--- a/hotspot/make/share/makefiles/mapfile-vers	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/make/share/makefiles/mapfile-vers	Fri Apr 08 12:26:29 2016 -0700
@@ -41,7 +41,6 @@
                 JVM_DumpAllStacks;
                 JVM_DumpThreads;
                 JVM_FillInStackTrace;
-                JVM_FillStackFrames;
                 JVM_FindClassFromCaller;
                 JVM_FindClassFromClass;
                 JVM_FindClassFromBootLoader;
@@ -157,13 +156,13 @@
                 JVM_SetClassSigners;
                 JVM_SetNativeThreadName;
                 JVM_SetPrimitiveArrayElement;
-                JVM_SetMethodInfo;
                 JVM_SetThreadPriority;
                 JVM_Sleep;
                 JVM_StartThread;
                 JVM_StopThread;
                 JVM_SuspendThread;
                 JVM_SupportsCX8;
+                JVM_ToStackTraceElement;
                 JVM_TotalMemory;
                 JVM_UnloadLibrary;
                 JVM_Yield;

--- a/hotspot/makefiles/symbols/symbols-unix	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/makefiles/symbols/symbols-unix	Fri Apr 08 12:26:29 2016 -0700
@@ -58,7 +58,6 @@
 JVM_DumpAllStacks
 JVM_DumpThreads
 JVM_FillInStackTrace
-JVM_FillStackFrames
 JVM_FindClassFromCaller
 JVM_FindClassFromClass
 JVM_FindLibraryEntry
@@ -169,7 +168,6 @@
 JVM_ResumeThread
 JVM_SetArrayElement
 JVM_SetClassSigners
-JVM_SetMethodInfo
 JVM_SetNativeThreadName
 JVM_SetPrimitiveArrayElement
 JVM_SetThreadPriority
@@ -178,6 +176,7 @@
 JVM_StopThread
 JVM_SupportsCX8
 JVM_SuspendThread
+JVM_ToStackTraceElement
 JVM_TotalMemory
 JVM_UnloadLibrary
 JVM_Yield

--- a/hotspot/src/share/vm/classfile/javaClasses.cpp	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/classfile/javaClasses.cpp	Fri Apr 08 12:26:29 2016 -0700
@@ -2187,43 +2187,19 @@
 }
 
 Method* java_lang_StackFrameInfo::get_method(Handle stackFrame, InstanceKlass* holder, TRAPS) {
-  if (MemberNameInStackFrame) {
-    Handle mname(THREAD, stackFrame->obj_field(_memberName_offset));
-    Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mname());
-    // we should expand MemberName::name when Throwable uses StackTrace
-    // MethodHandles::expand_MemberName(mname, MethodHandles::_suppress_defc|MethodHandles::_suppress_type, CHECK_NULL);
-    return method;
-  } else {
-    short mid       = stackFrame->short_field(_mid_offset);
-    short version   = stackFrame->short_field(_version_offset);
-    return holder->method_with_orig_idnum(mid, version);
-  }
-}
-
-Symbol* java_lang_StackFrameInfo::get_file_name(Handle stackFrame, InstanceKlass* holder) {
-  if (MemberNameInStackFrame) {
-    return holder->source_file_name();
-  } else {
-    short version = stackFrame->short_field(_version_offset);
-    return Backtrace::get_source_file_name(holder, version);
-  }
+  Handle mname(THREAD, stackFrame->obj_field(_memberName_offset));
+  Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mname());
+  // we should expand MemberName::name when Throwable uses StackTrace
+  // MethodHandles::expand_MemberName(mname, MethodHandles::_suppress_defc|MethodHandles::_suppress_type, CHECK_NULL);
+  return method;
 }
 
