Mercurial > hg > graal-compiler
view graal/com.oracle.graal.java/src/com/oracle/graal/java/JsrScope.java @ 18862:be2351580c7d
Do not use an iterator when computing the single value of a PhiNode.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 14 Jan 2015 02:45:49 +0100 |
parents | e808627bd16f |
children |
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/* * Copyright (c) 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.oracle.graal.java; public class JsrScope { public static final JsrScope EMPTY_SCOPE = new JsrScope(); private final long scope; private JsrScope(long scope) { this.scope = scope; } public JsrScope() { this.scope = 0; } public int nextReturnAddress() { return (int) (scope & 0xffff); } public JsrScope push(int jsrReturnBci) { if ((scope & 0xffff000000000000L) != 0) { throw new JsrNotSupportedBailout("only four jsr nesting levels are supported"); } return new JsrScope((scope << 16) | jsrReturnBci); } public boolean isEmpty() { return scope == 0; } public boolean isPrefixOf(JsrScope other) { return (scope & other.scope) == scope; } public JsrScope pop() { return new JsrScope(scope >>> 16); } @Override public int hashCode() { return (int) (scope ^ (scope >>> 32)); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } return obj != null && getClass() == obj.getClass() && scope == ((JsrScope) obj).scope; } @Override public String toString() { StringBuilder sb = new StringBuilder(); long tmp = scope; sb.append(" ["); while (tmp != 0) { sb.append(", ").append(tmp & 0xffff); tmp = tmp >>> 16; } sb.append(']'); return sb.toString(); } }