Initial prototype of vmstats support, based on Dart VM Stats draft design doc.

runtime/vm/debugger.h

 // 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.
 
 #ifndef VM_DEBUGGER_H_
 #define VM_DEBUGGER_H_
 
+#include <cstring>
+#include <map>

[siva, 2013/02/09 01:00:57]

We have generally tried to avoid usage of map inside the VM sources.

[Tom Ball, 2013/02/14 23:45:16]

STL references removed.

+
 #include "include/dart_debugger_api.h"
 
 #include "vm/object.h"
 #include "vm/port.h"
 
 namespace dart {
 
 class SourceBreakpoint;
 class CodeBreakpoint;
 class Isolate;
@@ skipping 355 matching lines @@
   intptr_t exc_pause_info_;
 
   static BreakpointHandler* bp_handler_;
   static EventHandler* event_handler_;
 
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
+// Singleton service managing VM status gathering and status plug-in
+// registration.
+class VmStatusService {
+ public:
+  static Dart_Handle RegisterPlugin(
+      const char* status_type, Dart_VmStatusCallback callback);
+
+  // Returns VM status for a specified request. The caller is responsible
+  // for releasing the heap memory after use.
+  static char* Dart_GetVmStatus(const char* request);
+
+  static void InitOnce();
+
+ private:
+  VmStatusService() {}
+
+  static VmStatusService* instance_;
+
+  struct strcmp {
+     bool operator()(char const *a, char const *b) {
+        return std::strcmp(a, b) < 0;
+     }
+  };
+
+  typedef std::map<const char*, Dart_VmStatusCallback, strcmp> ServiceMap;
+
+  ServiceMap service_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(VmStatusService);
+};
+
+
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_