1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciObject.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,215 @@
1.4 +/*
1.5 + * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "incls/_precompiled.incl"
1.29 +#include "incls/_ciObject.cpp.incl"
1.30 +
1.31 +// ciObject
1.32 +//
1.33 +// This class represents an oop in the HotSpot virtual machine.
1.34 +// Its subclasses are structured in a hierarchy which mirrors
1.35 +// an aggregate of the VM's oop and klass hierarchies (see
1.36 +// oopHierarchy.hpp). Each instance of ciObject holds a handle
1.37 +// to a corresponding oop on the VM side and provides routines
1.38 +// for accessing the information in its oop. By using the ciObject
1.39 +// hierarchy for accessing oops in the VM, the compiler ensures
1.40 +// that it is safe with respect to garbage collection; that is,
1.41 +// GC and compilation can proceed independently without
1.42 +// interference.
1.43 +//
1.44 +// Within the VM, the oop and klass hierarchies are separate.
1.45 +// The compiler interface does not preserve this separation --
1.46 +// the distinction between `klassOop' and `Klass' are not
1.47 +// reflected in the interface and instead the Klass hierarchy
1.48 +// is directly modeled as the subclasses of ciKlass.
1.49 +
1.50 +// ------------------------------------------------------------------
1.51 +// ciObject::ciObject
1.52 +ciObject::ciObject(oop o) {
1.53 + ASSERT_IN_VM;
1.54 + if (ciObjectFactory::is_initialized()) {
1.55 + _handle = JNIHandles::make_local(o);
1.56 + } else {
1.57 + _handle = JNIHandles::make_global(o);
1.58 + }
1.59 + _klass = NULL;
1.60 + _ident = 0;
1.61 +}
1.62 +
1.63 +// ------------------------------------------------------------------
1.64 +// ciObject::ciObject
1.65 +//
1.66 +ciObject::ciObject(Handle h) {
1.67 + ASSERT_IN_VM;
1.68 + if (ciObjectFactory::is_initialized()) {
1.69 + _handle = JNIHandles::make_local(h());
1.70 + } else {
1.71 + _handle = JNIHandles::make_global(h);
1.72 + }
1.73 + _klass = NULL;
1.74 + _ident = 0;
1.75 +}
1.76 +
1.77 +// ------------------------------------------------------------------
1.78 +// ciObject::ciObject
1.79 +//
1.80 +// Unloaded klass/method variant. `klass' is the klass of the unloaded
1.81 +// klass/method, if that makes sense.
1.82 +ciObject::ciObject(ciKlass* klass) {
1.83 + ASSERT_IN_VM;
1.84 + assert(klass != NULL, "must supply klass");
1.85 + _handle = NULL;
1.86 + _klass = klass;
1.87 + _ident = 0;
1.88 +}
1.89 +
1.90 +// ------------------------------------------------------------------
1.91 +// ciObject::ciObject
1.92 +//
1.93 +// NULL variant. Used only by ciNullObject.
1.94 +ciObject::ciObject() {
1.95 + ASSERT_IN_VM;
1.96 + _handle = NULL;
1.97 + _klass = NULL;
1.98 + _ident = 0;
1.99 +}
1.100 +
1.101 +// ------------------------------------------------------------------
1.102 +// ciObject::klass
1.103 +//
1.104 +// Get the ciKlass of this ciObject.
1.105 +ciKlass* ciObject::klass() {
1.106 + if (_klass == NULL) {
1.107 + if (_handle == NULL) {
1.108 + // When both _klass and _handle are NULL, we are dealing
1.109 + // with the distinguished instance of ciNullObject.
1.110 + // No one should ask it for its klass.
