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| author | Adrian Thurston <thurston@complang.org> | 2016-03-23 15:23:07 +0100 |
|---|---|---|
| committer | Adrian Thurston <thurston@complang.org> | 2016-03-23 15:23:07 +0100 |
| commit | 2afdfef96c9de759a24ba4cb56928c48e1d86bd3 (patch) | |
| tree | b00080639d90458badc067b1d37a6c3936070ca0 /src/pdarun.c | |
| parent | b9d35edf909d3b68461e27a8985acb0df25d19b2 (diff) | |
| download | colm-2afdfef96c9de759a24ba4cb56928c48e1d86bd3.tar.gz | |
commit shift count needs to be initialized to -1
An initial value of zero for commit shift count means we can erroneously fail a
parse when we back up to zero shifts.
Diffstat (limited to 'src/pdarun.c')
| -rw-r--r-- | src/pdarun.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/pdarun.c b/src/pdarun.c index dcbab4cb..52b203f5 100644 --- a/src/pdarun.c +++ b/src/pdarun.c @@ -1312,6 +1312,11 @@ void colm_pda_init( program_t *prg, struct pda_run *pda_run, struct pda_tables * pda_run->target_steps = -1; pda_run->reducer = reducer; + /* An initial commit shift count of -1 means we won't ever back up to zero + * shifts and think parsing cannot continue. */ + pda_run->shift_count = 0; + pda_run->commit_shift_count = -1; + if ( reducer ) { init_pool_alloc( &pda_run->local_pool, sizeof(parse_tree_t) + prg->rtd->commit_union_sz(reducer) ); @@ -1508,6 +1513,7 @@ again: */ if ( pda_run->pda_tables->commit_len[pos] != 0 ) { + debug( prg, REALM_PARSE, "commit point\n" ); pda_run->commit_shift_count = pda_run->shift_count; /* Not in a reverting context and the parser result is not used. */ |