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/*
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** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
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** Lua API
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** See Copyright Notice in lua.h
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*/
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#include <assert.h>
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#include <math.h>
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#include <stdarg.h>
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#include <string.h>
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#define lapi_c
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#define LUA_CORE
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#include "lua.h"
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#include "lapi.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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#include "lundump.h"
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#include "lvm.h"
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const char lua_ident[] =
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"$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
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"$Authors: " LUA_AUTHORS " $\n"
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"$URL: www.lua.org $\n";
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10017
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#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
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2812
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10017
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#define api_checkvalidindex(L, i) api_check(L, (i) != luaO_nilobject)
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#define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
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static TValue *index2adr (lua_State *L, int idx) {
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if (idx > 0) {
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TValue *o = L->base + (idx - 1);
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api_check(L, idx <= L->ci->top - L->base);
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if (o >= L->top) return cast(TValue *, luaO_nilobject);
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else return o;
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}
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else if (idx > LUA_REGISTRYINDEX) {
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api_check(L, idx != 0 && -idx <= L->top - L->base);
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return L->top + idx;
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}
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else switch (idx) { /* pseudo-indices */
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case LUA_REGISTRYINDEX: return registry(L);
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case LUA_ENVIRONINDEX: {
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Closure *func = curr_func(L);
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sethvalue(L, &L->env, func->c.env);
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return &L->env;
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}
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case LUA_GLOBALSINDEX: return gt(L);
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default: {
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Closure *func = curr_func(L);
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idx = LUA_GLOBALSINDEX - idx;
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return (idx <= func->c.nupvalues)
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? &func->c.upvalue[idx-1]
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: cast(TValue *, luaO_nilobject);
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}
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}
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}
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static Table *getcurrenv (lua_State *L) {
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if (L->ci == L->base_ci) /* no enclosing function? */
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return hvalue(gt(L)); /* use global table as environment */
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else {
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Closure *func = curr_func(L);
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return func->c.env;
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}
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}
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void luaA_pushobject (lua_State *L, const TValue *o) {
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setobj2s(L, L->top, o);
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api_incr_top(L);
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}
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LUA_API int lua_checkstack (lua_State *L, int size) {
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int res = 1;
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lua_lock(L);
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if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
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res = 0; /* stack overflow */
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else if (size > 0) {
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luaD_checkstack(L, size);
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if (L->ci->top < L->top + size)
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L->ci->top = L->top + size;
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}
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lua_unlock(L);
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return res;
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}
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LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
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int i;
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if (from == to) return;
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lua_lock(to);
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api_checknelems(from, n);
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api_check(from, G(from) == G(to));
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api_check(from, to->ci->top - to->top >= n);
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from->top -= n;
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for (i = 0; i < n; i++) {
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setobj2s(to, to->top++, from->top + i);
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}
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lua_unlock(to);
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}
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LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
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to->nCcalls = from->nCcalls;
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}
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LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
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lua_CFunction old;
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lua_lock(L);
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old = G(L)->panic;
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G(L)->panic = panicf;
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lua_unlock(L);
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return old;
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}
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LUA_API lua_State *lua_newthread (lua_State *L) {
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lua_State *L1;
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lua_lock(L);
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luaC_checkGC(L);
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L1 = luaE_newthread(L);
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setthvalue(L, L->top, L1);
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api_incr_top(L);
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lua_unlock(L);
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luai_userstatethread(L, L1);
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return L1;
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}
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/*
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** basic stack manipulation
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*/
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LUA_API int lua_gettop (lua_State *L) {
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return cast_int(L->top - L->base);
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}
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LUA_API void lua_settop (lua_State *L, int idx) {
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lua_lock(L);
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if (idx >= 0) {
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api_check(L, idx <= L->stack_last - L->base);
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while (L->top < L->base + idx)
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setnilvalue(L->top++);
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L->top = L->base + idx;
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}
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else {
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api_check(L, -(idx+1) <= (L->top - L->base));
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L->top += idx+1; /* `subtract' index (index is negative) */
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}
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lua_unlock(L);
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}
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LUA_API void lua_remove (lua_State *L, int idx) {
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StkId p;
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lua_lock(L);
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p = index2adr(L, idx);
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api_checkvalidindex(L, p);
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while (++p < L->top) setobjs2s(L, p-1, p);
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L->top--;
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lua_unlock(L);
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}
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LUA_API void lua_insert (lua_State *L, int idx) {
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StkId p;
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StkId q;
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lua_lock(L);
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p = index2adr(L, idx);
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api_checkvalidindex(L, p);
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for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
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setobjs2s(L, p, L->top);
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lua_unlock(L);
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}
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LUA_API void lua_replace (lua_State *L, int idx) {
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StkId o;
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lua_lock(L);
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/* explicit test for incompatible code */
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if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
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luaG_runerror(L, "no calling environment");
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api_checknelems(L, 1);
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o = index2adr(L, idx);
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api_checkvalidindex(L, o);
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if (idx == LUA_ENVIRONINDEX) {
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Closure *func = curr_func(L);
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api_check(L, ttistable(L->top - 1));
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func->c.env = hvalue(L->top - 1);
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luaC_barrier(L, func, L->top - 1);
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}
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else {
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setobj(L, o, L->top - 1);
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if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
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luaC_barrier(L, curr_func(L), L->top - 1);
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}
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L->top--;
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lua_unlock(L);
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}
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LUA_API void lua_pushvalue (lua_State *L, int idx) {
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lua_lock(L);
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setobj2s(L, L->top, index2adr(L, idx));
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api_incr_top(L);
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lua_unlock(L);
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}
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/*
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** access functions (stack -> C)
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*/
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LUA_API int lua_type (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
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}
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LUA_API const char *lua_typename (lua_State *L, int t) {
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UNUSED(L);
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return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
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}
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LUA_API int lua_iscfunction (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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return iscfunction(o);
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}
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LUA_API int lua_isnumber (lua_State *L, int idx) {
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TValue n;
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const TValue *o = index2adr(L, idx);
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return tonumber(o, &n);
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}
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LUA_API int lua_isstring (lua_State *L, int idx) {
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int t = lua_type(L, idx);
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return (t == LUA_TSTRING || t == LUA_TNUMBER);
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}
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LUA_API int lua_isuserdata (lua_State *L, int idx) {
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const TValue *o = index2adr(L, idx);
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return (ttisuserdata(o) || ttislightuserdata(o));
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}
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LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
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StkId o1 = index2adr(L, index1);
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StkId o2 = index2adr(L, index2);
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return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
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: luaO_rawequalObj(o1, o2);
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}
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LUA_API int lua_equal (lua_State *L, int index1, int index2) {
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StkId o1, o2;
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int i;
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lua_lock(L); /* may call tag method */
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o1 = index2adr(L, index1);
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o2 = index2adr(L, index2);
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i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
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lua_unlock(L);
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return i;
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}
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LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
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StkId o1, o2;
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int i;
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lua_lock(L); /* may call tag method */
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o1 = index2adr(L, index1);
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o2 = index2adr(L, index2);
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i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
