aoqi@0: /*
aoqi@0:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "ci/ciConstant.hpp"
aoqi@0: #include "ci/ciField.hpp"
aoqi@0: #include "ci/ciInstance.hpp"
aoqi@0: #include "ci/ciInstanceKlass.hpp"
aoqi@0: #include "ci/ciUtilities.hpp"
aoqi@0: #include "classfile/systemDictionary.hpp"
aoqi@0: #include "oops/oop.inline.hpp"
aoqi@0: 
aoqi@0: // ciInstance
aoqi@0: //
aoqi@0: // This class represents an instanceOop in the HotSpot virtual
aoqi@0: // machine.
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciObject::java_mirror_type
aoqi@0: ciType* ciInstance::java_mirror_type() {
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   oop m = get_oop();
aoqi@0:   // Return NULL if it is not java.lang.Class.
aoqi@0:   if (m == NULL || m->klass() != SystemDictionary::Class_klass()) {
aoqi@0:     return NULL;
aoqi@0:   }
aoqi@0:   // Return either a primitive type or a klass.
aoqi@0:   if (java_lang_Class::is_primitive(m)) {
aoqi@0:     return ciType::make(java_lang_Class::primitive_type(m));
aoqi@0:   } else {
aoqi@0:     Klass* k = java_lang_Class::as_Klass(m);
aoqi@0:     assert(k != NULL, "");
aoqi@0:     return CURRENT_THREAD_ENV->get_klass(k);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciInstance::field_value
aoqi@0: //
aoqi@0: // Constant value of a field.
aoqi@0: ciConstant ciInstance::field_value(ciField* field) {
aoqi@0:   assert(is_loaded(), "invalid access - must be loaded");
aoqi@0:   assert(field->holder()->is_loaded(), "invalid access - holder must be loaded");
aoqi@0:   assert(klass()->is_subclass_of(field->holder()), "invalid access - must be subclass");
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   ciConstant result;
aoqi@0:   Handle obj = get_oop();
aoqi@0:   assert(!obj.is_null(), "bad oop");
aoqi@0:   BasicType field_btype = field->type()->basic_type();
aoqi@0:   int offset = field->offset();
aoqi@0: 
aoqi@0:   switch(field_btype) {
aoqi@0:   case T_BYTE:
aoqi@0:     return ciConstant(field_btype, obj->byte_field(offset));
aoqi@0:     break;
aoqi@0:   case T_CHAR:
aoqi@0:     return ciConstant(field_btype, obj->char_field(offset));
aoqi@0:     break;
aoqi@0:   case T_SHORT:
aoqi@0:     return ciConstant(field_btype, obj->short_field(offset));
aoqi@0:     break;
aoqi@0:   case T_BOOLEAN:
aoqi@0:     return ciConstant(field_btype, obj->bool_field(offset));
aoqi@0:     break;
aoqi@0:   case T_INT:
aoqi@0:     return ciConstant(field_btype, obj->int_field(offset));
aoqi@0:     break;
aoqi@0:   case T_FLOAT:
aoqi@0:     return ciConstant(obj->float_field(offset));
aoqi@0:     break;
aoqi@0:   case T_DOUBLE:
aoqi@0:     return ciConstant(obj->double_field(offset));
aoqi@0:     break;
aoqi@0:   case T_LONG:
aoqi@0:     return ciConstant(obj->long_field(offset));
aoqi@0:     break;
aoqi@0:   case T_OBJECT:
aoqi@0:   case T_ARRAY:
aoqi@0:     {
aoqi@0:       oop o = obj->obj_field(offset);
aoqi@0: 
aoqi@0:       // A field will be "constant" if it is known always to be
aoqi@0:       // a non-null reference to an instance of a particular class,
aoqi@0:       // or to a particular array.  This can happen even if the instance
aoqi@0:       // or array is not perm.  In such a case, an "unloaded" ciArray
aoqi@0:       // or ciInstance is created.  The compiler may be able to use
aoqi@0:       // information about the object's class (which is exact) or length.
aoqi@0: 
aoqi@0:       if (o == NULL) {
aoqi@0:         return ciConstant(field_btype, ciNullObject::make());
aoqi@0:       } else {
aoqi@0:         return ciConstant(field_btype, CURRENT_ENV->get_object(o));
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0:   ShouldNotReachHere();
aoqi@0:   // to shut up the compiler
aoqi@0:   return ciConstant();
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciInstance::field_value_by_offset
aoqi@0: //
aoqi@0: // Constant value of a field at the specified offset.
aoqi@0: ciConstant ciInstance::field_value_by_offset(int field_offset) {
aoqi@0:   ciInstanceKlass* ik = klass()->as_instance_klass();
aoqi@0:   ciField* field = ik->get_field_by_offset(field_offset, false);
aoqi@0:   if (field == NULL)
aoqi@0:     return ciConstant();  // T_ILLEGAL
aoqi@0:   return field_value(field);
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciInstance::print_impl
aoqi@0: //
aoqi@0: // Implementation of the print method.
aoqi@0: void ciInstance::print_impl(outputStream* st) {
aoqi@0:   st->print(" type=");
aoqi@0:   klass()->print(st);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: ciKlass* ciInstance::java_lang_Class_klass() {
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass();
aoqi@0: }