src/v8/src/snapshot-common.cc

   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() {
  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 = V8::Initialize(&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