diff options
| author | Peter Zhu <[email protected]> | 2024-08-08 15:03:40 -0400 |
|---|---|---|
| committer | Peter Zhu <[email protected]> | 2024-08-14 10:51:02 -0400 |
| commit | 264175dbb9e9f3c6721b1a4e28fd6cc379fda372 (patch) | |
| tree | a6120b5b421c5f49c7f6ccfb32cba46b26918ef3 | |
| parent | d0954741139e9cc4333a524570612339df3e39a1 (diff) | |
[DOC] Update comment about how object ID is calculated
The object ID no longer treats symbols in a special way so we can simplify
the comment about how it is calculated.
Notes
Notes:
Merged: https://github.com/ruby/ruby/pull/11346
| -rw-r--r-- | gc.c | 33 |
1 files changed, 4 insertions, 29 deletions
@@ -1716,35 +1716,10 @@ rb_memory_id(VALUE obj) VALUE rb_obj_id(VALUE obj) { - /* - * 32-bit VALUE space - * MSB ------------------------ LSB - * false 00000000000000000000000000000000 - * true 00000000000000000000000000000010 - * nil 00000000000000000000000000000100 - * undef 00000000000000000000000000000110 - * symbol ssssssssssssssssssssssss00001110 - * object oooooooooooooooooooooooooooooo00 = 0 (mod sizeof(RVALUE)) - * fixnum fffffffffffffffffffffffffffffff1 - * - * object_id space - * LSB - * false 00000000000000000000000000000000 - * true 00000000000000000000000000000010 - * nil 00000000000000000000000000000100 - * undef 00000000000000000000000000000110 - * symbol 000SSSSSSSSSSSSSSSSSSSSSSSSSSS0 S...S % A = 4 (S...S = s...s * A + 4) - * object oooooooooooooooooooooooooooooo0 o...o % A = 0 - * fixnum fffffffffffffffffffffffffffffff1 bignum if required - * - * where A = sizeof(RVALUE)/4 - * - * sizeof(RVALUE) is - * 20 if 32-bit, double is 4-byte aligned - * 24 if 32-bit, double is 8-byte aligned - * 40 if 64-bit - */ - + /* If obj is an immediate, the object ID is obj directly converted to a Numeric. + * Otherwise, the object ID is a Numeric that is a non-zero multiple of + * (RUBY_IMMEDIATE_MASK + 1) which guarantees that it does not collide with + * any immediates. */ return rb_find_object_id(rb_gc_get_objspace(), obj, rb_gc_impl_object_id); } |