Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/LocalVariableTable.java @ 23985:05922ce51c5e
Restore extra level of weakness in the ResolvedJavaType cache
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 23 Jan 2017 15:50:05 -0800 |
parents | 9bc5db6cdbb0 |
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 jdk.vm.ci.meta; import java.util.ArrayList; import java.util.List; /** * Describes the {@link Local}s for a Java method. * * @see "https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.13" */ public class LocalVariableTable { private final Local[] locals; /** * Creates an object describing the {@link Local}s for a Java method. * * @param locals array of objects describing local variables. This array is now owned by this * object and must not be mutated by the caller. */ @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `locals`") public LocalVariableTable(Local[] locals) { this.locals = locals; } /** * Gets a description of a local variable that occupies the bytecode frame slot indexed by * {@code slot} and is live at the bytecode index {@code bci}. * * @return a description of the requested local variable or null if no such variable matches * {@code slot} and {@code bci} */ public Local getLocal(int slot, int bci) { Local result = null; for (Local local : locals) { if (local.getSlot() == slot && local.getStartBCI() <= bci && local.getEndBCI() >= bci) { if (result == null) { result = local; } else { throw new IllegalStateException("Locals overlap!"); } } } return result; } /** * Gets a copy of the array of {@link Local}s that was passed to this object's constructor. */ public Local[] getLocals() { return locals.clone(); } /** * Gets a description of all the local variables live at the bytecode index {@code bci}. */ public Local[] getLocalsAt(int bci) { List<Local> result = new ArrayList<>(); for (Local l : locals) { if (l.getStartBCI() <= bci && bci <= l.getEndBCI()) { result.add(l); } } return result.toArray(new Local[result.size()]); } }