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/*
* Copyright (C) 2012-2019 Apple Inc. All Rights Reserved.
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
*
* 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 "ParserModes.h"
#include "UnlinkedSourceCode.h"
#include <wtf/HashTraits.h>
namespace JSC {
enum class SourceCodeType { EvalType, ProgramType, FunctionType, ModuleType };
class SourceCodeFlags {
friend class CachedSourceCodeKey;
public:
SourceCodeFlags() = default;
SourceCodeFlags(
SourceCodeType codeType, LexicallyScopedFeatures lexicallyScopedFeatures, JSParserScriptMode scriptMode,
DerivedContextType derivedContextType, EvalContextType evalContextType, bool isArrowFunctionContext,
OptionSet<CodeGenerationMode> codeGenerationMode)
: m_flags(
(static_cast<unsigned>(codeGenerationMode.toRaw()) << 6) |
(static_cast<unsigned>(scriptMode) << 5) |
(static_cast<unsigned>(isArrowFunctionContext) << 4) |
(static_cast<unsigned>(evalContextType) << 3) |
(static_cast<unsigned>(derivedContextType) << 2) |
(static_cast<unsigned>(codeType) << 1) |
(static_cast<unsigned>(lexicallyScopedFeatures & StrictModeLexicallyScopedFeature))
)
{
}
friend bool operator==(const SourceCodeFlags&, const SourceCodeFlags&) = default;
unsigned bits() { return m_flags; }
private:
unsigned m_flags { 0 };
};
class SourceCodeKey {
WTF_MAKE_FAST_ALLOCATED(SourceCodeKey);
friend class CachedSourceCodeKey;
public:
SourceCodeKey()
{
}
SourceCodeKey(
const UnlinkedSourceCode& sourceCode, const String& name, SourceCodeType codeType, LexicallyScopedFeatures lexicallyScopedFeatures,
JSParserScriptMode scriptMode, DerivedContextType derivedContextType, EvalContextType evalContextType, bool isArrowFunctionContext,
OptionSet<CodeGenerationMode> codeGenerationMode, std::optional<int> functionConstructorParametersEndPosition)
: m_sourceCode(sourceCode)
, m_name(name)
, m_flags(codeType, lexicallyScopedFeatures, scriptMode, derivedContextType, evalContextType, isArrowFunctionContext, codeGenerationMode)
, m_functionConstructorParametersEndPosition(functionConstructorParametersEndPosition.value_or(-1))
, m_hash(sourceCode.hash() ^ m_flags.bits())
{
}
SourceCodeKey(WTF::HashTableDeletedValueType)
: m_sourceCode(WTF::HashTableDeletedValue)
{
}
bool isHashTableDeletedValue() const { return m_sourceCode.isHashTableDeletedValue(); }
unsigned hash() const { return m_hash; }
const UnlinkedSourceCode& source() const { return m_sourceCode; }
size_t length() const { return m_sourceCode.length(); }
bool isNull() const { return m_sourceCode.isNull(); }
// To save memory, we compute our string on demand. It's expected that source
// providers cache their strings to make this efficient.
StringView string() const { return m_sourceCode.view(); }
StringView host() const { return m_sourceCode.provider().sourceOrigin().url().host(); }
int functionConstructorParametersEndPosition() const { return m_functionConstructorParametersEndPosition; }
bool operator==(const SourceCodeKey& other) const
{
return m_hash == other.m_hash
&& length() == other.length()
&& m_flags == other.m_flags
&& m_functionConstructorParametersEndPosition == other.m_functionConstructorParametersEndPosition
&& m_name == other.m_name
&& host() == other.host()
&& (m_sourceCode == other.m_sourceCode || string() == other.string());
}
struct Hash {
static unsigned hash(const SourceCodeKey& key) { return key.hash(); }
static bool equal(const SourceCodeKey& a, const SourceCodeKey& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = false;
};
struct HashTraits : SimpleClassHashTraits<SourceCodeKey> {
static constexpr bool hasIsEmptyValueFunction = true;
static bool isEmptyValue(const SourceCodeKey& key) { return key.isNull(); }
};
private:
UnlinkedSourceCode m_sourceCode;
String m_name;
SourceCodeFlags m_flags;
int m_functionConstructorParametersEndPosition;
unsigned m_hash;
};
} // namespace JSC
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