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Java example source code file (thread_linux_zero.hpp)

This example Java source code file (thread_linux_zero.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytesize, java, javaframeanchor\:\:last_java_fp_offset, null, os_cpu_linux_zero_vm_thread_linux_zero_hpp, shouldnotcallthis, zeroframe, zerostack

The thread_linux_zero.hpp Java example source code

/*
 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2007, 2008, 2009, 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.
 *
 * 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.
 *
 */

#ifndef OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
#define OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP

 private:
  ZeroStack  _zero_stack;
  ZeroFrame* _top_zero_frame;

  void pd_initialize() {
    _top_zero_frame = NULL;
  }

 public:
  ZeroStack *zero_stack() {
    return &_zero_stack;
  }

 public:
  ZeroFrame *top_zero_frame() {
    return _top_zero_frame;
  }
  void push_zero_frame(ZeroFrame *frame) {
    *(ZeroFrame **) frame = _top_zero_frame;
    _top_zero_frame = frame;
  }
  void pop_zero_frame() {
    zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1);
    _top_zero_frame = *(ZeroFrame **) _top_zero_frame;
  }

 public:
  static ByteSize zero_stack_offset() {
    return byte_offset_of(JavaThread, _zero_stack);
  }
  static ByteSize top_zero_frame_offset() {
    return byte_offset_of(JavaThread, _top_zero_frame);
  }

 public:
  void record_base_of_stack_pointer() {
    assert(top_zero_frame() == NULL, "junk on stack prior to Java call");
  }
  void set_base_of_stack_pointer(intptr_t* base_sp) {
    assert(base_sp == NULL, "should be");
    assert(top_zero_frame() == NULL, "junk on stack after Java call");
  }

 public:
  void set_last_Java_frame() {
    set_last_Java_frame(top_zero_frame(), zero_stack()->sp());
  }
  void reset_last_Java_frame() {
    frame_anchor()->zap();
  }
  void set_last_Java_frame(ZeroFrame* fp, intptr_t* sp) {
    frame_anchor()->set(sp, NULL, fp);
  }

 public:
  ZeroFrame* last_Java_fp() {
    return frame_anchor()->last_Java_fp();
  }

 private:
  frame pd_last_frame() {
    assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
    return frame(last_Java_fp(), last_Java_sp());
  }

 public:
  static ByteSize last_Java_fp_offset() {
    return byte_offset_of(JavaThread, _anchor) +
      JavaFrameAnchor::last_Java_fp_offset();
  }

 public:
  // Check for pending suspend requests and pending asynchronous
  // exceptions.  There are separate accessors for these, but
  // _suspend_flags is volatile so using them would be unsafe.
  bool has_special_condition_for_native_trans() {
    return _suspend_flags != 0;
  }

 public:
  bool pd_get_top_frame_for_signal_handler(frame* fr_addr,
                                           void* ucontext,
                                           bool isInJava) {
    ShouldNotCallThis();
  }

  // These routines are only used on cpu architectures that
  // have separate register stacks (Itanium).
  static bool register_stack_overflow() { return false; }
  static void enable_register_stack_guard() {}
  static void disable_register_stack_guard() {}

#endif // OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP

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