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eo: if HAVE_EO_ID use MBS to tag Eo_Id 

a bit is taken from generation bits to tag objects references so that we
know if a Eo* is a class or an object
This commit is contained in:
Jérémy Zurcher 2013-09-26 23:12:48 +02:00 committed by Tom Hacohen
parent 5913f78b4f
commit a246e581a6
1 changed files with 7 additions and 3 deletions
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10
src/lib/eo/eo_ptr_indirection.x
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@ -57,12 +57,14 @@
* it to the fifo.
*/
/* most significant bit is kept to tag Eo_Id with 1 */
#if SIZEOF_UINTPTR_T == 4
/* 32 bits */
# define BITS_MID_TABLE_ID 5
# define BITS_TABLE_ID 5
# define BITS_ENTRY_ID 12
# define BITS_GENERATION_COUNTER 10
# define BITS_GENERATION_COUNTER 9
# define REF_TAG_SHIFT 31
# define DROPPED_TABLES 0
# define DROPPED_ENTRIES 4
typedef int16_t Table_Index;
@ -72,7 +74,8 @@ typedef uint16_t Generation_Counter;
# define BITS_MID_TABLE_ID 11
# define BITS_TABLE_ID 11
# define BITS_ENTRY_ID 12
# define BITS_GENERATION_COUNTER 30
# define BITS_GENERATION_COUNTER 29
# define REF_TAG_SHIFT 63
# define DROPPED_TABLES 2
# define DROPPED_ENTRIES 3
typedef int16_t Table_Index;
@ -236,7 +239,8 @@ extern Generation_Counter _eo_generation_counter;
/* Macro used to compose an Eo id */
#define EO_COMPOSE_PARTIAL_ID(MID_TABLE, TABLE) \
(((Eo_Id)(MID_TABLE & MASK_MID_TABLE_ID) << SHIFT_MID_TABLE_ID) | \
(((Eo_Id) 0x1 << REF_TAG_SHIFT) | \
((Eo_Id)(MID_TABLE & MASK_MID_TABLE_ID) << SHIFT_MID_TABLE_ID) | \
((Eo_Id)(TABLE & MASK_TABLE_ID) << SHIFT_TABLE_ID))
#define EO_COMPOSE_FINAL_ID(PARTIAL_ID, ENTRY, GENERATION) \