gcc/config/arm/pe.c

   1 /* Routines for GCC for ARM/pe.
   2    Copyright (C) 1995, 1996, 2000, 2001, 2002, 2004, 2005
   3    Free Software Foundation, Inc.
   4    Contributed by Doug Evans (dje@cygnus.com).
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 2, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING.  If not, write to
  20    the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28 #include "output.h"
  29 #include "flags.h"
  30 #include "tree.h"
  31 #include "expr.h"
  32 #include "toplev.h"
  33 #include "tm_p.h"
  34
  35 extern int current_function_anonymous_args;
  36
  37 \f
  38 /* Return nonzero if DECL is a dllexport'd object.  */
  39
  40 tree current_class_type; /* FIXME */
  41
  42 int
  43 arm_dllexport_p (decl)
  44      tree decl;
  45 {
  46   tree exp;
  47
  48   if (TREE_CODE (decl) != VAR_DECL
  49       && TREE_CODE (decl) != FUNCTION_DECL)
  50     return 0;
  51   exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
  52   if (exp)
  53     return 1;
  54
  55   return 0;
  56 }
  57
  58 /* Return nonzero if DECL is a dllimport'd object.  */
  59
  60 int
  61 arm_dllimport_p (decl)
  62      tree decl;
  63 {
  64   tree imp;
  65
  66   if (TREE_CODE (decl) == FUNCTION_DECL
  67       && TARGET_NOP_FUN_DLLIMPORT)
  68     return 0;
  69
  70   if (TREE_CODE (decl) != VAR_DECL
  71       && TREE_CODE (decl) != FUNCTION_DECL)
  72     return 0;
  73   imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
  74   if (imp)
  75     return 1;
  76
  77   return 0;
  78 }
  79
  80 /* Return nonzero if SYMBOL is marked as being dllexport'd.  */
  81
  82 int
  83 arm_dllexport_name_p (symbol)
  84      const char * symbol;
  85 {
  86   return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.';
  87 }
  88
  89 /* Return nonzero if SYMBOL is marked as being dllimport'd.  */
  90
  91 int
  92 arm_dllimport_name_p (symbol)
  93      const char * symbol;
  94 {
  95   return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.';
  96 }
  97
  98 /* Mark a DECL as being dllexport'd.
  99    Note that we override the previous setting (e.g.: dllimport).  */
 100
 101 void
 102 arm_mark_dllexport (decl)
 103      tree decl;
 104 {
 105   const char * oldname;
 106   char * newname;
 107   rtx rtlname;
 108   tree idp;
 109
 110   rtlname = XEXP (DECL_RTL (decl), 0);
 111   if (GET_CODE (rtlname) == MEM)
 112     rtlname = XEXP (rtlname, 0);
 113   gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
 114   oldname = XSTR (rtlname, 0);
 115
 116   if (arm_dllimport_name_p (oldname))
 117     oldname += 9;
 118   else if (arm_dllexport_name_p (oldname))
 119     return; /* already done */
 120
 121   newname = alloca (strlen (oldname) + 4);
 122   sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, oldname);
 123
 124   /* We pass newname through get_identifier to ensure it has a unique
 125      address.  RTL processing can sometimes peek inside the symbol ref
 126      and compare the string's addresses to see if two symbols are
 127      identical.  */
 128   /* ??? At least I think that's why we do this.  */
 129   idp = get_identifier (newname);
 130
 131   XEXP (DECL_RTL (decl), 0) =
 132     gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (idp));
 133 }
 134
 135 /* Mark a DECL as being dllimport'd.  */
 136
 137 void
 138 arm_mark_dllimport (decl)
 139      tree decl;
 140 {
 141   const char * oldname;
 142   char * newname;
 143   tree idp;
 144   rtx rtlname, newrtl;
 145
 146   rtlname = XEXP (DECL_RTL (decl), 0);
 147
 148   if (GET_CODE (rtlname) == MEM)
 149     rtlname = XEXP (rtlname, 0);
 150   gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
 151   oldname = XSTR (rtlname, 0);
 152
 153   gcc_assert (!arm_dllexport_name_p (oldname));
 154   if (arm_dllimport_name_p (oldname))
 155     return; /* already done */
 156
 157   /* ??? One can well ask why we're making these checks here,
 158      and that would be a good question.  */
 159
 160   /* Imported variables can't be initialized.  */
 161   if (TREE_CODE (decl) == VAR_DECL
 162       && !DECL_VIRTUAL_P (decl)
 163       && DECL_INITIAL (decl))
 164     {
 165       error ("initialized variable %q+D is marked dllimport", decl);
 166       return;
 167     }
 168   /* Nor can they be static.  */
 169   if (TREE_CODE (decl) == VAR_DECL
 170       /* ??? Is this test for vtables needed?  */
 171       && !DECL_VIRTUAL_P (decl)
 172       && 0 /*???*/)
 173     {
 174       error ("static variable %q+D is marked dllimport", decl);
 175       return;
 176     }
 177
 178   /* `extern' needn't be specified with dllimport.
 179      Specify `extern' now and hope for the best.  Sigh.  */
 180   if (TREE_CODE (decl) == VAR_DECL
 181       /* ??? Is this test for vtables needed?  */
 182       && !DECL_VIRTUAL_P (decl))
 183     {
 184       DECL_EXTERNAL (decl) = 1;
 185       TREE_PUBLIC (decl) = 1;
 186     }
 187
 188   newname = alloca (strlen (oldname) + 11);
 189   sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, oldname);
 190
 191   /* We pass newname through get_identifier to ensure it has a unique
 192      address.  RTL processing can sometimes peek inside the symbol ref
 193      and compare the string's addresses to see if two symbols are
 194      identical.  */
 195   /* ??? At least I think that's why we do this.  */
 196   idp = get_identifier (newname);
 197
 198   newrtl = gen_rtx_MEM (Pmode,
 199                         gen_rtx_SYMBOL_REF (Pmode,
 200                                             IDENTIFIER_POINTER (idp)));
 201   XEXP (DECL_RTL (decl), 0) = newrtl;
 202 }
 203
 204 void
 205 arm_pe_encode_section_info (decl, rtl, first)
 206      tree decl;
 207      rtx rtl;
 208      int first ATTRIBUTE_UNUSED;
 209 {
 210   /* This bit is copied from arm_encode_section_info.  */
 211   if (optimize > 0 && TREE_CONSTANT (decl))
 212     SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
 213
 214   /* Mark the decl so we can tell from the rtl whether the object is
 215      dllexport'd or dllimport'd.  */
 216   if (arm_dllexport_p (decl))
 217     arm_mark_dllexport (decl);
 218   else if (arm_dllimport_p (decl))
 219     arm_mark_dllimport (decl);
 220   /* It might be that DECL has already been marked as dllimport, but a
 221      subsequent definition nullified that.  The attribute is gone but
 222      DECL_RTL still has @i.__imp_foo.  We need to remove that.  */
 223   else if ((TREE_CODE (decl) == FUNCTION_DECL
 224             || TREE_CODE (decl) == VAR_DECL)
 225            && DECL_RTL (decl) != NULL_RTX
 226            && GET_CODE (DECL_RTL (decl)) == MEM
 227            && GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
 228            && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
 229            && arm_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
 230     {
 231       const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
 232       tree idp = get_identifier (oldname + 9);
 233       rtx newrtl = gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (idp));
 234
 235       XEXP (DECL_RTL (decl), 0) = newrtl;
 236
 237       /* We previously set TREE_PUBLIC and DECL_EXTERNAL.
 238          ??? We leave these alone for now.  */
 239     }
 240 }
 241
 242 void
 243 arm_pe_unique_section (decl, reloc)
 244      tree decl;
 245      int reloc;
 246 {
 247   int len;
 248   const char * name;
 249   char * string;
 250   const char * prefix;
 251
 252   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
 253   name = arm_strip_name_encoding (name);
 254
 255   /* The object is put in, for example, section .text$foo.
 256      The linker will then ultimately place them in .text
 257      (everything from the $ on is stripped).  */
 258   if (TREE_CODE (decl) == FUNCTION_DECL)
 259     prefix = ".text$";
 260   else if (decl_readonly_section (decl, reloc))
 261     prefix = ".rdata$";
 262   else
 263     prefix = ".data$";
 264   len = strlen (name) + strlen (prefix);
 265   string = alloca (len + 1);
 266   sprintf (string, "%s%s", prefix, name);
 267
 268   DECL_SECTION_NAME (decl) = build_string (len, string);
 269 }