v8/test/mjsunit/value-wrapper-accessor.js

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// When calling user-defined accessors on strings, booleans or
// numbers, we should create a wrapper object in sloppy mode.

// Flags: --allow-natives-syntax

function test(object, prototype) {
  var result;
  Object.defineProperty(prototype, "nonstrict", {
    get: function() { result = this; },
    set: function(v) { result = this; }
  });
  Object.defineProperty(prototype, "strict", {
    get: function() { "use strict"; result = this; },
    set: function(v) { "use strict"; result = this; }
  });

  (function() {
    function nonstrict(s) {
      return s.nonstrict;
    }
    function strict(s) {
      return s.strict;
    }

    nonstrict(object);
    nonstrict(object);
    %OptimizeFunctionOnNextCall(nonstrict);
    result = undefined;
    nonstrict(object);
    assertEquals("object", typeof result);

    strict(object);
    strict(object);
    %OptimizeFunctionOnNextCall(strict);
    result = undefined;
    strict(object);
    assertEquals(typeof object, typeof result);
  })();

  (function() {
    function nonstrict(s) {
      return s.nonstrict = 10;
    }
    function strict(s) {
      return s.strict = 10;
    }

    nonstrict(object);
    nonstrict(object);
    %OptimizeFunctionOnNextCall(nonstrict);
    result = undefined;
    nonstrict(object);
    assertEquals("object", typeof result);

    strict(object);
    strict(object);
    %OptimizeFunctionOnNextCall(strict);
    result = undefined;
    strict(object);
    assertEquals(object, result);
  })();
}

test(1, Number.prototype);
test("string", String.prototype);
test(true, Boolean.prototype);