use of java.lang.invoke.CallSite in project elasticsearch by elastic.
the class Def method lookupReferenceInternal.
/** Returns a method handle to an implementation of clazz, given method reference signature. */
private static MethodHandle lookupReferenceInternal(Lookup lookup, Definition.Type clazz, String type, String call, Class<?>... captures) throws Throwable {
final FunctionRef ref;
if ("this".equals(type)) {
// user written method
Method interfaceMethod = clazz.struct.getFunctionalMethod();
if (interfaceMethod == null) {
throw new IllegalArgumentException("Cannot convert function reference [" + type + "::" + call + "] " + "to [" + clazz.name + "], not a functional interface");
}
int arity = interfaceMethod.arguments.size() + captures.length;
final MethodHandle handle;
try {
MethodHandle accessor = lookup.findStaticGetter(lookup.lookupClass(), getUserFunctionHandleFieldName(call, arity), MethodHandle.class);
handle = (MethodHandle) accessor.invokeExact();
} catch (NoSuchFieldException | IllegalAccessException e) {
// because the arity does not match the expected interface type.
if (call.contains("$")) {
throw new IllegalArgumentException("Incorrect number of parameters for [" + interfaceMethod.name + "] in [" + clazz.clazz + "]");
}
throw new IllegalArgumentException("Unknown call [" + call + "] with [" + arity + "] arguments.");
}
ref = new FunctionRef(clazz, interfaceMethod, handle, captures.length);
} else {
// whitelist lookup
ref = new FunctionRef(clazz, type, call, captures.length);
}
final CallSite callSite;
if (ref.needsBridges()) {
callSite = LambdaMetafactory.altMetafactory(lookup, ref.invokedName, ref.invokedType, ref.samMethodType, ref.implMethod, ref.samMethodType, LambdaMetafactory.FLAG_BRIDGES, 1, ref.interfaceMethodType);
} else {
callSite = LambdaMetafactory.altMetafactory(lookup, ref.invokedName, ref.invokedType, ref.samMethodType, ref.implMethod, ref.samMethodType, 0);
}
return callSite.dynamicInvoker().asType(MethodType.methodType(clazz.clazz, captures));
}
use of java.lang.invoke.CallSite in project elasticsearch by elastic.
the class Def method lookupMethod.
/**
* Looks up handle for a dynamic method call, with lambda replacement
* <p>
* A dynamic method call for variable {@code x} of type {@code def} looks like:
* {@code x.method(args...)}
* <p>
* This method traverses {@code recieverClass}'s class hierarchy (including interfaces)
* until it finds a matching whitelisted method. If one is not found, it throws an exception.
* Otherwise it returns a handle to the matching method.
* <p>
* @param lookup caller's lookup
* @param callSiteType callsite's type
* @param receiverClass Class of the object to invoke the method on.
* @param name Name of the method.
* @param args bootstrap args passed to callsite
* @return pointer to matching method to invoke. never returns null.
* @throws IllegalArgumentException if no matching whitelisted method was found.
* @throws Throwable if a method reference cannot be converted to an functional interface
*/
static MethodHandle lookupMethod(Lookup lookup, MethodType callSiteType, Class<?> receiverClass, String name, Object[] args) throws Throwable {
String recipeString = (String) args[0];
int numArguments = callSiteType.parameterCount();
// simple case: no lambdas
if (recipeString.isEmpty()) {
return lookupMethodInternal(receiverClass, name, numArguments - 1).handle;
}
// convert recipe string to a bitset for convenience (the code below should be refactored...)
BitSet lambdaArgs = new BitSet();
for (int i = 0; i < recipeString.length(); i++) {
lambdaArgs.set(recipeString.charAt(i));
}
// otherwise: first we have to compute the "real" arity. This is because we have extra arguments:
// e.g. f(a, g(x), b, h(y), i()) looks like f(a, g, x, b, h, y, i).
int arity = callSiteType.parameterCount() - 1;
int upTo = 1;
for (int i = 1; i < numArguments; i++) {
if (lambdaArgs.get(i - 1)) {
String signature = (String) args[upTo++];
int numCaptures = Integer.parseInt(signature.substring(signature.indexOf(',') + 1));
arity -= numCaptures;
}
}
// lookup the method with the proper arity, then we know everything (e.g. interface types of parameters).
// based on these we can finally link any remaining lambdas that were deferred.
Method method = lookupMethodInternal(receiverClass, name, arity);
MethodHandle handle = method.handle;
int replaced = 0;
upTo = 1;
for (int i = 1; i < numArguments; i++) {
// its a functional reference, replace the argument with an impl
if (lambdaArgs.get(i - 1)) {
// decode signature of form 'type.call,2'
String signature = (String) args[upTo++];
int separator = signature.lastIndexOf('.');
int separator2 = signature.indexOf(',');
String type = signature.substring(1, separator);
String call = signature.substring(separator + 1, separator2);
int numCaptures = Integer.parseInt(signature.substring(separator2 + 1));
Class<?>[] captures = new Class<?>[numCaptures];
for (int capture = 0; capture < captures.length; capture++) {
captures[capture] = callSiteType.parameterType(i + 1 + capture);
}
MethodHandle filter;
Definition.Type interfaceType = method.arguments.get(i - 1 - replaced);
if (signature.charAt(0) == 'S') {
// the implementation is strongly typed, now that we know the interface type,
// we have everything.
filter = lookupReferenceInternal(lookup, interfaceType, type, call, captures);
} else if (signature.charAt(0) == 'D') {
// the interface type is now known, but we need to get the implementation.
// this is dynamically based on the receiver type (and cached separately, underneath
// this cache). It won't blow up since we never nest here (just references)
MethodType nestedType = MethodType.methodType(interfaceType.clazz, captures);
CallSite nested = DefBootstrap.bootstrap(lookup, call, nestedType, 0, DefBootstrap.REFERENCE, interfaceType.name);
filter = nested.dynamicInvoker();
} else {
throw new AssertionError();
}
// the filter now ignores the signature (placeholder) on the stack
filter = MethodHandles.dropArguments(filter, 0, String.class);
handle = MethodHandles.collectArguments(handle, i, filter);
i += numCaptures;
replaced += numCaptures;
}
}
return handle;
}
use of java.lang.invoke.CallSite in project elasticsearch by elastic.
the class DefBootstrapTests method testOneType.
/** calls toString() on integers, twice */
public void testOneType() throws Throwable {
CallSite site = DefBootstrap.bootstrap(MethodHandles.publicLookup(), "toString", MethodType.methodType(String.class, Object.class), 0, DefBootstrap.METHOD_CALL, "");
MethodHandle handle = site.dynamicInvoker();
assertDepthEquals(site, 0);
// invoke with integer, needs lookup
assertEquals("5", (String) handle.invokeExact((Object) 5));
assertDepthEquals(site, 1);
// invoked with integer again: should be cached
assertEquals("6", (String) handle.invokeExact((Object) 6));
assertDepthEquals(site, 1);
}
use of java.lang.invoke.CallSite in project elasticsearch by elastic.
the class DefBootstrapTests method testTooManyTypes.
public void testTooManyTypes() throws Throwable {
// if this changes, test must be rewritten
assertEquals(5, DefBootstrap.PIC.MAX_DEPTH);
CallSite site = DefBootstrap.bootstrap(MethodHandles.publicLookup(), "toString", MethodType.methodType(String.class, Object.class), 0, DefBootstrap.METHOD_CALL, "");
MethodHandle handle = site.dynamicInvoker();
assertDepthEquals(site, 0);
assertEquals("5", (String) handle.invokeExact((Object) 5));
assertDepthEquals(site, 1);
assertEquals("1.5", (String) handle.invokeExact((Object) 1.5f));
assertDepthEquals(site, 2);
assertEquals("6", (String) handle.invokeExact((Object) 6L));
assertDepthEquals(site, 3);
assertEquals("3.2", (String) handle.invokeExact((Object) 3.2d));
assertDepthEquals(site, 4);
assertEquals("foo", (String) handle.invokeExact((Object) "foo"));
assertDepthEquals(site, 5);
assertEquals("c", (String) handle.invokeExact((Object) 'c'));
assertDepthEquals(site, 5);
}
use of java.lang.invoke.CallSite in project jdk8u_jdk by JetBrains.
the class SerializedLambdaTest method testDirectStdNonser.
// standard MF: nonserializable supertype
public void testDirectStdNonser() throws Throwable {
MethodHandle fooMH = MethodHandles.lookup().findStatic(SerializedLambdaTest.class, "foo", predicateMT);
// Standard metafactory, non-serializable target: not serializable
CallSite cs = LambdaMetafactory.metafactory(MethodHandles.lookup(), "test", MethodType.methodType(Predicate.class), predicateMT, fooMH, stringPredicateMT);
Predicate<String> p = (Predicate<String>) cs.getTarget().invokeExact();
assertNotSerial(p, fooAsserter);
}
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