mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
05a66409ca
This patch adds a move constructor for nsTHashtable and also lets nsTHashtable use its EntryType's move constructor, if one is available. This patch also adds move constructors for nsCharPtrHashKey and nsUnicharPtrHashKey. Using these new constructors, nsTHashtable will be able to avoid strdup()'ing all of its keys whenever it resizes the table.
579 lines
15 KiB
C++
579 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "pldhash.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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*/
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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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nsStringHashKey(KeyTypePointer aStr) : mStr(*aStr) { }
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nsStringHashKey(const nsStringHashKey& toCopy) : mStr(toCopy.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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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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nsStringCaseInsensitiveHashKey(KeyTypePointer aStr) : mStr(*aStr) { } //take it easy just deal HashKey
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nsStringCaseInsensitiveHashKey(const nsStringCaseInsensitiveHashKey& toCopy) : mStr(toCopy.mStr) { }
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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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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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nsCStringHashKey(const nsACString* aStr) : mStr(*aStr) { }
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nsCStringHashKey(const nsCStringHashKey& toCopy) : mStr(toCopy.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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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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nsUint32HashKey(KeyTypePointer aKey) : mValue(*aKey) { }
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nsUint32HashKey(const nsUint32HashKey& toCopy) : mValue(toCopy.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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nsUint64HashKey(KeyTypePointer aKey) : mValue(*aKey) { }
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nsUint64HashKey(const nsUint64HashKey& toCopy) : mValue(toCopy.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) { return PLDHashNumber(*aKey); }
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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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nsFloatHashKey(KeyTypePointer aKey) : mValue(*aKey) { }
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nsFloatHashKey(const nsFloatHashKey& toCopy) : mValue(toCopy.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) { return *reinterpret_cast<const uint32_t*>(aKey); }
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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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nsISupportsHashKey(const nsISupports* key) :
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mSupports(const_cast<nsISupports*>(key)) { }
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nsISupportsHashKey(const nsISupportsHashKey& toCopy) :
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mSupports(toCopy.mSupports) { }
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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_INT32(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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nsRefPtrHashKey(const T* key) :
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mKey(const_cast<T*>(key)) { }
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nsRefPtrHashKey(const nsRefPtrHashKey& toCopy) :
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mKey(toCopy.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_INT32(aKey) >>2;
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}
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enum { ALLOW_MEMMOVE = true };
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private:
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nsRefPtr<T> mKey;
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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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nsPtrHashKey(const T *key) : mKey(const_cast<T*>(key)) {}
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nsPtrHashKey(const nsPtrHashKey<T> &toCopy) : mKey(toCopy.mKey) {}
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~nsPtrHashKey() {}
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KeyType GetKey() const { return mKey; }
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bool KeyEquals(KeyTypePointer key) const { return key == mKey; }
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static KeyTypePointer KeyToPointer(KeyType key) { return key; }
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static PLDHashNumber HashKey(KeyTypePointer key)
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{
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return NS_PTR_TO_INT32(key) >> 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 T* KeyType that sets key to NULL 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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nsClearingPtrHashKey(const T *key) : nsPtrHashKey<T>(key) {}
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nsClearingPtrHashKey(const nsClearingPtrHashKey<T> &toCopy) :
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nsPtrHashKey<T>(toCopy) {}
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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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nsFuncPtrHashKey(const T *key) : mKey(*const_cast<T*>(key)) {}
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nsFuncPtrHashKey(const nsFuncPtrHashKey<T> &toCopy) : mKey(toCopy.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 key) const { return *key == mKey; }
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static KeyTypePointer KeyToPointer(KeyType key) { return &key; }
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static PLDHashNumber HashKey(KeyTypePointer key)
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{
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return NS_PTR_TO_INT32(*key) >> 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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nsIDHashKey(const nsID* inID) : mID(*inID) { }
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nsIDHashKey(const nsIDHashKey& toCopy) : mID(toCopy.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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nsDepCharHashKey(const char* aKey) { mKey = aKey; }
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nsDepCharHashKey(const nsDepCharHashKey& toCopy) { mKey = toCopy.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
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{
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return !strcmp(mKey, aKey);
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}
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static const char* KeyToPointer(const char* aKey) { return aKey; }
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static PLDHashNumber HashKey(const char* aKey) { return mozilla::HashString(aKey); }
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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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nsCharPtrHashKey(const char* aKey) : mKey(strdup(aKey)) { }
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nsCharPtrHashKey(const nsCharPtrHashKey& toCopy) : mKey(strdup(toCopy.mKey)) { }
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nsCharPtrHashKey(mozilla::MoveRef<nsCharPtrHashKey> other)
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: mKey(other->mKey)
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{
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other->mKey = nullptr;
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}
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~nsCharPtrHashKey() { if (mKey) free(const_cast<char *>(mKey)); }
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const char* GetKey() const { return mKey; }
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bool KeyEquals(KeyTypePointer aKey) const
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{
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return !strcmp(mKey, aKey);
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}
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static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey) { 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 PRUnichar*; 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 nsUnicharPtrHashKey : public PLDHashEntryHdr
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{
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public:
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typedef const PRUnichar* KeyType;
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typedef const PRUnichar* KeyTypePointer;
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nsUnicharPtrHashKey(const PRUnichar* aKey) : mKey(NS_strdup(aKey)) { }
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nsUnicharPtrHashKey(const nsUnicharPtrHashKey& toCopy) : mKey(NS_strdup(toCopy.mKey)) { }
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nsUnicharPtrHashKey(mozilla::MoveRef<nsUnicharPtrHashKey> other)
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: mKey(other->mKey)
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{
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other->mKey = nullptr;
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}
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~nsUnicharPtrHashKey() { if (mKey) NS_Free(const_cast<PRUnichar *>(mKey)); }
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const PRUnichar* GetKey() const { return mKey; }
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bool KeyEquals(KeyTypePointer aKey) const
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{
|
|
return !NS_strcmp(mKey, aKey);
|
|
}
|
|
|
|
static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }
|
|
static PLDHashNumber HashKey(KeyTypePointer aKey) { return mozilla::HashString(aKey); }
|
|
|
|
enum { ALLOW_MEMMOVE = true };
|
|
|
|
private:
|
|
const PRUnichar* mKey;
|
|
};
|
|
|
|
/**
|
|
* Hashtable key class to use with objects that support nsIHashable
|
|
*/
|
|
class nsHashableHashKey : public PLDHashEntryHdr
|
|
{
|
|
public:
|
|
typedef nsIHashable* KeyType;
|
|
typedef const nsIHashable* KeyTypePointer;
|
|
|
|
nsHashableHashKey(const nsIHashable* aKey) :
|
|
mKey(const_cast<nsIHashable*>(aKey)) { }
|
|
nsHashableHashKey(const nsHashableHashKey& toCopy) :
|
|
mKey(toCopy.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;
|
|
};
|
|
|
|
#endif // nsTHashKeys_h__
|