Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/ir/LoadField.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/ir/LoadField.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,106 @@ +/* + * 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.sun.c1x.ir; + +import com.sun.c1x.*; +import com.sun.c1x.debug.*; +import com.sun.c1x.value.*; +import com.sun.cri.ci.*; +import com.sun.cri.ri.*; + +/** + * The {@code LoadField} instruction represents a read of a static or instance field. + * + * @author Ben L. Titzer + */ +public final class LoadField extends AccessField { + + /** + * 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 stateBefore the state before the field access + * @param isLoaded indicates if the class is loaded + */ + public LoadField(Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) { + super(field.kind().stackKind(), object, field, isStatic, stateBefore, isLoaded); + } + + /** + * 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 declaredType = declaredType(); + return declaredType.isResolved() ? declaredType.exactType() : null; + } + + @Override + public void accept(ValueVisitor v) { + v.visitLoadField(this); + } + + /** + * Gets a constant value to which this load can be reduced. + * + * @return {@code null} if this load cannot be reduced to a constant + */ + public CiConstant constantValue() { + if (!C1XOptions.CanonicalizeConstantFields) { + return null; + } + if (isStatic()) { + return field.constantValue(null); + } else if (object().isConstant()) { + CiConstant cons = field.constantValue(object().asConstant()); + if (cons != null) { + return cons; + } + return cons; + } + return null; + } + + @Override + public void print(LogStream out) { + out.print(object()). + print("."). + print(field.name()). + print(" [field: "). + print(CiUtil.format("%h.%n:%t", field, false)). + print("]"); + } +}