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