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  1. JDK
  2. JDK-8160034

The `this` value in the `with` is broken by the repetition of a function call

    Details

    • Subcomponent:
    • Introduced In Version:
    • Resolved In Build:
      b130
    • CPU:
      generic
    • OS:
      generic

      Description

      FULL PRODUCT VERSION :
      java version "1.8.0_77"
      Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
      Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      Darwin Kernel Version 15.3.0

      A DESCRIPTION OF THE PROBLEM :
      The `this` value in the `with` is broken by the repetition of a function call.
      This is a code that the reproduces the problem.

      ```
      function Foo() {
        this.bar = "bar";
        this.baz = "baz";
      }

      Foo.prototype._h = function(str) {
        print("expect `bar`: " + this.bar);
      }

      Foo.prototype._e = function() {
        print("expect `baz`: " + this.baz);
      }

      function makeFunction() {
        return new Function("with(this) { return _h(_e()); }");
      }

      var fn = makeFunction();
      var foo = null;
      for (var i=0; i < 20; i++) {
        foo = new Foo();
        fn.call(foo);
      }

      // jjs sample.js
      // Output:
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: baz
      // expect `bar`: bar
      // expect `baz`: undefined
      // expect `bar`: undefined
      // expect `baz`: undefined
      // expect `bar`: undefined
      // expect `baz`: undefined
      // expect `bar`: undefined
      // expect `baz`: undefined
      // expect `bar`: undefined
      ```

      As can be seen from the reproduction code, by calling the function with the `with` statement more than 17 times , it seems the scope is broken.


      REPRODUCIBILITY :
      This bug can be reproduced always.

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            • Assignee:
              hannesw Hannes Wallnoefer
              Reporter:
              webbuggrp Webbug Group
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              • Created:
                Updated:
                Resolved: