Examples of org.apache.bcel.classfile.Code

org.apache.bcel.classfile.Code
This class represents a chunk of Java byte code contained in a method. It is instantiated by the Attribute.readAttribute() method. A Code attribute contains informations about operand stack, local variables, byte code and the exceptions handled within this method. This attribute has attributes itself, namely LineNumberTable which is used for debugging purposes and LocalVariableTable which contains information about the local variables. @version $Id: Code.java 386056 2006-03-15 11:31:56Z tcurdt $ @author M. Dahm @see Attribute @see CodeException @see LineNumberTable @see LocalVariableTable

                result.append(n);
            }


            // Append a code.
            if (printCode) {
                Code code = m.getCode();
                // If the method is not abstract.
                if (code != null) {
                    result.append(indentString(indent * 2, "Code: "));
                    result.append(n);


                    if (verbose) {
                        result.append(indentString(indent * 3, "Max stack="));
                        result.append(code.getMaxStack());
                        result.append(", Max locals=");
                        result.append(code.getMaxLocals());
                        result.append(n);
                    }


                    // Append the code string.
                    result.append(indentString(
                            indent * 3,
                            Utility.codeToString(
                                    code.getCode(), constPool, 0, -1, verbose
                            ))
                    );
                }
            }

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                        : null, cp);
        Attribute[] attributes = m.getAttributes();
        for (int i = 0; i < attributes.length; i++) {
            Attribute a = attributes[i];
            if (a instanceof Code) {
                Code c = (Code) a;
                setMaxStack(c.getMaxStack());
                setMaxLocals(c.getMaxLocals());
                CodeException[] ces = c.getExceptionTable();
                if (ces != null) {
                    for (int j = 0; j < ces.length; j++) {
                        CodeException ce = ces[j];
                        int type = ce.getCatchType();
                        ObjectType c_type = null;
                        if (type > 0) {
                            String cen = m.getConstantPool().getConstantString(type,
                                    Constants.CONSTANT_Class);
                            c_type = new ObjectType(cen);
                        }
                        int end_pc = ce.getEndPC();
                        int length = m.getCode().getCode().length;
                        InstructionHandle end;
                        if (length == end_pc) { // May happen, because end_pc is exclusive
                            end = il.getEnd();
                        } else {
                            end = il.findHandle(end_pc);
                            end = end.getPrev(); // Make it inclusive
                        }
                        addExceptionHandler(il.findHandle(ce.getStartPC()), end, il.findHandle(ce
                                .getHandlerPC()), c_type);
                    }
                }
                Attribute[] c_attributes = c.getAttributes();
                for (int j = 0; j < c_attributes.length; j++) {
                    a = c_attributes[j];
                    if (a instanceof LineNumberTable) {
                        LineNumber[] ln = ((LineNumberTable) a).getLineNumberTable();
                        for (int k = 0; k < ln.length; k++) {

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        for (int i = 0; i < code_attrs.length; i++) {
            attrs_len += (code_attrs[i].getLength() + 6);
        }
        CodeException[] c_exc = getCodeExceptions();
        int exc_len = c_exc.length * 8; // Every entry takes 8 bytes
        Code code = null;
        if ((il != null) && !isAbstract() && !isNative()) {
            // Remove any stale code attribute
            Attribute[] attributes = getAttributes();
            for (int i = 0; i < attributes.length; i++) {
                Attribute a = attributes[i];
                if (a instanceof Code) {
                    removeAttribute(a);
                }
            }
            code = new Code(cp.addUtf8("Code"), 8 + byte_code.length + // prologue byte code
                    2 + exc_len + // exceptions
                    2 + attrs_len, // attributes
                    max_stack, max_locals, byte_code, c_exc, code_attrs, cp.getConstantPool());
            addAttribute(code);
        }

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   * @param method
   * @return
   */
  private static List<Instruction> getMethodCode(Method method) {
    final List<Instruction> ret = new ArrayList<Instruction>();
    Code code = method.getCode();
    if (code == null) {
      return ret;
    }


    byte[] bytes = code.getCode();
    String str = Utility.codeToString(bytes, code.getConstantPool(), 0,
        bytes.length);
    String[] lines = StrUtils.parse(str, "\n");
    for (int i = 0; i < lines.length; i++) {
      if (lines[i].trim().length() == 0) {
        continue;
      }
      try {
        ret.add(Instruction.parse(lines[i], code.getConstantPool(),
            code.getLocalVariableTable()));
      } catch (IllegalArgumentException exc) {
        // Catch this and continue.
      }
    }
    return ret;

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    }
    return ret;
  }


  private LineNumberTable getMethodLineNumberTable(Method method) {
    Code code = method.getCode();
    if (code == null) {
      return null;
    }


    return code.getLineNumberTable();
  }

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   * @param method
   * @return
   */
  private static List<Instruction> getMethodCode(Method method) {
    final List<Instruction> ret = new ArrayList<Instruction>();
    Code code = method.getCode();
    if (code == null) {
      return ret;
    }


    byte[] bytes = code.getCode();
    String str = Utility.codeToString(bytes, code.getConstantPool(), 0,
        bytes.length);
    String[] lines = StrUtils.parse(str, "\n");
    for (int i = 0; i < lines.length; i++) {
      if (lines[i].trim().length() == 0) {
        continue;
      }
      try {
        ret.add(Instruction.parse(lines[i], code.getConstantPool(),
            code.getLocalVariableTable()));
      } catch (IllegalArgumentException exc) {
        // Catch this and continue.
      }
    }
    return ret;

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    }
    return ret;
  }


  private LineNumberTable getMethodLineNumberTable(Method method) {
    Code code = method.getCode();
    if (code == null) {
      return null;
    }


    return code.getLineNumberTable();
  }

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      ClassRecord aClassRec, Binary aBinary, RecordTable<RecordTable<ExceptionRecord>> aExceptionTables,
      HashVector<Signature> aSignatures) throws TinyVMException
   {
      iClassRecord = aClassRec;
      iMethod = aEntry;
      Code pCodeAttrib = iMethod.getCode();
      boolean pNoBody = iMethod.isAbstract() || iMethod.isNative();
      assert pCodeAttrib != null || pNoBody: "Check: body is present";
      assert pCodeAttrib == null || !pNoBody: "Check: no body is present";
      aSignatures.addElement(aSignature);
      iSignatureId = aSignatures.indexOf(aSignature);
      if (iSignatureId >= TinyVMConstants.MAX_SIGNATURES)
      {
         throw new TinyVMException(
            "The total number of unique signatures exceeds "
               + TinyVMConstants.MAX_SIGNATURES);
      }
      iNumLocals = pCodeAttrib == null? 0 : pCodeAttrib.getMaxLocals();
      if (iNumLocals > TinyVMConstants.MAX_LOCALS)
      {
         throw new TinyVMException("Method " + aClassRec.getName() + "."
            + iMethod.getName() + " has " + iNumLocals + " local words. Only "
            + TinyVMConstants.MAX_LOCALS + " are allowed.");
      }
      iNumOperands = pCodeAttrib == null? 0 : pCodeAttrib.getMaxStack();
      if (iNumOperands > TinyVMConstants.MAX_OPERANDS)
      {
         throw new TinyVMException("Method " + aClassRec.getName() + "."
            + iMethod.getName() + " has an operand stack "
            + " whose potential size is " + iNumOperands + ". " + "Only "
            + TinyVMConstants.MAX_OPERANDS + " are allowed.");
      }
      iNumParameters = getNumParamWords(iMethod);
      if (iNumParameters > TinyVMConstants.MAX_PARAMETER_WORDS)
      {
         throw new TinyVMException("Method " + aClassRec.getName() + "."
            + iMethod.getName() + " has " + iNumParameters
            + " parameter words. Only " + TinyVMConstants.MAX_PARAMETER_WORDS
            + " are allowed.");
      }
      if (iMethod.isNative() && !aBinary.isSpecialSignature(aSignature))
      {
         throw new TinyVMException("Method " + aClassRec.getName() + "."
           + iMethod.getName() + " is an unknown native method."
           + " You are probably using JDK APIs"
            + " or libraries that cannot be run under leJOS.");
      }


      if (pCodeAttrib != null)
      {
         iExceptionTable = new RecordTable<ExceptionRecord>("exceptions", true, false);
         CodeException[] pExcepTable = pCodeAttrib.getExceptionTable();
         iNumExceptionHandlers = pExcepTable.length;
         if (iNumExceptionHandlers > TinyVMConstants.MAX_EXCEPTION_HANDLERS)
         {
            throw new TinyVMException("Method " + aClassRec.getName() + "."
               + iMethod.getName() + " has " + iNumExceptionHandlers

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   }


   public void copyCode (RecordTable<CodeSequence> aCodeSequences, JavaClass aClassFile,
      Binary aBinary)
   {
      Code pCodeAttrib = iMethod.getCode();
      if (pCodeAttrib != null)
      {
         iCodeSequence = new CodeSequence();
         copyCode(pCodeAttrib.getCode(), aClassFile, aBinary);
         aCodeSequences.add(iCodeSequence);
      }
   }

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   }


   public void postProcessCode (RecordTable<CodeSequence> aCodeSequences,
      JavaClass aClassFile, Binary aBinary) throws TinyVMException
   {
      Code pCodeAttrib = iMethod.getCode();
      if (pCodeAttrib != null)
      {
         postProcessCode(pCodeAttrib.getCode(), aClassFile, aBinary);
         iCodeStart = (iCodeSequence == null? 0 : iCodeSequence.getOffset());


      }
   }

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