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Для обычных процедур всегда генерируется return
[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.h"
13 #include "generator-jvm.h"
14 #include "generator-jvm-abi.h"
15 #include "generator-jvm-asm.h"
16 #include "generator-jvm-basic.h"
17
18 static void
19 push_item(gen_proc_t * p, oberon_item_t * item);
20
21 static void
22 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num);
23
24 /*
25 * Генерирует код для инициализации массива со статическим базовым типом
26 * ( aref -- )
27 */
28
29 static void
30 jvm_generate_array_initialization(gen_proc_t * p, oberon_type_t * arr)
31 {
32 int dim = 0;
33 oberon_type_t * base = arr;
34 while(base -> class == OBERON_TYPE_ARRAY)
35 {
36 dim += 1;
37 base = base -> base;
38 }
39
40 if(base -> class != OBERON_TYPE_RECORD)
41 {
42 jvm_generate(p, 1, 0, "pop");
43 return;
44 }
45
46 struct {
47 int reg_index;
48 int reg_length;
49 int start;
50 int end;
51 } loop[dim];
52
53 int reg_dst;
54 reg_dst = jvm_alloc_register_untyped(p -> rf, false);
55 jvm_generate(p, 1, 0, "astore %i", reg_dst);
56
57 /*
58 * Входящие параметры заграблены.
59 * Теперь генерируем эквивалентный код:
60 * int i = 0;
61 * int len = dst.length
62 * while(i < len)
63 * {
64 * ...
65 * {
66 * dst[i, ...] = new record;
67 * }
68 * ...
69 * i += 1;
70 * }
71 * Где "..." такой же код (начало и конец) для следующей размерности.
72 */
73
74 for(int i = 0; i < dim; i++)
75 {
76 loop[i].reg_index = jvm_alloc_register_untyped(p -> rf, false);
77 loop[i].reg_length = jvm_alloc_register_untyped(p -> rf, false);
78 loop[i].start = jvm_new_label_id(p);
79 loop[i].end = jvm_new_label_id(p);
80
81 jvm_generate(p, 0, 1, "iconst_0");
82 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_index);
83
84 jvm_generate(p, 0, 1, "aload %i", reg_dst);
85 jvm_generate(p, 1, 1, "arraylength");
86 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_length);
87
88 /* if(i >= len) goto end; */
89 jvm_generate_label(p, loop[i].start);
90 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
91 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_length);
92 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
93 }
94
95 jvm_generate(p, 0, 1, "aload %i", reg_dst);
96 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
97 for(int i = 1; i < dim; i++)
98 {
99 jvm_generate(p, 2, 1, "aaload");
100 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
101 }
102 jvm_generate_new(p, base, 0);
103 jvm_generate(p, 3, 0, "aastore");
104
105 for(int i = dim - 1; i >= 0; i--)
106 {
107 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].reg_index);
108 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
109 jvm_generate_label(p, loop[i].end);
110 }
111 }
112
113 static void
114 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num)
115 {
116 int dim;
117 char * cname;
118 char * desc;
119 oberon_type_t * base;
120
121 switch(type -> class)
122 {
123 case OBERON_TYPE_INTEGER:
124 case OBERON_TYPE_BOOLEAN:
125 case OBERON_TYPE_PROCEDURE:
126 case OBERON_TYPE_REAL:
127 case OBERON_TYPE_POINTER:
128 gen_error("jvm_generate_new_static: static alocation not allowed");
129 break;
130 case OBERON_TYPE_RECORD:
131 assert(num == 0);
132 cname = jvm_get_class_full_name(type);
133 jvm_generate(p, 0, 1, "new %s", cname);
134 jvm_generate(p, 1, 2, "dup");
135 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", cname);
136 break;
137 case OBERON_TYPE_ARRAY:
138 dim = 0;
139 base = type;
140 desc = jvm_get_descriptor(type);
141 while(base -> class == OBERON_TYPE_ARRAY)
142 {
143 if(num > 0)
144 {
145 assert(base -> size == 0);
146 num -= 1;
147 }
148 else
149 {
150 assert(base -> size > 0);
151 jvm_generate_push_int(p, base -> size);
152 }
153 dim += 1;
154 base = base -> base;
155 }
156
157 assert(num == 0);
158 jvm_generate(p, dim, 1, "multianewarray %s %i", desc, dim);
159 jvm_generate(p, 1, 2, "dup");
160 jvm_generate_array_initialization(p, type);
161 break;
162 default:
163 gen_error("jvm_generate_new_static: unk type class %i", type -> class);
164 break;
165 }
166 }
167
168 /*
169 * Генерирует код для копирования полей из первой записи во вторую.
170 * ( aref_dst aref_src -- )
171 * dst := src;
172 */
173
174 static void
175 jvm_generate_copy_record(gen_proc_t * p, oberon_type_t * rec)
176 {
177 assert(rec -> class == OBERON_TYPE_RECORD);
178 char * desc = jvm_get_descriptor(rec);
179 char * cname = jvm_get_class_full_name(rec);
180 jvm_generate(p, 1 + 1, 0, "invokestatic %s/$COPY$(%s%s)V", cname, desc, desc);
181 }
182
183 /*
184 * Генерирует кода для копирования массивов.
185 * ( aref_dst aref_src -- )
186 * dst := src;
187 */
188
189 static void
190 jvm_generate_copy_array(gen_proc_t * p, oberon_type_t * arr)
191 {
192 int dim = 0;
193 oberon_type_t * base = arr;
194 while(base -> class == OBERON_TYPE_ARRAY)
195 {
196 dim += 1;
197 base = base -> base;
198 }
199
200 struct {
201 int reg_index;
202 int reg_length;
203 int start;
204 int end;
205 } loop[dim];
206
207 int reg_dst = jvm_alloc_register_untyped(p -> rf, false);
208 int reg_src = jvm_alloc_register_untyped(p -> rf, false);
209 jvm_generate(p, 1, 0, "astore %i", reg_src);
210 jvm_generate(p, 1, 0, "astore %i", reg_dst);
211
212 /*
213 * Входящие параметры заграблены.
214 * Теперь генерируем эквивалентный код:
215 * int i = 0;
216 * int len = src.length
217 * while(i < len)
218 * {
219 * ...
220 * {
221 * copy from src[i, ...] to dst[i, ...];
222 * }
223 * ...
224 * i += 1;
225 * }
226 * Где "..." такой же код (начало и конец) для следующей размерности.
