Two InitializeDebugger functions

Author: qxy11

lldb/tools/lldb-dap/DAP.cpp

@@ -1321,38 +1321,30 @@ void DAP::StartEventThreads() {
   StartEventThread();
 }
 
-llvm::Error DAP::InitializeDebugger(std::optional<int> debugger_id,
-                                    std::optional<lldb::user_id_t> target_id) {
-  // Validate that both debugger_id and target_id are provided together.
-  if (debugger_id.has_value() != target_id.has_value()) {
+llvm::Error DAP::InitializeDebugger(int debugger_id,
+                                    lldb::user_id_t target_id) {
+  // Find the existing debugger by ID
+  debugger = lldb::SBDebugger::FindDebuggerWithID(debugger_id);
+  if (!debugger.IsValid()) {
     return llvm::createStringError(
-        "Both debuggerId and targetId must be specified together for debugger "
-        "reuse, or both must be omitted to create a new debugger");
+        "Unable to find existing debugger for debugger ID");
   }
 
-  // Initialize debugger instance (shared or individual).
-  if (debugger_id && target_id) {
-    // Find the existing debugger by ID
-    debugger = lldb::SBDebugger::FindDebuggerWithID(*debugger_id);
-    if (!debugger.IsValid()) {
-      return llvm::createStringError(
-          "Unable to find existing debugger for debugger ID");
-    }
-
-    // Find the target within the debugger by its globally unique ID
-    lldb::SBTarget shared_target =
-        debugger.FindTargetByGloballyUniqueID(*target_id);
-    if (!shared_target.IsValid()) {
-      return llvm::createStringError(
-          "Unable to find existing target for target ID");
-    }
-
-    // Set the target for this DAP session.
-    SetTarget(shared_target);
-    StartEventThreads();
-    return llvm::Error::success();
+  // Find the target within the debugger by its globally unique ID
+  lldb::SBTarget shared_target =
+      debugger.FindTargetByGloballyUniqueID(target_id);
+  if (!shared_target.IsValid()) {
+    return llvm::createStringError(
+        "Unable to find existing target for target ID");
   }
 
+  // Set the target for this DAP session.
+  SetTarget(shared_target);
+  StartEventThreads();
+  return llvm::Error::success();
+}
+
+llvm::Error DAP::InitializeDebugger() {
   debugger = lldb::SBDebugger::Create(/*argument_name=*/false);
 
   // Configure input/output/error file descriptors.

lldb/tools/lldb-dap/DAP.h

@@ -426,10 +426,18 @@ struct DAP final : public DAPTransport::MessageHandler {
   /// DAP debugger initialization functions.
   /// @{
 
-  /// Perform complete DAP initialization in one call.
-  llvm::Error
-  InitializeDebugger(std::optional<int> debugger_id = std::nullopt,
-                     std::optional<lldb::user_id_t> target_id = std::nullopt);
+  /// Perform complete DAP initialization for a new debugger.
+  llvm::Error InitializeDebugger();
+
+  /// Perform complete DAP initialization by reusing an existing debugger and
+  /// target.
+  ///
+  /// \param[in] debugger_id
+  ///     The ID of the existing debugger to reuse.
+  ///
+  /// \param[in] target_id
+  ///     The globally unique ID of the existing target to reuse.
+  llvm::Error InitializeDebugger(int debugger_id, lldb::user_id_t target_id);
 
   /// Start event handling threads based on client capabilities.
   void StartEventThreads();

lldb/tools/lldb-dap/Handler/AttachRequestHandler.cpp

@@ -34,7 +34,17 @@ Error AttachRequestHandler::Run(const AttachRequestArguments &args) const {
   // launched debugger.
   std::optional<int> debugger_id = args.debuggerId;
   std::optional<lldb::user_id_t> target_id = args.targetId;
-  if (Error err = dap.InitializeDebugger(debugger_id, target_id))
+
+  // Validate that both debugger_id and target_id are provided together.
+  if (debugger_id.has_value() != target_id.has_value()) {
+    return llvm::createStringError(
+        "Both debuggerId and targetId must be specified together for debugger "
+        "reuse, or both must be omitted to create a new debugger");
+  }
+
+  if (Error err = debugger_id && target_id
+                      ? dap.InitializeDebugger(*debugger_id, *target_id)
+                      : dap.InitializeDebugger())
     return err;
 
   // Validate that we have a well formed attach request.