commandLineFlagConstraintsRuntime.cpp revision 8569:5bbf25472731 
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.
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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
31Flag::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.
54Flag::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}
66