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-rw-r--r--src/Bindings/LuaState.cpp149
1 files changed, 145 insertions, 4 deletions
diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp
index f11e74e75..ffe1fe4ac 100644
--- a/src/Bindings/LuaState.cpp
+++ b/src/Bindings/LuaState.cpp
@@ -20,6 +20,10 @@ extern "C"
#include "../Entities/Entity.h"
#include "../BlockEntities/BlockEntity.h"
+
+
+
+
// fwd: "SQLite/lsqlite3.c"
extern "C"
{
@@ -39,6 +43,10 @@ extern "C"
const cLuaState::cRet cLuaState::Return = {};
+/** Each Lua state stores a pointer to its creating cLuaState in Lua globals, under this name.
+This way any cLuaState can reference the main cLuaState's TrackedCallbacks, mutex etc. */
+static const char * g_CanonLuaStateGlobalName = "_CuberiteInternal_CanonLuaState";
+
@@ -114,6 +122,72 @@ cLuaStateTracker & cLuaStateTracker::Get(void)
////////////////////////////////////////////////////////////////////////////////
+// cLuaState::cCallback:
+
+bool cLuaState::cCallback::RefStack(cLuaState & a_LuaState, int a_StackPos)
+{
+ // Check if the stack contains a function:
+ if (!lua_isfunction(a_LuaState, a_StackPos))
+ {
+ return false;
+ }
+
+ // Clear any previous callback:
+ Clear();
+
+ // Add self to LuaState's callback-tracking:
+ a_LuaState.TrackCallback(*this);
+
+ // Store the new callback:
+ cCSLock Lock(m_CS);
+ m_Ref.RefStack(a_LuaState, a_StackPos);
+ return true;
+}
+
+
+
+
+
+void cLuaState::cCallback::Clear(void)
+{
+ // Free the callback reference:
+ lua_State * luaState = nullptr;
+ {
+ cCSLock Lock(m_CS);
+ if (!m_Ref.IsValid())
+ {
+ return;
+ }
+ luaState = m_Ref.GetLuaState();
+ m_Ref.UnRef();
+ }
+
+ // Remove from LuaState's callback-tracking:
+ cLuaState(luaState).UntrackCallback(*this);
+}
+
+
+
+
+
+void cLuaState::cCallback::Invalidate(void)
+{
+ cCSLock Lock(m_CS);
+ if (!m_Ref.IsValid())
+ {
+ LOGD("%s: Invalidating an already invalid callback at %p, this should not happen",
+ __FUNCTION__, reinterpret_cast<void *>(this)
+ );
+ return;
+ }
+ m_Ref.UnRef();
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
// cLuaState:
cLuaState::cLuaState(const AString & a_SubsystemName) :
@@ -170,6 +244,10 @@ void cLuaState::Create(void)
luaL_openlibs(m_LuaState);
m_IsOwned = true;
cLuaStateTracker::Add(*this);
+
+ // Add the CanonLuaState value into the Lua state, so that we can get it from anywhere:
+ lua_pushlightuserdata(m_LuaState, reinterpret_cast<void *>(this));
+ lua_setglobal(m_LuaState, g_CanonLuaStateGlobalName);
}
@@ -206,6 +284,16 @@ void cLuaState::Close(void)
Detach();
return;
}
+
+ // Invalidate all callbacks:
+ {
+ cCSLock Lock(m_CSTrackedCallbacks);
+ for (auto & c: m_TrackedCallbacks)
+ {
+ c->Invalidate();
+ }
+ }
+
cLuaStateTracker::Del(*this);
lua_close(m_LuaState);
m_LuaState = nullptr;
@@ -871,6 +959,15 @@ bool cLuaState::GetStackValue(int a_StackPos, cRef & a_Ref)
+bool cLuaState::GetStackValue(int a_StackPos, cCallback & a_Callback)
+{
+ return a_Callback.RefStack(*this, a_StackPos);
+}
+
+
+
+
+
bool cLuaState::GetStackValue(int a_StackPos, double & a_ReturnedVal)
{
if (lua_isnumber(m_LuaState, a_StackPos))
@@ -1701,6 +1798,52 @@ int cLuaState::BreakIntoDebugger(lua_State * a_LuaState)
+void cLuaState::TrackCallback(cCallback & a_Callback)
+{
+ // Get the CanonLuaState global from Lua:
+ auto cb = WalkToNamedGlobal(g_CanonLuaStateGlobalName);
+ if (!cb.IsValid())
+ {
+ LOGWARNING("%s: Lua state %p has invalid CanonLuaState!", __FUNCTION__, reinterpret_cast<void *>(m_LuaState));
+ return;
+ }
+ auto & canonState = *reinterpret_cast<cLuaState *>(lua_touserdata(m_LuaState, -1));
+
+ // Add the callback:
+ cCSLock Lock(canonState.m_CSTrackedCallbacks);
+ canonState.m_TrackedCallbacks.push_back(&a_Callback);
+}
+
+
+
+
+
+void cLuaState::UntrackCallback(cCallback & a_Callback)
+{
+ // Get the CanonLuaState global from Lua:
+ auto cb = WalkToNamedGlobal(g_CanonLuaStateGlobalName);
+ if (!cb.IsValid())
+ {
+ LOGWARNING("%s: Lua state %p has invalid CanonLuaState!", __FUNCTION__, reinterpret_cast<void *>(m_LuaState));
+ return;
+ }
+ auto & canonState = *reinterpret_cast<cLuaState *>(lua_touserdata(m_LuaState, -1));
+
+ // Remove the callback:
+ cCSLock Lock(canonState.m_CSTrackedCallbacks);
+ auto & trackedCallbacks = canonState.m_TrackedCallbacks;
+ trackedCallbacks.erase(std::remove_if(trackedCallbacks.begin(), trackedCallbacks.end(),
+ [&a_Callback](cCallback * a_StoredCallback)
+ {
+ return (a_StoredCallback == &a_Callback);
+ }
+ ));
+}
+
+
+
+
+
////////////////////////////////////////////////////////////////////////////////
// cLuaState::cRef:
@@ -1756,7 +1899,7 @@ void cLuaState::cRef::RefStack(cLuaState & a_LuaState, int a_StackPos)
{
UnRef();
}
- m_LuaState = &a_LuaState;
+ m_LuaState = a_LuaState;
lua_pushvalue(a_LuaState, a_StackPos); // Push a copy of the value at a_StackPos onto the stack
m_Ref = luaL_ref(a_LuaState, LUA_REGISTRYINDEX);
}
@@ -1767,11 +1910,9 @@ void cLuaState::cRef::RefStack(cLuaState & a_LuaState, int a_StackPos)
void cLuaState::cRef::UnRef(void)
{
- ASSERT(m_LuaState->IsValid()); // The reference should be destroyed before destroying the LuaState
-
if (IsValid())
{
- luaL_unref(*m_LuaState, LUA_REGISTRYINDEX, m_Ref);
+ luaL_unref(m_LuaState, LUA_REGISTRYINDEX, m_Ref);
}
m_LuaState = nullptr;
m_Ref = LUA_REFNIL;