Line data    Source code

       1             : // Copyright 2016 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_SNAPSHOT_STARTUP_SERIALIZER_H_
       6             : #define V8_SNAPSHOT_STARTUP_SERIALIZER_H_
       7             : 
       8             : #include <unordered_set>
       9             : 
      10             : #include "src/snapshot/roots-serializer.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15             : class HeapObject;
      16             : class SnapshotByteSink;
      17             : class ReadOnlySerializer;
      18             : 
      19             : class StartupSerializer : public RootsSerializer {
      20             :  public:
      21             :   StartupSerializer(Isolate* isolate, ReadOnlySerializer* read_only_serializer);
      22             :   ~StartupSerializer() override;
      23             : 
      24             :   // Serialize the current state of the heap.  The order is:
      25             :   // 1) Strong roots
      26             :   // 2) Builtins and bytecode handlers
      27             :   // 3) Partial snapshot cache
      28             :   // 4) Weak references (e.g. the string table)
      29             :   void SerializeStrongReferences();
      30             :   void SerializeWeakReferencesAndDeferred();
      31             : 
      32             :   // If |obj| can be serialized in the read-only snapshot then add it to the
      33             :   // read-only object cache if not already present and emits a
      34             :   // ReadOnlyObjectCache bytecode into |sink|. Returns whether this was
      35             :   // successful.
      36             :   bool SerializeUsingReadOnlyObjectCache(SnapshotByteSink* sink, HeapObject obj,
      37             :                                          HowToCode how_to_code,
      38             :                                          WhereToPoint where_to_point, int skip);
      39             : 
      40             :   // Adds |obj| to the partial snapshot object cache if not already present and
      41             :   // emits a PartialSnapshotCache bytecode into |sink|.
      42             :   void SerializeUsingPartialSnapshotCache(SnapshotByteSink* sink,
      43             :                                           HeapObject obj, HowToCode how_to_code,
      44             :                                           WhereToPoint where_to_point,
      45             :                                           int skip);
      46             : 
      47             :  private:
      48             :   void SerializeObject(HeapObject o, HowToCode how_to_code,
      49             :                        WhereToPoint where_to_point, int skip) override;
      50             : 
      51             :   ReadOnlySerializer* read_only_serializer_;
      52             :   std::vector<AccessorInfo> accessor_infos_;
      53             :   std::vector<CallHandlerInfo> call_handler_infos_;
      54             : 
      55             :   DISALLOW_COPY_AND_ASSIGN(StartupSerializer);
      56             : };
      57             : 
      58         372 : class SerializedHandleChecker : public RootVisitor {
      59             :  public:
      60             :   SerializedHandleChecker(Isolate* isolate, std::vector<Context>* contexts);
      61             :   void VisitRootPointers(Root root, const char* description,
      62             :                          FullObjectSlot start, FullObjectSlot end) override;
      63             :   bool CheckGlobalAndEternalHandles();
      64             : 
      65             :  private:
      66             :   void AddToSet(FixedArray serialized);
      67             : 
      68             :   Isolate* isolate_;
      69             :   std::unordered_set<Object, Object::Hasher> serialized_;
      70             :   bool ok_ = true;
      71             : };
      72             : 
      73             : }  // namespace internal
      74             : }  // namespace v8
      75             : 
      76             : #endif  // V8_SNAPSHOT_STARTUP_SERIALIZER_H_