-/* Type definitions for nondeterministic finite state machine for bison,
- Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+/* Type definitions for nondeterministic finite state machine for Bison.
+ Copyright (C) 2001, 2002 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "system.h"
-#include "hash.h"
+
+#include <hash.h>
+
#include "complain.h"
#include "gram.h"
#include "state.h"
| Create a new array of N shifts/gotos. |
`---------------------------------------*/
-#define SHIFTS_ALLOC(Nshifts) \
- (shifts *) xcalloc ((unsigned) (sizeof (shifts) \
- + (Nshifts - 1) * sizeof (short)), 1)
+#define TRANSITIONS_ALLOC(Num) \
+ (transitions *) xcalloc ((sizeof (transitions) \
+ + (Num - 1) * sizeof (state *)), \
+ 1)
-shifts *
-shifts_new (int n)
+static transitions *
+transitions_new (int num, state **the_states)
{
- shifts *res = SHIFTS_ALLOC (n);
- res->nshifts = n;
+ transitions *res = TRANSITIONS_ALLOC (num);
+ res->num = num;
+ memcpy (res->states, the_states, num * sizeof (the_states[0]));
return res;
}
+/*-------------------------------------------------------------------.
+| Return the state such these TRANSITIONS contain a shift/goto to it |
+| on S. Abort if none found. |
+`-------------------------------------------------------------------*/
+
+state *
+transitions_to (transitions *shifts, symbol_number s)
+{
+ int j;
+ for (j = 0; j < shifts->num; j++)
+ if (TRANSITION_SYMBOL (shifts, j) == s)
+ return shifts->states[j];
+ abort ();
+}
/*--------------------.
| Create a new array of N errs. |
`-------------------------------*/
-#define ERRS_ALLOC(Nerrs) \
- (errs *) xcalloc ((unsigned) (sizeof (errs) \
- + (Nerrs - 1) * sizeof (short)), 1)
-
-
-errs *
-errs_new (int n)
-{
- errs *res = ERRS_ALLOC (n);
- res->nerrs = n;
- return res;
-}
+#define ERRS_ALLOC(Nerrs) \
+ ((errs *) xcalloc ((sizeof (errs) + (Nerrs - 1) * sizeof (symbol *)), 1))
errs *
-errs_dup (errs *src)
+errs_new (int num, symbol **tokens)
{
- errs *res = errs_new (src->nerrs);
- memcpy (res->errs, src->errs, src->nerrs * sizeof (src->errs[0]));
+ errs *res = ERRS_ALLOC (num);
+ res->num = num;
+ memcpy (res->symbols, tokens, num * sizeof (tokens[0]));
return res;
}
| Create a new array of N reductions. |
`-------------------------------------*/
-#define REDUCTIONS_ALLOC(Nreductions) \
- (reductions *) xcalloc ((unsigned) (sizeof (reductions) \
- + (Nreductions - 1) * sizeof (short)), 1)
+#define REDUCTIONS_ALLOC(Nreductions) \
+ (reductions *) xcalloc ((sizeof (reductions) \
+ + (Nreductions - 1) * sizeof (rule *)), 1)
-reductions *
-reductions_new (int n)
+static reductions *
+reductions_new (int num, rule **reds)
{
- reductions *res = REDUCTIONS_ALLOC (n);
- res->nreds = n;
+ reductions *res = REDUCTIONS_ALLOC (num);
+ res->num = num;
+ memcpy (res->rules, reds, num * sizeof (reds[0]));
+ res->lookaheads = NULL;
return res;
}
`---------*/
-state_number_t nstates = 0;
+state_number nstates = 0;
/* FINAL_STATE is properly set by new_state when it recognizes its
- accessing symbol: EOF. */
-state_t *final_state = NULL;
+ accessing symbol: $end. */
+state *final_state = NULL;
#define STATE_ALLOC(Nitems) \
- (state_t *) xcalloc ((unsigned) (sizeof (state_t) \
- + (Nitems - 1) * sizeof (item_number_t)), 1)
+ (state *) xcalloc ((sizeof (state) \
+ + (Nitems - 1) * sizeof (item_number)), \
+ 1)
-/*------------------------------------------------------------.
-| Create a new state with ACCESSING_SYMBOL, for those items. |
-`------------------------------------------------------------*/
+/*------------------------------------------------------------------.
+| Create a new state with ACCESSING_SYMBOL, for those items. Store |
+| it in the state hash table. |
+`------------------------------------------------------------------*/
-state_t *
-state_new (symbol_number_t accessing_symbol,
- size_t core_size, item_number_t *core)
+state *
+state_new (symbol_number accessing_symbol,
+ size_t core_size, item_number *core)
{
- state_t *res;
+ state *res;
- if (nstates >= STATE_NUMBER_MAX)
- fatal (_("too many states (max %d)"), STATE_NUMBER_MAX);
+ if (STATE_NUMBER_MAXIMUM <= nstates)
+ abort ();
res = STATE_ALLOC (core_size);
res->accessing_symbol = accessing_symbol;
res->nitems = core_size;
memcpy (res->items, core, core_size * sizeof (core[0]));
+ state_hash_insert (res);
+
return res;
}
-/*--------------------------------------------------------------.
-| Print on OUT all the lookaheads such that this STATE wants to |
-| reduce this RULE. |
-`--------------------------------------------------------------*/
+/*---------.
+| Free S. |
+`---------*/
+
+static void
+state_free (state *s)
+{
+ free (s->transitions);
+ free (s->reductions);
+ free (s->errs);
+ free (s);
+}
+
+
+/*---------------------------.
+| Set the transitions of S. |
+`---------------------------*/
+
+void
+state_transitions_set (state *s, int num, state **trans)
+{
+ if (s->transitions)
+ abort ();
+ s->transitions = transitions_new (num, trans);
+}
+
+
+/*--------------------------.
+| Set the reductions of S. |
+`--------------------------*/
+
+void
+state_reductions_set (state *s, int num, rule **reds)
+{
+ if (s->reductions)
+ abort ();
+ s->reductions = reductions_new (num, reds);
+}
+
+
+int
+state_reduction_find (state *s, rule *r)
+{
+ int i;
+ reductions *reds = s->reductions;
+ for (i = 0; i < reds->num; ++i)
+ if (reds->rules[i] == r)
+ return i;
+ return -1;
+}
+
+
+/*--------------------.
+| Set the errs of S. |
+`--------------------*/
void
-state_rule_lookaheads_print (state_t *state, rule_t *rule, FILE *out)
+state_errs_set (state *s, int num, symbol **tokens)
{
- int j, k;
- int nlookaheads = 0;
- /* Count the number of lookaheads corresponding to this rule. */
- for (j = 0; j < state->nlookaheads; ++j)
- for (k = 0; k < ntokens; ++k)
- if (bitset_test (state->lookaheads[j], k)
- && state->lookaheads_rule[j]->number == rule->number)
- nlookaheads++;
+ if (s->errs)
+ abort ();
+ s->errs = errs_new (num, tokens);
+}
+
+
+
+/*-----------------------------------------------------.
+| Print on OUT all the lookaheads such that S wants to |
+| reduce R. |
+`-----------------------------------------------------*/
+
+void
+state_rule_lookaheads_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 (nlookaheads)
+ if (reds->lookaheads && red != -1)
{
+ bitset_iterator biter;
+ int k;
+ int not_first = 0;
fprintf (out, " [");
- for (j = 0; j < state->nlookaheads; ++j)
- for (k = 0; k < ntokens; ++k)
- if (bitset_test (state->lookaheads[j], k)
- && state->lookaheads_rule[j]->number == rule->number)
- fprintf (out, "%s%s",
- symbol_tag_get (symbols[k]),
- --nlookaheads ? ", " : "");
+ BITSET_FOR_EACH (biter, reds->lookaheads[red], k, 0)
+ fprintf (out, "%s%s",
+ not_first++ ? ", " : "",
+ symbols[k]->tag);
fprintf (out, "]");
}
}
/* Two states are equal if they have the same core items. */
static bool
-state_compare (const state_t *s1, const state_t *s2)
+state_compare (state const *s1, state const *s2)
{
int i;
if (s1->nitems != s2->nitems)
- return FALSE;
+ return false;
for (i = 0; i < s1->nitems; ++i)
if (s1->items[i] != s2->items[i])
- return FALSE;
+ return false;
- return TRUE;
+ return true;
}
static unsigned int
-state_hash (const state_t *state, unsigned int tablesize)
+state_hash (state const *s, unsigned int tablesize)
{
/* Add up the state's item numbers to get a hash key. */
int key = 0;
int i;
- for (i = 0; i < state->nitems; ++i)
- key += state->items[i];
+ for (i = 0; i < s->nitems; ++i)
+ key += s->items[i];
return key % tablesize;
}
}
-/*---------------------------------------.
-| Insert STATE in the state hash table. |
-`---------------------------------------*/
+/*-----------------------------------.
+| Insert S in the state hash table. |
+`-----------------------------------*/
void
-state_hash_insert (state_t *state)
+state_hash_insert (state *s)
{
- hash_insert (state_table, state);
+ hash_insert (state_table, s);
}
| not exist yet, return NULL. |
`------------------------------------------------------------------*/
-state_t *
-state_hash_lookup (size_t core_size, item_number_t *core)
+state *
+state_hash_lookup (size_t core_size, item_number *core)
{
- state_t *probe = STATE_ALLOC (core_size);
- state_t *entry;
+ state *probe = STATE_ALLOC (core_size);
+ state *entry;
probe->nitems = core_size;
memcpy (probe->items, core, core_size * sizeof (core[0]));
}
/* All the decorated states, indexed by the state number. */
-state_t **states = NULL;
+state **states = NULL;
/*----------------------.
void
states_free (void)
{
- state_number_t i;
-
+ state_number i;
for (i = 0; i < nstates; ++i)
- {
- free (states[i]->shifts);
- XFREE (states[i]->reductions);
- free (states[i]->errs);
- free (states[i]);
- }
- XFREE (states);
+ state_free (states[i]);
+ free (states);
}
projects / bison.git / blobdiff