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annotate src/share/vm/ci/ciObject.cpp @ 2044:06f017f7daa7
Merge.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Fri, 07 Jan 2011 18:18:08 +0100 |
| parents | 2d26b0046e0d f95d63e2154a |
| children | 75a99b4f1c98 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1999, 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 #include "precompiled.hpp" |
| 26 #include "ci/ciObject.hpp" | |
| 27 #include "ci/ciUtilities.hpp" | |
| 28 #include "gc_interface/collectedHeap.inline.hpp" | |
| 29 #include "oops/oop.inline2.hpp" | |
| 0 | 30 |
| 31 // ciObject | |
| 32 // | |
| 33 // This class represents an oop in the HotSpot virtual machine. | |
| 34 // Its subclasses are structured in a hierarchy which mirrors | |
| 35 // an aggregate of the VM's oop and klass hierarchies (see | |
| 36 // oopHierarchy.hpp). Each instance of ciObject holds a handle | |
| 37 // to a corresponding oop on the VM side and provides routines | |
| 38 // for accessing the information in its oop. By using the ciObject | |
| 39 // hierarchy for accessing oops in the VM, the compiler ensures | |
| 40 // that it is safe with respect to garbage collection; that is, | |
| 41 // GC and compilation can proceed independently without | |
| 42 // interference. | |
| 43 // | |
| 44 // Within the VM, the oop and klass hierarchies are separate. | |
| 45 // The compiler interface does not preserve this separation -- | |
| 46 // the distinction between `klassOop' and `Klass' are not | |
| 47 // reflected in the interface and instead the Klass hierarchy | |
| 48 // is directly modeled as the subclasses of ciKlass. | |
| 49 | |
| 50 // ------------------------------------------------------------------ | |
| 51 // ciObject::ciObject | |
| 52 ciObject::ciObject(oop o) { | |
| 53 ASSERT_IN_VM; | |
| 54 if (ciObjectFactory::is_initialized()) { | |
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55 if (UseC1X) { |
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56 _handle = JNIHandles::make_global(o); |
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57 _temp_global = true; |
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58 } else { |
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59 _handle = JNIHandles::make_local(o); |
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60 } |
| 0 | 61 } else { |
| 62 _handle = JNIHandles::make_global(o); | |
| 63 } | |
| 64 _klass = NULL; | |
| 65 _ident = 0; | |
| 989 | 66 init_flags_from(o); |
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67 _temp_global = false; |
| 0 | 68 } |
| 69 | |
| 70 // ------------------------------------------------------------------ | |
| 71 // ciObject::ciObject | |
| 72 // | |
| 73 ciObject::ciObject(Handle h) { | |
| 74 ASSERT_IN_VM; | |
| 75 if (ciObjectFactory::is_initialized()) { | |
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76 if (UseC1X) { |
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77 _handle = JNIHandles::make_global(h); |
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78 _temp_global = true; |
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79 } else { |
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80 _handle = JNIHandles::make_local(h()); |
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81 } |
| 0 | 82 } else { |
| 83 _handle = JNIHandles::make_global(h); | |
| 84 } | |
| 85 _klass = NULL; | |
| 86 _ident = 0; | |
| 989 | 87 init_flags_from(h()); |
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88 _temp_global = false; |
| 0 | 89 } |
| 90 | |
| 91 // ------------------------------------------------------------------ | |
| 92 // ciObject::ciObject | |
| 93 // | |
| 94 // Unloaded klass/method variant. `klass' is the klass of the unloaded | |
| 95 // klass/method, if that makes sense. | |
| 96 ciObject::ciObject(ciKlass* klass) { | |
| 97 ASSERT_IN_VM; | |
| 98 assert(klass != NULL, "must supply klass"); | |
| 99 _handle = NULL; | |
| 100 _klass = klass; | |
| 101 _ident = 0; | |
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102 _temp_global = false; |
| 0 | 103 } |
| 104 | |
| 105 // ------------------------------------------------------------------ | |
| 106 // ciObject::ciObject | |
| 107 // | |
| 108 // NULL variant. Used only by ciNullObject. | |
| 109 ciObject::ciObject() { | |
| 110 ASSERT_IN_VM; | |
| 111 _handle = NULL; | |
| 112 _klass = NULL; | |
| 113 _ident = 0; | |
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114 _temp_global = false; |
| 0 | 115 } |
| 116 | |
| 117 // ------------------------------------------------------------------ | |
| 118 // ciObject::klass | |
| 119 // | |
| 120 // Get the ciKlass of this ciObject. | |
| 121 ciKlass* ciObject::klass() { | |
| 122 if (_klass == NULL) { | |
