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 :
33 :
34 : #define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_TCCL)
35 :
36 :
37 : /* Active Lua function (given call info) */
38 : #define ci_func(ci) (clLvalue((ci)->func))
39 :
40 :
41 : static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
42 : const char **name);
43 :
44 :
45 589 : static int currentpc (CallInfo *ci) {
46 : lua_assert(isLua(ci));
47 589 : return pcRel(ci->u.l.savedpc, ci_func(ci)->p);
48 : }
49 :
50 :
51 407 : static int currentline (CallInfo *ci) {
52 407 : return getfuncline(ci_func(ci)->p, currentpc(ci));
53 : }
54 :
55 :
56 : /*
57 : ** If function yielded, its 'func' can be in the 'extra' field. The
58 : ** next function restores 'func' to its correct value for debugging
59 : ** purposes. (It exchanges 'func' and 'extra'; so, when called again,
60 : ** after debugging, it also "re-restores" ** 'func' to its altered value.
61 : */
62 566 : static void swapextra (lua_State *L) {
63 566 : if (L->status == LUA_YIELD) {
64 0 : CallInfo *ci = L->ci; /* get function that yielded */
65 0 : StkId temp = ci->func; /* exchange its 'func' and 'extra' values */
66 0 : ci->func = restorestack(L, ci->extra);
67 0 : ci->extra = savestack(L, temp);
68 : }
69 566 : }
70 :
71 :
72 : /*
73 : ** This function can be called asynchronously (e.g. during a signal).
74 : ** Fields 'oldpc', 'basehookcount', and 'hookcount' (set by
75 : ** 'resethookcount') are for debug only, and it is no problem if they
76 : ** get arbitrary values (causes at most one wrong hook call). 'hookmask'
77 : ** is an atomic value. We assume that pointers are atomic too (e.g., gcc
78 : ** ensures that for all platforms where it runs). Moreover, 'hook' is
79 : ** always checked before being called (see 'luaD_hook').
80 : */
81 2 : LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
82 2 : if (func == NULL || mask == 0) { /* turn off hooks? */
83 1 : mask = 0;
84 1 : func = NULL;
85 : }
86 2 : if (isLua(L->ci))
87 0 : L->oldpc = L->ci->u.l.savedpc;
88 2 : L->hook = func;
89 2 : L->basehookcount = count;
90 2 : resethookcount(L);
91 2 : L->hookmask = cast_byte(mask);
92 2 : }
93 :
94 :
95 3 : LUA_API lua_Hook lua_gethook (lua_State *L) {
96 3 : return L->hook;
97 : }
98 :
99 :
100 3 : LUA_API int lua_gethookmask (lua_State *L) {
101 3 : return L->hookmask;
102 : }
103 :
104 :
105 3 : LUA_API int lua_gethookcount (lua_State *L) {
106 3 : return L->basehookcount;
107 : }
108 :
109 :
110 297 : LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
111 : int status;
112 : CallInfo *ci;
113 297 : if (level < 0) return 0; /* invalid (negative) level */
114 : lua_lock(L);
115 586 : for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)
116 289 : level--;
117 297 : if (level == 0 && ci != &L->base_ci) { /* level found? */
118 280 : status = 1;
119 280 : ar->i_ci = ci;
120 : }
121 17 : else status = 0; /* no such level */
122 : lua_unlock(L);
123 297 : return status;
124 : }
125 :
126 :
127 86 : static const char *upvalname (Proto *p, int uv) {
128 86 : TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);
129 86 : if (s == NULL) return "?";
130 86 : else return getstr(s);
131 : }
132 :
133 :
134 0 : static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
135 0 : int nparams = clLvalue(ci->func)->p->numparams;
136 0 : int nvararg = cast_int(ci->u.l.base - ci->func) - nparams;
137 0 : if (n <= -nvararg)
138 0 : return NULL; /* no such vararg */
139 : else {
140 0 : *pos = ci->func + nparams - n;
141 0 : return "(*vararg)"; /* generic name for any vararg */
142 : }
143 : }
144 :
145 :
