Fixing Heap::Available() to return total of all spaces.

src/heap/heap.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 209 matching lines @@
   intptr_t current_committed_memory = CommittedMemory();
   if (current_committed_memory > maximum_committed_) {
     maximum_committed_ = current_committed_memory;
   }
 }
 
 
 intptr_t Heap::Available() {
   if (!HasBeenSetUp()) return 0;
 
-  return new_space_.Available() + old_space_->Available() +
-         code_space_->Available() + map_space_->Available();
+  intptr_t total = 0;
+  AllSpaces spaces(this);
+  for (Space* space = spaces.next(); space != NULL; space = spaces.next()) {
+    total += space->Available();
+  }
+  return total;
 }
 
 
 bool Heap::HasBeenSetUp() {
   return old_space_ != NULL && code_space_ != NULL && map_space_ != NULL &&
          lo_space_ != NULL;
 }
 
 
 int Heap::GcSafeSizeOfOldObject(HeapObject* object) {
@@ skipping 6261 matching lines @@
       }
       delete list;
     } else {
       prev = list;
     }
     list = next;
   }
 }
 }
 }  // namespace v8::internal