org.mvel2.asm.MethodWriter java code examples

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private void myMethod () {
 Charset c =String charsetName;Charset.forName(charsetName)
Charset.defaultCharset()
ContentType contentType;contentType.getCharset()
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}

@Override
public final MethodVisitor visitMethod(final int access, final String name,
    final String desc, final String signature, final String[] exceptions) {
  return new MethodWriter(this, access, name, desc, signature,
      exceptions, compute);
}

private void visitSwitchInsn(final Label dflt, final Label[] labels) {
  // Label currentBlock = this.currentBlock;
  if (currentBlock != null) {
    if (compute == FRAMES) {
      currentBlock.frame.execute(Opcodes.LOOKUPSWITCH, 0, null, null);
      // adds current ast successors
      addSuccessor(Edge.NORMAL, dflt);
      dflt.getFirst().status |= Label.TARGET;
      for (int i = 0; i < labels.length; ++i) {
        addSuccessor(Edge.NORMAL, labels[i]);
        labels[i].getFirst().status |= Label.TARGET;
      }
    }
    else {
      // updates current stack size (max stack size unchanged)
      --stackSize;
      // adds current ast successors
      addSuccessor(stackSize, dflt);
      for (int i = 0; i < labels.length; ++i) {
        addSuccessor(stackSize, labels[i]);
      }
    }
    // ends current ast
    noSuccessor();
  }
}

int frameIndex = startFrame(f.owner.position, nLocal, nStack);
for (i = 0; nLocal > 0; ++i, --nLocal) {
  t = locals[i];
endFrame();

    currentBlock.frame.initInputFrame(cw, access,
        Type.getArgumentTypes(descriptor), nLocal);
    visitImplicitFirstFrame();
  } else {
    if (type == Opcodes.F_NEW) {
    visitFrame(currentBlock.frame);
    visitImplicitFirstFrame();
  int frameIndex = startFrame(code.length, nLocal, nStack);
  for (int i = 0; i < nLocal; ++i) {
    if (local[i] instanceof String) {
  endFrame();
} else {
  int delta;
    stackMap.putByte(FULL_FRAME).putShort(delta).putShort(nLocal);
    for (int i = 0; i < nLocal; ++i) {
      writeFrameType(local[i]);
      writeFrameType(stack[i]);
    stackMap.putByte(SAME_FRAME_EXTENDED + nLocal).putShort(delta);
    for (int i = 0; i < nLocal; ++i) {
      writeFrameType(local[i]);
    writeFrameType(stack[0]);

Type[] args = Type.getArgumentTypes(descriptor);
f.initInputFrame(cw, access, args, this.maxLocals);
visitFrame(f);
  f = l.frame;
  if ((l.status & Label.STORE) != 0) {
    visitFrame(f);
      startFrame(start, 0, 1);
      frame[frameIndex++] = Frame.OBJECT
          | cw.addType("java/lang/Throwable");
      endFrame();
  findSubroutine(labels, id);
        findSubroutine(subroutine, id);
  findSubroutineSuccessors(0x1000, new Label[10], 0);

addSuccessor(Edge.NORMAL, label);
if (opcode != Opcodes.GOTO) {
  jsr = true;
  currentBlock.status |= Label.JSR;
  addSuccessor(stackSize + 1, label);
  addSuccessor(stackSize, label);
visitLabel(nextInsn);
noSuccessor();

    label = u + readUnsignedShort(b, u + 1);
    label = u + readShort(b, u + 1);
  newOffset = getNewOffset(allIndexes, allSizes, u, label);
  if (newOffset < Short.MIN_VALUE
      || newOffset > Short.MAX_VALUE) {
    newOffset = getNewOffset(allIndexes, allSizes, 0, u);
    insert = -(newOffset & 3);
  u += 4 * (readInt(b, u + 8) - readInt(b, u + 4) + 1) + 12;
  break;
case ClassWriter.LOOK_INSN:
  if (state == 1) {
    newOffset = getNewOffset(allIndexes, allSizes, 0, u);
    insert = -(newOffset & 3);
  u += 8 * readInt(b, u + 4) + 8;
  break;
case ClassWriter.WIDE_INSN:
  label = u + readUnsignedShort(b, u + 1);
  label = u + readShort(b, u + 1);
newOffset = getNewOffset(allIndexes, allSizes, u, label);
if (resize[u]) {

startFrame(code.length, nLocal, nStack);
for (int i = 0; i < nLocal; ++i) {
  if (local[i] instanceof String) {
endFrame();
        .putShort(nLocal);
    for (int i = 0; i < nLocal; ++i) {
      writeFrameType(local[i]);
      writeFrameType(stack[i]);
        .putShort(delta);
    for (int i = 0; i < nLocal; ++i) {
      writeFrameType(local[i]);
          .putShort(delta);
    writeFrameType(stack[0]);
    break;

public void visitLookupSwitchInsn(
    final Label dflt,
    final int keys[],
    final Label labels[]) {
  // adds the instruction to the bytecode of the method
  int source = code.length;
  code.putByte(Opcodes.LOOKUPSWITCH);
  code.length += (4 - code.length % 4) % 4;
  dflt.put(this, code, source, true);
  code.putInt(labels.length);
  for (int i = 0; i < labels.length; ++i) {
    code.putInt(keys[i]);
    labels[i].put(this, code, source, true);
  }
  // updates currentBlock
  visitSwitchInsn(dflt, labels);
}

f.initInputFrame(cw, access, Type.getArgumentTypes(descriptor),
    this.maxLocals);
visitFrame(f);
  f = l.frame;
  if ((l.status & Label.STORE) != 0) {
    visitFrame(f);
      int frameIndex = startFrame(start, 0, 1);
      frame[frameIndex] = Frame.OBJECT
          | cw.addType("java/lang/Throwable");
      endFrame();

    noSuccessor();
visitLabel(new Label());

addSuccessorToCurrentBasicBlock(Edge.JUMP, label);
if (baseOpcode != Opcodes.GOTO) {
 addSuccessorToCurrentBasicBlock(relativeStackSize + 1, label);
 addSuccessorToCurrentBasicBlock(relativeStackSize, label);
 nextBasicBlock.flags |= Label.FLAG_JUMP_TARGET;
visitLabel(nextBasicBlock);
endCurrentBasicBlockWithNoSuccessor();

while (mb != null) {
  ++nbMethods;
  size += mb.getSize();
  mb = mb.next;
mb = firstMethod;
while (mb != null) {
  mb.put(out);
  mb = mb.next;

int size = getArgumentsAndReturnSizes(descriptor) >> 2;
if ((access & Opcodes.ACC_STATIC) != 0) {
  --size;
visitLabel(labels);

  endCurrentBasicBlockWithNoSuccessor();
 } else { // xLOAD or xSTORE
  int size = relativeStackSize + STACK_SIZE_DELTA[opcode];
visitLabel(new Label());

visitLabel(labels);

public void visitInsn(final int opcode) {
  // adds the instruction to the bytecode of the method
  code.putByte(opcode);
  // update currentBlock
  // Label currentBlock = this.currentBlock;
  if (currentBlock != null) {
    if (compute == FRAMES) {
      currentBlock.frame.execute(opcode, 0, null, null);
    }
    else {
      // updates current and max stack sizes
      int size = stackSize + Frame.SIZE[opcode];
      if (size > maxStackSize) {
        maxStackSize = size;
      }
      stackSize = size;
    }
    // if opcode == ATHROW or xRETURN, ends current ast (no successor)
    if ((opcode >= Opcodes.IRETURN && opcode <= Opcodes.RETURN)
        || opcode == Opcodes.ATHROW) {
      noSuccessor();
    }
  }
}

addSuccessor(Edge.NORMAL, label);
addSuccessor(stackSize, label);

addSuccessor(Edge.NORMAL, label);
if (opcode != Opcodes.GOTO) {
  addSuccessor(stackSize + 1, label);
  addSuccessor(stackSize, label);
visitLabel(nextInsn);
noSuccessor();

public void visitTableSwitchInsn(
    final int min,
    final int max,
    final Label dflt,
    final Label labels[]) {
  // adds the instruction to the bytecode of the method
  int source = code.length;
  code.putByte(Opcodes.TABLESWITCH);
  code.length += (4 - code.length % 4) % 4;
  dflt.put(this, code, source, true);
  code.putInt(min).putInt(max);
  for (int i = 0; i < labels.length; ++i) {
    labels[i].put(this, code, source, true);
  }
  // updates currentBlock
  visitSwitchInsn(dflt, labels);
}

Javadoc

A MethodVisitor that generates a corresponding 'method_info' structure, as defined in the Java Virtual Machine Specification (JVMS).

Most used methods

<init>
Constructs a new MethodWriter.
visitLabel
visitSwitchInsn
addSuccessor
Adds a successor to the #currentBlock ast.
endFrame
Checks if the visit of the current frame #frame is finished, and if yes, write it in the StackMapTab
getSize
Returns the size of the bytecode of this method.
noSuccessor
Ends the current basic ast. This method must be used in the case where the current basic ast does no
put
Puts the bytecode of this method in the given byte vector.
startFrame
Starts the visit of a stack map frame.
visitFrame
Visits a frame that has been computed from scratch.
writeFrame
Compress and writes the current frame #frame in the StackMapTable attribute.
writeFrameType

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How to useMethodWriter in org.mvel2.asm

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