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Add 32 bit compressed pointer support.

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JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2016-09-01 01:44:08 -07:00
parent 9ca78d380f
commit da47dedaed
19 changed files with 271 additions and 173 deletions
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jerry-core/jmem/jmem-heap.c
+4 -48
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@@ -145,8 +145,10 @@ static void jmem_heap_stat_free_iter ();
void
jmem_heap_init (void)
{
JERRY_STATIC_ASSERT ((1u << JMEM_HEAP_OFFSET_LOG) >= JMEM_HEAP_SIZE,
two_pow_mem_heap_offset_should_not_be_less_than_mem_heap_size);
#ifndef JERRY_CPOINTER_32_BIT
JERRY_STATIC_ASSERT (((UINT16_MAX + 1) << JMEM_ALIGNMENT_LOG) >= JMEM_HEAP_SIZE,
maximum_heap_size_for_16_bit_compressed_pointers_is_512K);
#endif /* !JERRY_CPOINTER_32_BIT */
JERRY_ASSERT ((uintptr_t) JERRY_HEAP_CONTEXT (area) % JMEM_ALIGNMENT == 0);
@@ -521,52 +523,6 @@ jmem_heap_free_block (void *ptr, /**< pointer to beginning of data space of the
JMEM_HEAP_STAT_FREE (size);
} /* jmem_heap_free_block */
/**
* Compress pointer
*
* @return packed heap pointer
*/
uintptr_t __attr_pure___ __attribute__((hot))
jmem_heap_compress_pointer (const void *pointer_p) /**< pointer to compress */
{
JERRY_ASSERT (pointer_p != NULL);
JERRY_ASSERT (jmem_is_heap_pointer (pointer_p));
uintptr_t int_ptr = (uintptr_t) pointer_p;
const uintptr_t heap_start = (uintptr_t) &JERRY_HEAP_CONTEXT (first);
JERRY_ASSERT (int_ptr % JMEM_ALIGNMENT == 0);
int_ptr -= heap_start;
int_ptr >>= JMEM_ALIGNMENT_LOG;
JERRY_ASSERT ((int_ptr & ~((1u << JMEM_HEAP_OFFSET_LOG) - 1)) == 0);
JERRY_ASSERT (int_ptr != JMEM_CP_NULL);
return int_ptr;
} /* jmem_heap_compress_pointer */
/**
* Decompress pointer
*
* @return unpacked heap pointer
*/
void * __attr_pure___ __attribute__((hot))
jmem_heap_decompress_pointer (uintptr_t compressed_pointer) /**< pointer to decompress */
{
JERRY_ASSERT (compressed_pointer != JMEM_CP_NULL);
uintptr_t int_ptr = compressed_pointer;
const uintptr_t heap_start = (uintptr_t) &JERRY_HEAP_CONTEXT (first);
int_ptr <<= JMEM_ALIGNMENT_LOG;
int_ptr += heap_start;
JERRY_ASSERT (jmem_is_heap_pointer ((void *) int_ptr));
return (void *) int_ptr;
} /* jmem_heap_decompress_pointer */
#ifndef JERRY_NDEBUG
/**
* Check whether the pointer points to the heap