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[dsw-obn.git] / src / backends / jvm / generator-jvm.c
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <stdarg.h>
4 #include <stdint.h>
5 #include <stdbool.h>
6 #include <string.h>
7 #include <assert.h>
8
9 #include <gc.h>
10
11 #include "../../../include/oberon.h"
12 #include "../../oberon-internals.h"
13 #include "generator-jvm.h"
14 #include "generator-jvm-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, " return\n");
765 fprintf(fp, ".end method\n\n");
766
767 fprintf(fp, ".method static <clinit>()V\n");
768 fprintf(fp, " .limit stack 2\n");
769 fprintf(fp, " new %s\n", cname);
770 fprintf(fp, " dup\n");
771 fprintf(fp, " invokespecial %s/<init>()V\n", cname);
772 fprintf(fp, " putstatic %s/pointer %s\n", cname, absdesc);
773 fprintf(fp, " return\n");
774 fprintf(fp, ".end method\n\n");
775
776 signature = jvm_get_procedure_signature(proc -> type);
777
778 gen_proc_t * p;
779 gen_var_t * this_v;
780
781 p = jvm_create_proc(class);
782 jvm_generate_function_header(p, "public", "invoke", signature);
783
784 this_v = oberon_generator_new_var();
785 jvm_generate_and_init_local_var(this_v, p, false);
786
787 gen_var_t * v;
788 int use_size = 0;
789 int num = proc -> type -> num_decl;
790 oberon_object_t * arg = proc -> type -> decl;
791 for(int i = 0; i < num; i++)
792 {
793 v = oberon_generator_new_var();
794 bool wide = jvm_is_wide_type(arg -> type);
795 char * desc = jvm_get_descriptor(arg -> type);
796 jvm_generate_and_init_named_local_var(v, p, wide, arg -> name, desc);
797
798 jvm_generate_load(p, arg -> type, v);
799
800 use_size += (wide) ? (2) : (1);
801
802 arg = arg -> next;
803 }
804
805 char * full_name = jvm_get_field_full_name(proc);
806 int cell_size = jvm_cell_size_for_type(proc -> type -> base);
807
808 jvm_generate(p, use_size, cell_size, "invokestatic %s%s", full_name, signature);
809
810 if(proc -> type -> base -> class == OBERON_TYPE_VOID)
811 {
812 jvm_generate(p, 0, 0, "return");
813 }
814 else
815 {
816 char prefix = jvm_get_prefix(proc -> type -> base);
817 jvm_generate(p, cell_size, 0, "%creturn", prefix);
818 }
819
820 jvm_generate_function_end(p);
821
822 jvm_destroy_class(class);
823 }
824
825 static void
826 oberon_generate_record_class(gen_module_t * m, oberon_type_t * rec)
827 {
828 char * cname;
829 struct gen_class * class;
830
831 /* Устанавливаем новоый id */
832 rec -> gen_type -> rec_id = m -> rec_id;
833 m -> rec_id += 1;
834
835 cname = jvm_get_class_full_name(rec);
836 class = jvm_create_class(cname);
837
838 fprintf(class -> fp, ".source %s\n", rec -> module -> name);
839 fprintf(class -> fp, ".class public %s\n", cname);
840
841 if(rec -> base == NULL)
842 {
843 fprintf(class -> fp, ".super java/lang/Object\n\n");
844 }
845 else
846 {
847 class -> base = rec -> base -> gen_type -> class;
848 fprintf(class -> fp, ".super %s\n\n", class -> base -> full_name);
849 }
850
851 rec -> gen_type -> class = class;
852 }
853
854 void
855 oberon_generator_init_type(oberon_context_t * ctx, oberon_type_t * type)
856 {
857 gen_type_t * t = GC_MALLOC(sizeof *t);
858 memset(t, 0, sizeof *t);
859 type -> gen_type = t;
860
861 switch(type -> class)
862 {
863 case OBERON_TYPE_VOID:
864 case OBERON_TYPE_INTEGER:
865 case OBERON_TYPE_BOOLEAN:
866 case OBERON_TYPE_ARRAY:
867 case OBERON_TYPE_REAL:
868 case OBERON_TYPE_CHAR:
869 break;
870 case OBERON_TYPE_RECORD:
871 ;
872 gen_module_t * m;
873 m = type -> module -> gen_mod;
874 oberon_generate_record_class(m, type);
875 break;
876 case OBERON_TYPE_PROCEDURE:
877 oberon_generate_procedure_class(type);
878 break;
879 case OBERON_TYPE_POINTER:
