Summary:
Follow similar approach as in the translation of dictionary literal to insert load instruction to catch nil insertion into collection issues. The missing load instruction was causing false negatives in biabduction. This will also help Pulse to catch nil insertion into collection issues for array literals.
Facebook
Reviewed By: skcho
Differential Revision: D28442642
fbshipit-source-id: b530ac21b
Summary: The counter that accumulates the number of modified source files was logged before it is computed, leading to always zero results.
Reviewed By: jvillard
Differential Revision: D28505378
fbshipit-source-id: 833fb6072
Summary: Similar as for other collections we leave modelling setWithObjects:count: and initWithObjects:count for later.
Reviewed By: skcho
Differential Revision: D28473361
fbshipit-source-id: 4bf57035a
Summary:
In Buck/Java the global type environments of each buck target captured need to be merged. So do the capture DBs. These two tasks can be done concurrently, as both have a computation and an I/O component, and interleaving them should improve perf.
Indeed, profiling the merge process with `offcputime.py` and `cpudist.py` (BPF tools) showed a significant amount of off-cpu time in tests (>40%) as well as a distribution of timings for off-cpu intervals that agrees with IO on a fast medium (ssd).
This diff forks a process to merge the type environments while doing the DB merge as normal. Initial results show an almost 2x improvement.
Reviewed By: skcho
Differential Revision: D28438808
fbshipit-source-id: 89c96f25b
Summary: This diff comments out a test that introduces non-deterministic analysis result.
Reviewed By: rgrig
Differential Revision: D28440794
fbshipit-source-id: 95e6fbe06
Summary:
Collect imports and exports in a data structure ("names environment")
that is easy to look up.
Background:
A function call f(a1,...,an) is shorthand for m:f(a1,...,an) if there is
a -import(m, [..., f/n, ...]); otherwise it is shorthand for c:f(a1,...,an)
where c is the current module. There is an implicit import of the
special "erlang" module. Any ambiguity (e.g., imported twice, or
imported and local) is an error. Also, if there is a -export([...,
f/n,...]) then f/n should be marked as public (ProcAttributes)
Reviewed By: jvillard
Differential Revision: D28290252
fbshipit-source-id: f6d777eb6
Summary: `dictionaryWithObjectsForKeysCount` is a bit more complicated as we need to know if an element of an array is nil. Leaving it for later.
Reviewed By: skcho
Differential Revision: D28413859
fbshipit-source-id: 7b5116de8
Summary:
- Changed "passed as argument to f" to "in call to f", as these do not
always correspond to passing an argument (eg could be a value returned
from f)
- Changed "assigned" to "returned" when appropriate
- Changed the model of malloc() to not say "allocated" in the null case
- Don't print "returned from f" when there was no event inside f: just
print "in call to f".
Reviewed By: da319
Differential Revision: D28413900
fbshipit-source-id: bc85625e3
Summary: This diff copies each field values inside setter/getter of ObjC++.
Reviewed By: da319
Differential Revision: D28413584
fbshipit-source-id: 4c663fc9e
Summary: There is no need to model anything, Pulse is able to catch nil insertion into NSDictionary literals because the frontend dereferences keys and values during the translation of NSDictionary literals
Reviewed By: jvillard
Differential Revision: D28383176
fbshipit-source-id: 01a064daf
Summary: Current traces are difficult to read since they keep mentioning the same leaf call at each step. This diff improves the traces by tracking the intermediate callers.
Reviewed By: skcho
Differential Revision: D28384762
fbshipit-source-id: 78c4cbf7f
Summary:
The order was reversed when printing the trace, leading to confusion.
Also make sure we indicate which part of the trace we are printing when
there is more than one part (either context + access or invalidation +
access, or all three).
Also start nesting at <calling context length> to better represent the
role of the calling context visually.
Reviewed By: da319
Differential Revision: D28329263
fbshipit-source-id: b691fb1f4
Summary:
This diff addresses `GenericArrayBackedCollection.field` and others as pointers. The modeled fields are used as non-pointer struct fields, but their actual semantics are pointers that may have side effects.
For example, `GenericArrayBackedCollection.field` is used for keeping an information that the previous vector's address could be invalid.
```
void foo(vector v) {
v.push_back(0); // v's previous address may be invalid after push_back
// PRE: {v -> {backing_array -> v1}}
// POST: {v -> {backing_array -> v2}}
// ATTR: {v1 may be invalidated}
}
```
However, if we revert the modeled field values, it will return incorrect summary as follows, by reverting non-pointer parameter values.
```
// PRE: {v -> {backing_array -> v1}}
// POST: {v -> {backing_array -> v1}}
// ATTR: {v1 may be invalidated}
```
Reviewed By: jvillard
Differential Revision: D28324161
fbshipit-source-id: 96451d4b0
Summary:
`mutableDictionary[key] = value`, crashes if key is nil, however, if value is nil, any object corresponding to a key will be removed from the dictionary.
Under the hood, `NSMutableDictionary.setObject:forKeyedSubscript:` is called by `mutableDictionary[key] = value`.
Reviewed By: ezgicicek
Differential Revision: D28288789
fbshipit-source-id: e4e1c4288
Summary:
Rebar3.capture now calls into ErlangTranslator to obtain Sil. For now,
ErlangTranslator does nothing interesting.
Reviewed By: skcho
Differential Revision: D28261799
fbshipit-source-id: 0603db671
Summary:
This diff compares ObjC method names loosely when checking whether it is in the config impact data
file or not. This is to cover the cases where method parameters changed.
Reviewed By: jvillard
Differential Revision: D28259169
fbshipit-source-id: e6070df9c
Summary:
The wrapper in `infer/lib/erlang/erlang.sh` dumps Erlang AST forms [1]
in a JSON format. The current commit parses that JSON to obtain an
internal representation (ErlangAst). The main parts of the commit are:
- data structures for Erlang AST
- parser (Erlang abstract forms in JSON format -> Eralng AST)
- Rebar3.ml now drives the parser
[1] https://erlang.org/doc/apps/erts/absform.html
Reviewed By: mmarescotti, jvillard
Differential Revision: D28096896
fbshipit-source-id: b21263817
Summary:
There's been regressions in --pulse-isl. Without tests, everything is
temporary!
Note: the regressions are presumably still there, this just records the
current status of pulse.isl.
Also, no objective-C(++) at the moment. Should we add them too? (in
another diff)
Reviewed By: skcho
Differential Revision: D28256703
fbshipit-source-id: 700b2cc57
Summary:
Added a simple Erlang project to be used as a test for Rebar3
integration, in the following commits. Also, updated the copyright
linter to understand Erlang.
Reviewed By: ngorogiannis, mmarescotti
Differential Revision: D28096899
fbshipit-source-id: 94f15c277
Summary:
A previous change made pulse look into value histories for causes of
invalidation in case the access trace of a value already contained the
reason why that value is invalid, in order to save printing the
invalidation trace in addition to the access trace. It also made
reporting more accurate for null dereference as the source of null was
often better identified (in cases where several values are null or
zero).
But, the history is also relevant to the bug type and the error message.
Make these take histories into account too.
Also fix a bug where we didn't look inside the sub-histories contained
within function calls when looking for an invalidation along the
history.
Reviewed By: da319
Differential Revision: D28254334
fbshipit-source-id: 5ca00ee54
Summary:
There's already all the ingredients to treat function pointers pretty
well, even when stored inside (const) globals.
In OpenSSL they use something like the added tests but the globals are
not const... This may need tweaking via an option, eg to inline all
global initializers, or filtered by global names/file names. Or just
use the existing --pulse-model-{alloc,release}-pattern options.
Reviewed By: skcho
Differential Revision: D28221651
fbshipit-source-id: 5399f1141
Summary:
When garbage-collecting addresses we would also remove their attributes.
But even though the addresses are no longer allocated in the heap, they
might show up in the formula and so we need to remember facts about
them.
This forces us to detect leaks closer to the point where addresses are
deleted from the heap, in AbductiveDomain.ml. This is a nice refactoring
in itself: doing so fixes some other FNs where we sometimes missed leak
detection on dead addresses.
This also makes it unecessary to simplify InstanceOf eagerly when
variables get out of scope.
Some new {folly,std}::optionals false positives that either are similar to existing ones or involve unmodelled smart pointers.
Reviewed By: da319
Differential Revision: D28126103
fbshipit-source-id: e3a903282
Summary: This is a warning not a critical issue/error. Let's downgrade it to Warning to reflect that.
Reviewed By: jvillard
Differential Revision: D28220415
fbshipit-source-id: b2d8f040c
Summary:
Building on the infra in the previous commits, "fix" all the call sites
that introduce invalidations to make sure they also update the
corresponding histories. This is only possible to do when the access
leading to the invalidation can be recorded. Right now the only place
that's untraceable is the model of `free`/`delete`, because it happens
to be the only place where we invalidate an address without knowing
where it comes from (`free(v)`: what was v's access path? we could track
this in the future).
Reviewed By: skcho
Differential Revision: D28118764
fbshipit-source-id: de67f449e
Summary: Not tracking values for global constants might cause nullptr_dereference false positives. In particular, if the code has multiple checks and uses a global constant by its name in one check and its value in another check (see added test case), we are not able prune infeasible paths. This diff addresses such false positives by inlining initializers of global constants when they are being used. An assumption is that most the time the initialization of global constants would not have side effects.
Reviewed By: jvillard
Differential Revision: D25994898
fbshipit-source-id: 26360c4de
Summary:
Implements the translation of most clang atomic builtins to SIL, including those used in `stdatomic.h`. It does not attempt to model the atomicity of the operations, since I don't know of any way Infer can represent that. I didn't bother implementing the rarely used min/max builtins, so they're left as `BuiltinDecl` calls.
This is my first major OCaml project, so any feedback is appreciated!
Also, CONTRIBUTING.md says to update the [facebook-clang-plugins](https://github.com/facebook/facebook-clang-plugins) submodule, but it doesn't seem to be a submodule anymore, and the code has diverged from that repo. Should I still make a PR over there?
Pull Request resolved: https://github.com/facebook/infer/pull/1434
Reviewed By: skcho
Differential Revision: D28118300
Pulled By: jvillard
fbshipit-source-id: 121c4ad25
Summary:
Warn if either an object or a key is nil for NSMutableDictionary setObject:forKey:.
Next steps: introduce new special issue type and model more collections
Reviewed By: ezgicicek
Differential Revision: D28189382
fbshipit-source-id: 1697829ee
Summary:
Function calls that accept blocks as arguments may have additional arguments for the captured variables of the block. Cost models for these functions only considered the case where the block arguments didn't capture variables. This diff extends the model so that we handle captured variable case.
This fixes some FNs in the analysis.
Reviewed By: skcho
Differential Revision: D28183071
fbshipit-source-id: 6a045e80e
Summary:
Losing attributes is a bug, not sure when it would matter. There's a
TODO there that's still valid.
Reviewed By: da319
Differential Revision: D28125940
fbshipit-source-id: 923ceedb8
Summary: Cleaner + makes it easier to change details of the implementation.
Reviewed By: da319
Differential Revision: D28125725
fbshipit-source-id: ac9258908
Summary:
In main() all latent issues are manifest issues as the only parameters
are user-controlled.
Reviewed By: skcho
Differential Revision: D28121535
fbshipit-source-id: eab54d5bc
Summary: I should have listened to skcho on D28002725 (7207e05682). Needed for the next diff.
Reviewed By: skcho
Differential Revision: D28121203
fbshipit-source-id: 96c01b141
Summary:
On big analyses, we routinely observe analyses nesting levels of the
order of ~5k (i.e. 5342> on the interactive taskar). This call depth
is meaningless given the size of the codebase we analyze.
Instead, I believe this is due to the fact that Ondemand does not
properly snapshot/restore the nesting level when starting an analysis,
and more importantly when abandoning parts of it. This commit
fixes that oversight.
Pull Request resolved: https://github.com/facebook/infer/pull/1431
Reviewed By: ngorogiannis
Differential Revision: D28118297
Pulled By: jvillard
fbshipit-source-id: 0faf28f84
Summary:
the mapping for computing 'leq' relation in isomorphic graphs was sometimes mixed with opposite mappings due to typos in the code.
Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for how to set up your development environment and run tests.
Pull Request resolved: https://github.com/facebook/infer/pull/1424
Reviewed By: ngorogiannis
Differential Revision: D28118324
Pulled By: jvillard
fbshipit-source-id: 56e813bd1
Summary: Some code generation mechanisms produce code under `buck-out/gen/<hash>`. This diff allows handling such sources by producing deterministic capture DBs via omitting the hash.
Reviewed By: skcho
Differential Revision: D27501193
fbshipit-source-id: 3c2ac92a9
Daiva Naudziuniene
Nikos Gorogiannis
Artem Pianykh
Sungkeun Cho
Radu Grigore
Jules Villard
Ezgi Çiçek
Loc Le
kmh11
Boris Yakobowski
Yoonseok Ko