Tue, 11 Nov 2014 11:05:41 +0100
8056071: compiler/whitebox/IsMethodCompilableTest.java fails with 'method() is not compilable after 3 iterations'
Summary: Always use MDO if valid and always compile trivial methods with C1 if available.
Reviewed-by: kvn, iveresov
1 /*
2 * Copyright (c) 2006, 2012, 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_OOPS_MARKOOP_INLINE_HPP
26 #define SHARE_VM_OOPS_MARKOOP_INLINE_HPP
28 #include "oops/klass.hpp"
29 #include "oops/markOop.hpp"
30 #include "runtime/globals.hpp"
32 // Should this header be preserved during GC (when biased locking is enabled)?
33 inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const {
34 assert(UseBiasedLocking, "unexpected");
35 if (has_bias_pattern()) {
36 // Will reset bias at end of collection
37 // Mark words of biased and currently locked objects are preserved separately
38 return false;
39 }
40 markOop prototype_header = prototype_for_object(obj_containing_mark);
41 if (prototype_header->has_bias_pattern()) {
42 // Individual instance which has its bias revoked; must return
43 // true for correctness
44 return true;
45 }
46 return (!is_unlocked() || !has_no_hash());
47 }
49 // Should this header be preserved during GC?
50 inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const {
51 if (!UseBiasedLocking)
52 return (!is_unlocked() || !has_no_hash());
53 return must_be_preserved_with_bias(obj_containing_mark);
54 }
56 // Should this header be preserved in the case of a promotion failure
57 // during scavenge (when biased locking is enabled)?
58 inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const {
59 assert(UseBiasedLocking, "unexpected");
60 // We don't explicitly save off the mark words of biased and
61 // currently-locked objects during scavenges, so if during a
62 // promotion failure we encounter either a biased mark word or a
63 // klass which still has a biasable prototype header, we have to
64 // preserve the mark word. This results in oversaving, but promotion
65 // failures are rare, and this avoids adding more complex logic to
66 // the scavengers to call new variants of
67 // BiasedLocking::preserve_marks() / restore_marks() in the middle
68 // of a scavenge when a promotion failure has first been detected.
69 if (has_bias_pattern() ||
70 prototype_for_object(obj_containing_mark)->has_bias_pattern()) {
71 return true;
72 }
73 return (!is_unlocked() || !has_no_hash());
74 }
76 // Should this header be preserved in the case of a promotion failure
77 // during scavenge?
78 inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const {
79 if (!UseBiasedLocking)
80 return (!is_unlocked() || !has_no_hash());
81 return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark);
82 }
85 // Same as must_be_preserved_with_bias_for_promotion_failure() except that
86 // it takes a Klass* argument, instead of the object of which this is the mark word.
87 inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const {
88 assert(UseBiasedLocking, "unexpected");
89 // CMS scavenges preserve mark words in similar fashion to promotion failures; see above
90 if (has_bias_pattern() ||
91 klass_of_obj_containing_mark->prototype_header()->has_bias_pattern()) {
92 return true;
93 }
94 return (!is_unlocked() || !has_no_hash());
95 }
97 // Same as must_be_preserved_for_promotion_failure() except that
98 // it takes a Klass* argument, instead of the object of which this is the mark word.
99 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const {
100 if (!UseBiasedLocking)
101 return (!is_unlocked() || !has_no_hash());
102 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
103 }
105 inline markOop markOopDesc::prototype_for_object(oop obj) {
106 #ifdef ASSERT
107 markOop prototype_header = obj->klass()->prototype_header();
108 assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header");
109 #endif
110 return obj->klass()->prototype_header();
111 }
113 #endif // SHARE_VM_OOPS_MARKOOP_INLINE_HPP