added experimental optional natives (part 1)

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%401095

core/smn_core.cpp

@@ -330,20 +330,44 @@ static cell_t AutoExecConfig(IPluginContext *pContext, const cell_t *params)
 	return 1;
 }
 
+static cell_t MarkNativeAsOptional(IPluginContext *pContext, const cell_t *params)
+{
+	char *name;
+	uint32_t idx;
+	sp_context_t *ctx = pContext->GetContext();
+	CPlugin *pl = g_PluginSys.GetPluginByCtx(ctx);
+
+	if (!pl->IsInAskPluginLoad())
+	{
+		return pContext->ThrowNativeError("Calling MarkNativeAsOptional outside AskPluginLoad is not allowed");
+	}
+
+	pContext->LocalToString(params[1], &name);
+	if (pContext->FindNativeByName(name, &idx) != SP_ERROR_NONE)
+	{
+		return pContext->ThrowNativeError("Unable to find native \"%s\"", name);
+	}
+
+	ctx->natives[idx].flags |= SP_NTVFLAG_OPTIONAL;
+
+	return 1;
+}
+
 REGISTER_NATIVES(coreNatives)
 {
-	{"AutoExecConfig",		AutoExecConfig},
-	{"GetPluginFilename",	GetPluginFilename},
-	{"GetPluginInfo",		GetPluginInfo},
-	{"GetPluginIterator",	GetPluginIterator},
-	{"GetPluginStatus",		GetPluginStatus},
-	{"GetSysTickCount",		GetSysTickCount},
-	{"GetTime",				GetTime},
-	{"IsPluginDebugging",	IsPluginDebugging},
-	{"MorePlugins",			MorePlugins},
-	{"ReadPlugin",			ReadPlugin},
-	{"ThrowError",			ThrowError},
-	{"SetFailState",		SetFailState},
-	{"FormatTime",			FormatTime},
-	{NULL,					NULL},
+	{"AutoExecConfig",			AutoExecConfig},
+	{"GetPluginFilename",		GetPluginFilename},
+	{"GetPluginInfo",			GetPluginInfo},
+	{"GetPluginIterator",		GetPluginIterator},
+	{"GetPluginStatus",			GetPluginStatus},
+	{"GetSysTickCount",			GetSysTickCount},
+	{"GetTime",					GetTime},
+	{"IsPluginDebugging",		IsPluginDebugging},
+	{"MorePlugins",				MorePlugins},
+	{"ReadPlugin",				ReadPlugin},
+	{"ThrowError",				ThrowError},
+	{"SetFailState",			SetFailState},
+	{"FormatTime",				FormatTime},
+	{"MarkNativeAsOptional",	MarkNativeAsOptional},
+	{NULL,						NULL},
 };

core/systems/ExtensionSys.cpp

@@ -529,13 +529,19 @@ void CExtensionManager::BindAllNativesToPlugin(IPlugin *pPlugin)
 			 n_iter++)
 		{
 			natives = (*n_iter);
+			uint32_t idx;
 			unsigned int i=0;
 			while (natives[i].func != NULL && natives[i].name != NULL)
 			{
-				if (pContext->BindNative(&natives[i++]) == SP_ERROR_NONE)
+				if (pContext->BindNative(&natives[i]) == SP_ERROR_NONE)
 				{
-					set = true;
+					pContext->FindNativeByName(natives[i].name, &idx);
+					if (!(pContext->GetContext()->natives[idx].flags & SP_NTVFLAG_OPTIONAL))
+					{
+						set = true;
+					}
 				}
+				i++;
 			}
 		}
 		if (set && (pExt->m_Plugins.find(pPlugin) == pExt->m_Plugins.end()))

core/systems/PluginSys.cpp

@@ -357,15 +357,19 @@ bool CPlugin::Call_AskPluginLoad(char *error, size_t maxlength)
 		return true;
 	}
 
+	m_IsInAskPluginLoad = true;
 	pFunction->PushCell(m_handle);
 	pFunction->PushCell(g_PluginSys.IsLateLoadTime() ? 1 : 0);
 	pFunction->PushStringEx(error, maxlength, 0, SM_PARAM_COPYBACK);
 	pFunction->PushCell(maxlength);
 	if ((err=pFunction->Execute(&result)) != SP_ERROR_NONE)
 	{
+		m_IsInAskPluginLoad = false;
 		return false;
 	}
 
+	m_IsInAskPluginLoad = false;
+
 	if (!result || m_status != Plugin_Loaded)
 	{
 		return false;
@@ -1098,7 +1102,8 @@ bool CPluginManager::RunSecondPass(CPlugin *pPlugin, char *error, size_t maxleng
 			break;
 		}
 		if (native->status == SP_NATIVE_UNBOUND
-			&& native->name[0] != '@')
+			&& native->name[0] != '@'
+			&& !(native->flags & SP_NTVFLAG_OPTIONAL))
 		{
 			if (error)
 			{
@@ -1176,7 +1181,7 @@ void CPluginManager::TryRefreshNatives(CPlugin *pPlugin)
 		{
 			break;
 		}
-		if (native->status == SP_NATIVE_UNBOUND)
+		if (native->status == SP_NATIVE_UNBOUND && !(native->flags & SP_NTVFLAG_OPTIONAL))
 		{
 			pPlugin->SetErrorState(Plugin_Error, "Native not found: %s", native->name);
 			return;
@@ -1213,6 +1218,12 @@ void CPluginManager::AddFakeNativesToPlugin(CPlugin *pPlugin)
 		native.func = pNative->func;
 		if (pContext->BindNative(&native) == SP_ERROR_NONE)
 		{
+			uint32_t idx;
+			pContext->FindNativeByName(native.name, &idx);
+			if (!(pPlugin->GetContext()->natives[idx].flags & SP_NTVFLAG_OPTIONAL))
+			{
+				continue;
+			}
 			/* Add us as a dependency, but we're careful not to do this circularly! */
 			if (pNative->ctx != pContext)
 			{

core/systems/PluginSys.h

@@ -234,6 +234,10 @@ public:
 	void AddConfig(bool autoCreate, const char *cfg, const char *folder);
 	unsigned int GetConfigCount();
 	AutoConfig *GetConfig(unsigned int i);
+	inline bool IsInAskPluginLoad()
+	{
+		return m_IsInAskPluginLoad;
+	}
 protected:
 	void UpdateInfo();
 	void SetTimeStamp(time_t t);
@@ -258,6 +262,7 @@ private:
 	Trie *m_pProps;
 	bool m_FakeNativesMissing;
 	CVector<AutoConfig *> m_configs;
+	bool m_IsInAskPluginLoad;
 };
 
 class CPluginManager :