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
  51 static be_gas_section_t current_section = (be_gas_section_t) -1;
  52
  53 /**
  54  * Return the pseudo-instruction to be issued for a section switch
  55  * depending on the current flavour.
  56  *
  57  * @param section  the section to switch to
  58  *
  59  * @return  the pseudo-instruction
  60  */
  61 static const char *get_section_name(be_gas_section_t section) {
  62         static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
  63                 { /* GAS_FLAVOUR_ELF */
  64                         ".section\t.text",
  65                         ".section\t.data",
  66                         ".section\t.rodata",
  67                         ".section\t.bss",
  68                         ".section\t.tbss,\"awT\",@nobits",
  69                         ".section\t.ctors,\"aw\",@progbits",
  70                         ".section\t.dtors,\"aw\",@progbits",
  71                         NULL, /* no cstring section */
  72                         NULL,
  73                         NULL
  74                 },
  75                 { /* GAS_FLAVOUR_MINGW */
  76                         ".section\t.text",
  77                         ".section\t.data",
  78                         ".section .rdata,\"dr\"",
  79                         ".section\t.bss",
  80                         ".section\t.tbss,\"awT\",@nobits",
  81                         ".section\t.ctors,\"w\"",
  82                         ".section\t.dtors,\"w\"",
  83                         NULL,
  84                         NULL,
  85                         NULL
  86                 },
  87                 { /* GAS_FLAVOUR_YASM */
  88                         ".section\t.text",
  89                         ".section\t.data",
  90                         ".section\t.rodata",
  91                         ".section\t.bss",
  92                         ".section\t.tbss,\"awT\",@nobits",
  93                         ".section\t.ctors,\"aw\",@progbits",
  94                         ".section\t.dtors,\"aw\",@progbits",
  95                         NULL,
  96                         NULL,
  97                         NULL
  98                 },
  99                 { /* GAS_FLAVOUR_MACH_O */
 100                         ".text",
 101                         ".data",
 102                         ".const",
 103                         ".data",
 104                         NULL,             /* TLS is not supported on Mach-O */
 105                         ".mod_init_func",
 106                         NULL,             /* TODO: how is this called? */
 107                         ".cstring",
 108                         ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
 109                         ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
 110                 }
 111         };
 112
 113         assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
 114         assert((int) section >= 0 && section <= GAS_SECTION_LAST);
 115         return text[be_gas_flavour][section];
 116 }
 117
 118 void be_gas_emit_switch_section(be_gas_section_t section) {
 119         if (current_section == section)
 120                 return;
 121
 122         be_emit_char('\t');
 123         be_emit_string(get_section_name(section));
 124         be_emit_char('\n');
 125         be_emit_write_line();
 126         current_section = section;
 127 }
 128
 129 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
 130 {
 131         const char *name = get_entity_ld_name(entity);
 132         const char *fill_byte = "";
 133         unsigned maximum_skip;
 134
 135         be_gas_emit_switch_section(GAS_SECTION_TEXT);
 136
 137         /* write the begin line (used by scripts processing the assembler... */
 138         be_emit_write_line();
 139         be_emit_cstring("# -- Begin  ");
 140         be_emit_string(name);
 141         be_emit_char('\n');
 142         be_emit_write_line();
 143
 144         /* gcc fills space between function with 0x90, no idea if this is needed */
 145         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 146                 fill_byte = "0x90";
 147         }
 148
 149         if (alignment > 0) {
 150                 maximum_skip = (1 << alignment) - 1;
 151                 be_emit_cstring("\t.p2align ");
 152                 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
 153                 be_emit_write_line();
 154         }
 155         if (get_entity_visibility(entity) == visibility_external_visible) {
 156                 be_emit_cstring(".globl ");
 157                 be_emit_string(name);
 158                 be_emit_char('\n');
 159                 be_emit_write_line();
 160         }
 161
 162         switch (be_gas_flavour) {
 163         case GAS_FLAVOUR_ELF:
 164                 be_emit_cstring("\t.type\t");
 165                 be_emit_string(name);
 166                 be_emit_cstring(", @function\n");
 167                 be_emit_write_line();
 168                 break;
 169         case GAS_FLAVOUR_MINGW:
 170                 be_emit_cstring("\t.def\t");
 171                 be_emit_string(name);
 172                 if (get_entity_visibility(entity) == visibility_external_visible) {
 173                         be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
 174                 } else {
 175                         be_emit_cstring(";\t.scl\t3;\t.type\t32;\t.endef\n");
 176                 }
 177                 be_emit_write_line();
 178                 break;
 179         case GAS_FLAVOUR_MACH_O:
 180         case GAS_FLAVOUR_YASM:
 181                 break;
 182         }
 183         be_emit_string(name);
 184         be_emit_cstring(":\n");
 185         be_emit_write_line();
 186 }
 187
 188 void be_gas_emit_function_epilog(ir_entity *entity)
 189 {
 190         const char *name = get_entity_ld_name(entity);
 191
 192         if (be_gas_flavour == GAS_FLAVOUR_ELF) {
 193                 be_emit_cstring("\t.size\t");
 194                 be_emit_string(name);
 195                 be_emit_cstring(", .-");
 196                 be_emit_string(name);
 197                 be_emit_char('\n');
 198                 be_emit_write_line();
 199         }
 200
 201         be_emit_cstring("# -- End  ");
 202         be_emit_string(name);
 203         be_emit_char('\n');
 204         be_emit_write_line();
 205 }
 206
 207 /**
 208  * An environment containing all needed dumper data.
 209  * Currently we create the file completely in memory first, then
 210  * write it to the disk. This is an artifact from the old C-generating backend
 211  * and even there NOT needed. So we might change it in the future.
 212  */
 213 typedef struct _be_gas_decl_env {
 214         be_gas_section_t     section;
 215         waitq               *worklist;           /**< A worklist we use to place not yet handled entities on. */
 216 } be_gas_decl_env_t;
 217
 218 /************************************************************************/
 219
 220 /**
 221  * Output a tarval.
 222  *
 223  * @param tv     the tarval
 224  * @param bytes  the width of the tarvals value in bytes
 225  */
 226 static void dump_arith_tarval(tarval *tv, int bytes)
 227 {
 228         switch (bytes) {
 229         case 1:
 230                 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
 231                 return;
 232
 233         case 2:
 234                 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 235                 return;
 236
 237         case 4:
 238                 be_emit_irprintf("0x%02x%02x%02x%02x",
 239                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 240                 return;
 241
 242         case 8:
 243                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
 244                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 245                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 246                 return;
 247
 248         case 12:
 249                 /* Beware: Mixed endian output!  One little endian number emitted as
 250                  * three longs.  Each long initializer is written in big endian. */
 251                 be_emit_irprintf(
 252                         "\t.long\t0x%02x%02x%02x%02x\n"
 253                         "\t.long\t0x%02x%02x%02x%02x\n"
 254                         "\t.long\t0x%02x%02x%02x%02x",
 255                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 256                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0),
 257                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 258                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 259                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 260                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8)
 261                 );
 262                 return;
 263
 264         case 16:
 265                 be_emit_irprintf(
 266                         "\t.long\t0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x",
 267                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 268                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 269                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 270                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8),
 271                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 272                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 273                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 274                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0)
 275                 );
 276                 return;
 277         }
 278
 279         panic("Can't dump a tarval with %d bytes", bytes);
 280 }
 281
 282 /**
 283  * Return the label prefix for labeled blocks.
 284  */
 285 const char *be_gas_block_label_prefix(void) {
 286         return ".LG";
 287 }
 288
 289 /**
 290  * Return the label prefix for labeled instructions.
 291  */
 292 const char *be_gas_insn_label_prefix(void) {
 293         return ".LE";
 294 }
 295
 296 void be_gas_emit_entity(ir_entity *entity)
 297 {
 298         if (entity->type == firm_code_type) {
 299                 ir_label_t label = get_entity_label(entity);
 300                 be_emit_string(be_gas_block_label_prefix());
 301                 be_emit_irprintf("%lu", label);
 302         } else {
 303                 be_emit_ident(get_entity_ld_ident(entity));
 304         }
 305 }
 306
 307 /**
 308  * Return the tarval of an atomic initializer.
 309  *
 310  * @param init  a node representing the initializer (on the const code irg)
 311  *
 312  * @return the tarval
 313  */
 314 static tarval *get_atomic_init_tv(ir_node *init)
 315 {
 316         for (;;) {
 317                 ir_mode *mode = get_irn_mode(init);
 318
 319                 switch (get_irn_opcode(init)) {
 320
 321                 case iro_Cast:
 322                         init = get_Cast_op(init);
 323                         continue;
 324
 325                 case iro_Conv:
 326                         init = get_Conv_op(init);
 327                         continue;
 328
 329                 case iro_Const:
 330                         return get_Const_tarval(init);
 331
 332                 case iro_SymConst:
 333                         switch (get_SymConst_kind(init)) {
 334                         case symconst_type_size:
 335                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 336
 337                         case symconst_type_align:
 338                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 339
 340                         case symconst_ofs_ent:
 341                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 342
 343                         case symconst_enum_const:
 344                                 return get_enumeration_value(get_SymConst_enum(init));
 345
 346                         default:
 347                                 return NULL;
 348                         }
 349
 350                 default:
 351                         return NULL;
 352                 }
 353         }
 354 }
 355
 356 /**
 357  * Dump an atomic value.
