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

   1 /*
   2  * Copyright (C) 1995-2008 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 #include "config.h"
  28
  29 #include "begnuas.h"
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34 #include <assert.h>
  35
  36 #include "obst.h"
  37 #include "tv.h"
  38 #include "irnode.h"
  39 #include "irprog.h"
  40 #include "entity_t.h"
  41 #include "error.h"
  42
  43 #include "be_t.h"
  44 #include "beemitter.h"
  45 #include "be_dbgout.h"
  46
  47 /** by default, we generate assembler code for the Linux gas */
  48 object_file_format_t  be_gas_object_file_format = OBJECT_FILE_FORMAT_ELF;
  49 bool                  be_gas_emit_types         = true;
  50 char                  be_gas_elf_type_char      = '@';
  51
  52 static be_gas_section_t current_section = (be_gas_section_t) -1;
  53
  54 /**
  55  * An environment containing all needed dumper data.
  56  * Currently we create the file completely in memory first, then
  57  * write it to the disk. This is an artifact from the old C-generating backend
  58  * and even there NOT needed. So we might change it in the future.
  59  */
  60 typedef struct _be_gas_decl_env {
  61         be_gas_section_t     section;
  62         const be_main_env_t *main_env;
  63 } be_gas_decl_env_t;
  64
  65 static void emit_section_macho(be_gas_section_t section)
  66 {
  67         be_gas_section_t  base  = section & GAS_SECTION_TYPE_MASK;
  68         be_gas_section_t  flags = section & ~GAS_SECTION_TYPE_MASK;
  69         const char       *name;
  70
  71         if (current_section == section)
  72                 return;
  73         current_section = section;
  74
  75         /* shortforms */
  76         if (flags == 0) {
  77                 switch (base) {
  78                 case GAS_SECTION_TEXT:            name = "text";          break;
  79                 case GAS_SECTION_DATA:            name = "data";          break;
  80                 case GAS_SECTION_RODATA:          name = "const";         break;
  81                 case GAS_SECTION_BSS:             name = "data";          break;
  82                 case GAS_SECTION_CONSTRUCTORS:    name = "mod_init_func"; break;
  83                 case GAS_SECTION_DESTRUCTORS:     name = "mod_term_func"; break;
  84                 case GAS_SECTION_PIC_TRAMPOLINES: name = "section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5"; break;
  85                 case GAS_SECTION_PIC_SYMBOLS:     name = "section\t__IMPORT,__pointers,non_lazy_symbol_pointers"; break;
  86                 case GAS_SECTION_CSTRING:         name = "cstring";       break;
  87                 default: panic("unsupported scetion type 0x%X", section);
  88                 }
  89                 be_emit_irprintf("\t.%s\n", name);
  90                 be_emit_write_line();
  91         } else if (flags & GAS_SECTION_FLAG_COMDAT) {
  92                 switch (base) {
  93                 case GAS_SECTION_TEXT:            name = "section __TEXT,__textcoal_nt,coalesced,pure_instructions"; break;
  94                 case GAS_SECTION_BSS:
  95                 case GAS_SECTION_DATA:            name = "section __DATA,__datacoal_nt,coalesced"; break;
  96                 case GAS_SECTION_RODATA:          name = "section __TEXT,__const_coal,coalesced"; break;
  97                 case GAS_SECTION_CSTRING:         name = "section __TEXT,__const_coal,coalesced"; break;
  98                 default: panic("unsupported scetion type 0x%X", section);
  99                 }
 100         } else {
 101                 panic("unsupported section type 0x%X\n", section);
 102         }
 103 }
 104
 105 static void emit_section_sparc(be_gas_section_t section, const ir_entity *entity)
 106 {
 107         be_gas_section_t base = section & GAS_SECTION_TYPE_MASK;
 108         be_gas_section_t flags = section & ~GAS_SECTION_TYPE_MASK;
 109         static const char *const basename[] = {
 110                 "text", "data", "rodata", "bss", "ctors", "dtors"
 111         };
 112
 113         if (current_section == section && !(section & GAS_SECTION_FLAG_COMDAT))
 114                 return;
 115         current_section = section;
 116
 117         be_emit_cstring("\t.section\t\".");
 118
 119         /* Part1: section-name */
 120         if (flags & GAS_SECTION_FLAG_TLS)
 121                 be_emit_char('t');
 122         assert(base < sizeof(basename)/sizeof(basename[0]));
 123         be_emit_string(basename[base]);
 124
 125         if (flags & GAS_SECTION_FLAG_COMDAT) {
 126                 be_emit_char('.');
 127                 be_gas_emit_entity(entity);
 128         }
 129         be_emit_char('"');
 130
 131         /* for the simple sections we're done here */
 132         if (flags == 0)
 133                 goto end;
 134
 135         be_emit_cstring(",#alloc");
 136
 137         switch (base) {
 138         case GAS_SECTION_TEXT: be_emit_cstring(",#execinstr"); break;
 139         case GAS_SECTION_DATA:
 140         case GAS_SECTION_BSS:  be_emit_cstring(",#write"); break;
 141         default:
 142                 /* nothing */
 143                 break;
 144         }
 145         if (flags & GAS_SECTION_FLAG_TLS) {
 146                 be_emit_cstring(",#tls");
 147         }
 148
 149 end:
 150         be_emit_char('\n');
 151         be_emit_write_line();
 152 }
 153
 154 static void emit_section(be_gas_section_t section, const ir_entity *entity)
 155 {
 156         be_gas_section_t base = section & GAS_SECTION_TYPE_MASK;
 157         be_gas_section_t flags = section & ~GAS_SECTION_TYPE_MASK;
 158         static const char *const basename[] = {
 159                 "text", "data", "rodata", "bss", "ctors", "dtors"
 160         };
 161         static const char *const type[] = {
 162                 "progbits", "progbits", "progbits", "nobits", "init_array", "fini_array"
 163         };
 164
 165         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
 166                 emit_section_macho(section);
 167                 return;
 168         } else if(be_gas_object_file_format == OBJECT_FILE_FORMAT_ELF_SPARC) {
 169                 emit_section_sparc(section, entity);
 170                 return;
 171         }
 172
 173         if (current_section == section && !(section & GAS_SECTION_FLAG_COMDAT))
 174                 return;
 175         current_section = section;
 176
 177         /* shortforms */
 178         if (flags == 0) {
 179                 switch (base) {
 180                 case GAS_SECTION_TEXT:
 181                         be_emit_cstring("\t.text\n");
 182                         be_emit_write_line();
 183                         return;
 184                 case GAS_SECTION_DATA:
 185                         be_emit_cstring("\t.data\n");
 186                         be_emit_write_line();
 187                         return;
 188                 case GAS_SECTION_RODATA:
 189                         be_emit_cstring("\t.section\t.rodata\n");
 190                         be_emit_write_line();
 191                         return;
 192                 case GAS_SECTION_BSS:
 193                         be_emit_cstring("\t.bss\n");
 194                         be_emit_write_line();
 195                         return;
 196                 default:
 197                         break;
 198                 }
 199         }
 200
