--- /dev/null
+/*
+** $Id: lapi.c,v 2.171 2013/03/16 21:10:18 roberto Exp $
+** Lua API
+** See Copyright Notice in lua.h
+*/
+
+
+#include <stdarg.h>
+#include <string.h>
+
+#define lapi_c
+#define LUA_CORE
+
+#include "lua.h"
+
+#include "lapi.h"
+#include "ldebug.h"
+#include "ldo.h"
+#include "lfunc.h"
+#include "lgc.h"
+#include "lmem.h"
+#include "lobject.h"
+#include "lstate.h"
+#include "lstring.h"
+#include "ltable.h"
+#include "ltm.h"
+#include "lundump.h"
+#include "lvm.h"
+
+
+
+const char lua_ident[] =
+ "$LuaVersion: " LUA_COPYRIGHT " $"
+ "$LuaAuthors: " LUA_AUTHORS " $";
+
+
+/* value at a non-valid index */
+#define NONVALIDVALUE cast(TValue *, luaO_nilobject)
+
+/* corresponding test */
+#define isvalid(o) ((o) != luaO_nilobject)
+
+/* test for pseudo index */
+#define ispseudo(i) ((i) <= LUA_REGISTRYINDEX)
+
+/* test for valid but not pseudo index */
+#define isstackindex(i, o) (isvalid(o) && !ispseudo(i))
+
+#define api_checkvalidindex(L, o) api_check(L, isvalid(o), "invalid index")
+
+#define api_checkstackindex(L, i, o) \
+ api_check(L, isstackindex(i, o), "index not in the stack")
+
+
+static TValue *index2addr (lua_State *L, int idx) {
+ CallInfo *ci = L->ci;
+ if (idx > 0) {
+ TValue *o = ci->func + idx;
+ api_check(L, idx <= ci->top - (ci->func + 1), "unacceptable index");
+ if (o >= L->top) return NONVALIDVALUE;
+ else return o;
+ }
+ else if (!ispseudo(idx)) { /* negative index */
+ api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
+ return L->top + idx;
+ }
+ else if (idx == LUA_REGISTRYINDEX)
+ return &G(L)->l_registry;
+ else { /* upvalues */
+ idx = LUA_REGISTRYINDEX - idx;
+ api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");
+ if (ttislcf(ci->func)) /* light C function? */
+ return NONVALIDVALUE; /* it has no upvalues */
+ else {
+ CClosure *func = clCvalue(ci->func);
+ return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : NONVALIDVALUE;
+ }
+ }
+}
+
+
+/*
+** to be called by 'lua_checkstack' in protected mode, to grow stack
+** capturing memory errors
+*/
+static void growstack (lua_State *L, void *ud) {
+ int size = *(int *)ud;
+ luaD_growstack(L, size);
+}
+
+
+LUA_API int lua_checkstack (lua_State *L, int size) {
+ int res;
+ CallInfo *ci = L->ci;
+ lua_lock(L);
+ if (L->stack_last - L->top > size) /* stack large enough? */
+ res = 1; /* yes; check is OK */
+ else { /* no; need to grow stack */
+ int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;
+ if (inuse > LUAI_MAXSTACK - size) /* can grow without overflow? */
+ res = 0; /* no */
+ else /* try to grow stack */
+ res = (luaD_rawrunprotected(L, &growstack, &size) == LUA_OK);
+ }
+ if (res && ci->top < L->top + size)
+ ci->top = L->top + size; /* adjust frame top */
+ lua_unlock(L);
+ return res;
+}
+
+
+LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
+ int i;
+ if (from == to) return;
+ lua_lock(to);
+ api_checknelems(from, n);
+ api_check(from, G(from) == G(to), "moving among independent states");
+ api_check(from, to->ci->top - to->top >= n, "not enough elements to move");
+ from->top -= n;
+ for (i = 0; i < n; i++) {
+ setobj2s(to, to->top++, from->top + i);
+ }
+ lua_unlock(to);
+}
+
+
+LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
+ lua_CFunction old;
+ lua_lock(L);
+ old = G(L)->panic;
+ G(L)->panic = panicf;
+ lua_unlock(L);
+ return old;
+}
+
+
+LUA_API const lua_Number *lua_version (lua_State *L) {
+ static const lua_Number version = LUA_VERSION_NUM;
+ if (L == NULL) return &version;
+ else return G(L)->version;
+}
+
+
+
+/*
+** basic stack manipulation
+*/
+
+
+/*
+** convert an acceptable stack index into an absolute index
+*/
+LUA_API int lua_absindex (lua_State *L, int idx) {
+ return (idx > 0 || ispseudo(idx))
+ ? idx
+ : cast_int(L->top - L->ci->func + idx);
+}
+
+
+LUA_API int lua_gettop (lua_State *L) {
+ return cast_int(L->top - (L->ci->func + 1));
+}
+
+
+LUA_API void lua_settop (lua_State *L, int idx) {
+ StkId func = L->ci->func;
+ lua_lock(L);
+ if (idx >= 0) {
+ api_check(L, idx <= L->stack_last - (func + 1), "new top too large");
+ while (L->top < (func + 1) + idx)
+ setnilvalue(L->top++);
+ L->top = (func + 1) + idx;
+ }
+ else {
+ api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
+ L->top += idx+1; /* `subtract' index (index is negative) */
+ }
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_remove (lua_State *L, int idx) {
+ StkId p;
+ lua_lock(L);
+ p = index2addr(L, idx);
+ api_checkstackindex(L, idx, p);
+ while (++p < L->top) setobjs2s(L, p-1, p);
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_insert (lua_State *L, int idx) {
+ StkId p;
+ StkId q;
+ lua_lock(L);
+ p = index2addr(L, idx);
+ api_checkstackindex(L, idx, p);
+ for (q = L->top; q > p; q--) /* use L->top as a temporary */
+ setobjs2s(L, q, q - 1);
+ setobjs2s(L, p, L->top);
+ lua_unlock(L);
+}
+
+
+static void moveto (lua_State *L, TValue *fr, int idx) {
+ TValue *to = index2addr(L, idx);
+ api_checkvalidindex(L, to);
+ setobj(L, to, fr);
+ if (idx < LUA_REGISTRYINDEX) /* function upvalue? */
+ luaC_barrier(L, clCvalue(L->ci->func), fr);
+ /* LUA_REGISTRYINDEX does not need gc barrier
+ (collector revisits it before finishing collection) */
+}
+
+
+LUA_API void lua_replace (lua_State *L, int idx) {
+ lua_lock(L);
+ api_checknelems(L, 1);
+ moveto(L, L->top - 1, idx);
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {
+ TValue *fr;
+ lua_lock(L);
+ fr = index2addr(L, fromidx);
+ moveto(L, fr, toidx);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushvalue (lua_State *L, int idx) {
+ lua_lock(L);
+ setobj2s(L, L->top, index2addr(L, idx));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+
+/*
+** access functions (stack -> C)
+*/
+
+
+LUA_API int lua_type (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ return (isvalid(o) ? ttypenv(o) : LUA_TNONE);
+}
+
+
+LUA_API const char *lua_typename (lua_State *L, int t) {
+ UNUSED(L);
+ return ttypename(t);
+}
+
+
+LUA_API int lua_iscfunction (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ return (ttislcf(o) || (ttisCclosure(o)));
+}
+
+
+LUA_API int lua_isnumber (lua_State *L, int idx) {
+ TValue n;
+ const TValue *o = index2addr(L, idx);
+ return tonumber(o, &n);
+}
+
+
+LUA_API int lua_isstring (lua_State *L, int idx) {
+ int t = lua_type(L, idx);
+ return (t == LUA_TSTRING || t == LUA_TNUMBER);
+}
+
+
+LUA_API int lua_isuserdata (lua_State *L, int idx) {
+ const TValue *o = index2addr(L, idx);
+ return (ttisuserdata(o) || ttislightuserdata(o));
+}
+
+
+LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
+ StkId o1 = index2addr(L, index1);
+ StkId o2 = index2addr(L, index2);
+ return (isvalid(o1) && isvalid(o2)) ? luaV_rawequalobj(o1, o2) : 0;
+}
+
+
+LUA_API void lua_arith (lua_State *L, int op) {
+ StkId o1; /* 1st operand */
+ StkId o2; /* 2nd operand */
+ lua_lock(L);
+ if (op != LUA_OPUNM) /* all other operations expect two operands */
+ api_checknelems(L, 2);
+ else { /* for unary minus, add fake 2nd operand */
+ api_checknelems(L, 1);
+ setobjs2s(L, L->top, L->top - 1);
+ L->top++;
+ }
+ o1 = L->top - 2;
+ o2 = L->top - 1;
+ if (ttisnumber(o1) && ttisnumber(o2)) {
+ setnvalue(o1, luaO_arith(op, nvalue(o1), nvalue(o2)));
+ }
+ else
+ luaV_arith(L, o1, o1, o2, cast(TMS, op - LUA_OPADD + TM_ADD));
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
+ StkId o1, o2;
+ int i = 0;
+ lua_lock(L); /* may call tag method */
+ o1 = index2addr(L, index1);
+ o2 = index2addr(L, index2);
+ if (isvalid(o1) && isvalid(o2)) {
+ switch (op) {
+ case LUA_OPEQ: i = equalobj(L, o1, o2); break;
+ case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
+ case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;
+ default: api_check(L, 0, "invalid option");
+ }
+ }
+ lua_unlock(L);
+ return i;
+}
+
+
+LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *isnum) {
+ TValue n;
+ const TValue *o = index2addr(L, idx);
+ if (tonumber(o, &n)) {
+ if (isnum) *isnum = 1;
+ return nvalue(o);
+ }
+ else {
+ if (isnum) *isnum = 0;
+ return 0;
+ }
+}
+
+
+LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *isnum) {
+ TValue n;
+ const TValue *o = index2addr(L, idx);
+ if (tonumber(o, &n)) {
+ lua_Integer res;
+ lua_Number num = nvalue(o);
+ lua_number2integer(res, num);
+ if (isnum) *isnum = 1;
+ return res;
+ }
+ else {
+ if (isnum) *isnum = 0;
+ return 0;
+ }
+}
+
+
+LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *isnum) {
+ TValue n;
+ const TValue *o = index2addr(L, idx);
+ if (tonumber(o, &n)) {
+ lua_Unsigned res;
+ lua_Number num = nvalue(o);
+ lua_number2unsigned(res, num);
+ if (isnum) *isnum = 1;
+ return res;
+ }
+ else {
+ if (isnum) *isnum = 0;
+ return 0;
+ }
+}
+
+
+LUA_API int lua_toboolean (lua_State *L, int idx) {
+ const TValue *o = index2addr(L, idx);
+ return !l_isfalse(o);
+}
+
+
+LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
+ StkId o = index2addr(L, idx);
+ if (!ttisstring(o)) {
+ lua_lock(L); /* `luaV_tostring' may create a new string */
+ if (!luaV_tostring(L, o)) { /* conversion failed? */
+ if (len != NULL) *len = 0;
+ lua_unlock(L);
+ return NULL;
+ }
+ luaC_checkGC(L);
+ o = index2addr(L, idx); /* previous call may reallocate the stack */
+ lua_unlock(L);
+ }
+ if (len != NULL) *len = tsvalue(o)->len;
+ return svalue(o);
+}
+
+
+LUA_API size_t lua_rawlen (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ switch (ttypenv(o)) {
+ case LUA_TSTRING: return tsvalue(o)->len;
+ case LUA_TUSERDATA: return uvalue(o)->len;
+ case LUA_TTABLE: return luaH_getn(hvalue(o));
+ default: return 0;
+ }
+}
+
+
+LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ if (ttislcf(o)) return fvalue(o);
+ else if (ttisCclosure(o))
+ return clCvalue(o)->f;
+ else return NULL; /* not a C function */
+}
+
+
+LUA_API void *lua_touserdata (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ switch (ttypenv(o)) {
+ case LUA_TUSERDATA: return (rawuvalue(o) + 1);
+ case LUA_TLIGHTUSERDATA: return pvalue(o);
+ default: return NULL;
+ }
+}
+
+
+LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ return (!ttisthread(o)) ? NULL : thvalue(o);
+}
+
+
+LUA_API const void *lua_topointer (lua_State *L, int idx) {
+ StkId o = index2addr(L, idx);
+ switch (ttype(o)) {
+ case LUA_TTABLE: return hvalue(o);
+ case LUA_TLCL: return clLvalue(o);
+ case LUA_TCCL: return clCvalue(o);
+ case LUA_TLCF: return cast(void *, cast(size_t, fvalue(o)));
+ case LUA_TTHREAD: return thvalue(o);
+ case LUA_TUSERDATA:
+ case LUA_TLIGHTUSERDATA:
+ return lua_touserdata(L, idx);
+ default: return NULL;
+ }
+}
+
+
+
+/*
+** push functions (C -> stack)
+*/
+
+
+LUA_API void lua_pushnil (lua_State *L) {
+ lua_lock(L);
+ setnilvalue(L->top);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
+ lua_lock(L);
+ setnvalue(L->top, n);
+ luai_checknum(L, L->top,
+ luaG_runerror(L, "C API - attempt to push a signaling NaN"));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
+ lua_lock(L);
+ setnvalue(L->top, cast_num(n));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
+ lua_Number n;
+ lua_lock(L);
+ n = lua_unsigned2number(u);
+ setnvalue(L->top, n);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {
+ TString *ts;
+ lua_lock(L);
+ luaC_checkGC(L);
+ ts = luaS_newlstr(L, s, len);
+ setsvalue2s(L, L->top, ts);
+ api_incr_top(L);
+ lua_unlock(L);
+ return getstr(ts);
+}
+
+
+LUA_API const char *lua_pushstring (lua_State *L, const char *s) {
+ if (s == NULL) {
+ lua_pushnil(L);
+ return NULL;
+ }
+ else {
+ TString *ts;
+ lua_lock(L);
+ luaC_checkGC(L);
+ ts = luaS_new(L, s);
+ setsvalue2s(L, L->top, ts);
+ api_incr_top(L);
+ lua_unlock(L);
+ return getstr(ts);
+ }
+}
+
+
+LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
+ va_list argp) {
+ const char *ret;
+ lua_lock(L);
+ luaC_checkGC(L);
+ ret = luaO_pushvfstring(L, fmt, argp);
+ lua_unlock(L);
+ return ret;
+}
+
+
+LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
+ const char *ret;
+ va_list argp;
+ lua_lock(L);
+ luaC_checkGC(L);
+ va_start(argp, fmt);
+ ret = luaO_pushvfstring(L, fmt, argp);
+ va_end(argp);
+ lua_unlock(L);
+ return ret;
+}
+
+
+LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
+ lua_lock(L);
+ if (n == 0) {
+ setfvalue(L->top, fn);
+ }
+ else {
+ Closure *cl;
+ api_checknelems(L, n);
+ api_check(L, n <= MAXUPVAL, "upvalue index too large");
+ luaC_checkGC(L);
+ cl = luaF_newCclosure(L, n);
+ cl->c.f = fn;
+ L->top -= n;
+ while (n--)
+ setobj2n(L, &cl->c.upvalue[n], L->top + n);
+ setclCvalue(L, L->top, cl);
+ }
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushboolean (lua_State *L, int b) {
+ lua_lock(L);
+ setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
+ lua_lock(L);
+ setpvalue(L->top, p);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_pushthread (lua_State *L) {
+ lua_lock(L);
+ setthvalue(L, L->top, L);
+ api_incr_top(L);
+ lua_unlock(L);
+ return (G(L)->mainthread == L);
+}
+
+
+
+/*
+** get functions (Lua -> stack)
+*/
+
+
+LUA_API void lua_getglobal (lua_State *L, const char *var) {
+ Table *reg = hvalue(&G(L)->l_registry);
+ const TValue *gt; /* global table */
+ lua_lock(L);
+ gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
+ setsvalue2s(L, L->top++, luaS_new(L, var));
+ luaV_gettable(L, gt, L->top - 1, L->top - 1);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_gettable (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ luaV_gettable(L, t, L->top - 1, L->top - 1);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
+ StkId t;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ setsvalue2s(L, L->top, luaS_new(L, k));
+ api_incr_top(L);
+ luaV_gettable(L, t, L->top - 1, L->top - 1);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawget (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
+ StkId t;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ setobj2s(L, L->top, luaH_getint(hvalue(t), n));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) {
+ StkId t;
