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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-allocator.c
+46 -4
View File
@@ -27,6 +27,14 @@
#define JMEM_ALLOCATOR_INTERNAL
#include "jmem-allocator-internal.h"
#ifdef JERRY_CPOINTER_32_BIT
/* This check will go away when we will support 64 bit compressed pointers. */
JERRY_STATIC_ASSERT (sizeof (uintptr_t) <= sizeof (jmem_cpointer_t),
size_of_uintpt_t_must_be_equal_to_jmem_cpointer_t);
#endif
/**
* Initialize memory allocators.
*/
@@ -59,12 +67,29 @@ jmem_finalize ()
*
* @return packed pointer
*/
uintptr_t
inline jmem_cpointer_t __attr_always_inline___
jmem_compress_pointer (const void *pointer_p) /**< pointer to compress */
{
JERRY_ASSERT (pointer_p != NULL);
JERRY_ASSERT (jmem_is_heap_pointer (pointer_p));
return jmem_heap_compress_pointer (pointer_p);
uintptr_t uint_ptr = (uintptr_t) pointer_p;
JERRY_ASSERT (uint_ptr % JMEM_ALIGNMENT == 0);
#ifdef JERRY_CPOINTER_32_BIT
JERRY_ASSERT (((jmem_cpointer_t) uint_ptr) == uint_ptr);
#else /* !JERRY_CPOINTER_32_BIT */
const uintptr_t heap_start = (uintptr_t) &JERRY_HEAP_CONTEXT (first);
uint_ptr -= heap_start;
uint_ptr >>= JMEM_ALIGNMENT_LOG;
JERRY_ASSERT (uint_ptr <= UINT16_MAX);
JERRY_ASSERT (uint_ptr != JMEM_CP_NULL);
#endif /* JERRY_CPOINTER_32_BIT */
return (jmem_cpointer_t) uint_ptr;
} /* jmem_compress_pointer */
/**
@@ -72,10 +97,27 @@ jmem_compress_pointer (const void *pointer_p) /**< pointer to compress */
*
* @return unpacked pointer
*/
void *
inline void * __attr_always_inline___
jmem_decompress_pointer (uintptr_t compressed_pointer) /**< pointer to decompress */
{
return jmem_heap_decompress_pointer (compressed_pointer);
JERRY_ASSERT (compressed_pointer != JMEM_CP_NULL);
uintptr_t uint_ptr = compressed_pointer;
JERRY_ASSERT (((jmem_cpointer_t) uint_ptr) == uint_ptr);
#ifdef JERRY_CPOINTER_32_BIT
JERRY_ASSERT (uint_ptr % JMEM_ALIGNMENT == 0);
#else /* !JERRY_CPOINTER_32_BIT */
const uintptr_t heap_start = (uintptr_t) &JERRY_HEAP_CONTEXT (first);
uint_ptr <<= JMEM_ALIGNMENT_LOG;
uint_ptr += heap_start;
JERRY_ASSERT (jmem_is_heap_pointer ((void *) uint_ptr));
#endif /* JERRY_CPOINTER_32_BIT */
return (void *) uint_ptr;
} /* jmem_decompress_pointer */
/**