingleExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
119 TypeEnvironment env;
120 AlternativeFinder finder( indexer, env );
121 finder.find( untyped );
122#if 0
123 if ( finder.get_alternatives().size() != 1 ) {
124 std::cout << "untyped expr is ";
125 untyped->print( std::cout );
126 std::cout << std::endl << "alternatives are:";
127 for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
128 i->print( std::cout );
129 } // for
130 } // if
131#endif
132 assertf( finder.get_alternatives().size() == 1, "findSingleExpression: must have exactly one alternative at the end." );
133 Alternative &choice = finder.get_alternatives().front();
134 Expression *newExpr = choice.expr->clone();
135 finishExpr( newExpr, choice.env );
136 return newExpr;
137 }
138
139 bool isIntegralType( Type *type ) {
140 if ( dynamic_cast< EnumInstType * >( type ) ) {
141 return true;
142 } else if ( BasicType *bt = dynamic_cast< BasicType * >( type ) ) {
143 return bt->isInteger();
144 } else if ( dynamic_cast< ZeroType* >( type ) != nullptr || dynamic_cast< OneType* >( type ) != nullptr ) {
145 return true;
146 } else {
147 return false;
148 } // if
149 }
150
151 Expression *findIntegralExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
152 TypeEnvironment env;
153 AlternativeFinder finder( indexer, env );
154 finder.find( untyped );
155#if 0
156 if ( finder.get_alternatives().size() != 1 ) {
157 std::cout << "untyped expr is ";
158 untyped->print( std::cout );
159 std::cout << std::endl << "alternatives are:";
160 for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
161 i->print( std::cout );
162 } // for
163 } // if
164#endif
165 Expression *newExpr = 0;
166 const TypeEnvironment *newEnv = 0;
167 for ( AltList::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
168 if ( i->expr->get_result()->size() == 1 && isIntegralType( i->expr->get_result() ) ) {
169 if ( newExpr ) {
170 throw SemanticError( "Too many interpretations for case control expression", untyped );
171 } else {
172 newExpr = i->expr->clone();
173 newEnv = &i->env;
174 } // if
175 } // if
176 } // for
177 if ( ! newExpr ) {
178 throw SemanticError( "No interpretations for case control expression", untyped );
179 } // if
180 finishExpr( newExpr, *newEnv );
181 return newExpr;
182 }
183
184 }
185
186 void Resolver::visit( ObjectDecl *objectDecl ) {
187 Type *new_type = resolveTypeof( objectDecl->get_type(), *this );
188 objectDecl->set_type( new_type );
189 // To handle initialization of routine pointers, e.g., int (*fp)(int) = foo(), means that class-variable
190 // initContext is changed multiple time because the LHS is analysed twice. The second analysis changes
191 // initContext because of a function type can contain object declarations in the return and parameter types. So
192 // each value of initContext is retained, so the type on the first analysis is preserved and used for selecting
193 // the RHS.
194 ValueGuard<CurrentObject> temp( currentObject );
195 currentObject = CurrentObject( objectDecl->get_type() );
196 if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
197 // enumerator initializers should not use the enum type to initialize, since
198 // the enum type is still incomplete at this point. Use signed int instead.
199 currentObject = CurrentObject( new BasicType( Type::Qualifiers(), BasicType::SignedInt ) );
200 }
201 Parent::visit( objectDecl );
202 if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
203 // delete newly created signed int type
204 // delete currentObject.getType();
205 }
206 }
207
208 template< typename PtrType >
209 void Resolver::handlePtrType( PtrType * type ) {
210 if ( type->get_dimension() ) {
211 CastExpr *castExpr = new CastExpr( type->get_dimension(), SymTab::SizeType->clone() );
212 Expression *newExpr = findSingleExpression( castExpr, *this );
213 delete type->get_dimension();
214 type->set_dimension( newExpr );
215 }
216 }
217
218 void Resolver::visit( ArrayType * at ) {
219 handlePtrType( at );
220 Parent::visit( at );
221 }
222
223 void Resolver::visit( PointerType * pt ) {
224 handlePtrType( pt );
225 Parent::visit( pt );
226 }
227
228 void Resolver::visit( TypeDecl *typeDecl ) {
229 if ( typeDecl->get_base() ) {
230 Type *new_type = resolveTypeof( typeDecl->get_base(), *this );
231 typeDecl->set_base( new_type );
232 } // if
233 Parent::visit( typeDecl );
234 }
235
236 void Resolver::visit( FunctionDecl *functionDecl ) {
237#if 0
238 std::cout << "resolver visiting functiondecl ";
239 functionDecl->print( std::cout );
240 std::cout << std::endl;
241#endif
242 Type *new_type = resolveTypeof( functionDecl->get_type(), *this );
243 functionDecl->set_type( new_type );
244 ValueGuard< Type * > oldFunctionReturn( functionReturn );
245 functionReturn = ResolvExpr::extractResultType( functionDecl->get_functionType() );
246 Parent::visit( functionDecl );
247
248 // default value expressions have an environment which shouldn't be there and trips up later passes.
