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TPT: Prevent accidental infinite loops in lua, fixes #115

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This commit is contained in:
Simon Robertshaw 2012-08-20 18:37:42 +01:00
parent 51a0fb2d45
commit 72e441132f
3 changed files with 29 additions and 9 deletions
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1
src/cat/LuaScriptHelper.h
View File

@ -30,6 +30,7 @@ int tptPropertiesVersion;
int tptElements; //Table for TPT element names
int tptParts, tptPartsMeta, tptElementTransitions, tptPartsCData, tptPartMeta, tptPart, cIndex;
void luacon_hook(lua_State *L, lua_Debug *ar);
int luacon_step(int mx, int my, int selectl, int selectr, int bsx, int bsy);
int luacon_mouseevent(int mx, int my, int mb, int event, int mouse_wheel);
int luacon_keyevent(int key, int modifier, int event);

36
src/cat/LuaScriptInterface.cpp
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@ -25,6 +25,7 @@
#else
#include <sys/stat.h>
#endif
#include <time.h>
LuaScriptInterface::LuaScriptInterface(GameModel * m):
CommandInterface(m),
@ -141,6 +142,7 @@ LuaScriptInterface::LuaScriptInterface(GameModel * m):
lua_setfield(l, tptPropertiesVersion, "build");
lua_setfield(l, tptProperties, "version");
lua_sethook(l, &luacon_hook, LUA_MASKCOUNT, 200);
#ifdef FFI
//LuaJIT's ffi gives us direct access to parts data, no need for nested metatables. HOWEVER, this is in no way safe, it's entirely possible for someone to try to read parts[-10]
lua_pushlightuserdata(l, parts);
@ -300,6 +302,7 @@ bool LuaScriptInterface::OnKeyRelease(int key, Uint16 character, bool shift, boo
void LuaScriptInterface::OnTick()
{
LoopTime = clock();
if(luacon_mousedown)
luacon_mouseevent(luacon_mousex, luacon_mousey, luacon_mousebutton, LUACON_MPRESS, 0);
luacon_step(luacon_mousex, luacon_mousey, luacon_selectedl, luacon_selectedr, luacon_brushx, luacon_brushy);
@ -319,6 +322,7 @@ int LuaScriptInterface::Command(std::string command)
int ret;
lastError = "";
currentCommand = true;
LoopTime = clock();
if((ret = luaL_dostring(l, command.c_str())))
{
lastError = luacon_geterror();
@ -874,28 +878,42 @@ int luacon_step(int mx, int my, int selectl, int selectr, int bsx, int bsy){
lua_setfield(luacon_ci->l, tptProperties, "selectedr");
lua_setfield(luacon_ci->l, tptProperties, "brushx");
lua_setfield(luacon_ci->l, tptProperties, "brushy");
if(step_functions[0]){
//Set mouse globals
for(i = 0; i<6; i++){
if(step_functions[i]){
lua_rawgeti(luacon_ci->l, LUA_REGISTRYINDEX, step_functions[i]);
callret = lua_pcall(luacon_ci->l, 0, 0, 0);
if (callret)
for(i = 0; i<6; i++){
if(step_functions[i]){
lua_rawgeti(luacon_ci->l, LUA_REGISTRYINDEX, step_functions[i]);
callret = lua_pcall(luacon_ci->l, 0, 0, 0);
if (callret)
{
if (!strcmp(luacon_geterror(),"Error: Script not responding"))
{
luacon_ci->Log(CommandInterface::LogError, luacon_geterror());
luacon_ci->LoopTime = clock();
lua_pushcfunction(luacon_ci->l, &luatpt_unregister_step);
lua_rawgeti(luacon_ci->l, LUA_REGISTRYINDEX, step_functions[i]);
lua_pcall(luacon_ci->l, 1, 0, 0);
}
luacon_ci->Log(CommandInterface::LogError, luacon_geterror());
}
}
return tempret;
}
return 0;
}
int luacon_eval(char *command){
luacon_ci->LoopTime = clock();
return luaL_dostring (luacon_ci->l, command);
}
void luacon_hook(lua_State * l, lua_Debug * ar)
{
if(ar->event == LUA_HOOKCOUNT && clock()-luacon_ci->LoopTime > CLOCKS_PER_SEC*3)
{
if(ConfirmPrompt::Blocking("Script not responding", "The Lua script may have stopped responding. There might be an infinite loop. Press \"Stop\" to stop it", "Stop"))
luaL_error(l, "Error: Script not responding");
luacon_ci->LoopTime = clock();
}
}
char *luacon_geterror(){
char *error = (char*)lua_tostring(luacon_ci->l, -1);
if(error==NULL || !error[0]){

1
src/cat/LuaScriptInterface.h
View File

@ -40,6 +40,7 @@ class LuaScriptInterface: public CommandInterface {
bool currentCommand;
TPTScriptInterface * legacy;
public:
int LoopTime;
lua_State *l;
LuaScriptInterface(GameModel * m);
virtual bool OnBrushChanged(int brushType, int rx, int ry);