jdk

Форк
0
/
ciArray.cpp 
130 строк · 4.6 Кб
1
/*
2
 * Copyright (c) 1999, 2023, 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.inline.hpp"
31
#include "oops/objArrayOop.inline.hpp"
32
#include "oops/oop.inline.hpp"
33
#include "oops/typeArrayOop.inline.hpp"
34
#include "utilities/powerOfTwo.hpp"
35

36
// ciArray
37
//
38
// This class represents an arrayOop in the HotSpot virtual
39
// machine.
40
static BasicType fixup_element_type(BasicType bt) {
41
  if (is_reference_type(bt))  return T_OBJECT;
42
  if (bt == T_BOOLEAN)  return T_BYTE;
43
  return bt;
44
}
45

46
ciConstant ciArray::element_value_impl(BasicType elembt,
47
                                       arrayOop ary,
48
                                       int index) {
49
  if (ary == nullptr)
50
    return ciConstant();
51
  assert(ary->is_array(), "");
52
  if (index < 0 || index >= ary->length())
53
    return ciConstant();
54
  ArrayKlass* ak = (ArrayKlass*) ary->klass();
55
  BasicType abt = ak->element_type();
56
  if (fixup_element_type(elembt) !=
57
      fixup_element_type(abt))
58
    return ciConstant();
59
  switch (elembt) {
60
  case T_ARRAY:
61
  case T_OBJECT:
62
    {
63
      assert(ary->is_objArray(), "");
64
      objArrayOop objary = (objArrayOop) ary;
65
      oop elem = objary->obj_at(index);
66
      return ciConstant(elembt, CURRENT_ENV->get_object(elem));
67
    }
68
  default:
69
    break;
70
  }
71
  assert(ary->is_typeArray(), "");
72
  typeArrayOop tary = (typeArrayOop) ary;
73
  jint value = 0;
74
  switch (elembt) {
75
  case T_LONG:          return ciConstant(tary->long_at(index));
76
  case T_FLOAT:         return ciConstant(tary->float_at(index));
77
  case T_DOUBLE:        return ciConstant(tary->double_at(index));
78
  default:              return ciConstant();
79
  case T_BYTE:          value = tary->byte_at(index);           break;
80
  case T_BOOLEAN:       value = tary->byte_at(index) & 1;       break;
81
  case T_SHORT:         value = tary->short_at(index);          break;
82
  case T_CHAR:          value = tary->char_at(index);           break;
83
  case T_INT:           value = tary->int_at(index);            break;
84
  }
85
  return ciConstant(elembt, value);
86
}
87

88
// ------------------------------------------------------------------
89
// ciArray::element_value
90
//
91
// Current value of an element.
92
// Returns T_ILLEGAL if there is no element at the given index.
93
ciConstant ciArray::element_value(int index) {
94
  BasicType elembt = element_basic_type();
95
  ciConstant value = check_constant_value_cache(index, elembt);
96
  if (value.is_valid()) {
97
    return value;
98
  }
99
  GUARDED_VM_ENTRY(
100
    value = element_value_impl(elembt, get_arrayOop(), index);
101
  )
102
  add_to_constant_value_cache(index, value);
103
  return value;
104
}
105

106
// ------------------------------------------------------------------
107
// ciArray::element_value_by_offset
108
//
109
// Current value of an element at the specified offset.
110
// Returns T_ILLEGAL if there is no element at the given offset.
111
ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
112
  BasicType elembt = element_basic_type();
113
  intptr_t shift  = exact_log2(type2aelembytes(elembt));
114
  intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
115
  intptr_t index = (element_offset - header) >> shift;
116
  intptr_t offset = header + ((intptr_t)index << shift);
117
  if (offset != element_offset || index != (jint)index || index < 0 || index >= length()) {
118
    return ciConstant();
119
  }
120
  return element_value((jint) index);
121
}
122

123
// ------------------------------------------------------------------
124
// ciArray::print_impl
125
//
126
// Implementation of the print method.
127
void ciArray::print_impl(outputStream* st) {
128
  st->print(" length=%d type=", length());
129
  klass()->print(st);
130
}
131

Использование cookies

Мы используем файлы cookie в соответствии с Политикой конфиденциальности и Политикой использования cookies.

Нажимая кнопку «Принимаю», Вы даете АО «СберТех» согласие на обработку Ваших персональных данных в целях совершенствования нашего веб-сайта и Сервиса GitVerse, а также повышения удобства их использования.

Запретить использование cookies Вы можете самостоятельно в настройках Вашего браузера.