Skip making code pages temporarily writable when finalizing the VM isolate loaded from precompiled …

runtime/vm/pages.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/pages.h"
 
 #include "platform/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 639 matching lines @@
       RawObject* obj = it.page()->FindObject(visitor);
       if (obj != Object::null()) {
         return obj;
       }
     }
   }
   return Object::null();
 }
 
 
-void PageSpace::WriteProtect(bool read_only) {
+void PageSpace::WriteProtect(bool read_only, bool include_code_pages) {
   if (read_only) {
     // Avoid MakeIterable trying to write to the heap.
     AbandonBumpAllocation();
   }
   for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
-    it.page()->WriteProtect(read_only);
+    if ((it.page()->type() != HeapPage::kExecutable) || include_code_pages) {
+      it.page()->WriteProtect(read_only);
+    }
   }
 }
 
 
 void PageSpace::PrintToJSONObject(JSONObject* object) const {
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate != NULL);
   JSONObject space(object, "old");
   space.AddProperty("type", "HeapSpace");
   space.AddProperty("name", "old");
@@ skipping 536 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result = static_cast<int>((static_cast<double>(gc_time) /
                                    static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart