jdk

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/*
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 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "ci/ciConstant.hpp"
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#include "ci/ciField.hpp"
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#include "ci/ciInstance.hpp"
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#include "ci/ciInstanceKlass.hpp"
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#include "ci/ciNullObject.hpp"
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#include "ci/ciUtilities.inline.hpp"
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#include "classfile/vmClasses.hpp"
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#include "oops/oop.inline.hpp"
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// ciInstance
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//
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// This class represents an instanceOop in the HotSpot virtual
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// machine.
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// ------------------------------------------------------------------
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// ciObject::java_mirror_type
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ciType* ciInstance::java_mirror_type() {
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  VM_ENTRY_MARK;
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  oop m = get_oop();
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  // Return null if it is not java.lang.Class.
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  if (m == nullptr || m->klass() != vmClasses::Class_klass()) {
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    return nullptr;
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  }
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  // Return either a primitive type or a klass.
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  if (java_lang_Class::is_primitive(m)) {
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    return ciType::make(java_lang_Class::primitive_type(m));
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  } else {
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    Klass* k = java_lang_Class::as_Klass(m);
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    assert(k != nullptr, "");
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    return CURRENT_THREAD_ENV->get_klass(k);
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  }
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}
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// ------------------------------------------------------------------
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// ciInstance::field_value_impl
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ciConstant ciInstance::field_value_impl(BasicType field_btype, int offset) {
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  ciConstant value = check_constant_value_cache(offset, field_btype);
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  if (value.is_valid()) {
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    return value;
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  }
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  VM_ENTRY_MARK;
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  oop obj = get_oop();
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  assert(obj != nullptr, "bad oop");
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  switch(field_btype) {
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    case T_BYTE:    value = ciConstant(field_btype, obj->byte_field(offset)); break;
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    case T_CHAR:    value = ciConstant(field_btype, obj->char_field(offset)); break;
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    case T_SHORT:   value = ciConstant(field_btype, obj->short_field(offset)); break;
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    case T_BOOLEAN: value = ciConstant(field_btype, obj->bool_field(offset)); break;
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    case T_INT:     value = ciConstant(field_btype, obj->int_field(offset)); break;
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    case T_FLOAT:   value = ciConstant(obj->float_field(offset)); break;
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    case T_DOUBLE:  value = ciConstant(obj->double_field(offset)); break;
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    case T_LONG:    value = ciConstant(obj->long_field(offset)); break;
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    case T_OBJECT:  // fall through
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    case T_ARRAY: {
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      oop o = obj->obj_field(offset);
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      // A field will be "constant" if it is known always to be
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      // a non-null reference to an instance of a particular class,
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      // or to a particular array.  This can happen even if the instance
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      // or array is not perm.  In such a case, an "unloaded" ciArray
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      // or ciInstance is created.  The compiler may be able to use
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      // information about the object's class (which is exact) or length.
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      if (o == nullptr) {
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        value = ciConstant(field_btype, ciNullObject::make());
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      } else {
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        value = ciConstant(field_btype, CURRENT_ENV->get_object(o));
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      }
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      break;
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    }
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    default:
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      fatal("no field value: %s", type2name(field_btype));
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  }
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  add_to_constant_value_cache(offset, value);
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  return value;
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}
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// ------------------------------------------------------------------
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// ciInstance::field_value
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//
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// Constant value of a field.
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ciConstant ciInstance::field_value(ciField* field) {
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  assert(is_loaded(), "invalid access - must be loaded");
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  assert(field->holder()->is_loaded(), "invalid access - holder must be loaded");
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  assert(field->is_static() || klass()->is_subclass_of(field->holder()), "invalid access - must be subclass");
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  return field_value_impl(field->type()->basic_type(), field->offset_in_bytes());
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}
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// ------------------------------------------------------------------
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// ciInstance::field_value_by_offset
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//
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// Constant value of a field at the specified offset.
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ciConstant ciInstance::field_value_by_offset(int field_offset) {
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  ciInstanceKlass* ik = klass()->as_instance_klass();
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  ciField* field = ik->get_field_by_offset(field_offset, false);
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  if (field == nullptr)
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    return ciConstant();  // T_ILLEGAL
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  return field_value(field);
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}
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// ------------------------------------------------------------------
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// ciInstance::print_impl
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//
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// Implementation of the print method.
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void ciInstance::print_impl(outputStream* st) {
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  st->print(" type=");
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  klass()->print(st);
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}
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ciKlass* ciInstance::java_lang_Class_klass() {
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  VM_ENTRY_MARK;
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  assert(java_lang_Class::as_Klass(get_oop()) != nullptr, "klass is null");
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  return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass();
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}
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