43972
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/*
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* Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
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43972
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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43972
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package org.graalvm.compiler.java;
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public class JsrScope {
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public static final JsrScope EMPTY_SCOPE = new JsrScope();
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private final long scope;
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private JsrScope(long scope) {
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this.scope = scope;
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}
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public JsrScope() {
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this.scope = 0;
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}
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public int nextReturnAddress() {
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return (int) (scope & 0xffff);
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}
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public JsrScope push(int jsrReturnBci) {
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if ((scope & 0xffff000000000000L) != 0) {
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throw new JsrNotSupportedBailout("only four jsr nesting levels are supported");
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}
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return new JsrScope((scope << 16) | jsrReturnBci);
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}
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public boolean isEmpty() {
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return scope == 0;
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}
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public boolean isPrefixOf(JsrScope other) {
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return (scope & other.scope) == scope;
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}
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public JsrScope pop() {
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return new JsrScope(scope >>> 16);
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}
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@Override
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public int hashCode() {
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return (int) (scope ^ (scope >>> 32));
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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return obj != null && getClass() == obj.getClass() && scope == ((JsrScope) obj).scope;
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder();
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long tmp = scope;
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sb.append(" [");
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while (tmp != 0) {
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sb.append(", ").append(tmp & 0xffff);
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tmp = tmp >>> 16;
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}
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sb.append(']');
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return sb.toString();
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}
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}
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