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

   1 /*
   2  * Copyright (C) 1995-2007 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 "entity.h"
  42 #include "irprog.h"
  43 #include "pdeq.h"
  44 #include "error.h"
  45
  46 #include "be_t.h"
  47 #include "beemitter.h"
  48 #include "be_dbgout.h"
  49
  50 typedef struct obstack obstack_t;
  51
  52 /** by default, we generate assembler code for the Linux gas */
  53 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_NORMAL;
  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_MAX][GAS_SECTION_MAX] = {
  65                 {
  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                 },
  73                 {
  74                         ".section\t.text",
  75                         ".section\t.data",
  76                         ".section .rdata,\"dr\"",
  77                         ".section\t.bss",
  78                         ".section\t.tbss,\"awT\",@nobits",
  79                         ".section\t.ctors,\"aw\",@progbits"
  80                 }
  81         };
  82
  83         assert(be_gas_flavour >= 0 && be_gas_flavour < GAS_FLAVOUR_MAX);
  84         assert(section >= 0 && section < GAS_SECTION_MAX);
  85         return text[be_gas_flavour][section];
  86 }
  87
  88 /**
  89  * Emit necessary code to switch to a section.
  90  *
  91  * @param env      the emitter environment
  92  * @param section  the section to switch to
  93  */
  94 void be_gas_emit_switch_section(be_emit_env_t *env, be_gas_section_t section) {
  95         be_emit_char(env, '\t');
  96         be_emit_string(env, get_section_name(section));
  97         be_emit_char(env, '\n');
  98         be_emit_write_line(env);
  99 }
 100
 101 typedef struct _ia32_decl_env {
 102         obstack_t *rodata_obst;
 103         obstack_t *data_obst;
 104         obstack_t *bss_obst;
 105         obstack_t *ctor_obst;
 106         const be_main_env_t *main_env;
 107         waitq     *worklist;
 108 } ia32_decl_env_t;
 109
 110 /************************************************************************/
 111
 112 /**
 113  * output a tarval
 114  */
 115 static void dump_arith_tarval(obstack_t *obst, tarval *tv, int bytes)
 116 {
 117         switch (bytes) {
 118
 119         case 1:
 120                 obstack_printf(obst, "0x%02x", get_tarval_sub_bits(tv, 0));
 121                 break;
 122
 123         case 2:
 124                 obstack_printf(obst, "0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 125                 break;
 126
 127         case 4:
 128                 obstack_printf(obst, "0x%02x%02x%02x%02x",
 129                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 130                 break;
 131
 132         case 8:
 133                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x",
 134                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 135                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 136                 break;
 137
 138         case 10:
 139         case 12:
 140                 break;
 141
 142         case 16:
 143                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x"
 144                                                "%02x%02x%02x%02x%02x%02x%02x%02x",
 145                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 146                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 147                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 148                         get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
 149                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
 150                         get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 151                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
 152                         get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 153                 break;
 154
 155
 156         default:
 157                 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
 158                 assert(0);
 159         }
 160 }
 161
 162 /**
 163  * Return the tarval of an atomic initializer.
 164  */
 165 static tarval *get_atomic_init_tv(ir_node *init)
 166 {
 167         for (;;) {
 168                 ir_mode *mode = get_irn_mode(init);
 169
 170                 switch (get_irn_opcode(init)) {
 171
 172                 case iro_Cast:
 173                         init = get_Cast_op(init);
 174                         continue;
 175
 176                 case iro_Conv:
 177                         init = get_Conv_op(init);
 178                         continue;
 179
 180                 case iro_Const:
 181                         return get_Const_tarval(init);
 182
 183                 case iro_SymConst:
 184                         switch (get_SymConst_kind(init)) {
 185                         case symconst_ofs_ent:
 186                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 187
 188                         case symconst_type_size:
 189                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 190
 191                         case symconst_type_align:
 192                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 193
 194                         case symconst_enum_const:
 195                                 return get_enumeration_value(get_SymConst_enum(init));
 196
 197                         default:
 198                                 return NULL;
 199                         }
 200
 201                 default:
 202                         return NULL;
 203                 }
 204         }
 205 }
 206
 207 /**
 208  * dump an atomic value
 209  */
 210 static void do_dump_atomic_init(ia32_decl_env_t *env, obstack_t *obst,
 211                                 ir_node *init)
 212 {
 213         ir_mode *mode = get_irn_mode(init);
 214         int bytes     = get_mode_size_bytes(mode);
 215         tarval *tv;
 216         ir_entity *ent;
 217
 218         switch (get_irn_opcode(init)) {
 219
 220         case iro_Cast:
 221                 do_dump_atomic_init(env, obst, get_Cast_op(init));
 222                 return;
 223
 224         case iro_Conv:
 225                 do_dump_atomic_init(env, obst, get_Conv_op(init));
 226                 return;
 227
 228         case iro_Const:
 229                 tv = get_Const_tarval(init);
 230
 231                 /* it's a arithmetic value */
 232                 dump_arith_tarval(obst, tv, bytes);
 233                 return;
 234
 235         case iro_SymConst:
 236                 switch (get_SymConst_kind(init)) {
 237                 case symconst_addr_name:
 238                         obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
 239                         break;
 240
 241                 case symconst_addr_ent:
 242                         ent = get_SymConst_entity(init);
 243                         if(!entity_visited(ent)) {
 244                                 waitq_put(env->worklist, ent);
 245                                 mark_entity_visited(ent);
 246                         }
 247                         obstack_printf(obst, "%s", get_entity_ld_name(ent));
 248                         break;
 249
 250                 case symconst_ofs_ent:
 251                         ent = get_SymConst_entity(init);
 252 #if 0       /* not needed, is it? */
 253                         if(!entity_visited(ent)) {
 254                                 waitq_put(env->worklist, ent);
 255                                 mark_entity_visited(ent);
 256                         }
 257 #endif
 258                         obstack_printf(obst, "%d", get_entity_offset(ent));
 259                         break;
 260
 261                 case symconst_type_size:
 262                         obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
 263                         break;
 264
 265                 case symconst_type_align:
 266                         obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
 267                         break;
 268
 269                 case symconst_enum_const:
 270                         tv = get_enumeration_value(get_SymConst_enum(init));
 271                         dump_arith_tarval(obst, tv, bytes);
 272                         break;
 273
 274                 default:
 275                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 276                 }
 277                 return;
 278
 279                 case iro_Add:
 280                         do_dump_atomic_init(env, obst, get_Add_left(init));
 281                         obstack_printf(obst, " + ");
 282                         do_dump_atomic_init(env, obst, get_Add_right(init));
 283                         return;
 284
 285                 case iro_Sub:
 286                         do_dump_atomic_init(env, obst, get_Sub_left(init));
 287                         obstack_printf(obst, " - ");
 288                         do_dump_atomic_init(env, obst, get_Sub_right(init));
 289                         return;
 290
 291                 case iro_Mul:
 292                         do_dump_atomic_init(env, obst, get_Mul_left(init));
 293                         obstack_printf(obst, " * ");
 294                         do_dump_atomic_init(env, obst, get_Mul_right(init));
 295                         return;
 296
 297                 default:
 298                         assert(0 && "dump_atomic_init(): unknown IR-node");
 299         }
 300 }
 301
 302 /**
 303  * dumps the type for given size (.byte, .long, ...)
 304  */
 305 static void dump_size_type(obstack_t *obst, int size) {
 306         switch (size) {
 307
 308         case 1:
 309                 obstack_printf(obst, "\t.byte\t");
 310                 break;
 311
 312         case 2:
 313                 obstack_printf(obst, "\t.value\t");
 314                 break;
 315
 316         case 4:
 317                 obstack_printf(obst, "\t.long\t");
 318                 break;
 319
 320         case 8:
 321                 obstack_printf(obst, "\t.quad\t");
 322                 break;
 323
 324         case 10:
 325         case 12:
 326                 /* handled in arith */
 327                 break;
 328
 329         case 16:
 330                 obstack_printf(obst, "\t.octa\t");
 331                 break;
 332
 333         default:
 334                 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
 335                 assert(0);
 336         }
 337 }
 338
 339 /**
 340  * dump an atomic value to an obstack
 341  */
 342 static void dump_atomic_init(ia32_decl_env_t *env, obstack_t *obst,
 343                              ir_node *init)
 344 {
 345         ir_mode *mode = get_irn_mode(init);
 346         int bytes     = get_mode_size_bytes(mode);
 347
 348         dump_size_type(obst, bytes);
 349         do_dump_atomic_init(env, obst, init);
 350         obstack_printf(obst, "\n");
 351 }
 352
 353 /************************************************************************/
 354 /* Routines to dump global variables                                    */
 355 /************************************************************************/
 356
 357 /**
 358  * Determine if an entity is a string constant
 359  * @param ent The entity
 360  * @return 1 if it is a string constant, 0 otherwise
 361  */
 362 static int ent_is_string_const(ir_entity *ent)
 363 {
 364         ir_type *type, *element_type;
 365         ir_mode *mode;
 366         int i, c, n;
 367
 368         type = get_entity_type(ent);
 369
 370         /* if it's an array */
 371         if (!is_Array_type(type))
 372                 return 0;
 373
 374         element_type = get_array_element_type(type);
 375
 376         /* and the array's element type is primitive */
 377         if (!is_Primitive_type(element_type))
 378                 return 0;
 379
 380         /* and the mode of the element type is an int of
 381          * the same size as the byte mode */
 382         mode = get_type_mode(element_type);
 383         if (!mode_is_int(mode)
 384                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 385                 return 0;
 386
 387         /* if it contains only printable chars and a 0 at the end */
 388         n = get_compound_ent_n_values(ent);
 389         for (i = 0; i < n; ++i) {
 390                 ir_node *irn = get_compound_ent_value(ent, i);
 391                 if(get_irn_opcode(irn) != iro_Const)
 392                         return 0;
 393
 394                 c = (int) get_tarval_long(get_Const_tarval(irn));
 395
 396                 if((i < n - 1 && !(isgraph(c) || isspace(c)))
 397                                 || (i == n - 1 && c != '\0'))
 398                         return 0;
 399         }
 400
 401         /* then we can emit it as a string constant */
 402         return 1;
 403 }
 404
 405 /**
 406  * Dump a string constant.
 407  * No checks are made!!
 408  * @param obst The obst to dump on.
 409  * @param ent The entity to dump.
 410  */
 411 static void dump_string_cst(obstack_t *obst, ir_entity *ent)
 412 {
 413         int i, n;
 414
 415         obstack_printf(obst, "\t.string \"");
 416         n = get_compound_ent_n_values(ent);
 417
 418         for (i = 0; i < n-1; ++i) {
 419                 ir_node *irn;
 420                 int c;
 421
 422                 irn = get_compound_ent_value(ent, i);
 423                 c = (int) get_tarval_long(get_Const_tarval(irn));
 424
 425                 switch (c) {
 426                 case '"' : obstack_printf(obst, "\\\""); break;
 427                 case '\n': obstack_printf(obst, "\\n"); break;
 428                 case '\r': obstack_printf(obst, "\\r"); break;
 429                 case '\t': obstack_printf(obst, "\\t"); break;
 430                 case '\\': obstack_printf(obst, "\\\\"); break;
 431                 default  :
 432                         if (isprint(c))
 433                                 obstack_printf(obst, "%c", c);
 434                         else
 435                                 obstack_printf(obst, "\\%o", c);
 436                         break;
 437                 }
 438         }
 439         obstack_printf(obst, "\"\n");
 440 }
 441
 442 static void dump_array_init(ia32_decl_env_t *env, obstack_t *obst,
 443                             ir_entity *ent)
 444 {
 445         const ir_type *ty = get_entity_type(ent);
 446         int i;
 447         int filler;
 448         int size = 0;
 449
 450         /* potential spare values should be already included! */
 451         for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
 452                 ir_entity *step = get_compound_ent_value_member(ent, i);
 453                 ir_type *stype = get_entity_type(step);
 454
 455                 if (get_type_mode(stype)) {
 456                         int align = (get_type_alignment_bits(stype) + 7) >> 3;
 457                         int n     = size % align;
 458
 459                         if (n > 0) {
 460                                 obstack_printf(obst, "\t.zero\t%d\n", align - n);
 461                                 size += align - n;
 462                         }
 463                 }
 464                 dump_atomic_init(env, obst, get_compound_ent_value(ent, i));
 465                 size += get_type_size_bytes(stype);
 466         }
 467         filler = get_type_size_bytes(ty) - size;
 468
 469         if (filler > 0)
 470                 obstack_printf(obst, "\t.skip\t%d\n", filler);
 471 }
 472
 473 enum normal_or_bitfield_kind {
 474         NORMAL = 0,
 475         BITFIELD
 476 };
 477
 478 typedef struct {
 479         enum normal_or_bitfield_kind kind;
 480         union {
 481                 ir_node *value;
 482                 unsigned char bf_val;
 483         } v;
 484 } normal_or_bitfield;
 485
 486 /**
 487  * Dump an initializer for a compound entity.
 488  */
 489 static void dump_compound_init(ia32_decl_env_t *env, obstack_t *obst,
 490                                ir_entity *ent)
 491 {
 492         normal_or_bitfield *vals;
 493         int i, j, n = get_compound_ent_n_values(ent);
 494         int last_ofs;
 495
 496         /* Find the initializer size. Sorrily gcc support a nasty feature:
 497            The last field of a compound may be a flexible array. This allows
 498            initializers bigger than the type size. */
 499         last_ofs = get_type_size_bytes(get_entity_type(ent));
 500         for (i = 0; i < n; ++i) {
 501                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 502                 int bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
 503                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 504                 int path_len = get_compound_graph_path_length(path);
 505                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 506                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 507
 508                 offset += (value_len + bits_remainder + 7) >> 3;
 509
 510                 if (offset > last_ofs) {
 511                         last_ofs = offset;
 512                 }
 513         }
 514
 515         /*
 516          * In the worst case, every initializer allocates one byte.
 517          * Moreover, initializer might be big, do not allocate on stack.
 518          */
 519         vals = xcalloc(last_ofs, sizeof(vals[0]));
 520
 521         /* collect the values and store them at the offsets */
 522         for (i = 0; i < n; ++i) {
 523                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 524                 int path_len = get_compound_graph_path_length(path);
 525                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 526                 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
 527                 ir_node *value = get_compound_ent_value(ent, i);
 528                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 529                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 530                 assert(offset >= 0);
 531                 assert(offset_bits >= 0);
 532
 533                 if (offset_bits != 0 ||
 534                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
 535                         tarval *shift, *shifted;
 536                         tarval *tv = get_atomic_init_tv(value);
 537                         if (tv == NULL) {
 538                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
 539                                       get_entity_ld_name(ent));
 540                         }
 541                         tv = tarval_convert_to(tv, mode_Lu);
 542                         shift = new_tarval_from_long(offset_bits, mode_Is);
 543                         shifted = tarval_shl(tv, shift);
 544                         if (shifted == tarval_bad || shifted == tarval_undefined) {
 545                                 panic("Couldn't shift numeric value for bitfield initializer '%s'\n",
 546                                       get_entity_ld_name(ent));
 547                         }
 548
 549                         for (j = 0; value_len > 0; ++j) {
 550                                 assert(offset + j < last_ofs);
 551                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
 552                                 vals[offset + j].kind = BITFIELD;
 553                                 vals[offset + j].v.bf_val |= get_tarval_sub_bits(shifted, j);
 554                                 value_len -= 8 - offset_bits;
 555                                 offset_bits = 0;
 556                         }
 557                 } else {
 558                         assert(offset < last_ofs);
 559                         assert(vals[offset].kind == NORMAL);
 560                         assert(vals[offset].v.value == NULL);
 561                         vals[offset].v.value = value;
 562                 }
 563         }
 564
 565         /* now write them sorted */
 566         for (i = 0; i < last_ofs; ) {
 567                 int space = 0, skip = 0;
 568                 if (vals[i].kind == NORMAL) {
 569                         if(vals[i].v.value != NULL) {
 570                                 dump_atomic_init(env, obst, vals[i].v.value);
 571                                 skip = get_mode_size_bytes(get_irn_mode(vals[i].v.value)) - 1;
 572                         } else {
 573                                 space = 1;
 574                         }
 575                 } else {
 576                         assert(vals[i].kind == BITFIELD);
 577                         obstack_printf(obst, "\t.byte\t%d\n", vals[i].v.bf_val);
 578                 }
 579
 580                 ++i;
 581                 space = 0;
 582                 while (i < last_ofs && vals[i].kind == NORMAL && vals[i].v.value == NULL) {
 583                         ++space;
 584                         ++i;
 585                 }
 586                 space -= skip;
 587                 assert(space >= 0);
 588
 589                 /* a gap */
 590                 if (space > 0)
 591                         obstack_printf(obst, "\t.skip\t%d\n", space);
 592         }
 593         xfree(vals);
 594 }
 595
 596 /**
 597  * Dump a global entity.
