Regenerate.

[bison.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index a5a0a606ec84bdc0dfa5051fd141f8a165398d7c..55a3d47e5fdce9a9a116515036882f979737de5d 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,5 +1,7 @@
-/* Output the generated parsing program for bison,
-   Copyright 1984, 1986, 1989, 1992, 2000 Free Software Foundation, Inc.
+/* Output the generated parsing program for Bison.
+
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004
+   Free Software Foundation, Inc.

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


@@ -19,1283 +21,606 @@
    02111-1307, USA.  */
 
 
    02111-1307, USA.  */
 
 

-/* 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.
+#include "system.h"

 
 

-   YYFINAL = the state number of the termination state.
-   YYFLAG = most negative short int.  Used to flag ??
-   YYNTBASE = ntokens.
-*/
+#include <error.h>
+#include <get-errno.h>
+#include <quotearg.h>
+#include <subpipe.h>
+#include <timevar.h>

 
 

-#include "system.h"
-#include "obstack.h"
-#include "quotearg.h"
-#include "getargs.h"
-#include "xalloc.h"
+#include "complain.h"

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

+#include "getargs.h"

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

-#include "LR0.h"
-#include "complain.h"
+#include "muscle_tab.h"

 #include "output.h"
 #include "output.h"

-#include "lalr.h"

 #include "reader.h"
 #include "reader.h"

-#include "conflicts.h"
-
-extern void berror PARAMS((const char *));
-
-
-
-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;
-
-
-
-static inline void
-output_short_or_char_table (struct obstack *oout,
-                           const char *comment,
-                           const char *type,
-                           const char *table_name,
-                           short *short_table,
-                           short first_value,
-                           short begin, short end)
-{
-  int i, j;
-
-  if (comment)
-    obstack_fgrow1 (oout, "/* %s. */\n", comment);
-
-  obstack_fgrow3 (oout, "static const %s %s[] =\n{\n  %6d",
-                 type, table_name, first_value);
-
-  j = 1;
-  for (i = begin; i < end; i++)
-    {
-      obstack_1grow (oout, ',');
-
-      if (j >= 10)
-       {
-         obstack_grow_string (oout, "\n  ");
-         j = 1;
-       }
-      else
-       {
-         j++;
-       }
-
-      obstack_fgrow1 (oout, "%6d", short_table[i]);
-    }
+#include "symtab.h"
+#include "tables.h"

 
 

-  obstack_grow_string (oout, "\n};\n");
-}
+/* From src/scan-skel.l. */
+void scan_skel (FILE *);

 
 
 
 

-static inline void
-output_short_table (struct obstack *oout,
-                   const char *comment,
-                   const char *table_name,
-                   short *short_table,
-                   short first_value,
-                   short begin, short end)
-{
-  output_short_or_char_table (oout, comment, "short", table_name, short_table,
-                             first_value, begin, end);
-}
+static struct obstack format_obstack;

 
 

+bool error_verbose = false;

 
 

-/*--------------------------------------------------------------.
-| output_headers -- Output constant strings to the beginning of |
-| certain files.                                                |
-`--------------------------------------------------------------*/
-
-/* Don't put the `%s' insides quotes, since it quotearg puts them. */
-
-#define        GUARDSTR        \
-"\n\
-#include %s\n\
-extern int yyerror;\n\
-extern int yycost;\n\
-extern char * yymsg;\n\
-extern YYSTYPE yyval;\n\
-\n\
-yyguard(n, yyvsp, yylsp)\n\
-register int n;\n\
-register YYSTYPE *yyvsp;\n\
-register YYLTYPE *yylsp;\n\
-{\n\
-  yyerror = 0;\n\
-  yycost = 0;\n\
-  yymsg = 0;\n\
-  switch (n)\n\
-    {"
-
-#define        ACTSTR          \
-"\n\
-#include %s\n\
-extern YYSTYPE yyval;\n\
-extern int yychar;\n\
-\n\
-yyaction(n, yyvsp, yylsp)\n\
-register int n;\n\
-register YYSTYPE *yyvsp;\n\
-register YYLTYPE *yylsp;\n\
-{\n\
-  switch (n)\n\
-    {"
-
-#define        ACTSTR_SIMPLE   "\n  switch (yyn) {\n"

 
 

-void
-output_headers (void)
-{
-  char *attrsfile_quoted = quotearg_style (c_quoting_style, attrsfile);

 
 

-  if (semantic_parser)
-    obstack_fgrow1 (&guard_obstack, GUARDSTR, attrsfile_quoted);
-
-  if (no_parser_flag)
-    return;
+/*-------------------------------------------------------------------.
+| 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.                                                        |
+`-------------------------------------------------------------------*/

 
 

-  if (semantic_parser)
-    obstack_fgrow1 (&action_obstack, ACTSTR, attrsfile_quoted);
-  else
-    obstack_grow_string (&action_obstack, ACTSTR_SIMPLE);

 
 

-  /* Rename certain symbols if -p was specified.  */
-  if (spec_name_prefix)
-    {
-      obstack_fgrow1 (&table_obstack,
-                     "#define yyparse %sparse\n", spec_name_prefix);
-      obstack_fgrow1 (&table_obstack,
-                     "#define yylex %slex\n", spec_name_prefix);
-      obstack_fgrow1 (&table_obstack,
-                     "#define yyerror %serror\n", spec_name_prefix);
-      obstack_fgrow1 (&table_obstack,
-                     "#define yylval %slval\n", spec_name_prefix);
-      obstack_fgrow1 (&table_obstack,
-                     "#define yychar %schar\n", spec_name_prefix);
-      obstack_fgrow1 (&table_obstack,
-                     "#define yydebug %sdebug\n", spec_name_prefix);
-      obstack_fgrow1 (&table_obstack,
-                     "#define yynerrs %snerrs\n", spec_name_prefix);
-    }
+#define GENERATE_MUSCLE_INSERT_TABLE(Name, Type)                       \
+                                                                       \
+static void                                                            \
+Name (const char *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);     \

 }
 
 }
 

-
-/*-------------------------------------------------------.
-| Output constant strings to the ends of certain files.  |
-`-------------------------------------------------------*/
-
-void
-output_trailers (void)
-{
-  if (semantic_parser)
-    obstack_grow_string (&guard_obstack, "\n    }\n}\n");
-
-  obstack_1grow (&action_obstack, '\n');
-
-  if (no_parser_flag)
-    return;
-
-  if (semantic_parser)
-    obstack_grow_string (&action_obstack, "    }\n");
-
-  obstack_grow_string (&action_obstack, "}\n");
-}
+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)

 
 
 
 

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

 
 static void
 
 static void

-output_token_translations (void)
+escaped_file_name_output (FILE *out, char const *filename)

 {
 {

-  obstack_grow_string (&table_obstack, "\
-\n\
-/* YYRANSLATE(YYLEX) -- Bison token number corresponding to YYLEX. */\n");
+  char const *p;
+  fprintf (out, "[[");

 
 

-  if (translations)
-    {
-      obstack_fgrow2 (&table_obstack,
-      "#define YYTRANSLATE(x) ((unsigned)(x) <= %d ? yytranslate[x] : %d)\
-\n\
-\n",
-              max_user_token_number, nsyms);
-
-      output_short_or_char_table (&table_obstack,
-            "YYRANSLATE[YYLEX] -- Bison token number corresponding to YYLEX",
-                   ntokens < 127 ? "char" : "short",
-                   "yytranslate", token_translations,
-                   0, 1, max_user_token_number + 1);
-    }
-  else
-    {
-      obstack_grow_string (&table_obstack,
-                          "\n#define YYTRANSLATE(x) (x)\n");
-    }
+  for (p = quotearg_style (c_quoting_style, filename); *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;
+      }
+
+  fprintf (out, "]]");

 }
 
 
 }
 
 

+/*------------------------------------------------------------------.
+| Prepare the muscles related to the symbols: translate, tname, and |
+| toknum.                                                           |
+`------------------------------------------------------------------*/
+

 static void
 static void

-output_gram (void)
+prepare_symbols (void)

 {
 {

-  /* With the ordinary parser,
-     yyprhs and yyrhs are needed only for yydebug. */
-  /* With the no_parser option, all tables are generated */
-  if (!semantic_parser && !no_parser_flag)
-    obstack_grow_string (&table_obstack, "\n#if YYDEBUG != 0\n");
+  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);

 
 

-  output_short_table (&table_obstack, NULL, "yyprhs", rrhs,
-                     0, 1, nrules + 1);
+  muscle_insert_symbol_number_table ("translate",
+                                    token_translations,
+                                    token_translations[0],
+                                    1, max_user_token_number + 1);

 
 

+  /* tname -- token names.  */

   {
   {

-    size_t yyrhs_size = 1;
-    short *yyrhs, *sp;

     int i;
     int i;

+    /* We assume that the table will be output starting at column 2. */
+    int j = 2;
+    for (i = 0; i < nsyms; i++)
+      {
+       const char *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;

 
 

-    for (sp = ritem + 1; *sp; sp++)
-      ++yyrhs_size;
-    yyrhs = XMALLOC (short, yyrhs_size);
+       if (j + width > 75)
+         {
+           obstack_sgrow (&format_obstack, "\n ");
+           j = 1;
+         }

 
 

-    for (sp = ritem + 1, i = 1; *sp; ++sp, ++i)
-      yyrhs[i] = *sp > 0 ? *sp : 0;
+       if (i)
+         obstack_1grow (&format_obstack, ' ');
+       MUSCLE_OBSTACK_SGROW (&format_obstack, cp);
+       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");

 
 

-    output_short_table (&table_obstack, NULL, "yyrhs", yyrhs,
-                       ritem[0], 1, yyrhs_size);
-    XFREE (yyrhs);
+    /* Finish table and store. */
+    obstack_1grow (&format_obstack, 0);
+    muscle_insert ("tname", obstack_finish (&format_obstack));

   }
 
   }
 

-  if (!semantic_parser && !no_parser_flag)
-    obstack_grow_string (&table_obstack, "\n#endif\n");
-}
-
-
-static void
-output_stos (void)
-{
-  output_short_table (&table_obstack, NULL, "yystos", accessing_symbol,
-                     0, 1, nstates);
-}
-
-
-static void
-output_rule_data (void)
-{
-  int i;
-  int j;
-  short *short_tab = NULL;
-
-  obstack_grow_string (&table_obstack, "\n\
-#if YYDEBUG != 0\n");
-
-  output_short_table (&table_obstack,
-           "YYRLINE[YYN] -- source line where rule number YYN was defined",
-                     "yyrline", rline,
-                     0, 1, nrules + 1);
-
-  obstack_grow_string (&table_obstack, "#endif\n\n");
-
-  if (token_table_flag || no_parser_flag)
-    {
-      obstack_fgrow1 (&table_obstack, "#define YYNTOKENS %d\n", ntokens);
-      obstack_fgrow1 (&table_obstack, "#define YYNNTS %d\n", nvars);
-      obstack_fgrow1 (&table_obstack, "#define YYNRULES %d\n", nrules);
-      obstack_fgrow1 (&table_obstack, "#define YYNSTATES %d\n", nstates);
-      obstack_fgrow1 (&table_obstack, "#define YYMAXUTOK %d\n\n",
-                     max_user_token_number);
-    }
-
-  /* Output the table of symbol names.  */
-  if (!token_table_flag && !no_parser_flag)
-    obstack_grow_string (&table_obstack,
-                        "\n#if YYDEBUG != 0 || defined YYERROR_VERBOSE\n\n");
-  obstack_grow_string (&table_obstack, "\
-/* YYTNAME[TOKEN_NUM] -- String name of the token TOKEN_NUM. */\n");
-  obstack_grow_string (&table_obstack,
-          "static const char *const yytname[] =\n{\n  ");
-
-  j = 0;
-  for (i = 0; i < nsyms; i++)
-    /* this used to be i<=nsyms, but that output a final "" symbol
-       almost by accident */
-    {
-      /* Width of the next token, including the two quotes, the coma
-        and the space.  */
-      int strsize = 4;
-      char *p;
-
-      for (p = tags[i]; p && *p; p++)
-       if (*p == '"' || *p == '\\' || *p == '\n' || *p == '\t'
-           || *p == '\b')
-         strsize += 2;
-       else if (*p < 040 || *p >= 0177)
-         strsize += 4;
-       else
-         strsize++;
-
-      if (j + strsize > 75)
-       {
-         obstack_grow_string (&table_obstack, "\n  ");
-         j = 2;
-       }
-
-      obstack_1grow (&table_obstack, '\"');
-      for (p = tags[i]; p && *p; p++)
-       {
-         if (*p == '"' || *p == '\\')
-           obstack_fgrow1 (&table_obstack, "\\%c", *p);
-         else if (*p == '\n')
-           obstack_grow_string (&table_obstack, "\\n");
-         else if (*p == '\t')
-           obstack_grow_string (&table_obstack, "\\t");
-         else if (*p == '\b')
-           obstack_grow_string (&table_obstack, "\\b");
-         else if (*p < 040 || *p >= 0177)
-           obstack_fgrow1 (&table_obstack, "\\%03o", *p);
-         else
-           obstack_1grow (&table_obstack, *p);
-       }
-
-      obstack_grow_string (&table_obstack, "\", ");
-      j += strsize;
-    }
-  /* add a NULL entry to list of tokens */
-  obstack_grow_string (&table_obstack, "NULL\n};\n");
-
-  if (!token_table_flag && !no_parser_flag)
-    obstack_grow_string (&table_obstack, "#endif\n\n");
-

   /* Output YYTOKNUM. */
   /* Output YYTOKNUM. */

-  if (token_table_flag)
-    {
-      output_short_table (&table_obstack,
-                 "YYTOKNUM[YYLEX] -- Index in YYTNAME corresponding to YYLEX",
-                         "yytoknum", user_toknums,
-                         0, 1, ntokens + 1);
-    }
-
-  /* Output YYR1. */
-  output_short_table (&table_obstack,
-             "YYR1[YYN] -- Symbol number of symbol that rule YYN derives",
-                     "yyr1", rlhs,
-                     0, 1, nrules + 1);
-  XFREE (rlhs + 1);
-
-  obstack_1grow (&table_obstack, '\n');
-
-  /* Output YYR2. */
-  short_tab = XMALLOC (short, nrules + 1);
-  for (i = 1; i < nrules; i++)
-    short_tab[i] = rrhs[i + 1] - rrhs[i] - 1;
-  short_tab[nrules] = nitems - rrhs[nrules] - 1;
-  output_short_table (&table_obstack,
-        "YYR2[YYN] -- Number of symbols composing right hand side of rule YYN",
-                     "yyr2", short_tab,
-                     0, 1, nrules + 1);
-  obstack_1grow (&table_obstack, '\n');
-
-  XFREE (short_tab);
-
-  XFREE (rrhs + 1);
-}
-
-
-static void
-output_defines (void)
-{
-  obstack_fgrow1 (&table_obstack, "\n\n#define\tYYFINAL\t\t%d\n", final_state);
-  obstack_fgrow1 (&table_obstack, "#define\tYYFLAG\t\t%d\n", MINSHORT);
-  obstack_fgrow1 (&table_obstack, "#define\tYYNTBASE\t%d\n", ntokens);
+  {
+    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);
+  }

 }
 
 
 }
 
 

-/*------------------------------------------------------------------.
-| 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.                  |
-`------------------------------------------------------------------*/
-
-static int
-action_row (int state)
-{
-  int i;
-  int j;
-  int k;
-  int m = 0;
-  int n = 0;
-  int count;
-  int default_rule;
-  int nreds;
-  int max;
-  int rule;
-  int shift_state;
-  int symbol;
-  unsigned mask;
-  unsigned *wordp;
-  reductions *redp;
-  shifts *shiftp;
-  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;
-
-      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++)
-      {
-       if (actrow[j] == MINSHORT)
-         actrow[j] = 0;
-      }
-
-  return default_rule;
-}
-
+/*-------------------------------------------------------------.
+| Prepare the muscles related to the rules: rhs, prhs, r1, r2, |
+| rline, dprec, merger.                                        |
+`-------------------------------------------------------------*/

 
 static void
 
 static void

-save_row (int state)
+prepare_rules (void)

 {
 {

-  int i;
-  int count;
-  short *sp;
-  short *sp1;
-  short *sp2;
-
-  count = 0;
-  for (i = 0; i < ntokens; i++)
+  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)

     {
     {

-      if (actrow[i] != 0)
-       count++;
+      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;

     }
     }

-
-  if (count == 0)
-    return;
-
-  froms[state] = sp1 = sp = XCALLOC (short, count);
-  tos[state] = sp2 = XCALLOC (short, count);
-
-  for (i = 0; i < ntokens; i++)
-    {
-      if (actrow[i] != 0)
-       {
-         *sp1++ = i;
-         *sp2++ = actrow[i];
-       }
-    }
-
-  tally[state] = count;
-  width[state] = sp1[-1] - sp[0] + 1;
+  if (i != nritems)
+    abort ();
+
+  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);

 }
 
 }
 

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

 
 static void
 
 static void

-token_actions (void)
+prepare_states (void)

 {
 {

-  int i;
-  short *yydefact = XCALLOC (short, nstates);
-
-  actrow = XCALLOC (short, ntokens);
+  state_number i;
+  symbol_number *values = xnmalloc (nstates, sizeof *values);

   for (i = 0; i < nstates; ++i)
   for (i = 0; i < nstates; ++i)

-    {
-      yydefact[i] = action_row (i);
-      save_row (i);
-    }
-  XFREE (actrow);
-
-  output_short_table (&table_obstack,
-  "YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE\n\
-   doesn't specify something else to do.  Zero means the default is an\n\
-   error",
-                     "yydefact", yydefact,
-                     yydefact[0], 1, nstates);
-  obstack_1grow (&table_obstack, '\n');
-  XFREE (yydefact);
+    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);

 }
 
 
 }
 
 

-static void
-free_shifts (void)
-{
-  shifts *sp, *sptmp;  /* JF derefrenced freed ptr */
-
-  XFREE (shift_table);
-
-  for (sp = first_shift; sp; sp = sptmp)
-    {
-      sptmp = sp->next;
-      XFREE (sp);
-    }
-}

 
 

+/*---------------------------------.
+| Output the user actions to OUT.  |
+`---------------------------------*/

 
 static void
 
 static void

-free_reductions (void)
+user_actions_output (FILE *out)

 {
 {

-  reductions *rp, *rptmp;      /* JF fixed freed ptr */
+  rule_number r;

 
 

