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[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 gen_context -> dir = ".";
323 }
324
325 void
326 oberon_generator_destroy_context(oberon_context_t * ctx)
327 {
328 }
329
330 static void
331 oberon_generate_procedure_class(const char * dir, oberon_type_t * proc)
332 {
333 FILE * fp;
334 char * cname;
335 char * signature;
336 struct gen_class * class;
337
338 cname = jvm_get_class_full_name(proc);
339 class = jvm_create_class(dir, cname);
340 fp = class -> fp;
341
342 fprintf(fp, ".source SYSTEM\n");
343 fprintf(fp, ".class public abstract %s\n", cname);
344 fprintf(fp, ".super java/lang/Object\n\n");
345
346 fprintf(fp, ".method <init>()V\n");
347 fprintf(fp, " aload_0\n");
348 fprintf(fp, " invokespecial java/lang/Object/<init>()V\n");
349 fprintf(fp, " return\n");
350 fprintf(fp, ".end method\n\n");
351
352 signature = jvm_get_procedure_signature(proc);
353
354 fprintf(fp, ".method public abstract invoke%s\n", signature);
355 fprintf(fp, ".end method\n\n");
356
357 jvm_destroy_class(class);
358 }
359
360 static void
361 oberon_generate_procedure_pointer_class(const char * dir, oberon_object_t * proc)
362 {
363 FILE * fp;
364 char * cname;
365 char * abscname;
366 char * absdesc;
367 char * signature;
368 struct gen_class * class;
369
370 cname = jvm_get_field_full_name_safe(proc);
371 class = jvm_create_class(dir, cname);
372 abscname = jvm_get_class_full_name(proc -> type);
373 absdesc = jvm_get_descriptor(proc -> type);
374 fp = class -> fp;
375
376 fprintf(fp, ".source %s\n", proc -> module -> name);
377 fprintf(fp, ".class public %s\n", cname);
378 fprintf(fp, ".super %s\n\n", abscname);
379
380 fprintf(fp, ".field public static pointer %s\n\n", absdesc);
381
382 fprintf(fp, ".method private <init>()V\n");
383 fprintf(fp, " aload_0\n");
384 fprintf(fp, " invokespecial %s/<init>()V\n", abscname);
385 fprintf(fp, " return\n");
386 fprintf(fp, ".end method\n\n");
387
388 fprintf(fp, ".method static <clinit>()V\n");
389 fprintf(fp, " .limit stack 2\n");
390 fprintf(fp, " new %s\n", cname);
391 fprintf(fp, " dup\n");
392 fprintf(fp, " invokespecial %s/<init>()V\n", cname);
393 fprintf(fp, " putstatic %s/pointer %s\n", cname, absdesc);
394 fprintf(fp, " return\n");
395 fprintf(fp, ".end method\n\n");
396
397 signature = jvm_get_procedure_signature(proc -> type);
398
399 gen_proc_t * p = jvm_create_proc(class);
400 jvm_generate_function_header(p, "public", "invoke", signature);
401 jvm_alloc_register_untyped(p -> rf, false);
402
403 int use_size = 0;
404 int num = proc -> type -> num_decl;
405 oberon_object_t * param = proc -> type -> decl;
406 for(int i = 0; i < num; i++)
407 {
408 gen_type_t * t = param -> type -> gen_type;
409 if(param -> class == OBERON_CLASS_VAR_PARAM)
410 {
411 int reg = jvm_alloc_register_untyped(p -> rf, true);
412 jvm_generate(p, 0, 1, "aload %i", reg);
413 jvm_generate(p, 0, 1, "iload %i", reg + 1);
414 }
415 else
416 {
417 int reg = jvm_alloc_register_untyped(p -> rf, t -> wide);
418 jvm_generate(p, 0, t -> cell_size, "%cload %i", t -> prefix, reg);
419 }
420 use_size += t -> cell_size;
421 param = param -> next;
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_NOTYPE)
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(const char * dir, 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(dir, 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 gen_context_t * c;
480 c = ctx -> gen_context;
481
482 gen_module_t * m;
483 switch(type -> class)
484 {
485 case OBERON_TYPE_NOTYPE:
486 case OBERON_TYPE_INTEGER:
487 case OBERON_TYPE_BOOLEAN:
488 case OBERON_TYPE_ARRAY:
489 case OBERON_TYPE_POINTER:
490 case OBERON_TYPE_REAL:
491 case OBERON_TYPE_CHAR:
492 case OBERON_TYPE_STRING:
493 case OBERON_TYPE_SET:
494 case OBERON_TYPE_NIL:
495 break;
496 case OBERON_TYPE_RECORD:
497 m = type -> module -> gen_mod;
498 oberon_generate_record_class(c -> dir, m, type);
499 break;
500 case OBERON_TYPE_PROCEDURE:
501 oberon_generate_procedure_class(c -> dir, type);
502 break;
503 default:
504 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
505 break;
506 }
507
508 if(type -> class != OBERON_TYPE_NOTYPE)
509 {
510 t -> wide = jvm_is_wide_type(type);
511 t -> prefix = jvm_get_prefix(type);
512 t -> postfix = jvm_get_postfix(type);
513 }
514
515 t -> cell_size = jvm_cell_size_for_type(type);
516
517 if(type -> class != OBERON_TYPE_NIL)
518 {
519 t -> desc = jvm_get_descriptor(type);
520 }
521 }
522
523 void
524 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
525 {
526 struct gen_class * class;
527 class = rec -> gen_type -> class;
528
529 int num = rec -> num_decl;
530 oberon_object_t * field = rec -> decl;
531 for(int i = 0; i < num; i++)
532 {
533 jvm_generate_var(field -> gen_var);
534 field = field -> next;
535 }
536
537 /* Стандартный конструктор класса */
538 /* Инициализирует внутренние статические записи и массивы */
539 gen_proc_t * p = jvm_create_proc(class);
540 jvm_generate_function_header(p, "public", "<init>", "()V");
541 jvm_alloc_register_untyped(p -> rf, false);
542 jvm_generate(p, 0, 1, "aload_0");
543 if(class -> base)
544 {
545 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
546 }
547 else
548 {
549 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
550 }
551 num = rec -> num_decl;
552 field = rec -> decl;
553 for(int i = 0; i < num; i++)
554 {
555 jvm_generate(p, 0, 1, "aload_0");
556 jvm_generate_var_initialization(p, field -> gen_var);
557
558 if(field -> type -> class == OBERON_TYPE_RECORD
559 || field -> type -> class == OBERON_TYPE_ARRAY)
560 {
561 jvm_generate(p, 0, 1, "aload_0");
562 jvm_generate_ldst_prepare(p, field -> gen_var);
563 jvm_generate_new(p, field -> type, 0);
564 jvm_generate_store(p, field -> gen_var);
565 }
566 field = field -> next;
567 }
568 jvm_generate(p, 0, 0, "return");
569 jvm_generate_function_end(p);
570
571 /* Метод для копирования полей класса */
572 /* reg0 == src -> reg1 == dst */
573 p = jvm_create_proc(class);
574 char * signature = new_string("(%s%s)V", rec -> gen_type -> desc, rec -> gen_type -> desc);
575 jvm_generate_function_header(p, "public static", "$COPY$", signature);
576
577 gen_var_t * copy_dst = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "dst", rec -> gen_type);
578 gen_var_t * copy_src = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "src", rec -> gen_type);
579 jvm_generate_var(copy_dst);
580 jvm_generate_var(copy_src);
581 jvm_generate_var_initialization(p, copy_dst);
582 jvm_generate_var_initialization(p, copy_src);
583
584 num = rec -> num_decl;
585 field = rec -> decl;
586 for(int i = 0; i < num; i++)
587 {
588 if(field -> type -> class == OBERON_TYPE_RECORD)
589 {
590 jvm_generate_load(p, copy_dst);
591 jvm_generate_load(p, field -> gen_var);
592 jvm_generate_load(p, copy_src);
593 jvm_generate_load(p, field -> gen_var);
594 jvm_generate_copy_record(p, field -> type);
595 }
596 else if(field -> type -> class == OBERON_TYPE_ARRAY)
597 {
598 jvm_generate_load(p, copy_dst);
599 jvm_generate_load(p, field -> gen_var);
600 jvm_generate_load(p, copy_src);
601 jvm_generate_load(p, field -> gen_var);
602 jvm_generate_copy_array(p, field -> type);
603 }
604 else
605 {
606 jvm_generate_load(p, copy_dst);
607 jvm_generate_ldst_prepare(p, field -> gen_var);
608 jvm_generate_load(p, copy_src);
609 jvm_generate_load(p, field -> gen_var);
610 jvm_generate_store(p, field -> gen_var);
611 }
612 field = field -> next;
613 }
614 jvm_generate(p, 0, 0, "return");
615 jvm_generate_function_end(p);
616
617 jvm_destroy_class(class);
618 }
619
620 void
621 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
622 {
623 gen_module_t * m;
624 m = ctx -> mod -> gen_mod;
625
626 struct gen_class * class;
627 class = m -> class;
628
629 gen_proc_t * p;
630 struct gen_class * c;
631 char * name = var -> name;
632 gen_type_t * t = var -> type -> gen_type;
633 switch(var -> class)
634 {
635 case OBERON_CLASS_VAR_PARAM:
636 p = var -> parent -> gen_proc;
637 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VARPTR, name, t);
638 break;
639 case OBERON_CLASS_PARAM:
640 p = var -> parent -> gen_proc;
641 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VAR, name, t);
642 break;
643 case OBERON_CLASS_FIELD:
644 c = var -> parent_type -> gen_type -> class;
645 var -> gen_var = jvm_create_class_var(c, JVM_STORAGE_FIELD_VAR, name, t);
646 break;
647 case OBERON_CLASS_VAR:
648 if(var -> local)
649 {
650 p = var -> parent -> gen_proc;
651 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_VAR, name, t);
652 }
653 else
654 {
655 var -> gen_var = jvm_create_class_var(class, JVM_STORAGE_STATIC_VAR, name, t);
656 jvm_generate_var(var -> gen_var);
657 }
658 break;
659 default:
660 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
661 break;
662 }
663 }
664
665 void
666 oberon_generator_init_temp_var(oberon_context_t * ctx, oberon_object_t * var)
667 {
668 assert(var -> class == OBERON_CLASS_VAR);
669
670 gen_module_t * m;
671 m = ctx -> mod -> gen_mod;
672
673 gen_proc_t * p;
674 p = m -> class -> p;
675
676 gen_type_t * t;
677 t = var -> type -> gen_type;
678
679 var -> gen_var = jvm_create_function_temp_var(p, t);
680 jvm_generate_var(var -> gen_var);
681 jvm_generate_var_initialization(p, var -> gen_var);
682 }
683
684 void
685 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
686 {
687 struct gen_class * class = proc -> module -> gen_mod -> class;
688 proc -> gen_proc = jvm_create_proc(class);
689 proc -> gen_proc -> full_name = jvm_get_field_full_name_safe(proc);
690 jvm_create_static_links(proc);
691 }
692
693 void
694 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
695 {
696 gen_module_t * m = GC_MALLOC(sizeof *m);
697 memset(m, 0, sizeof *m);
698 mod -> gen_mod = m;
699
700 gen_context_t * c;
701 c = ctx -> gen_context;
702
703 struct gen_class * class;
704 class = jvm_create_class(c -> dir, mod -> name);
705
706 fprintf(class -> fp, ".source %s\n", mod -> name);
707 fprintf(class -> fp, ".class %s\n", mod -> name);
708 fprintf(class -> fp, ".super java/lang/Object\n\n");
709
710 fprintf(class -> fp, ".field private static $INITIALIZED$ Z\n\n");
711
712 m -> class = class;
713
714 c -> current_m = m;
715 }
716
717 void
718 oberon_generator_fini_module(oberon_module_t * mod)
719 {
720 jvm_destroy_class(mod -> gen_mod -> class);
721 }
722
723 static void
724 push_expr(gen_proc_t * p, oberon_expr_t * expr);
725
726 void
727 oberon_generate_begin_module(oberon_context_t * ctx)
728 {
729 gen_proc_t * p;
730 int label_cont;
731 struct gen_class * class;
732
733 class = ctx -> mod -> gen_mod -> class;
734
735 p = jvm_create_proc(class);
736 jvm_generate_function_header(p, "public static", "BEGIN", "()V");
737
738 label_cont = jvm_new_label_id(p);
739 jvm_generate(p, 0, 1, "getstatic %s/$INITIALIZED$ Z", class -> full_name);
740 jvm_generate(p, 1, 0, "ifeq L%i", label_cont);
741 jvm_generate(p, 0, 0, "return");
742 jvm_generate_label(p, label_cont);
743
744 jvm_generate(p, 0, 1, "iconst_1");
745 jvm_generate(p, 1, 0, "putstatic %s/$INITIALIZED$ Z", class -> full_name);
746
747 /* Инициализация переменных объявленных в модуле */
748 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
749 while(x != NULL)
750 {
751 if(x -> class == OBERON_CLASS_MODULE)
752 {
753 jvm_generate(p, 0, 0, "invokestatic %s/BEGIN()V", x -> module -> gen_mod -> class -> full_name);
754 }
755 else if(x -> class == OBERON_CLASS_VAR)
756 {
757 jvm_generate_var_initialization(p, x -> gen_var);
758 if(x -> type -> class == OBERON_TYPE_ARRAY
759 || x -> type -> class == OBERON_TYPE_RECORD)
760 {
761 jvm_generate_ldst_prepare(p, x -> gen_var);
762 jvm_generate_new(p, x -> type, 0);
763 jvm_generate_store(p, x -> gen_var);
764 }
765 }
766
767 x = x -> next;
768 }
769 }
770
771 void
772 oberon_generate_end_module(oberon_context_t * ctx)
773 {
774 struct gen_class * class = ctx -> mod -> gen_mod -> class;
775 gen_proc_t * p = class -> p;
776
777 jvm_generate(p, 0, 0, "return");
778 jvm_generate_function_end(class -> p);
779
780 p = jvm_create_proc(class);
781 jvm_generate_function_header(p, "private", "<init>", "()V");
782 jvm_alloc_register_untyped(p -> rf, false);
783 jvm_generate(p, 0, 1, "aload_0");
784 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
785 jvm_generate(p, 0, 0, "return");
786 jvm_generate_function_end(class -> p);
787 }
788
789 /*
790 * Генерирует код для получения размера измерения массива
791 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
792 * ( aref -- int )
793 */
794
795 static void
796 jvm_generate_array_len(gen_proc_t * p, int dim)
797 {
798 while(dim > 0)
799 {
800 jvm_generate(p, 0, 1, "iconst_0");
801 jvm_generate(p, 2, 1, "aaload");
802 dim -= 1;
803 }
804 jvm_generate(p, 1, 1, "arraylength");
805 }
806
807 static void
808 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
809 {
810 jvm_generate_ldst_prepare(p, v);
811
812 int dim = 0;
813 oberon_type_t * base = arr;
814 while(base -> class == OBERON_TYPE_ARRAY)
815 {
816 if(base -> size == 0)
817 {
818 jvm_generate_load(p, v);
819 jvm_generate_array_len(p, dim);
820 dim += 1;
821 }
822 base = base -> base;
823 }
824
825 jvm_generate_new(p, arr, dim);
826 jvm_generate(p, 1, 2, "dup");
827 jvm_generate_load(p, v);
828 jvm_generate_copy_array(p, arr);
829 jvm_generate_store(p, v);
830 }
831
832 static void
833 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
834 {
835 jvm_generate_ldst_prepare(p, v);
836 jvm_generate_new(p, rec, 0);
837 jvm_generate(p, 1, 2, "dup");
838 jvm_generate_load(p, v);
839 jvm_generate_copy_record(p, rec);
840 jvm_generate_store(p, v);
841 }
842
843 static void
844 jvm_generate_local_object(gen_proc_t * p, oberon_object_t * x)
845 {
846 gen_var_t * v;
847 struct gen_class * class;
848
849 v = x -> gen_var;
850 class = p -> class;
851
852 // Убеждаемся что сейчас находимся в функции
853 assert(class -> p);
854 assert(x -> local);
855
856 switch(x -> class)
857 {
858 case OBERON_CLASS_VAR_PARAM:
859 case OBERON_CLASS_PARAM:
860 case OBERON_CLASS_VAR:
861 jvm_generate_var(v);
862 break;
863 case OBERON_CLASS_PROC:
864 break;
865 default:
866 gen_error("jvm_generate_local_initialization: wat");
867 break;
868 }
869 }
870
871 static void
872 jvm_generate_local_initialization(gen_proc_t * p, oberon_object_t * x)
873 {
874 gen_var_t * v;
875 struct gen_class * class;
876
877 v = x -> gen_var;
878 class = p -> class;
879
880 // Убеждаемся что сейчас находимся в функции
881 assert(class -> p);
882 assert(x -> local);
883
884 switch(x -> class)
885 {
886 case OBERON_CLASS_VAR_PARAM:
887 case OBERON_CLASS_PARAM:
888 case OBERON_CLASS_VAR:
889 jvm_generate_var_initialization(p, v);
890 break;
891 case OBERON_CLASS_PROC:
892 break;
893 default:
894 gen_error("jvm_generate_local_initialization: wat");
895 break;
896 }
897
898 if(x -> class == OBERON_CLASS_PARAM)
899 {
900 if(x -> type -> class == OBERON_TYPE_ARRAY)
901 {
902 jvm_generate_array_duplicate_and_replace(p, v, x -> type);
903 }
904 else if(x -> type -> class == OBERON_TYPE_RECORD)
905 {
906 jvm_generate_record_duplicate_and_replace(p, v, x -> type);
907 }
908 }
909 }
910
911 void
912 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
913 {
914 gen_proc_t * p;
915 char * name;
916 char * signature;
917 oberon_object_t * var;
918
919 p = proc -> gen_proc;
920
921 if(proc -> local)
922 {
923 signature = jvm_get_local_procedure_signature(proc);
924 }
925 else
926 {
927 oberon_generate_procedure_pointer_class(p -> class -> dir, proc);
928 signature = jvm_get_procedure_signature(proc -> type);
929 }
930
931 name = jvm_get_name(proc);
932 jvm_generate_function_header(p, "public static", name, signature);
933
934 if(proc -> local)
935 {
936 jvm_generate_staticlinks(proc);
937 }
938
939 jvm_generate_procedure_frame(proc);
940
941 /* Создание параметров и переменных */
942 var = proc -> scope -> list -> next;
943 while(var)
944 {
945 jvm_generate_local_object(p, var);
946 var = var -> next;
947 }
948
949 jvm_generate_frame_initialization(p);
950
951 /* Инициализация парамеров и переменных */
952 var = proc -> scope -> list -> next;
953 while(var)
954 {
955 jvm_generate_local_initialization(p, var);
956 var = var -> next;
957 }
958 }
959
960 void
961 oberon_generate_end_proc(oberon_context_t * ctx)
962 {
963 gen_module_t * m;
964 gen_proc_t * p;
965
966 m = ctx -> mod -> gen_mod;
967 p = m -> class -> p;
968
969 jvm_generate_function_end(p);
970 }
971
972 gen_label_t *
973 oberon_generator_reserve_label(oberon_context_t * ctx)
974 {
975 gen_module_t * m;
976 gen_proc_t * p;
977 gen_label_t * l;
978
979 m = ctx -> mod -> gen_mod;
980 p = m -> class -> p;
981
982 l = GC_MALLOC(sizeof *l);
983 memset(l, 0, sizeof *l);
984
985 l -> id = jvm_new_label_id(p);
986 return l;
987 }
988
989 void
990 oberon_generate_label(oberon_context_t * ctx, gen_label_t * l)
991 {
992 gen_module_t * m;
993 gen_proc_t * p;
994
995 m = ctx -> mod -> gen_mod;
996 p = m -> class -> p;
997
998 jvm_generate_label(p, l -> id);
999 }
1000
1001 void
1002 oberon_generate_goto(oberon_context_t * ctx, gen_label_t * l)
1003 {
1004 gen_module_t * m;
1005 gen_proc_t * p;
1006
1007 m = ctx -> mod -> gen_mod;
1008 p = m -> class -> p;
1009
1010 jvm_generate(p, 0, 0, "goto L%i", l -> id);
1011 }
1012
1013 void
1014 oberon_generate_branch(oberon_context_t * ctx, oberon_expr_t * cond, bool gotoif, gen_label_t * l)
1015 {
1016 gen_module_t * m;
1017 gen_proc_t * p;
1018
1019 m = ctx -> mod -> gen_mod;
1020 p = m -> class -> p;
1021
1022 push_expr(p, cond);
1023
1024 if(gotoif == false)
1025 {
1026 /* переход если false */
1027 jvm_generate(p, 1, 0, "ifeq L%i", l -> id);
1028 }
1029 else
1030 {
1031 /* переход если true */
1032 jvm_generate(p, 1, 0, "ifne L%i", l -> id);
1033 }
1034 }
1035
1036 static void
1037 push_varptr(gen_proc_t * p, oberon_expr_t * expr)
1038 {
1039 assert(expr -> is_item);
1040
1041 switch(expr -> item.mode)
1042 {
1043 case MODE_VAR:
1044 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1045 break;
1046 case MODE_INDEX:
1047 push_item(p, (oberon_item_t *) expr -> item.parent);
1048 push_expr(p, expr -> item.args);
1049 break;
1050 case MODE_FIELD:
1051 push_item(p, (oberon_item_t *) expr -> item.parent);
1052 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1053 break;
1054 default:
1055 gen_error("push_varptr: wat %i", expr -> item.mode);
1056 break;
1057 }
1058 }
1059
1060 static void
1061 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1062 {
1063 assert(desig -> var == NULL);
1064 assert(desig -> mode == MODE_CALL);
1065
1066 bool direct_call = false;
1067 if(desig -> parent -> mode == MODE_VAR)
1068 {
1069 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1070 {
1071 direct_call = true;
1072 }
1073 }
1074
1075 oberon_type_t * procsig;
1076 procsig = desig -> parent -> result;
1077
1078 if(direct_call == false)
1079 {
1080 /* Загружаем указатель на процедуру */
1081 push_item(p, desig -> parent);
1082 }
1083
1084 if(direct_call)
1085 {
1086 jvm_generate_push_static_links(p, desig -> parent -> var);
1087 }
1088
1089 int args_cells = 0;
1090 int result_cells = jvm_cell_size_for_type(procsig -> base);
1091
1092 int num = desig -> num_args;
1093 oberon_expr_t * arg = desig -> args;
1094 oberon_object_t * param = procsig -> decl;
1095 for(int i = 0; i < num; i++)
1096 {
1097 if(param -> class == OBERON_CLASS_VAR_PARAM)
1098 {
1099 args_cells += 2;
1100 push_varptr(p, arg);
1101 }
1102 else
1103 {
1104 args_cells += jvm_cell_size_for_type(arg -> result);
1105 push_expr(p, arg);
1106 }
1107 arg = arg -> next;
1108 param = param -> next;
1109 }
1110
1111 if(direct_call)
1112 {
1113 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1114 char * signature = jvm_get_local_procedure_signature(desig -> parent -> var);
