diff options
Diffstat (limited to 'src/Bindings/LuaState.cpp')
| -rw-r--r-- | src/Bindings/LuaState.cpp | 205 |
1 files changed, 188 insertions, 17 deletions
diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp index bfee1d037..d49cd8ef3 100644 --- a/src/Bindings/LuaState.cpp +++ b/src/Bindings/LuaState.cpp @@ -235,7 +235,7 @@ bool cLuaState::PushFunction(const char * a_FunctionName) if (!lua_isfunction(m_LuaState, -1)) { LOGWARNING("Error in %s: Could not find function %s()", m_SubsystemName.c_str(), a_FunctionName); - lua_pop(m_LuaState, 1); + lua_pop(m_LuaState, 2); return false; } m_CurrentFunctionName.assign(a_FunctionName); @@ -258,7 +258,7 @@ bool cLuaState::PushFunction(int a_FnRef) lua_rawgeti(m_LuaState, LUA_REGISTRYINDEX, a_FnRef); // same as lua_getref() if (!lua_isfunction(m_LuaState, -1)) { - lua_pop(m_LuaState, 1); + lua_pop(m_LuaState, 2); return false; } m_CurrentFunctionName = "<callback>"; @@ -282,16 +282,20 @@ bool cLuaState::PushFunction(const cTableRef & a_TableRef) if (!lua_istable(m_LuaState, -1)) { // Not a table, bail out - lua_pop(m_LuaState, 1); + lua_pop(m_LuaState, 2); return false; } lua_getfield(m_LuaState, -1, a_TableRef.GetFnName()); if (lua_isnil(m_LuaState, -1) || !lua_isfunction(m_LuaState, -1)) { // Not a valid function, bail out - lua_pop(m_LuaState, 2); + lua_pop(m_LuaState, 3); return false; } + + // Pop the table off the stack: + lua_remove(m_LuaState, -2); + Printf(m_CurrentFunctionName, "<table-callback %s>", a_TableRef.GetFnName()); m_NumCurrentFunctionArgs = 0; return true; @@ -742,6 +746,10 @@ bool cLuaState::CallFunction(int a_NumResults) } m_NumCurrentFunctionArgs = -1; m_CurrentFunctionName.clear(); + + // Remove the error handler from the stack: + lua_remove(m_LuaState, -a_NumResults - 1); + return true; } @@ -1025,21 +1033,184 @@ void cLuaState::LogStackTrace(lua_State * a_LuaState) AString cLuaState::GetTypeText(int a_StackPos) { - int Type = lua_type(m_LuaState, a_StackPos); - switch (Type) + return lua_typename(m_LuaState, lua_type(m_LuaState, a_StackPos)); +} + + + + + +int cLuaState::CallFunctionWithForeignParams( + const AString & a_FunctionName, + cLuaState & a_SrcLuaState, + int a_SrcParamStart, + int a_SrcParamEnd +) +{ + ASSERT(IsValid()); + ASSERT(a_SrcLuaState.IsValid()); + + // Store the stack position before any changes + int OldTop = lua_gettop(m_LuaState); + + // Push the function to call, including the error handler: + if (!PushFunction(a_FunctionName.c_str())) + { + LOGWARNING("Function '%s' not found", a_FunctionName.c_str()); + lua_pop(m_LuaState, 2); + return -1; + } + + // Copy the function parameters to the target state + if (CopyStackFrom(a_SrcLuaState, a_SrcParamStart, a_SrcParamEnd) < 0) + { + // Something went wrong, fix the stack and exit + lua_pop(m_LuaState, 2); + return -1; + } + + // Call the function, with an error handler: + int s = lua_pcall(m_LuaState, a_SrcParamEnd - a_SrcParamStart + 1, LUA_MULTRET, OldTop); + if (ReportErrors(s)) + { + LOGWARN("Error while calling function '%s' in '%s'", a_FunctionName.c_str(), m_SubsystemName.c_str()); + // Fix the stack. + // We don't know how many values have been pushed, so just get rid of any that weren't there initially + int CurTop = lua_gettop(m_LuaState); + if (CurTop > OldTop) + { + lua_pop(m_LuaState, CurTop - OldTop); + } + return -1; + } + + // Reset the internal checking mechanisms: + m_NumCurrentFunctionArgs = -1; + + // Remove the error handler from the stack: + lua_remove(m_LuaState, OldTop + 1); + + // Return the number of return values: + return lua_gettop(m_LuaState) - OldTop; +} + + + + + +int cLuaState::CopyStackFrom(cLuaState & a_SrcLuaState, int a_SrcStart, int a_SrcEnd) +{ + /* + // DEBUG: + LOGD("Copying stack values from %d to %d", a_SrcStart, a_SrcEnd); + a_SrcLuaState.LogStack("Src stack before copying:"); + LogStack("Dst stack before copying:"); + */ + for (int i = a_SrcStart; i <= a_SrcEnd; ++i) + { + int t = lua_type(a_SrcLuaState, i); + switch (t) + { + case LUA_TNIL: + { + lua_pushnil(m_LuaState); + break; + } + case LUA_TSTRING: + { + AString s; + a_SrcLuaState.ToString(i, s); + Push(s); + break; + } + case LUA_TBOOLEAN: + { + bool b = (tolua_toboolean(a_SrcLuaState, i, false) != 0); + Push(b); + break; + } + case LUA_TNUMBER: + { + lua_Number d = tolua_tonumber(a_SrcLuaState, i, 0); + Push(d); + break; + } + case LUA_TUSERDATA: + { + // Get the class name: + const char * type = NULL; + if (lua_getmetatable(a_SrcLuaState, i) == 0) + { + LOGWARNING("%s: Unknown class in pos %d, cannot copy.", __FUNCTION__, i); + lua_pop(m_LuaState, i - a_SrcStart); + return -1; + } + lua_rawget(a_SrcLuaState, LUA_REGISTRYINDEX); // Stack +1 + type = lua_tostring(a_SrcLuaState, -1); + lua_pop(a_SrcLuaState, 1); // Stack -1 + + // Copy the value: + void * ud = tolua_touserdata(a_SrcLuaState, i, NULL); + tolua_pushusertype(m_LuaState, ud, type); + } + default: + { + LOGWARNING("%s: Unsupported value: '%s' at stack position %d. Can only copy numbers, strings, bools and classes!", + __FUNCTION__, lua_typename(a_SrcLuaState, t), i + ); + a_SrcLuaState.LogStack("Stack where copying failed:"); + lua_pop(m_LuaState, i - a_SrcStart); + return -1; + } + } + } + return a_SrcEnd - a_SrcStart + 1; +} + + + + + +void cLuaState::ToString(int a_StackPos, AString & a_String) +{ + size_t len; + const char * s = lua_tolstring(m_LuaState, a_StackPos, &len); + if (s != NULL) { - case LUA_TNONE: return "TNONE"; - case LUA_TNIL: return "TNIL"; - case LUA_TBOOLEAN: return "TBOOLEAN"; - case LUA_TLIGHTUSERDATA: return "TLIGHTUSERDATA"; - case LUA_TNUMBER: return "TNUMBER"; - case LUA_TSTRING: return "TSTRING"; - case LUA_TTABLE: return "TTABLE"; - case LUA_TFUNCTION: return "TFUNCTION"; - case LUA_TUSERDATA: return "TUSERDATA"; - case LUA_TTHREAD: return "TTHREAD"; + a_String.assign(s, len); } - return Printf("Unknown (%d)", Type); +} + + + + + +void cLuaState::LogStack(const char * a_Header) +{ + LogStack(m_LuaState, a_Header); +} + + + + + +void cLuaState::LogStack(lua_State * a_LuaState, const char * a_Header) +{ + LOGD((a_Header != NULL) ? a_Header : "Lua C API Stack contents:"); + for (int i = lua_gettop(a_LuaState); i >= 0; i--) + { + AString Value; + int Type = lua_type(a_LuaState, i); + switch (Type) + { + case LUA_TBOOLEAN: Value.assign((lua_toboolean(a_LuaState, i) != 0) ? "true" : "false"); break; + case LUA_TLIGHTUSERDATA: Printf(Value, "%p", lua_touserdata(a_LuaState, i)); break; + case LUA_TNUMBER: Printf(Value, "%f", (double)lua_tonumber(a_LuaState, i)); break; + case LUA_TSTRING: Printf(Value, "%s", lua_tostring(a_LuaState, i)); break; + default: break; + } + LOGD(" Idx %d: type %d (%s) %s", i, Type, lua_typename(a_LuaState, Type), Value.c_str()); + } // for i - stack idx } |