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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(v);
890 jvm_generate_var_initialization(p, v);
891 break;
892 case OBERON_CLASS_PROC:
893 break;
894 default:
895 gen_error("jvm_generate_local_initialization: wat");
896 break;
897 }
898
899 if(x -> class == OBERON_CLASS_PARAM)
900 {
901 if(x -> type -> class == OBERON_TYPE_ARRAY)
902 {
903 jvm_generate_array_duplicate_and_replace(p, v, x -> type);
904 }
905 else if(x -> type -> class == OBERON_TYPE_RECORD)
906 {
907 jvm_generate_record_duplicate_and_replace(p, v, x -> type);
908 }
909 }
910 }
911
912 void
913 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
914 {
915 gen_proc_t * p;
916 char * name;
917 char * signature;
918 oberon_object_t * var;
919
920 p = proc -> gen_proc;
921
922 if(proc -> local)
923 {
924 signature = jvm_get_local_procedure_signature(proc);
925 }
926 else
927 {
928 oberon_generate_procedure_pointer_class(p -> class -> dir, proc);
929 signature = jvm_get_procedure_signature(proc -> type);
930 }
931
932 name = jvm_get_name(proc);
933 jvm_generate_function_header(p, "public static", name, signature);
934
935 if(proc -> local)
936 {
937 jvm_generate_staticlinks(proc);
938 }
939
940 jvm_generate_procedure_frame(proc);
941
942 /* Создание параметров и переменных */
943 var = proc -> scope -> list -> next;
944 while(var)
945 {
946 jvm_generate_local_object(p, var);
947 var = var -> next;
948 }
949
950 jvm_generate_frame_initialization(p);
951
952 /* Инициализация парамеров и переменных */
953 var = proc -> scope -> list -> next;
954 while(var)
955 {
956 jvm_generate_local_initialization(p, var);
957 var = var -> next;
958 }
959 }
960
961 void
962 oberon_generate_end_proc(oberon_context_t * ctx)
963 {
964 gen_module_t * m;
965 gen_proc_t * p;
966
967 m = ctx -> mod -> gen_mod;
968 p = m -> class -> p;
969
970 jvm_generate_function_end(p);
971 }
972
973 gen_label_t *
974 oberon_generator_reserve_label(oberon_context_t * ctx)
975 {
976 gen_module_t * m;
977 gen_proc_t * p;
978 gen_label_t * l;
979
980 m = ctx -> mod -> gen_mod;
981 p = m -> class -> p;
982
983 l = GC_MALLOC(sizeof *l);
984 memset(l, 0, sizeof *l);
985
986 l -> id = jvm_new_label_id(p);
987 return l;
988 }
989
990 void
991 oberon_generate_label(oberon_context_t * ctx, gen_label_t * l)
992 {
993 gen_module_t * m;
994 gen_proc_t * p;
995
996 m = ctx -> mod -> gen_mod;
997 p = m -> class -> p;
998
999 jvm_generate_label(p, l -> id);
1000 }
1001
1002 void
1003 oberon_generate_goto(oberon_context_t * ctx, gen_label_t * l)
1004 {
1005 gen_module_t * m;
1006 gen_proc_t * p;
1007
1008 m = ctx -> mod -> gen_mod;
1009 p = m -> class -> p;
1010
1011 jvm_generate(p, 0, 0, "goto L%i", l -> id);
1012 }
1013
1014 void
1015 oberon_generate_branch(oberon_context_t * ctx, oberon_expr_t * cond, bool gotoif, gen_label_t * l)
1016 {
1017 gen_module_t * m;
1018 gen_proc_t * p;
1019
1020 m = ctx -> mod -> gen_mod;
1021 p = m -> class -> p;
1022
1023 push_expr(p, cond);
1024
1025 if(gotoif == false)
1026 {
1027 /* переход если false */
1028 jvm_generate(p, 1, 0, "ifeq L%i", l -> id);
1029 }
1030 else
1031 {
1032 /* переход если true */
1033 jvm_generate(p, 1, 0, "ifne L%i", l -> id);
1034 }
1035 }
1036
1037 static void
1038 push_varptr(gen_proc_t * p, oberon_expr_t * expr)
1039 {
1040 assert(expr -> is_item);
1041
1042 switch(expr -> item.mode)
1043 {
1044 case MODE_VAR:
1045 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1046 break;
1047 case MODE_INDEX:
1048 push_item(p, (oberon_item_t *) expr -> item.parent);
