| /* |
| ** $Id: ldebug.c,v 2.29.1.6 2008/05/08 16:56:26 roberto Exp $ |
| ** 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 (lua_State *L, CallInfo *ci) { |
| if (!isLua(ci)) return -1; /* function is not a Lua function? */ |
| if (ci == L->ci) |
| ci->savedpc = L->savedpc; |
| return pcRel(ci->savedpc, ci_func(ci)->l.p); |
| } |
| |
| |
| static int currentline (lua_State *L, CallInfo *ci) { |
| int pc = currentpc(L, ci); |
| if (pc < 0) |
| return -1; /* only active lua functions have current-line information */ |
| else |
| return getline(ci_func(ci)->l.p, pc); |
| } |
| |
| |
| /* |
| ** 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; |
| } |
| 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; |
| lua_lock(L); |
| for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) { |
| level--; |
| if (f_isLua(ci)) /* Lua function? */ |
| level -= ci->tailcalls; /* skip lost tail calls */ |
| } |
| if (level == 0 && ci > L->base_ci) { /* level found? */ |
| status = 1; |
| ar->i_ci = cast_int(ci - L->base_ci); |
| } |
| else if (level < 0) { /* level is of a lost tail call? */ |
| status = 1; |
| ar->i_ci = 0; |
| } |
| else status = 0; /* no such level */ |
| lua_unlock(L); |
| return status; |
| } |
| |
| |
| static Proto *getluaproto (CallInfo *ci) { |
| return (isLua(ci) ? ci_func(ci)->l.p : NULL); |
| } |
| |
| |
| static const char *findlocal (lua_State *L, CallInfo *ci, int n) { |
| const char *name; |
| Proto *fp = getluaproto(ci); |
| if (fp && (name = luaF_getlocalname(fp, n, currentpc(L, ci))) != NULL) |
| return name; /* is a local variable in a Lua function */ |
| else { |
| StkId limit = (ci == L->ci) ? L->top : (ci+1)->func; |
| if (limit - ci->base >= n && n > 0) /* is 'n' inside 'ci' stack? */ |
| return "(*temporary)"; |
| else |
| return NULL; |
| } |
| } |
| |
| |
| LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) { |
| CallInfo *ci = L->base_ci + ar->i_ci; |
| const char *name = findlocal(L, ci, n); |
| lua_lock(L); |
| if (name) |
| luaA_pushobject(L, ci->base + (n - 1)); |
| lua_unlock(L); |
| return name; |
| } |
| |
| |
| LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) { |
| CallInfo *ci = L->base_ci + ar->i_ci; |
| const char *name = findlocal(L, ci, n); |
| lua_lock(L); |
| if (name) |
| setobjs2s(L, ci->base + (n - 1), L->top - 1); |
| L->top--; /* pop value */ |
| lua_unlock(L); |
| return name; |
| } |
| |
| |
| static void funcinfo (lua_Debug *ar, Closure *cl) { |
| if (cl->c.isC) { |
| ar->source = "=[C]"; |
| ar->linedefined = -1; |
| ar->lastlinedefined = -1; |
| ar->what = "C"; |
| } |
| else { |
| ar->source = getstr(cl->l.p->source); |
| ar->linedefined = cl->l.p->linedefined; |
| ar->lastlinedefined = cl->l.p->lastlinedefined; |
| ar->what = (ar->linedefined == 0) ? "main" : "Lua"; |
| } |
| luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE); |
| } |
| |
| |
| static void info_tailcall (lua_Debug *ar) { |
| ar->name = ar->namewhat = ""; |
| ar->what = "tail"; |
| ar->lastlinedefined = ar->linedefined = ar->currentline = -1; |
| ar->source = "=(tail call)"; |
| luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE); |
| ar->nups = 0; |
| } |
| |
| |
| static void collectvalidlines (lua_State *L, Closure *f) { |
| if (f == NULL || f->c.isC) { |
| setnilvalue(L->top); |
| } |
| else { |
| Table *t = luaH_new(L, 0, 0); |
| int *lineinfo = f->l.p->lineinfo; |
| int i; |
| for (i=0; i<f->l.p->sizelineinfo; i++) |
| setbvalue(luaH_setnum(L, t, lineinfo[i]), 1); |
| sethvalue(L, L->top, t); |
| } |
| incr_top(L); |
| } |
| |
| |
| static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar, |
| Closure *f, CallInfo *ci) { |
| int status = 1; |
| if (f == NULL) { |
| info_tailcall(ar); |
| return status; |
| } |
| for (; *what; what++) { |
| switch (*what) { |
| case 'S': { |
| funcinfo(ar, f); |
| break; |
| } |
| case 'l': { |
| ar->currentline = (ci) ? currentline(L, ci) : -1; |
| break; |
| } |
| case 'u': { |
| ar->nups = f->c.nupvalues; |
| 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 *f = NULL; |
| CallInfo *ci = NULL; |
| lua_lock(L); |
| if (*what == '>') { |
| StkId func = L->top - 1; |
| luai_apicheck(L, ttisfunction(func)); |
| what++; /* skip the '>' */ |
| f = clvalue(func); |
| L->top--; /* pop function */ |
| } |
| else if (ar->i_ci != 0) { /* no tail call? */ |
| ci = L->base_ci + ar->i_ci; |
| lua_assert(ttisfunction(ci->func)); |
| f = clvalue(ci->func); |
| } |
| status = auxgetinfo(L, what, ar, f, ci); |
| if (strchr(what, 'f')) { |
| if (f == NULL) setnilvalue(L->top); |
| else setclvalue(L, L->top, f); |
| incr_top(L); |
| } |
| if (strchr(what, 'L')) |
| collectvalidlines(L, f); |
| lua_unlock(L); |
| return status; |
| } |
| |
| |
| /* |
| ** {====================================================== |
| ** Symbolic Execution and code checker |
| ** ======================================================= |
| */ |
| |
| #define check(x) if (!(x)) return 0; |
| |
| #define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode) |
| |
| #define checkreg(pt,reg) check((reg) < (pt)->maxstacksize) |
| |
| |
| |
| static int precheck (const Proto *pt) { |
| check(pt->maxstacksize <= MAXSTACK); |
| check(pt->numparams+(pt->is_vararg & VARARG_HASARG) <= pt->maxstacksize); |
| check(!(pt->is_vararg & VARARG_NEEDSARG) || |
| (pt->is_vararg & VARARG_HASARG)); |
| check(pt->sizeupvalues <= pt->nups); |
| check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0); |
| check(pt->sizecode > 0 && GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN); |
| return 1; |
| } |
| |
| |
| #define checkopenop(pt,pc) luaG_checkopenop((pt)->code[(pc)+1]) |
| |
| int luaG_checkopenop (Instruction i) { |
| switch (GET_OPCODE(i)) { |
| case OP_CALL: |
| case OP_TAILCALL: |
| case OP_RETURN: |
| case OP_SETLIST: { |
| check(GETARG_B(i) == 0); |
| return 1; |
| } |
| default: return 0; /* invalid instruction after an open call */ |
| } |
| } |
| |
| |
| static int checkArgMode (const Proto *pt, int r, enum OpArgMask mode) { |
| switch (mode) { |
| case OpArgN: check(r == 0); break; |
| case OpArgU: break; |
| case OpArgR: checkreg(pt, r); break; |
| case OpArgK: |
| check(ISK(r) ? INDEXK(r) < pt->sizek : r < pt->maxstacksize); |
| break; |
| } |
| return 1; |
| } |
| |
| |
| static Instruction symbexec (const Proto *pt, int lastpc, int reg) { |
| int pc; |
| int last; /* stores position of last instruction that changed `reg' */ |
| last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */ |
| check(precheck(pt)); |
| for (pc = 0; pc < lastpc; pc++) { |
| Instruction i = pt->code[pc]; |
| OpCode op = GET_OPCODE(i); |
| int a = GETARG_A(i); |
| int b = 0; |
| int c = 0; |
| check(op < NUM_OPCODES); |
| checkreg(pt, a); |
| switch (getOpMode(op)) { |
| case iABC: { |
| b = GETARG_B(i); |
| c = GETARG_C(i); |
| check(checkArgMode(pt, b, getBMode(op))); |
| check(checkArgMode(pt, c, getCMode(op))); |
| break; |
| } |
| case iABx: { |
| b = GETARG_Bx(i); |
| if (getBMode(op) == OpArgK) check(b < pt->sizek); |
| break; |
| } |
| case iAsBx: { |
| b = GETARG_sBx(i); |
| if (getBMode(op) == OpArgR) { |
| int dest = pc+1+b; |
| check(0 <= dest && dest < pt->sizecode); |
| if (dest > 0) { |
| int j; |
| /* check that it does not jump to a setlist count; this |
| is tricky, because the count from a previous setlist may |
| have the same value of an invalid setlist; so, we must |
| go all the way back to the first of them (if any) */ |
| for (j = 0; j < dest; j++) { |
| Instruction d = pt->code[dest-1-j]; |
| if (!(GET_OPCODE(d) == OP_SETLIST && GETARG_C(d) == 0)) break; |
| } |
| /* if 'j' is even, previous value is not a setlist (even if |
| it looks like one) */ |
| check((j&1) == 0); |
| } |
| } |
| break; |
| } |
| } |
| if (testAMode(op)) { |
| if (a == reg) last = pc; /* change register `a' */ |
| } |
| if (testTMode(op)) { |
| check(pc+2 < pt->sizecode); /* check skip */ |
| check(GET_OPCODE(pt->code[pc+1]) == OP_JMP); |
| } |
| switch (op) { |
| case OP_LOADBOOL: { |
| if (c == 1) { /* does it jump? */ |
| check(pc+2 < pt->sizecode); /* check its jump */ |
| check(GET_OPCODE(pt->code[pc+1]) != OP_SETLIST || |
| GETARG_C(pt->code[pc+1]) != 0); |
| } |
| break; |
| } |
| case OP_LOADNIL: { |
| if (a <= reg && reg <= b) |
| last = pc; /* set registers from `a' to `b' */ |
| break; |
| } |
| case OP_GETUPVAL: |
| case OP_SETUPVAL: { |
| check(b < pt->nups); |
| break; |
| } |
| case OP_GETGLOBAL: |
| case OP_SETGLOBAL: { |
| check(ttisstring(&pt->k[b])); |
| break; |
| } |
| case OP_SELF: { |
| checkreg(pt, a+1); |
| if (reg == a+1) last = pc; |
| break; |
| } |
| case OP_CONCAT: { |
| check(b < c); /* at least two operands */ |
| break; |
| } |
| case OP_TFORLOOP: { |
| check(c >= 1); /* at least one result (control variable) */ |
| checkreg(pt, a+2+c); /* space for results */ |
| if (reg >= a+2) last = pc; /* affect all regs above its base */ |
| break; |
| } |
| case OP_FORLOOP: |
| case OP_FORPREP: |
| checkreg(pt, a+3); |
| /* go through */ |
| case OP_JMP: { |
| int dest = pc+1+b; |
| /* not full check and jump is forward and do not skip `lastpc'? */ |
| if (reg != NO_REG && pc < dest && dest <= lastpc) |
| pc += b; /* do the jump */ |
| break; |
| } |
| case OP_CALL: |
| case OP_TAILCALL: { |
| if (b != 0) { |
| checkreg(pt, a+b-1); |
| } |
| c--; /* c = num. returns */ |
| if (c == LUA_MULTRET) { |
| check(checkopenop(pt, pc)); |
| } |
| else if (c != 0) |
| checkreg(pt, a+c-1); |
| if (reg >= a) last = pc; /* affect all registers above base */ |
| break; |
| } |
| case OP_RETURN: { |
| b--; /* b = num. returns */ |
| if (b > 0) checkreg(pt, a+b-1); |
| break; |
| } |
| case OP_SETLIST: { |
| if (b > 0) checkreg(pt, a + b); |
| if (c == 0) { |
| pc++; |
| check(pc < pt->sizecode - 1); |
| } |
| break; |
| } |
| case OP_CLOSURE: { |
| int nup, j; |
| check(b < pt->sizep); |
| nup = pt->p[b]->nups; |
| check(pc + nup < pt->sizecode); |
| for (j = 1; j <= nup; j++) { |
| OpCode op1 = GET_OPCODE(pt->code[pc + j]); |
| check(op1 == OP_GETUPVAL || op1 == OP_MOVE); |
| } |
| if (reg != NO_REG) /* tracing? */ |
| pc += nup; /* do not 'execute' these pseudo-instructions */ |
| break; |
| } |
