Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/CompressionNode.java @ 15522:589c3627fab8
special cases for addresses involving compressed references
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 05 May 2014 20:33:00 -0700 |
parents | 319deee16746 |
children | fd47de8808fc |
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/* * Copyright (c) 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.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.HotSpotVMConfig.CompressEncoding; import com.oracle.graal.hotspot.nodes.type.*; 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 FloatingNode implements LIRLowerable, Canonicalizable { private enum CompressionOp { Compress, Uncompress } private final CompressionOp op; private final CompressEncoding encoding; @Input private ValueNode input; private CompressionNode(CompressionOp op, ValueNode input, CompressEncoding encoding) { super(mkStamp(op, input.stamp(), encoding)); this.op = op; this.encoding = encoding; this.input = input; } 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 Stamp mkStamp(CompressionOp op, Stamp input, CompressEncoding encoding) { switch (op) { case Compress: if (input instanceof ObjectStamp) { // compressed oop return new NarrowOopStamp((ObjectStamp) input, encoding); } else if (input instanceof IntegerStamp) { // compressed metaspace pointer assert PrimitiveStamp.getBits(input) == 64; return StampFactory.forInteger(32); } break; case Uncompress: if (input instanceof NarrowOopStamp) { // oop assert encoding.equals(((NarrowOopStamp) input).getEncoding()); return ((NarrowOopStamp) input).uncompressed(); } else if (input instanceof IntegerStamp) { // metaspace pointer assert PrimitiveStamp.getBits(input) == 32; return StampFactory.forInteger(64); } break; } throw GraalInternalError.shouldNotReachHere(); } public ValueNode getInput() { return input; } public CompressEncoding getEncoding() { return encoding; } @Override public Node canonical(CanonicalizerTool tool) { if (input instanceof CompressionNode) { CompressionNode other = (CompressionNode) input; if (op != other.op && encoding.equals(other.encoding)) { return other.input; } } return this; } @Override public void generate(NodeLIRBuilderTool gen) { HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen.getLIRGeneratorTool(); boolean nonNull; if (input.stamp() instanceof ObjectStamp) { nonNull = StampTool.isObjectNonNull(input.stamp()); } else { // metaspace pointers are never null nonNull = true; } Value result; switch (op) { case Compress: result = hsGen.emitCompress(gen.operand(input), encoding, nonNull); break; case Uncompress: result = hsGen.emitUncompress(gen.operand(input), encoding, nonNull); break; default: throw GraalInternalError.shouldNotReachHere(); } gen.setResult(this, result); } }