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.hotspot.replacements; 24 25 import java.io.ByteArrayOutputStream; 26 import java.io.DataOutputStream; 27 import java.nio.ByteBuffer; 28 29 import org.graalvm.compiler.common.PermanentBailoutException; 30 import org.graalvm.compiler.core.common.type.DataPointerConstant; 31 32 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant; 33 import jdk.vm.ci.hotspot.HotSpotObjectConstant; 34 import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod; 35 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; 36 import jdk.vm.ci.meta.Constant; 37 38 /** 39 * Represents an encoded representation of a constant. 40 */ 41 public final class EncodedSymbolConstant extends DataPointerConstant { 42 private final Constant constant; 43 private byte[] bytes; 44 45 public EncodedSymbolConstant(Constant constant) { 46 super(1); 47 this.constant = constant; 48 } 49 50 @Override 51 public int getSerializedSize() { 52 return getEncodedConstant().length; 53 } 54 55 @Override 56 public void serialize(ByteBuffer buffer) { 57 buffer.put(getEncodedConstant()); 58 } 59 60 /** 61 * Converts a string to a byte array with modified UTF-8 encoding. The first two bytes of the 62 * byte array store the length of the string in bytes. 63 * 64 * @param s a java.lang.String in UTF-16 65 */ 66 private static byte[] toUTF8String(String s) { 67 try (ByteArrayOutputStream bytes = new ByteArrayOutputStream()) { 68 DataOutputStream stream = new DataOutputStream(bytes); 69 stream.writeUTF(s); 70 return bytes.toByteArray(); 71 } catch (Exception e) { 72 throw new PermanentBailoutException(e, "String conversion failed: %s", s); 73 } 74 } 75 76 private static byte[] encodeConstant(Constant constant) { 77 assert constant != null; 78 if (constant instanceof HotSpotObjectConstant) { 79 return toUTF8String(((HotSpotObjectConstant) constant).asObject(String.class)); 80 } else if (constant instanceof HotSpotMetaspaceConstant) { 81 HotSpotMetaspaceConstant metaspaceConstant = ((HotSpotMetaspaceConstant) constant); 82 HotSpotResolvedObjectType klass = metaspaceConstant.asResolvedJavaType(); 83 if (klass != null) { 84 return toUTF8String(klass.getName()); 85 } 86 HotSpotResolvedJavaMethod method = metaspaceConstant.asResolvedJavaMethod(); 87 if (method != null) { 88 byte[] methodName = toUTF8String(method.getName()); 89 byte[] signature = toUTF8String(method.getSignature().toMethodDescriptor()); 90 byte[] result = new byte[methodName.length + signature.length]; 91 int resultPos = 0; 92 System.arraycopy(methodName, 0, result, resultPos, methodName.length); 93 resultPos += methodName.length; 94 System.arraycopy(signature, 0, result, resultPos, signature.length); 95 resultPos += signature.length; 96 assert resultPos == result.length; 97 return result; 98 } 99 100 } 101 throw new PermanentBailoutException("Encoding of constant %s failed", constant); 102 } 103 104 public byte[] getEncodedConstant() { 105 if (bytes == null) { 106 bytes = encodeConstant(constant); 107 } 108 return bytes; 109 } 110 111 @Override 112 public String toValueString() { 113 return "encoded symbol\"" + constant.toValueString() + "\""; 114 } 115 116 }