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  3. FGenericPlatformMallocCrash

FGenericPlatformMallocCrash

Simple pooled memory allocator that uses preallocated memory.

Unreal Engine C++ API Reference > Runtime > Core > GenericPlatform

Inheritance Hierarchy

References

   
Module Core
Header /Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformMallocCrash.h
Include #include "GenericPlatform/GenericPlatformMallocCrash.h"

Syntax

struct FGenericPlatformMallocCrash : public FMalloc

Remarks

Simple pooled memory allocator that uses preallocated memory. Instance of this class replaces GMalloc after a crash, so we can use dynamic memory allocation even if the app crashes due to OOM.

Variables

  Type Name Description
Protected variable uint8 * BookkeepingPool Preallocated memory pool for bookkeeping.
Protected variable uint32 BookkeepingPoolOffset Current position in the bookkeeping pool.
Protected variable uint32 BookkeepingPoolSize  
Protected variable int32 CrashedThreadId The id of the thread that crashed.
Protected variable FCriticalSection InternalLock Used to lock crash malloc to one thread.
Protected variable uint8 * LargeMemoryPool Preallocated memory pool for large allocations.
Protected variable uint32 LargeMemoryPoolOffset Current position in the large memory pool.
Protected variable FMalloc * PreviousMalloc Previously used malloc.
Protected variable uint8 * SmallMemoryPool Preallocated memory pool for small allocations.
Protected variable uint32 SmallMemoryPoolOffset Current position in the small memory pool.
Protected variable uint32 SmallMemoryPoolSize  

Constructors

  Type Name Description
Public function    

Destructors

  Type Name Description
Public function Virtual    

Functions

  Type Name Description
Protected function uint8 *

AllocateFromBookkeeping ( uint32 AllocationSize
)

  
Protected function uint8 *

AllocateFromSmallPool ( uint32 AllocationSize
)

  
Protected function Const uint32  
Protected function Const uint32  
Protected function Const FMallocCrashPool *

ChoosePoolForSize ( uint32 AllocationSize
)

 Choose a pool to make a new allocation from of the given size - may use a larger pool than necessary if small pools are exhausted.
Protected function Const FMallocCrashPool *

FindPoolForAlloc ( void* Ptr
)

 Find the pool that an allocation was made from if any.
Public function Static FGenericPlatformMallocCrash &

Get ( FMalloc* MainMalloc
)

 Creates a new instance.
Protected function uint64

GetAllocationSize ( void* Original
)

  
Protected function Const const FPoolDesc &

GetPoolDesc ( uint32 Index
)

 Generated by the FGenericPlatformMallocCrash::PrintPoolsUsage.
Protected function void  
Protected function Const bool Whether it is safe to call crash malloc's methods.
Protected function Const bool

IsPtrInLargePool ( void* Ptr
)

  
Protected function Const bool

IsPtrInSmallPool ( void* Ptr
)

  
Public function void  
Protected function Static uint32  
Public function void Sets as GMalloc.

Overridden from FMalloc

  Type Name Description
Public function Virtual void

Free ( void* Original
)

 Free
Public function Virtual bool

GetAllocationSize ( void* Original,
SIZE_T& SizeOut
)

 If possible determine the size of the memory allocated at the given address
Public function Virtual const TCHAR * Gets descriptive name for logging purposes.
Public function Virtual Const bool Returns if the allocator is guaranteed to be thread-safe and therefore doesn't need a unnecessary thread-safety wrapper around it.
Public function Virtual void *

Malloc ( SIZE_T Count,
uint32 Alignment
)

 Malloc
Public function Virtual void *

Realloc ( void* Original,
SIZE_T Count,
uint32 Alignment
)

 Realloc
Public function Virtual bool Validates the allocator's heap

Constants

Name Description
LARGE_MEMORYPOOL_SIZE  
MAX_NUM_ALLOCS_IN_POOL  
MEM_TAG  
MEM_WIPETAG  
NUM_POOLS  
REQUIRED_ALIGNMENT  

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