forked from mirrors/gecko-dev
9b5ea61bed
* DefaultHasher<T*> used HashGeneric<size_t> * nsPtrHashKey<T> used HashGeneric<T*> * nsRefPtrHashKey<T> used NS_PTR_TO_UINT32 >> 2 Make sure to always use HashGeneric<T*> for these. Remove unused / redundant hash keys. Differential Revision: https://phabricator.services.mozilla.com/D186553
612 lines
17 KiB
C++
612 lines
17 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsTHashKeys_h__
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#define nsTHashKeys_h__
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#include "nsID.h"
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#include "nsISupports.h"
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#include "nsCOMPtr.h"
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#include "PLDHashTable.h"
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#include <new>
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#include "nsString.h"
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#include "nsCRTGlue.h"
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#include "nsUnicharUtils.h"
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#include "nsPointerHashKeys.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <type_traits>
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#include <utility>
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#include "mozilla/HashFunctions.h"
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namespace mozilla {
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// These are defined analogously to the HashString overloads in mfbt.
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inline uint32_t HashString(const nsAString& aStr) {
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return HashString(aStr.BeginReading(), aStr.Length());
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}
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inline uint32_t HashString(const nsACString& aStr) {
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return HashString(aStr.BeginReading(), aStr.Length());
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}
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} // namespace mozilla
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/** @file nsHashKeys.h
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* standard HashKey classes for nsBaseHashtable and relatives. Each of these
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* classes follows the nsTHashtable::EntryType specification
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*
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* Lightweight keytypes provided here:
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* nsStringHashKey
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* nsCStringHashKey
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* nsUint32HashKey
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* nsUint64HashKey
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* nsFloatHashKey
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* IntPtrHashKey
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* nsPtrHashKey
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* nsVoidPtrHashKey
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* nsISupportsHashKey
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* nsIDHashKey
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* nsDepCharHashKey
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* nsCharPtrHashKey
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* nsUnicharPtrHashKey
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* nsGenericHashKey
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*/
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/**
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* hashkey wrapper using nsAString KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsStringHashKey : public PLDHashEntryHdr {
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public:
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typedef const nsAString& KeyType;
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typedef const nsAString* KeyTypePointer;
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explicit nsStringHashKey(KeyTypePointer aStr) : mStr(*aStr) {}
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nsStringHashKey(const nsStringHashKey&) = delete;
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nsStringHashKey(nsStringHashKey&& aToMove)
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: PLDHashEntryHdr(std::move(aToMove)), mStr(std::move(aToMove.mStr)) {}
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~nsStringHashKey() = default;
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KeyType GetKey() const { return mStr; }
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bool KeyEquals(const KeyTypePointer aKey) const { return mStr.Equals(*aKey); }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(const KeyTypePointer aKey) {
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return mozilla::HashString(*aKey);
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}
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#ifdef MOZILLA_INTERNAL_API
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// To avoid double-counting, only measure the string if it is unshared.
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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return GetKey().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
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}
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#endif
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enum { ALLOW_MEMMOVE = true };
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private:
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nsString mStr;
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};
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#ifdef MOZILLA_INTERNAL_API
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namespace mozilla::detail {
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template <class CharT, bool Unicode = true>
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struct comparatorTraits {};
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template <>
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struct comparatorTraits<char, false> {
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static int caseInsensitiveCompare(const char* aLhs, const char* aRhs,
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size_t aLhsLength, size_t aRhsLength) {
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return nsCaseInsensitiveCStringComparator(aLhs, aRhs, aLhsLength,
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aRhsLength);
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};
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};
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template <>
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struct comparatorTraits<char, true> {
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static int caseInsensitiveCompare(const char* aLhs, const char* aRhs,
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size_t aLhsLength, size_t aRhsLength) {
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return nsCaseInsensitiveUTF8StringComparator(aLhs, aRhs, aLhsLength,
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aRhsLength);
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};
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};
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template <>
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struct comparatorTraits<char16_t, true> {
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static int caseInsensitiveCompare(const char16_t* aLhs, const char16_t* aRhs,
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size_t aLhsLength, size_t aRhsLength) {
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return nsCaseInsensitiveStringComparator(aLhs, aRhs, aLhsLength,
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aRhsLength);
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};
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};
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} // namespace mozilla::detail
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/**
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* This is internal-API only because nsCaseInsensitive{C}StringComparator is
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* internal-only.
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*
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* @see nsTHashtable::EntryType for specification
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*/
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template <typename T, bool Unicode>
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class nsTStringCaseInsensitiveHashKey : public PLDHashEntryHdr {
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public:
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typedef const nsTSubstring<T>& KeyType;
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typedef const nsTSubstring<T>* KeyTypePointer;
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explicit nsTStringCaseInsensitiveHashKey(KeyTypePointer aStr) : mStr(*aStr) {
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// take it easy just deal HashKey
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}
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nsTStringCaseInsensitiveHashKey(const nsTStringCaseInsensitiveHashKey&) =
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delete;
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nsTStringCaseInsensitiveHashKey(nsTStringCaseInsensitiveHashKey&& aToMove)
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: PLDHashEntryHdr(std::move(aToMove)), mStr(std::move(aToMove.mStr)) {}
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~nsTStringCaseInsensitiveHashKey() = default;
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KeyType GetKey() const { return mStr; }
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bool KeyEquals(const KeyTypePointer aKey) const {
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using comparator = typename mozilla::detail::comparatorTraits<T, Unicode>;
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return mStr.Equals(*aKey, comparator::caseInsensitiveCompare);
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}
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(const KeyTypePointer aKey) {
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nsTAutoString<T> tmKey(*aKey);
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ToLowerCase(tmKey);
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return mozilla::HashString(tmKey);
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}
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enum { ALLOW_MEMMOVE = true };
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// To avoid double-counting, only measure the string if it is unshared.
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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return GetKey().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
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}
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private:
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const nsTString<T> mStr;
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};
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using nsStringCaseInsensitiveHashKey =
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nsTStringCaseInsensitiveHashKey<char16_t, true>;
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using nsCStringASCIICaseInsensitiveHashKey =
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nsTStringCaseInsensitiveHashKey<char, false>;
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using nsCStringUTF8CaseInsensitiveHashKey =
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nsTStringCaseInsensitiveHashKey<char, true>;
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#endif // MOZILLA_INTERNAL_API
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/**
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* hashkey wrapper using nsACString KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsCStringHashKey : public PLDHashEntryHdr {
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public:
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typedef const nsACString& KeyType;
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typedef const nsACString* KeyTypePointer;
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explicit nsCStringHashKey(const nsACString* aStr) : mStr(*aStr) {}
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nsCStringHashKey(nsCStringHashKey&& aOther)
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: PLDHashEntryHdr(std::move(aOther)), mStr(std::move(aOther.mStr)) {}
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~nsCStringHashKey() = default;
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KeyType GetKey() const { return mStr; }
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bool KeyEquals(KeyTypePointer aKey) const { return mStr.Equals(*aKey); }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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return mozilla::HashString(*aKey);
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}
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#ifdef MOZILLA_INTERNAL_API
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// To avoid double-counting, only measure the string if it is unshared.
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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return GetKey().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
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}
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#endif
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enum { ALLOW_MEMMOVE = true };
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private:
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const nsCString mStr;
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};
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/**
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* hashkey wrapper using integral or enum KeyTypes
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*
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* @see nsTHashtable::EntryType for specification
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*/
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template <typename T,
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std::enable_if_t<std::is_integral_v<T> || std::is_enum_v<T>, int> = 0>
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class nsIntegralHashKey : public PLDHashEntryHdr {
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public:
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using KeyType = const T&;
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using KeyTypePointer = const T*;
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explicit nsIntegralHashKey(KeyTypePointer aKey) : mValue(*aKey) {}
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nsIntegralHashKey(nsIntegralHashKey&& aOther) noexcept
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: PLDHashEntryHdr(std::move(aOther)), mValue(aOther.mValue) {}
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~nsIntegralHashKey() = default;
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KeyType GetKey() const { return mValue; }
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bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mValue; }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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return mozilla::HashGeneric(*aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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const T mValue;
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};
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/**
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* hashkey wrapper using uint32_t KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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using nsUint32HashKey = nsIntegralHashKey<uint32_t>;
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/**
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* hashkey wrapper using uint64_t KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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using nsUint64HashKey = nsIntegralHashKey<uint64_t>;
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/**
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* hashkey wrapper using float KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsFloatHashKey : public PLDHashEntryHdr {
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public:
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typedef const float& KeyType;
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typedef const float* KeyTypePointer;
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explicit nsFloatHashKey(KeyTypePointer aKey) : mValue(*aKey) {}
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nsFloatHashKey(nsFloatHashKey&& aOther)
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: PLDHashEntryHdr(std::move(aOther)), mValue(std::move(aOther.mValue)) {}
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~nsFloatHashKey() = default;
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KeyType GetKey() const { return mValue; }
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bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mValue; }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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return *reinterpret_cast<const uint32_t*>(aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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const float mValue;
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};
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/**
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* hashkey wrapper using intptr_t KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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using IntPtrHashKey = nsIntegralHashKey<intptr_t>;
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/**
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* hashkey wrapper using nsISupports* KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsISupportsHashKey : public PLDHashEntryHdr {
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public:
