emitbc.c 18.7 KB
Newer Older
Damien's avatar
Damien committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "misc.h"
#include "lexer.h"
#include "machine.h"
#include "parse.h"
#include "compile.h"
#include "scope.h"
#include "runtime.h"
#include "emit.h"
#include "bc.h"

#ifdef EMIT_DO_BC

struct _emitter_t {
    int pass;
    int next_label;
    int stack_size;
    bool last_emit_was_return_value;

    scope_t *scope;

    int max_num_labels;
    uint *label_offsets;

    uint code_offset;
    uint code_size;
    byte *code_base;
    byte dummy_data[8];
};

emitter_t *emit_new() {
    emitter_t *emit = m_new(emitter_t, 1);
    emit->max_num_labels = 0;
    emit->label_offsets = NULL;
    emit->code_offset = 0;
    emit->code_size = 0;
    emit->code_base = NULL;
    return emit;
}

uint emit_get_code_size(emitter_t* emit) {
    return emit->code_size;
}

void* emit_get_code(emitter_t* emit) {
    return emit->code_base;
}

void emit_start_pass(emitter_t *emit, pass_kind_t pass, scope_t *scope) {
    emit->pass = pass;
    emit->next_label = 1;
    emit->stack_size = 0;
    emit->last_emit_was_return_value = false;
    emit->scope = scope;
    if (pass == PASS_1) {
        scope->unique_code_id = rt_get_new_unique_code_id();
    } else if (pass > PASS_1) {
        if (emit->label_offsets == NULL) {
            emit->label_offsets = m_new(uint, emit->max_num_labels);
        }
        if (pass == PASS_2) {
            memset(emit->label_offsets, -1, emit->max_num_labels * sizeof(uint));
        }
    }
    emit->code_offset = 0;
}

void emit_end_pass(emitter_t *emit) {
    // check stack is back to zero size
    if (emit->stack_size != 0) {
        printf("ERROR: stack size not back to zero; got %d\n", emit->stack_size);
    }

    if (emit->pass == PASS_1) {
        // calculate number of labels need
        if (emit->next_label > emit->max_num_labels) {
            emit->max_num_labels = emit->next_label;
        }

    } else if (emit->pass == PASS_2) {
        // calculate size of code in bytes
        emit->code_size = emit->code_offset;
        emit->code_base = m_new(byte, emit->code_size);
        printf("code_size: %u\n", emit->code_size);

    } else if (emit->pass == PASS_3) {
        rt_assign_byte_code(emit->scope->unique_code_id, emit->code_base, emit->code_size, emit->scope->num_params);
    }
}

// all functions must go through this one to emit bytes
static byte* emit_get_cur_to_write_bytes(emitter_t* emit, int num_bytes_to_write) {
    //printf("emit %d\n", num_bytes_to_write);
    if (emit->pass < PASS_3) {
        emit->code_offset += num_bytes_to_write;
        return emit->dummy_data;
    } else {
        assert(emit->code_offset + num_bytes_to_write <= emit->code_size);
        byte *c = emit->code_base + emit->code_offset;
        emit->code_offset += num_bytes_to_write;
        return c;
    }
}

static void emit_write_byte_1(emitter_t* emit, byte b1) {
    byte* c = emit_get_cur_to_write_bytes(emit, 1);
    c[0] = b1;
}

static void emit_write_byte_1_byte(emitter_t* emit, byte b1, uint b2) {
    assert((b2 & (~0xff)) == 0);
    byte* c = emit_get_cur_to_write_bytes(emit, 2);
    c[0] = b1;
    c[1] = b2;
}

static void emit_write_byte_1_int(emitter_t* emit, byte b1, int num) {
    assert((num & (~0x7fff)) == 0 || (num & (~0x7fff)) == (~0x7fff));
    byte* c = emit_get_cur_to_write_bytes(emit, 3);
    c[0] = b1;
    c[1] = num;
    c[2] = num >> 8;
}

static void emit_write_byte_1_uint(emitter_t* emit, byte b1, uint num) {
    if (num <= 127) { // fits in 0x7f
        // fit argument in single byte
        byte* c = emit_get_cur_to_write_bytes(emit, 2);
        c[0] = b1;
        c[1] = num;
    } else if (num <= 16383) { // fits in 0x3fff
        // fit argument in two bytes
        byte* c = emit_get_cur_to_write_bytes(emit, 3);
        c[0] = b1;
        c[1] = (num >> 8) | 0x80;
        c[2] = num;
    } else {
        // larger numbers not implemented/supported
        assert(0);
    }
}

static void emit_write_byte_1_qstr(emitter_t* emit, byte b1, qstr qstr) {
    emit_write_byte_1_uint(emit, b1, qstr);
}

static void emit_write_byte_1_label(emitter_t* emit, byte b1, int label) {
    uint code_offset;
    if (emit->pass < PASS_3) {
        code_offset = 0;
    } else {
        code_offset = emit->label_offsets[label];
    }
    emit_write_byte_1_uint(emit, b1, code_offset);
}

bool emit_last_emit_was_return_value(emitter_t *emit) {
    return emit->last_emit_was_return_value;
}

int emit_get_stack_size(emitter_t *emit) {
    return emit->stack_size;
}

void emit_set_stack_size(emitter_t *emit, int size) {
    if (emit->pass > PASS_1) {
        emit->stack_size = size;
    }
}

static void emit_pre(emitter_t *emit, int stack_size_delta) {
    if (emit->pass > PASS_1) {
        emit->stack_size += stack_size_delta;
        if (emit->stack_size > emit->scope->stack_size) {
            emit->scope->stack_size = emit->stack_size;
        }
    }
    emit->last_emit_was_return_value = false;
}

int emit_label_new(emitter_t *emit) {
    return emit->next_label++;
}

void emit_label_assign(emitter_t *emit, int l) {
    emit_pre(emit, 0);
    if (emit->pass > PASS_1) {
        assert(l < emit->max_num_labels);
        if (emit->pass == PASS_2) {
            // assign label offset
            assert(emit->label_offsets[l] == -1);
            emit->label_offsets[l] = emit->code_offset;
        } else if (emit->pass == PASS_3) {
            // ensure label offset has not changed from PASS_2 to PASS_3
            assert(emit->label_offsets[l] == emit->code_offset);
            //printf("l%d: (at %d)\n", l, emit->code_offset);
        }
    }
}

void emit_import_name(emitter_t *emit, qstr qstr) {
    emit_pre(emit, -1);
    emit_write_byte_1_qstr(emit, PYBC_IMPORT_NAME, qstr);
}

void emit_import_from(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    emit_write_byte_1_qstr(emit, PYBC_IMPORT_FROM, qstr);
}

void emit_import_star(emitter_t *emit) {
    emit_pre(emit, -1);
    emit_write_byte_1(emit, PYBC_IMPORT_STAR);
}

void emit_load_const_tok(emitter_t *emit, py_token_kind_t tok) {
    emit_pre(emit, 1);
    switch (tok) {
        case PY_TOKEN_KW_FALSE: emit_write_byte_1(emit, PYBC_LOAD_CONST_FALSE); break;
        case PY_TOKEN_KW_NONE: emit_write_byte_1(emit, PYBC_LOAD_CONST_NONE); break;
        case PY_TOKEN_KW_TRUE: emit_write_byte_1(emit, PYBC_LOAD_CONST_TRUE); break;
        default: assert(0);
    }
}

void emit_load_const_small_int(emitter_t *emit, int arg) {
    emit_pre(emit, 1);
    emit_write_byte_1_int(emit, PYBC_LOAD_CONST_SMALL_INT, arg);
}

void emit_load_const_int(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_CONST_INT, qstr);
}

void emit_load_const_dec(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_CONST_DEC, qstr);
}

void emit_load_const_id(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_CONST_ID, qstr);
}

void emit_load_const_str(emitter_t *emit, qstr qstr, bool bytes) {
    emit_pre(emit, 1);
    if (bytes) {
        emit_write_byte_1_qstr(emit, PYBC_LOAD_CONST_BYTES, qstr);
    } else {
        emit_write_byte_1_qstr(emit, PYBC_LOAD_CONST_STRING, qstr);
    }
}

void emit_load_const_verbatim_start(emitter_t *emit) {
    emit_pre(emit, 1);
    assert(0);
}

void emit_load_const_verbatim_int(emitter_t *emit, int val) {
    assert(0);
}

void emit_load_const_verbatim_str(emitter_t *emit, const char *str) {
    assert(0);
}

void emit_load_const_verbatim_strn(emitter_t *emit, const char *str, int len) {
    assert(0);
}

void emit_load_const_verbatim_quoted_str(emitter_t *emit, qstr qstr, bool bytes) {
    assert(0);
}

void emit_load_const_verbatim_end(emitter_t *emit) {
    assert(0);
}

void emit_load_fast(emitter_t *emit, qstr qstr, int local_num) {
    assert(local_num >= 0);
    emit_pre(emit, 1);
    switch (local_num) {
        case 0: emit_write_byte_1(emit, PYBC_LOAD_FAST_0); break;
        case 1: emit_write_byte_1(emit, PYBC_LOAD_FAST_1); break;
        case 2: emit_write_byte_1(emit, PYBC_LOAD_FAST_2); break;
        default: emit_write_byte_1_uint(emit, PYBC_LOAD_FAST_N, local_num); break;
    }
}

void emit_load_name(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_NAME, qstr);
}

void emit_load_global(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_GLOBAL, qstr);
}

void emit_load_deref(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    assert(0);
}

void emit_load_closure(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 1);
    assert(0);
}

void emit_load_attr(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 0);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_ATTR, qstr);
}

void emit_load_method(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 0);
    emit_write_byte_1_qstr(emit, PYBC_LOAD_METHOD, qstr);
}

void emit_load_build_class(emitter_t *emit) {
    emit_pre(emit, 1);
    emit_write_byte_1(emit, PYBC_LOAD_BUILD_CLASS);
}

void emit_store_fast(emitter_t *emit, qstr qstr, int local_num) {
    assert(local_num >= 0);
    emit_pre(emit, -1);
    switch (local_num) {
        case 0: emit_write_byte_1(emit, PYBC_STORE_FAST_0); break;
        case 1: emit_write_byte_1(emit, PYBC_STORE_FAST_1); break;
        case 2: emit_write_byte_1(emit, PYBC_STORE_FAST_2); break;
        default: emit_write_byte_1_uint(emit, PYBC_STORE_FAST_N, local_num); break;
    }
}

void emit_store_name(emitter_t *emit, qstr qstr) {
    emit_pre(emit, -1);
    emit_write_byte_1_qstr(emit, PYBC_STORE_NAME, qstr);
}

void emit_store_global(emitter_t *emit, qstr qstr) {
    emit_pre(emit, -1);
    emit_write_byte_1_qstr(emit, PYBC_STORE_GLOBAL, qstr);
}

void emit_store_deref(emitter_t *emit, qstr qstr) {
    emit_pre(emit, -1);
    assert(0);
}

void emit_store_attr(emitter_t *emit, qstr qstr) {
    emit_pre(emit, -2);
    emit_write_byte_1_qstr(emit, PYBC_STORE_ATTR, qstr);
}

void emit_store_locals(emitter_t *emit) {
    emit_pre(emit, -1);
    emit_write_byte_1(emit, PYBC_STORE_LOCALS);
}

void emit_store_subscr(emitter_t *emit) {
    emit_pre(emit, -3);
    emit_write_byte_1(emit, PYBC_STORE_SUBSCR);
}

void emit_delete_fast(emitter_t *emit, qstr qstr, int local_num) {
    assert(local_num >= 0);
    emit_pre(emit, 0);
    emit_write_byte_1_uint(emit, PYBC_DELETE_FAST_N, local_num);
}

void emit_delete_name(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 0);
    emit_write_byte_1_qstr(emit, PYBC_DELETE_NAME, qstr);
}

void emit_delete_global(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 0);
    emit_write_byte_1_qstr(emit, PYBC_DELETE_GLOBAL, qstr);
}

void emit_delete_deref(emitter_t *emit, qstr qstr) {
    emit_pre(emit, 0);
    emit_write_byte_1_qstr(emit, PYBC_DELETE_DEREF, qstr);
}

void emit_delete_attr(emitter_t *emit, qstr qstr) {
    emit_pre(emit, -1);
    emit_write_byte_1_qstr(emit, PYBC_DELETE_ATTR, qstr);
}

void emit_delete_subscr(emitter_t *emit) {
    emit_pre(emit, -2);
    emit_write_byte_1(emit, PYBC_DELETE_SUBSCR);
}

void emit_dup_top(emitter_t *emit) {
    emit_pre(emit, 1);
    emit_write_byte_1(emit, PYBC_DUP_TOP);
}

void emit_dup_top_two(emitter_t *emit) {
    emit_pre(emit, 2);
    emit_write_byte_1(emit, PYBC_DUP_TOP_TWO);
}

void emit_pop_top(emitter_t *emit) {
    emit_pre(emit, -1);
    emit_write_byte_1(emit, PYBC_POP_TOP);
}

void emit_rot_two(emitter_t *emit) {
    emit_pre(emit, 0);
    emit_write_byte_1(emit, PYBC_ROT_TWO);
}

void emit_rot_three(emitter_t *emit) {
    emit_pre(emit, 0);
    emit_write_byte_1(emit, PYBC_ROT_THREE);
}

void emit_jump(emitter_t *emit, int label) {
    emit_pre(emit, 0);
    emit_write_byte_1_label(emit, PYBC_JUMP, label);
}

void emit_pop_jump_if_true(emitter_t *emit, int label) {
    emit_pre(emit, -1);
    emit_write_byte_1_label(emit, PYBC_POP_JUMP_IF_TRUE, label);
}

void emit_pop_jump_if_false(emitter_t *emit, int label) {
    emit_pre(emit, -1);
    emit_write_byte_1_label(emit, PYBC_POP_JUMP_IF_FALSE, label);
}

void emit_jump_if_true_or_pop(emitter_t *emit, int label) {
    emit_pre(emit, -1);
    emit_write_byte_1_label(emit, PYBC_JUMP_IF_TRUE_OR_POP, label);
}

void emit_jump_if_false_or_pop(emitter_t *emit, int label) {
    emit_pre(emit, -1);
    emit_write_byte_1_label(emit, PYBC_JUMP_IF_FALSE_OR_POP, label);
}

void emit_setup_loop(emitter_t *emit, int label) {
    emit_pre(emit, 0);
    emit_write_byte_1_label(emit, PYBC_SETUP_LOOP, label);
}

void emit_break_loop(emitter_t *emit, int label) {
    emit_pre(emit, 0);
    emit_write_byte_1_label(emit, PYBC_BREAK_LOOP, label);
}

void emit_continue_loop(emitter_t *emit, int label) {
    emit_pre(emit, 0);
    emit_write_byte_1_label(emit, PYBC_CONTINUE_LOOP, label);
}

void emit_setup_with(emitter_t *emit, int label) {
    emit_pre(emit, 7);
    emit_write_byte_1_label(emit, PYBC_SETUP_WITH, label);
}

void emit_with_cleanup(emitter_t *emit) {
    emit_pre(emit, -7);
    emit_write_byte_1(emit, PYBC_WITH_CLEANUP);
}

void emit_setup_except(emitter_t *emit, int label) {
    emit_pre(emit, 6);
    emit_write_byte_1_label(emit, PYBC_SETUP_EXCEPT, label);
}

void emit_setup_finally(emitter_t *emit, int label) {
    emit_pre(emit, 6);
    emit_write_byte_1_label(emit, PYBC_SETUP_FINALLY, label);
}

void emit_end_finally(emitter_t *emit) {
    emit_pre(emit, -1);
    emit_write_byte_1(emit, PYBC_END_FINALLY);
}

void emit_get_iter(emitter_t *emit) {
    emit_pre(emit, 0);
    emit_write_byte_1(emit, PYBC_GET_ITER);
}

void emit_for_iter(emitter_t *emit, int label) {
    emit_pre(emit, 1);
    emit_write_byte_1_label(emit, PYBC_FOR_ITER, label);
}

void emit_for_iter_end(emitter_t *emit) {
    emit_pre(emit, -1);
}

void emit_pop_block(emitter_t *emit) {
    emit_pre(emit, 0);
    emit_write_byte_1(emit, PYBC_POP_BLOCK);
}

void emit_pop_except(emitter_t *emit) {
    emit_pre(emit, 0);
    emit_write_byte_1(emit, PYBC_POP_EXCEPT);
}

void emit_unary_op(emitter_t *emit, rt_unary_op_t op) {
    emit_pre(emit, 0);
    emit_write_byte_1_byte(emit, PYBC_UNARY_OP, op);
}

void emit_binary_op(emitter_t *emit, rt_binary_op_t op) {
    emit_pre(emit, -1);
    emit_write_byte_1_byte(emit, PYBC_BINARY_OP, op);
}

void emit_compare_op(emitter_t *emit, rt_compare_op_t op) {
    emit_pre(emit, -1);
    emit_write_byte_1_byte(emit, PYBC_COMPARE_OP, op);
}

void emit_build_tuple(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, 1 - n_args);
    emit_write_byte_1_uint(emit, PYBC_BUILD_TUPLE, n_args);
}

void emit_build_list(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, 1 - n_args);
    emit_write_byte_1_uint(emit, PYBC_BUILD_LIST, n_args);
}

void emit_list_append(emitter_t *emit, int list_stack_index) {
    assert(list_stack_index >= 0);
    emit_pre(emit, -1);
    emit_write_byte_1_uint(emit, PYBC_LIST_APPEND, list_stack_index);
}

void emit_build_map(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, 1);
    emit_write_byte_1_uint(emit, PYBC_BUILD_MAP, n_args);
}

void emit_store_map(emitter_t *emit) {
    emit_pre(emit, -2);
    emit_write_byte_1(emit, PYBC_STORE_MAP);
}

void emit_map_add(emitter_t *emit, int map_stack_index) {
    assert(map_stack_index >= 0);
    emit_pre(emit, -2);
    emit_write_byte_1_uint(emit, PYBC_MAP_ADD, map_stack_index);
}

