[interpreter] Fix stack trace printers for debugging.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 1309 matching lines @@
   return ReThrow(thrown);
 }
 
 
 void Isolate::PrintCurrentStackTrace(FILE* out) {
   StackTraceFrameIterator it(this);
   while (!it.done()) {
     HandleScope scope(this);
     // Find code position if recorded in relocation info.
     StandardFrame* frame = it.frame();
-    Code* code = frame->LookupCode();
-    int offset = static_cast<int>(frame->pc() - code->instruction_start());
-    int pos = frame->LookupCode()->SourcePosition(offset);
+    int pos;
+    if (frame->is_java_script() &&

[Michael Starzinger, 2016/04/21 17:05:18]

nit: Just "frame->is_interpreted()" is sufficient. No need to cast.

[Yang, 2016/04/22 05:03:39]

Done.

+        JavaScriptFrame::cast(frame)->is_interpreted()) {
+      InterpretedFrame* iframe = reinterpret_cast<InterpretedFrame*>(frame);
+      pos = iframe->GetBytecodeArray()->SourcePosition(
+          iframe->GetBytecodeOffset());
+    } else {
+      Code* code = frame->LookupCode();
+      int offset = static_cast<int>(frame->pc() - code->instruction_start());
+      pos = frame->LookupCode()->SourcePosition(offset);
+    }
     Handle<Object> pos_obj(Smi::FromInt(pos), this);
     // Fetch function and receiver.
     Handle<JSFunction> fun(frame->function());
     Handle<Object> recv(frame->receiver(), this);
     // Advance to the next JavaScript frame and determine if the
     // current frame is the top-level frame.
     it.Advance();
     Handle<Object> is_top_level = factory()->ToBoolean(it.done());
     // Generate and print stack trace line.
     Handle<String> line =
@@ skipping 1644 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8