/*

 * 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 + 2);

  }

  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;

  }

  // At this point, we don't have a last_Java_frame, so

  // we try to glean some information out of the ucontext

  // if we were running Java code when SIGPROF came in.

  if (isInJava) {

    ucontext_t* uc = (ucontext_t*) ucontext;

    frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],

                     (address)uc->uc_mcontext.regs->nip);

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

      // ucontext wasn't useful

      return false;

    }

    if (ret_frame.is_interpreted_frame()) {

       frame::ijava_state* istate = ret_frame.get_ijava_state();

       if (MetaspaceObj::is_valid((Method*)(istate->method)) == false) {

         return false;

       }

       uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/];

       uint64_t istate_bcp = istate->bcp;

       uint64_t code_start = (uint64_t)(((Method*)(istate->method))->code_base());

       uint64_t code_end = (uint64_t)(((Method*)istate->method)->code_base() + ((Method*)istate->method)->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;

}

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() { }