* src/reader.c (gensym): `gensym_count' is your own.

[bison.git] / src / reader.c

diff --git a/src/reader.c b/src/reader.c
index f0c0434ca7dc5ef7124919abb0aaed6fe451c2b5..fdd483aef6cf9ef2c0d18d8906134bca930402e5 100644 (file)
--- a/src/reader.c
+++ b/src/reader.c
@@ -1,5 +1,6 @@
 /* Input parser for bison
 /* Input parser for bison

-   Copyright (C) 1984, 86, 89, 92, 98, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1986, 1989, 1992, 1998, 2000
+   Free Software Foundation, Inc.

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


@@ -19,132 +20,56 @@
    Boston, MA 02111-1307, USA.  */
 
 
    Boston, MA 02111-1307, USA.  */
 
 

-/* Read in the grammar specification and record it in the format
-   described in gram.h.  All guards are copied into the fguard file
-   and all actions into faction, in each case forming the body of a C
-   function (yyguard or yyaction) which contains a switch statement to
-   decide which guard or action to execute.
-
-   The entry point is reader ().  */
-
-#include <stdio.h>

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

+#include "obstack.h"
+#include "quotearg.h"
+#include "quote.h"
+#include "getargs.h"

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

-#include "alloc.h"
+#include "xalloc.h"

 #include "symtab.h"
 #include "lex.h"
 #include "gram.h"
 #include "symtab.h"
 #include "lex.h"
 #include "gram.h"

-#include "machine.h"

 #include "complain.h"
 #include "complain.h"

-
-#define        LTYPESTR        "\
-\n\
-#ifndef YYLTYPE\n\
-typedef\n\
-  struct yyltype\n\
-\
-    {\n\
-      int timestamp;\n\
-      int first_line;\n\
-      int first_column;\
-\n\
-      int last_line;\n\
-      int last_column;\n\
-      char *text;\n\
-   }\n\
-\
-  yyltype;\n\
-\n\
-#define YYLTYPE yyltype\n\
-#endif\n\
-\n"
+#include "output.h"
+#include "reader.h"
+#include "conflicts.h"

 
 /* Number of slots allocated (but not necessarily used yet) in `rline'  */
 
 /* Number of slots allocated (but not necessarily used yet) in `rline'  */

-int rline_allocated;
-
-extern int definesflag;
-extern int nolinesflag;
-extern int noparserflag;
-extern int rawtoknumflag;
-extern bucket *symval;
-extern int numval;
-extern int expected_conflicts;
-extern char *token_buffer;
-extern int maxtoken;
-
-extern void init_lex PARAMS((void));
-extern char *grow_token_buffer PARAMS((char *));
-extern void tabinit PARAMS((void));
-extern void output_headers PARAMS((void));
-extern void output_trailers PARAMS((void));
-extern void free_symtab PARAMS((void));
-extern void open_extra_files PARAMS((void));
-extern char *printable_version PARAMS((int));
-extern void unlex PARAMS((int));
-
-extern int skip_white_space PARAMS((void));
-extern int parse_percent_token PARAMS((void));
-extern int lex PARAMS((void));
-
-typedef
-  struct symbol_list
-    {
-      struct symbol_list *next;
-      bucket *sym;
-      bucket *ruleprec;
-    }
-  symbol_list;
-
-
-void reader PARAMS((void));
-void reader_output_yylsp PARAMS((FILE *));
-void read_declarations PARAMS((void));
-void copy_definition PARAMS((void));
-void parse_token_decl PARAMS((int, int));
-void parse_start_decl PARAMS((void));
-void parse_type_decl PARAMS((void));
-void parse_assoc_decl PARAMS((int));
-void parse_union_decl PARAMS((void));
-void parse_expect_decl PARAMS((void));
-char *get_type_name PARAMS((int, symbol_list *));
-void copy_guard PARAMS((symbol_list *, int));
-void parse_thong_decl PARAMS((void));
-void copy_action PARAMS((symbol_list *, int));
-bucket *gensym PARAMS((void));
-void readgram PARAMS((void));
-void record_rule_line PARAMS((void));
-void packsymbols PARAMS((void));
-void output_token_defines PARAMS((FILE *));
-void packgram PARAMS((void));
-int read_signed_integer PARAMS((FILE *));
+static int rline_allocated;

 
 

-#if 0
-static int get_type PARAMS((void));
-#endif
+typedef struct symbol_list
+{
+  struct symbol_list *next;
+  bucket *sym;
+  bucket *ruleprec;
+}
+symbol_list;

 
 int lineno;
 
 int lineno;

-symbol_list *grammar;
-int start_flag;
-bucket *startval;

 char **tags;
 char **tags;

-int *user_toknums;
+short *user_toknums;
+static symbol_list *grammar;
+static int start_flag;
+static bucket *startval;

 
 /* Nonzero if components of semantic values are used, implying
    they must be unions.  */
 static int value_components_used;
 
 
 /* Nonzero if components of semantic values are used, implying
    they must be unions.  */
 static int value_components_used;
 

-static int typed;  /* nonzero if %union has been seen.  */
+/* Nonzero if %union has been seen.  */
+static int typed;

 
 

-static int lastprec;  /* incremented for each %left, %right or %nonassoc seen */
-
-static int gensym_count;  /* incremented for each generated symbol */
+/* Incremented for each %left, %right or %nonassoc seen */
+static int lastprec;

 
 static bucket *errtoken;
 static bucket *undeftoken;
 
 static bucket *errtoken;
 static bucket *undeftoken;

+\f

 
 

-/* Nonzero if any action or guard uses the @n construct.  */
-static int yylsp_needed;
-
+/*===================\
+| Low level lexing.  |
+\===================*/

 
 static void
 skip_to_char (int target)
 
 static void
 skip_to_char (int target)


@@ -156,23 +81,88 @@ skip_to_char (int target)
     complain (_("   Skipping to next %c"), target);
 
   do
     complain (_("   Skipping to next %c"), target);
 
   do

-    c = skip_white_space();
+    c = skip_white_space ();

   while (c != target && c != EOF);
   if (c != EOF)
   while (c != target && c != EOF);
   if (c != EOF)

-    ungetc(c, finput);
+    ungetc (c, finput);
+}
+
+
+/*---------------------------------------------------------.
+| Read a signed integer from STREAM and return its value.  |
+`---------------------------------------------------------*/
+
+static inline int
+read_signed_integer (FILE *stream)
+{
+  int c = getc (stream);
+  int sign = 1;
+  int n = 0;
+
+  if (c == '-')
+    {
+      c = getc (stream);
+      sign = -1;
+    }
+
+  while (isdigit (c))
+    {
+      n = 10 * n + (c - '0');
+      c = getc (stream);
+    }
+
+  ungetc (c, stream);
+
+  return sign * n;

 }
 }

+\f
+/*--------------------------------------------------------------.
+| Get the data type (alternative in the union) of the value for |
+| symbol N in rule RULE.                                        |
+`--------------------------------------------------------------*/
+
+static char *
+get_type_name (int n, symbol_list * rule)
+{
+  int i;
+  symbol_list *rp;
+
+  if (n < 0)
+    {
+      complain (_("invalid $ value"));
+      return NULL;
+    }
+
+  rp = rule;
+  i = 0;

 
 

+  while (i < n)
+    {
+      rp = rp->next;
+      if (rp == NULL || rp->sym == NULL)
+       {
+         complain (_("invalid $ value"));
+         return NULL;
+       }
+      i++;
+    }

 
 

-/* Dump the string from FINPUT to FOUTPUT.  MATCH is the delimiter of
-   the string (either ' or ").  */
+  return rp->sym->type_name;
+}
+\f
+/*------------------------------------------------------------.
+| Dump the string from FIN to OOUT if non null.  MATCH is the |
+| delimiter of the string (either ' or ").                    |
+`------------------------------------------------------------*/

 
 static inline void
 
 static inline void

-copy_string (FILE *finput, FILE *foutput, int match)
+copy_string (FILE *fin, struct obstack *oout, int match)

 {
   int c;
 
 {
   int c;
 

-  putc (match, foutput);
-  c = getc (finput);
+  obstack_1grow (oout, match);
+
+  c = getc (fin);

 
   while (c != match)
     {
 
   while (c != match)
     {


@@ -181,44 +171,68 @@ copy_string (FILE *finput, FILE *foutput, int match)
       if (c == '\n')
        {
          complain (_("unterminated string"));
       if (c == '\n')
        {
          complain (_("unterminated string"));

-         ungetc (c, finput);
+         ungetc (c, fin);

          c = match;            /* invent terminator */
          continue;
        }
 
          c = match;            /* invent terminator */
          continue;
        }
 

-      putc(c, foutput);
+      obstack_1grow (oout, c);

 
       if (c == '\\')
        {
 
       if (c == '\\')
        {

-         c = getc (finput);
+         c = getc (fin);

          if (c == EOF)
            fatal (_("unterminated string at end of file"));
          if (c == EOF)
            fatal (_("unterminated string at end of file"));

-         putc (c, foutput);
+         obstack_1grow (oout, c);
+

          if (c == '\n')
            lineno++;
        }
 
          if (c == '\n')
            lineno++;
        }
 

-      c = getc(finput);
+      c = getc (fin);

     }
 
     }
 

-  putc(c, foutput);
+  obstack_1grow (oout, c);

 }
 
 
 }
 
 

-/* Dump the comment from IN to OUT1 and OUT2.  C is either `*' or `/',
-   depending upon the type of comments used.  OUT2 might be NULL.  */
+/*-----------------------------------------------------------------.
+| Dump the wannabee comment from IN to OUT1 and OUT2 (which can be |
+| NULL).  In fact we just saw a `/', which might or might not be a |
+| comment.  In any case, copy what we saw.                         |
+|                                                                  |
+| OUT2 might be NULL.                                              |
+`-----------------------------------------------------------------*/

 
 static inline void
 
 static inline void

-copy_comment2 (FILE *in, FILE *out1, FILE* out2, int c)
+copy_comment2 (FILE *fin, struct obstack *oout1, struct obstack *oout2)

 {
   int cplus_comment;
 {
   int cplus_comment;

-  register int ended;
+  int ended;
+  int c;
+
+  /* We read a `/', output it. */
+  obstack_1grow (oout1, '/');
+  if (oout2)
+    obstack_1grow (oout2, '/');
+
+  switch ((c = getc (fin)))
+    {
+    case '/':
+      cplus_comment = 1;
+      break;
+    case '*':
+      cplus_comment = 0;
+      break;
+    default:
+      ungetc (c, fin);
+      return;
+    }

 
 

-  cplus_comment = (c == '/');
-  putc (c, out1);
-  if (out2)
-    putc (c, out2);
-  c = getc (in);
+  obstack_1grow (oout1, c);
+  if (oout2)
+    obstack_1grow (oout2, c);
+  c = getc (fin);

 
   ended = 0;
   while (!ended)
 
   ended = 0;
   while (!ended)


@@ -227,247 +241,172 @@ copy_comment2 (FILE *in, FILE *out1, FILE* out2, int c)
        {
          while (c == '*')
            {
        {
          while (c == '*')
            {

-             putc (c, out1);
-             if (out2)
-               putc (c, out2);
-             c = getc (in);
+             obstack_1grow (oout1, c);
+             if (oout2)
+               obstack_1grow (oout2, c);
+             c = getc (fin);

            }
 
          if (c == '/')
            {
            }
 
          if (c == '/')
            {

-             putc(c, out1);
-             if (out2)
-               putc(c, out2);
+             obstack_1grow (oout1, c);
+             if (oout2)
+               obstack_1grow (oout2, c);

              ended = 1;
            }
        }
       else if (c == '\n')
        {
          lineno++;
              ended = 1;
            }
        }
       else if (c == '\n')
        {
          lineno++;

-         putc (c, out1);
-         if (out2)
-           putc (c, out2);
+         obstack_1grow (oout1, c);
+         if (oout2)
+           obstack_1grow (oout2, c);

          if (cplus_comment)
            ended = 1;
          else
          if (cplus_comment)
            ended = 1;
          else

-           c = getc (in);
+           c = getc (fin);

        }
       else if (c == EOF)
        fatal (_("unterminated comment"));
       else
        {
        }
       else if (c == EOF)
        fatal (_("unterminated comment"));
       else
        {

-         putc (c, out1);
-         if (out2)
-           putc (c, out2);
-         c = getc (in);
+         obstack_1grow (oout1, c);
+         if (oout2)
+           obstack_1grow (oout2, c);
+         c = getc (fin);

        }
     }
 }
 
 
        }
     }
 }
 
 

-/* Dump the comment from FINPUT to FOUTPUT.  C is either `*' or `/',
-   depending upon the type of comments used.  */
+/*-------------------------------------------------------------------.
+| Dump the comment (actually the current string starting with a `/') |
+| from FIN to OOUT.                                                  |
+`-------------------------------------------------------------------*/

 
 static inline void
 
 static inline void

-copy_comment (FILE *finput, FILE *foutput, int c)
+copy_comment (FILE *fin, struct obstack *oout)

 {
 {

-  copy_comment2 (finput, foutput, NULL, c);
+  copy_comment2 (fin, oout, NULL);

 }
 
 
 }
 
 

-void
-reader (void)
-{
-  start_flag = 0;
-  startval = NULL;  /* start symbol not specified yet. */
-
-#if 0
-  translations = 0;  /* initially assume token number translation not needed.  */
-#endif
-  /* Nowadays translations is always set to 1,
-     since we give `error' a user-token-number
-     to satisfy the Posix demand for YYERRCODE==256.  */
-  translations = 1;
-
-  nsyms = 1;
-  nvars = 0;
-  nrules = 0;
-  nitems = 0;
-  rline_allocated = 10;
-  rline = NEW2(rline_allocated, short);
-
-  typed = 0;
-  lastprec = 0;
-
-  gensym_count = 0;
+/*-----------------------------------------------------------------.
+| FIN is pointing to a location (i.e., a `@').  Output to OOUT a   |
+| reference to this location. STACK_OFFSET is the number of values |
+| in the current rule so far, which says where to find `$0' with   |
+| respect to the top of the stack.                                 |
+`-----------------------------------------------------------------*/

 
 

-  semantic_parser = 0;
-  pure_parser = 0;
-  yylsp_needed = 0;
+static inline void
+copy_at (FILE *fin, struct obstack *oout, int stack_offset)
+{
+  int c;

 
 

-  grammar = NULL;
+  c = getc (fin);
+  if (c == '$')
+    {
+      obstack_sgrow (oout, "yyloc");
+      locations_flag = 1;
+    }
+  else if (isdigit (c) || c == '-')
+    {
+      int n;
+      char buf[4096];

 
 

-  init_lex();
-  lineno = 1;
+      ungetc (c, fin);
+      n = read_signed_integer (fin);

 
 

-  /* initialize the symbol table.  */
-  tabinit();
-  /* construct the error token */
-  errtoken = getsym("error");
-  errtoken->class = STOKEN;
-  errtoken->user_token_number = 256; /* Value specified by posix.  */
-  /* construct a token that represents all undefined literal tokens. */
-  /* it is always token number 2.  */
-  undeftoken = getsym("$undefined.");
-  undeftoken->class = STOKEN;
-  undeftoken->user_token_number = 2;
-  /* Read the declaration section.  Copy %{ ... %} groups to ftable and fdefines file.
-     Also notice any %token, %left, etc. found there.  */
-  if (noparserflag)
-    fprintf(ftable, "\n/*  Bison-generated parse tables, made from %s\n",
-               infile);
+      obstack_fgrow1 (oout, "yylsp[%d]", n - stack_offset);
+      locations_flag = 1;
+    }

   else
   else

-    fprintf(ftable, "\n/*  A Bison parser, made from %s\n", infile);
-  fprintf(ftable, "    by %s  */\n\n", VERSION_STRING);
-  fprintf(ftable, "#define YYBISON 1  /* Identify Bison output.  */\n\n");
-  read_declarations();
-  /* start writing the guard and action files, if they are needed.  */
-  output_headers();
-  /* read in the grammar, build grammar in list form.  write out guards and actions.  */
-  readgram();
-  /* Now we know whether we need the line-number stack.
-     If we do, write its type into the .tab.h file.  */
-  if (fdefines)
-    reader_output_yylsp(fdefines);
-  /* write closing delimiters for actions and guards.  */
-  output_trailers();
-  if (yylsp_needed)
-    fprintf(ftable, "#define YYLSP_NEEDED\n\n");
-  /* assign the symbols their symbol numbers.
-     Write #defines for the token symbols into fdefines if requested.  */
-  packsymbols();
-  /* convert the grammar into the format described in gram.h.  */
-  packgram();
-  /* free the symbol table data structure
-     since symbols are now all referred to by symbol number.  */
-  free_symtab();
+    {
+      char buf[] = "@c";
+      buf[1] = c;
+      complain (_("%s is invalid"), quote (buf));
+    }

 }
 
 }
 

-void
-reader_output_yylsp (FILE *f)
-{
-  if (yylsp_needed)
-    fprintf(f, LTYPESTR);
-}

 
 

-/* Read from finput until `%%' is seen.  Discard the `%%'.  Handle any
-   `%' declarations, and copy the contents of any `%{ ... %}' groups
-   to fattrs.  */
+/*-------------------------------------------------------------------.
+| FIN is pointing to a wannabee semantic value (i.e., a `$').        |
+|                                                                    |
+| Possible inputs: $[<TYPENAME>]($|integer)                          |
+|                                                                    |
+| Output to OOUT a reference to this semantic value. STACK_OFFSET is |
+| the number of values in the current rule so far, which says where  |
+| to find `$0' with respect to the top of the stack.                 |
+`-------------------------------------------------------------------*/

 
 

-void
-read_declarations (void)
+static inline void
+copy_dollar (FILE *fin, struct obstack *oout,
+            symbol_list *rule, int stack_offset)

 {
 {

-  register int c;
-  register int tok;
+  int c = getc (fin);
+  char *type_name = NULL;

 
 

-  for (;;)
+  /* Get the type name if explicit. */
+  if (c == '<')

     {
     {

-      c = skip_white_space();
-
-      if (c == '%')
-       {
-         tok = parse_percent_token();
-
-         switch (tok)
-           {
-           case TWO_PERCENTS:
-             return;
-
-           case PERCENT_LEFT_CURLY:
-             copy_definition();
-             break;
-
-           case TOKEN:
-             parse_token_decl (STOKEN, SNTERM);
-             break;
-
-           case NTERM:
-             parse_token_decl (SNTERM, STOKEN);
-             break;
-
-           case TYPE:
-             parse_type_decl();
-             break;
-
-           case START:
-             parse_start_decl();
-             break;
-
-           case UNION:
-             parse_union_decl ();
-             break;
-
-           case EXPECT:
-             parse_expect_decl();
-             break;
-           case THONG:
-             parse_thong_decl();
-             break;
-           case LEFT:
-             parse_assoc_decl(LEFT_ASSOC);
-             break;
-
-           case RIGHT:
-             parse_assoc_decl(RIGHT_ASSOC);
-             break;
-
-           case NONASSOC:
-             parse_assoc_decl(NON_ASSOC);
-             break;
+      read_type_name (fin);
+      type_name = token_buffer;
+      value_components_used = 1;
+      c = getc (fin);
+    }

 
 

-           case SEMANTIC_PARSER:
-             if (semantic_parser == 0)
-               {
-                 semantic_parser = 1;
-                 open_extra_files();
-               }
-             break;
+  if (c == '$')
+    {
+      obstack_sgrow (oout, "yyval");
+
+      if (!type_name)
+       type_name = get_type_name (0, rule);
+      if (type_name)
+       obstack_fgrow1 (oout, ".%s", type_name);
+      if (!type_name && typed)
+       complain (_("$$ of `%s' has no declared type"),
+                 rule->sym->tag);
+    }
+  else if (isdigit (c) || c == '-')
+    {
+      int n;
+      ungetc (c, fin);
+      n = read_signed_integer (fin);

 
 

-           case PURE_PARSER:
-             pure_parser = 1;
-             break;
+      if (!type_name && n > 0)
+       type_name = get_type_name (n, rule);

 
 

-           case NOOP:
-             break;
+      obstack_fgrow1 (oout, "yyvsp[%d]", n - stack_offset);

 
 

-           default:
-             complain (_("unrecognized: %s"), token_buffer);
-             skip_to_char('%');
-         }
-       }
-      else if (c == EOF)
-        fatal (_("no input grammar"));
-      else
-       {
-         complain (_("unknown character: %s"), printable_version(c));
-         skip_to_char('%');
-       }
+      if (type_name)
+       obstack_fgrow1 (oout, ".%s", type_name);
+      if (!type_name && typed)
+       complain (_("$%d of `%s' has no declared type"),
+                 n, rule->sym->tag);
+    }
+  else
+    {
+      char buf[] = "$c";
+      buf[1] = c;
+      complain (_("%s is invalid"), quote (buf));

     }
 }
     }
 }

+\f
+/*-------------------------------------------------------------------.
+| Copy the contents of a `%{ ... %}' into the definitions file.  The |
+| `%{' has already been read.  Return after reading the `%}'.        |
+`-------------------------------------------------------------------*/

 
 

-
-/* Copy the contents of a `%{ ... %}' into the definitions file.  The
-   `%{' has already been read.  Return after reading the `%}'.  */
-
-void
+static void

 copy_definition (void)
 {
 copy_definition (void)
 {

-  register int c;
+  int c;

   /* -1 while reading a character if prev char was %. */
   /* -1 while reading a character if prev char was %. */

-  register int after_percent;
+  int after_percent;

 
 

-  if (!nolinesflag)
-    fprintf(fattrs, "#line %d \"%s\"\n", lineno, infile);
+  if (!no_lines_flag)
+    obstack_fgrow2 (&attrs_obstack, "#line %d %s\n",
+                   lineno, quotearg_style (c_quoting_style, infile));

 
   after_percent = 0;
 
 
   after_percent = 0;
 


@@ -478,102 +417,106 @@ copy_definition (void)
       switch (c)
        {
        case '\n':
       switch (c)
        {
        case '\n':

-         putc(c, fattrs);
+         obstack_1grow (&attrs_obstack, c);

          lineno++;
          break;
 
        case '%':
          lineno++;
          break;
 
        case '%':

-          after_percent = -1;
+         after_percent = -1;

          break;
 
        case '\'':
        case '"':
          break;
 
        case '\'':
        case '"':

-         copy_string (finput, fattrs, c);
+         copy_string (finput, &attrs_obstack, c);

          break;
 
        case '/':
          break;
 
        case '/':

-         putc (c, fattrs);
-         c = getc (finput);
-         if (c != '*' && c != '/')
-           continue;
-         copy_comment (finput, fattrs, c);
+         copy_comment (finput, &attrs_obstack);

          break;
 
        case EOF:
          break;
 
        case EOF:

-         fatal ("%s",
-                _("unterminated `%{' definition"));
+         fatal ("%s", _("unterminated `%{' definition"));

 
        default:
 
        default:

-         putc(c, fattrs);
+         obstack_1grow (&attrs_obstack, c);

        }
 
        }
 

-      c = getc(finput);
+      c = getc (finput);

 
       if (after_percent)
        {
          if (c == '}')
            return;
 
       if (after_percent)
        {
          if (c == '}')
            return;

-         putc('%', fattrs);
+         obstack_1grow (&attrs_obstack, '%');

        }
       after_percent = 0;
        }
       after_percent = 0;

-

     }
     }

-

 }
 
 
 }
 
 

+/*-------------------------------------------------------------------.
+| Parse what comes after %token or %nterm.  For %token, WHAT_IS is   |
+| token_sym and WHAT_IS_NOT is nterm_sym.  For %nterm, the arguments |
+| are reversed.                                                      |
+`-------------------------------------------------------------------*/

 
 

-/* parse what comes after %token or %nterm.
-For %token, what_is is STOKEN and what_is_not is SNTERM.
-For %nterm, the arguments are reversed.  */
-
-void
-parse_token_decl (int what_is, int what_is_not)
+static void
+parse_token_decl (symbol_class what_is, symbol_class what_is_not)

 {
 {

-  register int token = 0;
-  register char *typename = 0;
-  register struct bucket *symbol = NULL;  /* pts to symbol being defined */
-  int k;
+  token_t token = 0;
+  char *typename = 0;
+
+  /* The symbol being defined.  */
+  struct bucket *symbol = NULL;

 
 

+  /* After `%token' and `%nterm', any number of symbols maybe be
+     defined.  */

   for (;;)
     {
       int tmp_char = ungetc (skip_white_space (), finput);
 
   for (;;)
     {
       int tmp_char = ungetc (skip_white_space (), finput);
 

+      /* `%' (for instance from `%token', or from `%%' etc.) is the
+        only valid means to end this declaration.  */

       if (tmp_char == '%')
        return;
       if (tmp_char == EOF)
        fatal (_("Premature EOF after %s"), token_buffer);
 
       if (tmp_char == '%')
        return;
       if (tmp_char == EOF)
        fatal (_("Premature EOF after %s"), token_buffer);
 

-      token = lex();
-      if (token == COMMA)
+      token = lex ();
+      if (token == tok_comma)

        {
          symbol = NULL;
          continue;
        }
        {
          symbol = NULL;
          continue;
        }

-      if (token == TYPENAME)
+      if (token == tok_typename)

        {
        {

-         k = strlen(token_buffer);
-         typename = NEW2(k + 1, char);
-         strcpy(typename, token_buffer);
+         typename = xstrdup (token_buffer);

          value_components_used = 1;
          symbol = NULL;
        }
          value_components_used = 1;
          symbol = NULL;
        }

-      else if (token == IDENTIFIER && *symval->tag == '\"'
-               && symbol)
+      else if (token == tok_identifier && *symval->tag == '\"' && symbol)

        {
        {

+         if (symval->alias)
+           warn (_("symbol `%s' used more than once as a literal string"),
+                 symval->tag);
+         else if (symbol->alias)
+           warn (_("symbol `%s' given more than one literal string"),
+                 symbol->tag);
+         else
+           {
+             symval->class = token_sym;
+             symval->type_name = typename;
+             symval->user_token_number = symbol->user_token_number;
+             symbol->user_token_number = SALIAS;
+             symval->alias = symbol;
+             symbol->alias = symval;
+             /* symbol and symval combined are only one symbol */
+             nsyms--;
+           }

          translations = 1;
          translations = 1;

-         symval->class = STOKEN;
-         symval->type_name = typename;
-         symval->user_token_number = symbol->user_token_number;
-         symbol->user_token_number = SALIAS;
-
-         symval->alias = symbol;
-         symbol->alias = symval;
-         symbol = NULL;
-
-         nsyms--;   /* symbol and symval combined are only one symbol */
+         symbol = NULL;

        }
        }

-      else if (token == IDENTIFIER)
+      else if (token == tok_identifier)

        {
          int oldclass = symval->class;
          symbol = symval;
        {
          int oldclass = symval->class;
          symbol = symval;


@@ -581,118 +524,43 @@ parse_token_decl (int what_is, int what_is_not)
          if (symbol->class == what_is_not)
            complain (_("symbol %s redefined"), symbol->tag);
          symbol->class = what_is;
          if (symbol->class == what_is_not)
            complain (_("symbol %s redefined"), symbol->tag);
          symbol->class = what_is;

-         if (what_is == SNTERM && oldclass != SNTERM)
+         if (what_is == nterm_sym && oldclass != nterm_sym)

            symbol->value = nvars++;
 
          if (typename)
            {
              if (symbol->type_name == NULL)
                symbol->type_name = typename;
            symbol->value = nvars++;
 
          if (typename)
            {
              if (symbol->type_name == NULL)
                symbol->type_name = typename;

-             else if (strcmp(typename, symbol->type_name) != 0)
+             else if (strcmp (typename, symbol->type_name) != 0)

                complain (_("type redeclaration for %s"), symbol->tag);
            }
        }
                complain (_("type redeclaration for %s"), symbol->tag);
            }
        }

-      else if (symbol && token == NUMBER)
-        {
+      else if (symbol && token == tok_number)
+       {

          symbol->user_token_number = numval;
          translations = 1;
          symbol->user_token_number = numval;
          translations = 1;

-        }
+       }

       else
        {
          complain (_("`%s' is invalid in %s"),
       else
        {
          complain (_("`%s' is invalid in %s"),

-                   token_buffer,
-               (what_is == STOKEN) ? "%token" : "%nterm");
-         skip_to_char('%');
+                   token_buffer, (what_is == token_sym) ? "%token" : "%nterm");
+         skip_to_char ('%');

        }
     }
 
 }
 
        }
     }
 
 }
 

-/* parse what comes after %thong
-       the full syntax is
-               %thong <type> token number literal
- the <type> or number may be omitted.  The number specifies the
- user_token_number.
-
- Two symbols are entered in the table, one for the token symbol and
- one for the literal.  Both are given the <type>, if any, from the declaration.
- The ->user_token_number of the first is SALIAS and the ->user_token_number
- of the second is set to the number, if any, from the declaration.
- The two symbols are linked via pointers in their ->alias fields.
-
- during output_defines_table, the symbol is reported
- thereafter, only the literal string is retained
- it is the literal string that is output to yytname
-*/

 
 

-void
-parse_thong_decl (void)
-{
-  register int token;
-  register struct bucket *symbol;
-  register char *typename = 0;
-  int k, usrtoknum;
+/*------------------------------.
+| Parse what comes after %start |
+`------------------------------*/

 
 

-  translations = 1;
-  token = lex();               /* fetch typename or first token */
-  if (token == TYPENAME) {
-    k = strlen(token_buffer);
-    typename = NEW2(k + 1, char);
-    strcpy(typename, token_buffer);
-    value_components_used = 1;
-    token = lex();             /* fetch first token */
-  }
-
-  /* process first token */
-
-  if (token != IDENTIFIER)
-    {
-      complain (_("unrecognized item %s, expected an identifier"),
-               token_buffer);
-      skip_to_char('%');
-      return;
-    }
-  symval->class = STOKEN;
-  symval->type_name = typename;
-  symval->user_token_number = SALIAS;
-  symbol = symval;
-
-  token = lex();               /* get number or literal string */
-
-  if (token == NUMBER) {
-    usrtoknum = numval;
-    token = lex();             /* okay, did number, now get literal */
-  }
-  else usrtoknum = 0;
-
-  /* process literal string token */
-
-  if (token != IDENTIFIER || *symval->tag != '\"')
-    {
-      complain (_("expected string constant instead of %s"),
-               token_buffer);
-      skip_to_char('%');
-      return;
-    }
-  symval->class = STOKEN;
-  symval->type_name = typename;
-  symval->user_token_number = usrtoknum;
-
-  symval->alias = symbol;
-  symbol->alias = symval;
-
-  nsyms--;                     /* symbol and symval combined are only one symbol */
-}
-
-
-/* Parse what comes after %start */
-
-void
+static void

 parse_start_decl (void)
 {
   if (start_flag)
     complain (_("multiple %s declarations"), "%start");
 parse_start_decl (void)
 {
   if (start_flag)
     complain (_("multiple %s declarations"), "%start");

-  if (lex () != IDENTIFIER)
+  if (lex () != tok_identifier)

     complain (_("invalid %s declaration"), "%start");
   else
     {
     complain (_("invalid %s declaration"), "%start");
   else
     {


@@ -701,30 +569,28 @@ parse_start_decl (void)
     }
 }
 
     }
 }
 

+/*-----------------------------------------------------------.
+| read in a %type declaration and record its information for |
+| get_type_name to access                                    |
+`-----------------------------------------------------------*/

 
 

-
-/* read in a %type declaration and record its information for get_type_name to access */
-
-void
+static void

 parse_type_decl (void)
 {
 parse_type_decl (void)
 {

-  register int k;
-  register char *name;
+  char *name;

 
 

-  if (lex() != TYPENAME)
+  if (lex () != tok_typename)

     {
       complain ("%s", _("%type declaration has no <typename>"));
     {
       complain ("%s", _("%type declaration has no <typename>"));

-      skip_to_char('%');
+      skip_to_char ('%');

       return;
     }
 
       return;
     }
 

-  k = strlen(token_buffer);
-  name = NEW2(k + 1, char);
-  strcpy(name, token_buffer);
+  name = xstrdup (token_buffer);

 
   for (;;)
     {
 
   for (;;)
     {

-      register int t;
+      token_t t;

       int tmp_char = ungetc (skip_white_space (), finput);
 
       if (tmp_char == '%')
       int tmp_char = ungetc (skip_white_space (), finput);
 
       if (tmp_char == '%')


@@ -732,19 +598,19 @@ parse_type_decl (void)
       if (tmp_char == EOF)
        fatal (_("Premature EOF after %s"), token_buffer);
 
       if (tmp_char == EOF)
        fatal (_("Premature EOF after %s"), token_buffer);
 

-      t = lex();
+      t = lex ();

 
       switch (t)
        {
 
 
       switch (t)
        {
 

-       case COMMA:
-       case SEMICOLON:
+       case tok_comma:
+       case tok_semicolon:

          break;
 
          break;
 

-       case IDENTIFIER:
+       case tok_identifier:

          if (symval->type_name == NULL)
            symval->type_name = name;
          if (symval->type_name == NULL)
            symval->type_name = name;

-         else if (strcmp(name, symval->type_name) != 0)
+         else if (strcmp (name, symval->type_name) != 0)

            complain (_("type redeclaration for %s"), symval->tag);
 
          break;
            complain (_("type redeclaration for %s"), symval->tag);
 
          break;


@@ -752,28 +618,29 @@ parse_type_decl (void)
        default:
          complain (_("invalid %%type declaration due to item: %s"),
                    token_buffer);
        default:
          complain (_("invalid %%type declaration due to item: %s"),
                    token_buffer);

-         skip_to_char('%');
+         skip_to_char ('%');

        }
     }
 }
 
 
 
        }
     }
 }
 
 
 

-/* read in a %left, %right or %nonassoc declaration and record its information.  */
-/* assoc is either LEFT_ASSOC, RIGHT_ASSOC or NON_ASSOC.  */
+/*----------------------------------------------------------------.
+| Read in a %left, %right or %nonassoc declaration and record its |
+| information.                                                    |
+`----------------------------------------------------------------*/

 
 

-void
-parse_assoc_decl (int assoc)
+static void
+parse_assoc_decl (associativity assoc)

 {
 {

-  register int k;
-  register char *name = NULL;
-  register int prev = 0;
+  char *name = NULL;
+  int prev = 0;

 
 

-  lastprec++;  /* Assign a new precedence level, never 0.  */
+  lastprec++;                  /* Assign a new precedence level, never 0.  */

 
   for (;;)
     {
 
   for (;;)
     {

-      register int t;
+      token_t t;

       int tmp_char = ungetc (skip_white_space (), finput);
 
       if (tmp_char == '%')
       int tmp_char = ungetc (skip_white_space (), finput);
 
       if (tmp_char == '%')


@@ -781,57 +648,55 @@ parse_assoc_decl (int assoc)
       if (tmp_char == EOF)
        fatal (_("Premature EOF after %s"), token_buffer);
 
       if (tmp_char == EOF)
        fatal (_("Premature EOF after %s"), token_buffer);
 

-      t = lex();
+      t = lex ();

 
       switch (t)
        {
 
       switch (t)
        {

-
-       case TYPENAME:
-         k = strlen(token_buffer);
-         name = NEW2(k + 1, char);
-         strcpy(name, token_buffer);
+       case tok_typename:
+         name = xstrdup (token_buffer);

          break;
 
          break;
 

-       case COMMA:
+       case tok_comma:

          break;
 
          break;
 

-       case IDENTIFIER:
+       case tok_identifier:

          if (symval->prec != 0)
            complain (_("redefining precedence of %s"), symval->tag);
          symval->prec = lastprec;
          symval->assoc = assoc;
          if (symval->prec != 0)
            complain (_("redefining precedence of %s"), symval->tag);
          symval->prec = lastprec;
          symval->assoc = assoc;

-         if (symval->class == SNTERM)
+         if (symval->class == nterm_sym)

            complain (_("symbol %s redefined"), symval->tag);
            complain (_("symbol %s redefined"), symval->tag);

-         symval->class = STOKEN;
+         symval->class = token_sym;

          if (name)
          if (name)

-           { /* record the type, if one is specified */
+           {                   /* record the type, if one is specified */

              if (symval->type_name == NULL)
                symval->type_name = name;
              if (symval->type_name == NULL)
                symval->type_name = name;

-             else if (strcmp(name, symval->type_name) != 0)
+             else if (strcmp (name, symval->type_name) != 0)

                complain (_("type redeclaration for %s"), symval->tag);
            }
          break;
 
                complain (_("type redeclaration for %s"), symval->tag);
            }
          break;
 

-       case NUMBER:
-         if (prev == IDENTIFIER)
-            {
+       case tok_number:
+         if (prev == tok_identifier)
+           {

              symval->user_token_number = numval;
              translations = 1;
              symval->user_token_number = numval;
              translations = 1;

-            }
-          else
-            {
-             complain (_("invalid text (%s) - number should be after identifier"),
-                       token_buffer);
-             skip_to_char('%');
-            }
+           }
+         else
+           {
+             complain (_
+                       ("invalid text (%s) - number should be after identifier"),
+token_buffer);
+             skip_to_char ('%');
+           }

          break;
 
          break;
 

-       case SEMICOLON:
+       case tok_semicolon:

          return;
 
        default:
          complain (_("unexpected item: %s"), token_buffer);
          return;
 
        default:
          complain (_("unexpected item: %s"), token_buffer);

-         skip_to_char('%');
+         skip_to_char ('%');

        }
 
       prev = t;
        }
 
       prev = t;


@@ -841,37 +706,40 @@ parse_assoc_decl (int assoc)
 
 
 
 
 
 

-/* copy the union declaration into fattrs (and fdefines),
-   where it is made into the
-   definition of YYSTYPE, the type of elements of the parser value stack.  */
+/*--------------------------------------------------------------.
+| Copy the union declaration into ATTRS_OBSTACK (and fdefines), |
+| where it is made into the definition of YYSTYPE, the type of  |
+| elements of the parser value stack.                           |
+`--------------------------------------------------------------*/

 
 

-void
+static void

 parse_union_decl (void)
 {
 parse_union_decl (void)
 {

-  register int c;
-  register int count = 0;
+  int c;
+  int count = 0;

 
   if (typed)
     complain (_("multiple %s declarations"), "%union");
 
   typed = 1;
 
 
   if (typed)
     complain (_("multiple %s declarations"), "%union");
 
   typed = 1;
 

-  if (!nolinesflag)
-    fprintf (fattrs, "\n#line %d \"%s\"\n", lineno, infile);
+  if (!no_lines_flag)
+    obstack_fgrow2 (&attrs_obstack, "\n#line %d %s\n",
+                   lineno, quotearg_style (c_quoting_style, infile));

   else
   else

-    fprintf (fattrs, "\n");
+    obstack_1grow (&attrs_obstack, '\n');

 
 

-  fprintf (fattrs, "typedef union");
-  if (fdefines)
-    fprintf (fdefines, "typedef union");
+  obstack_sgrow (&attrs_obstack, "typedef union");
+  if (defines_flag)
+    obstack_sgrow (&defines_obstack, "typedef union");

 
   c = getc (finput);
 
   while (c != EOF)
     {
 
   c = getc (finput);
 
   while (c != EOF)
     {

-      putc (c, fattrs);
-      if (fdefines)
-       putc (c, fdefines);
+      obstack_1grow (&attrs_obstack, c);
+      if (defines_flag)
+       obstack_1grow (&defines_obstack, c);

 
       switch (c)
        {
 
       switch (c)
        {


@@ -880,13 +748,9 @@ parse_union_decl (void)
          break;
 
        case '/':
          break;
 
        case '/':

-         c = getc (finput);
-         if (c != '*' && c != '/')
-           continue;
-         copy_comment2 (finput, fattrs, fdefines, c);
+         copy_comment2 (finput, &defines_obstack, &attrs_obstack);

          break;
 
          break;
 

-

        case '{':
          count++;
          break;
        case '{':
          count++;
          break;


@@ -897,13 +761,13 @@ parse_union_decl (void)
          count--;
          if (count <= 0)
            {
          count--;
          if (count <= 0)
            {

-             fprintf (fattrs, " YYSTYPE;\n");
-             if (fdefines)
-               fprintf (fdefines, " YYSTYPE;\n");
+             obstack_sgrow (&attrs_obstack, " YYSTYPE;\n");
+             if (defines_flag)
+               obstack_sgrow (&defines_obstack, " YYSTYPE;\n");

              /* JF don't choke on trailing semi */
              c = skip_white_space ();
              if (c != ';')
              /* JF don't choke on trailing semi */
              c = skip_white_space ();
              if (c != ';')

-               ungetc (c,finput);
+               ungetc (c, finput);

              return;
            }
        }
              return;
            }
        }


@@ -912,441 +776,512 @@ parse_union_decl (void)
     }
 }
 
     }
 }
 

-/* parse the declaration %expect N which says to expect N
-   shift-reduce conflicts.  */

 
 

-void
+/*-------------------------------------------------------.
+| Parse the declaration %expect N which says to expect N |
+| shift-reduce conflicts.                                |
+`-------------------------------------------------------*/
+
+static void

 parse_expect_decl (void)
 {
 parse_expect_decl (void)
 {

-  register int c;
-  register int count;
-  char buffer[20];
+  int c = skip_white_space ();
+  ungetc (c, finput);
+
+  if (!isdigit (c))
+    complain (_("argument of %%expect is not an integer"));
+  else
+    expected_conflicts = read_signed_integer (finput);
+}

 
 

-  c = getc(finput);
-  while (c == ' ' || c == '\t')
-    c = getc(finput);

 
 

-  count = 0;
-  while (c >= '0' && c <= '9')
+/*-------------------------------------------------------------------.
+| Parse what comes after %thong.  the full syntax is                 |
+|                                                                    |
+|                %thong <type> token number literal                  |
+|                                                                    |
+| the <type> or number may be omitted.  The number specifies the     |
+| user_token_number.                                                 |
+|                                                                    |
+| Two symbols are entered in the table, one for the token symbol and |
+| one for the literal.  Both are given the <type>, if any, from the  |
+| declaration.  The ->user_token_number of the first is SALIAS and   |
+| the ->user_token_number of the second is set to the number, if     |
+| any, from the declaration.  The two symbols are linked via         |
+| pointers in their ->alias fields.                                  |
+|                                                                    |
+| During OUTPUT_DEFINES_TABLE, the symbol is reported thereafter,    |
+| only the literal string is retained it is the literal string that  |
+| is output to yytname                                               |
+`-------------------------------------------------------------------*/
+
+static void
+parse_thong_decl (void)
+{
+  token_t token;
+  struct bucket *symbol;
+  char *typename = 0;
+  int usrtoknum;
+
+  translations = 1;
+  token = lex ();              /* fetch typename or first token */
+  if (token == tok_typename)

     {
     {

-      if (count < 20)
-       buffer[count++] = c;
-      c = getc(finput);
+      typename = xstrdup (token_buffer);
+      value_components_used = 1;
+      token = lex ();          /* fetch first token */

     }
     }

-  buffer[count] = 0;

 
 

-  ungetc (c, finput);
+  /* process first token */

 
 

-  if (count <= 0 || count > 10)
-    complain ("%s", _("argument of %expect is not an integer"));
-  expected_conflicts = atoi (buffer);
+  if (token != tok_identifier)
+    {
+      complain (_("unrecognized item %s, expected an identifier"),
+               token_buffer);
+      skip_to_char ('%');
+      return;
+    }
+  symval->class = token_sym;
+  symval->type_name = typename;
+  symval->user_token_number = SALIAS;
+  symbol = symval;
+
+  token = lex ();              /* get number or literal string */
+
+  if (token == tok_number)
+    {
+      usrtoknum = numval;
+      token = lex ();          /* okay, did number, now get literal */
+    }
+  else
+    usrtoknum = 0;
+
+  /* process literal string token */
+
+  if (token != tok_identifier || *symval->tag != '\"')
+    {
+      complain (_("expected string constant instead of %s"), token_buffer);
+      skip_to_char ('%');
+      return;
+    }
+  symval->class = token_sym;
+  symval->type_name = typename;
+  symval->user_token_number = usrtoknum;
+
+  symval->alias = symbol;
+  symbol->alias = symval;
+
+  /* symbol and symval combined are only one symbol.  */
+  nsyms--;

 }
 
 }
 

-/* that's all of parsing the declaration section */
-\f
-/* FINPUT is pointing to a location (i.e., a `@').  Output to FOUTPUT
-   a reference to this location. STACK_OFFSET is the number of values
-   in the current rule so far, which says where to find `$0' with
-   respect to the top of the stack.  */
-static inline void
-copy_at (FILE *finput, FILE *foutput, int stack_offset)
+
+/*----------------------------------------------------------------.
+| Read from finput until `%%' is seen.  Discard the `%%'.  Handle |
+| any `%' declarations, and copy the contents of any `%{ ... %}'  |
+| groups to ATTRS_OBSTACK.                                        |
+`----------------------------------------------------------------*/
+
+static void
+read_declarations (void)

 {
   int c;
 {
   int c;

+  int tok;

 
 

-  c = getc (finput);
-  if (c == '$')
-    {
-      fprintf (foutput, "yyloc");
-      yylsp_needed = 1;
-    }
-  else if (isdigit(c) || c == '-')
+  for (;;)

     {
     {

-      int n;
+      c = skip_white_space ();
+
+      if (c == '%')
+       {
+         tok = parse_percent_token ();
+
+         switch (tok)
+           {
+           case tok_two_percents:
+             return;
+
+           case tok_percent_left_curly:
+             copy_definition ();
+             break;
+
+           case tok_token:
+             parse_token_decl (token_sym, nterm_sym);
+             break;
+
+           case tok_nterm:
+             parse_token_decl (nterm_sym, token_sym);
+             break;
+
+           case tok_type:
+             parse_type_decl ();
+             break;
+
+           case tok_start:
+             parse_start_decl ();
+             break;
+
+           case tok_union:
+             parse_union_decl ();
+             break;
+
+           case tok_expect:
+             parse_expect_decl ();
+             break;
+
+           case tok_thong:
+             parse_thong_decl ();
+             break;
+
+           case tok_left:
+             parse_assoc_decl (left_assoc);
+             break;
+
+           case tok_right:
+             parse_assoc_decl (right_assoc);
+             break;
+
+           case tok_nonassoc:
+             parse_assoc_decl (non_assoc);
+             break;

 
 

-      ungetc (c, finput);
-      n = read_signed_integer (finput);
+           case tok_noop:
+             break;

 
 

-      fprintf (foutput, "yylsp[%d]", n - stack_offset);
-      yylsp_needed = 1;
+           default:
+             complain (_("unrecognized: %s"), token_buffer);
+             skip_to_char ('%');
+           }
+       }
+      else if (c == EOF)
+       fatal (_("no input grammar"));
+      else
+       {
+         char buf[] = "c";
+         buf[0] = c;
+         complain (_("unknown character: %s"), quote (buf));
+         skip_to_char ('%');
+       }

     }
     }

-  else
-    complain (_("@%s is invalid"), printable_version (c));

 }
 }

+\f
+/*-------------------------------------------------------------------.
+| Assuming that a `{' has just been seen, copy everything up to the  |
+| matching `}' into the actions file.  STACK_OFFSET is the number of |
+| values in the current rule so far, which says where to find `$0'   |
+| with respect to the top of the stack.                              |
+`-------------------------------------------------------------------*/

 
 

+static void
+copy_action (symbol_list *rule, int stack_offset)
+{
+  int c;
+  int count;
+  char buf[4096];

 
 

-/* Get the data type (alternative in the union) of the value for
-   symbol n in rule rule.  */
+  /* offset is always 0 if parser has already popped the stack pointer */
+  if (semantic_parser)
+    stack_offset = 0;

 
 

-char *
-get_type_name (int n, symbol_list *rule)
-{
-  register int i;
-  register symbol_list *rp;
+  sprintf (buf, "\ncase %d:\n", nrules);
+  obstack_grow (&action_obstack, buf, strlen (buf));

 
 

-  if (n < 0)
+  if (!no_lines_flag)

     {
     {

-      complain (_("invalid $ value"));
-      return NULL;
+      sprintf (buf, "#line %d %s\n",
+              lineno, quotearg_style (c_quoting_style, infile));
+      obstack_grow (&action_obstack, buf, strlen (buf));

     }
     }

+  obstack_1grow (&action_obstack, '{');
+
+  count = 1;
+  c = getc (finput);
+
+  while (count > 0)
+    {
+      while (c != '}')
+       {
+         switch (c)
+           {
+           case '\n':
+             obstack_1grow (&action_obstack, c);
+             lineno++;
+             break;
+
+           case '{':
+             obstack_1grow (&action_obstack, c);
+             count++;
+             break;
+
+           case '\'':
+           case '"':
+             copy_string (finput, &action_obstack, c);
+             break;
+
+           case '/':
+             copy_comment (finput, &action_obstack);
+             break;
+
+           case '$':
+             copy_dollar (finput, &action_obstack,
+                          rule, stack_offset);
+             break;
+
+           case '@':
+             copy_at (finput, &action_obstack,
+                      stack_offset);
+             break;
+
+           case EOF:
+             fatal (_("unmatched %s"), "`{'");
+
+           default:
+             obstack_1grow (&action_obstack, c);
+           }
+
+         c = getc (finput);
+       }

 
 

-  rp = rule;
-  i = 0;
+      /* above loop exits when c is '}' */

 
 

-  while (i < n)
-    {
-      rp = rp->next;
-      if (rp == NULL || rp->sym == NULL)
+      if (--count)

        {
        {

-         complain (_("invalid $ value"));
-         return NULL;
+         obstack_1grow (&action_obstack, c);
+         c = getc (finput);

        }
        }

-      i++;

     }
 
     }
 

-  return rp->sym->type_name;
+  obstack_sgrow (&action_obstack, ";\n    break;}");

 }
 }

+\f
+/*-------------------------------------------------------------------.
+| After `%guard' is seen in the input file, copy the actual guard    |
+| into the guards file.  If the guard is followed by an action, copy |
+| that into the actions file.  STACK_OFFSET is the number of values  |
+| in the current rule so far, which says where to find `$0' with     |
+| respect to the top of the stack, for the simple parser in which    |
+| the stack is not popped until after the guard is run.              |
+`-------------------------------------------------------------------*/

 
 

-
-
-/* After `%guard' is seen in the input file, copy the actual guard
-   into the guards file.  If the guard is followed by an action, copy
-   that into the actions file.  STACK_OFFSET is the number of values
-   in the current rule so far, which says where to find `$0' with
-   respect to the top of the stack, for the simple parser in which the
-   stack is not popped until after the guard is run.  */
-
-void
+static void

 copy_guard (symbol_list *rule, int stack_offset)
 {
 copy_guard (symbol_list *rule, int stack_offset)
 {

-  register int c;
-  register int n;
-  register int count;
-  register char *type_name;
+  int c;
+  int count;

   int brace_flag = 0;
 
   /* offset is always 0 if parser has already popped the stack pointer */
   int brace_flag = 0;
 
   /* offset is always 0 if parser has already popped the stack pointer */

-  if (semantic_parser) stack_offset = 0;
+  if (semantic_parser)
+    stack_offset = 0;

 
 

-  fprintf(fguard, "\ncase %d:\n", nrules);
-  if (!nolinesflag)
-    fprintf (fguard, "#line %d \"%s\"\n", lineno, infile);
-  putc('{', fguard);
+  obstack_fgrow1 (&guard_obstack, "\ncase %d:\n", nrules);
+  if (!no_lines_flag)
+    obstack_fgrow2 (&guard_obstack, "#line %d %s\n",
+                   lineno, quotearg_style (c_quoting_style, infile));
+  obstack_1grow (&guard_obstack, '{');

 
   count = 0;
 
   count = 0;

-  c = getc(finput);
+  c = getc (finput);

 
   while (brace_flag ? (count > 0) : (c != ';'))
     {
       switch (c)
        {
        case '\n':
 
   while (brace_flag ? (count > 0) : (c != ';'))
     {
       switch (c)
        {
        case '\n':

-         putc(c, fguard);
+         obstack_1grow (&guard_obstack, c);

          lineno++;
          break;
 
        case '{':
          lineno++;
          break;
 
        case '{':

-         putc(c, fguard);
+         obstack_1grow (&guard_obstack, c);

          brace_flag = 1;
          count++;
          break;
 
        case '}':
          brace_flag = 1;
          count++;
          break;
 
        case '}':

-         putc(c, fguard);
+         obstack_1grow (&guard_obstack, c);

          if (count > 0)
            count--;
          else
            {
              complain (_("unmatched %s"), "`}'");
          if (count > 0)
            count--;
          else
            {
              complain (_("unmatched %s"), "`}'");

-             c = getc(finput); /* skip it */
+             c = getc (finput);        /* skip it */

            }
            }

-          break;
+         break;

 
        case '\'':
        case '"':
 
        case '\'':
        case '"':

-         copy_string (finput, fguard, c);
+         copy_string (finput, &guard_obstack, c);

          break;
 
        case '/':
          break;
 
        case '/':

-         putc (c, fguard);
-         c = getc (finput);
-         if (c != '*' && c != '/')
-           continue;
-         copy_comment (finput, fguard, c);
+         copy_comment (finput, &guard_obstack);

          break;
 
        case '$':
          break;
 
        case '$':

-         c = getc(finput);
-         type_name = NULL;
-
-         if (c == '<')
-           {
-             register char *cp = token_buffer;
-
-             while ((c = getc(finput)) != '>' && c > 0)
-               {
-                 if (cp == token_buffer + maxtoken)
-                   cp = grow_token_buffer(cp);
-
-                 *cp++ = c;
-               }
-             *cp = 0;
-             type_name = token_buffer;
-
-             c = getc(finput);
-           }
-
-         if (c == '$')
-           {
-             fprintf(fguard, "yyval");
-             if (!type_name)
-               type_name = rule->sym->type_name;
-             if (type_name)
-               fprintf(fguard, ".%s", type_name);
-             if(!type_name && typed)
-               complain (_("$$ of `%s' has no declared type"),
-                         rule->sym->tag);
-           }
-         else if (isdigit(c) || c == '-')
-           {
-             ungetc (c, finput);
-             n = read_signed_integer (finput);
-             c = getc (finput);
-
-             if (!type_name && n > 0)
-               type_name = get_type_name(n, rule);
-
-             fprintf(fguard, "yyvsp[%d]", n - stack_offset);
-             if (type_name)
-               fprintf(fguard, ".%s", type_name);
-             if (!type_name && typed)
-               complain (_("$%d of `%s' has no declared type"),
-                         n, rule->sym->tag);
-             continue;
-           }
-         else
-           complain (_("$%s is invalid"), printable_version (c));
+         copy_dollar (finput, &guard_obstack, rule, stack_offset);

          break;
 
        case '@':
          break;
 
        case '@':

-         copy_at (finput, fguard, stack_offset);
+         copy_at (finput, &guard_obstack, stack_offset);

          break;
 
        case EOF:
          break;
 
        case EOF:

-         fatal ("%s",
-                _("unterminated %guard clause"));
+         fatal ("%s", _("unterminated %guard clause"));

 
        default:
 
        default:

-         putc (c, fguard);
+         obstack_1grow (&guard_obstack, c);

        }
 
       if (c != '}' || count != 0)
        }
 
       if (c != '}' || count != 0)

-       c = getc(finput);
+       c = getc (finput);

     }
 
     }
 

-  c = skip_white_space();
+  c = skip_white_space ();

 
 

-  fprintf(fguard, ";\n    break;}");
+  obstack_sgrow (&guard_obstack, ";\n    break;}");

   if (c == '{')
     copy_action (rule, stack_offset);
   else if (c == '=')
     {
   if (c == '{')
     copy_action (rule, stack_offset);
   else if (c == '=')
     {

-      c = getc(finput);        /* why not skip_white_space -wjh */
+      c = getc (finput);       /* why not skip_white_space -wjh */

       if (c == '{')
        copy_action (rule, stack_offset);
     }
   else
       if (c == '{')
        copy_action (rule, stack_offset);
     }
   else

-    ungetc(c, finput);
+    ungetc (c, finput);

 }
 }

+\f

 
 

-
-
-/* Assuming that a `{' has just been seen, copy everything up to the
-   matching `}' into the actions file.  STACK_OFFSET is the number of
-   values in the current rule so far, which says where to find `$0'
-   with respect to the top of the stack.  */
-
-void
-copy_action (symbol_list *rule, int stack_offset)
+static void
+record_rule_line (void)

 {
 {

-  register int c;
-  register int n;
-  register int count;
-  register char *type_name;
-
-  /* offset is always 0 if parser has already popped the stack pointer */
-  if (semantic_parser)
-    stack_offset = 0;
-
-  fprintf (faction, "\ncase %d:\n", nrules);
-  if (!nolinesflag)
-    fprintf (faction, "#line %d \"%s\"\n", lineno, infile);
-  putc ('{', faction);
-
-  count = 1;
-  c = getc(finput);
+  /* Record each rule's source line number in rline table.  */

 
 

-  while (count > 0)
+  if (nrules >= rline_allocated)

     {
     {

-      while (c != '}')
-        {
-          switch (c)
-           {
-           case '\n':
-             putc(c, faction);
-             lineno++;
-             break;
+      rline_allocated = nrules * 2;
+      rline = XREALLOC (rline, short, rline_allocated);
+    }
+  rline[nrules] = lineno;
+}

 
 

-           case '{':
-             putc(c, faction);
-             count++;
-             break;

 
 

-           case '\'':
-           case '"':
-             copy_string (finput, faction, c);
-             break;
+/*-------------------------------------------------------------------.
+| Generate a dummy symbol, a nonterminal, whose name cannot conflict |
+| with the user's names.                                             |
+`-------------------------------------------------------------------*/

 
 

-           case '/':
-             putc (c, faction);
-             c = getc (finput);
-             if (c != '*' && c != '/')
-               continue;
-             copy_comment (finput, faction, c);
-             break;
+static bucket *
+gensym (void)
+{
+  /* Incremented for each generated symbol */
+  static int gensym_count = 0;
+  static char buf[256];

 
 

-           case '$':
-             c = getc(finput);
-             type_name = NULL;
+  bucket *sym;

 
 

-             if (c == '<')
-               {
-                 register char *cp = token_buffer;
+  sprintf (buf, "@%d", ++gensym_count);
+  token_buffer = buf;
+  sym = getsym (token_buffer);
+  sym->class = nterm_sym;
+  sym->value = nvars++;
+  return sym;
+}

 
 

-                 while ((c = getc(finput)) != '>' && c > 0)
-                   {
-                     if (cp == token_buffer + maxtoken)
-                       cp = grow_token_buffer(cp);
+#if 0
+/*------------------------------------------------------------------.
+| read in a %type declaration and record its information for        |
+| get_type_name to access.  This is unused.  It is only called from |
+| the #if 0 part of readgram                                        |
+`------------------------------------------------------------------*/

 
 

-                     *cp++ = c;
-                   }
-                 *cp = 0;
-                 type_name = token_buffer;
-                 value_components_used = 1;
+static int
+get_type (void)
+{
+  int k;
+  token_t token;
+  char *name;

 
 

-                 c = getc(finput);
-               }
-             if (c == '$')
-               {
-                 fprintf(faction, "yyval");
-                 if (!type_name)
-                   type_name = get_type_name(0, rule);
-                 if (type_name)
-                   fprintf(faction, ".%s", type_name);
-                 if(!type_name && typed)
-                   complain (_("$$ of `%s' has no declared type"),
-                             rule->sym->tag);
-               }
-             else if (isdigit(c) || c == '-')
-               {
-                 ungetc (c, finput);
-                 n = read_signed_integer(finput);
-                 c = getc(finput);
-
-                 if (!type_name && n > 0)
-                   type_name = get_type_name(n, rule);
-
-                 fprintf(faction, "yyvsp[%d]", n - stack_offset);
-                 if (type_name)
-                   fprintf(faction, ".%s", type_name);
-                 if(!type_name && typed)
-                   complain (_("$%d of `%s' has no declared type"),
-                             n, rule->sym->tag);
-                 continue;
-               }
-             else
-               complain (_("$%s is invalid"), printable_version (c));
+  token = lex ();

