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: D25952894 (1bce54aaf3) changes translation of struct assignments. This diff adopts to this change for loads from global struct arrays.
Reviewed By: skcho
Differential Revision: D26398627
fbshipit-source-id: cc1fb47ab
Summary:
Before this diff:
```
// Summary of const global
// { global -> v }
n$0 =* global
// n$0 -> {global}
x *= n$0
// x -> {global}
```
However, this is incorrect because we expect `x` have `v` instead of the abstract location of `global`.
To fix the issue, this diff lookups the initializer summary when `global` is evaluated as RHS of load statement.
After this diff:
```
// Summary of const global
// { global -> v }
n$0 =* global
// n$0 -> v
x *= n$0
// x -> v
```
Reviewed By: ezgicicek
Differential Revision: D26369645
fbshipit-source-id: 98b1ed085
Summary:
Sometimes purity running failed because it couldn't find inferbo mem. Let's make it print a warning
message, instead of raising an exception.
Reviewed By: ezgicicek
Differential Revision: D26367275
fbshipit-source-id: d2350e855
Summary:
`SettableFuture.set` invokes callbacks registered prior to the call, which may also try to acquire extra locks. If the called of `set` already holds a lock this creates lock dependencies which may lead to deadlocks.
Here we warn whenever `set` is called under a lock taken in a different source file. This avoids reporting when a class internally manages locks and calls `set`, reasoning that developers will be aware this is happening.
Reviewed By: jvillard
Differential Revision: D25562190
fbshipit-source-id: d1b5cb69c
Summary:
This diff resets the id generator before generating ObjC getter/setter, so parsed results are the
same without regard to the generation order. Note that the order may change when we change the type
of Procname.t since their hash values are used for the hash set of procnames.
Reviewed By: ngorogiannis
Differential Revision: D26277348
fbshipit-source-id: a66d77845
Summary:
We are getting lots of FPs due to modeling `Provider.get` as expensive. This is coming from Dependency Injection and Infer cannot statically determine the type of the provider and determine whether that provider is expensive (requires a global analysis and instrumentation).
Instead, we are downgrading this method to the default constant cost.
Reviewed By: skcho
Differential Revision: D26223978
fbshipit-source-id: 79f81c997
Summary:
Dear Infer team,
To contribute to Infer community, I would like to integrate infer#'s language agnostic layer into Infer.
Please help to review, discuss and consider to merge this feature.
Thanks,
Xiaoyu
Pull Request resolved: https://github.com/facebook/infer/pull/1361
Reviewed By: skcho
Differential Revision: D25928458
Pulled By: jvillard
fbshipit-source-id: 7726150b8
Summary: Added some basic examples for Objective-C we want to address next in pulse nullptr dereference analysis. In particular, we should not get a `nil` dereference error when we call a method on `nil`, except if the method returns a non-POD (Plain Old Data) type.
Reviewed By: ezgicicek
Differential Revision: D26053402
fbshipit-source-id: 66f4600c3
Summary:
**Existing heuristic**: If we have a call `foo(n)` that has no model and summary for `foo`, we underestimate its cost as constant[1].
However, if we have a model for `foo` (e.g.with modeled cost O(n)) but applying the model to arguments causes the cost to be Top (e.g if `n` has Top size), then we could have Top-poisoning where all the callers up the call chain will have Top costs [2].
To prevent these unintended Top-poisioning when adding models, this diff applies *the same heuristic* to modeled calls with Top cost and gives them constant cost. This way, when adding models, we wouldn't be introducing more Tops than if we were to have no models in the first place.
[1] This is problematic in itself and causes many FPs at diff time, but otherwise we would be getting Tops everywhere and would not be able to give any meaningful cost. E.g. for fblite, if we were to give unknown calls Top cost, #procedures with Top cost increases form 5% to 38% and #procedures with linear cost reduces by 99.75%.
[2] This was observed for `containsValue` for Instagram where %Tops increased by 88% :(
Reviewed By: skcho
Differential Revision: D26174644
fbshipit-source-id: 232354923
Summary:
In practice, it is not easy to mark all of NOT initialized elements of array, so let's ignore the
array value at the moment.
Reviewed By: jvillard
Differential Revision: D25372449
fbshipit-source-id: 02b2e217c
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:
Wrap the TOPL post-processing in the exit node debug wrapper too so that
we can see what it's doing if needed.
Reviewed By: skcho
Differential Revision: D26174365
fbshipit-source-id: dd63905ff
Summary:
When a union type has a member function in C++, it is parsed as `CppClass`. However, sometimes we may want
to distinguish normal cpp classes and union classes. This diff adds a field to the type name.
Reviewed By: jvillard
Differential Revision: D26125619
fbshipit-source-id: 44a6e8192
Summary:
When a single field struct is initialized with "type x{v}" form, the translated result is not straightforward. For example,
```
struct t {
int val_;
};
void foo(t x) {
t y{x};
}
```
calls the copy constructor with `x`. This is good.
```
void foo(int n) {
t y{n};
}
```
assigns the integer `n` to `y.val_`. This is good.
```
t get_v();
void foo() {
t y{get_v()};
}
```
assigns return value of `get_v` to `y.val_`, rather than calling the copy constructor. This is not
good, but doesn't matter for actual running; `&y.val_` is the same to `&y` and `t` value is the same
to `int` value.
Reviewed By: jvillard
Differential Revision: D26146578
fbshipit-source-id: 8a81bb1db
Summary:
The test compiled with warnings, not sure how to prevent this in the
future as `infer` will suppress all warnings anyway (I wanted to add
`-Werror` to the test Makefile but that was defeated by infer itself).
Reviewed By: ezgicicek
Differential Revision: D26019682
fbshipit-source-id: d7f8fc2d8
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:
States would be considered equal when they describe the same heap shape
even though their path conditions were different. Not good.
Reviewed By: skcho
Differential Revision: D26022135
fbshipit-source-id: 510913cde
Summary:
This is all dead code but I had to do this to try something else and I
don't want to have to do that again :)
Reviewed By: skcho
Differential Revision: D26022111
fbshipit-source-id: 622ca10b9
Summary:
It is better for the derived comparison functions to start by comparing
the single offset `Q.t` instead of the map. The order of the pair
doesn't matter so the easiest way to achieve that is by putting the
offset first.
Reviewed By: skcho
Differential Revision: D26022080
fbshipit-source-id: 874ea5c66
Summary:
It's a potentially expensive operation given that it does graph
isomorphism twice on equal values so add a fast path for when they are
the same pointer. Also comparing "skipped calls" doesn't need to care
about traces.
Reviewed By: da319
Differential Revision: D26022022
fbshipit-source-id: 8178df37b
Summary: This diff fixes incorrect order of statements on `*p = !b;`.
Reviewed By: jvillard
Differential Revision: D26125069
fbshipit-source-id: 9dcefbd34
Summary:
Now that the buck java flavour is fully deployed, the genrule-based integrations for java can be removed. We also remove the combined (clang+java) integration as this will be reimplemented using flavours in the future.
Also, remove a bunch of deprecated arguments linked to these integrations.
Reviewed By: jvillard
Differential Revision: D26104384
fbshipit-source-id: 6b0059407
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:
This diff fixes incorrect order of statements on assignments.
In the translation of `LHS=RHS;`, if `RHS` is a complicated expression that introduced new nodes, eg a conditional expression, some load statements for `LHS` came after its usage. To avoid the issue, this diff forces it to introduce new nodes for `LHS`.
Reviewed By: jvillard
Differential Revision: D26099782
fbshipit-source-id: 27417cd99
Summary: This diff adds an additional parameter of struct return type in ObjC's methods. The additional parameter had been supported only in C/C++ functions/methods for 5 years (D2865091 (ec80d40bdd)). If there is no specific reason not to do that, let's do it and fix the incorrect frontend translations.
Reviewed By: jvillard
Differential Revision: D26049748
fbshipit-source-id: 414b3011f
Summary: In `ClosureSubstSpecializedMethod`, it duplicates a procedure with specialized closure parameters. Since it introduces a new procedure name, its local variables in the procedure body must be replaced to use the new procedure name. (Note that local variable type includes procedure name.) However, in the previous implementation, it missed the translations in some cases: compound expressions and metadata.
