X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/342b8b6e2156e923797745af2da2596e3086ccd5..b0299a2ebb1a000b67d23d3cfecb52f699dd734a:/src/output.c

diff --git a/src/output.c b/src/output.c
index 953f7017..b813b537 100644
--- a/src/output.c
+++ b/src/output.c
@@ -1,5 +1,6 @@
 /* Output the generated parsing program for bison,
-   Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002
+   Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -19,80 +20,78 @@
    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.
+/* The parser tables consist of these tables.  Marked ones needed only
+   for the semantic parser.  Double marked are output only if switches
+   are set.
 
-   yytranslate = vector mapping yylex's token numbers into bison's token
-   numbers.
+   YYTRANSLATE = vector mapping yylex's token numbers into bison's
+   token numbers.
 
-   ** yytname = vector of string-names indexed by bison token number
+   ++ YYTNAME = vector of string-names indexed by bison token number.
 
-   ** yytoknum = vector of yylex token numbers corresponding to entries
-   in yytname
+   ++ YYTOKNUM = vector of yylex token numbers corresponding to
+   entries in YYTNAME.
 
-   yyrline = vector of line-numbers of all rules.  For yydebug printouts.
+   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.
+   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.
+   YYPRHS[R] = index in YYRHS of first item for rule R.
 
-   yyr1[r] = symbol number of symbol that rule r derives.
+   YYR1[R] = symbol number of symbol that rule R derives.
 
-   yyr2[r] = number of symbols composing right hand side of rule r.
+   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.
+   + 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.
+   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.
+   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.
+   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 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.
+   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.
+   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.
+   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.
+   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.
+   Suppose that the portion of yytable starts at index P and the index
+   to be examined within the portion is I.  Then if YYCHECK[P+I] != I,
+   I is outside the bounds of what is actually allocated, and the
+   default (from YYDEFACT or YYDEFGOTO) should be used.  Otherwise,
+   YYTABLE[P+I] should be used.
 
-   YYFINAL = the state number of the termination state.
-   YYFLAG = most negative short int.  Used to flag ??
-   YYNTBASE = ntokens.
-*/
+   YYFINAL = the state number of the termination state.  YYFLAG = most
+   negative short int.  Used to flag ??  */
 
 #include "system.h"
-#include "obstack.h"
+#include "bitsetv.h"
 #include "quotearg.h"
+#include "error.h"
 #include "getargs.h"
 #include "files.h"
 #include "gram.h"
@@ -101,10 +100,16 @@
 #include "output.h"
 #include "lalr.h"
 #include "reader.h"
+#include "symtab.h"
 #include "conflicts.h"
 #include "muscle_tab.h"
 
-extern void berror PARAMS((const char *));
+/* From lib/readpipe.h.  */
+FILE *readpipe PARAMS ((const char *, ...));
+
+/* From src/scan-skel.l. */
+int skel_lex PARAMS ((void));
+extern FILE *skel_in;
 
 static int nvectors;
 static int nentries;
@@ -123,7 +128,24 @@ static int lowzero;
 static int high;
 
 struct obstack muscle_obstack;
-struct obstack output_obstack;
+static struct obstack format_obstack;
+
+int error_verbose = 0;
+
+/* Returns the number of lines of S.  */
+size_t
+get_lines_number (const char *s)
+{
+  size_t lines = 0;
+
+  size_t i;
+  for (i = 0; s[i]; ++i)
+    if (s[i] == '\n')
+      ++lines;
+
+  return lines;
+}
+
 
 /* FIXME. */
 
@@ -131,8 +153,8 @@ static inline void
 output_table_data (struct obstack *oout,
 		   short *table_data,
 		   short first,
-		   short begin,
-		   short end)
+		   int begin,
+		   int end)
 {
   int i;
   int j = 1;
@@ -154,145 +176,138 @@ output_table_data (struct obstack *oout,
 }
 
 
+/*-----------------------------------------------------------------.
+| Prepare the muscles related to the tokens: translate, tname, and |
+| toknum.                                                          |
+`-----------------------------------------------------------------*/
+
 static void
-output_token_translations (void)
+prepare_tokens (void)
 {
-  output_table_data (&output_obstack, token_translations,
+  output_table_data (&format_obstack, token_translations,
 		     0, 1, max_user_token_number + 1);
-  muscle_insert ("translate", obstack_finish (&output_obstack));
+  muscle_insert ("translate", obstack_finish (&format_obstack));
   XFREE (token_translations);
+
+  {
+    int i;
+    int j = 0;
+    for (i = 0; i < nsyms; i++)
+      {
+	/* Be sure not to use twice the same quotearg slot. */
+	const char *cp =
+	  quotearg_n_style (1, c_quoting_style,
+			    quotearg_style (escape_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)
+	  {
+	    obstack_sgrow (&format_obstack, "\n  ");
+	    j = 2;
+	  }
+
+	obstack_sgrow (&format_obstack, cp);
+	obstack_sgrow (&format_obstack, ", ");
+	j += strsize;
+      }
+    /* Add a NULL entry to list of tokens (well, 0, as NULL might not be
+       defined).  */
+    obstack_sgrow (&format_obstack, "0");
+
+    /* Finish table and store. */
+    obstack_1grow (&format_obstack, 0);
+    muscle_insert ("tname", obstack_finish (&format_obstack));
+  }
+
+    /* Output YYTOKNUM. */
+  {
+    int i;
+    short *values = XCALLOC (short, ntokens + 1);
+    for (i = 0; i < ntokens + 1; ++i)
+      values[i] = symbols[i]->user_token_number;
+    output_table_data (&format_obstack, values,
+		       0, 1, ntokens + 1);
+    muscle_insert ("toknum", obstack_finish (&format_obstack));
+    free (values);
+  }
 }
 
 
+/*-------------------------------------------------------------.
+| Prepare the muscles related to the rules: rhs, prhs, r1, r2, |
+| rline.                                                       |
+`-------------------------------------------------------------*/
+
 static void
-output_gram (void)
+prepare_rules (void)
 {
-  output_table_data (&output_obstack, rrhs,
-		     0, 1, nrules + 1);
-  muscle_insert ("prhs", obstack_finish (&output_obstack));
+  short *rhsp;
+  int r;
+  int i = 0;
+  short *rhs = XMALLOC (short, nritems);
+  short *prhs = XMALLOC (short, nrules + 1);
+  short *r1 = XMALLOC (short, nrules + 1);
+  short *r2 = XMALLOC (short, nrules + 1);
+  short *rline = XMALLOC (short, nrules + 1);
+
+  for (r = 1; r < nrules + 1; ++r)
+    {
+      /* 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].line;
+    }
+  assert (i == nritems);
 
-  {
-    size_t yyrhs_size = 1;
-    short *yyrhs, *sp;
-    int i;
+  output_table_data (&format_obstack, rhs, ritem[0], 1, nritems);
+  muscle_insert ("rhs", obstack_finish (&format_obstack));
 
-    for (sp = ritem + 1; *sp; sp++)
-      ++yyrhs_size;
-    yyrhs = XMALLOC (short, yyrhs_size);
+  output_table_data (&format_obstack, prhs, 0, 1, nrules + 1);
+  muscle_insert ("prhs", obstack_finish (&format_obstack));
 
-    for (sp = ritem + 1, i = 1; *sp; ++sp, ++i)
-      yyrhs[i] = *sp > 0 ? *sp : 0;
+  output_table_data (&format_obstack, rline, 0, 1, nrules + 1);
+  muscle_insert ("rline", obstack_finish (&format_obstack));
 
-    output_table_data (&output_obstack, yyrhs,
-		       ritem[0], 1, yyrhs_size);
-    muscle_insert ("rhs", obstack_finish (&output_obstack));
+  output_table_data (&format_obstack, r1, 0, 1, nrules + 1);
+  muscle_insert ("r1", obstack_finish (&format_obstack));
 
-    XFREE (yyrhs);
-  }
+  output_table_data (&format_obstack, r2, 0, 1, nrules + 1);
+  muscle_insert ("r2", obstack_finish (&format_obstack));
 
-#if 0
-  if (!semantic_parser && !no_parser_flag)
-    obstack_sgrow (&table_obstack, "\n#endif\n");
-#endif
+  free (rhs);
+  free (prhs);
+  free (r2);
 }
 
+/*--------------------------------------------.
+| Prepare the muscles related to the states.  |
+`--------------------------------------------*/
 
 static void
-output_stos (void)
+prepare_states (void)
 {
-  output_table_data (&output_obstack, accessing_symbol,
+  size_t i;
+  short *values = (short *) alloca (sizeof (short) * nstates);
+  for (i = 0; i < nstates; ++i)
+    values[i] = states[i]->accessing_symbol;
+  output_table_data (&format_obstack, values,
 		     0, 1, nstates);
-  muscle_insert ("stos", obstack_finish (&output_obstack));
+  muscle_insert ("stos", obstack_finish (&format_obstack));
 }
 
