/* * This file is part of the Jikes RVM project (http://jikesrvm.org). * * This file is licensed to You under the Eclipse Public License (EPL); * You may not use this file except in compliance with the License. You * may obtain a copy of the License at * * http://www.opensource.org/licenses/eclipse-1.0.php * * See the COPYRIGHT.txt file distributed with this work for information * regarding copyright ownership. */ package org.jikesrvm.compilers.opt.controlflow; import org.jikesrvm.compilers.opt.DefUse; import org.jikesrvm.compilers.opt.OptOptions; import org.jikesrvm.compilers.opt.driver.CompilerPhase; import org.jikesrvm.compilers.opt.ir.IR; /** * The driver that creates an annotated {@link AnnotatedLSTGraph}. * * @see AnnotatedLSTGraph */ public class LoopAnalysis extends CompilerPhase { /** * Return a string name for this phase. * @return "Loop Analysis" */ @Override public final String getName() { return "Loop Analysis"; } /** * This phase is disabled by default. * <p> * It will run only on O3 but O2 is the default maximum optimization level. */ @Override public boolean shouldPerform(OptOptions options) { return options.getOptLevel() >= 3; } @Override public final void perform(IR ir) { if (!ir.hasReachableExceptionHandlers()) { // Build LST tree and dominator info new DominatorsPhase(false).perform(ir); DefUse.computeDU(ir); // Build annotated version ir.HIRInfo.loopStructureTree = new AnnotatedLSTGraph(ir, ir.HIRInfo.loopStructureTree); } } }