/*
* 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.Definition.Type;
import org.elasticsearch.painless.Globals;
import org.elasticsearch.painless.Locals;
import org.elasticsearch.painless.Locals.Variable;
import org.elasticsearch.painless.Location;
import org.elasticsearch.painless.MethodWriter;
import org.objectweb.asm.Opcodes;
import java.util.Objects;
import java.util.Set;
/**
* Represents a single variable declaration.
*/
public final class SDeclaration extends AStatement {
private final String type;
private final String name;
private AExpression expression;
private Variable variable = null;
public SDeclaration(Location location, String type, String name, AExpression expression) {
super(location);
this.type = Objects.requireNonNull(type);
this.name = Objects.requireNonNull(name);
this.expression = expression;
}
@Override
void extractVariables(Set<String> variables) {
variables.add(name);
if (expression != null) {
expression.extractVariables(variables);
}
}
@Override
void analyze(Locals locals) {
final Type type;
try {
type = locals.getDefinition().getType(this.type);
} catch (IllegalArgumentException exception) {
throw createError(new IllegalArgumentException("Not a type [" + this.type + "]."));
}
if (expression != null) {
expression.expected = type;
expression.analyze(locals);
expression = expression.cast(locals);
}
variable = locals.addVariable(location, type, name, false);
}
@Override
void write(MethodWriter writer, Globals globals) {
writer.writeStatementOffset(location);
if (expression == null) {
switch (variable.type.sort) {
case VOID: throw createError(new IllegalStateException("Illegal tree structure."));
case BOOL:
case BYTE:
case SHORT:
case CHAR:
case INT: writer.push(0); break;
case LONG: writer.push(0L); break;
case FLOAT: writer.push(0.0F); break;
case DOUBLE: writer.push(0.0); break;
default: writer.visitInsn(Opcodes.ACONST_NULL);
}
} else {
expression.write(writer, globals);
}
writer.visitVarInsn(variable.type.type.getOpcode(Opcodes.ISTORE), variable.getSlot());
}
@Override
public String toString() {
if (expression == null) {
return singleLineToString(type, name);
}
return singleLineToString(type, name, expression);
}
}