249 // xxx - it might be necessary to somehow keep the information from this environment, but I can't currently
250 // see how it's useful.
251 for ( Declaration * d : functionDecl->get_functionType()->get_parameters() ) {
252 if ( ObjectDecl * obj = dynamic_cast< ObjectDecl * >( d ) ) {
253 if ( SingleInit * init = dynamic_cast< SingleInit * >( obj->get_init() ) ) {
254 delete init->get_value()->get_env();
255 init->get_value()->set_env( nullptr );
256 }
257 }
258 }
259 }
260
261 void Resolver::visit( EnumDecl * enumDecl ) {
262 // in case we decide to allow nested enums
263 ValueGuard< bool > oldInEnumDecl( inEnumDecl );
264 inEnumDecl = true;
265 Parent::visit( enumDecl );
266 }
267
268 void Resolver::visit( ExprStmt *exprStmt ) {
269 assertf( exprStmt->get_expr(), "ExprStmt has null Expression in resolver" );
270 Expression *newExpr = findVoidExpression( exprStmt->get_expr(), *this );
271 delete exprStmt->get_expr();
272 exprStmt->set_expr( newExpr );
273 }
274
275 void Resolver::visit( AsmExpr *asmExpr ) {
276 Expression *newExpr = findVoidExpression( asmExpr->get_operand(), *this );
277 delete asmExpr->get_operand();
278 asmExpr->set_operand( newExpr );
279 if ( asmExpr->get_inout() ) {
280 newExpr = findVoidExpression( asmExpr->get_inout(), *this );
281 delete asmExpr->get_inout();
282 asmExpr->set_inout( newExpr );
283 } // if
284 }
285
286 void Resolver::visit( AsmStmt *asmStmt ) {
287 acceptAll( asmStmt->get_input(), *this);
288 acceptAll( asmStmt->get_output(), *this);
289 }
290
291 void Resolver::visit( IfStmt *ifStmt ) {
292 Expression *newExpr = findSingleExpression( ifStmt->get_condition(), *this );
293 delete ifStmt->get_condition();
294 ifStmt->set_condition( newExpr );
295 Parent::visit( ifStmt );
296 }
297
298 void Resolver::visit( WhileStmt *whileStmt ) {
299 Expression *newExpr = findSingleExpression( whileStmt->get_condition(), *this );
300 delete whileStmt->get_condition();
301 whileStmt->set_condition( newExpr );
302 Parent::visit( whileStmt );
303 }
304
305 void Resolver::visit( ForStmt *forStmt ) {
306 Parent::visit( forStmt );
307
308 if ( forStmt->get_condition() ) {
309 Expression * newExpr = findSingleExpression( forStmt->get_condition(), *this );
310 delete forStmt->get_condition();
311 forStmt->set_condition( newExpr );
312 } // if
313
314 if ( forStmt->get_increment() ) {
315 Expression * newExpr = findVoidExpression( forStmt->get_increment(), *this );
316 delete forStmt->get_increment();
317 forStmt->set_increment( newExpr );
318 } // if
319 }
320
321 void Resolver::visit( SwitchStmt *switchStmt ) {
322 ValueGuard< CurrentObject > oldCurrentObject( currentObject );
323 Expression *newExpr;
324 newExpr = findIntegralExpression( switchStmt->get_condition(), *this );
325 delete switchStmt->get_condition();
326 switchStmt->set_condition( newExpr );
327
328 currentObject = CurrentObject( newExpr->get_result() );
329 Parent::visit( switchStmt );
330 }
331
332 void Resolver::visit( CaseStmt *caseStmt ) {
333 if ( caseStmt->get_condition() ) {
334 std::list< InitAlternative > initAlts = currentObject.getOptions();
335 assertf( initAlts.size() == 1, "SwitchStmt did not correctly resolve an integral expression." );
336 CastExpr * castExpr = new CastExpr( caseStmt->get_condition(), initAlts.front().type->clone() );
337 Expression * newExpr = findSingleExpression( castExpr, *this );
338 castExpr = safe_dynamic_cast< CastExpr * >( newExpr );
339 caseStmt->set_condition( castExpr->get_arg() );
340 castExpr->set_arg( nullptr );
341 delete castExpr;
342 }
343 Parent::visit( caseStmt );
344 }
345
346 void Resolver::visit( BranchStmt *branchStmt ) {
347 // must resolve the argument for a computed goto
348 if ( branchStmt->get_type() == BranchStmt::Goto ) { // check for computed goto statement
349 if ( Expression * arg = branchStmt->get_computedTarget() ) {
350 VoidType v = Type::Qualifiers(); // cast to void * for the alternative finder
351 PointerType pt( Type::Qualifiers(), v.clone() );
352 CastExpr * castExpr = new CastExpr( arg, pt.clone() );
353 Expression * newExpr = findSingleExpression( castExpr, *this ); // find best expression
354 branchStmt->set_target( newExpr );
355 } // if
356 } // if
357 }
358
359 void Resolver::visit( ReturnStmt *returnStmt ) {
360 if ( returnStmt->get_expr() ) {
361 CastExpr *castExpr = new CastExpr( returnStmt->get_expr(), functionReturn->clone() );
362 Expression *newExpr = findSingleExpression( castExpr, *this );
363 delete castExpr;
364 returnStmt->set_expr( newExpr );
365 } // if
366 }
367
368 template< typename T >
369 bool isCharType( T t ) {
370 if ( BasicType * bt = dynamic_cast< BasicType * >( t ) ) {
371 return bt->get_kind() == BasicType::Char || bt->get_kind() == BasicType::SignedChar ||
372 bt->get_kind() == BasicType::UnsignedChar;
373 }
374 return false;
375 }
376
377 void Resolver::visit( SingleInit *singleInit ) {
378 // resolve initialization using the possibilities as determined by the currentObject cursor
379 UntypedInitExpr * untyped = new UntypedInitExpr( singleInit->get_value(), currentObject.getOptions() );
380 Expression * newExpr = findSingleExpression( untyped, *this );
381 InitExpr * initExpr = safe_dynamic_cast< InitExpr * >( newExpr );
382
383 // move cursor to the object that is actually initialized
384 currentObject.setNext( initExpr->get_designation() );
385
386 // discard InitExpr wrapper and retain relevant pieces
387 newExpr = initExpr->get_expr();
388 newExpr->set_env( initExpr->get_env() );
389 initExpr->set_expr( nullptr );
390 initExpr->set_env( nullptr );
391 delete initExpr;
392
393 // get the actual object's type (may not exactly match what comes back from the resolver due to conversions)
394 Type * initContext = currentObject.getCurrentType();
395
396 // check if actual object's type is char[]
397 if ( ArrayType * at = dynamic_cast< ArrayType * >( initContext ) ) {
398 if ( isCharType( at->get_base() ) ) {
399 // check if the resolved type is char *
400 if ( PointerType * pt = dynamic_cast< PointerType *>( newExpr->get_result() ) ) {
401 if ( isCharType( pt->get_base() ) ) {
402 // strip cast if we're initializing a char[] with a char *, e.g. char x[] = "hello";
403 CastExpr *ce = safe_dynamic_cast< CastExpr * >( newExpr );
404 newExpr = ce->get_arg();
405 ce->set_arg( nullptr );
406 delete ce;
407 }
408 }
409 }
410 }
411
412 // set initializer expr to resolved express
413 singleInit->set_value( newExpr );
414
415 // move cursor to next object in preparation for next initializer
416 currentObject.increment();
417 }
418
419 void Resolver::visit( ListInit * listInit ) {
420 // move cursor into brace-enclosed initializer-list
421 currentObject.enterListInit();
422 // xxx - fix this so that the list isn't copied, iterator should be used to change current element
423 std::list<Designation *> newDesignations;
424 for ( auto p : group_iterate(listInit->get_designations(), listInit->get_initializers()) ) {
425 // iterate designations and initializers in pairs, moving the cursor to the current designated object and resolving
426 // the initializer against that object.
427 Designation * des = std::get<0>(p);
428 Initializer * init = std::get<1>(p);
429 newDesignations.push_back( currentObject.findNext( des ) );
430 init->accept( *this );
431 }
432 // set the set of 'resolved' designations and leave the brace-enclosed initializer-list
433 listInit->get_designations() = newDesignations; // xxx - memory management
434 currentObject.exitListInit();
435
436 // xxx - this part has not be folded into CurrentObject yet
437 // } else if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( initContext ) ) {
438 // Type * base = tt->get_baseType()->get_base();
439 // if ( base ) {
440 // // know the implementation type, so try using that as the initContext
441 // ObjectDecl tmpObj( "", Type::StorageClasses(), LinkageSpec::Cforall, nullptr, base->clone(), nullptr );
442 // currentObject = &tmpObj;
443 // visit( listInit );
444 // } else {
445 // // missing implementation type -- might be an unknown type variable, so try proceeding with the current init context
446 // Parent::visit( listInit );
447 // }
448 // } else {
449 }
450
451 // ConstructorInit - fall back on C-style initializer
452 void Resolver::fallbackInit( ConstructorInit * ctorInit ) {
453 // could not find valid constructor, or found an intrinsic constructor
454 // fall back on C-style initializer
455 delete ctorInit->get_ctor();
456 ctorInit->set_ctor( NULL );
457 delete ctorInit->get_dtor();
458 ctorInit->set_dtor( NULL );
459 maybeAccept( ctorInit->get_init(), *this );
460 }
461
462 // needs to be callable from outside the resolver, so this is a standalone function
463 void resolveCtorInit( ConstructorInit * ctorInit, const SymTab::Indexer & indexer ) {
464 assert( ctorInit );
465 Resolver resolver( indexer );
466 ctorInit->accept( resolver );
467 }
468
469 void resolveStmtExpr( StmtExpr * stmtExpr, const SymTab::Indexer & indexer ) {
470 assert( stmtExpr );
471 Resolver resolver( indexer );
472 stmtExpr->accept( resolver );
473 }
474
475 void Resolver::visit( ConstructorInit *ctorInit ) {
476 // xxx - fallback init has been removed => remove fallbackInit function and remove complexity from FixInit and remove C-init from ConstructorInit
477 maybeAccept( ctorInit->get_ctor(), *this );
478 maybeAccept( ctorInit->get_dtor(), *this );
479
480 // found a constructor - can get rid of C-style initializer
481 delete ctorInit->get_init();
482 ctorInit->set_init( NULL );
483
484 // intrinsic single parameter constructors and destructors do nothing. Since this was
485 // implicitly generated, there's no way for it to have side effects, so get rid of it
486 // to clean up generated code.
487 if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_ctor() ) ) {
488 delete ctorInit->get_ctor();
489 ctorInit->set_ctor( NULL );
490 }
491
492 if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->get_dtor() ) ) {
493 delete ctorInit->get_dtor();
494 ctorInit->set_dtor( NULL );
495 }
496
497 // xxx - todo -- what about arrays?
498 // if ( dtor == NULL && InitTweak::isIntrinsicCallStmt( ctorInit->get_ctor() ) ) {
499 // // can reduce the constructor down to a SingleInit using the
500 // // second argument from the ctor call, since
501 // delete ctorInit->get_ctor();
502 // ctorInit->set_ctor( NULL );
503
504 // Expression * arg =
505 // ctorInit->set_init( new SingleInit( arg ) );
506 // }
507 }
508} // namespace ResolvExpr
509
510// Local Variables: //
511// tab-width: 4 //
512// mode: c++ //
513// compile-command: "make install" //
514// End: //
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