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view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/PrimitiveValueProfile.java @ 18769:144fba40c979
Truffle: typo in documentation of PrimitiveValueProfile.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Wed, 31 Dec 2014 17:35:10 +0000 |
parents | 53afdc71b311 |
children | bc3cd000d9c8 |
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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 primitive equality or object identity of * values. * <p> * Note that for {@code float} and {@code double} values we compare primitive equality via * {@link Float#floatToRawIntBits} and {@link Double#doubleToRawLongBits}, so that for example * {@code -0.0} is not considered the same as {@code 0.0}, even though primitive equality would * normally say that it was. */ public class PrimitiveValueProfile extends ValueProfile { private static final Object UNINITIALIZED = new Object(); private static final Object GENERIC = new Object(); @CompilationFinal private Object cachedValue = UNINITIALIZED; PrimitiveValueProfile() { } @SuppressWarnings("unchecked") @Override public Object profile(Object value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Byte && value instanceof Byte && (byte) cachedValue == (byte) value) { return cachedValue; } else if (cachedValue instanceof Short && value instanceof Short && (short) cachedValue == (short) value) { return cachedValue; } else if (cachedValue instanceof Integer && value instanceof Integer && (int) cachedValue == (int) value) { return cachedValue; } else if (cachedValue instanceof Long && value instanceof Long && (long) cachedValue == (long) value) { return cachedValue; } else if (cachedValue instanceof Float && value instanceof Float && exactCompare((float) cachedValue, (float) value)) { return cachedValue; } else if (cachedValue instanceof Double && value instanceof Double && exactCompare((double) cachedValue, (double) value)) { return cachedValue; } else if (cachedValue instanceof Boolean && value instanceof Boolean && (boolean) cachedValue == (boolean) value) { return cachedValue; } else if (cachedValue instanceof Character && value instanceof Character && (char) cachedValue == (char) value) { return cachedValue; } else if (cachedValue == value) { return cachedValue; } else { cacheMiss(value); } } return value; } public byte profile(byte value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Byte && (byte) cachedValue == value) { return (byte) cachedValue; } else { cacheMiss(value); } } return value; } public short profile(short value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Short && (short) cachedValue == value) { return (short) cachedValue; } else { cacheMiss(value); } } return value; } public int profile(int value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Integer && (int) cachedValue == value) { return (int) cachedValue; } else { cacheMiss(value); } } return value; } public long profile(long value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Long && (long) cachedValue == value) { return (long) cachedValue; } else { cacheMiss(value); } } return value; } public float profile(float value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Float && exactCompare((float) cachedValue, value)) { return (float) cachedValue; } else { cacheMiss(value); } } return value; } public double profile(double value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Double && exactCompare((double) cachedValue, value)) { return (double) cachedValue; } else { cacheMiss(value); } } return value; } public boolean profile(boolean value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Boolean && (boolean) cachedValue == value) { return (boolean) cachedValue; } else { cacheMiss(value); } } return value; } public char profile(char value) { if (cachedValue != GENERIC) { if (cachedValue instanceof Character && (char) cachedValue == value) { return (char) cachedValue; } else { cacheMiss(value); } } 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(), formatValue(), hashCode()); } private void cacheMiss(Object value) { CompilerDirectives.transferToInterpreterAndInvalidate(); if (cachedValue == UNINITIALIZED) { cachedValue = value; } else { cachedValue = GENERIC; } } public static boolean exactCompare(float a, float b) { /* * -0.0 == 0.0, but you can tell the difference through other means, so we need to * differentiate. */ return Float.floatToRawIntBits(a) == Float.floatToRawIntBits(b); } public static boolean exactCompare(double a, double b) { /* * -0.0 == 0.0, but you can tell the difference through other means, so we need to * differentiate. */ return Double.doubleToRawLongBits(a) == Double.doubleToRawLongBits(b); } private String formatValue() { if (cachedValue == null) { return "null"; } else if (cachedValue == UNINITIALIZED) { return "uninitialized"; } else if (cachedValue == GENERIC) { return "generic"; } else if (cachedValue instanceof Byte || cachedValue instanceof Short || cachedValue instanceof Integer || cachedValue instanceof Long || cachedValue instanceof Float || cachedValue instanceof Double || cachedValue instanceof Boolean || cachedValue instanceof Character) { return String.format("%s=%s", cachedValue.getClass().getSimpleName(), cachedValue); } else { return String.format("%s@%x", cachedValue.getClass().getSimpleName(), Objects.hash(cachedValue)); } } }