227 */
228
229 for(int i = 0; i < dim; i++)
230 {
231 loop[i].reg_index = jvm_alloc_register_untyped(p -> rf, false);
232 loop[i].reg_length = jvm_alloc_register_untyped(p -> rf, false);
233 loop[i].start = jvm_new_label_id(p);
234 loop[i].end = jvm_new_label_id(p);
235
236 jvm_generate(p, 0, 1, "iconst_0");
237 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_index);
238
239 jvm_generate(p, 0, 1, "aload %i", reg_src);
240 jvm_generate(p, 1, 1, "arraylength");
241 jvm_generate(p, 1, 0, "istore %i", loop[i].reg_length);
242
243 /* if(i >= len) goto end; */
244 jvm_generate_label(p, loop[i].start);
245 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
246 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_length);
247 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
248 }
249
250 if(base -> class == OBERON_TYPE_RECORD)
251 {
252 /* Получаем записи по индексам ( -- dst src ) */
253
254 jvm_generate(p, 0, 1, "aload %i", reg_dst);
255 for(int i = 0; i < dim; i++)
256 {
257 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
258 jvm_generate(p, 2, 1, "aaload");
259 }
260
261 jvm_generate(p, 0, 1, "aload %i", reg_src);
262 for(int i = 0; i < dim; i++)
263 {
264 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
265 jvm_generate(p, 2, 1, "aaload");
266 }
267
268 /* Копируем записи ( dst src -- ) */
269 jvm_generate_copy_record(p, base);
270 }
271 else
272 {
273 char postfix = jvm_get_postfix(base);
274 int cell_size = jvm_cell_size_for_postfix(postfix);
275
276 /* Получаем массивы и индексы ( -- dst i src i ) */
277
278 jvm_generate(p, 0, 1, "aload %i", reg_dst);
279 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
280 for(int i = 1; i < dim; i++)
281 {
282 jvm_generate(p, 2, 1, "aaload");
283 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
284 }
285
286 jvm_generate(p, 0, 1, "aload %i", reg_src);
287 jvm_generate(p, 0, 1, "iload %i", loop[0].reg_index);
288 for(int i = 1; i < dim; i++)
289 {
290 jvm_generate(p, 2, 1, "aaload");
291 jvm_generate(p, 0, 1, "iload %i", loop[i].reg_index);
292 }
293
294 /* Копируем значения ( dst i src i -- ) */
295 jvm_generate(p, 2, cell_size, "%caload", postfix);
296 jvm_generate(p, 2 + cell_size, 0, "%castore", postfix);
297 }
298
299 for(int i = dim - 1; i >= 0; i--)
300 {
301 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].reg_index);
302 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
303 jvm_generate_label(p, loop[i].end);
304 }
305 }
306
307 static void
308 jvm_generate_push_procedure_pointer(gen_proc_t * p, oberon_object_t * proc)
309 {
310 char * full_name = jvm_get_field_full_name_safe(proc);
311 char * desc = jvm_get_descriptor(proc -> type);
312 jvm_generate(p, 0, 1, "getstatic %s/pointer %s", full_name, desc);
313 }
314
315 void
316 oberon_generator_init_context(oberon_context_t * ctx)
317 {
318 gen_context_t * gen_context = GC_MALLOC(sizeof *gen_context);
319 memset(gen_context, 0, sizeof *gen_context);
320
321 ctx -> gen_context = gen_context;
322 gen_context -> dir = ".";
323 }
324
325 void
326 oberon_generator_destroy_context(oberon_context_t * ctx)
327 {
328 }
329
330 static void
331 oberon_generate_procedure_class(const char * dir, oberon_type_t * proc)
332 {
333 FILE * fp;
334 char * cname;
335 char * signature;
336 struct gen_class * class;
337
338 cname = jvm_get_class_full_name(proc);
339 class = jvm_create_class(dir, cname);
340 fp = class -> fp;
341
342 fprintf(fp, ".source SYSTEM\n");
343 fprintf(fp, ".class public abstract %s\n", cname);
344 fprintf(fp, ".super java/lang/Object\n\n");
345
346 fprintf(fp, ".method <init>()V\n");
347 fprintf(fp, " aload_0\n");
348 fprintf(fp, " invokespecial java/lang/Object/<init>()V\n");
349 fprintf(fp, " return\n");
350 fprintf(fp, ".end method\n\n");
351
352 signature = jvm_get_procedure_signature(proc);
353
354 fprintf(fp, ".method public abstract invoke%s\n", signature);
355 fprintf(fp, ".end method\n\n");
356
357 jvm_destroy_class(class);
358 }
359
360 static void
361 oberon_generate_procedure_pointer_class(const char * dir, oberon_object_t * proc)
362 {
363 FILE * fp;
364 char * cname;
365 char * abscname;
366 char * absdesc;
367 char * signature;
368 struct gen_class * class;
369
370 cname = jvm_get_field_full_name_safe(proc);
371 class = jvm_create_class(dir, cname);
372 abscname = jvm_get_class_full_name(proc -> type);
373 absdesc = jvm_get_descriptor(proc -> type);
374 fp = class -> fp;
375
376 fprintf(fp, ".source %s\n", proc -> module -> name);
377 fprintf(fp, ".class public %s\n", cname);
378 fprintf(fp, ".super %s\n\n", abscname);
379
380 fprintf(fp, ".field public static pointer %s\n\n", absdesc);
381
382 fprintf(fp, ".method private <init>()V\n");
383 fprintf(fp, " aload_0\n");
384 fprintf(fp, " invokespecial %s/<init>()V\n", abscname);
385 fprintf(fp, " return\n");
386 fprintf(fp, ".end method\n\n");
387
388 fprintf(fp, ".method static <clinit>()V\n");
389 fprintf(fp, " .limit stack 2\n");
390 fprintf(fp, " new %s\n", cname);
391 fprintf(fp, " dup\n");
392 fprintf(fp, " invokespecial %s/<init>()V\n", cname);
393 fprintf(fp, " putstatic %s/pointer %s\n", cname, absdesc);
394 fprintf(fp, " return\n");
395 fprintf(fp, ".end method\n\n");
396
397 signature = jvm_get_procedure_signature(proc -> type);
398
399 gen_proc_t * p = jvm_create_proc(class);
400 jvm_generate_function_header(p, "public", "invoke", signature);
401 jvm_alloc_register_untyped(p -> rf, false);
402
403 int use_size = 0;
404 int num = proc -> type -> num_decl;
405 oberon_object_t * param = proc -> type -> decl;
406 for(int i = 0; i < num; i++)
407 {
408 gen_type_t * t = param -> type -> gen_type;
409 if(param -> class == OBERON_CLASS_VAR_PARAM)
410 {
411 int reg = jvm_alloc_register_untyped(p -> rf, true);
412 jvm_generate(p, 0, 1, "aload %i", reg);
413 jvm_generate(p, 0, 1, "iload %i", reg + 1);
414 }
415 else
416 {
417 int reg = jvm_alloc_register_untyped(p -> rf, t -> wide);
418 jvm_generate(p, 0, t -> cell_size, "%cload %i", t -> prefix, reg);
419 }
420 use_size += t -> cell_size;
421 param = param -> next;
422 }
423
424 char * full_name = jvm_get_field_full_name(proc);
425 int cell_size = jvm_cell_size_for_type(proc -> type -> base);
426 jvm_generate(p, use_size, cell_size, "invokestatic %s%s", full_name, signature);
427
428 if(proc -> type -> base -> class == OBERON_TYPE_NOTYPE)
429 {
430 jvm_generate(p, 0, 0, "return");
431 }
432 else
433 {
434 char prefix = jvm_get_prefix(proc -> type -> base);
435 jvm_generate(p, cell_size, 0, "%creturn", prefix);
436 }
437
438 jvm_generate_function_end(p);
439
440 jvm_destroy_class(class);
441 }
442
443 static void
444 oberon_generate_record_class(const char * dir, gen_module_t * m, oberon_type_t * rec)
445 {
446 char * cname;
447 struct gen_class * class;
448
449 /* Устанавливаем новоый id */
450 rec -> gen_type -> rec_id = m -> rec_id;
451 m -> rec_id += 1;
452
453 cname = jvm_get_class_full_name(rec);
454 class = jvm_create_class(dir, cname);
455
456 fprintf(class -> fp, ".source %s\n", rec -> module -> name);
457 fprintf(class -> fp, ".class public %s\n", cname);
458
459 if(rec -> base == NULL)
460 {
461 fprintf(class -> fp, ".super java/lang/Object\n\n");
462 }
463 else
464 {
465 class -> base = rec -> base -> gen_type -> class;
466 fprintf(class -> fp, ".super %s\n\n", class -> base -> full_name);
467 }
468
469 rec -> gen_type -> class = class;
470 }
471
472 void
473 oberon_generator_init_type(oberon_context_t * ctx, oberon_type_t * type)
474 {
475 gen_type_t * t = GC_MALLOC(sizeof *t);
476 memset(t, 0, sizeof *t);
477 type -> gen_type = t;
478
479 gen_context_t * c;
480 c = ctx -> gen_context;
481
482 gen_module_t * m;
483 switch(type -> class)
484 {
485 case OBERON_TYPE_NOTYPE:
486 case OBERON_TYPE_INTEGER:
487 case OBERON_TYPE_BOOLEAN:
488 case OBERON_TYPE_ARRAY:
489 case OBERON_TYPE_POINTER:
490 case OBERON_TYPE_REAL:
491 case OBERON_TYPE_CHAR:
492 case OBERON_TYPE_STRING:
493 case OBERON_TYPE_SET:
494 case OBERON_TYPE_NIL:
495 case OBERON_TYPE_SYSTEM_BYTE:
496 case OBERON_TYPE_SYSTEM_PTR:
497 break;
498 case OBERON_TYPE_RECORD:
499 m = type -> module -> gen_mod;
500 oberon_generate_record_class(c -> dir, m, type);
501 break;
502 case OBERON_TYPE_PROCEDURE:
503 oberon_generate_procedure_class(c -> dir, type);
504 break;
505 default:
506 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
507 break;
508 }
509
510 if(type -> class != OBERON_TYPE_NOTYPE)
511 {
512 t -> wide = jvm_is_wide_type(type);
513 t -> prefix = jvm_get_prefix(type);
514 t -> postfix = jvm_get_postfix(type);
515 }
516
517 t -> cell_size = jvm_cell_size_for_type(type);
518
519 if(type -> class != OBERON_TYPE_NIL)
520 {
521 t -> desc = jvm_get_descriptor(type);
522 }
523 }
524
525 void
526 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
527 {
528 struct gen_class * class;
529 class = rec -> gen_type -> class;
530
531 int num = rec -> num_decl;
532 oberon_object_t * field = rec -> decl;
533 for(int i = 0; i < num; i++)
534 {
535 jvm_generate_var(field -> gen_var);
536 field = field -> next;
537 }
538
539 /* Стандартный конструктор класса */
540 /* Инициализирует внутренние статические записи и массивы */
541 gen_proc_t * p = jvm_create_proc(class);
542 jvm_generate_function_header(p, "public", "<init>", "()V");
543 jvm_alloc_register_untyped(p -> rf, false);
544 jvm_generate(p, 0, 1, "aload_0");
545 if(class -> base)
546 {
547 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
548 }
549 else
550 {
551 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
552 }
553 num = rec -> num_decl;
554 field = rec -> decl;
555 for(int i = 0; i < num; i++)
556 {
557 jvm_generate(p, 0, 1, "aload_0");
558 jvm_generate_var_initialization(p, field -> gen_var);
559
560 if(field -> type -> class == OBERON_TYPE_RECORD
561 || field -> type -> class == OBERON_TYPE_ARRAY)
562 {
563 jvm_generate(p, 0, 1, "aload_0");
564 jvm_generate_ldst_prepare(p, field -> gen_var);
565 jvm_generate_new(p, field -> type, 0);
566 jvm_generate_store(p, field -> gen_var);
567 }
568 field = field -> next;
569 }
570 jvm_generate(p, 0, 0, "return");
571 jvm_generate_function_end(p);
572
573 /* Метод для копирования полей класса */
574 /* reg0 == src -> reg1 == dst */
575 p = jvm_create_proc(class);
576 char * signature = new_string("(%s%s)V", rec -> gen_type -> desc, rec -> gen_type -> desc);
577 jvm_generate_function_header(p, "public static", "$COPY$", signature);
578
579 gen_var_t * copy_dst = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "dst", rec -> gen_type);
580 gen_var_t * copy_src = jvm_create_function_var(p, JVM_STORAGE_REGISTER, "src", rec -> gen_type);
581 jvm_generate_var(copy_dst);
582 jvm_generate_var(copy_src);
583 jvm_generate_var_initialization(p, copy_dst);
584 jvm_generate_var_initialization(p, copy_src);
585
586 num = rec -> num_decl;
587 field = rec -> decl;
588 for(int i = 0; i < num; i++)
589 {
590 if(field -> type -> class == OBERON_TYPE_RECORD)
591 {
592 jvm_generate_load(p, copy_dst);
593 jvm_generate_load(p, field -> gen_var);
594 jvm_generate_load(p, copy_src);
595 jvm_generate_load(p, field -> gen_var);
596 jvm_generate_copy_record(p, field -> type);
597 }
598 else if(field -> type -> class == OBERON_TYPE_ARRAY)
599 {
600 jvm_generate_load(p, copy_dst);
601 jvm_generate_load(p, field -> gen_var);
602 jvm_generate_load(p, copy_src);
603 jvm_generate_load(p, field -> gen_var);
604 jvm_generate_copy_array(p, field -> type);
605 }
606 else
607 {
608 jvm_generate_load(p, copy_dst);
609 jvm_generate_ldst_prepare(p, field -> gen_var);
610 jvm_generate_load(p, copy_src);
611 jvm_generate_load(p, field -> gen_var);
612 jvm_generate_store(p, field -> gen_var);
613 }
614 field = field -> next;
615 }
616 jvm_generate(p, 0, 0, "return");
617 jvm_generate_function_end(p);
618
619 jvm_destroy_class(class);
620 }
621
622 void
623 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
624 {
625 gen_module_t * m;
626 m = ctx -> mod -> gen_mod;
627
628 struct gen_class * class;
629 class = m -> class;
630
631 gen_proc_t * p;
632 struct gen_class * c;
633 char * name = var -> name;
634 gen_type_t * t = var -> type -> gen_type;
635
636 assert(name);
637 if(t == NULL)
638 {
639 gen_error("uninitialized type class %i", var -> type -> class);
640 }
641
642 switch(var -> class)
643 {
644 case OBERON_CLASS_VAR_PARAM:
645 p = var -> parent -> gen_proc;
646 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VARPTR, name, t);
647 break;
648 case OBERON_CLASS_PARAM:
649 p = var -> parent -> gen_proc;
650 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_PARAM_VAR, name, t);
651 break;
652 case OBERON_CLASS_FIELD:
653 c = var -> parent_type -> gen_type -> class;
654 var -> gen_var = jvm_create_class_var(c, JVM_STORAGE_FIELD_VAR, name, t);
655 break;
656 case OBERON_CLASS_VAR:
657 if(var -> local)
658 {
659 p = var -> parent -> gen_proc;
660 var -> gen_var = jvm_create_function_var(p, JVM_STORAGE_FRAME_VAR, name, t);
661 }
662 else
663 {
664 var -> gen_var = jvm_create_class_var(class, JVM_STORAGE_STATIC_VAR, name, t);
665 jvm_generate_var(var -> gen_var);
666 }
667 break;
668 default:
669 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
670 break;
671 }
672 }
673
674 void
675 oberon_generator_init_temp_var(oberon_context_t * ctx, oberon_object_t * var)
676 {
677 assert(var -> class == OBERON_CLASS_VAR);
678
679 gen_module_t * m;
680 m = ctx -> mod -> gen_mod;
681
682 gen_proc_t * p;
683 p = m -> class -> p;
684
685 gen_type_t * t;
686 t = var -> type -> gen_type;
687
688 var -> gen_var = jvm_create_function_temp_var(p, t);
689 jvm_generate_var(var -> gen_var);
690 jvm_generate_var_initialization(p, var -> gen_var);
691 }
692
693 void
694 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
695 {
696 struct gen_class * class = proc -> module -> gen_mod -> class;
697 proc -> gen_proc = jvm_create_proc(class);
698 proc -> gen_proc -> full_name = jvm_get_field_full_name_safe(proc);
699 jvm_create_static_links(proc);
700 }
701
702 void
703 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
704 {
705 gen_module_t * m = GC_MALLOC(sizeof *m);
706 memset(m, 0, sizeof *m);
707 mod -> gen_mod = m;
708
709 gen_context_t * c;
710 c = ctx -> gen_context;
711
712 struct gen_class * class;
713 class = jvm_create_class(c -> dir, mod -> name);
714
715 fprintf(class -> fp, ".source %s\n", mod -> name);
716 fprintf(class -> fp, ".class %s\n", mod -> name);
717 fprintf(class -> fp, ".super java/lang/Object\n\n");
718
719 fprintf(class -> fp, ".field private static $INITIALIZED$ Z\n\n");
720
721 m -> class = class;
722
723 c -> current_m = m;
724 }
725
726 void
727 oberon_generator_fini_module(oberon_module_t * mod)
728 {
729 jvm_destroy_class(mod -> gen_mod -> class);
730 }
731
732 static void
733 push_expr(gen_proc_t * p, oberon_expr_t * expr);
734
735 void
736 oberon_generate_begin_module(oberon_context_t * ctx)
737 {
738 gen_proc_t * p;
739 int label_cont;
740 struct gen_class * class;
741
742 class = ctx -> mod -> gen_mod -> class;
743
744 p = jvm_create_proc(class);
745 jvm_generate_function_header(p, "public static", "BEGIN", "()V");
746
747 label_cont = jvm_new_label_id(p);
748 jvm_generate(p, 0, 1, "getstatic %s/$INITIALIZED$ Z", class -> full_name);
749 jvm_generate(p, 1, 0, "ifeq L%i", label_cont);
750 jvm_generate(p, 0, 0, "return");
751 jvm_generate_label(p, label_cont);
752
753 jvm_generate(p, 0, 1, "iconst_1");
754 jvm_generate(p, 1, 0, "putstatic %s/$INITIALIZED$ Z", class -> full_name);
755
756 /* Инициализация переменных объявленных в модуле */
757 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
758 while(x != NULL)
759 {
760 if(x -> class == OBERON_CLASS_MODULE)
761 {
762 if(!x -> module -> intrinsic)
763 {
764 jvm_generate(p, 0, 0, "invokestatic %s/BEGIN()V", x -> module -> gen_mod -> class -> full_name);
765 }
766 }
767 else if(x -> class == OBERON_CLASS_VAR)
768 {
769 jvm_generate_var_initialization(p, x -> gen_var);
770 if(x -> type -> class == OBERON_TYPE_ARRAY
771 || x -> type -> class == OBERON_TYPE_RECORD)
772 {
773 jvm_generate_ldst_prepare(p, x -> gen_var);
774 jvm_generate_new(p, x -> type, 0);
775 jvm_generate_store(p, x -> gen_var);
776 }
777 }
778
779 x = x -> next;
780 }
781 }
782
783 void
784 oberon_generate_end_module(oberon_context_t * ctx)
785 {
786 struct gen_class * class = ctx -> mod -> gen_mod -> class;
787 gen_proc_t * p = class -> p;
788
789 jvm_generate(p, 0, 0, "return");
790 jvm_generate_function_end(class -> p);
791
792 p = jvm_create_proc(class);
793 jvm_generate_function_header(p, "private", "<init>", "()V");
794 jvm_alloc_register_untyped(p -> rf, false);
795 jvm_generate(p, 0, 1, "aload_0");
796 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
797 jvm_generate(p, 0, 0, "return");
798 jvm_generate_function_end(class -> p);
799 }
800
801 /*
802 * Генерирует код для получения размера измерения массива
803 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
804 * ( aref -- int )
805 */
806
807 static void
808 jvm_generate_array_len(gen_proc_t * p, int dim)
809 {
810 while(dim > 0)
811 {
812 jvm_generate(p, 0, 1, "iconst_0");
813 jvm_generate(p, 2, 1, "aaload");
814 dim -= 1;
815 }
816 jvm_generate(p, 1, 1, "arraylength");
817 }
818
819 static void
820 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
821 {
822 jvm_generate_ldst_prepare(p, v);
823
824 int dim = 0;
825 oberon_type_t * base = arr;
826 while(base -> class == OBERON_TYPE_ARRAY)
827 {
828 if(base -> size == 0)
829 {
830 jvm_generate_load(p, v);
831 jvm_generate_array_len(p, dim);
832 dim += 1;
833 }
834 base = base -> base;
835 }
836
837 jvm_generate_new(p, arr, dim);
838 jvm_generate(p, 1, 2, "dup");
839 jvm_generate_load(p, v);
840 jvm_generate_copy_array(p, arr);
841 jvm_generate_store(p, v);
842 }
843
844 static void
845 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
846 {
847 jvm_generate_ldst_prepare(p, v);
848 jvm_generate_new(p, rec, 0);
849 jvm_generate(p, 1, 2, "dup");
850 jvm_generate_load(p, v);
851 jvm_generate_copy_record(p, rec);
852 jvm_generate_store(p, v);
853 }
854
855 static void
856 jvm_generate_local_object(gen_proc_t * p, oberon_object_t * x)
857 {
858 gen_var_t * v;
859 struct gen_class * class;
860
861 v = x -> gen_var;
862 class = p -> class;
863
864 // Убеждаемся что сейчас находимся в функции
865 assert(class -> p);
866 assert(x -> local);
867
868 switch(x -> class)
869 {
870 case OBERON_CLASS_VAR_PARAM:
871 case OBERON_CLASS_PARAM:
872 case OBERON_CLASS_VAR:
873 jvm_generate_var(v);
874 break;
875 case OBERON_CLASS_CONST:
876 case OBERON_CLASS_TYPE:
877 case OBERON_CLASS_PROC:
878 break;
879 default:
880 gen_error("jvm_generate_local_initialization: wat class %i", x -> class);
881 break;
882 }
883 }
884
885 static void
886 jvm_generate_local_initialization(gen_proc_t * p, oberon_object_t * x)
887 {
888 gen_var_t * v;
889 struct gen_class * class;
890
891 v = x -> gen_var;
892 class = p -> class;
893
894 // Убеждаемся что сейчас находимся в функции
895 assert(class -> p);
896 assert(x -> local);
897
898 switch(x -> class)
899 {
900 case OBERON_CLASS_VAR_PARAM:
901 case OBERON_CLASS_PARAM:
902 case OBERON_CLASS_VAR:
903 jvm_generate_var_initialization(p, v);
904 break;
905 case OBERON_CLASS_CONST:
906 case OBERON_CLASS_TYPE:
907 case OBERON_CLASS_PROC:
908 break;
909 default:
910 gen_error("jvm_generate_local_initialization: wat class %i", x -> class);
911 break;
912 }
913
