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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 }
323
324 void
325 oberon_generator_destroy_context(oberon_context_t * ctx)
326 {
327 }
328
329 static void
330 oberon_generate_procedure_class(oberon_type_t * proc)
331 {
332 FILE * fp;
333 char * cname;
334 char * signature;
335 struct gen_class * class;
336
337 cname = jvm_get_class_full_name(proc);
338 class = jvm_create_class(cname);
339 fp = class -> fp;
340
341 fprintf(fp, ".source SYSTEM\n");
342 fprintf(fp, ".class public abstract %s\n", cname);
343 fprintf(fp, ".super java/lang/Object\n\n");
344
345 fprintf(fp, ".method <init>()V\n");
346 fprintf(fp, " aload_0\n");
347 fprintf(fp, " invokespecial java/lang/Object/<init>()V\n");
348 fprintf(fp, " return\n");
349 fprintf(fp, ".end method\n\n");
350
351 signature = jvm_get_procedure_signature(proc);
352
353 fprintf(fp, ".method public abstract invoke%s\n", signature);
354 fprintf(fp, ".end method\n\n");
355
356 jvm_destroy_class(class);
357 }
358
359 static void
360 oberon_generate_procedure_pointer_class(oberon_object_t * proc)
361 {
362 FILE * fp;
363 char * cname;
364 char * abscname;
365 char * absdesc;
366 char * signature;
367 struct gen_class * class;
368
369 cname = jvm_get_field_full_name_safe(proc);
370 class = jvm_create_class(cname);
371 abscname = jvm_get_class_full_name(proc -> type);
372 absdesc = jvm_get_descriptor(proc -> type);
373 fp = class -> fp;
374
375 fprintf(fp, ".source %s\n", proc -> module -> name);
376 fprintf(fp, ".class public %s\n", cname);
377 fprintf(fp, ".super %s\n\n", abscname);
378
379 fprintf(fp, ".field public static pointer %s\n\n", absdesc);
380
381 fprintf(fp, ".method 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(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(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 if(type -> class != OBERON_TYPE_NOTYPE)
479 {
480 t -> wide = jvm_is_wide_type(type);
481 t -> prefix = jvm_get_prefix(type);
482 t -> postfix = jvm_get_postfix(type);
483 }
484
485 t -> cell_size = jvm_cell_size_for_type(type);
486
487 if(type -> class != OBERON_TYPE_NIL)
488 {
489 t -> desc = jvm_get_descriptor(type);
490 }
491
492 switch(type -> class)
493 {
494 case OBERON_TYPE_NOTYPE:
495 case OBERON_TYPE_INTEGER:
496 case OBERON_TYPE_BOOLEAN:
497 case OBERON_TYPE_ARRAY:
498 case OBERON_TYPE_POINTER:
499 case OBERON_TYPE_REAL:
500 case OBERON_TYPE_CHAR:
501 case OBERON_TYPE_STRING:
502 case OBERON_TYPE_SET:
503 case OBERON_TYPE_NIL:
504 break;
505 case OBERON_TYPE_RECORD:
506 ;
507 gen_module_t * m;
508 m = type -> module -> gen_mod;
509 oberon_generate_record_class(m, type);
510 break;
511 case OBERON_TYPE_PROCEDURE:
512 oberon_generate_procedure_class(type);
513 break;
514 default:
515 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
516 break;
517 }
518 }
519
520 void
521 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
522 {
523 struct gen_class * class;
524 class = rec -> gen_type -> class;
525
526 int num = rec -> num_decl;
527 oberon_object_t * field = rec -> decl;
528 for(int i = 0; i < num; i++)
529 {
530 jvm_generate_var(field -> gen_var);
531 field = field -> next;
532 }
533
534 /* Стандартный конструктор класса */
535 /* Инициализирует внутренние статические записи и массивы */
536 gen_proc_t * p = jvm_create_proc(class);
537 jvm_generate_function_header(p, "public", "<init>", "()V");
538 jvm_alloc_register_untyped(p -> rf, false);
539 jvm_generate(p, 0, 1, "aload_0");
540 if(class -> base)
541 {
542 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
543 }
544 else
545 {
546 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
547 }
548 num = rec -> num_decl;
549 field = rec -> decl;
550 for(int i = 0; i < num; i++)
551 {
552 jvm_generate(p, 0, 1, "aload_0");
553 jvm_generate_var_initialization(p, field -> gen_var);
554
555 if(field -> type -> class == OBERON_TYPE_RECORD
556 || field -> type -> class == OBERON_TYPE_ARRAY)
557 {
558 jvm_generate(p, 0, 1, "aload_0");
