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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.
*/
#pragma once
#include "CollectionScope.h"
#include "TypeofType.h"
#include <wtf/Noncopyable.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#define JSC_COMMON_STRINGS_EACH_NAME(macro) \
macro(default) \
macro(boolean) \
macro(false) \
macro(function) \
macro(number) \
macro(null) \
macro(object) \
macro(undefined) \
macro(string) \
macro(symbol) \
macro(bigint) \
macro(true)
namespace WTF {
class StringImpl;
}
namespace JSC {
class VM;
class JSString;
static constexpr unsigned maxSingleCharacterString = 0xFF;
class SmallStrings {
WTF_MAKE_NONCOPYABLE(SmallStrings);
public:
SmallStrings();
~SmallStrings();
JSString* emptyString()
{
return m_emptyString;
}
JSString* singleCharacterString(unsigned char character)
{
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
return m_singleCharacterStrings[character];
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
}
JS_EXPORT_PRIVATE Ref<AtomStringImpl> singleCharacterStringRep(unsigned char character);
void setIsInitialized(bool isInitialized) { m_isInitialized = isInitialized; }
JSString** singleCharacterStrings() { return &m_singleCharacterStrings[0]; }
void initializeCommonStrings(VM&);
template<typename Visitor> void visitStrongReferences(Visitor&);
#define JSC_COMMON_STRINGS_ACCESSOR_DEFINITION(name) \
JSString* name##String() const \
{ \
return m_##name; \
}
JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ACCESSOR_DEFINITION)
#undef JSC_COMMON_STRINGS_ACCESSOR_DEFINITION
JSString* typeString(TypeofType type) const
{
switch (type) {
case TypeofType::Undefined:
return undefinedString();
case TypeofType::Boolean:
return booleanString();
case TypeofType::Number:
return numberString();
case TypeofType::String:
return stringString();
case TypeofType::Symbol:
return symbolString();
case TypeofType::Object:
return objectString();
case TypeofType::Function:
return functionString();
case TypeofType::BigInt:
return bigintString();
}
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
JSString* objectStringStart() const { return m_objectStringStart; }
JSString* objectNullString() const { return m_objectNullString; }
JSString* objectUndefinedString() const { return m_objectUndefinedString; }
JSString* objectObjectString() const { return m_objectObjectString; }
JSString* objectArrayString() const { return m_objectArrayString; }
JSString* objectFunctionString() const { return m_objectFunctionString; }
JSString* objectArgumentsString() const { return m_objectArgumentsString; }
JSString* objectDateString() const { return m_objectDateString; }
JSString* objectRegExpString() const { return m_objectRegExpString; }
JSString* objectErrorString() const { return m_objectErrorString; }
JSString* objectBooleanString() const { return m_objectBooleanString; }
JSString* objectNumberString() const { return m_objectNumberString; }
JSString* objectStringString() const { return m_objectStringString; }
JSString* boundPrefixString() const { return m_boundPrefixString; }
JSString* notEqualString() const { return m_notEqualString; }
JSString* timedOutString() const { return m_timedOutString; }
JSString* okString() const { return m_okString; }
JSString* sentinelString() const { return m_sentinelString; }
bool needsToBeVisited(CollectionScope scope) const
{
if (scope == CollectionScope::Full)
return true;
return m_needsToBeVisited;
}
private:
static constexpr unsigned singleCharacterStringCount = maxSingleCharacterString + 1;
void initialize(VM*, JSString*&, ASCIILiteral value);
JSString* m_emptyString { nullptr };
#define JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION(name) JSString* m_##name { nullptr };
JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION)
#undef JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION
JSString* m_objectStringStart { nullptr };
JSString* m_objectNullString { nullptr };
JSString* m_objectUndefinedString { nullptr };
JSString* m_objectObjectString { nullptr };
JSString* m_objectArrayString { nullptr };
JSString* m_objectFunctionString { nullptr };
JSString* m_objectArgumentsString { nullptr };
JSString* m_objectDateString { nullptr };
JSString* m_objectRegExpString { nullptr };
JSString* m_objectErrorString { nullptr };
JSString* m_objectBooleanString { nullptr };
JSString* m_objectNumberString { nullptr };
JSString* m_objectStringString { nullptr };
JSString* m_boundPrefixString { nullptr };
JSString* m_notEqualString { nullptr };
JSString* m_timedOutString { nullptr };
JSString* m_okString { nullptr };
JSString* m_sentinelString { nullptr };
JSString* m_singleCharacterStrings[singleCharacterStringCount] { nullptr };
bool m_needsToBeVisited { true };
bool m_isInitialized { false };
};
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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