static void test_check_free_block(void)
{
Heap_Block *block = NULL;
Heap_Block *next_block = NULL;
Heap_Block *first_free_block = NULL;
Heap_Block *secound_free_block = NULL;
void *p1 = NULL;
puts( "test the _Heap_Walk_check_free_block() function" );
puts( "\tset a previous size for the next block which is not equal to the size of the actual block" );
test_heap_init_default();
block = _Heap_Free_list_first( &TestHeap );
next_block = _Heap_Block_at( block, _Heap_Block_size( block ) );
next_block->prev_size = _Heap_Block_size( block ) - 1;
test_call_heap_walk( false );
puts( "\tclear the previous_used flag of the first free block after an used block" );
test_heap_init_default();
p1 = test_allocate_block();
block = _Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size );
first_free_block = _Heap_Free_list_first( &TestHeap );
first_free_block->size_and_flag &= ~HEAP_PREV_BLOCK_USED;
first_free_block->prev_size = _Heap_Block_size( block );
_Heap_Free_list_insert_after( first_free_block, block );
test_call_heap_walk( false );
puts( "\ttake a free block out of the free list" );
test_heap_init_custom();
test_create_heap_with_gaps();
first_free_block = _Heap_Free_list_first( &TestHeap );
secound_free_block = first_free_block->next;
_Heap_Free_list_remove( secound_free_block );
test_call_heap_walk( false );
}
static Heap_Resize_status _Heap_Resize_block_checked(
Heap_Control *heap,
Heap_Block *block,
uintptr_t alloc_begin,
uintptr_t new_alloc_size,
uintptr_t *old_size,
uintptr_t *new_size
)
{
Heap_Statistics *const stats = &heap->stats;
uintptr_t const block_begin = (uintptr_t) block;
uintptr_t block_size = _Heap_Block_size( block );
uintptr_t block_end = block_begin + block_size;
uintptr_t alloc_size = block_end - alloc_begin + HEAP_ALLOC_BONUS;
Heap_Block *next_block = _Heap_Block_at( block, block_size );
uintptr_t next_block_size = _Heap_Block_size( next_block );
bool next_block_is_free = _Heap_Is_free( next_block );
_HAssert( _Heap_Is_block_in_heap( heap, next_block ) );
_HAssert( _Heap_Is_prev_used( next_block ) );
*old_size = alloc_size;
if ( next_block_is_free ) {
block_size += next_block_size;
alloc_size += next_block_size;
}
if ( new_alloc_size > alloc_size ) {
return HEAP_RESIZE_UNSATISFIED;
}
if ( next_block_is_free ) {
_Heap_Block_set_size( block, block_size );
_Heap_Free_list_remove( next_block );
next_block = _Heap_Block_at( block, block_size );
next_block->size_and_flag |= HEAP_PREV_BLOCK_USED;
/* Statistics */
--stats->free_blocks;
stats->free_size -= next_block_size;
}
block = _Heap_Block_allocate( heap, block, alloc_begin, new_alloc_size );
block_size = _Heap_Block_size( block );
next_block = _Heap_Block_at( block, block_size );
*new_size = (uintptr_t) next_block - alloc_begin + HEAP_ALLOC_BONUS;
/* Statistics */
++stats->resizes;
return HEAP_RESIZE_SUCCESSFUL;
}
static Heap_Block *_Heap_Block_allocate_from_end(
Heap_Control *heap,
Heap_Block *block,
Heap_Block *free_list_anchor,
uintptr_t alloc_begin,
uintptr_t alloc_size
)
{
Heap_Statistics *const stats = &heap->stats;
uintptr_t block_begin = (uintptr_t) block;
uintptr_t block_size = _Heap_Block_size( block );
uintptr_t block_end = block_begin + block_size;
Heap_Block *const new_block =
_Heap_Block_of_alloc_area( alloc_begin, heap->page_size );
uintptr_t const new_block_begin = (uintptr_t) new_block;
uintptr_t const new_block_size = block_end - new_block_begin;
block_end = new_block_begin;
block_size = block_end - block_begin;
_HAssert( block_size >= heap->min_block_size );
_HAssert( new_block_size >= heap->min_block_size );
/* Statistics */
stats->free_size += block_size;
if ( _Heap_Is_prev_used( block ) ) {
_Heap_Free_list_insert_after( free_list_anchor, block );
free_list_anchor = block;
/* Statistics */
++stats->free_blocks;
} else {
Heap_Block *const prev_block = _Heap_Prev_block( block );
uintptr_t const prev_block_size = _Heap_Block_size( prev_block );
block = prev_block;
block_begin = (uintptr_t) block;
block_size += prev_block_size;
}
block->size_and_flag = block_size | HEAP_PREV_BLOCK_USED;
new_block->prev_size = block_size;
new_block->size_and_flag = new_block_size;
_Heap_Block_split( heap, new_block, free_list_anchor, alloc_size );
return new_block;
}
static void
check_result(
Heap_Control* the_heap,
Heap_Block* the_block,
_H_uptr_t user_addr,
_H_uptr_t aligned_user_addr,
uint32_t size)
{
_H_uptr_t const user_area = _H_p2u(_Heap_User_area(the_block));
_H_uptr_t const block_end = _H_p2u(the_block)
+ _Heap_Block_size(the_block) + HEAP_BLOCK_HEADER_OFFSET;
_H_uptr_t const user_end = aligned_user_addr + size;
_H_uptr_t const heap_start = _H_p2u(the_heap->start) + HEAP_OVERHEAD;
_H_uptr_t const heap_end = _H_p2u(the_heap->final)
+ HEAP_BLOCK_HEADER_OFFSET;
uint32_t const page_size = the_heap->page_size;
_HAssert(user_addr == user_area);
_HAssert(aligned_user_addr - user_area < page_size);
_HAssert(aligned_user_addr >= user_area);
_HAssert(aligned_user_addr < block_end);
_HAssert(user_end > user_area);
_HAssert(user_end <= block_end);
_HAssert(aligned_user_addr >= heap_start);
_HAssert(aligned_user_addr < heap_end);
_HAssert(user_end > heap_start);
_HAssert(user_end <= heap_end);
}
static uintptr_t _Heap_Check_block(
const Heap_Control *heap,
const Heap_Block *block,
uintptr_t alloc_size,
uintptr_t alignment,
uintptr_t boundary
)
{
uintptr_t const page_size = heap->page_size;
uintptr_t const min_block_size = heap->min_block_size;
uintptr_t const block_begin = (uintptr_t) block;
uintptr_t const block_size = _Heap_Block_size( block );
uintptr_t const block_end = block_begin + block_size;
uintptr_t const alloc_begin_floor = _Heap_Alloc_area_of_block( block );
uintptr_t const alloc_begin_ceiling = block_end - min_block_size
+ HEAP_BLOCK_HEADER_SIZE + page_size - 1;
uintptr_t alloc_end = block_end + HEAP_ALLOC_BONUS;
uintptr_t alloc_begin = alloc_end - alloc_size;
alloc_begin = _Heap_Align_down( alloc_begin, alignment );
/* Ensure that the we have a valid new block at the end */
if ( alloc_begin > alloc_begin_ceiling ) {
alloc_begin = _Heap_Align_down( alloc_begin_ceiling, alignment );
}
alloc_end = alloc_begin + alloc_size;
/* Ensure boundary constaint */
if ( boundary != 0 ) {
uintptr_t const boundary_floor = alloc_begin_floor + alloc_size;
uintptr_t boundary_line = _Heap_Align_down( alloc_end, boundary );
while ( alloc_begin < boundary_line && boundary_line < alloc_end ) {
if ( boundary_line < boundary_floor ) {
return 0;
}
alloc_begin = boundary_line - alloc_size;
alloc_begin = _Heap_Align_down( alloc_begin, alignment );
alloc_end = alloc_begin + alloc_size;
boundary_line = _Heap_Align_down( alloc_end, boundary );
}
}
/* Ensure that the we have a valid new block at the beginning */
if ( alloc_begin >= alloc_begin_floor ) {
uintptr_t const alloc_block_begin =
(uintptr_t) _Heap_Block_of_alloc_area( alloc_begin, page_size );
uintptr_t const free_size = alloc_block_begin - block_begin;
if ( free_size >= min_block_size || free_size == 0 ) {
return alloc_begin;
}
}
return 0;
}
static void _Heap_Protection_delay_block_free(
Heap_Control *heap,
Heap_Block *block
)
{
uintptr_t *const pattern_begin = (uintptr_t *)
_Heap_Alloc_area_of_block( block );
uintptr_t *const pattern_end = (uintptr_t *)
((uintptr_t) block + _Heap_Block_size( block ) + HEAP_ALLOC_BONUS);
uintptr_t const delayed_free_block_count =
heap->Protection.delayed_free_block_count;
uintptr_t *current = NULL;
block->Protection_begin.next_delayed_free_block = block;
block->Protection_begin.task = _Thread_Get_executing();
if ( delayed_free_block_count > 0 ) {
Heap_Block *const last = heap->Protection.last_delayed_free_block;
last->Protection_begin.next_delayed_free_block = block;
} else {
heap->Protection.first_delayed_free_block = block;
}
heap->Protection.last_delayed_free_block = block;
heap->Protection.delayed_free_block_count = delayed_free_block_count + 1;
for ( current = pattern_begin; current != pattern_end; ++current ) {
*current = HEAP_FREE_PATTERN;
}
}
void _Heap_Get_free_information(
Heap_Control *the_heap,
Heap_Information *info
)
{
Heap_Block *the_block;
Heap_Block *const tail = _Heap_Free_list_tail(the_heap);
info->number = 0;
info->largest = 0;
info->total = 0;
for(the_block = _Heap_Free_list_first(the_heap);
the_block != tail;
the_block = the_block->next)
{
uint32_t const the_size = _Heap_Block_size(the_block);
/* As we always coalesce free blocks, prev block must have been used. */
_HAssert(_Heap_Is_prev_used(the_block));
info->number++;
info->total += the_size;
if ( info->largest < the_size )
info->largest = the_size;
}
}
bool _Heap_Size_of_alloc_area(
Heap_Control *heap,
void *alloc_begin_ptr,
uintptr_t *alloc_size
)
{
uintptr_t const page_size = heap->page_size;
uintptr_t const alloc_begin = (uintptr_t) alloc_begin_ptr;
Heap_Block *block = _Heap_Block_of_alloc_area( alloc_begin, page_size );
Heap_Block *next_block = NULL;
uintptr_t block_size = 0;
if ( !_Heap_Is_block_in_heap( heap, block ) ) {
return false;
}
block_size = _Heap_Block_size( block );
next_block = _Heap_Block_at( block, block_size );
if (
!_Heap_Is_block_in_heap( heap, next_block )
|| !_Heap_Is_prev_used( next_block )
) {
return false;
}
*alloc_size = (uintptr_t) next_block + HEAP_BLOCK_SIZE_OFFSET - alloc_begin;
return true;
}
static void test_heap_do_block_allocate( int variant, void *p2 )
{
Heap_Block *const block =
_Heap_Block_of_alloc_area( (uintptr_t) p2, test_page_size());
uintptr_t const alloc_box_begin = _Heap_Alloc_area_of_block( block );
uintptr_t const alloc_box_size = _Heap_Block_size( block );
uintptr_t const alloc_box_end = alloc_box_begin + alloc_box_size;
uintptr_t alloc_begin = 0;
uintptr_t alloc_size = 0;
puts( "\tallocate block at the beginning");
alloc_begin = alloc_box_begin;
alloc_size = 0;
test_block_alloc( variant, 0, alloc_begin, alloc_size );
puts( "\tallocate block full space");
alloc_begin = alloc_box_begin;
alloc_size = alloc_box_size + HEAP_ALLOC_BONUS
- HEAP_BLOCK_HEADER_SIZE;
test_block_alloc( variant, 1, alloc_begin, alloc_size );
puts( "\tallocate block in the middle");
alloc_begin = alloc_box_begin + TEST_DEFAULT_PAGE_SIZE;
alloc_size = 0;
test_block_alloc( variant, 2, alloc_begin, alloc_size );
puts( "\tallocate block at the end");
alloc_begin = alloc_box_end - TEST_DEFAULT_PAGE_SIZE;
alloc_size = TEST_DEFAULT_PAGE_SIZE + HEAP_ALLOC_BONUS
- HEAP_BLOCK_HEADER_SIZE;
test_block_alloc( variant, 3, alloc_begin, alloc_size );
}
Heap_Block *_Heap_Block_allocate(
Heap_Control *heap,
Heap_Block *block,
uintptr_t alloc_begin,
uintptr_t alloc_size
)
{
Heap_Statistics *const stats = &heap->stats;
uintptr_t const alloc_area_begin = _Heap_Alloc_area_of_block( block );
uintptr_t const alloc_area_offset = alloc_begin - alloc_area_begin;
Heap_Block *free_list_anchor = NULL;
_HAssert( alloc_area_begin <= alloc_begin );
if ( _Heap_Is_free( block ) ) {
free_list_anchor = block->prev;
_Heap_Free_list_remove( block );
/* Statistics */
--stats->free_blocks;
++stats->used_blocks;
stats->free_size -= _Heap_Block_size( block );
} else {
free_list_anchor = _Heap_Free_list_head( heap );
}
if ( alloc_area_offset < heap->page_size ) {
alloc_size += alloc_area_offset;
block = _Heap_Block_allocate_from_begin(
heap,
block,
free_list_anchor,
alloc_size
);
} else {
block = _Heap_Block_allocate_from_end(
heap,
block,
free_list_anchor,
alloc_begin,
alloc_size
);
}
/* Statistics */
if ( stats->min_free_size > stats->free_size ) {
stats->min_free_size = stats->free_size;
}
return block;
}
Heap_Block *_Heap_Greedy_allocate(
Heap_Control *heap,
const uintptr_t *block_sizes,
size_t block_count
)
{
Heap_Block *const free_list_tail = _Heap_Free_list_tail( heap );
Heap_Block *allocated_blocks = NULL;
Heap_Block *blocks = NULL;
Heap_Block *current;
size_t i;
_Heap_Protection_free_all_delayed_blocks( heap );
for (i = 0; i < block_count; ++i) {
void *next = _Heap_Allocate( heap, block_sizes [i] );
if ( next != NULL ) {
Heap_Block *next_block = _Heap_Block_of_alloc_area(
(uintptr_t) next,
heap->page_size
);
next_block->next = allocated_blocks;
allocated_blocks = next_block;
}
}
while ( (current = _Heap_Free_list_first( heap )) != free_list_tail ) {
_Heap_Block_allocate(
heap,
current,
_Heap_Alloc_area_of_block( current ),
_Heap_Block_size( current ) - HEAP_BLOCK_HEADER_SIZE
);
current->next = blocks;
blocks = current;
}
while ( allocated_blocks != NULL ) {
current = allocated_blocks;
allocated_blocks = allocated_blocks->next;
_Heap_Free( heap, (void *) _Heap_Alloc_area_of_block( current ) );
}
return blocks;
}
static void _Heap_Check_allocation(
const Heap_Control *heap,
const Heap_Block *block,
uintptr_t alloc_begin,
uintptr_t alloc_size,
uintptr_t alignment,
uintptr_t boundary
)
{
uintptr_t const min_block_size = heap->min_block_size;
uintptr_t const page_size = heap->page_size;
uintptr_t const block_begin = (uintptr_t) block;
uintptr_t const block_size = _Heap_Block_size( block );
uintptr_t const block_end = block_begin + block_size;
uintptr_t const alloc_end = alloc_begin + alloc_size;
uintptr_t const alloc_area_begin = _Heap_Alloc_area_of_block( block );
uintptr_t const alloc_area_offset = alloc_begin - alloc_area_begin;
_HAssert( block_size >= min_block_size );
_HAssert( block_begin < block_end );
_HAssert(
_Heap_Is_aligned( block_begin + HEAP_BLOCK_HEADER_SIZE, page_size )
);
_HAssert(
_Heap_Is_aligned( block_size, page_size )
);
_HAssert( alloc_end <= block_end + HEAP_ALLOC_BONUS );
_HAssert( alloc_area_begin == block_begin + HEAP_BLOCK_HEADER_SIZE);
_HAssert( alloc_area_offset < page_size );
_HAssert( _Heap_Is_aligned( alloc_area_begin, page_size ) );
if ( alignment == 0 ) {
_HAssert( alloc_begin == alloc_area_begin );
} else {
_HAssert( _Heap_Is_aligned( alloc_begin, alignment ) );
}
if ( boundary != 0 ) {
uintptr_t boundary_line = _Heap_Align_down( alloc_end, boundary );
_HAssert( alloc_size <= boundary );
_HAssert( boundary_line <= alloc_begin || alloc_end <= boundary_line );
}
}
static void _Heap_Protection_check_free_block(
Heap_Control *heap,
Heap_Block *block
)
{
uintptr_t *const pattern_begin = (uintptr_t *)
_Heap_Alloc_area_of_block( block );
uintptr_t *const pattern_end = (uintptr_t *)
((uintptr_t) block + _Heap_Block_size( block ) + HEAP_ALLOC_BONUS);
uintptr_t *current = NULL;
for ( current = pattern_begin; current != pattern_end; ++current ) {
if ( *current != HEAP_FREE_PATTERN ) {
_Heap_Protection_block_error( heap, block );
break;
}
}
}
void _Heap_Get_information(
Heap_Control *the_heap,
Heap_Information_block *the_info
)
{
Heap_Block *the_block = the_heap->first_block;
Heap_Block *const end = the_heap->last_block;
_HAssert(the_block->prev_size == the_heap->page_size);
_HAssert(_Heap_Is_prev_used(the_block));
the_info->Free.number = 0;
the_info->Free.total = 0;
the_info->Free.largest = 0;
the_info->Used.number = 0;
the_info->Used.total = 0;
the_info->Used.largest = 0;
while ( the_block != end ) {
uintptr_t const the_size = _Heap_Block_size(the_block);
Heap_Block *const next_block = _Heap_Block_at(the_block, the_size);
Heap_Information *info;
if ( _Heap_Is_prev_used(next_block) )
info = &the_info->Used;
else
info = &the_info->Free;
info->number++;
info->total += the_size;
if ( info->largest < the_size )
info->largest = the_size;
the_block = next_block;
}
/*
* Handle the last dummy block. Don't consider this block to be
* "used" as client never allocated it. Make 'Used.total' contain this
* blocks' overhead though.
*/
the_info->Used.total += HEAP_BLOCK_HEADER_SIZE;
}
void _Heap_Iterate(
Heap_Control *heap,
Heap_Block_visitor visitor,
void *visitor_arg
)
{
Heap_Block *current = heap->first_block;
Heap_Block *end = heap->last_block;
bool stop = false;
while ( !stop && current != end ) {
uintptr_t size = _Heap_Block_size( current );
Heap_Block *next = _Heap_Block_at( current, size );
bool used = _Heap_Is_prev_used( next );
stop = (*visitor)( current, size, used, visitor_arg );
current = next;
}
}
/*
* Allocate block of size 'alloc_size' from 'the_block' belonging to
* 'the_heap'. Split 'the_block' if possible, otherwise allocate it entirely.
* When split, make the upper part used, and leave the lower part free.
* Return the block allocated.
*
* NOTE: this is similar to _Heap_Block_allocate(), except it makes different
* part of the split block used, and returns address of the block instead of its
* size. We do need such variant for _Heap_Allocate_aligned() as we can't allow
* user pointer to be too far from the beginning of the block, so that we can
* recover start-of-block address from the user pointer without additional
* information stored in the heap.
*/
static
Heap_Block *block_allocate(
Heap_Control *the_heap,
Heap_Block *the_block,
uint32_t alloc_size)
{
Heap_Statistics *const stats = &the_heap->stats;
uint32_t const block_size = _Heap_Block_size(the_block);
uint32_t const the_rest = block_size - alloc_size;
_HAssert(_Heap_Is_aligned(block_size, the_heap->page_size));
_HAssert(_Heap_Is_aligned(alloc_size, the_heap->page_size));
_HAssert(alloc_size <= block_size);
_HAssert(_Heap_Is_prev_used(the_block));
if(the_rest >= the_heap->min_block_size) {
/* Split the block so that lower part is still free, and upper part
becomes used. */
the_block->size = the_rest | HEAP_PREV_USED;
the_block = _Heap_Block_at(the_block, the_rest);
the_block->prev_size = the_rest;
the_block->size = alloc_size;
}
else {
/* Don't split the block as remainder is either zero or too small to be
used as a separate free block. Change 'alloc_size' to the size of the
block and remove the block from the list of free blocks. */
_Heap_Block_remove(the_block);
alloc_size = block_size;
stats->free_blocks -= 1;
}
/* Mark the block as used (in the next block). */
_Heap_Block_at(the_block, alloc_size)->size |= HEAP_PREV_USED;
/* Update statistics */
stats->free_size -= alloc_size;
if(stats->min_free_size > stats->free_size)
stats->min_free_size = stats->free_size;
stats->used_blocks += 1;
return the_block;
}
static void test_heap_resize_block(void)
{
void *p1, *p2, *p3;
uintptr_t new_alloc_size = 0;
Heap_Block *block = NULL;
puts( "run tests for _Heap_Resize_Block()" );
puts( "\tgive a block outside the heap to the function" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = TestHeap.first_block - TEST_DEFAULT_PAGE_SIZE;
new_alloc_size = 1;
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_FATAL_ERROR );
puts( "\tincrease size");
puts( "\t\tlet the next block be used alredy and try to get a size bigger than the actual block" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = test_alloc_one_page();
rtems_test_assert( p1 );
p2 = test_alloc_one_page();
rtems_test_assert( p2 );
new_alloc_size = 3 * TEST_DEFAULT_PAGE_SIZE / 2;
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_UNSATISFIED );
puts( "\t\tnext block not used and try to set the new allocation size between the page-alignments" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = test_alloc_one_page();
new_alloc_size = 3 * TEST_DEFAULT_PAGE_SIZE / 2;
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_SUCCESSFUL );
puts( "\t\tlet the block after the next be used and try to allocate more then one pagesize more" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = test_alloc_one_page();
rtems_test_assert( p1 );
p2 = test_alloc_one_page();
rtems_test_assert( p2 );
p3 = test_alloc_one_page();
rtems_test_assert( p3 );
test_free( p2 );
new_alloc_size = 5 * TEST_DEFAULT_PAGE_SIZE / 2;
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_UNSATISFIED );
puts( "\ttry to resize to the same size" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = test_alloc_one_page();
block = _Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size );
new_alloc_size = _Heap_Block_size( block );
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_SUCCESSFUL );
puts( "\tdecrease size");
puts( "\t\tdecrease a block with two pages to one page" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = test_alloc_two_pages();
new_alloc_size = 1;
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_SUCCESSFUL );
puts( "\t\tresize the block to the size 0" );
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
p1 = test_alloc_one_page();
new_alloc_size = 0;
test_simple_resize_block( p1, new_alloc_size, HEAP_RESIZE_SUCCESSFUL );
}
static void test_block_alloc(
int free_variant,
int alloc_variant,
uintptr_t alloc_begin,
uintptr_t alloc_size
)
{
void *p1 = NULL;
void *p2 = NULL;
void *p3 = NULL;
uintptr_t size_fresh_heap = 0;
uintptr_t pages_per_default_block = 0;
uint32_t exp_free_pages = 0;
uint32_t exp_free_blocks = 0;
uint32_t exp_used_blocks = 0;
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
size_fresh_heap = _Heap_Get_size( &TestHeap );
exp_free_pages = size_fresh_heap / TestHeap.page_size;
p1 = test_create_used_block();
p2 = test_create_used_block();
p3 = test_create_used_block();
pages_per_default_block = _Heap_Block_size(
_Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size )
) / TestHeap.page_size;
if (free_variant == 1) {
test_free( p1 );
} else if (free_variant == 2) {
test_free( p3 );
} else if (free_variant == 3) {
test_free( p2 );
test_free( p3 );
}
_Heap_Block_allocate(
&TestHeap,
_Heap_Block_of_alloc_area( (uintptr_t) p2, test_page_size()),
alloc_begin,
alloc_size
);
test_check_alloc_simple( (void *) alloc_begin, alloc_size, 0, 0 );
/* check statistics */
switch( free_variant ) {
case 1:
exp_free_pages = exp_free_pages - 2 * pages_per_default_block;
exp_used_blocks = 2;
switch( alloc_variant ) {
case 1:
/* allocate block full space */
exp_free_blocks = 2;
break;
case 2:
/* allocate block in the middle */
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
exp_free_blocks = 3;
break;
case 3:
/* allocate block at the end */
exp_free_pages = exp_free_pages + pages_per_default_block - 2;
exp_free_blocks = 2;
break;
default:
/* allocate block at the beginning */
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
exp_free_blocks = 3;
break;
}
break;
case 2:
exp_free_pages = exp_free_pages - 2 * pages_per_default_block;
exp_used_blocks = 2;
switch( alloc_variant ) {
case 1:
/* allocate block full space */
exp_free_blocks = 1;
break;
case 2:
/* allocate block in the middle */
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
exp_free_blocks = 2;
break;
case 3:
/* allocate block at the end */
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
exp_free_blocks = 2;
break;
default:
/* allocate block at the beginning */
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
exp_free_blocks = 1;
break;
}
break;
case 3:
exp_free_pages = exp_free_pages - pages_per_default_block;
exp_used_blocks = 2;
switch( alloc_variant ) {
case 1:
/* allocate block full space */
exp_free_pages = exp_free_pages - pages_per_default_block;
exp_free_blocks = 1;
break;
case 2:
/* allocate block in the middle */
exp_free_pages = exp_free_pages - 1;
exp_free_blocks = 2;
break;
case 3:
/* allocate block at the end */
exp_free_pages = exp_free_pages - 2;
exp_free_blocks = 2;
break;
default:
/* allocate block at the beginning */
exp_free_pages = exp_free_pages - 1;
exp_free_blocks = 1;
break;
}
break;
default:
exp_free_pages = exp_free_pages - 3 * pages_per_default_block;
exp_used_blocks = 3;
switch( alloc_variant ) {
case 1:
/* allocate block full space */
exp_free_blocks = 1;
break;
case 2:
/* allocate block in the middle */
exp_free_blocks = 3;
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
break;
case 3:
/* allocate block at the end */
exp_free_blocks = 2;
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
break;
default:
/* allocate block at the beginning */
exp_free_blocks = 2;
exp_free_pages = exp_free_pages + pages_per_default_block - 1;
}
}
rtems_test_assert( TestHeap.stats.free_size == exp_free_pages * TestHeap.page_size );
rtems_test_assert( TestHeap.stats.free_blocks == exp_free_blocks );
rtems_test_assert( TestHeap.stats.used_blocks == exp_used_blocks );
}
void *_Heap_Allocate_aligned_with_boundary(
Heap_Control *heap,
uintptr_t alloc_size,
uintptr_t alignment,
uintptr_t boundary
)
{
Heap_Statistics *const stats = &heap->stats;
uintptr_t const block_size_floor = alloc_size + HEAP_BLOCK_HEADER_SIZE
- HEAP_ALLOC_BONUS;
uintptr_t const page_size = heap->page_size;
Heap_Block *block = NULL;
uintptr_t alloc_begin = 0;
uint32_t search_count = 0;
bool search_again = false;
if ( block_size_floor < alloc_size ) {
/* Integer overflow occured */
return NULL;
}
if ( boundary != 0 ) {
if ( boundary < alloc_size ) {
return NULL;
}
if ( alignment == 0 ) {
alignment = page_size;
}
}
do {
Heap_Block *const free_list_tail = _Heap_Free_list_tail( heap );
block = _Heap_Free_list_first( heap );
while ( block != free_list_tail ) {
_HAssert( _Heap_Is_prev_used( block ) );
_Heap_Protection_block_check( heap, block );
/*
* The HEAP_PREV_BLOCK_USED flag is always set in the block size_and_flag
* field. Thus the value is about one unit larger than the real block
* size. The greater than operator takes this into account.
*/
if ( block->size_and_flag > block_size_floor ) {
if ( alignment == 0 ) {
alloc_begin = _Heap_Alloc_area_of_block( block );
} else {
alloc_begin = _Heap_Check_block(
heap,
block,
alloc_size,
alignment,
boundary
);
}
}
/* Statistics */
++search_count;
if ( alloc_begin != 0 ) {
break;
}
block = block->next;
}
search_again = _Heap_Protection_free_delayed_blocks( heap, alloc_begin );
} while ( search_again );
if ( alloc_begin != 0 ) {
block = _Heap_Block_allocate( heap, block, alloc_begin, alloc_size );
_Heap_Check_allocation(
heap,
block,
alloc_begin,
alloc_size,
alignment,
boundary
);
/* Statistics */
++stats->allocs;
stats->searches += search_count;
stats->lifetime_allocated += _Heap_Block_size( block );
} else {
/* Statistics */
++stats->failed_allocs;
}
/* Statistics */
if ( stats->max_search < search_count ) {
stats->max_search = search_count;
}
return (void *) alloc_begin;
}
static void test_check_alloc(
void *alloc_begin_ptr,
void *expected_alloc_begin_ptr,
uintptr_t alloc_size,
uintptr_t alignment,
uintptr_t boundary
)
{
uintptr_t const min_block_size = TestHeap.min_block_size;
uintptr_t const page_size = TestHeap.page_size;
rtems_test_assert( alloc_begin_ptr == expected_alloc_begin_ptr );
if( expected_alloc_begin_ptr != NULL ) {
uintptr_t const alloc_begin = (uintptr_t ) alloc_begin_ptr;
uintptr_t const alloc_end = alloc_begin + alloc_size;
uintptr_t const alloc_area_begin = _Heap_Align_down( alloc_begin, page_size );
uintptr_t const alloc_area_offset = alloc_begin - alloc_area_begin;
#if UNUSED
uintptr_t const alloc_area_size = alloc_area_offset + alloc_size;
#endif
Heap_Block *block = _Heap_Block_of_alloc_area( alloc_area_begin, page_size );
uintptr_t const block_begin = (uintptr_t ) block;
uintptr_t const block_size = _Heap_Block_size( block );
uintptr_t const block_end = block_begin + block_size;
rtems_test_assert( block_size >= min_block_size );
rtems_test_assert( block_begin < block_end );
rtems_test_assert(
_Heap_Is_aligned( block_begin + HEAP_BLOCK_HEADER_SIZE, page_size )
);
rtems_test_assert(
_Heap_Is_aligned( block_size, page_size )
);
rtems_test_assert( alloc_end <= block_end + HEAP_ALLOC_BONUS );
rtems_test_assert( alloc_area_begin > block_begin );
rtems_test_assert( alloc_area_offset < page_size );
rtems_test_assert( _Heap_Is_aligned( alloc_area_begin, page_size ) );
if ( alignment == 0 ) {
rtems_test_assert( alloc_begin == alloc_area_begin );
} else {
rtems_test_assert( _Heap_Is_aligned( alloc_begin, alignment ) );
}
if ( boundary != 0 ) {
uintptr_t boundary_line = _Heap_Align_down( alloc_end, boundary );
rtems_test_assert( alloc_size <= boundary );
rtems_test_assert(
boundary_line <= alloc_begin
|| alloc_end <= boundary_line
);
}
}
rtems_test_assert(
page_size < CPU_ALIGNMENT
|| _Heap_Walk( &TestHeap, 0, false )
);
}
static void test_heap_allocate(void)
{
void *p1 = NULL;
void *p2 = NULL;
void *p3 = NULL;
uintptr_t alloc_size = 0;
uintptr_t alignment = 0;
uintptr_t boundary = 0;
uintptr_t page_size = 0;
uintptr_t first_page_begin = 0;
uintptr_t previous_last_block_begin = 0;
uintptr_t previous_last_page_begin = 0;
uintptr_t last_block_begin = 0;
uintptr_t last_alloc_begin = 0;
test_heap_init( TEST_DEFAULT_PAGE_SIZE );
last_block_begin = (uintptr_t) TestHeap.last_block;
last_alloc_begin = _Heap_Alloc_area_of_block( TestHeap.last_block );
puts( "run tests for _Heap_Allocate_aligned_with_boundary()");
puts( "\tcheck if NULL will be returned if size causes integer overflow" );
alloc_size = (uintptr_t ) -1;
alignment = 0;
boundary = 0;
test_init_and_alloc( alloc_size, alignment, boundary, NULL );
puts( "\ttry to allocate more space than the one which fits in the boundary" );
alloc_size = 2;
alignment = 0;
boundary = alloc_size - 1;
test_init_and_alloc( alloc_size, alignment, boundary, NULL );
puts( "\tcheck if alignment will be set to page size if only a boundary is given" );
alloc_size = 1;
boundary = 1;
alignment = 0;
p1 = test_init_and_alloc_simple( alloc_size, alignment, boundary );
alignment = test_page_size();
test_init_and_alloc( alloc_size, alignment, boundary, p1 );
puts( "\tcreate a block which is bigger then the first free space" );
alignment = 0;
boundary = 0;
alloc_size = test_page_size();
p1 = test_init_and_alloc_simple( alloc_size, alignment, boundary );
p2 = test_alloc_simple( alloc_size, alignment, boundary );
rtems_test_assert( p2 );
test_free( p1 );
alloc_size = 2 * alloc_size;
p3 = test_alloc_simple( alloc_size, alignment, boundary );
rtems_test_assert( p1 != p3 );
puts( "\tset boundary before allocation begin" );
alloc_size = 1;
alignment = 0;
boundary = last_alloc_begin - test_page_size();
p1 = test_init_and_alloc_simple( alloc_size, alignment, boundary );
rtems_test_assert( (uintptr_t ) p1 >= boundary );
puts( "\tset boundary between allocation begin and end" );
alloc_size = test_page_size();
alignment = 0;
boundary = last_alloc_begin - alloc_size / 2;
p1 = test_init_and_alloc_simple( alloc_size, alignment, boundary );
rtems_test_assert( (uintptr_t ) p1 + alloc_size <= boundary );
puts( "\tset boundary after allocation end" );
alloc_size = 1;
alignment = 0;
boundary = last_alloc_begin;
p1 = test_init_and_alloc_simple( alloc_size, alignment, boundary );
rtems_test_assert( (uintptr_t ) p1 + alloc_size < boundary );
puts( "\tset boundary on allocation end" );
alloc_size = TEST_DEFAULT_PAGE_SIZE - HEAP_BLOCK_HEADER_SIZE;
alignment = 0;
boundary = last_block_begin;
p1 = (void *) (last_alloc_begin - TEST_DEFAULT_PAGE_SIZE);
test_init_and_alloc( alloc_size, alignment, boundary, p1);
puts( "\talign the allocation to different positions in the block header" );
page_size = sizeof(uintptr_t);
alloc_size = 1;
boundary = 0;
test_heap_init( page_size );
/* Force the page size to a small enough value */
TestHeap.page_size = page_size;
alignment = first_page_begin - sizeof(uintptr_t);
p1 = test_alloc( alloc_size, alignment, boundary, NULL );
first_page_begin = ((uintptr_t) TestHeap.first_block ) + HEAP_BLOCK_HEADER_SIZE;
alignment = first_page_begin + sizeof(uintptr_t);
p1 = test_alloc( alloc_size, alignment, boundary, NULL );
first_page_begin = ((uintptr_t) TestHeap.first_block )
+ HEAP_BLOCK_HEADER_SIZE;
alignment = first_page_begin;
p1 = test_alloc_simple( alloc_size, alignment, boundary );
puts( "\tallocate last block with different boundarys" );
page_size = TEST_DEFAULT_PAGE_SIZE;
test_heap_init( page_size );
previous_last_block_begin = ((uintptr_t) TestHeap.last_block )
- TestHeap.min_block_size;
previous_last_page_begin = previous_last_block_begin
+ HEAP_BLOCK_HEADER_SIZE;
alloc_size = TestHeap.page_size - HEAP_BLOCK_HEADER_SIZE;
alignment = sizeof(uintptr_t);
boundary = 0;
p1 = test_alloc( alloc_size, alignment, boundary, (void *) (previous_last_page_begin + sizeof(uintptr_t)));
test_heap_init( page_size );
boundary = ((uintptr_t) TestHeap.last_block );
p1 = test_alloc( alloc_size, alignment, boundary, (void *) previous_last_page_begin );
puts( "\tbreak the boundaries and aligns more than one time" );
page_size = CPU_ALIGNMENT * 20;
alloc_size = page_size / 4;
alignment = page_size / 5;
boundary = page_size / 4;
test_heap_init( page_size );
p1 = (void *) (_Heap_Alloc_area_of_block( TestHeap.last_block ) - page_size );
test_alloc( alloc_size, alignment, boundary, p1);
puts( "\tdifferent combinations, so that there is no valid block at the end" );
page_size = sizeof(uintptr_t);
test_heap_init( 0 );
/* Force the page size to a small enough value */
TestHeap.page_size = page_size;
alloc_size = 1;
alignment = (uintptr_t) TestHeap.last_block;
boundary = 0;
p1 = test_alloc( alloc_size, alignment, boundary, NULL );
boundary = (uintptr_t) TestHeap.last_block;
p1 = test_alloc( alloc_size, alignment, boundary, NULL );
alloc_size = 0;
p1 = test_alloc( alloc_size, alignment, boundary, NULL );
alloc_size = 1;
alignment = sizeof(uintptr_t);
boundary = 0;
p1 = test_alloc_simple( alloc_size, alignment, boundary );
puts( "\ttry to create a block, which is not possible because of the alignment and boundary" );
alloc_size = 2;
boundary = _Heap_Alloc_area_of_block( TestHeap.first_block )
+ _Heap_Block_size( TestHeap.first_block ) / 2;
alignment = boundary - 1;
p1 = test_init_and_alloc( alloc_size, alignment, boundary, NULL );
alloc_size = 2;
alignment = _Heap_Alloc_area_of_block( TestHeap.first_block );
boundary = alignment + 1;
p1 = test_init_and_alloc( alloc_size, alignment, boundary, NULL );
}
bool _Heap_Free( Heap_Control *heap, void *alloc_begin_ptr )
{
Heap_Statistics *const stats = &heap->stats;
uintptr_t alloc_begin;
Heap_Block *block;
Heap_Block *next_block = NULL;
uintptr_t block_size = 0;
uintptr_t next_block_size = 0;
bool next_is_free = false;
/*
* If NULL return true so a free on NULL is considered a valid release. This
* is a special case that could be handled by the in heap check how-ever that
* would result in false being returned which is wrong.
*/
if ( alloc_begin_ptr == NULL ) {
return true;
}
alloc_begin = (uintptr_t) alloc_begin_ptr;
block = _Heap_Block_of_alloc_area( alloc_begin, heap->page_size );
if ( !_Heap_Is_block_in_heap( heap, block ) ) {
return false;
}
_Heap_Protection_block_check( heap, block );
block_size = _Heap_Block_size( block );
next_block = _Heap_Block_at( block, block_size );
if ( !_Heap_Is_block_in_heap( heap, next_block ) ) {
return false;
}
_Heap_Protection_block_check( heap, next_block );
if ( !_Heap_Is_prev_used( next_block ) ) {
_Heap_Protection_block_error( heap, block );
return false;
}
if ( !_Heap_Protection_determine_block_free( heap, block ) ) {
return true;
}
next_block_size = _Heap_Block_size( next_block );
next_is_free = next_block != heap->last_block
&& !_Heap_Is_prev_used( _Heap_Block_at( next_block, next_block_size ));
if ( !_Heap_Is_prev_used( block ) ) {
uintptr_t const prev_size = block->prev_size;
Heap_Block * const prev_block = _Heap_Block_at( block, -prev_size );
if ( !_Heap_Is_block_in_heap( heap, prev_block ) ) {
_HAssert( false );
return( false );
}
/* As we always coalesce free blocks, the block that preceedes prev_block
must have been used. */
if ( !_Heap_Is_prev_used ( prev_block) ) {
_HAssert( false );
return( false );
}
if ( next_is_free ) { /* coalesce both */
uintptr_t const size = block_size + prev_size + next_block_size;
_Heap_Free_list_remove( next_block );
stats->free_blocks -= 1;
prev_block->size_and_flag = size | HEAP_PREV_BLOCK_USED;
next_block = _Heap_Block_at( prev_block, size );
_HAssert(!_Heap_Is_prev_used( next_block));
next_block->prev_size = size;
} else { /* coalesce prev */
uintptr_t const size = block_size + prev_size;
prev_block->size_and_flag = size | HEAP_PREV_BLOCK_USED;
next_block->size_and_flag &= ~HEAP_PREV_BLOCK_USED;
next_block->prev_size = size;
}
} else if ( next_is_free ) { /* coalesce next */
uintptr_t const size = block_size + next_block_size;
_Heap_Free_list_replace( next_block, block );
block->size_and_flag = size | HEAP_PREV_BLOCK_USED;
next_block = _Heap_Block_at( block, size );
next_block->prev_size = size;
} else { /* no coalesce */
/* Add 'block' to the head of the free blocks list as it tends to
produce less fragmentation than adding to the tail. */
_Heap_Free_list_insert_after( _Heap_Free_list_head( heap), block );
block->size_and_flag = block_size | HEAP_PREV_BLOCK_USED;
next_block->size_and_flag &= ~HEAP_PREV_BLOCK_USED;
next_block->prev_size = block_size;
/* Statistics */
++stats->free_blocks;
if ( stats->max_free_blocks < stats->free_blocks ) {
stats->max_free_blocks = stats->free_blocks;
}
}
/* Statistics */
--stats->used_blocks;
++stats->frees;
stats->free_size += block_size;
return( true );
}
bool _Heap_Free( Heap_Control *heap, void *alloc_begin_ptr )
{
Heap_Statistics *const stats = &heap->stats;
uintptr_t alloc_begin = (uintptr_t) alloc_begin_ptr;
Heap_Block *block =
_Heap_Block_of_alloc_area( alloc_begin, heap->page_size );
Heap_Block *next_block = NULL;
uintptr_t block_size = 0;
uintptr_t next_block_size = 0;
bool next_is_free = false;
if ( !_Heap_Is_block_in_heap( heap, block ) ) {
return false;
}
block_size = _Heap_Block_size( block );
next_block = _Heap_Block_at( block, block_size );
if ( !_Heap_Is_block_in_heap( heap, next_block ) ) {
_HAssert( false );
return false;
}
if ( !_Heap_Is_prev_used( next_block ) ) {
_HAssert( false );
return false;
}
next_block_size = _Heap_Block_size( next_block );
next_is_free = next_block != heap->last_block
&& !_Heap_Is_prev_used( _Heap_Block_at( next_block, next_block_size ));
if ( !_Heap_Is_prev_used( block ) ) {
uintptr_t const prev_size = block->prev_size;
Heap_Block * const prev_block = _Heap_Block_at( block, -prev_size );
if ( !_Heap_Is_block_in_heap( heap, prev_block ) ) {
_HAssert( false );
return( false );
}
/* As we always coalesce free blocks, the block that preceedes prev_block
must have been used. */
if ( !_Heap_Is_prev_used ( prev_block) ) {
_HAssert( false );
return( false );
}
if ( next_is_free ) { /* coalesce both */
uintptr_t const size = block_size + prev_size + next_block_size;
_Heap_Free_list_remove( next_block );
stats->free_blocks -= 1;
prev_block->size_and_flag = size | HEAP_PREV_BLOCK_USED;
next_block = _Heap_Block_at( prev_block, size );
_HAssert(!_Heap_Is_prev_used( next_block));
next_block->prev_size = size;
} else { /* coalesce prev */
uintptr_t const size = block_size + prev_size;
prev_block->size_and_flag = size | HEAP_PREV_BLOCK_USED;
next_block->size_and_flag &= ~HEAP_PREV_BLOCK_USED;
next_block->prev_size = size;
}
} else if ( next_is_free ) { /* coalesce next */
uintptr_t const size = block_size + next_block_size;
_Heap_Free_list_replace( next_block, block );
block->size_and_flag = size | HEAP_PREV_BLOCK_USED;
next_block = _Heap_Block_at( block, size );
next_block->prev_size = size;
} else { /* no coalesce */
/* Add 'block' to the head of the free blocks list as it tends to
produce less fragmentation than adding to the tail. */
_Heap_Free_list_insert_after( _Heap_Free_list_head( heap), block );
block->size_and_flag = block_size | HEAP_PREV_BLOCK_USED;
next_block->size_and_flag &= ~HEAP_PREV_BLOCK_USED;
next_block->prev_size = block_size;
/* Statistics */
++stats->free_blocks;
if ( stats->max_free_blocks < stats->free_blocks ) {
stats->max_free_blocks = stats->free_blocks;
}
}
/* Statistics */
--stats->used_blocks;
++stats->frees;
stats->free_size += block_size;
return( true );
}
boolean _Heap_Walk(
Heap_Control *the_heap,
int source,
boolean do_dump
)
{
Heap_Block *the_block = the_heap->start;
Heap_Block *const end = the_heap->final;
Heap_Block *const tail = _Heap_Tail(the_heap);
int error = 0;
int passes = 0;
do_dump = FALSE;
/*
* We don't want to allow walking the heap until we have
* transferred control to the user task so we watch the
* system state.
*/
/*
if ( !_System_state_Is_up( _System_state_Get() ) )
return TRUE;
*/
if (source < 0)
source = the_heap->stats.instance;
if (do_dump == TRUE)
printk("\nPASS: %d start %p final %p first %p last %p begin %p end %p\n",
source, the_block, end,
_Heap_First(the_heap), _Heap_Last(the_heap),
the_heap->begin, the_heap->end);
/*
* Handle the 1st block
*/
if (!_Heap_Is_prev_used(the_block)) {
printk("PASS: %d !HEAP_PREV_USED flag of 1st block isn't set\n", source);
error = 1;
}
if (the_block->prev_size != the_heap->page_size) {
printk("PASS: %d !prev_size of 1st block isn't page_size\n", source);
error = 1;
}
while ( the_block != end ) {
uint32_t const the_size = _Heap_Block_size(the_block);
Heap_Block *const next_block = _Heap_Block_at(the_block, the_size);
boolean prev_used = _Heap_Is_prev_used(the_block);
if (do_dump) {
printk("PASS: %d block %p size %d(%c)",
source, the_block, the_size, (prev_used ? 'U' : 'F'));
if (prev_used)
printk(" prev_size %d", the_block->prev_size);
else
printk(" (prev_size) %d", the_block->prev_size);
}
if (!_Heap_Is_block_in(the_heap, next_block)) {
if (do_dump) printk("\n");
printk("PASS: %d !block %p is out of heap\n", source, next_block);
error = 1;
break;
}
if (!_Heap_Is_prev_used(next_block)) {
if (do_dump)
printk( " prev %p next %p", the_block->prev, the_block->next);
if (_Heap_Block_size(the_block) != next_block->prev_size) {
if (do_dump) printk("\n");
printk("PASS: %d !front and back sizes don't match", source);
error = 1;
}
if (!prev_used) {
if (do_dump || error) printk("\n");
printk("PASS: %d !two consecutive blocks are free", source);
error = 1;
}
{ /* Check if 'the_block' is in the free block list */
Heap_Block* block = _Heap_First(the_heap);
while(block != the_block && block != tail)
block = block->next;
if(block != the_block) {
if (do_dump || error) printk("\n");
printk("PASS: %d !the_block not in the free list", source);
error = 1;
}
}
}
if (do_dump || error) printk("\n");
if (the_size < the_heap->min_block_size) {
printk("PASS: %d !block size is too small\n", source);
error = 1;
break;
}
if (!_Heap_Is_aligned( the_size, the_heap->page_size)) {
printk("PASS: %d !block size is misaligned\n", source);
error = 1;
}
if (++passes > (do_dump ? 10 : 0) && error)
break;
the_block = next_block;
}
if (the_block != end) {
printk("PASS: %d !last block address isn't equal to 'final' %p %p\n",
source, the_block, end);
error = 1;
}
if (_Heap_Block_size(the_block) != the_heap->page_size) {
printk("PASS: %d !last block's size isn't page_size (%d != %d)\n", source,
_Heap_Block_size(the_block), the_heap->page_size);
error = 1;
}
if(do_dump && error)
_Internal_error_Occurred( INTERNAL_ERROR_CORE, TRUE, 0xffff0000 );
return error;
}
uintptr_t _Heap_Extend(
Heap_Control *heap,
void *extend_area_begin_ptr,
uintptr_t extend_area_size,
uintptr_t unused __attribute__((unused))
)
{
Heap_Statistics *const stats = &heap->stats;
Heap_Block *const first_block = heap->first_block;
Heap_Block *start_block = first_block;
Heap_Block *merge_below_block = NULL;
Heap_Block *merge_above_block = NULL;
Heap_Block *link_below_block = NULL;
Heap_Block *link_above_block = NULL;
Heap_Block *extend_first_block = NULL;
Heap_Block *extend_last_block = NULL;
uintptr_t const page_size = heap->page_size;
uintptr_t const min_block_size = heap->min_block_size;
uintptr_t const extend_area_begin = (uintptr_t) extend_area_begin_ptr;
uintptr_t const extend_area_end = extend_area_begin + extend_area_size;
uintptr_t const free_size = stats->free_size;
uintptr_t extend_first_block_size = 0;
uintptr_t extended_size = 0;
bool extend_area_ok = false;
if ( extend_area_end < extend_area_begin ) {
return 0;
}
extend_area_ok = _Heap_Get_first_and_last_block(
extend_area_begin,
extend_area_size,
page_size,
min_block_size,
&extend_first_block,
&extend_last_block
);
if (!extend_area_ok ) {
/* For simplicity we reject extend areas that are too small */
return 0;
}
do {
uintptr_t const sub_area_begin = (start_block != first_block) ?
(uintptr_t) start_block : heap->area_begin;
uintptr_t const sub_area_end = start_block->prev_size;
Heap_Block *const end_block =
_Heap_Block_of_alloc_area( sub_area_end, page_size );
if (
sub_area_end > extend_area_begin && extend_area_end > sub_area_begin
) {
return 0;
}
if ( extend_area_end == sub_area_begin ) {
merge_below_block = start_block;
} else if ( extend_area_end < sub_area_end ) {
link_below_block = start_block;
}
if ( sub_area_end == extend_area_begin ) {
start_block->prev_size = extend_area_end;
merge_above_block = end_block;
} else if ( sub_area_end < extend_area_begin ) {
link_above_block = end_block;
}
start_block = _Heap_Block_at( end_block, _Heap_Block_size( end_block ) );
} while ( start_block != first_block );
if ( extend_area_begin < heap->area_begin ) {
heap->area_begin = extend_area_begin;
} else if ( heap->area_end < extend_area_end ) {
heap->area_end = extend_area_end;
}
extend_first_block_size =
(uintptr_t) extend_last_block - (uintptr_t) extend_first_block;
extend_first_block->prev_size = extend_area_end;
extend_first_block->size_and_flag =
extend_first_block_size | HEAP_PREV_BLOCK_USED;
_Heap_Protection_block_initialize( heap, extend_first_block );
extend_last_block->prev_size = extend_first_block_size;
extend_last_block->size_and_flag = 0;
_Heap_Protection_block_initialize( heap, extend_last_block );
if ( (uintptr_t) extend_first_block < (uintptr_t) heap->first_block ) {
heap->first_block = extend_first_block;
} else if ( (uintptr_t) extend_last_block > (uintptr_t) heap->last_block ) {
heap->last_block = extend_last_block;
}
if ( merge_below_block != NULL ) {
_Heap_Merge_below( heap, extend_area_begin, merge_below_block );
} else if ( link_below_block != NULL ) {
_Heap_Link_below(
link_below_block,
extend_last_block
);
}
if ( merge_above_block != NULL ) {
_Heap_Merge_above( heap, merge_above_block, extend_area_end );
} else if ( link_above_block != NULL ) {
_Heap_Link_above(
link_above_block,
extend_first_block,
extend_last_block
);
}
if ( merge_below_block == NULL && merge_above_block == NULL ) {
_Heap_Free_block( heap, extend_first_block );
}
_Heap_Set_last_block_size( heap );
extended_size = stats->free_size - free_size;
/* Statistics */
stats->size += extended_size;
return extended_size;
}
static bool _Heap_Walk_check_control(
int source,
Heap_Walk_printer printer,
Heap_Control *heap
)
{
uintptr_t const page_size = heap->page_size;
uintptr_t const min_block_size = heap->min_block_size;
Heap_Block *const first_free_block = _Heap_Free_list_first( heap );
Heap_Block *const last_free_block = _Heap_Free_list_last( heap );
Heap_Block *const first_block = heap->first_block;
Heap_Block *const last_block = heap->last_block;
(*printer)(
source,
false,
"page size %u, min block size %u\n"
"\tarea begin 0x%08x, area end 0x%08x\n"
"\tfirst block 0x%08x, last block 0x%08x\n"
"\tfirst free 0x%08x, last free 0x%08x\n",
page_size, min_block_size,
heap->area_begin, heap->area_end,
first_block, last_block,
first_free_block, last_free_block
);
if ( page_size == 0 ) {
(*printer)( source, true, "page size is zero\n" );
return false;
}
if ( !_Addresses_Is_aligned( (void *) page_size ) ) {
(*printer)(
source,
true,
"page size %u not CPU aligned\n",
page_size
);
return false;
}
if ( !_Heap_Is_aligned( min_block_size, page_size ) ) {
(*printer)(
source,
true,
"min block size %u not page aligned\n",
min_block_size
);
return false;
}
if (
!_Heap_Is_aligned( _Heap_Alloc_area_of_block( first_block ), page_size )
) {
(*printer)(
source,
true,
"first block 0x%08x: alloc area not page aligned\n",
first_block
);
return false;
}
if ( !_Heap_Is_prev_used( first_block ) ) {
(*printer)(
source,
true,
"first block: HEAP_PREV_BLOCK_USED is cleared\n"
);
return false;
}
if ( _Heap_Is_free( last_block ) ) {
(*printer)(
source,
true,
"last block: is free\n"
);
return false;
}
if (
_Heap_Block_at( last_block, _Heap_Block_size( last_block ) ) != first_block
) {
(*printer)(
source,
true,
"last block: next block is not the first block\n"
);
return false;
}
return _Heap_Walk_check_free_list( source, printer, heap );
}
static bool _Heap_Walk_check_free_block(
int source,
Heap_Walk_printer printer,
Heap_Control *heap,
Heap_Block *block
)
{
Heap_Block *const free_list_tail = _Heap_Free_list_tail( heap );
Heap_Block *const free_list_head = _Heap_Free_list_head( heap );
Heap_Block *const first_free_block = _Heap_Free_list_first( heap );
Heap_Block *const last_free_block = _Heap_Free_list_last( heap );
bool const prev_used = _Heap_Is_prev_used( block );
uintptr_t const block_size = _Heap_Block_size( block );
Heap_Block *const next_block = _Heap_Block_at( block, block_size );
(*printer)(
source,
false,
"block 0x%08x: size %u, prev 0x%08x%s, next 0x%08x%s\n",
block,
block_size,
block->prev,
block->prev == first_free_block ?
" (= first free)"
: (block->prev == free_list_head ? " (= head)" : ""),
block->next,
block->next == last_free_block ?
