One Zone per CompilationInfo.

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 1778 matching lines @@
 // function is still activated on the stack. It will also make sure that
 // the full code is compiled with the same flags as the previous version,
 // that is flags which can change the code generated. The current method
 // of mapping from already compiled full code without debug break slots
 // to full code with debug break slots depends on the generated code is
 // otherwise exactly the same.
 static bool CompileFullCodeForDebugging(Handle<JSFunction> function,
                                         Handle<Code> current_code) {
   ASSERT(!current_code->has_debug_break_slots());
 
-  CompilationInfo info(function);
+  Zone zone(function->GetIsolate());
+  CompilationInfo info(function, &zone);
+  ZoneScope scope(&zone, DELETE_ON_EXIT);
   info.MarkCompilingForDebugging(current_code);
   ASSERT(!info.shared_info()->is_compiled());
   ASSERT(!info.isolate()->has_pending_exception());
 
   // Use compile lazy which will end up compiling the full code in the
   // configuration configured above.
   bool result = Compiler::CompileLazy(&info);
   ASSERT(result != Isolate::Current()->has_pending_exception());
   info.isolate()->clear_pending_exception();
 #if DEBUG
@@ skipping 216 matching lines @@
           shared->code()->kind() == Code::BUILTIN) {
         continue;
       }
 
       // Make sure that the shared full code is compiled with debug
       // break slots.
       if (!shared->code()->has_debug_break_slots()) {
         // Try to compile the full code with debug break slots. If it
         // fails just keep the current code.
         Handle<Code> current_code(function->shared()->code());
-        ZoneScope zone_scope(isolate_, DELETE_ON_EXIT);
         shared->set_code(*lazy_compile);
         bool prev_force_debugger_active =
             isolate_->debugger()->force_debugger_active();
         isolate_->debugger()->set_force_debugger_active(true);
         ASSERT(current_code->kind() == Code::FUNCTION);
         CompileFullCodeForDebugging(function, current_code);
         isolate_->debugger()->set_force_debugger_active(
             prev_force_debugger_active);
         if (!shared->is_compiled()) {
           shared->set_code(*current_code);
@@ skipping 1574 matching lines @@
     {
       Locker locker;
       Isolate::Current()->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal