langtools/test/tools/javac/lambda/speculative/T8055984.java
author mcimadamore
Tue, 15 Sep 2015 13:43:44 +0100
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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 8055894
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 * @summary Exponential performance regression Java 8 compiler compared to Java 7 compiler
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 * @compile T8055984.java
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 */
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class T8055984 {
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    static class C<U> {
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        U fu;
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        C() { }
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        C(C<U> other) {
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            this.fu = other.fu;
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        }
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        C(U fu) {
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            this.fu = fu;
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        }
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    }
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    static <U> C<U> m(C<U> src) { return new C<U>(src); }
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    static void test() {
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        C<String> c2 = m(new C<>(m(new C<>() )) );
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        C<String> c3 = m(new C<>(m(new C<>(m(new C<>() )) )) );
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        C<String> c4 = m(new C<>(m(new C<>(m(new C<>(m(new C<>() )) )) )) );
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        C<String> c5 = m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>() )) )) )) )) );
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        C<String> c6 = m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>() )) )) )) )) )) );
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        C<String> c7 = m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>() )) )) )) )) )) )) );
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        C<String> c8 = m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>() )) )) )) )) )) )) )) );
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        C<String> c9 = m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>() )) )) )) )) )) )) )) )) );
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        C<String> c10 = m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>(m(new C<>())))))))))))))))))));
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    }
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}
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