1 /* 2 * Copyright (c) 2011, 2016, 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.core.common.spi.ArrayOffsetProvider; 28 import org.graalvm.compiler.graph.Node; 29 import org.graalvm.compiler.nodes.ValueNode; 30 import org.graalvm.compiler.nodes.memory.address.AddressNode; 31 32 import jdk.vm.ci.meta.JavaKind; 33 34 /** 35 * Provides a capability for replacing a higher node with one or more lower level nodes. 36 */ 37 public interface LoweringProvider extends ArrayOffsetProvider { 38 39 void lower(Node n, LoweringTool tool); 40 41 /** 42 * Reconstructs the array index from an address node that was created as a lowering of an 43 * indexed access to an array. 44 * 45 * @param elementKind the {@link JavaKind} of the array elements 46 * @param address an {@link AddressNode} pointing to an element in an array 47 * @return a node that gives the index of the element 48 */ 49 ValueNode reconstructArrayIndex(JavaKind elementKind, AddressNode address); 50 51 /** 52 * Indicates the smallest width for comparing an integer value on the target platform. 53 */ 54 default Integer smallestCompareWidth() { 55 // most platforms only support 32 and 64 bit compares 56 return 32; 57 } 58 }