* data/Makefile.am (dist_pkgdata_DATA): Remove push.c.

[bison.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index 8b2d314f6bf32bffe8f4b27b97408f0e92787d93..1a1d7b3aac5ee88d1ead6e0448e82cfe36ef3750 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,1484 +1,639 @@
-/* Output the generated parsing program for bison,
-   Copyright (C) 1984, 1986, 1989, 1992 Free Software Foundation, Inc.
+/* Output the generated parsing program for Bison.

 
 

-This file is part of Bison, the GNU Compiler Compiler.
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006, 2007 Free Software Foundation, Inc.

 
 

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

 
 

-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 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.

 
 

-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.  */
+   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/>.  */

 
 

-/* functions to output parsing data to various files.  Entries are:
-
-  output_headers ()
-
-Output constant strings to the beginning of certain files.
-
-  output_trailers()
-
-Output constant strings to the ends of certain files.
-
-  output ()
-
-Output the parsing tables and the parser code to ftable.
-
-The parser tables consist of these tables.
-Starred ones needed only for the semantic parser.
-Double starred are output only if switches are set.
-
-yytranslate = vector mapping yylex's token numbers into bison's token numbers.
-
-** yytname = vector of string-names indexed by bison token number
-
-** yytoknum = vector of yylex token numbers corresponding to entries in yytname
-
-yyrline = vector of line-numbers of all rules.  For yydebug printouts.
-
-yyrhs = vector of items of all rules.
-        This is exactly what ritems contains.  For yydebug and for semantic
-       parser.
-
-yyprhs[r] = index in yyrhs of first item for rule r.
-
-yyr1[r] = symbol number of symbol that rule r derives.
-
-yyr2[r] = number of symbols composing right hand side of rule r.
-
-* yystos[s] = the symbol number of the symbol that leads to state s.
-
-yydefact[s] = default rule to reduce with in state s,
-             when yytable doesn't specify something else to do.
-             Zero means the default is an error.
-
-yydefgoto[i] = default state to go to after a reduction of a rule that
-              generates variable ntokens + i, except when yytable
-              specifies something else to do.
-
-yypact[s] = index in yytable of the portion describing state s.
-            The lookahead token's type is used to index that portion
-            to find out what to do.
-
-           If the value in yytable is positive,
-           we shift the token and go to that state.
-
-           If the value is negative, it is minus a rule number to reduce by.
-
-           If the value is zero, the default action from yydefact[s] is used.
-
-yypgoto[i] = the index in yytable of the portion describing 
-             what to do after reducing a rule that derives variable i + ntokens.
-             This portion is indexed by the parser state number, s,
-            as of before the text for this nonterminal was read.
-            The value from yytable is the state to go to if 
-             the corresponding value in yycheck is s.
-
-yytable = a vector filled with portions for different uses,
-          found via yypact and yypgoto.
-
-yycheck = a vector indexed in parallel with yytable.
-         It indicates, in a roundabout way, the bounds of the
-         portion you are trying to examine.
-
-         Suppose that the portion of yytable starts at index p
-         and the index to be examined within the portion is i.
-         Then if yycheck[p+i] != i, i is outside the bounds
-         of what is actually allocated, and the default
-         (from yydefact or yydefgoto) should be used.
-         Otherwise, yytable[p+i] should be used.
-
-YYFINAL = the state number of the termination state.
-YYFLAG = most negative short int.  Used to flag ??
-YYNTBASE = ntokens.
+#include <config.h>
+#include "system.h"

 
 

-*/
+#include <configmake.h>
+#include <error.h>
+#include <get-errno.h>
+#include <quotearg.h>
+#include <subpipe.h>
+#include <timevar.h>

 
 

-#include <stdio.h>
-#include "system.h"
-#include "machine.h"
-#include "new.h"
+#include "complain.h"

 #include "files.h"
 #include "files.h"

+#include "getargs.h"

 #include "gram.h"
 #include "gram.h"

