jdk8-mips64-public/nashorn: src/jdk/internal/dynalink/linker/GuardedInvocation.java@e2497b11a021 (annotated)

src/jdk/internal/dynalink/linker/GuardedInvocation.java@e2497b11a021 (annotated)

src/jdk/internal/dynalink/linker/GuardedInvocation.java

Wed, 20 Aug 2014 10:26:01 +0200

author: attila
date: Wed, 20 Aug 2014 10:26:01 +0200
changeset 963: e2497b11a021
parent 962: ac62e33a99b0
child 1205: 4112748288bb
child 1231: 701c1dcdf733
permissions: -rw-r--r--

8027043: Turn global accesses into MethodHandle.constant, with one chance of reassignment, e.g. x = value occuring once in the global scope is ok, twice is not.
8027958: NASHORN TEST: Create tests to test markdown javascript engine work with Nashorn
8028345: Remove nashorn repo "bin" scripts to avoid confusion with JDK bin launcher programs
8029090: Developers should be able to pass nashorn properties and enable/disable JFR from command line
8030169: Need regression test for bug JDK-8010731
8033105: Make sure Nashorn test harness can run zlib benchmark
8033334: Make sure that scope depth information is maintained in the RecompilableScriptFunctionDatas, to avoid unnecessary slow proto linkage when doing on demand compilation
8034206: Make parts of code pipeline reusable in order to facilitate faster warmup and faster lazy compilation.
8035820: Optimistic recompilation
8035836: Array performance improvements
8036127: Prototype filter needs to be applied to getter guard as well, not just getter
8036986: Test should check that correctly type is returned running with optimistic. If optimistic assumption was wrong we should get the right one.
8037086: Check that deoptimizing recompilations are correct
8037177: -Dnashorn.optimistic should be enabled by default, meaning that it has to be explicitly set to false to run with the jdk 8 style conservative types
8037534: Use scope types to determine optimistic types
8037572: Add more test cases to check static types
8037967: Broke the build, by commiting without saving the last review comment
8038223: Symbol trace debug output takes time
8038396: fix for the compiler expression evaluator to be more inquisitive about types
8038398: OptimisticRecompilationTest fails on staging repo nashorn/jdk9/nashorn due to test framework
8038406: Testability: as a first step of moving loggers away from the process global space, the Debug object now supports logging POJOs from log entries as an event queue, which can be introspected from test scripts. This is way better than screen scraping brittle and subject-to-change log output.
8038413: NPE in unboxInteger
8038416: Access to undefined scoped variables deoptimized too much
8038426: Move all loggers from process wide scope into Global scope
8038799: Guard and unbox boxed primitives types on setting them in Properties to avoid megamorphisism
8038945: Simplify strict undefined checks
8039044: Expand undefined intrinsics for all commutative combinators of scrict undefined checks
8039746: Transform applies to calls wherever possible, for ScriptFunctions and JSObjects.
8040024: BranchOptimizer produces bad code for NaN FP comparison
8040089: Apply to call transform was incomplete. Now passes all tests and performance is back
8040093: Make sure that optimistic splitting works in optimistic types
8040102: Remove all references to Unsafe and definition of anonymous clases from the code
8040655: When processing a RewriteException debug object, the return value has already been reset to null. We need to catch this value before that.
8041434: Add synchronization to the common global constants structure
8041625: AccessorProperty currentType must only by Object.class when non-primitive, and scoping followup problem for lazily generated with bodies
8041905: Fix apply2call bug that prevented avatar.js unit tests from running correctly
8041995: Problems when loading tree expressions with several optimistic program points when optimistically initializing ObjectNodes
8042118: Separate types from symbols
8043002: Improve performance of Nashorn equality operators
8043003: Use strongly referenced generic invokers
8043004: Reduce variability at JavaAdapter call sites
8043132: Nashorn : all tests failed with java.security.AccessControlException
8043133: Fix corner cases of JDK-8041995
8043137: Collapse long sequences of NOP in Nashorn bytecode output
8043232: Index selection of overloaded java new constructors
8043235: Type-based optimizations interfere with continuation methods
8043431: Fix yet another corner case of JDK-8041995
8043504: Octane test harness was missing argument to print_always at one callsite, causing erroneous logging
8043605: Enable history for empty property maps
8043608: Make equality tests inline better
8043611: Move timing dependent benchmark for apply2call specialization to currently_failing. It is dependent that nothing takes machine time when doing the two runs, causing spurious assertions. Suggest running octane.raytrace manually instead to verify that this works, or incorporating it in the nightly test suite
8043632: Parallelize class installation and various script fixes.