Reviewed By: ezgicicek
Differential Revision: D26075490
fbshipit-source-id: 2a5a30cd8
Summary:
In the previous live analysis, it handled class constructor targets as
dead before its calling. For example,
```
// BEFORE live variables {src}
A::A(&tgt, &src)
// AFTER live variables {tgt, src}
```
It *may* be correct if we says the field values written in `tgt` is
dead. However, we cannot says the location of `tgt` is dead.
Because of this bug,
```
A x = y;
```
was translated to
```
VARIABLE_DECLARED(x)
EXIT_SCOPE(x)
// x was dead here
A::A(&x, &y)
```
See that `EXIT_SCOPE(x)` is added right after its declaration, since
the liveness analysis said `x` was dead there.
Reviewed By: ezgicicek
Differential Revision: D26048344
fbshipit-source-id: a172994e2
Summary: This is needed to address GC stalls due to a too small heap.
Reviewed By: jvillard
Differential Revision: D26045530
fbshipit-source-id: 590d1e72c
Summary: The existing code overwrites the `BUCK_EXTRA_JAVA_ARGS` environment var. It's better to extend it with our settings, if present.
Reviewed By: artempyanykh
Differential Revision: D26045398
fbshipit-source-id: 25588488c
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: Copying Java biabduction tests into pulse tests folder. The goal is to check how well Pulse will perform on Java.
Reviewed By: jvillard
Differential Revision: D25901299
fbshipit-source-id: a117b44f5
Summary:
When C and C++ code handle a common struct typed value, the struct
type is handled as a `CStruct` in the C code, but as a `CppClass` in
the C++ code. On the other hand, `Fieldname.t` contains a string of
field and **the struct type**. As a result, even if a same field is
accessed in C and C++ code, the accessed fieldnames are different.
```
void callee_in_c(struct s* x) {
x->a = 3;
}
void caller_in_cpp() {
struct s x;
x.a = 5;
callee_in_c(&x);
// HERE
}
```
For example, in the above code, `caller_in_cpp` sets the field `a` as
5, then calls `callee_in_c`, which sets the field `a` as 3. However,
at `HERE`, the value of `x` in Pulse is `{a -> 5, a -> 3}`, because the two
fieldnames are addressed as different ones.
To avoid the issue, this diff loosens the fieldname comparison in
Pulse.
Reviewed By: jvillard
Differential Revision: D26000812
fbshipit-source-id: 77142ebda
Summary: Renaming biabduction tests in infer/tests/codetoanalyze/java/biabduction/*.java to follow our naming convention: fooOk for tests where no report is expected, fooBad when we expect a report, and FP_ or FN_ prefixes when reality doesn't match the expectation
Reviewed By: jvillard
Differential Revision: D25900575
fbshipit-source-id: ad1370085
Summary:
D20769039 (cec8cbeff2) added a preanalysis step that creates edges from throw nodes to all reachable catch nodes. It intended to fix some deadstore FPs however it caused more damage than the fix itself. In particular, throws were connected irrespective of
- the type of the exception
- whether the try was surrounded by a catch
This in turn caused weird CFGs with dangling and impossible to understand nodes:(
This diff reverts this change for now.
Instead, the fix should probably be done in the frontend where we have more information about try/catch blocks.
Reviewed By: da319
Differential Revision: D25997475
fbshipit-source-id: bbeabfbef
Summary:
When there was an assignment of C struct, `x = y;`, it was translated to the statements of load and store.
```
n$0 = *y
*x = n$0
```
However, this is incorrect in Sil, because a struct is not a value that can be assigned to registers. This diff fixes the translation as assignments of each field values :
```
n$0 = *y.field1
*x.field1 = n$0
n$0 = *y.field2
*x.field2 = n$0
...
```
It copies field values of C structs on:
* assign statement
* return statement
* declarations.
It supports nested structs.
Reviewed By: jvillard
Differential Revision: D25952894
fbshipit-source-id: 355f8db9c
Gabriela Cunha Sampaio
Loc Le
Ezgi Çiçek
Sungkeun Cho
Nikos Gorogiannis
Xiaoyu Liu
Daiva Naudziuniene
Jules Villard
Martin Trojer