1 /* 2 * Copyright (c) 2014, 2018, 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 package org.graalvm.compiler.core.common.type; 26 27 import jdk.vm.ci.meta.Constant; 28 import jdk.vm.ci.meta.MemoryAccessProvider; 29 30 /** 31 * Type describing primitive values. 32 */ 33 public abstract class PrimitiveStamp extends ArithmeticStamp { 34 35 private final int bits; 36 37 protected PrimitiveStamp(int bits, ArithmeticOpTable ops) { 38 super(ops); 39 this.bits = bits; 40 } 41 42 /** 43 * The width in bits of the value described by this stamp. 44 */ 45 public int getBits() { 46 return bits; 47 } 48 49 public static int getBits(Stamp stamp) { 50 if (stamp instanceof PrimitiveStamp) { 51 return ((PrimitiveStamp) stamp).getBits(); 52 } else { 53 return 0; 54 } 55 } 56 57 @Override 58 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { 59 try { 60 return provider.readPrimitiveConstant(getStackKind(), base, displacement, getBits()); 61 } catch (IllegalArgumentException e) { 62 /* 63 * It's possible that the base and displacement aren't valid together so simply return 64 * null. 65 */ 66 return null; 67 } 68 } 69 70 @Override 71 public int hashCode() { 72 final int prime = 31; 73 int result = super.hashCode(); 74 result = prime * result + bits; 75 return result; 76 } 77 78 @Override 79 public boolean equals(Object obj) { 80 if (this == obj) { 81 return true; 82 } 83 if (!(obj instanceof PrimitiveStamp)) { 84 return false; 85 } 86 PrimitiveStamp other = (PrimitiveStamp) obj; 87 if (bits != other.bits) { 88 return false; 89 } 90 return super.equals(obj); 91 } 92 }