strict-mode.js 41.4 KB
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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

function CheckStrictMode(code, exception) {
  assertDoesNotThrow(code);
  assertThrows("'use strict';\n" + code, exception);
  assertThrows('"use strict";\n' + code, exception);
  assertDoesNotThrow("\
    function outer() {\
      function inner() {\n"
        + code +
      "\n}\
    }");
  assertThrows("\
    function outer() {\
      'use strict';\
      function inner() {\n"
        + code +
      "\n}\
    }", exception);
}

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function CheckFunctionConstructorStrictMode() {
  var args = [];
  for (var i = 0; i < arguments.length; i ++) {
    args[i] = arguments[i];
  }
  // Create non-strict function. No exception.
  args[arguments.length] = "";
  assertDoesNotThrow(function() {
    Function.apply(this, args);
  });
  // Create strict mode function. Exception expected.
  args[arguments.length] = "'use strict';";
  assertThrows(function() {
    Function.apply(this, args);
  }, SyntaxError);
}

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// Incorrect 'use strict' directive.
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(function UseStrictEscape() {
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  "use\\x20strict";
  with ({}) {};
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})();
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// Incorrectly place 'use strict' directive.
assertThrows("function foo (x) 'use strict'; {}", SyntaxError);

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// 'use strict' in non-directive position.
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(function UseStrictNonDirective() {
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  void(0);
  "use strict";
  with ({}) {};
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})();
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// Multiple directives, including "use strict".
assertThrows('\
"directive 1";\
"another directive";\
"use strict";\
"directive after strict";\
"and one more";\
with({}) {}', SyntaxError);

// 'with' disallowed in strict mode.
CheckStrictMode("with({}) {}", SyntaxError);

// Function named 'eval'.
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CheckStrictMode("function eval() {}", SyntaxError);
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// Function named 'arguments'.
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CheckStrictMode("function arguments() {}", SyntaxError);
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// Function parameter named 'eval'.
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CheckStrictMode("function foo(a, b, eval, c, d) {}", SyntaxError);
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// Function parameter named 'arguments'.
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CheckStrictMode("function foo(a, b, arguments, c, d) {}", SyntaxError);
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// Property accessor parameter named 'eval'.
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CheckStrictMode("var o = { set foo(eval) {} }", SyntaxError);
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// Property accessor parameter named 'arguments'.
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CheckStrictMode("var o = { set foo(arguments) {} }", SyntaxError);
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// Duplicate function parameter name.
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CheckStrictMode("function foo(a, b, c, d, b) {}", SyntaxError);
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// Function constructor: eval parameter name.
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CheckFunctionConstructorStrictMode("eval");
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// Function constructor: arguments parameter name.
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CheckFunctionConstructorStrictMode("arguments");
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// Function constructor: duplicate parameter name.
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CheckFunctionConstructorStrictMode("a", "b", "c", "b");
CheckFunctionConstructorStrictMode("a,b,c,b");
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// catch(eval)
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CheckStrictMode("try{}catch(eval){};", SyntaxError);
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// catch(arguments)
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CheckStrictMode("try{}catch(arguments){};", SyntaxError);
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// var eval
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CheckStrictMode("var eval;", SyntaxError);
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// var arguments
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CheckStrictMode("var arguments;", SyntaxError);
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// Strict mode applies to the function in which the directive is used..
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assertThrows('\
function foo(eval) {\
  "use strict";\
}', SyntaxError);
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// Strict mode doesn't affect the outer stop of strict code.
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(function NotStrict(eval) {
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  function Strict() {
    "use strict";
  }
  with ({}) {};
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})();
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// Octal literal
CheckStrictMode("var x = 012");
CheckStrictMode("012");
CheckStrictMode("'Hello octal\\032'");
CheckStrictMode("function octal() { return 012; }");
CheckStrictMode("function octal() { return '\\032'; }");

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(function ValidEscape() {
  "use strict";
  var x = '\0';
  var y = "\0";
})();

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// Octal before "use strict"
assertThrows('\
  function strict() {\
    "octal\\032directive";\
    "use strict";\
  }', SyntaxError);
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(function StrictModeNonDuplicate() {
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  "use strict";
  var x = { 123 : 1, "0123" : 2 };
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  var x = {
    123: 1,
    '123.00000000000000000000000000000000000000000000000000000000000000000001':
      2
  };
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})();
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// Duplicate data properties are allowed in ES6
(function StrictModeDuplicateES6() {
  'use strict';
  var x = {
    123: 1,
    123.00000000000000000000000000000000000000000000000000000000000000000001: 2
  };
  var x = { dupe : 1, nondupe: 3, dupe : 2 };
  var x = { '1234' : 1, '2345' : 2, '1234' : 3 };
  var x = { '1234' : 1, '2345' : 2, 1234 : 3 };
  var x = { 3.14 : 1, 2.71 : 2, 3.14 : 3 };
  var x = { 3.14 : 1, '3.14' : 2 };

  var x = { get foo() { }, get foo() { } };
  var x = { get foo(){}, get 'foo'(){}};
  var x = { get 12(){}, get '12'(){}};

  // Two setters
  var x = { set foo(v) { }, set foo(v) { } };
  var x = { set foo(v) { }, set 'foo'(v) { } };
  var x = { set 13(v) { }, set '13'(v) { } };

  // Setter and data
  var x = { foo: 'data', set foo(v) { } };
  var x = { set foo(v) { }, foo: 'data' };
  var x = { foo: 'data', set 'foo'(v) { } };
  var x = { set foo(v) { }, 'foo': 'data' };
  var x = { 'foo': 'data', set foo(v) { } };
  var x = { set 'foo'(v) { }, foo: 'data' };
  var x = { 'foo': 'data', set 'foo'(v) { } };
  var x = { set 'foo'(v) { }, 'foo': 'data' };
  var x = { 12: 1, set '12'(v){}};
  var x = { 12: 1, set 12(v){}};
  var x = { '12': 1, set '12'(v){}};
  var x = { '12': 1, set 12(v){}};

  // Getter and data
  var x = { foo: 'data', get foo() { } };
  var x = { get foo() { }, foo: 'data' };
  var x = { 'foo': 'data', get foo() { } };
  var x = { get 'foo'() { }, 'foo': 'data' };
  var x = { '12': 1, get '12'(){}};
  var x = { '12': 1, get 12(){}};
})();
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// Assignment to eval or arguments
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CheckStrictMode("function strict() { eval = undefined; }", SyntaxError);
CheckStrictMode("function strict() { arguments = undefined; }", SyntaxError);
CheckStrictMode("function strict() { print(eval = undefined); }", SyntaxError);
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CheckStrictMode("function strict() { print(arguments = undefined); }",
                SyntaxError);
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CheckStrictMode("function strict() { var x = eval = undefined; }", SyntaxError);
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CheckStrictMode("function strict() { var x = arguments = undefined; }",
                SyntaxError);
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// Compound assignment to eval or arguments
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CheckStrictMode("function strict() { eval *= undefined; }", SyntaxError);
CheckStrictMode("function strict() { arguments /= undefined; }", SyntaxError);
CheckStrictMode("function strict() { print(eval %= undefined); }", SyntaxError);
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CheckStrictMode("function strict() { print(arguments %= undefined); }",
                SyntaxError);
CheckStrictMode("function strict() { var x = eval += undefined; }",
                SyntaxError);
CheckStrictMode("function strict() { var x = arguments -= undefined; }",
                SyntaxError);
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CheckStrictMode("function strict() { eval <<= undefined; }", SyntaxError);
CheckStrictMode("function strict() { arguments >>= undefined; }", SyntaxError);
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CheckStrictMode("function strict() { print(eval >>>= undefined); }",
                SyntaxError);
CheckStrictMode("function strict() { print(arguments &= undefined); }",
                SyntaxError);
CheckStrictMode("function strict() { var x = eval ^= undefined; }",
                SyntaxError);
CheckStrictMode("function strict() { var x = arguments |= undefined; }",
                SyntaxError);
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// Postfix increment with eval or arguments
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CheckStrictMode("function strict() { eval++; }", SyntaxError);
CheckStrictMode("function strict() { arguments++; }", SyntaxError);
CheckStrictMode("function strict() { print(eval++); }", SyntaxError);
CheckStrictMode("function strict() { print(arguments++); }", SyntaxError);
CheckStrictMode("function strict() { var x = eval++; }", SyntaxError);
CheckStrictMode("function strict() { var x = arguments++; }", SyntaxError);
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// Postfix decrement with eval or arguments
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CheckStrictMode("function strict() { eval--; }", SyntaxError);
CheckStrictMode("function strict() { arguments--; }", SyntaxError);
CheckStrictMode("function strict() { print(eval--); }", SyntaxError);
CheckStrictMode("function strict() { print(arguments--); }", SyntaxError);
CheckStrictMode("function strict() { var x = eval--; }", SyntaxError);
CheckStrictMode("function strict() { var x = arguments--; }", SyntaxError);
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// Prefix increment with eval or arguments
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CheckStrictMode("function strict() { ++eval; }", SyntaxError);
CheckStrictMode("function strict() { ++arguments; }", SyntaxError);
CheckStrictMode("function strict() { print(++eval); }", SyntaxError);
CheckStrictMode("function strict() { print(++arguments); }", SyntaxError);
CheckStrictMode("function strict() { var x = ++eval; }", SyntaxError);
CheckStrictMode("function strict() { var x = ++arguments; }", SyntaxError);
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// Prefix decrement with eval or arguments
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CheckStrictMode("function strict() { --eval; }", SyntaxError);
CheckStrictMode("function strict() { --arguments; }", SyntaxError);
CheckStrictMode("function strict() { print(--eval); }", SyntaxError);
CheckStrictMode("function strict() { print(--arguments); }", SyntaxError);
CheckStrictMode("function strict() { var x = --eval; }", SyntaxError);
CheckStrictMode("function strict() { var x = --arguments; }", SyntaxError);
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// Delete of an unqualified identifier
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CheckStrictMode("delete unqualified;", SyntaxError);
CheckStrictMode("function strict() { delete unqualified; }", SyntaxError);
CheckStrictMode("function function_name() { delete function_name; }",
                SyntaxError);
CheckStrictMode("function strict(parameter) { delete parameter; }",
                SyntaxError);
CheckStrictMode("function strict() { var variable; delete variable; }",
                SyntaxError);
CheckStrictMode("var variable; delete variable;", SyntaxError);

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(function TestStrictDelete() {
  "use strict";
  // "delete this" is allowed in strict mode and should work.
  function strict_delete() { delete this; }
  strict_delete();
})();

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// Prefix unary operators other than delete, ++, -- are valid in strict mode
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(function StrictModeUnaryOperators() {
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  "use strict";
  var x = [void eval, typeof eval, +eval, -eval, ~eval, !eval];
  var y = [void arguments, typeof arguments,
           +arguments, -arguments, ~arguments, !arguments];
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})();
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// 7.6.1.2 Future Reserved Words in strict mode
var future_strict_reserved_words = [
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  "implements",
  "interface",
  "let",
  "package",
  "private",
  "protected",
  "public",
  "static",
  "yield" ];

