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

runtime/vm/debugger.h

Index: runtime/vm/debugger.h
===================================================================
--- runtime/vm/debugger.h	(revision 18152)
+++ runtime/vm/debugger.h	(working copy)
@@ -5,6 +5,9 @@
 #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"
@@ -380,6 +383,38 @@
 };
 
 
+// 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_