[Lldb-commits] [lldb] [lldb-dap] Migrating DAP 'initialize' to new typed RequestHandler. (PR #133007)

John Harrison via lldb-commits lldb-commits at lists.llvm.org
Tue Mar 25 14:59:37 PDT 2025


https://github.com/ashgti created https://github.com/llvm/llvm-project/pull/133007

This adds new types and helpers to support the 'initialize' request with the new typed RequestHandler. While working on this I found there were a few cases where we incorrectly treated initialize arguments as capabilities. The new `lldb_dap::protocol::InitializeRequestArguments` and `lldb_dap::protocol::Capabilities` uncovered the inconsistencies.

>From 045101907513d445fdeb8c06da08467032c4c3d0 Mon Sep 17 00:00:00 2001
From: John Harrison <harjohn at google.com>
Date: Tue, 25 Mar 2025 14:58:03 -0700
Subject: [PATCH] [lldb-dap] Migrating DAP 'initialize' to new typed
 RequestHandler.

This adds new types and helpers to support the 'initialize' request with the new typed RequestHandler. While working on this I found there were a few cases where we incorrectly treated initialize arguments as capabilities. The new `lldb_dap::protocol::InitializeRequestArguments` and `lldb_dap::protocol::Capabilities` uncovered the inconsistencies.
---
 .../test/tools/lldb-dap/dap_server.py         |   5 +-
 .../tools/lldb-dap/launch/TestDAP_launch.py   |   3 +-
 lldb/tools/lldb-dap/DAP.cpp                   | 145 ++++++++--
 lldb/tools/lldb-dap/DAP.h                     |   6 +-
 .../Handler/InitializeRequestHandler.cpp      | 162 ++---------
 .../tools/lldb-dap/Handler/RequestHandler.cpp |   1 +
 lldb/tools/lldb-dap/Handler/RequestHandler.h  |  89 +++---
 lldb/tools/lldb-dap/JSONUtils.cpp             |  34 +--
 lldb/tools/lldb-dap/JSONUtils.h               |   3 +-
 .../lldb-dap/Protocol/ProtocolRequests.cpp    |  52 ++++
 .../lldb-dap/Protocol/ProtocolRequests.h      |  69 +++++
 .../tools/lldb-dap/Protocol/ProtocolTypes.cpp | 199 ++++++++++++++
 lldb/tools/lldb-dap/Protocol/ProtocolTypes.h  | 255 ++++++++++++++++++
 13 files changed, 800 insertions(+), 223 deletions(-)

diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
index 359ac718138b2..01ef4b68f2653 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
@@ -776,7 +776,8 @@ def request_initialize(self, sourceInitFile):
                 "supportsVariablePaging": True,
                 "supportsVariableType": True,
                 "supportsStartDebuggingRequest": True,
-                "sourceInitFile": sourceInitFile,
+                "supportsProgressReporting": True,
+                "$__lldb_sourceInitFile": sourceInitFile,
             },
         }
         response = self.send_recv(command_dict)
@@ -1261,7 +1262,7 @@ def launch(cls, /, executable, env=None, log_file=None, connection=None):
         expected_prefix = "Listening for: "
         out = process.stdout.readline().decode()
         if not out.startswith(expected_prefix):
-            self.process.kill()
+            process.kill()
             raise ValueError(
                 "lldb-dap failed to print listening address, expected '{}', got '{}'".format(
                     expected_prefix, out
diff --git a/lldb/test/API/tools/lldb-dap/launch/TestDAP_launch.py b/lldb/test/API/tools/lldb-dap/launch/TestDAP_launch.py
index 0c92e5bff07c6..64c99019a1c9b 100644
--- a/lldb/test/API/tools/lldb-dap/launch/TestDAP_launch.py
+++ b/lldb/test/API/tools/lldb-dap/launch/TestDAP_launch.py
@@ -524,8 +524,7 @@ def test_version(self):
 
         # The first line is the prompt line like "(lldb) version", so we skip it.
         version_eval_output_without_prompt_line = version_eval_output.splitlines()[1:]
-        lldb_json = self.dap_server.get_initialize_value("__lldb")
-        version_string = lldb_json["version"]
+        version_string = self.dap_server.get_initialize_value("$__lldb_version")
         self.assertEqual(
             version_eval_output_without_prompt_line,
             version_string.splitlines(),
diff --git a/lldb/tools/lldb-dap/DAP.cpp b/lldb/tools/lldb-dap/DAP.cpp
index 65de0488729e5..0da8ce43f73c4 100644
--- a/lldb/tools/lldb-dap/DAP.cpp
+++ b/lldb/tools/lldb-dap/DAP.cpp
@@ -14,6 +14,7 @@
 #include "LLDBUtils.h"
 #include "OutputRedirector.h"
 #include "Protocol/ProtocolBase.h"
+#include "Protocol/ProtocolTypes.h"
 #include "Transport.h"
 #include "lldb/API/SBBreakpoint.h"
 #include "lldb/API/SBCommandInterpreter.h"
@@ -1144,31 +1145,137 @@ lldb::SBValue Variables::FindVariable(uint64_t variablesReference,
   return variable;
 }
 
