CCS/TMS320F28377D: What if code in an interrupt takes more time than interrupt time?

Tool/software: Code Composer Studio

I am writing a control algorithm to run in one of the PWM interrupt with frequency of 20kHz. Meaning it happens every 5 u sec. My code can be a little bit hairy and takes more that 5 u sec. I was wondering what happens if my code in intrupt takes more than interrupt time period?

interrupt void CONTROL(void){

    Angle_update();
    ADCRead();
    PQ_compute();
    Fault_detection();

    Sync_check();

    if (sync==0){
            Vq_ref_SVM=Vq_pu;
            Vd_ref_SVM=Vd_pu;

        }



    if (sync==1){
        if (controller_type==0){
            IQD();
            Delta=__atan(Vd_ref_SVM/Vq_ref_SVM);
            abs_v_compute();
        }
        else{
            angle_control();
            v_control();

        }

    }

    if(fault_on==0){
               SVM();
               }
    else{
    EPwm5Regs.CMPA.bit.CMPA=0;
    EPwm2Regs.CMPA.bit.CMPA=0;
    EPwm6Regs.CMPA.bit.CMPA=0;
    }
    L2_on;
    FeedForward(V_abs,Delta_a_f,&P_pr,&Q_pr );
    FeedForward(V_abs,Delta_a_f,&P_pr,&Q_pr );
    L2_off;

    steady_state_check();

/*    t_count2=t_count2+1;
    if (t_count2>500){
        send_flag=1;
        t_count2=0;
    } */
    //send_flag=1;
    if (send_flag==1){
        t_count=t_count+1;
        if (t_count>3){
            Data_send();
            t_count=0;
        }
    }






	EPwm1Regs.ETCLR.bit.INT=1;
	PieCtrlRegs.PIEACK.all |= PIEACK_GROUP3;
}