113 lines
5.0 KiB
Java
113 lines
5.0 KiB
Java
/*
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* Copyright (c) 2015, 2016, 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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/* @test
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* @bug 8160717
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* @run main/othervm -ea -esa -Djava.lang.invoke.MethodHandle.COMPILE_THRESHOLD=-1 test.java.lang.invoke.LoopCombinatorLongSignatureTest
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* @run main/othervm -ea -esa test.java.lang.invoke.LoopCombinatorLongSignatureTest
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*/
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package test.java.lang.invoke;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.util.Arrays;
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/**
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* If a loop with an excessive amount of clauses is created, so that the number of parameters to the resulting loop
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* handle exceeds the allowed maximum, an IAE must be signalled. The test is run first in LambdaForm interpretation mode
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* and then in default mode, wherein bytecode generation falls back to LFI mode due to excessively long methods.
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* <p>
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* By default, the test run only checks whether loop handle construction succeeds and fails. If executing the generated
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* loops is desired, this should be indicated by setting the {@code java.lang.invoke.LoopCombinatorLongSignatureTest.RUN}
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* environment variable to {@code true}. This is disabled by default as it considerably increases the time needed to run
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* the test.
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*/
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public class LoopCombinatorLongSignatureTest {
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static final MethodHandle INIT = MethodHandles.constant(int.class, 0);
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static final MethodHandle STEP = MethodHandles.identity(int.class);
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static final MethodHandle PRED_F = MethodHandles.constant(boolean.class, false);
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static final MethodHandle PRED_T = MethodHandles.constant(boolean.class, true);
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static final MethodHandle FINI = MethodHandles.identity(int.class);
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static final int ARG_LIMIT = 254; // for internal reasons, this is the maximum allowed number of arguments
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public static void main(String[] args) {
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boolean run = Boolean.parseBoolean(
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System.getProperty("java.lang.invoke.LoopCombinatorLongSignatureTest.RUN", "false"));
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for (int loopArgs = 0; loopArgs < 2; ++loopArgs) {
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testLongSignature(loopArgs, false, run);
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testLongSignature(loopArgs, true, run);
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}
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}
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static void testLongSignature(int loopArgs, boolean excessive, boolean run) {
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int nClauses = ARG_LIMIT - loopArgs + (excessive ? 1 : 0);
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System.out.print((excessive ? "(EXCESSIVE)" : "(LONG )") + " arguments: " + loopArgs + ", clauses: " + nClauses + " -> ");
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// extend init to denote what arguments the loop should accept
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Class<?>[] argTypes = new Class<?>[loopArgs];
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Arrays.fill(argTypes, int.class);
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MethodHandle init = MethodHandles.dropArguments(INIT, 0, argTypes);
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// build clauses
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MethodHandle[][] clauses = new MethodHandle[nClauses][];
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MethodHandle[] clause = {init, STEP, PRED_T, FINI};
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MethodHandle[] fclause = {init, STEP, PRED_F, FINI};
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Arrays.fill(clauses, clause);
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clauses[nClauses - 1] = fclause; // make the last clause terminate the loop
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try {
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MethodHandle loop = MethodHandles.loop(clauses);
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if (excessive) {
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throw new AssertionError("loop construction should have failed");
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} else if (run) {
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int r;
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if (loopArgs == 0) {
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r = (int) loop.invoke();
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} else {
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Object[] args = new Object[loopArgs];
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Arrays.fill(args, 0);
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r = (int) loop.invokeWithArguments(args);
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}
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System.out.println("SUCCEEDED (OK) -> " + r);
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} else {
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System.out.println("SUCCEEDED (OK)");
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}
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} catch (IllegalArgumentException iae) {
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if (excessive) {
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System.out.println("FAILED (OK)");
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} else {
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iae.printStackTrace(System.out);
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throw new AssertionError("loop construction should not have failed (see above)");
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}
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} catch (Throwable t) {
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t.printStackTrace(System.out);
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throw new AssertionError("unexpected failure (see above)");
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}
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}
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}
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