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 "c-family/c-pragma.h"
  28 #include "c-family/c-common.h"
  29 #include "diagnostic-core.h"
  30 #include "toplev.h"
  31 #include "cpplib.h"
  32 #include "hard-reg-set.h"
  33 #include "output.h"
  34 #include "m32c-protos.h"
  35 #include "function.h"
  36 #define MAX_RECOG_OPERANDS 10
  37 #include "reload.h"
  38 #include "target.h"
  39
  40 /* Implements the "GCC memregs" pragma.  This pragma takes only an
  41    integer, and is semantically identical to the -memregs= command
  42    line option.  The only catch is, the programmer should only use
  43    this pragma at the beginning of the file (preferably, in some
  44    project-wide header) to avoid ABI changes related to changing the
  45    list of available "registers".  */
  46 static void
  47 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
  48 {
  49   /* on off */
  50   tree val;
  51   enum cpp_ttype type;
  52   HOST_WIDE_INT i;
  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               target_memregs = i;
  74               m32c_conditional_register_usage ();
  75             }
  76           else
  77             {
  78               warning (0, "#pragma GCC memregs takes a number [0..16]");
  79             }
  80
  81           return;
  82         }
  83     }
  84
  85   error ("#pragma GCC memregs takes a number [0..16]");
  86 }
  87
  88 /* Implements the "pragma ADDRESS" pragma.  This pragma takes a
  89    variable name and an address, and arranges for that variable to be
  90    "at" that address.  The variable is also made volatile.  */
  91 static void
  92 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
  93 {
  94   /* on off */
  95   tree var, addr;
  96   enum cpp_ttype type;
  97
  98   type = pragma_lex (&var);
  99   if (type == CPP_NAME)
 100     {
 101       type = pragma_lex (&addr);
 102       if (type == CPP_NUMBER)
 103         {
 104           if (var != error_mark_node)
 105             {
 106               unsigned uaddr = tree_low_cst (addr, 1);
 107               m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
 108             }
 109
 110           type = pragma_lex (&var);
 111           if (type != CPP_EOF)
 112             {
 113               error ("junk at end of #pragma ADDRESS");
 114             }
 115           return;
 116         }
 117     }
 118   error ("malformed #pragma ADDRESS variable address");
 119 }
 120
 121 /* Implements REGISTER_TARGET_PRAGMAS.  */
 122 void
 123 m32c_register_pragmas (void)
 124 {
 125   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
 126   c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
 127   c_register_pragma (NULL, "address", m32c_pragma_address);
 128
 129   /* R8C and M16C have 16-bit pointers in a 20-bit address zpace.
 130      M32C has 24-bit pointers in a 24-bit address space, so does not
 131      need far pointers, but we accept the qualifier anyway, as a
 132      no-op.  */
 133   if (TARGET_A16)
 134     c_register_addr_space ("__far", ADDR_SPACE_FAR);
 135   else
 136     c_register_addr_space ("__far", ADDR_SPACE_GENERIC);
 137 }