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comparison src/share/vm/ci/ciObject.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 1d7922586cf6
children f6b0eb4e44cf
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6724:36d1d483d5d6 6725:da91efe96a93
1 /* 1 /*
2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
23 */ 23 */
24 24
25 #ifndef SHARE_VM_CI_CIOBJECT_HPP 25 #ifndef SHARE_VM_CI_CIOBJECT_HPP
26 #define SHARE_VM_CI_CIOBJECT_HPP 26 #define SHARE_VM_CI_CIOBJECT_HPP
27 27
28 #include "ci/ciBaseObject.hpp"
28 #include "ci/ciClassList.hpp" 29 #include "ci/ciClassList.hpp"
29 #include "memory/allocation.hpp" 30 #include "memory/allocation.hpp"
30 #include "runtime/handles.hpp" 31 #include "runtime/handles.hpp"
31 #include "runtime/jniHandles.hpp" 32 #include "runtime/jniHandles.hpp"
32 33
43 // GC and compilation can proceed independently without 44 // GC and compilation can proceed independently without
44 // interference. 45 // interference.
45 // 46 //
46 // Within the VM, the oop and klass hierarchies are separate. 47 // Within the VM, the oop and klass hierarchies are separate.
47 // The compiler interface does not preserve this separation -- 48 // The compiler interface does not preserve this separation --
48 // the distinction between `klassOop' and `Klass' are not 49 // the distinction between `Klass*' and `Klass' are not
49 // reflected in the interface and instead the Klass hierarchy 50 // reflected in the interface and instead the Klass hierarchy
50 // is directly modeled as the subclasses of ciKlass. 51 // is directly modeled as the subclasses of ciKlass.
51 class ciObject : public ResourceObj { 52 class ciObject : public ciBaseObject {
52 CI_PACKAGE_ACCESS 53 CI_PACKAGE_ACCESS
53 friend class ciEnv; 54 friend class ciEnv;
54 55
55 private: 56 private:
56 // A JNI handle referring to an oop in the VM. This 57 // A JNI handle referring to an oop in the VM. This
57 // handle may, in a small set of cases, correctly be NULL. 58 // handle may, in a small set of cases, correctly be NULL.
58 jobject _handle; 59 jobject _handle;
59 ciKlass* _klass; 60 ciKlass* _klass;
60 uint _ident;
61 61
62 enum { FLAG_BITS = 2 };
63 enum {
64 PERM_FLAG = 1,
65 SCAVENGABLE_FLAG = 2
66 };
67 protected: 62 protected:
68 ciObject(); 63 ciObject();
69 ciObject(oop o); 64 ciObject(oop o);
70 ciObject(Handle h); 65 ciObject(Handle h);
71 ciObject(ciKlass* klass); 66 ciObject(ciKlass* klass);
75 oop get_oop() const { 70 oop get_oop() const {
76 assert(_handle != NULL, "null oop"); 71 assert(_handle != NULL, "null oop");
77 return JNIHandles::resolve_non_null(_handle); 72 return JNIHandles::resolve_non_null(_handle);
78 } 73 }
79 74
80 void init_flags_from(oop x) { 75 void init_flags_from(oop x);
81 int flags = 0;
82 if (x != NULL) {
83 if (x->is_perm())
84 flags |= PERM_FLAG;
85 if (x->is_scavengable())
86 flags |= SCAVENGABLE_FLAG;
87 }
88 _ident |= flags;
89 }
90 76
91 // Virtual behavior of the print() method. 77 // Virtual behavior of the print() method.
92 virtual void print_impl(outputStream* st) {} 78 virtual void print_impl(outputStream* st) {}
93 79
94 virtual const char* type_string() { return "ciObject"; } 80 virtual const char* type_string() { return "ciObject"; }
95 81
96 void set_ident(uint id);
97 public: 82 public:
98 // The klass of this ciObject. 83 // The klass of this ciObject.
99 ciKlass* klass(); 84 ciKlass* klass();
100
101 // A number unique to this object.
102 uint ident();
103 85
104 // Are two ciObjects equal? 86 // Are two ciObjects equal?
105 bool equals(ciObject* obj); 87 bool equals(ciObject* obj);
106 88
107 // A hash value for the convenience of compilers. 89 // A hash value for the convenience of compilers.
117 99
118 // Tells if this oop should be made a constant. 100 // Tells if this oop should be made a constant.
119 // True if is_perm is true or ScavengeRootsInCode > 1. 101 // True if is_perm is true or ScavengeRootsInCode > 1.
