Summary: Holding a master lock and then acquiring two other locks inside can generate a false positive as shown.
Reviewed By: mityal
Differential Revision: D17710076
fbshipit-source-id: 5bc910ba2
Summary:
Previously deduplication was always on which is not great for testing.
Also split tests so that we can still test deduplication separately.
Reviewed By: mityal
Differential Revision: D17686877
fbshipit-source-id: 280d91473
Summary:
Ideally the analyser should equate locks `this.x.f` and `a.x.f` in different methods if they can alias.
The heuristic removed here was rarely used and is in the way of a re-write of the analysis.
It was also badly implemented, as this should ideally be the comparison relation of `Lock`.
Reviewed By: mityal
Differential Revision: D17602827
fbshipit-source-id: 4f4576c1a
Summary:
This diff generates a symbolic value when a function returns only
exceptions. Previously, the exception expression is evaluated to top,
thus it was propagated to other functions, which made those costs as
top. For preventing that situation, this diff changed:
* exception expressions are evaluated to bottom, and
* if callee's return value is bottom, it generates a symbolic value
for it.
Reviewed By: ezgicicek
Differential Revision: D17500386
fbshipit-source-id: 0fdcc710d
Summary: This diff introduces an inequality for the size alias targets, in order to get preciser array lengths after loops. The alias domain in inferbo was able to express strict equality between alias source and its targets, e.g. x=size(array). Now, for the size alias target, it can express less than or equal relations, e.g. x>=size(array).
Reviewed By: ezgicicek
Differential Revision: D17606222
fbshipit-source-id: 2557d3bd0
Summary: Component.Builder has its own non-required props that are inherited by the MyComponent.Builder. Add tests where these common props are set in the chain of calls.
Reviewed By: Katalune
Differential Revision: D17710294
fbshipit-source-id: f3c5ef28c
Summary: `Prop(varArg = myProp) List <?> myPropList` can also be set via `myPropList()` or `myProp()`. Add support for picking up the `varArg` and checking this form of required props.
Reviewed By: ngorogiannis
Differential Revision: D17571997
fbshipit-source-id: 7956cb972
Summary:
Turns out, we did not have such a test in place.
Known issue: we report over-annotated warnings for each fields N times,
one per constructor, which is wrong.
Reviewed By: artempyanykh
Differential Revision: D17574791
fbshipit-source-id: def992691
Summary:
This diff avoids giving the top value to unknown globals in Java,
because they harm precision of the cost checker. Instead, it doesn't
subst the global symbols at function calls.
Reviewed By: ezgicicek
Differential Revision: D17498714
fbshipit-source-id: d1215b3aa
Summary:
This diff adds an eval mode for the substitutions of the cost results, in order to avoid precision
loss by joining two symbols.
The usual join of two different symbolic values, `s1` and `s2`, becomes top due to the limitation of
our domain. On the other hand, in the new eval mode, it returns an upperbound `s1+s2`, because the
cost values only care about the upperbounds.
Reviewed By: ezgicicek
Differential Revision: D17573400
fbshipit-source-id: 2c84743d5
Summary:
This continues work for eliminating Annot.Item.t from Nullsafe low-level
code.
The introduced function `from_nullsafe_type` is called when we infer
initial type of the equation based on the function or field formal signature.
Before that, we did it via reading the annotation directly, which
complicates the logic and making introducing Unknown nullability tricky.
## Clarifying the semantics of PropagatesNullable
This diff also clarifies (and changes) the behavior of PropagatesNullable params.
Previously, if the return value of a function that has PropagatesNullable params was
annotated as Nullable, nullsafe was effectively ignoring PropagatesNullable effect.
This is especially bad because one can add Nullable annotation based on the logic "if the function can return `null`, it should be annotated with Nullable`.
In the new design, there is no possibility for such a misuse: the code that
applies the rule "any param is PropagatesNullable hence the return
value is nullable even if not explicitly annotated" lives in NullsafeType.ml, so
this will be automatically taken into account.
Meaning that now we implicitly deduce Nullable annotation for the return value, and providing it explicitly as an alternative that does not change the effect.
In the future, we might consider annotating the return value with `Nullable` explicit.
Reviewed By: jvillard
Differential Revision: D17479157
fbshipit-source-id: 66c2c8777
Summary:
In the cost checker, the range of selected control variables are used to estimate the number of loop iteration. However, sometimes the ranges of control variables are not related to how many times the loop iteration. This diff strengthens the condition for them as:
1. integers from `size` models
2. integers constructed from `+` or `-`
3. integers constructed from `*`
For the last one, the loop iteration is likely to be log scale of the range of the control variable:
```
while (i < c) {
i *= 2;
}
```
We will address this in the future.
Reviewed By: ezgicicek
Differential Revision: D17365796
fbshipit-source-id: c1e709ae8
Summary: Our annotation parameter parsing is too primitive to identify `resType` and before we only assumed that all Prop's can be set by any of the two suffixes: `Attr` and `Res`. After talking to Litho team, there is 3 more additions to these suffixes: `Dip`, `Sip`, and `Px`.
Reviewed By: ngorogiannis
Differential Revision: D17528482
fbshipit-source-id: 8d7f49130
Summary: Before, we were mistakenly checking any annotation that ends with Prop such as TreeProp. This was wrong. Instead, we should only check Prop as adviced by the Litho team.
Reviewed By: ngorogiannis
Differential Revision: D17527769
fbshipit-source-id: b753dd87a
Summary:
`ModeledRange` represents how many times the interval value can be updated by modeled functions. This
domain is to support the case where there are mismatches between value of a control variable and
actual number of loop iterations. For example,
```
while((c = file_channel.read(buf)) != -1) { ... }
```
the loop will iterates as the file size, but the control variable `c` does not have that value. In
these cases, it assigns a symbolic value of the file size to the modeled range of `c`, then which
is used when calculating the overall cost.
Reviewed By: jvillard
Differential Revision: D17476621
fbshipit-source-id: 9a81376e8
Summary:
This diff extends the `Simple` alias domain to address Java's
temporary variables better. It now has an additional field to denote
an alias temporary variable.
Reviewed By: jvillard
Differential Revision: D17421907
fbshipit-source-id: 8b8b47461
Summary:
D17397144 adds dedicated tests for condition redundant.
We also have tests for overannotated methods.
This makes these test cases redundant. Let's not pollute the results.
Reviewed By: jberdine
Differential Revision: D17398757
fbshipit-source-id: 10f6beeca
Summary:
This will simplify modifying functionality around this type of error.
Also rename the file for clarity.
Reviewed By: jvillard
Differential Revision: D17397144
fbshipit-source-id: 552215243
Summary:
This diff revises widening functions of bounds that have a linear form and a min/max form.
For example, for lower bounds,
* 3 ▽ (1+min(2, x)) = (1+min(2, x))
* 3+x ▽ (3+min(2, x)) = (3+min(2, x))
Reviewed By: jvillard
Differential Revision: D17420786
fbshipit-source-id: ff9eebed3
Summary:
This diff addresses collection adds in loop. For example,
```
ArrayList<...> a = new ArrayList<>();
for (int i = 0; i < size; i++) {
a.add(...);
}
// we want to know the size of `a` here!
```
This is a common pattern on initializing a collection in Java.
How we did: Instead of adopting general (but complicated) solutions such as relational domain, we
extended the current alias domain of inferbo, to be able to handle this specific case:
* An array `a` should have size 0, at the entry of the loop.
* The iterating variable `i` should start with 0.
* `add` should be called once inside the loop.
Reviewed By: jvillard
Differential Revision: D17319350
fbshipit-source-id: 99b6acae1
Summary:
In D17156724, we forked nullsafe tests, which was a strategy to
introduce nullsafe-gradual mode back then.
The reason was "gradual" mode is a pretty big change in a way Infer
handles annotations, so we wanted to tests both scenarios: gradual and
non-gradual mode.
The plan was to deprecate "non-gradual" tests at some point, hence we
decided to go with duplication.
Now we have a better approach to ensure "gradual" features are well
covered. The approach is the following.
1. [Mostly finished] Improve existings tests so that they cover negative and positive
cases. With this, we can safely add something like
--non-annotated-default UNKNOWN_NULLABILITY to the test config and be sure tests still make
sense (i.e. don't pass simply because annotations don't make sense
anymore)
2. [In progress]. Refactor nullsafe code so that instead of using of Annot.ml everywhere we use a special abstraction telling if the class is annotated with Nullable, Nonnull, or not annotated. With this change, we essenstially have a single place we need to test, which removes the need to have 2 pair of tests for each feature.
3. [To be done]. Introduce Uknown nullability and add small number of tests specifically
for that feature (together with existing tests).
NOTE: I did not rename `nullsafe-default` back to `nullsafe` to not
pollute blame without need.
Reviewed By: artempyanykh
Differential Revision: D17395743
fbshipit-source-id: 3d3e062f6
Summary:
Get rid of helper class `C`, normal Object serves the same goal well
Don't return values from a function, focus only on nullable
dereferences.
Reviewed By: jberdine
Differential Revision: D17314569
fbshipit-source-id: d70e66b5f
Summary:
1. Split into 3 subclasses for 3 major set of features we test
2. Document a known FP
3. More clear names
Reviewed By: jberdine
Differential Revision: D17285902
fbshipit-source-id: 66e3b5668
Summary:
Let's consolidate "positive" and "negative" cased together by adding an example
of not annotated class as a source of "negative" cases.
Also join the case with modelled methods to the same class.
Reviewed By: jberdine
Differential Revision: D17284101
fbshipit-source-id: e15e60691
Summary:
There are currently plenty of ways to suppress the warning, including Inject, Initializer, and SuppressFieldNotInitialized annotations.
This one (annotating field with Nonnull) is counter-intuitive and does not align with gradual nullsafe
semantics we are working on.
Reviewed By: artempyanykh
Differential Revision: D17281702
fbshipit-source-id: 132e1b687
Summary:
This diff ignores character symbols in the cost results, in order to
avoid FPs from parser code.
Reviewed By: ezgicicek
Differential Revision: D17132053
fbshipit-source-id: d9cf8bd26
Summary: let's always have positive and negative case for each feature we test
Reviewed By: ngorogiannis
Differential Revision: D17206785
fbshipit-source-id: 5791ace48
Summary:
1. Let's move it to the file dedicated to this particular warning.
2. Make it more general (Activity was just a particular case) and describe in comments what it really does.
Reviewed By: ngorogiannis
Differential Revision: D17205919
fbshipit-source-id: 82bf5e9bd
Summary:
1. Remove boilerplate with builder that uses builder initializer; it
demostates a usecase but it is not really relevant for the test so it
distracts attention.
Instead, describe the usecase in the comment
2. Add good and bad cases so it is obvious what exactly do we test.
Reviewed By: artempyanykh
Differential Revision: D17204969
fbshipit-source-id: 005ea078b
Summary:
Let's combine with the one that tests a very similar thing for known
cleanup methods
Reviewed By: ngorogiannis
Differential Revision: D17204206
fbshipit-source-id: dbdbde903
Summary:
1. Remove manipulations with "shadowed" fields and abstract class, I don't believe they produced high quality signal (and no related warnings in the test output).
2. For each failure case provide corresponding success case and the
reverse
Reviewed By: artempyanykh
Differential Revision: D17203240
fbshipit-source-id: c809857ed
Summary:
1. Let's make the intention of the test more visible, also let's provide an example
when the error does occur.
2. `onDestroy` silence "field not nullable" warnigs not only for `View`, but for any objects, so let's use `String` (as an example of a trivial object) instead.
Original diff that introduced the test: D10024458
Reviewed By: artempyanykh
Differential Revision: D17202839
fbshipit-source-id: 037d937e4
Summary: This diff adds models of Java String. In order to keep the precision of cost checker, I fixed cost models for String in this diff too.
Reviewed By: ngorogiannis
Differential Revision: D17203309
fbshipit-source-id: 8cc2814fc
Summary:
See motivation below.
This diff is dealing with FieldNotNullable:
- move not relevant subclasses into dedicated classes and files
- modify the tests so they comply with the standards below
--Motivation--
Gradual mode we are going to introduce is an invasive change in how Infer
treats nullability semantics.
In order to make the change in a controllable way, we need the tests to comply with the
following standards and conventions.
1. For each code peace where we expect a bug to happen, the there should be
corresponding (minimally different from above) peace of code where we expect a bug to NOT happen. (This is to ensure bug is happening for exact reason we think it is happening).
2. Conversely: for each peace of code where we expect a bug to be NOT
present, there shuold be a peace of code where the bug IS happening.
(Otherwise there can be too many reasons for a bug NOT to happen).
3. Convention: end corresponding methods IsOK and IsBUG correspondingly.
4. Keep code examples as small as possible.
Reviewed By: ngorogiannis
Differential Revision: D17183222
fbshipit-source-id: 83d03e67f
Summary:
In next diff, we are going to introduce a new mode of nullsafe
(gradual). For testing, we are going to employ the strategy used by jvillard
for Pulse.
In this diff we split tests into two subfolders, one for the default and one for the gradual
mode.
We are planning to make the gradual mode default eventually. For that, most
new features will make sense for gradual mode, and we will mostly evolve
tests for that mode.
As for 'default' mode, we need to preserve tests mostly to ensure we don't introduce
regressions.
Occasionally, we might make changes that make sense for both modes, in
this (expected relatively rare) cases we will make changes to both set
of tests.
An alternative strategy would be to have two sets of issues.exp files,
one for gradual and one for default mode. This has an advantage of each
java file to be always tested twice, but disadvantage is that it will be
harder to write meaningful test code so that it makes sense for both
modes simultaneously.
Reviewed By: ngorogiannis
Differential Revision: D17156724
fbshipit-source-id: a92a9208f
Summary:
`Present` annotation was an experiment made many years ago that never
got into real usage. The idea was to annotate Optional<> types with
Present, which means that it is safe to call get().
We don't plan to support `Present` annotation for optional types in the
near future.
Support of `Present` annotation requires extra levels of abstraction
that make the changing the behavior and introducing new features harder.
A lot of checks for nullability are written in generic way so they also
check for presense.
Getting rid of that will allow us to simplify our
work for introducing new semantics for nullsafe.
Reviewed By: ngorogiannis
Differential Revision: D17153432
fbshipit-source-id: c5ea9bdf1
Summary:
Since it does not make sense to get ranges of non-integer values and
use them as approximate iteration numbers, this diff ignores control
values that only contain non-integer symbols.
Reviewed By: ezgicicek
Differential Revision: D17130967
fbshipit-source-id: f5ba58d52
Summary: This diff extends size alias domain for keeping one more alias of a Java temporary variable.
Reviewed By: ezgicicek
Differential Revision: D16984082
fbshipit-source-id: 244bbd0ee
Summary:
The purpose of DefinitelyNotNullable currently is bit unclear; let's
rename it so that the intention is obvious.
Reviewed By: artempyanykh
Differential Revision: D16984529
fbshipit-source-id: 696d58315
Summary:
`nullsafe` currently allows the following:
```
public void Nonnull Object willBeOK() { return null; }
```
But disallows the following:
```
public void Object willBeAnIssue() { return null; }
```
This was a deliberate choice made back in 2014.
The motivation was to provide a way to tell the checker "I know it can not be null, trust me".
A huge problem with that approach is that it is extremely non-intuitive and surprising, and contradicts with pretty much everything when Nonnull or similar annotations are used in external world.
This is not the way how checkers should be supressed.
We do provide 2 options to express this intention, namely `assertNotNull` and `assumeNotNull` would do the thing.
This is a much better approach for additional reason: assertNotNull is
granular and applies only to the exact expression that is under
question. In contrast, suppressing the check on the whole function level
make any modifications of a function dangerous.
Reviewed By: artempyanykh
Differential Revision: D16984213
fbshipit-source-id: 0ba0f623b
Summary: This diff prunes array sizes in Java by adding the size alias on the `get_array_length` function calls.
Reviewed By: ezgicicek
Differential Revision: D16983501
fbshipit-source-id: a924af09d
Summary:
It prunes the size of collections when the size function is called in the condition expression. The diff extended the alias domain to understand temporary variables of SIL from Java.
Depends on D16761461
Reviewed By: ezgicicek
Differential Revision: D16761611
fbshipit-source-id: 849c5c71c
Summary:
It revises Java's cast model to keep type in the location when it has a field.
The type information is useful especially when generating ondemand values of Collection elements.
Depends on D16807299
Reviewed By: ezgicicek
Differential Revision: D16807378
fbshipit-source-id: 636e54429
Summary: Ideally, we should be able to handle them like pruning if statements but for now, let's add the test.
Reviewed By: skcho
Differential Revision: D16938842
fbshipit-source-id: 04fae9559
Summary:
Since it is non-sense to get ranges of boolean values, this diff
ignores control values that only contain boolean symbols.
Depends on D16804802
Reviewed By: ezgicicek
Differential Revision: D16804808
fbshipit-source-id: ccb25db4d
Summary: Functions with empty body have unit cost, not zero. The unit cost comes from the start node.
Reviewed By: skcho
Differential Revision: D16855642
fbshipit-source-id: 6b5181faf
Summary:
Before this diff it returned `[0,size-1]`, but which became bottom
when size was given by 0. As a result, it made the both branches of
`if(iterator.hasNext())` unreachable. Similarly, if the size was 1,
it only visited the false branch of the if condition because the
condition value was `[0,0]` at that time.
This diff changes it to return `[0,size]`, so that
* the false branch is reachable when the size is 0
* the both branches are reachable when the size is 1
Reviewed By: ezgicicek
Differential Revision: D16803000
fbshipit-source-id: f8772be27
Summary: We want to keep big O notation as simple as possible in cost analysis reports (especially in diff time). Therefore, let's not show constants/min/max in big O notations even though the resulting asymptotic bound might be inaccurate. Developers can click on the trace and see the actual cost.
Reviewed By: skcho
Differential Revision: D16731351
fbshipit-source-id: 2e16f7eca
Summary: In order to test changes to bigO notation, let's record them in test results.
Reviewed By: skcho
Differential Revision: D16763972
fbshipit-source-id: c1376909b
Summary:
Correct the models of ArrayList initialization. Basically, there are two ways to initialize:
- by setting an initial capacity, which creates an empty list
- by passing another collection as an argument
Before, we had only modeled the second case which was resulting in wrong memory model for the first case. This diff fixes that.
Reviewed By: skcho
Differential Revision: D16711055
fbshipit-source-id: e82faf191
Summary: Models of Java's Collection mistakenly assumed that there was an argument for empty set whereas `Collections.emptySet()` doesn't have any actuals. This diff fixes that an also removes the type argument from the corresponding model definition.
Reviewed By: skcho
Differential Revision: D16582314
fbshipit-source-id: d4304dc60
Summary:
The `represents_multiple_values` flag was adopted to decide whether updating abstract value strongly or weakly. However, the flag was included in the `Val` domain, which is strange, because it is a property of abstract locations, rather than abstract values. This makes the behavior of memory update function depend on the abstract value to update, making its code complicated.
This diff detach the `represents_multiple_values` flag from the `Value` domain, thus the memory update does not depend on the abstract value. Since this is a refactoring, I believe the diff should not make many semantic changes.
Reviewed By: ezgicicek
Differential Revision: D16441734
fbshipit-source-id: 4c10779d7
Summary:
The domain supported path sensitivity wrt to a specific boolean guard `Branch.unlikely`. This isn't used in actual code, so remove it.
Also
- add an .mli to the domain;
- unabbreviate domain name to match analyser name;
- use Payload.read instead of calling Ondemand directly;
- adjust tests.
Reviewed By: mbouaziz
Differential Revision: D16203953
fbshipit-source-id: 743aa4400
Summary:
Move annotation reachability tests to their own directory.
Clean up and complete the tests.
Reviewed By: jvillard
Differential Revision: D16201387
fbshipit-source-id: 8a87a25b7
Summary:
Treat `MainThread` and `WorkerThread` annotations.
Fix wrong test (`AnyThread` cannot call a UI-only method, because it can be called by ANY thread ;) ) See https://developer.android.com/reference/android/support/annotation/AnyThread
Clean up the code a bit.
Reviewed By: jvillard
Differential Revision: D16183798
fbshipit-source-id: 6b7e3b27e
Summary: There were FNs caused by only looking for the immediate predecessors when we were checking the pattern. This diff heuristically chases 4 more predecessors to reduce the number of FNs.
Reviewed By: ngorogiannis
Differential Revision: D16149983
fbshipit-source-id: f65c57a0a
Summary: Adding typechecks to prevent potential FPs like the added test
Reviewed By: ngorogiannis
Differential Revision: D16149511
fbshipit-source-id: 6d3fe0ad4
Summary:
- Add allocation costs to `costs-report.json` and enable diffing over allocation costs.
- Also, let's be more consistent and modular in naming our cost issues.
- introduce a generic issue type `X_TIME_COMPLEXITY_INCREASE` where `X` can be one of the cost kinds. If the function is on the cold start, issue can have the `COLD_START` suffix. Similarly for infinite/zero/expensive calls.
- Change `PERFORMANCE_VARIATION` -> `EXECUTION_TIME_COMPLEXITY_INCREASE`
- Add new issue type for `ALLOCATION_COMPLEXITY_INCREASE_COLD_START` which will be enabled by default
- Refactor cost issues to be more modular and succinct. This also makes addition of a new cost kind very easy by adding the kind into the `enabled_cost_kinds` list in `CostKind.ml`
Reviewed By: mbouaziz
Differential Revision: D15822681
fbshipit-source-id: cf89ece59
Summary:
This is a simple checker that identifies inefficient uses of `keySet` iterator where (not only the key but also) the value is accessed via `get(key)`. It is more efficient to use `entrySet` iterator which already returns both key-value pairs. This optimization would get rid of many extra lookups which can be expensive.
We simply traverse the CFG starting from the loop head upwards and pick up the map that is iterated over. Then, we check in the loop nodes if there is a call to `get(...)` over this map. If, so we report.
Reviewed By: ngorogiannis
Differential Revision: D15737779
fbshipit-source-id: 702465b4e
Summary:
The synthetic methods from `topl.Property` are now nonempty: they
simulate a nondeterministic automaton.
Reviewed By: jvillard
Differential Revision: D15668471
fbshipit-source-id: 050408283
Summary:
Instrument SIL according to TOPL properties. Roughly, the
instrumentation is a set of calls into procedures that simulate a
nondeterministic automaton. For now, those procedures are NOP dummies.
Reviewed By: jvillard
Differential Revision: D15063942
fbshipit-source-id: d22c2f6fa
Summary:
- Rename `invariantModels` to `purityModels`
- Track which arguments are modified in purity models. Before we were invalidating all arguments of impure modeled functions. Instead, now we only invalidate modified args given in the model. This should ideally result in more precision in the analysis.
- Add some more purity models for :`cast`, `new`, `new_array` and `Math.random`
Reviewed By: mbouaziz
Differential Revision: D15535332
fbshipit-source-id: 5395800d9
Summary:
Increases precision a bit. I didn't observe speed problems on what I tested. (But, who knows?)
Closes https://github.com/facebook/infer/pull/799
Reviewed By: jvillard
Differential Revision: D6284206
Pulled By: rgrig
fbshipit-source-id: 6f1e8631f
Summary: This diff substitutes symbolic values for unknown functions in proof obligations to top. The goal of the diff is to avoid generating too many number of proof obligations that cannot be concretized.
Reviewed By: ezgicicek
Differential Revision: D14537542
fbshipit-source-id: 7f8f3bb4b
Summary:
TOPL properties are essentially automata, which specify a bad pattern.
This commit is just a parser for them.
Reviewed By: jvillard
Differential Revision: D14477671
fbshipit-source-id: c38a8ef37
Summary:
Add support for GuardedBy: we deviate from the spec as follows:
- No warnings issued for any access within a private method, unless that method is called from a public method and the lock isn't held when the access occurs.