" (= last free)"
: (block->next == free_list_tail ? " (= tail)" : "")
);
if ( block_size != next_block->prev_size ) {
(*printer)(
source,
true,
"block 0x%08x: size %u != size %u (in next block 0x%08x)\n",
block,
block_size,
next_block->prev_size,
next_block
);
return false;
}
if ( !prev_used ) {
(*printer)(
source,
true,
"block 0x%08x: two consecutive blocks are free\n",
block
);
return false;
}
if ( !_Heap_Walk_is_in_free_list( heap, block ) ) {
(*printer)(
source,
true,
"block 0x%08x: free block not in free list\n",
block
);
return false;
}
return true;
}
static void test_main_loop(void)
{
void *p1 = NULL;
void *p2 = NULL;
Heap_Block *block = NULL;
Heap_Block *next_block = NULL;
puts( "Test the main loop" );
puts( "\tset the blocksize so, that the next block is outside the heap" );
test_heap_init_custom();
/* use all blocks */
p1 = test_fill_heap();
block = _Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size );
block->size_and_flag = ( 2 * _Heap_Block_size( block ) ) | HEAP_PREV_BLOCK_USED;
test_call_heap_walk( false );
puts( "\twalk a heap with blocks with different states of the previous-used flag" );
test_heap_init_custom();
test_create_heap_with_gaps();
test_allocate_block(); /* fill one gap */
test_call_heap_walk( true );
puts( "\tcreate a block with a not page aligned size" );
test_heap_init_custom();
p1 = test_allocate_block();
p2 = test_allocate_block();
_Heap_Free( &TestHeap, p1 );
block = _Heap_Block_of_alloc_area( (uintptr_t) p2, TestHeap.page_size );
block->size_and_flag = (3 * TestHeap.page_size / 2) & ~HEAP_PREV_BLOCK_USED;
test_call_heap_walk( false );
puts( "\tcreate a block with a size smaller than the min_block_size" );
test_heap_init_default();
p1 = test_allocate_block();
p2 = test_allocate_block();
_Heap_Free( &TestHeap, p1 );
block = _Heap_Block_of_alloc_area( (uintptr_t) p2, TestHeap.page_size );
block->size_and_flag = 0;
test_call_heap_walk( false );
puts( "\tmake a block with a size, so that the block reaches into the next block" );
test_heap_init_default();
p1 = test_allocate_block();
p2 = test_allocate_block();
block = _Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size );
block->size_and_flag = ( 3 * _Heap_Block_size( block ) / 2 ) | HEAP_PREV_BLOCK_USED;
test_call_heap_walk( false );
puts( "\tcreate a block with invalid successor" );
test_heap_init_default();
test_allocate_block();
p1 = test_allocate_block();
block = _Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size );
block->size_and_flag = (0 - TestHeap.page_size) | HEAP_PREV_BLOCK_USED;
test_call_heap_walk( false );
puts( "\tmake a block with a size, so that it includes the next block" );
test_heap_init_default();
p1 = test_allocate_block();
p2 = test_allocate_block();
block = _Heap_Block_of_alloc_area( (uintptr_t) p1, TestHeap.page_size );
next_block = _Heap_Block_at( block, _Heap_Block_size( block ) );
block->size_and_flag = ( _Heap_Block_size( block ) + _Heap_Block_size( next_block ) ) | HEAP_PREV_BLOCK_USED;
test_call_heap_walk( true );
}
bool _Heap_Walk(
Heap_Control *heap,
int source,
bool dump
)
{
uintptr_t const page_size = heap->page_size;
uintptr_t const min_block_size = heap->min_block_size;
Heap_Block *const first_block = heap->first_block;
Heap_Block *const last_block = heap->last_block;
Heap_Block *block = first_block;
Heap_Walk_printer printer = dump ?
_Heap_Walk_print : _Heap_Walk_print_nothing;
if ( !_System_state_Is_up( _System_state_Get() ) ) {
return true;
}
if ( !_Heap_Walk_check_control( source, printer, heap ) ) {
return false;
}
do {
uintptr_t const block_begin = (uintptr_t) block;
uintptr_t const block_size = _Heap_Block_size( block );
bool const prev_used = _Heap_Is_prev_used( block );
Heap_Block *const next_block = _Heap_Block_at( block, block_size );
uintptr_t const next_block_begin = (uintptr_t) next_block;
bool const is_not_last_block = block != last_block;
if ( !_Heap_Is_block_in_heap( heap, next_block ) ) {
(*printer)(
source,
true,
"block 0x%08x: next block 0x%08x not in heap\n",
block,
next_block
);
return false;
}
if ( !_Heap_Is_aligned( block_size, page_size ) && is_not_last_block ) {
(*printer)(
source,
true,
"block 0x%08x: block size %u not page aligned\n",
block,
block_size
);
return false;
}
if ( block_size < min_block_size && is_not_last_block ) {
(*printer)(
source,
true,
"block 0x%08x: size %u < min block size %u\n",
block,
block_size,
min_block_size
);
return false;
}
if ( next_block_begin <= block_begin && is_not_last_block ) {
(*printer)(
source,
true,
"block 0x%08x: next block 0x%08x is not a successor\n",
block,
next_block
);
return false;
}
if ( !_Heap_Is_prev_used( next_block ) ) {
if ( !_Heap_Walk_check_free_block( source, printer, heap, block ) ) {
return false;
}
} else if (prev_used) {
(*printer)(
source,
false,
"block 0x%08x: size %u\n",
block,
block_size
);
} else {
(*printer)(
source,
false,
"block 0x%08x: size %u, prev_size %u\n",
block,
block_size,
block->prev_size
);
}
block = next_block;
} while ( block != first_block );
return true;
}
void *_Heap_Allocate_aligned(
Heap_Control *the_heap,
size_t size,
uint32_t alignment
)
{
uint32_t search_count;
Heap_Block *the_block;
void *user_ptr = NULL;
uint32_t const page_size = the_heap->page_size;
Heap_Statistics *const stats = &the_heap->stats;
Heap_Block *const tail = _Heap_Tail(the_heap);
uint32_t const end_to_user_offs = size - HEAP_BLOCK_HEADER_OFFSET;
uint32_t const the_size =
_Heap_Calc_block_size(size, page_size, the_heap->min_block_size);
if(the_size == 0)
return NULL;
if(alignment == 0)
alignment = CPU_ALIGNMENT;
/* Find large enough free block that satisfies the alignment requirements. */
for(the_block = _Heap_First(the_heap), search_count = 0;
the_block != tail;
the_block = the_block->next, ++search_count)
{
uint32_t const block_size = _Heap_Block_size(the_block);
/* As we always coalesce free blocks, prev block must have been used. */
_HAssert(_Heap_Is_prev_used(the_block));
if(block_size >= the_size) { /* the_block is large enough. */
_H_uptr_t user_addr;
_H_uptr_t aligned_user_addr;
_H_uptr_t const user_area = _H_p2u(_Heap_User_area(the_block));
/* Calculate 'aligned_user_addr' that will become the user pointer we
return. It should be at least 'end_to_user_offs' bytes less than the
the 'block_end' and should be aligned on 'alignment' boundary.
Calculations are from the 'block_end' as we are going to split free
block so that the upper part of the block becomes used block. */
_H_uptr_t const block_end = _H_p2u(the_block) + block_size;
aligned_user_addr = block_end - end_to_user_offs;
_Heap_Align_down_uptr(&aligned_user_addr, alignment);
/* 'user_addr' is the 'aligned_user_addr' further aligned down to the
'page_size' boundary. We need it as blocks' user areas should begin
only at 'page_size' aligned addresses */
user_addr = aligned_user_addr;
_Heap_Align_down_uptr(&user_addr, page_size);
/* Make sure 'user_addr' calculated didn't run out of 'the_block'. */
if(user_addr >= user_area) {
/* The block seems to be acceptable. Check if the remainder of
'the_block' is less than 'min_block_size' so that 'the_block' won't
actually be split at the address we assume. */
if(user_addr - user_area < the_heap->min_block_size) {
/* The block won't be split, so 'user_addr' will be equal to the
'user_area'. */
user_addr = user_area;
/* We can't allow the distance between 'user_addr' and
'aligned_user_addr' to be outside of [0,page_size) range. If we do,
we will need to store this distance somewhere to be able to
resurrect the block address from the user pointer. (Having the
distance within [0,page_size) range allows resurrection by
aligning user pointer down to the nearest 'page_size' boundary.) */
if(aligned_user_addr - user_addr >= page_size) {
/* The user pointer will be too far from 'user_addr'. See if we
can make 'aligned_user_addr' to be close enough to the
'user_addr'. */
aligned_user_addr = user_addr;
_Heap_Align_up_uptr(&aligned_user_addr, alignment);
if(aligned_user_addr - user_addr >= page_size) {
/* No, we can't use the block */
aligned_user_addr = 0;
}
}
}
if(aligned_user_addr) {
/* The block is indeed acceptable: calculate the size of the block
to be allocated and perform allocation. */
uint32_t const alloc_size =
block_end - user_addr + HEAP_BLOCK_USER_OFFSET;
_HAssert(_Heap_Is_aligned_ptr((void*)aligned_user_addr, alignment));
the_block = block_allocate(the_heap, the_block, alloc_size);
stats->searches += search_count + 1;
stats->allocs += 1;
check_result(the_heap, the_block, user_addr,
aligned_user_addr, size);
user_ptr = (void*)aligned_user_addr;
break;
}
}
}
}
if(stats->max_search < search_count)
stats->max_search = search_count;
return user_ptr;
}