Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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(is_loaded() && that->is_loaded(), "must be loaded");

   // 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(is_loaded() && that->is_loaded(), "must be loaded");

   // Check to see if the klasses are identical.

   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);

 }