 358  *
 359  * @param env   the gas output environment
 360  * @param init  a node representing the atomic value (on the const code irg)
 361  */
 362 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 363 {
 364         ir_mode *mode = get_irn_mode(init);
 365         int bytes     = get_mode_size_bytes(mode);
 366         tarval *tv;
 367         ir_entity *ent;
 368
 369         init = skip_Id(init);
 370
 371         switch (get_irn_opcode(init)) {
 372         case iro_Cast:
 373                 do_dump_atomic_init(env, get_Cast_op(init));
 374                 return;
 375
 376         case iro_Conv:
 377                 do_dump_atomic_init(env, get_Conv_op(init));
 378                 return;
 379
 380         case iro_Const:
 381                 tv = get_Const_tarval(init);
 382
 383                 /* it's a arithmetic value */
 384                 dump_arith_tarval(tv, bytes);
 385                 return;
 386
 387         case iro_SymConst:
 388                 switch (get_SymConst_kind(init)) {
 389                 case symconst_addr_name:
 390                         be_emit_ident(get_SymConst_name(init));
 391                         break;
 392
 393                 case symconst_addr_ent:
 394                         ent = get_SymConst_entity(init);
 395                         if (!is_entity_backend_marked(ent)) {
 396                                 waitq_put(env->worklist, ent);
 397                                 set_entity_backend_marked(ent, 1);
 398                         }
 399                         be_gas_emit_entity(ent);
 400                         break;
 401
 402                 case symconst_ofs_ent:
 403                         ent = get_SymConst_entity(init);
 404                         be_emit_irprintf("%d", get_entity_offset(ent));
 405                         break;
 406
 407                 case symconst_type_size:
 408                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 409                         break;
 410
 411                 case symconst_type_align:
 412                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 413                         break;
 414
 415                 case symconst_enum_const:
 416                         tv = get_enumeration_value(get_SymConst_enum(init));
 417                         dump_arith_tarval(tv, bytes);
 418                         break;
 419
 420                 default:
 421                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 422                 }
 423                 return;
 424
 425         case iro_Add:
 426                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 427                         panic("Constant must be int or pointer for '+' to work");
 428                 }
 429                 do_dump_atomic_init(env, get_Add_left(init));
 430                 be_emit_cstring(" + ");
 431                 do_dump_atomic_init(env, get_Add_right(init));
 432                 return;
 433
 434         case iro_Sub:
 435                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 436                         panic("Constant must be int or pointer for '-' to work");
 437                 }
 438                 do_dump_atomic_init(env, get_Sub_left(init));
 439                 be_emit_cstring(" - ");
 440                 do_dump_atomic_init(env, get_Sub_right(init));
 441                 return;
 442
 443         case iro_Mul:
 444                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 445                         panic("Constant must be int or pointer for '*' to work");
 446                 }
 447                 do_dump_atomic_init(env, get_Mul_left(init));
 448                 be_emit_cstring(" * ");
 449                 do_dump_atomic_init(env, get_Mul_right(init));
 450                 return;
 451
 452         default:
 453                 panic("dump_atomic_init(): unsupported IR-node %+F", init);
 454         }
 455 }
 456
 457 /**
 458  * Dumps the type for given size (.byte, .long, ...)
 459  *
 460  * @param size  the size in bytes
 461  */
 462 static void dump_size_type(size_t size) {
 463         switch (size) {
 464         case 1:
 465                 be_emit_cstring("\t.byte\t");
 466                 break;
 467
 468         case 2:
 469                 be_emit_cstring("\t.word\t");
 470                 break;
 471
 472         case 4:
 473                 be_emit_cstring("\t.long\t");
 474                 break;
 475
 476         case 8:
 477                 be_emit_cstring("\t.quad\t");
 478                 break;
 479
 480         case 10:
 481         case 12:
 482                 /* handled in arith */
 483                 break;
 484
 485         case 16:
 486                 be_emit_cstring("\t.octa\t");
 487                 break;
 488
 489         default:
 490                 panic("Try to dump a type with %u bytes", (unsigned)size);
 491         }
 492 }
 493
 494 /**
 495  * Emit an atomic value.
 496  *
 497  * @param env   the gas output environment
 498  * @param init  a node representing the atomic value (on the const code irg)
 499  */
 500 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 501 {
 502         ir_mode *mode = get_irn_mode(init);
 503         int bytes     = get_mode_size_bytes(mode);
 504
 505         dump_size_type(bytes);
 506         do_dump_atomic_init(env, init);
 507         be_emit_char('\n');
 508         be_emit_write_line();
 509 }
 510
 511 /************************************************************************/
 512 /* Routines to dump global variables                                    */
 513 /************************************************************************/
 514
 515 static int initializer_is_string_const(const ir_initializer_t *initializer)
 516 {
 517         size_t i, len;
 518         int found_printable = 0;
 519
 520         if (initializer->kind != IR_INITIALIZER_COMPOUND)
 521                 return 0;
 522
 523         len = initializer->compound.n_initializers;
 524         if (len < 1)
 525                 return 0;
 526         for (i = 0; i < len; ++i) {
 527                 int               c;
 528                 tarval           *tv;
 529                 ir_mode          *mode;
 530                 ir_initializer_t *sub_initializer
 531                         = initializer->compound.initializers[i];
 532
 533                 if (sub_initializer->kind != IR_INITIALIZER_TARVAL)
 534                         return 0;
 535
 536                 tv   = sub_initializer->tarval.value;
 537                 mode = get_tarval_mode(tv);
