jdk

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/*
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 * Copyright (c) 2003, 2023, Oracle and/or its affiliates. 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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  vmassert(_anchor.last_Java_pc() != nullptr, "not walkable");
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  return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
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}
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// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
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// currently interrupted by SIGPROF
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bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
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  void* ucontext, bool isInJava) {
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  assert(Thread::current() == this, "caller must be current thread");
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  return pd_get_top_frame(fr_addr, ucontext, isInJava);
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}
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bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
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  return pd_get_top_frame(fr_addr, ucontext, isInJava);
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}
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bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
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  // If we have a last_Java_frame, then we should use it even if
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  // isInJava == true.  It should be more reliable than ucontext info.
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  if (has_last_Java_frame() && frame_anchor()->walkable()) {
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    *fr_addr = pd_last_frame();
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    return true;
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  }
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  // At this point, we don't have a last_Java_frame, so
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  // we try to glean some information out of the ucontext
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  // if we were running Java code when SIGPROF came in.
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  if (isInJava) {
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    ucontext_t* uc = (ucontext_t*) ucontext;
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    intptr_t* ret_fp;
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    intptr_t* ret_sp;
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    address addr = os::fetch_frame_from_context(uc, &ret_sp, &ret_fp);
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    if (addr == nullptr || ret_sp == nullptr ) {
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      // ucontext wasn't useful
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      return false;
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    }
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    frame ret_frame(ret_sp, ret_fp, addr);
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    if (!ret_frame.safe_for_sender(this)) {
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#if COMPILER2_OR_JVMCI
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      // C2 and JVMCI use ebp as a general register see if null fp helps
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      frame ret_frame2(ret_sp, nullptr, addr);
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      if (!ret_frame2.safe_for_sender(this)) {
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        // nothing else to try if the frame isn't good
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        return false;
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      }
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      ret_frame = ret_frame2;
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#else
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      // nothing else to try if the frame isn't good
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      return false;
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#endif // COMPILER2_OR_JVMCI
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    }
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    *fr_addr = ret_frame;
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    return true;
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  }
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  // nothing else to try
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  return false;
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}
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void JavaThread::cache_global_variables() { }
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