 
-static void
-output_rule_data (void)
-{
-  int i;
-  int j;
-  short *short_tab = NULL;
-
-  output_table_data (&output_obstack, rline,
-		     0, 1, nrules + 1);
-  muscle_insert ("rline", obstack_finish (&output_obstack));
-
-  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_sgrow (&output_obstack, "\n  ");
-	  j = 2;
-	}
-
-      obstack_1grow (&output_obstack, '\"');
-      for (p = tags[i]; p && *p; p++)
-	{
-	  if (*p == '"' || *p == '\\')
-	    obstack_fgrow1 (&output_obstack, "\\%c", *p);
-	  else if (*p == '\n')
-	    obstack_sgrow (&output_obstack, "\\n");
-	  else if (*p == '\t')
-	    obstack_sgrow (&output_obstack, "\\t");
-	  else if (*p == '\b')
-	    obstack_sgrow (&output_obstack, "\\b");
-	  else if (*p < 040 || *p >= 0177)
-	    obstack_fgrow1 (&output_obstack, "\\%03o", *p);
-	  else
-	    obstack_1grow (&output_obstack, *p);
-	}
-
-      obstack_sgrow (&output_obstack, "\", ");
-      j += strsize;
-    }
-  /* add a NULL entry to list of tokens */
-  obstack_sgrow (&output_obstack, "NULL");
-
-  /* Finish table and store. */
-  obstack_1grow (&output_obstack, 0);
-  muscle_insert ("tname", obstack_finish (&output_obstack));
-
-  /* Output YYTOKNUM. */
-  output_table_data (&output_obstack, user_toknums,
-		     0, 1, ntokens + 1);
-  muscle_insert ("toknum", obstack_finish (&output_obstack));
-
-  /* Output YYR1. */
-  output_table_data (&output_obstack, rlhs,
-		     0, 1, nrules + 1);
-  muscle_insert ("r1", obstack_finish (&output_obstack));
-  XFREE (rlhs + 1);
-
-  /* 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_table_data (&output_obstack, short_tab,
-		     0, 1, nrules + 1);
-  muscle_insert ("r2", obstack_finish (&output_obstack));
-  XFREE (short_tab);
-
-  XFREE (rrhs + 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      |
@@ -308,137 +323,84 @@ output_rule_data (void)
 `------------------------------------------------------------------*/
 
 static int
-action_row (int state)
+action_row (state_t *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 */
+  int default_rule = 0;
+  reductions *redp = state->reductions;
+  shifts *shiftp = state->shifts;
+  errs *errp = state->errs;
+  /* set nonzero to inhibit having any default reduction */
+  int nodefault = 0;
 
   for (i = 0; i < ntokens; i++)
     actrow[i] = 0;
 
-  default_rule = 0;
-  nreds = 0;
-  redp = reduction_table[state];
-
-  if (redp)
+  if (redp->nreds >= 1)
     {
-      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++;
-		    }
-		}
-	    }
-	}
+      int j;
+      /* 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 */
+	for (j = 0; j < ntokens; j++)
+	  /* and record this rule as the rule to use if that
+	     token follows.  */
+	  if (bitset_test (LA[state->lookaheadsp + i], j))
+	    actrow[j] = -LArule[state->lookaheadsp + i]->number;
     }
 
-  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)
+  for (i = 0; i < shiftp->nshifts; i++)
     {
-      k = shiftp->nshifts;
-
-      for (i = 0; i < k; i++)
-	{
-	  shift_state = shiftp->shifts[i];
-	  if (!shift_state)
-	    continue;
+      int symbol;
+      int shift_state = shiftp->shifts[i];
+      if (!shift_state)
+	continue;
 
-	  symbol = accessing_symbol[shift_state];
+      symbol = states[shift_state]->accessing_symbol;
 
-	  if (ISVAR (symbol))
-	    break;
+      if (ISVAR (symbol))
+	break;
 
-	  actrow[symbol] = shift_state;
+      actrow[symbol] = shift_state;
 