-#include "state.h"
-
-
-extern int debugflag;
-extern int nolinesflag;
-extern int noparserflag;
-extern int toknumflag;
-
-extern char **tags;
-extern int *user_toknums;
-extern int tokensetsize;
-extern int final_state;
-extern core **state_table;
-extern shifts **shift_table;
-extern errs **err_table;
-extern reductions **reduction_table;
-extern short *accessing_symbol;
-extern unsigned *LA;
-extern short *LAruleno;
-extern short *lookaheads;
-extern char *consistent;
-extern short *goto_map;
-extern short *from_state;
-extern short *to_state;
-
-void output_token_translations();
-void output_gram();
-void output_stos();
-void output_rule_data();
-void output_defines();
-void output_actions();
-void token_actions();
-void save_row();
-void goto_actions();
-void save_column();
-void sort_actions();
-void pack_table();
-void output_base();
-void output_table();
-void output_check();
-void output_parser();
-void output_program();
-void free_itemset();
-void free_shifts();
-void free_reductions();
-void free_itemsets();
-int action_row();
-int default_goto();
-int matching_state();
-int pack_vector();
-
-extern void berror();
-extern void fatals();
-extern char *int_to_string();
-extern void reader_output_yylsp();
-
-static int nvectors;
-static int nentries;
-static short **froms;
-static short **tos;
-static short *tally;
-static short *width;
-static short *actrow;
-static short *state_count;
-static short *order;
-static short *base;
-static short *pos;
-static short *table;
-static short *check;
-static int lowzero;
-static int high;
-
-
-
-#define        GUARDSTR        "\n#include \"%s\"\nextern int yyerror;\n\
-extern int yycost;\nextern char * yymsg;\nextern YYSTYPE yyval;\n\n\
-yyguard(n, yyvsp, yylsp)\nregister int n;\nregister YYSTYPE *yyvsp;\n\
-register YYLTYPE *yylsp;\n\
-{\n  yyerror = 0;\nyycost = 0;\n  yymsg = 0;\nswitch (n)\n    {"
-
-#define        ACTSTR          "\n#include \"%s\"\nextern YYSTYPE yyval;\
-\nextern int yychar;\
-yyaction(n, yyvsp, yylsp)\nregister int n;\nregister YYSTYPE *yyvsp;\n\
-register YYLTYPE *yylsp;\n{\n  switch (n)\n{"
-
-#define        ACTSTR_SIMPLE   "\n  switch (yyn) {\n"
-
-
-void
-output_headers()
-{
-  if (semantic_parser)
-    fprintf(fguard, GUARDSTR, attrsfile);
-
-  if (noparserflag)
-       return;
-
-  fprintf(faction, (semantic_parser ? ACTSTR : ACTSTR_SIMPLE), attrsfile);
-/*  if (semantic_parser)       JF moved this below
-    fprintf(ftable, "#include \"%s\"\n", attrsfile);
-  fprintf(ftable, "#include <stdio.h>\n\n");
-*/
-
-  /* Rename certain symbols if -p was specified.  */
-  if (spec_name_prefix)
-    {
-      fprintf(ftable, "#define yyparse %sparse\n", spec_name_prefix);
-      fprintf(ftable, "#define yylex %slex\n", spec_name_prefix);
-      fprintf(ftable, "#define yyerror %serror\n", spec_name_prefix);
-      fprintf(ftable, "#define yylval %slval\n", spec_name_prefix);
-      fprintf(ftable, "#define yychar %schar\n", spec_name_prefix);
-      fprintf(ftable, "#define yydebug %sdebug\n", spec_name_prefix);
-      fprintf(ftable, "#define yynerrs %snerrs\n", spec_name_prefix);
-    }
+#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"
+
+
+static struct obstack format_obstack;
+
+
+/*-------------------------------------------------------------------.
+| Create a function NAME which associates to the muscle NAME the     |
+| result of formatting the FIRST and then TABLE_DATA[BEGIN..END[ (of |
+| TYPE), and to the muscle NAME_max, the max value of the            |
+| TABLE_DATA.                                                        |
+`-------------------------------------------------------------------*/
+
+
+#define GENERATE_MUSCLE_INSERT_TABLE(Name, Type)                       \
+                                                                       \
+static void                                                            \
+Name (char const *name,                                                        \
+      Type *table_data,                                                        \
+      Type first,                                                      \
+      int begin,                                                       \
+      int end)                                                         \
+{                                                                      \
+  Type min = first;                                                    \
+  Type max = first;                                                    \
+  long int lmin;                                                       \
+  long int lmax;                                                       \
+  int i;                                                               \
+  int j = 1;                                                           \
+                                                                       \
+  obstack_fgrow1 (&format_obstack, "%6d", first);                      \
+  for (i = begin; i < end; ++i)                                                \
+    {                                                                  \
+      obstack_1grow (&format_obstack, ',');                            \
+      if (j >= 10)                                                     \
+       {                                                               \
+         obstack_sgrow (&format_obstack, "\n  ");                      \
+         j = 1;                                                        \
+       }                                                               \
+      else                                                             \
+       ++j;                                                            \
+      obstack_fgrow1 (&format_obstack, "%6d", table_data[i]);          \
+      if (table_data[i] < min)                                         \
+       min = table_data[i];                                            \
+      if (max < table_data[i])                                         \
+       max = table_data[i];                                            \
+    }                                                                  \
+  obstack_1grow (&format_obstack, 0);                                  \
+  muscle_insert (name, obstack_finish (&format_obstack));              \
+                                                                       \
+  lmin = min;                                                          \
+  lmax = max;                                                          \
+  /* Build `NAME_min' and `NAME_max' in the obstack. */                        \
+  obstack_fgrow1 (&format_obstack, "%s_min", name);                    \
+  obstack_1grow (&format_obstack, 0);                                  \
+  MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmin);     \
+  obstack_fgrow1 (&format_obstack, "%s_max", name);                    \
+  obstack_1grow (&format_obstack, 0);                                  \
+  MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmax);     \

 }
 
 }
 

+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_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_item_number_table, item_number)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)

 
 

-void
-output_trailers()
-{
-  if (semantic_parser)
-      fprintf(fguard, "\n    }\n}\n");
-
-  fprintf(faction, "\n");
-  
-  if (noparserflag) 
-      return;
-
-  if (semantic_parser)
-      fprintf(faction, "    }\n");
-  fprintf(faction, "}\n");
-}

 
 

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

 
 

-void
-output()
+static void
+escaped_output (FILE *out, char const *string)

 {
 {

-  int c;
-
-  /* output_token_defines(ftable);     / * JF put out token defines FIRST */
-  if (!semantic_parser)                /* JF Put out other stuff */
-    {
-      rewind(fattrs);
-      while ((c=getc(fattrs))!=EOF)
-        putc(c,ftable);
-    }
-  reader_output_yylsp(ftable);
-  if (debugflag)
-    fprintf(ftable, "#ifndef YYDEBUG\n#define YYDEBUG %d\n#endif\n\n",
-           !!debugflag);
-
-  if (semantic_parser)
-    fprintf(ftable, "#include \"%s\"\n", attrsfile);
-
-  if (! noparserflag)
-    fprintf(ftable, "#include <stdio.h>\n\n");
-
-  /* Make "const" do nothing if not in ANSI C.  */
-  fprintf (ftable, "#ifndef __cplusplus\n#ifndef __STDC__\n#define const\n#endif\n#endif\n\n");
-
-  free_itemsets();
-  output_defines();
-  output_token_translations();
-/*   if (semantic_parser) */
-  /* This is now unconditional because debugging printouts can use it.  */
-  output_gram();
-  FREE(ritem);
-  if (semantic_parser)
-    output_stos();
-  output_rule_data();
-  output_actions();
-  if (! noparserflag)
-    output_parser();
-  output_program();
-}
+  char const *p;
+  fprintf (out, "[[");

 
 

+  for (p = quotearg_style (c_quoting_style, string); *p; p++)
+    switch (*p)
+      {
+      case '$': fputs ("$][", out); break;
+      case '@': fputs ("@@",  out); break;
+      case '[': fputs ("@{",  out); break;
+      case ']': fputs ("@}",  out); break;
+      default: fputc (*p, out); break;
+      }

 
 

-void
-output_token_translations()
-{
-  register int i, j;
-/*   register short *sp; JF unused */
-
-  if (translations)
-    {
-      fprintf(ftable,
-             "\n#define YYTRANSLATE(x) ((unsigned)(x) <= %d ? yytranslate[x] : %d)\n",
-             max_user_token_number, nsyms);
-    
-      if (ntokens < 127)  /* play it very safe; check maximum element value.  */
-        fprintf(ftable, "\nstatic const char yytranslate[] = {     0");
-      else
-       fprintf(ftable, "\nstatic const short yytranslate[] = {     0");
-    
-      j = 10;
-      for (i = 1; i <= max_user_token_number; i++)
-       {
-         putc(',', ftable);
-    
-         if (j >= 10)
-           {
-             putc('\n', ftable);
-             j = 1;
-           }
-         else
-           {
-             j++;
-           }
-    
-         fprintf(ftable, "%6d", token_translations[i]);
-       }
-    
-      fprintf(ftable, "\n};\n");
-    }
-  else
-    {
-      fprintf(ftable, "\n#define YYTRANSLATE(x) (x)\n");
-    } 
+  fprintf (out, "]]");

 }
 
 
 }
 
 

-void
-output_gram()
-{
-  register int i;
-  register int j;
-  register short *sp;
-
-  /* With the ordinary parser, 
-     yyprhs and yyrhs are needed only for yydebug. */
-  /* With the noparser option, all tables are generated */
-  if (! semantic_parser  && ! noparserflag)
-    fprintf(ftable, "\n#if YYDEBUG != 0");
-
-  fprintf(ftable, "\nstatic const short yyprhs[] = {     0");
-
-  j = 10;
-  for (i = 1; i <= nrules; i++)
-    {
-      putc(',', ftable);
+/*------------------------------------------------------------------.
+| Prepare the muscles related to the symbols: translate, tname, and |
+| toknum.                                                           |
+`------------------------------------------------------------------*/

 
 

-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", rrhs[i]);
-    }
-
-  fprintf(ftable, "\n};\n");
-
-  fprintf(ftable, "\nstatic const short yyrhs[] = {%6d", ritem[0]);
-
-  j = 10;
-  for (sp = ritem + 1; *sp; sp++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      if (*sp > 0)
-       fprintf(ftable, "%6d", *sp);
-      else
-       fprintf(ftable, "     0");
-    }
-
-  fprintf(ftable, "\n};\n");
-
-  if (! semantic_parser  && ! noparserflag)
-    fprintf(ftable, "\n#endif\n");
-}
-
-
-void
-output_stos()
+static void
+prepare_symbols (void)

 {
 {

-  register int i;
-  register int j;
-
-  fprintf(ftable, "\nstatic const short yystos[] = {     0");
-
-  j = 10;
-  for (i = 1; i < nstates; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", accessing_symbol[i]);
-    }
-
-  fprintf(ftable, "\n};\n");
-}
-
-
-void
-output_rule_data()
-{
-  register int i;
-  register int j;
-
-  fprintf(ftable, "\n#if YYDEBUG != 0\n");
-  fprintf(ftable, "static const short yyrline[] = { 0");
-
-  j = 10;
-  for (i = 1; i <= nrules; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", rline[i]);
-    }
-  fprintf(ftable, "\n};\n#endif\n\n");
-
-  if (toknumflag || noparserflag)
-    {
-      fprintf(ftable, "#define YYNTOKENS %d\n", ntokens);
-      fprintf(ftable, "#define YYNNTS %d\n", nvars);
-      fprintf(ftable, "#define YYNRULES %d\n", nrules);
-      fprintf(ftable, "#define YYNSTATES %d\n", nstates);
-      fprintf(ftable, "#define YYMAXUTOK %d\n\n", max_user_token_number);
-    }
-
-  if (! toknumflag  && ! noparserflag)
-    fprintf(ftable, "\n#if YYDEBUG != 0 || defined (YYERROR_VERBOSE)\n\n");
-
-  /* Output the table of symbol names.  */
-
-  fprintf(ftable,
-          "static const char * const yytname[] = {   \"%s\"",
-          tags[0]);
-
-  j = strlen (tags[0]) + 44;
-  for (i = 1; i < nsyms; i++)
-               /* this used to be i<=nsyms, but that output a final "" symbol
-                       almost by accident */
-    {
-      register char *p;
-      putc(',', ftable);
-      j++;
-
-      if (j > 75)
-       {
-         putc('\n', ftable);
-         j = 0;
-       }
-
-      putc ('\"', ftable);
-      j++;
-
-      for (p = tags[i]; p && *p; p++)
-       {
-         if (*p == '"' || *p == '\\')
-           {
-             fprintf(ftable, "\\%c", *p);
-             j += 2;
-           }
-         else if (*p == '\n')
-           {
-             fprintf(ftable, "\\n");
-             j += 2;
-           }
-         else if (*p == '\t')
-           {
-             fprintf(ftable, "\\t");
-             j += 2;
-           }
-         else if (*p == '\b')
-           {
-             fprintf(ftable, "\\b");
-             j += 2;
-           }
-         else if (*p < 040 || *p >= 0177)
-           {
-             fprintf(ftable, "\\%03o", *p);
-             j += 4;
-           }
-         else
-           {
-             putc(*p, ftable);
-             j++;
-           }
-       }
-
-      putc ('\"', ftable);
-      j++;
-    }
-    fprintf(ftable, ", NULL\n};\n");   /* add a NULL entry to list of tokens */
+  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 ("user_token_number_max", max_user_token_number);
+
+  muscle_insert_symbol_number_table ("translate",
+                                    token_translations,
+                                    token_translations[0],
+                                    1, max_user_token_number + 1);
+
+  /* tname -- token names.  */
+  {
+    int i;
+    /* We assume that the table will be output starting at column 2. */
+    int j = 2;
+    for (i = 0; i < nsyms; i++)
+      {
+       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;

 
 

-  if (! toknumflag  && ! noparserflag)
-    fprintf(ftable, "#endif\n\n");
+       if (j + width > 75)
+         {
+           obstack_sgrow (&format_obstack, "\n ");
+           j = 1;
+         }

 
 

-  if (toknumflag) 
-    {
-      fprintf(ftable, "static const short yytoknum[] = { 0");
-      j = 10;
-      for (i = 1; i <= ntokens; i++) {
-          putc(',', ftable);
-          if (j >= 10) 
-            {
-              putc('\n', ftable);
-              j = 1;
-            }
-          else
-            j++;
-          fprintf(ftable, "%6d", user_toknums[i]);
+       if (i)
+         obstack_1grow (&format_obstack, ' ');
+       MUSCLE_OBSTACK_SGROW (&format_obstack, cp);
+       obstack_1grow (&format_obstack, ',');
+       j += width;

