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 #include "config.h"
  28
  29 #include "begnuas.h"
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34 #include <assert.h>
  35
  36 #include "obst.h"
  37 #include "tv.h"
  38 #include "irnode.h"
  39 #include "irprog.h"
  40 #include "pdeq.h"
  41 #include "entity_t.h"
  42 #include "error.h"
  43
  44 #include "be_t.h"
  45 #include "beemitter.h"
  46 #include "be_dbgout.h"
  47
  48 /** by default, we generate assembler code for the Linux gas */
  49 be_gas_flavour_t be_gas_flavour    = GAS_FLAVOUR_ELF;
  50 bool             be_gas_emit_types = true;
  51
  52 static be_gas_section_t current_section = (be_gas_section_t) -1;
  53
  54 /**
  55  * Return the pseudo-instruction to be issued for a section switch
  56  * depending on the current flavour.
  57  *
  58  * @param section  the section to switch to
  59  *
  60  * @return  the pseudo-instruction
  61  */
  62 static const char *get_section_name(be_gas_section_t section) {
  63         static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
  64                 { /* GAS_FLAVOUR_ELF */
  65                         ".section\t.text",
  66                         ".section\t.data",
  67                         ".section\t.rodata",
  68                         ".section\t.bss",
  69                         ".section\t.tbss,\"awT\",@nobits",
  70                         ".section\t.ctors,\"aw\",@progbits",
  71                         ".section\t.dtors,\"aw\",@progbits",
  72                         NULL, /* no cstring section */
  73                         NULL,
  74                         NULL
  75                 },
  76                 { /* GAS_FLAVOUR_MINGW */
  77                         ".section\t.text",
  78                         ".section\t.data",
  79                         ".section .rdata,\"dr\"",
  80                         ".section\t.bss",
  81                         ".section\t.tbss,\"awT\",@nobits",
  82                         ".section\t.ctors,\"w\"",
  83                         ".section\t.dtors,\"w\"",
  84                         NULL,
  85                         NULL,
  86                         NULL
  87                 },
  88                 { /* GAS_FLAVOUR_YASM */
  89                         ".section\t.text",
  90                         ".section\t.data",
  91                         ".section\t.rodata",
  92                         ".section\t.bss",
  93                         ".section\t.tbss,\"awT\",@nobits",
  94                         ".section\t.ctors,\"aw\",@progbits",
  95                         ".section\t.dtors,\"aw\",@progbits",
  96                         NULL,
  97                         NULL,
  98                         NULL
  99                 },
 100                 { /* GAS_FLAVOUR_MACH_O */
 101                         ".text",
 102                         ".data",
 103                         ".const",
 104                         ".data",
 105                         NULL,             /* TLS is not supported on Mach-O */
 106                         ".mod_init_func",
 107                         NULL,             /* TODO: how is this called? */
 108                         ".cstring",
 109                         ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
 110                         ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
 111                 }
 112         };
 113
 114         assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
 115         assert((int) section >= 0 && section <= GAS_SECTION_LAST);
 116         return text[be_gas_flavour][section];
 117 }
 118
 119 void be_gas_emit_switch_section(be_gas_section_t section) {
 120         if (current_section == section)
 121                 return;
 122
 123         be_emit_char('\t');
 124         be_emit_string(get_section_name(section));
 125         be_emit_char('\n');
 126         be_emit_write_line();
 127         current_section = section;
 128 }
 129
 130 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
 131 {
 132         const char *name = get_entity_ld_name(entity);
 133         const char *fill_byte = "";
 134         unsigned maximum_skip;
 135
 136         be_gas_emit_switch_section(GAS_SECTION_TEXT);
 137
 138         /* write the begin line (used by scripts processing the assembler... */
 139         be_emit_write_line();
 140         be_emit_cstring("# -- Begin  ");
 141         be_emit_string(name);
 142         be_emit_char('\n');
 143         be_emit_write_line();
 144
 145         /* gcc fills space between function with 0x90, no idea if this is needed */
 146         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 147                 fill_byte = "0x90";
 148         }
 149
 150         if (alignment > 0) {
 151                 maximum_skip = (1 << alignment) - 1;
 152                 be_emit_cstring("\t.p2align ");
 153                 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
 154                 be_emit_write_line();
 155         }
 156         if (get_entity_visibility(entity) == visibility_external_visible) {
 157                 be_emit_cstring(".globl ");
 158                 be_emit_string(name);
 159                 be_emit_char('\n');
 160                 be_emit_write_line();
 161         }
 162
 163         switch (be_gas_flavour) {
 164         case GAS_FLAVOUR_ELF:
 165                 be_emit_cstring("\t.type\t");
 166                 be_emit_string(name);
 167                 be_emit_cstring(", @function\n");
 168                 be_emit_write_line();
 169                 break;
 170         case GAS_FLAVOUR_MINGW:
 171                 be_emit_cstring("\t.def\t");
 172                 be_emit_string(name);
 173                 if (get_entity_visibility(entity) == visibility_external_visible) {
 174                         be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
 175                 } else {
 176                         be_emit_cstring(";\t.scl\t3;\t.type\t32;\t.endef\n");
 177                 }
 178                 be_emit_write_line();
 179                 break;
 180         case GAS_FLAVOUR_MACH_O:
 181         case GAS_FLAVOUR_YASM:
 182                 break;
 183         }
 184         be_emit_string(name);
 185         be_emit_cstring(":\n");
 186         be_emit_write_line();
 187 }
 188
 189 void be_gas_emit_function_epilog(ir_entity *entity)
 190 {
 191         const char *name = get_entity_ld_name(entity);
 192
 193         if (be_gas_flavour == GAS_FLAVOUR_ELF) {
 194                 be_emit_cstring("\t.size\t");
 195                 be_emit_string(name);
 196                 be_emit_cstring(", .-");
 197                 be_emit_string(name);
 198                 be_emit_char('\n');
 199                 be_emit_write_line();
 200         }
 201
 202         be_emit_cstring("# -- End  ");
 203         be_emit_string(name);
 204         be_emit_char('\n');
 205         be_emit_write_line();
 206 }
 207
 208 /**
 209  * An environment containing all needed dumper data.
