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 "hash-set.h"
  26 #include "machmode.h"
  27 #include "vec.h"
  28 #include "double-int.h"
  29 #include "input.h"
  30 #include "alias.h"
  31 #include "symtab.h"
  32 #include "wide-int.h"
  33 #include "inchash.h"
  34 #include "tree.h"
  35 #include "c-family/c-pragma.h"
  36 #include "c-family/c-common.h"
  37 #include "diagnostic-core.h"
  38 #include "cpplib.h"
  39 #include "m32c-protos.h"
  40
  41 /* Implements the "GCC memregs" pragma.  This pragma takes only an
  42    integer, and is semantically identical to the -memregs= command
  43    line option.  The only catch is, the programmer should only use
  44    this pragma at the beginning of the file (preferably, in some
  45    project-wide header) to avoid ABI changes related to changing the
  46    list of available "registers".  */
  47 static void
  48 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
  49 {
  50   /* on off */
  51   tree val;
  52   enum cpp_ttype type;
  53   HOST_WIDE_INT i;
  54
  55   type = pragma_lex (&val);
  56   if (type == CPP_NUMBER)
  57     {
  58       if (tree_fits_uhwi_p (val))
  59         {
  60           i = tree_to_uhwi (val);
  61
  62           type = pragma_lex (&val);
  63           if (type != CPP_EOF)
  64             warning (0, "junk at end of #pragma GCC memregs [0..16]");
  65
  66           if (0 <= i && i <= 16)
  67             {
  68               if (!ok_to_change_target_memregs)
  69                 {
  70                   warning (0,
  71                            "#pragma GCC memregs must precede any function decls");
  72                   return;
  73                 }
  74               target_memregs = i;
  75               m32c_conditional_register_usage ();
  76             }
  77           else
  78             {
  79               warning (0, "#pragma GCC memregs takes a number [0..16]");
  80             }
  81
  82           return;
  83         }
  84     }
  85
  86   error ("#pragma GCC memregs takes a number [0..16]");
  87 }
  88
  89 /* Implements the "pragma ADDRESS" pragma.  This pragma takes a
  90    variable name and an address, and arranges for that variable to be
  91    "at" that address.  The variable is also made volatile.  */
  92 static void
  93 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
  94 {
  95   /* on off */
  96   tree var, addr;
  97   enum cpp_ttype type;
  98
  99   type = pragma_lex (&var);
 100   if (type == CPP_NAME)
 101     {
 102       type = pragma_lex (&addr);
 103       if (type == CPP_NUMBER)
 104         {
 105           if (var != error_mark_node)
 106             {
 107               unsigned uaddr = tree_to_uhwi (addr);
 108               m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
 109             }
 110
 111           type = pragma_lex (&var);
 112           if (type != CPP_EOF)
 113             {
 114               error ("junk at end of #pragma ADDRESS");
 115             }
 116           return;
 117         }
 118     }
 119   error ("malformed #pragma ADDRESS variable address");
 120 }
 121
 122 /* Implements REGISTER_TARGET_PRAGMAS.  */
 123 void
 124 m32c_register_pragmas (void)
 125 {
 126   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
 127   c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
 128   c_register_pragma (NULL, "address", m32c_pragma_address);
 129
 130   /* R8C and M16C have 16-bit pointers in a 20-bit address zpace.
 131      M32C has 24-bit pointers in a 24-bit address space, so does not
 132      need far pointers, but we accept the qualifier anyway, as a
 133      no-op.  */
 134   if (TARGET_A16)
 135     c_register_addr_space ("__far", ADDR_SPACE_FAR);
 136   else
 137     c_register_addr_space ("__far", ADDR_SPACE_GENERIC);
 138 }