880 break;
881 default:
882 gen_error("oberon_generator_init_type: unk calss %i", type -> class);
883 break;
884 }
885 }
886
887 void
888 oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
889 {
890 struct gen_class * class;
891 class = rec -> gen_type -> class;
892
893 int num = rec -> num_decl;
894 oberon_object_t * field = rec -> decl;
895 for(int i = 0; i < num; i++)
896 {
897 gen_var_t * v = field -> gen_var;
898 char * name = field -> name;
899 char * desc = jvm_get_descriptor(field -> type);
900 jvm_generate_and_init_field(v, class, "public", name, desc);
901 field = field -> next;
902 }
903
904 /* Стандартный конструктор класса */
905 /* Инициализирует внутренние статические записи и массивы */
906 gen_proc_t * p = jvm_create_proc(class);
907 jvm_generate_function_header(p, "public", "<init>", "()V");
908 jvm_alloc_register_untyped(p -> rf, false);
909 jvm_generate(p, 0, 1, "aload_0");
910 if(class -> base)
911 {
912 jvm_generate(p, 1, 0, "invokespecial %s/<init>()V", class -> base -> full_name);
913 }
914 else
915 {
916 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
917 }
918 num = rec -> num_decl;
919 field = rec -> decl;
920 for(int i = 0; i < num; i++)
921 {
922 if(field -> type -> class == OBERON_TYPE_RECORD
923 || field -> type -> class == OBERON_TYPE_ARRAY)
924 {
925 jvm_generate(p, 0, 1, "aload_0");
926 jvm_generate_new(p, field -> type, 0);
927 jvm_generate_store(p, field -> type, field -> gen_var);
928 }
929 field = field -> next;
930 }
931 jvm_generate(p, 0, 0, "return");
932 jvm_generate_function_end(p);
933
934 /* Метод для копирования полей класса */
935 /* reg0 == src -> reg1 == dst */
936 p = jvm_create_proc(class);
937 gen_var_t * copy_dst = oberon_generator_new_var();
938 gen_var_t * copy_src = oberon_generator_new_var();
939 char * desc = jvm_get_descriptor(rec);
940 char * signature = new_string("(%s%s)V", desc, desc);
941 jvm_generate_function_header(p, "public static", "$COPY$", signature);
942 jvm_generate_and_init_named_local_var(copy_dst, p, false, "dst", desc);
943 jvm_generate_and_init_named_local_var(copy_src, p, false, "src", desc);
944 num = rec -> num_decl;
945 field = rec -> decl;
946 for(int i = 0; i < num; i++)
947 {
948 if(field -> type -> class == OBERON_TYPE_RECORD)
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_record(p, field -> type);
955 }
956 else if(field -> type -> class == OBERON_TYPE_ARRAY)
957 {
958 jvm_generate_load(p, rec, copy_dst);
959 jvm_generate_load(p, field -> type, field -> gen_var);
960 jvm_generate_load(p, rec, copy_src);
961 jvm_generate_load(p, field -> type, field -> gen_var);
962 jvm_generate_copy_array(p, field -> type);
963 }
964 else
965 {
966 jvm_generate_load(p, rec, copy_dst);
967 jvm_generate_load(p, rec, copy_src);
968 jvm_generate_load(p, field -> type, field -> gen_var);
969 jvm_generate_store(p, field -> type, field -> gen_var);
970 }
971 field = field -> next;
972 }
973 jvm_generate(p, 0, 0, "return");
974 jvm_generate_function_end(p);
975
976 jvm_destroy_class(class);
977 }
978
979 void
980 oberon_generator_init_var(oberon_context_t * ctx, oberon_object_t * var)
981 {
982 gen_var_t * v = oberon_generator_new_var();
983 var -> gen_var = v;
984
985 gen_module_t * m;
986 m = ctx -> mod -> gen_mod;
987
988 struct gen_class * class;
989 class = m -> class;
990
991 char * desc;
992 switch(var -> class)
993 {
994 case OBERON_CLASS_VAR_PARAM:
995 gen_error("generator: VAR-parameters not implemented");
996 break;
997 case OBERON_CLASS_PARAM:
998 /* Заполняется при генерации функции */
999 /* смотри jvm_init_local_object() */
1000 break;
1001 case OBERON_CLASS_FIELD:
1002 /* Заполняются при инициализации структуры */
1003 /* смотри oberon_generator_init_record() */
1004 break;
1005 case OBERON_CLASS_VAR:
1006 /* Локальные заполняются при генерации функции */
1007 /* смотри jvm_init_local_object() */
1008 if(var -> local == 0)
1009 {
1010 desc = jvm_get_descriptor(var -> type);
1011 jvm_generate_and_init_global_var(v, class, "public", var -> name, desc);
1012 }
1013 break;
1014 default:
1015 gen_error("oberon_generator_init_var: unk var class %i", var -> class);
1016 break;
1017 }
1018 }
1019
1020 void
1021 oberon_generator_init_proc(oberon_context_t * ctx, oberon_object_t * proc)
1022 {
1023 struct gen_class * class = proc -> module -> gen_mod -> class;
1024 proc -> gen_proc = jvm_create_proc(class);
1025
1026 if(proc -> local)
1027 {
1028 gen_error("generator: local procedures not implemented");
1029 }
1030
1031 oberon_generate_procedure_pointer_class(proc);
1032 }
1033
1034 void
1035 oberon_generator_init_module(oberon_context_t * ctx, oberon_module_t * mod)
1036 {
1037 gen_module_t * m = GC_MALLOC(sizeof *m);
1038 memset(m, 0, sizeof *m);
1039 mod -> gen_mod = m;
1040
1041 struct gen_class * class;
1042 class = jvm_create_class(mod -> name);
1043
1044 fprintf(class -> fp, ".source %s\n", mod -> name);
1045 fprintf(class -> fp, ".class %s\n", mod -> name);
1046 fprintf(class -> fp, ".super java/lang/Object\n\n");
1047
1048 m -> class = class;
1049
1050 ctx -> gen_context -> current_m = m;
1051 }
1052
1053 void
1054 oberon_generator_fini_module(oberon_module_t * mod)
1055 {
1056 jvm_destroy_class(mod -> gen_mod -> class);
1057 }
1058
1059 static void
1060 push_expr(gen_proc_t * p, oberon_expr_t * expr);
1061
1062 void
1063 oberon_generate_begin_module(oberon_context_t * ctx)
1064 {
1065 struct gen_class * class = ctx -> mod -> gen_mod -> class;
1066 gen_proc_t * p = jvm_create_proc(class);
1067
1068 jvm_generate_function_header(p, "public", "<init>", "()V");
1069 jvm_alloc_register_untyped(p -> rf, false);
1070 jvm_generate(p, 0, 1, "aload_0");
1071 jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
1072
1073 /* Инициализация переменных объявленных в модуле */
1074 oberon_object_t * x = ctx -> mod -> decl -> list -> next;
1075 while(x != NULL)
1076 {
1077 if(x -> class == OBERON_CLASS_VAR)
1078 {
1079 if(x -> type -> class == OBERON_TYPE_ARRAY
1080 || x -> type -> class == OBERON_TYPE_RECORD)
1081 {
1082 jvm_generate_new(p, x -> type, 0);
1083 jvm_generate_store(p, x -> type, x -> gen_var);
1084 }
1085 }
1086
1087 x = x -> next;
1088 }
1089 }
1090
1091 void
1092 oberon_generate_end_module(oberon_context_t * ctx)
1093 {
1094 struct gen_class * class = ctx -> mod -> gen_mod -> class;
1095 gen_proc_t * p = class -> p;
1096
1097 jvm_generate(p, 0, 0, "return");
1098 jvm_generate_function_end(class -> p);
1099 }
1100
1101 static void
1102 jvm_init_local_object(gen_proc_t * p, oberon_object_t * x)
1103 {
1104 gen_var_t * v;
1105 bool wide;
1106 char * desc;
1107 struct gen_class * class;
1108
1109 v = x -> gen_var;
1110 class = p -> class;
1111 wide = jvm_is_wide_type(x -> type);
1112 desc = jvm_get_descriptor(x -> type);
1113
1114 // Убеждаемся что сейчас находимся в функции
1115 assert(class -> p);
1116 assert(x -> local);
1117
1118 switch(x -> class)
1119 {
1120 case OBERON_CLASS_VAR:
1121 case OBERON_CLASS_PARAM:
1122 jvm_generate_and_init_named_local_var(v, p, wide, x -> name, desc);
1123 break;
1124 default:
1125 gen_error("jvm_init_local_object: wat");
1126 break;
1127 }
1128 }
1129
1130 /*
1131 * Генерирует код для получения размера измерения массива
1132 * Аналог Обероновского LEN(v, n); где n = 0 - первое измерение.
