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

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Common ways to obtain MethodVisitor

private void myMethod () {
 MethodVisitor m =ClassVisitor zuper;zuper.visitMethod(access, name, desc, signature, exceptions)
ClassVisitor cv;String name;String desc;String signature;String[] exceptions;cv.visitMethod(access, name, desc, signature, exceptions)
ClassVisitor cv;cv.visitMethod(access, "<init>", "()V", null, null)
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}

private static void createFloatObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Float");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.FLOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Float", "<init>", "(F)V");
  mv.visitInsn(Opcodes.AASTORE);
}

private void visitMethodStub(MethodVisitor mv) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
  mv.visitInsn(Opcodes.DUP);
  mv.visitLdcInsn("Stub!");
  String owner = "java/lang/RuntimeException";
  String name = "<init>";
  String desc = "(Ljava/lang/String;)V";
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, owner, name, desc, false);
  mv.visitInsn(Opcodes.ATHROW);
}

private static void loadLocalIndexAndApplyDelta(MethodVisitor methodVisitor, int localVariableIndex, long delta) {
  methodVisitor.visitVarInsn(Opcodes.LLOAD, localVariableIndex);
  if (delta != 0) {
    methodVisitor.visitLdcInsn(delta);
    methodVisitor.visitInsn(Opcodes.LADD);
  }
}

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();
    mv.visitLabel(e.getValue());
    mv.visitLdcInsn(e.getKey());
    mv.visitInsn(ARETURN);
  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();

@Override
public void visitCode() {
  mv.visitVarInsn(Opcodes.ALOAD, 1);
  mv.visitVarInsn(Opcodes.ALOAD, 2);
  if (httpservlet) {
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_SERVICE, START_SIGNATURE, false);
  } else {
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_FILTER, START_SIGNATURE, false);
  }
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitVarInsn(Opcodes.ALOAD, statIdx);
  mv.visitVarInsn(Opcodes.ALOAD, 1);
  mv.visitVarInsn(Opcodes.ALOAD, 2);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, REJECT, REJECT_SIGNATURE, false);
  Label end = new Label();
  mv.visitJumpInsn(IFNULL, end);
  mv.visitInsn(Opcodes.RETURN);
  mv.visitLabel(end);
  mv.visitCode();
}
@Override

constructorWriter.visitInsn(RETURN);
constructorWriter.visitMaxs(DEFAULT_MAX_STACK, 1);
this.constructorWriter.visitEnd();
proxyBeanDefinitionWriter.visitBeanDefinitionEnd();
if (targetDefinitionGenerator != null) {

public void end_class() {
  if (staticHook != null && staticInit == null) {
    // force creation of static init
    begin_static();
  }
  if (staticInit != null) {
    staticHook.return_value();
    staticHook.end_method();
    rawStaticInit.visitInsn(Constants.RETURN);
    rawStaticInit.visitMaxs(0, 0);
    staticInit = staticHook = null;
    staticHookSig = null;
  }
  cv.visitEnd();
}

private void visitInitStub(ClassDef classDef, MethodVisitor mv) {
  mv.visitCode();
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  if (classDef.getSuperclass() != null) {
    String superName = stripName(classDef.getSuperclass());
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, superName, "<init>", "()V", false);
  }
  mv.visitInsn(Opcodes.RETURN);
  mv.visitMaxs(0, 0);
  mv.visitEnd();
}

private static void createBooleanObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Byte");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Byte", "<init>", "(B)V");
  mv.visitInsn(Opcodes.AASTORE);
}

mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitJumpInsn(Opcodes.IFNULL, sqlIsNull);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitJumpInsn(Opcodes.GOTO, endIf);
mv.visitInsn(Opcodes.DUP);
mv.visitVarInsn(Opcodes.ALOAD, 4);
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/mysql/jdbc/Buffer", "getByteBuffer", "()[B");
mv.visitLdcInsn("utf-8");
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/String", "<init>", "([BLjava/lang/String;)V");
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitVarInsn(Opcodes.ALOAD, 30);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "com/taobao/profile/Profiler", "start4Mysql", "(Ljava/lang/String;ILjava/lang/String;Ljava/lang/String;)V");
mv.visitCode();

  @Override
  public void handleMethodTranslateException(Method method, DexMethodNode methodNode, MethodVisitor mv, Exception e) {
    // replace the generated code with
    // 'return new RuntimeException("D2jFail translate: xxxxxxxxxxxxx");'
    StringWriter s = new StringWriter();
    s.append("d2j fail translate: ");
    e.printStackTrace(new PrintWriter(s));
    String msg = s.toString();
    mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
    mv.visitInsn(Opcodes.DUP);
    mv.visitLdcInsn(msg);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(Opcodes.ATHROW);
  }
}

public void end_class() {
  if (staticHook != null && staticInit == null) {
    // force creation of static init
    begin_static();
  }
  if (staticInit != null) {
    staticHook.return_value();
    staticHook.end_method();
    rawStaticInit.visitInsn(Constants.RETURN);
    rawStaticInit.visitMaxs(0, 0);
    staticInit = staticHook = null;
    staticHookSig = null;
  }
  cv.visitEnd();
}

  @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);
  }
}

private static void createCharObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Character");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Character", "<init>", "(C)V");
  mv.visitInsn(Opcodes.AASTORE);
}

    mv.visitVarInsn(Opcodes.ALOAD, sidx);
  mv.visitInsn(Opcodes.AASTORE);
  sidx += tp.getSize();
mv.visitVarInsn(Opcodes.ALOAD, arrVarIdx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESUBCALL, START_METHOD, START_SIGNATURE, false);
mv.visitCode();

  @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);
  }
}

private static void createIntegerObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Integer");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Integer", "<init>", "(I)V");
  mv.visitInsn(Opcodes.AASTORE);
}

@Override
public void visitCode() {
  int sidx = 1;
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  AsmUtil.PUSH(mv, fullName);
  AsmUtil.PUSH(mv, className);
  AsmUtil.PUSH(mv, name);
  AsmUtil.PUSH(mv, desc);
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  int arrVarIdx = newLocal(Type.getType("[Ljava/lang/Object;"));
  AsmUtil.PUSH(mv, paramTypes.length);
  mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
  mv.visitVarInsn(Opcodes.ASTORE, arrVarIdx);
  for (int i = 0; i < paramTypes.length; i++) {
    Type tp = paramTypes[i];
    mv.visitVarInsn(Opcodes.ALOAD, arrVarIdx);
    AsmUtil.PUSH(mv, i);
    AsmUtil.loadForArrayElement(mv, tp, sidx);
    mv.visitInsn(Opcodes.AASTORE);
    sidx += tp.getSize();
  }
  mv.visitVarInsn(Opcodes.ALOAD, arrVarIdx);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, START_METHOD, START_METHOD_DESC,false);
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitCode();
}

  @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);
  }
}

private static void createShortObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Short");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Short", "<init>", "(S)V");
  mv.visitInsn(Opcodes.AASTORE);
}

Javadoc

Visits a zero operand instruction.

Popular methods of MethodVisitor

visitMethodInsn
Visits a method instruction. A method instruction is an instruction that invokes a method.
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
visitLabel
Visits a label. A label designates the instruction that will be visited just after it.
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 visitInsnmethodin org.objectweb.asm.MethodVisitor

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