Avoid empty-if warnings.

[bison.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index 9626bdebff1b843dc93028428d38e0800236e3c5..8457ba199a81f8c9fe52663a1edae846823d4a83 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,237 +1,48 @@
-/* Output the generated parsing program for bison,
-   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002
-   Free Software Foundation, Inc.
+/* Output the generated parsing program for Bison.
+
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006, 2007, 2008 Free Software Foundation, Inc.

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

-   Bison is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.

 
 

-   Bison is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.

 
    You should have received a copy of the GNU General Public License
 
    You should have received a copy of the GNU General Public License

-   along with Bison; see the file COPYING.  If not, write to the Free
-   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
-
-
-/* The parser tables consist of these tables.
-
-   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.
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 

-   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 <config.h>
+#include "system.h"

 
 

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

 
 

-#include "system.h"
-#include "bitsetv.h"
-#include "quotearg.h"
-#include "error.h"
-#include "getargs.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 "scan-code.h"    /* max_left_semantic_context */
+#include "scan-skel.h"

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

-#include "conflicts.h"
-#include "muscle_tab.h"
+#include "tables.h"

 
 

-/* From src/scan-skel.l. */
-void m4_invoke PARAMS ((const char *definitions));
-
-
-/* Several tables will be indexed both by state and nonterminal
-   numbers.  We call `vector' such a thing (= either a state or a
-   symbol number.
-
-   Of course vector_number_t ought to be wide enough to contain
-   state_number_t and symbol_number_t.  */
-typedef short vector_number_t;
-#define VECTOR_NUMBER_MAX ((vector_number_t) SHRT_MAX)
-#define VECTOR_NUMBER_MIN ((vector_number_t) SHRT_MIN)
-#define state_number_to_vector_number(State) \
-   ((vector_number_t) State)
-#define symbol_number_to_vector_number(Symbol) \
-   ((vector_number_t) (state_number_as_int (nstates) + Symbol - ntokens))
-
-static int nvectors;
-
-
-/* FROMS and TOS are indexed by vector_number_t.
-
-   If VECTOR is a nonterminal, (FROMS[VECTOR], TOS[VECTOR]) form an
-   array of state numbers of the non defaulted GOTO on VECTOR.
-
-   If VECTOR is a state, TOS[VECTOR] is the array of actions to do on
-   the (array of) symbols FROMS[VECTOR].
-
-   In both cases, TALLY[VECTOR] is the size of the arrays
-   FROMS[VECTOR], TOS[VECTOR]; and WIDTH[VECTOR] =
-   (FROMS[VECTOR][SIZE] - FROMS[VECTOR][0] + 1) where SIZE =
-   TALLY[VECTOR].
-
-   FROMS therefore contains symbol_number_t and action_number_t,
-   TOS state_number_t and action_number_t,
-   TALLY sizes,
-   WIDTH differences of FROMS.
-
-   Let base_t be the type of FROMS, TOS, and WIDTH.  */
-typedef int base_t;
-#define BASE_MAX ((base_t) INT_MAX)
-#define BASE_MIN ((base_t) INT_MIN)
-
-static base_t **froms = NULL;
-static base_t **tos = NULL;
-static unsigned int **conflict_tos = NULL;
-static short *tally = NULL;
-static base_t *width = NULL;
-
-
-/* For a given state, N = ACTROW[SYMBOL]:
-
-   If N = 0, stands for `run the default action'.
-   If N = MIN, stands for `raise a parse error'.
-   If N > 0, stands for `shift SYMBOL and go to n'.
-   If N < 0, stands for `reduce -N'.  */
-typedef short action_t;
-#define ACTION_MAX ((action_t) SHRT_MAX)
-#define ACTION_MIN ((action_t) SHRT_MIN)
-
-static action_t *actrow = NULL;
-
-/* FROMS and TOS are reordered to be compressed.  ORDER[VECTOR] is the
-   new vector number of VECTOR.  We skip `empty' vectors (i.e.,
-   TALLY[VECTOR] = 0), and call these `entries'.  */
-static vector_number_t *order = NULL;
-static int nentries;
-
-static base_t *base = NULL;
-/* A distinguished value of BASE, negative infinite.  During the
-   computation equals to BASE_MIN, later mapped to BASE_NINF to
-   keep parser tables small.  */
-base_t base_ninf = 0;
-static base_t *pos = NULL;
-
-static unsigned int *conflrow = NULL;
-static unsigned int *conflict_table = NULL;
-static unsigned int *conflict_list = NULL;
-static int conflict_list_cnt;
-static int conflict_list_free;
-
-/* TABLE_SIZE is the allocated size of both TABLE and CHECK.  We start
-   with more or less the original hard-coded value (which was
-   SHRT_MAX).  */
-static size_t table_size = 32768;
-static base_t *table = NULL;
-static base_t *check = NULL;
-/* The value used in TABLE to denote explicit parse errors
-   (%nonassoc), a negative infinite.  First defaults to ACTION_MIN,
-   but in order to keep small tables, renumbered as TABLE_ERROR, which
-   is the smallest (non error) value minus 1.  */
-base_t table_ninf = 0;
-static int lowzero;
-static int high;

 
 static struct obstack format_obstack;
 
 
 static struct obstack format_obstack;
 

-int error_verbose = 0;
-
-
-/*----------------------------------------------------------------.
-| If TABLE (and CHECK) appear to be small to be addressed at      |
-| DESIRED, grow them.  Note that TABLE[DESIRED] is to be used, so |
-| the desired size is at least DESIRED + 1.                       |
-`----------------------------------------------------------------*/
-
-static void
-table_grow (size_t desired)
-{
-  size_t old_size = table_size;
-
-  while (table_size <= desired)
-    table_size *= 2;
-
-  if (trace_flag & trace_resource)
-    fprintf (stderr, "growing table and check from: %d to %d\n",
-            old_size, table_size);
-
-  table = XREALLOC (table, base_t, table_size);
-  check = XREALLOC (check, base_t, table_size);
-  if (glr_parser)
-    conflict_table = XREALLOC (conflict_table, unsigned int, table_size);
-
-  for (/* Nothing. */; old_size < table_size; ++old_size)
-    {
-      table[old_size] = 0;
-      check[old_size] = -1;
-    }
-}
-

