mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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535 lines
16 KiB
C++
535 lines
16 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 "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>& toCopy);
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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, PRUint32 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 PRUint32 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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// default constructor+destructor are fine
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/**
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* Initialize the object.
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* @param initSize the initial number of buckets in the hashtable,
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* default 16
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* locking on all class methods
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* @return true if the object was initialized properly.
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*/
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void Init(PRUint32 initSize = PL_DHASH_MIN_SIZE)
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{ nsTHashtable<EntryType>::Init(initSize); }
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bool Init(const fallible_t&) NS_WARN_UNUSED_RESULT
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{ return Init(PL_DHASH_MIN_SIZE, fallible_t()); }
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bool Init(PRUint32 initSize, const fallible_t&) NS_WARN_UNUSED_RESULT
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{ return nsTHashtable<EntryType>::Init(initSize, fallible_t()); }
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/**
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* Check whether the table has been initialized.
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* This function is especially useful for static hashtables.
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* @return true if the table has been initialized.
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*/
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bool IsInitialized() const { return !!this->mTable.entrySize; }
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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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PRUint32 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, UserDataType aData)
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{
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if (!Put(aKey, aData, fallible_t()))
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NS_RUNTIMEABORT("OOM");
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}
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bool Put(KeyType aKey, 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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PRUint32 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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PRUint32 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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nsMallocSizeOfFun 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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nsMallocSizeOfFun 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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nsMallocSizeOfFun mallocSizeOf, void *userArg = nullptr) const
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{
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if (!IsInitialized()) {
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return 0;
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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, NULL, mallocSizeOf);
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}
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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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PRUint32 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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PRUint32 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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nsMallocSizeOfFun mallocSizeOf,
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void *arg);
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};
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/**
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* This class is a thread-safe version of nsBaseHashtable. It only exposes
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* an infallible API.
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*/
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template<class KeyClass,class DataType,class UserDataType>
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class nsBaseHashtableMT :
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protected nsBaseHashtable<KeyClass,DataType,UserDataType>
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{
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public:
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EntryType EntryType;
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::KeyType KeyType;
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumFunction EnumFunction;
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumReadFunction EnumReadFunction;
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nsBaseHashtableMT() : mLock(nullptr) { }
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~nsBaseHashtableMT();
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void Init(PRUint32 initSize = PL_DHASH_MIN_SIZE);
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bool IsInitialized() const { return mLock != nullptr; }
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PRUint32 Count() const;
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bool Get(KeyType aKey, UserDataType* pData) const;
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void Put(KeyType aKey, UserDataType aData);
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void Remove(KeyType aKey);
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PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const;
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PRUint32 Enumerate(EnumFunction enumFunc, void* userArg);
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void Clear();
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protected:
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PRLock* mLock;
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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>& toCopy) :
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KeyClass(toCopy),
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mData(toCopy.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, PRUint32 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, PRUint32 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, nsMallocSizeOfFun 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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//
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// nsBaseHashtableMT definitions
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//
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template<class KeyClass,class DataType,class UserDataType>
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::~nsBaseHashtableMT()
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{
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if (this->mLock)
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PR_DestroyLock(this->mLock);
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}
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template<class KeyClass,class DataType,class UserDataType>
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void
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Init(PRUint32 initSize)
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{
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if (!nsTHashtable<EntryType>::IsInitialized())
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nsTHashtable<EntryType>::Init(initSize);
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this->mLock = PR_NewLock();
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if (!this->mLock)
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NS_RUNTIMEABORT("OOM");
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRUint32
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Count() const
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{
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PR_Lock(this->mLock);
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PRUint32 count = nsTHashtable<EntryType>::Count();
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PR_Unlock(this->mLock);
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return count;
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}
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template<class KeyClass,class DataType,class UserDataType>
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bool
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Get(KeyType aKey,
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UserDataType* pData) const
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{
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PR_Lock(this->mLock);
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bool res =
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Get(aKey, pData);
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PR_Unlock(this->mLock);
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return res;
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}
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template<class KeyClass,class DataType,class UserDataType>
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void
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Put(KeyType aKey,
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UserDataType aData)
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{
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PR_Lock(this->mLock);
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Put(aKey, aData);
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PR_Unlock(this->mLock);
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}
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template<class KeyClass,class DataType,class UserDataType>
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void
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Remove(KeyType aKey)
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{
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PR_Lock(this->mLock);
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Remove(aKey);
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PR_Unlock(this->mLock);
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRUint32
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::EnumerateRead
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(EnumReadFunction fEnumCall, void* userArg) const
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{
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PR_Lock(this->mLock);
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PRUint32 count =
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumerateRead(fEnumCall, userArg);
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PR_Unlock(this->mLock);
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return count;
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRUint32
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Enumerate
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(EnumFunction fEnumCall, void* userArg)
|
|
{
|
|
PR_Lock(this->mLock);
|
|
PRUint32 count =
|
|
nsBaseHashtable<KeyClass,DataType,UserDataType>::Enumerate(fEnumCall, userArg);
|
|
PR_Unlock(this->mLock);
|
|
|
|
return count;
|
|
}
|
|
|
|
template<class KeyClass,class DataType,class UserDataType>
|
|
void
|
|
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Clear()
|
|
{
|
|
PR_Lock(this->mLock);
|
|
nsBaseHashtable<KeyClass,DataType,UserDataType>::Clear();
|
|
PR_Unlock(this->mLock);
|
|
}
|
|
|
|
#endif // nsBaseHashtable_h__
|