Summary:
When extracting summaries, ask PulseFormula to work harder to prove that
path-conditions are unsat. This reduces the number of false positives.
Reviewed By: jvillard
Differential Revision: D25270609
fbshipit-source-id: 61ef5e8ac
Summary:
Added a topl-max-disjuncts, which is analogous to pulse-max-disjuncts.
Note, however, that the maximum number of states tracked will be the
product of the two limits.
Added also topl-max-conjuncts, which drops Topl states that became too
complex.
Reviewed By: jvillard
Differential Revision: D25240386
fbshipit-source-id: 588c90390
Summary:
This diff adds a new issue type for reporting modifications to immutable fields (when `report-immutable-modifications` is enabled).
The underlying analysis depends on impurity analysis which itself is based on post-processing of pulse's summaries.
Reviewed By: skcho
Differential Revision: D25216637
fbshipit-source-id: 42e843793
Summary:
Previously, impurity analysis only collected one access for a single modification but not all other modifying accesses. This diff
- changes the impurity domain to collect all modifying accesses
- tracks and prints all the accesses seen to reach the modification, improving readability&debugging
Recording all accesses are needed in the next diff to determine if a method modifies any immutable fields. To determine that, we need to know all modifications, not just a single one.
Reviewed By: skcho
Differential Revision: D25186516
fbshipit-source-id: 43ceb3cd8
Summary: The main point here is to ignore owned interfaces when considering whether to warn about non-thread-safe calls.
Reviewed By: ezgicicek
Differential Revision: D25187775
fbshipit-source-id: c2a7ce89c
Summary:
For a long sequence of calls nop();...;nop() the runtime was quadratic
because formals and actuals were bound via equalities. Now,
substitutions are used, when easy.
Reviewed By: jvillard
Differential Revision: D25211504
fbshipit-source-id: 696e3dcdf
Summary:
If f() calls g() and g() violates a property, there used to be two
traces (one for f() and one for g()) even if all that f() has to do with
the property is that it calls g(). Now the error is reported only in
g().
Reviewed By: jvillard
Differential Revision: D25210007
fbshipit-source-id: 68ea57e71
Summary:
A "large step" is a call, and it is "trivial" if it does not affect the
automaton state; i.e., if it is irrelevant to the property being
tracked.
Reviewed By: jvillard
Differential Revision: D25209670
fbshipit-source-id: bf3e594b3
Summary:
Makes sure that topl summaries don't repeat. Previously this happened
when two posts led to the same summary when procedure-local variables
were killed. Such repeated summaries quickly lead to exponential
explosion. (For example, the added test -- `ManyLoops.java` -- didn't
finish in any reasonable time.)
Reviewed By: jvillard
Differential Revision: D25209623
fbshipit-source-id: 04b1a3e12
Summary:
Now one can use the pattern #ArrayWrite(A,I) to match on a write at
index I in array A. This only works in the Pulse variant of Topl (not in
the one based on SIL instrumentation).
Reviewed By: jvillard
Differential Revision: D25202768
fbshipit-source-id: 479f434e3
Summary:
PulseTopl.large_step is now implemented
All active tests are migrated now to topl-in-pulse.
Reviewed By: jvillard
Differential Revision: D25179556
fbshipit-source-id: dc1136bab
Summary:
When running the deep-Pulse version of Topl, it now produces and reports
traces.
Reviewed By: jvillard
Differential Revision: D25177139
fbshipit-source-id: 6955ee0cd
Summary:
This diff makes the issue to be rendered more clearly. Before, we used to report
weirdly looking unconventional mode names like NullsafeLocal, even when
exact mode name was irrelevant.
Reviewed By: artempyanykh
Differential Revision: D25186041
fbshipit-source-id: 2619bcbd2
Summary:
In all other places, we index params from 0, but accidentally recorded
the wrong number in json. It was because of the confusion between index
and user-visible param position that we show for the user message.
This diff fixes it: now we use 0-based indices internally (but of course still
report 1-based ones in the error message).
Reviewed By: artempyanykh
Differential Revision: D24916878
fbshipit-source-id: 45532c5ff
Summary:
The starvation domain keeps a domain element per distinct pair of lock object and source location. This was used to counteract the imprecision of implicit Quandary-style traces. Starvation has used explicit traces for a long time now, so keeping all these elements is expensive (in fact, in some cases exponential) and of no value. Now, lock object identity is the only distinguishing feature of a domain element.
Also, fix some pretty printing for debugging purposes.
Reviewed By: jvillard
Differential Revision: D24829306
fbshipit-source-id: 22e12f9c1
Summary:
If the issue one of:
- Field Not Nullable
- Field Not Initialized
- Field Overannotated,
we record field_name to .json result.
NoTE: Design choice for representation. For Field Not Initialized and Field Overannotated
this is always internal (relative to the class) field, but for Field Not
Nullable it can be either internal or external. We could have a
structured output, or always output full name. I preferred to output
short name for convenience of the main usacase I am anticipating.
NOTE: not to be confused with the case where the field is nullable but
we e.g. try to dereference it. This is indirectly related to the issue
(can be several such fields for starters) and if we one day output it,
it will be provided in a separate way (similarly to how we output
nullable_methods).
Reviewed By: artempyanykh
Differential Revision: D24730320
fbshipit-source-id: c995ec221
Summary:
We never tested params dependent on things (tested only things dependend
on params).
Reviewed By: artempyanykh
Differential Revision: D24726858
fbshipit-source-id: a0861cfc3
Summary:
Since we report issues types without a prefix (e.g. ERADICATE_) and
with spaces we should also allow for prefix-less issue types in
SuppressLint, so both should work
- SuppressLint("eradicate-field-not-initialized")
- SuppressLint("Field Not Initialized")
Reviewed By: jvillard
Differential Revision: D24760341
fbshipit-source-id: 1590cf6d0
Summary:
There is a feature in Nullsafe that is interfering with "annotation
graph" feature. Because of this we would not detect provisional
violations for misuses of params of equals() (They will be recorded
as user facing rather than provisional issues).
This diff turns this feature off for annotation graph mode.
Reviewed By: artempyanykh
Differential Revision: D24726655
fbshipit-source-id: 4b7577667
Summary:
Virtual "this" invisible param exists in the annotated signature, but
does not exist in some other places, which causes a lot of annoyance in
different places.
This diff does not intend to solve all this, but makes one step forward.
1/ AnnotatedNullability now explicitly distincts normal params and
VirtualThis.
2/ AnnotatedSignature accounts for this via: a) not having redundant
fake annotation points b) having corrent param indices (those were off
by 1 in non-virtul methods).
Reviewed By: artempyanykh
Differential Revision: D24726480
fbshipit-source-id: fdb8bb0fb
Summary: This is a complex enough feature so iterating on it in a safe manner will be useful.
Reviewed By: artempyanykh
Differential Revision: D24725406
fbshipit-source-id: 81b247143
Summary:
The problem in Reporting.ml:log_issue_from_summary is that it merely
checks the presence of `SuppressLint` annotation on method's body to
decide whether to log or not the issue. This means that regardless of
issue types specified in `SuppressLint`, all issues on such method will
get blocked.
Here we fix that.
Reviewed By: ngorogiannis, mityal
Differential Revision: D24726604
fbshipit-source-id: c9cae3833
Summary:
This diff adds an option hiding function pointers in costs to users: `cost-suppress-func-ptr` is
true by default.
Reviewed By: ezgicicek
Differential Revision: D24448212
fbshipit-source-id: 88f6b5ea1
Summary:
Take another page from the Incorrectness Logic book and refrain from reporting issues on paths unless we know for sure that this path will be taken.
Previously, we would report on paths that are merely *not impossible*. This goes very far in the other direction, so it's possible we'll want to go back to some sort of middle ground. Or maybe not. See the changes in the tests to get a sense of what we're missing.
Reviewed By: ezgicicek
Differential Revision: D24014719
fbshipit-source-id: d451faf02
Summary: We add a naive model for `forEach` idiom for Java's Iterable and Maps. The model is naive because it doesn't take the cost of the lambda into account. This will be fixed later.
Reviewed By: da319
Differential Revision: D23868203
fbshipit-source-id: 37d169c6f
Summary:
This can be used by additional tooling for further analysis (e.g.
codemods, autofixes, etc).
Reviewed By: ngorogiannis
Differential Revision: D23987694
fbshipit-source-id: b9fa343ac
Summary: Subtle false positives and negatives in Hil make Sil preferable. This diff gets rid of the CFG-emulation of Hil, while still using Hil expressions.
Reviewed By: da319
Differential Revision: D23815026
fbshipit-source-id: 731a6d299
Summary:
The previous diffs recorded it for the case when the unvetted value is
dereferenced or otherwise used wrongly. This case finishes the work,
recording the needed signature for the remaining case (when the
offending third party has a non-nullable param with nullable passed
inside)
Reviewed By: ngorogiannis
Differential Revision: D23706679
fbshipit-source-id: e6f641223
Summary:
If the issue is related to the use of an unvetted third party method
that can not be trusted, we record this fact.
Reviewed By: ngorogiannis
Differential Revision: D23705626
fbshipit-source-id: 851328fe5
Summary:
It was inconsistent before (we recorded it only for meta issues).
Now we always record it, which will simplify further diffs.
In the next diffs, we are going to add more fields inside `nullsafe_extra`.
