Tweaking some thread names.

src/xenia/cpu/debug_info.cc

@@ -68,7 +68,7 @@ SourceMapEntry* DebugInfo::LookupCodeOffset(uint32_t offset) {
       return entry;
     }
   }
-  return nullptr;
+  return source_map_count_ ? &source_map_entries_[0] : nullptr;
 }
 
 void DebugInfo::Dump() {

src/xenia/debug/server/xdp/xdp_server.cc

@@ -84,8 +84,7 @@ void XdpServer::AcceptClient(std::unique_ptr<Socket> client) {
 
   // Create a thread to manage the connection.
   client_thread_ = xe::threading::Thread::Create({}, [this]() {
-    // TODO(benvanik): GDB protocol stuff? Do we say hi?
-    // TODO(benvanik): move hello to thread
+    xe::threading::set_name("XDP Debug Server");
 
     // Let the debugger know we are present.
     debugger_->set_attached(true);

src/xenia/kernel/objects/xuser_module.cc

@@ -223,6 +223,12 @@ X_STATUS XUserModule::Launch(uint32_t flags) {
                                                 entry_point_, 0,
                                                 X_CREATE_SUSPENDED, true));
 
+  // We know this is the 'main thread'.
+  char thread_name[32];
+  snprintf(thread_name, xe::countof(thread_name), "Main XThread %04X",
+           thread->handle());
+  thread->set_name(thread_name);
+
   X_STATUS result = thread->Create();
   if (XFAILED(result)) {
     XELOGE("Could not create launch thread: %.8X", result);