1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciKlass.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,239 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "ci/ciKlass.hpp"
1.30 +#include "ci/ciSymbol.hpp"
1.31 +#include "ci/ciUtilities.hpp"
1.32 +#include "oops/oop.inline.hpp"
1.33 +
1.34 +// ciKlass
1.35 +//
1.36 +// This class represents a Klass* in the HotSpot virtual
1.37 +// machine.
1.38 +
1.39 +// ------------------------------------------------------------------
1.40 +// ciKlass::ciKlass
1.41 +ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
1.42 + assert(get_Klass()->is_klass(), "wrong type");
1.43 + Klass* k = get_Klass();
1.44 + _layout_helper = k->layout_helper();
1.45 + Symbol* klass_name = k->name();
1.46 + assert(klass_name != NULL, "wrong ciKlass constructor");
1.47 + _name = CURRENT_ENV->get_symbol(klass_name);
1.48 +}
1.49 +
1.50 +// ------------------------------------------------------------------
1.51 +// ciKlass::ciKlass
1.52 +//
1.53 +// Nameless klass variant.
1.54 +ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
1.55 + assert(get_Klass()->is_klass(), "wrong type");
1.56 + _name = name;
1.57 + _layout_helper = Klass::_lh_neutral_value;
1.58 +}
1.59 +
1.60 +// ------------------------------------------------------------------
1.61 +// ciKlass::ciKlass
1.62 +//
1.63 +// Unloaded klass variant.
1.64 +ciKlass::ciKlass(ciSymbol* name, BasicType bt) : ciType(bt) {
1.65 + _name = name;
1.66 + _layout_helper = Klass::_lh_neutral_value;
1.67 +}
1.68 +
1.69 +// ------------------------------------------------------------------
1.70 +// ciKlass::is_subtype_of
1.71 +bool ciKlass::is_subtype_of(ciKlass* that) {
1.72 + assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
1.73 + assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));
1.74 +
1.75 + // Check to see if the klasses are identical.
1.76 + if (this == that) {
1.77 + return true;
1.78 + }
1.79 +
1.80 + VM_ENTRY_MARK;
1.81 + Klass* this_klass = get_Klass();
1.82 + Klass* that_klass = that->get_Klass();
1.83 + bool result = this_klass->is_subtype_of(that_klass);
1.84 +
1.85 + return result;
1.86 +}
1.87 +
1.88 +// ------------------------------------------------------------------
1.89 +// ciKlass::is_subclass_of
1.90 +bool ciKlass::is_subclass_of(ciKlass* that) {
1.91 + assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
1.92 + assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));
1.93 +
1.94 + VM_ENTRY_MARK;
1.95 + Klass* this_klass = get_Klass();
1.96 + Klass* that_klass = that->get_Klass();
1.97 + bool result = this_klass->is_subclass_of(that_klass);
1.98 +
1.99 + return result;
1.100 +}
1.101 +
1.102 +// ------------------------------------------------------------------
1.103 +// ciKlass::super_depth
1.104 +juint ciKlass::super_depth() {
1.105 + assert(is_loaded(), "must be loaded");
1.106 +
1.107 + VM_ENTRY_MARK;
1.108 + Klass* this_klass = get_Klass();
1.109 + return this_klass->super_depth();
1.110 +}
1.111 +
1.112 +// ------------------------------------------------------------------
1.113 +// ciKlass::super_check_offset
1.114 +juint ciKlass::super_check_offset() {
1.115 + assert(is_loaded(), "must be loaded");
1.116 +
1.117 + VM_ENTRY_MARK;
1.118 + Klass* this_klass = get_Klass();
1.119 + return this_klass->super_check_offset();
1.120 +}
1.121 +
1.122 +// ------------------------------------------------------------------
1.123 +// ciKlass::super_of_depth
1.124 +ciKlass* ciKlass::super_of_depth(juint i) {
1.125 + assert(is_loaded(), "must be loaded");
1.126 +
1.127 + VM_ENTRY_MARK;
1.128 + Klass* this_klass = get_Klass();
1.129 + Klass* super = this_klass->primary_super_of_depth(i);
1.130 + return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL;
1.131 +}
1.132 +
1.133 +// ------------------------------------------------------------------
1.134 +// ciKlass::can_be_primary_super
1.135 +bool ciKlass::can_be_primary_super() {
1.136 + assert(is_loaded(), "must be loaded");
1.137 +
1.138 + VM_ENTRY_MARK;
1.139 + Klass* this_klass = get_Klass();
1.140 + return this_klass->can_be_primary_super();
1.141 +}
1.142 +
1.143 +// ------------------------------------------------------------------
1.144 +// ciKlass::least_common_ancestor
1.145 +//
1.146 +// Get the shared parent of two klasses.
1.147 +//
1.148 +// Implementation note: this method currently goes "over the wall"
1.149 +// and does all of the work on the VM side. It could be rewritten
1.150 +// to use the super() method and do all of the work (aside from the
1.151 +// lazy computation of super()) in native mode. This may be
1.152 +// worthwhile if the compiler is repeatedly requesting the same lca
1.153 +// computation or possibly if most of the superklasses have already
1.154 +// been created as ciObjects anyway. Something to think about...
1.155 +ciKlass*
1.156 +ciKlass::least_common_ancestor(ciKlass* that) {
1.157 + assert(is_loaded() && that->is_loaded(), "must be loaded");
1.158 + // Check to see if the klasses are identical.
1.159 + if (this == that) {
1.160 + return this;
1.161 + }
1.162 +
1.163 + VM_ENTRY_MARK;
1.164 + Klass* this_klass = get_Klass();
1.165 + Klass* that_klass = that->get_Klass();
1.166 + Klass* lca = this_klass->LCA(that_klass);
1.167 +
1.168 + // Many times the LCA will be either this_klass or that_klass.
1.169 + // Treat these as special cases.
1.170 + if (lca == that_klass) {
1.171 + return that;
1.172 + }
1.173 + if (this_klass == lca) {
1.174 + return this;
1.175 + }
1.176 +
1.177 + // Create the ciInstanceKlass for the lca.
1.178 + ciKlass* result =
1.179 + CURRENT_THREAD_ENV->get_klass(lca);
1.180 +
1.181 + return result;
1.182 +}
1.183 +
1.184 +// ------------------------------------------------------------------
1.185 +// ciKlass::find_klass
1.186 +//
1.187 +// Find a klass using this klass's class loader.
1.188 +ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
1.189 + assert(is_loaded(), "cannot find_klass through an unloaded klass");
1.190 + return CURRENT_ENV->get_klass_by_name(this,
1.191 + klass_name, false);
1.192 +}
1.193 +
1.194 +// ------------------------------------------------------------------
1.195 +// ciKlass::java_mirror
1.196 +//
1.197 +// Get the instance of java.lang.Class corresponding to this klass.
1.198 +// If it is an unloaded instance or array klass, return an unloaded
1.199 +// mirror object of type Class.
1.200 +ciInstance* ciKlass::java_mirror() {
1.201 + GUARDED_VM_ENTRY(
1.202 + if (!is_loaded())
1.203 + return ciEnv::current()->get_unloaded_klass_mirror(this);
1.204 + oop java_mirror = get_Klass()->java_mirror();
1.205 + return CURRENT_ENV->get_instance(java_mirror);
1.206 + )
1.207 +}
1.208 +
1.209 +// ------------------------------------------------------------------
1.210 +// ciKlass::modifier_flags
1.211 +jint ciKlass::modifier_flags() {
1.212 + assert(is_loaded(), "not loaded");
1.213 + GUARDED_VM_ENTRY(
1.214 + return get_Klass()->modifier_flags();
1.215 + )
1.216 +}
1.217 +
1.218 +// ------------------------------------------------------------------
1.219 +// ciKlass::access_flags
1.220 +jint ciKlass::access_flags() {
1.221 + assert(is_loaded(), "not loaded");
1.222 + GUARDED_VM_ENTRY(
1.223 + return get_Klass()->access_flags().as_int();
1.224 + )
1.225 +}
1.226 +
1.227 +// ------------------------------------------------------------------
1.228 +// ciKlass::print_impl
1.229 +//
1.230 +// Implementation of the print method
1.231 +void ciKlass::print_impl(outputStream* st) {
1.232 + st->print(" name=");
1.233 + print_name_on(st);
1.234 +}
1.235 +
1.236 +// ------------------------------------------------------------------
1.237 +// ciKlass::print_name
1.238 +//
1.239 +// Print the name of this klass
1.240 +void ciKlass::print_name_on(outputStream* st) {
1.241 + name()->print_symbol_on(st);
1.242 +}
