package org.graalvm.compiler.hotspot.replacements;
import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfigBase.INJECTED_METAACCESS;
import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.getArrayBaseOffset;
import java.util.zip.CRC32;
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.spi.ForeignCallDescriptor;
import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
import org.graalvm.compiler.graph.Node.NodeIntrinsic;
import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
import org.graalvm.compiler.hotspot.nodes.ComputeObjectAddressNode;
import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode;
import org.graalvm.compiler.nodes.extended.ForeignCallNode;
import org.graalvm.compiler.word.Word;
import jdk.internal.vm.compiler.word.Pointer;
import jdk.internal.vm.compiler.word.WordBase;
import jdk.internal.vm.compiler.word.WordFactory;
import jdk.vm.ci.meta.JavaKind;
@ClassSubstitution(CRC32.class)
public class CRC32Substitutions {
@Fold
static long crcTableAddress(@InjectedParameter GraalHotSpotVMConfig config) {
return config.crcTableAddress;
}
@MethodSubstitution(optional = true)
static int update(int crc, int b) {
final Pointer crcTableRawAddress = WordFactory.pointer(GraalHotSpotVMConfigNode.crcTableAddress());
int c = ~crc;
int index = (b ^ c) & 0xFF;
int offset = index << 2;
int result = crcTableRawAddress.readInt(offset);
result = result ^ (c >>> 8);
return ~result;
}
@MethodSubstitution(optional = true)
static int updateBytes(int crc, byte[] buf, int off, int len) {
Word bufAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(buf, getArrayBaseOffset(INJECTED_METAACCESS, JavaKind.Byte) + off));
return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
}
@MethodSubstitution(optional = true)
static int updateBytes0(int crc, byte[] buf, int off, int len) {
Word bufAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(buf, getArrayBaseOffset(INJECTED_METAACCESS, JavaKind.Byte) + off));
return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
}
@MethodSubstitution(optional = true)
static int updateByteBuffer(int crc, long addr, int off, int len) {
WordBase bufAddr = WordFactory.unsigned(addr).add(off);
return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
}
@MethodSubstitution(optional = true)
static int updateByteBuffer0(int crc, long addr, int off, int len) {
WordBase bufAddr = WordFactory.unsigned(addr).add(off);
return updateBytesCRC32(UPDATE_BYTES_CRC32, crc, bufAddr, len);
}
public static final ForeignCallDescriptor UPDATE_BYTES_CRC32 = new ForeignCallDescriptor("updateBytesCRC32", int.class, int.class, WordBase.class, int.class);
@NodeIntrinsic(ForeignCallNode.class)
public static native int updateBytesCRC32(@ConstantNodeParameter ForeignCallDescriptor descriptor, int crc, WordBase buf, int length);
}