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Issue 781943002: Reland "Encode reservation meta data in the snapshot blob." (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: rebase Created 6 years ago
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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // The common functionality when building with or without snapshots. 5 // The common functionality when building with or without snapshots.
6 6
7 #include "src/v8.h" 7 #include "src/v8.h"
8 8
9 #include "src/api.h" 9 #include "src/api.h"
10 #include "src/base/platform/platform.h" 10 #include "src/base/platform/platform.h"
11 #include "src/serialize.h" 11 #include "src/serialize.h"
12 #include "src/snapshot.h" 12 #include "src/snapshot.h"
13 13
14 namespace v8 { 14 namespace v8 {
15 namespace internal { 15 namespace internal {
16 16
17 void Snapshot::ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer) {
18 deserializer->AddReservation(NEW_SPACE, new_space_used_);
19 deserializer->AddReservation(OLD_POINTER_SPACE, pointer_space_used_);
20 deserializer->AddReservation(OLD_DATA_SPACE, data_space_used_);
21 deserializer->AddReservation(CODE_SPACE, code_space_used_);
22 deserializer->AddReservation(MAP_SPACE, map_space_used_);
23 deserializer->AddReservation(CELL_SPACE, cell_space_used_);
24 deserializer->AddReservation(PROPERTY_CELL_SPACE, property_cell_space_used_);
25 deserializer->AddReservation(LO_SPACE, lo_space_used_);
26 }
27
28 17
29 bool Snapshot::Initialize(Isolate* isolate) { 18 bool Snapshot::Initialize(Isolate* isolate) {
30 if (size_ > 0) { 19 if (size_ > 0) {
31 base::ElapsedTimer timer; 20 base::ElapsedTimer timer;
32 if (FLAG_profile_deserialization) { 21 if (FLAG_profile_deserialization) timer.Start();
33 timer.Start(); 22
34 } 23 SnapshotData snapshot_data(data_, size_);
35 SnapshotByteSource source(raw_data_, raw_size_); 24 Deserializer deserializer(&snapshot_data);
36 Deserializer deserializer(&source);
37 ReserveSpaceForLinkedInSnapshot(&deserializer);
38 bool success = isolate->Init(&deserializer); 25 bool success = isolate->Init(&deserializer);
39 if (FLAG_profile_deserialization) { 26 if (FLAG_profile_deserialization) {
40 double ms = timer.Elapsed().InMillisecondsF(); 27 double ms = timer.Elapsed().InMillisecondsF();
41 PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms); 28 PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms);
42 } 29 }
43 return success; 30 return success;
44 } 31 }
45 return false; 32 return false;
46 } 33 }
47 34
48 35
49 bool Snapshot::HaveASnapshotToStartFrom() { 36 bool Snapshot::HaveASnapshotToStartFrom() {
50 return size_ != 0; 37 return size_ != 0;
51 } 38 }
52 39
53 40
54 Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) { 41 Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) {
55 if (context_size_ == 0) { 42 if (context_size_ == 0) return Handle<Context>();
56 return Handle<Context>(); 43
57 } 44 SnapshotData snapshot_data(context_data_, context_size_);
58 SnapshotByteSource source(context_raw_data_, 45 Deserializer deserializer(&snapshot_data);
59 context_raw_size_);
60 Deserializer deserializer(&source);
61 Object* root; 46 Object* root;
62 deserializer.AddReservation(NEW_SPACE, context_new_space_used_);
63 deserializer.AddReservation(OLD_POINTER_SPACE, context_pointer_space_used_);
64 deserializer.AddReservation(OLD_DATA_SPACE, context_data_space_used_);
65 deserializer.AddReservation(CODE_SPACE, context_code_space_used_);
66 deserializer.AddReservation(MAP_SPACE, context_map_space_used_);
67 deserializer.AddReservation(CELL_SPACE, context_cell_space_used_);
68 deserializer.AddReservation(PROPERTY_CELL_SPACE,
69 context_property_cell_space_used_);
70 deserializer.AddReservation(LO_SPACE, context_lo_space_used_);
71 deserializer.DeserializePartial(isolate, &root); 47 deserializer.DeserializePartial(isolate, &root);
72 CHECK(root->IsContext()); 48 CHECK(root->IsContext());
73 return Handle<Context>(Context::cast(root)); 49 return Handle<Context>(Context::cast(root));
74 } 50 }
75 51
76 52
77 #ifdef V8_USE_EXTERNAL_STARTUP_DATA 53 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
78 // Dummy implementations of Set*FromFile(..) APIs. 54 // Dummy implementations of Set*FromFile(..) APIs.
79 // 55 //
80 // These are meant for use with snapshot-external.cc. Should this file 56 // These are meant for use with snapshot-external.cc. Should this file
81 // be compiled with those options we just supply these dummy implementations 57 // be compiled with those options we just supply these dummy implementations
82 // below. This happens when compiling the mksnapshot utility. 58 // below. This happens when compiling the mksnapshot utility.
83 void SetNativesFromFile(StartupData* data) { CHECK(false); } 59 void SetNativesFromFile(StartupData* data) { CHECK(false); }
84 void SetSnapshotFromFile(StartupData* data) { CHECK(false); } 60 void SetSnapshotFromFile(StartupData* data) { CHECK(false); }
85 #endif // V8_USE_EXTERNAL_STARTUP_DATA 61 #endif // V8_USE_EXTERNAL_STARTUP_DATA
86 62
87 } } // namespace v8::internal 63 } } // namespace v8::internal
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