8043633: In order to remove global state outside of contexts, make sure Timing class is an instance and not a static global collection of data. Move into Context. Move -Dnashorn.timing to an official logging option.
8043956: Make code caching work with optimistic typing and lazy compilation
8044012: Integrate the latest best known performance flags int ant octane jobs, and make sure that it's easy to compare 'ant octane-nashorn' and 'ant octane-v8' at the push of a button. (or rather; the entry of a command line)
8044102: Ensure bechmark exclude list for Octane benchmarks is in only one place, project.properties, and fix benchmark harness
8044154: Nashorn : all tests failed with java.security.AccessControlException
8044171: Make optimistic exception handlers smaller
8044502: Get rid of global optimistic flag
8044518: Ensure exceptions related to optimistic recompilation are not serializable
8044533: Deoptimizing negation produces wrong result for zero
8044534: Constant folding for unary + should produce int for boolean literals
8044760: Avoid PropertyMap duplicate for global instances
8044786: Some tests fail with non-optimistic compilation
8044803: Unnecessary restOf check
8044816: On-demand compiled top-level program doesn't need :createProgramFunction
8044851: nashorn properties leak memory
8046013: TypeError: Cannot apply "with" to non script object
8046014: MultiGlobalCompiledScript should cache :createProgramFunction handle
8046025: AccessorProperty.getGetter is not threadsafe
8046026: CompiledFunction.relinkComposableInvoker assert is being hit
8046201: Avoid repeated flattening of nested ConsStrings
8046215: Running uncompilable scripts throws NullPointerException
8046898: Make sure that lazy compilation is the default, remove redundant "enable lazy compilation" flags, added warning message if compile logging is enabled and lazy is switched off. Verified existing test suite code coverage equivalence between lazy and eager.
8046905: apply on apply is broken
8046921: Deoptimization type information peristence
8047035: (function() "hello")() crashes in Lexer with jdk9
8047057: Add a regression test for the passing test cases from JDK-8042304
8047067: all eval arguments need to be copied in Lower
8047078: Fuzzing bug discovered when ArrayLiteralNodes weren't immutable
8047166: 'do with({}) break ; while(0);' crashes in CodeGenerator
8047331: Assertion in CompiledFunction when running earley-boyer after Merge
8047357: More precise synthetic return + unreachable throw
8047359: large string size RangeError should be thrown rather than reporting negative length
8047369: Add regression tests for passing test cases of JDK-8024971
8047371: local variable declaration in TypeEvaluator should use ScriptObject.addOwnProperty instead of .set
8047728: (function(x){var o={x:0}; with(o){delete x} return o.x})() evaluates to 0 instead of undefined
8047959: bindings created for declarations in eval code are not mutable
8048009: Type info caching accidentally defeated
8048071: eval within 'with' statement does not use correct scope if with scope expression has a copy of eval
8048079: Persistent code store is broken after optimistic types merge
8048505: ScriptingFunctions.readFully couldn't handle file names represented as ConsStrings
8048586: String concatenation with optimistic types is slow
8048718: JSON.parse('{"0":0, "64":0}') throws ArrayindexOutOfBoundsException
8048869: Reduce compile time by about 5% by removing the Class.casts from the AST nodes
8049086: Minor API convenience functions on "Java" object
8049222: JSType class exposes public mutable arrays
8049223: RewriteException class exposes public mutable arrays
8049242: Explicit constructor overload selection should work with StaticClass as well
8049318: Test hideLocationProperties.js fails on Window due to backslash in path
8049524: Global object initialization via javax.script API should be minimal
8050432: javax.script.filename variable should not be enumerable with nashorn engine's ENGINE_SCOPE bindings
8050964: OptimisticTypesPersistence.java should use java.util.Date instead of java.sql.Date
8051019: Separate src and test execution sandbox directories
8051346: Test262 tests for ECMAScript 5 now in branch "es5-tests"
8051439: Wrong type calculated for ADD operator with undefined operand
8051839: GuardedInvocation needs to clone an argument
8053908: jdeps is not PATH on Mac, results in ant clean test failure on Mac
8053910: ScriptObjectMirror causing havoc with Invocation interface
8053913: Auto format caused warning in CompositeTypeBasedGuardingDynamicLinker
8054223: Nashorn: AssertionError when use __DIR__ and ScriptEngine.eval()
8054411: Add nashorn.args.prepend system property
8054503: test/script/external/test262/test/suite/ch12/12.6/12.6.4/12.6.4-2.js fails with tip