120 bool should_be_constant(); 102 bool should_be_constant();
121 103
122 // Is this object guaranteed to be in the permanent part of the heap?
123 // If so, CollectedHeap::can_elide_permanent_oop_store_barriers is relevant.
124 // If the answer is false, no guarantees are made.
125 bool is_perm() { return (_ident & PERM_FLAG) != 0; }
126
127 // Might this object possibly move during a scavenge operation? 104 // Might this object possibly move during a scavenge operation?
128 // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code. 105 // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code.
129 bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; } 106 bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; }
130 107
131 // The address which the compiler should embed into the 108 // The address which the compiler should embed into the
135 // 112 //
136 // Usage note: no address arithmetic allowed. Oop must 113 // Usage note: no address arithmetic allowed. Oop must
137 // be registered with the oopRecorder. 114 // be registered with the oopRecorder.
138 jobject constant_encoding(); 115 jobject constant_encoding();
139 116
117 virtual bool is_object() const { return true; }
118
140 // What kind of ciObject is this? 119 // What kind of ciObject is this?
141 virtual bool is_null_object() const { return false; } 120 virtual bool is_null_object() const { return false; }
142 virtual bool is_call_site() const { return false; } 121 virtual bool is_call_site() const { return false; }
143 virtual bool is_cpcache() const { return false; } 122 virtual bool is_cpcache() const { return false; }
144 virtual bool is_instance() { return false; } 123 virtual bool is_instance() { return false; }
145 virtual bool is_member_name() const { return false; } 124 virtual bool is_member_name() const { return false; }
146 virtual bool is_method() { return false; }
147 virtual bool is_method_data() { return false; }
148 virtual bool is_method_handle() const { return false; } 125 virtual bool is_method_handle() const { return false; }
149 virtual bool is_array() { return false; } 126 virtual bool is_array() { return false; }
150 virtual bool is_obj_array() { return false; } 127 virtual bool is_obj_array() { return false; }
151 virtual bool is_type_array() { return false; } 128 virtual bool is_type_array() { return false; }
152 virtual bool is_symbol() { return false; }
153 virtual bool is_type() { return false; }
154 virtual bool is_return_address() { return false; }
155 virtual bool is_klass() { return false; }
156 virtual bool is_instance_klass() { return false; }
157 virtual bool is_method_klass() { return false; }
158 virtual bool is_array_klass() { return false; }
159 virtual bool is_obj_array_klass() { return false; }
160 virtual bool is_type_array_klass() { return false; }
161 virtual bool is_symbol_klass() { return false; }
162 virtual bool is_klass_klass() { return false; }
163 virtual bool is_instance_klass_klass() { return false; }
164 virtual bool is_array_klass_klass() { return false; }
165 virtual bool is_obj_array_klass_klass() { return false; }
166 virtual bool is_type_array_klass_klass() { return false; }
167 129
168 // Is this a type or value which has no associated class? 130 // Is this a type or value which has no associated class?
169 // It is true of primitive types and null objects. 131 // It is true of primitive types and null objects.
170 virtual bool is_classless() const { return false; } 132 virtual bool is_classless() const { return false; }
171 133
172 // Is this ciObject a Java Language Object? That is, 134 // Note: some ciObjects refer to oops which have yet to be created.
173 // is the ciObject an instance or an array 135 // We refer to these as "unloaded". Specifically, there are
174 virtual bool is_java_object() { return false; } 136 // unloaded instances of java.lang.Class,
175 137 // java.lang.invoke.MethodHandle, and java.lang.invoke.MethodType.
176 // Does this ciObject represent a Java Language class? 138 // By convention the ciNullObject is considered loaded, and
177 // That is, is the ciObject an instanceKlass or arrayKlass? 139 // primitive types are considered loaded.
178 virtual bool is_java_klass() { return false; }
179
180 // Is this ciObject the ciInstanceKlass representing
181 // java.lang.Object()?
182 virtual bool is_java_lang_Object() { return false; }
183
184 // Does this ciObject refer to a real oop in the VM?
185 //
186 // Note: some ciObjects refer to oops which have yet to be
187 // created. We refer to these as "unloaded". Specifically,
188 // there are unloaded ciMethods, ciObjArrayKlasses, and
189 // ciInstanceKlasses. By convention the ciNullObject is
190 // considered loaded, and primitive types are considered loaded.
191 bool is_loaded() const { 140 bool is_loaded() const {
192 return handle() != NULL || is_classless(); 141 return handle() != NULL || is_classless();
193 } 142 }
194 143
195 // Subclass casting with assertions. 144 // Subclass casting with assertions.