559 jvm_generate_ldst_prepare(p, field -> gen_var);
560 jvm_generate_new(p, field -> type, 0);
561 jvm_generate_store(p, field -> gen_var);
562 }
563 field = field -> next;
564 }
565 jvm_generate(p, 0, 0, "return");
566 jvm_generate_function_end(p);
567
568 /* Метод для копирования полей класса */
569 /* reg0 == src -> reg1 == dst */
570 p = jvm_create_proc(class);
571 char * signature = new_string("(%s%s)V", rec -> gen_type -> desc, rec -> gen_type -> desc);
572 jvm_generate_function_header(p, "public static", "$COPY$", signature);
573
574 gen_var_t * copy_dst = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "dst", rec -> gen_type);
575 gen_var_t * copy_src = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "src", rec -> gen_type);
576 jvm_generate_var(copy_dst);
577 jvm_generate_var(copy_src);
578 jvm_generate_var_initialization(p, copy_dst);
579 jvm_generate_var_initialization(p, copy_src);
580
581 num = rec -> num_decl;
582 field = rec -> decl;
583 for(int i = 0; i < num; i++)
584 {
585 if(field -> type -> class == OBERON_TYPE_RECORD)
586 {
587 jvm_generate_load(p, copy_dst);
588 jvm_generate_load(p, field -> gen_var);
589 jvm_generate_load(p, copy_src);
590 jvm_generate_load(p, field -> gen_var);
591 jvm_generate_copy_record(p, field -> type);
592 }
593 else if(field -> type -> class == OBERON_TYPE_ARRAY)
594 {
595 jvm_generate_load(p, copy_dst);
596 jvm_generate_load(p, field -> gen_var);
597 jvm_generate_load(p, copy_src);
598 jvm_generate_load(p, field -> gen_var);
599 jvm_generate_copy_array(p, field -> type);
600 }
601 else
602 {
603 jvm_generate_load(p, copy_dst);
604 jvm_generate_ldst_prepare(p, field -> gen_var);
605 jvm_generate_load(p, copy_src);
606 jvm_generate_load(p, field -> gen_var);
607 jvm_generate_store(p, field -> gen_var);
608 }
609 field = field -> next;
610 }
611 jvm_generate(p, 0, 0, "return");
612 jvm_generate_function_end(p);
613
614 jvm_destroy_class(class);
615 }
616
617 void
618 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
619 {
620 gen_module_t * m;
621 m = ctx -> mod -> gen_mod;
622
623 struct gen_class * class;
624 class = m -> class;
625
626 gen_proc_t * p;
627 struct gen_class * c;
628 char * name = var -> name;
629 gen_type_t * t = var -> type -> gen_type;
630 switch(var -> class)
631 {
632 case OBERON_CLASS_VAR_PARAM:
633 p = var -> parent -> gen_proc;
634 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VARPTR, name, t);
635 break;
636 case OBERON_CLASS_PARAM:
637 p = var -> parent -> gen_proc;
638 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VAR, name, t);
639 break;
640 case OBERON_CLASS_FIELD:
641 c = var -> parent_type -> gen_type -> class;
642 var -> gen_var = jvm_create_class_var(c, JVM_STORAGE_FIELD_VAR, name, t);
643 break;
644 case OBERON_CLASS_VAR:
645 if(var -> local)
646 {
647 p = var -> parent -> gen_proc;
648 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_VAR, name, t);
649 }
650 else
651 {
652 var -> gen_var = jvm_create_class_var(class, JVM_STORAGE_STATIC_VAR, name, t);
653 jvm_generate_var(var -> gen_var);
654 }
655 break;
656 default:
657 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
658 break;
659 }
660 }
661
662 void
663 oberon_generator_init_temp_var(oberon_context_t * ctx, oberon_object_t * var)
664 {
665 assert(var -> class == OBERON_CLASS_VAR);
666
667 gen_module_t * m;
668 m = ctx -> mod -> gen_mod;
669
670 gen_proc_t * p;
671 p = m -> class -> p;
672
673 gen_type_t * t;
674 t = var -> type -> gen_type;
675
676 var -> gen_var = jvm_create_function_temp_var(p, t);
677 jvm_generate_var(var -> gen_var);
678 jvm_generate_var_initialization(p, var -> gen_var);
679 }
680
681 void
682 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
683 {
684 struct gen_class * class = proc -> module -> gen_mod -> class;
685 proc -> gen_proc = jvm_create_proc(class);
686 proc -> gen_proc -> full_name = jvm_get_field_full_name_safe(proc);
687 jvm_create_static_links(proc);
688 }
689
690 void
691 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
692 {
693 gen_module_t * m = GC_MALLOC(sizeof *m);
694 memset(m, 0, sizeof *m);
695 mod -> gen_mod = m;
696
697 struct gen_class * class;
698 class = jvm_create_class(mod -> name);
699
700 fprintf(class -> fp, ".source %s\n", mod -> name);
701 fprintf(class -> fp, ".class %s\n", mod -> name);
702 fprintf(class -> fp, ".super java/lang/Object\n\n");
703
704 m -> class = class;
705
706 ctx -> gen_context -> current_m = m;
707 }
708
709 void
710 oberon_generator_fini_module(oberon_module_t * mod)
711 {
712 jvm_destroy_class(mod -> gen_mod -> class);
713 }
714
715 static void
716 push_expr(gen_proc_t * p, oberon_expr_t * expr);
717
718 void
719 oberon_generate_begin_module(oberon_context_t * ctx)
720 {
721 struct gen_class * class = ctx -> mod -> gen_mod -> class;
722 gen_proc_t * p = jvm_create_proc(class);
723
724 jvm_generate_function_header(p, "public", "<init>", "()V");
725 jvm_alloc_register_untyped(p -> rf, false);
726 jvm_generate(p, 0, 1, "aload_0");
727 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
728
729 /* Инициализация переменных объявленных в модуле */
730 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
731 while(x != NULL)
732 {
733 if(x -> class == OBERON_CLASS_VAR)
734 {
735 jvm_generate_var_initialization(p, x -> gen_var);
736 if(x -> type -> class == OBERON_TYPE_ARRAY
737 || x -> type -> class == OBERON_TYPE_RECORD)
738 {
739 jvm_generate_ldst_prepare(p, x -> gen_var);
740 jvm_generate_new(p, x -> type, 0);
741 jvm_generate_store(p, x -> gen_var);
742 }
743 }
744
745 x = x -> next;
746 }
747 }
748
749 void
750 oberon_generate_end_module(oberon_context_t * ctx)
751 {
752 struct gen_class * class = ctx -> mod -> gen_mod -> class;
753 gen_proc_t * p = class -> p;
754
755 jvm_generate(p, 0, 0, "return");
756 jvm_generate_function_end(class -> p);
757 }
758
759 /*
760 * Генерирует код для получения размера измерения массива
761 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
762 * ( aref -- int )
763 */
764
765 static void
766 jvm_generate_array_len(gen_proc_t * p, int dim)
767 {
768 while(dim > 0)
769 {
770 jvm_generate(p, 0, 1, "iconst_0");
771 jvm_generate(p, 2, 1, "aaload");
772 dim -= 1;
773 }
774 jvm_generate(p, 1, 1, "arraylength");
775 }
776
777 static void
778 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
779 {
780 jvm_generate_ldst_prepare(p, v);
781
782 int dim = 0;
783 oberon_type_t * base = arr;
784 while(base -> class == OBERON_TYPE_ARRAY)
785 {
786 if(base -> size == 0)
787 {
788 jvm_generate_load(p, v);
789 jvm_generate_array_len(p, dim);
790 dim += 1;
791 }
792 base = base -> base;
793 }
794
795 jvm_generate_new(p, arr, dim);
796 jvm_generate(p, 1, 2, "dup");
797 jvm_generate_load(p, v);
798 jvm_generate_copy_array(p, arr);
799 jvm_generate_store(p, v);
800 }
801
802 static void
803 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
804 {
805 jvm_generate_ldst_prepare(p, v);
806 jvm_generate_new(p, rec, 0);
807 jvm_generate(p, 1, 2, "dup");
808 jvm_generate_load(p, v);
809 jvm_generate_copy_record(p, rec);
810 jvm_generate_store(p, v);
811 }
812
813 static void
814 jvm_generate_local_object(gen_proc_t * p, oberon_object_t * x)
815 {
816 gen_var_t * v;
817 struct gen_class * class;
818
819 v = x -> gen_var;
820 class = p -> class;
821
822 // Убеждаемся что сейчас находимся в функции
823 assert(class -> p);
824 assert(x -> local);
825
826 switch(x -> class)
827 {
828 case OBERON_CLASS_VAR_PARAM:
829 case OBERON_CLASS_PARAM:
830 case OBERON_CLASS_VAR:
831 jvm_generate_var(v);
832 break;
833 case OBERON_CLASS_PROC:
834 break;
835 default:
836 gen_error("jvm_generate_local_initialization: wat");
837 break;
838 }
839 }
840
841 static void
842 jvm_generate_local_initialization(gen_proc_t * p, oberon_object_t * x)
843 {
844 gen_var_t * v;
845 struct gen_class * class;
846
847 v = x -> gen_var;
848 class = p -> class;
849
850 // Убеждаемся что сейчас находимся в функции
851 assert(class -> p);
852 assert(x -> local);
853
854 switch(x -> class)
855 {
856 case OBERON_CLASS_VAR_PARAM:
857 case OBERON_CLASS_PARAM:
858 case OBERON_CLASS_VAR:
859 jvm_generate_var_initialization(p, v);
860 break;
861 case OBERON_CLASS_PROC:
862 break;
863 default:
864 gen_error("jvm_generate_local_initialization: wat");
865 break;
866 }
867
868 if(x -> class == OBERON_CLASS_PARAM)
869 {
870 if(x -> type -> class == OBERON_TYPE_ARRAY)
871 {
872 jvm_generate_array_duplicate_and_replace(p, v, x -> type);
873 }
874 else if(x -> type -> class == OBERON_TYPE_RECORD)
875 {
876 jvm_generate_record_duplicate_and_replace(p, v, x -> type);
877 }
878 }
879 }
880
881 void
882 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
883 {
884 gen_proc_t * p;
885 char * name;
886 char * signature;
887 oberon_object_t * var;
888
889 p = proc -> gen_proc;
890
891 if(proc -> local)
892 {
893 signature = jvm_get_local_procedure_signature(proc);
894 }
895 else
896 {
897 oberon_generate_procedure_pointer_class(proc);
898 signature = jvm_get_procedure_signature(proc -> type);
899 }
900
901 name = jvm_get_name(proc);
902 jvm_generate_function_header(p, "public static", name, signature);
903
904 if(proc -> local)
905 {
906 jvm_generate_staticlinks(proc);
907 }
908
909 jvm_generate_procedure_frame(proc);
910
911 /* Создание парамеров и переменных */
912 var = proc -> scope -> list -> next;
913 while(var)
914 {
915 jvm_generate_local_object(p, var);
916 var = var -> next;
917 }
918
919 jvm_generate_frame_initialization(p);
920
921 /* Инициализация парамеров и переменных */
922 var = proc -> scope -> list -> next;
923 while(var)
924 {
925 jvm_generate_local_initialization(p, var);
926 var = var -> next;
927 }
928 }
929
930 void
931 oberon_generate_end_proc(oberon_context_t * ctx)
932 {
933 gen_module_t * m;
934 gen_proc_t * p;
935
936 m = ctx -> mod -> gen_mod;
937 p = m -> class -> p;
938
939 jvm_generate_function_end(p);
940 }
941
942 gen_label_t *
943 oberon_generator_reserve_label(oberon_context_t * ctx)
944 {
945 gen_module_t * m;
946 gen_proc_t * p;
947 gen_label_t * l;
948
949 m = ctx -> mod -> gen_mod;
950 p = m -> class -> p;
951
952 l = GC_MALLOC(sizeof *l);
953 memset(l, 0, sizeof *l);
954
955 l -> id = jvm_new_label_id(p);
956 return l;
957 }
958
959 void
960 oberon_generate_label(oberon_context_t * ctx, gen_label_t * l)
961 {
962 gen_module_t * m;
963 gen_proc_t * p;
964
965 m = ctx -> mod -> gen_mod;
966 p = m -> class -> p;
967
968 jvm_generate_label(p, l -> id);
969 }
970
971 void
972 oberon_generate_goto(oberon_context_t * ctx, gen_label_t * l)
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(p, 0, 0, "goto L%i", l -> id);
981 }
982
983 void
984 oberon_generate_branch(oberon_context_t * ctx, oberon_expr_t * cond, bool gotoif, gen_label_t * l)
985 {
986 gen_module_t * m;
987 gen_proc_t * p;
988
989 m = ctx -> mod -> gen_mod;
990 p = m -> class -> p;
991
992 push_expr(p, cond);
993
994 if(gotoif == false)
995 {
996 /* переход если false */
997 jvm_generate(p, 1, 0, "ifeq L%i", l -> id);
998 }
999 else
1000 {
1001 /* переход если true */
1002 jvm_generate(p, 1, 0, "ifne L%i", l -> id);
1003 }
1004 }
1005
1006 static void
1007 push_varptr(gen_proc_t * p, oberon_expr_t * expr)
1008 {
1009 assert(expr -> is_item);
1010
1011 switch(expr -> item.mode)
1012 {
1013 case MODE_VAR:
1014 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1015 break;
1016 case MODE_INDEX:
1017 push_item(p, (oberon_item_t *) expr -> item.parent);
1018 push_expr(p, expr -> item.args);
1019 break;
1020 case MODE_FIELD:
1021 push_item(p, (oberon_item_t *) expr -> item.parent);
1022 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1023 break;
1024 default:
1025 gen_error("push_varptr: wat %i", expr -> item.mode);
1026 break;
1027 }
1028 }
1029
1030 static void
1031 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1032 {
1033 assert(desig -> var == NULL);
1034 assert(desig -> mode == MODE_CALL);
1035
1036 bool direct_call = false;
1037 if(desig -> parent -> mode == MODE_VAR)
1038 {
1039 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1040 {
1041 direct_call = true;
1042 }
1043 }
1044
1045 oberon_type_t * procsig;
1046 procsig = desig -> parent -> result;
1047
1048 if(direct_call == false)
1049 {
1050 /* Загружаем указатель на процедуру */
1051 push_item(p, desig -> parent);
1052 }
1053
1054 if(direct_call)
1055 {
1056 jvm_generate_push_static_links(p, desig -> parent -> var);
1057 }
1058
1059 int args_cells = 0;
1060 int result_cells = jvm_cell_size_for_type(procsig -> base);
1061
1062 int num = desig -> num_args;
1063 oberon_expr_t * arg = desig -> args;
1064 oberon_object_t * param = procsig -> decl;
1065 for(int i = 0; i < num; i++)
1066 {
1067 if(param -> class == OBERON_CLASS_VAR_PARAM)
1068 {
1069 args_cells += 2;
1070 push_varptr(p, arg);
1071 }
1072 else
1073 {
1074 args_cells += jvm_cell_size_for_type(arg -> result);
1075 push_expr(p, arg);
1076 }
1077 arg = arg -> next;
1078 param = param -> next;
1079 }
1080
1081 if(direct_call)
1082 {
1083 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1084 char * signature = jvm_get_local_procedure_signature(desig -> parent -> var);
1085 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1086 }
1087 else
1088 {
1089 char * cname = jvm_get_class_full_name(procsig);
1090 char * signature = jvm_get_procedure_signature(procsig);
1091 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1092 }
1093 }
1094
1095 void
1096 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1097 {
1098 assert(desig -> is_item);
1099 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1100 }
1101
1102 void
1103 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1104 {
1105 gen_module_t * m;
1106 gen_proc_t * p;
1107 char prefix;
1108 int cell_size;
1109
1110 m = ctx -> mod -> gen_mod;
1111 p = m -> class -> p;
1112
1113 if(expr)
1114 {
1115 push_expr(p, expr);
1116 prefix = jvm_get_prefix(expr -> result);
1117 cell_size = jvm_cell_size_for_type(expr -> result);
1118 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1119 }
1120 else
1121 {
1122 jvm_generate(p, 0, 0, "return");
1123 }
1124 }
1125
1126 static void
1127 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1128 {
1129 assert(type -> class == OBERON_TYPE_POINTER);
1130
1131 for(int i = 0; i < num; i++)
1132 {
1133 push_expr(p, arg);
1134 arg = arg -> next;
1135 }
1136
1137 jvm_generate_new(p, type -> base, num);
1138 }
1139
1140 static void
1141 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1142 {
1143 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1144 {
1145 char * full_name = jvm_get_class_full_name(to);
1146 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1147 }
1148 else
1149 {
1150 char prefix = jvm_get_prefix(from);
1151 char postfix = jvm_get_postfix(to);
1152 int from_cell_size = jvm_cell_size_for_type(from);
1153 int to_cell_size = jvm_cell_size_for_type(to);
1154
1155 jvm_generate_comment(p, "cast type class from %i(%i) to %i(%i)", from -> class, from -> size, to -> class, to -> size);
1156
1157 if(prefix == postfix)
1158 {
1159 return;
1160 }
1161
1162 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1163 }
1164 }
1165
1166 static void
1167 push_item(gen_proc_t * p, oberon_item_t * item)
1168 {
1169 switch(item -> mode)
1170 {
1171 case MODE_VAR:
1172 if(item -> var -> class == OBERON_CLASS_PROC)
1173 {
1174 jvm_generate_push_procedure_pointer(p, item -> var);
1175 }
1176 else
1177 {
1178 jvm_generate_load(p, item -> var -> gen_var);
1179 }
1180 break;
1181 case MODE_INTEGER:
1182 case MODE_BOOLEAN:
1183 case MODE_CHAR:
1184 case MODE_SET:
1185 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1186 break;
1187 case MODE_CALL:
1188 jvm_generate_call_proc(p, item);
1189 break;
1190 case MODE_INDEX:
1191 ;
1192 char postfix = jvm_get_postfix(item -> result);
1193 int cell_size = jvm_cell_size_for_postfix(postfix);
1194 push_item(p, item -> parent);
1195 push_expr(p, item -> args);
1196 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1197 break;
1198 case MODE_FIELD:
1199 push_item(p, item -> parent);
1200 jvm_generate_load(p, item -> var -> gen_var);
1201 break;
1202 case MODE_DEREF:
1203 /* Все объекты в jvm представляются как указатели */
1204 push_item(p, item -> parent);
1205 break;
1206 case MODE_NIL:
1207 jvm_generate(p, 0, 1, "aconst_null");
1208 break;
1209 case MODE_NEW:
1210 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1211 break;
1212 case MODE_REAL:
1213 jvm_generate_push_float(p, item -> real, item -> result -> size);
1214 break;
1215 case MODE_STRING:
1216 jvm_generate_push_string(p, item -> string, item -> result -> size);
1217 break;
1218 default:
1219 gen_error("push_item: unk mode %i", item -> mode);
1220 break;
1221 }
1222 }
1223
1224 static void
1225 jvm_generate_logical_not(gen_proc_t * p)
1226 {
1227 int label_done = jvm_new_label_id(p);
1228 int label_false = jvm_new_label_id(p);
1229
1230 jvm_generate(p, 1, 0, "ifne L%i", label_false);
1231 jvm_generate(p, 0, 1, "iconst_1");
1232 jvm_generate(p, 0, 0, "goto L%i", label_done);
1233 jvm_generate_label(p, label_false);
1234 jvm_generate(p, 0, 1, "iconst_0");
1235 jvm_generate_label(p, label_done);
1236 }
1237
1238 static void
1239 jvm_generate_abs(gen_proc_t * p, char prefix)
1240 {
1241 char t = jvm_get_type_of_prefix(prefix);
1242 int cell_size = jvm_cell_size_for_postfix(prefix);
1243 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1244 }
1245
1246 static char *
1247 jvm_get_compare_postfix(int op)
1248 {
1249 char * cmpop = "";
1250 switch(op)
1251 {
1252 case OP_EQ:
1253 cmpop = "eq";
1254 break;
1255 case OP_NEQ:
1256 cmpop = "ne";
1257 break;
1258 case OP_LSS:
1259 cmpop = "lt";
1260 break;
1261 case OP_LEQ:
1262 cmpop = "le";
1263 break;
1264 case OP_GRT:
1265 cmpop = "gt";
1266 break;
1267 case OP_GEQ:
1268 cmpop = "ge";
1269 break;
1270 default:
1271 gen_error("jvm_generate_compare_op: wat");
1272 break;
1273 }
1274 return cmpop;
1275 }
1276
1277 static void
1278 jvm_generate_compare_op(gen_proc_t * p, oberon_type_t * t, int op)
1279 {
1280 char prefix = jvm_get_prefix(t);
1281 int label_true = jvm_new_label_id(p);
1282 int label_done = jvm_new_label_id(p);
1283 int cell_size = jvm_cell_size_for_type(t);
1284 char * cmpop = jvm_get_compare_postfix(op);
1285
1286 if(prefix == 'l')
1287 {
1288 jvm_generate(p, 2 * cell_size, 1, "lcmp");
1289 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1290 }
1291 else if(prefix == 'f' || prefix == 'd')
1292 {
1293 char fop;
1294 if(op == OP_EQ || op == OP_NEQ || op == OP_GRT || op == OP_GEQ)
1295 {
1296 fop = 'l';
1297 }
1298 else
1299 {
1300 fop = 'g';
1301 }
1302 jvm_generate(p, 2 * cell_size, 1, "%ccmp%c", prefix, fop);
1303 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1304 }
1305 else
1306 {
1307 jvm_generate(p, 2 * cell_size, 0, "if_%ccmp%s L%i", prefix, cmpop, label_true);
1308 }
1309
1310 jvm_generate(p, 0, 1, "iconst_0");
1311 jvm_generate(p, 0, 0, "goto L%i", label_done);
1312 jvm_generate_label(p, label_true);
1313 jvm_generate(p, 0, 1, "iconst_1");
1314 jvm_generate_label(p, label_done);
1315 }
1316
1317 static void
1318 jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
1319 {
1320 char prefix = jvm_get_prefix(t);
1321 int cell_size = jvm_cell_size_for_type(t);
1322 switch(op)
1323 {
1324 case OP_UNARY_MINUS:
1325 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1326 break;
1327 case OP_COMPLEMENTATION:
1328 jvm_generate_push_int_size(p, -1, t -> size);
1329 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1330 break;
1331 case OP_LOGIC_NOT:
1332 jvm_generate_logical_not(p);
1333 break;
1334 case OP_ABS:
1335 jvm_generate_abs(p, prefix);
1336 break;
1337
1338 case OP_ADD:
1339 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1340 break;
1341 case OP_SUB:
1342 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1343 break;
1344 case OP_MUL:
1345 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1346 break;
1347 case OP_DIV:
1348 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1349 break;
1350 case OP_MOD:
1351 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1352 break;
1353 case OP_UNION:
1354 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1355 break;
1356 case OP_INTERSECTION:
1357 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1358 break;
1359 case OP_DIFFERENCE:
1360 jvm_generate_push_int_size(p, -1, t -> size);
1361 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1362 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1363 break;
1364 case OP_SYM_DIFFERENCE:
1365 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1366 break;
1367
1368 case OP_EQ:
1369 case OP_NEQ:
1370 case OP_LSS:
1371 case OP_LEQ:
1372 case OP_GRT:
1373 case OP_GEQ:
1374 jvm_generate_compare_op(p, t, op);
1375 break;
1376 default:
1377 gen_error("jvm_generate_operator: unk op %i", op);
1378 break;
1379 }
1380 }
1381
1382 static void
1383 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1384 {
1385 int label_calc_b = jvm_new_label_id(p);
1386 int label_done = jvm_new_label_id(p);
1387
1388 /* a OR b -- если a, то TRUE, иначе b */
1389
1390 push_expr(p, a);
1391 jvm_generate(p, 1, 0, "ifeq L%i", label_calc_b);
1392 jvm_generate(p, 0, 1, "iconst_1");
1393 jvm_generate(p, 0, 0, "goto L%i", label_done);
1394 jvm_generate_label(p, label_calc_b);
1395 push_expr(p, b);
1396 jvm_generate_label(p, label_done);
1397 }
1398
1399 static void
1400 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1401 {
1402 int label_false = jvm_new_label_id(p);
1403 int label_done = jvm_new_label_id(p);
1404
1405 /* a AND b -- если a, то b, иначе FALSE */
1406
1407 push_expr(p, a);
1408 jvm_generate(p, 1, 0, "ifeq L%i", label_false);
1409 push_expr(p, b);
1410 jvm_generate(p, 0, 0, "goto L%i", label_done);
1411 jvm_generate_label(p, label_false);
1412 jvm_generate(p, 0, 1, "iconst_0");
1413 jvm_generate_label(p, label_done);
1414 }
1415
1416 static void
1417 jvm_generate_range(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1418 {
1419 /* { a } == 1 << a */
1420 /* { a..b } == (a <= b) ? ((2 << b) - (1 << a)) : (0); */
1421
1422 char prefix;
1423 int cell_size;
1424 oberon_type_t * type;
1425 gen_var_t * ra;
1426 gen_var_t * rb;
1427 int label_else;
1428 int label_end;
1429
1430 type = a -> result;
1431 cell_size = jvm_cell_size_for_type(type);
1432 prefix = jvm_get_prefix(type);
1433
1434 if(b == NULL)
1435 {
1436 jvm_generate_push_int_size(p, 1, type -> size);
1437 push_expr(p, a);
1438 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1439 }
1440 else
1441 {
1442 ra = jvm_create_function_temp_var(p, type -> gen_type);
1443 rb = jvm_create_function_temp_var(p, type -> gen_type);
1444 jvm_generate_var(ra);
1445 jvm_generate_var(rb);
1446 jvm_generate_var_initialization(p, ra);
1447 jvm_generate_var_initialization(p, rb);
1448 label_else = jvm_new_label_id(p);
1449 label_end = jvm_new_label_id(p);
1450
1451 push_expr(p, a);
1452 jvm_generate_store(p, ra);
1453 push_expr(p, b);
1454 jvm_generate_store(p, rb);
1455
1456 jvm_generate_load(p, ra);
1457 jvm_generate_load(p, rb);
1458 jvm_generate(p, 2 * cell_size, 0, "if_%ccmpgt L%i", prefix, label_else);
1459
1460 jvm_generate_push_int_size(p, 2, type -> size);
1461 jvm_generate_load(p, rb);
1462 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1463 jvm_generate_push_int_size(p, 2, type -> size);
1464 jvm_generate_load(p, ra);
1465 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1466 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1467 jvm_generate(p, 0, 0, "goto L%i", label_end);
1468
1469 jvm_generate_label(p, label_else);
1470 jvm_generate_push_int_size(p, 0, type -> size);
1471 jvm_generate_label(p, label_end);
1472 }
1473
1474 /* TODO free registers */
1475 }
1476
1477 static void
1478 jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1479 {
1480 oberon_type_t * t = a -> result;
1481 int cell_size = jvm_cell_size_for_type(t);
1482 char prefix = jvm_get_prefix(t);
1483 int label_else = jvm_new_label_id(p);
1484 int label_end = jvm_new_label_id(p);
1485
1486 jvm_generate_push_int_size(p, 1, t -> size);
1487 push_expr(p, a);
1488 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1489 push_expr(p, b);
1490 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1491
1492 if(cell_size > 1)
1493 {
