Python: support grouped exceptions #11244
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also widen type of `Try::getHandler` to `Stmt`. `ExceptStmt` is now too narrow, as a handler can also be of type `ExceptGroupStmt`.
- wrap `getType` and `getName`, considering dominance - do not implement all the handles predicates
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also add to ordinary `except`
| | 23 = @py_With | ||
| | 24 = @py_TemplateWrite | ||
| | 25 = @py_AnnAssign; | ||
| | 7 = @py_ExceptGroupStmt |
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I'm wondering if it would have been easier for update/downgrade scripts if this new kind was added in the end (as id=26)? (too late now, but something to consider for the future)
python/downgrades/47e552c4357a04c5735355fad818630daee4a5ac/py_stmts.ql
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| # This should cover all the syntactical constructs that we hope to support. | ||
| # Headings refer to https://docs.python.org/3/reference/expressions.html, | ||
| # and are selected whenever they incur dataflow. | ||
| # Intended sources should be the variable `SOURCE` and intended sinks should be | ||
| # arguments to the function `SINK` (see python/ql/test/experimental/dataflow/testConfig.qll). | ||
| # | ||
| # Functions whose name ends with "_with_local_flow" will also be tested for local flow. | ||
| # | ||
| # All functions starting with "test_" should run and execute `print("OK")` exactly once. | ||
| # This can be checked by running validTest.py. |
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Some of this text is not valid, and should be removed. I would probably delete all of it, but I think it's also acceptable to have the last two lines... up to you
| @@ -52,7 +52,7 @@ predicate iter_not_exhausted(EssaVariable iterator) { | |||
| predicate stop_iteration_handled(CallNode call) { | |||
| exists(Try t | | |||
| t.containsInScope(call.getNode()) and | |||
| t.getAHandler().getType() = stopIteration().getAValueReachableFromSource().asExpr() | |||
| t.getANormalHandler().getType() = stopIteration().getAValueReachableFromSource().asExpr() | |||
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The fact that you had to do these rewrites makes me wonder if other end-users are going to be affected in the same way, without the knowledge that they need to re-write their code? (at least this needs to be called out in the change note)
Overall I totally understand why you ended up doing it this way, and would probably have done the same if I were in your position... it just begs for us to support automatic rewrites based on qlpack versions
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Yeah, it does seem the only reasonable way to do it, but it still annoys me that we get a user facing breakage here..
| override Stmt getHandler(int i) { result = Try_.super.getHandler(i) } | ||
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QL4QL suggests that you can also remove this override.
| override Stmt getHandler(int i) { result = Try_.super.getHandler(i) } |
python/ql/lib/change-notes/2022-11-14-grouped-exceptions-breaking.md
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Co-authored-by: Rasmus Wriedt Larsen <rasmuswl@github.com>
| @@ -364,10 +386,13 @@ | |||
| result = this.getAnOrelse() | |||
| } | |||
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| override ExceptStmt getHandler(int i) { result = Try_.super.getHandler(i) } | |||
| override Stmt getHandler(int i) { result = Try_.super.getHandler(i) } | |||
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ql part of github/semmle-code#44008