1.111 + assert(is_null_object(), "must be null object");
1.112 + ShouldNotReachHere();
1.113 + return NULL;
1.114 + }
1.115 +
1.116 + GUARDED_VM_ENTRY(
1.117 + oop o = get_oop();
1.118 + _klass = CURRENT_ENV->get_object(o->klass())->as_klass();
1.119 + );
1.120 + }
1.121 + return _klass;
1.122 +}
1.123 +
1.124 +// ------------------------------------------------------------------
1.125 +// ciObject::set_ident
1.126 +//
1.127 +// Set the unique identity number of a ciObject.
1.128 +void ciObject::set_ident(uint id) {
1.129 + assert((_ident >> FLAG_BITS) == 0, "must only initialize once");
1.130 + assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big");
1.131 + _ident = _ident + (id << FLAG_BITS);
1.132 +}
1.133 +
1.134 +// ------------------------------------------------------------------
1.135 +// ciObject::ident
1.136 +//
1.137 +// Report the unique identity number of a ciObject.
1.138 +uint ciObject::ident() {
1.139 + uint id = _ident >> FLAG_BITS;
1.140 + assert(id != 0, "must be initialized");
1.141 + return id;
1.142 +}
1.143 +
1.144 +// ------------------------------------------------------------------
1.145 +// ciObject::equals
1.146 +//
1.147 +// Are two ciObjects equal?
1.148 +bool ciObject::equals(ciObject* obj) {
1.149 + return (this == obj);
1.150 +}
1.151 +
1.152 +// ------------------------------------------------------------------
1.153 +// ciObject::hash
1.154 +//
1.155 +// A hash value for the convenience of compilers.
1.156 +//
1.157 +// Implementation note: we use the address of the ciObject as the
1.158 +// basis for the hash. Use the _ident field, which is well-behaved.
1.159 +int ciObject::hash() {
1.160 + return ident() * 31;
1.161 +}
1.162 +
1.163 +// ------------------------------------------------------------------
1.164 +// ciObject::encoding
1.165 +//
1.166 +// The address which the compiler should embed into the
1.167 +// generated code to represent this oop. This address
1.168 +// is not the true address of the oop -- it will get patched
1.169 +// during nmethod creation.
1.170 +//
1.171 +//
1.172 +//
1.173 +// Implementation note: we use the handle as the encoding. The
1.174 +// nmethod constructor resolves the handle and patches in the oop.
1.175 +//
1.176 +// This method should be changed to return an generified address
1.177 +// to discourage use of the JNI handle.
1.178 +jobject ciObject::encoding() {
1.179 + assert(is_null_object() || handle() != NULL, "cannot embed null pointer");
1.180 + assert(has_encoding(), "oop must be NULL or perm");
1.181 + return handle();
1.182 +}
1.183 +
1.184 +// ------------------------------------------------------------------
1.185 +// ciObject::has_encoding
1.186 +bool ciObject::has_encoding() {
1.187 + return handle() == NULL || is_perm();
1.188 +}
1.189 +
1.190 +
1.191 +// ------------------------------------------------------------------
1.192 +// ciObject::print
1.193 +//
1.194 +// Print debugging output about this ciObject.
1.195 +//
1.196 +// Implementation note: dispatch to the virtual print_impl behavior
1.197 +// for this ciObject.
1.198 +void ciObject::print(outputStream* st) {
1.199 + st->print("<%s", type_string());
1.200 + GUARDED_VM_ENTRY(print_impl(st);)
1.201 + st->print(" ident=%d %s address=0x%x>", ident(),
1.202 + is_perm() ? "PERM" : "",
1.203 + (address)this);
1.204 +}
1.205 +
1.206 +// ------------------------------------------------------------------
1.207 +// ciObject::print_oop
1.208 +//
1.209 +// Print debugging output about the oop this ciObject represents.
1.210 +void ciObject::print_oop(outputStream* st) {
1.211 + if (is_null_object()) {
1.212 + st->print_cr("NULL");
1.213 + } else if (!is_loaded()) {
1.214 + st->print_cr("UNLOADED");
1.215 + } else {
1.216 + GUARDED_VM_ENTRY(get_oop()->print_on(st);)
1.217 + }
1.218 +}
