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Python: Add def-use jump-steps

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This commit is contained in:
Rasmus Lerchedahl Petersen
2020-09-09 13:27:14 +02:00
parent c661f43316
commit ce7f82ddc6
3 changed files with 26 additions and 5 deletions
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15
python/ql/src/experimental/dataflow/internal/DataFlowPrivate.qll
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@@ -385,15 +385,22 @@ string ppReprType(DataFlowType t) { none() }
* another. Additional steps specified by the configuration are *not*
* taken into account.
*/
predicate jumpStep(Node pred, Node succ) {
predicate jumpStep(Node nodeFrom, Node nodeTo) {
// As we have ESSA variables for global variables,
// we include ESSA flow steps involving global variables.
(
pred.(EssaNode).getVar() instanceof GlobalSsaVariable
nodeFrom.(EssaNode).getVar() instanceof GlobalSsaVariable
or
succ.(EssaNode).getVar() instanceof GlobalSsaVariable
nodeTo.(EssaNode).getVar() instanceof GlobalSsaVariable
) and
EssaFlow::essaFlowStep(pred, succ)
(
EssaFlow::essaFlowStep(nodeFrom, nodeTo)
or
// As jump steps do not respect chronology,
// we add jump steps for each def-use pair.
nodeFrom.asVar() instanceof GlobalSsaVariable and
nodeTo.asCfgNode() = nodeFrom.asVar().getASourceUse()
)
}
//--------