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Fix jdk17 incompatibility of ClassInitializationDeadlock (#1936)
Fix jdk17 incompatibility of ClassInitializationDeadlock
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...e-error-prone/src/main/java/com/palantir/baseline/errorprone/BaselineErrorProneScope.java
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/* | ||
* (c) Copyright 2021 Palantir Technologies Inc. All rights reserved. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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package com.palantir.baseline.errorprone; | ||
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import static com.google.common.base.Preconditions.checkState; | ||
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import com.google.errorprone.util.RuntimeVersion; | ||
import com.sun.tools.javac.code.Scope; | ||
import com.sun.tools.javac.code.Scope.LookupKind; | ||
import com.sun.tools.javac.code.Symbol; | ||
import java.lang.reflect.InvocationHandler; | ||
import java.lang.reflect.Method; | ||
import java.lang.reflect.Proxy; | ||
import java.util.Arrays; | ||
import java.util.function.Predicate; | ||
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/** | ||
* A compatibility wrapper around {@link com.sun.tools.javac.util.Filter}. | ||
* Adapted from {@link com.google.errorprone.util.ErrorProneScope} with additional methods. | ||
* | ||
* Original code from (Apache-2.0 License): | ||
* https://github.com/google/error-prone/blob/ce87ca1c7bb005371837b82ffa69041dd8a356e5/check_api/src/main/java/com/google/errorprone/util/ErrorProneScope.java | ||
* | ||
* TODO(fwindheuser): Delete after upstreaming missing methods into "ErrorProneScope". | ||
*/ | ||
@SuppressWarnings("ThrowError") | ||
public final class BaselineErrorProneScope { | ||
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@SuppressWarnings("unchecked") // reflection | ||
public Iterable<Symbol> getSymbols(Predicate<Symbol> predicate, LookupKind lookupKind) { | ||
return (Iterable<Symbol>) invoke(getSymbols, maybeAsFilter(predicate), lookupKind); | ||
} | ||
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private static final Class<?> FILTER_CLASS = getFilterClass(); | ||
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private static Class<?> getFilterClass() { | ||
if (RuntimeVersion.isAtLeast17()) { | ||
return null; | ||
} | ||
try { | ||
return Class.forName("com.sun.tools.javac.util.Filter"); | ||
} catch (ClassNotFoundException e) { | ||
throw new LinkageError(e.getMessage(), e); | ||
} | ||
} | ||
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private static final Method getSymbols = getImpl("getSymbols", Predicate.class, LookupKind.class); | ||
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private static Method getImpl(String name, Class<?>... parameters) { | ||
return FILTER_CLASS != null | ||
? getMethodOrDie( | ||
Scope.class, | ||
name, | ||
Arrays.stream(parameters) | ||
.map(p -> p.equals(Predicate.class) ? FILTER_CLASS : p) | ||
.toArray(Class<?>[]::new)) | ||
: getMethodOrDie(Scope.class, name, parameters); | ||
} | ||
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private final Scope scope; | ||
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BaselineErrorProneScope(Scope scope) { | ||
this.scope = scope; | ||
} | ||
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private Object invoke(Method method, Object... args) { | ||
try { | ||
return method.invoke(scope, args); | ||
} catch (ReflectiveOperationException e) { | ||
throw new LinkageError(e.getMessage(), e); | ||
} | ||
} | ||
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@SuppressWarnings("ProxyNonConstantType") | ||
private Object maybeAsFilter(Predicate<Symbol> predicate) { | ||
if (FILTER_CLASS == null) { | ||
return predicate; | ||
} | ||
return Proxy.newProxyInstance( | ||
getClass().getClassLoader(), new Class<?>[] {FILTER_CLASS}, new InvocationHandler() { | ||
@Override | ||
public Object invoke(Object proxy, Method method, Object[] args) { | ||
checkState(method.getName().equals("accepts")); | ||
return predicate.test((Symbol) args[0]); | ||
} | ||
}); | ||
} | ||
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private static Method getMethodOrDie(Class<?> clazz, String name, Class<?>... parameters) { | ||
try { | ||
return clazz.getMethod(name, parameters); | ||
} catch (NoSuchMethodException e) { | ||
throw new LinkageError(e.getMessage(), e); | ||
} | ||
} | ||
} |
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type: fix | ||
fix: | ||
description: Fix jdk17 incompatibility of ClassInitializationDeadlock | ||
links: | ||
- https://github.com/palantir/gradle-baseline/pull/1936 |