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package org.zwobble.couscous.util.asm;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Ordering;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.jar.asm.Label;
import net.bytebuddy.jar.asm.MethodVisitor;
import java.util.List;
import static java.util.Arrays.asList;
import static org.zwobble.couscous.util.ExtraIterables.lazyMap;
import static org.zwobble.couscous.util.ExtraLists.list;
public class StackManipulationSwitch implements StackManipulation {
public static Case switchCase(int key, StackManipulation stackManipulation) {
return new Case(key, stackManipulation);
}
public static class Case {
private final int key;
private final StackManipulation stackManipulation;
private Case(int key, StackManipulation stackManipulation) {
this.key = key;
this.stackManipulation = stackManipulation;
}
}
private final StackManipulation defaultCase;
private final List<Case> cases;
public StackManipulationSwitch(StackManipulation defaultCase, List<Case> cases) {
this.defaultCase = defaultCase;
this.cases = Ordering.<Case>from((first, second) -> first.key - second.key).immutableSortedCopy(cases);
}
@Override
public boolean isValid() {
return true;
}
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
Label defaultLabel = new Label();
Label[] caseLabels = Iterables.toArray(lazyMap(cases, switchCase -> new Label()), Label.class);
return new StackManipulation.Compound(ImmutableList.copyOf(Iterables.concat(
list(
new StackManipulationLookupTable(
defaultLabel,
cases.stream().mapToInt(switchCase -> switchCase.key).toArray(),
caseLabels
)
),
lazyMap(cases, asList(caseLabels), (switchCase, label) -> new StackManipulation.Compound(
new StackManipulationLabel(label),
StackManipulationFrame.SAME,
switchCase.stackManipulation
)),
list(
new StackManipulationLabel(defaultLabel),
StackManipulationFrame.SAME,
defaultCase
)
))).apply(methodVisitor, implementationContext);
}
}
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