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 #if 0
 355         case iro_Cast:
 356                 do_dump_atomic_init(env, get_Cast_op(init));
 357                 return;
 358
 359         case iro_Conv:
 360                 do_dump_atomic_init(env, get_Conv_op(init));
 361                 return;
 362 #endif
 363
 364         case iro_Const:
 365                 tv = get_Const_tarval(init);
 366
 367                 /* it's a arithmetic value */
 368                 dump_arith_tarval(tv, bytes);
 369                 return;
 370
 371         case iro_SymConst:
 372                 switch (get_SymConst_kind(init)) {
 373                 case symconst_addr_name:
 374                         be_emit_ident(get_SymConst_name(init));
 375                         break;
 376
 377                 case symconst_addr_ent:
 378                         ent = get_SymConst_entity(init);
 379                         if(!is_entity_backend_marked(ent)) {
 380                                 waitq_put(env->worklist, ent);
 381                                 set_entity_backend_marked(ent, 1);
 382                         }
 383                         be_emit_ident(get_entity_ld_ident(ent));
 384                         break;
 385
 386                 case symconst_ofs_ent:
 387                         ent = get_SymConst_entity(init);
 388 #if 0       /* not needed, is it? */
 389                         if(!is_entity_backend_marked(ent)) {
 390                                 waitq_put(env->worklist, ent);
 391                                 set_entity_backend_marked(ent, 1);
 392                         }
 393 #endif
 394                         be_emit_irprintf("%d", get_entity_offset(ent));
 395                         break;
 396
 397                 case symconst_type_size:
 398                         be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
 399                         break;
 400
 401                 case symconst_type_align:
 402                         be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
 403                         break;
 404
 405                 case symconst_enum_const:
 406                         tv = get_enumeration_value(get_SymConst_enum(init));
 407                         dump_arith_tarval(tv, bytes);
 408                         break;
 409
 410                 case symconst_label:
 411                         label = get_SymConst_label(init);
 412                         dump_label(label);
 413                         break;
 414
 415                 default:
 416                         assert(!"dump_atomic_init(): don't know how to init from this SymConst");
 417                 }
 418                 return;
 419
 420                 case iro_Add:
 421                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 422                                 panic("Constant must be int or pointer for '+' to work");
 423                         }
 424                         do_dump_atomic_init(env, get_Add_left(init));
 425                         be_emit_cstring(" + ");
 426                         do_dump_atomic_init(env, get_Add_right(init));
 427                         return;
 428
 429                 case iro_Sub:
 430                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 431                                 panic("Constant must be int or pointer for '-' to work");
 432                         }
 433                         do_dump_atomic_init(env, get_Sub_left(init));
 434                         be_emit_cstring(" - ");
 435                         do_dump_atomic_init(env, get_Sub_right(init));
 436                         return;
 437
 438                 case iro_Mul:
 439                         if (!mode_is_int(mode) && !mode_is_reference(mode)) {
 440                                 panic("Constant must be int or pointer for '*' to work");
 441                         }
 442                         do_dump_atomic_init(env, get_Mul_left(init));
 443                         be_emit_cstring(" * ");
 444                         do_dump_atomic_init(env, get_Mul_right(init));
 445                         return;
 446
 447                 default:
 448                         assert(0 && "dump_atomic_init(): unknown IR-node");
 449         }
 450 }
 451
 452 /**
 453  * Dumps the type for given size (.byte, .long, ...)
 454  *
 455  * @param size  the size in bytes
 456  */
 457 static void dump_size_type(size_t size) {
 458         switch (size) {
 459         case 1:
 460                 be_emit_cstring("\t.byte\t");
 461                 break;
 462
 463         case 2:
 464                 be_emit_cstring("\t.word\t");
 465                 break;
 466
 467         case 4:
 468                 be_emit_cstring("\t.long\t");
 469                 break;
 470
 471         case 8:
 472                 be_emit_cstring("\t.quad\t");
 473                 break;
 474
 475         case 10:
 476         case 12:
 477                 /* handled in arith */
 478                 break;
 479
 480         case 16:
 481                 be_emit_cstring("\t.octa\t");
 482                 break;
 483
 484         default:
 485                 panic("Try to dump a type with %u bytes\n", (unsigned) size);
 486         }
 487 }
 488
 489 /**
 490  * Emit an atomic value.
 491  *
 492  * @param env   the gas output environment
 493  * @param init  a node representing the atomic value (on the const code irg)
 494  */
 495 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
 496 {
 497         ir_mode *mode = get_irn_mode(init);
 498         int bytes     = get_mode_size_bytes(mode);
 499
 500         dump_size_type(bytes);
 501         do_dump_atomic_init(env, init);
 502         be_emit_char('\n');
 503         be_emit_write_line();
 504 }
 505
 506 /************************************************************************/
 507 /* Routines to dump global variables                                    */
 508 /************************************************************************/
 509
 510 static int initializer_is_string_const(const ir_initializer_t *initializer)
 511 {
 512         size_t i, len;
 513         int found_printable = 0;
 514
 515         if(initializer->kind != IR_INITIALIZER_COMPOUND)
 516                 return 0;
 517
 518         len = initializer->compound.n_initializers;
 519         if (len < 1)
 520                 return 0;
 521         for(i = 0; i < len; ++i) {
 522                 int               c;
 523                 tarval           *tv;
 524                 ir_mode          *mode;
 525                 ir_initializer_t *sub_initializer
 526                         = initializer->compound.initializers[i];
 527
 528                 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
 529                         return 0;
 530
 531                 tv   = sub_initializer->tarval.value;
 532                 mode = get_tarval_mode(tv);
 533
 534                 if (!mode_is_int(mode)
 535                                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 536                         return 0;
 537
 538                 c = get_tarval_long(tv);
 539                 if (isgraph(c) || isspace(c))
 540                         found_printable = 1;
 541                 else if(c != 0)
 542                         return 0;
 543
 544                 if (i == len - 1 && c != '\0')
 545                         return 0;
 546         }
 547
 548         return found_printable;
 549 }
 550
 551 /**
 552  * Determine if an entity is a string constant
 553  * @param ent The entity
 554  * @return 1 if it is a string constant, 0 otherwise
 555  */
 556 static int ent_is_string_const(ir_entity *ent)
 557 {
 558         ir_type *type, *element_type;
 559         ir_mode *mode;
 560         int i, c, n;
 561         int found_printable = 0;
 562
 563         type = get_entity_type(ent);
 564
 565         /* if it's an array */
 566         if (!is_Array_type(type))
 567                 return 0;
 568
 569         element_type = get_array_element_type(type);
 570
 571         /* and the array's element type is primitive */
 572         if (!is_Primitive_type(element_type))
 573                 return 0;
 574
 575         /* and the mode of the element type is an int of
 576          * the same size as the byte mode */
 577         mode = get_type_mode(element_type);
 578         if (!mode_is_int(mode)
 579                 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
 580                 return 0;
 581
 582         if(ent->has_initializer) {
 583                 /* TODO */
 584                 return 0;
 585         } else {
 586                 /* if it contains only printable chars and a 0 at the end */
 587                 n = get_compound_ent_n_values(ent);
 588                 for (i = 0; i < n; ++i) {
 589                         ir_node *irn = get_compound_ent_value(ent, i);
 590                         if (! is_Const(irn))
 591                                 return 0;
 592
 593                         c = (int) get_tarval_long(get_Const_tarval(irn));
 594
 595                         if (isgraph(c) || isspace(c))
 596                                 found_printable = 1;
 597                         else if(c != 0)
 598                                 return 0;
 599
 600                         if (i == n - 1 && c != '\0')
 601                                 return 0;
 602                 }
 603         }
 604
 605         /* then we can emit it as a string constant */
 606         return found_printable;
 607 }
 608
 609 /**
 610  * Dump a string constant.
 611  * No checks are made!!
 612  *
 613  * @param ent  The entity to dump.
 614  */
 615 static void dump_string_cst(ir_entity *ent)
 616 {
 617         int      i, len;
 618         ir_type *type;
 619         int      type_size;
 620         int      remaining_space;
 621
 622         len = get_compound_ent_n_values(ent);
 623         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 624                 be_emit_cstring("\t.ascii \"");
 625         } else {
 626                 be_emit_cstring("\t.string \"");
 627                 len -= 1;
 628         }
 629
 630         for (i = 0; i < len; ++i) {
 631                 ir_node *irn;
 632                 int c;
 633
 634                 irn = get_compound_ent_value(ent, i);
 635                 c = (int) get_tarval_long(get_Const_tarval(irn));
 636
 637                 switch (c) {
 638                 case '"' : be_emit_cstring("\\\""); break;
 639                 case '\n': be_emit_cstring("\\n"); break;
 640                 case '\r': be_emit_cstring("\\r"); break;
 641                 case '\t': be_emit_cstring("\\t"); break;
 642                 case '\\': be_emit_cstring("\\\\"); break;
 643                 default  :
 644                         if (isprint(c))
 645                                 be_emit_char(c);
 646                         else
 647                                 be_emit_irprintf("\\%o", c);
 648                         break;
 649                 }
 650         }
 651         be_emit_cstring("\"\n");
 652         be_emit_write_line();
 653
 654         type            = get_entity_type(ent);
 655         type_size       = get_type_size_bytes(type);
 656         remaining_space = type_size - len;
 657         assert(remaining_space >= 0);
 658         if(remaining_space > 0) {
 659                 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
 660         }
 661 }
 662
 663 static void dump_string_initializer(const ir_initializer_t *initializer)
 664 {
 665         size_t i, len;
 666
 667         len = initializer->compound.n_initializers;
 668         if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
 669                 be_emit_cstring("\t.ascii \"");
 670         } else {
 671                 be_emit_cstring("\t.string \"");
 672                 len -= 1;
 673         }
 674
 675         for(i = 0; i < len; ++i) {
 676                 const ir_initializer_t *sub_initializer
 677                         = get_initializer_compound_value(initializer, i);
 678
 679                 tarval *tv = get_initializer_tarval_value(sub_initializer);
 680                 int     c  = get_tarval_long(tv);
 681
 682                 switch (c) {
 683                 case '"' : be_emit_cstring("\\\""); break;
 684                 case '\n': be_emit_cstring("\\n"); break;
 685                 case '\r': be_emit_cstring("\\r"); break;
 686                 case '\t': be_emit_cstring("\\t"); break;
 687                 case '\\': be_emit_cstring("\\\\"); break;
 688                 default  :
 689                         if (isprint(c))
 690                                 be_emit_char(c);
 691                         else
 692                                 be_emit_irprintf("\\%o", c);
 693                         break;
 694                 }
 695         }
 696         be_emit_cstring("\"\n");
 697         be_emit_write_line();
 698 }
 699
 700 enum normal_or_bitfield_kind {
 701         NORMAL = 0,
 702         TARVAL,
 703         BITFIELD
 704 };
 705
 706 typedef struct {
 707         enum normal_or_bitfield_kind kind;
 708         union {
 709                 ir_node       *value;
 710                 tarval        *tarval;
 711                 unsigned char  bf_val;
 712         } v;
 713 } normal_or_bitfield;
 714
 715 static int is_type_variable_size(ir_type *type)
 716 {
 717         (void) type;
 718         /* TODO */
 719         return 0;
 720 }
 721
 722 static size_t get_initializer_size(const ir_initializer_t *initializer,
 723                                    ir_type *type)
 724 {
 725         switch(get_initializer_kind(initializer)) {
 726         case IR_INITIALIZER_TARVAL: {
 727                 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
 728                 return get_type_size_bytes(type);
 729         }
 730         case IR_INITIALIZER_CONST:
 731         case IR_INITIALIZER_NULL:
 732                 return get_type_size_bytes(type);
 733         case IR_INITIALIZER_COMPOUND: {
 734                 if(!is_type_variable_size(type)) {
 735                         return get_type_size_bytes(type);
 736                 } else {
 737                         unsigned n_entries
 738                                 = get_initializer_compound_n_entries(initializer);
 739                         unsigned i;
 740                         unsigned initializer_size = get_type_size_bytes(type);
 741                         for(i = 0; i < n_entries; ++i) {
 742                                 ir_entity *entity = get_compound_member(type, i);
 743                                 ir_type   *type   = get_entity_type(entity);
 744
 745                                 const ir_initializer_t *sub_initializer
 746                                         = get_initializer_compound_value(initializer, i);
 747
 748                                 unsigned offset = get_entity_offset(entity);
 749                                 unsigned size   = get_initializer_size(sub_initializer, type);
 750
 751                                 if(offset + size > initializer_size) {
 752                                         initializer_size = offset + size;
 753                                 }
 754                         }
 755                         return initializer_size;
 756                 }
 757         }
 758         }
 759
 760         panic("found invalid initializer");
 761 }
 762
 763 #ifndef NDEBUG
 764 static normal_or_bitfield *glob_vals;
 765 static size_t              max_vals;
 766 #endif
 767
 768 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
 769                           const ir_initializer_t *initializer, ir_type *type)
 770 {
 771         unsigned char  last_bits = 0;
 772         ir_mode       *mode      = get_type_mode(type);
 773         tarval        *tv        = NULL;
 774         unsigned char  curr_bits;
 775         int            value_len;
 776         int            j;
 777
 778         switch(get_initializer_kind(initializer)) {
 779         case IR_INITIALIZER_NULL:
 780                 return;
 781         case IR_INITIALIZER_TARVAL:
 782                 tv = get_initializer_tarval_value(initializer);
 783                 break;
 784         case IR_INITIALIZER_CONST: {
 785                 ir_node *node = get_initializer_const_value(initializer);
 786                 if(!is_Const(node)) {
 787                         panic("bitfield initializer not a Const node");
 788                 }
 789                 tv = get_Const_tarval(node);
 790                 break;
 791         }
 792         case IR_INITIALIZER_COMPOUND:
 793                 panic("bitfield initializer is compound");
 794         }
 795         if (tv == NULL) {
 796                 panic("Couldn't get numeric value for bitfield initializer\n");
 797         }
 798
 799         /* normalize offset */
 800         vals        += offset_bits >> 3;
 801         offset_bits &= 7;
 802         value_len    = get_mode_size_bits(mode);
 803
 804         /* combine bits with existing bits */
 805         for (j = 0; value_len + (int) offset_bits > 0; ++j) {
 806                 assert((size_t) (vals - glob_vals) + j < max_vals);
 807                 assert(vals[j].kind == BITFIELD ||
 808                                 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
 809                 vals[j].kind = BITFIELD;
 810                 curr_bits    = get_tarval_sub_bits(tv, j);
 811                 vals[j].v.bf_val
 812                         |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
 813                 value_len -= 8;
 814                 last_bits = curr_bits;
 815         }
 816 }
 817
 818 static void dump_ir_initializer(normal_or_bitfield *vals,
 819                                 const ir_initializer_t *initializer,
 820                                 ir_type *type)
 821 {
 822         assert((size_t) (vals - glob_vals) < max_vals);
 823
 824         switch(get_initializer_kind(initializer)) {
 825         case IR_INITIALIZER_NULL:
 826                 return;
 827         case IR_INITIALIZER_TARVAL: {
 828                 size_t i;
 829
 830                 assert(vals->kind != BITFIELD);
 831                 vals->kind     = TARVAL;
 832                 vals->v.tarval = get_initializer_tarval_value(initializer);
 833                 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
 834                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 835                         vals[i].kind    = NORMAL;
 836                         vals[i].v.value = NULL;
 837                 }
 838                 return;
 839         }
 840         case IR_INITIALIZER_CONST: {
 841                 size_t i;
 842
 843                 assert(vals->kind != BITFIELD);
 844                 vals->kind    = NORMAL;
 845                 vals->v.value = get_initializer_const_value(initializer);
 846                 for(i = 1; i < get_type_size_bytes(type); ++i) {
 847                         vals[i].kind    = NORMAL;
 848                         vals[i].v.value = NULL;
 849                 }
 850                 return;
 851         }
 852         case IR_INITIALIZER_COMPOUND: {
 853                 size_t i = 0;
 854                 size_t n = get_initializer_compound_n_entries(initializer);
 855
 856                 if(is_Array_type(type)) {
 857                         ir_type *element_type = get_array_element_type(type);
 858                         size_t   skip         = get_type_size_bytes(element_type);
 859                         size_t   alignment    = get_type_alignment_bytes(element_type);
 860                         size_t   misalign     = skip % alignment;
 861                         if(misalign != 0) {
 862                                 skip += alignment - misalign;
 863                         }
 864
 865                         for(i = 0; i < n; ++i) {
 866                                 ir_initializer_t *sub_initializer
 867                                         = get_initializer_compound_value(initializer, i);
 868
 869                                 dump_ir_initializer(vals, sub_initializer, element_type);
 870
 871                                 vals += skip;
 872                         }
 873                 } else {
 874                         size_t n_members, i;
 875                         assert(is_compound_type(type));
 876                         n_members = get_compound_n_members(type);
 877                         for(i = 0; i < n_members; ++i) {
 878                                 ir_entity        *member    = get_compound_member(type, i);
 879                                 size_t            offset    = get_entity_offset(member);
 880                                 ir_type          *subtype   = get_entity_type(member);
 881                                 ir_mode          *mode      = get_type_mode(subtype);
 882                                 ir_initializer_t *sub_initializer;
 883
 884                                 assert(i < get_initializer_compound_n_entries(initializer));
 885                                 sub_initializer
 886                                         = get_initializer_compound_value(initializer, i);
 887
 888                                 if(mode != NULL) {
 889                                         size_t offset_bits
 890                                                 = get_entity_offset_bits_remainder(member);
 891                                         size_t value_len   = get_mode_size_bits(mode);
 892
 893                                         if(offset_bits != 0 ||
 894                                                 (value_len != 8 && value_len != 16 && value_len != 32
 895                                                  && value_len != 64)) {
 896                                                 dump_bitfield(&vals[offset], offset_bits,
 897                                                               sub_initializer, subtype);
 898                                                 continue;
 899                                         }
 900                                 }
 901
 902                                 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
 903                         }
 904                 }
 905
 906                 return;
 907         }
 908         }
 909         panic("invalid ir_initializer kind found");
 910 }
 911
 912 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
 913 {
 914         const ir_initializer_t *initializer = entity->attr.initializer;
 915         ir_type                *type;
 916         normal_or_bitfield     *vals;
 917         size_t                  size;
 918         size_t                  k;
 919
 920         if(initializer_is_string_const(initializer)) {
 921                 dump_string_initializer(initializer);
 922                 return;
 923         }
 924
 925         type = get_entity_type(entity);
 926         size = get_initializer_size(initializer, type);
 927
 928         if (size == 0)
 929                 return;
 930
 931         /*
 932          * In the worst case, every initializer allocates one byte.
 933          * Moreover, initializer might be big, do not allocate on stack.
 934          */
 935         vals = xcalloc(size, sizeof(vals[0]));
 936
 937 #ifndef NDEBUG
 938         glob_vals = vals;
 939         max_vals  = size;
 940 #endif
 941
 942         dump_ir_initializer(vals, initializer, type);
 943
 944         /* now write values sorted */
 945         for (k = 0; k < size; ) {
 946                 int space     = 0;
 947                 int elem_size = 1;
 948                 if (vals[k].kind == NORMAL) {
 949                         if(vals[k].v.value != NULL) {
 950                                 dump_atomic_init(env, vals[k].v.value);
 951                                 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
 952                         } else {
 953                                 elem_size = 0;
 954                         }
 955                 } else if(vals[k].kind == TARVAL) {
 956                         tarval *tv   = vals[k].v.tarval;
 957                         size_t  size = get_mode_size_bytes(get_tarval_mode(tv));
 958
 959                         assert(tv != NULL);
 960
 961                         elem_size = size;
 962                         dump_size_type(size);
 963                         dump_arith_tarval(tv, size);
 964                         be_emit_char('\n');
 965                         be_emit_write_line();
 966                 } else {
 967                         assert(vals[k].kind == BITFIELD);
 968                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
 969                         be_emit_write_line();
 970                 }
 971
 972                 k += elem_size;
 973                 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
 974                         ++space;
 975                         ++k;
 976                 }
 977
 978                 /* a gap */
 979                 if (space > 0) {
 980                         be_emit_irprintf("\t.skip\t%d\n", space);
 981                         be_emit_write_line();
 982                 }
 983         }
 984         xfree(vals);
 985 }
 986
 987 /**
 988  * Dump an initializer for a compound entity.
 989  */
 990 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
 991 {
 992         normal_or_bitfield *vals;
 993         int i, j, n;
 994         unsigned k, last_ofs;
 995
 996         if(ent->has_initializer) {
 997                 dump_initializer(env, ent);
 998                 return;
 999         }
1000
1001         n = get_compound_ent_n_values(ent);
1002
1003         /* Find the initializer size. Sorrily gcc support a nasty feature:
1004            The last field of a compound may be a flexible array. This allows
1005            initializers bigger than the type size. */
1006         last_ofs = get_type_size_bytes(get_entity_type(ent));
1007         for (i = 0; i < n; ++i) {
1008                 unsigned offset         = get_compound_ent_value_offset_bytes(ent, i);
1009                 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1010                 ir_node  *value         = get_compound_ent_value(ent, i);
1011                 unsigned value_len      = get_mode_size_bits(get_irn_mode(value));
1012
1013                 offset += (value_len + bits_remainder + 7) >> 3;
1014
1015                 if (offset > last_ofs) {
1016                         last_ofs = offset;
1017                 }
1018         }
1019
1020         /*
1021          * In the worst case, every initializer allocates one byte.
1022          * Moreover, initializer might be big, do not allocate on stack.
1023          */
1024         vals = xcalloc(last_ofs, sizeof(vals[0]));
1025
1026         /* collect the values and store them at the offsets */
1027         for (i = 0; i < n; ++i) {
1028                 unsigned offset      = get_compound_ent_value_offset_bytes(ent, i);
1029                 int      offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1030                 ir_node  *value      = get_compound_ent_value(ent, i);
1031                 int      value_len   = get_mode_size_bits(get_irn_mode(value));
1032
1033                 assert(offset_bits >= 0);
1034
1035                 if (offset_bits != 0 ||
1036                         (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1037                         tarval *tv = get_atomic_init_tv(value);
1038                         unsigned char curr_bits, last_bits = 0;
1039                         if (tv == NULL) {
1040                                 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
1041                                       get_entity_ld_name(ent));
1042                         }
1043                         /* normalize offset */
1044                         offset += offset_bits >> 3;
1045                         offset_bits &= 7;
1046
1047                         for (j = 0; value_len + offset_bits > 0; ++j) {
1048                                 assert(offset + j < last_ofs);
1049                                 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1050                                 vals[offset + j].kind = BITFIELD;
1051                                 curr_bits = get_tarval_sub_bits(tv, j);
1052                                 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1053                                 value_len -= 8;
1054                                 last_bits = curr_bits;
1055                         }
1056                 } else {
1057                         int i;
1058
1059                         assert(offset < last_ofs);
1060                         assert(vals[offset].kind == NORMAL);
1061                         for (i = 1; i < value_len / 8; ++i) {
1062                                 assert(vals[offset + i].v.value == NULL);
1063                         }
1064                         vals[offset].v.value = value;
1065                 }
1066         }
1067
1068         /* now write them sorted */
1069         for (k = 0; k < last_ofs; ) {
1070                 int space = 0, skip = 0;
1071                 if (vals[k].kind == NORMAL) {
1072                         if(vals[k].v.value != NULL) {
1073                                 dump_atomic_init(env, vals[k].v.value);
1074                                 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1075                         } else {
1076                                 space = 1;
1077                         }
1078                 } else {
1079                         assert(vals[k].kind == BITFIELD);
1080                         be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1081                 }
1082
1083                 ++k;
1084                 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1085                         ++space;
1086                         ++k;
1087                 }
1088                 space -= skip;
1089                 assert(space >= 0);
1090
1091                 /* a gap */
1092                 if (space > 0) {
1093                         be_emit_irprintf("\t.skip\t%d\n", space);
1094                         be_emit_write_line();
1095                 }
1096         }
1097         xfree(vals);
1098 }
1099
1100 static void emit_align(unsigned alignment)
1101 {
1102         if (!is_po2(alignment))
1103                 panic("alignment not a power of 2");
1104
1105         be_emit_irprintf(".p2align\t%u\n", log2_floor(alignment));
1106         be_emit_write_line();
1107 }
1108
1109 /**
1110  * Dump a global entity.
1111  *
1112  * @param env           the gas output environment
1113  * @param ent           the entity to be dumped
1114  */
1115 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1116 {
1117         ir_type          *type           = get_entity_type(ent);
1118         ident            *ld_ident       = get_entity_ld_ident(ent);
1119         unsigned          align          = get_type_alignment_bytes(type);
1120         int               emit_as_common = 0;
1121         be_gas_section_t  section        = env->section;
1122         ir_variability    variability    = get_entity_variability(ent);
1123         ir_visibility     visibility     = get_entity_visibility(ent);
1124
1125         if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1126                 return;
1127         }
1128
1129         if (section != (be_gas_section_t) -1) {
1130                 emit_as_common = 0;
1131         } else if (variability == variability_constant) {
1132                 /* a constant entity, put it on the rdata */
1133                 section = GAS_SECTION_RODATA;
1134                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1135                                 && ent_is_string_const(ent)) {
1136                         section = GAS_SECTION_CSTRING;
1137                 }
1138         } else if (variability == variability_uninitialized) {
1139                 /* uninitialized entity put it in bss segment */
1140                 section = GAS_SECTION_COMMON;
1141                 if (visibility != visibility_local)
1142                         emit_as_common = 1;
1143         } else {
1144                 section = GAS_SECTION_DATA;
1145         }
1146
1147         if(!emit_as_common) {
1148                 be_gas_emit_switch_section(section);
1149         }
1150
1151         be_dbg_variable(ent);
1152
1153         /* global or not global */
1154         if (visibility == visibility_external_visible && !emit_as_common) {
1155                 be_emit_cstring(".globl\t");
1156                 be_emit_ident(ld_ident);
1157                 be_emit_char('\n');
1158                 be_emit_write_line();
1159         } else if(visibility == visibility_external_allocated) {
1160                 be_emit_cstring(".globl\t");
1161                 be_emit_ident(ld_ident);
1162                 be_emit_char('\n');
1163                 be_emit_write_line();
1164                 /* we can return now... */
1165                 return;
1166         }
1167         /* alignment */
1168         if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1169                         && section != GAS_SECTION_PIC_SYMBOLS) {
1170                 emit_align(align);
1171         }
1172
1173         if (!emit_as_common) {
1174                 be_emit_ident(ld_ident);
1175                 be_emit_cstring(":\n");
1176                 be_emit_write_line();
1177         }
1178
1179         if (variability == variability_uninitialized) {
1180                 if (emit_as_common) {
1181                         switch (be_gas_flavour) {
1182                         case GAS_FLAVOUR_ELF:
1183                         case GAS_FLAVOUR_MACH_O:
1184                         case GAS_FLAVOUR_YASM:
1185                                 be_emit_irprintf("\t.comm %s,%u,%u\n",
1186                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1187                                 be_emit_write_line();
1188                                 break;
1189                         case GAS_FLAVOUR_MINGW:
1190                                 be_emit_irprintf("\t.comm %s,%u # %u\n",
1191                                         get_id_str(ld_ident), get_type_size_bytes(type), align);
1192                                 be_emit_write_line();
1193                                 break;
1194                         }
1195                 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1196                         if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1197                                 be_emit_cstring("\t.indirect_symbol ");
1198                                 be_emit_ident(get_entity_ident(ent));
1199                                 be_emit_char('\n');
1200                                 be_emit_write_line();
1201                                 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1202                                 be_emit_write_line();
1203                         } else {
1204                                 panic("PIC trampolines not yet supported in this gas mode");
1205                         }
1206                 } else {
1207                         be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1208                         be_emit_write_line();
1209                 }
1210         } else {
1211                 if (is_atomic_entity(ent)) {
1212                         dump_atomic_init(env, get_atomic_ent_value(ent));
1213                 } else {
1214                         /* sort_compound_ent_values(ent); */
1215
1216                         switch (get_type_tpop_code(get_entity_type(ent))) {
1217                         case tpo_array:
1218                                 if (ent_is_string_const(ent))
1219                                         dump_string_cst(ent);
1220                                 else
1221                                         dump_compound_init(env, ent);
1222                                 break;
1223                         case tpo_struct:
1224                         case tpo_class:
1225                         case tpo_union:
1226                                 dump_compound_init(env, ent);
1227                                 break;
1228                         default:
1229                                 assert(0);
1230                         }
1231                 }
1232         }
1233 }
1234
1235 /**
1236  * Dumps declarations of global variables and the initialization code.
1237  *
1238  * @param gt                a global like type, either the global or the TLS one
1239  * @param env               an environment
1240  * @param only_emit_marked  if non-zero, external allocated entities that do not have
1241  *                          its visited flag set are ignored
1242  */
1243 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1244                                 int only_emit_marked)
1245 {
1246         int i, n = get_compound_n_members(gt);
1247         waitq *worklist = new_waitq();
1248
1249         if (only_emit_marked) {
1250                 for (i = 0; i < n; i++) {
1251                         ir_entity *ent = get_compound_member(gt, i);
1252                         if (is_entity_backend_marked(ent) ||
1253                             get_entity_visibility(ent) != visibility_external_allocated) {
1254                                 waitq_put(worklist, ent);
1255                                 set_entity_backend_marked(ent, 1);
1256                         }
1257                 }
1258         } else {
1259                 for (i = 0; i < n; i++) {
1260                         ir_entity *ent = get_compound_member(gt, i);
1261                         set_entity_backend_marked(ent, 1);
1262                         waitq_put(worklist, ent);
1263                 }
1264         }
1265
1266         env->worklist = worklist;
1267
1268         while (!waitq_empty(worklist)) {
1269                 ir_entity *ent = waitq_get(worklist);
1270
1271                 dump_global(env, ent);
1272         }
1273
1274         del_waitq(worklist);
1275         env->worklist = NULL;
1276 }
1277
1278 /************************************************************************/
1279
1280 /* Generate all entities. */
1281 void be_gas_emit_decls(const be_main_env_t *main_env,
1282                        int only_emit_marked_entities)
1283 {
1284         be_gas_decl_env_t env;
1285         memset(&env, 0, sizeof(env));
1286
1287         env.main_env = main_env;
1288
1289         /* dump global type */
1290         env.section = (be_gas_section_t) -1;
1291         be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1292         env.section = GAS_SECTION_TLS;
1293         be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1294         env.section = GAS_SECTION_CTOR;
1295         be_gas_dump_globals(get_constructors_type(), &env,
1296                             only_emit_marked_entities);
1297         env.section = GAS_SECTION_PIC_SYMBOLS;
1298         be_gas_dump_globals(main_env->pic_symbols_type, &env,
1299                             only_emit_marked_entities);
1300
1301         if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1302                 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1303                 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1304                                     only_emit_marked_entities);
1305                 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1306                         be_emit_cstring("\t.subsections_via_symbols\n");
1307                         be_emit_write_line();
1308                 }
1309         }
1310 }