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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 "../../oberon-internals.h"
12 #include "generator-jvm.h"
13 #include "generator-jvm-abi.h"
14 #include "generator-jvm-asm.h"
15 #include "generator-jvm-basic.h"
16
17 static void
18 push_item(gen_proc_t * p, oberon_item_t * item);
19
20 static void
21 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num);
22
23 /*
24 * Генерирует код для инициализации массива со статическим базовым типом
25 * ( aref -- )
26 */
27
28 static void
29 jvm_generate_array_initialization(gen_proc_t * p, oberon_type_t * arr)
30 {
31 int dim = 0;
32 oberon_type_t * base = arr;
33 while(base -> class == OBERON_TYPE_ARRAY)
34 {
35 dim += 1;
36 base = base -> base;
37 }
38
39 if(base -> class != OBERON_TYPE_RECORD)
40 {
41 jvm_generate(p, 1, 0, "pop");
42 return;
43 }
44
45 struct {
46 int reg_index;
47 int reg_length;
48 int start;
49 int end;
50 } loop[dim];
51
52 int reg_dst;
53 reg_dst = jvm_alloc_register_untyped(p -> rf, false);
54 jvm_generate(p, 1, 0, "astore %i", reg_dst);
55
56 /*
57 * Входящие параметры заграблены.
58 * Теперь генерируем эквивалентный код:
59 * int i = 0;
60 * int len = dst.length
61 * while(i < len)
62 * {
63 * ...
64 * {
65 * dst[i, ...] = new record;
66 * }
67 * ...
68 * i += 1;
69 * }
70 * Где "..." такой же код (начало и конец) для следующей размерности.
71 */
72
73 for(int i = 0; i < dim; i++)
74 {
75 loop[i].reg_index = jvm_alloc_register_untyped(p -> rf, false);
76 loop[i].reg_length = jvm_alloc_register_untyped(p -> rf, false);
77 loop[i].start = jvm_new_label_id(p);
78 loop[i].end = jvm_new_label_id(p);
79
80 jvm_generate(p, 0, 1, "iconst_0");
81 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_index);
82
83 jvm_generate(p, 0, 1, "aload %i", reg_dst);
84 jvm_generate(p, 1, 1, "arraylength");
85 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_length);
86
87 /* if(i >= len) goto end; */
88 jvm_generate_label(p, loop[i].start);
89 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
90 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_length);
91 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
92 }
93
94 jvm_generate(p, 0, 1, "aload %i", reg_dst);
95 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
96 for(int i = 1; i < dim; i++)
97 {
98 jvm_generate(p, 2, 1, "aaload");
99 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
100 }
101 jvm_generate_new(p, base, 0);
102 jvm_generate(p, 3, 0, "aastore");
103
104 for(int i = dim - 1; i >= 0; i--)
105 {
106 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].reg_index);
107 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
108 jvm_generate_label(p, loop[i].end);
109 }
110 }
111
112 static void
113 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num)
114 {
115 int dim;
116 char * cname;
117 char * desc;
118 oberon_type_t * base;
119
120 switch(type -> class)
121 {
122 case OBERON_TYPE_INTEGER:
123 case OBERON_TYPE_BOOLEAN:
124 case OBERON_TYPE_PROCEDURE:
125 case OBERON_TYPE_REAL:
126 case OBERON_TYPE_POINTER:
127 gen_error("jvm_generate_new_static: static alocation not allowed");
128 break;
129 case OBERON_TYPE_RECORD:
130 assert(num == 0);
131 cname = jvm_get_class_full_name(type);
132 jvm_generate(p, 0, 1, "new %s", cname);
133 jvm_generate(p, 1, 2, "dup");
134 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", cname);
135 break;
136 case OBERON_TYPE_ARRAY:
137 dim = 0;
138 base = type;
139 desc = jvm_get_descriptor(type);
140 while(base -> class == OBERON_TYPE_ARRAY)
141 {
142 if(num > 0)
143 {
144 assert(base -> size == 0);
145 num -= 1;
146 }
147 else
148 {
149 assert(base -> size > 0);
150 jvm_generate_push_int(p, base -> size);
151 }
152 dim += 1;
153 base = base -> base;
154 }
155
156 assert(num == 0);
157 jvm_generate(p, dim, 1, "multianewarray %s %i", desc, dim);
158 jvm_generate(p, 1, 2, "dup");
159 jvm_generate_array_initialization(p, type);
160 break;
161 default:
162 gen_error("jvm_generate_new_static: unk type class %i", type -> class);
163 break;
164 }
165 }
166
167 /*
168 * Генерирует код для копирования полей из первой записи во вторую.
169 * ( aref_dst aref_src -- )
170 * dst := src;
171 */
172
173 static void
174 jvm_generate_copy_record(gen_proc_t * p, oberon_type_t * rec)
175 {
176 assert(rec -> class == OBERON_TYPE_RECORD);
177 char * desc = jvm_get_descriptor(rec);
178 char * cname = jvm_get_class_full_name(rec);
179 jvm_generate(p, 1 + 1, 0, "invokestatic %s/$COPY$(%s%s)V", cname, desc, desc);
180 }
181
182 /*
183 * Генерирует кода для копирования массивов.
184 * ( aref_dst aref_src -- )
185 * dst := src;
186 */
187
188 static void
189 jvm_generate_copy_array(gen_proc_t * p, oberon_type_t * arr)
190 {
191 int dim = 0;
192 oberon_type_t * base = arr;
193 while(base -> class == OBERON_TYPE_ARRAY)
194 {
195 dim += 1;
196 base = base -> base;
197 }
198
199 struct {
200 int reg_index;
201 int reg_length;
202 int start;
203 int end;
204 } loop[dim];
205
206 int reg_dst = jvm_alloc_register_untyped(p -> rf, false);
207 int reg_src = jvm_alloc_register_untyped(p -> rf, false);
208 jvm_generate(p, 1, 0, "astore %i", reg_src);
209 jvm_generate(p, 1, 0, "astore %i", reg_dst);
210
211 /*
212 * Входящие параметры заграблены.
213 * Теперь генерируем эквивалентный код:
214 * int i = 0;
215 * int len = src.length
216 * while(i < len)
217 * {
218 * ...
219 * {
220 * copy from src[i, ...] to dst[i, ...];
221 * }
222 * ...
223 * i += 1;
224 * }
225 * Где "..." такой же код (начало и конец) для следующей размерности.
226 */
227
228 for(int i = 0; i < dim; i++)
229 {
230 loop[i].reg_index = jvm_alloc_register_untyped(p -> rf, false);
231 loop[i].reg_length = jvm_alloc_register_untyped(p -> rf, false);
232 loop[i].start = jvm_new_label_id(p);
233 loop[i].end = jvm_new_label_id(p);
234
235 jvm_generate(p, 0, 1, "iconst_0");
236 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_index);
237
238 jvm_generate(p, 0, 1, "aload %i", reg_src);
239 jvm_generate(p, 1, 1, "arraylength");
240 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_length);
241
242 /* if(i >= len) goto end; */
243 jvm_generate_label(p, loop[i].start);
244 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
245 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_length);
246 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
247 }
248
249 if(base -> class == OBERON_TYPE_RECORD)
250 {
251 /* Получаем записи по индексам ( -- dst src ) */
252
253 jvm_generate(p, 0, 1, "aload %i", reg_dst);
254 for(int i = 0; i < dim; i++)
255 {
256 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
257 jvm_generate(p, 2, 1, "aaload");
258 }
259
260 jvm_generate(p, 0, 1, "aload %i", reg_src);
261 for(int i = 0; i < dim; i++)
262 {
263 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
264 jvm_generate(p, 2, 1, "aaload");
265 }
266
267 /* Копируем записи ( dst src -- ) */
268 jvm_generate_copy_record(p, base);
269 }
270 else
271 {
272 char postfix = jvm_get_postfix(base);
273 int cell_size = jvm_cell_size_for_postfix(postfix);
274
275 /* Получаем массивы и индексы ( -- dst i src i ) */
276
277 jvm_generate(p, 0, 1, "aload %i", reg_dst);
278 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
279 for(int i = 1; i < dim; i++)
280 {
281 jvm_generate(p, 2, 1, "aaload");
282 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
283 }
284
285 jvm_generate(p, 0, 1, "aload %i", reg_src);
286 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
287 for(int i = 1; i < dim; i++)
288 {
289 jvm_generate(p, 2, 1, "aaload");
290 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
291 }
292
293 /* Копируем значения ( dst i src i -- ) */
294 jvm_generate(p, 2, cell_size, "%caload", postfix);
295 jvm_generate(p, 2 + cell_size, 0, "%castore", postfix);
296 }
297
298 for(int i = dim - 1; i >= 0; i--)
299 {
300 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].reg_index);
301 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
302 jvm_generate_label(p, loop[i].end);
303 }
304 }
305
306 static void
307 jvm_generate_push_procedure_pointer(gen_proc_t * p, oberon_object_t * proc)
308 {
309 char * full_name = jvm_get_field_full_name_safe(proc);
310 char * desc = jvm_get_descriptor(proc -> type);
311 jvm_generate(p, 0, 1, "getstatic %s/pointer %s", full_name, desc);
312 }
313
314 void
315 oberon_generator_init_context(oberon_context_t * ctx)
316 {
317 gen_context_t * gen_context = GC_MALLOC(sizeof *gen_context);
318 memset(gen_context, 0, sizeof *gen_context);
319
320 ctx -> gen_context = gen_context;
321 gen_context -> dir = ".";
322 }
323
324 void
325 oberon_generator_destroy_context(oberon_context_t * ctx)
326 {
327 }
328
329 static void
330 oberon_generate_procedure_class(const char * dir, oberon_type_t * proc)
331 {
332 FILE * fp;
333 char * cname;
334 char * signature;
335 struct gen_class * class;
336
337 cname = jvm_get_class_full_name(proc);
338 class = jvm_create_class(dir, cname);
339 fp = class -> fp;
340
341 fprintf(fp, ".source SYSTEM\n");
342 fprintf(fp, ".class public abstract %s\n", cname);
343 fprintf(fp, ".super java/lang/Object\n\n");
344
345 fprintf(fp, ".method <init>()V\n");
346 fprintf(fp, " aload_0\n");
347 fprintf(fp, " invokespecial java/lang/Object/<init>()V\n");
348 fprintf(fp, " return\n");
349 fprintf(fp, ".end method\n\n");
350
351 signature = jvm_get_procedure_signature(proc);
352
353 fprintf(fp, ".method public abstract invoke%s\n", signature);
354 fprintf(fp, ".end method\n\n");
355
356 jvm_destroy_class(class);
357 }
358
359 static void
360 oberon_generate_procedure_pointer_class(const char * dir, oberon_object_t * proc)
361 {
362 FILE * fp;
363 char * cname;
364 char * abscname;
365 char * absdesc;
366 char * signature;
367 struct gen_class * class;
368
369 cname = jvm_get_field_full_name_safe(proc);
370 class = jvm_create_class(dir, cname);
371 abscname = jvm_get_class_full_name(proc -> type);
372 absdesc = jvm_get_descriptor(proc -> type);
373 fp = class -> fp;
374
375 fprintf(fp, ".source %s\n", proc -> module -> name);
376 fprintf(fp, ".class public %s\n", cname);
377 fprintf(fp, ".super %s\n\n", abscname);
378
379 fprintf(fp, ".field public static pointer %s\n\n", absdesc);
380
381 fprintf(fp, ".method private <init>()V\n");
382 fprintf(fp, " aload_0\n");
383 fprintf(fp, " invokespecial %s/<init>()V\n", abscname);
384 fprintf(fp, " return\n");
385 fprintf(fp, ".end method\n\n");
386
387 fprintf(fp, ".method static <clinit>()V\n");
388 fprintf(fp, " .limit stack 2\n");
389 fprintf(fp, " new %s\n", cname);
390 fprintf(fp, " dup\n");
391 fprintf(fp, " invokespecial %s/<init>()V\n", cname);
392 fprintf(fp, " putstatic %s/pointer %s\n", cname, absdesc);
393 fprintf(fp, " return\n");
394 fprintf(fp, ".end method\n\n");
395
396 signature = jvm_get_procedure_signature(proc -> type);
397
398 gen_proc_t * p = jvm_create_proc(class);
399 jvm_generate_function_header(p, "public", "invoke", signature);
400 jvm_alloc_register_untyped(p -> rf, false);
401
402 int use_size = 0;
403 int num = proc -> type -> num_decl;
404 oberon_object_t * param = proc -> type -> decl;
405 for(int i = 0; i < num; i++)
406 {
407 gen_type_t * t = param -> type -> gen_type;
408 if(param -> class == OBERON_CLASS_VAR_PARAM)
409 {
410 int reg = jvm_alloc_register_untyped(p -> rf, true);
411 jvm_generate(p, 0, 1, "aload %i", reg);
412 jvm_generate(p, 0, 1, "iload %i", reg + 1);
413 }
414 else
415 {
416 int reg = jvm_alloc_register_untyped(p -> rf, t -> wide);
417 jvm_generate(p, 0, t -> cell_size, "%cload %i", t -> prefix, reg);
418 }
419 use_size += t -> cell_size;
420 param = param -> next;
421 }
422
423 char * full_name = jvm_get_field_full_name(proc);
424 int cell_size = jvm_cell_size_for_type(proc -> type -> base);
425 jvm_generate(p, use_size, cell_size, "invokestatic %s%s", full_name, signature);
426
427 if(proc -> type -> base -> class == OBERON_TYPE_NOTYPE)
428 {
429 jvm_generate(p, 0, 0, "return");
430 }
431 else
432 {