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


@@ -244,7 +55,7 @@ table_grow (size_t desired)
 #define GENERATE_MUSCLE_INSERT_TABLE(Name, Type)                       \
                                                                        \
 static void                                                            \
 #define GENERATE_MUSCLE_INSERT_TABLE(Name, Type)                       \
                                                                        \
 static void                                                            \

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

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


@@ -252,6 +63,8 @@ Name (const char *name,                                                      \
 {                                                                      \
   Type min = first;                                                    \
   Type max = first;                                                    \
 {                                                                      \
   Type min = first;                                                    \
   Type max = first;                                                    \

+  long int lmin;                                                       \
+  long int lmax;                                                       \

   int i;                                                               \
   int j = 1;                                                           \
                                                                        \
   int i;                                                               \
   int j = 1;                                                           \
                                                                        \


@@ -275,67 +88,99 @@ Name (const char *name,                                                    \
   obstack_1grow (&format_obstack, 0);                                  \
   muscle_insert (name, obstack_finish (&format_obstack));              \
                                                                        \
   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);                                  \
   /* 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),            \
-                         (long int) min);                              \
+  MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmin);     \

   obstack_fgrow1 (&format_obstack, "%s_max", name);                    \
   obstack_1grow (&format_obstack, 0);                                  \
   obstack_fgrow1 (&format_obstack, "%s_max", name);                    \
   obstack_1grow (&format_obstack, 0);                                  \

-  MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack),            \
-                         (long int) max);                              \
+  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_unsigned_int_table, unsigned int)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_int_table, int)

-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_short_table, short)
-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_base_table, base_t)
-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_rule_number_table, rule_number_t)
-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_symbol_number_table, symbol_number_t)
-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number_t)
-GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number_t)
+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)

 
 
 
 

-/*-----------------------------------------------------------------.
-| Prepare the muscles related to the tokens: translate, tname, and |
-| toknum.                                                          |
-`-----------------------------------------------------------------*/
+/*--------------------------------------------------------------------.
+| Print to OUT a representation of STRING escaped both for C and M4.  |
+`--------------------------------------------------------------------*/

 
 static void
 
 static void

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

 {
 {

+  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;
+      }
+
+  fprintf (out, "]]");
+}
+
+
+/*------------------------------------------------------------------.
+| Prepare the muscles related to the symbols: translate, tname, and |
+| toknum.                                                           |
+`------------------------------------------------------------------*/
+
+static void
+prepare_symbols (void)
+{
+  MUSCLE_INSERT_BOOL ("token_table", token_table_flag);
+  MUSCLE_INSERT_INT ("tokens_number", ntokens);
+  MUSCLE_INSERT_INT ("nterms_number", nvars);
+  MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);
+  MUSCLE_INSERT_INT ("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);
 
   muscle_insert_symbol_number_table ("translate",
                                     token_translations,
                                     token_translations[0],
                                     1, max_user_token_number + 1);
 

+  /* tname -- token names.  */

   {
     int i;
   {
     int i;

-    int j = 0;
+    /* We assume that the table will be output starting at column 2. */
+    int j = 2;
+    struct quoting_options *qo = clone_quoting_options (0);
+    set_quoting_style (qo, c_quoting_style);
+    set_quoting_flags (qo, QA_SPLIT_TRIGRAPHS);

     for (i = 0; i < nsyms; i++)
       {
     for (i = 0; i < nsyms; i++)
       {

-       /* Be sure not to use twice the same QUOTEARG slot:
-          SYMBOL_TAG_GET uses slot 0.  */
-       const char *cp =
-         quotearg_n_style (1, c_quoting_style,
-                           symbols[i]->tag);
-       /* Width of the next token, including the two quotes, the coma
-          and the space.  */
-       int strsize = strlen (cp) + 2;
-
-       if (j + strsize > 75)
+       char *cp = quotearg_alloc (symbols[i]->tag, -1, qo);
+       /* Width of the next token, including the two quotes, the
+          comma and the space.  */
+       int width = strlen (cp) + 2;
+
+       if (j + width > 75)

          {
          {

-           obstack_sgrow (&format_obstack, "\n  ");
-           j = 2;
+           obstack_sgrow (&format_obstack, "\n ");
+           j = 1;

          }
 
          }
 

-       obstack_sgrow (&format_obstack, cp);
-       obstack_sgrow (&format_obstack, ", ");
-       j += strsize;
+       if (i)
+         obstack_1grow (&format_obstack, ' ');
+       MUSCLE_OBSTACK_SGROW (&format_obstack, cp);
+        free (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");
+    free (qo);
+    obstack_sgrow (&format_obstack, " ]b4_null[");

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


@@ -345,7 +190,7 @@ prepare_tokens (void)
   /* Output YYTOKNUM. */
   {
     int i;
   /* Output YYTOKNUM. */
   {
     int i;

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

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


@@ -357,25 +202,25 @@ prepare_tokens (void)
 
 /*-------------------------------------------------------------.
 | Prepare the muscles related to the rules: rhs, prhs, r1, r2, |
 
 /*-------------------------------------------------------------.
 | Prepare the muscles related to the rules: rhs, prhs, r1, r2, |

-| rline, dprec, merger                                         |
+| rline, dprec, merger.                                        |

 `-------------------------------------------------------------*/
 
 static void
 prepare_rules (void)
 {
 `-------------------------------------------------------------*/
 
 static void
 prepare_rules (void)
 {

-  rule_number_t r;
+  rule_number r;

   unsigned int i = 0;
   unsigned int i = 0;

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

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

-      item_number_t *rhsp = NULL;
+      item_number *rhsp = NULL;

       /* Index of rule R in RHS. */
       prhs[r] = i;
       /* RHS of the rule R. */
       /* Index of rule R in RHS. */
       prhs[r] = i;
       /* RHS of the rule R. */


@@ -388,21 +233,24 @@ prepare_rules (void)
       /* Separator in RHS. */
       rhs[i++] = -1;
       /* Line where rule was defined. */
       /* Separator in RHS. */
       rhs[i++] = -1;
       /* Line where rule was defined. */

-      rline[r] = rules[r].location.first_line;
-      /* Dynamic precedence (GLR) */
+      rline[r] = rules[r].location.start.line;
+      /* Dynamic precedence (GLR).  */

       dprec[r] = rules[r].dprec;
       dprec[r] = rules[r].dprec;

-      /* Merger-function index (GLR) */
+      /* Merger-function index (GLR).  */

       merger[r] = rules[r].merger;
     }
       merger[r] = rules[r].merger;
     }

-  assert (i == nritems);
+  aver (i == nritems);

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

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

 
   free (rhs);
   free (prhs);
 
   free (rhs);
   free (prhs);


@@ -420,341 +268,65 @@ prepare_rules (void)
 static void
 prepare_states (void)
 {
 static void
 prepare_states (void)
 {

-  state_number_t i;
-  symbol_number_t *values =
-    (symbol_number_t *) alloca (sizeof (symbol_number_t) * nstates);
+  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);
   for (i = 0; i < nstates; ++i)
     values[i] = states[i]->accessing_symbol;
   muscle_insert_symbol_number_table ("stos", values,
                                     0, 1, nstates);

-}
-
-
-/*-------------------------------------------------------------------.
-| For GLR parsers, for each conflicted token in STATE, as indicated  |
-| by non-zero entries in CONFLROW, create a list of possible        |
-| reductions that are alternatives to the shift or reduction        |
-| currently recorded for that token in STATE.  Store the alternative |
-| reductions followed by a 0 in CONFLICT_LIST, updating                     |
-| CONFLICT_LIST_CNT, and storing an index to the start of the list   |
-| back into CONFLROW.                                               |
-`-------------------------------------------------------------------*/
-
-static void
-conflict_row (state_t *state)
-{
-  int i, j;
-
-  if (! glr_parser)
-    return;
-
-  for (j = 0; j < ntokens; j += 1)
-    if (conflrow[j])
-      {
-       conflrow[j] = conflict_list_cnt;
-
-       /* Find all reductions for token J, and record all that do not
-          match ACTROW[J].  */
-       for (i = 0; i < state->nlookaheads; i += 1)
-         if (bitset_test (state->lookaheads[i], j)
-             && (actrow[j]
-                 != rule_number_as_item_number (state->lookaheads_rule[i]->number)))
-           {
-             assert (conflict_list_free > 0);
-             conflict_list[conflict_list_cnt]
-               = state->lookaheads_rule[i]->number + 1;
-             conflict_list_cnt += 1;
-             conflict_list_free -= 1;
-           }
-
-       /* Leave a 0 at the end.  */
-       assert (conflict_list_free > 0);
-       conflict_list_cnt += 1;
-       conflict_list_free -= 1;
-      }
-}
-
-
-/*------------------------------------------------------------------.
-| 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       |
-| ACTION_MIN, 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.                  |
-|                                                                   |
-| For GLR parsers, also sets CONFLROW[SYM] to an index into         |
-| CONFLICT_LIST iff there is an unresolved conflict (s/r or r/r)    |
-| with symbol SYM. The default reduction is not used for a symbol   |
-| that has any such conflicts.                                      |
-`------------------------------------------------------------------*/
+  free (values);

 
 

-static rule_t *
-action_row (state_t *state)
-{
-  int i;
-  rule_t *default_rule = NULL;
-  reductions_t *redp = state->reductions;
-  transitions_t *transitions = state->transitions;
-  errs_t *errp = state->errs;
-  /* Set to nonzero to inhibit having any default reduction.  */
-  int nodefault = 0;
-  int conflicted = 0;
-
-  for (i = 0; i < ntokens; i++)
-    actrow[i] = conflrow[i] = 0;
-
-  if (redp->num >= 1)
-    {
-      int j;
-      bitset_iterator biter;
-      /* loop over all the rules available here which require
-        lookahead */
-      for (i = state->nlookaheads - 1; i >= 0; --i)
-       /* and find each token which the rule finds acceptable
-          to come next */
-       BITSET_FOR_EACH (biter, state->lookaheads[i], j, 0)
-       {
-         /* and record this rule as the rule to use if that
-            token follows.  */
-         if (actrow[j] != 0)
-           conflicted = conflrow[j] = 1;
-         actrow[j] = rule_number_as_item_number (state->lookaheads_rule[i]->number);
-       }
-    }
-
-  /* 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.  */
-  FOR_EACH_SHIFT (transitions, i)
-    {
-      symbol_number_t symbol = TRANSITION_SYMBOL (transitions, i);
-      state_t *shift_state = transitions->states[i];
-
-      if (actrow[symbol] != 0)
-       conflicted = conflrow[symbol] = 1;
-      actrow[symbol] = state_number_as_int (shift_state->number);
-
-      /* Do not use any default reduction if there is a shift for
-        error */
-      if (symbol == errtoken->number)
-       nodefault = 1;
-    }
-
-  /* See which tokens are an explicit error in this state (due to
-     %nonassoc).  For them, record ACTION_MIN as the action.  */
-  for (i = 0; i < errp->num; i++)
-    {
-      symbol_t *symbol = errp->symbols[i];
-      actrow[symbol->number] = ACTION_MIN;
-    }
-
-  /* Now find the most common reduction and make it the default action
-     for this state.  */
-
-  if (redp->num >= 1 && !nodefault)
-    {
-      if (state->consistent)
-       default_rule = redp->rules[0];
-      else
-       {
-         int max = 0;
-         for (i = 0; i < state->nlookaheads; i++)
-           {
-             int count = 0;
-             rule_t *rule = state->lookaheads_rule[i];
-             symbol_number_t j;
-
-             for (j = 0; j < ntokens; j++)
-               if (actrow[j] == rule_number_as_item_number (rule->number))
-                 count++;
-
-             if (count > max)
-               {
-                 max = count;
-                 default_rule = rule;
-               }
-           }
-
-         /* GLR parsers need space for conflict lists, so we can't
-            default conflicted entries.  For non-conflicted entries
-            or as long as we are not building a GLR parser,
-            actions that match the default are replaced with zero,
-            which means "use the default". */
-
-         if (max > 0)
-           {
-             int j;
-             for (j = 0; j < ntokens; j++)
-               if (actrow[j] == rule_number_as_item_number (default_rule->number)
-                   && ! (glr_parser && conflrow[j]))
-                 actrow[j] = 0;
-           }
-       }
-    }
-
-  /* Find the rules which are reduced.  */
-  if (!glr_parser)
-    {
-      for (i = 0; i < ntokens; i++)
-       if (actrow[i] < 0 && actrow[i] != ACTION_MIN)
-         rules[item_number_as_rule_number (actrow[i])].useful = TRUE;
-      if (default_rule)
-       default_rule->useful = TRUE;
-    }
-
-  /* If have no default rule, the default is an error.
-     So replace any action which says "error" with "use default".  */
-
-  if (!default_rule)
-    for (i = 0; i < ntokens; i++)
-      if (actrow[i] == ACTION_MIN)
-       actrow[i] = 0;
-
-  if (conflicted)
-    conflict_row (state);
-
-  return default_rule;
+  MUSCLE_INSERT_INT ("last", high);
+  MUSCLE_INSERT_INT ("final_state_number", final_state->number);
+  MUSCLE_INSERT_INT ("states_number", nstates);

 }
 
 
 }
 
 

-/*--------------------------------------------.
-| Set FROMS, TOS, TALLY and WIDTH for STATE.  |
-`--------------------------------------------*/
-
-static void
-save_row (state_number_t state)
-{
-  symbol_number_t i;
-  int count;
-  base_t *sp = NULL;
-  base_t *sp1 = NULL;
-  base_t *sp2 = NULL;
-  unsigned int *sp3 = NULL;
-
-  /* Number of non default actions in STATE.  */
-  count = 0;
-  for (i = 0; i < ntokens; i++)
-    if (actrow[i] != 0)
-      count++;
-
-  if (count == 0)
-    return;
-
-  /* Allocate non defaulted actions.  */
-  froms[state] = sp1 = sp = XCALLOC (base_t, count);
-  tos[state] = sp2 = XCALLOC (base_t, count);
-  if (glr_parser)
-    conflict_tos[state] = sp3 = XCALLOC (unsigned int, count);
-  else
-    conflict_tos[state] = NULL;
-
-  /* Store non defaulted actions.  */
-  for (i = 0; i < ntokens; i++)
-    if (actrow[i] != 0)
-      {
-       *sp1++ = i;
-       *sp2++ = actrow[i];
-       if (glr_parser)
-         *sp3++ = conflrow[i];
-      }
-
-  tally[state] = count;
-  width[state] = sp1[-1] - sp[0] + 1;
-}
-

 
 

-/*------------------------------------------------------------------.
-| 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.                                       |
-`------------------------------------------------------------------*/
+/*-----------------------------------------------.
+| For each symbol type, its tags and type name.  |
+`-----------------------------------------------*/

 
 static void
 
 static void

-token_actions (void)
+type_names_output (FILE *out)

 {
 {

-  state_number_t i;
-  rule_number_t r;
-  int nconflict = conflicts_total_count ();
-
-  rule_number_t *yydefact = XCALLOC (rule_number_t, nstates);
-
-  actrow = XCALLOC (action_t, ntokens);
-  conflrow = XCALLOC (unsigned int, ntokens);
-
-  /* Now that the parser was computed, we can find which rules are
-     really reduced, and which are not because of SR or RR conflicts.
-     */
-  if (!glr_parser)
-    for (r = 0; r < nrules; ++r)
-      rules[r].useful = FALSE;
-
-  if (glr_parser)
-    {
-      conflict_list = XCALLOC (unsigned int, 1 + 2 * nconflict);
-      conflict_list_free = 2 * nconflict;
-      conflict_list_cnt = 1;
-    }
-  else
-    conflict_list_free = conflict_list_cnt = 0;
+  int i;
+  char const *sep = "";

 
 

-  for (i = 0; i < nstates; ++i)
+  fputs ("m4_define([b4_type_names],\n[", out);
+  for (i = 0; i < nsyms; ++i)

     {
     {

-      rule_t *default_rule = action_row (states[i]);
-      yydefact[i] = default_rule ? default_rule->number + 1 : 0;
-      save_row (i);
+      symbol *sym = symbols[i];
+      /* Symbol-name, Symbol-number, optional typename.  */
+      fprintf (out, "%s[", i ? ",\n" : "");
+      escaped_output (out, sym->tag);
+      fprintf (out, ", %d, [[%s]]]",
+               sym->number,
+               sym->type_name ? sym->type_name : "");

     }
     }

-
-  muscle_insert_rule_number_table ("defact", yydefact,
-                                  yydefact[0], 1, nstates);
-
-  if (!glr_parser)
-    for (r = 0; r < nrules ; ++r)
-      if (!rules[r].useful)
-       {
-         LOCATION_PRINT (stderr, rules[r].location);
-         fprintf (stderr, ": %s: %s: ",
-                  _("warning"), _("rule never reduced because of conflicts"));
-         rule_print (&rules[r], stderr);
-       }
-
-  XFREE (actrow);
-  XFREE (conflrow);
-  XFREE (yydefact);
+  fputs ("])\n\n", out);

 }
 
 
 }
 
 

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

 
 

-void
-actions_output (FILE *out)
+static void
+user_actions_output (FILE *out)

 {
 {

-  rule_number_t r;
+  rule_number r;

 
 

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

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

-       fprintf (out, "  case %d:\n", r + 1);
-
-       if (!no_lines_flag)
-         fprintf (out, muscle_find ("linef"),
-                  rules[r].action_location.first_line,
-                  quotearg_style (c_quoting_style,
-                                  muscle_find ("filename")));
-       fprintf (out, "    %s\n    break;\n\n",
-                rules[r].action);
+       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);

       }
       }

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

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


@@ -771,472 +343,119 @@ merger_output (FILE *out)
   for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next)
     {
       if (p->type[0] == '\0')
   for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next)
     {
       if (p->type[0] == '\0')

-       fprintf (out, "  case %d: yyval = %s (*yy0, *yy1); break;\n",
+       fprintf (out, "  case %d: *yy0 = %s (*yy0, *yy1); break;\n",

                 n, p->name);
       else
                 n, p->name);
       else

-       fprintf (out, "  case %d: yyval.%s = %s (*yy0, *yy1); break;\n",
+       fprintf (out, "  case %d: yy0->%s = %s (*yy0, *yy1); break;\n",

                 n, p->type, p->name);
     }
   fputs ("]])\n\n", out);
 }
 
                 n, p->type, p->name);
     }
   fputs ("]])\n\n", out);
 }
 

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

 
 

-void
+static void

 token_definitions_output (FILE *out)
 {
   int i;
 token_definitions_output (FILE *out)
 {
   int i;

-  int first = 1;
+  char const *sep = "";

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

-      symbol_t *symbol = symbols[i];
-      int number = symbol->user_token_number;
+      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.  */
 
       /* At this stage, if there are literal aliases, they are part of
         SYMBOLS, so we should not find symbols which are the aliases
         here.  */

-      assert (number != USER_NUMBER_ALIAS);
+      aver (number != USER_NUMBER_ALIAS);

 
       /* Skip error token.  */
 
       /* Skip error token.  */

-      if (symbol == errtoken)
+      if (sym == errtoken)

        continue;
 
       /* If this string has an alias, then it is necessarily the alias
         which is to be output.  */
        continue;
 
       /* If this string has an alias, then it is necessarily the alias
         which is to be output.  */

-      if (symbol->alias)
-       symbol = symbol->alias;
+      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"'.  */
 
       /* 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 (symbol->tag[0] == '\'' || symbol->tag[0] == '\"')
+      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).  */
        continue;
 
       /* Don't #define nonliteral tokens whose names contain periods
         or '$' (as does the default value of the EOF token).  */

-      if (strchr (symbol->tag, '.') || strchr (symbol->tag, '$'))
+      if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))

        continue;
 
        continue;
 

-      fprintf (out, "%s[[[%s]], [%d]]",
-              first ? "" : ",\n", symbol->tag, number);
-
-      first = 0;
+      fprintf (out, "%s[[[%s]], %d]",
+              sep, sym->tag, number);
+      sep = ",\n";

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

-/*----------------------------------------.
-| Output the symbol destructors to OOUT.  |
-`----------------------------------------*/
-
-static void
-symbol_destructors_output (FILE *out)
-{
-  int i;
-  int first = 1;
-
-  fputs ("m4_define([b4_symbol_destructors], \n[", out);
-  for (i = 0; i < nsyms; ++i)
-    if (symbols[i]->destructor)
-      {
-       symbol_t *symbol = symbols[i];
-
-       /* Filename, lineno,
-          Symbol-name, Symbol-number,
-          destructor, typename. */
-       fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
-                first ? "" : ",\n",
-                infile, symbol->destructor_location.first_line,
-                symbol->tag,
-                symbol->number,
-                symbol->destructor,
-                symbol->type_name);
-
-       first = 0;
-      }
-  fputs ("])\n\n", out);
-}
-
-
-/*-------------------------------------.
-| Output the symbol printers to OOUT.  |
-`-------------------------------------*/
+/*---------------------------------------------------.
+| Output the symbol destructors or printers to OUT.  |
+`---------------------------------------------------*/

 
 static void
 
 static void

-symbol_printers_output (FILE *out)
+symbol_code_props_output (FILE *out, char const *what,
+                          code_props const *(*get)(symbol const *))

 {
   int i;
 {
   int i;

-  int first = 1;
+  char const *sep = "";

 
 

-  fputs ("m4_define([b4_symbol_printers], \n[", out);
+  fputs ("m4_define([b4_symbol_", out);
+  fputs (what, out);
+  fputs ("], \n[", out);

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

-    if (symbols[i]->destructor)
-      {
-       symbol_t *symbol = symbols[i];
-
-       /* Filename, lineno,
-          Symbol-name, Symbol-number,
-          destructor, typename. */
-       fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
-                first ? "" : ",\n",
-                infile, symbol->printer_location.first_line,
-                symbol->tag,
-                symbol->number,
-                symbol->printer,
-                symbol->type_name);
-
-       first = 0;
-      }
+    {
+      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);
 }
 
 
   fputs ("])\n\n", out);
 }
 
 

-/*------------------------------------------------------------------.
-| Compute FROMS[VECTOR], TOS[VECTOR], TALLY[VECTOR], WIDTH[VECTOR], |
-| i.e., the information related to non defaulted GOTO on the nterm  |
-| SYMBOL.                                                           |
-|                                                                   |
-| DEFAULT_STATE is the principal destination on SYMBOL, i.e., the   |
-| default GOTO destination on SYMBOL.                               |
-`------------------------------------------------------------------*/
-
-static void
-save_column (symbol_number_t symbol, state_number_t default_state)
-{
-  int i;
-  base_t *sp;
-  base_t *sp1;
-  base_t *sp2;
-  int count;
-  vector_number_t symno = symbol_number_to_vector_number (symbol);
-
-  goto_number_t begin = goto_map[symbol];
-  goto_number_t end = goto_map[symbol + 1];
-
-  /* Number of non default GOTO.  */
-  count = 0;
-  for (i = begin; i < end; i++)
-    if (to_state[i] != default_state)
-      count++;
-
-  if (count == 0)
-    return;
-
-  /* Allocate room for non defaulted gotos.  */
-  froms[symno] = sp1 = sp = XCALLOC (base_t, count);
-  tos[symno] = sp2 = XCALLOC (base_t, count);
-
-  /* Store the state numbers of the non defaulted gotos.  */
-  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;
-}
-
-
-/*----------------------------------------------------------------.
-| Return `the' most common destination GOTO on SYMBOL (a nterm).  |
-`----------------------------------------------------------------*/
-
-static state_number_t
-default_goto (symbol_number_t symbol, short state_count[])
-{
-  state_number_t s;
-  int i;
-  goto_number_t m = goto_map[symbol];
-  goto_number_t n = goto_map[symbol + 1];
-  state_number_t default_state = (state_number_t) -1;
-  int max = 0;
-
-  if (m == n)
-    return (state_number_t) -1;
-
-  for (s = 0; s < nstates; s++)
-    state_count[s] = 0;
-
-  for (i = m; i < n; i++)
-    state_count[to_state[i]]++;
-
-  for (s = 0; s < nstates; s++)
-    if (state_count[s] > max)
-      {
-       max = state_count[s];
-       default_state = s;
-      }
-
-  return default_state;
-}
-
-
-/*-------------------------------------------------------------------.
-| 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.                                        |
-`-------------------------------------------------------------------*/
-

 static void
 static void

-goto_actions (void)
+prepare_actions (void)

 {
 {

-  symbol_number_t i;
-  state_number_t *yydefgoto = XMALLOC (state_number_t, nvars);
+  /* Figure out the actions for the specified state, indexed by
+     lookahead token type.  */

 
 

-  /* For a given nterm I, STATE_COUNT[S] is the number of times there
-     is a GOTO to S on I.  */
-  short *state_count = XCALLOC (short, nstates);
-  for (i = ntokens; i < nsyms; ++i)
-    {
-      state_number_t default_state = default_goto (i, state_count);
-      save_column (i, default_state);
-      yydefgoto[i - ntokens] = default_state;
-    }
+  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);
   muscle_insert_state_number_table ("defgoto", yydefgoto,
                                    yydefgoto[0], 1, nsyms - ntokens);

-  XFREE (state_count);
-  XFREE (yydefgoto);
-}
-
-
-/*------------------------------------------------------------------.
-| Compute ORDER, a reordering of vectors, in order to decide how to |
-| pack the actions and gotos information into yytable.              |
-`------------------------------------------------------------------*/
-
-static void
-sort_actions (void)
-{
-  int i;
-
-  nentries = 0;
-
-  for (i = 0; i < nvectors; i++)
-    if (tally[i] > 0)
-      {
-       int k;
-       int t = tally[i];
-       int w = width[i];
-       int 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++;
-      }
-}
-
-
-/* If VECTOR is a state which actions (reflected by FROMS, TOS, TALLY
-   and WIDTH of VECTOR) are common to a previous state, return this
-   state number.
-
-   In any other case, return -1.  */
-
-static state_number_t
-matching_state (vector_number_t vector)
-{
-  vector_number_t i = order[vector];
-  int t;
-  int w;
-  int prev;
-
-  /* If VECTOR is a nterm, return -1.  */
-  if (i >= (int) nstates)
-    return -1;
-
-  t = tally[i];
-  w = width[i];
-
-  for (prev = vector - 1; prev >= 0; prev--)
-    {
-      vector_number_t j = order[prev];
-      int k;
-      int match = 1;
-
-      /* Given how ORDER was computed, if the WIDTH or TALLY is
-        different, there cannot be a matching state.  */
-      if (width[j] != w || tally[j] != t)
-       return -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;
-}

 
 

-
-static base_t
-pack_vector (vector_number_t vector)
-{
-  vector_number_t i = order[vector];
-  int j;
-  int t = tally[i];
-  int loc = 0;
-  base_t *from = froms[i];
-  base_t *to = tos[i];
-  unsigned int *conflict_to = conflict_tos[i];
-
-  assert (t);
-
-  for (j = lowzero - from[0]; j < (int) table_size; j++)
-    {
-      int k;
-      int ok = 1;
-
-      for (k = 0; ok && k < t; k++)
-       {
-         loc = j + state_number_as_int (from[k]);
-         if (loc > (int) table_size)
-           table_grow (loc);
-
-         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];
-             if (glr_parser && conflict_to != NULL)
-               conflict_table[loc] = conflict_to[k];
-             check[loc] = from[k];
-           }
-
-         while (table[lowzero] != 0)
-           lowzero++;
-
-         if (loc > high)
-           high = loc;
-
-         if (j < BASE_MIN || BASE_MAX < j)
-           fatal ("base_t too small to hold %d\n", j);
-         return j;
-       }
-    }
-#define pack_vector_succeeded 0
-  assert (pack_vector_succeeded);
-  return 0;
-}
-
-
-/*-------------------------------------------------------------.
-| Remap the negative infinite in TAB from NINF to the greatest |
-| possible smallest value.  Return it.                         |
-|                                                              |
-| In most case this allows us to use shorts instead of ints in |
-| parsers.                                                     |
-`-------------------------------------------------------------*/
-
-static base_t
-table_ninf_remap (base_t tab[], size_t size, base_t ninf)
-{
-  base_t res = 0;
-  size_t i;
-
-  for (i = 0; i < size; i++)
-    if (tab[i] < res && tab[i] != ninf)
-      res = base[i];
-
-  --res;
-
-  for (i = 0; i < size; i++)
-    if (tab[i] == ninf)
-      tab[i] = res;
-
-  return res;
-}
-
-static void
-pack_table (void)
-{
-  int i;
-
-  base = XCALLOC (base_t, nvectors);
-  pos = XCALLOC (base_t, nentries);
-  table = XCALLOC (base_t, table_size);
-  if (glr_parser)
-    conflict_table = XCALLOC (unsigned int, table_size);
-  check = XCALLOC (base_t, table_size);
-
-  lowzero = 0;
-  high = 0;
-
-  for (i = 0; i < nvectors; i++)
-    base[i] = BASE_MIN;
-
-  for (i = 0; i < (int) table_size; i++)
-    check[i] = -1;
-
-  for (i = 0; i < nentries; i++)
-    {
-      state_number_t state = matching_state (i);
-      base_t place;
-
-      if (state < 0)
-       /* A new set of state actions, or a nonterminal.  */
-       place = pack_vector (i);
-      else
-       /* Action of I were already coded for STATE.  */
-       place = base[state];
-
-      pos[i] = place;
-      base[order[i]] = place;
-    }
-
-  /* Use the greatest possible negative infinites.  */
-  base_ninf = table_ninf_remap (base, nvectors, BASE_MIN);
-  table_ninf = table_ninf_remap (table, high + 1, ACTION_MIN);
-
-  for (i = 0; i < nvectors; i++)
-    {
-      XFREE (froms[i]);
-      XFREE (tos[i]);
-      XFREE (conflict_tos[i]);
-    }
-
-  free (froms);
-  free (tos);
-  free (conflict_tos);
-  free (pos);
-}
-
-
-/* the following functions output yytable, yycheck, yyconflp, yyconfl,
-   and the vectors whose elements index the portion starts.  */
-
-static void
-output_base (void)
-{

   /* Output PACT. */
   muscle_insert_base_table ("pact", base,
                             base[0], 1, nstates);
   /* Output PACT. */
   muscle_insert_base_table ("pact", base,
                             base[0], 1, nstates);


@@ -1245,97 +464,28 @@ output_base (void)
   /* Output PGOTO. */
   muscle_insert_base_table ("pgoto", base,
                             base[nstates], nstates + 1, nvectors);
   /* Output PGOTO. */
   muscle_insert_base_table ("pgoto", base,
                             base[nstates], nstates + 1, nvectors);

-  XFREE (base);
-}

 
 

-
-static void
-output_table (void)
-{

   muscle_insert_base_table ("table", table,
                            table[0], 1, high + 1);
   MUSCLE_INSERT_INT ("table_ninf", table_ninf);
   muscle_insert_base_table ("table", table,
                            table[0], 1, high + 1);
   MUSCLE_INSERT_INT ("table_ninf", table_ninf);

-  XFREE (table);
-}
-
-
-static void
-output_conflicts (void)
-{
-  /* 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
-     avoid accidents by not writing them out in that case. */
-  if (! glr_parser)
-    return;
-
-  muscle_insert_unsigned_int_table ("conflict_list_heads", conflict_table,
-                                   conflict_table[0], 1, high+1);
-  muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list,
-                            conflict_list[0], 1, conflict_list_cnt);
-
-  XFREE (conflict_table);
-  XFREE (conflict_list);
-}
-

 
 

-static void
-output_check (void)
-{

   muscle_insert_base_table ("check", check,
                            check[0], 1, high + 1);
   muscle_insert_base_table ("check", check,
                            check[0], 1, high + 1);

-  XFREE (check);
-}

 
 

+  /* 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.

 
 

-/*-----------------------------------------------------------------.
-| Compute and output yydefact, yydefgoto, yypact, yypgoto, yytable |
-| and yycheck.                                                     |
-`-----------------------------------------------------------------*/
-
-static void
-prepare_actions (void)
-{
-  /* That's a poor way to make sure the sizes are properly corelated,
-     in particular the signedness is not taking into account, but it's
-     not useless.  */
-  assert (sizeof (nvectors) >= sizeof (nstates));
-  assert (sizeof (nvectors) >= sizeof (nvars));
-
-  nvectors = state_number_as_int (nstates) + nvars;
-
-  froms = XCALLOC (base_t *, nvectors);
-  tos = XCALLOC (base_t *, nvectors);
-  conflict_tos = XCALLOC (unsigned int *, nvectors);
-  tally = XCALLOC (short, nvectors);
-  width = XCALLOC (base_t, nvectors);
-
-  token_actions ();
-  bitsetv_free (LA);
-  free (LArule);
-
-  goto_actions ();
-  XFREE (goto_map + ntokens);
-  XFREE (from_state);
-  XFREE (to_state);
-
-  order = XCALLOC (vector_number_t, nvectors);
-  sort_actions ();
-  pack_table ();
-  free (order);
-
-  free (tally);
-  free (width);
-
-  output_base ();
-  output_table ();
-  output_conflicts ();
-
-  output_check ();
+     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.  |
 \f
 /*---------------------------.
 | Call the skeleton parser.  |


@@ -1344,101 +494,180 @@ prepare_actions (void)
 static void
 output_skeleton (void)
 {
 static void
 output_skeleton (void)
 {

-  /* Store the definition of all the muscles. */
-  const char *tempdir = getenv ("TMPDIR");
-  char *tempfile = NULL;
-  FILE *out = NULL;
-  int fd;
-
-  if (tempdir == NULL)
-    tempdir = DEFAULT_TMPDIR;
-  tempfile = xmalloc (strlen (tempdir) + 11);
-  sprintf (tempfile, "%s/bsnXXXXXX", tempdir);
-  fd = mkstemp (tempfile);
-  if (fd == -1)
-    error (EXIT_FAILURE, errno, "%s", tempfile);
-
-  out = fdopen (fd, "w");
-  if (out == NULL)
-    error (EXIT_FAILURE, errno, "%s", tempfile);
-
-  /* There are no comments, especially not `#': we do want M4 expansion
-     after `#': think of CPP macros!  */
-  fputs ("m4_changecom()\n", out);
+  FILE *in;
+  FILE *out;
+  int filter_fd[2];
+  char const *argv[9];
+  pid_t pid;
+
+  /* Compute the names of the package data dir and skeleton files.  */
+  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);
+
+  /* Test whether m4sugar.m4 is readable, to check for proper
+     installation.  A faulty installation can cause deadlock, so a
+     cheap sanity check is worthwhile.  */
+  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);
+
+  /* Some future version of GNU M4 (most likely 1.6) may treat the -dV in a
+     position-dependent manner.  Keep it as the first argument so that all
+     files are traced.
+
+     See the thread starting at
+     <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
+     for details.  */
+  {
+    int i = 0;
+    argv[i++] = m4;
+    argv[i++] = "-I";
+    argv[i++] = pkgdatadir;
+    if (trace_flag & trace_m4)
+      argv[i++] = "-dV";
+    argv[i++] = full_m4sugar;
+    argv[i++] = "-";
+    argv[i++] = full_m4bison;
+    argv[i++] = full_skeleton;
+    argv[i++] = NULL;
+  }
+  /* When POSIXLY_CORRECT is set, some future versions of GNU M4 (most likely
+     2.0) may drop some of the GNU extensions that Bison's skeletons depend
+     upon.  So that the next release of Bison is forward compatible with those
+     future versions of GNU M4, we unset POSIXLY_CORRECT here.
+
+     FIXME: A user might set POSIXLY_CORRECT to affect processes run from
+     macros like m4_syscmd in a custom skeleton.  For now, Bison makes no
+     promises about the behavior of custom skeletons, so this scenario is not a
+     concern.  However, we eventually want to eliminate this shortcoming.  The
+     next release of GNU M4 (1.4.12 or 1.6) will accept the -g command-line
+     option as a no-op, and later releases will accept it to indicate that
+     POSIXLY_CORRECT should be ignored.  Once the GNU M4 versions that accept
+     -g are pervasive, Bison should use -g instead of unsetting
+     POSIXLY_CORRECT.
+
+     See the thread starting at
+     <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
+     for details.  */
+  unsetenv ("POSIXLY_CORRECT");
+  init_subpipe ();
+  pid = create_subpipe (argv, filter_fd);
+  free (full_m4sugar);
+  free (full_m4bison);
+  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);
 
   fputs ("m4_init()\n", out);
 

-  actions_output (out);
+  type_names_output (out);
+  user_actions_output (out);

   merger_output (out);
   token_definitions_output (out);
   merger_output (out);
   token_definitions_output (out);

-  symbol_destructors_output (out);
-  symbol_printers_output (out);
+  symbol_code_props_output (out, "destructors", &symbol_destructor_get);
+  symbol_code_props_output (out, "printers", &symbol_printer_get);

 
   muscles_m4_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);
 
   xfclose (out);
 

+  /* Read and process m4's output.  */

   timevar_push (TV_M4);
   timevar_push (TV_M4);

-  m4_invoke (tempfile);
+  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);
   timevar_pop (TV_M4);

-
-  /* If `debugging', keep this file alive. */
-  if (!(trace_flag & trace_tools))
-    unlink (tempfile);
-
-  free (tempfile);

 }
 
 static void
 prepare (void)
 {
 }
 
 static void
 prepare (void)
 {

-  /* Flags. */
-  MUSCLE_INSERT_INT ("locations_flag", locations_flag);
-  MUSCLE_INSERT_INT ("defines_flag", defines_flag);
-  MUSCLE_INSERT_INT ("error_verbose", error_verbose);
-  MUSCLE_INSERT_INT ("pure", pure_parser);
-  MUSCLE_INSERT_INT ("debug", debug_flag);
-
-  /* FIXME: This is wrong: the muscles should decide whether they hold
-     a copy or not, but the situation is too obscure currently.  */
-  MUSCLE_INSERT_STRING ("prefix", spec_name_prefix ? spec_name_prefix : "yy");
-  MUSCLE_INSERT_STRING ("output_infix", output_infix ? output_infix : "");
-  MUSCLE_INSERT_STRING ("output_prefix", short_base_name);
-  MUSCLE_INSERT_STRING ("output_parser_name", parser_file_name);
-  MUSCLE_INSERT_STRING ("output_header_name", spec_defines_file);
-
-  /* Symbols. */
-  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);
-
-  /* Rules. */
-  MUSCLE_INSERT_INT ("rules_number", nrules);
-
-  /* States. */
-  MUSCLE_INSERT_INT ("last", high);
-  MUSCLE_INSERT_INT ("final_state_number", final_state->number);
-  MUSCLE_INSERT_INT ("states_number", nstates);
-
-  /* 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));
+  /* 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;

 
 

-  /* Find the right skeleton file.  */
-  if (!skeleton)
-    {
-      if (glr_parser)
-       skeleton = "glr.c";
-      else
-       skeleton = "yacc.c";
-    }
+  /* 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;

 
 

-  /* Parse the skeleton file and output the needed parsers.  */
-  muscle_insert ("skeleton", 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 ());
+  }

 }
 
 
 }
 
 


@@ -1451,12 +680,10 @@ output (void)
 {
   obstack_init (&format_obstack);
 
 {
   obstack_init (&format_obstack);
 

-  prepare_tokens ();
+  prepare_symbols ();

   prepare_rules ();
   prepare_states ();
   prepare_rules ();
   prepare_states ();

-  timevar_push (TV_ACTIONS);

   prepare_actions ();
   prepare_actions ();

-  timevar_pop (TV_ACTIONS);

 
   prepare ();
 
 
   prepare ();
 


@@ -1464,6 +691,11 @@ output (void)
   output_skeleton ();
 
   obstack_free (&format_obstack, NULL);
   output_skeleton ();
 
   obstack_free (&format_obstack, NULL);

-  obstack_free (&pre_prologue_obstack, NULL);
-  obstack_free (&post_prologue_obstack, NULL);
+}
+
+char const *
+compute_pkgdatadir (void)
+{
+  char const *pkgdatadir = getenv ("BISON_PKGDATADIR");
+  return pkgdatadir ? pkgdatadir : PKGDATADIR;

 }
 }