generator.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4 #include <ctype.h>
   5 #include <string.h>
   6 #include <assert.h>
   7 #include <stdbool.h>
   8
   9 #include <gc.h>
  10
  11 #include "oberon.h"
  12 #include "generator.h"
  13
  14 // =======================================================================
  15 //   INTERNAL FUNCTIONS
  16 // =======================================================================
  17
  18 static void *
  19 __OBERON_ALLOC__ (size_t bytes)
  20 {
  21         void * p = GC_MALLOC(bytes);
  22         memset(p, 0, bytes);
  23         printf("allocated %lu bytes\n", bytes);
  24         return p;
  25 }
  26
  27 // =======================================================================
  28 //   ALLOC
  29 // =======================================================================
  30
  31 static void
  32 oberon_generator_open_block(gen_context_t * gen_context, gcc_jit_block * gcc_block)
  33 {
  34         gen_block_t * block = malloc(sizeof *block);
  35         memset(block, 0, sizeof *block);
  36
  37         block -> gcc_block = gcc_block;
  38         block -> up = gen_context -> block;
  39
  40         gen_context -> block = block;
  41 }
  42
  43 static void
  44 oberon_generator_close_block(gen_context_t * gen_context)
  45 {
  46         gen_context -> block = gen_context -> block -> up;
  47 }
  48
  49 void
  50 oberon_generator_init_context(oberon_context_t * ctx)
  51 {
  52         gen_context_t * gen_context = malloc(sizeof *gen_context);
  53         memset(gen_context, 0, sizeof *gen_context);
  54
  55         gcc_jit_context * gcc_context;
  56         gcc_context = gcc_jit_context_acquire();
  57
  58         ctx -> gen_context = gen_context;
  59         gen_context -> gcc_context = gcc_context;
  60
  61         gcc_jit_type * void_ptr_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_VOID_PTR);
  62         gcc_jit_type * size_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_SIZE_T);
  63         gcc_jit_type * alloc_ptr_type = gcc_jit_context_new_function_ptr_type(
  64                 gcc_context, NULL, void_ptr_type, 1, &size_type, 0
  65         );
  66         gen_context -> gcc_alloc = gcc_jit_context_new_global(
  67                 gcc_context, NULL, GCC_JIT_GLOBAL_EXPORTED, alloc_ptr_type, "__OBERON_ALLOC__"
  68         );
  69 }
  70
  71 void
  72 oberon_generator_destroy_context(oberon_context_t * ctx)
  73 {
  74         gen_context_t * gen_context = ctx -> gen_context;
  75         gcc_jit_context * gcc_context = gen_context -> gcc_context;
  76
  77         gcc_jit_context_release(gcc_context);
  78 }
  79
  80 void
  81 oberon_generator_init_type(oberon_context_t * ctx, oberon_type_t * type)
  82 {
  83         gen_type_t * gen_type = malloc(sizeof *gen_type);
  84         memset(gen_type, 0, sizeof *gen_type);
  85         type -> gen_type = gen_type;
  86
  87         gen_context_t * gen_context = ctx -> gen_context;
  88         gcc_jit_context * gcc_context = gen_context -> gcc_context;
  89
  90         gcc_jit_type * gcc_type = NULL;
  91         gcc_jit_struct * gcc_struct = NULL;
  92         if(type -> class == OBERON_TYPE_VOID)
  93         {
  94                 gcc_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_VOID);
  95         }
  96         else if(type -> class == OBERON_TYPE_INTEGER)
  97         {
  98                 gcc_type = gcc_jit_context_get_int_type(gcc_context, type -> size, 1);
  99         }
 100         else if(type -> class == OBERON_TYPE_BOOLEAN)
 101         {
 102                 if(type -> size == sizeof(bool))
 103                 {
 104                         gcc_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_BOOL);
 105                 }
 106                 else
 107                 {
 108                         oberon_error(ctx, "generator: unsupported boolean size");
 109                 }
 110         }
 111         else if(type -> class == OBERON_TYPE_REAL)
 112         {
 113                 if(type -> size == sizeof(float))
 114                 {
 115                         gcc_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_FLOAT);
 116                 }
 117                 else if(type -> size == sizeof(double))
 118                 {
 119                         gcc_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_DOUBLE);
 120                 }
 121                 else if(type -> size == sizeof(long double))
 122                 {
 123                         gcc_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_LONG_DOUBLE);
 124                 }
 125                 else
 126                 {
 127                         oberon_error(ctx, "generator: unsupported real size");
 128                 }
 129         }
 130         else if(type -> class == OBERON_TYPE_ARRAY)
 131         {
 132                 gen_type_t * gen_base = type -> base -> gen_type;
 133                 gcc_jit_type * gcc_base = gen_base -> gcc_type;
 134                 gcc_type = gcc_jit_context_new_array_type(gcc_context, NULL, gcc_base, type -> size);
 135         }
 136         else if(type -> class == OBERON_TYPE_RECORD)
 137         {
 138                 char name[32];
 139                 snprintf(name, 32, "RECORD%u", gen_context -> record_count);
 140                 gen_context -> record_count += 1;
 141
 142                 gcc_struct = gcc_jit_context_new_opaque_struct(gcc_context, NULL, name);
 143                 gcc_type = gcc_jit_struct_as_type(gcc_struct);
 144         }
 145         else if(type -> class == OBERON_TYPE_POINTER)
 146         {
 147                 gen_type_t * gen_base = type -> base -> gen_type;
 148                 gcc_jit_type * gcc_base = gen_base -> gcc_type;
 149                 gcc_type = gcc_jit_type_get_pointer(gcc_base);
 150         }
 151         else if(type -> class == OBERON_TYPE_PROCEDURE)
 152         {
 153                 int num_params = type -> num_decl;
 154                 gcc_jit_type * params[num_params];
 155                 oberon_object_t * o = type -> decl;
 156                 for(int i = 0; i < num_params; i++)
 157                 {
 158                         gen_type_t * gen_type = o -> type -> gen_type;
 159                         params[i] = gen_type -> gcc_type;
 160                         o = o -> next;
 161                 }
 162
 163                 gen_type_t * base = type -> base -> gen_type;
 164                 gcc_jit_type * result_type = base -> gcc_type;
 165
 166                 gcc_type = gcc_jit_context_new_function_ptr_type(
 167                         gcc_context, NULL, result_type, num_params, params, 0
 168                 );
 169         }
 170         else
 171         {
 172                 oberon_error(ctx, "oberon_generator_init_type: invalid type class %i", type -> class);
 173         }
 174
 175         assert(gcc_type);
 176         gen_type -> gcc_type = gcc_type;
 177         gen_type -> gcc_struct = gcc_struct;
 178 }
 179
 180 void
 181 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * type)
 182 {
 183         assert(type -> class == OBERON_TYPE_RECORD);
 184
 185         gen_type_t * gen_type = type -> gen_type;
 186         gcc_jit_struct * gcc_struct = gen_type -> gcc_struct;
 187
 188         // TODO type exstension
 189
 190         int num_fields = type -> num_decl;
 191         gcc_jit_field * fields[num_fields];
 192         oberon_object_t * o = type -> decl;
 193         for(int i = 0; i < num_fields; i++)
 194         {
 195                 assert(o -> class == OBERON_CLASS_FIELD);
 196                 gen_var_t * var = o -> gen_var;
 197                 fields[i] = var -> gcc_field;
 198                 o = o -> next;
 199         }
 200
 201         gcc_jit_struct_set_fields (gcc_struct, NULL, num_fields, fields);
 202
 203         //gcc_struct = gcc_jit_context_new_struct_type(gcc_context, NULL, "", num_fields, fields);
 204 }
 205
 206 static void
 207 oberon_generator_get_full_name(char * name, int max_len, oberon_object_t * x)
 208 {
 209         if(!x)
 210         {
 211                 name[0] = 0;
 212                 return;
 213         }
 214
 215         int add_module_prefix;
 216         switch(x -> class)
 217         {
 218                 case OBERON_CLASS_FIELD:
 219                 case OBERON_CLASS_PARAM:
 220                 case OBERON_CLASS_VAR_PARAM:
 221                         /* В локальных областях префиксы излишни */
 222                         add_module_prefix = 0;
 223                         break;
 224                 default:
 225                         add_module_prefix = 1;
 226                         break;
 227         }
 228
 229         char parent[256];
 230         oberon_generator_get_full_name(parent, 256, x -> parent);
 231
 232         if(strlen(parent) > 0)
 233         {
 234                 snprintf(name, max_len, "%s_%s", parent, x -> name);
 235         }
 236         else if(add_module_prefix)
 237         {
 238                 snprintf(name, max_len, "%s_%s", x -> module -> name, x -> name);
 239         }
 240         else
 241         {
 242                 snprintf(name, max_len, "%s", x -> name);
 243         }
 244 }
 245
 246 void
 247 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
 248 {
 249         gen_context_t * gen_context = ctx -> gen_context;
 250         gen_type_t * gen_type = var -> type -> gen_type;
 251
 252         gen_var_t * gen_var = malloc(sizeof *gen_var);
 253         memset(gen_var, 0, sizeof *gen_var);
 254         var -> gen_var = gen_var;
 255
 256         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 257         gcc_jit_type * gcc_type = gen_type -> gcc_type;
 258
 259         char name[256];
 260         oberon_generator_get_full_name(name, 256, var);
 261
 262         gcc_jit_lvalue * gcc_lvalue = NULL;
 263         gcc_jit_param * gcc_param = NULL;
 264         gcc_jit_field * gcc_field = NULL;
 265         if(var -> class == OBERON_CLASS_VAR)
 266         {
 267                 if(var -> local)
 268                 {
 269                         gen_proc_t * gen_func = var -> parent -> gen_proc;
 270                         gcc_jit_function * func = gen_func -> gcc_func;
 271
 272                         gcc_lvalue = gcc_jit_function_new_local(func, NULL, gcc_type, name);
 273                 }
 274                 else
 275                 {
 276                         gcc_lvalue = gcc_jit_context_new_global(
 277                                 gcc_context, NULL, GCC_JIT_GLOBAL_EXPORTED, gcc_type, name
 278                         );
 279                 }
 280         }
 281         else if(var -> class == OBERON_CLASS_PARAM)
 282         {
 283                 gcc_param = gcc_jit_context_new_param(gcc_context, NULL, gcc_type, name);
 284                 gcc_lvalue = gcc_jit_param_as_lvalue(gcc_param);
 285         }
 286         else if(var -> class == OBERON_CLASS_VAR_PARAM)
 287         {
 288                 gcc_type = gcc_jit_type_get_pointer(gcc_type);
 289                 gcc_param = gcc_jit_context_new_param(gcc_context, NULL, gcc_type, name);
 290                 gcc_lvalue = gcc_jit_param_as_lvalue(gcc_param);
 291         }
 292         else if(var -> class == OBERON_CLASS_FIELD)
 293         {
 294                 gcc_field = gcc_jit_context_new_field(gcc_context, NULL, gcc_type, name);
 295         }
 296         else
 297         {
 298                 oberon_error(ctx, "oberon_generator_init_var: invalid class %i", var -> class);
 299         }
 300
 301         gen_var -> gcc_lvalue = gcc_lvalue;
 302         gen_var -> gcc_param = gcc_param;
 303         gen_var -> gcc_field = gcc_field;
 304 }
 305
 306 void
 307 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
 308 {
 309         if(proc -> local)
 310         {
 311                 oberon_error(ctx, "generator: local procedures not supported");
 312         }
 313
 314         gen_context_t * gen_context = ctx -> gen_context;
 315         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 316
 317         gen_proc_t * gen_proc = malloc(sizeof *gen_proc);
 318         memset(gen_proc, 0, sizeof *gen_proc);
 319         proc -> gen_proc = gen_proc;
 320
 321         char name[256];
 322         oberon_generator_get_full_name(name, 256, proc);
 323
 324         gen_type_t * gen_result_type = proc -> type -> base -> gen_type;
 325         gcc_jit_type * result_type = gen_result_type -> gcc_type;
 326
 327         /* Строим список параметров */
 328         int num_param = proc -> type -> num_decl;
 329         oberon_object_t * o = proc -> type -> decl;
 330         gcc_jit_param * params[num_param];
 331         for(int i = 0; i < num_param; i++)
 332         {
 333                 gen_var_t * param_var = o -> gen_var;
 334                 params[i] = param_var -> gcc_param;
 335                 o = o -> next;
 336         }
 337
 338         gcc_jit_function * gcc_func;
 339         gcc_func = gcc_jit_context_new_function(
 340                 gcc_context, NULL, GCC_JIT_FUNCTION_EXPORTED, result_type, name, num_param, params, 0
 341         );
 342
 343         gen_proc -> gcc_func = gcc_func;
 344 }
 345
 346 // =======================================================================
 347 //   GENERATOR
 348 // =======================================================================
 349
 350 static gcc_jit_rvalue * rvalue_from_item(oberon_context_t * ctx, oberon_item_t * item);
 351 static gcc_jit_rvalue * rvalue_from_expr(oberon_context_t * ctx, oberon_expr_t * expr);
 352
 353 static int
 354 oberon_generator_get_type_size(oberon_context_t * ctx, oberon_type_t * type)
 355 {
 356         int size = 0;
 357         switch(type -> class)
 358         {
 359                 case OBERON_TYPE_INTEGER:
 360                         size = type -> size;
 361                         printf("int size: %i\n", size);
 362                         break;
 363                 case OBERON_TYPE_BOOLEAN:
 364                         size = sizeof(bool);
 365                         printf("bool size: %i\n", size);
 366                         break;
 367                 case OBERON_TYPE_PROCEDURE:
 368                 case OBERON_TYPE_POINTER:
 369                         size = sizeof(void*);
 370                         printf("ptr size: %i\n", size);
 371                         break;
 372                 case OBERON_TYPE_ARRAY:
 373                         size = type -> size;
 374                         type = type -> base;
 375                         size = (size == 0) ? (1) : (size);
 376                         size *= oberon_generator_get_type_size(ctx, type);
 377                         printf("array size: %i\n", size);
 378                         break;
 379                 case OBERON_TYPE_RECORD:
 380                         {
 381                                 int num = type -> num_decl;
 382                                 oberon_object_t * arg = type -> decl;
 383                                 for(int i = 0; i < num; i++)
 384                                 {
 385                                         oberon_type_t * x;
 386                                         x = arg -> type;
 387                                         size += oberon_generator_get_type_size(ctx, x);
 388                                         arg = arg -> next;
 389                                 }
 390                         }
 391                         printf("struct size: %i\n", size);
 392                         break;
 393                 default:
 394                         oberon_error(ctx, "oberon_generator_get_type_size: wat");
 395                         break;
 396         }
 397
 398         return size;
 399 }
 400
 401 void
 402 oberon_generate_begin_module(oberon_context_t * ctx)
 403 {
 404         gen_context_t * gen_context = ctx -> gen_context;
 405         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 406
 407         char name[256];
 408         snprintf(name, 256, "%s_BEGIN", ctx -> mod -> name);
 409
 410         gcc_jit_type * void_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_VOID);
 411         gcc_jit_function * func = gcc_jit_context_new_function(
 412                 gcc_context, NULL, GCC_JIT_FUNCTION_EXPORTED, void_type, name, 0, NULL, 0
 413         );
 414         gcc_jit_block * gcc_block = gcc_jit_function_new_block(func, NULL);
 415
 416         oberon_generator_open_block(gen_context, gcc_block);
 417 }
 418
 419 void
 420 oberon_generate_end_module(oberon_context_t * ctx)
 421 {
 422         gen_context_t * gen_context = ctx -> gen_context;
 423         gcc_jit_block * gcc_block = gen_context -> block -> gcc_block;
 424
 425         gcc_jit_block_end_with_void_return(gcc_block, NULL);
 426
 427         oberon_generator_close_block(gen_context);
 428 }
 429
 430 void
 431 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
 432 {
 433         gen_context_t * gen_context = ctx -> gen_context;
 434         gen_proc_t * gen_proc = proc -> gen_proc;
 435
 436         gcc_jit_function * func = gen_proc -> gcc_func;
 437         gcc_jit_block * gcc_block = gcc_jit_function_new_block(func, NULL);
 438
 439         oberon_generator_open_block(gen_context, gcc_block);