433 char prefix = jvm_get_prefix(proc -> type -> base);
434 jvm_generate(p, cell_size, 0, "%creturn", prefix);
435 }
436
437 jvm_generate_function_end(p);
438
439 jvm_destroy_class(class);
440 }
441
442 static void
443 oberon_generate_record_class(const char * dir, gen_module_t * m, oberon_type_t * rec)
444 {
445 char * cname;
446 struct gen_class * class;
447
448 /* Устанавливаем новоый id */
449 rec -> gen_type -> rec_id = m -> rec_id;
450 m -> rec_id += 1;
451
452 cname = jvm_get_class_full_name(rec);
453 class = jvm_create_class(dir, cname);
454
455 fprintf(class -> fp, ".source %s\n", rec -> module -> name);
456 fprintf(class -> fp, ".class public %s\n", cname);
457
458 if(rec -> base == NULL)
459 {
460 fprintf(class -> fp, ".super java/lang/Object\n\n");
461 }
462 else
463 {
464 class -> base = rec -> base -> gen_type -> class;
465 fprintf(class -> fp, ".super %s\n\n", class -> base -> full_name);
466 }
467
468 rec -> gen_type -> class = class;
469 }
470
471 void
472 oberon_generator_init_type(oberon_context_t * ctx, oberon_type_t * type)
473 {
474 gen_type_t * t = GC_MALLOC(sizeof *t);
475 memset(t, 0, sizeof *t);
476 type -> gen_type = t;
477
478 gen_context_t * c;
479 c = ctx -> gen_context;
480
481 gen_module_t * m;
482 switch(type -> class)
483 {
484 case OBERON_TYPE_NOTYPE:
485 case OBERON_TYPE_INTEGER:
486 case OBERON_TYPE_BOOLEAN:
487 case OBERON_TYPE_ARRAY:
488 case OBERON_TYPE_POINTER:
489 case OBERON_TYPE_REAL:
490 case OBERON_TYPE_CHAR:
491 case OBERON_TYPE_STRING:
492 case OBERON_TYPE_SET:
493 case OBERON_TYPE_NIL:
494 case OBERON_TYPE_SYSTEM_BYTE:
495 case OBERON_TYPE_SYSTEM_PTR:
496 break;
497 case OBERON_TYPE_RECORD:
498 m = type -> module -> gen_mod;
499 oberon_generate_record_class(c -> dir, m, type);
500 break;
501 case OBERON_TYPE_PROCEDURE:
502 oberon_generate_procedure_class(c -> dir, type);
503 break;
504 default:
505 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
506 break;
507 }
508
509 if(type -> class != OBERON_TYPE_NOTYPE)
510 {
511 t -> wide = jvm_is_wide_type(type);
512 t -> prefix = jvm_get_prefix(type);
513 t -> postfix = jvm_get_postfix(type);
514 }
515
516 t -> cell_size = jvm_cell_size_for_type(type);
517
518 if(type -> class != OBERON_TYPE_NIL)
519 {
520 t -> desc = jvm_get_descriptor(type);
521 }
522 }
523
524 void
525 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
526 {
527 struct gen_class * class;
528 class = rec -> gen_type -> class;
529
530 int num = rec -> num_decl;
531 oberon_object_t * field = rec -> decl;
532 for(int i = 0; i < num; i++)
533 {
534 jvm_generate_var(field -> gen_var);
535 field = field -> next;
536 }
537
538 /* Стандартный конструктор класса */
539 /* Инициализирует внутренние статические записи и массивы */
540 gen_proc_t * p = jvm_create_proc(class);
541 jvm_generate_function_header(p, "public", "<init>", "()V");
542 jvm_alloc_register_untyped(p -> rf, false);
543 jvm_generate(p, 0, 1, "aload_0");
544 if(class -> base)
545 {
546 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
547 }
548 else
549 {
550 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
551 }
552 num = rec -> num_decl;
553 field = rec -> decl;
554 for(int i = 0; i < num; i++)
555 {
556 jvm_generate(p, 0, 1, "aload_0");
557 jvm_generate_var_initialization(p, field -> gen_var);
558
559 if(field -> type -> class == OBERON_TYPE_RECORD
560 || field -> type -> class == OBERON_TYPE_ARRAY)
561 {
562 jvm_generate(p, 0, 1, "aload_0");
563 jvm_generate_ldst_prepare(p, field -> gen_var);
564 jvm_generate_new(p, field -> type, 0);
565 jvm_generate_store(p, field -> gen_var);
566 }
567 field = field -> next;
568 }
569 jvm_generate(p, 0, 0, "return");
570 jvm_generate_function_end(p);
571
572 /* Метод для копирования полей класса */
573 /* reg0 == src -> reg1 == dst */
574 p = jvm_create_proc(class);
575 char * signature = new_string("(%s%s)V", rec -> gen_type -> desc, rec -> gen_type -> desc);
576 jvm_generate_function_header(p, "public static", "$COPY$", signature);
577
578 gen_var_t * copy_dst = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "dst", rec -> gen_type);
579 gen_var_t * copy_src = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "src", rec -> gen_type);
580 jvm_generate_var(copy_dst);
581 jvm_generate_var(copy_src);
582 jvm_generate_var_initialization(p, copy_dst);
583 jvm_generate_var_initialization(p, copy_src);
584
585 num = rec -> num_decl;
586 field = rec -> decl;
587 for(int i = 0; i < num; i++)
588 {
589 if(field -> type -> class == OBERON_TYPE_RECORD)
590 {
591 jvm_generate_load(p, copy_dst);
592 jvm_generate_load(p, field -> gen_var);
593 jvm_generate_load(p, copy_src);
594 jvm_generate_load(p, field -> gen_var);
595 jvm_generate_copy_record(p, field -> type);
596 }
597 else if(field -> type -> class == OBERON_TYPE_ARRAY)
598 {
599 jvm_generate_load(p, copy_dst);
600 jvm_generate_load(p, field -> gen_var);
601 jvm_generate_load(p, copy_src);
602 jvm_generate_load(p, field -> gen_var);
603 jvm_generate_copy_array(p, field -> type);
604 }
605 else
606 {
607 jvm_generate_load(p, copy_dst);
608 jvm_generate_ldst_prepare(p, field -> gen_var);
609 jvm_generate_load(p, copy_src);
610 jvm_generate_load(p, field -> gen_var);
611 jvm_generate_store(p, field -> gen_var);
612 }
613 field = field -> next;
614 }
615 jvm_generate(p, 0, 0, "return");
616 jvm_generate_function_end(p);
617
618 jvm_destroy_class(class);
619 }
620
621 void
622 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
623 {
624 gen_module_t * m;
625 m = ctx -> mod -> gen_mod;
626
627 struct gen_class * class;
628 class = m -> class;
629
630 gen_proc_t * p;
631 struct gen_class * c;
632 char * name = var -> name;
633 gen_type_t * t = var -> type -> gen_type;
634
635 assert(name);
636 if(t == NULL)
637 {
638 gen_error("uninitialized type class %i", var -> type -> class);
639 }
640
641 switch(var -> class)
642 {
643 case OBERON_CLASS_VAR_PARAM:
644 p = var -> parent -> gen_proc;
645 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VARPTR, name, t);
646 break;
647 case OBERON_CLASS_PARAM:
648 p = var -> parent -> gen_proc;
649 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VAR, name, t);
650 break;
651 case OBERON_CLASS_FIELD:
652 c = var -> parent_type -> gen_type -> class;
653 var -> gen_var = jvm_create_class_var(c, JVM_STORAGE_FIELD_VAR, name, t);
654 break;
655 case OBERON_CLASS_VAR:
656 if(var -> local)
657 {
658 p = var -> parent -> gen_proc;
659 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_VAR, name, t);
660 }
661 else
662 {
663 var -> gen_var = jvm_create_class_var(class, JVM_STORAGE_STATIC_VAR, name, t);
664 jvm_generate_var(var -> gen_var);
665 }
666 break;
667 default:
668 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
669 break;
670 }
671 }
672
673 void
674 oberon_generator_init_temp_var(oberon_context_t * ctx, oberon_object_t * var)
675 {
676 assert(var -> class == OBERON_CLASS_VAR);
677
678 gen_module_t * m;
679 m = ctx -> mod -> gen_mod;
680
681 gen_proc_t * p;
682 p = m -> class -> p;
683
684 gen_type_t * t;
685 t = var -> type -> gen_type;
686
687 var -> gen_var = jvm_create_function_temp_var(p, t);
688 jvm_generate_var(var -> gen_var);
689 jvm_generate_var_initialization(p, var -> gen_var);
690 }
691
692 void
693 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
694 {
695 struct gen_class * class = proc -> module -> gen_mod -> class;
696 proc -> gen_proc = jvm_create_proc(class);
697 proc -> gen_proc -> full_name = jvm_get_field_full_name_safe(proc);
698 jvm_create_static_links(proc);
699 }
700
701 void
702 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
703 {
704 gen_module_t * m = GC_MALLOC(sizeof *m);
705 memset(m, 0, sizeof *m);
706 mod -> gen_mod = m;
707
708 gen_context_t * c;
709 c = ctx -> gen_context;
710
711 struct gen_class * class;
712 class = jvm_create_class(c -> dir, mod -> name);
713
714 fprintf(class -> fp, ".source %s\n", mod -> name);
715 fprintf(class -> fp, ".class %s\n", mod -> name);
716 fprintf(class -> fp, ".super java/lang/Object\n\n");
717
718 fprintf(class -> fp, ".field private static $INITIALIZED$ Z\n\n");
719
720 m -> class = class;
721
722 c -> current_m = m;
723 }
724
725 void
726 oberon_generator_fini_module(oberon_module_t * mod)
727 {
728 jvm_destroy_class(mod -> gen_mod -> class);
729 }
730
731 static void
732 push_expr(gen_proc_t * p, oberon_expr_t * expr);
733
734 void
735 oberon_generate_begin_module(oberon_context_t * ctx)
736 {
737 gen_proc_t * p;
738 int label_cont;
739 struct gen_class * class;
740
741 class = ctx -> mod -> gen_mod -> class;
742
743 p = jvm_create_proc(class);
744 jvm_generate_function_header(p, "public static", "BEGIN", "()V");
745
746 label_cont = jvm_new_label_id(p);
747 jvm_generate(p, 0, 1, "getstatic %s/$INITIALIZED$ Z", class -> full_name);
748 jvm_generate(p, 1, 0, "ifeq L%i", label_cont);
749 jvm_generate(p, 0, 0, "return");
750 jvm_generate_label(p, label_cont);
751
752 jvm_generate(p, 0, 1, "iconst_1");
753 jvm_generate(p, 1, 0, "putstatic %s/$INITIALIZED$ Z", class -> full_name);
754
755 /* Инициализация переменных объявленных в модуле */
756 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
757 while(x != NULL)
758 {
759 if(x -> class == OBERON_CLASS_MODULE)
760 {
761 if(!x -> module -> intrinsic)
762 {
763 jvm_generate(p, 0, 0, "invokestatic %s/BEGIN()V", x -> module -> gen_mod -> class -> full_name);
764 }
765 }
766 else if(x -> class == OBERON_CLASS_VAR)
767 {
768 jvm_generate_var_initialization(p, x -> gen_var);
769 if(x -> type -> class == OBERON_TYPE_ARRAY
770 || x -> type -> class == OBERON_TYPE_RECORD)
771 {
772 jvm_generate_ldst_prepare(p, x -> gen_var);
773 jvm_generate_new(p, x -> type, 0);
774 jvm_generate_store(p, x -> gen_var);
775 }
776 }
777
778 x = x -> next;
779 }
780 }
781
782 void
783 oberon_generate_end_module(oberon_context_t * ctx)
784 {
785 struct gen_class * class = ctx -> mod -> gen_mod -> class;
786 gen_proc_t * p = class -> p;
787
788 jvm_generate(p, 0, 0, "return");
789 jvm_generate_function_end(class -> p);
790
791 p = jvm_create_proc(class);
792 jvm_generate_function_header(p, "private", "<init>", "()V");
793 jvm_alloc_register_untyped(p -> rf, false);
794 jvm_generate(p, 0, 1, "aload_0");
795 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
796 jvm_generate(p, 0, 0, "return");
797 jvm_generate_function_end(class -> p);
798 }
799
800 /*
801 * Генерирует код для получения размера измерения массива
802 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
803 * ( aref -- int )
804 */
805
806 static void
807 jvm_generate_array_len(gen_proc_t * p, int dim)
808 {
809 while(dim > 0)
810 {
811 jvm_generate(p, 0, 1, "iconst_0");
812 jvm_generate(p, 2, 1, "aaload");
813 dim -= 1;
814 }
815 jvm_generate(p, 1, 1, "arraylength");
816 }
817
818 static void
819 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
820 {
821 jvm_generate_ldst_prepare(p, v);
822
823 int dim = 0;
824 oberon_type_t * base = arr;
825 while(base -> class == OBERON_TYPE_ARRAY)
826 {
827 if(base -> size == 0)
828 {
829 jvm_generate_load(p, v);
830 jvm_generate_array_len(p, dim);
831 dim += 1;
832 }
833 base = base -> base;
834 }
835
836 jvm_generate_new(p, arr, dim);
837 jvm_generate(p, 1, 2, "dup");
838 jvm_generate_load(p, v);
839 jvm_generate_copy_array(p, arr);
840 jvm_generate_store(p, v);
841 }
842
843 static void
844 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
845 {
846 jvm_generate_ldst_prepare(p, v);
847 jvm_generate_new(p, rec, 0);
848 jvm_generate(p, 1, 2, "dup");
849 jvm_generate_load(p, v);
850 jvm_generate_copy_record(p, rec);
851 jvm_generate_store(p, v);
852 }
853
854 static void
855 jvm_generate_local_object(gen_proc_t * p, oberon_object_t * x)
856 {
857 gen_var_t * v;
858 struct gen_class * class;
859
860 v = x -> gen_var;
861 class = p -> class;
862
863 // Убеждаемся что сейчас находимся в функции
864 assert(class -> p);
865 assert(x -> local);
866
867 switch(x -> class)
868 {
869 case OBERON_CLASS_VAR_PARAM:
870 case OBERON_CLASS_PARAM:
871 case OBERON_CLASS_VAR:
872 jvm_generate_var(v);
873 break;
874 case OBERON_CLASS_PROC:
875 break;
876 default:
877 gen_error("jvm_generate_local_initialization: wat");
878 break;
879 }
880 }
881
882 static void
883 jvm_generate_local_initialization(gen_proc_t * p, oberon_object_t * x)
884 {
885 gen_var_t * v;
886 struct gen_class * class;
887
888 v = x -> gen_var;
889 class = p -> class;
890
891 // Убеждаемся что сейчас находимся в функции
892 assert(class -> p);
893 assert(x -> local);
894
895 switch(x -> class)
896 {
897 case OBERON_CLASS_VAR_PARAM:
898 case OBERON_CLASS_PARAM:
899 case OBERON_CLASS_VAR:
900 jvm_generate_var_initialization(p, v);
901 break;
902 case OBERON_CLASS_PROC:
903 break;
904 default:
905 gen_error("jvm_generate_local_initialization: wat");
906 break;
907 }
908
909 if(x -> class == OBERON_CLASS_PARAM)
910 {
