* thread.c (update_coverage): skip coverage count up if the current

line is out of the way.  rb_sourceline() is unreliable when source
  code is big.  [ruby-dev:44413]

* test/coverage/test_coverage.rb: add a test for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/coverage/test_coverage.rb

@@ -31,10 +31,31 @@ class TestCoverage < Test::Unit::TestCase
 
         Coverage.start
         require tmp + '/test.rb'
-        Coverage.result
+        assert_equal 3, Coverage.result[tmp + '/test.rb'].size
         Coverage.start
         coverage_test_method
-        assert_equal 1, Coverage.result.size
+        assert_equal 0, Coverage.result[tmp + '/test.rb'].size
+      }
+    }
+  ensure
+    $".replace loaded_features
+  end
+
+  def test_big_code
+    loaded_features = $".dup
+
+    Dir.mktmpdir {|tmp|
+      Dir.chdir(tmp) {
+        File.open("test.rb", "w") do |f|
+          f.puts "p\n" * 10000
+          f.puts "def ignore(x); end"
+          f.puts "ignore([1"
+          f.puts "])"
+        end
+
+        Coverage.start
+        require tmp + '/test.rb'
+        assert_equal 10003, Coverage.result[tmp + '/test.rb'].size
       }
     }
   ensure