/*

 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016, 2019 SAP SE. 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 "runtime/frame.inline.hpp"

#include "runtime/thread.hpp"

frame JavaThread::pd_last_frame() {

  assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");

  intptr_t* sp = last_Java_sp();

  address pc = _anchor.last_Java_pc();

  // Last_Java_pc ist not set if we come here from compiled code.

  if (pc == NULL) {

    pc = (address) *(sp + 14);

  }

  return frame(sp, pc);

}

bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {

  assert(this->is_Java_thread(), "must be JavaThread");

  // If we have a last_Java_frame, then we should use it even if

  // isInJava == true.  It should be more reliable than ucontext info.

  if (has_last_Java_frame() && frame_anchor()->walkable()) {

    *fr_addr = pd_last_frame();

    return true;

  }

  if (isInJava) {

    ucontext_t* uc = (ucontext_t*) ucontext;

    frame ret_frame((intptr_t*)uc->uc_mcontext.gregs[15/*Z_SP*/],

                   (address)uc->uc_mcontext.psw.addr);

    if (ret_frame.pc() == NULL) {

      // ucontext wasn't useful

      return false;

    }

    if (ret_frame.is_interpreted_frame()) {

      frame::z_ijava_state* istate = ret_frame.ijava_state_unchecked();

      if (stack_base() >= (address)istate && (address)istate > stack_end()) {

        return false;

      }

      const Method *m = (const Method*)(istate->method);

      if (!Method::is_valid_method(m)) return false;

      if (!Metaspace::contains(m->constMethod())) return false;

      uint64_t reg_bcp = uc->uc_mcontext.gregs[13/*Z_BCP*/];

      uint64_t istate_bcp = istate->bcp;

      uint64_t code_start = (uint64_t)(m->code_base());

      uint64_t code_end = (uint64_t)(m->code_base() + m->code_size());

      if (istate_bcp >= code_start && istate_bcp < code_end) {

        // we have a valid bcp, don't touch it, do nothing

      } else if (reg_bcp >= code_start && reg_bcp < code_end) {

        istate->bcp = reg_bcp;

      } else {

        return false;

      }

    }

    if (!ret_frame.safe_for_sender(this)) {

      // nothing else to try if the frame isn't good

      return false;

    }

    *fr_addr = ret_frame;

    return true;

  }

  // nothing else to try

  return false;

}

// Forte Analyzer AsyncGetCallTrace profiling support.

bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) {

  return pd_get_top_frame_for_profiling(fr_addr, ucontext, isInJava);

}

void JavaThread::cache_global_variables() { }