#include <MemoryMappedFile.h>

Inheritance diagram for AnonymousMemoryMap:

Collaboration diagram for AnonymousMemoryMap:

Public Member Functions
	AnonymousMemoryMap (uintptr_t address, size_t length, Permissions perms)

virtual MemoryMappedObject *	clone ()

virtual MemoryMappedObject *	split (uintptr_t at)

virtual bool	remove (size_t length)

virtual void	setPermissions (MemoryMappedObject::Permissions perms)

virtual void	unmap ()

virtual bool	trap (uintptr_t address, bool bWrite)

Public Member Functions inherited from MemoryMappedObject
	MemoryMappedObject (uintptr_t address, bool bCopyOnWrite, size_t length, Permissions perms)

virtual void	sync (uintptr_t at, bool async)

virtual void	invalidate (uintptr_t at)

virtual bool	compact ()

bool	matches (uintptr_t address)

uintptr_t	address () const

size_t	length () const

Private Member Functions
void	unmapUnlocked ()

Private Attributes
List< void * >	m_Mappings

Spinlock	m_Lock

Static Private Attributes
static physical_uintptr_t	m_Zero = 0

Additional Inherited Members
Public Types inherited from MemoryMappedObject
typedef int	Permissions

Static Public Attributes inherited from MemoryMappedObject
static const int	None = 0x0

static const int	Read = 0x1

static const int	Write = 0x2

static const int	Exec = 0x4

Protected Attributes inherited from MemoryMappedObject
bool	m_bCopyOnWrite

uintptr_t	m_Address

size_t	m_Length

Permissions	m_Permissions

Detailed Description

Anonymous memory map object.

Anonymous memory maps do not map back to an actual file; they back onto a common page full of zeroes with forced copy-on-write. This is perfect for mapping in large .bss sections in binaries or for getting huge amounts of zeroed memory.

Definition at line 284 of file MemoryMappedFile.h.

Member Function Documentation

MemoryMappedObject * AnonymousMemoryMap::clone ( )

virtual

Clones the existing metadata of this object into another.

Returns a MemoryMappedObject that exactly matches this one, but which can be used for reference in a new address space. Used for address space clones.

Note that mappings are automatically cloned - only clone metadata in this method.

Implements MemoryMappedObject.

Definition at line 72 of file MemoryMappedFile.cc.

References m_Mappings.

bool AnonymousMemoryMap::remove ( size_t length )

virtual

Removes pages from the start of this MemoryMappedObject.

To remove pages from the middle or end of a MemoryMappedObject, use split() and then remove()/unmap() on the returned object).