       }
       }

-      fprintf(ftable, "\n};\n\n");
-    }
-
-  fprintf(ftable, "static const short yyr1[] = {     0");
-
-  j = 10;
-  for (i = 1; i <= nrules; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", rlhs[i]);
-    }
-
-  FREE(rlhs + 1);
-
-  fprintf(ftable, "\n};\n\nstatic const short yyr2[] = {     0");
-
-  j = 10;
-  for (i = 1; i < nrules; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", rrhs[i + 1] - rrhs[i] - 1);
-    }
-
-  putc(',', ftable);
-  if (j >= 10)
-    putc('\n', ftable);
-
-  fprintf(ftable, "%6d\n};\n", nitems - rrhs[nrules] - 1);
-  FREE(rrhs + 1);
-}
+    obstack_sgrow (&format_obstack, " ]b4_null[");

 
 

+    /* Finish table and store. */
+    obstack_1grow (&format_obstack, 0);
+    muscle_insert ("tname", obstack_finish (&format_obstack));
+  }

 
 

-void
-output_defines()
-{
-  fprintf(ftable, "\n\n#define\tYYFINAL\t\t%d\n", final_state);
-  fprintf(ftable, "#define\tYYFLAG\t\t%d\n", MINSHORT);
-  fprintf(ftable, "#define\tYYNTBASE\t%d\n", ntokens);
+  /* Output YYTOKNUM. */
+  {
+    int i;
+    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,
+                            values[0], 1, ntokens);
+    free (values);
+  }

 }
 
 
 }
 
 

+/*-------------------------------------------------------------.
+| Prepare the muscles related to the rules: rhs, prhs, r1, r2, |
+| rline, dprec, merger.                                        |
+`-------------------------------------------------------------*/

 
 

-/* compute and output yydefact, yydefgoto, yypact, yypgoto, yytable and yycheck.  */
-
-void
-output_actions()
+static void
+prepare_rules (void)

 {
 {

-  nvectors = nstates + nvars;
-
-  froms = NEW2(nvectors, short *);
-  tos = NEW2(nvectors, short *);
-  tally = NEW2(nvectors, short);
-  width = NEW2(nvectors, short);
-
-  token_actions();
-  free_shifts();
-  free_reductions();
-  FREE(lookaheads);
-  FREE(LA);
-  FREE(LAruleno);
-  FREE(accessing_symbol);
-
-  goto_actions();
-  FREE(goto_map + ntokens);
-  FREE(from_state);
-  FREE(to_state);
-
-  sort_actions();
-  pack_table();
-  output_base();
-  output_table();
-  output_check();
+  rule_number r;
+  unsigned int i = 0;
+  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)
+    {
+      item_number *rhsp = NULL;
+      /* Index of rule R in RHS. */
+      prhs[r] = i;
+      /* RHS of the rule R. */
+      for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
+       rhs[i++] = *rhsp;
+      /* LHS of the rule R. */
+      r1[r] = rules[r].lhs->number;
+      /* Length of rule R's RHS. */
+      r2[r] = i - prhs[r];
+      /* Separator in RHS. */
+      rhs[i++] = -1;
+      /* Line where rule was defined. */
+      rline[r] = rules[r].location.start.line;
+      /* Dynamic precedence (GLR).  */
+      dprec[r] = rules[r].dprec;
+      /* Merger-function index (GLR).  */
+      merger[r] = rules[r].merger;
+    }
+  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_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);
+
+  free (rhs);
+  free (prhs);
+  free (rline);
+  free (r1);
+  free (r2);
+  free (dprec);
+  free (merger);

 }
 
 }
 

+/*--------------------------------------------.
+| Prepare the muscles related to the states.  |
+`--------------------------------------------*/

 
 

-
-/* figure out the actions for the specified state, indexed by lookahead token type.
-
-   The yydefact table is output now.  The detailed info
-   is saved for putting into yytable later.  */
-
-void
-token_actions()
+static void
+prepare_states (void)

 {
 {

-  register int i;
-  register int j;
-  register int k;
-
-  actrow = NEW2(ntokens, short);
-
-  k = action_row(0);
-  fprintf(ftable, "\nstatic const short yydefact[] = {%6d", k);
-  save_row(0);
-
-  j = 10;
-  for (i = 1; i < nstates; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      k = action_row(i);
-      fprintf(ftable, "%6d", k);
-      save_row(i);
-    }
-
-  fprintf(ftable, "\n};\n");
-  FREE(actrow);
+  state_number i;
+  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,
+                                    0, 1, nstates);
+  free (values);
+
+  MUSCLE_INSERT_INT ("last", high);
+  MUSCLE_INSERT_INT ("final_state_number", final_state->number);
+  MUSCLE_INSERT_INT ("states_number", nstates);

 }
 
 
 
 }
 
 
 

-/* Decide what to do for each type of token if seen as the lookahead token in specified state.
-   The value returned is used as the default action (yydefact) for the state.
-   In addition, actrow is filled with what to do for each kind of token,
-   index by symbol number, with zero meaning do the default action.
-   The value MINSHORT, a very negative number, means this situation
-   is an error.  The parser recognizes this value specially.
-
-   This is where conflicts are resolved.  The loop over lookahead rules
-   considered lower-numbered rules last, and the last rule considered that likes
-   a token gets to handle it.  */
+/*---------------------------------.
+| Output the user actions to OUT.  |
+`---------------------------------*/

 
 

-int
-action_row(state)
-int state;
+static void
+user_actions_output (FILE *out)

 {
 {

-  register int i;
-  register int j;
-  register int k;
-  register int m;
-  register int n;
-  register int count;
-  register int default_rule;
-  register int nreds;
-  register int max;
-  register int rule;
-  register int shift_state;
-  register int symbol;
-  register unsigned mask;
-  register unsigned *wordp;
-  register reductions *redp;
-  register shifts *shiftp;
-  register errs *errp;
-  int nodefault = 0;  /* set nonzero to inhibit having any default reduction */
-
-  for (i = 0; i < ntokens; i++)
-    actrow[i] = 0;
-
-  default_rule = 0;
-  nreds = 0;
-  redp = reduction_table[state];
-
-  if (redp)
-    {
-      nreds = redp->nreds;
-
-      if (nreds >= 1)
-       {
-         /* loop over all the rules available here which require lookahead */
-         m = lookaheads[state];
-         n = lookaheads[state + 1];
-
-         for (i = n - 1; i >= m; i--)
-           {
-             rule = - LAruleno[i];
-             wordp = LA + i * tokensetsize;
-             mask = 1;
-
-             /* and find each token which the rule finds acceptable to come next */
-             for (j = 0; j < ntokens; j++)
-               {
-                 /* and record this rule as the rule to use if that token follows.  */
-                 if (mask & *wordp)
-                   actrow[j] = rule;
-
-                 mask <<= 1;
-                 if (mask == 0)
-                   {
-                     mask = 1;
-                     wordp++;
-                   }
-               }
-           }
-       }
-    }
-
-  shiftp = shift_table[state];
-
-  /* now see which tokens are allowed for shifts in this state.
-     For them, record the shift as the thing to do.  So shift is preferred to reduce.  */
-
-  if (shiftp)
-    {
-      k = shiftp->nshifts;
+  rule_number r;

