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