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asserts.pml
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asserts.pml
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inline checkUnique(i) {
int count = 0;
count = count + (i & 1);
count = count + ((i & 2) >> 1);
count = count + ((i & 4) >> 2);
count = count + ((i & 8) >> 3);
count = count + ((i & 16) >> 4);
count = count + ((i & 32) >> 5);
count = count + ((i & 64) >> 6);
count = count + ((i & 128) >> 7);
count = count + ((i & 256) >> 8);
count = count + ((i & 512) >> 9);
count = count + ((i & 1024) >> 10);
count = count + ((i & 2048) >> 11);
if
:: count > 1 -> printf("NON-DETERMINISM: %d\n", i); //assert(false);
:: else -> skip;
fi
}
inline assertFREE(i) {
int nondet = 0;
if
// #1A
:: ((ttdstate == TTDOCCUPIED) &&
//(no FS MA is issued or no train is located on this TTD)
((trains[0].alive && trains[0].eoma < 10 && vss[trains[0].eoma].ttd < vss[i].ttd && trains[1].eoma < 10 && vss[trains[1].eoma].ttd < vss[i].ttd)
||
!trainpresentonttd)) ->
nondet = nondet | 1;
:: else -> skip;
fi
if
// #1B
:: ((ttdstate == TTDOCCUPIED) &&
//TODO: probably "trains[0].reportedposition <= i" not needed as implied by eoma
((trains[0].alive && !trains[0].hasreported && trains[0].reportedposition <= i && trains[0].eoma >= i && mutetimer[0] == 2) ||
(trains[1].alive && !trains[1].hasreported && trains[1].reportedposition <= i && trains[1].eoma >= i && mutetimer[1] == 2)) &&
//VSS is located in advance of the VSS where the train was last reported - have to check both trains
(((trains[0].alive && trains[0].reportedposition < i) && (trains[0].eoma >= i) && (!trains[0].hasreported)) || ((trains[1].alive && trains[1].reportedposition < i) && (trains[1].eoma >= i) && !trains[1].hasreported))
)
->
nondet = nondet | 1;
:: else -> skip;
fi
if
// #1C
:: ((ttdstate == TTDOCCUPIED) &&
((!trains[0].connected && disconnecttimer[i] == 2 &&
//VSS is located on the same TTD as the VSS for which the timer is expired
(trains[0].alive && trains[0].reportedposition != 255 ) &&
(vss[i].ttd == vss[trains[0].reportedposition].ttd || (trains[0].reportedlength != 255 && vss[i].ttd == vss[trains[0].reportedposition - trains[0].reportedlength].ttd)) &&
freeorunknown0) ||
(trains[1].alive && !trains[1].connected && disconnecttimer[i] == 4 &&
(trains[1].reportedposition != 255) &&
(vss[i].ttd == vss[trains[1].reportedposition].ttd || (trains[1].reportedlength != 255 && vss[i].ttd == vss[trains[1].reportedposition - trains[1].reportedlength].ttd)) &&
freeorunknown1))) ->
nondet = nondet | 1;
:: else -> skip;
fi
if
// #1D
:: ((ttdstate == TTDOCCUPIED) &&
((trains[0].alive && !trains[0].connected &&
//VSS is not located on the same TTD as the VSS for which the timer is expired
trains[0].reportedposition != 255 &&
(trains[0].reportedlength != 255 && vss[i].ttd != vss[trains[0].reportedposition].ttd && vss[i].ttd != vss[trains[0].reportedposition - trains[0].reportedlength].ttd) &&
freeorunknown0) ||
(trains[1].alive && !trains[1].connected &&
//VSS is not located on the same TTD as the VSS for which the timer is expired
trains[1].reportedposition != 255 &&
(trains[1].reportedlength != 255 && vss[i].ttd != vss[trains[1].reportedposition].ttd && vss[i].ttd != vss[trains[1].reportedposition - trains[1].reportedlength].ttd) &&
freeorunknown1)) &&
//VSS is not part of an MA
(trains[0].eoma < i || (trains[0].reportedposition - trains[0].reportedlength) > i) && (trains[1].eoma < i || (trains[1].reportedposition - trains[1].reportedlength) > i)
)
->
nondet = nondet | 1;
:: else -> skip;
fi
if
// #1E
:: ((ttdstate == TTDOCCUPIED) &&
//"reportedintegrity == 255" for modeling integrity loss
((trains[0].alive && !trains[0].reportedinteger &&
//VSS is located on the same TTD as the VSS for which the "integrity loss propagation timer" is expired
(vss[trains[0].reportedintegrity].ttd == vss[i].ttd) &&
freeorunknownint0) ||
(trains[1].alive && !trains[1].reportedinteger &&
//VSS is located on the same TTD as the VSS for which the "integrity loss propagation timer" is expired
(vss[trains[1].reportedintegrity].ttd == vss[i].ttd) &&
freeorunknownint1))) ->
nondet = nondet | 1;
:: else -> skip;
fi
if
// #1F
:: ((ttdstate == TTDOCCUPIED) &&
ghosttimer == 2 &&
freeorunknownghost1 && trains[1].alive // &&
// trains[1].reportedposition < VSSCOUNT // && //TODO: this is not correct, we should remember the timer VSS as well
//VSS is not located on the TTD for which the timer is expired
//(vss[i].ttd != vss[trains[1].reportedposition].ttd && vss[i].ttd != vss[trains[1].reportedposition - trains[1].reportedlength].ttd)
)
->
nondet = nondet | 1;
:: else -> skip;
fi
if
// #2A
:: rule2A ->
nondet = nondet | 2;
:: else -> skip;
fi
if
// #2B
:: rule2B ->
nondet = nondet | 2;
:: else -> skip;
fi
if
// #3A
:: ((ttdstate == TTDOCCUPIED) &&
//train is located on the VSS
trainidonvss != 255 &&
//lower priority than #2: !(#2A || #2B)
!(rule2A || rule2B)) ->
nondet = nondet | 4;
:: else -> skip;
fi
if
// #3B
:: ((ttdstate == TTDOCCUPIED) &&
// TTD in rear is free
(vss[i].ttd > 0 && ttd[vss[i].ttd-1].state == TTDFREE) &&
// train location is on the previous TTD
trainpresentonpreviousttd &&
// train location is not on the TTD
(!trainpresentonttd) &&
// VSS is the first VSS of the TTD
(vss[i].ttd != vss[i-1].ttd) &&
// VSS is part of the MA sent to this train
trains[trainidonpreviousttd].eoma >= i &&
//lower priority than #2: !(#2A || #2B)
!(rule2A || rule2B)) ->
nondet = nondet | 4;
:: else -> skip;
fi
checkUnique(nondet);
}
inline assertOCCUPIED(i) {
int nondet = 0;
if
// #6A
:: (ttdstate == TTDFREE) ->
nondet = nondet | 8;
:: else -> skip;
fi
if
// #6B
//integer train has reported to have left the VSS
:: trains[0].hasreported && trains[0].reportedinteger && trains[0].reportedleftvss >= i && trains[0].reportedleftvss != 255 &&
(!trains[1].alive || (real[trains[1].front].ttd < real[i].ttd))
-> nondet = nondet | 8;
:: else -> skip;
fi
if
:: trains[1].hasreported && trains[1].reportedinteger && trains[1].reportedleftvss >= i && trains[1].reportedleftvss != 255 ->
nondet = nondet | 8;
:: else -> skip;
fi
if
// #7A
:: rule7A ->
nondet = nondet | 16;
:: else -> skip;
fi
if
// #7B
:: rule7B ->
nondet = nondet | 16;
:: else -> skip;
fi
if
// #8A
:: (//train is located on the VSS
trainidonvss != 255 && trains[trainidonvss].hasreported &&
(//train reports lost integrity
!trains[trainidonvss].reportedinteger ||
//PTD with no integrity information is received outside the integrity waiting period
(!trains[trainidonvss].reportedinteger && ((trainidonvss == 0 && integritylosstimer[i] == 1) || (trainidonvss == 1 && integritylosstimer[i] == 3))) ||
//train reports changed train data length
trains[trainidonvss].reportedchangedlength == 2
) &&
//lower priority than #7: !(#7A || #7B)
!(rule7A || rule7B)) ->
nondet = nondet | 32;
:: else -> skip;
fi
if
// #8B
//train is located on the VSS
:: trainidonvss != 255 &&
//VSS in rear is UNKNOWN
i > 0 && vss[i-1].state == UNKNOWN &&
//lower priority than #7: !(#7A || #7B)
!(rule7A || rule7B) ->
nondet = nondet | 32;
:: else -> skip;
fi
if
// #8C
//another train is located on the VSS
:: trainidonvss != 255 &&
(trains[1-trainidonvss].alive && ((trains[1-trainidonvss].reportedposition == i) || (trains[1-trainidonvss].reportedposition - trains[1-trainidonvss].reportedlength == i))) &&
//lower priority than #7: !(#7A || #7B)
!(rule7A || rule7B) ->
nondet = nondet | 32;
:: else -> skip;
fi
checkUnique(nondet);
}
inline assertAMBIGUOUS(i) {
int nondet = 0;
if
// #9A
:: ttd[vss[i].ttd].state == TTDFREE ->
nondet = nondet | 64;
:: else -> skip;
fi
if
:: //integer train has reported to have left the VSS
//TODO: or "trains[0].reportedleftvss == i"?
(trains[0].hasreported &&
trains[0].reportedinteger && trains[0].reportedlength != 255 &&
trains[0].reportedleftvss != 255 && trains[0].reportedleftvss >= i &&
shadowtimerA[vss[i].ttd] == 1 &&
trains[1].alive && trains[1].reportedposition < i) ||
(trains[1].alive && trains[1].hasreported &&
trains[1].reportedinteger && trains[1].reportedlength != 255 &&
trains[1].reportedleftvss != 255 && trains[1].reportedleftvss >= i &&
shadowtimerA[vss[i].ttd] == 1)
-> nondet = nondet | 64;
:: else -> skip;
fi
if
// #10A
:: //VSS is left by all reporting trains //TODO: is it correct? - hopefuly - the train either has not reported or has left the vss
//(!trains[0].connected || vss[trains[0].reportedposition].ttd < vss[i].ttd || (trains[0].hasreported && trains[0].reportedleftvss >= i && trains[0].reportedleftvss != 255)) &&
//(!trains[1].connected || vss[trains[1].reportedposition].ttd < vss[i].ttd || (trains[1].hasreported && trains[1].reportedleftvss >= i && trains[1].reportedleftvss != 255))
(!trains[0].connected || trains[0].reportedposition < i || (trains[0].hasreported && trains[0].reportedleftvss >= i && trains[0].reportedleftvss != 255)) &&
(!trains[1].connected || trains[1].reportedposition < i || (trains[1].hasreported && trains[1].reportedleftvss >= i && trains[1].reportedleftvss != 255))
//trainidonvss == 255
-> nondet = nondet | 128;
:: else -> skip;
fi
if
// #10B
:: trainidonvss != 255 &&
// mute timer expired or end of mission reached //TODO: to check
((trainidonvss == 0 && mutetimer[0] == 2) || (trainidonvss == 1 && mutetimer[1] == 2) || (trains[trainidonvss].eom == i && trains[trainidonvss].reportedlength == 0))
-> nondet = nondet | 128;
:: else -> skip;
fi
if
// #11A
:: //(integer train located on the VSS reported to have left the TTD in rear)
trainidonvss != 255 &&
trains[trainidonvss].hasreported &&
trains[trainidonvss].reportedleftvss == ttd[vss[i].ttd].firstVSS - 1 &&
//(trains[trainidonvss].reportedlength == 0 || ttd[vss[i].ttd].firstVSS != i) &&
// vss[trains[trainidonvss].reportedleftvss].ttd < vss[i].ttd &&
// the shadow train timer expiration if the TTD in rear was not expired at the moment of the position report
// && the reported min-safe-rear-end of this train is within the distance.....
(vss[i].ttd > 0) &&
shadowtimerA[vss[i].ttd - 1] == 1
-> nondet = nondet | 256;
:: else -> skip;
fi
if
// #11B
:: ((vss[i].ttd > 0 && ttd[vss[i].ttd-1].state == TTDFREE) || (vss[i].ttd == 0)) &&
trainidonvss != 255 &&
(vss[i].ttd > 0) && (trains[trainidonvss].reportedleftvss >= ttd[vss[i].ttd].firstVSS - 1) && trains[trainidonvss].hasreported &&
(vss[i].ttd > 0) &&
(shadowtimerB[vss[i].ttd - 1] == 1)
-> nondet = nondet | 256;
:: else -> skip;
fi
checkUnique(nondet);
}
inline assertUNKNOWN(i) {
int nondet = 0;
if
// #4A
:: ttdstate == TTDFREE ->
nondet = nondet | 2048;
:: else -> skip;
fi
if
// #4B train 0
:: rule4B(0) ->
nondet = nondet | 2048;
:: else -> skip;
fi
if
// #4B train 1
:: rule4B(1) ->
nondet = nondet | 2048;
:: else -> skip;
fi
if
// #4C train 0
:: rule4C(0) ->
nondet = nondet | 2048;
:: else -> skip;
fi
if
// #4C train 1
:: rule4C(1) ->
nondet = nondet | 2048;
:: else -> skip;
fi
if
// #12A
:: rule12A &&
//lower priority than #4: !(#4B || #4C)
!(rule4B(0) || rule4B(1) || rule4C(0) || rule4C(1)) ->
nondet = nondet | 512;
:: else -> skip;
fi
if
// #12B
:: rule12B &&
//lower priority than #4: !(#4B || #4C)
!(rule4B(0) || rule4B(1) || rule4C(0) || rule4C(1)) ->
nondet = nondet | 512;
:: else -> skip;
fi
if
// #5A
:: trainidonvss != 255 && //NEW to model "train is located on the VSS": is it correct?
(trains[trainidonvss].hasreported) && //NEW 11/01/2018
//lower priority than #12
(!(rule12A || rule12B)) &&
// not #4A - ASSUMPTION - this is not in the spec. table
ttdstate != TTDFREE &&
//lower priority than #4: !(#4B || #4C)
!(rule4B(0) || rule4B(1) || rule4C(0) || rule4C(1)) ->
nondet = nondet | 1024;
:: else -> skip;
fi
checkUnique(nondet);
}