From 7cf523c7db67c22ffc09b38a9c5bea057f578db2 Mon Sep 17 00:00:00 2001 From: ko1 Date: Fri, 21 Aug 2015 20:47:53 +0000 Subject: * vm_opts.h, iseq.c, iseq.h: add compile option to force frozen string literals. [Feature #11473] This addition is not specification change, but to try frozen string literal world discussed on [Feature #11473]. You can try frozen string literal world using this magical line: RubyVM::InstructionSequence.compile_option = {frozen_string_literal: true} Note that this is a global compilation option, so that you need to compile another script like that: p 'foo'.frozen? #=> false RubyVM::InstructionSequence.compile_option = {frozen_string_literal: true} p 'foo'.frozen? #=> false, because this line is already compiled. p eval("'foo'.frozen?") #=> true Details: * String literals are deduped by rb_fstring(). * Dynamic string literals ("...#{xyz}...") is now only frozen, not deduped. Maybe you have other ideas. Now, please do not use this option on your productions :) Of course, current specification can be changed. * compile.c: ditto. * test/ruby/test_iseq.rb: add a test. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51659 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- iseq.h | 1 + 1 file changed, 1 insertion(+) (limited to 'iseq.h') diff --git a/iseq.h b/iseq.h index 315a73f3c7..f796905470 100644 --- a/iseq.h +++ b/iseq.h @@ -61,6 +61,7 @@ struct rb_compile_option_struct { int instructions_unification; int stack_caching; int trace_instruction; + int frozen_string_literal; int debug_level; }; -- cgit v1.2.3