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Diffstat (limited to 'src/jdk/nashorn/internal/runtime/CompiledFunctions.java')
-rw-r--r-- | src/jdk/nashorn/internal/runtime/CompiledFunctions.java | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/src/jdk/nashorn/internal/runtime/CompiledFunctions.java b/src/jdk/nashorn/internal/runtime/CompiledFunctions.java deleted file mode 100644 index ba5ae66c..00000000 --- a/src/jdk/nashorn/internal/runtime/CompiledFunctions.java +++ /dev/null @@ -1,114 +0,0 @@ -/* - * 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; - -import java.lang.invoke.MethodHandle; -import java.lang.invoke.MethodType; -import java.util.Iterator; -import java.util.TreeSet; - -/** - * This is a list of code versions of a function. - * The list is sorted in ascending order of generic descriptors - */ -@SuppressWarnings("serial") -final class CompiledFunctions extends TreeSet<CompiledFunction> { - - private CompiledFunction generic; - - CompiledFunction best(final MethodType type) { - final Iterator<CompiledFunction> iter = iterator(); - while (iter.hasNext()) { - final CompiledFunction next = iter.next(); - if (next.typeCompatible(type)) { - return next; - } - } - return generic(); - } - - boolean needsCallee() { - return ScriptFunctionData.needsCallee(mostGeneric().getInvoker()); - } - - CompiledFunction mostGeneric() { - return last(); - } - - CompiledFunction generic() { - CompiledFunction gen = this.generic; - if (gen == null) { - gen = this.generic = makeGeneric(mostGeneric()); - } - return gen; - } - - private static CompiledFunction makeGeneric(final CompiledFunction func) { - final MethodHandle invoker = composeGenericMethod(func.getInvoker()); - final MethodHandle constructor = func.hasConstructor() ? composeGenericMethod(func.getConstructor()) : null; - return new CompiledFunction(invoker.type(), invoker, constructor); - } - - /** - * Takes a method handle, and returns a potentially different method handle that can be used in - * {@code ScriptFunction#invoke(Object, Object...)} or {code ScriptFunction#construct(Object, Object...)}. - * The returned method handle will be sure to return {@code Object}, and will have all its parameters turned into - * {@code Object} as well, except for the following ones: - * <ul> - * <li>a last parameter of type {@code Object[]} which is used for vararg functions,</li> - * <li>the first argument, which is forced to be {@link ScriptFunction}, in case the function receives itself - * (callee) as an argument.</li> - * </ul> - * - * @param mh the original method handle - * - * @return the new handle, conforming to the rules above. - */ - private static MethodHandle composeGenericMethod(final MethodHandle mh) { - final MethodType type = mh.type(); - final boolean isVarArg = ScriptFunctionData.isVarArg(mh); - final int paramCount = isVarArg ? type.parameterCount() - 1 : type.parameterCount(); - - MethodType newType = MethodType.genericMethodType(paramCount, isVarArg); - - if (ScriptFunctionData.needsCallee(mh)) { - newType = newType.changeParameterType(0, ScriptFunction.class); - } - return type.equals(newType) ? mh : mh.asType(newType); - } - - /** - * Is the given type even more specific than this entire list? That means - * we have an opportunity for more specific versions of the method - * through lazy code generation - * - * @param type type to check against - * @return true if the given type is more specific than all invocations available - */ - boolean isLessSpecificThan(final MethodType type) { - return best(type).moreGenericThan(type); - } - -} |