aboutsummaryrefslogtreecommitdiff
path: root/src/ldebug.js
blob: 2aa83966e447a5e6db76b075016393254d535e8d (plain)
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
"use strict";

const assert = require('assert');

const defs     = require('./defs.js');
const ldo      = require('./ldo.js');
const lfunc    = require('./lfunc.js');
const llex     = require('./llex.js');
const lobject  = require('./lobject.js');
const lopcodes = require('./lopcodes.js');
const lstate   = require('./lstate.js');
const ltable   = require('./ltable.js');
const ltm      = require('./ltm.js');
const luaconf  = require('./luaconf.js');
const lvm      = require('./lvm.js');

const char = defs.char;
const CT = defs.constant_types;
const TS = defs.thread_status;

const currentpc = function(ci) {
    assert(ci.callstatus & lstate.CIST_LUA);
    return ci.l_savedpc - 1;
};

const currentline = function(ci) {
    return ci.func.value.p.lineinfo.length !== 0 ? ci.func.value.p.lineinfo[currentpc(ci)] : -1;
};

/*
** If function yielded, its 'func' can be in the 'extra' field. The
** next function restores 'func' to its correct value for debugging
** purposes. (It exchanges 'func' and 'extra'; so, when called again,
** after debugging, it also "re-restores" ** 'func' to its altered value.
*/
const swapextra = function(L) {
    if (L.status === TS.LUA_YIELD) {
        let ci = L.ci;  /* get function that yielded */
        let temp = ci.funcOff;  /* exchange its 'func' and 'extra' values */
        ci.func = L.stack[ci.extra];
        ci.funcOff = ci.extra;
        ci.extra = temp;
    }
};

const lua_sethook = function(L, func, mask, count) {
    if (func === null || mask === 0) {  /* turn off hooks? */
        mask = 0;
        func = null;
    }
    if (L.ci.callstatus & lstate.CIST_LUA)
        L.oldpc = L.ci.l_savedpc;
    L.hook = func;
    L.basehookcount = count;
    L.hookcount = L.basehookcount;
    L.hookmask = mask;
};

const lua_gethook = function(L) {
    return L.hook;
};


const lua_gethookmask = function(L) {
    return L.hookmask;
};


const lua_gethookcount = function(L) {
    return L.basehookcount;
};

const lua_getstack = function(L, level, ar) {
    let ci;
    let status;
    if (level < 0) return 0;  /* invalid (negative) level */
    for (ci = L.ci; level > 0 && ci !== L.base_ci; ci = ci.previous)
        level--;
    if (level === 0 && ci !== L.base_ci) {  /* level found? */
        status = 1;
        ar.i_ci = ci;
    } else
        status = 0;  /* no such level */
    return status;
};

const upvalname = function(p, uv) {
    assert(uv < p.upvalues.length);
    let s = p.upvalues[uv].name;
    if (s === null) return defs.to_luastring("?", true);
    return s.getstr();
};

const findvararg = function(ci, n) {
    let nparams = ci.func.value.p.numparams;
    if (n >= ci.l_base - ci.funcOff - nparams)
        return null;  /* no such vararg */
    else {
        return {
            pos: ci.funcOff + nparams + n,
            name: defs.to_luastring("(*vararg)", true)  /* generic name for any vararg */
        };
    }
};

const findlocal = function(L, ci, n) {
    let base, name = null;

    if (ci.callstatus & lstate.CIST_LUA) {
        if (n < 0)  /* access to vararg values? */
            return findvararg(ci, -n);
        else {
            base = ci.l_base;
            name = lfunc.luaF_getlocalname(ci.func.value.p, n, currentpc(ci));
        }
    } else
        base = ci.funcOff + 1;

    if (name === null) {  /* no 'standard' name? */
        let limit = ci === L.ci ? L.top : ci.next.funcOff;
        if (limit - base >= n && n > 0)  /* is 'n' inside 'ci' stack? */
            name = defs.to_luastring("(*temporary)", true);  /* generic name for any valid slot */
        else
            return null;  /* no name */
    }
    return {
        pos: base + (n - 1),
        name: name
    };
};

