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/*
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* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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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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package jdk.vm.ci.meta;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Describes the {@link Local}s for a Java method.
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*
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* @see "https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.13"
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*/
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public class LocalVariableTable {
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private final Local[] locals;
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/**
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* Creates an object describing the {@link Local}s for a Java method.
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*
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* @param locals array of objects describing local variables. This array is now owned by this
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* object and must not be mutated by the caller.
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*/
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@SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `locals`")
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public LocalVariableTable(Local[] locals) {
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this.locals = locals;
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}
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/**
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* Gets a description of a local variable that occupies the bytecode frame slot indexed by
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* {@code slot} and is live at the bytecode index {@code bci}
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*
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* @return a description of the requested local variable or null if no such variable matches
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* {@code slot} and {@code bci}
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*/
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public Local getLocal(int slot, int bci) {
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Local result = null;
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for (Local local : locals) {
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if (local.getSlot() == slot && local.getStartBCI() <= bci && local.getEndBCI() >= bci) {
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if (result == null) {
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result = local;
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} else {
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throw new IllegalStateException("Locals overlap!");
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}
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}
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}
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return result;
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}
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/**
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* Gets a copy of the array of {@link Local}s that was passed to this object's constructor.
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*/
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public Local[] getLocals() {
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return locals.clone();
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}
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/**
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* Gets a description of all the local variables live at the bytecode index {@code bci}
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*/
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public Local[] getLocalsAt(int bci) {
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List<Local> result = new ArrayList<>();
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for (Local l : locals) {
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if (l.getStartBCI() <= bci && bci <= l.getEndBCI()) {
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result.add(l);
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}
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}
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return result.toArray(new Local[result.size()]);
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}
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}
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