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

          String lvtname = ((ConstantUtf8) cp.getConstant(lvt.getNameIndex())).getBytes();
          if (! lvtname.equals("LocalVariableTable")){
            throw new ClassConstraintException("The LocalVariableTable attribute '"+tostring(lvt)+"' is not correctly named 'LocalVariableTable' but '"+lvtname+"'.");
          }


          Code code = obj;


          //In JustIce, the check for correct offsets into the code array is delayed to Pass 3a.
          LocalVariable[] localvariables = lvt.getLocalVariableTable();


          for (int i=0; i<localvariables.length; i++){
            checkIndex(lvt, localvariables[i].getNameIndex(), CONST_Utf8);
            String localname = ((ConstantUtf8) cp.getConstant(localvariables[i].getNameIndex())).getBytes();
            if (!validJavaIdentifier(localname)){
              throw new ClassConstraintException("LocalVariableTable '"+tostring(lvt)+"' references a local variable by the name '"+localname+"' which is not a legal Java simple name.");
            }


            checkIndex(lvt, localvariables[i].getSignatureIndex(), CONST_Utf8);
            String localsig  = ((ConstantUtf8) (cp.getConstant(localvariables[i].getSignatureIndex()))).getBytes(); // Local signature(=descriptor)
            Type t;
            try{
              t = Type.getType(localsig);
            }
            catch (ClassFormatException cfe){
              throw new ClassConstraintException("Illegal descriptor (==signature) '"+localsig+"' used by LocalVariable '"+tostring(localvariables[i])+"' referenced by '"+tostring(lvt)+"'.");
            }
            int localindex = localvariables[i].getIndex();
            if ( ( (t==Type.LONG || t==Type.DOUBLE)? localindex+1:localindex) >= code.getMaxLocals()){
              throw new ClassConstraintException("LocalVariableTable attribute '"+tostring(lvt)+"' references a LocalVariable '"+tostring(localvariables[i])+"' with an index that exceeds the surrounding Code attribute's max_locals value of '"+code.getMaxLocals()+"'.");
            }


            try{
              localVariablesInfos[method_number].add(localindex, localname, localvariables[i].getStartPC(), localvariables[i].getLength(), t);
            }

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                + "</A></H4>");
        /* Handle different attributes
         */
        switch (tag) {
            case ATTR_CODE:
                Code c = (Code) attribute;
                // Some directly printable values
                file.print("<UL><LI>Maximum stack size = " + c.getMaxStack()
                        + "</LI>\n<LI>Number of local variables = " + c.getMaxLocals()
                        + "</LI>\n<LI><A HREF=\"" + class_name + "_code.html#method"
                        + method_number + "\" TARGET=Code>Byte code</A></LI></UL>\n");
                // Get handled exceptions and list them
                CodeException[] ce = c.getExceptionTable();
                int len = ce.length;
                if (len > 0) {
                    file.print("<P><B>Exceptions handled</B><UL>");
                    for (int i = 0; i < len; i++) {
                        int catch_type = ce[i].getCatchType(); // Index in constant pool

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        @Override
        public @CheckForNull JumpInfo analyze(IAnalysisCache analysisCache, MethodDescriptor descriptor) throws CheckedAnalysisException {
            Method method = analysisCache.getMethodAnalysis(Method.class, descriptor);
            JavaClass jclass = getJavaClass(analysisCache, descriptor.getClassDescriptor());
            Code code = method.getCode();
            if (code == null) {
                return null;
            }


            JumpStackComputation branchAnalysis = new JumpStackComputation(descriptor);

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    public int resetForMethodEntry(final DismantleBytecode visitor) {
        this.v = visitor;
        initialize();


        int result = resetForMethodEntry0(v);
        Code code = v.getMethod().getCode();
        if (code == null) {
            return result;
        }
        JumpInfo jump = null;
        if (useIterativeAnalysis) {

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        clearJumpInfoChangedByBackwardsBranch();


        setReachOnlyByBranch(false);
        seenTransferOfControl = false;
        exceptionHandlers.clear();
        Code code = m.getCode();
        if (code != null) {
            CodeException[] exceptionTable = code.getExceptionTable();
            if (exceptionTable != null) {
                for (CodeException ex : exceptionTable) {
                    exceptionHandlers.set(ex.getHandlerPC());
                }
            }

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        } catch (CheckedAnalysisException e1) {
            analysisCache.getErrorLogger().logError("Unable to get method for " + descriptor, e1);
            return null;
        }


        Code code = method.getCode();
        if (code == null) {
            return null;
        }
        StackMapTable stackMapTable = getStackMapTable(code);
        if (stackMapTable == null) {

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        XMethod xmethod = XFactory.createXMethod(clazz, method);
        if (cachedBitsets().containsKey(xmethod)) {
            return cachedBitsets().get(xmethod);
        }
        Code code = method.getCode();
        if (code == null) {
            return null;
        }


        byte[] instructionList = code.getCode();


        // Create callback
        UnpackedBytecodeCallback callback = new UnpackedBytecodeCallback(instructionList.length);


        // Scan the method.

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                assert false;
                return Collections.<Integer> emptySet();
            }
            return result;
        }
        Code code = method.getCode();
        if (code == null) {
            assert false;
            return Collections.<Integer> emptySet();
        }


        byte[] instructionList = code.getCode();


        Set<Integer> result = new HashSet<Integer>();
        for (int i = 0; i < instructionList.length; i++) {
            if (checkForBranchExit(instructionList, i)) {
                result.add(i);

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            AnalysisContext.logError("Error getting jump information", e);
        }
        BitSet lineMentionedMultipleTimes = new BitSet();
        BitSet pcInFinallyBlock = new BitSet();


        Code code = method.getCode();
        if (code == null) {
            return lineMentionedMultipleTimes;
        }
        CodeException[] exceptionTable = code.getExceptionTable();
        if (exceptionTable == null || exceptionTable.length == 0) {
            return lineMentionedMultipleTimes;
        }
        int firstHandler = Integer.MAX_VALUE;
        for (CodeException e : exceptionTable) {

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     * Dump the disassembled code of all methods in the class.
     */
    public static void printCode(Method[] methods) {
        for (Method m : methods) {
            System.out.println(m);
            Code code = m.getCode();
            if (code != null) {
                System.out.println(code);
            }


        }

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