- Warnings are suppressed with the general RacerD mechanism, ie `ThreadSafe(enableChecks=false)`
- GuardedBy warnings override thread-safety violation warnings on the same access, because GuardedBy has a clearer and simpler contract.
Also, some simplifications, cleanups and perf improvements (eg avoid unreportable procs at the top level as opposed to on each of their accesses).
Reviewed By: jeremydubreil
Differential Revision: D14506161
fbshipit-source-id: b7d794051
Summary:
It assigns symbolic values for global variables in the load commands. However, it does not instantiate the symbols for the global variables yet, which will be addressed in another diff.
Depends on D14208643
Reviewed By: ezgicicek
Differential Revision: D14257619
fbshipit-source-id: f9113c8a3
Summary:
The Eradicate backend is reporting nullable type errors, that are not always necessarily leading to null pointer exceptions.
For example, the analysis is designed to be consistent with the Java type system and report on the following code:
String foo(boolean test) {
Object object = test ? new Object() : null;
if (test) {
return object.toString(); // the analysis reports here
}
}
even though the code will not crash.
In order to make this aspect clear, this diff renames the warnings `Null Method Call` and `Null Field Access` into `Nullable Dereference`
Reviewed By: ngorogiannis
Differential Revision: D14001979
fbshipit-source-id: ff1285283
Summary:
This diff adds a constant to the set of widening thresholds if the
constant is compared to an abstract value in condition expressions.
Each abstract value has its own set of thresholds.
Reviewed By: mbouaziz
Differential Revision: D14147150
fbshipit-source-id: ca0db34d4
Summary: Record where each symbol in a polynomial is coming from: either a loop, function call or a modeled call.
Reviewed By: mbouaziz
Differential Revision: D14047420
fbshipit-source-id: 56d0bd926
Summary: In SIL, Java's array member is a pointer to an array, while C++'s is the array itself. This diff differentiate them in evaluating abstract locations.
Reviewed By: ezgicicek, mbouaziz
Differential Revision: D14021451
fbshipit-source-id: 00f14fe3b
Summary:
- There is no need to use AI to compute a dot product: let's just fold over all nodes, but still do it in order (using the WTO) to report at the right place
- The previous version was computing a dot product on nodes for each node, which was quadratic, the new version is linear
- Report only once, the first time the threshold is reached (if in a loop, report at the loop head)
Reviewed By: ddino
Differential Revision: D14028171
fbshipit-source-id: b4a840c6e
Summary:
Get rid of false positive as in the test by modelling `Double`. Longer term we
should probably prevent biabduction from blocking the angelic analysis on
`Nullable` fields but that seems harder.
Reviewed By: jeremydubreil
Differential Revision: D14005228
fbshipit-source-id: 59ef2ed66
Summary: The Makefile was missing that target and making `make test-replace` at the root of the repo fail.
Reviewed By: ngorogiannis
Differential Revision: D13990483
fbshipit-source-id: 805b5d2a9
Summary:
This will allow to get the numerical results for Cost, Hoisting, Purity without the Inferbo issues.
For now, I still forced Inferbo issues for Cost and Purity to avoid lots of changes in tests, that will go away soon.
Reviewed By: ezgicicek, skcho
Differential Revision: D13826741
fbshipit-source-id: 796d1a50d
Summary: Publish solutions to the lab, and a Docker file and image to get started more quickly with infer hacking.
Reviewed By: mbouaziz
Differential Revision: D13648847
fbshipit-source-id: daf48ad03
Summary: This diff unset powloc and arrayblk values of p when assume(p==Null).
Reviewed By: mbouaziz, jvillard
Differential Revision: D13415366
fbshipit-source-id: a491a957f
Summary:
For abstract values representing one concrete value, create only one symbol instead of two.
Still create two symbols (lb, ub) for abstract values representing multiple concrete values (like array cells).
As a consequence, comparisons of symbolic values are more precise (we can even prove equality). I expect to remove a bunch of FPs.
Another consequence is the disappearance of `.lb` and `.ub` in many reports.
Reviewed By: skcho
Differential Revision: D13072084
fbshipit-source-id: 9bc0b9881
Summary:
It materializes symbolic values of function parameters on-demand. The on-demand materialization is triggered when finding a value from an abstract memory and joining/widening abstract memories.
Depends on D13294630
Main idea:
* Symbolic values are on-demand-ly generated by a symbol path and its type
* In order to avoid infinite generation of symbolic values, symbol paths are canonicalized by structure types and field names (which means they are abstracted to the same value). For example, in a linked list, a symbolic value `x->next->next` is canonicalized to `x->next` when the structures (`*x` and `*x->next`) have the same structure type and the same field name (`next`).
Changes from the previous code:
* `Symbol.t` does not include `id` and `pname` for distinguishing symbols. Now, all symbols are compared by `path:SymbolPath.partial` and `bound_end`.
* `SymbolTable` is no longer used, which was used for generating symbolic values with new `id`s.
Reviewed By: mbouaziz
Differential Revision: D13294635
fbshipit-source-id: fa422f084
Summary:
At function calls, it copies callee's values that are reachable from parameters.
Depends on D13231291
Reviewed By: mbouaziz
Differential Revision: D13231711
fbshipit-source-id: 1e8aed1c4
Summary:
For more deduplications of issues, this diff loosens the condition of
similar bounds. The previous condition of similar bounds was too
strict, so [0,0] and [0,+oo] were not similar.
Depends on D10851762
Reviewed By: mbouaziz
Differential Revision: D10866127
fbshipit-source-id: 4ba912a88
Summary:
This diff preserves values of offset and index separately, rather than
one value of their addition, because premature addition results in
imprecise FPs by the limited expressiveness of the domain.
Reviewed By: mbouaziz
Differential Revision: D10851393
fbshipit-source-id: 1685ead36
Summary: Reports will now be issued for the class loads of the methods specified by the option `--class-loads-roots`.
Reviewed By: jvillard
Differential Revision: D10466492
fbshipit-source-id: 91456d723
Summary:
It avoids checking integer overflow when it definitely cannot happen.
For example, it does not check integer overflow of addition when one
of parameters is a negative number, or underflow of subtraction when
its first parameter is a positive number.
