/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* 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/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.opt;
import org.jikesrvm.compilers.opt.ir.OPT_IR;
/**
* Driver routine for dominator tree computation
*/
public final class OPT_DominatorTreePhase extends OPT_CompilerPhase {
/**
* Should this phase be performed?
* @param options controlling compiler options
* @return true or false
*/
public boolean shouldPerform(OPT_Options options) {
// only perform if the dominators were successfully computed and
// one of the following options are set.
return options.SSA || options.PRINT_DOMINATORS;
}
/**
* Returns "Dominator Tree"
* @return "Dominator Tree"
*/
public String getName() {
return "Dominator Tree";
}
/**
* Should the IR be printed before and/or after this phase?
* @param options controlling compiler options
* @param before query control
* @return true or false.
*/
public boolean printingEnabled(OPT_Options options, boolean before) {
return false;
}
/**
* Main driver.
*
* @param ir the governing IR
*/
public void perform(OPT_IR ir) {
// make sure the dominator computation completed successfully
if (!ir.HIRInfo.dominatorsAreComputed) {
return;
}
try {
OPT_DominatorTree.perform(ir, true);
} catch (OPT_OperationNotImplementedException e) {
if (ir.options.PRINT_DOMINATORS || ir.options.PRINT_SSA) {
OPT_Compiler.report(e.getMessage());
}
}
}
}