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289 lines (237 loc) · 8.7 KB
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/*
* Copyright (C) 2009, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ArrayBuffer_h
#define ArrayBuffer_h
#include "GCIncomingRefCounted.h"
#include "Weak.h"
#include <wtf/PassRefPtr.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
namespace JSC {
class ArrayBuffer;
class ArrayBufferView;
class JSArrayBuffer;
class ArrayBufferContents {
WTF_MAKE_NONCOPYABLE(ArrayBufferContents);
public:
ArrayBufferContents()
: m_data(0)
, m_sizeInBytes(0)
{ }
inline ~ArrayBufferContents();
void* data() { return m_data; }
unsigned sizeInBytes() { return m_sizeInBytes; }
private:
ArrayBufferContents(void* data, unsigned sizeInBytes)
: m_data(data)
, m_sizeInBytes(sizeInBytes)
{ }
friend class ArrayBuffer;
enum InitializationPolicy {
ZeroInitialize,
DontInitialize
};
static inline void tryAllocate(unsigned numElements, unsigned elementByteSize, InitializationPolicy, ArrayBufferContents&);
void transfer(ArrayBufferContents& other)
{
ASSERT(!other.m_data);
other.m_data = m_data;
other.m_sizeInBytes = m_sizeInBytes;
m_data = 0;
m_sizeInBytes = 0;
}
void copyTo(ArrayBufferContents& other)
{
ASSERT(!other.m_data);
ArrayBufferContents::tryAllocate(m_sizeInBytes, sizeof(char), ArrayBufferContents::DontInitialize, other);
if (!other.m_data)
return;
memcpy(other.m_data, m_data, m_sizeInBytes);
other.m_sizeInBytes = m_sizeInBytes;
}
void* m_data;
unsigned m_sizeInBytes;
};
class ArrayBuffer : public GCIncomingRefCounted<ArrayBuffer> {
public:
static inline PassRefPtr<ArrayBuffer> create(unsigned numElements, unsigned elementByteSize);
static inline PassRefPtr<ArrayBuffer> create(ArrayBuffer*);
static inline PassRefPtr<ArrayBuffer> create(const void* source, unsigned byteLength);
static inline PassRefPtr<ArrayBuffer> create(ArrayBufferContents&);
static inline PassRefPtr<ArrayBuffer> createAdopted(const void* data, unsigned byteLength);
// Only for use by Uint8ClampedArray::createUninitialized and SharedBuffer::createArrayBuffer.
static inline PassRefPtr<ArrayBuffer> createUninitialized(unsigned numElements, unsigned elementByteSize);
inline void* data();
inline const void* data() const;
inline unsigned byteLength() const;
inline size_t gcSizeEstimateInBytes() const;
inline PassRefPtr<ArrayBuffer> slice(int begin, int end) const;
inline PassRefPtr<ArrayBuffer> slice(int begin) const;
inline void pin();
inline void unpin();
JS_EXPORT_PRIVATE bool transfer(ArrayBufferContents&);
bool isNeutered() { return !m_contents.m_data; }
static ptrdiff_t offsetOfData() { return OBJECT_OFFSETOF(ArrayBuffer, m_contents) + OBJECT_OFFSETOF(ArrayBufferContents, m_data); }
~ArrayBuffer() { }
private:
static inline PassRefPtr<ArrayBuffer> create(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy);
inline ArrayBuffer(ArrayBufferContents&);
inline PassRefPtr<ArrayBuffer> sliceImpl(unsigned begin, unsigned end) const;
inline unsigned clampIndex(int index) const;
static inline int clampValue(int x, int left, int right);
unsigned m_pinCount;
ArrayBufferContents m_contents;
public:
Weak<JSArrayBuffer> m_wrapper;
};
int ArrayBuffer::clampValue(int x, int left, int right)
{
ASSERT(left <= right);
if (x < left)
x = left;
if (right < x)
x = right;
return x;
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize)
{
return create(numElements, elementByteSize, ArrayBufferContents::ZeroInitialize);
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBuffer* other)
{
return ArrayBuffer::create(other->data(), other->byteLength());
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(const void* source, unsigned byteLength)
{
ArrayBufferContents contents;
ArrayBufferContents::tryAllocate(byteLength, 1, ArrayBufferContents::ZeroInitialize, contents);
if (!contents.m_data)
return 0;
RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(contents));
ASSERT(!byteLength || source);
memcpy(buffer->data(), source, byteLength);
return buffer.release();
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBufferContents& contents)
{
return adoptRef(new ArrayBuffer(contents));
}
PassRefPtr<ArrayBuffer> ArrayBuffer::createAdopted(const void* data, unsigned byteLength)
{
ArrayBufferContents contents(const_cast<void*>(data), byteLength);
return create(contents);
}
PassRefPtr<ArrayBuffer> ArrayBuffer::createUninitialized(unsigned numElements, unsigned elementByteSize)
{
return create(numElements, elementByteSize, ArrayBufferContents::DontInitialize);
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy policy)
{
ArrayBufferContents contents;
ArrayBufferContents::tryAllocate(numElements, elementByteSize, policy, contents);
if (!contents.m_data)
return 0;
return adoptRef(new ArrayBuffer(contents));
}
ArrayBuffer::ArrayBuffer(ArrayBufferContents& contents)
: m_pinCount(0)
{
contents.transfer(m_contents);
}
void* ArrayBuffer::data()
{
return m_contents.m_data;
}
const void* ArrayBuffer::data() const
{
return m_contents.m_data;
}
unsigned ArrayBuffer::byteLength() const
{
return m_contents.m_sizeInBytes;
}
size_t ArrayBuffer::gcSizeEstimateInBytes() const
{
return sizeof(ArrayBuffer) + static_cast<size_t>(byteLength());
}
PassRefPtr<ArrayBuffer> ArrayBuffer::slice(int begin, int end) const
{
return sliceImpl(clampIndex(begin), clampIndex(end));
}
PassRefPtr<ArrayBuffer> ArrayBuffer::slice(int begin) const
{
return sliceImpl(clampIndex(begin), byteLength());
}
PassRefPtr<ArrayBuffer> ArrayBuffer::sliceImpl(unsigned begin, unsigned end) const
{
unsigned size = begin <= end ? end - begin : 0;
return ArrayBuffer::create(static_cast<const char*>(data()) + begin, size);
}
unsigned ArrayBuffer::clampIndex(int index) const
{
unsigned currentLength = byteLength();
if (index < 0)
index = currentLength + index;
return clampValue(index, 0, currentLength);
}
void ArrayBuffer::pin()
{
m_pinCount++;
}
void ArrayBuffer::unpin()
{
m_pinCount--;
}
void ArrayBufferContents::tryAllocate(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy policy, ArrayBufferContents& result)
{
// Do not allow 31-bit overflow of the total size.
if (numElements) {
unsigned totalSize = numElements * elementByteSize;
if (totalSize / numElements != elementByteSize
|| totalSize > static_cast<unsigned>(std::numeric_limits<int32_t>::max())) {
result.m_data = 0;
return;
}
}
bool allocationSucceeded = false;
if (policy == ZeroInitialize)
allocationSucceeded = WTF::tryFastCalloc(numElements, elementByteSize).getValue(result.m_data);
else {
ASSERT(policy == DontInitialize);
allocationSucceeded = WTF::tryFastMalloc(numElements * elementByteSize).getValue(result.m_data);
}
if (allocationSucceeded) {
result.m_sizeInBytes = numElements * elementByteSize;
return;
}
result.m_data = 0;
}
ArrayBufferContents::~ArrayBufferContents()
{
WTF::fastFree(m_data);
}
} // namespace JSC
using JSC::ArrayBuffer;
#endif // ArrayBuffer_h