Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 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 <bitset> |
| 9 | #include "src/snapshot/serializer.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | |
| 14 | class StartupSerializer : public Serializer { |
| 15 | public: |
| 16 | enum FunctionCodeHandling { CLEAR_FUNCTION_CODE, KEEP_FUNCTION_CODE }; |
| 17 | |
| 18 | StartupSerializer( |
| 19 | Isolate* isolate, SnapshotByteSink* sink, |
| 20 | FunctionCodeHandling function_code_handling = CLEAR_FUNCTION_CODE); |
| 21 | ~StartupSerializer() override; |
| 22 | |
| 23 | // Serialize the current state of the heap. The order is: |
| 24 | // 1) Immortal immovable roots |
| 25 | // 2) Remaining strong references. |
| 26 | // 3) Partial snapshot cache. |
| 27 | // 4) Weak references (e.g. the string table). |
| 28 | void SerializeStrongReferences(); |
| 29 | void SerializeWeakReferencesAndDeferred(); |
| 30 | |
| 31 | private: |
| 32 | // The StartupSerializer has to serialize the root array, which is slightly |
| 33 | // different. |
| 34 | void VisitPointers(Object** start, Object** end) override; |
| 35 | void SerializeObject(HeapObject* o, HowToCode how_to_code, |
| 36 | WhereToPoint where_to_point, int skip) override; |
| 37 | void Synchronize(VisitorSynchronization::SyncTag tag) override; |
| 38 | |
| 39 | // Some roots should not be serialized, because their actual value depends on |
| 40 | // absolute addresses and they are reset after deserialization, anyway. |
| 41 | // In the first pass over the root list, we only serialize immortal immovable |
| 42 | // roots. In the second pass, we serialize the rest. |
| 43 | bool RootShouldBeSkipped(int root_index); |
| 44 | |
| 45 | FunctionCodeHandling function_code_handling_; |
| 46 | bool serializing_builtins_; |
| 47 | bool serializing_immortal_immovables_roots_; |
| 48 | std::bitset<Heap::kStrongRootListLength> root_has_been_serialized_; |
| 49 | DISALLOW_COPY_AND_ASSIGN(StartupSerializer); |
| 50 | }; |
| 51 | |
| 52 | } // namespace internal |
| 53 | } // namespace v8 |
| 54 | |
| 55 | #endif // V8_SNAPSHOT_STARTUP_SERIALIZER_H_ |