From 2283d14cc9fefa278dfde02bdf8d84ce50cfe16f Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 20 Nov 2016 02:12:48 +0000
Subject: forwardable/impl.rb

* lib/forwardable/impl.rb (_valid_method?, _compile_method):
  extract to separate implementation specific part.
  [ruby-core:78138] [Bug #12938]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56848 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/rubyvm/lib/forwardable/impl.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 ext/rubyvm/lib/forwardable/impl.rb

(limited to 'ext/rubyvm/lib')

diff --git a/ext/rubyvm/lib/forwardable/impl.rb b/ext/rubyvm/lib/forwardable/impl.rb
new file mode 100644
index 0000000000..ddf732156a
--- /dev/null
+++ b/ext/rubyvm/lib/forwardable/impl.rb
@@ -0,0 +1,19 @@
+# :stopdoc:
+module Forwardable
+  FILTER_EXCEPTION = ""
+
+  def self._valid_method?(method)
+    iseq = RubyVM::InstructionSequence.compile("().#{method}", nil, nil, 0, false)
+  rescue SyntaxError => e
+    false
+  else
+    iseq.to_a.dig(-1, 1, 1, :mid) == method.to_sym
+  end
+
+  def self._compile_method(src, file, line)
+    RubyVM::InstructionSequence.compile(src, file, file, line,
+               trace_instruction: false,
+               tailcall_optimization: true)
+      .eval
+  end
+end
-- 
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