1 /* 2 * Copyright (c) 2011, 2019, 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.nodes.spi; 26 27 import org.graalvm.compiler.graph.Node; 28 import org.graalvm.compiler.nodes.ValueNode; 29 import org.graalvm.compiler.nodes.memory.address.AddressNode; 30 31 import jdk.vm.ci.meta.JavaKind; 32 33 /** 34 * Provides a capability for replacing a higher node with one or more lower level nodes. 35 */ 36 public interface LoweringProvider { 37 38 void lower(Node n, LoweringTool tool); 39 40 /** 41 * Reconstructs the array index from an address node that was created as a lowering of an 42 * indexed access to an array. 43 * 44 * @param elementKind the {@link JavaKind} of the array elements 45 * @param address an {@link AddressNode} pointing to an element in an array 46 * @return a node that gives the index of the element 47 */ 48 ValueNode reconstructArrayIndex(JavaKind elementKind, AddressNode address); 49 50 /** 51 * Indicates the smallest width for comparing an integer value on the target platform. 52 */ 53 default Integer smallestCompareWidth() { 54 // most platforms only support 32 and 64 bit compares 55 return 32; 56 } 57 58 /** 59 * Indicates whether the target platform supports bulk zeroing instruction. 60 */ 61 default boolean supportBulkZeroing() { 62 return false; 63 } 64 }