1 /* 2 * Copyright (c) 2015, 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 "runtime/arguments.hpp" 27 #include "runtime/commandLineFlagConstraintsRuntime.hpp" 28 #include "runtime/globals.hpp" 29 #include "runtime/java.hpp" 30 #include "runtime/os.hpp" 31 #include "utilities/defaultStream.hpp" 32 33 Flag::Error ObjectAlignmentInBytesConstraintFunc(bool verbose, intx* value) { 34 if (!is_power_of_2(*value)) { 35 if (verbose == true) { 36 jio_fprintf(defaultStream::error_stream(), 37 "ObjectAlignmentInBytes=%d must be power of 2\n", 38 (int)*value); 39 } 40 return Flag::VIOLATES_CONSTRAINT; 41 } 42 // In case page size is very small. 43 if (*value >= (int)os::vm_page_size()) { 44 if (verbose == true) { 45 jio_fprintf(defaultStream::error_stream(), 46 "ObjectAlignmentInBytes=%d must be less than page size "INTX_FORMAT"\n", 47 *value, os::vm_page_size()); 48 } 49 return Flag::VIOLATES_CONSTRAINT; 50 } 51 return Flag::SUCCESS; 52 } 53 54 // Need to enforce the padding not to break the existing field alignments. 55 // It is sufficient to check against the largest type size. 56 Flag::Error ContendedPaddingWidthConstraintFunc(bool verbose, intx* value) { 57 if ((*value != 0) && ((*value % BytesPerLong) != 0)) { 58 if (verbose == true) { 59 jio_fprintf(defaultStream::error_stream(), 60 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 61 *value, BytesPerLong); 62 } 63 return Flag::VIOLATES_CONSTRAINT; 64 } else { 65 return Flag::SUCCESS; 66 } 67 }