 
 

-             break;
+  if (token != tok_typename)
+    {
+      complain (_("invalid %s declaration"), "%type");
+      return t;
+    }

 
 

-           case '@':
-             copy_at (finput, faction, stack_offset);
-             break;
+  name = xstrdup (token_buffer);

 
 

-           case EOF:
-             fatal (_("unmatched %s"), "`{'");
+  for (;;)
+    {
+      token = lex ();

 
 

-           default:
-             putc(c, faction);
-           }
+      switch (token)
+       {
+       case tok_semicolon:
+         return lex ();

 
 

-          c = getc(finput);
-        }
+       case tok_comma:
+         break;

 
 

-      /* above loop exits when c is '}' */
+       case tok_identifier:
+         if (symval->type_name == NULL)
+           symval->type_name = name;
+         else if (strcmp (name, symval->type_name) != 0)
+           complain (_("type redeclaration for %s"), symval->tag);

 
 

-      if (--count)
-        {
-         putc(c, faction);
-         c = getc(finput);
+         break;
+
+       default:
+         return token;

        }
     }
        }
     }

-
-  fprintf(faction, ";\n    break;}");
-}
-
-
-
-/* generate a dummy symbol, a nonterminal,
-whose name cannot conflict with the user's names. */
-
-bucket *
-gensym (void)
-{
-  register bucket *sym;
-
-  sprintf (token_buffer, "@%d", ++gensym_count);
-  sym = getsym(token_buffer);
-  sym->class = SNTERM;
-  sym->value = nvars++;
-  return sym;

 }
 
 }
 

-/* Parse the input grammar into a one symbol_list structure.
-Each rule is represented by a sequence of symbols: the left hand side
-followed by the contents of the right hand side, followed by a null pointer
-instead of a symbol to terminate the rule.
-The next symbol is the lhs of the following rule.
-
-All guards and actions are copied out to the appropriate files,
-labelled by the rule number they apply to.  */
+#endif
+\f
+/*------------------------------------------------------------------.
+| Parse the input grammar into a one symbol_list structure.  Each   |
+| rule is represented by a sequence of symbols: the left hand side  |
+| followed by the contents of the right hand side, followed by a    |
+| null pointer instead of a symbol to terminate the rule.  The next |
+| symbol is the lhs of the following rule.                          |
+|                                                                   |
+| All guards and actions are copied out to the appropriate files,   |
+| labelled by the rule number they apply to.                        |
+`------------------------------------------------------------------*/

 
 

-void
+static void

 readgram (void)
 {
 readgram (void)
 {

-  register int t;
-  register bucket *lhs = NULL;
-  register symbol_list *p;
-  register symbol_list *p1;
-  register bucket *bp;
+  token_t t;
+  bucket *lhs = NULL;
+  symbol_list *p;
+  symbol_list *p1;
+  bucket *bp;

 
 

-  symbol_list *crule;  /* points to first symbol_list of current rule.  */
-                       /* its symbol is the lhs of the rule.   */
-  symbol_list *crule1;  /* points to the symbol_list preceding crule.  */
+  /* Points to first symbol_list of current rule. its symbol is the
+     lhs of the rule.  */
+  symbol_list *crule;
+  /* Points to the symbol_list preceding crule.  */
+  symbol_list *crule1;

 
   p1 = NULL;
 
 
   p1 = NULL;
 

-  t = lex();
+  t = lex ();

 
 

-  while (t != TWO_PERCENTS && t != ENDFILE)
+  while (t != tok_two_percents && t != tok_eof)

     {
     {

-      if (t == IDENTIFIER || t == BAR)
+      if (t == tok_identifier || t == tok_bar)

        {
        {

-         register int actionflag = 0;
-         int rulelength = 0;  /* number of symbols in rhs of this rule so far  */
+         int action_flag = 0;
+         /* Number of symbols in rhs of this rule so far */
+         int rulelength = 0;

          int xactions = 0;     /* JF for error checking */
          bucket *first_rhs = 0;
 
          int xactions = 0;     /* JF for error checking */
          bucket *first_rhs = 0;
 

-         if (t == IDENTIFIER)
+         if (t == tok_identifier)

            {
              lhs = symval;
 
            {
              lhs = symval;
 


@@ -1356,15 +1291,15 @@ readgram (void)
                  start_flag = 1;
                }
 
                  start_flag = 1;
                }
 

-             t = lex();
-             if (t != COLON)
+             t = lex ();
+             if (t != tok_colon)

                {
                  complain (_("ill-formed rule: initial symbol not followed by colon"));
                {
                  complain (_("ill-formed rule: initial symbol not followed by colon"));

-                 unlex(t);
+                 unlex (t);

                }
            }
 
                }
            }
 

-         if (nrules == 0 && t == BAR)
+         if (nrules == 0 && t == tok_bar)

            {
              complain (_("grammar starts with vertical bar"));
              lhs = symval;     /* BOGUS: use a random symval */
            {
              complain (_("grammar starts with vertical bar"));
              lhs = symval;     /* BOGUS: use a random symval */


@@ -1376,7 +1311,7 @@ readgram (void)
 
          record_rule_line ();
 
 
          record_rule_line ();
 

-         p = NEW(symbol_list);
+         p = XCALLOC (symbol_list, 1);

          p->sym = lhs;
 
          crule1 = p1;
          p->sym = lhs;
 
          crule1 = p1;


@@ -1390,61 +1325,63 @@ readgram (void)
 
          /* mark the rule's lhs as a nonterminal if not already so.  */
 
 
          /* mark the rule's lhs as a nonterminal if not already so.  */
 

-         if (lhs->class == SUNKNOWN)
+         if (lhs->class == unknown_sym)

            {
            {

-             lhs->class = SNTERM;
+             lhs->class = nterm_sym;

              lhs->value = nvars;
              nvars++;
            }
              lhs->value = nvars;
              nvars++;
            }

-         else if (lhs->class == STOKEN)
+         else if (lhs->class == token_sym)

            complain (_("rule given for %s, which is a token"), lhs->tag);
 
          /* read the rhs of the rule.  */
 
          for (;;)
            {
            complain (_("rule given for %s, which is a token"), lhs->tag);
 
          /* read the rhs of the rule.  */
 
          for (;;)
            {

-             t = lex();
-             if (t == PREC)
+             t = lex ();
+             if (t == tok_prec)

                {
                {

-                 t = lex();
+                 t = lex ();

                  crule->ruleprec = symval;
                  crule->ruleprec = symval;

-                 t = lex();
+                 t = lex ();

                }
 
                }
 

-             if (! (t == IDENTIFIER || t == LEFT_CURLY)) break;
+             if (!(t == tok_identifier || t == tok_left_curly))
+               break;

 
              /* If next token is an identifier, see if a colon follows it.
 
              /* If next token is an identifier, see if a colon follows it.

-                If one does, exit this rule now.  */
-             if (t == IDENTIFIER)
+                If one does, exit this rule now.  */
+             if (t == tok_identifier)

                {
                {

-                 register bucket *ssave;
-                 register int t1;
+                 bucket *ssave;
+                 token_t t1;

 
                  ssave = symval;
 
                  ssave = symval;

-                 t1 = lex();
-                 unlex(t1);
+                 t1 = lex ();
+                 unlex (t1);

                  symval = ssave;
                  symval = ssave;

-                 if (t1 == COLON) break;
+                 if (t1 == tok_colon)
+                   break;

 
 

-                 if(!first_rhs)        /* JF */
+                 if (!first_rhs)       /* JF */

                    first_rhs = symval;
                  /* Not followed by colon =>
                     process as part of this rule's rhs.  */
                }
 
              /* If we just passed an action, that action was in the middle
                    first_rhs = symval;
                  /* Not followed by colon =>
                     process as part of this rule's rhs.  */
                }
 
              /* If we just passed an action, that action was in the middle

-                of a rule, so make a dummy rule to reduce it to a
-                non-terminal.  */
-             if (actionflag)
+                of a rule, so make a dummy rule to reduce it to a
+                non-terminal.  */
+             if (action_flag)

                {
                {

-                 register bucket *sdummy;
+                 bucket *sdummy;

 
 

-                 /* Since the action was written out with this rule's */
-                 /* number, we must give the new rule this number */
-                 /* by inserting the new rule before it.  */
+                 /* Since the action was written out with this rule's
+                    number, we must give the new rule this number by
+                    inserting the new rule before it.  */

 
                  /* Make a dummy nonterminal, a gensym.  */
 
                  /* Make a dummy nonterminal, a gensym.  */

-                 sdummy = gensym();
+                 sdummy = gensym ();

 
                  /* Make a new rule, whose body is empty,
                     before the current one, so that the action
 
                  /* Make a new rule, whose body is empty,
                     before the current one, so that the action


@@ -1452,134 +1389,134 @@ readgram (void)
                  nrules++;
                  nitems++;
                  record_rule_line ();
                  nrules++;
                  nitems++;
                  record_rule_line ();

-                 p = NEW(symbol_list);
+                 p = XCALLOC (symbol_list, 1);

                  if (crule1)
                    crule1->next = p;
                  if (crule1)
                    crule1->next = p;

-                 else grammar = p;
+                 else
+                   grammar = p;

                  p->sym = sdummy;
                  p->sym = sdummy;

-                 crule1 = NEW(symbol_list);
+                 crule1 = XCALLOC (symbol_list, 1);

                  p->next = crule1;
                  crule1->next = crule;
 
                  p->next = crule1;
                  crule1->next = crule;
 

-                 /* insert the dummy generated by that rule into this rule.  */
+                 /* Insert the dummy generated by that rule into this
+                    rule.  */

                  nitems++;
                  nitems++;

-                 p = NEW(symbol_list);
+                 p = XCALLOC (symbol_list, 1);

                  p->sym = sdummy;
                  p1->next = p;
                  p1 = p;
 
                  p->sym = sdummy;
                  p1->next = p;
                  p1 = p;
 

-                 actionflag = 0;
+                 action_flag = 0;

                }
 
                }
 

-             if (t == IDENTIFIER)
+             if (t == tok_identifier)

                {
                  nitems++;
                {
                  nitems++;

-                 p = NEW(symbol_list);
+                 p = XCALLOC (symbol_list, 1);

                  p->sym = symval;
                  p1->next = p;
                  p1 = p;
                }
                  p->sym = symval;
                  p1->next = p;
                  p1 = p;
                }

-             else /* handle an action.  */
+             else              /* handle an action.  */

                {
                {

-                 copy_action(crule, rulelength);
-                 actionflag = 1;
+                 copy_action (crule, rulelength);
+                 action_flag = 1;

                  xactions++;   /* JF */
                }
              rulelength++;
                  xactions++;   /* JF */
                }
              rulelength++;

-           }   /* end of  read rhs of rule */
+           }                   /* end of  read rhs of rule */

 
          /* Put an empty link in the list to mark the end of this rule  */
 
          /* Put an empty link in the list to mark the end of this rule  */

-         p = NEW(symbol_list);
+         p = XCALLOC (symbol_list, 1);

          p1->next = p;
          p1 = p;
 
          p1->next = p;
          p1 = p;
 

-         if (t == PREC)
+         if (t == tok_prec)

            {
              complain (_("two @prec's in a row"));
            {
              complain (_("two @prec's in a row"));

-             t = lex();
+             t = lex ();

              crule->ruleprec = symval;
              crule->ruleprec = symval;

-             t = lex();
+             t = lex ();

            }
            }

-         if (t == GUARD)
+         if (t == tok_guard)

            {
            {

-             if (! semantic_parser)
-               complain ("%s",
-                         _("%guard present but %semantic_parser not specified"));
+             if (!semantic_parser)
+               complain (_("%%guard present but %%semantic_parser not specified"));

 
 

-             copy_guard(crule, rulelength);
-             t = lex();
+             copy_guard (crule, rulelength);
+             t = lex ();

            }
            }

-         else if (t == LEFT_CURLY)
+         else if (t == tok_left_curly)

            {
            {

-               /* This case never occurs -wjh */
-             if (actionflag)
+             /* This case never occurs -wjh */
+             if (action_flag)

                complain (_("two actions at end of one rule"));
                complain (_("two actions at end of one rule"));

