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/ciUtilities.inline.hpp"
  31 #include "ci/ciValueArrayKlass.hpp"
  32 #include "ci/ciValueKlass.hpp"
  33 
  34 // ciArrayKlass
  35 //
  36 // This class represents a Klass* in the HotSpot virtual machine
  37 // whose Klass part in an ArrayKlass.
  38 
  39 // ------------------------------------------------------------------
  40 // ciArrayKlass::ciArrayKlass
  41 //
  42 // Loaded array klass.
  43 ciArrayKlass::ciArrayKlass(Klass* k) : ciKlass(k) {
  44   assert(get_Klass()->is_array_klass(), "wrong type");
  45   _dimension = get_ArrayKlass()->dimension();
  46 }
  47 
  48 // ------------------------------------------------------------------
  49 // ciArrayKlass::ciArrayKlass
  50 //
  51 // Unloaded array klass.
  52 ciArrayKlass::ciArrayKlass(ciSymbol* name, int dimension, BasicType bt)
  53   : ciKlass(name, bt) {
  54   _dimension = dimension;
  55 }
  56 
  57 // ------------------------------------------------------------------
  58 // ciArrayKlass::element_type
  59 //
  60 // What type is obtained when this array is indexed once?
  61 ciType* ciArrayKlass::element_type() {
  62   if (is_type_array_klass()) {
  63     return ciType::make(as_type_array_klass()->element_type());
  64   } else {
  65     return element_klass()->as_klass();
  66   }
  67 }
  68 
  69 
  70 // ------------------------------------------------------------------
  71 // ciArrayKlass::base_element_type
  72 //
  73 // What type is obtained when this array is indexed as many times as possible?
  74 ciType* ciArrayKlass::base_element_type() {
  75   if (is_type_array_klass()) {
  76     return ciType::make(as_type_array_klass()->element_type());
  77   } else if (is_obj_array_klass()) {
  78     ciKlass* ek = as_obj_array_klass()->base_element_klass();
  79     if (ek->is_type_array_klass()) {
  80       return ciType::make(ek->as_type_array_klass()->element_type());
  81     }
  82     return ek;
  83   } else {
  84     return as_value_array_klass()->base_element_klass();
  85   }
  86 }
  87 
  88 
  89 // ------------------------------------------------------------------
  90 // ciArrayKlass::is_leaf_type
  91 bool ciArrayKlass::is_leaf_type() {
  92   if (is_type_array_klass()) {
  93     return true;
  94   } else {
  95     return as_obj_array_klass()->base_element_klass()->is_leaf_type();
  96   }
  97 }
  98 
  99 
 100 // ------------------------------------------------------------------
 101 // ciArrayKlass::base_element_type
 102 //
 103 // What type is obtained when this array is indexed as many times as possible?
 104 ciArrayKlass* ciArrayKlass::make(ciType* element_type, bool never_null) {
 105   if (element_type->is_primitive_type()) {
 106     return ciTypeArrayKlass::make(element_type->basic_type());
 107   } else if (element_type->is_valuetype() && element_type->as_value_klass()->flatten_array() && never_null) {
 108     return ciValueArrayKlass::make(element_type->as_klass());
 109   } else {
 110     return ciObjArrayKlass::make(element_type->as_klass(), never_null);
 111   }
 112 }
 113 
 114 int ciArrayKlass::array_header_in_bytes() {
 115   return get_ArrayKlass()->array_header_in_bytes();
 116 }
 117 
 118 ArrayStorageProperties ciArrayKlass::storage_properties() {
 119   return get_ArrayKlass()->storage_properties();
 120 }
 121 
 122 ciInstance* ciArrayKlass::component_mirror_instance() const {
 123   GUARDED_VM_ENTRY(
 124     oop component_mirror = ArrayKlass::cast(get_Klass())->component_mirror();
 125     return CURRENT_ENV->get_instance(component_mirror);
 126   )
 127 }