1049 push_expr(p, expr -> item.args);
1050 break;
1051 case MODE_FIELD:
1052 push_item(p, (oberon_item_t *) expr -> item.parent);
1053 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1054 break;
1055 default:
1056 gen_error("push_varptr: wat %i", expr -> item.mode);
1057 break;
1058 }
1059 }
1060
1061 static void
1062 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1063 {
1064 assert(desig -> var == NULL);
1065 assert(desig -> mode == MODE_CALL);
1066
1067 bool direct_call = false;
1068 if(desig -> parent -> mode == MODE_VAR)
1069 {
1070 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1071 {
1072 direct_call = true;
1073 }
1074 }
1075
1076 oberon_type_t * procsig;
1077 procsig = desig -> parent -> result;
1078
1079 if(direct_call == false)
1080 {
1081 /* Загружаем указатель на процедуру */
1082 push_item(p, desig -> parent);
1083 }
1084
1085 if(direct_call)
1086 {
1087 jvm_generate_push_static_links(p, desig -> parent -> var);
1088 }
1089
1090 int args_cells = 0;
1091 int result_cells = jvm_cell_size_for_type(procsig -> base);
1092
1093 int num = desig -> num_args;
1094 oberon_expr_t * arg = desig -> args;
1095 oberon_object_t * param = procsig -> decl;
1096 for(int i = 0; i < num; i++)
1097 {
1098 if(param -> class == OBERON_CLASS_VAR_PARAM)
1099 {
1100 args_cells += 2;
1101 push_varptr(p, arg);
1102 }
1103 else
1104 {
1105 args_cells += jvm_cell_size_for_type(arg -> result);
1106 push_expr(p, arg);
1107 }
1108 arg = arg -> next;
1109 param = param -> next;
1110 }
1111
1112 if(direct_call)
1113 {
1114 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1115 char * signature = jvm_get_local_procedure_signature(desig -> parent -> var);
1116 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1117 }
1118 else
1119 {
1120 char * cname = jvm_get_class_full_name(procsig);
1121 char * signature = jvm_get_procedure_signature(procsig);
1122 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1123 }
1124 }
1125
1126 void
1127 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1128 {
1129 assert(desig -> is_item);
1130 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1131 }
1132
1133 void
1134 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1135 {
1136 gen_module_t * m;
1137 gen_proc_t * p;
1138 char prefix;
1139 int cell_size;
1140
1141 m = ctx -> mod -> gen_mod;
1142 p = m -> class -> p;
1143
1144 if(expr)
1145 {
1146 push_expr(p, expr);
1147 prefix = jvm_get_prefix(expr -> result);
1148 cell_size = jvm_cell_size_for_type(expr -> result);
1149 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1150 }
1151 else
1152 {
1153 jvm_generate(p, 0, 0, "return");
1154 }
1155 }
1156
1157 static void
1158 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1159 {
1160 assert(type -> class == OBERON_TYPE_POINTER);
1161
1162 for(int i = 0; i < num; i++)
1163 {
1164 push_expr(p, arg);
1165 arg = arg -> next;
1166 }
1167
1168 jvm_generate_new(p, type -> base, num);
1169 }
1170
1171 static void
1172 jvm_generate_cast_prefix(gen_proc_t * p, char prefix, char postfix)
1173 {
1174 if(prefix == postfix)
1175 {
1176 return;
1177 }
1178
1179 int from_cell_size = jvm_cell_size_for_postfix(prefix);
1180 int to_cell_size = jvm_cell_size_for_postfix(postfix);
1181 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1182 }
1183
1184 static void
1185 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1186 {
1187 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1188 {
1189 if(to -> class == OBERON_TYPE_POINTER && to -> base -> class == OBERON_TYPE_RECORD)
1190 {
1191 char * full_name = jvm_get_class_full_name(to);
1192 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1193 }
1194 }
1195 else
1196 {
1197 char prefix = jvm_get_prefix(from);
1198 char postfix = jvm_get_postfix(to);
1199 jvm_generate_cast_prefix(p, prefix, postfix);
1200 }
1201 }
1202
1203 static void
1204 push_item(gen_proc_t * p, oberon_item_t * item)
1205 {
1206 switch(item -> mode)
1207 {
1208 case MODE_VAR:
1209 if(item -> var -> class == OBERON_CLASS_PROC)
1210 {
1211 jvm_generate_push_procedure_pointer(p, item -> var);
1212 }
1213 else
1214 {
1215 jvm_generate_load(p, item -> var -> gen_var);
1216 }
1217 break;
1218 case MODE_INTEGER:
1219 case MODE_BOOLEAN:
1220 case MODE_CHAR:
1221 case MODE_SET:
1222 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1223 break;
1224 case MODE_CALL:
1225 jvm_generate_call_proc(p, item);
1226 break;
1227 case MODE_INDEX:
1228 ;
1229 char postfix = jvm_get_postfix(item -> result);
1230 int cell_size = jvm_cell_size_for_postfix(postfix);
1231 push_item(p, item -> parent);
1232 push_expr(p, item -> args);
1233 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1234 break;
1235 case MODE_FIELD:
1236 push_item(p, item -> parent);
1237 jvm_generate_load(p, item -> var -> gen_var);
1238 break;
1239 case MODE_DEREF:
1240 /* Все объекты в jvm представляются как указатели */
1241 push_item(p, item -> parent);
1242 break;
1243 case MODE_NIL:
1244 jvm_generate(p, 0, 1, "aconst_null");
1245 break;
1246 case MODE_NEW:
1247 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1248 break;
1249 case MODE_REAL:
1250 jvm_generate_push_float(p, item -> real, item -> result -> size);
1251 break;
1252 case MODE_STRING:
1253 jvm_generate_push_string(p, item -> string, item -> result -> size);
1254 break;
1255 case MODE_LEN:
1256 push_item(p, item -> parent);
1257 jvm_generate_array_len(p, item -> integer);
1258 jvm_generate_cast_prefix(p, 'i', jvm_get_postfix(item -> result));
1259 break;
1260 default:
1261 gen_error("push_item: unk mode %i", item -> mode);
1262 break;
1263 }
1264 }
1265
1266 static void
1267 jvm_generate_logical_not(gen_proc_t * p)
1268 {
1269 int label_done = jvm_new_label_id(p);
1270 int label_false = jvm_new_label_id(p);
1271
1272 jvm_generate(p, 1, 0, "ifne L%i", label_false);
1273 jvm_generate(p, 0, 1, "iconst_1");
1274 jvm_generate(p, 0, 0, "goto L%i", label_done);
1275 jvm_generate_label(p, label_false);
1276 jvm_generate(p, 0, 1, "iconst_0");
1277 jvm_generate_label(p, label_done);
1278 }
1279
1280 static void
1281 jvm_generate_abs(gen_proc_t * p, char prefix)
1282 {
1283 char t = jvm_get_type_of_prefix(prefix);
1284 int cell_size = jvm_cell_size_for_postfix(prefix);
1285 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1286 }
1287
1288 static char *
1289 jvm_get_compare_postfix(int op)
1290 {
1291 char * cmpop = "";
1292 switch(op)
1293 {
1294 case OP_EQ:
1295 cmpop = "eq";
1296 break;
1297 case OP_NEQ:
1298 cmpop = "ne";
1299 break;
1300 case OP_LSS:
1301 cmpop = "lt";
1302 break;
1303 case OP_LEQ:
1304 cmpop = "le";
1305 break;
1306 case OP_GRT:
1307 cmpop = "gt";
1308 break;
1309 case OP_GEQ:
1310 cmpop = "ge";
1311 break;
1312 default:
1313 gen_error("jvm_generate_compare_op: wat");
1314 break;
1315 }
1316 return cmpop;
1317 }
1318
1319 static void
1320 jvm_generate_compare_op(gen_proc_t * p, oberon_type_t * t, int op)
1321 {
1322 char prefix = jvm_get_prefix(t);
1323 int label_true = jvm_new_label_id(p);
1324 int label_done = jvm_new_label_id(p);
1325 int cell_size = jvm_cell_size_for_type(t);
1326 char * cmpop = jvm_get_compare_postfix(op);
1327
1328 if(prefix == 'l')
1329 {
1330 jvm_generate(p, 2 * cell_size, 1, "lcmp");
1331 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1332 }
1333 else if(prefix == 'f' || prefix == 'd')
1334 {
1335 char fop;
1336 if(op == OP_EQ || op == OP_NEQ || op == OP_GRT || op == OP_GEQ)
1337 {
1338 fop = 'l';
1339 }
1340 else
1341 {
1342 fop = 'g';
1343 }
1344 jvm_generate(p, 2 * cell_size, 1, "%ccmp%c", prefix, fop);
1345 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1346 }
1347 else if(prefix == 'a')
1348 {
1349 if(t -> class == OBERON_TYPE_STRING
1350 || (t -> class == OBERON_TYPE_POINTER && t -> base -> class == OBERON_TYPE_CHAR))
1351 {
1352 jvm_generate(p, 2, 1, "invokestatic SYSTEM/STRCMP([B[B)I");
1353 jvm_generate(p, 1, 0, "if%s L%i", cmpop, label_true);
1354 }
1355 else
1356 {
1357 jvm_generate(p, 1, 0, "if_acmp%s L%i", cmpop, label_true);
1358 }
1359 }
1360 else
1361 {
1362 jvm_generate(p, 2 * cell_size, 0, "if_%ccmp%s L%i", prefix, cmpop, label_true);
1363 }
1364
1365 jvm_generate(p, 0, 1, "iconst_0");
1366 jvm_generate(p, 0, 0, "goto L%i", label_done);
1367 jvm_generate_label(p, label_true);
1368 jvm_generate(p, 0, 1, "iconst_1");
1369 jvm_generate_label(p, label_done);
1370 }
1371
1372 static void
1373 jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
1374 {
1375 char prefix = jvm_get_prefix(t);
1376 int cell_size = jvm_cell_size_for_type(t);
1377 switch(op)
1378 {
1379 case OP_UNARY_MINUS:
1380 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1381 break;
1382 case OP_COMPLEMENTATION:
1383 jvm_generate_push_int_size(p, -1, t -> size);
1384 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1385 break;
1386 case OP_LOGIC_NOT:
1387 jvm_generate_logical_not(p);
1388 break;
1389 case OP_ABS:
1390 jvm_generate_abs(p, prefix);
1391 break;
1392 case OP_CAP:
1393 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Character/toUpperCase(I)I");
1394 break;
1395
1396 case OP_ADD:
1397 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1398 break;
1399 case OP_SUB:
1400 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1401 break;
1402 case OP_MUL:
1403 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1404 break;
1405 case OP_DIV:
1406 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1407 break;
1408 case OP_MOD:
1409 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1410 break;
1411 case OP_UNION:
1412 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1413 break;
1414 case OP_INTERSECTION:
1415 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1416 break;
1417 case OP_DIFFERENCE:
1418 /* (a - b) == a & ~b */
1419 jvm_generate_push_int_size(p, -1, t -> size);
1420 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1421 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1422 break;
1423 case OP_SYM_DIFFERENCE:
1424 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1425 break;
1426
1427 case OP_EQ:
1428 case OP_NEQ:
1429 case OP_LSS:
1430 case OP_LEQ:
1431 case OP_GRT:
1432 case OP_GEQ:
1433 jvm_generate_compare_op(p, t, op);
1434 break;
1435 default:
1436 gen_error("jvm_generate_operator: unk op %i", op);
1437 break;
1438 }
1439 }
1440
1441 static void
1442 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1443 {
1444 int label_calc_b = jvm_new_label_id(p);
1445 int label_done = jvm_new_label_id(p);
1446
1447 /* a OR b -- если a, то TRUE, иначе b */
1448
1449 push_expr(p, a);
1450 jvm_generate(p, 1, 0, "ifeq L%i", label_calc_b);
1451 jvm_generate(p, 0, 1, "iconst_1");
1452 jvm_generate(p, 0, 0, "goto L%i", label_done);
1453 jvm_generate_label(p, label_calc_b);
1454 push_expr(p, b);
1455 jvm_generate_label(p, label_done);
1456 }
1457
1458 static void
1459 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1460 {
1461 int label_false = jvm_new_label_id(p);
1462 int label_done = jvm_new_label_id(p);
1463
1464 /* a AND b -- если a, то b, иначе FALSE */
1465
1466 push_expr(p, a);
1467 jvm_generate(p, 1, 0, "ifeq L%i", label_false);
1468 push_expr(p, b);
1469 jvm_generate(p, 0, 0, "goto L%i", label_done);
1470 jvm_generate_label(p, label_false);
1471 jvm_generate(p, 0, 1, "iconst_0");
1472 jvm_generate_label(p, label_done);
1473 }
1474
1475 static void
1476 jvm_generate_range(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1477 {
1478 /* { a } == 1 << a */
1479 /* { a..b } == (a <= b) ? ((2 << b) - (1 << a)) : (0); */
1480
1481 char prefix;
1482 int cell_size;
1483 oberon_type_t * type;
1484 gen_var_t * ra;
1485 gen_var_t * rb;
1486 int label_else;
1487 int label_end;
1488
1489 type = a -> result;
1490 cell_size = jvm_cell_size_for_type(type);
1491 prefix = jvm_get_prefix(type);
1492
1493 if(b == NULL)
1494 {
1495 jvm_generate_push_int_size(p, 1, type -> size);
1496 push_expr(p, a);
1497 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1498 }
1499 else
1500 {
1501 ra = jvm_create_function_temp_var(p, type -> gen_type);
1502 rb = jvm_create_function_temp_var(p, type -> gen_type);
1503 jvm_generate_var(ra);
1504 jvm_generate_var(rb);
1505 jvm_generate_var_initialization(p, ra);
1506 jvm_generate_var_initialization(p, rb);
1507 label_else = jvm_new_label_id(p);
1508 label_end = jvm_new_label_id(p);
1509
1510 push_expr(p, a);
1511 jvm_generate_store(p, ra);
1512 push_expr(p, b);
1513 jvm_generate_store(p, rb);
1514
1515 jvm_generate_load(p, ra);
1516 jvm_generate_load(p, rb);
1517 jvm_generate(p, 2 * cell_size, 0, "if_%ccmpgt L%i", prefix, label_else);
1518
1519 jvm_generate_push_int_size(p, 2, type -> size);
1520 jvm_generate_load(p, rb);
1521 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1522 jvm_generate_push_int_size(p, 2, type -> size);
1523 jvm_generate_load(p, ra);
1524 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1525 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1526 jvm_generate(p, 0, 0, "goto L%i", label_end);
1527
1528 jvm_generate_label(p, label_else);
1529 jvm_generate_push_int_size(p, 0, type -> size);
1530 jvm_generate_label(p, label_end);
1531 }
1532
1533 /* TODO free registers */
1534 }
1535
1536 static void
1537 jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1538 {
1539 oberon_type_t * t = a -> result;
1540 int cell_size = jvm_cell_size_for_type(t);
1541 char prefix = jvm_get_prefix(t);
1542 int label_else = jvm_new_label_id(p);
1543 int label_end = jvm_new_label_id(p);
1544
1545 /* (a IN b) == (1 << a) & b */
1546 jvm_generate_push_int_size(p, 1, t -> size);
1547 push_expr(p, a);
1548 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1549 push_expr(p, b);
1550 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1551
1552 if(cell_size > 1)
1553 {
1554 jvm_generate(p, cell_size, 0, "lcmp");
1555 }
1556
1557 jvm_generate(p, 1, 0, "ifeq L%i", label_else);
1558 jvm_generate(p, 0, 1, "iconst_1");
1559 jvm_generate(p, 0, 0, "goto L%i", label_end);
1560 jvm_generate_label(p, label_else);
1561 jvm_generate(p, 0, 1, "iconst_0");
1562 jvm_generate_label(p, label_end);
1563 }
1564
1565 static void
1566 jvm_generate_ash(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1567 {
1568 oberon_type_t * t = a -> result;
