| /* |
| ** $Id: ldebug.c,v 2.73 2010/09/07 19:21:39 roberto Exp roberto $ |
| ** Debug Interface |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stdarg.h> |
| #include <stddef.h> |
| #include <string.h> |
| |
| |
| #define ldebug_c |
| #define LUA_CORE |
| |
| #include "lua.h" |
| |
| #include "lapi.h" |
| #include "lcode.h" |
| #include "ldebug.h" |
| #include "ldo.h" |
| #include "lfunc.h" |
| #include "lobject.h" |
| #include "lopcodes.h" |
| #include "lstate.h" |
| #include "lstring.h" |
| #include "ltable.h" |
| #include "ltm.h" |
| #include "lvm.h" |
| |
| |
| |
| static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name); |
| |
| |
| static int currentpc (CallInfo *ci) { |
| lua_assert(isLua(ci)); |
| return pcRel(ci->u.l.savedpc, ci_func(ci)->l.p); |
| } |
| |
| |
| static int currentline (CallInfo *ci) { |
| return getfuncline(ci_func(ci)->l.p, currentpc(ci)); |
| } |
| |
| |
| /* |
| ** this function can be called asynchronous (e.g. during a signal) |
| */ |
| LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) { |
| if (func == NULL || mask == 0) { /* turn off hooks? */ |
| mask = 0; |
| func = NULL; |
| } |
| if (isLua(L->ci)) |
| L->oldpc = L->ci->u.l.savedpc; |
| L->hook = func; |
| L->basehookcount = count; |
| resethookcount(L); |
| L->hookmask = cast_byte(mask); |
| return 1; |
| } |
| |
| |
| LUA_API lua_Hook lua_gethook (lua_State *L) { |
| return L->hook; |
| } |
| |
| |
| LUA_API int lua_gethookmask (lua_State *L) { |
| return L->hookmask; |
| } |
| |
| |
| LUA_API int lua_gethookcount (lua_State *L) { |
| return L->basehookcount; |
| } |
| |
| |
| LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) { |
| int status; |
| CallInfo *ci; |
| if (level < 0) return 0; /* invalid (negative) level */ |
| lua_lock(L); |
| 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 */ |
| lua_unlock(L); |
| return status; |
| } |
| |
| |
| static const char *findlocal (lua_State *L, CallInfo *ci, int n, |
| StkId *pos) { |
| const char *name = NULL; |
| StkId base; |
| if (isLua(ci)) { |
| base = ci->u.l.base; |
| name = luaF_getlocalname(ci_func(ci)->l.p, n, currentpc(ci)); |
| } |
| else |
| base = ci->func + 1; |
| if (name == NULL) { /* no 'standard' name? */ |
| StkId limit = (ci == L->ci) ? L->top : ci->next->func; |
| if (limit - base >= n && n > 0) /* is 'n' inside 'ci' stack? */ |
| name = "(*temporary)"; /* generic name for any valid slot */ |
| else { |
| *pos = base; /* to avoid warnings */ |
| return NULL; /* no name */ |
| } |
| } |
| *pos = base + (n - 1); |
| return name; |
| } |
| |
| |
| LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) { |
| const char *name; |
| lua_lock(L); |
| if (ar == NULL) { /* information about non-active function? */ |
| if (!isLfunction(L->top - 1)) /* not a Lua function? */ |
| name = NULL; |
| else /* consider live variables at function start (parameters) */ |
| name = luaF_getlocalname(clvalue(L->top - 1)->l.p, n, 0); |
| } |
| else { /* active function; get information through 'ar' */ |
| StkId pos; |
| name = findlocal(L, ar->i_ci, n, &pos); |
| if (name) { |
| setobj2s(L, L->top, pos); |
| api_incr_top(L); |
| } |
| } |
| lua_unlock(L); |
| return name; |
| } |
| |
| |
| LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) { |
| StkId pos; |
| const char *name = findlocal(L, ar->i_ci, n, &pos); |
| lua_lock(L); |
| if (name) |
| setobjs2s(L, pos, L->top - 1); |