1133 * ( aref -- int )
1134 */
1135
1136 static void
1137 jvm_generate_array_len(gen_proc_t * p, int dim)
1138 {
1139 while(dim > 0)
1140 {
1141 jvm_generate(p, 0, 1, "iconst_0");
1142 jvm_generate(p, 2, 1, "aaload");
1143 dim -= 1;
1144 }
1145 jvm_generate(p, 1, 1, "arraylength");
1146 }
1147
1148 static void
1149 jvm_generate_array_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * arr)
1150 {
1151 int dim = 0;
1152 oberon_type_t * base = arr;
1153 while(base -> class == OBERON_TYPE_ARRAY)
1154 {
1155 if(base -> size == 0)
1156 {
1157 jvm_generate_load(p, arr, v);
1158 jvm_generate_array_len(p, dim);
1159 dim += 1;
1160 }
1161 base = base -> base;
1162 }
1163
1164 jvm_generate_new(p, arr, dim);
1165 jvm_generate(p, 1, 2, "dup");
1166 jvm_generate_load(p, arr, v);
1167 jvm_generate_copy_array(p, arr);
1168 jvm_generate_store(p, arr, v);
1169 }
1170
1171 static void
1172 jvm_generate_record_duplicate_and_replace(gen_proc_t * p, gen_var_t * v, oberon_type_t * rec)
1173 {
1174 jvm_generate_new(p, rec, 0);
1175 jvm_generate(p, 1, 2, "dup");
1176 jvm_generate_load(p, rec, v);
1177 jvm_generate_copy_record(p, rec);
1178 jvm_generate_store(p, rec, v);
1179 }
1180
1181 void
1182 oberon_generate_begin_proc(oberon_context_t * ctx, oberon_object_t * proc)
1183 {
1184 gen_proc_t * p;
1185 char * signature;
1186
1187 p = proc -> gen_proc;
1188
1189 signature = jvm_get_procedure_signature(proc -> type);
1190 jvm_generate_function_header(p, "public static", proc -> name, signature);
1191
1192 /* Выделение регистров под параметры и переменные */
1193 oberon_object_t * var = proc -> type -> decl;
1194 while(var)
1195 {
1196 jvm_init_local_object(p, var);
1197 var = var -> next;
1198 }
1199
1200 /* Копирование статических/открытых массивов и записей */
1201 var = proc -> type -> decl;
1202 while(var)
1203 {
1204 if(var -> class == OBERON_CLASS_PARAM || var -> class == OBERON_CLASS_VAR_PARAM)
1205 {
1206 if(var -> type -> class == OBERON_TYPE_ARRAY)
1207 {
1208 jvm_generate_array_duplicate_and_replace(p, var -> gen_var, var -> type);
1209 }
1210 else if(var -> type -> class == OBERON_TYPE_RECORD)
1211 {
1212 jvm_generate_record_duplicate_and_replace(p, var -> gen_var, var -> type);
1213 }
1214 }
1215 var = var -> next;
1216 }
1217 }
1218
1219 void
1220 oberon_generate_end_proc(oberon_context_t * ctx)
1221 {
1222 gen_module_t * m;
1223 gen_proc_t * p;
1224
1225 m = ctx -> mod -> gen_mod;
1226 p = m -> class -> p;
1227
1228 jvm_generate_function_end(p);
1229 }
1230
1231 static void
1232 jvm_generate_call_proc(gen_proc_t * p, oberon_item_t * desig)
1233 {
1234 assert(desig -> var == NULL);
1235 assert(desig -> mode == MODE_CALL);
1236
1237 char * signature = NULL;
1238
1239 bool direct_call = false;
1240 if(desig -> parent -> mode == MODE_VAR)
1241 {
1242 if(desig -> parent -> var -> class == OBERON_CLASS_PROC)
1243 {
1244 direct_call = true;
1245 }
1246 }
1247
1248 printf("direct_call == %i\n", direct_call);
1249
1250 oberon_type_t * procsig;
1251 procsig = desig -> parent -> result;
1252 signature = jvm_get_procedure_signature(procsig);
1253
1254 if(direct_call == false)
1255 {
1256 /* Загружаем указатель на процедуру */
1257 push_item(p, desig -> parent);
1258 }
1259
1260 int args_cells = 0;
1261 int result_cells = jvm_cell_size_for_type(procsig -> base);
1262
1263 int num = desig -> num_args;
1264 oberon_expr_t * arg = desig -> args;
1265 for(int i = 0; i < num; i++)
1266 {
1267 args_cells += jvm_cell_size_for_type(arg -> result);
1268 push_expr(p, arg);
1269 arg = arg -> next;
1270 }
1271
1272 if(direct_call)
1273 {
1274 char * full_name = jvm_get_field_full_name(desig -> parent -> var);
1275 jvm_generate(p, args_cells, result_cells, "invokestatic %s%s", full_name, signature);
1276 }
1277 else
1278 {
1279 char * cname = jvm_get_class_full_name(procsig);
1280 jvm_generate(p, 1 + args_cells, result_cells, "invokevirtual %s/invoke%s", cname, signature);
1281 }
1282 }
1283
1284 void
1285 oberon_generate_call_proc(oberon_context_t * ctx, oberon_expr_t * desig)
1286 {
1287 assert(desig -> is_item);
1288 jvm_generate_call_proc(ctx -> mod -> gen_mod -> class -> p, (oberon_item_t *) desig);
1289 }
1290
1291 void
1292 oberon_generate_return(oberon_context_t * ctx, oberon_expr_t * expr)
1293 {
1294 gen_module_t * m;
1295 gen_proc_t * p;
1296 char prefix;
1297 int cell_size;
1298
1299 m = ctx -> mod -> gen_mod;
1300 p = m -> class -> p;
1301
1302 if(expr)
1303 {
1304 push_expr(p, expr);
1305 prefix = jvm_get_prefix(expr -> result);
1306 cell_size = jvm_cell_size_for_type(expr -> result);
1307 jvm_generate(p, cell_size, 0, "%creturn", prefix);
1308 }
1309 else
1310 {
1311 jvm_generate(p, 0, 0, "return");
1312 }
1313 }
1314
1315 static void
1316 jvm_generate_expr_new_pointer(gen_proc_t * p, oberon_type_t * type, int num, oberon_expr_t * arg)
1317 {
1318 assert(type -> class == OBERON_TYPE_POINTER);
1319
1320 for(int i = 0; i < num; i++)
1321 {
1322 push_expr(p, arg);
1323 arg = arg -> next;
1324 }
1325
1326 jvm_generate_new(p, type -> base, num);
1327 }
1328
1329 static void
1330 jvm_generate_cast_type(gen_proc_t * p, oberon_type_t * from, oberon_type_t * to)
1331 {
1332 if(to -> class == OBERON_TYPE_RECORD || to -> class == OBERON_TYPE_POINTER)
1333 {
1334 char * full_name = jvm_get_class_full_name(to);
1335 jvm_generate(p, 1, 1, "checkcast %s", full_name);
1336 }
1337 else
1338 {
1339 char prefix = jvm_get_prefix(from);
1340 char postfix = jvm_get_postfix(to);
1341 int from_cell_size = jvm_cell_size_for_type(from);
1342 int to_cell_size = jvm_cell_size_for_type(to);
1343
1344 jvm_generate_comment(p, "cast type class from %i(%i) to %i(%i)", from -> class, from -> size, to -> class, to -> size);
1345
1346 if(prefix == postfix)
1347 {
1348 return;
1349 }
1350
1351 jvm_generate(p, from_cell_size, to_cell_size, "%c2%c", prefix, postfix);
1352 }
1353 }
1354
1355 static void
1356 push_item(gen_proc_t * p, oberon_item_t * item)
1357 {
1358 switch(item -> mode)
1359 {
1360 case MODE_VAR:
1361 if(item -> var -> class == OBERON_CLASS_PROC)
1362 {
1363 jvm_generate_push_procedure_pointer(p, item -> var);
1364 }
1365 else
1366 {
1367 jvm_generate_load(p, item -> result, item -> var -> gen_var);
1368 }
1369 break;
1370 case MODE_INTEGER:
1371 case MODE_CHAR:
1372 jvm_generate_push_int_size(p, item -> integer, item -> result -> size);
1373 break;
1374 case MODE_BOOLEAN:
1375 jvm_generate_push_int_size(p, item -> boolean, item -> result -> size);
1376 break;
1377 case MODE_CALL:
1378 jvm_generate_call_proc(p, item);
1379 break;
1380 case MODE_INDEX:
1381 ;
