1 /* General Solaris system support. 2 Copyright (C) 2004-2015 Free Software Foundation, Inc. 3 Contributed by CodeSourcery, LLC. 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 "hash-set.h" 25 #include "machmode.h" 26 #include "vec.h" 27 #include "double-int.h" 28 #include "input.h" 29 #include "alias.h" 30 #include "symtab.h" 31 #include "options.h" 32 #include "wide-int.h" 33 #include "inchash.h" 34 #include "tree.h" 35 #include "stringpool.h" 36 #include "varasm.h" 37 #include "output.h" 38 #include "tm.h" 39 #include "rtl.h" 40 #include "target.h" 41 #include "tm_p.h" 42 #include "diagnostic-core.h" 43 #include "ggc.h" 44 #include "hash-table.h" 45 46 tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis; 47 48 /* Attach any pending attributes for DECL to the list in *ATTRIBUTES. 49 Pending attributes come from #pragma or _Pragma, so this code is 50 only useful in the C family front ends, but it is included in 51 all languages to avoid changing the target machine initializer 52 depending on the language. */ 53 54 void 55 solaris_insert_attributes (tree decl, tree *attributes) 56 { 57 tree *x, next; 58 59 if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL) 60 for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x)) 61 { 62 tree name = TREE_PURPOSE (*x); 63 tree value = TREE_VALUE (*x); 64 if (DECL_NAME (decl) == name) 65 { 66 if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl)) 67 || lookup_attribute ("aligned", *attributes)) 68 warning (0, "ignoring %<#pragma align%> for explicitly " 69 "aligned %q+D", decl); 70 else 71 *attributes = tree_cons (get_identifier ("aligned"), value, 72 *attributes); 73 next = TREE_CHAIN (*x); 74 ggc_free (*x); 75 *x = next; 76 break; 77 } 78 } 79 80 if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL) 81 for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x)) 82 { 83 tree name = TREE_PURPOSE (*x); 84 if (DECL_NAME (decl) == name) 85 { 86 *attributes = tree_cons (get_identifier ("init"), NULL, 87 *attributes); 88 TREE_USED (decl) = 1; 89 DECL_PRESERVE_P (decl) = 1; 90 next = TREE_CHAIN (*x); 91 ggc_free (*x); 92 *x = next; 93 break; 94 } 95 } 96 97 if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL) 98 for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x)) 99 { 100 tree name = TREE_PURPOSE (*x); 101 if (DECL_NAME (decl) == name) 102 { 103 *attributes = tree_cons (get_identifier ("fini"), NULL, 104 *attributes); 105 TREE_USED (decl) = 1; 106 DECL_PRESERVE_P (decl) = 1; 107 next = TREE_CHAIN (*x); 108 ggc_free (*x); 109 *x = next; 110 break; 111 } 112 } 113 } 114 115 /* Output initializer or finalizer entries for DECL to FILE. */ 116 117 void 118 solaris_output_init_fini (FILE *file, tree decl) 119 { 120 if (lookup_attribute ("init", DECL_ATTRIBUTES (decl))) 121 { 122 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init"); 123 ASM_OUTPUT_CALL (file, decl); 124 fprintf (file, "\t.popsection\n"); 125 } 126 127 if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl))) 128 { 129 fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini"); 130 ASM_OUTPUT_CALL (file, decl); 131 fprintf (file, "\t.popsection\n"); 132 } 133 } 134 135 /* Emit an assembler directive to set symbol for DECL visibility to 136 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */ 137 138 void 139 solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED) 140 { 141 #ifdef HAVE_GAS_HIDDEN 142 /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as 143 `currently reserved', but the linker treats it like STV_HIDDEN. Sun 144 Studio 12.1 cc emits .hidden instead. 145 146 There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED, 147 STV_SINGLETON, and STV_ELIMINATE. 148 149 See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining 150 Additional Symbols, and Ch. 7, Object-File Format, Symbol Table 151 Section. */ 152 153 static const char * const visibility_types[] = { 154 NULL, "symbolic", "hidden", "hidden" 155 }; 156 157 const char *name, *type; 158 tree id = DECL_ASSEMBLER_NAME (decl); 159 160 while (IDENTIFIER_TRANSPARENT_ALIAS (id)) 161 id = TREE_CHAIN (id); 162 name = IDENTIFIER_POINTER (id); 163 type = visibility_types[vis]; 164 165 fprintf (asm_out_file, "\t.%s\t", type); 166 assemble_name (asm_out_file, name); 167 fprintf (asm_out_file, "\n"); 168 #else 169 if (!DECL_ARTIFICIAL (decl)) 170 warning (OPT_Wattributes, "visibility attribute not supported " 171 "in this configuration; ignored"); 172 #endif 173 } 174 175 /* Group section information entry stored in solaris_comdat_htab. */ 176 177 typedef struct comdat_entry 178 { 179 const char *name; 180 unsigned int flags; 181 tree decl; 182 const char *sig; 183 } comdat_entry; 184 185 /* Helpers for maintaining solaris_comdat_htab. */ 186 187 struct comdat_entry_hasher : typed_noop_remove <comdat_entry> 188 { 189 typedef comdat_entry value_type; 190 typedef comdat_entry compare_type; 191 static inline hashval_t hash (const value_type *); 192 static inline bool equal (const value_type *, const compare_type *); 193 static inline void remove (value_type *); 194 }; 195 196 inline hashval_t 197 comdat_entry_hasher::hash (const value_type *entry) 198 { 199 return htab_hash_string (entry->sig); 200 } 201 202 inline bool 203 comdat_entry_hasher::equal (const value_type *entry1, 204 const compare_type *entry2) 205 { 206 return strcmp (entry1->sig, entry2->sig) == 0; 207 } 208 209 /* Hash table of group signature symbols. */ 210 211 static hash_table<comdat_entry_hasher> *solaris_comdat_htab; 212 213 /* Output assembly to switch to COMDAT group section NAME with attributes 214 FLAGS and group signature symbol DECL, using Sun as syntax. */ 215 216 void 217 solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl) 218 { 219 const char *signature; 220 char *section; 221 comdat_entry entry, **slot; 222 223 if (TREE_CODE (decl) == IDENTIFIER_NODE) 224 signature = IDENTIFIER_POINTER (decl); 225 else 226 signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)); 227 228 /* Sun as requires group sections to be fragmented, i.e. to have names of 229 the form <section>%<fragment>. Strictly speaking this is only 230 necessary to support cc -xF, but is enforced globally in violation of 231 the ELF gABI. We keep the section names generated by GCC (generally 232 of the form .text.<signature>) and append %<signature> to pacify as, 233 despite the redundancy. */ 234 section = concat (name, "%", signature, NULL); 235 236 /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only 237 emits this as a regular section. Emit section before .group 238 directive since Sun as treats undeclared sections as @progbits, 239 which conflicts with .bss* sections which are @nobits. */ 240 targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl); 241 242 /* Sun as separates declaration of a group section and of the group 243 itself, using the .group directive and the #comdat flag. */ 244 fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n", 245 signature, section); 246 247 /* Unlike GNU as, group signature symbols need to be defined explicitly 248 for Sun as. With a few exceptions, this is already the case. To 249 identify the missing ones without changing the affected frontents, 250 remember the signature symbols and emit those not marked 251 TREE_SYMBOL_REFERENCED in solaris_file_end. */ 252 if (!solaris_comdat_htab) 253 solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37); 254 255 entry.sig = signature; 256 slot = solaris_comdat_htab->find_slot (&entry, INSERT); 257 258 if (*slot == NULL) 259 { 260 *slot = XCNEW (comdat_entry); 261 /* Remember fragmented section name. */ 262 (*slot)->name = section; 263 /* Emit as regular section, .group declaration has already been done. */ 264 (*slot)->flags = flags & ~SECTION_LINKONCE; 265 (*slot)->decl = decl; 266 (*slot)->sig = signature; 267 } 268 } 269 270 /* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */ 271 272 int 273 solaris_define_comdat_signature (comdat_entry **slot, 274 void *aux ATTRIBUTE_UNUSED) 275 { 276 comdat_entry *entry = *slot; 277 tree decl = entry->decl; 278 279 if (TREE_CODE (decl) != IDENTIFIER_NODE) 280 decl = DECL_COMDAT_GROUP (decl); 281 282 if (!TREE_SYMBOL_REFERENCED (decl)) 283 { 284 /* Switch to group section, otherwise Sun as complains 285 `Group Id symbol defined outside of group'. */ 286 switch_to_section (get_section (entry->name, entry->flags, entry->decl)); 287 288 ASM_OUTPUT_LABEL (asm_out_file, entry->sig); 289 } 290 291 /* Continue with scan. */ 292 return 1; 293 } 294 295 /* Emit unreferenced COMDAT group signature symbols for Sun as. */ 296 297 void 298 solaris_file_end (void) 299 { 300 if (!solaris_comdat_htab) 301 return; 302 303 solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature> 304 (NULL); 305 } 306 307 void 308 solaris_override_options (void) 309 { 310 /* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame. 311 Don't emit DWARF3/4 unless specifically selected if so. */ 312 if (!HAVE_LD_EH_FRAME_CIEV3 && !global_options_set.x_dwarf_version) 313 dwarf_version = 2; 314 } 315