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

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief       Dumps global variables and constants as gas assembler.
  23  * @author      Christian Wuerdig, Matthias Braun
  24  * @date        04.11.2005
  25  * @version     $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "begnuas.h"
  32
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <ctype.h>
  36 #include <assert.h>
  37
  38 #include "obst.h"
  39 #include "tv.h"
  40 #include "irnode.h"
  41 #include "irprog.h"
  42 #include "pdeq.h"
  43 #include "entity_t.h"
  44 #include "error.h"
  45
  46 #include "be_t.h"
  47 #include "beemitter.h"
  48 #include "be_dbgout.h"
  49
  50 /** by default, we generate assembler code for the Linux gas */
  51 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_ELF;
  52
  53 static be_gas_section_t current_section = (be_gas_section_t) -1;
  54
  55 /**
  56  * Return the pseudo-instruction to be issued for a section switch
  57  * depending on the current flavour.
  58  *
  59  * @param section  the section to switch to
  60  *
  61  * @return  the pseudo-instruction
  62  */
  63 static const char *get_section_name(be_gas_section_t section) {
  64         static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
  65                 { /* GAS_FLAVOUR_ELF */
  66                         ".section\t.text",
  67                         ".section\t.data",
  68                         ".section\t.rodata",
  69                         ".section\t.bss",
  70                         ".section\t.tbss,\"awT\",@nobits",
  71                         ".section\t.ctors,\"aw\",@progbits",
  72                         ".section\t.dtors,\"aw\",@progbits",
  73                         NULL, /* no cstring section */
  74                         NULL,
  75                         NULL
  76                 },
  77                 { /* GAS_FLAVOUR_MINGW */
  78                         ".section\t.text",
  79                         ".section\t.data",
  80                         ".section .rdata,\"dr\"",
  81                         ".section\t.bss",
  82                         ".section\t.tbss,\"awT\",@nobits",
  83                         ".section\t.ctors,\"aw\",@progbits",
  84                         ".section\t.dtors,\"aw\",@progbits",
  85                         NULL,
  86                         NULL,
  87                         NULL
  88                 },
  89                 { /* GAS_FLAVOUR_YASM */
  90                         ".section\t.text",
  91                         ".section\t.data",
  92                         ".section\t.rodata",
  93                         ".section\t.bss",
  94                         ".section\t.tbss,\"awT\",@nobits",
  95                         ".section\t.ctors,\"aw\",@progbits",
  96                         ".section\t.dtors,\"aw\",@progbits",
  97                         NULL,
  98                         NULL,
  99                         NULL
 100                 },
 101                 { /* GAS_FLAVOUR_MACH_O */
 102                         ".text",
 103                         ".data",
 104                         ".const",
 105                         ".data",
 106                         NULL,             /* TLS is not supported on Mach-O */
 107                         ".mod_init_func",
 108                         NULL,             /* TODO: how is this called? */
 109                         ".cstring",
 110                         ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
 111                         ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
 112                 }
 113         };
 114
 115         assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
 116         assert((int) section >= 0 && section <= GAS_SECTION_LAST);
 117         return text[be_gas_flavour][section];
 118 }
 119
 120 void be_gas_emit_switch_section(be_gas_section_t section) {
 121         if(current_section == section)
 122                 return;
 123
 124         be_emit_char('\t');
 125         be_emit_string(get_section_name(section));
 126         be_emit_char('\n');
 127         be_emit_write_line();
 128         current_section = section;
 129 }
 130
 131 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
 132 {
 133         const char *name = get_entity_ld_name(entity);
 134         const char *fill_byte = "";
 135         unsigned maximum_skip;
 136
 137         be_gas_emit_switch_section(GAS_SECTION_TEXT);
 138
 139         /* write the begin line (used by scripts processing the assembler... */
 140         be_emit_write_line();
 141         be_emit_cstring("# -- Begin  ");
 142         be_emit_string(name);
 143         be_emit_char('\n');
 144         be_emit_write_line();
 145
 146         /* gcc fills space between function with 0x90, no idea if this is needed */
 147         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 148                 fill_byte = "0x90";
 149         }
 150
 151         if (alignment > 0) {
 152                 maximum_skip = (1 << alignment) - 1;
 153                 be_emit_cstring("\t.p2align ");
 154                 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
 155                 be_emit_write_line();
 156         }
 157         if (get_entity_visibility(entity) == visibility_external_visible) {
 158                 be_emit_cstring(".globl ");
 159                 be_emit_string(name);
 160                 be_emit_char('\n');
 161                 be_emit_write_line();
 162         }
 163
 164         switch (be_gas_flavour) {
 165         case GAS_FLAVOUR_ELF:
 166                 be_emit_cstring("\t.type\t");
 167                 be_emit_string(name);
 168                 be_emit_cstring(", @function\n");
 169                 be_emit_write_line();
 170                 break;
 171         case GAS_FLAVOUR_MINGW:
 172                 be_emit_cstring("\t.def\t");
 173                 be_emit_string(name);
 174                 if (get_entity_visibility(entity) == visibility_external_visible) {
 175                         be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
 176                 } else {
 177                         be_emit_cstring(";\t.scl\t3;\t.type\t32;\t.endef\n");
 178                 }
 179                 be_emit_write_line();
 180                 break;
 181         case GAS_FLAVOUR_MACH_O:
 182         case GAS_FLAVOUR_YASM:
 183                 break;
 184         }
 185         be_emit_string(name);
 186         be_emit_cstring(":\n");
 187         be_emit_write_line();
 188 }
 189
 190 void be_gas_emit_function_epilog(ir_entity *entity)
 191 {
 192         const char *name = get_entity_ld_name(entity);
 193
 194         if (be_gas_flavour == GAS_FLAVOUR_ELF) {
 195                 be_emit_cstring("\t.size\t");
 196                 be_emit_string(name);
 197                 be_emit_cstring(", .-");
 198                 be_emit_string(name);
 199                 be_emit_char('\n');
 200                 be_emit_write_line();
 201         }
 202
 203         be_emit_cstring("# -- End  ");
 204         be_emit_string(name);
 205         be_emit_char('\n');
 206         be_emit_write_line();
 207 }
 208
 209 /**
 210  * An environment containing all needed dumper data.
 211  * Currently we create the file completely in memory first, then
 212  * write it to the disk. This is an artifact from the old C-generating backend
 213  * and even there NOT needed. So we might change it in the future.
 214  */
 215 typedef struct _be_gas_decl_env {
 216         const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
 217         be_gas_section_t     section;
 218         waitq               *worklist;           /**< A worklist we use to place not yet handled entities on. */
 219 } be_gas_decl_env_t;
 220
 221 /************************************************************************/
 222
 223 /**
 224  * Output a tarval.
 225  *
 226  * @param tv     the tarval
 227  * @param bytes  the width of the tarvals value in bytes
 228  */
 229 static void dump_arith_tarval(tarval *tv, int bytes)
 230 {
 231         switch (bytes) {
 232         case 1:
 233                 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
 234                 return;
 235
 236         case 2:
 237                 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 238                 return;
 239
 240         case 4:
 241                 be_emit_irprintf("0x%02x%02x%02x%02x",
 242                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 243                 return;
 244
 245         case 8:
 246                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
 247                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 248                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 249                 return;
 250
 251         case 12:
 252                 /* Beware: Mixed endian output!  One little endian number emitted as
 253                  * three longs.  Each long initializer is written in big endian. */
 254                 be_emit_irprintf(
 255                         "\t.long\t0x%02x%02x%02x%02x\n"
 256                         "\t.long\t0x%02x%02x%02x%02x\n"
 257                         "\t.long\t0x%02x%02x%02x%02x",
 258                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 259                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0),
 260                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 261                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 262                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 263                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8)
 264                 );
 265                 return;
 266
 267         case 16:
 268                 be_emit_irprintf(
 269                         "\t.long\t0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x",
 270                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 271                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 272                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 273                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8),
 274                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 275                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 276                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 277                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0)
 278                 );
 279                 return;
 280         }
 281
 282         panic("Can't dump a tarval with %d bytes", bytes);
 283 }
 284
 285 /**
 286  * Return the label prefix for labeled blocks.
 287  */
 288 const char *be_gas_block_label_prefix(void) {
 289         return ".LG";
 290 }
 291
 292 /**
 293  * Return the label prefix for labeled instructions.
 294  */
 295 const char *be_gas_insn_label_prefix(void) {
 296         return ".LE";
 297 }
 298
 299 /**
 300  * Dump a label.
 301  */
 302 static void dump_label(ir_label_t label) {
 303         be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
 304 }
 305
 306 /**
 307  * Return the tarval of an atomic initializer.
 308  *
 309  * @param init  a node representing the initializer (on the const code irg)
 310  *
 311  * @return the tarval
 312  */
 313 static tarval *get_atomic_init_tv(ir_node *init)
 314 {
 315         for (;;) {
 316                 ir_mode *mode = get_irn_mode(init);
 317
 318                 switch (get_irn_opcode(init)) {
 319
 320                 case iro_Cast:
 321                         init = get_Cast_op(init);
 322                         continue;
 323
 324                 case iro_Conv:
 325                         init = get_Conv_op(init);
 326                         continue;
 327
 328                 case iro_Const:
 329                         return get_Const_tarval(init);
 330
 331                 case iro_SymConst:
 332                         switch (get_SymConst_kind(init)) {
 333                         case symconst_type_size:
 334                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 335
 336                         case symconst_type_align:
 337                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 338
 339                         case symconst_ofs_ent:
 340                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 341
 342                         case symconst_enum_const:
 343                                 return get_enumeration_value(get_SymConst_enum(init));
 344
 345                         case symconst_label:
 346                                 return NULL;
 347
 348                         default:
 349                                 return NULL;
 350                         }
 351
 352                 default:
 353                         return NULL;
 354                 }
 355         }
 356 }
 357
 358 /**
 359  * Dump an atomic value.
 360  *
 361  * @param env   the gas output environment
 362  * @param init  a node representing the atomic value (on the const code irg)
 363  */
 364 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 365 {
 366         ir_mode *mode = get_irn_mode(init);
 367         int bytes     = get_mode_size_bytes(mode);
 368         tarval *tv;
 369         ir_label_t label;
 370         ir_entity *ent;
 371
 372         init = skip_Id(init);
 373
 374         switch (get_irn_opcode(init)) {
 375         case iro_Cast:
 376                 do_dump_atomic_init(env, get_Cast_op(init));
 377                 return;
 378
 379         case iro_Conv:
 380                 do_dump_atomic_init(env, get_Conv_op(init));
 381                 return;
 382
 383         case iro_Const:
 384                 tv = get_Const_tarval(init);
 385
 386                 /* it's a arithmetic value */
 387                 dump_arith_tarval(tv, bytes);
 388                 return;
 389
 390         case iro_SymConst:
 391                 switch (get_SymConst_kind(init)) {
 392                 case symconst_addr_name:
 393                         be_emit_ident(get_SymConst_name(init));
 394                         break;
 395
 396                 case symconst_addr_ent:
 397                         ent = get_SymConst_entity(init);
 398                         if(!is_entity_backend_marked(ent)) {
 399                                 waitq_put(env->worklist, ent);
 400                                 set_entity_backend_marked(ent, 1);
 401                         }
 402                         be_emit_ident(get_entity_ld_ident(ent));
 403                         break;
 404
 405                 case symconst_ofs_ent:
 406                         ent = get_SymConst_entity(init);
 407 #if 0       /* not needed, is it? */
 408                         if(!is_entity_backend_marked(ent)) {
 409                                 waitq_put(env->worklist, ent);
 410                                 set_entity_backend_marked(ent, 1);
 411                         }
 412 #endif
 413                         be_emit_irprintf("%d", get_entity_offset(ent));
 414                         break;
 415
 416                 case symconst_type_size:
 417                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 418                         break;
 419
 420                 case symconst_type_align:
 421                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 422                         break;
 423
 424                 case symconst_enum_const:
 425                         tv = get_enumeration_value(get_SymConst_enum(init));
 426                         dump_arith_tarval(tv, bytes);
 427                         break;
 428
 429                 case symconst_label:
 430                         label = get_SymConst_label(init);
 431                         dump_label(label);
 432                         break;
 433
 434                 default:
 435                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 436                 }
 437                 return;
 438
 439                 case iro_Add:
 440                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 441                                 panic("Constant must be int or pointer for '+' to work");
 442                         }
 443                         do_dump_atomic_init(env, get_Add_left(init));
 444                         be_emit_cstring(" + ");
 445                         do_dump_atomic_init(env, get_Add_right(init));
 446                         return;
 447
 448                 case iro_Sub:
 449                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 450                                 panic("Constant must be int or pointer for '-' to work");
 451                         }
 452                         do_dump_atomic_init(env, get_Sub_left(init));
 453                         be_emit_cstring(" - ");
 454                         do_dump_atomic_init(env, get_Sub_right(init));
 455                         return;
 456
 457                 case iro_Mul:
 458                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 459                                 panic("Constant must be int or pointer for '*' to work");
 460                         }
 461                         do_dump_atomic_init(env, get_Mul_left(init));
 462                         be_emit_cstring(" * ");
 463                         do_dump_atomic_init(env, get_Mul_right(init));
 464                         return;
 465
 466                 default:
 467                         assert(0 && "dump_atomic_init(): unknown IR-node");
 468         }
 469 }
 470
 471 /**
 472  * Dumps the type for given size (.byte, .long, ...)
 473  *
 474  * @param size  the size in bytes
 475  */
 476 static void dump_size_type(size_t size) {
 477         switch (size) {
 478         case 1:
 479                 be_emit_cstring("\t.byte\t");
 480                 break;
 481
 482         case 2:
 483                 be_emit_cstring("\t.word\t");
 484                 break;
 485
 486         case 4:
 487                 be_emit_cstring("\t.long\t");
 488                 break;
 489
 490         case 8:
 491                 be_emit_cstring("\t.quad\t");
 492                 break;
 493
 494         case 10:
 495         case 12:
 496                 /* handled in arith */
 497                 break;
 498
 499         case 16:
 500                 be_emit_cstring("\t.octa\t");
 501                 break;
 502
 503         default:
 504                 panic("Try to dump a type with %u bytes", (unsigned)size);
 505         }
 506 }
 507
 508 /**
 509  * Emit an atomic value.
 510  *
 511  * @param env   the gas output environment
 512  * @param init  a node representing the atomic value (on the const code irg)
 513  */
 514 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 515 {
 516         ir_mode *mode = get_irn_mode(init);
 517         int bytes     = get_mode_size_bytes(mode);
 518
 519         dump_size_type(bytes);
 520         do_dump_atomic_init(env, init);
 521         be_emit_char('\n');
 522         be_emit_write_line();
 523 }
 524
 525 /************************************************************************/
 526 /* Routines to dump global variables                                    */
 527 /************************************************************************/
 528
 529 static int initializer_is_string_const(const ir_initializer_t *initializer)
 530 {
 531         size_t i, len;
 532         int found_printable = 0;
 533
 534         if(initializer->kind != IR_INITIALIZER_COMPOUND)
 535                 return 0;
 536
 537         len = initializer->compound.n_initializers;
 538         if (len < 1)
 539                 return 0;
 540         for(i = 0; i < len; ++i) {
 541                 int               c;
 542                 tarval           *tv;
 543                 ir_mode          *mode;
 544                 ir_initializer_t *sub_initializer
 545                         = initializer->compound.initializers[i];
 546
 547                 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
 548                         return 0;
 549
 550                 tv   = sub_initializer->tarval.value;
 551                 mode = get_tarval_mode(tv);
 552
 553                 if (!mode_is_int(mode)
 554                                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 555                         return 0;
 556
 557                 c = get_tarval_long(tv);
 558                 if (isgraph(c) || isspace(c))
 559                         found_printable = 1;
 560                 else if(c != 0)
 561                         return 0;
 562
 563                 if (i == len - 1 && c != '\0')
 564                         return 0;
 565         }
 566
 567         return found_printable;
 568 }
 569
 570 /**
 571  * Determine if an entity is a string constant
 572  * @param ent The entity
 573  * @return 1 if it is a string constant, 0 otherwise
 574  */
 575 static int ent_is_string_const(ir_entity *ent)
 576 {
 577         ir_type *type, *element_type;
 578         ir_mode *mode;
 579         int i, c, n;
 580         int found_printable = 0;
 581
 582         type = get_entity_type(ent);
 583
 584         /* if it's an array */
 585         if (!is_Array_type(type))
 586                 return 0;
 587
 588         element_type = get_array_element_type(type);
 589
 590         /* and the array's element type is primitive */
 591         if (!is_Primitive_type(element_type))
 592                 return 0;
 593
 594         /* and the mode of the element type is an int of
 595          * the same size as the byte mode */
 596         mode = get_type_mode(element_type);
 597         if (!mode_is_int(mode)
 598                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 599                 return 0;
 600
 601         if(ent->has_initializer) {
 602                 /* TODO */
 603                 return 0;
 604         } else {
 605                 /* if it contains only printable chars and a 0 at the end */
 606                 n = get_compound_ent_n_values(ent);
 607                 for (i = 0; i < n; ++i) {
 608                         ir_node *irn = get_compound_ent_value(ent, i);
 609                         if (! is_Const(irn))
 610                                 return 0;
 611
 612                         c = (int) get_tarval_long(get_Const_tarval(irn));
 613
 614                         if (isgraph(c) || isspace(c))
 615                                 found_printable = 1;
 616                         else if(c != 0)
 617                                 return 0;
 618
 619                         if (i == n - 1 && c != '\0')
 620                                 return 0;
 621                 }
 622         }
 623
 624         /* then we can emit it as a string constant */
 625         return found_printable;
 626 }
 627
 628 /**
 629  * Dump a string constant.
 630  * No checks are made!!
 631  *
 632  * @param ent  The entity to dump.
 633  */
 634 static void dump_string_cst(ir_entity *ent)
 635 {
 636         int      i, len;
 637         ir_type *type;
 638         int      type_size;
 639         int      remaining_space;
 640
 641         len = get_compound_ent_n_values(ent);
 642         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 643                 be_emit_cstring("\t.ascii \"");
 644         } else {
 645                 be_emit_cstring("\t.string \"");
 646                 len -= 1;
 647         }
 648
 649         for (i = 0; i < 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.skip\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
 818         /* normalize offset */
 819         vals        += offset_bits >> 3;
 820         offset_bits &= 7;
 821         value_len    = get_mode_size_bits(mode);
 822
 823         /* combine bits with existing bits */
 824         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 825                 assert((size_t) (vals - glob_vals) + j < max_vals);
 826                 assert(vals[j].kind == BITFIELD ||
 827                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 828                 vals[j].kind = BITFIELD;
 829                 curr_bits    = get_tarval_sub_bits(tv, j);
 830                 vals[j].v.bf_val
 831                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 832                 value_len -= 8;
 833                 last_bits = curr_bits;
 834         }
 835 }
 836
 837 static void dump_ir_initializer(normal_or_bitfield *vals,
 838                                 const ir_initializer_t *initializer,
 839                                 ir_type *type)
 840 {
 841         assert((size_t) (vals - glob_vals) < max_vals);
 842
 843         switch(get_initializer_kind(initializer)) {
 844         case IR_INITIALIZER_NULL:
 845                 return;
 846         case IR_INITIALIZER_TARVAL: {
 847                 size_t i;
 848
 849                 assert(vals->kind != BITFIELD);
 850                 vals->kind     = TARVAL;
 851                 vals->v.tarval = get_initializer_tarval_value(initializer);
 852                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 853                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 854                         vals[i].kind    = NORMAL;
 855                         vals[i].v.value = NULL;
 856                 }
 857                 return;
 858         }
 859         case IR_INITIALIZER_CONST: {
 860                 size_t i;
 861
 862                 assert(vals->kind != BITFIELD);
 863                 vals->kind    = NORMAL;
 864                 vals->v.value = get_initializer_const_value(initializer);
 865                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 866                         vals[i].kind    = NORMAL;
 867                         vals[i].v.value = NULL;
 868                 }
 869                 return;
 870         }
 871         case IR_INITIALIZER_COMPOUND: {
 872                 size_t i = 0;
 873                 size_t n = get_initializer_compound_n_entries(initializer);
 874
 875                 if(is_Array_type(type)) {
 876                         ir_type *element_type = get_array_element_type(type);
 877                         size_t   skip         = get_type_size_bytes(element_type);
 878                         size_t   alignment    = get_type_alignment_bytes(element_type);
 879                         size_t   misalign     = skip % alignment;
 880                         if(misalign != 0) {
 881                                 skip += alignment - misalign;
 882                         }
 883
 884                         for(i = 0; i < n; ++i) {
 885                                 ir_initializer_t *sub_initializer
 886                                         = get_initializer_compound_value(initializer, i);
 887
 888                                 dump_ir_initializer(vals, sub_initializer, element_type);
 889
 890                                 vals += skip;
 891                         }
 892                 } else {
 893                         size_t n_members, i;
 894                         assert(is_compound_type(type));
 895                         n_members = get_compound_n_members(type);
 896                         for(i = 0; i < n_members; ++i) {
 897                                 ir_entity        *member    = get_compound_member(type, i);
 898                                 size_t            offset    = get_entity_offset(member);
 899                                 ir_type          *subtype   = get_entity_type(member);
 900                                 ir_mode          *mode      = get_type_mode(subtype);
 901                                 ir_initializer_t *sub_initializer;
 902
 903                                 assert(i < get_initializer_compound_n_entries(initializer));
 904                                 sub_initializer
 905                                         = get_initializer_compound_value(initializer, i);
 906
 907                                 if(mode != NULL) {
 908                                         size_t offset_bits
 909                                                 = get_entity_offset_bits_remainder(member);
 910                                         size_t value_len   = get_mode_size_bits(mode);
 911
 912                                         if(offset_bits != 0 ||
 913                                                 (value_len != 8 && value_len != 16 && value_len != 32
 914                                                  && value_len != 64)) {
 915                                                 dump_bitfield(&vals[offset], offset_bits,
 916                                                               sub_initializer, subtype);
 917                                                 continue;
 918                                         }
 919                                 }
 920
 921                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 922                         }
 923                 }
 924
 925                 return;
 926         }
 927         }
 928         panic("invalid ir_initializer kind found");
 929 }
 930
 931 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 932 {
 933         const ir_initializer_t *initializer = entity->attr.initializer;
 934         ir_type                *type;
 935         normal_or_bitfield     *vals;
 936         size_t                  size;
 937         size_t                  k;
 938
 939         if(initializer_is_string_const(initializer)) {
 940                 dump_string_initializer(initializer);
 941                 return;
 942         }
 943
 944         type = get_entity_type(entity);
 945         size = get_initializer_size(initializer, type);
 946
 947         if (size == 0)
 948                 return;
 949
 950         /*
 951          * In the worst case, every initializer allocates one byte.
 952          * Moreover, initializer might be big, do not allocate on stack.
 953          */
 954         vals = xcalloc(size, sizeof(vals[0]));
 955
 956 #ifndef NDEBUG
 957         glob_vals = vals;
 958         max_vals  = size;
 959 #endif
 960
 961         dump_ir_initializer(vals, initializer, type);
 962
 963         /* now write values sorted */
 964         for (k = 0; k < size; ) {
 965                 int space     = 0;
 966                 int elem_size = 1;
 967                 if (vals[k].kind == NORMAL) {
 968                         if(vals[k].v.value != NULL) {
 969                                 dump_atomic_init(env, vals[k].v.value);
 970                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
 971                         } else {
 972                                 elem_size = 0;
 973                         }
 974                 } else if(vals[k].kind == TARVAL) {
 975                         tarval *tv   = vals[k].v.tarval;
 976                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 977
 978                         assert(tv != NULL);
 979
 980                         elem_size = size;
 981                         dump_size_type(size);
 982                         dump_arith_tarval(tv, size);
 983                         be_emit_char('\n');
 984                         be_emit_write_line();
 985                 } else {
 986                         assert(vals[k].kind == BITFIELD);
 987                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 988                         be_emit_write_line();
 989                 }
 990
 991                 k += elem_size;
 992                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 993                         ++space;
 994                         ++k;
 995                 }
 996
 997                 /* a gap */
 998                 if (space > 0) {
 999                         be_emit_irprintf("\t.skip\t%d\n", space);
1000                         be_emit_write_line();
1001                 }
1002         }
1003         xfree(vals);
1004 }
1005
1006 /**
1007  * Dump an initializer for a compound entity.
1008  */
1009 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1010 {
1011         normal_or_bitfield *vals;
1012         int i, j, n;
1013         unsigned k, last_ofs;
1014
1015         if(ent->has_initializer) {
1016                 dump_initializer(env, ent);
1017                 return;
1018         }
1019
1020         n = get_compound_ent_n_values(ent);
1021
1022         /* Find the initializer size. Sorrily gcc support a nasty feature:
1023            The last field of a compound may be a flexible array. This allows
1024            initializers bigger than the type size. */
1025         last_ofs = get_type_size_bytes(get_entity_type(ent));
1026         for (i = 0; i < n; ++i) {
1027                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1028                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1029                 ir_node  *value         = get_compound_ent_value(ent, i);
1030                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1031
1032                 offset += (value_len + bits_remainder + 7) >> 3;
1033
1034                 if (offset > last_ofs) {
1035                         last_ofs = offset;
1036                 }
1037         }
1038
1039         /*
1040          * In the worst case, every initializer allocates one byte.
1041          * Moreover, initializer might be big, do not allocate on stack.
1042          */
1043         vals = xcalloc(last_ofs, sizeof(vals[0]));
1044
1045         /* collect the values and store them at the offsets */
1046         for (i = 0; i < n; ++i) {
1047                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1048                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1049                 ir_node  *value      = get_compound_ent_value(ent, i);
1050                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1051
1052                 assert(offset_bits >= 0);
1053
1054                 if (offset_bits != 0 ||
1055                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1056                         tarval *tv = get_atomic_init_tv(value);
1057                         unsigned char curr_bits, last_bits = 0;
1058                         if (tv == NULL) {
1059                                 panic("Couldn't get numeric value for bitfield initializer '%s'",
1060                                       get_entity_ld_name(ent));
1061                         }
1062                         /* normalize offset */
1063                         offset += offset_bits >> 3;
1064                         offset_bits &= 7;
1065
1066                         for (j = 0; value_len + offset_bits > 0; ++j) {
1067                                 assert(offset + j < last_ofs);
1068                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1069                                 vals[offset + j].kind = BITFIELD;
1070                                 curr_bits = get_tarval_sub_bits(tv, j);
1071                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1072                                 value_len -= 8;
1073                                 last_bits = curr_bits;
1074                         }
1075                 } else {
1076                         int i;
1077
1078                         assert(offset < last_ofs);
1079                         assert(vals[offset].kind == NORMAL);
1080                         for (i = 1; i < value_len / 8; ++i) {
1081                                 assert(vals[offset + i].v.value == NULL);
1082                         }
1083                         vals[offset].v.value = value;
1084                 }
1085         }
1086
1087         /* now write them sorted */
1088         for (k = 0; k < last_ofs; ) {
1089                 int space = 0, skip = 0;
1090                 if (vals[k].kind == NORMAL) {
1091                         if(vals[k].v.value != NULL) {
1092                                 dump_atomic_init(env, vals[k].v.value);
1093                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1094                         } else {
1095                                 space = 1;
1096                         }
1097                 } else {
1098                         assert(vals[k].kind == BITFIELD);
1099                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1100                 }
1101
1102                 ++k;
1103                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1104                         ++space;
1105                         ++k;
1106                 }
1107                 space -= skip;
1108                 assert(space >= 0);
1109
1110                 /* a gap */
1111                 if (space > 0) {
1112                         be_emit_irprintf("\t.skip\t%d\n", space);
1113                         be_emit_write_line();
1114                 }
1115         }
1116         xfree(vals);
1117 }
1118
1119 static void emit_align(unsigned alignment)
1120 {
1121         if (!is_po2(alignment))
1122                 panic("alignment not a power of 2");
1123
1124         be_emit_irprintf("\t.p2align\t%u\n", log2_floor(alignment));
1125         be_emit_write_line();
1126 }
1127
1128 /**
1129  * Dump a global entity.
1130  *
1131  * @param env           the gas output environment
1132  * @param ent           the entity to be dumped
1133  */
1134 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1135 {
1136         ir_type          *type           = get_entity_type(ent);
1137         ident            *ld_ident       = get_entity_ld_ident(ent);
1138         unsigned          align          = get_type_alignment_bytes(type);
1139         int               emit_as_common = 0;
1140         be_gas_section_t  section        = env->section;
1141         ir_variability    variability    = get_entity_variability(ent);
1142         ir_visibility     visibility     = get_entity_visibility(ent);
1143
1144         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1145                 return;
1146         }
1147
1148         if (section != (be_gas_section_t) -1) {
1149                 emit_as_common = 0;
1150         } else if (variability == variability_constant) {
1151                 /* a constant entity, put it on the rdata */
1152                 section = GAS_SECTION_RODATA;
1153                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1154                                 && ent_is_string_const(ent)) {
1155                         section = GAS_SECTION_CSTRING;
1156                 }
1157         } else if (variability == variability_uninitialized) {
1158                 /* uninitialized entity put it in bss segment */
1159                 section = GAS_SECTION_COMMON;
1160                 if (visibility != visibility_local)
1161                         emit_as_common = 1;
1162         } else {
1163                 section = GAS_SECTION_DATA;
1164         }
1165
1166         if(!emit_as_common) {
1167                 be_gas_emit_switch_section(section);
1168         }
1169
1170         be_dbg_variable(ent);
1171
1172         /* global or not global */
1173         if (visibility == visibility_external_visible && !emit_as_common) {
1174                 be_emit_cstring(".globl\t");
1175                 be_emit_ident(ld_ident);
1176                 be_emit_char('\n');
1177                 be_emit_write_line();
1178         } else if(visibility == visibility_external_allocated) {
1179                 be_emit_cstring(".globl\t");
1180                 be_emit_ident(ld_ident);
1181                 be_emit_char('\n');
1182                 be_emit_write_line();
1183                 /* we can return now... */
1184                 return;
1185         }
1186         /* alignment */
