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 "runtime/sharedRuntime.hpp" 35 #include "utilities/exceptions.hpp" 36 #include "utilities/globalDefinitions.hpp" 37 #include "utilities/utf8.hpp" 38 39 #ifdef HAVE_DTRACE_H 40 41 jlong DTraceJSDT::activate( 42 jint version, jstring module_name, jint providers_count, 43 JVM_DTraceProvider* providers, TRAPS) { 44 45 size_t count = 0; 46 RegisteredProbes* probes = NULL; 47 48 if (!is_supported()) { 49 return 0; 50 } 51 52 assert(module_name != NULL, "valid module name"); 53 assert(providers != NULL, "valid provider array"); 54 55 for (int i = 0; i < providers_count; ++i) { 56 count += providers[i].probe_count; 57 } 58 probes = new RegisteredProbes(count); 59 count = 0; 60 61 for (int i = 0; i < providers_count; ++i) { 62 assert(providers[i].name != NULL, "valid provider name"); 63 assert(providers[i].probe_count == 0 || providers[i].probes != NULL, 64 "valid probe count"); 65 for (int j = 0; j < providers[i].probe_count; ++j) { 66 JVM_DTraceProbe* probe = &(providers[i].probes[j]); 67 assert(probe != NULL, "valid probe"); 68 assert(probe->method != NULL, "valid method"); 69 assert(probe->name != NULL, "valid probe name"); 70 assert(probe->function != NULL, "valid probe function spec"); 71 methodHandle h_method = 72 methodHandle(THREAD, Method::resolve_jmethod_id(probe->method)); 73 nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method); 74 if (nm == NULL) { 75 delete probes; 76 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), 77 "Unable to register DTrace probes (CodeCache: no room for DTrace nmethods)."); 78 } 79 h_method()->set_not_compilable(); 80 h_method()->set_code(h_method, nm); 81 probes->nmethod_at_put(count++, nm); 82 } 83 } 84 85 int handle = pd_activate((void*)probes, 86 module_name, providers_count, providers); 87 if (handle < 0) { 88 delete probes; 89 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), 90 "Unable to register DTrace probes (internal error)."); 91 } 92 probes->set_helper_handle(handle); 93 return RegisteredProbes::toOpaqueProbes(probes); 94 } 95 96 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) { 97 Method* m = Method::resolve_jmethod_id(method); 98 return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap(); 99 } 100 101 void DTraceJSDT::dispose(OpaqueProbes probes) { 102 RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes); 103 if (probes != -1 && p != NULL) { 104 pd_dispose(p->helper_handle()); 105 delete p; 106 } 107 } 108 109 jboolean DTraceJSDT::is_supported() { 110 return pd_is_supported(); 111 } 112 113 #else // HAVE_DTRACE_H 114 115 jlong DTraceJSDT::activate( 116 jint version, jstring module_name, jint providers_count, 117 JVM_DTraceProvider* providers, TRAPS) { 118 return 0; 119 } 120 121 jboolean DTraceJSDT::is_probe_enabled(jmethodID method) { 122 return false; 123 } 124 125 void DTraceJSDT::dispose(OpaqueProbes probes) { 126 return; 127 } 128 129 jboolean DTraceJSDT::is_supported() { 130 return false; 131 } 132 133 #endif // ndef HAVE_DTRACE_H