third_party/WebKit/LayoutTests/fast/js/function-argument-evaluation.html

   1 <p>This page tests function calls whose argument expressions overwrite the callee.</p>
   2 <p>If the test passes, you'll see PASS messages below.
   3 </p>
   4 <pre id="console"></pre>
   5
   6 <script>
   7 function log(s)
   8 {
   9     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
  10 }
  11
  12 function shouldBe(aDescription, a, b)
  13 {
  14     if (a === b) {
  15         log("PASS: " + aDescription + " should be " + b + " and is.");
  16     } else {
  17         log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
  18     }
  19 }
  20
  21 function test1(callback, x) {
  22     try {
  23         return callback.apply(this, [ callback = x ]);
  24     } catch(e) {
  25         return e;
  26     }
  27 };
  28
  29 function test2(callback, x) {
  30     try {
  31         return callback(callback = x);
  32     } catch(e) {
  33         return e;
  34     }
  35 };
  36
  37 (function () {
  38     if (window.testRunner)
  39         testRunner.dumpAsText();
  40
  41     var callback = function callback(x) {
  42         return x;
  43     };
  44
  45     shouldBe("test1(callback, 1)", test1(callback, 1), 1);
  46     shouldBe("test2(callback, 1)", test2(callback, 1), 1);
  47 })();
  48 </script>