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_VOID:
  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                         return 'a';
 198                         break;
 199                 case OBERON_TYPE_REAL:
 200                         return (size <= 4) ? ('f') : ('d');
 201                         break;
 202                 default:
 203                         gen_error("jvm_get_prefix: wat %i", type -> class);
 204                         return '!';
 205                         break;
 206         }
 207 }
 208
 209 char
 210 jvm_get_postfix(oberon_type_t * type)
 211 {
 212         int size = type -> size;
 213         switch(type -> class)
 214         {
 215                 case OBERON_TYPE_BOOLEAN:
 216                         return 'b';
 217                         break;
 218                 case OBERON_TYPE_INTEGER:
 219                 case OBERON_TYPE_SET:
 220                         switch(size)
 221                         {
 222                                 case 1:
 223                                         return 'b';
 224                                         break;
 225                                 case 2:
 226                                         return 's';
 227                                         break;
 228                                 case 4:
 229                                         return 'i';
 230                                         break;
 231                                 case 8:
 232                                         return 'l';
 233                                         break;
 234                                 default:
 235                                         gen_error("jvm_get_postfix: int wat");
 236                                         break;
 237                         }
 238                         break;
 239                 case OBERON_TYPE_CHAR:
 240                         switch(size)
 241                         {
 242                                 case 1:
 243                                         return 'b';
 244                                         break;
 245                                 case 2:
 246                                         return 'c';
 247                                         break;
 248                                 case 4:
 249                                         return 'i';
 250                                         break;
 251                                 case 8:
 252                                         return 'l';
 253                                         break;
 254                                 default:
 255                                         gen_error("jvm_get_postfix: char wat");
 256                                         break;
 257                         }
 258                         break;
 259                 case OBERON_TYPE_PROCEDURE:
 260                 case OBERON_TYPE_ARRAY:
 261                 case OBERON_TYPE_RECORD:
 262                 case OBERON_TYPE_POINTER:
 263                 case OBERON_TYPE_STRING:
 264                         return 'a';
 265                         break;
 266                 case OBERON_TYPE_REAL:
 267                         return (size <= 4) ? ('f') : ('d');
 268                         break;
 269                 default:
 270                         gen_error("jvm_get_postfix: wat");
 271                         break;
 272         }
 273
 274         return '!';
 275 }
 276
 277 char *
 278 jvm_get_field_full_name(oberon_object_t * x)
 279 {
 280         switch(x -> class)
 281         {
 282                 case OBERON_CLASS_VAR:
 283                 case OBERON_CLASS_PROC:
 284                         return new_string("%s/%s", x -> module -> name, x -> name);
 285                 case OBERON_CLASS_FIELD:;
 286                         char * rec_name = jvm_get_class_full_name(x -> parent_type);
 287                         return new_string("%s/%s", rec_name, x -> name);
 288                 case OBERON_CLASS_MODULE:
 289                         return new_string(x -> module -> name);
 290                 default:
 291                         gen_error("jvm_get_field_full_name: wat");
 292                         break;
 293         }
 294
 295         return NULL;
 296 }
 297
 298 char *
 299 jvm_get_field_full_name_safe(oberon_object_t * x)
 300 {
 301         switch(x -> class)
 302         {
 303                 case OBERON_CLASS_VAR:
 304                 case OBERON_CLASS_PROC:
 305                         return new_string("%s$%s", x -> module -> name, x -> name);
 306                 case OBERON_CLASS_FIELD:;
 307                         char * rec_name = jvm_get_class_full_name(x -> parent_type);
 308                         return new_string("%s$%s", rec_name, x -> name);
 309                 case OBERON_CLASS_MODULE:
 310                         return new_string(x -> module -> name);
 311                 default:
 312                         gen_error("jvm_get_field_full_name: wat");
 313                         break;
 314         }
 315
 316         return NULL;
 317 }
 318
 319 char *
 320 jvm_get_class_full_name(oberon_type_t * type)
 321 {
 322         int rec_id;
 323         char * name = NULL;
 324
 325         switch(type -> class)
 326         {
 327                 case OBERON_TYPE_POINTER:
 328                         name = jvm_get_class_full_name(type -> base);
 329                         break;
 330                 case OBERON_TYPE_PROCEDURE:
 331                         name = new_string("SYSTEM$PROCEDURE");
 332
 333                         char * desc;
 334                         desc = jvm_get_descriptor_safe(type -> base);
 335                         name = new_string("%s$%s", name, desc);
 336
 337                         int num = type -> num_decl;
 338                         oberon_object_t * arg = type -> decl;
 339                         for(int i = 0; i < num; i++)
 340                         {
 341                                 desc = jvm_get_descriptor_safe(arg -> type);
 342                                 name = new_string("%s%s", name, desc);
 343                                 arg = arg -> next;
 344                         }
 345
 346                         break;
 347                 case OBERON_TYPE_RECORD:
 348                         rec_id = type -> gen_type -> rec_id;
 349                         name = new_string("%s$RECORD%i", type -> module -> name, rec_id);
 350                         break;
 351                 default:
 352                         gen_error("jvm_get_class_full_name: unk type class %i", type -> class);
 353                         break;
 354         }
 355
 356         return name;
 357 }
 358
 359 char *
 360 jvm_get_procedure_signature(oberon_type_t * proc)
 361 {
 362         char * signature;
 363         char * desc;
 364
 365         signature = new_string("(");
 366
 367         int num = proc -> num_decl;
 368         oberon_object_t * arg = proc -> decl;
 369         for(int i = 0; i < num; i++)
 370         {
 371                 desc = jvm_get_descriptor(arg -> type);
 372                 if(arg -> class == OBERON_CLASS_VAR_PARAM)
 373                 {
 374                         signature = new_string("%s[%sI", signature, desc);
 375                 }
 376                 else
 377                 {
 378                         signature = new_string("%s%s", signature, desc);
 379                 }
 380                 arg = arg -> next;
 381         }
 382
 383         desc = jvm_get_descriptor(proc -> base);
 384         signature = new_string("%s)%s", signature, desc);
 385
 386         return signature;
 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_VOID)
 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 }