mirror of
https://github.com/mozilla/gecko-dev.git
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419 lines
13 KiB
C++
419 lines
13 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 nsBaseHashtable_h__
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#define nsBaseHashtable_h__
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Move.h"
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#include "nsTHashtable.h"
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#include "prlock.h"
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#include "nsDebug.h"
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template<class KeyClass,class DataType,class UserDataType>
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class nsBaseHashtable; // forward declaration
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/**
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* the private nsTHashtable::EntryType class used by nsBaseHashtable
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* @see nsTHashtable for the specification of this class
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* @see nsBaseHashtable for template parameters
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*/
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template<class KeyClass,class DataType>
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class nsBaseHashtableET : public KeyClass
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{
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public:
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DataType mData;
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friend class nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >;
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private:
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typedef typename KeyClass::KeyType KeyType;
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typedef typename KeyClass::KeyTypePointer KeyTypePointer;
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nsBaseHashtableET(KeyTypePointer aKey);
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nsBaseHashtableET(nsBaseHashtableET<KeyClass,DataType>&& toMove);
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~nsBaseHashtableET();
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};
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/**
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* templated hashtable for simple data types
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* This class manages simple data types that do not need construction or
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* destruction.
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*
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* @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
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* for a complete specification.
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* @param DataType the datatype stored in the hashtable,
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* for example, uint32_t or nsCOMPtr. If UserDataType is not the same,
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* DataType must implicitly cast to UserDataType
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* @param UserDataType the user sees, for example uint32_t or nsISupports*
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*/
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template<class KeyClass,class DataType,class UserDataType>
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class nsBaseHashtable :
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protected nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >
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{
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typedef mozilla::fallible_t fallible_t;
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef nsBaseHashtableET<KeyClass,DataType> EntryType;
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using nsTHashtable<EntryType>::Contains;
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nsBaseHashtable()
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{
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}
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explicit nsBaseHashtable(uint32_t aInitSize)
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: nsTHashtable<EntryType>(aInitSize)
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{
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}
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/**
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* Return the number of entries in the table.
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* @return number of entries
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*/
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uint32_t Count() const
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{ return nsTHashtable<EntryType>::Count(); }
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/**
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* retrieve the value for a key.
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* @param aKey the key to retreive
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* @param pData data associated with this key will be placed at this
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* pointer. If you only need to check if the key exists, pData
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* may be null.
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* @return true if the key exists. If key does not exist, pData is not
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* modified.
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*/
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bool Get(KeyType aKey, UserDataType* pData) const
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{
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EntryType* ent = this->GetEntry(aKey);
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if (!ent)
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return false;
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if (pData)
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*pData = ent->mData;
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return true;
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}
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/**
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* For pointer types, get the value, returning nullptr if the entry is not
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* present in the table.
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*
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* @param aKey the key to retrieve
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* @return The found value, or nullptr if no entry was found with the given key.
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* @note If nullptr values are stored in the table, it is not possible to
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* distinguish between a nullptr value and a missing entry.
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*/
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UserDataType Get(KeyType aKey) const
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{
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EntryType* ent = this->GetEntry(aKey);
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if (!ent)
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return 0;
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return ent->mData;
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}
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/**
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* put a new value for the associated key
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* @param aKey the key to put
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* @param aData the new data
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* @return always true, unless memory allocation failed
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*/
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void Put(KeyType aKey, const UserDataType& aData)
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{
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if (!Put(aKey, aData, fallible_t()))
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NS_ABORT_OOM(this->mTable.entrySize * this->mTable.entryCount);
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}
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bool Put(KeyType aKey, const UserDataType& aData, const fallible_t&) NS_WARN_UNUSED_RESULT
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{
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EntryType* ent = this->PutEntry(aKey);
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if (!ent)
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return false;
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ent->mData = aData;
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return true;
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}
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/**
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* remove the data for the associated key
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* @param aKey the key to remove from the hashtable
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*/
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void Remove(KeyType aKey) { this->RemoveEntry(aKey); }
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/**
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* function type provided by the application for enumeration.
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* @param aKey the key being enumerated
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* @param aData data being enumerated
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* @parm userArg passed unchanged from Enumerate
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* @return either
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* @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink or
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* @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
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*/
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typedef PLDHashOperator
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(* EnumReadFunction)(KeyType aKey,
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UserDataType aData,
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void* userArg);
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/**
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* enumerate entries in the hashtable, without allowing changes
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* @param enumFunc enumeration callback
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* @param userArg passed unchanged to the EnumReadFunction
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*/
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uint32_t EnumerateRead(EnumReadFunction enumFunc, void* userArg) const
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{
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NS_ASSERTION(this->mTable.entrySize,
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"nsBaseHashtable was not initialized properly.");
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s_EnumReadArgs enumData = { enumFunc, userArg };
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return PL_DHashTableEnumerate(const_cast<PLDHashTable*>(&this->mTable),
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s_EnumReadStub,
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&enumData);
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}
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/**
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* function type provided by the application for enumeration.
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* @param aKey the key being enumerated
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* @param aData Reference to data being enumerated, may be altered. e.g. for
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* nsInterfaceHashtable this is an nsCOMPtr reference...
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* @parm userArg passed unchanged from Enumerate
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* @return bitflag combination of
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* @link PLDHashOperator::PL_DHASH_REMOVE @endlink,
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* @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink, or
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* @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
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*/
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typedef PLDHashOperator
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(* EnumFunction)(KeyType aKey,
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DataType& aData,
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void* userArg);
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/**
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* enumerate entries in the hashtable, allowing changes. This
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* functions write-locks the hashtable.
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* @param enumFunc enumeration callback
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* @param userArg passed unchanged to the EnumFunction
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*/
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uint32_t Enumerate(EnumFunction enumFunc, void* userArg)
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{
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NS_ASSERTION(this->mTable.entrySize,
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"nsBaseHashtable was not initialized properly.");
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s_EnumArgs enumData = { enumFunc, userArg };
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return PL_DHashTableEnumerate(&this->mTable,
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s_EnumStub,
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&enumData);
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}
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/**
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* reset the hashtable, removing all entries
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*/
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void Clear() { nsTHashtable<EntryType>::Clear(); }
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/**
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* client must provide a SizeOfEntryExcludingThisFun function for
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* SizeOfExcludingThis.
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* @param aKey the key being enumerated
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* @param aData Reference to data being enumerated.
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* @param mallocSizeOf the function used to measure heap-allocated blocks
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* @param userArg passed unchanged from SizeOf{In,Ex}cludingThis
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* @return summed size of the things pointed to by the entries
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*/
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typedef size_t
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(* SizeOfEntryExcludingThisFun)(KeyType aKey,
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const DataType &aData,
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mozilla::MallocSizeOf mallocSizeOf,
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void* userArg);
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/**
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* Measure the size of the table's entry storage and the table itself.
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* If |sizeOfEntryExcludingThis| is non-nullptr, measure the size of things
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* pointed to by entries.
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*
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* @param sizeOfEntryExcludingThis
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* the <code>SizeOfEntryExcludingThisFun</code> function to call
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* @param mallocSizeOf the function used to meeasure heap-allocated blocks
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* @param userArg a point to pass to the
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* <code>SizeOfEntryExcludingThisFun</code> function
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* @return the summed size of the entries, the table, and the table's storage
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*/
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size_t SizeOfIncludingThis(SizeOfEntryExcludingThisFun sizeOfEntryExcludingThis,
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mozilla::MallocSizeOf mallocSizeOf, void *userArg = nullptr)
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{
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return mallocSizeOf(this) + this->SizeOfExcludingThis(sizeOfEntryExcludingThis,
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mallocSizeOf, userArg);
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}
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/**
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* Measure the size of the table's entry storage, and if
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* |sizeOfEntryExcludingThis| is non-nullptr, measure the size of things pointed
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* to by entries.
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*
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* @param sizeOfEntryExcludingThis the
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* <code>SizeOfEntryExcludingThisFun</code> function to call
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* @param mallocSizeOf the function used to measure heap-allocated blocks
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* @param userArg a pointer to pass to the
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* <code>SizeOfEntryExcludingThisFun</code> function
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* @return the summed size of all the entries
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*/
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size_t SizeOfExcludingThis(SizeOfEntryExcludingThisFun sizeOfEntryExcludingThis,
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mozilla::MallocSizeOf mallocSizeOf, void *userArg = nullptr) const
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{
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if (sizeOfEntryExcludingThis) {
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s_SizeOfArgs args = { sizeOfEntryExcludingThis, userArg };
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return PL_DHashTableSizeOfExcludingThis(&this->mTable, s_SizeOfStub,
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mallocSizeOf, &args);
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}
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return PL_DHashTableSizeOfExcludingThis(&this->mTable, nullptr,
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mallocSizeOf);
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}
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#ifdef DEBUG
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using nsTHashtable<EntryType>::MarkImmutable;
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#endif
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protected:
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/**
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* used internally during EnumerateRead. Allocated on the stack.
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* @param func the enumerator passed to EnumerateRead
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* @param userArg the userArg passed to EnumerateRead
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*/
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struct s_EnumReadArgs
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{
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EnumReadFunction func;
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void* userArg;
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};
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static PLDHashOperator s_EnumReadStub(PLDHashTable *table,
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PLDHashEntryHdr *hdr,
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uint32_t number,
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void *arg);
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struct s_EnumArgs
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{
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EnumFunction func;
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void* userArg;
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};
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static PLDHashOperator s_EnumStub(PLDHashTable *table,
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PLDHashEntryHdr *hdr,
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uint32_t number,
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void *arg);
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struct s_SizeOfArgs
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{
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SizeOfEntryExcludingThisFun func;
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void* userArg;
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};
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static size_t s_SizeOfStub(PLDHashEntryHdr *entry,
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mozilla::MallocSizeOf mallocSizeOf,
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void *arg);
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};
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class nsCycleCollectionTraversalCallback;
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struct MOZ_STACK_CLASS nsBaseHashtableCCTraversalData
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{
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nsBaseHashtableCCTraversalData(nsCycleCollectionTraversalCallback& aCallback,
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const char* aName,
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uint32_t aFlags)
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: mCallback(aCallback),
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mName(aName),
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mFlags(aFlags)
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{
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}
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nsCycleCollectionTraversalCallback& mCallback;
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const char* mName;
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uint32_t mFlags;
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};
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template <typename K, typename T>
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PLDHashOperator
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ImplCycleCollectionTraverse_EnumFunc(K aKey,
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T aData,
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void* aUserData)
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{
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nsBaseHashtableCCTraversalData* userData =
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static_cast<nsBaseHashtableCCTraversalData*>(aUserData);
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CycleCollectionNoteChild(userData->mCallback,
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aData,
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userData->mName,
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userData->mFlags);
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return PL_DHASH_NEXT;
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}
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//
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// nsBaseHashtableET definitions
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//
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template<class KeyClass,class DataType>
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nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET(KeyTypePointer aKey) :
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KeyClass(aKey)
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{ }
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template<class KeyClass,class DataType>
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nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET
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(nsBaseHashtableET<KeyClass,DataType>&& toMove) :
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KeyClass(mozilla::Move(toMove)),
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mData(mozilla::Move(toMove.mData))
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{ }
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template<class KeyClass,class DataType>
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nsBaseHashtableET<KeyClass,DataType>::~nsBaseHashtableET()
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{ }
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//
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// nsBaseHashtable definitions
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//
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template<class KeyClass,class DataType,class UserDataType>
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PLDHashOperator
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nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumReadStub
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(PLDHashTable *table, PLDHashEntryHdr *hdr, uint32_t number, void* arg)
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{
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EntryType* ent = static_cast<EntryType*>(hdr);
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s_EnumReadArgs* eargs = (s_EnumReadArgs*) arg;
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PLDHashOperator res = (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
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NS_ASSERTION( !(res & PL_DHASH_REMOVE ),
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"PL_DHASH_REMOVE return during const enumeration; ignoring.");
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if (res & PL_DHASH_STOP)
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return PL_DHASH_STOP;
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return PL_DHASH_NEXT;
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}
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template<class KeyClass,class DataType,class UserDataType>
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PLDHashOperator
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nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumStub
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(PLDHashTable *table, PLDHashEntryHdr *hdr, uint32_t number, void* arg)
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{
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EntryType* ent = static_cast<EntryType*>(hdr);
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s_EnumArgs* eargs = (s_EnumArgs*) arg;
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return (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
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}
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template<class KeyClass,class DataType,class UserDataType>
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size_t
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nsBaseHashtable<KeyClass,DataType,UserDataType>::s_SizeOfStub
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(PLDHashEntryHdr *hdr, mozilla::MallocSizeOf mallocSizeOf, void *arg)
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{
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EntryType* ent = static_cast<EntryType*>(hdr);
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s_SizeOfArgs* eargs = static_cast<s_SizeOfArgs*>(arg);
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return (eargs->func)(ent->GetKey(), ent->mData, mallocSizeOf, eargs->userArg);
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}
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#endif // nsBaseHashtable_h__
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