Étienne Barrié 12be40ae6b 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>		2024-03-19 09:26:49 +01:00
..
lib	[DOC] Improve ObjectSpace#dump_XXX method docs	2023-02-19 22:32:52 +02:00
depend	Mark asan fake stacks during machine stack marking	2024-01-19 09:55:12 +11:00
extconf.rb
object_tracing.c	Merge gc.h and internal/gc.h	2023-02-09 10:32:29 -05:00
objspace.c	[DOC] Fix invalid documentation for reachable_objects_from (#10172)	2024-03-05 01:35:51 +09:00
objspace.h
objspace_dump.c	Implement chilled strings	2024-03-19 09:26:49 +01:00