Make built-ins strict mode conforming, and support a --use-strict flag.

src/d8.js

 // Copyright 2008 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.
 
+"use strict";
+
 String.prototype.startsWith = function (str) {
   if (str.length > this.length) {
     return false;
   }
   return this.substr(0, str.length) == str;
 };
 
 function log10(num) {
   return Math.log(num)/Math.log(10);
 }
@@ skipping 31 matching lines @@
         result.push(name);
       }
     }
     current = ToInspectableObject(current.__proto__);
   }
   return result;
 }
 
 
 // Global object holding debugger related constants and state.
-const Debug = {};
+var Debug = {};
 
 
 // Debug events which can occour in the V8 JavaScript engine. These originate
 // from the API include file v8-debug.h.
 Debug.DebugEvent = { Break: 1,
                      Exception: 2,
                      NewFunction: 3,
                      BeforeCompile: 4,
                      AfterCompile: 5 };
 
@@ skipping 14 matching lines @@
 // The different types of scopes matching constants runtime.cc.
 Debug.ScopeType = { Global: 0,
                     Local: 1,
                     With: 2,
                     Closure: 3,
                     Catch: 4,
                     Block: 5 };
 
 
 // Current debug state.
-const kNoFrame = -1;
+var kNoFrame = -1;
 Debug.State = {
   currentFrame: kNoFrame,
   displaySourceStartLine: -1,
   displaySourceEndLine: -1,
   currentSourceLine: -1
 };
 var trace_compile = false;  // Tracing all compile events?
 var trace_debug_json = false; // Tracing all debug json packets?
 var last_cmd_line = '';
 //var lol_is_enabled;  // Set to true in d8.cc if LIVE_OBJECT_LIST is defined.
 var lol_next_dump_index = 0;
-const kDefaultLolLinesToPrintAtATime = 10;
-const kMaxLolLinesToPrintAtATime = 1000;
+var kDefaultLolLinesToPrintAtATime = 10;
+var kMaxLolLinesToPrintAtATime = 1000;
 var repeat_cmd_line = '';
 var is_running = true;
 
 // Copied from debug-delay.js.  This is needed below:
 function ScriptTypeFlag(type) {
   return (1 << type);
 }
 
 
 // Process a debugger JSON message into a display text and a running status.
@@ skipping 2484 matching lines @@
 }
 
 
 function NumberToJSON_(value) {
   return String(value);
 }
 
 
 // Mapping of some control characters to avoid the \uXXXX syntax for most
 // commonly used control cahracters.
-const ctrlCharMap_ = {
+var ctrlCharMap_ = {
   '\b': '\\b',
   '\t': '\\t',
   '\n': '\\n',
   '\f': '\\f',
   '\r': '\\r',
   '"' : '\\"',
   '\\': '\\\\'
 };
 
 
 // Regular expression testing for ", \ and control characters (0x00 - 0x1F).
-const ctrlCharTest_ = new RegExp('["\\\\\x00-\x1F]');
+var ctrlCharTest_ = new RegExp('["\\\\\x00-\x1F]');
 
 
 // Regular expression matching ", \ and control characters (0x00 - 0x1F)
 // globally.
-const ctrlCharMatch_ = new RegExp('["\\\\\x00-\x1F]', 'g');
+var ctrlCharMatch_ = new RegExp('["\\\\\x00-\x1F]', 'g');
 
 
 /**
  * Convert a String to its JSON representation (see http://www.json.org/). To
  * avoid depending on the String object this method calls the functions in
  * string.js directly and not through the value.
  * @param {String} value The String value to format as JSON
  * @return {string} JSON formatted String value
  */
 function StringToJSON_(value) {
@@ skipping 21 matching lines @@
 
 
 /**
  * Convert a Date to ISO 8601 format. To avoid depending on the Date object
  * this method calls the functions in date.js directly and not through the
  * value.
  * @param {Date} value The Date value to format as JSON
  * @return {string} JSON formatted Date value
  */
 function DateToISO8601_(value) {
-  function f(n) {
+  var f = function(n) {
     return n < 10 ? '0' + n : n;
-  }
-  function g(n) {
+  };
+  var g = function(n) {
     return n < 10 ? '00' + n : n < 100 ? '0' + n : n;
-  }
+  };
   return builtins.GetUTCFullYearFrom(value)         + '-' +
           f(builtins.GetUTCMonthFrom(value) + 1)    + '-' +
           f(builtins.GetUTCDateFrom(value))         + 'T' +
           f(builtins.GetUTCHoursFrom(value))        + ':' +
           f(builtins.GetUTCMinutesFrom(value))      + ':' +
           f(builtins.GetUTCSecondsFrom(value))      + '.' +
           g(builtins.GetUTCMillisecondsFrom(value)) + 'Z';
 }
 
 
@@ skipping 94 matching lines @@
       json += NumberToJSON_(elem);
     } else if (typeof(elem) === 'string')  {
       json += StringToJSON_(elem);
     } else {
       json += elem;
     }
   }
   json += ']';
   return json;
 }