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Dataflow: Simplify the call-edge join in reverse through-flow. #18515

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Dataflow: Simplify the call-edge join in reverse through-flow. #18515

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26 changes: 14 additions & 12 deletions shared/dataflow/codeql/dataflow/internal/DataFlowImpl.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -2187,11 +2187,11 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {

pragma[nomagic]
private predicate flowThroughIntoCall(
DataFlowCall call, ArgNodeEx arg, ParamNodeEx p, Ap argAp, Ap ap
DataFlowCall call, ArgNodeEx arg, ParamNodeEx p, Ap argAp
) {
exists(Typ argT, TypOption argStored |
returnFlowsThrough(_, _, _, _, pragma[only_bind_into](p), pragma[only_bind_into](argT),
pragma[only_bind_into](argAp), pragma[only_bind_into](argStored), ap) and
pragma[only_bind_into](argAp), pragma[only_bind_into](argStored), _) and
flowIntoCallTaken(call, _, pragma[only_bind_into](arg), p, isNil(argAp)) and
fwdFlow(arg, _, _, _, pragma[only_bind_into](argT), pragma[only_bind_into](argAp),
pragma[only_bind_into](argStored))
Expand Down Expand Up @@ -2285,9 +2285,9 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {
returnAp = apNone()
or
// flow through a callable
exists(DataFlowCall call, ParamNodeEx p, Ap innerReturnAp |
revFlowThrough(call, returnCtx, p, state, _, returnAp, ap, innerReturnAp) and
flowThroughIntoCall(call, node, p, ap, innerReturnAp)
exists(DataFlowCall call, ParamNodeEx p |
revFlowThrough(call, returnCtx, p, state, returnAp, ap) and
flowThroughIntoCall(call, node, p, ap)
)
or
// flow out of a callable
Expand Down Expand Up @@ -2437,11 +2437,13 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {

pragma[nomagic]
private predicate revFlowThrough(
DataFlowCall call, ReturnCtx returnCtx, ParamNodeEx p, FlowState state,
ReturnPosition pos, ApOption returnAp, Ap ap, Ap innerReturnAp
DataFlowCall call, ReturnCtx returnCtx, ParamNodeEx p, FlowState state, ApOption returnAp,
Ap ap
) {
revFlowParamToReturn(p, state, pos, innerReturnAp, ap) and
revFlowIsReturned(call, returnCtx, returnAp, pos, innerReturnAp)
exists(ReturnPosition pos, Ap innerReturnAp |
revFlowParamToReturn(p, state, pos, innerReturnAp, ap) and
revFlowIsReturned(call, returnCtx, returnAp, pos, innerReturnAp)
)
}

/**
Expand Down Expand Up @@ -2567,9 +2569,9 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {
DataFlowCall call, ArgNodeEx arg, FlowState state, ReturnCtx returnCtx, ApOption returnAp,
Ap ap
) {
exists(ParamNodeEx p, Ap innerReturnAp |
revFlowThrough(call, returnCtx, p, state, _, returnAp, ap, innerReturnAp) and
flowThroughIntoCall(call, arg, p, ap, innerReturnAp)
exists(ParamNodeEx p |
revFlowThrough(call, returnCtx, p, state, returnAp, ap) and
flowThroughIntoCall(call, arg, p, ap)
)
}

Expand Down