/* Allocate input grammar variables for bison,
- Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1986, 1989, 2001, 2002 Free Software Foundation, Inc.
-This file is part of Bison, the GNU Compiler Compiler.
+ 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.
+ 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.
-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.
+ 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.
-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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-/* comments for these variables are in gram.h */
+#include "system.h"
-int nitems;
-int nrules;
-int nsyms;
-int ntokens;
-int nvars;
+#include <quotearg.h>
-short *ritem;
-short *rlhs;
-short *rrhs;
-short *rprec;
-short *rprecsym;
-short *sprec;
-short *rassoc;
-short *sassoc;
-short *token_translations;
-short *rline;
+#include "gram.h"
+#include "reader.h"
+#include "reduce.h"
+#include "symtab.h"
-int start_symbol;
+/* Comments for these variables are in gram.h. */
-int translations;
+item_number *ritem = NULL;
+unsigned int nritems = 0;
-int max_user_token_number;
+rule *rules = NULL;
+rule_number nrules = 0;
-int semantic_parser;
+symbol **symbols = NULL;
+int nsyms = 0;
+int ntokens = 1;
+int nvars = 0;
-int pure_parser;
+symbol_number *token_translations = NULL;
-int error_token_number;
+int max_user_token_number = 256;
-/* This is to avoid linker problems which occur on VMS when using GCC,
- when the file in question contains data definitions only. */
+int glr_parser = 0;
+int pure_parser = 0;
-static void
-dummy (void)
+
+/*--------------------------------------------------------------.
+| Return true IFF the rule has a `number' smaller than NRULES. |
+`--------------------------------------------------------------*/
+
+bool
+rule_useful_p (rule *r)
+{
+ return r->number < nrules;
+}
+
+
+/*-------------------------------------------------------------.
+| Return true IFF the rule has a `number' higher than NRULES. |
+`-------------------------------------------------------------*/
+
+bool
+rule_useless_p (rule *r)
+{
+ return r->number >= nrules;
+}
+
+
+/*--------------------------------------------------------------------.
+| Return true IFF the rule is not flagged as useful *and* is useful. |
+| In other words, it was discarded because of conflicts. |
+`--------------------------------------------------------------------*/
+
+bool
+rule_never_reduced_p (rule *r)
+{
+ return !r->useful && r->number < nrules;
+}
+
+
+/*----------------------------------------------------------------.
+| Print this RULE's number and lhs on OUT. If a PREVIOUS_LHS was |
+| already displayed (by a previous call for another rule), avoid |
+| useless repetitions. |
+`----------------------------------------------------------------*/
+
+void
+rule_lhs_print (rule *r, symbol *previous_lhs, FILE *out)
+{
+ fprintf (out, " %3d ", r->number);
+ if (previous_lhs != r->lhs)
+ {
+ fprintf (out, "%s:", r->lhs->tag);
+ }
+ else
+ {
+ int n;
+ for (n = strlen (previous_lhs->tag); n > 0; --n)
+ fputc (' ', out);
+ fputc ('|', out);
+ }
+}
+
+
+/*--------------------------------------.
+| Return the number of symbols in RHS. |
+`--------------------------------------*/
+
+int
+rule_rhs_length (rule *r)
+{
+ int res = 0;
+ item_number *rhsp;
+ for (rhsp = r->rhs; *rhsp >= 0; ++rhsp)
+ ++res;
+ return res;
+}
+
+
+/*-------------------------------.
+| Print this rule's RHS on OUT. |
+`-------------------------------*/
+
+void
+rule_rhs_print (rule *r, FILE *out)
+{
+ if (*r->rhs >= 0)
+ {
+ item_number *rp;
+ for (rp = r->rhs; *rp >= 0; rp++)
+ fprintf (out, " %s", symbols[*rp]->tag);
+ fputc ('\n', out);
+ }
+ else
+ {
+ fprintf (out, " /* %s */\n", _("empty"));
+ }
+}
+
+
+/*-------------------------.
+| Print this rule on OUT. |
+`-------------------------*/
+
+void
+rule_print (rule *r, FILE *out)
+{
+ fprintf (out, "%s:", r->lhs->tag);
+ rule_rhs_print (r, out);
+}
+
+
+/*------------------------.
+| Dump RITEM for traces. |
+`------------------------*/
+
+void
+ritem_print (FILE *out)
+{
+ unsigned int i;
+ fputs ("RITEM\n", out);
+ for (i = 0; i < nritems; ++i)
+ if (ritem[i] >= 0)
+ fprintf (out, " %s", symbols[ritem[i]]->tag);
+ else
+ fprintf (out, " (rule %d)\n", item_number_as_rule_number (ritem[i]));
+ fputs ("\n\n", out);
+}
+
+
+/*------------------------------------------.
