- Reduce the number of Isolate::Current() calls.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 11589 matching lines @@
     // Set object pool in Instructions object.
     const GrowableObjectArray& object_pool = assembler->object_pool();
     if (object_pool.IsNull()) {
       instrs.set_object_pool(Object::empty_array().raw());
     } else {
       // TODO(regis): Once MakeArray takes a Heap::Space argument, call it here
       // with Heap::kOld and change the ARM and MIPS assemblers to work with a
       // GrowableObjectArray in new space.
       instrs.set_object_pool(Array::MakeArray(object_pool));
     }
-    bool status =
-        VirtualMemory::Protect(reinterpret_cast<void*>(instrs.raw_ptr()),
-                               instrs.raw()->Size(),
-                               FLAG_write_protect_code
-                                   ? VirtualMemory::kReadExecute
-                                   : VirtualMemory::kReadWriteExecute);
-    ASSERT(status);
+    if (FLAG_write_protect_code) {
+      bool status = VirtualMemory::Protect(
+          reinterpret_cast<void*>(instrs.raw_ptr()), instrs.raw()->Size(),
+          VirtualMemory::kReadExecute);
+      ASSERT(status);
+    }
   }
   code.set_comments(assembler->GetCodeComments());
   return code.raw();
 }
 
 
 RawCode* Code::FinalizeCode(const Function& function,
                             Assembler* assembler,
                             bool optimized) {
   // Calling ToFullyQualifiedCString is very expensive, try to avoid it.
@@ skipping 7229 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart