Enable the profiler on the simulator

runtime/vm/simulator_arm64.cc

 // Copyright (c) 2014, 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 <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
@@ skipping 598 matching lines @@
     return new Redirection(external_function, call_kind, argument_count);
   }
 
   static Redirection* FromHltInstruction(Instr* hlt_instruction) {
     char* addr_of_hlt = reinterpret_cast<char*>(hlt_instruction);
     char* addr_of_redirection =
         addr_of_hlt - OFFSET_OF(Redirection, hlt_instruction_);
     return reinterpret_cast<Redirection*>(addr_of_redirection);
   }
 
+  static uword FunctionForRedirect(uword address_of_hlt) {
+    Redirection* current;
+    for (current = list_; current != NULL; current = current->next_) {
+      if (current->address_of_hlt_instruction() == address_of_hlt) {
+        return current->external_function_;
+      }
+    }
+    return 0;
+  }
+
  private:
   static const int32_t kRedirectInstruction = Instr::kRedirectInstruction;
   Redirection(uword external_function,
               Simulator::CallKind call_kind,
               int argument_count)
       : external_function_(external_function),
         call_kind_(call_kind),
         argument_count_(argument_count),
         hlt_instruction_(kRedirectInstruction),
         next_(list_) {
@@ skipping 14 matching lines @@
 
 uword Simulator::RedirectExternalReference(uword function,
                                            CallKind call_kind,
                                            int argument_count) {
   Redirection* redirection =
       Redirection::Get(function, call_kind, argument_count);
   return redirection->address_of_hlt_instruction();
 }
 
 
+uword Simulator::FunctionForRedirect(uword redirect) {
+  return Redirection::FunctionForRedirect(redirect);
+}
+
+
 // Get the active Simulator for the current isolate.
 Simulator* Simulator::Current() {
   Simulator* simulator = Isolate::Current()->simulator();
   if (simulator == NULL) {
     simulator = new Simulator();
     Isolate::Current()->set_simulator(simulator);
   }
   return simulator;
 }
 
@@ skipping 2478 matching lines @@
   set_register(NULL, kExceptionObjectReg, bit_cast<int64_t>(raw_exception));
   set_register(NULL, kStackTraceObjectReg, bit_cast<int64_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_ARM64)
 
 #endif  // defined TARGET_ARCH_ARM64