-/* Compute look-ahead criteria for bison,
+/* Compute look-ahead criteria for Bison.
+
Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
Free Software Foundation, Inc.
tokens they accept. */
#include "system.h"
-#include "bitset.h"
-#include "bitsetv.h"
-#include "relation.h"
-#include "quotearg.h"
-#include "symtab.h"
-#include "gram.h"
-#include "reader.h"
+
+#include <bitset.h>
+#include <bitsetv.h>
+#include <quotearg.h>
+
#include "LR0.h"
#include "complain.h"
-#include "lalr.h"
-#include "nullable.h"
#include "derives.h"
#include "getargs.h"
+#include "gram.h"
+#include "lalr.h"
+#include "nullable.h"
+#include "reader.h"
+#include "relation.h"
+#include "symtab.h"
-goto_number_t *goto_map = NULL;
-static goto_number_t ngotos = 0;
-state_number_t *from_state = NULL;
-state_number_t *to_state = NULL;
+goto_number *goto_map = NULL;
+static goto_number ngotos = 0;
+state_number *from_state = NULL;
+state_number *to_state = NULL;
/* Linked list of goto numbers. */
-typedef struct goto_list_s
+typedef struct goto_list
{
- struct goto_list_s *next;
- goto_number_t value;
-} goto_list_t;
+ struct goto_list *next;
+ goto_number value;
+} goto_list;
/* LA is a LR by NTOKENS matrix of bits. LA[l, i] is 1 if the rule
comment is hardly needed. <grin>. */
static bitsetv F = NULL;
-static goto_number_t **includes;
-static goto_list_t **lookback;
+static goto_number **includes;
+static goto_list **lookback;
static void
set_goto_map (void)
{
- state_number_t state;
- goto_number_t *temp_map;
+ state_number s;
+ goto_number *temp_map;
- goto_map = XCALLOC (goto_number_t, nvars + 1) - ntokens;
- temp_map = XCALLOC (goto_number_t, nvars + 1) - ntokens;
+ CALLOC (goto_map, nvars + 1);
+ CALLOC (temp_map, nvars + 1);
ngotos = 0;
- for (state = 0; state < nstates; ++state)
+ for (s = 0; s < nstates; ++s)
{
- transitions_t *sp = states[state]->transitions;
+ transitions *sp = states[s]->transitions;
int i;
for (i = sp->num - 1; i >= 0 && TRANSITION_IS_GOTO (sp, i); --i)
{
- if (ngotos == GOTO_NUMBER_MAX)
- fatal (_("too many gotos (max %d)"), GOTO_NUMBER_MAX);
-
+ if (ngotos >= GOTO_NUMBER_MAXIMUM)
+ abort ();
ngotos++;
- goto_map[TRANSITION_SYMBOL (sp, i)]++;
+ goto_map[TRANSITION_SYMBOL (sp, i) - ntokens]++;
}
}
int i;
for (i = ntokens; i < nsyms; i++)
{
- temp_map[i] = k;
- k += goto_map[i];
+ temp_map[i - ntokens] = k;
+ k += goto_map[i - ntokens];
}
for (i = ntokens; i < nsyms; i++)
- goto_map[i] = temp_map[i];
+ goto_map[i - ntokens] = temp_map[i - ntokens];
- goto_map[nsyms] = ngotos;
- temp_map[nsyms] = ngotos;
+ goto_map[nsyms - ntokens] = ngotos;
+ temp_map[nsyms - ntokens] = ngotos;
}
- from_state = XCALLOC (state_number_t, ngotos);
- to_state = XCALLOC (state_number_t, ngotos);
+ CALLOC (from_state, ngotos);
+ CALLOC (to_state, ngotos);
- for (state = 0; state < nstates; ++state)
+ for (s = 0; s < nstates; ++s)
{
- transitions_t *sp = states[state]->transitions;
+ transitions *sp = states[s]->transitions;
int i;
for (i = sp->num - 1; i >= 0 && TRANSITION_IS_GOTO (sp, i); --i)
{
- int k = temp_map[TRANSITION_SYMBOL (sp, i)]++;
- from_state[k] = state;
+ int k = temp_map[TRANSITION_SYMBOL (sp, i) - ntokens]++;
+ from_state[k] = s;
to_state[k] = sp->states[i]->number;
}
}
- XFREE (temp_map + ntokens);
+ XFREE (temp_map);
}
`----------------------------------------------------------*/
static int
-map_goto (state_number_t state, symbol_number_t symbol)
+map_goto (state_number s0, symbol_number sym)
{
int high;
int low;
int middle;
- state_number_t s;
+ state_number s;
- low = goto_map[symbol];
- high = goto_map[symbol + 1] - 1;
+ low = goto_map[sym - ntokens];
+ high = goto_map[sym - ntokens + 1] - 1;
- while (low <= high)
+ for (;;)
{
+ if (high < low)
+ abort ();
middle = (low + high) / 2;
s = from_state[middle];
- if (s == state)
+ if (s == s0)
return middle;
- else if (s < state)
+ else if (s < s0)
low = middle + 1;
else
high = middle - 1;
}
-
- assert (0);
- /* NOTREACHED */
- return 0;
}
static void
initialize_F (void)
{
- goto_number_t **reads = XCALLOC (goto_number_t *, ngotos);
- goto_number_t *edge = XCALLOC (goto_number_t, ngotos + 1);
+ goto_number **reads = CALLOC (reads, ngotos);
+ goto_number *edge = CALLOC (edge, ngotos + 1);
int nedges = 0;
int i;
for (i = 0; i < ngotos; i++)
{
- state_number_t stateno = to_state[i];
- transitions_t *sp = states[stateno]->transitions;
+ state_number stateno = to_state[i];
+ transitions *sp = states[stateno]->transitions;
int j;
FOR_EACH_SHIFT (sp, j)
for (; j < sp->num; j++)
{
- symbol_number_t symbol = TRANSITION_SYMBOL (sp, j);
- if (nullable[symbol])
- edge[nedges++] = map_goto (stateno, symbol);
+ symbol_number sym = TRANSITION_SYMBOL (sp, j);
+ if (nullable[sym - ntokens])
+ edge[nedges++] = map_goto (stateno, sym);
}
if (nedges)
{
- reads[i] = XCALLOC (goto_number_t, nedges + 1);
+ CALLOC (reads[i], nedges + 1);
memcpy (reads[i], edge, nedges * sizeof (edge[0]));
reads[i][nedges] = -1;
nedges = 0;
static void
-add_lookback_edge (state_t *state, rule_t *rule, int gotono)
+add_lookback_edge (state *s, rule *r, int gotono)
{
- int r = state_reduction_find (state, rule);
- goto_list_t *sp = XCALLOC (goto_list_t, 1);
- sp->next = lookback[(state->reductions->lookaheads - LA) + r];
+ int ri = state_reduction_find (s, r);
+ goto_list *sp = MALLOC (sp, 1);
+ sp->next = lookback[(s->reductions->lookaheads - LA) + ri];
sp->value = gotono;
- lookback[(state->reductions->lookaheads - LA) + r] = sp;
+ lookback[(s->reductions->lookaheads - LA) + ri] = sp;
}
static void
build_relations (void)
{
- goto_number_t *edge = XCALLOC (goto_number_t, ngotos + 1);
- state_number_t *states1 = XCALLOC (state_number_t, ritem_longest_rhs () + 1);
+ goto_number *edge = CALLOC (edge, ngotos + 1);
+ state_number *states1 = CALLOC (states1, ritem_longest_rhs () + 1);
int i;
- includes = XCALLOC (goto_number_t *, ngotos);
+ CALLOC (includes, ngotos);
for (i = 0; i < ngotos; i++)
{
int nedges = 0;
- symbol_number_t symbol1 = states[to_state[i]]->accessing_symbol;
- rule_t **rulep;
+ symbol_number symbol1 = states[to_state[i]]->accessing_symbol;
+ rule **rulep;
- for (rulep = derives[symbol1]; *rulep; rulep++)
+ for (rulep = derives[symbol1 - ntokens]; *rulep; rulep++)
{
int done;
int length = 1;
- item_number_t *rp;
- state_t *state = states[from_state[i]];
- states1[0] = state->number;
+ item_number *rp;
+ state *s = states[from_state[i]];
+ states1[0] = s->number;
for (rp = (*rulep)->rhs; *rp >= 0; rp++)
{
- state = transitions_to (state->transitions,
- item_number_as_symbol_number (*rp));
- states1[length++] = state->number;
+ s = transitions_to (s->transitions,
+ item_number_as_symbol_number (*rp));
+ states1[length++] = s->number;
}
- if (!state->consistent)
- add_lookback_edge (state, *rulep, i);
+ if (!s->consistent)