| L->top--; /* pop value */ |
| lua_unlock(L); |
| return name; |
| } |
| |
| |
| static void funcinfo (lua_Debug *ar, Closure *cl) { |
| if (cl == NULL || cl->c.isC) { |
| ar->source = "=[C]"; |
| ar->linedefined = -1; |
| ar->lastlinedefined = -1; |
| ar->what = "C"; |
| } |
| else { |
| Proto *p = cl->l.p; |
| ar->source = p->source ? getstr(p->source) : "=?"; |
| ar->linedefined = p->linedefined; |
| ar->lastlinedefined = p->lastlinedefined; |
| ar->what = (ar->linedefined == 0) ? "main" : "Lua"; |
| } |
| luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE); |
| } |
| |
| |
| static void collectvalidlines (lua_State *L, Closure *f) { |
| if (f == NULL || f->c.isC) { |
| setnilvalue(L->top); |
| incr_top(L); |
| } |
| else { |
| int i; |
| int *lineinfo = f->l.p->lineinfo; |
| Table *t = luaH_new(L); |
| sethvalue(L, L->top, t); |
| incr_top(L); |
| for (i=0; i<f->l.p->sizelineinfo; i++) |
| setbvalue(luaH_setint(L, t, lineinfo[i]), 1); |
| } |
| } |
| |
| |
| static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar, |
| Closure *f, CallInfo *ci) { |
| int status = 1; |
| for (; *what; what++) { |
| switch (*what) { |
| case 'S': { |
| funcinfo(ar, f); |
| break; |
| } |
| case 'l': { |
| ar->currentline = (ci && isLua(ci)) ? currentline(ci) : -1; |
| break; |
| } |
| case 'u': { |
| ar->nups = (f == NULL) ? 0 : f->c.nupvalues; |
| if (f == NULL || f->c.isC) { |
| ar->isvararg = 1; |
| ar->nparams = 0; |
| } |
| else { |
| ar->isvararg = f->l.p->is_vararg; |
| ar->nparams = f->l.p->numparams; |
| } |
| break; |
| } |
| case 't': { |
| ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0; |
| break; |
| } |
| case 'n': { |
| ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL; |
| if (ar->namewhat == NULL) { |
| ar->namewhat = ""; /* not found */ |
| ar->name = NULL; |
| } |
| break; |
| } |
| case 'L': |
| case 'f': /* handled by lua_getinfo */ |
| break; |
| default: status = 0; /* invalid option */ |
| } |
| } |
| return status; |
| } |
| |
| |
| LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) { |
| int status; |
| Closure *cl; |
| CallInfo *ci; |
| StkId func; |
| lua_lock(L); |
| if (*what == '>') { |
| ci = NULL; |
| func = L->top - 1; |
| luai_apicheck(L, ttisfunction(func)); |
| what++; /* skip the '>' */ |
| L->top--; /* pop function */ |
| } |
| else { |
| ci = ar->i_ci; |
| func = ci->func; |
| lua_assert(ttisfunction(ci->func)); |
| } |
| cl = ttisclosure(func) ? clvalue(func) : NULL; |
| status = auxgetinfo(L, what, ar, cl, ci); |
| if (strchr(what, 'f')) { |
| setobjs2s(L, L->top, func); |
| incr_top(L); |
| } |
| if (strchr(what, 'L')) |
| collectvalidlines(L, cl); |
| lua_unlock(L); |
| return status; |
| } |
| |
| |
| /* |
| ** {====================================================== |
| ** Symbolic Execution |
| ** ======================================================= |
| */ |
| |
| |
| static void kname (Proto *p, int c, int reg, const char *what, |
| const char **name) { |
| if (c == reg && what && *what == 'c') |
| return; /* index is a constant; name already correct */ |
| else if (ISK(c) && ttisstring(&p->k[INDEXK(c)])) |
| *name = svalue(&p->k[INDEXK(c)]); |
| else |
| *name = "?"; |
| } |
| |
| |
| static const char *getobjname (lua_State *L, CallInfo *ci, int reg, |
| const char **name) { |
| Proto *p = ci_func(ci)->l.p; |
| const char *what = NULL; |
| int lastpc = currentpc(ci); |
| int pc; |
