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comparison src/lua/ldebug.c @ 11:27763b933818

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raise lua sources up one level
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 11:07:39 -0600
parents src/lua/src/ldebug.c@f9f4f1b99eed
children
comparison
equal deleted inserted replaced
10:48b74a4e4692 11:27763b933818
1 /*
2 ** $Id: ldebug.c,v 2.29.1.6 2008/05/08 16:56:26 roberto Exp $
3 ** Debug Interface
4 ** See Copyright Notice in lua.h
5 */
6
7
8 #include <stdarg.h>
9 #include <stddef.h>
10 #include <string.h>
11
12
13 #define ldebug_c
14 #define LUA_CORE
15
16 #include "lua.h"
17
18 #include "lapi.h"
19 #include "lcode.h"
20 #include "ldebug.h"
21 #include "ldo.h"
22 #include "lfunc.h"
23 #include "lobject.h"
24 #include "lopcodes.h"
25 #include "lstate.h"
26 #include "lstring.h"
27 #include "ltable.h"
28 #include "ltm.h"
29 #include "lvm.h"
30
31
32
33 static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
34
35
36 static int currentpc (lua_State *L, CallInfo *ci) {
37 if (!isLua(ci)) return -1; /* function is not a Lua function? */
38 if (ci == L->ci)
39 ci->savedpc = L->savedpc;
40 return pcRel(ci->savedpc, ci_func(ci)->l.p);
41 }
42
43
44 static int currentline (lua_State *L, CallInfo *ci) {
45 int pc = currentpc(L, ci);
46 if (pc < 0)
47 return -1; /* only active lua functions have current-line information */
48 else
49 return getline(ci_func(ci)->l.p, pc);
50 }
51
52
53 /*
54 ** this function can be called asynchronous (e.g. during a signal)
55 */
56 LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
57 if (func == NULL || mask == 0) { /* turn off hooks? */
58 mask = 0;
59 func = NULL;
60 }
61 L->hook = func;
62 L->basehookcount = count;
63 resethookcount(L);
64 L->hookmask = cast_byte(mask);
65 return 1;
66 }
67
68
69 LUA_API lua_Hook lua_gethook (lua_State *L) {
70 return L->hook;
71 }
72
73
74 LUA_API int lua_gethookmask (lua_State *L) {
75 return L->hookmask;
76 }
77
78
79 LUA_API int lua_gethookcount (lua_State *L) {
80 return L->basehookcount;
81 }
82
83
84 LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
85 int status;
86 CallInfo *ci;
87 lua_lock(L);
88 for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
89 level--;
90 if (f_isLua(ci)) /* Lua function? */
91 level -= ci->tailcalls; /* skip lost tail calls */
92 }
93 if (level == 0 && ci > L->base_ci) { /* level found? */
94 status = 1;
95 ar->i_ci = cast_int(ci - L->base_ci);
96 }
97 else if (level < 0) { /* level is of a lost tail call? */
98 status = 1;
99 ar->i_ci = 0;
100 }
101 else status = 0; /* no such level */
102 lua_unlock(L);
103 return status;
104 }
105
106
107 static Proto *getluaproto (CallInfo *ci) {
108 return (isLua(ci) ? ci_func(ci)->l.p : NULL);
109 }
110
111
112 static const char *findlocal (lua_State *L, CallInfo *ci, int n) {
113 const char *name;
114 Proto *fp = getluaproto(ci);
115 if (fp && (name = luaF_getlocalname(fp, n, currentpc(L, ci))) != NULL)
116 return name; /* is a local variable in a Lua function */
117 else {
118 StkId limit = (ci == L->ci) ? L->top : (ci+1)->func;
119 if (limit - ci->base >= n && n > 0) /* is 'n' inside 'ci' stack? */
120 return "(*temporary)";
121 else
122 return NULL;
123 }
124 }
125
126
127 LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
128 CallInfo *ci = L->base_ci + ar->i_ci;
129 const char *name = findlocal(L, ci, n);
130 lua_lock(L);
131 if (name)
132 luaA_pushobject(L, ci->base + (n - 1));
133 lua_unlock(L);
134 return name;
135 }
136
137
138 LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
139 CallInfo *ci = L->base_ci + ar->i_ci;
140 const char *name = findlocal(L, ci, n);
141 lua_lock(L);
142 if (name)
143 setobjs2s(L, ci->base + (n - 1), L->top - 1);
144 L->top--; /* pop value */
145 lua_unlock(L);
146 return name;
147 }
148
149
150 static void funcinfo (lua_Debug *ar, Closure *cl) {
151 if (cl->c.isC) {
152 ar->source = "=[C]";
153 ar->linedefined = -1;
154 ar->lastlinedefined = -1;
155 ar->what = "C";
156 }
157 else {
158 ar->source = getstr(cl->l.p->source);
159 ar->linedefined = cl->l.p->linedefined;
160 ar->lastlinedefined = cl->l.p->lastlinedefined;
161 ar->what = (ar->linedefined == 0) ? "main" : "Lua";
162 }
163 luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
164 }
165
166
167 static void info_tailcall (lua_Debug *ar) {
168 ar->name = ar->namewhat = "";
169 ar->what = "tail";
170 ar->lastlinedefined = ar->linedefined = ar->currentline = -1;
171 ar->source = "=(tail call)";
172 luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
173 ar->nups = 0;
174 }
175
176
177 static void collectvalidlines (lua_State *L, Closure *f) {
178 if (f == NULL || f->c.isC) {
179 setnilvalue(L->top);
180 }
181 else {
182 Table *t = luaH_new(L, 0, 0);
183 int *lineinfo = f->l.p->lineinfo;
184 int i;
185 for (i=0; i<f->l.p->sizelineinfo; i++)
186 setbvalue(luaH_setnum(L, t, lineinfo[i]), 1);
187 sethvalue(L, L->top, t);
188 }
189 incr_top(L);
190 }
191
192
193 static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
194 Closure *f, CallInfo *ci) {
195 int status = 1;
196 if (f == NULL) {
197 info_tailcall(ar);
198 return status;
199 }
200 for (; *what; what++) {
201 switch (*what) {
202 case 'S': {
203 funcinfo(ar, f);
204 break;
205 }
206 case 'l': {
207 ar->currentline = (ci) ? currentline(L, ci) : -1;
208 break;
209 }
210 case 'u': {
211 ar->nups = f->c.nupvalues;
212 break;
213 }
214 case 'n': {
215 ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL;
216 if (ar->namewhat == NULL) {
217 ar->namewhat = ""; /* not found */
218 ar->name = NULL;
219 }
220 break;
221 }
222 case 'L':
223 case 'f': /* handled by lua_getinfo */
224 break;
225 default: status = 0; /* invalid option */
226 }
227 }
228 return status;
229 }
230
231
232 LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
233 int status;
234 Closure *f = NULL;
235 CallInfo *ci = NULL;
236 lua_lock(L);
237 if (*what == '>') {
238 StkId func = L->top - 1;
239 luai_apicheck(L, ttisfunction(func));
240 what++; /* skip the '>' */
241 f = clvalue(func);
242 L->top--; /* pop function */
243 }
244 else if (ar->i_ci != 0) { /* no tail call? */
245 ci = L->base_ci + ar->i_ci;
246 lua_assert(ttisfunction(ci->func));
247 f = clvalue(ci->func);
248 }
249 status = auxgetinfo(L, what, ar, f, ci);
250 if (strchr(what, 'f')) {
251 if (f == NULL) setnilvalue(L->top);
252 else setclvalue(L, L->top, f);
253 incr_top(L);
254 }
255 if (strchr(what, 'L'))
256 collectvalidlines(L, f);
257 lua_unlock(L);
258 return status;
259 }
260
261
262 /*
263 ** {======================================================
264 ** Symbolic Execution and code checker
265 ** =======================================================
266 */
267
268 #define check(x) if (!(x)) return 0;
269
