/* Compute look-ahead criteria for bison,
- Copyright 1984, 1986, 1989, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
+ Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
tokens they accept. */
#include "system.h"
+#include "bitset.h"
+#include "bitsetv.h"
+#include "quotearg.h"
+#include "symtab.h"
+#include "gram.h"
#include "reader.h"
#include "types.h"
#include "LR0.h"
-#include "symtab.h"
-#include "gram.h"
#include "complain.h"
#include "lalr.h"
#include "nullable.h"
/* All the decorated states, indexed by the state number. */
state_t **states = NULL;
-int tokensetsize;
-short *LAruleno;
-unsigned *LA;
+rule_t **LArule = NULL;
+bitsetv LA = NULL;
size_t nLA;
static int ngotos;
-short *goto_map;
-short *from_state;
-short *to_state;
+short *goto_map = NULL;
+short *from_state = NULL;
+short *to_state = NULL;
/* And for the famous F variable, which name is so descriptive that a
comment is hardly needed. <grin>. */
-static unsigned *F = NULL;
-#define F(Rule) (F + (Rule) * tokensetsize)
+static bitsetv F = NULL;
static short **includes;
static shorts **lookback;
traverse (int i)
{
int j;
- size_t k;
int height;
- size_t size = F (i + 1) - F(i);
VERTICES[++top] = i;
INDEX[i] = height = top;
if (INDEX[i] > INDEX[R[i][j]])
INDEX[i] = INDEX[R[i][j]];
- for (k = 0; k < size; ++k)
- F (i)[k] |= F (R[i][j])[k];
+ bitset_or (F[i], F[i], F[R[i][j]]);
}
if (INDEX[i] == height)
if (i == j)
break;
- for (k = 0; k < size; ++k)
- F (j)[k] = F (i)[k];
+ bitset_copy (F[j], F[i]);
}
}
static void
initialize_LA (void)
{
- int i;
+ size_t i;
int j;
- short *np;
+ rule_t **np;
/* Avoid having to special case 0. */
if (!nLA)
nLA = 1;
- LA = XCALLOC (unsigned, nLA * tokensetsize);
- LAruleno = XCALLOC (short, nLA);
+ LA = bitsetv_create (nLA, ntokens, BITSET_FIXED);
+ LArule = XCALLOC (rule_t *, nLA);
lookback = XCALLOC (shorts *, nLA);
- np = LAruleno;
+ np = LArule;
for (i = 0; i < nstates; i++)
if (!states[i]->consistent)
for (j = 0; j < states[i]->reductions->nreds; j++)
- *np++ = states[i]->reductions->rules[j];
+ *np++ = &rules[states[i]->reductions->rules[j]];
}
static void
set_goto_map (void)
{
- int state, i;
+ size_t state;
+ int i;
short *temp_map;
goto_map = XCALLOC (short, nvars + 1) - ntokens;
shifts *sp = states[state]->shifts;
for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
{
- if (ngotos == MAXSHORT)
- fatal (_("too many gotos (max %d)"), MAXSHORT);
+ if (ngotos == SHRT_MAX)
+ fatal (_("too many gotos (max %d)"), SHRT_MAX);
ngotos++;
goto_map[SHIFT_SYMBOL (sp, i)]++;
`----------------------------------------------------------*/
static int
-map_goto (int state, int symbol)
+map_goto (int state, symbol_number_t symbol)
{
int high;
int low;
int i;
- F = XCALLOC (unsigned, ngotos * tokensetsize);
+ F = bitsetv_create (ngotos, ntokens, BITSET_FIXED);
for (i = 0; i < ngotos; i++)
{
int j;
for (j = 0; j < sp->nshifts && SHIFT_IS_SHIFT (sp, j); j++)
- SETBIT (F (i), SHIFT_SYMBOL (sp, j));
+ bitset_set (F[i], SHIFT_SYMBOL (sp, j));
for (; j < sp->nshifts; j++)
{
- int symbol = SHIFT_SYMBOL (sp, j);
+ symbol_number_t symbol = SHIFT_SYMBOL (sp, j);
if (nullable[symbol])
edge[nedges++] = map_goto (stateno, symbol);
}
if (nedges)
{
reads[i] = XCALLOC (short, nedges + 1);
- shortcpy (reads[i], edge, nedges);
+ memcpy (reads[i], edge, nedges * sizeof (edge[0]));
reads[i][nedges] = -1;
nedges = 0;
}
shorts *sp;
for (i = 0; i < state->nlookaheads; ++i)
- if (LAruleno[state->lookaheadsp + i] == ruleno)
+ if (state->lookaheads_rule[i]->number == ruleno)
break;
- assert (LAruleno[state->lookaheadsp + i] == ruleno);
+ assert (state->lookaheads_rule[i]->number == ruleno);
sp = XCALLOC (shorts, 1);
- sp->next = lookback[state->lookaheadsp + i];
+ sp->next = lookback[(state->lookaheads - LA) + i];
sp->value = gotono;
- lookback[state->lookaheadsp + i] = sp;
+ lookback[(state->lookaheads - LA) + i] = sp;
}
for (i = 0; i < ngotos; i++)
{
int nedges = 0;
- int symbol1 = states[to_state[i]]->accessing_symbol;
+ symbol_number_t symbol1 = states[to_state[i]]->accessing_symbol;
short *rulep;
for (rulep = derives[symbol1]; *rulep > 0; rulep++)
{
int done;
int length = 1;
- short *rp;
+ item_number_t *rp;
state_t *state = states[from_state[i]];
states1[0] = state->number;
- for (rp = &ritem[rules[*rulep].rhs]; *rp >= 0; rp++)
+ for (rp = rules[*rulep].rhs; *rp >= 0; rp++)
{
shifts *sp = state->shifts;
int j;
for (j = 0; j < sp->nshifts; j++)
{
state = states[sp->shifts[j]];
- if (state->accessing_symbol == *rp)
+ if (state->accessing_symbol
+ == item_number_as_symbol_number (*rp))
break;
}
/* JF added rp>=ritem && I hope to god its right! */
if (rp >= ritem && ISVAR (*rp))
{
- edge[nedges++] = map_goto (states1[--length], *rp);
+ /* Downcasting from item_number_t to symbol_number_t. */
+ edge[nedges++] = map_goto (states1[--length],
+ item_number_as_symbol_number (*rp));
if (nullable[*rp])
done = 0;
}
for (i = 0; i < nLA; i++)
for (sp = lookback[i]; sp; sp = sp->next)
- {
- int size = LA (i + 1) - LA (i);
- int j;
- for (j = 0; j < size; ++j)
- LA (i)[j] |= F (sp->value)[j];
- }
+ bitset_or (LA[i], LA[i], F[sp->value]);
/* Free LOOKBACK. */
for (i = 0; i < nLA; i++)
LIST_FREE (shorts, lookback[i]);
XFREE (lookback);
- XFREE (F);
+ bitsetv_free (F);
}
-/*--------------------------------------.
-| Initializing the lookaheads members. |
-`--------------------------------------*/
+/*-------------------------------------------------------------.
+| Count the number of lookaheads required for each state |
+| (NLOOKAHEADS member). Compute the total number of LA, NLA. |
+`-------------------------------------------------------------*/
static void
-initialize_lookaheads (void)
+states_lookaheads_count (void)
{
- int i;
+ size_t i;
nLA = 0;
+
+ /* Count */
for (i = 0; i < nstates; i++)
{
int k;
}
states[i]->nlookaheads = nlookaheads;
- states[i]->lookaheadsp = nLA;
nLA += nlookaheads;
}
}
+/*--------------------------------------.
+| Initializing the lookaheads members. |
+`--------------------------------------*/
+
+static void
+states_lookaheads_initialize (void)
+{
+ size_t i;
+ bitsetv pLA = LA;
+ rule_t **pLArule = LArule;
+
+ /* Initialize the members LOOKAHEADS and LOOKAHEADS_RULE for each
+ state. */
+ for (i = 0; i < nstates; i++)
+ {
+ states[i]->lookaheads = pLA;
+ states[i]->lookaheads_rule = pLArule;
+ pLA += states[i]->nlookaheads;
+ pLArule += states[i]->nlookaheads;
+ }
+}
+
+
/*---------------------------------------.
| Output the lookaheads for each state. |
`---------------------------------------*/
static void
lookaheads_print (FILE *out)
{
- int i, j, k;
+ size_t i;
+ int j, k;
fprintf (out, "Lookaheads: BEGIN\n");
for (i = 0; i < nstates; ++i)
{
for (j = 0; j < states[i]->nlookaheads; ++j)
for (k = 0; k < ntokens; ++k)
- if (BITISSET (LA (states[i]->lookaheadsp + j), j))
+ if (bitset_test (states[i]->lookaheads[j], k))
fprintf (out, " on %d (%s) -> rule %d\n",
- k, symbols[k]->tag,
- -LAruleno[states[i]->lookaheadsp + j] - 1);
+ k, symbol_tag_get (symbols[k]),
+ states[i]->lookaheads_rule[j]->number - 1);
}
fprintf (out, "Lookaheads: END\n");
}
void
lalr (void)
{
- tokensetsize = WORDSIZE (ntokens);
-
- initialize_lookaheads ();
+ states_lookaheads_count ();
initialize_LA ();
+ states_lookaheads_initialize ();
set_goto_map ();
initialize_F ();
build_relations ();
projects / bison.git / blobdiff