Line data Source code
1 : /*
2 : ** $Id: ldebug.c,v 2.121.1.2 2017/07/10 17:21:50 roberto Exp $
3 : ** Debug Interface
4 : ** See Copyright Notice in lua.h
5 : */
6 :
7 : #define ldebug_c
8 : #define LUA_CORE
9 :
10 : #include "lprefix.h"
11 :
12 :
13 : #include <stdarg.h>
14 : #include <stddef.h>
15 : #include <string.h>
16 :
17 : #include "lua.h"
18 :
19 : #include "lapi.h"
20 : #include "lcode.h"
21 : #include "ldebug.h"
22 : #include "ldo.h"
23 : #include "lfunc.h"
24 : #include "lobject.h"
25 : #include "lopcodes.h"
26 : #include "lstate.h"
27 : #include "lstring.h"
28 : #include "ltable.h"
29 : #include "ltm.h"
30 : #include "lvm.h"
31 :
32 : // lua code does lots of casting, these warnings are not helpful
33 : #pragma GCC diagnostic ignored "-Wcast-align"
34 :
35 : #define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_TCCL)
36 :
37 :
38 : /* Active Lua function (given call info) */
39 : #define ci_func(ci) (clLvalue((ci)->func))
40 :
41 :
42 : static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
43 : const char **name);
44 :
45 :
46 23 : static int currentpc (CallInfo *ci) {
47 : lua_assert(isLua(ci));
48 23 : return pcRel(ci->u.l.savedpc, ci_func(ci)->p);
49 : }
50 :
51 :
52 15 : static int currentline (CallInfo *ci) {
53 15 : return getfuncline(ci_func(ci)->p, currentpc(ci));
54 : }
55 :
56 :
57 : /*
58 : ** If function yielded, its 'func' can be in the 'extra' field. The
59 : ** next function restores 'func' to its correct value for debugging
60 : ** purposes. (It exchanges 'func' and 'extra'; so, when called again,
61 : ** after debugging, it also "re-restores" ** 'func' to its altered value.
62 : */
63 164 : static void swapextra (lua_State *L) {
64 164 : if (L->status == LUA_YIELD) {
65 0 : CallInfo *ci = L->ci; /* get function that yielded */
66 0 : StkId temp = ci->func; /* exchange its 'func' and 'extra' values */
67 0 : ci->func = restorestack(L, ci->extra);
68 0 : ci->extra = savestack(L, temp);
69 : }
70 164 : }
71 :
72 :
73 : /*
74 : ** This function can be called asynchronously (e.g. during a signal).
75 : ** Fields 'oldpc', 'basehookcount', and 'hookcount' (set by
76 : ** 'resethookcount') are for debug only, and it is no problem if they
77 : ** get arbitrary values (causes at most one wrong hook call). 'hookmask'
78 : ** is an atomic value. We assume that pointers are atomic too (e.g., gcc
79 : ** ensures that for all platforms where it runs). Moreover, 'hook' is
80 : ** always checked before being called (see 'luaD_hook').
81 : */
82 90394 : LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
83 90394 : if (func == NULL || mask == 0) { /* turn off hooks? */
84 0 : mask = 0;
85 0 : func = NULL;
86 : }
87 90394 : if (isLua(L->ci))
88 1 : L->oldpc = L->ci->u.l.savedpc;
89 90394 : L->hook = func;
90 90394 : L->basehookcount = count;
91 90394 : resethookcount(L);
92 90394 : L->hookmask = cast_byte(mask);
93 90394 : }
94 :
95 :
96 0 : LUA_API lua_Hook lua_gethook (lua_State *L) {
97 0 : return L->hook;
98 : }
99 :
100 :
101 0 : LUA_API int lua_gethookmask (lua_State *L) {
102 0 : return L->hookmask;
103 : }
104 :
105 :
106 0 : LUA_API int lua_gethookcount (lua_State *L) {
107 0 : return L->basehookcount;
108 : }
109 :
110 :
111 65 : LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
112 : int status;
113 : CallInfo *ci;
114 65 : if (level < 0) return 0; /* invalid (negative) level */
115 : lua_lock(L);
116 113 : for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)
117 48 : level--;
118 65 : if (level == 0 && ci != &L->base_ci) { /* level found? */
119 65 : status = 1;
120 65 : ar->i_ci = ci;
121 : }
122 0 : else status = 0; /* no such level */
123 : lua_unlock(L);
124 65 : return status;
125 : }
126 :
127 :
128 0 : static const char *upvalname (Proto *p, int uv) {
129 0 : TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);
130 0 : if (s == NULL) return "?";
131 0 : else return getstr(s);
132 : }
133 :
134 :
135 0 : static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
136 0 : int nparams = clLvalue(ci->func)->p->numparams;
137 0 : int nvararg = cast_int(ci->u.l.base - ci->func) - nparams;
138 0 : if (n <= -nvararg)
139 0 : return NULL; /* no such vararg */
140 : else {
141 0 : *pos = ci->func + nparams - n;
142 0 : return "(*vararg)"; /* generic name for any vararg */
143 : }
144 : }
145 :
146 :
147 0 : static const char *findlocal (lua_State *L, CallInfo *ci, int n,
148 : StkId *pos) {
149 0 : const char *name = NULL;
150 : StkId base;
151 0 : if (isLua(ci)) {
152 0 : if (n < 0) /* access to vararg values? */
153 0 : return findvararg(ci, n, pos);
154 : else {
155 0 : base = ci->u.l.base;
156 0 : name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
157 : }
158 : }
159 : else
160 0 : base = ci->func + 1;
161 0 : if (name == NULL) { /* no 'standard' name? */
162 0 : StkId limit = (ci == L->ci) ? L->top : ci->next->func;
163 0 : if (limit - base >= n && n > 0) /* is 'n' inside 'ci' stack? */
164 0 : name = "(*temporary)"; /* generic name for any valid slot */
165 : else
166 0 : return NULL; /* no name */
167 : }
168 0 : *pos = base + (n - 1);
169 0 : return name;
170 : }
171 :
172 :
173 0 : LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
174 : const char *name;
175 : lua_lock(L);
176 0 : swapextra(L);
177 0 : if (ar == NULL) { /* information about non-active function? */
178 0 : if (!isLfunction(L->top - 1)) /* not a Lua function? */
179 0 : name = NULL;
180 : else /* consider live variables at function start (parameters) */
181 0 : name = luaF_getlocalname(clLvalue(L->top - 1)->p, n, 0);
182 : }
183 : else { /* active function; get information through 'ar' */
184 0 : StkId pos = NULL; /* to avoid warnings */
185 0 : name = findlocal(L, ar->i_ci, n, &pos);
186 0 : if (name) {
187 0 : setobj2s(L, L->top, pos);
188 0 : api_incr_top(L);
189 : }
190 : }
191 0 : swapextra(L);
192 : lua_unlock(L);
193 0 : return name;
194 : }
195 :
196 :
197 0 : LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
198 0 : StkId pos = NULL; /* to avoid warnings */
199 : const char *name;
200 : lua_lock(L);
201 0 : swapextra(L);
202 0 : name = findlocal(L, ar->i_ci, n, &pos);
203 0 : if (name) {
204 0 : setobjs2s(L, pos, L->top - 1);
205 0 : L->top--; /* pop value */
206 : }
207 0 : swapextra(L);
208 : lua_unlock(L);
209 0 : return name;
210 : }
211 :
212 :
213 48 : static void funcinfo (lua_Debug *ar, Closure *cl) {
214 48 : if (noLuaClosure(cl)) {
215 41 : ar->source = "=[C]";
216 41 : ar->linedefined = -1;
217 41 : ar->lastlinedefined = -1;
218 41 : ar->what = "C";
219 : }
220 : else {
221 7 : Proto *p = cl->l.p;
222 7 : ar->source = p->source ? getstr(p->source) : "=?";
223 7 : ar->linedefined = p->linedefined;
224 7 : ar->lastlinedefined = p->lastlinedefined;
225 7 : ar->what = (ar->linedefined == 0) ? "main" : "Lua";
226 : }
227 48 : luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
228 48 : }
229 :
230 :
231 0 : static void collectvalidlines (lua_State *L, Closure *f) {
232 0 : if (noLuaClosure(f)) {
233 0 : setnilvalue(L->top);
234 0 : api_incr_top(L);
235 : }
236 : else {
237 : int i;
238 : TValue v;
239 0 : int *lineinfo = f->l.p->lineinfo;
240 0 : Table *t = luaH_new(L); /* new table to store active lines */
241 0 : sethvalue(L, L->top, t); /* push it on stack */
242 0 : api_incr_top(L);
243 0 : setbvalue(&v, 1); /* boolean 'true' to be the value of all indices */
244 0 : for (i = 0; i < f->l.p->sizelineinfo; i++) /* for all lines with code */
245 0 : luaH_setint(L, t, lineinfo[i], &v); /* table[line] = true */
246 : }
247 0 : }
248 :
249 :
250 17 : static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
251 17 : if (ci == NULL) /* no 'ci'? */
252 0 : return NULL; /* no info */
253 17 : else if (ci->callstatus & CIST_FIN) { /* is this a finalizer? */
254 0 : *name = "__gc";
255 0 : return "metamethod"; /* report it as such */
256 : }
257 : /* calling function is a known Lua function? */
258 17 : else if (!(ci->callstatus & CIST_TAIL) && isLua(ci->previous))
259 0 : return funcnamefromcode(L, ci->previous, name);
260 17 : else return NULL; /* no way to find a name */
261 : }
262 :
263 :
264 82 : static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
265 : Closure *f, CallInfo *ci) {
266 82 : int status = 1;
267 212 : for (; *what; what++) {
268 130 : switch (*what) {
269 48 : case 'S': {
270 48 : funcinfo(ar, f);
271 48 : break;
272 : }
273 48 : case 'l': {
274 48 : ar->currentline = (ci && isLua(ci)) ? currentline(ci) : -1;
275 48 : break;
276 : }
277 0 : case 'u': {
278 0 : ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
279 0 : if (noLuaClosure(f)) {
280 0 : ar->isvararg = 1;
281 0 : ar->nparams = 0;
282 : }
283 : else {
284 0 : ar->isvararg = f->l.p->is_vararg;
285 0 : ar->nparams = f->l.p->numparams;
286 : }
287 0 : break;
288 : }
289 0 : case 't': {
290 0 : ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;
291 0 : break;
292 : }
293 17 : case 'n': {
294 17 : ar->namewhat = getfuncname(L, ci, &ar->name);
295 17 : if (ar->namewhat == NULL) {
296 17 : ar->namewhat = ""; /* not found */
297 17 : ar->name = NULL;
298 : }
299 17 : break;
300 : }
301 17 : case 'L':
302 : case 'f': /* handled by lua_getinfo */
303 17 : break;
304 0 : default: status = 0; /* invalid option */
305 : }
306 : }
307 82 : return status;
308 : }
309 :
