org.objectweb.asm.MethodVisitor.visitVarInsn 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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}

@Override
public void visitInsn(int opcode) {
  if ((opcode >= IRETURN && opcode <= RETURN)) {
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE, false);
  }
  mv.visitInsn(opcode);
}

  @Override
  public void visitCode() {
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_METHOD, START_SIGNATURE, false);
    mv.visitCode();
  }
}

private static void writeRelease(MethodVisitor methodVisitor, int wOffset, int type, Class<? extends ProxyChannelRingBuffer> backendType) {
  methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
  methodVisitor.visitVarInsn(Opcodes.LLOAD, wOffset);
  methodVisitor.visitLdcInsn(type);
  methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(backendType), "writeRelease", "(JI)V", false);
}

  @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, 1);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    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 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

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 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();
}

  @Override
  public void visitInsn(int opcode) {
    if ((opcode >= IRETURN && opcode <= RETURN)) {
      mv.visitVarInsn(ALOAD, 0);
      mv.visitVarInsn(ALOAD, 1);
      mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE, END_METHOD, END_SIGNATURE, false);
    }
    mv.visitInsn(opcode);
  }
}

  @Override
  public void visitCode() {
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, CALL_METHOD, CALL_SIGNATURE, false);
    mv.visitVarInsn(Opcodes.ASTORE, 1);
    mv.visitCode();
  }
}

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.visitVarInsn(Opcodes.ALOAD, 4);
mv.visitJumpInsn(Opcodes.IFNULL, 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, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, "com/mysql/jdbc/ConnectionImpl", "host", "Ljava/lang/String;");
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, "com/mysql/jdbc/ConnectionImpl", "port", "I");
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, "com/mysql/jdbc/ConnectionImpl", "database", "Ljava/lang/String;");

@Override
public void visitCode() {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitVarInsn(ALOAD, 1);
  mv.visitVarInsn(ALOAD, 2);
  mv.visitMethodInsn(INVOKESTATIC, "org/springsource/loaded/test/infra/RewriteReflectUtilsDefineClass",
      "defineClass",
      "(Ljava/lang/String;[BLjava/lang/ClassLoader;)[B");
  mv.visitVarInsn(ASTORE, 1);
}

@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);
}

private void visitCallObjectHashCode(MethodVisitor mv) {
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  String owner = "java/lang/Object";
  String name = "hashCode";
  String desc = "()I";
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, owner, name, desc, false);
  mv.visitInsn(Opcodes.IRETURN);
}

  @Override
  public void visitCode() {
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, respIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, START_METHOD, START_SIGNATURE, false);

    mv.visitCode();
  }
}

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);
  switch (tp.getSort()) {
  case Type.BOOLEAN:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;",
        false);
    break;
  case Type.BYTE:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;", false);
    break;
  case Type.CHAR:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;",
        false);
    break;
  case Type.SHORT:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
  case Type.INT:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    break;

  @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);
  }
}

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);
}

  @Override
  public void visitCode() {
    if (ON_COMPLETE_SELF_DISPATCH_METHOD.equals(name+desc)) {
      mv.visitVarInsn(Opcodes.ALOAD, 0);
      mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, SELF_DISPATCH_METHOD, SELF_DISPATCH_SIGNATURE, false);
    } else {
      mv.visitVarInsn(Opcodes.ALOAD, 0);
      mv.visitVarInsn(Opcodes.ALOAD, 2);
      mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_METHOD, START_SIGNATURE, false);
    }
    mv.visitCode();
  }
}

AsmUtil.PUSH(mv, paramTypes.length);
mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
mv.visitVarInsn(Opcodes.ASTORE, arrVarIdx);
  mv.visitVarInsn(Opcodes.ALOAD, arrVarIdx);
  AsmUtil.PUSH(mv, i);
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;",
        false);
    break;
  case Type.BYTE:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;", false);
    break;
  case Type.CHAR:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;",
        false);
    break;
  case Type.SHORT:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
  case Type.INT:
    mv.visitVarInsn(Opcodes.ILOAD, sidx);
    break;
  case Type.LONG:
    mv.visitVarInsn(Opcodes.LLOAD, sidx);

  @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);
  }
}

Javadoc

Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable.

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.
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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