Provide a mechanism for dumping of heap profiles on predefined events.

runtime/vm/isolate.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/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "lib/mirrors.h"
 #include "vm/compiler_stats.h"
@@ skipping 12 matching lines @@
 #include "vm/thread.h"
 #include "vm/timer.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, report_usage_count, false,
             "Track function usage and report.");
 DEFINE_FLAG(bool, trace_isolates, false,
             "Trace isolate creation and shut down.");
+DECLARE_FLAG(bool, heap_profile_out_of_memory);
 DECLARE_FLAG(bool, generate_gdb_symbols);
 
 
 class IsolateMessageHandler : public MessageHandler {
  public:
   explicit IsolateMessageHandler(Isolate* isolate);
   ~IsolateMessageHandler();
 
   const char* name() const;
   void MessageNotify(Message::Priority priority);
@@ skipping 89 matching lines @@
 #endif
 
 
 bool IsolateMessageHandler::IsCurrentIsolate() const {
   return (isolate_ == Isolate::Current());
 }
 
 
 bool IsolateMessageHandler::ProcessUnhandledException(const Object& result) {
   isolate_->object_store()->set_sticky_error(Error::Cast(result));
+  if (FLAG_heap_profile_out_of_memory) {
+    Instance& exception = Instance::Handle();
+    if (result.IsUnhandledException()) {
+      exception ^= UnhandledException::Cast(result).exception();
+    } else {
+      ASSERT(result.IsError());
+      exception ^= result.raw();

[siva, 2012/12/10 05:06:36]

I think this else part is not needed and the OOM check can be done under
if (result.IsUnhandledException()) {
  ....
   ...
} itself.

+    }
+    if (exception.raw() == isolate_->object_store()->out_of_memory()) {
+      isolate_->heap()->ProfileToFile("out-of-memory");
+    }
+  }
   // Invoke the dart unhandled exception callback if there is one.
   if (Isolate::UnhandledExceptionCallback() != NULL) {
     Dart_EnterScope();
     Dart_Handle error = Api::NewHandle(isolate_, result.raw());
     (Isolate::UnhandledExceptionCallback())(error);
     Dart_ExitScope();
   }
   return false;
 }
 
@@ skipping 362 matching lines @@
 
 
 void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor,
                                          bool visit_prologue_weak_handles) {
   if (api_state() != NULL) {
     api_state()->VisitWeakHandles(visitor, visit_prologue_weak_handles);
   }
 }
 
 }  // namespace dart