Revert "Support external startup data in V8."

src/natives-external.cc

-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/natives.h"
-
-#include "src/checks.h"
-#include "src/list.h"
-#include "src/list-inl.h"
-#include "src/snapshot-source-sink.h"
-#include "src/vector.h"
-
-namespace v8 {
-namespace internal {
-
-
-/**
- * NativesStore stores the 'native' (builtin) JS libraries.
- *
- * NativesStore needs to be initialized before using V8, usually by the
- * embedder calling v8::SetNativesDataBlob, which calls SetNativesFromFile
- * below.
- */
-class NativesStore {
- public:
-  ~NativesStore() {}
-
-  int GetBuiltinsCount() { return native_names_.length(); }
-  int GetDebuggerCount() { return debugger_count_; }
-  Vector<const char> GetScriptName(int index) { return native_names_[index]; }
-  Vector<const char> GetRawScriptSource(int index) {
-    return native_source_[index];
-  }
-
-  int GetIndex(const char* name) {
-    for (int i = 0; i < native_names_.length(); ++i) {
-      if (strcmp(name, native_names_[i].start()) == 0) {
-        return i;
-      }
-    }
-    ASSERT(false);
-    return -1;
-  }
-
-  int GetRawScriptsSize() {
-    ASSERT(false);  // Used for compression. Doesn't really make sense here.
-    return 0;
-  }
-
-  Vector<const byte> GetScriptsSource() {
-    ASSERT(false);  // Used for compression. Doesn't really make sense here.
-    return Vector<const byte>();
-  }
-
-  static NativesStore* MakeFromScriptsSource(SnapshotByteSource* source) {
-    NativesStore* store = new NativesStore;
-
-    // We expect the libraries in the following format:
-    //   int: # of debugger sources.
-    //   2N blobs: N pairs of source name + actual source.
-    //   then, repeat for non-debugger sources.
-    int debugger_count = source->GetInt();
-    for (int i = 0; i < debugger_count; ++i)
-      store->ReadNameAndContentPair(source);
-    int library_count = source->GetInt();
-    for (int i = 0; i < library_count; ++i)
-      store->ReadNameAndContentPair(source);
-
-    store->debugger_count_ = debugger_count;
-    return store;
-  }
-
- private:
-  NativesStore() : debugger_count_(0) {}
-
-  bool ReadNameAndContentPair(SnapshotByteSource* bytes) {
-    const byte* name;
-    int name_length;
-    const byte* source;
-    int source_length;
-    bool success = bytes->GetBlob(&name, &name_length) &&
-                   bytes->GetBlob(&source, &source_length);
-    if (success) {
-      Vector<const char> name_vector(
-          reinterpret_cast<const char*>(name), name_length);
-      Vector<const char> source_vector(
-          reinterpret_cast<const char*>(source), source_length);
-      native_names_.Add(name_vector);
-      native_source_.Add(source_vector);
-    }
-    return success;
-  }
-
-  List<Vector<const char> > native_names_;
-  List<Vector<const char> > native_source_;
-  int debugger_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(NativesStore);
-};
-
-
-template<NativeType type>
-class NativesHolder {
- public:
-  static NativesStore* get() {
-    ASSERT(holder_);
-    return holder_;
-  }
-  static void set(NativesStore* store) {
-    ASSERT(store);
-    holder_ = store;
-  }
-
- private:
-  static NativesStore* holder_;
-};
-
-template<NativeType type>
-NativesStore* NativesHolder<type>::holder_ = NULL;
-
-
-/**
- * Read the Natives (library sources) blob, as generated by js2c + the build
- * system.
- */
-void SetNativesFromFile(StartupData* natives_blob) {
-  ASSERT(natives_blob);
-  ASSERT(natives_blob->data);
-  ASSERT(natives_blob->raw_size > 0);
-
-  SnapshotByteSource bytes(
-      reinterpret_cast<const byte*>(natives_blob->data),
-      natives_blob->raw_size);
-  NativesHolder<CORE>::set(NativesStore::MakeFromScriptsSource(&bytes));
-  NativesHolder<EXPERIMENTAL>::set(NativesStore::MakeFromScriptsSource(&bytes));
-  ASSERT(!bytes.HasMore());
-}
-
-
-// Implement NativesCollection<T> bsaed on NativesHolder + NativesStore.
-//
-// (The callers expect a purely static interface, since this is how the
-//  natives are usually compiled in. Since we implement them based on
-//  runtime content, we have to implement this indirection to offer
-//  a static interface.)
-template<NativeType type>
-int NativesCollection<type>::GetBuiltinsCount() {
-  return NativesHolder<type>::get()->GetBuiltinsCount();
-}
-
-template<NativeType type>
-int NativesCollection<type>::GetDebuggerCount() {
-  return NativesHolder<type>::get()->GetDebuggerCount();
-}
-
-template<NativeType type>
-int NativesCollection<type>::GetIndex(const char* name) {
-  return NativesHolder<type>::get()->GetIndex(name);
-}
-
-template<NativeType type>
-int NativesCollection<type>::GetRawScriptsSize() {
-  return NativesHolder<type>::get()->GetRawScriptsSize();
-}
-
-template<NativeType type>
-Vector<const char> NativesCollection<type>::GetRawScriptSource(int index) {
-  return NativesHolder<type>::get()->GetRawScriptSource(index);
-}
-
-template<NativeType type>
-Vector<const char> NativesCollection<type>::GetScriptName(int index) {
-  return NativesHolder<type>::get()->GetScriptName(index);
-}
-
-template<NativeType type>
-Vector<const byte> NativesCollection<type>::GetScriptsSource() {
-  return NativesHolder<type>::get()->GetScriptsSource();
-}
-
-
-// The compiler can't 'see' all uses of the static methods and hence
-// my chose to elide them. This we'll explicitly instantiate these.
-template class NativesCollection<CORE>;
-template class NativesCollection<EXPERIMENTAL>;
-template class NativesCollection<D8>;
-template class NativesCollection<TEST>;
-
-}  // namespace v8::internal
-}  // namespace v8