Attempt to collect more garbage before panicking with out of memory.

src/heap.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 687 matching lines @@
   static Object* ToBoolean(bool condition) {
     return condition ? true_value() : false_value();
   }
 
   // Code that should be run before and after each GC.  Includes some
   // reporting/verification activities when compiled with DEBUG set.
   static void GarbageCollectionPrologue();
   static void GarbageCollectionEpilogue();
 
   // Performs garbage collection operation.
-  // Returns whether required_space bytes are available after the collection.
-  static void CollectGarbage(AllocationSpace space);
+  // Returns whether there is a chance that another major GC could
+  // collect more garbage.
+  static bool CollectGarbage(AllocationSpace space, GarbageCollector collector);
+
+  // Performs garbage collection operation.
+  // Returns whether there is a chance that another major GC could
+  // collect more garbage.
+  inline static bool CollectGarbage(AllocationSpace space);
 
   // Performs a full garbage collection. Force compaction if the
   // parameter is true.
   static void CollectAllGarbage(bool force_compaction);
 
+  // Last hope GC, should try to squeeze as much as possible.
+  static void CollectAllAvailableGarbage();
+
   // Notify the heap that a context has been disposed.
   static int NotifyContextDisposed() { return ++contexts_disposed_; }
 
   // Utility to invoke the scavenger. This is needed in test code to
   // ensure correct callback for weak global handles.
   static void PerformScavenge();
 
 #ifdef DEBUG
   // Utility used with flag gc-greedy.
   static void GarbageCollectionGreedyCheck();
@@ skipping 514 matching lines @@
   static void MarkMapPointersAsEncoded(bool encoded) {
     gc_safe_size_of_old_object_ = encoded
         ? &GcSafeSizeOfOldObjectWithEncodedMap
         : &GcSafeSizeOfOldObject;
   }
 
   // Checks whether a global GC is necessary
   static GarbageCollector SelectGarbageCollector(AllocationSpace space);
 
   // Performs garbage collection
-  static void PerformGarbageCollection(GarbageCollector collector,
+  // Returns whether there is a chance another major GC could
+  // collect more garbage.
+  static bool PerformGarbageCollection(GarbageCollector collector,
                                        GCTracer* tracer);
 
   // Allocate an uninitialized object in map space.  The behavior is identical
   // to Heap::AllocateRaw(size_in_bytes, MAP_SPACE), except that (a) it doesn't
   // have to test the allocation space argument and (b) can reduce code size
   // (since both AllocateRaw and AllocateRawMap are inlined).
   MUST_USE_RESULT static inline MaybeObject* AllocateRawMap();
 
   // Allocate an uninitialized object in the global property cell space.
   MUST_USE_RESULT static inline MaybeObject* AllocateRawCell();
@@ skipping 807 matching lines @@
   // Return whether this object should be retained. If NULL is returned the
   // object has no references. Otherwise the address of the retained object
   // should be returned as in some GC situations the object has been moved.
   virtual Object* RetainAs(Object* object) = 0;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_