911 if(x -> type -> class == OBERON_TYPE_ARRAY)
912 {
913 jvm_generate_array_duplicate_and_replace(p, v, x -> type);
914 }
915 else if(x -> type -> class == OBERON_TYPE_RECORD)
916 {
917 jvm_generate_record_duplicate_and_replace(p, v, x -> type);
918 }
919 }
920 }
921
922 void
923 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
924 {
925 gen_proc_t * p;
926 char * name;
927 char * signature;
928 oberon_object_t * var;
929
930 p = proc -> gen_proc;
931
932 if(proc -> local)
933 {
934 signature = jvm_get_local_procedure_signature(proc);
935 }
936 else
937 {
938 oberon_generate_procedure_pointer_class(p -> class -> dir, proc);
939 signature = jvm_get_procedure_signature(proc -> type);
940 }
941
942 name = jvm_get_name(proc);
943 jvm_generate_function_header(p, "public static", name, signature);
944
945 if(proc -> local)
946 {
947 jvm_generate_staticlinks(proc);
948 }
949
950 jvm_generate_procedure_frame(proc);
951
952 /* Создание параметров и переменных */
953 var = proc -> scope -> list -> next;
954 while(var)
955 {
956 jvm_generate_local_object(p, var);
957 var = var -> next;
958 }
959
960 jvm_generate_frame_initialization(p);
961
962 /* Инициализация парамеров и переменных */
963 var = proc -> scope -> list -> next;
964 while(var)
965 {
966 jvm_generate_local_initialization(p, var);
967 var = var -> next;
968 }
969 }
970
971 void
972 oberon_generate_end_proc(oberon_context_t * ctx)
973 {
974 gen_module_t * m;
975 gen_proc_t * p;
976
977 m = ctx -> mod -> gen_mod;
978 p = m -> class -> p;
979
980 jvm_generate_function_end(p);
981 }
982
983 gen_label_t *
984 oberon_generator_reserve_label(oberon_context_t * ctx)
985 {
986 gen_module_t * m;
987 gen_proc_t * p;
988 gen_label_t * l;
989
990 m = ctx -> mod -> gen_mod;
991 p = m -> class -> p;
992
993 l = GC_MALLOC(sizeof *l);
994 memset(l, 0, sizeof *l);
995
996 l -> id = jvm_new_label_id(p);
997 return l;
998 }
999
1000 void
1001 oberon_generate_label(oberon_context_t * ctx, gen_label_t * l)
1002 {
1003 gen_module_t * m;
1004 gen_proc_t * p;
1005
1006 m = ctx -> mod -> gen_mod;
1007 p = m -> class -> p;
1008
1009 jvm_generate_label(p, l -> id);
1010 }
1011
1012 void
1013 oberon_generate_goto(oberon_context_t * ctx, gen_label_t * l)
1014 {
1015 gen_module_t * m;
1016 gen_proc_t * p;
1017
1018 m = ctx -> mod -> gen_mod;
1019 p = m -> class -> p;
1020
1021 jvm_generate(p, 0, 0, "goto L%i", l -> id);
1022 }
1023
1024 void
1025 oberon_generate_branch(oberon_context_t * ctx, oberon_expr_t * cond, bool gotoif, gen_label_t * l)
1026 {
1027 gen_module_t * m;
1028 gen_proc_t * p;
1029
1030 m = ctx -> mod -> gen_mod;
1031 p = m -> class -> p;
1032
1033 push_expr(p, cond);
1034
1035 if(gotoif == false)
1036 {
1037 /* переход если false */
1038 jvm_generate(p, 1, 0, "ifeq L%i", l -> id);
1039 }
1040 else
1041 {
1042 /* переход если true */
1043 jvm_generate(p, 1, 0, "ifne L%i", l -> id);
1044 }
1045 }
1046
1047 static void
1048 push_varptr(gen_proc_t * p, oberon_expr_t * expr)
1049 {
1050 assert(expr -> is_item);
1051
1052 switch(expr -> item.mode)
1053 {
1054 case MODE_VAR:
1055 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1056 break;
1057 case MODE_INDEX:
1058 push_item(p, expr -> item.parent);
1059 push_expr(p, expr -> item.args);
1060 break;
1061 case MODE_FIELD:
1062 push_item(p, expr -> item.parent);
1063 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1064 break;
1065 case MODE_DEREF:
1066 push_varptr(p, (oberon_expr_t *) expr -> item.parent);
1067 break;
1068 default:
1069 gen_error("push_varptr: wat %i", expr -> item.mode);
1070 break;
1071 }
1072 }
1073
1074 static void
1075 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1076 {
1077 assert(desig -> var == NULL);
1078 assert(desig -> mode == MODE_CALL);
1079
1080 bool direct_call = false;
1081 if(desig -> parent -> mode == MODE_VAR)
1082 {
1083 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1084 {
1085 direct_call = true;
1086 }
1087 }
1088
1089 oberon_type_t * procsig;
1090 procsig = desig -> parent -> result;
1091
1092 if(direct_call == false)
1093 {
1094 /* Загружаем указатель на процедуру */
1095 push_item(p, desig -> parent);
1096 }
1097
1098 if(direct_call)
1099 {
1100 jvm_generate_push_static_links(p, desig -> parent -> var);
1101 }
1102
1103 int args_cells = 0;
1104 int result_cells = jvm_cell_size_for_type(procsig -> base);
1105
1106 int num = desig -> num_args;
1107 oberon_expr_t * arg = desig -> args;
1108 oberon_object_t * param = procsig -> decl;
1109 for(int i = 0; i < num; i++)
1110 {
1111 if(param -> class == OBERON_CLASS_VAR_PARAM)
1112 {
1113 args_cells += 2;
1114 push_varptr(p, arg);
1115 }
1116 else
1117 {
1118 args_cells += jvm_cell_size_for_type(arg -> result);
1119 push_expr(p, arg);
1120 }
1121 arg = arg -> next;
1122 param = param -> next;
1123 }
1124
1125 if(direct_call)
1126 {
1127 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1128 char * signature = jvm_get_local_procedure_signature(desig -> parent -> var);
1129 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1130 }
1131 else
1132 {
1133 char * cname = jvm_get_class_full_name(procsig);
1134 char * signature = jvm_get_procedure_signature(procsig);
1135 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1136 }
1137 }
1138
1139 void
1140 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1141 {
1142 assert(desig -> is_item);
1143 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1144 }
1145
1146 void
1147 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1148 {
1149 gen_module_t * m;
1150 gen_proc_t * p;
1151 char prefix;
1152 int cell_size;
1153
1154 m = ctx -> mod -> gen_mod;
1155 p = m -> class -> p;
1156
1157 if(expr)
1158 {
1159 push_expr(p, expr);
1160 prefix = jvm_get_prefix(expr -> result);
1161 cell_size = jvm_cell_size_for_type(expr -> result);
1162 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1163 }
1164 else
1165 {
1166 jvm_generate(p, 0, 0, "return");
1167 }
1168 }
1169
1170 static void
1171 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1172 {
1173 assert(type -> class == OBERON_TYPE_POINTER);
1174
1175 for(int i = 0; i < num; i++)
1176 {
1177 push_expr(p, arg);
1178 arg = arg -> next;
1179 }
1180
1181 jvm_generate_new(p, type -> base, num);
1182 }
1183
1184 static void
1185 jvm_generate_cast_prefix(gen_proc_t * p, char prefix, char postfix)
1186 {
1187 if(prefix == postfix)
1188 {
1189 return;
1190 }
1191
1192 int from_cell_size = jvm_cell_size_for_postfix(prefix);
1193 int to_cell_size = jvm_cell_size_for_postfix(postfix);
1194 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1195 }
1196
1197 static void
1198 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1199 {
1200 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1201 {
1202 if(to -> class == OBERON_TYPE_POINTER && to -> base -> class == OBERON_TYPE_RECORD)
1203 {
1204 char * full_name = jvm_get_class_full_name(to);
1205 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1206 }
1207 }
1208 else
1209 {
1210 char prefix = jvm_get_prefix(from);
1211 char postfix = jvm_get_postfix(to);
1212 jvm_generate_cast_prefix(p, prefix, postfix);
1213 }
1214 }
1215
1216 static void
1217 jvm_generate_hard_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1218 {
1219 if(from -> class == OBERON_TYPE_REAL
1220 && (to -> class == OBERON_TYPE_INTEGER || to -> class == OBERON_TYPE_SYSTEM_BYTE))
1221 {
1222 char postfix = jvm_get_postfix(to);
1223 if(from -> size <= 4)
1224 {
1225 jvm_generate(p, 1, 1, "invokestatic java/lang/Float/floatToIntBits(F)I");
1226 jvm_generate_cast_prefix(p, 'i', postfix);
1227 }
1228 else
1229 {
1230 jvm_generate(p, 2, 2, "invokestatic java/lang/Double/doubleToIntBits(D)J");
1231 jvm_generate_cast_prefix(p, 'l', postfix);
1232 }
1233 }
1234 else if((from -> class == OBERON_TYPE_INTEGER || from -> class == OBERON_TYPE_SYSTEM_BYTE)
1235 && to -> class == OBERON_TYPE_REAL)
1236 {
1237 char prefix = jvm_get_prefix(from);
1238 if(to -> size <= 4)
1239 {
1240 jvm_generate_cast_prefix(p, prefix, 'i');
1241 jvm_generate(p, 1, 1, "invokestatic java/lang/Float/intBitsToFloat(I)F");
1242 }
1243 else
1244 {
1245 jvm_generate_cast_prefix(p, prefix, 'l');
1246 jvm_generate(p, 2, 2, "invokestatic java/lang/Double/longBitsToDouble(J)D");
1247 }
1248 }
1249 else
1250 {
1251 jvm_generate_cast_type(p, from, to);
1252 }
1253 }
1254
1255 static void
1256 push_item(gen_proc_t * p, oberon_item_t * item)
1257 {
1258 switch(item -> mode)
1259 {
1260 case MODE_VAR:
1261 if(item -> var -> class == OBERON_CLASS_PROC)
1262 {
1263 jvm_generate_push_procedure_pointer(p, item -> var);
1264 }
1265 else
1266 {
1267 jvm_generate_load(p, item -> var -> gen_var);
1268 }
1269 break;
1270 case MODE_INTEGER:
1271 case MODE_BOOLEAN:
1272 case MODE_CHAR:
1273 case MODE_SET:
1274 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1275 break;
1276 case MODE_CALL:
1277 jvm_generate_call_proc(p, item);
1278 break;
1279 case MODE_INDEX:
1280 ;
1281 char postfix = jvm_get_postfix(item -> result);
1282 int cell_size = jvm_cell_size_for_postfix(postfix);
1283 push_item(p, item -> parent);
1284 push_expr(p, item -> args);
1285 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1286 break;
1287 case MODE_FIELD:
1288 push_item(p, item -> parent);
1289 jvm_generate_load(p, item -> var -> gen_var);
1290 break;
1291 case MODE_DEREF:
1292 /* Все объекты в jvm представляются как указатели */
1293 push_item(p, item -> parent);
1294 break;
1295 case MODE_NIL:
1296 jvm_generate(p, 0, 1, "aconst_null");
1297 break;
1298 case MODE_NEW:
1299 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1300 break;
1301 case MODE_REAL:
1302 jvm_generate_push_float(p, item -> real, item -> result -> size);
1303 break;
1304 case MODE_STRING:
1305 jvm_generate_push_string(p, item -> string, item -> result -> size);
1306 break;
1307 case MODE_LEN:
1308 push_item(p, item -> parent);
1309 jvm_generate_array_len(p, item -> integer);
1310 jvm_generate_cast_prefix(p, 'i', jvm_get_postfix(item -> result));
1311 break;
1312 default:
1313 gen_error("push_item: unk mode %i", item -> mode);
1314 break;
1315 }
1316 }
1317
1318 static void
1319 jvm_generate_logical_not(gen_proc_t * p)
1320 {
1321 int label_done = jvm_new_label_id(p);
1322 int label_false = jvm_new_label_id(p);
1323
1324 jvm_generate(p, 1, 0, "ifne L%i", label_false);
1325 jvm_generate(p, 0, 1, "iconst_1");
1326 jvm_generate(p, 0, 0, "goto L%i", label_done);
1327 jvm_generate_label(p, label_false);
1328 jvm_generate(p, 0, 1, "iconst_0");
1329 jvm_generate_label(p, label_done);
1330 }
1331
1332 static void
1333 jvm_generate_abs(gen_proc_t * p, char prefix)
1334 {
1335 char t = jvm_get_type_of_prefix(prefix);
1336 int cell_size = jvm_cell_size_for_postfix(prefix);
1337 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1338 }
1339
1340 static char *
1341 jvm_get_compare_postfix(int op)
1342 {
1343 char * cmpop = "";
1344 switch(op)
1345 {
1346 case OP_EQ:
1347 cmpop = "eq";
1348 break;
1349 case OP_NEQ:
1350 cmpop = "ne";
1351 break;
1352 case OP_LSS:
1353 cmpop = "lt";
1354 break;
1355 case OP_LEQ:
1356 cmpop = "le";
1357 break;
1358 case OP_GRT:
1359 cmpop = "gt";
1360 break;
1361 case OP_GEQ:
1362 cmpop = "ge";
1363 break;
1364 default:
1365 gen_error("jvm_generate_compare_op: wat");
1366 break;
1367 }
1368 return cmpop;
1369 }
1370
1371 static void
1372 jvm_generate_compare_op(gen_proc_t * p, oberon_type_t * t, int op)
1373 {
1374 char prefix = jvm_get_prefix(t);
1375 int label_true = jvm_new_label_id(p);
1376 int label_done = jvm_new_label_id(p);
1377 int cell_size = jvm_cell_size_for_type(t);
1378 char * cmpop = jvm_get_compare_postfix(op);
1379
1380 if(prefix == 'l')
1381 {
1382 jvm_generate(p, 2 * cell_size, 1, "lcmp");
1383 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1384 }
1385 else if(prefix == 'f' || prefix == 'd')
1386 {
1387 char fop;
1388 if(op == OP_EQ || op == OP_NEQ || op == OP_GRT || op == OP_GEQ)
1389 {
1390 fop = 'l';
1391 }
1392 else
1393 {
1394 fop = 'g';
1395 }
1396 jvm_generate(p, 2 * cell_size, 1, "%ccmp%c", prefix, fop);
1397 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1398 }
1399 else if(prefix == 'a')
1400 {
1401 if(t -> class == OBERON_TYPE_STRING
1402 || (t -> class == OBERON_TYPE_POINTER && t -> base -> class == OBERON_TYPE_CHAR))
1403 {
1404 jvm_generate(p, 2, 1, "invokestatic SYSTEM/STRCMP([B[B)I");
1405 jvm_generate(p, 1, 0, "if%s L%i", cmpop, label_true);
1406 }
1407 else
1408 {
1409 jvm_generate(p, 1, 0, "if_acmp%s L%i", cmpop, label_true);
1410 }
1411 }
1412 else
1413 {
1414 jvm_generate(p, 2 * cell_size, 0, "if_%ccmp%s L%i", prefix, cmpop, label_true);
1415 }
1416
1417 jvm_generate(p, 0, 1, "iconst_0");
1418 jvm_generate(p, 0, 0, "goto L%i", label_done);
1419 jvm_generate_label(p, label_true);
1420 jvm_generate(p, 0, 1, "iconst_1");
1421 jvm_generate_label(p, label_done);
1422 }
1423
1424 static void
1425 jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
1426 {
1427 char prefix = jvm_get_prefix(t);
1428 int cell_size = jvm_cell_size_for_type(t);
1429 switch(op)
1430 {
1431 case OP_UNARY_MINUS:
1432 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1433 break;
1434 case OP_COMPLEMENTATION:
1435 jvm_generate_push_int_size(p, -1, t -> size);
1436 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1437 break;
1438 case OP_LOGIC_NOT:
1439 jvm_generate_logical_not(p);
1440 break;
1441 case OP_ABS:
1442 jvm_generate_abs(p, prefix);
1443 break;
1444 case OP_CAP:
1445 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Character/toUpperCase(I)I");
1446 break;
1447
1448 case OP_ADD:
1449 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1450 break;
1451 case OP_SUB:
1452 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1453 break;
1454 case OP_MUL:
1455 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1456 break;
1457 case OP_DIV:
1458 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1459 break;
1460 case OP_MOD:
1461 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1462 break;
1463 case OP_UNION:
1464 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1465 break;
1466 case OP_INTERSECTION:
1467 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1468 break;
1469 case OP_DIFFERENCE:
1470 /* (a - b) == a & ~b */
1471 jvm_generate_push_int_size(p, -1, t -> size);
1472 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1473 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1474 break;
1475 case OP_SYM_DIFFERENCE:
1476 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1477 break;
1478
1479 case OP_EQ:
1480 case OP_NEQ:
1481 case OP_LSS:
1482 case OP_LEQ:
1483 case OP_GRT:
1484 case OP_GEQ:
1485 jvm_generate_compare_op(p, t, op);
1486 break;
1487 default:
1488 gen_error("jvm_generate_operator: unk op %i", op);
1489 break;
1490 }
1491 }
1492
1493 static void
1494 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1495 {
1496 int label_calc_b = jvm_new_label_id(p);
1497 int label_done = jvm_new_label_id(p);
1498
1499 /* a OR b -- если a, то TRUE, иначе b */
1500
1501 push_expr(p, a);
1502 jvm_generate(p, 1, 0, "ifeq L%i", label_calc_b);
1503 jvm_generate(p, 0, 1, "iconst_1");
1504 jvm_generate(p, 0, 0, "goto L%i", label_done);
1505 jvm_generate_label(p, label_calc_b);
1506 push_expr(p, b);
1507 jvm_generate_label(p, label_done);
1508 }
1509
1510 static void
1511 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1512 {
1513 int label_false = jvm_new_label_id(p);
1514 int label_done = jvm_new_label_id(p);
1515
1516 /* a AND b -- если a, то b, иначе FALSE */
1517
1518 push_expr(p, a);
1519 jvm_generate(p, 1, 0, "ifeq L%i", label_false);
1520 push_expr(p, b);
1521 jvm_generate(p, 0, 0, "goto L%i", label_done);
1522 jvm_generate_label(p, label_false);
1523 jvm_generate(p, 0, 1, "iconst_0");
1524 jvm_generate_label(p, label_done);
1525 }
1526
1527 static void
1528 jvm_generate_range(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1529 {
1530 /* { a } == 1 << a */
1531 /* { a..b } == (a <= b) ? ((2 << b) - (1 << a)) : (0); */
1532
1533 char prefix;
1534 int cell_size;
1535 oberon_type_t * type;
1536 gen_var_t * ra;
1537 gen_var_t * rb;
1538 int label_else;
1539 int label_end;
1540
1541 type = a -> result;
1542 cell_size = jvm_cell_size_for_type(type);
1543 prefix = jvm_get_prefix(type);
1544
1545 if(b == NULL)
1546 {
1547 jvm_generate_push_int_size(p, 1, type -> size);
1548 push_expr(p, a);
1549 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1550 }
1551 else
1552 {
1553 ra = jvm_create_function_temp_var(p, type -> gen_type);
1554 rb = jvm_create_function_temp_var(p, type -> gen_type);
1555 jvm_generate_var(ra);
1556 jvm_generate_var(rb);
1557 jvm_generate_var_initialization(p, ra);
1558 jvm_generate_var_initialization(p, rb);
1559 label_else = jvm_new_label_id(p);
1560 label_end = jvm_new_label_id(p);
1561
1562 push_expr(p, a);
1563 jvm_generate_store(p, ra);
1564 push_expr(p, b);
1565 jvm_generate_store(p, rb);
1566
1567 jvm_generate_load(p, ra);
1568 jvm_generate_load(p, rb);
1569 jvm_generate(p, 2 * cell_size, 0, "if_%ccmpgt L%i", prefix, label_else);
1570
1571 jvm_generate_push_int_size(p, 2, type -> size);
1572 jvm_generate_load(p, rb);
1573 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1574 jvm_generate_push_int_size(p, 2, type -> size);
1575 jvm_generate_load(p, ra);
1576 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1577 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1578 jvm_generate(p, 0, 0, "goto L%i", label_end);
1579
1580 jvm_generate_label(p, label_else);
1581 jvm_generate_push_int_size(p, 0, type -> size);
1582 jvm_generate_label(p, label_end);
1583 }
1584
1585 /* TODO free registers */
1586 }
1587
1588 static void
1589 jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1590 {
1591 oberon_type_t * t = a -> result;
1592 int cell_size = jvm_cell_size_for_type(t);
1593 char prefix = jvm_get_prefix(t);
1594 int label_else = jvm_new_label_id(p);
1595 int label_end = jvm_new_label_id(p);
1596
1597 /* (a IN b) == (1 << a) & b */
1598 jvm_generate_push_int_size(p, 1, t -> size);
1599 push_expr(p, a);
1600 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1601 push_expr(p, b);
1602 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1603
1604 if(cell_size > 1)
1605 {
1606 jvm_generate(p, cell_size, 0, "lcmp");
1607 }
1608
1609 jvm_generate(p, 1, 0, "ifeq L%i", label_else);
1610 jvm_generate(p, 0, 1, "iconst_1");
1611 jvm_generate(p, 0, 0, "goto L%i", label_end);
1612 jvm_generate_label(p, label_else);
1613 jvm_generate(p, 0, 1, "iconst_0");
1614 jvm_generate_label(p, label_end);
1615 }
1616
1617 static void
1618 jvm_generate_shift(gen_proc_t * p, int op, oberon_expr_t * a, oberon_expr_t * b)
1619 {
1620 oberon_type_t * t = a -> result;
1621 int cell_size = jvm_cell_size_for_type(t);
1622 char prefix = jvm_get_prefix(t);
1623 char dt = jvm_get_type_of_prefix(prefix);
1624
1625 push_expr(p, a);
1626 jvm_generate_cast_type(p, a -> result, t);
1627 push_expr(p, b);
1628 jvm_generate_cast_type(p, b -> result, t);
1629
1630 char * opname;
1631 switch(op)
1632 {
1633 case OP_ASH:
1634 opname = "ASH";
1635 break;
1636 case OP_LSH:
1637 opname = "LSH";
1638 break;
1639 case OP_ROT:
1640 opname = "ROT";
1641 break;
1642 default:
1643 gen_error("jvm_generate_shift: invalid op %i", op);
1644 }
1645
