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C++: Additional QLDoc.

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Geoffrey White
2020-08-25 12:21:06 +01:00
parent 23a792b8c6
commit d31987d496
1 changed files with 5 additions and 0 deletions
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5
cpp/ql/src/semmle/code/cpp/dataflow/internal/DataFlowUtil.qll
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@@ -485,6 +485,11 @@ predicate simpleLocalFlowStep(Node nodeFrom, Node nodeTo) {
exprToExprStep_nocfg(nodeFrom.asExpr(), nodeTo.asExpr())
or
// Assignment -> LValue post-update node
//
// This is used for assignments whose left-hand side is not a variable
// assignment or a storeStep but is still modeled by other means. It could be
// a call to `operator*` or `operator[]` where taint should flow to the
// post-update node of the qualifier.
exists(AssignExpr assign |
nodeFrom.asExpr() = assign and
nodeTo.(PostUpdateNode).getPreUpdateNode().asExpr() = assign.getLValue()