1 /*
   2  * Copyright (c) 2006, 2007, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 # include "incls/_precompiled.incl"
  26 # include "incls/_dtraceAttacher.cpp.incl"
  27 
  28 #ifdef SOLARIS
  29 
  30 class VM_DeoptimizeTheWorld : public VM_Operation {
  31  public:
  32   VMOp_Type type() const {
  33     return VMOp_DeoptimizeTheWorld;
  34   }
  35   void doit() {
  36     CodeCache::mark_all_nmethods_for_deoptimization();
  37     ResourceMark rm;
  38     DeoptimizationMarker dm;
  39     // Deoptimize all activations depending on marked methods
  40     Deoptimization::deoptimize_dependents();
  41 
  42     // Mark the dependent methods non entrant
  43     CodeCache::make_marked_nmethods_not_entrant();
  44   }
  45 };
  46 
  47 static void set_bool_flag(const char* flag, bool value) {
  48   CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,
  49                               ATTACH_ON_DEMAND);
  50 }
  51 
  52 // Enable only the "fine grained" flags. Do *not* touch
  53 // the overall "ExtendedDTraceProbes" flag.
  54 void DTrace::enable_dprobes(int probes) {
  55   bool changed = false;
  56   if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
  57     set_bool_flag("DTraceAllocProbes", true);
  58     changed = true;
  59   }
  60   if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
  61     set_bool_flag("DTraceMethodProbes", true);
  62     changed = true;
  63   }
  64   if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
  65     set_bool_flag("DTraceMonitorProbes", true);
  66     changed = true;
  67   }
  68 
  69   if (changed) {
  70     // one or more flags changed, need to deoptimize
  71     VM_DeoptimizeTheWorld op;
  72     VMThread::execute(&op);
  73   }
  74 }
  75 
  76 // Disable only the "fine grained" flags. Do *not* touch
  77 // the overall "ExtendedDTraceProbes" flag.
  78 void DTrace::disable_dprobes(int probes) {
  79   bool changed = false;
  80   if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
  81     set_bool_flag("DTraceAllocProbes", false);
  82     changed = true;
  83   }
  84   if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
  85     set_bool_flag("DTraceMethodProbes", false);
  86     changed = true;
  87   }
  88   if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
  89     set_bool_flag("DTraceMonitorProbes", false);
  90     changed = true;
  91   }
  92   if (changed) {
  93     // one or more flags changed, need to deoptimize
  94     VM_DeoptimizeTheWorld op;
  95     VMThread::execute(&op);
  96   }
  97 }
  98 
  99 // Do clean-up on "all door clients detached" event.
 100 void DTrace::detach_all_clients() {
 101   /*
 102    * We restore the state of the fine grained flags
 103    * to be consistent with overall ExtendedDTraceProbes.
 104    * This way, we will honour command line setting or the
 105    * last explicit modification of ExtendedDTraceProbes by
 106    * a call to set_extended_dprobes.
 107    */
 108   if (ExtendedDTraceProbes) {
 109     enable_dprobes(DTRACE_ALL_PROBES);
 110   } else {
 111     disable_dprobes(DTRACE_ALL_PROBES);
 112   }
 113 }
 114 
 115 void DTrace::set_extended_dprobes(bool flag) {
 116   // explicit setting of ExtendedDTraceProbes flag
 117   set_bool_flag("ExtendedDTraceProbes", flag);
 118 
 119   // make sure that the fine grained flags reflect the change.
 120   if (flag) {
 121     enable_dprobes(DTRACE_ALL_PROBES);
 122   } else {
 123     /*
 124      * FIXME: Revisit this: currently all-client-detach detection
 125      * does not work and hence disabled. The following scheme does
 126      * not work. So, we have to disable fine-grained flags here.
 127      *
 128      * disable_dprobes call has to be delayed till next "detach all "event.
 129      * This is to be  done so that concurrent DTrace clients that may
 130      * have enabled one or more fine grained dprobes and may be running
 131      * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
 132      * with  fine grained flags which would take care of disabling fine grained flags.
 133      */
 134     disable_dprobes(DTRACE_ALL_PROBES);
 135   }
 136 }
 137 
 138 void DTrace::set_monitor_dprobes(bool flag) {
 139   // explicit setting of DTraceMonitorProbes flag
 140   set_bool_flag("DTraceMonitorProbes", flag);
 141 }
 142 
 143 #endif /* SOLARIS */