source: src/ResolvExpr/AlternativeFinder.cc@ 5fda7143

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors ctor 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 5fda7143 was 85517ddb, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

resolve typeof in cast expressions, update typeof test
  • Property mode set to 100644
File size: 42.4 KB
RevLine 
[a32b204]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//
[6ed1d4b]7// AlternativeFinder.cc --
[a32b204]8//
9// Author : Richard C. Bilson
10// Created On : Sat May 16 23:52:08 2015
[e04ef3a]11// Last Modified By : Peter A. Buhr
[8e9cbb2]12// Last Modified On : Mon Jul 4 17:02:51 2016
13// Update Count : 29
[a32b204]14//
15
[51b73452]16#include <list>
17#include <iterator>
18#include <algorithm>
19#include <functional>
20#include <cassert>
[ebf5689]21#include <unordered_map>
22#include <utility>
23#include <vector>
[51b73452]24
25#include "AlternativeFinder.h"
26#include "Alternative.h"
27#include "Cost.h"
28#include "typeops.h"
29#include "Unify.h"
30#include "RenameVars.h"
31#include "SynTree/Type.h"
32#include "SynTree/Declaration.h"
33#include "SynTree/Expression.h"
34#include "SynTree/Initializer.h"
35#include "SynTree/Visitor.h"
36#include "SymTab/Indexer.h"
37#include "SymTab/Mangler.h"
38#include "SynTree/TypeSubstitution.h"
39#include "SymTab/Validate.h"
40#include "Tuples/TupleAssignment.h"
41#include "Tuples/NameMatcher.h"
[d3b7937]42#include "Common/utility.h"
[70f89d00]43#include "InitTweak/InitTweak.h"
[85517ddb]44#include "ResolveTypeof.h"
[51b73452]45
[b87a5ed]46extern bool resolvep;
[6ed1d4b]47#define PRINT( text ) if ( resolvep ) { text }
[51b73452]48//#define DEBUG_COST
49
50namespace ResolvExpr {
[a32b204]51 Expression *resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer, TypeEnvironment &env ) {
52 CastExpr *castToVoid = new CastExpr( expr );
53
54 AlternativeFinder finder( indexer, env );
55 finder.findWithAdjustment( castToVoid );
56
57 // it's a property of the language that a cast expression has either 1 or 0 interpretations; if it has 0
58 // interpretations, an exception has already been thrown.
59 assert( finder.get_alternatives().size() == 1 );
60 CastExpr *newExpr = dynamic_cast< CastExpr* >( finder.get_alternatives().front().expr );
61 assert( newExpr );
62 env = finder.get_alternatives().front().env;
63 return newExpr->get_arg()->clone();
64 }
65
66 namespace {
67 void printAlts( const AltList &list, std::ostream &os, int indent = 0 ) {
68 for ( AltList::const_iterator i = list.begin(); i != list.end(); ++i ) {
69 i->print( os, indent );
70 os << std::endl;
71 }
72 }
[d9a0e76]73
[a32b204]74 void makeExprList( const AltList &in, std::list< Expression* > &out ) {
75 for ( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) {
76 out.push_back( i->expr->clone() );
77 }
78 }
[d9a0e76]79
[a32b204]80 Cost sumCost( const AltList &in ) {
81 Cost total;
82 for ( AltList::const_iterator i = in.begin(); i != in.end(); ++i ) {
83 total += i->cost;
84 }
85 return total;
86 }
[d9a0e76]87
[a32b204]88 struct PruneStruct {
89 bool isAmbiguous;
90 AltList::iterator candidate;
91 PruneStruct() {}
92 PruneStruct( AltList::iterator candidate ): isAmbiguous( false ), candidate( candidate ) {}
93 };
94
[0f19d763]95 /// Prunes a list of alternatives down to those that have the minimum conversion cost for a given return type; skips ambiguous interpretations
[a32b204]96 template< typename InputIterator, typename OutputIterator >
97 void pruneAlternatives( InputIterator begin, InputIterator end, OutputIterator out, const SymTab::Indexer &indexer ) {
98 // select the alternatives that have the minimum conversion cost for a particular set of result types
99 std::map< std::string, PruneStruct > selected;
100 for ( AltList::iterator candidate = begin; candidate != end; ++candidate ) {
101 PruneStruct current( candidate );
102 std::string mangleName;
103 for ( std::list< Type* >::const_iterator retType = candidate->expr->get_results().begin(); retType != candidate->expr->get_results().end(); ++retType ) {
104 Type *newType = (*retType)->clone();
105 candidate->env.apply( newType );
106 mangleName += SymTab::Mangler::mangle( newType );
107 delete newType;
108 }
109 std::map< std::string, PruneStruct >::iterator mapPlace = selected.find( mangleName );
110 if ( mapPlace != selected.end() ) {
111 if ( candidate->cost < mapPlace->second.candidate->cost ) {
112 PRINT(
[6ed1d4b]113 std::cerr << "cost " << candidate->cost << " beats " << mapPlace->second.candidate->cost << std::endl;
[7c64920]114 )
[0f19d763]115 selected[ mangleName ] = current;
[a32b204]116 } else if ( candidate->cost == mapPlace->second.candidate->cost ) {
117 PRINT(
[6ed1d4b]118 std::cerr << "marking ambiguous" << std::endl;
[7c64920]119 )
[0f19d763]120 mapPlace->second.isAmbiguous = true;
[a32b204]121 }
122 } else {
123 selected[ mangleName ] = current;
124 }
125 }
[d9a0e76]126
127 PRINT(
[6ed1d4b]128 std::cerr << "there are " << selected.size() << " alternatives before elimination" << std::endl;
[7c64920]129 )
[a32b204]130
[0f19d763]131 // accept the alternatives that were unambiguous
132 for ( std::map< std::string, PruneStruct >::iterator target = selected.begin(); target != selected.end(); ++target ) {
133 if ( ! target->second.isAmbiguous ) {
134 Alternative &alt = *target->second.candidate;
135 for ( std::list< Type* >::iterator result = alt.expr->get_results().begin(); result != alt.expr->get_results().end(); ++result ) {
136 alt.env.applyFree( *result );
[a32b204]137 }
[0f19d763]138 *out++ = alt;
[a32b204]139 }
[0f19d763]140 }
[a32b204]141
[d9a0e76]142 }
[a32b204]143
144 template< typename InputIterator, typename OutputIterator >
145 void findMinCost( InputIterator begin, InputIterator end, OutputIterator out ) {
146 AltList alternatives;
147
148 // select the alternatives that have the minimum parameter cost
149 Cost minCost = Cost::infinity;
150 for ( AltList::iterator i = begin; i != end; ++i ) {
151 if ( i->cost < minCost ) {
152 minCost = i->cost;
153 i->cost = i->cvtCost;
154 alternatives.clear();
155 alternatives.push_back( *i );
156 } else if ( i->cost == minCost ) {
157 i->cost = i->cvtCost;
158 alternatives.push_back( *i );
159 }
160 }
161 std::copy( alternatives.begin(), alternatives.end(), out );
[d9a0e76]162 }
163
[a32b204]164 template< typename InputIterator >
165 void simpleCombineEnvironments( InputIterator begin, InputIterator end, TypeEnvironment &result ) {
166 while ( begin != end ) {
167 result.simpleCombine( (*begin++).env );
168 }
169 }
[d9a0e76]170
[a32b204]171 void renameTypes( Expression *expr ) {
172 for ( std::list< Type* >::iterator i = expr->get_results().begin(); i != expr->get_results().end(); ++i ) {
173 (*i)->accept( global_renamer );
174 }
[d9a0e76]175 }
176 }
177
[a32b204]178 template< typename InputIterator, typename OutputIterator >
179 void AlternativeFinder::findSubExprs( InputIterator begin, InputIterator end, OutputIterator out ) {
180 while ( begin != end ) {
181 AlternativeFinder finder( indexer, env );
182 finder.findWithAdjustment( *begin );
183 // XXX either this
184 //Designators::fixDesignations( finder, (*begin++)->get_argName() );
185 // or XXX this
186 begin++;
187 PRINT(
[6ed1d4b]188 std::cerr << "findSubExprs" << std::endl;
189 printAlts( finder.alternatives, std::cerr );
[7c64920]190 )
[0f19d763]191 *out++ = finder;
[a32b204]192 }
[d9a0e76]193 }
194
[a32b204]195 AlternativeFinder::AlternativeFinder( const SymTab::Indexer &indexer, const TypeEnvironment &env )
196 : indexer( indexer ), env( env ) {
[d9a0e76]197 }
[51b73452]198
[a32b204]199 void AlternativeFinder::find( Expression *expr, bool adjust ) {
200 expr->accept( *this );
201 if ( alternatives.empty() ) {
202 throw SemanticError( "No reasonable alternatives for expression ", expr );
203 }
204 for ( AltList::iterator i = alternatives.begin(); i != alternatives.end(); ++i ) {
205 if ( adjust ) {
206 adjustExprTypeList( i->expr->get_results().begin(), i->expr->get_results().end(), i->env, indexer );
207 }
208 }
209 PRINT(
[6ed1d4b]210 std::cerr << "alternatives before prune:" << std::endl;
211 printAlts( alternatives, std::cerr );
[7c64920]212 )
[0f19d763]213 AltList::iterator oldBegin = alternatives.begin();
[a32b204]214 pruneAlternatives( alternatives.begin(), alternatives.end(), front_inserter( alternatives ), indexer );
215 if ( alternatives.begin() == oldBegin ) {
[5f2f2d7]216 std::ostringstream stream;
[a32b204]217 stream << "Can't choose between alternatives for expression ";
218 expr->print( stream );
219 stream << "Alternatives are:";
220 AltList winners;
221 findMinCost( alternatives.begin(), alternatives.end(), back_inserter( winners ) );
222 printAlts( winners, stream, 8 );
[5f2f2d7]223 throw SemanticError( stream.str() );
[a32b204]224 }
225 alternatives.erase( oldBegin, alternatives.end() );
226 PRINT(
[6ed1d4b]227 std::cerr << "there are " << alternatives.size() << " alternatives after elimination" << std::endl;
[7c64920]228 )
[8e9cbb2]229
230 // Central location to handle gcc extension keyword for all expression types.
231 for ( Alternative &iter: alternatives ) {
232 iter.expr->set_extension( expr->get_extension() );
233 } // for
[0f19d763]234 }
[d9a0e76]235
[a32b204]236 void AlternativeFinder::findWithAdjustment( Expression *expr ) {
237 find( expr, true );
[d9a0e76]238 }
[a32b204]239
240 template< typename StructOrUnionType >
241 void AlternativeFinder::addAggMembers( StructOrUnionType *aggInst, Expression *expr, const Cost &newCost, const std::string &name ) {
242 std::list< Declaration* > members;
243 aggInst->lookup( name, members );
244 for ( std::list< Declaration* >::const_iterator i = members.begin(); i != members.end(); ++i ) {
245 if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i ) ) {
[79970ed]246 alternatives.push_back( Alternative( new MemberExpr( dwt, expr->clone() ), env, newCost ) );
[a32b204]247 renameTypes( alternatives.back().expr );
248 } else {
249 assert( false );
250 }
251 }
[d9a0e76]252 }
[a32b204]253
254 void AlternativeFinder::visit( ApplicationExpr *applicationExpr ) {
255 alternatives.push_back( Alternative( applicationExpr->clone(), env, Cost::zero ) );
[d9a0e76]256 }
257
[a32b204]258 Cost computeConversionCost( Alternative &alt, const SymTab::Indexer &indexer ) {
259 ApplicationExpr *appExpr = dynamic_cast< ApplicationExpr* >( alt.expr );
260 assert( appExpr );
261 PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() );
262 assert( pointer );
263 FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() );
264 assert( function );
265
266 Cost convCost( 0, 0, 0 );
267 std::list< DeclarationWithType* >& formals = function->get_parameters();
268 std::list< DeclarationWithType* >::iterator formal = formals.begin();
269 std::list< Expression* >& actuals = appExpr->get_args();
270 for ( std::list< Expression* >::iterator actualExpr = actuals.begin(); actualExpr != actuals.end(); ++actualExpr ) {
271 PRINT(
[6ed1d4b]272 std::cerr << "actual expression:" << std::endl;
273 (*actualExpr)->print( std::cerr, 8 );
274 std::cerr << "--- results are" << std::endl;
275 printAll( (*actualExpr)->get_results(), std::cerr, 8 );
[7c64920]276 )
277 std::list< DeclarationWithType* >::iterator startFormal = formal;
[a32b204]278 Cost actualCost;
279 for ( std::list< Type* >::iterator actual = (*actualExpr)->get_results().begin(); actual != (*actualExpr)->get_results().end(); ++actual ) {
280 if ( formal == formals.end() ) {
281 if ( function->get_isVarArgs() ) {
282 convCost += Cost( 1, 0, 0 );
283 break;
284 } else {
285 return Cost::infinity;
286 }
287 }
288 PRINT(
[6ed1d4b]289 std::cerr << std::endl << "converting ";
290 (*actual)->print( std::cerr, 8 );
291 std::cerr << std::endl << " to ";
292 (*formal)->get_type()->print( std::cerr, 8 );
[7c64920]293 )
294 Cost newCost = conversionCost( *actual, (*formal)->get_type(), indexer, alt.env );
[a32b204]295 PRINT(
[6ed1d4b]296 std::cerr << std::endl << "cost is" << newCost << std::endl;
[7c64920]297 )
[a32b204]298
[7c64920]299 if ( newCost == Cost::infinity ) {
300 return newCost;
301 }
[a32b204]302 convCost += newCost;
303 actualCost += newCost;
304
305 convCost += Cost( 0, polyCost( (*formal)->get_type(), alt.env, indexer ) + polyCost( *actual, alt.env, indexer ), 0 );
306
307 formal++;
308 }
309 if ( actualCost != Cost( 0, 0, 0 ) ) {
310 std::list< DeclarationWithType* >::iterator startFormalPlusOne = startFormal;
311 startFormalPlusOne++;
312 if ( formal == startFormalPlusOne ) {
313 // not a tuple type
314 Type *newType = (*startFormal)->get_type()->clone();
315 alt.env.apply( newType );
316 *actualExpr = new CastExpr( *actualExpr, newType );
317 } else {
318 TupleType *newType = new TupleType( Type::Qualifiers() );
319 for ( std::list< DeclarationWithType* >::iterator i = startFormal; i != formal; ++i ) {
320 newType->get_types().push_back( (*i)->get_type()->clone() );
321 }
322 alt.env.apply( newType );
323 *actualExpr = new CastExpr( *actualExpr, newType );
324 }
325 }
326
[d9a0e76]327 }
[a32b204]328 if ( formal != formals.end() ) {
329 return Cost::infinity;
[d9a0e76]330 }
331
[a32b204]332 for ( InferredParams::const_iterator assert = appExpr->get_inferParams().begin(); assert != appExpr->get_inferParams().end(); ++assert ) {
333 PRINT(
[6ed1d4b]334 std::cerr << std::endl << "converting ";
335 assert->second.actualType->print( std::cerr, 8 );
336 std::cerr << std::endl << " to ";
337 assert->second.formalType->print( std::cerr, 8 );
[a32b204]338 )
339 Cost newCost = conversionCost( assert->second.actualType, assert->second.formalType, indexer, alt.env );
340 PRINT(
[6ed1d4b]341 std::cerr << std::endl << "cost of conversion is " << newCost << std::endl;
[a32b204]342 )
343 if ( newCost == Cost::infinity ) {
344 return newCost;
345 }
346 convCost += newCost;
[d9a0e76]347
[a32b204]348 convCost += Cost( 0, polyCost( assert->second.formalType, alt.env, indexer ) + polyCost( assert->second.actualType, alt.env, indexer ), 0 );
349 }
[d9a0e76]350
[a32b204]351 return convCost;
352 }
[d9a0e76]353
[8c84ebd]354 /// Adds type variables to the open variable set and marks their assertions
[a32b204]355 void makeUnifiableVars( Type *type, OpenVarSet &unifiableVars, AssertionSet &needAssertions ) {
356 for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) {
357 unifiableVars[ (*tyvar)->get_name() ] = (*tyvar)->get_kind();
358 for ( std::list< DeclarationWithType* >::iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) {
359 needAssertions[ *assert ] = true;
360 }
[d9a0e76]361/// needAssertions.insert( needAssertions.end(), (*tyvar)->get_assertions().begin(), (*tyvar)->get_assertions().end() );
362 }
363 }
[a32b204]364
365 bool AlternativeFinder::instantiateFunction( std::list< DeclarationWithType* >& formals, /*const*/ AltList &actuals, bool isVarArgs, OpenVarSet& openVars, TypeEnvironment &resultEnv, AssertionSet &resultNeed, AssertionSet &resultHave ) {
366 simpleCombineEnvironments( actuals.begin(), actuals.end(), resultEnv );
367 // make sure we don't widen any existing bindings
368 for ( TypeEnvironment::iterator i = resultEnv.begin(); i != resultEnv.end(); ++i ) {
369 i->allowWidening = false;
370 }
371 resultEnv.extractOpenVars( openVars );
372
373 /*
374 Tuples::NameMatcher matcher( formals );
375 try {
376 matcher.match( actuals );
377 } catch ( Tuples::NoMatch &e ) {
378 std::cerr << "Alternative doesn't match: " << e.message << std::endl;
379 }
380 */
381 std::list< DeclarationWithType* >::iterator formal = formals.begin();
382 for ( AltList::const_iterator actualExpr = actuals.begin(); actualExpr != actuals.end(); ++actualExpr ) {
383 for ( std::list< Type* >::iterator actual = actualExpr->expr->get_results().begin(); actual != actualExpr->expr->get_results().end(); ++actual ) {
384 if ( formal == formals.end() ) {
385 return isVarArgs;
386 }
387 PRINT(
388 std::cerr << "formal type is ";
389 (*formal)->get_type()->print( std::cerr );
390 std::cerr << std::endl << "actual type is ";
391 (*actual)->print( std::cerr );
392 std::cerr << std::endl;
[7c64920]393 )
[0f19d763]394 if ( ! unify( (*formal)->get_type(), *actual, resultEnv, resultNeed, resultHave, openVars, indexer ) ) {
395 return false;
396 }
[d9a0e76]397 formal++;
[a32b204]398 }
399 }
400 // Handling of default values
401 while ( formal != formals.end() ) {
402 if ( ObjectDecl *od = dynamic_cast<ObjectDecl *>( *formal ) )
403 if ( SingleInit *si = dynamic_cast<SingleInit *>( od->get_init() ))
404 // so far, only constant expressions are accepted as default values
405 if ( ConstantExpr *cnstexpr = dynamic_cast<ConstantExpr *>( si->get_value()) )
406 if ( Constant *cnst = dynamic_cast<Constant *>( cnstexpr->get_constant() ) )
407 if ( unify( (*formal)->get_type(), cnst->get_type(), resultEnv, resultNeed, resultHave, openVars, indexer ) ) {
408 // XXX Don't know if this is right
409 actuals.push_back( Alternative( cnstexpr->clone(), env, Cost::zero ) );
410 formal++;
411 if ( formal == formals.end()) break;
412 }
413 return false;
414 }
415 return true;
[d9a0e76]416 }
[51b73452]417
[89b686a]418 // /// Map of declaration uniqueIds (intended to be the assertions in an AssertionSet) to their parents and the number of times they've been included
419 //typedef std::unordered_map< UniqueId, std::unordered_map< UniqueId, unsigned > > AssertionParentSet;
[79970ed]420
[a1d7679]421 static const int recursionLimit = /*10*/ 4; ///< Limit to depth of recursion satisfaction
[89b686a]422 //static const unsigned recursionParentLimit = 1; ///< Limit to the number of times an assertion can recursively use itself
[51b73452]423
[a32b204]424 void addToIndexer( AssertionSet &assertSet, SymTab::Indexer &indexer ) {
425 for ( AssertionSet::iterator i = assertSet.begin(); i != assertSet.end(); ++i ) {
426 if ( i->second == true ) {
427 i->first->accept( indexer );
428 }
429 }
[d9a0e76]430 }
[79970ed]431
[a32b204]432 template< typename ForwardIterator, typename OutputIterator >
[79970ed]433 void inferRecursive( ForwardIterator begin, ForwardIterator end, const Alternative &newAlt, OpenVarSet &openVars, const SymTab::Indexer &decls, const AssertionSet &newNeed, /*const AssertionParentSet &needParents,*/
[ebf5689]434 int level, const SymTab::Indexer &indexer, OutputIterator out ) {
[a32b204]435 if ( begin == end ) {
436 if ( newNeed.empty() ) {
437 *out++ = newAlt;
438 return;
439 } else if ( level >= recursionLimit ) {
440 throw SemanticError( "Too many recursive assertions" );
441 } else {
442 AssertionSet newerNeed;
443 PRINT(
444 std::cerr << "recursing with new set:" << std::endl;
445 printAssertionSet( newNeed, std::cerr, 8 );
[7c64920]446 )
[89b686a]447 inferRecursive( newNeed.begin(), newNeed.end(), newAlt, openVars, decls, newerNeed, /*needParents,*/ level+1, indexer, out );
[a32b204]448 return;
449 }
450 }
451
452 ForwardIterator cur = begin++;
453 if ( ! cur->second ) {
[89b686a]454 inferRecursive( begin, end, newAlt, openVars, decls, newNeed, /*needParents,*/ level, indexer, out );
[a32b204]455 }
456 DeclarationWithType *curDecl = cur->first;
[d9a0e76]457 PRINT(
[a32b204]458 std::cerr << "inferRecursive: assertion is ";
459 curDecl->print( std::cerr );
460 std::cerr << std::endl;
[7c64920]461 )
[0f19d763]462 std::list< DeclarationWithType* > candidates;
[a32b204]463 decls.lookupId( curDecl->get_name(), candidates );
[6ed1d4b]464/// if ( candidates.empty() ) { std::cerr << "no candidates!" << std::endl; }
[a32b204]465 for ( std::list< DeclarationWithType* >::const_iterator candidate = candidates.begin(); candidate != candidates.end(); ++candidate ) {
466 PRINT(
[6ed1d4b]467 std::cerr << "inferRecursive: candidate is ";
468 (*candidate)->print( std::cerr );
469 std::cerr << std::endl;
[7c64920]470 )
[79970ed]471
[0f19d763]472 AssertionSet newHave, newerNeed( newNeed );
[a32b204]473 TypeEnvironment newEnv( newAlt.env );
474 OpenVarSet newOpenVars( openVars );
475 Type *adjType = (*candidate)->get_type()->clone();
476 adjustExprType( adjType, newEnv, indexer );
477 adjType->accept( global_renamer );
478 PRINT(
479 std::cerr << "unifying ";
480 curDecl->get_type()->print( std::cerr );
481 std::cerr << " with ";
482 adjType->print( std::cerr );
483 std::cerr << std::endl;
[7c64920]484 )
[0f19d763]485 if ( unify( curDecl->get_type(), adjType, newEnv, newerNeed, newHave, newOpenVars, indexer ) ) {
486 PRINT(
487 std::cerr << "success!" << std::endl;
[a32b204]488 )
[0f19d763]489 SymTab::Indexer newDecls( decls );
490 addToIndexer( newHave, newDecls );
491 Alternative newerAlt( newAlt );
492 newerAlt.env = newEnv;
493 assert( (*candidate)->get_uniqueId() );
[22cad76]494 DeclarationWithType *candDecl = static_cast< DeclarationWithType* >( Declaration::declFromId( (*candidate)->get_uniqueId() ) );
[89b686a]495 //AssertionParentSet newNeedParents( needParents );
[22cad76]496 // skip repeatingly-self-recursive assertion satisfaction
[89b686a]497 // DOESN'T WORK: grandchild nodes conflict with their cousins
498 //if ( newNeedParents[ curDecl->get_uniqueId() ][ candDecl->get_uniqueId() ]++ > recursionParentLimit ) continue;
[22cad76]499 Expression *varExpr = new VariableExpr( candDecl );
[0f19d763]500 deleteAll( varExpr->get_results() );
501 varExpr->get_results().clear();
502 varExpr->get_results().push_front( adjType->clone() );
503 PRINT(
[6ed1d4b]504 std::cerr << "satisfying assertion " << curDecl->get_uniqueId() << " ";
505 curDecl->print( std::cerr );
506 std::cerr << " with declaration " << (*candidate)->get_uniqueId() << " ";
507 (*candidate)->print( std::cerr );
508 std::cerr << std::endl;
[7c64920]509 )
[0f19d763]510 ApplicationExpr *appExpr = static_cast< ApplicationExpr* >( newerAlt.expr );
511 // XXX: this is a memory leak, but adjType can't be deleted because it might contain assertions
512 appExpr->get_inferParams()[ curDecl->get_uniqueId() ] = ParamEntry( (*candidate)->get_uniqueId(), adjType->clone(), curDecl->get_type()->clone(), varExpr );
[89b686a]513 inferRecursive( begin, end, newerAlt, newOpenVars, newDecls, newerNeed, /*newNeedParents,*/ level, indexer, out );
[0f19d763]514 } else {
515 delete adjType;
516 }
[a32b204]517 }
[d9a0e76]518 }
519
[a32b204]520 template< typename OutputIterator >
521 void AlternativeFinder::inferParameters( const AssertionSet &need, AssertionSet &have, const Alternative &newAlt, OpenVarSet &openVars, OutputIterator out ) {
[d9a0e76]522// PRINT(
[6ed1d4b]523// std::cerr << "inferParameters: assertions needed are" << std::endl;
524// printAll( need, std::cerr, 8 );
[d9a0e76]525// )
[a32b204]526 SymTab::Indexer decls( indexer );
527 PRINT(
[6ed1d4b]528 std::cerr << "============= original indexer" << std::endl;
529 indexer.print( std::cerr );
530 std::cerr << "============= new indexer" << std::endl;
531 decls.print( std::cerr );
[7c64920]532 )
[0f19d763]533 addToIndexer( have, decls );
[a32b204]534 AssertionSet newNeed;
[89b686a]535 //AssertionParentSet needParents;
536 inferRecursive( need.begin(), need.end(), newAlt, openVars, decls, newNeed, /*needParents,*/ 0, indexer, out );
[d9a0e76]537// PRINT(
[6ed1d4b]538// std::cerr << "declaration 14 is ";
[d9a0e76]539// Declaration::declFromId
540// *out++ = newAlt;
541// )
542 }
543
[a32b204]544 template< typename OutputIterator >
545 void AlternativeFinder::makeFunctionAlternatives( const Alternative &func, FunctionType *funcType, AltList &actualAlt, OutputIterator out ) {
546 OpenVarSet openVars;
547 AssertionSet resultNeed, resultHave;
548 TypeEnvironment resultEnv;
549 makeUnifiableVars( funcType, openVars, resultNeed );
550 if ( instantiateFunction( funcType->get_parameters(), actualAlt, funcType->get_isVarArgs(), openVars, resultEnv, resultNeed, resultHave ) ) {
551 ApplicationExpr *appExpr = new ApplicationExpr( func.expr->clone() );
552 Alternative newAlt( appExpr, resultEnv, sumCost( actualAlt ) );
553 makeExprList( actualAlt, appExpr->get_args() );
554 PRINT(
[6ed1d4b]555 std::cerr << "need assertions:" << std::endl;
556 printAssertionSet( resultNeed, std::cerr, 8 );
[7c64920]557 )
[0f19d763]558 inferParameters( resultNeed, resultHave, newAlt, openVars, out );
[d9a0e76]559 }
560 }
561
[a32b204]562 void AlternativeFinder::visit( UntypedExpr *untypedExpr ) {
563 bool doneInit = false;
564 AlternativeFinder funcOpFinder( indexer, env );
[d9a0e76]565
[6ed1d4b]566 AlternativeFinder funcFinder( indexer, env );
567
568 {
[70f89d00]569 std::string fname = InitTweak::getFunctionName( untypedExpr );
570 if ( fname == "&&" ) {
[2871210]571 VoidType v = Type::Qualifiers(); // resolve to type void *
572 PointerType pt( Type::Qualifiers(), v.clone() );
573 UntypedExpr *vexpr = untypedExpr->clone();
574 vexpr->get_results().push_front( pt.clone() );
575 alternatives.push_back( Alternative( vexpr, env, Cost()) );
[a32b204]576 return;
577 }
578 }
[d9a0e76]579
[a32b204]580 funcFinder.findWithAdjustment( untypedExpr->get_function() );
581 std::list< AlternativeFinder > argAlternatives;
582 findSubExprs( untypedExpr->begin_args(), untypedExpr->end_args(), back_inserter( argAlternatives ) );
[d9a0e76]583
[a32b204]584 std::list< AltList > possibilities;
585 combos( argAlternatives.begin(), argAlternatives.end(), back_inserter( possibilities ) );
[d9a0e76]586
[a32b204]587 Tuples::TupleAssignSpotter tassign( this );
588 if ( tassign.isTupleAssignment( untypedExpr, possibilities ) ) {
589 // take care of possible tuple assignments, or discard expression
590 return;
591 } // else ...
[d9a0e76]592
[a32b204]593 AltList candidates;
[91b8a17]594 SemanticError errors;
[d9a0e76]595
[a32b204]596 for ( AltList::const_iterator func = funcFinder.alternatives.begin(); func != funcFinder.alternatives.end(); ++func ) {
[91b8a17]597 try {
598 PRINT(
599 std::cerr << "working on alternative: " << std::endl;
600 func->print( std::cerr, 8 );
601 )
602 // check if the type is pointer to function
603 PointerType *pointer;
604 if ( func->expr->get_results().size() == 1 && ( pointer = dynamic_cast< PointerType* >( func->expr->get_results().front() ) ) ) {
605 if ( FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ) ) {
606 for ( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) {
607 // XXX
608 //Designators::check_alternative( function, *actualAlt );
609 makeFunctionAlternatives( *func, function, *actualAlt, std::back_inserter( candidates ) );
610 }
611 } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( pointer->get_base() ) ) {
612 EqvClass eqvClass;
613 if ( func->env.lookup( typeInst->get_name(), eqvClass ) && eqvClass.type ) {
614 if ( FunctionType *function = dynamic_cast< FunctionType* >( eqvClass.type ) ) {
615 for ( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) {
616 makeFunctionAlternatives( *func, function, *actualAlt, std::back_inserter( candidates ) );
617 } // for
618 } // if
[a32b204]619 } // if
620 } // if
[91b8a17]621 } else {
622 // seek a function operator that's compatible
623 if ( ! doneInit ) {
624 doneInit = true;
625 NameExpr *opExpr = new NameExpr( "?()" );
626 try {
627 funcOpFinder.findWithAdjustment( opExpr );
628 } catch( SemanticError &e ) {
629 // it's ok if there aren't any defined function ops
630 }
631 PRINT(
632 std::cerr << "known function ops:" << std::endl;
633 printAlts( funcOpFinder.alternatives, std::cerr, 8 );
634 )
[a32b204]635 }
636
[91b8a17]637 for ( AltList::const_iterator funcOp = funcOpFinder.alternatives.begin(); funcOp != funcOpFinder.alternatives.end(); ++funcOp ) {
638 // check if the type is pointer to function
639 PointerType *pointer;
640 if ( funcOp->expr->get_results().size() == 1
641 && ( pointer = dynamic_cast< PointerType* >( funcOp->expr->get_results().front() ) ) ) {
642 if ( FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() ) ) {
643 for ( std::list< AltList >::iterator actualAlt = possibilities.begin(); actualAlt != possibilities.end(); ++actualAlt ) {
644 AltList currentAlt;
645 currentAlt.push_back( *func );
646 currentAlt.insert( currentAlt.end(), actualAlt->begin(), actualAlt->end() );
647 makeFunctionAlternatives( *funcOp, function, currentAlt, std::back_inserter( candidates ) );
648 } // for
649 } // if
[a32b204]650 } // if
[91b8a17]651 } // for
652 } // if
653 } catch ( SemanticError &e ) {
654 errors.append( e );
655 }
[a32b204]656 } // for
657
[91b8a17]658 // Implement SFINAE; resolution errors are only errors if there aren't any non-erroneous resolutions
659 if ( candidates.empty() && ! errors.isEmpty() ) { throw errors; }
660
[a32b204]661 for ( AltList::iterator withFunc = candidates.begin(); withFunc != candidates.end(); ++withFunc ) {
662 Cost cvtCost = computeConversionCost( *withFunc, indexer );
663
664 PRINT(
665 ApplicationExpr *appExpr = dynamic_cast< ApplicationExpr* >( withFunc->expr );
666 assert( appExpr );
667 PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() );
668 assert( pointer );
669 FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() );
670 assert( function );
[6ed1d4b]671 std::cerr << "Case +++++++++++++" << std::endl;
672 std::cerr << "formals are:" << std::endl;
673 printAll( function->get_parameters(), std::cerr, 8 );
674 std::cerr << "actuals are:" << std::endl;
675 printAll( appExpr->get_args(), std::cerr, 8 );
676 std::cerr << "bindings are:" << std::endl;
677 withFunc->env.print( std::cerr, 8 );
678 std::cerr << "cost of conversion is:" << cvtCost << std::endl;
[7c64920]679 )
680 if ( cvtCost != Cost::infinity ) {
681 withFunc->cvtCost = cvtCost;
682 alternatives.push_back( *withFunc );
683 } // if
[a32b204]684 } // for
685 candidates.clear();
686 candidates.splice( candidates.end(), alternatives );
687
688 findMinCost( candidates.begin(), candidates.end(), std::back_inserter( alternatives ) );
689 }
690
691 bool isLvalue( Expression *expr ) {
692 for ( std::list< Type* >::const_iterator i = expr->get_results().begin(); i != expr->get_results().end(); ++i ) {
693 if ( !(*i)->get_isLvalue() ) return false;
694 } // for
695 return true;
696 }
697
698 void AlternativeFinder::visit( AddressExpr *addressExpr ) {
699 AlternativeFinder finder( indexer, env );
700 finder.find( addressExpr->get_arg() );
701 for ( std::list< Alternative >::iterator i = finder.alternatives.begin(); i != finder.alternatives.end(); ++i ) {
702 if ( isLvalue( i->expr ) ) {
703 alternatives.push_back( Alternative( new AddressExpr( i->expr->clone() ), i->env, i->cost ) );
704 } // if
705 } // for
706 }
707
708 void AlternativeFinder::visit( CastExpr *castExpr ) {
709 for ( std::list< Type* >::iterator i = castExpr->get_results().begin(); i != castExpr->get_results().end(); ++i ) {
[85517ddb]710 *i = resolveTypeof( *i, indexer );
[a32b204]711 SymTab::validateType( *i, &indexer );
712 adjustExprType( *i, env, indexer );
713 } // for
714
715 AlternativeFinder finder( indexer, env );
716 finder.findWithAdjustment( castExpr->get_arg() );
717
718 AltList candidates;
719 for ( std::list< Alternative >::iterator i = finder.alternatives.begin(); i != finder.alternatives.end(); ++i ) {
720 AssertionSet needAssertions, haveAssertions;
721 OpenVarSet openVars;
722
723 // It's possible that a cast can throw away some values in a multiply-valued expression. (An example is a
724 // cast-to-void, which casts from one value to zero.) Figure out the prefix of the subexpression results
725 // that are cast directly. The candidate is invalid if it has fewer results than there are types to cast
726 // to.
727 int discardedValues = (*i).expr->get_results().size() - castExpr->get_results().size();
728 if ( discardedValues < 0 ) continue;
729 std::list< Type* >::iterator candidate_end = (*i).expr->get_results().begin();
730 std::advance( candidate_end, castExpr->get_results().size() );
[adcdd2f]731 // unification run for side-effects
732 unifyList( castExpr->get_results().begin(), castExpr->get_results().end(),
733 (*i).expr->get_results().begin(), candidate_end,
734 i->env, needAssertions, haveAssertions, openVars, indexer );
[a32b204]735 Cost thisCost = castCostList( (*i).expr->get_results().begin(), candidate_end,
[adcdd2f]736 castExpr->get_results().begin(), castExpr->get_results().end(),
737 indexer, i->env );
[a32b204]738 if ( thisCost != Cost::infinity ) {
739 // count one safe conversion for each value that is thrown away
740 thisCost += Cost( 0, 0, discardedValues );
741 CastExpr *newExpr = castExpr->clone();
742 newExpr->set_arg( i->expr->clone() );
743 candidates.push_back( Alternative( newExpr, i->env, i->cost, thisCost ) );
744 } // if
745 } // for
746
747 // findMinCost selects the alternatives with the lowest "cost" members, but has the side effect of copying the
748 // cvtCost member to the cost member (since the old cost is now irrelevant). Thus, calling findMinCost twice
749 // selects first based on argument cost, then on conversion cost.
750 AltList minArgCost;
751 findMinCost( candidates.begin(), candidates.end(), std::back_inserter( minArgCost ) );
752 findMinCost( minArgCost.begin(), minArgCost.end(), std::back_inserter( alternatives ) );
753 }
754
755 void AlternativeFinder::visit( UntypedMemberExpr *memberExpr ) {
756 AlternativeFinder funcFinder( indexer, env );
757 funcFinder.findWithAdjustment( memberExpr->get_aggregate() );
758
759 for ( AltList::const_iterator agg = funcFinder.alternatives.begin(); agg != funcFinder.alternatives.end(); ++agg ) {
760 if ( agg->expr->get_results().size() == 1 ) {
761 if ( StructInstType *structInst = dynamic_cast< StructInstType* >( agg->expr->get_results().front() ) ) {
762 addAggMembers( structInst, agg->expr, agg->cost, memberExpr->get_member() );
763 } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( agg->expr->get_results().front() ) ) {
764 addAggMembers( unionInst, agg->expr, agg->cost, memberExpr->get_member() );
765 } // if
766 } // if
767 } // for
768 }
769
770 void AlternativeFinder::visit( MemberExpr *memberExpr ) {
771 alternatives.push_back( Alternative( memberExpr->clone(), env, Cost::zero ) );
772 }
773
774 void AlternativeFinder::visit( NameExpr *nameExpr ) {
775 std::list< DeclarationWithType* > declList;
776 indexer.lookupId( nameExpr->get_name(), declList );
777 PRINT( std::cerr << "nameExpr is " << nameExpr->get_name() << std::endl; )
[0f19d763]778 for ( std::list< DeclarationWithType* >::iterator i = declList.begin(); i != declList.end(); ++i ) {
779 VariableExpr newExpr( *i, nameExpr->get_argName() );
780 alternatives.push_back( Alternative( newExpr.clone(), env, Cost() ) );
781 PRINT(
782 std::cerr << "decl is ";
783 (*i)->print( std::cerr );
784 std::cerr << std::endl;
785 std::cerr << "newExpr is ";
786 newExpr.print( std::cerr );
787 std::cerr << std::endl;
[7c64920]788 )
[0f19d763]789 renameTypes( alternatives.back().expr );
790 if ( StructInstType *structInst = dynamic_cast< StructInstType* >( (*i)->get_type() ) ) {
791 addAggMembers( structInst, &newExpr, Cost( 0, 0, 1 ), "" );
792 } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( (*i)->get_type() ) ) {
793 addAggMembers( unionInst, &newExpr, Cost( 0, 0, 1 ), "" );
794 } // if
795 } // for
[a32b204]796 }
797
798 void AlternativeFinder::visit( VariableExpr *variableExpr ) {
[85517ddb]799 // not sufficient to clone here, because variable's type may have changed
800 // since the VariableExpr was originally created.
801 alternatives.push_back( Alternative( new VariableExpr( variableExpr->get_var() ), env, Cost::zero ) );
[a32b204]802 }
803
804 void AlternativeFinder::visit( ConstantExpr *constantExpr ) {
805 alternatives.push_back( Alternative( constantExpr->clone(), env, Cost::zero ) );
806 }
807
808 void AlternativeFinder::visit( SizeofExpr *sizeofExpr ) {
809 if ( sizeofExpr->get_isType() ) {
[85517ddb]810 // xxx - resolveTypeof?
[a32b204]811 alternatives.push_back( Alternative( sizeofExpr->clone(), env, Cost::zero ) );
812 } else {
813 // find all alternatives for the argument to sizeof
814 AlternativeFinder finder( indexer, env );
815 finder.find( sizeofExpr->get_expr() );
816 // find the lowest cost alternative among the alternatives, otherwise ambiguous
817 AltList winners;
818 findMinCost( finder.alternatives.begin(), finder.alternatives.end(), back_inserter( winners ) );
819 if ( winners.size() != 1 ) {
820 throw SemanticError( "Ambiguous expression in sizeof operand: ", sizeofExpr->get_expr() );
821 } // if
822 // return the lowest cost alternative for the argument
823 Alternative &choice = winners.front();
824 alternatives.push_back( Alternative( new SizeofExpr( choice.expr->clone() ), choice.env, Cost::zero ) );
[47534159]825 } // if
826 }
827
828 void AlternativeFinder::visit( AlignofExpr *alignofExpr ) {
829 if ( alignofExpr->get_isType() ) {
[85517ddb]830 // xxx - resolveTypeof?
[47534159]831 alternatives.push_back( Alternative( alignofExpr->clone(), env, Cost::zero ) );
832 } else {
833 // find all alternatives for the argument to sizeof
834 AlternativeFinder finder( indexer, env );
835 finder.find( alignofExpr->get_expr() );
836 // find the lowest cost alternative among the alternatives, otherwise ambiguous
837 AltList winners;
838 findMinCost( finder.alternatives.begin(), finder.alternatives.end(), back_inserter( winners ) );
839 if ( winners.size() != 1 ) {
840 throw SemanticError( "Ambiguous expression in alignof operand: ", alignofExpr->get_expr() );
841 } // if
842 // return the lowest cost alternative for the argument
843 Alternative &choice = winners.front();
844 alternatives.push_back( Alternative( new AlignofExpr( choice.expr->clone() ), choice.env, Cost::zero ) );
[a32b204]845 } // if
846 }
847
[2a4b088]848 template< typename StructOrUnionType >
849 void AlternativeFinder::addOffsetof( StructOrUnionType *aggInst, const std::string &name ) {
850 std::list< Declaration* > members;
851 aggInst->lookup( name, members );
852 for ( std::list< Declaration* >::const_iterator i = members.begin(); i != members.end(); ++i ) {
853 if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i ) ) {
[79970ed]854 alternatives.push_back( Alternative( new OffsetofExpr( aggInst->clone(), dwt ), env, Cost::zero ) );
[2a4b088]855 renameTypes( alternatives.back().expr );
856 } else {
857 assert( false );
858 }
859 }
860 }
[6ed1d4b]861
[2a4b088]862 void AlternativeFinder::visit( UntypedOffsetofExpr *offsetofExpr ) {
863 AlternativeFinder funcFinder( indexer, env );
[85517ddb]864 // xxx - resolveTypeof?
[2a4b088]865 if ( StructInstType *structInst = dynamic_cast< StructInstType* >( offsetofExpr->get_type() ) ) {
866 addOffsetof( structInst, offsetofExpr->get_member() );
867 } else if ( UnionInstType *unionInst = dynamic_cast< UnionInstType* >( offsetofExpr->get_type() ) ) {
868 addOffsetof( unionInst, offsetofExpr->get_member() );
869 }
870 }
[6ed1d4b]871
[25a054f]872 void AlternativeFinder::visit( OffsetofExpr *offsetofExpr ) {
873 alternatives.push_back( Alternative( offsetofExpr->clone(), env, Cost::zero ) );
[afc1045]874 }
875
876 void AlternativeFinder::visit( OffsetPackExpr *offsetPackExpr ) {
877 alternatives.push_back( Alternative( offsetPackExpr->clone(), env, Cost::zero ) );
[25a054f]878 }
879
[a32b204]880 void AlternativeFinder::resolveAttr( DeclarationWithType *funcDecl, FunctionType *function, Type *argType, const TypeEnvironment &env ) {
881 // assume no polymorphism
882 // assume no implicit conversions
883 assert( function->get_parameters().size() == 1 );
884 PRINT(
[6ed1d4b]885 std::cerr << "resolvAttr: funcDecl is ";
886 funcDecl->print( std::cerr );
887 std::cerr << " argType is ";
888 argType->print( std::cerr );
889 std::cerr << std::endl;
[7c64920]890 )
891 if ( typesCompatibleIgnoreQualifiers( argType, function->get_parameters().front()->get_type(), indexer, env ) ) {
892 alternatives.push_back( Alternative( new AttrExpr( new VariableExpr( funcDecl ), argType->clone() ), env, Cost::zero ) );
893 for ( std::list< DeclarationWithType* >::iterator i = function->get_returnVals().begin(); i != function->get_returnVals().end(); ++i ) {
894 alternatives.back().expr->get_results().push_back( (*i)->get_type()->clone() );
895 } // for
896 } // if
[a32b204]897 }
898
899 void AlternativeFinder::visit( AttrExpr *attrExpr ) {
900 // assume no 'pointer-to-attribute'
901 NameExpr *nameExpr = dynamic_cast< NameExpr* >( attrExpr->get_attr() );
902 assert( nameExpr );
903 std::list< DeclarationWithType* > attrList;
904 indexer.lookupId( nameExpr->get_name(), attrList );
905 if ( attrExpr->get_isType() || attrExpr->get_expr() ) {
906 for ( std::list< DeclarationWithType* >::iterator i = attrList.begin(); i != attrList.end(); ++i ) {
907 // check if the type is function
908 if ( FunctionType *function = dynamic_cast< FunctionType* >( (*i)->get_type() ) ) {
909 // assume exactly one parameter
910 if ( function->get_parameters().size() == 1 ) {
911 if ( attrExpr->get_isType() ) {
912 resolveAttr( *i, function, attrExpr->get_type(), env );
913 } else {
914 AlternativeFinder finder( indexer, env );
915 finder.find( attrExpr->get_expr() );
916 for ( AltList::iterator choice = finder.alternatives.begin(); choice != finder.alternatives.end(); ++choice ) {
917 if ( choice->expr->get_results().size() == 1 ) {
918 resolveAttr(*i, function, choice->expr->get_results().front(), choice->env );
919 } // fi
920 } // for
921 } // if
922 } // if
923 } // if
924 } // for
925 } else {
926 for ( std::list< DeclarationWithType* >::iterator i = attrList.begin(); i != attrList.end(); ++i ) {
927 VariableExpr newExpr( *i );
928 alternatives.push_back( Alternative( newExpr.clone(), env, Cost() ) );
929 renameTypes( alternatives.back().expr );
930 } // for
931 } // if
932 }
933
934 void AlternativeFinder::visit( LogicalExpr *logicalExpr ) {
935 AlternativeFinder firstFinder( indexer, env );
936 firstFinder.findWithAdjustment( logicalExpr->get_arg1() );
937 for ( AltList::const_iterator first = firstFinder.alternatives.begin(); first != firstFinder.alternatives.end(); ++first ) {
938 AlternativeFinder secondFinder( indexer, first->env );
939 secondFinder.findWithAdjustment( logicalExpr->get_arg2() );
940 for ( AltList::const_iterator second = secondFinder.alternatives.begin(); second != secondFinder.alternatives.end(); ++second ) {
941 LogicalExpr *newExpr = new LogicalExpr( first->expr->clone(), second->expr->clone(), logicalExpr->get_isAnd() );
942 alternatives.push_back( Alternative( newExpr, second->env, first->cost + second->cost ) );
[d9a0e76]943 }
944 }
945 }
[51b73452]946
[a32b204]947 void AlternativeFinder::visit( ConditionalExpr *conditionalExpr ) {
948 AlternativeFinder firstFinder( indexer, env );
949 firstFinder.findWithAdjustment( conditionalExpr->get_arg1() );
950 for ( AltList::const_iterator first = firstFinder.alternatives.begin(); first != firstFinder.alternatives.end(); ++first ) {
951 AlternativeFinder secondFinder( indexer, first->env );
952 secondFinder.findWithAdjustment( conditionalExpr->get_arg2() );
953 for ( AltList::const_iterator second = secondFinder.alternatives.begin(); second != secondFinder.alternatives.end(); ++second ) {
954 AlternativeFinder thirdFinder( indexer, second->env );
955 thirdFinder.findWithAdjustment( conditionalExpr->get_arg3() );
956 for ( AltList::const_iterator third = thirdFinder.alternatives.begin(); third != thirdFinder.alternatives.end(); ++third ) {
957 OpenVarSet openVars;
958 AssertionSet needAssertions, haveAssertions;
959 Alternative newAlt( 0, third->env, first->cost + second->cost + third->cost );
960 std::list< Type* > commonTypes;
961 if ( unifyList( second->expr->get_results().begin(), second->expr->get_results().end(), third->expr->get_results().begin(), third->expr->get_results().end(), newAlt.env, needAssertions, haveAssertions, openVars, indexer, commonTypes ) ) {
962 ConditionalExpr *newExpr = new ConditionalExpr( first->expr->clone(), second->expr->clone(), third->expr->clone() );
963 std::list< Type* >::const_iterator original = second->expr->get_results().begin();
964 std::list< Type* >::const_iterator commonType = commonTypes.begin();
965 for ( ; original != second->expr->get_results().end() && commonType != commonTypes.end(); ++original, ++commonType ) {
966 if ( *commonType ) {
967 newExpr->get_results().push_back( *commonType );
968 } else {
969 newExpr->get_results().push_back( (*original)->clone() );
970 } // if
971 } // for
972 newAlt.expr = newExpr;
973 inferParameters( needAssertions, haveAssertions, newAlt, openVars, back_inserter( alternatives ) );
974 } // if
975 } // for
976 } // for
977 } // for
978 }
979
980 void AlternativeFinder::visit( CommaExpr *commaExpr ) {
981 TypeEnvironment newEnv( env );
982 Expression *newFirstArg = resolveInVoidContext( commaExpr->get_arg1(), indexer, newEnv );
983 AlternativeFinder secondFinder( indexer, newEnv );
984 secondFinder.findWithAdjustment( commaExpr->get_arg2() );
985 for ( AltList::const_iterator alt = secondFinder.alternatives.begin(); alt != secondFinder.alternatives.end(); ++alt ) {
986 alternatives.push_back( Alternative( new CommaExpr( newFirstArg->clone(), alt->expr->clone() ), alt->env, alt->cost ) );
987 } // for
988 delete newFirstArg;
989 }
990
991 void AlternativeFinder::visit( TupleExpr *tupleExpr ) {
992 std::list< AlternativeFinder > subExprAlternatives;
993 findSubExprs( tupleExpr->get_exprs().begin(), tupleExpr->get_exprs().end(), back_inserter( subExprAlternatives ) );
994 std::list< AltList > possibilities;
995 combos( subExprAlternatives.begin(), subExprAlternatives.end(), back_inserter( possibilities ) );
996 for ( std::list< AltList >::const_iterator i = possibilities.begin(); i != possibilities.end(); ++i ) {
997 TupleExpr *newExpr = new TupleExpr;
998 makeExprList( *i, newExpr->get_exprs() );
999 for ( std::list< Expression* >::const_iterator resultExpr = newExpr->get_exprs().begin(); resultExpr != newExpr->get_exprs().end(); ++resultExpr ) {
1000 for ( std::list< Type* >::const_iterator resultType = (*resultExpr)->get_results().begin(); resultType != (*resultExpr)->get_results().end(); ++resultType ) {
1001 newExpr->get_results().push_back( (*resultType)->clone() );
1002 } // for
1003 } // for
1004
1005 TypeEnvironment compositeEnv;
1006 simpleCombineEnvironments( i->begin(), i->end(), compositeEnv );
1007 alternatives.push_back( Alternative( newExpr, compositeEnv, sumCost( *i ) ) );
1008 } // for
[d9a0e76]1009 }
[dc2e7e0]1010
1011 void AlternativeFinder::visit( ImplicitCopyCtorExpr * impCpCtorExpr ) {
1012 alternatives.push_back( Alternative( impCpCtorExpr->clone(), env, Cost::zero ) );
1013 }
[51b73452]1014} // namespace ResolvExpr
[a32b204]1015
1016// Local Variables: //
1017// tab-width: 4 //
1018// mode: c++ //
1019// compile-command: "make install" //
1020// End: //
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