[lldb][progress] Hook up new broadcast bit and progress manager

This commit adds the functionality to broadcast events using the
`Debugger::eBroadcastProgressCategory`
bit (llvm#81169) by keeping track of these
reports with the `ProgressManager`
class (llvm#81319). The new bit is
used in such a way that it will only broadcast the initial and final
progress reports for specific progress categories that are managed by
the progress manager.

This commit also adds a new test to the progress report unit test that
checks that only the initial/final reports are broadcasted when using
the new bit.

Author: chelcassanova

lldb/include/lldb/Core/Debugger.h

@@ -593,6 +593,7 @@ class Debugger : public std::enable_shared_from_this<Debugger>,
   friend class CommandInterpreter;
   friend class REPL;
   friend class Progress;
+  friend class ProgressManager;
 
   /// Report progress events.
   ///
@@ -623,10 +624,11 @@ class Debugger : public std::enable_shared_from_this<Debugger>,
   ///   debugger identifier that this progress should be delivered to. If this
   ///   optional parameter does not have a value, the progress will be
   ///   delivered to all debuggers.
-  static void ReportProgress(uint64_t progress_id, std::string title,
-                             std::string details, uint64_t completed,
-                             uint64_t total,
-                             std::optional<lldb::user_id_t> debugger_id);
+  static void
+  ReportProgress(uint64_t progress_id, std::string title, std::string details,
+                 uint64_t completed, uint64_t total,
+                 std::optional<lldb::user_id_t> debugger_id,
+                 uint32_t progress_category_bit = eBroadcastBitProgress);
 
   static void ReportDiagnosticImpl(DiagnosticEventData::Type type,
                                    std::string message,

lldb/include/lldb/Core/Progress.h

@@ -9,10 +9,11 @@
 #ifndef LLDB_CORE_PROGRESS_H
 #define LLDB_CORE_PROGRESS_H
 
-#include "lldb/Utility/ConstString.h"
+#include "lldb/lldb-forward.h"
 #include "lldb/lldb-types.h"
 #include "llvm/ADT/StringMap.h"
 #include <atomic>
+#include <cstdint>
 #include <mutex>
 #include <optional>
 
@@ -97,27 +98,36 @@ class Progress {
   /// Used to indicate a non-deterministic progress report
   static constexpr uint64_t kNonDeterministicTotal = UINT64_MAX;
 
+  /// Data belonging to this Progress event. This data is used by the Debugger
+  /// to broadcast the event and by the ProgressManager for bookkeeping.
+  struct ProgressData {
+    /// The title of the progress activity, also used as a category.
+    std::string title;
+    /// More specific information about the current file being displayed in the
+    /// report.
+    std::string details;
+    /// A unique integer identifier for progress reporting.
+    uint64_t progress_id;
+    /// How much work ([0...m_total]) that has been completed.
+    uint64_t completed;
+    /// Total amount of work, use a std::nullopt in the constructor for non
+    /// deterministic progress.
+    uint64_t total;
+    /// The optional debugger ID to report progress to. If this has no value
+    /// then all debuggers will receive this event.
+    std::optional<lldb::user_id_t> debugger_id;
+  };
+
 private:
   void ReportProgress();
   static std::atomic<uint64_t> g_id;
-  /// The title of the progress activity.
-  std::string m_title;
-  std::string m_details;
   std::mutex m_mutex;
-  /// A unique integer identifier for progress reporting.
-  const uint64_t m_id;
-  /// How much work ([0...m_total]) that has been completed.
-  uint64_t m_completed;
-  /// Total amount of work, use a std::nullopt in the constructor for non
-  /// deterministic progress.
-  uint64_t m_total;
-  /// The optional debugger ID to report progress to. If this has no value then
-  /// all debuggers will receive this event.
-  std::optional<lldb::user_id_t> m_debugger_id;
   /// Set to true when progress has been reported where m_completed == m_total
   /// to ensure that we don't send progress updates after progress has
   /// completed.
   bool m_complete = false;
+  /// Data needed by the debugger to broadcast a progress event.
+  ProgressData m_progress_data;
 };
 
 /// A class used to group progress reports by category. This is done by using a
@@ -130,13 +140,16 @@ class ProgressManager {
   ~ProgressManager();
 