-	  /* Do not use any default reduction if there is a shift for
-	     error */
-	  if (symbol == error_token_number)
-	    nodefault = 1;
-	}
+      /* 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)
+  for (i = 0; i < errp->nerrs; i++)
     {
-      k = errp->nerrs;
-
-      for (i = 0; i < k; i++)
-	{
-	  symbol = errp->errs[i];
-	  actrow[symbol] = MINSHORT;
-	}
+      int 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 (redp->nreds >= 1 && !nodefault)
     {
-      if (consistent[state])
+      if (state->consistent)
 	default_rule = redp->rules[0];
       else
 	{
-	  max = 0;
-	  for (i = m; i < n; i++)
+	  int max = 0;
+	  for (i = 0; i < state->nlookaheads; i++)
 	    {
-	      count = 0;
-	      rule = -LAruleno[i];
+	      int count = 0;
+	      int rule = -LArule[state->lookaheadsp + i]->number;
+	      int j;
 
 	      for (j = 0; j < ntokens; j++)
-		{
-		  if (actrow[j] == rule)
-		    count++;
-		}
+		if (actrow[j] == rule)
+		  count++;
 
 	      if (count > max)
 		{
@@ -452,11 +414,10 @@ action_row (int state)
 
 	  if (max > 0)
 	    {
+	      int j;
 	      for (j = 0; j < ntokens; j++)
-		{
-		  if (actrow[j] == default_rule)
-		    actrow[j] = 0;
-		}
+		if (actrow[j] == default_rule)
+		  actrow[j] = 0;
 
 	      default_rule = -default_rule;
 	    }
@@ -467,11 +428,9 @@ action_row (int state)
      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;
-      }
+    for (i = 0; i < ntokens; i++)
+      if (actrow[i] == MINSHORT)
+	actrow[i] = 0;
 
   return default_rule;
 }
@@ -488,10 +447,8 @@ save_row (int state)
 
   count = 0;
   for (i = 0; i < ntokens; i++)
-    {
-      if (actrow[i] != 0)
-	count++;
-    }
+    if (actrow[i] != 0)
+      count++;
 
   if (count == 0)
     return;
@@ -500,13 +457,11 @@ save_row (int state)
   tos[state] = sp2 = XCALLOC (short, count);
 
   for (i = 0; i < ntokens; i++)
-    {
-      if (actrow[i] != 0)
-	{
-	  *sp1++ = i;
-	  *sp2++ = actrow[i];
-	}
-    }
+    if (actrow[i] != 0)
+      {
+	*sp1++ = i;
+	*sp2++ = actrow[i];
+      }
 
   tally[state] = count;
   width[state] = sp1[-1] - sp[0] + 1;
@@ -524,56 +479,123 @@ save_row (int state)
 static void
 token_actions (void)
 {
-  int i;
+  size_t i;
   short *yydefact = XCALLOC (short, nstates);
 
   actrow = XCALLOC (short, ntokens);
   for (i = 0; i < nstates; ++i)
     {
-      yydefact[i] = action_row (i);
+      yydefact[i] = action_row (states[i]);
       save_row (i);
     }
 
-  output_table_data (&output_obstack, yydefact,
+  output_table_data (&format_obstack, yydefact,
 		     yydefact[0], 1, nstates);
-  muscle_insert ("defact", obstack_finish (&output_obstack));
+  muscle_insert ("defact", obstack_finish (&format_obstack));
 
   XFREE (actrow);
   XFREE (yydefact);
 }
 
 
-static void
-free_shifts (void)
+/*-----------------------------.
+| Output the actions to OOUT.  |
+`-----------------------------*/
+
+void
+actions_output (FILE *out)
 {
-  shifts *sp, *sptmp;	/* JF derefrenced freed ptr */
+  int rule;
+  for (rule = 1; rule < nrules + 1; ++rule)
+    if (rules[rule].action)
+      {
+	fprintf (out, "  case %d:\n", rule);
+
+	if (!no_lines_flag)
+	  fprintf (out, muscle_find ("linef"),
+		   rules[rule].action_line,
+		   quotearg_style (c_quoting_style,
+				   muscle_find ("filename")));
+	/* As a Bison extension, add the ending semicolon.  Since some
+	   Yacc don't do that, help people using bison as a Yacc
+	   finding their missing semicolons.  */
+	fprintf (out, "{ %s%s }\n    break;\n\n",
+		 rules[rule].action,
+		 yacc_flag ? ";" : "");
+      }
+}
 
-  XFREE (shift_table);
 
-  for (sp = first_shift; sp; sp = sptmp)
-    {
-      sptmp = sp->next;
-      XFREE (sp);
-    }
+/*----------------------------.
+| Output the guards to OOUT.  |
+`----------------------------*/
+
+void
+guards_output (FILE *out)
+{
+  int rule;
+  for (rule = 1; rule < nrules + 1; ++rule)
+    if (rules[rule].guard)
+      {
+	fprintf (out, "  case %d:\n", rule);
+
+	if (!no_lines_flag)
+	  fprintf (out, muscle_find ("linef"),
+		   rules[rule].guard_line,
+		   quotearg_style (c_quoting_style,
+				   muscle_find ("filename")));
+	fprintf (out, "{ %s; }\n    break;\n\n",
+		 rules[rule].guard);
+      }
 }
 
 
-static void
-free_reductions (void)
+/*---------------------------------------.
+| Output the tokens definition to OOUT.  |
+`---------------------------------------*/
+
+void
+token_definitions_output (FILE *out)
 {
-  reductions *rp, *rptmp;	/* JF fixed freed ptr */
+  int i;
+  int first = 1;
+  for (i = 0; i < ntokens; ++i)
+    {
+      bucket *symbol = symbols[i];
+      int number = symbol->user_token_number;
+
+      if (number == SALIAS)
+	continue;
+      /* Skip error token.  */
+      if (symbol->number == error_token_number)
+	continue;
+      if (symbol->tag[0] == '\'')
+	continue;               /* skip literal character */
+      if (symbol->tag[0] == '\"')
+	{
+	  /* use literal string only if given a symbol with an alias */
+	  if (symbol->alias)
+	    symbol = symbol->alias;
+	  else
+	    continue;
+	}
 
-  XFREE (reduction_table);
+      /* Don't #define nonliteral tokens whose names contain periods
+	 or '$' (as does the default value of the EOF token).  */
+      if (strchr (symbol->tag, '.') || strchr (symbol->tag, '$'))
+	continue;
 
-  for (rp = first_reduction; rp; rp = rptmp)
-    {
-      rptmp = rp->next;
-      XFREE (rp);
+      fprintf (out, "%s  [[[%s]], [%d]]",
+	       first ? "" : ",\n", symbol->tag, number);
+      if (semantic_parser)
+	/* FIXME: This is probably wrong, and should be just as
+	   above. --akim.  */
+	fprintf (out, "# define T%s\t%d\n", symbol->tag, symbol->number);
+      first = 0;
     }
 }
 
 
-
 static void
 save_column (int symbol, int default_state)
 {
@@ -582,34 +604,28 @@ save_column (int symbol, int default_state)
   short *sp1;
   short *sp2;
   int count;
-  int symno;
+  int symno = symbol - ntokens + nstates;
 
   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 (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];
-	}
-    }
+    if (to_state[i] != default_state)
+      {
+	*sp1++ = from_state[i];
+	*sp2++ = to_state[i];
+      }
 
   tally[symno] = count;
   width[symno] = sp1[-1] - sp[0] + 1;
@@ -618,14 +634,11 @@ save_column (int symbol, int default_state)
 static int
 default_goto (int symbol)
 {
-  int i;
-  int m;
-  int n;
-  int default_state;
-  int max;
-
-  m = goto_map[symbol];
-  n = goto_map[symbol + 1];
+  size_t i;
+  size_t m = goto_map[symbol];
+  size_t n = goto_map[symbol + 1];
+  int default_state = -1;
+  int max = 0;
 
   if (m == n)
     return -1;
@@ -636,17 +649,12 @@ default_goto (int symbol)
   for (i = m; i < n; i++)
     state_count[to_state[i]]++;
 
-  max = 0;
-  default_state = -1;
-
   for (i = 0; i < nstates; i++)
-    {
-      if (state_count[i] > max)
-	{
-	  max = state_count[i];
-	  default_state = i;
-	}
-    }
+    if (state_count[i] > max)
+      {
+	max = state_count[i];
+	default_state = i;
+      }
 
   return default_state;
 }
@@ -675,9 +683,9 @@ goto_actions (void)
       yydefgoto[i - ntokens] = default_state;
     }
 
-  output_table_data (&output_obstack, yydefgoto,
+  output_table_data (&format_obstack, yydefgoto,
 		     yydefgoto[0], 1, nsyms - ntokens);
-  muscle_insert ("defgoto", obstack_finish (&output_obstack));
+  muscle_insert ("defgoto", obstack_finish (&format_obstack));
 
   XFREE (state_count);
   XFREE (yydefgoto);
@@ -691,51 +699,42 @@ static void
 sort_actions (void)
 {
   int i;
-  int j;
-  int k;
-  int t;
-  int w;
 
   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;
+    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))
+	  j--;
 
-	  while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
-	    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];
+	for (k = nentries - 1; k > j; k--)
+	  order[k + 1] = order[k];
 
