bigdecimal.c: wrapper object before alloc

* ext/bigdecimal/bigdecimal.c (VpNewRbClass): make wrapper object
  before result structs allocation and manage refcount for each
  elements to get rid of potential memory leak.

* ext/bigdecimal/bigdecimal.c (BigDecimal_global_new): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50650 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 27 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 042d11da0f..ad48d70799 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -1552,4 +1552,31 @@ class TestBigDecimal < Test::Unit::TestCase
     Thread.current.keys.to_s
     EOS
   end
+
+  def assert_no_memory_leak(code, *rest, **opt)
+    code = "5.times {1_000.times {begin #{code}; rescue NoMemoryError; end; GC.start}} if b"
+    super(["-rbigdecimal"],
+          "b = BigDecimal('10'); b.nil?; " \
+          "GC.add_stress_to_class(BigDecimal); "\
+          "#{code}", code, *rest, rss: true, **opt)
+  end
+
+  if EnvUtil.gc_stress_to_class?
+    def test_no_memory_leak_allocate
+      assert_no_memory_leak("BigDecimal.allocate")
+    end
+
+    def test_no_memory_leak_initialize
+      assert_no_memory_leak("BigDecimal.new")
+    end
+
+    def test_no_memory_leak_global_new
+      assert_no_memory_leak("BigDecimal('10')")
+      assert_no_memory_leak("BigDecimal(b)")
+    end
+
+    def test_no_memory_leak_create
+      assert_no_memory_leak("b + 10")
+    end
+  end
 end