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                         ".section\t.text",
  82                                 ".section\t.data",
  83                                 ".section\t.rodata",
  84                                 ".section\t.bss",
  85                                 ".section\t.tbss,\"awT\",@nobits",
  86                                 ".section\t.ctors,\"aw\",@progbits"
  87                 }
  88         };
  89
  90         assert((int) be_gas_flavour >= 0 && be_gas_flavour < GAS_FLAVOUR_MAX);
  91         assert((int) section >= 0 && section < GAS_SECTION_MAX);
  92         return text[be_gas_flavour][section];
  93 }
  94
  95 /**
  96  * Emit necessary code to switch to a section.
  97  *
  98  * @param env      the emitter environment
  99  * @param section  the section to switch to
 100  */
 101 void be_gas_emit_switch_section(be_gas_section_t section) {
 102         be_emit_char('\t');
 103         be_emit_string(get_section_name(section));
 104         be_emit_char('\n');
 105         be_emit_write_line();
 106 }
 107
 108 /**
 109  * An environment containing all needed dumper data.
 110  * Currently we create the file completely in memory first, then
 111  * write it to the disk. This is an artifact from the old C-generating backend
 112  * and even there NOT needed. So we might change it in the future.
 113  */
 114 typedef struct _be_gas_decl_env {
 115         obstack_t *rodata_obst;        /**< An obstack that will be filled with all rodata entities. */
 116         obstack_t *data_obst;          /**< An obstack that will be filled with the initialized entities. */
 117         obstack_t *bss_obst;           /**< An obstack that will be filled with the uninitialized entities. */
 118         obstack_t *ctor_obst;          /**< An obstack that will be filled with the constructor entities. */
 119         const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
 120         waitq     *worklist;           /**< A worklist we use to place not yet handled entities on. */
 121 } be_gas_decl_env_t;
 122
 123 /************************************************************************/
 124
 125 /**
 126  * Output a tarval.
 127  *
 128  * @param obst   the obstack where the data is written too
 129  * @param tv     the tarval
 130  * @param bytes  the width of the tarvals value in bytes
 131  */
 132 static void dump_arith_tarval(obstack_t *obst, tarval *tv, int bytes)
 133 {
 134         switch (bytes) {
 135
 136         case 1:
 137                 obstack_printf(obst, "0x%02x", get_tarval_sub_bits(tv, 0));
 138                 break;
 139
 140         case 2:
 141                 obstack_printf(obst, "0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 142                 break;
 143
 144         case 4:
 145                 obstack_printf(obst, "0x%02x%02x%02x%02x",
 146                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 147                 break;
 148
 149         case 8:
 150                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x",
 151                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 152                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 153                 break;
 154
 155         case 10:
 156         case 12:
 157                 break;
 158
 159         case 16:
 160                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x"
 161                                                "%02x%02x%02x%02x%02x%02x%02x%02x",
 162                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 163                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 164                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 165                         get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
 166                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
 167                         get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 168                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
 169                         get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 170                 break;
 171
 172
 173         default:
 174                 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
 175                 assert(0);
 176         }
 177 }
 178
 179 /**
 180  * Return the label prefix for labeled blocks.
 181  */
 182 const char *be_gas_label_prefix(void) {
 183         return ".LG";
 184 }
 185
 186 /**
 187  * Dump a label.
 188  */
 189 static void dump_label(obstack_t *obst, ir_label_t label) {
 190         obstack_printf(obst, "%s%ld", be_gas_label_prefix(), label);
 191 }
 192
 193 /**
 194  * Return the tarval of an atomic initializer.
 195  *
 196  * @param init  a node representing the initializer (on the const code irg)
 197  *
 198  * @return the tarval
 199  */
 200 static tarval *get_atomic_init_tv(ir_node *init)
 201 {
 202         for (;;) {
 203                 ir_mode *mode = get_irn_mode(init);
 204
 205                 switch (get_irn_opcode(init)) {
 206
 207                 case iro_Cast:
 208                         init = get_Cast_op(init);
 209                         continue;
 210
 211                 case iro_Conv:
 212                         init = get_Conv_op(init);
 213                         continue;
 214
 215                 case iro_Const:
 216                         return get_Const_tarval(init);
 217
 218                 case iro_SymConst:
 219                         switch (get_SymConst_kind(init)) {
 220                         case symconst_type_size:
 221                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 222
 223                         case symconst_type_align:
 224                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 225
 226                         case symconst_ofs_ent:
 227                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 228
 229                         case symconst_enum_const:
 230                                 return get_enumeration_value(get_SymConst_enum(init));
 231
 232                         case symconst_label:
 233                                 return NULL;
 234
 235                         default:
 236                                 return NULL;
 237                         }
 238
 239                 default:
 240                         return NULL;
 241                 }
 242         }
 243 }
 244
 245 /**
 246  * Dump an atomic value.
 247  *
 248  * @param env   the gas output environment
 249  * @param obst  an obstack the output is written to
 250  * @param init  a node representing the atomic value (on the const code irg)
 251  */
 252 static void do_dump_atomic_init(be_gas_decl_env_t *env, obstack_t *obst,
 253                                 ir_node *init)
 254 {
 255         ir_mode *mode = get_irn_mode(init);
 256         int bytes     = get_mode_size_bytes(mode);
 257         tarval *tv;
 258         ir_label_t label;
 259         ir_entity *ent;
 260
 261         switch (get_irn_opcode(init)) {
 262
 263         case iro_Cast:
 264                 do_dump_atomic_init(env, obst, get_Cast_op(init));
 265                 return;
 266
 267         case iro_Conv:
 268                 do_dump_atomic_init(env, obst, get_Conv_op(init));
 269                 return;
 270
 271         case iro_Const:
 272                 tv = get_Const_tarval(init);
 273
 274                 /* it's a arithmetic value */
 275                 dump_arith_tarval(obst, tv, bytes);
 276                 return;
 277
 278         case iro_SymConst:
 279                 switch (get_SymConst_kind(init)) {
 280                 case symconst_addr_name:
 281                         obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
 282                         break;
 283
 284                 case symconst_addr_ent:
 285                         ent = get_SymConst_entity(init);
 286                         if(!is_entity_backend_marked(ent)) {
 287                                 waitq_put(env->worklist, ent);
 288                                 set_entity_backend_marked(ent, 1);
 289                         }
 290                         obstack_printf(obst, "%s", get_entity_ld_name(ent));
 291                         break;
 292
 293                 case symconst_ofs_ent:
 294                         ent = get_SymConst_entity(init);
 295 #if 0       /* not needed, is it? */
 296                         if(!is_entity_backend_marked(ent)) {
 297                                 waitq_put(env->worklist, ent);
 298                                 set_entity_backend_marked(ent, 1);
 299                         }
 300 #endif
 301                         obstack_printf(obst, "%d", get_entity_offset(ent));
 302                         break;
 303
 304                 case symconst_type_size:
 305                         obstack_printf(obst, "%u", get_type_size_bytes(get_SymConst_type(init)));
 306                         break;
 307
 308                 case symconst_type_align:
 309                         obstack_printf(obst, "%u", get_type_alignment_bytes(get_SymConst_type(init)));
 310                         break;
 311
 312                 case symconst_enum_const:
 313                         tv = get_enumeration_value(get_SymConst_enum(init));
 314                         dump_arith_tarval(obst, tv, bytes);
 315                         break;
 316
 317                 case symconst_label:
 318                         label = get_SymConst_label(init);
 319                         dump_label(obst, label);
 320                         break;
 321
 322                 default:
 323                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 324                 }
 325                 return;
 326
 327                 case iro_Add:
 328                         do_dump_atomic_init(env, obst, get_Add_left(init));
 329                         obstack_printf(obst, " + ");
 330                         do_dump_atomic_init(env, obst, get_Add_right(init));
 331                         return;
 332
 333                 case iro_Sub:
 334                         do_dump_atomic_init(env, obst, get_Sub_left(init));
 335                         obstack_printf(obst, " - ");
 336                         do_dump_atomic_init(env, obst, get_Sub_right(init));
 337                         return;
 338
 339                 case iro_Mul:
 340                         do_dump_atomic_init(env, obst, get_Mul_left(init));
 341                         obstack_printf(obst, " * ");
 342                         do_dump_atomic_init(env, obst, get_Mul_right(init));
 343                         return;
 344
 345                 default:
 346                         assert(0 && "dump_atomic_init(): unknown IR-node");
 347         }
 348 }
 349
 350 /**
 351  * Dumps the type for given size (.byte, .long, ...)
 352  *
 353  * @param obst  an obstack the output is written to
 354  * @param size  the size in bytes
 355  */
 356 static void dump_size_type(obstack_t *obst, int size) {
 357         switch (size) {
 358
 359         case 1:
 360                 obstack_printf(obst, "\t.byte\t");
 361                 break;
 362
 363         case 2:
 364                 obstack_printf(obst, "\t.value\t");
 365                 break;
 366
 367         case 4:
 368                 obstack_printf(obst, "\t.long\t");
 369                 break;
 370
 371         case 8:
 372                 obstack_printf(obst, "\t.quad\t");
 373                 break;
 374
 375         case 10:
 376         case 12:
 377                 /* handled in arith */
 378                 break;
 379
 380         case 16:
 381                 obstack_printf(obst, "\t.octa\t");
 382                 break;
 383
 384         default:
 385                 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
 386                 assert(0);
 387         }
 388 }
 389
 390 /**
 391  * Dump an atomic value to an obstack.
 392  *
 393  * @param env   the gas output environment
 394  * @param obst  an obstack the output is written to
 395  * @param init  a node representing the atomic value (on the const code irg)
 396  */
 397 static void dump_atomic_init(be_gas_decl_env_t *env, obstack_t *obst,
 398                              ir_node *init)
 399 {
 400         ir_mode *mode = get_irn_mode(init);
 401         int bytes     = get_mode_size_bytes(mode);
 402
 403         dump_size_type(obst, bytes);
 404         do_dump_atomic_init(env, obst, init);
 405         obstack_printf(obst, "\n");
 406 }
 407
 408 /************************************************************************/
 409 /* Routines to dump global variables                                    */
 410 /************************************************************************/
 411
 412 /**
 413  * Determine if an entity is a string constant
 414  * @param ent The entity
 415  * @return 1 if it is a string constant, 0 otherwise
 416  */
 417 static int ent_is_string_const(ir_entity *ent)
 418 {
 419         ir_type *type, *element_type;
 420         ir_mode *mode;
 421         int i, c, n;
 422
 423         type = get_entity_type(ent);
 424
 425         /* if it's an array */
 426         if (!is_Array_type(type))
 427                 return 0;
 428
 429         element_type = get_array_element_type(type);
 430
 431         /* and the array's element type is primitive */
 432         if (!is_Primitive_type(element_type))
 433                 return 0;
 434
 435         /* and the mode of the element type is an int of
 436          * the same size as the byte mode */
 437         mode = get_type_mode(element_type);
 438         if (!mode_is_int(mode)
 439                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 440                 return 0;
 441
 442         /* if it contains only printable chars and a 0 at the end */
 443         n = get_compound_ent_n_values(ent);
 444         for (i = 0; i < n; ++i) {
 445                 ir_node *irn = get_compound_ent_value(ent, i);
 446                 if (! is_Const(irn))
 447                         return 0;
 448
 449                 c = (int) get_tarval_long(get_Const_tarval(irn));
 450
 451                 if((i < n - 1 && !(isgraph(c) || isspace(c)))
 452                                 || (i == n - 1 && c != '\0'))
 453                         return 0;
 454         }
 455
 456         /* then we can emit it as a string constant */
 457         return 1;
 458 }
 459
 460 /**
 461  * Dump a string constant.
 462  * No checks are made!!
 463  *
 464  * @param obst The obst to dump on.
 465  * @param ent  The entity to dump.
