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_type_size:
 161                         obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
 162                         break;
 163
 164                 case symconst_type_align:
 165                         obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
 166                         break;
 167
 168                 default:
 169                         assert(0 && "dump_atomic_init(): don't know how to init from this SymConst");
 170                 }
 171                 return;
 172
 173                 case iro_Add:
 174                         do_dump_atomic_init(obst, get_Add_left(init));
 175                         obstack_printf(obst, " + ");
 176                         do_dump_atomic_init(obst, get_Add_right(init));
 177                         return;
 178
 179                 case iro_Sub:
 180                         do_dump_atomic_init(obst, get_Sub_left(init));
 181                         obstack_printf(obst, " - ");
 182                         do_dump_atomic_init(obst, get_Sub_right(init));
 183                         return;
 184
 185                 case iro_Mul:
 186                         do_dump_atomic_init(obst, get_Mul_left(init));
 187                         obstack_printf(obst, " * ");
 188                         do_dump_atomic_init(obst, get_Mul_right(init));
 189                         return;
 190
 191                 default:
 192                         assert(0 && "dump_atomic_init(): unknown IR-node");
 193         }
 194 }
 195
 196 /*
 197  * dump an atomic value
 198  */
 199 static void dump_atomic_init(struct obstack *obst, ir_node *init)
 200 {
 201         ir_mode *mode = get_irn_mode(init);
 202         int bytes     = get_mode_size_bytes(mode);
 203
 204         switch (bytes) {
 205
 206         case 1:
 207                 obstack_printf(obst, "\t.byte\t");
 208                 break;
 209
 210         case 2:
 211                 obstack_printf(obst, "\t.value\t");
 212                 break;
 213
 214         case 4:
 215                 obstack_printf(obst, "\t.long\t");
 216                 break;
 217
 218         case 8:
 219                 obstack_printf(obst, "\t.quad\t");
 220                 break;
 221
 222         case 10:
 223         case 12:
 224                 /* handled in arith */
 225                 break;
 226
 227         default:
 228                 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
 229                 assert(0);
 230         }
 231
 232         do_dump_atomic_init(obst, init);
 233         obstack_printf(obst, "\n");
 234 }
 235
 236 /************************************************************************/
 237 /* Routines to dump global variables                                    */
 238 /************************************************************************/
 239
 240 /**
 241  * Determine if an entity is a string constant
 242  * @param ent The entity
 243  * @return 1 if it is a string constant, 0 otherwise
 244  */
 245 static int ent_is_string_const(entity *ent)
 246 {
 247         int res = 0;
 248         ir_type *ty;
 249
 250         ty = get_entity_type(ent);
 251
 252         /* if it's an array */
 253         if (is_Array_type(ty)) {
 254                 ir_type *elm_ty = get_array_element_type(ty);
 255
 256                 /* and the array's element type is primitive */
 257                 if (is_Primitive_type(elm_ty)) {
 258                         ir_mode *mode = get_type_mode(elm_ty);
 259
 260                         /*
 261                         * and the mode of the element type is an int of
 262                         * the same size as the byte mode
 263                         */
 264                         if (mode_is_int(mode)
 265                                 && get_mode_size_bits(mode) == get_mode_size_bits(mode_Bs))
 266                         {
 267                                 int i, c, n;
 268
 269                                 n = get_compound_ent_n_values(ent);
 270                                 for (i = 0; i < n; ++i) {
 271                                         ir_node *irn = get_compound_ent_value(ent, i);
 272                                         if(get_irn_opcode(irn) != iro_Const)
 273                                                 return 0;
 274
 275                                         c = (int) get_tarval_long(get_Const_tarval(irn));
 276
 277                                         if((i < n - 1 && !(isgraph(c) || isspace(c)))
 278                                                 || (i == n - 1 && c != '\0'))
 279                                                 return 0;
 280                                 }
 281
 282                                 res = 1;
 283                         }
 284                 }
 285         }
 286
 287         return res;
 288 }
 289
 290 /**
 291  * Dump a atring constant.
 292  * No checks are made!!
 293  * @param obst The obst to dump on.
 294  * @param ent The entity to dump.
 295  */
 296 static void dump_string_cst(struct obstack *obst, entity *ent)
 297 {
 298         int i, n;
 299
 300         obstack_printf(obst, "\t.string \"");
 301         n = get_compound_ent_n_values(ent);
 302
 303         for (i = 0; i < n-1; ++i) {
 304                 ir_node *irn;
 305                 int c;
 306
 307                 irn = get_compound_ent_value(ent, i);
 308                 c = (int) get_tarval_long(get_Const_tarval(irn));
 309
 310                 switch (c) {
 311                 case '"' : obstack_printf(obst, "\\\""); break;
 312                 case '\n': obstack_printf(obst, "\\n"); break;
 313                 case '\r': obstack_printf(obst, "\\r"); break;
 314                 case '\t': obstack_printf(obst, "\\t"); break;
 315                 default  :
 316                         if (isprint(c))
 317                                 obstack_printf(obst, "%c", c);
 318                         else
 319                                 obstack_printf(obst, "%O", c);
 320                         break;
 321                 }
 322         }
 323         obstack_printf(obst, "\"\n");
 324 }
 325
 326 struct arr_info {
 327         int n_elems;
 328         int visit_cnt;
 329         int size;
 330 };
 331
 332 static void dump_object_size(struct obstack *obst, const char *name, int size) {
 333         switch (asm_flavour) {
 334         case ASM_LINUX_GAS:
 335                 obstack_printf(obst, "\t.type\t%s,@object\n", name);
 336                 obstack_printf(obst, "\t.size\t%s,%d\n", name, size);
 337                 break;
 338         }
 339 }
 340
 341 /*
 342  * Dumps the initialization of global variables that are not
 343  * "uninitialized".
 344  */
 345 static void dump_global(struct obstack *rdata_obstack, struct obstack *data_obstack, struct obstack *comm_obstack, entity *ent)
 346 {
 347         ir_type *ty         = get_entity_type(ent);
 348         const char *ld_name = get_entity_ld_name(ent);
 349         int align, h;
 350         struct obstack *obst = data_obstack;
 351
 352         /*
 353         * FIXME: did NOT work for partly constant values
 354         */
 355         if (! is_Method_type(ty)) {
 356                 ent_variability variability = get_entity_variability(ent);
 357                 visibility visibility = get_entity_visibility(ent);
 358
 359                 if (variability == variability_constant) {
 360                         /* a constant entity, put it on the rdata */
 361                         obst = rdata_obstack;
 362                 }
 363
 364                 /* check, whether it is initialized, if yes create data */
 365                 if (variability != variability_uninitialized) {
 366                         if (visibility == visibility_external_visible) {
 367                                 obstack_printf(obst, ".globl\t%s\n", ld_name);
 368                         }
 369                         dump_object_size(obst, ld_name, (get_type_size_bits(ty) + 7) >> 3);
 370
 371                         align = get_type_alignment_bytes(ty);
 372                         ia32_dump_align(obst, align);
 373
 374                         obstack_printf(obst, "%s:\n", ld_name);
 375
 376                         if (is_atomic_type(ty)) {
 377                                 if (get_entity_visibility(ent) != visibility_external_allocated)
 378                                         dump_atomic_init(obst, get_atomic_ent_value(ent));
 379                         }
 380                         else {
 381                                 int i, size = 0;
 382
 383                                 if (ent_is_string_const(ent)) {
 384                                         dump_string_cst(obst, ent);
 385                                 }
 386                                 else if (is_Array_type(ty)) {
 387                                         int filler;
 388
 389                                         /* potential spare values should be already included! */
 390                                         for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
 391                                                 entity *step = get_compound_ent_value_member(ent, i);
 392                                                 ir_type *stype = get_entity_type(step);
 393
 394                                                 if (get_type_mode(stype)) {
 395                                                         int align = (get_type_alignment_bits(stype) + 7) >> 3;
 396                                                         int n     = size % align;
 397
 398                                                         if (n > 0) {
 399                                                                 obstack_printf(obst, "\t.zero\t%d\n", align - n);
 400                                                                 size += align - n;
 401                                                         }
 402                                                 }
 403                                                 dump_atomic_init(obst, get_compound_ent_value(ent, i));
 404                                                 size += get_type_size_bytes(stype);
 405                                         }
 406                                         filler = get_type_size_bytes(ty) - size;
 407
 408                                         if (filler > 0)
 409                                                 obstack_printf(obst, "\t.zero\t%d\n", filler);
 410                                 }
 411                                 else if (is_compound_type(ty)) {
 412                                         ir_node **vals;
 413                                         int type_size, j;
 414
 415                                         /* Compound entities are NOT sorted.
 416                                         * The sorting strategy used doesn't work for `value' compound fields nor
 417                                         * for partially_constant entities.
 418                                         */
 419
 420                                         /*
 421                                         * in the worst case, every entity allocates one byte, so the type
 422                                         * size should be equal or bigger the number of fields
 423                                         */
 424                                         type_size = get_type_size_bytes(ty);
 425                                         vals      = xcalloc(type_size, sizeof(*vals));
 426
 427                                         /* collect the values and store them at the offsets */
 428                                         for(i = 0; i < get_compound_ent_n_values(ent); ++i) {
 429                                                 int                 graph_length, aipos, offset;
 430                                                 struct arr_info     *ai;
 431                                                 int                 all_n = 1;
 432                                                 compound_graph_path *path = get_compound_ent_value_path(ent, i);
 433
 434                                                 /* get the access path to the costant value */
 435                                                 graph_length = get_compound_graph_path_length(path);
 436                                                 ai = xcalloc(graph_length, sizeof(struct arr_info));
 437
 438                                                 /* We wanna know how many arrays are on the path to the entity. We also have to know how
 439                                                 * many elements each array holds to calculate the offset for the entity. */
 440                                                 for (j = 0; j < graph_length; j++) {
 441                                                         entity  *step      = get_compound_graph_path_node(path, j);
 442                                                         ir_type *step_type = get_entity_type(step);
 443                                                         int     ty_size    = (get_type_size_bits(step_type) + 7) >> 3;
 444                                                         int     k, n       = 0;
 445
 446                                                         if (is_Array_type(step_type))
 447                                                                 for (k = 0; k < get_array_n_dimensions(step_type); k++)
 448                                                                         n += get_tarval_long(get_Const_tarval(get_array_upper_bound(step_type, k)));
 449                                                                 if (n) all_n *= n;
 450                                                                 ai[j].n_elems = n ? all_n + 1 : 0;
 451                                                                 ai[j].visit_cnt = 0;
 452                                                                 ai[j].size = ty_size;
 453                                                 }
 454
 455                                                 aipos = graph_length - 1;
 456                                                 if (aipos) aipos--;
 457
 458                                                 for (offset = j = 0; j < graph_length; j++) {
 459                                                         entity *step       = get_compound_graph_path_node(path, j);
 460                                                         ir_type *step_type = get_entity_type(step);
 461                                                         int ent_ofs        = get_entity_offset_bytes(step);
 462                                                         int stepsize       = 0;
 463
 464                                                         /* add all positive offsets (= offsets in structs) */
 465                                                         if (ent_ofs >= 0) offset += ent_ofs;
 466
 467                                                         if (j == graph_length - 1) {
 468                                                                 stepsize = (get_type_size_bits(step_type) + 7) >> 3;
 469
 470                                                                 /* Search the next free position in vals depending on the information from above (ai). */
 471                                                                 while (vals[offset]) {
 472                                                                         if (ai[aipos].visit_cnt < ai[aipos].n_elems) {
 473                                                                                 offset += stepsize;
 474                                                                                 ai[aipos].visit_cnt++;
