Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/stackValue.hpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
author | ysr |
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date | Wed, 16 Mar 2011 10:37:08 -0700 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_STACKVALUE_HPP |
26 #define SHARE_VM_RUNTIME_STACKVALUE_HPP | |
27 | |
28 #include "code/location.hpp" | |
29 #include "runtime/handles.hpp" | |
30 #include "utilities/top.hpp" | |
31 | |
0 | 32 class StackValue : public ResourceObj { |
33 private: | |
34 BasicType _type; | |
35 intptr_t _i; // Blank java stack slot value | |
36 Handle _o; // Java stack slot value interpreted as a Handle | |
37 public: | |
38 | |
39 StackValue(intptr_t value) { | |
40 _type = T_INT; | |
41 _i = value; | |
42 } | |
43 | |
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44 StackValue(Handle value, intptr_t scalar_replaced = 0) { |
0 | 45 _type = T_OBJECT; |
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46 _i = scalar_replaced; |
0 | 47 _o = value; |
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48 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); |
0 | 49 } |
50 | |
51 StackValue() { | |
52 _type = T_CONFLICT; | |
53 _i = 0; | |
54 } | |
55 | |
56 // Only used during deopt- preserve object type. | |
57 StackValue(intptr_t o, BasicType t) { | |
58 assert(t == T_OBJECT, "should not be used"); | |
59 _type = t; | |
60 _i = o; | |
61 } | |
62 | |
63 Handle get_obj() const { | |
64 assert(type() == T_OBJECT, "type check"); | |
65 return _o; | |
66 } | |
67 | |
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68 bool obj_is_scalar_replaced() const { |
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69 assert(type() == T_OBJECT, "type check"); |
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70 return _i != 0; |
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71 } |
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72 |
0 | 73 void set_obj(Handle value) { |
74 assert(type() == T_OBJECT, "type check"); | |
75 _o = value; | |
76 } | |
77 | |
78 intptr_t get_int() const { | |
79 assert(type() == T_INT, "type check"); | |
80 return _i; | |
81 } | |
82 | |
83 // For special case in deopt. | |
84 intptr_t get_int(BasicType t) const { | |
85 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); | |
86 return _i; | |
87 } | |
88 | |
89 void set_int(intptr_t value) { | |
90 assert(type() == T_INT, "type check"); | |
91 _i = value; | |
92 } | |
93 | |
94 BasicType type() const { return _type; } | |
95 | |
96 bool equal(StackValue *value) { | |
97 if (_type != value->_type) return false; | |
98 if (_type == T_OBJECT) | |
99 return (_o == value->_o); | |
100 else { | |
101 assert(_type == T_INT, "sanity check"); | |
102 // [phh] compare only low addressed portions of intptr_t slots | |
103 return (*(int *)&_i == *(int *)&value->_i); | |
104 } | |
105 } | |
106 | |
107 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); | |
108 static BasicLock* resolve_monitor_lock(const frame* fr, Location location); | |
109 | |
110 #ifndef PRODUCT | |
111 public: | |
112 // Printing | |
113 void print_on(outputStream* st) const; | |
114 #endif | |
115 }; | |
1972 | 116 |
117 #endif // SHARE_VM_RUNTIME_STACKVALUE_HPP |