nsz Git - libfirm/blob - ir/be/ia32/ia32_gen_decls.c

   1 /**
   2  * Dumps global variables and constants as ia32 assembler.
   3  * @author Christian Wuerdig
   4  * @date 04.11.2005
   5  * @version $Id$
   6  */
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <ctype.h>
  11 #include <assert.h>
  12
  13 #include "obst.h"
  14 #include "tv.h"
  15 #include "irnode.h"
  16 #include "entity.h"
  17 #include "irprog.h"
  18
  19 #include "../be.h"
  20
  21 #include "ia32_emitter.h"
  22 #include "ia32_gen_decls.h"
  23
  24 typedef struct obstack obstack_t;
  25
  26 typedef struct _ia32_decl_env {
  27         obstack_t *rodata_obst;
  28         obstack_t *data_obst;
  29         obstack_t *comm_obst;
  30         obstack_t *ctor_obst;
  31         const be_main_env_t *main_env;
  32 } ia32_decl_env_t;
  33
  34 /************************************************************************/
  35
  36 /*
  37  * returns the highest bit value
  38  */
  39 static unsigned highest_bit(unsigned v)
  40 {
  41         int res = -1;
  42
  43         if (v >= (1U << 16U)) {
  44                 res += 16;
  45                 v >>= 16;
  46         }
  47         if (v >= (1U << 8U)) {
  48                 res += 8;
  49                 v >>= 8;
  50         }
  51         if (v >= (1U << 4U)) {
  52                 res += 4;
  53                 v >>= 4;
  54         }
  55         if (v >= (1U << 2U)) {
  56                 res += 2;
  57                 v >>= 2;
  58         }
  59         if (v >= (1U << 1U)) {
  60                 res += 1;
  61                 v >>= 1;
  62         }
  63         if (v >= 1)
  64                 res += 1;
  65
  66         return res;
  67 }
  68
  69 static void ia32_dump_comm(obstack_t *obst, const char *name, visibility vis, int size, int align) {
  70         switch (asm_flavour) {
  71         case ASM_LINUX_GAS:
  72                 if (vis == visibility_local)
  73                         obstack_printf(obst, "\t.local\t%s\n", name);
  74                 obstack_printf(obst, "\t.comm\t%s,%d,%d\n", name, size, align);
  75                 break;
  76         case ASM_MINGW_GAS:
  77                 if (vis == visibility_local)
  78                         obstack_printf(obst, "\t.lcomm\t%s,%d\n", name, size);
  79                 else
  80                         obstack_printf(obst, "\t.comm\t%s,%d\n", name, size);
  81                 break;
  82         default:
  83                 break;
  84         }
  85 }
  86
  87 /**
  88  * output the alignment to an obstack
  89  */
  90 static void ia32_dump_align(obstack_t *obst, int align)
  91 {
  92         int h = highest_bit(align);
  93
  94         if ((1 << h) < align)
  95                 ++h;
  96         align = (1 << h);
  97
  98         if (align > 1)
  99                 obstack_printf(obst, "\t.align %d\n", align);
 100 }
 101
 102 /**
 103  * output the alignment to a FILE
 104  */
 105 static void ia32_dump_align_f(FILE *f, int align)
 106 {
 107         int h = highest_bit(align);
 108
 109         if ((1 << h) < align)
 110                 ++h;
 111         align = (1 << h);
 112
 113         if (align > 1)
 114                 fprintf(f, "\t.align %d\n", align);
 115 }
 116
 117 /**
 118  * output a tarval
 119  */
 120 static void dump_arith_tarval(obstack_t *obst, tarval *tv, int bytes)
 121 {
 122         switch (bytes) {
 123
 124         case 1:
 125                 obstack_printf(obst, "0x%02x", get_tarval_sub_bits(tv, 0));
 126                 break;
 127
 128         case 2:
 129                 obstack_printf(obst, "0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 130                 break;
 131
 132         case 4:
 133                 obstack_printf(obst, "0x%02x%02x%02x%02x",
 134                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 135                 break;
 136
 137         case 8:
 138                 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x",
 139                         get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
 140                         get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
 141                 break;
 142
 143         case 10:
 144         case 12:
 145                 break;
 146
 147         default:
 148                 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
 149                 assert(0);
 150         }
 151 }
 152
 153 /*
 154  * dump an atomic value
 155  */
 156 static void do_dump_atomic_init(obstack_t *obst, ir_node *init)
 157 {
 158         ir_mode *mode = get_irn_mode(init);
 159         int bytes     = get_mode_size_bytes(mode);
 160         tarval *tv;
 161
 162         switch (get_irn_opcode(init)) {
 163
 164         case iro_Cast:
 165                 do_dump_atomic_init(obst, get_Cast_op(init));
 166                 return;
 167
 168         case iro_Conv:
 169                 do_dump_atomic_init(obst, get_Conv_op(init));
 170                 return;
 171
 172         case iro_Const:
 173                 tv = get_Const_tarval(init);
 174
 175                 /* beware of old stuff */
 176                 //assert(! mode_is_reference(mode));
 177
 178                 /* it's a arithmetic value */
 179                 dump_arith_tarval(obst, tv, bytes);
 180                 return;
 181
 182         case iro_SymConst:
 183                 switch (get_SymConst_kind(init)) {
 184                 case symconst_addr_name:
 185                         obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
 186                         break;
 187
 188                 case symconst_addr_ent:
 189                         obstack_printf(obst, "%s", get_entity_ld_name(get_SymConst_entity(init)));
 190                         break;
 191
 192                 case symconst_type_size:
 193                         obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
 194                         break;
 195
 196                 case symconst_type_align:
 197                         obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
 198                         break;
 199
 200                 case symconst_enum_const:
 201                         tv = get_enumeration_value(get_SymConst_enum(init));
 202                         dump_arith_tarval(obst, tv, bytes);
 203                         break;
 204
 205                 default:
 206                         assert(0 && "dump_atomic_init(): don't know how to init from this SymConst");
 207                 }
 208                 return;
 209
 210                 case iro_Add:
 211                         do_dump_atomic_init(obst, get_Add_left(init));
 212                         obstack_printf(obst, " + ");
 213                         do_dump_atomic_init(obst, get_Add_right(init));
 214                         return;
 215
 216                 case iro_Sub:
 217                         do_dump_atomic_init(obst, get_Sub_left(init));
 218                         obstack_printf(obst, " - ");
 219                         do_dump_atomic_init(obst, get_Sub_right(init));
 220                         return;
 221
 222                 case iro_Mul:
 223                         do_dump_atomic_init(obst, get_Mul_left(init));
 224                         obstack_printf(obst, " * ");
 225                         do_dump_atomic_init(obst, get_Mul_right(init));
 226                         return;
 227
 228                 default:
 229                         assert(0 && "dump_atomic_init(): unknown IR-node");
 230         }
 231 }
 232
 233 /*
 234  * dumps the type for given size (.byte, .long, ...)
 235  */
 236 static void dump_size_type(obstack_t *obst, int size) {
 237         switch (size) {
 238
 239         case 1:
 240                 obstack_printf(obst, "\t.byte\t");
 241                 break;
 242
 243         case 2:
 244                 obstack_printf(obst, "\t.value\t");
 245                 break;
 246
 247         case 4:
 248                 obstack_printf(obst, "\t.long\t");
 249                 break;
 250
 251         case 8:
 252                 obstack_printf(obst, "\t.quad\t");
 253                 break;
 254
 255         case 10:
 256         case 12:
 257                 /* handled in arith */
 258                 break;
 259
 260         default:
 261                 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
 262                 assert(0);
 263         }
 264 }
 265
 266 /*
 267  * dump an atomic value
 268  */
 269 static void dump_atomic_init(obstack_t *obst, ir_node *init)
 270 {
 271         ir_mode *mode = get_irn_mode(init);
 272         int bytes     = get_mode_size_bytes(mode);
 273
 274         dump_size_type(obst, bytes);
 275         do_dump_atomic_init(obst, init);
 276         obstack_printf(obst, "\n");
 277 }
 278
 279 /************************************************************************/
 280 /* Routines to dump global variables                                    */
 281 /************************************************************************/
 282
 283 /**
 284  * Determine if an entity is a string constant
 285  * @param ent The entity
 286  * @return 1 if it is a string constant, 0 otherwise
 287  */
 288 static int ent_is_string_const(entity *ent)
 289 {
 290         int res = 0;
 291         ir_type *ty;
 292
 293         ty = get_entity_type(ent);
 294
 295         /* if it's an array */
 296         if (is_Array_type(ty)) {
 297                 ir_type *elm_ty = get_array_element_type(ty);
 298
 299                 /* and the array's element type is primitive */
 300                 if (is_Primitive_type(elm_ty)) {
 301                         ir_mode *mode = get_type_mode(elm_ty);
 302
 303                         /*
 304                         * and the mode of the element type is an int of
 305                         * the same size as the byte mode
 306                         */
 307                         if (mode_is_int(mode)
 308                                 && get_mode_size_bits(mode) == get_mode_size_bits(mode_Bs))
 309                         {
 310                                 int i, c, n;
 311
 312                                 n = get_compound_ent_n_values(ent);
 313                                 for (i = 0; i < n; ++i) {
 314                                         ir_node *irn = get_compound_ent_value(ent, i);
 315                                         if(get_irn_opcode(irn) != iro_Const)
 316                                                 return 0;
 317
 318                                         c = (int) get_tarval_long(get_Const_tarval(irn));
 319
 320                                         if((i < n - 1 && !(isgraph(c) || isspace(c)))
 321                                                 || (i == n - 1 && c != '\0'))
 322                                                 return 0;
 323                                 }
 324
 325                                 res = 1;
 326                         }
 327                 }
 328         }
 329
 330         return res;
 331 }
 332
 333 /**
 334  * Dump a atring constant.
 335  * No checks are made!!
 336  * @param obst The obst to dump on.
 337  * @param ent The entity to dump.
 338  */
 339 static void dump_string_cst(obstack_t *obst, entity *ent)
 340 {
 341         int i, n;
 342
 343         obstack_printf(obst, "\t.string \"");
 344         n = get_compound_ent_n_values(ent);
 345
 346         for (i = 0; i < n-1; ++i) {
 347                 ir_node *irn;
 348                 int c;
 349
 350                 irn = get_compound_ent_value(ent, i);
 351                 c = (int) get_tarval_long(get_Const_tarval(irn));
 352
 353                 switch (c) {
 354                 case '"' : obstack_printf(obst, "\\\""); break;
 355                 case '\n': obstack_printf(obst, "\\n"); break;
 356                 case '\r': obstack_printf(obst, "\\r"); break;
 357                 case '\t': obstack_printf(obst, "\\t"); break;
 358                 case '\\': obstack_printf(obst, "\\\\"); break;
 359                 default  :
 360                         if (isprint(c))
 361                                 obstack_printf(obst, "%c", c);
 362                         else
 363                                 obstack_printf(obst, "%O", c);
 364                         break;
 365                 }
 366         }
 367         obstack_printf(obst, "\"\n");
 368 }
 369
 370 struct arr_info {
 371         int n_elems;
 372         int visit_cnt;
 373         int size;
 374 };
 375
 376 /**
 377  * Dump the size of an object
 378  */
 379 static void dump_object_size(obstack_t *obst, const char *name, int size) {
 380         switch (asm_flavour) {
 381         case ASM_LINUX_GAS:
 382                 obstack_printf(obst, "\t.type\t%s,@object\n", name);
 383                 obstack_printf(obst, "\t.size\t%s,%d\n", name, size);
 384                 break;
 385         default:
 386                 break;
 387         }
 388 }
 389
 390 /*
 391  * Dumps the initialization of global variables that are not
 392  * "uninitialized".
 393  */
 394 static void dump_global(const be_main_env_t *main_env,
 395                                                 obstack_t *rdata_obstack, obstack_t *data_obstack,
 396                                                 obstack_t *comm_obstack, obstack_t *ctor_obstack,
 397                                                 entity *ent)
 398 {
 399         ir_type *ty         = get_entity_type(ent);
 400         const char *ld_name = get_entity_ld_name(ent);
 401         obstack_t *obst     = data_obstack;
 402         int align, h;
 403         const arch_env_t *arch_env = main_env->arch_env;
 404
 405         /*
 406          * FIXME: did NOT work for partly constant values
 407          */
 408         if (! is_Method_type(ty)) {
 409                 ent_variability variability = get_entity_variability(ent);
 410                 visibility visibility = get_entity_visibility(ent);
 411
 412                 if (variability == variability_constant) {
 413                         /* a constant entity, put it on the rdata */
 414                         obst = rdata_obstack;
 415                 }
 416
 417                 /* check, whether it is initialized, if yes create data */
 418                 if (variability != variability_uninitialized) {
 419                         be_dbg_global(main_env->db_handle, obst, ent);
 420
 421                         if (visibility == visibility_external_visible) {
 422                                 obstack_printf(obst, ".globl\t%s\n", ld_name);
 423                         }
 424                         dump_object_size(obst, ld_name, get_type_size_bytes(ty));
 425
 426                         align = get_type_alignment_bytes(ty);
 427                         ia32_dump_align(obst, align);
 428
 429                         obstack_printf(obst, "%s:\n", ld_name);
 430
 431                         if (is_atomic_type(ty)) {
 432                                 if (get_entity_visibility(ent) != visibility_external_allocated)
 433                                         dump_atomic_init(obst, get_atomic_ent_value(ent));
 434                         }
 435                         else {
 436                                 int i, size = 0;
 437
 438                                 if (ent_is_string_const(ent)) {
 439                                         dump_string_cst(obst, ent);
 440                                 }
 441                                 else if (is_Array_type(ty)) {
 442                                         int filler;
 443
 444                                         /* potential spare values should be already included! */
 445                                         for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
 446                                                 entity *step = get_compound_ent_value_member(ent, i);
 447                                                 ir_type *stype = get_entity_type(step);
 448
 449                                                 if (get_type_mode(stype)) {
 450                                                         int align = (get_type_alignment_bits(stype) + 7) >> 3;
 451                                                         int n     = size % align;
 452
 453                                                         if (n > 0) {
 454                                                                 obstack_printf(obst, "\t.zero\t%d\n", align - n);
 455                                                                 size += align - n;
 456                                                         }
 457                                                 }
 458                                                 dump_atomic_init(obst, get_compound_ent_value(ent, i));
 459                                                 size += get_type_size_bytes(stype);
 460                                         }
 461                                         filler = get_type_size_bytes(ty) - size;
 462
 463                                         if (filler > 0)
 464                                                 obstack_printf(obst, "\t.zero\t%d\n", filler);
 465                                 }
 466                                 else if (is_compound_type(ty)) {
 467                                         ir_node **vals;
 468                                         int type_size, j;
 469
 470                                         /* Compound entities are NOT sorted.
 471                                          * The sorting strategy used doesn't work for `value' compound fields nor
 472                                          * for partially_constant entities.
 473                                          */
 474
 475                                         /*
 476                                          * in the worst case, every entity allocates one byte, so the type
 477                                          * size should be equal or bigger the number of fields
 478                                          */
 479                                         type_size = get_type_size_bytes(ty);
 480                                         vals      = xcalloc(type_size, sizeof(*vals));
 481
 482                                         /* collect the values and store them at the offsets */
 483                                         for(i = 0; i < get_compound_ent_n_values(ent); ++i) {
 484                                                 int                 graph_length, aipos, offset;
 485                                                 struct arr_info     *ai;
 486                                                 int                 all_n = 1;
 487                                                 compound_graph_path *path = get_compound_ent_value_path(ent, i);
 488
 489                                                 /* get the access path to the costant value */
 490                                                 graph_length = get_compound_graph_path_length(path);
 491                                                 ai = xcalloc(graph_length, sizeof(struct arr_info));
 492
 493                                                 /* We wanna know how many arrays are on the path to the entity. We also have to know how
 494                                                  * many elements each array holds to calculate the offset for the entity. */
 495                                                 for (j = 0; j < graph_length; j++) {
 496                                                         entity  *step      = get_compound_graph_path_node(path, j);
 497                                                         ir_type *step_type = get_entity_type(step);
 498                                                         int     ty_size    = (get_type_size_bits(step_type) + 7) >> 3;
 499                                                         int     k, n       = 0;
 500
 501                                                         if (is_Array_type(step_type))
 502                                                                 for (k = 0; k < get_array_n_dimensions(step_type); k++)
 503                                                                         n += get_tarval_long(get_Const_tarval(get_array_upper_bound(step_type, k)));
 504                                                                 if (n) all_n *= n;
 505                                                                 ai[j].n_elems = n ? all_n + 1 : 0;
 506                                                                 ai[j].visit_cnt = 0;
 507                                                                 ai[j].size = ty_size;
 508                                                 }
 509
 510                                                 aipos = graph_length - 1;
 511                                                 if (aipos) aipos--;
 512
 513                                                 for (offset = j = 0; j < graph_length; j++) {
 514                                                         entity *step       = get_compound_graph_path_node(path, j);
 515                                                         ir_type *step_type = get_entity_type(step);
 516                                                         int ent_ofs        = get_entity_offset_bytes(step);
 517                                                         int stepsize       = 0;
 518
 519                                                         /* add all positive offsets (= offsets in structs) */
 520                                                         if (ent_ofs >= 0) offset += ent_ofs;
 521
 522                                                         if (j == graph_length - 1) {
 523                                                                 stepsize = (get_type_size_bits(step_type) + 7) >> 3;
 524
 525                                                                 /* Search the next free position in vals depending on the information from above (ai). */
 526                                                                 while (vals[offset] && aipos >= 0) {
 527                                                                         if (ai[aipos].visit_cnt < ai[aipos].n_elems) {
 528                                                                                 offset += stepsize;
 529                                                                                 ai[aipos].visit_cnt++;
 530                                                                         }
 531                                                                         else
 532                                                                                 while (aipos >= 0 && ai[aipos].visit_cnt == ai[aipos].n_elems) {
 533                                                                                         stepsize = ai[aipos--].size;
 534                                                                                         offset  += stepsize;
 535                                                                                 }
 536                                                                 }
 537
 538                                                                 assert(aipos >= 0 && "couldn't store entity");
 539                                                                 vals[offset] = get_compound_ent_value(ent, i);
 540                                                         }
 541                                                 }
 542
 543                                                 free(ai);
 544                                         }
 545
 546                                         /* now write them sorted */
 547                                         for(i = 0; i < type_size; ) {
 548                                                 if (vals[i]) {
 549                                                         dump_atomic_init(obst, vals[i]);
 550                                                         i += (get_mode_size_bytes(get_irn_mode(vals[i])));
 551                                                 }
 552                                                 else {
 553                                                         /* a gap */
 554                                                         obstack_printf(obst, "\t.byte\t0\n");
 555                                                         ++i;
 556                                                 }
 557                                         }
 558                                         free(vals);
 559                                 }
 560                                 else {
 561                                         assert(0 && "unsupported type");
 562                                 }
 563                         }
 564                         obstack_printf(obst, "\n");
 565                 }
 566                 else if (visibility != visibility_external_allocated) {
 567                         be_dbg_global(main_env->db_handle, comm_obstack, ent);
 568
 569                         /* uninitialized and NOT external */
 570                         if (get_entity_owner(ent) != get_tls_type()) {
 571                                 /* calculate the alignment */
 572                                 align = get_type_alignment_bytes(ty);
 573                                 h = highest_bit(align);
 574
 575                                 if ((1 << h) < align)
 576                                         ++h;
 577                                 align = (1 << h);
 578
 579                                 if (align < 1)
 580                                         align = 1;
 581
 582                                 ia32_dump_comm(comm_obstack, ld_name, visibility,
 583                                         get_type_size_bytes(ty), align);
 584                         } else {
 585                                 /* TLS */
 586                                 if (visibility == visibility_external_visible) {
 587                                         obstack_printf(comm_obstack, ".globl\t%s\n", ld_name);
 588                                 }
 589                                 dump_object_size(comm_obstack, ld_name, get_type_size_bytes(ty));
 590                                 align = get_type_alignment_bytes(ty);
 591                                 ia32_dump_align(comm_obstack, align);
 592                                 obstack_printf(comm_obstack, "%s:\n\t.zero %d\n", ld_name, get_type_size_bytes(ty));
 593                         }
 594                 }
 595         } /* ! is method type */
 596         else if (ctor_obstack && get_method_img_section(ent) == section_constructors) {
 597                 ia32_dump_align(ctor_obstack, get_type_alignment_bytes(ty));
 598                 dump_size_type(ctor_obstack, get_type_alignment_bytes(ty));
 599                 obstack_printf(ctor_obstack, "%s\n", ld_name);
 600         }
 601 }
 602
 603 /**
 604  * Dumps declarations of global variables and the initialization code.
 605  */
 606 static void ia32_dump_globals(ir_type *gt, ia32_decl_env_t *env)
 607 {
 608         int i, n = get_compound_n_members(gt);
 609
 610         for (i = 0; i < n; i++)
 611                 dump_global(env->main_env, env->rodata_obst, env->data_obst, env->comm_obst, env->ctor_obst,
 612                         get_compound_member(gt, i));
 613 }
 614
 615 /************************************************************************/
 616
 617 void ia32_gen_decls(FILE *out, const be_main_env_t *main_env) {
 618         ia32_decl_env_t env;
 619         obstack_t rodata, data, comm, ctor;
 620         int    size;
 621         char   *cp;
 622
 623         /* dump the global type */
 624         obstack_init(&rodata);
 625         obstack_init(&data);
 626         obstack_init(&comm);
 627
 628         if (main_env->options->opt_profile)
 629                 obstack_init(&ctor);
 630
 631         env.rodata_obst = &rodata;
 632         env.data_obst   = &data;
 633         env.comm_obst   = &comm;
 634         env.ctor_obst   = main_env->options->opt_profile ? &ctor : NULL;
 635         env.main_env    = main_env;
 636
 637         ia32_dump_globals(get_glob_type(), &env);
 638
 639         size = obstack_object_size(&data);
 640         cp   = obstack_finish(&data);
 641         if (size > 0) {
 642                 ia32_switch_section(out, SECTION_DATA);
 643                 fwrite(cp, 1, size, out);
 644         }
 645
 646         size = obstack_object_size(&rodata);
 647         cp   = obstack_finish(&rodata);
 648         if (size > 0) {
 649                 ia32_switch_section(out, SECTION_RODATA);
 650                 fwrite(cp, 1, size, out);
 651         }
 652
 653         size = obstack_object_size(&comm);
 654         cp   = obstack_finish(&comm);
 655         if (size > 0) {
 656                 ia32_switch_section(out, SECTION_COMMON);
 657                 fwrite(cp, 1, size, out);
 658         }
 659
 660         if (main_env->options->opt_profile) {
 661                 size = obstack_object_size(&ctor);
 662                 cp   = obstack_finish(&ctor);
 663                 if (size > 0) {
 664                         ia32_switch_section(out, SECTION_CTOR);
 665                         fwrite(cp, 1, size, out);
 666                 }
 667                 obstack_free(&ctor, NULL);
 668         }
 669
 670         obstack_free(&rodata, NULL);
 671         obstack_free(&data, NULL);
 672         obstack_free(&comm, NULL);
 673
 674         /* dump the Thread Local Storage */
 675         obstack_init(&data);
 676
 677         env.rodata_obst = &data;
 678         env.data_obst   = &data;
 679         env.comm_obst   = &data;
 680         env.ctor_obst   = NULL;
 681
 682         ia32_dump_globals(get_tls_type(), &env);
 683
 684         size = obstack_object_size(&data);
 685         cp   = obstack_finish(&data);
 686         if (size > 0) {
 687                 ia32_switch_section(out, SECTION_TLS);
 688                 ia32_dump_align_f(out, 32);
 689                 fwrite(cp, 1, size, out);
 690         }
 691
 692         obstack_free(&data, NULL);
 693 }