 598  */
 599 static void dump_global(ia32_decl_env_t *env, ir_entity *ent, int emit_commons)
 600 {
 601         obstack_t *obst;
 602         ir_type *type = get_entity_type(ent);
 603         const char *ld_name = get_entity_ld_name(ent);
 604         ir_variability variability = get_entity_variability(ent);
 605         ir_visibility visibility = get_entity_visibility(ent);
 606         int align = get_type_alignment_bytes(type);
 607         int emit_as_common = 0;
 608
 609         obst = env->data_obst;
 610         if (is_Method_type(type)) {
 611                 if (get_method_img_section(ent) == section_constructors) {
 612                         obst = env->ctor_obst;
 613                         obstack_printf(obst, ".balign\t%d\n", align);
 614                         dump_size_type(obst, align);
 615                         obstack_printf(obst, "%s\n", ld_name);
 616                 }
 617                 return;
 618         } else if (variability == variability_constant) {
 619                 /* a constant entity, put it on the rdata */
 620                 obst = env->rodata_obst;
 621         } else if (variability == variability_uninitialized) {
 622                 /* uninitialized entity put it in bss segment */
 623                 obst = env->bss_obst;
 624                 if(emit_commons && visibility != visibility_local)
 625                         emit_as_common = 1;
 626         }
 627
 628         be_dbg_variable(env->main_env->db_handle, obst, ent);
 629
 630         /* global or not global */
 631         if (visibility == visibility_external_visible && !emit_as_common) {
 632                 obstack_printf(obst, ".global\t%s\n", ld_name);
 633         } else if(visibility == visibility_external_allocated) {
 634                 obstack_printf(obst, ".global\t%s\n", ld_name);
 635                 /* we can return now... */
 636                 return;
 637         }
 638         /* alignment */
 639         if (align > 1 && !emit_as_common) {
 640                 obstack_printf(obst, ".balign\t%d\n", align);
 641         }
 642
 643         if (!emit_as_common) {
 644                 obstack_printf(obst, "%s:\n", ld_name);
 645         }
 646
 647         if (variability == variability_uninitialized) {
 648                 if(emit_as_common) {
 649                         obstack_printf(obst, "\t.comm %s,%d,%d\n",
 650                                         ld_name, get_type_size_bytes(type), align);
 651                 } else {
 652                         obstack_printf(obst, "\t.zero %d\n", get_type_size_bytes(type));
 653                 }
 654         } else if (is_atomic_type(type)) {
 655                 dump_atomic_init(env, obst, get_atomic_ent_value(ent));
 656         } else if (ent_is_string_const(ent)) {
 657                 dump_string_cst(obst, ent);
 658         } else if (is_Array_type(type)) {
 659                 dump_array_init(env, obst, ent);
 660         } else if (is_compound_type(type)) {
 661                 dump_compound_init(env, obst, ent);
 662         } else {
 663                 assert(0 && "unsupported type");
 664         }
 665 }
 666
 667 /**
 668  * Dumps declarations of global variables and the initialization code.
 669  */
 670 static void ia32_dump_globals(ir_type *gt, ia32_decl_env_t *env,
 671                               int emit_commons, int only_emit_marked)
 672 {
 673         int i, n = get_compound_n_members(gt);
 674         waitq *worklist = new_waitq();
 675
 676         if(only_emit_marked) {
 677                 for (i = 0; i < n; i++) {
 678                         ir_entity *ent = get_compound_member(gt, i);
 679                         if(entity_visited(ent) ||
 680                                         get_entity_visibility(ent) != visibility_external_allocated) {
 681                                 waitq_put(worklist, ent);
 682                                 mark_entity_visited(ent);
 683                         }
 684                 }
 685         } else {
 686                 inc_master_type_visited();
 687                 for (i = 0; i < n; i++) {
 688                         ir_entity *ent = get_compound_member(gt, i);
 689                         mark_entity_visited(ent);
 690                         waitq_put(worklist, ent);
 691                 }
 692         }
 693
 694         env->worklist = worklist;
 695
 696         while(!waitq_empty(worklist)) {
 697                 ir_entity *ent = waitq_get(worklist);
 698
 699                 dump_global(env, ent, emit_commons);
 700         }
 701
 702         del_waitq(worklist);
 703         env->worklist = NULL;
 704 }
 705
 706 /************************************************************************/
 707
 708 void be_gas_emit_decls(be_emit_env_t *emit, const be_main_env_t *main_env,
 709                        int only_emit_marked_entities)
 710 {
 711         ia32_decl_env_t env;
 712         obstack_t rodata, data, bss, ctor;
 713         int    size;
 714         char   *cp;
 715
 716         /* dump the global type */
 717         obstack_init(&rodata);
 718         obstack_init(&data);
 719         obstack_init(&bss);
 720         obstack_init(&ctor);
 721
 722         env.rodata_obst = &rodata;
 723         env.data_obst   = &data;
 724         env.bss_obst    = &bss;
 725         env.ctor_obst   = &ctor;
 726         env.main_env    = main_env;
 727
 728         ia32_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
 729
 730         size = obstack_object_size(&data);
 731         cp   = obstack_finish(&data);
 732         if (size > 0) {
 733                 be_gas_emit_switch_section(emit, GAS_SECTION_DATA);
 734                 be_emit_string_len(emit, cp, size);
 735                 be_emit_write_line(emit);
 736         }
 737
 738         size = obstack_object_size(&rodata);
 739         cp   = obstack_finish(&rodata);
 740         if (size > 0) {
 741                 be_gas_emit_switch_section(emit, GAS_SECTION_RODATA);
 742                 be_emit_string_len(emit, cp, size);
 743                 be_emit_write_line(emit);
 744         }
 745
 746         size = obstack_object_size(&bss);
 747         cp   = obstack_finish(&bss);
 748         if (size > 0) {
 749                 be_gas_emit_switch_section(emit, GAS_SECTION_COMMON);
 750                 be_emit_string_len(emit, cp, size);
 751                 be_emit_write_line(emit);
 752         }
 753
 754         size = obstack_object_size(&ctor);
 755         cp   = obstack_finish(&ctor);
 756         if (size > 0) {
 757                 be_gas_emit_switch_section(emit, GAS_SECTION_CTOR);
 758                 be_emit_string_len(emit, cp, size);
 759                 be_emit_write_line(emit);
 760         }
 761
 762         obstack_free(&rodata, NULL);
 763         obstack_free(&data, NULL);
 764         obstack_free(&bss, NULL);
 765         obstack_free(&ctor, NULL);
 766
 767         /* dump the Thread Local Storage */
 768         obstack_init(&data);
 769
 770         env.rodata_obst = &data;
 771         env.data_obst   = &data;
 772         env.bss_obst    = &data;
 773         env.ctor_obst   = NULL;
 774
 775         ia32_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
 776
 777         size = obstack_object_size(&data);
 778         cp   = obstack_finish(&data);
 779         if (size > 0) {
 780                 be_gas_emit_switch_section(emit, GAS_SECTION_TLS);
 781                 be_emit_cstring(emit, ".balign\t32\n");
 782                 be_emit_write_line(emit);
 783                 be_emit_string_len(emit, cp, size);
 784                 be_emit_write_line(emit);
 785         }
 786
 787         obstack_free(&data, NULL);
 788 }