1 /*
   2  * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "ci/ciArrayKlass.hpp"
  27 #include "ci/ciObjArrayKlass.hpp"
  28 #include "ci/ciTypeArrayKlass.hpp"
  29 #include "ci/ciUtilities.hpp"
  30 #include "ci/ciValueArrayKlass.hpp"
  31 #include "ci/ciValueKlass.hpp"
  32 
  33 // ciArrayKlass
  34 //
  35 // This class represents a Klass* in the HotSpot virtual machine
  36 // whose Klass part in an ArrayKlass.
  37 
  38 // ------------------------------------------------------------------
  39 // ciArrayKlass::ciArrayKlass
  40 //
  41 // Loaded array klass.
  42 ciArrayKlass::ciArrayKlass(Klass* k) : ciKlass(k) {
  43   assert(get_Klass()->is_array_klass(), "wrong type");
  44   _dimension = get_ArrayKlass()->dimension();
  45 }
  46 
  47 // ------------------------------------------------------------------
  48 // ciArrayKlass::ciArrayKlass
  49 //
  50 // Unloaded array klass.
  51 ciArrayKlass::ciArrayKlass(ciSymbol* name, int dimension, BasicType bt)
  52   : ciKlass(name, bt) {
  53   _dimension = dimension;
  54 }
  55 
  56 // ------------------------------------------------------------------
  57 // ciArrayKlass::element_type
  58 //
  59 // What type is obtained when this array is indexed once?
  60 ciType* ciArrayKlass::element_type() {
  61   if (is_type_array_klass()) {
  62     return ciType::make(as_type_array_klass()->element_type());
  63   } else {
  64     return element_klass()->as_klass();
  65   }
  66 }
  67 
  68 
  69 // ------------------------------------------------------------------
  70 // ciArrayKlass::base_element_type
  71 //
  72 // What type is obtained when this array is indexed as many times as possible?
  73 ciType* ciArrayKlass::base_element_type() {
  74   if (is_type_array_klass()) {
  75     return ciType::make(as_type_array_klass()->element_type());
  76   } else if (is_obj_array_klass()) {
  77     ciKlass* ek = as_obj_array_klass()->base_element_klass();
  78     if (ek->is_type_array_klass()) {
  79       return ciType::make(ek->as_type_array_klass()->element_type());
  80     }
  81     return ek;
  82   } else {
  83     return as_value_array_klass()->base_element_klass();
  84   }
  85 }
  86 
  87 
  88 // ------------------------------------------------------------------
  89 // ciArrayKlass::is_leaf_type
  90 bool ciArrayKlass::is_leaf_type() {
  91   if (is_type_array_klass()) {
  92     return true;
  93   } else {
  94     return as_obj_array_klass()->base_element_klass()->is_leaf_type();
  95   }
  96 }
  97 
  98 
  99 // ------------------------------------------------------------------
 100 // ciArrayKlass::base_element_type
 101 //
 102 // What type is obtained when this array is indexed as many times as possible?
 103 ciArrayKlass* ciArrayKlass::make(ciType* element_type) {
 104   if (element_type->is_primitive_type()) {
 105     return ciTypeArrayKlass::make(element_type->basic_type());
 106   } else if (element_type->is_valuetype() && element_type->as_value_klass()->flatten_array()) {
 107     return ciValueArrayKlass::make(element_type->as_klass());
 108   } else {
 109     return ciObjArrayKlass::make(element_type->as_klass());
 110   }
 111 }
 112 
 113 int ciArrayKlass::array_header_in_bytes() {
 114   return get_ArrayKlass()->array_header_in_bytes();
 115 }