Prototype of mark-and-compact support for Harmony weak maps.

src/heap.h

 // Copyright 2011 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
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@@ skipping 114 matching lines @@
   V(NumberDictionary, code_stubs, CodeStubs)                                   \
   V(NumberDictionary, non_monomorphic_cache, NonMonomorphicCache)              \
   V(PolymorphicCodeCache, polymorphic_code_cache, PolymorphicCodeCache)        \
   V(Code, js_entry_code, JsEntryCode)                                          \
   V(Code, js_construct_entry_code, JsConstructEntryCode)                       \
   V(FixedArray, natives_source_cache, NativesSourceCache)                      \
   V(Object, last_script_id, LastScriptId)                                      \
   V(Script, empty_script, EmptyScript)                                         \
   V(Smi, real_stack_limit, RealStackLimit)                                     \
   V(StringDictionary, intrinsic_function_names, IntrinsicFunctionNames)        \
+  V(Object, encountered_weak_maps, EncounteredWeakMaps)                        \

[Vyacheslav Egorov (Chromium), 2011/08/02 16:32:00]

Do we really need a separate root for this list?

I think just a field on the Heap or MarkCompactCollector should be enough.

[Michael Starzinger, 2011/08/03 08:47:05]

Done. I made it into a root to have the list available for shrinking of tables
after the GC (including a possible compaction) finished. But we do not yet
shrink anyways, so no need for it to be a root.

 
 #define ROOT_LIST(V)                                  \
   STRONG_ROOT_LIST(V)                                 \
   V(SymbolTable, symbol_table, SymbolTable)
 
 #define SYMBOL_LIST(V)                                                   \
   V(Array_symbol, "Array")                                               \
   V(Object_symbol, "Object")                                             \
   V(Proto_symbol, "__proto__")                                           \
   V(StringImpl_symbol, "StringImpl")                                     \
@@ skipping 1494 matching lines @@
   bool is_safe_to_read_maps_;
 
   friend class Factory;
   friend class GCTracer;
   friend class DisallowAllocationFailure;
   friend class AlwaysAllocateScope;
   friend class LinearAllocationScope;
   friend class Page;
   friend class Isolate;
   friend class MarkCompactCollector;
+  friend class StaticMarkingVisitor;
   friend class MapCompact;
 
   DISALLOW_COPY_AND_ASSIGN(Heap);
 };
 
 
 class HeapStats {
  public:
   static const int kStartMarker = 0xDECADE00;
   static const int kEndMarker = 0xDECADE01;
@@ skipping 646 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_