Mercurial > hg > graal-compiler
annotate src/share/vm/ci/ciObject.hpp @ 7046:b6a8f2d23057
VM support for deferred reads and writes: ScopeDesc, DebugInfo, DebugInfoRecorder
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 27 Nov 2012 13:43:04 +0100 |
parents | 2cb439954abf |
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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 | |
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68 public: |
0 | 69 jobject handle() const { return _handle; } |
70 // Get the VM oop that this object holds. | |
71 oop get_oop() const { | |
72 assert(_handle != NULL, "null oop"); | |
73 return JNIHandles::resolve_non_null(_handle); | |
74 } | |
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75 protected: |
0 | 76 |
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77 void init_flags_from(oop x); |
0 | 78 |
79 // Virtual behavior of the print() method. | |
80 virtual void print_impl(outputStream* st) {} | |
81 | |
82 virtual const char* type_string() { return "ciObject"; } | |
83 | |
84 public: | |
85 // The klass of this ciObject. | |
86 ciKlass* klass(); | |
87 | |
88 // Are two ciObjects equal? | |
89 bool equals(ciObject* obj); | |
90 | |
91 // A hash value for the convenience of compilers. | |
92 int hash(); | |
93 | |
989 | 94 // Tells if this oop has an encoding as a constant. |
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95 // True if is_perm is true. |
989 | 96 // Also true if ScavengeRootsInCode is non-zero. |
0 | 97 // If it does not have an encoding, the compiler is responsible for |
98 // making other arrangements for dealing with the oop. | |
989 | 99 // See ciEnv::make_array |
100 bool can_be_constant(); | |
101 | |
102 // Tells if this oop should be made a constant. | |
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103 // True if is_perm is true or ScavengeRootsInCode > 1. |
989 | 104 bool should_be_constant(); |
0 | 105 |
989 | 106 // Might this object possibly move during a scavenge operation? |
107 // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code. | |
108 bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; } | |
109 | |
0 | 110 // The address which the compiler should embed into the |
111 // generated code to represent this oop. This address | |
112 // is not the true address of the oop -- it will get patched | |
113 // during nmethod creation. | |
114 // | |
115 // Usage note: no address arithmetic allowed. Oop must | |
116 // be registered with the oopRecorder. | |
989 | 117 jobject constant_encoding(); |
0 | 118 |
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119 virtual bool is_object() const { return true; } |
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120 |
0 | 121 // What kind of ciObject is this? |
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122 virtual bool is_null_object() const { return false; } |
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123 virtual bool is_call_site() const { return false; } |
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124 virtual bool is_cpcache() const { return false; } |
0 | 125 virtual bool is_instance() { return false; } |
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126 virtual bool is_member_name() const { return false; } |
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127 virtual bool is_method_handle() const { return false; } |
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128 virtual bool is_method_type() const { return false; } |
0 | 129 virtual bool is_array() { return false; } |
130 virtual bool is_obj_array() { return false; } | |
131 virtual bool is_type_array() { return false; } | |
132 | |
133 // Is this a type or value which has no associated class? | |
134 // It is true of primitive types and null objects. | |
135 virtual bool is_classless() const { return false; } | |
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136 virtual void dump_replay_data(outputStream* st) { /* do nothing */ } |
0 | 137 |
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138 // Note: some ciObjects refer to oops which have yet to be created. |
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139 // We refer to these as "unloaded". Specifically, there are |
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140 // unloaded instances of java.lang.Class, |
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141 // java.lang.invoke.MethodHandle, and java.lang.invoke.MethodType. |
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142 // By convention the ciNullObject is considered loaded, and |
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143 // primitive types are considered loaded. |
0 | 144 bool is_loaded() const { |
145 return handle() != NULL || is_classless(); | |
146 } | |
147 | |
148 // Subclass casting with assertions. | |
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149 ciNullObject* as_null_object() { |
0 | 150 assert(is_null_object(), "bad cast"); |
151 return (ciNullObject*)this; | |
152 } | |
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153 ciCallSite* as_call_site() { |
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154 assert(is_call_site(), "bad cast"); |
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155 return (ciCallSite*)this; |
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156 } |
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157 ciInstance* as_instance() { |
0 | 158 assert(is_instance(), "bad cast"); |
159 return (ciInstance*)this; | |
160 } | |
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161 ciMemberName* as_member_name() { |
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162 assert(is_member_name(), "bad cast"); |
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163 return (ciMemberName*)this; |
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164 } |
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165 ciMethodHandle* as_method_handle() { |
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166 assert(is_method_handle(), "bad cast"); |
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167 return (ciMethodHandle*)this; |
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168 } |
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169 ciMethodType* as_method_type() { |
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170 assert(is_method_type(), "bad cast"); |
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171 return (ciMethodType*)this; |
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172 } |
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173 ciArray* as_array() { |
0 | 174 assert(is_array(), "bad cast"); |
175 return (ciArray*)this; | |
176 } | |
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177 ciObjArray* as_obj_array() { |
0 | 178 assert(is_obj_array(), "bad cast"); |
179 return (ciObjArray*)this; | |
180 } | |
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181 ciTypeArray* as_type_array() { |
0 | 182 assert(is_type_array(), "bad cast"); |
183 return (ciTypeArray*)this; | |
184 } | |
185 | |
186 // Print debugging output about this ciObject. | |
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187 void print(outputStream* st); |
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188 void print() { print(tty); } // GDB cannot handle default arguments |
0 | 189 |
190 // Print debugging output about the oop this ciObject represents. | |
191 void print_oop(outputStream* st = tty); | |
192 }; | |
1972 | 193 |
194 #endif // SHARE_VM_CI_CIOBJECT_HPP |