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JVM: Реализованы локальные процедуры (без доступа к локальным переменным уровнем...
[dsw-obn.git] / src / backends / jvm / generator-jvm.c
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <stdarg.h>
4 #include <stdint.h>
5 #include <stdbool.h>
6 #include <string.h>
7 #include <assert.h>
8
9 #include <gc.h>
10
11 #include "../../../include/oberon.h"
12 #include "../../oberon-internals.h"
13 #include "generator-jvm.h"
14 #include "generator-jvm-abi.h"
15 #include "generator-jvm-asm.h"
16 #include "generator-jvm-basic.h"
17
18 static void
19 push_item(gen_proc_t * p, oberon_item_t * item);
20
21 static void
22 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num);
23
24 /*
25 * Генерирует код для инициализации массива со статическим базовым типом
26 * ( aref -- )
27 */
28
29 static void
30 jvm_generate_array_initialization(gen_proc_t * p, oberon_type_t * arr)
31 {
32 int dim = 0;
33 oberon_type_t * base = arr;
34 while(base -> class == OBERON_TYPE_ARRAY)
35 {
36 dim += 1;
37 base = base -> base;
38 }
39
40 if(base -> class != OBERON_TYPE_RECORD)
41 {
42 jvm_generate(p, 1, 0, "pop");
43 return;
44 }
45
46 struct {
47 int reg_index;
48 int reg_length;
49 int start;
50 int end;
51 } loop[dim];
52
53 int reg_dst;
54 reg_dst = jvm_alloc_register_untyped(p -> rf, false);
55 jvm_generate(p, 1, 0, "astore %i", reg_dst);
56
57 /*
58 * Входящие параметры заграблены.
59 * Теперь генерируем эквивалентный код:
60 * int i = 0;
61 * int len = dst.length
62 * while(i < len)
63 * {
64 * ...
65 * {
66 * dst[i, ...] = new record;
67 * }
68 * ...
69 * i += 1;
70 * }
71 * Где "..." такой же код (начало и конец) для следующей размерности.
72 */
73
74 for(int i = 0; i < dim; i++)
75 {
76 loop[i].reg_index = jvm_alloc_register_untyped(p -> rf, false);
77 loop[i].reg_length = jvm_alloc_register_untyped(p -> rf, false);
78 loop[i].start = jvm_new_label_id(p);
79 loop[i].end = jvm_new_label_id(p);
80
81 jvm_generate(p, 0, 1, "iconst_0");
82 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_index);
83
84 jvm_generate(p, 0, 1, "aload %i", reg_dst);
85 jvm_generate(p, 1, 1, "arraylength");
86 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_length);
87
88 /* if(i >= len) goto end; */
89 jvm_generate_label(p, loop[i].start);
90 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
91 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_length);
92 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
93 }
94
95 jvm_generate(p, 0, 1, "aload %i", reg_dst);
96 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
97 for(int i = 1; i < dim; i++)
98 {
99 jvm_generate(p, 2, 1, "aaload");
100 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
101 }
102 jvm_generate_new(p, base, 0);
103 jvm_generate(p, 3, 0, "aastore");
104
105 for(int i = dim - 1; i >= 0; i--)
106 {
107 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].reg_index);
108 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
109 jvm_generate_label(p, loop[i].end);
110 }
111 }
112
113 static void
114 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num)
115 {
116 int dim;
117 char * cname;
118 char * desc;
119 oberon_type_t * base;
120
121 switch(type -> class)
122 {
123 case OBERON_TYPE_INTEGER:
124 case OBERON_TYPE_BOOLEAN:
125 case OBERON_TYPE_PROCEDURE:
126 case OBERON_TYPE_REAL:
127 case OBERON_TYPE_POINTER:
128 gen_error("jvm_generate_new_static: static alocation not allowed");
129 break;
130 case OBERON_TYPE_RECORD:
131 assert(num == 0);
132 cname = jvm_get_class_full_name(type);
133 jvm_generate(p, 0, 1, "new %s", cname);
134 jvm_generate(p, 1, 2, "dup");
135 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", cname);
136 break;
137 case OBERON_TYPE_ARRAY:
138 dim = 0;
139 base = type;
140 desc = jvm_get_descriptor(type);
141 while(base -> class == OBERON_TYPE_ARRAY)
142 {
143 if(num > 0)
144 {
145 assert(base -> size == 0);
146 num -= 1;
147 }
148 else
149 {
150 assert(base -> size > 0);
151 jvm_generate_push_int(p, base -> size);
152 }
153 dim += 1;
154 base = base -> base;
155 }
156
157 assert(num == 0);
158 jvm_generate(p, dim, 1, "multianewarray %s %i", desc, dim);
159 jvm_generate(p, 1, 2, "dup");
160 jvm_generate_array_initialization(p, type);
161 break;
162 default:
163 gen_error("jvm_generate_new_static: unk type class %i", type -> class);
164 break;
165 }
166 }
167
168 /*
169 * Генерирует код для копирования полей из первой записи во вторую.
170 * ( aref_dst aref_src -- )
171 * dst := src;
172 */
173
174 static void
175 jvm_generate_copy_record(gen_proc_t * p, oberon_type_t * rec)
176 {
177 assert(rec -> class == OBERON_TYPE_RECORD);
178 char * desc = jvm_get_descriptor(rec);
179 char * cname = jvm_get_class_full_name(rec);
180 jvm_generate(p, 1 + 1, 0, "invokestatic %s/$COPY$(%s%s)V", cname, desc, desc);
181 }
182
183 /*
184 * Генерирует кода для копирования массивов.
185 * ( aref_dst aref_src -- )
186 * dst := src;
187 */
188
189 static void
190 jvm_generate_copy_array(gen_proc_t * p, oberon_type_t * arr)
191 {
192 int dim = 0;
193 oberon_type_t * base = arr;
194 while(base -> class == OBERON_TYPE_ARRAY)
195 {
196 dim += 1;
197 base = base -> base;
198 }
199
200 struct {
201 int reg_index;
202 int reg_length;
203 int start;
204 int end;
205 } loop[dim];
206
207 int reg_dst = jvm_alloc_register_untyped(p -> rf, false);
208 int reg_src = jvm_alloc_register_untyped(p -> rf, false);
209 jvm_generate(p, 1, 0, "astore %i", reg_src);
210 jvm_generate(p, 1, 0, "astore %i", reg_dst);
211
212 /*
213 * Входящие параметры заграблены.
214 * Теперь генерируем эквивалентный код:
215 * int i = 0;
216 * int len = src.length
217 * while(i < len)
218 * {
219 * ...
220 * {
221 * copy from src[i, ...] to dst[i, ...];
222 * }
223 * ...
224 * i += 1;
225 * }
226 * Где "..." такой же код (начало и конец) для следующей размерности.
227 */
228
229 for(int i = 0; i < dim; i++)
230 {
231 loop[i].reg_index = jvm_alloc_register_untyped(p -> rf, false);
232 loop[i].reg_length = jvm_alloc_register_untyped(p -> rf, false);
233 loop[i].start = jvm_new_label_id(p);
234 loop[i].end = jvm_new_label_id(p);
235
236 jvm_generate(p, 0, 1, "iconst_0");
237 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_index);
238
239 jvm_generate(p, 0, 1, "aload %i", reg_src);
240 jvm_generate(p, 1, 1, "arraylength");
241 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_length);
242
243 /* if(i >= len) goto end; */
244 jvm_generate_label(p, loop[i].start);
245 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
246 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_length);
247 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
248 }
249
250 if(base -> class == OBERON_TYPE_RECORD)
251 {
252 /* Получаем записи по индексам ( -- dst src ) */
253
254 jvm_generate(p, 0, 1, "aload %i", reg_dst);
255 for(int i = 0; i < dim; i++)
256 {
257 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
258 jvm_generate(p, 2, 1, "aaload");
259 }
260
261 jvm_generate(p, 0, 1, "aload %i", reg_src);
262 for(int i = 0; i < dim; i++)
263 {
264 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
265 jvm_generate(p, 2, 1, "aaload");
266 }
267
268 /* Копируем записи ( dst src -- ) */
269 jvm_generate_copy_record(p, base);
270 }
271 else
272 {
273 char postfix = jvm_get_postfix(base);
274 int cell_size = jvm_cell_size_for_postfix(postfix);
275
276 /* Получаем массивы и индексы ( -- dst i src i ) */
277
278 jvm_generate(p, 0, 1, "aload %i", reg_dst);
279 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
280 for(int i = 1; i < dim; i++)
281 {
282 jvm_generate(p, 2, 1, "aaload");
283 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
284 }
285
286 jvm_generate(p, 0, 1, "aload %i", reg_src);
287 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
288 for(int i = 1; i < dim; i++)
289 {
290 jvm_generate(p, 2, 1, "aaload");
291 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
292 }
293
294 /* Копируем значения ( dst i src i -- ) */
295 jvm_generate(p, 2, cell_size, "%caload", postfix);
296 jvm_generate(p, 2 + cell_size, 0, "%castore", postfix);
297 }
298
299 for(int i = dim - 1; i >= 0; i--)
300 {
301 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].reg_index);
302 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
303 jvm_generate_label(p, loop[i].end);
304 }
305 }
306
307 static void
308 jvm_generate_push_procedure_pointer(gen_proc_t * p, oberon_object_t * proc)
309 {
310 char * full_name = jvm_get_field_full_name_safe(proc);
311 char * desc = jvm_get_descriptor(proc -> type);
312 jvm_generate(p, 0, 1, "getstatic %s/pointer %s", full_name, desc);
313 }
314
315 void
316 oberon_generator_init_context(oberon_context_t * ctx)
317 {
318 gen_context_t * gen_context = GC_MALLOC(sizeof *gen_context);
319 memset(gen_context, 0, sizeof *gen_context);
320
321 ctx -> gen_context = gen_context;
322 }
323
324 void
325 oberon_generator_destroy_context(oberon_context_t * ctx)
326 {
327 }
328
329 static void
330 oberon_generate_procedure_class(oberon_type_t * proc)
331 {
332 FILE * fp;
333 char * cname;
334 char * signature;
335 struct gen_class * class;
336
337 cname = jvm_get_class_full_name(proc);
338 class = jvm_create_class(cname);
339 fp = class -> fp;
340
341 fprintf(fp, ".source SYSTEM\n");
342 fprintf(fp, ".class public abstract %s\n", cname);
343 fprintf(fp, ".super java/lang/Object\n\n");
344
345 fprintf(fp, ".method <init>()V\n");
346 fprintf(fp, " aload_0\n");
347 fprintf(fp, " invokespecial java/lang/Object/<init>()V\n");
348 fprintf(fp, " return\n");
349 fprintf(fp, ".end method\n\n");
350
351 signature = jvm_get_procedure_signature(proc);
352
353 fprintf(fp, ".method public abstract invoke%s\n", signature);
354 fprintf(fp, ".end method\n\n");
355
356 jvm_destroy_class(class);
357 }
358
359 static void
360 oberon_generate_procedure_pointer_class(oberon_object_t * proc)
361 {
362 FILE * fp;
363 char * cname;
364 char * abscname;
365 char * absdesc;
366 char * signature;
367 struct gen_class * class;
368
369 cname = jvm_get_field_full_name_safe(proc);
370 class = jvm_create_class(cname);
371 abscname = jvm_get_class_full_name(proc -> type);
372 absdesc = jvm_get_descriptor(proc -> type);
373 fp = class -> fp;
374
375 fprintf(fp, ".source %s\n", proc -> module -> name);
376 fprintf(fp, ".class public %s\n", cname);
377 fprintf(fp, ".super %s\n\n", abscname);
378
379 fprintf(fp, ".field public static pointer %s\n\n", absdesc);
380
381 fprintf(fp, ".method <init>()V\n");
382 fprintf(fp, " aload_0\n");
383 fprintf(fp, " invokespecial %s/<init>()V\n", abscname);
384 fprintf(fp, " return\n");
385 fprintf(fp, ".end method\n\n");
386
387 fprintf(fp, ".method static <clinit>()V\n");
388 fprintf(fp, " .limit stack 2\n");
389 fprintf(fp, " new %s\n", cname);
390 fprintf(fp, " dup\n");
391 fprintf(fp, " invokespecial %s/<init>()V\n", cname);
392 fprintf(fp, " putstatic %s/pointer %s\n", cname, absdesc);
393 fprintf(fp, " return\n");
394 fprintf(fp, ".end method\n\n");
395
396 signature = jvm_get_procedure_signature(proc -> type);
397
398 gen_proc_t * p = jvm_create_proc(class);
399 jvm_generate_function_header(p, "public", "invoke", signature);
400 jvm_alloc_register_untyped(p -> rf, false);
401
402 int use_size = 0;
403 int num = proc -> type -> num_decl;
404 oberon_object_t * param = proc -> type -> decl;
405 for(int i = 0; i < num; i++)
406 {
407 gen_type_t * t = param -> type -> gen_type;
408 if(param -> class == OBERON_CLASS_VAR_PARAM)
409 {
410 int reg = jvm_alloc_register_untyped(p -> rf, true);
411 jvm_generate(p, 0, 1, "aload %i", reg);
412 jvm_generate(p, 0, 1, "iload %i", reg + 1);
413 }
414 else
415 {
416 int reg = jvm_alloc_register_untyped(p -> rf, t -> wide);
417 jvm_generate(p, 0, t -> cell_size, "%cload %i", t -> prefix, reg);
418 }
419 use_size += t -> cell_size;
420 param = param -> next;
421 }
422
423
424 char * full_name = jvm_get_field_full_name(proc);
425 int cell_size = jvm_cell_size_for_type(proc -> type -> base);
426 jvm_generate(p, use_size, cell_size, "invokestatic %s%s", full_name, signature);
427
428 if(proc -> type -> base -> class == OBERON_TYPE_VOID)
429 {
430 jvm_generate(p, 0, 0, "return");
431 }
432 else
433 {
434 char prefix = jvm_get_prefix(proc -> type -> base);
435 jvm_generate(p, cell_size, 0, "%creturn", prefix);
436 }
437
438 jvm_generate_function_end(p);
439
440 jvm_destroy_class(class);
441 }
442
443 static void
444 oberon_generate_record_class(gen_module_t * m, oberon_type_t * rec)
445 {
446 char * cname;
447 struct gen_class * class;
448
449 /* Устанавливаем новоый id */
450 rec -> gen_type -> rec_id = m -> rec_id;
451 m -> rec_id += 1;
452
453 cname = jvm_get_class_full_name(rec);
454 class = jvm_create_class(cname);
455
456 fprintf(class -> fp, ".source %s\n", rec -> module -> name);
457 fprintf(class -> fp, ".class public %s\n", cname);
458
459 if(rec -> base == NULL)
460 {
461 fprintf(class -> fp, ".super java/lang/Object\n\n");
462 }
463 else
464 {
465 class -> base = rec -> base -> gen_type -> class;
466 fprintf(class -> fp, ".super %s\n\n", class -> base -> full_name);
467 }
468
469 rec -> gen_type -> class = class;
470 }
471
472 void
473 oberon_generator_init_type(oberon_context_t * ctx, oberon_type_t * type)
474 {
475 gen_type_t * t = GC_MALLOC(sizeof *t);
476 memset(t, 0, sizeof *t);
477 type -> gen_type = t;
478
479 if(type -> class != OBERON_TYPE_VOID)
480 {
481 t -> wide = jvm_is_wide_type(type);
482 t -> prefix = jvm_get_prefix(type);
483 t -> postfix = jvm_get_postfix(type);
484 }
485 t -> cell_size = jvm_cell_size_for_type(type);
486 t -> desc = jvm_get_descriptor(type);
487
488 switch(type -> class)
489 {
490 case OBERON_TYPE_VOID:
491 case OBERON_TYPE_INTEGER:
492 case OBERON_TYPE_BOOLEAN:
493 case OBERON_TYPE_ARRAY:
494 case OBERON_TYPE_POINTER:
495 case OBERON_TYPE_REAL:
496 case OBERON_TYPE_CHAR:
497 case OBERON_TYPE_STRING:
498 case OBERON_TYPE_SET:
499 break;
500 case OBERON_TYPE_RECORD:
501 ;
502 gen_module_t * m;
503 m = type -> module -> gen_mod;
504 oberon_generate_record_class(m, type);
505 break;
506 case OBERON_TYPE_PROCEDURE:
507 oberon_generate_procedure_class(type);
508 break;
509 default:
510 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
511 break;
512 }
513 }
514
515 void
516 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
517 {
518 struct gen_class * class;
519 class = rec -> gen_type -> class;
520
521 int num = rec -> num_decl;
522 oberon_object_t * field = rec -> decl;
523 for(int i = 0; i < num; i++)
524 {
525 char * name = field -> name;
526 gen_var_t * v = field -> gen_var;
527 gen_type_t * t = field -> type -> gen_type;
528 jvm_generate_and_init_field(class, v, name, t);
529 field = field -> next;
530 }
531
532 /* Стандартный конструктор класса */
533 /* Инициализирует внутренние статические записи и массивы */
534 gen_proc_t * p = jvm_create_proc(class);
535 jvm_generate_function_header(p, "public", "<init>", "()V");
536 jvm_alloc_register_untyped(p -> rf, false);
537 jvm_generate(p, 0, 1, "aload_0");
538 if(class -> base)
539 {
540 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
541 }
542 else
543 {
544 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
545 }
546 num = rec -> num_decl;
547 field = rec -> decl;
548 for(int i = 0; i < num; i++)
549 {
550 jvm_generate(p, 0, 1, "aload_0");
551 jvm_generate_variable_initialization(p, field -> gen_var);
552
553 if(field -> type -> class == OBERON_TYPE_RECORD
554 || field -> type -> class == OBERON_TYPE_ARRAY)
555 {
556 jvm_generate(p, 0, 1, "aload_0");
557 jvm_generate_ldst_prepare(p, field -> gen_var);
558 jvm_generate_new(p, field -> type, 0);
559 jvm_generate_store(p, field -> gen_var);
560 }
561 field = field -> next;
562 }
563 jvm_generate(p, 0, 0, "return");
564 jvm_generate_function_end(p);
565
566 /* Метод для копирования полей класса */
567 /* reg0 == src -> reg1 == dst */
568 p = jvm_create_proc(class);
569 gen_var_t * copy_dst = oberon_generator_new_var();
570 gen_var_t * copy_src = oberon_generator_new_var();
571 char * signature = new_string("(%s%s)V", rec -> gen_type -> desc, rec -> gen_type -> desc);
572 jvm_generate_function_header(p, "public static", "$COPY$", signature);
573 jvm_init_param(p, copy_dst, rec -> gen_type);
574 jvm_init_param(p, copy_src, rec -> gen_type);
575 jvm_generate_param_initialization(p, copy_dst, "dst");
576 jvm_generate_param_initialization(p, copy_src, "src");
577 num = rec -> num_decl;
578 field = rec -> decl;
579 for(int i = 0; i < num; i++)
580 {
581 if(field -> type -> class == OBERON_TYPE_RECORD)
582 {
583 jvm_generate_load(p, copy_dst);
584 jvm_generate_load(p, field -> gen_var);
585 jvm_generate_load(p, copy_src);
586 jvm_generate_load(p, field -> gen_var);
587 jvm_generate_copy_record(p, field -> type);
588 }
589 else if(field -> type -> class == OBERON_TYPE_ARRAY)
590 {
591 jvm_generate_load(p, copy_dst);
592 jvm_generate_load(p, field -> gen_var);
593 jvm_generate_load(p, copy_src);
594 jvm_generate_load(p, field -> gen_var);
595 jvm_generate_copy_array(p, field -> type);
596 }
597 else
598 {
599 jvm_generate_load(p, copy_dst);
600 jvm_generate_ldst_prepare(p, field -> gen_var);
601 jvm_generate_load(p, copy_src);
602 jvm_generate_load(p, field -> gen_var);
603 jvm_generate_store(p, field -> gen_var);
604 }
605 field = field -> next;
606 }
607 jvm_generate(p, 0, 0, "return");
608 jvm_generate_function_end(p);
609
610 jvm_destroy_class(class);
611 }
612
613 void
614 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
615 {
616 gen_var_t * v = oberon_generator_new_var();
617 var -> gen_var = v;
618
619 gen_module_t * m;
620 m = ctx -> mod -> gen_mod;
621
622 struct gen_class * class;
623 class = m -> class;
624
625 gen_proc_t * p;
626 switch(var -> class)
627 {
628 case OBERON_CLASS_VAR_PARAM:
629 p = var -> parent -> gen_proc;
630 jvm_init_var_param(p, v, var -> type -> gen_type);
631 break;
632 case OBERON_CLASS_PARAM:
633 p = var -> parent -> gen_proc;
634 jvm_init_param(p, v, var -> type -> gen_type);
635 break;
636 case OBERON_CLASS_FIELD:
637 /* Заполняются при инициализации структуры */
638 /* смотри oberon_generator_init_record() */
639 break;
640 case OBERON_CLASS_VAR:
641 if(var -> local)
642 {
643 p = var -> parent -> gen_proc;
644 jvm_init_named_local_var(p, v, var -> type -> gen_type);
645 }
646 else
647 {
648 jvm_generate_and_init_global_var(class, v, var -> name, var -> type -> gen_type);
649 }
650 break;
651 default:
652 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
653 break;
654 }
655 }
656
657 void
658 oberon_generator_init_temp_var(oberon_context_t * ctx, oberon_object_t * var)
659 {
660 assert(var -> class == OBERON_CLASS_VAR);
661
662 gen_var_t * v = oberon_generator_new_var();
663 var -> gen_var = v;
664
665 gen_module_t * m;
666 m = ctx -> mod -> gen_mod;
667
668 gen_proc_t * p;
669 p = m -> class -> p;
670
671 jvm_generate_and_init_local_var(p, v, var -> type -> gen_type);
672 }
673
674 void
675 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
676 {
677 struct gen_class * class = proc -> module -> gen_mod -> class;
678 proc -> gen_proc = jvm_create_proc(class);
679 }
680
681 void
682 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
683 {
684 gen_module_t * m = GC_MALLOC(sizeof *m);
685 memset(m, 0, sizeof *m);
686 mod -> gen_mod = m;
687
688 struct gen_class * class;
689 class = jvm_create_class(mod -> name);
690
691 fprintf(class -> fp, ".source %s\n", mod -> name);
692 fprintf(class -> fp, ".class %s\n", mod -> name);
693 fprintf(class -> fp, ".super java/lang/Object\n\n");
694
695 m -> class = class;
696
697 ctx -> gen_context -> current_m = m;
698 }
699
700 void
701 oberon_generator_fini_module(oberon_module_t * mod)
702 {
703 jvm_destroy_class(mod -> gen_mod -> class);
704 }
705
706 static void
707 push_expr(gen_proc_t * p, oberon_expr_t * expr);
708
709 void
710 oberon_generate_begin_module(oberon_context_t * ctx)
711 {
712 struct gen_class * class = ctx -> mod -> gen_mod -> class;
713 gen_proc_t * p = jvm_create_proc(class);
714
715 jvm_generate_function_header(p, "public", "<init>", "()V");
716 jvm_alloc_register_untyped(p -> rf, false);
717 jvm_generate(p, 0, 1, "aload_0");
718 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
719
720 /* Инициализация переменных объявленных в модуле */
721 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
722 while(x != NULL)
723 {
724 if(x -> class == OBERON_CLASS_VAR)
725 {
726 jvm_generate_variable_initialization(p, x -> gen_var);
727 if(x -> type -> class == OBERON_TYPE_ARRAY
728 || x -> type -> class == OBERON_TYPE_RECORD)
729 {
730 jvm_generate_ldst_prepare(p, x -> gen_var);
731 jvm_generate_new(p, x -> type, 0);
732 jvm_generate_store(p, x -> gen_var);
733 }
734 }
735
736 x = x -> next;
737 }
738 }
739
740 void
741 oberon_generate_end_module(oberon_context_t * ctx)
742 {
743 struct gen_class * class = ctx -> mod -> gen_mod -> class;
744 gen_proc_t * p = class -> p;
745
746 jvm_generate(p, 0, 0, "return");
747 jvm_generate_function_end(class -> p);
748 }
749
750 /*
751 * Генерирует код для получения размера измерения массива
752 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
753 * ( aref -- int )
754 */
755
756 static void
757 jvm_generate_array_len(gen_proc_t * p, int dim)
758 {
759 while(dim > 0)
760 {
761 jvm_generate(p, 0, 1, "iconst_0");
762 jvm_generate(p, 2, 1, "aaload");
763 dim -= 1;
764 }
765 jvm_generate(p, 1, 1, "arraylength");
766 }
767
768 static void
769 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
770 {
771 jvm_generate_ldst_prepare(p, v);
772
773 int dim = 0;
774 oberon_type_t * base = arr;
775 while(base -> class == OBERON_TYPE_ARRAY)
776 {
777 if(base -> size == 0)
778 {
779 jvm_generate_load(p, v);
780 jvm_generate_array_len(p, dim);
781 dim += 1;
782 }
783 base = base -> base;
784 }
785
786 jvm_generate_new(p, arr, dim);
787 jvm_generate(p, 1, 2, "dup");
788 jvm_generate_load(p, v);
789 jvm_generate_copy_array(p, arr);
790 jvm_generate_store(p, v);
791 }
792
793 static void
794 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
795 {
796 jvm_generate_ldst_prepare(p, v);
797 jvm_generate_new(p, rec, 0);
798 jvm_generate(p, 1, 2, "dup");
799 jvm_generate_load(p, v);
800 jvm_generate_copy_record(p, rec);
801 jvm_generate_store(p, v);
802 }
803
804 static void
805 jvm_generate_local_initialization(gen_proc_t * p, oberon_object_t * x)
806 {
807 gen_var_t * v;
808 struct gen_class * class;
809 char * name;
810
811 v = x -> gen_var;
812 class = p -> class;
813
814 // Убеждаемся что сейчас находимся в функции
815 assert(class -> p);
816 assert(x -> local);
817
818 name = jvm_get_name(x);
819 switch(x -> class)
820 {
821 case OBERON_CLASS_VAR_PARAM:
822 jvm_generate_var_param_initialization(p, v, name);
823 break;
824 case OBERON_CLASS_PARAM:
825 jvm_generate_param_initialization(p, v, name);
826 break;
827 case OBERON_CLASS_VAR:
828 jvm_generate_named_local_var_initialization(p, v, name);
829 break;
830 case OBERON_CLASS_PROC:
831 break;
832 default:
833 gen_error("jvm_generate_local_initialization: wat");
834 break;
835 }
836
837 if(x -> class == OBERON_CLASS_PARAM || x -> class == OBERON_CLASS_VAR_PARAM)
838 {
839 if(x -> type -> class == OBERON_TYPE_ARRAY)
840 {
841 jvm_generate_array_duplicate_and_replace(p, v, x -> type);
842 }
843 else if(x -> type -> class == OBERON_TYPE_RECORD)
844 {
845 jvm_generate_record_duplicate_and_replace(p, v, x -> type);
846 }
847 }
848 }
849
850 void
851 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
852 {
853 gen_proc_t * p;
854 char * name;
855 char * signature;
856
857 p = proc -> gen_proc;
858
859 if(proc -> local == false)
860 {
861 oberon_generate_procedure_pointer_class(proc);
862 }
863
864 signature = jvm_get_procedure_signature(proc -> type);
865 name = jvm_get_name(proc);
866 jvm_generate_function_header(p, "public static", name, signature);
867
868 /* Инициализация */
869 oberon_object_t * var = proc -> scope -> list -> next;
870 while(var)
871 {
872 jvm_generate_local_initialization(p, var);
873 var = var -> next;
874 }
875 }
876
877 void
878 oberon_generate_end_proc(oberon_context_t * ctx)
879 {
880 gen_module_t * m;
881 gen_proc_t * p;
882
883 m = ctx -> mod -> gen_mod;
884 p = m -> class -> p;
885
886 jvm_generate_function_end(p);
887 }
888
889 gen_label_t *
890 oberon_generator_reserve_label(oberon_context_t * ctx)
891 {
892 gen_module_t * m;
893 gen_proc_t * p;
894 gen_label_t * l;
895
896 m = ctx -> mod -> gen_mod;
897 p = m -> class -> p;
898
899 l = GC_MALLOC(sizeof *l);
900 memset(l, 0, sizeof *l);
901
902 l -> id = jvm_new_label_id(p);
903 return l;
904 }
905
906 void
907 oberon_generate_label(oberon_context_t * ctx, gen_label_t * l)
908 {
909 gen_module_t * m;
910 gen_proc_t * p;
911
912 m = ctx -> mod -> gen_mod;
913 p = m -> class -> p;
914
915 jvm_generate_label(p, l -> id);
916 }
917
918 void
919 oberon_generate_goto(oberon_context_t * ctx, gen_label_t * l)
920 {
921 gen_module_t * m;
922 gen_proc_t * p;
923
924 m = ctx -> mod -> gen_mod;
925 p = m -> class -> p;
926
927 jvm_generate(p, 0, 0, "goto L%i", l -> id);
928 }
929
930 void
931 oberon_generate_branch(oberon_context_t * ctx, oberon_expr_t * cond, bool gotoif, gen_label_t * l)
932 {
933 gen_module_t * m;
934 gen_proc_t * p;
935
936 m = ctx -> mod -> gen_mod;
937 p = m -> class -> p;
938
939 push_expr(p, cond);
940
941 if(gotoif == false)
942 {
943 /* переход если false */
944 jvm_generate(p, 1, 0, "ifeq L%i", l -> id);
945 }
946 else
947 {
948 /* переход если true */
949 jvm_generate(p, 1, 0, "ifne L%i", l -> id);
950 }
951 }
952
953 static void
954 push_varptr(gen_proc_t * p, oberon_expr_t * expr)
955 {
956 assert(expr -> is_item);
957
958 switch(expr -> item.mode)
959 {
960 case MODE_VAR:
961 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
962 break;
963 case MODE_INDEX:
964 push_item(p, (oberon_item_t *) expr -> item.parent);
965 push_expr(p, expr -> item.args);
966 break;
967 case MODE_FIELD:
968 push_item(p, (oberon_item_t *) expr -> item.parent);
969 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
970 break;
971 default:
972 gen_error("push_varptr: wat %i", expr -> item.mode);
973 break;
974 }
975 }
976
977 static void
978 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
979 {
980 assert(desig -> var == NULL);
981 assert(desig -> mode == MODE_CALL);
982
983 char * signature = NULL;
984
985 bool direct_call = false;
986 if(desig -> parent -> mode == MODE_VAR)
987 {
988 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
989 {
990 direct_call = true;
991 }
992 }
993
994 printf("direct_call == %i\n", direct_call);
995
996 oberon_type_t * procsig;
997 procsig = desig -> parent -> result;
998 signature = jvm_get_procedure_signature(procsig);
999
1000 if(direct_call == false)
1001 {
1002 /* Загружаем указатель на процедуру */
1003 push_item(p, desig -> parent);
1004 }
1005
1006 int args_cells = 0;
1007 int result_cells = jvm_cell_size_for_type(procsig -> base);
1008
1009 int num = desig -> num_args;
1010 oberon_expr_t * arg = desig -> args;
1011 oberon_object_t * param = procsig -> decl;
1012 for(int i = 0; i < num; i++)
1013 {
1014 if(param -> class == OBERON_CLASS_VAR_PARAM)
1015 {
1016 args_cells += 2;
