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add support for OptionalUse in js/missing-await

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Erik Krogh Kristensen
2020-10-20 16:52:57 +02:00
parent 8b084ffe22
commit bdbc8f5c91
3 changed files with 14 additions and 5 deletions
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10
javascript/ql/src/Expressions/MissingAwait.ql
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@@ -13,20 +13,20 @@ import javascript
/**
* Holds if `call` is a call to an `async` function.
*/
predicate isAsyncCall(DataFlow::CallNode call) {
predicate isAsyncCall(DataFlow::CallNode call, boolean nullable) {
// If a callee is known, and all known callees are async, assume all
// possible callees are async.
forex(Function callee | call.getACallee() = callee | callee.isAsync())
forex(Function callee | call.getACallee() = callee | callee.isAsync()) and
if call.asExpr() instanceof OptionalUse then nullable = true else nullable = false
}
/**
* Holds if `node` is always a promise.
*/
predicate isPromise(DataFlow::SourceNode node, boolean nullable) {
isAsyncCall(node) and
nullable = false
isAsyncCall(node, nullable)
or
not isAsyncCall(node) and
not isAsyncCall(node, _) and
node.asExpr().getType() instanceof PromiseType and
nullable = true
}