Mercurial > hg > graal-jvmci-8
annotate src/share/vm/ci/ciObject.cpp @ 1478:5571b97fc1ec
More JNI global handle clean ups.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Fri, 26 Nov 2010 19:45:05 +0100 |
| parents | 3483ec571caf |
| children | 2d26b0046e0d |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_ciObject.cpp.incl" | |
| 27 | |
| 28 // ciObject | |
| 29 // | |
| 30 // This class represents an oop in the HotSpot virtual machine. | |
| 31 // Its subclasses are structured in a hierarchy which mirrors | |
| 32 // an aggregate of the VM's oop and klass hierarchies (see | |
| 33 // oopHierarchy.hpp). Each instance of ciObject holds a handle | |
| 34 // to a corresponding oop on the VM side and provides routines | |
| 35 // for accessing the information in its oop. By using the ciObject | |
| 36 // hierarchy for accessing oops in the VM, the compiler ensures | |
| 37 // that it is safe with respect to garbage collection; that is, | |
| 38 // GC and compilation can proceed independently without | |
| 39 // interference. | |
| 40 // | |
| 41 // Within the VM, the oop and klass hierarchies are separate. | |
| 42 // The compiler interface does not preserve this separation -- | |
| 43 // the distinction between `klassOop' and `Klass' are not | |
| 44 // reflected in the interface and instead the Klass hierarchy | |
| 45 // is directly modeled as the subclasses of ciKlass. | |
| 46 | |
| 47 // ------------------------------------------------------------------ | |
| 48 // ciObject::ciObject | |
| 49 ciObject::ciObject(oop o) { | |
| 50 ASSERT_IN_VM; | |
|
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51 if (ciObjectFactory::is_initialized()) { |
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52 if (UseC1X) { |
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53 _handle = JNIHandles::make_global(o); |
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54 _temp_global = true; |
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55 } else { |
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56 _handle = JNIHandles::make_local(o); |
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parents:
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57 } |
| 0 | 58 } else { |
| 59 _handle = JNIHandles::make_global(o); | |
| 60 } | |
| 61 _klass = NULL; | |
| 62 _ident = 0; | |
| 989 | 63 init_flags_from(o); |
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parents:
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64 _temp_global = false; |
| 0 | 65 } |
| 66 | |
| 67 // ------------------------------------------------------------------ | |
| 68 // ciObject::ciObject | |
| 69 // | |
| 70 ciObject::ciObject(Handle h) { | |
| 71 ASSERT_IN_VM; | |
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parents:
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72 if (ciObjectFactory::is_initialized()) { |
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5571b97fc1ec
More JNI global handle clean ups.
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parents:
1422
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changeset
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73 if (UseC1X) { |
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More JNI global handle clean ups.
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parents:
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74 _handle = JNIHandles::make_global(h); |
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More JNI global handle clean ups.
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parents:
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75 _temp_global = true; |
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More JNI global handle clean ups.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
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76 } else { |
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5571b97fc1ec
More JNI global handle clean ups.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1422
diff
changeset
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77 _handle = JNIHandles::make_local(h()); |
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5571b97fc1ec
More JNI global handle clean ups.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1422
diff
changeset
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78 } |
| 0 | 79 } else { |
| 80 _handle = JNIHandles::make_global(h); | |
| 81 } | |
| 82 _klass = NULL; | |
| 83 _ident = 0; | |
| 989 | 84 init_flags_from(h()); |
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parents:
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85 _temp_global = false; |
| 0 | 86 } |
| 87 | |
| 88 // ------------------------------------------------------------------ | |
| 89 // ciObject::ciObject | |
| 90 // | |
| 91 // Unloaded klass/method variant. `klass' is the klass of the unloaded | |
| 92 // klass/method, if that makes sense. | |
| 93 ciObject::ciObject(ciKlass* klass) { | |
| 94 ASSERT_IN_VM; | |
| 95 assert(klass != NULL, "must supply klass"); | |
| 96 _handle = NULL; | |
| 97 _klass = klass; | |
| 98 _ident = 0; | |
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More JNI global handle clean ups.
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parents:
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changeset
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99 _temp_global = false; |
| 0 | 100 } |
| 101 | |
| 102 // ------------------------------------------------------------------ | |
| 103 // ciObject::ciObject | |
| 104 // | |
| 105 // NULL variant. Used only by ciNullObject. | |
| 106 ciObject::ciObject() { | |
| 107 ASSERT_IN_VM; | |
| 108 _handle = NULL; | |
| 109 _klass = NULL; | |
| 110 _ident = 0; | |
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parents:
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111 _temp_global = false; |
| 0 | 112 } |
| 113 | |
| 114 // ------------------------------------------------------------------ | |
| 115 // ciObject::klass | |
| 116 // | |
| 117 // Get the ciKlass of this ciObject. | |
| 118 ciKlass* ciObject::klass() { | |
| 119 if (_klass == NULL) { | |
| 120 if (_handle == NULL) { | |
| 121 // When both _klass and _handle are NULL, we are dealing | |
| 122 // with the distinguished instance of ciNullObject. | |
| 123 // No one should ask it for its klass. | |
| 124 assert(is_null_object(), "must be null object"); | |
| 125 ShouldNotReachHere(); | |
| 126 return NULL; | |
| 127 } | |
| 128 | |
| 129 GUARDED_VM_ENTRY( | |
| 130 oop o = get_oop(); | |
| 131 _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); | |
| 132 ); | |
| 133 } | |
| 134 return _klass; | |
| 135 } | |
| 136 | |
| 137 // ------------------------------------------------------------------ | |
| 138 // ciObject::set_ident | |
| 139 // | |
| 140 // Set the unique identity number of a ciObject. | |
| 141 void ciObject::set_ident(uint id) { | |
| 142 assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); | |
| 143 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); | |
| 144 _ident = _ident + (id << FLAG_BITS); | |
| 145 } | |
| 146 | |
| 147 // ------------------------------------------------------------------ | |
| 148 // ciObject::ident | |
| 149 // | |
| 150 // Report the unique identity number of a ciObject. | |
| 151 uint ciObject::ident() { | |
| 152 uint id = _ident >> FLAG_BITS; | |
| 153 assert(id != 0, "must be initialized"); | |
| 154 return id; | |
| 155 } | |
| 156 | |
| 157 // ------------------------------------------------------------------ | |
| 158 // ciObject::equals | |
| 159 // | |
| 160 // Are two ciObjects equal? | |
| 161 bool ciObject::equals(ciObject* obj) { | |
| 162 return (this == obj); | |
| 163 } | |
| 164 | |
| 165 // ------------------------------------------------------------------ | |
| 166 // ciObject::hash | |
| 167 // | |
| 168 // A hash value for the convenience of compilers. | |
| 169 // | |
| 170 // Implementation note: we use the address of the ciObject as the | |
| 171 // basis for the hash. Use the _ident field, which is well-behaved. | |
| 172 int ciObject::hash() { | |
| 173 return ident() * 31; | |
| 174 } | |
| 175 | |
| 176 // ------------------------------------------------------------------ | |
| 989 | 177 // ciObject::constant_encoding |
| 0 | 178 // |
| 179 // The address which the compiler should embed into the | |
| 180 // generated code to represent this oop. This address | |
| 181 // is not the true address of the oop -- it will get patched | |
| 182 // during nmethod creation. | |
| 183 // | |
| 184 // | |
| 185 // | |
| 186 // Implementation note: we use the handle as the encoding. The | |
| 187 // nmethod constructor resolves the handle and patches in the oop. | |
| 188 // | |
| 189 // This method should be changed to return an generified address | |
| 190 // to discourage use of the JNI handle. | |
| 989 | 191 jobject ciObject::constant_encoding() { |
| 0 | 192 assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); |
| 989 | 193 assert(can_be_constant(), "oop must be NULL or perm"); |
| 0 | 194 return handle(); |
| 195 } | |
| 196 | |
| 197 // ------------------------------------------------------------------ | |
| 989 | 198 // ciObject::can_be_constant |
| 199 bool ciObject::can_be_constant() { | |
| 200 if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant | |
| 201 return handle() == NULL || !is_scavengable(); | |
| 202 } | |
| 203 | |
| 204 // ------------------------------------------------------------------ | |
| 205 // ciObject::should_be_constant() | |
| 206 bool ciObject::should_be_constant() { | |
| 207 if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant | |
| 208 return handle() == NULL || !is_scavengable(); | |
| 0 | 209 } |
| 210 | |
| 211 | |
| 212 // ------------------------------------------------------------------ | |
| 213 // ciObject::print | |
| 214 // | |
| 215 // Print debugging output about this ciObject. | |
| 216 // | |
| 217 // Implementation note: dispatch to the virtual print_impl behavior | |
| 218 // for this ciObject. | |
| 219 void ciObject::print(outputStream* st) { | |
| 220 st->print("<%s", type_string()); | |
| 221 GUARDED_VM_ENTRY(print_impl(st);) | |
| 989 | 222 st->print(" ident=%d %s%s address=0x%x>", ident(), |
| 0 | 223 is_perm() ? "PERM" : "", |
| 989 | 224 is_scavengable() ? "SCAVENGABLE" : "", |
| 0 | 225 (address)this); |
| 226 } | |
| 227 | |
| 228 // ------------------------------------------------------------------ | |
| 229 // ciObject::print_oop | |
| 230 // | |
| 231 // Print debugging output about the oop this ciObject represents. | |
| 232 void ciObject::print_oop(outputStream* st) { | |
| 233 if (is_null_object()) { | |
| 234 st->print_cr("NULL"); | |
| 235 } else if (!is_loaded()) { | |
| 236 st->print_cr("UNLOADED"); | |
| 237 } else { | |
| 238 GUARDED_VM_ENTRY(get_oop()->print_on(st);) | |
| 239 } | |
| 240 } |