Support for extracting user-data from activity tracking.

base/debug/activity_analyzer.h

Index: base/debug/activity_analyzer.h
diff --git a/base/debug/activity_analyzer.h b/base/debug/activity_analyzer.h
index 0a527332a62d0253b67a203290778349d3fec6ac..fb4df6fcd24ba630354cf13f0d38c2fd15067a3a 100644
--- a/base/debug/activity_analyzer.h
+++ b/base/debug/activity_analyzer.h
@@ -16,6 +16,8 @@
 namespace base {
 namespace debug {
 
+class GlobalActivityAnalyzer;
+
 // This class provides analysis of data captured from a ThreadActivityTracker.
 // When created, it takes a snapshot of the data held by the tracker and
 // makes that information available to other code.
@@ -59,6 +61,9 @@ class BASE_EXPORT ThreadActivityAnalyzer {
 
   ~ThreadActivityAnalyzer();
 
+  // Adds information from the global analyzer.
+  void AddGlobalInformation(GlobalActivityAnalyzer* global);
+
   // Returns true iff the contained data is valid. Results from all other
   // methods are undefined if this returns false.
   bool IsValid() { return activity_snapshot_valid_; }
@@ -74,6 +79,11 @@ class BASE_EXPORT ThreadActivityAnalyzer {
                      activity_snapshot_.thread_id);
   }
 
+  // Gets the user-data snapshot for an activity based on its index in the
+  // |activity_stack| field of the ActivitySnapshot. Ownership stays with
+  // this instance.
+  const ActivityUserData::Snapshot& GetUserDataSnapshot(size_t stack_index);
+
   const ActivitySnapshot& activity_snapshot() { return activity_snapshot_; }
 
  private:
@@ -85,6 +95,10 @@ class BASE_EXPORT ThreadActivityAnalyzer {
   // Flag indicating if the snapshot data is valid.
   bool activity_snapshot_valid_;
 
+  // Copy of user-data associated with the stack. This is captured and held
+  // because the data may change if used on a live system.
+  std::vector<ActivityUserData::Snapshot> user_data_snapshots_;
+
   // A reference into a persistent memory allocator, used by the global
   // analyzer to know where this tracker came from.
   PersistentMemoryAllocator::Reference allocator_reference_ = 0;
@@ -132,6 +146,12 @@ class BASE_EXPORT GlobalActivityAnalyzer {
   // Ownership stays with the global analyzer object.
   ThreadActivityAnalyzer* GetAnalyzerForThread(const ThreadKey& key);
 
+  // Extract user data based on a reference and its identifier.
+  ActivityUserData::Snapshot GetUserDataSnapshot(uint32_t ref, uint32_t id);
+
+  // Extract the global user data.
+  ActivityUserData::Snapshot GetGlobalUserDataSnapshot();
+
   // Gets the corresponding "program location" for a given "program counter".
   // This will return {0,0} if no mapping could be found.
   ProgramLocation GetProgramLocationFromAddress(uint64_t address);