-llvm::StringMap<bool> DAP::GetCapabilities() {
-  llvm::StringMap<bool> capabilities;
+static void mergeCapabilities(protocol::Capabilities &into,
+                              const protocol::Capabilities &from) {
+  if (from.supportsConfigurationDoneRequest)
+    into.supportsConfigurationDoneRequest =
+        *from.supportsConfigurationDoneRequest;
+  if (from.supportsFunctionBreakpoints)
+    into.supportsFunctionBreakpoints = *from.supportsFunctionBreakpoints;
+  if (from.supportsConditionalBreakpoints)
+    into.supportsConditionalBreakpoints = *from.supportsConditionalBreakpoints;
+  if (from.supportsHitConditionalBreakpoints)
+    into.supportsHitConditionalBreakpoints =
+        *from.supportsHitConditionalBreakpoints;
+  if (from.supportsEvaluateForHovers)
+    into.supportsEvaluateForHovers = *from.supportsEvaluateForHovers;
+  if (from.exceptionBreakpointFilters)
+    into.exceptionBreakpointFilters = *from.exceptionBreakpointFilters;
+  if (from.supportsStepBack)
+    into.supportsStepBack = *from.supportsStepBack;
+  if (from.supportsSetVariable)
+    into.supportsSetVariable = *from.supportsSetVariable;
+  if (from.supportsRestartFrame)
+    into.supportsRestartFrame = *from.supportsRestartFrame;
+  if (from.supportsGotoTargetsRequest)
+    into.supportsGotoTargetsRequest = *from.supportsGotoTargetsRequest;
+  if (from.supportsStepInTargetsRequest)
+    into.supportsStepInTargetsRequest = *from.supportsStepInTargetsRequest;
+  if (from.supportsCompletionsRequest)
+    into.supportsCompletionsRequest = *from.supportsCompletionsRequest;
+  if (from.completionTriggerCharacters)
+    into.completionTriggerCharacters = *from.completionTriggerCharacters;
+  if (from.supportsModulesRequest)
+    into.supportsModulesRequest = *from.supportsModulesRequest;
+  if (from.additionalModuleColumns)
+    into.additionalModuleColumns = *from.additionalModuleColumns;
+  if (from.supportedChecksumAlgorithms)
+    into.supportedChecksumAlgorithms = *from.supportedChecksumAlgorithms;
+  if (from.supportsRestartRequest)
+    into.supportsRestartRequest = *from.supportsRestartRequest;
+  if (from.supportsExceptionOptions)
+    into.supportsExceptionOptions = *from.supportsExceptionOptions;
+  if (from.supportsValueFormattingOptions)
+    into.supportsValueFormattingOptions = *from.supportsValueFormattingOptions;
+  if (from.supportsExceptionInfoRequest)
+    into.supportsExceptionInfoRequest = *from.supportsExceptionInfoRequest;
+  if (from.supportTerminateDebuggee)
+    into.supportTerminateDebuggee = *from.supportTerminateDebuggee;
+  if (from.supportSuspendDebuggee)
+    into.supportSuspendDebuggee = *from.supportSuspendDebuggee;
+  if (from.supportsDelayedStackTraceLoading)
+    into.supportsDelayedStackTraceLoading =
+        *from.supportsDelayedStackTraceLoading;
+  if (from.supportsLoadedSourcesRequest)
+    into.supportsLoadedSourcesRequest = *from.supportsLoadedSourcesRequest;
+  if (from.supportsLogPoints)
+    into.supportsLogPoints = *from.supportsLogPoints;
+  if (from.supportsTerminateThreadsRequest)
+    into.supportsTerminateThreadsRequest =
+        *from.supportsTerminateThreadsRequest;
+  if (from.supportsSetExpression)
+    into.supportsSetExpression = *from.supportsSetExpression;
+  if (from.supportsTerminateRequest)
+    into.supportsTerminateRequest = *from.supportsTerminateRequest;
+  if (from.supportsDataBreakpoints)
+    into.supportsDataBreakpoints = *from.supportsDataBreakpoints;
+  if (from.supportsReadMemoryRequest)
+    into.supportsReadMemoryRequest = *from.supportsReadMemoryRequest;
+  if (from.supportsWriteMemoryRequest)
+    into.supportsWriteMemoryRequest = *from.supportsWriteMemoryRequest;
+  if (from.supportsDisassembleRequest)
+    into.supportsDisassembleRequest = *from.supportsDisassembleRequest;
+  if (from.supportsCancelRequest)
+    into.supportsCancelRequest = *from.supportsCancelRequest;
+  if (from.supportsBreakpointLocationsRequest)
+    into.supportsBreakpointLocationsRequest =
+        *from.supportsBreakpointLocationsRequest;
+  if (from.supportsClipboardContext)
+    into.supportsClipboardContext = *from.supportsClipboardContext;
+  if (from.supportsSteppingGranularity)
+    into.supportsSteppingGranularity = *from.supportsSteppingGranularity;
+  if (from.supportsInstructionBreakpoints)
+    into.supportsInstructionBreakpoints = *from.supportsInstructionBreakpoints;
+  if (from.supportsExceptionFilterOptions)
+    into.supportsExceptionFilterOptions = *from.supportsExceptionFilterOptions;
+  if (from.supportsSingleThreadExecutionRequests)
+    into.supportsSingleThreadExecutionRequests =
+        *from.supportsSingleThreadExecutionRequests;
+  if (from.supportsDataBreakpointBytes)
+    into.supportsDataBreakpointBytes = *from.supportsDataBreakpointBytes;
+  if (from.breakpointModes)
+    into.breakpointModes = *from.breakpointModes;
+  if (from.supportsANSIStyling)
+    into.supportsANSIStyling = *from.supportsANSIStyling;
+}
+
+protocol::Capabilities DAP::GetCapabilities() {
+  protocol::Capabilities capabilities;
 
   // Supported capabilities.
-  capabilities["supportTerminateDebuggee"] = true;
-  capabilities["supportsDataBreakpoints"] = true;
-  capabilities["supportsDelayedStackTraceLoading"] = true;
-  capabilities["supportsEvaluateForHovers"] = true;
-  capabilities["supportsExceptionOptions"] = true;
-  capabilities["supportsLogPoints"] = true;
-  capabilities["supportsProgressReporting"] = true;
-  capabilities["supportsSteppingGranularity"] = true;
-  capabilities["supportsValueFormattingOptions"] = true;
+  capabilities.supportTerminateDebuggee = true;
+  capabilities.supportsDataBreakpoints = true;
+  capabilities.supportsDelayedStackTraceLoading = true;
+  capabilities.supportsEvaluateForHovers = true;
+  capabilities.supportsExceptionOptions = true;
+  capabilities.supportsLogPoints = true;
+  capabilities.supportsSteppingGranularity = true;
+  capabilities.supportsValueFormattingOptions = true;
 
   // Unsupported capabilities.
-  capabilities["supportsGotoTargetsRequest"] = false;
-  capabilities["supportsLoadedSourcesRequest"] = false;
-  capabilities["supportsRestartFrame"] = false;
-  capabilities["supportsStepBack"] = false;
+  capabilities.supportsGotoTargetsRequest = false;
+  capabilities.supportsLoadedSourcesRequest = false;
+  capabilities.supportsRestartFrame = false;
+  capabilities.supportsStepBack = false;
 
   // Capabilities associated with specific requests.
-  for (auto &kv : request_handlers) {
-    for (auto &request_kv : kv.second->GetCapabilities())
-      capabilities[request_kv.getKey()] = request_kv.getValue();
-  }
+  for (auto &kv : request_handlers)
+    mergeCapabilities(capabilities, kv.second->GetCapabilities());
+
+  // Available filters or options for the setExceptionBreakpoints request.
+  std::vector<protocol::ExceptionBreakpointsFilter> filters;
+  for (const auto &exc_bp : *exception_breakpoints)
+    filters.emplace_back(CreateExceptionBreakpointFilter(exc_bp));
+  capabilities.exceptionBreakpointFilters = std::move(filters);
+
+  std::vector<std::string> completion_characters;
+  completion_characters.emplace_back(".");
+  completion_characters.emplace_back(" ");
+  completion_characters.emplace_back("\t");
+  capabilities.completionTriggerCharacters = std::move(completion_characters);
+
+  // Put in non-DAP specification lldb specific information.
+  capabilities.lldbVersion = debugger.GetVersionString();
 
   return capabilities;
 }
diff --git a/lldb/tools/lldb-dap/DAP.h b/lldb/tools/lldb-dap/DAP.h
index 4b4d471161137..2f23e5a116bc3 100644
--- a/lldb/tools/lldb-dap/DAP.h
+++ b/lldb/tools/lldb-dap/DAP.h
@@ -16,6 +16,7 @@
 #include "OutputRedirector.h"
 #include "ProgressEvent.h"
 #include "Protocol/ProtocolBase.h"
+#include "Protocol/ProtocolTypes.h"
 #include "SourceBreakpoint.h"
 #include "Transport.h"
 #include "lldb/API/SBBroadcaster.h"
@@ -180,6 +181,7 @@ struct DAP {
   bool enable_auto_variable_summaries;
   bool enable_synthetic_child_debugging;
   bool display_extended_backtrace;
+  bool supports_run_in_terminal_request;
   // The process event thread normally responds to process exited events by
   // shutting down the entire adapter. When we're restarting, we keep the id of
   // the old process here so we can detect this case and keep running.
@@ -363,8 +365,8 @@ struct DAP {
     request_handlers[Handler::GetCommand()] = std::make_unique<Handler>(*this);
   }
 
-  /// Return a key-value list of capabilities.
-  llvm::StringMap<bool> GetCapabilities();
+  /// The set of capablities supported by this adapter.
+  protocol::Capabilities GetCapabilities();
 
   /// Debuggee will continue from stopped state.
   void WillContinue() { variables.Clear(); }
diff --git a/lldb/tools/lldb-dap/Handler/InitializeRequestHandler.cpp b/lldb/tools/lldb-dap/Handler/InitializeRequestHandler.cpp
index a8fe0d6ffce8b..b85424975a0fc 100644
--- a/lldb/tools/lldb-dap/Handler/InitializeRequestHandler.cpp
+++ b/lldb/tools/lldb-dap/Handler/InitializeRequestHandler.cpp
@@ -9,6 +9,7 @@
 #include "DAP.h"
 #include "EventHelper.h"
 #include "JSONUtils.h"
+#include "Protocol/ProtocolRequests.h"
 #include "RequestHandler.h"
 #include "lldb/API/SBEvent.h"
 #include "lldb/API/SBListener.h"
@@ -229,118 +230,29 @@ static void EventThreadFunction(DAP &dap) {
   }
 }
 
-// "InitializeRequest": {
-//   "allOf": [ { "$ref": "#/definitions/Request" }, {
-//     "type": "object",
-//     "description": "Initialize request; value of command field is
-//                     'initialize'.",
-//     "properties": {
-//       "command": {
-//         "type": "string",
-//         "enum": [ "initialize" ]
-//       },
-//       "arguments": {
-//         "$ref": "#/definitions/InitializeRequestArguments"
-//       }
-//     },
-//     "required": [ "command", "arguments" ]
-//   }]
-// },
-// "InitializeRequestArguments": {
-//   "type": "object",
-//   "description": "Arguments for 'initialize' request.",
-//   "properties": {
-//     "clientID": {
-//       "type": "string",
-//       "description": "The ID of the (frontend) client using this adapter."
-//     },
-//     "adapterID": {
-//       "type": "string",
-//       "description": "The ID of the debug adapter."
-//     },
-//     "locale": {
-//       "type": "string",
-//       "description": "The ISO-639 locale of the (frontend) client using
-//                       this adapter, e.g. en-US or de-CH."
-//     },
-//     "linesStartAt1": {
-//       "type": "boolean",
-//       "description": "If true all line numbers are 1-based (default)."
-//     },
-//     "columnsStartAt1": {
-//       "type": "boolean",
-//       "description": "If true all column numbers are 1-based (default)."
-//     },
-//     "pathFormat": {
-//       "type": "string",
-//       "_enum": [ "path", "uri" ],
-//       "description": "Determines in what format paths are specified. The
-//                       default is 'path', which is the native format."
-//     },
-//     "supportsVariableType": {
-//       "type": "boolean",
-//       "description": "Client supports the optional type attribute for
-//                       variables."
-//     },
-//     "supportsVariablePaging": {
-//       "type": "boolean",
-//       "description": "Client supports the paging of variables."
-//     },
-//     "supportsRunInTerminalRequest": {
-//       "type": "boolean",
-//       "description": "Client supports the runInTerminal request."
-//     }
-//   },
-//   "required": [ "adapterID" ]
-// },
-// "InitializeResponse": {
-//   "allOf": [ { "$ref": "#/definitions/Response" }, {
-//     "type": "object",
-//     "description": "Response to 'initialize' request.",
-//     "properties": {
-//       "body": {
-//         "$ref": "#/definitions/Capabilities",
-//         "description": "The capabilities of this debug adapter."
-//       }
-//     }
-//   }]
-// }
-void InitializeRequestHandler::operator()(
-    const llvm::json::Object &request) const {
-  llvm::json::Object response;
-  FillResponse(request, response);
-  llvm::json::Object body;
-
-  const auto *arguments = request.getObject("arguments");
-  // sourceInitFile option is not from formal DAP specification. It is only
-  // used by unit tests to prevent sourcing .lldbinit files from environment
-  // which may affect the outcome of tests.
-  bool source_init_file =
-      GetBoolean(arguments, "sourceInitFile").value_or(true);
-
+/// Initialize request; value of command field is 'initialize'.
+llvm::Expected<protocol::InitializeResponseBody> InitializeRequestHandler::Run(
+    const protocol::InitializeRequestArguments &arguments) const {
   // Do not source init files until in/out/err are configured.
   dap.debugger = lldb::SBDebugger::Create(false);
   dap.debugger.SetInputFile(dap.in);
-  auto out_fd = dap.out.GetWriteFileDescriptor();
-  if (llvm::Error err = out_fd.takeError()) {
-    response["success"] = false;
-    EmplaceSafeString(response, "message", llvm::toString(std::move(err)));
-    dap.SendJSON(llvm::json::Value(std::move(response)));
-    return;
-  }
+
+  llvm::Expected<int> out_fd = dap.out.GetWriteFileDescriptor();
+  if (!out_fd)
+    return out_fd.takeError();
   dap.debugger.SetOutputFile(lldb::SBFile(*out_fd, "w", false));
-  auto err_fd = dap.err.GetWriteFileDescriptor();
-  if (llvm::Error err = err_fd.takeError()) {
-    response["success"] = false;
-    EmplaceSafeString(response, "message", llvm::toString(std::move(err)));
-    dap.SendJSON(llvm::json::Value(std::move(response)));
-    return;
-  }
+
+  llvm::Expected<int> err_fd = dap.err.GetWriteFileDescriptor();
+  if (!err_fd)
+    return err_fd.takeError();
   dap.debugger.SetErrorFile(lldb::SBFile(*err_fd, "w", false));
 
   auto interp = dap.debugger.GetCommandInterpreter();
 
-  if (source_init_file) {
+  // sourceInitFile option is not from formal DAP specification. It is only
+  // used by unit tests to prevent sourcing .lldbinit files from environment
+  // which may affect the outcome of tests.
+  if (arguments.sourceInitFile.value_or(true)) {
     dap.debugger.SkipLLDBInitFiles(false);
     dap.debugger.SkipAppInitFiles(false);
     lldb::SBCommandReturnObject init;
@@ -348,59 +260,35 @@ void InitializeRequestHandler::operator()(
     interp.SourceInitFileInHomeDirectory(init);
   }
 
-  if (llvm::Error err = dap.RunPreInitCommands()) {
-    response["success"] = false;
-    EmplaceSafeString(response, "message", llvm::toString(std::move(err)));
-    dap.SendJSON(llvm::json::Value(std::move(response)));
-    return;
-  }
+  if (llvm::Error err = dap.RunPreInitCommands())
+    return err;
 
   dap.PopulateExceptionBreakpoints();
   auto cmd = dap.debugger.GetCommandInterpreter().AddMultiwordCommand(
       "lldb-dap", "Commands for managing lldb-dap.");
-  if (GetBoolean(arguments, "supportsStartDebuggingRequest").value_or(false)) {
+  if (arguments.supportsStartDebuggingRequest.value_or(false)) {
     cmd.AddCommand(
         "start-debugging", new StartDebuggingRequestHandler(dap),
         "Sends a startDebugging request from the debug adapter to the client "
         "to start a child debug session of the same type as the caller.");
   }
+  dap.supports_run_in_terminal_request =
+      arguments.supportsRunInTerminalRequest.value_or(false);
   cmd.AddCommand(
       "repl-mode", new ReplModeRequestHandler(dap),
       "Get or set the repl behavior of lldb-dap evaluation requests.");
   cmd.AddCommand("send-event", new SendEventRequestHandler(dap),
                  "Sends an DAP event to the client.");
 
