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(!entity_visited(ent)) {
 261                                 waitq_put(env->worklist, ent);
 262                                 mark_entity_visited(ent);
 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(!entity_visited(ent)) {
 271                                 waitq_put(env->worklist, ent);
 272                                 mark_entity_visited(ent);
 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 static void dump_array_init(be_gas_decl_env_t *env, obstack_t *obst,
 479                             ir_entity *ent)
 480 {
 481         const ir_type *ty = get_entity_type(ent);
 482         int i;
 483         int filler;
 484         int size = 0;
 485
 486         /* potential spare values should be already included! */
 487         for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
 488                 ir_entity *step = get_compound_ent_value_member(ent, i);
 489                 ir_type *stype = get_entity_type(step);
 490
 491                 if (get_type_mode(stype)) {
 492                         int align = (get_type_alignment_bits(stype) + 7) >> 3;
 493                         int n     = size % align;
 494
 495                         if (n > 0) {
 496                                 obstack_printf(obst, "\t.zero\t%d\n", align - n);
 497                                 size += align - n;
 498                         }
 499                 }
 500                 dump_atomic_init(env, obst, get_compound_ent_value(ent, i));
 501                 size += get_type_size_bytes(stype);
 502         }
 503         filler = get_type_size_bytes(ty) - size;
 504
 505         if (filler > 0)
 506                 obstack_printf(obst, "\t.skip\t%d\n", filler);
 507 }
 508
 509 enum normal_or_bitfield_kind {
 510         NORMAL = 0,
 511         BITFIELD
 512 };
 513
 514 typedef struct {
 515         enum normal_or_bitfield_kind kind;
 516         union {
 517                 ir_node *value;
 518                 unsigned char bf_val;
 519         } v;
 520 } normal_or_bitfield;
 521
 522 /**
 523  * Dump an initializer for a compound entity.
 524  */
 525 static void dump_compound_init(be_gas_decl_env_t *env, obstack_t *obst,
 526                                ir_entity *ent)
 527 {
 528         normal_or_bitfield *vals;
 529         int i, j, n = get_compound_ent_n_values(ent);
 530         int last_ofs;
 531
 532         /* Find the initializer size. Sorrily gcc support a nasty feature:
 533            The last field of a compound may be a flexible array. This allows
 534            initializers bigger than the type size. */
 535         last_ofs = get_type_size_bytes(get_entity_type(ent));
 536         for (i = 0; i < n; ++i) {
 537                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 538                 int bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
 539                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 540                 int path_len = get_compound_graph_path_length(path);
 541                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 542                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 543
 544                 offset += (value_len + bits_remainder + 7) >> 3;
 545
 546                 if (offset > last_ofs) {
 547                         last_ofs = offset;
 548                 }
 549         }
 550
 551         /*
 552          * In the worst case, every initializer allocates one byte.
 553          * Moreover, initializer might be big, do not allocate on stack.
 554          */
 555         vals = xcalloc(last_ofs, sizeof(vals[0]));
 556
 557         /* collect the values and store them at the offsets */
 558         for (i = 0; i < n; ++i) {
 559                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 560                 int path_len = get_compound_graph_path_length(path);
 561                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 562                 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
 563                 ir_node *value = get_compound_ent_value(ent, i);
 564                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 565                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 566                 assert(offset >= 0);
 567                 assert(offset_bits >= 0);
 568
 569                 if (offset_bits != 0 ||
 570                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
 571                         tarval *shift, *shifted;
 572                         tarval *tv = get_atomic_init_tv(value);
 573                         if (tv == NULL) {
 574                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
 575                                       get_entity_ld_name(ent));
 576                         }
 577                         tv = tarval_convert_to(tv, mode_Lu);
 578                         shift = new_tarval_from_long(offset_bits, mode_Is);
 579                         shifted = tarval_shl(tv, shift);
 580                         if (shifted == tarval_bad || shifted == tarval_undefined) {
 581                                 panic("Couldn't shift numeric value for bitfield initializer '%s'\n",
 582                                       get_entity_ld_name(ent));
 583                         }
 584
 585                         for (j = 0; value_len > 0; ++j) {
 586                                 assert(offset + j < last_ofs);
 587                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
 588                                 vals[offset + j].kind = BITFIELD;
 589                                 vals[offset + j].v.bf_val |= get_tarval_sub_bits(shifted, j);
 590                                 value_len -= 8 - offset_bits;
 591                                 offset_bits = 0;
 592                         }
 593                 } else {
 594                         assert(offset < last_ofs);
 595                         assert(vals[offset].kind == NORMAL);
 596                         assert(vals[offset].v.value == NULL);
 597                         vals[offset].v.value = value;
 598                 }
 599         }
 600
 601         /* now write them sorted */
 602         for (i = 0; i < last_ofs; ) {
 603                 int space = 0, skip = 0;
 604                 if (vals[i].kind == NORMAL) {
 605                         if(vals[i].v.value != NULL) {
 606                                 dump_atomic_init(env, obst, vals[i].v.value);
 607                                 skip = get_mode_size_bytes(get_irn_mode(vals[i].v.value)) - 1;
 608                         } else {
 609                                 space = 1;
 610                         }
 611                 } else {
 612                         assert(vals[i].kind == BITFIELD);
 613                         obstack_printf(obst, "\t.byte\t%d\n", vals[i].v.bf_val);
 614                 }
 615
 616                 ++i;
 617                 space = 0;
 618                 while (i < last_ofs && vals[i].kind == NORMAL && vals[i].v.value == NULL) {
 619                         ++space;
 620                         ++i;
 621                 }
 622                 space -= skip;
 623                 assert(space >= 0);
 624
 625                 /* a gap */
 626                 if (space > 0)
 627                         obstack_printf(obst, "\t.skip\t%d\n", space);
 628         }
 629         xfree(vals);
 630 }
 631
 632 /**
 633  * Dump a global entity.
 634  *
 635  * @param env           the gas output environment
 636  * @param ent           the entity to be dumped
 637  * @param emit_commons  if non-zero, emit commons (non-local uninitialized entities)
 638  */
 639 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent, int emit_commons)
 640 {
 641         obstack_t *obst;
 642         ir_type *type = get_entity_type(ent);
 643         const char *ld_name = get_entity_ld_name(ent);
 644         ir_variability variability = get_entity_variability(ent);
 645         ir_visibility visibility = get_entity_visibility(ent);
 646         int align = get_type_alignment_bytes(type);
 647         int emit_as_common = 0;
 648
 649         obst = env->data_obst;
 650         if (is_Method_type(type)) {
 651                 if (get_method_img_section(ent) == section_constructors) {
 652                         obst = env->ctor_obst;
 653                         obstack_printf(obst, ".balign\t%d\n", align);
 654                         dump_size_type(obst, align);
 655                         obstack_printf(obst, "%s\n", ld_name);
 656                 }
 657                 return;
 658         } else if (variability == variability_constant) {
 659                 /* a constant entity, put it on the rdata */
 660                 obst = env->rodata_obst;
 661         } else if (variability == variability_uninitialized) {
 662                 /* uninitialized entity put it in bss segment */
 663                 obst = env->bss_obst;
 664                 if(emit_commons && visibility != visibility_local)
 665                         emit_as_common = 1;
 666         }
 667
 668         be_dbg_variable(env->main_env->db_handle, obst, ent);
 669
 670         /* global or not global */
 671         if (visibility == visibility_external_visible && !emit_as_common) {
 672                 obstack_printf(obst, ".global\t%s\n", ld_name);
 673         } else if(visibility == visibility_external_allocated) {
 674                 obstack_printf(obst, ".global\t%s\n", ld_name);
 675                 /* we can return now... */
 676                 return;
 677         }
 678         /* alignment */
 679         if (align > 1 && !emit_as_common) {
 680                 obstack_printf(obst, ".balign\t%d\n", align);
 681         }
 682
 683         if (!emit_as_common) {
 684                 obstack_printf(obst, "%s:\n", ld_name);
 685         }
 686
 687         if (variability == variability_uninitialized) {
 688                 if(emit_as_common) {
 689                         if (be_gas_flavour == GAS_FLAVOUR_NORMAL)
 690                                 obstack_printf(obst, "\t.comm %s,%d,%d\n",
 691                                         ld_name, get_type_size_bytes(type), align);
 692                         else
 693                                 obstack_printf(obst, "\t.comm %s,%d # %d\n",
 694                                         ld_name, get_type_size_bytes(type), align);
 695                 } else {
 696                         obstack_printf(obst, "\t.zero %d\n", get_type_size_bytes(type));
 697                 }
 698         } else if (is_atomic_type(type)) {
 699                 dump_atomic_init(env, obst, get_atomic_ent_value(ent));
 700         } else if (ent_is_string_const(ent)) {
 701                 dump_string_cst(obst, ent);
 702         } else if (is_Array_type(type)) {
 703                 dump_array_init(env, obst, ent);
 704         } else if (is_compound_type(type)) {
 705                 dump_compound_init(env, obst, ent);
 706         } else {
 707                 assert(0 && "unsupported type");
 708         }
 709 }
 710
 711 /**
 712  * Dumps declarations of global variables and the initialization code.
