Split the default %destructor/%printer into two kinds: <*> and <!>.

[bison.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index d2fe981f7603258ae1d0ecc13956789403eebd4e..6b62ccd617aeb79e17d5e7731d2c8c6021176152 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,7 +1,7 @@
 /* Output the generated parsing program for Bison.
 
 /* Output the generated parsing program for Bison.
 

-   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003
-   Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -17,12 +17,13 @@
 
    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
 
    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.  */
-
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */

 
 

+#include <config.h>

 #include "system.h"
 
 #include "system.h"
 

+#include <configmake.h>

 #include <error.h>
 #include <get-errno.h>
 #include <quotearg.h>
 #include <error.h>
 #include <get-errno.h>
 #include <quotearg.h>


@@ -36,18 +37,14 @@
 #include "muscle_tab.h"
 #include "output.h"
 #include "reader.h"
 #include "muscle_tab.h"
 #include "output.h"
 #include "reader.h"

+#include "scan-code.h"    /* max_left_semantic_context */
+#include "scan-skel.h"

 #include "symtab.h"
 #include "tables.h"
 
 #include "symtab.h"
 #include "tables.h"
 

-/* From src/scan-skel.l. */
-void scan_skel (FILE *);
-

 
 static struct obstack format_obstack;
 
 
 static struct obstack format_obstack;
 

-bool error_verbose = false;
-
-

 
 /*-------------------------------------------------------------------.
 | Create a function NAME which associates to the muscle NAME the     |
 
 /*-------------------------------------------------------------------.
 | Create a function NAME which associates to the muscle NAME the     |


@@ -60,7 +57,7 @@ bool error_verbose = false;
 #define GENERATE_MUSCLE_INSERT_TABLE(Name, Type)                       \
                                                                        \
 static void                                                            \
 #define GENERATE_MUSCLE_INSERT_TABLE(Name, Type)                       \
                                                                        \
 static void                                                            \

-Name (const char *name,                                                        \
+Name (char const *name,                                                        \

       Type *table_data,                                                        \
       Type first,                                                      \
       int begin,                                                       \
       Type *table_data,                                                        \
       Type first,                                                      \
       int begin,                                                       \


@@ -106,7 +103,6 @@ Name (const char *name,                                                     \
 
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_unsigned_int_table, unsigned int)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_int_table, int)
 
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_unsigned_int_table, unsigned int)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_int_table, int)

-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_short_table, short)

 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_base_table, base_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_rule_number_table, rule_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_symbol_number_table, symbol_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_base_table, base_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_rule_number_table, rule_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_symbol_number_table, symbol_number)


@@ -114,17 +110,17 @@ GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)
 
 
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)
 
 

-/*----------------------------------------------------------------------.
-| Print to OUT a representation of FILENAME escaped both for C and M4.  |
-`----------------------------------------------------------------------*/
+/*--------------------------------------------------------------------.
+| Print to OUT a representation of STRING escaped both for C and M4.  |
+`--------------------------------------------------------------------*/

 
 static void
 
 static void

-escaped_file_name_output (FILE *out, char const *filename)
+escaped_output (FILE *out, char const *string)

 {
   char const *p;
   fprintf (out, "[[");
 
 {
   char const *p;
   fprintf (out, "[[");
 

-  for (p = quotearg_style (c_quoting_style, filename); *p; p++)
+  for (p = quotearg_style (c_quoting_style, string); *p; p++)

     switch (*p)
       {
       case '$': fputs ("$][", out); break;
     switch (*p)
       {
       case '$': fputs ("$][", out); break;


@@ -146,6 +142,7 @@ escaped_file_name_output (FILE *out, char const *filename)
 static void
 prepare_symbols (void)
 {
 static void
 prepare_symbols (void)
 {

+  MUSCLE_INSERT_BOOL ("token_table", token_table_flag);

   MUSCLE_INSERT_INT ("tokens_number", ntokens);
   MUSCLE_INSERT_INT ("nterms_number", nvars);
   MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);
   MUSCLE_INSERT_INT ("tokens_number", ntokens);
   MUSCLE_INSERT_INT ("nterms_number", nvars);
   MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);


@@ -163,7 +160,7 @@ prepare_symbols (void)
     int j = 2;
     for (i = 0; i < nsyms; i++)
       {
     int j = 2;
     for (i = 0; i < nsyms; i++)
       {

-       const char *cp = quotearg_style (c_quoting_style, symbols[i]->tag);
+       char const *cp = quotearg_style (c_quoting_style, symbols[i]->tag);

        /* Width of the next token, including the two quotes, the
           comma and the space.  */
        int width = strlen (cp) + 2;
        /* Width of the next token, including the two quotes, the
           comma and the space.  */
        int width = strlen (cp) + 2;


@@ -180,9 +177,7 @@ prepare_symbols (void)
        obstack_1grow (&format_obstack, ',');
        j += width;
       }
        obstack_1grow (&format_obstack, ',');
        j += width;
       }

-    /* Add a NULL entry to list of tokens (well, 0, as NULL might not be
-       defined).  */
-    obstack_sgrow (&format_obstack, " 0");
+    obstack_sgrow (&format_obstack, " ]b4_null[");

 
     /* Finish table and store. */
     obstack_1grow (&format_obstack, 0);
 
     /* Finish table and store. */
     obstack_1grow (&format_obstack, 0);


@@ -192,7 +187,7 @@ prepare_symbols (void)
   /* Output YYTOKNUM. */
   {
     int i;
   /* Output YYTOKNUM. */
   {
     int i;

-    int *values = MALLOC (values, ntokens);
+    int *values = xnmalloc (ntokens, sizeof *values);

     for (i = 0; i < ntokens; ++i)
       values[i] = symbols[i]->user_token_number;
     muscle_insert_int_table ("toknum", values,
     for (i = 0; i < ntokens; ++i)
       values[i] = symbols[i]->user_token_number;
     muscle_insert_int_table ("toknum", values,


@@ -212,13 +207,13 @@ prepare_rules (void)
 {
   rule_number r;
   unsigned int i = 0;
 {
   rule_number r;
   unsigned int i = 0;

-  item_number *rhs = MALLOC (rhs, nritems);
-  unsigned int *prhs = MALLOC (prhs, nrules);
-  unsigned int *rline = MALLOC (rline, nrules);
-  symbol_number *r1 = MALLOC (r1, nrules);
-  unsigned int *r2 = MALLOC (r2, nrules);
-  short *dprec = MALLOC (dprec, nrules);
-  short *merger = MALLOC (merger, nrules);
+  item_number *rhs = xnmalloc (nritems, sizeof *rhs);
+  unsigned int *prhs = xnmalloc (nrules, sizeof *prhs);
+  unsigned int *rline = xnmalloc (nrules, sizeof *rline);
+  symbol_number *r1 = xnmalloc (nrules, sizeof *r1);
+  unsigned int *r2 = xnmalloc (nrules, sizeof *r2);
+  int *dprec = xnmalloc (nrules, sizeof *dprec);
+  int *merger = xnmalloc (nrules, sizeof *merger);

 
   for (r = 0; r < nrules; ++r)
     {
 
   for (r = 0; r < nrules; ++r)
     {


@@ -241,16 +236,15 @@ prepare_rules (void)
       /* Merger-function index (GLR).  */
       merger[r] = rules[r].merger;
     }
       /* Merger-function index (GLR).  */
       merger[r] = rules[r].merger;
     }