 
 

-      for (i = 0; i < k; i++)
-       {
-         shift_state = shiftp->shifts[i];
-         if (! shift_state) continue;
-
-         symbol = accessing_symbol[shift_state];
-
-         if (ISVAR(symbol))
-           break;
-
-         actrow[symbol] = shift_state;
-
-         /* do not use any default reduction if there is a shift for error */
-
-         if (symbol == error_token_number) nodefault = 1;
-       }
-    }
-
-  errp = err_table[state];
-
-  /* See which tokens are an explicit error in this state
-     (due to %nonassoc).  For them, record MINSHORT as the action.  */
-
-  if (errp)
-    {
-      k = errp->nerrs;
-
-      for (i = 0; i < k; i++)
-       {
-         symbol = errp->errs[i];
-         actrow[symbol] = MINSHORT;
-       }
-    }
-
-  /* now find the most common reduction and make it the default action for this state.  */
-
-  if (nreds >= 1 && ! nodefault)
-    {
-      if (consistent[state])
-       default_rule = redp->rules[0];
-      else
-       {
-         max = 0;
-         for (i = m; i < n; i++)
-           {
-             count = 0;
-             rule = - LAruleno[i];
-    
-             for (j = 0; j < ntokens; j++)
-               {
-                 if (actrow[j] == rule)
-                   count++;
-               }
-    
-             if (count > max)
-               {
-                 max = count;
-                 default_rule = rule;
-               }
-           }
-    
-         /* actions which match the default are replaced with zero,
-            which means "use the default" */
-    
-         if (max > 0)
-           {
-             for (j = 0; j < ntokens; j++)
-               {
-                 if (actrow[j] == default_rule)
-                   actrow[j] = 0;
-               }
-    
-             default_rule = - default_rule;
-           }
-       }
-    }
-
-  /* If have no default rule, the default is an error.
-     So replace any action which says "error" with "use default".  */
-
-  if (default_rule == 0)
-    for (j = 0; j < ntokens; j++)
+  fputs ("m4_define([b4_actions], \n[", out);
+  for (r = 0; r < nrules; ++r)
+    if (rules[r].action)

       {
       {

-       if (actrow[j] == MINSHORT)
-         actrow[j] = 0;
+       fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,
+                rules[r].action_location.start.line);
+       escaped_output (out, rules[r].action_location.start.file);
+       fprintf (out, ")\n[    %s]])\n\n", rules[r].action);

       }
       }

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

 }
 
 }
 

+/*--------------------------------------.
+| Output the merge functions to OUT.   |
+`--------------------------------------*/

 
 

-void
-save_row(state)
-int state;
+static void
+merger_output (FILE *out)

 {
 {

-  register int i;
-  register int count;
-  register short *sp;
-  register short *sp1;
-  register short *sp2;
-
-  count = 0;
-  for (i = 0; i < ntokens; i++)
-    {
-      if (actrow[i] != 0)
-       count++;
-    }
-
-  if (count == 0)
-    return;
+  int n;
+  merger_list* p;

 
 

-  froms[state] = sp1 = sp = NEW2(count, short);
-  tos[state] = sp2 = NEW2(count, short);
-
-  for (i = 0; i < ntokens; i++)
+  fputs ("m4_define([b4_mergers], \n[[", out);
+  for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next)

     {
     {

-      if (actrow[i] != 0)
-       {
-         *sp1++ = i;
-         *sp2++ = actrow[i];
-       }
-    }
-
-  tally[state] = count;
-  width[state] = sp1[-1] - sp[0] + 1;
-}
-
-
-
-/* figure out what to do after reducing with each rule,
-   depending on the saved state from before the beginning
-   of parsing the data that matched this rule.
-
-   The yydefgoto table is output now.  The detailed info
-   is saved for putting into yytable later.  */
-
-void
-goto_actions()
-{
-  register int i;
-  register int j;
-  register int k;
-
-  state_count = NEW2(nstates, short);
-
-  k = default_goto(ntokens);
-  fprintf(ftable, "\nstatic const short yydefgoto[] = {%6d", k);
-  save_column(ntokens, k);
-
-  j = 10;
-  for (i = ntokens + 1; i < nsyms; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
+      if (p->type[0] == '\0')
+       fprintf (out, "  case %d: *yy0 = %s (*yy0, *yy1); break;\n",
+                n, p->name);

       else
       else

-       {
-         j++;
-       }
-
-      k = default_goto(i);
-      fprintf(ftable, "%6d", k);
-      save_column(i, k);
+       fprintf (out, "  case %d: yy0->%s = %s (*yy0, *yy1); break;\n",
+                n, p->type, p->name);

     }
     }

-
-  fprintf(ftable, "\n};\n");
-  FREE(state_count);
+  fputs ("]])\n\n", out);

 }
 
 }
 

+/*--------------------------------------.
+| Output the tokens definition to OUT.  |
+`--------------------------------------*/

 
 

-
-int
-default_goto(symbol)
-int symbol;
+static void
+token_definitions_output (FILE *out)

