core/types, doc/conventions, builtin: NullptrCatch

builtin/ground_plane_lighting/ground_plane_lighting.cpp

@@ -272,61 +272,66 @@ struct CInstance: public ground_plane_lighting::Instance
 
 	void on_node_volume_updated(const voxelworld::NodeVolumeUpdated &event)
 	{
-		if(!event.is_static_chunk)
-			return;
-		if(event.scene != m_scene_ref)
-			return;
-		log_v(MODULE, "Checking ground level in chunk " PV3I_FORMAT,
-				PV3I_PARAMS(event.chunk_p));
-		const pv::Vector3DInt32 &chunk_p = event.chunk_p;
-		voxelworld::access(m_server, [&](voxelworld::Interface *ivoxelworld)
-		{
-			voxelworld::Instance *world =
-					check(ivoxelworld->get_instance(m_scene_ref));
-			interface::VoxelRegistry *voxel_reg = world->get_voxel_reg();
-			//const auto &chunk_size_voxels = world->get_chunk_size_voxels();
-			pv::Region chunk_region =
-				world->get_chunk_region_voxels(chunk_p);
+		try {
+			if(!event.is_static_chunk)
+				return;
+			if(event.scene != m_scene_ref)
+				return;
+			log_v(MODULE, "Checking ground level in chunk " PV3I_FORMAT,
+					PV3I_PARAMS(event.chunk_p));
+			const pv::Vector3DInt32 &chunk_p = event.chunk_p;
+			voxelworld::access(m_server, [&](voxelworld::Interface *ivoxelworld)
+			{
+				voxelworld::Instance *world =
+						check(ivoxelworld->get_instance(m_scene_ref));
+				interface::VoxelRegistry *voxel_reg = world->get_voxel_reg();
+				//const auto &chunk_size_voxels = world->get_chunk_size_voxels();
+				pv::Region chunk_region =
+					world->get_chunk_region_voxels(chunk_p);
 
-			auto lc = chunk_region.getLowerCorner();
-			auto uc = chunk_region.getUpperCorner();
-			//log_nv(MODULE, "yst=[");
-			for(int z = lc.getZ(); z <= uc.getZ(); z++){
-				for(int x = lc.getX(); x <= uc.getX(); x++){
-					int32_t yst0 = get_yst(x, z);
-					if(yst0 > uc.getY()){
-						// Y-seethrough doesn't reach here
-						continue;
-					}
-					int y = uc.getY();
-					for(;; y--){
-						VoxelInstance v = world->get_voxel(
-									pv::Vector3DInt32(x, y, z), true);
-						if(v.get_id() == interface::VOXELTYPEID_UNDEFINED){
-							// NOTE: This leaves the chunks below unhandled;
-							// there would have to be some kind of a dirty
-							// flag based on which this seach would be
-							// continued at a later point when the chunk
-							// gets loaded
-							break;
+				auto lc = chunk_region.getLowerCorner();
+				auto uc = chunk_region.getUpperCorner();
+				//log_nv(MODULE, "yst=[");
+				for(int z = lc.getZ(); z <= uc.getZ(); z++){
+					for(int x = lc.getX(); x <= uc.getX(); x++){
+						int32_t yst0 = get_yst(x, z);
+						if(yst0 > uc.getY()){
+							// Y-seethrough doesn't reach here
+							continue;
 						}
-						const auto *def = voxel_reg->get_cached(v);
-						if(!def)
-							throw Exception(ss_()+"Undefined voxel: "+
-									itos(v.get_id()));
-						bool light_passes = (!def || !def->physically_solid);
-						if(!light_passes)
-							break;
+						int y = uc.getY();
+						for(;; y--){
+							VoxelInstance v = world->get_voxel(
+										pv::Vector3DInt32(x, y, z), true);
+							if(v.get_id() == interface::VOXELTYPEID_UNDEFINED){
+								// NOTE: This leaves the chunks below unhandled;
+								// there would have to be some kind of a dirty
+								// flag based on which this seach would be
+								// continued at a later point when the chunk
+								// gets loaded
+								break;
+							}
+							const auto *def = voxel_reg->get_cached(v);
+							if(!def)
+								throw Exception(ss_()+"Undefined voxel: "+
+										itos(v.get_id()));
+							bool light_passes = (!def || !def->physically_solid);
+							if(!light_passes)
+								break;
+						}
+						// The first voxel downwards from the top of the world that
+						// doesn't pass light
+						int32_t yst1 = y;
+						//log_nv(MODULE, "%i -> %i, ", yst0, yst1);
+						set_yst(x, z, yst1);
 					}
-					// The first voxel downwards from the top of the world that
-					// doesn't pass light
-					int32_t yst1 = y;
-					//log_nv(MODULE, "%i -> %i, ", yst0, yst1);
-					set_yst(x, z, yst1);
 				}
-			}
-			//log_v(MODULE, "]");
-		});
+				//log_v(MODULE, "]");
+			});
+		} catch(NullptrCatch &e){
+			// Something was probably deleted or unloaded
+			log_v(MODULE, "NullptrCatch: %s", e.what());
+		}
 	}
 
 	void send_initial_sectors(int peer)

builtin/main_context/main_context.cpp

@@ -217,7 +217,7 @@ struct Module: public interface::Module, public main_context::Interface
 	{
 		Scene *scene = find_scene(ref);
 		if(!scene)
-			throw Exception("check_scene(): Scene not found");
+			throw NullptrCatch("check_scene(): Scene not found");
 		return scene;
 	}
 

builtin/worldgen/worldgen.cpp

@@ -94,22 +94,27 @@ struct CInstance: public worldgen::Instance
 	//       queued but instead sectors get queued in the event queue.
 	void generate_next_section()
 	{
-		if(!m_enabled)
-			throw Exception("generate_next_section(): Not enabled");
-		if(m_queued_sections.empty())
-			return;
-		const pv::Vector3DInt16 section_p = m_queued_sections.front();
-		m_queued_sections.pop_front();
+		try {
+			if(!m_enabled)
+				throw Exception("generate_next_section(): Not enabled");
+			if(m_queued_sections.empty())
+				return;
+			const pv::Vector3DInt16 section_p = m_queued_sections.front();
+			m_queued_sections.pop_front();
 
-		log_v(MODULE, "Generating section (%i, %i, %i); queue size: %zu",
-				section_p.getX(), section_p.getY(), section_p.getZ(),
-				m_queued_sections.size());
+			log_v(MODULE, "Generating section (%i, %i, %i); queue size: %zu",
+					section_p.getX(), section_p.getY(), section_p.getZ(),
+					m_queued_sections.size());
 
-		if(m_generator)
-			m_generator->generate_section(m_server, m_scene_ref, section_p);
+			if(m_generator)
+				m_generator->generate_section(m_server, m_scene_ref, section_p);
 
-		m_server->emit_event("worldgen:queue_modified",
-				new QueueModifiedEvent(m_scene_ref, m_queued_sections.size()));
+			m_server->emit_event("worldgen:queue_modified",
+					new QueueModifiedEvent(m_scene_ref, m_queued_sections.size()));
+		} catch(NullptrCatch &e){
+			// Something was probably deleted or unloaded
+			log_v(MODULE, "NullptrCatch: %s", e.what());
+		}
 	}
 
 	// Interface

doc/conventions.txt

@@ -73,7 +73,7 @@ Non-exception throwing and exception-throwing methods
 -----------------------------------------------------
 - get_x: Returns nullptr or equivalent if not found
 - find_x: Returns nullptr or equivalent if not found
-- check_x: Throws exception if not found
+- check_x: Throws NullptrCatch if not found
 
 To check for nullptr returned by get_x() or find_x(), use the check() function
 in core/types.h.

src/core/types.h

@@ -66,7 +66,9 @@ struct Exception: public std::exception {
 	}
 };
 #define DEFINE_EXCEPTION(name, base) struct name: public base \
-{name(const ss_ &msg = ""): base(ss_()+#name+msg){}}
+{name(const ss_ &msg): base(msg){}}
+
+DEFINE_EXCEPTION(NullptrCatch, Exception);
 
 static inline ss_ itos(int64_t i){
 	char buf[22];
@@ -152,13 +154,13 @@ static inline cc_* cs(const T &v){
 template<typename T>
 static inline T* check(T *v){
 	if(v == nullptr)
-		throw Exception("check(): nullptr");
+		throw NullptrCatch("check(): nullptr");
 	return v;
 }
 template<typename T>
 static inline const T* check(const T *v){
 	if(v == nullptr)
-		throw Exception("check(): nullptr");
+		throw NullptrCatch("check(): nullptr");
 	return v;
 }
 

src/server/state.cpp

@@ -315,7 +315,7 @@ void ModuleThread::handle_direct_cb(
 			log_t(MODULE, "M[%s] ~direct_cb(): Executed",
 					cs(mc->info.name));
 		} catch(...){
-			log_v(MODULE, "M[%s] ~direct_cb() failed (exception)",
+			log_t(MODULE, "M[%s] ~direct_cb() failed (exception)",
 					cs(mc->info.name));
 			// direct_cb() exception should not directly shutdown the
 			// server; instead they are passed to the caller. Eventually