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: luaV_lessthan(L, o1, o2);
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lua_unlock(L);
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return i;
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}
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LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
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TValue n;
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const TValue *o = index2adr(L, idx);
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if (tonumber(o, &n))
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return nvalue(o);
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else
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return 0;
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}
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LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
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TValue n;
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const TValue *o = index2adr(L, idx);
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if (tonumber(o, &n)) {
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lua_Integer res;
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lua_Number num = nvalue(o);
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lua_number2integer(res, num);
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return res;
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}
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else
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return 0;
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}
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LUA_API int lua_toboolean (lua_State *L, int idx) {
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const TValue *o = index2adr(L, idx);
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return !l_isfalse(o);
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}
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LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
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StkId o = index2adr(L, idx);
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if (!ttisstring(o)) {
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lua_lock(L); /* `luaV_tostring' may create a new string */
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if (!luaV_tostring(L, o)) { /* conversion failed? */
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if (len != NULL) *len = 0;
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lua_unlock(L);
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return NULL;
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}
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luaC_checkGC(L);
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o = index2adr(L, idx); /* previous call may reallocate the stack */
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lua_unlock(L);
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}
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if (len != NULL) *len = tsvalue(o)->len;
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return svalue(o);
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}
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LUA_API size_t lua_objlen (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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switch (ttype(o)) {
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case LUA_TSTRING: return tsvalue(o)->len;
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case LUA_TUSERDATA: return uvalue(o)->len;
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case LUA_TTABLE: return luaH_getn(hvalue(o));
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case LUA_TNUMBER: {
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size_t l;
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lua_lock(L); /* `luaV_tostring' may create a new string */
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l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
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lua_unlock(L);
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return l;
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}
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default: return 0;
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}
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}
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LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
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}
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LUA_API void *lua_touserdata (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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switch (ttype(o)) {
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case LUA_TUSERDATA: return (rawuvalue(o) + 1);
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case LUA_TLIGHTUSERDATA: return pvalue(o);
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default: return NULL;
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}
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}
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LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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return (!ttisthread(o)) ? NULL : thvalue(o);
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}
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LUA_API const void *lua_topointer (lua_State *L, int idx) {
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StkId o = index2adr(L, idx);
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switch (ttype(o)) {
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case LUA_TTABLE: return hvalue(o);
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case LUA_TFUNCTION: return clvalue(o);
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case LUA_TTHREAD: return thvalue(o);
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case LUA_TUSERDATA:
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case LUA_TLIGHTUSERDATA:
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return lua_touserdata(L, idx);
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default: return NULL;
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}
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}
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/*
|
|
417 |
** push functions (C -> stack)
|
|
418 |
*/
|
|
419 |
|
|
420 |
|
|
421 |
LUA_API void lua_pushnil (lua_State *L) {
|
|
422 |
lua_lock(L);
|
|
423 |
setnilvalue(L->top);
|
|
424 |
api_incr_top(L);
|
|
425 |
lua_unlock(L);
|
|
426 |
}
|
|
427 |
|
|
428 |
|
|
429 |
LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
|
|
430 |
lua_lock(L);
|
|
431 |
setnvalue(L->top, n);
|
|
432 |
api_incr_top(L);
|
|
433 |
lua_unlock(L);
|
|
434 |
}
|
|
435 |
|
|
436 |
|
|
437 |
LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
|
|
438 |
lua_lock(L);
|
|
439 |
setnvalue(L->top, cast_num(n));
|
|
440 |
api_incr_top(L);
|
|
441 |
lua_unlock(L);
|
|
442 |
}
|
|
443 |
|
|
444 |
|
|
445 |
LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
|
|
446 |
lua_lock(L);
|
|
447 |
luaC_checkGC(L);
|
|
448 |
setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
|
|
449 |
api_incr_top(L);
|
|
450 |
lua_unlock(L);
|
|
451 |
}
|
|
452 |
|
|
453 |
|
|
454 |
LUA_API void lua_pushstring (lua_State *L, const char *s) {
|
|
455 |
if (s == NULL)
|
|
456 |
lua_pushnil(L);
|
|
457 |
else
|
|
458 |
lua_pushlstring(L, s, strlen(s));
|
|
459 |
}
|
|
460 |
|
|
461 |
|
|
462 |
LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
|
|
463 |
va_list argp) {
|
|
464 |
const char *ret;
|
|
465 |
lua_lock(L);
|
|
466 |
luaC_checkGC(L);
|
|
467 |
ret = luaO_pushvfstring(L, fmt, argp);
|
|
468 |
lua_unlock(L);
|
|
469 |
return ret;
|
|
470 |
}
|
|
471 |
|
|
472 |
|
|
473 |
LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
|
|
474 |
const char *ret;
|
|
475 |
va_list argp;
|
|
476 |
lua_lock(L);
|
|
477 |
luaC_checkGC(L);
|
|
478 |
va_start(argp, fmt);
|
|
479 |
ret = luaO_pushvfstring(L, fmt, argp);
|
|
480 |
va_end(argp);
|
|
481 |
lua_unlock(L);
|
|
482 |
return ret;
|
|
483 |
}
|
|
484 |
|
|
485 |
|
|
486 |
LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
|
|
487 |
Closure *cl;
|
|
488 |
lua_lock(L);
|
|
489 |
luaC_checkGC(L);
|
|
490 |
api_checknelems(L, n);
|
|
491 |
cl = luaF_newCclosure(L, n, getcurrenv(L));
|
|
492 |
cl->c.f = fn;
|
|
493 |
L->top -= n;
|
|
494 |
while (n--)
|
|
495 |
setobj2n(L, &cl->c.upvalue[n], L->top+n);
|
|
496 |
setclvalue(L, L->top, cl);
|
|
497 |
lua_assert(iswhite(obj2gco(cl)));
|
|
498 |
api_incr_top(L);
|
|
499 |
lua_unlock(L);
|
|
500 |
}
|
|
501 |
|
|
502 |
|
|
503 |
LUA_API void lua_pushboolean (lua_State *L, int b) {
|
|
504 |
lua_lock(L);
|
|
505 |
setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
|
|
506 |
api_incr_top(L);
|
|
507 |
lua_unlock(L);
|
|
508 |
}
|
|
509 |
|
|
510 |
|
|
511 |
LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
|
|
512 |
lua_lock(L);
|
|
513 |
setpvalue(L->top, p);
|
|
514 |
api_incr_top(L);
|
|
515 |
lua_unlock(L);
|
|
516 |
}
|
|
517 |
|
|
518 |
|
|
519 |
LUA_API int lua_pushthread (lua_State *L) {
|
|
520 |
lua_lock(L);
|
|
521 |
setthvalue(L, L->top, L);
|
|
522 |
api_incr_top(L);
|
|
523 |
lua_unlock(L);
|
|
524 |
return (G(L)->mainthread == L);
|
|
525 |
}
|
|
526 |
|
|
527 |
|
|
528 |
|
|
529 |
/*
|
|
530 |
** get functions (Lua -> stack)
|
|
531 |
*/
|
|
532 |
|
|
533 |
|
|
534 |
LUA_API void lua_gettable (lua_State *L, int idx) {
|
|
535 |
StkId t;
|
|
536 |
lua_lock(L);
|
|
537 |
t = index2adr(L, idx);
|
|
538 |
api_checkvalidindex(L, t);
|
|
539 |
luaV_gettable(L, t, L->top - 1, L->top - 1);
|
|
540 |
lua_unlock(L);
|
|
541 |
}
|
|
542 |
|
|
543 |
|
|
544 |
LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
|
|
545 |
StkId t;
|
|
546 |
TValue key;
|
|
547 |
lua_lock(L);
|
|
548 |
t = index2adr(L, idx);
|
|
549 |
api_checkvalidindex(L, t);
|
|
550 |
setsvalue(L, &key, luaS_new(L, k));
|
|
551 |
luaV_gettable(L, t, &key, L->top);
|
|
552 |
api_incr_top(L);
|
|
553 |
lua_unlock(L);
|
|
554 |
}
|
|
555 |
|
|
556 |
|
|
557 |
LUA_API void lua_rawget (lua_State *L, int idx) {
|
|
558 |
StkId t;
|
|
559 |
lua_lock(L);
|
|
560 |
t = index2adr(L, idx);
|
|
561 |
api_check(L, ttistable(t));
|
|
562 |
setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
|
|
563 |
lua_unlock(L);
|
|
564 |
}
|
|
565 |
|
|
566 |
|
|
567 |
LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
|
|
568 |
StkId o;
|
|
569 |
lua_lock(L);
|
|
570 |
o = index2adr(L, idx);
|
|
571 |
api_check(L, ttistable(o));
|
|
572 |
setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
|
|
573 |
api_incr_top(L);
|
|
574 |
lua_unlock(L);
|
|
575 |
}
|
|
576 |
|
|
577 |
|
|
578 |
LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
|
|
579 |
lua_lock(L);
|
|
580 |
luaC_checkGC(L);
|
|
581 |
sethvalue(L, L->top, luaH_new(L, narray, nrec));
|
|
582 |
api_incr_top(L);
|
|
583 |
lua_unlock(L);
|
|
584 |
}
|
|
585 |
|
|
586 |
|
|
587 |
LUA_API int lua_getmetatable (lua_State *L, int objindex) {
|
|
588 |
const TValue *obj;
|
|
589 |
Table *mt = NULL;
|
|
590 |
int res;
|
|
591 |
lua_lock(L);
|
|
592 |
obj = index2adr(L, objindex);
|
|
593 |
switch (ttype(obj)) {
|
|
594 |
case LUA_TTABLE:
|
|
595 |
mt = hvalue(obj)->metatable;
|
|
596 |
break;
|
|
597 |
case LUA_TUSERDATA:
|
|
598 |
mt = uvalue(obj)->metatable;
|
|
599 |
break;
|
|
600 |
default:
|
|
601 |
mt = G(L)->mt[ttype(obj)];
|
|
602 |
break;
|
|
603 |
}
|
|
604 |
if (mt == NULL)
|
|
605 |
res = 0;
|
|
606 |
else {
|
|
607 |
sethvalue(L, L->top, mt);
|
|
608 |
api_incr_top(L);
|
|
609 |
res = 1;
|
|
610 |
}
|
|
611 |
lua_unlock(L);
|
|
612 |
return res;
|
|
613 |
}
|
|
614 |