-	  order[j + 1] = i;
-	  nentries++;
-	}
-    }
+	order[j + 1] = i;
+	nentries++;
+      }
 }
 
 
 static int
 matching_state (int vector)
 {
-  int i;
-  int j;
-  int k;
+  int i = order[vector];
   int t;
   int w;
-  int match;
   int prev;
 
-  i = order[vector];
-  if (i >= nstates)
+  if (i >= (int) nstates)
     return -1;
 
   t = tally[i];
@@ -743,16 +742,16 @@ matching_state (int vector)
 
   for (prev = vector - 1; prev >= 0; prev--)
     {
-      j = order[prev];
+      int j = order[prev];
+      int k;
+      int match = 1;
+
       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 (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k])
+	  match = 0;
 
       if (match)
 	return j;
@@ -765,26 +764,19 @@ matching_state (int vector)
 static int
 pack_vector (int vector)
 {
-  int i;
+  int i = order[vector];
   int j;
-  int k;
-  int t;
+  int t = tally[i];
   int loc = 0;
-  int ok;
-  short *from;
-  short *to;
-
-  i = order[vector];
-  t = tally[i];
+  short *from = froms[i];
+  short *to = tos[i];
 
   assert (t);
 
-  from = froms[i];
-  to = tos[i];
-
   for (j = lowzero - from[0]; j < MAXTABLE; j++)
     {
-      ok = 1;
+      int k;
+      int ok = 1;
 
       for (k = 0; ok && k < t; k++)
 	{
@@ -797,10 +789,8 @@ pack_vector (int vector)
 	}
 
       for (k = 0; ok && k < vector; k++)
-	{
-	  if (pos[k] == j)
-	    ok = 0;
-	}
+	if (pos[k] == j)
+	  ok = 0;
 
       if (ok)
 	{
@@ -820,9 +810,9 @@ pack_vector (int vector)
 	  return j;
 	}
     }
-
-  berror ("pack_vector");
-  return 0;			/* JF keep lint happy */
+#define pack_vector_succeeded 0
+  assert (pack_vector_succeeded);
+  return 0;
 }
 
 
@@ -862,10 +852,8 @@ pack_table (void)
 
   for (i = 0; i < nvectors; i++)
     {
-      if (froms[i])
-	XFREE (froms[i]);
-      if (tos[i])
-	XFREE (tos[i]);
+      XFREE (froms[i]);
+      XFREE (tos[i]);
     }
 
   XFREE (froms);
@@ -880,14 +868,14 @@ static void
 output_base (void)
 {
   /* Output pact. */
-  output_table_data (&output_obstack, base,
+  output_table_data (&format_obstack, base,
 		     base[0], 1, nstates);
-  muscle_insert ("pact", obstack_finish (&output_obstack));
+  muscle_insert ("pact", obstack_finish (&format_obstack));
 
   /* Output pgoto. */
-  output_table_data (&output_obstack, base,
+  output_table_data (&format_obstack, base,
 		     base[nstates], nstates + 1, nvectors);
-  muscle_insert ("pgoto", obstack_finish (&output_obstack));
+  muscle_insert ("pgoto", obstack_finish (&format_obstack));
 
   XFREE (base);
 }
@@ -896,9 +884,9 @@ output_base (void)
 static void
 output_table (void)
 {
-  output_table_data (&output_obstack, table,
+  output_table_data (&format_obstack, table,
 		     table[0], 1, high + 1);
-  muscle_insert ("table", obstack_finish (&output_obstack));
+  muscle_insert ("table", obstack_finish (&format_obstack));
   XFREE (table);
 }
 
@@ -906,18 +894,21 @@ output_table (void)
 static void
 output_check (void)
 {
-  output_table_data (&output_obstack, check,
+  output_table_data (&format_obstack, check,
 		     check[0], 1, high + 1);
-  muscle_insert ("check", obstack_finish (&output_obstack));
+  muscle_insert ("check", obstack_finish (&format_obstack));
   XFREE (check);
 }
 
-/* compute and output yydefact, yydefgoto, yypact, yypgoto, yytable
-   and yycheck.  */
+/*-----------------------------------------------------------------.
+| Compute and output yydefact, yydefgoto, yypact, yypgoto, yytable |
+| and yycheck.                                                     |
+`-----------------------------------------------------------------*/
 
 static void
 output_actions (void)
 {
+  size_t i;
   nvectors = nstates + nvars;
 
   froms = XCALLOC (short *, nvectors);
@@ -926,12 +917,8 @@ output_actions (void)
   width = XCALLOC (short, nvectors);
 
   token_actions ();
-  free_shifts ();
-  free_reductions ();
-  XFREE (lookaheads);
-  XFREE (LA);
-  XFREE (LAruleno);
-  XFREE (accessing_symbol);
+  bitsetv_free (LA);
+  free (LArule);
 
   goto_actions ();
   XFREE (goto_map + ntokens);
@@ -945,122 +932,92 @@ output_actions (void)
   output_table ();
 
   output_check ();
-}
-
-
-/*------------------------------------------------------------.
-| Copy the parser code from SKEL_FILENAME into OOUT obstack.  |
-| and do the muscle substitution.                             |
-`------------------------------------------------------------*/
-
-static void
-output_parser (const char *skel_filename, struct obstack *oout)
-{
-  int c;
-  FILE *fskel;
-  size_t line;
-
-  fskel = xfopen (skel_filename, "r");
-
-  /* New output code.  */
-  line = 1;
-  c = getc (fskel);
-  while (c != EOF)
-    {
-      if (c != '%')
-	{
-	  if (c == '\n')
-	    ++line;
-	  obstack_1grow (oout, c);
-	  c = getc (fskel);
-	}
-      else if ((c = getc (fskel)) == '%')
-	{
-	  /* Read the muscle.  */
-	  const char *muscle_key = 0;
-	  const char *muscle_value = 0;
-
-	  while (isalnum (c = getc (fskel)) || c == '_')
-	    obstack_1grow (&muscle_obstack, c);
-	  obstack_1grow (&muscle_obstack, 0);
-
-	  /* Output the right value, or see if it's something special.  */
-	  muscle_key = obstack_finish (&muscle_obstack);
-	  muscle_value = muscle_find (muscle_key);
-	  if (muscle_value)
-	    obstack_sgrow (oout, muscle_value);
-	  else if (!strcmp (muscle_key, "line"))
-	    obstack_fgrow1 (oout, "%d", line + 1);
-	  else if (!strcmp (muscle_key, "input_line"))
-	    obstack_fgrow1 (oout, "%d", lineno);
-	  /* FIXME: Insert the code to recognize %%sub-skeleton for exemple.  */
-	  else
-	    {
-	      obstack_sgrow (oout, "%%");
-	      obstack_sgrow (oout, muscle_key);
-	    }
-	}
-      else
-	obstack_1grow (oout, '%');
-    }
-
-  /* End.  */
-  xfclose (fskel);
-}
-
-/*----------------------------------------.
-| Prepare the master parser to be output  |
-`----------------------------------------*/
 
-static void
-output_master_parser (void)
-{
-  if (!skeleton)
+  for (i = 0; i < nstates; ++i)
     {
-      if (semantic_parser)
-	skeleton = skeleton_find ("BISON_HAIRY", BISON_HAIRY);
-      else
-	skeleton = skeleton_find ("BISON_SIMPLE", BISON_SIMPLE);
+      free (states[i]->shifts);
+      XFREE (states[i]->reductions);
+      free (states[i]->errs);
+      free (states[i]);
     }
-  output_parser (skeleton, &table_obstack);
+  XFREE (states);
 }
 
+
+/*---------------------------.
+| Call the skeleton parser.  |
+`---------------------------*/
 
