test/mjsunit/global-load-from-eval.js

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// Tests global loads from eval.

var x = 27;

function test() {
  function g() {
    assertEquals(27, eval('x'));
    function h() {
      // Shadow with local variable.
      var x = 22;
      assertEquals(22, eval('x'));
      function i(x) {
        // Shadow with parameter.
        assertEquals(44, eval('x'));
        function j() {
          assertEquals(x, eval('x'));
          // Shadow with function name.
          function x() {
            assertEquals(x, eval('x'));
          }
          x();
        }
        j();
      }
      i(44);
    }
    h();
  }
  g();
}

test();

// Test loading of globals from deeply nested eval.  This code is a
// bit complicated, but the complication is needed to check that the
// code that loads the global variable accounts for the fact that the
// global variable becomes shadowed by an eval-introduced variable.
var result = 0;
function testDeep(source, load, test) {
  eval(source);
  function f() {
    var y = 23;
    function g() {
      var z = 25;
      function h() {
        eval(load);
        eval(test);
      }
      h();
    }
    g();
  }
  f();
}
testDeep('1', 'result = x', 'assertEquals(27, result)');
// Because of the eval-cache, the 'result = x' code gets reused.  This
// time in a context where the 'x' variable has been shadowed.
testDeep('var x = 1', 'result = x', 'assertEquals(1, result)');