|
|
615 |
|
|
616 |
LUA_API void lua_getfenv (lua_State *L, int idx) {
|
|
617 |
StkId o;
|
|
618 |
lua_lock(L);
|
|
619 |
o = index2adr(L, idx);
|
|
620 |
api_checkvalidindex(L, o);
|
|
621 |
switch (ttype(o)) {
|
|
622 |
case LUA_TFUNCTION:
|
|
623 |
sethvalue(L, L->top, clvalue(o)->c.env);
|
|
624 |
break;
|
|
625 |
case LUA_TUSERDATA:
|
|
626 |
sethvalue(L, L->top, uvalue(o)->env);
|
|
627 |
break;
|
|
628 |
case LUA_TTHREAD:
|
|
629 |
setobj2s(L, L->top, gt(thvalue(o)));
|
|
630 |
break;
|
|
631 |
default:
|
|
632 |
setnilvalue(L->top);
|
|
633 |
break;
|
|
634 |
}
|
|
635 |
api_incr_top(L);
|
|
636 |
lua_unlock(L);
|
|
637 |
}
|
|
638 |
|
|
639 |
|
|
640 |
/*
|
|
641 |
** set functions (stack -> Lua)
|
|
642 |
*/
|
|
643 |
|
|
644 |
|
|
645 |
LUA_API void lua_settable (lua_State *L, int idx) {
|
|
646 |
StkId t;
|
|
647 |
lua_lock(L);
|
|
648 |
api_checknelems(L, 2);
|
|
649 |
t = index2adr(L, idx);
|
|
650 |
api_checkvalidindex(L, t);
|
|
651 |
luaV_settable(L, t, L->top - 2, L->top - 1);
|
|
652 |
L->top -= 2; /* pop index and value */
|
|
653 |
lua_unlock(L);
|
|
654 |
}
|
|
655 |
|
|
656 |
|
|
657 |
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
|
|
658 |
StkId t;
|
|
659 |
TValue key;
|
|
660 |
lua_lock(L);
|
|
661 |
api_checknelems(L, 1);
|
|
662 |
t = index2adr(L, idx);
|
|
663 |
api_checkvalidindex(L, t);
|
|
664 |
setsvalue(L, &key, luaS_new(L, k));
|
|
665 |
luaV_settable(L, t, &key, L->top - 1);
|
|
666 |
L->top--; /* pop value */
|
|
667 |
lua_unlock(L);
|
|
668 |
}
|
|
669 |
|
|
670 |
|
|
671 |
LUA_API void lua_rawset (lua_State *L, int idx) {
|
|
672 |
StkId t;
|
|
673 |
lua_lock(L);
|
|
674 |
api_checknelems(L, 2);
|
|
675 |
t = index2adr(L, idx);
|
|
676 |
api_check(L, ttistable(t));
|
|
677 |
setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
|
|
678 |
luaC_barriert(L, hvalue(t), L->top-1);
|
|
679 |
L->top -= 2;
|
|
680 |
lua_unlock(L);
|
|
681 |
}
|
|
682 |
|
|
683 |
|
|
684 |
LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
|
|
685 |
StkId o;
|
|
686 |
lua_lock(L);
|
|
687 |
api_checknelems(L, 1);
|
|
688 |
o = index2adr(L, idx);
|
|
689 |
api_check(L, ttistable(o));
|
|
690 |
setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
|
|
691 |
luaC_barriert(L, hvalue(o), L->top-1);
|
|
692 |
L->top--;
|
|
693 |
lua_unlock(L);
|
|
694 |
}
|
|
695 |
|
|
696 |
|
|
697 |
LUA_API int lua_setmetatable (lua_State *L, int objindex) {
|
|
698 |
TValue *obj;
|
|
699 |
Table *mt;
|
|
700 |
lua_lock(L);
|
|
701 |
api_checknelems(L, 1);
|
|
702 |
obj = index2adr(L, objindex);
|
|
703 |
api_checkvalidindex(L, obj);
|
|
704 |
if (ttisnil(L->top - 1))
|
|
705 |
mt = NULL;
|
|
706 |
else {
|
|
707 |
api_check(L, ttistable(L->top - 1));
|
|
708 |
mt = hvalue(L->top - 1);
|
|
709 |
}
|
|
710 |
switch (ttype(obj)) {
|
|
711 |
case LUA_TTABLE: {
|
|
712 |
hvalue(obj)->metatable = mt;
|
|
713 |
if (mt)
|
|
714 |
luaC_objbarriert(L, hvalue(obj), mt);
|
|
715 |
break;
|
|
716 |
}
|
|
717 |
case LUA_TUSERDATA: {
|
|
718 |
uvalue(obj)->metatable = mt;
|
|
719 |
if (mt)
|
|
720 |
luaC_objbarrier(L, rawuvalue(obj), mt);
|
|
721 |
break;
|
|
722 |
}
|
|
723 |
default: {
|
|
724 |
G(L)->mt[ttype(obj)] = mt;
|
|
725 |
break;
|
|
726 |
}
|
|
727 |
}
|
|
728 |
L->top--;
|
|
729 |
lua_unlock(L);
|
|
730 |
return 1;
|
|
731 |
}
|
|
732 |
|
|
733 |
|
|
734 |
LUA_API int lua_setfenv (lua_State *L, int idx) {
|
|
735 |
StkId o;
|
|
736 |
int res = 1;
|
|
737 |
lua_lock(L);
|
|
738 |
api_checknelems(L, 1);
|
|
739 |
o = index2adr(L, idx);
|
|
740 |
api_checkvalidindex(L, o);
|
|
741 |
api_check(L, ttistable(L->top - 1));
|
|
742 |
switch (ttype(o)) {
|
|
743 |
case LUA_TFUNCTION:
|
|
744 |
clvalue(o)->c.env = hvalue(L->top - 1);
|
|
745 |
break;
|
|
746 |
case LUA_TUSERDATA:
|
|
747 |
uvalue(o)->env = hvalue(L->top - 1);
|
|
748 |
break;
|
|
749 |
case LUA_TTHREAD:
|
|
750 |
sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
|
|
751 |
break;
|
|
752 |
default:
|
|
753 |
res = 0;
|
|
754 |
break;
|
|
755 |
}
|
|
756 |
if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
|
|
757 |
L->top--;
|
|
758 |
lua_unlock(L);
|
|
759 |
return res;
|
|
760 |
}
|
|
761 |
|
|
762 |
|
|
763 |
/*
|
|
764 |
** `load' and `call' functions (run Lua code)
|
|
765 |
*/
|
|
766 |
|
|
767 |
|
|
768 |
#define adjustresults(L,nres) \
|
|
769 |
{ if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
|
|
770 |
|
|
771 |
|
|
772 |
#define checkresults(L,na,nr) \
|
|
773 |
api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
|
3697
|
774 |
|
2812
|
775 |
|
|
776 |
LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
|
|
777 |
StkId func;
|
|
778 |
lua_lock(L);
|
|
779 |
api_checknelems(L, nargs+1);
|
|
780 |
checkresults(L, nargs, nresults);
|
|
781 |
func = L->top - (nargs+1);
|
|
782 |
luaD_call(L, func, nresults);
|
|
783 |
adjustresults(L, nresults);
|
|
784 |
lua_unlock(L);
|
|
785 |
}
|
|
786 |
|
|
787 |
|
|
788 |
|
|
789 |
/*
|
|
790 |
** Execute a protected call.
|
|
791 |
*/
|
|
792 |
struct CallS { /* data to `f_call' */
|
|
793 |
StkId func;
|
|
794 |
int nresults;
|
|
795 |
};
|
|
796 |
|
|
797 |
|
|
798 |
static void f_call (lua_State *L, void *ud) {
|
|
799 |
struct CallS *c = cast(struct CallS *, ud);
|
|
800 |
luaD_call(L, c->func, c->nresults);
|
|
801 |
}
|
|
802 |
|
|
803 |
|
|
804 |
|
|
805 |
LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
|
|
806 |
struct CallS c;
|
|
807 |
int status;
|
|
808 |
ptrdiff_t func;
|
|
809 |
lua_lock(L);
|
|
810 |
api_checknelems(L, nargs+1);
|
|
811 |
checkresults(L, nargs, nresults);
|
|
812 |
if (errfunc == 0)
|
|
813 |
func = 0;
|
|
814 |
else {
|
|
815 |
StkId o = index2adr(L, errfunc);
|
|
816 |
api_checkvalidindex(L, o);
|
|
817 |
func = savestack(L, o);
|
|
818 |
}
|
|
819 |
c.func = L->top - (nargs+1); /* function to be called */
|
|
820 |
c.nresults = nresults;
|
|
821 |
status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
|
|
822 |
adjustresults(L, nresults);
|
|
823 |
lua_unlock(L);
|
|
824 |
return status;
