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string.c: Add some comments about STR flags

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This commit is contained in:
Yusuke Endoh 2021-10-29 01:57:29 +09:00
parent c75df796d8
commit acb2f86caa
1 changed files with 7 additions and 3 deletions
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10
string.c
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@ -89,12 +89,16 @@ VALUE rb_cSymbol;
* other strings that rely on this string's buffer)
* 6: STR_BORROWED (when RSTRING_NOEMBED==1 && klass==0, unsafe to recycle
* early, specific to rb_str_tmp_frozen_{acquire,release})
* 7: STR_TMPLOCK
* 7: STR_TMPLOCK (set when a pointer to the buffer is passed to syscall
* such as read(2). Any modification and realloc is prohibited)
*
* 8-9: ENC_CODERANGE (2 bits)
* 10-16: ENCODING (7 bits == 128)
* 17: RSTRING_FSTR
* 18: STR_NOFREE
* 19: STR_FAKESTR
* 18: STR_NOFREE (do not free this string's buffer when a String is freed.
* used for a string object based on C string literal)
* 19: STR_FAKESTR (when RVALUE is not managed by GC. Typically, the string
* object header is temporarily allocated on C stack)
*/
#define RUBY_MAX_CHAR_LEN 16