1646 jvm_generate(p, 2 * cell_size, cell_size, "invokestatic SYSTEM/%s(%c%c)%c", opname, dt, dt, dt);
1647 }
1648
1649 static void
1650 jvm_generate_entier(gen_proc_t * p, oberon_expr_t * x, oberon_type_t * res)
1651 {
1652 char prefix = jvm_get_prefix(x -> result);
1653 char postfix = jvm_get_postfix(res);
1654
1655 push_expr(p, x);
1656 jvm_generate_cast_prefix(p, prefix, 'd');
1657 jvm_generate(p, 2, 2, "invokestatic java/lang/Math/floor(D)D");
1658 jvm_generate_cast_prefix(p, 'd', postfix);
1659 }
1660
1661 static void
1662 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1663 {
1664 oberon_type_t * preq = oper -> left -> result;
1665 int op = oper -> op;
1666 switch(op)
1667 {
1668 case OP_CAST:
1669 push_expr(p, oper -> left);
1670 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1671 break;
1672 case OP_HARDCAST:
1673 push_expr(p, oper -> left);
1674 jvm_generate_hard_cast_type(p, oper -> left -> result, oper -> result);
1675 break;
1676 case OP_COMPLEMENTATION:
1677 case OP_UNARY_MINUS:
1678 case OP_LOGIC_NOT:
1679 case OP_ABS:
1680 case OP_CAP:
1681 push_expr(p, oper -> left);
1682 jvm_generate_operator(p, preq, op);
1683 break;
1684 case OP_ENTIER:
1685 jvm_generate_entier(p, oper -> left, oper -> result);
1686 break;
1687
1688 case OP_ADD:
1689 case OP_SUB:
1690 case OP_MUL:
1691 case OP_DIV:
1692 case OP_MOD:
1693
1694 case OP_UNION:
1695 case OP_INTERSECTION:
1696 case OP_DIFFERENCE:
1697 case OP_SYM_DIFFERENCE:
1698
1699 case OP_EQ:
1700 case OP_NEQ:
1701 case OP_LSS:
1702 case OP_LEQ:
1703 case OP_GRT:
1704 case OP_GEQ:
1705 push_expr(p, oper -> left);
1706 push_expr(p, oper -> right);
1707 jvm_generate_operator(p, preq, op);
1708 break;
1709
1710 case OP_LOGIC_OR:
1711 jvm_generate_logical_or(p, oper -> left, oper -> right);
1712 break;
1713 case OP_LOGIC_AND:
1714 jvm_generate_logical_and(p, oper -> left, oper -> right);
1715 break;
1716
1717 case OP_IS:
1718 preq = oper -> right -> result;
1719 char * cname = jvm_get_class_full_name(preq);
1720 push_expr(p, oper -> left);
1721 jvm_generate(p, 1, 1, "instanceof %s", cname);
1722 break;
1723 case OP_RANGE:
1724 jvm_generate_range(p, oper -> left, oper -> right);
1725 break;
1726 case OP_IN:
1727 jvm_generate_in(p, oper -> left, oper -> right);
1728 break;
1729
1730 case OP_ASH:
1731 case OP_LSH:
1732 case OP_ROT:
1733 jvm_generate_shift(p, op, oper -> left, oper -> right);
1734 break;
1735 default:
1736 gen_error("push_oper: unk op %i", op);
1737 break;
1738 }
1739 }
1740
1741 static void
1742 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1743 {
1744 if(expr -> is_item)
1745 {
1746 push_item(p, (oberon_item_t *) expr);
1747 }
1748 else
1749 {
1750 push_operator(p, (oberon_oper_t *) expr);
1751 }
1752 }
1753
1754 static void
1755 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1756 {
1757 assert(dst -> is_item);
1758 oberon_item_t * item = (oberon_item_t *) dst;
1759
1760 if(dst -> result -> class == OBERON_TYPE_ARRAY
1761 || src -> result -> class == OBERON_TYPE_ARRAY)
1762 {
1763 push_expr(p, dst);
1764 push_expr(p, src);
1765 jvm_generate_copy_array(p, dst -> result);
1766 }
1767 else if(dst -> result -> class == OBERON_TYPE_RECORD
1768 || src -> result -> class == OBERON_TYPE_RECORD)
1769 {
1770 push_expr(p, dst);
1771 push_expr(p, src);
1772 jvm_generate_copy_record(p, dst -> result);
1773 }
1774 else switch(item -> mode)
1775 {
1776 case MODE_VAR:
1777 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1778 push_expr(p, src);
1779 jvm_generate_store(p, item -> var -> gen_var);
1780 break;
1781 case MODE_INDEX:
1782 ;
1783 char postfix = jvm_get_postfix(src -> result);
1784 int cell_size = jvm_cell_size_for_postfix(postfix);
1785 assert(item -> parent -> is_item);
1786 push_item(p, (oberon_item_t *) item -> parent);
1787 push_expr(p, item -> args);
1788 push_expr(p, src);
1789 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1790 break;
1791 case MODE_FIELD:
1792 assert(item -> parent -> is_item);
1793 push_item(p, (oberon_item_t *) item -> parent);
1794 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1795 push_expr(p, src);
1796 jvm_generate_store(p, item -> var -> gen_var);
1797 break;
1798 default:
1799 gen_error("store_expr: unk mode %i", item -> mode);
1800 break;
1801 }
1802 }
1803
1804 void
1805 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
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 store_expr(p, dst, src);
1814 }
1815
1816 void
1817 oberon_generate_copy(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1818 {
1819 gen_module_t * m;
1820 gen_proc_t * p;
1821 char * desc;
1822
1823 m = ctx -> mod -> gen_mod;
1824 p = m -> class -> p;
1825
1826 push_expr(p, src);
1827 push_expr(p, dst);
1828
1829 desc = jvm_get_descriptor(dst -> result);
1830
1831 jvm_generate(p, 2, 0, "invokestatic SYSTEM/COPY(%s%s)V", desc, desc);
1832 }
1833
1834 void
1835 oberon_generate_assert(oberon_context_t * ctx, oberon_expr_t * cond)
1836 {
1837 gen_module_t * m;
1838 gen_proc_t * p;
1839
1840 m = ctx -> mod -> gen_mod;
1841 p = m -> class -> p;
1842
1843 push_expr(p, cond);
1844 jvm_generate(p, 1, 0, "invokestatic SYSTEM/ASSERT(Z)V");
1845 }
1846
1847 void
1848 oberon_generate_assert_n(oberon_context_t * ctx, oberon_expr_t * cond, int64_t n)
1849 {
1850 gen_module_t * m;
1851 gen_proc_t * p;
1852
1853 m = ctx -> mod -> gen_mod;
1854 p = m -> class -> p;
1855
1856 push_expr(p, cond);
1857 jvm_generate_push_int_size(p, n, 8);
1858 jvm_generate(p, 1 + 2, 0, "invokestatic SYSTEM/ASSERT(ZJ)V");
1859 }
1860
1861 void
1862 oberon_generate_trap(oberon_context_t * ctx, int64_t n)
1863 {
1864 gen_module_t * m;
1865 gen_proc_t * p;
1866
1867 m = ctx -> mod -> gen_mod;
1868 p = m -> class -> p;
1869
1870 jvm_generate_push_int_size(p, n, 8);
1871 jvm_generate(p, 2, 0, "invokestatic SYSTEM/TRAP(J)V");
1872 }
1873
1874 void
1875 oberon_generate_halt(oberon_context_t * ctx, int64_t n)
1876 {
1877 gen_module_t * m;
1878 gen_proc_t * p;
1879
1880 m = ctx -> mod -> gen_mod;
1881 p = m -> class -> p;
1882
1883 jvm_generate_push_int_size(p, n, 8);
1884 jvm_generate(p, 2, 0, "invokestatic SYSTEM/HALT(J)V");
1885 }
1886
1887 void
1888 oberon_set_out_directory(oberon_context_t * ctx, const char * path)
1889 {
1890 gen_context_t * c;
1891
1892 c = ctx -> gen_context;
1893
1894 c -> dir = new_string(path);
1895 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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