1 /* 2 * Copyright (c) 2015, 2025, 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 "runtime/flags/jvmFlag.hpp" 26 #include "runtime/flags/jvmFlagLimit.hpp" 27 #include "runtime/flags/jvmFlagConstraintsRuntime.hpp" 28 #include "runtime/globals.hpp" 29 #include "runtime/os.hpp" 30 #include "runtime/safepointMechanism.hpp" 31 #include "runtime/task.hpp" 32 #include "utilities/powerOfTwo.hpp" 33 34 JVMFlag::Error AOTCacheConstraintFunc(ccstr value, bool verbose) { 35 if (value == nullptr) { 36 JVMFlag::printError(verbose, "AOTCache cannot be empty\n"); 37 return JVMFlag::VIOLATES_CONSTRAINT; 38 } 39 return JVMFlag::SUCCESS; 40 } 41 42 JVMFlag::Error AOTConfigurationConstraintFunc(ccstr value, bool verbose) { 43 if (value == nullptr) { 44 JVMFlag::printError(verbose, "AOTConfiguration cannot be empty\n"); 45 return JVMFlag::VIOLATES_CONSTRAINT; 46 } 47 return JVMFlag::SUCCESS; 48 } 49 50 JVMFlag::Error AOTModeConstraintFunc(ccstr value, bool verbose) { 51 if (value == nullptr) { 52 JVMFlag::printError(verbose, "AOTMode cannot be empty\n"); 53 return JVMFlag::VIOLATES_CONSTRAINT; 54 } 55 if (strcmp(value, "off") != 0 && 56 strcmp(value, "record") != 0 && 57 strcmp(value, "create") != 0 && 58 strcmp(value, "auto") != 0 && 59 strcmp(value, "on") != 0) { 60 JVMFlag::printError(verbose, 61 "Unrecognized value %s for AOTMode. Must be one of the following: " 62 "off, record, create, auto, on\n", 63 value); 64 return JVMFlag::VIOLATES_CONSTRAINT; 65 } 66 return JVMFlag::SUCCESS; 67 } 68 69 JVMFlag::Error ObjectAlignmentInBytesConstraintFunc(int value, bool verbose) { 70 if (!is_power_of_2(value)) { 71 JVMFlag::printError(verbose, 72 "ObjectAlignmentInBytes (%d) must be " 73 "power of 2\n", 74 value); 75 return JVMFlag::VIOLATES_CONSTRAINT; 76 } 77 // In case page size is very small. 78 if (value >= (intx)os::vm_page_size()) { 79 JVMFlag::printError(verbose, 80 "ObjectAlignmentInBytes (%d) must be " 81 "less than page size (%zu)\n", 82 value, os::vm_page_size()); 83 return JVMFlag::VIOLATES_CONSTRAINT; 84 } 85 return JVMFlag::SUCCESS; 86 } 87 88 // Need to enforce the padding not to break the existing field alignments. 89 // It is sufficient to check against the largest type size. 90 JVMFlag::Error ContendedPaddingWidthConstraintFunc(int value, bool verbose) { 91 if ((value % BytesPerLong) != 0) { 92 JVMFlag::printError(verbose, 93 "ContendedPaddingWidth (%d) must be " 94 "a multiple of %d\n", 95 value, BytesPerLong); 96 return JVMFlag::VIOLATES_CONSTRAINT; 97 } else { 98 return JVMFlag::SUCCESS; 99 } 100 } 101 102 JVMFlag::Error PerfDataSamplingIntervalFunc(int value, bool verbose) { 103 if ((value % PeriodicTask::interval_gran != 0)) { 104 JVMFlag::printError(verbose, 105 "PerfDataSamplingInterval (%d) must be " 106 "evenly divisible by PeriodicTask::interval_gran (%d)\n", 107 value, PeriodicTask::interval_gran); 108 return JVMFlag::VIOLATES_CONSTRAINT; 109 } else { 110 return JVMFlag::SUCCESS; 111 } 112 } 113 114 JVMFlag::Error VMPageSizeConstraintFunc(uintx value, bool verbose) { 115 uintx min = (uintx)os::vm_page_size(); 116 if (value < min) { 117 JVMFlag::printError(verbose, 118 "%s %s=%zu is outside the allowed range [ %zu" 119 " ... %zu ]\n", 120 JVMFlagLimit::last_checked_flag()->type_string(), 121 JVMFlagLimit::last_checked_flag()->name(), 122 value, min, max_uintx); 123 return JVMFlag::VIOLATES_CONSTRAINT; 124 } 125 126 return JVMFlag::SUCCESS; 127 } 128 129 JVMFlag::Error NUMAInterleaveGranularityConstraintFunc(size_t value, bool verbose) { 130 size_t min = os::vm_allocation_granularity(); 131 size_t max = NOT_LP64(2*G) LP64_ONLY(8192*G); 132 133 if (value < min || value > max) { 134 JVMFlag::printError(verbose, 135 "size_t NUMAInterleaveGranularity=%zu is outside the allowed range [ %zu" 136 " ... %zu ]\n", value, min, max); 137 return JVMFlag::VIOLATES_CONSTRAINT; 138 } 139 140 return JVMFlag::SUCCESS; 141 } 142 143 JVMFlag::Error OnSpinWaitInstNameConstraintFunc(ccstr value, bool verbose) { 144 #ifdef AARCH64 145 if (value == nullptr) { 146 JVMFlag::printError(verbose, "OnSpinWaitInst cannot be empty\n"); 147 return JVMFlag::VIOLATES_CONSTRAINT; 148 } 149 150 if (strcmp(value, "nop") != 0 && 151 strcmp(value, "isb") != 0 && 152 strcmp(value, "yield") != 0 && 153 strcmp(value, "sb") != 0 && 154 strcmp(value, "none") != 0) { 155 JVMFlag::printError(verbose, 156 "Unrecognized value %s for OnSpinWaitInst. Must be one of the following: " 157 "nop, isb, yield, sb, none\n", 158 value); 159 return JVMFlag::VIOLATES_CONSTRAINT; 160 } 161 #endif 162 return JVMFlag::SUCCESS; 163 }