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 const char *gnu_label_prefix(void) {
 172         return ".LG";
 173 }
 174
 175 /**
 176  * Dump a label.
 177  */
 178 static void dump_label(obstack_t *obst, ir_label_t label) {
 179         obstack_printf(obst, "%s%ld", gnu_label_prefix(), label);
 180 }
 181
 182 /**
 183  * Return the tarval of an atomic initializer.
 184  *
 185  * @param init  a node representing the initializer (on the const code irg)
 186  *
 187  * @return the tarval
 188  */
 189 static tarval *get_atomic_init_tv(ir_node *init)
 190 {
 191         for (;;) {
 192                 ir_mode *mode = get_irn_mode(init);
 193
 194                 switch (get_irn_opcode(init)) {
 195
 196                 case iro_Cast:
 197                         init = get_Cast_op(init);
 198                         continue;
 199
 200                 case iro_Conv:
 201                         init = get_Conv_op(init);
 202                         continue;
 203
 204                 case iro_Const:
 205                         return get_Const_tarval(init);
 206
 207                 case iro_SymConst:
 208                         switch (get_SymConst_kind(init)) {
 209                         case symconst_type_size:
 210                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 211
 212                         case symconst_type_align:
 213                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 214
 215                         case symconst_ofs_ent:
 216                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 217
 218                         case symconst_enum_const:
 219                                 return get_enumeration_value(get_SymConst_enum(init));
 220
 221                         case symconst_label:
 222                                 return NULL;
 223
 224                         default:
 225                                 return NULL;
 226                         }
 227
 228                 default:
 229                         return NULL;
 230                 }
 231         }
 232 }
 233
 234 /**
 235  * Dump an atomic value.
 236  *
 237  * @param env   the gas output environment
 238  * @param obst  an obstack the output is written to
 239  * @param init  a node representing the atomic value (on the const code irg)
 240  */
 241 static void do_dump_atomic_init(be_gas_decl_env_t *env, obstack_t *obst,
 242                                 ir_node *init)
 243 {
 244         ir_mode *mode = get_irn_mode(init);
 245         int bytes     = get_mode_size_bytes(mode);
 246         tarval *tv;
 247         ir_label_t label;
 248         ir_entity *ent;
 249
 250         switch (get_irn_opcode(init)) {
 251
 252         case iro_Cast:
 253                 do_dump_atomic_init(env, obst, get_Cast_op(init));
 254                 return;
 255
 256         case iro_Conv:
 257                 do_dump_atomic_init(env, obst, get_Conv_op(init));
 258                 return;
 259
 260         case iro_Const:
 261                 tv = get_Const_tarval(init);
 262
 263                 /* it's a arithmetic value */
 264                 dump_arith_tarval(obst, tv, bytes);
 265                 return;
 266
 267         case iro_SymConst:
 268                 switch (get_SymConst_kind(init)) {
 269                 case symconst_addr_name:
 270                         obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
 271                         break;
 272
 273                 case symconst_addr_ent:
 274                         ent = get_SymConst_entity(init);
 275                         if(!is_entity_backend_marked(ent)) {
 276                                 waitq_put(env->worklist, ent);
 277                                 set_entity_backend_marked(ent, 1);
 278                         }
 279                         obstack_printf(obst, "%s", get_entity_ld_name(ent));
 280                         break;
 281
 282                 case symconst_ofs_ent:
 283                         ent = get_SymConst_entity(init);
 284 #if 0       /* not needed, is it? */
 285                         if(!is_entity_backend_marked(ent)) {
 286                                 waitq_put(env->worklist, ent);
 287                                 set_entity_backend_marked(ent, 1);
 288                         }
 289 #endif
 290                         obstack_printf(obst, "%d", get_entity_offset(ent));
 291                         break;
 292
 293                 case symconst_type_size:
 294                         obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
 295                         break;
 296
 297                 case symconst_type_align:
 298                         obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
 299                         break;
 300
 301                 case symconst_enum_const:
 302                         tv = get_enumeration_value(get_SymConst_enum(init));
 303                         dump_arith_tarval(obst, tv, bytes);
 304                         break;
 305
 306                 case symconst_label:
 307                         label = get_SymConst_label(init);
 308                         dump_label(obst, label);
 309                         break;
 310
 311                 default:
 312                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 313                 }
 314                 return;
 315
 316                 case iro_Add:
 317                         do_dump_atomic_init(env, obst, get_Add_left(init));
 318                         obstack_printf(obst, " + ");
 319                         do_dump_atomic_init(env, obst, get_Add_right(init));
 320                         return;
 321
 322                 case iro_Sub:
 323                         do_dump_atomic_init(env, obst, get_Sub_left(init));
 324                         obstack_printf(obst, " - ");
 325                         do_dump_atomic_init(env, obst, get_Sub_right(init));
 326                         return;
 327
 328                 case iro_Mul:
 329                         do_dump_atomic_init(env, obst, get_Mul_left(init));
 330                         obstack_printf(obst, " * ");
 331                         do_dump_atomic_init(env, obst, get_Mul_right(init));
 332                         return;
 333
 334                 default:
 335                         assert(0 && "dump_atomic_init(): unknown IR-node");
 336         }
 337 }
 338
 339 /**
 340  * Dumps the type for given size (.byte, .long, ...)
 341  *
 342  * @param obst  an obstack the output is written to
 343  * @param size  the size in bytes
 344  */
 345 static void dump_size_type(obstack_t *obst, int size) {
 346         switch (size) {
 347
 348         case 1:
 349                 obstack_printf(obst, "\t.byte\t");
 350                 break;
 351
 352         case 2:
 353                 obstack_printf(obst, "\t.value\t");
 354                 break;
 355
 356         case 4:
 357                 obstack_printf(obst, "\t.long\t");
 358                 break;
 359
 360         case 8:
 361                 obstack_printf(obst, "\t.quad\t");
 362                 break;
 363
 364         case 10:
 365         case 12:
 366                 /* handled in arith */
 367                 break;
 368
 369         case 16:
 370                 obstack_printf(obst, "\t.octa\t");
 371                 break;
 372
 373         default:
 374                 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
 375                 assert(0);
 376         }
 377 }
 378
 379 /**
 380  * Dump an atomic value to an obstack.
 381  *
 382  * @param env   the gas output environment
 383  * @param obst  an obstack the output is written to
 384  * @param init  a node representing the atomic value (on the const code irg)
 385  */
 386 static void dump_atomic_init(be_gas_decl_env_t *env, obstack_t *obst,
 387                              ir_node *init)
 388 {
 389         ir_mode *mode = get_irn_mode(init);
 390         int bytes     = get_mode_size_bytes(mode);
 391
 392         dump_size_type(obst, bytes);
 393         do_dump_atomic_init(env, obst, init);
 394         obstack_printf(obst, "\n");
 395 }
 396
 397 /************************************************************************/
 398 /* Routines to dump global variables                                    */
 399 /************************************************************************/
 400
 401 /**
 402  * Determine if an entity is a string constant
 403  * @param ent The entity
 404  * @return 1 if it is a string constant, 0 otherwise
 405  */
 406 static int ent_is_string_const(ir_entity *ent)
 407 {
 408         ir_type *type, *element_type;
 409         ir_mode *mode;
 410         int i, c, n;
 411
 412         type = get_entity_type(ent);
 413
 414         /* if it's an array */
 415         if (!is_Array_type(type))
 416                 return 0;
 417
 418         element_type = get_array_element_type(type);
 419
 420         /* and the array's element type is primitive */
 421         if (!is_Primitive_type(element_type))
 422                 return 0;
 423
 424         /* and the mode of the element type is an int of
 425          * the same size as the byte mode */
 426         mode = get_type_mode(element_type);
 427         if (!mode_is_int(mode)
 428                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 429                 return 0;
 430
 431         /* if it contains only printable chars and a 0 at the end */
 432         n = get_compound_ent_n_values(ent);
 433         for (i = 0; i < n; ++i) {
 434                 ir_node *irn = get_compound_ent_value(ent, i);
 435                 if(get_irn_opcode(irn) != iro_Const)
 436                         return 0;
 437
 438                 c = (int) get_tarval_long(get_Const_tarval(irn));
 439
 440                 if((i < n - 1 && !(isgraph(c) || isspace(c)))
 441                                 || (i == n - 1 && c != '\0'))
 442                         return 0;
 443         }
 444
 445         /* then we can emit it as a string constant */
 446         return 1;
 447 }
 448
 449 /**
 450  * Dump a string constant.
 451  * No checks are made!!
 452  *
 453  * @param obst The obst to dump on.
 454  * @param ent  The entity to dump.
 455  */
 456 static void dump_string_cst(obstack_t *obst, ir_entity *ent)
 457 {
 458         int      i, n;
 459         ir_type *type;
 460         int      type_size;
 461         int      remaining_space;
 462
 463         obstack_printf(obst, "\t.string \"");
 464         n = get_compound_ent_n_values(ent);
 465
 466         for (i = 0; i < n-1; ++i) {
 467                 ir_node *irn;
 468                 int c;
 469
 470                 irn = get_compound_ent_value(ent, i);
 471                 c = (int) get_tarval_long(get_Const_tarval(irn));
 472
 473                 switch (c) {
 474                 case '"' : obstack_printf(obst, "\\\""); break;
 475                 case '\n': obstack_printf(obst, "\\n"); break;
 476                 case '\r': obstack_printf(obst, "\\r"); break;
 477                 case '\t': obstack_printf(obst, "\\t"); break;
 478                 case '\\': obstack_printf(obst, "\\\\"); break;
 479                 default  :
 480                         if (isprint(c))
 481                                 obstack_printf(obst, "%c", c);
 482                         else
 483                                 obstack_printf(obst, "\\%o", c);
 484                         break;
 485                 }
 486         }
 487         obstack_printf(obst, "\"\n");
 488
 489         type            = get_entity_type(ent);
 490         type_size       = get_type_size_bytes(type);
 491         remaining_space = type_size - n;
 492         assert(remaining_space >= 0);
 493         if(remaining_space > 0) {
 494                 obstack_printf(obst, "\t.skip\t%d\n", remaining_space);
 495         }
 496 }
 497
 498 enum normal_or_bitfield_kind {
 499         NORMAL = 0,
 500         BITFIELD
 501 };
 502
 503 typedef struct {
 504         enum normal_or_bitfield_kind kind;
 505         union {
 506                 ir_node *value;
 507                 unsigned char bf_val;
 508         } v;
 509 } normal_or_bitfield;
 510
 511 /**
 512  * Dump an initializer for a compound entity.
 513  */
 514 static void dump_compound_init(be_gas_decl_env_t *env, obstack_t *obst,
 515                                ir_entity *ent)
 516 {
 517         normal_or_bitfield *vals;
 518         int i, j, n = get_compound_ent_n_values(ent);
 519         int last_ofs;
 520
 521         /* Find the initializer size. Sorrily gcc support a nasty feature:
 522            The last field of a compound may be a flexible array. This allows
 523            initializers bigger than the type size. */
 524         last_ofs = get_type_size_bytes(get_entity_type(ent));
 525         for (i = 0; i < n; ++i) {
 526                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 527                 int bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, 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                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 531                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 532
 533                 offset += (value_len + bits_remainder + 7) >> 3;
 534
 535                 if (offset > last_ofs) {
 536                         last_ofs = offset;
 537                 }
 538         }
 539
 540         /*
 541          * In the worst case, every initializer allocates one byte.
 542          * Moreover, initializer might be big, do not allocate on stack.
 543          */
 544         vals = xcalloc(last_ofs, sizeof(vals[0]));
 545
 546         /* collect the values and store them at the offsets */
 547         for (i = 0; i < n; ++i) {
 548                 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
 549                 int path_len = get_compound_graph_path_length(path);
 550                 int offset = get_compound_ent_value_offset_bytes(ent, i);
 551                 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
 552                 ir_node *value = get_compound_ent_value(ent, i);
 553                 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
 554                 int value_len = get_type_size_bits(get_entity_type(last_ent));
 555                 assert(offset >= 0);
 556                 assert(offset_bits >= 0);
 557
 558                 if (offset_bits != 0 ||
 559                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
 560                         tarval *shift, *shifted;
 561                         tarval *tv = get_atomic_init_tv(value);
 562                         if (tv == NULL) {
 563                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
 564                                       get_entity_ld_name(ent));
 565                         }
 566                         tv = tarval_convert_to(tv, mode_Lu);
 567                         shift = new_tarval_from_long(offset_bits, mode_Is);
 568                         shifted = tarval_shl(tv, shift);
 569                         if (shifted == tarval_bad || shifted == tarval_undefined) {
 570                                 panic("Couldn't shift numeric value for bitfield initializer '%s'\n",
 571                                       get_entity_ld_name(ent));
 572                         }
 573
 574                         for (j = 0; value_len > 0; ++j) {
 575                                 assert(offset + j < last_ofs);
 576                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
 577                                 vals[offset + j].kind = BITFIELD;
 578                                 vals[offset + j].v.bf_val |= get_tarval_sub_bits(shifted, j);
 579                                 value_len -= 8 - offset_bits;
 580                                 offset_bits = 0;
 581                         }
 582                 } else {
 583                         assert(offset < last_ofs);
 584                         assert(vals[offset].kind == NORMAL);
 585                         assert(vals[offset].v.value == NULL);
 586                         vals[offset].v.value = value;
 587                 }
 588         }
 589
 590         /* now write them sorted */
 591         for (i = 0; i < last_ofs; ) {
 592                 int space = 0, skip = 0;
 593                 if (vals[i].kind == NORMAL) {
 594                         if(vals[i].v.value != NULL) {
 595                                 dump_atomic_init(env, obst, vals[i].v.value);
 596                                 skip = get_mode_size_bytes(get_irn_mode(vals[i].v.value)) - 1;
 597                         } else {
 598                                 space = 1;
 599                         }
 600                 } else {
 601                         assert(vals[i].kind == BITFIELD);
 602                         obstack_printf(obst, "\t.byte\t%d\n", vals[i].v.bf_val);
 603                 }
 604
 605                 ++i;
 606                 while (i < last_ofs && vals[i].kind == NORMAL && vals[i].v.value == NULL) {
 607                         ++space;
 608                         ++i;
 609                 }
 610                 space -= skip;
 611                 assert(space >= 0);
 612
 613                 /* a gap */
 614                 if (space > 0)
 615                         obstack_printf(obst, "\t.skip\t%d\n", space);
 616         }
 617         xfree(vals);
 618 }
 619
 620 /**
 621  * Dump a global entity.
 622  *
 623  * @param env           the gas output environment
 624  * @param ent           the entity to be dumped
 625  * @param emit_commons  if non-zero, emit commons (non-local uninitialized entities)
 626  */
 627 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent, int emit_commons)
 628 {
 629         obstack_t *obst;
 630         ir_type *type = get_entity_type(ent);
 631         const char *ld_name = get_entity_ld_name(ent);
 632         int align = get_type_alignment_bytes(type);
 633         int emit_as_common = 0;
 634         ir_variability variability;
 635         ir_visibility visibility;
 636
 637         obst = env->data_obst;
 638         if (is_Method_type(type)) {
 639                 if (get_method_img_section(ent) == section_constructors) {
 640                         obst = env->ctor_obst;
 641                         obstack_printf(obst, ".balign\t%d\n", align);
 642                         dump_size_type(obst, align);
 643                         obstack_printf(obst, "%s\n", ld_name);
 644                 }
 645                 return;
 646         }
 647
 648         variability = get_entity_variability(ent);
 649         visibility = get_entity_visibility(ent);
 650         if (variability == variability_constant) {
 651                 /* a constant entity, put it on the rdata */
 652                 obst = env->rodata_obst;
 653         } else if (variability == variability_uninitialized) {
 654                 /* uninitialized entity put it in bss segment */
 655                 obst = env->bss_obst;
 656                 if (emit_commons && visibility != visibility_local)
 657                         emit_as_common = 1;
 658         }
 659
 660         be_dbg_variable(env->main_env->db_handle, obst, ent);
 661
 662         /* global or not global */
 663         if (visibility == visibility_external_visible && !emit_as_common) {
 664                 obstack_printf(obst, ".global\t%s\n", ld_name);
 665         } else if(visibility == visibility_external_allocated) {
 666                 obstack_printf(obst, ".global\t%s\n", ld_name);
 667                 /* we can return now... */
 668                 return;
 669         }
 670         /* alignment */
 671         if (align > 1 && !emit_as_common) {
 672                 obstack_printf(obst, ".balign\t%d\n", align);
 673         }
 674
 675         if (!emit_as_common) {
 676                 obstack_printf(obst, "%s:\n", ld_name);
 677         }
 678
 679         if (variability == variability_uninitialized) {
 680                 if(emit_as_common) {
 681                         if (be_gas_flavour == GAS_FLAVOUR_NORMAL)
 682                                 obstack_printf(obst, "\t.comm %s,%d,%d\n",
 683                                         ld_name, get_type_size_bytes(type), align);
 684                         else
 685                                 obstack_printf(obst, "\t.comm %s,%d # %d\n",
 686                                         ld_name, get_type_size_bytes(type), align);
 687                 } else {
 688                         obstack_printf(obst, "\t.zero %d\n", get_type_size_bytes(type));
 689                 }
 690         } else {
 691                 if (is_atomic_entity(ent)) {
 692                         dump_atomic_init(env, obst, get_atomic_ent_value(ent));
 693                 } else {
 694                         /* sort_compound_ent_values(ent); */
 695
 696                         switch (get_type_tpop_code(get_entity_type(ent))) {
 697                         case tpo_array:
 698                                 if (ent_is_string_const(ent))
 699                                         dump_string_cst(obst, ent);
 700                                 else
 701                                         dump_compound_init(env, obst, ent);
 702                                 break;
 703                         case tpo_struct:
 704                         case tpo_class:
 705                         case tpo_union:
 706                                 dump_compound_init(env, obst, ent);
 707                                 break;
 708                         default:
 709                                 assert(0);
 710                         }
 711                 }
 712         }
 713 }
 714
 715 /**
 716  * Dumps declarations of global variables and the initialization code.
 717  *
 718  * @param gt                a global like type, either the global or the TLS one
 719  * @param env               an environment
 720  * @param emit_commons      if non-zero, emit commons (non-local uninitialized entities)
 721  * @param only_emit_marked  if non-zero, external allocated entities that do not have
 722  *                          its visited flag set are ignored
 723  */
 724 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
 725                               int emit_commons, int only_emit_marked)
 726 {
 727         int i, n = get_compound_n_members(gt);
 728         waitq *worklist = new_waitq();
 729
 730         if (only_emit_marked) {
 731                 for (i = 0; i < n; i++) {
 732                         ir_entity *ent = get_compound_member(gt, i);
 733                         if (is_entity_backend_marked(ent) ||
 734                             get_entity_visibility(ent) != visibility_external_allocated) {
 735                                 waitq_put(worklist, ent);
 736                                 set_entity_backend_marked(ent, 1);
 737                         }
 738                 }
 739         } else {
 740                 for (i = 0; i < n; i++) {
 741                         ir_entity *ent = get_compound_member(gt, i);
 742                         set_entity_backend_marked(ent, 1);
 743                         waitq_put(worklist, ent);
 744                 }
 745         }
 746
 747         env->worklist = worklist;
 748
 749         while (!waitq_empty(worklist)) {
 750                 ir_entity *ent = waitq_get(worklist);
 751
 752                 dump_global(env, ent, emit_commons);
 753         }
 754
 755         del_waitq(worklist);
 756         env->worklist = NULL;
 757 }
 758
 759 /************************************************************************/
 760
 761 /* Generate all entities. */
 762 void be_gas_emit_decls(be_emit_env_t *emit, const be_main_env_t *main_env,
 763                        int only_emit_marked_entities)
 764 {
 765         be_gas_decl_env_t env;
 766         obstack_t rodata, data, bss, ctor;
 767         int    size;
 768         char   *cp;
 769
 770         /* dump the global type */
 771         obstack_init(&rodata);
 772         obstack_init(&data);
 773         obstack_init(&bss);
 774         obstack_init(&ctor);
 775
 776         env.rodata_obst = &rodata;
 777         env.data_obst   = &data;
 778         env.bss_obst    = &bss;
 779         env.ctor_obst   = &ctor;
 780         env.main_env    = main_env;
 781
 782         be_gas_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
 783
 784         size = obstack_object_size(&data);
 785         cp   = obstack_finish(&data);
 786         if (size > 0) {
 787                 be_gas_emit_switch_section(emit, GAS_SECTION_DATA);
 788                 be_emit_string_len(emit, cp, size);
 789                 be_emit_write_line(emit);
 790         }
 791
 792         size = obstack_object_size(&rodata);
 793         cp   = obstack_finish(&rodata);
 794         if (size > 0) {
 795                 be_gas_emit_switch_section(emit, GAS_SECTION_RODATA);
 796                 be_emit_string_len(emit, cp, size);
 797                 be_emit_write_line(emit);
 798         }
 799
 800         size = obstack_object_size(&bss);
 801         cp   = obstack_finish(&bss);
 802         if (size > 0) {
 803                 be_gas_emit_switch_section(emit, GAS_SECTION_COMMON);
 804                 be_emit_string_len(emit, cp, size);
 805                 be_emit_write_line(emit);
 806         }
 807
 808         size = obstack_object_size(&ctor);
 809         cp   = obstack_finish(&ctor);
 810         if (size > 0) {
 811                 be_gas_emit_switch_section(emit, GAS_SECTION_CTOR);
 812                 be_emit_string_len(emit, cp, size);
 813                 be_emit_write_line(emit);
 814         }
 815
 816         obstack_free(&rodata, NULL);
 817         obstack_free(&data, NULL);
 818         obstack_free(&bss, NULL);
 819         obstack_free(&ctor, NULL);
 820
 821         /* dump the Thread Local Storage */
 822         obstack_init(&data);
 823
 824         env.rodata_obst = &data;
 825         env.data_obst   = &data;
 826         env.bss_obst    = &data;
 827         env.ctor_obst   = NULL;
 828
 829         be_gas_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
 830
 831         size = obstack_object_size(&data);
 832         cp   = obstack_finish(&data);
 833         if (size > 0) {
 834                 be_gas_emit_switch_section(emit, GAS_SECTION_TLS);
 835                 be_emit_cstring(emit, ".balign\t32\n");
 836                 be_emit_write_line(emit);
 837                 be_emit_string_len(emit, cp, size);
 838                 be_emit_write_line(emit);
 839         }
 840
 841         obstack_free(&data, NULL);
 842 }