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/*
* Copyright (C) 2010 University of Szeged
* Copyright (C) 2010 Renata Hodovan (hodovan@inf.u-szeged.hu)
* All rights reserved.
* Copyright (C) 2019 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 UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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 "RegExp.h"
#include "RegExpKey.h"
#include "Strong.h"
#include "Weak.h"
#include <array>
#include <wtf/HashMap.h>
namespace JSC {
namespace Yarr {
enum class Flags : uint8_t;
}
class RegExpCache : private WeakHandleOwner {
WTF_MAKE_FAST_ALLOCATED;
friend class RegExp;
typedef HashMap<RegExpKey, Weak<RegExp>> RegExpCacheMap;
public:
RegExpCache(VM* vm);
void deleteAllCode();
RegExp* ensureEmptyRegExp(VM& vm)
{
if (LIKELY(m_emptyRegExp))
return m_emptyRegExp.get();
return ensureEmptyRegExpSlow(vm);
}
private:
static constexpr unsigned maxStrongCacheablePatternLength = 256;
static constexpr int maxStrongCacheableEntries = 32;
void finalize(Handle<Unknown>, void* context) override;
RegExp* ensureEmptyRegExpSlow(VM&);
RegExp* lookupOrCreate(const WTF::String& patternString, OptionSet<Yarr::Flags>);
void addToStrongCache(RegExp*);
RegExpCacheMap m_weakCache; // Holds all regular expressions currently live.
int m_nextEntryInStrongCache;
std::array<Strong<RegExp>, maxStrongCacheableEntries> m_strongCache; // Holds a select few regular expressions that have compiled and executed
Strong<RegExp> m_emptyRegExp;
VM* m_vm;
};
} // namespace JSC