1 /* 2 * Copyright (c) 2016, 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.spi; 26 27 import org.graalvm.compiler.options.OptionValues; 28 29 import jdk.vm.ci.meta.JavaConstant; 30 import jdk.vm.ci.meta.ResolvedJavaField; 31 32 /** 33 * Implements the logic that decides whether a field read should be constant folded. 34 */ 35 public interface ConstantFieldProvider { 36 37 public interface ConstantFieldTool<T> { 38 39 OptionValues getOptions(); 40 41 JavaConstant readValue(); 42 43 JavaConstant getReceiver(); 44 45 T foldConstant(JavaConstant ret); 46 47 T foldStableArray(JavaConstant ret, int stableDimensions, boolean isDefaultStable); 48 } 49 50 /** 51 * Decide whether a read from the {@code field} should be constant folded. This should return 52 * {@link ConstantFieldTool#foldConstant} or {@link ConstantFieldTool#foldStableArray} if the 53 * read should be constant folded, or {@code null} otherwise. 54 */ 55 <T> T readConstantField(ResolvedJavaField field, ConstantFieldTool<T> tool); 56 }