1017 push_varptr(p, arg);
1018 }
1019 else
1020 {
1021 args_cells += jvm_cell_size_for_type(arg -> result);
1022 push_expr(p, arg);
1023 }
1024 arg = arg -> next;
1025 param = param -> next;
1026 }
1027
1028 if(direct_call)
1029 {
1030 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1031 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1032 }
1033 else
1034 {
1035 char * cname = jvm_get_class_full_name(procsig);
1036 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1037 }
1038 }
1039
1040 void
1041 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1042 {
1043 assert(desig -> is_item);
1044 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1045 }
1046
1047 void
1048 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1049 {
1050 gen_module_t * m;
1051 gen_proc_t * p;
1052 char prefix;
1053 int cell_size;
1054
1055 m = ctx -> mod -> gen_mod;
1056 p = m -> class -> p;
1057
1058 if(expr)
1059 {
1060 push_expr(p, expr);
1061 prefix = jvm_get_prefix(expr -> result);
1062 cell_size = jvm_cell_size_for_type(expr -> result);
1063 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1064 }
1065 else
1066 {
1067 jvm_generate(p, 0, 0, "return");
1068 }
1069 }
1070
1071 static void
1072 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1073 {
1074 assert(type -> class == OBERON_TYPE_POINTER);
1075
1076 for(int i = 0; i < num; i++)
1077 {
1078 push_expr(p, arg);
1079 arg = arg -> next;
1080 }
1081
1082 jvm_generate_new(p, type -> base, num);
1083 }
1084
1085 static void
1086 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1087 {
1088 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1089 {
1090 char * full_name = jvm_get_class_full_name(to);
1091 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1092 }
1093 else
1094 {
1095 char prefix = jvm_get_prefix(from);
1096 char postfix = jvm_get_postfix(to);
1097 int from_cell_size = jvm_cell_size_for_type(from);
1098 int to_cell_size = jvm_cell_size_for_type(to);
1099
1100 jvm_generate_comment(p, "cast type class from %i(%i) to %i(%i)", from -> class, from -> size, to -> class, to -> size);
1101
1102 if(prefix == postfix)
1103 {
1104 return;
1105 }
1106
1107 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1108 }
1109 }
1110
1111 static void
1112 push_item(gen_proc_t * p, oberon_item_t * item)
1113 {
1114 switch(item -> mode)
1115 {
1116 case MODE_VAR:
1117 if(item -> var -> class == OBERON_CLASS_PROC)
1118 {
1119 jvm_generate_push_procedure_pointer(p, item -> var);
1120 }
1121 else
1122 {
1123 jvm_generate_load(p, item -> var -> gen_var);
1124 }
1125 break;
1126 case MODE_INTEGER:
1127 case MODE_CHAR:
1128 case MODE_SET:
1129 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1130 break;
1131 case MODE_BOOLEAN:
1132 jvm_generate_push_int_size(p, item -> boolean, item -> result -> size);
1133 break;
1134 case MODE_CALL:
1135 jvm_generate_call_proc(p, item);
1136 break;
1137 case MODE_INDEX:
1138 ;
1139 char postfix = jvm_get_postfix(item -> result);
1140 int cell_size = jvm_cell_size_for_postfix(postfix);
1141 assert(item -> parent -> is_item);
1142 push_item(p, (oberon_item_t *) item -> parent);
1143 push_expr(p, item -> args);
1144 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1145 break;
1146 case MODE_FIELD:
1147 assert(item -> parent -> is_item);
1148 push_item(p, (oberon_item_t *) item -> parent);
1149 jvm_generate_load(p, item -> var -> gen_var);
1150 break;
1151 case MODE_DEREF:
1152 /* Все объекты в jvm представляются как указатели */
1153 assert(item -> parent -> is_item);
1154 push_item(p, (oberon_item_t *) item -> parent);
1155 break;
1156 case MODE_NIL:
1157 jvm_generate(p, 0, 1, "aconst_null");
1158 break;
1159 case MODE_NEW:
1160 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1161 break;
1162 case MODE_REAL:
1163 jvm_generate_push_float(p, item -> real, item -> result -> size);
1164 break;
1165 case MODE_STRING:
1166 jvm_generate_push_string(p, item -> string, item -> result -> size);
1167 break;
1168 default:
1169 gen_error("push_item: unk mode %i", item -> mode);
1170 break;
1171 }
1172 }
1173
1174 static void
1175 jvm_generate_logical_not(gen_proc_t * p)
1176 {
1177 int label_done = jvm_new_label_id(p);
1178 int label_false = jvm_new_label_id(p);
1179
1180 jvm_generate(p, 1, 0, "ifne L%i", label_false);
1181 jvm_generate(p, 0, 1, "iconst_1");
1182 jvm_generate(p, 0, 0, "goto L%i", label_done);
1183 jvm_generate_label(p, label_false);
1184 jvm_generate(p, 0, 1, "iconst_0");
1185 jvm_generate_label(p, label_done);
1186 }
1187
1188 static void
1189 jvm_generate_abs(gen_proc_t * p, char prefix)
1190 {
1191 char t = jvm_get_type_of_prefix(prefix);
1192 int cell_size = jvm_cell_size_for_postfix(prefix);
1193 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1194 }
1195
1196 static char *
1197 jvm_get_compare_postfix(int op)
1198 {
1199 char * cmpop = "";
1200 switch(op)
1201 {
1202 case OP_EQ:
1203 cmpop = "eq";
1204 break;
1205 case OP_NEQ:
1206 cmpop = "ne";
1207 break;
1208 case OP_LSS:
1209 cmpop = "lt";
1210 break;
1211 case OP_LEQ:
1212 cmpop = "le";
1213 break;
1214 case OP_GRT:
1215 cmpop = "gt";
1216 break;
1217 case OP_GEQ:
1218 cmpop = "ge";
1219 break;
1220 default:
1221 gen_error("jvm_generate_compare_op: wat");
1222 break;
1223 }
1224 return cmpop;
1225 }
1226
1227 static void
1228 jvm_generate_compare_op(gen_proc_t * p, oberon_type_t * t, int op)
1229 {
1230 char prefix = jvm_get_prefix(t);
1231 int label_true = jvm_new_label_id(p);
1232 int label_done = jvm_new_label_id(p);
1233 int cell_size = jvm_cell_size_for_type(t);
1234 char * cmpop = jvm_get_compare_postfix(op);
1235
1236 if(prefix == 'l')
1237 {
1238 jvm_generate(p, 2 * cell_size, 1, "lcmp");
1239 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1240 }
1241 else if(prefix == 'f' || prefix == 'd')
1242 {
1243 char fop;
1244 if(op == OP_EQ || op == OP_NEQ || op == OP_GRT || op == OP_GEQ)
1245 {
1246 fop = 'l';
1247 }
1248 else
1249 {
1250 fop = 'g';
1251 }
1252 jvm_generate(p, 2 * cell_size, 1, "%ccmp%c", prefix, fop);
1253 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1254 }
1255 else
1256 {
1257 jvm_generate(p, 2 * cell_size, 0, "if_%ccmp%s L%i", prefix, cmpop, label_true);
1258 }
1259
1260 jvm_generate(p, 0, 1, "iconst_0");
1261 jvm_generate(p, 0, 0, "goto L%i", label_done);
1262 jvm_generate_label(p, label_true);
1263 jvm_generate(p, 0, 1, "iconst_1");
1264 jvm_generate_label(p, label_done);
1265 }
1266
1267 static void
1268 jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
1269 {
1270 char prefix = jvm_get_prefix(t);
1271 int cell_size = jvm_cell_size_for_type(t);
1272 switch(op)
1273 {
1274 case OP_UNARY_MINUS:
1275 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1276 break;
1277 case OP_COMPLEMENTATION:
1278 jvm_generate_push_int_size(p, -1, t -> size);
1279 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1280 break;
1281 case OP_LOGIC_NOT:
1282 jvm_generate_logical_not(p);
1283 break;
1284 case OP_ABS:
1285 jvm_generate_abs(p, prefix);
1286 break;
1287
1288 case OP_ADD:
1289 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1290 break;
1291 case OP_SUB:
1292 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1293 break;
1294 case OP_MUL:
1295 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1296 break;
1297 case OP_DIV:
1298 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1299 break;
1300 case OP_MOD:
1301 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1302 break;
1303 case OP_UNION:
1304 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1305 break;
1306 case OP_INTERSECTION:
1307 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1308 break;
1309 case OP_DIFFERENCE:
1310 jvm_generate_push_int_size(p, -1, t -> size);
1311 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1312 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1313 break;
1314 case OP_SYM_DIFFERENCE:
1315 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1316 break;
1317
1318 case OP_EQ:
1319 case OP_NEQ:
1320 case OP_LSS:
1321 case OP_LEQ:
1322 case OP_GRT:
1323 case OP_GEQ:
1324 jvm_generate_compare_op(p, t, op);
1325 break;
1326 default:
1327 gen_error("jvm_generate_operator: unk op %i", op);
1328 break;
1329 }
1330 }
1331
1332 static void
1333 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1334 {
1335 int label_calc_b = jvm_new_label_id(p);
1336 int label_done = jvm_new_label_id(p);
1337
1338 /* a OR b -- если a, то TRUE, иначе b */
1339
1340 push_expr(p, a);
1341 jvm_generate(p, 1, 0, "ifeq L%i", label_calc_b);
1342 jvm_generate(p, 0, 1, "iconst_1");
1343 jvm_generate(p, 0, 0, "goto L%i", label_done);
1344 jvm_generate_label(p, label_calc_b);
1345 push_expr(p, b);
1346 jvm_generate_label(p, label_done);
1347 }
1348
1349 static void
1350 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1351 {
1352 int label_false = jvm_new_label_id(p);
1353 int label_done = jvm_new_label_id(p);
1354
1355 /* a AND b -- если a, то b, иначе FALSE */
1356
1357 push_expr(p, a);
1358 jvm_generate(p, 1, 0, "ifeq L%i", label_false);
1359 push_expr(p, b);
1360 jvm_generate(p, 0, 0, "goto L%i", label_done);
1361 jvm_generate_label(p, label_false);
1362 jvm_generate(p, 0, 1, "iconst_0");
1363 jvm_generate_label(p, label_done);
1364 }
1365
1366 static void
1367 jvm_generate_range(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1368 {
1369 /* { a } == 1 << a */
1370 /* { a..b } == (a <= b) ? ((2 << b) - (1 << a)) : (0); */
1371
1372 char prefix;
1373 int cell_size;
1374 oberon_type_t * type;
1375 gen_var_t * ra;
1376 gen_var_t * rb;
1377 int label_else;
1378 int label_end;
1379
1380 type = a -> result;
1381 cell_size = jvm_cell_size_for_type(type);
1382 prefix = jvm_get_prefix(type);
1383
1384 if(b == NULL)
1385 {
1386 jvm_generate_push_int_size(p, 1, type -> size);
1387 push_expr(p, a);
1388 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1389 }
1390 else
1391 {
1392 ra = oberon_generator_new_var();
1393 rb = oberon_generator_new_var();
1394 jvm_generate_and_init_local_var(p, ra, type -> gen_type);
1395 jvm_generate_and_init_local_var(p, rb, type -> gen_type);
1396 label_else = jvm_new_label_id(p);
1397 label_end = jvm_new_label_id(p);
1398
1399 push_expr(p, a);
1400 jvm_generate_store(p, ra);
1401 push_expr(p, b);
1402 jvm_generate_store(p, rb);
1403
1404 jvm_generate_load(p, ra);
1405 jvm_generate_load(p, rb);
1406 jvm_generate(p, 2 * cell_size, 0, "if_%ccmpgt L%i", prefix, label_else);
1407
1408 jvm_generate_push_int_size(p, 2, type -> size);
1409 jvm_generate_load(p, rb);
1410 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1411 jvm_generate_push_int_size(p, 2, type -> size);
1412 jvm_generate_load(p, ra);
1413 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1414 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1415 jvm_generate(p, 0, 0, "goto L%i", label_end);
1416
1417 jvm_generate_label(p, label_else);
1418 jvm_generate_push_int_size(p, 0, type -> size);
1419 jvm_generate_label(p, label_end);
1420 }
1421
1422 /* TODO free registers */
1423 }
1424
1425 static void
1426 jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1427 {
1428 oberon_type_t * t = a -> result;
1429 int cell_size = jvm_cell_size_for_type(t);
1430 char prefix = jvm_get_prefix(t);
1431 int label_else = jvm_new_label_id(p);
1432 int label_end = jvm_new_label_id(p);
1433
1434 jvm_generate_push_int_size(p, 1, t -> size);
1435 push_expr(p, a);
1436 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1437 push_expr(p, b);
1438 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1439
1440 if(cell_size > 1)
1441 {
1442 jvm_generate(p, cell_size, 0, "lcmp");
1443 }
1444
1445 jvm_generate(p, 1, 0, "ifeq L%i", label_else);
1446 jvm_generate(p, 0, 1, "iconst_1");
1447 jvm_generate(p, 0, 0, "goto L%i", label_end);
1448 jvm_generate_label(p, label_else);
1449 jvm_generate(p, 0, 1, "iconst_0");
1450 jvm_generate_label(p, label_end);
1451 }
1452
1453 static void
1454 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1455 {
1456 oberon_type_t * preq = oper -> left -> result;
1457 int op = oper -> op;
1458 switch(op)
1459 {
1460 case OP_CAST:
1461 push_expr(p, oper -> left);
1462 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1463 break;
1464 case OP_COMPLEMENTATION:
1465 case OP_UNARY_MINUS:
1466 case OP_LOGIC_NOT:
1467 case OP_ABS:
1468 push_expr(p, oper -> left);
1469 jvm_generate_operator(p, preq, op);
1470 break;
1471
1472 case OP_ADD:
1473 case OP_SUB:
1474 case OP_MUL:
1475 case OP_DIV:
1476 case OP_MOD:
1477
1478 case OP_UNION:
1479 case OP_INTERSECTION:
1480 case OP_DIFFERENCE:
1481 case OP_SYM_DIFFERENCE:
1482
1483 case OP_EQ:
1484 case OP_NEQ:
1485 case OP_LSS:
1486 case OP_LEQ:
1487 case OP_GRT:
1488 case OP_GEQ:
1489 push_expr(p, oper -> left);
1490 push_expr(p, oper -> right);
1491 jvm_generate_operator(p, preq, op);
1492 break;
1493
1494 case OP_LOGIC_OR:
1495 jvm_generate_logical_or(p, oper -> left, oper -> right);
1496 break;
1497 case OP_LOGIC_AND:
1498 jvm_generate_logical_and(p, oper -> left, oper -> right);
1499 break;
1500
1501 case OP_IS:
1502 preq = oper -> right -> result;
1503 char * cname = jvm_get_class_full_name(preq);
1504 push_expr(p, oper -> left);
1505 jvm_generate(p, 1, 1, "instanceof %s", cname);
1506 break;
1507 case OP_RANGE:
1508 jvm_generate_range(p, oper -> left, oper -> right);
1509 break;
1510 case OP_IN:
1511 jvm_generate_in(p, oper -> left, oper -> right);
1512 break;
1513 default:
1514 gen_error("push_oper: unk op %i", op);
1515 break;
1516 }
1517 }
1518
1519 static void
1520 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1521 {
1522 if(expr -> is_item)
1523 {
1524 push_item(p, (oberon_item_t *) expr);
1525 }
1526 else
1527 {
1528 push_operator(p, (oberon_oper_t *) expr);
1529 }
1530 }
1531
1532 static void
1533 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1534 {
1535 assert(dst -> is_item);
1536 oberon_item_t * item = (oberon_item_t *) dst;
1537
1538 if(dst -> result -> class == OBERON_TYPE_ARRAY
1539 || src -> result -> class == OBERON_TYPE_ARRAY)
1540 {
1541 push_expr(p, dst);
1542 push_expr(p, src);
1543 jvm_generate_copy_array(p, dst -> result);
1544 }
1545 else if(dst -> result -> class == OBERON_TYPE_RECORD
1546 || src -> result -> class == OBERON_TYPE_RECORD)
1547 {
1548 push_expr(p, dst);
1549 push_expr(p, src);
1550 jvm_generate_copy_record(p, dst -> result);
1551 }
1552 else switch(item -> mode)
1553 {
1554 case MODE_VAR:
1555 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1556 push_expr(p, src);
1557 jvm_generate_store(p, item -> var -> gen_var);
1558 break;
1559 case MODE_INDEX:
1560 ;
1561 char postfix = jvm_get_postfix(src -> result);
1562 int cell_size = jvm_cell_size_for_postfix(postfix);
1563 assert(item -> parent -> is_item);
1564 push_item(p, (oberon_item_t *) item -> parent);
1565 push_expr(p, item -> args);
1566 push_expr(p, src);
1567 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1568 break;
1569 case MODE_FIELD:
1570 assert(item -> parent -> is_item);
1571 push_item(p, (oberon_item_t *) item -> parent);
1572 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1573 push_expr(p, src);
1574 jvm_generate_store(p, item -> var -> gen_var);
1575 break;
1576 default:
1577 gen_error("store_expr: unk mode %i", item -> mode);
1578 break;
1579 }
1580 }
1581
1582 void
1583 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1584 {
1585 gen_module_t * m;
1586 gen_proc_t * p;
1587
1588 m = ctx -> mod -> gen_mod;
1589 p = m -> class -> p;
1590
1591 store_expr(p, dst, src);
1592 }
1593
1594 void
1595 oberon_generate_code(oberon_context_t * ctx)
1596 {
1597 printf("generate code\n");
1598 }
1599
1600 void
1601 oberon_generator_dump(oberon_context_t * ctx, char * path)
1602 {
1603 printf("jit: dump code\n");
1604 }
1605
1606 void *
1607 oberon_generator_get_procedure(oberon_context_t * ctx, const char * name)
1608 {
1609 printf("jit: get pointer to procedure %s\n", name);
1610 return NULL;
1611 }
1612
1613 void *
1614 oberon_generator_get_var(oberon_context_t * ctx, const char * name)
1615 {
1616 printf("jit: get pointer to var %s\n", name);
1617 return NULL;
1618 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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