diff options
author | ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2015-08-21 20:47:53 +0000 |
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committer | ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2015-08-21 20:47:53 +0000 |
commit | 7cf523c7db67c22ffc09b38a9c5bea057f578db2 (patch) | |
tree | 93119a59a19abdd3a1d931fc27c5828b234418e8 /iseq.c | |
parent | 42c3a67748da667cb87afd7928718c537cdd8201 (diff) |
* 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
Diffstat (limited to 'iseq.c')
-rw-r--r-- | iseq.c | 3 |
1 files changed, 3 insertions, 0 deletions
@@ -338,7 +338,9 @@ static rb_compile_option_t COMPILE_OPTION_DEFAULT = { OPT_INSTRUCTIONS_UNIFICATION, /* int instructions_unification; */ OPT_STACK_CACHING, /* int stack_caching; */ OPT_TRACE_INSTRUCTION, /* int trace_instruction */ + OPT_FROZEN_STRING_LITERAL }; + static const rb_compile_option_t COMPILE_OPTION_FALSE = {0}; static void @@ -375,6 +377,7 @@ make_compile_option(rb_compile_option_t *option, VALUE opt) SET_COMPILE_OPTION(option, opt, instructions_unification); SET_COMPILE_OPTION(option, opt, stack_caching); SET_COMPILE_OPTION(option, opt, trace_instruction); + SET_COMPILE_OPTION(option, opt, frozen_string_literal); SET_COMPILE_OPTION_NUM(option, opt, debug_level); #undef SET_COMPILE_OPTION #undef SET_COMPILE_OPTION_NUM |