+ TValue k;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ setpvalue(&k, cast(void *, p));
+ setobj2s(L, L->top, luaH_get(hvalue(t), &k));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
+ Table *t;
+ lua_lock(L);
+ luaC_checkGC(L);
+ t = luaH_new(L);
+ sethvalue(L, L->top, t);
+ api_incr_top(L);
+ if (narray > 0 || nrec > 0)
+ luaH_resize(L, t, narray, nrec);
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_getmetatable (lua_State *L, int objindex) {
+ const TValue *obj;
+ Table *mt = NULL;
+ int res;
+ lua_lock(L);
+ obj = index2addr(L, objindex);
+ switch (ttypenv(obj)) {
+ case LUA_TTABLE:
+ mt = hvalue(obj)->metatable;
+ break;
+ case LUA_TUSERDATA:
+ mt = uvalue(obj)->metatable;
+ break;
+ default:
+ mt = G(L)->mt[ttypenv(obj)];
+ break;
+ }
+ if (mt == NULL)
+ res = 0;
+ else {
+ sethvalue(L, L->top, mt);
+ api_incr_top(L);
+ res = 1;
+ }
+ lua_unlock(L);
+ return res;
+}
+
+
+LUA_API void lua_getuservalue (lua_State *L, int idx) {
+ StkId o;
+ lua_lock(L);
+ o = index2addr(L, idx);
+ api_check(L, ttisuserdata(o), "userdata expected");
+ if (uvalue(o)->env) {
+ sethvalue(L, L->top, uvalue(o)->env);
+ } else
+ setnilvalue(L->top);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+/*
+** set functions (stack -> Lua)
+*/
+
+
+LUA_API void lua_setglobal (lua_State *L, const char *var) {
+ Table *reg = hvalue(&G(L)->l_registry);
+ const TValue *gt; /* global table */
+ lua_lock(L);
+ api_checknelems(L, 1);
+ gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
+ setsvalue2s(L, L->top++, luaS_new(L, var));
+ luaV_settable(L, gt, L->top - 1, L->top - 2);
+ L->top -= 2; /* pop value and key */
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_settable (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ api_checknelems(L, 2);
+ t = index2addr(L, idx);
+ luaV_settable(L, t, L->top - 2, L->top - 1);
+ L->top -= 2; /* pop index and value */
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
+ StkId t;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ t = index2addr(L, idx);
+ setsvalue2s(L, L->top++, luaS_new(L, k));
+ luaV_settable(L, t, L->top - 1, L->top - 2);
+ L->top -= 2; /* pop value and key */
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawset (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ api_checknelems(L, 2);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
+ invalidateTMcache(hvalue(t));
+ luaC_barrierback(L, gcvalue(t), L->top-1);
+ L->top -= 2;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
+ StkId t;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ luaH_setint(L, hvalue(t), n, L->top - 1);
+ luaC_barrierback(L, gcvalue(t), L->top-1);
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
+ StkId t;
+ TValue k;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ setpvalue(&k, cast(void *, p));
+ setobj2t(L, luaH_set(L, hvalue(t), &k), L->top - 1);
+ luaC_barrierback(L, gcvalue(t), L->top - 1);
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_setmetatable (lua_State *L, int objindex) {
+ TValue *obj;
+ Table *mt;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ obj = index2addr(L, objindex);
+ if (ttisnil(L->top - 1))
+ mt = NULL;
+ else {
+ api_check(L, ttistable(L->top - 1), "table expected");
+ mt = hvalue(L->top - 1);
+ }
+ switch (ttypenv(obj)) {
+ case LUA_TTABLE: {
+ hvalue(obj)->metatable = mt;
+ if (mt) {
+ luaC_objbarrierback(L, gcvalue(obj), mt);
+ luaC_checkfinalizer(L, gcvalue(obj), mt);
+ }
+ break;
+ }
+ case LUA_TUSERDATA: {
+ uvalue(obj)->metatable = mt;
+ if (mt) {
+ luaC_objbarrier(L, rawuvalue(obj), mt);
+ luaC_checkfinalizer(L, gcvalue(obj), mt);
+ }
+ break;
+ }
+ default: {
+ G(L)->mt[ttypenv(obj)] = mt;
+ break;
+ }
+ }
+ L->top--;
+ lua_unlock(L);
+ return 1;
+}
+
+
+LUA_API void lua_setuservalue (lua_State *L, int idx) {
+ StkId o;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ o = index2addr(L, idx);
+ api_check(L, ttisuserdata(o), "userdata expected");
+ if (ttisnil(L->top - 1))
+ uvalue(o)->env = NULL;
+ else {
+ api_check(L, ttistable(L->top - 1), "table expected");
+ uvalue(o)->env = hvalue(L->top - 1);
+ luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
+ }
+ L->top--;
+ lua_unlock(L);
+}
+
+
+/*
+** `load' and `call' functions (run Lua code)
+*/
+
+
+#define checkresults(L,na,nr) \
+ api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \
+ "results from function overflow current stack size")
+
+
+LUA_API int lua_getctx (lua_State *L, int *ctx) {
+ if (L->ci->callstatus & CIST_YIELDED) {
+ if (ctx) *ctx = L->ci->u.c.ctx;
+ return L->ci->u.c.status;
+ }
+ else return LUA_OK;
+}
+
+
+LUA_API void lua_callk (lua_State *L, int nargs, int nresults, int ctx,
+ lua_CFunction k) {
+ StkId func;
+ lua_lock(L);
+ api_check(L, k == NULL || !isLua(L->ci),
+ "cannot use continuations inside hooks");
+ api_checknelems(L, nargs+1);
+ api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
+ checkresults(L, nargs, nresults);
+ func = L->top - (nargs+1);
+ if (k != NULL && L->nny == 0) { /* need to prepare continuation? */
+ L->ci->u.c.k = k; /* save continuation */
+ L->ci->u.c.ctx = ctx; /* save context */
+ luaD_call(L, func, nresults, 1); /* do the call */
+ }
+ else /* no continuation or no yieldable */
+ luaD_call(L, func, nresults, 0); /* just do the call */
+ adjustresults(L, nresults);
+ lua_unlock(L);
+}
+
+
+
+/*
+** Execute a protected call.
+*/
+struct CallS { /* data to `f_call' */
+ StkId func;
+ int nresults;
+};
+
+
+static void f_call (lua_State *L, void *ud) {
+ struct CallS *c = cast(struct CallS *, ud);
+ luaD_call(L, c->func, c->nresults, 0);
+}
+
+
+
+LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,
+ int ctx, lua_CFunction k) {
+ struct CallS c;
+ int status;
+ ptrdiff_t func;
+ lua_lock(L);
+ api_check(L, k == NULL || !isLua(L->ci),
+ "cannot use continuations inside hooks");
+ api_checknelems(L, nargs+1);
+ api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
+ checkresults(L, nargs, nresults);
+ if (errfunc == 0)
+ func = 0;
+ else {
+ StkId o = index2addr(L, errfunc);
+ api_checkstackindex(L, errfunc, o);
+ func = savestack(L, o);
+ }
+ c.func = L->top - (nargs+1); /* function to be called */
+ if (k == NULL || L->nny > 0) { /* no continuation or no yieldable? */
+ c.nresults = nresults; /* do a 'conventional' protected call */
+ status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
+ }
+ else { /* prepare continuation (call is already protected by 'resume') */
+ CallInfo *ci = L->ci;
+ ci->u.c.k = k; /* save continuation */
+ ci->u.c.ctx = ctx; /* save context */
+ /* save information for error recovery */
+ ci->extra = savestack(L, c.func);
+ ci->u.c.old_allowhook = L->allowhook;
+ ci->u.c.old_errfunc = L->errfunc;
+ L->errfunc = func;
+ /* mark that function may do error recovery */
+ ci->callstatus |= CIST_YPCALL;
+ luaD_call(L, c.func, nresults, 1); /* do the call */
+ ci->callstatus &= ~CIST_YPCALL;
+ L->errfunc = ci->u.c.old_errfunc;
+ status = LUA_OK; /* if it is here, there were no errors */
+ }
+ adjustresults(L, nresults);
+ lua_unlock(L);
+ return status;
+}
+
+
+LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
+ const char *chunkname, const char *mode) {
+ ZIO z;
+ int status;
+ lua_lock(L);
+ if (!chunkname) chunkname = "?";
+ luaZ_init(L, &z, reader, data);
+ status = luaD_protectedparser(L, &z, chunkname, mode);
+ if (status == LUA_OK) { /* no errors? */
+ LClosure *f = clLvalue(L->top - 1); /* get newly created function */
+ if (f->nupvalues == 1) { /* does it have one upvalue? */
+ /* get global table from registry */
+ Table *reg = hvalue(&G(L)->l_registry);
+ const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
+ /* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
+ setobj(L, f->upvals[0]->v, gt);
+ luaC_barrier(L, f->upvals[0], gt);
+ }
+ }
+ lua_unlock(L);
+ return status;
+}
+
+
+LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
+ int status;
+ TValue *o;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ o = L->top - 1;
+ if (isLfunction(o))
+ status = luaU_dump(L, getproto(o), writer, data, 0);
+ else
+ status = 1;
+ lua_unlock(L);
+ return status;
+}
+
+
+LUA_API int lua_status (lua_State *L) {
+ return L->status;
+}
+
+
+/*
+** Garbage-collection function
+*/
+
+LUA_API int lua_gc (lua_State *L, int what, int data) {
+ int res = 0;
+ global_State *g;
+ lua_lock(L);
+ g = G(L);
+ switch (what) {
+ case LUA_GCSTOP: {
+ g->gcrunning = 0;
+ break;
+ }
+ case LUA_GCRESTART: {
+ luaE_setdebt(g, 0);
+ g->gcrunning = 1;
+ break;
+ }
+ case LUA_GCCOLLECT: {
+ luaC_fullgc(L, 0);
+ break;
+ }
+ case LUA_GCCOUNT: {
+ /* GC values are expressed in Kbytes: #bytes/2^10 */
+ res = cast_int(gettotalbytes(g) >> 10);
+ break;
+ }
+ case LUA_GCCOUNTB: {
+ res = cast_int(gettotalbytes(g) & 0x3ff);
+ break;
+ }
+ case LUA_GCSTEP: {
+ if (g->gckind == KGC_GEN) { /* generational mode? */
+ res = (g->GCestimate == 0); /* true if it will do major collection */
+ luaC_forcestep(L); /* do a single step */
+ }
+ else {
+ lu_mem debt = cast(lu_mem, data) * 1024 - GCSTEPSIZE;
+ if (g->gcrunning)
+ debt += g->GCdebt; /* include current debt */
+ luaE_setdebt(g, debt);
+ luaC_forcestep(L);
+ if (g->gcstate == GCSpause) /* end of cycle? */
+ res = 1; /* signal it */
+ }
+ break;
+ }
+ case LUA_GCSETPAUSE: {
+ res = g->gcpause;
+ g->gcpause = data;
+ break;
+ }
+ case LUA_GCSETMAJORINC: {
+ res = g->gcmajorinc;
+ g->gcmajorinc = data;
+ break;
+ }
+ case LUA_GCSETSTEPMUL: {
+ res = g->gcstepmul;
+ g->gcstepmul = data;
+ break;
+ }
+ case LUA_GCISRUNNING: {
+ res = g->gcrunning;
+ break;
+ }
+ case LUA_GCGEN: { /* change collector to generational mode */
+ luaC_changemode(L, KGC_GEN);
+ break;
+ }
+ case LUA_GCINC: { /* change collector to incremental mode */
+ luaC_changemode(L, KGC_NORMAL);
+ break;
+ }
+ default: res = -1; /* invalid option */
+ }
+ lua_unlock(L);
+ return res;
+}
+
+
+
+/*
+** miscellaneous functions
+*/
+
+
+LUA_API int lua_error (lua_State *L) {
+ lua_lock(L);
+ api_checknelems(L, 1);
+ luaG_errormsg(L);
+ /* code unreachable; will unlock when control actually leaves the kernel */
+ return 0; /* to avoid warnings */
+}
+
+
+LUA_API int lua_next (lua_State *L, int idx) {
+ StkId t;
+ int more;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ api_check(L, ttistable(t), "table expected");
+ more = luaH_next(L, hvalue(t), L->top - 1);
+ if (more) {
+ api_incr_top(L);
+ }
+ else /* no more elements */
+ L->top -= 1; /* remove key */
+ lua_unlock(L);
+ return more;
+}
+
+
