diff options
Diffstat (limited to 'posix/regcomp.c')
| -rw-r--r-- | posix/regcomp.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/posix/regcomp.c b/posix/regcomp.c index f4eab3adbd..8ba7668e8b 100644 --- a/posix/regcomp.c +++ b/posix/regcomp.c @@ -1038,7 +1038,9 @@ optimize_utf8 (re_dfa_t *dfa) case BUF_LAST: break; default: - /* Word anchors etc. cannot be handled. */ + /* Word anchors etc. cannot be handled. It's okay to test + opr.ctx_type since constraints (for all DFA nodes) are + created by ORing one or more opr.ctx_type values. */ return; } break; @@ -1318,6 +1320,8 @@ calc_first (void *extra, bin_tree_t *node) node->node_idx = re_dfa_add_node (dfa, node->token); if (BE (node->node_idx == -1, 0)) return REG_ESPACE; + if (node->token.type == ANCHOR) + dfa->nodes[node->node_idx].constraint = node->token.opr.ctx_type; } return REG_NOERROR; } @@ -1446,22 +1450,17 @@ duplicate_node_closure (re_dfa_t *dfa, int top_org_node, int top_clone_node, destination. */ org_dest = dfa->edests[org_node].elems[0]; re_node_set_empty (dfa->edests + clone_node); - if (dfa->nodes[org_node].type == ANCHOR) + /* If the node is root_node itself, it means the epsilon clsoure + has a loop. Then tie it to the destination of the root_node. */ + if (org_node == root_node && clone_node != org_node) { - /* In case of the node has another constraint, append it. */ - if (org_node == root_node && clone_node != org_node) - { - /* ...but if the node is root_node itself, it means the - epsilon closure have a loop, then tie it to the - destination of the root_node. */ - ret = re_node_set_insert (dfa->edests + clone_node, - org_dest); - if (BE (ret < 0, 0)) - return REG_ESPACE; - break; - } - constraint |= dfa->nodes[org_node].opr.ctx_type; + ret = re_node_set_insert (dfa->edests + clone_node, org_dest); + if (BE (ret < 0, 0)) + return REG_ESPACE; + break; } + /* In case of the node has another constraint, add it. */ + constraint |= dfa->nodes[org_node].constraint; clone_dest = duplicate_node (dfa, org_dest, constraint); if (BE (clone_dest == -1, 0)) return REG_ESPACE; @@ -1479,7 +1478,7 @@ duplicate_node_closure (re_dfa_t *dfa, int top_org_node, int top_clone_node, clone_dest = search_duplicated_node (dfa, org_dest, constraint); if (clone_dest == -1) { - /* There are no such a duplicated node, create a new one. */ + /* There is no such duplicated node, create a new one. */ reg_errcode_t err; clone_dest = duplicate_node (dfa, org_dest, constraint); if (BE (clone_dest == -1, 0)) @@ -1494,7 +1493,7 @@ duplicate_node_closure (re_dfa_t *dfa, int top_org_node, int top_clone_node, } else { - /* There are a duplicated node which satisfy the constraint, + /* There is a duplicated node which satisfies the constraint, use it to avoid infinite loop. */ ret = re_node_set_insert (dfa->edests + clone_node, clone_dest); if (BE (ret < 0, 0)) @@ -1543,8 +1542,7 @@ duplicate_node (re_dfa_t *dfa, int org_idx, unsigned int constraint) if (BE (dup_idx != -1, 1)) { dfa->nodes[dup_idx].constraint = constraint; - if (dfa->nodes[org_idx].type == ANCHOR) - dfa->nodes[dup_idx].constraint |= dfa->nodes[org_idx].opr.ctx_type; + dfa->nodes[dup_idx].constraint |= dfa->nodes[org_idx].constraint; dfa->nodes[dup_idx].duplicated = 1; /* Store the index of the original node. */ @@ -1624,7 +1622,6 @@ static reg_errcode_t calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa, int node, int root) { reg_errcode_t err; - unsigned int constraint; int i, incomplete; re_node_set eclosure; incomplete = 0; @@ -1636,15 +1633,14 @@ calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa, int node, int root) We reference this value to avoid infinite loop. */ dfa->eclosures[node].nelem = -1; - constraint = ((dfa->nodes[node].type == ANCHOR) - ? dfa->nodes[node].opr.ctx_type : 0); - /* If the current node has constraints, duplicate all nodes. - Since they must inherit the constraints. */ - if (constraint + /* If the current node has constraints, duplicate all nodes + since they must inherit the constraints. */ + if (dfa->nodes[node].constraint && dfa->edests[node].nelem && !dfa->nodes[dfa->edests[node].elems[0]].duplicated) { - err = duplicate_node_closure (dfa, node, node, node, constraint); + err = duplicate_node_closure (dfa, node, node, node, + dfa->nodes[node].constraint); if (BE (err != REG_NOERROR, 0)) return err; } |