1187         if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1188                         && section != GAS_SECTION_PIC_SYMBOLS) {
1189                 emit_align(align);
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_ELF:
1211                         case GAS_FLAVOUR_MACH_O:
1212                         case GAS_FLAVOUR_YASM:
1213                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1214                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1215                                 be_emit_write_line();
1216                                 break;
1217                         case GAS_FLAVOUR_MINGW:
1218                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1219                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1220                                 be_emit_write_line();
1221                                 break;
1222                         }
1223                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1224                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1225                                 be_emit_cstring("\t.indirect_symbol ");
1226                                 be_emit_ident(get_entity_ident(ent));
1227                                 be_emit_char('\n');
1228                                 be_emit_write_line();
1229                                 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1230                                 be_emit_write_line();
1231                         } else {
1232                                 panic("PIC trampolines not yet supported in this gas mode");
1233                         }
1234                 } else {
1235                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1236                         be_emit_write_line();
1237                 }
1238         } else {
1239                 if (is_atomic_entity(ent)) {
1240                         dump_atomic_init(env, get_atomic_ent_value(ent));
1241                 } else {
1242                         /* sort_compound_ent_values(ent); */
1243
1244                         switch (get_type_tpop_code(get_entity_type(ent))) {
1245                         case tpo_array:
1246                                 if (ent_is_string_const(ent))
1247                                         dump_string_cst(ent);
1248                                 else
1249                                         dump_compound_init(env, ent);
1250                                 break;
1251                         case tpo_struct:
1252                         case tpo_class:
1253                         case tpo_union:
1254                                 dump_compound_init(env, ent);
1255                                 break;
1256                         default:
1257                                 assert(0);
1258                         }
1259                 }
1260         }
1261 }
1262
1263 /**
1264  * Dumps declarations of global variables and the initialization code.
1265  *
1266  * @param gt                a global like type, either the global or the TLS one
1267  * @param env               an environment
1268  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1269  *                          its visited flag set are ignored
1270  */
1271 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1272                                 int only_emit_marked)
1273 {
1274         int i, n = get_compound_n_members(gt);
1275         waitq *worklist = new_waitq();
1276
1277         if (only_emit_marked) {
1278                 for (i = 0; i < n; i++) {
1279                         ir_entity *ent = get_compound_member(gt, i);
1280                         if (is_entity_backend_marked(ent) ||
1281                             get_entity_visibility(ent) != visibility_external_allocated) {
1282                                 waitq_put(worklist, ent);
1283                                 set_entity_backend_marked(ent, 1);
1284                         }
1285                 }
1286         } else {
1287                 for (i = 0; i < n; i++) {
1288                         ir_entity *ent = get_compound_member(gt, i);
1289                         set_entity_backend_marked(ent, 1);
1290                         waitq_put(worklist, ent);
1291                 }
1292         }
1293
1294         env->worklist = worklist;
1295
1296         while (!waitq_empty(worklist)) {
1297                 ir_entity *ent = waitq_get(worklist);
1298
1299                 dump_global(env, ent);
1300         }
1301
1302         del_waitq(worklist);
1303         env->worklist = NULL;
1304 }
1305
1306 /************************************************************************/
1307
1308 /* Generate all entities. */
1309 void be_gas_emit_decls(const be_main_env_t *main_env,
1310                        int only_emit_marked_entities)
1311 {
1312         be_gas_decl_env_t env;
1313         memset(&env, 0, sizeof(env));
1314
1315         env.main_env = main_env;
1316
1317         /* dump global type */
1318         env.section = (be_gas_section_t) -1;
1319         be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1320         env.section = GAS_SECTION_TLS;
1321         be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1322         env.section = GAS_SECTION_CONSTRUCTORS;
1323         be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1324                             only_emit_marked_entities);
1325         env.section = GAS_SECTION_DESTRUCTORS;
1326         be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1327                             only_emit_marked_entities);
1328
1329         env.section = GAS_SECTION_PIC_SYMBOLS;
1330         be_gas_dump_globals(main_env->pic_symbols_type, &env,
1331                             only_emit_marked_entities);
1332
1333         if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1334                 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1335                 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1336                                     only_emit_marked_entities);
1337                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1338                         be_emit_cstring("\t.subsections_via_symbols\n");
1339                         be_emit_write_line();
1340                 }
1341         }
1342 }