gcc/config/arm/pe.c

   1 /* Routines for GCC for ARM/pe.
   2    Copyright (C) 1995, 1996, 2000, 2001, 2002 Free Software Foundation, Inc.
   3    Contributed by Doug Evans (dje@cygnus.com).
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 2, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    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 COPYING.  If not, write to
  19    the Free Software Foundation, 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "rtl.h"
  27 #include "output.h"
  28 #include "flags.h"
  29 #include "tree.h"
  30 #include "expr.h"
  31 #include "toplev.h"
  32 #include "tm_p.h"
  33
  34 extern int current_function_anonymous_args;
  35
  36 \f
  37 /* Return nonzero if DECL is a dllexport'd object.  */
  38
  39 tree current_class_type; /* FIXME */
  40
  41 int
  42 arm_dllexport_p (decl)
  43      tree decl;
  44 {
  45   tree exp;
  46
  47   if (TREE_CODE (decl) != VAR_DECL
  48       && TREE_CODE (decl) != FUNCTION_DECL)
  49     return 0;
  50   exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
  51   if (exp)
  52     return 1;
  53
  54   return 0;
  55 }
  56
  57 /* Return nonzero if DECL is a dllimport'd object.  */
  58
  59 int
  60 arm_dllimport_p (decl)
  61      tree decl;
  62 {
  63   tree imp;
  64
  65   if (TREE_CODE (decl) == FUNCTION_DECL
  66       && TARGET_NOP_FUN_DLLIMPORT)
  67     return 0;
  68
  69   if (TREE_CODE (decl) != VAR_DECL
  70       && TREE_CODE (decl) != FUNCTION_DECL)
  71     return 0;
  72   imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
  73   if (imp)
  74     return 1;
  75
  76   return 0;
  77 }
  78
  79 /* Return nonzero if SYMBOL is marked as being dllexport'd.  */
  80
  81 int
  82 arm_dllexport_name_p (symbol)
  83      const char * symbol;
  84 {
  85   return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.';
  86 }
  87
  88 /* Return nonzero if SYMBOL is marked as being dllimport'd.  */
  89
  90 int
  91 arm_dllimport_name_p (symbol)
  92      const char * symbol;
  93 {
  94   return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.';
  95 }
  96
  97 /* Mark a DECL as being dllexport'd.
  98    Note that we override the previous setting (eg: dllimport).  */
  99
 100 void
 101 arm_mark_dllexport (decl)
 102      tree decl;
 103 {
 104   const char * oldname;
 105   char * newname;
 106   rtx rtlname;
 107   tree idp;
 108
 109   rtlname = XEXP (DECL_RTL (decl), 0);
 110   if (GET_CODE (rtlname) == SYMBOL_REF)
 111     oldname = XSTR (rtlname, 0);
 112   else if (GET_CODE (rtlname) == MEM
 113            && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
 114     oldname = XSTR (XEXP (rtlname, 0), 0);
 115   else
 116     abort ();
 117   if (arm_dllimport_name_p (oldname))
 118     oldname += 9;
 119   else if (arm_dllexport_name_p (oldname))
 120     return; /* already done */
 121
 122   newname = alloca (strlen (oldname) + 4);
 123   sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, oldname);
 124
 125   /* We pass newname through get_identifier to ensure it has a unique
 126      address.  RTL processing can sometimes peek inside the symbol ref
 127      and compare the string's addresses to see if two symbols are
 128      identical.  */
 129   /* ??? At least I think that's why we do this.  */
 130   idp = get_identifier (newname);
 131
 132   XEXP (DECL_RTL (decl), 0) =
 133     gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
 134 }
 135
 136 /* Mark a DECL as being dllimport'd.  */
 137
 138 void
 139 arm_mark_dllimport (decl)
 140      tree decl;
 141 {
 142   const char * oldname;
 143   char * newname;
 144   tree idp;
 145   rtx rtlname, newrtl;
 146
 147   rtlname = XEXP (DECL_RTL (decl), 0);
 148
 149   if (GET_CODE (rtlname) == SYMBOL_REF)
 150     oldname = XSTR (rtlname, 0);
 151   else if (GET_CODE (rtlname) == MEM
 152            && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
 153     oldname = XSTR (XEXP (rtlname, 0), 0);
 154   else
 155     abort ();
 156
 157   if (arm_dllexport_name_p (oldname))
 158     abort (); /* this shouldn't happen */
 159   else if (arm_dllimport_name_p (oldname))
 160     return; /* already done */
 161
 162   /* ??? One can well ask why we're making these checks here,
 163      and that would be a good question.  */
 164
 165   /* Imported variables can't be initialized.  */
 166   if (TREE_CODE (decl) == VAR_DECL
 167       && !DECL_VIRTUAL_P (decl)
 168       && DECL_INITIAL (decl))
 169     {
 170       error_with_decl (decl, "initialized variable `%s' is marked dllimport");
 171       return;
 172     }
 173   /* Nor can they be static.  */
 174   if (TREE_CODE (decl) == VAR_DECL
 175       /* ??? Is this test for vtables needed?  */
 176       && !DECL_VIRTUAL_P (decl)
 177       && 0 /*???*/)
 178     {
 179       error_with_decl (decl, "static variable `%s' is marked dllimport");
 180       return;
 181     }
 182
 183   /* `extern' needn't be specified with dllimport.
 184      Specify `extern' now and hope for the best.  Sigh.  */
 185   if (TREE_CODE (decl) == VAR_DECL
 186       /* ??? Is this test for vtables needed?  */
 187       && !DECL_VIRTUAL_P (decl))
 188     {
 189       DECL_EXTERNAL (decl) = 1;
 190       TREE_PUBLIC (decl) = 1;
 191     }
 192
 193   newname = alloca (strlen (oldname) + 11);
 194   sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, oldname);
 195
 196   /* We pass newname through get_identifier to ensure it has a unique
 197      address.  RTL processing can sometimes peek inside the symbol ref
 198      and compare the string's addresses to see if two symbols are
 199      identical.  */
 200   /* ??? At least I think that's why we do this.  */
 201   idp = get_identifier (newname);
 202
 203   newrtl = gen_rtx (MEM, Pmode,
 204                     gen_rtx (SYMBOL_REF, Pmode,
 205                              IDENTIFIER_POINTER (idp)));
 206   XEXP (DECL_RTL (decl), 0) = newrtl;
 207 }
 208
 209 void
 210 arm_pe_encode_section_info (decl, first)
 211      tree decl;
 212      int first ATTRIBUTE_UNUSED;
 213 {
 214   /* This bit is copied from arm_encode_section_info.  */
 215   if (optimize > 0 && TREE_CONSTANT (decl)
 216       && (!flag_writable_strings || TREE_CODE (decl) != STRING_CST))
 217     {
 218       rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd'
 219                  ? TREE_CST_RTL (decl) : DECL_RTL (decl));
 220       SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
 221     }
 222
 223   /* Mark the decl so we can tell from the rtl whether the object is
 224      dllexport'd or dllimport'd.  */
 225   if (arm_dllexport_p (decl))
 226     arm_mark_dllexport (decl);
 227   else if (arm_dllimport_p (decl))
 228     arm_mark_dllimport (decl);
 229   /* It might be that DECL has already been marked as dllimport, but a
 230      subsequent definition nullified that.  The attribute is gone but
 231      DECL_RTL still has @i.__imp_foo.  We need to remove that.  */
 232   else if ((TREE_CODE (decl) == FUNCTION_DECL
 233             || TREE_CODE (decl) == VAR_DECL)
 234            && DECL_RTL (decl) != NULL_RTX
 235            && GET_CODE (DECL_RTL (decl)) == MEM
 236            && GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
 237            && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
 238            && arm_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
 239     {
 240       const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
 241       tree idp = get_identifier (oldname + 9);
 242       rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
 243
 244       XEXP (DECL_RTL (decl), 0) = newrtl;
 245
 246       /* We previously set TREE_PUBLIC and DECL_EXTERNAL.
 247          ??? We leave these alone for now.  */
 248     }
 249 }
 250
 251 void
 252 arm_pe_unique_section (decl, reloc)
 253      tree decl;
 254      int reloc;
 255 {
 256   int len;
 257   const char * name;
 258   char * string;
 259   const char * prefix;
 260
 261   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
 262   name = arm_strip_name_encoding (name);
 263
 264   /* The object is put in, for example, section .text$foo.
 265      The linker will then ultimately place them in .text
 266      (everything from the $ on is stripped).  */
 267   if (TREE_CODE (decl) == FUNCTION_DECL)
 268     prefix = ".text$";
 269   else if (decl_readonly_section (decl, reloc))
 270     prefix = ".rdata$";
 271   else
 272     prefix = ".data$";
 273   len = strlen (name) + strlen (prefix);
 274   string = alloca (len + 1);
 275   sprintf (string, "%s%s", prefix, name);
 276
 277   DECL_SECTION_NAME (decl) = build_string (len, string);
 278 }