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> |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 9 | #include "include/v8.h" |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 10 | #include "src/snapshot/serializer.h" |
| 11 | |
| 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
| 15 | class StartupSerializer : public Serializer { |
| 16 | public: |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 17 | StartupSerializer( |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 18 | Isolate* isolate, |
| 19 | v8::SnapshotCreator::FunctionCodeHandling function_code_handling); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 20 | ~StartupSerializer() override; |
| 21 | |
| 22 | // Serialize the current state of the heap. The order is: |
| 23 | // 1) Immortal immovable roots |
| 24 | // 2) Remaining strong references. |
| 25 | // 3) Partial snapshot cache. |
| 26 | // 4) Weak references (e.g. the string table). |
| 27 | void SerializeStrongReferences(); |
| 28 | void SerializeWeakReferencesAndDeferred(); |
| 29 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 30 | int PartialSnapshotCacheIndex(HeapObject* o); |
| 31 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 32 | private: |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 33 | class PartialCacheIndexMap : public AddressMapBase { |
| 34 | public: |
| 35 | PartialCacheIndexMap() |
| 36 | : map_(base::HashMap::PointersMatch), next_index_(0) {} |
| 37 | |
| 38 | // Lookup object in the map. Return its index if found, or create |
| 39 | // a new entry with new_index as value, and return kInvalidIndex. |
| 40 | bool LookupOrInsert(HeapObject* obj, int* index_out) { |
| 41 | base::HashMap::Entry* entry = LookupEntry(&map_, obj, false); |
| 42 | if (entry != NULL) { |
| 43 | *index_out = GetValue(entry); |
| 44 | return true; |
| 45 | } |
| 46 | *index_out = next_index_; |
| 47 | SetValue(LookupEntry(&map_, obj, true), next_index_++); |
| 48 | return false; |
| 49 | } |
| 50 | |
| 51 | private: |
| 52 | base::HashMap map_; |
| 53 | int next_index_; |
| 54 | |
| 55 | DISALLOW_COPY_AND_ASSIGN(PartialCacheIndexMap); |
| 56 | }; |
| 57 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 58 | // The StartupSerializer has to serialize the root array, which is slightly |
| 59 | // different. |
| 60 | void VisitPointers(Object** start, Object** end) override; |
| 61 | void SerializeObject(HeapObject* o, HowToCode how_to_code, |
| 62 | WhereToPoint where_to_point, int skip) override; |
| 63 | void Synchronize(VisitorSynchronization::SyncTag tag) override; |
| 64 | |
| 65 | // Some roots should not be serialized, because their actual value depends on |
| 66 | // absolute addresses and they are reset after deserialization, anyway. |
| 67 | // In the first pass over the root list, we only serialize immortal immovable |
| 68 | // roots. In the second pass, we serialize the rest. |
| 69 | bool RootShouldBeSkipped(int root_index); |
| 70 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 71 | bool clear_function_code_; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 72 | bool serializing_builtins_; |
| 73 | bool serializing_immortal_immovables_roots_; |
| 74 | std::bitset<Heap::kStrongRootListLength> root_has_been_serialized_; |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 75 | PartialCacheIndexMap partial_cache_index_map_; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 76 | DISALLOW_COPY_AND_ASSIGN(StartupSerializer); |
| 77 | }; |
| 78 | |
| 79 | } // namespace internal |
| 80 | } // namespace v8 |
| 81 | |
| 82 | #endif // V8_SNAPSHOT_STARTUP_SERIALIZER_H_ |