| *name = luaF_getlocalname(p, reg + 1, lastpc); |
| if (*name) /* is a local? */ |
| return "local"; |
| /* else try symbolic execution */ |
| for (pc = 0; pc < lastpc; pc++) { |
| Instruction i = p->code[pc]; |
| OpCode op = GET_OPCODE(i); |
| int a = GETARG_A(i); |
| switch (op) { |
| case OP_MOVE: { |
| if (reg == a) { |
| int b = GETARG_B(i); /* move from 'b' to 'a' */ |
| if (b < a) |
| what = getobjname(L, ci, b, name); /* get name for 'b' */ |
| else what = NULL; |
| } |
| break; |
| } |
| case OP_GETTABUP: |
| case OP_GETTABLE: { |
| if (reg == a) { |
| int k = GETARG_C(i); /* key index */ |
| int t = GETARG_B(i); |
| const char *vn = (op == OP_GETTABLE) /* name of indexed variable */ |
| ? luaF_getlocalname(p, t + 1, pc) |
| : getstr(p->upvalues[t].name); |
| kname(p, k, a, what, name); |
| what = (vn && strcmp(vn, LUA_ENV) == 0) ? "global" : "field"; |
| } |
| break; |
| } |
| case OP_GETUPVAL: { |
| if (reg == a) { |
| int u = GETARG_B(i); /* upvalue index */ |
| TString *tn = p->upvalues[u].name; |
| *name = tn ? getstr(tn) : "?"; |
| what = "upvalue"; |
| } |
| break; |
| } |
| case OP_LOADK: { |
| if (reg == a) { |
| int b = GETARG_Bx(i); |
| b = (b > 0) ? b - 1 : GETARG_Ax(p->code[pc + 1]); |
| if (ttisstring(&p->k[b])) { |
| what = "constant"; |
| *name = svalue(&p->k[b]); |
| } |
| } |
| break; |
| } |
| case OP_LOADNIL: { |
| int b = GETARG_B(i); /* move from 'b' to 'a' */ |
| if (a <= reg && reg <= b) /* set registers from 'a' to 'b' */ |
| what = NULL; |
| break; |
| } |
| case OP_SELF: { |
| if (reg == a) { |
| int k = GETARG_C(i); /* key index */ |
| kname(p, k, a, what, name); |
| what = "method"; |
| } |
| break; |
| } |
| case OP_TFORCALL: { |
| if (reg >= a + 2) what = NULL; /* affect all regs above its base */ |
| break; |
| } |
| case OP_CALL: |
| case OP_TAILCALL: { |
| if (reg >= a) what = NULL; /* affect all registers above base */ |
| break; |
| } |
| case OP_JMP: { |
| int b = GETARG_sBx(i); |
| int dest = pc + 1 + b; |
| /* jump is forward and do not skip `lastpc'? */ |
| if (pc < dest && dest <= lastpc) |
| pc += b; /* do the jump */ |
| break; |
| } |
| default: |
| if (testAMode(op) && reg == a) what = NULL; |
| break; |
| } |
| } |
| return what; |
| } |
| |
| |
| static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) { |
| TMS tm; |
| Instruction i; |
| if ((ci->callstatus & CIST_TAIL) || !isLua(ci->previous)) |
| return NULL; /* calling function is not Lua (or is unknown) */ |
| ci = ci->previous; /* calling function */ |
| i = ci_func(ci)->l.p->code[currentpc(ci)]; |
| if (GET_OPCODE(i) == OP_EXTRAARG) /* extra argument? */ |
| i = ci_func(ci)->l.p->code[currentpc(ci) - 1]; /* get 'real' instruction */ |
| switch (GET_OPCODE(i)) { |
| case OP_CALL: |
| case OP_TAILCALL: |
| return getobjname(L, ci, GETARG_A(i), name); |
| case OP_TFORCALL: { |
| *name = "for iterator"; |
| return "for iterator"; |
| } |
| case OP_SELF: |
| case OP_GETTABUP: |
| case OP_GETTABLE: tm = TM_INDEX; break; |
| case OP_SETTABUP: |
| case OP_SETTABLE: tm = TM_NEWINDEX; break; |
| case OP_EQ: tm = TM_EQ; break; |
| case OP_ADD: tm = TM_ADD; break; |
| case OP_SUB: tm = TM_SUB; break; |
| case OP_MUL: tm = TM_MUL; break; |
| case OP_DIV: tm = TM_DIV; break; |
| case OP_MOD: tm = TM_MOD; break; |
| case OP_POW: tm = TM_POW; break; |
| case OP_UNM: tm = TM_UNM; break; |
| case OP_LEN: tm = TM_LEN; break; |