270 #define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
271
272 #define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
273
274
275
276 static int precheck (const Proto *pt) {
277 check(pt->maxstacksize <= MAXSTACK);
278 check(pt->numparams+(pt->is_vararg & VARARG_HASARG) <= pt->maxstacksize);
279 check(!(pt->is_vararg & VARARG_NEEDSARG) ||
280 (pt->is_vararg & VARARG_HASARG));
281 check(pt->sizeupvalues <= pt->nups);
282 check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
283 check(pt->sizecode > 0 && GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
284 return 1;
285 }
286
287
288 #define checkopenop(pt,pc) luaG_checkopenop((pt)->code[(pc)+1])
289
290 int luaG_checkopenop (Instruction i) {
291 switch (GET_OPCODE(i)) {
292 case OP_CALL:
293 case OP_TAILCALL:
294 case OP_RETURN:
295 case OP_SETLIST: {
296 check(GETARG_B(i) == 0);
297 return 1;
298 }
299 default: return 0; /* invalid instruction after an open call */
300 }
301 }
302
303
304 static int checkArgMode (const Proto *pt, int r, enum OpArgMask mode) {
305 switch (mode) {
306 case OpArgN: check(r == 0); break;
307 case OpArgU: break;
308 case OpArgR: checkreg(pt, r); break;
309 case OpArgK:
310 check(ISK(r) ? INDEXK(r) < pt->sizek : r < pt->maxstacksize);
311 break;
312 }
313 return 1;
314 }
315
316
317 static Instruction symbexec (const Proto *pt, int lastpc, int reg) {
318 int pc;
319 int last; /* stores position of last instruction that changed `reg' */
320 last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
321 check(precheck(pt));
322 for (pc = 0; pc < lastpc; pc++) {
323 Instruction i = pt->code[pc];
324 OpCode op = GET_OPCODE(i);
325 int a = GETARG_A(i);
326 int b = 0;
327 int c = 0;
328 check(op < NUM_OPCODES);
329 checkreg(pt, a);
330 switch (getOpMode(op)) {
331 case iABC: {
332 b = GETARG_B(i);
333 c = GETARG_C(i);
334 check(checkArgMode(pt, b, getBMode(op)));
335 check(checkArgMode(pt, c, getCMode(op)));
336 break;
337 }
338 case iABx: {
339 b = GETARG_Bx(i);
340 if (getBMode(op) == OpArgK) check(b < pt->sizek);
341 break;
342 }
343 case iAsBx: {
344 b = GETARG_sBx(i);
345 if (getBMode(op) == OpArgR) {
346 int dest = pc+1+b;
347 check(0 <= dest && dest < pt->sizecode);
348 if (dest > 0) {
349 int j;
350 /* check that it does not jump to a setlist count; this
351 is tricky, because the count from a previous setlist may
352 have the same value of an invalid setlist; so, we must
353 go all the way back to the first of them (if any) */
354 for (j = 0; j < dest; j++) {
355 Instruction d = pt->code[dest-1-j];
356 if (!(GET_OPCODE(d) == OP_SETLIST && GETARG_C(d) == 0)) break;
357 }
358 /* if 'j' is even, previous value is not a setlist (even if
359 it looks like one) */
360 check((j&1) == 0);
361 }
362 }
363 break;
364 }
365 }
366 if (testAMode(op)) {
367 if (a == reg) last = pc; /* change register `a' */
368 }
369 if (testTMode(op)) {
370 check(pc+2 < pt->sizecode); /* check skip */
371 check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
372 }
373 switch (op) {
374 case OP_LOADBOOL: {
375 if (c == 1) { /* does it jump? */
376 check(pc+2 < pt->sizecode); /* check its jump */
377 check(GET_OPCODE(pt->code[pc+1]) != OP_SETLIST ||
378 GETARG_C(pt->code[pc+1]) != 0);
379 }
380 break;
381 }
382 case OP_LOADNIL: {
383 if (a <= reg && reg <= b)
384 last = pc; /* set registers from `a' to `b' */
385 break;
386 }
387 case OP_GETUPVAL:
388 case OP_SETUPVAL: {
