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| 1 // Copyright 2006-2008 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 #include "src/isolate.h" | |
| 6 #include "src/serialize.h" | |
| 7 | |
| 8 #ifndef V8_SNAPSHOT_H_ | |
| 9 #define V8_SNAPSHOT_H_ | |
| 10 | |
| 11 namespace v8 { | |
| 12 namespace internal { | |
| 13 | |
| 14 class Snapshot : public AllStatic { | |
| 15 public: | |
| 16 class Metadata { | |
| 17 public: | |
| 18 explicit Metadata(uint32_t data = 0) : data_(data) {} | |
| 19 bool embeds_script() { return EmbedsScriptBits::decode(data_); } | |
| 20 void set_embeds_script(bool v) { | |
| 21 data_ = EmbedsScriptBits::update(data_, v); | |
| 22 } | |
| 23 | |
| 24 uint32_t& RawValue() { return data_; } | |
| 25 | |
| 26 private: | |
| 27 class EmbedsScriptBits : public BitField<bool, 0, 1> {}; | |
| 28 uint32_t data_; | |
| 29 }; | |
| 30 | |
| 31 // Initialize the Isolate from the internal snapshot. Returns false if no | |
| 32 // snapshot could be found. | |
| 33 static bool Initialize(Isolate* isolate); | |
| 34 // Create a new context using the internal partial snapshot. | |
| 35 static MaybeHandle<Context> NewContextFromSnapshot( | |
| 36 Isolate* isolate, Handle<JSGlobalProxy> global_proxy, | |
| 37 Handle<FixedArray>* outdated_contexts_out); | |
| 38 | |
| 39 static bool HaveASnapshotToStartFrom(Isolate* isolate) { | |
| 40 // Do not use snapshots if the isolate is used to create snapshots. | |
| 41 return isolate->snapshot_blob() != NULL; | |
| 42 } | |
| 43 | |
| 44 static bool EmbedsScript(Isolate* isolate); | |
| 45 | |
| 46 static uint32_t SizeOfFirstPage(Isolate* isolate, AllocationSpace space); | |
| 47 | |
| 48 | |
| 49 // To be implemented by the snapshot source. | |
| 50 static const v8::StartupData* DefaultSnapshotBlob(); | |
| 51 | |
| 52 static v8::StartupData CreateSnapshotBlob( | |
| 53 const StartupSerializer& startup_ser, | |
| 54 const PartialSerializer& context_ser, Snapshot::Metadata metadata); | |
| 55 | |
| 56 #ifdef DEBUG | |
| 57 static bool SnapshotIsValid(v8::StartupData* snapshot_blob); | |
| 58 #endif // DEBUG | |
| 59 | |
| 60 private: | |
| 61 static Vector<const byte> ExtractStartupData(const v8::StartupData* data); | |
| 62 static Vector<const byte> ExtractContextData(const v8::StartupData* data); | |
| 63 static Metadata ExtractMetadata(const v8::StartupData* data); | |
| 64 | |
| 65 // Snapshot blob layout: | |
| 66 // [0] metadata | |
| 67 // [1 - 6] pre-calculated first page sizes for paged spaces | |
| 68 // [7] serialized start up data length | |
| 69 // ... serialized start up data | |
| 70 // ... serialized context data | |
| 71 | |
| 72 static const int kNumPagedSpaces = LAST_PAGED_SPACE - FIRST_PAGED_SPACE + 1; | |
| 73 | |
| 74 static const int kMetadataOffset = 0; | |
| 75 static const int kFirstPageSizesOffset = kMetadataOffset + kInt32Size; | |
| 76 static const int kStartupLengthOffset = | |
| 77 kFirstPageSizesOffset + kNumPagedSpaces * kInt32Size; | |
| 78 static const int kStartupDataOffset = kStartupLengthOffset + kInt32Size; | |
| 79 | |
| 80 static int ContextOffset(int startup_length) { | |
| 81 return kStartupDataOffset + startup_length; | |
| 82 } | |
| 83 | |
| 84 DISALLOW_IMPLICIT_CONSTRUCTORS(Snapshot); | |
| 85 }; | |
| 86 | |
| 87 #ifdef V8_USE_EXTERNAL_STARTUP_DATA | |
| 88 void SetSnapshotFromFile(StartupData* snapshot_blob); | |
| 89 #endif | |
| 90 | |
| 91 } } // namespace v8::internal | |
| 92 | |
| 93 #endif // V8_SNAPSHOT_H_ | |
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Chromium Code Reviews
Issue 1041743002:
Serializer: move to a subfolder and clean up includes. (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master