36 lines
1.4 KiB
Java
36 lines
1.4 KiB
Java
package us.myles.ViaVersion.compatibility.jre16;
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import us.myles.ViaVersion.compatibility.FieldModifierAccessor;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.lang.reflect.Field;
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import java.util.Objects;
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@SuppressWarnings({
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"java:S1191", // SonarLint/-Qube/-Cloud: We (sadly) need Unsafe for the Java 16 impl.
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"java:S3011", // ^: We need to circumvent the access restrictions of fields.
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})
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public final class Jre16FieldModifierAccessor implements FieldModifierAccessor {
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private final VarHandle modifiersHandle;
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public Jre16FieldModifierAccessor() throws ReflectiveOperationException {
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final Field theUnsafeField = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
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theUnsafeField.setAccessible(true);
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final sun.misc.Unsafe unsafe = (sun.misc.Unsafe) theUnsafeField.get(null);
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final Field trustedLookup = MethodHandles.Lookup.class.getDeclaredField("IMPL_LOOKUP");
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final MethodHandles.Lookup lookup = (MethodHandles.Lookup) unsafe.getObject(
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unsafe.staticFieldBase(trustedLookup), unsafe.staticFieldOffset(trustedLookup));
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this.modifiersHandle = lookup.findVarHandle(Field.class, "modifiers", int.class);
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}
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@Override
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public void setModifiers(final Field field, final int modifiers) {
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Objects.requireNonNull(field, "field must not be null");
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this.modifiersHandle.set(field, modifiers);
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}
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}
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