   /// Control the refcount of the progress report category as needed.
-  void Increment(std::string category);
-  void Decrement(std::string category);
+  void Increment(const Progress::ProgressData &);
+  void Decrement(const Progress::ProgressData &);
 
   static ProgressManager &Instance();
 
+  void ReportProgress(Progress::ProgressData);
+
 private:
-  llvm::StringMap<uint64_t> m_progress_category_map;
+  llvm::StringMap<std::pair<uint64_t, Progress::ProgressData>>
+      m_progress_category_map;
   std::mutex m_progress_map_mutex;
 };
 

lldb/source/Core/Debugger.cpp

@@ -15,6 +15,7 @@
 #include "lldb/Core/ModuleList.h"
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Core/PluginManager.h"
+#include "lldb/Core/Progress.h"
 #include "lldb/Core/StreamAsynchronousIO.h"
 #include "lldb/DataFormatters/DataVisualization.h"
 #include "lldb/Expression/REPL.h"
@@ -1433,13 +1434,14 @@ void Debugger::SetDestroyCallback(
 static void PrivateReportProgress(Debugger &debugger, uint64_t progress_id,
                                   std::string title, std::string details,
                                   uint64_t completed, uint64_t total,
-                                  bool is_debugger_specific) {
+                                  bool is_debugger_specific,
+                                  uint32_t progress_broadcast_bit) {
   // Only deliver progress events if we have any progress listeners.
-  const uint32_t event_type = Debugger::eBroadcastBitProgress;
-  if (!debugger.GetBroadcaster().EventTypeHasListeners(event_type))
+  if (!debugger.GetBroadcaster().EventTypeHasListeners(progress_broadcast_bit))
     return;
+
   EventSP event_sp(new Event(
-      event_type,
+      progress_broadcast_bit,
       new ProgressEventData(progress_id, std::move(title), std::move(details),
                             completed, total, is_debugger_specific)));
   debugger.GetBroadcaster().BroadcastEvent(event_sp);
@@ -1448,7 +1450,8 @@ static void PrivateReportProgress(Debugger &debugger, uint64_t progress_id,
 void Debugger::ReportProgress(uint64_t progress_id, std::string title,
                               std::string details, uint64_t completed,
                               uint64_t total,
-                              std::optional<lldb::user_id_t> debugger_id) {
+                              std::optional<lldb::user_id_t> debugger_id,
+                              uint32_t progress_category_bit) {
   // Check if this progress is for a specific debugger.
   if (debugger_id) {
     // It is debugger specific, grab it and deliver the event if the debugger
@@ -1457,7 +1460,8 @@ void Debugger::ReportProgress(uint64_t progress_id, std::string title,
     if (debugger_sp)
       PrivateReportProgress(*debugger_sp, progress_id, std::move(title),
                             std::move(details), completed, total,
-                            /*is_debugger_specific*/ true);
+                            /*is_debugger_specific*/ true,
+                            progress_category_bit);
     return;
   }
   // The progress event is not debugger specific, iterate over all debuggers
@@ -1467,7 +1471,8 @@ void Debugger::ReportProgress(uint64_t progress_id, std::string title,
     DebuggerList::iterator pos, end = g_debugger_list_ptr->end();
     for (pos = g_debugger_list_ptr->begin(); pos != end; ++pos)
       PrivateReportProgress(*(*pos), progress_id, title, details, completed,
-                            total, /*is_debugger_specific*/ false);
+                            total, /*is_debugger_specific*/ false,
+                            progress_category_bit);
   }
 }
 

lldb/source/Core/Progress.cpp

@@ -11,6 +11,7 @@
 #include "lldb/Core/Debugger.h"
 #include "lldb/Utility/StreamString.h"
 
+#include <cstdint>
 #include <mutex>
 #include <optional>
 
@@ -22,38 +23,46 @@ std::atomic<uint64_t> Progress::g_id(0);
 Progress::Progress(std::string title, std::string details,
                    std::optional<uint64_t> total,
                    lldb_private::Debugger *debugger)
-    : m_title(title), m_details(details), m_id(++g_id), m_completed(0),
-      m_total(Progress::kNonDeterministicTotal) {
+    : m_progress_data{title,
+                      details,
+                      ++g_id,
+                      /*m_progress_data.completed=*/0,
+                      Progress::kNonDeterministicTotal,
+                      /*m_progress_data.debugger_id=*/std::nullopt} {
   if (total)
-    m_total = *total;
+    m_progress_data.total = *total;
 
   if (debugger)
-    m_debugger_id = debugger->GetID();
+    m_progress_data.debugger_id = debugger->GetID();
+
   std::lock_guard<std::mutex> guard(m_mutex);
   ReportProgress();
+  ProgressManager::Instance().Increment(m_progress_data);
 }
 
 Progress::~Progress() {
   // Make sure to always report progress completed when this object is
   // destructed so it indicates the progress dialog/activity should go away.
   std::lock_guard<std::mutex> guard(m_mutex);
-  if (!m_completed)
-    m_completed = m_total;
+  if (!m_progress_data.completed)
+    m_progress_data.completed = m_progress_data.total;
   ReportProgress();
+  ProgressManager::Instance().Decrement(m_progress_data);
 }
 
 void Progress::Increment(uint64_t amount,
                          std::optional<std::string> updated_detail) {
   if (amount > 0) {
     std::lock_guard<std::mutex> guard(m_mutex);
     if (updated_detail)
-      m_details = std::move(updated_detail.value());
+      m_progress_data.details = std::move(updated_detail.value());
     // Watch out for unsigned overflow and make sure we don't increment too
-    // much and exceed m_total.
-    if (m_total && (amount > (m_total - m_completed)))
-      m_completed = m_total;
+    // much and exceed the total.
+    if (m_progress_data.total &&
+        (amount > (m_progress_data.total - m_progress_data.completed)))
+      m_progress_data.completed = m_progress_data.total;
     else
-      m_completed += amount;
+      m_progress_data.completed += amount;
     ReportProgress();
   }
 }
@@ -62,9 +71,11 @@ void Progress::ReportProgress() {
   if (!m_complete) {
     // Make sure we only send one notification that indicates the progress is
     // complete
-    m_complete = m_completed == m_total;
-    Debugger::ReportProgress(m_id, m_title, m_details, m_completed, m_total,
-                             m_debugger_id);
+    m_complete = m_progress_data.completed == m_progress_data.total;
+    Debugger::ReportProgress(m_progress_data.progress_id, m_progress_data.title,
+                             m_progress_data.details, m_progress_data.completed,
+                             m_progress_data.total,
+                             m_progress_data.debugger_id);
   }
 }
 
@@ -82,20 +93,42 @@ ProgressManager &ProgressManager::Instance() {
   return *g_progress_manager;
 }
 
-void ProgressManager::Increment(std::string title) {
+void ProgressManager::Increment(const Progress::ProgressData &progress_data) {
   std::lock_guard<std::mutex> lock(m_progress_map_mutex);
-  m_progress_category_map[title]++;
+  // If the current category exists in the map then it is not an initial report,
+  // therefore don't broadcast to the category bit. Also, store the current
+  // progress data in the map so that we have a note of the ID used for the
+  // initial progress report.
+  if (!m_progress_category_map.contains(progress_data.title)) {
+    m_progress_category_map[progress_data.title].second = progress_data;
+    ReportProgress(progress_data);
+  }
+  m_progress_category_map[progress_data.title].first++;
 }
 
-void ProgressManager::Decrement(std::string title) {
+void ProgressManager::Decrement(const Progress::ProgressData &progress_data) {
   std::lock_guard<std::mutex> lock(m_progress_map_mutex);
-  auto pos = m_progress_category_map.find(title);
+  auto pos = m_progress_category_map.find(progress_data.title);
 
   if (pos == m_progress_category_map.end())
     return;
 
-  if (pos->second <= 1)
-    m_progress_category_map.erase(title);
-  else
-    --pos->second;
+  if (pos->second.first <= 1) {
+    ReportProgress(progress_data);
+    m_progress_category_map.erase(progress_data.title);
+  } else {
+    --pos->second.first;
+  }
+}
+
+void ProgressManager::ReportProgress(Progress::ProgressData progress_data) {
+  // The category bit only keeps track of when progress report categories have
+  // started and ended, so clear the details and other fields when broadcasting
+  // to it since that bit doesn't need that information.
+
+  Debugger::ReportProgress(
+      m_progress_category_map[progress_data.title].second.progress_id,
+      progress_data.title, "", Progress::kNonDeterministicTotal,
+      Progress::kNonDeterministicTotal, progress_data.debugger_id,
+      Debugger::eBroadcastBitProgressCategory);
 }