Reviewed By: mbouaziz
Differential Revision: D10446161
fbshipit-source-id: b8c86e1b2
Summary: This diff changes pp of binary operation condition in order to avoid a `make test` failure. For the same `uint64_t` type, it is translated to `unsigned long long` in 64bit mac, but `unsigned long` in 64bit linux, which made a `make test` failure.
Reviewed By: mbouaziz
Differential Revision: D10459466
fbshipit-source-id: 449ab548e
Summary:
Use same code for deciding whether two accesses conflict across java/clang, by adapting that of the clang version.
Eliminate/simplify some code.
Reviewed By: mbouaziz, jberdine
Differential Revision: D10217383
fbshipit-source-id: dc0986d05
Summary:
Make distinct reports on strict mode violations.
For now, restrict to direct violations (UI threads calls transitively a violating method).
Will assess impact and enable indirect reports later (via locks).
Reviewed By: mbouaziz
Differential Revision: D10126780
fbshipit-source-id: 9c75930bc
Summary: Before this diff, the analysis would only lookup the attributes with the classname appearing in the instruction. However, it would fail to find those attributes for inherited and not overridden methods. With this diff, the attributes are now searched recursively in the super classes.
Reviewed By: mbouaziz
Differential Revision: D10007469
fbshipit-source-id: 77d721cba
Summary: This fixes some cases of false positives where the analysis will compare with the wrong overridden methods. This could later be improved with the possibility to do sub-typing comparison on the parameters.
Reviewed By: ngorogiannis
Differential Revision: D9985249
fbshipit-source-id: 7998d8619
Summary:
Keep `--analyzer` around for now for integrations that depend on it.
Also deprecate the `--infer-blacklist-path-regex`,
`--checkers-blacklist-path-regex`, etc. in favour of
`--report-blacklist-path-regex` which more accurately represents what these do
as of now.
Rely on the current subcommand instead of the analyzer where needed, as most of
the code already does.
Reviewed By: jeremydubreil
Differential Revision: D9942809
fbshipit-source-id: 9380e6036
Summary:
Goal of the stack: deprecate the `--analyzer` option in favour of turning
individual features on and off. This option is a mess: some of the options are
now subcommands (compile, capture), others are aliases (infer and checkers),
and they can all be replicated using some straightforward combination of other
options.
This diff: stop using `--analyzer` in tests. It's mostly `checkers` everywhere,
which is already the default. `linters` becomes `--no-capture --linters-only`.
`infer` is supposed to be `checkers` already. `crashcontext` is
`--crashcontext-only`.
Reviewed By: mbouaziz
Differential Revision: D9942689
fbshipit-source-id: 048281761
Summary: It is common on Android code to recycle the `View` object by nullifying them in the `onDestroy()` or `onDestroyView()` methods. In this case, the outer `Fragment` object structure is preserve while the inner `View` object are set to null for the garbage collect to release the memory. However, if the fields are only set to `null` in the `onDestroy*()` methods, those fields cannot be `null` during the active lifecycle of the `Fragment`, so it is not necessary to annotate those fields with `Nullable`.
Reviewed By: mbouaziz
Differential Revision: D10024458
fbshipit-source-id: b05e538d9
Summary:
The method matcher is now used sufficiently it warrants refactoring out into its own module.
Also, kill dev-android-strict-mode and leave starvation-strict-mode as the stronger option.
Reviewed By: jeremydubreil
Differential Revision: D9990753
fbshipit-source-id: 626a70a19
Summary: Always read the attributes from the attributes DB instead of trying to read the attributes from the analysis summaries
Reviewed By: mbouaziz
Differential Revision: D9845085
fbshipit-source-id: aef48e6bf
Summary: No longer report inconsistencies with the annotations with subtyping when the super class is in an external packages since those warnings are not necessarily accurate or actionable.
Reviewed By: ezgicicek
Differential Revision: D9845098
fbshipit-source-id: 1f2bcd739
Summary: Sometimes it's very confusing to see why infer believes a method is running on the UI thread. Make a trace out of all the relevant info.
Reviewed By: mbouaziz
Differential Revision: D9781212
fbshipit-source-id: 6d018e400
Summary:
Turn off by default until mature enough.
Also rename the dev-strict-mode test dir to highlight the dev part.
Reviewed By: mbouaziz
Differential Revision: D9775571
fbshipit-source-id: c3a41bbdf
Summary:
First step in writing an analyzer that is meant to run only on Android core library implementation.
This will, when finished, compute the library entrypoints that may lead to a strict mode violation.
The normal analyzer will use those to statically flag strict mode violations in app code.
Strict Mode is an Android debug mode, where doing certain things (like disk read/write or network activity) on the UI thread will raise an exception. We want to statically catch these, as well as indirect versions (the UI thread takes a lock and another thread holding that lock calls a method that would be a strict mode violation).
Reviewed By: mbouaziz
Differential Revision: D9634407
fbshipit-source-id: c30bcedb3
Summary:
Separate and rename error reporting functions that use the biabduction state.
No checkers should call these functions.
Reviewed By: da319
Differential Revision: D9633579
fbshipit-source-id: 884fcee66
Summary: The `procedure` field in the final report should use the non-ambiguous fully qualified name containing the Java package declaration and the list of parameter types.
Reviewed By: mbouaziz
Differential Revision: D9237522
fbshipit-source-id: e9b0ff664
Summary: Treat calls to Thread.sleep as blocking, even when the timeouts are less than the ANR limit.
Reviewed By: da319
Differential Revision: D9027950
fbshipit-source-id: 001409896
Summary:
Guava subclasses Future in ways that make .get() calls safe from the UI thread.
Treat such methods as skip.
Reviewed By: jeremydubreil
Differential Revision: D9013475
fbshipit-source-id: 38373aa5f
Summary:
This previous FP does not occur anymore, make sure it doesn't regress.
https://github.com/facebook/infer/issues/49
Reviewed By: dulmarod
Differential Revision: D8442842
fbshipit-source-id: b3fde1ad1
Summary:
Litho uses an idiom as follows. `Component.Builder` has an abstract method `T getThis()` which is supposed to be implemented as `{return this;}`.
I believe the reason it's there is to have covariant return types in subclasses, though this doesn't really matter.
We don't do dynamic dispatch, so instead of summarising `getThis` as having a return ownership of `OwnedIf({ 0 })` we just return `Unowned`.
This is generating many false positives, which are really hard to debug.
Here I'm special-casing any abstract method whose return type is equal to that of it's only argument, to return conditional ownership.
Reviewed By: da319
Differential Revision: D8947992
fbshipit-source-id: 33c7e952d
Summary:
Currently, some blocking calls are turning up too many false positives. Adjust severities by fix rate/preexisting numbers.
Also, restrict some calls to exact class, as opposed to superclasses.
Reviewed By: mbouaziz
Differential Revision: D8850599
fbshipit-source-id: 47543d04a
Summary:
- Do not add actuals of a call as unstable.
- Replace access trie with simple set of paths, which is easier to debug/argue correct.
- Fix bug where a prefix path was searched, as opposed to a *proper* prefix.
- Restrict interface to the minimum so that alternative implementations are easier.
Reviewed By: ilyasergey
Differential Revision: D8573792
fbshipit-source-id: 4c4e174
Summary: C/C++ code can, in some cases, generate a large number of temporary (Sil) variables. Since we are already not reporting races on these, not recording them gives some perf back.
Reviewed By: mbouaziz, jvillard
Differential Revision: D8566999
fbshipit-source-id: 148ac46
Summary: Trying to convert a large int literal to an OCaml int raises an exception. The use case here actually needed a float anyway, so add an API for that.
Reviewed By: jeremydubreil
Differential Revision: D8550410
fbshipit-source-id: 382495b
Summary:
I realized that control variable analysis was broken when we had multiple back-edges for the same loop. This is often the case when we have a switch statement combined with continue in a loop (see `test_switch` in `switch_continue.c`) or when we have disjunctive guards in do-while loops.
This diff fixes that by
- defining a loop by its loophead (the target of its backedges) rather than its back-edges. Then it converts back-edge list to a map from loop_head to sources of the loop's back-edges.
- collecting multiple guard nodes that come from potentially multiple exit nodes per loop head
In addition, it also removes the wrong assumption that an exit node belongs to a single loop head.
Reviewed By: mbouaziz
Differential Revision: D8398061
fbshipit-source-id: abaf288
Summary:
We need to report on non-private methods (the opposite even leads to FPs sometimes on deadlocks). To do this, the domain needs to change so that the interpretation of an order pair `a,b` is no longer "lock `a` is taken in the *current method* and held until lock `b` is taken". Instead the meaning is now "lock `a` is taken in some method *of the same class with the current method* and is held until `b` is taken".
These changes are quite drastic because the previous implementation optimised extensively around the previous use case.
Reviewed By: mbouaziz
Differential Revision: D8395351
fbshipit-source-id: a2bd22b
Summary:
The deadlock reports (the actual string) were too low level, in order to avoid bug hash clashes. Now that we deduplicate this is less of an issue, so it's an opportunity to improve readability.
```
Potential deadlock.
Trace 1 (starts at `void Interproc.interproc1Bad(InterprocA)`) first locks `this` in class `Interproc*` (line 9 in `void Interproc.interproc1Bad(InterprocA)`) and then locks `b` in class `InterprocA*` (line 14 in `void Interproc.interproc2Bad(InterprocA)`).
Trace 2 (starts at `void InterprocA.interproc1Bad(Interproc)`), first locks `this` in class `InterprocA*` (line 37 in `void InterprocA.interproc1Bad(Interproc)`) and then locks `d` in class `Interproc*` (line 42 in `void InterprocA.interproc2Bad(Interproc)`).
```
Reviewed By: mbouaziz
Differential Revision: D8394978
fbshipit-source-id: 671ccb0
Summary:
The deadlock reports (the actual string) were too low level, in order to avoid bug hash clashes. Now that we deduplicate this is less of an issue, so it's an opportunity to improve readability.
```
Potential deadlock.
Trace 1 (starts at `void Interproc.interproc1Bad(InterprocA)`) first locks `this` in class `Interproc*` (line 9 in `void Interproc.interproc1Bad(InterprocA)`) and then locks `b` in class `InterprocA*` (line 14 in `void Interproc.interproc2Bad(InterprocA)`).
Trace 2 (starts at `void InterprocA.interproc1Bad(Interproc)`), first locks `this` in class `InterprocA*` (line 37 in `void InterprocA.interproc1Bad(Interproc)`) and then locks `d` in class `Interproc*` (line 42 in `void InterprocA.interproc2Bad(Interproc)`).
```
Reviewed By: mbouaziz
Differential Revision: D8379328
fbshipit-source-id: bc33983
Summary: Deadlocks can be very noisy, so dedup reports on same line by showing only the one with the shortest trace and a count of the suppressed ones.
Reviewed By: mbouaziz
Differential Revision: D8351148
fbshipit-source-id: 8913db2
Summary: Introduce an annotation that forces the summary of a method to be free of blocking events, without suppressing other reports.
Reviewed By: jeremydubreil
Differential Revision: D8276787
fbshipit-source-id: be9eed8
Summary: Create mechanism for suppressing starvation reports. To do that, refactor and expose a Checkers function.
Reviewed By: mbouaziz
Differential Revision: D8259583
fbshipit-source-id: f5b5a63
Summary:
Use the component of the abstract state `events` to report. This set contains reachability facts about blocking calls and lock acquisitions.
The other component, `order`, contained pairs of a reachable event `e'` from an event option with the semantics that if the option is `None` then we have an element that now goes into `events`, and if the option is `Some e` then the element represents a lock acquired and a trace *from* `e` to `e'`
Now, `order` can be simplified to proper pairs of events, without the option.
Reviewed By: jvillard
Differential Revision: D8227665
fbshipit-source-id: e6f4dac
Summary:
It's useful to test that the bucket a given error is classified as doesn't
change over time without notice.
This records the bucket for *all* the tests, even though some never produce a
bucket. This is to be on the safe size instead of risking to forget adding the
bucket information when the test changes, or when copy/pasting from a test that
doesn't have buckets to one that does.
