1 /* 2 * Copyright (c) 2012, 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 static org.graalvm.compiler.hotspot.replacements.UnsafeAccess.UNSAFE; 26 import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; 27 28 import org.graalvm.compiler.api.replacements.Fold; 29 import org.graalvm.compiler.api.replacements.Snippet; 30 import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; 31 import org.graalvm.compiler.core.common.LocationIdentity; 32 import org.graalvm.compiler.hotspot.meta.HotSpotProviders; 33 import org.graalvm.compiler.nodes.NamedLocationIdentity; 34 import org.graalvm.compiler.nodes.debug.StringToBytesNode; 35 import org.graalvm.compiler.nodes.java.NewArrayNode; 36 import org.graalvm.compiler.nodes.spi.LoweringTool; 37 import org.graalvm.compiler.replacements.SnippetTemplate; 38 import org.graalvm.compiler.replacements.SnippetTemplate.AbstractTemplates; 39 import org.graalvm.compiler.replacements.SnippetTemplate.Arguments; 40 import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo; 41 import org.graalvm.compiler.replacements.Snippets; 42 import org.graalvm.compiler.replacements.nodes.CStringConstant; 43 import org.graalvm.compiler.word.Word; 44 45 import jdk.vm.ci.code.TargetDescription; 46 import jdk.vm.ci.meta.JavaKind; 47 48 /** 49 * The {@code StringToBytesSnippets} contains a snippet for lowering {@link StringToBytesNode}. 50 */ 51 public class StringToBytesSnippets implements Snippets { 52 53 public static final LocationIdentity CSTRING_LOCATION = NamedLocationIdentity.immutable("CString location"); 54 55 @Fold 56 static long arrayBaseOffset() { 57 return UNSAFE.arrayBaseOffset(char[].class); 58 } 59 60 @Snippet 61 public static byte[] transform(@ConstantParameter String compilationTimeString) { 62 int i = compilationTimeString.length(); 63 byte[] array = (byte[]) NewArrayNode.newUninitializedArray(byte.class, i); 64 Word cArray = CStringConstant.cstring(compilationTimeString); 65 while (i-- > 0) { 66 // array[i] = cArray.readByte(i); 67 UNSAFE.putByte(array, arrayBaseOffset() + i, cArray.readByte(i, CSTRING_LOCATION)); 68 } 69 return array; 70 } 71 72 public static class Templates extends AbstractTemplates { 73 74 private final SnippetInfo create; 75 76 public Templates(HotSpotProviders providers, TargetDescription target) { 77 super(providers, providers.getSnippetReflection(), target); 78 create = snippet(StringToBytesSnippets.class, "transform", NamedLocationIdentity.getArrayLocation(JavaKind.Byte)); 79 } 80 81 public void lower(StringToBytesNode stringToBytesNode, LoweringTool tool) { 82 Arguments args = new Arguments(create, stringToBytesNode.graph().getGuardsStage(), tool.getLoweringStage()); 83 args.addConst("compilationTimeString", stringToBytesNode.getValue()); 84 SnippetTemplate template = template(args); 85 template.instantiate(providers.getMetaAccess(), stringToBytesNode, DEFAULT_REPLACER, args); 86 } 87 88 } 89 90 }