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 // The common functionality when building with or without snapshots. 6 7 #include "src/v8.h" 8 9 #include "src/api.h" 10 #include "src/base/platform/platform.h" 11 #include "src/serialize.h" 12 #include "src/snapshot.h" 13 14 namespace v8 { 15 namespace internal { 16 17 void Snapshot::ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer) { 18 deserializer->set_reservation(NEW_SPACE, new_space_used_); 19 deserializer->set_reservation(OLD_POINTER_SPACE, pointer_space_used_); 20 deserializer->set_reservation(OLD_DATA_SPACE, data_space_used_); 21 deserializer->set_reservation(CODE_SPACE, code_space_used_); 22 deserializer->set_reservation(MAP_SPACE, map_space_used_); 23 deserializer->set_reservation(CELL_SPACE, cell_space_used_); 24 deserializer->set_reservation(PROPERTY_CELL_SPACE, 25 property_cell_space_used_); 26 } 27 28 29 bool Snapshot::Initialize(Isolate* isolate) { 30 if (size_ > 0) { 31 base::ElapsedTimer timer; 32 if (FLAG_profile_deserialization) { 33 timer.Start(); 34 } 35 SnapshotByteSource source(raw_data_, raw_size_); 36 Deserializer deserializer(&source); 37 ReserveSpaceForLinkedInSnapshot(&deserializer); 38 bool success = isolate->Init(&deserializer); 39 if (FLAG_profile_deserialization) { 40 double ms = timer.Elapsed().InMillisecondsF(); 41 PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms); 42 } 43 return success; 44 } 45 return false; 46 } 47 48 49 bool Snapshot::HaveASnapshotToStartFrom() { 50 return size_ != 0; 51 } 52 53 54 Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) { 55 if (context_size_ == 0) { 56 return Handle<Context>(); 57 } 58 SnapshotByteSource source(context_raw_data_, 59 context_raw_size_); 60 Deserializer deserializer(&source); 61 Object* root; 62 deserializer.set_reservation(NEW_SPACE, context_new_space_used_); 63 deserializer.set_reservation(OLD_POINTER_SPACE, context_pointer_space_used_); 64 deserializer.set_reservation(OLD_DATA_SPACE, context_data_space_used_); 65 deserializer.set_reservation(CODE_SPACE, context_code_space_used_); 66 deserializer.set_reservation(MAP_SPACE, context_map_space_used_); 67 deserializer.set_reservation(CELL_SPACE, context_cell_space_used_); 68 deserializer.set_reservation(PROPERTY_CELL_SPACE, 69 context_property_cell_space_used_); 70 deserializer.DeserializePartial(isolate, &root); 71 CHECK(root->IsContext()); 72 return Handle<Context>(Context::cast(root)); 73 } 74 75 76 #ifdef V8_USE_EXTERNAL_STARTUP_DATA 77 // Dummy implementations of Set*FromFile(..) APIs. 78 // 79 // These are meant for use with snapshot-external.cc. Should this file 80 // be compiled with those options we just supply these dummy implementations 81 // below. This happens when compiling the mksnapshot utility. 82 void SetNativesFromFile(StartupData* data) { CHECK(false); } 83 void SetSnapshotFromFile(StartupData* data) { CHECK(false); } 84 #endif // V8_USE_EXTERNAL_STARTUP_DATA 85 86 } } // namespace v8::internal 87