-  if (i != nritems)
-    abort ();
+  aver (i == nritems);

 
   muscle_insert_item_number_table ("rhs", rhs, ritem[0], 1, nritems);
   muscle_insert_unsigned_int_table ("prhs", prhs, 0, 0, nrules);
   muscle_insert_unsigned_int_table ("rline", rline, 0, 0, nrules);
   muscle_insert_symbol_number_table ("r1", r1, 0, 0, nrules);
   muscle_insert_unsigned_int_table ("r2", r2, 0, 0, nrules);
 
   muscle_insert_item_number_table ("rhs", rhs, ritem[0], 1, nritems);
   muscle_insert_unsigned_int_table ("prhs", prhs, 0, 0, nrules);
   muscle_insert_unsigned_int_table ("rline", rline, 0, 0, nrules);
   muscle_insert_symbol_number_table ("r1", r1, 0, 0, nrules);
   muscle_insert_unsigned_int_table ("r2", r2, 0, 0, nrules);

-  muscle_insert_short_table ("dprec", dprec, 0, 0, nrules);
-  muscle_insert_short_table ("merger", merger, 0, 0, nrules);
+  muscle_insert_int_table ("dprec", dprec, 0, 0, nrules);
+  muscle_insert_int_table ("merger", merger, 0, 0, nrules);

 
   MUSCLE_INSERT_INT ("rules_number", nrules);
   MUSCLE_INSERT_INT ("max_left_semantic_context", max_left_semantic_context);
 
   MUSCLE_INSERT_INT ("rules_number", nrules);
   MUSCLE_INSERT_INT ("max_left_semantic_context", max_left_semantic_context);


@@ -272,7 +266,7 @@ static void
 prepare_states (void)
 {
   state_number i;
 prepare_states (void)
 {
   state_number i;

-  symbol_number *values = MALLOC (values, nstates);
+  symbol_number *values = xnmalloc (nstates, sizeof *values);

   for (i = 0; i < nstates; ++i)
     values[i] = states[i]->accessing_symbol;
   muscle_insert_symbol_number_table ("stos", values,
   for (i = 0; i < nstates; ++i)
     values[i] = states[i]->accessing_symbol;
   muscle_insert_symbol_number_table ("stos", values,


@@ -295,20 +289,16 @@ user_actions_output (FILE *out)
 {
   rule_number r;
 
 {
   rule_number r;
 

-  fputs ("m4_define([b4_actions], \n[[", out);
+  fputs ("m4_define([b4_actions], \n[", out);

   for (r = 0; r < nrules; ++r)
     if (rules[r].action)
       {
   for (r = 0; r < nrules; ++r)
     if (rules[r].action)
       {

-       fprintf (out, "  case %d:\n", r + 1);
-
-       fprintf (out, "]b4_syncline([[%d]], ",
+       fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,

                 rules[r].action_location.start.line);
                 rules[r].action_location.start.line);

-       escaped_file_name_output (out, rules[r].action_location.start.file);
-       fprintf (out, ")[\n");
-       fprintf (out, "    %s\n    break;\n\n",
-                rules[r].action);
+       escaped_output (out, rules[r].action_location.start.file);
+       fprintf (out, ")\n[    %s]])\n\n", rules[r].action);

       }
       }

-  fputs ("]])\n\n", out);
+  fputs ("])\n\n", out);

 }
 
 /*--------------------------------------.
 }
 
 /*--------------------------------------.


@@ -353,8 +343,7 @@ token_definitions_output (FILE *out)
       /* At this stage, if there are literal aliases, they are part of
         SYMBOLS, so we should not find symbols which are the aliases
         here.  */
       /* At this stage, if there are literal aliases, they are part of
         SYMBOLS, so we should not find symbols which are the aliases
         here.  */

-      if (number == USER_NUMBER_ALIAS)
-       abort ();
+      aver (number != USER_NUMBER_ALIAS);

 
       /* Skip error token.  */
       if (sym == errtoken)
 
       /* Skip error token.  */
       if (sym == errtoken)


@@ -376,7 +365,7 @@ token_definitions_output (FILE *out)
       if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))
        continue;
 
       if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))
        continue;
 

-      fprintf (out, "%s[[[%s]], [%d]]",
+      fprintf (out, "%s[[[%s]], %d]",

               sep, sym->tag, number);
       sep = ",\n";
     }
               sep, sym->tag, number);
       sep = ",\n";
     }


@@ -396,22 +385,24 @@ symbol_destructors_output (FILE *out)
 
   fputs ("m4_define([b4_symbol_destructors], \n[", out);
   for (i = 0; i < nsyms; ++i)
 
   fputs ("m4_define([b4_symbol_destructors], \n[", out);
   for (i = 0; i < nsyms; ++i)

-    if (symbols[i]->destructor)
+    if (symbol_destructor_get (symbols[i]))

       {
        symbol *sym = symbols[i];
 
        /* Filename, lineno,
           Symbol-name, Symbol-number,
       {
        symbol *sym = symbols[i];
 
        /* Filename, lineno,
           Symbol-name, Symbol-number,

-          destructor, typename. */
+          destructor, optional typename.  */

        fprintf (out, "%s[", sep);
        sep = ",\n";
        fprintf (out, "%s[", sep);
        sep = ",\n";

-       escaped_file_name_output (out, sym->destructor_location.start.file);
-       fprintf (out, ", [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
-                sym->destructor_location.start.line,
-                sym->tag,
-                sym->number,
-                sym->destructor,
-                sym->type_name);
+       escaped_output (out, symbol_destructor_location_get (sym).start.file);
+       fprintf (out, ", %d, ",
+                symbol_destructor_location_get (sym).start.line);
+       escaped_output (out, sym->tag);
+       fprintf (out, ", %d, [[%s]]", sym->number,
+                symbol_destructor_get (sym));
+       if (sym->type_name)
+         fprintf (out, ", [[%s]]", sym->type_name);
+       fputc (']', out);

       }
   fputs ("])\n\n", out);
 }
       }
   fputs ("])\n\n", out);
 }


@@ -429,22 +420,22 @@ symbol_printers_output (FILE *out)
 
   fputs ("m4_define([b4_symbol_printers], \n[", out);
   for (i = 0; i < nsyms; ++i)
 
   fputs ("m4_define([b4_symbol_printers], \n[", out);
   for (i = 0; i < nsyms; ++i)

-    if (symbols[i]->printer)
+    if (symbol_printer_get (symbols[i]))

       {
        symbol *sym = symbols[i];
 
        /* Filename, lineno,
           Symbol-name, Symbol-number,
       {
        symbol *sym = symbols[i];
 
        /* Filename, lineno,
           Symbol-name, Symbol-number,

-          printer, typename. */
+          printer, optional typename.  */

        fprintf (out, "%s[", sep);
        sep = ",\n";
        fprintf (out, "%s[", sep);
        sep = ",\n";

-       escaped_file_name_output (out, sym->printer_location.start.file);
-       fprintf (out, ", [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
-                sym->printer_location.start.line,
-                sym->tag,
-                sym->number,
-                sym->printer,
-                sym->type_name);
+       escaped_output (out, symbol_printer_location_get (sym).start.file);
+       fprintf (out, ", %d, ", symbol_printer_location_get (sym).start.line);
+       escaped_output (out, sym->tag);
+       fprintf (out, ", %d, [[%s]]", sym->number, symbol_printer_get (sym));
+       if (sym->type_name)
+         fprintf (out, ", [[%s]]", sym->type_name);
+       fputc (']', out);

       }
   fputs ("])\n\n", out);
 }
       }
   fputs ("])\n\n", out);
 }


@@ -494,7 +485,7 @@ prepare_actions (void)
   muscle_insert_unsigned_int_table ("conflict_list_heads", conflict_table,
                                    conflict_table[0], 1, high + 1);
   muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list,
   muscle_insert_unsigned_int_table ("conflict_list_heads", conflict_table,
                                    conflict_table[0], 1, high + 1);
   muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list,

