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* 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).
*
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* 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.amd64;
import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC;
import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
import org.graalvm.compiler.asm.amd64.AMD64Address.Scale;
import org.graalvm.compiler.core.amd64.AMD64AddressLowering;
import org.graalvm.compiler.core.amd64.AMD64AddressNode;
import org.graalvm.compiler.core.common.CompressEncoding;
import org.graalvm.compiler.core.common.LIRKind;
import org.graalvm.compiler.core.common.NumUtil;
import org.graalvm.compiler.core.common.type.ObjectStamp;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.debug.Debug;
import org.graalvm.compiler.debug.DebugCounter;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode;
import org.graalvm.compiler.hotspot.nodes.type.KlassPointerStamp;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.CompressionNode;
import org.graalvm.compiler.nodes.CompressionNode.CompressionOp;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.FloatingNode;
import org.graalvm.compiler.nodes.spi.LIRLowerable;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
import org.graalvm.compiler.options.OptionValues;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.JavaKind;
public class AMD64HotSpotAddressLowering extends AMD64AddressLowering {
private static final DebugCounter counterFoldedUncompressDuringAddressLowering = Debug.counter("FoldedUncompressDuringAddressLowering");
private final long heapBase;
private final Register heapBaseRegister;
private final GraalHotSpotVMConfig config;
private final boolean generatePIC;
@NodeInfo(cycles = CYCLES_0, size = SIZE_0)
public static class HeapBaseNode extends FloatingNode implements LIRLowerable {
public static final NodeClass<HeapBaseNode> TYPE = NodeClass.create(HeapBaseNode.class);
private final Register heapBaseRegister;
public HeapBaseNode(Register heapBaseRegister) {
super(TYPE, StampFactory.pointer());
this.heapBaseRegister = heapBaseRegister;
}
@Override
public void generate(NodeLIRBuilderTool generator) {
LIRKind kind = generator.getLIRGeneratorTool().getLIRKind(stamp());
generator.setResult(this, heapBaseRegister.asValue(kind));
}
}
public AMD64HotSpotAddressLowering(GraalHotSpotVMConfig config, Register heapBaseRegister, OptionValues options) {
this.heapBase = config.getOopEncoding().getBase();
this.config = config;
this.generatePIC = GeneratePIC.getValue(options);
if (heapBase == 0 && !generatePIC) {
this.heapBaseRegister = null;
} else {
this.heapBaseRegister = heapBaseRegister;
}
}
@Override
protected boolean improve(AMD64AddressNode addr) {
boolean result = false;
while (super.improve(addr)) {
result = true;
}
if (addr.getScale() == Scale.Times1) {
if (addr.getIndex() instanceof CompressionNode) {
if (improveUncompression(addr, (CompressionNode) addr.getIndex(), addr.getBase())) {
counterFoldedUncompressDuringAddressLowering.increment();
return true;
}
}
if (addr.getBase() instanceof CompressionNode) {
if (improveUncompression(addr, (CompressionNode) addr.getBase(), addr.getIndex())) {
counterFoldedUncompressDuringAddressLowering.increment();
return true;
}
}
}
return result;
}
private boolean improveUncompression(AMD64AddressNode addr, CompressionNode compression, ValueNode other) {
if (compression.getOp() == CompressionOp.Uncompress) {
CompressEncoding encoding = compression.getEncoding();
Scale scale = Scale.fromShift(encoding.getShift());
if (scale == null) {
return false;
}
if (heapBaseRegister != null && encoding.getBase() == heapBase) {
if ((!generatePIC || compression.stamp() instanceof ObjectStamp) && other == null) {
// With PIC it is only legal to do for oops since the base value may be
// different at runtime.
ValueNode base = compression.graph().unique(new HeapBaseNode(heapBaseRegister));
addr.setBase(base);
} else {
return false;
}
} else if (encoding.getBase() != 0 || (generatePIC && compression.stamp() instanceof KlassPointerStamp)) {
if (generatePIC) {
if (other == null) {
ValueNode base = compression.graph().unique(new GraalHotSpotVMConfigNode(config, config.MARKID_NARROW_KLASS_BASE_ADDRESS, JavaKind.Long));
addr.setBase(base);
} else {
return false;
}
} else {
long disp = addr.getDisplacement() + encoding.getBase();
if (NumUtil.isInt(disp)) {
addr.setDisplacement((int) disp);
addr.setBase(other);
} else {
return false;
}
}
} else {
addr.setBase(other);
}
addr.setScale(scale);
addr.setIndex(compression.getValue());
return true;
} else {
return false;
}
}
}