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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef vm_PropertyKey_h
#define vm_PropertyKey_h
#include "mozilla/HashFunctions.h" // mozilla::HashGeneric
#include "NamespaceImports.h" // js::PropertyKey
#include "js/HashTable.h" // js::DefaultHasher
#include "js/Id.h" // JS::PropertyKey
#include "vm/StringType.h" // JSAtom::hash
#include "vm/SymbolType.h" // JS::Symbol::hash
namespace js {
static MOZ_ALWAYS_INLINE HashNumber HashPropertyKey(PropertyKey key) {
// HashGeneric alone would work, but bits of atom and symbol addresses
// could then be recovered from the hash code. See bug 1330769.
if (MOZ_LIKELY(key.isAtom())) {
return key.toAtom()->hash();
}
if (key.isSymbol()) {
return key.toSymbol()->hash();
}
return mozilla::HashGeneric(key.asRawBits());
}
// Like HashPropertyKey but optimized for callers that only use atom or symbol
// keys.
static MOZ_ALWAYS_INLINE HashNumber
HashAtomOrSymbolPropertyKey(PropertyKey key) {
if (MOZ_LIKELY(key.isAtom())) {
return key.toAtom()->hash();
}
return key.toSymbol()->hash();
}
} // namespace js
namespace mozilla {
template <>
struct DefaultHasher<JS::PropertyKey> {
using Lookup = JS::PropertyKey;
static HashNumber hash(JS::PropertyKey key) {
return js::HashPropertyKey(key);
}
static bool match(JS::PropertyKey key1, JS::PropertyKey key2) {
return key1 == key2;
}
};
} // namespace mozilla
#endif /* vm_PropertyKey_h */
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