Mercurial > hg > graal-compiler
view graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/LoadField.java @ 3010:ac6fb0c93ffb
Towards lowering (example lowering for field access).
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Thu, 16 Jun 2011 20:09:26 +0200 |
parents | 0c0e407faa39 |
children | 0ef7a8219b45 |
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/* * Copyright (c) 2009, 2011, 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.max.graal.compiler.ir; import com.oracle.max.graal.compiler.debug.*; import com.oracle.max.graal.compiler.graph.*; import com.oracle.max.graal.compiler.phases.CanonicalizerPhase.CanonicalizerOp; import com.oracle.max.graal.compiler.phases.LoweringPhase.LoweringOp; import com.oracle.max.graal.compiler.phases.LoweringPhase.LoweringTool; import com.oracle.max.graal.graph.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; /** * The {@code LoadField} instruction represents a read of a static or instance field. */ public final class LoadField extends AccessField { private static final LoadFieldCanonicalizerOp CANONICALIZER = new LoadFieldCanonicalizerOp(); private static final LoadFieldLoweringOp LOWERING = new LoadFieldLoweringOp(); private static final int INPUT_COUNT = 0; private static final int SUCCESSOR_COUNT = 0; /** * Creates a new LoadField instance. * @param object the receiver object * @param field the compiler interface field * @param isStatic indicates if the field is static * @param stateAfter the state after the field access * @param graph * @param isLoaded indicates if the class is loaded */ public LoadField(Value object, RiField field, Graph graph) { super(field.kind().stackKind(), object, field, INPUT_COUNT, SUCCESSOR_COUNT, graph); } /** * Gets the declared type of the field being accessed. * @return the declared type of the field being accessed. */ @Override public RiType declaredType() { return field().type(); } /** * Gets the exact type of the field being accessed. If the field type is * a primitive array or an instance class and the class is loaded and final, * then the exact type is the same as the declared type. Otherwise it is {@code null} * @return the exact type of the field if known; {@code null} otherwise */ @Override public RiType exactType() { RiType declared = declaredType(); return declared != null && declared.isResolved() ? declared.exactType() : null; } @Override public void accept(ValueVisitor v) { v.visitLoadField(this); } @Override public void print(LogStream out) { out.print(object()). print("."). print(field.name()). print(" [field: "). print(CiUtil.format("%h.%n:%t", field, false)). print("]"); } @Override public boolean needsStateAfter() { return false; } /** * Gets a constant value to which this load can be reduced. * * @return {@code null} if this load cannot be reduced to a constant */ private CiConstant constantValue() { if (isStatic()) { return field.constantValue(null); } else if (object().isConstant()) { return field.constantValue(object().asConstant()); } return null; } @Override public Node copy(Graph into) { return new LoadField(null, field, into); } @SuppressWarnings("unchecked") @Override public <T extends Op> T lookup(Class<T> clazz) { if (clazz == CanonicalizerOp.class) { return (T) CANONICALIZER; } else if (clazz == LoweringOp.class) { return (T) LOWERING; } return super.lookup(clazz); } private static class LoadFieldLoweringOp implements LoweringOp { @Override public Node lower(Node n, LoweringTool tool) { LoadField field = (LoadField) n; if (field.isVolatile()) { return null; } Graph graph = field.graph(); int displacement = field.field().offset(); assert field.kind != CiKind.Illegal; MemoryRead memoryRead = new MemoryRead(field.field().kind(), displacement, graph); memoryRead.setGuard(new IsNonNull(field.object(), graph)); memoryRead.setNext(field.next()); memoryRead.setLocation(field.object()); return memoryRead; } } private static class LoadFieldCanonicalizerOp implements CanonicalizerOp { @Override public Node canonical(Node node) { LoadField loadField = (LoadField) node; Graph graph = node.graph(); CiConstant constant = null; if (graph instanceof CompilerGraph) { RiMethod method = ((CompilerGraph) graph).getCompilation().method; if (loadField.isStatic() && !method.isClassInitializer()) { constant = loadField.field().constantValue(null); } } if (!loadField.isStatic()) { Value object = loadField.object(); if (object.isConstant()) { constant = loadField.field().constantValue(object.asConstant()); } } if (constant != null) { return new Constant(constant, graph); } return loadField; } } }