Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@406 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 1950 insertions, 0 deletions

diff --git a/gcc/c-lex.c b/gcc/c-lex.c
new file mode 100644
index 00000000000..a78135be810
--- /dev/null
+++ b/gcc/c-lex.c
@@ -0,0 +1,1950 @@
+/* Lexical analyser for C and Objective C.
+   Copyright (C) 1987, 1988, 1989, 1992 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include <stdio.h>
+#include <errno.h>
+#include <setjmp.h>
+
+#include "config.h"
+#include "rtl.h"
+#include "tree.h"
+#include "input.h"
+#include "c-lex.h"
+#include "c-tree.h"
+#include "flags.h"
+#include "c-parse.h"
+
+#ifdef MULTIBYTE_CHARS
+#include <stdlib.h>
+#include <locale.h>
+#endif
+
+#ifndef errno
+extern int errno;
+#endif
+
+/* The elements of `ridpointers' are identifier nodes
+   for the reserved type names and storage classes.
+   It is indexed by a RID_... value.  */
+tree ridpointers[(int) RID_MAX];
+
+/* Cause the `yydebug' variable to be defined.  */
+#define YYDEBUG 1
+
+/* the declaration found for the last IDENTIFIER token read in.
+   yylex must look this up to detect typedefs, which get token type TYPENAME,
+   so it is left around in case the identifier is not a typedef but is
+   used in a context which makes it a reference to a variable.  */
+tree lastiddecl;
+
+/* Nonzero enables objc features.  */
+
+int doing_objc_thang;
+
+extern tree lookup_interface ();
+
+extern int yydebug;
+
+/* File used for outputting assembler code.  */
+extern FILE *asm_out_file;
+
+#ifndef WCHAR_TYPE_SIZE
+#ifdef INT_TYPE_SIZE
+#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
+#else
+#define WCHAR_TYPE_SIZE	BITS_PER_WORD
+#endif
+#endif
+
+/* Number of bytes in a wide character.  */
+#define WCHAR_BYTES (WCHAR_TYPE_SIZE / BITS_PER_UNIT)
+
+static int maxtoken;		/* Current nominal length of token buffer.  */
+char *token_buffer;	/* Pointer to token buffer.
+			   Actual allocated length is maxtoken + 2.
+			   This is not static because objc-parse.y uses it.  */
+
+/* Nonzero if end-of-file has been seen on input.  */
+static int end_of_file;
+
+/* Buffered-back input character; faster than using ungetc.  */
+static int nextchar = -1;
+
+int check_newline ();
+
+/* Nonzero tells yylex to ignore \ in string constants.  */
+static int ignore_escape_flag = 0;
+
+/* C code produced by gperf version 2.5 (GNU C++ version) */
+/* Command-line: gperf -p -j1 -i 1 -g -o -t -N is_reserved_word -k1,3,$ c-parse.gperf  */ 
+struct resword { char *name; short token; enum rid rid; };
+
+#define TOTAL_KEYWORDS 53
+#define MIN_WORD_LENGTH 2
+#define MAX_WORD_LENGTH 13
+#define MIN_HASH_VALUE 7
+#define MAX_HASH_VALUE 102
+/* maximum key range = 96, duplicates = 0 */
+
+#ifdef __GNUC__
+__inline
+#endif
+static unsigned int
+hash (str, len)
+     register char *str;
+     register int unsigned len;
+{
+  static unsigned char asso_values[] =
+    {
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103, 103, 103, 103, 103, 103,
+     103, 103, 103, 103, 103,   1, 103,   2,   1,  24,
+       1,   5,  19,  39,  16,  13, 103,   1,  25,   1,
+      34,  34,  24, 103,  13,  12,   1,  45,  24,   7,
+     103, 103,   2, 103, 103, 103, 103, 103,
+    };
+  register int hval = len;
+
+  switch (hval)
+    {
+      default:
+      case 3:
+        hval += asso_values[str[2]];
+      case 2:
+      case 1:
+        hval += asso_values[str[0]];
+    }
+  return hval + asso_values[str[len - 1]];
+}
+
+#ifdef __GNUC__
+__inline
+#endif
+struct resword *
+is_reserved_word (str, len)
+     register char *str;
+     register unsigned int len;
+{
+  static struct resword wordlist[] =
+    {
+      {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, 
+      {"asm",  ASM, NORID},
+      {"",}, 
+      {"__asm",  ASM, NORID},
+      {"",}, 
+      {"__asm__",  ASM, NORID},
+      {"break",  BREAK, NORID},
+      {"__typeof__",  TYPEOF, NORID},
+      {"",}, 
+      {"__alignof__",  ALIGNOF, NORID},
+      {"",}, 
+      {"__attribute__",  ATTRIBUTE, NORID},
+      {"int",  TYPESPEC, RID_INT},
+      {"__attribute",  ATTRIBUTE, NORID},
+      {"__extension__",  EXTENSION, NORID},
+      {"",}, 
+      {"__signed",  TYPESPEC, RID_SIGNED},
+      {"",}, 
+      {"__signed__",  TYPESPEC, RID_SIGNED},
+      {"__inline__",  SCSPEC, RID_INLINE},
+      {"else",  ELSE, NORID},
+      {"__inline",  SCSPEC, RID_INLINE},
+      {"default",  DEFAULT, NORID},
+      {"__typeof",  TYPEOF, NORID},
+      {"while",  WHILE, NORID},
+      {"__alignof",  ALIGNOF, NORID},
+      {"struct",  STRUCT, NORID},
+      {"__const",  TYPE_QUAL, RID_CONST},
+      {"if",  IF, NORID},
+      {"__const__",  TYPE_QUAL, RID_CONST},
+      {"__label__",  LABEL, NORID},
+      {"do",  DO, NORID},
+      {"__volatile__",  TYPE_QUAL, RID_VOLATILE},
+      {"sizeof",  SIZEOF, NORID},
+      {"__volatile",  TYPE_QUAL, RID_VOLATILE},
+      {"auto",  SCSPEC, RID_AUTO},
+      {"void",  TYPESPEC, RID_VOID},
+      {"char",  TYPESPEC, RID_CHAR},
+      {"static",  SCSPEC, RID_STATIC},
+      {"case",  CASE, NORID},
+      {"extern",  SCSPEC, RID_EXTERN},
+      {"switch",  SWITCH, NORID},
+      {"for",  FOR, NORID},
+      {"inline",  SCSPEC, RID_INLINE},
+      {"typeof",  TYPEOF, NORID},
+      {"typedef",  SCSPEC, RID_TYPEDEF},
+      {"short",  TYPESPEC, RID_SHORT},
+      {"",}, 
+      {"return",  RETURN, NORID},
+      {"enum",  ENUM, NORID},
+      {"",}, 
+      {"double",  TYPESPEC, RID_DOUBLE},
+      {"signed",  TYPESPEC, RID_SIGNED},
+      {"float",  TYPESPEC, RID_FLOAT},
+      {"",}, {"",}, 
+      {"volatile",  TYPE_QUAL, RID_VOLATILE},
+      {"",}, 
+      {"const",  TYPE_QUAL, RID_CONST},
+      {"",}, 
+      {"unsigned",  TYPESPEC, RID_UNSIGNED},
+      {"",}, {"",}, {"",}, {"",}, 
+      {"continue",  CONTINUE, NORID},
+      {"",}, 
+      {"register",  SCSPEC, RID_REGISTER},
+      {"",}, {"",}, {"",}, {"",}, 
+      {"goto",  GOTO, NORID},
+      {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, 
+      {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, {"",}, 
+      
+      {"union",  UNION, NORID},
+      {"",}, {"",}, {"",}, {"",}, 
+      {"long",  TYPESPEC, RID_LONG},
+    };
+
+  if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
+    {
+      register int key = hash (str, len);
+
+      if (key <= MAX_HASH_VALUE && key >= 0)
+        {
+          register char *s = wordlist[key].name;
+
+          if (*s == *str && !strcmp (str + 1, s + 1))
+            return &wordlist[key];
+        }
+    }
+  return 0;
+}
+
+/* Return something to represent absolute declarators containing a *.
+   TARGET is the absolute declarator that the * contains.
+   TYPE_QUALS is a list of modifiers such as const or volatile
+   to apply to the pointer type, represented as identifiers.
+
+   We return an INDIRECT_REF whose "contents" are TARGET
+   and whose type is the modifier list.  */
+
+tree
+make_pointer_declarator (type_quals, target)
+     tree type_quals, target;
+{
+  return build1 (INDIRECT_REF, type_quals, target);
+}
+
+void
+init_lex ()
+{
+  /* Make identifier nodes long enough for the language-specific slots.  */
+  set_identifier_size (sizeof (struct lang_identifier));
+
+  /* Start it at 0, because check_newline is called at the very beginning
+     and will increment it to 1.  */
+  lineno = 0;
+
+#ifdef MULTIBYTE_CHARS
+  /* Change to the native locale for multibyte conversions.  */
+  setlocale (LC_CTYPE, "");
+#endif
+
+  maxtoken = 40;
+  token_buffer = (char *) xmalloc (maxtoken + 2);
+
+  ridpointers[(int) RID_INT] = get_identifier ("int");
+  ridpointers[(int) RID_CHAR] = get_identifier ("char");
+  ridpointers[(int) RID_VOID] = get_identifier ("void");
+  ridpointers[(int) RID_FLOAT] = get_identifier ("float");
+  ridpointers[(int) RID_DOUBLE] = get_identifier ("double");
+  ridpointers[(int) RID_SHORT] = get_identifier ("short");
+  ridpointers[(int) RID_LONG] = get_identifier ("long");
+  ridpointers[(int) RID_UNSIGNED] = get_identifier ("unsigned");
+  ridpointers[(int) RID_SIGNED] = get_identifier ("signed");
+  ridpointers[(int) RID_INLINE] = get_identifier ("inline");
+  ridpointers[(int) RID_CONST] = get_identifier ("const");
+  ridpointers[(int) RID_VOLATILE] = get_identifier ("volatile");
+  ridpointers[(int) RID_AUTO] = get_identifier ("auto");
+  ridpointers[(int) RID_STATIC] = get_identifier ("static");
+  ridpointers[(int) RID_EXTERN] = get_identifier ("extern");
+  ridpointers[(int) RID_TYPEDEF] = get_identifier ("typedef");
+  ridpointers[(int) RID_REGISTER] = get_identifier ("register");
+
+  /* Some options inhibit certain reserved words.
+     Clear those words out of the hash table so they won't be recognized.  */
+#define UNSET_RESERVED_WORD(STRING) \
+  do { struct resword *s = is_reserved_word (STRING, sizeof (STRING) - 1); \
+       if (s) s->name = ""; } while (0)
+
+  if (flag_traditional)
+    {
+      UNSET_RESERVED_WORD ("const");
+      UNSET_RESERVED_WORD ("volatile");
+      UNSET_RESERVED_WORD ("typeof");
+      UNSET_RESERVED_WORD ("signed");
+      UNSET_RESERVED_WORD ("inline");
+    }
+  if (flag_no_asm)
+    {
+      UNSET_RESERVED_WORD ("asm");
+      UNSET_RESERVED_WORD ("typeof");
+      UNSET_RESERVED_WORD ("inline");
+    }
+}
+
+void
+reinit_parse_for_function ()
+{
+}
+
+/* Function used when yydebug is set, to print a token in more detail.  */
+
+void
+yyprint (file, yychar, yylval)
+     FILE *file;
+     int yychar;
+     YYSTYPE yylval;
+{
+  tree t;
+  switch (yychar)
+    {
+    case IDENTIFIER:
+    case TYPENAME:
+      t = yylval.ttype;
+      if (IDENTIFIER_POINTER (t))
+	fprintf (file, " `%s'", IDENTIFIER_POINTER (t));
+      break;
+
+    case CONSTANT:
+      t = yylval.ttype;
+      if (TREE_CODE (t) == INTEGER_CST)
+	fprintf (file, " 0x%8x%8x", TREE_INT_CST_HIGH (t),
+		 TREE_INT_CST_LOW (t));
+      break;
+    }
+}
+
+
+/* If C is not whitespace, return C.
+   Otherwise skip whitespace and return first nonwhite char read.  */
+
+static int
+skip_white_space (c)
+     register int c;
+{
+#if 0
+  register int inside;
+#endif
+
+  for (;;)
+    {
+      switch (c)
+	{
+	  /* Don't recognize comments in cc1: all comments are removed by cpp,
+	     and cpp output can include / and * consecutively as operators.  */
+#if 0
+	case '/':
+	  c = getc (finput);
+	  if (c != '*')
+	    {
+	      ungetc (c, finput);
+	      return '/';
+	    }
+
+	  c = getc (finput);
+
+	  inside = 1;
+	  while (inside)
+	    {
+	      if (c == '*')
+		{
+		  while (c == '*')
+		    c = getc (finput);
+
+		  if (c == '/')
+		    {
+		      inside = 0;
+		      c = getc (finput);
+		    }
+		}
+	      else if (c == '\n')
+		{
+		  lineno++;
+		  c = getc (finput);
+		}
+	      else if (c == EOF)
+		{
+		  error ("unterminated comment");
+		  break;
+		}
+	      else
+		c = getc (finput);
+	    }
+
+	  break;
+#endif
+
+	case '\n':
+	  c = check_newline ();
+	  break;
+
+	case ' ':
+	case '\t':
+	case '\f':
+#if 0  /* ANSI says no.  */
+	case '\r':
+#endif
+	case '\v':
+	case '\b':
+	  c = getc (finput);
+	  break;
+
+	case '\\':
+	  c = getc (finput);
+	  if (c == '\n')
+	    lineno++;
+	  else
+	    error ("stray '\\' in program");
+	  c = getc (finput);
+	  break;
+
+	default:
+	  return (c);
+	}
+    }
+}
+
+/* Skips all of the white space at the current location in the input file.
+   Must use and reset nextchar if it has the next character.  */
+
+void
+position_after_white_space ()
+{
+  register int c;
+
+  if (nextchar != -1)
+    c = nextchar, nextchar = -1;
+  else
+    c = getc (finput);
+
+  ungetc (skip_white_space (c), finput);
+}
+
+/* Make the token buffer longer, preserving the data in it.
+   P should point to just beyond the last valid character in the old buffer.
+   The value we return is a pointer to the new buffer
+   at a place corresponding to P.  */
+
+static char *
+extend_token_buffer (p)
+     char *p;
+{
+  int offset = p - token_buffer;
+
+  maxtoken = maxtoken * 2 + 10;
+  token_buffer = (char *) xrealloc (token_buffer, maxtoken + 2);
+
+  return token_buffer + offset;
+}
+
+/* At the beginning of a line, increment the line number
+   and process any #-directive on this line.
+   If the line is a #-directive, read the entire line and return a newline.
+   Otherwise, return the line's first non-whitespace character.  */
+
+int
+check_newline ()
+{
+  register int c;
+  register int token;
+
+  lineno++;
+
+  /* Read first nonwhite char on the line.  */
+
+  c = getc (finput);
+  while (c == ' ' || c == '\t')
+    c = getc (finput);
+
+  if (c != '#')
+    {
+      /* If not #, return it so caller will use it.  */
+      return c;
+    }
+
+  /* Read first nonwhite char after the `#'.  */
+
+  c = getc (finput);
+  while (c == ' ' || c == '\t')
+    c = getc (finput);
+
+  /* If a letter follows, then if the word here is `line', skip
+     it and ignore it; otherwise, ignore the line, with an error
+     if the word isn't `pragma', `ident', `define', or `undef'.  */
+
+  if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
+    {
+      if (c == 'p')
+	{
+	  if (getc (finput) == 'r'
+	      && getc (finput) == 'a'
+	      && getc (finput) == 'g'
+	      && getc (finput) == 'm'
+	      && getc (finput) == 'a'
+	      && ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
+	    {
+#ifdef HANDLE_PRAGMA
+	      HANDLE_PRAGMA (finput);
+#endif /* HANDLE_PRAGMA */
+	      goto skipline;
+	    }
+	}
+
+      else if (c == 'd')
+	{
+	  if (getc (finput) == 'e'
+	      && getc (finput) == 'f'
+	      && getc (finput) == 'i'
+	      && getc (finput) == 'n'
+	      && getc (finput) == 'e'
+	      && ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
+	    {
+#ifdef DWARF_DEBUGGING_INFO
+	      if ((debug_info_level == DINFO_LEVEL_VERBOSE)
+		  && (write_symbols == DWARF_DEBUG))
+	        dwarfout_define (lineno, get_directive_line (finput));
+#endif /* DWARF_DEBUGGING_INFO */
+	      goto skipline;
+	    }
+	}
+      else if (c == 'u')
+	{
+	  if (getc (finput) == 'n'
+	      && getc (finput) == 'd'
+	      && getc (finput) == 'e'
+	      && getc (finput) == 'f'
+	      && ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
+	    {
+#ifdef DWARF_DEBUGGING_INFO
+	      if ((debug_info_level == DINFO_LEVEL_VERBOSE)
+		  && (write_symbols == DWARF_DEBUG))
+	        dwarfout_undef (lineno, get_directive_line (finput));
+#endif /* DWARF_DEBUGGING_INFO */
+	      goto skipline;
+	    }
+	}
+      else if (c == 'l')
+	{
+	  if (getc (finput) == 'i'
+	      && getc (finput) == 'n'
+	      && getc (finput) == 'e'
+	      && ((c = getc (finput)) == ' ' || c == '\t'))
+	    goto linenum;
+	}
+      else if (c == 'i')
+	{
+	  if (getc (finput) == 'd'
+	      && getc (finput) == 'e'
+	      && getc (finput) == 'n'
+	      && getc (finput) == 't'
+	      && ((c = getc (finput)) == ' ' || c == '\t'))
+	    {
+	      /* #ident.  The pedantic warning is now in cccp.c.  */
+
+	      /* Here we have just seen `#ident '.
+		 A string constant should follow.  */
+
+	      while (c == ' ' || c == '\t')
+		c = getc (finput);
+
+	      /* If no argument, ignore the line.  */
+	      if (c == '\n')
+		return c;
+
+	      ungetc (c, finput);
+	      token = yylex ();
+	      if (token != STRING
+		  || TREE_CODE (yylval.ttype) != STRING_CST)
+		{
+		  error ("invalid #ident");
+		  goto skipline;
+		}
+
+	      if (!flag_no_ident)
+		{
+#ifdef ASM_OUTPUT_IDENT
+		  ASM_OUTPUT_IDENT (asm_out_file, TREE_STRING_POINTER (yylval.ttype));
+#endif
+		}
+
+	      /* Skip the rest of this line.  */
+	      goto skipline;
+	    }
+	}
+
+      error ("undefined or invalid # directive");
+      goto skipline;
+    }
+
+linenum:
+  /* Here we have either `#line' or `# <nonletter>'.
+     In either case, it should be a line number; a digit should follow.  */
+
+  while (c == ' ' || c == '\t')
+    c = getc (finput);
+
+  /* If the # is the only nonwhite char on the line,
+     just ignore it.  Check the new newline.  */
+  if (c == '\n')
+    return c;
+
+  /* Something follows the #; read a token.  */
+
+  ungetc (c, finput);
+  token = yylex ();
+
+  if (token == CONSTANT
+      && TREE_CODE (yylval.ttype) == INTEGER_CST)
+    {
+      int old_lineno = lineno;
+      int used_up = 0;
+      /* subtract one, because it is the following line that
+	 gets the specified number */
+
+      int l = TREE_INT_CST_LOW (yylval.ttype) - 1;
+
+      /* Is this the last nonwhite stuff on the line?  */
+      c = getc (finput);
+      while (c == ' ' || c == '\t')
+	c = getc (finput);
+      if (c == '\n')
+	{
+	  /* No more: store the line number and check following line.  */
+	  lineno = l;
+	  return c;
+	}
+      ungetc (c, finput);
+
+      /* More follows: it must be a string constant (filename).  */
+
+      /* Read the string constant, but don't treat \ as special.  */
+      ignore_escape_flag = 1;
+      token = yylex ();
+      ignore_escape_flag = 0;
+
+      if (token != STRING || TREE_CODE (yylval.ttype) != STRING_CST)
+	{
+	  error ("invalid #line");
+	  goto skipline;
+	}
+
+      input_filename
+	= (char *) permalloc (TREE_STRING_LENGTH (yylval.ttype) + 1);
+      strcpy (input_filename, TREE_STRING_POINTER (yylval.ttype));
+      lineno = l;
+
+      /* Each change of file name
+	 reinitializes whether we are now in a system header.  */
+      in_system_header = 0;
+
+      if (main_input_filename == 0)
+	main_input_filename = input_filename;
+
+      /* Is this the last nonwhite stuff on the line?  */
+      c = getc (finput);
+      while (c == ' ' || c == '\t')
+	c = getc (finput);
+      if (c == '\n')
+	return c;
+      ungetc (c, finput);
+
+      token = yylex ();
+      used_up = 0;
+
+      /* `1' after file name means entering new file.
