* vm_eval.c: Fix symbol leak with non optimized +send+ and method_missing [#10828]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_symbol.rb

@@ -274,4 +274,33 @@ class TestSymbol < Test::Unit::TestCase
       10.times { |i| x.send "send should not leak #{i} - sym mm".to_sym }
     end
   end
+
+  def test_symbol_send_leak_string_no_optimization
+    assert_no_immortal_symbol_created do
+      10.times { 42.method(:send).call "send should not leak #{i} - str slow" rescue nil }
+    end
+  end
+
+  def test_symbol_send_leak_symbol_no_optimization
+    assert_no_immortal_symbol_created do
+      10.times { 42.method(:send).call "send should not leak #{i} - sym slow".to_sym rescue nil }
+    end
+  end
+
+  def test_symbol_send_leak_string_custom_method_missing_no_optimization
+    x = Object.new
+    def x.method_missing(*); end
+    assert_no_immortal_symbol_created do
+      10.times { |i| x.method(:send).call "send should not leak #{i} - str mm slow" }
+    end
+  end
+
+  def test_symbol_send_leak_symbol_custom_method_missing_no_optimization
+    x = Object.new
+    def x.method_missing(*); end
+    assert_no_immortal_symbol_created do
+      10.times { |i| x.method(:send).call "send should not leak #{i} - sym mm slow".to_sym }
+    end
+  end
+
 end

vm_eval.c

@@ -884,16 +884,18 @@ send_internal(int argc, const VALUE *argv, VALUE recv, call_type scope)
 	rb_raise(rb_eArgError, "no method name given");
     }
 
-    vid = *argv++; argc--;
+    vid = *argv;
 
     id = rb_check_id(&vid);
     if (!id) {
 	if (rb_method_basic_definition_p(CLASS_OF(recv), idMethodMissing)) {
 	    VALUE exc = make_no_method_exception(rb_eNoMethodError, NULL,
-						 recv, ++argc, --argv);
+						 recv, argc, argv);
 	    rb_exc_raise(exc);
 	}
-	id = rb_to_id(vid);
+	id = idMethodMissing;
+    } else {
+	argv++; argc--;
     }
     PASS_PASSED_BLOCK_TH(th);
     return rb_call0(recv, id, argc, argv, scope, self);