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/*
* Copyright (C) 2015 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.
*/
#ifndef VariableEnvironment_h
#define VariableEnvironment_h
#include "Identifier.h"
#include <wtf/HashMap.h>
namespace JSC {
struct VariableEnvironmentEntry {
public:
ALWAYS_INLINE bool isCaptured() const { return m_bits & IsCaptured; }
ALWAYS_INLINE bool isConst() const { return m_bits & IsConst; }
ALWAYS_INLINE bool isVar() const { return m_bits & IsVar; }
ALWAYS_INLINE bool isLet() const { return m_bits & IsLet; }
ALWAYS_INLINE bool isExported() const { return m_bits & IsExported; }
ALWAYS_INLINE bool isImported() const { return m_bits & IsImported; }
ALWAYS_INLINE bool isImportedNamespace() const { return m_bits & IsImportedNamespace; }
ALWAYS_INLINE void setIsCaptured() { m_bits |= IsCaptured; }
ALWAYS_INLINE void setIsConst() { m_bits |= IsConst; }
ALWAYS_INLINE void setIsVar() { m_bits |= IsVar; }
ALWAYS_INLINE void setIsLet() { m_bits |= IsLet; }
ALWAYS_INLINE void setIsExported() { m_bits |= IsExported; }
ALWAYS_INLINE void setIsImported() { m_bits |= IsImported; }
ALWAYS_INLINE void setIsImportedNamespace() { m_bits |= IsImportedNamespace; }
ALWAYS_INLINE void clearIsVar() { m_bits &= ~IsVar; }
private:
enum Traits {
IsCaptured = 1 << 0,
IsConst = 1 << 1,
IsVar = 1 << 2,
IsLet = 1 << 3,
IsExported = 1 << 4,
IsImported = 1 << 5,
IsImportedNamespace = 1 << 6
};
uint8_t m_bits { 0 };
};
struct VariableEnvironmentEntryHashTraits : HashTraits<VariableEnvironmentEntry> {
static const bool needsDestruction = false;
};
class VariableEnvironment {
private:
typedef HashMap<RefPtr<UniquedStringImpl>, VariableEnvironmentEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>, VariableEnvironmentEntryHashTraits> Map;
public:
ALWAYS_INLINE Map::iterator begin() { return m_map.begin(); }
ALWAYS_INLINE Map::iterator end() { return m_map.end(); }
ALWAYS_INLINE Map::const_iterator begin() const { return m_map.begin(); }
ALWAYS_INLINE Map::const_iterator end() const { return m_map.end(); }
ALWAYS_INLINE Map::AddResult add(const RefPtr<UniquedStringImpl>& identifier) { return m_map.add(identifier, VariableEnvironmentEntry()); }
ALWAYS_INLINE Map::AddResult add(const Identifier& identifier) { return add(identifier.impl()); }
ALWAYS_INLINE unsigned size() const { return m_map.size(); }
ALWAYS_INLINE bool contains(const RefPtr<UniquedStringImpl>& identifier) const { return m_map.contains(identifier); }
ALWAYS_INLINE bool remove(const RefPtr<UniquedStringImpl>& identifier) { return m_map.remove(identifier); }
ALWAYS_INLINE Map::iterator find(const RefPtr<UniquedStringImpl>& identifier) { return m_map.find(identifier); }
ALWAYS_INLINE Map::const_iterator find(const RefPtr<UniquedStringImpl>& identifier) const { return m_map.find(identifier); }
void swap(VariableEnvironment& other);
void markVariableAsCapturedIfDefined(const RefPtr<UniquedStringImpl>& identifier);
void markVariableAsCaptured(const RefPtr<UniquedStringImpl>& identifier);
void markAllVariablesAsCaptured();
bool hasCapturedVariables() const;
bool captures(UniquedStringImpl* identifier) const;
void markVariableAsImported(const RefPtr<UniquedStringImpl>& identifier);
void markVariableAsExported(const RefPtr<UniquedStringImpl>& identifier);
private:
Map m_map;
bool m_isEverythingCaptured { false };
};
} // namespace JSC
#endif // VariableEnvironment_h
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