1 files changed, 38 insertions, 0 deletions
diff --git a/src/library/scala/runtime/LambdaDeserialize.java b/src/library/scala/runtime/LambdaDeserialize.java
new file mode 100644
index 0000000000..4c5198cc48
--- /dev/null
+++ b/src/library/scala/runtime/LambdaDeserialize.java
@@ -0,0 +1,38 @@
+package scala.runtime;
+
+
+import java.lang.invoke.*;
+import java.util.HashMap;
+
+public final class LambdaDeserialize {
+    public static final MethodType DESERIALIZE_LAMBDA_MT = MethodType.fromMethodDescriptorString("(Ljava/lang/invoke/SerializedLambda;)Ljava/lang/Object;", LambdaDeserialize.class.getClassLoader());
+
+    private MethodHandles.Lookup lookup;
+    private final HashMap<String, MethodHandle> cache = new HashMap<>();
+    private final LambdaDeserializer$ l = LambdaDeserializer$.MODULE$;
+    private final HashMap<String, MethodHandle> targetMethodMap;
+
+    private LambdaDeserialize(MethodHandles.Lookup lookup, MethodHandle[] targetMethods) {
+        this.lookup = lookup;
+        targetMethodMap = new HashMap<>(targetMethods.length);
+        for (MethodHandle targetMethod : targetMethods) {
+            MethodHandleInfo info = lookup.revealDirect(targetMethod);
+            String key = nameAndDescriptorKey(info.getName(), info.getMethodType().toMethodDescriptorString());
+            targetMethodMap.put(key, targetMethod);
+        }
+    }
+
+    public Object deserializeLambda(SerializedLambda serialized) {
+        return l.deserializeLambda(lookup, cache, targetMethodMap, serialized);
+    }
+
+    public static CallSite bootstrap(MethodHandles.Lookup lookup, String invokedName,
+                                     MethodType invokedType, MethodHandle... targetMethods) throws Throwable {
+        MethodHandle deserializeLambda = lookup.findVirtual(LambdaDeserialize.class, "deserializeLambda", DESERIALIZE_LAMBDA_MT);
+        MethodHandle exact = deserializeLambda.bindTo(new LambdaDeserialize(lookup, targetMethods)).asType(invokedType);
+        return new ConstantCallSite(exact);
+    }
+    public static String nameAndDescriptorKey(String name, String descriptor) {
+        return name + descriptor;
+    }
+}