/*

 * 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 "code/codeCache.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/deoptimization.hpp"

#include "runtime/vmThread.hpp"

#include "runtime/vm_operations.hpp"

#include "services/dtraceAttacher.hpp"

#ifdef SOLARIS

class VM_DeoptimizeTheWorld : public VM_Operation {

 public:

  VMOp_Type type() const {

    return VMOp_DeoptimizeTheWorld;

  }

  void doit() {

    CodeCache::mark_all_nmethods_for_deoptimization();

    ResourceMark rm;

    DeoptimizationMarker dm;

    // Deoptimize all activations depending on marked methods

    Deoptimization::deoptimize_dependents();

    // Mark the dependent methods non entrant

    CodeCache::make_marked_nmethods_not_entrant();

  }

};

static void set_bool_flag(const char* flag, bool value) {

  CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,

                              Flag::ATTACH_ON_DEMAND);

}

// Enable only the "fine grained" flags. Do *not* touch

// the overall "ExtendedDTraceProbes" flag.

void DTrace::enable_dprobes(int probes) {

  bool changed = false;

  if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {

    set_bool_flag("DTraceAllocProbes", true);

    changed = true;

  }

  if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {

    set_bool_flag("DTraceMethodProbes", true);

    changed = true;

  }

  if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {

    set_bool_flag("DTraceMonitorProbes", true);

    changed = true;

  }

  if (changed) {

    // one or more flags changed, need to deoptimize

    VM_DeoptimizeTheWorld op;

    VMThread::execute(&op);

  }

}

// Disable only the "fine grained" flags. Do *not* touch

// the overall "ExtendedDTraceProbes" flag.

void DTrace::disable_dprobes(int probes) {

  bool changed = false;

  if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {

    set_bool_flag("DTraceAllocProbes", false);

    changed = true;

  }

  if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {

    set_bool_flag("DTraceMethodProbes", false);

    changed = true;

  }

  if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {

    set_bool_flag("DTraceMonitorProbes", false);

    changed = true;

  }

  if (changed) {

    // one or more flags changed, need to deoptimize

    VM_DeoptimizeTheWorld op;

    VMThread::execute(&op);

  }

}

// Do clean-up on "all door clients detached" event.

void DTrace::detach_all_clients() {

  /*

   * We restore the state of the fine grained flags

   * to be consistent with overall ExtendedDTraceProbes.

   * This way, we will honour command line setting or the

   * last explicit modification of ExtendedDTraceProbes by

   * a call to set_extended_dprobes.

   */

  if (ExtendedDTraceProbes) {

    enable_dprobes(DTRACE_ALL_PROBES);

  } else {

    disable_dprobes(DTRACE_ALL_PROBES);

  }

}

void DTrace::set_extended_dprobes(bool flag) {

  // explicit setting of ExtendedDTraceProbes flag

  set_bool_flag("ExtendedDTraceProbes", flag);

  // make sure that the fine grained flags reflect the change.

  if (flag) {

    enable_dprobes(DTRACE_ALL_PROBES);

  } else {

    /*

     * FIXME: Revisit this: currently all-client-detach detection

     * does not work and hence disabled. The following scheme does

     * not work. So, we have to disable fine-grained flags here.

     *

     * disable_dprobes call has to be delayed till next "detach all "event.

     * This is to be  done so that concurrent DTrace clients that may

     * have enabled one or more fine grained dprobes and may be running

     * still. On "detach all" clients event, we would sync ExtendedDTraceProbes

     * with  fine grained flags which would take care of disabling fine grained flags.

     */

    disable_dprobes(DTRACE_ALL_PROBES);

  }

}

void DTrace::set_monitor_dprobes(bool flag) {

  // explicit setting of DTraceMonitorProbes flag

  set_bool_flag("DTraceMonitorProbes", flag);

}

#endif /* SOLARIS */