1 files changed, 132 insertions, 0 deletions
diff --git a/src/jdk/nashorn/internal/runtime/linker/BoundCallableLinker.java b/src/jdk/nashorn/internal/runtime/linker/BoundCallableLinker.java
new file mode 100644
index 00000000..d52063bf
--- /dev/null
+++ b/src/jdk/nashorn/internal/runtime/linker/BoundCallableLinker.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.nashorn.internal.runtime.linker;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.util.Arrays;
+import jdk.internal.dynalink.CallSiteDescriptor;
+import jdk.internal.dynalink.linker.GuardedInvocation;
+import jdk.internal.dynalink.linker.LinkRequest;
+import jdk.internal.dynalink.linker.LinkerServices;
+import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
+import jdk.internal.dynalink.support.Guards;
+
+/**
+ * Links {@link BoundCallable} objects. Passes through to linker services for linking a callable (for either
+ * "dyn:call" or "dyn:new"), and modifies the returned invocation to deal with the receiver and argument binding.
+ */
+final class BoundCallableLinker implements TypeBasedGuardingDynamicLinker {
+    @Override
+    public boolean canLinkType(final Class<?> type) {
+        return type == BoundCallable.class;
+    }
+
+    @Override
+    public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception {
+        final Object objBoundCallable = linkRequest.getReceiver();
+        if(!(objBoundCallable instanceof BoundCallable)) {
+            return null;
+        }
+
+        final CallSiteDescriptor descriptor = linkRequest.getCallSiteDescriptor();
+        if (descriptor.getNameTokenCount() < 2 || !"dyn".equals(descriptor.getNameToken(CallSiteDescriptor.SCHEME))) {
+            return null;
+        }
+        final String operation = descriptor.getNameToken(CallSiteDescriptor.OPERATOR);
+        // We need to distinguish "dyn:new" from "dyn:call" because "dyn:call" sites have parameter list of the form
+        // "callee, this, args", while "dyn:call" sites have "callee, args" -- they lack the "this" parameter.
+        final boolean isCall;
+        if ("new".equals(operation)) {
+            isCall = false;
+        } else if ("call".equals(operation)) {
+            isCall = true;
+        } else {
+            // Only dyn:call and dyn:new are supported.
+            return null;
+        }
+        final BoundCallable boundCallable = (BoundCallable)objBoundCallable;
+        final Object callable = boundCallable.getCallable();
+        final Object boundThis = boundCallable.getBoundThis();
+
+        // We need to ask the linker services for a delegate invocation on the target callable.
+
+        // Replace arguments (boundCallable[, this], args) => (callable[, boundThis], boundArgs, args) when delegating
+        final Object[] args = linkRequest.getArguments();
+        final Object[] boundArgs = boundCallable.getBoundArgs();
+        final int argsLen = args.length;
+        final int boundArgsLen = boundArgs.length;
+        final Object[] newArgs = new Object[argsLen + boundArgsLen];
+        newArgs[0] = callable;
+        final int firstArgIndex;
+        if (isCall) {
+            newArgs[1] = boundThis;
+            firstArgIndex = 2;
+        } else {
+            firstArgIndex = 1;
+        }
+        System.arraycopy(boundArgs, 0, newArgs, firstArgIndex, boundArgsLen);
+        System.arraycopy(args, firstArgIndex, newArgs, firstArgIndex + boundArgsLen, argsLen - firstArgIndex);
+
+        // Use R(T0, T1, T2, ...) => R(callable.class, boundThis.class, boundArg0.class, ..., boundArgn.class, T2, ...)
+        // call site type when delegating to underlying linker (for dyn:new, there's no this).
+        final MethodType type = descriptor.getMethodType();
+        // Use R(T0, ...) => R(callable.class, ...)
+        MethodType newMethodType = descriptor.getMethodType().changeParameterType(0, callable.getClass());
+        if (isCall) {
+            // R(callable.class, T1, ...) => R(callable.class, boundThis.class, ...)
+            newMethodType = newMethodType.changeParameterType(1, boundThis.getClass());
+        }
+        // R(callable.class[, boundThis.class], T2, ...) => R(callable.class[, boundThis.class], boundArg0.class, ..., boundArgn.class, T2, ...)
+        for(int i = boundArgs.length; i-- > 0;) {
+            newMethodType = newMethodType.insertParameterTypes(firstArgIndex, boundArgs[i] == null ? Object.class : boundArgs[i].getClass());
+        }
+        final CallSiteDescriptor newDescriptor = descriptor.changeMethodType(newMethodType);
+
+        // Delegate to target's linker
+        final GuardedInvocation inv = linkerServices.getGuardedInvocation(linkRequest.replaceArguments(newDescriptor, newArgs));
+        if(inv == null) {
+            return null;
+        }
+
+        // Bind (callable[, boundThis], boundArgs) to the delegate handle
+        final MethodHandle boundHandle = MethodHandles.insertArguments(inv.getInvocation(), 0,
+                Arrays.copyOf(newArgs, firstArgIndex + boundArgs.length));
+        final Class<?> p0Type = type.parameterType(0);
+        final MethodHandle droppingHandle;
+        if (isCall) {
+            // Ignore incoming boundCallable and this
+            droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type, type.parameterType(1));
+        } else {
+            // Ignore incoming boundCallable
+            droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type);
+        }
+        // Identity guard on boundCallable object
+        final MethodHandle newGuard = Guards.getIdentityGuard(boundCallable);
+        return inv.replaceMethods(droppingHandle, newGuard.asType(newGuard.type().changeParameterType(0, p0Type)));
+    }
+}