 static void
-free_itemsets (void)
+output_skeleton (void)
 {
-  core *cp, *cptmp;
-
-  XFREE (state_table);
-
-  for (cp = first_state; cp; cp = cptmp)
-    {
-      cptmp = cp->next;
-      XFREE (cp);
-    }
-}
-
-/* FIXME. */
-
-#define MUSCLE_INSERT_INT(Key, Value)				\
-{								\
-  obstack_fgrow1 (&muscle_obstack, "%d", Value);	       	\
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-}
-
-#define MUSCLE_INSERT_STRING(Key, Value)			\
-{								\
-  obstack_sgrow (&muscle_obstack, Value);			\
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-}
-
-#define MUSCLE_INSERT_PREFIX(Key, Value)	       			\
-{									\
-  obstack_fgrow2 (&muscle_obstack, "%s%s", spec_name_prefix, Value);	\
-  obstack_1grow (&muscle_obstack, 0);					\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	       	\
+  /* 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);
+  fputs ("m4_init()\n", out);
+
+  fputs ("m4_define([b4_actions], \n[[", out);
+  actions_output (out);
+  fputs ("]])\n\n", out);
+
+  fputs ("m4_define([b4_guards], \n[[", out);
+  guards_output (out);
+  fputs ("]])\n\n", out);
+
+  fputs ("m4_define([b4_tokens], \n[", out);
+  token_definitions_output (out);
+  fputs ("])\n\n", out);
+
+  muscles_m4_output (out);
+
+  fputs ("m4_wrap([m4_divert_pop(0)])\n", out);
+  fputs ("m4_divert_push(0)dnl\n", out);
+  xfclose (out);
+
+  /* Invoke m4 on the definition of the muscles, and the skeleton. */
+  {
+    const char *bison_pkgdatadir = getenv ("BISON_PKGDATADIR");
+    const char *m4 = getenv ("M4");
+    if (!m4)
+      m4 = M4;
+    if (!bison_pkgdatadir)
+      bison_pkgdatadir = PKGDATADIR;
+    if (trace_flag)
+      fprintf (stderr,
+	       "running: %s -I %s m4sugar/m4sugar.m4 %s %s\n",
+	       m4, bison_pkgdatadir, tempfile, skeleton);
+    skel_in = readpipe (m4,
+			"-I", bison_pkgdatadir,
+			"m4sugar/m4sugar.m4",
+			tempfile,
+			skeleton,
+			NULL);
+    if (!skel_in)
+      error (EXIT_FAILURE, errno, "cannot run m4");
+    skel_lex ();
+
+    /* If `debugging', keep this file alive. */
+    if (!trace_flag)
+      unlink (tempfile);
+  }
 }
 
 static void
@@ -1073,8 +1030,15 @@ prepare (void)
   MUSCLE_INSERT_INT ("debug", debug_flag);
   MUSCLE_INSERT_INT ("final", final_state);
   MUSCLE_INSERT_INT ("maxtok", max_user_token_number);
-  MUSCLE_INSERT_INT ("ntbase", ntokens);
-  MUSCLE_INSERT_INT ("verbose", 0);
+  MUSCLE_INSERT_INT ("error_verbose", error_verbose);
+  MUSCLE_INSERT_STRING ("prefix", spec_name_prefix ? spec_name_prefix : "yy");
+
+  /* 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 ("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);
 
   MUSCLE_INSERT_INT ("nnts", nvars);
   MUSCLE_INSERT_INT ("nrules", nrules);
@@ -1082,14 +1046,26 @@ prepare (void)
   MUSCLE_INSERT_INT ("ntokens", ntokens);
 
   MUSCLE_INSERT_INT ("locations_flag", locations_flag);
+  MUSCLE_INSERT_INT ("defines_flag", defines_flag);
 
-  /* We need to save the actions in the muscle %%action.  */
-  muscle_insert ("action", obstack_finish (&action_obstack));
+  /* Copy definitions in directive.  */
+  obstack_1grow (&attrs_obstack, 0);
+  muscle_insert ("prologue", obstack_finish (&attrs_obstack));
 
-  if (spec_name_prefix)
-    MUSCLE_INSERT_STRING ("prefix", spec_name_prefix);
+  /* Find the right skeleton file.  */
+  if (!skeleton)
+    {
+      if (semantic_parser)
+	skeleton = "bison.hairy";
+      else
+	skeleton = "bison.simple";
+    }
+
+  /* Parse the skeleton file and output the needed parsers.  */
+  muscle_insert ("skeleton", skeleton);
 }
 
+
 /*----------------------------------------------------------.
 | Output the parsing tables and the parser code to ftable.  |
 `----------------------------------------------------------*/
@@ -1097,29 +1073,20 @@ prepare (void)
 void
 output (void)
 {
-  obstack_init (&output_obstack);
-
-  free_itemsets ();
+  obstack_init (&format_obstack);
 
-  output_token_translations ();
-  output_gram ();
-
-  XFREE (ritem);
-  if (semantic_parser)
-    output_stos ();
-  output_rule_data ();
+  prepare_tokens ();
+  prepare_rules ();
+  prepare_states ();
   output_actions ();
 
-#if 0
-  if (!no_parser_flag) */
-#endif
   prepare ();
-  /* Copy definitions in directive.  */
-  muscle_insert ("prologue", obstack_finish (&attrs_obstack));
 
-  output_master_parser ();
+  /* Process the selected skeleton file.  */
+  output_skeleton ();
 
-  obstack_free (&muscle_obstack, 0);
-  obstack_free (&output_obstack, 0);
-  obstack_free (&action_obstack, 0);
+  obstack_free (&muscle_obstack, NULL);
+  obstack_free (&format_obstack, NULL);
+  obstack_free (&action_obstack, NULL);
+  obstack_free (&attrs_obstack, NULL);
 }