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                 /* Beware: Mixed endian output!  One little endian number emitted as
 253                  * three longs.  Each long initializer is written in big endian. */
 254                 be_emit_irprintf(
 255                         "\t.long\t0x%02x%02x%02x%02x\n"
 256                         "\t.long\t0x%02x%02x%02x%02x\n"
 257                         "\t.long\t0x%02x%02x%02x%02x",
 258                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 259                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0),
 260                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 261                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 262                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 263                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8)
 264                 );
 265                 return;
 266
 267         case 16:
 268                 be_emit_irprintf(
 269                         "\t.long\t0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x",
 270                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 271                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 272                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 273                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8),
 274                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 275                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 276                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 277                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0)
 278                 );
 279                 return;
 280         }
 281
 282         panic("Can't dump a tarval with %d bytes", bytes);
 283 }
 284
 285 /**
 286  * Return the label prefix for labeled blocks.
 287  */
 288 const char *be_gas_block_label_prefix(void) {
 289         return ".LG";
 290 }
 291
 292 /**
 293  * Return the label prefix for labeled instructions.
 294  */
 295 const char *be_gas_insn_label_prefix(void) {
 296         return ".LE";
 297 }
 298
 299 /**
 300  * Dump a label.
 301  */
 302 static void dump_label(ir_label_t label) {
 303         be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
 304 }
 305
 306 /**
 307  * Return the tarval of an atomic initializer.
 308  *
 309  * @param init  a node representing the initializer (on the const code irg)
 310  *
 311  * @return the tarval
 312  */
 313 static tarval *get_atomic_init_tv(ir_node *init)
 314 {
 315         for (;;) {
 316                 ir_mode *mode = get_irn_mode(init);
 317
 318                 switch (get_irn_opcode(init)) {
 319
 320                 case iro_Cast:
 321                         init = get_Cast_op(init);
 322                         continue;
 323
 324                 case iro_Conv:
 325                         init = get_Conv_op(init);
 326                         continue;
 327
 328                 case iro_Const:
 329                         return get_Const_tarval(init);
 330
 331                 case iro_SymConst:
 332                         switch (get_SymConst_kind(init)) {
 333                         case symconst_type_size:
 334                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 335
 336                         case symconst_type_align:
 337                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 338
 339                         case symconst_ofs_ent:
 340                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 341
 342                         case symconst_enum_const:
 343                                 return get_enumeration_value(get_SymConst_enum(init));
 344
 345                         case symconst_label:
 346                                 return NULL;
 347
 348                         default:
 349                                 return NULL;
 350                         }
 351
 352                 default:
 353                         return NULL;
 354                 }
 355         }
 356 }
 357
 358 /**
 359  * Dump an atomic value.
 360  *
 361  * @param env   the gas output environment
 362  * @param init  a node representing the atomic value (on the const code irg)
 363  */
 364 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 365 {
 366         ir_mode *mode = get_irn_mode(init);
 367         int bytes     = get_mode_size_bytes(mode);
 368         tarval *tv;
 369         ir_label_t label;
 370         ir_entity *ent;
 371
 372         init = skip_Id(init);
 373
 374         switch (get_irn_opcode(init)) {
 375         case iro_Cast:
 376                 do_dump_atomic_init(env, get_Cast_op(init));
 377                 return;
 378
 379         case iro_Conv:
 380                 do_dump_atomic_init(env, get_Conv_op(init));
 381                 return;
 382
 383         case iro_Const:
 384                 tv = get_Const_tarval(init);
 385
 386                 /* it's a arithmetic value */
 387                 dump_arith_tarval(tv, bytes);
 388                 return;
 389
 390         case iro_SymConst:
 391                 switch (get_SymConst_kind(init)) {
 392                 case symconst_addr_name:
 393                         be_emit_ident(get_SymConst_name(init));
 394                         break;
 395
 396                 case symconst_addr_ent:
 397                         ent = get_SymConst_entity(init);
 398                         if(!is_entity_backend_marked(ent)) {
 399                                 waitq_put(env->worklist, ent);
 400                                 set_entity_backend_marked(ent, 1);
 401                         }
 402                         be_emit_ident(get_entity_ld_ident(ent));
 403                         break;
 404
 405                 case symconst_ofs_ent:
 406                         ent = get_SymConst_entity(init);
 407 #if 0       /* not needed, is it? */
 408                         if(!is_entity_backend_marked(ent)) {
 409                                 waitq_put(env->worklist, ent);
 410                                 set_entity_backend_marked(ent, 1);
 411                         }
 412 #endif
 413                         be_emit_irprintf("%d", get_entity_offset(ent));
 414                         break;
 415
 416                 case symconst_type_size:
 417                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 418                         break;
 419
 420                 case symconst_type_align:
 421                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 422                         break;
 423
 424                 case symconst_enum_const:
 425                         tv = get_enumeration_value(get_SymConst_enum(init));
 426                         dump_arith_tarval(tv, bytes);
 427                         break;
 428
 429                 case symconst_label:
 430                         label = get_SymConst_label(init);
 431                         dump_label(label);
 432                         break;
 433
 434                 default:
 435                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 436                 }
 437                 return;
 438
 439         case iro_Add:
 440                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 441                         panic("Constant must be int or pointer for '+' to work");
 442                 }
 443                 do_dump_atomic_init(env, get_Add_left(init));
 444                 be_emit_cstring(" + ");
 445                 do_dump_atomic_init(env, get_Add_right(init));
 446                 return;
 447
 448         case iro_Sub:
 449                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 450                         panic("Constant must be int or pointer for '-' to work");
 451                 }
 452                 do_dump_atomic_init(env, get_Sub_left(init));
 453                 be_emit_cstring(" - ");
 454                 do_dump_atomic_init(env, get_Sub_right(init));
 455                 return;
 456
 457         case iro_Mul:
 458                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 459                         panic("Constant must be int or pointer for '*' to work");
 460                 }
 461                 do_dump_atomic_init(env, get_Mul_left(init));
 462                 be_emit_cstring(" * ");
 463                 do_dump_atomic_init(env, get_Mul_right(init));
 464                 return;
 465
 466         default:
 467                 panic("dump_atomic_init(): unsupported IR-node %+F", init);
 468         }
 469 }
 470
 471 /**
 472  * Dumps the type for given size (.byte, .long, ...)
 473  *
 474  * @param size  the size in bytes
 475  */
 476 static void dump_size_type(size_t size) {
 477         switch (size) {
 478         case 1:
 479                 be_emit_cstring("\t.byte\t");
 480                 break;
 481
 482         case 2:
 483                 be_emit_cstring("\t.word\t");
 484                 break;
 485
 486         case 4:
 487                 be_emit_cstring("\t.long\t");
 488                 break;
 489
 490         case 8:
 491                 be_emit_cstring("\t.quad\t");
 492                 break;
 493
 494         case 10:
 495         case 12:
 496                 /* handled in arith */
 497                 break;
 498
 499         case 16:
 500                 be_emit_cstring("\t.octa\t");
 501                 break;
 502
 503         default:
 504                 panic("Try to dump a type with %u bytes", (unsigned)size);
 505         }
 506 }
 507
 508 /**
 509  * Emit an atomic value.
 510  *
 511  * @param env   the gas output environment
 512  * @param init  a node representing the atomic value (on the const code irg)
 513  */
 514 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 515 {
 516         ir_mode *mode = get_irn_mode(init);
 517         int bytes     = get_mode_size_bytes(mode);
 518
 519         dump_size_type(bytes);
 520         do_dump_atomic_init(env, init);
 521         be_emit_char('\n');
 522         be_emit_write_line();
 523 }
 524
 525 /************************************************************************/
 526 /* Routines to dump global variables                                    */
 527 /************************************************************************/
 528
 529 static int initializer_is_string_const(const ir_initializer_t *initializer)
 530 {
 531         size_t i, len;
 532         int found_printable = 0;
 533
 534         if(initializer->kind != IR_INITIALIZER_COMPOUND)
 535                 return 0;
 536
 537         len = initializer->compound.n_initializers;
 538         if (len < 1)
 539                 return 0;
 540         for(i = 0; i < len; ++i) {
 541                 int               c;
 542                 tarval           *tv;
 543                 ir_mode          *mode;
 544                 ir_initializer_t *sub_initializer
 545                         = initializer->compound.initializers[i];
 546
 547                 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
 548                         return 0;
 549
 550                 tv   = sub_initializer->tarval.value;
 551                 mode = get_tarval_mode(tv);
 552
 553                 if (!mode_is_int(mode)
 554                                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 555                         return 0;
 556
 557                 c = get_tarval_long(tv);
 558                 if (isgraph(c) || isspace(c))
 559                         found_printable = 1;
 560                 else if(c != 0)
 561                         return 0;
 562
 563                 if (i == len - 1 && c != '\0')
 564                         return 0;
 565         }
 566
 567         return found_printable;
 568 }
 569
 570 /**
 571  * Determine if an entity is a string constant
 572  * @param ent The entity
 573  * @return 1 if it is a string constant, 0 otherwise
 574  */
 575 static int ent_is_string_const(ir_entity *ent)
 576 {
 577         ir_type *type, *element_type;
 578         ir_mode *mode;
 579         int i, c, n;
 580         int found_printable = 0;
 581
 582         type = get_entity_type(ent);
 583
 584         /* if it's an array */
 585         if (!is_Array_type(type))
 586                 return 0;
 587
 588         element_type = get_array_element_type(type);
 589
 590         /* and the array's element type is primitive */
 591         if (!is_Primitive_type(element_type))
 592                 return 0;
 593
 594         /* and the mode of the element type is an int of
 595          * the same size as the byte mode */
 596         mode = get_type_mode(element_type);
 597         if (!mode_is_int(mode)
 598                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 599                 return 0;
 600
 601         if(ent->has_initializer) {
 602                 /* TODO */
 603                 return 0;
 604         } else {
 605                 /* if it contains only printable chars and a 0 at the end */
 606                 n = get_compound_ent_n_values(ent);
 607                 for (i = 0; i < n; ++i) {
 608                         ir_node *irn = get_compound_ent_value(ent, i);
 609                         if (! is_Const(irn))
 610                                 return 0;
 611
 612                         c = (int) get_tarval_long(get_Const_tarval(irn));
 613
 614                         if (isgraph(c) || isspace(c))
 615                                 found_printable = 1;
 616                         else if(c != 0)
 617                                 return 0;
 618
 619                         if (i == n - 1 && c != '\0')
 620                                 return 0;
 621                 }
 622         }
 623
 624         /* then we can emit it as a string constant */
 625         return found_printable;
 626 }
 627
 628 /**
 629  * Dump a string constant.
 630  * No checks are made!!
 631  *
 632  * @param ent  The entity to dump.
 633  */
 634 static void dump_string_cst(ir_entity *ent)
 635 {
 636         int      i, len;
 637         int      output_len;
 638         ir_type *type;
 639         int      type_size;
 640         int      remaining_space;
 641
 642         len        = get_compound_ent_n_values(ent);
 643         output_len = len;
 644         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 645                 be_emit_cstring("\t.ascii \"");
 646         } else {
 647                 be_emit_cstring("\t.string \"");
 648                 output_len -= 1;
 649         }
 650
 651         for (i = 0; i < output_len; ++i) {
 652                 ir_node *irn;
 653                 int c;
 654
 655                 irn = get_compound_ent_value(ent, i);
 656                 c = (int) get_tarval_long(get_Const_tarval(irn));
 657
 658                 switch (c) {
 659                 case '"' : be_emit_cstring("\\\""); break;
 660                 case '\n': be_emit_cstring("\\n"); break;
 661                 case '\r': be_emit_cstring("\\r"); break;
 662                 case '\t': be_emit_cstring("\\t"); break;
 663                 case '\\': be_emit_cstring("\\\\"); break;
 664                 default  :
 665                         if (isprint(c))
 666                                 be_emit_char(c);
 667                         else
 668                                 be_emit_irprintf("\\%o", c);
 669                         break;
 670                 }
 671         }
 672         be_emit_cstring("\"\n");
 673         be_emit_write_line();
 674
 675         type            = get_entity_type(ent);
 676         type_size       = get_type_size_bytes(type);
 677         remaining_space = type_size - len;
 678         assert(remaining_space >= 0);
 679         if(remaining_space > 0) {
 680                 be_emit_irprintf("\t.space\t%d\n", remaining_space);
 681         }
 682 }
 683
 684 static void dump_string_initializer(const ir_initializer_t *initializer)
 685 {
 686         size_t i, len;
 687
 688         len = initializer->compound.n_initializers;
 689         if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 690                 be_emit_cstring("\t.ascii \"");
 691         } else {
 692                 be_emit_cstring("\t.string \"");
 693                 len -= 1;
 694         }
 695
 696         for(i = 0; i < len; ++i) {
 697                 const ir_initializer_t *sub_initializer
 698                         = get_initializer_compound_value(initializer, i);
 699
 700                 tarval *tv = get_initializer_tarval_value(sub_initializer);
 701                 int     c  = get_tarval_long(tv);
 702
 703                 switch (c) {
 704                 case '"' : be_emit_cstring("\\\""); break;
 705                 case '\n': be_emit_cstring("\\n"); break;
 706                 case '\r': be_emit_cstring("\\r"); break;
 707                 case '\t': be_emit_cstring("\\t"); break;
 708                 case '\\': be_emit_cstring("\\\\"); break;
 709                 default  :
 710                         if (isprint(c))
 711                                 be_emit_char(c);
 712                         else
 713                                 be_emit_irprintf("\\%o", c);
 714                         break;
 715                 }
 716         }
 717         be_emit_cstring("\"\n");
 718         be_emit_write_line();
 719 }
 720
 721 enum normal_or_bitfield_kind {
 722         NORMAL = 0,
 723         TARVAL,
 724         BITFIELD
 725 };
 726
 727 typedef struct {
 728         enum normal_or_bitfield_kind kind;
 729         union {
 730                 ir_node       *value;
 731                 tarval        *tarval;
 732                 unsigned char  bf_val;
 733         } v;
 734 } normal_or_bitfield;
 735
 736 static int is_type_variable_size(ir_type *type)
 737 {
 738         (void) type;
 739         /* TODO */
 740         return 0;
 741 }
 742
 743 static size_t get_initializer_size(const ir_initializer_t *initializer,
 744                                    ir_type *type)
 745 {
 746         switch(get_initializer_kind(initializer)) {
 747         case IR_INITIALIZER_TARVAL: {
 748                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 749                 return get_type_size_bytes(type);
 750         }
 751         case IR_INITIALIZER_CONST:
 752         case IR_INITIALIZER_NULL:
 753                 return get_type_size_bytes(type);
 754         case IR_INITIALIZER_COMPOUND: {
 755                 if(!is_type_variable_size(type)) {
 756                         return get_type_size_bytes(type);
 757                 } else {
 758                         unsigned n_entries
 759                                 = get_initializer_compound_n_entries(initializer);
 760                         unsigned i;
 761                         unsigned initializer_size = get_type_size_bytes(type);
 762                         for(i = 0; i < n_entries; ++i) {
 763                                 ir_entity *entity = get_compound_member(type, i);
 764                                 ir_type   *type   = get_entity_type(entity);
 765
 766                                 const ir_initializer_t *sub_initializer
 767                                         = get_initializer_compound_value(initializer, i);
 768
 769                                 unsigned offset = get_entity_offset(entity);
 770                                 unsigned size   = get_initializer_size(sub_initializer, type);
 771
 772                                 if(offset + size > initializer_size) {
 773                                         initializer_size = offset + size;
 774                                 }
 775                         }
 776                         return initializer_size;
 777                 }
 778         }
 779         }
 780
 781         panic("found invalid initializer");
 782 }
 783
 784 #ifndef NDEBUG
 785 static normal_or_bitfield *glob_vals;
 786 static size_t              max_vals;
 787 #endif
 788
 789 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
 790                           const ir_initializer_t *initializer, ir_type *type)
 791 {
 792         unsigned char  last_bits = 0;
 793         ir_mode       *mode      = get_type_mode(type);
 794         tarval        *tv        = NULL;
 795         unsigned char  curr_bits;
 796         int            value_len;
 797         int            j;
 798
 799         switch(get_initializer_kind(initializer)) {
 800         case IR_INITIALIZER_NULL:
 801                 return;
 802         case IR_INITIALIZER_TARVAL:
 803                 tv = get_initializer_tarval_value(initializer);
 804                 break;
 805         case IR_INITIALIZER_CONST: {
 806                 ir_node *node = get_initializer_const_value(initializer);
 807                 if(!is_Const(node)) {
 808                         panic("bitfield initializer not a Const node");
 809                 }
 810                 tv = get_Const_tarval(node);
 811                 break;
 812         }
 813         case IR_INITIALIZER_COMPOUND:
 814                 panic("bitfield initializer is compound");
 815         }
 816         if (tv == NULL) {
 817                 panic("Couldn't get numeric value for bitfield initializer");
 818         }
 819
 820         /* normalize offset */
 821         vals        += offset_bits >> 3;
 822         offset_bits &= 7;
 823         value_len    = get_mode_size_bits(mode);
 824
 825         /* combine bits with existing bits */
 826         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 827                 assert((size_t) (vals - glob_vals) + j < max_vals);
 828                 assert(vals[j].kind == BITFIELD ||
 829                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 830                 vals[j].kind = BITFIELD;
 831                 curr_bits    = get_tarval_sub_bits(tv, j);
 832                 vals[j].v.bf_val
 833                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 834                 value_len -= 8;
 835                 last_bits = curr_bits;
 836         }
 837 }
 838
 839 static void dump_ir_initializer(normal_or_bitfield *vals,
 840                                 const ir_initializer_t *initializer,
 841                                 ir_type *type)
 842 {
 843         assert((size_t) (vals - glob_vals) < max_vals);
 844
 845         switch(get_initializer_kind(initializer)) {
 846         case IR_INITIALIZER_NULL:
 847                 return;
 848         case IR_INITIALIZER_TARVAL: {
 849                 size_t i;
 850
 851                 assert(vals->kind != BITFIELD);
 852                 vals->kind     = TARVAL;
 853                 vals->v.tarval = get_initializer_tarval_value(initializer);
 854                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 855                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 856                         vals[i].kind    = NORMAL;
 857                         vals[i].v.value = NULL;
 858                 }
 859                 return;
 860         }
 861         case IR_INITIALIZER_CONST: {
 862                 size_t i;
 863
 864                 assert(vals->kind != BITFIELD);
 865                 vals->kind    = NORMAL;
 866                 vals->v.value = get_initializer_const_value(initializer);
 867                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 868                         vals[i].kind    = NORMAL;
 869                         vals[i].v.value = NULL;
 870                 }
 871                 return;
 872         }
 873         case IR_INITIALIZER_COMPOUND: {
 874                 size_t i = 0;
 875                 size_t n = get_initializer_compound_n_entries(initializer);
 876
 877                 if(is_Array_type(type)) {
 878                         ir_type *element_type = get_array_element_type(type);
 879                         size_t   skip         = get_type_size_bytes(element_type);
 880                         size_t   alignment    = get_type_alignment_bytes(element_type);
 881                         size_t   misalign     = skip % alignment;
 882                         if(misalign != 0) {
 883                                 skip += alignment - misalign;
 884                         }
 885
 886                         for(i = 0; i < n; ++i) {
 887                                 ir_initializer_t *sub_initializer
 888                                         = get_initializer_compound_value(initializer, i);
 889
 890                                 dump_ir_initializer(vals, sub_initializer, element_type);
 891
 892                                 vals += skip;
 893                         }
 894                 } else {
 895                         size_t n_members, i;
 896                         assert(is_compound_type(type));
 897                         n_members = get_compound_n_members(type);
 898                         for(i = 0; i < n_members; ++i) {
 899                                 ir_entity        *member    = get_compound_member(type, i);
 900                                 size_t            offset    = get_entity_offset(member);
 901                                 ir_type          *subtype   = get_entity_type(member);
 902                                 ir_mode          *mode      = get_type_mode(subtype);
 903                                 ir_initializer_t *sub_initializer;
 904
 905                                 assert(i < get_initializer_compound_n_entries(initializer));
 906                                 sub_initializer
 907                                         = get_initializer_compound_value(initializer, i);
 908
 909                                 if(mode != NULL) {
 910                                         size_t offset_bits
 911                                                 = get_entity_offset_bits_remainder(member);
 912                                         size_t value_len   = get_mode_size_bits(mode);
 913
 914                                         if(offset_bits != 0 ||
 915                                                 (value_len != 8 && value_len != 16 && value_len != 32
 916                                                  && value_len != 64)) {
 917                                                 dump_bitfield(&vals[offset], offset_bits,
 918                                                               sub_initializer, subtype);
 919                                                 continue;
 920                                         }
 921                                 }
 922
 923                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 924                         }
 925                 }
 926
 927                 return;
 928         }
 929         }
 930         panic("invalid ir_initializer kind found");
 931 }
 932
 933 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 934 {
 935         const ir_initializer_t *initializer = entity->attr.initializer;
 936         ir_type                *type;
 937         normal_or_bitfield     *vals;
 938         size_t                  size;
 939         size_t                  k;
 940
 941         if(initializer_is_string_const(initializer)) {
 942                 dump_string_initializer(initializer);
 943                 return;
 944         }
 945
 946         type = get_entity_type(entity);
 947         size = get_initializer_size(initializer, type);
 948
 949         if (size == 0)
 950                 return;
 951
 952         /*
 953          * In the worst case, every initializer allocates one byte.
 954          * Moreover, initializer might be big, do not allocate on stack.
 955          */
 956         vals = xcalloc(size, sizeof(vals[0]));
 957
 958 #ifndef NDEBUG
 959         glob_vals = vals;
 960         max_vals  = size;
 961 #endif
 962
 963         dump_ir_initializer(vals, initializer, type);
 964
 965         /* now write values sorted */
 966         for (k = 0; k < size; ) {
 967                 int space     = 0;
 968                 int elem_size = 1;
 969                 if (vals[k].kind == NORMAL) {
 970                         if(vals[k].v.value != NULL) {
 971                                 dump_atomic_init(env, vals[k].v.value);
 972                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
 973                         } else {
 974                                 elem_size = 0;
 975                         }
 976                 } else if(vals[k].kind == TARVAL) {
 977                         tarval *tv   = vals[k].v.tarval;
 978                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 979
 980                         assert(tv != NULL);
 981
 982                         elem_size = size;
 983                         dump_size_type(size);
 984                         dump_arith_tarval(tv, size);
 985                         be_emit_char('\n');
 986                         be_emit_write_line();
 987                 } else {
 988                         assert(vals[k].kind == BITFIELD);
 989                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 990                         be_emit_write_line();
 991                 }
 992
 993                 k += elem_size;
 994                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 995                         ++space;
 996                         ++k;
 997                 }
 998
 999                 /* a gap */
1000                 if (space > 0) {
1001                         be_emit_irprintf("\t.space\t%d\n", space);
1002                         be_emit_write_line();
1003                 }
1004         }
1005         xfree(vals);
1006 }
1007
1008 /**
1009  * Dump an initializer for a compound entity.
1010  */
1011 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1012 {
1013         normal_or_bitfield *vals;
1014         int i, j, n;
1015         unsigned k, last_ofs;
1016
1017         if(ent->has_initializer) {
1018                 dump_initializer(env, ent);
1019                 return;
1020         }
1021
1022         n = get_compound_ent_n_values(ent);
1023
1024         /* Find the initializer size. Sorrily gcc support a nasty feature:
1025            The last field of a compound may be a flexible array. This allows
1026            initializers bigger than the type size. */
1027         last_ofs = get_type_size_bytes(get_entity_type(ent));
1028         for (i = 0; i < n; ++i) {
1029                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1030                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1031                 ir_node  *value         = get_compound_ent_value(ent, i);
1032                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1033
1034                 offset += (value_len + bits_remainder + 7) >> 3;
1035
1036                 if (offset > last_ofs) {
1037                         last_ofs = offset;
1038                 }
1039         }
1040
1041         /*
1042          * In the worst case, every initializer allocates one byte.
1043          * Moreover, initializer might be big, do not allocate on stack.
1044          */
1045         vals = xcalloc(last_ofs, sizeof(vals[0]));
1046
1047         /* collect the values and store them at the offsets */
1048         for (i = 0; i < n; ++i) {
1049                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1050                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1051                 ir_node  *value      = get_compound_ent_value(ent, i);
1052                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1053
1054                 assert(offset_bits >= 0);
1055
1056                 if (offset_bits != 0 ||
1057                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1058                         tarval *tv = get_atomic_init_tv(value);
1059                         unsigned char curr_bits, last_bits = 0;
1060                         if (tv == NULL) {
1061                                 panic("Couldn't get numeric value for bitfield initializer '%s'",
1062                                       get_entity_ld_name(ent));
1063                         }
1064                         /* normalize offset */
1065                         offset += offset_bits >> 3;
1066                         offset_bits &= 7;
1067
1068                         for (j = 0; value_len + offset_bits > 0; ++j) {
1069                                 assert(offset + j < last_ofs);
1070                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1071                                 vals[offset + j].kind = BITFIELD;
1072                                 curr_bits = get_tarval_sub_bits(tv, j);
1073                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1074                                 value_len -= 8;
1075                                 last_bits = curr_bits;
1076                         }
1077                 } else {
1078                         int i;
1079
1080                         assert(offset < last_ofs);
1081                         assert(vals[offset].kind == NORMAL);
1082                         for (i = 1; i < value_len / 8; ++i) {
1083                                 assert(vals[offset + i].v.value == NULL);
1084                         }
1085                         vals[offset].v.value = value;
1086                 }
1087         }
1088
1089         /* now write them sorted */
1090         for (k = 0; k < last_ofs; ) {
1091                 int space = 0, skip = 0;
1092                 if (vals[k].kind == NORMAL) {
1093                         if(vals[k].v.value != NULL) {
1094                                 dump_atomic_init(env, vals[k].v.value);
1095                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1096                         } else {
1097                                 space = 1;
1098                         }
1099                 } else {
1100                         assert(vals[k].kind == BITFIELD);
1101                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1102                 }
1103
1104                 ++k;
1105                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1106                         ++space;
1107                         ++k;
1108                 }
1109                 space -= skip;
1110                 assert(space >= 0);
1111
1112                 /* a gap */
1113                 if (space > 0) {
1114                         be_emit_irprintf("\t.space\t%d\n", space);
1115                         be_emit_write_line();
1116                 }
1117         }
1118         xfree(vals);
1119 }
1120
1121 static void emit_align(unsigned alignment)
1122 {
1123         if (!is_po2(alignment))
1124                 panic("alignment not a power of 2");
1125
1126         be_emit_irprintf("\t.p2align\t%u\n", log2_floor(alignment));
1127         be_emit_write_line();
1128 }
1129
1130 /**
1131  * Dump a global entity.
1132  *
1133  * @param env           the gas output environment
1134  * @param ent           the entity to be dumped
1135  */
1136 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1137 {
1138         ir_type          *type           = get_entity_type(ent);
1139         ident            *ld_ident       = get_entity_ld_ident(ent);
1140         unsigned          align          = get_type_alignment_bytes(type);
1141         int               emit_as_common = 0;
1142         be_gas_section_t  section        = env->section;
1143         ir_variability    variability    = get_entity_variability(ent);
1144         ir_visibility     visibility     = get_entity_visibility(ent);
1145
1146         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1147                 return;
1148         }
1149
1150         if (section != (be_gas_section_t) -1) {
1151                 emit_as_common = 0;
1152         } else if (variability == variability_constant) {
1153                 /* a constant entity, put it on the rdata */
1154                 section = GAS_SECTION_RODATA;
1155                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1156                                 && ent_is_string_const(ent)) {
1157                         section = GAS_SECTION_CSTRING;
1158                 }
1159         } else if (variability == variability_uninitialized) {
1160                 /* uninitialized entity put it in bss segment */
1161                 section = GAS_SECTION_COMMON;
1162                 if (visibility != visibility_local)
1163                         emit_as_common = 1;
1164         } else {
1165                 section = GAS_SECTION_DATA;
1166         }
1167
1168         if(!emit_as_common) {
1169                 be_gas_emit_switch_section(section);
1170         }
1171
1172         be_dbg_variable(ent);
1173
1174         /* global or not global */
1175         if (visibility == visibility_external_visible && !emit_as_common) {
1176                 be_emit_cstring(".globl\t");
1177                 be_emit_ident(ld_ident);
1178                 be_emit_char('\n');
1179                 be_emit_write_line();
1180         } else if(visibility == visibility_external_allocated) {
1181                 be_emit_cstring(".globl\t");
1182                 be_emit_ident(ld_ident);
1183                 be_emit_char('\n');
1184                 be_emit_write_line();
1185                 /* we can return now... */
1186                 return;
1187         }
1188         /* alignment */
1189         if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1190                         && section != GAS_SECTION_PIC_SYMBOLS) {
1191                 emit_align(align);
1192         }
1193
1194         if (visibility != visibility_external_allocated && !emit_as_common
1195                         && be_gas_flavour == GAS_FLAVOUR_ELF) {
1196                 be_emit_cstring("\t.type\t");
1197                 be_emit_ident(ld_ident);
1198                 be_emit_cstring(", @object\n\t.size\t");
1199                 be_emit_ident(ld_ident);
1200                 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1201         }
1202
1203         if (!emit_as_common) {
1204                 be_emit_ident(ld_ident);
1205                 be_emit_cstring(":\n");
1206                 be_emit_write_line();
1207         }
1208
1209         if (variability == variability_uninitialized) {
1210                 if (emit_as_common) {
1211                         switch (be_gas_flavour) {
1212                         case GAS_FLAVOUR_ELF:
1213                         case GAS_FLAVOUR_MACH_O:
1214                         case GAS_FLAVOUR_YASM:
1215                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1216                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1217                                 be_emit_write_line();
1218                                 break;
1219                         case GAS_FLAVOUR_MINGW:
1220                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1221                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1222                                 be_emit_write_line();
1223                                 break;
1224                         }
1225                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES
1226                                 || section == GAS_SECTION_PIC_SYMBOLS) {
1227                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1228                                 be_emit_cstring("\t.indirect_symbol ");
1229                                 be_emit_ident(get_entity_ident(ent));
1230                                 be_emit_char('\n');
1231                                 be_emit_write_line();
1232                                 if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1233                                         be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1234                                         be_emit_write_line();
1235                                 } else {
1236                                         assert(section == GAS_SECTION_PIC_SYMBOLS);