 210  * Currently we create the file completely in memory first, then
 211  * write it to the disk. This is an artifact from the old C-generating backend
 212  * and even there NOT needed. So we might change it in the future.
 213  */
 214 typedef struct _be_gas_decl_env {
 215         be_gas_section_t     section;
 216         waitq               *worklist;           /**< A worklist we use to place not yet handled entities on. */
 217 } be_gas_decl_env_t;
 218
 219 /************************************************************************/
 220
 221 /**
 222  * Output a tarval.
 223  *
 224  * @param tv     the tarval
 225  * @param bytes  the width of the tarvals value in bytes
 226  */
 227 static void dump_arith_tarval(tarval *tv, int bytes)
 228 {
 229         switch (bytes) {
 230         case 1:
 231                 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
 232                 return;
 233
 234         case 2:
 235                 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 236                 return;
 237
 238         case 4:
 239                 be_emit_irprintf("0x%02x%02x%02x%02x",
 240                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 241                 return;
 242
 243         case 8:
 244                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
 245                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 246                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 247                 return;
 248
 249         case 12:
 250                 /* Beware: Mixed endian output!  One little endian number emitted as
 251                  * three longs.  Each long initializer is written in big endian. */
 252                 be_emit_irprintf(
 253                         "\t.long\t0x%02x%02x%02x%02x\n"
 254                         "\t.long\t0x%02x%02x%02x%02x\n"
 255                         "\t.long\t0x%02x%02x%02x%02x",
 256                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 257                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0),
 258                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 259                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 260                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 261                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8)
 262                 );
 263                 return;
 264
 265         case 16:
 266                 be_emit_irprintf(
 267                         "\t.long\t0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x",
 268                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 269                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 270                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 271                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8),
 272                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 273                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 274                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 275                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0)
 276                 );
 277                 return;
 278         }
 279
 280         panic("Can't dump a tarval with %d bytes", bytes);
 281 }
 282
 283 /**
 284  * Return the label prefix for labeled blocks.
 285  */
 286 const char *be_gas_block_label_prefix(void) {
 287         return ".LG";
 288 }
 289
 290 /**
 291  * Return the label prefix for labeled instructions.
 292  */
 293 const char *be_gas_insn_label_prefix(void) {
 294         return ".LE";
 295 }
 296
 297 void be_gas_emit_entity(ir_entity *entity)
 298 {
 299         if (entity->type == firm_code_type) {
 300                 ir_label_t label = get_entity_label(entity);
 301                 be_emit_string(be_gas_block_label_prefix());
 302                 be_emit_irprintf("%lu", label);
 303         } else {
 304                 be_emit_ident(get_entity_ld_ident(entity));
 305         }
 306 }
 307
 308 /**
 309  * Return the tarval of an atomic initializer.
 310  *
 311  * @param init  a node representing the initializer (on the const code irg)
 312  *
 313  * @return the tarval
 314  */
 315 static tarval *get_atomic_init_tv(ir_node *init)
 316 {
 317         for (;;) {
 318                 ir_mode *mode = get_irn_mode(init);
 319
 320                 switch (get_irn_opcode(init)) {
 321
 322                 case iro_Cast:
 323                         init = get_Cast_op(init);
 324                         continue;
 325
 326                 case iro_Conv:
 327                         init = get_Conv_op(init);
 328                         continue;
 329
 330                 case iro_Const:
 331                         return get_Const_tarval(init);
 332
 333                 case iro_SymConst:
 334                         switch (get_SymConst_kind(init)) {
 335                         case symconst_type_size:
 336                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 337
 338                         case symconst_type_align:
 339                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 340
 341                         case symconst_ofs_ent:
 342                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 343
 344                         case symconst_enum_const:
 345                                 return get_enumeration_value(get_SymConst_enum(init));
 346
 347                         default:
 348                                 return NULL;
 349                         }
 350
 351                 default:
 352                         return NULL;
 353                 }
 354         }
 355 }
 356
 357 /**
 358  * Dump an atomic value.
