From 7c174bcf4dda52a89349b45e030738057d6b554d Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 29 Apr 2017 02:58:53 +0000
Subject: node.h: sign-extend

* node.h (nd_line): should sign-extend.  shifting `VALUE` extends
  with zero bits if `sizeof(VALUE)` equals to `sizeof(int)`.  the
  zero bits are truncated if `sizeof(VALUE)` is bigger enough.
  [ruby-core:80920] [Bug #13523]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58503 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 node.h                  |  2 +-
 test/ruby/test_parse.rb | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/node.h b/node.h
index 8d2ea53c73..8fbe226a87 100644
--- a/node.h
+++ b/node.h
@@ -277,7 +277,7 @@ typedef struct RNode {
 
 #define NODE_LSHIFT (NODE_TYPESHIFT+7)
 #define NODE_LMASK  (((SIGNED_VALUE)1<<(sizeof(VALUE)*CHAR_BIT-NODE_LSHIFT))-1)
-#define nd_line(n) (int)(RNODE(n)->flags>>NODE_LSHIFT)
+#define nd_line(n) (int)(((SIGNED_VALUE)RNODE(n)->flags)>>NODE_LSHIFT)
 #define nd_set_line(n,l) \
     RNODE(n)->flags=((RNODE(n)->flags&~((VALUE)(-1)<<NODE_LSHIFT))|((VALUE)((l)&NODE_LMASK)<<NODE_LSHIFT))
 
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 09cb0cf2a5..56e1020c5a 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -978,6 +978,16 @@ x = __ENCODING__
     assert_equal(line, obj.location.lineno, bug)
   end
 
+  def test_negative_line_number
+    bug = '[ruby-core:80920] [Bug #13523]'
+    obj = Object.new
+    obj.instance_eval("def t(e = false);raise if e; __LINE__;end", "test", -100)
+    assert_equal(-100, obj.t, bug)
+    assert_equal(-100, obj.method(:t).source_location[1], bug)
+    e = assert_raise(RuntimeError) {obj.t(true)}
+    assert_equal(-100, e.backtrace_locations.first.lineno, bug)
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}
-- 
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