--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/code/scopeDesc.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,259 @@
+/*
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "code/debugInfoRec.hpp"
+#include "code/pcDesc.hpp"
+#include "code/scopeDesc.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/handles.inline.hpp"
+
+ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool rethrow_exception, bool return_oop) {
+  _code          = code;
+  _decode_offset = decode_offset;
+  _objects       = decode_object_values(obj_decode_offset);
+  _reexecute     = reexecute;
+  _rethrow_exception = rethrow_exception;
+  _return_oop    = return_oop;
+  decode_body();
+}
+
+ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, bool reexecute, bool rethrow_exception, bool return_oop) {
+  _code          = code;
+  _decode_offset = decode_offset;
+  _objects       = decode_object_values(DebugInformationRecorder::serialized_null);
+  _reexecute     = reexecute;
+  _rethrow_exception = rethrow_exception;
+  _return_oop    = return_oop;
+  decode_body();
+}
+
+
+ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
+  _code          = parent->_code;
+  _decode_offset = parent->_sender_decode_offset;
+  _objects       = parent->_objects;
+  _reexecute     = false; //reexecute only applies to the first scope
+  _rethrow_exception = false;
+  _return_oop    = false;
+  decode_body();
+}
+
+
+void ScopeDesc::decode_body() {
+  if (decode_offset() == DebugInformationRecorder::serialized_null) {
+    // This is a sentinel record, which is only relevant to
+    // approximate queries.  Decode a reasonable frame.
+    _sender_decode_offset = DebugInformationRecorder::serialized_null;
+    _method = _code->method();
+    _bci = InvocationEntryBci;
+    _locals_decode_offset = DebugInformationRecorder::serialized_null;
+    _expressions_decode_offset = DebugInformationRecorder::serialized_null;
+    _monitors_decode_offset = DebugInformationRecorder::serialized_null;
+  } else {
+    // decode header
+    DebugInfoReadStream* stream  = stream_at(decode_offset());
+
+    _sender_decode_offset = stream->read_int();
+    _method = stream->read_method();
+    _bci    = stream->read_bci();
+
+    // decode offsets for body and sender
+    _locals_decode_offset      = stream->read_int();
+    _expressions_decode_offset = stream->read_int();
+    _monitors_decode_offset    = stream->read_int();
+  }
+}
+
+
+GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
+  if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
+  DebugInfoReadStream* stream = stream_at(decode_offset);
+  int length = stream->read_int();
+  GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
+  for (int index = 0; index < length; index++) {
+    result->push(ScopeValue::read_from(stream));
+  }
+  return result;
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
+  if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
+  GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
+  DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
+  int length = stream->read_int();
+  for (int index = 0; index < length; index++) {
+    // Objects values are pushed to 'result' array during read so that
+    // object's fields could reference it (OBJECT_ID_CODE).
+    (void)ScopeValue::read_from(stream);
+  }
+  assert(result->length() == length, "inconsistent debug information");
+  return result;
+}
+
+
+GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
+  if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
+  DebugInfoReadStream* stream  = stream_at(decode_offset);
+  int length = stream->read_int();
+  GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
+  for (int index = 0; index < length; index++) {
+    result->push(new MonitorValue(stream));
+  }
+  return result;
+}
+
+DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
+  return new DebugInfoReadStream(_code, decode_offset, _objects);
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::locals() {
+  return decode_scope_values(_locals_decode_offset);
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
+  return decode_scope_values(_expressions_decode_offset);
+}
+
+GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
+  return decode_monitor_values(_monitors_decode_offset);
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::objects() {
+  return _objects;
+}
+
+bool ScopeDesc::is_top() const {
+ return _sender_decode_offset == DebugInformationRecorder::serialized_null;
+}
+
+ScopeDesc* ScopeDesc::sender() const {
+  if (is_top()) return NULL;
+  return new ScopeDesc(this);
+}
+
+
+#ifndef PRODUCT
+
+void ScopeDesc::print_value_on(outputStream* st) const {
+  st->print("  ");
+  method()->print_short_name(st);
+  int lineno = method()->line_number_from_bci(bci());
+  if (lineno != -1) {
+    st->print("@%d (line %d)", bci(), lineno);
+  } else {
+    st->print("@%d", bci());
+  }
+  if (should_reexecute()) {
+    st->print("  reexecute=true");
+  }
+  st->cr();
+}
+
+void ScopeDesc::print_on(outputStream* st) const {
+  print_on(st, NULL);
+}
+
+void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
+  // header
+  if (pd != NULL) {
+    st->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", p2i(pd->real_pc(_code)), pd->pc_offset());
+  }
+
+  print_value_on(st);
+  // decode offsets
+  if (WizardMode) {
+    st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, p2i(_code->content_begin()));
+    st->print_cr(" offset:     %d",    _decode_offset);
+    st->print_cr(" bci:        %d",    bci());
+    st->print_cr(" reexecute:  %s",    should_reexecute() ? "true" : "false");
+    st->print_cr(" locals:     %d",    _locals_decode_offset);
+    st->print_cr(" stack:      %d",    _expressions_decode_offset);
+    st->print_cr(" monitor:    %d",    _monitors_decode_offset);
+    st->print_cr(" sender:     %d",    _sender_decode_offset);
+  }
+  // locals
+  { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
+    if (l != NULL) {
+      st->print_cr("   Locals");
+      for (int index = 0; index < l->length(); index++) {
+        st->print("    - l%d: ", index);
+        l->at(index)->print_on(st);
+        st->cr();
+      }
+    }
+  }
+  // expressions
+  { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
+    if (l != NULL) {
+      st->print_cr("   Expression stack");
+      for (int index = 0; index < l->length(); index++) {
+        st->print("    - @%d: ", index);
+        l->at(index)->print_on(st);
+        st->cr();
+      }
+    }
+  }
+  // monitors
+  { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
+    if (l != NULL) {
+      st->print_cr("   Monitor stack");
+      for (int index = 0; index < l->length(); index++) {
+        st->print("    - @%d: ", index);
+        l->at(index)->print_on(st);
+        st->cr();
+      }
+    }
+  }
+
+#if defined(COMPILER2) || INCLUDE_JVMCI
+  if (NOT_JVMCI(DoEscapeAnalysis &&) is_top() && _objects != NULL) {
+    st->print_cr("   Objects");
+    for (int i = 0; i < _objects->length(); i++) {
+      ObjectValue* sv = (ObjectValue*) _objects->at(i);
+      st->print("    - %d: ", sv->id());
+      st->print("%s ", java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())->external_name());
+      sv->print_fields_on(st);
+      st->cr();
+    }
+  }
+#endif // COMPILER2 || INCLUDE_JVMCI
+}
+
+#endif
+
+void ScopeDesc::verify() {
+  ResourceMark rm;
+  guarantee(method()->is_method(), "type check");
+
+  // check if we have any illegal elements on the expression stack
+  { GrowableArray<ScopeValue*>* l = expressions();
+    if (l != NULL) {
+      for (int index = 0; index < l->length(); index++) {
+       //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
+      }
+    }
+  }
+}