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