Mercurial > hg > truffle
view graal/Compiler/src/com/sun/c1x/ir/AccessField.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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/* * 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 java.lang.reflect.*; import com.sun.c1x.*; import com.sun.c1x.value.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; /** * The base class of all instructions that access fields. * * @author Ben L. Titzer */ public abstract class AccessField extends StateSplit { private Value object; protected final RiField field; /** * Constructs a new access field object. * @param kind the result kind of the access * @param object the instruction producing the receiver object * @param field the compiler interface representation of the 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 AccessField(CiKind kind, Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) { super(kind, stateBefore); this.object = object; this.field = field; if (!isLoaded || (C1XOptions.TestPatching && !Modifier.isVolatile(field.accessFlags()))) { // require patching if the field is not loaded (i.e. resolved), // or if patch testing is turned on (but not if the field is volatile) setFlag(Flag.NeedsPatching); } initFlag(Flag.IsLoaded, isLoaded); initFlag(Flag.IsStatic, isStatic); if (isLoaded && object.isNonNull()) { eliminateNullCheck(); } assert object != null : "every field access must reference some object"; } /** * Gets the instruction that produces the receiver object of this field access * (for instance field accesses). * @return the instruction that produces the receiver object */ public Value object() { return object; } /** * Gets the compiler interface field for this field access. * @return the compiler interface field for this field access */ public RiField field() { return field; } /** * Checks whether this field access is an access to a static field. * @return {@code true} if this field access is to a static field */ public boolean isStatic() { return checkFlag(Flag.IsStatic); } /** * Checks whether the class of the field of this access is loaded. * @return {@code true} if the class is loaded */ public boolean isLoaded() { return checkFlag(Flag.IsLoaded); } /** * Checks whether this field is declared volatile. * @return {@code true} if the field is resolved and declared volatile */ public boolean isVolatile() { return isLoaded() && Modifier.isVolatile(field.accessFlags()); } @Override public void runtimeCheckCleared() { if (isLoaded()) { clearState(); } } /** * Checks whether this field access will require patching. * @return {@code true} if this field access will require patching */ public boolean needsPatching() { return checkFlag(Flag.NeedsPatching); } /** * Checks whether this field access may cause a trap or an exception, which * is if it either requires a null check or needs patching. * @return {@code true} if this field access can cause a trap */ @Override public boolean canTrap() { return needsPatching() || needsNullCheck(); } @Override public void inputValuesDo(ValueClosure closure) { object = closure.apply(object); } }