 201         assert(base < sizeof(basename)/sizeof(basename[0]));
 202         be_emit_cstring("\t.section\t.");
 203         /* section name */
 204         if (flags & GAS_SECTION_FLAG_TLS)
 205                 be_emit_char('t');
 206         be_emit_string(basename[base]);
 207         if (flags & GAS_SECTION_FLAG_COMDAT) {
 208                 be_emit_char('.');
 209                 be_gas_emit_entity(entity);
 210         }
 211
 212         /* section flags */
 213         be_emit_cstring(",\"");
 214         if (be_gas_object_file_format != OBJECT_FILE_FORMAT_COFF)
 215                 be_emit_char('a');
 216         if (base == GAS_SECTION_TEXT)
 217                 be_emit_char('x');
 218         if (base != GAS_SECTION_RODATA && base != GAS_SECTION_TEXT)
 219                 be_emit_char('w');
 220         if (flags & GAS_SECTION_FLAG_TLS)
 221                 be_emit_char('T');
 222         if (flags & GAS_SECTION_FLAG_COMDAT)
 223                 be_emit_char('G');
 224         /* section type */
 225         if (be_gas_object_file_format != OBJECT_FILE_FORMAT_COFF) {
 226                 be_emit_cstring("\",");
 227                 be_emit_char(be_gas_elf_type_char);
 228                 be_emit_string(type[base]);
 229         }
 230
 231         if (flags & GAS_SECTION_FLAG_COMDAT) {
 232                 be_emit_char(',');
 233                 be_gas_emit_entity(entity);
 234                 be_emit_cstring(",comdat");
 235         }
 236         be_emit_char('\n');
 237         be_emit_write_line();
 238 }
 239
 240
 241
 242 void be_gas_emit_switch_section(be_gas_section_t section)
 243 {
 244         /* you have to produce a switch_section call with entity manually
 245          * for comdat sections */
 246         assert( !(section & GAS_SECTION_FLAG_COMDAT));
 247
 248         emit_section(section, NULL);
 249 }
 250
 251 static tarval *get_initializer_tarval(const ir_initializer_t *initializer)
 252 {
 253         if (initializer->kind == IR_INITIALIZER_TARVAL)
 254                 return initializer->tarval.value;
 255         if (initializer->kind == IR_INITIALIZER_CONST) {
 256                 ir_node *node = initializer->consti.value;
 257                 if (is_Const(node)) {
 258                         return get_Const_tarval(node);
 259                 }
 260         }
 261         return get_tarval_undefined();
 262 }
 263
 264 static int initializer_is_string_const(const ir_initializer_t *initializer)
 265 {
 266         size_t i, len;
 267         int found_printable = 0;
 268
 269         if (initializer->kind != IR_INITIALIZER_COMPOUND)
 270                 return 0;
 271
 272         len = initializer->compound.n_initializers;
 273         if (len < 1)
 274                 return 0;
 275         for (i = 0; i < len; ++i) {
 276                 int               c;
 277                 tarval           *tv;
 278                 ir_mode          *mode;
 279                 ir_initializer_t *sub_initializer
 280                         = initializer->compound.initializers[i];
 281
 282                 tv = get_initializer_tarval(sub_initializer);
 283                 if (!tarval_is_constant(tv))
 284                         return 0;
 285
 286                 mode = get_tarval_mode(tv);
 287                 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
 288                         return 0;
 289
 290                 c = get_tarval_long(tv);
 291                 if (isgraph(c) || isspace(c))
 292                         found_printable = 1;
 293                 else if (c != 0)
 294                         return 0;
 295
 296                 if (i == len - 1 && c != '\0')
 297                         return 0;
 298         }
 299
 300         return found_printable;
 301 }
 302
 303 static bool initializer_is_null(const ir_initializer_t *initializer)
 304 {
 305         switch (initializer->kind) {
 306         case IR_INITIALIZER_NULL:
 307                 return true;
 308         case IR_INITIALIZER_TARVAL: {
 309                 tarval *tv = initializer->tarval.value;
 310                 return tarval_is_null(tv);
 311         }
 312         case IR_INITIALIZER_CONST: {
 313                 ir_node *value = initializer->consti.value;
 314                 if (!is_Const(value))
 315                         return false;
 316                 return is_Const_null(value);
 317         }
 318         case IR_INITIALIZER_COMPOUND: {
 319                 size_t i;
 320                 for (i = 0; i < initializer->compound.n_initializers; ++i) {
 321                         ir_initializer_t *subinitializer
 322                                 = initializer->compound.initializers[i];
 323                         if (!initializer_is_null(subinitializer))
 324                                 return false;
 325                 }
 326                 return true;
 327         }
 328         }
 329         panic("invalid initializer in initializer_is_null");
 330 }
 331
 332 /**
 333  * Determine if an entity is a string constant
 334  * @param ent The entity
 335  * @return 1 if it is a string constant, 0 otherwise
 336  */
 337 static int entity_is_string_const(const ir_entity *ent)
 338 {
 339         ir_type *type, *element_type;
 340         ir_mode *mode;
 341         int i, c, n;
 342
 343         type = get_entity_type(ent);
 344
 345         /* if it's an array */
 346         if (!is_Array_type(type))
 347                 return 0;
 348
 349         element_type = get_array_element_type(type);
 350
 351         /* and the array's element type is primitive */
 352         if (!is_Primitive_type(element_type))
 353                 return 0;
 354
 355         /* and the mode of the element type is an int of
 356          * the same size as the byte mode */
 357         mode = get_type_mode(element_type);
 358         if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
 359                 return 0;
 360
 361         if (ent->initializer != NULL) {
 362                 return initializer_is_string_const(ent->initializer);
 363         } else if (entity_has_compound_ent_values(ent)) {
 364                 int found_printable = 0;
 365                 /* if it contains only printable chars and a 0 at the end */
 366                 n = get_compound_ent_n_values(ent);
 367                 for (i = 0; i < n; ++i) {
 368                         ir_node *irn = get_compound_ent_value(ent, i);
 369                         if (! is_Const(irn))
 370                                 return 0;
 371
 372                         c = (int) get_tarval_long(get_Const_tarval(irn));
 373
 374                         if (isgraph(c) || isspace(c))
 375                                 found_printable = 1;
 376                         else if (c != 0)
 377                                 return 0;
 378
 379                         if (i == n - 1 && c != '\0')
 380                                 return 0;
 381                 }
 382                 return found_printable;
 383         }
 384
 385         return 0;
 386 }
 387
 388 static bool entity_is_null(const ir_entity *entity)
 389 {
 390         if (entity->initializer != NULL) {
 391                 return initializer_is_null(entity->initializer);
 392         } else if (entity_has_compound_ent_values(entity)) {
 393                 /* I'm too lazy to implement this case as compound graph paths will be
 394                  * remove anyway in the future */
 395                 return false;
 396         }
 397         /* uninitialized, NULL is fine */
 398         return true;
 399 }
 400
 401 static bool is_comdat(const ir_entity *entity)
 402 {
 403         ir_linkage linkage = get_entity_linkage(entity);
 404         return (linkage & IR_LINKAGE_MERGE)
 405                 && (linkage & IR_LINKAGE_GARBAGE_COLLECT);
 406 }
 407
 408 static be_gas_section_t determine_basic_section(const ir_entity *entity)
 409 {
 410         ir_linkage linkage;
 411
 412         if (is_method_entity(entity))
 413                 return GAS_SECTION_TEXT;
 414
 415         linkage = get_entity_linkage(entity);
 416         if (linkage & IR_LINKAGE_CONSTANT) {
 417                 /* mach-o is the only one with a cstring section */
 418                 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O
 419                                 && entity_is_string_const(entity))
 420                         return GAS_SECTION_CSTRING;
 421
 422                 return GAS_SECTION_RODATA;
 423         }
 424         if (entity_is_null(entity))
 425                 return GAS_SECTION_BSS;
 426
 427         return GAS_SECTION_DATA;
 428 }
 429
 430 static be_gas_section_t determine_section(be_gas_decl_env_t *env,
 431                                           const ir_entity *entity)
 432 {
 433         ir_type *owner = get_entity_owner(entity);
 434
 435         if (owner == get_segment_type(IR_SEGMENT_GLOBAL)) {
 436                 be_gas_section_t section = determine_basic_section(entity);
 437                 if (is_comdat(entity))
 438                         section |= GAS_SECTION_FLAG_COMDAT;
 439                 return section;
 440         } else if (env != NULL && owner == env->main_env->pic_symbols_type) {
 441                 return GAS_SECTION_PIC_SYMBOLS;
 442         } else if (env != NULL && owner == env->main_env->pic_trampolines_type) {
 443                 return GAS_SECTION_PIC_TRAMPOLINES;
 444         } else if (owner == get_segment_type(IR_SEGMENT_CONSTRUCTORS)) {
 445                 return GAS_SECTION_CONSTRUCTORS;
 446         } else if (owner == get_segment_type(IR_SEGMENT_DESTRUCTORS)) {
 447                 return GAS_SECTION_DESTRUCTORS;
 448         } else if (owner == get_segment_type(IR_SEGMENT_THREAD_LOCAL)) {
 449                 be_gas_section_t section = determine_basic_section(entity);
 450                 if (is_comdat(entity))
 451                         section |= GAS_SECTION_FLAG_COMDAT;
 452
 453                 return section | GAS_SECTION_FLAG_TLS;
 454         }
 455
 456         /* the java frontend keeps some functions inside classes */
 457         if (is_Class_type(owner)) {
 458                 return determine_basic_section(entity);
 459         }
 460
 461         panic("Couldn't determine section for %+F?!?", entity);
 462 }
 463
 464 static void emit_weak(const ir_entity *entity)
 465 {
 466         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
 467                 be_emit_cstring("\t.weak_reference ");
 468         } else {
 469                 be_emit_cstring("\t.weak ");
 470         }
 471         be_gas_emit_entity(entity);
 472         be_emit_char('\n');
 473         be_emit_write_line();
 474 }
 475
 476 static void emit_visibility(const ir_entity *entity)
 477 {
 478         ir_linkage linkage = get_entity_linkage(entity);
 479
 480         if (get_entity_linkage(entity) & IR_LINKAGE_WEAK) {
 481                 emit_weak(entity);
 482                 /* Note: .weak seems to imply .globl so no need to output .globl */
 483         } else if (get_entity_visibility(entity) == ir_visibility_default) {
 484                 be_emit_cstring(".globl ");
 485                 be_gas_emit_entity(entity);
 486                 be_emit_char('\n');
 487                 be_emit_write_line();
 488         }
 489
 490         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O
 491                         && (linkage & IR_LINKAGE_HIDDEN_USER)) {
 492                 be_emit_cstring("\t.no_dead_strip ");
 493                 be_gas_emit_entity(entity);
 494                 be_emit_char('\n');
 495                 be_emit_write_line();
 496         }
 497 }
 498
 499 void be_gas_emit_function_prolog(const ir_entity *entity, unsigned po2alignment)
 500 {
 501         be_gas_section_t section = determine_section(NULL, entity);
 502         emit_section(section, entity);
 503
 504         /* write the begin line (makes the life easier for scripts parsing the
 505          * assembler) */
 506         be_emit_write_line();
 507         be_emit_cstring("# -- Begin  ");
 508         be_gas_emit_entity(entity);
 509         be_emit_char('\n');
 510         be_emit_write_line();
 511
 512         if (po2alignment > 0) {
 513                 const char *fill_byte = "";
 514                 unsigned    maximum_skip = (1 << po2alignment) - 1;
 515                 /* gcc fills space between function with 0x90... */
 516                 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
 517                         fill_byte = "0x90";
 518                 }
 519                 be_emit_cstring("\t.p2align ");
 520                 be_emit_irprintf("%u,%s,%u\n", po2alignment, fill_byte, maximum_skip);
 521                 be_emit_write_line();
 522         }
 523         emit_visibility(entity);
 524
 525         switch (be_gas_object_file_format) {
 526         case OBJECT_FILE_FORMAT_ELF:
 527         case OBJECT_FILE_FORMAT_ELF_SPARC:
 528                 be_emit_cstring("\t.type\t");
 529                 be_gas_emit_entity(entity);
 530                 be_emit_cstring(", ");
 531                 be_emit_char(be_gas_elf_type_char);
 532                 be_emit_cstring("function\n");
 533                 be_emit_write_line();
 534                 break;
 535         case OBJECT_FILE_FORMAT_COFF:
 536                 be_emit_cstring("\t.def\t");
 537                 be_gas_emit_entity(entity);
 538                 be_emit_cstring(";");
 539                 if (get_entity_visibility(entity) == ir_visibility_local) {
 540                         be_emit_cstring("\t.scl\t3;");
 541                 } else {
 542                         be_emit_cstring("\t.scl\t2;");
 543                 }
 544                 be_emit_cstring("\t.type\t32;\t.endef\n");
 545                 be_emit_write_line();
 546                 break;
 547         case OBJECT_FILE_FORMAT_MACH_O:
 548                 break;
 549         }
 550         be_gas_emit_entity(entity);
 551         be_emit_cstring(":\n");
 552         be_emit_write_line();
 553 }
 554
 555 void be_gas_emit_function_epilog(const ir_entity *entity)
 556 {
 557         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_ELF) {
 558                 be_emit_cstring("\t.size\t");
 559                 be_gas_emit_entity(entity);
 560                 be_emit_cstring(", .-");
 561                 be_gas_emit_entity(entity);
 562                 be_emit_char('\n');
 563                 be_emit_write_line();
 564         }
 565
 566         be_emit_cstring("# -- End  ");
 567         be_gas_emit_entity(entity);
 568         be_emit_char('\n');
 569         be_emit_write_line();
 570 }
 571
 572 /************************************************************************/
 573
 574 /**
 575  * Output a tarval.
 576  *
 577  * @param tv     the tarval
 578  * @param bytes  the width of the tarvals value in bytes
 579  */
 580 static void emit_arith_tarval(tarval *tv, int bytes)
 581 {
 582         switch (bytes) {
 583         case 1:
 584                 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
 585                 return;
 586
 587         case 2:
 588                 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 589                 return;
 590
 591         case 4:
 592                 be_emit_irprintf("0x%02x%02x%02x%02x",
 593                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 594                 return;
 595
 596         case 8:
 597                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
 598                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 599                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 600                 return;
 601
 602         case 12:
 603                 /* Beware: Mixed endian output!  One little endian number emitted as
 604                  * three longs.  Each long initializer is written in big endian. */
 605                 be_emit_irprintf(
 606                         "\t.long\t0x%02x%02x%02x%02x\n"
 607                         "\t.long\t0x%02x%02x%02x%02x\n"
 608                         "\t.long\t0x%02x%02x%02x%02x",
 609                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 610                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0),
 611                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 612                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 613                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 614                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8)
 615                 );
 616                 return;
 617
 618         case 16:
 619                 /* Beware: Mixed endian output!  One little endian number emitted as
 620                  * three longs.  Each long initializer is written in big endian. */
 621                 be_emit_irprintf(
 622                         "\t.long\t0x%02x%02x%02x%02x\n"
 623                         "\t.long\t0x%02x%02x%02x%02x\n"
 624                         "\t.long\t0x%02x%02x%02x%02x\n"
 625                         "\t.long\t0x%02x%02x%02x%02x",
 626                         get_tarval_sub_bits(tv,  3), get_tarval_sub_bits(tv,  2),
 627                         get_tarval_sub_bits(tv,  1), get_tarval_sub_bits(tv,  0),
 628                         get_tarval_sub_bits(tv,  7), get_tarval_sub_bits(tv,  6),
 629                         get_tarval_sub_bits(tv,  5), get_tarval_sub_bits(tv,  4),
 630                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 631                         get_tarval_sub_bits(tv,  9), get_tarval_sub_bits(tv,  8),
 632                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 14),
 633                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12)
 634                 );
 635                 return;
 636         }
 637
 638         panic("Can't dump a tarval with %d bytes", bytes);
 639 }
 640
 641 /**
 642  * Return the label prefix for labeled instructions.
 643  */
 644 const char *be_gas_insn_label_prefix(void)
 645 {
 646         return ".LE";
 647 }
 648
 649 /**
 650  * Return the tarval of an atomic initializer.
 651  *
 652  * @param init  a node representing the initializer (on the const code irg)
 653  *
 654  * @return the tarval
 655  */
 656 static tarval *get_atomic_init_tv(ir_node *init)
 657 {
 658         for (;;) {
 659                 ir_mode *mode = get_irn_mode(init);
 660
 661                 switch (get_irn_opcode(init)) {
 662
 663                 case iro_Cast:
 664                         init = get_Cast_op(init);
 665                         continue;
 666
 667                 case iro_Conv:
 668                         init = get_Conv_op(init);
 669                         continue;
 670
 671                 case iro_Const:
 672                         return get_Const_tarval(init);
 673
 674                 case iro_SymConst:
 675                         switch (get_SymConst_kind(init)) {
 676                         case symconst_type_size:
 677                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 678
 679                         case symconst_type_align:
 680                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 681
 682                         case symconst_ofs_ent:
 683                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 684
 685                         case symconst_enum_const:
 686                                 return get_enumeration_value(get_SymConst_enum(init));
 687
 688                         default:
 689                                 return NULL;
 690                         }
 691
 692                 default:
 693                         return NULL;
 694                 }
 695         }
 696 }
 697
 698 /**
 699  * Dump an atomic value.
 700  *
 701  * @param env   the gas output environment
 702  * @param init  a node representing the atomic value (on the const code irg)
 703  */
 704 static void do_emit_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 705 {
 706         ir_mode *mode = get_irn_mode(init);
 707         int bytes     = get_mode_size_bytes(mode);
 708         tarval *tv;
 709         ir_entity *ent;
 710
 711         init = skip_Id(init);
 712
 713         switch (get_irn_opcode(init)) {
 714         case iro_Cast:
 715                 do_emit_atomic_init(env, get_Cast_op(init));
 716                 return;
 717
 718         case iro_Conv:
 719                 do_emit_atomic_init(env, get_Conv_op(init));
 720                 return;
 721
 722         case iro_Const:
 723                 tv = get_Const_tarval(init);
 724
 725                 /* it's a arithmetic value */
 726                 emit_arith_tarval(tv, bytes);
 727                 return;
 728
 729         case iro_SymConst:
 730                 switch (get_SymConst_kind(init)) {
 731                 case symconst_addr_ent:
 732                         ent = get_SymConst_entity(init);
 733                         be_gas_emit_entity(ent);
 734                         break;
 735
 736                 case symconst_ofs_ent:
 737                         ent = get_SymConst_entity(init);
 738                         be_emit_irprintf("%d", get_entity_offset(ent));
 739                         break;
 740
 741                 case symconst_type_size:
 742                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 743                         break;
 744
 745                 case symconst_type_align:
 746                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 747                         break;
 748
 749                 case symconst_enum_const:
 750                         tv = get_enumeration_value(get_SymConst_enum(init));
 751                         emit_arith_tarval(tv, bytes);
 752                         break;
 753
 754                 default:
 755                         assert(!"emit_atomic_init(): don't know how to init from this SymConst");
 756                 }
 757                 return;
 758
 759         case iro_Add:
 760                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 761                         panic("Constant must be int or pointer for '+' to work");
 762                 }
 763                 do_emit_atomic_init(env, get_Add_left(init));
 764                 be_emit_cstring(" + ");
 765                 do_emit_atomic_init(env, get_Add_right(init));
 766                 return;
 767
 768         case iro_Sub:
 769                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 770                         panic("Constant must be int or pointer for '-' to work");
 771                 }
 772                 do_emit_atomic_init(env, get_Sub_left(init));
 773                 be_emit_cstring(" - ");
 774                 do_emit_atomic_init(env, get_Sub_right(init));
 775                 return;
 776
 777         case iro_Mul:
 778                 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 779                         panic("Constant must be int or pointer for '*' to work");
 780                 }
 781                 do_emit_atomic_init(env, get_Mul_left(init));
 782                 be_emit_cstring(" * ");
 783                 do_emit_atomic_init(env, get_Mul_right(init));
 784                 return;
 785
 786         case iro_Unknown:
 787                 be_emit_cstring("0");
 788                 return;
 789
 790         default:
 791                 panic("emit_atomic_init(): unsupported IR-node %+F", init);
 792         }
 793 }
 794
 795 /**
 796  * Dumps the type for given size (.byte, .long, ...)
 797  *
 798  * @param size  the size in bytes
 799  */
 800 static void emit_size_type(size_t size)
 801 {
 802         switch (size) {
 803         case 1:
 804                 be_emit_cstring("\t.byte\t");
 805                 break;
 806
 807         case 2:
 808                 be_emit_cstring("\t.short\t");
 809                 break;
 810
 811         case 4:
 812                 be_emit_cstring("\t.long\t");
 813                 break;
 814
 815         case 8:
 816                 be_emit_cstring("\t.quad\t");
 817                 break;
 818
 819         case 10:
 820         case 12:
 821         case 16: /* Note: .octa does not work on mac */
 822                 /* handled in arith */
 823                 break;
 824
 825         default:
 826                 panic("Try to dump a type with %u bytes", (unsigned)size);
 827         }
 828 }
 829
 830 /**
 831  * Emit an atomic value.
 832  *
 833  * @param env   the gas output environment
 834  * @param init  a node representing the atomic value (on the const code irg)
 835  */
 836 static void emit_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 837 {
 838         ir_mode *mode = get_irn_mode(init);
 839         int bytes     = get_mode_size_bytes(mode);
 840
 841         emit_size_type(bytes);
 842         do_emit_atomic_init(env, init);
 843         be_emit_char('\n');
 844         be_emit_write_line();
 845 }
 846
 847 /************************************************************************/
 848 /* Routines to dump global variables                                    */
 849 /************************************************************************/
 850
 851 /**
 852  * Dump a string constant.
 853  * No checks are made!!
 854  *
 855  * @param ent  The entity to dump.
 856  */
 857 static void emit_string_cst(const ir_entity *ent)
 858 {
 859         int      i, len;
 860         int      output_len;
 861         ir_type *type;
 862         int      type_size;
 863         int      remaining_space;
 864
 865         len        = get_compound_ent_n_values(ent);
 866         output_len = len;
 867         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
 868                 be_emit_cstring("\t.ascii \"");
 869         } else {
 870                 be_emit_cstring("\t.string \"");
 871                 output_len -= 1;
 872         }
 873
 874         for (i = 0; i < output_len; ++i) {
 875                 ir_node *irn;
 876                 int c;
 877
 878                 irn = get_compound_ent_value(ent, i);
 879                 c = (int) get_tarval_long(get_Const_tarval(irn));
 880
 881                 switch (c) {
 882                 case '"' : be_emit_cstring("\\\""); break;
 883                 case '\n': be_emit_cstring("\\n"); break;
 884                 case '\r': be_emit_cstring("\\r"); break;
 885                 case '\t': be_emit_cstring("\\t"); break;
 886                 case '\\': be_emit_cstring("\\\\"); break;
 887                 default  :
 888                         if (isprint(c))
 889                                 be_emit_char(c);
 890                         else
 891                                 be_emit_irprintf("\\%o", c);
 892                         break;
 893                 }
 894         }
 895         be_emit_cstring("\"\n");
 896         be_emit_write_line();
 897
 898         type            = get_entity_type(ent);
 899         type_size       = get_type_size_bytes(type);
 900         remaining_space = type_size - len;
 901         assert(remaining_space >= 0);
 902         if (remaining_space > 0) {
 903                 be_emit_irprintf("\t.space\t%d\n", remaining_space);
 904         }
 905 }
 906
 907 static void emit_string_initializer(const ir_initializer_t *initializer)
 908 {
 909         size_t i, len;
 910
 911         len = initializer->compound.n_initializers;
 912         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
 913                 be_emit_cstring("\t.ascii \"");
 914         } else {
 915                 be_emit_cstring("\t.string \"");
 916                 len -= 1;
 917         }
 918
 919         for (i = 0; i < len; ++i) {
 920                 const ir_initializer_t *sub_initializer
 921                         = get_initializer_compound_value(initializer, i);
 922
 923                 tarval *tv = get_initializer_tarval(sub_initializer);
 924                 int     c  = get_tarval_long(tv);
 925
 926                 switch (c) {
 927                 case '"' : be_emit_cstring("\\\""); break;
 928                 case '\n': be_emit_cstring("\\n"); break;
 929                 case '\r': be_emit_cstring("\\r"); break;
 930                 case '\t': be_emit_cstring("\\t"); break;
 931                 case '\\': be_emit_cstring("\\\\"); break;
 932                 default  :
 933                         if (isprint(c))
 934                                 be_emit_char(c);
 935                         else
 936                                 be_emit_irprintf("\\%o", c);
 937                         break;
 938                 }
 939         }
 940         be_emit_cstring("\"\n");
 941         be_emit_write_line();
 942 }
 943
 944 enum normal_or_bitfield_kind {
 945         NORMAL = 0,
 946         TARVAL,
 947         BITFIELD
 948 };
 949
 950 typedef struct {
 951         enum normal_or_bitfield_kind kind;
 952         union {
 953                 ir_node       *value;
 954                 tarval        *tarval;
 955                 unsigned char  bf_val;
 956         } v;
 957 } normal_or_bitfield;
 958
 959 static int is_type_variable_size(ir_type *type)
 960 {
 961         (void) type;
 962         /* TODO */
 963         return 0;
 964 }
 965
 966 static size_t get_initializer_size(const ir_initializer_t *initializer,
 967                                    ir_type *type)
 968 {
 969         switch (get_initializer_kind(initializer)) {
 970         case IR_INITIALIZER_TARVAL:
 971                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 972                 return get_type_size_bytes(type);
 973         case IR_INITIALIZER_CONST:
 974         case IR_INITIALIZER_NULL:
 975                 return get_type_size_bytes(type);
 976         case IR_INITIALIZER_COMPOUND:
 977                 if (!is_type_variable_size(type)) {
 978                         return get_type_size_bytes(type);
 979                 } else {
 980                         unsigned n_entries
 981                                 = get_initializer_compound_n_entries(initializer);
 982                         unsigned i;
 983                         unsigned initializer_size = get_type_size_bytes(type);
 984                         for (i = 0; i < n_entries; ++i) {
 985                                 ir_entity *entity = get_compound_member(type, i);
 986                                 ir_type   *type   = get_entity_type(entity);
 987
 988                                 const ir_initializer_t *sub_initializer
 989                                         = get_initializer_compound_value(initializer, i);
 990
 991                                 unsigned offset = get_entity_offset(entity);
 992                                 unsigned size   = get_initializer_size(sub_initializer, type);
 993
 994                                 if (offset + size > initializer_size) {
 995                                         initializer_size = offset + size;
 996                                 }
 997                         }
 998                         return initializer_size;
 999                 }
1000         }
1001
1002         panic("found invalid initializer");
1003 }
1004
1005 #ifndef NDEBUG
1006 static normal_or_bitfield *glob_vals;
1007 static size_t              max_vals;
1008 #endif
1009
1010 static void emit_bitfield(normal_or_bitfield *vals, size_t offset_bits,
1011                           const ir_initializer_t *initializer, ir_type *type)
1012 {
1013         unsigned char  last_bits = 0;
1014         ir_mode       *mode      = get_type_mode(type);
1015         tarval        *tv        = NULL;
1016         unsigned char  curr_bits;
1017         int            value_len;
1018         int            j;
1019
1020         switch (get_initializer_kind(initializer)) {
1021         case IR_INITIALIZER_NULL:
1022                 return;
1023         case IR_INITIALIZER_TARVAL:
1024                 tv = get_initializer_tarval_value(initializer);
1025                 break;
1026         case IR_INITIALIZER_CONST: {
1027                 ir_node *node = get_initializer_const_value(initializer);
1028                 if (!is_Const(node)) {
1029                         panic("bitfield initializer not a Const node");
1030                 }
1031                 tv = get_Const_tarval(node);
1032                 break;
1033         }
1034         case IR_INITIALIZER_COMPOUND:
1035                 panic("bitfield initializer is compound");
1036         }
1037         if (tv == NULL) {
1038                 panic("Couldn't get numeric value for bitfield initializer");
1039         }
1040         tv = tarval_convert_to(tv, get_type_mode(type));
1041
1042         /* normalize offset */
1043         vals        += offset_bits >> 3;
1044         offset_bits &= 7;
1045         value_len    = get_mode_size_bits(mode);
1046
1047         /* combine bits with existing bits */
1048         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
1049                 assert((size_t) (vals - glob_vals) + j < max_vals);
1050                 assert(vals[j].kind == BITFIELD ||
1051                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
1052                 vals[j].kind = BITFIELD;
1053                 curr_bits    = get_tarval_sub_bits(tv, j);
1054                 vals[j].v.bf_val
1055                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1056                 value_len -= 8;
1057                 last_bits = curr_bits;
1058         }
1059 }
1060
1061 static void emit_ir_initializer(normal_or_bitfield *vals,
1062                                 const ir_initializer_t *initializer,
1063                                 ir_type *type)
1064 {
1065         assert((size_t) (vals - glob_vals) < max_vals);
1066
1067         switch (get_initializer_kind(initializer)) {
1068         case IR_INITIALIZER_NULL:
1069                 return;
1070         case IR_INITIALIZER_TARVAL: {
1071                 size_t i;
1072
1073                 assert(vals->kind != BITFIELD);
1074                 vals->kind     = TARVAL;
1075                 vals->v.tarval = get_initializer_tarval_value(initializer);
1076                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
1077                 for (i = 1; i < get_type_size_bytes(type); ++i) {
1078                         vals[i].kind    = NORMAL;
1079                         vals[i].v.value = NULL;
1080                 }
1081                 return;
1082         }
1083         case IR_INITIALIZER_CONST: {
1084                 size_t i;
1085
1086                 assert(vals->kind != BITFIELD);
1087                 vals->kind    = NORMAL;
1088                 vals->v.value = get_initializer_const_value(initializer);
1089                 for (i = 1; i < get_type_size_bytes(type); ++i) {
1090                         vals[i].kind    = NORMAL;
1091                         vals[i].v.value = NULL;
1092                 }
1093                 return;
1094         }
1095         case IR_INITIALIZER_COMPOUND: {
1096                 size_t i = 0;
1097                 size_t n = get_initializer_compound_n_entries(initializer);
1098
1099                 if (is_Array_type(type)) {
1100                         ir_type *element_type = get_array_element_type(type);
1101                         size_t   skip         = get_type_size_bytes(element_type);
1102                         size_t   alignment    = get_type_alignment_bytes(element_type);
1103                         size_t   misalign     = skip % alignment;
1104                         if (misalign != 0) {
1105                                 skip += alignment - misalign;
1106                         }
1107
1108                         for (i = 0; i < n; ++i) {
1109                                 ir_initializer_t *sub_initializer
1110                                         = get_initializer_compound_value(initializer, i);
1111
1112                                 emit_ir_initializer(vals, sub_initializer, element_type);
1113
1114                                 vals += skip;
1115                         }
1116                 } else {
1117                         size_t n_members, i;
1118                         assert(is_compound_type(type));
1119                         n_members = get_compound_n_members(type);
1120                         for (i = 0; i < n_members; ++i) {
1121                                 ir_entity        *member    = get_compound_member(type, i);
1122                                 size_t            offset    = get_entity_offset(member);
1123                                 ir_type          *subtype   = get_entity_type(member);
1124                                 ir_mode          *mode      = get_type_mode(subtype);
1125                                 ir_initializer_t *sub_initializer;
1126
1127                                 assert(i < get_initializer_compound_n_entries(initializer));
1128                                 sub_initializer
1129                                         = get_initializer_compound_value(initializer, i);
1130
1131                                 if (mode != NULL) {
1132                                         size_t offset_bits
1133                                                 = get_entity_offset_bits_remainder(member);
1134                                         size_t value_len   = get_mode_size_bits(mode);
1135
1136                                         if (offset_bits != 0 ||
1137                                                 (value_len != 8 && value_len != 16 && value_len != 32
1138                                                  && value_len != 64)) {
1139                                                 emit_bitfield(&vals[offset], offset_bits,
1140                                                               sub_initializer, subtype);
1141                                                 continue;
1142                                         }
1143                                 }
1144
1145                                 emit_ir_initializer(&vals[offset], sub_initializer, subtype);
1146                         }
1147                 }
1148
1149                 return;
1150         }
1151         }
1152         panic("invalid ir_initializer kind found");
1153 }
1154
1155 static void emit_initializer(be_gas_decl_env_t *env, const ir_entity *entity)
1156 {
1157         const ir_initializer_t *initializer = entity->initializer;
1158         ir_type                *type;
1159         normal_or_bitfield     *vals;
1160         size_t                  size;
1161         size_t                  k;
1162
1163         if (initializer_is_string_const(initializer)) {
1164                 emit_string_initializer(initializer);
1165                 return;
1166         }
1167
1168         type = get_entity_type(entity);
1169         size = get_initializer_size(initializer, type);
1170
1171         if (size == 0)
1172                 return;
1173
1174         /*
1175          * In the worst case, every initializer allocates one byte.
1176          * Moreover, initializer might be big, do not allocate on stack.
1177          */
1178         vals = XMALLOCNZ(normal_or_bitfield, size);
1179
1180 #ifndef NDEBUG
1181         glob_vals = vals;
1182         max_vals  = size;
1183 #endif
1184
1185         emit_ir_initializer(vals, initializer, type);
1186
1187         /* now write values sorted */
1188         for (k = 0; k < size; ) {
1189                 int space     = 0;
1190                 int elem_size = 1;
1191                 if (vals[k].kind == NORMAL) {
1192                         if (vals[k].v.value != NULL) {
1193                                 emit_atomic_init(env, vals[k].v.value);
1194                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
1195                         } else {
1196                                 elem_size = 0;
1197                         }
1198                 } else if (vals[k].kind == TARVAL) {
1199                         tarval *tv   = vals[k].v.tarval;
1200                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
1201
1202                         assert(tv != NULL);
1203
1204                         elem_size = size;
1205                         emit_size_type(size);
1206                         emit_arith_tarval(tv, size);
1207                         be_emit_char('\n');
1208                         be_emit_write_line();
1209                 } else {
1210                         assert(vals[k].kind == BITFIELD);
1211                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1212                         be_emit_write_line();
1213                 }
1214
1215                 k += elem_size;
1216                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1217                         ++space;
1218                         ++k;
1219                 }
1220
1221                 /* a gap */
1222                 if (space > 0) {
1223                         be_emit_irprintf("\t.space\t%d\n", space);
1224                         be_emit_write_line();
1225                 }
1226         }
1227         xfree(vals);
1228 }
1229
1230 static void emit_compound_graph_init(be_gas_decl_env_t *env,
1231                                      const ir_entity *ent)
1232 {
1233         normal_or_bitfield *vals;
1234         int i, j, n;
1235         unsigned k, last_ofs;
1236
1237         if (entity_is_string_const(ent)) {
1238                 emit_string_cst(ent);
1239                 return;
1240         }
1241
1242         n = get_compound_ent_n_values(ent);
1243
1244         /* Find the initializer size. Sorrily gcc support a nasty feature:
1245            The last field of a compound may be a flexible array. This allows
1246            initializers bigger than the type size. */
1247         last_ofs = get_type_size_bytes(get_entity_type(ent));
1248         for (i = 0; i < n; ++i) {
1249                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1250                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1251                 ir_node  *value         = get_compound_ent_value(ent, i);
1252                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1253
1254                 offset += (value_len + bits_remainder + 7) >> 3;
1255
1256                 if (offset > last_ofs) {
1257                         last_ofs = offset;
1258                 }
1259         }
1260
1261         /*
1262          * In the worst case, every initializer allocates one byte.
1263          * Moreover, initializer might be big, do not allocate on stack.
1264          */
1265         vals = XMALLOCNZ(normal_or_bitfield, last_ofs);
1266
1267         /* collect the values and store them at the offsets */
1268         for (i = 0; i < n; ++i) {
1269                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1270                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1271                 ir_node  *value      = get_compound_ent_value(ent, i);
1272                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1273
1274                 assert(offset_bits >= 0);
1275
1276                 if (offset_bits != 0 ||
1277                                 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1278                         tarval *tv = get_atomic_init_tv(value);
1279                         unsigned char curr_bits, last_bits = 0;
1280                         if (tv == NULL) {
1281                                 panic("Couldn't get numeric value for bitfield initializer '%s'",
1282                                                 get_entity_ld_name(ent));
1283                         }
1284                         /* normalize offset */
1285                         offset += offset_bits >> 3;
1286                         offset_bits &= 7;
1287
1288                         for (j = 0; value_len + offset_bits > 0; ++j) {
1289                                 assert(offset + j < last_ofs);
1290                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1291                                 vals[offset + j].kind = BITFIELD;
1292                                 curr_bits = get_tarval_sub_bits(tv, j);
1293                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1294                                 value_len -= 8;
1295                                 last_bits = curr_bits;
1296                         }
1297                 } else {
1298                         int i;
1299
1300                         assert(offset < last_ofs);
1301                         assert(vals[offset].kind == NORMAL);
1302                         for (i = 1; i < value_len / 8; ++i) {
1303                                 assert(vals[offset + i].v.value == NULL);
1304                         }
1305                         vals[offset].v.value = value;
1306                 }
1307         }
1308
1309         /* now write them sorted */
1310         for (k = 0; k < last_ofs; ) {
1311                 int space = 0, skip = 0;
1312                 if (vals[k].kind == NORMAL) {
1313                         if (vals[k].v.value != NULL) {
1314                                 emit_atomic_init(env, vals[k].v.value);
1315                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1316                         } else {
1317                                 space = 1;
1318                         }
1319                 } else {
1320                         assert(vals[k].kind == BITFIELD);
1321                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1322                 }
1323
1324                 ++k;
1325                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1326                         ++space;
1327                         ++k;
1328                 }
1329                 space -= skip;
1330                 assert(space >= 0);
1331
1332                 /* a gap */
1333                 if (space > 0) {
1334                         be_emit_irprintf("\t.space\t%d\n", space);
1335                         be_emit_write_line();
1336                 }
1337         }
1338         xfree(vals);
1339 }
1340
1341 static void emit_align(unsigned p2alignment)
1342 {
1343         be_emit_irprintf("\t.p2align\t%u\n", log2_floor(p2alignment));
1344         be_emit_write_line();
1345 }
1346
1347 static unsigned get_effective_entity_alignment(const ir_entity *entity)
1348 {
1349         unsigned alignment = get_entity_alignment(entity);
1350         if (alignment == 0) {
1351                 ir_type *type = get_entity_type(entity);
1352                 alignment     = get_type_alignment_bytes(type);
1353         }
1354         return alignment;
1355 }
1356
1357 static void emit_common(const ir_entity *entity)
1358 {
1359         unsigned size      = get_type_size_bytes(get_entity_type(entity));
1360         unsigned alignment = get_effective_entity_alignment(entity);
1361
1362         if (get_entity_linkage(entity) & IR_LINKAGE_WEAK) {
1363                 emit_weak(entity);
1364         }
1365
1366         switch (be_gas_object_file_format) {
1367         case OBJECT_FILE_FORMAT_MACH_O:
1368                 be_emit_cstring("\t.comm ");
1369                 be_gas_emit_entity(entity);
1370                 be_emit_irprintf(",%u,%u\n", size, log2_floor(alignment));
1371                 be_emit_write_line();
1372                 return;
1373         case OBJECT_FILE_FORMAT_ELF:
1374         case OBJECT_FILE_FORMAT_ELF_SPARC:
1375                 be_emit_cstring("\t.comm ");
1376                 be_gas_emit_entity(entity);
1377                 be_emit_irprintf(",%u,%u\n", size, alignment);
1378                 be_emit_write_line();
1379                 return;
1380         case OBJECT_FILE_FORMAT_COFF:
1381                 be_emit_cstring("\t.comm ");
1382                 be_gas_emit_entity(entity);
1383                 be_emit_irprintf(",%u # %u\n", size, alignment);
1384                 be_emit_write_line();
1385                 return;
1386         }
1387         panic("invalid object file format");
1388 }
1389
1390 static void emit_local_common(const ir_entity *entity)
1391 {
1392         unsigned size      = get_type_size_bytes(get_entity_type(entity));
1393         unsigned alignment = get_effective_entity_alignment(entity);
1394
1395         if (get_entity_linkage(entity) & IR_LINKAGE_WEAK) {
1396                 emit_weak(entity);
1397         }
1398
1399         switch (be_gas_object_file_format) {
1400         case OBJECT_FILE_FORMAT_MACH_O:
1401                 be_emit_cstring("\t.lcomm ");
1402                 be_gas_emit_entity(entity);
1403                 be_emit_irprintf(",%u,%u\n", size, log2_floor(alignment));
1404                 be_emit_write_line();
1405                 return;
1406         case OBJECT_FILE_FORMAT_ELF:
1407         case OBJECT_FILE_FORMAT_ELF_SPARC:
1408                 be_emit_cstring("\t.local ");
1409                 be_gas_emit_entity(entity);
1410                 be_emit_cstring("\n");
1411                 be_emit_write_line();
1412                 be_emit_cstring("\t.comm ");
1413                 be_gas_emit_entity(entity);
1414                 be_emit_irprintf(",%u,%u\n", size, alignment);
1415                 be_emit_write_line();
1416                 return;
1417         case OBJECT_FILE_FORMAT_COFF:
1418                 be_emit_cstring("\t.lcomm ");
1419                 be_gas_emit_entity(entity);
1420                 be_emit_irprintf(",%u # %u\n", size, alignment);
1421                 be_emit_write_line();
1422                 return;
1423         }
1424         panic("invalid object file format");
1425 }
1426
1427 static void emit_indirect_symbol(const ir_entity *entity, be_gas_section_t section)
1428 {
1429         /* we can only do PIC code on macho so far */
1430         assert(be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O);
1431
1432         be_gas_emit_entity(entity);
1433         be_emit_cstring(":\n");
1434         be_emit_write_line();
1435         be_emit_cstring("\t.indirect_symbol ");
1436         be_emit_ident(get_entity_ident(entity));
1437         be_emit_char('\n');
1438         be_emit_write_line();
1439         if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1440                 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1441                 be_emit_write_line();
1442         } else {
1443                 assert(section == GAS_SECTION_PIC_SYMBOLS);
1444                 be_emit_cstring("\t.long 0\n");
1445                 be_emit_write_line();
1446         }
1447 }
1448
1449 char const *be_gas_get_private_prefix(void)
1450 {
1451         return be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O ? "L" : ".L";
1452 }
1453
1454 void be_gas_emit_entity(const ir_entity *entity)
1455 {
1456         if (entity->type == firm_code_type) {
1457                 ir_label_t label = get_entity_label(entity);
1458                 be_emit_irprintf("%s_%lu", be_gas_get_private_prefix(), label);
1459                 return;
1460         }
1461
1462         if (get_entity_visibility(entity) == ir_visibility_private) {
1463                 be_emit_string(be_gas_get_private_prefix());
1464         }
1465         be_emit_ident(get_entity_ld_ident(entity));
1466 }
1467
1468 void be_gas_emit_block_name(const ir_node *block)
1469 {
1470         if (has_Block_entity(block)) {
1471                 ir_entity *entity = get_Block_entity(block);
1472                 be_gas_emit_entity(entity);
1473         } else {
1474                 be_emit_irprintf("%s%ld", be_gas_get_private_prefix(), get_irn_node_nr(block));
1475         }
1476 }
1477
1478 /**
1479  * Dump a global entity.
1480  *
1481  * @param env  the gas output environment
1482  * @param ent  the entity to be dumped
1483  */
1484 static void emit_global(be_gas_decl_env_t *env, const ir_entity *entity)
1485 {
1486         ir_type          *type       = get_entity_type(entity);
1487         ident            *ld_ident   = get_entity_ld_ident(entity);
1488         unsigned          alignment  = get_effective_entity_alignment(entity);
1489         be_gas_section_t  section    = determine_section(env, entity);
1490         ir_visibility     visibility = get_entity_visibility(entity);
1491         ir_linkage        linkage    = get_entity_linkage(entity);
1492
1493         /* block labels are already emittet in the code */
1494         if (type == firm_code_type)
1495                 return;
1496
1497         /* we already emitted all methods. Except for the trampolines which
1498          * the assembler/linker generates */
1499         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1500                 /* functions with graph are already emitted with
1501                  * be_gas_emit_function_prolog */
1502                 if (get_entity_irg(entity) == NULL) {
1503                         emit_visibility(entity);
1504                 }
1505                 return;
1506         }
1507
1508         be_dbg_variable(entity);
1509
1510         if (section == GAS_SECTION_BSS) {
1511                 ir_visibility visibility = get_entity_visibility(entity);
1512
1513                 switch (visibility) {
1514                 case ir_visibility_local:
1515                 case ir_visibility_private:
1516                         emit_local_common(entity);
1517                         return;
1518                 case ir_visibility_default:
1519                         if (linkage & IR_LINKAGE_MERGE) {
1520                                 emit_common(entity);
1521                                 return;
1522                         }
1523                         break;
1524                 case ir_visibility_external:
1525                         if (linkage & IR_LINKAGE_MERGE)
1526                                 panic("merge link semantic not supported for extern entities");
1527                         break;
1528                 }
1529         }
1530
1531         emit_visibility(entity);
1532         if (visibility == ir_visibility_external) {
1533                 /* nothing to do for externally defined values */
1534                 return;
1535         }
1536
1537         if (!is_po2(alignment))
1538                 panic("alignment not a power of 2");
1539
1540         emit_section(section, entity);
1541
1542         if (section == GAS_SECTION_PIC_TRAMPOLINES
1543                         || section == GAS_SECTION_PIC_SYMBOLS) {
1544                 emit_indirect_symbol(entity, section);
1545                 return;
1546         }
1547
1548         /* alignment */
1549         if (alignment > 1) {
1550                 emit_align(alignment);
1551         }
1552         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_ELF
1553                         && be_gas_emit_types) {
1554                 be_emit_cstring("\t.type\t");
1555                 be_gas_emit_entity(entity);
1556                 be_emit_cstring(", ");
1557                 be_emit_char(be_gas_elf_type_char);
1558                 be_emit_cstring("object\n\t.size\t");\
1559                 be_gas_emit_entity(entity);
1560                 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1561         }
1562
1563         if (get_id_str(ld_ident)[0] != '\0') {
1564             be_gas_emit_entity(entity);
1565                 be_emit_cstring(":\n");
1566                 be_emit_write_line();
1567         }
1568
1569         if (entity_is_null(entity)) {
1570                 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1571                 be_emit_write_line();
1572         } else if (entity_has_compound_ent_values(entity)) {
1573                 emit_compound_graph_init(env, entity);
1574         } else {
1575                 assert(entity->initializer != NULL);
1576                 emit_initializer(env, entity);
1577         }
1578 }
1579
1580 /**
1581  * Dumps declarations of global variables and the initialization code.
1582  *
1583  * @param gt                a global like type, either the global or the TLS one
1584  * @param env               an environment
1585  */
1586 static void be_gas_emit_globals(ir_type *gt, be_gas_decl_env_t *env)
1587 {
1588         int i, n = get_compound_n_members(gt);
1589
1590         for (i = 0; i < n; i++) {
1591                 ir_entity *ent = get_compound_member(gt, i);
1592                 emit_global(env, ent);
1593         }
1594 }
1595
1596 /************************************************************************/
1597
1598 /* Generate all entities. */
1599 void be_gas_emit_decls(const be_main_env_t *main_env)
1600 {
1601         be_gas_decl_env_t env;
1602         memset(&env, 0, sizeof(env));
1603
1604         /* dump global type */
1605         env.main_env = main_env;
1606         env.section  = (be_gas_section_t) -1;
1607
1608         be_gas_emit_globals(get_glob_type(), &env);
1609         be_gas_emit_globals(get_tls_type(), &env);
1610         be_gas_emit_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env);
1611         be_gas_emit_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env);
1612         be_gas_emit_globals(main_env->pic_symbols_type, &env);
1613         be_gas_emit_globals(main_env->pic_trampolines_type, &env);
1614
1615         /**
1616          * ".subsections_via_symbols marks object files which are OK to divide
1617          * their section contents into individual blocks".
1618          * From my understanding this means no label points in the middle of an
1619          * object which we want to address as a whole. Firm code should be fine
1620          * with this.
1621          */
1622         if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
1623                 be_emit_cstring("\t.subsections_via_symbols\n");
1624                 be_emit_write_line();
1625         }
1626 }