void emit_build_set(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, 1 - n_args);
    emit_write_byte_1_uint(emit, PYBC_BUILD_SET, n_args);
}

void emit_set_add(emitter_t *emit, int set_stack_index) {
    assert(set_stack_index >= 0);
    emit_pre(emit, -1);
    emit_write_byte_1_uint(emit, PYBC_SET_ADD, set_stack_index);
}

void emit_build_slice(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, 1 - n_args);
    emit_write_byte_1_uint(emit, PYBC_BUILD_SLICE, n_args);
}

void emit_unpack_sequence(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, -1 + n_args);
    emit_write_byte_1_uint(emit, PYBC_UNPACK_SEQUENCE, n_args);
}

void emit_unpack_ex(emitter_t *emit, int n_left, int n_right) {
    assert(n_left >=0 && n_right >= 0);
    emit_pre(emit, -1 + n_left + n_right + 1);
    emit_write_byte_1_uint(emit, PYBC_UNPACK_EX, n_left | (n_right << 8));
}

void emit_make_function(emitter_t *emit, scope_t *scope, int n_dict_params, int n_default_params) {
    assert(n_default_params == 0 && n_dict_params == 0);
    emit_pre(emit, 1);
    emit_write_byte_1_uint(emit, PYBC_MAKE_FUNCTION, scope->unique_code_id);
}

void emit_make_closure(emitter_t *emit, scope_t *scope, int n_dict_params, int n_default_params) {
    assert(0);
    emit_pre(emit, -2 - n_default_params - 2 * n_dict_params);
    if (emit->pass == PASS_3) {
        printf("MAKE_CLOSURE %d\n", (n_dict_params << 8) | n_default_params);
    }
}

void emit_call_function(emitter_t *emit, int n_positional, int n_keyword, bool have_star_arg, bool have_dbl_star_arg) {
    int s = 0;
    if (have_star_arg) {
        s += 1;
    }
    if (have_dbl_star_arg) {
        s += 1;
    }
    emit_pre(emit, -n_positional - 2 * n_keyword - s);
    int op;
    if (have_star_arg) {
        if (have_dbl_star_arg) {
            op = PYBC_CALL_FUNCTION_VAR_KW;
        } else {
            op = PYBC_CALL_FUNCTION_VAR;
        }
    } else {
        if (have_dbl_star_arg) {
            op = PYBC_CALL_FUNCTION_KW;
        } else {
            op = PYBC_CALL_FUNCTION;
        }
    }
    emit_write_byte_1_uint(emit, op, (n_keyword << 8) | n_positional); // TODO make it 2 separate uints
}

void emit_call_method(emitter_t *emit, int n_positional, int n_keyword, bool have_star_arg, bool have_dbl_star_arg) {
    int s = 0;
    if (have_star_arg) {
        s += 1;
    }
    if (have_dbl_star_arg) {
        s += 1;
    }
    emit_pre(emit, -n_positional - 2 * n_keyword - s);
    int op;
    if (have_star_arg) {
        if (have_dbl_star_arg) {
            op = PYBC_CALL_METHOD_VAR_KW;
        } else {
            op = PYBC_CALL_METHOD_VAR;
        }
    } else {
        if (have_dbl_star_arg) {
            op = PYBC_CALL_METHOD_KW;
        } else {
            op = PYBC_CALL_METHOD;
        }
    }
    emit_write_byte_1_uint(emit, op, (n_keyword << 8) | n_positional); // TODO make it 2 separate uints
}

void emit_return_value(emitter_t *emit) {
    emit_pre(emit, -1);
    emit->last_emit_was_return_value = true;
    emit_write_byte_1(emit, PYBC_RETURN_VALUE);
}

void emit_raise_varargs(emitter_t *emit, int n_args) {
    assert(n_args >= 0);
    emit_pre(emit, -n_args);
    emit_write_byte_1_uint(emit, PYBC_RAISE_VARARGS, n_args);
}

void emit_yield_value(emitter_t *emit) {
    emit_pre(emit, 0);
    if (emit->pass == PASS_2) {
        emit->scope->flags |= SCOPE_FLAG_GENERATOR;
    }
    emit_write_byte_1(emit, PYBC_YIELD_VALUE);
}

void emit_yield_from(emitter_t *emit) {
    emit_pre(emit, -1);
    if (emit->pass == PASS_2) {
        emit->scope->flags |= SCOPE_FLAG_GENERATOR;
    }
    emit_write_byte_1(emit, PYBC_YIELD_FROM);
}

#endif // EMIT_DO_BC