Summary:
Using more than the "known" part of the arithmetic could accidentally
leak "pruned" information into certain facts.
I noticed this when adding more term equality reasoning to pulse in
another diff. At the moment this has little effect but is still more
correct conceptually.
Reviewed By: ezgicicek
Differential Revision: D26450333
fbshipit-source-id: eb31da344
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:
ClangWrapper.ml was skipping clang commands that didn't capture
by default. It was using the 'skip_analysis_in_path_skips_compilation'
flag to NOT skip commands. This is a confusing use of that flag.
Default should be to run clang (in case it does something useful),
and a new flag to disable this.
Reviewed By: ngorogiannis
Differential Revision: D26459100
fbshipit-source-id: 7f2e9a269
Summary: In Objective-C, `static const int var = ..` is not recognized as ICE (integral constant expression) unlike C++. To handle such loads better, this diff adds a check for `constant_global_array` as a workaround.
Reviewed By: skcho
Differential Revision: D26369461
fbshipit-source-id: e2dae11f1
Summary:
Races in Nullsafe classes can undermine NPE safety despite the class passing the type checks.
This diff adds to the report text of THREAD_SAFETY_VIOLATION and GUARDEDBY_VIOLATION the following trailer:
> Data races in `Nullsafe` classes may still cause NPEs.
This only happens if the race is directly on a non-primitively-typed member field of the class.
It also uses distinct bug types (adds the suffix _NULLSAFE to the bug types above) for easier accounting.
Reviewed By: ezgicicek
Differential Revision: D26403274
fbshipit-source-id: 3cd6ca082
Summary: As there are no dependencies between procedure and file analyses in RacerD, split them into separate modules.
Reviewed By: ezgicicek
Differential Revision: D26198874
fbshipit-source-id: 032aad9d8
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: 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
Summary:
- We hoist calculation of `loop_head_to_loop_nodes` to simplify `get_loop_control_map` and also to allow it to be used by inefficient keyset iterator without needing to compute exit maps unnecessarily.
- nit on comments
- `open Control` in `loop_control.ml`
- hoist bound map calculation in `cost.ml`
Reviewed By: ngorogiannis
Differential Revision: D25952592
fbshipit-source-id: ef6103497
Summary:
Clang front-end is confused about exceptional CF. For the following program
```
void throw_positive(int b) {
if (b > 0) {
throw std::length_error("error");
}
}
void foo( std::vector<std::string> traceTokens){
if (traceTokens.size() < 13) {
throw std::invalid_argument("Exception!"); // 1
}
for (int i = 13; i < traceTokens.size(); ++i) {
try {
throw_positive(traceTokens[i].size());
} catch (std::range_error& msg) {
throw(1); // 2
}
try {
throw_positive(traceTokens[7].size());
} catch (std::range_error& msg) {
throw (9); // 3
}
}
}
```
Here, infer thinks that there are edges from 1->2 and 1-> 3. This should not be the case.
This in turn makes control analysis think that there is a back edge from 3->2 and violates the assertion that the exit node (3 in this case) must be a prune node...
Replacing assertion with internal error for now until I fix the clang frontend.
Reviewed By: skcho
Differential Revision: D25947376
fbshipit-source-id: 5c6529647
Summary:
Lambdas are essentially private (but are not marked as such in Infer),
so we should only report on their non-private callers.
Meanwhile, add a test to document that access propagation to those
callers is currently broken.
Reviewed By: da319
Differential Revision: D25944811
fbshipit-source-id: ef8ca6d9c
Summary:
This diff fixes a bug in the translation of an empty for-loop. When both initialization and
incrementation statements did not introduce a new node, the frontend generated an incorrect results
where the for-loop was unreachable from the entry node.
Fixes https://github.com/facebook/infer/issues/1374
Reviewed By: jvillard
Differential Revision: D25912142
fbshipit-source-id: 15b65cb84
Summary:
Previously, only names containing '$' were considered synthetic. We need
to extend the logic and look for "_UL_" in the name as well.
Also I deduped 4 different impls of "is_synthetic/generated/autogen".
Reviewed By: ngorogiannis
Differential Revision: D25899232
fbshipit-source-id: 9463eca6b
Summary:
When accessing a field or array offset of a pure variable (`Exp.Var`) that does not resolve to an access expression, `HilExp.of_sil` will create an extraneous dereference that causes `HilExp.get_typ` to fail. This pull request wraps variables that are the bases of Lfield or Lindex expressions with AddressOf before they're dereferenced (this is already done for Lvar inside `AccessExpression.of_pvar`) and adds a couple of unit tests that make sure it behaves as expected.
**More details on the bug:**
Given the following code:
```
if (!event_obj->dict)
```
and SIL:
```
n$6=_fun_gdb::ref_ptr<event_object,gdbpy_ref_policy<event_object>>::operator->(&event_obj:gdb::ref_ptr<event_object,gdbpy_ref_policy<event_object>>&) [line 38, column 8];
n$7=*n$6.dict:_object* [line 38, column 8];
PRUNE(!n$7, true); [line 38, column 8];
```
`operator->` has return type `event_object*`, but `n$6.dict` only has access to the type of the struct, `event_object`. `of_sil` [calls](9f98368e49/infer/src/absint/HilExp.ml (L567)) `access_expr_of_lhs_exp` with that type, which [calls](9f98368e49/infer/src/absint/HilExp.ml (L498)) `access_exprs_of_exp` (note that `add_deref` is always true). The Lfield case will then [recurse](9f98368e49/infer/src/absint/HilExp.ml (L469)) to process the Exp.Var, and `AccessExpression.of_id` will return an `AccessPath.base` that is then [dereferenced](9f98368e49/infer/src/absint/HilExp.ml (L440)). When resolving types, `get_typ` will find a non-pointer type wrapped by a `Dereference` and return [None](9f98368e49/infer/src/absint/HilExp.ml (L286)). To fix this, we match what [of_pvar](9f98368e49/infer/src/absint/HilExp.ml (L295)) does and wrap the base in an AddressOf, which is removed by the dereference.
Pull Request resolved: https://github.com/facebook/infer/pull/1372
Reviewed By: ngorogiannis
Differential Revision: D25803049
Pulled By: jvillard
fbshipit-source-id: ceadc8cad
Summary:
Pulse support for C languages ('clang') can now be considered
mature.
Reviewed By: ezgicicek, da319, jvillard
Differential Revision: D25803707
fbshipit-source-id: 5a48eb940
Summary:
When the body of the loop doesn't created a node then they don't get
wired correctly to the rest of the loop and end up dangling. Force node
creation to fix that.
Fixes https://github.com/facebook/infer/issues/1373
Reviewed By: ezgicicek
Differential Revision: D25804185
fbshipit-source-id: 85108bdd9
Summary:
We need to make sure a node is created to avoid instructions appearing
in the wrong order in the final CFG.
Reviewed By: da319
Differential Revision: D25784405
fbshipit-source-id: 3ef27d712
Summary:
Small model for a couple of StringUtils functions
Pull Request resolved: https://github.com/facebook/infer/pull/1346
Reviewed By: ngorogiannis
Differential Revision: D25638009
Pulled By: jvillard
fbshipit-source-id: 01db6d09e
Summary:
This sometimes happens and brings down all of infer with it. Just log
the error instead.
Fixes https://github.com/facebook/infer/issues/1338
Reviewed By: ezgicicek
Differential Revision: D25637821
fbshipit-source-id: 681207813
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:
The problem is that in `AnnotatedField.special_case_nullability` we
first check the _generic_ nullability and if it is `nonnullish` we
apply refinements for enums, synthetic fields, etc.
The problem is that the definition of `is_nonnullish` changed in
D25186043 (7dcbacf693) to a stricter one `UncheckedNonnull`, but generic
nullability stayed the same `ThirdPartyNonnull`.
Therefore enum elements were not considered `nonnullish` under
`--no-nullsafe-optimistic-third-party-in-default-mode` and the enum
refinements were not applied, which led to bogus errors.
**Example:**
There's a third-party enum
```
enum EnumClass {
ENUM_ELEMENT
}
```
`ENUM_ELEMENT` is represented as a private static field of
`EnumClass`.
Then we have first party code that does
```
EnumClass.ENUM_ELEMENT
```
If this first party class is not `Nullsafe` and the checker is ran
with `--no-nullsafe-optimistic-third-party-in-default-mode`, the user
gets an incorrect warning about `ENUM_ELEMENT` being unvetted third
party.