+	 `2' after file name means just left a file.  */
+
+      if (token == CONSTANT
+	  && TREE_CODE (yylval.ttype) == INTEGER_CST)
+	{
+	  if (TREE_INT_CST_LOW (yylval.ttype) == 1)
+	    {
+	      /* Pushing to a new file.  */
+	      struct file_stack *p
+		= (struct file_stack *) xmalloc (sizeof (struct file_stack));
+	      input_file_stack->line = old_lineno;
+	      p->next = input_file_stack;
+	      p->name = input_filename;
+	      input_file_stack = p;
+	      input_file_stack_tick++;
+#ifdef DWARF_DEBUGGING_INFO
+	      if (debug_info_level == DINFO_LEVEL_VERBOSE
+		  && write_symbols == DWARF_DEBUG)
+		dwarfout_start_new_source_file (input_filename);
+#endif /* DWARF_DEBUGGING_INFO */
+
+	      used_up = 1;
+	    }
+	  else if (TREE_INT_CST_LOW (yylval.ttype) == 2)
+	    {
+	      /* Popping out of a file.  */
+	      if (input_file_stack->next)
+		{
+		  struct file_stack *p = input_file_stack;
+		  input_file_stack = p->next;
+		  free (p);
+		  input_file_stack_tick++;
+#ifdef DWARF_DEBUGGING_INFO
+		  if (debug_info_level == DINFO_LEVEL_VERBOSE
+		      && write_symbols == DWARF_DEBUG)
+		    dwarfout_resume_previous_source_file (input_file_stack->line);
+#endif /* DWARF_DEBUGGING_INFO */
+		}
+	      else
+		error ("#-lines for entering and leaving files don't match");
+
+	      used_up = 1;
+	    }
+	}
+
+      /* If we have handled a `1' or a `2',
+	 see if there is another number to read.  */
+      if (used_up)
+	{
+	  /* Is this the last nonwhite stuff on the line?  */
+	  c = getc (finput);
+	  while (c == ' ' || c == '\t')
+	    c = getc (finput);
+	  if (c == '\n')
+	    return c;
+	  ungetc (c, finput);
+
+	  token = yylex ();
+	  used_up = 0;
+	}
+
+      /* `3' after file name means this is a system header file.  */
+
+      if (token == CONSTANT
+	  && TREE_CODE (yylval.ttype) == INTEGER_CST
+	  && TREE_INT_CST_LOW (yylval.ttype) == 3)
+	in_system_header = 1;
+    }
+  else
+    error ("invalid #-line");
+
+  /* skip the rest of this line.  */
+ skipline:
+  if (c == '\n')
+    return c;
+  while ((c = getc (finput)) != EOF && c != '\n');
+  return c;
+}
+
+#define isalnum(char) ((char >= 'a' && char <= 'z') || (char >= 'A' && char <= 'Z') || (char >= '0' && char <= '9'))
+#define isdigit(char) (char >= '0' && char <= '9')
+#define ENDFILE -1  /* token that represents end-of-file */
+
+/* Read an escape sequence, returning its equivalent as a character,
+   or -1 if it is backslash-newline.  */
+
+static int
+readescape ()
+{
+  register int c = getc (finput);
+  register int code;
+  register unsigned count;
+  unsigned firstdig;
+
+  switch (c)
+    {
+    case 'x':
+      if (warn_traditional)
+	warning ("the meaning of `\\x' varies with -traditional");
+
+      if (flag_traditional)
+	return c;
+
+      code = 0;
+      count = 0;
+      while (1)
+	{
+	  c = getc (finput);
+	  if (!(c >= 'a' && c <= 'f')
+	      && !(c >= 'A' && c <= 'F')
+	      && !(c >= '0' && c <= '9'))
+	    {
+	      ungetc (c, finput);
+	      break;
+	    }
+	  code *= 16;
+	  if (c >= 'a' && c <= 'f')
+	    code += c - 'a' + 10;
+	  if (c >= 'A' && c <= 'F')
+	    code += c - 'A' + 10;
+	  if (c >= '0' && c <= '9')
+	    code += c - '0';
+	  if (count == 0)
+	    firstdig = code;
+	  count++;
+	}
+      if (count == 0)
+	error ("\\x used with no following hex digits");
+      else if ((count - 1) * 4 >= TYPE_PRECISION (integer_type_node)
+	       || (count > 1
+		   && ((1 << (TYPE_PRECISION (integer_type_node) - (count - 1) * 4))
+		       <= firstdig)))
+	pedwarn ("hex escape out of range");
+      return code;
+
+    case '0':  case '1':  case '2':  case '3':  case '4':
+    case '5':  case '6':  case '7':
+      code = 0;
+      count = 0;
+      while ((c <= '7') && (c >= '0') && (count++ < 3))
+	{
+	  code = (code * 8) + (c - '0');
+	  c = getc (finput);
+	}
+      ungetc (c, finput);
+      return code;
+
+    case '\\': case '\'': case '"':
+      return c;
+
+    case '\n':
+      lineno++;
+      return -1;
+
+    case 'n':
+      return TARGET_NEWLINE;
+
+    case 't':
+      return TARGET_TAB;
+
+    case 'r':
+      return TARGET_CR;
+
+    case 'f':
+      return TARGET_FF;
+
+    case 'b':
+      return TARGET_BS;
+
+    case 'a':
+      if (warn_traditional)
+	warning ("the meaning of `\\a' varies with -traditional");
+
+      if (flag_traditional)
+	return c;
+      return TARGET_BELL;
+
+    case 'v':
+#if 0 /* Vertical tab is present in common usage compilers.  */
+      if (flag_traditional)
+	return c;
+#endif
+      return TARGET_VT;
+
+    case 'E':
+      pedwarn ("non-ANSI-standard escape sequence, `\\E'");
+      return 033;
+
+    case '?':
+      return c;
+
+      /* `\(', etc, are used at beginning of line to avoid confusing Emacs.  */
+    case '(':
+    case '{':
+    case '[':
+      if (pedantic)
+	pedwarn ("non-ANSI escape sequence `\\%c'", c);
+      return c;
+    }
+  if (c >= 040 && c <= 0177)
+    pedwarn ("unknown escape sequence `\\%c'", c);
+  else
+    pedwarn ("unknown escape sequence: `\\' followed by char code 0x%x", c);
+  return c;
+}
+
+void
+yyerror (string)
+     char *string;
+{
+  char buf[200];
+
+  strcpy (buf, string);
+
+  /* We can't print string and character constants well
+     because the token_buffer contains the result of processing escapes.  */
+  if (end_of_file)
+    strcat (buf, " at end of input");
+  else if (token_buffer[0] == 0)
+    strcat (buf, " at null character");
+  else if (token_buffer[0] == '"')
+    strcat (buf, " before string constant");
+  else if (token_buffer[0] == '\'')
+    strcat (buf, " before character constant");
+  else if (token_buffer[0] < 040 || (unsigned char) token_buffer[0] >= 0177)
+    sprintf (buf + strlen (buf), " before character 0%o",
+	     (unsigned char) token_buffer[0]);
+  else
+    strcat (buf, " before `%s'");
+
+  error (buf, token_buffer);
+}
+
+#if 0
+
+struct try_type
+{
+  tree *node_var;
+  char unsigned_flag;
+  char long_flag;
+  char long_long_flag;
+};
+
+struct try_type type_sequence[] = 
+{
+  { &integer_type_node, 0, 0, 0},
+  { &unsigned_type_node, 1, 0, 0},
+  { &long_integer_type_node, 0, 1, 0},
+  { &long_unsigned_type_node, 1, 1, 0},
+  { &long_long_integer_type_node, 0, 1, 1},
