Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: scopeDesc.cpp Sprache: C

/*
* Copyright (c) 1997, 2020, 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 "classfile/javaClasses.inline.hpp"
#include "code/debugInfoRec.hpp"
#include "code/pcDesc.hpp"
#include "code/scopeDesc.hpp"
#include "compiler/compiler_globals.hpp"
#include "memory/resourceArea.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/handles.inline.hpp"

ScopeDesc::ScopeDesc(const CompiledMethod* code, PcDesc* pd, bool ignore_objects) {
  int obj_decode_offset = ignore_objects ? DebugInformationRecorder::serialized_null : pd->obj_decode_offset();
  _code          = code;
  _decode_offset = pd->scope_decode_offset();
  _objects       = decode_object_values(obj_decode_offset);
  _reexecute     = pd->should_reexecute();
  _rethrow_exception = pd->rethrow_exception();
  _return_oop    = pd->return_oop();
  _has_ea_local_in_scope = ignore_objects ? false : pd->has_ea_local_in_scope();
  _arg_escape    = ignore_objects ? false : pd->arg_escape();
  decode_body();
}

void ScopeDesc::initialize(const ScopeDesc* parent, int decode_offset) {
  _code          = parent->_code;
  _decode_offset = decode_offset;
  _objects       = parent->_objects;
  _reexecute     = false; //reexecute only applies to the first scope
  _rethrow_exception = false;
  _return_oop    = false;
  _has_ea_local_in_scope = parent->has_ea_local_in_scope();
  _arg_escape    = false;
  decode_body();
}

ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
  initialize(parent, parent->_sender_decode_offset);
}

ScopeDesc::ScopeDesc(const ScopeDesc* parent, int decode_offset) {
  initialize(parent, decode_offset);
}

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 COMPILER2_OR_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_OR_JVMCI
}

#endif

void ScopeDesc::verify() {
  Thread* current_thread = Thread::current();
  ResourceMark rm(current_thread);
  HandleMark hm(current_thread);
  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");
      }
    }
  }
}

¤ Dauer der Verarbeitung: 0.31 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.