/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.painless.node;
import org.elasticsearch.painless.AnalyzerCaster;
import org.elasticsearch.painless.Definition;
import org.elasticsearch.painless.Definition.Method;
import org.elasticsearch.painless.Definition.MethodKey;
import org.elasticsearch.painless.FunctionRef;
import org.elasticsearch.painless.Globals;
import org.elasticsearch.painless.Locals;
import org.elasticsearch.painless.Location;
import org.elasticsearch.painless.MethodWriter;
import org.objectweb.asm.Type;
import java.util.Objects;
import java.util.Set;
import static org.elasticsearch.painless.Definition.VOID_TYPE;
import static org.elasticsearch.painless.WriterConstants.LAMBDA_BOOTSTRAP_HANDLE;
/**
* Represents a function reference.
*/
public final class EFunctionRef extends AExpression implements ILambda {
private final String type;
private final String call;
private FunctionRef ref;
private String defPointer;
public EFunctionRef(Location location, String type, String call) {
super(location);
this.type = Objects.requireNonNull(type);
this.call = Objects.requireNonNull(call);
}
@Override
void extractVariables(Set<String> variables) {}
@Override
void analyze(Locals locals) {
if (expected == null) {
ref = null;
actual = locals.getDefinition().getType("String");
defPointer = "S" + type + "." + call + ",0";
} else {
defPointer = null;
try {
if ("this".equals(type)) {
// user's own function
Method interfaceMethod = expected.struct.getFunctionalMethod();
if (interfaceMethod == null) {
throw new IllegalArgumentException("Cannot convert function reference [" + type + "::" + call + "] " +
"to [" + expected.name + "], not a functional interface");
}
Method delegateMethod = locals.getMethod(new MethodKey(call, interfaceMethod.arguments.size()));
if (delegateMethod == null) {
throw new IllegalArgumentException("Cannot convert function reference [" + type + "::" + call + "] " +
"to [" + expected.name + "], function not found");
}
ref = new FunctionRef(expected, interfaceMethod, delegateMethod, 0);
// check casts between the interface method and the delegate method are legal
for (int i = 0; i < interfaceMethod.arguments.size(); ++i) {
Definition.Type from = interfaceMethod.arguments.get(i);
Definition.Type to = delegateMethod.arguments.get(i);
AnalyzerCaster.getLegalCast(location, from, to, false, true);
}
if (interfaceMethod.rtn != VOID_TYPE) {
AnalyzerCaster.getLegalCast(location, delegateMethod.rtn, interfaceMethod.rtn, false, true);
}
} else {
// whitelist lookup
ref = new FunctionRef(locals.getDefinition(), expected, type, call, 0);
}
} catch (IllegalArgumentException e) {
throw createError(e);
}
actual = expected;
}
}
@Override
void write(MethodWriter writer, Globals globals) {
if (ref != null) {
writer.writeDebugInfo(location);
writer.invokeDynamic(
ref.interfaceMethodName,
ref.factoryDescriptor,
LAMBDA_BOOTSTRAP_HANDLE,
ref.interfaceType,
ref.delegateClassName,
ref.delegateInvokeType,
ref.delegateMethodName,
ref.delegateType
);
} else {
// TODO: don't do this: its just to cutover :)
writer.push((String)null);
}
}
@Override
public String getPointer() {
return defPointer;
}
@Override
public Type[] getCaptures() {
return new Type[0]; // no captures
}
@Override
public String toString() {
return singleLineToString(type, call);
}
}