X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/9d774affbae6fe069f68ea20ec0401dda019e6b6..ccdc1577ef7fb32a5e30cb655337e7cd42b98987:/src/conflicts.c
diff --git a/src/conflicts.c b/src/conflicts.c
index ade54bd7..ccd50ebf 100644
--- a/src/conflicts.c
+++ b/src/conflicts.c
@@ -1,24 +1,22 @@
/* Find and resolve or report lookahead conflicts for bison,
- Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
- 2007 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1989, 1992, 2000-2012 Free Software Foundation,
+ Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison 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 2, or (at your option)
- any later version.
+ 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.
- Bison 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.
+ 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 Bison; see the file COPYING. If not, write to the Free
- Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see . */
#include
#include "system.h"
@@ -32,6 +30,7 @@
#include "getargs.h"
#include "gram.h"
#include "lalr.h"
+#include "print-xml.h"
#include "reader.h"
#include "state.h"
#include "symtab.h"
@@ -41,6 +40,7 @@ int expected_sr_conflicts = -1;
int expected_rr_conflicts = -1;
static char *conflicts;
static struct obstack solved_conflicts_obstack;
+static struct obstack solved_conflicts_xml_obstack;
static bitset shift_set;
static bitset lookahead_set;
@@ -64,74 +64,150 @@ enum conflict_resolution
static inline void
log_resolution (rule *r, symbol_number token,
- enum conflict_resolution resolution)
+ enum conflict_resolution resolution)
{
if (report_flag & report_solved_conflicts)
{
/* The description of the resolution. */
switch (resolution)
- {
- case shift_resolution:
- case right_resolution:
- obstack_fgrow2 (&solved_conflicts_obstack,
- _("\
- Conflict between rule %d and token %s resolved as shift"),
- r->number,
- symbols[token]->tag);
- break;
- case reduce_resolution:
- case left_resolution:
- obstack_fgrow2 (&solved_conflicts_obstack,
- _("\
- Conflict between rule %d and token %s resolved as reduce"),
- r->number,
- symbols[token]->tag);
- break;
- case nonassoc_resolution:
- obstack_fgrow2 (&solved_conflicts_obstack,
- _("\
- Conflict between rule %d and token %s resolved as an error"),
- r->number,
- symbols[token]->tag);
- break;
- }
+ {
+ case shift_resolution:
+ case right_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ _(" Conflict between rule %d and token %s"
+ " resolved as shift"),
+ r->number,
+ symbols[token]->tag);
+ break;
+
+ case reduce_resolution:
+ case left_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ _(" Conflict between rule %d and token %s"
+ " resolved as reduce"),
+ r->number,
+ symbols[token]->tag);
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ _(" Conflict between rule %d and token %s"
+ " resolved as an error"),
+ r->number,
+ symbols[token]->tag);
+ break;
+ }
/* The reason. */
switch (resolution)
- {
- case shift_resolution:
- obstack_fgrow2 (&solved_conflicts_obstack,
- " (%s < %s)",
- r->prec->tag,
- symbols[token]->tag);
- break;
-
- case reduce_resolution:
- obstack_fgrow2 (&solved_conflicts_obstack,
- " (%s < %s)",
- symbols[token]->tag,
- r->prec->tag);
- break;
-
- case left_resolution:
- obstack_fgrow1 (&solved_conflicts_obstack,
- " (%%left %s)",
- symbols[token]->tag);
- break;
-
- case right_resolution:
- obstack_fgrow1 (&solved_conflicts_obstack,
- " (%%right %s)",
- symbols[token]->tag);
- break;
- case nonassoc_resolution:
- obstack_fgrow1 (&solved_conflicts_obstack,
- " (%%nonassoc %s)",
- symbols[token]->tag);
- break;
- }
+ {
+ case shift_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ " (%s < %s)",
+ r->prec->tag,
+ symbols[token]->tag);
+ break;
+
+ case reduce_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ " (%s < %s)",
+ symbols[token]->tag,
+ r->prec->tag);
+ break;
+
+ case left_resolution:
+ obstack_fgrow1 (&solved_conflicts_obstack,
+ " (%%left %s)",
+ symbols[token]->tag);
+ break;
+
+ case right_resolution:
+ obstack_fgrow1 (&solved_conflicts_obstack,
+ " (%%right %s)",
+ symbols[token]->tag);
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow1 (&solved_conflicts_obstack,
+ " (%%nonassoc %s)",
+ symbols[token]->tag);
+ break;
+ }
+
obstack_sgrow (&solved_conflicts_obstack, ".\n");
}
+
+ /* XML report */
+ if (xml_flag)
+ {
+ /* The description of the resolution. */
+ switch (resolution)
+ {
+ case shift_resolution:
+ case right_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ " ",
+ r->number,
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case reduce_resolution:
+ case left_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ " ",
+ r->number,
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ " ",
+ r->number,
+ xml_escape (symbols[token]->tag));
+ break;
+ }
+
+ /* The reason. */
+ switch (resolution)
+ {
+ case shift_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ "%s < %s",
+ xml_escape_n (0, r->prec->tag),
+ xml_escape_n (1, symbols[token]->tag));
+ break;
+
+ case reduce_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ "%s < %s",
+ xml_escape_n (0, symbols[token]->tag),
+ xml_escape_n (1, r->prec->tag));
+ break;
+
+ case left_resolution:
+ obstack_fgrow1 (&solved_conflicts_xml_obstack,
+ "%%left %s",
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case right_resolution:
+ obstack_fgrow1 (&solved_conflicts_xml_obstack,
+ "%%right %s",
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow1 (&solved_conflicts_xml_obstack,
+ "%%nonassoc %s",
+ xml_escape (symbols[token]->tag));
+ break;
+ }
+
+ obstack_sgrow (&solved_conflicts_xml_obstack, "\n");
+ }
}
@@ -150,7 +226,7 @@ flush_shift (state *s, int token)
bitset_reset (lookahead_set, token);
for (i = 0; i < trans->num; i++)
if (!TRANSITION_IS_DISABLED (trans, i)
- && TRANSITION_SYMBOL (trans, i) == token)
+ && TRANSITION_SYMBOL (trans, i) == token)
TRANSITION_DISABLE (trans, i);
}
@@ -192,51 +268,56 @@ resolve_sr_conflict (state *s, int ruleno, symbol **errors, int *nerrs)
for (i = 0; i < ntokens; i++)
if (bitset_test (lookahead_tokens, i)
- && bitset_test (lookahead_set, i)
- && symbols[i]->prec)
+ && bitset_test (lookahead_set, i)
+ && symbols[i]->prec)
{
- /* Shift-reduce conflict occurs for token number i
- and it has a precedence.
- The precedence of shifting is that of token i. */
- if (symbols[i]->prec < redprec)
- {
- log_resolution (redrule, i, reduce_resolution);
- flush_shift (s, i);
- }
- else if (symbols[i]->prec > redprec)
- {
- log_resolution (redrule, i, shift_resolution);
- flush_reduce (lookahead_tokens, i);
- }
- else
- /* Matching precedence levels.
- For left association, keep only the reduction.
- For right association, keep only the shift.
- For nonassociation, keep neither. */
-
- switch (symbols[i]->assoc)
- {
- default:
- abort ();
-
- case right_assoc:
- log_resolution (redrule, i, right_resolution);
- flush_reduce (lookahead_tokens, i);
- break;
-
- case left_assoc:
- log_resolution (redrule, i, left_resolution);
- flush_shift (s, i);
- break;
-
- case non_assoc:
- log_resolution (redrule, i, nonassoc_resolution);
- flush_shift (s, i);
- flush_reduce (lookahead_tokens, i);
- /* Record an explicit error for this token. */
- errors[(*nerrs)++] = symbols[i];
- break;
- }
+ /* Shift-reduce conflict occurs for token number i
+ and it has a precedence.
+ The precedence of shifting is that of token i. */
+ if (symbols[i]->prec < redprec)
+ {
+ log_resolution (redrule, i, reduce_resolution);
+ flush_shift (s, i);
+ }
+ else if (symbols[i]->prec > redprec)
+ {
+ log_resolution (redrule, i, shift_resolution);
+ flush_reduce (lookahead_tokens, i);
+ }
+ else
+ /* Matching precedence levels.
+ For non-defined associativity, keep both: unexpected
+ associativity conflict.
+ For left associativity, keep only the reduction.
+ For right associativity, keep only the shift.
+ For nonassociativity, keep neither. */
+
+ switch (symbols[i]->assoc)
+ {
+ case undef_assoc:
+ abort ();
+
+ case precedence_assoc:
+ break;
+
+ case right_assoc:
+ log_resolution (redrule, i, right_resolution);
+ flush_reduce (lookahead_tokens, i);
+ break;
+
+ case left_assoc:
+ log_resolution (redrule, i, left_resolution);
+ flush_shift (s, i);
+ break;
+
+ case non_assoc:
+ log_resolution (redrule, i, nonassoc_resolution);
+ flush_shift (s, i);
+ flush_reduce (lookahead_tokens, i);
+ /* Record an explicit error for this token. */
+ errors[(*nerrs)++] = symbols[i];
+ break;
+ }
}
}
@@ -269,7 +350,7 @@ set_conflicts (state *s, symbol **errors)
precedence. */
for (i = 0; i < reds->num; ++i)
if (reds->rules[i]->prec && reds->rules[i]->prec->prec
- && !bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
+ && !bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
resolve_sr_conflict (s, i, errors, &nerrs);
if (nerrs)
@@ -283,13 +364,18 @@ set_conflicts (state *s, symbol **errors)
obstack_1grow (&solved_conflicts_obstack, '\0');
s->solved_conflicts = obstack_finish (&solved_conflicts_obstack);
}
+ if (obstack_object_size (&solved_conflicts_xml_obstack))
+ {
+ obstack_1grow (&solved_conflicts_xml_obstack, '\0');
+ s->solved_conflicts_xml = obstack_finish (&solved_conflicts_xml_obstack);
+ }
/* Loop over all rules which require lookahead in this state. Check
for conflicts not resolved above. */
for (i = 0; i < reds->num; ++i)
{
if (!bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
- conflicts[s->number] = 1;
+ conflicts[s->number] = 1;
bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]);
}
}
@@ -311,15 +397,16 @@ conflicts_solve (void)
shift_set = bitset_create (ntokens, BITSET_FIXED);
lookahead_set = bitset_create (ntokens, BITSET_FIXED);
obstack_init (&solved_conflicts_obstack);
+ obstack_init (&solved_conflicts_xml_obstack);
for (i = 0; i < nstates; i++)
{
set_conflicts (states[i], errors);
/* For uniformity of the code, make sure all the states have a valid
- `errs' member. */
+ `errs' member. */
if (!states[i]->errs)
- states[i]->errs = errs_new (0, 0);
+ states[i]->errs = errs_new (0, 0);
}
free (errors);
@@ -388,11 +475,11 @@ count_rr_conflicts (state *s, bool one_per_token)
int count = 0;
int j;
for (j = 0; j < reds->num; ++j)
- if (bitset_test (reds->lookahead_tokens[j], i))
- count++;
+ if (bitset_test (reds->lookahead_tokens[j], i))
+ count++;
if (count >= 2)
- rrc_count += one_per_token ? 1 : count-1;
+ rrc_count += one_per_token ? 1 : count-1;
}
return rrc_count;
@@ -408,7 +495,7 @@ conflict_report (FILE *out, int src_num, int rrc_num)
{
if (src_num && rrc_num)
fprintf (out, _("conflicts: %d shift/reduce, %d reduce/reduce\n"),
- src_num, rrc_num);
+ src_num, rrc_num);
else if (src_num)
fprintf (out, _("conflicts: %d shift/reduce\n"), src_num);
else if (rrc_num)
@@ -429,12 +516,12 @@ conflicts_output (FILE *out)
{
state *s = states[i];
if (conflicts[i])
- {
- fprintf (out, _("State %d "), i);
- conflict_report (out, count_sr_conflicts (s),
- count_rr_conflicts (s, true));
- printed_sth = true;
- }
+ {
+ fprintf (out, _("State %d "), i);
+ conflict_report (out, count_sr_conflicts (s),
+ count_rr_conflicts (s, true));
+ printed_sth = true;
+ }
}
if (printed_sth)
fputs ("\n\n", out);
@@ -444,7 +531,7 @@ conflicts_output (FILE *out)
| Total the number of S/R and R/R conflicts. Unlike the |
| code in conflicts_output, however, count EACH pair of |
| reductions for the same state and lookahead as one |
-| conflict. |
+| conflict. |
`--------------------------------------------------------*/
int
@@ -458,8 +545,8 @@ conflicts_total_count (void)
for (i = 0; i < nstates; i++)
if (conflicts[i])
{
- count += count_sr_conflicts (states[i]);
- count += count_rr_conflicts (states[i], false);
+ count += count_sr_conflicts (states[i]);
+ count += count_rr_conflicts (states[i], false);
}
return count;
}
@@ -489,15 +576,15 @@ conflicts_print (void)
for (i = 0; i < nstates; i++)
if (conflicts[i])
- {
- src_total += count_sr_conflicts (states[i]);
- rrc_total += count_rr_conflicts (states[i], true);
- }
+ {
+ src_total += count_sr_conflicts (states[i]);
+ rrc_total += count_rr_conflicts (states[i], true);
+ }
}
if (! glr_parser && rrc_total > 0 && expected_rr_conflicts != -1)
{
- warn (_("%%expect-rr applies only to GLR parsers"));
+ complain (Wother, _("%%expect-rr applies only to GLR parsers"));
expected_rr_conflicts = -1;
}
@@ -512,25 +599,34 @@ conflicts_print (void)
return;
/* Report the total number of conflicts on STDERR. */
+ if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1)
+ {
+ if (!(warnings_flag & Wconflicts_sr))
+ src_total = 0;
+ if (!(warnings_flag & Wconflicts_rr))
+ rrc_total = 0;
+ }
if (src_total | rrc_total)
{
+ if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1)
+ set_warning_issued ();
if (! yacc_flag)
- fprintf (stderr, "%s: ", current_file);
+ fprintf (stderr, "%s: ", current_file);
conflict_report (stderr, src_total, rrc_total);
}
if (expected_sr_conflicts != -1 || expected_rr_conflicts != -1)
{
if (! src_ok)
- complain (ngettext ("expected %d shift/reduce conflict",
- "expected %d shift/reduce conflicts",
- src_expected),
- src_expected);
+ complain (complaint, ngettext ("expected %d shift/reduce conflict",
+ "expected %d shift/reduce conflicts",
+ src_expected),
+ src_expected);
if (! rrc_ok)
- complain (ngettext ("expected %d reduce/reduce conflict",
- "expected %d reduce/reduce conflicts",
- rrc_expected),
- rrc_expected);
+ complain (complaint, ngettext ("expected %d reduce/reduce conflict",
+ "expected %d reduce/reduce conflicts",
+ rrc_expected),
+ rrc_expected);
}
}
@@ -542,4 +638,5 @@ conflicts_free (void)
bitset_free (shift_set);
bitset_free (lookahead_set);
obstack_free (&solved_conflicts_obstack, NULL);
+ obstack_free (&solved_conflicts_xml_obstack, NULL);
}