Fix V8 bug 1084

test/mjsunit/strict-mode.js

 // 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
@@ skipping 132 matching lines @@
   with ({}) {};
 }
 
 // Octal literal
 CheckStrictMode("var x = 012");
 CheckStrictMode("012");
 CheckStrictMode("'Hello octal\\032'");
 CheckStrictMode("function octal() { return 012; }");
 CheckStrictMode("function octal() { return '\\032'; }");
 
+function ValidEscape() {
+  "use strict";
+  var x = '\0';
+  var y = "\0";
+}
+

[Lasse Reichstein, 2011/01/31 06:05:19]

If the preparser marks this function as lazy (which it will), the body won't be
parsed by the parser at all. In that case, even if there was a strict-mode
syntax error, I'm not sure it would be thrown.
You need to call the function to be sure that it's parsed.

(We should probably add checks to the preparser too, to ensure that we make it
an early error).

[Martin Maly, 2011/01/31 22:44:06]

Done. The pereparser work is on my todo list.

 // Octal before "use strict"
 assertThrows('\
   function strict() {\
     "octal\\032directive";\
     "use strict";\
   }', SyntaxError);
 
 // Duplicate data properties.
 CheckStrictMode("var x = { dupe : 1, nondupe: 3, dupe : 2 };", SyntaxError)
 CheckStrictMode("var x = { '1234' : 1, '2345' : 2, '1234' : 3 };", SyntaxError)
@@ skipping 95 matching lines @@
 CheckStrictMode("function strict() { var x = --eval; }", SyntaxError)
 CheckStrictMode("function strict() { var x = --arguments; }", SyntaxError)
 
 // Prefix unary operators other than delete, ++, -- are valid in strict mode
 function StrictModeUnaryOperators() {
   "use strict";
   var x = [void eval, typeof eval, +eval, -eval, ~eval, !eval];
   var y = [void arguments, typeof arguments,
            +arguments, -arguments, ~arguments, !arguments];
 }