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author | Étienne Barrié <etienne.barrie@gmail.com> | 2023-12-01 11:33:00 +0100 |
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committer | Jean Boussier <jean.boussier@gmail.com> | 2024-03-19 09:26:49 +0100 |
commit | 12be40ae6be78ac41e8e3f3c313cc6f63e7fa6c4 (patch) | |
tree | f6b81fac770da6b705557623224dbf9b9c2d2847 /include/ruby/internal/intern | |
parent | 86b15316a748a579dd4fd4df42b6db42accebdc2 (diff) | |
download | ruby-12be40ae6be78ac41e8e3f3c313cc6f63e7fa6c4.tar.gz |
Implement chilled strings
[Feature #20205]
As a path toward enabling frozen string literals by default in the future,
this commit introduce "chilled strings". From a user perspective chilled
strings pretend to be frozen, but on the first attempt to mutate them,
they lose their frozen status and emit a warning rather than to raise a
`FrozenError`.
Implementation wise, `rb_compile_option_struct.frozen_string_literal` is
no longer a boolean but a tri-state of `enabled/disabled/unset`.
When code is compiled with frozen string literals neither explictly enabled
or disabled, string literals are compiled with a new `putchilledstring`
instruction. This instruction is identical to `putstring` except it marks
the String with the `STR_CHILLED (FL_USER3)` and `FL_FREEZE` flags.
Chilled strings have the `FL_FREEZE` flag as to minimize the need to check
for chilled strings across the codebase, and to improve compatibility with
C extensions.
Notes:
- `String#freeze`: clears the chilled flag.
- `String#-@`: acts as if the string was mutable.
- `String#+@`: acts as if the string was mutable.
- `String#clone`: copies the chilled flag.
Co-authored-by: Jean Boussier <byroot@ruby-lang.org>
Diffstat (limited to 'include/ruby/internal/intern')
-rw-r--r-- | include/ruby/internal/intern/error.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/ruby/internal/intern/error.h b/include/ruby/internal/intern/error.h index bf8daadd3e..11e147a121 100644 --- a/include/ruby/internal/intern/error.h +++ b/include/ruby/internal/intern/error.h @@ -190,7 +190,6 @@ RBIMPL_ATTR_NONNULL(()) */ void rb_error_frozen(const char *what); -RBIMPL_ATTR_NORETURN() /** * Identical to rb_error_frozen(), except it takes arbitrary Ruby object * instead of C's string. |