Examples of org.apache.bcel.util.InstructionFinder

org.apache.bcel.util.InstructionFinder

ta.apache.org/regexp/"> Regexp package to search for regular expressions. A typical application would look like this:

 InstructionFinder f   = new InstructionFinder(il); String            pat = "IfInstruction ICONST_0 GOTO ICONST_1 NOP (IFEQ|IFNE)"; for(Iterator i = f.search(pat, constraint); i.hasNext(); ) { InstructionHandle[] match = (InstructionHandle[])i.next(); ... il.delete(match[1], match[5]); ... }

@version $Id: InstructionFinder.java 386056 2006-03-15 11:31:56Z tcurdt $ @author M. Dahm @see Instruction @see InstructionList

    } catch(Exception e) { e.printStackTrace(); }
  }


  private static final Method removeNOPs(MethodGen mg) {
    InstructionList   il    = mg.getInstructionList();
    InstructionFinder f     = new InstructionFinder(il);
    String            pat   = "NOP+"; // Find at least one NOP
    InstructionHandle next  = null;
    int               count = 0;


    for(Iterator e = f.search(pat); e.hasNext(); ) {
      InstructionHandle[] match = (InstructionHandle[])e.next();
      InstructionHandle   first = match[0];
      InstructionHandle   last  = match[match.length - 1];
      
      /* Some nasty Java compilers may add NOP at end of method.

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    } catch(Exception e) { e.printStackTrace(); }
  }


  private static final Method removeNOPs(MethodGen mg) {
    InstructionList   il    = mg.getInstructionList();
    InstructionFinder f     = new InstructionFinder(il);
    String            pat   = "NOP+"; // Find at least one NOP
    InstructionHandle next  = null;
    int               count = 0;


    for(Iterator i = f.search(pat); i.hasNext(); ) {
      InstructionHandle[] match = (InstructionHandle[])e.next();
      InstructionHandle   first = match[0];
      InstructionHandle   last  = match[match.length - 1];
      
      /* Some nasty Java compilers may add NOP at end of method.

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    /**
     * Peephole optimization: Remove sequences of [ALOAD, POP].
     */
    private void peepHoleOptimization(MethodGenerator methodGen) {
    InstructionList il = methodGen.getInstructionList();
    InstructionFinder find = new InstructionFinder(il);
  InstructionHandle ih;
  String pattern;


  // Remove seqences of ALOAD, POP (GTM)
  pattern = "`ALOAD'`POP'`Instruction'";
  for(Iterator iter=find.search(pattern); iter.hasNext();){
      InstructionHandle[] match = (InstructionHandle[])iter.next();
      try {
    if ((!match[0].hasTargeters()) && (!match[1].hasTargeters())) {
                    il.delete(match[0], match[1]);
                }
      }
      catch (TargetLostException e) {
                // TODO: move target down into the list
            }
  }
  // Replace sequences of ILOAD_?, ALOAD_?, SWAP with ALOAD_?, ILOAD_?
  pattern = "`ILOAD'`ALOAD'`SWAP'`Instruction'";
  for(Iterator iter=find.search(pattern); iter.hasNext();){
            InstructionHandle[] match = (InstructionHandle[])iter.next();
            try {
                org.apache.bcel.generic.Instruction iload;
                org.apache.bcel.generic.Instruction aload;
                if ((!match[0].hasTargeters()) &&
                    (!match[1].hasTargeters()) &&
                    (!match[2].hasTargeters())) {
                    iload = match[0].getInstruction();
                    aload = match[1].getInstruction();
                    il.insert(match[0], aload);
                    il.insert(match[0], iload);
                    il.delete(match[0], match[2]);
                }
            }
            catch (TargetLostException e) {
                // TODO: move target down into the list
            }
        }
        
        // Replace sequences of ALOAD_1, ALOAD_1 with ALOAD_1, DUP 
  pattern = "`ALOAD_1'`ALOAD_1'`Instruction'";
        for(Iterator iter=find.search(pattern); iter.hasNext();){
            InstructionHandle[] match = (InstructionHandle[])iter.next();
            try {
          org.apache.bcel.generic.Instruction iload;
                org.apache.bcel.generic.Instruction aload;
                if ((!match[0].hasTargeters()) && (!match[1].hasTargeters())) {

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     * Peephole optimization: Remove sequences of [ALOAD, POP].
     */
    private void peepHoleOptimization(MethodGenerator methodGen) {
  final String pattern = "`ALOAD'`POP'`Instruction'";
  final InstructionList il = methodGen.getInstructionList();
  final InstructionFinder find = new InstructionFinder(il);
  for(Iterator iter=find.search(pattern); iter.hasNext(); ) {
      InstructionHandle[] match = (InstructionHandle[])iter.next();
      try {
    il.delete(match[0], match[1]);
      } 
      catch (TargetLostException e) {

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   * 
   * @return the handle to the super/this(...) constructor call.
   */
  public InstructionHandle lookUpSuperConstructorCall() {
    // construct a finder
    InstructionFinder finder = 
      new InstructionFinder( iList );
    
    // do the search
    Iterator iter 
      = finder.search( 
        Constants.OPCODE_NAMES[Constants.INVOKESPECIAL] );
  
    if( iter.hasNext() ) {
      InstructionHandle[] ih 
        = (InstructionHandle[])iter.next();

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   * @return a list of matches
   */
  public List<CallMatch> lookUpMethodCall( Pattern invokePattern ) { 
    
    // construct a finder
    InstructionFinder finder = 
      new InstructionFinder( iList );
    
    // search all invokes 
    Iterator iter 
      = finder.search( 
        Constants.OPCODE_NAMES[Constants.INVOKEINTERFACE]
        + "|"
        + Constants.OPCODE_NAMES[Constants.INVOKESPECIAL]
        + "|"
        + Constants.OPCODE_NAMES[Constants.INVOKESTATIC]

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    int idx = 
      constPoolGen.lookupMethodref( 
        classname, name, signature );
    
    // construct a finder
    InstructionFinder finder = 
      new InstructionFinder( iList );
    
    // do the search
    Iterator iter 
      = finder.search( 
        Constants.OPCODE_NAMES[Constants.INVOKEVIRTUAL],
        new MethodCallConstraint( idx ) );
    
    // the return list
    List<InstructionHandle> rc = new ArrayList<InstructionHandle>();

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   * @return a list of return statments.
   */
  private List<InstructionHandle> lookUpReturnStatements( boolean skipLast ) {
    
    // construct a finder
    InstructionFinder finder = 
      new InstructionFinder( iList );
    
    // do the search
    Iterator iter 
      = finder.search( "IRETURN|LRETURN|FRETURN|DRETURN|ARETURN|RETURN" );
    
    List<InstructionHandle> rc = new ArrayList<InstructionHandle>();
    
    while( iter.hasNext() ) {
      InstructionHandle[] ih

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   * @return an iterator of the search-results.
   */
  private Iterator searchLoadInstruction( 
    int varIdx, String prefix, String postfix, int instructionIdx ) {


    InstructionFinder finder = 
      new InstructionFinder( iList );
  
    if( varIdx > 3 ) { // a constraint checks the variable index
      return finder.search( 
        prefix + " " +
        "ALOAD " + postfix, 
        new LoadStoreConstraint( varIdx, instructionIdx ) );
    }
    else { // the variable index is included in the instruction
      return finder.search( 
        prefix + " "  
        + new ALOAD( varIdx ).toString( false ) 
        + " " + postfix );
    }
  }

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   * @return an iterator of the search-results.
   */
  private Iterator searchStoreInstruction( 
      int varIdx, String prefix, String postfix, int instructionIdx ) {


    InstructionFinder finder = 
      new InstructionFinder( iList );
  
    if( varIdx > 3 ) {  // a constraint checks the variable index
      return finder.search( 
        prefix + " " +
        "ASTORE " + postfix, 
        new LoadStoreConstraint( varIdx, instructionIdx ) );
    }
    else { // the variable index is included in the instruction
      return finder.search( 
        prefix + " "  
        + new ASTORE( varIdx ).toString( false ) 
        + " " + postfix );
    }
  }

View Full Code Here

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