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;
@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);
}
static final MetaAccessProvider INJECTED = null;
@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) {
return fromIndex;
}
int totalOffset = sourceOffset + fromIndex;
if (sourceCount - fromIndex < targetCount) {
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;
}
}
@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) {
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);
}
}