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function testFutureStrictReservedWord(word) {
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  // Simple use of each reserved word
  CheckStrictMode("var " + word + " = 1;", SyntaxError);
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  CheckStrictMode("typeof (" + word + ");", SyntaxError);
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  // object literal properties
  eval("var x = { " + word + " : 42 };");
  eval("var x = { get " + word + " () {} };");
  eval("var x = { set " + word + " (value) {} };");
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  eval("var x = { get " + word + " () { 'use strict'; } };");
  eval("var x = { set " + word + " (value) { 'use strict'; } };");
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  // object literal with string literal property names
  eval("var x = { '" + word + "' : 42 };");
  eval("var x = { get '" + word + "' () { } };");
  eval("var x = { set '" + word + "' (value) { } };");
  eval("var x = { get '" + word + "' () { 'use strict'; } };");
  eval("var x = { set '" + word + "' (value) { 'use strict'; } };");

  // Function names and arguments, strict and non-strict contexts
  CheckStrictMode("function " + word + " () {}", SyntaxError);
  CheckStrictMode("function foo (" + word + ") {}", SyntaxError);
  CheckStrictMode("function foo (" + word + ", " + word + ") {}", SyntaxError);
  CheckStrictMode("function foo (a, " + word + ") {}", SyntaxError);
  CheckStrictMode("function foo (" + word + ", a) {}", SyntaxError);
  CheckStrictMode("function foo (a, " + word + ", b) {}", SyntaxError);
  CheckStrictMode("var foo = function (" + word + ") {}", SyntaxError);

  // Function names and arguments when the body is strict
  assertThrows("function " + word + " () { 'use strict'; }", SyntaxError);
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  assertThrows("function foo (" + word + ", " + word + ") { 'use strict'; }",
               SyntaxError);
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  assertThrows("function foo (a, " + word + ") { 'use strict'; }", SyntaxError);
  assertThrows("function foo (" + word + ", a) { 'use strict'; }", SyntaxError);
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  assertThrows("function foo (a, " + word + ", b) { 'use strict'; }",
               SyntaxError);
  assertThrows("var foo = function (" + word + ") { 'use strict'; }",
               SyntaxError);
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  // setter parameter when the body is strict
  CheckStrictMode("var x = { set foo(" + word + ") {} };", SyntaxError);
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  assertThrows("var x = { set foo(" + word + ") { 'use strict'; } };",
               SyntaxError);
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}

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for (var i = 0; i < future_strict_reserved_words.length; i++) {
  testFutureStrictReservedWord(future_strict_reserved_words[i]);
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}

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function testAssignToUndefined(test, should_throw) {
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  try {
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    test();
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  } catch (e) {
    assertTrue(should_throw, "strict mode");
    assertInstanceof(e, ReferenceError, "strict mode");
    return;
  }
  assertFalse(should_throw, "strict mode");
}

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function repeat(n, f) {
  for (var i = 0; i < n; i ++) { f(); }
}

function assignToUndefined() {
  "use strict";
  possibly_undefined_variable_for_strict_mode_test = "should throw?";
}

testAssignToUndefined(assignToUndefined, true);
testAssignToUndefined(assignToUndefined, true);
testAssignToUndefined(assignToUndefined, true);
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possibly_undefined_variable_for_strict_mode_test = "value";

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testAssignToUndefined(assignToUndefined, false);
testAssignToUndefined(assignToUndefined, false);
testAssignToUndefined(assignToUndefined, false);
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delete possibly_undefined_variable_for_strict_mode_test;

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testAssignToUndefined(assignToUndefined, true);
testAssignToUndefined(assignToUndefined, true);
testAssignToUndefined(assignToUndefined, true);
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repeat(10, function() { testAssignToUndefined(assignToUndefined, true); });
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possibly_undefined_variable_for_strict_mode_test = "value";
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repeat(10, function() { testAssignToUndefined(assignToUndefined, false); });
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delete possibly_undefined_variable_for_strict_mode_test;
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repeat(10, function() { testAssignToUndefined(assignToUndefined, true); });
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possibly_undefined_variable_for_strict_mode_test = undefined;
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repeat(10, function() { testAssignToUndefined(assignToUndefined, false); });

function assignToUndefinedWithEval() {
  "use strict";
  possibly_undefined_variable_for_strict_mode_test_with_eval = "should throw?";
  eval("");
}

testAssignToUndefined(assignToUndefinedWithEval, true);
testAssignToUndefined(assignToUndefinedWithEval, true);
testAssignToUndefined(assignToUndefinedWithEval, true);

possibly_undefined_variable_for_strict_mode_test_with_eval = "value";

testAssignToUndefined(assignToUndefinedWithEval, false);
testAssignToUndefined(assignToUndefinedWithEval, false);
testAssignToUndefined(assignToUndefinedWithEval, false);

delete possibly_undefined_variable_for_strict_mode_test_with_eval;

testAssignToUndefined(assignToUndefinedWithEval, true);
testAssignToUndefined(assignToUndefinedWithEval, true);
testAssignToUndefined(assignToUndefinedWithEval, true);

repeat(10, function() {
             testAssignToUndefined(assignToUndefinedWithEval, true);
           });
possibly_undefined_variable_for_strict_mode_test_with_eval = "value";
repeat(10, function() {
             testAssignToUndefined(assignToUndefinedWithEval, false);
           });
delete possibly_undefined_variable_for_strict_mode_test_with_eval;
repeat(10, function() {
             testAssignToUndefined(assignToUndefinedWithEval, true);
           });
possibly_undefined_variable_for_strict_mode_test_with_eval = undefined;
repeat(10, function() {
             testAssignToUndefined(assignToUndefinedWithEval, false);
           });


