source: src/Tuples/TupleAssignment.cc@ e64365c

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors ctor deferred_resn demangler enum forall-pointer-decay gc_noraii jacob/cs343-translation jenkins-sandbox memory 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 e64365c was d3b7937, checked in by Peter A. Buhr <pabuhr@…>, 10 years ago

building runtime library (first attempt)
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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// TupleAssignment.cc --
8//
9// Author : Rodolfo G. Esteves
10// Created On : Mon May 18 07:44:20 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Mon May 18 15:02:53 2015
13// Update Count : 2
14//
15
16#include "ResolvExpr/AlternativeFinder.h"
17#include "ResolvExpr/Alternative.h"
18#include "ResolvExpr/typeops.h"
19#include "SynTree/Expression.h"
20#include "TupleAssignment.h"
21#include "Common/SemanticError.h"
22
23#include <functional>
24#include <algorithm>
25#include <iterator>
26#include <iostream>
27#include <cassert>
28#include <set>
29
30namespace Tuples {
31 TupleAssignSpotter::TupleAssignSpotter( ResolvExpr::AlternativeFinder *f = 0 )
32 : currentFinder(f), matcher(0), hasMatched( false ) {}
33
34 bool TupleAssignSpotter::pointsToTuple( Expression *expr ) {
35 // also check for function returning tuple of reference types
36 if (AddressExpr *addr = dynamic_cast<AddressExpr *>(expr) )
37 if ( isTuple(addr->get_arg() ) )
38 return true;
39 return false;
40 }
41
42 bool TupleAssignSpotter::isTupleVar( DeclarationWithType *decl ) {
43 if ( dynamic_cast<TupleType *>(decl->get_type()) )
44 return true;
45 return false;
46 }
47
48 bool TupleAssignSpotter::isTuple( Expression *expr, bool isRight ) {
49 // true if `expr' is an expression returning a tuple: tuple, tuple variable or MRV function
50 if ( ! expr ) return false;
51
52 if ( dynamic_cast<TupleExpr *>(expr) )
53 return true;
54 else if ( VariableExpr *var = dynamic_cast<VariableExpr *>(expr) ) {
55 if ( isTupleVar(var->get_var()) )
56 return true;
57 }
58
59 return false;
60 }
61
62 bool TupleAssignSpotter::match() {
63 assert ( matcher != 0 );
64
65 std::list< Expression * > new_assigns;
66 if ( ! matcher->match(new_assigns) )
67 return false;
68
69 if ( new_assigns.empty() ) return false;
70 /*return */matcher->solve( new_assigns );
71 if ( dynamic_cast<TupleAssignSpotter::MultipleAssignMatcher *>( matcher ) ) {
72 // now resolve new assignments
73 std::list< Expression * > solved_assigns;
74 ResolvExpr::AltList solved_alts;
75 assert( currentFinder != 0 );
76
77 ResolvExpr::AltList current;
78 for ( std::list< Expression * >::iterator i = new_assigns.begin(); i != new_assigns.end(); ++i ) {
79 //try {
80 ResolvExpr::AlternativeFinder finder( currentFinder->get_indexer(), currentFinder->get_environ() );
81 finder.findWithAdjustment(*i);
82 // prune expressions that don't coincide with
83 ResolvExpr::AltList alts = finder.get_alternatives();
84 assert( alts.size() == 1 );
85 assert(alts.front().expr != 0 );
86 current.push_back( finder.get_alternatives().front() );
87 solved_assigns.push_back( alts.front().expr->clone() );
88 //solved_assigns.back()->print(std::cerr);
89 /*} catch( ... ) {
90 continue; // no reasonable alternative found
91 }*/
92 }
93 options.add_option( current );
94
95 return true;
96 } else { // mass assignment
97 //if ( new_assigns.empty() ) return false;
98 std::list< Expression * > solved_assigns;
99 ResolvExpr::AltList solved_alts;
100 assert( currentFinder != 0 );
101
102 ResolvExpr::AltList current;
103 if ( optMass.empty() ) {
104 for ( std::list< Expression * >::size_type i = 0; i != new_assigns.size(); ++i )
105 optMass.push_back( ResolvExpr::AltList() );
106 }
107 int cnt = 0;
108 for ( std::list< Expression * >::iterator i = new_assigns.begin(); i != new_assigns.end(); ++i, cnt++ ) {