146 3 : static const char *findlocal (lua_State *L, CallInfo *ci, int n,
147 : StkId *pos) {
148 3 : const char *name = NULL;
149 : StkId base;
150 3 : if (isLua(ci)) {
151 0 : if (n < 0) /* access to vararg values? */
152 0 : return findvararg(ci, n, pos);
153 : else {
154 0 : base = ci->u.l.base;
155 0 : name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
156 : }
157 : }
158 : else
159 3 : base = ci->func + 1;
160 3 : if (name == NULL) { /* no 'standard' name? */
161 3 : StkId limit = (ci == L->ci) ? L->top : ci->next->func;
162 3 : if (limit - base >= n && n > 0) /* is 'n' inside 'ci' stack? */
163 2 : name = "(*temporary)"; /* generic name for any valid slot */
164 : else
165 1 : return NULL; /* no name */
166 : }
167 2 : *pos = base + (n - 1);
168 2 : return name;
169 : }
170 :
171 :
172 2 : LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
173 : const char *name;
174 : lua_lock(L);
175 2 : swapextra(L);
176 2 : if (ar == NULL) { /* information about non-active function? */
177 1 : if (!isLfunction(L->top - 1)) /* not a Lua function? */
178 0 : name = NULL;
179 : else /* consider live variables at function start (parameters) */
180 1 : name = luaF_getlocalname(clLvalue(L->top - 1)->p, n, 0);
181 : }
182 : else { /* active function; get information through 'ar' */
183 1 : StkId pos = NULL; /* to avoid warnings */
184 1 : name = findlocal(L, ar->i_ci, n, &pos);
185 1 : if (name) {
186 1 : setobj2s(L, L->top, pos);
187 1 : api_incr_top(L);
188 : }
189 : }
190 2 : swapextra(L);
191 : lua_unlock(L);
192 2 : return name;
193 : }
194 :
195 :
196 2 : LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
197 2 : StkId pos = NULL; /* to avoid warnings */
198 : const char *name;
199 : lua_lock(L);
200 2 : swapextra(L);
201 2 : name = findlocal(L, ar->i_ci, n, &pos);
202 2 : if (name) {
203 1 : setobjs2s(L, pos, L->top - 1);
204 1 : L->top--; /* pop value */
205 : }
206 2 : swapextra(L);
207 : lua_unlock(L);
208 2 : return name;
209 : }
210 :
211 :
212 192 : static void funcinfo (lua_Debug *ar, Closure *cl) {
213 192 : if (noLuaClosure(cl)) {
214 58 : ar->source = "=[C]";
215 58 : ar->linedefined = -1;
216 58 : ar->lastlinedefined = -1;
217 58 : ar->what = "C";
218 : }
219 : else {
220 134 : Proto *p = cl->l.p;
221 134 : ar->source = p->source ? getstr(p->source) : "=?";
222 134 : ar->linedefined = p->linedefined;
223 134 : ar->lastlinedefined = p->lastlinedefined;
224 134 : ar->what = (ar->linedefined == 0) ? "main" : "Lua";
225 : }
226 192 : luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
227 192 : }
228 :
229 :
230 1 : static void collectvalidlines (lua_State *L, Closure *f) {
231 1 : if (noLuaClosure(f)) {
232 0 : setnilvalue(L->top);
233 0 : api_incr_top(L);
234 : }
235 : else {
236 : int i;
237 : TValue v;
238 1 : int *lineinfo = f->l.p->lineinfo;
239 1 : Table *t = luaH_new(L); /* new table to store active lines */
240 1 : sethvalue(L, L->top, t); /* push it on stack */
241 1 : api_incr_top(L);
242 1 : setbvalue(&v, 1); /* boolean 'true' to be the value of all indices */
243 26 : for (i = 0; i < f->l.p->sizelineinfo; i++) /* for all lines with code */
244 25 : luaH_setint(L, t, lineinfo[i], &v); /* table[line] = true */
245 : }
246 1 : }
247 :
248 :
249 86 : static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
250 86 : if (ci == NULL) /* no 'ci'? */
251 1 : return NULL; /* no info */
252 85 : else if (ci->callstatus & CIST_FIN) { /* is this a finalizer? */
253 0 : *name = "__gc";
254 0 : return "metamethod"; /* report it as such */
255 : }
256 : /* calling function is a known Lua function? */
257 85 : else if (!(ci->callstatus & CIST_TAIL) && isLua(ci->previous))
