/*
Jacob Egner
*/

/* Includes ------------------------------------------------------------------*/

//#include "91x_type.h"
//#include "91x_map.h"

typedef unsigned long            u32;
typedef volatile unsigned short  vu16;

typedef struct
{
  vu16 CRR;
  vu16 EMPTY1;
  vu16 CMR;
  vu16 EMPTY2;
  vu16 M1R;
  vu16 EMPTY3;
  vu16 M2R;
  vu16 EMPTY4;
  vu16 A1R;
  vu16 EMPTY5;
  vu16 A2R;
  vu16 EMPTY6;
  vu16 MCR;
  vu16 EMPTY7;
  vu16 DA1R;
  vu16 EMPTY8;
  vu16 DA2R;
  vu16 EMPTY9;
  vu16 DB1R;
  vu16 EMPTY10;
  vu16 DB2R;
  vu16 EMPTY11[27];
} CAN_MsgObj_TypeDef;

typedef struct
{
  vu16 CR;
  vu16 EMPTY1;
  vu16 SR;
  vu16 EMPTY2;
  vu16 ERR;
  vu16 EMPTY3;
  vu16 BTR;
  vu16 EMPTY4;
  vu16 IDR;
  vu16 EMPTY5;
  vu16 TESTR;
  vu16 EMPTY6;
  vu16 BRPR;
  vu16 EMPTY7[3];
  CAN_MsgObj_TypeDef sMsgObj[2];
  vu16 EMPTY8[16];
  vu16 TXR1R;
  vu16 EMPTY9;
  vu16 TXR2R;
  vu16 EMPTY10[13];
  vu16 ND1R;
  vu16 EMPTY11;
  vu16 ND2R;
  vu16 EMPTY12[13];
  vu16 IP1R;
  vu16 EMPTY13;
  vu16 IP2R;
  vu16 EMPTY14[13];
  vu16 MV1R;
  vu16 EMPTY15;
  vu16 MV2R;
  vu16 EMPTY16;
} CAN_TypeDef;


#define CAN                ((CAN_TypeDef *) 0x5c009000)


// some requirements to show local variables incorrectly:
//      1: function must return a value; can not be a void function;
//      2: must have the if-then statement for localVar
//      3: must have 2 lines writing to a CAN->sMsgObj element with the use of localVar;
//          one line won't create the issue;
//          writing to CAN->sMsgObj[0] won't create the issue;
//
// perhaps you can create another bad function very different from this
// function without meeting any of the requirements above, but my experiments
// show that having a similar function that breaks any of the requirements will
// not lead to the local variable display issue
u32 badFunction(u32 passedArg)
{
    u32 localVar = 0;

    if (localVar)
    {
        localVar++;
    }

    CAN->sMsgObj[localVar].DA1R = 0;
    CAN->sMsgObj[localVar].DB1R = 0;

    return 0;
}


u32 goodFunction(u32 passedArg)
{
    u32 localVar = 0;

    if (localVar)
    {
        localVar++;
    }

    CAN->sMsgObj[0].DA1R = 0; // note the lack of localVar
    CAN->sMsgObj[0].DB1R = 0; // note the lack of localVar

    return 0;
}


int main()
{
    while(1)
    {
        badFunction(3);
        goodFunction(4);
    }

    return 0;
}