I'm beginning to realise why I didn't do the `toString` overriding way
back when. Thankfully, now that all of our tests are in the same place,
this is actually not a terrible ordeal.
This commit removes SSA nodes from the data flow graph. Specifically, for a definition and use such as
```python
x = expr
y = x + 2
```
we used to have flow from `expr` to an SSA variable representing x and from that SSA variable to the use of `x` in the definition of `y`. Now we instead have flow from `expr` to the control flow node for `x` at line 1 and from there to the control flow node for `x` at line 2.
Specific changes:
- `EssaNode` from the data flow layer no longer exists.
- Several glue steps between `EssaNode`s and `CfgNode`s have been deleted.
- Entry nodes are now admitted as `CfgNodes` in the data flow layer (they were filtered out before).
- Entry nodes now have a new `toString` taking into account that the module name may be ambigous.
- Some tests have been rewritten to accomodate the changes, but only `python/ql/test/experimental/dataflow/basic/maximalFlowsConfig.qll` should have semantic changes.
- Comments have been updated
- Test output has been updated, but apart from `python/ql/test/experimental/dataflow/basic/maximalFlows.expected` only `python/ql/test/experimental/dataflow/typetracking-summaries/summaries.py` should have a semantic change. This is a bonus fix, probably meaning that something was never connected up correctly.
Factor out use-use flow in order to do this.
Also improve names and comments.
I also wanted to change the types in `difinitionFlowStep`, but
that broke the module instantiation.
This commit is a squash of 80 other commits. While developing, things
changed majorly 2-3 times, and it just wasn't feasible to go back and
write a really nice commit history.
My apologies for this HUGE commit.
Also, later on this is where I solved merge conflicts after flow-summaries
PR was merged.
For your amusement, I've included the original commit messages below.
Python: Add proper argument/parameter positions
Python: Handle normal function calls
Python: Reduce dataflow-consistency warnings
Previously there was a lot of failures for `uniqueEnclosingCallable` and
`argHasPostUpdate`
Removing the override of `getEnclosingCallable` in ParameterNode is
probably the most controversial... although from my point of view it's a
change for the better, since we're able to provide data-flow
ParameterNodes for more of the AST parameter nodes.
Python: Adjust `dataflow/calls` test
Python: Implement `isParameterOf`/`argumentOf`/`OutNode`
This makes the tests under `dataflow/basic` work as well 👍
(initially I had these as separate commits, but it felt like it was too much noise)
Python: Accept fix for `dataflow/consistency`
Python: Changes to `coverage/argumentRoutingTest.ql`
Notice we gain a few new resolved arguments.
We loose out on stuff due to:
1. not handling `*` or `**` in either arguments/parameters (yet)
2. not handling special calls (yet)
Python: Small fix for `TestUtil/RoutingTest.qll`
Since the helper predicates do not depend on this, moved outside class.
Python: Accept changes to `dataflow/coverage/NormalDataflowTest.ql`
Most of this is due to:
- not handling any kinds of methods yet
- not handling `*` or `**`
Python: Small investigation of `test_deep_callgraph`
Python: Accept changes to `coverage/localFlow.ql`
I don't fully understand why the .expected file changed.
Since we still have the desired flow, I'm not going to worry too much
about it.
with this commit, the `dataflow/coverage` tests passes 👍
Python: Minor doc update
Python: Add staticmethod/classmethod to `dataflow/calls`
Python: Handle method calls on class instances
without trying to deal with any class inheritance, or
staticmethod/classmethod at all.
Notice that with this change, we only have a DataFlowCall for the calls
that we can actually resolve. I'm not 100% sure if we need to add a
`UnresolvedCall` subclass of `DataFlowCall` for MaD in the future, but
it should be easy to do.
I'm still unsure about the value of `classesCallGraph`, but have just
accepted the changes.
Python: Handle direct method calls `C.foo(C, arg0)`
Python: Handle `@staticmethod`
Python: Handle class method calls... but the code is shit
WIP todo
Rewrite method calls to be better
also fixed a problem with `self` being an argument to the `x.staticmethod()` call :|
Python: Add subclass tests
Python: Split `class_advanced` test
Python: Rewrite call-graph tests to be inline expectation (1/2)
This adds inline expectations, next commit will remove old annotations
code... but I thought it would be easier to review like this.
Minor fixup
Python: Add simple subclass support
Python: more precise subclass lookup
Still not 100% precise.. but it's better
New ambiguous
Python: Add test for `self.m()` and `cls.m()` calls
Python: Handle `self.m()` and `cls.m()` calls
Python: Add tests for `__init__` and `__new__`
Python: Handle class calls
Python: Fix `self` argument passing for class calls
Now field-flow tests also pass 💪 (although the crosstalk
fieldflow test changes were due to this specific commit)
I also copied much of the setup for pre/post update nodes from Ruby,
specifically having the abstract `PostUpdateNodeImpl` in DataFlowPrivate
seemed like a nice change.
Same for the setup with `TNode` definition having the specification
directly in the body, instead of a `NeedsSyntheticPostUpdateNode` class.
Python: Add new crosstalk test WIP
Maybe needs a bit of refactoring, and to see how it all behaves with points-to
Python: Add `super()` call-graph tests
Python: Refactor MethodCall char-pred
In anticipation of supporting `super(MyClass, self).foo()`, where the
`self` argument doesn't come from an AttrNode, but from the second
argument to super.
Without `pragma[inline]` the optimizer found a terrible join-order --
this won't guarantee a good join-order for the future, but for now it
was just so simple and could let me move on with life.
Python: Add basic `super()` support
I debated a little (with myself) whether I should really do
`superTracker`, but I thought "why not" and just rolled with it. I did
not confirm whether it was actually needed anywhere, that is if anyone
does `ref = super; ref().foo()` -- although I certainly doubt it's very
wide-spread.
Python: InlineCallGraphTest: Allow non-unique callable name in different files
Python: more MRO tests
Python: Add MRO approximation for `super()`
Although it's not 100% accurate, it seems to be on level with the one in
points-to.
Python: Remove some spurious targets for direct calls
removal of TODO from refactoring
remove TODOs class call support
Python: Add contrived subclass call example
Python: Remove more spurious call targets
NOTE: I initially forgot to use
`findFunctionAccordingToMroKnownStartingClass` instead of
`findFunctionAccordingToMro` for __init__ and __new__, and since I did
make that mistake myself, I wanted to add something to the test to
highlight this fact, and make it viewable by PR reviewer... this will be
fixed in the next commit.
Python: Proper fix for spurious __init__ targets
Python: Add call-graph example of class decorator
Python: Support decorated classes in new call-graph
Python: Add call-graph tests for `type(obj).meth()`
Python: support `type(obj).meth()`
Python: Add test for callable defined in function
Python: Add test for callable as argument
Current'y we don't find these with type-tracking, which is super
mysterious. I did check that we have proper flow from the arguments to
the parameters.
Python: Found problem for callable as argument :| MAJOR WIP
WIP commit
IT WORKS AGAIN (but terrible performance)
remove pragma[inline]
remove oops
Fix performance problem
I tried to optimize it even further, but I didn't end up achieving anything :|
Fix call-graph comparison
add comparison version with easy lookup
incomplete missing call-graph tests
unhandled tests
trying to replicate missing call-edge due to missing imports ... but it's hard
also seems to be problems with the inline-expectation-value that I used, seems like it has both missing/unexpected results with same value
Python: Add import-problem test
Python: Add shadowing problem
some cleanup of rewrite fix
a little more cleanup
Add consistency queries to call-graph tests
Python: Add post-update nodes for `self` in implicit `super()` uses
But we do need to discuss whether this is the right approach :O
Fix for field-flow tests
This came from more precise argument passing
Fixed results in type-tracking
Comes from better argument passing with super() and handling of
functions with decorators
fix of inline call graph tests
Fixup call annotation test
Many minor cleanups/fixes
NewNormalCall -> NormalCall
Python: Major restructuring + qldoc writing
Python: Accept changes from pre/post update node .toString changes
Python: Reduce `super` complexity !! WIP !!
Python: Only pass self-reference if in same enclosing-callable
Python: Add call-graph test with nested class
This was inspired by the ImpliesDataflow test that showed missing flow
for q_super, but at least for the call-graph, I'm not able to reproduce
this missing result :|
Python: Restrict `super()` to function defined directly on class
Python: Accept fixes to ImpliesDataflow
Python: Expand field-flow crosstalk tests
