Separating transitions from descriptors.

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "execution.h"
 #include "factory.h"
 #include "macro-assembler.h"
 #include "global-handles.h"
@@ skipping 1725 matching lines @@
   CHECK_EQ(4, res->ToObject()->GetRealNamedProperty(v8_str("x"))->Int32Value());
 
   Handle<JSObject> o =
       v8::Utils::OpenHandle(*v8::Handle<v8::Object>::Cast(res));
 
   CHECK(HEAP->InNewSpace(*o));
 }
 
 
 static int CountMapTransitions(Map* map) {
-  int result = 0;
-  DescriptorArray* descs = map->instance_descriptors();
-  for (int i = 0; i < descs->number_of_descriptors(); i++) {
-    if (descs->IsTransitionOnly(i)) {
-      result++;
-    }
-  }
-  return result;
+  return map->transitions()->number_of_transitions();
 }
 
 
 // Test that map transitions are cleared and maps are collected with
 // incremental marking as well.
 TEST(Regress1465) {
   i::FLAG_allow_natives_syntax = true;
   i::FLAG_trace_incremental_marking = true;
   InitializeVM();
   v8::HandleScope scope;
@@ skipping 167 matching lines @@
   HEAP->CollectAllGarbage(Heap::kNoGCFlags, "triggered by test 1");
   CHECK_GE(number_of_test_pages + 1, old_pointer_space->CountTotalPages());
   HEAP->CollectAllGarbage(Heap::kNoGCFlags, "triggered by test 2");
   CHECK_GE(number_of_test_pages + 1, old_pointer_space->CountTotalPages() * 2);
 
   // Triggering a last-resort GC should cause all pages to be released
   // to the OS so that other processes can seize the memory.
   HEAP->CollectAllAvailableGarbage("triggered really hard");
   CHECK_EQ(1, old_pointer_space->CountTotalPages());
 }