Version 2.1.2.7...

src/heap.cc

 // Copyright 2009 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 97 matching lines @@
 int Heap::survived_since_last_expansion_ = 0;
 int Heap::external_allocation_limit_ = 0;
 
 Heap::HeapState Heap::gc_state_ = NOT_IN_GC;
 
 int Heap::mc_count_ = 0;
 int Heap::gc_count_ = 0;
 
 int Heap::always_allocate_scope_depth_ = 0;
 int Heap::linear_allocation_scope_depth_ = 0;
+
 int Heap::contexts_disposed_ = 0;
+bool Heap::context_disposed_use_deprecated_heuristic_ = true;
+bool Heap::context_disposed_deprecated_pending_ = false;
 
 #ifdef DEBUG
 bool Heap::allocation_allowed_ = true;
 
 int Heap::allocation_timeout_ = 0;
 bool Heap::disallow_allocation_failure_ = false;
 #endif  // DEBUG
 
 
 int Heap::Capacity() {
@@ skipping 235 matching lines @@
 void Heap::CollectAllGarbage(bool force_compaction) {
   // Since we are ignoring the return value, the exact choice of space does
   // not matter, so long as we do not specify NEW_SPACE, which would not
   // cause a full GC.
   MarkCompactCollector::SetForceCompaction(force_compaction);
   CollectGarbage(0, OLD_POINTER_SPACE);
   MarkCompactCollector::SetForceCompaction(false);
 }
 
 
+void Heap::CollectAllGarbageIfContextDisposedDeprecated() {
+  if (!context_disposed_use_deprecated_heuristic_) return;
+  // If the garbage collector interface is exposed through the global
+  // gc() function, we avoid being clever about forcing GCs when
+  // contexts are disposed and leave it to the embedder to make
+  // informed decisions about when to force a collection.
+  if (!FLAG_expose_gc && context_disposed_deprecated_pending_) {
+    HistogramTimerScope scope(&Counters::gc_context);
+    CollectAllGarbage(false);
+  }
+  context_disposed_deprecated_pending_ = false;
+}
+
+
 void Heap::NotifyContextDisposed() {
+  context_disposed_use_deprecated_heuristic_ = false;
   contexts_disposed_++;
 }
 
 
+void Heap::NotifyContextDisposedDeprecated() {
+  if (!context_disposed_use_deprecated_heuristic_) return;
+  context_disposed_deprecated_pending_ = true;
+}
+
+
 bool Heap::CollectGarbage(int requested_size, AllocationSpace space) {
   // The VM is in the GC state until exiting this function.
   VMState state(GC);
 
 #ifdef DEBUG
   // Reset the allocation timeout to the GC interval, but make sure to
   // allow at least a few allocations after a collection. The reason
   // for this is that we have a lot of allocation sequences and we
   // assume that a garbage collection will allow the subsequent
   // allocation attempts to go through.
@@ skipping 213 matching lines @@
 
   LOG(ResourceEvent("markcompact", "end"));
 
   gc_state_ = NOT_IN_GC;
 
   Shrink();
 
   Counters::objs_since_last_full.Set(0);
 
   contexts_disposed_ = 0;
+  context_disposed_deprecated_pending_ = false;
 }
 
 
 void Heap::MarkCompactPrologue(bool is_compacting) {
   // At any old GC clear the keyed lookup cache to enable collection of unused
   // maps.
   KeyedLookupCache::Clear();
   ContextSlotCache::Clear();
   DescriptorLookupCache::Clear();
 
@@ skipping 3592 matching lines @@
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 List<Object*> ExternalStringTable::new_space_strings_;
 List<Object*> ExternalStringTable::old_space_strings_;
 
 } }  // namespace v8::internal