-             copy_action(crule, rulelength);
-             actionflag = 1;
+             copy_action (crule, rulelength);
+             action_flag = 1;

              xactions++;       /* -wjh */
              xactions++;       /* -wjh */

-             t = lex();
+             t = lex ();

            }
          /* If $$ is being set in default way, report if any type
             mismatch.  */
          else if (!xactions
            }
          /* If $$ is being set in default way, report if any type
             mismatch.  */
          else if (!xactions

-                  && first_rhs
-                  && lhs->type_name != first_rhs->type_name)
+                  && first_rhs && lhs->type_name != first_rhs->type_name)

            {
              if (lhs->type_name == 0
                  || first_rhs->type_name == 0
            {
              if (lhs->type_name == 0
                  || first_rhs->type_name == 0

-                 || strcmp(lhs->type_name,first_rhs->type_name))
+                 || strcmp (lhs->type_name, first_rhs->type_name))

                complain (_("type clash (`%s' `%s') on default action"),
                          lhs->type_name ? lhs->type_name : "",
                complain (_("type clash (`%s' `%s') on default action"),
                          lhs->type_name ? lhs->type_name : "",

-                            first_rhs->type_name ? first_rhs->type_name : "");
+                         first_rhs->type_name ? first_rhs->type_name : "");

            }
          /* Warn if there is no default for $$ but we need one.  */
          else if (!xactions && !first_rhs && lhs->type_name != 0)
            complain (_("empty rule for typed nonterminal, and no action"));
            }
          /* Warn if there is no default for $$ but we need one.  */
          else if (!xactions && !first_rhs && lhs->type_name != 0)
            complain (_("empty rule for typed nonterminal, and no action"));

-         if (t == SEMICOLON)
-           t = lex();
+         if (t == tok_semicolon)
+           t = lex ();

        }
 #if 0
        }
 #if 0

-  /* these things can appear as alternatives to rules.  */
+      /* these things can appear as alternatives to rules.  */

 /* NO, they cannot.
        a) none of the documentation allows them
        b) most of them scan forward until finding a next %
                thus they may swallow lots of intervening rules
 */
 /* NO, they cannot.
        a) none of the documentation allows them
        b) most of them scan forward until finding a next %
                thus they may swallow lots of intervening rules
 */

-      else if (t == TOKEN)
+      else if (t == tok_token)

        {
        {

-         parse_token_decl(STOKEN, SNTERM);
-         t = lex();
+         parse_token_decl (token_sym, nterm_sym);
+         t = lex ();

        }
        }

-      else if (t == NTERM)
+      else if (t == tok_nterm)

        {
        {

-         parse_token_decl(SNTERM, STOKEN);
-         t = lex();
+         parse_token_decl (nterm_sym, token_sym);
+         t = lex ();

        }
        }

-      else if (t == TYPE)
+      else if (t == tok_type)

        {
        {

-         t = get_type();
+         t = get_type ();

        }
        }

-      else if (t == UNION)
+      else if (t == tok_union)

        {
        {

-         parse_union_decl();
-         t = lex();
+         parse_union_decl ();
+         t = lex ();

        }
        }

-      else if (t == EXPECT)
+      else if (t == tok_expect)

        {
        {

-         parse_expect_decl();
-         t = lex();
+         parse_expect_decl ();
+         t = lex ();

        }
        }

-      else if (t == START)
+      else if (t == tok_start)

        {
        {

-         parse_start_decl();
-         t = lex();
+         parse_start_decl ();
+         t = lex ();

        }
 #endif
 
       else
        {
          complain (_("invalid input: %s"), token_buffer);
        }
 #endif
 
       else
        {
          complain (_("invalid input: %s"), token_buffer);

-         t = lex();
+         t = lex ();

        }
     }
 
        }
     }
 


@@ -1591,125 +1528,119 @@ readgram (void)
   if (nrules == 0)
     fatal (_("no rules in the input grammar"));
 
   if (nrules == 0)
     fatal (_("no rules in the input grammar"));
 

-  if (typed == 0       /* JF put out same default YYSTYPE as YACC does */
+  /* JF put out same default YYSTYPE as YACC does */
+  if (typed == 0

       && !value_components_used)
     {
       /* We used to use `unsigned long' as YYSTYPE on MSDOS,
       && !value_components_used)
     {
       /* We used to use `unsigned long' as YYSTYPE on MSDOS,

-        but it seems better to be consistent.
-        Most programs should declare their own type anyway.  */
-      fprintf(fattrs, "#ifndef YYSTYPE\n#define YYSTYPE int\n#endif\n");
-      if (fdefines)
-       fprintf(fdefines, "#ifndef YYSTYPE\n#define YYSTYPE int\n#endif\n");
+         but it seems better to be consistent.
+         Most programs should declare their own type anyway.  */
+      obstack_sgrow (&attrs_obstack,
+                          "#ifndef YYSTYPE\n#define YYSTYPE int\n#endif\n");
+      if (defines_flag)
+       obstack_sgrow (&defines_obstack, "\
+#ifndef YYSTYPE\n\
+# define YYSTYPE int\n\
+#endif\n");

     }
 
   /* Report any undefined symbols and consider them nonterminals.  */
 
   for (bp = firstsymbol; bp; bp = bp->next)
     }
 
   /* Report any undefined symbols and consider them nonterminals.  */
 
   for (bp = firstsymbol; bp; bp = bp->next)

-    if (bp->class == SUNKNOWN)
+    if (bp->class == unknown_sym)

       {
       {

-       complain (_("symbol %s is used, but is not defined as a token and has no rules"),
+       complain (_
+                 ("symbol %s is used, but is not defined as a token and has no rules"),

                  bp->tag);
                  bp->tag);

-       bp->class = SNTERM;
+       bp->class = nterm_sym;

        bp->value = nvars++;
       }
 
   ntokens = nsyms - nvars;
 }
        bp->value = nvars++;
       }
 
   ntokens = nsyms - nvars;
 }

+\f
+/*--------------------------------------------------------------.
+| For named tokens, but not literal ones, define the name.  The |
+| value is the user token number.                               |
+`--------------------------------------------------------------*/

 
 

-
-void
-record_rule_line (void)
-{
-  /* Record each rule's source line number in rline table.  */
-
-  if (nrules >= rline_allocated)
-    {
-      rline_allocated = nrules * 2;
-      rline = (short *) xrealloc ((char *) rline,
-                                 rline_allocated * sizeof (short));
-    }
-  rline[nrules] = lineno;
-}
-
-
-#if 0
-/* read in a %type declaration and record its information for get_type_name to access */
-/* this is unused.  it is only called from the #if 0 part of readgram */
-static int
-get_type (void)
+static void
+output_token_defines (struct obstack *oout)

 {
 {

-  register int k;
-  register int t;
-  register char *name;
-
-  t = lex();
-
-  if (t != TYPENAME)
-    {
-      complain (_("invalid %s declaration"), "%type");
-      return t;
-    }
-
-  k = strlen(token_buffer);
-  name = NEW2(k + 1, char);
-  strcpy(name, token_buffer);
+  bucket *bp;
+  char *cp, *symbol;
+  char c;

 
 

-  for (;;)
+  for (bp = firstsymbol; bp; bp = bp->next)

     {
     {

-      t = lex();
-
-      switch (t)
+      symbol = bp->tag;                /* get symbol */
+
+      if (bp->value >= ntokens)
+       continue;
+      if (bp->user_token_number == SALIAS)
+       continue;
+      if ('\'' == *symbol)
+       continue;               /* skip literal character */
+      if (bp == errtoken)
+       continue;               /* skip error token */
+      if ('\"' == *symbol)

        {
        {

-       case SEMICOLON:
-         return lex();
-
-       case COMMA:
-         break;
-
-       case IDENTIFIER:
-         if (symval->type_name == NULL)
-           symval->type_name = name;
-         else if (strcmp(name, symval->type_name) != 0)
-           complain (_("type redeclaration for %s"), symval->tag);
+         /* use literal string only if given a symbol with an alias */
+         if (bp->alias)
+           symbol = bp->alias->tag;
+         else
+           continue;
+       }

 
 

-         break;
+      /* Don't #define nonliteral tokens whose names contain periods.  */
+      cp = symbol;
+      while ((c = *cp++) && c != '.');
+      if (c != '\0')
+       continue;

 
 

-       default:
-         return t;
-       }
+      obstack_fgrow2 (oout, "#define\t%s\t%d\n",
+                     symbol,
+                     ((translations && !raw_flag)
+                      ? bp->user_token_number : bp->value));
+      if (semantic_parser)
+       obstack_fgrow2 (oout, "#define\tT%s\t%d\n", symbol, bp->value);

     }
     }

+
+  obstack_1grow (oout, '\n');

 }
 }

-#endif

 
 
 
 

-/* Assign symbol numbers, and write definition of token names into
-   fdefines.  Set up vectors tags and sprec of names and precedences
-   of symbols.  */
+/*------------------------------------------------------------------.
+| Assign symbol numbers, and write definition of token names into   |
+| FDEFINES.  Set up vectors TAGS and SPREC of names and precedences |
+| of symbols.                                                       |
+`------------------------------------------------------------------*/

 
 

-void
+static void

 packsymbols (void)
 {
 packsymbols (void)
 {

-  register bucket *bp;
-  register int tokno = 1;
-  register int i;
-  register int last_user_token_number;
+  bucket *bp;
+  int tokno = 1;
+  int i;
+  int last_user_token_number;
+  static char DOLLAR[] = "$";

 
   /* int lossage = 0; JF set but not used */
 
 
   /* int lossage = 0; JF set but not used */
 

-  tags = NEW2(nsyms + 1, char *);
-  tags[0] = "$";
-  user_toknums = NEW2(nsyms + 1, int);
+  tags = XCALLOC (char *, nsyms + 1);
+  tags[0] = DOLLAR;
+  user_toknums = XCALLOC (short, nsyms + 1);

   user_toknums[0] = 0;
 
   user_toknums[0] = 0;
 

-  sprec = NEW2(nsyms, short);
-  sassoc = NEW2(nsyms, short);
+  sprec = XCALLOC (short, nsyms);
+  sassoc = XCALLOC (short, nsyms);

 
   max_user_token_number = 256;
   last_user_token_number = 256;
 
   for (bp = firstsymbol; bp; bp = bp->next)
     {
 
   max_user_token_number = 256;
   last_user_token_number = 256;
 
   for (bp = firstsymbol; bp; bp = bp->next)
     {

-      if (bp->class == SNTERM)
+      if (bp->class == nterm_sym)

        {
          bp->value += ntokens;
        }
        {
          bp->value += ntokens;
        }


@@ -1746,15 +1677,15 @@ packsymbols (void)
            }
 
          if (bp->user_token_number == SALIAS)
            }
 
          if (bp->user_token_number == SALIAS)

-           continue;  /* do not do processing below for SALIASs */
+           continue;           /* do not do processing below for SALIASs */

 
 

-       }
-      else  /* bp->class == STOKEN */
+       }
+      else                     /* bp->class == token_sym */

        {
          bp->value = tokno++;
        }
 
        {
          bp->value = tokno++;
        }
 

-      if (bp->class == STOKEN)
+      if (bp->class == token_sym)

        {
          if (translations && !(bp->user_token_number))
            bp->user_token_number = ++last_user_token_number;
        {
          if (translations && !(bp->user_token_number))
            bp->user_token_number = ++last_user_token_number;


@@ -1771,53 +1702,54 @@ packsymbols (void)
 
   if (translations)
     {
 
   if (translations)
     {

-      register int i;
+      int j;

 
 

-      token_translations = NEW2(max_user_token_number+1, short);
+      token_translations = XCALLOC (short, max_user_token_number + 1);

 
       /* initialize all entries for literal tokens to 2, the internal
 
       /* initialize all entries for literal tokens to 2, the internal

-        token number for $undefined., which represents all invalid
-        inputs.  */
-      for (i = 0; i <= max_user_token_number; i++)
-        token_translations[i] = 2;
+         token number for $undefined., which represents all invalid
+         inputs.  */
+      for (j = 0; j <= max_user_token_number; j++)
+       token_translations[j] = 2;

 
       for (bp = firstsymbol; bp; bp = bp->next)
 
       for (bp = firstsymbol; bp; bp = bp->next)

-        {
-          if (bp->value >= ntokens)
-           continue;             /* non-terminal */
-          if (bp->user_token_number == SALIAS)
+       {
+         if (bp->value >= ntokens)
+           continue;           /* non-terminal */
+         if (bp->user_token_number == SALIAS)

            continue;
            continue;

-          if (token_translations[bp->user_token_number] != 2)
+         if (token_translations[bp->user_token_number] != 2)

            complain (_("tokens %s and %s both assigned number %d"),
                      tags[token_translations[bp->user_token_number]],
            complain (_("tokens %s and %s both assigned number %d"),
                      tags[token_translations[bp->user_token_number]],

-                 bp->tag,
-                 bp->user_token_number);
-          token_translations[bp->user_token_number] = bp->value;
-        }
+                     bp->tag, bp->user_token_number);
+         token_translations[bp->user_token_number] = bp->value;
+       }

     }
 
   error_token_number = errtoken->value;
 
     }
 
   error_token_number = errtoken->value;
 

-  if (! noparserflag)
-    output_token_defines(ftable);
+  if (!no_parser_flag)
+    output_token_defines (&table_obstack);

 
 

-  if (startval->class == SUNKNOWN)
+  if (startval->class == unknown_sym)

     fatal (_("the start symbol %s is undefined"), startval->tag);
     fatal (_("the start symbol %s is undefined"), startval->tag);

-  else if (startval->class == STOKEN)
+  else if (startval->class == token_sym)

     fatal (_("the start symbol %s is a token"), startval->tag);
 
   start_symbol = startval->value;
 
     fatal (_("the start symbol %s is a token"), startval->tag);
 
   start_symbol = startval->value;
 

-  if (definesflag)
+  if (defines_flag)

     {
     {

-      output_token_defines(fdefines);
+      output_token_defines (&defines_obstack);

 
       if (!pure_parser)
        {
          if (spec_name_prefix)
 
       if (!pure_parser)
        {
          if (spec_name_prefix)

-           fprintf(fdefines, "\nextern YYSTYPE %slval;\n", spec_name_prefix);
+           obstack_fgrow1 (&defines_obstack, "\nextern YYSTYPE %slval;\n",
+                           spec_name_prefix);

          else
          else

-           fprintf(fdefines, "\nextern YYSTYPE yylval;\n");
+           obstack_sgrow (&defines_obstack,
+                                "\nextern YYSTYPE yylval;\n");

        }
 
       if (semantic_parser)
        }
 
       if (semantic_parser)


@@ -1825,80 +1757,39 @@ packsymbols (void)
          {
            /* don't make these for dummy nonterminals made by gensym.  */
            if (*tags[i] != '@')
          {
            /* don't make these for dummy nonterminals made by gensym.  */
            if (*tags[i] != '@')

-             fprintf(fdefines, "#define\tNT%s\t%d\n", tags[i], i);
+              obstack_fgrow2 (&defines_obstack,
+                              "#define\tNT%s\t%d\n", tags[i], i);

          }
 #if 0
       /* `fdefines' is now a temporary file, so we need to copy its
          contents in `done', so we can't close it here.  */
          }
 #if 0
       /* `fdefines' is now a temporary file, so we need to copy its
          contents in `done', so we can't close it here.  */

-      fclose(fdefines);
+      fclose (fdefines);

       fdefines = NULL;
 #endif
     }
 }
 
       fdefines = NULL;
 #endif
     }
 }
 

-/* For named tokens, but not literal ones, define the name.  The value
-   is the user token number.  */
-
-void
-output_token_defines (FILE *file)
-{
-  bucket *bp;
-  register char *cp, *symbol;
-  register char c;
-
-  for (bp = firstsymbol; bp; bp = bp->next)
-    {
-      symbol = bp->tag;                                /* get symbol */
-
-      if (bp->value >= ntokens) continue;
-      if (bp->user_token_number == SALIAS) continue;
-      if ('\'' == *symbol) continue;   /* skip literal character */
-      if (bp == errtoken) continue;    /* skip error token */
-      if ('\"' == *symbol)
-       {
-               /* use literal string only if given a symbol with an alias */
-               if (bp->alias)
-                       symbol = bp->alias->tag;
-               else
-                       continue;
-       }
-
-      /* Don't #define nonliteral tokens whose names contain periods.  */
-      cp = symbol;
-      while ((c = *cp++) && c != '.');
-      if (c != '\0')  continue;
-
-      fprintf (file, "#define\t%s\t%d\n", symbol,
-              ((translations && ! rawtoknumflag)
-               ? bp->user_token_number
-               : bp->value));
-      if (semantic_parser)
-        fprintf (file, "#define\tT%s\t%d\n", symbol, bp->value);
-    }
-
-  putc('\n', file);
-}
-

 
 

+/*---------------------------------------------------------------.
+| Convert the rules into the representation using RRHS, RLHS and |
+| RITEMS.                                                        |
+`---------------------------------------------------------------*/

 
 

-/* convert the rules into the representation using rrhs, rlhs and ritems.  */
-
-void
+static void

 packgram (void)
 {
 packgram (void)
 {

-  register int itemno;
-  register int ruleno;
-  register symbol_list *p;
-/*  register bucket *bp; JF unused */
+  int itemno;
+  int ruleno;
+  symbol_list *p;

 
   bucket *ruleprec;
 
 
   bucket *ruleprec;
 

-  ritem = NEW2(nitems + 1, short);
-  rlhs = NEW2(nrules, short) - 1;
-  rrhs = NEW2(nrules, short) - 1;
-  rprec = NEW2(nrules, short) - 1;
-  rprecsym = NEW2(nrules, short) - 1;
-  rassoc = NEW2(nrules, short) - 1;
+  ritem = XCALLOC (short, nitems + 1);
+  rlhs = XCALLOC (short, nrules) - 1;
+  rrhs = XCALLOC (short, nrules) - 1;
+  rprec = XCALLOC (short, nrules) - 1;
+  rprecsym = XCALLOC (short, nrules) - 1;
+  rassoc = XCALLOC (short, nrules) - 1;

 
   itemno = 0;
   ruleno = 1;
 
   itemno = 0;
   ruleno = 1;


@@ -1916,54 +1807,147 @@ packgram (void)
          ritem[itemno++] = p->sym->value;
          /* A rule gets by default the precedence and associativity
             of the last token in it.  */
          ritem[itemno++] = p->sym->value;
          /* A rule gets by default the precedence and associativity
             of the last token in it.  */

-          if (p->sym->class == STOKEN)
+         if (p->sym->class == token_sym)

            {
              rprec[ruleno] = p->sym->prec;
              rassoc[ruleno] = p->sym->assoc;
            }
            {
              rprec[ruleno] = p->sym->prec;
              rassoc[ruleno] = p->sym->assoc;
            }

-         if (p) p = p->next;
+         if (p)
+           p = p->next;

        }
 
       /* If this rule has a %prec,
        }
 
       /* If this rule has a %prec,

-        the specified symbol's precedence replaces the default.  */
+         the specified symbol's precedence replaces the default.  */

       if (ruleprec)
        {
       if (ruleprec)
        {

-          rprec[ruleno] = ruleprec->prec;
-          rassoc[ruleno] = ruleprec->assoc;
+         rprec[ruleno] = ruleprec->prec;
+         rassoc[ruleno] = ruleprec->assoc;

          rprecsym[ruleno] = ruleprec->value;
        }
 
       ritem[itemno++] = -ruleno;
       ruleno++;
 
          rprecsym[ruleno] = ruleprec->value;
        }
 
       ritem[itemno++] = -ruleno;
       ruleno++;
 

-      if (p) p = p->next;
+      if (p)
+       p = p->next;

     }
 
   ritem[itemno] = 0;
 }
 \f
     }
 
   ritem[itemno] = 0;
 }
 \f

-/* Read a signed integer from STREAM and return its value.  */
+/*-------------------------------------------------------------------.
+| Read in the grammar specification and record it in the format      |
+| described in gram.h.  All guards are copied into the GUARD_OBSTACK |
+| and all actions into ACTION_OBSTACK, in each case forming the body |
+| of a C function (YYGUARD or YYACTION) which contains a switch      |
+| statement to decide which guard or action to execute.              |
+`-------------------------------------------------------------------*/

 
 

-int
-read_signed_integer (FILE *stream)
+void
+reader (void)

 {
 {

-  register int c = getc(stream);
-  register int sign = 1;
-  register int n;
+  start_flag = 0;
+  startval = NULL;             /* start symbol not specified yet. */

 
 

-  if (c == '-')
-    {
-      c = getc(stream);
-      sign = -1;
-    }
-  n = 0;
-  while (isdigit(c))
-    {
-      n = 10*n + (c - '0');
-      c = getc(stream);
-    }
+#if 0
+  /* initially assume token number translation not needed.  */
+  translations = 0;
+#endif
+  /* Nowadays translations is always set to 1, since we give `error' a
+     user-token-number to satisfy the Posix demand for YYERRCODE==256.
+   */
+  translations = 1;
+
+  nsyms = 1;
+  nvars = 0;
+  nrules = 0;
+  nitems = 0;
+  rline_allocated = 10;
+  rline = XCALLOC (short, rline_allocated);
+
+  typed = 0;
+  lastprec = 0;
+
+  semantic_parser = 0;
+  pure_parser = 0;
+
+  grammar = NULL;
+
+  init_lex ();
+  lineno = 1;
+
+  /* Initialize the symbol table.  */
+  tabinit ();
+  /* Construct the error token */
+  errtoken = getsym ("error");
+  errtoken->class = token_sym;
+  errtoken->user_token_number = 256;   /* Value specified by POSIX.  */
+  /* Construct a token that represents all undefined literal tokens.
+     It is always token number 2.  */
+  undeftoken = getsym ("$undefined.");
+  undeftoken->class = token_sym;
+  undeftoken->user_token_number = 2;
+
+  /* Read the declaration section.  Copy %{ ... %} groups to
+     TABLE_OBSTACK and FDEFINES file.  Also notice any %token, %left,
+     etc. found there.  */
+  obstack_1grow (&table_obstack, '\n');
+  obstack_fgrow3 (&table_obstack, "\
+/* %s, made from %s\n\
+   by GNU bison %s.  */\n\
+\n",
+                 no_parser_flag ? "Bison-generated parse tables" : "A Bison parser",
+                 infile, VERSION);
+
+  obstack_sgrow (&table_obstack,
+                      "#define YYBISON 1  /* Identify Bison output.  */\n\n");
+  read_declarations ();
+  /* Start writing the guard and action files, if they are needed.  */
+  output_headers ();
+  /* Read in the grammar, build grammar in list form.  Write out
+     guards and actions.  */
+  readgram ();
+  /* Now we know whether we need the line-number stack.  If we do,
+     write its type into the .tab.h file.  */
+  if (defines_flag)
+    reader_output_yylsp (&defines_obstack);
+  /* Write closing delimiters for actions and guards.  */
+  output_trailers ();
+  if (locations_flag)
+    obstack_sgrow (&table_obstack, "#define YYLSP_NEEDED 1\n\n");
+  /* Assign the symbols their symbol numbers.  Write #defines for the
+     token symbols into FDEFINES if requested.  */
+  packsymbols ();
+  /* Convert the grammar into the format described in gram.h.  */
+  packgram ();
+  /* Free the symbol table data structure since symbols are now all
+     referred to by symbol number.  */
+  free_symtab ();
+}

 
 

-  ungetc(c, stream);

 
 

-  return n * sign;
+/*------------------------------------------------------------------.
+| Define YYLTYPE.  Cannot be in the skeleton since we might have to |
+| output it in the headers if --defines is used.                    |
+`------------------------------------------------------------------*/
+
+void
+reader_output_yylsp (struct obstack *oout)
+{
+  if (locations_flag)
+    obstack_sgrow (oout, "\
+\n\
+#ifndef YYLTYPE\n\
+typedef struct yyltype\n\
+{\n\
+  int first_line;\n\
+  int first_column;\n\
+\n\
+  int last_line;\n\
+  int last_column;\n\
+} yyltype;\n\
+\n\
+# define YYLTYPE yyltype\n\
+#endif\n\
+\n");

 }
 }