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// Copyright 2011 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.
#ifndef V8_SNAPSHOT_NATIVES_H_
#define V8_SNAPSHOT_NATIVES_H_
#include "include/v8.h"
#include "src/utils/vector.h"
#include "src/objects/objects.h"
namespace v8 { class StartupData; } // Forward declaration.
namespace v8 {
namespace internal {
enum NativeType {
EXTRAS,
TEST
};
// Extra handling for V8_EXPORT_PRIVATE in combination with USING_V8_SHARED
// since definition of methods of classes marked as dllimport is not allowed.
template <NativeType type>
#ifdef USING_V8_SHARED
class NativesCollection {
#else
class V8_EXPORT_PRIVATE NativesCollection {
#endif // USING_V8_SHARED
public:
// The following methods are implemented in js2c-generated code:
// Number of built-in scripts.
static int GetBuiltinsCount();
static int GetIndex(const char* name);
static Vector<const char> GetScriptSource(int index);
static Vector<const char> GetScriptName(int index);
static Vector<const char> GetScriptsSource();
};
using ExtraNatives = NativesCollection<EXTRAS>;
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
// Used for reading the natives at runtime. Implementation in natives-empty.cc
void SetNativesFromFile(StartupData* natives_blob);
void ReadNatives();
void DisposeNatives();
#endif
class NativesExternalStringResource final
: public v8::String::ExternalOneByteStringResource {
public:
NativesExternalStringResource(NativeType type, int index);
const char* data() const override { return data_; }
size_t length() const override { return length_; }
v8::String::ExternalOneByteStringResource* EncodeForSerialization() const {
DCHECK(type_ == EXTRAS);
intptr_t val = (index_ << 1) | 1;
val = val << kSystemPointerSizeLog2; // Pointer align.
return reinterpret_cast<v8::String::ExternalOneByteStringResource*>(val);
}
// Decode from serialization.
static NativesExternalStringResource* DecodeForDeserialization(
const v8::String::ExternalOneByteStringResource* encoded) {
intptr_t val =
reinterpret_cast<intptr_t>(encoded) >> kSystemPointerSizeLog2;
DCHECK(val & 1);
int index = static_cast<int>(val >> 1);
return new NativesExternalStringResource(EXTRAS, index);
}
private:
const char* data_;
size_t length_;
NativeType type_;
int index_;
};
} // namespace internal
} // namespace v8
#endif // V8_SNAPSHOT_NATIVES_H_
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