YourWishes/jerryscript
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Packing ecma_object_t to 8 bytes.

Browse Source
This commit is contained in:
Ruben Ayrapetyan
2014-08-29 17:38:05 +04:00
parent 8e14f32806
commit 1d02085dc6
8 changed files with 364 additions and 180 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libecmaobjects/ecma-globals.h
+100 -74
View File
@@ -282,39 +282,6 @@ typedef struct ecma_property_t
} u;
} ecma_property_t;
/**
* Description of GC's information layout
*/
typedef struct
{
/**
* Reference counter of the object.
*
* Number of references to the object from stack variables.
*/
unsigned int refs : CONFIG_ECMA_REFERENCE_COUNTER_WIDTH;
/**
* Identifier of GC generation.
*/
unsigned int generation : 2;
/**
* Compressed pointer to next object in the global list of objects with same generation.
*/
unsigned int next_cp : ECMA_POINTER_FIELD_WIDTH;
/**
* Marker that is set if the object was visited during graph traverse.
*/
unsigned int visited : 1;
/**
* Flag indicating that the object may reference objects of younger generations in its properties.
*/
unsigned int may_ref_younger_objects : 1;
} __packed ecma_gc_info_t;
/**
* Types of lexical environments
*/
@@ -363,57 +330,116 @@ typedef enum
* Description of ECMA-object or lexical environment
* (depending on is_lexical_environment).
*/
typedef struct ecma_object_t
typedef struct
{
/** Compressed pointer to property list */
unsigned int properties_cp : ECMA_POINTER_FIELD_WIDTH;
/* Common part for objects and lexical environments */
/** Flag indicating whether it is a general object (false)
or a lexical environment (true) */
unsigned int is_lexical_environment : 1;
/**
* Compressed pointer to property list
*/
#define ECMA_OBJECT_PROPERTIES_CP_POS (0)
#define ECMA_OBJECT_PROPERTIES_CP_WIDTH (ECMA_POINTER_FIELD_WIDTH)
/**
* Attributes of either general object or lexical environment
* (depending on is_lexical_environment)
*/
union
{
/**
* A general object's attributes (if !is_lexical_environment)
*/
struct
{
/** Attribute 'Extensible' */
unsigned int extensible : 1;
/**
* Flag indicating whether it is a general object (false)
* or a lexical environment (true)
*/
#define ECMA_OBJECT_IS_LEXICAL_ENVIRONMENT_POS (ECMA_OBJECT_PROPERTIES_CP_POS + \
ECMA_OBJECT_PROPERTIES_CP_WIDTH)
#define ECMA_OBJECT_IS_LEXICAL_ENVIRONMENT_WIDTH (1)
/** Implementation internal object type (ecma_object_type_t) */
unsigned int type : 3;
/**
* Reference counter of the object, i.e. number of references
* to the object from stack variables.
*/
#define ECMA_OBJECT_GC_REFS_POS (ECMA_OBJECT_IS_LEXICAL_ENVIRONMENT_POS + \
ECMA_OBJECT_IS_LEXICAL_ENVIRONMENT_WIDTH)
#define ECMA_OBJECT_GC_REFS_WIDTH (CONFIG_ECMA_REFERENCE_COUNTER_WIDTH)
/** Compressed pointer to prototype object (ecma_object_t) */
unsigned int prototype_object_cp : ECMA_POINTER_FIELD_WIDTH;
} __packed object;
/**
* Identifier of GC generation.
*/
#define ECMA_OBJECT_GC_GENERATION_POS (ECMA_OBJECT_GC_REFS_POS + \
ECMA_OBJECT_GC_REFS_WIDTH)
#define ECMA_OBJECT_GC_GENERATION_WIDTH (2)
/**
* A lexical environment's attribute (if is_lexical_environment)
*/
struct
{
/**
* Type of lexical environment (ecma_lexical_environment_type_t).
*/
unsigned int type : 1;
/**
* Compressed pointer to next object in the global list of objects with same generation.
*/
#define ECMA_OBJECT_GC_NEXT_CP_POS (ECMA_OBJECT_GC_GENERATION_POS + \
ECMA_OBJECT_GC_GENERATION_WIDTH)
#define ECMA_OBJECT_GC_NEXT_CP_WIDTH (ECMA_POINTER_FIELD_WIDTH)
/** Compressed pointer to outer lexical environment */
unsigned int outer_reference_cp : ECMA_POINTER_FIELD_WIDTH;
} __packed lexical_environment;
/**
* Marker that is set if the object was visited during graph traverse.
*/
#define ECMA_OBJECT_GC_VISITED_POS (ECMA_OBJECT_GC_NEXT_CP_POS + \
ECMA_OBJECT_GC_NEXT_CP_WIDTH)
#define ECMA_OBJECT_GC_VISITED_WIDTH (1)
} __packed u;
/**
* Flag indicating that the object may reference objects of younger generations in its properties.
*/
#define ECMA_OBJECT_GC_MAY_REF_YOUNGER_OBJECTS_POS (ECMA_OBJECT_GC_VISITED_POS + \
ECMA_OBJECT_GC_VISITED_WIDTH)
#define ECMA_OBJECT_GC_MAY_REF_YOUNGER_OBJECTS_WIDTH (1)
/** GC's information */
ecma_gc_info_t gc_info;
FIXME(Remove aligned attribute after packing the struct)
} __packed __attribute__ ((aligned (16))) ecma_object_t;
/* Objects' only part */
/**
* Attribute 'Extensible'
*/
#define ECMA_OBJECT_OBJ_EXTENSIBLE_POS (ECMA_OBJECT_GC_MAY_REF_YOUNGER_OBJECTS_POS + \
ECMA_OBJECT_GC_MAY_REF_YOUNGER_OBJECTS_WIDTH)
#define ECMA_OBJECT_OBJ_EXTENSIBLE_WIDTH (1)
/**
* Implementation internal object type (ecma_object_type_t)
*/
#define ECMA_OBJECT_OBJ_TYPE_POS (ECMA_OBJECT_OBJ_EXTENSIBLE_POS + \
ECMA_OBJECT_OBJ_EXTENSIBLE_WIDTH)
#define ECMA_OBJECT_OBJ_TYPE_WIDTH (3)
/**
* Compressed pointer to prototype object (ecma_object_t)
*/
#define ECMA_OBJECT_OBJ_PROTOTYPE_OBJECT_CP_POS (ECMA_OBJECT_OBJ_TYPE_POS + \
ECMA_OBJECT_OBJ_TYPE_WIDTH)
#define ECMA_OBJECT_OBJ_PROTOTYPE_OBJECT_CP_WIDTH (ECMA_POINTER_FIELD_WIDTH)
/**
* Size of structure for objects
*/
#define ECMA_OBJECT_OBJ_TYPE_SIZE (ECMA_OBJECT_OBJ_PROTOTYPE_OBJECT_CP_POS + \
ECMA_OBJECT_OBJ_PROTOTYPE_OBJECT_CP_WIDTH)
/* Lexical environments' only part */
/**
* Type of lexical environment (ecma_lexical_environment_type_t).
*/
#define ECMA_OBJECT_LEX_ENV_TYPE_POS (ECMA_OBJECT_GC_MAY_REF_YOUNGER_OBJECTS_POS + \
ECMA_OBJECT_GC_MAY_REF_YOUNGER_OBJECTS_WIDTH)
#define ECMA_OBJECT_LEX_ENV_TYPE_WIDTH (1)
/**
* Compressed pointer to outer lexical environment
*/
#define ECMA_OBJECT_LEX_ENV_OUTER_REFERENCE_CP_POS (ECMA_OBJECT_LEX_ENV_TYPE_POS + \
ECMA_OBJECT_LEX_ENV_TYPE_WIDTH)
#define ECMA_OBJECT_LEX_ENV_OUTER_REFERENCE_CP_WIDTH (ECMA_POINTER_FIELD_WIDTH)
/**
* Size of structure for lexical environments
*/
#define ECMA_OBJECT_LEX_ENV_TYPE_SIZE (ECMA_OBJECT_LEX_ENV_OUTER_REFERENCE_CP_POS + \
ECMA_OBJECT_LEX_ENV_OUTER_REFERENCE_CP_WIDTH)
uint64_t container; /**< container for fields described above */
} ecma_object_t;
/**
* Description of ECMA property descriptor