| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.sysds.hops.ipa; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Map.Entry; |
| |
| import org.apache.sysds.hops.HopsException; |
| import org.apache.sysds.parser.DMLProgram; |
| import org.apache.sysds.parser.FunctionStatementBlock; |
| import org.apache.sysds.parser.LanguageException; |
| |
| /** |
| * This rewrite identifies and removes unused functions in order |
| * to reduce compilation overhead and other overheads such as |
| * parfor worker creation, where we construct function copies. |
| * |
| */ |
| public class IPAPassRemoveUnusedFunctions extends IPAPass |
| { |
| @Override |
| public boolean isApplicable(FunctionCallGraph fgraph) { |
| return InterProceduralAnalysis.REMOVE_UNUSED_FUNCTIONS |
| && !fgraph.containsSecondOrderCall(); |
| } |
| |
| @Override |
| public void rewriteProgram( DMLProgram prog, FunctionCallGraph fgraph, FunctionCallSizeInfo fcallSizes ) { |
| try { |
| Set<String> fnamespaces = prog.getNamespaces().keySet(); |
| for( String fnspace : fnamespaces ) { |
| Map<String, FunctionStatementBlock> fsbs = prog.getFunctionStatementBlocks(fnspace); |
| Iterator<Entry<String, FunctionStatementBlock>> iter = fsbs.entrySet().iterator(); |
| while( iter.hasNext() ) { |
| Entry<String, FunctionStatementBlock> e = iter.next(); |
| if( !fgraph.isReachableFunction(fnspace, e.getKey()) ) { |
| iter.remove(); |
| if( LOG.isDebugEnabled() ) |
| LOG.debug("IPA: Removed unused function: " + |
| DMLProgram.constructFunctionKey(fnspace, e.getKey())); |
| } |
| } |
| } |
| } |
| catch(LanguageException ex) { |
| throw new HopsException(ex); |
| } |
| } |
| } |