1 /* 2 * Copyright (c) 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 package org.graalvm.compiler.nodes.util; 24 25 import org.graalvm.compiler.core.common.spi.ConstantFieldProvider; 26 import org.graalvm.compiler.core.common.spi.ConstantFieldProvider.ConstantFieldTool; 27 import org.graalvm.compiler.nodes.ConstantNode; 28 29 import jdk.vm.ci.meta.ConstantReflectionProvider; 30 import jdk.vm.ci.meta.JavaConstant; 31 import jdk.vm.ci.meta.MetaAccessProvider; 32 import jdk.vm.ci.meta.ResolvedJavaField; 33 34 public class ConstantFoldUtil { 35 36 public static ConstantNode tryConstantFold(ConstantFieldProvider fieldProvider, ConstantReflectionProvider constantReflection, MetaAccessProvider metaAccess, ResolvedJavaField field, 37 JavaConstant receiver) { 38 if (!field.isStatic()) { 39 if (receiver == null || receiver.isNull()) { 40 return null; 41 } 42 } 43 44 return fieldProvider.readConstantField(field, new ConstantFieldTool<ConstantNode>() { 45 46 @Override 47 public JavaConstant readValue() { 48 return constantReflection.readFieldValue(field, receiver); 49 } 50 51 @Override 52 public JavaConstant getReceiver() { 53 return receiver; 54 } 55 56 @Override 57 public ConstantNode foldConstant(JavaConstant ret) { 58 if (ret != null) { 59 return ConstantNode.forConstant(ret, metaAccess); 60 } else { 61 return null; 62 } 63 } 64 65 @Override 66 public ConstantNode foldStableArray(JavaConstant ret, int stableDimensions, boolean isDefaultStable) { 67 if (ret != null) { 68 return ConstantNode.forConstant(ret, stableDimensions, isDefaultStable, metaAccess); 69 } else { 70 return null; 71 } 72 } 73 }); 74 } 75 }