| /* |
| * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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.CounterKey; |
| import org.graalvm.compiler.debug.DebugContext; |
| 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 CounterKey counterFoldedUncompressDuringAddressLowering = DebugContext.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(DebugContext debug, AMD64AddressNode addr) { |
| |
| boolean result = false; |
| |
| while (super.improve(debug, addr)) { |
| result = true; |
| } |
| |
| if (addr.getScale() == Scale.Times1) { |
| if (addr.getIndex() instanceof CompressionNode) { |
| if (improveUncompression(addr, (CompressionNode) addr.getIndex(), addr.getBase())) { |
| counterFoldedUncompressDuringAddressLowering.increment(debug); |
| return true; |
| } |
| } |
| |
| if (addr.getBase() instanceof CompressionNode) { |
| if (improveUncompression(addr, (CompressionNode) addr.getBase(), addr.getIndex())) { |
| counterFoldedUncompressDuringAddressLowering.increment(debug); |
| 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; |
| } |
| } |
| } |