1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // The common functionality when building with or without snapshots. 29 30 #include "v8.h" 31 32 #include "api.h" 33 #include "serialize.h" 34 #include "snapshot.h" 35 #include "platform.h" 36 37 namespace v8 { 38 namespace internal { 39 40 41 static void ReserveSpaceForSnapshot(Deserializer* deserializer, 42 const char* file_name) { 43 int file_name_length = StrLength(file_name) + 10; 44 Vector<char> name = Vector<char>::New(file_name_length + 1); 45 OS::SNPrintF(name, "%s.size", file_name); 46 FILE* fp = OS::FOpen(name.start(), "r"); 47 CHECK_NE(NULL, fp); 48 int new_size, pointer_size, data_size, code_size, map_size, cell_size, 49 property_cell_size; 50 #ifdef _MSC_VER 51 // Avoid warning about unsafe fscanf from MSVC. 52 // Please note that this is only fine if %c and %s are not being used. 53 #define fscanf fscanf_s 54 #endif 55 CHECK_EQ(1, fscanf(fp, "new %d\n", &new_size)); 56 CHECK_EQ(1, fscanf(fp, "pointer %d\n", &pointer_size)); 57 CHECK_EQ(1, fscanf(fp, "data %d\n", &data_size)); 58 CHECK_EQ(1, fscanf(fp, "code %d\n", &code_size)); 59 CHECK_EQ(1, fscanf(fp, "map %d\n", &map_size)); 60 CHECK_EQ(1, fscanf(fp, "cell %d\n", &cell_size)); 61 CHECK_EQ(1, fscanf(fp, "property cell %d\n", &property_cell_size)); 62 #ifdef _MSC_VER 63 #undef fscanf 64 #endif 65 fclose(fp); 66 deserializer->set_reservation(NEW_SPACE, new_size); 67 deserializer->set_reservation(OLD_POINTER_SPACE, pointer_size); 68 deserializer->set_reservation(OLD_DATA_SPACE, data_size); 69 deserializer->set_reservation(CODE_SPACE, code_size); 70 deserializer->set_reservation(MAP_SPACE, map_size); 71 deserializer->set_reservation(CELL_SPACE, cell_size); 72 deserializer->set_reservation(PROPERTY_CELL_SPACE, 73 property_cell_size); 74 name.Dispose(); 75 } 76 77 78 void Snapshot::ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer) { 79 deserializer->set_reservation(NEW_SPACE, new_space_used_); 80 deserializer->set_reservation(OLD_POINTER_SPACE, pointer_space_used_); 81 deserializer->set_reservation(OLD_DATA_SPACE, data_space_used_); 82 deserializer->set_reservation(CODE_SPACE, code_space_used_); 83 deserializer->set_reservation(MAP_SPACE, map_space_used_); 84 deserializer->set_reservation(CELL_SPACE, cell_space_used_); 85 deserializer->set_reservation(PROPERTY_CELL_SPACE, 86 property_cell_space_used_); 87 } 88 89 90 bool Snapshot::Initialize(const char* snapshot_file) { 91 if (snapshot_file) { 92 int len; 93 byte* str = ReadBytes(snapshot_file, &len); 94 if (!str) return false; 95 bool success; 96 { 97 SnapshotByteSource source(str, len); 98 Deserializer deserializer(&source); 99 ReserveSpaceForSnapshot(&deserializer, snapshot_file); 100 success = V8::Initialize(&deserializer); 101 } 102 DeleteArray(str); 103 return success; 104 } else if (size_ > 0) { 105 ElapsedTimer timer; 106 if (FLAG_profile_deserialization) { 107 timer.Start(); 108 } 109 SnapshotByteSource source(raw_data_, raw_size_); 110 Deserializer deserializer(&source); 111 ReserveSpaceForLinkedInSnapshot(&deserializer); 112 bool success = V8::Initialize(&deserializer); 113 if (FLAG_profile_deserialization) { 114 double ms = timer.Elapsed().InMillisecondsF(); 115 PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms); 116 } 117 return success; 118 } 119 return false; 120 } 121 122 123 bool Snapshot::HaveASnapshotToStartFrom() { 124 return size_ != 0; 125 } 126 127 128 Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) { 129 if (context_size_ == 0) { 130 return Handle<Context>(); 131 } 132 SnapshotByteSource source(context_raw_data_, 133 context_raw_size_); 134 Deserializer deserializer(&source); 135 Object* root; 136 deserializer.set_reservation(NEW_SPACE, context_new_space_used_); 137 deserializer.set_reservation(OLD_POINTER_SPACE, context_pointer_space_used_); 138 deserializer.set_reservation(OLD_DATA_SPACE, context_data_space_used_); 139 deserializer.set_reservation(CODE_SPACE, context_code_space_used_); 140 deserializer.set_reservation(MAP_SPACE, context_map_space_used_); 141 deserializer.set_reservation(CELL_SPACE, context_cell_space_used_); 142 deserializer.set_reservation(PROPERTY_CELL_SPACE, 143 context_property_cell_space_used_); 144 deserializer.DeserializePartial(isolate, &root); 145 CHECK(root->IsContext()); 146 return Handle<Context>(Context::cast(root)); 147 } 148 149 } } // namespace v8::internal 150
