diff options
| -rw-r--r-- | src/pdarun.c | 6 | ||||
| -rw-r--r-- | src/pdarun.h | 6 |
2 files changed, 12 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. */ diff --git a/src/pdarun.h b/src/pdarun.h index dfabfea5..a5427576 100644 --- a/src/pdarun.h +++ b/src/pdarun.h @@ -317,6 +317,12 @@ struct pda_run long steps; long target_steps; + + + /* The shift count simply tracks the number of shifts that have happend. + * The commit shift count is the shift count when the last commit occurred. + * If we back up to this number of shifts then we decide we cannot proceed. + * The commit shift count is initialized to -1. */ long shift_count; long commit_shift_count; |