Mercurial > hg > truffle
view graal/com.oracle.jvmci.debug/src/com/oracle/jvmci/debug/Fingerprint.java @ 21654:cd6b1b2189a0
Remove GuardingPiNode and replace with FixedGuardNode + PiNode.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 02 Jun 2015 11:45:43 +0200 |
parents | d563baeca9df |
children |
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/* * Copyright (c) 2015, 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.oracle.jvmci.debug; import java.util.*; import java.util.stream.*; /** * Facility for fingerprinting execution. */ public class Fingerprint implements AutoCloseable { public static final String ENABLED_PROPERTY_NAME = "jvmci.fingerprint"; /** * Determines whether fingerprinting is enabled. This is set by the * {@value #ENABLED_PROPERTY_NAME} system property when this class is initialized. */ public static final boolean ENABLED = Boolean.getBoolean(ENABLED_PROPERTY_NAME); private static final ThreadLocal<Fingerprint> current = ENABLED ? new ThreadLocal<>() : null; private final List<String> events; private int index; /** * Creates an object to record a fingerprint. */ public Fingerprint() { events = new ArrayList<>(); index = -1; } /** * Creates an object to verify execution matches a given fingerprint. * * @param toVerifyAgainst the fingerprint events to verify against */ public Fingerprint(List<String> toVerifyAgainst) { this.events = toVerifyAgainst; index = 0; } /** * Creates an object to verify execution matches a given fingerprint. * * @param toVerifyAgainst the fingerprint to verify against */ public Fingerprint(Fingerprint toVerifyAgainst) { this(toVerifyAgainst.events); } public Collection<String> getEvents() { return Collections.unmodifiableCollection(events); } /** * Starts fingerprint recording or verification for the current thread. At most one fingerprint * object can be active for any thread. */ public Fingerprint open() { if (ENABLED) { assert current.get() == null; current.set(this); return this; } return null; } /** * Finishes fingerprint recording or verification for the current thread. */ public void close() { if (ENABLED) { assert current.get() == this; current.set(null); } } private static final int BREAKPOINT_EVENT = Integer.getInteger(ENABLED_PROPERTY_NAME + ".breakpointEvent", -1); /** * Submits an execution event for the purpose of recording or verifying a fingerprint. This must * only be called if {@link #ENABLED} is {@code true}. */ public static void submit(String format, Object... args) { assert ENABLED : "fingerprinting must be enabled (-D" + ENABLED_PROPERTY_NAME + "=true)"; Fingerprint fingerprint = current.get(); if (fingerprint != null) { int eventId = fingerprint.nextEventId(); if (eventId == BREAKPOINT_EVENT) { // Set IDE breakpoint on the following line and set the relevant // system property to debug a fingerprint verification error. System.console(); } fingerprint.event(String.format(eventId + ": " + format, args)); } } private int nextEventId() { return index == -1 ? events.size() : index; } private static final int MAX_EVENT_TAIL_IN_ERROR_MESSAGE = Integer.getInteger("jvmci.fingerprint.errorEventTailLength", 50); private String tail() { int start = Math.max(index - MAX_EVENT_TAIL_IN_ERROR_MESSAGE, 0); return events.subList(start, index).stream().collect(Collectors.joining(String.format("%n"))); } private void event(String entry) { if (index == -1) { events.add(entry); } else { if (index > events.size()) { throw new InternalError(String.format("%s%nOriginal fingerprint limit reached", tail())); } String l = events.get(index); if (!l.equals(entry)) { throw new InternalError(String.format("%s%nFingerprint differs at event %d%nexpected: %s%n actual: %s", tail(), index, l, entry)); } index++; } } }