-  XFREE (reduction_table);
-
-  for (rp = first_reduction; rp; rp = rptmp)
-    {
-      rptmp = rp->next;
-      XFREE (rp);
-    }
+  fputs ("m4_define([b4_actions], \n[[", out);
+  for (r = 0; r < nrules; ++r)
+    if (rules[r].action)
+      {
+       fprintf (out, "  case %d:\n", r + 1);
+
+       fprintf (out, "]b4_syncline([[%d]], ",
+                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);
+      }
+  fputs ("]])\n\n", out);

 }
 
 }
 

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

 
 static void
 
 static void

-save_column (int symbol, int default_state)
-{
-  int i;
-  short *sp;
-  short *sp1;
-  short *sp2;
-  int count;
-  int symno;
-
-  short begin = goto_map[symbol];
-  short end = goto_map[symbol + 1];
-
-  count = 0;
-  for (i = begin; i < end; i++)
-    {
-      if (to_state[i] != default_state)
-       count++;
-    }
-
-  if (count == 0)
-    return;
-
-  symno = symbol - ntokens + nstates;
-
-  froms[symno] = sp1 = sp = XCALLOC (short, count);
-  tos[symno] = sp2 = XCALLOC (short, count);
-
-  for (i = begin; i < end; 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;
-}
-
-static int
-default_goto (int symbol)
+merger_output (FILE *out)

 {
 {

-  int i;
-  int m;

   int n;
   int n;

-  int default_state;
-  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]]++;
+  merger_list* p;

 
 

-  max = 0;
-  default_state = -1;
-
-  for (i = 0; i < nstates; i++)
+  fputs ("m4_define([b4_mergers], \n[[", out);
+  for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next)

     {
     {

-      if (state_count[i] > max)
-       {
-         max = state_count[i];
-         default_state = i;
-       }
+      if (p->type[0] == '\0')
+       fprintf (out, "  case %d: *yy0 = %s (*yy0, *yy1); break;\n",
+                n, p->name);
+      else
+       fprintf (out, "  case %d: yy0->%s = %s (*yy0, *yy1); break;\n",
+                n, p->type, p->name);

     }
     }

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

 }
 
 }
 

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

 
 static void
 
 static void

-goto_actions (void)
+token_definitions_output (FILE *out)

 {
   int i;
 {
   int i;

+  char const *sep = "";

 
 

-  short *yydefgoto = XMALLOC (short, nsyms - ntokens);
-  state_count = XCALLOC (short, nstates);
-
-  for (i = ntokens; i < nsyms; ++i)
+  fputs ("m4_define([b4_tokens], \n[", out);
+  for (i = 0; i < ntokens; ++i)

     {
     {

-      int default_state = default_goto (i);
-      save_column (i, default_state);
-      yydefgoto[i - ntokens] = default_state;
+      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.  */
+      if (number == USER_NUMBER_ALIAS)
+       abort ();
+
+      /* Skip error token.  */
+      if (sym == errtoken)
+       continue;
+
+      /* If this string has an alias, then it is necessarily the alias
+        which is to be output.  */
+      if (sym->alias)
+       sym = sym->alias;
+
+      /* 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;
+
+      /* 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;
+
+      fprintf (out, "%s[[[%s]], [%d]]",
+              sep, sym->tag, number);
+      sep = ",\n";

     }
     }

-
-  output_short_table (&table_obstack, NULL, "yydefgoto", yydefgoto,
-                     yydefgoto[0], 1, nsyms - ntokens);
-
-  XFREE (state_count);
-  XFREE (yydefgoto);
+  fputs ("])\n\n", out);

 }
 
 
 }
 
 

-/* The next few functions decide how to pack the actions and gotos
-   information into yytable. */
+/*---------------------------------------.
+| Output the symbol destructors to OUT.  |
+`---------------------------------------*/

 
 static void
 
 static void

-sort_actions (void)
+symbol_destructors_output (FILE *out)

 {
   int i;
 {
   int i;

-  int j;
-  int k;
-  int t;
-  int w;
+  char const *sep = "";

 
 

-  order = XCALLOC (short, nvectors);
-  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++;
-       }
-    }
-}
-
-
-static int
-matching_state (int vector)
-{
-  int i;
-  int j;
-  int k;
-  int t;
-  int w;
-  int match;
-  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;
+  fputs ("m4_define([b4_symbol_destructors], \n[", out);
+  for (i = 0; i < nsyms; ++i)
+    if (symbols[i]->destructor)
+      {
+       symbol *sym = symbols[i];
+
+       /* Filename, lineno,
+          Symbol-name, Symbol-number,
+          destructor, optional typename.  */
+       fprintf (out, "%s[", sep);
+       sep = ",\n";
+       escaped_file_name_output (out, sym->destructor_location.start.file);
+       fprintf (out, ", [[%d]], [[%s]], [[%d]], [[%s]]",
+                sym->destructor_location.start.line,
+                sym->tag,
+                sym->number,
+                sym->destructor);
+       if (sym->type_name)
+         fprintf (out, ", [[%s]]", sym->type_name);
+       fputc (']', out);
+      }
+  fputs ("])\n\n", out);