109
110 ResolvExpr::AlternativeFinder finder( currentFinder->get_indexer(), currentFinder->get_environ() );
111 finder.findWithAdjustment(*i);
112 ResolvExpr::AltList alts = finder.get_alternatives();
113 assert( alts.size() == 1 );
114 assert(alts.front().expr != 0 );
115 current.push_back( finder.get_alternatives().front() );
116 optMass[cnt].push_back( finder.get_alternatives().front() );
117 solved_assigns.push_back( alts.front().expr->clone() );
118 }
119
120 return true;
121 }
122
123 return false;
124 }
125
126 bool TupleAssignSpotter::isMVR( Expression *expr ) {
127 if ( expr->get_results().size() > 1 ) {
128 // MVR processing
129 return true;
130 }
131 return false;
132 }
133
134 bool TupleAssignSpotter::isTupleAssignment( UntypedExpr * expr, std::list<ResolvExpr::AltList> &possibilities ) {
135 if ( NameExpr *assgnop = dynamic_cast< NameExpr * >(expr->get_function()) ) {
136
137 if ( assgnop->get_name() == std::string("?=?") ) {
138
139 for ( std::list<ResolvExpr::AltList>::iterator ali = possibilities.begin(); ali != possibilities.end(); ++ali ) {
140 assert( ali->size() == 2 );
141 ResolvExpr::AltList::iterator opit = ali->begin();
142 ResolvExpr::Alternative op1 = *opit, op2 = *(++opit);
143
144 if ( pointsToTuple(op1.expr) ) { // also handles tuple vars
145 if ( isTuple( op2.expr, true ) )
146 matcher = new MultipleAssignMatcher(op1.expr, op2.expr);
147 else if ( isMVR( op2.expr ) ) {
148 // handle MVR differently
149 } else
150 // mass assignment
151 matcher = new MassAssignMatcher(op1.expr, op2.expr);
152
153 std::list< ResolvExpr::AltList > options;
154 if ( match() )
155 /*
156 if ( hasMatched ) {
157 // throw SemanticError("Ambiguous tuple assignment");
158 } else {*/
159 // Matched for the first time
160 hasMatched = true;
161 /*} */
162 } /* else if ( isTuple( op2 ) )
163 throw SemanticError("Inapplicable tuple assignment.");
164 */
165 }
166
167 if ( hasMatched ) {
168 if ( dynamic_cast<TupleAssignSpotter::MultipleAssignMatcher *>( matcher ) ) {
169 //options.print( std::cerr );
170 std::list< ResolvExpr::AltList >best = options.get_best();
171 if ( best.size() == 1 ) {
172 std::list<Expression *> solved_assigns;
173 for ( ResolvExpr::AltList::iterator i = best.front().begin(); i != best.front().end(); ++i ) {
174 solved_assigns.push_back( i->expr );
175 }
176 /* assigning cost zero? */
177 currentFinder->get_alternatives().push_front( ResolvExpr::Alternative(new SolvedTupleExpr(solved_assigns/*, SolvedTupleExpr::MULTIPLE*/), currentFinder->get_environ(), ResolvExpr::Cost() ) );
178 }
179 } else {
180 assert( ! optMass.empty() );
181 ResolvExpr::AltList winners;
182 for ( std::vector< ResolvExpr::AltList >::iterator i = optMass.begin(); i != optMass.end(); ++i )
183 findMinCostAlt( i->begin(), i->end(), back_inserter(winners) );
184
185 std::list< Expression *> solved_assigns;
186 for ( ResolvExpr::AltList::iterator i = winners.begin(); i != winners.end(); ++i )
187 solved_assigns.push_back( i->expr );
188 currentFinder->get_alternatives().push_front( ResolvExpr::Alternative(new SolvedTupleExpr(solved_assigns/*, SolvedTupleExpr::MASS*/), currentFinder->get_environ(), ResolvExpr::Cost() ) );
189 }
190 }
191 }
192 }
193 return hasMatched;
194 }
195
196 void TupleAssignSpotter::Matcher::init( Expression *_lhs, Expression *_rhs ) {
197 lhs.clear();
198 if (AddressExpr *addr = dynamic_cast<AddressExpr *>(_lhs) )
199 if ( TupleExpr *tuple = dynamic_cast<TupleExpr *>(addr->get_arg()) )
200 std::copy( tuple->get_exprs().begin(), tuple->get_exprs().end(), back_inserter(lhs) );
201
202 rhs.clear();
203 }
204
205 TupleAssignSpotter::Matcher::Matcher( /*TupleAssignSpotter &spot,*/ Expression *_lhs, Expression *_rhs ) /*: own_spotter(spot) */{
206 init(_lhs,_rhs);
207 }
208
