Python: Fix module level flow for iterable unpacking #15755
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Currently doesn't work :O
(and for * patterns in match)
Since `PhaseDependentFlow` uses the following predicate, that relies on
.getScope() to be present for there to be any importTimeFlow (flow at
toplevel scope), it's important that data-flow nodes implement `.getScope`.
```
private predicate isTopLevel(Node node) { node.getScope() instanceof Module }
```
By implementing getScope, we can now rely on default implementation of
`getEnclosingCallable` in DataFlow::Node:
```
/** Gets the enclosing callable of this node. */
DataFlowCallable getEnclosingCallable() { result = getCallableScope(this.getScope()) }
```
yoff
approved these changes
Feb 29, 2024
I thought about it too, but it doesn't work since synthetic nodes inside synthetized summary callables needs to override it for sure 😄 |
RasmusWL
added a commit
to RasmusWL/codeql
that referenced
this pull request
Mar 1, 2024
This would have found the problem in github#15755. As highlighted in the comment in the code, it's not a perfect solution since we don't have an automatic way to ensure we don't introduce a new PhaseDependentFlow use with a new step relation and forget to add it to this consistency check... but I think this consistency check still adds value!
This was referenced Mar 1, 2024
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