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/*
* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "ci/ciKlass.hpp"
#include "ci/ciSymbol.hpp"
#include "ci/ciUtilities.hpp"
#include "oops/oop.inline.hpp"
// ciKlass
//
// This class represents a Klass* in the HotSpot virtual
// machine.
// ------------------------------------------------------------------
// ciKlass::ciKlass
ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
assert(get_Klass()->is_klass(), "wrong type");
Klass* k = get_Klass();
_layout_helper = k->layout_helper();
Symbol* klass_name = k->name();
assert(klass_name != NULL, "wrong ciKlass constructor");
_name = CURRENT_ENV->get_symbol(klass_name);
}
// ------------------------------------------------------------------
// ciKlass::ciKlass
//
// Nameless klass variant.
ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
assert(get_Klass()->is_klass(), "wrong type");
_name = name;
_layout_helper = Klass::_lh_neutral_value;
}
// ------------------------------------------------------------------
// ciKlass::ciKlass
//
// Unloaded klass variant.
ciKlass::ciKlass(ciSymbol* name, BasicType bt) : ciType(bt) {
_name = name;
_layout_helper = Klass::_lh_neutral_value;
}
// ------------------------------------------------------------------
// ciKlass::is_subtype_of
bool ciKlass::is_subtype_of(ciKlass* that) {
assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));
// Check to see if the klasses are identical.
if (this == that) {
return true;
}
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
Klass* that_klass = that->get_Klass();
bool result = this_klass->is_subtype_of(that_klass);
return result;
}
// ------------------------------------------------------------------
// ciKlass::is_subclass_of
bool ciKlass::is_subclass_of(ciKlass* that) {
assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
Klass* that_klass = that->get_Klass();
bool result = this_klass->is_subclass_of(that_klass);
return result;
}
// ------------------------------------------------------------------
// ciKlass::super_depth
juint ciKlass::super_depth() {
assert(is_loaded(), "must be loaded");
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
return this_klass->super_depth();
}
// ------------------------------------------------------------------
// ciKlass::super_check_offset
juint ciKlass::super_check_offset() {
assert(is_loaded(), "must be loaded");
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
return this_klass->super_check_offset();
}
// ------------------------------------------------------------------
// ciKlass::super_of_depth
ciKlass* ciKlass::super_of_depth(juint i) {
assert(is_loaded(), "must be loaded");
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
Klass* super = this_klass->primary_super_of_depth(i);
return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL;
}
// ------------------------------------------------------------------
// ciKlass::can_be_primary_super
bool ciKlass::can_be_primary_super() {
assert(is_loaded(), "must be loaded");
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
return this_klass->can_be_primary_super();
}
// ------------------------------------------------------------------
// ciKlass::least_common_ancestor
//
// Get the shared parent of two klasses.
//
// Implementation note: this method currently goes "over the wall"
// and does all of the work on the VM side. It could be rewritten
// to use the super() method and do all of the work (aside from the
// lazy computation of super()) in native mode. This may be
// worthwhile if the compiler is repeatedly requesting the same lca
// computation or possibly if most of the superklasses have already
// been created as ciObjects anyway. Something to think about...
ciKlass*
ciKlass::least_common_ancestor(ciKlass* that) {
assert(is_loaded() && that->is_loaded(), "must be loaded");
// Check to see if the klasses are identical.
if (this == that) {
return this;
}
VM_ENTRY_MARK;
Klass* this_klass = get_Klass();
Klass* that_klass = that->get_Klass();
Klass* lca = this_klass->LCA(that_klass);
// Many times the LCA will be either this_klass or that_klass.
// Treat these as special cases.
if (lca == that_klass) {
return that;
}
if (this_klass == lca) {
return this;
}
// Create the ciInstanceKlass for the lca.
ciKlass* result =
CURRENT_THREAD_ENV->get_klass(lca);
return result;
}
// ------------------------------------------------------------------
// ciKlass::find_klass
//
// Find a klass using this klass's class loader.
ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
assert(is_loaded(), "cannot find_klass through an unloaded klass");
return CURRENT_ENV->get_klass_by_name(this,
klass_name, false);
}
// ------------------------------------------------------------------
// ciKlass::java_mirror
//
// Get the instance of java.lang.Class corresponding to this klass.
// If it is an unloaded instance or array klass, return an unloaded
// mirror object of type Class.
ciInstance* ciKlass::java_mirror() {
GUARDED_VM_ENTRY(
if (!is_loaded())
return ciEnv::current()->get_unloaded_klass_mirror(this);
oop java_mirror = get_Klass()->java_mirror();
return CURRENT_ENV->get_instance(java_mirror);
)
}
// ------------------------------------------------------------------
// ciKlass::modifier_flags
jint ciKlass::modifier_flags() {
assert(is_loaded(), "not loaded");
GUARDED_VM_ENTRY(
return get_Klass()->modifier_flags();
)
}
// ------------------------------------------------------------------
// ciKlass::access_flags
jint ciKlass::access_flags() {
assert(is_loaded(), "not loaded");
GUARDED_VM_ENTRY(
return get_Klass()->access_flags().as_int();
)
}
// ------------------------------------------------------------------
// ciKlass::print_impl
//
// Implementation of the print method
void ciKlass::print_impl(outputStream* st) {
st->print(" name=");
print_name_on(st);
}
// ------------------------------------------------------------------
// ciKlass::print_name
//
// Print the name of this klass
void ciKlass::print_name_on(outputStream* st) {
name()->print_symbol_on(st);
}
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