QDeclarativeJS::MemoryPool Class Reference

#include <qdeclarativejsmemorypool_p.h>

Inheritance diagram for QDeclarativeJS::MemoryPool:

Public Types
enum	{ maxBlockCount = -1 }
enum	{ defaultBlockSize = 1 << 12 }

Public Functions
char *	allocate (int bytes)
int	bytesAllocated () const
	MemoryPool ()
virtual	~MemoryPool ()
Public Functions inherited from QSharedData
	QSharedData ()
	Constructs a QSharedData object with a reference count of 0. More...
	QSharedData (const QSharedData &)
	Constructs a QSharedData object with reference count 0. More...

Properties
int	m_blockIndex
char *	m_currentBlock
int	m_currentBlockSize
int	m_currentIndex
char **	m_storage

Additional Inherited Members
Public Variables inherited from QSharedData
QAtomicInt	ref

Detailed Description

Definition at line 67 of file qdeclarativejsmemorypool_p.h.

Enumerations

anonymous enum

anonymous enum

Enumerator
maxBlockCount

Definition at line 70 of file qdeclarativejsmemorypool_p.h.

{ maxBlockCount = -1 };

anonymous enum

anonymous enum

Enumerator
defaultBlockSize

Definition at line 71 of file qdeclarativejsmemorypool_p.h.

{ defaultBlockSize = 1 << 12 };

Constructors and Destructors

MemoryPool()

QDeclarativeJS::MemoryPool::MemoryPool ( )

inline

Definition at line 73 of file qdeclarativejsmemorypool_p.h.

                 {
        m_blockIndex = maxBlockCount;
        m_currentIndex = 0;
        m_storage = 0;
        m_currentBlock = 0;
        m_currentBlockSize = 0;
    }

~MemoryPool()

virtual QDeclarativeJS::MemoryPool::~MemoryPool ( )

inlinevirtual

Definition at line 81 of file qdeclarativejsmemorypool_p.h.

                          {
        for (int index = 0; index < m_blockIndex + 1; ++index)
            qFree(m_storage[index]);

        qFree(m_storage);
    }

Functions

allocate()

char* QDeclarativeJS::MemoryPool::allocate ( int  bytes )

inline

Definition at line 88 of file qdeclarativejsmemorypool_p.h.

Referenced by QDeclarativeJS::makeAstNode().

                              {
        bytes += (8 - bytes) & 7; // ensure multiple of 8 bytes (maintain alignment)
        if (m_currentBlock == 0 || m_currentBlockSize < m_currentIndex + bytes) {
            ++m_blockIndex;
            m_currentBlockSize = defaultBlockSize << m_blockIndex;

            m_storage = reinterpret_cast<char**>(qRealloc(m_storage, sizeof(char*) * (1 + m_blockIndex)));
            m_currentBlock = m_storage[m_blockIndex] = reinterpret_cast<char*>(qMalloc(m_currentBlockSize));
            ::memset(m_currentBlock, 0, m_currentBlockSize);

            m_currentIndex = (8 - quintptr(m_currentBlock)) & 7; // ensure first chunk is 64-bit aligned
            Q_ASSERT(m_currentIndex + bytes <= m_currentBlockSize);
        }

        char *p = reinterpret_cast<char *>
            (m_currentBlock + m_currentIndex);

        m_currentIndex += bytes;

        return p;
    }

bytesAllocated()

int QDeclarativeJS::MemoryPool::bytesAllocated ( ) const

inline

Definition at line 110 of file qdeclarativejsmemorypool_p.h.

                               {
        int bytes = 0;
        for (int index = 0; index < m_blockIndex; ++index)
            bytes += (defaultBlockSize << index);
        bytes += m_currentIndex;
        return bytes;
    }

Properties

m_blockIndex

int QDeclarativeJS::MemoryPool::m_blockIndex

private

Definition at line 119 of file qdeclarativejsmemorypool_p.h.

m_currentBlock

char* QDeclarativeJS::MemoryPool::m_currentBlock

private

Definition at line 121 of file qdeclarativejsmemorypool_p.h.

m_currentBlockSize

int QDeclarativeJS::MemoryPool::m_currentBlockSize

private

Definition at line 122 of file qdeclarativejsmemorypool_p.h.

m_currentIndex

int QDeclarativeJS::MemoryPool::m_currentIndex

private

Definition at line 120 of file qdeclarativejsmemorypool_p.h.

m_storage

char** QDeclarativeJS::MemoryPool::m_storage

private

Definition at line 123 of file qdeclarativejsmemorypool_p.h.

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The documentation for this class was generated from the following file:

• /src/declarative/qml/parser/qdeclarativejsmemorypool_p.h