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/*
* Copyright (C) 2021-2024 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.
*/
#pragma once
#include "ScriptBuffer.h"
#include <JavaScriptCore/SourceProvider.h>
namespace WebCore {
class AbstractScriptBufferHolder {
public:
virtual void clearDecodedData() = 0;
virtual void tryReplaceScriptBuffer(const ScriptBuffer&) = 0;
virtual ~AbstractScriptBufferHolder() { }
};
class ScriptBufferSourceProvider final : public JSC::SourceProvider, public AbstractScriptBufferHolder, public CanMakeWeakPtr<ScriptBufferSourceProvider> {
WTF_MAKE_TZONE_ALLOCATED(ScriptBufferSourceProvider);
public:
static Ref<ScriptBufferSourceProvider> create(const ScriptBuffer& scriptBuffer, const JSC::SourceOrigin& sourceOrigin, String sourceURL, String preRedirectURL, const TextPosition& startPosition = TextPosition(), JSC::SourceProviderSourceType sourceType = JSC::SourceProviderSourceType::Program)
{
return adoptRef(*new ScriptBufferSourceProvider(scriptBuffer, sourceOrigin, WTFMove(sourceURL), WTFMove(preRedirectURL), startPosition, sourceType));
}
unsigned hash() const final
{
if (!m_scriptHash)
source();
return m_scriptHash;
}
StringView source() const final
{
return sourceImpl(Locker { m_lock });
}
void clearDecodedData() final
{
Locker locker { m_lock };
m_cachedScriptString = String();
}
void tryReplaceScriptBuffer(const ScriptBuffer& scriptBuffer) final
{
// If this new file-mapped script buffer is identical to the one we have, then replace
// ours to save dirty memory.
Locker locker { m_lock };
if (m_scriptBuffer != scriptBuffer)
return;
m_scriptBuffer = scriptBuffer;
m_contiguousBuffer = nullptr;
}
JSC::CodeBlockHash codeBlockHashConcurrently(int startOffset, int endOffset, JSC::CodeSpecializationKind kind) override
{
Locker locker { m_lock };
auto view = sourceImpl(locker);
return JSC::CodeBlockHash { view.substring(startOffset, endOffset - startOffset), view, kind };
}
private:
ScriptBufferSourceProvider(const ScriptBuffer& scriptBuffer, const JSC::SourceOrigin& sourceOrigin, String&& sourceURL, String&& preRedirectURL, const TextPosition& startPosition, JSC::SourceProviderSourceType sourceType)
: JSC::SourceProvider(sourceOrigin, WTFMove(sourceURL), WTFMove(preRedirectURL), JSC::SourceTaintedOrigin::Untainted, startPosition, sourceType)
, m_scriptBuffer(scriptBuffer)
{
}
bool isScriptBufferSourceProvider() const final { return true; }
StringView sourceImpl(const AbstractLocker&) const
{
if (m_scriptBuffer.isEmpty())
return emptyString();
if (!m_contiguousBuffer && (!m_containsOnlyASCII || *m_containsOnlyASCII))
m_contiguousBuffer = m_scriptBuffer.protectedBuffer()->makeContiguous();
if (!m_containsOnlyASCII) {
m_containsOnlyASCII = charactersAreAllASCII(m_contiguousBuffer->span());
if (*m_containsOnlyASCII)
m_scriptHash = StringHasher::computeHashAndMaskTop8Bits(m_contiguousBuffer->span());
}
if (*m_containsOnlyASCII)
return byteCast<Latin1Character>(m_contiguousBuffer->span());
if (!m_cachedScriptString) {
m_cachedScriptString = m_scriptBuffer.toString();
if (!m_scriptHash)
m_scriptHash = m_cachedScriptString.impl()->hash();
}
return m_cachedScriptString;
}
ScriptBuffer m_scriptBuffer;
mutable RefPtr<SharedBuffer> m_contiguousBuffer;
mutable unsigned m_scriptHash { 0 };
mutable String m_cachedScriptString;
mutable std::optional<bool> m_containsOnlyASCII;
mutable Lock m_lock;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ScriptBufferSourceProvider)
static bool isType(const JSC::SourceProvider& provider) { return provider.isScriptBufferSourceProvider(); }
SPECIALIZE_TYPE_TRAITS_END()
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