#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 "types.h"
#include "LR0.h"
#include "complain.h"
#include "lalr.h"
#include "derives.h"
#include "getargs.h"
-rule_t **LArule = NULL;
-bitsetv LA = NULL;
-size_t nLA;
-
-static int ngotos;
-short *goto_map = NULL;
+goto_number_t *goto_map = NULL;
+static goto_number_t ngotos = 0;
state_number_t *from_state = NULL;
state_number_t *to_state = NULL;
-/* And for the famous F variable, which name is so descriptive that a
- comment is hardly needed. <grin>. */
-static bitsetv F = NULL;
-
-static short **includes;
-static shorts **lookback;
-
-
-/*---------------------------------------------------------------.
-| digraph & traverse. |
-| |
-| The following variables are used as common storage between the |
-| two. |
-`---------------------------------------------------------------*/
-
-static short **R;
-static short *INDEX;
-static short *VERTICES;
-static int top;
-static int infinity;
-
-static void
-traverse (int i)
+/* Linked list of goto numbers. */
+typedef struct goto_list_s
{
- int j;
- int height;
-
- VERTICES[++top] = i;
- INDEX[i] = height = top;
-
- if (R[i])
- for (j = 0; R[i][j] >= 0; ++j)
- {
- if (INDEX[R[i][j]] == 0)
- traverse (R[i][j]);
+ struct goto_list_s *next;
+ goto_number_t value;
+} goto_list_t;
- if (INDEX[i] > INDEX[R[i][j]])
- INDEX[i] = INDEX[R[i][j]];
- bitset_or (F[i], F[i], F[R[i][j]]);
- }
-
- if (INDEX[i] == height)
- for (;;)
- {
- j = VERTICES[top--];
- INDEX[j] = infinity;
-
- if (i == j)
- break;
-
- bitset_copy (F[j], F[i]);
- }
-}
-
-
-static void
-digraph (short **relation)
-{
- int i;
+rule_t **LArule = NULL;
+bitsetv LA = NULL;
+size_t nLA;
- infinity = ngotos + 2;
- INDEX = XCALLOC (short, ngotos + 1);
- VERTICES = XCALLOC (short, ngotos + 1);
- top = 0;
- R = relation;
+/* And for the famous F variable, which name is so descriptive that a
+ comment is hardly needed. <grin>. */
+static bitsetv F = NULL;
- for (i = 0; i < ngotos; i++)
- INDEX[i] = 0;
+static goto_number_t **includes;
+static goto_list_t **lookback;
- for (i = 0; i < ngotos; i++)
- if (INDEX[i] == 0 && R[i])
- traverse (i);
- XFREE (INDEX);
- XFREE (VERTICES);
-}
static void
LA = bitsetv_create (nLA, ntokens, BITSET_FIXED);
LArule = XCALLOC (rule_t *, nLA);
- lookback = XCALLOC (shorts *, nLA);
+ lookback = XCALLOC (goto_list_t *, nLA);
np = LArule;
for (i = 0; i < nstates; i++)
if (!states[i]->consistent)
- for (j = 0; j < states[i]->reductions->nreds; j++)
+ for (j = 0; j < states[i]->reductions->num; j++)
*np++ = &rules[states[i]->reductions->rules[j]];
}
set_goto_map (void)
{
state_number_t state;
- short *temp_map;
+ goto_number_t *temp_map;
- goto_map = XCALLOC (short, nvars + 1) - ntokens;
- temp_map = XCALLOC (short, nvars + 1) - ntokens;
+ goto_map = XCALLOC (goto_number_t, nvars + 1) - ntokens;
+ temp_map = XCALLOC (goto_number_t, nvars + 1) - ntokens;
ngotos = 0;
for (state = 0; state < nstates; ++state)
