aoqi@0: /*
aoqi@0:  * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "code/codeCache.hpp"
aoqi@0: #include "memory/resourceArea.hpp"
aoqi@0: #include "runtime/deoptimization.hpp"
aoqi@0: #include "runtime/vmThread.hpp"
aoqi@0: #include "runtime/vm_operations.hpp"
aoqi@0: #include "services/dtraceAttacher.hpp"
aoqi@0: 
aoqi@0: #ifdef SOLARIS
aoqi@0: 
aoqi@0: class VM_DeoptimizeTheWorld : public VM_Operation {
aoqi@0:  public:
aoqi@0:   VMOp_Type type() const {
aoqi@0:     return VMOp_DeoptimizeTheWorld;
aoqi@0:   }
aoqi@0:   void doit() {
aoqi@0:     CodeCache::mark_all_nmethods_for_deoptimization();
aoqi@0:     ResourceMark rm;
aoqi@0:     DeoptimizationMarker dm;
aoqi@0:     // Deoptimize all activations depending on marked methods
aoqi@0:     Deoptimization::deoptimize_dependents();
aoqi@0: 
aoqi@0:     // Mark the dependent methods non entrant
aoqi@0:     CodeCache::make_marked_nmethods_not_entrant();
aoqi@0:   }
aoqi@0: };
aoqi@0: 
aoqi@0: static void set_bool_flag(const char* flag, bool value) {
aoqi@0:   CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,
aoqi@0:                               Flag::ATTACH_ON_DEMAND);
aoqi@0: }
aoqi@0: 
aoqi@0: // Enable only the "fine grained" flags. Do *not* touch
aoqi@0: // the overall "ExtendedDTraceProbes" flag.
aoqi@0: void DTrace::enable_dprobes(int probes) {
aoqi@0:   bool changed = false;
aoqi@0:   if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
aoqi@0:     set_bool_flag("DTraceAllocProbes", true);
aoqi@0:     changed = true;
aoqi@0:   }
aoqi@0:   if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
aoqi@0:     set_bool_flag("DTraceMethodProbes", true);
aoqi@0:     changed = true;
aoqi@0:   }
aoqi@0:   if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
aoqi@0:     set_bool_flag("DTraceMonitorProbes", true);
aoqi@0:     changed = true;
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (changed) {
aoqi@0:     // one or more flags changed, need to deoptimize
aoqi@0:     VM_DeoptimizeTheWorld op;
aoqi@0:     VMThread::execute(&op);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: // Disable only the "fine grained" flags. Do *not* touch
aoqi@0: // the overall "ExtendedDTraceProbes" flag.
aoqi@0: void DTrace::disable_dprobes(int probes) {
aoqi@0:   bool changed = false;
aoqi@0:   if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
aoqi@0:     set_bool_flag("DTraceAllocProbes", false);
aoqi@0:     changed = true;
aoqi@0:   }
aoqi@0:   if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
aoqi@0:     set_bool_flag("DTraceMethodProbes", false);
aoqi@0:     changed = true;
aoqi@0:   }
aoqi@0:   if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
aoqi@0:     set_bool_flag("DTraceMonitorProbes", false);
aoqi@0:     changed = true;
aoqi@0:   }
aoqi@0:   if (changed) {
aoqi@0:     // one or more flags changed, need to deoptimize
aoqi@0:     VM_DeoptimizeTheWorld op;
aoqi@0:     VMThread::execute(&op);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: // Do clean-up on "all door clients detached" event.
aoqi@0: void DTrace::detach_all_clients() {
aoqi@0:   /*
aoqi@0:    * We restore the state of the fine grained flags
aoqi@0:    * to be consistent with overall ExtendedDTraceProbes.
aoqi@0:    * This way, we will honour command line setting or the
aoqi@0:    * last explicit modification of ExtendedDTraceProbes by
aoqi@0:    * a call to set_extended_dprobes.
aoqi@0:    */
aoqi@0:   if (ExtendedDTraceProbes) {
aoqi@0:     enable_dprobes(DTRACE_ALL_PROBES);
aoqi@0:   } else {
aoqi@0:     disable_dprobes(DTRACE_ALL_PROBES);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void DTrace::set_extended_dprobes(bool flag) {
aoqi@0:   // explicit setting of ExtendedDTraceProbes flag
aoqi@0:   set_bool_flag("ExtendedDTraceProbes", flag);
aoqi@0: 
aoqi@0:   // make sure that the fine grained flags reflect the change.
aoqi@0:   if (flag) {
aoqi@0:     enable_dprobes(DTRACE_ALL_PROBES);
aoqi@0:   } else {
aoqi@0:     /*
aoqi@0:      * FIXME: Revisit this: currently all-client-detach detection
aoqi@0:      * does not work and hence disabled. The following scheme does
aoqi@0:      * not work. So, we have to disable fine-grained flags here.
aoqi@0:      *
aoqi@0:      * disable_dprobes call has to be delayed till next "detach all "event.
aoqi@0:      * This is to be  done so that concurrent DTrace clients that may
aoqi@0:      * have enabled one or more fine grained dprobes and may be running
aoqi@0:      * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
aoqi@0:      * with  fine grained flags which would take care of disabling fine grained flags.
aoqi@0:      */
aoqi@0:     disable_dprobes(DTRACE_ALL_PROBES);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void DTrace::set_monitor_dprobes(bool flag) {
aoqi@0:   // explicit setting of DTraceMonitorProbes flag
aoqi@0:   set_bool_flag("DTraceMonitorProbes", flag);
aoqi@0: }
aoqi@0: 
aoqi@0: #endif /* SOLARIS */