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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.h
+35 -12
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@@ -28,10 +28,43 @@
* @{
*/
/**
* Compressed pointer representations
*
* 16 bit representation:
* The jmem_cpointer_t is defined as uint16_t
* and it can contain any sixteen bit value.
*
* 32 bit representation:
* The jmem_cpointer_t is defined as uint32_t.
* The lower JMEM_ALIGNMENT_LOG bits must be zero.
* The other bits can have any value.
*
* The 16 bit representation always encodes an offset from
* a heap base. The 32 bit representation currently encodes
* raw 32 bit JMEM_ALIGNMENT aligned pointers on 32 bit systems.
* This can be extended to encode a 32 bit offset from a heap
* base on 64 bit systems in the future. There are no plans
* to support more than 4G address space for JerryScript.
*/
/**
* Compressed pointer
*/
#ifdef JERRY_CPOINTER_32_BIT
typedef uint32_t jmem_cpointer_t;
#else /* !JERRY_CPOINTER_32_BIT */
typedef uint16_t jmem_cpointer_t;
#endif /* JERRY_CPOINTER_32_BIT */
/**
* Width of compressed memory pointer
*/
#ifdef JERRY_CPOINTER_32_BIT
#define JMEM_CP_WIDTH 32
#else /* !JERRY_CPOINTER_32_BIT */
#define JMEM_CP_WIDTH 16
#endif /* JERRY_CPOINTER_32_BIT */
/**
* Representation of NULL value for compressed pointers
@@ -43,16 +76,6 @@ typedef uint16_t jmem_cpointer_t;
*/
#define JMEM_ALIGNMENT (1u << JMEM_ALIGNMENT_LOG)
/**
* Width of compressed memory pointer
*/
#define JMEM_CP_WIDTH (JMEM_HEAP_OFFSET_LOG - JMEM_ALIGNMENT_LOG)
/**
* Compressed pointer value mask
*/
#define JMEM_CP_MASK ((1ull << JMEM_CP_WIDTH) - 1)
/**
* Severity of a 'try give memory back' request
*
@@ -107,7 +130,7 @@ typedef void (*jmem_free_unused_memory_callback_t) (jmem_free_unused_memory_seve
* to specified non_compressed_pointer
*/
#define JMEM_CP_SET_NON_NULL_POINTER(cp_value, non_compressed_pointer) \
(cp_value) = (jmem_compress_pointer (non_compressed_pointer) & JMEM_CP_MASK)
(cp_value) = jmem_compress_pointer (non_compressed_pointer)
/**
* Set value of compressed pointer so that it will correspond
@@ -131,7 +154,7 @@ typedef void (*jmem_free_unused_memory_callback_t) (jmem_free_unused_memory_seve
extern void jmem_init (void);
extern void jmem_finalize (void);
extern uintptr_t jmem_compress_pointer (const void *);
extern jmem_cpointer_t jmem_compress_pointer (const void *);
extern void *jmem_decompress_pointer (uintptr_t);
extern void jmem_register_free_unused_memory_callback (jmem_free_unused_memory_callback_t);