 713  *
 714  * @param gt                a global like type, either the global or the TLS one
 715  * @param env               an environment
 716  * @param emit_commons      if non-zero, emit commons (non-local uninitialized entities)
 717  * @param only_emit_marked  if non-zero, external allocated entities that do not have
 718  *                          its visited flag set are ignored
 719  */
 720 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
 721                               int emit_commons, int only_emit_marked)
 722 {
 723         int i, n = get_compound_n_members(gt);
 724         waitq *worklist = new_waitq();
 725
 726         if(only_emit_marked) {
 727                 for (i = 0; i < n; i++) {
 728                         ir_entity *ent = get_compound_member(gt, i);
 729                         if(entity_visited(ent) ||
 730                                         get_entity_visibility(ent) != visibility_external_allocated) {
 731                                 waitq_put(worklist, ent);
 732                                 mark_entity_visited(ent);
 733                         }
 734                 }
 735         } else {
 736                 inc_master_type_visited();
 737                 for (i = 0; i < n; i++) {
 738                         ir_entity *ent = get_compound_member(gt, i);
 739                         mark_entity_visited(ent);
 740                         waitq_put(worklist, ent);
 741                 }
 742         }
 743
 744         env->worklist = worklist;
 745
 746         while(!waitq_empty(worklist)) {
 747                 ir_entity *ent = waitq_get(worklist);
 748
 749                 dump_global(env, ent, emit_commons);
 750         }
 751
 752         del_waitq(worklist);
 753         env->worklist = NULL;
 754 }
 755
 756 /************************************************************************/
 757
 758 /* Generate all entities. */
 759 void be_gas_emit_decls(be_emit_env_t *emit, const be_main_env_t *main_env,
 760                        int only_emit_marked_entities)
 761 {
 762         be_gas_decl_env_t env;
 763         obstack_t rodata, data, bss, ctor;
 764         int    size;
 765         char   *cp;
 766
 767         /* dump the global type */
 768         obstack_init(&rodata);
 769         obstack_init(&data);
 770         obstack_init(&bss);
 771         obstack_init(&ctor);
 772
 773         env.rodata_obst = &rodata;
 774         env.data_obst   = &data;
 775         env.bss_obst    = &bss;
 776         env.ctor_obst   = &ctor;
 777         env.main_env    = main_env;
 778
 779         be_gas_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
 780
 781         size = obstack_object_size(&data);
 782         cp   = obstack_finish(&data);
 783         if (size > 0) {
 784                 be_gas_emit_switch_section(emit, GAS_SECTION_DATA);
 785                 be_emit_string_len(emit, cp, size);
 786                 be_emit_write_line(emit);
 787         }
 788
 789         size = obstack_object_size(&rodata);
 790         cp   = obstack_finish(&rodata);
 791         if (size > 0) {
 792                 be_gas_emit_switch_section(emit, GAS_SECTION_RODATA);
 793                 be_emit_string_len(emit, cp, size);
 794                 be_emit_write_line(emit);
 795         }
 796
 797         size = obstack_object_size(&bss);
 798         cp   = obstack_finish(&bss);
 799         if (size > 0) {
 800                 be_gas_emit_switch_section(emit, GAS_SECTION_COMMON);
 801                 be_emit_string_len(emit, cp, size);
 802                 be_emit_write_line(emit);
 803         }
 804
 805         size = obstack_object_size(&ctor);
 806         cp   = obstack_finish(&ctor);
 807         if (size > 0) {
 808                 be_gas_emit_switch_section(emit, GAS_SECTION_CTOR);
 809                 be_emit_string_len(emit, cp, size);
 810                 be_emit_write_line(emit);
 811         }
 812
 813         obstack_free(&rodata, NULL);
 814         obstack_free(&data, NULL);
 815         obstack_free(&bss, NULL);
 816         obstack_free(&ctor, NULL);
 817
 818         /* dump the Thread Local Storage */
 819         obstack_init(&data);
 820
 821         env.rodata_obst = &data;
 822         env.data_obst   = &data;
 823         env.bss_obst    = &data;
 824         env.ctor_obst   = NULL;
 825
 826         be_gas_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
 827
 828         size = obstack_object_size(&data);
 829         cp   = obstack_finish(&data);
 830         if (size > 0) {
 831                 be_gas_emit_switch_section(emit, GAS_SECTION_TLS);
 832                 be_emit_cstring(emit, ".balign\t32\n");
 833                 be_emit_write_line(emit);
 834                 be_emit_string_len(emit, cp, size);
 835                 be_emit_write_line(emit);
 836         }
 837
 838         obstack_free(&data, NULL);
 839 }