| case OP_LT: tm = TM_LT; break; |
| case OP_LE: tm = TM_LE; break; |
| case OP_CONCAT: tm = TM_CONCAT; break; |
| default: |
| return NULL; /* else no useful name can be found */ |
| } |
| *name = getstr(G(L)->tmname[tm]); |
| return "metamethod"; |
| } |
| |
| /* }====================================================== */ |
| |
| |
| |
| /* only ANSI way to check whether a pointer points to an array */ |
| static int isinstack (CallInfo *ci, const TValue *o) { |
| StkId p; |
| for (p = ci->u.l.base; p < ci->top; p++) |
| if (o == p) return 1; |
| return 0; |
| } |
| |
| |
| static const char *getupvalname (CallInfo *ci, const TValue *o, |
| const char **name) { |
| LClosure *c = &ci_func(ci)->l; |
| int i; |
| for (i = 0; i < c->nupvalues; i++) { |
| if (c->upvals[i]->v == o) { |
| *name = getstr(c->p->upvalues[i].name); |
| return "upvalue"; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| void luaG_typeerror (lua_State *L, const TValue *o, const char *op) { |
| CallInfo *ci = L->ci; |
| const char *name = NULL; |
| const char *t = objtypename(o); |
| const char *kind = NULL; |
| if (isLua(ci)) { |
| kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */ |
| if (!kind && isinstack(ci, o)) /* no? try a register */ |
| kind = getobjname(L, ci, cast_int(o - ci->u.l.base), &name); |
| } |
| if (kind) |
| luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)", |
| op, kind, name, t); |
| else |
| luaG_runerror(L, "attempt to %s a %s value", op, t); |
| } |
| |
| |
| void luaG_concaterror (lua_State *L, StkId p1, StkId p2) { |
| if (ttisstring(p1) || ttisnumber(p1)) p1 = p2; |
| lua_assert(!ttisstring(p1) && !ttisnumber(p2)); |
| luaG_typeerror(L, p1, "concatenate"); |
| } |
| |
| |
| void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) { |
| TValue temp; |
| if (luaV_tonumber(p1, &temp) == NULL) |
| p2 = p1; /* first operand is wrong */ |
| luaG_typeerror(L, p2, "perform arithmetic on"); |
| } |
| |
| |
| int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) { |
| const char *t1 = objtypename(p1); |
| const char *t2 = objtypename(p2); |
| if (t1 == t2) |
| luaG_runerror(L, "attempt to compare two %s values", t1); |
| else |
| luaG_runerror(L, "attempt to compare %s with %s", t1, t2); |
| return 0; |
| } |
| |
| |
| static void addinfo (lua_State *L, const char *msg) { |
| CallInfo *ci = L->ci; |
| if (isLua(ci)) { /* is Lua code? */ |
| char buff[LUA_IDSIZE]; /* add file:line information */ |
| int line = currentline(ci); |
| TString *src = ci_func(ci)->l.p->source; |
| if (src) |
| luaO_chunkid(buff, getstr(src), LUA_IDSIZE); |
| else { /* no source available; use "?" instead */ |
| buff[0] = '?'; buff[1] = '\0'; |
| } |
| luaO_pushfstring(L, "%s:%d: %s", buff, line, msg); |
| } |
| } |
| |
| |
| void luaG_errormsg (lua_State *L) { |
| if (L->errfunc != 0) { /* is there an error handling function? */ |
| StkId errfunc = restorestack(L, L->errfunc); |
| if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR); |
| setobjs2s(L, L->top, L->top - 1); /* move argument */ |
| setobjs2s(L, L->top - 1, errfunc); /* push function */ |
| incr_top(L); |
| luaD_call(L, L->top - 2, 1, 0); /* call it */ |
| } |
| luaD_throw(L, LUA_ERRRUN); |
| } |
| |
| |
| void luaG_runerror (lua_State *L, const char *fmt, ...) { |
| va_list argp; |
| va_start(argp, fmt); |
| addinfo(L, luaO_pushvfstring(L, fmt, argp)); |
| va_end(argp); |
| luaG_errormsg(L); |
| } |
| |