[Lldb-commits] [lldb] [LLDB][Data Formatters] Calculate average and total time for summary providers within lldb (PR #102708)

[Greg Clayton via lldb-commits]

================
@@ -174,6 +176,85 @@ struct StatisticsOptions {
   std::optional<bool> m_include_transcript;
 };
 
+/// A class that represents statistics about a TypeSummaryProviders invocations
+class SummaryStatistics {
+public:
+  explicit SummaryStatistics(std::string name, std::string impl_type)
+      : m_total_time(), m_impl_type(impl_type), m_name(name),
+        m_count(0) {}
+
+  std::string GetName() const { return m_name; };
+  double GetTotalTime() const { return m_total_time.get().count(); }
+
+  uint64_t GetSummaryCount() const {
+    return m_count.load(std::memory_order_relaxed);
+  }
+
+  StatsDuration &GetDurationReference() { return m_total_time; };
+
+  std::string GetSummaryKindName() const { return m_impl_type; }
+
+  llvm::json::Value ToJSON() const;
+
+
+  /// Basic RAII class to increment the summary count when the call is complete.
+  class SummaryInvocation{
+  public:
+    SummaryInvocation(std::shared_ptr<SummaryStatistics> summary_stats)
+        : m_stats(summary_stats),
+          m_elapsed_time(summary_stats->GetDurationReference()) {}
+    ~SummaryInvocation() { m_stats->OnInvoked(); }
+
+    /// Delete the copy constructor and assignment operator to prevent
+    /// accidental double counting.
+    /// @{
+    SummaryInvocation(const SummaryInvocation &) = delete;
+    SummaryInvocation &operator=(const SummaryInvocation &) = delete;
+    /// @}
+
+  private:
+    std::shared_ptr<SummaryStatistics> m_stats;
+    ElapsedTime m_elapsed_time;
+  };
+
+private:
+  void OnInvoked() noexcept {
+    m_count.fetch_add(1, std::memory_order_relaxed);
+  }
+  lldb_private::StatsDuration m_total_time;
+  std::string m_impl_type;
+  std::string m_name;
+  std::atomic<uint64_t> m_count;
+};
+
+typedef std::shared_ptr<SummaryStatistics> SummaryStatisticsSP;
----------------
clayborg wrote:

Move this above the `SummaryStatistics` class by doing:
```
class SummaryStatistics;
typedef std::shared_ptr<SummaryStatistics> SummaryStatisticsSP;
```
then use SummaryStatisticsSP in the class instead of manually typing `std::shared_ptr<SummaryStatistics>`

https://github.com/llvm/llvm-project/pull/102708