package org.dynjs.runtime.linker.js.reference; import org.dynjs.codegen.DereferencedReference; import org.dynjs.runtime.ExecutionContext; import org.dynjs.runtime.JSFunction; import org.dynjs.runtime.linker.java.DereferencedReferenceFilter; import org.dynjs.runtime.linker.java.ReferenceValueFilter; import org.projectodd.rephract.SmartLink; import org.projectodd.rephract.builder.LinkBuilder; import org.projectodd.rephract.guards.Guard; import java.lang.invoke.MethodHandle; import java.lang.invoke.MethodType; import static java.lang.invoke.MethodHandles.lookup; import static java.lang.invoke.MethodType.methodType; /** * @author Bob McWhirter */ public class FunctionDereferencedReferenceCallLink extends SmartLink implements Guard { public FunctionDereferencedReferenceCallLink(LinkBuilder builder) throws Exception { super(builder); this.builder = this.builder.guardWith(this); } public boolean guard(Object receiver, Object context, Object self, Object[] args) { return (receiver instanceof DereferencedReference) && (((DereferencedReference) receiver).getValue() instanceof JSFunction); } @Override public MethodHandle guardMethodHandle(MethodType inputType) throws Exception { return lookup() .findVirtual(FunctionDereferencedReferenceCallLink.class, "guard", methodType(boolean.class, Object.class, Object.class, Object.class, Object[].class)) .bindTo(this); } public MethodHandle guard() throws Exception { return this.builder.getGuard(); } public MethodHandle target() throws Exception { return builder .permute(1, 0, 0, 2, 3) .filter(1, DereferencedReferenceFilter.INSTANCE) .filter(2, ReferenceValueFilter.INSTANCE) .convert(Object.class, ExecutionContext.class, Object.class, JSFunction.class, Object.class, Object[].class) .invoke(lookup().findVirtual(ExecutionContext.class, "call", methodType(Object.class, Object.class, JSFunction.class, Object.class, Object[].class))) .target(); } }