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

  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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                // 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()) &&

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            }
        }


        // 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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     */
    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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                    InstructionList il = gen.getInstructionList();
                    if (il == null) {
                        continue;
                    }
                    InstructionFinder f = new InstructionFinder(il);
                    Iterator e = f.search("GETSTATIC GETFIELD ISTORE (GETSTATIC GETFIELD BIPUSH ISHR GETSTATIC IADD ISTORE)+");
                    if (e.hasNext()) {
                        InstructionHandle[] handles = (InstructionHandle[]) e.next();
                        String myplayer = ((GETSTATIC) handles[0].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC) handles[0].getInstruction()).getFieldName(cpg);
                        String animable = ((GETFIELD) handles[1].getInstruction()).getClassName(cpg);
                        String plane = ((GETFIELD) handles[1].getInstruction()).getFieldName(cpg);

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                            ConstantPoolGen cpg = c.getValue().getConstantPool();
                            MethodGen gen = new MethodGen(m,c.getValue().getClassName(),cpg);
                            InstructionList il = gen.getInstructionList();
                            if (il == null) continue;
                            InstructionFinder f = new InstructionFinder(il);
                            Iterator e = f.search("GETSTATIC GETSTATIC AALOAD ILOAD AALOAD ILOAD BALOAD ICONST IAND");
                            if (e.hasNext()) {
                              InstructionHandle[] handles = (InstructionHandle[]) e.next();
                                String gba = ((GETSTATIC)handles[0].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC)handles[0].getInstruction()).getFieldName(cpg);
                                data.addField("GroundSettingsArray", gba);
                                e = f.search("GETSTATIC (ICONST)+ GETSTATIC IADD AALOAD");

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                            Iterator e = f.search("GETSTATIC GETSTATIC AALOAD ILOAD AALOAD ILOAD BALOAD ICONST IAND");
                            if (e.hasNext()) {
                              InstructionHandle[] handles = (InstructionHandle[]) e.next();
                                String gba = ((GETSTATIC)handles[0].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC)handles[0].getInstruction()).getFieldName(cpg);
                                data.addField("GroundSettingsArray", gba);
                                e = f.search("GETSTATIC (ICONST)+ GETSTATIC IADD AALOAD");
                                //System.out.println("Found method. Class: "+c.getValue().getClassName() + ", method: "+m.getName());
                                if (e.hasNext()) {
                                    handles = (InstructionHandle[]) e.next();
                                    String planearray = ((GETSTATIC)handles[0].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC)handles[0].getInstruction()).getFieldName(cpg);
                                    String curplane = ((GETSTATIC)handles[2].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC)handles[2].getInstruction()).getFieldName(cpg);

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                    ConstantPoolGen cpg = c.getValue().getConstantPool();
                    MethodGen gen = new MethodGen(m,c.getValue().getClassName(),cpg);
                    InstructionList il = gen.getInstructionList();
                    if (il == null) continue;
                    InstructionFinder f = new InstructionFinder(il);
                    Iterator e = f.search("BASTORE GETSTATIC ILOAD ILOAD ILOAD ILOAD INVOKEVIRTUAL");
                    if (e.hasNext()) {
                        InstructionHandle[] handles = (InstructionHandle[]) e.next();
                        String curtoolkit = ((GETSTATIC)handles[1].getInstruction()).getClassName(cpg) + "." + ((GETSTATIC)handles[1].getInstruction()).getFieldName(cpg);
                        String toolkit = ((GETSTATIC)handles[1].getInstruction()).getSignature(cpg).replaceAll("L|;","");
                        data.addClass("Toolkit", toolkit);

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                        if(count==7){
                          fi = iS.nextGETSTATIC();
                          sDestX = fi.getClassName(cpg)+'.'+fi.getFieldName(cpg);
                          data.addField("DestX", sDestX);
                          InstructionFinder f = new InstructionFinder(il);
                          Iterator e = f.search("IF_ICMPNE ICONST_M1 PUTSTATIC ICONST_M1 PUTSTATIC");
                              if(e.hasNext()){
                                InstructionHandle[] handles = (InstructionHandle[]) e.next();
                                String temp = ((FieldInstruction) ((PUTSTATIC) handles[2].getInstruction())).getClassName(cpg) + "." + ((PUTSTATIC) handles[2].getInstruction()).getFieldName(cpg);
                                if(!temp.equals(sDestX)){
                                  data.addField("DestY", temp);

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