1 /* 2 * Copyright (c) 1997, 2010, 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 "memory/allocation.hpp" 29 #include "prims/jvm.h" 30 #include "runtime/dtraceJSDT.hpp" 31 #include "runtime/jniHandles.hpp" 32 #include "runtime/os.hpp" 33 #include "utilities/exceptions.hpp" 34 #include "utilities/globalDefinitions.hpp" 35 #include "utilities/utf8.hpp" 36 37 #ifdef HAVE_DTRACE_H 38 39 jlong DTraceJSDT::activate( 40 jint version, jstring module_name, jint providers_count, 41 JVM_DTraceProvider* providers, TRAPS) { 42 43 size_t count = 0; 44 RegisteredProbes* probes = NULL; 45 46 if (!is_supported()) { 47 return 0; 48 } 49 50 assert(module_name != NULL, "valid module name"); 51 assert(providers != NULL, "valid provider array"); 52 53 for (int i = 0; i < providers_count; ++i) { 54 count += providers[i].probe_count; 55 } 56 probes = new RegisteredProbes(count); 57 count = 0; 58 59 for (int i = 0; i < providers_count; ++i) { 60 assert(providers[i].name != NULL, "valid provider name"); 61 assert(providers[i].probe_count == 0 || providers[i].probes != NULL, 62 "valid probe count"); 63 for (int j = 0; j < providers[i].probe_count; ++j) { 64 JVM_DTraceProbe* probe = &(providers[i].probes[j]); 65 assert(probe != NULL, "valid probe"); 66 assert(probe->method != NULL, "valid method"); 67 assert(probe->name != NULL, "valid probe name"); 68 assert(probe->function != NULL, "valid probe function spec"); 69 methodHandle h_method = 70 methodHandle(THREAD, JNIHandles::resolve_jmethod_id(probe->method)); 71 nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method); 72 if (nm == NULL) { 73 delete probes; 74 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), 75 "Unable to register DTrace probes (CodeCache: no room for DTrace nmethods)."); 76 } 77 h_method()->set_not_compilable(); 78 h_method()->set_code(h_method, nm); 79 probes->nmethod_at_put(count++, nm); 80 } 81 } 82 83 int handle = pd_activate((void*)probes, 84 module_name, providers_count, providers); 85 if (handle <= 0) { 86 delete probes; 87 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), 88 "Unable to register DTrace probes (internal error)."); 89 } 90 probes->set_helper_handle(handle); 91 return RegisteredProbes::toOpaqueProbes(probes); 92 } 93 94 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) { 95 methodOop m = JNIHandles::resolve_jmethod_id(method); 96 return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap(); 97 } 98 99 void DTraceJSDT::dispose(OpaqueProbes probes) { 100 RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes); 101 if (probes != -1 && p != NULL) { 102 pd_dispose(p->helper_handle()); 103 delete p; 104 } 105 } 106 107 jboolean DTraceJSDT::is_supported() { 108 return pd_is_supported(); 109 } 110 111 #else // HAVE_DTRACE_H 112 113 jlong DTraceJSDT::activate( 114 jint version, jstring module_name, jint providers_count, 115 JVM_DTraceProvider* providers, TRAPS) { 116 return 0; 117 } 118 119 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) { 120 return false; 121 } 122 123 void DTraceJSDT::dispose(OpaqueProbes probes) { 124 return; 125 } 126 127 jboolean DTraceJSDT::is_supported() { 128 return false; 129 } 130 131 #endif // ndef HAVE_DTRACE_H