Support VTune's JIT interface.

runtime/vm/vtune.cc

Index: runtime/vm/vtune.cc
diff --git a/runtime/vm/vtune.cc b/runtime/vm/vtune.cc
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+++ b/runtime/vm/vtune.cc
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+// 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/vtune.h"
+
+#if defined(DART_VTUNE_SUPPORT)
+#  include <jitprofiling.h>
+#endif
+
+namespace dart {
+
+#if defined(DART_VTUNE_SUPPORT)
+bool VTune::IsActive() {
+  return (iJIT_IsProfilingActive() == iJIT_SAMPLING_ON);
+}
+
+
+void VTune::Register(const char* name, uword base, uword size) {
+  if (!IsActive()) return;
+
+  iJIT_Method_Load jmethod;
+  memset(&jmethod, 0, sizeof(jmethod));
+  jmethod.method_id = iJIT_GetNewMethodID();
+  jmethod.method_name = const_cast<char*>(name);
+  jmethod.method_load_address = reinterpret_cast<void*>(base);
+  jmethod.method_size = size;
+  iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED, &jmethod);
+}
+#else
+bool VTune::IsActive() {
+  return false;
+}
+
+
+void VTune::Register(const char* name, uword base, uword size) {
+  /* Nothing to do */
+}
+#endif
+
+
+}  // namespace dart