1115 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1116 }
1117 else
1118 {
1119 char * cname = jvm_get_class_full_name(procsig);
1120 char * signature = jvm_get_procedure_signature(procsig);
1121 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1122 }
1123 }
1124
1125 void
1126 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1127 {
1128 assert(desig -> is_item);
1129 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1130 }
1131
1132 void
1133 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1134 {
1135 gen_module_t * m;
1136 gen_proc_t * p;
1137 char prefix;
1138 int cell_size;
1139
1140 m = ctx -> mod -> gen_mod;
1141 p = m -> class -> p;
1142
1143 if(expr)
1144 {
1145 push_expr(p, expr);
1146 prefix = jvm_get_prefix(expr -> result);
1147 cell_size = jvm_cell_size_for_type(expr -> result);
1148 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1149 }
1150 else
1151 {
1152 jvm_generate(p, 0, 0, "return");
1153 }
1154 }
1155
1156 static void
1157 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1158 {
1159 assert(type -> class == OBERON_TYPE_POINTER);
1160
1161 for(int i = 0; i < num; i++)
1162 {
1163 push_expr(p, arg);
1164 arg = arg -> next;
1165 }
1166
1167 jvm_generate_new(p, type -> base, num);
1168 }
1169
1170 static void
1171 jvm_generate_cast_prefix(gen_proc_t * p, char prefix, char postfix)
1172 {
1173 if(prefix == postfix)
1174 {
1175 return;
1176 }
1177
1178 int from_cell_size = jvm_cell_size_for_postfix(prefix);
1179 int to_cell_size = jvm_cell_size_for_postfix(postfix);
1180 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1181 }
1182
1183 static void
1184 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1185 {
1186 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1187 {
1188 if(to -> class == OBERON_TYPE_POINTER && to -> base -> class == OBERON_TYPE_RECORD)
1189 {
1190 char * full_name = jvm_get_class_full_name(to);
1191 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1192 }
1193 }
1194 else
1195 {
1196 char prefix = jvm_get_prefix(from);
1197 char postfix = jvm_get_postfix(to);
1198 jvm_generate_cast_prefix(p, prefix, postfix);
1199 }
1200 }
1201
1202 static void
1203 push_item(gen_proc_t * p, oberon_item_t * item)
1204 {
1205 switch(item -> mode)
1206 {
1207 case MODE_VAR:
1208 if(item -> var -> class == OBERON_CLASS_PROC)
1209 {
1210 jvm_generate_push_procedure_pointer(p, item -> var);
1211 }
1212 else
1213 {
1214 jvm_generate_load(p, item -> var -> gen_var);
1215 }
1216 break;
1217 case MODE_INTEGER:
1218 case MODE_BOOLEAN:
1219 case MODE_CHAR:
1220 case MODE_SET:
1221 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1222 break;
1223 case MODE_CALL:
1224 jvm_generate_call_proc(p, item);
1225 break;
1226 case MODE_INDEX:
1227 ;
1228 char postfix = jvm_get_postfix(item -> result);
1229 int cell_size = jvm_cell_size_for_postfix(postfix);
1230 push_item(p, item -> parent);
1231 push_expr(p, item -> args);
1232 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1233 break;
1234 case MODE_FIELD:
1235 push_item(p, item -> parent);
1236 jvm_generate_load(p, item -> var -> gen_var);
1237 break;
1238 case MODE_DEREF:
1239 /* Все объекты в jvm представляются как указатели */
1240 push_item(p, item -> parent);
1241 break;
1242 case MODE_NIL:
1243 jvm_generate(p, 0, 1, "aconst_null");
1244 break;
1245 case MODE_NEW:
1246 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1247 break;
1248 case MODE_REAL:
1249 jvm_generate_push_float(p, item -> real, item -> result -> size);
1250 break;
1251 case MODE_STRING:
1252 jvm_generate_push_string(p, item -> string, item -> result -> size);
1253 break;
1254 case MODE_LEN:
1255 push_item(p, item -> parent);
1256 jvm_generate_array_len(p, item -> integer);
1257 jvm_generate_cast_prefix(p, 'i', jvm_get_postfix(item -> result));
1258 break;
1259 default:
1260 gen_error("push_item: unk mode %i", item -> mode);
1261 break;
1262 }
1263 }
1264
1265 static void
1266 jvm_generate_logical_not(gen_proc_t * p)
1267 {
1268 int label_done = jvm_new_label_id(p);
1269 int label_false = jvm_new_label_id(p);
1270
1271 jvm_generate(p, 1, 0, "ifne L%i", label_false);
1272 jvm_generate(p, 0, 1, "iconst_1");
1273 jvm_generate(p, 0, 0, "goto L%i", label_done);
1274 jvm_generate_label(p, label_false);
1275 jvm_generate(p, 0, 1, "iconst_0");
1276 jvm_generate_label(p, label_done);
1277 }
1278
1279 static void
1280 jvm_generate_abs(gen_proc_t * p, char prefix)
1281 {
1282 char t = jvm_get_type_of_prefix(prefix);
1283 int cell_size = jvm_cell_size_for_postfix(prefix);
1284 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1285 }
1286
1287 static char *
1288 jvm_get_compare_postfix(int op)
1289 {
1290 char * cmpop = "";
1291 switch(op)
1292 {
1293 case OP_EQ:
1294 cmpop = "eq";
1295 break;
1296 case OP_NEQ:
1297 cmpop = "ne";
1298 break;
1299 case OP_LSS:
1300 cmpop = "lt";
