Hi,
I have been trying to track down a crash in my game and I think I have narrowed it down to `X64_CallFunction` in `as_callfunc_x64_gcc.cpp`.
The function `CallSystemFunction` (above in the callstack) is given the object as `(void *) 0x559ee40` but when my native function is called (it is a member function) I get `(Leviathan::Physics * const) 0x565ff08` which is invalid as when I inspect the members they are garbage.
But if I try `*(Leviathan::Physics * const) 0x559ee40` that has the correct values. So AngelScript does something to the object pointer.
Additionally if I change the registration to use asCALL_GENERIC the issue goes away and my function is given the right `this` pointer. Other member functions on that type work fine. For some reason it is just this one.
// This crashes
if(engine->RegisterObjectMethod("Physics", "Float3 ClearVelocity() const",
asMETHOD(Physics, ClearVelocity), asCALL_THISCALL) < 0) {
ANGELSCRIPT_REGISTERFAIL;
}
// This doesn't
// if(engine->RegisterObjectMethod("Physics", "Float3 ClearVelocity() const",
// WRAP_MFN(Physics, ClearVelocity), asCALL_GENERIC) < 0) {
// ANGELSCRIPT_REGISTERFAIL;
// }And here is a callstack of the crash:
0 in Leviathan::Physics::ClearVelocity() of /home/hhyyrylainen/Projects/Leviathan/Engine/Entities/Components.cpp:369
1 in X64_CallFunction of /home/hhyyrylainen/Projects/Leviathan/ThirdParty/angelscript/sdk/angelscript/source/as_callfunc_x64_gcc.cpp:74
2 in CallSystemFunctionNative of /home/hhyyrylainen/Projects/Leviathan/ThirdParty/angelscript/sdk/angelscript/source/as_callfunc_x64_gcc.cpp:468
3 in CallSystemFunction(int, asCContext*) of /home/hhyyrylainen/Projects/Leviathan/ThirdParty/angelscript/sdk/angelscript/source/as_callfunc.cpp:730
4 in asCContext::ExecuteNext of /home/hhyyrylainen/Projects/Leviathan/ThirdParty/angelscript/sdk/angelscript/source/as_context.cpp:2557
5 in asCContext::Execute() of /home/hhyyrylainen/Projects/Leviathan/ThirdParty/angelscript/sdk/angelscript/source/as_context.cpp:1324
6 in Leviathan::ScriptExecutor::RunScript<void, thrive::CellStageWorld*> of /usr/include/c++/8/ext/atomicity.h:96
7 in Leviathan::ScriptExecutor::RunScript<void, thrive::CellStageWorld*> of /home/hhyyrylainen/Projects/thrive/ThirdParty/Leviathan/Engine/Script/ScriptExecutor.h:86
8 in Leviathan::GameModule::ExecuteOnModule<void, thrive::CellStageWorld*> of /home/hhyyrylainen/Projects/thrive/ThirdParty/Leviathan/Engine/Addons/GameModule.h:63
9 in thrive::ThriveGame::startNewGame() of /home/hhyyrylainen/Projects/thrive/src/ThriveGame.cpp:329
10 in thrive::ThriveJSMessageHandler::OnProcessMessageReceived(scoped_refptr<CefBrowser>, cef_process_id_t, scoped_refptr<CefProcessMessage>) of /home/hhyyrylainen/Projects/thrive/src/thrive_js_interface.cpp:142
11 in Leviathan::GlobalCEFHandler::HandleCustomExtensionProcessMessage(scoped_refptr<CefBrowser>, cef_process_id_t, scoped_refptr<CefProcessMessage>) of /home/hhyyrylainen/Projects/Leviathan/Engine/GlobalCEFHandler.cpp:282
12 in Leviathan::GUI::View::OnProcessMessageReceived(scoped_refptr<CefBrowser>, cef_process_id_t, scoped_refptr<CefProcessMessage>) of /home/hhyyrylainen/Projects/Leviathan/Engine/GUI/GuiView.cpp:634
13 in (anonymous namespace)::client_on_process_message_received of /home/hhyyrylainen/Projects/Leviathan/ThirdParty/CEF/libcef_dll/cpptoc/client_cpptoc.cc:269
14 in OnProcessMessageReceived of ../../cef/libcef_dll/ctocpp/client_ctocpp.cc:237
15 in OnRequest of ../../cef/libcef/browser/browser_host_impl.cc:3006
16 in DispatchToMethodImpl<CefBrowserHostImpl*, void (CefBrowserHostImpl::*)(Cef_Request_Params const&), std::__1::tuple<Cef_Request_Params>, 0> of ../../base/tuple.h:52
17 in DispatchToMethod<CefBrowserHostImpl*, void (CefBrowserHostImpl::*)(Cef_Request_Params const&), std::__1::tuple<Cef_Request_Params> > of ../../base/tuple.h:60
18 in DispatchToMethod<CefBrowserHostImpl, void (CefBrowserHostImpl::*)(Cef_Request_Params const&), void, std::__1::tuple<Cef_Request_Params> > of ../../ipc/ipc_message_templates.h:51
19 in Dispatch<CefBrowserHostImpl, CefBrowserHostImpl, void, void (CefBrowserHostImpl::*)(Cef_Request_Params const&)> of ../../ipc/ipc_message_templates.h:146
20 in OnMessageReceived of ../../cef/libcef/browser/browser_host_impl.cc:2849
21 in OnMessageReceived of ../../content/browser/web_contents/web_contents_impl.cc:791
22 in OnMessageReceived of ../../content/browser/renderer_host/render_view_host_impl.cc:739
23 in OnMessageReceived of ../../content/browser/renderer_host/render_widget_host_impl.cc:594
24 in OnDispatchMessage of ../../ipc/ipc_channel_proxy.cc:320
25 in Run of ../../base/callback.h:65
26 in RunTask of ../../base/debug/task_annotator.cc:55
27 in RunTask of ../../base/message_loop/message_loop.cc:399
28 in DeferOrRunPendingTask of ../../base/message_loop/message_loop.cc:411
29 in DoWork of ../../base/message_loop/message_loop.cc:455
30 in base::MessagePumpGlib::Run(base::MessagePump::Delegate*) of ../../base/message_loop/message_pump_glib.cc:309
31 in Run of ../../base/run_loop.cc:130
32 in RunUntilIdle of ../../base/run_loop.cc:143
33 in CefBrowserMessageLoop::DoMessageLoopIteration() of ../../cef/libcef/browser/browser_message_loop.cc:116
34 in Leviathan::GlobalCEFHandler::DoCEFMessageLoopWork() of /home/hhyyrylainen/Projects/Leviathan/Engine/GlobalCEFHandler.cpp:181
35 in Leviathan::Engine::MessagePump() of /home/hhyyrylainen/Projects/Leviathan/Engine/Engine.cpp:657
36 in Leviathan::LeviathanApplication::RunMessageLoop() of /home/hhyyrylainen/Projects/Leviathan/Engine/Application/Application.cpp:124
37 in main of /home/hhyyrylainen/Projects/thrive/src/main.cpp:219
38 in __libc_start_main of /lib64/libc.so.6
39 in _start of /home/hhyyrylainen/Projects/thrive/src/main.cpp:172I am using svn revision 2547 (I used 2482 before but I just updated to confirm that this hasn't been fixed). My compiler is 'gcc (GCC) 8.1.1 20180712 (Red Hat 8.1.1-5)'
This issue also seems to be Linux specific as other people also working on the same game on Windows don't have a crash in this function (I haven't personally tested on Windows).
I can provide a core dump of the invalid passed this pointer if that would help.
