Differences From Artifact [3ba8d16fba]:
- File src/runtime/tagged-pointer.m — part of check-in [577564693c] at 2020-06-29 23:24:20 on branch tagged-pointers — lookup-asm-x86_64-elf.S: Support tagged pointers (user: js, size: 1807) [annotate] [blame] [check-ins using]
To Artifact [1f64e311ce]:
- File
src/runtime/tagged-pointer.m
— part of check-in
[943cf97843]
at
2020-07-04 00:24:54
on branch tagged-pointers
— Only use 4 bits to classify tagged pointers
This leaves 28/60 bits for the value. (user: js, size: 1915) [annotate] [blame] [check-ins using]
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15 16 17 18 19 20 21 | * file. */ #import "ObjFWRT.h" #import "private.h" | > | | 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 |
* file.
*/
#import "ObjFWRT.h"
#import "private.h"
#define TAGGED_POINTER_BITS 4
#define NUM_TAGGED_POINTER_CLASSES (1 << (TAGGED_POINTER_BITS - 1))
Class objc_tagged_pointer_classes[NUM_TAGGED_POINTER_CLASSES];
static uint_fast8_t taggedPointerClassesCount;
int_fast8_t
objc_registerTaggedPointerClass(Class class)
{
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45 46 47 48 49 50 51 |
}
Class
object_getTaggedPointerClass(id object)
{
uintptr_t pointer = (uintptr_t)object;
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}
Class
object_getTaggedPointerClass(id object)
{
uintptr_t pointer = (uintptr_t)object;
pointer &= (1 << TAGGED_POINTER_BITS) - 1;
pointer >>= 1;
if (pointer >= NUM_TAGGED_POINTER_CLASSES)
return Nil;
return objc_tagged_pointer_classes[pointer];
}
uintptr_t
object_getTaggedPointerValue(id object)
{
uintptr_t pointer = (uintptr_t)object;
pointer >>= TAGGED_POINTER_BITS;
return pointer;
}
id
objc_createTaggedPointer(uint_fast8_t class, uintptr_t value)
{
uintptr_t pointer;
if (class >= NUM_TAGGED_POINTER_CLASSES)
return nil;
if (value > (UINTPTR_MAX >> TAGGED_POINTER_BITS))
return nil;
pointer = (class << 1) | 1;
pointer |= (value << TAGGED_POINTER_BITS);
return (id)pointer;
}
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