12be40ae6b
[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>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
#ifndef RUBY_VM_OPTS_H/*-*-c-*-*/
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#define RUBY_VM_OPTS_H
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/**********************************************************************
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vm_opts.h - VM optimize option
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$Author$
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Copyright (C) 2004-2007 Koichi Sasada
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**********************************************************************/
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/* Compile options.
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* You can change these options at runtime by VM::CompileOption.
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* Following definitions are default values.
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*/
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#define OPT_TAILCALL_OPTIMIZATION 0
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#define OPT_PEEPHOLE_OPTIMIZATION 1
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#define OPT_SPECIALISED_INSTRUCTION 1
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#define OPT_INLINE_CONST_CACHE 1
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#define OPT_FROZEN_STRING_LITERAL -1
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#define OPT_DEBUG_FROZEN_STRING_LITERAL 0
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/* Build Options.
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* You can't change these options at runtime.
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*/
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/* C compiler dependent */
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/*
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* 0: direct (using labeled goto using GCC special)
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* 1: token (switch/case)
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* 2: call (function call for each insn dispatch)
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*/
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#ifndef OPT_THREADED_CODE
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#define OPT_THREADED_CODE 0
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#endif
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#define OPT_DIRECT_THREADED_CODE (OPT_THREADED_CODE == 0)
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#define OPT_TOKEN_THREADED_CODE (OPT_THREADED_CODE == 1)
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#define OPT_CALL_THREADED_CODE (OPT_THREADED_CODE == 2)
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/* VM running option */
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#define OPT_CHECKED_RUN 1
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#define OPT_INLINE_METHOD_CACHE 1
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#define OPT_GLOBAL_METHOD_CACHE 1
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#ifndef OPT_IC_FOR_IVAR
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#define OPT_IC_FOR_IVAR 1
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#endif
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/* architecture independent, affects generated code */
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#define OPT_OPERANDS_UNIFICATION 1
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#define OPT_INSTRUCTIONS_UNIFICATION 0
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#define OPT_UNIFY_ALL_COMBINATION 0
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/* misc */
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#ifndef OPT_SUPPORT_JOKE
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#define OPT_SUPPORT_JOKE 0
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#endif
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#ifndef VM_COLLECT_USAGE_DETAILS
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#define VM_COLLECT_USAGE_DETAILS 0
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#endif
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#endif /* RUBY_VM_OPTS_H */
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