| /* |
| ** $Id: ldebug.c,v 1.86 2001/06/28 19:58:57 roberto Exp roberto $ |
| ** Debug Interface |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stdlib.h> |
| |
| #define LUA_PRIVATE |
| #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 "luadebug.h" |
| #include "lvm.h" |
| |
| |
| |
| static const l_char *getfuncname (lua_State *L, CallInfo *ci, |
| const l_char **name); |
| |
| |
| |
| static int isLmark (CallInfo *ci) { |
| lua_assert(ci == NULL || ttype(ci->base - 1) == LUA_TFUNCTION); |
| return (ci && ci->prev && !ci_func(ci)->isC); |
| } |
| |
| |
| LUA_API lua_Hook lua_setcallhook (lua_State *L, lua_Hook func) { |
| lua_Hook oldhook; |
| lua_lock(L); |
| oldhook = L->callhook; |
| L->callhook = func; |
| lua_unlock(L); |
| return oldhook; |
| } |
| |
| |
| LUA_API lua_Hook lua_setlinehook (lua_State *L, lua_Hook func) { |
| lua_Hook oldhook; |
| lua_lock(L); |
| oldhook = L->linehook; |
| L->linehook = func; |
| lua_unlock(L); |
| return oldhook; |
| } |
| |
| |
| static CallInfo *ci_stack (lua_State *L, StkId obj) { |
| CallInfo *ci = L->ci; |
| while (ci->base > obj) ci = ci->prev; |
| return (ci != &L->basefunc) ? ci : NULL; |
| } |
| |
| |
| LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) { |
| CallInfo *ci; |
| int status; |
| lua_lock(L); |
| ci = L->ci; |
| while (level-- && ci != &L->basefunc) { |
| lua_assert(ci->base > ci->prev->base); |
| ci = ci->prev; |
| } |
| if (ci == &L->basefunc) status = 0; /* there is no such level */ |
| else { |
| ar->_ci = ci; |
| status = 1; |
| } |
| lua_unlock(L); |
| return status; |
| } |
| |
| |
| int luaG_getline (int *lineinfo, int pc, int refline, int *prefi) { |
| int refi; |
| if (lineinfo == NULL || pc == -1) |
| return -1; /* no line info or function is not active */ |
| refi = prefi ? *prefi : 0; |
| if (lineinfo[refi] < 0) |
| refline += -lineinfo[refi++]; |
| lua_assert(lineinfo[refi] >= 0); |
| while (lineinfo[refi] > pc) { |
| refline--; |
| refi--; |
| if (lineinfo[refi] < 0) |
| refline -= -lineinfo[refi--]; |
| lua_assert(lineinfo[refi] >= 0); |
| } |
| for (;;) { |
| int nextline = refline + 1; |
| int nextref = refi + 1; |
| if (lineinfo[nextref] < 0) |
| nextline += -lineinfo[nextref++]; |
| lua_assert(lineinfo[nextref] >= 0); |
| if (lineinfo[nextref] > pc) |
| break; |
| refline = nextline; |
| refi = nextref; |
| } |
| if (prefi) *prefi = refi; |
| return refline; |
| } |
| |
| |
| static int currentpc (CallInfo *ci) { |
| lua_assert(isLmark(ci)); |
| if (ci->pc) |
| return (*ci->pc - ci_func(ci)->f.l->code) - 1; |
| else |
| return -1; /* function is not active */ |
| } |
| |
| |
| static int currentline (CallInfo *ci) { |
| if (!isLmark(ci)) |
| return -1; /* only active lua functions have current-line information */ |
| else { |
| int *lineinfo = ci_func(ci)->f.l->lineinfo; |
| return luaG_getline(lineinfo, currentpc(ci), 1, NULL); |
| } |
| } |
| |
| |
| |
| static Proto *getluaproto (CallInfo *ci) { |
| return (isLmark(ci) ? ci_func(ci)->f.l : NULL); |
| } |
| |
| |
| LUA_API const l_char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) { |
| const l_char *name; |
| CallInfo *ci; |
| Proto *fp; |
| lua_lock(L); |
| name = NULL; |
| ci = ar->_ci; |
| fp = getluaproto(ci); |
| if (fp) { /* is a Lua function? */ |
| name = luaF_getlocalname(fp, n, currentpc(ci)); |
| if (name) |
| luaA_pushobject(L, ci->base+(n-1)); /* push value */ |
| } |
| lua_unlock(L); |
| return name; |
| } |
| |
| |
| LUA_API const l_char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) { |
| const l_char *name; |
| CallInfo *ci; |
| Proto *fp; |
| lua_lock(L); |
| name = NULL; |
| ci = ar->_ci; |
| fp = getluaproto(ci); |
| L->top--; /* pop new value */ |
| if (fp) { /* is a Lua function? */ |
| name = luaF_getlocalname(fp, n, currentpc(ci)); |
| if (!name || name[0] == l_c('(')) /* `(' starts private locals */ |
| name = NULL; |
| else |
| setobj(ci->base+(n-1), L->top); |
| } |
| lua_unlock(L); |
| return name; |
| } |
| |
| |
| static void infoLproto (lua_Debug *ar, Proto *f) { |
| ar->source = getstr(f->source); |
| ar->linedefined = f->lineDefined; |
| ar->what = l_s("Lua"); |
| } |
| |
| |
| static void funcinfo (lua_State *L, lua_Debug *ar, StkId func) { |
| Closure *cl; |
| if (ttype(func) == LUA_TFUNCTION) |
| cl = clvalue(func); |
| else { |
| luaD_error(L, l_s("value for `lua_getinfo' is not a function")); |
| cl = NULL; /* to avoid warnings */ |
| } |
| if (cl->isC) { |
| ar->source = l_s("=C"); |
| ar->linedefined = -1; |
| ar->what = l_s("C"); |
| } |
| else |
| infoLproto(ar, cl->f.l); |
| luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE); |
| if (ar->linedefined == 0) |
| ar->what = l_s("main"); |
| } |
| |
| |
| static const l_char *travtagmethods (global_State *G, const TObject *o) { |
| if (ttype(o) == LUA_TFUNCTION) { |
| int e; |
| for (e=0; e<TM_N; e++) { |
| int t; |
| for (t=0; t<G->ntag; t++) |
| if (clvalue(o) == luaT_gettm(G, t, e)) |
| return luaT_eventname[e]; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| static const l_char *travglobals (lua_State *L, const TObject *o) { |
| Hash *g = L->gt; |
| int i; |
| for (i=0; i<g->size; i++) { |
| if (luaO_equalObj(o, val(node(g, i))) && |
| ttype(key(node(g, i))) == LUA_TSTRING) |
| return getstr(tsvalue(key(node(g, i)))); |
| } |
| return NULL; |
| } |
| |
| |
| static void getname (lua_State *L, const TObject *f, lua_Debug *ar) { |
| /* try to find a name for given function */ |
| if ((ar->name = travglobals(L, f)) != NULL) |
| ar->namewhat = l_s("global"); |
| /* not found: try tag methods */ |
| else if ((ar->name = travtagmethods(G(L), f)) != NULL) |
| ar->namewhat = l_s("tag-method"); |
| else ar->namewhat = l_s(""); /* not found at all */ |
| } |
| |
| |
| LUA_API int lua_getinfo (lua_State *L, const l_char *what, lua_Debug *ar) { |
| StkId f; |
| CallInfo *ci; |
| int status = 1; |
| lua_lock(L); |
| if (*what != l_c('>')) { /* function is active? */ |
| ci = ar->_ci; |
| f = ci->base - 1; |
| } |
| else { |
| what++; /* skip the `>' */ |
| ci = NULL; |
| f = L->top - 1; |
| } |
| for (; *what; what++) { |
| switch (*what) { |
| case l_c('S'): { |
| funcinfo(L, ar, f); |
| break; |
| } |
| case l_c('l'): { |
| ar->currentline = currentline(ci); |
| break; |
| } |
| case l_c('u'): { |
| ar->nups = (ttype(f) == LUA_TFUNCTION) ? clvalue(f)->nupvalues : 0; |
| break; |
| } |
| case l_c('n'): { |
| ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL; |
| if (ar->namewhat == NULL) |
| getname(L, f, ar); |
| break; |
| } |
| case l_c('f'): { |
| setobj(L->top, f); |
| incr_top; /* push function */ |
| break; |
| } |
| default: status = 0; /* invalid option */ |
| } |
| } |
| if (!ci) L->top--; /* pop function */ |
