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Add %define lr.keep_unreachable_states.

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* NEWS (2.3a+): Mention it in the entry for unreachable state removal.
* doc/bison.texinfo (Decl Summary): Mention it in the %define entry.
* src/main.c (main): Implement it.
* tests/conflicts.at (Unreachable States After Conflict Resolution):
Extend to test it, and fix a typo.
This commit is contained in:
Joel E. Denny
2007-10-19 06:14:44 +00:00
parent 88c7874756
commit 31984206a7
5 changed files with 86 additions and 12 deletions
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15
tests/conflicts.at
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@@ -636,7 +636,7 @@ AT_DATA([[input.y]],
start: resolved_conflict 'a' reported_conflicts 'a' ;
/* S/R conflict resolved as shift, so the state with item
/* S/R conflict resolved as reduce, so the state with item
* (resolved_conflict: 'a' . unreachable1) and all it transition successors are
* unreachable, and the associated production is useless. */
resolved_conflict:
@@ -812,6 +812,19 @@ state 7
$default reduce using rule 1 (start)
]])
AT_DATA([[input-keep.y]],
[[%define lr.keep_unreachable_states
]])
AT_CHECK([[cat input.y >> input-keep.y]])
AT_CHECK([[bison input-keep.y]], 0, [],
[[input-keep.y: conflicts: 2 shift/reduce, 2 reduce/reduce
input-keep.y:22.4: warning: rule never reduced because of conflicts: unreachable1: /* empty */
input-keep.y:26.16: warning: rule never reduced because of conflicts: unreachable2: /* empty */
input-keep.y:32.5-7: warning: rule never reduced because of conflicts: reported_conflicts: 'a'
input-keep.y:33.4: warning: rule never reduced because of conflicts: reported_conflicts: /* empty */
]])
AT_CLEANUP