209 TupleAssignSpotter::MultipleAssignMatcher::MultipleAssignMatcher( Expression *_lhs, Expression *_rhs )/* : own_spotter(spot) */{
210 init(_lhs,_rhs);
211
212 if ( TupleExpr *tuple = dynamic_cast<TupleExpr *>(_rhs) )
213 std::copy( tuple->get_exprs().begin(), tuple->get_exprs().end(), back_inserter(rhs) );
214 }
215
216 UntypedExpr *TupleAssignSpotter::Matcher::createAssgn( Expression *left, Expression *right ) {
217 if ( left && right ) {
218 std::list< Expression * > args;
219 args.push_back(new AddressExpr(left->clone())); args.push_back(right->clone());
220 return new UntypedExpr(new NameExpr("?=?"), args);
221 } else
222 throw 0; // xxx - diagnose the problem
223 }
224
225 bool TupleAssignSpotter::MassAssignMatcher::match( std::list< Expression * > &out ) {
226 if ( lhs.empty() || (rhs.size() != 1) ) return false;
227
228 for ( std::list< Expression * >::iterator l = lhs.begin(); l != lhs.end(); l++ ) {
229 std::list< Expression * > args;
230 args.push_back( new AddressExpr(*l) );
231 args.push_back( rhs.front() );
232 out.push_back( new UntypedExpr(new NameExpr("?=?"), args) );
233 }
234
235 return true;
236 }
237
238 bool TupleAssignSpotter::MassAssignMatcher::solve( std::list< Expression * > &assigns ) {
239 /*
240 std::list< Expression * > solved_assigns;
241 ResolvExpr::AltList solved_alts;
242 assert( currentFinder != 0 );
243
244 ResolvExpr::AltList current;
245 if ( optMass.empty() ) {
246 for ( std::list< Expression * >::size_type i = 0; i != new_assigns.size(); ++i )
247 optMass.push_back( ResolvExpr::AltList() );
248 }
249 int cnt = 0;
250 for ( std::list< Expression * >::iterator i = new_assigns.begin(); i != new_assigns.end(); ++i, cnt++ ) {
251
252 ResolvExpr::AlternativeFinder finder( currentFinder->get_indexer(), currentFinder->get_environ() );
253 finder.findWithAdjustment(*i);
254 ResolvExpr::AltList alts = finder.get_alternatives();
255 assert( alts.size() == 1 );
256 assert(alts.front().expr != 0 );
257 current.push_back( finder.get_alternatives().front() );
258 optMass[cnt].push_back( finder.get_alternatives().front() );
259 solved_assigns.push_back( alts.front().expr->clone() );
260 }
261 */
262 return true;
263 }
264
265 bool TupleAssignSpotter::MultipleAssignMatcher::match( std::list< Expression * > &out ) {
266 // need more complicated matching
267 if ( lhs.size() == rhs.size() ) {
268 zipWith( lhs.begin(), lhs.end(), rhs.begin(), rhs.end(), back_inserter(out), TupleAssignSpotter::Matcher::createAssgn );
269 return true;
270 } //else
271 //std::cerr << "The length of (left, right) is: (" << lhs.size() << "," << rhs.size() << ")" << std::endl;*/
272 return false;
273 }
274
275 bool TupleAssignSpotter::MultipleAssignMatcher::solve( std::list< Expression * > &assigns ) {
276 /*
277 std::list< Expression * > solved_assigns;
278 ResolvExpr::AltList solved_alts;
279 assert( currentFinder != 0 );
280
281 ResolvExpr::AltList current;
282 for ( std::list< Expression * >::iterator i = new_assigns.begin(); i != new_assigns.end(); ++i ) {
283 //try {
284 ResolvExpr::AlternativeFinder finder( currentFinder->get_indexer(), currentFinder->get_environ() );
285 finder.findWithAdjustment(*i);
286 // prune expressions that don't coincide with
287 ResolvExpr::AltList alts = finder.get_alternatives();
288 assert( alts.size() == 1 );
289 assert(alts.front().expr != 0 );
290 current.push_back( finder.get_alternatives().front() );
291 solved_assigns.push_back( alts.front().expr->clone() );
292 //solved_assigns.back()->print(std::cerr);
293 //} catch( ... ) {
294 //continue; // no reasonable alternative found
295 //}
296 }
297 options.add_option( current );
298 */
299
300 return true;
301 }
302
303 void TupleAssignSpotter::Options::add_option( ResolvExpr::AltList &opt ) {
304 using namespace std;
305
306 options.push_back( opt );
307 /*
