001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.compilers.opt.bc2ir;
014    
015    import org.jikesrvm.compilers.opt.ir.BasicBlock;
016    
017    /**
018     * Extend BasicBlockLE to support inlining during IR generation.
019     */
020    final class InliningBlockLE extends BasicBlockLE {
021      final GenerationContext gc;
022      final BasicBlockLE epilogueBBLE;
023    
024      InliningBlockLE(GenerationContext c, BasicBlockLE bble) {
025        super(0);
026        gc = c;
027        epilogueBBLE = bble;
028      }
029    
030      @Override
031      public String toString() {
032        return "(Inline method " + gc.method + ")";
033      }
034    
035      /**
036       * delete the outgoing CFG edges from all
037       * basic blocks in the callee (gc.cfg).
038       * This is used when the BBLE preceeding the inlined
039       * method block needs to be regenerated, thus forcing
040       * us to discard the callee IR (which may contains
041       * control flow links to the caller IR because of exception handlers).
042       * <p>
043       * TODO: One might be able to do this more efficiently by
044       * keeping track of the exposed edges in the generation context
045       * and commiting them once the top level generation
046       * completes.  Probably not worth it, since we expect this
047       * method to be called very infrequently.
048       */
049      void deleteAllOutEdges() {
050        for (BasicBlock bb = gc.cfg.firstInCodeOrder(); bb != null; bb = bb.nextBasicBlockInCodeOrder()) {
051          bb.deleteOut();
052        }
053      }
054    }