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/*
* Copyright (C) 2008-2021 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.
*/
#include "config.h"
#include "SmallStrings.h"
#include "JSCJSValueInlines.h"
#include <wtf/text/StringImpl.h>
namespace JSC {
SmallStrings::SmallStrings()
{
static_assert(singleCharacterStringCount == sizeof(m_singleCharacterStrings) / sizeof(m_singleCharacterStrings[0]), "characters count is in sync with class usage");
for (unsigned i = 0; i < singleCharacterStringCount; ++i)
m_singleCharacterStrings[i] = nullptr;
}
void SmallStrings::initializeCommonStrings(VM& vm)
{
ASSERT(!m_emptyString);
m_emptyString = JSString::createEmptyString(vm);
ASSERT(m_needsToBeVisited);
for (unsigned i = 0; i < singleCharacterStringCount; ++i) {
ASSERT(!m_singleCharacterStrings[i]);
const LChar string[] = { static_cast<LChar>(i) };
m_singleCharacterStrings[i] = JSString::createHasOtherOwner(vm, AtomStringImpl::add(string, 1).releaseNonNull());
ASSERT(m_needsToBeVisited);
}
#define JSC_COMMON_STRINGS_ATTRIBUTE_INITIALIZE(name) initialize(&vm, m_##name, #name ## _s);
JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_INITIALIZE)
#undef JSC_COMMON_STRINGS_ATTRIBUTE_INITIALIZE
initialize(&vm, m_objectStringStart, "[object "_s);
initialize(&vm, m_nullObjectString, "[object Null]"_s);
initialize(&vm, m_undefinedObjectString, "[object Undefined]"_s);
initialize(&vm, m_boundPrefixString, "bound "_s);
initialize(&vm, m_notEqualString, "not-equal"_s);
initialize(&vm, m_timedOutString, "timed-out"_s);
initialize(&vm, m_okString, "ok"_s);
initialize(&vm, m_sentinelString, "$"_s);
setIsInitialized(true);
}
template<typename Visitor>
void SmallStrings::visitStrongReferences(Visitor& visitor)
{
m_needsToBeVisited = false;
visitor.appendUnbarriered(m_emptyString);
for (unsigned i = 0; i <= maxSingleCharacterString; ++i)
visitor.appendUnbarriered(m_singleCharacterStrings[i]);
#define JSC_COMMON_STRINGS_ATTRIBUTE_VISIT(name) visitor.appendUnbarriered(m_##name);
JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_VISIT)
#undef JSC_COMMON_STRINGS_ATTRIBUTE_VISIT
visitor.appendUnbarriered(m_objectStringStart);
visitor.appendUnbarriered(m_nullObjectString);
visitor.appendUnbarriered(m_undefinedObjectString);
visitor.appendUnbarriered(m_boundPrefixString);
visitor.appendUnbarriered(m_notEqualString);
visitor.appendUnbarriered(m_timedOutString);
visitor.appendUnbarriered(m_okString);
visitor.appendUnbarriered(m_sentinelString);
}
template void SmallStrings::visitStrongReferences(AbstractSlotVisitor&);
template void SmallStrings::visitStrongReferences(SlotVisitor&);
SmallStrings::~SmallStrings()
{
}
Ref<AtomStringImpl> SmallStrings::singleCharacterStringRep(unsigned char character)
{
if (LIKELY(m_isInitialized))
return *static_cast<AtomStringImpl*>(const_cast<StringImpl*>(m_singleCharacterStrings[character]->tryGetValueImpl()));
const LChar string[] = { static_cast<LChar>(character) };
return AtomStringImpl::add(string, 1).releaseNonNull();
}
void SmallStrings::initialize(VM* vm, JSString*& string, ASCIILiteral value)
{
string = JSString::create(*vm, AtomStringImpl::add(value));
ASSERT(m_needsToBeVisited);
}
} // namespace JSC
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