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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the 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.
*/
package org.codehaus.groovy.vmplugin.v7;
import groovy.lang.GroovySystem;
import groovy.lang.MetaClassRegistryChangeEvent;
import groovy.lang.MetaClassRegistryChangeEventListener;
import java.lang.invoke.*;
import java.lang.invoke.MethodHandles.Lookup;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.codehaus.groovy.GroovyBugError;
/**
* Bytecode level interface for bootstrap methods used by invokedynamic.
* This class provides a logging ability by using the boolean system property
* groovy.indy.logging. Other than that this class contains the
* interfacing methods with bytecode for invokedynamic as well as some helper
* methods and classes.
*
* @author Jochen "blackdrag" Theodorou
*/
public class IndyInterface {
/**
* flags for method and property calls
*/
public static final int
SAFE_NAVIGATION = 1, THIS_CALL = 2,
GROOVY_OBJECT = 4, IMPLICIT_THIS = 8,
SPREAD_CALL = 16, UNCACHED_CALL = 32;
/**
* Enum for easy differentiation between call types
* @author Jochen "blackdrag" Theodorou
*/
public static enum CALL_TYPES {
/**Method invocation type*/ METHOD("invoke"),
/**Constructor invocation type*/ INIT("init"),
/**Get property invocation type*/ GET("getProperty"),
/**Set property invocation type*/ SET("setProperty"),
/**Cast invocation type*/ CAST("cast");
/**The name of the call site type*/
private final String name;
private CALL_TYPES(String callSiteName) {
this.name = callSiteName;
}
/** Returns the name of the call site type */
public String getCallSiteName(){ return name; }
}
/** Logger */
protected static final Logger LOG;
/** boolean to indicate if logging for indy is enabled */
protected static final boolean LOG_ENABLED;
static {
boolean enableLogger = false;
LOG = Logger.getLogger(IndyInterface.class.getName());
try {
if (System.getProperty("groovy.indy.logging")!=null) {
LOG.setLevel(Level.ALL);
enableLogger = true;
}
} catch (SecurityException e) {
// Allow security managers to prevent system property access
}
LOG_ENABLED = enableLogger;
}
/** LOOKUP constant used for for example unreflect calls */
public static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
/** handle for the selectMethod method */
private static final MethodHandle SELECT_METHOD;
static {
MethodType mt = MethodType.methodType(Object.class, MutableCallSite.class, Class.class, String.class, int.class, Boolean.class, Boolean.class, Boolean.class, Object.class, Object[].class);
try {
SELECT_METHOD = LOOKUP.findStatic(IndyInterface.class, "selectMethod", mt);
} catch (Exception e) {
throw new GroovyBugError(e);
}
}
protected static SwitchPoint switchPoint = new SwitchPoint();
static {
GroovySystem.getMetaClassRegistry().addMetaClassRegistryChangeEventListener(new MetaClassRegistryChangeEventListener() {
public void updateConstantMetaClass(MetaClassRegistryChangeEvent cmcu) {
invalidateSwitchPoints();
}
});
}
/**
* Callback for constant meta class update change
*/
protected static void invalidateSwitchPoints() {
if (LOG_ENABLED) {
LOG.info("invalidating switch point");
}
synchronized(IndyInterface.class) {
SwitchPoint old = switchPoint;
switchPoint = new SwitchPoint();
SwitchPoint.invalidateAll(new SwitchPoint[]{old});
}
}
/**
* bootstrap method for method calls from Groovy compiled code with indy
* enabled. This method gets a flags parameter which uses the following
* encoding:
* - {@value #SAFE_NAVIGATION} is the flag value for safe navigation see {@link #SAFE_NAVIGATION}
* - {@value #THIS_CALL} is the flag value for a call on this see {@link #THIS_CALL}
*
* @param caller - the caller
* @param callType - the type of the call
* @param type - the call site type
* @param name - the real method name
* @param flags - call flags
* @return the produced CallSite
* @since Groovy 2.1.0
*/
public static CallSite bootstrap(Lookup caller, String callType, MethodType type, String name, int flags) {
boolean safe = (flags&SAFE_NAVIGATION)!=0;
boolean thisCall = (flags&THIS_CALL)!=0;
boolean spreadCall = (flags&SPREAD_CALL)!=0;
int callID;
if (callType.equals(CALL_TYPES.METHOD.getCallSiteName())) {
callID = CALL_TYPES.METHOD.ordinal();
} else if (callType.equals(CALL_TYPES.INIT.getCallSiteName())) {
callID = CALL_TYPES.INIT.ordinal();
} else if (callType.equals(CALL_TYPES.GET.getCallSiteName())) {
callID = CALL_TYPES.GET.ordinal();
} else if (callType.equals(CALL_TYPES.SET.getCallSiteName())) {
callID = CALL_TYPES.SET.ordinal();
} else if (callType.equals(CALL_TYPES.CAST.getCallSiteName())) {
callID = CALL_TYPES.CAST.ordinal();
}else {
throw new GroovyBugError("Unknown call type: "+callType);
}
return realBootstrap(caller, name, callID, type, safe, thisCall, spreadCall);
}
/**
* bootstrap method for method calls with "this" as receiver
* @deprecated since Groovy 2.1.0
*/
@Deprecated
public static CallSite bootstrapCurrent(Lookup caller, String name, MethodType type) {
return realBootstrap(caller, name, CALL_TYPES.METHOD.ordinal(), type, false, true, false);
}
/**
* bootstrap method for method calls with "this" as receiver safe
* @deprecated since Groovy 2.1.0
*/
@Deprecated
public static CallSite bootstrapCurrentSafe(Lookup caller, String name, MethodType type) {
return realBootstrap(caller, name, CALL_TYPES.METHOD.ordinal(), type, true, true, false);
}
/**
* bootstrap method for standard method calls
* @deprecated since Groovy 2.1.0
*/
@Deprecated
public static CallSite bootstrap(Lookup caller, String name, MethodType type) {
return realBootstrap(caller, name, CALL_TYPES.METHOD.ordinal(), type, false, false, false);
}
/**
* bootstrap method for null safe standard method calls
* @deprecated since Groovy 2.1.0
*/
@Deprecated
public static CallSite bootstrapSafe(Lookup caller, String name, MethodType type) {
return realBootstrap(caller, name, CALL_TYPES.METHOD.ordinal(), type, true, false, false);
}
/**
* backing bootstrap method with all parameters
*/
private static CallSite realBootstrap(Lookup caller, String name, int callID, MethodType type, boolean safe, boolean thisCall, boolean spreadCall) {
// since indy does not give us the runtime types
// we produce first a dummy call site, which then changes the target to one,
// that does the method selection including the the direct call to the
// real method.
MutableCallSite mc = new MutableCallSite(type);
MethodHandle mh = makeFallBack(mc,caller.lookupClass(),name,callID,type,safe,thisCall,spreadCall);
mc.setTarget(mh);
return mc;
}
/**
* Makes a fallback method for an invalidated method selection
*/
protected static MethodHandle makeFallBack(MutableCallSite mc, Class sender, String name, int callID, MethodType type, boolean safeNavigation, boolean thisCall, boolean spreadCall) {
MethodHandle mh = MethodHandles.insertArguments(SELECT_METHOD, 0, mc, sender, name, callID, safeNavigation, thisCall, spreadCall, /*dummy receiver:*/ 1);
mh = mh.asCollector(Object[].class, type.parameterCount()).
asType(type);
return mh;
}
/**
* Core method for indy method selection using runtime types.
*/
public static Object selectMethod(MutableCallSite callSite, Class sender, String methodName, int callID, Boolean safeNavigation, Boolean thisCall, Boolean spreadCall, Object dummyReceiver, Object[] arguments) throws Throwable {
Selector selector = Selector.getSelector(callSite, sender, methodName, callID, safeNavigation, thisCall, spreadCall, arguments);
selector.setCallSiteTarget();
MethodHandle call = selector.handle.asSpreader(Object[].class, arguments.length);
call = call.asType(MethodType.methodType(Object.class,Object[].class));
return call.invokeExact(arguments);
}
}