const lua_getlocal = function(L, ar, n) {
    let name;
    swapextra(L);
    if (ar === null) {  /* information about non-active function? */
        if (!L.stack[L.top - 1].ttisLclosure())  /* not a Lua function? */
            name = null;
        else  /* consider live variables at function start (parameters) */
            name = lfunc.luaF_getlocalname(L.stack[L.top - 1].value.p, n, 0);
    } else {  /* active function; get information through 'ar' */
        let local = findlocal(L, ar.i_ci, n);
        if (local) {
            name = local.name;
            lobject.pushobj2s(L, L.stack[local.pos]);
            assert(L.top <= L.ci.top, "stack overflow");
        } else {
            name = null;
        }
    }
    swapextra(L);
    return name;
};

const lua_setlocal = function(L, ar, n) {
    let name;
    swapextra(L);
    let local = findlocal(L, ar.i_ci, n);
    if (local) {
        name = local.name;
        lobject.setobjs2s(L, local.pos, L.top - 1);
        delete L.stack[--L.top];  /* pop value */
    } else {
        name = null;
    }
    swapextra(L);
    return name;
};

const funcinfo = function(ar, cl) {
    if (cl === null || cl instanceof lobject.CClosure) {
        ar.source = defs.to_luastring("=[JS]", true);
        ar.linedefined = -1;
        ar.lastlinedefined = -1;
        ar.what = defs.to_luastring("J", true);
    } else {
        let p = cl.p;
        ar.source = p.source ? p.source.getstr() : defs.to_luastring("=?", true);
        ar.linedefined = p.linedefined;
        ar.lastlinedefined = p.lastlinedefined;
        ar.what = ar.linedefined === 0 ? defs.to_luastring("main", true) : defs.to_luastring("Lua", true);
    }

    ar.short_src = lobject.luaO_chunkid(ar.source, luaconf.LUA_IDSIZE);
};

const collectvalidlines = function(L, f) {
    if (f === null || f instanceof lobject.CClosure) {
        L.stack[L.top] = new lobject.TValue(CT.LUA_TNIL, null);
        L.top++;
        assert(L.top <= L.ci.top, "stack overflow");
    } else {
        let lineinfo = f.p.lineinfo;
        let t = ltable.luaH_new(L);
        L.stack[L.top] = new lobject.TValue(CT.LUA_TTABLE, t);
        L.top++;
        assert(L.top <= L.ci.top, "stack overflow");
        let v = new lobject.TValue(CT.LUA_TBOOLEAN, true);
        for (let i = 0; i < lineinfo.length; i++)
            ltable.luaH_setint(t, lineinfo[i], v);
    }
};

const getfuncname = function(L, ci) {
    let r = {
        name: null,
        funcname: null
    };
    if (ci === null)
        return null;
    else if (ci.callstatus & lstate.CIST_FIN) {  /* is this a finalizer? */
        r.name = defs.to_luastring("__gc", true);
        r.funcname = defs.to_luastring("metamethod", true);  /* report it as such */
        return r;
    }
    /* calling function is a known Lua function? */
    else if (!(ci.callstatus & lstate.CIST_TAIL) && ci.previous.callstatus & lstate.CIST_LUA)
        return funcnamefromcode(L, ci.previous);
    else return null;  /* no way to find a name */
};

const auxgetinfo = function(L, what, ar, f, ci) {
    let status = 1;
    for (; what.length > 0; what = what.subarray(1)) {
        switch (what[0]) {
            case char['S']: {
                funcinfo(ar, f);
                break;
            }
            case char['l']: {
                ar.currentline = ci && ci.callstatus & lstate.CIST_LUA ? currentline(ci) : -1;
                break;
            }
            case char['u']: {
                ar.nups = f === null ? 0 : f.nupvalues;
                if (f === null || f instanceof lobject.CClosure) {
                    ar.isvararg = true;
                    ar.nparams = 0;
                } else {
                    ar.isvararg = f.p.is_vararg;
                    ar.nparams = f.p.numparams;
                }
                break;
            }
            case char['t']: {
                ar.istailcall = ci ? ci.callstatus & lstate.CIST_TAIL : 0;
                break;
            }
            case char['n']: {
                let r = getfuncname(L, ci);
                if (r === null) {
                    ar.namewhat = defs.to_luastring("", true);
                    ar.name = null;
                } else {
                    ar.namewhat = r.funcname;
                    ar.name = r.name;
                }
                break;
            }
            case char['L']:
            case char['f']:  /* handled by lua_getinfo */
                break;
            default: status = 0;  /* invalid option */
        }
    }

