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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.replacements.amd64;

import org.graalvm.compiler.api.replacements.ClassSubstitution;
import org.graalvm.compiler.api.replacements.Fold;
import org.graalvm.compiler.api.replacements.Fold.InjectedParameter;
import org.graalvm.compiler.api.replacements.MethodSubstitution;
import org.graalvm.compiler.core.common.SuppressFBWarnings;
import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
import org.graalvm.compiler.replacements.StringSubstitutions;
import org.graalvm.compiler.replacements.nodes.ArrayCompareToNode;
import org.graalvm.compiler.replacements.nodes.ArrayRegionEqualsNode;
import org.graalvm.compiler.word.Word;
import jdk.internal.vm.compiler.word.Pointer;

import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.MetaAccessProvider;

// JaCoCo Exclude

Substitutions for String methods.
/** * Substitutions for {@link java.lang.String} methods. */
@ClassSubstitution(String.class) public class AMD64StringSubstitutions { @Fold static int charArrayBaseOffset(@InjectedParameter MetaAccessProvider metaAccess) { return metaAccess.getArrayBaseOffset(JavaKind.Char); } @Fold static int charArrayIndexScale(@InjectedParameter MetaAccessProvider metaAccess) { return metaAccess.getArrayIndexScale(JavaKind.Char); }
Marker value for the InjectedParameter injected parameter.
/** Marker value for the {@link InjectedParameter} injected parameter. */
static final MetaAccessProvider INJECTED = null; // Only exists in JDK <= 8 @MethodSubstitution(isStatic = true, optional = true) public static int indexOf(char[] source, int sourceOffset, int sourceCount, @ConstantNodeParameter char[] target, int targetOffset, int targetCount, int origFromIndex) { int fromIndex = origFromIndex; if (fromIndex >= sourceCount) { return (targetCount == 0 ? sourceCount : -1); } if (fromIndex < 0) { fromIndex = 0; } if (targetCount == 0) { // The empty string is in every string. return fromIndex; } int totalOffset = sourceOffset + fromIndex; if (sourceCount - fromIndex < targetCount) { // The empty string contains nothing except the empty string. return -1; } assert sourceCount - fromIndex > 0 && targetCount > 0; if (targetCount == 1) { Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); int indexOfResult = AMD64ArrayIndexOf.indexOf1Char(sourcePointer, sourceCount - fromIndex, target[targetOffset]); if (indexOfResult >= 0) { return indexOfResult + totalOffset; } return indexOfResult; } else if (targetCount == 2) { Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); int indexOfResult = AMD64ArrayIndexOf.indexOfTwoConsecutiveChars(sourcePointer, sourceCount - fromIndex, target[targetOffset], target[targetOffset + 1]); if (indexOfResult >= 0) { return indexOfResult + totalOffset; } return indexOfResult; } else { int haystackLength = sourceCount - (fromIndex + (targetCount - 2)); while (haystackLength > 0) { Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); int indexOfResult = AMD64ArrayIndexOf.indexOfTwoConsecutiveChars(sourcePointer, haystackLength, target[targetOffset], target[targetOffset + 1]); if (indexOfResult < 0) { return -1; } totalOffset += indexOfResult; haystackLength -= (indexOfResult + 1); Pointer cmpSourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); Pointer targetPointer = Word.objectToTrackedPointer(target).add(charArrayBaseOffset(INJECTED)).add(targetOffset * charArrayIndexScale(INJECTED)); if (ArrayRegionEqualsNode.regionEquals(cmpSourcePointer, targetPointer, targetCount, JavaKind.Char)) { return totalOffset; } totalOffset++; } return -1; } } // Only exists in JDK <= 8 @MethodSubstitution(isStatic = false, optional = true) public static int indexOf(String source, int ch, int origFromIndex) { int fromIndex = origFromIndex; final int sourceCount = source.length(); if (fromIndex >= sourceCount) { // Note: fromIndex might be near -1>>>1. return -1; } if (fromIndex < 0) { fromIndex = 0; } if (ch < Character.MIN_SUPPLEMENTARY_CODE_POINT) { char[] sourceArray = StringSubstitutions.getValue(source); Pointer sourcePointer = Word.objectToTrackedPointer(sourceArray).add(charArrayBaseOffset(INJECTED)).add(fromIndex * charArrayIndexScale(INJECTED)); int result = AMD64ArrayIndexOf.indexOf1Char(sourcePointer, sourceCount - fromIndex, (char) ch); if (result != -1) { return result + fromIndex; } return result; } else { return indexOf(source, ch, origFromIndex); } } @MethodSubstitution(isStatic = false) @SuppressFBWarnings(value = "ES_COMPARING_PARAMETER_STRING_WITH_EQ", justification = "reference equality on the receiver is what we want") public static int compareTo(String receiver, String anotherString) { if (receiver == anotherString) { return 0; } char[] value = StringSubstitutions.getValue(receiver); char[] other = StringSubstitutions.getValue(anotherString); return ArrayCompareToNode.compareTo(value, other, value.length << 1, other.length << 1, JavaKind.Char, JavaKind.Char); } }