langtools/test/tools/javac/lambda/speculative/InferStrict.java
author mcimadamore
Tue, 15 Sep 2015 13:43:44 +0100
changeset 32709 55d136799f79
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8078093: Severe compiler performance regression Java 7 to 8 for nested method invocations Summary: Add infrastructure to avoid combinatorial explosion of method argument attributions Reviewed-by: jlahoda, vromero, dlsmith
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/*
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 * Copyright (c) 2015, 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.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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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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 /*
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  * @test
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  * @bug 8078093
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  * @summary Exponential performance regression Java 8 compiler compared to Java 7 compiler
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  * @compile InferStrict.java
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  */
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import java.util.HashSet;
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import java.util.Set;
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class InferStrict {
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    public <T> Set<T> compute(Set<T> t) { return t; }
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    public <T> T join(Set<T> t1, Set<T> t2) { return null; }
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    public <T extends InferStrict> T compute() { return null; }
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    public void test() {
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        join(
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            compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(new HashSet<>()))))))))))))))))),
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            compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(compute(new HashSet<String>())))))))))))))))))
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        ).length();
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     }
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}