The implementation is pretty crude: it greps the beginning of the qualifier
string for a `[bucket]`.
Reviewed By: mbouaziz
Differential Revision: D8236393
fbshipit-source-id: b3b1eb9
Summary:
Change the license of the source code from BSD + PATENTS to MIT.
Change `checkCopyright` to reflect the new license and learn some new file
types.
Generated with:
```
git grep BSD | xargs -n 1 ./scripts/checkCopyright -i
```
Reviewed By: jeremydubreil, mbouaziz, jberdine
Differential Revision: D8071249
fbshipit-source-id: 97ca23a
Summary:
There can be multiple reports per line, especially when calling in a method which has itself multiple reports.
When reporting at the callsite, report only the issue with the highest severity (picked manually per type of event).
Deadlocks are not de-duplicated, as they are relatively rare and the info in mupltiple reports may be important.
Reviewed By: mbouaziz
Differential Revision: D8160940
fbshipit-source-id: ea6a5c0
Summary: Track and surface the reasons why a method is assessed to run on the UI thread.
Reviewed By: mbouaziz
Differential Revision: D8096099
fbshipit-source-id: 2403c6c
Summary:
The reported location was always the start of the enclosing procedure, which is wrong in many ways.
A nice side-effect is that some code can then be eliminated and Ondemand.analyze used, avoiding getting the procdescs in the process.
Reviewed By: jeremydubreil
Differential Revision: D8056306
fbshipit-source-id: 67c2c8d
Summary:
Before we were computing the size of an abstract state (`range`) using the `NonNegativeBound` domain but it wasn't able to express product of symbolic values.
This diff introduces a domain for that.
The range of an interval is still computed in `NonNegativeBound` but then the product is done in `TopLiftedPolynomial` so all costs end up being of that type.
The //symbols// of a polynomial are `NonNegativeBound` (so the polynomial only represent non-negative values, perfect for a cost), which handles substitution correctly, i.e. it gives zero instead of negative values.
Reviewed By: ddino
Differential Revision: D7397229
fbshipit-source-id: 6868bb7
Summary:
The annotation UiThread can, and is, used on classes as opposed to just methods, so extend the modelling to account for this.
Also, consider the annotation hereditary.
Reviewed By: jeremydubreil
Differential Revision: D7910762
fbshipit-source-id: 0df2c81
Summary: Without the class name, it is not always clear from the error message where the method expecing non-null parameters defined.
Reviewed By: mbouaziz
Differential Revision: D7919492
fbshipit-source-id: 044fb83
Summary:
Make the starvation checker enabled by default.
Add a deadlock issue type, distinct to starvation, which will be kept for UI thread starvation.
Add checks so that checker will do nothing on non-Java code.
Reviewed By: mbouaziz, ddino
Differential Revision: D7908381
fbshipit-source-id: 889f373
Summary: Calling Future.get from UI thread, or under a lock the UI thread may try to take has been associated with ANRs.
Reviewed By: ddino
Differential Revision: D7859296
fbshipit-source-id: b87bd94
Summary:
This simplifies the frontends and backends in most cases. Before this diff,
returning `void` could be modelled either with a `None` return, or a dummy
return variable with type `Tvoid`. Now it's always the latter.
Reviewed By: sblackshear, dulmarod
Differential Revision: D7832938
fbshipit-source-id: 0a403d1
Summary:
The abstract interpreter tried to handle exceptional control-flow by propagating the *pre* of a block that threw an exception rather than the *post*.
This was a half-measure that isn't correct when an exception-throwing instruction isn't in the middle of a block.
The handling of exceptions wasn't actually used anywhere and was leading to further hacks in `ProcCfg`, so let's get rid of it.
Reviewed By: mbouaziz, jvillard
Differential Revision: D7843872
fbshipit-source-id: 2a4a815
Summary: We already suppress race reports if the field is marked in this way; makes sense to do the same thing for these reports.
Reviewed By: ngorogiannis
Differential Revision: D7589275
fbshipit-source-id: 8f0aeab
Summary:
Report nullable inconsistencies by relying on the bytecode, and not on the presence of analysis summary on disk.
This use the `--external-java-packages` to avoid reporting inconsistencies outside of the codebase.
Reviewed By: sblackshear
Differential Revision: D7481101
fbshipit-source-id: 281135d
Summary: This was causing false positives when returning the constant integer 0.
Reviewed By: sblackshear
Differential Revision: D7330143
fbshipit-source-id: 45d19dd
Summary:
At the moment, Java and Clang sources/sinks live in the same inferconfig entry.
If we try to parse a Java procedure that happens to be an invalid Clang qualified name (e.g., `MyClass.<init>`),
parsing will crash.
As a temporary fix, throw an exception and catch it instead.
In the future, we can avoid this by requiring that JSON source/sink specifications to indicate the language.
Reviewed By: mbouaziz
Differential Revision: D7291880
fbshipit-source-id: f8f4502
Summary: Add a new command-line option `--external-java-packages` which allows the user to specify a list of Java package prefixes for external packages. Then the analysis will not report non-actionable warnings on those packages (e.g., inconsistent `Nullable` annotations in external packages).
Reviewed By: jeremydubreil
Differential Revision: D7126960
fbshipit-source-id: c4f3c7c
Summary:
See comment--`Prop(resType = blah) myProp` will generate `.myProp`, `.myPropRes`, and `.myPropAttr`, and any of them can be used to set the prop.
Because our annotation parameter parsing is a bit primitive, handle this by simply checking the `Res` and `Attr` suffixes for every `Prop`.
This shouldn't lead to false negatives because these methods will only exist if the `resType` annotation is specified anyway.
Reviewed By: jeremydubreil
Differential Revision: D6955362
fbshipit-source-id: ec59b21
Nikos Gorogiannis
Sungkeun Cho
Ezgi Çiçek
Mitya Lyubarskiy
Radu Grigore
Josh Berdine
Jeremy Dubreil
Andrew Adams-Moran
Radu Grigore
Dino Distefano
Wenzhe Lu
Mehdi Bouaziz
Boris Valkov
Jules Villard
Nikos Gorogiannis
Martino Luca
Julian Sutherland
Sam Blackshear
Tony Hu