 538
 539                 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
 540                         return 0;
 541
 542                 c = get_tarval_long(tv);
 543                 if (isgraph(c) || isspace(c))
 544                         found_printable = 1;
 545                 else if (c != 0)
 546                         return 0;
 547
 548                 if (i == len - 1 && c != '\0')
 549                         return 0;
 550         }
 551
 552         return found_printable;
 553 }
 554
 555 /**
 556  * Determine if an entity is a string constant
 557  * @param ent The entity
 558  * @return 1 if it is a string constant, 0 otherwise
 559  */
 560 static int ent_is_string_const(ir_entity *ent)
 561 {
 562         ir_type *type, *element_type;
 563         ir_mode *mode;
 564         int i, c, n;
 565         int found_printable = 0;
 566
 567         type = get_entity_type(ent);
 568
 569         /* if it's an array */
 570         if (!is_Array_type(type))
 571                 return 0;
 572
 573         element_type = get_array_element_type(type);
 574
 575         /* and the array's element type is primitive */
 576         if (!is_Primitive_type(element_type))
 577                 return 0;
 578
 579         /* and the mode of the element type is an int of
 580          * the same size as the byte mode */
 581         mode = get_type_mode(element_type);
 582         if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
 583                 return 0;
 584
 585         if (ent->has_initializer) {
 586                 /* TODO */
 587                 return 0;
 588         } else {
 589                 /* if it contains only printable chars and a 0 at the end */
 590                 n = get_compound_ent_n_values(ent);
 591                 for (i = 0; i < n; ++i) {
 592                         ir_node *irn = get_compound_ent_value(ent, i);
 593                         if (! is_Const(irn))
 594                                 return 0;
 595
 596                         c = (int) get_tarval_long(get_Const_tarval(irn));
 597
 598                         if (isgraph(c) || isspace(c))
 599                                 found_printable = 1;
 600                         else if (c != 0)
 601                                 return 0;
 602
 603                         if (i == n - 1 && c != '\0')
 604                                 return 0;
 605                 }
 606         }
 607
 608         /* then we can emit it as a string constant */
 609         return found_printable;
 610 }
 611
 612 /**
 613  * Dump a string constant.
 614  * No checks are made!!
 615  *
 616  * @param ent  The entity to dump.
 617  */
 618 static void dump_string_cst(ir_entity *ent)
 619 {
 620         int      i, len;
 621         int      output_len;
 622         ir_type *type;
 623         int      type_size;
 624         int      remaining_space;
 625
 626         len        = get_compound_ent_n_values(ent);
 627         output_len = len;
 628         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 629                 be_emit_cstring("\t.ascii \"");
 630         } else {
 631                 be_emit_cstring("\t.string \"");
 632                 output_len -= 1;
 633         }
 634
 635         for (i = 0; i < output_len; ++i) {
 636                 ir_node *irn;
 637                 int c;
 638
 639                 irn = get_compound_ent_value(ent, i);
 640                 c = (int) get_tarval_long(get_Const_tarval(irn));
 641
 642                 switch (c) {
 643                 case '"' : be_emit_cstring("\\\""); break;
 644                 case '\n': be_emit_cstring("\\n"); break;
 645                 case '\r': be_emit_cstring("\\r"); break;
 646                 case '\t': be_emit_cstring("\\t"); break;
 647                 case '\\': be_emit_cstring("\\\\"); break;
 648                 default  :
 649                         if (isprint(c))
 650                                 be_emit_char(c);
 651                         else
 652                                 be_emit_irprintf("\\%o", c);
 653                         break;
 654                 }
 655         }
 656         be_emit_cstring("\"\n");
 657         be_emit_write_line();
 658
 659         type            = get_entity_type(ent);
 660         type_size       = get_type_size_bytes(type);
 661         remaining_space = type_size - len;
 662         assert(remaining_space >= 0);
 663         if (remaining_space > 0) {
 664                 be_emit_irprintf("\t.space\t%d\n", remaining_space);
 665         }
 666 }
 667
 668 static void dump_string_initializer(const ir_initializer_t *initializer)
 669 {
 670         size_t i, len;
 671
 672         len = initializer->compound.n_initializers;
 673         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 674                 be_emit_cstring("\t.ascii \"");
 675         } else {
 676                 be_emit_cstring("\t.string \"");
 677                 len -= 1;
 678         }
 679
 680         for (i = 0; i < len; ++i) {
 681                 const ir_initializer_t *sub_initializer
 682                         = get_initializer_compound_value(initializer, i);
 683
 684                 tarval *tv = get_initializer_tarval_value(sub_initializer);
 685                 int     c  = get_tarval_long(tv);
 686
 687                 switch (c) {
 688                 case '"' : be_emit_cstring("\\\""); break;
 689                 case '\n': be_emit_cstring("\\n"); break;
 690                 case '\r': be_emit_cstring("\\r"); break;
 691                 case '\t': be_emit_cstring("\\t"); break;
 692                 case '\\': be_emit_cstring("\\\\"); break;
 693                 default  :
 694                         if (isprint(c))
 695                                 be_emit_char(c);
 696                         else
 697                                 be_emit_irprintf("\\%o", c);
 698                         break;
 699                 }
 700         }
 701         be_emit_cstring("\"\n");
 702         be_emit_write_line();
 703 }
 704
 705 enum normal_or_bitfield_kind {
 706         NORMAL = 0,
 707         TARVAL,
 708         BITFIELD
 709 };
 710
 711 typedef struct {
 712         enum normal_or_bitfield_kind kind;
 713         union {
 714                 ir_node       *value;
 715                 tarval        *tarval;
 716                 unsigned char  bf_val;
 717         } v;
 718 } normal_or_bitfield;
 719
 720 static int is_type_variable_size(ir_type *type)
 721 {
 722         (void) type;
 723         /* TODO */
 724         return 0;
 725 }
 726
