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

                    InstructionList il = gen.getInstructionList();
                    if (il == null) {
                        continue;
                    }
                    InstructionFinder f = new InstructionFinder(il);
                    Iterator e = f.search("GETSTATIC GETFIELD ICONST IALOAD LDC ISHR ISTORE GETSTATIC GETFIELD ICONST IALOAD LDC");
                    if (e.hasNext()) {
                        InstructionHandle[] handles = (InstructionHandle[]) e.next();
                        String queueX = ((GETFIELD) handles[8].getInstruction()).getFieldName(cpg);
                        String queueY = ((GETFIELD) handles[1].getInstruction()).getFieldName(cpg);
                        RSClass characterClass = data.getProperClass("Character");

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              m.getArgumentTypes().length == 0){
            ConstantPoolGen cpg = c.getValue().getConstantPool();
            MethodGen mg = new MethodGen(m, c.getValue().getClassName(), cpg);
            InstructionList il = mg.getInstructionList();
            InstructionFinder f = new InstructionFinder(il);
            Iterator e = f.search("INVOKEVIRTUAL CHECKCAST GETFIELD ASTORE ALOAD GETFIELD IFEQ");
            if(e.hasNext()){
              InstructionHandle[] handles = (InstructionHandle[]) e.next();
              String getHits = ((GETFIELD) handles[5].getInstruction()).getFieldName(cpg);
              InstructionSearcher iS = new InstructionSearcher(il, cpg);
              iS.nextGETSTATIC();

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                if (il == null) {
                   continue;
                }
                InstructionFinder f = new InstructionFinder(il);
                            // ISTORE GETSTATIC ISTORE GETSTATIC
                Iterator e = f.search("GETSTATIC ISTORE GETSTATIC ICONST IADD PUTSTATIC GETSTATIC ISTORE GETSTATIC");
                if (e.hasNext()) {
                  InstructionHandle[] handles = (InstructionHandle[]) e.next();
                      String menuX = ((GETSTATIC) handles[6].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC) handles[6].getInstruction()).getFieldName(cpg);
                      String menuY = ((GETSTATIC) handles[8].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC) handles[8].getInstruction()).getFieldName(cpg);
                      data.addField("MenuX", menuX);

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  InstructionHandle ih;
  String pattern;


  // LoadInstruction, POP => (removed)
  pattern = "LoadInstruction POP";
  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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            }
  }
        
  // ILOAD_N, ILOAD_N, SWAP, ISTORE_N => ILOAD_N
  pattern = "ILOAD ILOAD SWAP ISTORE";
  for (Iterator iter = find.search(pattern); iter.hasNext();) {
            InstructionHandle[] match = (InstructionHandle[]) iter.next();
            try {              
                org.apache.bcel.generic.ILOAD iload1 = 
                    (org.apache.bcel.generic.ILOAD) match[0].getInstruction();
                org.apache.bcel.generic.ILOAD iload2 =

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            }
        }


        // LoadInstruction_N, LoadInstruction_M, SWAP => LoadInstruction_M, LoadInstruction_N
  pattern = "LoadInstruction LoadInstruction SWAP";
  for (Iterator iter = find.search(pattern); iter.hasNext();) {
            InstructionHandle[] match = (InstructionHandle[])iter.next();
            try {
                if (!match[0].hasTargeters() &&
                    !match[1].hasTargeters() &&
                    !match[2].hasTargeters())

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            }
        }
                
        // ALOAD_N ALOAD_N => ALOAD_N DUP
  pattern = "ALOAD ALOAD";
        for (Iterator iter = find.search(pattern); iter.hasNext();) {
            InstructionHandle[] match = (InstructionHandle[])iter.next();
            try {
                if (!match[1].hasTargeters()) {
                    org.apache.bcel.generic.ALOAD aload1 = 
                        (org.apache.bcel.generic.ALOAD) match[0].getInstruction();

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     */
    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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     */
    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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  InstructionHandle ih;
  String pattern;


  // LoadInstruction, POP => (removed)
  pattern = "LoadInstruction POP";
  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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