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 "toplev.h"
  28 #include "c-family/c-pragma.h"
  29 #include "cpplib.h"
  30 #include "hard-reg-set.h"
  31 #include "output.h"
  32 #include "m32c-protos.h"
  33 #include "function.h"
  34 #define MAX_RECOG_OPERANDS 10
  35 #include "reload.h"
  36 #include "target.h"
  37
  38 /* Implements the "GCC memregs" pragma.  This pragma takes only an
  39    integer, and is semantically identical to the -memregs= command
  40    line option.  The only catch is, the programmer should only use
  41    this pragma at the beginning of the file (preferably, in some
  42    project-wide header) to avoid ABI changes related to changing the
  43    list of available "registers".  */
  44 static void
  45 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
  46 {
  47   /* on off */
  48   tree val;
  49   enum cpp_ttype type;
  50   HOST_WIDE_INT i;
  51   static char new_number[3];
  52
  53   type = pragma_lex (&val);
  54   if (type == CPP_NUMBER)
  55     {
  56       if (host_integerp (val, 1))
  57         {
  58           i = tree_low_cst (val, 1);
  59
  60           type = pragma_lex (&val);
  61           if (type != CPP_EOF)
  62             warning (0, "junk at end of #pragma GCC memregs [0..16]");
  63
  64           if (0 <= i && i <= 16)
  65             {
  66               if (!ok_to_change_target_memregs)
  67                 {
  68                   warning (0,
  69                            "#pragma GCC memregs must precede any function decls");
  70                   return;
  71                 }
  72               new_number[0] = (i / 10) + '0';
  73               new_number[1] = (i % 10) + '0';
  74               new_number[2] = 0;
  75               target_memregs = new_number;
  76               m32c_conditional_register_usage ();
  77             }
  78           else
  79             {
  80               warning (0, "#pragma GCC memregs takes a number [0..16]");
  81             }
  82
  83           return;
  84         }
  85     }
  86
  87   error ("#pragma GCC memregs takes a number [0..16]");
  88 }
  89
  90 /* Implements the "pragma ADDRESS" pragma.  This pragma takes a
  91    variable name and an address, and arranges for that variable to be
  92    "at" that address.  The variable is also made volatile.  */
  93 static void
  94 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
  95 {
  96   /* on off */
  97   tree var, addr;
  98   enum cpp_ttype type;
  99   const char *var_str;
 100
 101   type = pragma_lex (&var);
 102   if (type == CPP_NAME)
 103     {
 104       var_str = IDENTIFIER_POINTER (var);
 105
 106       type = pragma_lex (&addr);
 107       if (type == CPP_NUMBER)
 108         {
 109           if (var != error_mark_node)
 110             {
 111               unsigned uaddr = tree_low_cst (addr, 1);
 112               m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
 113             }
 114
 115           type = pragma_lex (&var);
 116           if (type != CPP_EOF)
 117             {
 118               error ("junk at end of #pragma ADDRESS");
 119             }
 120           return;
 121         }
 122     }
 123   error ("malformed #pragma ADDRESS variable address");
 124 }
 125
 126 /* Implements REGISTER_TARGET_PRAGMAS.  */
 127 void
 128 m32c_register_pragmas (void)
 129 {
 130   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
 131   c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
 132   c_register_pragma (NULL, "address", m32c_pragma_address);
 133 }