 void java_lang_StackFrameInfo::set_method_and_bci(Handle stackFrame, const methodHandle& method, int bci) {
   // set Method* or mid/cpref
-  if (MemberNameInStackFrame) {
-    oop mname = stackFrame->obj_field(_memberName_offset);
-    InstanceKlass* ik = method->method_holder();
-    CallInfo info(method(), ik);
-    MethodHandles::init_method_MemberName(mname, info);
-  } else {
-    int mid = method->orig_method_idnum();
-    int cpref = method->name_index();
-    assert((jushort)mid == mid,        "mid should be short");
-    assert((jushort)cpref == cpref,    "cpref should be short");
-    java_lang_StackFrameInfo::set_mid(stackFrame(),     (short)mid);
-    java_lang_StackFrameInfo::set_cpref(stackFrame(),   (short)cpref);
-  }
+  oop mname = stackFrame->obj_field(_memberName_offset);
+  InstanceKlass* ik = method->method_holder();
+  CallInfo info(method(), ik);
+  MethodHandles::init_method_MemberName(mname, info);
   // set bci
   java_lang_StackFrameInfo::set_bci(stackFrame(), bci);
   // method may be redefined; store the version
@@ -2232,52 +2208,23 @@
   java_lang_StackFrameInfo::set_version(stackFrame(), (short)version);
 }
 
-void java_lang_StackFrameInfo::fill_methodInfo(Handle stackFrame, TRAPS) {
+void java_lang_StackFrameInfo::to_stack_trace_element(Handle stackFrame, Handle stack_trace_element, TRAPS) {
   ResourceMark rm(THREAD);
-  oop k = stackFrame->obj_field(_declaringClass_offset);
-  InstanceKlass* holder = InstanceKlass::cast(java_lang_Class::as_Klass(k));
+  Handle k (THREAD, stackFrame->obj_field(_declaringClass_offset));
+  InstanceKlass* holder = InstanceKlass::cast(java_lang_Class::as_Klass(k()));
   Method* method = java_lang_StackFrameInfo::get_method(stackFrame, holder, CHECK);
-  int bci = stackFrame->int_field(_bci_offset);
-
-  // The method can be NULL if the requested class version is gone
-  Symbol* sym = (method != NULL) ? method->name() : NULL;
-  if (MemberNameInStackFrame) {
-    assert(sym != NULL, "MemberName must have method name");
-  } else {
-      // The method can be NULL if the requested class version is gone
-    if (sym == NULL) {
-      short cpref   = stackFrame->short_field(_cpref_offset);
-      sym = holder->constants()->symbol_at(cpref);
-    }
-  }
-
-  // set method name
-  oop methodname = StringTable::intern(sym, CHECK);
-  java_lang_StackFrameInfo::set_methodName(stackFrame(), methodname);
-
-  // set file name and line number
-  Symbol* source = get_file_name(stackFrame, holder);
-  if (source != NULL) {
-    oop filename = StringTable::intern(source, CHECK);
-    java_lang_StackFrameInfo::set_fileName(stackFrame(), filename);
-  }
-
-  // if the method has been redefined, the bci is no longer applicable
+
   short version = stackFrame->short_field(_version_offset);
-  if (version_matches(method, version)) {
-    int line_number = Backtrace::get_line_number(method, bci);
-    java_lang_StackFrameInfo::set_lineNumber(stackFrame(), line_number);
-  }
+  short bci = stackFrame->short_field(_bci_offset);
+  int cpref = method->name_index();
+  java_lang_StackTraceElement::fill_in(stack_trace_element, holder, method, version, bci, cpref, CHECK);
 }
 
 void java_lang_StackFrameInfo::compute_offsets() {
   Klass* k = SystemDictionary::StackFrameInfo_klass();
   compute_offset(_declaringClass_offset, k, vmSymbols::declaringClass_name(),  vmSymbols::class_signature());
   compute_offset(_memberName_offset,     k, vmSymbols::memberName_name(),  vmSymbols::object_signature());
-  compute_offset(_bci_offset,            k, vmSymbols::bci_name(),         vmSymbols::int_signature());
-  compute_offset(_methodName_offset,     k, vmSymbols::methodName_name(),  vmSymbols::string_signature());
-  compute_offset(_fileName_offset,       k, vmSymbols::fileName_name(),    vmSymbols::string_signature());
-  compute_offset(_lineNumber_offset,     k, vmSymbols::lineNumber_name(),  vmSymbols::int_signature());
+  compute_offset(_bci_offset,            k, vmSymbols::bci_name(),         vmSymbols::short_signature());
   STACKFRAMEINFO_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
@@ -3690,12 +3637,7 @@
 int java_lang_StackFrameInfo::_declaringClass_offset;
 int java_lang_StackFrameInfo::_memberName_offset;
 int java_lang_StackFrameInfo::_bci_offset;
-int java_lang_StackFrameInfo::_methodName_offset;
-int java_lang_StackFrameInfo::_fileName_offset;
-int java_lang_StackFrameInfo::_lineNumber_offset;
-int java_lang_StackFrameInfo::_mid_offset;
 int java_lang_StackFrameInfo::_version_offset;
-int java_lang_StackFrameInfo::_cpref_offset;
 int java_lang_LiveStackFrameInfo::_monitors_offset;
 int java_lang_LiveStackFrameInfo::_locals_offset;
 int java_lang_LiveStackFrameInfo::_operands_offset;
@@ -3741,34 +3683,14 @@
   element->obj_field_put(_declaringClass_offset, value);
 }
 
-void java_lang_StackFrameInfo::set_mid(oop element, short value) {
-  element->short_field_put(_mid_offset, value);
-}
-
 void java_lang_StackFrameInfo::set_version(oop element, short value) {
   element->short_field_put(_version_offset, value);
 }
 
-void java_lang_StackFrameInfo::set_cpref(oop element, short value) {
-  element->short_field_put(_cpref_offset, value);
-}
-
 void java_lang_StackFrameInfo::set_bci(oop element, int value) {
   element->int_field_put(_bci_offset, value);
 }
 
-void java_lang_StackFrameInfo::set_fileName(oop element, oop value) {
-  element->obj_field_put(_fileName_offset, value);
-}
-
-void java_lang_StackFrameInfo::set_methodName(oop element, oop value) {
-  element->obj_field_put(_methodName_offset, value);
-}
-
-void java_lang_StackFrameInfo::set_lineNumber(oop element, int value) {
-  element->int_field_put(_lineNumber_offset, value);
-}
-
 void java_lang_LiveStackFrameInfo::set_monitors(oop element, oop value) {
   element->obj_field_put(_monitors_offset, value);
 }

--- a/hotspot/src/share/vm/classfile/javaClasses.hpp	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/classfile/javaClasses.hpp	Fri Apr 08 12:26:29 2016 -0700
@@ -1364,25 +1364,16 @@
 // Interface to java.lang.StackFrameInfo objects
 
 #define STACKFRAMEINFO_INJECTED_FIELDS(macro)                      \
-  macro(java_lang_StackFrameInfo, mid,     short_signature, false) \
-  macro(java_lang_StackFrameInfo, version, short_signature, false) \
-  macro(java_lang_StackFrameInfo, cpref,   short_signature, false)
+  macro(java_lang_StackFrameInfo, version, short_signature, false)
 
 class java_lang_StackFrameInfo: AllStatic {
 private:
   static int _declaringClass_offset;
   static int _memberName_offset;
   static int _bci_offset;
-  static int _methodName_offset;
-  static int _fileName_offset;
-  static int _lineNumber_offset;
-
-  static int _mid_offset;
   static int _version_offset;
-  static int _cpref_offset;
 
   static Method* get_method(Handle stackFrame, InstanceKlass* holder, TRAPS);
-  static Symbol* get_file_name(Handle stackFrame, InstanceKlass* holder);
 
 public:
   // Setters
@@ -1390,19 +1381,12 @@
   static void set_method_and_bci(Handle stackFrame, const methodHandle& method, int bci);
   static void set_bci(oop info, int value);
 
-  // set method info in an instance of StackFrameInfo
-  static void fill_methodInfo(Handle info, TRAPS);
-  static void set_methodName(oop info, oop value);
-  static void set_fileName(oop info, oop value);
-  static void set_lineNumber(oop info, int value);
-
-  // these injected fields are only used if -XX:-MemberNameInStackFrame set
-  static void set_mid(oop info, short value);
   static void set_version(oop info, short value);
-  static void set_cpref(oop info, short value);
 
   static void compute_offsets();
 
+  static void to_stack_trace_element(Handle stackFrame, Handle stack_trace_element, TRAPS);
+
   // Debugging
   friend class JavaClasses;
 };

--- a/hotspot/src/share/vm/prims/jvm.cpp	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/prims/jvm.cpp	Fri Apr 08 12:26:29 2016 -0700
@@ -534,7 +534,6 @@
 
 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
                                      jint skip_frames, jint frame_count, jint start_index,
-                                     jobjectArray classes,
                                      jobjectArray frames))
   JVMWrapper("JVM_CallStackWalk");
   JavaThread* jt = (JavaThread*) THREAD;
@@ -543,78 +542,51 @@
   }
 
   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
-  objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(classes));
-  objArrayHandle classes_array_h(THREAD, ca);
-
-  // frames array is null when only getting caller reference
-  objArrayOop fa = objArrayOop(JNIHandles::resolve(frames));
+
+  // frames array is a Class<?>[] array when only getting caller reference,
+  // and a StackFrameInfo[] array (or derivative) otherwise. It should never
+  // be null.
+  objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
   objArrayHandle frames_array_h(THREAD, fa);
 
   int limit = start_index + frame_count;
-  if (classes_array_h->length() < limit) {
+  if (frames_array_h->length() < limit) {
     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
   }
 
   Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
-                                  start_index, classes_array_h,
-                                  frames_array_h, CHECK_NULL);
+                                  start_index, frames_array_h, CHECK_NULL);
   return JNIHandles::make_local(env, result());
 JVM_END
 
 
 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
                                   jint frame_count, jint start_index,
-                                  jobjectArray classes,
                                   jobjectArray frames))
   JVMWrapper("JVM_MoreStackWalk");
   JavaThread* jt = (JavaThread*) THREAD;
-  objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(classes));
-  objArrayHandle classes_array_h(THREAD, ca);
-
-  // frames array is null when only getting caller reference
-  objArrayOop fa = objArrayOop(JNIHandles::resolve(frames));
+
+  // frames array is a Class<?>[] array when only getting caller reference,
+  // and a StackFrameInfo[] array (or derivative) otherwise. It should never
+  // be null.
+  objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
   objArrayHandle frames_array_h(THREAD, fa);
 
   int limit = start_index+frame_count;
-  if (classes_array_h->length() < limit) {
+  if (frames_array_h->length() < limit) {
     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
   }
 
   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
   return StackWalk::moreFrames(stackStream_h, mode, anchor, frame_count,
-                               start_index, classes_array_h,
-                               frames_array_h, THREAD);
+                               start_index, frames_array_h, THREAD);
 JVM_END
 
-JVM_ENTRY(void, JVM_FillStackFrames(JNIEnv *env, jclass stackStream,
-                                    jint start_index,
-                                    jobjectArray frames,
-                                    jint from_index, jint to_index))
-  JVMWrapper("JVM_FillStackFrames");
-  if (TraceStackWalk) {
-    tty->print("JVM_FillStackFrames() start_index=%d from_index=%d to_index=%d\n",
-               start_index, from_index, to_index);
-  }
-
-  JavaThread* jt = (JavaThread*) THREAD;
-
-  objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
-  objArrayHandle frames_array_h(THREAD, fa);
-
-  if (frames_array_h->length() < to_index) {
-    THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array length not matched");
-  }
-
-  for (int i = from_index; i < to_index; i++) {
-    Handle stackFrame(THREAD, frames_array_h->obj_at(i));
-    java_lang_StackFrameInfo::fill_methodInfo(stackFrame, CHECK);
-  }
-JVM_END
-
-JVM_ENTRY(void, JVM_SetMethodInfo(JNIEnv *env, jobject frame))
-  JVMWrapper("JVM_SetMethodInfo");
-  Handle stackFrame(THREAD, JNIHandles::resolve(frame));
-  java_lang_StackFrameInfo::fill_methodInfo(stackFrame, THREAD);
+JVM_ENTRY(void, JVM_ToStackTraceElement(JNIEnv *env, jobject frame, jobject stack))
+  JVMWrapper("JVM_ToStackTraceElement");
+  Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(frame));
+  Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(stack));
+  java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 JVM_END
 
 // java.lang.Object ///////////////////////////////////////////////

--- a/hotspot/src/share/vm/prims/jvm.h	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/prims/jvm.h	Fri Apr 08 12:26:29 2016 -0700
@@ -209,7 +209,6 @@
  */
 enum {
   JVM_STACKWALK_FILL_CLASS_REFS_ONLY       = 0x2,
-  JVM_STACKWALK_FILTER_FILL_IN_STACK_TRACE = 0x10,
   JVM_STACKWALK_SHOW_HIDDEN_FRAMES         = 0x20,
   JVM_STACKWALK_FILL_LIVE_STACK_FRAMES     = 0x100
 };
@@ -217,23 +216,15 @@
 JNIEXPORT jobject JNICALL
 JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
                   jint skip_frames, jint frame_count, jint start_index,
-                  jobjectArray classes,
                   jobjectArray frames);
 
 JNIEXPORT jint JNICALL
 JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
                   jint frame_count, jint start_index,
-                  jobjectArray classes,
                   jobjectArray frames);
 
 JNIEXPORT void JNICALL
-JVM_FillStackFrames(JNIEnv* env, jclass cls,
-                    jint start_index,
-                    jobjectArray frames,
-                    jint from_index, jint toIndex);
-
-JNIEXPORT void JNICALL
-JVM_SetMethodInfo(JNIEnv* env, jobject frame);
+JVM_ToStackTraceElement(JNIEnv* env, jobject frame, jobject stackElement);
 
 /*
  * java.lang.Thread

--- a/hotspot/src/share/vm/prims/stackwalk.cpp	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/prims/stackwalk.cpp	Fri Apr 08 12:26:29 2016 -0700
@@ -37,22 +37,22 @@
 #include "utilities/globalDefinitions.hpp"
 
 // setup and cleanup actions
-void StackWalkAnchor::setup_magic_on_entry(objArrayHandle classes_array) {
-  classes_array->obj_at_put(magic_pos, _thread->threadObj());
+void StackWalkAnchor::setup_magic_on_entry(objArrayHandle frames_array) {
+  frames_array->obj_at_put(magic_pos, _thread->threadObj());
   _anchor = address_value();
-  assert(check_magic(classes_array), "invalid magic");
+  assert(check_magic(frames_array), "invalid magic");
 }
 
-bool StackWalkAnchor::check_magic(objArrayHandle classes_array) {
-  oop   m1 = classes_array->obj_at(magic_pos);
+bool StackWalkAnchor::check_magic(objArrayHandle frames_array) {
+  oop   m1 = frames_array->obj_at(magic_pos);
   jlong m2 = _anchor;
   if (m1 == _thread->threadObj() && m2 == address_value())  return true;
   return false;
 }
 
-bool StackWalkAnchor::cleanup_magic_on_exit(objArrayHandle classes_array) {
-  bool ok = check_magic(classes_array);
-  classes_array->obj_at_put(magic_pos, NULL);
+bool StackWalkAnchor::cleanup_magic_on_exit(objArrayHandle frames_array) {
+  bool ok = check_magic(frames_array);
+  frames_array->obj_at_put(magic_pos, NULL);
   _anchor = 0L;
   return ok;
 }
@@ -62,18 +62,18 @@
 // Parameters:
 //  thread         Current Java thread.
 //  magic          Magic value used for each stack walking
-//  classes_array  User-supplied buffers.  The 0th element is reserved
+//  frames_array   User-supplied buffers.  The 0th element is reserved
 //                 to this StackWalkAnchor to use
 //
 StackWalkAnchor* StackWalkAnchor::from_current(JavaThread* thread, jlong magic,
-                                               objArrayHandle classes_array)
+                                               objArrayHandle frames_array)
 {
   assert(thread != NULL && thread->is_Java_thread(), "");
-  oop m1 = classes_array->obj_at(magic_pos);
+  oop m1 = frames_array->obj_at(magic_pos);
   if (m1 != thread->threadObj())      return NULL;
   if (magic == 0L)                    return NULL;
   StackWalkAnchor* anchor = (StackWalkAnchor*) (intptr_t) magic;
-  if (!anchor->is_valid_in(thread, classes_array))   return NULL;
+  if (!anchor->is_valid_in(thread, frames_array))   return NULL;
   return anchor;
 }
 
@@ -88,24 +88,24 @@
 //   vfst           vFrameStream.
 //   max_nframes    Maximum number of frames to be filled.
 //   start_index    Start index to the user-supplied buffers.
-//   classes_array  Buffer to store classes in, starting at start_index.
-//   frames_array   Buffer to store StackFrame in, starting at start_index.
-//                  NULL if not used.
+//   frames_array   Buffer to store Class or StackFrame in, starting at start_index.
+//                  frames array is a Class<?>[] array when only getting caller
+//                  reference, and a StackFrameInfo[] array (or derivative)
+//                  otherwise. It should never be null.
 //   end_index      End index to the user-supplied buffers with unpacked frames.
 //
 // Returns the number of frames whose information was transferred into the buffers.
 //
 int StackWalk::fill_in_frames(jlong mode, vframeStream& vfst,
                               int max_nframes, int start_index,
-                              objArrayHandle  classes_array,
                               objArrayHandle  frames_array,
                               int& end_index, TRAPS) {
   if (TraceStackWalk) {
     tty->print_cr("fill_in_frames limit=%d start=%d frames length=%d",
-                  max_nframes, start_index, classes_array->length());
+                  max_nframes, start_index, frames_array->length());
   }
   assert(max_nframes > 0, "invalid max_nframes");
-  assert(start_index + max_nframes <= classes_array->length(), "oob");
+  assert(start_index + max_nframes <= frames_array->length(), "oob");
 
   int frames_decoded = 0;
   for (; !vfst.at_end(); vfst.next()) {
@@ -129,14 +129,18 @@
       tty->print_cr(" bci=%d", bci);
     }
 
-    classes_array->obj_at_put(index, method->method_holder()->java_mirror());
     // fill in StackFrameInfo and initialize MemberName
     if (live_frame_info(mode)) {
+      assert (use_frames_array(mode), "Bad mode for get live frame");
       Handle stackFrame(frames_array->obj_at(index));
       fill_live_stackframe(stackFrame, method, bci, vfst.java_frame(), CHECK_0);
     } else if (need_method_info(mode)) {
+      assert (use_frames_array(mode), "Bad mode for get stack frame");
       Handle stackFrame(frames_array->obj_at(index));
       fill_stackframe(stackFrame, method, bci);
+    } else {
+      assert (use_frames_array(mode) == false, "Bad mode for get caller class");
+      frames_array->obj_at_put(index, method->method_holder()->java_mirror());
     }
     if (++frames_decoded >= max_nframes)  break;
   }
@@ -279,15 +283,15 @@
 //   skip_frames    Number of frames to be skipped.
 //   frame_count    Number of frames to be traversed.
 //   start_index    Start index to the user-supplied buffers.
-//   classes_array  Buffer to store classes in, starting at start_index.
 //   frames_array   Buffer to store StackFrame in, starting at start_index.
-//                  NULL if not used.
+//                  frames array is a Class<?>[] array when only getting caller
+//                  reference, and a StackFrameInfo[] array (or derivative)
+//                  otherwise. It should never be null.
 //
 // Returns Object returned from AbstractStackWalker::doStackWalk call.
 //
 oop StackWalk::walk(Handle stackStream, jlong mode,
                     int skip_frames, int frame_count, int start_index,
-                    objArrayHandle classes_array,
                     objArrayHandle frames_array,
                     TRAPS) {
   JavaThread* jt = (JavaThread*)THREAD;
@@ -296,10 +300,8 @@
                   mode, skip_frames, frame_count);
   }
 
-  if (need_method_info(mode)) {
-    if (frames_array.is_null()) {
-      THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", NULL);
-    }
+  if (frames_array.is_null()) {
+    THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", NULL);
   }
 
   Klass* stackWalker_klass = SystemDictionary::StackWalker_klass();
@@ -313,48 +315,17 @@
   vframeStream& vfst = anchor.vframe_stream();
 
   {
-    // Skip all methods from AbstractStackWalker and StackWalk (enclosing method)
-    if (!fill_in_stacktrace(mode)) {
-      while (!vfst.at_end()) {
-        InstanceKlass* ik = vfst.method()->method_holder();
-        if (ik != stackWalker_klass &&
-              ik != abstractStackWalker_klass && ik->super() != abstractStackWalker_klass)  {
-          break;
-        }
-
-        if (TraceStackWalk) {
-          tty->print("  skip "); vfst.method()->print_short_name(); tty->print("\n");
-        }
-        vfst.next();
+    while (!vfst.at_end()) {
+      InstanceKlass* ik = vfst.method()->method_holder();
+      if (ik != stackWalker_klass &&
+            ik != abstractStackWalker_klass && ik->super() != abstractStackWalker_klass)  {
+        break;
       }
-    }
 
-    // For exceptions, skip Throwable::fillInStackTrace and <init> methods
-    // of the exception class and superclasses
-    if (fill_in_stacktrace(mode)) {
-      bool skip_to_fillInStackTrace = false;
-      bool skip_throwableInit_check = false;
-      while (!vfst.at_end() && !skip_throwableInit_check) {
-        InstanceKlass* ik = vfst.method()->method_holder();
-        Method* method = vfst.method();
-        if (!skip_to_fillInStackTrace) {
-          if (ik == SystemDictionary::Throwable_klass() &&
-              method->name() == vmSymbols::fillInStackTrace_name()) {
-              // this frame will be skipped
-              skip_to_fillInStackTrace = true;
-          }
-        } else if (!(ik->is_subclass_of(SystemDictionary::Throwable_klass()) &&
-                     method->name() == vmSymbols::object_initializer_name())) {
-            // there are none or we've seen them all - either way stop checking
-            skip_throwableInit_check = true;
-            break;
-        }
-
-        if (TraceStackWalk) {
-          tty->print("stack walk: skip "); vfst.method()->print_short_name(); tty->print("\n");
-        }
-        vfst.next();
+      if (TraceStackWalk) {
+        tty->print("  skip "); vfst.method()->print_short_name(); tty->print("\n");
       }
+      vfst.next();
     }
 
     // stack frame has been traversed individually and resume stack walk
@@ -372,7 +343,7 @@
   int end_index = start_index;
   int numFrames = 0;
   if (!vfst.at_end()) {
-    numFrames = fill_in_frames(mode, vfst, frame_count, start_index, classes_array,
+    numFrames = fill_in_frames(mode, vfst, frame_count, start_index,
                                frames_array, end_index, CHECK_NULL);
     if (numFrames < 1) {
       THROW_MSG_(vmSymbols::java_lang_InternalError(), "stack walk: decode failed", NULL);
@@ -392,12 +363,12 @@
   args.push_int(end_index);
 
   // Link the thread and vframe stream into the callee-visible object
-  anchor.setup_magic_on_entry(classes_array);
+  anchor.setup_magic_on_entry(frames_array);
 
   JavaCalls::call(&result, m_doStackWalk, &args, THREAD);
 
   // Do this before anything else happens, to disable any lingering stream objects
-  bool ok = anchor.cleanup_magic_on_exit(classes_array);
+  bool ok = anchor.cleanup_magic_on_exit(frames_array);
 
   // Throw pending exception if we must
   (void) (CHECK_NULL);
@@ -419,31 +390,28 @@
 //   magic          Must be valid value to continue the stack walk
 //   frame_count    Number of frames to be decoded.
 //   start_index    Start index to the user-supplied buffers.
-//   classes_array  Buffer to store classes in, starting at start_index.
 //   frames_array   Buffer to store StackFrame in, starting at start_index.
-//                  NULL if not used.
 //
 // Returns the end index of frame filled in the buffer.
 //
 jint StackWalk::moreFrames(Handle stackStream, jlong mode, jlong magic,
                            int frame_count, int start_index,
-                           objArrayHandle classes_array,
                            objArrayHandle frames_array,
                            TRAPS)
 {
   JavaThread* jt = (JavaThread*)THREAD;
-  StackWalkAnchor* existing_anchor = StackWalkAnchor::from_current(jt, magic, classes_array);
+  StackWalkAnchor* existing_anchor = StackWalkAnchor::from_current(jt, magic, frames_array);
   if (existing_anchor == NULL) {
     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers", 0L);
   }
 
-  if ((need_method_info(mode) || live_frame_info(mode)) && frames_array.is_null()) {
+  if (frames_array.is_null()) {
     THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", 0L);
   }
 
   if (TraceStackWalk) {
     tty->print_cr("StackWalk::moreFrames frame_count %d existing_anchor " PTR_FORMAT " start %d frames %d",
-                  frame_count, p2i(existing_anchor), start_index, classes_array->length());
+                  frame_count, p2i(existing_anchor), start_index, frames_array->length());
   }
   int end_index = start_index;
   if (frame_count <= 0) {
@@ -451,14 +419,14 @@
   }
 
   int count = frame_count + start_index;
-  assert (classes_array->length() >= count, "not enough space in buffers");
+  assert (frames_array->length() >= count, "not enough space in buffers");
 
   StackWalkAnchor& anchor = (*existing_anchor);
   vframeStream& vfst = anchor.vframe_stream();
   if (!vfst.at_end()) {
     vfst.next();  // this was the last frame decoded in the previous batch
     if (!vfst.at_end()) {
-      int n = fill_in_frames(mode, vfst, frame_count, start_index, classes_array,
+      int n = fill_in_frames(mode, vfst, frame_count, start_index,
                              frames_array, end_index, CHECK_0);
       if (n < 1) {
         THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: later decode failed", 0L);

--- a/hotspot/src/share/vm/prims/stackwalk.hpp	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/prims/stackwalk.hpp	Fri Apr 08 12:26:29 2016 -0700
@@ -45,12 +45,12 @@
   vframeStream&   vframe_stream()         { return _vfst; }
   JavaThread*     thread()                { return _thread; }
 
-  void setup_magic_on_entry(objArrayHandle classes_array);
-  bool check_magic(objArrayHandle classes_array);
-  bool cleanup_magic_on_exit(objArrayHandle classes_array);
+  void setup_magic_on_entry(objArrayHandle frames_array);
+  bool check_magic(objArrayHandle frames_array);
+  bool cleanup_magic_on_exit(objArrayHandle frames_array);
 
-  bool is_valid_in(Thread* thread, objArrayHandle classes_array) {
-    return (_thread == thread && check_magic(classes_array));
+  bool is_valid_in(Thread* thread, objArrayHandle frames_array) {
+    return (_thread == thread && check_magic(frames_array));
   }
 
   jlong address_value() {
@@ -64,7 +64,6 @@
 private:
   static int fill_in_frames(jlong mode, vframeStream& vfst,
                             int max_nframes, int start_index,
-                            objArrayHandle classes_array,
                             objArrayHandle frames_array,
                             int& end_index, TRAPS);
 
@@ -82,20 +81,18 @@
   static inline bool live_frame_info(int mode) {
     return (mode & JVM_STACKWALK_FILL_LIVE_STACK_FRAMES) != 0;
   }
-  static inline bool fill_in_stacktrace(int mode) {
-    return (mode & JVM_STACKWALK_FILTER_FILL_IN_STACK_TRACE) != 0;
-  }
 
 public:
+  static inline bool use_frames_array(int mode) {
+    return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;
+  }
   static oop walk(Handle stackStream, jlong mode,
                   int skip_frames, int frame_count, int start_index,
-                  objArrayHandle classes_array,
                   objArrayHandle frames_array,
                   TRAPS);
 
   static jint moreFrames(Handle stackStream, jlong mode, jlong magic,
                          int frame_count, int start_index,
-                         objArrayHandle classes_array,
                          objArrayHandle frames_array,
                          TRAPS);
 };

--- a/hotspot/src/share/vm/runtime/globals.hpp	Fri Apr 08 13:14:23 2016 +0200
+++ b/hotspot/src/share/vm/runtime/globals.hpp	Fri Apr 08 12:26:29 2016 -0700
@@ -2958,9 +2958,6 @@
   develop(bool, TraceStackWalk, false,                                      \
           "Trace stack walking")                                            \
                                                                             \
-  product(bool, MemberNameInStackFrame, true,                               \
-          "Use MemberName in StackFrame")                                   \
-                                                                            \
   /* notice: the max range value here is max_jint, not max_intx  */         \
   /* because of overflow issue                                   */         \
   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \