nodejs
diff --git a/Collapse file
‎deps/v8/src/x87/code-stubs-x87.cc‎
Copy file name to clipboardExpand all lines: deps/v8/src/x87/code-stubs-x87.cc
+5Lines changed: 5 additions & 0 deletions b/Collapse file
‎deps/v8/src/x87/code-stubs-x87.cc‎
Copy file name to clipboardExpand all lines: deps/v8/src/x87/code-stubs-x87.cc
+5Lines changed: 5 additions & 0 deletions
@@ -1835,6 +1835,11 @@ void InstanceOfStub::Generate(MacroAssembler* masm) {
   __ CmpObjectType(function, JS_FUNCTION_TYPE, function_map);
   __ j(not_equal, &slow_case);
 
+  // Go to the runtime if the function is not a constructor.
+  __ test_b(FieldOperand(function_map, Map::kBitFieldOffset),
+            static_cast<uint8_t>(1 << Map::kIsConstructor));
+  __ j(zero, &slow_case);
+
   // Ensure that {function} has an instance prototype.
   __ test_b(FieldOperand(function_map, Map::kBitFieldOffset),
             static_cast<uint8_t>(1 << Map::kHasNonInstancePrototype));