1382 char postfix = jvm_get_postfix(item -> result);
1383 int cell_size = jvm_cell_size_for_postfix(postfix);
1384 assert(item -> parent -> is_item);
1385 push_item(p, (oberon_item_t *) item -> parent);
1386 push_expr(p, item -> args);
1387 jvm_generate(p, 1 + 1, cell_size, "%caload", postfix);
1388 break;
1389 case MODE_FIELD:
1390 assert(item -> parent -> is_item);
1391 push_item(p, (oberon_item_t *) item -> parent);
1392 jvm_generate_load(p, item -> result, item -> var -> gen_var);
1393 break;
1394 case MODE_DEREF:
1395 /* Все объекты в jvm представляются как указатели */
1396 assert(item -> parent -> is_item);
1397 push_item(p, (oberon_item_t *) item -> parent);
1398 break;
1399 case MODE_NIL:
1400 jvm_generate(p, 0, 1, "aconst_null");
1401 break;
1402 case MODE_NEW:
1403 jvm_generate_expr_new_pointer(p, item -> result, item -> num_args, item -> args);
1404 break;
1405 case MODE_REAL:
1406 jvm_generate_push_float(p, item -> real, item -> result -> size);
1407 break;
1408 default:
1409 gen_error("push_item: unk mode %i", item -> mode);
1410 break;
1411 }
1412 }
1413
1414 static void
1415 jvm_generate_logical_not(gen_proc_t * p)
1416 {
1417 int label_done = jvm_new_label_id(p);
1418 int label_false = jvm_new_label_id(p);
1419 char * label_name_done = jvm_get_label_name(label_done);
1420 char * label_name_false = jvm_get_label_name(label_false);
1421
1422 jvm_generate(p, 1, 0, "ifne %s", label_name_false);
1423 jvm_generate(p, 0, 1, "iconst_1");
1424 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1425 jvm_generate_label(p, label_false);
1426 jvm_generate(p, 0, 1, "iconst_0");
1427 jvm_generate_label(p, label_done);
1428 }
1429
1430 static void
1431 jvm_generate_abs(gen_proc_t * p, char prefix)
1432 {
1433 char t = jvm_get_type_of_prefix(prefix);
1434 int cell_size = jvm_cell_size_for_postfix(prefix);
1435 jvm_generate(p, cell_size, cell_size, "invokestatic java/lang/Math/abs(%c)%c", t, t);
1436 }
1437
1438 static void
1439 jvm_generate_compare_op(gen_proc_t * p, char prefix, int op)
1440 {
1441 int label_true = jvm_new_label_id(p);
1442 int label_done = jvm_new_label_id(p);
1443 char * label_name_true = jvm_get_label_name(label_true);
1444 char * label_name_done = jvm_get_label_name(label_done);
1445 int cell_size = 2 * jvm_cell_size_for_postfix(prefix);
1446
1447 assert(prefix == 'i' || prefix == 'a');
1448
1449 const char * cmpop = "";
1450 switch(op)
1451 {
1452 case OP_EQ:
1453 cmpop = "eq";
1454 break;
1455 case OP_NEQ:
1456 cmpop = "ne";
1457 break;
1458 case OP_LSS:
1459 cmpop = "lt";
1460 break;
1461 case OP_LEQ:
1462 cmpop = "le";
1463 break;
1464 case OP_GRT:
1465 cmpop = "gt";
1466 break;
1467 case OP_GEQ:
1468 cmpop = "ge";
1469 break;
1470 default:
1471 gen_error("jvm_generate_compare_op: wat");
1472 break;
1473 }
1474
1475 jvm_generate(p, cell_size, 0, "if_%ccmp%s %s", prefix, cmpop, label_name_true);
1476 jvm_generate(p, 0, 1, "iconst_0");
1477 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1478 jvm_generate_label(p, label_true);
1479 jvm_generate(p, 0, 1, "iconst_1");
1480 jvm_generate_label(p, label_done);
1481 }
1482
1483 static void
1484 jvm_generate_operator(gen_proc_t * p, char prefix, int op)
1485 {
1486 int cell_size = jvm_cell_size_for_postfix(prefix);
1487 switch(op)
1488 {
1489 case OP_UNARY_MINUS:
1490 jvm_generate(p, cell_size, cell_size, "%cneg", prefix);
1491 break;
1492 case OP_BITWISE_NOT:
1493 jvm_generate_push_int(p, -1);
1494 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1495 break;
1496 case OP_LOGIC_NOT:
1497 jvm_generate_logical_not(p);
1498 break;
1499 case OP_ABS:
1500 jvm_generate_abs(p, prefix);
1501 break;
1502
1503 case OP_ADD:
1504 jvm_generate(p, 2 * cell_size, cell_size, "%cadd", prefix);
1505 break;
1506 case OP_SUB:
1507 jvm_generate(p, 2 * cell_size, cell_size, "%csub", prefix);
1508 break;
1509 case OP_MUL:
1510 jvm_generate(p, 2 * cell_size, cell_size, "%cmul", prefix);
1511 break;
1512 case OP_DIV:
1513 jvm_generate(p, 2 * cell_size, cell_size, "%cdiv", prefix);
1514 break;
1515 case OP_MOD:
1516 jvm_generate(p, 2 * cell_size, cell_size, "%crem", prefix);
1517 break;
1518 case OP_BITWISE_AND:
1519 jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
1520 break;
1521 case OP_BITWISE_XOR:
1522 jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
1523 break;
1524 case OP_BITWISE_OR:
1525 jvm_generate(p, 2 * cell_size, cell_size, "%cor", prefix);
1526 break;
1527
1528 case OP_EQ:
1529 case OP_NEQ:
1530 case OP_LSS:
1531 case OP_LEQ:
1532 case OP_GRT:
1533 case OP_GEQ:
1534 jvm_generate_compare_op(p, prefix, op);
1535 break;
1536 default:
1537 gen_error("jvm_generate_operator: unk op %i", op);
1538 break;
1539 }
1540 }
1541
1542 static void
1543 jvm_generate_logical_or(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1544 {
1545 int label_calc_b = jvm_new_label_id(p);
1546 int label_done = jvm_new_label_id(p);
1547 char * label_name_calc_b = jvm_get_label_name(label_calc_b);
1548 char * label_name_done = jvm_get_label_name(label_done);
1549
1550 /* a OR b -- если a, то TRUE, иначе b */
1551
1552 push_expr(p, a);
1553 jvm_generate(p, 1, 0, "ifne %s", label_name_calc_b);
1554 jvm_generate(p, 0, 1, "iconst_1");
1555 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1556 jvm_generate_label(p, label_calc_b);
1557 push_expr(p, b);
1558 jvm_generate_label(p, label_done);
1559 }
1560
1561 static void
1562 jvm_generate_logical_and(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
1563 {
1564 int label_false = jvm_new_label_id(p);
1565 int label_done = jvm_new_label_id(p);
1566 char * label_name_false = jvm_get_label_name(label_false);
1567 char * label_name_done = jvm_get_label_name(label_done);
1568
1569 /* a AND b -- если a, то b, иначе FALSE */
1570
1571 push_expr(p, a);
1572 jvm_generate(p, 1, 0, "ifne %s", label_name_false);
1573 push_expr(p, b);
1574 jvm_generate(p, 0, 0, "goto %s", label_name_done);
1575 jvm_generate_label(p, label_false);
1576 jvm_generate(p, 0, 1, "iconst_0");
1577 jvm_generate_label(p, label_done);
1578 }
1579
1580 static void
1581 push_operator(gen_proc_t * p, oberon_oper_t * oper)
1582 {
1583 char prefix = jvm_get_prefix(oper -> result);
1584 int op = oper -> op;
1585 switch(op)
1586 {
1587 case OP_CAST:
1588 push_expr(p, oper -> left);
1589 jvm_generate_cast_type(p, oper -> left -> result, oper -> result);
1590 break;
1591 case OP_UNARY_MINUS:
1592 case OP_BITWISE_NOT:
1593 case OP_LOGIC_NOT:
1594 case OP_ABS:
1595 push_expr(p, oper -> left);
1596 jvm_generate_operator(p, prefix, op);
1597 break;
1598
1599 case OP_ADD:
1600 case OP_SUB:
1601 case OP_MUL:
1602 case OP_DIV:
1603 case OP_MOD:
1604 case OP_BITWISE_AND:
1605 case OP_BITWISE_XOR:
1606 case OP_BITWISE_OR:
1607
1608 case OP_EQ:
1609 case OP_NEQ:
1610 case OP_LSS:
1611 case OP_LEQ:
1612 case OP_GRT:
1613 case OP_GEQ:
1614 push_expr(p, oper -> left);
1615 push_expr(p, oper -> right);
1616 jvm_generate_operator(p, prefix, op);
1617 break;
1618
1619 case OP_LOGIC_OR:
1620 jvm_generate_logical_or(p, oper -> left, oper -> right);
1621 break;
1622 case OP_LOGIC_AND:
1623 jvm_generate_logical_and(p, oper -> left, oper -> right);
1624 break;
1625 default:
1626 gen_error("push_oper: unk op %i", op);
1627 break;
1628 }
1629 }
1630
1631 static void
1632 push_expr(gen_proc_t * p, oberon_expr_t * expr)
1633 {
1634 if(expr -> is_item)
1635 {
1636 push_item(p, (oberon_item_t *) expr);
1637 }
1638 else
1639 {
1640 push_operator(p, (oberon_oper_t *) expr);
1641 }
1642 }
1643
1644 static void
1645 store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
1646 {
1647 assert(dst -> is_item);
1648 oberon_item_t * item = (oberon_item_t *) dst;
1649
1650 if(dst -> result -> class == OBERON_TYPE_ARRAY
1651 || src -> result -> class == OBERON_TYPE_ARRAY)
1652 {
1653 push_expr(p, dst);
1654 push_expr(p, src);
1655 jvm_generate_copy_array(p, dst -> result);
1656 }
1657 else if(dst -> result -> class == OBERON_TYPE_RECORD
1658 || src -> result -> class == OBERON_TYPE_RECORD)
1659 {
1660 push_expr(p, dst);
1661 push_expr(p, src);
1662 jvm_generate_copy_record(p, dst -> result);
1663 }
1664 else switch(item -> mode)
1665 {
1666 case MODE_VAR:
1667 push_expr(p, src);
1668 jvm_generate_store(p, src -> result, item -> var -> gen_var);
1669 break;
1670 case MODE_INDEX:
1671 ;
1672 char postfix = jvm_get_postfix(src -> result);
1673 int cell_size = jvm_cell_size_for_postfix(postfix);
1674 assert(item -> parent -> is_item);
1675 push_item(p, (oberon_item_t *) item -> parent);
1676 push_expr(p, item -> args);
1677 push_expr(p, src);
1678 jvm_generate(p, 1 + 1 + cell_size, 0, "%castore", postfix);
1679 break;
1680 case MODE_FIELD:
1681 assert(item -> parent -> is_item);
1682 push_item(p, (oberon_item_t *) item -> parent);
1683 push_expr(p, src);
1684 jvm_generate_store(p, src -> result, item -> var -> gen_var);
1685 break;
1686 default:
1687 gen_error("store_expr: unk mode %i", item -> mode);
1688 break;
1689 }
1690 }
1691
1692 void
1693 oberon_generate_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
1694 {
1695 gen_module_t * m;
1696 gen_proc_t * p;
1697
1698 m = ctx -> mod -> gen_mod;
1699 p = m -> class -> p;
1700
1701 store_expr(p, dst, src);
1702 }
1703
1704 void
1705 oberon_generate_code(oberon_context_t * ctx)
1706 {
1707 printf("generate code\n");
1708 }
1709
1710 void
1711 oberon_generator_dump(oberon_context_t * ctx, char * path)
1712 {
1713 printf("jit: dump code\n");
1714 }
1715
1716 void *
1717 oberon_generator_get_procedure(oberon_context_t * ctx, const char * name)
1718 {
1719 printf("jit: get pointer to procedure %s\n", name);
1720 return NULL;
1721 }
1722
1723 void *
1724 oberon_generator_get_var(oberon_context_t * ctx, const char * name)
1725 {
1726 printf("jit: get pointer to var %s\n", name);
1727 return NULL;
1728 }
Another attempt to make Oberon compiler
[25/02/2024 19:55:35]
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