308 vector< Cost > costs;
309 costs.reserve( opt.size() );
310 transform( opt.begin(), opt.end(), back_inserter(costs), ptr_fun(extract_cost) );
311 */
312 // transpose matrix
313 if ( costMatrix.empty() )
314 for ( unsigned int i = 0; i< opt.size(); ++i)
315 costMatrix.push_back( vector<ResolvExpr::Cost>() );
316
317 int cnt = 0;
318 for ( ResolvExpr::AltList::iterator i = opt.begin(); i != opt.end(); ++i, cnt++ )
319 costMatrix[cnt].push_back( i->cost );
320
321 return;
322 }
323
324 std::list< ResolvExpr::AltList > TupleAssignSpotter::Options::get_best() {
325 using namespace std;
326 using namespace ResolvExpr;
327 list< ResolvExpr::AltList > ret;
328 list< multiset<int> > solns;
329 for ( vector< vector<Cost> >::iterator i = costMatrix.begin(); i != costMatrix.end(); ++i ) {
330 list<int> current;
331 findMinCost( i->begin(), i->end(), back_inserter(current) );
332 solns.push_back( multiset<int>(current.begin(), current.end()) );
333 }
334 // need to combine
335 multiset<int> result;
336 lift_intersection( solns.begin(), solns.end(), inserter( result, result.begin() ) );
337 if ( result.size() != 1 )
338 throw SemanticError("Ambiguous tuple expression");
339 ret.push_back(get_option( *(result.begin() )));
340 return ret;
341 }
342
343 void TupleAssignSpotter::Options::print( std::ostream &ostr ) {
344 using namespace std;
345
346 for ( vector< vector < ResolvExpr::Cost > >::iterator i = costMatrix.begin(); i != costMatrix.end(); ++i ) {
347 for ( vector < ResolvExpr::Cost >::iterator j = i->begin(); j != i->end(); ++j )
348 ostr << *j << " " ;
349 ostr << std::endl;
350 } // for
351 return;
352 }
353
354 ResolvExpr::Cost extract_cost( ResolvExpr::Alternative &alt ) {
355 return alt.cost;
356 }
357
358 template< typename InputIterator, typename OutputIterator >
359 void TupleAssignSpotter::Options::findMinCost( InputIterator begin, InputIterator end, OutputIterator out ) {
360 using namespace ResolvExpr;
361 std::list<int> alternatives;
362
363 // select the alternatives that have the minimum parameter cost
364 Cost minCost = Cost::infinity;
365 unsigned int index = 0;
366 for ( InputIterator i = begin; i != end; ++i, index++ ) {
367 if ( *i < minCost ) {
368 minCost = *i;
369 alternatives.clear();
370 alternatives.push_back( index );
371 } else if ( *i == minCost ) {
372 alternatives.push_back( index );
373 }
374 }
375 std::copy( alternatives.begin(), alternatives.end(), out );
376 }
377
378 template< class InputIterator, class OutputIterator >
379 void TupleAssignSpotter::Options::lift_intersection( InputIterator begin, InputIterator end, OutputIterator out ) {
380 if ( begin == end ) return;
381 InputIterator test = begin;
382
383 if (++test == end)
384 { copy(begin->begin(), begin->end(), out); return; }
385
386
387 std::multiset<int> cur; // InputIterator::value_type::value_type
388 copy( begin->begin(), begin->end(), inserter( cur, cur.begin() ) );
389
390 while ( test != end ) {
391 std::multiset<int> temp;
392 set_intersection( cur.begin(), cur.end(), test->begin(), test->end(), inserter(temp,temp.begin()) );
393 cur.clear();
394 copy( temp.begin(), temp.end(), inserter(cur,cur.begin()));
395 ++test;
396 }
397
398 copy( cur.begin(), cur.end(), out );
399 return;
400 }
401
402 ResolvExpr::AltList TupleAssignSpotter::Options::get_option( std::list< ResolvExpr::AltList >::size_type index ) {
403 if ( index >= options.size() )
404 throw 0; // XXX
405 std::list< ResolvExpr::AltList >::iterator it = options.begin();
406 for ( std::list< ResolvExpr::AltList >::size_type i = 0; i < index; ++i, ++it );
407 return *it;
408 }
409} // namespace Tuples
410
411// Local Variables: //
412// tab-width: 4 //
413// mode: c++ //
414// compile-command: "make install" //
415// End: //
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