+| Return the size of the longest rule RHS. |
+`------------------------------------------*/
+
+size_t
+ritem_longest_rhs (void)
+{
+ int max = 0;
+ rule_number r;
+
+ for (r = 0; r < nrules; ++r)
+ {
+ int length = rule_rhs_length (&rules[r]);
+ if (length > max)
+ max = length;
+ }
+
+ return max;
+}
+
+
+/*-----------------------------------------------------------------.
+| Print the grammar's rules that match FILTER on OUT under TITLE. |
+`-----------------------------------------------------------------*/
+
+void
+grammar_rules_partial_print (FILE *out, const char *title,
+ rule_filter filter)
+{
+ int r;
+ bool first = true;
+ symbol *previous_lhs = NULL;
+
+ /* rule # : LHS -> RHS */
+ for (r = 0; r < nrules + nuseless_productions; r++)
+ {
+ if (filter && !filter (&rules[r]))
+ continue;
+ if (first)
+ fprintf (out, "%s\n\n", title);
+ else if (previous_lhs && previous_lhs != rules[r].lhs)
+ fputc ('\n', out);
+ first = false;
+ rule_lhs_print (&rules[r], previous_lhs, out);
+ rule_rhs_print (&rules[r], out);
+ previous_lhs = rules[r].lhs;
+ }
+ if (!first)
+ fputs ("\n\n", out);
+}
+
+
+/*------------------------------------------.
+| Print the grammar's useful rules on OUT. |
+`------------------------------------------*/
+
+void
+grammar_rules_print (FILE *out)
+{
+ grammar_rules_partial_print (out, _("Grammar"), rule_useful_p);
+}
+
+
+/*-------------------.
+| Dump the grammar. |
+`-------------------*/
+
+void
+grammar_dump (FILE *out, const char *title)
+{
+ fprintf (out, "%s\n\n", title);
+ fprintf (out,
+ "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nritems = %d\n\n",
+ ntokens, nvars, nsyms, nrules, nritems);
+
+
+ fprintf (out, "Variables\n---------\n\n");
+ {
+ symbol_number i;
+ fprintf (out, "Value Sprec Sassoc Tag\n");
+
+ for (i = ntokens; i < nsyms; i++)
+ fprintf (out, "%5d %5d %5d %s\n",
+ i,
+ symbols[i]->prec, symbols[i]->assoc,
+ symbols[i]->tag);
+ fprintf (out, "\n\n");
+ }
+
+ fprintf (out, "Rules\n-----\n\n");
+ {
+ rule_number i;
+ fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n");
+ for (i = 0; i < nrules + nuseless_productions; i++)
+ {
+ rule *rule_i = &rules[i];
+ item_number *r = NULL;
+ unsigned int rhs_itemno = rule_i->rhs - ritem;
+ unsigned int rhs_count = 0;
+ /* Find the last RHS index in ritems. */
+ for (r = rule_i->rhs; *r >= 0; ++r)
+ ++rhs_count;
+ fprintf (out, "%3d (%2d, %2d, %2d, %2u-%2u) %2d ->",
+ i,
+ rule_i->prec ? rule_i->prec->prec : 0,
+ rule_i->prec ? rule_i->prec->assoc : 0,
+ rule_i->useful,
+ rhs_itemno,
+ rhs_itemno + rhs_count - 1,
+ rule_i->lhs->number);
+ /* Dumped the RHS. */
+ for (r = rule_i->rhs; *r >= 0; r++)
+ fprintf (out, " %3d", *r);
+ fprintf (out, " [%d]\n", item_number_as_rule_number (*r));
+ }
+ }
+ fprintf (out, "\n\n");
+
+ fprintf (out, "Rules interpreted\n-----------------\n\n");
+ {
+ rule_number r;
+ for (r = 0; r < nrules + nuseless_productions; r++)
+ {
+ fprintf (out, "%-5d ", r);
+ rule_print (&rules[r], out);
+ }
+ }
+ fprintf (out, "\n\n");
+}
+
+
+/*------------------------------------------------------------------.
+| Report on STDERR the rules that are not flagged USEFUL, using the |
+| MESSAGE (which can be `useless rule' when invoked after grammar |
+| reduction, or `never reduced' after conflicts were taken into |
+| account). |
+`------------------------------------------------------------------*/
+
+void
+grammar_rules_never_reduced_report (const char *message)
+{
+ rule_number r;
+ for (r = 0; r < nrules ; ++r)
+ if (!rules[r].useful)
+ {
+ location_print (stderr, rules[r].location);
+ fprintf (stderr, ": %s: %s: ",
+ _("warning"), message);
+ rule_print (&rules[r], stderr);
+ }
+}
+
+void
+grammar_free (void)
{
+ XFREE (ritem);
+ free (rules);
+ XFREE (token_translations);
+ /* Free the symbol table data structure. */
+ symbols_free ();
+ free_merger_functions ();
}
projects / bison.git / blobdiff