gcc/config/m32c/m32c-pragma.c

   1 /* M32C Pragma support
   2    Copyright (C) 2004-2017 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 "c-family/c-common.h"
  26 #include "c-family/c-pragma.h"
  27 #include "m32c-protos.h"
  28
  29 /* Implements the "GCC memregs" pragma.  This pragma takes only an
  30    integer, and is semantically identical to the -memregs= command
  31    line option.  The only catch is, the programmer should only use
  32    this pragma at the beginning of the file (preferably, in some
  33    project-wide header) to avoid ABI changes related to changing the
  34    list of available "registers".  */
  35 static void
  36 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
  37 {
  38   /* on off */
  39   tree val;
  40   enum cpp_ttype type;
  41   HOST_WIDE_INT i;
  42
  43   type = pragma_lex (&val);
  44   if (type == CPP_NUMBER)
  45     {
  46       if (tree_fits_uhwi_p (val))
  47         {
  48           i = tree_to_uhwi (val);
  49
  50           type = pragma_lex (&val);
  51           if (type != CPP_EOF)
  52             warning (0, "junk at end of #pragma GCC memregs [0..16]");
  53
  54           if (0 <= i && i <= 16)
  55             {
  56               if (!ok_to_change_target_memregs)
  57                 {
  58                   warning (0,
  59                            "#pragma GCC memregs must precede any function decls");
  60                   return;
  61                 }
  62               target_memregs = i;
  63               m32c_conditional_register_usage ();
  64             }
  65           else
  66             {
  67               warning (0, "#pragma GCC memregs takes a number [0..16]");
  68             }
  69
  70           return;
  71         }
  72     }
  73
  74   error ("#pragma GCC memregs takes a number [0..16]");
  75 }
  76
  77 /* Implements the "pragma ADDRESS" pragma.  This pragma takes a
  78    variable name and an address, and arranges for that variable to be
  79    "at" that address.  The variable is also made volatile.  */
  80 static void
  81 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
  82 {
  83   /* on off */
  84   tree var, addr;
  85   enum cpp_ttype type;
  86
  87   type = pragma_lex (&var);
  88   if (type == CPP_NAME)
  89     {
  90       type = pragma_lex (&addr);
  91       if (type == CPP_NUMBER)
  92         {
  93           if (var != error_mark_node)
  94             {
  95               unsigned uaddr = tree_to_uhwi (addr);
  96               m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
  97             }
  98
  99           type = pragma_lex (&var);
 100           if (type != CPP_EOF)
 101             {
 102               error ("junk at end of #pragma ADDRESS");
 103             }
 104           return;
 105         }
 106     }
 107   error ("malformed #pragma ADDRESS variable address");
 108 }
 109
 110 /* Implements REGISTER_TARGET_PRAGMAS.  */
 111 void
 112 m32c_register_pragmas (void)
 113 {
 114   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
 115   c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
 116   c_register_pragma (NULL, "address", m32c_pragma_address);
 117
 118   /* R8C and M16C have 16-bit pointers in a 20-bit address zpace.
 119      M32C has 24-bit pointers in a 24-bit address space, so does not
 120      need far pointers, but we accept the qualifier anyway, as a
 121      no-op.  */
 122   if (TARGET_A16)
 123     c_register_addr_space ("__far", ADDR_SPACE_FAR);
 124   else
 125     c_register_addr_space ("__far", ADDR_SPACE_GENERIC);
 126 }