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
new file mode 100644
index 0000000000000000000000000000000000000000..5f657c096af909e094aeb814fa8fa97dfe793314
--- /dev/null
+++ b/runtime/vm/vtune.cc
@@ -0,0 +1,50 @@
+// 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 VTuneCodeObserver::IsActive() const {
+  return (iJIT_IsProfilingActive() == iJIT_SAMPLING_ON);
+}
+
+
+void VTuneCodeObserver::Notify(const char* name,
+                               uword base,
+                               uword prologue_offset,
+                               uword size,
+                               bool optimized) {
+  ASSERT(IsActive());
+  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 VTuneCodeObserver::IsActive() const {

[Ivan Posva, 2012/11/27 09:11:20]

Do you even need to supply these UNREACHABLE methods if DART_VTUNE_SUPPORT is
not enabled?

[Vyacheslav Egorov (Google), 2012/11/27 16:26:12]

Done.

+  UNREACHABLE();
+  return false;
+}
+
+
+void VTuneCodeObserver::Notify(const char* name,
+                               uword base,
+                               uword prologue_offset,
+                               uword size,
+                               bool optimized) {
+  UNREACHABLE();
+}
+#endif
+
+
+}  // namespace dart