Summary:
Update from dune 1 to dune 2. The change was mostly straightforward
except that change to (modes ...) default to exe only was somewhat
unexpected.
Anyhow, with the community moving to dune 2 it's good to keep up.
Reviewed By: ngorogiannis
Differential Revision: D19605895
fbshipit-source-id: 1f9830de8
Summary: This will be eventually used in RacerD. Further diffs up the stack will migrate away the starvation-specific aspects.
Reviewed By: ezgicicek
Differential Revision: D19623392
fbshipit-source-id: a72650718
Summary:
Prevent returning a negative cost bound when calling `substring(begin_index, end_index)` when either is possible
- `begin_index < 0`
- `begin_index > end_index`
Instead, return unit cost since such cases either throw `IndexOutOfBoundsException ` at runtime or correspond to having two symbolic bounds that cannot be semantically compared.
Reviewed By: dulmarod
Differential Revision: D19619410
fbshipit-source-id: cf5e8cb7b
Summary:
The "access path" memory model (equal access paths iff equal object addresses) is suited to when aliasing occurs only at the roots (i.e. variables). When there is intentional aliasing in the middle of an access path, this model will miss the aliasing. For instance if `[x.f] == [y.g]`, then also `[x.f.h] == [y.g.h]`, but the latter access paths are unequal.
In Java, non-static inner classes consistently alias `this.this$0` inside an inner class, which points to the "parent" outer-class object. So if two inner-class objects (belonging to different inner classes) access `this(type:InnerClassA).this$0.f` and `this(type:InnerClassB).this$0.f` the equality will be missed (many other combinations exist). This isn't strictly due to the memory model -- any alias analysis would have to do some class invariant inference to detect this.
For this purpose `AccessPath.inner_class_normalize` exists (it replaces `this.this$0` with `this` of the appropriate type), but this breaks the invariant that we know which formal parameter is at the root (there may not even exist a `this` parameter if the method is static). So this was buggy.
Here we simply recursively remove the synthetic field prefix of the accesses list, while computing forwards the object type. This is only applied when we check aliasing across threads. This will also allow actuals/parameters substitutions (stacked diff) which normalisation was breaking.
Reviewed By: jberdine
Differential Revision: D19601455
fbshipit-source-id: 7e42667b6
Summary:
Rename DeclaredNonnull -> UncheckedNonnull, Nonnull -> StrictNonnull.
This is a preparatory step to introduce one more nullability option,
specifically CheckedNonnull to support local nullsafe mode.
Reviewed By: ngorogiannis, mityal
Differential Revision: D19619289
fbshipit-source-id: 12a3ff814
Summary:
This will help adoption of non-transitive strictification modes.
The main use-case we are aiming with this function is:
- During strictification, a method is made nullable, but it is not feasible to fix all
callers straight away. Suppressing nullsafe with an appropriate task or
comment will make it easier to unblock the strictification and move
forward.
Reviewed By: artempyanykh
Differential Revision: D19599098
fbshipit-source-id: 3769bbd3d
Summary:
1. I can not imagine a useful usecase for strict node, lets not
complicate the code.
2. Add docs.
Reviewed By: artempyanykh
Differential Revision: D19599091
fbshipit-source-id: 1d37a717f
Summary:
Reorder assertNotNull and assumeNotNull:
1. More useful methods go first.
2. More useful methods explicitly recommended over less useful.
Reviewed By: artempyanykh
Differential Revision: D19599084
fbshipit-source-id: 1b9ad9ef6
Summary: The translation of closures includes a load instruction for the captured variable, then we add that corresponding id to the closure. This doesn't correspond to an actual "use" of the captured variable in the source program though, and causes false positives. Here we remove the ids from the domain when that id is being added to a closure.
Reviewed By: ngorogiannis
Differential Revision: D19557352
fbshipit-source-id: 52b426011
Summary:
- Add `Nullsafe` annotation as a general mechanism to specify
type-checking behaviour for nullsafe.
- Document annotation params and provide usage examples with
explanations.
- Add tests to demonstrate the behaviour with different type-checking
modes.
No implementation is added. This diff serves as an RFC to hash out the
details before I dive into code.
Reviewed By: ngorogiannis
Differential Revision: D19578329
fbshipit-source-id: b1a9f6162
Summary: Keep the type name of the class as the key in the map constructed from class names to their methods in a file. This will be used later, and also why string?
Reviewed By: dulmarod
Differential Revision: D19557707
fbshipit-source-id: aa8569581
Summary: D19496263 had refactored cost to its own subdirectory. In this process, it introduced a perf degradation by bundling of collection and computation of constraints which relies on imperative union find. This diff fixes that by separating them.
Reviewed By: ngorogiannis
Differential Revision: D19598610
fbshipit-source-id: 0e466522d
Summary: Add the interface that will be used to lock Procedures.
Reviewed By: ngorogiannis
Differential Revision: D19580578
fbshipit-source-id: b5e334b18
Summary: `String.split(regexp)` returns an array that is split by the given regexp. If the regexp doesn't match, the original string is returned. Hence, the resulting array's length must be in `[1, max(1, n_u -1)]` where`n_u` is the upper bound of the string's length.
Reviewed By: dulmarod
Differential Revision: D19578318
fbshipit-source-id: 675af7376
Summary:
Adding a new check as part of the SelfInBlock checker, for cases when a strong pointer to self, that is not self, is captured in the block.
This will cover the following wrong scenarios:
1. strongSelf is a local variable in a block as it should be, and then it's used in a sub-block, in which case it's a captured variable.
2. weakSelf is defined without the weak attribute by mistake.
Reviewed By: ngorogiannis
Differential Revision: D19538036
fbshipit-source-id: 151871745
Summary:
In practice, condition redundant is extremely noisy and low-signal
warning (hence it is turned off by default).
This diff does minor tweaks, without the intention to change anything
substantially:
1/ Change severity to advice
2/ Change "is" to "might be"
3/ Describe the reason in case the origin comes from a method.
The short term motivation is to use 3/ for specific use-case: running nullsafe on codebase and
identify most suspicious functions (that are not annotated by often
compared with null).
Reviewed By: artempyanykh
Differential Revision: D19553571
fbshipit-source-id: 2b43ea0af
Summary:
This is/can be useful for future changes that make the reporting more
precise based on the exact origin.
See the follow up diff as an example.
Reviewed By: artempyanykh
Differential Revision: D19553567
fbshipit-source-id: c2b2c28a1
Summary: Currently, empty summaries are passed to the cluster callbacks. This is pointless and could potentially lead to recomputing already analysed summaries. This change passes only procnames to the callback, and `Ondemand` is used to load the summary or analyse as needed.
Reviewed By: jvillard
Differential Revision: D19544043
fbshipit-source-id: 28ab642c3
Summary: There is no need to provide type environments to cluster analysers, since the execution environment can be used to retrieve those on demand.
Reviewed By: jvillard
Differential Revision: D19543561
fbshipit-source-id: f9b064011
Summary: We were reporting strongSelf Not Checked when the variable was checked in a conditional, this diff fixes that.
Reviewed By: jvillard
Differential Revision: D19535943
fbshipit-source-id: f8e64e1b7
Summary: I noticed when looking into a false positive of strongSelf Not Checked, that there were some inconsistencies in the translation of if statements with an and, with an extra redundant join only if using a method in the condition that returned an object. So I could repro the problem and investigate and found the place of the inconsistency in the translation. This diff fixes it without changing things too much.
Reviewed By: jvillard
Differential Revision: D19518368
fbshipit-source-id: 47a6a778c
Summary:
The order by which the scheduler visits odd and even methods here
will determine if there is any report at all. This is a bad test
so remove.
Reviewed By: fgasperij
Differential Revision: D19535537
fbshipit-source-id: 6b64b0de9
Summary: Adding reporting to strongSelf Not Checked when strongSelf is passed to a method in a not explicitly nullable position.
Reviewed By: ezgicicek
Differential Revision: D19330872
fbshipit-source-id: 95871a70a
Summary: After receiving feedback about this, I'm changing the reporting of strongSelf Not Checked to only in cases where it can cause a crash. Here I'm adding reporting for field access, and removing general reporting. In a next diff, I'll also add reporting for passing strongSelf to methods in not explicitly nullable positions.
Reviewed By: skcho
Differential Revision: D19329842
fbshipit-source-id: 35beb2aa3
Summary:
The RestartScheduler needs to know if the worker finished it's task
because:
1. there was no more work to do or
2. found that a needed Procname was already taken (this part is not yet implemented)
This need was addressed by (i) making the functions that the workers execute
return a value of task_result.t intead of unit and (ii) adding a
constructor to the worker_message.t (FinishedTask).
Reviewed By: ngorogiannis
Differential Revision: D19467783
fbshipit-source-id: a76b02b6c
Summary:
1. One should use either a writer or a stream to send a response, but not both.
2. A response should be forwarded only if it was commited.
Both properties are extracted from API comments on classes in the servlet API.
Reviewed By: jvillard
Differential Revision: D19514568
fbshipit-source-id: 79f0257ed
Summary:
If data comes from an outer OutputStream, then this outer OutputStream
needs to be flushed before getting the byte array.
Reviewed By: jvillard
Differential Revision: D19514569
fbshipit-source-id: e3e025394
Summary: We were lacking this kind of test where one interface refines the nullability of the other.
Reviewed By: ngorogiannis
Differential Revision: D19514245
fbshipit-source-id: fa3e781f3
Summary: `cost.ml` is huge. Let's split it to its logical parts (basically creating new files for the modules that were already in `cost.ml`) and move all cost related files into `\cost` directory. While we are at it, let's add `mli` files too.
Reviewed By: jvillard
Differential Revision: D19496263
fbshipit-source-id: 45096db4c
Summary: Deadlocks often result in two reports if not deduplicated (two traces), so there is some logic for doing that. Locks recently became an opaque type, with the `get_access_path` loophole supporting that deduplication ordering. Fix that here and remove `Lock.get_access_path`.
Reviewed By: jvillard
Differential Revision: D19465223
fbshipit-source-id: b597e3c65
Summary:
This is a common enough case to make error message specific.
Also let's ensure it's modelled.
Reviewed By: artempyanykh
Differential Revision: D19431899
fbshipit-source-id: f34459cb3
Summary:
The previous diff changes the message for params case, this one handles
return.
Reviewed By: artempyanykh
Differential Revision: D19430706
fbshipit-source-id: f897f0e56
Summary:
This diff gets global constant array values from their initializers. The `find_global_array` function is
added to memory domain, which finds values of global array locations during the ondemand value
generation.
Reviewed By: ngorogiannis
Differential Revision: D19300143
fbshipit-source-id: 7b0b84c42
Summary: Use more informative method names, and add comments explaining the logic behind each test. Correct two cases which are FPs instead of legitimate reports.
Reviewed By: artempyanykh
Differential Revision: D19465227
fbshipit-source-id: 29332e2b9
Summary: Change `MayBlock` and `StrictModeCall` constructors from taking a string to a `Procname.t`, which was the sole source of that string anyway.
Reviewed By: ezgicicek
Differential Revision: D19465226
fbshipit-source-id: e3ed6ef88
Summary:
If a race exists in two or more overloads of the same method and we use only the class and method name in the report text, then the current bug hashing algorithm will identify the two reports as duplicates.
To avoid this, the report had the class, method and list of type parameters. This is unreadable, however, and redundant (the report is already located within the method in question). So at the risk of duplicates, use only class+method names.
Also, fix a bug in `Procname.pp_simplified ~withclass` where `withclass` was ignored for C++/ObjC methods.
Now:
> Read/Write race. Non-private method `FrescoVitoImageSpec.onCreateInitialState(...)` indirectly reads with synchronization from `factory.AnimatedFactoryProvider.sImpl`. Potentially races with unsynchronized write in method `FrescoVitoImageSpec.onEnteredWorkingRange(...)`.@ [Litho components are required to be thread safe because of multi-threaded layout](https://fburl.com/background-layout). Reporting because current class is annotated `MountSpec`, so we assume that this method can run in parallel with other non-private methods in the class (including itself).
Before
> Read/Write race. Non-private method `void FrescoVitoImageSpec.onCreateInitialState(ComponentContext,StateValue,StateValue,Uri,MultiUri,ImageOptions,FrescoContext,Object,ImageListener)` indirectly reads with synchronization from `factory.AnimatedFactoryProvider.sImpl`. Potentially races with unsynchronized write in method `FrescoVitoImageSpec.onEnteredWorkingRange(...)`.@ [Litho components are required to be thread safe because of multi-threaded layout](https://fburl.com/background-layout). Reporting because current class is annotated `MountSpec`, so we assume that this method can run in parallel with other non-private methods in the class (including itself).
Reviewed By: artempyanykh
Differential Revision: D19462277
fbshipit-source-id: aebc20d89
Summary:
Currently, impurity analysis is oblivious to skipped functions which might e.g. return a non-deterministic value, write to memory or have some other side-effect. This diff fixes that by relying on Pulse's skipped functions to determine impurity. Any unknown function which is not modeled to be pure is assumed to be impure.
This is a heuristic. We could have assumed them to be pure by default as well.
Reviewed By: jvillard
Differential Revision: D19428514
fbshipit-source-id: 82efe04f9
Summary:
Let's collect the list of all skipped functions with a `proc_name` but no summary in Pulse's memory. This will be useful for the impurity analysis later (next diff).
Concretely, we extend Pulse's domain with a map from skipped calls to their respective traces. For efficiency, we only keep a single trace per skipped call.
For impurity analysis, tracking skipped calls in Pulse allows us to rely on Pulse's strong memory model to get rid of infeasible paths as opposed to creating an independent checker which wouldn't be able to do that.
Reviewed By: jvillard
Differential Revision: D19428426
fbshipit-source-id: 3c5e482c5
Summary:
As suggested by Ilya, the current message can be improved in a way that
it can contain more clear action. I also added artempyanykh's explanation at the
end of message to provide an additional justification from common sense
perspective.
But most importantly, the previous message was missing a space which is
eye bleeding, how come haven't I noticed this before, I can't stand it
OMG.
Reviewed By: artempyanykh
Differential Revision: D19430271
fbshipit-source-id: dd31f7adb
Summary:
Inferbo analyzed some program points unreachable incorrectly, because of unsound semantics of band
operator, which did not handle the case when given parameters are pointer values.
Reviewed By: ngorogiannis
Differential Revision: D19392705
fbshipit-source-id: dd590508c
Summary:
This diff revises the generation of unknown value. If the type of the unknown value generating is
int, it does not add the "Unknown" pointer/array value.
Reviewed By: ngorogiannis
Differential Revision: D19392696
fbshipit-source-id: e1b3c9a3a
Summary: In impurity analysis, pick up the pulse summary rather than re-analyzing. Re-order the checkers so that we first analyze pulse.
Reviewed By: jvillard
Differential Revision: D19448296
fbshipit-source-id: 2987fa848
Summary:
This diffs does: (1) move `get_formals` to `BufferOverrunUtils` (2) use separate `get_formals` in
`BufferOverrunChecker`, in order to simplify the following diff.
Reviewed By: jvillard
Differential Revision: D19432280
fbshipit-source-id: bfb4df118
Summary:
The restart scheduler will now have two phases:
1. Analyze all the procs obtained from the sources.
2. Run the FileScheduler on the sources.
The second step aims to analyze only the File level analyzers
requirements.
Reviewed By: ngorogiannis
Differential Revision: D19430244
fbshipit-source-id: b4f9ee69b
Summary: `dune build check` will compile all the ml files much quicker than `dune build`
Reviewed By: jvillard
Differential Revision: D19427864
fbshipit-source-id: 5221d32bc
Summary:
Introduce a new notion of equality for comparing abstract addresses in distinct threads:
```
(** Abstract address for a lock. There are two notions of equality:
- Equality for comparing two addresses within the same thread/process/trace. Under this,
identical globals and identical class objects compare equal. Locks represented by access paths
rooted at method parameters must have equal access paths to compare equal. Paths rooted at
locals are ignored.
- Equality for comparing two addresses in two distinct threads/traces. Globals and class objects
are compared in the same way, but locks represented by access paths rooted at parameters need
only have equal access lists (ie [x.f.g == y.f.g]). This allows demonically aliasing
parameters in *distinct* threads. This relation is used in [may_deadlock]. *)
```
Reviewed By: skcho
Differential Revision: D19347307
fbshipit-source-id: 9f338731b
Summary:
This diff avoids that `array_sizeof` returns bottom value when given Java enum values, which
introduced unreachable code inadvertently.
Reviewed By: ngorogiannis
Differential Revision: D19409077
fbshipit-source-id: 2816fd995
Summary: Access expressions can appear in casts, or sometimes other constructors, inside a `HilExp.t`. Extraction of the access expression can ignore those wrappers. Introduce a single function for doing that throughout the analyser.
Reviewed By: ezgicicek
Differential Revision: D19410673
fbshipit-source-id: a724cb466
Summary:
The property SkipAfterRemove already had a test, but not for
intra-procedural violations. This adds a test for that case.
Reviewed By: ngorogiannis
Differential Revision: D19330471
fbshipit-source-id: 1dd1c3ad7
Summary:
Now we can either disable it, or enable it only.
For integrations that disable it, this will allow to enable it for
NullsafeStrict classes without enabled it fully
Reviewed By: artempyanykh
Differential Revision: D19409131
fbshipit-source-id: a2b1fe650
Summary: This diff implements this for Field Not Initialized check
Reviewed By: artempyanykh
Differential Revision: D19393989
fbshipit-source-id: cf60e8d53
Summary: add subdirectories so that we can run each java file against its own topl properties
Reviewed By: rgrig
Differential Revision: D19347302
fbshipit-source-id: 562830774
Summary:
This diff does it for nullable dereference and assignment violations
rules which happen under NullsafeStrict case.
Follow up are to make the same for inheritance and field initializer
violations.
Possible follow up includes making error message more specific and
articulare this this is a nullsafe strict mode.
Reviewed By: artempyanykh
Differential Revision: D19392916
fbshipit-source-id: 2554ac7a7
Summary: In whole-program mode, analysing a method requires analysing first all constructors of the same class. This is not needed in normal mode, so gate that computation under `starvation_whole_program` for efficiency.
Reviewed By: artempyanykh
Differential Revision: D19393412
fbshipit-source-id: 2277e6b5e
Summary:
The RestartScheduler now uses it's own of_list function to build a
ProcessPool.TaskGenerator to be able to use a queue as the underlying
data structure.
Reviewed By: ngorogiannis
Differential Revision: D19390055
fbshipit-source-id: d57b493b7
Summary:
Previously, _override resolution_ considered only the number of
arguments. This led to many FPs in nullsafe's _Inconsistent Subclass
Annotation_ check.
Current version also checks that argument types match. However, we
still don't handle type parameters and erasure, so in this sense the
rules are incomplete.
Reviewed By: ngorogiannis, mityal
Differential Revision: D19393201
fbshipit-source-id: a0c75b8dd
Summary:
That was used only by the now-defunct Java Buck integration without
genrules.
Reviewed By: ngorogiannis
Differential Revision: D19176545
fbshipit-source-id: 8253b614a
Summary:
You should use `--buck-java` instead, which uses the new "genrule
master" integration.
This diff makes it impossible to select the previous integration.
Upcoming diffs will clean up the resulting dead code.
This also make infer fail hard when no buck mode is specified in a buck
capture command, eg `infer -- buck build //foo:foo`. The reason is that
we need to choose between 3 incompatible integrations and making any of
them the default will confuse at least one person in the future.
Reviewed By: ngorogiannis
Differential Revision: D19176391
fbshipit-source-id: 707d18b50
Summary:
These changes introduce the RestartScheduler which for now is a copy of the FileScheduler:
- added it as a possible argument to the recently added `--scheduler` option.
- made the necessary changes in `InferAnalyze` to call it if it was chosen.
Reviewed By: ngorogiannis
Differential Revision: D19373505
fbshipit-source-id: 98f065057
Summary:
`diff` by default doesn't colorize its output, while `git diff`
does. Since we already depend on git it seems like a safe change and
brings some quality of life improvement while working with tests.
Reviewed By: ngorogiannis
Differential Revision: D19374691
fbshipit-source-id: 8872b527c
Summary:
`infer/tests/infer.make` unconditionally runs
```
$(call check_no_duplicates,$(INFER_OUT)/duplicates.txt)
```
as a part of `test` target. This requires the flag to be set to
produce `duplicates.txt`.
`clang.make` does this, but `java.make` was missing the flag which led
to an error on running `make tests` within
e.g. `tests/codetoanalyze/java/nullsafe-default`:
```
grep: infer-out/duplicates.txt: No such file or directory
```
Reviewed By: mityal
Differential Revision: D19373857
fbshipit-source-id: c2fcbe9dd
Summary:
This diff avoids that null-retuned path's abstract value ruins that of non-null-returned path.
What this diff does is: when joining two abstract states, one is null-return-path and the other is
non-null-return-path (`return obj;`), it keeps the method calls of `obj` from the
non-null-return-path.
While this design is unsound, I think it should work in practice.
Reviewed By: ezgicicek
Differential Revision: D19348313
fbshipit-source-id: cf5d0f3ff
Summary: This diff captures global initializers ondemand, like we do for functions defined in headers.
Reviewed By: ezgicicek
Differential Revision: D19346947
fbshipit-source-id: 05174e6a4
Summary: The type-name definition for Java can be potentially improved (eg increase sharing, or comparison speed, much like `QualifiedCppName`) by switching away from `Mangled.t` which is essentially a string. First step is to abstract the type.
Reviewed By: jberdine
Differential Revision: D19087508
fbshipit-source-id: 91a81f63b
Summary: Now that we have the kind of lock stored (global/class obj/path rooted at parameter), use it for comparison/equality, while ignoring the root variable of the access path, which is only used for printing.
Reviewed By: skcho
Differential Revision: D19346801
fbshipit-source-id: c65661dc6
Summary: Add command line option that directs racerd to treat all return values from unknown code (including abstract methods) as owned objects. This is essentially treating return values with full angelicism
Reviewed By: artempyanykh
Differential Revision: D19368375
fbshipit-source-id: 6a10153fa
Summary:
Java treats switch on nullables in a non-obvious way (throws an NPE
surprise) so lets have a decidated test exactly for this.
Reviewed By: ngorogiannis
Differential Revision: D19371280
fbshipit-source-id: d9867b6d6
Summary:
As part of enabling substitution of arguments into lock names in summaries, and potentially changing the equality relation over locks (so that we can eventually make equal `x.f.g` and `this.f.g` for example), the lock type needs to be elaborated so that the root of an access path is classified into:
- global variables are clearly separated from all other classes (invariant to substitution)
- class objects are also separate (also invariant, but identified by type)
- all other parameters remember their positional index (so that substitution becomes easier)
For now the comparison/equality is kept identical, so as to make easy CI comparisons.
Reviewed By: skcho
Differential Revision: D19232577
fbshipit-source-id: 0cd6a43db
Summary: Before going to a new lock representation that will allow, eg, substitutions with arguments for parameters on method calls, make the interface of the lock type abstract to ease the transition.
Reviewed By: mityal
Differential Revision: D19309359
fbshipit-source-id: 5277357ee
Summary:
Demonstrate that the per-file type environments don't prevent
the deadlock report here. The fear was that when the analyser
tries to locate the methods of the endpoint class, it might fail to
do so because the types might be stored in different type
environments (per file).
Reviewed By: mityal
Differential Revision: D19225908
fbshipit-source-id: 097e4aeea
Summary: This diff use actuall call path in the cost results instead of `class name + method name`.
Reviewed By: ngorogiannis
Differential Revision: D19194969
fbshipit-source-id: b72018586
Summary:
Model array length in Java as returning an unknown interval [0, +inf] for now.
Ideally, we can deal with the size in a more precise manner in the future like in InferBo.
Reviewed By: skcho
Differential Revision: D19312123
fbshipit-source-id: 8c51059a4
Summary:
This diff does a refactoring on the function that gets summary from DB,
`get_proc_summary_and_formals`.
* It separates the function into `get_summary` and `get_formals`, and
* renames `Checker.get_proc_summary` to `get_checks_summary`
Reviewed By: ngorogiannis
Differential Revision: D19300136
fbshipit-source-id: d28eaf16d
Summary:
This diff creates missing result directories in its running.
The problem was that `infer-out/captured` and its sub-directories were not ready at the step 3 below, which crashed with exceptions.
1. `infer capture -- [target build]`
2. `infer analyze --merge`
3. `infer analyze --merge --debug --reanalyze --procedures-filter '.*foo.*'`
Reviewed By: ngorogiannis
Differential Revision: D19274672
fbshipit-source-id: af84000d7
Summary: Pulse doesn't care about exceptions yet. With Exceptional CFG, java analysis takes a lot of time due to having many disjuncts. Let's use Normal CFG for now.
Reviewed By: jvillard
Differential Revision: D19194479
fbshipit-source-id: f94bb6078
Summary:
Kill these tests as that mode is not supported anymore.
Note that :
- "buck_cross_module" was effectively already dead since it's not hooked up to `make test`
- "buck" is actually another copy of "genrule" so wasn't testing anything
Reviewed By: ngorogiannis
Differential Revision: D19176166
fbshipit-source-id: b5bb90448
Summary:
This changes how we select amongst our (currently) 4 Buck integrations
for Java and clang, as well as how the user's choice is reflected by the
Config module.
The old command line interface is still supported but is now deprecated.
The changes in how to select each integration are:
- clang via "flavors", activated with `--flavors`, now with `--buck-clang`
- clang via "compilation DB", activated with `--buck-compilation-database`, unchanged
- Java via "genrule", activated with `--genrule-master-mode`, now with `--buck-java`
- Java "without genrules", used to be activated by *not specifying any other Buck mode*, unchanged
Instead of various `Config` flags corresponding to the previous CLI that
are allowed in any combination of `flavors`,
`buck_compilation_database`, `genrule_master_mode`, `Config` now exposes
a single `buck_mode` datatype. This allows, eg, `flavors` to override
`buck_compilation_database` if needed. It will also make it easier to
get rid of the old "Java without genrules" integration in a later diff
(see inline comments).
Reviewed By: ngorogiannis
Differential Revision: D19175686
fbshipit-source-id: 29b3831be
Summary:
We cannot necessarily know if the previous capture phase was java or
clang, hence to be on the safe side we should always merge the global
tenvs when merging Buck targets.
Reviewed By: ngorogiannis
Differential Revision: D19175685
fbshipit-source-id: 8e7492e14
Summary:
This generates a lot of code (the datatype is not trivial) and
transitively requires other datatypes to have compare functions, just so
we can then ask whether the mode is "Analyze".
Reviewed By: ngorogiannis
Differential Revision: D19164589
fbshipit-source-id: be6a12b41
Summary:
Infer would crash when started in a context where it already had
children it didn't know about.
Reviewed By: martintrojer
Differential Revision: D19177589
fbshipit-source-id: 0c8831597
Summary:
In order to improve the impurity analysis, this diff adds models for
- `hasNext()` and - `Object.equals()` modeled as returning a non-deterministic value (havoc_id)
- `next()` modeled as `StdVector.get` with a fresh index
- `iterator` modeled as just returning the underlying list
Reviewed By: jvillard
Differential Revision: D19177392
fbshipit-source-id: 0babb037a
Summary:
This diff updates the relation between iterator (offset) and integer value not only at
assignments (`x += 1`), but also at function calls (`foo()`) that increase integer values by one in
their side effects.
Reviewed By: ezgicicek
Differential Revision: D19163214
fbshipit-source-id: 47e52f939
Summary: This diff extends the domain to express the relation between iterator's offset and integer value.
Reviewed By: ezgicicek
Differential Revision: D19143670
fbshipit-source-id: 6223bc934
Summary:
Old versions of sawja/javalib got the line numbers slightly wrong. The workaround was to do a regexp search in the source file for the right line.
My understanding is that this is no longer necessary. This diff removes it.
Reviewed By: jvillard
Differential Revision: D19033415
fbshipit-source-id: 2da19d66d
Summary:
From a set of classes [classes], JClasspath.load_program builds a
program. This program contains (implicitely) the set of active classes
and we should not keep using the set [classes] and the generated
program as the same time, because they may not be synched
anymore. (In particular, in a forthcoming diff load_program may add
new classes during program construction)
This patch forces this discipline. It adds a [in_classes]
query for programs and makes sure we use it everywhere we should.
Reviewed By: ngorogiannis
Differential Revision: D18833335
fbshipit-source-id: a522f320c
Summary:
This is an optimization. We ask the user to tell us which states are nondeterministic, and we
generate code that handle nondeterminism only for those states. It is common for only one state per
TOPL property to be nondeterministic. This speeds up the biabduction-analysis of the monitor by a
factor of ~10. But, using the monitor is only a little faster.
Facebook
Reviewed By: jvillard
Differential Revision: D19160286
fbshipit-source-id: 4dd39769a
Summary:
The re-execution phase uses only the preconditions found by the footprint phase. Thus, Infer should
not spend time optimizing POSTconditions. These are used only to find custom errors.
Reviewed By: jvillard
Differential Revision: D19035495
fbshipit-source-id: d52b82733
Summary:
Move most of IR/Sil.ml into a new file biabduction/Predicates.ml to
reflect the fact that they are only useful for the biabduction analysis.
Unfortunately this is a huge change.
I tried to keep the change to a minimum, it's mostly about doing
s/Sil/Predicates/ in lots of places but sometimes I used the trick of
specifying parameters or return value types to avoid specifying the
module altogether. This isn't done consistently because there were just
too many places to change for poor me.
Reviewed By: ngorogiannis
Differential Revision: D19158530
fbshipit-source-id: d6dbcfe72
Summary:
hmmhmmhmm
Also `Sil.hpred` is going to move out of IR/ in a few diffs, into
biabduction/ where it belongs.
Reviewed By: ngorogiannis
Differential Revision: D19158535
fbshipit-source-id: e2a889ee2
Summary:
Part of making Sil.ml about SIL only.
In order to not introduce a dependency istd/Pp -> base/Config, the
utilities in Pp don't know when to introduce "diff" colours. Fix it by
wrapping them in Sil using the Config option. (we may want to just kill
that option at some point).
Similarly, move stuff from Io_infer to Pp.
Reviewed By: ngorogiannis
Differential Revision: D19158534
fbshipit-source-id: 8110cb7f9
Summary:
In the previous code, it removed non-build-called method calls. For example, it was like
```
{non-build-called: {prop1, prop3}}
{build-called: {}}
b.build();
{non-build-called: {}}
{build-called: {prop1, prop3}}
```
However, this behavior introduced a false positive when there is multiple builders that point to the
same abstract object and `build` is called one by one.
This diff changes the semantics to keep the method calls of non-build-called at `build` calls.
Reviewed By: ezgicicek
Differential Revision: D19144525
fbshipit-source-id: e2ace127f
Summary:
At some point, code reformatting moved the comment
in a place where it didn't make sense.
Reviewed By: ngorogiannis
Differential Revision: D19035489
fbshipit-source-id: 146ad8a15
Summary:
This applies some simplifications that were previously
done after footprint (and therefore lost), and some
simplifications that require looking at both pre and
post.
Reviewed By: ngorogiannis
Differential Revision: D19035494
fbshipit-source-id: bad79534a
Summary:
This havocs event data, so that biabduction doesn't try to
track what was the last event processed by the monitor
(which is redundant as long as the state of the monitor
is tracked).
Reviewed By: ngorogiannis
Differential Revision: D19035491
fbshipit-source-id: a1c75daae
Summary:
Don't instrument SIL when we can determine statically that
biabduction symexec would be a no-op.
Reviewed By: ngorogiannis
Differential Revision: D19116849
fbshipit-source-id: 4d25462a3
Summary: It is confusing to report missing props at the the beginning of the method (especially when there are many components created or when the method has many lines). Let's report them at create methods to better contextualize. Also, make the missing prop bold.
Reviewed By: skcho
Differential Revision: D19141135
fbshipit-source-id: a23d2e7c9
Summary:
It used to recompute the number of arguments during
instrumentation, which is unnecessary.
Reviewed By: ngorogiannis
Differential Revision: D19035492
fbshipit-source-id: 0f58c8ae7
Summary:
In addition to
state1 -> state2: pattern
one can now also write
state1 -> state2: pattern if condition
where "condition" is some conjunction of comparisons (==,<,>) that
involve variables bound by "pattern", registers of the automaton, and
constants.
Reviewed By: ngorogiannis
Differential Revision: D19035496
fbshipit-source-id: 6f6e6a9be
Summary:
The one with Object as the second param is in `com.facebook.common.internal`.
The one with String as the second param is in `com.facebook.common.preconditions`.
(Don't ask :) )
Reviewed By: artempyanykh
Differential Revision: D19087334
fbshipit-source-id: ba02c9101
Summary:
According to Java semantics, they are always non-null.
Internally they are represented as static fields, so they have
DeclaredNonnull nullability, which means NullsafeStrict mode would
refuse to use them without strictification.
Lets teach nullsafe that these guys are non-nullables.
See also FN in test case.
Reviewed By: ngorogiannis
Differential Revision: D19024547
fbshipit-source-id: 8c120fa50
Summary:
Inferbo does not use the external relational domains, apron and elina. At some point, the parts of
inferbo using them were broken and they do not seem to be fixed easily in the near future. Let's
remove them and keep the code base cleaner.
Reviewed By: jvillard
Differential Revision: D19022905
fbshipit-source-id: e0eafe79f
Summary:
We do not have the create method in the trace which makes it difficult to understand
- inter-procedural issues where create and prop setting are in different methods
- there are multiple create-build chains in a method
Let's add the create to the beginning of the trace. Moreover, let's simplify the prop printing to make traces easier to understand.
Reviewed By: ngorogiannis
Differential Revision: D19020213
fbshipit-source-id: 7f8a5d4ec
Summary: The new domain is much better than the old one. Let's kill the old one (along with old litho tests) and simplify things.
Reviewed By: skcho
Differential Revision: D18959627
fbshipit-source-id: df77ae20e
Summary:
- Remove `to_flat_string` as there is `get_field_name` that unambiguously does the same thing.
- Make `pp` print only the field in all languages.
- Fix `to_full_string` so that it has unified behaviour across java/clang and so that it doesn't print `class Foo.x`, but rather `Foo.x`.
Reviewed By: ezgicicek
Differential Revision: D18963033
fbshipit-source-id: e2c803c7d
Summary:
Remove Clang and Java submodules of Typ.Fieldname. They are unnecessary and they reflect a fake dichotomy: there is only one fieldname type. To distinguish between fields of Java classes and other C constructs, there is a helper function provided, but the idea is simple: obtain the class type the field belongs to, and check if it's a Java class.
This diff still preserves behaviour, but removes as many functions as possible from the interface, to leave a small surface.
Reviewed By: mityal
Differential Revision: D18962423
fbshipit-source-id: ffe6933ee
Summary: Unify treatment of Java and Clang fieldnames. Now a field is a struct with a class type-name and a string-field name. This diff is still behaviour preserving.
Reviewed By: jvillard
Differential Revision: D18953549
fbshipit-source-id: 8cae0d104
Summary: This function allows any string, and in particular empty class names. As a first step eliminate it in favour of a function that forces the caller to specify distinct class and field names. It turns out that the frontend already has them, so it saves effort along the way.
Reviewed By: jvillard
Differential Revision: D18953136
fbshipit-source-id: ff3cdfda5
Summary:
In order to handle the example added:
changed domain of `MethodCalled`
from `CreatedLocation -> (IsBuildCalled X IsChecked X Set(MethodCall))`
to `(CreatedLocation X IsBuildCalled) -> (IsChecked X Set(MethodCall))`
This avoids joining of two method calls where one is build-called and the other is not, e.g.,
```
if(b) {
o.build();
} else {
// no build call
}
```
changed domain of `NewDomain`
from `Created X MethodCalled`
to `(Created X MethodCalled) X (Created X MethodCalled)`
One is for no returned memory and the other is returned memory. This keeps precision some join
points of branches, e.g.,
```
if(b) {
return;
} else {
// no return
}
```
Reviewed By: ezgicicek
Differential Revision: D18909768
fbshipit-source-id: c39d1a1ef
Summary:
A plus is a plus, no need to give up when +/- is about pointers. This
gets rid of some false positives involving pointer arithmetic.
However, the problem remains if we make things a bit more
inter-procedural. This is documented in an added test.
Reviewed By: ezgicicek
Differential Revision: D18932877
fbshipit-source-id: 4ad1cfe72
Summary: It is not used anywhere and there are no plans to revive it. Kill it!
Reviewed By: skcho
Differential Revision: D18934719
fbshipit-source-id: b9b069b96
Summary: Under the buck/java integration, the classpath is propagated to all infer command lines. Logging that leads to huge waste and full disks. Make the logging conditional to debug mode.
Reviewed By: skcho
Differential Revision: D18934088
fbshipit-source-id: 7e2f410f5
Summary:
The `Typ.FIeldname` module has many issues. Among those:
- It has 5 different string/printing functions and most of them do radically different things in Java and in Clang.
- There is no type safety: creating a Clang field and calling a Java function on it will lead to a crash (`rindex_exn` etc, there are usually no dots in Clang fields).
- It uses a single string for Java fields, containing the package, the class and the field, e.g., `java.lang.Object.field`. This is wasteful, because
- there is no sharing of strings for packages/classes, and,
- string operations need to be performed every time we need the field or the class or the package alone.
This diff preserves the behaviour of the module's interface, so the API problems remain.
However, by using a saner representation for Java fields we can get small performance and large memory gains (the type environment in Java is much smaller, about 30-40%).
In addition, many functions on clang fields would previously do string manipulations (look for `.` and split on it) before returning the final field unchanged -- now they use the type of the field for that.
Reviewed By: jvillard
Differential Revision: D18908864
fbshipit-source-id: a72d847cc
Summary:
That class does some complicated accounting of memory that depends on
whether the string is "small", "medium" or "large". In the latter case
it does its own ref-counting and copy-on-write to save memory, and that
trips up pulse. Pretending all strings are small avoids that issue.
Reviewed By: skcho
Differential Revision: D18909030
fbshipit-source-id: 1c14d909b
Summary:
Including the current call state is useful because the contradiction
sometimes refers to abstract values that have been materialised since
the last call state so we cannot make sense of them unless we print the
current call state.
Reviewed By: skcho
Differential Revision: D18908424
fbshipit-source-id: 297f397a6
Summary:
- Do most of the work of `solve_arithmetic_constraints` inside `subst_attribute` instead, since we need to re-use the latter function for post-conditions where the first function is not appropriate.
- When substituting arithmetic constraints, we refine arithmetic information (both concrete intervals and inferbo), which can lead to inconsistent states. Instead of recording the new arithmetic facts by returning a new current state, just act as a map on attributes. This is to enable doing the point above.
- All this lead to a somewhat messy refactoring...
- Rename `CannotApplyPre` to `Contradiction` since it's used for post-conditions as well now
Reviewed By: skcho
Differential Revision: D18889120
fbshipit-source-id: d81647143
Summary:
After passing a `PRUNE` instruction we can refine the current inferbo
intervals for the values involved.
Reviewed By: ezgicicek
Differential Revision: D18889103
fbshipit-source-id: b521046aa
Summary:
This exposes a more general interface to other modules, at the cost of
hiding the fact that it won't deal with all binary operations with equal
precision.
Reviewed By: ezgicicek
Differential Revision: D18908095
fbshipit-source-id: 0c0653bb6
Summary: Guava uses assertions to ensure a future can be gotten without blocking (this means that if the future is not done, the app will crash). This diff teaches the starvation analyser about a number of such assertions, by treating them as assumes (since we don't care about exceptions).
Reviewed By: jvillard
Differential Revision: D18893427
fbshipit-source-id: 4d26a202b
Summary: A future is guaranteed not to block if `isDone()` has returned true first. Add logic for supporting that by remembering the objects that we have called `isDone` on and by making `assume` do the right thing with that knowledge. All this is achieved with the attribute domain.
Reviewed By: ezgicicek
Differential Revision: D18833901
fbshipit-source-id: 7f4ea0cd1
Summary: The formals of callees will be used in the following diff.
Reviewed By: ezgicicek
Differential Revision: D18878044
fbshipit-source-id: 6c01af826
Summary:
When retrieving a value from a container, we previously had an arbitrary hack which would
- In java, give no ownership to the returned object (trying to be sound)
- In C++ give conditional ownership to the current method's first argument (trying to be complete, but doing it badly, as the first argument may not be the `this` object in a static method, or we might be accessing it through another parameter altogether).
Harmonise both by using the existing ownership of the container as ownership value for the returned object (leaning towards completeness).
Reviewed By: jvillard
Differential Revision: D18882800
fbshipit-source-id: f98f8d315
Summary:
Every time we add an arithmetic information, add the corresponding
inferbo one.
Reviewed By: skcho
Differential Revision: D18888863
fbshipit-source-id: ab4afd372
Summary:
Pointers are hard... The previous test had no chance of doing
initialisation of the pointer by reference and was in fact a false
negative (and still is, fix incoming). Renamed functions to stress the
false negative and added a test that is really (potentially) doing
pointer initialisation by reference.
Reviewed By: skcho
Differential Revision: D18888008
fbshipit-source-id: 1e72408c7
Summary:
This reverts commit 4fd6165d190bab32544f9f040b777565432c15b2.
We don't need to check for reporting each node anymore. It suffices to just check per function.
Reviewed By: skcho
Differential Revision: D18883833
fbshipit-source-id: 2591b3af3
Summary:
Making `MethodCalled` an inverted map from created location to method calls results in not being able to track a builder that is created in two different branches of a conditional with different types. Instead, we can make `MethodCalled` simply a map and also change `Created` to be a map from access paths to a set of created locations.
To deal with the case of setting a prop only in one branch, we need to ensure that whenever we call a create method, we add a binding to `MethodCalled` with an empty list of methods so that its intersection with a non-empty one is empty.
Reviewed By: skcho
Differential Revision: D18883097
fbshipit-source-id: b3464ca20
Summary: As long as the types match, it should be possible to call build on two components that are created at different locations.
Reviewed By: skcho
Differential Revision: D18881740
fbshipit-source-id: 356f9e168
Summary:
Finally use information from the inferbo intervals in pulse's domain to
make decisions about whether conditionals are feasible or not.
Reviewed By: skcho
Differential Revision: D18811193
fbshipit-source-id: d80a28657
Summary:
Refine the type of inferbo intervals attributes to "pure" (non-bottom)
ones. This is because were we to get a Bottom value from inferbo we
should stop the abstract execution instead of recording it in the state.
Reviewed By: ezgicicek
Differential Revision: D18811165
fbshipit-source-id: fff8664b7
Summary:
Similarly to binops, let inferbo evaluate unary operations and record
the results.
Reviewed By: ezgicicek
Differential Revision: D18811146
fbshipit-source-id: 8f9e16bbd
Summary: Add a FN that is detected by the old domain but not the new one
Reviewed By: ngorogiannis
Differential Revision: D18854389
fbshipit-source-id: 9bdc90a6b
Summary: The map from `CreatedLocation` to `MethodCalls` already takes care of the association from create methods to their set props. `MethodCall` comparison should be oblivious the the receiver, otherwise, we risk mistakenly considering two props set at different locations as different.
Reviewed By: skcho
Differential Revision: D18829388
fbshipit-source-id: b5a0d628d
Summary: This diff check and report on every nodes. Problem of the previous design is that it has to report alarms only with the abstract memory of the exit node. However, the new abstract value becomes imprecise at every join points on the path to the exit node, since it is using inverted map, i.e., under-approximation on collecting called methods. As a solution, this diff report on every nodes where `.build` is called with the abstract memory at that node.
Reviewed By: ezgicicek
Differential Revision: D18809449
fbshipit-source-id: 4fd6165d1
Summary: Current method call comparison is too strong. As exemplified with the new test, one can also set the required prop by calling a version which contains the suffixes. The domain should take care of such cases now.
Reviewed By: skcho
Differential Revision: D18808869
fbshipit-source-id: 9f7672e75
Summary:
Sometimes clang9 does not return a boxing method (a name of function to apply), e.g., [@("str")].
To solve the issue, this diff uses "unknownSelector:" instead of giving up the translation.
Reviewed By: dulmarod
Differential Revision: D18831844
fbshipit-source-id: b9324ba39
Summary: This enables us to quickly pick up the Component typ when checking which required props to check.
Reviewed By: skcho
Differential Revision: D18807925
fbshipit-source-id: 47e407394
Summary: This diff checks litho condition on the new abstract value. This is triggered with `--new-litho-domain`, but it is intra-procedural as of now.
Reviewed By: ezgicicek
Differential Revision: D18783203
fbshipit-source-id: 98570104e
Summary: This diff adds a map from an object to a set of methods that has been called.
Reviewed By: ezgicicek
Differential Revision: D18781461
fbshipit-source-id: 47c10adaa
Summary: This adds a map from access expressions to locations where specific object is created by `create` method call.
Reviewed By: ezgicicek
Differential Revision: D18779985
fbshipit-source-id: f327450cd
Summary: This diff stack is to revise overall domain and semantics of litho checker. Some of the following diffs will not have visible changes until we replace the current checker with the new one.
Reviewed By: ezgicicek
Differential Revision: D18779592
fbshipit-source-id: d210d9bd1
Summary:
This can happen for a number of reasons that are not errors (mostly the exit node being unreachable) so isn't actionable, and definitely not worth showing the user. It could be a debug message but I don't think that's even worth it. Other checkers don't warn in similar circumstances.
With OCaml 4.08 we started actually seeing these error messages (differences in flushing behaviour?) so their annoying nature was revealed.
Reviewed By: ngorogiannis
Differential Revision: D18808460
fbshipit-source-id: a47a1dcb4
Summary:
Also add logic for recognising excessive timeouts. Refactor the code
around timeouts a little.
Reviewed By: artempyanykh
Differential Revision: D18807836
fbshipit-source-id: df5a1b566
Summary:
`Object.wait()` must be called on a locked monitor and it releases the
lock immediately, as far as other threads are concerned
(it also magically re-takes the lock when the monitor is `notified`).
Starvation can only occur if the UI thread is waiting
a lock that is distinct to that being waited on.
The check present was over-approximate in that it was checking that there exists a lock held by the UI thread and the thread issuing the `wait`, but did not make sure that lock was *not* the one waited on.
Amusingly, the e2e test was correct, but the reporting code wasn't.
Reviewed By: dulmarod
Differential Revision: D18782919
fbshipit-source-id: b3b98239e
Summary: The clang plugin exports C++ mangled names in hashed form for perf reasons, so we need to hash the incoming mangled names in the profiler samples, so that we can compare them.
Reviewed By: skcho
Differential Revision: D18761842
fbshipit-source-id: 3072b5e33
Summary: Similar to constructor established attributes, we do the same here for static initializers. That is, attributes of static properties are injected into the initial state of every method.
Reviewed By: ezgicicek
Differential Revision: D18763192
fbshipit-source-id: 3879a27c5
Summary:
For now lets support the simplest form: "//"-style comments.
Having comments is useful:
1. It serves as documentation for API.
2. It serves as justification of why such and such method or param is
nullable or not (so the future readers can understand the reasoning of
the person who added the signature).
Reviewed By: artempyanykh
Differential Revision: D18762289
fbshipit-source-id: 90c515ea8
Summary: Raises an error when weakSelf is used multiple times in a block. The issue is that there could be unexpected behaviour. Even if `weakSelf` is not nil in the first use, it could be nil in the following uses since the object that `weakSelf` points to could be freed anytime.
Reviewed By: skcho
Differential Revision: D18765493
fbshipit-source-id: 37fc652e3
Summary:
This diff enables parsing and auto-formatting documentation
comments (aka docstrings).
I have looked at this entire diff and manually made some changes to
improve the formatting. In some cases it looked like it would take too
much time, or benefit from someone more familiar with the code doing
it, and I instead disabled auto-formatting docstrings in those files.
Also, there are some source files where the docstrings are invalid,
and some where the structure detected by the parser appears not to
match what was intended. Auto-formatting has been disabled for these
files.
Reviewed By: ezgicicek
Differential Revision: D18755888
fbshipit-source-id: 68d72465d
Summary:
RacerD is angelic in the sense that when a method has no summary, no accesses are added to the symbolic state when we call that method. However, when the method returns an object we then proceed to access, this leads to non-angelic behaviour: if the object is assumed to be un-owned, then the accesses may lead to a race.
This manifests itself on Litho components, which are generated code without sources and thus RacerD has no CFG to analyse, and therefore produces no summary. The `Builder` patterns used in these classes are ubiquitous, and full of spurious races due to the fact that the returned objects, even though freshly allocated, are un-owned as far as RacerD knows.
Here, instead of going full-angelic and assuming that every method without a summary returns an owned object (which is a bit extreme), we try to model the `Builder` pattern wrt ownership. That is, static `create` methods returning `Builder` types are assumed to return full ownership; and, non-static methods of a `Builder` class which return the same type as their receiver are assumed to return conditional ownership.
Reviewed By: ezgicicek
Differential Revision: D18748423
fbshipit-source-id: bd53d4b67
Summary: This diff extends the bound domain to express multiplication of bounds in some simple cases.
Reviewed By: ezgicicek
Differential Revision: D18745246
fbshipit-source-id: 4f2dcb42c
Summary:
One standard way to schedule work is by starting a thread. We treat this by
- Treating invocations of `start` on a receiver with the `Runnable _` attribute as scheduling that runnable for parallel execution in the background (as opposed to on the UI thread).
- If `start` is used on an object of a subclass of `Thread` everything already works thanks to the `get_exp_attributes` function which will implicitly ascribe to an expression the attribute `Runnable _` if the expression points to an object with a known `run` method. This will even take care of some degree of dynamic dispatch, yay!
- If `start` is used on a `Thread` object which has been created with a constructor call provided with a `Runnable` argument, we have to appropriately model that constructor call, which is what is done in `do_call`.
Reviewed By: jvillard
Differential Revision: D18726676
fbshipit-source-id: 0bd83c28e
Summary:
A current blind spot is when object construction stores specific executors / runnables to object fields, which are then never mutated and accessed from normal methods. IOW the attributes established in the constructor are necessary to report properly inside a normal method (assuming these attributes are not invalidated by method code).
To achieve this, first we retain a subset of the final state attributes in the summary (only those that affect instance variables, in constructor methods). Then, when we analyse a non-constructor method:
- we analyse all constructors
- remove all attributes from the attribute map whose key is not an expression of the form `this.x. ...`
- re-localise all remaining keys so that they appear as rooted in the `this` local variable of the current procedure
- join (intersect) all such attribute maps
- use the result in place of initial state as far as the attribute map is concerned for the analysis of the current procedure, which can now start.
This means we can catch idioms that use side-effectful initialisation for configuring certain object fields like executors or runnables.
Reviewed By: jvillard
Differential Revision: D18707890
fbshipit-source-id: 42ac6108f
Summary: Another way to schedule work in android is by posting it to a `Handler`. A handler can be constructed out of the main looper, which forces it to schedule work on the UI thread. To model all this, we add syntactic models for getting the main looper and for creating handlers, and dataflow attributes for tracking that an expression is a looper/the main looper, or a handler constructed out of a looper.
Reviewed By: skcho
Differential Revision: D18706768
fbshipit-source-id: 7c46e6913
Summary:
We already have a number of `[pkg].Preconditions.checkNotNull`
modelled, but the one from `androidx` is missing yet widely used.
Reviewed By: mityal
Differential Revision: D18748550
fbshipit-source-id: 83d3317ae
Summary:
The introduction of inferbo intervals as pulse attributes creates the
first relational attributes. To make sense of inferbo intervals
appearing in summaries when in a caller context, we need to substitute
the abstract values they contain in the callee with the abstract values
they correspond to in the caller.
This has a significant consequence: we have to delay the check that
arithmetic constraints in the callee are satisfiable at the call-site
until *after* we have discovered all the relationships between callee
values and caller values from the heap. To solve this, we now run an
arithmetic constraints check *after* having materialised all the
addresses.
We also need to translate the abstract values in the attributes in the
post before recording them in the caller, for the same reasons.
Quite some code in this diff is concerned with substituting pulse values
inside inferbo intervals. There is a complication there too: even after
having discovered relationships between caller and callee abstract
values induced by the heap shapes, there could be abstract values in the
callee's attributes that we haven't seen yet. We need to make up new
values for these in the caller, so this substitution has to return a
potentially extended substitution.
Reviewed By: skcho
Differential Revision: D18745695
fbshipit-source-id: 077ae7670
Summary:
New syntax f1 AND-WITH-WITNESSES f2 : predicate_on_both_witnesses()
This is needed for a linter to check that a macro is present, see the test.
Reviewed By: skcho
Differential Revision: D18735988
fbshipit-source-id: a3be75c5e
Summary:
This gets rid of false positives when something invalid (eg null) is
passed by reference to an initialisation function. Havoc'ing what the
contents of the pointer to results in being optimistic about said
contents in the future.
Also surprisingly gets rid of some FNs (which means it can also
introduce FPs) in the `std::atomic` tests because a path condition
becomes feasible with havoc'ing.
There's a slight refinement possible where we don't havoc pointers to
const but that's more involved and left as future work.
Reviewed By: skcho
Differential Revision: D18726203
fbshipit-source-id: 264b5daeb
Summary:
It's a well-known fact that pulse should know too. To avoid splitting
the abstract state systematically, only act if we know the pointer is
exactly 0 to avoid reporting a nullptr dereference on `free(x)`.
Reviewed By: ezgicicek
Differential Revision: D18708575
fbshipit-source-id: 1cc3f6908
Summary:
Turns out code uses atomics in important places, modelling it removes
FPs.
The tests are copied from biabduction and adapted and extended a bit. I
didn't implement compare_exchange primitives for now (plus, giving them
a sequential semantics like in biabduction is probably a bit cheeky).
Reviewed By: skcho
Differential Revision: D18708576
fbshipit-source-id: a3581b8a4
Summary: This extends semantics of binary operator for BoItv. If there is no known interval value for a pulse value, it returns a symbolic value of the pulse value.
Reviewed By: jvillard
Differential Revision: D18726768
fbshipit-source-id: ed8ecf78b
Summary:
This diff adds inferbo's interval values to pulse's attributes. The added values will be used to
filter out infeasible passes in the following diffs.
Reviewed By: jvillard
Differential Revision: D18726667
fbshipit-source-id: c1125ac6e
Summary:
This will make our analysis more precise. E.g. in the future we can classify
"condition redundand" warnings by origin, and warn only for
InferredNonnull, or autogenerate fixes based on the origin.
Error messaging does not currently take into account origin for nonnull
types, but this can be changed in the future
Reviewed By: ngorogiannis
Differential Revision: D18685304
fbshipit-source-id: 6a1f263f5
Summary: The debugger in the middle of the evaluation makes working on that file difficult. Separating modules a bit, so that we can change the code easier. This is in preparation to trying to add aliases and witnesses to formulas in a next diff.
Reviewed By: jvillard
Differential Revision: D18708542
fbshipit-source-id: 523f30fc9
Summary: The tableaux evaluation was an experiment and it was turned off because of bad perf. Let's kill it to clear up the code.
Reviewed By: jvillard
Differential Revision: D18708388
fbshipit-source-id: 099f5a3d3
Summary:
This diff fixes the model of substring.
Problem: The cost model of the substring function was to return `size of string - start index` as a
cost. However, sometimes this was a negative number, because of state abstractions on paths, array
elements, call contexts, etc, which caused an exception inadvertently.
This diff changes the model to return just `size of string`, when it cannot say `size of string` is
bigger than `start index`.
Reviewed By: ezgicicek
Differential Revision: D18707954
fbshipit-source-id: 63f27e461
Summary: Rather than repeatedly matching actuals, let's use `ProcnameDispatcher.ModeledCall` to pick up the actual arguments with their corresponding values. This simplifies the models.
Reviewed By: jvillard
Differential Revision: D18685855
fbshipit-source-id: 7788bd8bb
Artem Pianykh
Nikos Gorogiannis
Ezgi Çiçek
Fernando Gasperi Jabalera
Mitya Lyubarskiy
Dulma Churchill
Jules Villard
Radu Grigore
Martin Trojer
Sungkeun Cho
Kfir Schindelhaim
David Pichardie
Artem Pyanykh
Josh Berdine