1 /*
   2  * Copyright 1997-2008 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