--- /dev/null 2015-06-13 09:00:42.000000000 -0500 +++ new/src/share/vm/runtime/commandLineFlagConstraintsRuntime.cpp 2015-06-13 09:00:42.000000000 -0500 @@ -0,0 +1,65 @@ +/* + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "runtime/arguments.hpp" +#include "runtime/commandLineFlagConstraintsRuntime.hpp" +#include "runtime/globals.hpp" +#include "utilities/defaultStream.hpp" + +Flag::Error ObjectAlignmentInBytesConstraintFunc(bool verbose, intx* value) { + if (!is_power_of_2(*value)) { + if (verbose == true) { + jio_fprintf(defaultStream::error_stream(), + "ObjectAlignmentInBytes=" INTX_FORMAT " must be power of 2\n", + *value); + } + return Flag::VIOLATES_CONSTRAINT; + } + // In case page size is very small. + if (*value >= (intx)os::vm_page_size()) { + if (verbose == true) { + jio_fprintf(defaultStream::error_stream(), + "ObjectAlignmentInBytes=" INTX_FORMAT " must be less than page size " INTX_FORMAT "\n", + *value, (intx)os::vm_page_size()); + } + return Flag::VIOLATES_CONSTRAINT; + } + return Flag::SUCCESS; +} + +// Need to enforce the padding not to break the existing field alignments. +// It is sufficient to check against the largest type size. +Flag::Error ContendedPaddingWidthConstraintFunc(bool verbose, intx* value) { + if ((*value != 0) && ((*value % BytesPerLong) != 0)) { + if (verbose == true) { + jio_fprintf(defaultStream::error_stream(), + "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", + *value, BytesPerLong); + } + return Flag::VIOLATES_CONSTRAINT; + } else { + return Flag::SUCCESS; + } +}