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(function testDeleteNonConfigurable() {
  function delete_property(o) {
    "use strict";
    delete o.property;
  }
  function delete_element(o, i) {
    "use strict";
    delete o[i];
  }

  var object = {};

  Object.defineProperty(object, "property", { value: "property_value" });
  Object.defineProperty(object, "1", { value: "one" });
  Object.defineProperty(object, 7, { value: "seven" });
  Object.defineProperty(object, 3.14, { value: "pi" });

  assertThrows(function() { delete_property(object); }, TypeError);
  assertEquals(object.property, "property_value");
  assertThrows(function() { delete_element(object, "1"); }, TypeError);
  assertThrows(function() { delete_element(object, 1); }, TypeError);
  assertEquals(object[1], "one");
  assertThrows(function() { delete_element(object, "7"); }, TypeError);
  assertThrows(function() { delete_element(object, 7); }, TypeError);
  assertEquals(object[7], "seven");
  assertThrows(function() { delete_element(object, "3.14"); }, TypeError);
  assertThrows(function() { delete_element(object, 3.14); }, TypeError);
  assertEquals(object[3.14], "pi");
})();
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// Not transforming this in Function.call and Function.apply.
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(function testThisTransformCallApply() {
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  function non_strict() {
    return this;
  }
  function strict() {
    "use strict";
    return this;
  }

  var global_object = (function() { return this; })();
  var object = {};

  // Non-strict call.
  assertTrue(non_strict.call(null) === global_object);
  assertTrue(non_strict.call(undefined) === global_object);
  assertEquals(typeof non_strict.call(7), "object");
  assertEquals(typeof non_strict.call("Hello"), "object");
  assertTrue(non_strict.call(object) === object);

  // Non-strict apply.
  assertTrue(non_strict.apply(null) === global_object);
  assertTrue(non_strict.apply(undefined) === global_object);
  assertEquals(typeof non_strict.apply(7), "object");
  assertEquals(typeof non_strict.apply("Hello"), "object");
  assertTrue(non_strict.apply(object) === object);

  // Strict call.
  assertTrue(strict.call(null) === null);
  assertTrue(strict.call(undefined) === undefined);
  assertEquals(typeof strict.call(7), "number");
  assertEquals(typeof strict.call("Hello"), "string");
  assertTrue(strict.call(object) === object);

  // Strict apply.
  assertTrue(strict.apply(null) === null);
  assertTrue(strict.apply(undefined) === undefined);
  assertEquals(typeof strict.apply(7), "number");
  assertEquals(typeof strict.apply("Hello"), "string");
  assertTrue(strict.apply(object) === object);
})();
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(function testThisTransform() {
  try {
    function strict() {
      "use strict";
      return typeof(this);
    }
    function nonstrict() {
      return typeof(this);
    }

    // Concat to avoid symbol.
    var strict_name = "str" + "ict";
    var nonstrict_name = "non" + "str" + "ict";
    var strict_number = 17;
    var nonstrict_number = 19;
    var strict_name_get = "str" + "ict" + "get";
    var nonstrict_name_get = "non" + "str" + "ict" + "get"
    var strict_number_get = 23;
    var nonstrict_number_get = 29;

    function install(t) {
      t.prototype.strict = strict;
      t.prototype.nonstrict = nonstrict;
      t.prototype[strict_number] = strict;
      t.prototype[nonstrict_number] = nonstrict;
      Object.defineProperty(t.prototype, strict_name_get,
                            { get: function() { return strict; },
                              configurable: true });
      Object.defineProperty(t.prototype, nonstrict_name_get,
                            { get: function() { return nonstrict; },
                              configurable: true });
      Object.defineProperty(t.prototype, strict_number_get,
                            { get: function() { return strict; },
                              configurable: true });
      Object.defineProperty(t.prototype, nonstrict_number_get,
                            { get: function() { return nonstrict; },
                              configurable: true });
    }

    function cleanup(t) {
      delete t.prototype.strict;
      delete t.prototype.nonstrict;
      delete t.prototype[strict_number];
      delete t.prototype[nonstrict_number];
      delete t.prototype[strict_name_get];
      delete t.prototype[nonstrict_name_get];
      delete t.prototype[strict_number_get];
      delete t.prototype[nonstrict_number_get];
    }

    // Set up fakes
    install(String);
    install(Number);
    install(Boolean)

    function callStrict(o) {
      return o.strict();
    }
    function callNonStrict(o) {
      return o.nonstrict();
    }
    function callKeyedStrict(o) {
      return o[strict_name]();
    }
    function callKeyedNonStrict(o) {
      return o[nonstrict_name]();
    }
    function callIndexedStrict(o) {
      return o[strict_number]();
    }
    function callIndexedNonStrict(o) {
      return o[nonstrict_number]();
    }
    function callStrictGet(o) {
      return o.strictget();
    }
    function callNonStrictGet(o) {
      return o.nonstrictget();
    }
    function callKeyedStrictGet(o) {
      return o[strict_name_get]();
    }
    function callKeyedNonStrictGet(o) {
      return o[nonstrict_name_get]();
    }
    function callIndexedStrictGet(o) {
      return o[strict_number_get]();
    }
    function callIndexedNonStrictGet(o) {
      return o[nonstrict_number_get]();
    }

    for (var i = 0; i < 10; i ++) {
      assertEquals(("hello").strict(), "string");
      assertEquals(("hello").nonstrict(), "object");
      assertEquals(("hello")[strict_name](), "string");
      assertEquals(("hello")[nonstrict_name](), "object");
      assertEquals(("hello")[strict_number](), "string");
      assertEquals(("hello")[nonstrict_number](), "object");