1569 int cell_size = jvm_cell_size_for_type(t);
1570 char prefix = jvm_get_prefix(t);
1571 int label_else = jvm_new_label_id(p);
1572 int label_end = jvm_new_label_id(p);
1573
1574 /* if b < 0 then a << b else a >> b end */
1575
1576 push_expr(p, a);
1577 push_expr(p, b);
1578 if(cell_size == 1)
1579 {
1580 jvm_generate(p, cell_size, 2 * cell_size, "dup");
1581 }
1582 else
1583 {
1584 jvm_generate(p, cell_size, 2 * cell_size, "dup2");
1585 }
1586 jvm_generate_push_int_size(p, 0, t -> size);
1587 jvm_generate_compare_op(p, t, OP_LSS);
1588
1589 jvm_generate(p, cell_size, 0, "ifne L%i", label_else);
1590 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1591 jvm_generate(p, 0, 0, "goto L%i", label_end);
1592 jvm_generate_label(p, label_else);
1593 jvm_generate_abs(p, prefix);
1594 jvm_generate(p, 2 * cell_size, cell_size, "%cshr", prefix);
1595 jvm_generate_label(p, label_end);
1596 }
1597
1598 static void
1599 jvm_generate_entier(gen_proc_t * p, oberon_expr_t * x, oberon_type_t * res)
1600 {
1601 char prefix = jvm_get_prefix(x -> result);
1602 char postfix = jvm_get_postfix(res);
1603
1604 push_expr(p, x);
1605 jvm_generate_cast_prefix(p, prefix, 'd');
1606 jvm_generate(p, 2, 2, "invokestatic java/lang/Math/floor(D)D");
1607 jvm_generate_cast_prefix(p, 'd', postfix);
1608 }
1609
1610 static void
1611 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1612 {
1613 oberon_type_t * preq = oper -> left -> result;
1614 int op = oper -> op;
1615 switch(op)
1616 {
1617 case OP_CAST:
1618 push_expr(p, oper -> left);
1619 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1620 break;
1621 case OP_COMPLEMENTATION:
1622 case OP_UNARY_MINUS:
1623 case OP_LOGIC_NOT:
1624 case OP_ABS:
1625 case OP_CAP:
1626 push_expr(p, oper -> left);
1627 jvm_generate_operator(p, preq, op);
1628 break;
1629 case OP_ENTIER:
1630 jvm_generate_entier(p, oper -> left, oper -> result);
1631 break;
1632
1633 case OP_ADD:
1634 case OP_SUB:
1635 case OP_MUL:
1636 case OP_DIV:
1637 case OP_MOD:
1638
1639 case OP_UNION:
1640 case OP_INTERSECTION:
1641 case OP_DIFFERENCE:
1642 case OP_SYM_DIFFERENCE:
1643
1644 case OP_EQ:
1645 case OP_NEQ:
1646 case OP_LSS:
1647 case OP_LEQ:
1648 case OP_GRT:
1649 case OP_GEQ:
1650 push_expr(p, oper -> left);
1651 push_expr(p, oper -> right);
1652 jvm_generate_operator(p, preq, op);
1653 break;
1654
1655 case OP_LOGIC_OR:
1656 jvm_generate_logical_or(p, oper -> left, oper -> right);
1657 break;
1658 case OP_LOGIC_AND:
1659 jvm_generate_logical_and(p, oper -> left, oper -> right);
1660 break;
1661
1662 case OP_IS:
1663 preq = oper -> right -> result;
1664 char * cname = jvm_get_class_full_name(preq);
1665 push_expr(p, oper -> left);
1666 jvm_generate(p, 1, 1, "instanceof %s", cname);
1667 break;
1668 case OP_RANGE:
1669 jvm_generate_range(p, oper -> left, oper -> right);
1670 break;
1671 case OP_IN:
1672 jvm_generate_in(p, oper -> left, oper -> right);
1673 break;
1674
1675 case OP_ASH:
1676 jvm_generate_ash(p, oper -> left, oper -> right);
1677 break;
1678 default:
1679 gen_error("push_oper: unk op %i", op);
1680 break;
1681 }
1682 }
1683
1684 static void
1685 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1686 {
1687 if(expr -> is_item)
1688 {
1689 push_item(p, (oberon_item_t *) expr);
1690 }
1691 else
1692 {
1693 push_operator(p, (oberon_oper_t *) expr);
1694 }
1695 }
1696
1697 static void
1698 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1699 {
1700 assert(dst -> is_item);
1701 oberon_item_t * item = (oberon_item_t *) dst;
1702
1703 if(dst -> result -> class == OBERON_TYPE_ARRAY
1704 || src -> result -> class == OBERON_TYPE_ARRAY)
1705 {
1706 push_expr(p, dst);
1707 push_expr(p, src);
1708 jvm_generate_copy_array(p, dst -> result);
1709 }
1710 else if(dst -> result -> class == OBERON_TYPE_RECORD
1711 || src -> result -> class == OBERON_TYPE_RECORD)
1712 {
1713 push_expr(p, dst);
1714 push_expr(p, src);
1715 jvm_generate_copy_record(p, dst -> result);
1716 }
1717 else switch(item -> mode)
1718 {
1719 case MODE_VAR:
1720 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1721 push_expr(p, src);
1722 jvm_generate_store(p, item -> var -> gen_var);
1723 break;
1724 case MODE_INDEX:
1725 ;
1726 char postfix = jvm_get_postfix(src -> result);
1727 int cell_size = jvm_cell_size_for_postfix(postfix);
1728 assert(item -> parent -> is_item);
1729 push_item(p, (oberon_item_t *) item -> parent);
1730 push_expr(p, item -> args);
1731 push_expr(p, src);
1732 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1733 break;
1734 case MODE_FIELD:
1735 assert(item -> parent -> is_item);
1736 push_item(p, (oberon_item_t *) item -> parent);
1737 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1738 push_expr(p, src);
1739 jvm_generate_store(p, item -> var -> gen_var);
1740 break;
1741 default:
1742 gen_error("store_expr: unk mode %i", item -> mode);
1743 break;
1744 }
1745 }
1746
1747 void
1748 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1749 {
1750 gen_module_t * m;
1751 gen_proc_t * p;
1752
1753 m = ctx -> mod -> gen_mod;
1754 p = m -> class -> p;
1755
1756 store_expr(p, dst, src);
1757 }
1758
1759 void
1760 oberon_generate_copy(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1761 {
1762 gen_module_t * m;
1763 gen_proc_t * p;
1764 char * desc;
1765
1766 m = ctx -> mod -> gen_mod;
1767 p = m -> class -> p;
1768
1769 push_expr(p, src);
1770 push_expr(p, dst);
1771
1772 desc = jvm_get_descriptor(dst -> result);
1773
1774 jvm_generate(p, 2, 0, "invokestatic SYSTEM/COPY(%s%s)V", desc, desc);
1775 }
1776
1777 void
1778 oberon_generate_assert(oberon_context_t * ctx, oberon_expr_t * cond)
1779 {
1780 gen_module_t * m;
1781 gen_proc_t * p;
1782
1783 m = ctx -> mod -> gen_mod;
1784 p = m -> class -> p;
1785
1786 push_expr(p, cond);
1787 jvm_generate(p, 1, 0, "invokestatic SYSTEM/ASSERT(Z)V");
1788 }
1789
1790 void
1791 oberon_generate_assert_n(oberon_context_t * ctx, oberon_expr_t * cond, int64_t n)
1792 {
1793 gen_module_t * m;
1794 gen_proc_t * p;
1795
1796 m = ctx -> mod -> gen_mod;
1797 p = m -> class -> p;
1798
1799 push_expr(p, cond);
1800 jvm_generate_push_int_size(p, n, 8);
1801 jvm_generate(p, 1 + 2, 0, "invokestatic SYSTEM/ASSERT(ZJ)V");
1802 }
1803
1804 void
1805 oberon_generate_trap(oberon_context_t * ctx, int64_t n)
1806 {
1807 gen_module_t * m;
1808 gen_proc_t * p;
1809
1810 m = ctx -> mod -> gen_mod;
1811 p = m -> class -> p;
1812
1813 jvm_generate_push_int_size(p, n, 8);
1814 jvm_generate(p, 2, 0, "invokestatic SYSTEM/TRAP(J)V");
1815 }
1816
1817 void
1818 oberon_generate_halt(oberon_context_t * ctx, int64_t n)
1819 {
1820 gen_module_t * m;
1821 gen_proc_t * p;
1822
1823 m = ctx -> mod -> gen_mod;
1824 p = m -> class -> p;
1825
1826 jvm_generate_push_int_size(p, n, 8);
1827 jvm_generate(p, 2, 0, "invokestatic SYSTEM/HALT(J)V");
1828 }
1829
1830 void
1831 oberon_set_out_directory(oberon_context_t * ctx, const char * path)
1832 {
1833 gen_context_t * c;
1834
1835 c = ctx -> gen_context;
1836
1837 c -> dir = new_string(path);
1838 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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