From 241dced625f9ba8a4071954579778a0940e75179 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 12 Dec 2018 05:46:13 +0000
Subject: Disable tailcall optimization [Bug #15303]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/rubyvm/lib/forwardable/impl.rb | 5 +----
 lib/forwardable.rb                 | 2 +-
 lib/forwardable/impl.rb            | 8 --------
 template/prelude.c.tmpl            | 2 +-
 4 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/ext/rubyvm/lib/forwardable/impl.rb b/ext/rubyvm/lib/forwardable/impl.rb
index e9ada26e74..e9bde2f299 100644
--- a/ext/rubyvm/lib/forwardable/impl.rb
+++ b/ext/rubyvm/lib/forwardable/impl.rb
@@ -1,7 +1,5 @@
 # :stopdoc:
 module Forwardable
-  FILTER_EXCEPTION = ""
-
   def self._valid_method?(method)
     iseq = RubyVM::InstructionSequence.compile("().#{method}", nil, nil, 0, false)
   rescue SyntaxError
@@ -12,8 +10,7 @@ module Forwardable
 
   def self._compile_method(src, file, line)
     RubyVM::InstructionSequence.compile(src, file, file, line,
-               trace_instruction: false,
-               tailcall_optimization: true)
+               trace_instruction: false)
       .eval
   end
 end
diff --git a/lib/forwardable.rb b/lib/forwardable.rb
index 7791a97b06..bcd462a97c 100644
--- a/lib/forwardable.rb
+++ b/lib/forwardable.rb
@@ -222,7 +222,7 @@ module Forwardable
           #{pre}
           begin
             #{accessor}
-          end#{method_call}#{FILTER_EXCEPTION}
+          end#{method_call}
         end
       end
     end;
diff --git a/lib/forwardable/impl.rb b/lib/forwardable/impl.rb
index 220d25aa95..58a9dfb69c 100644
--- a/lib/forwardable/impl.rb
+++ b/lib/forwardable/impl.rb
@@ -1,13 +1,5 @@
 # :stopdoc:
 module Forwardable
-  FILE_REGEXP = %r"#{Regexp.quote(File.dirname(__FILE__))}"
-  FILTER_EXCEPTION = <<-'END'
-
-        rescue ::Exception
-          $@.delete_if {|s| ::Forwardable::FILE_REGEXP =~ s} unless ::Forwardable::debug
-          ::Kernel::raise
-  END
-
   def self._valid_method?(method)
     catch {|tag|
       eval("BEGIN{throw tag}; ().#{method}", binding, __FILE__, __LINE__)
diff --git a/template/prelude.c.tmpl b/template/prelude.c.tmpl
index f642398921..aa760dc054 100644
--- a/template/prelude.c.tmpl
+++ b/template/prelude.c.tmpl
@@ -148,7 +148,7 @@ prelude_eval(VALUE code, VALUE name, int line)
     static const rb_compile_option_t optimization = {
 	TRUE, /* int inline_const_cache; */
 	TRUE, /* int peephole_optimization; */
-	TRUE, /* int tailcall_optimization; */
+	FALSE,/* int tailcall_optimization; */
 	TRUE, /* int specialized_instruction; */
 	TRUE, /* int operands_unification; */
 	TRUE, /* int instructions_unification; */
-- 
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