 359  *
 360  * @param env   the gas output environment
 361  * @param init  a node representing the atomic value (on the const code irg)
 362  */
 363 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 364 {
 365         ir_mode *mode = get_irn_mode(init);
 366         int bytes     = get_mode_size_bytes(mode);
 367         tarval *tv;
 368         ir_entity *ent;
 369
 370         init = skip_Id(init);
 371
 372         switch (get_irn_opcode(init)) {
 373         case iro_Cast:
 374                 do_dump_atomic_init(env, get_Cast_op(init));
 375                 return;
 376
 377         case iro_Conv:
 378                 do_dump_atomic_init(env, get_Conv_op(init));
 379                 return;
 380
 381         case iro_Const:
 382                 tv = get_Const_tarval(init);
 383
 384                 /* it's a arithmetic value */
 385                 dump_arith_tarval(tv, bytes);
 386                 return;
 387
 388         case iro_SymConst:
 389                 switch (get_SymConst_kind(init)) {
 390                 case symconst_addr_name:
 391                         be_emit_ident(get_SymConst_name(init));
 392                         break;
 393
 394                 case symconst_addr_ent:
 395                         ent = get_SymConst_entity(init);
 396                         if (!is_entity_backend_marked(ent)) {
 397                                 waitq_put(env->worklist, ent);
 398                                 set_entity_backend_marked(ent, 1);
 399                         }
 400                         be_gas_emit_entity(ent);
 401                         break;
 402
 403                 case symconst_ofs_ent:
 404                         ent = get_SymConst_entity(init);
 405                         be_emit_irprintf("%d", get_entity_offset(ent));
 406                         break;
 407
 408                 case symconst_type_size:
 409                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 410                         break;
 411
 412                 case symconst_type_align:
 413                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 414                         break;
 415
 416                 case symconst_enum_const:
 417                         tv = get_enumeration_value(get_SymConst_enum(init));
 418                         dump_arith_tarval(tv, bytes);
 419                         break;
 420
 421                 default:
 422                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 423                 }
 424                 return;
 425
 426         case iro_Add:
 427                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 428                         panic("Constant must be int or pointer for '+' to work");
 429                 }
 430                 do_dump_atomic_init(env, get_Add_left(init));
 431                 be_emit_cstring(" + ");
 432                 do_dump_atomic_init(env, get_Add_right(init));
 433                 return;
 434
 435         case iro_Sub:
 436                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 437                         panic("Constant must be int or pointer for '-' to work");
 438                 }
 439                 do_dump_atomic_init(env, get_Sub_left(init));
 440                 be_emit_cstring(" - ");
 441                 do_dump_atomic_init(env, get_Sub_right(init));
 442                 return;
 443
 444         case iro_Mul:
 445                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 446                         panic("Constant must be int or pointer for '*' to work");
 447                 }
 448                 do_dump_atomic_init(env, get_Mul_left(init));
 449                 be_emit_cstring(" * ");
 450                 do_dump_atomic_init(env, get_Mul_right(init));
 451                 return;
 452
 453         default:
 454                 panic("dump_atomic_init(): unsupported IR-node %+F", init);
 455         }
 456 }
 457
 458 /**
 459  * Dumps the type for given size (.byte, .long, ...)
 460  *
 461  * @param size  the size in bytes
 462  */
 463 static void dump_size_type(size_t size) {
 464         switch (size) {
 465         case 1:
 466                 be_emit_cstring("\t.byte\t");
 467                 break;
 468
 469         case 2:
 470                 be_emit_cstring("\t.short\t");
 471                 break;
 472
 473         case 4:
 474                 be_emit_cstring("\t.long\t");
 475                 break;
 476
 477         case 8:
 478                 be_emit_cstring("\t.quad\t");
 479                 break;
 480
 481         case 10:
 482         case 12:
 483                 /* handled in arith */
 484                 break;
 485
 486         case 16:
 487                 be_emit_cstring("\t.octa\t");
 488                 break;
 489
 490         default:
 491                 panic("Try to dump a type with %u bytes", (unsigned)size);
 492         }
 493 }
 494
 495 /**
 496  * Emit an atomic value.
 497  *
 498  * @param env   the gas output environment
 499  * @param init  a node representing the atomic value (on the const code irg)
 500  */
 501 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 502 {
 503         ir_mode *mode = get_irn_mode(init);
 504         int bytes     = get_mode_size_bytes(mode);
 505
 506         dump_size_type(bytes);
 507         do_dump_atomic_init(env, init);
 508         be_emit_char('\n');
 509         be_emit_write_line();
 510 }
 511
 512 /************************************************************************/
 513 /* Routines to dump global variables                                    */
 514 /************************************************************************/
 515
 516 static int initializer_is_string_const(const ir_initializer_t *initializer)
 517 {
 518         size_t i, len;
 519         int found_printable = 0;
 520
 521         if (initializer->kind != IR_INITIALIZER_COMPOUND)
 522                 return 0;
 523
 524         len = initializer->compound.n_initializers;
 525         if (len < 1)
 526                 return 0;
 527         for (i = 0; i < len; ++i) {
 528                 int               c;
 529                 tarval           *tv;
 530                 ir_mode          *mode;
 531                 ir_initializer_t *sub_initializer
 532                         = initializer->compound.initializers[i];
 533
 534                 if (sub_initializer->kind != IR_INITIALIZER_TARVAL)
 535                         return 0;
 536
 537                 tv   = sub_initializer->tarval.value;
 538                 mode = get_tarval_mode(tv);