-                                   conflict_list[0], 1, conflict_list_cnt);
+                                   0, 1, conflict_list_cnt);

 }
 
 \f
 }
 
 \f


@@ -508,7 +499,7 @@ output_skeleton (void)
   FILE *in;
   FILE *out;
   int filter_fd[2];
   FILE *in;
   FILE *out;
   int filter_fd[2];

-  char const *argv[6];
+  char const *argv[7];

   pid_t pid;
 
   /* Compute the names of the package data dir and skeleton file.
   pid_t pid;
 
   /* Compute the names of the package data dir and skeleton file.


@@ -516,8 +507,9 @@ output_skeleton (void)
      installation.  A faulty installation can cause deadlock, so a
      cheap sanity check is worthwhile.  */
   char const m4sugar[] = "m4sugar/m4sugar.m4";
      installation.  A faulty installation can cause deadlock, so a
      cheap sanity check is worthwhile.  */
   char const m4sugar[] = "m4sugar/m4sugar.m4";

+  char const m4bison[] = "bison.m4";

   char *full_m4sugar;
   char *full_m4sugar;

-  char *full_cm4;
+  char *full_m4bison;

   char *full_skeleton;
   char const *p;
   char const *m4 = (p = getenv ("M4")) ? p : M4;
   char *full_skeleton;
   char const *p;
   char const *m4 = (p = getenv ("M4")) ? p : M4;


@@ -533,8 +525,8 @@ output_skeleton (void)
   full_skeleton[pkgdatadirlen] = '/';
   strcpy (full_skeleton + pkgdatadirlen + 1, m4sugar);
   full_m4sugar = xstrdup (full_skeleton);
   full_skeleton[pkgdatadirlen] = '/';
   strcpy (full_skeleton + pkgdatadirlen + 1, m4sugar);
   full_m4sugar = xstrdup (full_skeleton);

-  strcpy (full_skeleton + pkgdatadirlen + 1, "c.m4");
-  full_cm4 = xstrdup (full_skeleton);
+  strcpy (full_skeleton + pkgdatadirlen + 1, m4bison);
+  full_m4bison = xstrdup (full_skeleton);

   strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);
   xfclose (xfopen (full_m4sugar, "r"));
 
   strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);
   xfclose (xfopen (full_m4sugar, "r"));
 


@@ -542,24 +534,26 @@ output_skeleton (void)
 
   if (trace_flag & trace_tools)
     fprintf (stderr, "running: %s %s - %s %s\n",
 
   if (trace_flag & trace_tools)
     fprintf (stderr, "running: %s %s - %s %s\n",

-            m4, full_m4sugar, full_cm4, full_skeleton);
+            m4, full_m4sugar, full_m4bison, full_skeleton);

 
   argv[0] = m4;
   argv[1] = full_m4sugar;
   argv[2] = "-";
 
   argv[0] = m4;
   argv[1] = full_m4sugar;
   argv[2] = "-";

-  argv[3] = full_cm4;
+  argv[3] = full_m4bison;

   argv[4] = full_skeleton;
   argv[4] = full_skeleton;

-  argv[5] = NULL;
+  argv[5] = trace_flag & trace_m4 ? "-dV" : NULL;
+  argv[6] = NULL;

 
   init_subpipe ();
   pid = create_subpipe (argv, filter_fd);
 
   init_subpipe ();
   pid = create_subpipe (argv, filter_fd);

+  free (full_m4bison);

   free (full_m4sugar);
   free (full_m4sugar);

-  free (full_cm4);

   free (full_skeleton);
 
   out = fdopen (filter_fd[0], "w");
   if (! out)
   free (full_skeleton);
 
   out = fdopen (filter_fd[0], "w");
   if (! out)

-    error (EXIT_FAILURE, get_errno (), "fdopen");
+    error (EXIT_FAILURE, get_errno (),
+          "fdopen");

