Storage manager.

The storage manager works best in conjunction with the custom ROOT new and delete operators defined in the file NewDelete.cxx (libNew.so). Only when using the custom allocation operators will memory usage statistics be gathered using the TStorage EnterStat(), RemoveStat(), etc. functions. Memory checking is by default enabled (when using libNew.so) and usage statistics is gathered. Using the resource (in .rootrc): Root.MemStat one can toggle statistics gathering on or off. More specifically on can trap the allocation of a block of memory of a certain size. This can be specified using the resource: Root.MemStat.size, using the resource Root.MemStat.cnt one can specify after how many allocations of this size the trap should occur.

Set the compile option R__NOSTATS to de-activate all memory checking and statistics gathering in the system.

Definition at line 33 of file TStorage.h.

Public Member Functions
virtual	~TStorage ()

Static Public Member Functions
static void	AddToHeap (ULong_t begin, ULong_t end)
	add a range to the heap More...

static void *	Alloc (size_t size)
	Allocate a block of memory, that later can be resized using TStorage::ReAlloc(). More...

static void	Dealloc (void *ptr)
	De-allocate block of memory, that was allocated via TStorage::Alloc(). More...

static void	EnableStatistics (int size=-1, int ix=-1)
	Enable memory usage statistics gathering. More...

static void	EnterStat (size_t size, void *p)
	Register a memory allocation operation. More...

static Bool_t	FilledByObjectAlloc (volatile UInt_t *member)

static FreeHookFun_t	GetFreeHook ()

static void *	GetFreeHookData ()
	return static free hook data More...

static ULong_t	GetHeapBegin ()

static ULong_t	GetHeapEnd ()

static size_t	GetMaxBlockSize ()

static Bool_t	HasCustomNewDelete ()
	return the has custom delete flag More...

static Bool_t	IsOnHeap (void *p)
	is object at p in the heap? More...

static void *	ObjectAlloc (size_t size)
	Used to allocate a TObject on the heap (via TObject::operator new()). More...

static void *	ObjectAlloc (size_t size, void *vp)
	Used to allocate a TObject on the heap (via TObject::operator new(size_t,void*)) in position vp. More...

static void *	ObjectAllocArray (size_t size)
	Used to allocate array of TObject on the heap (via TObject::operator new[]()). More...

static void	ObjectDealloc (void *vp)
	Used to deallocate a TObject on the heap (via TObject::operator delete()). More...

static void	ObjectDealloc (void vp, void ptr)
	Used to deallocate a TObject on the heap (via TObject::operator delete(void,void)). More...

static void	PrintStatistics ()
	Print memory usage statistics. More...

static void *	ReAlloc (void *vp, size_t size)
	Reallocate (i.e. More...

static void *	ReAlloc (void *vp, size_t size, size_t oldsize)
	Reallocate (i.e. More...

static char *	ReAllocChar (char *vp, size_t size, size_t oldsize)
	Reallocate (i.e. More...

static Int_t *	ReAllocInt (Int_t *vp, size_t size, size_t oldsize)
	Reallocate (i.e. More...

static void	RemoveStat (void *p)
	Register a memory free operation. More...

static void	SetCustomNewDelete ()
	set the has custom delete flag More...

static void	SetFreeHook (FreeHookFun_t func, void *data)
	Set a free handler. More...

static void	SetMaxBlockSize (size_t size)

static void	SetReAllocHooks (ReAllocFun_t func1, ReAllocCFun_t func2)
	Set a custom ReAlloc handlers. More...

Static Private Attributes
static FreeHookFun_t	fgFreeHook

static void *	fgFreeHookData

static Bool_t	fgHasCustomNewDelete

static size_t	fgMaxBlockSize

static ReAllocCFun_t	fgReAllocCHook

static ReAllocFun_t	fgReAllocHook

static const UInt_t	kObjectAllocMemValue = 0x99999999

#include <TStorage.h>

Constructor & Destructor Documentation

◆ ~TStorage()

virtual TStorage::~TStorage ( )

inlinevirtual

Definition at line 46 of file TStorage.h.

Member Function Documentation

◆ AddToHeap()

void TStorage::AddToHeap	(	ULong_t	begin,
		ULong_t	end
	)

static

add a range to the heap

Definition at line 507 of file TStorage.cxx.

◆ Alloc()

void * TStorage::Alloc ( size_t size )

static

Allocate a block of memory, that later can be resized using TStorage::ReAlloc().

Definition at line 152 of file TStorage.cxx.

◆ Dealloc()

void TStorage::Dealloc ( void * ptr )

static

De-allocate block of memory, that was allocated via TStorage::Alloc().

Definition at line 170 of file TStorage.cxx.

◆ EnableStatistics()

void TStorage::EnableStatistics	(	int	size = `-1`,
		int	ix = `-1`
	)

static

Enable memory usage statistics gathering.

Size is the size of the memory block that should be trapped and ix is after how many such allocations the trap should happen.

Definition at line 450 of file TStorage.cxx.

◆ EnterStat()

void TStorage::EnterStat	(	size_t	size,
		void *	p
	)

static

Register a memory allocation operation.

If desired one can trap an allocation of a certain size in case one tries to find a memory leak of that particular size. This function is only called via the ROOT custom new operators.

Definition at line 99 of file TStorage.cxx.

◆ FilledByObjectAlloc()

Bool_t TStorage::FilledByObjectAlloc ( volatile UInt_t * member )

inlinestatic

Definition at line 88 of file TStorage.h.

◆ GetFreeHook()

FreeHookFun_t TStorage::GetFreeHook ( )

inlinestatic

Definition at line 120 of file TStorage.h.

◆ GetFreeHookData()

void * TStorage::GetFreeHookData ( )

static

return static free hook data

Definition at line 482 of file TStorage.cxx.

◆ GetHeapBegin()

ULong_t TStorage::GetHeapBegin ( )

static

Definition at line 463 of file TStorage.cxx.

◆ GetHeapEnd()

ULong_t TStorage::GetHeapEnd ( )

static

Definition at line 472 of file TStorage.cxx.

◆ GetMaxBlockSize()

size_t TStorage::GetMaxBlockSize ( )

inlinestatic

Definition at line 116 of file TStorage.h.

◆ HasCustomNewDelete()

Bool_t TStorage::HasCustomNewDelete ( )

static

return the has custom delete flag

Definition at line 490 of file TStorage.cxx.

◆ IsOnHeap()

Bool_t TStorage::IsOnHeap ( void * p )

static

is object at p in the heap?

Definition at line 515 of file TStorage.cxx.

◆ ObjectAlloc() [1/2]

void * TStorage::ObjectAlloc ( size_t sz )

static

Used to allocate a TObject on the heap (via TObject::operator new()).

Directly after this routine one can call (in the TObject ctor) TStorage::FilledByObjectAlloc() to find out if the just created object is on the heap. This technique is necessary as there is one stack per thread and we can not rely on comparison with the current stack memory position.

Definition at line 328 of file TStorage.cxx.

◆ ObjectAlloc() [2/2]

void * TStorage::ObjectAlloc	(	size_t	size,
		void *	vp
	)

static

Used to allocate a TObject on the heap (via TObject::operator new(size_t,void*)) in position vp.

vp is already allocated (maybe on heap, maybe on stack) so just return.

Definition at line 351 of file TStorage.cxx.

◆ ObjectAllocArray()

void * TStorage::ObjectAllocArray ( size_t sz )

static

Used to allocate array of TObject on the heap (via TObject::operator new[]()).

Unlike the 'singular' ObjectAlloc, we do not mark those object has being allocated on the heap as they can not be individually deleted.

Definition at line 340 of file TStorage.cxx.

◆ ObjectDealloc() [1/2]

void TStorage::ObjectDealloc ( void * vp )

static

Used to deallocate a TObject on the heap (via TObject::operator delete()).

Definition at line 359 of file TStorage.cxx.

◆ ObjectDealloc() [2/2]

void TStorage::ObjectDealloc	(	void *	vp,
		void *	ptr
	)

static

Used to deallocate a TObject on the heap (via TObject::operator delete(void*,void*)).

Definition at line 368 of file TStorage.cxx.

◆ PrintStatistics()

void TStorage::PrintStatistics ( )

static

Print memory usage statistics.

Definition at line 406 of file TStorage.cxx.

◆ ReAlloc() [1/2]

void * TStorage::ReAlloc	(	void *	ovp,
		size_t	size
	)

static

Reallocate (i.e.

resize) block of memory. Don't use if size is larger than old size, use ReAlloc(void *, size_t, size_t) instead.

Definition at line 183 of file TStorage.cxx.

◆ ReAlloc() [2/2]

void * TStorage::ReAlloc	(	void *	ovp,
		size_t	size,
		size_t	oldsize
	)

static

Reallocate (i.e.

resize) block of memory. Checks if current size is equal to oldsize. If not memory was overwritten.

Definition at line 222 of file TStorage.cxx.

◆ ReAllocChar()

char * TStorage::ReAllocChar	(	char *	ovp,
		size_t	size,
		size_t	oldsize
	)

static

Reallocate (i.e.

resize) array of chars. Size and oldsize are in number of chars.

Definition at line 265 of file TStorage.cxx.

◆ ReAllocInt()

Int_t * TStorage::ReAllocInt	(	Int_t *	ovp,
		size_t	size,
		size_t	oldsize
	)

static

Reallocate (i.e.

resize) array of integers. Size and oldsize are number of integers (not number of bytes).

Definition at line 295 of file TStorage.cxx.

◆ RemoveStat()

void TStorage::RemoveStat ( void * vp )

static

Register a memory free operation.

This function is only called via the custom ROOT delete operator.

Definition at line 129 of file TStorage.cxx.

◆ SetCustomNewDelete()

void TStorage::SetCustomNewDelete ( )

static

set the has custom delete flag

Definition at line 498 of file TStorage.cxx.

◆ SetFreeHook()

void TStorage::SetFreeHook	(	FreeHookFun_t	func,
		void *	data
	)

static

Set a free handler.

Definition at line 387 of file TStorage.cxx.

◆ SetMaxBlockSize()

void TStorage::SetMaxBlockSize ( size_t size )

inlinestatic

Definition at line 118 of file TStorage.h.

◆ SetReAllocHooks()

void TStorage::SetReAllocHooks	(	ReAllocFun_t	rh1,
		ReAllocCFun_t	rh2
	)

static

Set a custom ReAlloc handlers.

This function is typically called via a static object in the ROOT libNew.so shared library.

Definition at line 397 of file TStorage.cxx.

Member Data Documentation

◆ fgFreeHook

FreeHookFun_t TStorage::fgFreeHook

staticprivate

Definition at line 37 of file TStorage.h.

◆ fgFreeHookData

void * TStorage::fgFreeHookData

staticprivate

Definition at line 38 of file TStorage.h.

◆ fgHasCustomNewDelete

Bool_t TStorage::fgHasCustomNewDelete

staticprivate

Definition at line 41 of file TStorage.h.

◆ fgMaxBlockSize

size_t TStorage::fgMaxBlockSize

staticprivate

Definition at line 36 of file TStorage.h.

◆ fgReAllocCHook

ReAllocCFun_t TStorage::fgReAllocCHook

staticprivate

Definition at line 40 of file TStorage.h.

◆ fgReAllocHook

ReAllocFun_t TStorage::fgReAllocHook

staticprivate

Definition at line 39 of file TStorage.h.

◆ kObjectAllocMemValue

const UInt_t TStorage::kObjectAllocMemValue = 0x99999999

staticprivate

Definition at line 42 of file TStorage.h.

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

core/base/inc/TStorage.h
core/base/src/TStorage.cxx

Public Member Functions

Static Public Member Functions

Static Private Attributes

Constructor & Destructor Documentation

◆ ~TStorage()

Member Function Documentation

◆ AddToHeap()

◆ Alloc()

◆ Dealloc()

◆ EnableStatistics()

◆ EnterStat()

◆ FilledByObjectAlloc()

◆ GetFreeHook()

◆ GetFreeHookData()

◆ GetHeapBegin()

◆ GetHeapEnd()

◆ GetMaxBlockSize()

◆ HasCustomNewDelete()

◆ IsOnHeap()

◆ ObjectAlloc() [1/2]

◆ ObjectAlloc() [2/2]

◆ ObjectAllocArray()

◆ ObjectDealloc() [1/2]

◆ ObjectDealloc() [2/2]

◆ PrintStatistics()

◆ ReAlloc() [1/2]

◆ ReAlloc() [2/2]

◆ ReAllocChar()

◆ ReAllocInt()

◆ RemoveStat()

◆ SetCustomNewDelete()

◆ SetFreeHook()

◆ SetMaxBlockSize()

◆ SetReAllocHooks()

Member Data Documentation

◆ fgFreeHook

◆ fgFreeHookData

◆ fgHasCustomNewDelete

◆ fgMaxBlockSize

◆ fgReAllocCHook

◆ fgReAllocHook

◆ kObjectAllocMemValue