Reviewed By: ngorogiannis
Differential Revision: D23705592
fbshipit-source-id: 8bbb0e7c8
Summary:
Handle the case of
- computing the range of `[lb, ub]` where `lb` contains length path and `ub` is constant. E.g. `[a.length, 2]` would give `3` range
- simplifying `c1 +/- min(c2, a.length)` to `c1 +/- min(c2, 0)`
since the length of a collection/array is always nonnegative.
This also removes some existing FPs in tests results.
Facebook
Context: we stumbled upon this issue in ObjC results TV109717121 which is corresponding to the added test case.
Reviewed By: skcho
Differential Revision: D23648807
fbshipit-source-id: 1e89ea246
Summary: We only added suffix-stripped prefixes of props but this causes FPS if a component declares props that actually contain suffixes since we strip them when we are adding builder calls. The fix is to add both normal and stripped versions.
Reviewed By: skcho, Katalune
Differential Revision: D23375405
fbshipit-source-id: e99cb4dd8
Summary:
Report errors found by running Topl on top of Pulse, when using
--topl-pulse. Topl tests now run on top of Pulse.
Reviewed By: jvillard
Differential Revision: D23030771
fbshipit-source-id: 8770c2902
Summary:
The generated code used to contain Prune statements that had boolean
connectives in their conditions. After this commit, all conditions
should have no boolean connective (LNot, LOr, LAnd) at top-level; that
is, prune conditions should be atomic.
The main motivation behind this change is that (a) frontends follow this
convention, and (b) Pulse assumes this convention.
Reviewed By: jvillard
Differential Revision: D23022273
fbshipit-source-id: 1313328e4
Summary:
We already take into account inheritance if the method inherits a known
modelled initializer method (e.g. Activity.onCreate()).
But if the method is explicitly marked as Initializer, we require its
overrides to be also marked.
This diffs fixes the behavior and makes it consistent, now this is
enough to annotate only parent class.
Reviewed By: jvillard
Differential Revision: D23135177
fbshipit-source-id: a21ff4a0e
Summary:
Current handling of lambdas is quite rudimentary. Looking at test
results we can see that errors are all over the place: False Positives,
False Negatives and just plain wrong results.
These tests can be grouped in 2 sets:
1. Basic support which implies:
- understanding method signatures,
- providing comprehensible error messages.
2. Extended support with implies:
- understanding scoping of values captures in lambdas (needs proper aliasing analysis).
- understanding parametric nullability in generics (needs "some"
support for Generics in our Java frontend).
With follow-up patches I'll attempt to implement "Basic" support for
Lambdas. "Extended" support will be out of scope unless there's
significant demand.
Reviewed By: mityal
Differential Revision: D23058673
fbshipit-source-id: 621551cca
Summary:
This diff adds a false positive test that is introduced imprecise loop
invariant detection.
In the example, `i` and a temp variable `$irvar = get_size(arr)` are
all included in the control variables, so the complexity becomes
quadratic. The problem is that `$irvar` is not addressed as a loop
invariant:
* `is.read` is analyzed as modifying a global
* all return variables, including `$irvar`, of unmodeled functions are invalidated
Reviewed By: ezgicicek
Differential Revision: D23051414
fbshipit-source-id: 011fd086b
Summary:
Synthetic/autogenerated methods/fields usually contain `$` in their names.
Reporting nullability violations on such code doesn't make much sense
since the violations are not actionable for users and likely need to be
resolved on another level.
This diff contributes:
1. Several test cases that involve synthetic code of different
complexity.
2. Code that handles some particular types of errors (but not all!).
Reviewed By: mityal
Differential Revision: D22984578
fbshipit-source-id: d25806209
Summary:
`java_type` aka `JavaSplitName.t` is a pair of strings. It's used in a procname to store the return type. Replace that with `Typ.t`.
This is step one of deleting `JavaSplitName`. Step two will be to replace parameters with `Typ.t`.
Reviewed By: skcho
Differential Revision: D20323748
fbshipit-source-id: f0029c3ca
Summary:
This diff removes a dead field `Struct.subs`, which was used in
heuristics finding methods from sub-classes.
Reviewed By: ezgicicek
Differential Revision: D22945346
fbshipit-source-id: 4b3bf0093
Summary:
In Cost/Inferbo checkers, it tried to find a subclass with heuristics when a method of interface or
abstract class is called. While it makes preciser analysis results in general, sometimes introduced
tricky FPs since the behavior of the heuristics depends on targets. This diff revert the heuristics
to suppress the FPs.
Reviewed By: ngorogiannis
Differential Revision: D22924485
fbshipit-source-id: 9f151231f
Radu Grigore
Ezgi Çiçek
Nikos Gorogiannis
Mitya Lyubarskiy
Artem Pianykh
Sungkeun Cho
Jules Villard
Dulma Churchill