8054651: Global.initConstructor and ScriptFunction.getPrototype(Object) can have stricter types
8054898: Avoid creation of empty type info files
8054993: type info cache may be disabled for test262 and tests explicitly changing that property should use @fork
8055034: jjs exits interactive mode if exception was thrown when trying to print value of last evaluated expression
8055042: Compile-time expression evaluator was missing variables
8055107: Extension directives to turn on callsite profiling, tracing, AST print and other debug features locally
8055139: test/script/trusted/JDK-8055107.js fails with access control exception
8055186: Backport Nashorn optimistic typing to 8u repository
8055529: Clean up the bin directory
Reviewed-by: jlaskey, lagergren, sundar
Contributed-by: marcus.largergren@oracle.com, hannes.wallnoefer@oracle.com, sundararajan.athijegannathan@oracle.com

 /*
  * 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.
  */
 /*
  * This file is available under and governed by the GNU General Public
  * License version 2 only, as published by the Free Software Foundation.
  * However, the following notice accompanied the original version of this
  * file, and Oracle licenses the original version of this file under the BSD
  * license:
  */
 /*
    Copyright 2009-2013 Attila Szegedi
    Licensed under both the Apache License, Version 2.0 (the "Apache License")
    and the BSD License (the "BSD License"), with licensee being free to
    choose either of the two at their discretion.
    You may not use this file except in compliance with either the Apache
    License or the BSD License.
    If you choose to use this file in compliance with the Apache License, the
    following notice applies to you:
        You may obtain a copy of the Apache License at
            http://www.apache.org/licenses/LICENSE-2.0
        Unless required by applicable law or agreed to in writing, software
        distributed under the License is distributed on an "AS IS" BASIS,
        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
        implied. See the License for the specific language governing
        permissions and limitations under the License.
    If you choose to use this file in compliance with the BSD License, the
    following notice applies to you:
        Redistribution and use in source and binary forms, with or without
        modification, are permitted provided that the following conditions are
        met:
        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in the
          documentation and/or other materials provided with the distribution.
        * Neither the name of the copyright holder nor the names of
          contributors may be used to endorse or promote products derived from
          this software without specific prior written permission.
        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
        IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
        PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
        BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
        BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 package jdk.internal.dynalink.linker;
 import static jdk.nashorn.internal.lookup.Lookup.MH;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
 import java.lang.invoke.SwitchPoint;
 import java.lang.invoke.WrongMethodTypeException;
 import java.util.List;
 import jdk.internal.dynalink.CallSiteDescriptor;
 import jdk.internal.dynalink.support.Guards;
 /**
  * Represents a conditionally valid method handle. It is an immutable triple of an invocation method handle, a guard
  * method handle that defines the applicability of the invocation handle, and a switch point that can be used for
  * external invalidation of the invocation handle. The invocation handle is suitable for invocation if the guard
  * handle returns true for its arguments, and as long as the switch point is not invalidated. Both the guard and the
  * switch point are optional; neither, one, or both can be present.
  *
  * @author Attila Szegedi
  */
 public class GuardedInvocation {
     private final MethodHandle invocation;
     private final MethodHandle guard;
     private final Class<? extends Throwable> exception;
     private final SwitchPoint[] switchPoints;
     /**
      * Creates a new guarded invocation. This invocation is unconditional as it has no invalidations.
      *
      * @param invocation the method handle representing the invocation. Must not be null.
      * @throws NullPointerException if invocation is null.
      */
     public GuardedInvocation(final MethodHandle invocation) {
         this(invocation, null, (SwitchPoint)null, null);
     }
     /**
      * Creates a new guarded invocation.
      *
      * @param invocation the method handle representing the invocation. Must not be null.
      * @param guard the method handle representing the guard. Must have the same method type as the invocation, except
      * it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null to represent
      * an unconditional invocation, although that is unusual.
      * @throws NullPointerException if invocation is null.
      */
     public GuardedInvocation(final MethodHandle invocation, final MethodHandle guard) {
         this(invocation, guard, (SwitchPoint)null, null);
     }
     /**
      * Creates a new guarded invocation.
      *
      * @param invocation the method handle representing the invocation. Must not be null.
      * @param switchPoint the optional switch point that can be used to invalidate this linkage.
      * @throws NullPointerException if invocation is null.
      */
     public GuardedInvocation(final MethodHandle invocation, final SwitchPoint switchPoint) {
         this(invocation, null, switchPoint, null);
     }
     /**
      * Creates a new guarded invocation.
      *
      * @param invocation the method handle representing the invocation. Must not be null.
      * @param guard the method handle representing the guard. Must have the same method type as the invocation, except
      * it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null. If both it
      * and the switch point are null, this represents an unconditional invocation, which is legal but unusual.
      * @param switchPoint the optional switch point that can be used to invalidate this linkage.
      * @throws NullPointerException if invocation is null.
      */
     public GuardedInvocation(final MethodHandle invocation, final MethodHandle guard, final SwitchPoint switchPoint) {
         this(invocation, guard, switchPoint, null);
     }
     /**
      * Creates a new guarded invocation.
      *
      * @param invocation the method handle representing the invocation. Must not be null.
      * @param guard the method handle representing the guard. Must have the same method type as the invocation, except
      * it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null. If both it
      * and the switch point are null, this represents an unconditional invocation, which is legal but unusual.
      * @param switchPoint the optional switch point that can be used to invalidate this linkage.
      * @param exception the optional exception type that is expected to be thrown by the invocation and that also
      * invalidates the linkage.
      * @throws NullPointerException if invocation is null.
      */
     public GuardedInvocation(final MethodHandle invocation, final MethodHandle guard, final SwitchPoint switchPoint, final Class<? extends Throwable> exception) {
         invocation.getClass(); // NPE check
         this.invocation = invocation;
         this.guard = guard;
         this.switchPoints = switchPoint == null ? null : new SwitchPoint[] { switchPoint };
         this.exception = exception;
     }
     /**
      * Creates a new guarded invocation
      *
      * @param invocation the method handle representing the invocation. Must not be null.
      * @param guard the method handle representing the guard. Must have the same method type as the invocation, except
      * it must return boolean. For some useful guards, check out the {@link Guards} class. It can be null. If both it
      * and the switch point are null, this represents an unconditional invocation, which is legal but unusual.
      * @param switchPoints the optional switch points that can be used to invalidate this linkage.
      * @param exception the optional exception type that is expected to be thrown by the invocation and that also
      * invalidates the linkage.
      * @throws NullPointerException if invocation is null.
      */
     public GuardedInvocation(final MethodHandle invocation, final MethodHandle guard, final SwitchPoint[] switchPoints, final Class<? extends Throwable> exception) {
         invocation.getClass(); // NPE check
         this.invocation = invocation;
         this.guard = guard;
         this.switchPoints = switchPoints == null ? null : switchPoints.clone();
         this.exception = exception;
     }
     /**
      * Returns the invocation method handle.
      *
      * @return the invocation method handle. It will never be null.
      */
     public MethodHandle getInvocation() {
         return invocation;
     }
     /**
      * Returns the guard method handle.
      *
      * @return the guard method handle. Can be null.
      */
     public MethodHandle getGuard() {
         return guard;
     }
     /**
      * Returns the switch point that can be used to invalidate the invocation handle.
      *
      * @return the switch point that can be used to invalidate the invocation handle. Can be null.
      */
     public SwitchPoint[] getSwitchPoints() {
         return switchPoints == null ? null : switchPoints.clone();
     }
     /**
      * Returns the exception type that if thrown should be used to invalidate the linkage.
      *
      * @return the exception type that if thrown should be used to invalidate the linkage. Can be null.
