Provides protected heap services. More...

Files
file	protectedheap.h
	Protected Heap Handler API.

Functions
static __inline__ uintptr_t	_Protected_heap_Initialize (Heap_Control heap, void area_begin, uintptr_t area_size, uintptr_t page_size)
	Initializes the protected heap. More...

bool	_Protected_heap_Extend (Heap_Control heap, void area_begin, uintptr_t area_size)
	Extends the protected heap. More...

void *	_Protected_heap_Allocate_aligned_with_boundary (Heap_Control *heap, uintptr_t size, uintptr_t alignment, uintptr_t boundary)
	Allocates an aligned memory area with boundary constraint for the protected heap. More...

static __inline__ void *	_Protected_heap_Allocate_aligned (Heap_Control *heap, uintptr_t size, uintptr_t alignment)
	Allocates an aligned memory area. More...

static __inline__ void *	_Protected_heap_Allocate (Heap_Control *heap, uintptr_t size)
	Allocates a memory area. More...

bool	_Protected_heap_Get_block_size (Heap_Control heap, void addr, uintptr_t *size)
	Returns the size of the allocatable memory area. More...

bool	_Protected_heap_Resize_block (Heap_Control heap, void addr, uintptr_t size)
	Resizes the block of the allocated memory area. More...

bool	_Protected_heap_Free (Heap_Control heap, void addr)
	Frees the allocated memory area. More...

bool	_Protected_heap_Walk (Heap_Control *heap, int source, bool dump)
	Verifies the integrity of the heap. More...

void	_Protected_heap_Iterate (Heap_Control heap, Heap_Block_visitor visitor, void visitor_arg)
	Iterates over all blocks of the heap. More...

bool	_Protected_heap_Get_information (Heap_Control heap, Heap_Information_block info)
	Returns information about used and free blocks for the heap. More...

bool	_Protected_heap_Get_free_information (Heap_Control heap, Heap_Information info)
	Returns information about free blocks for the heap. More...

uintptr_t	_Protected_heap_Get_size (Heap_Control *heap)
	Returns the size of the allocatable area in bytes. More...

Detailed Description

Provides protected heap services.

The ScoreAllocatorMutex is used to protect the heap accesses.

Function Documentation

◆ _Protected_heap_Allocate()

static __inline__ void* _Protected_heap_Allocate	(	Heap_Control *	heap,
		uintptr_t	size
	)

static

Allocates a memory area.

A size value of zero will return a unique address which may be freed with _Heap_Free(). This method first locks the allocator and after the allocation of the memory area, unlocks it again.

Parameters

[in,out]	heap	The heap to allocate a memory are from.
	size	The size of the desired memory are in bytes.

Return values

pointer	The starting address of the allocated memory area.
NULL	No memory is available of the parameters are inconsistent.

Definition at line 137 of file protectedheap.h.

◆ _Protected_heap_Allocate_aligned()

static __inline__ void* _Protected_heap_Allocate_aligned	(	Heap_Control *	heap,
		uintptr_t	size,
		uintptr_t	alignment
	)

static

Allocates an aligned memory area.

A size value of zero will return a unique address which may be freed with _Heap_Free(). This method first locks the allocator and after the allocation of the memory area, unlocks it again.

Parameters

[in,out]	heap	The heap to allocate a memory are from.
	size	The size of the desired memory are in bytes.
	alignment	The allocated memory area will begin at an address aligned by this value.

Return values

pointer	The starting address of the allocated memory area.
NULL	No memory is available of the parameters are inconsistent.

Definition at line 114 of file protectedheap.h.

◆ _Protected_heap_Allocate_aligned_with_boundary()

void* _Protected_heap_Allocate_aligned_with_boundary	(	Heap_Control *	heap,
		uintptr_t	size,
		uintptr_t	alignment,
		uintptr_t	boundary
	)

Allocates an aligned memory area with boundary constraint for the protected heap.

A size value of zero will return a unique address which may be freed with _Heap_Free(). This method first locks the allocator and after the allocation of the memory area, unlocks it again.

Parameters

[in,out]	heap	The heap to allocate a memory are from.
	size	The size of the desired memory are in bytes.
	alignment	The allocated memory area will begin at an address aligned by this value.
	boundary	The allocated memory area will fulfill a boundary constraint, if this value is not equal to zero. The boundary value specifies the set of addresses which are aligned by the boundary value. The interior of the allocated memory area will not contain an element of this set. The begin or end address of the area may be a member of the set.

Return values

pointer	The starting address of the allocated memory area.
NULL	No memory is available of the parameters are inconsistent.

◆ _Protected_heap_Extend()

bool _Protected_heap_Extend	(	Heap_Control *	heap,
		void *	area_begin,
		uintptr_t	area_size
	)

Extends the protected heap.

Parameters

[in,out]	heap	The heap to extend.
	area_begin	The starting addres of the area to extend heap with.
	area_size	The size of the heap area.

Return values

true	The operation succeeded.
false	The operation failed.

◆ _Protected_heap_Free()

bool _Protected_heap_Free	(	Heap_Control *	heap,
		void *	addr
	)

Frees the allocated memory area.

Inappropriate values for addr may corrupt the heap. This method first locks the allocator and after the free operation, unlocks it again.

Parameters

[in,out]	heap	The heap of the allocated memory area.
	addr	The starting address of the memory area to be freed.

Return values

true	The allocated memory area was successfully freed.
false	The method failed.

◆ _Protected_heap_Get_block_size()

bool _Protected_heap_Get_block_size	(	Heap_Control *	heap,
		void *	addr,
		uintptr_t *	size
	)

Returns the size of the allocatable memory area.

The size value may be greater than the initially requested size in _Heap_Allocate_aligned_with_boundary().

Inappropriate values for addr will not corrupt the heap, but may yield invalid size values.

This method first locks the allocator and after the operation, unlocks it again.

Parameters

	heap	The heap to operate upon.
	addr	The starting address of the allocatable memory area.
[out]	size	Stores the size of the allocatable memory area after the method call.

Return values

true	The operation was successful.
false	The operation was not successful.

◆ _Protected_heap_Get_free_information()

bool _Protected_heap_Get_free_information	(	Heap_Control *	heap,
		Heap_Information *	info
	)

Returns information about free blocks for the heap.

This method first locks the allocator and after the operation, unlocks it again.

Parameters

	heap	The heap to get the information from.
[out]	info	Stores the information about free blocks of heap after the method call.

◆ _Protected_heap_Get_information()

bool _Protected_heap_Get_information	(	Heap_Control *	heap,
		Heap_Information_block *	info
	)

Returns information about used and free blocks for the heap.

This method first locks the allocator and after the operation, unlocks it again.

Parameters

	heap	The heap to get the information from.
[out]	info	Stores the information of the heap after the method call.

◆ _Protected_heap_Get_size()

uintptr_t _Protected_heap_Get_size ( Heap_Control * heap )

Returns the size of the allocatable area in bytes.

This value is an integral multiple of the page size.

Parameters

heap	The heap to get the allocatable area from.

Returns: The size of the allocatable area in heap in bytes.

◆ _Protected_heap_Initialize()

static __inline__ uintptr_t _Protected_heap_Initialize	(	Heap_Control *	heap,
		void *	area_begin,
		uintptr_t	area_size,
		uintptr_t	page_size
	)

static

Initializes the protected heap.

Parameters

[out]	heap	The heap to initialize.
	area_begin	The starting address of the heap area.
	area_size	The size of the heap area.
	page_size	The page size for the heap.

Definition at line 48 of file protectedheap.h.

◆ _Protected_heap_Iterate()

void _Protected_heap_Iterate	(	Heap_Control *	heap,
		Heap_Block_visitor	visitor,
		void *	visitor_arg
	)

Iterates over all blocks of the heap.

This method first locks the allocator and after the operation, unlocks it again.

Parameters

[in,out]	heap	The heap to iterate over.
	visitor	This will be called for each heap block with the argument visitor_arg.
[in,out]	visitor_arg	The argument for all calls of visitor.

◆ _Protected_heap_Resize_block()

bool _Protected_heap_Resize_block	(	Heap_Control *	heap,
		void *	addr,
		uintptr_t	size
	)

Resizes the block of the allocated memory area.

Inappropriate values for addr may corrupt the heap.

This method first locks the allocator and after the resize, unlocks it again.

Parameters

[in,out]	heap	The heap to operate upon.
	addr	The starting address of the allocated memory area to be resized.
	size	The least possible size for the new memory area. Resize may be impossible and depends on the current heap usage.
[out]	old_size	Stores the size available for allocation in the current block before the resize after the method call.
[out]	new_size	Stores the size available for allocation in the resized block after the method call. In the case of an unsuccessful resize, zero is returned in this parameter

Return values

HEAP_RESIZE_SUCCESSFUL	The resize was successful.
HEAP_RESIZE_UNSATISFIED	The least possible size size was too big. Resize not possible.
HEAP_RESIZE_FATAL_ERROR	The block starting at addr is not part of the heap.

◆ _Protected_heap_Walk()

bool _Protected_heap_Walk	(	Heap_Control *	heap,
		int	source,
		bool	dump
	)

Verifies the integrity of the heap.

Walks the heap to verify its integrity. This method first locks the allocator and after the operation, unlocks it again, if the thread dispatch is enabled.

Parameters

heap	The heap whose integrity is to be verified.
source	If dump is `true`, this is used to mark the output lines.
dump	Indicates whether diagnostic messages will be printed to standard output.

Return values

true	No errors occured, the heap´s integrity is not violated.
false	The heap is corrupt.

Files

Functions

Detailed Description

Function Documentation

◆ _Protected_heap_Allocate()

◆ _Protected_heap_Allocate_aligned()

◆ _Protected_heap_Allocate_aligned_with_boundary()

◆ _Protected_heap_Extend()

◆ _Protected_heap_Free()

◆ _Protected_heap_Get_block_size()

◆ _Protected_heap_Get_free_information()

◆ _Protected_heap_Get_information()

◆ _Protected_heap_Get_size()

◆ _Protected_heap_Initialize()

◆ _Protected_heap_Iterate()

◆ _Protected_heap_Resize_block()

◆ _Protected_heap_Walk()