1 /*

     2  * Copyright (c) 1997, 2012, 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 "precompiled.hpp"

    26 #include "classfile/javaClasses.hpp"

    27 #include "code/codeBlob.hpp"

    28 #include "code/nativeInst.hpp"

    29 #include "memory/allocation.hpp"

    30 #include "prims/jvm.h"

    31 #include "runtime/dtraceJSDT.hpp"

    32 #include "runtime/jniHandles.hpp"

    33 #include "runtime/os.hpp"

    34 #include "utilities/exceptions.hpp"

    35 #include "utilities/globalDefinitions.hpp"

    36 #include "utilities/utf8.hpp"

    37 

    38 #ifdef HAVE_DTRACE_H

    39 

    40 jlong DTraceJSDT::activate(

    41     jint version, jstring module_name, jint providers_count,

    42     JVM_DTraceProvider* providers, TRAPS) {

    43 

    44   size_t count = 0;

    45   RegisteredProbes* probes = NULL;

    46 

    47   if (!is_supported()) {

    48     return 0;

    49   }

    50 

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

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

    53 

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

    55     count += providers[i].probe_count;

    56   }

    57   probes = new RegisteredProbes(count);

    58   count = 0;

    59 

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

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

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

    63            "valid probe count");

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

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

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

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

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

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

    70       methodHandle h_method =

    71         methodHandle(THREAD, Method::resolve_jmethod_id(probe->method));

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

    73       if (nm == NULL) {

    74         delete probes;

    75         THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),

    76           "Unable to register DTrace probes (CodeCache: no room for DTrace nmethods).");

    77       }

    78       h_method()->set_not_compilable();

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

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

    81     }

    82   }

    83 

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

    85     module_name, providers_count, providers);

    86   if (handle < 0) {

    87     delete probes;

    88     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),

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

    90   }

    91   probes->set_helper_handle(handle);

    92   return RegisteredProbes::toOpaqueProbes(probes);

    93 }

    94 

    95 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {

    96   Method* m = Method::resolve_jmethod_id(method);

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

    98 }

    99 

   100 void DTraceJSDT::dispose(OpaqueProbes probes) {

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

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

   103     pd_dispose(p->helper_handle());

   104     delete p;

   105   }

   106 }

   107 

   108 jboolean DTraceJSDT::is_supported() {

   109   return pd_is_supported();

   110 }

   111 

   112 #else // HAVE_DTRACE_H

   113 

   114 jlong DTraceJSDT::activate(

   115     jint version, jstring module_name, jint providers_count,

   116     JVM_DTraceProvider* providers, TRAPS) {

   117   return 0;

   118 }

   119 

   120 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {

   121   return false;

   122 }

   123 

   124 void DTraceJSDT::dispose(OpaqueProbes probes) {

   125   return;

   126 }

   127 

   128 jboolean DTraceJSDT::is_supported() {

   129   return false;

   130 }

   131 

   132 #endif // ndef HAVE_DTRACE_H