gcc/config/m32c/m32c-pragma.c

   1 /* M32C Pragma support
   2    Copyright (C) 2004, 2007 Free Software Foundation, Inc.
   3    Contributed by Red Hat, Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <stdio.h>
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "tree.h"
  27 #include "rtl.h"
  28 #include "toplev.h"
  29 #include "c-pragma.h"
  30 #include "cpplib.h"
  31 #include "hard-reg-set.h"
  32 #include "output.h"
  33 #include "m32c-protos.h"
  34 #include "function.h"
  35 #define MAX_RECOG_OPERANDS 10
  36 #include "reload.h"
  37 #include "target.h"
  38
  39 /* Implements the "GCC memregs" pragma.  This pragma takes only an
  40    integer, and is semantically identical to the -memregs= command
  41    line option.  The only catch is, the programmer should only use
  42    this pragma at the beginning of the file (preferably, in some
  43    project-wide header) to avoid ABI changes related to changing the
  44    list of available "registers".  */
  45 static void
  46 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
  47 {
  48   /* on off */
  49   tree val;
  50   enum cpp_ttype type;
  51   HOST_WIDE_INT i;
  52   static char new_number[3];
  53
  54   type = pragma_lex (&val);
  55   if (type == CPP_NUMBER)
  56     {
  57       if (host_integerp (val, 1))
  58         {
  59           i = tree_low_cst (val, 1);
  60
  61           type = pragma_lex (&val);
  62           if (type != CPP_EOF)
  63             warning (0, "junk at end of #pragma GCC memregs [0..16]");
  64
  65           if (0 <= i && i <= 16)
  66             {
  67               if (!ok_to_change_target_memregs)
  68                 {
  69                   warning (0,
  70                            "#pragma GCC memregs must precede any function decls");
  71                   return;
  72                 }
  73               new_number[0] = (i / 10) + '0';
  74               new_number[1] = (i % 10) + '0';
  75               new_number[2] = 0;
  76               target_memregs = new_number;
  77               m32c_conditional_register_usage ();
  78             }
  79           else
  80             {
  81               warning (0, "#pragma GCC memregs takes a number [0..16]");
  82             }
  83
  84           return;
  85         }
  86     }
  87
  88   error ("#pragma GCC memregs takes a number [0..16]");
  89 }
  90
  91 /* Implements REGISTER_TARGET_PRAGMAS.  */
  92 void
  93 m32c_register_pragmas (void)
  94 {
  95   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
  96 }