Mercurial > hg > truffle
annotate src/share/vm/ci/ciObject.cpp @ 3657:47edfca346ab
Fix a safepoint bug in code installer.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Thu, 17 Nov 2011 16:40:14 +0100 |
| parents | be4ca325525a |
| children | 46f211fe010c |
| 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 (UseGraal) { |
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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 _handle = JNIHandles::make_local(h()); |
| 0 | 77 } else { |
| 78 _handle = JNIHandles::make_global(h); | |
| 79 } | |
| 80 _klass = NULL; | |
| 81 _ident = 0; | |
| 989 | 82 init_flags_from(h()); |
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83 _temp_global = false; |
| 0 | 84 } |
| 85 | |
| 86 // ------------------------------------------------------------------ | |
| 87 // ciObject::ciObject | |
| 88 // | |
| 89 // Unloaded klass/method variant. `klass' is the klass of the unloaded | |
| 90 // klass/method, if that makes sense. | |
| 91 ciObject::ciObject(ciKlass* klass) { | |
| 92 ASSERT_IN_VM; | |
| 93 assert(klass != NULL, "must supply klass"); | |
| 94 _handle = NULL; | |
| 95 _klass = klass; | |
| 96 _ident = 0; | |
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97 _temp_global = false; |
| 0 | 98 } |
| 99 | |
| 100 // ------------------------------------------------------------------ | |
| 101 // ciObject::ciObject | |
| 102 // | |
| 103 // NULL variant. Used only by ciNullObject. | |
| 104 ciObject::ciObject() { | |
| 105 ASSERT_IN_VM; | |
| 106 _handle = NULL; | |
| 107 _klass = NULL; | |
| 108 _ident = 0; | |
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109 _temp_global = false; |
| 0 | 110 } |
| 111 | |
| 112 // ------------------------------------------------------------------ | |
| 113 // ciObject::klass | |
| 114 // | |
| 115 // Get the ciKlass of this ciObject. | |
| 116 ciKlass* ciObject::klass() { | |
| 117 if (_klass == NULL) { | |
| 118 if (_handle == NULL) { | |
| 119 // When both _klass and _handle are NULL, we are dealing | |
| 120 // with the distinguished instance of ciNullObject. | |
| 121 // No one should ask it for its klass. | |
| 122 assert(is_null_object(), "must be null object"); | |
| 123 ShouldNotReachHere(); | |
| 124 return NULL; | |
| 125 } | |
| 126 | |
| 127 GUARDED_VM_ENTRY( | |
| 128 oop o = get_oop(); | |
| 129 _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); | |
| 130 ); | |
| 131 } | |
| 132 return _klass; | |
| 133 } | |
| 134 | |
| 135 // ------------------------------------------------------------------ | |
| 136 // ciObject::set_ident | |
| 137 // | |
| 138 // Set the unique identity number of a ciObject. | |
| 139 void ciObject::set_ident(uint id) { | |
| 140 assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); | |
| 141 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); | |
| 142 _ident = _ident + (id << FLAG_BITS); | |
| 143 } | |
| 144 | |
| 145 // ------------------------------------------------------------------ | |
| 146 // ciObject::ident | |
| 147 // | |
| 148 // Report the unique identity number of a ciObject. | |
| 149 uint ciObject::ident() { | |
| 150 uint id = _ident >> FLAG_BITS; | |
| 151 assert(id != 0, "must be initialized"); | |
| 152 return id; | |
| 153 } | |
| 154 | |
| 155 // ------------------------------------------------------------------ | |
| 156 // ciObject::equals | |
| 157 // | |
| 158 // Are two ciObjects equal? | |
| 159 bool ciObject::equals(ciObject* obj) { | |
| 160 return (this == obj); | |
| 161 } | |
| 162 | |
| 163 // ------------------------------------------------------------------ | |
| 164 // ciObject::hash | |
| 165 // | |
| 166 // A hash value for the convenience of compilers. | |
| 167 // | |
| 168 // Implementation note: we use the address of the ciObject as the | |
| 169 // basis for the hash. Use the _ident field, which is well-behaved. | |
| 170 int ciObject::hash() { | |
| 171 return ident() * 31; | |
| 172 } | |
| 173 | |
| 174 // ------------------------------------------------------------------ | |
| 989 | 175 // ciObject::constant_encoding |
| 0 | 176 // |
| 177 // The address which the compiler should embed into the | |
| 178 // generated code to represent this oop. This address | |
| 179 // is not the true address of the oop -- it will get patched | |
| 180 // during nmethod creation. | |
| 181 // | |
| 182 // | |
| 183 // | |
| 184 // Implementation note: we use the handle as the encoding. The | |
| 185 // nmethod constructor resolves the handle and patches in the oop. | |
| 186 // | |
| 187 // This method should be changed to return an generified address | |
| 188 // to discourage use of the JNI handle. | |
| 989 | 189 jobject ciObject::constant_encoding() { |
| 0 | 190 assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); |
| 989 | 191 assert(can_be_constant(), "oop must be NULL or perm"); |
| 0 | 192 return handle(); |
| 193 } | |
| 194 | |
| 195 // ------------------------------------------------------------------ | |
| 989 | 196 // ciObject::can_be_constant |
| 197 bool ciObject::can_be_constant() { | |
| 198 if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant | |
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199 return handle() == NULL || is_perm(); |
| 989 | 200 } |
| 201 | |
| 202 // ------------------------------------------------------------------ | |
| 203 // ciObject::should_be_constant() | |
| 204 bool ciObject::should_be_constant() { | |
| 205 if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant | |
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206 if (!JavaObjectsInPerm && !is_null_object()) { |
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207 // We want Strings and Classes to be embeddable by default since |
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208 // they used to be in the perm world. Not all Strings used to be |
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209 // embeddable but there's no easy way to distinguish the interned |
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210 // from the regulars ones so just treat them all that way. |
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211 ciEnv* env = CURRENT_ENV; |
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212 if (klass() == env->String_klass() || klass() == env->Class_klass()) { |
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213 return true; |
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214 } |
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215 } |
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216 return handle() == NULL || is_perm(); |
| 0 | 217 } |
| 218 | |
| 219 | |
| 220 // ------------------------------------------------------------------ | |
| 221 // ciObject::print | |
| 222 // | |
| 223 // Print debugging output about this ciObject. | |
| 224 // | |
| 225 // Implementation note: dispatch to the virtual print_impl behavior | |
| 226 // for this ciObject. | |
| 227 void ciObject::print(outputStream* st) { | |
| 228 st->print("<%s", type_string()); | |
| 229 GUARDED_VM_ENTRY(print_impl(st);) | |
| 989 | 230 st->print(" ident=%d %s%s address=0x%x>", ident(), |
| 0 | 231 is_perm() ? "PERM" : "", |
| 989 | 232 is_scavengable() ? "SCAVENGABLE" : "", |
| 0 | 233 (address)this); |
| 234 } | |
| 235 | |
| 236 // ------------------------------------------------------------------ | |
| 237 // ciObject::print_oop | |
| 238 // | |
| 239 // Print debugging output about the oop this ciObject represents. | |
| 240 void ciObject::print_oop(outputStream* st) { | |
| 241 if (is_null_object()) { | |
| 242 st->print_cr("NULL"); | |
| 243 } else if (!is_loaded()) { | |
| 244 st->print_cr("UNLOADED"); | |
| 245 } else { | |
| 246 GUARDED_VM_ENTRY(get_oop()->print_on(st);) | |
| 247 } | |
| 248 } |