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bison/src/print.c
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Akim Demaille c932d6135c maint: run "make update-copyright".
2012-01-13 11:48:14 +01:00

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/* Print information on generated parser, for bison,
Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2012 Free
Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "system.h"
#include <bitset.h>
#include <quotearg.h>
#include "LR0.h"
#include "closure.h"
#include "conflicts.h"
#include "files.h"
#include "getargs.h"
#include "gram.h"
#include "lalr.h"
#include "muscle-tab.h"
#include "print.h"
#include "reader.h"
#include "reduce.h"
#include "state.h"
#include "symtab.h"
#include "tables.h"
static bitset no_reduce_set;
#if 0
static void
print_token (int extnum, int token)
{
fprintf (out, _(" type %d is %s\n"), extnum, tags[token]);
}
#endif
/*---------------------------------------.
| *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, state *s)
{
size_t i;
item_number *sitems = s->items;
size_t snritems = s->nitems;
symbol *previous_lhs = NULL;
/* Output all the items of a state, not only its kernel. */
if (report_flag & report_itemsets)
{
closure (sitems, snritems);
sitems = itemset;
snritems = nitemset;
}
if (!snritems)
return;
fputc ('\n', out);
for (i = 0; i < snritems; i++)
{
item_number *sp;
item_number *sp1;
rule_number r;
sp1 = sp = ritem + sitems[i];
while (*sp >= 0)
sp++;
r = item_number_as_rule_number (*sp);
rule_lhs_print (&rules[r], previous_lhs, out);
previous_lhs = rules[r].lhs;
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 lookahead tokens? */
if (report_flag & report_lookahead_tokens
&& item_number_is_rule_number (*sp1))
state_rule_lookahead_tokens_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_transitions (state *s, FILE *out, bool display_transitions_p)
{
transitions *trans = s->transitions;
size_t width = 0;
int i;
/* Compute the width of the lookahead token 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;
fputc ('\n', out);
width += 2;
/* Report lookahead tokens and shifts. */
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)];
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, _("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 lookahead token 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;
fputc ('\n', out);
width += 2;
/* Report lookahead tokens 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);
}
}
/*-------------------------------------------------------------------------.
| Report a reduction of RULE on LOOKAHEAD_TOKEN (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_token,
rule *r, bool enabled)
{
int j;
fprintf (out, " %s", lookahead_token);
for (j = width - strlen (lookahead_token); 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_reductions (FILE *out, state *s)
{
transitions *trans = s->transitions;
reductions *reds = s->reductions;
rule *default_reduction = NULL;
size_t width = 0;
int i, j;
bool default_reduction_only = true;
if (reds->num == 0)
return;
if (yydefact[s->number] != 0)
default_reduction = &rules[yydefact[s->number] - 1];
bitset_zero (no_reduce_set);
FOR_EACH_SHIFT (trans, i)
bitset_set (no_reduce_set, TRANSITION_SYMBOL (trans, i));
for (i = 0; i < s->errs->num; ++i)
if (s->errs->symbols[i])
bitset_set (no_reduce_set, s->errs->symbols[i]->number);
/* Compute the width of the lookahead token column. */
if (default_reduction)
width = strlen (_("$default"));
if (reds->lookahead_tokens)
for (i = 0; i < ntokens; i++)
{
bool count = bitset_test (no_reduce_set, i);
for (j = 0; j < reds->num; ++j)
if (bitset_test (reds->lookahead_tokens[j], i))
{
if (! count)
{
if (reds->rules[j] != default_reduction)
max_length (&width, symbols[i]->tag);
count = true;
}
else
{
max_length (&width, symbols[i]->tag);
}
}
}
/* Nothing to report. */
if (!width)
return;
fputc ('\n', out);
width += 2;
/* Report lookahead tokens (or $default) and reductions. */
if (reds->lookahead_tokens)
for (i = 0; i < ntokens; i++)
{
bool defaulted = false;
bool count = bitset_test (no_reduce_set, i);
if (count)
default_reduction_only = false;
for (j = 0; j < reds->num; ++j)
if (bitset_test (reds->lookahead_tokens[j], i))
{
if (! count)
{
if (reds->rules[j] != default_reduction)
{
default_reduction_only = false;
print_reduction (out, width,
symbols[i]->tag,
reds->rules[j], true);
}
else
defaulted = true;
count = true;
}
else
{
default_reduction_only = false;
if (defaulted)
print_reduction (out, width,
symbols[i]->tag,
default_reduction, true);
defaulted = false;
print_reduction (out, width,
symbols[i]->tag,
reds->rules[j], false);
}
}
}
if (default_reduction)
{
char *default_reductions =
muscle_percent_define_get ("lr.default-reductions");
print_reduction (out, width, _("$default"), default_reduction, true);
aver (0 == strcmp (default_reductions, "most")
|| (0 == strcmp (default_reductions, "consistent")
&& default_reduction_only)
|| (reds->num == 1 && reds->rules[0]->number == 0));
free (default_reductions);
}
}
/*--------------------------------------------------------------.
| 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)
{
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);
}
}
/*-----------------------------------------.
| Print information on the whole grammar. |
`-----------------------------------------*/
#define END_TEST(End) \
do { \
if (column + strlen(buffer) > (End)) \
{ \
fprintf (out, "%s\n ", buffer); \
column = 3; \
buffer[0] = 0; \
} \
} while (0)
static void
print_grammar (FILE *out)
{
symbol_number i;
char buffer[90];
int column = 0;
grammar_rules_print (out);
/* TERMINAL (type #) : rule #s terminal is on RHS */
fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
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 (tag);
fputs (tag, out);
END_TEST (65);
sprintf (buffer, " (%d)", 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", r);
break;
}
fprintf (out, "%s\n", buffer);
}
fputs ("\n\n", out);
fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
for (i = ntokens; i < nsyms; i++)
{
int left_count = 0, right_count = 0;
rule_number r;
const char *tag = symbols[i]->tag;
for (r = 0; r < nrules; r++)
{
item_number *rhsp;
if (rules[r].lhs->number == i)
left_count++;
for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
if (item_number_as_symbol_number (*rhsp) == i)
{
right_count++;
break;
}
}
buffer[0] = 0;
fputs (tag, out);
column = strlen (tag);
sprintf (buffer, " (%d)", i);
END_TEST (0);
if (left_count > 0)
{
END_TEST (65);
sprintf (buffer + strlen (buffer), _(" on left:"));
for (r = 0; r < nrules; r++)
{
if (rules[r].lhs->number == i)
{
END_TEST (65);
sprintf (buffer + strlen (buffer), " %d", r);
}
}
}
if (right_count > 0)
{
if (left_count > 0)
sprintf (buffer + strlen (buffer), ",");
END_TEST (65);
sprintf (buffer + strlen (buffer), _(" on right:"));
for (r = 0; r < nrules; r++)
{
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", r);
break;
}
}
}
fprintf (out, "%s\n", buffer);
}
}
void
print_results (void)
{
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 useless in parser due to conflicts"),
rule_useless_in_parser_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. */
no_reduce_set = bitset_create (ntokens, BITSET_FIXED);
for (i = 0; i < nstates; i++)
print_state (out, states[i]);
bitset_free (no_reduce_set);
if (report_flag & report_itemsets)
free_closure ();
xfclose (out);
}
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