 }
 
 
 }
 
 

-static int
-pack_vector (int vector)
-{
-  int i;
-  int j;
-  int k;
-  int t;
-  int loc = 0;
-  int ok;
-  short *from;
-  short *to;
-
-  i = order[vector];
-  t = tally[i];
-
-  assert (t);
-
-  from = froms[i];
-  to = tos[i];
-
-  for (j = lowzero - from[0]; j < MAXTABLE; j++)
-    {
-      ok = 1;
-
-      for (k = 0; ok && k < t; k++)
-       {
-         loc = j + from[k];
-         if (loc > MAXTABLE)
-           fatal (_("maximum table size (%d) exceeded"), 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;
-       }
-    }
-
-  berror ("pack_vector");
-  return 0;                    /* JF keep lint happy */
-}
-
+/*------------------------------------.
+| Output the symbol printers to OUT.  |
+`------------------------------------*/

 
 static void
 
 static void

-pack_table (void)
+symbol_printers_output (FILE *out)

 {
   int i;
 {
   int i;

-  int place;
-  int state;
-
-  base = XCALLOC (short, nvectors);
-  pos = XCALLOC (short, nentries);
-  table = XCALLOC (short, MAXTABLE);
-  check = XCALLOC (short, MAXTABLE);
-
-  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;
-    }
-
-  for (i = 0; i < nvectors; i++)
-    {
-      if (froms[i])
-       XFREE (froms[i]);
-      if (tos[i])
-       XFREE (tos[i]);
-    }
-
-  XFREE (froms);
-  XFREE (tos);
-  XFREE (pos);
-}
-
-/* the following functions output yytable, yycheck
-   and the vectors whose elements index the portion starts */
-
-static void
-output_base (void)
-{
-  output_short_table (&table_obstack, NULL, "yypact", base,
-                     base[0], 1, nstates);
-
-  obstack_1grow (&table_obstack, '\n');
-
-  output_short_table (&table_obstack, NULL, "yypgoto", base,
-                     base[nstates], nstates + 1, nvectors);
+  char const *sep = "";

 
 

-  XFREE (base);
-}
-
-
-static void
-output_table (void)
-{
-  obstack_fgrow1 (&table_obstack, "\n\n#define\tYYLAST\t\t%d\n\n\n", high);
-  output_short_table (&table_obstack, NULL, "yytable", table,
-                     table[0], 1, high + 1);
-  XFREE (table);
+  fputs ("m4_define([b4_symbol_printers], \n[", out);
+  for (i = 0; i < nsyms; ++i)
+    if (symbols[i]->printer)
+      {
+       symbol *sym = symbols[i];
+
+       /* Filename, lineno,
+          Symbol-name, Symbol-number,
+          printer, optional typename.  */
+       fprintf (out, "%s[", sep);
+       sep = ",\n";
+       escaped_file_name_output (out, sym->printer_location.start.file);
+       fprintf (out, ", [[%d]], [[%s]], [[%d]], [[%s]]",
+                sym->printer_location.start.line,
+                sym->tag,
+                sym->number,
+                sym->printer);
+       if (sym->type_name)
+         fprintf (out, ", [[%s]]", sym->type_name);
+       fputc (']', out);
+      }
+  fputs ("])\n\n", out);

 }
 
 
 static void
 }
 
 
 static void

-output_check (void)
+prepare_actions (void)

 {
 {

-  output_short_table (&table_obstack, NULL, "yycheck", check,
-                     check[0], 1, high + 1);
-  XFREE (check);
+  /* Figure out the actions for the specified state, indexed by
+     look-ahead 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);

 }
 
 }
 

-/* compute and output yydefact, yydefgoto, yypact, yypgoto, yytable
-   and yycheck.  */
+\f
+/*---------------------------.
+| Call the skeleton parser.  |
+`---------------------------*/

 
 static void
 
 static void

-output_actions (void)
+output_skeleton (void)