1301 break;
1302 case OP_LEQ:
1303 cmpop = "le";
1304 break;
1305 case OP_GRT:
1306 cmpop = "gt";
1307 break;
1308 case OP_GEQ:
1309 cmpop = "ge";
1310 break;
1311 default:
1312 gen_error("jvm_generate_compare_op: wat");
1313 break;
1314 }
1315 return cmpop;
1316 }
1317
1318 static void
1319 jvm_generate_compare_op(gen_proc_t * p, oberon_type_t * t, int op)
1320 {
1321 char prefix = jvm_get_prefix(t);
1322 int label_true = jvm_new_label_id(p);
1323 int label_done = jvm_new_label_id(p);
1324 int cell_size = jvm_cell_size_for_type(t);
1325 char * cmpop = jvm_get_compare_postfix(op);
1326
1327 if(prefix == 'l')
1328 {
1329 jvm_generate(p, 2 * cell_size, 1, "lcmp");
1330 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1331 }
1332 else if(prefix == 'f' || prefix == 'd')
1333 {
1334 char fop;
1335 if(op == OP_EQ || op == OP_NEQ || op == OP_GRT || op == OP_GEQ)
1336 {
1337 fop = 'l';
1338 }
1339 else
1340 {
1341 fop = 'g';
1342 }
1343 jvm_generate(p, 2 * cell_size, 1, "%ccmp%c", prefix, fop);
1344 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1345 }
1346 else if(prefix == 'a')
1347 {
1348 if(t -> class == OBERON_TYPE_STRING
1349 || (t -> class == OBERON_TYPE_POINTER && t -> base -> class == OBERON_TYPE_CHAR))
1350 {
1351 jvm_generate(p, 2, 1, "invokestatic SYSTEM/STRCMP([B[B)I");
1352 jvm_generate(p, 1, 0, "if%s L%i", cmpop, label_true);
1353 }
1354 else
1355 {
1356 jvm_generate(p, 1, 0, "if_acmp%s L%i", cmpop, label_true);
1357 }
1358 }
1359 else
1360 {
1361 jvm_generate(p, 2 * cell_size, 0, "if_%ccmp%s L%i", prefix, cmpop, label_true);
1362 }
1363
1364 jvm_generate(p, 0, 1, "iconst_0");
1365 jvm_generate(p, 0, 0, "goto L%i", label_done);
1366 jvm_generate_label(p, label_true);
1367 jvm_generate(p, 0, 1, "iconst_1");
1368 jvm_generate_label(p, label_done);
1369 }
1370
1371 static void
1372 jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
1373 {
1374 char prefix = jvm_get_prefix(t);
1375 int cell_size = jvm_cell_size_for_type(t);
1376 switch(op)
1377 {
1378 case OP_UNARY_MINUS:
1379 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1380 break;
1381 case OP_COMPLEMENTATION:
1382 jvm_generate_push_int_size(p, -1, t -> size);
1383 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1384 break;
1385 case OP_LOGIC_NOT:
1386 jvm_generate_logical_not(p);
1387 break;
1388 case OP_ABS:
1389 jvm_generate_abs(p, prefix);
1390 break;
1391 case OP_CAP:
1392 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Character/toUpperCase(I)I");
1393 break;
1394
1395 case OP_ADD:
1396 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1397 break;
1398 case OP_SUB:
1399 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1400 break;
1401 case OP_MUL:
1402 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1403 break;
1404 case OP_DIV:
1405 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1406 break;
1407 case OP_MOD:
1408 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1409 break;
1410 case OP_UNION:
1411 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1412 break;
1413 case OP_INTERSECTION:
1414 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1415 break;
1416 case OP_DIFFERENCE:
1417 /* (a - b) == a & ~b */
1418 jvm_generate_push_int_size(p, -1, t -> size);
1419 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1420 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1421 break;
1422 case OP_SYM_DIFFERENCE:
1423 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1424 break;
1425
1426 case OP_EQ:
1427 case OP_NEQ:
1428 case OP_LSS:
1429 case OP_LEQ:
1430 case OP_GRT:
1431 case OP_GEQ:
1432 jvm_generate_compare_op(p, t, op);
1433 break;
1434 default:
1435 gen_error("jvm_generate_operator: unk op %i", op);
1436 break;
1437 }
1438 }
1439
1440 static void
1441 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1442 {
1443 int label_calc_b = jvm_new_label_id(p);
1444 int label_done = jvm_new_label_id(p);
1445
1446 /* a OR b -- если a, то TRUE, иначе b */
1447
1448 push_expr(p, a);
1449 jvm_generate(p, 1, 0, "ifeq L%i", label_calc_b);
1450 jvm_generate(p, 0, 1, "iconst_1");
1451 jvm_generate(p, 0, 0, "goto L%i", label_done);
1452 jvm_generate_label(p, label_calc_b);
1453 push_expr(p, b);
1454 jvm_generate_label(p, label_done);
1455 }
1456
1457 static void
1458 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1459 {
1460 int label_false = jvm_new_label_id(p);
1461 int label_done = jvm_new_label_id(p);
1462
1463 /* a AND b -- если a, то b, иначе FALSE */
1464
1465 push_expr(p, a);
1466 jvm_generate(p, 1, 0, "ifeq L%i", label_false);
1467 push_expr(p, b);
1468 jvm_generate(p, 0, 0, "goto L%i", label_done);
1469 jvm_generate_label(p, label_false);
1470 jvm_generate(p, 0, 1, "iconst_0");
1471 jvm_generate_label(p, label_done);
1472 }
1473
1474 static void
1475 jvm_generate_range(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1476 {
1477 /* { a } == 1 << a */
1478 /* { a..b } == (a <= b) ? ((2 << b) - (1 << a)) : (0); */
