X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/2cec9080f685192e231333686b411fb524239a1b..23ce6f4cb35ec3b966d01f9236196665e58e3dd6:/src/state.c
diff --git a/src/state.c b/src/state.c
index d7289a3b..d3460c15 100644
--- a/src/state.c
+++ b/src/state.c
@@ -1,23 +1,22 @@
/* Type definitions for nondeterministic finite state machine for Bison.
- Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
+ Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see . */
#include
#include "system.h"
@@ -27,6 +26,7 @@
#include "complain.h"
#include "gram.h"
#include "state.h"
+#include "print-xml.h"
/*-------------------.
@@ -58,10 +58,12 @@ state *
transitions_to (transitions *shifts, symbol_number sym)
{
int j;
- for (j = 0; j < shifts->num; j++)
- if (TRANSITION_SYMBOL (shifts, j) == sym)
- return shifts->states[j];
- abort ();
+ for (j = 0; ; j++)
+ {
+ aver (j < shifts->num);
+ if (TRANSITION_SYMBOL (shifts, j) == sym)
+ return shifts->states[j];
+ }
}
@@ -102,7 +104,7 @@ reductions_new (int num, rule **reds)
size_t rules_size = num * sizeof *reds;
reductions *res = xmalloc (offsetof (reductions, rules) + rules_size);
res->num = num;
- res->look_ahead_tokens = NULL;
+ res->lookahead_tokens = NULL;
memcpy (res->rules, reds, rules_size);
return res;
}
@@ -132,8 +134,7 @@ state_new (symbol_number accessing_symbol,
state *res;
size_t items_size = nitems * sizeof *core;
- if (STATE_NUMBER_MAXIMUM <= nstates)
- abort ();
+ aver (nstates < STATE_NUMBER_MAXIMUM);
res = xmalloc (offsetof (state, items) + items_size);
res->number = nstates++;
@@ -143,6 +144,7 @@ state_new (symbol_number accessing_symbol,
res->errs = NULL;
res->consistent = 0;
res->solved_conflicts = NULL;
+ res->solved_conflicts_xml = NULL;
res->nitems = nitems;
memcpy (res->items, core, items_size);
@@ -174,7 +176,7 @@ state_free (state *s)
void
state_transitions_set (state *s, int num, state **trans)
{
- assert (!s->transitions);
+ aver (!s->transitions);
s->transitions = transitions_new (num, trans);
}
@@ -186,7 +188,7 @@ state_transitions_set (state *s, int num, state **trans)
void
state_reductions_set (state *s, int num, rule **reds)
{
- assert (!s->reductions);
+ aver (!s->reductions);
s->reductions = reductions_new (num, reds);
}
@@ -210,33 +212,32 @@ state_reduction_find (state *s, rule *r)
void
state_errs_set (state *s, int num, symbol **tokens)
{
- if (s->errs)
- abort ();
+ aver (!s->errs);
s->errs = errs_new (num, tokens);
}
-/*---------------------------------------------------.
-| Print on OUT all the look-ahead tokens such that S |
-| wants to reduce R. |
-`---------------------------------------------------*/
+/*--------------------------------------------------.
+| Print on OUT all the lookahead tokens such that S |
+| wants to reduce R. |
+`--------------------------------------------------*/
void
-state_rule_look_ahead_tokens_print (state *s, rule *r, FILE *out)
+state_rule_lookahead_tokens_print (state *s, rule *r, FILE *out)
{
/* Find the reduction we are handling. */
reductions *reds = s->reductions;
int red = state_reduction_find (s, r);
/* Print them if there are. */
- if (reds->look_ahead_tokens && red != -1)
+ if (reds->lookahead_tokens && red != -1)
{
bitset_iterator biter;
int k;
char const *sep = "";
fprintf (out, " [");
- BITSET_FOR_EACH (biter, reds->look_ahead_tokens[red], k, 0)
+ BITSET_FOR_EACH (biter, reds->lookahead_tokens[red], k, 0)
{
fprintf (out, "%s%s", sep, symbols[k]->tag);
sep = ", ";
@@ -245,6 +246,29 @@ state_rule_look_ahead_tokens_print (state *s, rule *r, FILE *out)
}
}
+void
+state_rule_lookahead_tokens_print_xml (state *s, rule *r,
+ FILE *out, int level)
+{
+ /* Find the reduction we are handling. */
+ reductions *reds = s->reductions;
+ int red = state_reduction_find (s, r);
+
+ /* Print them if there are. */
+ if (reds->lookahead_tokens && red != -1)
+ {
+ bitset_iterator biter;
+ int k;
+ xml_puts (out, level, "");
+ BITSET_FOR_EACH (biter, reds->lookahead_tokens[red], k, 0)
+ {
+ xml_printf (out, level + 1, "%s",
+ xml_escape (symbols[k]->tag));
+ }
+ xml_puts (out, level, "");
+ }
+}
+
/*---------------------.
| A state hash table. |
@@ -351,6 +375,52 @@ state_hash_lookup (size_t nitems, item_number *core)
return entry;
}
+
+/*--------------------------------------------------------.
+| Record S and all states reachable from S in REACHABLE. |
+`--------------------------------------------------------*/
+
+static void
+state_record_reachable_states (state *s, bitset reachable)
+{
+ if (bitset_test (reachable, s->number))
+ return;
+ bitset_set (reachable, s->number);
+ {
+ int i;
+ for (i = 0; i < s->transitions->num; ++i)
+ if (!TRANSITION_IS_DISABLED (s->transitions, i))
+ state_record_reachable_states (s->transitions->states[i], reachable);
+ }
+}
+
+void
+state_remove_unreachable_states (state_number old_to_new[])
+{
+ state_number nstates_reachable = 0;
+ bitset reachable = bitset_create (nstates, BITSET_FIXED);
+ state_record_reachable_states (states[0], reachable);
+ {
+ state_number i;
+ for (i = 0; i < nstates; ++i)
+ {
+ if (bitset_test (reachable, states[i]->number))
+ {
+ states[nstates_reachable] = states[i];
+ states[nstates_reachable]->number = nstates_reachable;
+ old_to_new[i] = nstates_reachable++;
+ }
+ else
+ {
+ state_free (states[i]);
+ old_to_new[i] = nstates;
+ }
+ }
+ }
+ nstates = nstates_reachable;
+ bitset_free (reachable);
+}
+
/* All the decorated states, indexed by the state number. */
state **states = NULL;