/* Output the generated parsing program for Bison.
- Copyright (C) 1984, 1986, 1989, 1992, 2000-2006, 2009-2012 Free
+ Copyright (C) 1984, 1986, 1989, 1992, 2000-2006, 2009-2013 Free
Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "tables.h"
/* Several tables are indexed both by state and nonterminal numbers.
- We call such an index a `vector'; i.e., a vector is either a state
+ We call such an index a 'vector'; i.e., a vector is either a state
or a nonterminal number.
Of course vector_number_t ought to be wide enough to contain
/* For a given state, N = ACTROW[SYMBOL]:
- If N = 0, stands for `run the default action'.
- If N = MIN, stands for `raise a syntax error'.
- If N > 0, stands for `shift SYMBOL and go to n'.
- If N < 0, stands for `reduce -N'. */
+ If N = 0, stands for 'run the default action'.
+ If N = MIN, stands for 'raise a syntax error'.
+ If N > 0, stands for 'shift SYMBOL and go to n'.
+ If N < 0, stands for 'reduce -N'. */
typedef int action_number;
#define ACTION_NUMBER_MINIMUM INT_MIN
static action_number *actrow;
/* FROMS and TOS are reordered to be compressed. ORDER[VECTOR] is the
- new vector number of VECTOR. We skip `empty' vectors (i.e.,
- TALLY[VECTOR] = 0), and call these `entries'. */
+ new vector number of VECTOR. We skip 'empty' vectors (i.e.,
+ TALLY[VECTOR] = 0), and call these 'entries'. */
static vector_number *order;
static int nentries;
save_row (state_number s)
{
symbol_number i;
- size_t count;
- base_number *sp;
- base_number *sp1;
- base_number *sp2;
- unsigned int *sp3;
/* Number of non default actions in S. */
- count = 0;
+ size_t count = 0;
for (i = 0; i < ntokens; i++)
if (actrow[i] != 0)
count++;
- if (count == 0)
- return;
-
- /* Allocate non defaulted actions. */
- froms[s] = sp = sp1 = xnmalloc (count, sizeof *sp1);
- tos[s] = sp2 = xnmalloc (count, sizeof *sp2);
- conflict_tos[s] = sp3 =
- nondeterministic_parser ? xnmalloc (count, sizeof *sp3) : NULL;
-
- /* Store non defaulted actions. */
- for (i = 0; i < ntokens; i++)
- if (actrow[i] != 0)
- {
- *sp1++ = i;
- *sp2++ = actrow[i];
- if (nondeterministic_parser)
- *sp3++ = conflrow[i];
- }
+ if (count)
+ {
+ /* Allocate non defaulted actions. */
+ base_number *sp1 = froms[s] = xnmalloc (count, sizeof *sp1);
+ base_number *sp2 = tos[s] = xnmalloc (count, sizeof *sp2);
+ unsigned int *sp3 = conflict_tos[s] =
+ nondeterministic_parser ? xnmalloc (count, sizeof *sp3) : NULL;
+
+ /* Store non defaulted actions. */
+ for (i = 0; i < ntokens; i++)
+ if (actrow[i] != 0)
+ {
+ *sp1++ = i;
+ *sp2++ = actrow[i];
+ if (nondeterministic_parser)
+ *sp3++ = conflrow[i];
+ }
- tally[s] = count;
- width[s] = sp1[-1] - sp[0] + 1;
+ tally[s] = count;
+ width[s] = sp1[-1] - froms[s][0] + 1;
+ }
}
static void
token_actions (void)
{
- state_number i;
- symbol_number j;
- rule_number r;
-
int nconflict = nondeterministic_parser ? conflicts_total_count () : 0;
yydefact = xnmalloc (nstates, sizeof *yydefact);
/* Find the rules which are reduced. */
if (!nondeterministic_parser)
- for (r = 0; r < nrules; ++r)
- rules[r].useful = false;
-
- for (i = 0; i < nstates; ++i)
{
- rule *default_reduction = action_row (states[i]);
- yydefact[i] = default_reduction ? default_reduction->number + 1 : 0;
- save_row (i);
-
- /* Now that the parser was computed, we can find which rules are
- really reduced, and which are not because of SR or RR
- conflicts. */
- if (!nondeterministic_parser)
- {
- for (j = 0; j < ntokens; ++j)
- if (actrow[j] < 0 && actrow[j] != ACTION_NUMBER_MINIMUM)
- rules[item_number_as_rule_number (actrow[j])].useful = true;
- if (yydefact[i])
- rules[yydefact[i] - 1].useful = true;
- }
+ rule_number r;
+ for (r = 0; r < nrules; ++r)
+ rules[r].useful = false;
}
+ {
+ state_number i;
+ for (i = 0; i < nstates; ++i)
+ {
+ rule *default_reduction = action_row (states[i]);
+ yydefact[i] = default_reduction ? default_reduction->number + 1 : 0;
+ save_row (i);
+
+ /* Now that the parser was computed, we can find which rules are
+ really reduced, and which are not because of SR or RR
+ conflicts. */
+ if (!nondeterministic_parser)
+ {
+ symbol_number j;
+ for (j = 0; j < ntokens; ++j)
+ if (actrow[j] < 0 && actrow[j] != ACTION_NUMBER_MINIMUM)
+ rules[item_number_as_rule_number (actrow[j])].useful = true;
+ if (yydefact[i])
+ rules[yydefact[i] - 1].useful = true;
+ }
+ }
+ }
free (actrow);
free (conflrow);
}
}
-/*-------------------------------------------------------------.
