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> Unreal Engine API Reference > Runtime > Core > HAL > FMallocDoubleFreeFinder

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FMallocDoubleFreeFinder

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Inheritance Hierarchy

FUseSystemMallocForNew

FExec

FMalloc

FMallocDoubleFreeFinder

References

Module	Core
Header	/Engine/Source/Runtime/Core/Public/HAL/MallocDoubleFreeFinder.h
Include	#include "HAL/MallocDoubleFreeFinder.h"

Syntax

class FMallocDoubleFreeFinder : public FMalloc

Variables

		Name	Description
	TArray< FCallSt...	CallStackInfoArray
	TMap< FCallStac...	CallStackMapKeyToCallStackIndexMap
	FCriticalSectio...	CriticalSection
	uint32	DisabledTLS
	FRWLock	RWLock
	TMap< const voi...	TrackedCurrentAllocations
	TMap< const voi...	TrackedFreeAllocations

Constructors

	Name	Description
	FMallocDoubleFreeFinder ( FMalloc* InMalloc )

Functions

	Name	Description
void	DecDisabled()
void	DumpStackTraceToLog ( int32 StackIndex )
int32	GetCallStackIndex()
void	IncDisabled()
void	Init()
bool	IsDisabled()
FMalloc *...	OverrideIfEnabled ( FMalloc* InUsedAlloc )
void	TrackFree ( void* Ptr, uint32 OldSize, int32 CallStackIndex )
void	TrackMalloc ( void* Ptr, uint32 Size, int32 CallStackIndex )
void	TrackRealloc ( void* OldPtr, void* NewPtr, uint32 NewSize, uint32 OldSize, int32 CallStackIndex )
void	TrackSpecial ( void* Ptr )	If you get an allocation/memory error outside of the allocator you can call this directly It will dump a callstack of the last allocator free most likely to have caused the problem to the log, if you have symbols loaded Might be useful to pass an access violation ptr to this!

Overridden from FMalloc

	Name	Description
void	ClearAndDisableTLSCachesOnCurrentThread()	Clears the TLS caches on the current thread and disables any future caching.
void	DumpAllocatorStats ( FOutputDevice& Ar )	Dumps current allocator stats to the log.
void	Free ( void* Original )	Free
bool	GetAllocationSize ( void* Original, SIZE_T& SizeOut )	If possible determine the size of the memory allocated at the given address
void	GetAllocatorStats ( FGenericMemoryStats& out_Stats )	Writes allocator stats from the last update into the specified destination.
const TCHAR ...	GetDescriptiveName()	Gets descriptive name for logging purposes.
void	InitializeStatsMetadata()	Initializes stats metadata.
bool	IsInternallyThreadSafe()	Returns if the allocator is guaranteed to be thread-safe and therefore doesn't need a unnecessary thread-safety wrapper around it.
void *	Malloc ( SIZE_T Count, uint32 Alignment )	Malloc
SIZE_T	QuantizeSize ( SIZE_T Count, uint32 Alignment )	For some allocators this will return the actual size that should be requested to eliminate internal fragmentation.
void *	Realloc ( void* Original, SIZE_T Count, uint32 Alignment )	Realloc
void	SetupTLSCachesOnCurrentThread()	Set up TLS caches on the current thread. These are the threads that we can trim.
void	Trim ( bool bTrimThreadCaches )	Releases as much memory as possible. Must be called from the main thread.
void	UpdateStats()	Called once per frame, gathers and sets all memory allocator statistics into the corresponding stats.
bool	ValidateHeap()	Validates the allocator's heap

Overridden from FExec

		Name	Description
	bool	Exec ( UWorld* InWorld, const TCHAR* Cmd, FOutputDevice& Ar )	Handles any commands passed in on the command line

Classes

	Name	Description
	FCallStackInfoDoublleFreeFinder
	FCallStackMapKey	Used as a key in our current allocations/freed allocations maps
	TrackedAllocationData

Constants

Name	Description
MallocDoubleFreeFinderCallStackEntriesToSkipCount
MallocDoubleFreeFinderMaxCallStackDepth

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