 466  */
 467 static void dump_string_cst(obstack_t *obst, ir_entity *ent)
 468 {
 469         int      i, n;
 470         ir_type *type;
 471         int      type_size;
 472         int      remaining_space;
 473
 474         obstack_printf(obst, "\t.string \"");
 475         n = get_compound_ent_n_values(ent);
 476
 477         for (i = 0; i < n-1; ++i) {
 478                 ir_node *irn;
 479                 int c;
 480
 481                 irn = get_compound_ent_value(ent, i);
 482                 c = (int) get_tarval_long(get_Const_tarval(irn));
 483
 484                 switch (c) {
 485                 case '"' : obstack_printf(obst, "\\\""); break;
 486                 case '\n': obstack_printf(obst, "\\n"); break;
 487                 case '\r': obstack_printf(obst, "\\r"); break;
 488                 case '\t': obstack_printf(obst, "\\t"); break;
 489                 case '\\': obstack_printf(obst, "\\\\"); break;
 490                 default  :
 491                         if (isprint(c))
 492                                 obstack_printf(obst, "%c", c);
 493                         else
 494                                 obstack_printf(obst, "\\%o", c);
 495                         break;
 496                 }
 497         }
 498         obstack_printf(obst, "\"\n");
 499
 500         type            = get_entity_type(ent);
 501         type_size       = get_type_size_bytes(type);
 502         remaining_space = type_size - n;
 503         assert(remaining_space >= 0);
 504         if(remaining_space > 0) {
 505                 obstack_printf(obst, "\t.skip\t%d\n", remaining_space);
 506         }
 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         unsigned k, 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                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
 538                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
 539                 ir_node  *value         = get_compound_ent_value(ent, i);
 540                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
 541
 542                 offset += (value_len + bits_remainder + 7) >> 3;
 543
 544                 if (offset > last_ofs) {
 545                         last_ofs = offset;
 546                 }
 547         }
 548
 549         /*
 550          * In the worst case, every initializer allocates one byte.
 551          * Moreover, initializer might be big, do not allocate on stack.
 552          */
 553         vals = xcalloc(last_ofs, sizeof(vals[0]));
 554
 555         /* collect the values and store them at the offsets */
 556         for (i = 0; i < n; ++i) {
 557                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
 558                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
 559                 ir_node  *value      = get_compound_ent_value(ent, i);
 560                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
 561
 562                 assert(offset_bits >= 0);
 563
 564                 if (offset_bits != 0 ||
 565                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
 566                         tarval *tv = get_atomic_init_tv(value);
 567                         unsigned char curr_bits, last_bits = 0;
 568                         if (tv == NULL) {
 569                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
 570                                       get_entity_ld_name(ent));
 571                         }
 572                         /* normalize offset */
 573                         offset += offset_bits >> 3;
 574                         offset_bits &= 7;
 575
 576                         for (j = 0; value_len + offset_bits > 0; ++j) {
 577                                 assert(offset + j < last_ofs);
 578                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
 579                                 vals[offset + j].kind = BITFIELD;
 580                                 curr_bits = get_tarval_sub_bits(tv, j);
 581                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 582                                 value_len -= 8;
 583                                 last_bits = curr_bits;
 584                         }
 585                 } else {
 586                         int i;
 587
 588                         assert(offset < last_ofs);
 589                         assert(vals[offset].kind == NORMAL);
 590                         for (i = 1; i < value_len / 8; ++i) {
 591                                 assert(vals[offset + i].v.value == NULL);
 592                         }
 593                         vals[offset].v.value = value;
 594                 }
 595         }
 596
 597         /* now write them sorted */
 598         for (k = 0; k < last_ofs; ) {
 599                 int space = 0, skip = 0;
 600                 if (vals[k].kind == NORMAL) {
 601                         if(vals[k].v.value != NULL) {
 602                                 dump_atomic_init(env, obst, vals[k].v.value);
 603                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
 604                         } else {
 605                                 space = 1;
 606                         }
 607                 } else {
 608                         assert(vals[k].kind == BITFIELD);
 609                         obstack_printf(obst, "\t.byte\t%d\n", vals[k].v.bf_val);
 610                 }
 611
 612                 ++k;
 613                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 614                         ++space;
 615                         ++k;
 616                 }
 617                 space -= skip;
 618                 assert(space >= 0);
 619
 620                 /* a gap */
 621                 if (space > 0)
 622                         obstack_printf(obst, "\t.skip\t%d\n", space);
 623         }
 624         xfree(vals);
 625 }
 626
 627 /**
 628  * Dump a global entity.
 629  *
 630  * @param env           the gas output environment
 631  * @param ent           the entity to be dumped
 632  * @param emit_commons  if non-zero, emit commons (non-local uninitialized entities)
 633  */
 634 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent, int emit_commons)
 635 {
 636         obstack_t *obst;
 637         ir_type *type = get_entity_type(ent);
 638         const char *ld_name = get_entity_ld_name(ent);
 639         unsigned align = get_type_alignment_bytes(type);
 640         int emit_as_common = 0;
 641         ir_variability variability;
 642         ir_visibility visibility;
 643
 644         obst = env->data_obst;
 645         if (is_Method_type(type)) {
 646                 if (get_method_img_section(ent) == section_constructors) {
 647                         obst = env->ctor_obst;
 648                         obstack_printf(obst, ".balign\t%u\n", align);
 649                         dump_size_type(obst, align);
 650                         obstack_printf(obst, "%s\n", ld_name);
 651                 }
 652                 return;
 653         }
 654
 655         variability = get_entity_variability(ent);
 656         visibility = get_entity_visibility(ent);
 657         if (variability == variability_constant) {
 658                 /* a constant entity, put it on the rdata */
 659                 obst = env->rodata_obst;
 660         } else if (variability == variability_uninitialized) {
 661                 /* uninitialized entity put it in bss segment */
 662                 obst = env->bss_obst;
 663                 if (emit_commons && visibility != visibility_local)
 664                         emit_as_common = 1;
 665         }
 666
 667         be_dbg_variable(env->main_env->db_handle, obst, ent);
 668
 669         /* global or not global */
 670         if (visibility == visibility_external_visible && !emit_as_common) {
 671                 obstack_printf(obst, ".global\t%s\n", ld_name);
 672         } else if(visibility == visibility_external_allocated) {
 673                 obstack_printf(obst, ".global\t%s\n", ld_name);
 674                 /* we can return now... */
 675                 return;
 676         }
 677         /* alignment */
 678         if (align > 1 && !emit_as_common) {
 679                 obstack_printf(obst, ".balign\t%u\n", align);
 680         }
 681
 682         if (!emit_as_common) {
 683                 obstack_printf(obst, "%s:\n", ld_name);
 684         }
 685
 686         if (variability == variability_uninitialized) {
 687                 if (emit_as_common) {
 688                         switch (be_gas_flavour) {
 689                         case GAS_FLAVOUR_NORMAL:
 690                         case GAS_FLAVOUR_YASM:
 691                                 obstack_printf(obst, "\t.comm %s,%u,%u\n",
 692                                         ld_name, get_type_size_bytes(type), align);
 693                                 break;
 694                         case GAS_FLAVOUR_MINGW:
 695                                 obstack_printf(obst, "\t.comm %s,%u # %u\n",
 696                                         ld_name, get_type_size_bytes(type), align);
 697                                 break;
 698                         }
 699                 } else {
 700                         obstack_printf(obst, "\t.zero %u\n", get_type_size_bytes(type));
 701                 }
 702         } else {
 703                 if (is_atomic_entity(ent)) {
 704                         dump_atomic_init(env, obst, get_atomic_ent_value(ent));
 705                 } else {
 706                         /* sort_compound_ent_values(ent); */
 707
 708                         switch (get_type_tpop_code(get_entity_type(ent))) {
 709                         case tpo_array:
 710                                 if (ent_is_string_const(ent))
 711                                         dump_string_cst(obst, ent);
 712                                 else
 713                                         dump_compound_init(env, obst, ent);
 714                                 break;
 715                         case tpo_struct:
 716                         case tpo_class:
 717                         case tpo_union:
 718                                 dump_compound_init(env, obst, ent);
 719                                 break;
 720                         default:
 721                                 assert(0);
 722                         }
 723                 }
 724         }
 725 }
 726
 727 /**
 728  * Dumps declarations of global variables and the initialization code.
 729  *
 730  * @param gt                a global like type, either the global or the TLS one
 731  * @param env               an environment
 732  * @param emit_commons      if non-zero, emit commons (non-local uninitialized entities)
 733  * @param only_emit_marked  if non-zero, external allocated entities that do not have
 734  *                          its visited flag set are ignored
 735  */
 736 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
 737                               int emit_commons, int only_emit_marked)
 738 {
 739         int i, n = get_compound_n_members(gt);
 740         waitq *worklist = new_waitq();
 741
 742         if (only_emit_marked) {
 743                 for (i = 0; i < n; i++) {
 744                         ir_entity *ent = get_compound_member(gt, i);
 745                         if (is_entity_backend_marked(ent) ||
 746                             get_entity_visibility(ent) != visibility_external_allocated) {
 747                                 waitq_put(worklist, ent);
 748                                 set_entity_backend_marked(ent, 1);
 749                         }
 750                 }
 751         } else {
 752                 for (i = 0; i < n; i++) {
 753                         ir_entity *ent = get_compound_member(gt, i);
 754                         set_entity_backend_marked(ent, 1);
 755                         waitq_put(worklist, ent);
 756                 }
 757         }
 758
 759         env->worklist = worklist;
 760
 761         while (!waitq_empty(worklist)) {
 762                 ir_entity *ent = waitq_get(worklist);
 763
 764                 dump_global(env, ent, emit_commons);
 765         }
 766
 767         del_waitq(worklist);
 768         env->worklist = NULL;
 769 }
 770
 771 /************************************************************************/
 772
 773 /* Generate all entities. */
 774 void be_gas_emit_decls(const be_main_env_t *main_env,
 775                        int only_emit_marked_entities)
 776 {
 777         be_gas_decl_env_t env;
 778         obstack_t         rodata;
 779         obstack_t         data;
 780         obstack_t         bss;
 781         obstack_t         ctor;
 782         int               size;
 783         char              *cp;
 784
 785         /* dump the global type */
 786         obstack_init(&rodata);
 787         obstack_init(&data);
 788         obstack_init(&bss);
 789         obstack_init(&ctor);
 790
 791         env.rodata_obst = &rodata;
 792         env.data_obst   = &data;
 793         env.bss_obst    = &bss;
 794         env.ctor_obst   = &ctor;
 795         env.main_env    = main_env;
 796
 797         be_gas_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
 798
 799         size = obstack_object_size(&data);
 800         cp   = obstack_finish(&data);
 801         if (size > 0) {
 802                 be_gas_emit_switch_section(GAS_SECTION_DATA);
 803                 be_emit_string_len(cp, size);
 804                 be_emit_write_line();
 805         }
 806
 807         size = obstack_object_size(&rodata);
 808         cp   = obstack_finish(&rodata);
 809         if (size > 0) {
 810                 be_gas_emit_switch_section(GAS_SECTION_RODATA);
 811                 be_emit_string_len(cp, size);
 812                 be_emit_write_line();
 813         }
 814
 815         size = obstack_object_size(&bss);
 816         cp   = obstack_finish(&bss);
 817         if (size > 0) {
 818                 be_gas_emit_switch_section(GAS_SECTION_COMMON);
 819                 be_emit_string_len(cp, size);
 820                 be_emit_write_line();
 821         }
 822
 823         size = obstack_object_size(&ctor);
 824         cp   = obstack_finish(&ctor);
 825         if (size > 0) {
 826                 be_gas_emit_switch_section(GAS_SECTION_CTOR);
 827                 be_emit_string_len(cp, size);
 828                 be_emit_write_line();
 829         }
 830
 831         obstack_free(&rodata, NULL);
 832         obstack_free(&data, NULL);
 833         obstack_free(&bss, NULL);
 834         obstack_free(&ctor, NULL);
 835
 836         /* dump the Thread Local Storage */
 837         obstack_init(&data);
 838
 839         env.rodata_obst = &data;
 840         env.data_obst   = &data;
 841         env.bss_obst    = &data;
 842         env.ctor_obst   = NULL;
 843
 844         be_gas_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
 845
 846         size = obstack_object_size(&data);
 847         cp   = obstack_finish(&data);
 848         if (size > 0) {
 849                 be_gas_emit_switch_section(GAS_SECTION_TLS);
 850                 be_emit_cstring(".balign\t32\n");
 851                 be_emit_write_line();
 852                 be_emit_string_len(cp, size);
 853                 be_emit_write_line();
 854         }
 855
 856         obstack_free(&data, NULL);
 857 }