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* version 2 for more details (a copy is included in the LICENSE file that
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package org.graalvm.compiler.hotspot.nodes.type;
import org.graalvm.compiler.core.common.CompressEncoding;
import org.graalvm.compiler.core.common.type.AbstractObjectStamp;
import org.graalvm.compiler.core.common.type.ObjectStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.debug.GraalError;
import org.graalvm.compiler.nodes.CompressionNode.CompressionOp;
import org.graalvm.compiler.nodes.type.NarrowOopStamp;
import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant;
import jdk.vm.ci.hotspot.HotSpotMemoryAccessProvider;
import jdk.vm.ci.hotspot.HotSpotObjectConstant;
import jdk.vm.ci.meta.Constant;
import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.MemoryAccessProvider;
import jdk.vm.ci.meta.ResolvedJavaType;
public final class HotSpotNarrowOopStamp extends NarrowOopStamp {
private HotSpotNarrowOopStamp(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull, CompressEncoding encoding) {
super(type, exactType, nonNull, alwaysNull, encoding);
}
@Override
protected AbstractObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull) {
return new HotSpotNarrowOopStamp(type, exactType, nonNull, alwaysNull, getEncoding());
}
public static Stamp compressed(AbstractObjectStamp stamp, CompressEncoding encoding) {
return new HotSpotNarrowOopStamp(stamp.type(), stamp.isExactType(), stamp.nonNull(), stamp.alwaysNull(), encoding);
}
@Override
public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {
try {
HotSpotMemoryAccessProvider hsProvider = (HotSpotMemoryAccessProvider) provider;
return hsProvider.readNarrowOopConstant(base, displacement);
} catch (IllegalArgumentException e) {
return null;
}
}
@Override
public JavaConstant asConstant() {
if (alwaysNull()) {
return HotSpotCompressedNullConstant.COMPRESSED_NULL;
} else {
return null;
}
}
@Override
public boolean isCompatible(Constant other) {
if (other instanceof HotSpotObjectConstant) {
return ((HotSpotObjectConstant) other).isCompressed();
}
return true;
}
public static Stamp mkStamp(CompressionOp op, Stamp input, CompressEncoding encoding) {
switch (op) {
case Compress:
if (input instanceof ObjectStamp) {
// compressed oop
return HotSpotNarrowOopStamp.compressed((ObjectStamp) input, encoding);
} else if (input instanceof KlassPointerStamp) {
// compressed klass pointer
return ((KlassPointerStamp) input).compressed(encoding);
}
break;
case Uncompress:
if (input instanceof NarrowOopStamp) {
// oop
assert encoding.equals(((NarrowOopStamp) input).getEncoding());
return ((NarrowOopStamp) input).uncompressed();
} else if (input instanceof KlassPointerStamp) {
// metaspace pointer
assert encoding.equals(((KlassPointerStamp) input).getEncoding());
return ((KlassPointerStamp) input).uncompressed();
}
break;
}
throw GraalError.shouldNotReachHere(String.format("Unexpected input stamp %s", input));
}
}