Source code: Compil3r/Quad/BasicBlockVisitor.java
1 // BasicBlockVisitor.java, created Fri Jan 11 16:42:38 2002 by joewhaley
2 // Copyright (C) 2001-3 John Whaley <jwhaley@alum.mit.edu>
3 // Licensed under the terms of the GNU LGPL; see COPYING for details.
4 package Compil3r.Quad;
5
6 /**
7 * Interface for the basic block visitor design pattern.
8 * Make your visitor object implement this class in order to visit
9 * @author John Whaley <jwhaley@alum.mit.edu>
10 * @see BasicBlock
11 * @version $Id: BasicBlockVisitor.java,v 1.8 2003/05/12 10:05:14 joewhaley Exp $
12 */
13 public interface BasicBlockVisitor {
14
15 /** Visit a basic block.
16 * @param bb basic block to visit */
17 void visitBasicBlock(BasicBlock bb);
18
19 /**
20 * Empty basic block visitor for easy subclassing.
21 */
22 class EmptyVisitor implements BasicBlockVisitor {
23 /** Visit a basic block.
24 * @param bb basic block to visit */
25 public void visitBasicBlock(BasicBlock bb) {}
26 }
27
28 /**
29 * Control flow graph visitor that visits all basic blocks in the CFG with a given
30 * basic block visitor.
31 * @see ControlFlowGraph
32 * @see ControlFlowGraphVisitor
33 */
34 class AllBasicBlockVisitor implements ControlFlowGraphVisitor {
35 private final BasicBlockVisitor bbv;
36 boolean trace;
37 /** Construct a new AllBasicBlockVisitor.
38 * @param bbv basic block visitor to visit each basic block with. */
39 public AllBasicBlockVisitor(BasicBlockVisitor bbv) { this.bbv = bbv; }
40 /** Construct a new AllBasicBlockVisitor and set the trace flag to be the specified value.
41 * @param bbv basic block visitor to visit each basic block with.
42 * @param trace value of the trace flag */
43 public AllBasicBlockVisitor(BasicBlockVisitor bbv, boolean trace) { this.bbv = bbv; this.trace = trace; }
44 /** Visit each of the basic blocks in the given control flow graph.
45 * @param cfg control flow graph to visit
46 */
47 public void visitCFG(ControlFlowGraph cfg) {
48 cfg.visitBasicBlocks(bbv);
49 }
50 }
51
52 }