+LUA_API void lua_concat (lua_State *L, int n) {
+ lua_lock(L);
+ api_checknelems(L, n);
+ if (n >= 2) {
+ luaC_checkGC(L);
+ luaV_concat(L, n);
+ }
+ else if (n == 0) { /* push empty string */
+ setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
+ api_incr_top(L);
+ }
+ /* else n == 1; nothing to do */
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_len (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ t = index2addr(L, idx);
+ luaV_objlen(L, L->top, t);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
+ lua_Alloc f;
+ lua_lock(L);
+ if (ud) *ud = G(L)->ud;
+ f = G(L)->frealloc;
+ lua_unlock(L);
+ return f;
+}
+
+
+LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
+ lua_lock(L);
+ G(L)->ud = ud;
+ G(L)->frealloc = f;
+ lua_unlock(L);
+}
+
+
+LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
+ Udata *u;
+ lua_lock(L);
+ luaC_checkGC(L);
+ u = luaS_newudata(L, size, NULL);
+ setuvalue(L, L->top, u);
+ api_incr_top(L);
+ lua_unlock(L);
+ return u + 1;
+}
+
+
+
+static const char *aux_upvalue (StkId fi, int n, TValue **val,
+ GCObject **owner) {
+ switch (ttype(fi)) {
+ case LUA_TCCL: { /* C closure */
+ CClosure *f = clCvalue(fi);
+ if (!(1 <= n && n <= f->nupvalues)) return NULL;
+ *val = &f->upvalue[n-1];
+ if (owner) *owner = obj2gco(f);
+ return "";
+ }
+ case LUA_TLCL: { /* Lua closure */
+ LClosure *f = clLvalue(fi);
+ TString *name;
+ Proto *p = f->p;
+ if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
+ *val = f->upvals[n-1]->v;
+ if (owner) *owner = obj2gco(f->upvals[n - 1]);
+ name = p->upvalues[n-1].name;
+ return (name == NULL) ? "" : getstr(name);
+ }
+ default: return NULL; /* not a closure */
+ }
+}
+
+
+LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
+ const char *name;
+ TValue *val = NULL; /* to avoid warnings */
+ lua_lock(L);
+ name = aux_upvalue(index2addr(L, funcindex), n, &val, NULL);
+ if (name) {
+ setobj2s(L, L->top, val);
+ api_incr_top(L);
+ }
+ lua_unlock(L);
+ return name;
+}
+
+
+LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
+ const char *name;
+ TValue *val = NULL; /* to avoid warnings */
+ GCObject *owner = NULL; /* to avoid warnings */
+ StkId fi;
+ lua_lock(L);
+ fi = index2addr(L, funcindex);
+ api_checknelems(L, 1);
+ name = aux_upvalue(fi, n, &val, &owner);
+ if (name) {
+ L->top--;
+ setobj(L, val, L->top);
+ luaC_barrier(L, owner, L->top);
+ }
+ lua_unlock(L);
+ return name;
+}
+
+
+static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
+ LClosure *f;
+ StkId fi = index2addr(L, fidx);
+ api_check(L, ttisLclosure(fi), "Lua function expected");
+ f = clLvalue(fi);
+ api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
+ if (pf) *pf = f;
+ return &f->upvals[n - 1]; /* get its upvalue pointer */
+}
+
+
+LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
+ StkId fi = index2addr(L, fidx);
+ switch (ttype(fi)) {
+ case LUA_TLCL: { /* lua closure */
+ return *getupvalref(L, fidx, n, NULL);
+ }
+ case LUA_TCCL: { /* C closure */
+ CClosure *f = clCvalue(fi);
+ api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
+ return &f->upvalue[n - 1];
+ }
+ default: {
+ api_check(L, 0, "closure expected");
+ return NULL;
+ }
+ }
+}
+
+
+LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
+ int fidx2, int n2) {
+ LClosure *f1;
+ UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
+ UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
+ *up1 = *up2;
+ luaC_objbarrier(L, f1, *up2);
+}
+
projects / proxmark3-svn / blobdiff