| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.hotspot.replacements; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataOutputStream; |
| import java.nio.ByteBuffer; |
| |
| import org.graalvm.compiler.common.PermanentBailoutException; |
| import org.graalvm.compiler.core.common.type.DataPointerConstant; |
| |
| import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant; |
| import jdk.vm.ci.hotspot.HotSpotObjectConstant; |
| import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod; |
| import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; |
| import jdk.vm.ci.meta.Constant; |
| |
| /** |
| * Represents an encoded representation of a constant. |
| */ |
| public final class EncodedSymbolConstant extends DataPointerConstant { |
| private final Constant constant; |
| private byte[] bytes; |
| |
| public EncodedSymbolConstant(Constant constant) { |
| super(1); |
| this.constant = constant; |
| } |
| |
| @Override |
| public int getSerializedSize() { |
| return getEncodedConstant().length; |
| } |
| |
| @Override |
| public void serialize(ByteBuffer buffer) { |
| buffer.put(getEncodedConstant()); |
| } |
| |
| /** |
| * Converts a string to a byte array with modified UTF-8 encoding. The first two bytes of the |
| * byte array store the length of the string in bytes. |
| * |
| * @param s a java.lang.String in UTF-16 |
| */ |
| private static byte[] toUTF8String(String s) { |
| try (ByteArrayOutputStream bytes = new ByteArrayOutputStream()) { |
| DataOutputStream stream = new DataOutputStream(bytes); |
| stream.writeUTF(s); |
| return bytes.toByteArray(); |
| } catch (Exception e) { |
| throw new PermanentBailoutException(e, "String conversion failed: %s", s); |
| } |
| } |
| |
| private static byte[] encodeConstant(Constant constant) { |
| assert constant != null; |
| if (constant instanceof HotSpotObjectConstant) { |
| return toUTF8String(((HotSpotObjectConstant) constant).asObject(String.class)); |
| } else if (constant instanceof HotSpotMetaspaceConstant) { |
| HotSpotMetaspaceConstant metaspaceConstant = ((HotSpotMetaspaceConstant) constant); |
| HotSpotResolvedObjectType klass = metaspaceConstant.asResolvedJavaType(); |
| if (klass != null) { |
| return toUTF8String(klass.getName()); |
| } |
| HotSpotResolvedJavaMethod method = metaspaceConstant.asResolvedJavaMethod(); |
| if (method != null) { |
| byte[] methodName = toUTF8String(method.getName()); |
| byte[] signature = toUTF8String(method.getSignature().toMethodDescriptor()); |
| byte[] result = new byte[methodName.length + signature.length]; |
| int resultPos = 0; |
| System.arraycopy(methodName, 0, result, resultPos, methodName.length); |
| resultPos += methodName.length; |
| System.arraycopy(signature, 0, result, resultPos, signature.length); |
| resultPos += signature.length; |
| assert resultPos == result.length; |
| return result; |
| } |
| |
| } |
| throw new PermanentBailoutException("Encoding of constant %s failed", constant); |
| } |
| |
| public byte[] getEncodedConstant() { |
| if (bytes == null) { |
| bytes = encodeConstant(constant); |
| } |
| return bytes; |
| } |
| |
| @Override |
| public String toValueString() { |
| return "encoded symbol\"" + constant.toValueString() + "\""; |
| } |
| |
| } |