1 /*

     2  * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_dtraceJSDT.cpp.incl"

    27 

    28 #ifdef HAVE_DTRACE_H

    29 

    30 jlong DTraceJSDT::activate(

    31     jint version, jstring module_name, jint providers_count,

    32     JVM_DTraceProvider* providers, TRAPS) {

    33 

    34   size_t count = 0;

    35   RegisteredProbes* probes = NULL;

    36 

    37   if (!is_supported()) {

    38     return 0;

    39   }

    40 

    41   assert(module_name != NULL, "valid module name");

    42   assert(providers != NULL, "valid provider array");

    43 

    44   for (int i = 0; i < providers_count; ++i) {

    45     count += providers[i].probe_count;

    46   }

    47   probes = new RegisteredProbes(count);

    48   count = 0;

    49 

    50   for (int i = 0; i < providers_count; ++i) {

    51     assert(providers[i].name != NULL, "valid provider name");

    52     assert(providers[i].probe_count == 0 || providers[i].probes != NULL,

    53            "valid probe count");

    54     for (int j = 0; j < providers[i].probe_count; ++j) {

    55       JVM_DTraceProbe* probe = &(providers[i].probes[j]);

    56       assert(probe != NULL, "valid probe");

    57       assert(probe->method != NULL, "valid method");

    58       assert(probe->name != NULL, "valid probe name");

    59       assert(probe->function != NULL, "valid probe function spec");

    60       methodHandle h_method =

    61         methodHandle(THREAD, JNIHandles::resolve_jmethod_id(probe->method));

    62       nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method);

    63       h_method()->set_not_compilable(CompLevel_highest_tier);

    64       h_method()->set_code(h_method, nm);

    65       probes->nmethod_at_put(count++, nm);

    66     }

    67   }

    68 

    69   int handle = pd_activate((void*)probes,

    70     module_name, providers_count, providers);

    71   if (handle <= 0) {

    72     delete probes;

    73     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),

    74       "Unable to register DTrace probes (internal error).");

    75   }

    76   probes->set_helper_handle(handle);

    77   return RegisteredProbes::toOpaqueProbes(probes);

    78 }

    79 

    80 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {

    81   methodOop m = JNIHandles::resolve_jmethod_id(method);

    82   return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap();

    83 }

    84 

    85 void DTraceJSDT::dispose(OpaqueProbes probes) {

    86   RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes);

    87   if (probes != -1 && p != NULL) {

    88     pd_dispose(p->helper_handle());

    89     delete p;

    90   }

    91 }

    92 

    93 jboolean DTraceJSDT::is_supported() {

    94   return pd_is_supported();

    95 }

    96 

    97 #else // HAVE_DTRACE_H

    98 

    99 jlong DTraceJSDT::activate(

   100     jint version, jstring module_name, jint providers_count,

   101     JVM_DTraceProvider* providers, TRAPS) {

   102   return 0;

   103 }

   104 

   105 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {

   106   return false;

   107 }

   108 

   109 void DTraceJSDT::dispose(OpaqueProbes probes) {

   110   return;

   111 }

   112 

   113 jboolean DTraceJSDT::is_supported() {

   114   return false;

   115 }

   116 

   117 #endif // ndef HAVE_DTRACE_H