310 :
311 82 : LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
312 : int status;
313 : Closure *cl;
314 : CallInfo *ci;
315 : StkId func;
316 : lua_lock(L);
317 82 : swapextra(L);
318 82 : if (*what == '>') {
319 0 : ci = NULL;
320 0 : func = L->top - 1;
321 : api_check(L, ttisfunction(func), "function expected");
322 0 : what++; /* skip the '>' */
323 0 : L->top--; /* pop function */
324 : }
325 : else {
326 82 : ci = ar->i_ci;
327 82 : func = ci->func;
328 : lua_assert(ttisfunction(ci->func));
329 : }
330 82 : cl = ttisclosure(func) ? clvalue(func) : NULL;
331 82 : status = auxgetinfo(L, what, ar, cl, ci);
332 82 : if (strchr(what, 'f')) {
333 17 : setobjs2s(L, L->top, func);
334 17 : api_incr_top(L);
335 : }
336 82 : swapextra(L); /* correct before option 'L', which can raise a mem. error */
337 82 : if (strchr(what, 'L'))
338 0 : collectvalidlines(L, cl);
339 : lua_unlock(L);
340 82 : return status;
341 : }
342 :
343 :
344 : /*
345 : ** {======================================================
346 : ** Symbolic Execution
347 : ** =======================================================
348 : */
349 :
350 : static const char *getobjname (Proto *p, int lastpc, int reg,
351 : const char **name);
352 :
353 :
354 : /*
355 : ** find a "name" for the RK value 'c'
356 : */
357 0 : static void kname (Proto *p, int pc, int c, const char **name) {
358 0 : if (ISK(c)) { /* is 'c' a constant? */
359 0 : TValue *kvalue = &p->k[INDEXK(c)];
360 0 : if (ttisstring(kvalue)) { /* literal constant? */
361 0 : *name = svalue(kvalue); /* it is its own name */
362 0 : return;
363 : }
364 : /* else no reasonable name found */
365 : }
366 : else { /* 'c' is a register */
367 0 : const char *what = getobjname(p, pc, c, name); /* search for 'c' */
368 0 : if (what && *what == 'c') { /* found a constant name? */
369 0 : return; /* 'name' already filled */
370 : }
371 : /* else no reasonable name found */
372 : }
373 0 : *name = "?"; /* no reasonable name found */
374 : }
375 :
376 :
377 0 : static int filterpc (int pc, int jmptarget) {
378 0 : if (pc < jmptarget) /* is code conditional (inside a jump)? */
379 0 : return -1; /* cannot know who sets that register */
380 0 : else return pc; /* current position sets that register */
381 : }
382 :
383 :
384 : /*
385 : ** try to find last instruction before 'lastpc' that modified register 'reg'
386 : */
387 0 : static int findsetreg (Proto *p, int lastpc, int reg) {
388 : int pc;
389 0 : int setreg = -1; /* keep last instruction that changed 'reg' */
390 0 : int jmptarget = 0; /* any code before this address is conditional */
391 0 : for (pc = 0; pc < lastpc; pc++) {
392 0 : Instruction i = p->code[pc];
393 0 : OpCode op = GET_OPCODE(i);
394 0 : int a = GETARG_A(i);
395 0 : switch (op) {
396 0 : case OP_LOADNIL: {
397 0 : int b = GETARG_B(i);
398 0 : if (a <= reg && reg <= a + b) /* set registers from 'a' to 'a+b' */
399 0 : setreg = filterpc(pc, jmptarget);
400 0 : break;
401 : }
402 0 : case OP_TFORCALL: {
403 0 : if (reg >= a + 2) /* affect all regs above its base */
404 0 : setreg = filterpc(pc, jmptarget);
405 0 : break;
406 : }
407 0 : case OP_CALL:
408 : case OP_TAILCALL: {
409 0 : if (reg >= a) /* affect all registers above base */
410 0 : setreg = filterpc(pc, jmptarget);
411 0 : break;
412 : }
413 0 : case OP_JMP: {
414 0 : int b = GETARG_sBx(i);
415 0 : int dest = pc + 1 + b;
416 : /* jump is forward and do not skip 'lastpc'? */
417 0 : if (pc < dest && dest <= lastpc) {
418 0 : if (dest > jmptarget)
419 0 : jmptarget = dest; /* update 'jmptarget' */
420 : }
421 0 : break;
422 : }
423 0 : default:
424 0 : if (testAMode(op) && reg == a) /* any instruction that set A */
425 0 : setreg = filterpc(pc, jmptarget);
426 0 : break;
427 : }
428 : }
429 0 : return setreg;
430 : }
431 :
432 :
433 8 : static const char *getobjname (Proto *p, int lastpc, int reg,
434 : const char **name) {
435 : int pc;
436 8 : *name = luaF_getlocalname(p, reg + 1, lastpc);
437 8 : if (*name) /* is a local? */
438 8 : return "local";
439 : /* else try symbolic execution */
440 0 : pc = findsetreg(p, lastpc, reg);
441 0 : if (pc != -1) { /* could find instruction? */
442 0 : Instruction i = p->code[pc];
443 0 : OpCode op = GET_OPCODE(i);
444 0 : switch (op) {
445 0 : case OP_MOVE: {
446 0 : int b = GETARG_B(i); /* move from 'b' to 'a' */
447 0 : if (b < GETARG_A(i))
448 0 : return getobjname(p, pc, b, name); /* get name for 'b' */
449 0 : break;
450 : }
451 0 : case OP_GETTABUP:
452 : case OP_GETTABLE: {
453 0 : int k = GETARG_C(i); /* key index */
454 0 : int t = GETARG_B(i); /* table index */
455 0 : const char *vn = (op == OP_GETTABLE) /* name of indexed variable */
456 0 : ? luaF_getlocalname(p, t + 1, pc)
457 0 : : upvalname(p, t);
458 0 : kname(p, pc, k, name);
459 0 : return (vn && strcmp(vn, LUA_ENV) == 0) ? "global" : "field";
460 : }
461 0 : case OP_GETUPVAL: {
462 0 : *name = upvalname(p, GETARG_B(i));
463 0 : return "upvalue";
464 : }
465 0 : case OP_LOADK:
466 : case OP_LOADKX: {
467 0 : int b = (op == OP_LOADK) ? GETARG_Bx(i)
468 0 : : GETARG_Ax(p->code[pc + 1]);
469 0 : if (ttisstring(&p->k[b])) {
470 0 : *name = svalue(&p->k[b]);
471 0 : return "constant";
472 : }
473 0 : break;
474 : }
475 0 : case OP_SELF: {
476 0 : int k = GETARG_C(i); /* key index */
477 0 : kname(p, pc, k, name);
478 0 : return "method";
479 : }
480 0 : default: break; /* go through to return NULL */
481 : }
482 : }
483 0 : return NULL; /* could not find reasonable name */
484 : }
485 :
486 :
487 : /*
488 : ** Try to find a name for a function based on the code that called it.
489 : ** (Only works when function was called by a Lua function.)
490 : ** Returns what the name is (e.g., "for iterator", "method",
491 : ** "metamethod") and sets '*name' to point to the name.
492 : */
493 0 : static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
494 : const char **name) {
495 0 : TMS tm = (TMS)0; /* (initial value avoids warnings) */
496 0 : Proto *p = ci_func(ci)->p; /* calling function */
497 0 : int pc = currentpc(ci); /* calling instruction index */
498 0 : Instruction i = p->code[pc]; /* calling instruction */
499 0 : if (ci->callstatus & CIST_HOOKED) { /* was it called inside a hook? */
500 0 : *name = "?";
501 0 : return "hook";
502 : }
503 0 : switch (GET_OPCODE(i)) {
504 0 : case OP_CALL:
505 : case OP_TAILCALL:
506 0 : return getobjname(p, pc, GETARG_A(i), name); /* get function name */
507 0 : case OP_TFORCALL: { /* for iterator */
508 0 : *name = "for iterator";
509 0 : return "for iterator";
510 : }
511 : /* other instructions can do calls through metamethods */
512 0 : case OP_SELF: case OP_GETTABUP: case OP_GETTABLE:
513 0 : tm = TM_INDEX;
514 0 : break;
515 0 : case OP_SETTABUP: case OP_SETTABLE:
516 0 : tm = TM_NEWINDEX;
517 0 : break;
518 0 : case OP_ADD: case OP_SUB: case OP_MUL: case OP_MOD:
519 : case OP_POW: case OP_DIV: case OP_IDIV: case OP_BAND:
520 : case OP_BOR: case OP_BXOR: case OP_SHL: case OP_SHR: {
521 0 : int offset = cast_int(GET_OPCODE(i)) - cast_int(OP_ADD); /* ORDER OP */
522 0 : tm = cast(TMS, offset + cast_int(TM_ADD)); /* ORDER TM */
523 0 : break;
524 : }
525 0 : case OP_UNM: tm = TM_UNM; break;
526 0 : case OP_BNOT: tm = TM_BNOT; break;
527 0 : case OP_LEN: tm = TM_LEN; break;
528 0 : case OP_CONCAT: tm = TM_CONCAT; break;
529 0 : case OP_EQ: tm = TM_EQ; break;
530 0 : case OP_LT: tm = TM_LT; break;
531 0 : case OP_LE: tm = TM_LE; break;
532 0 : default:
533 0 : return NULL; /* cannot find a reasonable name */
534 : }
535 0 : *name = getstr(G(L)->tmname[tm]);
536 0 : return "metamethod";
537 : }
538 :
539 : /* }====================================================== */
540 :
541 :
542 :
543 : /*
544 : ** The subtraction of two potentially unrelated pointers is
545 : ** not ISO C, but it should not crash a program; the subsequent
546 : ** checks are ISO C and ensure a correct result.
547 : */
548 8 : static int isinstack (CallInfo *ci, const TValue *o) {
549 8 : ptrdiff_t i = o - ci->u.l.base;
550 8 : return (0 <= i && i < (ci->top - ci->u.l.base) && ci->u.l.base + i == o);
551 : }
552 :
553 :
554 : /*
555 : ** Checks whether value 'o' came from an upvalue. (That can only happen
556 : ** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on
557 : ** upvalues.)
558 : */
559 8 : static const char *getupvalname (CallInfo *ci, const TValue *o,
560 : const char **name) {
561 8 : LClosure *c = ci_func(ci);
562 : int i;
563 8 : for (i = 0; i < c->nupvalues; i++) {
564 0 : if (c->upvals[i]->v == o) {
565 0 : *name = upvalname(c->p, i);
566 0 : return "upvalue";
567 : }
568 : }
569 8 : return NULL;
570 : }
571 :
572 :
573 10 : static const char *varinfo (lua_State *L, const TValue *o) {
574 10 : const char *name = NULL; /* to avoid warnings */
575 10 : CallInfo *ci = L->ci;
576 10 : const char *kind = NULL;
577 10 : if (isLua(ci)) {
578 8 : kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */
579 8 : if (!kind && isinstack(ci, o)) /* no? try a register */
580 8 : kind = getobjname(ci_func(ci)->p, currentpc(ci),
581 8 : cast_int(o - ci->u.l.base), &name);
582 : }
583 10 : return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
584 : }
585 :
586 :
587 2 : l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
588 2 : const char *t = luaT_objtypename(L, o);
589 2 : luaG_runerror(L, "attempt to %s a %s value%s", op, t, varinfo(L, o));
590 : }
591 :
592 :
593 0 : l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {
594 0 : if (ttisstring(p1) || cvt2str(p1)) p1 = p2;
595 0 : luaG_typeerror(L, p1, "concatenate");
596 : }
597 :
598 :
599 0 : l_noret luaG_opinterror (lua_State *L, const TValue *p1,
600 : const TValue *p2, const char *msg) {
601 : lua_Number temp;
602 0 : if (!tonumber(p1, &temp)) /* first operand is wrong? */
603 0 : p2 = p1; /* now second is wrong */
604 0 : luaG_typeerror(L, p2, msg);
605 : }
606 :
607 :
608 : /*
609 : ** Error when both values are convertible to numbers, but not to integers
610 : */
611 8 : l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {
612 : lua_Integer temp;
613 8 : if (!tointeger(p1, &temp))
614 8 : p2 = p1;
615 8 : luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));
616 : }
617 :
618 :
619 0 : l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
620 0 : const char *t1 = luaT_objtypename(L, p1);
621 0 : const char *t2 = luaT_objtypename(L, p2);
622 0 : if (strcmp(t1, t2) == 0)
623 0 : luaG_runerror(L, "attempt to compare two %s values", t1);
624 : else
625 0 : luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
626 : }
627 :
628 :
629 : /* add src:line information to 'msg' */
630 8 : const char *luaG_addinfo (lua_State *L, const char *msg, TString *src,
631 : int line) {
632 : char buff[LUA_IDSIZE];
633 8 : if (src)
634 8 : luaO_chunkid(buff, getstr(src), LUA_IDSIZE);
635 : else { /* no source available; use "?" instead */
636 0 : buff[0] = '?'; buff[1] = '\0';
637 : }
638 8 : return luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
639 : }
640 :
641 :
642 58 : l_noret luaG_errormsg (lua_State *L) {
643 58 : if (L->errfunc != 0) { /* is there an error handling function? */
644 0 : StkId errfunc = restorestack(L, L->errfunc);
645 0 : setobjs2s(L, L->top, L->top - 1); /* move argument */
646 0 : setobjs2s(L, L->top - 1, errfunc); /* push function */
647 0 : L->top++; /* assume EXTRA_STACK */
648 0 : luaD_callnoyield(L, L->top - 2, 1); /* call it */
649 : }
650 58 : luaD_throw(L, LUA_ERRRUN);
651 : }
652 :
653 :
654 10 : l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
655 10 : CallInfo *ci = L->ci;
656 : const char *msg;
657 : va_list argp;
658 10 : luaC_checkGC(L); /* error message uses memory */
659 10 : va_start(argp, fmt);
660 10 : msg = luaO_pushvfstring(L, fmt, argp); /* format message */
661 10 : va_end(argp);
662 10 : if (isLua(ci)) /* if Lua function, add source:line information */
663 8 : luaG_addinfo(L, msg, ci_func(ci)->p->source, currentline(ci));
664 10 : luaG_errormsg(L);
665 : }
666 :
667 :
668 47089580 : void luaG_traceexec (lua_State *L) {
669 47089580 : CallInfo *ci = L->ci;
670 47089580 : lu_byte mask = L->hookmask;
671 47089580 : int counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
672 47089580 : if (counthook)
673 1 : resethookcount(L); /* reset count */
674 47089579 : else if (!(mask & LUA_MASKLINE))
675 47089579 : return; /* no line hook and count != 0; nothing to be done */
676 1 : if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
677 0 : ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
678 0 : return; /* do not call hook again (VM yielded, so it did not move) */
679 : }
680 1 : if (counthook)
681 1 : luaD_hook(L, LUA_HOOKCOUNT, -1); /* call count hook */
682 0 : if (mask & LUA_MASKLINE) {
683 0 : Proto *p = ci_func(ci)->p;
684 0 : int npc = pcRel(ci->u.l.savedpc, p);
685 0 : int newline = getfuncline(p, npc);
686 0 : if (npc == 0 || /* call linehook when enter a new function, */
687 0 : ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */
688 0 : newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */
689 0 : luaD_hook(L, LUA_HOOKLINE, newline); /* call line hook */
690 : }
691 0 : L->oldpc = ci->u.l.savedpc;
692 0 : if (L->status == LUA_YIELD) { /* did hook yield? */
693 0 : if (counthook)
694 0 : L->hookcount = 1; /* undo decrement to zero */
695 0 : ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
696 0 : ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
697 0 : ci->func = L->top - 1; /* protect stack below results */
698 0 : luaD_throw(L, LUA_YIELD);
699 : }
700 : }
701 :
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