1/*
2 * Copyright (c) 2017, 2019, 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#include "precompiled.hpp"
25#include "gc/z/zArguments.hpp"
26#include "gc/z/zCollectedHeap.hpp"
27#include "gc/z/zWorkers.hpp"
28#include "gc/shared/gcArguments.hpp"
29#include "runtime/globals.hpp"
30#include "runtime/globals_extension.hpp"
31
32void ZArguments::initialize_alignments() {
33 SpaceAlignment = ZGranuleSize;
34 HeapAlignment = SpaceAlignment;
35}
36
37void ZArguments::initialize() {
38 GCArguments::initialize();
39
40 // Check max heap size
41 if (MaxHeapSize > ZMaxHeapSize) {
42 vm_exit_during_initialization("Java heap too large");
43 }
44
45 // Enable NUMA by default
46 if (FLAG_IS_DEFAULT(UseNUMA)) {
47 FLAG_SET_DEFAULT(UseNUMA, true);
48 }
49
50 // Disable biased locking by default
51 if (FLAG_IS_DEFAULT(UseBiasedLocking)) {
52 FLAG_SET_DEFAULT(UseBiasedLocking, false);
53 }
54
55 // Select number of parallel threads
56 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
57 FLAG_SET_DEFAULT(ParallelGCThreads, ZWorkers::calculate_nparallel());
58 }
59
60 if (ParallelGCThreads == 0) {
61 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ParallelGCThreads=0");
62 }
63
64 // Select number of concurrent threads
65 if (FLAG_IS_DEFAULT(ConcGCThreads)) {
66 FLAG_SET_DEFAULT(ConcGCThreads, ZWorkers::calculate_nconcurrent());
67 }
68
69 if (ConcGCThreads == 0) {
70 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ConcGCThreads=0");
71 }
72
73#ifdef COMPILER2
74 // Enable loop strip mining by default
75 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
76 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
77 if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
78 FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
79 }
80 }
81#endif
82
83 // CompressedOops/UseCompressedClassPointers not supported
84 FLAG_SET_DEFAULT(UseCompressedOops, false);
85 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
86
87 // Verification before startup and after exit not (yet) supported
88 FLAG_SET_DEFAULT(VerifyDuringStartup, false);
89 FLAG_SET_DEFAULT(VerifyBeforeExit, false);
90
91 // Verification before heap iteration not (yet) supported, for the
92 // same reason we need fixup_partial_loads
93 FLAG_SET_DEFAULT(VerifyBeforeIteration, false);
94
95 if (VerifyBeforeGC || VerifyDuringGC || VerifyAfterGC) {
96 FLAG_SET_DEFAULT(ZVerifyRoots, true);
97 FLAG_SET_DEFAULT(ZVerifyObjects, true);
98 }
99
100 // Verification of stacks not (yet) supported, for the same reason
101 // we need fixup_partial_loads
102 DEBUG_ONLY(FLAG_SET_DEFAULT(VerifyStack, false));
103
104 // Initialize platform specific arguments
105 initialize_platform();
106}
107
108size_t ZArguments::conservative_max_heap_alignment() {
109 return 0;
110}
111
112CollectedHeap* ZArguments::create_heap() {
113 return new ZCollectedHeap();
114}
115