Quelle javaFrameAnchor_zero.hpp Sprache: C

/*
* Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright 2007, 2008, 2010 Red Hat, Inc.
* 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.
*
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*/

#ifndef CPU_ZERO_JAVAFRAMEANCHOR_ZERO_HPP
#define CPU_ZERO_JAVAFRAMEANCHOR_ZERO_HPP

private:
  ZeroFrame* volatile _last_Java_fp;

public:
  // Each arch must define reset, save, restore
  // These are used by objects that only care about:
  //  1 - initializing a new state (thread creation, javaCalls)
  //  2 - saving a current state (javaCalls)
  //  3 - restoring an old state (javaCalls)
  // Note that whenever _last_Java_sp != NULL other anchor fields
  // must be valid.  The profiler apparently depends on this.

  void clear() {
    // clearing _last_Java_sp must be first
    _last_Java_sp = NULL;
    // fence?
    _last_Java_fp = NULL;
    _last_Java_pc = NULL;
  }

  void copy(JavaFrameAnchor* src) {
    set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);
  }

  void set(intptr_t* sp, address pc, ZeroFrame* fp) {
    // In order to make sure the transition state is valid for "this"
    // We must clear _last_Java_sp before copying the rest of the new
    // data
    //
    // Hack Alert: Temporary bugfix for 4717480/4721647 To act like
    // previous version (pd_cache_state) don't NULL _last_Java_sp
    // unless the value is changing
    //
    if (_last_Java_sp != sp)
      _last_Java_sp = NULL;

    _last_Java_fp = fp;
    _last_Java_pc = pc;
    // Must be last so profiler will always see valid frame if
    // has_last_frame() is true
    _last_Java_sp = sp;
  }

  bool walkable() {
    return true;
  }

  void make_walkable() {
    // nothing to do
  }

  intptr_t* last_Java_sp() const {
    return _last_Java_sp;
  }

  ZeroFrame* last_Java_fp() const {
    return _last_Java_fp;
  }

  address last_Java_pc() const {
    return _last_Java_pc;
  }

  static ByteSize last_Java_fp_offset() {
    return byte_offset_of(JavaFrameAnchor, _last_Java_fp);
  }

  void set_last_Java_sp(intptr_t* sp)   { _last_Java_sp = sp; }

#endif // CPU_ZERO_JAVAFRAMEANCHOR_ZERO_HPP

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