Mercurial > hg > truffle
view graal/com.oracle.graal.graph/src/com/oracle/graal/graph/NodeIdAccessor.java @ 19507:1cde96b96673
Fixed code format issues.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 19 Feb 2015 16:15:56 +0100 |
parents | 43301f080126 |
children |
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/* * Copyright (c) 2013, 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.graal.graph; /** * An entity that depends upon {@linkplain Graph#maybeCompress() stable} node identifiers. */ class NodeIdAccessor { final Graph graph; final int epoch; public NodeIdAccessor(Graph graph) { this.graph = graph; this.epoch = graph.compressions; } Graph getGraph() { return graph; } /** * Verifies that node identifiers have not changed since this object was created. * * @return true if the check succeeds * @throws VerificationError if the check fails */ public boolean verifyIdsAreStable() { int compressions = graph.compressions - epoch; if (compressions != 0) { throw new VerificationError("accessing node id in %s across %d graph compression%s", graph, compressions, compressions == 1 ? "" : "s"); } return true; } /** * Gets the identifier for a node. If assertions are enabled, this method asserts that the * identifier is stable. */ public int getNodeId(Node node) { assert verifyIdsAreStable(); return node.id(); } }