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Optimisation of Java Bytecode via EOLANG
/*
* The MIT License (MIT)
*
* Copyright (c) 2016-2023 Objectionary.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.eolang.jeo.representation.directives;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Random;
import java.util.concurrent.atomic.AtomicReference;
import org.eolang.jeo.representation.MethodName;
import org.xembly.Directive;
import org.xembly.Directives;
/**
* Directives Method.
* @since 0.1
* @todo #534:90min Refactor DirectivesMethod class to simplify the code.
* Currently, the class has a lot of methods and fields. It's kind of hard to understand
* what this class does. We need to refactor it to make it more readable and understandable.
* Moreover, in many places this class uses null checks, which is not good.
*/
public final class DirectivesMethod implements Iterable {
/**
* Method name.
*/
private final MethodName name;
/**
* Method properties.
*/
private final DirectivesMethodProperties properties;
/**
* Method instructions.
*/
private final List> instructions;
/**
* Method exceptions.
*/
private final List> exceptions;
/**
* Method annotations.
*/
private final DirectivesAnnotations annotations;
/**
* Annotation default value.
*/
private final AtomicReference dvalue;
/**
* Opcodes counting.
*/
private final boolean counting;
/**
* Constructor.
*/
public DirectivesMethod() {
this("testMethod");
}
/**
* Constructor.
* @param name Method name
*/
public DirectivesMethod(final String name) {
this(name, new DirectivesMethodProperties());
}
/**
* Constructor.
* @param name Method name
* @param properties Method properties
*/
public DirectivesMethod(final String name, final DirectivesMethodProperties properties) {
this(name, true, properties);
}
/**
* Constructor.
* @param name Method name
* @param counting Opcodes counting
* @param properties Method properties
*/
public DirectivesMethod(
final String name,
final boolean counting,
final DirectivesMethodProperties properties
) {
this.name = new MethodName(name, properties.descr());
this.properties = properties;
this.counting = counting;
this.instructions = new ArrayList<>(0);
this.exceptions = new ArrayList<>(0);
this.annotations = new DirectivesAnnotations();
this.dvalue = new AtomicReference<>();
}
/**
* Add opcode to the directives.
* @param opcode Opcode
* @param operands Operands
* @return This object
*/
public DirectivesMethod opcode(final int opcode, final Object... operands) {
this.instructions.add(new DirectivesInstruction(opcode, this.counting, operands));
return this;
}
/**
* Add operand to the directives.
* @param directives Operand directives.
*/
public void operand(final Iterable directives) {
this.instructions.add(directives);
}
/**
* Add maxs to the directives.
* @param stack Max stack size
* @param locals Max locals size
*/
public void maxs(final int stack, final int locals) {
this.properties.maxs(stack, locals);
}
/**
* Add annotation to the directives.
* @param annotation Annotation directives.
* @return This object.
*/
public DirectivesMethod annotation(final DirectivesAnnotation annotation) {
this.annotations.add(annotation);
return this;
}
@Override
public Iterator iterator() {
final Directives directives = new Directives();
directives.add("o")
.attr("abstract", "")
.attr("name", this.name.encoded())
.append(this.properties)
.append(this.annotations)
.add("o")
.attr("base", "seq")
.attr("name", "@")
.add("o")
.attr("base", "tuple")
.attr("name", "instructions")
.attr("line", new Random().nextInt(Integer.MAX_VALUE))
.attr("star", "");
this.instructions.forEach(directives::append);
directives.up();
directives.up();
if (!this.exceptions.isEmpty()) {
directives.add("o")
.attr("base", "tuple")
.attr("star", "")
.attr("name", String.format("trycatchblocks-%s", this.name.decoded()));
this.exceptions.forEach(directives::append);
directives.up();
}
if (Objects.nonNull(this.dvalue)
&& this.dvalue.get() != null
&& !this.dvalue.get().isEmpty()
) {
directives.append(this.dvalue.get());
}
directives.up();
return directives.iterator();
}
/**
* Add exception to the directives.
* @param exception Exception directives.
*/
void exception(final Iterable exception) {
this.exceptions.add(exception);
}
/**
* Add annotation default value to the directives.
* @param value Default value directives.
*/
void defvalue(final DirectivesDefaultValue value) {
this.dvalue.set(value);
}
/**
* Set parameter annotation.
* @param parameter Parameter index
* @param annotation Annotation
*/
void paramAnnotation(final int parameter, final DirectivesAnnotation annotation) {
this.properties.paramAnnotation(parameter, annotation);
}
}