vendor/gcc/cvs-20000711-1732

1 files changed, 0 insertions, 1058 deletions

diff --git a/contrib/gcc/cppexp.c b/contrib/gcc/cppexp.c
deleted file mode 100644
index aef6d195dc63..000000000000
--- a/contrib/gcc/cppexp.c
+++ /dev/null
@@ -1,1058 +0,0 @@
-/* Parse C expressions for CCCP.
-   Copyright (C) 1987, 92, 94, 95, 97, 98, 1999 Free Software Foundation.
-
-This program is free software; you can redistribute it and/or modify it
-under the terms of the GNU General Public License as published by the
-Free Software Foundation; either version 2, or (at your option) any
-later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.
-
- In other words, you are welcome to use, share and improve this program.
- You are forbidden to forbid anyone else to use, share and improve
- what you give them.   Help stamp out software-hoarding!
-
-Written by Per Bothner 1994.  */
-
-/* Parse a C expression from text in a string  */
-   
-#include "config.h"
-#include "system.h"
-#include "cpplib.h"
-
-#ifdef MULTIBYTE_CHARS
-#include <locale.h>
-#endif
-
-#ifndef CHAR_TYPE_SIZE
-#define CHAR_TYPE_SIZE BITS_PER_UNIT
-#endif
-
-#ifndef INT_TYPE_SIZE
-#define INT_TYPE_SIZE BITS_PER_WORD
-#endif
-
-#ifndef LONG_TYPE_SIZE
-#define LONG_TYPE_SIZE BITS_PER_WORD
-#endif
-
-#ifndef WCHAR_TYPE_SIZE
-#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
-#endif
-
-#ifndef MAX_CHAR_TYPE_SIZE
-#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
-#endif
-
-#ifndef MAX_INT_TYPE_SIZE
-#define MAX_INT_TYPE_SIZE INT_TYPE_SIZE
-#endif
-
-#ifndef MAX_LONG_TYPE_SIZE
-#define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE
-#endif
-
-#ifndef MAX_WCHAR_TYPE_SIZE
-#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
-#endif
-
-#define MAX_CHAR_TYPE_MASK (MAX_CHAR_TYPE_SIZE < HOST_BITS_PER_WIDEST_INT \
-			    ? (~ (~ (HOST_WIDEST_INT) 0 << MAX_CHAR_TYPE_SIZE)) \
-			    : ~ (HOST_WIDEST_INT) 0)
-
-#define MAX_WCHAR_TYPE_MASK (MAX_WCHAR_TYPE_SIZE < HOST_BITS_PER_WIDEST_INT \
-			     ? ~ (~ (HOST_WIDEST_INT) 0 << MAX_WCHAR_TYPE_SIZE) \
-			     : ~ (HOST_WIDEST_INT) 0)
-
-/* Yield nonzero if adding two numbers with A's and B's signs can yield a
-   number with SUM's sign, where A, B, and SUM are all C integers.  */
-#define possible_sum_sign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0)
-
-static void integer_overflow PARAMS ((cpp_reader *));
-static HOST_WIDEST_INT left_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT, int, unsigned HOST_WIDEST_INT));
-static HOST_WIDEST_INT right_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT, int, unsigned HOST_WIDEST_INT));
-
-#define ERROR 299
-#define OROR 300
-#define ANDAND 301
-#define EQUAL 302
-#define NOTEQUAL 303
-#define LEQ 304
-#define GEQ 305
-#define LSH 306
-#define RSH 307
-#define NAME 308
-#define INT 309
-#define CHAR 310
-
-#define LEFT_OPERAND_REQUIRED 1
-#define RIGHT_OPERAND_REQUIRED 2
-#define HAVE_VALUE 4
-/* SKIP_OPERAND is set for '&&' '||' '?' and ':' when the
-   following operand should be short-circuited instead of evaluated.  */
-#define SKIP_OPERAND 8
-/*#define UNSIGNEDP 16*/
-
-struct operation {
-    short op;
-    char rprio; /* Priority of op (relative to it right operand).  */
-    char flags;
-    char unsignedp;    /* true if value should be treated as unsigned */
-    HOST_WIDEST_INT value;        /* The value logically "right" of op.  */
-};
-
-/* Parse and convert an integer for #if.  Accepts decimal, hex, or octal
-   with or without size suffixes.  */
-
-static struct operation
-parse_number (pfile, start, end)
-     cpp_reader *pfile;
-     U_CHAR *start;
-     U_CHAR *end;
-{
-  struct operation op;
-  U_CHAR *p = start;
-  int c;
-  unsigned HOST_WIDEST_INT n = 0, nd, MAX_over_base;
-  int base = 10;
-  int overflow = 0;
-  int digit, largest_digit = 0;
-  int spec_long = 0;
-
-  op.unsignedp = 0;
-
-  if (p[0] == '0')
-    {
-      if (end - start >= 3 && (p[1] == 'x' || p[1] == 'X'))
-	{
-	  p += 2;
-	  base = 16;
-	}
-      else
-	{
-	  p += 1;
-	  base = 8;
-	}
-    }
-
-  /* Some buggy compilers (e.g. MPW C) seem to need both casts.  */
-  MAX_over_base = (((unsigned HOST_WIDEST_INT) -1)
-		   / ((unsigned HOST_WIDEST_INT) base));
-
-  while (p < end)
-    {
-      c = *p++;
-
-      if (c >= '0' && c <= '9')
-	digit = c - '0';
-      else if (base == 16 && c >= 'a' && c <= 'f') /* FIXME: assumes ASCII */
-	digit = c - 'a' + 10;
-      else if (base == 16 && c >= 'A' && c <= 'F')
-	digit = c - 'A' + 10;
-      else if (c == '.')
-	{
-	  /* It's a float since it contains a point.  */
-	  cpp_error (pfile,
-		"floating point numbers are not allowed in #if expressions");
-	  goto error;
-	}
-      else
-	{
-	  /* `l' means long, and `u' means unsigned.  */
-	  for (;;)
-	    {
-	      if (c == 'l' || c == 'L')
-		  spec_long++;
-	      else if (c == 'u' || c == 'U')
-		  op.unsignedp++;
-	      else
-		{
-		  /* Decrement p here so that the error for an invalid number
-		     will be generated below in the case where this is the
-		     last character in the buffer.  */
-		  p--;
-		  break;
-		}
-	      if (p == end)
-		break;
-	      c = *p++;
-	    }
-	  /* Don't look for any more digits after the suffixes.  */
-	  break;
-	}
-      
-      if (largest_digit < digit)
-	largest_digit = digit;
-      nd = n * base + digit;
-      overflow |= MAX_over_base < n || nd < n;
-      n = nd;
-    }
-
-  if (p != end)
-    {
-      cpp_error (pfile, "invalid number in #if expression");
-      goto error;
-    }
-  else if (spec_long > (CPP_OPTIONS (pfile)->c89 ? 1 : 2))
-    {
-      cpp_error (pfile, "too many `l' suffixes in integer constant");
-      goto error;
-    }
-  else if (op.unsignedp > 1)
-    {
-      cpp_error (pfile, "too many `u' suffixes in integer constant");
-      goto error;
-    }
-  
-  if (base <= largest_digit)
-    cpp_pedwarn (pfile, "integer constant contains digits beyond the radix");
-
-  if (overflow)
-    cpp_pedwarn (pfile, "integer constant out of range");
-
-  /* If too big to be signed, consider it unsigned.  */
-  else if ((HOST_WIDEST_INT) n < 0 && ! op.unsignedp)
-    {
-      if (base == 10)
-	cpp_warning (pfile,
-		     "integer constant is so large that it is unsigned");
-      op.unsignedp = 1;
-    }
-
-  op.value = n;
-  op.op = INT;
-  return op;
-
- error:
-  op.op = ERROR;
-  return op;
-}
-
-/* Parse and convert a character constant for #if.  Understands backslash
-   escapes (\n, \031) and multibyte characters (if so configured).  */
-static struct operation
-parse_charconst (pfile, start, end)
-     cpp_reader *pfile;
-     U_CHAR *start;
-     U_CHAR *end;
-{
-  struct operation op;
-  HOST_WIDEST_INT result = 0;
-  int num_chars = 0;
-  int num_bits;
-  unsigned int width = MAX_CHAR_TYPE_SIZE, mask = MAX_CHAR_TYPE_MASK;
-  int max_chars;
-  U_CHAR *ptr = start;
-
-  /* FIXME: Should use reentrant multibyte functions.  */
-#ifdef MULTIBYTE_CHARS
-  wchar_t c = (wchar_t)-1;
-  (void) mbtowc (NULL_PTR, NULL_PTR, 0);
-#else
-  int c = -1;
-#endif
-
-  if (*ptr == 'L')
-    {
-      ++ptr;
-      width = MAX_WCHAR_TYPE_SIZE, mask = MAX_WCHAR_TYPE_MASK;
-    }
-  max_chars = MAX_LONG_TYPE_SIZE / width;
-
-  ++ptr;  /* skip initial quote */
-
-  while (ptr < end)
-    {
-#ifndef MULTIBYTE_CHARS
-      c = *ptr++;
-#else
-      ptr += mbtowc (&c, ptr, end - ptr);
-#endif
-      if (c == '\'' || c == '\0')
-	break;
-      else if (c == '\\')
-	{
-	  /* Hopefully valid assumption: if mbtowc returns a backslash,
-	     we are in initial shift state.  No valid escape-sequence
-	     character can take us out of initial shift state or begin
-	     an unshifted multibyte char, so cpp_parse_escape doesn't
-	     need to know about multibyte chars.  */
-
-	  c = cpp_parse_escape (pfile, (char **) &ptr, mask);
-	  if (width < HOST_BITS_PER_INT
-	      && (unsigned int) c >= (unsigned int)(1 << width))
-	    cpp_pedwarn (pfile, "escape sequence out of range for character");
-	}
-	  
-      /* Merge character into result; ignore excess chars.  */
-      if (++num_chars <= max_chars)
-	{
-	  if (width < HOST_BITS_PER_INT)
-	    result = (result << width) | (c & ((1 << width) - 1));
-	  else
-	    result = c;
-	}
-    }
-
-  if (num_chars == 0)
-    {
-      cpp_error (pfile, "empty character constant");
-      goto error;
-    }
-  else if (c != '\'')
-    {
-      /* cpp_get_token has already emitted an error if !traditional. */
-      if (! CPP_TRADITIONAL (pfile))
-	cpp_error (pfile, "malformatted character constant");
-      goto error;
-    }
-  else if (num_chars > max_chars)
-    {
-      cpp_error (pfile, "character constant too long");
-      goto error;
-    }
-  else if (num_chars != 1 && ! CPP_TRADITIONAL (pfile))
-    cpp_warning (pfile, "multi-character character constant");
-
-  /* If char type is signed, sign-extend the constant.  */
-  num_bits = num_chars * width;
-      
-  if (cpp_lookup (pfile, (U_CHAR *)"__CHAR_UNSIGNED__",
-		  sizeof ("__CHAR_UNSIGNED__")-1, -1)
-      || ((result >> (num_bits - 1)) & 1) == 0)
-    op.value = result & ((unsigned HOST_WIDEST_INT) ~0
-			 >> (HOST_BITS_PER_WIDEST_INT - num_bits));
-  else
-    op.value = result | ~((unsigned HOST_WIDEST_INT) ~0
-			  >> (HOST_BITS_PER_WIDEST_INT - num_bits));
-
-  /* This is always a signed type.  */
-  op.unsignedp = 0;
-  op.op = CHAR;
-  return op;
-
- error:
-  op.op = ERROR;
-  return op;
-}
-
-
-struct token {
-  char *operator;
-  int token;
-};
-
-static struct token tokentab2[] = {
-  {"&&", ANDAND},
-  {"||", OROR},
-  {"<<", LSH},
-  {">>", RSH},
-  {"==", EQUAL},
-  {"!=", NOTEQUAL},
-  {"<=", LEQ},
-  {">=", GEQ},
-  {"++", ERROR},
-  {"--", ERROR},
-  {NULL, ERROR}
-};
-
-/* Read one token.  */
-
-static struct operation
-cpp_lex (pfile, skip_evaluation)
-     cpp_reader *pfile;
-     int skip_evaluation;
-{
-  U_CHAR c;
-  struct token *toktab;
-  enum cpp_token token;
-  struct operation op;
-  U_CHAR *tok_start, *tok_end;
-  int old_written;
-
- retry:
-
-  old_written = CPP_WRITTEN (pfile);
-  cpp_skip_hspace (pfile);
-  c = CPP_BUF_PEEK (CPP_BUFFER (pfile));
-  if (c == '#')
-    {
-      op.op = INT;
-      op.value = cpp_read_check_assertion (pfile);
-      return op;
-    }
-
-  if (c == '\n')
-    {
-      op.op = 0;
-      return op;
-    }
-
-  token = cpp_get_token (pfile);
-  tok_start = pfile->token_buffer + old_written;
-  tok_end = CPP_PWRITTEN (pfile);
-  pfile->limit = tok_start;
-  switch (token)
-  {
-    case CPP_EOF: /* Should not happen ...  */
-    case CPP_VSPACE:
-      op.op = 0;
-      return op;
-    case CPP_POP:
-      if (CPP_BUFFER (pfile)->fname != NULL)
-	{
-	  op.op = 0;
-	  return op;
-	}
-      cpp_pop_buffer (pfile);
-      goto retry;
-    case CPP_HSPACE:
-    case CPP_COMMENT: 
-      goto retry;
-    case CPP_NUMBER:
-      return parse_number (pfile, tok_start, tok_end);
-    case CPP_STRING:
-      cpp_error (pfile, "string constants not allowed in #if expressions");
-      op.op = ERROR;
-      return op;
-    case CPP_CHAR:
-      return parse_charconst (pfile, tok_start, tok_end);
-
-    case CPP_NAME:
-      op.op = INT;
-      op.unsignedp = 0;
-      op.value = 0;
-      if (strcmp (tok_start, "defined"))
-	{
-	  if (CPP_WARN_UNDEF (pfile) && !skip_evaluation)
-	    cpp_warning (pfile, "`%.*s' is not defined",
-			 (int) (tok_end - tok_start), tok_start);
-	}
-      else
-	{
-	  int paren = 0, len;
-	  cpp_buffer *ip = CPP_BUFFER (pfile);
-	  U_CHAR *tok;
-
-	  cpp_skip_hspace (pfile);
-	  if (*ip->cur == '(')
-	    {
-	      paren++;
-	      ip->cur++;			/* Skip over the paren */
-	      cpp_skip_hspace (pfile);
-	    }
-
-	  if (!is_idstart[*ip->cur])
-	    goto oops;
-	  if (ip->cur[0] == 'L' && (ip->cur[1] == '\'' || ip->cur[1] == '"'))
-	    goto oops;
-	  tok = ip->cur;
-	  while (is_idchar[*ip->cur])
-	    ++ip->cur;
-	  len = ip->cur - tok;
-	  cpp_skip_hspace (pfile);
-	  if (paren)
-	    {
-	      if (*ip->cur != ')')
-		goto oops;
-	      ++ip->cur;
-	    }
-	  if (cpp_lookup (pfile, tok, len, -1))
-	    op.value = 1;
-
-	}
-      return op;
-
-    oops:
-      cpp_error (pfile, "`defined' without an identifier");
-      return op;
-
-    case CPP_OTHER:
-      /* See if it is a special token of length 2.  */
-      if (tok_start + 2 == tok_end)
-        {
-	  for (toktab = tokentab2; toktab->operator != NULL; toktab++)
-	    if (tok_start[0] == toktab->operator[0]
-		&& tok_start[1] == toktab->operator[1])
-		break;
-	  if (toktab->token == ERROR)
-	    cpp_error (pfile, "`%s' not allowed in operand of `#if'",
-		       tok_start);
-	  op.op = toktab->token; 
-	  return op;
-	}
-      /* fall through */
-    default:
-      op.op = *tok_start;
-      return op;
-  }
-}
-
-
-/* Parse a C escape sequence.  STRING_PTR points to a variable
-   containing a pointer to the string to parse.  That pointer
-   is updated past the characters we use.  The value of the
-   escape sequence is returned.
-
-   A negative value means the sequence \ newline was seen,
-   which is supposed to be equivalent to nothing at all.
-
-   If \ is followed by a null character, we return a negative
-   value and leave the string pointer pointing at the null character.
-
-   If \ is followed by 000, we return 0 and leave the string pointer
-   after the zeros.  A value of 0 does not mean end of string.  */
-
-HOST_WIDEST_INT
-cpp_parse_escape (pfile, string_ptr, result_mask)
-     cpp_reader *pfile;
-     char **string_ptr;
-     HOST_WIDEST_INT result_mask;
-{
-  register int c = *(*string_ptr)++;
-  switch (c)
-    {
-    case 'a':
-      return TARGET_BELL;
-    case 'b':
-      return TARGET_BS;
-    case 'e':
-    case 'E':
-      if (CPP_OPTIONS (pfile)->pedantic)
-	cpp_pedwarn (pfile, "non-ANSI-standard escape sequence, `\\%c'", c);
-      return 033;
-    case 'f':
-      return TARGET_FF;
-    case 'n':
-      return TARGET_NEWLINE;
-    case 'r':
-      return TARGET_CR;
-    case 't':
-      return TARGET_TAB;
-    case 'v':
-      return TARGET_VT;
-    case '\n':
-      return -2;
-    case 0:
-      (*string_ptr)--;
-      return 0;
-      
-    case '0':
-    case '1':
-    case '2':
-    case '3':
-    case '4':
-    case '5':
-    case '6':
-    case '7':
-      {
-	register HOST_WIDEST_INT i = c - '0';
-	register int count = 0;
-	while (++count < 3)
-	  {
-	    c = *(*string_ptr)++;
-	    if (c >= '0' && c <= '7')
-	      i = (i << 3) + c - '0';
-	    else
-	      {
-		(*string_ptr)--;
-		break;
-	      }
-	  }
-	if (i != (i & result_mask))
-	  {
-	    i &= result_mask;
-	    cpp_pedwarn (pfile, "octal escape sequence out of range");
-	  }
-	return i;
-      }
-    case 'x':
-      {
-	register unsigned HOST_WIDEST_INT i = 0, overflow = 0;
-	register int digits_found = 0, digit;
-	for (;;)
-	  {
-	    c = *(*string_ptr)++;
-	    if (c >= '0' && c <= '9')
-	      digit = c - '0';
-	    else if (c >= 'a' && c <= 'f')
-	      digit = c - 'a' + 10;
-	    else if (c >= 'A' && c <= 'F')
-	      digit = c - 'A' + 10;
-	    else
-	      {
-		(*string_ptr)--;
-		break;
-	      }
-	    overflow |= i ^ (i << 4 >> 4);
-	    i = (i << 4) + digit;
-	    digits_found = 1;
-	  }
-	if (!digits_found)
-	  cpp_error (pfile, "\\x used with no following hex digits");
-	if (overflow | (i != (i & result_mask)))
-	  {
-	    i &= result_mask;
-	    cpp_pedwarn (pfile, "hex escape sequence out of range");
-	  }
-	return i;
-      }
-    default:
-      return c;
-    }
-}
-
-static void
-integer_overflow (pfile)
-     cpp_reader *pfile;
-{
-  if (CPP_PEDANTIC (pfile))
-    cpp_pedwarn (pfile, "integer overflow in preprocessor expression");
-}
-
-static HOST_WIDEST_INT
-left_shift (pfile, a, unsignedp, b)
-     cpp_reader *pfile;
-     HOST_WIDEST_INT a;
-     int unsignedp;
-     unsigned HOST_WIDEST_INT b;
-{
-  if (b >= HOST_BITS_PER_WIDEST_INT)
-    {
-      if (! unsignedp && a != 0)
-	integer_overflow (pfile);
-      return 0;
-    }
-  else if (unsignedp)
-    return (unsigned HOST_WIDEST_INT) a << b;
-  else
-    {
-      HOST_WIDEST_INT l = a << b;
-      if (l >> b != a)
-	integer_overflow (pfile);
-      return l;
-    }
-}
-
-static HOST_WIDEST_INT
-right_shift (pfile, a, unsignedp, b)
-     cpp_reader *pfile ATTRIBUTE_UNUSED;
-     HOST_WIDEST_INT a;
-     int unsignedp;
-     unsigned HOST_WIDEST_INT b;
-{
-  if (b >= HOST_BITS_PER_WIDEST_INT)
-    return unsignedp ? 0 : a >> (HOST_BITS_PER_WIDEST_INT - 1);
-  else if (unsignedp)
-    return (unsigned HOST_WIDEST_INT) a >> b;
-  else
-    return a >> b;
-}
-
-/* These priorities are all even, so we can handle associatively.  */
-#define PAREN_INNER_PRIO 0
-#define COMMA_PRIO 4
-#define COND_PRIO (COMMA_PRIO+2)
-#define OROR_PRIO (COND_PRIO+2)
-#define ANDAND_PRIO (OROR_PRIO+2)
-#define OR_PRIO (ANDAND_PRIO+2)
-#define XOR_PRIO (OR_PRIO+2)
-#define AND_PRIO (XOR_PRIO+2)
-#define EQUAL_PRIO (AND_PRIO+2)
-#define LESS_PRIO (EQUAL_PRIO+2)
-#define SHIFT_PRIO (LESS_PRIO+2)
-#define PLUS_PRIO (SHIFT_PRIO+2)
-#define MUL_PRIO (PLUS_PRIO+2)
-#define UNARY_PRIO (MUL_PRIO+2)
-#define PAREN_OUTER_PRIO (UNARY_PRIO+2)
-
-#define COMPARE(OP) \
-  top->unsignedp = 0;\
-  top->value = (unsigned1 || unsigned2) \
-  ? (unsigned HOST_WIDEST_INT) v1 OP (unsigned HOST_WIDEST_INT) v2 : (v1 OP v2)
-
-/* Parse and evaluate a C expression, reading from PFILE.
-   Returns the value of the expression.  */
-
-HOST_WIDEST_INT
-cpp_parse_expr (pfile)
-     cpp_reader *pfile;
-{
-  /* The implementation is an operator precedence parser,
-     i.e. a bottom-up parser, using a stack for not-yet-reduced tokens.
-
-     The stack base is 'stack', and the current stack pointer is 'top'.
-     There is a stack element for each operator (only),
-     and the most recently pushed operator is 'top->op'.
-     An operand (value) is stored in the 'value' field of the stack
-     element of the operator that precedes it.
-     In that case the 'flags' field has the HAVE_VALUE flag set.  */
-
-#define INIT_STACK_SIZE 20
-  struct operation init_stack[INIT_STACK_SIZE];
-  struct operation *stack = init_stack;
-  struct operation *limit = stack + INIT_STACK_SIZE;
-  register struct operation *top = stack;
-  int lprio, rprio = 0;
-  int skip_evaluation = 0;
-
-  top->rprio = 0;
-  top->flags = 0;
-  for (;;)
-    {
-      struct operation op;
-      char flags = 0;
-
-      /* Read a token */
-      op =  cpp_lex (pfile, skip_evaluation);
-
-      /* See if the token is an operand, in which case go to set_value.
-	 If the token is an operator, figure out its left and right
-	 priorities, and then goto maybe_reduce.  */
-
-      switch (op.op)
-	{
-	case NAME:
-	  cpp_fatal (pfile, "internal error: cpp_lex returns a NAME");
-	  goto syntax_error;
-	case INT:  case CHAR:
-	  top->value = op.value;
-	  top->unsignedp = op.unsignedp;
-	  goto set_value;
-	case 0:
-	  lprio = 0;  goto maybe_reduce;
-	case '+':  case '-':
-	  /* Is this correct if unary ? FIXME */
-	  flags = RIGHT_OPERAND_REQUIRED;
-	  lprio = PLUS_PRIO;  rprio = lprio + 1;  goto maybe_reduce;
-	case '!':  case '~':
-	  flags = RIGHT_OPERAND_REQUIRED;
-	  rprio = UNARY_PRIO;  lprio = rprio + 1;  goto maybe_reduce;
-	case '*':  case '/':  case '%':
-	  lprio = MUL_PRIO;  goto binop;
-	case '<':  case '>':  case LEQ:  case GEQ:
-	  lprio = LESS_PRIO;  goto binop;
-	case EQUAL:  case NOTEQUAL:
-	  lprio = EQUAL_PRIO;  goto binop;
-	case LSH:  case RSH:
-	  lprio = SHIFT_PRIO;  goto binop;
-	case '&':  lprio = AND_PRIO;  goto binop;
-	case '^':  lprio = XOR_PRIO;  goto binop;
-	case '|':  lprio = OR_PRIO;  goto binop;
-	case ANDAND:  lprio = ANDAND_PRIO;  goto binop;
-	case OROR:  lprio = OROR_PRIO;  goto binop;
-	case ',':
-	  lprio = COMMA_PRIO;  goto binop;
-	case '(':
-	  lprio = PAREN_OUTER_PRIO;  rprio = PAREN_INNER_PRIO;
-	  goto maybe_reduce;
-	case ')':
-	  lprio = PAREN_INNER_PRIO;  rprio = PAREN_OUTER_PRIO;
-	  goto maybe_reduce;
-        case ':':
-	  lprio = COND_PRIO;  rprio = COND_PRIO;
-	  goto maybe_reduce;
-        case '?':
-	  lprio = COND_PRIO + 1;  rprio = COND_PRIO;
-	  goto maybe_reduce;
-	case ERROR:
-	  goto syntax_error;
-	binop:
-	  flags = LEFT_OPERAND_REQUIRED|RIGHT_OPERAND_REQUIRED;
-	  rprio = lprio + 1;
-	  goto maybe_reduce;
-	default:
-	  cpp_error (pfile, "invalid character in #if");
-	  goto syntax_error;
-	}
-
-    set_value:
-      /* Push a value onto the stack.  */
-      if (top->flags & HAVE_VALUE)
-	{
-	  cpp_error (pfile, "syntax error in #if");
-	  goto syntax_error;
-	}
-      top->flags |= HAVE_VALUE;
-      continue;
-
-    maybe_reduce:
-      /* Push an operator, and check if we can reduce now.  */
-      while (top->rprio > lprio)
-	{
-	  HOST_WIDEST_INT v1 = top[-1].value, v2 = top[0].value;
-	  int unsigned1 = top[-1].unsignedp, unsigned2 = top[0].unsignedp;
-	  top--;
-	  if ((top[1].flags & LEFT_OPERAND_REQUIRED)
-	      && ! (top[0].flags & HAVE_VALUE))
-	    {
-	      cpp_error (pfile, "syntax error - missing left operand");
-	      goto syntax_error;
-	    }
-	  if ((top[1].flags & RIGHT_OPERAND_REQUIRED)
-	      && ! (top[1].flags & HAVE_VALUE))
-	    {
-	      cpp_error (pfile, "syntax error - missing right operand");
-	      goto syntax_error;
-	    }
-	  /* top[0].value = (top[1].op)(v1, v2);*/
-	  switch (top[1].op)
-	    {
-	    case '+':
-	      if (!(top->flags & HAVE_VALUE))
-		{ /* Unary '+' */
-		  top->value = v2;
-		  top->unsignedp = unsigned2;
-		  top->flags |= HAVE_VALUE;
-		}
-	      else
-		{
-		  top->value = v1 + v2;
-		  top->unsignedp = unsigned1 || unsigned2;
-		  if (! top->unsignedp && ! skip_evaluation
-		      && ! possible_sum_sign (v1, v2, top->value))
-		    integer_overflow (pfile);
-		}
-	      break;
-	    case '-':
-	      if (!(top->flags & HAVE_VALUE))
-		{ /* Unary '-' */
-		  top->value = - v2;
-		  if (!skip_evaluation && (top->value & v2) < 0 && !unsigned2)
-		    integer_overflow (pfile);
-		  top->unsignedp = unsigned2;
-		  top->flags |= HAVE_VALUE;
-		}
-	      else
-		{ /* Binary '-' */
-		  top->value = v1 - v2;
-		  top->unsignedp = unsigned1 || unsigned2;
-		  if (! top->unsignedp && ! skip_evaluation
-		      && ! possible_sum_sign (top->value, v2, v1))
-		    integer_overflow (pfile);
-		}
-	      break;
-	    case '*':
-	      top->unsignedp = unsigned1 || unsigned2;
-	      if (top->unsignedp)
-		top->value = (unsigned HOST_WIDEST_INT) v1 * v2;
-	      else if (!skip_evaluation)
-		{
-		  top->value = v1 * v2;
-		  if (v1
-		      && (top->value / v1 != v2
-			  || (top->value & v1 & v2) < 0))
-		    integer_overflow (pfile);
-		}
-	      break;
-	    case '/':
-	      if (skip_evaluation)
-		break;
-	      if (v2 == 0)
-		{
-		  cpp_error (pfile, "division by zero in #if");
-		  v2 = 1;
-		}
-	      top->unsignedp = unsigned1 || unsigned2;
-	      if (top->unsignedp)
-		top->value = (unsigned HOST_WIDEST_INT) v1 / v2;
-	      else
-		{
-		  top->value = v1 / v2;
-		  if ((top->value & v1 & v2) < 0)
-		    integer_overflow (pfile);
-		}
-	      break;
-	    case '%':
-	      if (skip_evaluation)
-		break;
-	      if (v2 == 0)
-		{
-		  cpp_error (pfile, "division by zero in #if");
-		  v2 = 1;
-		}
-	      top->unsignedp = unsigned1 || unsigned2;
-	      if (top->unsignedp)
-		top->value = (unsigned HOST_WIDEST_INT) v1 % v2;
-	      else
-		top->value = v1 % v2;
-	      break;
-	    case '!':
-	      if (top->flags & HAVE_VALUE)
-		{
-		  cpp_error (pfile, "syntax error");
-		  goto syntax_error;
-		}
-	      top->value = ! v2;
-	      top->unsignedp = 0;
-	      top->flags |= HAVE_VALUE;
-	      break;
-	    case '~':
-	      if (top->flags & HAVE_VALUE)
-		{
-		  cpp_error (pfile, "syntax error");
-		  goto syntax_error;
-		}
-	      top->value = ~ v2;
-	      top->unsignedp = unsigned2;
-	      top->flags |= HAVE_VALUE;
-	      break;
-	    case '<':  COMPARE(<);  break;
-	    case '>':  COMPARE(>);  break;
-	    case LEQ:  COMPARE(<=); break;
-	    case GEQ:  COMPARE(>=); break;
-	    case EQUAL:
-	      top->value = (v1 == v2);
-	      top->unsignedp = 0;
-	      break;
-	    case NOTEQUAL:
-	      top->value = (v1 != v2);
-	      top->unsignedp = 0;
-	      break;
-	    case LSH:
-	      if (skip_evaluation)
-		break;
-	      top->unsignedp = unsigned1;
-	      if (v2 < 0 && ! unsigned2)
-		top->value = right_shift (pfile, v1, unsigned1, -v2);
-	      else
-		top->value = left_shift (pfile, v1, unsigned1, v2);
-	      break;
-	    case RSH:
-	      if (skip_evaluation)
-		break;
-	      top->unsignedp = unsigned1;
-	      if (v2 < 0 && ! unsigned2)
-		top->value = left_shift (pfile, v1, unsigned1, -v2);
-	      else
-		top->value = right_shift (pfile, v1, unsigned1, v2);
-	      break;
-#define LOGICAL(OP) \
-	      top->value = v1 OP v2;\
-	      top->unsignedp = unsigned1 || unsigned2;
-	    case '&':  LOGICAL(&); break;
-	    case '^':  LOGICAL(^);  break;
-	    case '|':  LOGICAL(|);  break;
-	    case ANDAND:
-	      top->value = v1 && v2;  top->unsignedp = 0;
-	      if (!v1) skip_evaluation--;
-	      break;
-	    case OROR:
-	      top->value = v1 || v2;  top->unsignedp = 0;
-	      if (v1) skip_evaluation--;
-	      break;
-	    case ',':
-	      if (CPP_PEDANTIC (pfile))
-		cpp_pedwarn (pfile, "comma operator in operand of `#if'");
-	      top->value = v2;
-	      top->unsignedp = unsigned2;
-	      break;
-	    case '(':  case '?':
-	      cpp_error (pfile, "syntax error in #if");
-	      goto syntax_error;
-	    case ':':
-	      if (top[0].op != '?')
-		{
-		  cpp_error (pfile,
-			     "syntax error ':' without preceding '?'");
-		  goto syntax_error;
-		}
-	      else if (! (top[1].flags & HAVE_VALUE)
-		       || !(top[-1].flags & HAVE_VALUE)
-		       || !(top[0].flags & HAVE_VALUE))
-		{
-		  cpp_error (pfile, "bad syntax for ?: operator");
-		  goto syntax_error;
-		}
-	      else
-		{
-		  top--;
-		  if (top->value) skip_evaluation--;
-		  top->value = top->value ? v1 : v2;
-		  top->unsignedp = unsigned1 || unsigned2;
-		}
-	      break;
-	    case ')':
-	      if ((top[1].flags & HAVE_VALUE)
-		  || ! (top[0].flags & HAVE_VALUE)
-		  || top[0].op != '('
-		  || (top[-1].flags & HAVE_VALUE))
-		{
-		  cpp_error (pfile, "mismatched parentheses in #if");
-		  goto syntax_error;
-		}
-	      else
-		{
-		  top--;
-		  top->value = v1;
-		  top->unsignedp = unsigned1;
-		  top->flags |= HAVE_VALUE;
-		}
-	      break;
-	    default:
-	      cpp_error (pfile,
-			 (top[1].op >= ' ' && top[1].op <= '~'
-			  ? "unimplemented operator '%c'\n"
-			  : "unimplemented operator '\\%03o'\n"),
-			 top[1].op);
-	    }
-	}
-      if (op.op == 0)
-	{
-	  if (top != stack)
-	    cpp_error (pfile, "internal error in #if expression");
-	  if (stack != init_stack)
-	    free (stack);
-	  return top->value;
-	}
-      top++;
-      
-      /* Check for and handle stack overflow.  */
-      if (top == limit)
-	{
-	  struct operation *new_stack;
-	  int old_size = (char *) limit - (char *) stack;
-	  int new_size = 2 * old_size;
-	  if (stack != init_stack)
-	    new_stack = (struct operation *) xrealloc (stack, new_size);
-	  else
-	    {
-	      new_stack = (struct operation *) xmalloc (new_size);
-	      bcopy ((char *) stack, (char *) new_stack, old_size);
-	    }
-	  stack = new_stack;
-	  top = (struct operation *) ((char *) new_stack + old_size);
-	  limit = (struct operation *) ((char *) new_stack + new_size);
-	}
-      
-      top->flags = flags;
-      top->rprio = rprio;
-      top->op = op.op;
-      if ((op.op == OROR && top[-1].value)
-	  || (op.op == ANDAND && !top[-1].value)
-	  || (op.op == '?' && !top[-1].value))
-	{
-	  skip_evaluation++;
-	}
-      else if (op.op == ':')
-	{
-	  if (top[-2].value) /* Was condition true? */
-	    skip_evaluation++;
-	  else
-	    skip_evaluation--;
-	}
-    }
- syntax_error:
-  if (stack != init_stack)
-    free (stack);
-  skip_rest_of_line (pfile);
-  return 0;
-}