/* Print information on generated parser, for bison,
- Copyright 1984, 1986, 1989, 2000, 2001 Free Software Foundation, Inc.
+
+ Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003
+ Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "system.h"
-#include "files.h"
-#include "gram.h"
+
+#include <bitset.h>
+#include <quotearg.h>
+
#include "LR0.h"
-#include "lalr.h"
+#include "closure.h"
#include "conflicts.h"
+#include "files.h"
#include "getargs.h"
-#include "state.h"
-#include "reader.h"
+#include "gram.h"
+#include "lalr.h"
#include "print.h"
+#include "reader.h"
#include "reduce.h"
-#include "closure.h"
+#include "state.h"
+#include "symtab.h"
+
+static bitset shiftset;
+static bitset lookaheadset;
#if 0
static void
#endif
\f
+
+/*---------------------------------------.
+| *WIDTH := max (*WIDTH, strlen (STR)). |
+`---------------------------------------*/
+
+static void
+max_length (size_t *width, const char *str)
+{
+ size_t len = strlen (str);
+ if (len > *width)
+ *width = len;
+}
+
/*--------------------------------.
| Report information on a state. |
`--------------------------------*/
static void
-print_core (FILE *out, int state)
+print_core (FILE *out, state *s)
{
int i;
- short *sitems = state_table[state].state->items;
- int snitems = state_table[state].state->nitems;
+ item_number *sitems = s->items;
+ int snritems = s->nitems;
+ symbol *previous_lhs = NULL;
- /* New experimental feature: if TRACE_FLAGS output all the items of
- a state, not only its kernel. */
- if (trace_flag)
+ /* Output all the items of a state, not only its kernel. */
+ if (report_flag & report_itemsets)
{
- closure (sitems, snitems);
+ closure (sitems, snritems);
sitems = itemset;
- snitems = nitemset;
+ snritems = nritemset;
}
- if (snitems)
- {
- for (i = 0; i < snitems; i++)
- {
- short *sp;
- short *sp1;
- int rule;
+ if (!snritems)
+ return;
- sp1 = sp = ritem + sitems[i];
+ fputc ('\n', out);
- while (*sp > 0)
- sp++;
+ for (i = 0; i < snritems; i++)
+ {
+ item_number *sp;
+ item_number *sp1;
+ rule_number r;
- rule = -(*sp);
- fprintf (out, " %s -> ", tags[rule_table[rule].lhs]);
+ sp1 = sp = ritem + sitems[i];
- for (sp = ritem + rule_table[rule].rhs; sp < sp1; sp++)
- fprintf (out, "%s ", tags[*sp]);
+ while (*sp >= 0)
+ sp++;
- fputc ('.', out);
+ r = item_number_as_rule_number (*sp);
- for (/* Nothing */; *sp > 0; ++sp)
- fprintf (out, " %s", tags[*sp]);
+ rule_lhs_print (&rules[r], previous_lhs, out);
+ previous_lhs = rules[r].lhs;
- fprintf (out, _(" (rule %d)"), rule);
- fputc ('\n', out);
- }
+ for (sp = rules[r].rhs; sp < sp1; sp++)
+ fprintf (out, " %s", symbols[*sp]->tag);
+ fputs (" .", out);
+ for (/* Nothing */; *sp >= 0; ++sp)
+ fprintf (out, " %s", symbols[*sp]->tag);
+
+ /* Display the lookaheads? */
+ if (report_flag & report_lookaheads)
+ state_rule_lookaheads_print (s, &rules[r], out);
fputc ('\n', out);
}
}
+
+/*------------------------------------------------------------.
+| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of S on |
+| OUT. |
+`------------------------------------------------------------*/
+
static void
-print_actions (FILE *out, int state)
+print_transitions (state *s, FILE *out, bool display_transitions_p)
{
+ transitions *trans = s->transitions;
+ size_t width = 0;
int i;
- shifts *shiftp = state_table[state].shift_table;
- reductions *redp = state_table[state].reduction_table;
- errs *errp = err_table[state];
+ /* Compute the width of the lookaheads column. */
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
+ {
+ symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+ max_length (&width, sym->tag);
+ }
+
+ /* Nothing to report. */
+ if (!width)
+ return;
- if (!shiftp->nshifts && !redp)
- {
- if (final_state == state)
- fprintf (out, _(" $default\taccept\n"));
- else
- fprintf (out, _(" NO ACTIONS\n"));
- return;
- }
+ fputc ('\n', out);
+ width += 2;
- for (i = 0; i < shiftp->nshifts; i++)
- if (!SHIFT_IS_DISABLED (shiftp, i))
+ /* Report lookaheads and shifts. */
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
{
- int state1 = shiftp->shifts[i];
- int symbol = state_table[state1].accessing_symbol;
- /* The following line used to be turned off. */
- if (ISVAR (symbol))
- break;
- if (symbol == 0) /* I.e. strcmp(tags[symbol],"$")==0 */
- fprintf (out,
- _(" $ \tgo to state %d\n"), state1);
+ symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+ const char *tag = sym->tag;
+ state *s1 = trans->states[i];
+ int j;
+
+ fprintf (out, " %s", tag);
+ for (j = width - strlen (tag); j > 0; --j)
+ fputc (' ', out);
+ if (display_transitions_p)
+ fprintf (out, _("shift, and go to state %d\n"), s1->number);
else
- fprintf (out,
- _(" %-4s\tshift, and go to state %d\n"),
- tags[symbol], state1);
+ fprintf (out, _("go to state %d\n"), s1->number);
}
+}
+
+
+/*--------------------------------------------------------.
+| Report the explicit errors of S raised from %nonassoc. |
+`--------------------------------------------------------*/
+
+static void
+print_errs (FILE *out, state *s)
+{
+ errs *errp = s->errs;
+ size_t width = 0;
+ int i;
+
+ /* Compute the width of the lookaheads column. */
+ for (i = 0; i < errp->num; ++i)
+ if (errp->symbols[i])
+ max_length (&width, errp->symbols[i]->tag);
+
+ /* Nothing to report. */
+ if (!width)
+ return;
- if (i > 0)
- fputc ('\n', out);
+ fputc ('\n', out);
+ width += 2;
+
+ /* Report lookaheads and errors. */
+ for (i = 0; i < errp->num; ++i)
+ if (errp->symbols[i])
+ {
+ const char *tag = errp->symbols[i]->tag;
+ int j;
+ fprintf (out, " %s", tag);
+ for (j = width - strlen (tag); j > 0; --j)
+ fputc (' ', out);
+ fputs (_("error (nonassociative)\n"), out);
+ }
+}
- if (errp)
+
+/*-------------------------------------------------------------.
+| Return the default rule of S if it has one, NULL otherwise. |
+`-------------------------------------------------------------*/
+
+static rule *
+state_default_rule (state *s)
+{
+ reductions *reds = s->reductions;
+ rule *default_rule = NULL;
+ int cmax = 0;
+ int i;
+
+ /* No need for a lookahead. */
+ if (s->consistent)
+ return reds->rules[0];
+
+ /* 1. Each reduction is possibly masked by the lookaheads on which
+ we shift (S/R conflicts)... */
+ bitset_zero (shiftset);
+ {
+ transitions *trans = s->transitions;
+ FOR_EACH_SHIFT (trans, i)
+ {
+ /* If this state has a shift for the error token, don't use a
+ default rule. */
+ if (TRANSITION_IS_ERROR (trans, i))
+ return NULL;
+ bitset_set (shiftset, TRANSITION_SYMBOL (trans, i));
+ }
+ }
+
+ /* 2. Each reduction is possibly masked by the lookaheads on which
+ we raise an error (due to %nonassoc). */
+ {
+ errs *errp = s->errs;
+ for (i = 0; i < errp->num; i++)
+ if (errp->symbols[i])
+ bitset_set (shiftset, errp->symbols[i]->number);
+ }
+
+ for (i = 0; i < reds->num; ++i)
{
- int j;
- for (j = 0; j < errp->nerrs; j++)
+ int count = 0;
+
+ /* How many non-masked lookaheads are there for this reduction?
+ */
+ bitset_andn (lookaheadset, reds->lookaheads[i], shiftset);
+ count = bitset_count (lookaheadset);
+
+ if (count > cmax)
{
- int symbol = errp->errs[j];
- if (!symbol)
- continue;
- fprintf (out, _(" %-4s\terror (nonassociative)\n"),
- tags[symbol]);
+ cmax = count;
+ default_rule = reds->rules[i];
}
- if (j > 0)
- fputc ('\n', out);
+ /* 3. And finally, each reduction is possibly masked by previous
+ reductions (in R/R conflicts, we keep the first reductions).
+ */
+ bitset_or (shiftset, shiftset, reds->lookaheads[i]);
}
- if (state_table[state].consistent && redp)
- {
- int rule = redp->rules[0];
- int symbol = rule_table[rule].lhs;
- fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- rule, tags[symbol]);
- }
- else if (redp)
- {
- print_reductions (out, state);
- }
+ return default_rule;
+}
- if (i < shiftp->nshifts)
- {
- for (; i < shiftp->nshifts; i++)
- if (!SHIFT_IS_DISABLED (shiftp, i))
- {
- int state1 = shiftp->shifts[i];
- int symbol = state_table[state1].accessing_symbol;
- fprintf (out, _(" %-4s\tgo to state %d\n"),
- tags[symbol], state1);
- }
- fputc ('\n', out);
- }
+/*--------------------------------------------------------------------.
+| Report a reduction of RULE on LOOKAHEADS (which can be `default'). |
+| If not ENABLED, the rule is masked by a shift or a reduce (S/R and |
+| R/R conflicts). |
+`--------------------------------------------------------------------*/
+
+static void
+print_reduction (FILE *out, size_t width,
+ const char *lookahead,
+ rule *r, bool enabled)
+{
+ int j;
+ fprintf (out, " %s", lookahead);
+ for (j = width - strlen (lookahead); j > 0; --j)
+ fputc (' ', out);
+ if (!enabled)
+ fputc ('[', out);
+ if (r->number)
+ fprintf (out, _("reduce using rule %d (%s)"), r->number, r->lhs->tag);
+ else
+ fprintf (out, _("accept"));
+ if (!enabled)
+ fputc (']', out);
+ fputc ('\n', out);
}
+
+/*-------------------------------------------.
+| Report on OUT the reduction actions of S. |
+`-------------------------------------------*/
+
static void
-print_state (FILE *out, int state)
+print_reductions (FILE *out, state *s)
+{
+ transitions *trans = s->transitions;
+ reductions *reds = s->reductions;
+ rule *default_rule = NULL;
+ size_t width = 0;
+ int i, j;
+
+ if (reds->num == 0)
+ return;
+
+ default_rule = state_default_rule (s);
+
+ bitset_zero (shiftset);
+ FOR_EACH_SHIFT (trans, i)
+ bitset_set (shiftset, TRANSITION_SYMBOL (trans, i));
+
+ /* Compute the width of the lookaheads column. */
+ if (default_rule)
+ width = strlen (_("$default"));
+
+ if (reds->lookaheads)
+ for (i = 0; i < ntokens; i++)
+ {
+ int count = bitset_test (shiftset, i);
+
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookaheads[j], i))
+ {
+ if (count == 0)
+ {
+ if (reds->rules[j] != default_rule)
+ max_length (&width, symbols[i]->tag);
+ count++;
+ }
+ else
+ {
+ max_length (&width, symbols[i]->tag);
+ }
+ }
+ }
+
+ /* Nothing to report. */
+ if (!width)
+ return;
+
+ fputc ('\n', out);
+ width += 2;
+
+ /* Report lookaheads (or $default) and reductions. */
+ if (reds->lookaheads)
+ for (i = 0; i < ntokens; i++)
+ {
+ int defaulted = 0;
+ int count = bitset_test (shiftset, i);
+
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookaheads[j], i))
+ {
+ if (count == 0)
+ {
+ if (reds->rules[j] != default_rule)
+ print_reduction (out, width,
+ symbols[i]->tag,
+ reds->rules[j], true);
+ else
+ defaulted = 1;
+ count++;
+ }
+ else
+ {
+ if (defaulted)
+ print_reduction (out, width,
+ symbols[i]->tag,
+ default_rule, true);
+ defaulted = 0;
+ print_reduction (out, width,
+ symbols[i]->tag,
+ reds->rules[j], false);
+ }
+ }
+ }
+
+ if (default_rule)
+ print_reduction (out, width,
+ _("$default"), default_rule, true);
+}
+
+
+/*--------------------------------------------------------------.
+| Report on OUT all the actions (shifts, gotos, reductions, and |
+| explicit erros from %nonassoc) of S. |
+`--------------------------------------------------------------*/
+
+static void
+print_actions (FILE *out, state *s)
+{
+ /* Print shifts. */
+ print_transitions (s, out, true);
+ print_errs (out, s);
+ print_reductions (out, s);
+ /* Print gotos. */
+ print_transitions (s, out, false);
+}
+
+
+/*----------------------------------.
+| Report all the data on S on OUT. |
+`----------------------------------*/
+
+static void
+print_state (FILE *out, state *s)
{
- fprintf (out, _("state %d"), state);
- fputs ("\n\n", out);
- print_core (out, state);
- print_actions (out, state);
fputs ("\n\n", out);
+ fprintf (out, _("state %d"), s->number);
+ fputc ('\n', out);
+ print_core (out, s);
+ print_actions (out, s);
+ if ((report_flag & report_solved_conflicts) && s->solved_conflicts)
+ {
+ fputc ('\n', out);
+ fputs (s->solved_conflicts, out);
+ }
}
\f
/*-----------------------------------------.
static void
print_grammar (FILE *out)
{
- int i, j;
- short *rule;
+ symbol_number i;
char buffer[90];
int column = 0;
- /* rule # : LHS -> RHS */
- fprintf (out, "%s\n\n", _("Grammar"));
- fprintf (out, " %s\n", _("Number, Line, Rule"));
- for (i = 1; i <= nrules; i++)
- /* Don't print rules disabled in reduce_grammar_tables. */
- if (rule_table[i].useful)
- {
- fprintf (out, _(" %3d %3d %s ->"),
- i, rule_table[i].line, tags[rule_table[i].lhs]);
- rule = &ritem[rule_table[i].rhs];
- if (*rule > 0)
- while (*rule > 0)
- fprintf (out, " %s", tags[*rule++]);
- else
- fprintf (out, " /* %s */", _("empty"));
- fputc ('\n', out);
- }
- fputs ("\n\n", out);
-
+ grammar_rules_print (out);
/* TERMINAL (type #) : rule #s terminal is on RHS */
fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
- fprintf (out, "%s (-1)\n", tags[0]);
-
- for (i = 0; i <= max_user_token_number; i++)
- if (token_translations[i] != 2)
+ for (i = 0; i < max_user_token_number + 1; i++)
+ if (token_translations[i] != undeftoken->number)
{
+ const char *tag = symbols[token_translations[i]]->tag;
+ rule_number r;
+ item_number *rhsp;
+
buffer[0] = 0;
- column = strlen (tags[token_translations[i]]);
- fputs (tags[token_translations[i]], out);
+ column = strlen (tag);
+ fputs (tag, out);
END_TEST (50);
sprintf (buffer, " (%d)", i);
- for (j = 1; j <= nrules; j++)
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
- if (*rule == token_translations[i])
+ for (r = 0; r < nrules; r++)
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == token_translations[i])
{
END_TEST (65);
- sprintf (buffer + strlen (buffer), " %d", j);
+ sprintf (buffer + strlen (buffer), " %d", r);
break;
}
fprintf (out, "%s\n", buffer);
fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
- for (i = ntokens; i <= nsyms - 1; i++)
+ for (i = ntokens; i < nsyms; i++)
{
int left_count = 0, right_count = 0;
+ rule_number r;
+ const char *tag = symbols[i]->tag;
- for (j = 1; j <= nrules; j++)
+ for (r = 0; r < nrules; r++)
{
- if (rule_table[j].lhs == i)
+ item_number *rhsp;
+ if (rules[r].lhs->number == i)
left_count++;
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
- if (*rule == i)
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == i)
{
right_count++;
break;
}
buffer[0] = 0;
- fputs (tags[i], out);
- column = strlen (tags[i]);
+ fputs (tag, out);
+ column = strlen (tag);
sprintf (buffer, " (%d)", i);
END_TEST (0);
END_TEST (50);
sprintf (buffer + strlen (buffer), _(" on left:"));
- for (j = 1; j <= nrules; j++)
+ for (r = 0; r < nrules; r++)
{
END_TEST (65);
- if (rule_table[j].lhs == i)
- sprintf (buffer + strlen (buffer), " %d", j);
+ if (rules[r].lhs->number == i)
+ sprintf (buffer + strlen (buffer), " %d", r);
}
}
sprintf (buffer + strlen (buffer), ",");
END_TEST (50);
sprintf (buffer + strlen (buffer), _(" on right:"));
- for (j = 1; j <= nrules; j++)
+ for (r = 0; r < nrules; r++)
{
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
- if (*rule == i)
+ item_number *rhsp;
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == i)
{
END_TEST (65);
- sprintf (buffer + strlen (buffer), " %d", j);
+ sprintf (buffer + strlen (buffer), " %d", r);
break;
}
}
}
fprintf (out, "%s\n", buffer);
}
- fputs ("\n\n", out);
}
\f
void
print_results (void)
{
- if (verbose_flag)
- {
- int i;
-
- /* We used to use just .out if spec_name_prefix (-p) was used, but
- that conflicts with Posix. */
- FILE *out = xfopen (spec_verbose_file, "w");
-
- size_t size = obstack_object_size (&output_obstack);
- fwrite (obstack_finish (&output_obstack), 1, size, out);
- if (size)
- fputs ("\n\n", out);
-
- reduce_output (out);
- conflicts_output (out);
-
- print_grammar (out);
-
- /* New experimental feature: output all the items of a state,
- not only its kernel. Requires to run closure, which need
- memory allocation/deallocation. */
- if (trace_flag)
- new_closure (nitems);
- for (i = 0; i < nstates; i++)
- print_state (out, i);
- if (trace_flag)
- free_closure ();
-
- xfclose (out);
- }
- obstack_free (&output_obstack, NULL);
+ state_number i;
+
+ /* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but
+ that conflicts with Posix. */
+ FILE *out = xfopen (spec_verbose_file, "w");
+
+ reduce_output (out);
+ grammar_rules_partial_print (out,
+ _("Rules never reduced"), rule_never_reduced_p);
+ conflicts_output (out);
+
+ print_grammar (out);
+
+ /* If the whole state item sets, not only the kernels, are wanted,
+ `closure' will be run, which needs memory allocation/deallocation. */
+ if (report_flag & report_itemsets)
+ new_closure (nritems);
+ /* Storage for print_reductions. */
+ shiftset = bitset_create (ntokens, BITSET_FIXED);
+ lookaheadset = bitset_create (ntokens, BITSET_FIXED);
+ for (i = 0; i < nstates; i++)
+ print_state (out, states[i]);
+ bitset_free (shiftset);
+ bitset_free (lookaheadset);
+ if (report_flag & report_itemsets)
+ free_closure ();
+
+ xfclose (out);
}
projects / bison.git / blobdiff