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annotate src/share/vm/oops/oopsHierarchy.hpp @ 12257:01b268b3080a
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Reviewed-by: twisti, kvn, sla
author | vlivanov |
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date | Fri, 13 Sep 2013 04:16:54 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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_OOPS_OOPSHIERARCHY_HPP |
26 #define SHARE_VM_OOPS_OOPSHIERARCHY_HPP | |
27 | |
28 #include "runtime/globals.hpp" | |
29 #include "utilities/globalDefinitions.hpp" | |
30 | |
0 | 31 // OBJECT hierarchy |
32 // This hierarchy is a representation hierarchy, i.e. if A is a superclass | |
33 // of B, A's representation is a prefix of B's representation. | |
34 | |
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35 typedef juint narrowOop; // Offset instead of address for an oop within a java object |
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36 |
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37 // If compressed klass pointers then use narrowKlass. |
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38 typedef juint narrowKlass; |
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39 |
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40 typedef void* OopOrNarrowOopStar; |
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41 typedef class markOopDesc* markOop; |
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42 |
0 | 43 #ifndef CHECK_UNHANDLED_OOPS |
44 | |
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45 typedef class oopDesc* oop; |
0 | 46 typedef class instanceOopDesc* instanceOop; |
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47 typedef class arrayOopDesc* arrayOop; |
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48 typedef class objArrayOopDesc* objArrayOop; |
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49 typedef class typeArrayOopDesc* typeArrayOop; |
0 | 50 |
51 #else | |
52 | |
53 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a | |
54 // carefully chosen set of constructors and conversion operators to go | |
55 // to and from the underlying oopDesc pointer type. | |
56 // | |
57 // Because oop and its subclasses <type>Oop are class types, arbitrary | |
58 // conversions are not accepted by the compiler, and you may get a message | |
59 // about overloading ambiguity (between long and int is common when converting | |
60 // from a constant in 64 bit mode), or unable to convert from type to 'oop'. | |
61 // Applying a cast to one of these conversion operators first will get to the | |
62 // underlying oopDesc* type if appropriate. | |
63 // Converting NULL to oop to Handle implicit is no longer accepted by the | |
64 // compiler because there are too many steps in the conversion. Use Handle() | |
65 // instead, which generates less code anyway. | |
66 | |
67 class Thread; | |
68 class PromotedObject; | |
69 | |
70 | |
71 class oop { | |
72 oopDesc* _o; | |
73 | |
74 void register_oop(); | |
75 void unregister_oop(); | |
76 | |
77 // friend class markOop; | |
78 public: | |
79 void set_obj(const void* p) { | |
80 raw_set_obj(p); | |
81 if (CheckUnhandledOops) register_oop(); | |
82 } | |
83 void raw_set_obj(const void* p) { _o = (oopDesc*)p; } | |
84 | |
85 oop() { set_obj(NULL); } | |
86 oop(const volatile oop& o) { set_obj(o.obj()); } | |
87 oop(const void* p) { set_obj(p); } | |
88 oop(intptr_t i) { set_obj((void *)i); } | |
89 #ifdef _LP64 | |
90 oop(int i) { set_obj((void *)i); } | |
91 #endif | |
92 ~oop() { | |
93 if (CheckUnhandledOops) unregister_oop(); | |
94 } | |
95 | |
96 oopDesc* obj() const volatile { return _o; } | |
97 | |
98 // General access | |
99 oopDesc* operator->() const { return obj(); } | |
100 bool operator==(const oop o) const { return obj() == o.obj(); } | |
101 bool operator==(void *p) const { return obj() == p; } | |
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102 bool operator!=(const volatile oop o) const { return obj() != o.obj(); } |
0 | 103 bool operator!=(void *p) const { return obj() != p; } |
104 bool operator==(intptr_t p) const { return obj() == (oopDesc*)p; } | |
105 bool operator!=(intptr_t p) const { return obj() != (oopDesc*)p; } | |
106 | |
107 bool operator<(oop o) const { return obj() < o.obj(); } | |
108 bool operator>(oop o) const { return obj() > o.obj(); } | |
109 bool operator<=(oop o) const { return obj() <= o.obj(); } | |
110 bool operator>=(oop o) const { return obj() >= o.obj(); } | |
111 bool operator!() const { return !obj(); } | |
112 | |
113 // Cast | |
114 operator void* () const { return (void *)obj(); } | |
115 operator HeapWord* () const { return (HeapWord*)obj(); } | |
116 operator oopDesc* () const { return obj(); } | |
117 operator intptr_t* () const { return (intptr_t*)obj(); } | |
118 operator PromotedObject* () const { return (PromotedObject*)obj(); } | |
119 operator markOop () const { return markOop(obj()); } | |
120 | |
121 operator address () const { return (address)obj(); } | |
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122 operator intptr_t () const volatile { return (intptr_t)obj(); } |
0 | 123 |
124 // from javaCalls.cpp | |
125 operator jobject () const { return (jobject)obj(); } | |
126 // from javaClasses.cpp | |
127 operator JavaThread* () const { return (JavaThread*)obj(); } | |
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128 |
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129 #ifndef _LP64 |
0 | 130 // from jvm.cpp |
131 operator jlong* () const { return (jlong*)obj(); } | |
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132 #endif |
0 | 133 |
134 // from parNewGeneration and other things that want to get to the end of | |
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135 // an oop for stuff (like ObjArrayKlass.cpp) |
0 | 136 operator oop* () const { return (oop *)obj(); } |
137 }; | |
138 | |
139 #define DEF_OOP(type) \ | |
140 class type##OopDesc; \ | |
141 class type##Oop : public oop { \ | |
142 public: \ | |
143 type##Oop() : oop() {} \ | |
144 type##Oop(const volatile oop& o) : oop(o) {} \ | |
145 type##Oop(const void* p) : oop(p) {} \ | |
146 operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \ | |
147 type##OopDesc* operator->() const { \ | |
148 return (type##OopDesc*)obj(); \ | |
149 } \ | |
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150 }; |
0 | 151 |
152 DEF_OOP(instance); | |
153 DEF_OOP(array); | |
154 DEF_OOP(objArray); | |
155 DEF_OOP(typeArray); | |
156 | |
157 #endif // CHECK_UNHANDLED_OOPS | |
158 | |
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159 // The metadata hierarchy is separate from the oop hierarchy |
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160 |
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161 // class MetaspaceObj |
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162 class ConstMethod; |
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163 class ConstantPoolCache; |
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164 class MethodData; |
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165 // class Metadata |
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166 class Method; |
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167 class ConstantPool; |
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168 // class CHeapObj |
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169 class CompiledICHolder; |
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170 |
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171 |
0 | 172 // The klass hierarchy is separate from the oop hierarchy. |
173 | |
174 class Klass; | |
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175 class InstanceKlass; |
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176 class InstanceMirrorKlass; |
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177 class InstanceClassLoaderKlass; |
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178 class InstanceRefKlass; |
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179 class ArrayKlass; |
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180 class ObjArrayKlass; |
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181 class TypeArrayKlass; |
1972 | 182 |
183 #endif // SHARE_VM_OOPS_OOPSHIERARCHY_HPP |