| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dx.rop.cst; |
| |
| /** |
| * Constants which are literal bitwise values of some sort. |
| */ |
| public abstract class CstLiteralBits |
| extends TypedConstant { |
| /** |
| * Returns whether or not this instance's value may be accurately |
| * represented as an {@code int}. The rule is that if there |
| * is an {@code int} which may be sign-extended to yield this |
| * instance's value, then this method returns {@code true}. |
| * Otherwise, it returns {@code false}. |
| * |
| * @return {@code true} iff this instance fits in an {@code int} |
| */ |
| public abstract boolean fitsInInt(); |
| |
| /** |
| * Gets the value as {@code int} bits. If this instance contains |
| * more bits than fit in an {@code int}, then this returns only |
| * the low-order bits. |
| * |
| * @return the bits |
| */ |
| public abstract int getIntBits(); |
| |
| /** |
| * Gets the value as {@code long} bits. If this instance contains |
| * fewer bits than fit in a {@code long}, then the result of this |
| * method is the sign extension of the value. |
| * |
| * @return the bits |
| */ |
| public abstract long getLongBits(); |
| |
| /** |
| * Returns true if this value can fit in 16 bits with sign-extension. |
| * |
| * @return true if the sign-extended lower 16 bits are the same as |
| * the value. |
| */ |
| public boolean fitsIn16Bits() { |
| if (! fitsInInt()) { |
| return false; |
| } |
| |
| int bits = getIntBits(); |
| return (short) bits == bits; |
| } |
| |
| /** |
| * Returns true if this value can fit in 8 bits with sign-extension. |
| * |
| * @return true if the sign-extended lower 8 bits are the same as |
| * the value. |
| */ |
| public boolean fitsIn8Bits() { |
| if (! fitsInInt()) { |
| return false; |
| } |
| |
| int bits = getIntBits(); |
| return (byte) bits == bits; |
| } |
| } |