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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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.
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package org.graalvm.compiler.hotspot.replacements;

import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_METAACCESS;
import static org.graalvm.compiler.replacements.ReplacementsUtil.getArrayBaseOffset;
import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER;

import org.graalvm.compiler.api.replacements.Snippet;
import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter;
import org.graalvm.compiler.debug.DebugHandlersFactory;
import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
import org.graalvm.compiler.nodes.NamedLocationIdentity;
import org.graalvm.compiler.nodes.debug.StringToBytesNode;
import org.graalvm.compiler.nodes.extended.RawStoreNode;
import org.graalvm.compiler.nodes.java.NewArrayNode;
import org.graalvm.compiler.nodes.spi.LoweringTool;
import org.graalvm.compiler.options.OptionValues;
import org.graalvm.compiler.replacements.SnippetTemplate;
import org.graalvm.compiler.replacements.SnippetTemplate.AbstractTemplates;
import org.graalvm.compiler.replacements.SnippetTemplate.Arguments;
import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo;
import org.graalvm.compiler.replacements.Snippets;
import org.graalvm.compiler.replacements.nodes.CStringConstant;
import org.graalvm.compiler.word.Word;
import jdk.internal.vm.compiler.word.LocationIdentity;

import jdk.vm.ci.code.TargetDescription;
import jdk.vm.ci.meta.JavaKind;

The StringToBytesSnippets contains a snippet for lowering StringToBytesNode.
/** * The {@code StringToBytesSnippets} contains a snippet for lowering {@link StringToBytesNode}. */
public class StringToBytesSnippets implements Snippets { public static final LocationIdentity CSTRING_LOCATION = NamedLocationIdentity.immutable("CString location"); @Snippet public static byte[] transform(@ConstantParameter String compilationTimeString) { int i = compilationTimeString.length(); byte[] array = (byte[]) NewArrayNode.newUninitializedArray(byte.class, i); Word cArray = CStringConstant.cstring(compilationTimeString); while (i-- > 0) { // array[i] = cArray.readByte(i); RawStoreNode.storeByte(array, getArrayBaseOffset(INJECTED_METAACCESS, JavaKind.Byte) + i, cArray.readByte(i, CSTRING_LOCATION), JavaKind.Byte, NamedLocationIdentity.getArrayLocation(JavaKind.Byte)); } return array; } public static class Templates extends AbstractTemplates { private final SnippetInfo create; public Templates(OptionValues options, Iterable<DebugHandlersFactory> factories, HotSpotProviders providers, TargetDescription target) { super(options, factories, providers, providers.getSnippetReflection(), target); create = snippet(StringToBytesSnippets.class, "transform", NamedLocationIdentity.getArrayLocation(JavaKind.Byte)); } public void lower(StringToBytesNode stringToBytesNode, LoweringTool tool) { Arguments args = new Arguments(create, stringToBytesNode.graph().getGuardsStage(), tool.getLoweringStage()); args.addConst("compilationTimeString", stringToBytesNode.getValue()); SnippetTemplate template = template(stringToBytesNode, args); template.instantiate(providers.getMetaAccess(), stringToBytesNode, DEFAULT_REPLACER, args); } } }