jdk

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/*
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 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2009, 2021, Red Hat, Inc. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/javaThread.hpp"
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frame JavaThread::pd_last_frame() {
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  assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
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  return frame(last_Java_fp(), last_Java_sp());
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}
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void JavaThread::cache_global_variables() {
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  // nothing to do
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}
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bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
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                                         void* ucontext,
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                                         bool isInJava) {
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  if (has_last_Java_frame()) {
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    *fr_addr = pd_last_frame();
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    return true;
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  }
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  if (isInJava) {
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    // We know we are in Java, but there is no frame?
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    // Try to find the top-most Java frame on Zero stack then.
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    intptr_t* sp = zero_stack()->sp();
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    ZeroFrame* zf = top_zero_frame();
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    while (zf != nullptr) {
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      if (zf->is_interpreter_frame()) {
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        interpreterState istate = zf->as_interpreter_frame()->interpreter_state();
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        if (istate->self_link() == istate) {
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          // Valid interpreter state found, this is our frame.
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          *fr_addr = frame(zf, sp);
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          return true;
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        }
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      }
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      sp = ((intptr_t *) zf) + 1;
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      zf = zf->next();
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    }
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  }
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  // No dice.
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  return false;
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}
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bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr,
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                                    void* ucontext,
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                                    bool isInJava) {
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  return pd_get_top_frame_for_signal_handler(fr_addr, ucontext, isInJava);
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}
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