258 73 : return funcnamefromcode(L, ci->previous, name);
259 12 : else return NULL; /* no way to find a name */
260 : }
261 :
262 :
263 279 : static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
264 : Closure *f, CallInfo *ci) {
265 279 : int status = 1;
266 784 : for (; *what; what++) {
267 505 : switch (*what) {
268 192 : case 'S': {
269 192 : funcinfo(ar, f);
270 192 : break;
271 : }
272 192 : case 'l': {
273 192 : ar->currentline = (ci && isLua(ci)) ? currentline(ci) : -1;
274 192 : break;
275 : }
276 2 : case 'u': {
277 2 : ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
278 2 : if (noLuaClosure(f)) {
279 0 : ar->isvararg = 1;
280 0 : ar->nparams = 0;
281 : }
282 : else {
283 2 : ar->isvararg = f->l.p->is_vararg;
284 2 : ar->nparams = f->l.p->numparams;
285 : }
286 2 : break;
287 : }
288 15 : case 't': {
289 15 : ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;
290 15 : break;
291 : }
292 86 : case 'n': {
293 86 : ar->namewhat = getfuncname(L, ci, &ar->name);
294 86 : if (ar->namewhat == NULL) {
295 13 : ar->namewhat = ""; /* not found */
296 13 : ar->name = NULL;
297 : }
298 86 : break;
299 : }
300 17 : case 'L':
301 : case 'f': /* handled by lua_getinfo */
302 17 : break;
303 1 : default: status = 0; /* invalid option */
304 : }
305 : }
306 279 : return status;
307 : }
308 :
309 :
310 279 : LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
311 : int status;
312 : Closure *cl;
313 : CallInfo *ci;
314 : StkId func;
315 : lua_lock(L);
316 279 : swapextra(L);
317 279 : if (*what == '>') {
318 3 : ci = NULL;
319 3 : func = L->top - 1;
320 : api_check(L, ttisfunction(func), "function expected");
321 3 : what++; /* skip the '>' */
322 3 : L->top--; /* pop function */
323 : }
324 : else {
325 276 : ci = ar->i_ci;
326 276 : func = ci->func;
327 : lua_assert(ttisfunction(ci->func));
328 : }
329 279 : cl = ttisclosure(func) ? clvalue(func) : NULL;
330 279 : status = auxgetinfo(L, what, ar, cl, ci);
331 279 : if (strchr(what, 'f')) {
332 16 : setobjs2s(L, L->top, func);
333 16 : api_incr_top(L);
334 : }
335 279 : swapextra(L); /* correct before option 'L', which can raise a mem. error */
336 279 : if (strchr(what, 'L'))
337 1 : collectvalidlines(L, cl);
338 : lua_unlock(L);
339 279 : return status;
340 : }
341 :
342 :
343 : /*
344 : ** {======================================================
345 : ** Symbolic Execution
346 : ** =======================================================
347 : */
348 :
349 : static const char *getobjname (Proto *p, int lastpc, int reg,
350 : const char **name);
351 :
352 :
353 : /*
354 : ** find a "name" for the RK value 'c'
355 : */
356 73 : static void kname (Proto *p, int pc, int c, const char **name) {
357 73 : if (ISK(c)) { /* is 'c' a constant? */
358 73 : TValue *kvalue = &p->k[INDEXK(c)];
359 73 : if (ttisstring(kvalue)) { /* literal constant? */
360 73 : *name = svalue(kvalue); /* it is its own name */
361 73 : return;
362 : }
363 : /* else no reasonable name found */
364 : }
365 : else { /* 'c' is a register */
366 0 : const char *what = getobjname(p, pc, c, name); /* search for 'c' */
367 0 : if (what && *what == 'c') { /* found a constant name? */
368 0 : return; /* 'name' already filled */
369 : }
370 : /* else no reasonable name found */
371 : }
372 0 : *name = "?"; /* no reasonable name found */
373 : }
374 :
375 :
376 545 : static int filterpc (int pc, int jmptarget) {
377 545 : if (pc < jmptarget) /* is code conditional (inside a jump)? */
378 172 : return -1; /* cannot know who sets that register */
379 373 : else return pc; /* current position sets that register */
380 : }
381 :
382 :
383 : /*
384 : ** try to find last instruction before 'lastpc' that modified register 'reg'
385 : */
386 172 : static int findsetreg (Proto *p, int lastpc, int reg) {
387 : int pc;
388 172 : int setreg = -1; /* keep last instruction that changed 'reg' */
389 172 : int jmptarget = 0; /* any code before this address is conditional */
390 1589 : for (pc = 0; pc < lastpc; pc++) {
391 1417 : Instruction i = p->code[pc];
392 1417 : OpCode op = GET_OPCODE(i);
393 1417 : int a = GETARG_A(i);
394 1417 : switch (op) {
395 17 : case OP_LOADNIL: {
396 17 : int b = GETARG_B(i);
397 17 : if (a <= reg && reg <= a + b) /* set registers from 'a' to 'a+b' */
398 5 : setreg = filterpc(pc, jmptarget);
399 17 : break;
400 : }
401 0 : case OP_TFORCALL: {
402 0 : if (reg >= a + 2) /* affect all regs above its base */
403 0 : setreg = filterpc(pc, jmptarget);
404 0 : break;
405 : }
406 248 : case OP_CALL:
407 : case OP_TAILCALL: {
408 248 : if (reg >= a) /* affect all registers above base */
409 247 : setreg = filterpc(pc, jmptarget);
410 248 : break;
411 : }
412 47 : case OP_JMP: {
413 47 : int b = GETARG_sBx(i);
414 47 : int dest = pc + 1 + b;
415 : /* jump is forward and do not skip 'lastpc'? */
416 47 : if (pc < dest && dest <= lastpc) {
417 47 : if (dest > jmptarget)
418 35 : jmptarget = dest; /* update 'jmptarget' */
419 : }
420 47 : break;
421 : }
422 1105 : default:
423 1105 : if (testAMode(op) && reg == a) /* any instruction that set A */
424 293 : setreg = filterpc(pc, jmptarget);
425 1105 : break;
426 : }
427 : }
428 172 : return setreg;
429 : }
430 :
431 :
432 182 : static const char *getobjname (Proto *p, int lastpc, int reg,
433 : const char **name) {
434 : int pc;
435 182 : *name = luaF_getlocalname(p, reg + 1, lastpc);
436 182 : if (*name) /* is a local? */
437 10 : return "local";
438 : /* else try symbolic execution */
439 172 : pc = findsetreg(p, lastpc, reg);
440 172 : if (pc != -1) { /* could find instruction? */
441 172 : Instruction i = p->code[pc];
442 172 : OpCode op = GET_OPCODE(i);
443 172 : switch (op) {
444 0 : case OP_MOVE: {
445 0 : int b = GETARG_B(i); /* move from 'b' to 'a' */
446 0 : if (b < GETARG_A(i))
447 0 : return getobjname(p, pc, b, name); /* get name for 'b' */
448 0 : break;
449 : }
450 71 : case OP_GETTABUP:
451 : case OP_GETTABLE: {
452 71 : int k = GETARG_C(i); /* key index */
453 71 : int t = GETARG_B(i); /* table index */
454 71 : const char *vn = (op == OP_GETTABLE) /* name of indexed variable */
455 54 : ? luaF_getlocalname(p, t + 1, pc)
456 71 : : upvalname(p, t);
457 71 : kname(p, pc, k, name);
458 71 : return (vn && strcmp(vn, LUA_ENV) == 0) ? "global" : "field";
459 : }
460 65 : case OP_GETUPVAL: {
461 65 : *name = upvalname(p, GETARG_B(i));
462 65 : return "upvalue";
463 : }
464 3 : case OP_LOADK:
465 : case OP_LOADKX: {
466 6 : int b = (op == OP_LOADK) ? GETARG_Bx(i)
467 3 : : GETARG_Ax(p->code[pc + 1]);
468 3 : if (ttisstring(&p->k[b])) {
469 2 : *name = svalue(&p->k[b]);
470 2 : return "constant";
471 : }
472 1 : break;
473 : }
474 2 : case OP_SELF: {
475 2 : int k = GETARG_C(i); /* key index */
476 2 : kname(p, pc, k, name);
477 2 : return "method";
478 : }
479 31 : default: break; /* go through to return NULL */
480 : }
481 : }
482 32 : return NULL; /* could not find reasonable name */
483 : }
484 :
485 :
486 : /*
487 : ** Try to find a name for a function based on the code that called it.
488 : ** (Only works when function was called by a Lua function.)
489 : ** Returns what the name is (e.g., "for iterator", "method",
490 : ** "metamethod") and sets '*name' to point to the name.
491 : */
492 73 : static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
493 : const char **name) {
494 73 : TMS tm = (TMS)0; /* (initial value avoids warnings) */
495 73 : Proto *p = ci_func(ci)->p; /* calling function */
496 73 : int pc = currentpc(ci); /* calling instruction index */
497 73 : Instruction i = p->code[pc]; /* calling instruction */
498 73 : if (ci->callstatus & CIST_HOOKED) { /* was it called inside a hook? */
499 0 : *name = "?";
500 0 : return "hook";
501 : }
502 73 : switch (GET_OPCODE(i)) {
503 73 : case OP_CALL:
504 : case OP_TAILCALL:
505 73 : return getobjname(p, pc, GETARG_A(i), name); /* get function name */
506 0 : case OP_TFORCALL: { /* for iterator */
507 0 : *name = "for iterator";
508 0 : return "for iterator";
509 : }
510 : /* other instructions can do calls through metamethods */
511 0 : case OP_SELF: case OP_GETTABUP: case OP_GETTABLE:
512 0 : tm = TM_INDEX;
513 0 : break;
514 0 : case OP_SETTABUP: case OP_SETTABLE:
515 0 : tm = TM_NEWINDEX;
516 0 : break;
517 0 : case OP_ADD: case OP_SUB: case OP_MUL: case OP_MOD:
518 : case OP_POW: case OP_DIV: case OP_IDIV: case OP_BAND:
519 : case OP_BOR: case OP_BXOR: case OP_SHL: case OP_SHR: {
520 0 : int offset = cast_int(GET_OPCODE(i)) - cast_int(OP_ADD); /* ORDER OP */
521 0 : tm = cast(TMS, offset + cast_int(TM_ADD)); /* ORDER TM */
522 0 : break;
523 : }
524 0 : case OP_UNM: tm = TM_UNM; break;
525 0 : case OP_BNOT: tm = TM_BNOT; break;
526 0 : case OP_LEN: tm = TM_LEN; break;
527 0 : case OP_CONCAT: tm = TM_CONCAT; break;
528 0 : case OP_EQ: tm = TM_EQ; break;
529 0 : case OP_LT: tm = TM_LT; break;
530 0 : case OP_LE: tm = TM_LE; break;
531 0 : default:
532 0 : return NULL; /* cannot find a reasonable name */
533 : }
534 0 : *name = getstr(G(L)->tmname[tm]);
535 0 : return "metamethod";
536 : }
537 :
538 : /* }====================================================== */
539 :
540 :
541 :
542 : /*
543 : ** The subtraction of two potentially unrelated pointers is
544 : ** not ISO C, but it should not crash a program; the subsequent
545 : ** checks are ISO C and ensure a correct result.
546 : */
547 189 : static int isinstack (CallInfo *ci, const TValue *o) {
548 189 : ptrdiff_t i = o - ci->u.l.base;
549 189 : return (0 <= i && i < (ci->top - ci->u.l.base) && ci->u.l.base + i == o);
550 : }
551 :
552 :
553 : /*
554 : ** Checks whether value 'o' came from an upvalue. (That can only happen
555 : ** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on
556 : ** upvalues.)
557 : */
558 193 : static const char *getupvalname (CallInfo *ci, const TValue *o,
559 : const char **name) {
560 193 : LClosure *c = ci_func(ci);
561 : int i;
562 278 : for (i = 0; i < c->nupvalues; i++) {
563 89 : if (c->upvals[i]->v == o) {
564 4 : *name = upvalname(c->p, i);
565 4 : return "upvalue";
566 : }
567 : }
568 189 : return NULL;
569 : }
570 :
571 :
572 195 : static const char *varinfo (lua_State *L, const TValue *o) {
573 195 : const char *name = NULL; /* to avoid warnings */
574 195 : CallInfo *ci = L->ci;
575 195 : const char *kind = NULL;
576 195 : if (isLua(ci)) {
577 193 : kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */
578 193 : if (!kind && isinstack(ci, o)) /* no? try a register */
579 109 : kind = getobjname(ci_func(ci)->p, currentpc(ci),
580 109 : cast_int(o - ci->u.l.base), &name);
581 : }
582 195 : return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
583 : }
584 :
585 :
586 184 : l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
587 184 : const char *t = luaT_objtypename(L, o);
588 184 : luaG_runerror(L, "attempt to %s a %s value%s", op, t, varinfo(L, o));
589 : }
590 :
591 :
592 9 : l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {
593 9 : if (ttisstring(p1) || cvt2str(p1)) p1 = p2;
594 9 : luaG_typeerror(L, p1, "concatenate");
595 : }
596 :
597 :
598 152 : l_noret luaG_opinterror (lua_State *L, const TValue *p1,
599 : const TValue *p2, const char *msg) {