-| Return `the' most common destination GOTO on SYM (a nterm). |
-`-------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| The default state for SYM: the state which is 'the' most common |
+| GOTO destination on SYM (an nterm). |
+`----------------------------------------------------------------*/
static state_number
default_goto (symbol_number sym, size_t state_count[])
{
- state_number s;
- goto_number i;
- goto_number m = goto_map[sym - ntokens];
- goto_number n = goto_map[sym - ntokens + 1];
- state_number default_state = -1;
- size_t max = 0;
-
- if (m == n)
- return -1;
+ goto_number begin = goto_map[sym - ntokens];
+ goto_number end = goto_map[sym - ntokens + 1];
+ state_number res = -1;
- for (s = 0; s < nstates; s++)
- state_count[s] = 0;
+ if (begin != end)
+ {
+ size_t max = 0;
+ goto_number i;
+ state_number s;
- for (i = m; i < n; i++)
- state_count[to_state[i]]++;
+ for (s = 0; s < nstates; s++)
+ state_count[s] = 0;
- for (s = 0; s < nstates; s++)
- if (state_count[s] > max)
- {
- max = state_count[s];
- default_state = s;
- }
+ for (i = begin; i < end; i++)
+ state_count[to_state[i]]++;
- return default_state;
+ for (s = 0; s < nstates; s++)
+ if (max < state_count[s])
+ {
+ max = state_count[s];
+ res = s;
+ }
+ }
+ return res;
}
matching_state (vector_number vector)
{
vector_number i = order[vector];
- size_t t;
- int w;
- int prev;
-
/* If VECTOR is a nterm, return -1. */
- if (nstates <= i)
- return -1;
-
- t = tally[i];
- w = width[i];
-
- /* If VECTOR has GLR conflicts, return -1 */
- if (conflict_tos[i] != NULL)
+ if (i < nstates)
{
- int j;
- for (j = 0; j < t; j += 1)
- if (conflict_tos[i][j] != 0)
- return -1;
- }
+ size_t t = tally[i];
+ int w = width[i];
+ int prev;
- for (prev = vector - 1; prev >= 0; prev--)
- {
- vector_number j = order[prev];
- int k;
- int match = 1;
-
- /* Given how ORDER was computed, if the WIDTH or TALLY is
- different, there cannot be a matching state. */
- if (width[j] != w || tally[j] != t)
- return -1;
-
- for (k = 0; match && k < t; k++)
- if (tos[j][k] != tos[i][k]
- || froms[j][k] != froms[i][k]
- || (conflict_tos[j] != NULL && conflict_tos[j][k] != 0))
- match = 0;
-
- if (match)
- return j;
- }
+ /* If VECTOR has GLR conflicts, return -1 */
+ if (conflict_tos[i] != NULL)
+ {
+ int j;
+ for (j = 0; j < t; j += 1)
+ if (conflict_tos[i][j] != 0)
+ return -1;
+ }
+ for (prev = vector - 1; 0 <= prev; prev--)
+ {
+ vector_number j = order[prev];
+ /* Given how ORDER was computed, if the WIDTH or TALLY is
+ different, there cannot be a matching state. */
+ if (width[j] != w || tally[j] != t)
+ return -1;
+ else
+ {
+ bool match = true;
+ int k;
+ for (k = 0; match && k < t; k++)
+ if (tos[j][k] != tos[i][k]
+ || froms[j][k] != froms[i][k]
+ || (conflict_tos[j] != NULL && conflict_tos[j][k] != 0))
+ match = false;
+ if (match)
+ return j;
+ }
+ }
+ }
return -1;
}
projects / bison.git / blobdiff