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 35extern int current_function_anonymous_args; 36 37 38/* Return nonzero if DECL is a dllexport'd object. */ 39 40tree current_class_type; /* FIXME */ 41 42int 43arm_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 60int 61arm_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 82int 83arm_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 91int 92arm_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 101void 102arm_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 137void 138arm_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 204void 205arm_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 242void 243arm_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} 270