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cex: fix stack overflow

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* src/parse-simulation.c: Replace reference counting with
parse_state_retain everywhere.
(free_parse_state): Make this function iterative instead of
recursive. Long parse_state chains were causing stack exhaustion.

* tests/counterexample.at: Fix expectations.
This commit is contained in:
Vincent Imbimbo
2020-05-16 14:51:44 -04:00
committed by Akim Demaille
parent 66283fb625
commit 482b370540
2 changed files with 106 additions and 26 deletions
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79
tests/counterexample.at
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@@ -419,7 +419,84 @@ d : a | c A | d;
]])
AT_BISON_CHECK([-Wcounterexample input.y], [], [],
[[]])
[[Reduce-Reduce Conflict:
0: 3 b: . %empty
0: 4 c: . %empty
On Symbols: {A,}
First Example • c A A $end
First derivation $accept ::=[ a ::=[ b ::=[ • ] d ::=[ c A A ] ] $end ]
Second Example • c A A $end
Second derivation $accept ::=[ a ::=[ c ::=[ • ] d ::=[ c A A ] ] $end ]
Reduce-Reduce Conflict:
2: 3 b: . %empty
2: 4 c: . %empty
On Symbols: {A,}
time limit exceeded: 6.000000
First Example b • c A A $end
First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ b ::=[ • ] d ::=[ c A A ] ] ] ] $end ]
Second Example b • A $end
Second derivation $accept ::=[ a ::=[ b d ::=[ c ::=[ • ] A ] ] $end ]
Reduce-Reduce Conflict:
3: 3 b: . %empty
3: 4 c: . %empty
On Symbols: {A,}
time limit exceeded: 6.000000
First Example c • c A A $end
First derivation $accept ::=[ a ::=[ c d ::=[ a ::=[ b ::=[ • ] d ::=[ c A A ] ] ] ] $end ]
Second Example c • A $end
Second derivation $accept ::=[ a ::=[ c d ::=[ c ::=[ • ] A ] ] $end ]
Shift-Reduce Conflict:
6: 3 b: . %empty
6: 6 d: c . A
On Symbol: A
time limit exceeded: 6.000000
First Example b c • c A A $end
First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ a ::=[ b ::=[ • ] d ::=[ c A A ] ] ] ] ] ] $end ]
Second Example b c • A
Second derivation a ::=[ b d ::=[ c • A ] ]
Reduce-Reduce Conflict:
6: 3 b: . %empty
6: 4 c: . %empty
On Symbols: {A,}
First Example b c • c A A $end
First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ a ::=[ b ::=[ • ] d ::=[ c A A ] ] ] ] ] ] $end ]
Second Example b c • A $end
Second derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ c ::=[ • ] A ] ] ] ] $end ]
Shift-Reduce Conflict:
6: 4 c: . %empty
6: 6 d: c . A
On Symbol: A
First Example b c • A $end
First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ c ::=[ • ] A ] ] ] ] $end ]
Second Example b c • A
Second derivation a ::=[ b d ::=[ c • A ] ]
Reduce-Reduce Conflict:
7: 1 a: b d .
7: 7 d: d .
On Symbols: {$end,}
Example b d •
First derivation a ::=[ b d • ]
Second derivation a ::=[ b d ::=[ d • ] ]
Reduce-Reduce Conflict:
8: 2 a: c d .
8: 7 d: d .
On Symbols: {$end,}
Example c d •
First derivation a ::=[ c d • ]
Second derivation a ::=[ c d ::=[ d • ] ]
input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
input.y: warning: 6 reduce/reduce conflicts [-Wconflicts-rr]
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
input.y:6.15: warning: rule useless in parser due to conflicts [-Wother]
]])
AT_CLEANUP