1917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul/* 2917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Copyright (C) 2007 The Android Open Source Project 3917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 4917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Licensed under the Apache License, Version 2.0 (the "License"); 5917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * you may not use this file except in compliance with the License. 6917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * You may obtain a copy of the License at 7917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 8917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * http://www.apache.org/licenses/LICENSE-2.0 9917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 10917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Unless required by applicable law or agreed to in writing, software 11917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * distributed under the License is distributed on an "AS IS" BASIS, 12917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * See the License for the specific language governing permissions and 14917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * limitations under the License. 15917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 16917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 17917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgulpackage com.android.dexgen.rop.cst; 18917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 19917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul/** 20917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Constants which are literal bitwise values of some sort. 21917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 22917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgulpublic abstract class CstLiteralBits 23917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul extends TypedConstant { 24917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul /** 25917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Returns whether or not this instance's value may be accurately 26917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * represented as an {@code int}. The rule is that if there 27917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * is an {@code int} which may be sign-extended to yield this 28917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * instance's value, then this method returns {@code true}. 29917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Otherwise, it returns {@code false}. 30917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 31917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * @return {@code true} iff this instance fits in an {@code int} 32917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 33917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul public abstract boolean fitsInInt(); 34917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 35917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul /** 36917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Gets the value as {@code int} bits. If this instance contains 37917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * more bits than fit in an {@code int}, then this returns only 38917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * the low-order bits. 39917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 40917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * @return the bits 41917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 42917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul public abstract int getIntBits(); 43917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 44917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul /** 45917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Gets the value as {@code long} bits. If this instance contains 46917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * fewer bits than fit in a {@code long}, then the result of this 47917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * method is the sign extension of the value. 48917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 49917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * @return the bits 50917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 51917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul public abstract long getLongBits(); 52917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 53917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul /** 54917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Returns true if this value can fit in 16 bits with sign-extension. 55917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 56917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * @return true if the sign-extended lower 16 bits are the same as 57917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * the value. 58917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 59917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul public boolean fitsIn16Bits() { 60917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul if (! fitsInInt()) { 61917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul return false; 62917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul } 63917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 64917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul int bits = getIntBits(); 65917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul return (short) bits == bits; 66917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul } 67917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 68917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul /** 69917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * Returns true if this value can fit in 8 bits with sign-extension. 70917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * 71917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * @return true if the sign-extended lower 8 bits are the same as 72917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul * the value. 73917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul */ 74917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul public boolean fitsIn8Bits() { 75917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul if (! fitsInInt()) { 76917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul return false; 77917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul } 78917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul 79917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul int bits = getIntBits(); 80917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul return (byte) bits == bits; 81917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul } 82917cb222329ee8c035c3ffaf947e4265761b9367Piotr Gurgul} 83