| case OP_VARARG: { |
| check((pt->is_vararg & VARARG_ISVARARG) && |
| !(pt->is_vararg & VARARG_NEEDSARG)); |
| b--; |
| if (b == LUA_MULTRET) check(checkopenop(pt, pc)); |
| checkreg(pt, a+b-1); |
| break; |
| } |
| default: break; |
| } |
| } |
| return pt->code[last]; |
| } |
| |
| #undef check |
| #undef checkjump |
| #undef checkreg |
| |
| /* }====================================================== */ |
| |
| |
| int luaG_checkcode (const Proto *pt) { |
| return (symbexec(pt, pt->sizecode, NO_REG) != 0); |
| } |
| |
| |
| static const char *kname (Proto *p, int c) { |
| if (ISK(c) && ttisstring(&p->k[INDEXK(c)])) |
| return svalue(&p->k[INDEXK(c)]); |
| else |
| return "?"; |
| } |
| |
| |
| static const char *getobjname (lua_State *L, CallInfo *ci, int stackpos, |
| const char **name) { |
| if (isLua(ci)) { /* a Lua function? */ |
| Proto *p = ci_func(ci)->l.p; |
| int pc = currentpc(L, ci); |
| Instruction i; |
| *name = luaF_getlocalname(p, stackpos+1, pc); |
| if (*name) /* is a local? */ |
| return "local"; |
| i = symbexec(p, pc, stackpos); /* try symbolic execution */ |
| lua_assert(pc != -1); |
| switch (GET_OPCODE(i)) { |
| case OP_GETGLOBAL: { |
| int g = GETARG_Bx(i); /* global index */ |
| lua_assert(ttisstring(&p->k[g])); |
| *name = svalue(&p->k[g]); |
| return "global"; |
| } |
| case OP_MOVE: { |
| int a = GETARG_A(i); |
| int b = GETARG_B(i); /* move from `b' to `a' */ |
| if (b < a) |
| return getobjname(L, ci, b, name); /* get name for `b' */ |
| break; |
| } |
| case OP_GETTABLE: { |
| int k = GETARG_C(i); /* key index */ |
| *name = kname(p, k); |
| return "field"; |
| } |
| case OP_GETUPVAL: { |
| int u = GETARG_B(i); /* upvalue index */ |
| *name = p->upvalues ? getstr(p->upvalues[u]) : "?"; |
| return "upvalue"; |
| } |
| case OP_SELF: { |
| int k = GETARG_C(i); /* key index */ |
| *name = kname(p, k); |
| return "method"; |
| } |
| default: break; |
| } |
| } |
| return NULL; /* no useful name found */ |
| } |
| |
| |
| static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) { |
| Instruction i; |
| if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1)) |
| return NULL; /* calling function is not Lua (or is unknown) */ |
| ci--; /* calling function */ |
| i = ci_func(ci)->l.p->code[currentpc(L, ci)]; |
| if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL || |
| GET_OPCODE(i) == OP_TFORLOOP) |
| return getobjname(L, ci, GETARG_A(i), name); |
| else |
| return NULL; /* no useful name can be found */ |
| } |
| |
| |
| /* 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->base; p < ci->top; p++) |
| if (o == p) return 1; |
| return 0; |
| } |
| |
| |
| void luaG_typeerror (lua_State *L, const TValue *o, const char *op) { |
| const char *name = NULL; |
| const char *t = luaT_typenames[ttype(o)]; |
| const char *kind = (isinstack(L->ci, o)) ? |
| getobjname(L, L->ci, cast_int(o - L->base), &name) : |
| NULL; |
| 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(p1)); |
| 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 = luaT_typenames[ttype(p1)]; |
| const char *t2 = luaT_typenames[ttype(p2)]; |
| if (t1[2] == t2[2]) |
| 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(L, ci); |
| luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE); |
| 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); /* 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); |
| } |
| |