gcc/config/m32c/m32c-pragma.c

   1 /* M32C Pragma support
   2    Copyright (C) 2004, 2007, 2010 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 "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
  52   type = pragma_lex (&val);
  53   if (type == CPP_NUMBER)
  54     {
  55       if (host_integerp (val, 1))
  56         {
  57           i = tree_low_cst (val, 1);
  58
  59           type = pragma_lex (&val);
  60           if (type != CPP_EOF)
  61             warning (0, "junk at end of #pragma GCC memregs [0..16]");
  62
  63           if (0 <= i && i <= 16)
  64             {
  65               if (!ok_to_change_target_memregs)
  66                 {
  67                   warning (0,
  68                            "#pragma GCC memregs must precede any function decls");
  69                   return;
  70                 }
  71               target_memregs = i;
  72               m32c_conditional_register_usage ();
  73             }
  74           else
  75             {
  76               warning (0, "#pragma GCC memregs takes a number [0..16]");
  77             }
  78
  79           return;
  80         }
  81     }
  82
  83   error ("#pragma GCC memregs takes a number [0..16]");
  84 }
  85
  86 /* Implements the "pragma ADDRESS" pragma.  This pragma takes a
  87    variable name and an address, and arranges for that variable to be
  88    "at" that address.  The variable is also made volatile.  */
  89 static void
  90 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
  91 {
  92   /* on off */
  93   tree var, addr;
  94   enum cpp_ttype type;
  95
  96   type = pragma_lex (&var);
  97   if (type == CPP_NAME)
  98     {
  99       type = pragma_lex (&addr);
 100       if (type == CPP_NUMBER)
 101         {
 102           if (var != error_mark_node)
 103             {
 104               unsigned uaddr = tree_low_cst (addr, 1);
 105               m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
 106             }
 107
 108           type = pragma_lex (&var);
 109           if (type != CPP_EOF)
 110             {
 111               error ("junk at end of #pragma ADDRESS");
 112             }
 113           return;
 114         }
 115     }
 116   error ("malformed #pragma ADDRESS variable address");
 117 }
 118
 119 /* Implements REGISTER_TARGET_PRAGMAS.  */
 120 void
 121 m32c_register_pragmas (void)
 122 {
 123   c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
 124   c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
 125   c_register_pragma (NULL, "address", m32c_pragma_address);
 126
 127   /* R8C and M16C have 16-bit pointers in a 20-bit address zpace.
 128      M32C has 24-bit pointers in a 24-bit address space, so does not
 129      need far pointers, but we accept the qualifier anyway, as a
 130      no-op.  */
 131   if (TARGET_A16)
 132     c_register_addr_space ("__far", ADDR_SPACE_FAR);
 133   else
 134     c_register_addr_space ("__far", ADDR_SPACE_GENERIC);
 135 }