45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
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#include "ludata.h"
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#include "lgc.h"
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#include "lmem.h"
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#include <string.h>
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Udata* luaU_newudata(lua_State* L, size_t s, int tag)
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{
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if (s > INT_MAX - sizeof(Udata))
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luaM_toobig(L);
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Udata* u = luaM_newgco(L, Udata, sizeudata(s), L->activememcat);
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luaC_init(L, u, LUA_TUSERDATA);
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u->len = int(s);
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u->metatable = NULL;
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LUAU_ASSERT(tag >= 0 && tag <= 255);
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u->tag = uint8_t(tag);
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return u;
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}
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void luaU_freeudata(lua_State* L, Udata* u, lua_Page* page)
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{
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if (u->tag < LUA_UTAG_LIMIT)
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{
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void (*dtor)(lua_State*, void*) = nullptr;
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dtor = L->global->udatagc[u->tag];
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// TODO: access to L here is highly unsafe since this is called during internal GC traversal
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// certain operations such as lua_getthreaddata are okay, but by and large this risks crashes on improper use
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if (dtor)
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dtor(L, u->data);
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}
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else if (u->tag == UTAG_IDTOR)
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{
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void (*dtor)(void*) = nullptr;
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memcpy(&dtor, &u->data + u->len - sizeof(dtor), sizeof(dtor));
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if (dtor)
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dtor(u->data);
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}
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luaM_freegco(L, u, sizeudata(u->len), u->memcat, page);
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}
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