+ add_lookback_edge (s, *rulep, i);
length--;
done = 0;
/* JF added rp>=ritem && I hope to god its right! */
if (rp >= ritem && ISVAR (*rp))
{
- /* Downcasting from item_number_t to symbol_number_t. */
+ /* Downcasting from item_number to symbol_number. */
edge[nedges++] = map_goto (states1[--length],
item_number_as_symbol_number (*rp));
- if (nullable[*rp])
+ if (nullable[*rp - ntokens])
done = 0;
}
}
if (nedges)
{
int j;
- includes[i] = XCALLOC (goto_number_t, nedges + 1);
+ CALLOC (includes[i], nedges + 1);
for (j = 0; j < nedges; j++)
includes[i][j] = edge[j];
includes[i][nedges] = -1;
compute_lookaheads (void)
{
size_t i;
- goto_list_t *sp;
+ goto_list *sp;
for (i = 0; i < nLA; i++)
for (sp = lookback[i]; sp; sp = sp->next)
/* Free LOOKBACK. */
for (i = 0; i < nLA; i++)
- LIST_FREE (goto_list_t, lookback[i]);
+ LIST_FREE (goto_list, lookback[i]);
XFREE (lookback);
bitsetv_free (F);
}
-/*---------------------------------------------------------------.
-| Count the number of lookaheads required for STATE (NLOOKAHEADS |
-| member). |
-`---------------------------------------------------------------*/
+/*-----------------------------------------------------------.
+| Count the number of lookaheads required for S (NLOOKAHEADS |
+| member). |
+`-----------------------------------------------------------*/
static int
-state_lookaheads_count (state_t *state)
+state_lookaheads_count (state *s)
{
int k;
int nlookaheads = 0;
- reductions_t *rp = state->reductions;
- transitions_t *sp = state->transitions;
+ reductions *rp = s->reductions;
+ transitions *sp = s->transitions;
/* We need a lookahead either to distinguish different
reductions (i.e., there are two or more), or to distinguish a
!TRANSITION_IS_DISABLED (sp, 0) && TRANSITION_IS_SHIFT (sp, 0)))
nlookaheads += rp->num;
else
- state->consistent = 1;
+ s->consistent = 1;
for (k = 0; k < sp->num; k++)
if (!TRANSITION_IS_DISABLED (sp, k) && TRANSITION_IS_ERROR (sp, k))
{
- state->consistent = 0;
+ s->consistent = 0;
break;
}
static void
initialize_LA (void)
{
- state_number_t i;
+ state_number i;
bitsetv pLA;
/* Compute the total number of reductions requiring a lookahead. */
nLA = 1;
pLA = LA = bitsetv_create (nLA, ntokens, BITSET_FIXED);
- lookback = XCALLOC (goto_list_t *, nLA);
+ CALLOC (lookback, nLA);
/* Initialize the members LOOKAHEADS for each state which reductions
require lookaheads. */
static void
lookaheads_print (FILE *out)
{
- state_number_t i;
+ state_number i;
int j, k;
- fprintf (out, _("Lookaheads: BEGIN\n"));
+ fprintf (out, "Lookaheads: BEGIN\n");
for (i = 0; i < nstates; ++i)
{
- reductions_t *reds = states[i]->reductions;
+ reductions *reds = states[i]->reductions;
bitset_iterator iter;
int nlookaheads = 0;
if (reds->lookaheads[k])
++nlookaheads;
- fprintf (out, _("State %d: %d lookaheads\n"),
+ fprintf (out, "State %d: %d lookaheads\n",
i, nlookaheads);
if (reds->lookaheads)
for (j = 0; j < reds->num; ++j)
BITSET_FOR_EACH (iter, reds->lookaheads[j], k, 0)
{
- fprintf (out, _(" on %d (%s) -> rule %d\n"),
+ fprintf (out, " on %d (%s) -> rule %d\n",
k, symbols[k]->tag,
reds->rules[j]->number);
};
}
- fprintf (out, _("Lookaheads: END\n"));
+ fprintf (out, "Lookaheads: END\n");
}
void
void
lalr_free (void)
{
- state_number_t s;
+ state_number s;
for (s = 0; s < nstates; ++s)
states[s]->reductions->lookaheads = NULL;
bitsetv_free (LA);
projects / bison.git / blobdiff