| 123 if (_handle == NULL) { | |
| 124 // When both _klass and _handle are NULL, we are dealing | |
| 125 // with the distinguished instance of ciNullObject. | |
| 126 // No one should ask it for its klass. | |
| 127 assert(is_null_object(), "must be null object"); | |
| 128 ShouldNotReachHere(); | |
| 129 return NULL; | |
| 130 } | |
| 131 | |
| 132 GUARDED_VM_ENTRY( | |
| 133 oop o = get_oop(); | |
| 134 _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); | |
| 135 ); | |
| 136 } | |
| 137 return _klass; | |
| 138 } | |
| 139 | |
| 140 // ------------------------------------------------------------------ | |
| 141 // ciObject::set_ident | |
| 142 // | |
| 143 // Set the unique identity number of a ciObject. | |
| 144 void ciObject::set_ident(uint id) { | |
| 145 assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); | |
| 146 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); | |
| 147 _ident = _ident + (id << FLAG_BITS); | |
| 148 } | |
| 149 | |
| 150 // ------------------------------------------------------------------ | |
| 151 // ciObject::ident | |
| 152 // | |
| 153 // Report the unique identity number of a ciObject. | |
| 154 uint ciObject::ident() { | |
| 155 uint id = _ident >> FLAG_BITS; | |
| 156 assert(id != 0, "must be initialized"); | |
| 157 return id; | |
| 158 } | |
| 159 | |
| 160 // ------------------------------------------------------------------ | |
| 161 // ciObject::equals | |
| 162 // | |
| 163 // Are two ciObjects equal? | |
| 164 bool ciObject::equals(ciObject* obj) { | |
| 165 return (this == obj); | |
| 166 } | |
| 167 | |
| 168 // ------------------------------------------------------------------ | |
| 169 // ciObject::hash | |
| 170 // | |
| 171 // A hash value for the convenience of compilers. | |
| 172 // | |
| 173 // Implementation note: we use the address of the ciObject as the | |
| 174 // basis for the hash. Use the _ident field, which is well-behaved. | |
| 175 int ciObject::hash() { | |
| 176 return ident() * 31; | |
| 177 } | |
| 178 | |
| 179 // ------------------------------------------------------------------ | |
| 989 | 180 // ciObject::constant_encoding |
| 0 | 181 // |
| 182 // The address which the compiler should embed into the | |
| 183 // generated code to represent this oop. This address | |
| 184 // is not the true address of the oop -- it will get patched | |
| 185 // during nmethod creation. | |
| 186 // | |
| 187 // | |
| 188 // | |
| 189 // Implementation note: we use the handle as the encoding. The | |
| 190 // nmethod constructor resolves the handle and patches in the oop. | |
| 191 // | |
| 192 // This method should be changed to return an generified address | |
| 193 // to discourage use of the JNI handle. | |
| 989 | 194 jobject ciObject::constant_encoding() { |
| 0 | 195 assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); |
| 989 | 196 assert(can_be_constant(), "oop must be NULL or perm"); |
| 0 | 197 return handle(); |
| 198 } | |
| 199 | |
| 200 // ------------------------------------------------------------------ | |
| 989 | 201 // ciObject::can_be_constant |
| 202 bool ciObject::can_be_constant() { | |
| 203 if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant | |
| 204 return handle() == NULL || !is_scavengable(); | |
| 205 } | |
| 206 | |
| 207 // ------------------------------------------------------------------ | |
| 208 // ciObject::should_be_constant() | |
| 209 bool ciObject::should_be_constant() { | |
| 210 if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant | |
| 211 return handle() == NULL || !is_scavengable(); | |
| 0 | 212 } |
| 213 | |
| 214 | |
| 215 // ------------------------------------------------------------------ | |
| 216 // ciObject::print | |
| 217 // | |
| 218 // Print debugging output about this ciObject. | |
| 219 // | |
| 220 // Implementation note: dispatch to the virtual print_impl behavior | |
| 221 // for this ciObject. | |
| 222 void ciObject::print(outputStream* st) { | |
| 223 st->print("<%s", type_string()); | |
| 224 GUARDED_VM_ENTRY(print_impl(st);) | |
| 989 | 225 st->print(" ident=%d %s%s address=0x%x>", ident(), |
| 0 | 226 is_perm() ? "PERM" : "", |
| 989 | 227 is_scavengable() ? "SCAVENGABLE" : "", |
| 0 | 228 (address)this); |
| 229 } | |
| 230 | |
| 231 // ------------------------------------------------------------------ | |
| 232 // ciObject::print_oop | |
| 233 // | |
| 234 // Print debugging output about the oop this ciObject represents. | |
| 235 void ciObject::print_oop(outputStream* st) { | |
| 236 if (is_null_object()) { | |
| 237 st->print_cr("NULL"); | |
| 238 } else if (!is_loaded()) { | |
| 239 st->print_cr("UNLOADED"); | |
| 240 } else { | |
| 241 GUARDED_VM_ENTRY(get_oop()->print_on(st);) | |
| 242 } | |
| 243 } |