Abort optimization when debugger is turned on.

src/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2042 matching lines @@
 
       // Scan the heap for all non-optimized functions which have no
       // debug break slots and are not active or inlined into an active
       // function and mark them for lazy compilation.
       HeapIterator iterator(heap);
       HeapObject* obj = NULL;
       while (((obj = iterator.next()) != NULL)) {
         if (obj->IsJSFunction()) {
           JSFunction* function = JSFunction::cast(obj);
           SharedFunctionInfo* shared = function->shared();
-          if (shared->allows_lazy_compilation() &&
-              shared->script()->IsScript() &&
-              function->code()->kind() == Code::FUNCTION &&
-              !function->code()->has_debug_break_slots() &&
-              shared->code()->gc_metadata() != active_code_marker) {
+
+          if (!shared->allows_lazy_compilation()) continue;
+          if (!shared->script()->IsScript()) continue;
+          if (shared->code()->gc_metadata() == active_code_marker) continue;
+
+          Code::Kind kind = function->code()->kind();
+          if (kind == Code::FUNCTION &&
+              !function->code()->has_debug_break_slots()) {
             function->set_code(*lazy_compile);
             function->shared()->set_code(*lazy_compile);
+          } else if (kind == Code::BUILTIN &&
+              (function->IsMarkedForInstallingRecompiledCode() ||
+               function->IsInRecompileQueue() ||
+               function->IsMarkedForLazyRecompilation() ||
+               function->IsMarkedForParallelRecompilation())) {
+            // Abort in-flight compilation.
+            Code* shared_code = function->shared()->code();
+            if (shared_code->kind() == Code::FUNCTION &&
+                shared_code->has_debug_break_slots()) {
+              function->set_code(shared_code);
+            } else {
+              function->set_code(*lazy_compile);
+              function->shared()->set_code(*lazy_compile);
+            }
           }
         }
       }
 
       // Clear gc_metadata field.
       for (int i = 0; i < active_functions.length(); i++) {
         Handle<JSFunction> function = active_functions[i];
         function->shared()->code()->set_gc_metadata(Smi::FromInt(0));
       }
     }
@@ skipping 1734 matching lines @@
     {
       Locker locker(reinterpret_cast<v8::Isolate*>(isolate_));
       isolate_->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal