Summary:
An easy one. One subtlety: I needed to name the library "pulselib"
instead of "pulse" because dune got confused by the Pulse.ml module.
Reviewed By: skcho
Differential Revision: D21401815
fbshipit-source-id: 05e75b1fa
Summary:
Main change: needed to cut the dependency of inferbo on pulse, since
pulse will need to depend on inferbo. Achieved by changing the ad-hoc
"PulseValue" into a little less ad-hoc "ForeignVariable" variant.
Reviewed By: skcho
Differential Revision: D21401816
fbshipit-source-id: bb341b9ff
Summary:
Changing inferbo required changing all the analyses that depend on it
too. This introduces a new feature of the the new framework: the ability
for the checkers to read other analyses' payloads in a more functional
way.
Reviewed By: ezgicicek, skcho
Differential Revision: D21401819
fbshipit-source-id: f9b99e344
Summary:
An easy one. Will be needed eventually to make checkers/ its own dune
library.
Reviewed By: ngorogiannis
Differential Revision: D21401818
fbshipit-source-id: 64e8a4bf4
Summary:
`RegisterCheckers` is now doing a bunch of work to convert the new-style
checkers to the good old Callbacks datatypes. Extract the conversion
code into another module before more is added. A good opportunity to
document them.
Reviewed By: ezgicicek
Differential Revision: D21401817
fbshipit-source-id: 4cba3aa7b
Summary:
This module needs to be above all checkers since it knows about all the
checkers; put it at the same level of ondemand and callbacks.
Reviewed By: ezgicicek
Differential Revision: D21401821
fbshipit-source-id: f40dba6dd
Summary: Build tool wrappers sometimes have issues when their output streams are redirected to those of infer's while one of those streams is read and used in infer. This diff side-steps this problem by always redirecting the stream of interest to a file (which also helps in debugging), while logging the other stream through `Logging.progress`.
Reviewed By: jvillard
Differential Revision: D21404736
fbshipit-source-id: 04c92799c
Summary:
- move a few files from checkers/ so that nullsafe can depend on them
- nullsafe depends on a few files in biabduction/ via Errdesc (not the
biabduction analysis itself but some datatypes and functionality):
- when possible, I've moved the individual functions elsewhere, in absint/Decompile.ml
- nullsafe still depends on a function in Errdesc that unfortunately
depends on a bunch of biabduction datatypes like Prop(!) and some
other functionality that for now is embedded in biabduction
(substitution in SIL instructions).
Reviewed By: mityal
Differential Revision: D21351906
fbshipit-source-id: 757528120
Summary: So it can be used by dune libraries without depending on backend/.
Reviewed By: dulmarod
Differential Revision: D21351908
fbshipit-source-id: d288f9179
Summary:
Easy cleanup. The tenv is now part of the analysis_data that is in the
closure passed to the Dataflow framework.
Reviewed By: dulmarod
Differential Revision: D21351907
fbshipit-source-id: 592542c06
Summary:
This turned into a pretty big refactoring: the
`IntraproceduralAnalysis.t` needs to be passed around through quite a
few functions. These functions usually depended on
tenv/proc_desc/proc_name that are already in the `analysis_data` so
refactored that too (checking that these were indeed the same as in the
`analysis_data` record (using my own eyeballs). Interestingly there is
one place where we actually turn the analysis to other proc descs than
the original one in eradicate.ml so I've added a small comment there.
Reviewed By: mityal
Differential Revision: D21351909
fbshipit-source-id: 6e6330e5b
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: As per title. Also, hide most deduplication functionality inside a module.
Reviewed By: skcho
Differential Revision: D21382377
fbshipit-source-id: d979f5b54
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:
That function was testing if a proc is defined (ok) and if so if it also
had no summary. The second check is wrong because it could be that the
function hasn't been analysed yet. We should call "Ondemand" instead.
But, it seems like a weird check so I just deleted it and replaced is
with just the "is defined" check.
Renamed the "is_library" field in typeOrigin to "is_defined" to better
reflect the expectations. While I was at it, inlined record type
definitions in `TypeOrigin.t`. They were already inlined except for 2!
Reviewed By: dulmarod
Differential Revision: D21351453
fbshipit-source-id: 1acc7ff90
Summary:
This is to eventually remove eradicate's dependency on Ondemand and
other modules in backend/.
Reviewed By: mityal
Differential Revision: D21351456
fbshipit-source-id: 1c4723cbc
Summary: Improve determinism by sorting the order of capture databases before merging.
Reviewed By: jvillard
Differential Revision: D21378208
fbshipit-source-id: 9c82d9d56
Summary:
These exceptions were caught earlier before but D21257474 made absint
log an error every time before reraising them.
The exception type had to move to IR/ or absint/, so I moved
"SchedulerTypes" to "absint/TaskSchedulerTypes" and added the restart
scheduler's exception there. There is already a "Scheduler.ml" file in
absint/ so to address the ambiguity I added "Task" in front of that one.
Reviewed By: ngorogiannis
Differential Revision: D21348593
fbshipit-source-id: 58055c9b7
Summary: Factor out common behaviour and error handling in executing buck commands, while protecting from `SIGQUIT` which results in thread dumps appearing in standard output.
Reviewed By: jvillard
Differential Revision: D21331696
fbshipit-source-id: d3b6abe2d
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:
Kotlin has an experimental support for [JSR-305 custom nullability
qualifiers](https://github.com/Kotlin/KEEP/blob/master/proposals/jsr-305-custom-nullability-qualifiers.md).
Annotating Nullsafe in a special way makes kotlinc recognize it as
such custom nullability qualifier and therefore treat types coming
from Nullsafe Java classes **not** as platform types, but rather
proper nonnull/nullable, which affects:
1. Generated bytecode (more thorough null-checks).
2. Type inference in the IDE.
NOTE re: p.1: one might expect that with properly annotated Java code
Kotlin would avoid inserting runtime checks. This is not how
Kotlin-Java interop works - in reality Kotlin does even more runtime
checking for Java code annotated as Nonull, which IMO is a good
thing, since you can't trust Java anyway.
Reviewed By: mityal
Differential Revision: D21278440
fbshipit-source-id: d0598738a
Summary:
The idea was to keep track of why we know certain facts but actually
these traces are never read. Other arithmetic facts (BoItv and the path
condition) don't have histories so remove them from concrete intervals
too.
Reviewed By: dulmarod
Differential Revision: D21303353
fbshipit-source-id: eecf07b05
Summary:
It suppresses cost reports of access methods, anonymous class methods, and auto-generated methods.
For those methods, this diff blocks reporting both expensive
issue (`EXPENSIVE_COLD_START/_UI_THREAD`) and complexity increase issue (`COMPLEXITY_INCREASE`).
Reviewed By: jvillard
Differential Revision: D21303068
fbshipit-source-id: 1c9533956
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:
The test for the ant integration used to import all of biabduction tests
via a symlink. This is extremely annoying: whenever the biabduction
tests change, so do the ant tests.
Replace the ant tests with a simple single file project.
Reviewed By: ngorogiannis
Differential Revision: D21301450
fbshipit-source-id: 0d67d71d7
Summary:
Based on a shrewd observation by mityal, we can copy a little bit of
code from nullsafe and cut the dependency between biabduction and
nullsafe. The trick was to notice that biabduction doesn't use the full
power of the functions it was calling.
Reviewed By: mityal
Differential Revision: D21282656
fbshipit-source-id: 906847c26
Summary:
By far the most annoying thing to migrate. There will be a bunch of
these diffs.
Reviewed By: dulmarod
Differential Revision: D21261635
fbshipit-source-id: 0f290dd96
Summary:
This shows how the strategy for making each analysis its own library
looks like. Starting with biabduction since it's one of the worst ones.
A checker cannot depend on ProcData (in its current form) as it contains
a Summary.t. We don't want to change all the analyzers at once so let's
make up a new type. The new type also contains callbacks for Ondemand
since a checker that is its own dune library cannot call Ondemand
directly either (because Ondemand needs Summary.OnDisk).
Once all checkers are migrated we should be able to reclaim the
callbacks set up by callbacks.ml in exchange for these new callbacks,
therefore achieving a neutral callback karma.
Reviewed By: dulmarod, skcho
Differential Revision: D21261638
fbshipit-source-id: fa91ca50f
Summary:
Looks like this one was already causing circular dependency issues!
Saves threading the callback through *many* functions.
Reviewed By: ngorogiannis
Differential Revision: D21261636
fbshipit-source-id: 2b23aa07d
Summary:
- needed to make biabduction/ its own library as it shouldn't depend on
backend/Printer as a result
- it's a higher level of abstraction
Changed NodePrinter to not swallow biabduction timeouts, thereby
removing its footgunness.