|
|
825 |
}
|
|
826 |
|
|
827 |
|
|
828 |
/*
|
|
829 |
** Execute a protected C call.
|
|
830 |
*/
|
|
831 |
struct CCallS { /* data to `f_Ccall' */
|
|
832 |
lua_CFunction func;
|
|
833 |
void *ud;
|
|
834 |
};
|
|
835 |
|
|
836 |
|
|
837 |
static void f_Ccall (lua_State *L, void *ud) {
|
|
838 |
struct CCallS *c = cast(struct CCallS *, ud);
|
|
839 |
Closure *cl;
|
|
840 |
cl = luaF_newCclosure(L, 0, getcurrenv(L));
|
|
841 |
cl->c.f = c->func;
|
|
842 |
setclvalue(L, L->top, cl); /* push function */
|
|
843 |
api_incr_top(L);
|
|
844 |
setpvalue(L->top, c->ud); /* push only argument */
|
|
845 |
api_incr_top(L);
|
|
846 |
luaD_call(L, L->top - 2, 0);
|
|
847 |
}
|
|
848 |
|
|
849 |
|
|
850 |
LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
|
|
851 |
struct CCallS c;
|
|
852 |
int status;
|
|
853 |
lua_lock(L);
|
|
854 |
c.func = func;
|
|
855 |
c.ud = ud;
|
|
856 |
status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
|
|
857 |
lua_unlock(L);
|
|
858 |
return status;
|
|
859 |
}
|
|
860 |
|
|
861 |
|
|
862 |
LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
|
|
863 |
const char *chunkname) {
|
|
864 |
ZIO z;
|
|
865 |
int status;
|
|
866 |
lua_lock(L);
|
|
867 |
if (!chunkname) chunkname = "?";
|
|
868 |
luaZ_init(L, &z, reader, data);
|
|
869 |
status = luaD_protectedparser(L, &z, chunkname);
|
|
870 |
lua_unlock(L);
|
|
871 |
return status;
|
|
872 |
}
|
|
873 |
|
|
874 |
|
|
875 |
LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
|
|
876 |
int status;
|
|
877 |
TValue *o;
|
|
878 |
lua_lock(L);
|
|
879 |
api_checknelems(L, 1);
|
|
880 |
o = L->top - 1;
|
|
881 |
if (isLfunction(o))
|
|
882 |
status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
|
|
883 |
else
|
|
884 |
status = 1;
|
|
885 |
lua_unlock(L);
|
|
886 |
return status;
|
|
887 |
}
|
|
888 |
|
|
889 |
|
|
890 |
LUA_API int lua_status (lua_State *L) {
|
|
891 |
return L->status;
|
|
892 |
}
|
|
893 |
|
|
894 |
|
|
895 |
/*
|
|
896 |
** Garbage-collection function
|
|
897 |
*/
|
|
898 |
|
|
899 |
LUA_API int lua_gc (lua_State *L, int what, int data) {
|
|
900 |
int res = 0;
|
|
901 |
global_State *g;
|
|
902 |
lua_lock(L);
|
|
903 |
g = G(L);
|
|
904 |
switch (what) {
|
|
905 |
case LUA_GCSTOP: {
|
|
906 |
g->GCthreshold = MAX_LUMEM;
|
|
907 |
break;
|
|
908 |
}
|
|
909 |
case LUA_GCRESTART: {
|
|
910 |
g->GCthreshold = g->totalbytes;
|
|
911 |
break;
|
|
912 |
}
|
|
913 |
case LUA_GCCOLLECT: {
|
|
914 |
luaC_fullgc(L);
|
|
915 |
break;
|
|
916 |
}
|
|
917 |
case LUA_GCCOUNT: {
|
|
918 |
/* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
919 |
res = cast_int(g->totalbytes >> 10);
|
|
920 |
break;
|
|
921 |
}
|
|
922 |
case LUA_GCCOUNTB: {
|
|
923 |
res = cast_int(g->totalbytes & 0x3ff);
|
|
924 |
break;
|
|
925 |
}
|
|
926 |
case LUA_GCSTEP: {
|
|
927 |
lu_mem a = (cast(lu_mem, data) << 10);
|
|
928 |
if (a <= g->totalbytes)
|
|
929 |
g->GCthreshold = g->totalbytes - a;
|
|
930 |
else
|
|
931 |
g->GCthreshold = 0;
|
|
932 |
while (g->GCthreshold <= g->totalbytes) {
|
|
933 |
luaC_step(L);
|
|
934 |
if (g->gcstate == GCSpause) { /* end of cycle? */
|
|
935 |
res = 1; /* signal it */
|
|
936 |
break;
|
|
937 |
}
|
|
938 |
}
|
|
939 |
break;
|
|
940 |
}
|
|
941 |
case LUA_GCSETPAUSE: {
|
|
942 |
res = g->gcpause;
|
|
943 |
g->gcpause = data;
|
|
944 |
break;
|
|
945 |
}
|
|
946 |
case LUA_GCSETSTEPMUL: {
|
|
947 |
res = g->gcstepmul;
|
|
948 |
g->gcstepmul = data;
|
|
949 |
break;
|
|
950 |
}
|
|
951 |
default: res = -1; /* invalid option */
|
|
952 |
}
|
|
953 |
lua_unlock(L);
|
|
954 |
return res;
|
|
955 |
}
|
|
956 |
|
|
957 |
|
|
958 |
|
|
959 |
/*
|
|
960 |
** miscellaneous functions
|
|
961 |
*/
|
|
962 |
|
|
963 |
|
|
964 |
LUA_API int lua_error (lua_State *L) {
|
|
965 |
lua_lock(L);
|
|
966 |
api_checknelems(L, 1);
|
|
967 |
luaG_errormsg(L);
|
|
968 |
lua_unlock(L);
|
|
969 |
return 0; /* to avoid warnings */
|
|
970 |
}
|
|
971 |
|
|
972 |
|
|
973 |
LUA_API int lua_next (lua_State *L, int idx) {
|
|
974 |
StkId t;
|
|
975 |
int more;
|
|
976 |
lua_lock(L);
|
|
977 |
t = index2adr(L, idx);
|
|
978 |
api_check(L, ttistable(t));
|
|
979 |
more = luaH_next(L, hvalue(t), L->top - 1);
|
|
980 |
if (more) {
|
|
981 |
api_incr_top(L);
|
|
982 |
}
|
|
983 |
else /* no more elements */
|
|
984 |
L->top -= 1; /* remove key */
|
|
985 |
lua_unlock(L);
|
|
986 |
return more;
|
|
987 |
}
|
|
988 |
|
|
989 |
|
|
990 |
LUA_API void lua_concat (lua_State *L, int n) {
|
|
991 |
lua_lock(L);
|
|
992 |
api_checknelems(L, n);
|
|
993 |
if (n >= 2) {
|
|
994 |
luaC_checkGC(L);
|
|
995 |
luaV_concat(L, n, cast_int(L->top - L->base) - 1);
|
|
996 |
L->top -= (n-1);
|
|
997 |
}
|
|
998 |
else if (n == 0) { /* push empty string */
|
|
999 |
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
|
|
1000 |
api_incr_top(L);
|
|
1001 |
}
|
|
1002 |
/* else n == 1; nothing to do */
|
|
1003 |
lua_unlock(L);
|
|
1004 |
}
|
|
1005 |
|
|
1006 |
|
|
1007 |
LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
|
|
1008 |
lua_Alloc f;
|
|
1009 |
lua_lock(L);
|
|
1010 |
if (ud) *ud = G(L)->ud;
|
|
1011 |
f = G(L)->frealloc;
|
|
1012 |
lua_unlock(L);
|
|
1013 |
return f;
|
|
1014 |
}
|
|
1015 |
|
|
1016 |
|
|
1017 |
LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
|
|
1018 |
lua_lock(L);
|
|
1019 |
G(L)->ud = ud;
|
|
1020 |
G(L)->frealloc = f;
|
|
1021 |
lua_unlock(L);
|
|
1022 |
}
|
|
1023 |
|
|
1024 |
|
|
1025 |
LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
|
|
1026 |
Udata *u;
|
|
1027 |
lua_lock(L);
|
|
1028 |
luaC_checkGC(L);
|
|
1029 |
u = luaS_newudata(L, size, getcurrenv(L));
|
|
1030 |
setuvalue(L, L->top, u);
|
|
1031 |
api_incr_top(L);
|
|
1032 |
lua_unlock(L);
|
|
1033 |
return u + 1;
|
|
1034 |
}
|
|
1035 |
|
|
1036 |
|
|
1037 |
|
|
1038 |
|
|
1039 |
static const char *aux_upvalue (StkId fi, int n, TValue **val) {
|
|
1040 |
Closure *f;
|
|
1041 |
if (!ttisfunction(fi)) return NULL;
|
|
1042 |
f = clvalue(fi);
|
|
1043 |
if (f->c.isC) {
|
|
1044 |
if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
|
|
1045 |
*val = &f->c.upvalue[n-1];
|
|
1046 |
return "";
|
|
1047 |
}
|
|
1048 |
else {
|
|
1049 |
Proto *p = f->l.p;
|
|
1050 |
if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
|
|
1051 |
*val = f->l.upvals[n-1]->v;
|
|
1052 |
return getstr(p->upvalues[n-1]);
|
|
1053 |
}
|
|
1054 |
}
|
|
1055 |
|
|
1056 |
|
|
1057 |
LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
|
|
1058 |
const char *name;
|
|
1059 |
TValue *val;
|
|
1060 |
lua_lock(L);
|
|
1061 |
name = aux_upvalue(index2adr(L, funcindex), n, &val);
|
|
1062 |
if (name) {
|
|
1063 |
setobj2s(L, L->top, val);
|
|
1064 |
api_incr_top(L);
|
|
1065 |
}
|
|
1066 |
lua_unlock(L);
|
|
1067 |
return name;
|
|
1068 |
}
|
|
1069 |
|
|
1070 |
|
|
1071 |
LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
|
|
1072 |
const char *name;
|
|
1073 |
TValue *val;
|
|
1074 |
StkId fi;
|
|
1075 |
lua_lock(L);
|
|
1076 |
fi = index2adr(L, funcindex);
|
|
1077 |
api_checknelems(L, 1);
|
|
1078 |
name = aux_upvalue(fi, n, &val);
|
|
1079 |
if (name) {
|
|
1080 |
L->top--;
|
|
1081 |
setobj(L, val, L->top);
|
|
1082 |
luaC_barrier(L, clvalue(fi), L->top);
|
|
1083 |
}
|
|
1084 |
lua_unlock(L);
|
|
1085 |
return name;
|
|
1086 |
}
|
|
1087 |
|