 
   /* Output the definitions of all the muscles.  */
   fputs ("m4_init()\n", out);
 
   /* Output the definitions of all the muscles.  */
   fputs ("m4_init()\n", out);


@@ -578,9 +572,11 @@ output_skeleton (void)
 
   /* Read and process m4's output.  */
   timevar_push (TV_M4);
 
   /* Read and process m4's output.  */
   timevar_push (TV_M4);

+  end_of_output_subpipe (pid, filter_fd);

   in = fdopen (filter_fd[1], "r");
   if (! in)
   in = fdopen (filter_fd[1], "r");
   if (! in)

-    error (EXIT_FAILURE, get_errno (), "fdopen");
+    error (EXIT_FAILURE, get_errno (),
+          "fdopen");

   scan_skel (in);
   xfclose (in);
   reap_subpipe (pid, m4);
   scan_skel (in);
   xfclose (in);
   reap_subpipe (pid, m4);


@@ -591,15 +587,32 @@ static void
 prepare (void)
 {
   /* Flags. */
 prepare (void)
 {
   /* Flags. */

-  MUSCLE_INSERT_BOOL ("debug", debug_flag);
+  MUSCLE_INSERT_BOOL ("debug_flag", debug_flag);

   MUSCLE_INSERT_BOOL ("defines_flag", defines_flag);
   MUSCLE_INSERT_BOOL ("defines_flag", defines_flag);

-  MUSCLE_INSERT_BOOL ("error_verbose", error_verbose);
+  MUSCLE_INSERT_BOOL ("error_verbose_flag", error_verbose);
+  MUSCLE_INSERT_BOOL ("glr_flag", glr_parser);

   MUSCLE_INSERT_BOOL ("locations_flag", locations_flag);
   MUSCLE_INSERT_BOOL ("locations_flag", locations_flag);

-  MUSCLE_INSERT_BOOL ("pure", pure_parser);
+  MUSCLE_INSERT_BOOL ("nondeterministic_flag", nondeterministic_parser);
+  MUSCLE_INSERT_BOOL ("pure_flag", pure_parser);
+  MUSCLE_INSERT_BOOL ("push_flag", push_parser);

   MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
   MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);

+  MUSCLE_INSERT_BOOL ("tag_seen_flag", tag_seen);
+  MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag);

 
   /* File names.  */
 
   /* File names.  */

-  MUSCLE_INSERT_STRING ("prefix", spec_name_prefix ? spec_name_prefix : "yy");
+  if (spec_name_prefix)
+    MUSCLE_INSERT_STRING ("prefix", spec_name_prefix);
+
+#define DEFINE(Name) MUSCLE_INSERT_STRING (#Name, Name ? Name : "")
+  DEFINE (dir_prefix);
+  DEFINE (parser_file_name);
+  DEFINE (spec_defines_file);
+  DEFINE (spec_file_prefix);
+  DEFINE (spec_graph_file);
+  DEFINE (spec_name_prefix);
+  DEFINE (spec_outfile);
+  DEFINE (spec_verbose_file);
+#undef DEFINE

 
   /* User Code.  */
   obstack_1grow (&pre_prologue_obstack, 0);
 
   /* User Code.  */
   obstack_1grow (&pre_prologue_obstack, 0);


@@ -616,8 +629,12 @@ prepare (void)
        skeleton = "yacc.c";
     }
 
        skeleton = "yacc.c";
     }
 

-  /* Parse the skeleton file and output the needed parsers.  */
-  MUSCLE_INSERT_C_STRING ("skeleton", skeleton);
+  /* About the skeletons. */
+  {
+    char const *pkgdatadir = getenv ("BISON_PKGDATADIR");
+    MUSCLE_INSERT_STRING ("pkgdatadir", pkgdatadir ? pkgdatadir : PKGDATADIR);
+    MUSCLE_INSERT_C_STRING ("skeleton", skeleton);
+  }

 }
 
 
 }