src/v8/test/mjsunit/contextual-calls.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       with the distribution.
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var realms = [Realm.current(), Realm.create()];
globals = [Realm.global(0), Realm.global(1)];
Realm.shared = {}

function install(name, value) {
  Realm.shared[name] = value;
  for (i in realms) {
    Realm.eval(realms[i], name + " = Realm.shared['" + name + "'];");
  }
}

install('return_this', function() { return this; });
install('return_this_strict', function () { 'use strict'; return this; });

// test behaviour of 'with' scope
for (i in realms) {
  Realm.shared.results = [];
  // in the second case, 'this' is found in the with scope,
  // so the receiver is 'this'
  Realm.eval(realms[i],"                                                       \
      with('irrelevant') {                                                     \
        Realm.shared.results.push(return_this());                              \
        Realm.shared.results.push(return_this_strict());                       \
      }                                                                        \
      with(this) {                                                             \
        Realm.shared.results.push(return_this());                              \
        Realm.shared.results.push(return_this_strict());                       \
      }                                                                        \
    ");
  assertSame(globals[0], Realm.shared.results[0]);
  assertSame(undefined, Realm.shared.results[1]);
  assertSame(globals[i], Realm.shared.results[2]);
  assertSame(globals[i], Realm.shared.results[3]);
}

// test 'apply' and 'call'
for (i in realms) {
  // 'apply' without a receiver is a contextual call
  assertSame(globals[0], Realm.eval(realms[i],'return_this.apply()')) ;
  assertSame(undefined, Realm.eval(realms[i],'return_this_strict.apply()'));
  assertSame(globals[0], Realm.eval(realms[i],'return_this.apply(null)')) ;
  assertSame(null, Realm.eval(realms[i],'return_this_strict.apply(null)'));
  // 'call' without a receiver is a contextual call
  assertSame(globals[0], Realm.eval(realms[i],'return_this.call()')) ;
  assertSame(undefined, Realm.eval(realms[i],'return_this_strict.call()'));
  assertSame(globals[0], Realm.eval(realms[i],'return_this.call(null)')) ;
  assertSame(null, Realm.eval(realms[i],'return_this_strict.call(null)'));
}

// test ics
for (var i = 0; i < 4; i++) {
  assertSame(globals[0], return_this());
  assertSame(undefined, return_this_strict());
}

// BUG(1547)

Realm.eval(realms[0], "var name = 'o'");
Realm.eval(realms[1], "var name = 'i'");

install('f', function() { return this.name; });
install('g', function() { "use strict"; return this ? this.name : "u"; });

for (i in realms) {
  result = Realm.eval(realms[i], "                                             \
      (function(){return f();})() +                                            \
      (function(){return (1,f)();})() +                                        \
      (function(){'use strict'; return f();})() +                              \
      (function(){'use strict'; return (1,f)();})() +                          \
      (function(){return g();})() +                                            \
      (function(){return (1,g)();})() +                                        \
      (function(){'use strict'; return g();})() +                              \
      (function(){'use strict'; return (1,g)();})();                           \
    ");
  assertSame("oooouuuu", result);
}