Examples of org.apache.bcel.util.InstructionFinder.search()

Class org.apache.bcel.util.InstructionFinder

Examples of org.apache.bcel.util.InstructionFinder.search()

org.apache.bcel.util.InstructionFinder.search()
Search for the given pattern in the instruction list. You can search for any valid opcode via its symbolic name, e.g. "istore". You can also use a super class or an interface name to match a whole set of instructions, e.g. "BranchInstruction" or "LoadInstruction". "istore" is also an alias for all "istore_x" instructions. Additional aliases are "if" for "ifxx", "if_icmp" for "if_icmpxx", "if_acmp" for "if_acmpxx". Consecutive instruction names must be separated by white space which will be removed during the compilation of the pattern. For the rest the usual pattern matching rules for regular expressions apply.
Example pattern:
```
 search("BranchInstruction NOP ((IfInstruction|GOTO)+ ISTORE Instruction)*"); 
```
If you alter the instruction list upon a match such that other matching areas are affected, you should call reread() to update the finder and call search() again, because the matches are cached. @param pattern the instruction pattern to search for, where case is ignored @param from where to start the search in the instruction list @param constraint optional CodeConstraint to check the found code pattern for user-defined constraints @return iterator of matches where e.nextElement() returns an array ofinstruction handles describing the matched area

    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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    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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    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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    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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    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

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        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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    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

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        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 );
    }
  }

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    AccessMethodConstraint constraint = new AccessMethodConstraint(cpoolgen, verbose);
    String pattern = "ALOAD GETFIELD INVOKESTATIC+";
    
    InstructionList list = gmethod.getInstructionList();
    InstructionFinder finder = new InstructionFinder(list);
    for (Iterator i = finder.search(pattern, constraint); i.hasNext(); ) {
      InstructionHandle[] match = (InstructionHandle[])i.next();
      if (match.length > 3) throw new CantInstrumentException(
          "Can't instrument multiply nested triggers.");
      INVOKESTATIC is = (INVOKESTATIC)(match[match.length-1].getInstruction());
      String accessMethodName = is.getMethodName(cpoolgen);

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  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]);
                }

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