Improve invalid root dumping.

The invalid root dumping now attempts to print the root type.

Change-Id: Ie821296d569f34909ba6e2705f5c347cd2143a3a

3 files changed, 13 insertions, 10 deletions

diff --git a/runtime/gc/collector/mark_sweep.cc b/runtime/gc/collector/mark_sweep.cc
index ca2d0bd..944ef8d 100644
--- a/runtime/gc/collector/mark_sweep.cc
+++ b/runtime/gc/collector/mark_sweep.cc
@@ -76,7 +76,7 @@ static constexpr bool kCountMarkedObjects = false;
 
 // Turn off kCheckLocks when profiling the GC since it slows the GC down by up to 40%.
 static constexpr bool kCheckLocks = kDebugLocking;
-static constexpr bool kVerifyRoots = kIsDebugBuild;
+static constexpr bool kVerifyRootsMarked = kIsDebugBuild;
 
 // If true, revoke the rosalloc thread-local buffers at the
 // checkpoint, as opposed to during the pause.
@@ -466,16 +466,17 @@ void MarkSweep::MarkRootCallback(Object** root, void* arg, uint32_t /*thread_id*
 }
 
 void MarkSweep::VerifyRootCallback(const Object* root, void* arg, size_t vreg,
-                                   const StackVisitor* visitor) {
-  reinterpret_cast<MarkSweep*>(arg)->VerifyRoot(root, vreg, visitor);
+                                   const StackVisitor* visitor, RootType root_type) {
+  reinterpret_cast<MarkSweep*>(arg)->VerifyRoot(root, vreg, visitor, root_type);
 }
 
-void MarkSweep::VerifyRoot(const Object* root, size_t vreg, const StackVisitor* visitor) {
+void MarkSweep::VerifyRoot(const Object* root, size_t vreg, const StackVisitor* visitor,
+                           RootType root_type) {
   // See if the root is on any space bitmap.
-  if (GetHeap()->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == NULL) {
+  if (GetHeap()->GetLiveBitmap()->GetContinuousSpaceBitmap(root) == nullptr) {
     space::LargeObjectSpace* large_object_space = GetHeap()->GetLargeObjectsSpace();
     if (!large_object_space->Contains(root)) {
-      LOG(ERROR) << "Found invalid root: " << root;
+      LOG(ERROR) << "Found invalid root: " << root << " with type " << root_type;
       if (visitor != NULL) {
         LOG(ERROR) << visitor->DescribeLocation() << " in VReg: " << vreg;
       }
@@ -918,7 +919,7 @@ void MarkSweep::ReMarkRoots() {
                                                           kVisitRootFlagStopLoggingNewRoots |
                                                           kVisitRootFlagClearRootLog));
   timings_.EndSplit();
-  if (kVerifyRoots) {
+  if (kVerifyRootsMarked) {
     timings_.StartSplit("(Paused)VerifyRoots");
     Runtime::Current()->VisitRoots(VerifyRootMarked, this);
     timings_.EndSplit();
diff --git a/runtime/gc/collector/mark_sweep.h b/runtime/gc/collector/mark_sweep.h
index f1fd546..d49e427 100644
--- a/runtime/gc/collector/mark_sweep.h
+++ b/runtime/gc/collector/mark_sweep.h
@@ -249,10 +249,10 @@ class MarkSweep : public GarbageCollector {
   size_t GetThreadCount(bool paused) const;
 
   static void VerifyRootCallback(const mirror::Object* root, void* arg, size_t vreg,
-                                 const StackVisitor *visitor);
+                                 const StackVisitor *visitor, RootType root_type);
 
-  void VerifyRoot(const mirror::Object* root, size_t vreg, const StackVisitor* visitor)
-      NO_THREAD_SAFETY_ANALYSIS;
+  void VerifyRoot(const mirror::Object* root, size_t vreg, const StackVisitor* visitor,
+                  RootType root_type) NO_THREAD_SAFETY_ANALYSIS;
 
   // Push a single reference on a mark stack.
   void PushOnMarkStack(mirror::Object* obj);
diff --git a/runtime/gc/heap.h b/runtime/gc/heap.h
index ffb4e59..a8989ec 100644
--- a/runtime/gc/heap.h
+++ b/runtime/gc/heap.h
@@ -115,6 +115,8 @@ enum ProcessState {
 };
 std::ostream& operator<<(std::ostream& os, const ProcessState& process_state);
 
+std::ostream& operator<<(std::ostream& os, const RootType& root_type);
+
 class Heap {
  public:
   // If true, measure the total allocation time.