+  { &long_long_unsigned_type_node, 1, 1, 1}
+};
+#endif /* 0 */
+
+int
+yylex ()
+{
+  register int c;
+  register char *p;
+  register int value;
+  int wide_flag = 0;
+
+  if (nextchar >= 0)
+    c = nextchar, nextchar = -1;
+  else
+    c = getc (finput);
+
+  /* Effectively do c = skip_white_space (c)
+     but do it faster in the usual cases.  */
+  while (1)
+    switch (c)
+      {
+      case '\r':
+	if (!flag_traditional)	/* ANSI says no */
+	  goto found_nonwhite;
+      case ' ':
+      case '\t':
+      case '\f':
+      case '\v':
+      case '\b':
+	c = getc (finput);
+	break;
+
+      case '\n':
+      case '/':
+      case '\\':
+	c = skip_white_space (c);
+      default:
+	goto found_nonwhite;
+      }
+ found_nonwhite:
+
+  token_buffer[0] = c;
+  token_buffer[1] = 0;
+
+/*  yylloc.first_line = lineno; */
+
+  switch (c)
+    {
+    case EOF:
+      end_of_file = 1;
+      token_buffer[0] = 0;
+      value = ENDFILE;
+      break;
+
+    case '$':
+      if (dollars_in_ident)
+	goto letter;
+      return '$';
+
+    case 'L':
+      /* Capital L may start a wide-string or wide-character constant.  */
+      {
+	register int c = getc (finput);
+	if (c == '\'')
+	  {
+	    wide_flag = 1;
+	    goto char_constant;
+	  }
+	if (c == '"')
+	  {
+	    wide_flag = 1;
+	    goto string_constant;
+	  }
+	ungetc (c, finput);
+      }
+      goto letter;
+
+    case '@':
+      if (!doing_objc_thang)
+	{
+	  value = c;
+	  break;
+	}
+      p = token_buffer;
+      *p++ = '@';
+      c = getc (finput);
+      while (isalnum (c) || c == '_')
+	{
+	  if (p >= token_buffer + maxtoken)
+	    p = extend_token_buffer (p);
+
+	  *p++ = c;
+	  c = getc (finput);
+	}
+
+      *p = 0;
+      nextchar = c;
+      value = recognize_objc_keyword (token_buffer + 1);
+      if (value != 0)
+	break;
+      error ("invalid Objective C keyword `%s'", token_buffer);
+      /* Cause a syntax error--1 is not a valid token type.  */
+      value = 1;
+      break;
+
+    case 'A':  case 'B':  case 'C':  case 'D':  case 'E':
+    case 'F':  case 'G':  case 'H':  case 'I':  case 'J':
+    case 'K':		  case 'M':  case 'N':  case 'O':
+    case 'P':  case 'Q':  case 'R':  case 'S':  case 'T':
+    case 'U':  case 'V':  case 'W':  case 'X':  case 'Y':
+    case 'Z':
+    case 'a':  case 'b':  case 'c':  case 'd':  case 'e':
+    case 'f':  case 'g':  case 'h':  case 'i':  case 'j':
+    case 'k':  case 'l':  case 'm':  case 'n':  case 'o':
+    case 'p':  case 'q':  case 'r':  case 's':  case 't':
+    case 'u':  case 'v':  case 'w':  case 'x':  case 'y':
+    case 'z':
+    case '_':
+    letter:
+      p = token_buffer;
+      while (isalnum (c) || c == '_' || c == '$' || c == '@')
+	{
+	  if (p >= token_buffer + maxtoken)
+	    p = extend_token_buffer (p);
+	  if (c == '$' && ! dollars_in_ident)
+	    break;
+
+	  *p++ = c;
+	  c = getc (finput);
+	}
+
+      *p = 0;
+      nextchar = c;
+
+      value = IDENTIFIER;
+      yylval.itype = 0;
+
+      /* Try to recognize a keyword.  Uses minimum-perfect hash function */
+
+      {
+	register struct resword *ptr;
+
+	if (ptr = is_reserved_word (token_buffer, p - token_buffer))
+	  {
+	    if (ptr->rid)
+	      yylval.ttype = ridpointers[(int) ptr->rid];
+	    value = (int) ptr->token;
+
+	    /* Even if we decided to recognize asm, still perhaps warn.  */
+	    if (pedantic
+		&& (value == ASM || value == TYPEOF
+		    || ptr->rid == RID_INLINE)
+		&& token_buffer[0] != '_')
+	      pedwarn ("ANSI does not permit the keyword `%s'",
+		       token_buffer);
+	  }
+      }
+
+      /* If we did not find a keyword, look for an identifier
+	 (or a typename).  */
+
+      if (value == IDENTIFIER)
+	{
+          yylval.ttype = get_identifier (token_buffer);
+	  lastiddecl = lookup_name (yylval.ttype);
+
+	  if (lastiddecl != 0 && TREE_CODE (lastiddecl) == TYPE_DECL)
+	    value = TYPENAME;
+          else if (doing_objc_thang)
+            {
+	      tree objc_interface_decl = lookup_interface (yylval.ttype);
+
+	      if (objc_interface_decl)
+		{
+		  value = CLASSNAME;
+		  yylval.ttype = objc_interface_decl;
+		}
+	    }
+	}
+
+      break;
+
+    case '0':  case '1':  case '2':  case '3':  case '4':
+    case '5':  case '6':  case '7':  case '8':  case '9':
+    case '.':
+      {
+	int base = 10;
+	int count = 0;
+	int largest_digit = 0;
+	int numdigits = 0;
+	/* for multi-precision arithmetic,
+	   we store only 8 live bits in each short,
+	   giving us 64 bits of reliable precision */
+	short shorts[8];
+	int overflow = 0;
+
+	enum anon1 { NOT_FLOAT, AFTER_POINT, TOO_MANY_POINTS} floatflag
+	  = NOT_FLOAT;
+
+	for (count = 0; count < 8; count++)
+	  shorts[count] = 0;
+
+	p = token_buffer;
+	*p++ = c;
+
+	if (c == '0')
+	  {
+	    *p++ = (c = getc (finput));
+	    if ((c == 'x') || (c == 'X'))
+	      {
+		base = 16;
+		*p++ = (c = getc (finput));
+	      }
+	    /* Leading 0 forces octal unless the 0 is the only digit.  */
+	    else if (c >= '0' && c <= '9')
+	      {
+		base = 8;
+		numdigits++;
+	      }
+	    else
+	      numdigits++;
+	  }
+
+	/* Read all the digits-and-decimal-points.  */
+
+	while (c == '.'
+	       || (isalnum (c) && (c != 'l') && (c != 'L')
+		   && (c != 'u') && (c != 'U')
+		   && (floatflag == NOT_FLOAT || ((c != 'f') && (c != 'F')))))
+	  {
+	    if (c == '.')
+	      {
+		if (base == 16)
+		  error ("floating constant may not be in radix 16");
+		if (floatflag == AFTER_POINT)
+		  {
+		    error ("malformed floating constant");
+		    floatflag = TOO_MANY_POINTS;
+		  }
+		else
+		  floatflag = AFTER_POINT;
+
+		base = 10;
+		*p++ = c = getc (finput);
+		/* Accept '.' as the start of a floating-point number
+		   only when it is followed by a digit.
+		   Otherwise, unread the following non-digit
+		   and use the '.' as a structural token.  */
+		if (p == token_buffer + 2 && !isdigit (c))
+		  {
+		    if (c == '.')
+		      {
+			c = getc (finput);
+			if (c == '.')
+			  {
+			    *p++ = c;
+			    *p = 0;
+			    return ELLIPSIS;
+			  }
+			error ("parse error at `..'");
+		      }
+		    ungetc (c, finput);
+		    token_buffer[1] = 0;
+		    value = '.';
+		    goto done;
+		  }
+	      }
+	    else
+	      {
+		/* It is not a decimal point.
+		   It should be a digit (perhaps a hex digit).  */
+
+		if (isdigit (c))
+		  {
+		    c = c - '0';
+		  }
+		else if (base <= 10)
+		  {
+		    if ((c&~040) == 'E')
+		      {
+			base = 10;
+			floatflag = AFTER_POINT;
+			break;   /* start of exponent */
+		      }
+		    error ("nondigits in number and not hexadecimal");
+		    c = 0;
+		  }
+		else if (c >= 'a')
+		  {
+		    c = c - 'a' + 10;
+		  }
+		else
+		  {
+		    c = c - 'A' + 10;
+		  }
+		if (c >= largest_digit)
+		  largest_digit = c;
+		numdigits++;
+
+		for (count = 0; count < 8; count++)
+		  {
+		    shorts[count] *= base;
+		    if (count)
+		      {
+			shorts[count] += (shorts[count-1] >> 8);
+			shorts[count-1] &= (1<<8)-1;
+		      }
+		    else shorts[0] += c;
+		  }
+
+		if (shorts[7] >= 1<<8
+		    || shorts[7] < - (1 << 8))
+		  overflow = TRUE;
+
+		if (p >= token_buffer + maxtoken - 3)
+		  p = extend_token_buffer (p);
+		*p++ = (c = getc (finput));
+	      }
+	  }
+
+	if (numdigits == 0)
+	  error ("numeric constant with no digits");
+
+	if (largest_digit >= base)
+	  error ("numeric constant contains digits beyond the radix");
+
+	/* Remove terminating char from the token buffer and delimit the string */
+	*--p = 0;
+
+	if (floatflag != NOT_FLOAT)
+	  {
+	    tree type = double_type_node;
+	    char f_seen = 0;
+	    char l_seen = 0;
+	    REAL_VALUE_TYPE value;
+	    jmp_buf handler;
+
+	    /* Read explicit exponent if any, and put it in tokenbuf.  */
+
+	    if ((c == 'e') || (c == 'E'))
+	      {
+		if (p >= token_buffer + maxtoken - 3)
+		  p = extend_token_buffer (p);
+		*p++ = c;
+		c = getc (finput);
+		if ((c == '+') || (c == '-'))
+		  {
+		    *p++ = c;
+		    c = getc (finput);
+		  }
+		if (! isdigit (c))
+		  error ("floating constant exponent has no digits");
+	        while (isdigit (c))
+		  {
+		    if (p >= token_buffer + maxtoken - 3)
+		      p = extend_token_buffer (p);
+		    *p++ = c;
+		    c = getc (finput);
+		  }
+	      }
+
+	    *p = 0;
+	    errno = 0;
+
+	    /* Convert string to a double, checking for overflow.  */
+	    if (setjmp (handler))
+	      {
+		error ("floating constant out of range");
+		value = dconst0;
+	      }
+	    else
+	      {
+		set_float_handler (handler);
+		value = REAL_VALUE_ATOF (token_buffer);
+		set_float_handler (0);
+	      }
+#ifdef ERANGE
+	    if (errno == ERANGE && !flag_traditional)
+	      {
+		char *p1 = token_buffer;
+		/* Check for "0.0" and variants;
+		   Sunos 4 spuriously returns ERANGE for them.  */
+		while (*p1 == '0') p1++;
+		if (*p1 == '.')
+		  {
+		    p1++;
+		    while (*p1 == '0') p1++;
+		  }
+		if (*p1 == 'e' || *p1 == 'E')
+		  {
+		    /* with significand==0, ignore the exponent */
+		    p1++;
+		    while (*p1 != 0) p1++;
+		  }
+		/* ERANGE is also reported for underflow,
+		   so test the value to distinguish overflow from that.  */
+		if (*p1 != 0 && (value > 1.0 || value < -1.0))
+		  warning ("floating point number exceeds range of `double'");
+	      }
+#endif
+
+	    /* Read the suffixes to choose a data type.  */
+	    while (1)
+	      {
+		if (c == 'f' || c == 'F')
+		  {
+		    if (f_seen)
+		      error ("two `f's in floating constant");
+		    f_seen = 1;
+		    type = float_type_node;
+		    value = REAL_VALUE_TRUNCATE (TYPE_MODE (type), value);
+		  }
+		else if (c == 'l' || c == 'L')
+		  {
+		    if (l_seen)
+		      error ("two `l's in floating constant");
+		    l_seen = 1;
+		    type = long_double_type_node;
+		  }
+		else
+		  {
+		    if (isalnum (c))
+		      {
+			error ("garbage at end of number");
+			while (isalnum (c))
+			  {
+			    if (p >= token_buffer + maxtoken - 3)
+			      p = extend_token_buffer (p);
+			    *p++ = c;
+			    c = getc (finput);
+			  }
+		      }
+		    break;
+		  }
+		if (p >= token_buffer + maxtoken - 3)
+		  p = extend_token_buffer (p);
+		*p++ = c;
+		c = getc (finput);
+	      }
+
+	    /* Create a node with determined type and value.  */
+	    yylval.ttype = build_real (type, value);
+
+	    ungetc (c, finput);
+	    *p = 0;
+	  }
+	else
+	  {
+	    tree traditional_type, ansi_type, type;
+	    int spec_unsigned = 0;
+	    int spec_long = 0;
+	    int spec_long_long = 0;
+	    int bytes, warn, i;
+
+	    while (1)
+	      {
+		if (c == 'u' || c == 'U')
+		  {
+		    if (spec_unsigned)
+		      error ("two `u's in integer constant");
+		    spec_unsigned = 1;
+		  }
+		else if (c == 'l' || c == 'L')
+		  {
+		    if (spec_long)
+		      {
+			if (spec_long_long)
+			  error ("three `l's in integer constant");
+			else if (pedantic)
+			  pedwarn ("ANSI C forbids long long integer constants");
+			spec_long_long = 1;
+		      }
+		    spec_long = 1;
+		  }
+		else
+		  {
+		    if (isalnum (c))
+		      {
+			error ("garbage at end of number");
+			while (isalnum (c))
+			  {
+			    if (p >= token_buffer + maxtoken - 3)
+			      p = extend_token_buffer (p);
+			    *p++ = c;
+			    c = getc (finput);
+			  }
+		      }
+		    break;
+		  }
+		if (p >= token_buffer + maxtoken - 3)
+		  p = extend_token_buffer (p);
+		*p++ = c;
+		c = getc (finput);
+	      }
+
+	    ungetc (c, finput);
+
+	    /* If the constant is not long long and it won't fit in an
+	       unsigned long, or if the constant is long long and won't fit
+	       in an unsigned long long, then warn that the constant is out
+	       of range.  */
+
+	    /* ??? This assumes that long long and long integer types are
+	       a multiple of 8 bits.  This better than the original code
+	       though which assumed that long was exactly 32 bits and long
+	       long was exactly 64 bits.  */
+
+	    if (spec_long_long)
+	      bytes = TYPE_PRECISION (long_long_integer_type_node) / 8;
+	    else
+	      bytes = TYPE_PRECISION (long_integer_type_node) / 8;
+
+	    if (bytes <= 8)
+	      {
+		warn = overflow;
+		for (i = bytes; i < 8; i++)
+		  if (shorts[i])
+		    {
+		      /* If LL was not used, then clear any excess precision.
+			 This is equivalent to the original code, but it is
+			 not clear why this is being done.  Perhaps to prevent
+			 ANSI programs from creating long long constants
+			 by accident?  */
+		      if (! spec_long_long)
+			shorts[i] = 0;
+		      warn = 1;
+		    }
+		if (warn)
+		  warning ("integer constant out of range");
+	      }
+	    else if (overflow)
+	      warning ("integer constant larger than compiler can handle");
+
+	    /* If it overflowed our internal buffer, then make it unsigned.
+	       We can't distinguish based on the tree node because
+	       any integer constant fits any long long type.  */
+	    if (overflow)
+	      spec_unsigned = 1;
+
+	    /* This is simplified by the fact that our constant
+	       is always positive.  */
+	    /* The casts in the following statement should not be
+	       needed, but they get around bugs in some C compilers.  */
+	    yylval.ttype
+	      = (build_int_2
+		 ((((long)shorts[3]<<24) + ((long)shorts[2]<<16)
+		   + ((long)shorts[1]<<8) + (long)shorts[0]),
+		  (((long)shorts[7]<<24) + ((long)shorts[6]<<16)
+		   + ((long)shorts[5]<<8) + (long)shorts[4])));
+
+#if 0
+	    /* Find the first allowable type that the value fits in.  */
+	    type = 0;
+	    for (i = 0; i < sizeof (type_sequence) / sizeof (type_sequence[0]);
+		 i++)
+	      if (!(spec_long && !type_sequence[i].long_flag)
+		  && !(spec_long_long && !type_sequence[i].long_long_flag)
+		  && !(spec_unsigned && !type_sequence[i].unsigned_flag)
+		  /* A decimal constant can't be unsigned int
+		     unless explicitly specified.  */
+		  && !(base == 10 && !spec_unsigned
+		       && *type_sequence[i].node_var == unsigned_type_node))
+		if (int_fits_type_p (yylval.ttype, *type_sequence[i].node_var))
+		  {
+		    type = *type_sequence[i].node_var;
+		    break;
+		  }
+	    if (flag_traditional && type == long_unsigned_type_node
+		&& !spec_unsigned)
+	      type = long_integer_type_node;
+	      
+	    if (type == 0)
+	      {
+		type = long_long_integer_type_node;
+		warning ("integer constant out of range");
+	      }
+
+	    /* Warn about some cases where the type of a given constant
+	       changes from traditional C to ANSI C.  */
+	    if (warn_traditional)
+	      {
+		tree other_type = 0;
+
+		/* This computation is the same as the previous one
+		   except that flag_traditional is used backwards.  */
+		for (i = 0; i < sizeof (type_sequence) / sizeof (type_sequence[0]);
+		     i++)
+		  if (!(spec_long && !type_sequence[i].long_flag)
+		      && !(spec_long_long && !type_sequence[i].long_long_flag)
+		      && !(spec_unsigned && !type_sequence[i].unsigned_flag)
+		      /* A decimal constant can't be unsigned int
+			 unless explicitly specified.  */
+		      && !(base == 10 && !spec_unsigned
+			   && *type_sequence[i].node_var == unsigned_type_node))
+		    if (int_fits_type_p (yylval.ttype, *type_sequence[i].node_var))
+		      {
+			other_type = *type_sequence[i].node_var;
+			break;
+		      }
+		if (!flag_traditional && type == long_unsigned_type_node
+		    && !spec_unsigned)
+		  type = long_integer_type_node;
+	      
+		if (other_type != 0 && other_type != type)
+		  {
+		    if (flag_traditional)
+		      warning ("type of integer constant would be different without -traditional");
+		    else
+		      warning ("type of integer constant would be different with -traditional");
+		  }
+	      }
+
+#else /* 1 */
+	    /* If warn_traditional, calculate both the ANSI type and the
+	       traditional type, then see if they disagree.
+	       Otherwise, calculate only the type for the dialect in use.  */
+	    if (warn_traditional || flag_traditional)
+	      {
+		/* Calculate the traditional type.  */
+		/* Traditionally, any constant is signed;
+		   but if unsigned is specified explicitly, obey that.
+		   Use the smallest size with the right number of bits,
+		   except for one special case with decimal constants.  */
+		if (! spec_long && base != 10
+		    && int_fits_type_p (yylval.ttype, unsigned_type_node))
+		  traditional_type = (spec_unsigned ? unsigned_type_node
+				      : integer_type_node);
+		/* A decimal constant must be long
+		   if it does not fit in type int.
+		   I think this is independent of whether
+		   the constant is signed.  */
+		else if (! spec_long && base == 10
+			 && int_fits_type_p (yylval.ttype, integer_type_node))
+		  traditional_type = (spec_unsigned ? unsigned_type_node
+				      : integer_type_node);
+		else if (! spec_long_long
+			 && int_fits_type_p (yylval.ttype,
+					     long_unsigned_type_node))
+		  traditional_type = (spec_unsigned ? long_unsigned_type_node
+				      : long_integer_type_node);
+		else
+		  traditional_type = (spec_unsigned
+				      ? long_long_unsigned_type_node
+				      : long_long_integer_type_node);
+	      }
+	    if (warn_traditional || ! flag_traditional)
+	      {
+		/* Calculate the ANSI type.  */
+		if (! spec_long && ! spec_unsigned
+		    && int_fits_type_p (yylval.ttype, integer_type_node))
+		  ansi_type = integer_type_node;
+		else if (! spec_long && (base != 10 || spec_unsigned)
+			 && int_fits_type_p (yylval.ttype, unsigned_type_node))
+		  ansi_type = unsigned_type_node;
+		else if (! spec_unsigned && !spec_long_long
+			 && int_fits_type_p (yylval.ttype, long_integer_type_node))
+		  ansi_type = long_integer_type_node;
+		else if (! spec_long_long
+			 && int_fits_type_p (yylval.ttype,
+					     long_unsigned_type_node))
+		  ansi_type = long_unsigned_type_node;
+		else if (! spec_unsigned
+			 && int_fits_type_p (yylval.ttype,
+					     long_long_integer_type_node))
+		  ansi_type = long_long_integer_type_node;
+		else
+		  ansi_type = long_long_unsigned_type_node;
+	      }
+
+	    type = flag_traditional ? traditional_type : ansi_type;
+
+	    if (warn_traditional && traditional_type != ansi_type)
+	      {
+		if (TYPE_PRECISION (traditional_type)
+		    != TYPE_PRECISION (ansi_type))
+		  warning ("width of integer constant changes with -traditional");
+		else if (TREE_UNSIGNED (traditional_type)
+			 != TREE_UNSIGNED (ansi_type))
+		  warning ("integer constant is unsigned in ANSI C, signed with -traditional");
+		else abort ();
+	      }
+#endif
+
+	    TREE_TYPE (yylval.ttype) = type;
+	    *p = 0;
+	  }
+
+	value = CONSTANT; break;
+      }
+
+    case '\'':
+    char_constant:
+      {
+	register int result = 0;
+	register num_chars = 0;
+	unsigned width = TYPE_PRECISION (char_type_node);
+	int max_chars;
+
+	if (wide_flag)
+	  {
+	    width = WCHAR_TYPE_SIZE;
+#ifdef MULTIBYTE_CHARS
+	    max_chars = MB_CUR_MAX;
+#else
+	    max_chars = 1;
+#endif
+	  }
+	else
+	  max_chars = TYPE_PRECISION (integer_type_node) / width;
+
+	while (1)
+	  {
+	  tryagain:
+
+	    c = getc (finput);
+
+	    if (c == '\'' || c == EOF)
+	      break;
+
+	    if (c == '\\')
+	      {
+		c = readescape ();
+		if (c < 0)
+		  goto tryagain;
+		if (width < HOST_BITS_PER_INT
+		    && (unsigned) c >= (1 << width))
+		  pedwarn ("escape sequence out of range for character");
+	      }
+	    else if (c == '\n')
+	      {
+		if (pedantic)
+		  pedwarn ("ANSI C forbids newline in character constant");
+		lineno++;
+	      }
+
+	    num_chars++;
+	    if (num_chars > maxtoken - 4)
+	      extend_token_buffer (token_buffer);
+
+	    token_buffer[num_chars] = c;
+
+	    /* Merge character into result; ignore excess chars.  */
+	    if (num_chars < max_chars + 1)
+	      {
+		if (width < HOST_BITS_PER_INT)
+		  result = (result << width) | (c & ((1 << width) - 1));
+		else
+		  result = c;
+	      }
+	  }
+
+	token_buffer[num_chars + 1] = '\'';
+	token_buffer[num_chars + 2] = 0;
+
+	if (c != '\'')
+	  error ("malformatted character constant");
+	else if (num_chars == 0)
+	  error ("empty character constant");
+	else if (num_chars > max_chars)
+	  {
+	    num_chars = max_chars;
+	    error ("character constant too long");
+	  }
+	else if (num_chars != 1 && ! flag_traditional)
+	  warning ("multi-character character constant");
+
+	/* If char type is signed, sign-extend the constant.  */
+	if (! wide_flag)
+	  {
+	    int num_bits = num_chars * width;
+	    if (TREE_UNSIGNED (char_type_node)
+		|| ((result >> (num_bits - 1)) & 1) == 0)
+	      yylval.ttype
+		= build_int_2 (result & ((unsigned) ~0
+					 >> (HOST_BITS_PER_INT - num_bits)),
+			       0);
+	    else
+	      yylval.ttype
+		= build_int_2 (result | ~((unsigned) ~0
+					  >> (HOST_BITS_PER_INT - num_bits)),
+			       -1);
+	  }
+	else
+	  {
+#ifdef MULTIBYTE_CHARS
+	    /* Set the initial shift state and convert the next sequence.  */
+	    result = 0;
+	    /* In all locales L'\0' is zero and mbtowc will return zero,
+	       so don't use it.  */
+	    if (num_chars > 1
+		|| (num_chars == 1 && token_buffer[1] != '\0'))
+	      {
+		wchar_t wc;
+		(void) mbtowc (NULL, NULL, 0);
+		if (mbtowc (& wc, token_buffer + 1, num_chars) == num_chars)
+		  result = wc;
+		else
+		  warning ("Ignoring invalid multibyte character");
+	      }
+#endif
+	    yylval.ttype = build_int_2 (result, 0);
+	  }
+
+	TREE_TYPE (yylval.ttype) = integer_type_node;
+	value = CONSTANT;
+	break;
+      }
+
+    case '"':
+    string_constant:
+      {
+	c = getc (finput);
+	p = token_buffer + 1;
+
+	while (c != '"' && c >= 0)
+	  {
+	    /* ignore_escape_flag is set for reading the filename in #line.  */
+	    if (!ignore_escape_flag && c == '\\')
+	      {
+		c = readescape ();
+		if (c < 0)
+		  goto skipnewline;
+		if (!wide_flag
+		    && TYPE_PRECISION (char_type_node) < HOST_BITS_PER_INT
+		    && c >= (1 << TYPE_PRECISION (char_type_node)))
+		  pedwarn ("escape sequence out of range for character");
+	      }
+	    else if (c == '\n')
+	      {
+		if (pedantic)
+		  pedwarn ("ANSI C forbids newline in string constant");
+		lineno++;
+	      }
+
+	    if (p == token_buffer + maxtoken)
+	      p = extend_token_buffer (p);
+	    *p++ = c;
+
+	  skipnewline:
+	    c = getc (finput);
+	  }
+	*p = 0;
+
+	/* We have read the entire constant.
+	   Construct a STRING_CST for the result.  */
+
+	if (wide_flag)
+	  {
+	    /* If this is a L"..." wide-string, convert the multibyte string
+	       to a wide character string.  */
+	    char *widep = (char *) alloca ((p - token_buffer) * WCHAR_BYTES);
+	    int len;
+
+#ifdef MULTIBYTE_CHARS
+	    len = mbstowcs ((wchar_t *) widep, token_buffer + 1, p - token_buffer);
+	    if ((unsigned) len >= (p - token_buffer))
+	      {
+		warning ("Ignoring invalid multibyte string");
+		len = 0;
+	      }
+	    bzero (widep + (len * WCHAR_BYTES), WCHAR_BYTES);
+#else
+	    {
+	      union { long l; char c[sizeof (long)]; } u;
+	      int big_endian;
+	      char *wp, *cp;
+
+	      /* Determine whether host is little or big endian.  */
+	      u.l = 1;
+	      big_endian = u.c[sizeof (long) - 1];
+	      wp = widep + (big_endian ? WCHAR_BYTES - 1 : 0);
+
+	      bzero (widep, (p - token_buffer) * WCHAR_BYTES);
+	      for (cp = token_buffer + 1; cp < p; cp++)
+		*wp = *cp, wp += WCHAR_BYTES;
+	      len = p - token_buffer - 1;
+	    }
+#endif
+	    yylval.ttype = build_string ((len + 1) * WCHAR_BYTES, widep);
+	    TREE_TYPE (yylval.ttype) = wchar_array_type_node;
+	  }
+	else
+	  {
+	    yylval.ttype = build_string (p - token_buffer, token_buffer + 1);
+	    TREE_TYPE (yylval.ttype) = char_array_type_node;
+	  }
+
+	*p++ = '"';
+	*p = 0;
+
+	value = STRING; break;
+      }
+
+    case '+':
+    case '-':
+    case '&':
+    case '|':
+    case '<':
+    case '>':
+    case '*':
+    case '/':
+    case '%':
+    case '^':
+    case '!':
+    case '=':
+      {
+	register int c1;
+
+      combine:
+
+	switch (c)
+	  {
+	  case '+':
+	    yylval.code = PLUS_EXPR; break;
+	  case '-':
+	    yylval.code = MINUS_EXPR; break;
+	  case '&':
+	    yylval.code = BIT_AND_EXPR; break;
+	  case '|':
+	    yylval.code = BIT_IOR_EXPR; break;
+	  case '*':
+	    yylval.code = MULT_EXPR; break;
+	  case '/':
+	    yylval.code = TRUNC_DIV_EXPR; break;
+	  case '%':
+	    yylval.code = TRUNC_MOD_EXPR; break;
+	  case '^':
+	    yylval.code = BIT_XOR_EXPR; break;
+	  case LSHIFT:
+	    yylval.code = LSHIFT_EXPR; break;
+	  case RSHIFT:
+	    yylval.code = RSHIFT_EXPR; break;
+	  case '<':
+	    yylval.code = LT_EXPR; break;
+	  case '>':
+	    yylval.code = GT_EXPR; break;
+	  }
+
+	token_buffer[1] = c1 = getc (finput);
+	token_buffer[2] = 0;
+
+	if (c1 == '=')
+	  {
+	    switch (c)
+	      {
+	      case '<':
+		value = ARITHCOMPARE; yylval.code = LE_EXPR; goto done;
+	      case '>':
+		value = ARITHCOMPARE; yylval.code = GE_EXPR; goto done;
+	      case '!':
+		value = EQCOMPARE; yylval.code = NE_EXPR; goto done;
+	      case '=':
+		value = EQCOMPARE; yylval.code = EQ_EXPR; goto done;
+	      }
+	    value = ASSIGN; goto done;
+	  }
+	else if (c == c1)
+	  switch (c)
+	    {
+	    case '+':
+	      value = PLUSPLUS; goto done;
+	    case '-':
+	      value = MINUSMINUS; goto done;
+	    case '&':
+	      value = ANDAND; goto done;
+	    case '|':
+	      value = OROR; goto done;
+	    case '<':
+	      c = LSHIFT;
+	      goto combine;
+	    case '>':
+	      c = RSHIFT;
+	      goto combine;
+	    }
+	else if ((c == '-') && (c1 == '>'))
+	  { value = POINTSAT; goto done; }
+	ungetc (c1, finput);
+	token_buffer[1] = 0;
+
+	if ((c == '<') || (c == '>'))
+	  value = ARITHCOMPARE;
+	else value = c;
+	goto done;
+      }
+
+    case 0:
+      /* Don't make yyparse think this is eof.  */
+      value = 1;
+      break;
+
+    default:
+      value = c;
+    }
+
+done:
+/*  yylloc.last_line = lineno; */
+
+  return value;
+}
+
+/* Sets the value of the 'yydebug' varable to VALUE.
+   This is a function so we don't have to have YYDEBUG defined
+   in order to build the compiler.  */
+
+void
+set_yydebug (value)
+     int value;
+{
+#if YYDEBUG != 0
+  yydebug = value;
+#else
+  warning ("YYDEBUG not defined.");
+#endif
+}