Reviewed By: ngorogiannis
Differential Revision: D25560119
fbshipit-source-id: 4ad0760c5
Summary: As per summary. Note that biabduction will make the results imprecise due to async exceptions from the timeout signal handler, so we warn when both are enabled (https://github.com/janestreet/memtrace/issues/2).
Reviewed By: jvillard
Differential Revision: D25219737
fbshipit-source-id: bdef228fc
Summary:
D25495343 (72a59553d2) mistakenly removed a rev_append and replaced it with @.
Fix that and rename the variable so that it's clearer it needs to be reversed.
Reviewed By: skcho
Differential Revision: D25558030
fbshipit-source-id: c66f477f2
Summary: using 'buck clean' rather than 'rm -rf buck-out' makes buck happier, apply to all buck integration tests
Reviewed By: ngorogiannis
Differential Revision: D25558469
fbshipit-source-id: 6c07341d6
Summary:
ndkbuild builds for all supported targets by default, giving errors
for clangs that doesn't support MIPS arch (which isn't relevant for this test).
Reviewed By: da319
Differential Revision: D25533986
fbshipit-source-id: 25c6001ce
Summary:
On centos8 devservers, this test failed on bizarre buck-out/tmp java.nio.file.NoSuch
FileException. I can't tell exactly what going on with rm -rf buck-out, but my guess would be that it puts the running buckd in a bad state.
using 'buck clean' rather than 'rm -rf buck-out' makes buck happier
Reviewed By: jvillard
Differential Revision: D25534471
fbshipit-source-id: 215f993e3
Summary:
First argument is a boolean and thus is always non-null, rather than
nullable.
Reviewed By: ngorogiannis
Differential Revision: D25532156
fbshipit-source-id: e334e0886
Summary:
Developers complain when a function that used to only throw an exception has complexity increase in the updated revision. Let's suppress such issues by giving those functions 0 cost which is already suppressed by differential reporting.
One common case to the above throw pattern is Java methods that throw an unsupported implementation exception for a functionality that has not been implemented yet. When the developer adds the supported implementation, we don't want to warn them with complexity increase since they are adding new functionality.
This is a design choice/heuristic to prevent noisy results for now.
Reviewed By: skcho
Differential Revision: D25495151
fbshipit-source-id: 94a82b062
Summary:
Avoid command-line-too-long for queries where the query expression itself is overly long.
Also, require the temporary filename prefix to ease debugging.
Reviewed By: jvillard
Differential Revision: D25495343
fbshipit-source-id: 0483aac2d
Summary:
First stab at quantifier elimination done poorly but fast :)
Easy one: when we know "x = y", and we want to keep x but not y, then
replace y by x everywhere.
Reviewed By: skcho
Differential Revision: D25432207
fbshipit-source-id: 81b142b96
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:
There was a bug where we forgot to mark these values as reachable. In
particular we would forget their arithmetic value as a result.
For example, now we remember that the array access is at an index equal
to 5 in the summary of this function:
```
foo(int a[]) {
a[5] = 42;
}
```
Reviewed By: skcho
Differential Revision: D25430468
fbshipit-source-id: 4acf09842
Summary:
I... kinda forgot about attributes in D25092158 (ab2813e355), which is probably why
impurity was angry that attributes were sometimes missing. Repare this
by adding together the attributes of all the values that are equal.
Reviewed By: skcho
Differential Revision: D25428405
fbshipit-source-id: e5d55b782
Summary:
Address a long-standing embarassing TODO in a minimal way: array indices
are values and when applying a summary we didn't actually bother
translating callee values to caller values. Fix that in a simple way by
just using the current mapping between callee and caller values and
otherwise freshen callee values to avoid clashes with caller values.
Reviewed By: ezgicicek
Differential Revision: D25424013
fbshipit-source-id: 03ca59b9f
Jules Villard
Martin Trojer
Ezgi Çiçek
Nikos Gorogiannis
Gabriela Cunha Sampaio
Joshua Selbo
Loc Le
Sungkeun Cho
Xiaoyu Liu
Daiva Naudziuniene
Artem Pianykh
Kevin Higgs
Luka Rahne
Franco Raimondi