+package org.simantics.scl.compiler.elaboration.java;
+
+import org.cojen.classfile.TypeDesc;
+import org.objectweb.asm.Label;
+import org.simantics.scl.compiler.constants.FunctionValue;
+import org.simantics.scl.compiler.constants.LocalVariableConstant;
+import org.simantics.scl.compiler.internal.codegen.continuations.Cont;
+import org.simantics.scl.compiler.internal.codegen.references.IVal;
+import org.simantics.scl.compiler.internal.codegen.references.Val;
+import org.simantics.scl.compiler.internal.codegen.utils.LocalVariable;
+import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
+import org.simantics.scl.compiler.types.TVar;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+
+/**
+ * Dynamic :: a -> Dynamic
+ */
+public class DynamicConstructor extends FunctionValue {
+ private static final TVar A = Types.var(Kinds.STAR);
+ public static final DynamicConstructor INSTANCE = new DynamicConstructor();
+
+ private DynamicConstructor() {
+ super(new TVar[] {A}, Types.NO_EFFECTS, Types.DYNAMIC, A);
+ }
+
+ @Override
+ public Type applyExact(MethodBuilder mb, Val[] parameters) {
+ mb.pushBoxed(parameters[0]);
+ return Types.DYNAMIC;
+ }
+
+ @Override
+ public void deconstruct(MethodBuilder mb, IVal parameter, Cont success, Label failure) {
+ Type expectedType = success.getParameterType(0);
+ TypeDesc expectedTypeDesc = mb.getJavaTypeTranslator().toTypeDesc(expectedType);
+ TypeDesc expectedObjectTypeDesc = expectedTypeDesc.toObjectType();
+ LocalVariable cachedParameter = mb.cacheValue(parameter, Types.DYNAMIC);
+ mb.loadLocal(cachedParameter);
+ mb.instanceOf(expectedObjectTypeDesc);
+ mb.ifZeroComparisonBranch(failure, "==");
+
+ mb.loadLocal(cachedParameter);
+ mb.checkCast(expectedObjectTypeDesc);
+ mb.unbox(expectedType);
+ LocalVariable casted = mb.createLocalVariable("dynamicContent", expectedTypeDesc);
+ mb.storeLocal(casted);
+ mb.jump(success, new LocalVariableConstant(expectedType, casted));
+ }
+}