1237                                         be_emit_cstring("\t.long 0\n");
1238                                         be_emit_write_line();
1239                                 }
1240                         } else {
1241                                 panic("PIC trampolines not yet supported in this gas mode");
1242                         }
1243                 } else {
1244                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1245                         be_emit_write_line();
1246                 }
1247         } else {
1248                 if (is_atomic_entity(ent)) {
1249                         dump_atomic_init(env, get_atomic_ent_value(ent));
1250                 } else {
1251                         /* sort_compound_ent_values(ent); */
1252
1253                         switch (get_type_tpop_code(get_entity_type(ent))) {
1254                         case tpo_array:
1255                                 if (ent_is_string_const(ent))
1256                                         dump_string_cst(ent);
1257                                 else
1258                                         dump_compound_init(env, ent);
1259                                 break;
1260                         case tpo_struct:
1261                         case tpo_class:
1262                         case tpo_union:
1263                                 dump_compound_init(env, ent);
1264                                 break;
1265                         default:
1266                                 panic("Unimplemented type kind in dump_global()");
1267                         }
1268                 }
1269         }
1270 }
1271
1272 /**
1273  * Dumps declarations of global variables and the initialization code.
1274  *
1275  * @param gt                a global like type, either the global or the TLS one
1276  * @param env               an environment
1277  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1278  *                          its visited flag set are ignored
1279  */
1280 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1281                                 int only_emit_marked)
1282 {
1283         int i, n = get_compound_n_members(gt);
1284         waitq *worklist = new_waitq();
1285
1286         if (only_emit_marked) {
1287                 for (i = 0; i < n; i++) {
1288                         ir_entity *ent = get_compound_member(gt, i);
1289                         if (is_entity_backend_marked(ent) ||
1290                             get_entity_visibility(ent) != visibility_external_allocated) {
1291                                 waitq_put(worklist, ent);
1292                                 set_entity_backend_marked(ent, 1);
1293                         }
1294                 }
1295         } else {
1296                 for (i = 0; i < n; i++) {
1297                         ir_entity *ent = get_compound_member(gt, i);
1298                         set_entity_backend_marked(ent, 1);
1299                         waitq_put(worklist, ent);
1300                 }
1301         }
1302
1303         env->worklist = worklist;
1304
1305         while (!waitq_empty(worklist)) {
1306                 ir_entity *ent = waitq_get(worklist);
1307
1308                 dump_global(env, ent);
1309         }
1310
1311         del_waitq(worklist);
1312         env->worklist = NULL;
1313 }
1314
1315 /************************************************************************/
1316
1317 /* Generate all entities. */
1318 void be_gas_emit_decls(const be_main_env_t *main_env,
1319                        int only_emit_marked_entities)
1320 {
1321         be_gas_decl_env_t env;
1322         memset(&env, 0, sizeof(env));
1323
1324         env.main_env = main_env;
1325
1326         /* dump global type */
1327         env.section = (be_gas_section_t) -1;
1328         be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1329         env.section = GAS_SECTION_TLS;
1330         be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1331         env.section = GAS_SECTION_CONSTRUCTORS;
1332         be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1333                             only_emit_marked_entities);
1334         env.section = GAS_SECTION_DESTRUCTORS;
1335         be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1336                             only_emit_marked_entities);
1337
1338         env.section = GAS_SECTION_PIC_SYMBOLS;
1339         be_gas_dump_globals(main_env->pic_symbols_type, &env,
1340                             only_emit_marked_entities);
1341
1342         if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1343                 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1344                 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1345                                     only_emit_marked_entities);
1346                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1347                         be_emit_cstring("\t.subsections_via_symbols\n");
1348                         be_emit_write_line();
1349                 }
1350         }
1351 }