* compile.c (tailcallable_p): disable tail call optimization for

toplevel, eval, and load to avoid SEGV when interrupted by SIGINT.
  [ruby-core:76327] [Bug #12576]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56610 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sun Nov  6 01:39:36 2016  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* compile.c (tailcallable_p): disable tail call optimization for
+	  toplevel, eval, and load to avoid SEGV when interrupted by SIGINT.
+	  [ruby-core:76327] [Bug #12576]
+
 Sun Nov  6 01:28:41 2016  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_insnhelper.h: rename REG_(CFP|PC|SP|EP) to VM_REG_....

compile.c

@@ -2423,6 +2423,10 @@ static inline int
 tailcallable_p(rb_iseq_t *iseq)
 {
     switch (iseq->body->type) {
+      case ISEQ_TYPE_TOP:
+      case ISEQ_TYPE_EVAL:
+      case ISEQ_TYPE_MAIN:
+	/* not tail callable because cfp will be over popped */
       case ISEQ_TYPE_RESCUE:
       case ISEQ_TYPE_ENSURE:
 	/* rescue block can't tail call because of errinfo */

test/ruby/test_optimization.rb

@@ -316,6 +316,33 @@ class TestRubyOptimization < Test::Unit::TestCase
                  message(bug12565) {disasm(:add_one_and_two)})
   end
 
+  def test_tailcall_interrupted_by_sigint
+    bug = 'ruby-core:76327'
+    script = <<EOS
+RubyVM::InstructionSequence.compile_option = {
+  :tailcall_optimization => true,
+  :trace_instruction => false
+}
+
+eval <<EOF
+def foo
+  foo
+end
+foo
+EOF
+EOS
+    err = EnvUtil.invoke_ruby([], "", true, true, {}) {
+      |in_p, out_p, err_p, pid|
+      in_p.write(script)
+      in_p.close
+      sleep(1)
+      Process.kill(:SIGINT, pid)
+      Process.wait(pid)
+      err_p.read
+    }
+    assert_match(/Interrupt/, err, bug)
+  end
+
   class Bug10557
     def [](_)
       block_given?