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using KeyType = nsISupports*;
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using KeyTypePointer = const nsISupports*;
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explicit nsISupportsHashKey(const nsISupports* aKey)
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: mSupports(const_cast<nsISupports*>(aKey)) {}
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nsISupportsHashKey(nsISupportsHashKey&& aOther) = default;
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~nsISupportsHashKey() = default;
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KeyType GetKey() const { return mSupports; }
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bool KeyEquals(KeyTypePointer aKey) const { return aKey == mSupports; }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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return mozilla::HashGeneric(aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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nsCOMPtr<nsISupports> mSupports;
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};
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/**
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* hashkey wrapper using refcounted * KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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template <class T>
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class nsRefPtrHashKey : public PLDHashEntryHdr {
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public:
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using KeyType = T*;
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using KeyTypePointer = const T*;
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explicit nsRefPtrHashKey(const T* aKey) : mKey(const_cast<T*>(aKey)) {}
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nsRefPtrHashKey(nsRefPtrHashKey&& aOther) = default;
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~nsRefPtrHashKey() = default;
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KeyType GetKey() const { return mKey; }
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bool KeyEquals(KeyTypePointer aKey) const { return aKey == mKey; }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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return mozilla::HashGeneric(aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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RefPtr<T> mKey;
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};
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template <class T>
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inline void ImplCycleCollectionTraverse(
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nsCycleCollectionTraversalCallback& aCallback, nsRefPtrHashKey<T>& aField,
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const char* aName, uint32_t aFlags = 0) {
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CycleCollectionNoteChild(aCallback, aField.GetKey(), aName, aFlags);
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}
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/**
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* hashkey wrapper using a function pointer KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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template <class T>
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class nsFuncPtrHashKey : public PLDHashEntryHdr {
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public:
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typedef T& KeyType;
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typedef const T* KeyTypePointer;
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explicit nsFuncPtrHashKey(const T* aKey) : mKey(*const_cast<T*>(aKey)) {}
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nsFuncPtrHashKey(const nsFuncPtrHashKey<T>& aToCopy) : mKey(aToCopy.mKey) {}
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~nsFuncPtrHashKey() = default;
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KeyType GetKey() const { return const_cast<T&>(mKey); }
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bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mKey; }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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return mozilla::HashGeneric(*aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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protected:
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T mKey;
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};
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/**
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* hashkey wrapper using nsID KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsIDHashKey : public PLDHashEntryHdr {
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public:
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typedef const nsID& KeyType;
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typedef const nsID* KeyTypePointer;
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explicit nsIDHashKey(const nsID* aInID) : mID(*aInID) {}
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nsIDHashKey(nsIDHashKey&& aOther)
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: PLDHashEntryHdr(std::move(aOther)), mID(std::move(aOther.mID)) {}
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~nsIDHashKey() = default;
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KeyType GetKey() const { return mID; }
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bool KeyEquals(KeyTypePointer aKey) const { return aKey->Equals(mID); }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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// Hash the nsID object's raw bytes.
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return mozilla::HashBytes(aKey, sizeof(KeyType));
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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nsID mID;
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};
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/**
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* hashkey wrapper using nsID* KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsIDPointerHashKey : public PLDHashEntryHdr {
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public:
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typedef const nsID* KeyType;
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typedef const nsID* KeyTypePointer;
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explicit nsIDPointerHashKey(const nsID* aInID) : mID(aInID) {}
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nsIDPointerHashKey(nsIDPointerHashKey&& aOther)
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: PLDHashEntryHdr(std::move(aOther)), mID(aOther.mID) {}
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~nsIDPointerHashKey() = default;
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KeyType GetKey() const { return mID; }
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bool KeyEquals(KeyTypePointer aKey) const { return aKey->Equals(*mID); }
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static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) {
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// Hash the nsID object's raw bytes.
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return mozilla::HashBytes(aKey, sizeof(*aKey));
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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const nsID* mID;
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};
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/**
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* hashkey wrapper for "dependent" const char*; this class does not "own"
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* its string pointer.
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*
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* This class must only be used if the strings have a lifetime longer than
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* the hashtable they occupy. This normally occurs only for static
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* strings or strings that have been arena-allocated.
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsDepCharHashKey : public PLDHashEntryHdr {
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public:
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typedef const char* KeyType;
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typedef const char* KeyTypePointer;
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explicit nsDepCharHashKey(const char* aKey) : mKey(aKey) {}
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nsDepCharHashKey(nsDepCharHashKey&& aOther)
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: PLDHashEntryHdr(std::move(aOther)), mKey(std::move(aOther.mKey)) {}
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~nsDepCharHashKey() = default;
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const char* GetKey() const { return mKey; }
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bool KeyEquals(const char* aKey) const { return !strcmp(mKey, aKey); }
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static const char* KeyToPointer(const char* aKey) { return aKey; }
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static PLDHashNumber HashKey(const char* aKey) {
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return mozilla::HashString(aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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const char* mKey;
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};
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/**
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* hashkey wrapper for const char*; at construction, this class duplicates
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* a string pointed to by the pointer so that it doesn't matter whether or not
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* the string lives longer than the hash table.
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*/
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class nsCharPtrHashKey : public PLDHashEntryHdr {
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public:
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typedef const char* KeyType;
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typedef const char* KeyTypePointer;
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explicit nsCharPtrHashKey(const char* aKey) : mKey(strdup(aKey)) {}
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nsCharPtrHashKey(const nsCharPtrHashKey&) = delete;
|
|
nsCharPtrHashKey(nsCharPtrHashKey&& aOther)
|
|
: PLDHashEntryHdr(std::move(aOther)), mKey(aOther.mKey) {
|
|
aOther.mKey = nullptr;
|
|
}
|
|
|
|
~nsCharPtrHashKey() {
|
|
if (mKey) {
|
|
free(const_cast<char*>(mKey));
|
|
}
|
|
}
|
|
|
|
const char* GetKey() const { return mKey; }
|
|
bool KeyEquals(KeyTypePointer aKey) const { return !strcmp(mKey, aKey); }
|
|
|
|
static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
|
|
static PLDHashNumber HashKey(KeyTypePointer aKey) {
|
|
return mozilla::HashString(aKey);
|
|
}
|
|
|
|
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
|
|
return aMallocSizeOf(mKey);
|
|
}
|
|
|
|
enum { ALLOW_MEMMOVE = true };
|
|
|
|
private:
|
|
const char* mKey;
|
|
};
|
|
|
|
/**
|
|
* hashkey wrapper for const char16_t*; at construction, this class duplicates
|
|
* a string pointed to by the pointer so that it doesn't matter whether or not
|
|
* the string lives longer than the hash table.
|
|
*/
|
|
class nsUnicharPtrHashKey : public PLDHashEntryHdr {
|
|
public:
|
|
typedef const char16_t* KeyType;
|
|
typedef const char16_t* KeyTypePointer;
|
|
|
|
explicit nsUnicharPtrHashKey(const char16_t* aKey) : mKey(NS_xstrdup(aKey)) {}
|
|
nsUnicharPtrHashKey(const nsUnicharPtrHashKey& aToCopy) = delete;
|
|
nsUnicharPtrHashKey(nsUnicharPtrHashKey&& aOther)
|
|
: PLDHashEntryHdr(std::move(aOther)), mKey(aOther.mKey) {
|
|
aOther.mKey = nullptr;
|
|
}
|
|
|
|
~nsUnicharPtrHashKey() {
|
|
if (mKey) {
|
|
free(const_cast<char16_t*>(mKey));
|
|
}
|
|
}
|
|
|
|
const char16_t* GetKey() const { return mKey; }
|
|
bool KeyEquals(KeyTypePointer aKey) const { return !NS_strcmp(mKey, aKey); }
|
|
|
|
static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
|
|
static PLDHashNumber HashKey(KeyTypePointer aKey) {
|
|
return mozilla::HashString(aKey);
|
|
}
|
|
|
|
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
|
|
return aMallocSizeOf(mKey);
|
|
}
|
|
|
|
enum { ALLOW_MEMMOVE = true };
|
|
|
|
private:
|
|
const char16_t* mKey;
|
|
};
|
|
|
|
namespace mozilla {
|
|
|
|
template <typename T>
|
|
PLDHashNumber Hash(const T& aValue) {
|
|
return aValue.Hash();
|
|
}
|
|
|
|
} // namespace mozilla
|
|
|
|
/**
|
|
* Hashtable key class to use with objects for which Hash() and operator==()
|
|
* are defined.
|
|
*/
|
|
template <typename T>
|
|
class nsGenericHashKey : public PLDHashEntryHdr {
|
|
public:
|
|
typedef const T& KeyType;
|
|
typedef const T* KeyTypePointer;
|
|
|
|
explicit nsGenericHashKey(KeyTypePointer aKey) : mKey(*aKey) {}
|
|
nsGenericHashKey(const nsGenericHashKey&) = delete;
|
|
nsGenericHashKey(nsGenericHashKey&& aOther)
|
|
: PLDHashEntryHdr(std::move(aOther)), mKey(std::move(aOther.mKey)) {}
|
|
|
|
KeyType GetKey() const { return mKey; }
|
|
bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mKey; }
|
|
|
|
static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
|
|
static PLDHashNumber HashKey(KeyTypePointer aKey) {
|
|
return ::mozilla::Hash(*aKey);
|
|
}
|
|
enum { ALLOW_MEMMOVE = true };
|
|
|
|
private:
|
|
T mKey;
|
|
};
|
|
|
|
#endif // nsTHashKeys_h__
|