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