      */
     public Class<? extends Throwable> getException() {
         return exception;
     }
     /**
      * Returns true if and only if this guarded invocation has a switchpoint, and that switchpoint has been invalidated.
      * @return true if and only if this guarded invocation has a switchpoint, and that switchpoint has been invalidated.
      */
     public boolean hasBeenInvalidated() {
         if (switchPoints == null) {
             return false;
         }
         for (final SwitchPoint sp : switchPoints) {
             if (sp.hasBeenInvalidated()) {
                 return true;
             }
         }
         return false;
     }
     /**
      * Asserts that the invocation is of the specified type, and the guard (if present) is of the specified type with a
      * boolean return type.
      *
      * @param type the asserted type
      * @throws WrongMethodTypeException if the invocation and the guard are not of the expected method type.
      */
     public void assertType(final MethodType type) {
         assertType(invocation, type);
         if (guard != null) {
             assertType(guard, type.changeReturnType(Boolean.TYPE));
         }
     }
     /**
      * Creates a new guarded invocation with different methods, preserving the switch point.
      *
      * @param newInvocation the new invocation
      * @param newGuard the new guard
      * @return a new guarded invocation with the replaced methods and the same switch point as this invocation.
      */
     public GuardedInvocation replaceMethods(final MethodHandle newInvocation, final MethodHandle newGuard) {
         return new GuardedInvocation(newInvocation, newGuard, switchPoints, exception);
     }
     /**
      * Add a switchpoint to this guarded invocation
      * @param newSwitchPoint new switchpoint, or null for nop
      * @return new guarded invocation with the extra switchpoint
      */
     public GuardedInvocation addSwitchPoint(final SwitchPoint newSwitchPoint) {
         if (newSwitchPoint == null) {
             return this;
         }
         final SwitchPoint[] newSwitchPoints;
         if (switchPoints != null) {
             newSwitchPoints = new SwitchPoint[switchPoints.length + 1];
             System.arraycopy(switchPoints, 0, newSwitchPoints, 0, switchPoints.length);
             newSwitchPoints[switchPoints.length] = newSwitchPoint;
         } else {
             newSwitchPoints = new SwitchPoint[] { newSwitchPoint };
         }
         return new GuardedInvocation(invocation, guard, newSwitchPoints, exception);
     }
     private GuardedInvocation replaceMethodsOrThis(final MethodHandle newInvocation, final MethodHandle newGuard) {
         if (newInvocation == invocation && newGuard == guard) {
             return this;
         }
         return replaceMethods(newInvocation, newGuard);
     }
     /**
      * Changes the type of the invocation, as if {@link MethodHandle#asType(MethodType)} was applied to its invocation
      * and its guard, if it has one (with return type changed to boolean, and parameter count potentially truncated for
      * the guard). If the invocation already is of the required type, returns this object.
      * @param newType the new type of the invocation.
      * @return a guarded invocation with the new type applied to it.
      */
     public GuardedInvocation asType(final MethodType newType) {
         return replaceMethodsOrThis(invocation.asType(newType), guard == null ? null : Guards.asType(guard, newType));
     }
     /**
      * Changes the type of the invocation, as if {@link LinkerServices#asType(MethodHandle, MethodType)} was applied to
      * its invocation and its guard, if it has one (with return type changed to boolean, and parameter count potentially
      * truncated for the guard). If the invocation already is of the required type, returns this object.
      * @param linkerServices the linker services to use for the conversion
      * @param newType the new type of the invocation.
      * @return a guarded invocation with the new type applied to it.
      */
     public GuardedInvocation asType(final LinkerServices linkerServices, final MethodType newType) {
         return replaceMethodsOrThis(linkerServices.asType(invocation, newType), guard == null ? null :
             Guards.asType(linkerServices, guard, newType));
     }
     /**
      * Changes the type of the invocation, as if {@link LinkerServices#asTypeLosslessReturn(MethodHandle, MethodType)} was
      * applied to its invocation and {@link LinkerServices#asType(MethodHandle, MethodType)} applied to its guard, if it
      * has one (with return type changed to boolean, and parameter count potentially truncated for the guard). If the
      * invocation doesn't change its type, returns this object.
      * @param linkerServices the linker services to use for the conversion
      * @param newType the new type of the invocation.
      * @return a guarded invocation with the new type applied to it.
      */
     public GuardedInvocation asTypeSafeReturn(final LinkerServices linkerServices, final MethodType newType) {
         return replaceMethodsOrThis(linkerServices.asTypeLosslessReturn(invocation, newType), guard == null ? null :
             Guards.asType(linkerServices, guard, newType));
     }
     /**
      * Changes the type of the invocation, as if {@link MethodHandle#asType(MethodType)} was applied to its invocation
      * and its guard, if it has one (with return type changed to boolean for guard). If the invocation already is of the
      * required type, returns this object.
      * @param desc a call descriptor whose method type is adapted.
      * @return a guarded invocation with the new type applied to it.
      */
     public GuardedInvocation asType(final CallSiteDescriptor desc) {
         return asType(desc.getMethodType());
     }
     /**
      * Applies argument filters to both the invocation and the guard (if there is one).
      * @param pos the position of the first argumen being filtered
      * @param filters the argument filters
      * @return a filtered invocation
      */
     public GuardedInvocation filterArguments(final int pos, final MethodHandle... filters) {
         return replaceMethods(MethodHandles.filterArguments(invocation, pos, filters), guard == null ? null :
             MethodHandles.filterArguments(guard, pos, filters));
     }
     /**
      * Makes an invocation that drops arguments in both the invocation and the guard (if there is one).
      * @param pos the position of the first argument being dropped
      * @param valueTypes the types of the values being dropped
      * @return an invocation that drops arguments
      */
     public GuardedInvocation dropArguments(final int pos, final List<Class<?>> valueTypes) {
         return replaceMethods(MethodHandles.dropArguments(invocation, pos, valueTypes), guard == null ? null :
             MethodHandles.dropArguments(guard, pos, valueTypes));
     }
     /**
      * Makes an invocation that drops arguments in both the invocation and the guard (if there is one).
      * @param pos the position of the first argument being dropped
      * @param valueTypes the types of the values being dropped
      * @return an invocation that drops arguments
      */
     public GuardedInvocation dropArguments(final int pos, final Class<?>... valueTypes) {
         return replaceMethods(MethodHandles.dropArguments(invocation, pos, valueTypes), guard == null ? null :
             MethodHandles.dropArguments(guard, pos, valueTypes));
     }
     /**
      * Composes the invocation, switchpoint, and the guard into a composite method handle that knows how to fall back.
      * @param fallback the fallback method handle in case switchpoint is invalidated or guard returns false.
      * @return a composite method handle.
      */
     public MethodHandle compose(final MethodHandle fallback) {
         return compose(fallback, fallback, fallback);
     }
     /**
      * Composes the invocation, switchpoint, and the guard into a composite method handle that knows how to fall back.
      * @param switchpointFallback the fallback method handle in case switchpoint is invalidated.
      * @param guardFallback the fallback method handle in case guard returns false.
      * @param catchFallback the fallback method in case the exception handler triggers
      * @return a composite method handle.
      */
     public MethodHandle compose(final MethodHandle guardFallback, final MethodHandle switchpointFallback, final MethodHandle catchFallback) {
         final MethodHandle guarded =
                 guard == null ?
                         invocation :
                         MethodHandles.guardWithTest(
                                 guard,
                                 invocation,
                                 guardFallback);
         final MethodHandle catchGuarded =
                 exception == null ?
                         guarded :
                         MH.catchException(
                                 guarded,
                                 exception,
                                 MethodHandles.dropArguments(
                                     catchFallback,
 ,
                                     exception));
         if (switchPoints == null) {
             return catchGuarded;
         }
         MethodHandle spGuarded = catchGuarded;
         for (final SwitchPoint sp : switchPoints) {
             spGuarded = sp.guardWithTest(spGuarded, switchpointFallback);
         }
         return spGuarded;
     }
     private static void assertType(final MethodHandle mh, final MethodType type) {
         if(!mh.type().equals(type)) {
             throw new WrongMethodTypeException("Expected type: " + type + " actual type: " + mh.type());
         }
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/internal/dynalink/linker/GuardedInvocation.java@e2497b11a021 (annotated)

src/jdk/internal/dynalink/linker/GuardedInvocation.java