 440 }
 441
 442 void
 443 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
 444 {
 445         gen_context_t * gen_context = ctx -> gen_context;
 446         gen_block_t * gen_block = gen_context -> block;
 447         gcc_jit_block * block = gen_block -> gcc_block;
 448
 449         gcc_jit_rvalue * return_value;
 450         return_value = rvalue_from_expr(ctx, desig);
 451         gcc_jit_block_add_eval(block, NULL, return_value);
 452 }
 453
 454 void
 455 oberon_generate_end_proc(oberon_context_t * ctx)
 456 {
 457         gen_context_t * gen_context = ctx -> gen_context;
 458         oberon_generator_close_block(gen_context);
 459 }
 460
 461 void
 462 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
 463 {
 464         gen_context_t * gen_context = ctx -> gen_context;
 465         gen_block_t * gen_block = gen_context -> block;
 466         gcc_jit_block * gcc_block = gen_block -> gcc_block;
 467
 468         if(expr == NULL)
 469         {
 470                 gcc_jit_block_end_with_void_return(gcc_block, NULL);
 471         }
 472         else
 473         {
 474                 gcc_jit_rvalue * r = rvalue_from_expr(ctx, expr);
 475                 gcc_jit_block_end_with_return(gcc_block, NULL, r);
 476         }
 477 }
 478
 479 static gcc_jit_lvalue *
 480 lvalue_from_item(oberon_context_t * ctx, oberon_item_t * item)
 481 {
 482         gen_context_t * gen_context = ctx -> gen_context;
 483         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 484
 485         gcc_jit_lvalue * left;
 486
 487         if(item -> mode == MODE_VAR)
 488         {
 489                 if(item -> var -> class == OBERON_CLASS_PROC)
 490                 {
 491                         oberon_error(ctx, "casting static procedure to pointer not supported by generator");
 492                 }
 493
 494                 gen_var_t * gen_var = item -> var -> gen_var;
 495                 left = gen_var -> gcc_lvalue;
 496                 if(item -> var -> class == OBERON_CLASS_VAR_PARAM)
 497                 {
 498                         gcc_jit_rvalue * r = gcc_jit_lvalue_as_rvalue(left);
 499                         left = gcc_jit_rvalue_dereference(r, NULL);
 500                 }
 501         }
 502         else if(item -> mode == MODE_INDEX)
 503         {
 504                 assert(item -> num_args == 1);
 505                 gcc_jit_rvalue * parent = rvalue_from_item(ctx, item -> parent);
 506                 gcc_jit_rvalue * index = rvalue_from_expr(ctx, item -> args);
 507                 left = gcc_jit_context_new_array_access(gcc_context, NULL, parent, index);
 508         }
 509         else if(item -> mode == MODE_FIELD)
 510         {
 511                 printf("lvalue_from_item: %s\n", item -> var -> name);
 512                 gen_var_t * gen_var = item -> var -> gen_var;
 513                 gcc_jit_field * gcc_field = gen_var -> gcc_field;
 514
 515                 gcc_jit_lvalue * parent = lvalue_from_item(ctx, item -> parent);
 516                 left = gcc_jit_lvalue_access_field(parent, NULL, gcc_field);
 517         }
 518         else if(item -> mode == MODE_DEREF)
 519         {
 520                 gcc_jit_rvalue * parent = rvalue_from_item(ctx, item -> parent);
 521                 left = gcc_jit_rvalue_dereference(parent, NULL);
 522         }
 523         else
 524         {
 525                 oberon_error(ctx, "lvalue_from_item: invalid mode %i", item -> mode);
 526         }
 527
 528         return left;
 529 }
 530
 531 static gcc_jit_lvalue *
 532 lvalue_from_expr(oberon_context_t *ctx, oberon_expr_t * expr)
 533 {
 534         gcc_jit_lvalue * left;
 535         oberon_item_t * item;
 536
 537         if(expr -> is_item)
 538         {
 539                 item = (oberon_item_t *) expr;
 540                 left = lvalue_from_item(ctx, item);
 541         }
 542         else
 543         {
 544                 oberon_error(ctx, "invalid lvalue expression");
 545         }
 546
 547         return left;
 548 }
 549
 550 static gcc_jit_rvalue *
 551 rvalue_from_item(oberon_context_t * ctx, oberon_item_t * item)
 552 {
 553         gen_context_t * gen_context = ctx -> gen_context;
 554         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 555
 556         gcc_jit_rvalue * right;
 557         if(item -> mode == MODE_VAR)
 558         {
 559                 gcc_jit_lvalue * left = lvalue_from_item(ctx, item);
 560                 right = gcc_jit_lvalue_as_rvalue(left);
 561         }
 562         else if(item -> mode == MODE_INTEGER)
 563         {
 564                 gcc_jit_type * int_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_INT);
 565                 right = gcc_jit_context_new_rvalue_from_int(gcc_context, int_type, item -> integer);
 566         }
 567         else if(item -> mode == MODE_BOOLEAN)
 568         {
 569                 gcc_jit_type * bool_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_BOOL);
 570                 if(item -> boolean)
 571                 {
 572                         right = gcc_jit_context_one(gcc_context, bool_type);
 573                 }
 574                 else
 575                 {
 576                         right = gcc_jit_context_zero(gcc_context, bool_type);
 577                 }
 578         }
 579         else if(item -> mode == MODE_CALL)
 580         {
 581                 oberon_type_t * signature = item -> var -> type;
 582                 gen_proc_t * gen_proc = item -> var -> gen_proc;
 583
 584                 int num_args = item -> num_args;
 585                 gcc_jit_rvalue *args[num_args];
 586
 587                 oberon_expr_t * expr = item -> args;
 588                 oberon_object_t * arg_param = signature -> decl;
 589                 for(int i = 0; i < num_args; i++)
 590                 {
 591                         if(arg_param -> class == OBERON_CLASS_VAR_PARAM)
 592                         {
 593                                 gcc_jit_lvalue * left = lvalue_from_expr(ctx, expr);
 594                                 args[i] = gcc_jit_lvalue_get_address(left, NULL);
 595                         }
 596                         else
 597                         {
 598                                 args[i] = rvalue_from_expr(ctx, expr);
 599                         }
 600                         expr = expr -> next;
 601                         arg_param = arg_param -> next;
 602                 }
 603
 604                 gcc_jit_rvalue * fnptr;
 605                 gcc_jit_function * func;
 606                 switch(item -> var -> class)
 607                 {
 608                         case OBERON_CLASS_PROC:
 609                                 func = gen_proc -> gcc_func;
 610                                 right = gcc_jit_context_new_call(
 611                                         gcc_context, NULL, func, num_args, args
 612                                 );
 613                                 break;
 614                         case OBERON_CLASS_VAR:
 615                         case OBERON_CLASS_VAR_PARAM:
 616                         case OBERON_CLASS_PARAM:
 617                                 fnptr = gcc_jit_lvalue_as_rvalue(item -> var -> gen_var -> gcc_lvalue);
 618                                 right = gcc_jit_context_new_call_through_ptr(
 619                                         gcc_context, NULL, fnptr, num_args, args
 620                                 );
 621                                 break;
 622                         default:
 623                                 assert(0);
 624                                 break;
 625                 }
 626         }
 627         else if(item -> mode == MODE_INDEX)
 628         {
 629                 gcc_jit_lvalue * left = lvalue_from_item(ctx, item);
 630                 right = gcc_jit_lvalue_as_rvalue(left);
 631         }
 632         else if(item -> mode == MODE_FIELD)
 633         {
 634                 gen_var_t * gen_var = item -> var -> gen_var;
 635                 gcc_jit_field * gcc_field = gen_var -> gcc_field;
 636
 637                 gcc_jit_rvalue * parent = rvalue_from_item(ctx, item -> parent);
 638                 right = gcc_jit_rvalue_access_field(parent, NULL, gcc_field);
 639         }
 640         else if(item -> mode == MODE_DEREF)
 641         {
 642                 gcc_jit_lvalue * left = lvalue_from_item(ctx, item);
 643                 right = gcc_jit_lvalue_as_rvalue(left);
 644         }
 645         else if(item -> mode == MODE_NIL)
 646         {
 647                 gcc_jit_type * type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_VOID_PTR);
 648                 right = gcc_jit_context_null(gcc_context, type);
 649         }
 650         else if(item -> mode == MODE_NEW)
 651         {
 652                 assert(item -> result -> class == OBERON_TYPE_POINTER);
 653
 654                 oberon_type_t * type = item -> result -> base;
 655                 int type_size = oberon_generator_get_type_size(ctx, type);
 656                 int array_size = type_size;
 657
 658                 int num = item -> num_args;
 659                 oberon_expr_t * arg = item -> args;
 660                 for(int i = 0; i < num; i++)
 661                 {
 662                         array_size *= arg -> item.integer;
 663                         arg = arg -> next;
 664                 }
 665
 666                 gcc_jit_type * size_type;
 667                 size_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_SIZE_T);
 668
 669                 gcc_jit_rvalue * fnarg;
 670                 fnarg = gcc_jit_context_new_rvalue_from_int(gcc_context, size_type, array_size);
 671
 672                 gcc_jit_type * result_type = item -> result -> gen_type -> gcc_type;
 673                 gcc_jit_rvalue * gcc_alloc = gcc_jit_lvalue_as_rvalue(gen_context -> gcc_alloc);
 674                 right = gcc_jit_context_new_call_through_ptr(gcc_context, NULL, gcc_alloc, 1, &fnarg);
 675                 right = gcc_jit_context_new_cast(gcc_context, NULL, right, result_type);
 676         }
 677         else if(item -> mode == MODE_REAL)
 678         {
 679                 gcc_jit_type * int_type = gcc_jit_context_get_type(gcc_context, GCC_JIT_TYPE_FLOAT);
 680                 right = gcc_jit_context_new_rvalue_from_int(gcc_context, int_type, item -> real);
 681         }
 682         else
 683         {
 684                 oberon_error(ctx, "rvalue_from_item: invalid mode %i", item -> mode);
 685         }
 686
 687         return right;
 688 }
 689
 690 struct {
 691         int type; // 0 - unary, 1 - binary, 2 - comp
 692         union {
 693                 enum gcc_jit_unary_op unary_op;
 694                 enum gcc_jit_binary_op binary_op;
 695                 enum gcc_jit_comparison comp_op;
 696         };
 697 } op_table[] = {
 698         { 0, .unary_op = GCC_JIT_UNARY_OP_MINUS },
 699         { 0, .unary_op = GCC_JIT_UNARY_OP_BITWISE_NEGATE },
 700         { 0, .unary_op = GCC_JIT_UNARY_OP_LOGICAL_NEGATE },
 701         { 0, .unary_op = GCC_JIT_UNARY_OP_ABS },
 702
 703         { 1, .binary_op = GCC_JIT_BINARY_OP_PLUS },
 704         { 1, .binary_op = GCC_JIT_BINARY_OP_MINUS },
 705         { 1, .binary_op = GCC_JIT_BINARY_OP_MULT },
 706         { 1, .binary_op = GCC_JIT_BINARY_OP_DIVIDE },
 707         { 1, .binary_op = GCC_JIT_BINARY_OP_MODULO },
 708         { 1, .binary_op = GCC_JIT_BINARY_OP_BITWISE_AND },
 709         { 1, .binary_op = GCC_JIT_BINARY_OP_BITWISE_XOR },
 710         { 1, .binary_op = GCC_JIT_BINARY_OP_BITWISE_OR },
 711         { 1, .binary_op = GCC_JIT_BINARY_OP_LOGICAL_AND },
 712         { 1, .binary_op = GCC_JIT_BINARY_OP_LOGICAL_OR },
 713
 714         { 2, .comp_op = GCC_JIT_COMPARISON_EQ },
 715         { 2, .comp_op = GCC_JIT_COMPARISON_NE },
 716         { 2, .comp_op = GCC_JIT_COMPARISON_LT },
 717         { 2, .comp_op = GCC_JIT_COMPARISON_LE },
 718         { 2, .comp_op = GCC_JIT_COMPARISON_GT },
 719         { 2, .comp_op = GCC_JIT_COMPARISON_GE }
 720 };
 721
 722 static gcc_jit_rvalue *
 723 rvalue_from_operator(oberon_context_t * ctx, oberon_oper_t * operator)
 724 {
 725         gcc_jit_rvalue * right;
 726
 727         gen_context_t * gen_context = ctx -> gen_context;
 728         gen_type_t * gen_type = operator -> result -> gen_type;
 729         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 730         gcc_jit_type * result_type = gen_type -> gcc_type;
 731
 732         int expr_type = op_table[operator -> op].type;
 733         if(expr_type == 0)
 734         {
 735                 enum gcc_jit_unary_op op = op_table[operator -> op].unary_op;
 736                 gcc_jit_rvalue * l = rvalue_from_expr(ctx, operator -> left);
 737                 right = gcc_jit_context_new_unary_op(gcc_context, NULL, op, result_type, l);
 738         }
 739         else if(expr_type == 1)
 740         {
 741                 enum gcc_jit_unary_op op = op_table[operator -> op].binary_op;
 742                 gcc_jit_rvalue * l = rvalue_from_expr(ctx, operator -> left);
 743                 gcc_jit_rvalue * r = rvalue_from_expr(ctx, operator -> right);
 744                 right = gcc_jit_context_new_binary_op(gcc_context, NULL, op, result_type, l, r);
 745         }
 746         else if(expr_type == 2)
 747         {
 748                 enum gcc_jit_comparison op = op_table[operator -> op].comp_op;
 749                 gcc_jit_rvalue * l = rvalue_from_expr(ctx, operator -> left);
 750                 gcc_jit_rvalue * r = rvalue_from_expr(ctx, operator -> right);
 751                 right = gcc_jit_context_new_comparison(gcc_context, NULL, op, l, r);
 752         }
 753         else
 754         {
 755                 oberon_error(ctx, "rvalue_from_operator: wat");
 756         }
 757
 758         return right;
 759 }
 760
 761 static gcc_jit_rvalue *
 762 rvalue_from_expr(oberon_context_t * ctx, oberon_expr_t * expr)
 763 {
 764         gcc_jit_rvalue * right;
 765
 766         if(expr -> is_item)
 767         {
 768                 oberon_item_t * item = (oberon_item_t *) expr;
 769                 right = rvalue_from_item(ctx, item);
 770         }
 771         else
 772         {
 773                 oberon_oper_t * operator = (oberon_oper_t *) expr;
 774                 right = rvalue_from_operator(ctx, operator);
 775         }
 776
 777         return right;
 778 }
 779
 780 void
 781 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
 782 {
 783         gcc_jit_lvalue * left;
 784         left = lvalue_from_expr(ctx, dst);
 785
 786         gcc_jit_rvalue * right;
 787         right = rvalue_from_expr(ctx, src);
 788
 789         if(src -> is_item)
 790         {
 791                 if(src -> item.mode == MODE_NIL)
 792                 {
 793                         gen_context_t * gen_context = ctx -> gen_context;
 794                         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 795                         gen_type_t * gen_type = dst -> result -> gen_type;
 796                         gcc_jit_type * cast_to_type = gen_type -> gcc_type;
 797                         right = gcc_jit_context_new_cast(gcc_context, NULL, right, cast_to_type);
 798                 }
 799         }
 800
 801         printf("oberon_generate_assign: class %i := class %i\n", dst -> result -> class, src -> result -> class);
 802
 803         gen_context_t * gen_context = ctx -> gen_context;
 804         gen_block_t * gen_block = gen_context -> block;
 805         gcc_jit_block * gcc_block = gen_block -> gcc_block;
 806         gcc_jit_block_add_assignment(gcc_block, NULL, left, right);
 807 }
 808
 809 void
 810 oberon_generate_code(oberon_context_t * ctx)
 811 {
 812         gen_context_t * gen_context = ctx -> gen_context;
 813         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 814
 815         gcc_jit_result * gcc_result;
 816         gcc_result = gcc_jit_context_compile(gcc_context);
 817
 818         gen_context -> gcc_result = gcc_result;
 819
 820         typedef void * (*TOberonAlloc)(size_t);
 821         TOberonAlloc * fn_alloc_ptr = gcc_jit_result_get_global(gcc_result, "__OBERON_ALLOC__");
 822         *fn_alloc_ptr = __OBERON_ALLOC__;
 823
 824 //      ctx -> mod -> begin = gcc_jit_result_get_code(gcc_result, "BEGIN");
 825 }
 826
 827 void
 828 oberon_generator_dump(oberon_context_t * ctx, char * path)
 829 {
 830         gen_context_t * gen_context = ctx -> gen_context;
 831         gcc_jit_context * gcc_context = gen_context -> gcc_context;
 832         gcc_jit_context_dump_to_file(gcc_context, path, 0);
 833 }
 834
 835 void *
 836 oberon_generator_get_procedure(oberon_context_t * ctx, const char * name)
 837 {
 838         gen_context_t * gen_context = ctx -> gen_context;
 839         gcc_jit_result * gcc_result = gen_context -> gcc_result;
 840
 841         return gcc_jit_result_get_code(gcc_result, name);
 842 }
 843
 844 void *
 845 oberon_generator_get_var(oberon_context_t * ctx, const char * name)
 846 {
 847         gen_context_t * gen_context = ctx -> gen_context;
 848         gcc_jit_result * gcc_result = gen_context -> gcc_result;
 849
 850         return gcc_jit_result_get_global(gcc_result, name);
 851 }