src/backends/jvm/generator-jvm-basic.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4 #include <stdbool.h>
   5 #include <string.h>
   6 #include <assert.h>
   7
   8 #include <gc.h>
   9
  10 #include "../../../include/oberon.h"
  11 #include "../../oberon-internals.h"
  12 #include "generator-jvm.h"
  13 #include "generator-jvm-basic.h"
  14
  15 char *
  16 new_string(const char * format, ...)
  17 {
  18         va_list ptr;
  19         va_start(ptr, format);
  20
  21         char buf[1024];
  22         vsnprintf(buf, 1024, format, ptr);
  23
  24         va_end(ptr);
  25
  26         char * result;
  27         int size;
  28
  29         size = strlen(buf);
  30         result = GC_MALLOC(size + 1);
  31         memset(result, 0, size);
  32         strncpy(result, buf, size);
  33
  34         return result;
  35 }
  36
  37 void
  38 gen_error(const char * fmt, ...)
  39 {
  40         va_list ptr;
  41         va_start(ptr, fmt);
  42         fprintf(stderr, "generator: ");
  43         vfprintf(stderr, fmt, ptr);
  44         fprintf(stderr, "\n");
  45         va_end(ptr);
  46         exit(1);
  47 }
  48
  49 char *
  50 jvm_get_descriptor(oberon_type_t * type)
  51 {
  52         char * desc;
  53
  54         switch(type -> class)
  55         {
  56                 case OBERON_TYPE_NOTYPE:
  57                         return new_string("V");
  58                         break;
  59                 case OBERON_TYPE_INTEGER:
  60                 case OBERON_TYPE_SET:
  61                         switch(type -> size)
  62                         {
  63                                 case 1:
  64                                         return new_string("B");
  65                                         break;
  66                                 case 2:
  67                                         return new_string("S");
  68                                         break;
  69                                 case 4:
  70                                         return new_string("I");
  71                                         break;
  72                                 case 8:
  73                                         return new_string("J");
  74                                         break;
  75                                 default:
  76                                         gen_error("jvm_get_descriptor: unsupported int size %i", type -> size);
  77                                         break;
  78                         }
  79                         break;
  80                 case OBERON_TYPE_REAL:
  81                         switch(type -> size)
  82                         {
  83                                 case 4:
  84                                         return new_string("F");
  85                                         break;
  86                                 case 8:
  87                                         return new_string("D");
  88                                         break;
  89                                 default:
  90                                         gen_error("jvm_get_descriptor: unsupported float size %i", type -> size);
  91                                         break;
  92                         }
  93                         break;
  94                 case OBERON_TYPE_CHAR:
  95                         switch(type -> size)
  96                         {
  97                                 case 1:
  98                                         return new_string("B");
  99                                         break;
 100                                 case 2:
 101                                         return new_string("C");
 102                                         break;
 103                                 case 4:
 104                                         return new_string("I");
 105                                         break;
 106                                 case 8:
 107                                         return new_string("J");
 108                                         break;
 109                                 default:
 110                                         gen_error("jvm_get_descriptor: unsupported char size %i", type -> size);
 111                                         break;
 112                         }
 113                         break;
 114                 case OBERON_TYPE_BOOLEAN:
 115                         return new_string("Z");
 116                         break;
 117                 case OBERON_TYPE_POINTER:
 118                         return jvm_get_descriptor(type -> base);
 119                         break;
 120                 case OBERON_TYPE_PROCEDURE:
 121                 case OBERON_TYPE_RECORD:
 122                         desc = jvm_get_class_full_name(type);
 123                         return new_string("L%s;", desc);
 124                         break;
 125                 case OBERON_TYPE_ARRAY:
 126                         desc = jvm_get_descriptor(type -> base);
 127                         return new_string("[%s", desc);
 128                         break;
 129                 case OBERON_TYPE_STRING:
 130                         switch(type -> size)
 131                         {
 132                                 case 1:
 133                                         return new_string("[B");
 134                                         break;
 135                                 case 2:
 136                                         return new_string("[C");
 137                                         break;
 138                                 case 4:
 139                                         return new_string("[I");
 140                                         break;
 141                                 case 8:
 142                                         return new_string("[J");
 143                                         break;
 144                                 default:
 145                                         gen_error("jvm_get_descriptor: unsupported string size %i", type -> size);
 146                                         break;
 147                         }
 148                         break;
 149                 default:
 150                         gen_error("jvm_get_descriptor: unsupported type class %i", type -> class);
 151                         break;
 152         }
 153
 154         return NULL;
 155 }
 156
 157 char *
 158 jvm_get_descriptor_safe(oberon_type_t * type)
 159 {
 160         switch(type -> class)
 161         {
 162                 case OBERON_TYPE_POINTER:
 163                         return new_string("PTR%s", jvm_get_descriptor_safe(type -> base));
 164                         break;
 165                 case OBERON_TYPE_PROCEDURE:
 166                 case OBERON_TYPE_RECORD:
 167                         return jvm_get_class_full_name(type);
 168                         break;
 169                 case OBERON_TYPE_ARRAY:
 170                         return new_string("A%s", jvm_get_descriptor_safe(type -> base));
 171                         break;
 172                 default:
 173                         return jvm_get_descriptor(type);
 174                         break;
 175         }
 176
 177         return NULL;
 178 }
 179
 180 char
 181 jvm_get_prefix(oberon_type_t * type)
 182 {
 183         int size = type -> size;
 184         switch(type -> class)
 185         {
 186                 case OBERON_TYPE_BOOLEAN:
 187                 case OBERON_TYPE_INTEGER:
 188                 case OBERON_TYPE_CHAR:
 189                 case OBERON_TYPE_SET:
 190                         return (size <= 4) ? ('i') : ('l');
 191                         break;
 192                 case OBERON_TYPE_PROCEDURE:
 193                 case OBERON_TYPE_ARRAY:
 194                 case OBERON_TYPE_RECORD:
 195                 case OBERON_TYPE_POINTER:
 196                 case OBERON_TYPE_STRING:
 197                 case OBERON_TYPE_NIL:
 198                         return 'a';
 199                         break;
 200                 case OBERON_TYPE_REAL:
 201                         return (size <= 4) ? ('f') : ('d');
 202                         break;
 203                 default:
 204                         gen_error("jvm_get_prefix: wat %i", type -> class);
 205                         return '!';
 206                         break;
 207         }
 208 }
 209
 210 char
 211 jvm_get_postfix(oberon_type_t * type)
 212 {
 213         int size = type -> size;
 214         switch(type -> class)
 215         {
 216                 case OBERON_TYPE_BOOLEAN:
 217                         return 'b';
 218                         break;
 219                 case OBERON_TYPE_INTEGER:
 220                 case OBERON_TYPE_SET:
 221                         switch(size)
 222                         {
 223                                 case 1:
 224                                         return 'b';
 225                                         break;
 226                                 case 2:
 227                                         return 's';
 228                                         break;
 229                                 case 4:
 230                                         return 'i';
 231                                         break;
 232                                 case 8:
 233                                         return 'l';
 234                                         break;
 235                                 default:
 236                                         gen_error("jvm_get_postfix: int wat");
 237                                         break;
 238                         }
 239                         break;
 240                 case OBERON_TYPE_CHAR:
 241                         switch(size)
 242                         {
 243                                 case 1:
 244                                         return 'b';
 245                                         break;
 246                                 case 2:
 247                                         return 'c';
 248                                         break;
 249                                 case 4:
 250                                         return 'i';
 251                                         break;
 252                                 case 8:
 253                                         return 'l';
 254                                         break;
 255                                 default:
 256                                         gen_error("jvm_get_postfix: char wat");
 257                                         break;
 258                         }
 259                         break;
 260                 case OBERON_TYPE_PROCEDURE:
 261                 case OBERON_TYPE_ARRAY:
 262                 case OBERON_TYPE_RECORD:
 263                 case OBERON_TYPE_POINTER:
 264                 case OBERON_TYPE_STRING:
 265                 case OBERON_TYPE_NIL:
 266                         return 'a';
 267                         break;
 268                 case OBERON_TYPE_REAL:
 269                         return (size <= 4) ? ('f') : ('d');
 270                         break;
 271                 default:
 272                         gen_error("jvm_get_postfix: wat");
 273                         break;
 274         }
 275
 276         return '!';
 277 }
 278
 279 char *
 280 jvm_get_name(oberon_object_t * x)
 281 {
 282         switch(x -> class)
 283         {
 284                 case OBERON_CLASS_VAR:
 285                 case OBERON_CLASS_VAR_PARAM:
 286                 case OBERON_CLASS_PARAM:
 287                 case OBERON_CLASS_FIELD:
 288                         return new_string(x -> name);
 289                 case OBERON_CLASS_PROC:
 290                         if(x -> parent)
 291                         {
 292                                 return new_string("%s$%s", jvm_get_name(x -> parent), x -> name);
 293                         }
 294                         else
 295                         {
 296                                 return new_string(x -> name);
 297                         }
 298                 default:
 299                         gen_error("jvm_get_name: wat");
 300         }
 301
 302         return NULL;
 303 }
 304
 305 char *
 306 jvm_get_field_full_name(oberon_object_t * x)
 307 {
 308         char * parent;
 309         switch(x -> class)
 310         {
 311                 case OBERON_CLASS_VAR:
 312                         return new_string("%s/%s", x -> module -> name, jvm_get_name(x));
 313                 case OBERON_CLASS_PROC:
 314                         return new_string("%s/%s", x -> module -> name, jvm_get_name(x));
 315                 case OBERON_CLASS_FIELD:
 316                         parent = jvm_get_class_full_name(x -> parent_type);
 317                         return new_string("%s/%s", parent, jvm_get_name(x));
 318                 case OBERON_CLASS_MODULE:
 319                         return new_string(x -> module -> name);
 320                 default:
 321                         gen_error("jvm_get_field_full_name: wat");
 322                         break;
 323         }
 324
 325         return NULL;
 326 }
 327
 328 char *
 329 jvm_get_field_full_name_safe(oberon_object_t * x)
 330 {
 331         switch(x -> class)
 332         {
 333                 case OBERON_CLASS_VAR:
 334                 case OBERON_CLASS_PROC:
 335                         return new_string("%s$%s", x -> module -> name, x -> name);
 336                 case OBERON_CLASS_FIELD:;
 337                         char * rec_name = jvm_get_class_full_name(x -> parent_type);
 338                         return new_string("%s$%s", rec_name, x -> name);
 339                 case OBERON_CLASS_MODULE:
 340                         return new_string(x -> module -> name);
 341                 default:
 342                         gen_error("jvm_get_field_full_name: wat");
 343                         break;
 344         }
 345
 346         return NULL;
 347 }
 348
 349 char *
 350 jvm_get_class_full_name(oberon_type_t * type)
 351 {
 352         int rec_id;
 353         char * name = NULL;
 354
 355         switch(type -> class)
 356         {
 357                 case OBERON_TYPE_POINTER:
 358                         name = jvm_get_class_full_name(type -> base);
 359                         break;
 360                 case OBERON_TYPE_PROCEDURE:
 361                         name = new_string("SYSTEM$PROCEDURE");
 362
 363                         char * desc;
 364                         desc = jvm_get_descriptor_safe(type -> base);
 365                         name = new_string("%s$%s", name, desc);
 366
 367                         int num = type -> num_decl;
 368                         oberon_object_t * arg = type -> decl;
 369                         for(int i = 0; i < num; i++)
 370                         {
 371                                 desc = jvm_get_descriptor_safe(arg -> type);
 372                                 name = new_string("%s%s", name, desc);
 373                                 arg = arg -> next;
 374                         }
 375
 376                         break;
 377                 case OBERON_TYPE_RECORD:
 378                         rec_id = type -> gen_type -> rec_id;
 379                         name = new_string("%s$RECORD%i", type -> module -> name, rec_id);
 380                         break;
 381                 default:
 382                         gen_error("jvm_get_class_full_name: unk type class %i", type -> class);
 383                         break;
 384         }
 385
 386         return name;
 387 }
 388
 389 int
 390 jvm_cell_size_for_type(oberon_type_t * type)
 391 {
 392         if(type -> class == OBERON_TYPE_INTEGER
 393                 || type -> class == OBERON_TYPE_REAL
 394                 || type -> class == OBERON_TYPE_CHAR
 395                 || type -> class == OBERON_TYPE_SET)
 396         {
 397                 if(type -> size > 4)
 398                 {
 399                         return 2;
 400                 }
 401         }
 402         else if(type -> class == OBERON_TYPE_NOTYPE)
 403         {
 404                 return 0;
 405         }
 406
 407         return 1;
 408 }
 409
 410 int
 411 jvm_cell_size_for_postfix(char postfix)
 412 {
 413         switch(postfix)
 414         {
 415                 case 'a':
 416                 case 'b':
 417                 case 's':
 418                 case 'i':
 419                 case 'f':
 420                         return 1;
 421                 case 'l':
 422                 case 'd':
 423                         return 2;
 424                 default:
 425                         gen_error("jvm_cell_size_for_postfix: unk postfix %c", postfix);
 426         }
 427
 428         return -666;
 429 }
 430
 431 bool
 432 jvm_is_wide_type(oberon_type_t * type)
 433 {
 434         int cell;
 435         cell = jvm_cell_size_for_type(type);
 436         assert(cell <= 2);
 437         return (cell == 2);
 438 }
 439
 440 bool
 441 jvm_is_free_register(struct gen_register_file * rf, int i, bool wide)
 442 {
 443         if(wide)
 444         {
 445                 assert(i + 1 < MAX_REGISTERS);
 446                 return !(rf -> reg[i].used || rf -> reg[i + 1].used);
 447         }
 448         else
 449         {
 450                 assert(i < MAX_REGISTERS);
 451                 return !(rf -> reg[i].used);
 452         }
 453 }
 454
 455 int
 456 jvm_alloc_register_untyped(struct gen_register_file * rf, bool wide)
 457 {
 458         int i = 0;
 459         while(i < MAX_REGISTERS && !jvm_is_free_register(rf, i, wide))
 460         {
 461                 i += 1;
 462         }
 463
 464         if(wide)
 465         {
 466                 assert(i + 1 <= MAX_REGISTERS);
 467                 rf -> num_used += 2;
 468                 rf -> reg[i].used = true;
 469                 rf -> reg[i + 1].used = true;
 470                 rf -> reg[i].used = true;
 471                 rf -> reg[i + 1].wide = false;
 472         }
 473         else
 474         {
 475                 assert(i <= MAX_REGISTERS);
 476                 rf -> num_used += 1;
 477                 rf -> reg[i].used = true;
 478                 rf -> reg[i].wide = false;
 479         }
 480
 481         if(rf -> num_used > rf -> max_used)
 482         {
 483                 rf -> max_used = rf -> num_used;
 484         }
 485
 486         return i;
 487 }
 488
 489 int
 490 jvm_alloc_register(struct gen_register_file * rf, oberon_type_t * type)
 491 {
 492         bool wide;
 493         wide = jvm_is_wide_type(type);
 494         return jvm_alloc_register_untyped(rf, wide);
 495 }
 496
 497 char
 498 jvm_get_type_of_prefix(char prefix)
 499 {
 500         switch(prefix)
 501         {
 502                 case 'b':
 503                         return 'B';
 504                 case 'c':
 505                         return 'C';
 506                 case 'd':
 507                         return 'D';
 508                 case 'f':
 509                         return 'F';
 510                 case 'i':
 511                         return 'I';
 512                 case 'l':
 513                         return 'J';
 514         }
 515
 516         assert(0);
 517 }