 539
 540                 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
 541                         return 0;
 542
 543                 c = get_tarval_long(tv);
 544                 if (isgraph(c) || isspace(c))
 545                         found_printable = 1;
 546                 else if (c != 0)
 547                         return 0;
 548
 549                 if (i == len - 1 && c != '\0')
 550                         return 0;
 551         }
 552
 553         return found_printable;
 554 }
 555
 556 /**
 557  * Determine if an entity is a string constant
 558  * @param ent The entity
 559  * @return 1 if it is a string constant, 0 otherwise
 560  */
 561 static int ent_is_string_const(ir_entity *ent)
 562 {
 563         ir_type *type, *element_type;
 564         ir_mode *mode;
 565         int i, c, n;
 566         int found_printable = 0;
 567
 568         type = get_entity_type(ent);
 569
 570         /* if it's an array */
 571         if (!is_Array_type(type))
 572                 return 0;
 573
 574         element_type = get_array_element_type(type);
 575
 576         /* and the array's element type is primitive */
 577         if (!is_Primitive_type(element_type))
 578                 return 0;
 579
 580         /* and the mode of the element type is an int of
 581          * the same size as the byte mode */
 582         mode = get_type_mode(element_type);
 583         if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
 584                 return 0;
 585
 586         if (ent->has_initializer) {
 587                 /* TODO */
 588                 return 0;
 589         } else {
 590                 /* if it contains only printable chars and a 0 at the end */
 591                 n = get_compound_ent_n_values(ent);
 592                 for (i = 0; i < n; ++i) {
 593                         ir_node *irn = get_compound_ent_value(ent, i);
 594                         if (! is_Const(irn))
 595                                 return 0;
 596
 597                         c = (int) get_tarval_long(get_Const_tarval(irn));
 598
 599                         if (isgraph(c) || isspace(c))
 600                                 found_printable = 1;
 601                         else if (c != 0)
 602                                 return 0;
 603
 604                         if (i == n - 1 && c != '\0')
 605                                 return 0;
 606                 }
 607         }
 608
 609         /* then we can emit it as a string constant */
 610         return found_printable;
 611 }
 612
 613 /**
 614  * Dump a string constant.
 615  * No checks are made!!
 616  *
 617  * @param ent  The entity to dump.
 618  */
 619 static void dump_string_cst(ir_entity *ent)
 620 {
 621         int      i, len;
 622         int      output_len;
 623         ir_type *type;
 624         int      type_size;
 625         int      remaining_space;
 626
 627         len        = get_compound_ent_n_values(ent);
 628         output_len = len;
 629         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 630                 be_emit_cstring("\t.ascii \"");
 631         } else {
 632                 be_emit_cstring("\t.string \"");
 633                 output_len -= 1;
 634         }
 635
 636         for (i = 0; i < output_len; ++i) {
 637                 ir_node *irn;
 638                 int c;
 639
 640                 irn = get_compound_ent_value(ent, i);
 641                 c = (int) get_tarval_long(get_Const_tarval(irn));
 642
 643                 switch (c) {
 644                 case '"' : be_emit_cstring("\\\""); break;
 645                 case '\n': be_emit_cstring("\\n"); break;
 646                 case '\r': be_emit_cstring("\\r"); break;
 647                 case '\t': be_emit_cstring("\\t"); break;
 648                 case '\\': be_emit_cstring("\\\\"); break;
 649                 default  :
 650                         if (isprint(c))
 651                                 be_emit_char(c);
 652                         else
 653                                 be_emit_irprintf("\\%o", c);
 654                         break;
 655                 }
 656         }
 657         be_emit_cstring("\"\n");
 658         be_emit_write_line();
 659
 660         type            = get_entity_type(ent);
 661         type_size       = get_type_size_bytes(type);
 662         remaining_space = type_size - len;
 663         assert(remaining_space >= 0);
 664         if (remaining_space > 0) {
 665                 be_emit_irprintf("\t.space\t%d\n", remaining_space);
 666         }
 667 }
 668
 669 static void dump_string_initializer(const ir_initializer_t *initializer)
 670 {
 671         size_t i, len;
 672
 673         len = initializer->compound.n_initializers;
 674         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 675                 be_emit_cstring("\t.ascii \"");
 676         } else {
 677                 be_emit_cstring("\t.string \"");
 678                 len -= 1;
 679         }
 680
 681         for (i = 0; i < len; ++i) {
 682                 const ir_initializer_t *sub_initializer
 683                         = get_initializer_compound_value(initializer, i);
 684
 685                 tarval *tv = get_initializer_tarval_value(sub_initializer);
 686                 int     c  = get_tarval_long(tv);
 687
 688                 switch (c) {
 689                 case '"' : be_emit_cstring("\\\""); break;
 690                 case '\n': be_emit_cstring("\\n"); break;
 691                 case '\r': be_emit_cstring("\\r"); break;
 692                 case '\t': be_emit_cstring("\\t"); break;
 693                 case '\\': be_emit_cstring("\\\\"); break;
 694                 default  :
 695                         if (isprint(c))
 696                                 be_emit_char(c);
 697                         else
 698                                 be_emit_irprintf("\\%o", c);
 699                         break;
 700                 }
 701         }
 702         be_emit_cstring("\"\n");
 703         be_emit_write_line();
 704 }
 705
 706 enum normal_or_bitfield_kind {
 707         NORMAL = 0,
 708         TARVAL,
 709         BITFIELD
 710 };
 711
 712 typedef struct {
 713         enum normal_or_bitfield_kind kind;
 714         union {
 715                 ir_node       *value;
 716                 tarval        *tarval;
 717                 unsigned char  bf_val;
 718         } v;
 719 } normal_or_bitfield;
 720
 721 static int is_type_variable_size(ir_type *type)
 722 {
 723         (void) type;
 724         /* TODO */
 725         return 0;
 726 }
 727
 728 static size_t get_initializer_size(const ir_initializer_t *initializer,
 729                                    ir_type *type)
 730 {
 731         switch (get_initializer_kind(initializer)) {
 732         case IR_INITIALIZER_TARVAL: {
 733                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 734                 return get_type_size_bytes(type);
 735         }
 736         case IR_INITIALIZER_CONST:
 737         case IR_INITIALIZER_NULL:
 738                 return get_type_size_bytes(type);
 739         case IR_INITIALIZER_COMPOUND: {
 740                 if (!is_type_variable_size(type)) {
 741                         return get_type_size_bytes(type);
 742                 } else {
 743                         unsigned n_entries
 744                                 = get_initializer_compound_n_entries(initializer);
 745                         unsigned i;
 746                         unsigned initializer_size = get_type_size_bytes(type);
 747                         for (i = 0; i < n_entries; ++i) {
 748                                 ir_entity *entity = get_compound_member(type, i);
 749                                 ir_type   *type   = get_entity_type(entity);
 750
 751                                 const ir_initializer_t *sub_initializer
 752                                         = get_initializer_compound_value(initializer, i);
 753
 754                                 unsigned offset = get_entity_offset(entity);
 755                                 unsigned size   = get_initializer_size(sub_initializer, type);
 756
 757                                 if (offset + size > initializer_size) {
 758                                         initializer_size = offset + size;
 759                                 }
 760                         }
 761                         return initializer_size;
 762                 }
 763         }
 764         }
 765
 766         panic("found invalid initializer");
 767 }
 768
 769 #ifndef NDEBUG
 770 static normal_or_bitfield *glob_vals;
 771 static size_t              max_vals;
 772 #endif
 773
 774 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
 775                           const ir_initializer_t *initializer, ir_type *type)
 776 {
 777         unsigned char  last_bits = 0;
 778         ir_mode       *mode      = get_type_mode(type);
 779         tarval        *tv        = NULL;
 780         unsigned char  curr_bits;
 781         int            value_len;
 782         int            j;
 783
 784         switch (get_initializer_kind(initializer)) {
 785         case IR_INITIALIZER_NULL:
 786                 return;
 787         case IR_INITIALIZER_TARVAL:
 788                 tv = get_initializer_tarval_value(initializer);
 789                 break;
 790         case IR_INITIALIZER_CONST: {
 791                 ir_node *node = get_initializer_const_value(initializer);
 792                 if (!is_Const(node)) {
 793                         panic("bitfield initializer not a Const node");
 794                 }
 795                 tv = get_Const_tarval(node);
 796                 break;
 797         }
 798         case IR_INITIALIZER_COMPOUND:
 799                 panic("bitfield initializer is compound");
 800         }
 801         if (tv == NULL) {
 802                 panic("Couldn't get numeric value for bitfield initializer");
 803         }
 804         tv = tarval_convert_to(tv, get_type_mode(type));
 805
 806         /* normalize offset */
 807         vals        += offset_bits >> 3;
 808         offset_bits &= 7;
 809         value_len    = get_mode_size_bits(mode);
 810
 811         /* combine bits with existing bits */
 812         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 813                 assert((size_t) (vals - glob_vals) + j < max_vals);
 814                 assert(vals[j].kind == BITFIELD ||
 815                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 816                 vals[j].kind = BITFIELD;
 817                 curr_bits    = get_tarval_sub_bits(tv, j);
 818                 vals[j].v.bf_val
 819                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 820                 value_len -= 8;
 821                 last_bits = curr_bits;
 822         }
 823 }
 824
 825 static void dump_ir_initializer(normal_or_bitfield *vals,
 826                                 const ir_initializer_t *initializer,
 827                                 ir_type *type)
 828 {
 829         assert((size_t) (vals - glob_vals) < max_vals);
 830
 831         switch (get_initializer_kind(initializer)) {
 832         case IR_INITIALIZER_NULL:
 833                 return;
 834         case IR_INITIALIZER_TARVAL: {
 835                 size_t i;
 836
 837                 assert(vals->kind != BITFIELD);
 838                 vals->kind     = TARVAL;
 839                 vals->v.tarval = get_initializer_tarval_value(initializer);
 840                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 841                 for (i = 1; i < get_type_size_bytes(type); ++i) {
 842                         vals[i].kind    = NORMAL;
 843                         vals[i].v.value = NULL;
 844                 }
 845                 return;
 846         }
 847         case IR_INITIALIZER_CONST: {
 848                 size_t i;
 849
 850                 assert(vals->kind != BITFIELD);
 851                 vals->kind    = NORMAL;
 852                 vals->v.value = get_initializer_const_value(initializer);
 853                 for (i = 1; i < get_type_size_bytes(type); ++i) {
 854                         vals[i].kind    = NORMAL;
 855                         vals[i].v.value = NULL;
 856                 }
 857                 return;
 858         }
 859         case IR_INITIALIZER_COMPOUND: {
 860                 size_t i = 0;
 861                 size_t n = get_initializer_compound_n_entries(initializer);
 862
 863                 if (is_Array_type(type)) {
 864                         ir_type *element_type = get_array_element_type(type);
 865                         size_t   skip         = get_type_size_bytes(element_type);
 866                         size_t   alignment    = get_type_alignment_bytes(element_type);
 867                         size_t   misalign     = skip % alignment;
 868                         if (misalign != 0) {
 869                                 skip += alignment - misalign;
 870                         }
 871
 872                         for (i = 0; i < n; ++i) {
 873                                 ir_initializer_t *sub_initializer
 874                                         = get_initializer_compound_value(initializer, i);
 875
 876                                 dump_ir_initializer(vals, sub_initializer, element_type);
 877
 878                                 vals += skip;
 879                         }
 880                 } else {
 881                         size_t n_members, i;
 882                         assert(is_compound_type(type));
 883                         n_members = get_compound_n_members(type);
 884                         for (i = 0; i < n_members; ++i) {
 885                                 ir_entity        *member    = get_compound_member(type, i);
 886                                 size_t            offset    = get_entity_offset(member);
 887                                 ir_type          *subtype   = get_entity_type(member);
 888                                 ir_mode          *mode      = get_type_mode(subtype);
 889                                 ir_initializer_t *sub_initializer;
 890
 891                                 assert(i < get_initializer_compound_n_entries(initializer));
 892                                 sub_initializer
 893                                         = get_initializer_compound_value(initializer, i);
 894
 895                                 if (mode != NULL) {
 896                                         size_t offset_bits
 897                                                 = get_entity_offset_bits_remainder(member);
 898                                         size_t value_len   = get_mode_size_bits(mode);
 899
 900                                         if (offset_bits != 0 ||
 901                                                 (value_len != 8 && value_len != 16 && value_len != 32
 902                                                  && value_len != 64)) {
 903                                                 dump_bitfield(&vals[offset], offset_bits,
 904                                                               sub_initializer, subtype);
 905                                                 continue;
 906                                         }
 907                                 }
 908
 909                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 910                         }
 911                 }
 912
 913                 return;
 914         }
 915         }
 916         panic("invalid ir_initializer kind found");
 917 }
 918
 919 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 920 {
 921         const ir_initializer_t *initializer = entity->attr.initializer;
 922         ir_type                *type;
 923         normal_or_bitfield     *vals;
 924         size_t                  size;
 925         size_t                  k;
 926
 927         if (initializer_is_string_const(initializer)) {
 928                 dump_string_initializer(initializer);
 929                 return;
 930         }
 931
 932         type = get_entity_type(entity);
 933         size = get_initializer_size(initializer, type);
 934
 935         if (size == 0)
 936                 return;
 937
 938         /*
 939          * In the worst case, every initializer allocates one byte.
 940          * Moreover, initializer might be big, do not allocate on stack.
 941          */
 942         vals = XMALLOCNZ(normal_or_bitfield, size);
 943
 944 #ifndef NDEBUG
 945         glob_vals = vals;
 946         max_vals  = size;
 947 #endif
 948
 949         dump_ir_initializer(vals, initializer, type);
 950
 951         /* now write values sorted */
 952         for (k = 0; k < size; ) {
 953                 int space     = 0;
 954                 int elem_size = 1;
 955                 if (vals[k].kind == NORMAL) {
 956                         if (vals[k].v.value != NULL) {
 957                                 dump_atomic_init(env, vals[k].v.value);
 958                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
 959                         } else {
 960                                 elem_size = 0;
 961                         }
 962                 } else if (vals[k].kind == TARVAL) {
 963                         tarval *tv   = vals[k].v.tarval;
 964                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 965
 966                         assert(tv != NULL);
 967
 968                         elem_size = size;
 969                         dump_size_type(size);
 970                         dump_arith_tarval(tv, size);
 971                         be_emit_char('\n');
 972                         be_emit_write_line();
 973                 } else {
 974                         assert(vals[k].kind == BITFIELD);
 975                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 976                         be_emit_write_line();
 977                 }
 978
 979                 k += elem_size;
 980                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 981                         ++space;
 982                         ++k;
 983                 }
 984
 985                 /* a gap */
 986                 if (space > 0) {
 987                         be_emit_irprintf("\t.space\t%d\n", space);
 988                         be_emit_write_line();
 989                 }
 990         }
 991         xfree(vals);
 992 }
 993
 994 /**
 995  * Dump an initializer for a compound entity.
 996  */
 997 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
 998 {
 999         normal_or_bitfield *vals;
1000         int i, j, n;
1001         unsigned k, last_ofs;
1002
1003         if (ent->has_initializer) {
1004                 dump_initializer(env, ent);
1005                 return;
1006         }
1007
1008         n = get_compound_ent_n_values(ent);
1009
1010         /* Find the initializer size. Sorrily gcc support a nasty feature:
1011            The last field of a compound may be a flexible array. This allows
1012            initializers bigger than the type size. */
1013         last_ofs = get_type_size_bytes(get_entity_type(ent));
1014         for (i = 0; i < n; ++i) {
1015                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1016                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1017                 ir_node  *value         = get_compound_ent_value(ent, i);
1018                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1019
1020                 offset += (value_len + bits_remainder + 7) >> 3;
1021
1022                 if (offset > last_ofs) {
1023                         last_ofs = offset;
1024                 }
1025         }
1026
1027         /*
1028          * In the worst case, every initializer allocates one byte.
1029          * Moreover, initializer might be big, do not allocate on stack.
1030          */
1031         vals = XMALLOCNZ(normal_or_bitfield, last_ofs);
1032
1033         /* collect the values and store them at the offsets */
1034         for (i = 0; i < n; ++i) {
1035                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1036                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1037                 ir_node  *value      = get_compound_ent_value(ent, i);
1038                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1039
1040                 assert(offset_bits >= 0);
1041
1042                 if (offset_bits != 0 ||
1043                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1044                         tarval *tv = get_atomic_init_tv(value);
1045                         unsigned char curr_bits, last_bits = 0;
1046                         if (tv == NULL) {
1047                                 panic("Couldn't get numeric value for bitfield initializer '%s'",
1048                                       get_entity_ld_name(ent));
1049                         }
1050                         /* normalize offset */
1051                         offset += offset_bits >> 3;
1052                         offset_bits &= 7;
1053
1054                         for (j = 0; value_len + offset_bits > 0; ++j) {
1055                                 assert(offset + j < last_ofs);
1056                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1057                                 vals[offset + j].kind = BITFIELD;
1058                                 curr_bits = get_tarval_sub_bits(tv, j);
1059                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1060                                 value_len -= 8;
1061                                 last_bits = curr_bits;
1062                         }
1063                 } else {
1064                         int i;
1065
1066                         assert(offset < last_ofs);
1067                         assert(vals[offset].kind == NORMAL);
1068                         for (i = 1; i < value_len / 8; ++i) {
1069                                 assert(vals[offset + i].v.value == NULL);
1070                         }
1071                         vals[offset].v.value = value;
1072                 }
1073         }
1074
1075         /* now write them sorted */
1076         for (k = 0; k < last_ofs; ) {
1077                 int space = 0, skip = 0;
1078                 if (vals[k].kind == NORMAL) {
1079                         if (vals[k].v.value != NULL) {
1080                                 dump_atomic_init(env, vals[k].v.value);
1081                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1082                         } else {
1083                                 space = 1;
1084                         }
1085                 } else {
1086                         assert(vals[k].kind == BITFIELD);
1087                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1088                 }
1089
1090                 ++k;
1091                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1092                         ++space;
1093                         ++k;
1094                 }
1095                 space -= skip;
1096                 assert(space >= 0);
1097
1098                 /* a gap */
1099                 if (space > 0) {
1100                         be_emit_irprintf("\t.space\t%d\n", space);
1101                         be_emit_write_line();
1102                 }
1103         }
1104         xfree(vals);
1105 }
1106
1107 static void emit_align(unsigned p2alignment)
1108 {
1109         be_emit_irprintf("\t.p2align\t%u\n", log2_floor(p2alignment));
1110         be_emit_write_line();
1111 }
1112
1113 static unsigned get_effective_entity_alignment(ir_entity *entity)
1114 {
1115         unsigned alignment = get_entity_alignment(entity);
1116         if (alignment == 0) {
1117                 ir_type *type = get_entity_type(entity);
1118                 alignment     = get_type_alignment_bytes(type);
1119         }
1120         return alignment;
1121 }
1122
1123
1124 /**
1125  * Dump a global entity.
1126  *
1127  * @param env           the gas output environment
1128  * @param ent           the entity to be dumped
1129  */
1130 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1131 {
1132         ir_type          *type           = get_entity_type(ent);
1133         ident            *ld_ident       = get_entity_ld_ident(ent);
1134         unsigned          alignment      = get_effective_entity_alignment(ent);
1135         int               emit_as_common = 0;
1136         be_gas_section_t  section        = env->section;
1137         ir_variability    variability    = get_entity_variability(ent);
1138         ir_visibility     visibility     = get_entity_visibility(ent);
1139
1140         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1141                 return;
1142         }
1143         if (type == firm_code_type) {
1144                 return;
1145         }
1146
1147         if (section != (be_gas_section_t) -1) {
1148                 emit_as_common = 0;
1149         } else if (variability == variability_constant) {
1150                 /* a constant entity, put it on the rdata */
1151                 section = GAS_SECTION_RODATA;
1152                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1153                                 && ent_is_string_const(ent)) {
1154                         section = GAS_SECTION_CSTRING;
1155                 }
1156         } else if (variability == variability_uninitialized) {
1157                 /* uninitialized entity put it in bss segment */
1158                 section = GAS_SECTION_COMMON;
1159                 if (visibility != visibility_local)
1160                         emit_as_common = 1;
1161         } else {
1162                 section = GAS_SECTION_DATA;
1163         }
1164
1165         if (!emit_as_common) {
1166                 be_gas_emit_switch_section(section);
1167         }
1168
1169         be_dbg_variable(ent);
1170
1171         /* global or not global */
1172         if (visibility == visibility_external_visible && !emit_as_common) {
1173                 be_emit_cstring(".globl\t");
1174                 be_emit_ident(ld_ident);
1175                 be_emit_char('\n');
1176                 be_emit_write_line();
1177         } else if (visibility == visibility_external_allocated) {
1178                 be_emit_cstring(".globl\t");
1179                 be_emit_ident(ld_ident);
1180                 be_emit_char('\n');
1181                 be_emit_write_line();
1182                 /* we can return now... */
1183                 return;
1184         }
1185         if (!is_po2(alignment))
1186                 panic("alignment not a power of 2");
1187         /* alignment */
1188         if (alignment > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1189                         && section != GAS_SECTION_PIC_SYMBOLS) {
1190                 emit_align(alignment);
1191         }
1192
1193         if (visibility != visibility_external_allocated && !emit_as_common
1194                         && be_gas_flavour == GAS_FLAVOUR_ELF
1195                         && be_gas_emit_types) {
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_MACH_O:
1213                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1214                                         get_id_str(ld_ident), get_type_size_bytes(type),
1215                                         log2_floor(alignment));
1216                                 break;
1217                         case GAS_FLAVOUR_ELF:
1218                         case GAS_FLAVOUR_YASM:
1219                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1220                                         get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1221                                 be_emit_write_line();
1222                                 break;
1223                         case GAS_FLAVOUR_MINGW:
1224                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1225                                         get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1226                                 be_emit_write_line();
1227                                 break;
1228                         }
1229                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES
1230                                 || section == GAS_SECTION_PIC_SYMBOLS) {
1231                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1232                                 be_emit_cstring("\t.indirect_symbol ");
1233                                 be_emit_ident(get_entity_ident(ent));
1234                                 be_emit_char('\n');
1235                                 be_emit_write_line();
1236                                 if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1237                                         be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1238                                         be_emit_write_line();
1239                                 } else {
1240                                         assert(section == GAS_SECTION_PIC_SYMBOLS);
1241                                         be_emit_cstring("\t.long 0\n");
1242                                         be_emit_write_line();
1243                                 }
1244                         } else {
1245                                 panic("PIC trampolines not yet supported in this gas mode");
1246                         }
1247                 } else {
1248                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1249                         be_emit_write_line();
1250                 }
1251         } else {
1252                 if (is_atomic_entity(ent)) {
1253                         dump_atomic_init(env, get_atomic_ent_value(ent));
1254                 } else {
1255                         /* sort_compound_ent_values(ent); */
1256
1257                         switch (get_type_tpop_code(get_entity_type(ent))) {
1258                         case tpo_array:
1259                                 if (ent_is_string_const(ent))
1260                                         dump_string_cst(ent);
1261                                 else
1262                                         dump_compound_init(env, ent);
1263                                 break;
1264                         case tpo_struct:
1265                         case tpo_class:
1266                         case tpo_union:
1267                                 dump_compound_init(env, ent);
1268                                 break;
1269                         default:
1270                                 panic("Unimplemented type kind in dump_global()");
1271                         }
1272                 }
1273         }
1274 }
1275
1276 /**
1277  * Dumps declarations of global variables and the initialization code.
1278  *
1279  * @param gt                a global like type, either the global or the TLS one
1280  * @param env               an environment
1281  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1282  *                          its visited flag set are ignored
1283  */
1284 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1285                                 int only_emit_marked)
1286 {
1287         int i, n = get_compound_n_members(gt);
1288         waitq *worklist = new_waitq();
1289
1290         if (only_emit_marked) {
1291                 for (i = 0; i < n; i++) {
1292                         ir_entity *ent = get_compound_member(gt, i);
1293                         if (is_entity_backend_marked(ent) ||
1294                             get_entity_visibility(ent) != visibility_external_allocated) {
1295                                 waitq_put(worklist, ent);
1296                                 set_entity_backend_marked(ent, 1);
1297                         }
1298                 }
1299         } else {
1300                 for (i = 0; i < n; i++) {
1301                         ir_entity *ent = get_compound_member(gt, i);
1302                         set_entity_backend_marked(ent, 1);
1303                         waitq_put(worklist, ent);
1304                 }
1305         }
1306
1307         env->worklist = worklist;
1308
1309         while (!waitq_empty(worklist)) {
1310                 ir_entity *ent = waitq_get(worklist);
1311
1312                 dump_global(env, ent);
1313         }
1314
1315         del_waitq(worklist);
1316         env->worklist = NULL;
1317 }
1318
1319 /************************************************************************/
1320
1321 /* Generate all entities. */
1322 void be_gas_emit_decls(const be_main_env_t *main_env,
1323                        int only_emit_marked_entities)
1324 {
1325         be_gas_decl_env_t env;
1326         memset(&env, 0, sizeof(env));
1327
1328         /* dump global type */
1329         env.section = (be_gas_section_t) -1;
1330         be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1331         env.section = GAS_SECTION_TLS;
1332         be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1333         env.section = GAS_SECTION_CONSTRUCTORS;
1334         be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1335                             only_emit_marked_entities);
1336         env.section = GAS_SECTION_DESTRUCTORS;
1337         be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1338                             only_emit_marked_entities);
1339
1340         env.section = GAS_SECTION_PIC_SYMBOLS;
1341         be_gas_dump_globals(main_env->pic_symbols_type, &env,
1342                             only_emit_marked_entities);
1343
1344         if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1345                 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1346                 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1347                                     only_emit_marked_entities);
1348                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1349                         be_emit_cstring("\t.subsections_via_symbols\n");
1350                         be_emit_write_line();
1351                 }
1352         }
1353 }