 {
 {

-  nvectors = nstates + nvars;
-
-  froms = XCALLOC (short *, nvectors);
-  tos = XCALLOC (short *, nvectors);
-  tally = XCALLOC (short, nvectors);
-  width = XCALLOC (short, nvectors);
-
-  token_actions ();
-  free_shifts ();
-  free_reductions ();
-  XFREE (lookaheads);
-  XFREE (LA);
-  XFREE (LAruleno);
-  XFREE (accessing_symbol);
-
-  goto_actions ();
-  XFREE (goto_map + ntokens);
-  XFREE (from_state);
-  XFREE (to_state);
-
-  sort_actions ();
-  pack_table ();
-  obstack_1grow (&table_obstack, '\n');
-  output_base ();
-  output_table ();
-  obstack_1grow (&table_obstack, '\n');
-  output_check ();
+  FILE *in;
+  FILE *out;
+  int filter_fd[2];
+  char const *argv[6];
+  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 *full_m4sugar;
+  char *full_cm4;
+  char *full_skeleton;
+  char const *p;
+  char const *m4 = (p = getenv ("M4")) ? p : M4;
+  char const *pkgdatadir = (p = getenv ("BISON_PKGDATADIR")) ? p : 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));
+  strcpy (full_skeleton, pkgdatadir);
+  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, 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_cm4, full_skeleton);
+
+  argv[0] = m4;
+  argv[1] = full_m4sugar;
+  argv[2] = "-";
+  argv[3] = full_cm4;
+  argv[4] = full_skeleton;
+  argv[5] = NULL;
+
+  init_subpipe ();
+  pid = create_subpipe (argv, filter_fd);
+  free (full_m4sugar);
+  free (full_cm4);
+  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_destructors_output (out);
+  symbol_printers_output (out);
+
+  muscles_m4_output (out);
+
+  fputs ("m4_wrap([m4_divert_pop(0)])\n", out);
+  fputs ("m4_divert_push(0)dnl\n", out);
+  xfclose (out);
+
+  /* Read and process m4's output.  */
+  timevar_push (TV_M4);
+  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 TABLE_OBSTACK.  |
-`------------------------------------------*/
-

 static void
 static void

-output_parser (void)
+prepare (void)

 {
 {

-  int c;
-  FILE *fskel;
-  size_t line;
-  const char *skeleton = NULL;
-  int actions_dumped = 0;
-
-  if (pure_parser)
-    obstack_grow_string (&table_obstack, "#define YYPURE 1\n\n");
-
-  /* Loop over lines in the standard parser file.  */
-  if (semantic_parser)
-    skeleton = skeleton_find ("BISON_HAIRY", BISON_HAIRY);
-  else
-    skeleton = skeleton_find ("BISON_SIMPLE", BISON_SIMPLE);
-  fskel = xfopen (skeleton, "r");
-
-  /* Set LINE to 2, not 1: `#line LINENUM' -- Here LINENUM is a
-     decimal integer constant.  This specifies that the line number of
-     the *following* line of input, in its original source file, was
-     LINENUM.  */
-  line = 2;
-
-  while (1)
+  /* Flags. */
+  MUSCLE_INSERT_BOOL ("debug", debug_flag);
+  MUSCLE_INSERT_BOOL ("defines_flag", defines_flag);
+  MUSCLE_INSERT_BOOL ("error_verbose", error_verbose);
+  MUSCLE_INSERT_BOOL ("locations_flag", locations_flag);
+  MUSCLE_INSERT_BOOL ("pure", pure_parser);
+  MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
+
+  /* File names.  */
+  MUSCLE_INSERT_STRING ("prefix", spec_name_prefix ? spec_name_prefix : "yy");
+
+  /* User Code.  */
+  obstack_1grow (&pre_prologue_obstack, 0);
+  obstack_1grow (&post_prologue_obstack, 0);
+  muscle_insert ("pre_prologue", obstack_finish (&pre_prologue_obstack));
+  muscle_insert ("post_prologue", obstack_finish (&post_prologue_obstack));
+
+  /* Find the right skeleton file.  */
+  if (!skeleton)

