45bd14b392
Derivative of work by RobertGabrielJakabosky http://lua-users.org/wiki/EmergencyGarbageCollector I've only implemented the not enough memory part and expanded this idea to adding a mechanism to signal the OOM condition of the plugin buffer which allows us to only grab the playback buffer after garbage collection fails (SO THE MUSIC KEEPS PLAYING AS LONG AS POSSIBLE) Change-Id: I684fb98b540ffc01f7ba324ab5b761ceb59b9f9b
1097 lines
22 KiB
C
1097 lines
22 KiB
C
/*
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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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#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
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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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/*
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** push functions (C -> stack)
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*/
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LUA_API void lua_pushnil (lua_State *L) {
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lua_lock(L);
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setnilvalue(L->top);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
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lua_lock(L);
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setnvalue(L->top, n);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
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lua_lock(L);
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setnvalue(L->top, cast_num(n));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
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lua_lock(L);
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luaC_checkGC(L);
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setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushstring (lua_State *L, const char *s) {
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if (s == NULL)
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lua_pushnil(L);
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else
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lua_pushlstring(L, s, strlen(s));
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}
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LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
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va_list argp) {
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const char *ret;
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lua_lock(L);
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luaC_checkGC(L);
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ret = luaO_pushvfstring(L, fmt, argp);
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lua_unlock(L);
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return ret;
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}
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LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
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const char *ret;
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va_list argp;
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lua_lock(L);
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luaC_checkGC(L);
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va_start(argp, fmt);
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ret = luaO_pushvfstring(L, fmt, argp);
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va_end(argp);
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lua_unlock(L);
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return ret;
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}
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LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
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Closure *cl;
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lua_lock(L);
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luaC_checkGC(L);
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api_checknelems(L, n);
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cl = luaF_newCclosure(L, n, getcurrenv(L));
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cl->c.f = fn;
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L->top -= n;
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while (n--)
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setobj2n(L, &cl->c.upvalue[n], L->top+n);
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setclvalue(L, L->top, cl);
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lua_assert(iswhite(obj2gco(cl)));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushboolean (lua_State *L, int b) {
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lua_lock(L);
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setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
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lua_lock(L);
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setpvalue(L->top, p);
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api_incr_top(L);
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lua_unlock(L);
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}
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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_gettable (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2adr(L, idx);
|
|
api_checkvalidindex(L, t);
|
|
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;
|
|
TValue key;
|
|
lua_lock(L);
|
|
t = index2adr(L, idx);
|
|
api_checkvalidindex(L, t);
|
|
fixedstack(L);
|
|
setsvalue(L, &key, luaS_new(L, k));
|
|
unfixedstack(L);
|
|
luaV_gettable(L, t, &key, L->top);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawget (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
t = index2adr(L, idx);
|
|
api_check(L, ttistable(t));
|
|
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 o;
|
|
lua_lock(L);
|
|
o = index2adr(L, idx);
|
|
api_check(L, ttistable(o));
|
|
setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
|
|
lua_lock(L);
|
|
luaC_checkGC(L);
|
|
sethvalue(L, L->top, luaH_new(L, narray, nrec));
|
|
api_incr_top(L);
|
|
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 = index2adr(L, objindex);
|
|
switch (ttype(obj)) {
|
|
case LUA_TTABLE:
|
|
mt = hvalue(obj)->metatable;
|
|
break;
|
|
case LUA_TUSERDATA:
|
|
mt = uvalue(obj)->metatable;
|
|
break;
|
|
default:
|
|
mt = G(L)->mt[ttype(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_getfenv (lua_State *L, int idx) {
|
|
StkId o;
|
|
lua_lock(L);
|
|
o = index2adr(L, idx);
|
|
api_checkvalidindex(L, o);
|
|
switch (ttype(o)) {
|
|
case LUA_TFUNCTION:
|
|
sethvalue(L, L->top, clvalue(o)->c.env);
|
|
break;
|
|
case LUA_TUSERDATA:
|
|
sethvalue(L, L->top, uvalue(o)->env);
|
|
break;
|
|
case LUA_TTHREAD:
|
|
setobj2s(L, L->top, gt(thvalue(o)));
|
|
break;
|
|
default:
|
|
setnilvalue(L->top);
|
|
break;
|
|
}
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** set functions (stack -> Lua)
|
|
*/
|
|
|
|
|
|
LUA_API void lua_settable (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
api_checknelems(L, 2);
|
|
t = index2adr(L, idx);
|
|
api_checkvalidindex(L, t);
|
|
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 = index2adr(L, idx);
|
|
api_checkvalidindex(L, t);
|
|
setsvalue2s(L, L->top, luaS_new(L, k));
|
|
api_incr_top(L);
|
|
luaV_settable(L, t, L->top - 1, L->top - 2);
|
|
L->top -= 2; /* pop key and value */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawset (lua_State *L, int idx) {
|
|
StkId t;
|
|
lua_lock(L);
|
|
api_checknelems(L, 2);
|
|
t = index2adr(L, idx);
|
|
api_check(L, ttistable(t));
|
|
fixedstack(L);
|
|
setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
|
|
unfixedstack(L);
|
|
luaC_barriert(L, hvalue(t), L->top-1);
|
|
L->top -= 2;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
|
|
StkId o;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = index2adr(L, idx);
|
|
api_check(L, ttistable(o));
|
|
fixedstack(L);
|
|
setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
|
|
unfixedstack(L);
|
|
luaC_barriert(L, hvalue(o), 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 = index2adr(L, objindex);
|
|
api_checkvalidindex(L, obj);
|
|
if (ttisnil(L->top - 1))
|
|
mt = NULL;
|
|
else {
|
|
api_check(L, ttistable(L->top - 1));
|
|
mt = hvalue(L->top - 1);
|
|
}
|
|
switch (ttype(obj)) {
|
|
case LUA_TTABLE: {
|
|
hvalue(obj)->metatable = mt;
|
|
if (mt)
|
|
luaC_objbarriert(L, hvalue(obj), mt);
|
|
break;
|
|
}
|
|
case LUA_TUSERDATA: {
|
|
uvalue(obj)->metatable = mt;
|
|
if (mt)
|
|
luaC_objbarrier(L, rawuvalue(obj), mt);
|
|
break;
|
|
}
|
|
default: {
|
|
G(L)->mt[ttype(obj)] = mt;
|
|
break;
|
|
}
|
|
}
|
|
L->top--;
|
|
lua_unlock(L);
|
|
return 1;
|
|
}
|
|
|
|
|
|
LUA_API int lua_setfenv (lua_State *L, int idx) {
|
|
StkId o;
|
|
int res = 1;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = index2adr(L, idx);
|
|
api_checkvalidindex(L, o);
|
|
api_check(L, ttistable(L->top - 1));
|
|
switch (ttype(o)) {
|
|
case LUA_TFUNCTION:
|
|
clvalue(o)->c.env = hvalue(L->top - 1);
|
|
break;
|
|
case LUA_TUSERDATA:
|
|
uvalue(o)->env = hvalue(L->top - 1);
|
|
break;
|
|
case LUA_TTHREAD:
|
|
sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
|
|
break;
|
|
default:
|
|
res = 0;
|
|
break;
|
|
}
|
|
if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
|
|
L->top--;
|
|
lua_unlock(L);
|
|
return res;
|
|
}
|
|
|
|
|
|
/*
|
|
** `load' and `call' functions (run Lua code)
|
|
*/
|
|
|
|
|
|
#define adjustresults(L,nres) \
|
|
{ if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
|
|
|
|
|
|
#define checkresults(L,na,nr) \
|
|
api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
|
|
|
|
|
|
LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
|
|
StkId func;
|
|
lua_lock(L);
|
|
api_checknelems(L, nargs+1);
|
|
checkresults(L, nargs, nresults);
|
|
func = L->top - (nargs+1);
|
|
luaD_call(L, func, nresults);
|
|
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);
|
|
}
|
|
|
|
|
|
|
|
LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
|
|
struct CallS c;
|
|
int status;
|
|
ptrdiff_t func;
|
|
lua_lock(L);
|
|
api_checknelems(L, nargs+1);
|
|
checkresults(L, nargs, nresults);
|
|
if (errfunc == 0)
|
|
func = 0;
|
|
else {
|
|
StkId o = index2adr(L, errfunc);
|
|
api_checkvalidindex(L, o);
|
|
func = savestack(L, o);
|
|
}
|
|
c.func = L->top - (nargs+1); /* function to be called */
|
|
c.nresults = nresults;
|
|
status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
|
|
adjustresults(L, nresults);
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
** Execute a protected C call.
|
|
*/
|
|
struct CCallS { /* data to `f_Ccall' */
|
|
lua_CFunction func;
|
|
void *ud;
|
|
};
|
|
|
|
|
|
static void f_Ccall (lua_State *L, void *ud) {
|
|
struct CCallS *c = cast(struct CCallS *, ud);
|
|
Closure *cl;
|
|
cl = luaF_newCclosure(L, 0, getcurrenv(L));
|
|
cl->c.f = c->func;
|
|
setclvalue(L, L->top, cl); /* push function */
|
|
api_incr_top(L);
|
|
setpvalue(L->top, c->ud); /* push only argument */
|
|
api_incr_top(L);
|
|
luaD_call(L, L->top - 2, 0);
|
|
}
|
|
|
|
|
|
LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
|
|
struct CCallS c;
|
|
int status;
|
|
lua_lock(L);
|
|
c.func = func;
|
|
c.ud = ud;
|
|
status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
|
|
const char *chunkname) {
|
|
ZIO z;
|
|
int status;
|
|
lua_lock(L);
|
|
if (!chunkname) chunkname = "?";
|
|
luaZ_init(L, &z, reader, data);
|
|
status = luaD_protectedparser(L, &z, chunkname);
|
|
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, clvalue(o)->l.p, 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: {
|
|
set_block_gc(L);
|
|
break;
|
|
}
|
|
case LUA_GCRESTART: {
|
|
unset_block_gc(L);
|
|
break;
|
|
}
|
|
case LUA_GCCOLLECT: {
|
|
luaC_fullgc(L);
|
|
break;
|
|
}
|
|
case LUA_GCCOUNT: {
|
|
/* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
res = cast_int(g->totalbytes >> 10);
|
|
break;
|
|
}
|
|
case LUA_GCCOUNTB: {
|
|
res = cast_int(g->totalbytes & 0x3ff);
|
|
break;
|
|
}
|
|
case LUA_GCSTEP: {
|
|
if(is_block_gc(L)) {
|
|
res = 1; /* gc is block so we need to pretend that the collection cycle finished. */
|
|
break;
|
|
}
|
|
lu_mem a = (cast(lu_mem, data) << 10);
|
|
if (a <= g->totalbytes)
|
|
g->GCthreshold = g->totalbytes - a;
|
|
else
|
|
g->GCthreshold = 0;
|
|
while (g->GCthreshold <= g->totalbytes) {
|
|
luaC_step(L);
|
|
if (g->gcstate == GCSpause) { /* end of cycle? */
|
|
res = 1; /* signal it */
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case LUA_GCSETPAUSE: {
|
|
res = g->gcpause;
|
|
g->gcpause = data;
|
|
break;
|
|
}
|
|
case LUA_GCSETSTEPMUL: {
|
|
res = g->gcstepmul;
|
|
g->gcstepmul = data;
|
|
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);
|
|
lua_unlock(L);
|
|
return 0; /* to avoid warnings */
|
|
}
|
|
|
|
|
|
LUA_API int lua_next (lua_State *L, int idx) {
|
|
StkId t;
|
|
int more;
|
|
lua_lock(L);
|
|
t = index2adr(L, idx);
|
|
api_check(L, ttistable(t));
|
|
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, cast_int(L->top - L->base) - 1);
|
|
L->top -= (n-1);
|
|
}
|
|
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 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, getcurrenv(L));
|
|
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) {
|
|
Closure *f;
|
|
if (!ttisfunction(fi)) return NULL;
|
|
f = clvalue(fi);
|
|
if (f->c.isC) {
|
|
if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
|
|
*val = &f->c.upvalue[n-1];
|
|
return "";
|
|
}
|
|
else {
|
|
Proto *p = f->l.p;
|
|
if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
|
|
*val = f->l.upvals[n-1]->v;
|
|
return getstr(p->upvalues[n-1]);
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
|
|
const char *name;
|
|
TValue *val;
|
|
lua_lock(L);
|
|
name = aux_upvalue(index2adr(L, funcindex), n, &val);
|
|
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;
|
|
StkId fi;
|
|
lua_lock(L);
|
|
fi = index2adr(L, funcindex);
|
|
api_checknelems(L, 1);
|
|
name = aux_upvalue(fi, n, &val);
|
|
if (name) {
|
|
L->top--;
|
|
setobj(L, val, L->top);
|
|
luaC_barrier(L, clvalue(fi), L->top);
|
|
}
|
|
lua_unlock(L);
|
|
return name;
|
|
}
|
|
|