Add Function based profile tree

runtime/vm/thread_interrupter_linux.cc

 // Copyright (c) 2013, 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 "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "vm/flags.h"
 #include "vm/os.h"
 #include "vm/signal_handler.h"
@@ skipping 19 matching lines @@
     ASSERT(OSThread::Compare(state->id, OSThread::GetCurrentThreadId()));
     // Extract thread state.
     ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
     mcontext_t mcontext = context->uc_mcontext;
     InterruptedThreadState its;
     its.tid = state->id;
     its.pc = SignalHandler::GetProgramCounter(mcontext);
     its.fp = SignalHandler::GetFramePointer(mcontext);
     its.csp = SignalHandler::GetCStackPointer(mcontext);
     its.dsp = SignalHandler::GetDartStackPointer(mcontext);
+    its.lr = SignalHandler::GetLinkRegister(mcontext);
     state->callback(its, state->data);
   }
 };
 
 
 void ThreadInterrupter::InterruptThread(InterruptableThreadState* state) {
   if (FLAG_trace_thread_interrupter) {
     OS::Print("ThreadInterrupter interrupting %p\n",
               reinterpret_cast<void*>(state->id));
   }
   pthread_kill(state->id, SIGPROF);
 }
 
 
 void ThreadInterrupter::InstallSignalHandler() {
   SignalHandler::Install(ThreadInterrupterLinux::ThreadInterruptSignalHandler);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)