nsz Git - libfirm/blob - ir/be/begnuas.c

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief       Dumps global variables and constants as gas assembler.
  23  * @author      Christian Wuerdig, Matthias Braun
  24  * @date        04.11.2005
  25  * @version     $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "begnuas.h"
  32
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <ctype.h>
  36 #include <assert.h>
  37
  38 #include "obst.h"
  39 #include "tv.h"
  40 #include "irnode.h"
  41 #include "irprog.h"
  42 #include "pdeq.h"
  43 #include "entity_t.h"
  44 #include "error.h"
  45
  46 #include "be_t.h"
  47 #include "beemitter.h"
  48 #include "be_dbgout.h"
  49
  50 /** by default, we generate assembler code for the Linux gas */
  51 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_ELF;
  52
  53 static be_gas_section_t current_section = (be_gas_section_t) -1;
  54
  55 /**
  56  * Return the pseudo-instruction to be issued for a section switch
  57  * depending on the current flavour.
  58  *
  59  * @param section  the section to switch to
  60  *
  61  * @return  the pseudo-instruction
  62  */
  63 static const char *get_section_name(be_gas_section_t section) {
  64         static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
  65                 { /* GAS_FLAVOUR_ELF */
  66                         ".section\t.text",
  67                         ".section\t.data",
  68                         ".section\t.rodata",
  69                         ".section\t.bss",
  70                         ".section\t.tbss,\"awT\",@nobits",
  71                         ".section\t.ctors,\"aw\",@progbits",
  72                         ".section\t.dtors,\"aw\",@progbits",
  73                         NULL, /* no cstring section */
  74                         NULL,
  75                         NULL
  76                 },
  77                 { /* GAS_FLAVOUR_MINGW */
  78                         ".section\t.text",
  79                         ".section\t.data",
  80                         ".section .rdata,\"dr\"",
  81                         ".section\t.bss",
  82                         ".section\t.tbss,\"awT\",@nobits",
  83                         ".section\t.ctors,\"aw\",@progbits",
  84                         ".section\t.dtors,\"aw\",@progbits",
  85                         NULL,
  86                         NULL,
  87                         NULL
  88                 },
  89                 { /* GAS_FLAVOUR_YASM */
  90                         ".section\t.text",
  91                         ".section\t.data",
  92                         ".section\t.rodata",
  93                         ".section\t.bss",
  94                         ".section\t.tbss,\"awT\",@nobits",
  95                         ".section\t.ctors,\"aw\",@progbits",
  96                         ".section\t.dtors,\"aw\",@progbits",
  97                         NULL,
  98                         NULL,
  99                         NULL
 100                 },
 101                 { /* GAS_FLAVOUR_MACH_O */
 102                         ".text",
 103                         ".data",
 104                         ".const",
 105                         ".data",
 106                         NULL,             /* TLS is not supported on Mach-O */
 107                         ".mod_init_func",
 108                         NULL,             /* TODO: how is this called? */
 109                         ".cstring",
 110                         ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
 111                         ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
 112                 }
 113         };
 114
 115         assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
 116         assert((int) section >= 0 && section <= GAS_SECTION_LAST);
 117         return text[be_gas_flavour][section];
 118 }
 119
 120 void be_gas_emit_switch_section(be_gas_section_t section) {
 121         if(current_section == section)
 122                 return;
 123
 124         be_emit_char('\t');
 125         be_emit_string(get_section_name(section));
 126         be_emit_char('\n');
 127         be_emit_write_line();
 128         current_section = section;
 129 }
 130
 131 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
 132 {
 133         const char *name = get_entity_ld_name(entity);
 134         const char *fill_byte = "";
 135         unsigned maximum_skip;
 136
 137         be_gas_emit_switch_section(GAS_SECTION_TEXT);
 138
 139         /* write the begin line (used by scripts processing the assembler... */
 140         be_emit_write_line();
 141         be_emit_cstring("# -- Begin  ");
 142         be_emit_string(name);
 143         be_emit_char('\n');
 144         be_emit_write_line();
 145
 146         /* gcc fills space between function with 0x90, no idea if this is needed */
 147         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 148                 fill_byte = "0x90";
 149         }
 150
 151         if (alignment > 0) {
 152                 maximum_skip = (1 << alignment) - 1;
 153                 be_emit_cstring("\t.p2align ");
 154                 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
 155                 be_emit_write_line();
 156         }
 157         if (get_entity_visibility(entity) == visibility_external_visible) {
 158                 be_emit_cstring(".globl ");
 159                 be_emit_string(name);
 160                 be_emit_char('\n');
 161                 be_emit_write_line();
 162         }
 163
 164         switch (be_gas_flavour) {
 165         case GAS_FLAVOUR_ELF:
 166                 be_emit_cstring("\t.type\t");
 167                 be_emit_string(name);
 168                 be_emit_cstring(", @function\n");
 169                 be_emit_write_line();
 170                 break;
 171         case GAS_FLAVOUR_MINGW:
 172                 be_emit_cstring("\t.def\t");
 173                 be_emit_string(name);
 174                 if (get_entity_visibility(entity) == visibility_external_visible) {
 175                         be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
 176                 } else {
 177                         be_emit_cstring(";\t.scl\t3;\t.type\t32;\t.endef\n");
 178                 }
 179                 be_emit_write_line();
 180                 break;
 181         case GAS_FLAVOUR_MACH_O:
 182         case GAS_FLAVOUR_YASM:
 183                 break;
 184         }
 185         be_emit_string(name);
 186         be_emit_cstring(":\n");
 187         be_emit_write_line();
 188 }
 189
 190 void be_gas_emit_function_epilog(ir_entity *entity)
 191 {
 192         const char *name = get_entity_ld_name(entity);
 193
 194         if (be_gas_flavour == GAS_FLAVOUR_ELF) {
 195                 be_emit_cstring("\t.size\t");
 196                 be_emit_string(name);
 197                 be_emit_cstring(", .-");
 198                 be_emit_string(name);
 199                 be_emit_char('\n');
 200                 be_emit_write_line();
 201         }
 202
 203         be_emit_cstring("# -- End  ");
 204         be_emit_string(name);
 205         be_emit_char('\n');
 206         be_emit_write_line();
 207 }
 208
 209 /**
 210  * An environment containing all needed dumper data.
 211  * Currently we create the file completely in memory first, then
 212  * write it to the disk. This is an artifact from the old C-generating backend
 213  * and even there NOT needed. So we might change it in the future.
 214  */
 215 typedef struct _be_gas_decl_env {
 216         const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
 217         be_gas_section_t     section;
 218         waitq               *worklist;           /**< A worklist we use to place not yet handled entities on. */
 219 } be_gas_decl_env_t;
 220
 221 /************************************************************************/
 222
 223 /**
 224  * Output a tarval.
 225  *
 226  * @param tv     the tarval
 227  * @param bytes  the width of the tarvals value in bytes
 228  */
 229 static void dump_arith_tarval(tarval *tv, int bytes)
 230 {
 231         switch (bytes) {
 232         case 1:
 233                 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
 234                 return;
 235
 236         case 2:
 237                 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 238                 return;
 239
 240         case 4:
 241                 be_emit_irprintf("0x%02x%02x%02x%02x",
 242                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 243                 return;
 244
 245         case 8:
 246                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
 247                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 248                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 249                 return;
 250
 251         case 12:
 252                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
 253                                    "%02x%02x%02x%02x", get_tarval_sub_bits(tv, 11),
 254                                 get_tarval_sub_bits(tv, 10), get_tarval_sub_bits(tv, 9),
 255                                 get_tarval_sub_bits(tv, 8), get_tarval_sub_bits(tv, 7),
 256                                 get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5),
 257                                 get_tarval_sub_bits(tv, 4), get_tarval_sub_bits(tv, 3),
 258                                 get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1),
 259                                 get_tarval_sub_bits(tv, 0));
 260                 return;
 261
 262         case 16:
 263                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
 264                                                "%02x%02x%02x%02x%02x%02x%02x%02x",
 265                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 266                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 267                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 268                         get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
 269                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
 270                         get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 271                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
 272                         get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 273                 return;
 274         }
 275
 276         panic("Can't dump a tarval with %d bytes", bytes);
 277 }
 278
 279 /**
 280  * Return the label prefix for labeled blocks.
 281  */
 282 const char *be_gas_block_label_prefix(void) {
 283         return ".LG";
 284 }
 285
 286 /**
 287  * Return the label prefix for labeled instructions.
 288  */
 289 const char *be_gas_insn_label_prefix(void) {
 290         return ".LE";
 291 }
 292
 293 /**
 294  * Dump a label.
 295  */
 296 static void dump_label(ir_label_t label) {
 297         be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
 298 }
 299
 300 /**
 301  * Return the tarval of an atomic initializer.
 302  *
 303  * @param init  a node representing the initializer (on the const code irg)
 304  *
 305  * @return the tarval
 306  */
 307 static tarval *get_atomic_init_tv(ir_node *init)
 308 {
 309         for (;;) {
 310                 ir_mode *mode = get_irn_mode(init);
 311
 312                 switch (get_irn_opcode(init)) {
 313
 314                 case iro_Cast:
 315                         init = get_Cast_op(init);
 316                         continue;
 317
 318                 case iro_Conv:
 319                         init = get_Conv_op(init);
 320                         continue;
 321
 322                 case iro_Const:
 323                         return get_Const_tarval(init);
 324
 325                 case iro_SymConst:
 326                         switch (get_SymConst_kind(init)) {
 327                         case symconst_type_size:
 328                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 329
 330                         case symconst_type_align:
 331                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 332
 333                         case symconst_ofs_ent:
 334                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 335
 336                         case symconst_enum_const:
 337                                 return get_enumeration_value(get_SymConst_enum(init));
 338
 339                         case symconst_label:
 340                                 return NULL;
 341
 342                         default:
 343                                 return NULL;
 344                         }
 345
 346                 default:
 347                         return NULL;
 348                 }
 349         }
 350 }
 351
 352 /**
 353  * Dump an atomic value.
