Summary:
In order to test cost analysis results, currently we rely on having an arbitrary cost threshold (200) and report issues that exceed this cost. For instance, a cost of 201 is considered expensive and reported as `EXPENSIVE_EXECUTION_TIME` issue in cost tests.
This means, if we change the cost analysis in a slight way that results in some constant cost increase under 200, we wouldn't able to detect it. I find this unsatisfactory and somewhat hacky.
This diff adds the ability to write the result of `costs-report.json` into a separate `cost-issues.exp` and then compare the actual costs (not only than relying on this arbitrary threshold reporting mechanism).
Reviewed By: skcho
Differential Revision: D21816312
fbshipit-source-id: 93b531928
Summary: Add models for `View` methods that schedule on the UI thread.
Reviewed By: skcho
Differential Revision: D21767954
fbshipit-source-id: 015441ea7
Summary:
Android OS calls certain overridden class methods always on the UI thread. The function changed here attempted to build a list of all these methods, one by one. It's much more complete to simply consider a method as callable on the UI thread if it's an override of an Android library method, and it starts with "on". Only a single instance is known not to obey this pattern, so it's easier to blacklist than to whitelist.
Also clarify the name to `is_android_lifecycle_method`.
Reviewed By: ezgicicek
Differential Revision: D21703365
fbshipit-source-id: 41ca3e998
Summary:
I think `Analysis_stops` ought to achieve roughly the same thing (except
that weird filtering logic which I removed).
Reviewed By: dulmarod
Differential Revision: D21686562
fbshipit-source-id: 53d40729f
Summary: Assigning `nullptr` to `std::function` was causing `NULLPTR_DEREFERENCE` as our model was expecting to get an object in the right hand side of the assignment (`std::function::operator=`) and was dereferencing that object. Assigning `nullptr` to `std::function` removes callable object from it. We model this special case by creating a fresh value.
Reviewed By: skcho
Differential Revision: D21685318
fbshipit-source-id: 2d4af1933
Summary:
Introduce BIABD_ prefixes for a few issue types that were duplicated
between analyses, and also prefix the lab exercise issue type to avoid
sharing with biabduction.
Reviewed By: ngorogiannis
Differential Revision: D21660226
fbshipit-source-id: 3435916e6
Summary:
This seems to make sense as it's a separate analysis (that depends on
biabduction). This introduces unpleasant `|| is_checker_enabled TOPL`
whenever we try to figure out if biabduction will run. I think this is a
more general problem that deserves a more general solution to express
the fact that checkers can depend on others, so that, eg,
`is_checker_enabled Purity` is true when we pass `--loop-hoisting`. Will
address in another diff.
Reviewed By: ngorogiannis
Differential Revision: D21618460
fbshipit-source-id: 8b0c9a015
Summary: Later on, this can be changed again or made customizable.
Reviewed By: artempyanykh
Differential Revision: D21618730
fbshipit-source-id: fe517c766
Summary:
Start with tests about dynamic dispatch to test the upcoming
pre-analysis.
Reviewed By: ezgicicek
Differential Revision: D21594496
fbshipit-source-id: 1771ea968
Summary:
This function had been computing the name for ObjC methods wrong, with only the class name. This was causing wrong error messages in Pulse.
The main issue was that `Procname.to_simplified_string` was writing `Classname::methodname` for ObjC methods, which is not the convention. This confused the `hashable_name` funtion. So changing the method name to `Classname.methodname` which is more standard, and this also fixes `hashable_name`.
Reviewed By: ngorogiannis, jvillard
Differential Revision: D21570880
fbshipit-source-id: 13ed62cf8
Summary: In an intra-procedural analysis, we assume that parameters passed by reference to a function will be initialized inside that function. To do that we use the type information of a formal parameter to initialize the fields of the struct. This was causing false positives if the formal parameter in function signature had type `void*`. To solve this, we used type information from local variables instead. However, we also get false positives for any kind of pointer if we use cast. We fix this by using type information of local variables as in `void*` case.
Reviewed By: jvillard
Differential Revision: D21522979
fbshipit-source-id: 4222ff134
Summary:
Previous translation of enum constants were wrong since they assumed that the enum constant didn't include any global variable (hence they just looked up the enum exp from the map, forgetting to tie the respective instructions into the cfg).
```
const int gvar = 0;
enum {
evar = gvar,
};
int dangling() {
return evar;
}
```
as a result, the CFG was missing the instruction for the load of the `gvar`.
{F237004587}
This diff fixes this issue by hooking up the instructions that load the enum constant in to the CFG. Note that in this example, it is only a load instruction but there could be more instructions (e.g. if we had `gvar > 1`, we would have prune +join).
{F237004493}
Reviewed By: ezgicicek
Differential Revision: D21549781
fbshipit-source-id: 525534fb2
Summary:
Just like `CFBridgingRelease` we want to be able to model functions that are specific to a given codebase that make a transfer of memory ownership so that developers don't need to worry about releasing that memory anymore, and hence, we don't want to report leaks on that memory.
Things get a little more complicated, because some of the functions we want to model are in a specific namespace, so with this flag we take both cases into account, when we are dealing with namespaces or not.
Reviewed By: jvillard
Differential Revision: D21404409
fbshipit-source-id: c36bd7afc
Summary: Currently we get false positive if we apply `operator--` to the `end()` iterator. To solve this, we model iterator `operator--` not to raise an error for the `EndIterator` invalidation, but to create a fresh element in the underlying array.
Reviewed By: ezgicicek
Differential Revision: D21476353
fbshipit-source-id: 5c722372e
Summary:
It is undefined behavior to dereference end iterator.
To catch end iterator dereferencing issues we change iterator model: instead of having `internal pointer` storing the current index, we model it as a pointer to a current index. This allows us to model `end()` iterator as having an invalid pointer and there is no need to create an invalidated element in the vector itself.
Reviewed By: ezgicicek
Differential Revision: D21178441
fbshipit-source-id: fd6a94b0b
Summary: We mistakenly invalidated the set element which causes spurious vector invalidation errors. Instead, we should modify it without any invalidation.
Reviewed By: jvillard
Differential Revision: D21521943
fbshipit-source-id: 67963967e
Summary:
This diff adds semantics of assume null, heuristics. When `assume(x == null)`, it removes the
methods called on the builder `*x` from the abstract state.
```
x -> {p}
p -> {method1 called}
assume(x == null)
x -> {p}
```
This heuristics is unsound: Even though `x` (a pointer to builder object) points-to an builder
object, which cannot imply that the object `p` does not exist in the concrete semantics. The
unsoundness may appear when there is an alias (see the FP test added).
Reviewed By: ezgicicek
Differential Revision: D21502923
fbshipit-source-id: 2e392bd89
Summary: Java's iterator models were wrong. This causes `VECTOR_INVALIDATION` errors in fbandroid projects. This diff aims to fix it by modeling Java iterators with a current pointer and an underlying collection array.
Reviewed By: skcho
Differential Revision: D21448322
fbshipit-source-id: 7d44354b5
Summary:
These 2 methods are automatically supplied for all enums, with
predefined behavior and nullability: https://www.geeksforgeeks.org/enum-in-java/
(Note that they are not part of java.lang.Enum class).
This will allow using them in unvetted third part and under strict mode.
Reviewed By: artempyanykh
Differential Revision: D21501716
fbshipit-source-id: 104082d15
Summary:
Because in the real semantics CFRelease can be used more than once, and also the variables can be used after CFRelease in general, modelling this as `free` causes many `USE_AFTER_FREE` errors. Now we change the model to not add the `Invalid CFree` attribute, but to just remove the `Allocated` attribute. So we can model memory leaks in the simple case of `Create` and not `CFRelease` before going out of scope, but we avoid the `USE_AFTER_FREE`.
Since the model for CFRelease now diverges from free, changed the command line option for modelling to `pulse-model-release-pattern`.
Reviewed By: jvillard
Differential Revision: D21324895
fbshipit-source-id: ab323d981
Summary: The contract for reporting races in C++ is to flag races between writes under lock with reads without a lock. This diff restores that contract which had been violated by recent changes.
Reviewed By: jberdine
Differential Revision: D21383876
fbshipit-source-id: 6a84e1506
Summary:
This diff changes way we treat classes w.r.t. to Nullsafe modes when
issuing meta-issues.
Previously, we considered nested class independently of the outer one.
This was leading to a tricky case: when the class is clean but nested
class needs fixing, meta-info told that class can be Nullsafe.
This is counter-intutive and lead to problems when users tried to follow
wrong nullsafe suggestions for this case.
After this diff we:
1. Start calculating meta-issues only on the outermost level. This will simplify
reasoning about nullsafe stats.
2. Aggregate all nested issues counters to corresponding outer-level class.
Among others, CLASS_CAN_BE_NULLSAFE Advice will finally become
actionable in all known cases.
Reviewed By: artempyanykh
Differential Revision: D21353607
fbshipit-source-id: a17c6958a
Summary:
List of things happening in this unreviewable diff:
- moved PulsePathCondition to PulseSledge
- renamed --pulse-path-conditions to --pudge
- PulsePathCondition now contains all the arithmetic of pulse
(inferbo+concrete intervals+pudge). In particular, moved arithmetic
attributes into PulsePathCondition.t. PulsePathCondition plays the
role of PulseArithmetic (combining all domains).
- added tests for a false positive involving free()
- PulseArithmetic is now just a thin wrapper around PulsePathCondition
to operate on states directly (instead of on path conditions).
- The rest is mostly moving code into PulsePathCondition (eg, from
PulseInterproc) and adjusting it.
Reviewed By: jberdine
Differential Revision: D21332073
fbshipit-source-id: 184c8e0a9
Summary:
We have a common entry point where we skip analysis in nullsafe.
This logic is copied from `Reporting.log_issue_from_summary`.
I believe this should not exist in Reporting: it is not the right place
to decide whether to suppress issues: we should not try to report it in
first place.
Because of that we falsely report "needs improvement" meta-issue while
we don't issue any (they were suppressed but participated in needs
improvement count calculations).
Now this change will make meta-issue to be synced with what the user
actually sees.
Down the line we should have a more reliable fix for that.
So far I reviewed suppressing code and looks like we should not suppress
anything else (unless explicitly SuppressLint-ed, which is fine).
Reviewed By: artempyanykh
Differential Revision: D21328634
fbshipit-source-id: 120ce06d1
Summary:
Add a new data structure and use it for the map of memory accesses to
limit the number of destinations reachable from a given address. This
avoids remembering details of each index in large arrays, or even each
field in large structs.
Reviewed By: skcho
Differential Revision: D18246091
fbshipit-source-id: 5d3974d9c
Summary:
The C++ tests were a bit of a mess. This diff tries to enforce the following principles:
- mark every function with `_ok` or `_bad` so that when a function appears in `issues.exp` it's easy to figure out the intention;
- mark every false negative and positive with `FP_` and `FN_` to document expectations;
- make every function access one field and participate in at most one issue report so that it's easier to assess changes.
Reviewed By: jvillard
Differential Revision: D21278627
fbshipit-source-id: 9698f716f
Summary:
We were invalidating "*(vec.__infer_backing_array)" instead of the
address of the field itself.
Reviewed By: ezgicicek
Differential Revision: D21280357
fbshipit-source-id: 48b984800
Summary:
The directory was created to have several sets of nullsafe tests but
there is only one in the end. Remove the redundant "-default".
Reviewed By: mityal
Differential Revision: D21300205
fbshipit-source-id: 46ed8b032
Summary:
The directory names had some interesting variety due to historical
reasons.
- {c,cpp,objc,objcpp}/errors/ date from the time when infer was only
biabduction
- java/infer/ dates from the time when we had an "--analyzer" option and
"infer" was one of them (sic), and eg another was "eradicate".
- c/biabduction/ dates from the time when the biabduction analysis was
being migrated to the "checkers" (AI) framework. For some reasons the
tests there are not a subset of c/infer/ but seem to be entirely new
tests.
The convention now dictates that we should name all of these
*/biabduction/. This diff moves the existing tests from c/biabduction/
into c/biabduction/misc/.
Reviewed By: mityal
Differential Revision: D21300147
fbshipit-source-id: 516d1cb15
Summary: We currently don't support abducing the spec that we need to delete an attribute, that makes the model for `CFBridgingRelease` work les well when it is, for instance, wrapped in a method. We show examples of how this doesn't work at the moment.
Reviewed By: jvillard
Differential Revision: D21176108
fbshipit-source-id: 79aed7a5d
Summary:
We model `malloc` in Objective-C as `malloc_not_fail` I think because the null case is not normally handled in iOS apps because the OS will just killed the app after giving some memory warnings.
So adding `malloc_not_fail` model to Pulse.
Reviewed By: jvillard
Differential Revision: D21278527
fbshipit-source-id: 17a5008fe
Summary:
This translates the construct `ObjCBridgedCastExpr` when the cast_kind is `OBC_BridgeTransfer`, or in syntax, the cast (`__bridge_transfer`).
This cast means that the object is passed from manual memory management to ARC, so one doesn't need to call `release` manually. It is important to model this to avoid false positives.
It translates it as a builtin that we then model in Pulse, the same way we modelled `CFBridgingRelease` which does the same thing.
The name of the builtin is `__free_cf` which is not ideal but I left it like that for compatibility with biabduction. We can change it once we remove this check from biabduction.
update-submodule: facebook-clang-plugins
Reviewed By: jvillard
Differential Revision: D21176337
fbshipit-source-id: 736ceeb9b
Summary:
In the previous diffs, nullsafe behavior was changed to the following:
nested class mode is inherited from the outer class mode.
Though it is possible to e.g. make nested class Nullsafe and outer not,
or make nested class STRICT and outer just LOCAL, this is an edge case
and we don't want to recommend annotating nested classes by default. The
right way is to make outer class Nullsafe instead.
In this decision, we take into account user experience and codebase
readability.
Reviewed By: ngorogiannis
Differential Revision: D21255806
fbshipit-source-id: 0200cb555
Summary:
With this change, set of possibilities will be more actionable. Most
importantly, this will also educate users and make them realize how
Nullsafe trust works.
NOTE: yes, parenthesis are bit clumsy, but it was the easiest way to
make this change and let the phrase remain grammatically correct.
Reviewed By: artempyanykh
Differential Revision: D21231468
fbshipit-source-id: 4b5349fb5
Summary:
In the previous diff we changed the semantics of nested classes w.r.t.
to Nullsafe.
Let's make it clear if users will attempt to misuse it.
Reviewed By: artempyanykh
Differential Revision: D21230717
fbshipit-source-id: 0ecc0dd06
Summary: Similarly to Enum.name, we model Class.getCanonicalName as returning an arbitrary non-empty string.
Reviewed By: ngorogiannis
Differential Revision: D21207120
fbshipit-source-id: 1e2dbd1fd
Summary:
From the user perspective, the current behavior is confusing.
The users intutitively expect the inner class to inherit Nullsafe mode
from the outer one.
Having a class that is Nullsafe but the inner is not is hence dangerous
and misleading.
For the sake of completeness and to support gradual strictification, we
allow the nested class to improse additional strictness. Particularly,
the inner class can be Nullsafe but the outer can be not.
A follow up to this diff will include warnings telling about redundant and wrong usages of nested annotations.
Reviewed By: artempyanykh
Differential Revision: D21228055
fbshipit-source-id: 75755ad1d
Summary: Iterator invalidation traces were based on vector rather than iterator itself.
Reviewed By: ezgicicek
Differential Revision: D21202047
fbshipit-source-id: 62ce8a488
Summary:
We model Enum.name as returing a constant name, rather than getting real field names. We did this
because we couldn't think of any big gains, in terms of analysis precision/performance, from getting
the real names.
Reviewed By: ezgicicek
Differential Revision: D21201730
fbshipit-source-id: a2dc01a44
Summary: This diff revises the models of Collection.set and get to handle its elements.
Reviewed By: ezgicicek
Differential Revision: D21201242
fbshipit-source-id: 9c248453d
Summary:
We ignored allocator models for vectors, and were not able to initialize vectors properly. This diff fixes this issue.
It also adds a test which was a FN before.
Reviewed By: skcho, jvillard
Differential Revision: D21089492
fbshipit-source-id: 6906cd1d1
Summary: D21155014 replaced `skip` call with a Load but this was not right. Instead, let's add a new builtin function (rather than skip) so that other analyses can freely model it as they want.
Reviewed By: jvillard
Differential Revision: D21178286
fbshipit-source-id: c214ccfb0
Summary: Java has this pattern of wrapping non-thread-safe containers in factory methods producing identically-typed results, but wrapped in a synchronised shell. This diff teaches RacerD about some common factory methods and uses the attribute domain to track the dynamic type of their results.
Reviewed By: ezgicicek
Differential Revision: D21155538
fbshipit-source-id: 42ebe6251
Summary: Complete the set of models for java containers that Infer should not report thread safety violations.
Reviewed By: ezgicicek
Differential Revision: D21138280
fbshipit-source-id: 01e1944b6
Ezgi Çiçek
Nikos Gorogiannis
Jules Villard
Daiva Naudziuniene
Dulma Churchill
David Pichardie
Mitya Lyubarskiy
Sungkeun Cho