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Add lua_setuserdatatag to update userdata tags (#588)

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Alex Orlenko 2022-07-14 20:00:37 +01:00 committed by GitHub
parent a934f742d8
commit e87009f5b2
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3 changed files with 15 additions and 2 deletions
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5
VM/include/lua.h
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@ -64,14 +64,14 @@ enum lua_Type
LUA_TNIL = 0, /* must be 0 due to lua_isnoneornil */
LUA_TBOOLEAN = 1, /* must be 1 due to l_isfalse */
LUA_TLIGHTUSERDATA,
LUA_TNUMBER,
LUA_TVECTOR,
LUA_TSTRING, /* all types above this must be value types, all types below this must be GC types - see iscollectable */
LUA_TTABLE,
LUA_TFUNCTION,
LUA_TUSERDATA,
@ -300,6 +300,7 @@ LUA_API uintptr_t lua_encodepointer(lua_State* L, uintptr_t p);
LUA_API double lua_clock();
LUA_API void lua_setuserdatatag(lua_State* L, int idx, int tag);
LUA_API void lua_setuserdatadtor(lua_State* L, int tag, void (*dtor)(lua_State*, void*));
LUA_API void lua_clonefunction(lua_State* L, int idx);

8
VM/src/lapi.cpp
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@ -1305,6 +1305,14 @@ void lua_unref(lua_State* L, int ref)
return;
}
void lua_setuserdatatag(lua_State* L, int idx, int tag)
{
api_check(L, unsigned(tag) < LUA_UTAG_LIMIT);
StkId o = index2addr(L, idx);
api_check(L, ttisuserdata(o));
uvalue(o)->tag = uint8_t(tag);
}
void lua_setuserdatadtor(lua_State* L, int tag, void (*dtor)(lua_State*, void*))
{
api_check(L, unsigned(tag) < LUA_UTAG_LIMIT);

4
tests/Conformance.test.cpp
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@ -1152,6 +1152,10 @@ TEST_CASE("UserdataApi")
CHECK(lua_touserdatatagged(L, -1, 41) == nullptr);
CHECK(lua_userdatatag(L, -1) == 42);
lua_setuserdatatag(L, -1, 43);
CHECK(lua_userdatatag(L, -1) == 43);
lua_setuserdatatag(L, -1, 42);
// user data with inline dtor
void* ud3 = lua_newuserdatadtor(L, 4, [](void* data) {
dtorhits += *(int*)data;