389 check(b < pt->nups);
390 break;
391 }
392 case OP_GETGLOBAL:
393 case OP_SETGLOBAL: {
394 check(ttisstring(&pt->k[b]));
395 break;
396 }
397 case OP_SELF: {
398 checkreg(pt, a+1);
399 if (reg == a+1) last = pc;
400 break;
401 }
402 case OP_CONCAT: {
403 check(b < c); /* at least two operands */
404 break;
405 }
406 case OP_TFORLOOP: {
407 check(c >= 1); /* at least one result (control variable) */
408 checkreg(pt, a+2+c); /* space for results */
409 if (reg >= a+2) last = pc; /* affect all regs above its base */
410 break;
411 }
412 case OP_FORLOOP:
413 case OP_FORPREP:
414 checkreg(pt, a+3);
415 /* go through */
416 case OP_JMP: {
417 int dest = pc+1+b;
418 /* not full check and jump is forward and do not skip `lastpc'? */
419 if (reg != NO_REG && pc < dest && dest <= lastpc)
420 pc += b; /* do the jump */
421 break;
422 }
423 case OP_CALL:
424 case OP_TAILCALL: {
425 if (b != 0) {
426 checkreg(pt, a+b-1);
427 }
428 c--; /* c = num. returns */
429 if (c == LUA_MULTRET) {
430 check(checkopenop(pt, pc));
431 }
432 else if (c != 0)
433 checkreg(pt, a+c-1);
434 if (reg >= a) last = pc; /* affect all registers above base */
435 break;
436 }
437 case OP_RETURN: {
438 b--; /* b = num. returns */
439 if (b > 0) checkreg(pt, a+b-1);
440 break;
441 }
442 case OP_SETLIST: {
443 if (b > 0) checkreg(pt, a + b);
444 if (c == 0) {
445 pc++;
446 check(pc < pt->sizecode - 1);
447 }
448 break;
449 }
450 case OP_CLOSURE: {
451 int nup, j;
452 check(b < pt->sizep);
453 nup = pt->p[b]->nups;
454 check(pc + nup < pt->sizecode);
455 for (j = 1; j <= nup; j++) {
456 OpCode op1 = GET_OPCODE(pt->code[pc + j]);
457 check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
458 }
459 if (reg != NO_REG) /* tracing? */
460 pc += nup; /* do not 'execute' these pseudo-instructions */
461 break;
462 }
463 case OP_VARARG: {
464 check((pt->is_vararg & VARARG_ISVARARG) &&
465 !(pt->is_vararg & VARARG_NEEDSARG));
466 b--;
467 if (b == LUA_MULTRET) check(checkopenop(pt, pc));
468 checkreg(pt, a+b-1);
469 break;
470 }
471 default: break;
472 }
473 }
474 return pt->code[last];
475 }
476
477 #undef check
478 #undef checkjump
479 #undef checkreg
480
481 /* }====================================================== */
482
483
484 int luaG_checkcode (const Proto *pt) {
485 return (symbexec(pt, pt->sizecode, NO_REG) != 0);
486 }
487
488
489 static const char *kname (Proto *p, int c) {
490 if (ISK(c) && ttisstring(&p->k[INDEXK(c)]))
491 return svalue(&p->k[INDEXK(c)]);
492 else
493 return "?";
494 }
495
496
497 static const char *getobjname (lua_State *L, CallInfo *ci, int stackpos,
498 const char **name) {
499 if (isLua(ci)) { /* a Lua function? */
500 Proto *p = ci_func(ci)->l.p;
501 int pc = currentpc(L, ci);
502 Instruction i;
503 *name = luaF_getlocalname(p, stackpos+1, pc);
504 if (*name) /* is a local? */
505 return "local";
506 i = symbexec(p, pc, stackpos); /* try symbolic execution */
507 lua_assert(pc != -1);
508 switch (GET_OPCODE(i)) {
509 case OP_GETGLOBAL: {
510 int g = GETARG_Bx(i); /* global index */
511 lua_assert(ttisstring(&p->k[g]));
512 *name = svalue(&p->k[g]);
513 return "global";
514 }
515 case OP_MOVE: {
516 int a = GETARG_A(i);
517 int b = GETARG_B(i); /* move from `b' to `a' */
518 if (b < a)
519 return getobjname(L, ci, b, name); /* get name for `b' */
520 break;
521 }
522 case OP_GETTABLE: {
523 int k = GETARG_C(i); /* key index */
524 *name = kname(p, k);
525 return "field";
526 }
527 case OP_GETUPVAL: {
528 int u = GETARG_B(i); /* upvalue index */
529 *name = p->upvalues ? getstr(p->upvalues[u]) : "?";
530 return "upvalue";
531 }
532 case OP_SELF: {
533 int k = GETARG_C(i); /* key index */
534 *name = kname(p, k);
535 return "method";
536 }
537 default: break;
538 }
539 }
540 return NULL; /* no useful name found */
541 }
542
543
544 static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
545 Instruction i;
546 if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1))
547 return NULL; /* calling function is not Lua (or is unknown) */
548 ci--; /* calling function */
549 i = ci_func(ci)->l.p->code[currentpc(L, ci)];
550 if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
551 GET_OPCODE(i) == OP_TFORLOOP)
552 return getobjname(L, ci, GETARG_A(i), name);
553 else
554 return NULL; /* no useful name can be found */
555 }
556
557
558 /* only ANSI way to check whether a pointer points to an array */
559 static int isinstack (CallInfo *ci, const TValue *o) {
560 StkId p;
561 for (p = ci->base; p < ci->top; p++)
562 if (o == p) return 1;
563 return 0;
564 }
565
566
567 void luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
568 const char *name = NULL;
569 const char *t = luaT_typenames[ttype(o)];
570 const char *kind = (isinstack(L->ci, o)) ?
571 getobjname(L, L->ci, cast_int(o - L->base), &name) :
572 NULL;
573 if (kind)
574 luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)",
575 op, kind, name, t);
576 else
577 luaG_runerror(L, "attempt to %s a %s value", op, t);
578 }
579
580
581 void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
582 if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
583 lua_assert(!ttisstring(p1) && !ttisnumber(p1));
584 luaG_typeerror(L, p1, "concatenate");
585 }
586
587
588 void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
589 TValue temp;
590 if (luaV_tonumber(p1, &temp) == NULL)
591 p2 = p1; /* first operand is wrong */
592 luaG_typeerror(L, p2, "perform arithmetic on");
593 }
594
595
596 int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
597 const char *t1 = luaT_typenames[ttype(p1)];
598 const char *t2 = luaT_typenames[ttype(p2)];
599 if (t1[2] == t2[2])
600 luaG_runerror(L, "attempt to compare two %s values", t1);
601 else
602 luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
603 return 0;
604 }
605
606
607 static void addinfo (lua_State *L, const char *msg) {
608 CallInfo *ci = L->ci;
609 if (isLua(ci)) { /* is Lua code? */
610 char buff[LUA_IDSIZE]; /* add file:line information */
611 int line = currentline(L, ci);
612 luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
613 luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
614 }
615 }
616
617
618 void luaG_errormsg (lua_State *L) {
619 if (L->errfunc != 0) { /* is there an error handling function? */
620 StkId errfunc = restorestack(L, L->errfunc);
621 if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
622 setobjs2s(L, L->top, L->top - 1); /* move argument */
623 setobjs2s(L, L->top - 1, errfunc); /* push function */
624 incr_top(L);
625 luaD_call(L, L->top - 2, 1); /* call it */
626 }
627 luaD_throw(L, LUA_ERRRUN);
628 }
629
630
631 void luaG_runerror (lua_State *L, const char *fmt, ...) {
632 va_list argp;
633 va_start(argp, fmt);
634 addinfo(L, luaO_pushvfstring(L, fmt, argp));
635 va_end(argp);
636 luaG_errormsg(L);
637 }
638