First step towards asynchronous loading of sources

runtime/vm/flags.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/flags.h"
 
 #include "platform/assert.h"
 #include "vm/os.h"
 
 namespace dart {
@@ skipping 80 matching lines @@
   while (cur != NULL) {
     if (strcmp(cur->name_, name) == 0) {
       return cur;
     }
     cur = cur->next_;
   }
   return NULL;
 }
 
 
+bool Flags::IsSet(const char* name) {
+  Flag* flag = Lookup(name);
+  return (flag != NULL) &&
+         (flag->type_ == Flag::kBoolean) &&
+         (flag->bool_ptr_ != NULL) &&
+         (*flag->bool_ptr_ == true);
+}
+
+
 bool Flags::Register_bool(bool* addr,
                           const char* name,
                           bool default_value,
                           const char* comment) {
   Flag* flag = Lookup(name);
   if (flag != NULL) {
     ASSERT(flag->IsUnrecognized());
     return default_value;
   }
   flag = new Flag(name, comment, addr, Flag::kBoolean);
@@ skipping 221 matching lines @@
     }
 
     qsort(flag_array, num_flags, sizeof flag_array[0], CompareFlagNames);
 
     for (int i = 0; i < num_flags; ++i) {
       flag_array[i]->Print();
     }
     delete[] flag_array;
   }
 }  // namespace dart