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Теперь возможен вызов процедур-переменных из полей записей
[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-basic.h"
15
16 // ==========================================
17 // ==========================================
18 // ==========================================
19
20 gen_proc_t *
21 jvm_create_proc(struct gen_class * class)
22 {
23 gen_proc_t * p = GC_MALLOC(sizeof *p);
24 memset(p, 0, sizeof *p);
25
26 struct gen_register_file * rf = GC_MALLOC(sizeof *rf);
27 memset(rf, 0, sizeof *rf);
28
29 struct gen_stack * stack = GC_MALLOC(sizeof *stack);
30 memset(rf, 0, sizeof *stack);
31
32 p -> rf = rf;
33 p -> stack = stack;
34 p -> class = class;
35 p -> label_id = 0;
36
37 return p;
38 }
39
40 void
41 jvm_generate_function_header(gen_proc_t * p, char * access, char * name, char * signature)
42 {
43 struct gen_class * class;
44 class = p -> class;
45
46 /* Делаем процедуру текущей в этом классе */
47 assert(class -> p == NULL);
48 class -> p = p;
49
50 fprintf(class -> fp, ".method %s %s%s\n", access, name, signature);
51 fprintf(class -> fp, " start:\n");
52 }
53
54 void
55 jvm_generate_function_end(gen_proc_t * p)
56 {
57 struct gen_class * class;
58 class = p -> class;
59
60 assert(class -> p);
61 class -> p = NULL;
62
63 int pointer = p -> stack -> pointer;
64 int max_pointer = p -> stack -> max_pointer;
65 int locals = p -> rf -> num_used;
66 int max_locals = p -> rf -> max_used;
67
68 fprintf(class -> fp, " .limit stack %i \t; current(%i)\n", max_pointer, pointer);
69 fprintf(class -> fp, " .limit locals %i \t; current(%i)\n", max_locals, locals);
70 fprintf(class -> fp, " end:\n");
71 fprintf(class -> fp, ".end method\n\n");
72 }
73
74 struct gen_class *
75 jvm_create_class(char * full_name)
76 {
77 struct gen_class * class = GC_MALLOC(sizeof *class);
78 memset(class, 0, sizeof *class);
79
80 char * fname = new_string("%s.j", full_name);
81 class -> full_name = new_string(full_name);
82 class -> fp = fopen(fname, "w");
83 assert(class -> fp);
84
85 return class;
86 }
87
88 static void
89 jvm_destroy_class(struct gen_class * class)
90 {
91 assert(class -> p == NULL);
92 fclose(class -> fp);
93 }
94
95 static void
96 jvm_stack_push(gen_proc_t * p, unsigned size)
97 {
98 p -> stack -> pointer += size;
99 if(p -> stack -> pointer > p -> stack -> max_pointer)
100 {
101 p -> stack -> max_pointer = p -> stack -> pointer;
102 }
103 }
104
105 static void
106 jvm_stack_pop(gen_proc_t * p, unsigned size)
107 {
108 p -> stack -> pointer -= size;
109
110 if(p -> stack -> pointer < 0)
111 {
112 printf("WARING: stack pointer %i\n", p -> stack -> pointer);
113 }
114 }
115
116 static void
117 jvm_generate(gen_proc_t * p, unsigned get, unsigned push, char * format, ...)
118 {
119 va_list ptr;
120 va_start(ptr, format);
121
122 jvm_stack_pop(p, get);
123 fprintf(p -> class -> fp, " ");
124 vfprintf(p -> class -> fp, format, ptr);
125 jvm_stack_push(p, push);
126 fprintf(p -> class -> fp, " \t ;>>>> %i -- %i : current_stack(%i)\n", get, push, p -> stack -> pointer);
127
128 va_end(ptr);
129 }
130
131 static void
132 jvm_generate_comment(gen_proc_t * p, char * format, ...)
133 {
134 va_list ptr;
135 va_start(ptr, format);
136
137 fprintf(p -> class -> fp, " ;;;; ");
138 vfprintf(p -> class -> fp, format, ptr);
139 fprintf(p -> class -> fp, "\n");
140
141 va_end(ptr);
142 }
143
144 static void
145 jvm_generate_push_int(gen_proc_t * p, int64_t i)
146 {
147 if(i == -1)
148 {
149 jvm_generate(p, 0, 1, "iconst_m1");
150 }
151 else if(i >= 0 && i <= 5)
152 {
153 jvm_generate(p, 0, 1, "iconst_%li", i);
154 }
155 else if(i >= -128 && i <= 127)
156 {
157 jvm_generate(p, 0, 1, "bipush %li", i);
158 }
159 else if(i >= -32768 && i <= 32767)
160 {
161 jvm_generate(p, 0, 1, "sipush %li", i);
162 }
163 else if(i >= -2147483648 && i <= 2147483647)
164 {
165 jvm_generate(p, 0, 1, "ldc %li", i);
166 }
167 else
168 {
169 jvm_generate(p, 0, 2, "ldc2_w %li", i);
170 }
171 }
172
173 static void
174 jvm_generate_push_int_size(gen_proc_t * p, int64_t i, int size)
175 {
176 int pushed_cell = 1;
177
178 if(i == -1)
179 {
180 jvm_generate(p, 0, 1, "iconst_m1");
181 }
182 else if(i >= 0 && i <= 5)
183 {
184 jvm_generate(p, 0, 1, "iconst_%li", i);
185 }
186 else if(i >= -128 && i <= 127)
187 {
188 jvm_generate(p, 0, 1, "bipush %li", i);
189 }
190 else if(i >= -32768 && i <= 32767)
191 {
192 jvm_generate(p, 0, 1, "sipush %li", i);
193 }
194 else if(i >= -2147483648 && i <= 2147483647)
195 {
196 jvm_generate(p, 0, 1, "ldc %li", i);
197 }
198 else
199 {
200 pushed_cell = 2;
201 jvm_generate(p, 0, 2, "ldc2_w %li", i);
202 }
203
204 assert(size <= 8);
205 if(size > 4 && pushed_cell == 1)
206 {
207 jvm_generate(p, pushed_cell, 2, "i2l");
208 }
209 else if(size <= 4)
210 {
211 if(pushed_cell > 1)
212 {
213 jvm_generate(p, 2, 1, "l2i");
214 }
215
216 if(size == 2)
217 {
218 jvm_generate(p, 1, 1, "i2s");
219 }
220 else if(size == 1)
221 {
222 jvm_generate(p, 1, 1, "i2b");
223 }
224 }
225 }
226
227 static void
228 jvm_generate_push_float(gen_proc_t * p, double f, int size)
229 {
230 if(size <= 4)
231 {
232 if(f == 0.0)
233 {
234 jvm_generate(p, 0, 1, "fconst_0");
235 }
236 if(f == 1.0)
237 {
238 jvm_generate(p, 0, 1, "fconst_1");
239 }
240 if(f == 2.0)
241 {
242 jvm_generate(p, 0, 1, "fconst_2");
243 }
244 else
245 {
246 jvm_generate(p, 0, 1, "ldc %lf", f);
247 }
248 }
249 else
250 {
251 if(f == 0.0)
252 {
253 jvm_generate(p, 0, 2, "dconst_0");
254 }
255 if(f == 1.0)
256 {
257 jvm_generate(p, 0, 2, "dconst_1");
258 }
259 else
260 {
261 jvm_generate(p, 0, 2, "ldc2_w %lf", f);
262 }
263 }
264 }
265
266 static gen_var_t *
267 oberon_generator_new_var()
268 {
269 gen_var_t * v = GC_MALLOC(sizeof *v);
270 memset(v, 0, sizeof *v);
271 return v;
272 }
273
274 static void
275 jvm_generate_and_init_global_var(gen_var_t * v, struct gen_class * class, char * access, char * name, char * desc)
276 {
277 assert(class -> p == NULL);
278 fprintf(class -> fp, ".field %s static %s %s\n\n", access, name, desc);
279
280 v -> storage = JVM_STORAGE_STATIC;
281 v -> full_name = new_string("%s/%s", class -> full_name, name);
282 v -> desc = new_string(desc);
283 }
284
285 static void
286 jvm_generate_and_init_field(gen_var_t * v, struct gen_class * class, char * access, char * name, char * desc)
287 {
288 assert(class -> p == NULL);
289 fprintf(class -> fp, ".field %s %s %s\n\n", access, name, desc);
290
291 v -> storage = JVM_STORAGE_FIELD;
292 v -> full_name = new_string("%s/%s", class -> full_name, name);
293 v -> desc = new_string(desc);
294 }
295
296 static void
297 jvm_generate_and_init_local_var(gen_var_t * v, gen_proc_t * p, bool wide)
298 {
299 v -> storage = JVM_STORAGE_REGISTER;
300 v -> reg = jvm_alloc_register_untyped(p -> rf, wide);
301 }
302
303 static void
304 jvm_generate_and_init_named_local_var(gen_var_t * v, gen_proc_t * p, bool wide, char * name, char * desc)
305 {
306 jvm_generate_and_init_local_var(v, p, wide);
307 v -> desc = new_string(desc);
308 jvm_generate(p, 0, 0, ".var %i is %s %s from start to end", v -> reg, name, desc);
309 }
310
311 static int
312 jvm_new_label_id(gen_proc_t * p)
313 {
314 int label_id = p -> label_id;
315 p -> label_id += 1;
316 return label_id;
317 }
318
319 static char *
320 jvm_get_label_name(int label_id)
321 {
322 return new_string("L%i", label_id);
323 }
324
325 static void
326 jvm_generate_label(gen_proc_t * p, int label_id)
327 {
328 jvm_generate(p, 0, 0, "L%i:", label_id);
329 }
330
331 static void
332 jvm_generate_load(gen_proc_t * p, oberon_type_t * src_type, gen_var_t * src)
333 {
334 char prefix;
335 int cell_size;
336
337 cell_size = jvm_cell_size_for_type(src_type);
338
339 switch(src -> storage)
340 {
341 case JVM_STORAGE_REGISTER:
342 prefix = jvm_get_prefix(src_type);
343 jvm_generate(p, 0, cell_size, "%cload %i", prefix, src -> reg);
344 break;
345 case JVM_STORAGE_STATIC:
346 jvm_generate(p, 0, cell_size, "getstatic %s %s", src -> full_name, src -> desc);
347 break;
348 case JVM_STORAGE_FIELD:
349 jvm_generate(p, 1, cell_size, "getfield %s %s", src -> full_name, src -> desc);
350 break;
351 default:
352 gen_error("jvm_generate_load: unknow storage type %i", src -> storage);
353 break;
354 }
355 }
356
357 static void
358 jvm_generate_store(gen_proc_t * p, oberon_type_t * src_type, gen_var_t * dst)
359 {
360 char prefix;
361 int cell_size;
362
363 cell_size = jvm_cell_size_for_type(src_type);
364
365 switch(dst -> storage)
366 {
367 case JVM_STORAGE_REGISTER:
368 prefix = jvm_get_prefix(src_type);
369 jvm_generate(p, cell_size, 0, "%cstore %i", prefix, dst -> reg);
370 break;
371 case JVM_STORAGE_STATIC:
372 jvm_generate(p, cell_size, 0, "putstatic %s %s", dst -> full_name, dst -> desc);
373 break;
374 case JVM_STORAGE_FIELD:
375 jvm_generate(p, 1 + cell_size, 0, "putfield %s %s", dst -> full_name, dst -> desc);
376 break;
377 default:
378 gen_error("jvm_generate_store: unknow storage type %i", dst -> storage);
379 break;
380 }
381 }
382
383 static void
384 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num);
385
386 /*
387 * Генерирует код для инициализации массива со статическим базовым типом
388 * ( aref -- )
389 */
390
391 static void
392 jvm_generate_array_initialization(gen_proc_t * p, oberon_type_t * arr)
393 {
394 int dim = 0;
395 oberon_type_t * base = arr;
396 while(base -> class == OBERON_TYPE_ARRAY)
397 {
398 dim += 1;
399 base = base -> base;
400 }
401
402 if(base -> class != OBERON_TYPE_RECORD)
403 {
404 jvm_generate(p, 1, 0, "pop");
405 return;
406 }
407
408 struct {
409 gen_var_t * index;
410 gen_var_t * length;
411 int start;
412 int end;
413 } loop[dim];
414
415 gen_var_t * dst = oberon_generator_new_var();
416 jvm_generate_and_init_local_var(dst, p, false);
417 jvm_generate_store(p, arr, dst);
418
419 /*
420 * Входящие параметры заграблены.
421 * Теперь генерируем эквивалентный код:
422 * int i = 0;
423 * int len = dst.length
424 * while(i < len)
425 * {
426 * ...
427 * {
428 * dst[i, ...] = new record;
429 * }
430 * ...
431 * i += 1;
432 * }
433 * Где "..." такой же код (начало и конец) для следующей размерности.
434 */
435
436 for(int i = 0; i < dim; i++)
437 {
438 loop[i].index = oberon_generator_new_var();
439 loop[i].length = oberon_generator_new_var();
440 loop[i].start = jvm_new_label_id(p);
441 loop[i].end = jvm_new_label_id(p);
442 jvm_generate_and_init_local_var(loop[i].index, p, false);
443 jvm_generate_and_init_local_var(loop[i].length, p, false);
444
445 /* TODO преределать через jvm_generate_load{{store}} */
446
447 jvm_generate(p, 0, 1, "iconst_0");
448 jvm_generate(p, 1, 0, "istore %i", loop[i].index -> reg);
449
450 jvm_generate_load(p, arr, dst);
451 jvm_generate(p, 1, 1, "arraylength");
452 jvm_generate(p, 1, 0, "istore %i", loop[i].length -> reg);
453
454 /* if(i >= len) goto end; */
455 jvm_generate_label(p, loop[i].start);
456 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
457 jvm_generate(p, 0, 1, "iload %i", loop[i].length -> reg);
458 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
459 }
460
461 jvm_generate_load(p, arr, dst);
462 jvm_generate(p, 0, 1, "iload %i", loop[0].index -> reg);
463 for(int i = 1; i < dim; i++)
464 {
465 jvm_generate(p, 2, 1, "aaload");
466 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
467 }
468 jvm_generate_new(p, base, 0);
469 jvm_generate(p, 3, 0, "aastore");
470
471 for(int i = dim - 1; i >= 0; i--)
472 {
473 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].index -> reg);
474 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
475 jvm_generate_label(p, loop[i].end);
476 }
477 }
478
479 static void
480 jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num)
481 {
482 int dim;
483 char * cname;
484 char * desc;
485 oberon_type_t * base;
486
487 switch(type -> class)
488 {
489 case OBERON_TYPE_INTEGER:
490 case OBERON_TYPE_BOOLEAN:
491 case OBERON_TYPE_PROCEDURE:
492 case OBERON_TYPE_REAL:
493 case OBERON_TYPE_POINTER:
494 gen_error("jvm_generate_new_static: static alocation not allowed");
495 break;
496 case OBERON_TYPE_RECORD:
497 assert(num == 0);
498 cname = jvm_get_class_full_name(type);
499 jvm_generate(p, 0, 1, "new %s", cname);
500 jvm_generate(p, 1, 2, "dup");
501 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", cname);
502 break;
503 case OBERON_TYPE_ARRAY:
504 dim = 0;
505 base = type;
506 desc = jvm_get_descriptor(type);
507 while(base -> class == OBERON_TYPE_ARRAY)
508 {
509 if(num > 0)
510 {
511 assert(base -> size == 0);
512 num -= 1;
513 }
514 else
515 {
516 assert(base -> size > 0);
517 jvm_generate_push_int(p, base -> size);
518 }
519 dim += 1;
520 base = base -> base;
521 }
522
523 assert(num == 0);
524 jvm_generate(p, dim, 1, "multianewarray %s %i", desc, dim);
525 jvm_generate(p, 1, 2, "dup");
526 jvm_generate_array_initialization(p, type);
527 break;
528 default:
529 gen_error("jvm_generate_new_static: unk type class %i", type -> class);
530 break;
531 }
532 }
533
534 /*
535 * Генерирует код для копирования полей из первой записи во вторую.
536 * ( aref_dst aref_src -- )
537 * dst := src;
538 */
539
540 static void
541 jvm_generate_copy_record(gen_proc_t * p, oberon_type_t * rec)
542 {
543 assert(rec -> class == OBERON_TYPE_RECORD);
544 char * desc = jvm_get_descriptor(rec);
545 char * cname = jvm_get_class_full_name(rec);
546 jvm_generate(p, 1 + 1, 0, "invokestatic %s/$COPY$(%s%s)V", cname, desc, desc);
547 }
548
549 /*
550 * Генерирует кода для копирования массивов.
551 * ( aref_dst aref_src -- )
552 * dst := src;
553 */
554
555 static void
556 jvm_generate_copy_array(gen_proc_t * p, oberon_type_t * arr)
557 {
558 int dim = 0;
559 oberon_type_t * base = arr;
560 while(base -> class == OBERON_TYPE_ARRAY)
561 {
562 dim += 1;
563 base = base -> base;
564 }
565
566 struct {
567 gen_var_t * index;
568 gen_var_t * length;
569 int start;
570 int end;
571 } loop[dim];
572
573 gen_var_t * dst = oberon_generator_new_var();
574 gen_var_t * src = oberon_generator_new_var();
575 jvm_generate_and_init_local_var(dst, p, false);
576 jvm_generate_and_init_local_var(src, p, false);
577
578 jvm_generate_store(p, arr, src);
579 jvm_generate_store(p, arr, dst);
580
581 /*
582 * Входящие параметры заграблены.
583 * Теперь генерируем эквивалентный код:
584 * int i = 0;
585 * int len = dst.length
586 * while(i < len)
587 * {
588 * ...
589 * {
590 * copy from src[i, ...] to dst[i, ...];
591 * }
592 * ...
593 * i += 1;
594 * }
595 * Где "..." такой же код (начало и конец) для следующей размерности.
596 */
597
598 for(int i = 0; i < dim; i++)
599 {
600 loop[i].index = oberon_generator_new_var();
601 loop[i].length = oberon_generator_new_var();
602 loop[i].start = jvm_new_label_id(p);
603 loop[i].end = jvm_new_label_id(p);
604 jvm_generate_and_init_local_var(loop[i].index, p, false);
605 jvm_generate_and_init_local_var(loop[i].length, p, false);
606
607 /* TODO преределать через jvm_generate_load{{store}} */
608
609 jvm_generate(p, 0, 1, "iconst_0");
610 jvm_generate(p, 1, 0, "istore %i", loop[i].index -> reg);
611
612 jvm_generate_load(p, arr, dst);
613 jvm_generate(p, 1, 1, "arraylength");
614 jvm_generate(p, 1, 0, "istore %i", loop[i].length -> reg);
615
616 /* if(i >= len) goto end; */
617 jvm_generate_label(p, loop[i].start);
618 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
619 jvm_generate(p, 0, 1, "iload %i", loop[i].length -> reg);
620 jvm_generate(p, 2, 0, "if_icmpge L%i", loop[i].end);
621 }
622
623 if(base -> class == OBERON_TYPE_RECORD)
624 {
625 /* Получаем записи по индексам ( -- dst src ) */
626
627 jvm_generate_load(p, arr, dst);
628 for(int i = 0; i < dim; i++)
629 {
630 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
631 jvm_generate(p, 2, 1, "aaload");
632 }
633
634 jvm_generate_load(p, arr, src);
635 for(int i = 0; i < dim; i++)
636 {
637 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
638 jvm_generate(p, 2, 1, "aaload");
639 }
640
641 /* Копируем записи ( dst src -- ) */
642 jvm_generate_copy_record(p, base);
643 }
644 else
645 {
646 char postfix = jvm_get_postfix(base);
