org.objectweb.asm.MethodVisitor.visitLabel java code examples

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private void genSwitchMethod(ClassVisitor cw, String typeName, String methodName, CB callback) {
  MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, methodName, "()Ljava/lang/String;", null, null);
  mv.visitCode();
  mv.visitVarInsn(ALOAD, 0);
  mv.visitFieldInsn(GETFIELD, typeName, "idx", "I");
  Label def = new Label();
  Label[] labels = new Label[callbacks.size()];
    Label label = strMap.get(key);
    if (label == null) {
      label = new Label();
      strMap.put(key, label);
    mv.visitLabel(e.getValue());
    mv.visitLdcInsn(e.getKey());
    mv.visitInsn(ARETURN);
  mv.visitLabel(def);
  mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
  mv.visitInsn(DUP);
  mv.visitLdcInsn("invalid idx");
  mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
  mv.visitInsn(ATHROW);
  mv.visitMaxs(-1, -1);
  mv.visitEnd();

/**
 * Writes out the information stored in tags associated with the given unit
 * 
 * @param mv
 *          The method visitor for writing out the bytecode
 * @param u
 *          The unit for which to write out the tags
 */
protected void generateTagsForUnit(MethodVisitor mv, Unit u) {
 if (u.hasTag("LineNumberTag")) {
  LineNumberTag lnt = (LineNumberTag) u.getTag("LineNumberTag");
  Label l;
  if (branchTargetLabels.containsKey(u)) {
   l = branchTargetLabels.get(u);
  } else {
   l = new Label();
   mv.visitLabel(l);
  }
  mv.visitLineNumber(lnt.getLineNumber(), l);
 }
}

LabelStmt labelStmt = (LabelStmt) st;
Label label = (Label) labelStmt.tag;
asm.visitLabel(label);
if (labelStmt.lineNumber >= 0) {
  asm.visitLineNumber(labelStmt.lineNumber, label);
    String arrayElementType = tp1.substring(1);
    insertI2x(v2.valueType, arrayElementType, asm);
    asm.visitInsn(getOpcode(arrayElementType, IASTORE));
  int index = ((Local) e2.op1)._ls_index;
  if (index >= 0) {
    asm.visitVarInsn(ASTORE, index);
    asm.visitVarInsn(getOpcode(v, ISTORE), nIndex);
    lockMap.put(key, nIndex);

  case Constants.MONITORENTER:
  case Constants.MONITOREXIT:
   methodVisitor.visitInsn(opcode);
   currentOffset += 1;
   break;
  case Constants.ALOAD_3:
   opcode -= Constants.ILOAD_0;
   methodVisitor.visitVarInsn(Opcodes.ILOAD + (opcode >> 2), opcode & 0x3);
   currentOffset += 1;
   break;
  case Constants.ASTORE_3:
   opcode -= Constants.ISTORE_0;
   methodVisitor.visitVarInsn(Opcodes.ISTORE + (opcode >> 2), opcode & 0x3);
   currentOffset += 1;
   break;
    currentOffset += 6;
   } else {
    methodVisitor.visitVarInsn(opcode, readUnsignedShort(currentOffset + 2));
    currentOffset += 4;
 methodVisitor.visitLabel(labels[codeLength]);
methodVisitor.visitMaxs(maxStack, maxLocals);

@Override
public void visitCode() {
  super.visitCode();
  if (methodName.equals("<clinit>")) {
    startingTryLabel = new Label();
    endingTryLabel = new Label();
    super.visitLabel(startingTryLabel);
  }
}

@Override
protected void onMethodEnter() {
  // these classes can be initialized inside of ClassFileTransformer.transform(), via
  // Resources.toByteArray(url) inside of AnalyzedWorld.createAnalyzedClass()
  // because jboss registers org.jboss.net.protocol.URLStreamHandlerFactory to handle
  // "file" and "resource" URLs
  //
  // these classes can not be initialized in PreInitializeWeavingClasses since they are
  // not accessible from the bootstrap or system class loader, and thus, this hack
  Label l0 = new Label();
  Label l1 = new Label();
  Label l2 = new Label();
  mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Throwable");
  mv.visitLabel(l0);
  visitClassForName("org.jboss.net.protocol.file.Handler");
  visitClassForName("org.jboss.net.protocol.file.FileURLConnection");
  visitClassForName("org.jboss.net.protocol.resource.Handler");
  visitClassForName("org.jboss.net.protocol.resource.ResourceURLConnection");
  mv.visitLabel(l1);
  Label l3 = new Label();
  mv.visitJumpInsn(GOTO, l3);
  mv.visitLabel(l2);
  if (logger.isDebugEnabled()) {
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Throwable", "printStackTrace", "()V",
        false);
  } else {
    mv.visitInsn(POP);
  }
  mv.visitLabel(l3);
}

@Override
public void visitMaxs(int maxStack, int maxLocals) {
  Label endFinally = new Label();
  mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
  mv.visitLabel(endFinally);
  mv.visitInsn(DUP);
  int errIdx = newLocal(Type.getType(Throwable.class));
  mv.visitVarInsn(Opcodes.ASTORE, errIdx);
  mv.visitVarInsn(Opcodes.ALOAD, statIdx);
  mv.visitVarInsn(Opcodes.ALOAD, errIdx);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_MAIN, END_METHOD, END_SIGNATURE, false);
  mv.visitInsn(ATHROW);
  mv.visitMaxs(maxStack + 8, maxLocals + 2);
}

@Override
public void visitCode() {
  super.visitCode();
  if (methodName.equals("<clinit>")) {
    startingTryLabel = new Label();
    endingTryLabel = new Label();
    super.visitLabel(startingTryLabel);
  }
}

Unit u = box.getUnit();
if (!branchTargetLabels.containsKey(u)) {
 branchTargetLabels.put(u, new Label());
startLabel = new Label();
mv.visitLabel(startLabel);
 mv.visitLabel(branchTargetLabels.get(u));
Label endLabel = new Label();
mv.visitLabel(endLabel);

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

@Test
public void shouldForwardVisitLabelToChild() {
 final Label l = new Label();
 getTesteeVisitor().visitLabel(l);
 verify(this.mv).visitLabel(l);
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEAPICALL, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_SQL, END_METHOD, END_SIGNATURE2, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_KAFKA, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);
    mv.visitVarInsn(Opcodes.ALOAD, strArgIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_SQL, CONNECT_METHOD, ERR_SIGNATURE,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_RABBIT, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);// stat
    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);// throwable
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESUBCALL, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

Javadoc

Visits a label. A label designates the instruction that will be visited just after it.

Popular methods of MethodVisitor

visitMethodInsn
Visits a method instruction. A method instruction is an instruction that invokes a method.
visitInsn
Visits a zero operand instruction.
visitVarInsn
Visits a local variable instruction. A local variable instruction is an instruction that loads or st
visitMaxs
Visits the maximum stack size and the maximum number of local variables of the method.
visitEnd
Visits the end of the method. This method, which is the last one to be called, is used to inform the
visitCode
Starts the visit of the method's code, if any (i.e. non abstract method).
visitFieldInsn
Visits a field instruction. A field instruction is an instruction that loads or stores the value of
visitTypeInsn
Visits a type instruction. A type instruction is an instruction that takes the internal name of a cl
visitLdcInsn
Visits a LDC instruction. Note that new constant types may be added in future versions of the Java V
visitJumpInsn
Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction
visitIntInsn
Visits an instruction with a single int operand.
visitLocalVariable
Visits a local variable declaration.

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How to use visitLabelmethodin org.objectweb.asm.MethodVisitor

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