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138 changes: 138 additions & 0 deletions
138
lib/src/main/java/com/diffplug/spotless/java/ModuleHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| /* | ||
| * Copyright 2016-2022 DiffPlug | ||
| * | ||
| * 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. | ||
| */ | ||
| package com.diffplug.spotless.java; | ||
|
|
||
| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.lang.reflect.Field; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Modifier; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| import javax.annotation.Nullable; | ||
|
|
||
| import com.diffplug.spotless.Jvm; | ||
|
|
||
| import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; | ||
| import sun.misc.Unsafe; | ||
|
|
||
| final class ModuleHelper { | ||
| // prevent direct instantiation | ||
| private ModuleHelper() {} | ||
|
|
||
| private static final Map<String, String> REQUIRED_PACKAGES_TO_TEST_CLASSES = new HashMap<>(); | ||
|
|
||
| static { | ||
| REQUIRED_PACKAGES_TO_TEST_CLASSES.putIfAbsent("com.sun.tools.javac.util", "Context"); | ||
| REQUIRED_PACKAGES_TO_TEST_CLASSES.putIfAbsent("com.sun.tools.javac.file", "CacheFSInfo"); | ||
| REQUIRED_PACKAGES_TO_TEST_CLASSES.putIfAbsent("com.sun.tools.javac.tree", "TreeTranslator"); | ||
| REQUIRED_PACKAGES_TO_TEST_CLASSES.putIfAbsent("com.sun.tools.javac.parser", "Tokens$TokenKind"); | ||
| REQUIRED_PACKAGES_TO_TEST_CLASSES.putIfAbsent("com.sun.tools.javac.api", "DiagnosticFormatter$PositionKind"); | ||
| } | ||
|
|
||
| private static boolean checkDone = false; | ||
|
|
||
| public static synchronized void doOpenInternalPackagesIfRequired() { | ||
| if (Jvm.version() < 16 || checkDone) { | ||
| return; | ||
| } | ||
| try { | ||
| checkDone = true; | ||
| final List<String> unavailableRequiredPackages = unavailableRequiredPackages(); | ||
| if (!unavailableRequiredPackages.isEmpty()) { | ||
| openPackages(unavailableRequiredPackages); | ||
| final List<String> failedToOpen = unavailableRequiredPackages(); | ||
| if (!failedToOpen.isEmpty()) { | ||
| final StringBuilder message = new StringBuilder(); | ||
| message.append("WARNING: Some required internal classes are unavailable. Please consider adding the following JVM arguments\n"); | ||
| message.append("WARNING: "); | ||
| for (String name : failedToOpen) { | ||
| message.append(String.format("--add-opens jdk.compiler/%s=ALL-UNNAMED", name)); | ||
| } | ||
| System.err.println(message); | ||
| } | ||
| } | ||
| } catch (Throwable e) { | ||
| System.err.println("WARNING: Failed to check for unavailable JDK packages. Reason: " + e.getMessage()); | ||
| } | ||
| } | ||
|
|
||
| @SuppressFBWarnings("REC_CATCH_EXCEPTION") // workaround JDK11 | ||
| private static List<String> unavailableRequiredPackages() { | ||
| final List<String> packages = new ArrayList<>(); | ||
| for (Map.Entry<String, String> e : REQUIRED_PACKAGES_TO_TEST_CLASSES.entrySet()) { | ||
| final String key = e.getKey(); | ||
| final String value = e.getValue(); | ||
| try { | ||
| final Class<?> clazz = Class.forName(key + "." + value); | ||
| if (clazz.isEnum()) { | ||
| clazz.getMethod("values").invoke(null); | ||
| } else { | ||
| clazz.getDeclaredConstructor().newInstance(); | ||
| } | ||
| } catch (IllegalAccessException ex) { | ||
| packages.add(key); | ||
| } catch (Exception ignore) { | ||
| // in old versions of JDK some classes could be unavailable | ||
| } | ||
| } | ||
| return packages; | ||
| } | ||
|
|
||
| @SuppressWarnings("unchecked") | ||
| private static void openPackages(Collection<String> packagesToOpen) throws Throwable { | ||
| final Collection<?> modules = allModules(); | ||
| if (modules == null) { | ||
| return; | ||
| } | ||
| final Unsafe unsafe = Unsafe.getUnsafe(); | ||
| final Field implLookupField = MethodHandles.Lookup.class.getDeclaredField("IMPL_LOOKUP"); | ||
| final MethodHandles.Lookup lookup = (MethodHandles.Lookup) unsafe.getObject( | ||
| unsafe.staticFieldBase(implLookupField), | ||
| unsafe.staticFieldOffset(implLookupField)); | ||
| final MethodHandle modifiers = lookup.findSetter(Method.class, "modifiers", Integer.TYPE); | ||
| final Method exportMethod = Class.forName("java.lang.Module").getDeclaredMethod("implAddOpens", String.class); | ||
| modifiers.invokeExact(exportMethod, Modifier.PUBLIC); | ||
| for (Object module : modules) { | ||
| final Collection<String> packages = (Collection<String>) module.getClass().getMethod("getPackages").invoke(module); | ||
| for (String name : packages) { | ||
| if (packagesToOpen.contains(name)) { | ||
| exportMethod.invoke(module, name); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @Nullable | ||
| @SuppressFBWarnings("REC_CATCH_EXCEPTION") // workaround JDK11 | ||
| private static Collection<?> allModules() { | ||
| // calling ModuleLayer.boot().modules() by reflection | ||
| try { | ||
| final Object boot = Class.forName("java.lang.ModuleLayer").getMethod("boot").invoke(null); | ||
| if (boot == null) { | ||
| return null; | ||
| } | ||
| final Object modules = boot.getClass().getMethod("modules").invoke(boot); | ||
| return (Collection<?>) modules; | ||
| } catch (Exception ignore) { | ||
| return null; | ||
| } | ||
| } | ||
| } |
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