[lldb] Refactor LLDB Breakpoint Event Notifications to centralize and eliminate code duplication (llvm#164739)

### Summary

This PR refactors breakpoint event notification in LLDB to centralize
and eliminate code duplication. It creates a unified method in the
`Target` class for sending breakpoint change events. The new methods
check if listeners exist before broadcasting events

### Test

<img width="1532" height="76" alt="Screenshot 2025-10-23 at 12 49 31 PM"
src="https://github.com/user-attachments/assets/6d6a6da6-9684-463c-aeeb-90663cdbd077"
/>

---------

Co-authored-by: Piyush Jaiswal <[email protected]>

Author: 2 people

lldb/include/lldb/Target/Target.h

@@ -1346,6 +1346,13 @@ class Target : public std::enable_shared_from_this<Target>,
                                const lldb_private::RegisterFlags &flags,
                                uint32_t byte_size);
 
+  /// Sends a breakpoint notification event.
+  void NotifyBreakpointChanged(Breakpoint &bp,
+                               lldb::BreakpointEventType event_kind);
+  /// Sends a breakpoint notification event.
+  void NotifyBreakpointChanged(Breakpoint &bp,
+                               const lldb::EventDataSP &breakpoint_data_sp);
+
   llvm::Expected<lldb::DisassemblerSP>
   ReadInstructions(const Address &start_addr, uint32_t count,
                    const char *flavor_string = nullptr);

lldb/source/Breakpoint/Breakpoint.cpp

@@ -1098,25 +1098,18 @@ bool Breakpoint::EvaluatePrecondition(StoppointCallbackContext &context) {
 }
 
 void Breakpoint::SendBreakpointChangedEvent(
-    lldb::BreakpointEventType eventKind) {
-  if (!IsInternal() && GetTarget().EventTypeHasListeners(
-                           Target::eBroadcastBitBreakpointChanged)) {
-    std::shared_ptr<BreakpointEventData> data =
-        std::make_shared<BreakpointEventData>(eventKind, shared_from_this());
-
-    GetTarget().BroadcastEvent(Target::eBroadcastBitBreakpointChanged, data);
-  }
+    lldb::BreakpointEventType event_kind) {
+  if (!IsInternal())
+    GetTarget().NotifyBreakpointChanged(*this, event_kind);
 }
 
 void Breakpoint::SendBreakpointChangedEvent(
     const lldb::EventDataSP &breakpoint_data_sp) {
   if (!breakpoint_data_sp)
     return;
 
-  if (!IsInternal() &&
-      GetTarget().EventTypeHasListeners(Target::eBroadcastBitBreakpointChanged))
-    GetTarget().BroadcastEvent(Target::eBroadcastBitBreakpointChanged,
-                               breakpoint_data_sp);
+  if (!IsInternal())
+    GetTarget().NotifyBreakpointChanged(*this, breakpoint_data_sp);
 }
 
 const char *Breakpoint::BreakpointEventTypeAsCString(BreakpointEventType type) {

lldb/source/Breakpoint/BreakpointList.cpp

@@ -16,13 +16,7 @@ using namespace lldb;
 using namespace lldb_private;
 
 static void NotifyChange(const BreakpointSP &bp, BreakpointEventType event) {
-  Target &target = bp->GetTarget();
-  if (target.EventTypeHasListeners(Target::eBroadcastBitBreakpointChanged)) {
-    auto event_data_sp =
-        std::make_shared<Breakpoint::BreakpointEventData>(event, bp);
-    target.BroadcastEvent(Target::eBroadcastBitBreakpointChanged,
-                          event_data_sp);
-  }
+  bp->GetTarget().NotifyBreakpointChanged(*bp, event);
 }
 
 BreakpointList::BreakpointList(bool is_internal)

lldb/source/Breakpoint/BreakpointLocation.cpp

@@ -749,13 +749,11 @@ void BreakpointLocation::Dump(Stream *s) const {
 
 void BreakpointLocation::SendBreakpointLocationChangedEvent(
     lldb::BreakpointEventType eventKind) {
-  if (!m_owner.IsInternal() && m_owner.GetTarget().EventTypeHasListeners(
-                                   Target::eBroadcastBitBreakpointChanged)) {
+  if (!m_owner.IsInternal()) {
     auto data_sp = std::make_shared<Breakpoint::BreakpointEventData>(
         eventKind, m_owner.shared_from_this());
     data_sp->GetBreakpointLocationCollection().Add(shared_from_this());
-    m_owner.GetTarget().BroadcastEvent(Target::eBroadcastBitBreakpointChanged,
-                                       data_sp);
+    m_owner.GetTarget().NotifyBreakpointChanged(m_owner, data_sp);
   }
 }
 

lldb/source/Target/Target.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Target/Target.h"
+#include "lldb/Breakpoint/Breakpoint.h"
 #include "lldb/Breakpoint/BreakpointIDList.h"
 #include "lldb/Breakpoint/BreakpointPrecondition.h"
 #include "lldb/Breakpoint/BreakpointResolver.h"
@@ -5271,3 +5272,19 @@ void Target::ClearSectionLoadList() { GetSectionLoadList().Clear(); }
 void Target::DumpSectionLoadList(Stream &s) {
   GetSectionLoadList().Dump(s, this);
 }
+
+void Target::NotifyBreakpointChanged(Breakpoint &bp,
+                                     lldb::BreakpointEventType eventKind) {
+  if (EventTypeHasListeners(Target::eBroadcastBitBreakpointChanged)) {
+    std::shared_ptr<Breakpoint::BreakpointEventData> data_sp =
+        std::make_shared<Breakpoint::BreakpointEventData>(
+            eventKind, bp.shared_from_this());
+    BroadcastEvent(Target::eBroadcastBitBreakpointChanged, data_sp);
+  }
+}
+
+void Target::NotifyBreakpointChanged(
+    Breakpoint &bp, const lldb::EventDataSP &breakpoint_data_sp) {
+  if (EventTypeHasListeners(Target::eBroadcastBitBreakpointChanged))
+    BroadcastEvent(Target::eBroadcastBitBreakpointChanged, breakpoint_data_sp);
+}