 475                                                                         }
 476                                                                         else
 477                                                                                 while (aipos >= 0 && ai[aipos].visit_cnt == ai[aipos].n_elems) {
 478                                                                                         stepsize = ai[aipos--].size;
 479                                                                                         offset  += stepsize;
 480                                                                                 }
 481                                                                 }
 482
 483                                                                 assert(aipos >= 0 && "couldn't store entity");
 484                                                                 vals[offset] = get_compound_ent_value(ent, i);
 485                                                         }
 486                                                 }
 487
 488                                                 free(ai);
 489                                         }
 490
 491                                         /* now write them sorted */
 492                                         for(i = 0; i < type_size; ) {
 493                                                 if (vals[i]) {
 494                                                         dump_atomic_init(obst, vals[i]);
 495                                                         i += (get_mode_size_bytes(get_irn_mode(vals[i])));
 496                                                 }
 497                                                 else {
 498                                                         /* a gap */
 499                                                         obstack_printf(obst, "\t.byte\t0\n");
 500                                                         ++i;
 501                                                 }
 502                                         }
 503                                         free(vals);
 504                                 }
 505                                 else {
 506                                         assert(0 && "unsupported type");
 507                                 }
 508                         }
 509                         obstack_printf(obst, "\n");
 510                 }
 511                 else if (visibility != visibility_external_allocated) {
 512                         /* calculate the alignment */
 513                         align = get_type_alignment_bytes(ty);
 514                         h = highest_bit(align);
 515
 516                         if ((1 << h) < align)
 517                                 ++h;
 518                         align = (1 << h);
 519
 520                         if (align < 1)
 521                                 align = 1;
 522
 523                         ia32_dump_comm(comm_obstack, ld_name, visibility,
 524                                 (get_type_size_bits(ty) + 7) >> 3, align);
 525                 }
 526         }
 527 }
 528
 529 /*
 530  * Dumps declarations of global variables and the initialization code.
 531  */
 532 void ia32_dump_globals(struct obstack *rdata_obstack, struct obstack *data_obstack, struct obstack *comm_obstack)
 533 {
 534         ir_type *gt = get_glob_type();
 535         int i, n = get_class_n_members(gt);
 536
 537         for (i = 0; i < n; i++)
 538                 dump_global(rdata_obstack, data_obstack, comm_obstack, get_class_member(gt, i));
 539 }
 540
 541 /************************************************************************/
 542
 543 void ia32_gen_decls(FILE *out) {
 544         struct obstack rodata, data, comm;
 545         int    size;
 546         char   *cp;
 547
 548         obstack_init(&rodata);
 549         obstack_init(&data);
 550         obstack_init(&comm);
 551
 552         ia32_dump_globals(&rodata, &data, &comm);
 553
 554         size = obstack_object_size(&data);
 555         cp   = obstack_finish(&data);
 556         if (size > 0) {
 557                 ia32_switch_section(out, SECTION_DATA);
 558                 fwrite(cp, 1, size, out);
 559         }
 560
 561         size = obstack_object_size(&rodata);
 562         cp   = obstack_finish(&rodata);
 563         if (size > 0) {
 564                 fprintf(out, "\t.section\t.rodata\n");
 565                 fwrite(cp, 1, size, out);
 566         }
 567
 568         size = obstack_object_size(&comm);
 569         cp   = obstack_finish(&comm);
 570         if (size > 0) {
 571                 ia32_switch_section(out, SECTION_COMMON);
 572                 fwrite(cp, 1, size, out);
 573         }
 574
 575         obstack_free(&rodata, NULL);
 576         obstack_free(&data, NULL);
 577         obstack_free(&comm, NULL);
 578 }