 354  *
 355  * @param env   the gas output environment
 356  * @param init  a node representing the atomic value (on the const code irg)
 357  */
 358 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 359 {
 360         ir_mode *mode = get_irn_mode(init);
 361         int bytes     = get_mode_size_bytes(mode);
 362         tarval *tv;
 363         ir_label_t label;
 364         ir_entity *ent;
 365
 366         init = skip_Id(init);
 367
 368         switch (get_irn_opcode(init)) {
 369         case iro_Cast:
 370                 do_dump_atomic_init(env, get_Cast_op(init));
 371                 return;
 372
 373         case iro_Conv:
 374                 do_dump_atomic_init(env, get_Conv_op(init));
 375                 return;
 376
 377         case iro_Const:
 378                 tv = get_Const_tarval(init);
 379
 380                 /* it's a arithmetic value */
 381                 dump_arith_tarval(tv, bytes);
 382                 return;
 383
 384         case iro_SymConst:
 385                 switch (get_SymConst_kind(init)) {
 386                 case symconst_addr_name:
 387                         be_emit_ident(get_SymConst_name(init));
 388                         break;
 389
 390                 case symconst_addr_ent:
 391                         ent = get_SymConst_entity(init);
 392                         if(!is_entity_backend_marked(ent)) {
 393                                 waitq_put(env->worklist, ent);
 394                                 set_entity_backend_marked(ent, 1);
 395                         }
 396                         be_emit_ident(get_entity_ld_ident(ent));
 397                         break;
 398
 399                 case symconst_ofs_ent:
 400                         ent = get_SymConst_entity(init);
 401 #if 0       /* not needed, is it? */
 402                         if(!is_entity_backend_marked(ent)) {
 403                                 waitq_put(env->worklist, ent);
 404                                 set_entity_backend_marked(ent, 1);
 405                         }
 406 #endif
 407                         be_emit_irprintf("%d", get_entity_offset(ent));
 408                         break;
 409
 410                 case symconst_type_size:
 411                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 412                         break;
 413
 414                 case symconst_type_align:
 415                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 416                         break;
 417
 418                 case symconst_enum_const:
 419                         tv = get_enumeration_value(get_SymConst_enum(init));
 420                         dump_arith_tarval(tv, bytes);
 421                         break;
 422
 423                 case symconst_label:
 424                         label = get_SymConst_label(init);
 425                         dump_label(label);
 426                         break;
 427
 428                 default:
 429                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 430                 }
 431                 return;
 432
 433                 case iro_Add:
 434                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 435                                 panic("Constant must be int or pointer for '+' to work");
 436                         }
 437                         do_dump_atomic_init(env, get_Add_left(init));
 438                         be_emit_cstring(" + ");
 439                         do_dump_atomic_init(env, get_Add_right(init));
 440                         return;
 441
 442                 case iro_Sub:
 443                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 444                                 panic("Constant must be int or pointer for '-' to work");
 445                         }
 446                         do_dump_atomic_init(env, get_Sub_left(init));
 447                         be_emit_cstring(" - ");
 448                         do_dump_atomic_init(env, get_Sub_right(init));
 449                         return;
 450
 451                 case iro_Mul:
 452                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 453                                 panic("Constant must be int or pointer for '*' to work");
 454                         }
 455                         do_dump_atomic_init(env, get_Mul_left(init));
 456                         be_emit_cstring(" * ");
 457                         do_dump_atomic_init(env, get_Mul_right(init));
 458                         return;
 459
 460                 default:
 461                         assert(0 && "dump_atomic_init(): unknown IR-node");
 462         }
 463 }
 464
 465 /**
 466  * Dumps the type for given size (.byte, .long, ...)
 467  *
 468  * @param size  the size in bytes
 469  */
 470 static void dump_size_type(size_t size) {
 471         switch (size) {
 472         case 1:
 473                 be_emit_cstring("\t.byte\t");
 474                 break;
 475
 476         case 2:
 477                 be_emit_cstring("\t.word\t");
 478                 break;
 479
 480         case 4:
 481                 be_emit_cstring("\t.long\t");
 482                 break;
 483
 484         case 8:
 485                 be_emit_cstring("\t.quad\t");
 486                 break;
 487
 488         case 10:
 489         case 12:
 490                 /* handled in arith */
 491                 break;
 492
 493         case 16:
 494                 be_emit_cstring("\t.octa\t");
 495                 break;
 496
 497         default:
 498                 panic("Try to dump a type with %u bytes", (unsigned)size);
 499         }
 500 }
 501
 502 /**
 503  * Emit an atomic value.
 504  *
 505  * @param env   the gas output environment
 506  * @param init  a node representing the atomic value (on the const code irg)
 507  */
 508 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 509 {
 510         ir_mode *mode = get_irn_mode(init);
 511         int bytes     = get_mode_size_bytes(mode);
 512
 513         dump_size_type(bytes);
 514         do_dump_atomic_init(env, init);
 515         be_emit_char('\n');
 516         be_emit_write_line();
 517 }
 518
 519 /************************************************************************/
 520 /* Routines to dump global variables                                    */
 521 /************************************************************************/
 522
 523 static int initializer_is_string_const(const ir_initializer_t *initializer)
 524 {
 525         size_t i, len;
 526         int found_printable = 0;
 527
 528         if(initializer->kind != IR_INITIALIZER_COMPOUND)
 529                 return 0;
 530
 531         len = initializer->compound.n_initializers;
 532         if (len < 1)
 533                 return 0;
 534         for(i = 0; i < len; ++i) {
 535                 int               c;
 536                 tarval           *tv;
 537                 ir_mode          *mode;
 538                 ir_initializer_t *sub_initializer
 539                         = initializer->compound.initializers[i];
 540
 541                 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
 542                         return 0;
 543
 544                 tv   = sub_initializer->tarval.value;
 545                 mode = get_tarval_mode(tv);
 546
 547                 if (!mode_is_int(mode)
 548                                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 549                         return 0;
 550
 551                 c = get_tarval_long(tv);
 552                 if (isgraph(c) || isspace(c))
 553                         found_printable = 1;
 554                 else if(c != 0)
 555                         return 0;
 556
 557                 if (i == len - 1 && c != '\0')
 558                         return 0;
 559         }
 560
 561         return found_printable;
 562 }
 563
 564 /**
 565  * Determine if an entity is a string constant
 566  * @param ent The entity
 567  * @return 1 if it is a string constant, 0 otherwise
 568  */
 569 static int ent_is_string_const(ir_entity *ent)
 570 {
 571         ir_type *type, *element_type;
 572         ir_mode *mode;
 573         int i, c, n;
 574         int found_printable = 0;
 575
 576         type = get_entity_type(ent);
 577
 578         /* if it's an array */
 579         if (!is_Array_type(type))
 580                 return 0;
 581
 582         element_type = get_array_element_type(type);
 583
 584         /* and the array's element type is primitive */
 585         if (!is_Primitive_type(element_type))
 586                 return 0;
 587
 588         /* and the mode of the element type is an int of
 589          * the same size as the byte mode */
 590         mode = get_type_mode(element_type);
 591         if (!mode_is_int(mode)
 592                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 593                 return 0;
 594
 595         if(ent->has_initializer) {
 596                 /* TODO */
 597                 return 0;
 598         } else {
 599                 /* if it contains only printable chars and a 0 at the end */
 600                 n = get_compound_ent_n_values(ent);
 601                 for (i = 0; i < n; ++i) {
 602                         ir_node *irn = get_compound_ent_value(ent, i);
 603                         if (! is_Const(irn))
 604                                 return 0;
 605
 606                         c = (int) get_tarval_long(get_Const_tarval(irn));
 607
 608                         if (isgraph(c) || isspace(c))
 609                                 found_printable = 1;
 610                         else if(c != 0)
 611                                 return 0;
 612
 613                         if (i == n - 1 && c != '\0')
 614                                 return 0;
 615                 }
 616         }
 617
 618         /* then we can emit it as a string constant */
 619         return found_printable;
 620 }
 621
 622 /**
 623  * Dump a string constant.
 624  * No checks are made!!
 625  *
 626  * @param ent  The entity to dump.
 627  */
 628 static void dump_string_cst(ir_entity *ent)
 629 {
 630         int      i, len;
 631         ir_type *type;
 632         int      type_size;
 633         int      remaining_space;
 634
 635         len = get_compound_ent_n_values(ent);
 636         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 637                 be_emit_cstring("\t.ascii \"");
 638         } else {
 639                 be_emit_cstring("\t.string \"");
 640                 len -= 1;
 641         }
 642
 643         for (i = 0; i < len; ++i) {
 644                 ir_node *irn;
 645                 int c;
 646
 647                 irn = get_compound_ent_value(ent, i);
 648                 c = (int) get_tarval_long(get_Const_tarval(irn));
 649
 650                 switch (c) {
 651                 case '"' : be_emit_cstring("\\\""); break;
 652                 case '\n': be_emit_cstring("\\n"); break;
 653                 case '\r': be_emit_cstring("\\r"); break;
 654                 case '\t': be_emit_cstring("\\t"); break;
 655                 case '\\': be_emit_cstring("\\\\"); break;
 656                 default  :
 657                         if (isprint(c))
 658                                 be_emit_char(c);
 659                         else
 660                                 be_emit_irprintf("\\%o", c);
 661                         break;
 662                 }
 663         }
 664         be_emit_cstring("\"\n");
 665         be_emit_write_line();
 666
 667         type            = get_entity_type(ent);
 668         type_size       = get_type_size_bytes(type);
 669         remaining_space = type_size - len;
 670         assert(remaining_space >= 0);
 671         if(remaining_space > 0) {
 672                 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
 673         }
 674 }
 675
 676 static void dump_string_initializer(const ir_initializer_t *initializer)
 677 {
 678         size_t i, len;
 679
 680         len = initializer->compound.n_initializers;
 681         if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 682                 be_emit_cstring("\t.ascii \"");
 683         } else {
 684                 be_emit_cstring("\t.string \"");
 685                 len -= 1;
 686         }
 687
 688         for(i = 0; i < len; ++i) {
 689                 const ir_initializer_t *sub_initializer
 690                         = get_initializer_compound_value(initializer, i);
 691
 692                 tarval *tv = get_initializer_tarval_value(sub_initializer);
 693                 int     c  = get_tarval_long(tv);
 694
 695                 switch (c) {
 696                 case '"' : be_emit_cstring("\\\""); break;
 697                 case '\n': be_emit_cstring("\\n"); break;
 698                 case '\r': be_emit_cstring("\\r"); break;
 699                 case '\t': be_emit_cstring("\\t"); break;
 700                 case '\\': be_emit_cstring("\\\\"); break;
 701                 default  :
 702                         if (isprint(c))
 703                                 be_emit_char(c);
 704                         else
 705                                 be_emit_irprintf("\\%o", c);
 706                         break;
 707                 }
 708         }
 709         be_emit_cstring("\"\n");
 710         be_emit_write_line();
 711 }
 712
 713 enum normal_or_bitfield_kind {
 714         NORMAL = 0,
 715         TARVAL,
 716         BITFIELD
 717 };
 718
 719 typedef struct {
 720         enum normal_or_bitfield_kind kind;
 721         union {
 722                 ir_node       *value;
 723                 tarval        *tarval;
 724                 unsigned char  bf_val;
 725         } v;
 726 } normal_or_bitfield;
 727
 728 static int is_type_variable_size(ir_type *type)
 729 {
 730         (void) type;
 731         /* TODO */
 732         return 0;
 733 }
 734
 735 static size_t get_initializer_size(const ir_initializer_t *initializer,
 736                                    ir_type *type)
 737 {
 738         switch(get_initializer_kind(initializer)) {
 739         case IR_INITIALIZER_TARVAL: {
 740                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 741                 return get_type_size_bytes(type);
 742         }
 743         case IR_INITIALIZER_CONST:
 744         case IR_INITIALIZER_NULL:
 745                 return get_type_size_bytes(type);
 746         case IR_INITIALIZER_COMPOUND: {
 747                 if(!is_type_variable_size(type)) {
 748                         return get_type_size_bytes(type);
 749                 } else {
 750                         unsigned n_entries
 751                                 = get_initializer_compound_n_entries(initializer);
 752                         unsigned i;
 753                         unsigned initializer_size = get_type_size_bytes(type);
 754                         for(i = 0; i < n_entries; ++i) {
 755                                 ir_entity *entity = get_compound_member(type, i);
 756                                 ir_type   *type   = get_entity_type(entity);
 757
 758                                 const ir_initializer_t *sub_initializer
 759                                         = get_initializer_compound_value(initializer, i);
 760
 761                                 unsigned offset = get_entity_offset(entity);
 762                                 unsigned size   = get_initializer_size(sub_initializer, type);
 763
 764                                 if(offset + size > initializer_size) {
 765                                         initializer_size = offset + size;
 766                                 }
 767                         }
 768                         return initializer_size;
 769                 }
 770         }
 771         }
 772
 773         panic("found invalid initializer");
 774 }
 775
 776 #ifndef NDEBUG
 777 static normal_or_bitfield *glob_vals;
 778 static size_t              max_vals;
 779 #endif
 780
 781 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
 782                           const ir_initializer_t *initializer, ir_type *type)
 783 {
 784         unsigned char  last_bits = 0;
 785         ir_mode       *mode      = get_type_mode(type);
 786         tarval        *tv        = NULL;
 787         unsigned char  curr_bits;
 788         int            value_len;
 789         int            j;
 790
 791         switch(get_initializer_kind(initializer)) {
 792         case IR_INITIALIZER_NULL:
 793                 return;
 794         case IR_INITIALIZER_TARVAL:
 795                 tv = get_initializer_tarval_value(initializer);
 796                 break;
 797         case IR_INITIALIZER_CONST: {
 798                 ir_node *node = get_initializer_const_value(initializer);
 799                 if(!is_Const(node)) {
 800                         panic("bitfield initializer not a Const node");
 801                 }
 802                 tv = get_Const_tarval(node);
 803                 break;
 804         }
 805         case IR_INITIALIZER_COMPOUND:
 806                 panic("bitfield initializer is compound");
 807         }
 808         if (tv == NULL) {
 809                 panic("Couldn't get numeric value for bitfield initializer");
 810         }
 811
 812         /* normalize offset */
 813         vals        += offset_bits >> 3;
 814         offset_bits &= 7;
 815         value_len    = get_mode_size_bits(mode);
 816
 817         /* combine bits with existing bits */
 818         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 819                 assert((size_t) (vals - glob_vals) + j < max_vals);
 820                 assert(vals[j].kind == BITFIELD ||
 821                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 822                 vals[j].kind = BITFIELD;
 823                 curr_bits    = get_tarval_sub_bits(tv, j);
 824                 vals[j].v.bf_val
 825                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 826                 value_len -= 8;
 827                 last_bits = curr_bits;
 828         }
 829 }
 830
 831 static void dump_ir_initializer(normal_or_bitfield *vals,
 832                                 const ir_initializer_t *initializer,
 833                                 ir_type *type)
 834 {
 835         assert((size_t) (vals - glob_vals) < max_vals);
 836
 837         switch(get_initializer_kind(initializer)) {
 838         case IR_INITIALIZER_NULL:
 839                 return;
 840         case IR_INITIALIZER_TARVAL: {
 841                 size_t i;
 842
 843                 assert(vals->kind != BITFIELD);
 844                 vals->kind     = TARVAL;
 845                 vals->v.tarval = get_initializer_tarval_value(initializer);
 846                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 847                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 848                         vals[i].kind    = NORMAL;
 849                         vals[i].v.value = NULL;
 850                 }
 851                 return;
 852         }
 853         case IR_INITIALIZER_CONST: {
 854                 size_t i;
 855
 856                 assert(vals->kind != BITFIELD);
 857                 vals->kind    = NORMAL;
 858                 vals->v.value = get_initializer_const_value(initializer);
 859                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 860                         vals[i].kind    = NORMAL;
 861                         vals[i].v.value = NULL;
 862                 }
 863                 return;
 864         }
 865         case IR_INITIALIZER_COMPOUND: {
 866                 size_t i = 0;
 867                 size_t n = get_initializer_compound_n_entries(initializer);
 868
 869                 if(is_Array_type(type)) {
 870                         ir_type *element_type = get_array_element_type(type);
 871                         size_t   skip         = get_type_size_bytes(element_type);
 872                         size_t   alignment    = get_type_alignment_bytes(element_type);
 873                         size_t   misalign     = skip % alignment;
 874                         if(misalign != 0) {
 875                                 skip += alignment - misalign;
 876                         }
 877
 878                         for(i = 0; i < n; ++i) {
 879                                 ir_initializer_t *sub_initializer
 880                                         = get_initializer_compound_value(initializer, i);
 881
 882                                 dump_ir_initializer(vals, sub_initializer, element_type);
 883
 884                                 vals += skip;
 885                         }
 886                 } else {
 887                         size_t n_members, i;
 888                         assert(is_compound_type(type));
 889                         n_members = get_compound_n_members(type);
 890                         for(i = 0; i < n_members; ++i) {
 891                                 ir_entity        *member    = get_compound_member(type, i);
 892                                 size_t            offset    = get_entity_offset(member);
 893                                 ir_type          *subtype   = get_entity_type(member);
 894                                 ir_mode          *mode      = get_type_mode(subtype);
 895                                 ir_initializer_t *sub_initializer;
 896
 897                                 assert(i < get_initializer_compound_n_entries(initializer));
 898                                 sub_initializer
 899                                         = get_initializer_compound_value(initializer, i);
 900
 901                                 if(mode != NULL) {
 902                                         size_t offset_bits
 903                                                 = get_entity_offset_bits_remainder(member);
 904                                         size_t value_len   = get_mode_size_bits(mode);
 905
 906                                         if(offset_bits != 0 ||
 907                                                 (value_len != 8 && value_len != 16 && value_len != 32
 908                                                  && value_len != 64)) {
 909                                                 dump_bitfield(&vals[offset], offset_bits,
 910                                                               sub_initializer, subtype);
 911                                                 continue;
 912                                         }
 913                                 }
 914
 915                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 916                         }
 917                 }
 918
 919                 return;
 920         }
 921         }
 922         panic("invalid ir_initializer kind found");
 923 }
 924
 925 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 926 {
 927         const ir_initializer_t *initializer = entity->attr.initializer;
 928         ir_type                *type;
 929         normal_or_bitfield     *vals;
 930         size_t                  size;
 931         size_t                  k;
 932
 933         if(initializer_is_string_const(initializer)) {
 934                 dump_string_initializer(initializer);
 935                 return;
 936         }
 937
 938         type = get_entity_type(entity);
 939         size = get_initializer_size(initializer, type);
 940
 941         if (size == 0)
 942                 return;
 943
 944         /*
 945          * In the worst case, every initializer allocates one byte.
 946          * Moreover, initializer might be big, do not allocate on stack.
 947          */
 948         vals = xcalloc(size, sizeof(vals[0]));
 949
 950 #ifndef NDEBUG
 951         glob_vals = vals;
 952         max_vals  = size;
 953 #endif
 954
 955         dump_ir_initializer(vals, initializer, type);
 956
 957         /* now write values sorted */
 958         for (k = 0; k < size; ) {
 959                 int space     = 0;
 960                 int elem_size = 1;
 961                 if (vals[k].kind == NORMAL) {
 962                         if(vals[k].v.value != NULL) {
 963                                 dump_atomic_init(env, vals[k].v.value);
 964                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
 965                         } else {
 966                                 elem_size = 0;
 967                         }
 968                 } else if(vals[k].kind == TARVAL) {
 969                         tarval *tv   = vals[k].v.tarval;
 970                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 971
 972                         assert(tv != NULL);
 973
 974                         elem_size = size;
 975                         dump_size_type(size);
 976                         dump_arith_tarval(tv, size);
 977                         be_emit_char('\n');
 978                         be_emit_write_line();
 979                 } else {
 980                         assert(vals[k].kind == BITFIELD);
 981                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 982                         be_emit_write_line();
 983                 }
 984
 985                 k += elem_size;
 986                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 987                         ++space;
 988                         ++k;
 989                 }
 990
 991                 /* a gap */
 992                 if (space > 0) {
 993                         be_emit_irprintf("\t.skip\t%d\n", space);
 994                         be_emit_write_line();
 995                 }
 996         }
 997         xfree(vals);
 998 }
 999
1000 /**
1001  * Dump an initializer for a compound entity.
1002  */
1003 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1004 {
1005         normal_or_bitfield *vals;
1006         int i, j, n;
1007         unsigned k, last_ofs;
1008
1009         if(ent->has_initializer) {
1010                 dump_initializer(env, ent);
1011                 return;
1012         }
1013
1014         n = get_compound_ent_n_values(ent);
1015
1016         /* Find the initializer size. Sorrily gcc support a nasty feature:
1017            The last field of a compound may be a flexible array. This allows
1018            initializers bigger than the type size. */
1019         last_ofs = get_type_size_bytes(get_entity_type(ent));
1020         for (i = 0; i < n; ++i) {
1021                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1022                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1023                 ir_node  *value         = get_compound_ent_value(ent, i);
1024                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1025
1026                 offset += (value_len + bits_remainder + 7) >> 3;
1027
1028                 if (offset > last_ofs) {
1029                         last_ofs = offset;
1030                 }
1031         }
1032
1033         /*
1034          * In the worst case, every initializer allocates one byte.
1035          * Moreover, initializer might be big, do not allocate on stack.
1036          */
1037         vals = xcalloc(last_ofs, sizeof(vals[0]));
1038
1039         /* collect the values and store them at the offsets */
1040         for (i = 0; i < n; ++i) {
1041                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1042                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1043                 ir_node  *value      = get_compound_ent_value(ent, i);
1044                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1045
1046                 assert(offset_bits >= 0);
1047
1048                 if (offset_bits != 0 ||
1049                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1050                         tarval *tv = get_atomic_init_tv(value);
1051                         unsigned char curr_bits, last_bits = 0;
1052                         if (tv == NULL) {
1053                                 panic("Couldn't get numeric value for bitfield initializer '%s'",
1054                                       get_entity_ld_name(ent));
1055                         }
1056                         /* normalize offset */
1057                         offset += offset_bits >> 3;
1058                         offset_bits &= 7;
1059
1060                         for (j = 0; value_len + offset_bits > 0; ++j) {
1061                                 assert(offset + j < last_ofs);
1062                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1063                                 vals[offset + j].kind = BITFIELD;
1064                                 curr_bits = get_tarval_sub_bits(tv, j);
1065                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1066                                 value_len -= 8;
1067                                 last_bits = curr_bits;
1068                         }
1069                 } else {
1070                         int i;
1071
1072                         assert(offset < last_ofs);
1073                         assert(vals[offset].kind == NORMAL);
1074                         for (i = 1; i < value_len / 8; ++i) {
1075                                 assert(vals[offset + i].v.value == NULL);
1076                         }
1077                         vals[offset].v.value = value;
1078                 }
1079         }
1080
1081         /* now write them sorted */
1082         for (k = 0; k < last_ofs; ) {
1083                 int space = 0, skip = 0;
1084                 if (vals[k].kind == NORMAL) {
1085                         if(vals[k].v.value != NULL) {
1086                                 dump_atomic_init(env, vals[k].v.value);
1087                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1088                         } else {
1089                                 space = 1;
1090                         }
1091                 } else {
1092                         assert(vals[k].kind == BITFIELD);
1093                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1094                 }
1095
1096                 ++k;
1097                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1098                         ++space;
1099                         ++k;
1100                 }
1101                 space -= skip;
1102                 assert(space >= 0);
1103
1104                 /* a gap */
1105                 if (space > 0) {
1106                         be_emit_irprintf("\t.skip\t%d\n", space);
1107                         be_emit_write_line();
1108                 }
1109         }
1110         xfree(vals);
1111 }
1112
1113 static void emit_align(unsigned alignment)
1114 {
1115         if (!is_po2(alignment))
1116                 panic("alignment not a power of 2");
1117
1118         be_emit_irprintf("\t.p2align\t%u\n", log2_floor(alignment));
1119         be_emit_write_line();
1120 }
1121
1122 /**
1123  * Dump a global entity.
1124  *
1125  * @param env           the gas output environment
1126  * @param ent           the entity to be dumped
1127  */
1128 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1129 {
1130         ir_type          *type           = get_entity_type(ent);
1131         ident            *ld_ident       = get_entity_ld_ident(ent);
1132         unsigned          align          = get_type_alignment_bytes(type);
1133         int               emit_as_common = 0;
1134         be_gas_section_t  section        = env->section;
1135         ir_variability    variability    = get_entity_variability(ent);
1136         ir_visibility     visibility     = get_entity_visibility(ent);
1137
1138         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1139                 return;
1140         }
1141
1142         if (section != (be_gas_section_t) -1) {
1143                 emit_as_common = 0;
1144         } else if (variability == variability_constant) {
1145                 /* a constant entity, put it on the rdata */
1146                 section = GAS_SECTION_RODATA;
1147                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1148                                 && ent_is_string_const(ent)) {
1149                         section = GAS_SECTION_CSTRING;
1150                 }
1151         } else if (variability == variability_uninitialized) {
1152                 /* uninitialized entity put it in bss segment */
1153                 section = GAS_SECTION_COMMON;
1154                 if (visibility != visibility_local)
1155                         emit_as_common = 1;
1156         } else {
1157                 section = GAS_SECTION_DATA;
1158         }
1159
1160         if(!emit_as_common) {
1161                 be_gas_emit_switch_section(section);
1162         }
1163
1164         be_dbg_variable(ent);
1165
1166         /* global or not global */
1167         if (visibility == visibility_external_visible && !emit_as_common) {
1168                 be_emit_cstring(".globl\t");
1169                 be_emit_ident(ld_ident);
1170                 be_emit_char('\n');
1171                 be_emit_write_line();
1172         } else if(visibility == visibility_external_allocated) {
1173                 be_emit_cstring(".globl\t");
1174                 be_emit_ident(ld_ident);
1175                 be_emit_char('\n');
1176                 be_emit_write_line();
1177                 /* we can return now... */
1178                 return;
1179         }
1180         /* alignment */
1181         if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1182                         && section != GAS_SECTION_PIC_SYMBOLS) {
1183                 emit_align(align);
1184         }
1185
1186         if (visibility != visibility_external_allocated && !emit_as_common
1187                         && be_gas_flavour == GAS_FLAVOUR_ELF) {
1188                 be_emit_cstring("\t.type\t");
1189                 be_emit_ident(ld_ident);
1190                 be_emit_cstring(", @object\n\t.size\t");
1191                 be_emit_ident(ld_ident);
1192                 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1193         }
1194
1195         if (!emit_as_common) {
1196                 be_emit_ident(ld_ident);
1197                 be_emit_cstring(":\n");
1198                 be_emit_write_line();
1199         }
1200
1201         if (variability == variability_uninitialized) {
1202                 if (emit_as_common) {
1203                         switch (be_gas_flavour) {
1204                         case GAS_FLAVOUR_ELF:
1205                         case GAS_FLAVOUR_MACH_O:
1206                         case GAS_FLAVOUR_YASM:
1207                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1208                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1209                                 be_emit_write_line();
1210                                 break;
1211                         case GAS_FLAVOUR_MINGW:
1212                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1213                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1214                                 be_emit_write_line();
1215                                 break;
1216                         }
1217                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1218                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1219                                 be_emit_cstring("\t.indirect_symbol ");
1220                                 be_emit_ident(get_entity_ident(ent));
1221                                 be_emit_char('\n');
1222                                 be_emit_write_line();
1223                                 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1224                                 be_emit_write_line();
1225                         } else {
1226                                 panic("PIC trampolines not yet supported in this gas mode");
1227                         }
1228                 } else {
1229                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1230                         be_emit_write_line();
1231                 }
1232         } else {
1233                 if (is_atomic_entity(ent)) {
1234                         dump_atomic_init(env, get_atomic_ent_value(ent));
1235                 } else {
1236                         /* sort_compound_ent_values(ent); */
1237
1238                         switch (get_type_tpop_code(get_entity_type(ent))) {
1239                         case tpo_array:
1240                                 if (ent_is_string_const(ent))
1241                                         dump_string_cst(ent);
1242                                 else
1243                                         dump_compound_init(env, ent);
1244                                 break;
1245                         case tpo_struct:
1246                         case tpo_class:
1247                         case tpo_union:
1248                                 dump_compound_init(env, ent);
1249                                 break;
1250                         default:
1251                                 assert(0);
1252                         }
1253                 }
1254         }
1255 }
1256
1257 /**
1258  * Dumps declarations of global variables and the initialization code.
1259  *
1260  * @param gt                a global like type, either the global or the TLS one
1261  * @param env               an environment
1262  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1263  *                          its visited flag set are ignored
1264  */
1265 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1266                                 int only_emit_marked)
1267 {
1268         int i, n = get_compound_n_members(gt);
1269         waitq *worklist = new_waitq();
1270
1271         if (only_emit_marked) {
1272                 for (i = 0; i < n; i++) {
1273                         ir_entity *ent = get_compound_member(gt, i);
1274                         if (is_entity_backend_marked(ent) ||
1275                             get_entity_visibility(ent) != visibility_external_allocated) {
1276                                 waitq_put(worklist, ent);
1277                                 set_entity_backend_marked(ent, 1);
1278                         }
1279                 }
1280         } else {
1281                 for (i = 0; i < n; i++) {
1282                         ir_entity *ent = get_compound_member(gt, i);
1283                         set_entity_backend_marked(ent, 1);
1284                         waitq_put(worklist, ent);
1285                 }
1286         }
1287
1288         env->worklist = worklist;
1289
1290         while (!waitq_empty(worklist)) {
1291                 ir_entity *ent = waitq_get(worklist);
1292
1293                 dump_global(env, ent);
1294         }
1295
1296         del_waitq(worklist);
1297         env->worklist = NULL;
1298 }
1299
1300 /************************************************************************/
1301
1302 /* Generate all entities. */
1303 void be_gas_emit_decls(const be_main_env_t *main_env,
1304                        int only_emit_marked_entities)
1305 {
1306         be_gas_decl_env_t env;
1307         memset(&env, 0, sizeof(env));
1308
1309         env.main_env = main_env;
1310
1311         /* dump global type */
1312         env.section = (be_gas_section_t) -1;
1313         be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1314         env.section = GAS_SECTION_TLS;
1315         be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1316         env.section = GAS_SECTION_CONSTRUCTORS;
1317         be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1318                             only_emit_marked_entities);
1319         env.section = GAS_SECTION_DESTRUCTORS;
1320         be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1321                             only_emit_marked_entities);
1322
1323         env.section = GAS_SECTION_PIC_SYMBOLS;
1324         be_gas_dump_globals(main_env->pic_symbols_type, &env,
1325                             only_emit_marked_entities);
1326
1327         if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1328                 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1329                 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1330                                     only_emit_marked_entities);
1331                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1332                         be_emit_cstring("\t.subsections_via_symbols\n");
1333                         be_emit_write_line();
1334                 }
1335         }
1336 }