gcc/config/rs6000/rs6000-c.c

   1 /* Subroutines for the C front end on the POWER and PowerPC architectures.
   2    Copyright (C) 2002
   3    Free Software Foundation, Inc.
   4
   5    Contributed by Zack Weinberg <zack@codesourcery.com>
   6
   7 This file is part of GNU CC.
   8
   9 GNU CC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU CC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "cpplib.h"
  27 #include "tree.h"
  28 #include "c-lex.h"
  29 #include "errors.h"
  30 #include "tm_p.h"
  31
  32 /* Handle the machine specific pragma longcall.  Its syntax is
  33
  34    # pragma longcall ( TOGGLE )
  35
  36    where TOGGLE is either 0 or 1.
  37
  38    rs6000_default_long_calls is set to the value of TOGGLE, changing
  39    whether or not new function declarations receive a longcall
  40    attribute by default.  */
  41
  42 #define SYNTAX_ERROR(msgid) do {                                        \
  43   warning (msgid);                                      \
  44   warning ("ignoring malformed #pragma longcall");      \
  45   return;                                               \
  46 } while (0)
  47
  48 void
  49 rs6000_pragma_longcall (pfile)
  50      cpp_reader *pfile ATTRIBUTE_UNUSED;
  51 {
  52   tree x, n;
  53
  54   /* If we get here, generic code has already scanned the directive
  55      leader and the word "longcall".  */
  56
  57   if (c_lex (&x) != CPP_OPEN_PAREN)
  58     SYNTAX_ERROR ("missing open paren");
  59   if (c_lex (&n) != CPP_NUMBER)
  60     SYNTAX_ERROR ("missing number");
  61   if (c_lex (&x) != CPP_CLOSE_PAREN)
  62     SYNTAX_ERROR ("missing close paren");
  63
  64   if (n != integer_zero_node && n != integer_one_node)
  65     SYNTAX_ERROR ("number must be 0 or 1");
  66
  67   if (c_lex (&x) != CPP_EOF)
  68     warning ("junk at end of #pragma longcall");
  69
  70   rs6000_default_long_calls = (n == integer_one_node);
  71 }