1494 jvm_generate(p, cell_size, 0, "lcmp");
1495 }
1496
1497 jvm_generate(p, 1, 0, "ifeq L%i", label_else);
1498 jvm_generate(p, 0, 1, "iconst_1");
1499 jvm_generate(p, 0, 0, "goto L%i", label_end);
1500 jvm_generate_label(p, label_else);
1501 jvm_generate(p, 0, 1, "iconst_0");
1502 jvm_generate_label(p, label_end);
1503 }
1504
1505 static void
1506 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1507 {
1508 oberon_type_t * preq = oper -> left -> result;
1509 int op = oper -> op;
1510 switch(op)
1511 {
1512 case OP_CAST:
1513 push_expr(p, oper -> left);
1514 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1515 break;
1516 case OP_COMPLEMENTATION:
1517 case OP_UNARY_MINUS:
1518 case OP_LOGIC_NOT:
1519 case OP_ABS:
1520 push_expr(p, oper -> left);
1521 jvm_generate_operator(p, preq, op);
1522 break;
1523
1524 case OP_ADD:
1525 case OP_SUB:
1526 case OP_MUL:
1527 case OP_DIV:
1528 case OP_MOD:
1529
1530 case OP_UNION:
1531 case OP_INTERSECTION:
1532 case OP_DIFFERENCE:
1533 case OP_SYM_DIFFERENCE:
1534
1535 case OP_EQ:
1536 case OP_NEQ:
1537 case OP_LSS:
1538 case OP_LEQ:
1539 case OP_GRT:
1540 case OP_GEQ:
1541 push_expr(p, oper -> left);
1542 push_expr(p, oper -> right);
1543 jvm_generate_operator(p, preq, op);
1544 break;
1545
1546 case OP_LOGIC_OR:
1547 jvm_generate_logical_or(p, oper -> left, oper -> right);
1548 break;
1549 case OP_LOGIC_AND:
1550 jvm_generate_logical_and(p, oper -> left, oper -> right);
1551 break;
1552
1553 case OP_IS:
1554 preq = oper -> right -> result;
1555 char * cname = jvm_get_class_full_name(preq);
1556 push_expr(p, oper -> left);
1557 jvm_generate(p, 1, 1, "instanceof %s", cname);
1558 break;
1559 case OP_RANGE:
1560 jvm_generate_range(p, oper -> left, oper -> right);
1561 break;
1562 case OP_IN:
1563 jvm_generate_in(p, oper -> left, oper -> right);
1564 break;
1565 default:
1566 gen_error("push_oper: unk op %i", op);
1567 break;
1568 }
1569 }
1570
1571 static void
1572 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1573 {
1574 if(expr -> is_item)
1575 {
1576 push_item(p, (oberon_item_t *) expr);
1577 }
1578 else
1579 {
1580 push_operator(p, (oberon_oper_t *) expr);
1581 }
1582 }
1583
1584 static void
1585 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1586 {
1587 assert(dst -> is_item);
1588 oberon_item_t * item = (oberon_item_t *) dst;
1589
1590 if(dst -> result -> class == OBERON_TYPE_ARRAY
1591 || src -> result -> class == OBERON_TYPE_ARRAY)
1592 {
1593 push_expr(p, dst);
1594 push_expr(p, src);
1595 jvm_generate_copy_array(p, dst -> result);
1596 }
1597 else if(dst -> result -> class == OBERON_TYPE_RECORD
1598 || src -> result -> class == OBERON_TYPE_RECORD)
1599 {
1600 push_expr(p, dst);
1601 push_expr(p, src);
1602 jvm_generate_copy_record(p, dst -> result);
1603 }
1604 else switch(item -> mode)
1605 {
1606 case MODE_VAR:
1607 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1608 push_expr(p, src);
1609 jvm_generate_store(p, item -> var -> gen_var);
1610 break;
1611 case MODE_INDEX:
1612 ;
1613 char postfix = jvm_get_postfix(src -> result);
1614 int cell_size = jvm_cell_size_for_postfix(postfix);
1615 assert(item -> parent -> is_item);
1616 push_item(p, (oberon_item_t *) item -> parent);
1617 push_expr(p, item -> args);
1618 push_expr(p, src);
1619 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1620 break;
1621 case MODE_FIELD:
1622 assert(item -> parent -> is_item);
1623 push_item(p, (oberon_item_t *) item -> parent);
1624 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1625 push_expr(p, src);
1626 jvm_generate_store(p, item -> var -> gen_var);
1627 break;
1628 default:
1629 gen_error("store_expr: unk mode %i", item -> mode);
1630 break;
1631 }
1632 }
1633
1634 void
1635 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1636 {
1637 gen_module_t * m;
1638 gen_proc_t * p;
1639
1640 m = ctx -> mod -> gen_mod;
1641 p = m -> class -> p;
1642
1643 store_expr(p, dst, src);
1644 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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