1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.dexgen.rop.cst; 18 19 import com.android.dexgen.rop.type.Type; 20 import com.android.dexgen.util.Hex; 21 22 /** 23 * Constants of type {@code CONSTANT_Integer_info}. 24 */ 25 public final class CstInteger 26 extends CstLiteral32 { 27 /** {@code non-null;} array of cached instances */ 28 private static final CstInteger[] cache = new CstInteger[511]; 29 30 /** {@code non-null;} instance representing {@code -1} */ 31 public static final CstInteger VALUE_M1 = make(-1); 32 33 /** {@code non-null;} instance representing {@code 0} */ 34 public static final CstInteger VALUE_0 = make(0); 35 36 /** {@code non-null;} instance representing {@code 1} */ 37 public static final CstInteger VALUE_1 = make(1); 38 39 /** {@code non-null;} instance representing {@code 2} */ 40 public static final CstInteger VALUE_2 = make(2); 41 42 /** {@code non-null;} instance representing {@code 3} */ 43 public static final CstInteger VALUE_3 = make(3); 44 45 /** {@code non-null;} instance representing {@code 4} */ 46 public static final CstInteger VALUE_4 = make(4); 47 48 /** {@code non-null;} instance representing {@code 5} */ 49 public static final CstInteger VALUE_5 = make(5); 50 51 /** 52 * Makes an instance for the given value. This may (but does not 53 * necessarily) return an already-allocated instance. 54 * 55 * @param value the {@code int} value 56 * @return {@code non-null;} the appropriate instance 57 */ 58 public static CstInteger make(int value) { 59 /* 60 * Note: No need to synchronize, since we don't make any sort 61 * of guarantee about ==, and it's okay to overwrite existing 62 * entries too. 63 */ 64 int idx = (value & 0x7fffffff) % cache.length; 65 CstInteger obj = cache[idx]; 66 67 if ((obj != null) && (obj.getValue() == value)) { 68 return obj; 69 } 70 71 obj = new CstInteger(value); 72 cache[idx] = obj; 73 return obj; 74 } 75 76 /** 77 * Constructs an instance. This constructor is private; use {@link #make}. 78 * 79 * @param value the {@code int} value 80 */ 81 private CstInteger(int value) { 82 super(value); 83 } 84 85 /** {@inheritDoc} */ 86 @Override 87 public String toString() { 88 int value = getIntBits(); 89 return "int{0x" + Hex.u4(value) + " / " + value + '}'; 90 } 91 92 /** {@inheritDoc} */ 93 public Type getType() { 94 return Type.INT; 95 } 96 97 /** {@inheritDoc} */ 98 @Override 99 public String typeName() { 100 return "int"; 101 } 102 103 /** {@inheritDoc} */ 104 public String toHuman() { 105 return Integer.toString(getIntBits()); 106 } 107 108 /** 109 * Gets the {@code int} value. 110 * 111 * @return the value 112 */ 113 public int getValue() { 114 return getIntBits(); 115 } 116 } 117