647 int cell_size = jvm_cell_size_for_postfix(postfix);
648
649 /* Получаем массивы и индексы ( -- dst i src i ) */
650
651 jvm_generate_load(p, arr, dst);
652 jvm_generate(p, 0, 1, "iload %i", loop[0].index -> reg);
653 for(int i = 1; i < dim; i++)
654 {
655 jvm_generate(p, 2, 1, "aaload");
656 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
657 }
658
659 jvm_generate_load(p, arr, src);
660 jvm_generate(p, 0, 1, "iload %i", loop[0].index -> reg);
661 for(int i = 1; i < dim; i++)
662 {
663 jvm_generate(p, 2, 1, "aaload");
664 jvm_generate(p, 0, 1, "iload %i", loop[i].index -> reg);
665 }
666
667 /* Копируем значения ( dst i src i -- ) */
668 jvm_generate(p, 2, cell_size, "%caload", postfix);
669 jvm_generate(p, 2 + cell_size, 0, "%castore", postfix);
670 }
671
672 for(int i = dim - 1; i >= 0; i--)
673 {
674 jvm_generate(p, 0, 0, "iinc %i 1", loop[i].index -> reg);
675 jvm_generate(p, 0, 0, "goto L%i", loop[i].start);
676 jvm_generate_label(p, loop[i].end);
677 }
678 }
679
680 static void
681 jvm_generate_push_procedure_pointer(gen_proc_t * p, oberon_object_t * proc)
682 {
683 char * full_name = jvm_get_field_full_name_safe(proc);
684 char * desc = jvm_get_descriptor(proc -> type);
685 jvm_generate(p, 0, 1, "getstatic %s/pointer %s", full_name, desc);
686 }
687
688 // ==========================================
689 // ==========================================
690 // ==========================================
691
692 static void
693 push_item(gen_proc_t * p, oberon_item_t * item);
694
695 void
696 oberon_generator_init_context(oberon_context_t * ctx)
697 {
698 gen_context_t * gen_context = GC_MALLOC(sizeof *gen_context);
699 memset(gen_context, 0, sizeof *gen_context);
700
701 ctx -> gen_context = gen_context;
702 }
703
704 void
705 oberon_generator_destroy_context(oberon_context_t * ctx)
706 {
707 }
708
709 static void
710 oberon_generate_procedure_class(oberon_type_t * proc)
711 {
712 FILE * fp;
713 char * cname;
714 char * signature;
715 struct gen_class * class;
716
717 cname = jvm_get_class_full_name(proc);
718 class = jvm_create_class(cname);
719 fp = class -> fp;
720
721 fprintf(fp, ".source SYSTEM\n");
722 fprintf(fp, ".class public abstract %s\n", cname);
723 fprintf(fp, ".super java/lang/Object\n\n");
724
725 fprintf(fp, ".method <init>()V\n");
726 fprintf(fp, " aload_0\n");
727 fprintf(fp, " invokespecial java/lang/Object/<init>()V\n");
728 fprintf(fp, " return\n");
729 fprintf(fp, ".end method\n\n");
730
731 signature = jvm_get_procedure_signature(proc);
732
733 fprintf(fp, ".method public abstract invoke%s\n", signature);
734 fprintf(fp, ".end method\n\n");
735
736 jvm_destroy_class(class);
737 }
738
739 static void
740 oberon_generate_procedure_pointer_class(oberon_object_t * proc)
741 {
742 FILE * fp;
743 char * cname;
744 char * abscname;
745 char * absdesc;
746 char * signature;
747 struct gen_class * class;
748
749 cname = jvm_get_field_full_name_safe(proc);
750 class = jvm_create_class(cname);
751 abscname = jvm_get_class_full_name(proc -> type);
752 absdesc = jvm_get_descriptor(proc -> type);
753 fp = class -> fp;
754
755 fprintf(fp, ".source %s\n", proc -> module -> name);
756 fprintf(fp, ".class public %s\n", cname);
757 fprintf(fp, ".super %s\n\n", abscname);
758
759 fprintf(fp, ".field public static pointer %s\n\n", absdesc);
760
761 fprintf(fp, ".method <init>()V\n");
762 fprintf(fp, " aload_0\n");
763 fprintf(fp, " invokespecial %s/<init>()V\n", abscname);
764 fprintf(fp, " aload_0\n");
765 fprintf(fp, " putstatic %s/pointer %s\n", cname, absdesc);
766 fprintf(fp, " return\n");
767 fprintf(fp, ".end method\n\n");
768
769 signature = jvm_get_procedure_signature(proc -> type);
770
771 gen_proc_t * p;
772 gen_var_t * this_v;
773
774 p = jvm_create_proc(class);
775 jvm_generate_function_header(p, "public", "invoke", signature);
776
777 this_v = oberon_generator_new_var();
778 jvm_generate_and_init_local_var(this_v, p, false);
779
780 gen_var_t * v;
781 int use_size = 0;
782 int num = proc -> type -> num_decl;
783 oberon_object_t * arg = proc -> type -> decl;
784 for(int i = 0; i < num; i++)
785 {
786 v = oberon_generator_new_var();
787 bool wide = jvm_is_wide_type(arg -> type);
788 char * desc = jvm_get_descriptor(arg -> type);
789 jvm_generate_and_init_named_local_var(v, p, wide, arg -> name, desc);
790
791 jvm_generate_load(p, arg -> type, v);
792
793 use_size += (wide) ? (2) : (1);
794
795 arg = arg -> next;
796 }
797
798 char * full_name = jvm_get_field_full_name(proc);
799 int cell_size = jvm_cell_size_for_type(proc -> type -> base);
800
801 jvm_generate(p, use_size, cell_size, "invokestatic %s%s", full_name, signature);
802
803 if(proc -> type -> base -> class == OBERON_TYPE_VOID)
804 {
805 jvm_generate(p, 0, 0, "return");
806 }
807 else
808 {
809 char prefix = jvm_get_prefix(proc -> type -> base);
810 jvm_generate(p, cell_size, 0, "%creturn", prefix);
811 }
812
813 jvm_generate_function_end(p);
814
815 jvm_destroy_class(class);
816 }
817
818 static void
819 oberon_generate_record_class(gen_module_t * m, oberon_type_t * rec)
820 {
821 char * cname;
822 struct gen_class * class;
823
824 /* Устанавливаем новоый id */
825 rec -> gen_type -> rec_id = m -> rec_id;
826 m -> rec_id += 1;
827
828 cname = jvm_get_class_full_name(rec);
829 class = jvm_create_class(cname);
830
831 fprintf(class -> fp, ".source %s\n", rec -> module -> name);
832 fprintf(class -> fp, ".class public %s\n", cname);
833
834 if(rec -> base == NULL)
835 {
836 fprintf(class -> fp, ".super java/lang/Object\n\n");
837 }
838 else
839 {
840 class -> base = rec -> base -> gen_type -> class;
841 fprintf(class -> fp, ".super %s\n\n", class -> base -> full_name);
842 }
843
844 rec -> gen_type -> class = class;
845 }
846
847 void
848 oberon_generator_init_type(oberon_context_t * ctx, oberon_type_t * type)
849 {
850 gen_type_t * t = GC_MALLOC(sizeof *t);
851 memset(t, 0, sizeof *t);
852 type -> gen_type = t;
853
854 switch(type -> class)
855 {
856 case OBERON_TYPE_VOID:
857 case OBERON_TYPE_INTEGER:
858 case OBERON_TYPE_BOOLEAN:
859 case OBERON_TYPE_ARRAY:
860 case OBERON_TYPE_REAL:
861 break;
862 case OBERON_TYPE_RECORD:
863 ;
864 gen_module_t * m;
865 m = type -> module -> gen_mod;
866 oberon_generate_record_class(m, type);
867 break;
868 case OBERON_TYPE_PROCEDURE:
869 oberon_generate_procedure_class(type);
870 break;
871 case OBERON_TYPE_POINTER:
872 break;
873 default:
874 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
875 break;
876 }
877 }
878
879 void
880 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
881 {
882 struct gen_class * class;
883 class = rec -> gen_type -> class;
884
885 int num = rec -> num_decl;
886 oberon_object_t * field = rec -> decl;
887 for(int i = 0; i < num; i++)
888 {
889 gen_var_t * v = field -> gen_var;
890 char * name = field -> name;
891 char * desc = jvm_get_descriptor(field -> type);
892 jvm_generate_and_init_field(v, class, "public", name, desc);
893 field = field -> next;
894 }
895
896 /* Стандартный конструктор класса */
897 /* Инициализирует внутренние статические записи и массивы */
898 gen_proc_t * p = jvm_create_proc(class);
899 jvm_generate_function_header(p, "public", "<init>", "()V");
900 jvm_alloc_register_untyped(p -> rf, false);
901 jvm_generate(p, 0, 1, "aload_0");
902 if(class -> base)
903 {
904 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
905 }
906 else
907 {
908 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
909 }
910 num = rec -> num_decl;
911 field = rec -> decl;
912 for(int i = 0; i < num; i++)
913 {
914 if(field -> type -> class == OBERON_TYPE_RECORD
915 || field -> type -> class == OBERON_TYPE_ARRAY)
916 {
917 jvm_generate(p, 0, 1, "aload_0");
918 jvm_generate_new(p, field -> type, 0);
919 jvm_generate_store(p, field -> type, field -> gen_var);
920 }
921 field = field -> next;
922 }
923 jvm_generate(p, 0, 0, "return");
924 jvm_generate_function_end(p);
925
926 /* Метод для копирования полей класса */
927 /* reg0 == src -> reg1 == dst */
928 p = jvm_create_proc(class);
929 gen_var_t * copy_dst = oberon_generator_new_var();
930 gen_var_t * copy_src = oberon_generator_new_var();
931 char * desc = jvm_get_descriptor(rec);
932 char * signature = new_string("(%s%s)V", desc, desc);
933 jvm_generate_function_header(p, "public static", "$COPY$", signature);
934 jvm_generate_and_init_named_local_var(copy_dst, p, false, "dst", desc);
935 jvm_generate_and_init_named_local_var(copy_src, p, false, "src", desc);
936 num = rec -> num_decl;
937 field = rec -> decl;
938 for(int i = 0; i < num; i++)
939 {
940 if(field -> type -> class == OBERON_TYPE_RECORD)
941 {
942 jvm_generate_load(p, rec, copy_dst);
943 jvm_generate_load(p, field -> type, field -> gen_var);
944 jvm_generate_load(p, rec, copy_src);
945 jvm_generate_load(p, field -> type, field -> gen_var);
946 jvm_generate_copy_record(p, field -> type);
947 }
948 else if(field -> type -> class == OBERON_TYPE_ARRAY)
949 {
950 jvm_generate_load(p, rec, copy_dst);
951 jvm_generate_load(p, field -> type, field -> gen_var);
952 jvm_generate_load(p, rec, copy_src);
953 jvm_generate_load(p, field -> type, field -> gen_var);
954 jvm_generate_copy_array(p, field -> type);
955 }
956 else
957 {
958 jvm_generate_load(p, rec, copy_dst);
959 jvm_generate_load(p, rec, copy_src);
960 jvm_generate_load(p, field -> type, field -> gen_var);
961 jvm_generate_store(p, field -> type, field -> gen_var);
962 }
963 field = field -> next;
964 }
965 jvm_generate(p, 0, 0, "return");
966 jvm_generate_function_end(p);
967
968 jvm_destroy_class(class);
969 }
970
971 void
972 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
973 {
974 gen_var_t * v = oberon_generator_new_var();
975 var -> gen_var = v;
976
977 gen_module_t * m;
978 m = ctx -> mod -> gen_mod;
979
980 struct gen_class * class;
981 class = m -> class;
982
983 char * desc;
984 switch(var -> class)
985 {
986 case OBERON_CLASS_VAR_PARAM:
987 gen_error("generator: VAR-parameters not implemented");
988 break;
989 case OBERON_CLASS_PARAM:
990 /* Заполняется при генерации функции */
991 /* смотри jvm_init_local_object() */
992 break;
993 case OBERON_CLASS_FIELD:
994 /* Заполняются при инициализации структуры */
995 /* смотри oberon_generator_init_record() */
996 break;
997 case OBERON_CLASS_VAR:
998 /* Локальные заполняются при генерации функции */
999 /* смотри jvm_init_local_object() */
1000 if(var -> local == 0)
1001 {
1002 desc = jvm_get_descriptor(var -> type);
1003 jvm_generate_and_init_global_var(v, class, "public", var -> name, desc);
1004 }
1005 break;
1006 default:
1007 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
1008 break;
1009 }
1010 }
1011
1012 void
1013 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
1014 {
1015 struct gen_class * class = proc -> module -> gen_mod -> class;
1016 proc -> gen_proc = jvm_create_proc(class);
1017
1018 if(proc -> local)
1019 {
1020 gen_error("generator: local procedures not implemented");
1021 }
1022
1023 oberon_generate_procedure_pointer_class(proc);
1024 }
1025
1026 void
1027 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
1028 {
1029 gen_module_t * m = GC_MALLOC(sizeof *m);
1030 memset(m, 0, sizeof *m);
1031 mod -> gen_mod = m;
1032
1033 struct gen_class * class;
1034 class = jvm_create_class(mod -> name);
1035
1036 fprintf(class -> fp, ".source %s\n", mod -> name);
1037 fprintf(class -> fp, ".class %s\n", mod -> name);
1038 fprintf(class -> fp, ".super java/lang/Object\n\n");
1039
1040 m -> class = class;
1041
1042 ctx -> gen_context -> current_m = m;
1043 }
1044
1045 void
1046 oberon_generator_fini_module(oberon_module_t * mod)
1047 {
1048 jvm_destroy_class(mod -> gen_mod -> class);
1049 }
1050
1051 static void
1052 push_expr(gen_proc_t * p, oberon_expr_t * expr);
1053
1054 void
1055 oberon_generate_begin_module(oberon_context_t * ctx)
1056 {
1057 struct gen_class * class = ctx -> mod -> gen_mod -> class;
1058 gen_proc_t * p = jvm_create_proc(class);
1059
1060 jvm_generate_function_header(p, "public", "<init>", "()V");
1061 jvm_alloc_register_untyped(p -> rf, false);
1062 jvm_generate(p, 0, 1, "aload_0");
1063 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
1064
1065 /* Инициализация переменных объявленных в модуле */
1066 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
1067 while(x != NULL)
1068 {
1069 if(x -> class == OBERON_CLASS_VAR)
1070 {
1071 if(x -> type -> class == OBERON_TYPE_ARRAY
1072 || x -> type -> class == OBERON_TYPE_RECORD)
1073 {
1074 jvm_generate_new(p, x -> type, 0);
1075 jvm_generate_store(p, x -> type, x -> gen_var);
1076 }
1077 }
1078 else if(x -> class == OBERON_CLASS_PROC)
1079 {
1080 char * cname = jvm_get_field_full_name_safe(x);
1081 jvm_generate(p, 0, 1, "new %s", cname);
1082 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", cname);
1083 }
1084
1085 x = x -> next;
1086 }
1087 }
1088
1089 void
1090 oberon_generate_end_module(oberon_context_t * ctx)
1091 {
1092 struct gen_class * class = ctx -> mod -> gen_mod -> class;
1093 gen_proc_t * p = class -> p;
1094
1095 jvm_generate(p, 0, 0, "return");
1096 jvm_generate_function_end(class -> p);
1097 }
1098
1099 static void
1100 jvm_init_local_object(gen_proc_t * p, oberon_object_t * x)
1101 {
1102 gen_var_t * v;
1103 bool wide;
1104 char * desc;
1105 struct gen_class * class;
1106
1107 v = x -> gen_var;
1108 class = p -> class;
1109 wide = jvm_is_wide_type(x -> type);
1110 desc = jvm_get_descriptor(x -> type);
1111
1112 // Убеждаемся что сейчас находимся в функции
1113 assert(class -> p);
1114 assert(x -> local);
1115
1116 switch(x -> class)
1117 {
1118 case OBERON_CLASS_VAR:
1119 case OBERON_CLASS_PARAM:
1120 jvm_generate_and_init_named_local_var(v, p, wide, x -> name, desc);
1121 break;
1122 default:
1123 gen_error("jvm_init_local_object: wat");
1124 break;
1125 }
1126 }
1127
1128 /*
1129 * Генерирует код для получения размера измерения массива
1130 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
1131 * ( aref -- int )
1132 */
1133
1134 static void
1135 jvm_generate_array_len(gen_proc_t * p, int dim)
1136 {
1137 while(dim > 0)
1138 {
1139 jvm_generate(p, 0, 1, "iconst_0");
1140 jvm_generate(p, 2, 1, "aaload");
1141 dim -= 1;
1142 }
1143 jvm_generate(p, 1, 1, "arraylength");
1144 }
1145
1146 static void
1147 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
1148 {
1149 int dim = 0;
1150 oberon_type_t * base = arr;
1151 while(base -> class == OBERON_TYPE_ARRAY)
1152 {
1153 if(base -> size == 0)
1154 {
1155 jvm_generate_load(p, arr, v);
1156 jvm_generate_array_len(p, dim);
1157 dim += 1;
1158 }
1159 base = base -> base;
1160 }
1161
1162 jvm_generate_new(p, arr, dim);
1163 jvm_generate(p, 1, 2, "dup");
1164 jvm_generate_load(p, arr, v);
1165 jvm_generate_copy_array(p, arr);
1166 jvm_generate_store(p, arr, v);
1167 }
1168
1169 static void
1170 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
1171 {
1172 jvm_generate_new(p, rec, 0);
1173 jvm_generate(p, 1, 2, "dup");
1174 jvm_generate_load(p, rec, v);
1175 jvm_generate_copy_record(p, rec);
1176 jvm_generate_store(p, rec, v);
1177 }
1178
1179 void
1180 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
1181 {
1182 gen_proc_t * p;
1183 char * signature;
1184
1185 p = proc -> gen_proc;
1186
1187 signature = jvm_get_procedure_signature(proc -> type);
1188 jvm_generate_function_header(p, "public static", proc -> name, signature);
1189
1190 /* Выделение регистров под параметры и переменные */
1191 oberon_object_t * var = proc -> type -> decl;
1192 while(var)
1193 {
1194 jvm_init_local_object(p, var);
1195 var = var -> next;
1196 }
1197
1198 /* Копирование статических/открытых массивов и записей */
1199 var = proc -> type -> decl;
1200 while(var)
1201 {
1202 if(var -> class == OBERON_CLASS_PARAM || var -> class == OBERON_CLASS_VAR_PARAM)
1203 {
1204 if(var -> type -> class == OBERON_TYPE_ARRAY)
1205 {
1206 jvm_generate_array_duplicate_and_replace(p, var -> gen_var, var -> type);
1207 }
1208 else if(var -> type -> class == OBERON_TYPE_RECORD)
1209 {
1210 jvm_generate_record_duplicate_and_replace(p, var -> gen_var, var -> type);
1211 }
1212 }
1213 var = var -> next;
1214 }
1215 }
1216
1217 void
1218 oberon_generate_end_proc(oberon_context_t * ctx)
1219 {
1220 gen_module_t * m;
1221 gen_proc_t * p;
1222
1223 m = ctx -> mod -> gen_mod;
1224 p = m -> class -> p;
1225
1226 jvm_generate_function_end(p);
1227 }
1228
1229 static void
1230 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1231 {
1232 assert(desig -> var == NULL);
1233 assert(desig -> mode == MODE_CALL);
1234
1235 char * signature = NULL;
1236
1237 bool direct_call = false;
1238 if(desig -> parent -> mode == MODE_VAR)
1239 {
1240 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1241 {
1242 direct_call = true;
1243 }
1244 }
1245
1246 printf("direct_call == %i\n", direct_call);
1247
1248 oberon_type_t * procsig;
1249 procsig = desig -> parent -> result;
1250 signature = jvm_get_procedure_signature(procsig);
1251
1252 if(direct_call == false)
1253 {
1254 /* Загружаем указатель на процедуру */
1255 push_item(p, desig -> parent);
1256 }
1257
1258 int args_cells = 0;
1259 int result_cells = jvm_cell_size_for_type(procsig -> base);
1260
1261 int num = desig -> num_args;
1262 oberon_expr_t * arg = desig -> args;
1263 for(int i = 0; i < num; i++)
1264 {
1265 args_cells += jvm_cell_size_for_type(arg -> result);
1266 push_expr(p, arg);
1267 arg = arg -> next;
1268 }
1269
1270 if(direct_call)
1271 {
1272 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1273 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1274 }
1275 else
1276 {
1277 char * cname = jvm_get_class_full_name(procsig);
1278 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1279 }
1280 }
1281
1282 void
1283 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1284 {
1285 assert(desig -> is_item);
1286 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1287 }
1288
1289 void
1290 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1291 {
1292 gen_module_t * m;
1293 gen_proc_t * p;
1294 char prefix;
1295 int cell_size;
1296
1297 m = ctx -> mod -> gen_mod;
1298 p = m -> class -> p;
1299
1300 if(expr)
1301 {
1302 push_expr(p, expr);
1303 prefix = jvm_get_prefix(expr -> result);
1304 cell_size = jvm_cell_size_for_type(expr -> result);
1305 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1306 }
1307 else
1308 {
1309 jvm_generate(p, 0, 0, "return");
1310 }
1311 }
1312
1313 static void
1314 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1315 {
1316 assert(type -> class == OBERON_TYPE_POINTER);
1317
1318 for(int i = 0; i < num; i++)
1319 {
1320 push_expr(p, arg);
1321 arg = arg -> next;
1322 }
1323
1324 jvm_generate_new(p, type -> base, num);
1325 }
1326
1327 static void
1328 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1329 {
1330 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1331 {
1332 char * full_name = jvm_get_class_full_name(to);
1333 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1334 }
1335 else
1336 {
1337 char prefix = jvm_get_prefix(from);
1338 char postfix = jvm_get_postfix(to);
1339 int from_cell_size = jvm_cell_size_for_type(from);
1340 int to_cell_size = jvm_cell_size_for_type(to);
1341
1342 jvm_generate_comment(p, "cast type class from %i(%i) to %i(%i)", from -> class, from -> size, to -> class, to -> size);
1343
1344 if(prefix == postfix)
1345 {
1346 return;
1347 }
1348
1349 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1350 }
1351 }
1352
1353 static void
1354 push_item(gen_proc_t * p, oberon_item_t * item)
1355 {
1356 switch(item -> mode)
1357 {
1358 case MODE_VAR:
1359 if(item -> var -> class == OBERON_CLASS_PROC)
1360 {
1361 jvm_generate_push_procedure_pointer(p, item -> var);
1362 }
1363 else
1364 {
1365 jvm_generate_load(p, item -> result, item -> var -> gen_var);
1366 }
1367 break;
1368 case MODE_INTEGER:
1369 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1370 break;
1371 case MODE_BOOLEAN:
1372 jvm_generate_push_int_size(p, item -> boolean, item -> result -> size);
1373 break;
1374 case MODE_CALL:
1375 jvm_generate_call_proc(p, item);
1376 break;
1377 case MODE_INDEX:
1378 ;
1379 char postfix = jvm_get_postfix(item -> result);
1380 int cell_size = jvm_cell_size_for_postfix(postfix);
1381 assert(item -> parent -> is_item);
1382 push_item(p, (oberon_item_t *) item -> parent);
1383 push_expr(p, item -> args);
1384 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1385 break;
1386 case MODE_FIELD:
1387 assert(item -> parent -> is_item);
1388 push_item(p, (oberon_item_t *) item -> parent);
1389 jvm_generate_load(p, item -> result, item -> var -> gen_var);
1390 break;
1391 case MODE_DEREF:
1392 /* Все объекты в jvm представляются как указатели */
1393 assert(item -> parent -> is_item);
1394 push_item(p, (oberon_item_t *) item -> parent);
1395 break;
1396 case MODE_NIL:
1397 jvm_generate(p, 0, 1, "aconst_null");
1398 break;
1399 case MODE_NEW:
1400 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1401 break;
1402 case MODE_REAL:
1403 jvm_generate_push_float(p, item -> real, item -> result -> size);
1404 break;
1405 default:
1406 gen_error("push_item: unk mode %i", item -> mode);
1407 break;
1408 }
1409 }
1410
1411 static void
1412 jvm_generate_logical_not(gen_proc_t * p)
1413 {
1414 int label_done = jvm_new_label_id(p);
1415 int label_false = jvm_new_label_id(p);
1416 char * label_name_done = jvm_get_label_name(label_done);
1417 char * label_name_false = jvm_get_label_name(label_false);
1418
1419 jvm_generate(p, 1, 0, "ifne %s", label_name_false);
1420 jvm_generate(p, 0, 1, "iconst_1");
1421 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1422 jvm_generate_label(p, label_false);
1423 jvm_generate(p, 0, 1, "iconst_0");
1424 jvm_generate_label(p, label_done);
1425 }
1426
1427 static void
1428 jvm_generate_abs(gen_proc_t * p, char prefix)
1429 {
1430 char t = jvm_get_type_of_prefix(prefix);
1431 int cell_size = jvm_cell_size_for_postfix(prefix);
1432 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1433 }
1434
1435 static void
1436 jvm_generate_compare_op(gen_proc_t * p, char prefix, int op)
1437 {
1438 int label_true = jvm_new_label_id(p);
1439 int label_done = jvm_new_label_id(p);
1440 char * label_name_true = jvm_get_label_name(label_true);
1441 char * label_name_done = jvm_get_label_name(label_done);
1442 int cell_size = 2 * jvm_cell_size_for_postfix(prefix);
1443
1444 assert(prefix == 'i' || prefix == 'a');
1445
1446 const char * cmpop = "";
1447 switch(op)
1448 {
1449 case OP_EQ:
1450 cmpop = "eq";
1451 break;
1452 case OP_NEQ:
1453 cmpop = "ne";
1454 break;
1455 case OP_LSS:
1456 cmpop = "lt";
1457 break;
1458 case OP_LEQ:
1459 cmpop = "le";
1460 break;
1461 case OP_GRT:
1462 cmpop = "gt";
1463 break;
1464 case OP_GEQ:
1465 cmpop = "ge";
1466 break;
1467 default:
1468 gen_error("jvm_generate_compare_op: wat");
1469 break;
1470 }
1471
1472 jvm_generate(p, cell_size, 0, "if_%ccmp%s %s", prefix, cmpop, label_name_true);
1473 jvm_generate(p, 0, 1, "iconst_0");
1474 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1475 jvm_generate_label(p, label_true);
1476 jvm_generate(p, 0, 1, "iconst_1");
1477 jvm_generate_label(p, label_done);
1478 }
1479
1480 static void
1481 jvm_generate_operator(gen_proc_t * p, char prefix, int op)
1482 {
1483 int cell_size = jvm_cell_size_for_postfix(prefix);
1484 switch(op)
1485 {
1486 case OP_UNARY_MINUS:
1487 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1488 break;
1489 case OP_BITWISE_NOT:
1490 jvm_generate_push_int(p, -1);
1491 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1492 break;
1493 case OP_LOGIC_NOT:
1494 jvm_generate_logical_not(p);
1495 break;
1496 case OP_ABS:
1497 jvm_generate_abs(p, prefix);
1498 break;
1499
1500 case OP_ADD:
1501 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1502 break;
1503 case OP_SUB:
1504 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1505 break;
1506 case OP_MUL:
1507 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1508 break;
1509 case OP_DIV:
1510 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1511 break;
1512 case OP_MOD:
1513 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1514 break;
1515 case OP_BITWISE_AND:
1516 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1517 break;
1518 case OP_BITWISE_XOR:
1519 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1520 break;
1521 case OP_BITWISE_OR:
1522 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1523 break;
1524
1525 case OP_EQ:
1526 case OP_NEQ:
1527 case OP_LSS:
1528 case OP_LEQ:
1529 case OP_GRT:
1530 case OP_GEQ:
1531 jvm_generate_compare_op(p, prefix, op);
1532 break;
1533 default:
1534 gen_error("jvm_generate_operator: unk op %i", op);
1535 break;
1536 }
1537 }
1538
1539 static void
1540 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1541 {
1542 int label_calc_b = jvm_new_label_id(p);
1543 int label_done = jvm_new_label_id(p);
1544 char * label_name_calc_b = jvm_get_label_name(label_calc_b);
1545 char * label_name_done = jvm_get_label_name(label_done);
1546
1547 /* a OR b -- если a, то TRUE, иначе b */
1548
1549 push_expr(p, a);
1550 jvm_generate(p, 1, 0, "ifne %s", label_name_calc_b);
1551 jvm_generate(p, 0, 1, "iconst_1");
1552 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1553 jvm_generate_label(p, label_calc_b);
1554 push_expr(p, b);
1555 jvm_generate_label(p, label_done);
1556 }
1557
1558 static void
1559 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1560 {
1561 int label_false = jvm_new_label_id(p);
1562 int label_done = jvm_new_label_id(p);
1563 char * label_name_false = jvm_get_label_name(label_false);
1564 char * label_name_done = jvm_get_label_name(label_done);
1565
1566 /* a AND b -- если a, то b, иначе FALSE */
1567
1568 push_expr(p, a);
1569 jvm_generate(p, 1, 0, "ifne %s", label_name_false);
1570 push_expr(p, b);
1571 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1572 jvm_generate_label(p, label_false);
1573 jvm_generate(p, 0, 1, "iconst_0");
1574 jvm_generate_label(p, label_done);
1575 }
1576
1577 static void
1578 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1579 {
1580 char prefix = jvm_get_prefix(oper -> result);
1581 int op = oper -> op;
1582 switch(op)
1583 {
1584 case OP_CAST:
1585 push_expr(p, oper -> left);
1586 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1587 break;
1588 case OP_UNARY_MINUS:
1589 case OP_BITWISE_NOT:
1590 case OP_LOGIC_NOT:
1591 case OP_ABS:
1592 push_expr(p, oper -> left);
1593 jvm_generate_operator(p, prefix, op);
1594 break;
1595
1596 case OP_ADD:
1597 case OP_SUB:
1598 case OP_MUL:
1599 case OP_DIV:
1600 case OP_MOD:
1601 case OP_BITWISE_AND:
1602 case OP_BITWISE_XOR:
1603 case OP_BITWISE_OR:
1604
1605 case OP_EQ:
1606 case OP_NEQ:
1607 case OP_LSS:
1608 case OP_LEQ:
1609 case OP_GRT:
1610 case OP_GEQ:
1611 push_expr(p, oper -> left);
1612 push_expr(p, oper -> right);
1613 jvm_generate_operator(p, prefix, op);
1614 break;
1615
1616 case OP_LOGIC_OR:
1617 jvm_generate_logical_or(p, oper -> left, oper -> right);
1618 break;
1619 case OP_LOGIC_AND:
1620 jvm_generate_logical_and(p, oper -> left, oper -> right);
1621 break;
1622 default:
1623 gen_error("push_oper: unk op %i", op);
1624 break;
1625 }
1626 }
1627
1628 static void
1629 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1630 {
1631 if(expr -> is_item)
1632 {
1633 push_item(p, (oberon_item_t *) expr);
1634 }
1635 else
1636 {
1637 push_operator(p, (oberon_oper_t *) expr);
1638 }
1639 }
1640
1641 static void
1642 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1643 {
1644 assert(dst -> is_item);
1645 oberon_item_t * item = (oberon_item_t *) dst;
1646
1647 if(dst -> result -> class == OBERON_TYPE_ARRAY
1648 || src -> result -> class == OBERON_TYPE_ARRAY)
1649 {
1650 push_expr(p, dst);
1651 push_expr(p, src);
1652 jvm_generate_copy_array(p, dst -> result);
1653 }
1654 else if(dst -> result -> class == OBERON_TYPE_RECORD
1655 || src -> result -> class == OBERON_TYPE_RECORD)
1656 {
1657 push_expr(p, dst);
1658 push_expr(p, src);
1659 jvm_generate_copy_record(p, dst -> result);
1660 }
1661 else switch(item -> mode)
1662 {
1663 case MODE_VAR:
1664 push_expr(p, src);
1665 jvm_generate_store(p, src -> result, item -> var -> gen_var);
1666 break;
1667 case MODE_INDEX:
1668 ;
1669 char postfix = jvm_get_postfix(src -> result);
1670 int cell_size = jvm_cell_size_for_postfix(postfix);
1671 assert(item -> parent -> is_item);
1672 push_item(p, (oberon_item_t *) item -> parent);
1673 push_expr(p, item -> args);
1674 push_expr(p, src);
1675 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1676 break;
1677 case MODE_FIELD:
1678 assert(item -> parent -> is_item);
1679 push_item(p, (oberon_item_t *) item -> parent);
1680 push_expr(p, src);
1681 jvm_generate_store(p, src -> result, item -> var -> gen_var);
1682 break;
1683 default:
1684 gen_error("store_expr: unk mode %i", item -> mode);
1685 break;
1686 }
1687 }
1688
1689 void
1690 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1691 {
1692 gen_module_t * m;
1693 gen_proc_t * p;
1694
1695 m = ctx -> mod -> gen_mod;
1696 p = m -> class -> p;
1697
1698 store_expr(p, dst, src);
1699 }
1700
1701 void
1702 oberon_generate_code(oberon_context_t * ctx)
1703 {
1704 printf("generate code\n");
1705 }
1706
1707 void
1708 oberon_generator_dump(oberon_context_t * ctx, char * path)
1709 {
1710 printf("jit: dump code\n");
1711 }
1712
1713 void *
1714 oberon_generator_get_procedure(oberon_context_t * ctx, const char * name)
1715 {
1716 printf("jit: get pointer to procedure %s\n", name);
1717 return NULL;
1718 }
1719
1720 void *
1721 oberon_generator_get_var(oberon_context_t * ctx, const char * name)
1722 {
1723 printf("jit: get pointer to var %s\n", name);
1724 return NULL;
1725 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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