mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
691 lines
17 KiB
C++
691 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 "nsIHashable.h"
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#include "nsAutoPtr.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 "nsStringGlue.h"
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#include "nsCRTGlue.h"
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#include "nsUnicharUtils.h"
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#include <stdlib.h>
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#include <string.h>
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#include "mozilla/HashFunctions.h"
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#include "mozilla/Move.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
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HashString(const nsAString& aStr)
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{
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return HashString(aStr.BeginReading(), aStr.Length());
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}
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inline uint32_t
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HashString(const nsACString& aStr)
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{
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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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* nsPtrHashKey
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* nsClearingPtrHashKey
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* nsVoidPtrHashKey
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* nsClearingVoidPtrHashKey
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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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* nsHashableHashKey
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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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{
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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& aToCopy) : mStr(aToCopy.mStr) {}
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~nsStringHashKey() {}
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KeyType GetKey() const { return mStr; }
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bool KeyEquals(const KeyTypePointer aKey) const
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{
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return mStr.Equals(*aKey);
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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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{
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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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{
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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 nsString mStr;
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};
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#ifdef MOZILLA_INTERNAL_API
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/**
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* hashkey wrapper using nsAString KeyType
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*
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* This is internal-API only because nsCaseInsensitiveStringComparator 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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class nsStringCaseInsensitiveHashKey : public PLDHashEntryHdr
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{
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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 nsStringCaseInsensitiveHashKey(KeyTypePointer aStr)
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: mStr(*aStr)
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{
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// take it easy just deal HashKey
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}
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nsStringCaseInsensitiveHashKey(const nsStringCaseInsensitiveHashKey& aToCopy)
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: mStr(aToCopy.mStr)
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{
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}
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~nsStringCaseInsensitiveHashKey() {}
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KeyType GetKey() const { return mStr; }
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bool KeyEquals(const KeyTypePointer aKey) const
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{
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return mStr.Equals(*aKey, nsCaseInsensitiveStringComparator());
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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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{
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nsAutoString 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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{
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return GetKey().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
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}
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private:
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const nsString mStr;
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};
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#endif
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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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{
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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(const nsCStringHashKey& aToCopy) : mStr(aToCopy.mStr) {}
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~nsCStringHashKey() {}
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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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{
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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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{
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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 uint32_t KeyType
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*
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* @see nsTHashtable::EntryType for specification
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*/
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class nsUint32HashKey : public PLDHashEntryHdr
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{
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public:
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typedef const uint32_t& KeyType;
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typedef const uint32_t* KeyTypePointer;
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explicit nsUint32HashKey(KeyTypePointer aKey) : mValue(*aKey) {}
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nsUint32HashKey(const nsUint32HashKey& aToCopy) : mValue(aToCopy.mValue) {}
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~nsUint32HashKey() {}
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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) { return *aKey; }
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enum { ALLOW_MEMMOVE = true };
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private:
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const uint32_t mValue;
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};
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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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class nsUint64HashKey : public PLDHashEntryHdr
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{
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public:
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typedef const uint64_t& KeyType;
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typedef const uint64_t* KeyTypePointer;
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explicit nsUint64HashKey(KeyTypePointer aKey) : mValue(*aKey) {}
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nsUint64HashKey(const nsUint64HashKey& aToCopy) : mValue(aToCopy.mValue) {}
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~nsUint64HashKey() {}
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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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{
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return PLDHashNumber(*aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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const uint64_t mValue;
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};
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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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{
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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(const nsFloatHashKey& aToCopy) : mValue(aToCopy.mValue) {}
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~nsFloatHashKey() {}
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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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{
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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 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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{
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public:
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typedef nsISupports* KeyType;
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typedef const nsISupports* KeyTypePointer;
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explicit nsISupportsHashKey(const nsISupports* aKey)
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: mSupports(const_cast<nsISupports*>(aKey))
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{
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}
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nsISupportsHashKey(const nsISupportsHashKey& aToCopy)
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: mSupports(aToCopy.mSupports)
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{
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}
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~nsISupportsHashKey() {}
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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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{
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return NS_PTR_TO_UINT32(aKey) >> 2;
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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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{
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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 nsRefPtrHashKey(const T* aKey) : mKey(const_cast<T*>(aKey)) {}
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nsRefPtrHashKey(const nsRefPtrHashKey& aToCopy) : mKey(aToCopy.mKey) {}
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~nsRefPtrHashKey() {}
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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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{
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return NS_PTR_TO_UINT32(aKey) >> 2;
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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
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ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
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nsRefPtrHashKey<T>& aField,
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const char* aName,
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uint32_t aFlags = 0)
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{
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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 T* 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 nsPtrHashKey : public PLDHashEntryHdr
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{
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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 nsPtrHashKey(const T* aKey) : mKey(const_cast<T*>(aKey)) {}
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nsPtrHashKey(const nsPtrHashKey<T>& aToCopy) : mKey(aToCopy.mKey) {}
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~nsPtrHashKey() {}
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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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{
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return NS_PTR_TO_UINT32(aKey) >> 2;
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}
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enum { ALLOW_MEMMOVE = true };
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protected:
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T* MOZ_NON_OWNING_REF mKey;
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};
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/**
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* hashkey wrapper using T* KeyType that sets key to nullptr upon
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* destruction. Relevant only in cases where a memory pointer-scanner
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* like valgrind might get confused about stale references.
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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 nsClearingPtrHashKey : public nsPtrHashKey<T>
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{
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public:
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explicit nsClearingPtrHashKey(const T* aKey) : nsPtrHashKey<T>(aKey) {}
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nsClearingPtrHashKey(const nsClearingPtrHashKey<T>& aToCopy)
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: nsPtrHashKey<T>(aToCopy)
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{
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}
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~nsClearingPtrHashKey() { nsPtrHashKey<T>::mKey = nullptr; }
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};
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typedef nsPtrHashKey<const void> nsVoidPtrHashKey;
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typedef nsClearingPtrHashKey<const void> nsClearingVoidPtrHashKey;
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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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{
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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() {}
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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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{
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return NS_PTR_TO_UINT32(*aKey) >> 2;
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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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{
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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(const nsIDHashKey& aToCopy) : mID(aToCopy.mID) {}
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~nsIDHashKey() {}
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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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{
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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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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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{
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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(const nsDepCharHashKey& aToCopy) : mKey(aToCopy.mKey) {}
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~nsDepCharHashKey() {}
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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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{
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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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{
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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& aToCopy)
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: mKey(strdup(aToCopy.mKey))
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{
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}
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nsCharPtrHashKey(nsCharPtrHashKey&& aOther)
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: mKey(aOther.mKey)
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{
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aOther.mKey = nullptr;
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}
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~nsCharPtrHashKey()
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{
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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_strdup(aKey)) {}
|
|
nsUnicharPtrHashKey(const nsUnicharPtrHashKey& aToCopy)
|
|
: mKey(NS_strdup(aToCopy.mKey))
|
|
{
|
|
}
|
|
|
|
nsUnicharPtrHashKey(nsUnicharPtrHashKey&& aOther)
|
|
: mKey(aOther.mKey)
|
|
{
|
|
aOther.mKey = nullptr;
|
|
}
|
|
|
|
~nsUnicharPtrHashKey()
|
|
{
|
|
if (mKey) {
|
|
NS_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;
|
|
};
|
|
|
|
/**
|
|
* Hashtable key class to use with objects that support nsIHashable
|
|
*/
|
|
class nsHashableHashKey : public PLDHashEntryHdr
|
|
{
|
|
public:
|
|
typedef nsIHashable* KeyType;
|
|
typedef const nsIHashable* KeyTypePointer;
|
|
|
|
explicit nsHashableHashKey(const nsIHashable* aKey)
|
|
: mKey(const_cast<nsIHashable*>(aKey))
|
|
{
|
|
}
|
|
nsHashableHashKey(const nsHashableHashKey& aToCopy) : mKey(aToCopy.mKey) {}
|
|
~nsHashableHashKey() {}
|
|
|
|
nsIHashable* GetKey() const { return mKey; }
|
|
|
|
bool KeyEquals(const nsIHashable* aKey) const
|
|
{
|
|
bool eq;
|
|
if (NS_SUCCEEDED(mKey->Equals(const_cast<nsIHashable*>(aKey), &eq))) {
|
|
return eq;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static const nsIHashable* KeyToPointer(nsIHashable* aKey) { return aKey; }
|
|
static PLDHashNumber HashKey(const nsIHashable* aKey)
|
|
{
|
|
uint32_t code = 8888; // magic number if GetHashCode fails :-(
|
|
#ifdef DEBUG
|
|
nsresult rv =
|
|
#endif
|
|
const_cast<nsIHashable*>(aKey)->GetHashCode(&code);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv), "GetHashCode should not throw!");
|
|
return code;
|
|
}
|
|
|
|
enum { ALLOW_MEMMOVE = true };
|
|
|
|
private:
|
|
nsCOMPtr<nsIHashable> 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<T>& aOther) : mKey(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__
|