Print out how many AllocationMementos were found during mark-sweep.

Moreover use the right memory boundary for AllocationMemento lookup during gc.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/25655004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17069 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap-inl.h

@@ -525,11 +525,10 @@ void Heap::ScavengeObject(HeapObject** p, HeapObject* object) {
     return;
   }
 
-  if (FLAG_trace_track_allocation_sites &&
-      AllocationSite::CanTrack(object->map()->instance_type()) &&
-      object->IsJSObject()) {
-    if (AllocationMemento::FindForJSObject(JSObject::cast(object)) != NULL) {
-      object->GetIsolate()->heap()->allocation_mementos_found_on_scavenge_++;
+  if (FLAG_trace_track_allocation_sites && object->IsJSObject()) {
+    if (AllocationMemento::FindForJSObject(JSObject::cast(object), true) !=
+        NULL) {
+      object->GetIsolate()->heap()->allocation_mementos_found_++;
     }
   }
 

src/heap.cc

@@ -86,7 +86,7 @@ Heap::Heap()
       contexts_disposed_(0),
       global_ic_age_(0),
       flush_monomorphic_ics_(false),
-      allocation_mementos_found_on_scavenge_(0),
+      allocation_mementos_found_(0),
       scan_on_scavenge_pages_(0),
       new_space_(this),
       old_pointer_space_(NULL),
@@ -1329,7 +1329,7 @@ class ScavengeWeakObjectRetainer : public WeakObjectRetainer {
 void Heap::Scavenge() {
   RelocationLock relocation_lock(this);
 
-  allocation_mementos_found_on_scavenge_ = 0;
+  allocation_mementos_found_ = 0;
 
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) VerifyNonPointerSpacePointers(this);
@@ -1479,10 +1479,9 @@ void Heap::Scavenge() {
 
   scavenges_since_last_idle_round_++;
 
-  if (FLAG_trace_track_allocation_sites &&
-      allocation_mementos_found_on_scavenge_ > 0) {
+  if (FLAG_trace_track_allocation_sites && allocation_mementos_found_ > 0) {
     PrintF("AllocationMementos found during scavenge = %d\n",
-           allocation_mementos_found_on_scavenge_);
+           allocation_mementos_found_);
   }
 }
 

src/heap.h

@@ -1886,8 +1886,8 @@ class Heap {
 
   bool flush_monomorphic_ics_;
 
-  // AllocationMementos found on scavenge.
-  int allocation_mementos_found_on_scavenge_;
+  // AllocationMementos found in new space.
+  int allocation_mementos_found_;
 
   int scan_on_scavenge_pages_;
 

src/mark-compact.cc

@@ -407,6 +407,8 @@ void MarkCompactCollector::CollectGarbage() {
   ASSERT(state_ == PREPARE_GC);
   ASSERT(encountered_weak_collections_ == Smi::FromInt(0));
 
+  heap()->allocation_mementos_found_ = 0;
+
   MarkLiveObjects();
   ASSERT(heap_->incremental_marking()->IsStopped());
 
@@ -449,6 +451,11 @@ void MarkCompactCollector::CollectGarbage() {
     marking_parity_ = EVEN_MARKING_PARITY;
   }
 
+  if (FLAG_trace_track_allocation_sites &&
+      heap()->allocation_mementos_found_ > 0) {
+    PrintF("AllocationMementos found during mark-sweep = %d\n",
+           heap()->allocation_mementos_found_);
+  }
   tracer_ = NULL;
 }
 
@@ -2002,6 +2009,13 @@ int MarkCompactCollector::DiscoverAndPromoteBlackObjectsOnPage(
       int size = object->Size();
       survivors_size += size;
 
+      if (FLAG_trace_track_allocation_sites && object->IsJSObject()) {
+        if (AllocationMemento::FindForJSObject(JSObject::cast(object), true)
+            != NULL) {
+          heap()->allocation_mementos_found_++;
+        }
+      }
+
       offset++;
       current_cell >>= 1;
       // Aggressively promote young survivors to the old space.

src/objects.cc

@@ -9049,7 +9049,8 @@ Handle<String> SeqString::Truncate(Handle<SeqString> string, int new_length) {
 }
 
 
-AllocationMemento* AllocationMemento::FindForJSObject(JSObject* object) {
+AllocationMemento* AllocationMemento::FindForJSObject(JSObject* object,
+                                                      bool in_GC) {
   // Currently, AllocationMemento objects are only allocated immediately
   // after JSArrays in NewSpace, and detecting whether a JSArray has one
   // involves carefully checking the object immediately after the JSArray
@@ -9057,8 +9058,13 @@ AllocationMemento* AllocationMemento::FindForJSObject(JSObject* object) {
   if (FLAG_track_allocation_sites && object->GetHeap()->InNewSpace(object)) {
     Address ptr_end = (reinterpret_cast<Address>(object) - kHeapObjectTag) +
         object->Size();
-    if ((ptr_end + AllocationMemento::kSize) <=
-        object->GetHeap()->NewSpaceTop()) {
+    Address top;
+    if (in_GC) {
+      top = object->GetHeap()->new_space()->FromSpacePageHigh();
+    } else {
+      top = object->GetHeap()->NewSpaceTop();
+    }
+    if ((ptr_end + AllocationMemento::kSize) <= top) {
       // There is room in newspace for allocation info. Do we have some?
       Map** possible_allocation_memento_map =
           reinterpret_cast<Map**>(ptr_end);

src/objects.h

@@ -7889,7 +7889,8 @@ class AllocationMemento: public Struct {
   DECLARE_VERIFIER(AllocationMemento)
 
   // Returns NULL if no AllocationMemento is available for object.
-  static AllocationMemento* FindForJSObject(JSObject* object);
+  static AllocationMemento* FindForJSObject(JSObject* object,
+                                            bool in_GC = false);
   static inline AllocationMemento* cast(Object* obj);
 
  private: