1 /* 2 * Copyright (c) 2023, 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 27 #include "runtime/globals_extension.hpp" 28 #include "runtime/interfaceSupport.inline.hpp" 29 #include "runtime/runtimeUpcallNop.hpp" 30 #include "runtime/runtimeUpcalls.hpp" 31 32 bool RuntimeUpcallNop::_method_filter_result = false; 33 34 bool runtimeUpcallNop_register_upcalls() 35 { 36 return RuntimeUpcallNop::register_upcalls(); 37 } 38 39 bool RuntimeUpcallNop::register_upcalls() 40 { 41 if(AddRuntimeUpcallsNOP == nullptr || FLAG_IS_DEFAULT(AddRuntimeUpcallsNOP)) return true; 42 43 const char* method_entry = "onMethodEntry:"; 44 const size_t method_entry_len = strlen(method_entry); 45 const char* method_exit = "onMethodExit:"; 46 const size_t method_exit_len = strlen(method_exit); 47 48 const char* filter_all = "all"; 49 const size_t filter_all_len = strlen(filter_all); 50 const char* filter_none = "none"; 51 const size_t filter_none_len = strlen(filter_none); 52 53 const char* filter_option = nullptr; 54 RuntimeUpcallType upcall_type = RuntimeUpcallType::onMethodEntry; 55 const char* command = AddRuntimeUpcallsNOP == nullptr ? "" : AddRuntimeUpcallsNOP; 56 57 if (strncmp(command, method_entry, method_entry_len) == 0) { 58 filter_option = command + method_entry_len; 59 upcall_type = RuntimeUpcallType::onMethodEntry; 60 } else if (strncmp(command, method_exit, method_exit_len) == 0) { 61 filter_option = command + method_exit_len; 62 upcall_type = RuntimeUpcallType::onMethodExit; 63 } else { 64 ttyLocker ttyl; 65 tty->print_cr("An error occurred during parsing AddRuntimeUpcallsNOP"); 66 tty->print_cr("Error! Expected 'onMethodEntry:' or 'onMethodExit:'"); 67 return false; 68 } 69 70 assert(filter_option != nullptr, "sanity"); 71 if (strncmp(filter_option, filter_all, filter_all_len) == 0) { 72 _method_filter_result = true; 73 } else if (strncmp(filter_option, filter_none, filter_none_len) == 0) { 74 _method_filter_result = false; 75 } else { 76 ttyLocker ttyl; 77 tty->print_cr("An error occurred during parsing AddRuntimeUpcallsNOP"); 78 tty->print_cr("Error! Expected 'all' or 'none'"); 79 return false; 80 } 81 82 if (RuntimeUpcalls::register_upcall( 83 upcall_type, 84 "nop_method", 85 RuntimeUpcallNop::nop_method, 86 RuntimeUpcallNop::filter_method_callback)) { 87 return true; 88 } 89 return false; 90 } 91 92 bool RuntimeUpcallNop::filter_method_callback(MethodDetails& method_details) 93 { 94 return _method_filter_result; 95 } 96 97 JRT_ENTRY(void, RuntimeUpcallNop::nop_method(JavaThread* current)) 98 { 99 } 100 JRT_END