pe.c revision 90075
1/* Routines for GCC for ARM/pe. 2 Copyright (C) 1995, 1996, 2000, 2001 Free Software Foundation, Inc. 3 Contributed by Doug Evans (dje@cygnus.com). 4 5This file is part of GNU CC. 6 7GNU CC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU CC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU CC; see the file COPYING. If not, write to 19the Free Software Foundation, 59 Temple Place - Suite 330, 20Boston, MA 02111-1307, USA. */ 21 22#include "config.h" 23#include "system.h" 24#include "rtl.h" 25#include "output.h" 26#include "flags.h" 27#include "tree.h" 28#include "expr.h" 29#include "toplev.h" 30#include "tm_p.h" 31 32extern int current_function_anonymous_args; 33 34 35/* Return non-zero if DECL is a dllexport'd object. */ 36 37tree current_class_type; /* FIXME */ 38 39int 40arm_dllexport_p (decl) 41 tree decl; 42{ 43 tree exp; 44 45 if (TREE_CODE (decl) != VAR_DECL 46 && TREE_CODE (decl) != FUNCTION_DECL) 47 return 0; 48 exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)); 49 if (exp) 50 return 1; 51 52 return 0; 53} 54 55/* Return non-zero if DECL is a dllimport'd object. */ 56 57int 58arm_dllimport_p (decl) 59 tree decl; 60{ 61 tree imp; 62 63 if (TREE_CODE (decl) == FUNCTION_DECL 64 && TARGET_NOP_FUN_DLLIMPORT) 65 return 0; 66 67 if (TREE_CODE (decl) != VAR_DECL 68 && TREE_CODE (decl) != FUNCTION_DECL) 69 return 0; 70 imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl)); 71 if (imp) 72 return 1; 73 74 return 0; 75} 76 77/* Return non-zero if SYMBOL is marked as being dllexport'd. */ 78 79int 80arm_dllexport_name_p (symbol) 81 const char * symbol; 82{ 83 return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.'; 84} 85 86/* Return non-zero if SYMBOL is marked as being dllimport'd. */ 87 88int 89arm_dllimport_name_p (symbol) 90 const char * symbol; 91{ 92 return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.'; 93} 94 95/* Mark a DECL as being dllexport'd. 96 Note that we override the previous setting (eg: dllimport). */ 97 98void 99arm_mark_dllexport (decl) 100 tree decl; 101{ 102 const char * oldname; 103 char * newname; 104 rtx rtlname; 105 tree idp; 106 107 rtlname = XEXP (DECL_RTL (decl), 0); 108 if (GET_CODE (rtlname) == SYMBOL_REF) 109 oldname = XSTR (rtlname, 0); 110 else if (GET_CODE (rtlname) == MEM 111 && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF) 112 oldname = XSTR (XEXP (rtlname, 0), 0); 113 else 114 abort (); 115 if (arm_dllimport_name_p (oldname)) 116 oldname += 9; 117 else if (arm_dllexport_name_p (oldname)) 118 return; /* already done */ 119 120 newname = alloca (strlen (oldname) + 4); 121 sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, oldname); 122 123 /* We pass newname through get_identifier to ensure it has a unique 124 address. RTL processing can sometimes peek inside the symbol ref 125 and compare the string's addresses to see if two symbols are 126 identical. */ 127 /* ??? At least I think that's why we do this. */ 128 idp = get_identifier (newname); 129 130 XEXP (DECL_RTL (decl), 0) = 131 gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp)); 132} 133 134/* Mark a DECL as being dllimport'd. */ 135 136void 137arm_mark_dllimport (decl) 138 tree decl; 139{ 140 const char * oldname; 141 char * newname; 142 tree idp; 143 rtx rtlname, newrtl; 144 145 rtlname = XEXP (DECL_RTL (decl), 0); 146 147 if (GET_CODE (rtlname) == SYMBOL_REF) 148 oldname = XSTR (rtlname, 0); 149 else if (GET_CODE (rtlname) == MEM 150 && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF) 151 oldname = XSTR (XEXP (rtlname, 0), 0); 152 else 153 abort (); 154 155 if (arm_dllexport_name_p (oldname)) 156 abort (); /* this shouldn't happen */ 157 else if (arm_dllimport_name_p (oldname)) 158 return; /* already done */ 159 160 /* ??? One can well ask why we're making these checks here, 161 and that would be a good question. */ 162 163 /* Imported variables can't be initialized. */ 164 if (TREE_CODE (decl) == VAR_DECL 165 && !DECL_VIRTUAL_P (decl) 166 && DECL_INITIAL (decl)) 167 { 168 error_with_decl (decl, "initialized variable `%s' is marked dllimport"); 169 return; 170 } 171 /* Nor can they be static. */ 172 if (TREE_CODE (decl) == VAR_DECL 173 /* ??? Is this test for vtables needed? */ 174 && !DECL_VIRTUAL_P (decl) 175 && 0 /*???*/) 176 { 177 error_with_decl (decl, "static variable `%s' is marked dllimport"); 178 return; 179 } 180 181 /* `extern' needn't be specified with dllimport. 182 Specify `extern' now and hope for the best. Sigh. */ 183 if (TREE_CODE (decl) == VAR_DECL 184 /* ??? Is this test for vtables needed? */ 185 && !DECL_VIRTUAL_P (decl)) 186 { 187 DECL_EXTERNAL (decl) = 1; 188 TREE_PUBLIC (decl) = 1; 189 } 190 191 newname = alloca (strlen (oldname) + 11); 192 sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, oldname); 193 194 /* We pass newname through get_identifier to ensure it has a unique 195 address. RTL processing can sometimes peek inside the symbol ref 196 and compare the string's addresses to see if two symbols are 197 identical. */ 198 /* ??? At least I think that's why we do this. */ 199 idp = get_identifier (newname); 200 201 newrtl = gen_rtx (MEM, Pmode, 202 gen_rtx (SYMBOL_REF, Pmode, 203 IDENTIFIER_POINTER (idp))); 204 XEXP (DECL_RTL (decl), 0) = newrtl; 205} 206 207/* Cover function to implement ENCODE_SECTION_INFO. */ 208 209void 210arm_pe_encode_section_info (decl) 211 tree decl; 212{ 213 /* This bit is copied from arm.h. */ 214 if (optimize > 0 && TREE_CONSTANT (decl) 215 && (!flag_writable_strings || TREE_CODE (decl) != STRING_CST)) 216 { 217 rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd' 218 ? TREE_CST_RTL (decl) : DECL_RTL (decl)); 219 SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; 220 } 221 222 /* Mark the decl so we can tell from the rtl whether the object is 223 dllexport'd or dllimport'd. */ 224 if (arm_dllexport_p (decl)) 225 arm_mark_dllexport (decl); 226 else if (arm_dllimport_p (decl)) 227 arm_mark_dllimport (decl); 228 /* It might be that DECL has already been marked as dllimport, but a 229 subsequent definition nullified that. The attribute is gone but 230 DECL_RTL still has @i.__imp_foo. We need to remove that. */ 231 else if ((TREE_CODE (decl) == FUNCTION_DECL 232 || TREE_CODE (decl) == VAR_DECL) 233 && DECL_RTL (decl) != NULL_RTX 234 && GET_CODE (DECL_RTL (decl)) == MEM 235 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM 236 && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF 237 && arm_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0))) 238 { 239 const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0); 240 tree idp = get_identifier (oldname + 9); 241 rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp)); 242 243 XEXP (DECL_RTL (decl), 0) = newrtl; 244 245 /* We previously set TREE_PUBLIC and DECL_EXTERNAL. 246 ??? We leave these alone for now. */ 247 } 248} 249 250/* Cover function for UNIQUE_SECTION. */ 251 252void 253arm_pe_unique_section (decl, reloc) 254 tree decl; 255 int reloc; 256{ 257 int len; 258 const char * name; 259 char * string; 260 const char * prefix; 261 262 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); 263 /* Strip off any encoding in fnname. */ 264 STRIP_NAME_ENCODING (name, name); 265 266 /* The object is put in, for example, section .text$foo. 267 The linker will then ultimately place them in .text 268 (everything from the $ on is stripped). */ 269 if (TREE_CODE (decl) == FUNCTION_DECL) 270 prefix = ".text$"; 271 else if (DECL_READONLY_SECTION (decl, reloc)) 272 prefix = ".rdata$"; 273 else 274 prefix = ".data$"; 275 len = strlen (name) + strlen (prefix); 276 string = alloca (len + 1); 277 sprintf (string, "%s%s", prefix, name); 278 279 DECL_SECTION_NAME (decl) = build_string (len, string); 280} 281