199 } 148 }
200 ciCallSite* as_call_site() { 149 ciCallSite* as_call_site() {
201 assert(is_call_site(), "bad cast"); 150 assert(is_call_site(), "bad cast");
202 return (ciCallSite*) this; 151 return (ciCallSite*) this;
203 } 152 }
204 ciCPCache* as_cpcache() {
205 assert(is_cpcache(), "bad cast");
206 return (ciCPCache*) this;
207 }
208 ciInstance* as_instance() { 153 ciInstance* as_instance() {
209 assert(is_instance(), "bad cast"); 154 assert(is_instance(), "bad cast");
210 return (ciInstance*)this; 155 return (ciInstance*)this;
211 } 156 }
212 ciMemberName* as_member_name() { 157 ciMemberName* as_member_name() {
213 assert(is_member_name(), "bad cast"); 158 assert(is_member_name(), "bad cast");
214 return (ciMemberName*)this; 159 return (ciMemberName*)this;
215 }
216 ciMethod* as_method() {
217 assert(is_method(), "bad cast");
218 return (ciMethod*)this;
219 }
220 ciMethodData* as_method_data() {
221 assert(is_method_data(), "bad cast");
222 return (ciMethodData*)this;
223 } 160 }
224 ciMethodHandle* as_method_handle() { 161 ciMethodHandle* as_method_handle() {
225 assert(is_method_handle(), "bad cast"); 162 assert(is_method_handle(), "bad cast");
226 return (ciMethodHandle*) this; 163 return (ciMethodHandle*) this;
227 } 164 }
235 } 172 }
236 ciTypeArray* as_type_array() { 173 ciTypeArray* as_type_array() {
237 assert(is_type_array(), "bad cast"); 174 assert(is_type_array(), "bad cast");
238 return (ciTypeArray*)this; 175 return (ciTypeArray*)this;
239 } 176 }
240 ciSymbol* as_symbol() {
241 assert(is_symbol(), "bad cast");
242 return (ciSymbol*)this;
243 }
244 ciType* as_type() {
245 assert(is_type(), "bad cast");
246 return (ciType*)this;
247 }
248 ciReturnAddress* as_return_address() {
249 assert(is_return_address(), "bad cast");
250 return (ciReturnAddress*)this;
251 }
252 ciKlass* as_klass() {
253 assert(is_klass(), "bad cast");
254 return (ciKlass*)this;
255 }
256 ciInstanceKlass* as_instance_klass() {
257 assert(is_instance_klass(), "bad cast");
258 return (ciInstanceKlass*)this;
259 }
260 ciMethodKlass* as_method_klass() {
261 assert(is_method_klass(), "bad cast");
262 return (ciMethodKlass*)this;
263 }
264 ciArrayKlass* as_array_klass() {
265 assert(is_array_klass(), "bad cast");
266 return (ciArrayKlass*)this;
267 }
268 ciObjArrayKlass* as_obj_array_klass() {
269 assert(is_obj_array_klass(), "bad cast");
270 return (ciObjArrayKlass*)this;
271 }
272 ciTypeArrayKlass* as_type_array_klass() {
273 assert(is_type_array_klass(), "bad cast");
274 return (ciTypeArrayKlass*)this;
275 }
276 ciKlassKlass* as_klass_klass() {
277 assert(is_klass_klass(), "bad cast");
278 return (ciKlassKlass*)this;
279 }
280 ciInstanceKlassKlass* as_instance_klass_klass() {
281 assert(is_instance_klass_klass(), "bad cast");
282 return (ciInstanceKlassKlass*)this;
283 }
284 ciArrayKlassKlass* as_array_klass_klass() {
285 assert(is_array_klass_klass(), "bad cast");
286 return (ciArrayKlassKlass*)this;
287 }
288 ciObjArrayKlassKlass* as_obj_array_klass_klass() {
289 assert(is_obj_array_klass_klass(), "bad cast");
290 return (ciObjArrayKlassKlass*)this;
291 }
292 ciTypeArrayKlassKlass* as_type_array_klass_klass() {
293 assert(is_type_array_klass_klass(), "bad cast");
294 return (ciTypeArrayKlassKlass*)this;
295 }
296 177
297 // Print debugging output about this ciObject. 178 // Print debugging output about this ciObject.
298 void print(outputStream* st); 179 void print(outputStream* st);
299 void print() { print(tty); } // GDB cannot handle default arguments 180 void print() { print(tty); } // GDB cannot handle default arguments
300 181