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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GIN_ARRAY_BUFFER_H_
#define GIN_ARRAY_BUFFER_H_
#include <stddef.h>
#include <stdint.h>
#include "base/compiler_specific.h"
#include "base/memory/shared_memory_mapper.h"
#include "gin/converter.h"
#include "gin/gin_export.h"
#include "partition_alloc/partition_alloc.h"
#include "v8/include/v8-array-buffer.h"
#include "v8/include/v8-forward.h"
namespace gin {
class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
public:
void* Allocate(size_t length) override;
void* AllocateUninitialized(size_t length) override;
void Free(void* data, size_t length) override;
GIN_EXPORT static ArrayBufferAllocator* SharedInstance();
private:
friend class V8Initializer;
template <partition_alloc::AllocFlags flags>
void* AllocateInternal(size_t length);
// Initialize the PartitionAlloc partition from which instances of this class
// allocate memory. This is called after initializing V8 since, when enabled,
// the V8 sandbox must be initialized first.
static void InitializePartition();
// The PartitionAlloc partition that instances of this class allocate memory
// chunks from. When the V8 sandbox is enabled, this partition must be placed
// inside of it. For that, PA's ConfigurablePool is created inside the V8
// sandbox during initialization of V8, and this partition is then placed
// inside the configurable pool during InitializePartition().
static partition_alloc::PartitionRoot* partition_;
};
class GIN_EXPORT ArrayBuffer {
public:
ArrayBuffer();
ArrayBuffer(v8::Isolate* isolate, v8::Local<v8::ArrayBuffer> buffer);
ArrayBuffer(const ArrayBuffer&) = delete;
~ArrayBuffer();
ArrayBuffer& operator=(const ArrayBuffer& other);
void* bytes() const {
return backing_store_ ? backing_store_->Data() : nullptr;
}
size_t num_bytes() const {
return backing_store_ ? backing_store_->ByteLength() : 0;
}
private:
std::shared_ptr<v8::BackingStore> backing_store_;
};
template<>
struct GIN_EXPORT Converter<ArrayBuffer> {
static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
ArrayBuffer* out);
};
class GIN_EXPORT ArrayBufferView {
public:
ArrayBufferView();
ArrayBufferView(v8::Isolate* isolate, v8::Local<v8::ArrayBufferView> view);
ArrayBufferView(const ArrayBufferView&) = delete;
~ArrayBufferView();
ArrayBufferView& operator=(const ArrayBufferView& other);
void* bytes() const {
return UNSAFE_TODO(static_cast<uint8_t*>(array_buffer_.bytes()) + offset_);
}
size_t num_bytes() const { return num_bytes_; }
private:
ArrayBuffer array_buffer_;
size_t offset_;
size_t num_bytes_;
};
template<>
struct GIN_EXPORT Converter<ArrayBufferView> {
static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
ArrayBufferView* out);
};
GIN_EXPORT base::SharedMemoryMapper* GetSharedMemoryMapperForArrayBuffers();
} // namespace gin
#endif // GIN_ARRAY_BUFFER_H_
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