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Add new type which represents pointer with tag value (#3591)

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jmem_cpointer_tag_t is newly added to represent pointer along with tag value.
This new type is first applied to scope_cp to mark initailized function properties (length, name) later

JerryScript-DCO-1.0-Signed-off-by: HyukWoo Park hyukwoo.park@samsung.com
This commit is contained in:
Hyukwoo Park
2020-03-02 23:59:55 +09:00
committed by GitHub
parent 19c61e14c0
commit 34edf53753
8 changed files with 135 additions and 24 deletions
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jerry-core/jmem/jmem.h
+74
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@@ -40,6 +40,37 @@
*/
#define JMEM_ALIGNMENT (1u << JMEM_ALIGNMENT_LOG)
/**
* Pointer value can be directly stored without compression
*/
#if UINTPTR_MAX <= UINT32_MAX
#define JMEM_CAN_STORE_POINTER_VALUE_DIRECTLY
#endif /* UINTPTR_MAX <= UINT32_MAX */
/**
* Mask for tag part in jmem_cpointer_tag_t
*/
#define JMEM_TAG_MASK 0x7u
/**
* Shift for tag part in jmem_cpointer_tag_t
*/
#if defined (JMEM_CAN_STORE_POINTER_VALUE_DIRECTLY) && ENABLED (JERRY_CPOINTER_32_BIT)
#define JMEM_TAG_SHIFT 0
#else /* !JMEM_CAN_STORE_POINTER_VALUE_DIRECTLY || !ENABLED (JERRY_CPOINTER_32_BIT) */
#define JMEM_TAG_SHIFT 3
#endif /* JMEM_CAN_STORE_POINTER_VALUE_DIRECTLY && ENABLED (JERRY_CPOINTER_32_BIT) */
/**
* Bit mask for tag part in jmem_cpointer_tag_t
*/
enum
{
JMEM_FIRST_TAG_BIT_MASK = (1u << 0), /**< first tag bit mask **/
JMEM_SECOND_TAG_BIT_MASK = (1u << 1), /**< second tag bit mask **/
JMEM_THIRD_TAG_BIT_MASK = (1u << 2), /**< third tag bit mask **/
};
/**
* Compressed pointer representations
*
@@ -69,6 +100,11 @@ typedef uint32_t jmem_cpointer_t;
typedef uint16_t jmem_cpointer_t;
#endif /* ENABLED (JERRY_CPOINTER_32_BIT) */
/**
* Compressed pointer with tag value
*/
typedef uint32_t jmem_cpointer_tag_t;
/**
* Memory usage pressure for reclaiming unused memory.
*
@@ -223,6 +259,44 @@ void * JERRY_ATTR_PURE jmem_decompress_pointer (uintptr_t compressed_pointer);
} \
} while (false);
/**
* Set value of pointer-tag value so that it will correspond
* to specified non_compressed_pointer along with tag
*/
#define JMEM_CP_SET_NON_NULL_POINTER_TAG(cp_value, pointer, tag) \
do \
{ \
JERRY_ASSERT ((uintptr_t) tag < (uintptr_t) (JMEM_ALIGNMENT)); \
jmem_cpointer_tag_t compressed_ptr = jmem_compress_pointer (pointer); \
(cp_value) = (jmem_cpointer_tag_t) ((compressed_ptr << JMEM_TAG_SHIFT) | tag); \
} while (false);
/**
* Extract value of pointer from specified pointer-tag value
*/
#define JMEM_CP_GET_NON_NULL_POINTER_FROM_POINTER_TAG(type, cp_value) \
((type *) (jmem_decompress_pointer ((cp_value & ~JMEM_TAG_MASK) >> JMEM_TAG_SHIFT)))
/**
* Get value of each tag from specified pointer-tag value
*/
#define JMEM_CP_GET_FIRST_BIT_FROM_POINTER_TAG(cp_value) \
(cp_value & JMEM_FIRST_TAG_BIT_MASK) /**< get first tag bit **/
#define JMEM_CP_GET_SECOND_BIT_FROM_POINTER_TAG(cp_value) \
(cp_value & JMEM_SECOND_TAG_BIT_MASK) /**< get second tag bit **/
#define JMEM_CP_GET_THIRD_BIT_FROM_POINTER_TAG(cp_value) \
(cp_value & JMEM_THIRD_TAG_BIT_MASK) /**< get third tag bit **/
/**
* Set value of each tag to specified pointer-tag value
*/
#define JMEM_CP_SET_FIRST_BIT_TO_POINTER_TAG(cp_value) \
(cp_value) = (cp_value | JMEM_FIRST_TAG_BIT_MASK) /**< set first tag bit **/
#define JMEM_CP_SET_SECOND_BIT_TO_POINTER_TAG(cp_value) \
(cp_value) = (cp_value | JMEM_SECOND_TAG_BIT_MASK) /**< set second tag bit **/
#define JMEM_CP_SET_THIRD_BIT_TO_POINTER_TAG(cp_value) \
(cp_value) = (cp_value | JMEM_THIRD_TAG_BIT_MASK) /**< set third tag bit **/
/**
* @}
* \addtogroup poolman Memory pool manager