{
- shifts_t *sp = states[state]->shifts;
+ transitions_t *sp = states[state]->transitions;
int i;
- for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
+ for (i = sp->num - 1; i >= 0 && TRANSITION_IS_GOTO (sp, i); --i)
{
- if (ngotos == SHRT_MAX)
- fatal (_("too many gotos (max %d)"), SHRT_MAX);
+ if (ngotos == GOTO_NUMBER_MAX)
+ fatal (_("too many gotos (max %d)"), GOTO_NUMBER_MAX);
ngotos++;
- goto_map[SHIFT_SYMBOL (sp, i)]++;
+ goto_map[TRANSITION_SYMBOL (sp, i)]++;
}
}
for (state = 0; state < nstates; ++state)
{
- shifts_t *sp = states[state]->shifts;
+ transitions_t *sp = states[state]->transitions;
int i;
- for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
+ for (i = sp->num - 1; i >= 0 && TRANSITION_IS_GOTO (sp, i); --i)
{
- int k = temp_map[SHIFT_SYMBOL (sp, i)]++;
+ int k = temp_map[TRANSITION_SYMBOL (sp, i)]++;
from_state[k] = state;
- to_state[k] = sp->shifts[i];
+ to_state[k] = sp->states[i];
}
}
static void
initialize_F (void)
{
- short **reads = XCALLOC (short *, ngotos);
- short *edge = XCALLOC (short, ngotos + 1);
+ goto_number_t **reads = XCALLOC (goto_number_t *, ngotos);
+ goto_number_t *edge = XCALLOC (goto_number_t, ngotos + 1);
int nedges = 0;
int i;
for (i = 0; i < ngotos; i++)
{
state_number_t stateno = to_state[i];
- shifts_t *sp = states[stateno]->shifts;
+ transitions_t *sp = states[stateno]->transitions;
int j;
- for (j = 0; j < sp->nshifts && SHIFT_IS_SHIFT (sp, j); j++)
- bitset_set (F[i], SHIFT_SYMBOL (sp, j));
+ for (j = 0; j < sp->num && TRANSITION_IS_SHIFT (sp, j); j++)
+ bitset_set (F[i], TRANSITION_SYMBOL (sp, j));
- for (; j < sp->nshifts; j++)
+ for (; j < sp->num; j++)
{
- symbol_number_t symbol = SHIFT_SYMBOL (sp, j);
+ symbol_number_t symbol = TRANSITION_SYMBOL (sp, j);
if (nullable[symbol])
edge[nedges++] = map_goto (stateno, symbol);
}
if (nedges)
{
- reads[i] = XCALLOC (short, nedges + 1);
+ reads[i] = XCALLOC (goto_number_t, nedges + 1);
memcpy (reads[i], edge, nedges * sizeof (edge[0]));
reads[i][nedges] = -1;
nedges = 0;
}
}
- digraph (reads);
+ relation_digraph (reads, ngotos, &F);
for (i = 0; i < ngotos; i++)
XFREE (reads[i]);
add_lookback_edge (state_t *state, rule_number_t ruleno, int gotono)
{
int i;
- shorts *sp;
+ goto_list_t *sp;
for (i = 0; i < state->nlookaheads; ++i)
if (state->lookaheads_rule[i]->number == ruleno)
assert (state->lookaheads_rule[i]->number == ruleno);
- sp = XCALLOC (shorts, 1);
+ sp = XCALLOC (goto_list_t, 1);
sp->next = lookback[(state->lookaheads - LA) + i];
sp->value = gotono;
lookback[(state->lookaheads - LA) + i] = sp;
}
-static void
-matrix_print (FILE *out, short **matrix, int n)
-{
- int i, j;
-
- for (i = 0; i < n; ++i)
- {
- fprintf (out, "%3d: ", i);
- if (matrix[i])
- for (j = 0; matrix[i][j] != -1; ++j)
- fprintf (out, "%3d ", matrix[i][j]);
- fputc ('\n', out);
- }
- fputc ('\n', out);
-}
-
-/*-------------------------------------------------------------------.
-| Return the transpose of R_ARG, of size N. Destroy R_ARG, as it is |
-| replaced with the result. |
-| |
-| R_ARG[I] is NULL or a -1 terminated list of numbers. |
-| |
-| RESULT[NUM] is NULL or the -1 terminated list of the I such as NUM |
-| is in R_ARG[I]. |
-`-------------------------------------------------------------------*/
-
-static short **
-transpose (short **R_arg, int n)
-{
- /* The result. */
- short **new_R = XCALLOC (short *, n);
- /* END_R[I] -- next entry of NEW_R[I]. */
- short **end_R = XCALLOC (short *, n);
- /* NEDGES[I] -- total size of NEW_R[I]. */
- short *nedges = XCALLOC (short, n);
- int i, j;
-
- if (trace_flag)
- {
- fputs ("transpose: input\n", stderr);
- matrix_print (stderr, R_arg, n);
- }
-
- /* Count. */
- for (i = 0; i < n; i++)
- if (R_arg[i])
- for (j = 0; R_arg[i][j] >= 0; ++j)
- ++nedges[R_arg[i][j]];
-
- /* Allocate. */
- for (i = 0; i < n; i++)
- if (nedges[i] > 0)
- {
- short *sp = XCALLOC (short, nedges[i] + 1);
- sp[nedges[i]] = -1;
- new_R[i] = sp;
- end_R[i] = sp;
- }
-
- /* Store. */
- for (i = 0; i < n; i++)
- if (R_arg[i])
- for (j = 0; R_arg[i][j] >= 0; ++j)
- {
- *end_R[R_arg[i][j]] = i;
- ++end_R[R_arg[i][j]];
- }
-
- free (nedges);
- free (end_R);
-
- /* Free the input: it is replaced with the result. */
- for (i = 0; i < n; i++)
- XFREE (R_arg[i]);
- free (R_arg);
-
- if (trace_flag)
- {
- fputs ("transpose: output\n", stderr);
- matrix_print (stderr, new_R, n);
- }
-
- return new_R;
-}
-
static void
build_relations (void)
{
- short *edge = XCALLOC (short, ngotos + 1);
+ goto_number_t *edge = XCALLOC (goto_number_t, ngotos + 1);
state_number_t *states1 = XCALLOC (state_number_t, ritem_longest_rhs () + 1);
int i;
- includes = XCALLOC (short *, ngotos);
+ includes = XCALLOC (goto_number_t *, ngotos);
for (i = 0; i < ngotos; i++)
{
for (rp = rules[*rulep].rhs; *rp >= 0; rp++)
{
- state = shifts_to (state->shifts,
- item_number_as_symbol_number (*rp));
+ state = transitions_to (state->transitions,
+ item_number_as_symbol_number (*rp));
states1[length++] = state->number;
}
if (nedges)
{
int j;
- includes[i] = XCALLOC (short, nedges + 1);
+ includes[i] = XCALLOC (goto_number_t, nedges + 1);
for (j = 0; j < nedges; j++)
includes[i][j] = edge[j];
includes[i][nedges] = -1;
XFREE (edge);
XFREE (states1);
- includes = transpose (includes, ngotos);
+ relation_transpose (&includes, ngotos);
}
{
int i;
- digraph (includes);
+ relation_digraph (includes, ngotos, &F);
for (i = 0; i < ngotos; i++)
XFREE (includes[i]);
compute_lookaheads (void)
{
size_t i;
- shorts *sp;
+ goto_list_t *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 (shorts, lookback[i]);
+ LIST_FREE (goto_list_t, lookback[i]);
XFREE (lookback);
bitsetv_free (F);
int k;
int nlookaheads = 0;
reductions_t *rp = states[i]->reductions;
- shifts_t *sp = states[i]->shifts;
+ transitions_t *sp = states[i]->transitions;
/* We need a lookahead either to distinguish different
reductions (i.e., there are two or more), or to distinguish a
reduction from a shift. Otherwise, it is straightforward,
and the state is `consistent'. */
- if (rp->nreds > 1
- || (rp->nreds == 1 && sp->nshifts && SHIFT_IS_SHIFT (sp, 0)))
- nlookaheads += rp->nreds;
+ if (rp->num > 1
+ || (rp->num == 1 && sp->num && TRANSITION_IS_SHIFT (sp, 0)))
+ nlookaheads += rp->num;
else
states[i]->consistent = 1;
- for (k = 0; k < sp->nshifts; k++)
- if (SHIFT_IS_ERROR (sp, k))
+ for (k = 0; k < sp->num; k++)
+ if (TRANSITION_IS_ERROR (sp, k))
{
states[i]->consistent = 0;
break;
fprintf (out, "Lookaheads: BEGIN\n");
for (i = 0; i < nstates; ++i)
{
+ bitset_iterator iter;
+
fprintf (out, "State %d: %d lookaheads\n",
i, states[i]->nlookaheads);
for (j = 0; j < states[i]->nlookaheads; ++j)
- for (k = 0; k < ntokens; ++k)
- if (bitset_test (states[i]->lookaheads[j], k))
- fprintf (out, " on %d (%s) -> rule %d\n",
- k, symbol_tag_get (symbols[k]),
- states[i]->lookaheads_rule[j]->number - 1);
+ BITSET_FOR_EACH (iter, states[i]->lookaheads[j], k, 0)
+ {
+ fprintf (out, " on %d (%s) -> rule %d\n",
+ k, symbols[k]->tag,
+ states[i]->lookaheads_rule[j]->number - 1);
+ };
}
fprintf (out, "Lookaheads: END\n");
}
projects / bison.git / blobdiff