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Fix JMEM_HEAP_END_OF_LIST for pointers larger than 32 bits

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For 64 bit pointers, 0xffffffff as end-of-list marker pointer does
not work, as the marker is expected to be greater than the start
address of the heap area (and also max 0xffffffff away), but on 64
bit systems, the heap can start on higher addresses, i.e., above
0x100000000.

This patch changes JMEM_HEAP_END_OF_LIST from pointer to offset.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
This commit is contained in:
Akos Kiss 2016-08-16 01:22:41 +03:00
parent 7c50dc1691
commit 8edab96162
1 changed files with 9 additions and 8 deletions
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17
jerry-core/jmem/jmem-heap.c
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@ -87,7 +87,7 @@ void jmem_heap_valgrind_freya_mempool_request (void)
/**
* End of list marker.
*/
#define JMEM_HEAP_END_OF_LIST ((jmem_heap_free_t *const) ~((uint32_t) 0x0))
#define JMEM_HEAP_END_OF_LIST ((uint32_t) 0xffffffff)
#if UINTPTR_MAX > UINT32_MAX
#define JMEM_HEAP_GET_OFFSET_FROM_ADDR(p) ((uint32_t) ((uint8_t *) (p) - JERRY_HEAP_CONTEXT (area)))
@ -155,7 +155,7 @@ jmem_heap_init (void)
jmem_heap_free_t *const region_p = (jmem_heap_free_t *) JERRY_HEAP_CONTEXT (area);
region_p->size = JMEM_HEAP_AREA_SIZE;
region_p->next_offset = JMEM_HEAP_GET_OFFSET_FROM_ADDR (JMEM_HEAP_END_OF_LIST);
region_p->next_offset = JMEM_HEAP_END_OF_LIST;
JERRY_HEAP_CONTEXT (first).size = 0;
JERRY_HEAP_CONTEXT (first).next_offset = JMEM_HEAP_GET_OFFSET_FROM_ADDR (region_p);
@ -196,7 +196,7 @@ void *jmem_heap_alloc_block_internal (const size_t size)
// Fast path for 8 byte chunks, first region is guaranteed to be sufficient
if (required_size == JMEM_ALIGNMENT
&& likely (JERRY_HEAP_CONTEXT (first).next_offset != JMEM_HEAP_GET_OFFSET_FROM_ADDR (JMEM_HEAP_END_OF_LIST)))
&& likely (JERRY_HEAP_CONTEXT (first).next_offset != JMEM_HEAP_END_OF_LIST))
{
data_space_p = JMEM_HEAP_GET_ADDR_FROM_OFFSET (JERRY_HEAP_CONTEXT (first).next_offset);
JERRY_ASSERT (jmem_is_heap_pointer (data_space_p));
@ -234,18 +234,19 @@ void *jmem_heap_alloc_block_internal (const size_t size)
// Slow path for larger regions
else
{
jmem_heap_free_t *current_p = JMEM_HEAP_GET_ADDR_FROM_OFFSET (JERRY_HEAP_CONTEXT (first).next_offset);
uint32_t current_offset = JERRY_HEAP_CONTEXT (first).next_offset;
jmem_heap_free_t *prev_p = &JERRY_HEAP_CONTEXT (first);
while (current_p != JMEM_HEAP_END_OF_LIST)
while (current_offset != JMEM_HEAP_END_OF_LIST)
{
jmem_heap_free_t *current_p = JMEM_HEAP_GET_ADDR_FROM_OFFSET (current_offset);
JERRY_ASSERT (jmem_is_heap_pointer (current_p));
VALGRIND_DEFINED_SPACE (current_p, sizeof (jmem_heap_free_t));
JMEM_HEAP_STAT_ALLOC_ITER ();
const uint32_t next_offset = current_p->next_offset;
JERRY_ASSERT (jmem_is_heap_pointer (JMEM_HEAP_GET_ADDR_FROM_OFFSET (next_offset))
|| next_offset == JMEM_HEAP_GET_OFFSET_FROM_ADDR (JMEM_HEAP_END_OF_LIST));
JERRY_ASSERT (next_offset == JMEM_HEAP_END_OF_LIST
|| jmem_is_heap_pointer (JMEM_HEAP_GET_ADDR_FROM_OFFSET (next_offset)));
if (current_p->size >= required_size)
{
@ -288,7 +289,7 @@ void *jmem_heap_alloc_block_internal (const size_t size)
VALGRIND_NOACCESS_SPACE (current_p, sizeof (jmem_heap_free_t));
// Next in list
prev_p = current_p;
current_p = JMEM_HEAP_GET_ADDR_FROM_OFFSET (next_offset);
current_offset = next_offset;
}
}