 727 static size_t get_initializer_size(const ir_initializer_t *initializer,
 728                                    ir_type *type)
 729 {
 730         switch (get_initializer_kind(initializer)) {
 731         case IR_INITIALIZER_TARVAL: {
 732                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 733                 return get_type_size_bytes(type);
 734         }
 735         case IR_INITIALIZER_CONST:
 736         case IR_INITIALIZER_NULL:
 737                 return get_type_size_bytes(type);
 738         case IR_INITIALIZER_COMPOUND: {
 739                 if (!is_type_variable_size(type)) {
 740                         return get_type_size_bytes(type);
 741                 } else {
 742                         unsigned n_entries
 743                                 = get_initializer_compound_n_entries(initializer);
 744                         unsigned i;
 745                         unsigned initializer_size = get_type_size_bytes(type);
 746                         for (i = 0; i < n_entries; ++i) {
 747                                 ir_entity *entity = get_compound_member(type, i);
 748                                 ir_type   *type   = get_entity_type(entity);
 749
 750                                 const ir_initializer_t *sub_initializer
 751                                         = get_initializer_compound_value(initializer, i);
 752
 753                                 unsigned offset = get_entity_offset(entity);
 754                                 unsigned size   = get_initializer_size(sub_initializer, type);
 755
 756                                 if (offset + size > initializer_size) {
 757                                         initializer_size = offset + size;
 758                                 }
 759                         }
 760                         return initializer_size;
 761                 }
 762         }
 763         }
 764
 765         panic("found invalid initializer");
 766 }
 767
 768 #ifndef NDEBUG
 769 static normal_or_bitfield *glob_vals;
 770 static size_t              max_vals;
 771 #endif
 772
 773 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
 774                           const ir_initializer_t *initializer, ir_type *type)
 775 {
 776         unsigned char  last_bits = 0;
 777         ir_mode       *mode      = get_type_mode(type);
 778         tarval        *tv        = NULL;
 779         unsigned char  curr_bits;
 780         int            value_len;
 781         int            j;
 782
 783         switch (get_initializer_kind(initializer)) {
 784         case IR_INITIALIZER_NULL:
 785                 return;
 786         case IR_INITIALIZER_TARVAL:
 787                 tv = get_initializer_tarval_value(initializer);
 788                 break;
 789         case IR_INITIALIZER_CONST: {
 790                 ir_node *node = get_initializer_const_value(initializer);
 791                 if (!is_Const(node)) {
 792                         panic("bitfield initializer not a Const node");
 793                 }
 794                 tv = get_Const_tarval(node);
 795                 break;
 796         }
 797         case IR_INITIALIZER_COMPOUND:
 798                 panic("bitfield initializer is compound");
 799         }
 800         if (tv == NULL) {
 801                 panic("Couldn't get numeric value for bitfield initializer");
 802         }
 803         tv = tarval_convert_to(tv, get_type_mode(type));
 804
 805         /* normalize offset */
 806         vals        += offset_bits >> 3;
 807         offset_bits &= 7;
 808         value_len    = get_mode_size_bits(mode);
 809
 810         /* combine bits with existing bits */
 811         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 812                 assert((size_t) (vals - glob_vals) + j < max_vals);
 813                 assert(vals[j].kind == BITFIELD ||
 814                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 815                 vals[j].kind = BITFIELD;
 816                 curr_bits    = get_tarval_sub_bits(tv, j);
 817                 vals[j].v.bf_val
 818                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 819                 value_len -= 8;
 820                 last_bits = curr_bits;
 821         }
 822 }
 823
 824 static void dump_ir_initializer(normal_or_bitfield *vals,
 825                                 const ir_initializer_t *initializer,
 826                                 ir_type *type)
 827 {
 828         assert((size_t) (vals - glob_vals) < max_vals);
 829
 830         switch (get_initializer_kind(initializer)) {
 831         case IR_INITIALIZER_NULL:
 832                 return;
 833         case IR_INITIALIZER_TARVAL: {
 834                 size_t i;
 835
 836                 assert(vals->kind != BITFIELD);
 837                 vals->kind     = TARVAL;
 838                 vals->v.tarval = get_initializer_tarval_value(initializer);
 839                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 840                 for (i = 1; i < get_type_size_bytes(type); ++i) {
 841                         vals[i].kind    = NORMAL;
 842                         vals[i].v.value = NULL;
 843                 }
 844                 return;
 845         }
 846         case IR_INITIALIZER_CONST: {
 847                 size_t i;
 848
 849                 assert(vals->kind != BITFIELD);
 850                 vals->kind    = NORMAL;
 851                 vals->v.value = get_initializer_const_value(initializer);
 852                 for (i = 1; i < get_type_size_bytes(type); ++i) {
 853                         vals[i].kind    = NORMAL;
 854                         vals[i].v.value = NULL;
 855                 }
 856                 return;
 857         }
 858         case IR_INITIALIZER_COMPOUND: {
 859                 size_t i = 0;
 860                 size_t n = get_initializer_compound_n_entries(initializer);
 861
 862                 if (is_Array_type(type)) {
 863                         ir_type *element_type = get_array_element_type(type);
 864                         size_t   skip         = get_type_size_bytes(element_type);
 865                         size_t   alignment    = get_type_alignment_bytes(element_type);
 866                         size_t   misalign     = skip % alignment;
 867                         if (misalign != 0) {
 868                                 skip += alignment - misalign;
 869                         }
 870
 871                         for (i = 0; i < n; ++i) {
 872                                 ir_initializer_t *sub_initializer
