opbpush3m.nc

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/*
 * Authors:   Philip Levis <[e-mail]>
 * History:   Apr 14, 2003         Inception.
 *
 */

/**
 * @author Philip Levis <[e-mail]>
 */


includes Mate;

module OPbpush3M {
  provides interface MateBytecode;
  provides interface MateBytecodeLock;
  
  uses {
    interface MateStacks as Stacks;
    interface MateVirus as Virus;
    interface MateLocks as Locks;
    interface MateError as Error;
  }
  
}

implementation {
  typedef enum {
    MATE_BUF_LOCK_3_0 = unique("MateLock"),
    MATE_BUF_LOCK_3_1 = unique("MateLock"),
    MATE_BUF_LOCK_3_2 = unique("MateLock"),
    MATE_BUF_LOCK_3_3 = unique("MateLock"),
    MATE_BUF_LOCK_3_4 = unique("MateLock"),
    MATE_BUF_LOCK_3_5 = unique("MateLock"),
    MATE_BUF_LOCK_3_6 = unique("MateLock"),
    MATE_BUF_LOCK_3_7 = unique("MateLock"),
  } BufLockNames;
  
  MateDataBuffer buffers[MATE_BUF_NUM];
  
  uint8_t varToLock(uint8_t arg) {
    switch (arg) {
    case 0:
      return MATE_BUF_LOCK_3_0;
    case 1:
      return MATE_BUF_LOCK_3_1;
    case 2:
      return MATE_BUF_LOCK_3_2;
    case 3:
      return MATE_BUF_LOCK_3_3;
    case 4:
      return MATE_BUF_LOCK_3_4;
    case 5:
      return MATE_BUF_LOCK_3_5;
    case 6:
      return MATE_BUF_LOCK_3_6;
    case 7:
      return MATE_BUF_LOCK_3_7;
    default:
      return 255;
    }
  }
    
  command result_t MateBytecode.execute(uint8_t instr,
					    MateContext* context) {
    uint8_t lock = varToLock(instr - OPbpush3);
    dbg(DBG_USR1, "VM (%i): Pushing buffer %i onto stack\n", context->which, instr & 0x1);
    if ((lock == 255) || !call Locks.isHeldBy(lock, context)) {
       call Error.error(context, MATE_ERROR_INVALID_ACCESS);
       return FAIL;
    }
    call Stacks.pushBuffer(context, &buffers[instr - OPbpush3]);
    return SUCCESS;
  }

  command int16_t MateBytecodeLock.lockNum(uint8_t instr) {
    return varToLock(instr - OPbpush3);
  }
  
  event result_t Virus.capsuleInstalled(MateCapsule* capsule) {
    int i;
    for (i=0; i < MATE_BUF_NUM; i++) {
      buffers[i].type = MATE_DATA_NONE;
      buffers[i].size = 0;
    }
    return SUCCESS;
  }

  event result_t Virus.enableExecution() {
    return SUCCESS;
  }

  event result_t Virus.disableExecution() {
    return SUCCESS;
  }

  event result_t Virus.capsuleHeard(uint8_t type) {
    return SUCCESS;
  }

  event void Virus.capsuleForce(uint8_t type) {
    return;
  }
}