Summary:
Fixing `IsInstanceOf` term simplification for null case. Before, this
was only being done if value was known to be null at the moment of the
call to `instanceof`. Otherwise, the `IsInstanceOf` term would remain in
the formula unnecessarily.
Reviewed By: jvillard
Differential Revision: D27361025
fbshipit-source-id: 2d958a757
Summary:
Models for Java Map interface.
This consists of `Map.init()`, `Map.put(key, value)`, `Map.get(key)`,
`Map.containsKey(key)` and
`Map.isEmpty()`. With the exception of `Map.get(key)` and `Map.containsKey(key)`, these functions were modelled using the respective similar ones provided by the Java Collection interface.
Reviewed By: jvillard
Differential Revision: D27326716
fbshipit-source-id: e07f0c952
Summary:
refactoring Java Integer model so that it uses the new
API designed for manipulating fields in Java.
Reviewed By: jvillard
Differential Revision: D27231810
fbshipit-source-id: 0d9e3c951
Summary:
Changing model for Java `Collection` interface. Every collection has now two internal fields, initially set to `null`. We also keep an extra field to compute emptiness. This model was implemented based on the [preexisting model for HashMap](https://github.com/facebook/infer/blob/master/infer/models/java/src/java/util/HashMap.java).
Existing models (`add`, `remove`, `set` and `is_empty`) have been updated accordingly and new models are provided: `init` and `clear`.
This model is not yet compatible with the `Map` interface but this change will happen very soon.
Reviewed By: ezgicicek
Differential Revision: D27126815
fbshipit-source-id: 79a5fe306
Summary: To implement nil summaries for unknown calls I would like to reuse functionality from PulseObjectiveCSummary which already depends on PulseOperations causing circular dependencies.
Reviewed By: jvillard
Differential Revision: D27155092
fbshipit-source-id: 1c300ead0
Summary:
See updated tests and code comments: this changes many arithmetic
operations to detect when a contradiction "p|->- * p=0" is about to be
detected, and generate a latent issue instead. It's hacky but it does
what we want. Many APIs change because of this so there's some code
churn but the overall end result is not much worse thanks to monadic
operators.
Reviewed By: skcho
Differential Revision: D26918553
fbshipit-source-id: da2abc652
Summary:
This will enable further improvements: basically we want to be able to
abort the symbolic execution of a single disjunct whenever an error is
detected. Right now there is only one kind of error, which is now
explicitly called `ReportableError`.
The next diff refactors Pulse.ISL to add its own error type so that we
are able to get rid of the isl_status field (ISLOk/ISLError) inside
abductive states. ISLError states are really `Error _` states but
previously it would have been too much of an API change to expose that.
Now it's all going to be part of `AccessResult.t`.
A further change will add another error type for when a value is found
to be 0 after the fact by the arithmetic.
Reviewed By: ezgicicek
Differential Revision: D26821178
fbshipit-source-id: 2923db8e7
Summary:
It makes more sense to return a list of results than a result of lists:
the latter stops the execution on *all* the disjuncts that would have
been in the list as soon as *one* of them fails. This is the same issue
we solved for non-ISL pulse models earlier.
Reviewed By: skcho
Differential Revision: D26818409
fbshipit-source-id: 7cc1d8b39
Summary:
Providing model for the android function TextUtils.isEmpty(). For now,
this always returns false assuming that the given value is not null.
Reviewed By: jvillard
Differential Revision: D26779619
fbshipit-source-id: 3d8e26813
Summary: Adding support for the Java instanceof operator in Pulse.
Reviewed By: jvillard
Differential Revision: D26275046
fbshipit-source-id: 8ba608cca
Summary: Adding temporary model for Collections/Map isEmpty() as an attempt to reduce false positives before we provide a full model for Collections.
Reviewed By: ezgicicek
Differential Revision: D26724085
fbshipit-source-id: d3418c173
Summary:
Adapting existing model for `new` used in ObjC to Java.
This allows to compute dynamic type information and will facilitate
handling `instanceof`, for instance.
Changing attribute value type from Typ.Name.t to Typ.t to handle arrays.
Reviewed By: da319
Differential Revision: D26687839
fbshipit-source-id: 2cfcd0625
Summary:
As a first step to support the Java `instanceof`
operator, this change allows the path condition to be appended with
`IsInstanceOf(var, typ)`.
Reviewed By: jvillard
Differential Revision: D26664009
fbshipit-source-id: cd19dce83
Summary:
Providing model for Java `instanceof` operator that
avoids to return true when given object is null. This is a temporary
solution that will reduce FPs while we do not provide the correct
semantics for `instanceof`.
Reviewed By: jvillard
Differential Revision: D26608043
fbshipit-source-id: 87c82b906
Summary:
Instead of recording some facts as "known" (i.e., observed assignments),
record them as "pruned". This should be done any time the fact is not an
assignment, for instance when path-splitting on "is the argument =0?" as
in the model of `free()`.
Reviewed By: ezgicicek
Differential Revision: D26450362
fbshipit-source-id: 4fc980f90
Summary:
These were present for `std::optional` but not `folly::Optional` for
some reason.
Reviewed By: da319
Differential Revision: D26450400
fbshipit-source-id: 45051e828
Summary:
The `--pulse-model-return-nonnull` config option currently works for C++. Now we
will be using it also for Java. Changing type from string list to regexp to
make it more general.
Reviewed By: ezgicicek
Differential Revision: D26367888
fbshipit-source-id: 9a06b9b32
Summary:
Modeling Java instanceof operator in Pulse. This
implementation does not yet provide the proper semantics for instanceof.
For now, it will always return true. This is temporary and should reduce the false positive rate.
Reviewed By: da319
Differential Revision: D26317089
fbshipit-source-id: 494e3dec5
Summary:
Having different behaviours inter-procedurally and intra-procedurally
sounds like a bad design in retrospect. The model of free() should not
depend on whether we currently know the value is not null as that means
some specs are missing from the summary.
Reviewed By: skcho
Differential Revision: D26019712
fbshipit-source-id: 1ac4316a5
Summary:
Change most `t list access_result` to `t access_result list` so that the
Ok/Error is individual to each result in the list instead of having only
a toplevel Ok/Error affecting the whole list.
To make it not horrible to write this introduces new "monadic" operators
`let<*>` and `let<+>`. They are not entirely satisfactory but perhaps
it's just a notation issue as they are not quite bind/map operators
unlike what their notation might suggest. I'd say good enough for now.
The type change induced quite the churn but the new operators simplify
the code overall.
Reviewed By: skcho
Differential Revision: D26150505
fbshipit-source-id: 33764fae3
Summary:
providing models for the checkState and checkArgument
functions, both used in Java code.
Reviewed By: da319
Differential Revision: D26101726
fbshipit-source-id: 0cc73d252
Summary: Creating model for the checkNotNull function from the Preconditions class in Pulse (Java). Whenever `checkNotNull(x)` is called, Pulse will assume that `x!= null`.
Reviewed By: ezgicicek
Differential Revision: D26075176
fbshipit-source-id: 40dcd395b
Summary: Allowing Pulse NPE reports on Nullsafe classes to be suppressed. This is now possible via the optional argument --pulse-nullsafe-report-npe (default: true).
Reviewed By: da319
Differential Revision: D25997321
fbshipit-source-id: 98465df79
Summary: Model ` std::__optional_storage_base::has_value` as this is what we see in clang AST when translating `std::optional::has_value` for libc++. For libstdc++, we get `std::optional::has_value` as expected.
Reviewed By: skcho, jvillard
Differential Revision: D25585543
fbshipit-source-id: b8d9d2902
Summary:
In `Config`, the lists generated by `mk_string_list`, `mk_path_list`, `mk_rest_actions` are reversed implicitly, which made it hard for developers to use them correctly. What the previous and this diff will do is to change the list variables of the `Config` to not-reversed one.
* diff1: First diff adds `RevList` to distinguish reversed lists explicitly. All usages of the reversed list should be changed to use `RevList`'s lib calls.
* diff2: Then this diff will change types of `Config` variables to not-reversed, normal list.
Reviewed By: ngorogiannis
Differential Revision: D25562303
fbshipit-source-id: 4cbc6d234
Summary:
In `Config`, the lists generated by `mk_string_list`, `mk_path_list`, `mk_rest_actions` are reversed implicitly, which made it hard for developers to use them correctly. What this and the next diff will do is to change the list variables of the `Config` to not-reversed one.
* diff1: First this diff adds `RevList` to distinguish reversed lists explicitly. All usages of the reversed list should be changed to use `RevList`'s lib calls.
* diff2: Then the next diff will change types of `Config` variables to not-reversed, normal list.
Reviewed By: ngorogiannis
Differential Revision: D25562297
fbshipit-source-id: b96622336
Summary: This diff revises the trace generation of the uninitialized value checker, by introducing a new diagnostics for it.
Reviewed By: jvillard
Differential Revision: D25433775
fbshipit-source-id: 1279c0de4
Summary: This diff gives semantics of dispatch_sync to call the closure parameter.
Reviewed By: jvillard
Differential Revision: D25423175
fbshipit-source-id: a45309073
Summary:
Skipping the analysis of `std::vector::empty()` caused false positives: in the case where `std::vector::empty()` was called several times ("returning" different values each time), we were not able to prune infeasible paths.
Model `std::vector::empty()` as returning the same value every time it is called.
