[heap] Use HashMap as scratchpad backing store

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1755 matching lines @@
 
 
 int AllocationSite::memento_create_count() { return pretenure_create_count(); }
 
 
 void AllocationSite::set_memento_create_count(int count) {
   set_pretenure_create_count(count);
 }
 
 
-inline bool AllocationSite::IncrementMementoFoundCount() {
+bool AllocationSite::IncrementMementoFoundCount(int increment) {
   if (IsZombie()) return false;
 
   int value = memento_found_count();
-  set_memento_found_count(value + 1);
-  return memento_found_count() == kPretenureMinimumCreated;
+  set_memento_found_count(value + increment);
+  return memento_found_count() >= kPretenureMinimumCreated;
 }
 
 
 inline void AllocationSite::IncrementMementoCreateCount() {
   DCHECK(FLAG_allocation_site_pretenuring);
   int value = memento_create_count();
   set_memento_create_count(value + 1);
 }
 
 
@@ skipping 33 matching lines @@
       minimum_mementos_created || FLAG_trace_pretenuring_statistics ?
           static_cast<double>(found_count) / create_count : 0.0;
   PretenureDecision current_decision = pretenure_decision();
 
   if (minimum_mementos_created) {
     deopt = MakePretenureDecision(
         current_decision, ratio, maximum_size_scavenge);
   }
 
   if (FLAG_trace_pretenuring_statistics) {
-    PrintF(
-        "AllocationSite(%p): (created, found, ratio) (%d, %d, %f) %s => %s\n",
-         static_cast<void*>(this), create_count, found_count, ratio,
-         PretenureDecisionName(current_decision),
-         PretenureDecisionName(pretenure_decision()));
+    PrintIsolate(GetIsolate(),
+                 "pretenuring: AllocationSite(%p): (created, found, ratio) "
+                 "(%d, %d, %f) %s => %s\n",
+                 this, create_count, found_count, ratio,
+                 PretenureDecisionName(current_decision),
+                 PretenureDecisionName(pretenure_decision()));
   }
 
   // Clear feedback calculation fields until the next gc.
   set_memento_found_count(0);
   set_memento_create_count(0);
   return deopt;
 }
 
 
 bool AllocationMemento::IsValid() {
@@ skipping 5945 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_