gcc/config/m32c/m32c-pragma.c

   1 /* M32C Pragma support
   2    Copyright (C) 2004-2015 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 "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "tree.h"
  26 #include "c-family/c-pragma.h"
  27 #include "c-family/c-common.h"
  28 #include "diagnostic-core.h"
  29 #include "cpplib.h"
  30 #include "m32c-protos.h"
  31
  32 /* Implements the "GCC memregs" pragma.  This pragma takes only an
  33    integer, and is semantically identical to the -memregs= command
  34    line option.  The only catch is, the programmer should only use
  35    this pragma at the beginning of the file (preferably, in some
  36    project-wide header) to avoid ABI changes related to changing the
  37    list of available "registers".  */
  38 static void
  39 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
  40 {
  41   /* on off */
  42   tree val;
  43   enum cpp_ttype type;
  44   HOST_WIDE_INT i;
  45
  46   type = pragma_lex (&val);
  47   if (type == CPP_NUMBER)
  48     {
  49       if (tree_fits_uhwi_p (val))
  50         {
  51           i = tree_to_uhwi (val);
  52
  53           type = pragma_lex (&val);
  54           if (type != CPP_EOF)
  55             warning (0, "junk at end of #pragma GCC memregs [0..16]");
  56
  57           if (0 <= i && i <= 16)
  58             {
  59               if (!ok_to_change_target_memregs)
  60                 {
  61                   warning (0,
  62                            "#pragma GCC memregs must precede any function decls");
  63                   return;
  64                 }
  65               target_memregs = i;
  66               m32c_conditional_register_usage ();
  67             }
  68           else
  69             {
  70               warning (0, "#pragma GCC memregs takes a number [0..16]");
  71             }
  72
  73           return;
  74         }
  75     }
  76
  77   error ("#pragma GCC memregs takes a number [0..16]");
  78 }
  79
  80 /* Implements the "pragma ADDRESS" pragma.  This pragma takes a
  81    variable name and an address, and arranges for that variable to be
  82    "at" that address.  The variable is also made volatile.  */
  83 static void
  84 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
  85 {
  86   /* on off */
  87   tree var, addr;
  88   enum cpp_ttype type;
  89
  90   type = pragma_lex (&var);
  91   if (type == CPP_NAME)
  92     {
  93       type = pragma_lex (&addr);
  94       if (type == CPP_NUMBER)
  95         {
  96           if (var != error_mark_node)
  97             {
  98               unsigned uaddr = tree_to_uhwi (addr);
  99               m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
 100             }
 101
 102           type = pragma_lex (&var);
 103           if (type != CPP_EOF)
 104             {
 105               error ("junk at end of #pragma ADDRESS");
 106             }
 107           return;
 108         }
 109     }
 110   error ("malformed #pragma ADDRESS variable address");
 111 }
 112
 113 /* Implements REGISTER_TARGET_PRAGMAS.  */
 114 void
 115 m32c_register_pragmas (void)
 116 {
 117   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
 118   c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
 119   c_register_pragma (NULL, "address", m32c_pragma_address);
 120
 121   /* R8C and M16C have 16-bit pointers in a 20-bit address zpace.
 122      M32C has 24-bit pointers in a 24-bit address space, so does not
 123      need far pointers, but we accept the qualifier anyway, as a
 124      no-op.  */
 125   if (TARGET_A16)
 126     c_register_addr_space ("__far", ADDR_SPACE_FAR);
 127   else
 128     c_register_addr_space ("__far", ADDR_SPACE_GENERIC);
 129 }