Reviewed By: ezgicicek
Differential Revision: D23904704
fbshipit-source-id: 52e8a2451
Summary:
This diff adds uninitialized value check in pulse. For now, it supports only simple cases,
- declared variables with a type of integer, float, void, and pointer
- malloced pointer variables that points to integer, float, void, and pointer
TODOs: I will add more cases in the following diffs.
- declared/malloced array
- declared/malloced struct
- inter-procedural checking
Reviewed By: jvillard
Differential Revision: D25269073
fbshipit-source-id: 317df9a85
Summary:
Made `AbductiveDomain.summary_of_post` return a Sat/Unsat to make sure
callers filter unsat summaries. Also made `ExitProgram` take a summary
instead of a non-normalized abstract state, which was wrong (mostly
could litter the disjuncts with infeasible paths).
Reviewed By: skcho
Differential Revision: D25277565
fbshipit-source-id: 72dacb944
Summary: Model `folly::Optional::get_pointer` which returns an address to a value if exists or `nullptr` if empty.
Reviewed By: jvillard
Differential Revision: D24935677
fbshipit-source-id: 9d990fe07
Summary:
We deliberately stopped as soon as an error was detected when applying a
function call. This is not good as other pre/posts of the function may
apply cleanly, which would allow us to cover more behaviours of the
code.
Went on a bit of a refactoring tangeant while fixing this, to clarify
the `Ok None`/`Ok Some _`/`Error _` datatype returned by PulseInterproc.
Now we report errors as soon as we find them during function calls but
continue accumulating specs afterwards.
Reviewed By: da319
Differential Revision: D24888768
fbshipit-source-id: d5f2c29d7
Summary: We recently introduced a more precise model for constructing an optional from a value by making a shallow copy. However, this introduced Use After Delete false positives. For now, we go back to a less precise model by creating a fresh value. A proper model would be to either make a deep copy or call the copy constructor for a value. We will address this in the following diff.
Reviewed By: jvillard
Differential Revision: D24826749
fbshipit-source-id: 3e5e4edeb
Summary: Refactor `folly::Optional` models to make them easier to reuse for `std::optional`
Reviewed By: jvillard
Differential Revision: D24760053
fbshipit-source-id: f665e84c8
Summary: `folly::Optional::value()` returns a reference, hence an error was shown when the actual value was being accessed. Since `value()` throws an exception in case of `folly::none`, we want to show the error message at the call site of `value()`. We do this by dereferencing the result of `value()` in the model.
Reviewed By: jvillard
Differential Revision: D24702875
fbshipit-source-id: ca9f30349
Summary: Cleanup `Typ` by moving all constant types to `StdTyp`. Also remove `Typ.typ` as it's just `Typ.t` now.
Reviewed By: jberdine
Differential Revision: D24620397
fbshipit-source-id: 4764f87ef
Summary:
Before we were creating a fresh internal value when we were constructing `folly::Optional`. This diff models `folly::Optional` constructor more precisely by copying the given value.
There was also a missing dereference in the model of `value_or`
Reviewed By: jvillard
Differential Revision: D24621016
fbshipit-source-id: c86d3c157
Summary: Model `folly::Optional::value_or(default)` to return value if not-empty and `default` if empty.
Reviewed By: jvillard
Differential Revision: D24539456
fbshipit-source-id: cc9e176cc
Summary:
This makes sure we call `AbductiveDomain.summary_of_post` exactly once
per post-condition. Notice in particular in the diff:
- in Pulse.ml we remove a now-certified-useless "is_unsat_expensive"
call
- in PulseOperations.ml we add a previously-missing call to
`summary_of_post` (it's needed to remove local variables from the
symbolic state + normalize)
The price to pay is ugly type annotations and down-casting peppered in a
few places, in reasonable number.
Reviewed By: da319
Differential Revision: D24078564
fbshipit-source-id: 3102cacf0
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:
This can be useful to make pulse forget about tricky parts of the code.
Treat "skipped" procedures as unknown so heuristics for mutating the
return value and parameters passed by reference are applied.
Reviewed By: ezgicicek
Differential Revision: D23729410
fbshipit-source-id: d7a4924a8
Summary: Added a model for copy constructor for `std::function`. In most cases, the SIL instruction `std::function::function(&dest, &src)` gives us pointers to `dest` and `src`, hence, we model the copy constructor as a shallow copy. However, in some cases, e.g. `std::function f = lambda_literal`, SIL instruction contains the closure itself `std::function::function(&dest, (operator(), captured_vars)`, hence, we need to make sure we copy the right value.
Reviewed By: ezgicicek
Differential Revision: D23396568
fbshipit-source-id: 0acb8f6bc
Gabriela Cunha Sampaio
Ezgi Çiçek
Daiva Naudziuniene
Jules Villard
Sungkeun Cho
Loc Le
Nikos Gorogiannis