[bootstrapper] no longer use outdated contexts list.

src/snapshot/serialize.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/snapshot/serialize.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 543 matching lines @@
   ExtraNatives::UpdateSourceCache(isolate_->heap());
   CodeStubNatives::UpdateSourceCache(isolate_->heap());
 
   // Issue code events for newly deserialized code objects.
   LOG_CODE_EVENT(isolate_, LogCodeObjects());
   LOG_CODE_EVENT(isolate_, LogCompiledFunctions());
 }
 
 
 MaybeHandle<Object> Deserializer::DeserializePartial(
-    Isolate* isolate, Handle<JSGlobalProxy> global_proxy,
-    Handle<FixedArray>* outdated_contexts_out) {
+    Isolate* isolate, Handle<JSGlobalProxy> global_proxy) {
   Initialize(isolate);
   if (!ReserveSpace()) {
     V8::FatalProcessOutOfMemory("deserialize context");
     return MaybeHandle<Object>();
   }
 
   Vector<Handle<Object> > attached_objects = Vector<Handle<Object> >::New(1);
   attached_objects[kGlobalProxyReference] = global_proxy;
   SetAttachedObjects(attached_objects);
 
   DisallowHeapAllocation no_gc;
   // Keep track of the code space start and end pointers in case new
   // code objects were unserialized
   OldSpace* code_space = isolate_->heap()->code_space();
   Address start_address = code_space->top();
   Object* root;
-  Object* outdated_contexts;
   VisitPointer(&root);
   DeserializeDeferredObjects();
-  VisitPointer(&outdated_contexts);
 
   // There's no code deserialized here. If this assert fires then that's
   // changed and logging should be added to notify the profiler et al of the
   // new code, which also has to be flushed from instruction cache.
   CHECK_EQ(start_address, code_space->top());
-  CHECK(outdated_contexts->IsFixedArray());
-  *outdated_contexts_out =
-      Handle<FixedArray>(FixedArray::cast(outdated_contexts), isolate);
   return Handle<Object>(root, isolate);
 }
 
 
 MaybeHandle<SharedFunctionInfo> Deserializer::DeserializeCode(
     Isolate* isolate) {
   Initialize(isolate);
   if (!ReserveSpace()) {
     return Handle<SharedFunctionInfo>();
   } else {
@@ skipping 873 matching lines @@
     // it before serializing, it will get re-added to the context list
     // explicitly when it's loaded.
     if (context->IsNativeContext()) {
       context->set(Context::NEXT_CONTEXT_LINK,
                    isolate_->heap()->undefined_value());
       DCHECK(!context->global_object()->IsUndefined());
     }
   }
   VisitPointer(o);
   SerializeDeferredObjects();
-  SerializeOutdatedContextsAsFixedArray();
   Pad();
 }
 
 
-void PartialSerializer::SerializeOutdatedContextsAsFixedArray() {
-  int length = outdated_contexts_.length();
-  if (length == 0) {
-    FixedArray* empty = isolate_->heap()->empty_fixed_array();
-    SerializeObject(empty, kPlain, kStartOfObject, 0);
-  } else {
-    // Serialize an imaginary fixed array containing outdated contexts.
-    int size = FixedArray::SizeFor(length);
-    Allocate(NEW_SPACE, size);
-    sink_->Put(kNewObject + NEW_SPACE, "emulated FixedArray");
-    sink_->PutInt(size >> kObjectAlignmentBits, "FixedArray size in words");
-    Map* map = isolate_->heap()->fixed_array_map();
-    SerializeObject(map, kPlain, kStartOfObject, 0);
-    Smi* length_smi = Smi::FromInt(length);
-    sink_->Put(kOnePointerRawData, "Smi");
-    for (int i = 0; i < kPointerSize; i++) {
-      sink_->Put(reinterpret_cast<byte*>(&length_smi)[i], "Byte");
-    }
-    for (int i = 0; i < length; i++) {
-      Context* context = outdated_contexts_[i];
-      BackReference back_reference = back_reference_map_.Lookup(context);
-      sink_->Put(kBackref + back_reference.space(), "BackRef");
-      PutBackReference(context, back_reference);
-    }
-  }
-}
-
-
 bool Serializer::ShouldBeSkipped(Object** current) {
   Object** roots = isolate()->heap()->roots_array_start();
   return current == &roots[Heap::kStoreBufferTopRootIndex]
       || current == &roots[Heap::kStackLimitRootIndex]
       || current == &roots[Heap::kRealStackLimitRootIndex];
 }
 
 
 void Serializer::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
@@ skipping 315 matching lines @@
 
   // Clear literal boilerplates.
   if (obj->IsJSFunction() && !JSFunction::cast(obj)->shared()->bound()) {
     FixedArray* literals = JSFunction::cast(obj)->literals();
     for (int i = 0; i < literals->length(); i++) literals->set_undefined(i);
   }
 
   // Object has not yet been serialized.  Serialize it here.
   ObjectSerializer serializer(this, obj, sink_, how_to_code, where_to_point);
   serializer.Serialize();
-
-  // TODO(yangguo): We probably only need ScriptContext here for post-
-  // processing in Genesis::HookUpGlobalThisBinding.
-  if (obj->IsContext() &&
-      Context::cast(obj)->global_object() == global_object_) {
-    // Context refers to the current global object. This reference will
-    // become outdated after deserialization.
-    outdated_contexts_.Add(Context::cast(obj));
-  }
 }
 
 
 void Serializer::ObjectSerializer::SerializePrologue(AllocationSpace space,
                                                      int size, Map* map) {
   if (serializer_->code_address_map_) {
     const char* code_name =
         serializer_->code_address_map_->Lookup(object_->address());
     LOG(serializer_->isolate_,
         CodeNameEvent(object_->address(), sink_->Position(), code_name));
@@ skipping 984 matching lines @@
   SerializedCodeData* scd = new SerializedCodeData(cached_data);
   SanityCheckResult r = scd->SanityCheck(isolate, source);
   if (r == CHECK_SUCCESS) return scd;
   cached_data->Reject();
   source->GetIsolate()->counters()->code_cache_reject_reason()->AddSample(r);
   delete scd;
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8