      assertEquals((10 + i).strict(), "number");
      assertEquals((10 + i).nonstrict(), "object");
      assertEquals((10 + i)[strict_name](), "number");
      assertEquals((10 + i)[nonstrict_name](), "object");
      assertEquals((10 + i)[strict_number](), "number");
      assertEquals((10 + i)[nonstrict_number](), "object");

      assertEquals((true).strict(), "boolean");
      assertEquals((true).nonstrict(), "object");
      assertEquals((true)[strict_name](), "boolean");
      assertEquals((true)[nonstrict_name](), "object");
      assertEquals((true)[strict_number](), "boolean");
      assertEquals((true)[nonstrict_number](), "object");

      assertEquals((false).strict(), "boolean");
      assertEquals((false).nonstrict(), "object");
      assertEquals((false)[strict_name](), "boolean");
      assertEquals((false)[nonstrict_name](), "object");
      assertEquals((false)[strict_number](), "boolean");
      assertEquals((false)[nonstrict_number](), "object");

      assertEquals(callStrict("howdy"), "string");
      assertEquals(callNonStrict("howdy"), "object");
      assertEquals(callKeyedStrict("howdy"), "string");
      assertEquals(callKeyedNonStrict("howdy"), "object");
      assertEquals(callIndexedStrict("howdy"), "string");
      assertEquals(callIndexedNonStrict("howdy"), "object");

      assertEquals(callStrict(17 + i), "number");
      assertEquals(callNonStrict(17 + i), "object");
      assertEquals(callKeyedStrict(17 + i), "number");
      assertEquals(callKeyedNonStrict(17 + i), "object");
      assertEquals(callIndexedStrict(17 + i), "number");
      assertEquals(callIndexedNonStrict(17 + i), "object");

      assertEquals(callStrict(true), "boolean");
      assertEquals(callNonStrict(true), "object");
      assertEquals(callKeyedStrict(true), "boolean");
      assertEquals(callKeyedNonStrict(true), "object");
      assertEquals(callIndexedStrict(true), "boolean");
      assertEquals(callIndexedNonStrict(true), "object");

      assertEquals(callStrict(false), "boolean");
      assertEquals(callNonStrict(false), "object");
      assertEquals(callKeyedStrict(false), "boolean");
      assertEquals(callKeyedNonStrict(false), "object");
      assertEquals(callIndexedStrict(false), "boolean");
      assertEquals(callIndexedNonStrict(false), "object");

      // All of the above, with getters
      assertEquals(("hello").strictget(), "string");
      assertEquals(("hello").nonstrictget(), "object");
      assertEquals(("hello")[strict_name_get](), "string");
      assertEquals(("hello")[nonstrict_name_get](), "object");
      assertEquals(("hello")[strict_number_get](), "string");
      assertEquals(("hello")[nonstrict_number_get](), "object");

      assertEquals((10 + i).strictget(), "number");
      assertEquals((10 + i).nonstrictget(), "object");
      assertEquals((10 + i)[strict_name_get](), "number");
      assertEquals((10 + i)[nonstrict_name_get](), "object");
      assertEquals((10 + i)[strict_number_get](), "number");
      assertEquals((10 + i)[nonstrict_number_get](), "object");

      assertEquals((true).strictget(), "boolean");
      assertEquals((true).nonstrictget(), "object");
      assertEquals((true)[strict_name_get](), "boolean");
      assertEquals((true)[nonstrict_name_get](), "object");
      assertEquals((true)[strict_number_get](), "boolean");
      assertEquals((true)[nonstrict_number_get](), "object");

      assertEquals((false).strictget(), "boolean");
      assertEquals((false).nonstrictget(), "object");
      assertEquals((false)[strict_name_get](), "boolean");
      assertEquals((false)[nonstrict_name_get](), "object");
      assertEquals((false)[strict_number_get](), "boolean");
      assertEquals((false)[nonstrict_number_get](), "object");

      assertEquals(callStrictGet("howdy"), "string");
      assertEquals(callNonStrictGet("howdy"), "object");
      assertEquals(callKeyedStrictGet("howdy"), "string");
      assertEquals(callKeyedNonStrictGet("howdy"), "object");
      assertEquals(callIndexedStrictGet("howdy"), "string");
      assertEquals(callIndexedNonStrictGet("howdy"), "object");

      assertEquals(callStrictGet(17 + i), "number");
      assertEquals(callNonStrictGet(17 + i), "object");
      assertEquals(callKeyedStrictGet(17 + i), "number");
      assertEquals(callKeyedNonStrictGet(17 + i), "object");
      assertEquals(callIndexedStrictGet(17 + i), "number");
      assertEquals(callIndexedNonStrictGet(17 + i), "object");

      assertEquals(callStrictGet(true), "boolean");
      assertEquals(callNonStrictGet(true), "object");
      assertEquals(callKeyedStrictGet(true), "boolean");
      assertEquals(callKeyedNonStrictGet(true), "object");
      assertEquals(callIndexedStrictGet(true), "boolean");
      assertEquals(callIndexedNonStrictGet(true), "object");

      assertEquals(callStrictGet(false), "boolean");
      assertEquals(callNonStrictGet(false), "object");
      assertEquals(callKeyedStrictGet(false), "boolean");
      assertEquals(callKeyedNonStrictGet(false), "object");
      assertEquals(callIndexedStrictGet(false), "boolean");
      assertEquals(callIndexedNonStrictGet(false), "object");

