VM: Separate precompilation-specific code, make flags const.

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/json_stream.h"
 #include "vm/os.h"
 
@@ skipping 23 matching lines @@
 // Nothing to be done for the product flag definitions.
 #define RELEASE_FLAG_MARCO(name, product_value, type, default_value, comment)
 #else  // defined(PRODUCT)
 #define RELEASE_FLAG_MARCO(name, product_value, type, default_value, comment)  \
   type FLAG_##name = Flags::Register_##type(&FLAG_##name,                      \
                                             #name,                             \
                                             default_value,                     \
                                             comment);
 #endif  // defined(PRODUCT)
 
+#if defined(DART_PRECOMPILED_RUNTIME)
+// Nothing to be done for the product flag definitions.
+#define PRECOMPILE_FLAG_MARCO(name, product_value, type, default_value, comment)
+#else  // defined(DART_PRECOMPILED_RUNTIME)
+#define PRECOMPILE_FLAG_MARCO(name, product_value, type, default_value,        \
+                              comment)                                         \
+  type FLAG_##name = Flags::Register_##type(&FLAG_##name,                      \
+                                            #name,                             \
+                                            default_value,                     \
+                                            comment);
+#endif  // defined(DART_PRECOMPILED_RUNTIME)
+
 // Define all of the non-product flags here.
-FLAG_LIST(PRODUCT_FLAG_MARCO, RELEASE_FLAG_MARCO, DEBUG_FLAG_MARCO)
+FLAG_LIST(PRODUCT_FLAG_MARCO,
+          RELEASE_FLAG_MARCO,
+          DEBUG_FLAG_MARCO,
+          PRECOMPILE_FLAG_MARCO)
 
 #undef RELEASE_FLAG_MARCO
 #undef DEBUG_FLAG_MARCO
 #undef PRODUCT_FLAG_MARCO
-
+#undef PRECOMPILE_FLAG_MARCO
 
 bool Flags::initialized_ = false;
 
 // List of registered flags.
 Flag** Flags::flags_ = NULL;
 intptr_t Flags::capacity_ = 0;
 intptr_t Flags::num_flags_ = 0;
 
 class Flag {
  public:
@@ skipping 444 matching lines @@
   }
   JSONObject jsobj(js);
   jsobj.AddProperty("type", "FlagList");
   JSONArray jsarr(&jsobj, "flags");
   for (intptr_t i = 0; i < num_flags_; ++i) {
     PrintFlagToJSONArray(&jsarr, flags_[i]);
   }
 }
 
 }  // namespace dart