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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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*
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package com.oracle.svm.hosted.meta;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.graalvm.nativeimage.hosted.Feature;
import org.graalvm.nativeimage.ImageSingletons;
import com.oracle.graal.pointsto.meta.AnalysisField;
import com.oracle.svm.core.annotate.AutomaticFeature;
Tracks fields with constant values which could be inlined, but which must exist in memory -- for
example, when they might be accessed via JNI.
/**
* Tracks fields with constant values which could be inlined, but which must exist in memory -- for
* example, when they might be accessed via JNI.
*/
public class MaterializedConstantFields {
static void initialize() {
ImageSingletons.add(MaterializedConstantFields.class, new MaterializedConstantFields());
}
public static MaterializedConstantFields singleton() {
return ImageSingletons.lookup(MaterializedConstantFields.class);
}
private final Set<AnalysisField> fields = Collections.newSetFromMap(new ConcurrentHashMap<>());
private boolean sealed = false;
public void register(AnalysisField field) {
assert field.isStatic() && field.isFinal() : "Only required for static final fields";
assert field.isAccessed() : "Field must be accessed as read";
assert !sealed : "Already sealed";
fields.add(field);
}
public boolean contains(AnalysisField field) {
if (field.isStatic() && field.isFinal()) {
return fields.contains(field);
}
return false;
}
void seal() {
sealed = true;
}
}
@AutomaticFeature
class MaterializedConstantFieldsFeature implements Feature {
@Override
public void afterRegistration(AfterRegistrationAccess access) {
MaterializedConstantFields.initialize();
}
@Override
public void afterAnalysis(AfterAnalysisAccess access) {
MaterializedConstantFields.singleton().seal();
}
}