    }
  } finally {
    // Cleanup
    cleanup(String);
    cleanup(Number);
    cleanup(Boolean);
  }
})();
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828


(function ObjectEnvironment() {
  var o = {};
  Object.defineProperty(o, "foo", { value: "FOO", writable: false });
  assertThrows(
    function () {
      with (o) {
        (function() {
          "use strict";
          foo = "Hello";
        })();
      }
    },
    TypeError);
})();


(function TestSetPropertyWithoutSetter() {
  var o = { get foo() { return "Yey"; } };
  assertThrows(
    function broken() {
      "use strict";
      o.foo = (0xBADBAD00 >> 1);
    },
    TypeError);
})();


(function TestSetPropertyNonConfigurable() {
  var frozen = Object.freeze({});
  var sealed = Object.seal({});

  function strict(o) {
    "use strict";
    o.property = "value";
  }

  assertThrows(function() { strict(frozen); }, TypeError);
  assertThrows(function() { strict(sealed); }, TypeError);
})();


(function TestAssignmentToReadOnlyProperty() {
  "use strict";

  var o = {};
  Object.defineProperty(o, "property", { value: 7 });

  assertThrows(function() { o.property = "new value"; }, TypeError);
  assertThrows(function() { o.property += 10; }, TypeError);
  assertThrows(function() { o.property -= 10; }, TypeError);
  assertThrows(function() { o.property *= 10; }, TypeError);
  assertThrows(function() { o.property /= 10; }, TypeError);
  assertThrows(function() { o.property++; }, TypeError);
  assertThrows(function() { o.property--; }, TypeError);
  assertThrows(function() { ++o.property; }, TypeError);
  assertThrows(function() { --o.property; }, TypeError);

  var name = "prop" + "erty"; // to avoid symbol path.
  assertThrows(function() { o[name] = "new value"; }, TypeError);
  assertThrows(function() { o[name] += 10; }, TypeError);
  assertThrows(function() { o[name] -= 10; }, TypeError);
  assertThrows(function() { o[name] *= 10; }, TypeError);
  assertThrows(function() { o[name] /= 10; }, TypeError);
  assertThrows(function() { o[name]++; }, TypeError);
  assertThrows(function() { o[name]--; }, TypeError);
  assertThrows(function() { ++o[name]; }, TypeError);
  assertThrows(function() { --o[name]; }, TypeError);

  assertEquals(o.property, 7);
})();


(function TestAssignmentToReadOnlyLoop() {
  var name = "prop" + "erty"; // to avoid symbol path.
  var o = {};
  Object.defineProperty(o, "property", { value: 7 });

  function strict(o, name) {
    "use strict";
    o[name] = "new value";
  }

  for (var i = 0; i < 10; i ++) {
829
    var exception = false;
830 831 832
    try {
      strict(o, name);
    } catch(e) {
833
      exception = true;
834 835
      assertInstanceof(e, TypeError);
    }
836
    assertTrue(exception);
837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
  }
})();


// Specialized KeyedStoreIC experiencing miss.
(function testKeyedStoreICStrict() {
  var o = [9,8,7,6,5,4,3,2,1];

  function test(o, i, v) {
    "use strict";
    o[i] = v;
  }

  for (var i = 0; i < 10; i ++) {
    test(o, 5, 17);        // start specialized for smi indices
    assertEquals(o[5], 17);
    test(o, "a", 19);
    assertEquals(o["a"], 19);
    test(o, "5", 29);
    assertEquals(o[5], 29);
    test(o, 100000, 31);
    assertEquals(o[100000], 31);
  }
})();
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976


(function TestSetElementWithoutSetter() {
  "use strict";

  var o = { };
  Object.defineProperty(o, 0, { get : function() { } });

  var zero_smi = 0;
  var zero_number = new Number(0);
  var zero_symbol = "0";
  var zero_string = "-0-".substring(1,2);

  assertThrows(function() { o[zero_smi] = "new value"; }, TypeError);
  assertThrows(function() { o[zero_number] = "new value"; }, TypeError);
  assertThrows(function() { o[zero_symbol] = "new value"; }, TypeError);
  assertThrows(function() { o[zero_string] = "new value"; }, TypeError);
})();


(function TestSetElementNonConfigurable() {
  "use strict";
  var frozen = Object.freeze({});
  var sealed = Object.seal({});

  var zero_number = 0;
  var zero_symbol = "0";
  var zero_string = "-0-".substring(1,2);

  assertThrows(function() { frozen[zero_number] = "value"; }, TypeError);
  assertThrows(function() { sealed[zero_number] = "value"; }, TypeError);
  assertThrows(function() { frozen[zero_symbol] = "value"; }, TypeError);
  assertThrows(function() { sealed[zero_symbol] = "value"; }, TypeError);
  assertThrows(function() { frozen[zero_string] = "value"; }, TypeError);
  assertThrows(function() { sealed[zero_string] = "value"; }, TypeError);
})();


(function TestAssignmentToReadOnlyElement() {
  "use strict";

  var o = {};
  Object.defineProperty(o, 7, { value: 17 });

  var seven_smi = 7;
  var seven_number = new Number(7);
  var seven_symbol = "7";
  var seven_string = "-7-".substring(1,2);