 {
 {

-  register int i;
-  register int m;
-  register int n;
-  register int default_state;
-  register int max;
-
-  m = goto_map[symbol];
-  n = goto_map[symbol + 1];
-
-  if (m == n)
-    return (-1);
-
-  for (i = 0; i < nstates; i++)
-    state_count[i] = 0;
-
-  for (i = m; i < n; i++)
-    state_count[to_state[i]]++;
-
-  max = 0;
-  default_state = -1;
-
-  for (i = 0; i < nstates; i++)
-    {
-      if (state_count[i] > max)
-       {
-         max = state_count[i];
-         default_state = i;
-       }
-    }
-
-  return (default_state);
-}
-
-
-void
-save_column(symbol, default_state)
-int symbol;
-int default_state;
-{
-  register int i;
-  register int m;
-  register int n;
-  register short *sp;
-  register short *sp1;
-  register short *sp2;
-  register int count;
-  register int symno;
-
-  m = goto_map[symbol];
-  n = goto_map[symbol + 1];
-
-  count = 0;
-  for (i = m; i < n; i++)
-    {
-      if (to_state[i] != default_state)
-       count++;
-    }
-
-  if (count == 0)
-    return;
-
-  symno = symbol - ntokens + nstates;
-
-  froms[symno] = sp1 = sp = NEW2(count, short);
-  tos[symno] = sp2 = NEW2(count, short);
-
-  for (i = m; i < n; i++)
-    {
-      if (to_state[i] != default_state)
-       {
-         *sp1++ = from_state[i];
-         *sp2++ = to_state[i];
-       }
-    }
-
-  tally[symno] = count;
-  width[symno] = sp1[-1] - sp[0] + 1;
-}
-
-
-
-/* the next few functions decide how to pack 
-   the actions and gotos information into yytable. */
-
-void
-sort_actions()
-{
-  register int i;
-  register int j;
-  register int k;
-  register int t;
-  register int w;
-
-  order = NEW2(nvectors, short);
-  nentries = 0;
-
-  for (i = 0; i < nvectors; i++)
-    {
-      if (tally[i] > 0)
-       {
-         t = tally[i];
-         w = width[i];
-         j = nentries - 1;
-
-         while (j >= 0 && (width[order[j]] < w))
-           j--;
-
-         while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
-           j--;
-
-         for (k = nentries - 1; k > j; k--)
-           order[k + 1] = order[k];
-
-         order[j + 1] = i;
-         nentries++;
-       }
-    }
-}
-
-
-void
-pack_table()
-{
-  register int i;
-  register int place;
-  register int state;
-
-  base = NEW2(nvectors, short);
-  pos = NEW2(nentries, short);
-  table = NEW2(MAXTABLE, short);
-  check = NEW2(MAXTABLE, short);
-
-  lowzero = 0;
-  high = 0;
-
-  for (i = 0; i < nvectors; i++)
-    base[i] = MINSHORT;
-
-  for (i = 0; i < MAXTABLE; i++)
-    check[i] = -1;
-
-  for (i = 0; i < nentries; i++)
-    {
-      state = matching_state(i);
-
-      if (state < 0)
-       place = pack_vector(i);
-      else
-       place = base[state];
-
-      pos[i] = place;
-      base[order[i]] = place;
-    }
+  int i;
+  char const *sep = "";

 
 

-  for (i = 0; i < nvectors; i++)
+  fputs ("m4_define([b4_tokens], \n[", out);
+  for (i = 0; i < ntokens; ++i)

     {
     {

-      if (froms[i])
-       FREE(froms[i]);
-      if (tos[i])
-       FREE(tos[i]);
-    }
-
-  FREE(froms);
-  FREE(tos);
-  FREE(pos);
-}
-
-
-
-int
-matching_state(vector)
-int vector;
-{
-  register int i;
-  register int j;
-  register int k;
-  register int t;
-  register int w;
-  register int match;
-  register int prev;
-
-  i = order[vector];
-  if (i >= nstates)
-    return (-1);
-
-  t = tally[i];
-  w = width[i];
-
-  for (prev = vector - 1; prev >= 0; prev--)
-    {
-      j = order[prev];
-      if (width[j] != w || tally[j] != t)
-       return (-1);
-
-      match = 1;
-      for (k = 0; match && k < t; k++)
-       {
-         if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k])
-           match = 0;
-       }
-
-      if (match)
-       return (j);
-    }
-
-  return (-1);
-}
-
+      symbol *sym = symbols[i];
+      int number = sym->user_token_number;

 
 

+      /* At this stage, if there are literal aliases, they are part of
+        SYMBOLS, so we should not find symbols which are the aliases
+        here.  */
+      aver (number != USER_NUMBER_ALIAS);

 
 

-int
-pack_vector(vector)
-int vector;
-{
-  register int i;
-  register int j;
-  register int k;
-  register int t;
-  register int loc;
-  register int ok;
-  register short *from;
-  register short *to;
+      /* Skip error token.  */
+      if (sym == errtoken)
+       continue;

 
 

-  i = order[vector];
-  t = tally[i];
+      /* If this string has an alias, then it is necessarily the alias
+        which is to be output.  */
+      if (sym->alias)
+       sym = sym->alias;

 
 

-  if (t == 0)
-    berror("pack_vector");
+      /* Don't output literal chars or strings (when defined only as a
+        string).  Note that must be done after the alias resolution:
+        think about `%token 'f' "f"'.  */
+      if (sym->tag[0] == '\'' || sym->tag[0] == '\"')
+       continue;

 
 

-  from = froms[i];
-  to = tos[i];
+      /* Don't #define nonliteral tokens whose names contain periods
+        or '$' (as does the default value of the EOF token).  */
+      if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))
+       continue;

 
 

-  for (j = lowzero - from[0]; j < MAXTABLE; j++)
-    {
-      ok = 1;
-
-      for (k = 0; ok && k < t; k++)
-       {
-         loc = j + from[k];
-         if (loc > MAXTABLE)
-           fatals("maximum table size (%s) exceeded", int_to_string(MAXTABLE));
-
-         if (table[loc] != 0)
-           ok = 0;
-       }
-
-      for (k = 0; ok && k < vector; k++)
-       {
-         if (pos[k] == j)
-           ok = 0;
-       }
-
-      if (ok)
-       {
-         for (k = 0; k < t; k++)
-           {
-             loc = j + from[k];
-             table[loc] = to[k];
-             check[loc] = from[k];
-           }
-
-         while (table[lowzero] != 0)
-           lowzero++;
-
-         if (loc > high)
-           high = loc;
-
-         return (j);
-       }
+      fprintf (out, "%s[[[%s]], %d]",
+              sep, sym->tag, number);
+      sep = ",\n";

     }
     }

-
-  berror("pack_vector");
-  return 0;    /* JF keep lint happy */
+  fputs ("])\n\n", out);

 }
 
 
 }
 
 

+/*---------------------------------------------------.
+| Output the symbol destructors or printers to OUT.  |
+`---------------------------------------------------*/

 
 

-/* the following functions output yytable, yycheck
-   and the vectors whose elements index the portion starts */
-
-void
-output_base()
+static void
+symbol_code_props_output (FILE *out, char const *what,
+                          code_props const *(*get)(symbol const *))

 {
 {

-  register int i;
-  register int j;
-
-  fprintf(ftable, "\nstatic const short yypact[] = {%6d", base[0]);
-
-  j = 10;
-  for (i = 1; i < nstates; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", base[i]);
-    }
-
-  fprintf(ftable, "\n};\n\nstatic const short yypgoto[] = {%6d", base[nstates]);
-
-  j = 10;
-  for (i = nstates + 1; i < nvectors; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", base[i]);
-    }
-
-  fprintf(ftable, "\n};\n");
-  FREE(base);
+  int i;
+  char const *sep = "";
+
+  fputs ("m4_define([b4_symbol_", out);
+  fputs (what, out);
+  fputs ("], \n[", out);
+  for (i = 0; i < nsyms; ++i)
+    {
+      symbol *sym = symbols[i];
+      char const *code = (*get) (sym)->code;
+      if (code)
+        {
+          location loc = (*get) (sym)->location;
+          /* Filename, lineno,
+             Symbol-name, Symbol-number,
+             code, optional typename.  */
+          fprintf (out, "%s[", sep);
+          sep = ",\n";
+          escaped_output (out, loc.start.file);
+          fprintf (out, ", %d, ", loc.start.line);
+          escaped_output (out, sym->tag);
+          fprintf (out, ", %d, [[%s]]", sym->number, code);
+          if (sym->type_name)
+            fprintf (out, ", [[%s]]", sym->type_name);
+          fputc (']', out);
+        }
+    }
+  fputs ("])\n\n", out);

 }
 
 
 }
 
 

-void
-output_table()
+static void
+prepare_actions (void)

 {
 {

-  register int i;
-  register int j;
-
-  fprintf(ftable, "\n\n#define\tYYLAST\t\t%d\n\n", high);
-  fprintf(ftable, "\nstatic const short yytable[] = {%6d", table[0]);
-
-  j = 10;
-  for (i = 1; i <= high; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", table[i]);
-    }
-
-  fprintf(ftable, "\n};\n");
-  FREE(table);
+  /* Figure out the actions for the specified state, indexed by
+     lookahead token type.  */
+
+  muscle_insert_rule_number_table ("defact", yydefact,
+                                  yydefact[0], 1, nstates);
+
+  /* Figure out what to do after reducing with each rule, depending on
+     the saved state from before the beginning of parsing the data
+     that matched this rule.  */
+  muscle_insert_state_number_table ("defgoto", yydefgoto,
+                                   yydefgoto[0], 1, nsyms - ntokens);
+
+
+  /* Output PACT. */
+  muscle_insert_base_table ("pact", base,
+                            base[0], 1, nstates);
+  MUSCLE_INSERT_INT ("pact_ninf", base_ninf);
+
+  /* Output PGOTO. */
+  muscle_insert_base_table ("pgoto", base,
+                            base[nstates], nstates + 1, nvectors);
+
+  muscle_insert_base_table ("table", table,
+                           table[0], 1, high + 1);
+  MUSCLE_INSERT_INT ("table_ninf", table_ninf);
+
+  muscle_insert_base_table ("check", check,
+                           check[0], 1, high + 1);
+
+  /* GLR parsing slightly modifies YYTABLE and YYCHECK (and thus
+     YYPACT) so that in states with unresolved conflicts, the default
+     reduction is not used in the conflicted entries, so that there is
+     a place to put a conflict pointer.
+
+     This means that YYCONFLP and YYCONFL are nonsense for a non-GLR
+     parser, so we could avoid accidents by not writing them out in
+     that case.  Nevertheless, it seems even better to be able to use
+     the GLR skeletons even without the non-deterministic tables.  */
+  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,
+                                   0, 1, conflict_list_cnt);

 }
 
 }
 

+\f
+/*---------------------------.
+| Call the skeleton parser.  |
+`---------------------------*/

 
 

-void
-output_check()
+static void
+output_skeleton (void)

 {
 {

-  register int i;
-  register int j;
-
-  fprintf(ftable, "\nstatic const short yycheck[] = {%6d", check[0]);
-
-  j = 10;
-  for (i = 1; i <= high; i++)
-    {
-      putc(',', ftable);
-
-      if (j >= 10)
-       {
-         putc('\n', ftable);
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      fprintf(ftable, "%6d", check[i]);
-    }
-
-  fprintf(ftable, "\n};\n");
-  FREE(check);
+  FILE *in;
+  FILE *out;
+  int filter_fd[2];
+  char const *argv[7];
+  pid_t pid;
+
+  /* Compute the names of the package data dir and skeleton file.
+     Test whether m4sugar.m4 is readable, to check for proper
+     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_m4bison;
+  char *full_skeleton;
+  char const *p;
+  char const *m4 = (p = getenv ("M4")) ? p : M4;
+  char const *pkgdatadir = compute_pkgdatadir ();
+  size_t skeleton_size = strlen (skeleton) + 1;
+  size_t pkgdatadirlen = strlen (pkgdatadir);
+  while (pkgdatadirlen && pkgdatadir[pkgdatadirlen - 1] == '/')
+    pkgdatadirlen--;
+  full_skeleton = xmalloc (pkgdatadirlen + 1
+                          + (skeleton_size < sizeof m4sugar
+                             ? sizeof m4sugar : skeleton_size));
+  strncpy (full_skeleton, pkgdatadir, pkgdatadirlen);
+  full_skeleton[pkgdatadirlen] = '/';
+  strcpy (full_skeleton + pkgdatadirlen + 1, m4sugar);
+  full_m4sugar = xstrdup (full_skeleton);
+  strcpy (full_skeleton + pkgdatadirlen + 1, m4bison);
+  full_m4bison = xstrdup (full_skeleton);
+  if (strchr (skeleton, '/'))
+    strcpy (full_skeleton, skeleton);
+  else
+    strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);
+  xfclose (xfopen (full_m4sugar, "r"));
+
+  /* Create an m4 subprocess connected to us via two pipes.  */
+
+  if (trace_flag & trace_tools)
+    fprintf (stderr, "running: %s %s - %s %s\n",
+            m4, full_m4sugar, full_m4bison, full_skeleton);
+
+  argv[0] = m4;
+  argv[1] = full_m4sugar;
+  argv[2] = "-";
+  argv[3] = full_m4bison;
+  argv[4] = full_skeleton;
+  argv[5] = trace_flag & trace_m4 ? "-dV" : NULL;
+  argv[6] = NULL;
+
+  init_subpipe ();
+  pid = create_subpipe (argv, filter_fd);
+  free (full_m4bison);
+  free (full_m4sugar);
+  free (full_skeleton);
+
+  out = fdopen (filter_fd[0], "w");
+  if (! out)
+    error (EXIT_FAILURE, get_errno (),
+          "fdopen");
+
+  /* Output the definitions of all the muscles.  */
+  fputs ("m4_init()\n", out);
+
+  user_actions_output (out);
+  merger_output (out);
+  token_definitions_output (out);
+  symbol_code_props_output (out, "destructors", &symbol_destructor_get);
+  symbol_code_props_output (out, "printers", &symbol_printer_get);
+
+  muscles_m4_output (out);
+  xfclose (out);
+
+  /* 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)
+    error (EXIT_FAILURE, get_errno (),
+          "fdopen");
+  scan_skel (in);
+  xfclose (in);
+  reap_subpipe (pid, m4);
+  timevar_pop (TV_M4);

