Add StackTrace.current getter.

runtime/lib/stacktrace.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 "vm/bootstrap_natives.h"
 #include "vm/exceptions.h"
 #include "vm/object_store.h"
 #include "vm/runtime_entry.h"
 #include "vm/stack_frame.h"
 
@@ skipping 30 matching lines @@
       GrowableObjectArray::Handle(GrowableObjectArray::New());
   IterateFrames(code_list, pc_offset_list);
   const Array& code_array = Array::Handle(Array::MakeArray(code_list));
   const Array& pc_offset_array =
       Array::Handle(Array::MakeArray(pc_offset_list));
   const Stacktrace& stacktrace = Stacktrace::Handle(
       Stacktrace::New(code_array, pc_offset_array));
   OS::PrintErr("=== Current Trace:\n%s===\n", stacktrace.ToCString());
 }
 
+DEFINE_NATIVE_ENTRY(StackTrace_current, 0) {
+  const GrowableObjectArray& code_list =
+      GrowableObjectArray::Handle(GrowableObjectArray::New());
+  const GrowableObjectArray& pc_offset_list =
+      GrowableObjectArray::Handle(GrowableObjectArray::New());
+  // Skip the StackFrame.current frame.
+  IterateFrames(code_list, pc_offset_list);
+  const Array& code_array = Array::Handle(Array::MakeArray(code_list));
+  const Array& pc_offset_array =
+      Array::Handle(Array::MakeArray(pc_offset_list));
+  const Stacktrace& stacktrace = Stacktrace::Handle(
+      Stacktrace::New(code_array, pc_offset_array));
+  return stacktrace.raw();
+}

[Lasse Reichstein Nielsen, 2015/11/18 10:11:38]

The VM even has the option of dropping the first stack frame, so
`StackTrace.current` itself won't show up in the captured trace. I think we
should do that. It's not as easy in JS, but that shouldn't prevent us from doing
the right thing here.

+
+
 }  // namespace dart