Reviewed By: ngorogiannis
Differential Revision: D21261645
fbshipit-source-id: 592526d85
Summary:
absint/ is its own dune library. There was one last obstacle: we need
callbacks to `NodePrinter`. We'll add more to `AnalysisCallbacks` in future
diffs.
Reviewed By: ngorogiannis
Differential Revision: D21257476
fbshipit-source-id: 3a2ddef14
Summary:
`State` is used by the AI framework, which isn't supposed to know about
biabduction/. Split the biabduction-specific parts into
biabduction/State.ml and keep the rest in absint/AnalysisState.ml.
Reviewed By: ngorogiannis
Differential Revision: D21257470
fbshipit-source-id: e01d1fed3
Summary:
`ProcData.t` contains a `Summary.t`. Eventually we want to fix this too
so that checkers don't depend on backend/, i.e. on all the other
checkers via Summary.ml. But in order to migrate progressively we can
first migrate absint/ and one step on the way is for it to not know what
kind of analysis data it is passing around.
This extra flexibility only costs us passing an extra `Procdesc.t` in a
couple more functions so it's actually not a bad change in itself.
Reviewed By: ngorogiannis
Differential Revision: D21257466
fbshipit-source-id: a91f7b191
Summary:
This is needed to make absint/ its own dune library. Modules in absint/
cannot depend on modules in backend/. This is because backend/Summary.ml
depends on *all* the (inteprocedural) analyses since its stores elements
of their domains. But analyses are supposed to depend on absint/ to
use the AI framework and others. Thus absint/ cannot depend on backend/
otherwise it creates a dependency cycle.
Right now infer builds with this cycle because we consider all these
directories to be one library and there is no dependency cycle between
the individual modules, but making absint/ a library makes the situation
coarser.
One actual change in there: one function in PatternMatch was specific to
nullsafe and was moved there.
Reviewed By: ngorogiannis
Differential Revision: D21257467
fbshipit-source-id: 42af43315
Summary:
This is a step in disentangling the various analyses: that file used to
make every checker on biabduction because of a few of its functions that
use biabduction datatypes.
Split reporting.ml into:
- Reporting.ml: the functions all checkers need to report errors. This
is put in absint/ with the other files that are needed by all
checkers.
- SummaryReporting.ml: functions that need to depend on Summary.ml
(useful for later). This is put in backend/ where Summary.ml lives.
- BiabductionReporting.ml: for the biabduction analysis
The rest of the changes are renames to use the appropriate module
amongst the above.
Reviewed By: ngorogiannis
Differential Revision: D21257468
fbshipit-source-id: fa28cefbc
Summary:
This doesn't depend on the java frontend, as we can see from the fact
that it was symlinked from java/ into java_stubs/. So instead of having
these fake stubs (double negation!) put that file in IR/.
Reviewed By: ngorogiannis
Differential Revision: D21257469
fbshipit-source-id: 1c9e88bcc
Summary:
We re-raise all exceptions a few lines below already so this is not
needed. In fact it prevents us from writing the html cleanly before
hitting the exception, which was bad.
Reviewed By: ngorogiannis
Differential Revision: D21257474
fbshipit-source-id: 0b7e2b8d3
Summary:
This fixes a long-standing TODO. I re-ordered the lines by:
- first putting each entry on a single line (replacing "^J " -> " "
in emacs)
- then using emacs' M-x reverse-region
- then auto-formatting again
Reviewed By: skcho
Differential Revision: D21257475
fbshipit-source-id: 91b780a5d
Summary:
The are already ignored by git and can be useful to 1) debug when the
deadcode Makefile has a bug, and 2) help incremental analysis.
Reviewed By: ngorogiannis
Differential Revision: D21277538
fbshipit-source-id: dc6394ed7
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:
Good night, sweet prince. This was never used and hasn't seen progress
in a while.
Reviewed By: jberdine
Differential Revision: D21201932
fbshipit-source-id: e6f537b30
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:
As artempyanykh pointed out, exposing trust list might encourage clients to
start writing business logic manipulating with trust lists outside of
NullsafeMode module, which we don't like to happen.
Reviewed By: artempyanykh
Differential Revision: D21230973
fbshipit-source-id: 39bd0b0d8
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:
The order of model list is important to understand which model will be dispatched. Previously, the
models were shuffled with no pattern or rule. This diff sorts them and collects them as groups, so
making it easier to anticipate the dispatch.
Reviewed By: jvillard
Differential Revision: D21227541
fbshipit-source-id: 80be46d86
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:
1. Most of trust list operations are abstract anyway, we don't actually
rely on the fact that this is list
2. Inside NullsafeMode.ml, we effectively need set operations, which is both more
idiomatic to express and Ocaml and faster
3. This will simplify implementation of the next diff which introduces
mode intersect operation
Reviewed By: artempyanykh
Differential Revision: D21207207
fbshipit-source-id: 0c1fc4426
Summary: Iterator invalidation traces were based on vector rather than iterator itself.
Reviewed By: ezgicicek
Differential Revision: D21202047
fbshipit-source-id: 62ce8a488
Summary: The transition function was using a complicated-looking and possibly-inefficient pattern of options for everything, when simple pattern matching with guards is sufficient.
Reviewed By: skcho
Differential Revision: D21179606
fbshipit-source-id: a37f97594
Summary:
Lets move the logic dealing with non-java classes outside of this module
so we can modify it easier in the next diff.
Reviewed By: artempyanykh
Differential Revision: D21204822
fbshipit-source-id: 67b5937bc
Summary:
Because of this bug, we evaluated anonymous class constructors in
Default mode, even if the underlying class was Nullsafe
Reviewed By: artempyanykh
Differential Revision: D21202986
fbshipit-source-id: a31318901
Summary: Specialise the above option to `true` and remove resulting dead code.
Reviewed By: dulmarod
Differential Revision: D21177041
fbshipit-source-id: 4a1c65850
Summary: This option makes RacerD angelic wrt the ownership of returned objects from procedures without summary. This will now be made the default and the option deprecated up the diff stack.
Reviewed By: dulmarod
Differential Revision: D21174676
fbshipit-source-id: 9c48d3d7d
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
Summary: Models were partial and/or simply missing (`Map` writes!). Now the modelled containers use inheritance for conciseness (`List` reads are only those not caught by the `Collection` matcher, etc). Also, add URLs to documentation sources.
Reviewed By: ezgicicek
Differential Revision: D21132069
fbshipit-source-id: fefb360f0
Summary: `CFBridgingRelease` and `__bridge_transfer` which I'll model later, transfer the memory model from manual memory ref count to ARC (automatic ref count), so to avoid false positives this needs to be modelled. We can simply remove the Allocated attribute from the state, which means we won't try to track that memory anymore.
Reviewed By: skcho
Differential Revision: D21088218
fbshipit-source-id: 3520a0d59
Summary: This diff suppresses cost issues on lambda and auto-generated procedures, since they were too noisy.
Reviewed By: ezgicicek
Differential Revision: D21153619
fbshipit-source-id: 65ad6dcc3
Summary:
Replace horrible hack with ok hack.
The main difficulty in implementing the disjunctive domain is to avoid
the quadratic time complexity of executing the same disjuncts over and
over again when going around loops:
First time around a loop, assuming for example a single disjunct `d`:
```
[d]
loop body
[d1' \/ d2']
```
Second time around the same loop: the new pre will be the join of the
posts of predecessor nodes, so `old_pre \/ post(loop,old_pre)`, i.e.
`d \/ d1' \/ d2'`. Now we need to execute `loop body` again
*without running the symbolic execution of `d` again* (and the time after
that we'll want to not execute `d`, `d1'`, or `d2'`).
Horrible hack (before): Disjuncts have a boolean "visited" attached
that does its best to keep track of whether a given disjunct is old or
new. When executing a single *instruction* look at the flag and skip the
state if it's old. Of course we have no way to know for sure so it turns
out it was often wrongly re-executing old disjuncts. This was also
producing the wrong results over even simple loops: only the last
iteration would make it outside the loop for some reason. Overall, the
semantics were pretty untractable and shady at best.
New hack (this diff): only run instructions of a given *node* on
disjuncts that are not physically equal to the "pre" ones already in the
invariant map for the current node.
This gives the correct result over simple loops and a nice performance
improvement in general (probably the old heuristic was hitting the
quadratic bad case more often).
Reviewed By: skcho
Differential Revision: D21154063
fbshipit-source-id: 5ee38c68c
Summary:
This is a preparatory diff to make the actual change more readable. This
just moves the code around, trying to change it as little as possible.
Reviewed By: skcho
Differential Revision: D21154065
fbshipit-source-id: e086318c1
Summary:
This makes the API of [instrs] easier to work with at the price of some
duplication in the GADT.
This allows us to construct `[skip]` in `AbstractInterpreter` without
imposing a particular direction. This will make it the next diffs about
a disjunctive domain easier.
Reviewed By: skcho
Differential Revision: D21153694
fbshipit-source-id: f86c180fa
Summary:
We translated the expression `CXXStdInitializerListExpr` naively in D3058895 as a call to
a skip function, with the hope that it would be translated better in the future. However, the naive means that we lose access to the initialized list/array because we are simply skipping it. So, even if we want to model the initializer properly, we have to deal with the skip specially.
This diff tries to solve this problem by removing the skip call whenever
possible. Instead, we translate the underlying array/list as a Load, so
that when it is passed to the constructor, we can pick it up.
For the following initialization:
``` std::vector<int*> vec = {nullptr};
```
Before, we translated it as
```
*&0$?%__sil_tmpSIL_materialize_temp__n$7[0]:int* const =null
n$8=_fun___infer_skip_function(&0$?%__sil_tmpSIL_materialize_temp__n$7:int* const [1*8] const )
n$9=_fun_std::vector<int*,std::allocator<int*>>::vector(&vec:std::vector<int*,std::allocator<int*>>*,n$8:std::initializer_list<int*>)
```
However, this means, `n$8` would be result of something skipped which we can't reason about. Instead, we just pass the underlying initialized array now, so we get the following translation:
```
*&0$?%__sil_tmpSIL_materialize_temp__n$7[0]:int* const =null
n$8=*&0$?%__sil_tmpSIL_materialize_temp__n$7:int* const [1*8] const
n$9=_fun_std::vector<int*,std::allocator<int*>>::vector(&vec:std::vector<int*,std::allocator<int*>>*,n$8:std::initializer_list<int*>)
```
Reviewed By: jvillard
Differential Revision: D21155014
fbshipit-source-id: 75850b1e6
Summary:
It is true that `Info` issues are normally not intended for the end user
and in general should be hidden by default.
However, the current behavior - show them only if `--no-filtering` is
true - is super non-intuitive and complicates already complex reporting
logic.
Lets use the general "enable/disable" mechanism for controlling this.
Reviewed By: jvillard
Differential Revision: D21154140
fbshipit-source-id: 69e4c88e4
Summary:
Computing sledge's equality relation and normalising terms is costly. We
can avoid doing that most of the time by keeping the sledge path
condition lazily evaluated and only forcing it down to a value at two
critical points in the analysis:
1. Summary creation, to avoid storing unsatisfiable pre/posts that will have
to be needlessly executed by callers. This also saves us from having
to serialise the closures involved in the uncomputed form of lazy
values inside the pulse summaries.
2. Before reporting errors we check in the state is in fact satisfiable.
If not we just prune it away at that point.
This yields ~4x speedup on some targets.
Reviewed By: ezgicicek
Differential Revision: D21129759
fbshipit-source-id: a75fdd3bc
Summary:
This is mostly just a type change for now, more changes to come. This
doesn't make thing much faster yet because we force computations pretty
often to check for unsatisfiability (each function call and PRUNE node).
Next diff will build on that.
Reviewed By: skcho
Differential Revision: D21129758
fbshipit-source-id: 72200e2b1
Summary:
When encountering a constant, pulse creates an abstract value (a
variable) to represent it, and remembers that it's equal to it. The
problem is that pulse doesn't yet know how to deal with the fact that
some variables are going to be equal to each other.
This hacks around this issue in the case of constants, within the same
procedure, by remembering which constants have been assigned to which
place-holder variables, and serving those variables again when the same
constant is translated again.
Limitation: this doesn't work across procedure calls as the "constant
maps" are not saved in summaries.
Something to look out for: we don't want to make `if (p == NULL)` create
a path where `p` is invalid (we only make null invalid when we see an
assignment from 0, i.e. `p = NULL;`).
Reviewed By: ezgicicek
Differential Revision: D21089961
fbshipit-source-id: 5ebb85d0a
Summary:
1. Package will make the error too verbose.
2. We don't even need to say it is "class" because we say it in the error
description ("Class has 0 issues and can be marked Nullsafe").
Reviewed By: artempyanykh
Differential Revision: D21131998
fbshipit-source-id: 6ccca7615
Summary:
One source of false positives on container races is when the container member field is initialised to a concurrent version in a constructor, but the static type of the field doesn't reflect the thread safety of it.
This solution
- tracks flows from constructors of safe data structures to abstract addresses;
- initialises the initial attribute state when analysing a non-constructor method to that achieved by all constructors/class-initializers.
- checks for that attribute when recording container accesses.
Reviewed By: jvillard
Differential Revision: D21089428
fbshipit-source-id: 02a88f6e8
Summary:
As artempyanykh pointed out, `nullable` works much better for required fields
than `optional` in terms of x-plat.
Reviewed By: artempyanykh
Differential Revision: D21129614
fbshipit-source-id: b03c91b78
Summary: Modeling vector iterator with two internal fields: an internal array and an internal pointer. The internal array field points to the internal array field of a vector; the internal pointer field represents the current element of the array. For now `operator++` creates a fresh element inside the array.
Reviewed By: ezgicicek
Differential Revision: D21043304
fbshipit-source-id: db3be49ce
Summary:
The java source file parser should refuse to run on non
.java file. Also, as we expect some autogenerated source files to
break Java official syntax, we catch parsing error silently and
cancel location recording for them.
Reviewed By: jvillard
Differential Revision: D21089587
fbshipit-source-id: 35f1a1e28
Summary:
Now that only races rooted at formals or globals are reported, there is no point using the ownership domain to exclude accesses to locals, so remove the code that initialises the ownership of those.
Also, remove an accidentally quadratic use of `Map.bindings |> List.find` in `FormalMap` and simplify the analysis driver.
Reviewed By: skcho
Differential Revision: D21066855
fbshipit-source-id: 126080778
Summary:
Add a path condition to each symbolic state, represented in sledge's arithmetic domain. This gives a precise account of arithmetic constraints. In particular, it is relation and thus is more robust in the face of inter-procedural analysis.
This is gated behind a flag for now as there are performance issues with the new arithmetic.
Reviewed By: jberdine
Differential Revision: D20393947
fbshipit-source-id: b780de22a
Summary: Move state to summary conversion into the domain file, move a model matcher into the models file and simplify.
Reviewed By: skcho
Differential Revision: D21064351
fbshipit-source-id: bb5b07b6b
Summary:
There are two types of anonymous classes (not user defined classes):
- classic anonymous classes (defined as $<int> suffixes)
- lambda classes (corresponding to lambda expressions). Experimentally,
they all have form `$Lambda$_<int>_<int>`, but the code just uses
`$Lambda$` as a heuristic so it is potentially more robust.
# Problem this diff solves
When generate meta-issues for nullsafe, we are interested only in
user-defined classes, so we merge all nested anonymous stuff to
corresponding user-defined classes and hence aggregate the issues.
Without this diff, for each lambda in the code, we would report this as
a separate meta-issue, which would both screw up stats and be confusing
for the user (when we start reporting mode promo suggestions!).
Reviewed By: artempyanykh
Differential Revision: D21042928
fbshipit-source-id: a7be266af
Summary: In `PowLoc`, we focus on making every constructors of `PowLoc.t` return nomalized value. Thus, it is unnecessary to nomalize any `PowLoc.t` inputs.
Reviewed By: ezgicicek
Differential Revision: D21064893
fbshipit-source-id: d00a7f06b
Summary:
This diff revises how to handle the unknown location in inferbo in two ways:
* stop appending field to the `Unknown` location, e.g. `Unknown.x.a` is evaluated to `Unknown`
* redesign the abstract of multiple locations, like `Bottom` < `Unknown` < `Known` locations
I am doing them in one diff since applying only one of them showed bad results.
Background: `Unknown` was adopted for abstracting all unknown concrete locations, so we could avoid missing semantics of assignments to unknown locations. We tried to keep soundness. However, it brought some other problems related to precision and performance.
1. Sometimes especially when Inferbo failed to reason precise pointer values, `Unknown` may point to many other abstract locations.
2. At that time, value assignments to `*Unknown` makes the situation worse: many abstract locations are updated with imprecise values.
This problem harmed not only its precision, but also its performance since it introduced more location entries in the abstract memory.
Reviewed By: jvillard
Differential Revision: D21017789
fbshipit-source-id: 0bb6bd8b5
Summary: The flags `--biabduction-fallback-model-alloc-pattern` and `--biabduction-fallback-model-free-pattern` were unused because we removed the models from .inferconfig a while ago because of too many false positives. We are implementing a better memory leak check based on Pulse, and are adding the similar flags `--pulse-model-alloc-pattern` and `--pulse-model-free-pattern`.
Reviewed By: jvillard
Differential Revision: D21061511
fbshipit-source-id: 1b3476c22
Summary:
Instead of having to remember to update both the inferbo and the concrete
intervals domains of pulse, hide these details under a unified API. This
should help the transition to adding a third(!) numerical domain later
on (pudge!).
Reviewed By: ezgicicek
Differential Revision: D21022920
fbshipit-source-id: 783157464
Summary:
Now that the shape of the record type of AbductiveDomain.t is known, we
don't need this getter anymore. Keep `get_pre` and `get_post` as they
perform useful casting to `BaseDomain.t`.
Reviewed By: ezgicicek
Differential Revision: D21022924
fbshipit-source-id: 340f4edf8
Summary:
The "interface" modules define short forms for the internals of pulse
and also serve as a guide of which modules you are supposed to use at
which "level" in the pulse domains (base domain vs abductive domain vs
higher-level PulseOperations.ml). Make sure they are used.
Reviewed By: skcho
Differential Revision: D21022927
fbshipit-source-id: f890df245
Summary:
PulseAbductiveDomain.ml can be split into two distinct parts:
1. The definition of the "abductive domain" itself. This remains in that
file.
2. How to apply a given pre/post pair to the current state (during a
function call). This is about the same size as 1. in terms of lines
of code(!) and is now in PulseInterproc.ml.
Reviewed By: ezgicicek
Differential Revision: D21022921
fbshipit-source-id: 431fe061e
Summary:
I'm moving this code in the next diff and need this refactor. It should
be the same as before.
Reviewed By: ezgicicek
Differential Revision: D21022926
fbshipit-source-id: ebe644ef9
Summary:
See the code comment re: why don't we also recommend "strict" at this
stage. We can always change it later when we think users are happy with
strict.
Reviewed By: artempyanykh
Differential Revision: D21039553
fbshipit-source-id: 758ccf32c
Summary:
Having copypaste is painful to support. Lets make .mli the source of
truth.
Improved docs a bit, while I was here.
Reviewed By: artempyanykh
Differential Revision: D20948916
fbshipit-source-id: 1668dbc9c
Summary:
This diff is a step forward to the state when the list of type violations is
independent of the mode (and we use mode solely to decide re: whether to
report or not).
This fixes a case when we incorrectly defined possible promo mode (see
the test payload)
Reviewed By: artempyanykh
Differential Revision: D20948897
fbshipit-source-id: 616b96f96
Summary:
See the comments in the code why it makes logical sense.
This diff is a step forward the state when list of type violations is
independent of the mode (and we use mode solely to decide re: whether to
report or not).
This fixes majority of cases in ModePromotions.java
Reviewed By: artempyanykh
Differential Revision: D20948656
fbshipit-source-id: 82c0d530b
Summary:
Currently we exlude only if the method is based on deprecated config
packages.
Lets use the proper method, which covers both cases (config +
user-defined third party repo).
Reviewed By: artempyanykh
Differential Revision: D20946506
fbshipit-source-id: c3332667f
Summary:
Previously, we learned to detect if Default mode class can be made
Nullsafe(LOCAL).
Lets generalize it and calculate the precise mode.
NOTE 1: We don't distinct shades of "Trust some". We also don't
recommend trust some and recommend "Trust all" instead.
NOTE 2: As you can see from the test payload (see ModePromotions.java),
the precise calculation is not working as expected. This is due to a bug
in nullsafe implementation/design. See follow up diffs that will fix
this test.
Reviewed By: artempyanykh
Differential Revision: D20941345
fbshipit-source-id: 2255359ba
Jules Villard
Nikos Gorogiannis
Sungkeun Cho
Mitya Lyubarskiy
Ezgi Çiçek
Artem Pianykh
Dulma Churchill
Daiva Naudziuniene
David Pichardie