| 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 checklineinfo (const Proto *pt) { |
| int *lineinfo = pt->lineinfo; |
| if (lineinfo == NULL) return 1; |
| check(pt->sizelineinfo >= 2 && lineinfo[pt->sizelineinfo-1] == MAX_INT); |
| if (*lineinfo < 0) lineinfo++; |
| check(*lineinfo == 0); |
| return 1; |
| } |
| |
| |
| static int precheck (const Proto *pt) { |
| check(checklineinfo(pt)); |
| check(pt->maxstacksize <= MAXSTACK); |
| check(pt->numparams+pt->is_vararg <= pt->maxstacksize); |
| check(GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN); |
| return 1; |
| } |
| |
| |
| static int checkopenop (Instruction i) { |
| OpCode op = GET_OPCODE(i); |
| switch (op) { |
| case OP_CALL: |
| case OP_RETURN: { |
| check(GETARG_B(i) == NO_REG); |
| return 1; |
| } |
| case OP_SETLISTO: return 1; |
| default: return 0; /* invalid instruction after an open call */ |
| } |
| } |
| |
| |
| static Instruction luaG_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) */ |
| if (reg == NO_REG) /* full check? */ |
| check(precheck(pt)); |
| for (pc = 0; pc < lastpc; pc++) { |
| const Instruction i = pt->code[pc]; |
| OpCode op = GET_OPCODE(i); |
| int a = GETARG_A(i); |
| int b = 0; |
| int c = 0; |
| checkreg(pt, a); |
| switch (getOpMode(op)) { |
| case iABC: { |
| b = GETARG_B(i); |
| c = GETARG_C(i); |
| if (testOpMode(op, OpModeBreg)) |
| checkreg(pt, b); |
| if (testOpMode(op, OpModeCreg)) |
| check(c < pt->maxstacksize || |
| (c >= MAXSTACK && c-MAXSTACK < pt->sizek)); |
| break; |
| } |
| case iABc: { |
| b = GETARG_Bc(i); |
| if (testOpMode(op, OpModeK)) check(b < pt->sizek); |
| break; |
| } |
| case iAsBc: { |
| b = GETARG_sBc(i); |
| break; |
| } |
| } |
| if (testOpMode(op, OpModesetA)) { |
| if (a == reg) last = pc; /* change register `a' */ |
| } |
| if (testOpMode(op, OpModeT)) |
| check(GET_OPCODE(pt->code[pc+1]) == OP_CJMP); |
| switch (op) { |
| case OP_LOADNIL: { |
| if (a <= reg && reg <= b) |
| last = pc; /* set registers from `a' to `b' */ |
| break; |
| } |
| case OP_LOADUPVAL: { |
| check(b < pt->nupvalues); |
| break; |
| } |
| case OP_GETGLOBAL: |
| case OP_SETGLOBAL: { |
| check(ttype(&pt->k[b]) == LUA_TSTRING); |
| break; |
| } |
| case OP_SELF: { |
| checkreg(pt, a+1); |
| if (reg == a+1) last = pc; |
| break; |
| } |
| case OP_CONCAT: { |
| /* `c' is a register, and at least two operands */ |
| check(c < MAXSTACK && b < c); |
| break; |
| } |
| case OP_JMP: |
| case OP_CJMP: { |
| int dest = pc+1+b; |
| check(0 <= dest && dest < pt->sizecode); |
| /* 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_NILJMP: { |
| check(pc+2 < pt->sizecode); /* check its jump */ |
| break; |
| } |
| case OP_CALL: { |
| if (b != NO_REG) { |
| checkreg(pt, a+b); |
| } |
| if (c == NO_REG) { |
| check(checkopenop(pt->code[pc+1])); |
| } |
| else if (c != 0) |
| checkreg(pt, a+c-1); |
| if (reg >= a) last = pc; /* affect all registers above base */ |
| break; |
| } |
| case OP_RETURN: { |
| if (b != NO_REG && b != 0) |
| checkreg(pt, a+b-1); |
| break; |
| } |
| case OP_FORPREP: |
| case OP_TFORPREP: { |
| int dest = pc-b; /* jump is negated here */ |
| check(0 <= dest && dest < pt->sizecode && |
| GET_OPCODE(pt->code[dest]) == op+1); |
| break; |
| } |
| case OP_FORLOOP: |
| case OP_TFORLOOP: { |
| int dest = pc+b; |
| check(0 <= dest && dest < pt->sizecode && |
| pt->code[dest] == SET_OPCODE(i, op-1)); |
| checkreg(pt, a + ((op == OP_FORLOOP) ? 2 : 3)); |
| break; |
| } |
| case OP_SETLIST: { |
| checkreg(pt, a + (b&(LFIELDS_PER_FLUSH-1)) + 1); |
| break; |
| } |
| case OP_CLOSURE: { |
| check(b < pt->sizep); |
| checkreg(pt, a + pt->p[b]->nupvalues - 1); |
| break; |
| } |
| default: break; |
| } |
| } |
| return pt->code[last]; |
| } |
| |
| /* }====================================================== */ |
| |
| |
| int luaG_checkcode (const Proto *pt) { |
| return luaG_symbexec(pt, pt->sizecode, NO_REG); |
| } |
| |
| |
| static const l_char *getobjname (lua_State *L, StkId obj, const l_char **name) { |
| CallInfo *ci = ci_stack(L, obj); |
| if (isLmark(ci)) { /* an active Lua function? */ |
| Proto *p = ci_func(ci)->f.l; |
| int pc = currentpc(ci); |
| int stackpos = obj - ci->base; |
| Instruction i; |
| *name = luaF_getlocalname(p, stackpos+1, pc); |
| if (*name) /* is a local? */ |
| return l_s("local"); |
| i = luaG_symbexec(p, pc, stackpos); /* try symbolic execution */ |
| lua_assert(pc != -1); |
| switch (GET_OPCODE(i)) { |
| case OP_GETGLOBAL: { |
| lua_assert(ttype(&p->k[GETARG_Bc(i)]) == LUA_TSTRING); |
| *name = svalue(&p->k[GETARG_Bc(i)]); |
| return l_s("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->base+b, name); /* get name for `b' */ |
| break; |
| } |
| case OP_GETTABLE: |
| case OP_SELF: { |
| int c = GETARG_C(i) - MAXSTACK; |
| if (c >= 0 && ttype(&p->k[c]) == LUA_TSTRING) { |
| *name = svalue(&p->k[c]); |
| return l_s("field"); |
| } |
| break; |
| } |
| default: break; |
| } |
| } |
| return NULL; /* no useful name found */ |
| } |
| |
| |
| static const l_char *getfuncname (lua_State *L, CallInfo *ci, |
| const l_char **name) { |
| ci = ci->prev; /* calling function */ |
| if (ci == &L->basefunc || !isLmark(ci)) |
| return NULL; /* not an active Lua function */ |
| else { |
| Proto *p = ci_func(ci)->f.l; |
| int pc = currentpc(ci); |
| Instruction i; |
| if (pc == -1) return NULL; /* function is not activated */ |
| i = p->code[pc]; |
| return (GET_OPCODE(i) == OP_CALL |
| ? getobjname(L, ci->base+GETARG_A(i), name) |
| : NULL); /* no useful name found */ |
| } |
| } |
| |
| |
| void luaG_typeerror (lua_State *L, StkId o, const l_char *op) { |
| const l_char *name; |
| const l_char *kind = getobjname(L, o, &name); |
| const l_char *t = luaT_typename(G(L), o); |
| if (kind) |
| luaO_verror(L, l_s("attempt to %.30s %.20s `%.40s' (a %.10s value)"), |
| op, kind, name, t); |
| else |
| luaO_verror(L, l_s("attempt to %.30s a %.10s value"), op, t); |
| } |
| |
| |
| void luaG_concaterror (lua_State *L, StkId p1, StkId p2) { |
| if (ttype(p1) == LUA_TSTRING) p1 = p2; |
| lua_assert(ttype(p1) != LUA_TSTRING); |
| luaG_typeerror(L, p1, l_s("concat")); |
| } |
| |
| |
| void luaG_aritherror (lua_State *L, StkId p1, TObject *p2) { |
| TObject temp; |
| if (luaV_tonumber(p1, &temp) != NULL) |
| p1 = p2; /* first operand is OK; error is in the second */ |
| luaG_typeerror(L, p1, l_s("perform arithmetic on")); |
| } |
| |
| |
| void luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2) { |
| const l_char *t1 = luaT_typename(G(L), p1); |
| const l_char *t2 = luaT_typename(G(L), p2); |
| if (t1[2] == t2[2]) |
| luaO_verror(L, l_s("attempt to compare two %.10s values"), t1); |
| else |
| luaO_verror(L, l_s("attempt to compare %.10s with %.10s"), t1, t2); |
| } |
| |