 }
 
 }
 

-
-
-/* copy the parser code into the ftable file at the end.  */
-
-void
-output_parser()
+static void
+prepare (void)

 {
 {

-  register int c;
-#ifdef DONTDEF
-  FILE *fpars;
-#else
-#define fpars fparser
-#endif
-
-  if (pure_parser)
-    fprintf(ftable, "#define YYPURE 1\n\n");
-
-#ifdef DONTDEF /* JF no longer needed 'cuz open_extra_files changes the
-                  currently open parser from bison.simple to bison.hairy */
-  if (semantic_parser)
-    fpars = fparser;
-  else fpars = fparser1;
-#endif
-
-  /* Loop over lines in the standard parser file.  */
-
-  while (1)
-    {
-      int write_line = 1;
-
-      c = getc(fpars);
-
-      /* See if the line starts with `#line.
-        If so, set write_line to 0.  */
-      if (nolinesflag)
-       if (c == '#') 
-         {
-           c = getc(fpars);
-           if (c == 'l')
-             {
-               c = getc(fpars);
-               if (c == 'i')
-                 {
-                   c = getc(fpars);
-                   if (c == 'n')
-                     {
-                       c = getc(fpars);
-                       if (c == 'e')
-                         write_line = 0;
-                       else
-                         fprintf(ftable, "#lin");
-                     }
-                   else
-                     fprintf(ftable, "#li");
-                 }
-               else
-                 fprintf(ftable, "#l");
-             }
-           else
-             fprintf(ftable, "#");
-         }
-
-      /* now write out the line... */
-      for (; c != '\n' && c != EOF; c = getc(fpars))
-       if (write_line)
-         if (c == '$')
-           {
-             /* `$' in the parser file indicates where to put the actions.
-                Copy them in at this point.  */
-             rewind(faction);
-             for(c=getc(faction);c!=EOF;c=getc(faction))
-               putc(c,ftable);
-           }
-         else
-           putc(c, ftable);
-      if (c == EOF)
-       break;
-      putc(c, ftable);
-    }
+  /* BISON_USE_PUSH_FOR_PULL is for the test suite and should not be documented
+     for the user.  */
+  char const *use_push_for_pull_env = getenv ("BISON_USE_PUSH_FOR_PULL");
+  bool use_push_for_pull_flag = false;
+  if (use_push_for_pull_env != NULL
+      && use_push_for_pull_env[0] != '\0'
+      && 0 != strcmp (use_push_for_pull_env, "0"))
+    use_push_for_pull_flag = true;
+
+  /* Flags. */
+  MUSCLE_INSERT_BOOL ("debug_flag", debug_flag);
+  MUSCLE_INSERT_BOOL ("defines_flag", defines_flag);
+  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 ("nondeterministic_flag", nondeterministic_parser);
+  MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
+  MUSCLE_INSERT_BOOL ("tag_seen_flag", tag_seen);
+  MUSCLE_INSERT_BOOL ("use_push_for_pull_flag", use_push_for_pull_flag);
+  MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag);
+
+  /* File names.  */
+  if (spec_name_prefix)
+    MUSCLE_INSERT_STRING ("prefix", spec_name_prefix);
+
+  MUSCLE_INSERT_STRING ("file_name_all_but_ext", all_but_ext);
+
+#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
+
+  /* Find the right skeleton file, and add muscles about the skeletons.  */
+  if (skeleton)
+    MUSCLE_INSERT_C_STRING ("skeleton", skeleton);
+  else
+    skeleton = language->skeleton;
+
+  /* About the skeletons.  */
+  {
+    /* b4_pkgdatadir is used inside m4_include in the skeletons, so digraphs
+       would never be expanded.  Hopefully no one has M4-special characters in
+       his Bison installation path.  */
+    MUSCLE_INSERT_STRING_RAW ("pkgdatadir", compute_pkgdatadir ());
+  }

 }
 
 }
 

-void
-output_program()
-{
-  register int c;
-  extern int lineno;
-
-  if (!nolinesflag)
-    fprintf(ftable, "#line %d \"%s\"\n", lineno, infile);
-
-  c = getc(finput);
-  while (c != EOF)
-    {
-      putc(c, ftable);
-      c = getc(finput);
-    }
-}

 
 

+/*----------------------------------------------------------.
+| Output the parsing tables and the parser code to ftable.  |
+`----------------------------------------------------------*/

 
 void
 
 void

-free_itemsets()
+output (void)

 {
 {

-  register core *cp,*cptmp;
+  obstack_init (&format_obstack);

 
 

-  FREE(state_table);
+  prepare_symbols ();
+  prepare_rules ();
+  prepare_states ();
+  prepare_actions ();

 
 

-  for (cp = first_state; cp; cp = cptmp) {
-    cptmp=cp->next;
-    FREE(cp);
-  }
-}
+  prepare ();

 
 

+  /* Process the selected skeleton file.  */
+  output_skeleton ();

 
 

-void
-free_shifts()
-{
-  register shifts *sp,*sptmp;/* JF derefrenced freed ptr */
-
-  FREE(shift_table);
-
-  for (sp = first_shift; sp; sp = sptmp) {
-    sptmp=sp->next;
-    FREE(sp);
-  }
+  obstack_free (&format_obstack, NULL);

 }
 
 }
 

-
-void
-free_reductions()
+char const *
+compute_pkgdatadir (void)

 {
 {

-  register reductions *rp,*rptmp;/* JF fixed freed ptr */
-
-  FREE(reduction_table);
-
-  for (rp = first_reduction; rp; rp = rptmp) {
-    rptmp=rp->next;
-    FREE(rp);
-  }
+  char const *pkgdatadir = getenv ("BISON_PKGDATADIR");
+  return pkgdatadir ? pkgdatadir : PKGDATADIR;

 }
 }