From bd61dc65c1302352aaa24339ee19b14f7a80b47a Mon Sep 17 00:00:00 2001
From: danieldg <danieldg@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Sun, 25 Oct 2009 15:21:57 +0000
Subject: [PATCH] Add vtable cross-check code (known to work with GCC 4.4
 x86_64)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@11976 e03df62e-2008-0410-955e-edbf42e46eb7
---
 src/modules/m_testnet.cpp | 163 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)

diff --git a/src/modules/m_testnet.cpp b/src/modules/m_testnet.cpp
index e467923c9..ff37adf3c 100644
--- a/src/modules/m_testnet.cpp
+++ b/src/modules/m_testnet.cpp
@@ -15,6 +15,164 @@
 
 #include "inspircd.h"
 
+struct vtbase
+{
+	virtual void isok(const char* name, int impl, Module* basemod, std::vector<std::string>& allmods) = 0;
+};
+
+template<typename T> struct vtable : public vtbase
+{
+	union u {
+		T function;
+		struct v {
+			size_t delta;
+			size_t vtoff;
+		} v;
+	} u;
+	vtable(T t) {
+		u.function = t;
+	}
+	/** member function pointer dereference from vtable; depends on the GCC 4.4 ABI (x86_64) */
+	template<typename E> void* read(E* obj)
+	{
+		if (u.v.delta & 1)
+		{
+			uint8_t* optr = reinterpret_cast<uint8_t*>(obj);
+			optr += u.v.vtoff;
+			uint8_t* vptr = *reinterpret_cast<uint8_t**>(optr);
+			vptr += u.v.delta - 1;
+			return *reinterpret_cast<void**>(vptr);
+		}
+		else
+			return reinterpret_cast<void*>(u.v.delta);
+	}
+	void isok(const char* name, int impl, Module* basemod, std::vector<std::string>& allmods)
+	{
+		void* base = read(basemod);
+		for(unsigned int i=0; i < allmods.size(); ++i)
+		{
+			Module* mod = ServerInstance->Modules->Find(allmods[i]);
+			void* fptr = read(mod);
+			for(EventHandlerIter j = ServerInstance->Modules->EventHandlers[impl].begin();
+				j != ServerInstance->Modules->EventHandlers[impl].end(); j++)
+			{
+				if (mod == *j)
+				{
+					if (fptr == base)
+					{
+						ServerInstance->SNO->WriteToSnoMask('a', "Module %s implements %s but uses default function",
+							mod->ModuleSourceFile.c_str(), name);
+					}
+					goto done;
+				}
+			}
+			if (fptr != base)
+			{
+				ServerInstance->SNO->WriteToSnoMask('a', "Module %s does not implement %s but overrides function",
+					mod->ModuleSourceFile.c_str(), name);
+			}
+			done:;
+		}
+	}
+};
+
+template<typename T> vtbase* vtinit(T t)
+{
+	return new vtable<T>(t);
+}
+
+static void checkall(Module* noimpl)
+{
+	std::vector<std::string> allmods = ServerInstance->Modules->GetAllModuleNames(0);
+#define CHK(name) do { \
+	vtbase* vt = vtinit(&Module::name); \
+	vt->isok(#name, I_ ## name, noimpl, allmods); \
+	delete vt; \
+} while (0)
+	CHK(OnUserConnect);
+	CHK(OnUserQuit);
+	CHK(OnUserDisconnect);
+	CHK(OnUserJoin);
+	CHK(OnUserPart);
+	CHK(OnRehash);
+	CHK(OnSendSnotice);
+	CHK(OnUserPreJoin);
+	CHK(OnUserPreKick);
+	CHK(OnUserKick);
+	CHK(OnOper);
+	CHK(OnInfo);
+	CHK(OnWhois);
+	CHK(OnUserPreInvite);
+	CHK(OnUserInvite);
+	CHK(OnUserPreMessage);
+	CHK(OnUserPreNotice);
+	CHK(OnUserPreNick);
+	CHK(OnUserMessage);
+	CHK(OnUserNotice);
+	CHK(OnMode);
+	CHK(OnGetServerDescription);
+	CHK(OnSyncUser);
+	CHK(OnSyncChannel);
+	CHK(OnDecodeMetaData);
+	CHK(OnWallops);
+	CHK(OnAcceptConnection);
+	CHK(OnChangeHost);
+	CHK(OnChangeName);
+	CHK(OnAddLine);
+	CHK(OnDelLine);
+	CHK(OnExpireLine);
+	CHK(OnUserPostNick);
+	CHK(OnPreMode);
+	CHK(On005Numeric);
+	CHK(OnKill);
+	CHK(OnRemoteKill);
+	CHK(OnLoadModule);
+	CHK(OnUnloadModule);
+	CHK(OnBackgroundTimer);
+	CHK(OnPreCommand);
+	CHK(OnCheckReady);
+	CHK(OnCheckInvite);
+	CHK(OnRawMode);
+	CHK(OnCheckKey);
+	CHK(OnCheckLimit);
+	CHK(OnCheckBan);
+	CHK(OnCheckChannelBan);
+	CHK(OnExtBanCheck);
+	CHK(OnStats);
+	CHK(OnChangeLocalUserHost);
+	CHK(OnPreTopicChange);
+	CHK(OnPostTopicChange);
+	CHK(OnEvent);
+	CHK(OnGlobalOper);
+	CHK(OnPostConnect);
+	CHK(OnAddBan);
+	CHK(OnDelBan);
+	CHK(OnChangeLocalUserGECOS);
+	CHK(OnUserRegister);
+	CHK(OnChannelPreDelete);
+	CHK(OnChannelDelete);
+	CHK(OnPostOper);
+	CHK(OnSyncNetwork);
+	CHK(OnSetAway);
+	CHK(OnUserList);
+	CHK(OnPostCommand);
+	CHK(OnPostJoin);
+	CHK(OnWhoisLine);
+	CHK(OnBuildNeighborList);
+	CHK(OnGarbageCollect);
+	CHK(OnText);
+	CHK(OnPassCompare);
+	CHK(OnRunTestSuite);
+	CHK(OnNamesListItem);
+	CHK(OnNumeric);
+	CHK(OnHookIO);
+	CHK(OnPreRehash);
+	CHK(OnModuleRehash);
+	CHK(OnSendWhoLine);
+	CHK(OnChangeIdent);
+	CHK(OnChannelRestrictionApply);
+}
+
 class CommandTest : public Command
 {
  public:
@@ -41,6 +199,11 @@ class CommandTest : public Command
 			int i = parameters.size() > 1 ? atoi(parameters[1].c_str()) : 2;
 			ServerInstance->SE->Shutdown(IS_LOCAL(user)->GetFd(), i);
 		}
+		else if (parameters[0] == "check")
+		{
+			checkall(creator);
+			ServerInstance->SNO->WriteToSnoMask('a', "Module check complete");
+		}
 		return CMD_SUCCESS;
 	}
 };
-- 
2.39.5