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"
 
 namespace dart {
 
 static void IterateFrames(const GrowableObjectArray& code_list,
-                          const GrowableObjectArray& pc_offset_list) {
+                          const GrowableObjectArray& pc_offset_list,
+                          int skip_frames) {
   StackFrameIterator frames(StackFrameIterator::kDontValidateFrames);
   StackFrame* frame = frames.NextFrame();
   ASSERT(frame != NULL);  // We expect to find a dart invocation frame.
   Code& code = Code::Handle();
   Smi& offset = Smi::Handle();
   while (frame != NULL) {
     if (frame->IsDartFrame()) {
-      code = frame->LookupDartCode();
-      offset = Smi::New(frame->pc() - code.EntryPoint());
-      code_list.Add(code);
-      pc_offset_list.Add(offset);
+      if (skip_frames > 0) {
+        skip_frames--;
+      } else {
+        code = frame->LookupDartCode();
+        offset = Smi::New(frame->pc() - code.EntryPoint());
+        code_list.Add(code);
+        pc_offset_list.Add(offset);
+      }
     }
     frame = frames.NextFrame();
   }
 }
 
 
 // An utility method for convenient printing of dart stack traces when
 // inside 'gdb'. Note: This function will only work when there is a
 // valid exit frame information. It will not work when a breakpoint is
 // set in dart code and control is got inside 'gdb' without going through
 // the runtime or native transition stub.
 void _printCurrentStacktrace() {
   const GrowableObjectArray& code_list =
       GrowableObjectArray::Handle(GrowableObjectArray::New());
   const GrowableObjectArray& pc_offset_list =
       GrowableObjectArray::Handle(GrowableObjectArray::New());
-  IterateFrames(code_list, pc_offset_list);
+  IterateFrames(code_list, pc_offset_list, 0);
   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 =

[Ivan Posva, 2015/11/24 00:53:58]

This whole code needs to be de-deduplicated:
https://github.com/dart-lang/sdk/issues/25029

[Lasse Reichstein Nielsen, 2015/11/24 06:52:56]

I'll start by moving it to a static function in this file, so at least the code
isn't duplicated here. If there are other occurrences, you can unify it with
those.

+      GrowableObjectArray::Handle(GrowableObjectArray::New());
+  const GrowableObjectArray& pc_offset_list =
+      GrowableObjectArray::Handle(GrowableObjectArray::New());
+  // Skip the StackFrame.current frame.
+  IterateFrames(code_list, pc_offset_list, 1);
+  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();
+}
+
+
 }  // namespace dart