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 #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 "entity_t.h"
  44 #include "error.h"
  45
  46 #include "be_t.h"
  47 #include "beemitter.h"
  48 #include "be_dbgout.h"
  49
  50 /** by default, we generate assembler code for the Linux gas */
  51 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_ELF;
  52
  53 static be_gas_section_t current_section = (be_gas_section_t) -1;
  54
  55 /**
  56  * Return the pseudo-instruction to be issued for a section switch
  57  * depending on the current flavour.
  58  *
  59  * @param section  the section to switch to
  60  *
  61  * @return  the pseudo-instruction
  62  */
  63 static const char *get_section_name(be_gas_section_t section) {
  64         static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
  65                 { /* GAS_FLAVOUR_ELF */
  66                         ".section\t.text",
  67                         ".section\t.data",
  68                         ".section\t.rodata",
  69                         ".section\t.bss",
  70                         ".section\t.tbss,\"awT\",@nobits",
  71                         ".section\t.ctors,\"aw\",@progbits",
  72                         NULL, /* no cstring section */
  73                         NULL,
  74                         NULL
  75                 },
  76                 { /* GAS_FLAVOUR_MINGW */
  77                         ".section\t.text",
  78                         ".section\t.data",
  79                         ".section .rdata,\"dr\"",
  80                         ".section\t.bss",
  81                         ".section\t.tbss,\"awT\",@nobits",
  82                         ".section\t.ctors,\"aw\",@progbits",
  83                         NULL,
  84                         NULL,
  85                         NULL
  86                 },
  87                 { /* GAS_FLAVOUR_YASM */
  88                         ".section\t.text",
  89                         ".section\t.data",
  90                         ".section\t.rodata",
  91                         ".section\t.bss",
  92                         ".section\t.tbss,\"awT\",@nobits",
  93                         ".section\t.ctors,\"aw\",@progbits",
  94                         NULL,
  95                         NULL,
  96                         NULL
  97                 },
  98                 { /* GAS_FLAVOUR_MACH_O */
  99                         ".text",
 100                         ".data",
 101                         ".const",
 102                         ".data",
 103                         NULL,             /* TLS is not supported on Mach-O */
 104                         ".mod_init_func",
 105                         ".cstring",
 106                         ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
 107                         ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
 108                 }
 109         };
 110
 111         assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
 112         assert((int) section >= 0 && section <= GAS_SECTION_LAST);
 113         return text[be_gas_flavour][section];
 114 }
 115
 116 void be_gas_emit_switch_section(be_gas_section_t section) {
 117         if(current_section == section)
 118                 return;
 119
 120         be_emit_char('\t');
 121         be_emit_string(get_section_name(section));
 122         be_emit_char('\n');
 123         be_emit_write_line();
 124         current_section = section;
 125 }
 126
 127 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
 128 {
 129         const char *name = get_entity_ld_name(entity);
 130         const char *fill_byte = "";
 131         unsigned maximum_skip;
 132
 133         be_gas_emit_switch_section(GAS_SECTION_TEXT);
 134
 135         /* write the begin line (used by scripts processing the assembler... */
 136         be_emit_write_line();
 137         be_emit_cstring("# -- Begin  ");
 138         be_emit_string(name);
 139         be_emit_char('\n');
 140         be_emit_write_line();
 141
 142         /* gcc fills space between function with 0x90, no idea if this is needed */
 143         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 144                 fill_byte = "0x90";
 145         }
 146
 147         if (alignment > 0) {
 148                 maximum_skip = (1 << alignment) - 1;
 149                 be_emit_cstring("\t.p2align ");
 150                 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
 151                 be_emit_write_line();
 152         }
 153         if (get_entity_visibility(entity) == visibility_external_visible) {
 154                 be_emit_cstring(".globl ");
 155                 be_emit_string(name);
 156                 be_emit_char('\n');
 157                 be_emit_write_line();
 158         }
 159
 160         switch (be_gas_flavour) {
 161         case GAS_FLAVOUR_ELF:
 162                 be_emit_cstring("\t.type\t");
 163                 be_emit_string(name);
 164                 be_emit_cstring(", @function\n");
 165                 be_emit_write_line();
 166                 break;
 167         case GAS_FLAVOUR_MINGW:
 168                 be_emit_cstring("\t.def\t");
 169                 be_emit_string(name);
 170                 be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
 171                 be_emit_write_line();
 172                 break;
 173         case GAS_FLAVOUR_MACH_O:
 174         case GAS_FLAVOUR_YASM:
 175                 break;
 176         }
 177         be_emit_string(name);
 178         be_emit_cstring(":\n");
 179         be_emit_write_line();
 180 }
 181
 182 void be_gas_emit_function_epilog(ir_entity *entity)
 183 {
 184         const char *name = get_entity_ld_name(entity);
 185
 186         if (be_gas_flavour == GAS_FLAVOUR_ELF) {
 187                 be_emit_cstring("\t.size\t");
 188                 be_emit_string(name);
 189                 be_emit_cstring(", .-");
 190                 be_emit_string(name);
 191                 be_emit_char('\n');
 192                 be_emit_write_line();
 193         }
 194
 195         be_emit_cstring("# -- End  ");
 196         be_emit_string(name);
 197         be_emit_char('\n');
 198         be_emit_write_line();
 199 }
 200
 201 /**
 202  * An environment containing all needed dumper data.
 203  * Currently we create the file completely in memory first, then
 204  * write it to the disk. This is an artifact from the old C-generating backend
 205  * and even there NOT needed. So we might change it in the future.
 206  */
 207 typedef struct _be_gas_decl_env {
 208         const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
 209         be_gas_section_t     section;
 210         waitq               *worklist;           /**< A worklist we use to place not yet handled entities on. */
 211 } be_gas_decl_env_t;
 212
 213 /************************************************************************/
 214
 215 /**
 216  * Output a tarval.
 217  *
 218  * @param tv     the tarval
 219  * @param bytes  the width of the tarvals value in bytes
 220  */
 221 static void dump_arith_tarval(tarval *tv, int bytes)
 222 {
 223         switch (bytes) {
 224         case 1:
 225                 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
 226                 return;
 227
 228         case 2:
 229                 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 230                 return;
 231
 232         case 4:
 233                 be_emit_irprintf("0x%02x%02x%02x%02x",
 234                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 235                 return;
 236
 237         case 8:
 238                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
 239                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 240                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 241                 return;
 242
 243         case 12:
 244                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
 245                                    "%02x%02x%02x%02x", get_tarval_sub_bits(tv, 11),
 246                                 get_tarval_sub_bits(tv, 10), get_tarval_sub_bits(tv, 9),
 247                                 get_tarval_sub_bits(tv, 8), get_tarval_sub_bits(tv, 7),
 248                                 get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5),
 249                                 get_tarval_sub_bits(tv, 4), get_tarval_sub_bits(tv, 3),
 250                                 get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1),
 251                                 get_tarval_sub_bits(tv, 0));
 252                 return;
 253
 254         case 16:
 255                 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
 256                                                "%02x%02x%02x%02x%02x%02x%02x%02x",
 257                         get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
 258                         get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
 259                         get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
 260                         get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
 261                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
 262                         get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 263                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
 264                         get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 265                 return;
 266         }
 267
 268         panic("Can't dump a tarval with %d bytes\n", bytes);
 269 }
 270
 271 /**
 272  * Return the label prefix for labeled blocks.
 273  */
 274 const char *be_gas_label_prefix(void) {
 275         return ".LG";
 276 }
 277
 278 /**
 279  * Dump a label.
 280  */
 281 static void dump_label(ir_label_t label) {
 282         be_emit_irprintf("%s%ld", be_gas_label_prefix(), label);
 283 }
 284
 285 /**
 286  * Return the tarval of an atomic initializer.
 287  *
 288  * @param init  a node representing the initializer (on the const code irg)
 289  *
 290  * @return the tarval
 291  */
 292 static tarval *get_atomic_init_tv(ir_node *init)
 293 {
 294         for (;;) {
 295                 ir_mode *mode = get_irn_mode(init);
 296
 297                 switch (get_irn_opcode(init)) {
 298
 299                 case iro_Cast:
 300                         init = get_Cast_op(init);
 301                         continue;
 302
 303                 case iro_Conv:
 304                         init = get_Conv_op(init);
 305                         continue;
 306
 307                 case iro_Const:
 308                         return get_Const_tarval(init);
 309
 310                 case iro_SymConst:
 311                         switch (get_SymConst_kind(init)) {
 312                         case symconst_type_size:
 313                                 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
 314
 315                         case symconst_type_align:
 316                                 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
 317
 318                         case symconst_ofs_ent:
 319                                 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
 320
 321                         case symconst_enum_const:
 322                                 return get_enumeration_value(get_SymConst_enum(init));
 323
 324                         case symconst_label:
 325                                 return NULL;
 326
 327                         default:
 328                                 return NULL;
 329                         }
 330
 331                 default:
 332                         return NULL;
 333                 }
 334         }
 335 }
 336
 337 /**
 338  * Dump an atomic value.
 339  *
 340  * @param env   the gas output environment
 341  * @param init  a node representing the atomic value (on the const code irg)
 342  */
 343 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 344 {
 345         ir_mode *mode = get_irn_mode(init);
 346         int bytes     = get_mode_size_bytes(mode);
 347         tarval *tv;
 348         ir_label_t label;
 349         ir_entity *ent;
 350
 351         init = skip_Id(init);
 352
 353         switch (get_irn_opcode(init)) {
 354         case iro_Cast:
 355                 do_dump_atomic_init(env, get_Cast_op(init));
 356                 return;
 357
 358         case iro_Conv:
 359                 do_dump_atomic_init(env, get_Conv_op(init));
 360                 return;
 361
 362         case iro_Const:
 363                 tv = get_Const_tarval(init);
 364
 365                 /* it's a arithmetic value */
 366                 dump_arith_tarval(tv, bytes);
 367                 return;
 368
 369         case iro_SymConst:
 370                 switch (get_SymConst_kind(init)) {
 371                 case symconst_addr_name:
 372                         be_emit_ident(get_SymConst_name(init));
 373                         break;
 374
 375                 case symconst_addr_ent:
 376                         ent = get_SymConst_entity(init);
 377                         if(!is_entity_backend_marked(ent)) {
 378                                 waitq_put(env->worklist, ent);
 379                                 set_entity_backend_marked(ent, 1);
 380                         }
 381                         be_emit_ident(get_entity_ld_ident(ent));
 382                         break;
 383
 384                 case symconst_ofs_ent:
 385                         ent = get_SymConst_entity(init);
 386 #if 0       /* not needed, is it? */
 387                         if(!is_entity_backend_marked(ent)) {
 388                                 waitq_put(env->worklist, ent);
 389                                 set_entity_backend_marked(ent, 1);
 390                         }
 391 #endif
 392                         be_emit_irprintf("%d", get_entity_offset(ent));
 393                         break;
 394
 395                 case symconst_type_size:
 396                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 397                         break;
 398
 399                 case symconst_type_align:
 400                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 401                         break;
 402
 403                 case symconst_enum_const:
 404                         tv = get_enumeration_value(get_SymConst_enum(init));
 405                         dump_arith_tarval(tv, bytes);
 406                         break;
 407
 408                 case symconst_label:
 409                         label = get_SymConst_label(init);
 410                         dump_label(label);
 411                         break;
 412
 413                 default:
 414                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 415                 }
 416                 return;
 417
 418                 case iro_Add:
 419                         do_dump_atomic_init(env, get_Add_left(init));
 420                         be_emit_cstring(" + ");
 421                         do_dump_atomic_init(env, get_Add_right(init));
 422                         return;
 423
 424                 case iro_Sub:
 425                         do_dump_atomic_init(env, get_Sub_left(init));
 426                         be_emit_cstring(" - ");
 427                         do_dump_atomic_init(env, get_Sub_right(init));
 428                         return;
 429
 430                 case iro_Mul:
 431                         do_dump_atomic_init(env, get_Mul_left(init));
 432                         be_emit_cstring(" * ");
 433                         do_dump_atomic_init(env, get_Mul_right(init));
 434                         return;
 435
 436                 default:
 437                         assert(0 && "dump_atomic_init(): unknown IR-node");
 438         }
 439 }
 440
 441 /**
 442  * Dumps the type for given size (.byte, .long, ...)
 443  *
 444  * @param size  the size in bytes
 445  */
 446 static void dump_size_type(size_t size) {
 447         switch (size) {
 448         case 1:
 449                 be_emit_cstring("\t.byte\t");
 450                 break;
 451
 452         case 2:
 453                 be_emit_cstring("\t.word\t");
 454                 break;
 455
 456         case 4:
 457                 be_emit_cstring("\t.long\t");
 458                 break;
 459
 460         case 8:
 461                 be_emit_cstring("\t.quad\t");
 462                 break;
 463
 464         case 10:
 465         case 12:
 466                 /* handled in arith */
 467                 break;
 468
 469         case 16:
 470                 be_emit_cstring("\t.octa\t");
 471                 break;
 472
 473         default:
 474                 panic("Try to dump a type with %u bytes\n", (unsigned) size);
 475         }
 476 }
 477
 478 /**
 479  * Emit an atomic value.
 480  *
 481  * @param env   the gas output environment
 482  * @param init  a node representing the atomic value (on the const code irg)
 483  */
 484 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 485 {
 486         ir_mode *mode = get_irn_mode(init);
 487         int bytes     = get_mode_size_bytes(mode);
 488
 489         dump_size_type(bytes);
 490         do_dump_atomic_init(env, init);
 491         be_emit_char('\n');
 492         be_emit_write_line();
 493 }
 494
 495 /************************************************************************/
 496 /* Routines to dump global variables                                    */
 497 /************************************************************************/
 498
 499 static int initializer_is_string_const(const ir_initializer_t *initializer)
 500 {
 501         size_t i, len;
 502         int found_printable = 0;
 503
 504         if(initializer->kind != IR_INITIALIZER_COMPOUND)
 505                 return 0;
 506
 507         len = initializer->compound.n_initializers;
 508         if (len < 1)
 509                 return 0;
 510         for(i = 0; i < len; ++i) {
 511                 int               c;
 512                 tarval           *tv;
 513                 ir_mode          *mode;
 514                 ir_initializer_t *sub_initializer
 515                         = initializer->compound.initializers[i];
 516
 517                 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
 518                         return 0;
 519
 520                 tv   = sub_initializer->tarval.value;
 521                 mode = get_tarval_mode(tv);
 522
 523                 if (!mode_is_int(mode)
 524                                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 525                         return 0;
 526
 527                 c = get_tarval_long(tv);
 528                 if (isgraph(c) || isspace(c))
 529                         found_printable = 1;
 530                 else if(c != 0)
 531                         return 0;
 532
 533                 if (i == len - 1 && c != '\0')
 534                         return 0;
 535         }
 536
 537         return found_printable;
 538 }
 539
 540 /**
 541  * Determine if an entity is a string constant
 542  * @param ent The entity
 543  * @return 1 if it is a string constant, 0 otherwise
 544  */
 545 static int ent_is_string_const(ir_entity *ent)
 546 {
 547         ir_type *type, *element_type;
 548         ir_mode *mode;
 549         int i, c, n;
 550         int found_printable = 0;
 551
 552         type = get_entity_type(ent);
 553
 554         /* if it's an array */
 555         if (!is_Array_type(type))
 556                 return 0;
 557
 558         element_type = get_array_element_type(type);
 559
 560         /* and the array's element type is primitive */
 561         if (!is_Primitive_type(element_type))
 562                 return 0;
 563
 564         /* and the mode of the element type is an int of
 565          * the same size as the byte mode */
 566         mode = get_type_mode(element_type);
 567         if (!mode_is_int(mode)
 568                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 569                 return 0;
 570
 571         if(ent->has_initializer) {
 572                 /* TODO */
 573                 return 0;
 574         } else {
 575                 /* if it contains only printable chars and a 0 at the end */
 576                 n = get_compound_ent_n_values(ent);
 577                 for (i = 0; i < n; ++i) {
 578                         ir_node *irn = get_compound_ent_value(ent, i);
 579                         if (! is_Const(irn))
 580                                 return 0;
 581
 582                         c = (int) get_tarval_long(get_Const_tarval(irn));
 583
 584                         if (isgraph(c) || isspace(c))
 585                                 found_printable = 1;
 586                         else if(c != 0)
 587                                 return 0;
 588
 589                         if (i == n - 1 && c != '\0')
 590                                 return 0;
 591                 }
 592         }
 593
 594         /* then we can emit it as a string constant */
 595         return found_printable;
 596 }
 597
 598 /**
 599  * Dump a string constant.
 600  * No checks are made!!
 601  *
 602  * @param ent  The entity to dump.
 603  */
 604 static void dump_string_cst(ir_entity *ent)
 605 {
 606         int      i, len;
 607         ir_type *type;
 608         int      type_size;
 609         int      remaining_space;
 610
 611         len = get_compound_ent_n_values(ent);
 612         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 613                 be_emit_cstring("\t.ascii \"");
 614         } else {
 615                 be_emit_cstring("\t.string \"");
 616                 len -= 1;
 617         }
 618
 619         for (i = 0; i < len; ++i) {
 620                 ir_node *irn;
 621                 int c;
 622
 623                 irn = get_compound_ent_value(ent, i);
 624                 c = (int) get_tarval_long(get_Const_tarval(irn));
 625
 626                 switch (c) {
 627                 case '"' : be_emit_cstring("\\\""); break;
 628                 case '\n': be_emit_cstring("\\n"); break;
 629                 case '\r': be_emit_cstring("\\r"); break;
 630                 case '\t': be_emit_cstring("\\t"); break;
 631                 case '\\': be_emit_cstring("\\\\"); break;
 632                 default  :
 633                         if (isprint(c))
 634                                 be_emit_char(c);
 635                         else
 636                                 be_emit_irprintf("\\%o", c);
 637                         break;
 638                 }
 639         }
 640         be_emit_cstring("\"\n");
 641         be_emit_write_line();
 642
 643         type            = get_entity_type(ent);
 644         type_size       = get_type_size_bytes(type);
 645         remaining_space = type_size - len;
 646         assert(remaining_space >= 0);
 647         if(remaining_space > 0) {
 648                 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
 649         }
 650 }
 651
 652 static void dump_string_initializer(const ir_initializer_t *initializer)
 653 {
 654         size_t i, len;
 655
 656         len = initializer->compound.n_initializers;
 657         if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 658                 be_emit_cstring("\t.ascii \"");
 659         } else {
 660                 be_emit_cstring("\t.string \"");
 661                 len -= 1;
 662         }
 663
 664         for(i = 0; i < len; ++i) {
 665                 const ir_initializer_t *sub_initializer
 666                         = get_initializer_compound_value(initializer, i);
 667
 668                 tarval *tv = get_initializer_tarval_value(sub_initializer);
 669                 int     c  = get_tarval_long(tv);
 670
 671                 switch (c) {
 672                 case '"' : be_emit_cstring("\\\""); break;
 673                 case '\n': be_emit_cstring("\\n"); break;
 674                 case '\r': be_emit_cstring("\\r"); break;
 675                 case '\t': be_emit_cstring("\\t"); break;
 676                 case '\\': be_emit_cstring("\\\\"); break;
 677                 default  :
 678                         if (isprint(c))
 679                                 be_emit_char(c);
 680                         else
 681                                 be_emit_irprintf("\\%o", c);
 682                         break;
 683                 }
 684         }
 685         be_emit_cstring("\"\n");
 686         be_emit_write_line();
 687 }
 688
 689 enum normal_or_bitfield_kind {
 690         NORMAL = 0,
 691         TARVAL,
 692         BITFIELD
 693 };
 694
 695 typedef struct {
 696         enum normal_or_bitfield_kind kind;
 697         union {
 698                 ir_node       *value;
 699                 tarval        *tarval;
 700                 unsigned char  bf_val;
 701         } v;
 702 } normal_or_bitfield;
 703
 704 static int is_type_variable_size(ir_type *type)
 705 {
 706         (void) type;
 707         /* TODO */
 708         return 0;
 709 }
 710
 711 static size_t get_initializer_size(const ir_initializer_t *initializer,
 712                                    ir_type *type)
 713 {
 714         switch(get_initializer_kind(initializer)) {
 715         case IR_INITIALIZER_TARVAL: {
 716                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 717                 return get_type_size_bytes(type);
 718         }
 719         case IR_INITIALIZER_CONST:
 720         case IR_INITIALIZER_NULL:
 721                 return get_type_size_bytes(type);
 722         case IR_INITIALIZER_COMPOUND: {
 723                 if(!is_type_variable_size(type)) {
 724                         return get_type_size_bytes(type);
 725                 } else {
 726                         unsigned n_entries
 727                                 = get_initializer_compound_n_entries(initializer);
 728                         unsigned i;
 729                         unsigned initializer_size = get_type_size_bytes(type);
 730                         for(i = 0; i < n_entries; ++i) {
 731                                 ir_entity *entity = get_compound_member(type, i);
 732                                 ir_type   *type   = get_entity_type(entity);
 733
 734                                 const ir_initializer_t *sub_initializer
 735                                         = get_initializer_compound_value(initializer, i);
 736
 737                                 unsigned offset = get_entity_offset(entity);
 738                                 unsigned size   = get_initializer_size(sub_initializer, type);
 739
 740                                 if(offset + size > initializer_size) {
 741                                         initializer_size = offset + size;
 742                                 }
 743                         }
 744                         return initializer_size;
 745                 }
 746         }
 747         }
 748
 749         panic("found invalid initializer");
 750 }
 751
 752 #ifndef NDEBUG
 753 static normal_or_bitfield *glob_vals;
 754 static size_t              max_vals;
 755 #endif
 756
 757 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
 758                           const ir_initializer_t *initializer, ir_type *type)
 759 {
 760         unsigned char  last_bits = 0;
 761         ir_mode       *mode      = get_type_mode(type);
 762         tarval        *tv        = NULL;
 763         unsigned char  curr_bits;
 764         int            value_len;
 765         int            j;
 766
 767         switch(get_initializer_kind(initializer)) {
 768         case IR_INITIALIZER_NULL:
 769                 return;
 770         case IR_INITIALIZER_TARVAL:
 771                 tv = get_initializer_tarval_value(initializer);
 772                 break;
 773         case IR_INITIALIZER_CONST: {
 774                 ir_node *node = get_initializer_const_value(initializer);
 775                 if(!is_Const(node)) {
 776                         panic("bitfield initializer not a Const node");
 777                 }
 778                 tv = get_Const_tarval(node);
 779                 break;
 780         }
 781         case IR_INITIALIZER_COMPOUND:
 782                 panic("bitfield initializer is compound");
 783         }
 784         if (tv == NULL) {
 785                 panic("Couldn't get numeric value for bitfield initializer\n");
 786         }
 787
 788         /* normalize offset */
 789         vals        += offset_bits >> 3;
 790         offset_bits &= 7;
 791         value_len    = get_mode_size_bits(mode);
 792
 793         /* combine bits with existing bits */
 794         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 795                 assert((size_t) (vals - glob_vals) + j < max_vals);
 796                 assert(vals[j].kind == BITFIELD ||
 797                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 798                 vals[j].kind = BITFIELD;
 799                 curr_bits    = get_tarval_sub_bits(tv, j);
 800                 vals[j].v.bf_val
 801                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 802                 value_len -= 8;
 803                 last_bits = curr_bits;
 804         }
 805 }
 806
 807 static void dump_ir_initializer(normal_or_bitfield *vals,
 808                                 const ir_initializer_t *initializer,
 809                                 ir_type *type)
 810 {
 811         assert((size_t) (vals - glob_vals) < max_vals);
 812
 813         switch(get_initializer_kind(initializer)) {
 814         case IR_INITIALIZER_NULL:
 815                 return;
 816         case IR_INITIALIZER_TARVAL: {
 817                 size_t i;
 818
 819                 assert(vals->kind != BITFIELD);
 820                 vals->kind     = TARVAL;
 821                 vals->v.tarval = get_initializer_tarval_value(initializer);
 822                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 823                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 824                         vals[i].kind    = NORMAL;
 825                         vals[i].v.value = NULL;
 826                 }
 827                 return;
 828         }
 829         case IR_INITIALIZER_CONST: {
 830                 size_t i;
 831
 832                 assert(vals->kind != BITFIELD);
 833                 vals->kind    = NORMAL;
 834                 vals->v.value = get_initializer_const_value(initializer);
 835                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 836                         vals[i].kind    = NORMAL;
 837                         vals[i].v.value = NULL;
 838                 }
 839                 return;
 840         }
 841         case IR_INITIALIZER_COMPOUND: {
 842                 size_t i = 0;
 843                 size_t n = get_initializer_compound_n_entries(initializer);
 844
 845                 if(is_Array_type(type)) {
 846                         ir_type *element_type = get_array_element_type(type);
 847                         size_t   skip         = get_type_size_bytes(element_type);
 848                         size_t   alignment    = get_type_alignment_bytes(element_type);
 849                         size_t   misalign     = skip % alignment;
 850                         if(misalign != 0) {
 851                                 skip += alignment - misalign;
 852                         }
 853
 854                         for(i = 0; i < n; ++i) {
 855                                 ir_initializer_t *sub_initializer
 856                                         = get_initializer_compound_value(initializer, i);
 857
 858                                 dump_ir_initializer(vals, sub_initializer, element_type);
 859
 860                                 vals += skip;
 861                         }
 862                 } else {
 863                         size_t n_members, i;
 864                         assert(is_compound_type(type));
 865                         n_members = get_compound_n_members(type);
 866                         for(i = 0; i < n_members; ++i) {
 867                                 ir_entity        *member    = get_compound_member(type, i);
 868                                 size_t            offset    = get_entity_offset(member);
 869                                 ir_type          *subtype   = get_entity_type(member);
 870                                 ir_mode          *mode      = get_type_mode(subtype);
 871                                 ir_initializer_t *sub_initializer;
 872
 873                                 assert(i < get_initializer_compound_n_entries(initializer));
 874                                 sub_initializer
 875                                         = get_initializer_compound_value(initializer, i);
 876
 877                                 if(mode != NULL) {
 878                                         size_t offset_bits
 879                                                 = get_entity_offset_bits_remainder(member);
 880                                         size_t value_len   = get_mode_size_bits(mode);
 881
 882                                         if(offset_bits != 0 ||
 883                                                 (value_len != 8 && value_len != 16 && value_len != 32
 884                                                  && value_len != 64)) {
 885                                                 dump_bitfield(&vals[offset], offset_bits,
 886                                                               sub_initializer, subtype);
 887                                                 continue;
 888                                         }
 889                                 }
 890
 891                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 892                         }
 893                 }
 894
 895                 return;
 896         }
 897         }
 898         panic("invalid ir_initializer kind found");
 899 }
 900
 901 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 902 {
 903         const ir_initializer_t *initializer = entity->attr.initializer;
 904         ir_type                *type;
 905         normal_or_bitfield     *vals;
 906         size_t                  size;
 907         size_t                  k;
 908
 909         if(initializer_is_string_const(initializer)) {
 910                 dump_string_initializer(initializer);
 911                 return;
 912         }
 913
 914         type = get_entity_type(entity);
 915         size = get_initializer_size(initializer, type);
 916
 917         if (size == 0)
 918                 return;
 919
 920         /*
 921          * In the worst case, every initializer allocates one byte.
 922          * Moreover, initializer might be big, do not allocate on stack.
 923          */
 924         vals = xcalloc(size, sizeof(vals[0]));
 925
 926 #ifndef NDEBUG
 927         glob_vals = vals;
 928         max_vals  = size;
 929 #endif
 930
 931         dump_ir_initializer(vals, initializer, type);
 932
 933         /* now write values sorted */
 934         for (k = 0; k < size; ) {
 935                 int space = 0, skip = 0;
 936                 if (vals[k].kind == NORMAL) {
 937                         if(vals[k].v.value != NULL) {
 938                                 dump_atomic_init(env, vals[k].v.value);
 939                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
 940                         } else {
 941                                 space = 1;
 942                         }
 943                 } else if(vals[k].kind == TARVAL) {
 944                         tarval *tv   = vals[k].v.tarval;
 945                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 946
 947                         assert(tv != NULL);
 948
 949                         skip = size - 1;
 950                         dump_size_type(size);
 951                         dump_arith_tarval(tv, size);
 952                         be_emit_char('\n');
 953                         be_emit_write_line();
 954                 } else {
 955                         assert(vals[k].kind == BITFIELD);
 956                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 957                         be_emit_write_line();
 958                 }
 959
 960                 ++k;
 961                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 962                         ++space;
 963                         ++k;
 964                 }
 965                 space -= skip;
 966                 assert(space >= 0);
 967
 968                 /* a gap */
 969                 if (space > 0) {
 970                         be_emit_irprintf("\t.skip\t%d\n", space);
 971                         be_emit_write_line();
 972                 }
 973         }
 974         xfree(vals);
 975 }
 976
 977 /**
 978  * Dump an initializer for a compound entity.
 979  */
 980 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
 981 {
 982         normal_or_bitfield *vals;
 983         int i, j, n;
 984         unsigned k, last_ofs;
 985
 986         if(ent->has_initializer) {
 987                 dump_initializer(env, ent);
 988                 return;
 989         }
 990
 991         n = get_compound_ent_n_values(ent);
 992
 993         /* Find the initializer size. Sorrily gcc support a nasty feature:
 994            The last field of a compound may be a flexible array. This allows
 995            initializers bigger than the type size. */
 996         last_ofs = get_type_size_bytes(get_entity_type(ent));
 997         for (i = 0; i < n; ++i) {
 998                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
 999                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1000                 ir_node  *value         = get_compound_ent_value(ent, i);
1001                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1002
1003                 offset += (value_len + bits_remainder + 7) >> 3;
1004
1005                 if (offset > last_ofs) {
1006                         last_ofs = offset;
1007                 }
1008         }
1009
1010         /*
1011          * In the worst case, every initializer allocates one byte.
1012          * Moreover, initializer might be big, do not allocate on stack.
1013          */
1014         vals = xcalloc(last_ofs, sizeof(vals[0]));
1015
1016         /* collect the values and store them at the offsets */
1017         for (i = 0; i < n; ++i) {
1018                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1019                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1020                 ir_node  *value      = get_compound_ent_value(ent, i);
1021                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1022
1023                 assert(offset_bits >= 0);
1024
1025                 if (offset_bits != 0 ||
1026                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1027                         tarval *tv = get_atomic_init_tv(value);
1028                         unsigned char curr_bits, last_bits = 0;
1029                         if (tv == NULL) {
1030                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
1031                                       get_entity_ld_name(ent));
1032                         }
1033                         /* normalize offset */
1034                         offset += offset_bits >> 3;
1035                         offset_bits &= 7;
1036
1037                         for (j = 0; value_len + offset_bits > 0; ++j) {
1038                                 assert(offset + j < last_ofs);
1039                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1040                                 vals[offset + j].kind = BITFIELD;
1041                                 curr_bits = get_tarval_sub_bits(tv, j);
1042                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1043                                 value_len -= 8;
1044                                 last_bits = curr_bits;
1045                         }
1046                 } else {
1047                         int i;
1048
1049                         assert(offset < last_ofs);
1050                         assert(vals[offset].kind == NORMAL);
1051                         for (i = 1; i < value_len / 8; ++i) {
1052                                 assert(vals[offset + i].v.value == NULL);
1053                         }
1054                         vals[offset].v.value = value;
1055                 }
1056         }
1057
1058         /* now write them sorted */
1059         for (k = 0; k < last_ofs; ) {
1060                 int space = 0, skip = 0;
1061                 if (vals[k].kind == NORMAL) {
1062                         if(vals[k].v.value != NULL) {
1063                                 dump_atomic_init(env, vals[k].v.value);
1064                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1065                         } else {
1066                                 space = 1;
1067                         }
1068                 } else {
1069                         assert(vals[k].kind == BITFIELD);
1070                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1071                 }
1072
1073                 ++k;
1074                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1075                         ++space;
1076                         ++k;
1077                 }
1078                 space -= skip;
1079                 assert(space >= 0);
1080
1081                 /* a gap */
1082                 if (space > 0) {
1083                         be_emit_irprintf("\t.skip\t%d\n", space);
1084                         be_emit_write_line();
1085                 }
1086         }
1087         xfree(vals);
1088 }
1089
1090 static void emit_align(unsigned alignment)
1091 {
1092         if (!is_po2(alignment))
1093                 panic("alignment not a power of 2");
1094
1095         be_emit_irprintf(".p2align\t%u\n", log2_floor(alignment));
1096         be_emit_write_line();
1097 }
1098
1099 /**
1100  * Dump a global entity.
1101  *
1102  * @param env           the gas output environment
1103  * @param ent           the entity to be dumped
1104  */
1105 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1106 {
1107         ir_type          *type           = get_entity_type(ent);
1108         ident            *ld_ident       = get_entity_ld_ident(ent);
1109         unsigned          align          = get_type_alignment_bytes(type);
1110         int               emit_as_common = 0;
1111         be_gas_section_t  section        = env->section;
1112         ir_variability    variability    = get_entity_variability(ent);
1113         ir_visibility     visibility     = get_entity_visibility(ent);
1114
1115         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1116                 return;
1117         }
1118
1119         if (section != (be_gas_section_t) -1) {
1120                 emit_as_common = 0;
1121         } else if (variability == variability_constant) {
1122                 /* a constant entity, put it on the rdata */
1123                 section = GAS_SECTION_RODATA;
1124                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1125                                 && ent_is_string_const(ent)) {
1126                         section = GAS_SECTION_CSTRING;
1127                 }
1128         } else if (variability == variability_uninitialized) {
1129                 /* uninitialized entity put it in bss segment */
1130                 section = GAS_SECTION_COMMON;
1131                 if (visibility != visibility_local)
1132                         emit_as_common = 1;
1133         } else {
1134                 section = GAS_SECTION_DATA;
1135         }
1136
1137         if(!emit_as_common) {
1138                 be_gas_emit_switch_section(section);
1139         }
1140
1141         be_dbg_variable(ent);
1142
1143         /* global or not global */
1144         if (visibility == visibility_external_visible && !emit_as_common) {
1145                 be_emit_cstring(".globl\t");
1146                 be_emit_ident(ld_ident);
1147                 be_emit_char('\n');
1148                 be_emit_write_line();
1149         } else if(visibility == visibility_external_allocated) {
1150                 be_emit_cstring(".globl\t");
1151                 be_emit_ident(ld_ident);
1152                 be_emit_char('\n');
1153                 be_emit_write_line();
1154                 /* we can return now... */
1155                 return;
1156         }
1157         /* alignment */
1158         if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1159                         && section != GAS_SECTION_PIC_SYMBOLS) {
1160                 emit_align(align);
1161         }
1162
1163         if (!emit_as_common) {
1164                 be_emit_ident(ld_ident);
1165                 be_emit_cstring(":\n");
1166                 be_emit_write_line();
1167         }
1168
1169         if (variability == variability_uninitialized) {
1170                 if (emit_as_common) {
1171                         switch (be_gas_flavour) {
1172                         case GAS_FLAVOUR_ELF:
1173                         case GAS_FLAVOUR_MACH_O:
1174                         case GAS_FLAVOUR_YASM:
1175                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1176                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1177                                 be_emit_write_line();
1178                                 break;
1179                         case GAS_FLAVOUR_MINGW:
1180                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1181                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1182                                 be_emit_write_line();
1183                                 break;
1184                         }
1185                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1186                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1187                                 be_emit_cstring("\t.indirect_symbol ");
1188                                 be_emit_ident(get_entity_ident(ent));
1189                                 be_emit_char('\n');
1190                                 be_emit_write_line();
1191                                 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1192                                 be_emit_write_line();
1193                         } else {
1194                                 panic("PIC trampolines not yet supported in this gas mode");
1195                         }
1196                 } else {
1197                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1198                         be_emit_write_line();
1199                 }
1200         } else {
1201                 if (is_atomic_entity(ent)) {
1202                         dump_atomic_init(env, get_atomic_ent_value(ent));
1203                 } else {
1204                         /* sort_compound_ent_values(ent); */
1205
1206                         switch (get_type_tpop_code(get_entity_type(ent))) {
1207                         case tpo_array:
1208                                 if (ent_is_string_const(ent))
1209                                         dump_string_cst(ent);
1210                                 else
1211                                         dump_compound_init(env, ent);
1212                                 break;
1213                         case tpo_struct:
1214                         case tpo_class:
1215                         case tpo_union:
1216                                 dump_compound_init(env, ent);
1217                                 break;
1218                         default:
1219                                 assert(0);
1220                         }
1221                 }
1222         }
1223 }
1224
1225 /**
1226  * Dumps declarations of global variables and the initialization code.
1227  *
1228  * @param gt                a global like type, either the global or the TLS one
1229  * @param env               an environment
1230  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1231  *                          its visited flag set are ignored
1232  */
1233 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1234                                 int only_emit_marked)
1235 {
1236         int i, n = get_compound_n_members(gt);
1237         waitq *worklist = new_waitq();
1238
1239         if (only_emit_marked) {
1240                 for (i = 0; i < n; i++) {
1241                         ir_entity *ent = get_compound_member(gt, i);
1242                         if (is_entity_backend_marked(ent) ||
1243                             get_entity_visibility(ent) != visibility_external_allocated) {
1244                                 waitq_put(worklist, ent);
1245                                 set_entity_backend_marked(ent, 1);
1246                         }
1247                 }
1248         } else {
1249                 for (i = 0; i < n; i++) {
1250                         ir_entity *ent = get_compound_member(gt, i);
1251                         set_entity_backend_marked(ent, 1);
1252                         waitq_put(worklist, ent);
1253                 }
1254         }
1255
1256         env->worklist = worklist;
1257
1258         while (!waitq_empty(worklist)) {
1259                 ir_entity *ent = waitq_get(worklist);
1260
1261                 dump_global(env, ent);
1262         }
1263
1264         del_waitq(worklist);
1265         env->worklist = NULL;
1266 }
1267
1268 /************************************************************************/
1269
1270 /* Generate all entities. */
1271 void be_gas_emit_decls(const be_main_env_t *main_env,
1272                        int only_emit_marked_entities)
1273 {
1274         be_gas_decl_env_t env;
1275         memset(&env, 0, sizeof(env));
1276
1277         env.main_env = main_env;
1278
1279         /* dump global type */
1280         env.section = (be_gas_section_t) -1;
1281         be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1282         env.section = GAS_SECTION_TLS;
1283         be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1284         env.section = GAS_SECTION_CTOR;
1285         be_gas_dump_globals(get_constructors_type(), &env,
1286                             only_emit_marked_entities);
1287         env.section = GAS_SECTION_PIC_SYMBOLS;
1288         be_gas_dump_globals(main_env->pic_symbols_type, &env,
1289                             only_emit_marked_entities);
1290
1291         if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1292                 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1293                 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1294                                     only_emit_marked_entities);
1295                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1296                         be_emit_cstring("\t.subsections_via_symbols\n");
1297                         be_emit_write_line();
1298                 }
1299         }
1300 }