    return status;
};

const lua_getinfo = function(L, what, ar) {
    what = defs.from_userstring(what);
    let status, cl, ci, func;
    swapextra(L);
    if (what[0] === char['>']) {
        ci = null;
        func = L.stack[L.top - 1];
        assert(L, func.ttisfunction(), "function expected");
        what = what.subarray(1);  /* skip the '>' */
        L.top--;  /* pop function */
    } else {
        ci = ar.i_ci;
        func = ci.func;
        assert(ci.func.ttisfunction());
    }

    cl = func.ttisclosure() ? func.value : null;
    status = auxgetinfo(L, what, ar, cl, ci);
    if (defs.luastring_indexOf(what, char['f']) >= 0) {
        lobject.pushobj2s(L, func);
        assert(L.top <= L.ci.top, "stack overflow");
    }

    swapextra(L);
    if (defs.luastring_indexOf(what, char['L']) >= 0)
        collectvalidlines(L, cl);

    return status;
};

const kname = function(p, pc, c) {
    let r = {
        name: null,
        funcname: null
    };

    if (lopcodes.ISK(c)) {  /* is 'c' a constant? */
        let kvalue = p.k[lopcodes.INDEXK(c)];
        if (kvalue.ttisstring()) {  /* literal constant? */
            r.name = kvalue.svalue();  /* it is its own name */
            return r;
        }
        /* else no reasonable name found */
    } else {  /* 'c' is a register */
        let what = getobjname(p, pc, c); /* search for 'c' */
        if (what && what.funcname[0] === char['c']) {  /* found a constant name? */
            return what;  /* 'name' already filled */
        }
        /* else no reasonable name found */
    }
    r.name = defs.to_luastring("?", true);
    return r;  /* no reasonable name found */
};

const filterpc = function(pc, jmptarget) {
    if (pc < jmptarget)  /* is code conditional (inside a jump)? */
        return -1;  /* cannot know who sets that register */
    else return pc;  /* current position sets that register */
};

/*
** try to find last instruction before 'lastpc' that modified register 'reg'
*/
const findsetreg = function(p, lastpc, reg) {
    let setreg = -1;  /* keep last instruction that changed 'reg' */
    let jmptarget = 0;  /* any code before this address is conditional */
    let OCi = lopcodes.OpCodesI;
    for (let pc = 0; pc < lastpc; pc++) {
        let i = p.code[pc];
        let a = i.A;
        switch (i.opcode) {
            case OCi.OP_LOADNIL: {
                let b = i.B;
                if (a <= reg && reg <= a + b)  /* set registers from 'a' to 'a+b' */
                    setreg = filterpc(pc, jmptarget);
                break;
            }
            case OCi.OP_TFORCALL: {
                if (reg >= a + 2)  /* affect all regs above its base */
                    setreg = filterpc(pc, jmptarget);
                break;
            }
            case OCi.OP_CALL:
            case OCi.OP_TAILCALL: {
                if (reg >= a)  /* affect all registers above base */
                    setreg = filterpc(pc, jmptarget);
                break;
            }
            case OCi.OP_JMP: {
                let b = i.sBx;
                let dest = pc + 1 + b;
                /* jump is forward and do not skip 'lastpc'? */
                if (pc < dest && dest <= lastpc) {
                    if (dest > jmptarget)
                        jmptarget = dest;  /* update 'jmptarget' */
                }
                break;
            }
            default:
                if (lopcodes.testAMode(i.opcode) && reg === a)
                    setreg = filterpc(pc, jmptarget);
                break;
        }
    }

    return setreg;
};


const getobjname = function(p, lastpc, reg) {
    let r = {
        name: lfunc.luaF_getlocalname(p, reg + 1, lastpc),
        funcname: null
    };

    if (r.name) {  /* is a local? */
        r.funcname = defs.to_luastring("local", true);
        return r;
    }

    /* else try symbolic execution */
    let pc = findsetreg(p, lastpc, reg);
    let OCi = lopcodes.OpCodesI;
    if (pc !== -1) {  /* could find instruction? */
        let i = p.code[pc];
        switch (i.opcode) {
            case OCi.OP_MOVE: {
                let b = i.B;  /* move from 'b' to 'a' */
                if (b < i.A)
                    return getobjname(p, pc, b);  /* get name for 'b' */
                break;
            }
            case OCi.OP_GETTABUP:
            case OCi.OP_GETTABLE: {
                let k = i.C;  /* key index */
                let t = i.B;  /* table index */
                let vn = i.opcode === OCi.OP_GETTABLE ? lfunc.luaF_getlocalname(p, t + 1, pc) : upvalname(p, t);
                r.name = kname(p, pc, k).name;
                r.funcname = (vn && defs.luastring_eq(vn, llex.LUA_ENV)) ? defs.to_luastring("global", true) : defs.to_luastring("field", true);
                return r;
            }
            case OCi.OP_GETUPVAL: {
                r.name = upvalname(p, i.B);
                r.funcname = defs.to_luastring("upvalue", true);
                return r;
            }
            case OCi.OP_LOADK:
            case OCi.OP_LOADKX: {
                let b = i.opcode === OCi.OP_LOADK ? i.Bx : p.code[pc + 1].Ax;
                if (p.k[b].ttisstring()) {
                    r.name = p.k[b].svalue();
                    r.funcname = defs.to_luastring("constant", true);
                    return r;
                }
                break;
            }
            case OCi.OP_SELF: {
                let k = i.C;
                r.name = kname(p, pc, k).name;
                r.funcname = defs.to_luastring("method", true);
                return r;
            }
            default: break;
        }
    }

    return null;
};

/*
** Try to find a name for a function based on the code that called it.
** (Only works when function was called by a Lua function.)
** Returns what the name is (e.g., "for iterator", "method",
** "metamethod") and sets '*name' to point to the name.
*/
const funcnamefromcode = function(L, ci) {
    let r = {
        name: null,
        funcname: null
    };

    let tm = 0;  /* (initial value avoids warnings) */
    let p = ci.func.value.p;  /* calling function */
    let pc = currentpc(ci);  /* calling instruction index */
    let i = p.code[pc];  /* calling instruction */
    let OCi = lopcodes.OpCodesI;

    if (ci.callstatus & lstate.CIST_HOOKED) {
        r.name = defs.to_luastring("?", true);
        r.funcname = defs.to_luastring("hook", true);
        return r;
    }

    switch (i.opcode) {
        case OCi.OP_CALL:
        case OCi.OP_TAILCALL:
            return getobjname(p, pc, i.A);  /* get function name */
        case OCi.OP_TFORCALL:
            r.name = defs.to_luastring("for iterator", true);
            r.funcname = defs.to_luastring("for iterator", true);
            return r;
        /* other instructions can do calls through metamethods */
        case OCi.OP_SELF:
        case OCi.OP_GETTABUP:
        case OCi.OP_GETTABLE:
            tm = ltm.TMS.TM_INDEX;
            break;
        case OCi.OP_SETTABUP:
        case OCi.OP_SETTABLE:
            tm = ltm.TMS.TM_NEWINDEX;
            break;
        case OCi.OP_ADD:    tm = ltm.TMS.TM_ADD;    break;
        case OCi.OP_SUB:    tm = ltm.TMS.TM_SUB;    break;
        case OCi.OP_MUL:    tm = ltm.TMS.TM_MUL;    break;
        case OCi.OP_MOD:    tm = ltm.TMS.TM_MOD;    break;
        case OCi.OP_POW:    tm = ltm.TMS.TM_POW;    break;
        case OCi.OP_DIV:    tm = ltm.TMS.TM_DIV;    break;
        case OCi.OP_IDIV:   tm = ltm.TMS.TM_IDIV;   break;
        case OCi.OP_BAND:   tm = ltm.TMS.TM_BAND;   break;
        case OCi.OP_BOR:    tm = ltm.TMS.TM_BOR;    break;
        case OCi.OP_BXOR:   tm = ltm.TMS.TM_BXOR;   break;
        case OCi.OP_SHL:    tm = ltm.TMS.TM_SHL;    break;
        case OCi.OP_SHR:    tm = ltm.TMS.TM_SHR;    break;
        case OCi.OP_UNM:    tm = ltm.TMS.TM_UNM;    break;
        case OCi.OP_BNOT:   tm = ltm.TMS.TM_BNOT;   break;
        case OCi.OP_LEN:    tm = ltm.TMS.TM_LEN;    break;
        case OCi.OP_CONCAT: tm = ltm.TMS.TM_CONCAT; break;
        case OCi.OP_EQ:     tm = ltm.TMS.TM_EQ;     break;
        case OCi.OP_LT:     tm = ltm.TMS.TM_LT;     break;
        case OCi.OP_LE:     tm = ltm.TMS.TM_LE;     break;
        default:
            return null;  /* cannot find a reasonable name */
    }

    r.name = L.l_G.tmname[tm].getstr();
    r.funcname = defs.to_luastring("metamethod", true);
    return r;
};

const isinstack = function(L, ci, o) {
    for (let i = ci.l_base; i < ci.top; i++) {
        if (L.stack[i] === o)
            return i;
    }

    return false;
};

/*
** Checks whether value 'o' came from an upvalue. (That can only happen
** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on
** upvalues.)
*/
const getupvalname = function(L, ci, o) {
    let c = ci.func.value;
    for (let i = 0; i < c.nupvalues; i++) {
        if (c.upvals[i].v === o) {
            return {
                name: upvalname(c.p, i),
                funcname: defs.to_luastring('upvalue', true)
            };
        }
    }

    return null;
};

const varinfo = function(L, o) {
    let ci = L.ci;
    let kind = null;
    if (ci.callstatus & lstate.CIST_LUA) {
        kind = getupvalname(L, ci, o);  /* check whether 'o' is an upvalue */
        let stkid = isinstack(L, ci, o);
        if (!kind && stkid)  /* no? try a register */
            kind = getobjname(ci.func.value.p, currentpc(ci), stkid - ci.l_base);
    }

    return kind ? lobject.luaO_pushfstring(L, defs.to_luastring(" (%s '%s')", true), kind.funcname, kind.name) : defs.to_luastring("", true);
};

const luaG_typeerror = function(L, o, op) {
    let t = ltm.luaT_objtypename(L, o);
    luaG_runerror(L, defs.to_luastring("attempt to %s a %s value%s", true), op, t, varinfo(L, o));
};

const luaG_concaterror = function(L, p1, p2) {
    if (p1.ttisstring() || lvm.cvt2str(p1)) p1 = p2;
    luaG_typeerror(L, p1, defs.to_luastring('concatenate', true));
};

/*
** Error when both values are convertible to numbers, but not to integers
*/
const luaG_opinterror = function(L, p1, p2, msg) {
    if (lvm.tonumber(p1) === false)
        p2 = p1;
    luaG_typeerror(L, p2, msg);
};

const luaG_ordererror = function(L, p1, p2) {
    let t1 = ltm.luaT_objtypename(L, p1);
    let t2 = ltm.luaT_objtypename(L, p2);
    if (defs.luastring_eq(t1, t2))
        luaG_runerror(L, defs.to_luastring("attempt to compare two %s values", true), t1);
    else
        luaG_runerror(L, defs.to_luastring("attempt to compare %s with %s", true), t1, t2);
};

/* add src:line information to 'msg' */
const luaG_addinfo = function(L, msg, src, line) {
    let buff;
    if (src)
        buff = lobject.luaO_chunkid(src.getstr(), luaconf.LUA_IDSIZE);
    else
        buff = defs.to_luastring("?", true);

    return lobject.luaO_pushfstring(L, defs.to_luastring("%s:%d: %s", true), buff, line, msg);
};

const luaG_runerror = function(L, fmt, ...argp) {
    let ci = L.ci;
    let msg = lobject.luaO_pushvfstring(L, fmt, argp);
    if (ci.callstatus & lstate.CIST_LUA)  /* if Lua function, add source:line information */
        luaG_addinfo(L, msg, ci.func.value.p.source, currentline(ci));
    luaG_errormsg(L);
};

const luaG_errormsg = function(L) {
    if (L.errfunc !== 0) {  /* is there an error handling function? */
        let errfunc = L.errfunc;
        lobject.pushobj2s(L, L.stack[L.top - 1]); /* move argument */
        lobject.setobjs2s(L, L.top - 2, errfunc); /* push function */
        ldo.luaD_callnoyield(L, L.top - 2, 1);
    }

    ldo.luaD_throw(L, TS.LUA_ERRRUN);
};

/*
** Error when both values are convertible to numbers, but not to integers
*/
const luaG_tointerror = function(L, p1, p2) {
    let temp = lvm.tointeger(p1);
    if (temp === false)
        p2 = p1;
    luaG_runerror(L, defs.to_luastring("number%s has no integer representation", true), varinfo(L, p2));
};

const luaG_traceexec = function(L) {
    let ci = L.ci;
    let mask = L.hookmask;
    let counthook = (--L.hookcount === 0 && (mask & defs.LUA_MASKCOUNT));
    if (counthook)
        L.hookcount = L.basehookcount;  /* reset count */
    else if (!(mask & defs.LUA_MASKLINE))
        return;  /* no line hook and count != 0; nothing to be done */
    if (ci.callstatus & lstate.CIST_HOOKYIELD) {  /* called hook last time? */
        ci.callstatus &= ~lstate.CIST_HOOKYIELD;  /* erase mark */
        return;  /* do not call hook again (VM yielded, so it did not move) */
    }
    if (counthook)
        ldo.luaD_hook(L, defs.LUA_HOOKCOUNT, -1);  /* call count hook */
    if (mask & defs.LUA_MASKLINE) {
        let p = ci.func.value.p;
        let npc = ci.l_savedpc - 1; // pcRel(ci.u.l.savedpc, p);
        let newline = p.lineinfo.length !== 0 ? p.lineinfo[npc] : -1;
        if (npc === 0 ||  /* call linehook when enter a new function, */
            ci.l_savedpc <= L.oldpc ||  /* when jump back (loop), or when */
            newline !== (p.lineinfo.length !== 0 ? p.lineinfo[L.oldpc - 1] : -1))  /* enter a new line */
            ldo.luaD_hook(L, defs.LUA_HOOKLINE, newline);  /* call line hook */
    }
    L.oldpc = ci.l_savedpc;
    if (L.status === TS.LUA_YIELD) {  /* did hook yield? */
        if (counthook)
            L.hookcount = 1;  /* undo decrement to zero */
        ci.l_savedpc--;  /* undo increment (resume will increment it again) */
        ci.callstatus |= lstate.CIST_HOOKYIELD;  /* mark that it yielded */
        ci.funcOff = L.top - 1;  /* protect stack below results */
        ci.func = L.stack[ci.funcOff];
        ldo.luaD_throw(L, TS.LUA_YIELD);
    }
};

module.exports.luaG_addinfo     = luaG_addinfo;
module.exports.luaG_concaterror = luaG_concaterror;
module.exports.luaG_errormsg    = luaG_errormsg;
module.exports.luaG_opinterror  = luaG_opinterror;
module.exports.luaG_ordererror  = luaG_ordererror;
module.exports.luaG_runerror    = luaG_runerror;
module.exports.luaG_tointerror  = luaG_tointerror;
module.exports.luaG_traceexec   = luaG_traceexec;
module.exports.luaG_typeerror   = luaG_typeerror;
module.exports.lua_gethook      = lua_gethook;
module.exports.lua_gethookcount = lua_gethookcount;
module.exports.lua_gethookmask  = lua_gethookmask;
module.exports.lua_getinfo      = lua_getinfo;
module.exports.lua_getlocal     = lua_getlocal;
module.exports.lua_getstack     = lua_getstack;
module.exports.lua_sethook      = lua_sethook;
module.exports.lua_setlocal     = lua_setlocal;