-  dap.progress_event_thread =
-      std::thread(ProgressEventThreadFunction, std::ref(dap));
+  if (arguments.supportsProgressReporting)
+    dap.progress_event_thread =
+        std::thread(ProgressEventThreadFunction, std::ref(dap));
 
   // Start our event thread so we can receive events from the debugger, target,
   // process and more.
   dap.event_thread = std::thread(EventThreadFunction, std::ref(dap));
 
-  llvm::StringMap<bool> capabilities = dap.GetCapabilities();
-  for (auto &kv : capabilities)
-    body.try_emplace(kv.getKey(), kv.getValue());
-
-  // Available filters or options for the setExceptionBreakpoints request.
-  llvm::json::Array filters;
-  for (const auto &exc_bp : *dap.exception_breakpoints)
-    filters.emplace_back(CreateExceptionBreakpointFilter(exc_bp));
-  body.try_emplace("exceptionBreakpointFilters", std::move(filters));
-
-  llvm::json::Array completion_characters;
-  completion_characters.emplace_back(".");
-  completion_characters.emplace_back(" ");
-  completion_characters.emplace_back("\t");
-  body.try_emplace("completionTriggerCharacters",
-                   std::move(completion_characters));
-
-  // Put in non-DAP specification lldb specific information.
-  llvm::json::Object lldb_json;
-  lldb_json.try_emplace("version", dap.debugger.GetVersionString());
-  body.try_emplace("__lldb", std::move(lldb_json));
-
-  response.try_emplace("body", std::move(body));
-  dap.SendJSON(llvm::json::Value(std::move(response)));
+  return dap.GetCapabilities();
 }
 
 } // namespace lldb_dap
diff --git a/lldb/tools/lldb-dap/Handler/RequestHandler.cpp b/lldb/tools/lldb-dap/Handler/RequestHandler.cpp
index 60c82649938d6..d2a0da420739e 100644
--- a/lldb/tools/lldb-dap/Handler/RequestHandler.cpp
+++ b/lldb/tools/lldb-dap/Handler/RequestHandler.cpp
@@ -201,6 +201,7 @@ BaseRequestHandler::LaunchProcess(const llvm::json::Object &request) const {
   const auto timeout_seconds =
       GetInteger<uint64_t>(arguments, "timeout").value_or(30);
 
+  // FIXME: Check dap.supports_run_in_terminal_request.
   if (GetBoolean(arguments, "runInTerminal").value_or(false)) {
     if (llvm::Error err = RunInTerminal(dap, request, timeout_seconds))
       error.SetErrorString(llvm::toString(std::move(err)).c_str());
diff --git a/lldb/tools/lldb-dap/Handler/RequestHandler.h b/lldb/tools/lldb-dap/Handler/RequestHandler.h
index 8971b02fcb92e..ba854c9884cde 100644
--- a/lldb/tools/lldb-dap/Handler/RequestHandler.h
+++ b/lldb/tools/lldb-dap/Handler/RequestHandler.h
@@ -14,6 +14,7 @@
 #include "DAPLog.h"
 #include "Protocol/ProtocolBase.h"
 #include "Protocol/ProtocolRequests.h"
+#include "Protocol/ProtocolTypes.h"
 #include "lldb/API/SBError.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Error.h"
@@ -47,7 +48,7 @@ class BaseRequestHandler {
 
   virtual void operator()(const protocol::Request &request) const = 0;
 
-  virtual llvm::StringMap<bool> GetCapabilities() const { return {}; }
+  virtual protocol::Capabilities GetCapabilities() const { return {}; }
 
 protected:
   /// Helpers used by multiple request handlers.
@@ -175,8 +176,10 @@ class BreakpointLocationsRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "breakpointLocations"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsBreakpointLocationsRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsBreakpointLocationsRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -185,8 +188,10 @@ class CompletionsRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "completions"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsCompletionsRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsCompletionsRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -202,8 +207,10 @@ class ConfigurationDoneRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "configurationDone"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsConfigurationDoneRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsConfigurationDoneRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -229,20 +236,22 @@ class ExceptionInfoRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "exceptionInfo"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsExceptionInfoRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsExceptionInfoRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
 
-class InitializeRequestHandler : public LegacyRequestHandler {
+class InitializeRequestHandler
+    : public RequestHandler<protocol::InitializeRequestArguments,
+                            protocol::InitializeResponseBody> {
 public:
-  using LegacyRequestHandler::LegacyRequestHandler;
+  using RequestHandler::RequestHandler;
   static llvm::StringLiteral GetCommand() { return "initialize"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsRunInTerminalRequest", true}};
-  }
-  void operator()(const llvm::json::Object &request) const override;
+  llvm::Expected<protocol::InitializeResponseBody>
+  Run(const protocol::InitializeRequestArguments &args) const override;
 };
 
 class LaunchRequestHandler : public LegacyRequestHandler {
@@ -256,8 +265,10 @@ class RestartRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "restart"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsRestartRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsRestartRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -280,8 +291,10 @@ class StepInTargetsRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "stepInTargets"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsStepInTargetsRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsStepInTargetsRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -297,9 +310,11 @@ class SetBreakpointsRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "setBreakpoints"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsConditionalBreakpoints", true},
-            {"supportsHitConditionalBreakpoints", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsConditionalBreakpoints = true;
+    capabilities.supportsHitConditionalBreakpoints = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -315,8 +330,10 @@ class SetFunctionBreakpointsRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "setFunctionBreakpoints"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsFunctionBreakpoints", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsFunctionBreakpoints = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -355,8 +372,10 @@ class ModulesRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "modules"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsModulesRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsModulesRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -379,8 +398,10 @@ class SetVariableRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "setVariable"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsSetVariable", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsSetVariable = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -427,8 +448,10 @@ class DisassembleRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "disassemble"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsDisassembleRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsDisassembleRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
@@ -437,8 +460,10 @@ class ReadMemoryRequestHandler : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "readMemory"; }
-  llvm::StringMap<bool> GetCapabilities() const override {
-    return {{"supportsReadMemoryRequest", true}};
+  protocol::Capabilities GetCapabilities() const override {
+    protocol::Capabilities capabilities;
+    capabilities.supportsReadMemoryRequest = true;
+    return capabilities;
   }
   void operator()(const llvm::json::Object &request) const override;
 };
diff --git a/lldb/tools/lldb-dap/JSONUtils.cpp b/lldb/tools/lldb-dap/JSONUtils.cpp
index ea942c5d65934..9773b91a35a45 100644
--- a/lldb/tools/lldb-dap/JSONUtils.cpp
+++ b/lldb/tools/lldb-dap/JSONUtils.cpp
@@ -557,35 +557,13 @@ llvm::json::Object CreateEventObject(const llvm::StringRef event_name) {
   return event;
 }
 
-// "ExceptionBreakpointsFilter": {
-//   "type": "object",
-//   "description": "An ExceptionBreakpointsFilter is shown in the UI as an
-//                   option for configuring how exceptions are dealt with.",
-//   "properties": {
-//     "filter": {
-//       "type": "string",
-//       "description": "The internal ID of the filter. This value is passed
-//                       to the setExceptionBreakpoints request."
-//     },
-//     "label": {
-//       "type": "string",
-//       "description": "The name of the filter. This will be shown in the UI."
-//     },
-//     "default": {
-//       "type": "boolean",
-//       "description": "Initial value of the filter. If not specified a value
-//                       'false' is assumed."
-//     }
-//   },
-//   "required": [ "filter", "label" ]
-// }
-llvm::json::Value
+protocol::ExceptionBreakpointsFilter
 CreateExceptionBreakpointFilter(const ExceptionBreakpoint &bp) {
-  llvm::json::Object object;
-  EmplaceSafeString(object, "filter", bp.filter);
-  EmplaceSafeString(object, "label", bp.label);
-  object.try_emplace("default", bp.default_value);
-  return llvm::json::Value(std::move(object));
+  protocol::ExceptionBreakpointsFilter filter;
+  filter.filter = bp.filter;
+  filter.label = bp.label;
+  filter.defaultState = bp.default_value;
+  return filter;
 }
 
 // "Source": {
diff --git a/lldb/tools/lldb-dap/JSONUtils.h b/lldb/tools/lldb-dap/JSONUtils.h
index a8858020f7d85..5d403d39a76d4 100644
--- a/lldb/tools/lldb-dap/JSONUtils.h
+++ b/lldb/tools/lldb-dap/JSONUtils.h
@@ -10,6 +10,7 @@
 #define LLDB_TOOLS_LLDB_DAP_JSONUTILS_H
 
 #include "DAPForward.h"
+#include "Protocol/ProtocolTypes.h"
 #include "lldb/API/SBCompileUnit.h"
 #include "lldb/API/SBFileSpec.h"
 #include "lldb/API/SBFormat.h"
@@ -289,7 +290,7 @@ llvm::json::Object CreateEventObject(const llvm::StringRef event_name);
 /// \return
 ///     A "ExceptionBreakpointsFilter" JSON object with that follows
 ///     the formal JSON definition outlined by Microsoft.
-llvm::json::Value
+protocol::ExceptionBreakpointsFilter
 CreateExceptionBreakpointFilter(const ExceptionBreakpoint &bp);
 
 /// Create a "Scope" JSON object as described in the debug adapter definition.
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp
index 5cc5429227439..16d54b1184f1d 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp
@@ -23,6 +23,58 @@ bool fromJSON(const json::Value &Params, DisconnectArguments &DA,
          O.mapOptional("suspendDebuggee", DA.suspendDebuggee);
 }
 
+bool fromJSON(const llvm::json::Value &Params,
+              InitializeRequestArguments::PathFormat &PF, llvm::json::Path P) {
+  auto rawPathFormat = Params.getAsString();
+  if (!rawPathFormat) {
+    P.report("expected a string");
+    return false;
+  }
+
+  std::optional<InitializeRequestArguments::PathFormat> pathFormat =
+      StringSwitch<std::optional<InitializeRequestArguments::PathFormat>>(
+          *rawPathFormat)
+          .Case("path", InitializeRequestArguments::PathFormat::path)
+          .Case("uri", InitializeRequestArguments::PathFormat::uri)
+          .Default(std::nullopt);
+  if (!pathFormat) {
+    P.report("unexpected value, expected 'path' or 'uri'");
+    return false;
+  }
+
+  PF = *pathFormat;
+  return true;
+}
+
+bool fromJSON(const llvm::json::Value &Params, InitializeRequestArguments &IRA,
+              llvm::json::Path P) {
+  json::ObjectMapper O(Params, P);
+  return O && O.mapOptional("adatperID", IRA.adatperID) &&
+         O.mapOptional("clientID", IRA.clientID) &&
+         O.mapOptional("clientName", IRA.clientName) &&
+         O.mapOptional("locale", IRA.locale) &&
+         O.mapOptional("linesStartAt1", IRA.linesStartAt1) &&
+         O.mapOptional("columnsStartAt1", IRA.columnsStartAt1) &&
+         O.mapOptional("pathFormat", IRA.pathFormat) &&
+         O.mapOptional("supportsVariableType", IRA.supportsVariableType) &&
+         O.mapOptional("supportsVariablePaging", IRA.supportsVariablePaging) &&
+         O.mapOptional("supportsRunInTerminalRequest",
+                       IRA.supportsRunInTerminalRequest) &&
+         O.mapOptional("supportsMemoryReferences",
+                       IRA.supportsMemoryReferences) &&
+         O.mapOptional("supportsProgressReporting",
+                       IRA.supportsProgressReporting) &&
+         O.mapOptional("supportsInvalidatedEvent",
+                       IRA.supportsInvalidatedEvent) &&
+         O.mapOptional("supportsMemoryEvent", IRA.supportsMemoryEvent) &&
+         O.mapOptional("supportsArgsCanBeInterpretedByShell",
+                       IRA.supportsArgsCanBeInterpretedByShell) &&
+         O.mapOptional("supportsStartDebuggingRequest",
+                       IRA.supportsStartDebuggingRequest) &&
+         O.mapOptional("supportsANSIStyling", IRA.supportsANSIStyling) &&
+         O.mapOptional("$__lldb_sourceInitFile", IRA.sourceInitFile);
+}
+
 bool fromJSON(const json::Value &Params, SourceArguments &SA, json::Path P) {
   json::ObjectMapper O(Params, P);
   return O && O.mapOptional("source", SA.source) &&
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h
index 5dc4a589178d2..beb573515df62 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h
@@ -54,6 +54,75 @@ bool fromJSON(const llvm::json::Value &, DisconnectArguments &,
 /// body field is required.
 using DisconnectResponse = VoidResponse;
 
+/// Arguments for `initialize` request.
+struct InitializeRequestArguments {
+  /// The ID of the debug adapter.
+  std::string adatperID;
+
+  /// The ID of the client using this adapter.
+  std::optional<std::string> clientID;
+
+  /// The human-readable name of the client using this adapter.
+  std::optional<std::string> clientName;
+
+  /// The ISO-639 locale of the client using this adapter, e.g. en-US or de-CH.
+  std::optional<std::string> locale;
+
+  /// If true all line numbers are 1-based (default).
+  std::optional<bool> linesStartAt1;
+
+  /// If true all column numbers are 1-based (default).
+  std::optional<bool> columnsStartAt1;
+
+  enum class PathFormat { path, uri };
+
+  /// Determines in what format paths are specified. The default is `path`,
+  /// which is the native format.
+  std::optional<PathFormat> pathFormat = PathFormat::path;
+
+  /// Client supports the `type` attribute for variables.
+  std::optional<bool> supportsVariableType;
+
+  /// Client supports the paging of variables.
+  std::optional<bool> supportsVariablePaging;
+
+  /// Client supports the `runInTerminal` request.
+  std::optional<bool> supportsRunInTerminalRequest;
+
+  /// Client supports memory references.
+  std::optional<bool> supportsMemoryReferences;
+
+  /// Client supports progress reporting.
+  std::optional<bool> supportsProgressReporting;
+
+  /// Client supports the `invalidated` event.
+  std::optional<bool> supportsInvalidatedEvent;
+
+  /// Client supports the `memory` event.
+  std::optional<bool> supportsMemoryEvent;
+
+  /// Client supports the `argsCanBeInterpretedByShell` attribute on the
+  /// `runInTerminal` request.
+  std::optional<bool> supportsArgsCanBeInterpretedByShell;
+
+  /// Client supports the `startDebugging` request.
+  std::optional<bool> supportsStartDebuggingRequest;
+
+  /// The client will interpret ANSI escape sequences in the display of
+  /// `OutputEvent.output` and `Variable.value` fields when
+  /// `Capabilities.supportsANSIStyling` is also enabled.
+  std::optional<bool> supportsANSIStyling;
+
+  /// lldb-dap Extensions
+  /// Source init files when initializing lldb::SBDebugger.
+  std::optional<bool> sourceInitFile;
+};
+bool fromJSON(const llvm::json::Value &, InitializeRequestArguments &,
+              llvm::json::Path);
+
+/// Response to `initialize` request. The capabilities of this debug adapter.
+using InitializeResponseBody = std::optional<Capabilities>;
+
 /// Arguments for `source` request.
 struct SourceArguments {
   /// Specifies the source content to load. Either `source.path` or
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
index efb5c3abe32bf..d81d4bc801538 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
@@ -44,4 +44,203 @@ bool fromJSON(const json::Value &Params, Source &S, json::Path P) {
          O.mapOptional("sourceReference", S.sourceReference);
 }
 
+json::Value toJSON(const ExceptionBreakpointsFilter &EBF) {
+  json::Object result{{"filter", EBF.filter}, {"label", EBF.label}};
+
+  if (EBF.description)
+    result.insert({"description", *EBF.description});
+  if (EBF.defaultState)
+    result.insert({"defaultState", *EBF.defaultState});
+  if (EBF.supportsCondition)
+    result.insert({"supportsCondition", *EBF.supportsCondition});
+  if (EBF.conditionDescription)
+    result.insert({"conditionDescription", *EBF.conditionDescription});
+
+  return result;
+}
+
+json::Value toJSON(const ColumnDescriptor::Type &T) {
+  switch (T) {
+  case ColumnDescriptor::Type::String:
+    return "string";
+  case ColumnDescriptor::Type::Number:
+    return "number";
+  case ColumnDescriptor::Type::Boolean:
+    return "boolean";
+  case ColumnDescriptor::Type::Timestamp:
+    return "unixTimestampUTC";
+  }
+}
+
+json::Value toJSON(const ColumnDescriptor &CD) {
+  json::Object result{{"attributeName", CD.attributeName}, {"label", CD.label}};
+
+  if (CD.format)
+    result.insert({"format", *CD.format});
+  if (CD.type)
+    result.insert({"type", *CD.type});
+  if (CD.width)
+    result.insert({"width", *CD.width});
+
+  return result;
+}
+
+json::Value toJSON(const ChecksumAlgorithm &CA) {
+  switch (CA) {
+  case ChecksumAlgorithm::md5:
+    return "MD5";
+  case ChecksumAlgorithm::sha1:
+    return "SHA1";
+  case ChecksumAlgorithm::sha256:
+    return "SHA256";
+  case ChecksumAlgorithm::timestamp:
+    return "timestamp";
+  }
+}
+
+json::Value toJSON(const BreakpointModeApplicability &BMA) {
+  switch (BMA) {
+  case BreakpointModeApplicability::source:
+    return "source";
+  case BreakpointModeApplicability::exception:
+    return "exception";
+  case BreakpointModeApplicability::data:
+    return "data";
+  case BreakpointModeApplicability::instruction:
+    return "instruction";
+  }
+}
+
+json::Value toJSON(const BreakpointMode &BM) {
+  json::Object result{
+      {"mode", BM.mode},
+      {"label", BM.label},
+      {"appliesTo", BM.appliesTo},
+  };
+
+  if (BM.description)
+    result.insert({"description", *BM.description});
+
+  return result;
+}
+
+json::Value toJSON(const Capabilities &C) {
+  json::Object result;
+
+  if (C.supportsConfigurationDoneRequest && *C.supportsConfigurationDoneRequest)
+    result.insert({"supportsConfigurationDoneRequest",
+                   *C.supportsConfigurationDoneRequest});
+  if (C.supportsFunctionBreakpoints && *C.supportsFunctionBreakpoints)
+    result.insert(
+        {"supportsFunctionBreakpoints", *C.supportsFunctionBreakpoints});
+  if (C.supportsConditionalBreakpoints && *C.supportsConditionalBreakpoints)
+    result.insert(
+        {"supportsConditionalBreakpoints", *C.supportsConditionalBreakpoints});
+  if (C.supportsHitConditionalBreakpoints &&
+      *C.supportsHitConditionalBreakpoints)
+    result.insert({"supportsHitConditionalBreakpoints",
+                   *C.supportsHitConditionalBreakpoints});
+  if (C.supportsEvaluateForHovers && *C.supportsEvaluateForHovers)
+    result.insert({"supportsEvaluateForHovers", *C.supportsEvaluateForHovers});
+  if (C.exceptionBreakpointFilters && !C.exceptionBreakpointFilters->empty())
+    result.insert(
+        {"exceptionBreakpointFilters", *C.exceptionBreakpointFilters});
+  if (C.supportsStepBack && *C.supportsStepBack)
+    result.insert({"supportsStepBack", *C.supportsStepBack});
+  if (C.supportsSetVariable && *C.supportsSetVariable)
+    result.insert({"supportsSetVariable", *C.supportsSetVariable});
+  if (C.supportsRestartFrame && *C.supportsRestartFrame)
+    result.insert({"supportsRestartFrame", *C.supportsRestartFrame});
+  if (C.supportsGotoTargetsRequest && *C.supportsGotoTargetsRequest)
+    result.insert(
+        {"supportsGotoTargetsRequest", *C.supportsGotoTargetsRequest});
+  if (C.supportsStepInTargetsRequest && *C.supportsStepInTargetsRequest)
+    result.insert(
+        {"supportsStepInTargetsRequest", *C.supportsStepInTargetsRequest});
+  if (C.supportsCompletionsRequest && *C.supportsCompletionsRequest)
+    result.insert(
+        {"supportsCompletionsRequest", *C.supportsCompletionsRequest});
+  if (C.completionTriggerCharacters && !C.completionTriggerCharacters->empty())
+    result.insert(
+        {"completionTriggerCharacters", *C.completionTriggerCharacters});
+  if (C.supportsModulesRequest && *C.supportsModulesRequest)
+    result.insert({"supportsModulesRequest", *C.supportsModulesRequest});
+  if (C.additionalModuleColumns && !C.additionalModuleColumns->empty())
+    result.insert({"additionalModuleColumns", *C.additionalModuleColumns});
+  if (C.supportedChecksumAlgorithms && !C.supportedChecksumAlgorithms->empty())
+    result.insert(
+        {"supportedChecksumAlgorithms", *C.supportedChecksumAlgorithms});
+  if (C.supportsRestartRequest && *C.supportsRestartRequest)
+    result.insert({"supportsRestartRequest", *C.supportsRestartRequest});
+  if (C.supportsExceptionOptions && *C.supportsExceptionOptions)
+    result.insert({"supportsExceptionOptions", *C.supportsExceptionOptions});
+  if (C.supportsValueFormattingOptions && *C.supportsValueFormattingOptions)
+    result.insert(
+        {"supportsValueFormattingOptions", *C.supportsValueFormattingOptions});
+  if (C.supportsExceptionInfoRequest && *C.supportsExceptionInfoRequest)
+    result.insert(
+        {"supportsExceptionInfoRequest", *C.supportsExceptionInfoRequest});
+  if (C.supportTerminateDebuggee && *C.supportTerminateDebuggee)
+    result.insert({"supportTerminateDebuggee", *C.supportTerminateDebuggee});
+  if (C.supportSuspendDebuggee && *C.supportSuspendDebuggee)
+    result.insert({"supportSuspendDebuggee", *C.supportSuspendDebuggee});
+  if (C.supportsDelayedStackTraceLoading && *C.supportsDelayedStackTraceLoading)
+    result.insert({"supportsDelayedStackTraceLoading",
+                   *C.supportsDelayedStackTraceLoading});
+  if (C.supportsLoadedSourcesRequest && *C.supportsLoadedSourcesRequest)
+    result.insert(
+        {"supportsLoadedSourcesRequest", *C.supportsLoadedSourcesRequest});
+  if (C.supportsLogPoints && *C.supportsLogPoints)
+    result.insert({"supportsLogPoints", *C.supportsLogPoints});
+  if (C.supportsTerminateThreadsRequest && *C.supportsTerminateThreadsRequest)
+    result.insert({"supportsTerminateThreadsRequest",
+                   *C.supportsTerminateThreadsRequest});
+  if (C.supportsSetExpression && *C.supportsSetExpression)
+    result.insert({"supportsSetExpression", *C.supportsSetExpression});
+  if (C.supportsTerminateRequest && *C.supportsTerminateRequest)
+    result.insert({"supportsTerminateRequest", *C.supportsTerminateRequest});
+  if (C.supportsDataBreakpoints && *C.supportsDataBreakpoints)
+    result.insert({"supportsDataBreakpoints", *C.supportsDataBreakpoints});
+  if (C.supportsReadMemoryRequest && *C.supportsReadMemoryRequest)
+    result.insert({"supportsReadMemoryRequest", *C.supportsReadMemoryRequest});
+  if (C.supportsWriteMemoryRequest && *C.supportsWriteMemoryRequest)
+    result.insert(
+        {"supportsWriteMemoryRequest", *C.supportsWriteMemoryRequest});
+  if (C.supportsDisassembleRequest && *C.supportsDisassembleRequest)
+    result.insert(
+        {"supportsDisassembleRequest", *C.supportsDisassembleRequest});
+  if (C.supportsCancelRequest && *C.supportsCancelRequest)
+    result.insert({"supportsCancelRequest", *C.supportsCancelRequest});
+  if (C.supportsBreakpointLocationsRequest &&
+      *C.supportsBreakpointLocationsRequest)
+    result.insert({"supportsBreakpointLocationsRequest",
+                   *C.supportsBreakpointLocationsRequest});
+  if (C.supportsClipboardContext && *C.supportsClipboardContext)
+    result.insert({"supportsClipboardContext", *C.supportsClipboardContext});
+  if (C.supportsSteppingGranularity && *C.supportsSteppingGranularity)
+    result.insert(
+        {"supportsSteppingGranularity", *C.supportsSteppingGranularity});
+  if (C.supportsInstructionBreakpoints && *C.supportsInstructionBreakpoints)
+    result.insert(
+        {"supportsInstructionBreakpoints", *C.supportsInstructionBreakpoints});
+  if (C.supportsExceptionFilterOptions && *C.supportsExceptionFilterOptions)
+    result.insert(
+        {"supportsExceptionFilterOptions", *C.supportsExceptionFilterOptions});
+  if (C.supportsSingleThreadExecutionRequests &&
+      *C.supportsSingleThreadExecutionRequests)
+    result.insert({"supportsSingleThreadExecutionRequests",
+                   *C.supportsSingleThreadExecutionRequests});
+  if (C.supportsDataBreakpointBytes && *C.supportsDataBreakpointBytes)
+    result.insert(
+        {"supportsDataBreakpointBytes", *C.supportsDataBreakpointBytes});
+  if (C.breakpointModes && !C.breakpointModes->empty())
+    result.insert({"breakpointModes", *C.breakpointModes});
+  if (C.supportsANSIStyling && *C.supportsANSIStyling)
+    result.insert({"supportsANSIStyling", *C.supportsANSIStyling});
+  if (C.lldbVersion && !C.lldbVersion->empty())
+    result.insert({"$__lldb_version", *C.lldbVersion});
+
+  return result;
+}
+
 } // namespace lldb_dap::protocol
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
index b54d76cb29a77..9a58e83b39ad1 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
@@ -27,6 +27,261 @@
 
 namespace lldb_dap::protocol {
 
+/// An `ExceptionBreakpointsFilter` is shown in the UI as an filter option for
+/// configuring how exceptions are dealt with.
+struct ExceptionBreakpointsFilter {
+  /// The internal ID of the filter option. This value is passed to the
+  /// `setExceptionBreakpoints` request.
+  std::string filter;
+
+  /// The name of the filter option. This is shown in the UI.
+  std::string label;
+
+  /// A help text providing additional information about the exception filter.
+  /// This string is typically shown as a hover and can be translated.
+  std::optional<std::string> description;
+
+  /// Initial value of the filter option. If not specified a value false is
+  /// assumed.
+  std::optional<bool> defaultState;
+
+  /// Controls whether a condition can be specified for this filter option. If
+  /// false or missing, a condition can not be set.
+  std::optional<bool> supportsCondition;
+
+  /// A help text providing information about the condition. This string is
+  /// shown as the placeholder text for a text box and can be translated.
+  std::optional<std::string> conditionDescription;
+};
+llvm::json::Value toJSON(const ExceptionBreakpointsFilter &);
+
+/// A ColumnDescriptor specifies what module attribute to show in a column of
+/// the modules view, how to format it, and what the column’s label should be.
+///
+/// It is only used if the underlying UI actually supports this level of
+/// customization.
+struct ColumnDescriptor {
+  /// Name of the attribute rendered in this column.
+  std::string attributeName;
+
+  /// Header UI label of column.
+  std::string label;
+
+  /// Format to use for the rendered values in this column. TBD how the format
+  /// strings looks like.
+  std::optional<std::string> format;
+
+  enum class Type { String, Number, Boolean, Timestamp };
+
+  /// Datatype of values in this column. Defaults to `string` if not specified.
+  /// Values: 'string', 'number', 'boolean', 'unixTimestampUTC'.
+  std::optional<Type> type;
+
+  /// Width of this column in characters (hint only).
+  std::optional<int> width;
+};
+llvm::json::Value toJSON(const ColumnDescriptor &);
+
+/// Names of checksum algorithms that may be supported by a debug adapter.
+/// Values: ‘MD5’, ‘SHA1’, ‘SHA256’, ‘timestamp’.
+enum class ChecksumAlgorithm { md5, sha1, sha256, timestamp };
+llvm::json::Value toJSON(const ChecksumAlgorithm &);
+
+/// Describes one or more type of breakpoint a BreakpointMode applies to. This
+/// is a non-exhaustive enumeration and may expand as future breakpoint types
+/// are added.
+enum class BreakpointModeApplicability {
+  /// In `SourceBreakpoint`'s.
+  source,
+  /// In exception breakpoints applied in the `ExceptionFilterOptions`.
+  exception,
+  /// In data breakpoints requested in the `DataBreakpointInfo` request.
+  data,
+  /// In `InstructionBreakpoint`'s.
+  instruction
+};
+llvm::json::Value toJSON(const BreakpointModeApplicability &);
+
+/// A `BreakpointMode` is provided as a option when setting breakpoints on
+/// sources or instructions.
+struct BreakpointMode {
+  /// The internal ID of the mode. This value is passed to the `setBreakpoints`
+  /// request.
+  std::string mode;
+
+  /// The name of the breakpoint mode. This is shown in the UI.
+  std::string label;
+
+  /// A help text providing additional information about the breakpoint mode.
+  /// This string is typically shown as a hover and can be translated.
+  std::optional<std::string> description;
+
+  /// Describes one or more type of breakpoint this mode applies to.
+  std::vector<BreakpointModeApplicability> appliesTo;
+};
+llvm::json::Value toJSON(const BreakpointMode &);
+
+/// Information about the capabilities of a debug adapter.
+struct Capabilities {
+  /// The debug adapter supports the `configurationDone` request.
+  std::optional<bool> supportsConfigurationDoneRequest;
+
+  /// The debug adapter supports function breakpoints.
+  std::optional<bool> supportsFunctionBreakpoints;
+
+  /// The debug adapter supports conditional breakpoints.
+  std::optional<bool> supportsConditionalBreakpoints;
+
+  /// The debug adapter supports breakpoints that break execution after a
+  /// specified number of hits.
+  std::optional<bool> supportsHitConditionalBreakpoints;
+
+  /// The debug adapter supports a (side effect free) `evaluate` request for
+  /// data hovers.
+  std::optional<bool> supportsEvaluateForHovers;
+
+  /// Available exception filter options for the `setExceptionBreakpoints`
+  /// request.
+  std::optional<std::vector<ExceptionBreakpointsFilter>>
+      exceptionBreakpointFilters;
+
+  /// The debug adapter supports stepping back via the `stepBack` and
+  /// `reverseContinue` requests.
+  std::optional<bool> supportsStepBack;
+
+  /// The debug adapter supports setting a variable to a value.
+  std::optional<bool> supportsSetVariable;
+
+  /// The debug adapter supports restarting a frame.
+  std::optional<bool> supportsRestartFrame;
+
+  /// The debug adapter supports the `gotoTargets` request.
+  std::optional<bool> supportsGotoTargetsRequest;
+
+  /// The debug adapter supports the `stepInTargets` request.
+  std::optional<bool> supportsStepInTargetsRequest;
+
+  /// The debug adapter supports the `completions` request.
+  std::optional<bool> supportsCompletionsRequest;
+
+  /// The set of characters that should trigger completion in a REPL. If not
+  /// specified, the UI should assume the `.` character.
+  std::optional<std::vector<std::string>> completionTriggerCharacters;
+
+  /// The debug adapter supports the `modules` request.
+  std::optional<bool> supportsModulesRequest;
+
+  /// The set of additional module information exposed by the debug adapter.
+  std::optional<std::vector<ColumnDescriptor>> additionalModuleColumns;
+
+  /// Checksum algorithms supported by the debug adapter.
+  std::optional<std::vector<ChecksumAlgorithm>> supportedChecksumAlgorithms;
+
+  /// The debug adapter supports the `restart` request. In this case a client
+  /// should not implement `restart` by terminating and relaunching the adapter
+  /// but by calling the `restart` request.
+  std::optional<bool> supportsRestartRequest;
+
+  /// The debug adapter supports `exceptionOptions` on the
+  /// `setExceptionBreakpoints` request.
+  std::optional<bool> supportsExceptionOptions;
+
+  /// The debug adapter supports a `format` attribute on the `stackTrace`,
+  /// `variables`, and `evaluate` requests.
+  std::optional<bool> supportsValueFormattingOptions;
+
+  /// The debug adapter supports the `exceptionInfo` request.
+  std::optional<bool> supportsExceptionInfoRequest;
+
+  /// The debug adapter supports the `terminateDebuggee` attribute on the
+  /// `disconnect` request.
+  std::optional<bool> supportTerminateDebuggee;
+
+  /// The debug adapter supports the `suspendDebuggee` attribute on the
+  /// `disconnect` request.
+  std::optional<bool> supportSuspendDebuggee;
+
+  /// The debug adapter supports the delayed loading of parts of the stack,
+  /// which requires that both the `startFrame` and `levels` arguments and the
+  /// `totalFrames` result of the `stackTrace` request are supported.
+  std::optional<bool> supportsDelayedStackTraceLoading;
+
+  /// The debug adapter supports the `loadedSources` request.
+  std::optional<bool> supportsLoadedSourcesRequest;
+
+  /// The debug adapter supports log points by interpreting the `logMessage`
+  /// attribute of the `SourceBreakpoint`.
+  std::optional<bool> supportsLogPoints;
+
+  /// The debug adapter supports the `terminateThreads` request.
+  std::optional<bool> supportsTerminateThreadsRequest;
+
+  /// The debug adapter supports the `setExpression` request.
+  std::optional<bool> supportsSetExpression;
+
+  /// The debug adapter supports the `terminate` request.
+  std::optional<bool> supportsTerminateRequest;
+
+  /// The debug adapter supports data breakpoints.
+  std::optional<bool> supportsDataBreakpoints;
+
+  /// The debug adapter supports the `readMemory` request.
+  std::optional<bool> supportsReadMemoryRequest;
+
+  /// The debug adapter supports the `writeMemory` request.
+  std::optional<bool> supportsWriteMemoryRequest;
+
+  /// The debug adapter supports the `disassemble` request.
+  std::optional<bool> supportsDisassembleRequest;
+
+  /// The debug adapter supports the `cancel` request.
+  std::optional<bool> supportsCancelRequest;
+
+  /// The debug adapter supports the `breakpointLocations` request.
+  std::optional<bool> supportsBreakpointLocationsRequest;
+
+  /// The debug adapter supports the `clipboard` context value in the `evaluate`
+  /// request.
+  std::optional<bool> supportsClipboardContext;
+
+  /// The debug adapter supports stepping granularities (argument `granularity`)
+  /// for the stepping requests.
+  std::optional<bool> supportsSteppingGranularity;
+
+  /// The debug adapter supports adding breakpoints based on instruction
+  /// references.
+  std::optional<bool> supportsInstructionBreakpoints;
+
+  /// The debug adapter supports `filterOptions` as an argument on the
+  /// `setExceptionBreakpoints` request.
+  std::optional<bool> supportsExceptionFilterOptions;
+
+  /// The debug adapter supports the `singleThread` property on the execution
+  /// requests (`continue`, `next`, `stepIn`, `stepOut`, `reverseContinue`,
+  /// `stepBack`).
+  std::optional<bool> supportsSingleThreadExecutionRequests;
+
+  /// The debug adapter supports the `asAddress` and `bytes` fields in the
+  /// `dataBreakpointInfo` request.
+  std::optional<bool> supportsDataBreakpointBytes;
+
+  /// Modes of breakpoints supported by the debug adapter, such as 'hardware' or
+  /// 'software'. If present, the client may allow the user to select a mode and
+  /// include it in its `setBreakpoints` request.
+  ///
+  /// Clients may present the first applicable mode in this array as the
+  /// 'default' mode in gestures that set breakpoints.
+  std::optional<std::vector<BreakpointMode>> breakpointModes;
+
+  /// The debug adapter supports ANSI escape sequences in styling of
+  /// `OutputEvent.output` and `Variable.value` fields.
+  std::optional<bool> supportsANSIStyling;
+
+  /// lldb-dap Extensions
+  std::optional<std::string> lldbVersion;
+};
+llvm::json::Value toJSON(const Capabilities &);
+
 /// A `Source` is a descriptor for source code. It is returned from the debug
 /// adapter as part of a `StackFrame` and it is used by clients when specifying
 /// breakpoints.



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