Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/IdentityValueProfile.java @ 21646:645f170013a4
Fix in the scheduler for proxy node handling.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 01 Jun 2015 22:14:34 +0200 |
parents | 1e542561783e |
children |
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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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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.truffle.api.utilities; import java.util.*; import com.oracle.truffle.api.*; import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; /** * Represents a {@link ValueProfile} that speculates on the object identity of a value. */ public final class IdentityValueProfile extends ValueProfile { private static final Object UNINITIALIZED = new Object(); private static final Object GENERIC = new Object(); @CompilationFinal protected Object cachedValue = UNINITIALIZED; IdentityValueProfile() { } @Override @SuppressWarnings("unchecked") public <T> T profile(T value) { if (cachedValue != GENERIC) { if (cachedValue == value) { return (T) cachedValue; } else { CompilerDirectives.transferToInterpreterAndInvalidate(); if (cachedValue == UNINITIALIZED) { cachedValue = value; } else { cachedValue = GENERIC; } } } return value; } public boolean isGeneric() { return getCachedValue() == GENERIC; } public boolean isUninitialized() { return getCachedValue() == UNINITIALIZED; } public Object getCachedValue() { return cachedValue; } @Override public String toString() { return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : String.format("@%x", Objects.hash(cachedValue))), hashCode()); } }