  // Index with number.
  assertThrows(function() { o[seven_smi] = "value"; }, TypeError);
  assertThrows(function() { o[seven_smi] += 10; }, TypeError);
  assertThrows(function() { o[seven_smi] -= 10; }, TypeError);
  assertThrows(function() { o[seven_smi] *= 10; }, TypeError);
  assertThrows(function() { o[seven_smi] /= 10; }, TypeError);
  assertThrows(function() { o[seven_smi]++; }, TypeError);
  assertThrows(function() { o[seven_smi]--; }, TypeError);
  assertThrows(function() { ++o[seven_smi]; }, TypeError);
  assertThrows(function() { --o[seven_smi]; }, TypeError);

  assertThrows(function() { o[seven_number] = "value"; }, TypeError);
  assertThrows(function() { o[seven_number] += 10; }, TypeError);
  assertThrows(function() { o[seven_number] -= 10; }, TypeError);
  assertThrows(function() { o[seven_number] *= 10; }, TypeError);
  assertThrows(function() { o[seven_number] /= 10; }, TypeError);
  assertThrows(function() { o[seven_number]++; }, TypeError);
  assertThrows(function() { o[seven_number]--; }, TypeError);
  assertThrows(function() { ++o[seven_number]; }, TypeError);
  assertThrows(function() { --o[seven_number]; }, TypeError);

  assertThrows(function() { o[seven_symbol] = "value"; }, TypeError);
  assertThrows(function() { o[seven_symbol] += 10; }, TypeError);
  assertThrows(function() { o[seven_symbol] -= 10; }, TypeError);
  assertThrows(function() { o[seven_symbol] *= 10; }, TypeError);
  assertThrows(function() { o[seven_symbol] /= 10; }, TypeError);
  assertThrows(function() { o[seven_symbol]++; }, TypeError);
  assertThrows(function() { o[seven_symbol]--; }, TypeError);
  assertThrows(function() { ++o[seven_symbol]; }, TypeError);
  assertThrows(function() { --o[seven_symbol]; }, TypeError);

  assertThrows(function() { o[seven_string] = "value"; }, TypeError);
  assertThrows(function() { o[seven_string] += 10; }, TypeError);
  assertThrows(function() { o[seven_string] -= 10; }, TypeError);
  assertThrows(function() { o[seven_string] *= 10; }, TypeError);
  assertThrows(function() { o[seven_string] /= 10; }, TypeError);
  assertThrows(function() { o[seven_string]++; }, TypeError);
  assertThrows(function() { o[seven_string]--; }, TypeError);
  assertThrows(function() { ++o[seven_string]; }, TypeError);
  assertThrows(function() { --o[seven_string]; }, TypeError);

  assertEquals(o[seven_number], 17);
  assertEquals(o[seven_symbol], 17);
  assertEquals(o[seven_string], 17);
})();


(function TestAssignmentToReadOnlyLoop() {
  "use strict";

  var o = {};
  Object.defineProperty(o, 7, { value: 17 });

  var seven_smi = 7;
  var seven_number = new Number(7);
  var seven_symbol = "7";
  var seven_string = "-7-".substring(1,2);

  for (var i = 0; i < 10; i ++) {
    assertThrows(function() { o[seven_smi] = "value" }, TypeError);
    assertThrows(function() { o[seven_number] = "value" }, TypeError);
    assertThrows(function() { o[seven_symbol] = "value" }, TypeError);
    assertThrows(function() { o[seven_string] = "value" }, TypeError);
  }

  assertEquals(o[7], 17);
})();
977 978 979 980 981 982 983 984 985 986 987 988 989


(function TestAssignmentToStringLength() {
  "use strict";

  var str_val = "string";
  var str_obj = new String(str_val);
  var str_cat = str_val + str_val + str_obj;

  assertThrows(function() { str_val.length = 1; }, TypeError);
  assertThrows(function() { str_obj.length = 1; }, TypeError);
  assertThrows(function() { str_cat.length = 1; }, TypeError);
})();
990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008


(function TestArgumentsAliasing() {
  function strict(a, b) {
    "use strict";
    a = "c";
    b = "d";
    return [a, b, arguments[0], arguments[1]];
  }

  function nonstrict(a, b) {
    a = "c";
    b = "d";
    return [a, b, arguments[0], arguments[1]];
  }

  assertEquals(["c", "d", "a", "b"], strict("a", "b"));
  assertEquals(["c", "d", "c", "d"], nonstrict("a", "b"));
})();
1009 1010


1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
function CheckFunctionPillDescriptor(func, name) {

  function CheckPill(pill) {
    assertEquals("function", typeof pill);
    assertInstanceof(pill, Function);
    pill.property = "value";
    assertEquals(pill.value, undefined);
    assertThrows(function() { 'use strict'; pill.property = "value"; },
                 TypeError);
    assertThrows(pill, TypeError);
    assertEquals(pill.prototype, (function(){}).prototype);
    var d = Object.getOwnPropertyDescriptor(pill, "prototype");
    assertFalse(d.writable);
    assertFalse(d.configurable);
    assertFalse(d.enumerable);
  }

  // Poisoned accessors are no longer own properties
  func = Object.getPrototypeOf(func);
  var descriptor = Object.getOwnPropertyDescriptor(func, name);
  CheckPill(descriptor.get)
  CheckPill(descriptor.set);
  assertFalse(descriptor.enumerable);
  // In ES6, restricted function properties are configurable
  assertTrue(descriptor.configurable);
}


function CheckArgumentsPillDescriptor(func, name) {
1040 1041 1042 1043

  function CheckPill(pill) {
    assertEquals("function", typeof pill);
    assertInstanceof(pill, Function);
1044 1045 1046 1047
    pill.property = "value";
    assertEquals(pill.value, undefined);
    assertThrows(function() { 'use strict'; pill.property = "value"; },
                 TypeError);
1048 1049 1050 1051 1052 1053 1054 1055
    assertThrows(pill, TypeError);
    assertEquals(pill.prototype, (function(){}).prototype);
    var d = Object.getOwnPropertyDescriptor(pill, "prototype");
    assertFalse(d.writable);
    assertFalse(d.configurable);
    assertFalse(d.enumerable);
  }

