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 V8_EXPORT_PRIVATE 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,
      37             :                                          HeapObject obj);
      38             : 
      39             :   // Adds |obj| to the partial snapshot object cache if not already present and
      40             :   // emits a PartialSnapshotCache bytecode into |sink|.
      41             :   void SerializeUsingPartialSnapshotCache(SnapshotByteSink* sink,
      42             :                                           HeapObject obj);
      43             : 
      44             :  private:
      45             :   void SerializeObject(HeapObject o) override;
      46             : 
      47             :   ReadOnlySerializer* read_only_serializer_;
      48             :   std::vector<AccessorInfo> accessor_infos_;
      49             :   std::vector<CallHandlerInfo> call_handler_infos_;
      50             : 
      51             :   DISALLOW_COPY_AND_ASSIGN(StartupSerializer);
      52             : };
      53             : 
      54         392 : class SerializedHandleChecker : public RootVisitor {
      55             :  public:
      56             :   SerializedHandleChecker(Isolate* isolate, std::vector<Context>* contexts);
      57             :   void VisitRootPointers(Root root, const char* description,
      58             :                          FullObjectSlot start, FullObjectSlot end) override;
      59             :   bool CheckGlobalAndEternalHandles();
      60             : 
      61             :  private:
      62             :   void AddToSet(FixedArray serialized);
      63             : 
      64             :   Isolate* isolate_;
      65             :   std::unordered_set<Object, Object::Hasher> serialized_;
      66             :   bool ok_ = true;
      67             : };
      68             : 
      69             : }  // namespace internal
      70             : }  // namespace v8
      71             : 
      72             : #endif  // V8_SNAPSHOT_STARTUP_SERIALIZER_H_