VariableEnvironment.h [plain text]
#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 bool isFunction() const { return m_bits & IsFunction; }
ALWAYS_INLINE bool isParameter() const { return m_bits & IsParameter; }
ALWAYS_INLINE bool isSloppyModeHoistingCandidate() const { return m_bits & IsSloppyModeHoistingCandidate; }
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 setIsFunction() { m_bits |= IsFunction; }
ALWAYS_INLINE void setIsParameter() { m_bits |= IsParameter; }
ALWAYS_INLINE void setIsSloppyModeHoistingCandidate() { m_bits |= IsSloppyModeHoistingCandidate; }
ALWAYS_INLINE void clearIsVar() { m_bits &= ~IsVar; }
private:
enum Traits : uint16_t {
IsCaptured = 1 << 0,
IsConst = 1 << 1,
IsVar = 1 << 2,
IsLet = 1 << 3,
IsExported = 1 << 4,
IsImported = 1 << 5,
IsImportedNamespace = 1 << 6,
IsFunction = 1 << 7,
IsParameter = 1 << 8,
IsSloppyModeHoistingCandidate = 1 << 9
};
uint16_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:
VariableEnvironment()
{ }
VariableEnvironment(VariableEnvironment&& other)
: m_map(WTFMove(other.m_map))
, m_isEverythingCaptured(other.m_isEverythingCaptured)
{ }
VariableEnvironment(const VariableEnvironment&) = default;
VariableEnvironment& operator=(const VariableEnvironment&) = default;
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 };
};
}
#endif // VariableEnvironment_h