Compress memory usage. Imprive speed of finding exception handlers: if a code does not have any han…

runtime/vm/exceptions.cc

 // Copyright (c) 2011, 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/exceptions.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/flags.h"
@@ skipping 347 matching lines @@
   __asan_unpoison_memory_region(reinterpret_cast<void*>(current_sp),
                                 stack_pointer - current_sp);
   func(program_counter, stack_pointer, frame_pointer,
        raw_exception, raw_stacktrace);
 #endif
   UNREACHABLE();
 }
 
 
 static RawField* LookupStacktraceField(const Instance& instance) {
+  if (instance.GetClassId() < kNumPredefinedCids) {
+    // 'error_class' is not a predefined class.

[siva, 2013/08/29 16:29:20]

// 'class Error' is not a predefined class.

[srdjan, 2013/08/29 16:38:13]

Done.

+    return Field::null();
+  }
   Isolate* isolate = Isolate::Current();
   Class& error_class = Class::Handle(isolate,
                                      isolate->object_store()->error_class());
   if (error_class.IsNull()) {
     const Library& core_lib = Library::Handle(isolate, Library::CoreLibrary());
     error_class = core_lib.LookupClass(Symbols::Error(), NULL);
     ASSERT(!error_class.IsNull());
     isolate->object_store()->set_error_class(error_class);
   }
   const Class& instance_class = Class::Handle(isolate, instance.clazz());
@@ skipping 367 matching lines @@
       break;
   }
 
   return DartLibraryCalls::InstanceCreate(library,
                                           *class_name,
                                           *constructor_name,
                                           arguments);
 }
 
 }  // namespace dart