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[GR-59809] Filter StringConcatFactory.CACHE to only include reachable types in the image #10146

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Nov 25, 2024
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[GR-59809] Filter StringConcatFactory.CACHE to only include reachable types in the image #10146

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48 changes: 48 additions & 0 deletions ...rc/com.oracle.svm.hosted/src/com/oracle/svm/hosted/methodhandles/MethodHandleFeature.java
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Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,12 @@
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodType;
import java.lang.invoke.VarHandle;
import java.lang.ref.SoftReference;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
Expand Down Expand Up @@ -234,6 +236,52 @@ public Object transform(Object receiver, Object originalValue) {
}
});

if (JavaVersionUtil.JAVA_SPEC >= 24) {
/*
* StringConcatFactory$InlineHiddenClassStrategy was added in JDK 24, as well as its
* CACHE field, so there is no need to filter for previous JDK versions.
*/
Class<?> referencedKeyMapClazz = ReflectionUtil.lookupClass("jdk.internal.util.ReferencedKeyMap");
Method createMethod = ReflectionUtil.lookupMethod(referencedKeyMapClazz, "create", boolean.class, Supplier.class);
Method concurrentHashMapSupplierMethod = ReflectionUtil.lookupMethod(referencedKeyMapClazz, "concurrentHashMapSupplier");
Class<?> methodHandlePair = ReflectionUtil.lookupClass("java.lang.invoke.StringConcatFactory$InlineHiddenClassStrategy$MethodHandlePair");
Method constructorGetter = ReflectionUtil.lookupMethod(methodHandlePair, "constructor");
Method concatenatorGetter = ReflectionUtil.lookupMethod(methodHandlePair, "concatenator");

/*
* StringConcatFactory$InlineHiddenClassStrategy.CACHE is a cache like
* SpeciesData.transformHelpers, so it needs a similar transformation for the same
* reasons.
*/
access.registerFieldValueTransformer(
ReflectionUtil.lookupField(ReflectionUtil.lookupClass("java.lang.invoke.StringConcatFactory$InlineHiddenClassStrategy"), "CACHE"),
new FieldValueTransformerWithAvailability() {
@Override
public boolean isAvailable() {
return BuildPhaseProvider.isHostedUniverseBuilt();
}

@Override
@SuppressWarnings("unchecked")
public Object transform(Object receiver, Object originalValue) {
Map<Object, SoftReference<Object>> cache = (Map<Object, SoftReference<Object>>) originalValue;
Map<Object, Object> result = ReflectionUtil.invokeMethod(createMethod, null, true, ReflectionUtil.invokeMethod(concurrentHashMapSupplierMethod, null));

for (var entry : cache.entrySet()) {
SoftReference<Object> value = entry.getValue();
Object object = value.get();
MethodHandle constructor = ReflectionUtil.invokeMethod(constructorGetter, object);
MethodHandle concatenator = ReflectionUtil.invokeMethod(concatenatorGetter, object);
if (constructor != null && concatenator != null && heapScanner.isObjectReachable(constructor) && heapScanner.isObjectReachable(concatenator)) {
result.put(entry.getKey(), value);
}
}

return result;
}
});
}

/*
* Retrieve all six basic types from the java.lang.invoke.LambdaForm$BasicType class (void,
* int, long, float, double, Object) and invoke the
Expand Down