Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 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/snapshot/natives.h" |
| 6 | |
| 7 | #include "src/base/logging.h" |
| 8 | #include "src/list.h" |
| 9 | #include "src/list-inl.h" |
| 10 | #include "src/snapshot/snapshot-source-sink.h" |
| 11 | #include "src/vector.h" |
| 12 | |
| 13 | #ifndef V8_USE_EXTERNAL_STARTUP_DATA |
| 14 | #error natives-external.cc is used only for the external snapshot build. |
| 15 | #endif // V8_USE_EXTERNAL_STARTUP_DATA |
| 16 | |
| 17 | |
| 18 | namespace v8 { |
| 19 | namespace internal { |
| 20 | |
| 21 | |
| 22 | /** |
| 23 | * NativesStore stores the 'native' (builtin) JS libraries. |
| 24 | * |
| 25 | * NativesStore needs to be initialized before using V8, usually by the |
| 26 | * embedder calling v8::SetNativesDataBlob, which calls SetNativesFromFile |
| 27 | * below. |
| 28 | */ |
| 29 | class NativesStore { |
| 30 | public: |
| 31 | ~NativesStore() { |
| 32 | for (int i = 0; i < native_names_.length(); i++) { |
| 33 | native_names_[i].Dispose(); |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | int GetBuiltinsCount() { return native_ids_.length(); } |
| 38 | int GetDebuggerCount() { return debugger_count_; } |
| 39 | |
| 40 | Vector<const char> GetScriptSource(int index) { |
| 41 | return native_source_[index]; |
| 42 | } |
| 43 | |
| 44 | Vector<const char> GetScriptName(int index) { return native_names_[index]; } |
| 45 | |
| 46 | int GetIndex(const char* id) { |
| 47 | for (int i = 0; i < native_ids_.length(); ++i) { |
| 48 | int native_id_length = native_ids_[i].length(); |
| 49 | if ((static_cast<int>(strlen(id)) == native_id_length) && |
| 50 | (strncmp(id, native_ids_[i].start(), native_id_length) == 0)) { |
| 51 | return i; |
| 52 | } |
| 53 | } |
| 54 | DCHECK(false); |
| 55 | return -1; |
| 56 | } |
| 57 | |
| 58 | Vector<const char> GetScriptsSource() { |
| 59 | DCHECK(false); // Not implemented. |
| 60 | return Vector<const char>(); |
| 61 | } |
| 62 | |
| 63 | static NativesStore* MakeFromScriptsSource(SnapshotByteSource* source) { |
| 64 | NativesStore* store = new NativesStore; |
| 65 | |
| 66 | // We expect the libraries in the following format: |
| 67 | // int: # of debugger sources. |
| 68 | // 2N blobs: N pairs of source name + actual source. |
| 69 | // then, repeat for non-debugger sources. |
| 70 | int debugger_count = source->GetInt(); |
| 71 | for (int i = 0; i < debugger_count; ++i) |
| 72 | store->ReadNameAndContentPair(source); |
| 73 | int library_count = source->GetInt(); |
| 74 | for (int i = 0; i < library_count; ++i) |
| 75 | store->ReadNameAndContentPair(source); |
| 76 | |
| 77 | store->debugger_count_ = debugger_count; |
| 78 | return store; |
| 79 | } |
| 80 | |
| 81 | private: |
| 82 | NativesStore() : debugger_count_(0) {} |
| 83 | |
| 84 | Vector<const char> NameFromId(const byte* id, int id_length) { |
| 85 | const char native[] = "native "; |
| 86 | const char extension[] = ".js"; |
| 87 | Vector<char> name(Vector<char>::New(id_length + sizeof(native) - 1 + |
| 88 | sizeof(extension) - 1)); |
| 89 | memcpy(name.start(), native, sizeof(native) - 1); |
| 90 | memcpy(name.start() + sizeof(native) - 1, id, id_length); |
| 91 | memcpy(name.start() + sizeof(native) - 1 + id_length, extension, |
| 92 | sizeof(extension) - 1); |
| 93 | return Vector<const char>::cast(name); |
| 94 | } |
| 95 | |
| 96 | void ReadNameAndContentPair(SnapshotByteSource* bytes) { |
| 97 | const byte* id; |
| 98 | const byte* source; |
| 99 | int id_length = bytes->GetBlob(&id); |
| 100 | int source_length = bytes->GetBlob(&source); |
| 101 | Vector<const char> id_vector(reinterpret_cast<const char*>(id), id_length); |
| 102 | Vector<const char> source_vector(reinterpret_cast<const char*>(source), |
| 103 | source_length); |
| 104 | native_ids_.Add(id_vector); |
| 105 | native_source_.Add(source_vector); |
| 106 | native_names_.Add(NameFromId(id, id_length)); |
| 107 | } |
| 108 | |
| 109 | List<Vector<const char> > native_ids_; |
| 110 | List<Vector<const char> > native_names_; |
| 111 | List<Vector<const char> > native_source_; |
| 112 | int debugger_count_; |
| 113 | |
| 114 | DISALLOW_COPY_AND_ASSIGN(NativesStore); |
| 115 | }; |
| 116 | |
| 117 | |
| 118 | template<NativeType type> |
| 119 | class NativesHolder { |
| 120 | public: |
| 121 | static NativesStore* get() { |
| 122 | CHECK(holder_); |
| 123 | return holder_; |
| 124 | } |
| 125 | static void set(NativesStore* store) { |
| 126 | CHECK(store); |
| 127 | holder_ = store; |
| 128 | } |
| 129 | static bool empty() { return holder_ == NULL; } |
| 130 | static void Dispose() { |
| 131 | delete holder_; |
| 132 | holder_ = NULL; |
| 133 | } |
| 134 | |
| 135 | private: |
| 136 | static NativesStore* holder_; |
| 137 | }; |
| 138 | |
| 139 | template<NativeType type> |
| 140 | NativesStore* NativesHolder<type>::holder_ = NULL; |
| 141 | |
| 142 | |
| 143 | // The natives blob. Memory is owned by caller. |
| 144 | static StartupData* natives_blob_ = NULL; |
| 145 | |
| 146 | |
| 147 | /** |
| 148 | * Read the Natives blob, as previously set by SetNativesFromFile. |
| 149 | */ |
| 150 | void ReadNatives() { |
| 151 | if (natives_blob_ && NativesHolder<CORE>::empty()) { |
| 152 | SnapshotByteSource bytes(natives_blob_->data, natives_blob_->raw_size); |
| 153 | NativesHolder<CORE>::set(NativesStore::MakeFromScriptsSource(&bytes)); |
| 154 | NativesHolder<EXPERIMENTAL>::set( |
| 155 | NativesStore::MakeFromScriptsSource(&bytes)); |
| 156 | NativesHolder<EXTRAS>::set(NativesStore::MakeFromScriptsSource(&bytes)); |
| 157 | NativesHolder<EXPERIMENTAL_EXTRAS>::set( |
| 158 | NativesStore::MakeFromScriptsSource(&bytes)); |
| 159 | DCHECK(!bytes.HasMore()); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | |
| 164 | /** |
| 165 | * Set the Natives (library sources) blob, as generated by js2c + the build |
| 166 | * system. |
| 167 | */ |
| 168 | void SetNativesFromFile(StartupData* natives_blob) { |
| 169 | DCHECK(!natives_blob_); |
| 170 | DCHECK(natives_blob); |
| 171 | DCHECK(natives_blob->data); |
| 172 | DCHECK(natives_blob->raw_size > 0); |
| 173 | |
| 174 | natives_blob_ = natives_blob; |
| 175 | ReadNatives(); |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /** |
| 180 | * Release memory allocated by SetNativesFromFile. |
| 181 | */ |
| 182 | void DisposeNatives() { |
| 183 | NativesHolder<CORE>::Dispose(); |
| 184 | NativesHolder<EXPERIMENTAL>::Dispose(); |
| 185 | NativesHolder<EXTRAS>::Dispose(); |
| 186 | NativesHolder<EXPERIMENTAL_EXTRAS>::Dispose(); |
| 187 | } |
| 188 | |
| 189 | |
| 190 | // Implement NativesCollection<T> bsaed on NativesHolder + NativesStore. |
| 191 | // |
| 192 | // (The callers expect a purely static interface, since this is how the |
| 193 | // natives are usually compiled in. Since we implement them based on |
| 194 | // runtime content, we have to implement this indirection to offer |
| 195 | // a static interface.) |
| 196 | template<NativeType type> |
| 197 | int NativesCollection<type>::GetBuiltinsCount() { |
| 198 | return NativesHolder<type>::get()->GetBuiltinsCount(); |
| 199 | } |
| 200 | |
| 201 | template<NativeType type> |
| 202 | int NativesCollection<type>::GetDebuggerCount() { |
| 203 | return NativesHolder<type>::get()->GetDebuggerCount(); |
| 204 | } |
| 205 | |
| 206 | template<NativeType type> |
| 207 | int NativesCollection<type>::GetIndex(const char* name) { |
| 208 | return NativesHolder<type>::get()->GetIndex(name); |
| 209 | } |
| 210 | |
| 211 | template <NativeType type> |
| 212 | Vector<const char> NativesCollection<type>::GetScriptSource(int index) { |
| 213 | return NativesHolder<type>::get()->GetScriptSource(index); |
| 214 | } |
| 215 | |
| 216 | template<NativeType type> |
| 217 | Vector<const char> NativesCollection<type>::GetScriptName(int index) { |
| 218 | return NativesHolder<type>::get()->GetScriptName(index); |
| 219 | } |
| 220 | |
| 221 | template <NativeType type> |
| 222 | Vector<const char> NativesCollection<type>::GetScriptsSource() { |
| 223 | return NativesHolder<type>::get()->GetScriptsSource(); |
| 224 | } |
| 225 | |
| 226 | |
| 227 | // Explicit template instantiations. |
| 228 | #define INSTANTIATE_TEMPLATES(T) \ |
| 229 | template int NativesCollection<T>::GetBuiltinsCount(); \ |
| 230 | template int NativesCollection<T>::GetDebuggerCount(); \ |
| 231 | template int NativesCollection<T>::GetIndex(const char* name); \ |
| 232 | template Vector<const char> NativesCollection<T>::GetScriptSource(int i); \ |
| 233 | template Vector<const char> NativesCollection<T>::GetScriptName(int i); \ |
| 234 | template Vector<const char> NativesCollection<T>::GetScriptsSource(); |
| 235 | INSTANTIATE_TEMPLATES(CORE) |
| 236 | INSTANTIATE_TEMPLATES(EXPERIMENTAL) |
| 237 | INSTANTIATE_TEMPLATES(EXTRAS) |
| 238 | INSTANTIATE_TEMPLATES(EXPERIMENTAL_EXTRAS) |
| 239 | #undef INSTANTIATE_TEMPLATES |
| 240 | |
| 241 | } // namespace internal |
| 242 | } // namespace v8 |