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// 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/base/logging.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;
}
}
DCHECK(false);
return -1;
}
int GetRawScriptsSize() {
DCHECK(false); // Used for compression. Doesn't really make sense here.
return 0;
}
Vector<const byte> GetScriptsSource() {
DCHECK(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() {
DCHECK(holder_);
return holder_;
}
static void set(NativesStore* store) {
DCHECK(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) {
DCHECK(natives_blob);
DCHECK(natives_blob->data);
DCHECK(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));
DCHECK(!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();
}
template<NativeType type>
void NativesCollection<type>::SetRawScriptsSource(
Vector<const char> raw_source) {
CHECK(false); // Use SetNativesFromFile for this implementation.
}
// 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
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