     {
     {

-      enum line_type_e
-       {
-         regular_line,
-         sync_line,    /* #line. */
-         actions_line  /* %% actions. */
-       };
-      enum line_type_e line_type = regular_line;
-
-      c = getc (fskel);
-
-      /* Is this line special? */
-      if (c == '#')
-       {
-         /* See if it's a `#line' line. */
-         if ((c = getc (fskel)) == 'l')
-           if ((c = getc (fskel)) == 'i')
-             if ((c = getc (fskel)) == 'n')
-               if ((c = getc (fskel)) == 'e')
-                 line_type = sync_line;
-               else
-                 obstack_grow_string (&table_obstack, "#lin");
-             else
-               obstack_grow_string (&table_obstack, "#li");
-           else
-             obstack_grow_string (&table_obstack, "#l");
-         else
-           obstack_grow_string (&table_obstack, "#");
-       }
-      else if (c == '%')
-       {
-         /* See if it's a `%% actions' line. */
-         if ((c = getc (fskel)) == '%')
-           if ((c = getc (fskel)) == ' ')
-             if ((c = getc (fskel)) == 'a')
-               if ((c = getc (fskel)) == 'c')
-                 if ((c = getc (fskel)) == 't')
-                   if ((c = getc (fskel)) == 'i')
-                     if ((c = getc (fskel)) == 'o')
-                       if ((c = getc (fskel)) == 'n')
-                         if ((c = getc (fskel)) == 's')
-                           line_type = actions_line;
-                         else
-                           obstack_grow_string (&table_obstack, "%% action");
-                       else
-                         obstack_grow_string (&table_obstack, "%% actio");
-                     else
-                       obstack_grow_string (&table_obstack, "%% acti");
-                   else
-                     obstack_grow_string (&table_obstack, "%% act");
-                 else
-                   obstack_grow_string (&table_obstack, "%% ac");
-               else
-                 obstack_grow_string (&table_obstack, "%% a");
-             else
-               obstack_grow_string (&table_obstack, "%% ");
-           else
-             obstack_grow_string (&table_obstack, "%%");
-         else
-           obstack_grow_string (&table_obstack, "%");
-       }
-
-      switch (line_type)
-       {
-       case sync_line:
-         if (!no_lines_flag)
-           obstack_fgrow2 (&table_obstack, "#line %d %s\n",
-                           line, quotearg_style (c_quoting_style, skeleton));
-
-         /* Skip the end of line. */
-         for (; c != '\n' && c != EOF; c = getc (fskel))
-           /* nothing */;
-         break;
-
-       case actions_line:
-         {
-           size_t size = obstack_object_size (&action_obstack);
-
-           actions_dumped++;
-           assert (actions_dumped == 1);
-           obstack_grow (&table_obstack,
-                         obstack_finish (&action_obstack),
-                         size);
-         }
-
-         /* Skip the end of line. */
-         for (; c != '\n' && c != EOF; c = getc (fskel))
-           /* nothing */;
-         break;
-
-       case regular_line:
-         for (; c != '\n' && c != EOF; c = getc (fskel))
-           obstack_1grow (&table_obstack, c);
-       }
-
-      if (c == EOF)
-       break;
-      obstack_1grow (&table_obstack, c);
-      line++;
+      if (glr_parser || nondeterministic_parser)
+       skeleton = "glr.c";
+      else
+       skeleton = "yacc.c";

     }
     }

-  assert (actions_dumped == 1);
-  xfclose (fskel);
-}
-
-static void
-output_program (void)
-{
-  int c;
-
-  if (!no_lines_flag)
-    obstack_fgrow2 (&table_obstack, "#line %d %s\n",
-                   lineno, quotearg_style (c_quoting_style, infile));

 
 

-  while ((c = getc (finput)) != EOF)
-    obstack_1grow (&table_obstack, c);
-}
-
-
-static void
-free_itemsets (void)
-{
-  core *cp, *cptmp;
-
-  XFREE (state_table);
-
-  for (cp = first_state; cp; cp = cptmp)
-    {
-      cptmp = cp->next;
-      XFREE (cp);
-    }
+  /* Parse the skeleton file and output the needed parsers.  */
+  MUSCLE_INSERT_C_STRING ("skeleton", skeleton);

 }
 
 
 }
 
 


@@ -1306,51 +631,19 @@ free_itemsets (void)
 void
 output (void)
 {
 void
 output (void)
 {

-  /* output_token_defines(ftable);      / * JF put out token defines FIRST */
+  obstack_init (&format_obstack);

 
 

-  /* If using a simple parser the definition of YYSTYPE are put into
-     TABLE_OBSTACK.  */
-  if (!semantic_parser)
-    {
-      size_t size = obstack_object_size (&attrs_obstack);
-      obstack_grow (&table_obstack, obstack_finish (&attrs_obstack), size);
-    }
-  reader_output_yylsp (&table_obstack);
-  if (debug_flag)
-    obstack_grow_string (&table_obstack, "\
-#ifndef YYDEBUG\n\
-# define YYDEBUG 1\n\
-#endif\n\
-\n");
-
-  if (semantic_parser)
-    obstack_fgrow1 (&table_obstack, "#include %s\n",
-                   quotearg_style (c_quoting_style, attrsfile));
-
-  if (!no_parser_flag)
-    obstack_grow_string (&table_obstack, "#include <stdio.h>\n\n");
-
-  /* Make "const" do nothing if not in ANSI C.  */
-  obstack_grow_string (&table_obstack, "\
-#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 ();
-  XFREE (ritem);
-  if (semantic_parser)
-    output_stos ();
-  output_rule_data ();
-  output_actions ();
-  if (!no_parser_flag)
-    output_parser ();
-  output_program ();
+  prepare_symbols ();
+  prepare_rules ();
+  prepare_states ();
+  prepare_actions ();
+
+  prepare ();
+
+  /* Process the selected skeleton file.  */
+  output_skeleton ();
+
+  obstack_free (&format_obstack, NULL);
+  obstack_free (&pre_prologue_obstack, NULL);
+  obstack_free (&post_prologue_obstack, NULL);

 }
 }