Add a runtime flag to control availability of dart:mirrors.

runtime/vm/parser.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/ast_transformer.h"
 #include "vm/bootstrap.h"
@@ skipping 26 matching lines @@
 
 namespace dart {
 
 DEFINE_FLAG(bool, enable_debug_break, false, "Allow use of break \"message\".");
 DEFINE_FLAG(bool, load_deferred_eagerly, false,
     "Load deferred libraries eagerly.");
 DEFINE_FLAG(bool, trace_parser, false, "Trace parser operations.");
 DEFINE_FLAG(bool, warn_mixin_typedef, true, "Warning on legacy mixin typedef.");
 DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 DECLARE_FLAG(bool, warn_on_javascript_compatibility);
-
+DEFINE_FLAG(bool, enable_mirrors, true,
+    "Disable to make importing dart:mirrors an error.");
 
 // Quick access to the current isolate and zone.
 #define I (isolate())
 #define Z (zone())
 
 
 #if defined(DEBUG)
 class TraceParser : public ValueObject {
  public:
   TraceParser(intptr_t token_pos,
@@ skipping 5718 matching lines @@
   }
 
   // Ensure that private dart:_ libraries are only imported into dart:
   // libraries, including indirectly through exports.
   const String& lib_url = String::Handle(Z, library_.url());
   if (canon_url.StartsWith(Symbols::DartSchemePrivate()) &&
       !lib_url.StartsWith(Symbols::DartScheme())) {
     ReportError(import_pos, "private library is not accessible");
   }
 
+  if (!FLAG_enable_mirrors && Symbols::DartMirrors().Equals(canon_url)) {
+    ReportError(import_pos,
+                "import of dart:mirrors with --enable-mirrors=false");
+  }
+
   if (is_import) {
     if (prefix.IsNull() || (prefix.Length() == 0)) {
       ASSERT(!is_deferred_import);
       library_.AddImport(ns);
     } else {
       LibraryPrefix& library_prefix = LibraryPrefix::Handle(Z);
       library_prefix = library_.LookupLocalLibraryPrefix(prefix);
       if (!library_prefix.IsNull()) {
         // Check that prefix names of deferred import clauses are
         // unique.
@@ skipping 7681 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart