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The report is the best place to show the details about
counterexamples, since we have the state right under the nose.
For instance:
State 7
1 exp: exp . "⊕" exp
2 | exp . "+" exp
2 | exp "+" exp . [$end, "+", "⊕"]
3 | exp . "+" exp
3 | exp "+" exp . [$end, "+", "⊕"]
"⊕" shift, and go to state 6
$end reduce using rule 2 (exp)
$end [reduce using rule 3 (exp)]
"+" reduce using rule 2 (exp)
"+" [reduce using rule 3 (exp)]
"⊕" [reduce using rule 2 (exp)]
"⊕" [reduce using rule 3 (exp)]
$default reduce using rule 2 (exp)
Conflict between rule 2 and token "+" resolved as reduce (%left "+").
Shift/reduce conflict on token "⊕":
2 exp: exp "+" exp .
1 exp: exp . "⊕" exp
Example exp "+" exp • "⊕" exp
First derivation exp ::=[ exp ::=[ exp "+" exp • ] "⊕" exp ]
Example exp "+" exp • "⊕" exp
Second derivation exp ::=[ exp "+" exp ::=[ exp • "⊕" exp ] ]
Reduce/reduce conflict on tokens $end, "+", "⊕":
2 exp: exp "+" exp .
3 exp: exp "+" exp .
Example exp "+" exp •
First derivation exp ::=[ exp "+" exp • ]
Example exp "+" exp •
Second derivation exp ::=[ exp "+" exp • ]
Shift/reduce conflict on token "⊕":
3 exp: exp "+" exp .
1 exp: exp . "⊕" exp
Example exp "+" exp • "⊕" exp
First derivation exp ::=[ exp ::=[ exp "+" exp • ] "⊕" exp ]
Example exp "+" exp • "⊕" exp
Second derivation exp ::=[ exp "+" exp ::=[ exp • "⊕" exp ] ]
* src/conflicts.h, src/conflicts.c (has_conflicts): New.
* src/counterexample.h, src/counterexample.c (print_counterexample):
Add a `prefix` argument.
(counterexample_report_shift_reduce)
(counterexample_report_reduce_reduce): Show the items when there's a
prefix.
* src/state-item.h, src/state-item.c (print_state_item):
Add a `prefix` argument.
* src/derivation.h, src/derivation.c (derivation_print)
(derivation_print_leaves): Add a prefix argument.
* src/print.c (print_state): When -Wcex is enabled, show the
conflicts.
* tests/report.at: Adjust.
31 lines
1.0 KiB
C
31 lines
1.0 KiB
C
/* Conflict counterexample generation
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COUNTEREXAMPLE_H
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# define COUNTEREXAMPLE_H
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# include "state-item.h"
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void counterexample_init (void);
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void counterexample_free (void);
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void counterexample_report_state (const state *s, FILE *out, const char *prefix);
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#endif /* COUNTEREXAMPLE_H */
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