914 if(x -> class == OBERON_CLASS_PARAM)
915 {
916 if(x -> type -> class == OBERON_TYPE_ARRAY)
917 {
918 jvm_generate_array_duplicate_and_replace(p, v, x -> type);
919 }
920 else if(x -> type -> class == OBERON_TYPE_RECORD)
921 {
922 jvm_generate_record_duplicate_and_replace(p, v, x -> type);
923 }
924 }
925 }
926
927 void
928 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
929 {
930 gen_proc_t * p;
931 char * name;
932 char * signature;
933 oberon_object_t * var;
934
935 p = proc -> gen_proc;
936
937 if(proc -> local)
938 {
939 signature = jvm_get_local_procedure_signature(proc);
940 }
941 else
942 {
943 oberon_generate_procedure_pointer_class(p -> class -> dir, proc);
944 signature = jvm_get_procedure_signature(proc -> type);
945 }
946
947 name = jvm_get_name(proc);
948 jvm_generate_function_header(p, "public static", name, signature);
949
950 if(proc -> local)
951 {
952 jvm_generate_staticlinks(proc);
953 }
954
955 jvm_generate_procedure_frame(proc);
956
957 /* Создание параметров и переменных */
958 var = proc -> scope -> list -> next;
959 while(var)
960 {
961 jvm_generate_local_object(p, var);
962 var = var -> next;
963 }
964
965 jvm_generate_frame_initialization(p);
966
967 /* Инициализация парамеров и переменных */
968 var = proc -> scope -> list -> next;
969 while(var)
970 {
971 jvm_generate_local_initialization(p, var);
972 var = var -> next;
973 }
974 }
975
976 void
977 oberon_generate_end_proc(oberon_context_t * ctx)
978 {
979 gen_module_t * m;
980 gen_proc_t * p;
981
982 m = ctx -> mod -> gen_mod;
983 p = m -> class -> p;
984
985 oberon_generate_trap(ctx, -4);
986 jvm_generate_function_end(p);
987 }
988
989 gen_label_t *
990 oberon_generator_reserve_label(oberon_context_t * ctx)
991 {
992 gen_module_t * m;
993 gen_proc_t * p;
994 gen_label_t * l;
995
996 m = ctx -> mod -> gen_mod;
997 p = m -> class -> p;
998
999 l = GC_MALLOC(sizeof *l);
1000 memset(l, 0, sizeof *l);
1001
1002 l -> id = jvm_new_label_id(p);
1003 return l;
1004 }
1005
1006 void
1007 oberon_generate_label(oberon_context_t * ctx, gen_label_t * l)
1008 {
1009 gen_module_t * m;
1010 gen_proc_t * p;
1011
1012 m = ctx -> mod -> gen_mod;
1013 p = m -> class -> p;
1014
1015 jvm_generate_label(p, l -> id);
1016 }
1017
1018 void
1019 oberon_generate_goto(oberon_context_t * ctx, gen_label_t * l)
1020 {
1021 gen_module_t * m;
1022 gen_proc_t * p;
1023
1024 m = ctx -> mod -> gen_mod;
1025 p = m -> class -> p;
1026
1027 jvm_generate(p, 0, 0, "goto L%i", l -> id);
1028 }
1029
1030 void
1031 oberon_generate_branch(oberon_context_t * ctx, oberon_expr_t * cond, bool gotoif, gen_label_t * l)
1032 {
1033 gen_module_t * m;
1034 gen_proc_t * p;
1035
1036 m = ctx -> mod -> gen_mod;
1037 p = m -> class -> p;
1038
1039 push_expr(p, cond);
1040
1041 if(gotoif == false)
1042 {
1043 /* переход если false */
1044 jvm_generate(p, 1, 0, "ifeq L%i", l -> id);
1045 }
1046 else
1047 {
1048 /* переход если true */
1049 jvm_generate(p, 1, 0, "ifne L%i", l -> id);
1050 }
1051 }
1052
1053 static void
1054 push_varptr(gen_proc_t * p, oberon_expr_t * expr)
1055 {
1056 assert(expr -> is_item);
1057
1058 switch(expr -> item.mode)
1059 {
1060 case MODE_VAR:
1061 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1062 break;
1063 case MODE_INDEX:
1064 push_item(p, expr -> item.parent);
1065 push_expr(p, expr -> item.args);
1066 break;
1067 case MODE_FIELD:
1068 push_item(p, expr -> item.parent);
1069 jvm_generate_ldst_prepare(p, expr -> item.var -> gen_var);
1070 break;
1071 case MODE_DEREF:
1072 push_varptr(p, (oberon_expr_t *) expr -> item.parent);
1073 break;
1074 default:
1075 gen_error("push_varptr: wat %i", expr -> item.mode);
1076 break;
1077 }
1078 }
1079
1080 static void
1081 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1082 {
1083 assert(desig -> var == NULL);
1084 assert(desig -> mode == MODE_CALL);
1085
1086 bool direct_call = false;
1087 if(desig -> parent -> mode == MODE_VAR)
1088 {
1089 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1090 {
1091 direct_call = true;
1092 }
1093 }
1094
1095 oberon_type_t * procsig;
1096 procsig = desig -> parent -> result;
1097
1098 if(direct_call == false)
1099 {
1100 /* Загружаем указатель на процедуру */
1101 push_item(p, desig -> parent);
1102 }
1103
1104 if(direct_call)
1105 {
1106 jvm_generate_push_static_links(p, desig -> parent -> var);
1107 }
1108
1109 int args_cells = 0;
1110 int result_cells = jvm_cell_size_for_type(procsig -> base);
1111
1112 int num = desig -> num_args;
1113 oberon_expr_t * arg = desig -> args;
1114 oberon_object_t * param = procsig -> decl;
1115 for(int i = 0; i < num; i++)
1116 {
1117 if(param -> class == OBERON_CLASS_VAR_PARAM)
1118 {
1119 args_cells += 2;
1120 push_varptr(p, arg);
1121 }
1122 else
1123 {
1124 args_cells += jvm_cell_size_for_type(arg -> result);
1125 push_expr(p, arg);
1126 }
1127 arg = arg -> next;
1128 param = param -> next;
1129 }
1130
1131 if(direct_call)
1132 {
1133 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1134 char * signature = jvm_get_local_procedure_signature(desig -> parent -> var);
1135 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1136 }
1137 else
1138 {
1139 char * cname = jvm_get_class_full_name(procsig);
1140 char * signature = jvm_get_procedure_signature(procsig);
1141 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1142 }
1143 }
1144
1145 void
1146 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1147 {
1148 assert(desig -> is_item);
1149 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1150 }
1151
1152 void
1153 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1154 {
1155 gen_module_t * m;
1156 gen_proc_t * p;
1157 char prefix;
1158 int cell_size;
1159
1160 m = ctx -> mod -> gen_mod;
1161 p = m -> class -> p;
1162
1163 if(expr)
1164 {
1165 push_expr(p, expr);
1166 prefix = jvm_get_prefix(expr -> result);
1167 cell_size = jvm_cell_size_for_type(expr -> result);
1168 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1169 }
1170 else
1171 {
1172 jvm_generate(p, 0, 0, "return");
1173 }
1174 }
1175
1176 static void
1177 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1178 {
1179 assert(type -> class == OBERON_TYPE_POINTER);
1180
1181 for(int i = 0; i < num; i++)
1182 {
1183 push_expr(p, arg);
1184 arg = arg -> next;
1185 }
1186
1187 jvm_generate_new(p, type -> base, num);
1188 }
1189
1190 static void
1191 jvm_generate_cast_prefix(gen_proc_t * p, char prefix, char postfix)
1192 {
1193 if(prefix == postfix)
1194 {
1195 return;
1196 }
1197
1198 int from_cell_size = jvm_cell_size_for_postfix(prefix);
1199 int to_cell_size = jvm_cell_size_for_postfix(postfix);
1200 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1201 }
1202
1203 static void
1204 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1205 {
1206 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1207 {
1208 if(to -> class == OBERON_TYPE_POINTER && to -> base -> class == OBERON_TYPE_RECORD)
1209 {
1210 char * full_name = jvm_get_class_full_name(to);
1211 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1212 }
1213 }
1214 else
1215 {
1216 char prefix = jvm_get_prefix(from);
1217 char postfix = jvm_get_postfix(to);
1218 jvm_generate_cast_prefix(p, prefix, postfix);
1219 }
1220 }
1221
1222 static void
1223 jvm_generate_hard_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1224 {
1225 if(from -> class == OBERON_TYPE_REAL
1226 && (to -> class == OBERON_TYPE_INTEGER || to -> class == OBERON_TYPE_SYSTEM_BYTE))
1227 {
1228 char postfix = jvm_get_postfix(to);
1229 if(from -> size <= 4)
1230 {
1231 jvm_generate(p, 1, 1, "invokestatic java/lang/Float/floatToIntBits(F)I");
1232 jvm_generate_cast_prefix(p, 'i', postfix);
1233 }
1234 else
1235 {
1236 jvm_generate(p, 2, 2, "invokestatic java/lang/Double/doubleToIntBits(D)J");
1237 jvm_generate_cast_prefix(p, 'l', postfix);
1238 }
1239 }
1240 else if((from -> class == OBERON_TYPE_INTEGER || from -> class == OBERON_TYPE_SYSTEM_BYTE)
1241 && to -> class == OBERON_TYPE_REAL)
1242 {
1243 char prefix = jvm_get_prefix(from);
1244 if(to -> size <= 4)
1245 {
1246 jvm_generate_cast_prefix(p, prefix, 'i');
1247 jvm_generate(p, 1, 1, "invokestatic java/lang/Float/intBitsToFloat(I)F");
1248 }
1249 else
1250 {
1251 jvm_generate_cast_prefix(p, prefix, 'l');
1252 jvm_generate(p, 2, 2, "invokestatic java/lang/Double/longBitsToDouble(J)D");
1253 }
1254 }
1255 else
1256 {
1257 jvm_generate_cast_type(p, from, to);
1258 }
1259 }
1260
1261 static void
1262 push_item(gen_proc_t * p, oberon_item_t * item)
1263 {
1264 switch(item -> mode)
1265 {
1266 case MODE_VAR:
1267 if(item -> var -> class == OBERON_CLASS_PROC)
1268 {
1269 jvm_generate_push_procedure_pointer(p, item -> var);
1270 }
1271 else
1272 {
1273 jvm_generate_load(p, item -> var -> gen_var);
1274 }
1275 break;
1276 case MODE_INTEGER:
1277 case MODE_BOOLEAN:
1278 case MODE_CHAR:
1279 case MODE_SET:
1280 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1281 break;
1282 case MODE_CALL:
1283 jvm_generate_call_proc(p, item);
1284 break;
1285 case MODE_INDEX:
1286 ;
1287 char postfix = jvm_get_postfix(item -> result);
1288 int cell_size = jvm_cell_size_for_postfix(postfix);
1289 push_item(p, item -> parent);
1290 push_expr(p, item -> args);
1291 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1292 break;
1293 case MODE_FIELD:
1294 push_item(p, item -> parent);
1295 jvm_generate_load(p, item -> var -> gen_var);
1296 break;
1297 case MODE_DEREF:
1298 /* Все объекты в jvm представляются как указатели */
1299 push_item(p, item -> parent);
1300 break;
1301 case MODE_NIL:
1302 jvm_generate(p, 0, 1, "aconst_null");
1303 break;
1304 case MODE_NEW:
1305 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1306 break;
1307 case MODE_REAL:
1308 jvm_generate_push_float(p, item -> real, item -> result -> size);
1309 break;
1310 case MODE_STRING:
1311 jvm_generate_push_string(p, item -> string, item -> result -> size);
1312 break;
1313 case MODE_LEN:
1314 push_item(p, item -> parent);
1315 jvm_generate_array_len(p, item -> integer);
1316 jvm_generate_cast_prefix(p, 'i', jvm_get_postfix(item -> result));
1317 break;
1318 default:
1319 gen_error("push_item: unk mode %i", item -> mode);
1320 break;
1321 }
1322 }
1323
1324 static void
1325 jvm_generate_logical_not(gen_proc_t * p)
1326 {
1327 int label_done = jvm_new_label_id(p);
1328 int label_false = jvm_new_label_id(p);
1329
1330 jvm_generate(p, 1, 0, "ifne L%i", label_false);
1331 jvm_generate(p, 0, 1, "iconst_1");
1332 jvm_generate(p, 0, 0, "goto L%i", label_done);
1333 jvm_generate_label(p, label_false);
1334 jvm_generate(p, 0, 1, "iconst_0");
1335 jvm_generate_label(p, label_done);
1336 }
1337
1338 static void
1339 jvm_generate_abs(gen_proc_t * p, char prefix)
1340 {
1341 char t = jvm_get_type_of_prefix(prefix);
1342 int cell_size = jvm_cell_size_for_postfix(prefix);
1343 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1344 }
1345
1346 static char *
1347 jvm_get_compare_postfix(int op)
1348 {
1349 char * cmpop = "";
1350 switch(op)
1351 {
1352 case OP_EQ:
1353 cmpop = "eq";
1354 break;
1355 case OP_NEQ:
1356 cmpop = "ne";
1357 break;
1358 case OP_LSS:
1359 cmpop = "lt";
1360 break;
1361 case OP_LEQ:
1362 cmpop = "le";
1363 break;
1364 case OP_GRT:
1365 cmpop = "gt";
1366 break;
1367 case OP_GEQ:
1368 cmpop = "ge";
1369 break;
1370 default:
1371 gen_error("jvm_generate_compare_op: wat");
1372 break;
1373 }
1374 return cmpop;
1375 }
1376
1377 static void
1378 jvm_generate_compare_op(gen_proc_t * p, oberon_type_t * t, int op)
1379 {
1380 char prefix = jvm_get_prefix(t);
1381 int label_true = jvm_new_label_id(p);
1382 int label_done = jvm_new_label_id(p);
1383 int cell_size = jvm_cell_size_for_type(t);
1384 char * cmpop = jvm_get_compare_postfix(op);
1385
1386 if(prefix == 'l')
1387 {
1388 jvm_generate(p, 2 * cell_size, 1, "lcmp");
1389 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1390 }
1391 else if(prefix == 'f' || prefix == 'd')
1392 {
1393 char fop;
1394 if(op == OP_EQ || op == OP_NEQ || op == OP_GRT || op == OP_GEQ)
1395 {
1396 fop = 'l';
1397 }
1398 else
1399 {
1400 fop = 'g';
1401 }
1402 jvm_generate(p, 2 * cell_size, 1, "%ccmp%c", prefix, fop);
1403 jvm_generate(p, 1, 1, "if%s L%i", cmpop, label_true);
1404 }
1405 else if(prefix == 'a')
1406 {
1407 if(t -> class == OBERON_TYPE_STRING
1408 || (t -> class == OBERON_TYPE_POINTER && t -> base -> class == OBERON_TYPE_CHAR))
1409 {
1410 jvm_generate(p, 2, 1, "invokestatic SYSTEM/STRCMP([B[B)I");
1411 jvm_generate(p, 1, 0, "if%s L%i", cmpop, label_true);
1412 }
1413 else
1414 {
1415 jvm_generate(p, 1, 0, "if_acmp%s L%i", cmpop, label_true);
1416 }
1417 }
1418 else
1419 {
1420 jvm_generate(p, 2 * cell_size, 0, "if_%ccmp%s L%i", prefix, cmpop, label_true);
1421 }
1422
1423 jvm_generate(p, 0, 1, "iconst_0");
1424 jvm_generate(p, 0, 0, "goto L%i", label_done);
1425 jvm_generate_label(p, label_true);
1426 jvm_generate(p, 0, 1, "iconst_1");
1427 jvm_generate_label(p, label_done);
1428 }
1429
1430 static void
1431 jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
1432 {
1433 char prefix = jvm_get_prefix(t);
1434 int cell_size = jvm_cell_size_for_type(t);
1435 switch(op)
1436 {
1437 case OP_UNARY_MINUS:
1438 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1439 break;
1440 case OP_COMPLEMENTATION:
1441 jvm_generate_push_int_size(p, -1, t -> size);
1442 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1443 break;
1444 case OP_LOGIC_NOT:
1445 jvm_generate_logical_not(p);
1446 break;
1447 case OP_ABS:
1448 jvm_generate_abs(p, prefix);
1449 break;
1450 case OP_CAP:
1451 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Character/toUpperCase(I)I");
1452 break;
1453
1454 case OP_ADD:
1455 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1456 break;
1457 case OP_SUB:
1458 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1459 break;
1460 case OP_MUL:
1461 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1462 break;
1463 case OP_DIV:
1464 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1465 break;
1466 case OP_MOD:
1467 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1468 break;
1469 case OP_UNION:
1470 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1471 break;
1472 case OP_INTERSECTION:
1473 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1474 break;
1475 case OP_DIFFERENCE:
1476 /* (a - b) == a & ~b */
1477 jvm_generate_push_int_size(p, -1, t -> size);
1478 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1479 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1480 break;
1481 case OP_SYM_DIFFERENCE:
1482 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1483 break;
1484
1485 case OP_EQ:
1486 case OP_NEQ:
1487 case OP_LSS:
1488 case OP_LEQ:
1489 case OP_GRT:
1490 case OP_GEQ:
1491 jvm_generate_compare_op(p, t, op);
1492 break;
1493 default:
1494 gen_error("jvm_generate_operator: unk op %i", op);
1495 break;
1496 }
1497 }
1498
1499 static void
1500 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1501 {
1502 int label_calc_b = jvm_new_label_id(p);
1503 int label_done = jvm_new_label_id(p);
1504
1505 /* a OR b -- если a, то TRUE, иначе b */
1506
1507 push_expr(p, a);
1508 jvm_generate(p, 1, 0, "ifeq L%i", label_calc_b);
1509 jvm_generate(p, 0, 1, "iconst_1");
1510 jvm_generate(p, 0, 0, "goto L%i", label_done);
1511 jvm_generate_label(p, label_calc_b);
1512 push_expr(p, b);
1513 jvm_generate_label(p, label_done);
1514 }
1515
1516 static void
1517 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1518 {
1519 int label_false = jvm_new_label_id(p);
1520 int label_done = jvm_new_label_id(p);
1521
1522 /* a AND b -- если a, то b, иначе FALSE */
1523
1524 push_expr(p, a);
1525 jvm_generate(p, 1, 0, "ifeq L%i", label_false);
1526 push_expr(p, b);
1527 jvm_generate(p, 0, 0, "goto L%i", label_done);
1528 jvm_generate_label(p, label_false);
1529 jvm_generate(p, 0, 1, "iconst_0");
1530 jvm_generate_label(p, label_done);
1531 }
1532
1533 static void
1534 jvm_generate_range(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1535 {
1536 /* { a } == 1 << a */
1537 /* { a..b } == (a <= b) ? ((2 << b) - (1 << a)) : (0); */
1538
1539 char prefix;
1540 int cell_size;
1541 oberon_type_t * type;
1542 gen_var_t * ra;
1543 gen_var_t * rb;
1544 int label_else;
1545 int label_end;
1546
1547 type = a -> result;
1548 cell_size = jvm_cell_size_for_type(type);
1549 prefix = jvm_get_prefix(type);
1550
1551 if(b == NULL)
1552 {
1553 jvm_generate_push_int_size(p, 1, type -> size);
1554 push_expr(p, a);
1555 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1556 }
1557 else
1558 {
1559 ra = jvm_create_function_temp_var(p, type -> gen_type);
1560 rb = jvm_create_function_temp_var(p, type -> gen_type);
1561 jvm_generate_var(ra);
1562 jvm_generate_var(rb);
1563 jvm_generate_var_initialization(p, ra);
1564 jvm_generate_var_initialization(p, rb);
1565 label_else = jvm_new_label_id(p);
1566 label_end = jvm_new_label_id(p);
1567
1568 push_expr(p, a);
1569 jvm_generate_store(p, ra);
1570 push_expr(p, b);
1571 jvm_generate_store(p, rb);
1572
1573 jvm_generate_load(p, ra);
1574 jvm_generate_load(p, rb);
1575 jvm_generate(p, 2 * cell_size, 0, "if_%ccmpgt L%i", prefix, label_else);
1576
1577 jvm_generate_push_int_size(p, 2, type -> size);
1578 jvm_generate_load(p, rb);
1579 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1580 jvm_generate_push_int_size(p, 2, type -> size);
1581 jvm_generate_load(p, ra);
1582 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1583 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1584 jvm_generate(p, 0, 0, "goto L%i", label_end);
1585
1586 jvm_generate_label(p, label_else);
1587 jvm_generate_push_int_size(p, 0, type -> size);
1588 jvm_generate_label(p, label_end);
1589 }
1590
1591 /* TODO free registers */
1592 }
1593
1594 static void
1595 jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1596 {
1597 oberon_type_t * t = a -> result;
1598 int cell_size = jvm_cell_size_for_type(t);
1599 char prefix = jvm_get_prefix(t);
1600 int label_else = jvm_new_label_id(p);
1601 int label_end = jvm_new_label_id(p);
1602
1603 /* (a IN b) == (1 << a) & b */
1604 jvm_generate_push_int_size(p, 1, t -> size);
1605 push_expr(p, a);
1606 jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);
1607 push_expr(p, b);
1608 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1609
1610 if(cell_size > 1)
1611 {
1612 jvm_generate(p, cell_size, 0, "lcmp");
1613 }
1614
1615 jvm_generate(p, 1, 0, "ifeq L%i", label_else);
1616 jvm_generate(p, 0, 1, "iconst_1");
1617 jvm_generate(p, 0, 0, "goto L%i", label_end);
1618 jvm_generate_label(p, label_else);
1619 jvm_generate(p, 0, 1, "iconst_0");
1620 jvm_generate_label(p, label_end);
1621 }
1622
1623 static void
1624 jvm_generate_shift(gen_proc_t * p, int op, oberon_expr_t * a, oberon_expr_t * b)
1625 {
1626 oberon_type_t * t = a -> result;
1627 int cell_size = jvm_cell_size_for_type(t);
1628 char prefix = jvm_get_prefix(t);
1629 char dt = jvm_get_type_of_prefix(prefix);
1630
1631 push_expr(p, a);
1632 jvm_generate_cast_type(p, a -> result, t);
1633 push_expr(p, b);
1634 jvm_generate_cast_type(p, b -> result, t);
1635
1636 char * opname;
1637 switch(op)
1638 {
1639 case OP_ASH:
1640 opname = "ASH";
1641 break;
1642 case OP_LSH:
1643 opname = "LSH";
1644 break;
1645 case OP_ROT:
1646 opname = "ROT";
1647 break;
1648 default:
1649 gen_error("jvm_generate_shift: invalid op %i", op);
1650 }
1651
