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annotate src/share/vm/ci/ciObject.hpp @ 14517:3812c088b945
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, 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_CI_CIOBJECT_HPP |
26 #define SHARE_VM_CI_CIOBJECT_HPP | |
27 | |
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28 #include "ci/ciBaseObject.hpp" |
1972 | 29 #include "ci/ciClassList.hpp" |
30 #include "memory/allocation.hpp" | |
31 #include "runtime/handles.hpp" | |
32 #include "runtime/jniHandles.hpp" | |
33 | |
0 | 34 // ciObject |
35 // | |
36 // This class represents an oop in the HotSpot virtual machine. | |
37 // Its subclasses are structured in a hierarchy which mirrors | |
38 // an aggregate of the VM's oop and klass hierarchies (see | |
39 // oopHierarchy.hpp). Each instance of ciObject holds a handle | |
40 // to a corresponding oop on the VM side and provides routines | |
41 // for accessing the information in its oop. By using the ciObject | |
42 // hierarchy for accessing oops in the VM, the compiler ensures | |
43 // that it is safe with respect to garbage collection; that is, | |
44 // GC and compilation can proceed independently without | |
45 // interference. | |
46 // | |
47 // Within the VM, the oop and klass hierarchies are separate. | |
48 // The compiler interface does not preserve this separation -- | |
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49 // the distinction between `Klass*' and `Klass' are not |
0 | 50 // reflected in the interface and instead the Klass hierarchy |
51 // is directly modeled as the subclasses of ciKlass. | |
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52 class ciObject : public ciBaseObject { |
0 | 53 CI_PACKAGE_ACCESS |
54 friend class ciEnv; | |
55 | |
56 private: | |
57 // A JNI handle referring to an oop in the VM. This | |
58 // handle may, in a small set of cases, correctly be NULL. | |
59 jobject _handle; | |
60 ciKlass* _klass; | |
61 | |
62 protected: | |
63 ciObject(); | |
64 ciObject(oop o); | |
65 ciObject(Handle h); | |
66 ciObject(ciKlass* klass); | |
67 | |
68 jobject handle() const { return _handle; } | |
69 // Get the VM oop that this object holds. | |
70 oop get_oop() const { | |
71 assert(_handle != NULL, "null oop"); | |
72 return JNIHandles::resolve_non_null(_handle); | |
73 } | |
74 | |
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75 void init_flags_from(oop x); |
0 | 76 |
77 // Virtual behavior of the print() method. | |
78 virtual void print_impl(outputStream* st) {} | |
79 | |
80 virtual const char* type_string() { return "ciObject"; } | |
81 | |
82 public: | |
83 // The klass of this ciObject. | |
84 ciKlass* klass(); | |
85 | |
86 // Are two ciObjects equal? | |
87 bool equals(ciObject* obj); | |
88 | |
89 // A hash value for the convenience of compilers. | |
90 int hash(); | |
91 | |
989 | 92 // Tells if this oop has an encoding as a constant. |
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93 // True if is_perm is true. |
989 | 94 // Also true if ScavengeRootsInCode is non-zero. |
0 | 95 // If it does not have an encoding, the compiler is responsible for |
96 // making other arrangements for dealing with the oop. | |
989 | 97 // See ciEnv::make_array |
98 bool can_be_constant(); | |
99 | |
100 // Tells if this oop should be made a constant. | |
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101 // True if is_perm is true or ScavengeRootsInCode > 1. |
989 | 102 bool should_be_constant(); |
0 | 103 |
989 | 104 // Might this object possibly move during a scavenge operation? |
105 // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code. | |
106 bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; } | |
107 | |
0 | 108 // The address which the compiler should embed into the |
109 // generated code to represent this oop. This address | |
110 // is not the true address of the oop -- it will get patched | |
111 // during nmethod creation. | |
112 // | |
113 // Usage note: no address arithmetic allowed. Oop must | |
114 // be registered with the oopRecorder. | |
989 | 115 jobject constant_encoding(); |
0 | 116 |
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117 virtual bool is_object() const { return true; } |
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118 |
0 | 119 // What kind of ciObject is this? |
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120 virtual bool is_null_object() const { return false; } |
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121 virtual bool is_call_site() const { return false; } |
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122 virtual bool is_cpcache() const { return false; } |
0 | 123 virtual bool is_instance() { return false; } |
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124 virtual bool is_member_name() const { return false; } |
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125 virtual bool is_method_handle() const { return false; } |
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126 virtual bool is_method_type() const { return false; } |
0 | 127 virtual bool is_array() { return false; } |
128 virtual bool is_obj_array() { return false; } | |
129 virtual bool is_type_array() { return false; } | |
130 | |
131 // Is this a type or value which has no associated class? | |
132 // It is true of primitive types and null objects. | |
133 virtual bool is_classless() const { return false; } | |
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134 virtual void dump_replay_data(outputStream* st) { /* do nothing */ } |
0 | 135 |
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136 // Note: some ciObjects refer to oops which have yet to be created. |
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137 // We refer to these as "unloaded". Specifically, there are |
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138 // unloaded instances of java.lang.Class, |
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139 // java.lang.invoke.MethodHandle, and java.lang.invoke.MethodType. |
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140 // By convention the ciNullObject is considered loaded, and |
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141 // primitive types are considered loaded. |
0 | 142 bool is_loaded() const { |
143 return handle() != NULL || is_classless(); | |
144 } | |
145 | |
146 // Subclass casting with assertions. | |
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147 ciNullObject* as_null_object() { |
0 | 148 assert(is_null_object(), "bad cast"); |
149 return (ciNullObject*)this; | |
150 } | |
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151 ciCallSite* as_call_site() { |
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152 assert(is_call_site(), "bad cast"); |
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153 return (ciCallSite*)this; |
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154 } |
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155 ciInstance* as_instance() { |
0 | 156 assert(is_instance(), "bad cast"); |
157 return (ciInstance*)this; | |
158 } | |
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159 ciMemberName* as_member_name() { |
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160 assert(is_member_name(), "bad cast"); |
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161 return (ciMemberName*)this; |
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162 } |
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163 ciMethodHandle* as_method_handle() { |
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164 assert(is_method_handle(), "bad cast"); |
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165 return (ciMethodHandle*)this; |
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166 } |
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167 ciMethodType* as_method_type() { |
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168 assert(is_method_type(), "bad cast"); |
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169 return (ciMethodType*)this; |
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170 } |
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171 ciArray* as_array() { |
0 | 172 assert(is_array(), "bad cast"); |
173 return (ciArray*)this; | |
174 } | |
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175 ciObjArray* as_obj_array() { |
0 | 176 assert(is_obj_array(), "bad cast"); |
177 return (ciObjArray*)this; | |
178 } | |
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179 ciTypeArray* as_type_array() { |
0 | 180 assert(is_type_array(), "bad cast"); |
181 return (ciTypeArray*)this; | |
182 } | |
183 | |
184 // Print debugging output about this ciObject. | |
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185 void print(outputStream* st); |
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186 void print() { print(tty); } // GDB cannot handle default arguments |
0 | 187 |
188 // Print debugging output about the oop this ciObject represents. | |
189 void print_oop(outputStream* st = tty); | |
190 }; | |
1972 | 191 |
192 #endif // SHARE_VM_CI_CIOBJECT_HPP |