Mercurial > hg > graal-compiler
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/CompressionNode.java @ 18998:ec0733b5a90a
Allow final modifier on node subclasses and start adding the modifier to leaf classes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 28 Jan 2015 02:34:14 +0100 |
parents | f57d86eb036f |
children | 7e2c87dae93e |
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/* * Copyright (c) 2014, 2014, 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 com.oracle.graal.hotspot.nodes; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.HotSpotVMConfig.CompressEncoding; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.hotspot.nodes.type.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * Compress or uncompress an oop or metaspace pointer. */ @NodeInfo(nameTemplate = "{p#op/s}") public final class CompressionNode extends UnaryNode implements ConvertNode, LIRLowerable { public enum CompressionOp { Compress, Uncompress } protected final CompressionOp op; protected final CompressEncoding encoding; public CompressionNode(CompressionOp op, ValueNode input, CompressEncoding encoding) { super(mkStamp(op, input.stamp(), encoding), input); this.op = op; this.encoding = encoding; } @Override public boolean inferStamp() { return updateStamp(mkStamp(op, getValue().stamp(), encoding)); } public static CompressionNode compress(ValueNode input, CompressEncoding encoding) { return input.graph().unique(new CompressionNode(CompressionOp.Compress, input, encoding)); } public static CompressionNode uncompress(ValueNode input, CompressEncoding encoding) { return input.graph().unique(new CompressionNode(CompressionOp.Uncompress, input, encoding)); } private static Constant compress(Constant c, CompressEncoding encoding) { if (JavaConstant.NULL_POINTER.equals(c)) { return HotSpotCompressedNullConstant.COMPRESSED_NULL; } else if (c instanceof HotSpotObjectConstant) { return ((HotSpotObjectConstant) c).compress(); } else if (c instanceof HotSpotMetaspaceConstant) { return ((HotSpotMetaspaceConstant) c).compress(encoding); } else { throw GraalInternalError.shouldNotReachHere("invalid constant input for compress op: " + c); } } private static Constant uncompress(Constant c, CompressEncoding encoding) { if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) { return JavaConstant.NULL_POINTER; } else if (c instanceof HotSpotObjectConstant) { return ((HotSpotObjectConstant) c).uncompress(); } else if (c instanceof HotSpotMetaspaceConstant) { return ((HotSpotMetaspaceConstant) c).uncompress(encoding); } else { throw GraalInternalError.shouldNotReachHere("invalid constant input for uncompress op: " + c); } } @Override public Constant convert(Constant c, ConstantReflectionProvider constantReflection) { switch (op) { case Compress: return compress(c, encoding); case Uncompress: return uncompress(c, encoding); default: throw GraalInternalError.shouldNotReachHere(); } } @Override public Constant reverse(Constant c, ConstantReflectionProvider constantReflection) { switch (op) { case Compress: return uncompress(c, encoding); case Uncompress: return compress(c, encoding); default: throw GraalInternalError.shouldNotReachHere(); } } @Override public boolean isLossless() { return true; } private static Stamp mkStamp(CompressionOp op, Stamp input, CompressEncoding encoding) { switch (op) { case Compress: if (input instanceof ObjectStamp) { // compressed oop return NarrowOopStamp.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 GraalInternalError.shouldNotReachHere(String.format("Unexpected input stamp %s", input)); } public CompressEncoding getEncoding() { return encoding; } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { if (forValue.isConstant()) { return ConstantNode.forConstant(stamp(), convert(forValue.asConstant(), tool.getConstantReflection()), tool.getMetaAccess()); } else if (forValue instanceof CompressionNode) { CompressionNode other = (CompressionNode) forValue; if (op != other.op && encoding.equals(other.encoding)) { return other.getValue(); } } return this; } @Override public void generate(NodeLIRBuilderTool gen) { HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen.getLIRGeneratorTool(); boolean nonNull; if (getValue().stamp() instanceof AbstractObjectStamp) { nonNull = StampTool.isPointerNonNull(getValue().stamp()); } else { // metaspace pointers are never null nonNull = true; } Value result; switch (op) { case Compress: result = hsGen.emitCompress(gen.operand(getValue()), encoding, nonNull); break; case Uncompress: result = hsGen.emitUncompress(gen.operand(getValue()), encoding, nonNull); break; default: throw GraalInternalError.shouldNotReachHere(); } gen.setResult(this, result); } @NodeIntrinsic public static native Object compression(@ConstantNodeParameter CompressionOp op, Object object, @ConstantNodeParameter CompressEncoding encoding); }