 873                                         = get_initializer_compound_value(initializer, i);
 874
 875                                 dump_ir_initializer(vals, sub_initializer, element_type);
 876
 877                                 vals += skip;
 878                         }
 879                 } else {
 880                         size_t n_members, i;
 881                         assert(is_compound_type(type));
 882                         n_members = get_compound_n_members(type);
 883                         for (i = 0; i < n_members; ++i) {
 884                                 ir_entity        *member    = get_compound_member(type, i);
 885                                 size_t            offset    = get_entity_offset(member);
 886                                 ir_type          *subtype   = get_entity_type(member);
 887                                 ir_mode          *mode      = get_type_mode(subtype);
 888                                 ir_initializer_t *sub_initializer;
 889
 890                                 assert(i < get_initializer_compound_n_entries(initializer));
 891                                 sub_initializer
 892                                         = get_initializer_compound_value(initializer, i);
 893
 894                                 if (mode != NULL) {
 895                                         size_t offset_bits
 896                                                 = get_entity_offset_bits_remainder(member);
 897                                         size_t value_len   = get_mode_size_bits(mode);
 898
 899                                         if (offset_bits != 0 ||
 900                                                 (value_len != 8 && value_len != 16 && value_len != 32
 901                                                  && value_len != 64)) {
 902                                                 dump_bitfield(&vals[offset], offset_bits,
 903                                                               sub_initializer, subtype);
 904                                                 continue;
 905                                         }
 906                                 }
 907
 908                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 909                         }
 910                 }
 911
 912                 return;
 913         }
 914         }
 915         panic("invalid ir_initializer kind found");
 916 }
 917
 918 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 919 {
 920         const ir_initializer_t *initializer = entity->attr.initializer;
 921         ir_type                *type;
 922         normal_or_bitfield     *vals;
 923         size_t                  size;
 924         size_t                  k;
 925
 926         if (initializer_is_string_const(initializer)) {
 927                 dump_string_initializer(initializer);
 928                 return;
 929         }
 930
 931         type = get_entity_type(entity);
 932         size = get_initializer_size(initializer, type);
 933
 934         if (size == 0)
 935                 return;
 936
 937         /*
 938          * In the worst case, every initializer allocates one byte.
 939          * Moreover, initializer might be big, do not allocate on stack.
 940          */
 941         vals = XMALLOCNZ(normal_or_bitfield, size);
 942
 943 #ifndef NDEBUG
 944         glob_vals = vals;
 945         max_vals  = size;
 946 #endif
 947
 948         dump_ir_initializer(vals, initializer, type);
 949
 950         /* now write values sorted */
 951         for (k = 0; k < size; ) {
 952                 int space     = 0;
 953                 int elem_size = 1;
 954                 if (vals[k].kind == NORMAL) {
 955                         if (vals[k].v.value != NULL) {
 956                                 dump_atomic_init(env, vals[k].v.value);
 957                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
 958                         } else {
 959                                 elem_size = 0;
 960                         }
 961                 } else if (vals[k].kind == TARVAL) {
 962                         tarval *tv   = vals[k].v.tarval;
 963                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 964
 965                         assert(tv != NULL);
 966
 967                         elem_size = size;
 968                         dump_size_type(size);
 969                         dump_arith_tarval(tv, size);
 970                         be_emit_char('\n');
 971                         be_emit_write_line();
 972                 } else {
 973                         assert(vals[k].kind == BITFIELD);
 974                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 975                         be_emit_write_line();
 976                 }
 977
 978                 k += elem_size;
 979                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 980                         ++space;
 981                         ++k;
 982                 }
 983
 984                 /* a gap */
 985                 if (space > 0) {
 986                         be_emit_irprintf("\t.space\t%d\n", space);
 987                         be_emit_write_line();
 988                 }
 989         }
 990         xfree(vals);
 991 }
 992
 993 /**
 994  * Dump an initializer for a compound entity.
 995  */
 996 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
 997 {
 998         normal_or_bitfield *vals;
 999         int i, j, n;
1000         unsigned k, last_ofs;
1001
1002         if (ent->has_initializer) {
1003                 dump_initializer(env, ent);
1004                 return;
1005         }
1006
1007         n = get_compound_ent_n_values(ent);
1008
1009         /* Find the initializer size. Sorrily gcc support a nasty feature:
1010            The last field of a compound may be a flexible array. This allows
1011            initializers bigger than the type size. */
1012         last_ofs = get_type_size_bytes(get_entity_type(ent));
1013         for (i = 0; i < n; ++i) {
1014                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1015                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1016                 ir_node  *value         = get_compound_ent_value(ent, i);
1017                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1018
1019                 offset += (value_len + bits_remainder + 7) >> 3;
1020
1021                 if (offset > last_ofs) {
1022                         last_ofs = offset;
1023                 }
1024         }
1025
1026         /*
1027          * In the worst case, every initializer allocates one byte.
1028          * Moreover, initializer might be big, do not allocate on stack.
1029          */
1030         vals = XMALLOCNZ(normal_or_bitfield, last_ofs);
1031
1032         /* collect the values and store them at the offsets */
1033         for (i = 0; i < n; ++i) {
1034                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1035                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1036                 ir_node  *value      = get_compound_ent_value(ent, i);
1037                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1038
1039                 assert(offset_bits >= 0);
1040
1041                 if (offset_bits != 0 ||
1042                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1043                         tarval *tv = get_atomic_init_tv(value);
1044                         unsigned char curr_bits, last_bits = 0;
1045                         if (tv == NULL) {
1046                                 panic("Couldn't get numeric value for bitfield initializer '%s'",
1047                                       get_entity_ld_name(ent));
1048                         }
1049                         /* normalize offset */
1050                         offset += offset_bits >> 3;
1051                         offset_bits &= 7;
1052
1053                         for (j = 0; value_len + offset_bits > 0; ++j) {
1054                                 assert(offset + j < last_ofs);
1055                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1056                                 vals[offset + j].kind = BITFIELD;
1057                                 curr_bits = get_tarval_sub_bits(tv, j);
1058                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1059                                 value_len -= 8;
1060                                 last_bits = curr_bits;
1061                         }
1062                 } else {
1063                         int i;
1064
1065                         assert(offset < last_ofs);
1066                         assert(vals[offset].kind == NORMAL);
1067                         for (i = 1; i < value_len / 8; ++i) {
1068                                 assert(vals[offset + i].v.value == NULL);
1069                         }
1070                         vals[offset].v.value = value;
1071                 }
1072         }
1073
1074         /* now write them sorted */
1075         for (k = 0; k < last_ofs; ) {
1076                 int space = 0, skip = 0;
1077                 if (vals[k].kind == NORMAL) {
1078                         if (vals[k].v.value != NULL) {
1079                                 dump_atomic_init(env, vals[k].v.value);
1080                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1081                         } else {
1082                                 space = 1;
1083                         }
1084                 } else {
1085                         assert(vals[k].kind == BITFIELD);
1086                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1087                 }
1088
1089                 ++k;
1090                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1091                         ++space;
1092                         ++k;
1093                 }
1094                 space -= skip;
1095                 assert(space >= 0);
1096
1097                 /* a gap */
1098                 if (space > 0) {
1099                         be_emit_irprintf("\t.space\t%d\n", space);
1100                         be_emit_write_line();
1101                 }
1102         }
1103         xfree(vals);
1104 }
1105
1106 static void emit_align(unsigned p2alignment)
1107 {
1108         be_emit_irprintf("\t.p2align\t%u\n", log2_floor(p2alignment));
1109         be_emit_write_line();
1110 }
1111
1112 static unsigned get_effective_entity_alignment(ir_entity *entity)
1113 {
1114         unsigned alignment = get_entity_alignment(entity);
1115         if (alignment == 0) {
1116                 ir_type *type = get_entity_type(entity);
1117                 alignment     = get_type_alignment_bytes(type);
1118         }
1119         return alignment;
1120 }
1121
1122
1123 /**
1124  * Dump a global entity.
1125  *
1126  * @param env           the gas output environment
1127  * @param ent           the entity to be dumped
1128  */
1129 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1130 {
1131         ir_type          *type           = get_entity_type(ent);
1132         ident            *ld_ident       = get_entity_ld_ident(ent);
1133         unsigned          alignment      = get_effective_entity_alignment(ent);
1134         int               emit_as_common = 0;
1135         be_gas_section_t  section        = env->section;
1136         ir_variability    variability    = get_entity_variability(ent);
1137         ir_visibility     visibility     = get_entity_visibility(ent);
1138
1139         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1140                 return;
1141         }
1142         if (type == firm_code_type) {
1143                 return;
1144         }
1145
1146         if (section != (be_gas_section_t) -1) {
1147                 emit_as_common = 0;
1148         } else if (variability == variability_constant) {
1149                 /* a constant entity, put it on the rdata */
1150                 section = GAS_SECTION_RODATA;
1151                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1152                                 && ent_is_string_const(ent)) {
1153                         section = GAS_SECTION_CSTRING;
1154                 }
1155         } else if (variability == variability_uninitialized) {
1156                 /* uninitialized entity put it in bss segment */
1157                 section = GAS_SECTION_COMMON;
1158                 if (visibility != visibility_local)
1159                         emit_as_common = 1;
1160         } else {
1161                 section = GAS_SECTION_DATA;
1162         }
1163
1164         if (!emit_as_common) {
1165                 be_gas_emit_switch_section(section);
1166         }
1167
1168         be_dbg_variable(ent);
1169
1170         /* global or not global */
1171         if (visibility == visibility_external_visible && !emit_as_common) {
1172                 be_emit_cstring(".globl\t");
1173                 be_emit_ident(ld_ident);
1174                 be_emit_char('\n');
1175                 be_emit_write_line();
1176         } else if (visibility == visibility_external_allocated) {
1177                 be_emit_cstring(".globl\t");
1178                 be_emit_ident(ld_ident);
1179                 be_emit_char('\n');
1180                 be_emit_write_line();
1181                 /* we can return now... */
1182                 return;
1183         }
1184         if (!is_po2(alignment))
1185                 panic("alignment not a power of 2");
1186         /* alignment */
1187         if (alignment > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1188                         && section != GAS_SECTION_PIC_SYMBOLS) {
1189                 emit_align(alignment);
1190         }
1191
1192         if (visibility != visibility_external_allocated && !emit_as_common
1193                         && be_gas_flavour == GAS_FLAVOUR_ELF) {
1194                 be_emit_cstring("\t.type\t");
1195                 be_emit_ident(ld_ident);
1196                 be_emit_cstring(", @object\n\t.size\t");
1197                 be_emit_ident(ld_ident);
1198                 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1199         }
1200
1201         if (!emit_as_common) {
1202                 be_emit_ident(ld_ident);
1203                 be_emit_cstring(":\n");
1204                 be_emit_write_line();
1205         }
1206
1207         if (variability == variability_uninitialized) {
1208                 if (emit_as_common) {
1209                         switch (be_gas_flavour) {
1210                         case GAS_FLAVOUR_MACH_O:
1211                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1212                                         get_id_str(ld_ident), get_type_size_bytes(type),
1213                                         log2_floor(alignment));
1214                                 break;
1215                         case GAS_FLAVOUR_ELF:
1216                         case GAS_FLAVOUR_YASM:
1217                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1218                                         get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1219                                 be_emit_write_line();
1220                                 break;
1221                         case GAS_FLAVOUR_MINGW:
1222                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1223                                         get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1224                                 be_emit_write_line();
1225                                 break;
1226                         }
1227                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES
1228                                 || section == GAS_SECTION_PIC_SYMBOLS) {
1229                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1230                                 be_emit_cstring("\t.indirect_symbol ");
1231                                 be_emit_ident(get_entity_ident(ent));
1232                                 be_emit_char('\n');
1233                                 be_emit_write_line();
1234                                 if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1235                                         be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1236                                         be_emit_write_line();
1237                                 } else {
1238                                         assert(section == GAS_SECTION_PIC_SYMBOLS);
1239                                         be_emit_cstring("\t.long 0\n");
1240                                         be_emit_write_line();
1241                                 }
1242                         } else {
1243                                 panic("PIC trampolines not yet supported in this gas mode");
1244                         }
1245                 } else {
1246                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1247                         be_emit_write_line();
1248                 }
1249         } else {
1250                 if (is_atomic_entity(ent)) {
1251                         dump_atomic_init(env, get_atomic_ent_value(ent));
1252                 } else {
1253                         /* sort_compound_ent_values(ent); */
1254
1255                         switch (get_type_tpop_code(get_entity_type(ent))) {
1256                         case tpo_array:
1257                                 if (ent_is_string_const(ent))
1258                                         dump_string_cst(ent);
1259                                 else
1260                                         dump_compound_init(env, ent);
1261                                 break;
1262                         case tpo_struct:
1263                         case tpo_class:
1264                         case tpo_union:
1265                                 dump_compound_init(env, ent);
1266                                 break;
1267                         default:
1268                                 panic("Unimplemented type kind in dump_global()");
1269                         }
1270                 }
1271         }
1272 }
1273
1274 /**
1275  * Dumps declarations of global variables and the initialization code.
1276  *
1277  * @param gt                a global like type, either the global or the TLS one
1278  * @param env               an environment
1279  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1280  *                          its visited flag set are ignored
1281  */
1282 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1283                                 int only_emit_marked)
1284 {
1285         int i, n = get_compound_n_members(gt);
1286         waitq *worklist = new_waitq();
1287
1288         if (only_emit_marked) {
1289                 for (i = 0; i < n; i++) {
1290                         ir_entity *ent = get_compound_member(gt, i);
1291                         if (is_entity_backend_marked(ent) ||
1292                             get_entity_visibility(ent) != visibility_external_allocated) {
1293                                 waitq_put(worklist, ent);
1294                                 set_entity_backend_marked(ent, 1);
1295                         }
1296                 }
1297         } else {
1298                 for (i = 0; i < n; i++) {
1299                         ir_entity *ent = get_compound_member(gt, i);
1300                         set_entity_backend_marked(ent, 1);
1301                         waitq_put(worklist, ent);
1302                 }
1303         }
1304
1305         env->worklist = worklist;
1306
1307         while (!waitq_empty(worklist)) {
1308                 ir_entity *ent = waitq_get(worklist);
1309
1310                 dump_global(env, ent);
1311         }
1312
1313         del_waitq(worklist);
1314         env->worklist = NULL;
1315 }
1316
1317 /************************************************************************/
1318
1319 /* Generate all entities. */
1320 void be_gas_emit_decls(const be_main_env_t *main_env,
1321                        int only_emit_marked_entities)
1322 {
1323         be_gas_decl_env_t env;
1324         memset(&env, 0, sizeof(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 }