https://github.com/da-viper updated 
https://github.com/llvm/llvm-project/pull/142439

>From 69efc48d722d18600018f25db0f9ea46b9fd1d97 Mon Sep 17 00:00:00 2001
From: Ebuka Ezike <yerimy...@gmail.com>
Date: Wed, 28 May 2025 14:02:01 +0100
Subject: [PATCH 1/2] [lldb-dap] Use structured types for stepInTargets request

---
 lldb/tools/lldb-dap/Handler/RequestHandler.h  |  16 +-
 .../Handler/StepInTargetsRequestHandler.cpp   | 200 +++++++-----------
 .../lldb-dap/Protocol/ProtocolRequests.cpp    |   9 +
 .../lldb-dap/Protocol/ProtocolRequests.h      |  15 ++
 .../tools/lldb-dap/Protocol/ProtocolTypes.cpp |  27 +++
 lldb/tools/lldb-dap/Protocol/ProtocolTypes.h  |  29 +++
 lldb/unittests/DAP/ProtocolTypesTest.cpp      |  20 ++
 7 files changed, 186 insertions(+), 130 deletions(-)

diff --git a/lldb/tools/lldb-dap/Handler/RequestHandler.h 
b/lldb/tools/lldb-dap/Handler/RequestHandler.h
index 3a965bcc87a5e..559929ffb21e8 100644
--- a/lldb/tools/lldb-dap/Handler/RequestHandler.h
+++ b/lldb/tools/lldb-dap/Handler/RequestHandler.h
@@ -356,7 +356,21 @@ class StepInRequestHandler : public 
RequestHandler<protocol::StepInArguments,
   llvm::Error Run(const protocol::StepInArguments &args) const override;
 };
 
-class StepInTargetsRequestHandler : public LegacyRequestHandler {
+class StepInTargetsRequestHandler
+    : public RequestHandler<
+          protocol::StepInTargetsArguments,
+          llvm::Expected<protocol::StepInTargetsResponseBody>> {
+public:
+  using RequestHandler::RequestHandler;
+  static llvm::StringLiteral GetCommand() { return "stepInTargets"; }
+  FeatureSet GetSupportedFeatures() const override {
+    return {protocol::eAdapterFeatureStepInTargetsRequest};
+  }
+  llvm::Expected<protocol::StepInTargetsResponseBody>
+  Run(const protocol::StepInTargetsArguments &args) const override;
+};
+
+class StepInTargetsRequestHandler2 : public LegacyRequestHandler {
 public:
   using LegacyRequestHandler::LegacyRequestHandler;
   static llvm::StringLiteral GetCommand() { return "stepInTargets"; }
diff --git a/lldb/tools/lldb-dap/Handler/StepInTargetsRequestHandler.cpp 
b/lldb/tools/lldb-dap/Handler/StepInTargetsRequestHandler.cpp
index 9b99791599f82..1a76371be2d58 100644
--- a/lldb/tools/lldb-dap/Handler/StepInTargetsRequestHandler.cpp
+++ b/lldb/tools/lldb-dap/Handler/StepInTargetsRequestHandler.cpp
@@ -7,143 +7,85 @@
 
//===----------------------------------------------------------------------===//
 
 #include "DAP.h"
-#include "EventHelper.h"
-#include "JSONUtils.h"
+#include "Protocol/ProtocolRequests.h"
 #include "RequestHandler.h"
 #include "lldb/API/SBInstruction.h"
+#include "lldb/lldb-defines.h"
 
+using namespace lldb_dap::protocol;
 namespace lldb_dap {
 
-// "StepInTargetsRequest": {
-//   "allOf": [ { "$ref": "#/definitions/Request" }, {
-//     "type": "object",
-//     "description": "This request retrieves the possible step-in targets for
-//     the specified stack frame.\nThese targets can be used in the `stepIn`
-//     request.\nClients should only call this request if the corresponding
-//     capability `supportsStepInTargetsRequest` is true.", "properties": {
-//       "command": {
-//         "type": "string",
-//         "enum": [ "stepInTargets" ]
-//       },
-//       "arguments": {
-//         "$ref": "#/definitions/StepInTargetsArguments"
-//       }
-//     },
-//     "required": [ "command", "arguments"  ]
-//   }]
-// },
-// "StepInTargetsArguments": {
-//   "type": "object",
-//   "description": "Arguments for `stepInTargets` request.",
-//   "properties": {
-//     "frameId": {
-//       "type": "integer",
-//       "description": "The stack frame for which to retrieve the possible
-//       step-in targets."
-//     }
-//   },
-//   "required": [ "frameId" ]
-// },
-// "StepInTargetsResponse": {
-//   "allOf": [ { "$ref": "#/definitions/Response" }, {
-//     "type": "object",
-//     "description": "Response to `stepInTargets` request.",
-//     "properties": {
-//       "body": {
-//         "type": "object",
-//         "properties": {
-//           "targets": {
-//             "type": "array",
-//             "items": {
-//               "$ref": "#/definitions/StepInTarget"
-//             },
-//             "description": "The possible step-in targets of the specified
-//             source location."
-//           }
-//         },
-//         "required": [ "targets" ]
-//       }
-//     },
-//     "required": [ "body" ]
-//   }]
-// }
-void StepInTargetsRequestHandler::operator()(
-    const llvm::json::Object &request) const {
-  llvm::json::Object response;
-  FillResponse(request, response);
-  const auto *arguments = request.getObject("arguments");
-
+// This request retrieves the possible step-in targets for the specified stack
+// frame.
+// These targets can be used in the `stepIn` request.
+// Clients should only call this request if the corresponding capability
+// `supportsStepInTargetsRequest` is true.
+llvm::Expected<StepInTargetsResponseBody>
+StepInTargetsRequestHandler::Run(const StepInTargetsArguments &args) const {
   dap.step_in_targets.clear();
-  lldb::SBFrame frame = dap.GetLLDBFrame(*arguments);
-  if (frame.IsValid()) {
-    lldb::SBAddress pc_addr = frame.GetPCAddress();
-    lldb::SBAddress line_end_addr =
-        pc_addr.GetLineEntry().GetSameLineContiguousAddressRangeEnd(true);
-    lldb::SBInstructionList insts = dap.target.ReadInstructions(
-        pc_addr, line_end_addr, /*flavor_string=*/nullptr);
-
-    if (!insts.IsValid()) {
-      response["success"] = false;
-      response["message"] = "Failed to get instructions for frame.";
-      dap.SendJSON(llvm::json::Value(std::move(response)));
-      return;
-    }
+  const lldb::SBFrame frame = dap.GetLLDBFrame(args.frameId);
+  if (!frame.IsValid())
+    return llvm::make_error<DAPError>("Failed to get frame for input 
frameId.");
+
+  lldb::SBAddress pc_addr = frame.GetPCAddress();
+  lldb::SBAddress line_end_addr =
+      pc_addr.GetLineEntry().GetSameLineContiguousAddressRangeEnd(true);
+  lldb::SBInstructionList insts = dap.target.ReadInstructions(
+      pc_addr, line_end_addr, /*flavor_string=*/nullptr);
+
+  if (!insts.IsValid())
+    return llvm::make_error<DAPError>("Failed to get instructions for frame.");
+
+  StepInTargetsResponseBody body;
+  const size_t num_insts = insts.GetSize();
+  for (size_t i = 0; i < num_insts; ++i) {
+    lldb::SBInstruction inst = insts.GetInstructionAtIndex(i);
+    if (!inst.IsValid())
+      break;
+
+    const lldb::addr_t inst_addr = 
inst.GetAddress().GetLoadAddress(dap.target);
+    if (inst_addr == LLDB_INVALID_ADDRESS)
+      break;
+
+    // Note: currently only x86/x64 supports flow kind.
+    const lldb::InstructionControlFlowKind flow_kind =
+        inst.GetControlFlowKind(dap.target);
+
+    if (flow_kind == lldb::eInstructionControlFlowKindCall) {
+
+      const llvm::StringRef call_operand_name = inst.GetOperands(dap.target);
+      lldb::addr_t call_target_addr = LLDB_INVALID_ADDRESS;
+      if (call_operand_name.getAsInteger(0, call_target_addr))
+        continue;
+
+      const lldb::SBAddress call_target_load_addr =
+          dap.target.ResolveLoadAddress(call_target_addr);
+      if (!call_target_load_addr.IsValid())
+        continue;
+
+      // The existing ThreadPlanStepInRange only accept step in target
+      // function with debug info.
+      lldb::SBSymbolContext sc = dap.target.ResolveSymbolContextForAddress(
+          call_target_load_addr, lldb::eSymbolContextFunction);
+
+      // The existing ThreadPlanStepInRange only accept step in target
+      // function with debug info.
+      llvm::StringRef step_in_target_name;
+      if (sc.IsValid() && sc.GetFunction().IsValid())
+        step_in_target_name = sc.GetFunction().GetDisplayName();
+
+      // Skip call sites if we fail to resolve its symbol name.
+      if (step_in_target_name.empty())
+        continue;
 
-    llvm::json::Array step_in_targets;
-    const auto num_insts = insts.GetSize();
-    for (size_t i = 0; i < num_insts; ++i) {
-      lldb::SBInstruction inst = insts.GetInstructionAtIndex(i);
-      if (!inst.IsValid())
-        break;
-
-      lldb::addr_t inst_addr = inst.GetAddress().GetLoadAddress(dap.target);
-
-      // Note: currently only x86/x64 supports flow kind.
-      lldb::InstructionControlFlowKind flow_kind =
-          inst.GetControlFlowKind(dap.target);
-      if (flow_kind == lldb::eInstructionControlFlowKindCall) {
-        // Use call site instruction address as id which is easy to debug.
-        llvm::json::Object step_in_target;
-        step_in_target["id"] = inst_addr;
-
-        llvm::StringRef call_operand_name = inst.GetOperands(dap.target);
-        lldb::addr_t call_target_addr;
-        if (call_operand_name.getAsInteger(0, call_target_addr))
-          continue;
-
-        lldb::SBAddress call_target_load_addr =
-            dap.target.ResolveLoadAddress(call_target_addr);
-        if (!call_target_load_addr.IsValid())
-          continue;
-
-        // The existing ThreadPlanStepInRange only accept step in target
-        // function with debug info.
-        lldb::SBSymbolContext sc = dap.target.ResolveSymbolContextForAddress(
-            call_target_load_addr, lldb::eSymbolContextFunction);
-
-        // The existing ThreadPlanStepInRange only accept step in target
-        // function with debug info.
-        std::string step_in_target_name;
-        if (sc.IsValid() && sc.GetFunction().IsValid())
-          step_in_target_name = sc.GetFunction().GetDisplayName();
-
-        // Skip call sites if we fail to resolve its symbol name.
-        if (step_in_target_name.empty())
-          continue;
-
-        dap.step_in_targets.try_emplace(inst_addr, step_in_target_name);
-        step_in_target.try_emplace("label", step_in_target_name);
-        step_in_targets.emplace_back(std::move(step_in_target));
-      }
+      StepInTarget target;
+      target.id = inst_addr;
+      target.label = step_in_target_name;
+      dap.step_in_targets.try_emplace(inst_addr, step_in_target_name);
+      body.targets.emplace_back(std::move(target));
     }
-    llvm::json::Object body;
-    body.try_emplace("targets", std::move(step_in_targets));
-    response.try_emplace("body", std::move(body));
-  } else {
-    response["success"] = llvm::json::Value(false);
-    response["message"] = "Failed to get frame for input frameId.";
   }
-  dap.SendJSON(llvm::json::Value(std::move(response)));
-}
+  return body;
+};
 
 } // namespace lldb_dap
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp 
b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp
index 4160077d419e1..a7f28fb566d3d 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.cpp
@@ -382,6 +382,15 @@ bool fromJSON(const llvm::json::Value &Params, 
StepInArguments &SIA,
          OM.mapOptional("granularity", SIA.granularity);
 }
 
+bool fromJSON(const llvm::json::Value &Params, StepInTargetsArguments &SITA,
+              llvm::json::Path P) {
+  json::ObjectMapper OM(Params, P);
+  return OM && OM.map("frameId", SITA.frameId);
+}
+llvm::json::Value toJSON(const StepInTargetsResponseBody &SITR) {
+  return llvm::json::Object{{"targets", SITR.targets}};
+}
+
 bool fromJSON(const llvm::json::Value &Params, StepOutArguments &SOA,
               llvm::json::Path P) {
   json::ObjectMapper OM(Params, P);
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h 
b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h
index 7c774e50d6e56..570a0b6d39682 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolRequests.h
@@ -523,6 +523,21 @@ bool fromJSON(const llvm::json::Value &, StepInArguments 
&, llvm::json::Path);
 /// body field is required.
 using StepInResponse = VoidResponse;
 
+/// Arguments for `stepInTargets` request.
+struct StepInTargetsArguments {
+  /// The stack frame for which to retrieve the possible step-in targets.
+  uint64_t frameId = LLDB_INVALID_FRAME_ID;
+};
+bool fromJSON(const llvm::json::Value &, StepInTargetsArguments &,
+              llvm::json::Path);
+
+/// Response to `stepInTargets` request.
+struct StepInTargetsResponseBody {
+  /// The possible step-in targets of the specified source location.
+  std::vector<StepInTarget> targets;
+};
+llvm::json::Value toJSON(const StepInTargetsResponseBody &);
+
 /// Arguments for `stepOut` request.
 struct StepOutArguments {
   /// Specifies the thread for which to resume execution for one step-out (of
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp 
b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
index 3b297a0bd431f..440613b201c42 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
@@ -582,6 +582,33 @@ llvm::json::Value toJSON(const SteppingGranularity &SG) {
   llvm_unreachable("unhandled stepping granularity.");
 }
 
+bool fromJSON(const llvm::json::Value &Params, StepInTarget &SIT,
+              llvm::json::Path P) {
+  json::ObjectMapper O(Params, P);
+  return O && O.map("id", SIT.id) && O.map("label", SIT.label) &&
+         O.mapOptional("line", SIT.line) &&
+         O.mapOptional("column", SIT.column) &&
+         O.mapOptional("endLine", SIT.endLine) &&
+         O.mapOptional("endColumn", SIT.endColumn);
+}
+
+llvm::json::Value toJSON(const StepInTarget &SIT) {
+  json::Object target;
+
+  target.insert({"id", SIT.id});
+  target.insert({"label", SIT.label});
+  if (SIT.line)
+    target.insert({"line", SIT.line});
+  if (SIT.column)
+    target.insert({"column", SIT.column});
+  if (SIT.endLine)
+    target.insert({"endLine", SIT.endLine});
+  if (SIT.endColumn)
+    target.insert({"endColumn", SIT.endColumn});
+
+  return target;
+}
+
 bool fromJSON(const llvm::json::Value &Params, ValueFormat &VF,
               llvm::json::Path P) {
   json::ObjectMapper O(Params, P);
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h 
b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
index f5e21c96fe17f..edaca049a6ffa 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
@@ -24,6 +24,7 @@
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/Support/JSON.h"
 #include <cstdint>
+#include <limits>
 #include <optional>
 #include <string>
 
@@ -414,6 +415,34 @@ bool fromJSON(const llvm::json::Value &, 
SteppingGranularity &,
               llvm::json::Path);
 llvm::json::Value toJSON(const SteppingGranularity &);
 
+/// A `StepInTarget` can be used in the `stepIn` request and determines into
+/// which single target the `stepIn` request should step.
+struct StepInTarget {
+  /// Unique identifier for a step-in target.
+  uint64_t id = std::numeric_limits<uint64_t>::max();
+
+  /// The name of the step-in target (shown in the UI).
+  std::string label;
+
+  /// The line of the step-in target.
+  std::optional<uint64_t> line;
+
+  /// Start position of the range covered by the step in target. It is measured
+  /// in UTF-16 code units and the client capability `columnsStartAt1`
+  /// determines whether it is 0- or 1-based.
+  std::optional<uint64_t> column;
+
+  /// The end line of the range covered by the step-in target.
+  std::optional<uint64_t> endLine;
+
+  /// End position of the range covered by the step in target. It is measured 
in
+  /// UTF-16 code units and the client capability `columnsStartAt1` determines
+  /// whether it is 0- or 1-based.
+  std::optional<uint64_t> endColumn;
+};
+bool fromJSON(const llvm::json::Value &, StepInTarget &, llvm::json::Path);
+llvm::json::Value toJSON(const StepInTarget &);
+
 /// Provides formatting information for a value.
 struct ValueFormat {
   /// Display the value in hex.
diff --git a/lldb/unittests/DAP/ProtocolTypesTest.cpp 
b/lldb/unittests/DAP/ProtocolTypesTest.cpp
index 41703f4a071fb..5949abcb717d6 100644
--- a/lldb/unittests/DAP/ProtocolTypesTest.cpp
+++ b/lldb/unittests/DAP/ProtocolTypesTest.cpp
@@ -602,3 +602,23 @@ TEST(ProtocolTypesTest, DisassembledInstruction) {
   EXPECT_EQ(instruction.presentationHint,
             deserialized_instruction->presentationHint);
 }
+
+TEST(ProtocolTypesTest, StepInTarget) {
+  StepInTarget target;
+  target.id = 230;
+  target.label = "the_function_name";
+  target.line = 2;
+  target.column = 320;
+  target.endLine = 32;
+  target.endColumn = 23;
+
+  llvm::Expected<StepInTarget> deserialized_target = roundtrip(target);
+  ASSERT_THAT_EXPECTED(deserialized_target, llvm::Succeeded());
+
+  EXPECT_EQ(target.id, deserialized_target->id);
+  EXPECT_EQ(target.label, deserialized_target->label);
+  EXPECT_EQ(target.line, deserialized_target->line);
+  EXPECT_EQ(target.column, deserialized_target->column);
+  EXPECT_EQ(target.endLine, deserialized_target->endLine);
+  EXPECT_EQ(target.endColumn, deserialized_target->endColumn);
+}
\ No newline at end of file

>From 8db9cedd09542379e9eb4b1e953dfd5d7714426b Mon Sep 17 00:00:00 2001
From: Ebuka Ezike <yerimy...@gmail.com>
Date: Tue, 3 Jun 2025 15:35:12 +0100
Subject: [PATCH 2/2] [lldb-dap] add review changes.

---
 .../test/tools/lldb-dap/dap_server.py         |  7 +++--
 .../stepInTargets/TestDAP_stepInTargets.py    | 28 +++++++++++++++++++
 lldb/tools/lldb-dap/EventHelper.cpp           | 17 +++++++++++
 lldb/tools/lldb-dap/EventHelper.h             |  2 ++
 .../lldb-dap/Handler/AttachRequestHandler.cpp |  1 +
 .../lldb-dap/Handler/LaunchRequestHandler.cpp |  1 +
 .../tools/lldb-dap/Protocol/ProtocolTypes.cpp |  4 +--
 lldb/tools/lldb-dap/Protocol/ProtocolTypes.h  |  2 +-
 8 files changed, 56 insertions(+), 6 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 6b41aef2bb5b8..f1e3cab06ccde 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
@@ -153,7 +153,7 @@ def __init__(
         self.recv_thread = threading.Thread(target=self._read_packet_thread)
         self.process_event_body = None
         self.exit_status: Optional[int] = None
-        self.initialize_body = None
+        self.initialize_body: dict[str, Any] = {}
         self.progress_events: list[Event] = []
         self.reverse_requests = []
         self.sequence = 1
@@ -300,6 +300,9 @@ def _handle_recv_packet(self, packet: 
Optional[ProtocolMessage]) -> bool:
             elif event == "breakpoint":
                 # Breakpoint events are sent when a breakpoint is resolved
                 self._update_verified_breakpoints([body["breakpoint"]])
+            elif event == "capabilities":
+                # update the capabilities with new ones from the event.
+                self.initialize_body.update(body["capabilities"])
 
         elif packet_type == "response":
             if packet["command"] == "disconnect":
@@ -494,7 +497,7 @@ def get_initialize_value(self, key):
         """
         if self.initialize_body and key in self.initialize_body:
             return self.initialize_body[key]
-        return None
+        raise ValueError(f"no value for key: {key} in {self.initialize_body}")
 
     def get_threads(self):
         if self.threads is None:
diff --git 
a/lldb/test/API/tools/lldb-dap/stepInTargets/TestDAP_stepInTargets.py 
b/lldb/test/API/tools/lldb-dap/stepInTargets/TestDAP_stepInTargets.py
index 07acfe07c9ffc..d71f094e08d8a 100644
--- a/lldb/test/API/tools/lldb-dap/stepInTargets/TestDAP_stepInTargets.py
+++ b/lldb/test/API/tools/lldb-dap/stepInTargets/TestDAP_stepInTargets.py
@@ -78,3 +78,31 @@ def test_basic(self):
         leaf_frame = self.dap_server.get_stackFrame()
         self.assertIsNotNone(leaf_frame, "expect a leaf frame")
         self.assertEqual(step_in_targets[1]["label"], leaf_frame["name"])
+
+    def test_dynamic_capability(self):
+        program = self.getBuildArtifact("a.out")
+        self.build_and_launch(program)
+        source = "main.cpp"
+        bp_lines = [line_number(source, "// set breakpoint here")]
+        breakpoint_ids = self.set_source_breakpoints(source, bp_lines)
+        self.assertEqual(
+            len(breakpoint_ids), len(bp_lines), "expect correct number of 
breakpoints"
+        )
+        is_supported = self.dap_server.get_initialize_value(
+            "supportsStepInTargetsRequest"
+        )
+        arch: str = self.getArchitecture()
+        if arch.startswith("x86"):
+            self.assertTrue(
+                is_supported,
+                f"expect capability `stepInTarget` is supported with 
architecture {arch}",
+            )
+        else:
+            self.assertFalse(
+                is_supported,
+                f"expect capability `stepInTarget` is not supported with 
architecture {arch}",
+            )
+
+        # clear breakpoints.
+        self.set_source_breakpoints(source, [])
+        self.continue_to_exit()
diff --git a/lldb/tools/lldb-dap/EventHelper.cpp 
b/lldb/tools/lldb-dap/EventHelper.cpp
index c698084836e2f..d9438182a9978 100644
--- a/lldb/tools/lldb-dap/EventHelper.cpp
+++ b/lldb/tools/lldb-dap/EventHelper.cpp
@@ -33,6 +33,23 @@ static void SendThreadExitedEvent(DAP &dap, lldb::tid_t tid) 
{
   dap.SendJSON(llvm::json::Value(std::move(event)));
 }
 
+void SendAdditionalCapabilities(DAP &dap) {
+  if (dap.target.IsValid()) {
+    // FIXME: stepInTargets request is only supported by the x86 architecture
+    // remove when `lldb::InstructionControlFlowKind` is supported by other
+    // architectures
+    const llvm::StringRef target_triple = dap.target.GetTriple();
+    if (!target_triple.starts_with("x86")) {
+      llvm::json::Object event(CreateEventObject("capabilities"));
+      llvm::json::Object capabilities{{"supportsStepInTargetsRequest", false}};
+
+      llvm::json::Object body;
+      body.try_emplace("capabilities", std::move(capabilities));
+      event.try_emplace("body", std::move(body));
+      dap.SendJSON(llvm::json::Value(std::move(event)));
+    }
+  }
+}
 // "ProcessEvent": {
 //   "allOf": [
 //     { "$ref": "#/definitions/Event" },
diff --git a/lldb/tools/lldb-dap/EventHelper.h 
b/lldb/tools/lldb-dap/EventHelper.h
index 90b009c73089e..c0d33fa6f764b 100644
--- a/lldb/tools/lldb-dap/EventHelper.h
+++ b/lldb/tools/lldb-dap/EventHelper.h
@@ -16,6 +16,8 @@ struct DAP;
 
 enum LaunchMethod { Launch, Attach, AttachForSuspendedLaunch };
 
+void SendAdditionalCapabilities(DAP &dap);
+
 void SendProcessEvent(DAP &dap, LaunchMethod launch_method);
 
 void SendThreadStoppedEvent(DAP &dap);
diff --git a/lldb/tools/lldb-dap/Handler/AttachRequestHandler.cpp 
b/lldb/tools/lldb-dap/Handler/AttachRequestHandler.cpp
index 371349a26866e..308cc06371152 100644
--- a/lldb/tools/lldb-dap/Handler/AttachRequestHandler.cpp
+++ b/lldb/tools/lldb-dap/Handler/AttachRequestHandler.cpp
@@ -141,6 +141,7 @@ Error AttachRequestHandler::Run(const 
AttachRequestArguments &args) const {
 
 void AttachRequestHandler::PostRun() const {
   dap.SendJSON(CreateEventObject("initialized"));
+  SendAdditionalCapabilities(dap);
 }
 
 } // namespace lldb_dap
diff --git a/lldb/tools/lldb-dap/Handler/LaunchRequestHandler.cpp 
b/lldb/tools/lldb-dap/Handler/LaunchRequestHandler.cpp
index 1d7b4b7009462..0ae89b6b09d4c 100644
--- a/lldb/tools/lldb-dap/Handler/LaunchRequestHandler.cpp
+++ b/lldb/tools/lldb-dap/Handler/LaunchRequestHandler.cpp
@@ -68,6 +68,7 @@ Error LaunchRequestHandler::Run(const LaunchRequestArguments 
&arguments) const {
 
 void LaunchRequestHandler::PostRun() const {
   dap.SendJSON(CreateEventObject("initialized"));
+  SendAdditionalCapabilities(dap);
 }
 
 } // namespace lldb_dap
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp 
b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
index 440613b201c42..3b843c75891b3 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.cpp
@@ -593,10 +593,8 @@ bool fromJSON(const llvm::json::Value &Params, 
StepInTarget &SIT,
 }
 
 llvm::json::Value toJSON(const StepInTarget &SIT) {
-  json::Object target;
+  json::Object target{{"id", SIT.id}, {"label", SIT.label}};
 
-  target.insert({"id", SIT.id});
-  target.insert({"label", SIT.label});
   if (SIT.line)
     target.insert({"line", SIT.line});
   if (SIT.column)
diff --git a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h 
b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
index edaca049a6ffa..92b02903140b8 100644
--- a/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
+++ b/lldb/tools/lldb-dap/Protocol/ProtocolTypes.h
@@ -419,7 +419,7 @@ llvm::json::Value toJSON(const SteppingGranularity &);
 /// which single target the `stepIn` request should step.
 struct StepInTarget {
   /// Unique identifier for a step-in target.
-  uint64_t id = std::numeric_limits<uint64_t>::max();
+  uint64_t id = LLDB_INVALID_ADDRESS;
 
   /// The name of the step-in target (shown in the UI).
   std::string label;

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