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/ciArray.hpp"
27#include "ci/ciArrayKlass.hpp"
28#include "ci/ciConstant.hpp"
29#include "ci/ciKlass.hpp"
30#include "ci/ciUtilities.hpp"
31#include "oops/objArrayOop.inline.hpp"
32#include "oops/oop.inline.hpp"
33#include "oops/typeArrayOop.hpp"
34
35// ciArray
36//
37// This class represents an arrayOop in the HotSpot virtual
38// machine.
39static BasicType fixup_element_type(BasicType bt) {
40  if (bt == T_ARRAY)    return T_OBJECT;
41  if (bt == T_BOOLEAN)  return T_BYTE;
42  return bt;
43}
44
45ciConstant ciArray::element_value_impl(BasicType elembt,
46                                       arrayOop ary,
47                                       int index) {
48  if (ary == NULL)
49    return ciConstant();
50  assert(ary->is_array(), "");
51  if (index < 0 || index >= ary->length())
52    return ciConstant();
53  ArrayKlass* ak = (ArrayKlass*) ary->klass();
54  BasicType abt = ak->element_type();
55  if (fixup_element_type(elembt) !=
56      fixup_element_type(abt))
57    return ciConstant();
58  switch (elembt) {
59  case T_ARRAY:
60  case T_OBJECT:
61    {
62      assert(ary->is_objArray(), "");
63      objArrayOop objary = (objArrayOop) ary;
64      oop elem = objary->obj_at(index);
65      ciEnv* env = CURRENT_ENV;
66      ciObject* box = env->get_object(elem);
67      return ciConstant(T_OBJECT, box);
68    }
69  default:
70    break;
71  }
72  assert(ary->is_typeArray(), "");
73  typeArrayOop tary = (typeArrayOop) ary;
74  jint value = 0;
75  switch (elembt) {
76  case T_LONG:          return ciConstant(tary->long_at(index));
77  case T_FLOAT:         return ciConstant(tary->float_at(index));
78  case T_DOUBLE:        return ciConstant(tary->double_at(index));
79  default:              return ciConstant();
80  case T_BYTE:          value = tary->byte_at(index);           break;
81  case T_BOOLEAN:       value = tary->byte_at(index) & 1;       break;
82  case T_SHORT:         value = tary->short_at(index);          break;
83  case T_CHAR:          value = tary->char_at(index);           break;
84  case T_INT:           value = tary->int_at(index);            break;
85  }
86  return ciConstant(elembt, value);
87}
88
89// ------------------------------------------------------------------
90// ciArray::element_value
91//
92// Current value of an element.
93// Returns T_ILLEGAL if there is no element at the given index.
94ciConstant ciArray::element_value(int index) {
95  BasicType elembt = element_basic_type();
96  GUARDED_VM_ENTRY(
97    return element_value_impl(elembt, get_arrayOop(), index);
98  )
99}
100
101// ------------------------------------------------------------------
102// ciArray::element_value_by_offset
103//
104// Current value of an element at the specified offset.
105// Returns T_ILLEGAL if there is no element at the given offset.
106ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
107  BasicType elembt = element_basic_type();
108  intptr_t shift  = exact_log2(type2aelembytes(elembt));
109  intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
110  intptr_t index = (element_offset - header) >> shift;
111  intptr_t offset = header + ((intptr_t)index << shift);
112  if (offset != element_offset || index != (jint)index || index < 0 || index >= length()) {
113    return ciConstant();
114  }
115  return element_value((jint) index);
116}
117
118// ------------------------------------------------------------------
119// ciArray::print_impl
120//
121// Implementation of the print method.
122void ciArray::print_impl(outputStream* st) {
123  st->print(" length=%d type=", length());
124  klass()->print(st);
125}
126