1652 jvm_generate(p, 2 * cell_size, cell_size, "invokestatic SYSTEM/%s(%c%c)%c", opname, dt, dt, dt);
1653 }
1654
1655 static void
1656 jvm_generate_entier(gen_proc_t * p, oberon_expr_t * x, oberon_type_t * res)
1657 {
1658 char prefix = jvm_get_prefix(x -> result);
1659 char postfix = jvm_get_postfix(res);
1660
1661 push_expr(p, x);
1662 jvm_generate_cast_prefix(p, prefix, 'd');
1663 jvm_generate(p, 2, 2, "invokestatic java/lang/Math/floor(D)D");
1664 jvm_generate_cast_prefix(p, 'd', postfix);
1665 }
1666
1667 static void
1668 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1669 {
1670 oberon_type_t * preq = oper -> left -> result;
1671 int op = oper -> op;
1672 switch(op)
1673 {
1674 case OP_CAST:
1675 push_expr(p, oper -> left);
1676 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1677 break;
1678 case OP_HARDCAST:
1679 push_expr(p, oper -> left);
1680 jvm_generate_hard_cast_type(p, oper -> left -> result, oper -> result);
1681 break;
1682 case OP_COMPLEMENTATION:
1683 case OP_UNARY_MINUS:
1684 case OP_LOGIC_NOT:
1685 case OP_ABS:
1686 case OP_CAP:
1687 push_expr(p, oper -> left);
1688 jvm_generate_operator(p, preq, op);
1689 break;
1690 case OP_ENTIER:
1691 jvm_generate_entier(p, oper -> left, oper -> result);
1692 break;
1693
1694 case OP_ADD:
1695 case OP_SUB:
1696 case OP_MUL:
1697 case OP_DIV:
1698 case OP_MOD:
1699
1700 case OP_UNION:
1701 case OP_INTERSECTION:
1702 case OP_DIFFERENCE:
1703 case OP_SYM_DIFFERENCE:
1704
1705 case OP_EQ:
1706 case OP_NEQ:
1707 case OP_LSS:
1708 case OP_LEQ:
1709 case OP_GRT:
1710 case OP_GEQ:
1711 push_expr(p, oper -> left);
1712 push_expr(p, oper -> right);
1713 jvm_generate_operator(p, preq, op);
1714 break;
1715
1716 case OP_LOGIC_OR:
1717 jvm_generate_logical_or(p, oper -> left, oper -> right);
1718 break;
1719 case OP_LOGIC_AND:
1720 jvm_generate_logical_and(p, oper -> left, oper -> right);
1721 break;
1722
1723 case OP_IS:
1724 preq = oper -> right -> result;
1725 char * cname = jvm_get_class_full_name(preq);
1726 push_expr(p, oper -> left);
1727 jvm_generate(p, 1, 1, "instanceof %s", cname);
1728 break;
1729 case OP_RANGE:
1730 jvm_generate_range(p, oper -> left, oper -> right);
1731 break;
1732 case OP_IN:
1733 jvm_generate_in(p, oper -> left, oper -> right);
1734 break;
1735
1736 case OP_ASH:
1737 case OP_LSH:
1738 case OP_ROT:
1739 jvm_generate_shift(p, op, oper -> left, oper -> right);
1740 break;
1741 default:
1742 gen_error("push_oper: unk op %i", op);
1743 break;
1744 }
1745 }
1746
1747 static void
1748 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1749 {
1750 if(expr -> is_item)
1751 {
1752 push_item(p, (oberon_item_t *) expr);
1753 }
1754 else
1755 {
1756 push_operator(p, (oberon_oper_t *) expr);
1757 }
1758 }
1759
1760 static void
1761 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1762 {
1763 assert(dst -> is_item);
1764 oberon_item_t * item = (oberon_item_t *) dst;
1765
1766 if(dst -> result -> class == OBERON_TYPE_ARRAY
1767 || src -> result -> class == OBERON_TYPE_ARRAY)
1768 {
1769 push_expr(p, dst);
1770 push_expr(p, src);
1771 jvm_generate_copy_array(p, dst -> result);
1772 }
1773 else if(dst -> result -> class == OBERON_TYPE_RECORD
1774 || src -> result -> class == OBERON_TYPE_RECORD)
1775 {
1776 push_expr(p, dst);
1777 push_expr(p, src);
1778 jvm_generate_copy_record(p, dst -> result);
1779 }
1780 else switch(item -> mode)
1781 {
1782 case MODE_VAR:
1783 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1784 push_expr(p, src);
1785 jvm_generate_store(p, item -> var -> gen_var);
1786 break;
1787 case MODE_INDEX:
1788 ;
1789 char postfix = jvm_get_postfix(src -> result);
1790 int cell_size = jvm_cell_size_for_postfix(postfix);
1791 assert(item -> parent -> is_item);
1792 push_item(p, (oberon_item_t *) item -> parent);
1793 push_expr(p, item -> args);
1794 push_expr(p, src);
1795 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1796 break;
1797 case MODE_FIELD:
1798 assert(item -> parent -> is_item);
1799 push_item(p, (oberon_item_t *) item -> parent);
1800 jvm_generate_ldst_prepare(p, item -> var -> gen_var);
1801 push_expr(p, src);
1802 jvm_generate_store(p, item -> var -> gen_var);
1803 break;
1804 default:
1805 gen_error("store_expr: unk mode %i", item -> mode);
1806 break;
1807 }
1808 }
1809
1810 void
1811 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1812 {
1813 gen_module_t * m;
1814 gen_proc_t * p;
1815
1816 m = ctx -> mod -> gen_mod;
1817 p = m -> class -> p;
1818
1819 store_expr(p, dst, src);
1820 }
1821
1822 void
1823 oberon_generate_copy(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1824 {
1825 gen_module_t * m;
1826 gen_proc_t * p;
1827 char * desc;
1828
1829 m = ctx -> mod -> gen_mod;
1830 p = m -> class -> p;
1831
1832 push_expr(p, src);
1833 push_expr(p, dst);
1834
1835 desc = jvm_get_descriptor(dst -> result);
1836
1837 jvm_generate(p, 2, 0, "invokestatic SYSTEM/COPY(%s%s)V", desc, desc);
1838 }
1839
1840 void
1841 oberon_generate_assert(oberon_context_t * ctx, oberon_expr_t * cond)
1842 {
1843 gen_module_t * m;
1844 gen_proc_t * p;
1845
1846 m = ctx -> mod -> gen_mod;
1847 p = m -> class -> p;
1848
1849 push_expr(p, cond);
1850 jvm_generate(p, 1, 0, "invokestatic SYSTEM/ASSERT(Z)V");
1851 }
1852
1853 void
1854 oberon_generate_assert_n(oberon_context_t * ctx, oberon_expr_t * cond, int64_t n)
1855 {
1856 gen_module_t * m;
1857 gen_proc_t * p;
1858
1859 m = ctx -> mod -> gen_mod;
1860 p = m -> class -> p;
1861
1862 push_expr(p, cond);
1863 jvm_generate_push_int_size(p, n, 8);
1864 jvm_generate(p, 1 + 2, 0, "invokestatic SYSTEM/ASSERT(ZJ)V");
1865 }
1866
1867 void
1868 oberon_generate_trap(oberon_context_t * ctx, int64_t n)
1869 {
1870 gen_module_t * m;
1871 gen_proc_t * p;
1872
1873 m = ctx -> mod -> gen_mod;
1874 p = m -> class -> p;
1875
1876 jvm_generate_push_int_size(p, n, 8);
1877 jvm_generate(p, 2, 0, "invokestatic SYSTEM/TRAP(J)V");
1878 }
1879
1880 void
1881 oberon_generate_halt(oberon_context_t * ctx, int64_t n)
1882 {
1883 gen_module_t * m;
1884 gen_proc_t * p;
1885
1886 m = ctx -> mod -> gen_mod;
1887 p = m -> class -> p;
1888
1889 jvm_generate_push_int_size(p, n, 8);
1890 jvm_generate(p, 2, 0, "invokestatic SYSTEM/HALT(J)V");
1891 }
1892
1893 void
1894 oberon_set_out_directory(oberon_context_t * ctx, const char * path)
1895 {
1896 gen_context_t * c;
1897
1898 c = ctx -> gen_context;
1899
1900 c -> dir = new_string(path);
1901 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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