600 : lua_Number temp;
601 152 : if (!tonumber(p1, &temp)) /* first operand is wrong? */
602 101 : p2 = p1; /* now second is wrong */
603 152 : luaG_typeerror(L, p2, msg);
604 : }
605 :
606 :
607 : /*
608 : ** Error when both values are convertible to numbers, but not to integers
609 : */
610 11 : l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {
611 : lua_Integer temp;
612 11 : if (!tointeger(p1, &temp))
613 6 : p2 = p1;
614 11 : luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));
615 : }
616 :
617 :
618 74 : l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
619 74 : const char *t1 = luaT_objtypename(L, p1);
620 74 : const char *t2 = luaT_objtypename(L, p2);
621 74 : if (strcmp(t1, t2) == 0)
622 28 : luaG_runerror(L, "attempt to compare two %s values", t1);
623 : else
624 46 : luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
625 : }
626 :
627 :
628 : /* add src:line information to 'msg' */
629 315 : const char *luaG_addinfo (lua_State *L, const char *msg, TString *src,
630 : int line) {
631 : char buff[LUA_IDSIZE];
632 315 : if (src)
633 315 : luaO_chunkid(buff, getstr(src), LUA_IDSIZE);
634 : else { /* no source available; use "?" instead */
635 0 : buff[0] = '?'; buff[1] = '\0';
636 : }
637 315 : return luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
638 : }
639 :
640 :
641 466 : l_noret luaG_errormsg (lua_State *L) {
642 466 : if (L->errfunc != 0) { /* is there an error handling function? */
643 8 : StkId errfunc = restorestack(L, L->errfunc);
644 8 : setobjs2s(L, L->top, L->top - 1); /* move argument */
645 8 : setobjs2s(L, L->top - 1, errfunc); /* push function */
646 8 : L->top++; /* assume EXTRA_STACK */
647 8 : luaD_callnoyield(L, L->top - 2, 1); /* call it */
648 : }
649 466 : luaD_throw(L, LUA_ERRRUN);
650 : }
651 :
652 :
653 279 : l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
654 279 : CallInfo *ci = L->ci;
655 : const char *msg;
656 : va_list argp;
657 279 : luaC_checkGC(L); /* error message uses memory */
658 279 : va_start(argp, fmt);
659 279 : msg = luaO_pushvfstring(L, fmt, argp); /* format message */
660 279 : va_end(argp);
661 279 : if (isLua(ci)) /* if Lua function, add source:line information */
662 274 : luaG_addinfo(L, msg, ci_func(ci)->p->source, currentline(ci));
663 279 : luaG_errormsg(L);
664 : }
665 :
666 :
667 1345 : void luaG_traceexec (lua_State *L) {
668 1345 : CallInfo *ci = L->ci;
669 1345 : lu_byte mask = L->hookmask;
670 1345 : int counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
671 1345 : if (counthook)
672 32 : resethookcount(L); /* reset count */
673 1313 : else if (!(mask & LUA_MASKLINE))
674 1313 : return; /* no line hook and count != 0; nothing to be done */
675 32 : if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
676 0 : ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
677 0 : return; /* do not call hook again (VM yielded, so it did not move) */
678 : }
679 32 : if (counthook)
680 32 : luaD_hook(L, LUA_HOOKCOUNT, -1); /* call count hook */
681 32 : if (mask & LUA_MASKLINE) {
682 0 : Proto *p = ci_func(ci)->p;
683 0 : int npc = pcRel(ci->u.l.savedpc, p);
684 0 : int newline = getfuncline(p, npc);
685 0 : if (npc == 0 || /* call linehook when enter a new function, */
686 0 : ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */
687 0 : newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */
688 0 : luaD_hook(L, LUA_HOOKLINE, newline); /* call line hook */
689 : }
690 32 : L->oldpc = ci->u.l.savedpc;
691 32 : if (L->status == LUA_YIELD) { /* did hook yield? */
692 0 : if (counthook)
693 0 : L->hookcount = 1; /* undo decrement to zero */
694 0 : ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
695 0 : ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
696 0 : ci->func = L->top - 1; /* protect stack below results */
697 0 : luaD_throw(L, LUA_YIELD);
698 : }
699 : }
700 :
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