apparat.abc.optimization.IdenticalMethodRemoval.scala Maven / Gradle / Ivy

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/*
 * This file is part of Apparat.
 *
 * Apparat is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Apparat is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Apparat. If not, see .
 *
 * Copyright (C) 2009 Joa Ebert
 * http://www.joa-ebert.com/
 *
 */
package apparat.abc.optimization

import apparat.log.SimpleLog
import apparat.abc.{AbcMethodBody, AbcMethodParameter, AbcMethod, Abc}
import apparat.abc.utils.MethodMapper
import apparat.abc.analysis.IdenticalMethodsFinder

/**
 * @author Joa Ebert
 */
object IdenticalMethodRemoval extends (Abc => Boolean) with SimpleLog {
	//
	// NOTE: Removing methods causes a VerifyError in the Flash Player. Probably
	// one method body may not be referenced more than one time. However other
	// implementations like JITB might show a different behaviour.
	//

	override def apply(abc: Abc) = {
		if(true) {
			log.warning("Method merging causes a VerifyError in current Flash Player versions.")
			false
		} else {
			val map = IdenticalMethodsFinder(abc)

			log.debug("%d identical method(s) found.", map.size)

			val mapper = new MethodMapper(map)
			mapper.transform(abc)
			
			abc.methods = abc.methods filterNot { map contains _ }
			
			map.nonEmpty
		}
	}
}