1479
1480 char prefix;
1481 int cell_size;
1482 oberon_type_t * type;
1483 gen_var_t * ra;
1484 gen_var_t * rb;
1485 int label_else;
1486 int label_end;
1487
1488 type = a -> result;
1489 cell_size = jvm_cell_size_for_type(type);
1490 prefix = jvm_get_prefix(type);
1491
1492 if(b == NULL)
1493 {
1494 jvm_generate_push_int_size(p, 1, type -> size);
1495 push_expr(p, a);
1496 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1497 }
1498 else
1499 {
1500 ra = jvm_create_function_temp_var(p, type -> gen_type);
1501 rb = jvm_create_function_temp_var(p, type -> gen_type);
1502 jvm_generate_var(ra);
1503 jvm_generate_var(rb);
1504 jvm_generate_var_initialization(p, ra);
1505 jvm_generate_var_initialization(p, rb);
1506 label_else = jvm_new_label_id(p);
1507 label_end = jvm_new_label_id(p);
1508
1509 push_expr(p, a);
1510 jvm_generate_store(p, ra);
1511 push_expr(p, b);
1512 jvm_generate_store(p, rb);
1513
1514 jvm_generate_load(p, ra);
1515 jvm_generate_load(p, rb);
1516 jvm_generate(p, 2 * cell_size, 0, "if_%ccmpgt L%i", prefix, label_else);
1517
1518 jvm_generate_push_int_size(p, 2, type -> size);
1519 jvm_generate_load(p, rb);
1520 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1521 jvm_generate_push_int_size(p, 2, type -> size);
1522 jvm_generate_load(p, ra);
1523 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1524 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1525 jvm_generate(p, 0, 0, "goto L%i", label_end);
1526
1527 jvm_generate_label(p, label_else);
1528 jvm_generate_push_int_size(p, 0, type -> size);
1529 jvm_generate_label(p, label_end);
1530 }
1531
1532 /* TODO free registers */
1533 }
1534
1535 static void
1536 jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1537 {
1538 oberon_type_t * t = a -> result;
1539 int cell_size = jvm_cell_size_for_type(t);
1540 char prefix = jvm_get_prefix(t);
1541 int label_else = jvm_new_label_id(p);
1542 int label_end = jvm_new_label_id(p);
1543
1544 /* (a IN b) == (1 << a) & b */
1545 jvm_generate_push_int_size(p, 1, t -> size);
1546 push_expr(p, a);
1547 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1548 push_expr(p, b);
1549 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1550
1551 if(cell_size > 1)
1552 {
1553 jvm_generate(p, cell_size, 0, "lcmp");
1554 }
1555
1556 jvm_generate(p, 1, 0, "ifeq L%i", label_else);
1557 jvm_generate(p, 0, 1, "iconst_1");
1558 jvm_generate(p, 0, 0, "goto L%i", label_end);
1559 jvm_generate_label(p, label_else);
1560 jvm_generate(p, 0, 1, "iconst_0");
1561 jvm_generate_label(p, label_end);
1562 }
1563
1564 static void
1565 jvm_generate_ash(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1566 {
1567 oberon_type_t * t = a -> result;
1568 int cell_size = jvm_cell_size_for_type(t);
1569 char prefix = jvm_get_prefix(t);
1570 int label_else = jvm_new_label_id(p);
1571 int label_end = jvm_new_label_id(p);
1572
1573 /* if b < 0 then a << b else a >> b end */
1574
1575 push_expr(p, a);
1576 push_expr(p, b);
1577 if(cell_size == 1)
1578 {
1579 jvm_generate(p, cell_size, 2 * cell_size, "dup");
1580 }
1581 else
1582 {
1583 jvm_generate(p, cell_size, 2 * cell_size, "dup2");
1584 }
1585 jvm_generate_push_int_size(p, 0, t -> size);
1586 jvm_generate_compare_op(p, t, OP_LSS);
1587
1588 jvm_generate(p, cell_size, 0, "ifne L%i", label_else);
1589 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1590 jvm_generate(p, 0, 0, "goto L%i", label_end);
1591 jvm_generate_label(p, label_else);
1592 jvm_generate_abs(p, prefix);
1593 jvm_generate(p, 2 * cell_size, cell_size, "%cshr", prefix);
1594 jvm_generate_label(p, label_end);
1595 }
1596
1597 static void
1598 jvm_generate_entier(gen_proc_t * p, oberon_expr_t * x, oberon_type_t * res)
1599 {
1600 char prefix = jvm_get_prefix(x -> result);
1601 char postfix = jvm_get_postfix(res);
1602
1603 push_expr(p, x);
1604 jvm_generate_cast_prefix(p, prefix, 'd');
1605 jvm_generate(p, 2, 2, "invokestatic java/lang/Math/floor(D)D");
1606 jvm_generate_cast_prefix(p, 'd', postfix);
1607 }
1608
1609 static void
1610 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1611 {
1612 oberon_type_t * preq = oper -> left -> result;
1613 int op = oper -> op;
1614 switch(op)
1615 {
1616 case OP_CAST:
1617 push_expr(p, oper -> left);
1618 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1619 break;
1620 case OP_COMPLEMENTATION:
1621 case OP_UNARY_MINUS:
1622 case OP_LOGIC_NOT:
1623 case OP_ABS:
1624 case OP_CAP:
1625 push_expr(p, oper -> left);
1626 jvm_generate_operator(p, preq, op);
1627 break;
1628 case OP_ENTIER:
1629 jvm_generate_entier(p, oper -> left, oper -> result);
1630 break;
1631
1632 case OP_ADD:
1633 case OP_SUB:
1634 case OP_MUL:
1635 case OP_DIV:
1636 case OP_MOD:
1637
1638 case OP_UNION:
1639 case OP_INTERSECTION:
1640 case OP_DIFFERENCE:
1641 case OP_SYM_DIFFERENCE:
1642
1643 case OP_EQ:
1644 case OP_NEQ:
1645 case OP_LSS:
1646 case OP_LEQ:
1647 case OP_GRT:
1648 case OP_GEQ:
1649 push_expr(p, oper -> left);
1650 push_expr(p, oper -> right);
1651 jvm_generate_operator(p, preq, op);
1652 break;
1653
1654 case OP_LOGIC_OR:
1655 jvm_generate_logical_or(p, oper -> left, oper -> right);
1656 break;
1657 case OP_LOGIC_AND:
1658 jvm_generate_logical_and(p, oper -> left, oper -> right);
1659 break;
1660
1661 case OP_IS:
1662 preq = oper -> right -> result;
1663 char * cname = jvm_get_class_full_name(preq);
1664 push_expr(p, oper -> left);
1665 jvm_generate(p, 1, 1, "instanceof %s", cname);
1666 break;
1667 case OP_RANGE:
1668 jvm_generate_range(p, oper -> left, oper -> right);
1669 break;
1670 case OP_IN:
1671 jvm_generate_in(p, oper -> left, oper -> right);
1672 break;
1673
1674 case OP_ASH:
1675 jvm_generate_ash(p, oper -> left, oper -> right);
1676 break;
1677 default:
1678 gen_error("push_oper: unk op %i", op);
1679 break;
1680 }
1681 }
1682
1683 static void
1684 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1685 {
1686 if(expr -> is_item)
1687 {
1688 push_item(p, (oberon_item_t *) expr);
1689 }
1690 else
1691 {
1692 push_operator(p, (oberon_oper_t *) expr);
1693 }
1694 }
1695
1696 static void
1697 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1698 {
1699 assert(dst -> is_item);
1700 oberon_item_t * item = (oberon_item_t *) dst;
1701
1702 if(dst -> result -> class == OBERON_TYPE_ARRAY
1703 || src -> result -> class == OBERON_TYPE_ARRAY)
1704 {
1705 push_expr(p, dst);
1706 push_expr(p, src);
1707 jvm_generate_copy_array(p, dst -> result);
1708 }
1709 else if(dst -> result -> class == OBERON_TYPE_RECORD
1710 || src -> result -> class == OBERON_TYPE_RECORD)
1711 {
1712 push_expr(p, dst);
1713 push_expr(p, src);
1714 jvm_generate_copy_record(p, dst -> result);
1715 }
1716 else switch(item -> mode)
1717 {
1718 case MODE_VAR:
1719 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1720 push_expr(p, src);
1721 jvm_generate_store(p, item -> var -> gen_var);
1722 break;
1723 case MODE_INDEX:
1724 ;
1725 char postfix = jvm_get_postfix(src -> result);
1726 int cell_size = jvm_cell_size_for_postfix(postfix);
1727 assert(item -> parent -> is_item);
1728 push_item(p, (oberon_item_t *) item -> parent);
1729 push_expr(p, item -> args);
1730 push_expr(p, src);
1731 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1732 break;
1733 case MODE_FIELD:
1734 assert(item -> parent -> is_item);
1735 push_item(p, (oberon_item_t *) item -> parent);
1736 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1737 push_expr(p, src);
1738 jvm_generate_store(p, item -> var -> gen_var);
1739 break;
1740 default:
1741 gen_error("store_expr: unk mode %i", item -> mode);
1742 break;
1743 }
1744 }
1745
1746 void
1747 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1748 {
1749 gen_module_t * m;
1750 gen_proc_t * p;
1751
1752 m = ctx -> mod -> gen_mod;
1753 p = m -> class -> p;
1754
1755 store_expr(p, dst, src);
1756 }
1757
1758 void
1759 oberon_generate_copy(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1760 {
1761 gen_module_t * m;
1762 gen_proc_t * p;
1763 char * desc;
1764
1765 m = ctx -> mod -> gen_mod;
1766 p = m -> class -> p;
1767
1768 push_expr(p, src);
1769 push_expr(p, dst);
1770
1771 desc = jvm_get_descriptor(dst -> result);
1772
1773 jvm_generate(p, 2, 0, "invokestatic SYSTEM/COPY(%s%s)V", desc, desc);
1774 }
1775
1776 void
1777 oberon_generate_assert(oberon_context_t * ctx, oberon_expr_t * cond)
1778 {
1779 gen_module_t * m;
1780 gen_proc_t * p;
1781
1782 m = ctx -> mod -> gen_mod;
1783 p = m -> class -> p;
1784
1785 push_expr(p, cond);
1786 jvm_generate(p, 1, 0, "invokestatic SYSTEM/ASSERT(Z)V");
1787 }
1788
1789 void
1790 oberon_generate_assert_n(oberon_context_t * ctx, oberon_expr_t * cond, int64_t n)
1791 {
1792 gen_module_t * m;
1793 gen_proc_t * p;
1794
1795 m = ctx -> mod -> gen_mod;
1796 p = m -> class -> p;
1797
1798 push_expr(p, cond);
1799 jvm_generate_push_int_size(p, n, 8);
1800 jvm_generate(p, 1 + 2, 0, "invokestatic SYSTEM/ASSERT(ZJ)V");
1801 }
1802
1803 void
1804 oberon_generate_trap(oberon_context_t * ctx, int64_t n)
1805 {
1806 gen_module_t * m;
1807 gen_proc_t * p;
1808
1809 m = ctx -> mod -> gen_mod;
1810 p = m -> class -> p;
1811
1812 jvm_generate_push_int_size(p, n, 8);
1813 jvm_generate(p, 2, 0, "invokestatic SYSTEM/TRAP(J)V");
1814 }
1815
1816 void
1817 oberon_generate_halt(oberon_context_t * ctx, int64_t n)
1818 {
1819 gen_module_t * m;
1820 gen_proc_t * p;
1821
1822 m = ctx -> mod -> gen_mod;
1823 p = m -> class -> p;
1824
1825 jvm_generate_push_int_size(p, n, 8);
1826 jvm_generate(p, 2, 0, "invokestatic SYSTEM/HALT(J)V");
1827 }
1828
1829 void
1830 oberon_set_out_directory(oberon_context_t * ctx, const char * path)
1831 {
1832 gen_context_t * c;
1833
1834 c = ctx -> gen_context;
1835
1836 c -> dir = new_string(path);
1837 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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