Mercurial > hg > truffle
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/ir/AccessField.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,138 @@ +/* + * 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); + } +}