src: fix builtin modules failing with --use-strict

Currently, lib/_tls_legacy.js and lib/crypto.js cannot be loaded when
--use-strict is passed to node. In addition to that, console.trace
throws because it uses arguments.callee.

This change fixes these issues and adds a test that makes sure
every external built-in module can be loaded with require when
--use-strict is enabled.

Please note that this change does not fix all issues with built-in
modules' code running with --use-strict. It is very likely that some
code in the built-in modules still fails when passing this flag.

However, fixing all code would require us to enable strict mode by
default in all builtins modules, which would certainly break existing
applications.

Fixes #9187.

PR: #9237
PR-URL: nodejs/node-v0.x-archive#9237
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

Author: Julien Gilli

lib/_tls_legacy.js

@@ -426,6 +426,24 @@ CryptoStream.prototype.end = function(chunk, encoding) {
   stream.Duplex.prototype.end.call(this, chunk, encoding);
 };
 
+/*
+ * Wait for both `finish` and `end` events to ensure that all data that
+ * was written on this side was read from the other side.
+ */
+function _destroyWhenReadAndWriteEndsDone(cryptoStream) {
+  var waiting = 1;
+
+  function finish() {
+    if (--waiting === 0) cryptoStream.destroy();
+  }
+
+  cryptoStream._opposite.once('end', finish);
+
+  if (!cryptoStream._finished) {
+    cryptoStream.once('finish', finish);
+    ++waiting;
+  }
+}
 
 CryptoStream.prototype.destroySoon = function(err) {
   if (this === this.pair.cleartext) {
@@ -440,18 +458,7 @@ CryptoStream.prototype.destroySoon = function(err) {
   if (this._writableState.finished && this._opposite._ended) {
     this.destroy();
   } else {
-    // Wait for both `finish` and `end` events to ensure that all data that
-    // was written on this side was read from the other side.
-    var self = this;
-    var waiting = 1;
-    function finish() {
-      if (--waiting === 0) self.destroy();
-    }
-    this._opposite.once('end', finish);
-    if (!this._finished) {
-      this.once('finish', finish);
-      ++waiting;
-    }
+    _destroyWhenReadAndWriteEndsDone(this);
   }
 };
 

lib/console.js

@@ -89,13 +89,13 @@ Console.prototype.timeEnd = function(label) {
 };
 
 
-Console.prototype.trace = function() {
+Console.prototype.trace = function trace() {
   // TODO probably can to do this better with V8's debug object once that is
   // exposed.
   var err = new Error;
   err.name = 'Trace';
   err.message = util.format.apply(this, arguments);
-  Error.captureStackTrace(err, arguments.callee);
+  Error.captureStackTrace(err, trace);
   this.error(err.stack);
 };
 

lib/crypto.js

@@ -592,20 +592,22 @@ exports.pbkdf2Sync = function(password, salt, iterations, keylen, digest) {
 
 
 function pbkdf2(password, salt, iterations, keylen, digest, callback) {
+  var encoding = exports.DEFAULT_ENCODING;
+
+  function next(er, ret) {
+    if (ret)
+      ret = ret.toString(encoding);
+    callback(er, ret);
+  }
+
   password = toBuf(password);
   salt = toBuf(salt);
 
-  if (exports.DEFAULT_ENCODING === 'buffer')
+  if (encoding === 'buffer')
     return binding.PBKDF2(password, salt, iterations, keylen, digest, callback);
 
   // at this point, we need to handle encodings.
-  var encoding = exports.DEFAULT_ENCODING;
   if (callback) {
-    function next(er, ret) {
-      if (ret)
-        ret = ret.toString(encoding);
-      callback(er, ret);
-    }
     binding.PBKDF2(password, salt, iterations, keylen, digest, next);
   } else {
     var ret = binding.PBKDF2(password, salt, iterations, keylen, digest);

test/simple/test-use-strict-builtin-modules.js

@@ -0,0 +1,34 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+/*
+ * This test makes sure that every builtin module can be loaded
+ * when the V8's --use-strict command line option is passed to node.
+ */
+
+var child_process = require('child_process');
+
+if (process.argv[2] !== 'child') {
+  child_process.fork(__filename, ['child'], { execArgv: ['--use-strict']});
+} else {
+  var natives = process.binding('natives');
+  Object.keys(natives).forEach(require);
+}