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 "irprog.h"
  42 #include "pdeq.h"
  43 #include "error.h"
  44
  45 #include "be_t.h"
  46 #include "beemitter.h"
  47 #include "be_dbgout.h"
  48
  49 typedef struct obstack obstack_t;
  50
  51 /** by default, we generate assembler code for the Linux gas */
  52 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_NORMAL;
  53
  54 /**
  55  * Return the pseudo-instruction to be issued for a section switch
  56  * depending on the current flavour.
  57  *
  58  * @param section  the section to switch to
  59  *
  60  * @return  the pseudo-instruction
  61  */
  62 static const char *get_section_name(be_gas_section_t section) {
  63         static const char *text[GAS_FLAVOUR_MAX][GAS_SECTION_MAX] = {
  64                 {
  65                         ".section\t.text",
  66                         ".section\t.data",
  67                         ".section\t.rodata",
  68                         ".section\t.bss",
  69                         ".section\t.tbss,\"awT\",@nobits",
  70                         ".section\t.ctors,\"aw\",@progbits"
  71                 },
  72                 {
  73                         ".section\t.text",
  74                         ".section\t.data",
  75                         ".section .rdata,\"dr\"",
  76                         ".section\t.bss",
  77                         ".section\t.tbss,\"awT\",@nobits",
  78                         ".section\t.ctors,\"aw\",@progbits"
  79                 }
  80         };
  81
  82         assert((int) be_gas_flavour >= 0 && be_gas_flavour < GAS_FLAVOUR_MAX);
  83         assert((int) section >= 0 && section < GAS_SECTION_MAX);
  84         return text[be_gas_flavour][section];
  85 }
  86
  87 /**
  88  * Emit necessary code to switch to a section.
  89  *
  90  * @param env      the emitter environment
  91  * @param section  the section to switch to
  92  */
  93 void be_gas_emit_switch_section(be_emit_env_t *env, be_gas_section_t section) {
  94         be_emit_char(env, '\t');
  95         be_emit_string(env, get_section_name(section));
  96         be_emit_char(env, '\n');
  97         be_emit_write_line(env);
  98 }
  99
 100 /**
 101  * An environment containing all needed dumper data.
 102  * Currently we create the file completely in memory first, then
 103  * write it to the disk. This is an artifact from the old C-generating backend
 104  * and even there NOT needed. So we might change it in the future.
 105  */
 106 typedef struct _be_gas_decl_env {
 107         obstack_t *rodata_obst;        /**< An obstack that will be filled with all rodata entities. */
 108         obstack_t *data_obst;          /**< An obstack that will be filled with the initialized entities. */
 109         obstack_t *bss_obst;           /**< An obstack that will be filled with the uninitialized entities. */
 110         obstack_t *ctor_obst;          /**< An obstack that will be filled with the constructor entities. */
 111         const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
 112         waitq     *worklist;           /**< A worklist we use to place not yet handled entities on. */
 113 } be_gas_decl_env_t;
 114
 115 /************************************************************************/
 116
 117 /**
 118  * Output a tarval.
 119  *
 120  * @param obst   the obstack where the data is written too
 121  * @param tv     the tarval
 122  * @param bytes  the width of the tarvals value in bytes
 123  */
 124 static void dump_arith_tarval(obstack_t *obst, tarval *tv, int bytes)
 125 {
 126         switch (bytes) {
 127
 128         case 1:
 129                 obstack_printf(obst, "0x%02x", get_tarval_sub_bits(tv, 0));
 130                 break;
 131
 132         case 2:
 133                 obstack_printf(obst, "0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 134                 break;
 135
 136         case 4:
 137                 obstack_printf(obst, "0x%02x%02x%02x%02x",
 138                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 139                 break;
 140
 141         case 8:
 142                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x",
 143                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 144                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 145                 break;
 146
 147         case 10:
 148         case 12:
 149                 break;
 150
 151         case 16:
 152                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x"
 153                                                "%02x%02x%02x%02x%02x%02x%02x%02x",
 154                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 155                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 156                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 157                         get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
 158                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
 159                         get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 160                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
 161                         get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 162                 break;
 163
 164
 165         default:
 166                 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
 167                 assert(0);
 168         }
 169 }
 170
 171 /**
 172  * Return the tarval of an atomic initializer.
 173  *
 174  * @param init  a node representing the initializer (on teh const code irg)
 175  *
 176  * @return the tarval
 177  */
 178 static tarval *get_atomic_init_tv(ir_node *init)
 179 {
 180         for (;;) {
 181                 ir_mode *mode = get_irn_mode(init);
 182
 183                 switch (get_irn_opcode(init)) {
 184
 185                 case iro_Cast:
 186                         init = get_Cast_op(init);
 187                         continue;
 188
 189                 case iro_Conv:
 190                         init = get_Conv_op(init);
 191                         continue;
 192
 193                 case iro_Const:
 194                         return get_Const_tarval(init);
 195
 196                 case iro_SymConst:
 197                         switch (get_SymConst_kind(init)) {
 198                         case symconst_type_size:
 199                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 200
 201                         case symconst_type_align:
 202                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 203
 204                         case symconst_ofs_ent:
 205                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 206
 207                         case symconst_enum_const:
 208                                 return get_enumeration_value(get_SymConst_enum(init));
 209
 210                         default:
 211                                 return NULL;
 212                         }
 213
 214                 default:
 215                         return NULL;
 216                 }
 217         }
 218 }
 219
 220 /**
 221  * Dump an atomic value.
 222  *
 223  * @param env   the gas output environment
 224  * @param obst  an obstack the output is written to
 225  * @param init  a node representing the atomic value (on the const code irg)
 226  */
 227 static void do_dump_atomic_init(be_gas_decl_env_t *env, obstack_t *obst,
 228                                 ir_node *init)
 229 {
 230         ir_mode *mode = get_irn_mode(init);
 231         int bytes     = get_mode_size_bytes(mode);
 232         tarval *tv;
 233         ir_entity *ent;
 234
 235         switch (get_irn_opcode(init)) {
 236
 237         case iro_Cast:
 238                 do_dump_atomic_init(env, obst, get_Cast_op(init));
 239                 return;
 240
 241         case iro_Conv:
 242                 do_dump_atomic_init(env, obst, get_Conv_op(init));
 243                 return;
 244
 245         case iro_Const:
 246                 tv = get_Const_tarval(init);
 247
 248                 /* it's a arithmetic value */
 249                 dump_arith_tarval(obst, tv, bytes);
 250                 return;
 251
 252         case iro_SymConst:
 253                 switch (get_SymConst_kind(init)) {
 254                 case symconst_addr_name:
 255                         obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
 256                         break;
 257
 258                 case symconst_addr_ent:
 259                         ent = get_SymConst_entity(init);
 260                         if(!is_entity_backend_marked(ent)) {
 261                                 waitq_put(env->worklist, ent);
 262                                 set_entity_backend_marked(ent, 1);
 263                         }
 264                         obstack_printf(obst, "%s", get_entity_ld_name(ent));
 265                         break;
 266
 267                 case symconst_ofs_ent:
 268                         ent = get_SymConst_entity(init);
 269 #if 0       /* not needed, is it? */
 270                         if(!is_entity_backend_marked(ent)) {
 271                                 waitq_put(env->worklist, ent);
 272                                 set_entity_backend_marked(ent, 1);
 273                         }
 274 #endif
 275                         obstack_printf(obst, "%d", get_entity_offset(ent));
 276                         break;
 277
 278                 case symconst_type_size:
 279                         obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
 280                         break;
 281
 282                 case symconst_type_align:
 283                         obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
 284                         break;
 285
 286                 case symconst_enum_const:
 287                         tv = get_enumeration_value(get_SymConst_enum(init));
 288                         dump_arith_tarval(obst, tv, bytes);
 289                         break;
 290
 291                 default:
 292                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 293                 }
 294                 return;
 295
 296                 case iro_Add:
 297                         do_dump_atomic_init(env, obst, get_Add_left(init));
 298                         obstack_printf(obst, " + ");
 299                         do_dump_atomic_init(env, obst, get_Add_right(init));
 300                         return;
 301
 302                 case iro_Sub:
 303                         do_dump_atomic_init(env, obst, get_Sub_left(init));
 304                         obstack_printf(obst, " - ");
 305                         do_dump_atomic_init(env, obst, get_Sub_right(init));
 306                         return;
 307
 308                 case iro_Mul:
 309                         do_dump_atomic_init(env, obst, get_Mul_left(init));
 310                         obstack_printf(obst, " * ");
 311                         do_dump_atomic_init(env, obst, get_Mul_right(init));
 312                         return;
 313
 314                 default:
 315                         assert(0 && "dump_atomic_init(): unknown IR-node");
 316         }
 317 }
 318
 319 /**
 320  * Dumps the type for given size (.byte, .long, ...)
 321  *
 322  * @param obst  an obstack the output is written to
 323  * @param size  the size in bytes
 324  */
 325 static void dump_size_type(obstack_t *obst, int size) {
 326         switch (size) {
 327
 328         case 1:
 329                 obstack_printf(obst, "\t.byte\t");
 330                 break;
 331
 332         case 2:
 333                 obstack_printf(obst, "\t.value\t");
 334                 break;
 335
 336         case 4:
 337                 obstack_printf(obst, "\t.long\t");
 338                 break;
 339
 340         case 8:
 341                 obstack_printf(obst, "\t.quad\t");
 342                 break;
 343
 344         case 10:
 345         case 12:
 346                 /* handled in arith */
 347                 break;
 348
 349         case 16:
 350                 obstack_printf(obst, "\t.octa\t");
 351                 break;
 352
 353         default:
 354                 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
 355                 assert(0);
 356         }
 357 }
 358
 359 /**
 360  * Dump an atomic value to an obstack.
 361  *
 362  * @param env   the gas output environment
 363  * @param obst  an obstack the output is written to
 364  * @param init  a node representing the atomic value (on the const code irg)
 365  */
 366 static void dump_atomic_init(be_gas_decl_env_t *env, obstack_t *obst,
 367                              ir_node *init)
 368 {
 369         ir_mode *mode = get_irn_mode(init);
 370         int bytes     = get_mode_size_bytes(mode);
 371
 372         dump_size_type(obst, bytes);
 373         do_dump_atomic_init(env, obst, init);
 374         obstack_printf(obst, "\n");
 375 }
 376
 377 /************************************************************************/
 378 /* Routines to dump global variables                                    */
 379 /************************************************************************/
 380
 381 /**
 382  * Determine if an entity is a string constant
 383  * @param ent The entity
 384  * @return 1 if it is a string constant, 0 otherwise
 385  */
 386 static int ent_is_string_const(ir_entity *ent)
 387 {
 388         ir_type *type, *element_type;
 389         ir_mode *mode;
 390         int i, c, n;
 391
 392         type = get_entity_type(ent);
 393
 394         /* if it's an array */
 395         if (!is_Array_type(type))
 396                 return 0;
 397
 398         element_type = get_array_element_type(type);
 399
 400         /* and the array's element type is primitive */
 401         if (!is_Primitive_type(element_type))
 402                 return 0;
 403
 404         /* and the mode of the element type is an int of
 405          * the same size as the byte mode */
 406         mode = get_type_mode(element_type);
 407         if (!mode_is_int(mode)
 408                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 409                 return 0;
 410
 411         /* if it contains only printable chars and a 0 at the end */
 412         n = get_compound_ent_n_values(ent);
 413         for (i = 0; i < n; ++i) {
 414                 ir_node *irn = get_compound_ent_value(ent, i);
 415                 if(get_irn_opcode(irn) != iro_Const)
 416                         return 0;
 417
 418                 c = (int) get_tarval_long(get_Const_tarval(irn));
 419
 420                 if((i < n - 1 && !(isgraph(c) || isspace(c)))
 421                                 || (i == n - 1 && c != '\0'))
 422                         return 0;
 423         }
 424
 425         /* then we can emit it as a string constant */
 426         return 1;
 427 }
 428
 429 /**
 430  * Dump a string constant.
 431  * No checks are made!!
 432  *
 433  * @param obst The obst to dump on.
 434  * @param ent  The entity to dump.
 435  */
 436 static void dump_string_cst(obstack_t *obst, ir_entity *ent)
 437 {
 438         int      i, n;
 439         ir_type *type;
 440         int      type_size;
 441         int      remaining_space;
 442
 443         obstack_printf(obst, "\t.string \"");
 444         n = get_compound_ent_n_values(ent);
 445
 446         for (i = 0; i < n-1; ++i) {
 447                 ir_node *irn;
 448                 int c;
 449
 450                 irn = get_compound_ent_value(ent, i);
 451                 c = (int) get_tarval_long(get_Const_tarval(irn));
 452
 453                 switch (c) {
 454                 case '"' : obstack_printf(obst, "\\\""); break;
 455                 case '\n': obstack_printf(obst, "\\n"); break;
 456                 case '\r': obstack_printf(obst, "\\r"); break;
 457                 case '\t': obstack_printf(obst, "\\t"); break;
 458                 case '\\': obstack_printf(obst, "\\\\"); break;
 459                 default  :
 460                         if (isprint(c))
 461                                 obstack_printf(obst, "%c", c);
 462                         else
 463                                 obstack_printf(obst, "\\%o", c);
 464                         break;
 465                 }
 466         }
 467         obstack_printf(obst, "\"\n");
 468
 469         type            = get_entity_type(ent);
 470         type_size       = get_type_size_bytes(type);
 471         remaining_space = type_size - n;
 472         assert(remaining_space >= 0);
 473         if(remaining_space > 0) {
 474                 obstack_printf(obst, "\t.skip\t%d\n", remaining_space);
 475         }
 476 }
 477
 478 enum normal_or_bitfield_kind {
 479         NORMAL = 0,
 480         BITFIELD
 481 };
 482
 483 typedef struct {
 484         enum normal_or_bitfield_kind kind;
 485         union {
 486                 ir_node *value;
 487                 unsigned char bf_val;
 488         } v;
 489 } normal_or_bitfield;
 490
 491 /**
 492  * Dump an initializer for a compound entity.
 493  */
 494 static void dump_compound_init(be_gas_decl_env_t *env, obstack_t *obst,
 495                                ir_entity *ent)
 496 {
 497         normal_or_bitfield *vals;
 498         int i, j, n = get_compound_ent_n_values(ent);
 499         int last_ofs;
 500
 501         /* Find the initializer size. Sorrily gcc support a nasty feature:
 502            The last field of a compound may be a flexible array. This allows
 503            initializers bigger than the type size. */
 504         last_ofs = get_type_size_bytes(get_entity_type(ent));
 505         for (i = 0; i < n; ++i) {
 506                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 507                 int bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
 508                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 509                 int path_len = get_compound_graph_path_length(path);
 510                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 511                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 512
 513                 offset += (value_len + bits_remainder + 7) >> 3;
 514
 515                 if (offset > last_ofs) {
 516                         last_ofs = offset;
 517                 }
 518         }
 519
 520         /*
 521          * In the worst case, every initializer allocates one byte.
 522          * Moreover, initializer might be big, do not allocate on stack.
 523          */
 524         vals = xcalloc(last_ofs, sizeof(vals[0]));
 525
 526         /* collect the values and store them at the offsets */
 527         for (i = 0; i < n; ++i) {
 528                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 529                 int path_len = get_compound_graph_path_length(path);
 530                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 531                 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
 532                 ir_node *value = get_compound_ent_value(ent, i);
 533                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 534                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 535                 assert(offset >= 0);
 536                 assert(offset_bits >= 0);
 537
 538                 if (offset_bits != 0 ||
 539                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
 540                         tarval *shift, *shifted;
 541                         tarval *tv = get_atomic_init_tv(value);
 542                         if (tv == NULL) {
 543                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
 544                                       get_entity_ld_name(ent));
 545                         }
 546                         tv = tarval_convert_to(tv, mode_Lu);
 547                         shift = new_tarval_from_long(offset_bits, mode_Is);
 548                         shifted = tarval_shl(tv, shift);
 549                         if (shifted == tarval_bad || shifted == tarval_undefined) {
 550                                 panic("Couldn't shift numeric value for bitfield initializer '%s'\n",
 551                                       get_entity_ld_name(ent));
 552                         }
 553
 554                         for (j = 0; value_len > 0; ++j) {
 555                                 assert(offset + j < last_ofs);
 556                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
 557                                 vals[offset + j].kind = BITFIELD;
 558                                 vals[offset + j].v.bf_val |= get_tarval_sub_bits(shifted, j);
 559                                 value_len -= 8 - offset_bits;
 560                                 offset_bits = 0;
 561                         }
 562                 } else {
 563                         assert(offset < last_ofs);
 564                         assert(vals[offset].kind == NORMAL);
 565                         assert(vals[offset].v.value == NULL);
 566                         vals[offset].v.value = value;
 567                 }
 568         }
 569
 570         /* now write them sorted */
 571         for (i = 0; i < last_ofs; ) {
 572                 int space = 0, skip = 0;
 573                 if (vals[i].kind == NORMAL) {
 574                         if(vals[i].v.value != NULL) {
 575                                 dump_atomic_init(env, obst, vals[i].v.value);
 576                                 skip = get_mode_size_bytes(get_irn_mode(vals[i].v.value)) - 1;
 577                         } else {
 578                                 space = 1;
 579                         }
 580                 } else {
 581                         assert(vals[i].kind == BITFIELD);
 582                         obstack_printf(obst, "\t.byte\t%d\n", vals[i].v.bf_val);
 583                 }
 584
 585                 ++i;
 586                 while (i < last_ofs && vals[i].kind == NORMAL && vals[i].v.value == NULL) {
 587                         ++space;
 588                         ++i;
 589                 }
 590                 space -= skip;
 591                 assert(space >= 0);
 592
 593                 /* a gap */
 594                 if (space > 0)
 595                         obstack_printf(obst, "\t.skip\t%d\n", space);
 596         }
 597         xfree(vals);
 598 }
 599
 600 /**
 601  * Dump a global entity.
 602  *
 603  * @param env           the gas output environment
 604  * @param ent           the entity to be dumped
 605  * @param emit_commons  if non-zero, emit commons (non-local uninitialized entities)
 606  */
 607 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent, int emit_commons)
 608 {
 609         obstack_t *obst;
 610         ir_type *type = get_entity_type(ent);
 611         const char *ld_name = get_entity_ld_name(ent);
 612         int align = get_type_alignment_bytes(type);
 613         int emit_as_common = 0;
 614         ir_variability variability;
 615         ir_visibility visibility;
 616
 617         obst = env->data_obst;
 618         if (is_Method_type(type)) {
 619                 if (get_method_img_section(ent) == section_constructors) {
 620                         obst = env->ctor_obst;
 621                         obstack_printf(obst, ".balign\t%d\n", align);
 622                         dump_size_type(obst, align);
 623                         obstack_printf(obst, "%s\n", ld_name);
 624                 }
 625                 return;
 626         }
 627
 628         variability = get_entity_variability(ent);
 629         visibility = get_entity_visibility(ent);
 630         if (variability == variability_constant) {
 631                 /* a constant entity, put it on the rdata */
 632                 obst = env->rodata_obst;
 633         } else if (variability == variability_uninitialized) {
 634                 /* uninitialized entity put it in bss segment */
 635                 obst = env->bss_obst;
 636                 if (emit_commons && visibility != visibility_local)
 637                         emit_as_common = 1;
 638         }
 639
 640         be_dbg_variable(env->main_env->db_handle, obst, ent);
 641
 642         /* global or not global */
 643         if (visibility == visibility_external_visible && !emit_as_common) {
 644                 obstack_printf(obst, ".global\t%s\n", ld_name);
 645         } else if(visibility == visibility_external_allocated) {
 646                 obstack_printf(obst, ".global\t%s\n", ld_name);
 647                 /* we can return now... */
 648                 return;
 649         }
 650         /* alignment */
 651         if (align > 1 && !emit_as_common) {
 652                 obstack_printf(obst, ".balign\t%d\n", align);
 653         }
 654
 655         if (!emit_as_common) {
 656                 obstack_printf(obst, "%s:\n", ld_name);
 657         }
 658
 659         if (variability == variability_uninitialized) {
 660                 if(emit_as_common) {
 661                         if (be_gas_flavour == GAS_FLAVOUR_NORMAL)
 662                                 obstack_printf(obst, "\t.comm %s,%d,%d\n",
 663                                         ld_name, get_type_size_bytes(type), align);
 664                         else
 665                                 obstack_printf(obst, "\t.comm %s,%d # %d\n",
 666                                         ld_name, get_type_size_bytes(type), align);
 667                 } else {
 668                         obstack_printf(obst, "\t.zero %d\n", get_type_size_bytes(type));
 669                 }
 670         } else {
 671                 if (is_atomic_entity(ent)) {
 672                         dump_atomic_init(env, obst, get_atomic_ent_value(ent));
 673                 } else {
 674                         /* sort_compound_ent_values(ent); */
 675
 676                         switch (get_type_tpop_code(get_entity_type(ent))) {
 677                         case tpo_array:
 678                                 if (ent_is_string_const(ent))
 679                                         dump_string_cst(obst, ent);
 680                                 else
 681                                         dump_compound_init(env, obst, ent);
 682                                 break;
 683                         case tpo_struct:
 684                         case tpo_class:
 685                         case tpo_union:
 686                                 dump_compound_init(env, obst, ent);
 687                                 break;
 688                         default:
 689                                 assert(0);
 690                         }
 691                 }
 692         }
 693 }
 694
 695 /**
 696  * Dumps declarations of global variables and the initialization code.
 697  *
 698  * @param gt                a global like type, either the global or the TLS one
 699  * @param env               an environment
 700  * @param emit_commons      if non-zero, emit commons (non-local uninitialized entities)
 701  * @param only_emit_marked  if non-zero, external allocated entities that do not have
 702  *                          its visited flag set are ignored
 703  */
 704 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
 705                               int emit_commons, int only_emit_marked)
 706 {
 707         int i, n = get_compound_n_members(gt);
 708         waitq *worklist = new_waitq();
 709
 710         if (only_emit_marked) {
 711                 for (i = 0; i < n; i++) {
 712                         ir_entity *ent = get_compound_member(gt, i);
 713                         if (is_entity_backend_marked(ent) ||
 714                             get_entity_visibility(ent) != visibility_external_allocated) {
 715                                 waitq_put(worklist, ent);
 716                                 set_entity_backend_marked(ent, 1);
 717                         }
 718                 }
 719         } else {
 720                 for (i = 0; i < n; i++) {
 721                         ir_entity *ent = get_compound_member(gt, i);
 722                         set_entity_backend_marked(ent, 1);
 723                         waitq_put(worklist, ent);
 724                 }
 725         }
 726
 727         env->worklist = worklist;
 728
 729         while (!waitq_empty(worklist)) {
 730                 ir_entity *ent = waitq_get(worklist);
 731
 732                 dump_global(env, ent, emit_commons);
 733         }
 734
 735         del_waitq(worklist);
 736         env->worklist = NULL;
 737 }
 738
 739 /************************************************************************/
 740
 741 /* Generate all entities. */
 742 void be_gas_emit_decls(be_emit_env_t *emit, const be_main_env_t *main_env,
 743                        int only_emit_marked_entities)
 744 {
 745         be_gas_decl_env_t env;
 746         obstack_t rodata, data, bss, ctor;
 747         int    size;
 748         char   *cp;
 749
 750         /* dump the global type */
 751         obstack_init(&rodata);
 752         obstack_init(&data);
 753         obstack_init(&bss);
 754         obstack_init(&ctor);
 755
 756         env.rodata_obst = &rodata;
 757         env.data_obst   = &data;
 758         env.bss_obst    = &bss;
 759         env.ctor_obst   = &ctor;
 760         env.main_env    = main_env;
 761
 762         be_gas_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
 763
 764         size = obstack_object_size(&data);
 765         cp   = obstack_finish(&data);
 766         if (size > 0) {
 767                 be_gas_emit_switch_section(emit, GAS_SECTION_DATA);
 768                 be_emit_string_len(emit, cp, size);
 769                 be_emit_write_line(emit);
 770         }
 771
 772         size = obstack_object_size(&rodata);
 773         cp   = obstack_finish(&rodata);
 774         if (size > 0) {
 775                 be_gas_emit_switch_section(emit, GAS_SECTION_RODATA);
 776                 be_emit_string_len(emit, cp, size);
 777                 be_emit_write_line(emit);
 778         }
 779
 780         size = obstack_object_size(&bss);
 781         cp   = obstack_finish(&bss);
 782         if (size > 0) {
 783                 be_gas_emit_switch_section(emit, GAS_SECTION_COMMON);
 784                 be_emit_string_len(emit, cp, size);
 785                 be_emit_write_line(emit);
 786         }
 787
 788         size = obstack_object_size(&ctor);
 789         cp   = obstack_finish(&ctor);
 790         if (size > 0) {
 791                 be_gas_emit_switch_section(emit, GAS_SECTION_CTOR);
 792                 be_emit_string_len(emit, cp, size);
 793                 be_emit_write_line(emit);
 794         }
 795
 796         obstack_free(&rodata, NULL);
 797         obstack_free(&data, NULL);
 798         obstack_free(&bss, NULL);
 799         obstack_free(&ctor, NULL);
 800
 801         /* dump the Thread Local Storage */
 802         obstack_init(&data);
 803
 804         env.rodata_obst = &data;
 805         env.data_obst   = &data;
 806         env.bss_obst    = &data;
 807         env.ctor_obst   = NULL;
 808
 809         be_gas_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
 810
 811         size = obstack_object_size(&data);
 812         cp   = obstack_finish(&data);
 813         if (size > 0) {
 814                 be_gas_emit_switch_section(emit, GAS_SECTION_TLS);
 815                 be_emit_cstring(emit, ".balign\t32\n");
 816                 be_emit_write_line(emit);
 817                 be_emit_string_len(emit, cp, size);
 818                 be_emit_write_line(emit);
 819         }
 820
 821         obstack_free(&data, NULL);
 822 }