1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
  var descriptor = Object.getOwnPropertyDescriptor(func, name);
  CheckPill(descriptor.get)
  CheckPill(descriptor.set);
  assertFalse(descriptor.enumerable);
  assertFalse(descriptor.configurable);
}


(function TestStrictFunctionPills() {
  function strict() {
    "use strict";
1067
  }
1068 1069
  assertThrows(function() { strict.caller; }, TypeError);
  assertThrows(function() { strict.arguments; }, TypeError);
1070 1071
  assertThrows(function() { strict.caller = 42; }, TypeError);
  assertThrows(function() { strict.arguments = 42; }, TypeError);
1072 1073 1074 1075

  var another = new Function("'use strict'");
  assertThrows(function() { another.caller; }, TypeError);
  assertThrows(function() { another.arguments; }, TypeError);
1076 1077
  assertThrows(function() { another.caller = 42; }, TypeError);
  assertThrows(function() { another.arguments = 42; }, TypeError);
1078 1079 1080 1081

  var third = (function() { "use strict"; return function() {}; })();
  assertThrows(function() { third.caller; }, TypeError);
  assertThrows(function() { third.arguments; }, TypeError);
1082 1083
  assertThrows(function() { third.caller = 42; }, TypeError);
  assertThrows(function() { third.arguments = 42; }, TypeError);
1084

1085 1086 1087 1088 1089 1090
  CheckFunctionPillDescriptor(strict, "caller");
  CheckFunctionPillDescriptor(strict, "arguments");
  CheckFunctionPillDescriptor(another, "caller");
  CheckFunctionPillDescriptor(another, "arguments");
  CheckFunctionPillDescriptor(third, "caller");
  CheckFunctionPillDescriptor(third, "arguments");
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
})();


(function TestStrictFunctionWritablePrototype() {
  "use strict";
  function TheClass() {
  }
  assertThrows(function() { TheClass.caller; }, TypeError);
  assertThrows(function() { TheClass.arguments; }, TypeError);

  // Strict functions must have writable prototype.
  TheClass.prototype = {
    func: function() { return "func_value"; },
    get accessor() { return "accessor_value"; },
    property: "property_value",
  };

  var o = new TheClass();
  assertEquals(o.func(), "func_value");
  assertEquals(o.accessor, "accessor_value");
  assertEquals(o.property, "property_value");
})();
1113 1114 1115 1116 1117 1118 1119 1120 1121


(function TestStrictArgumentPills() {
  function strict() {
    "use strict";
    return arguments;
  }

  var args = strict();
1122 1123
  CheckArgumentsPillDescriptor(args, "caller");
  CheckArgumentsPillDescriptor(args, "callee");
1124 1125 1126 1127 1128

  args = strict(17, "value", strict);
  assertEquals(17, args[0])
  assertEquals("value", args[1])
  assertEquals(strict, args[2]);
1129 1130
  CheckArgumentsPillDescriptor(args, "caller");
  CheckArgumentsPillDescriptor(args, "callee");
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140

  function outer() {
    "use strict";
    function inner() {
      return arguments;
    }
    return inner;
  }

  var args = outer()();
1141 1142
  CheckArgumentsPillDescriptor(args, "caller");
  CheckArgumentsPillDescriptor(args, "callee");
1143 1144 1145 1146 1147

  args = outer()(17, "value", strict);
  assertEquals(17, args[0])
  assertEquals("value", args[1])
  assertEquals(strict, args[2]);
1148 1149
  CheckArgumentsPillDescriptor(args, "caller");
  CheckArgumentsPillDescriptor(args, "callee");
1150
})();
1151 1152 1153 1154 1155 1156 1157 1158 1159


(function TestNonStrictFunctionCallerPillSimple() {
  function return_my_caller() {
    return return_my_caller.caller;
  }

  function strict() {
    "use strict";
1160
    return return_my_caller();
1161
  }
1162
  assertSame(null, strict());
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173

  function non_strict() {
    return return_my_caller();
  }
  assertSame(non_strict(), non_strict);
})();


(function TestNonStrictFunctionCallerPill() {
  function strict(n) {
    "use strict";
1174
    return non_strict(n);
1175 1176 1177 1178
  }

  function recurse(n, then) {
    if (n > 0) {
1179
      return recurse(n - 1, then);
1180 1181 1182 1183 1184 1185
    } else {
      return then();
    }
  }

  function non_strict(n) {
1186
    return recurse(n, function() { return non_strict.caller; });
1187 1188 1189
  }

  function test(n) {
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
    return recurse(n, function() { return strict(n); });
  }

  for (var i = 0; i < 10; i ++) {
    assertSame(null, test(i));
  }
})();


(function TestNonStrictFunctionCallerDescriptorPill() {
  function strict(n) {
    "use strict";
    return non_strict(n);
  }

  function recurse(n, then) {
    if (n > 0) {
      return recurse(n - 1, then);
    } else {
      return then();
1210
    }
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
  }

  function non_strict(n) {
    return recurse(n, function() {
      return Object.getOwnPropertyDescriptor(non_strict, "caller").value;
    });
  }

  function test(n) {
    return recurse(n, function() { return strict(n); });
1221 1222 1223
  }

  for (var i = 0; i < 10; i ++) {
1224
    assertSame(null, test(i));
1225 1226
  }
})();
1227 1228 1229 1230 1231 1232 1233


(function TestStrictModeEval() {
  "use strict";
  eval("var eval_local = 10;");
  assertThrows(function() { return eval_local; }, ReferenceError);
})();