1 files changed, 163 insertions, 0 deletions
diff --git a/test/ruby/test_optimization.rb b/test/ruby/test_optimization.rb
new file mode 100644
index 0000000000..b581b7dfd3
--- /dev/null
+++ b/test/ruby/test_optimization.rb
@@ -0,0 +1,163 @@
+require 'test/unit'
+
+class TestRubyOptimization < Test::Unit::TestCase
+
+  BIGNUM_POS_MIN_32 = 1073741824      # 2 ** 30
+  if BIGNUM_POS_MIN_32.kind_of?(Fixnum)
+    FIXNUM_MAX = 4611686018427387903  # 2 ** 62 - 1
+  else
+    FIXNUM_MAX = 1073741823           # 2 ** 30 - 1
+  end
+
+  BIGNUM_NEG_MAX_32 = -1073741825     # -2 ** 30 - 1
+  if BIGNUM_NEG_MAX_32.kind_of?(Fixnum)
+    FIXNUM_MIN = -4611686018427387904 # -2 ** 62
+  else
+    FIXNUM_MIN = -1073741824          # -2 ** 30
+  end
+
+  def redefine_method(klass, method)
+    (@redefine_method_seq ||= 0)
+    seq = (@redefine_method_seq += 1)
+    eval(<<-End, ::TOPLEVEL_BINDING)
+      class #{klass}
+        alias redefine_method_orig_#{seq} #{method}
+        undef #{method}
+        def #{method}(*args)
+          args[0]
+        end
+      end
+    End
+    begin
+      return yield
+    ensure
+      eval(<<-End, ::TOPLEVEL_BINDING)
+        class #{klass}
+          undef #{method}
+          alias #{method} redefine_method_orig_#{seq}
+        end
+      End
+    end
+  end
+
+  def test_fixnum_plus
+    a, b = 1, 2
+    assert_equal 3, a + b
+    assert_instance_of Fixnum, FIXNUM_MAX
+    assert_instance_of Bignum, FIXNUM_MAX + 1
+
+    assert_equal 21, 10 + 11
+    assert_equal 11, redefine_method('Fixnum', '+') { 10 + 11 }
+    assert_equal 21, 10 + 11
+  end
+
+  def test_fixnum_minus
+    assert_equal 5, 8 - 3
+    assert_instance_of Fixnum, FIXNUM_MIN
+    assert_instance_of Bignum, FIXNUM_MIN - 1
+
+    assert_equal 5, 8 - 3
+    assert_equal 3, redefine_method('Fixnum', '-') { 8 - 3 }
+    assert_equal 5, 8 - 3
+  end
+
+  def test_fixnum_mul
+    assert_equal 15, 3 * 5
+  end
+
+  def test_fixnum_div
+    assert_equal 3, 15 / 5
+  end
+
+  def test_fixnum_mod
+    assert_equal 1, 8 % 7
+  end
+
+  def test_float_plus
+    assert_equal 4.0, 2.0 + 2.0
+    assert_equal 2.0, redefine_method('Float', '+') { 2.0 + 2.0 }
+    assert_equal 4.0, 2.0 + 2.0
+  end
+
+  def test_string_length
+    assert_equal 6, "string".length
+    assert_nil redefine_method('String', 'length') { "string".length }
+    assert_equal 6, "string".length
+  end
+
+  def test_string_plus
+    assert_equal "", "" + ""
+    assert_equal "x", "x" + ""
+    assert_equal "x", "" + "x"
+    assert_equal "ab", "a" + "b"
+    assert_equal 'b', redefine_method('String', '+') { "a" + "b" }
+    assert_equal "ab", "a" + "b"
+  end
+
+  def test_string_succ
+    assert_equal 'b', 'a'.succ
+    assert_equal 'B', 'A'.succ
+  end
+
+  def test_string_format
+    assert_equal '2', '%d' % 2
+  end
+
+  def test_array_plus
+    assert_equal [1,2], [1]+[2]
+  end
+
+  def test_array_minus
+    assert_equal [2], [1,2] - [1]
+  end
+
+  def test_array_length
+    assert_equal 0, [].length
+    assert_equal 3, [1,2,3].length
+  end
+
+  def test_hash_length
+    assert_equal 0, {}.length
+    assert_equal 1, {1=>1}.length
+  end
+
+  class MyObj
+    def ==(other)
+      true
+    end
+  end
+
+  def test_eq
+    assert_equal true, nil == nil
+    assert_equal true, 1 == 1
+    assert_equal true, 'string' == 'string'
+    assert_equal true, 1 == MyObj.new
+    assert_equal false, nil == MyObj.new
+    assert_equal true, MyObj.new == 1
+    assert_equal true, MyObj.new == nil
+  end
+
+  def test_tailcall
+    bug4082 = '[ruby-core:33289]'
+
+    option = {
+      tailcall_optimization: true,
+      trace_instruction: false,
+    }
+    iseq = RubyVM::InstructionSequence.new(<<-EOF, bug4082, __FILE__, __LINE__+1, option).eval
+      class #{self.class}::Tailcall
+        def fact_helper(n, res)
+          if n == 1
+            res
+          else
+            fact_helper(n - 1, n * res)
+          end
+        end
+        def fact(n)
+          fact_helper(n, 1)
+        end
+      end
+    EOF
+    assert_equal(9131, Tailcall.new.fact(3000).to_s.size, bug4082)
+  end
+end