author | neliasso |
Fri, 29 Nov 2019 11:26:25 +0100 | |
changeset 59324 | 5e8f9713e343 |
parent 52381 | 7f90bc64b0fc |
permissions | -rw-r--r-- |
43972 | 1 |
/* |
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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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52381
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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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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52381
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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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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} |