Summary: This diff refactors Java specific `PatternMatch` functions into its own module. When `PatternMatch.ml` was originally created, it was mainly for Java but now it also supports ObjC. Let's refactor it to reflect the Java/ObjC separation: move all functions that operate on Java procnames into Java submodule.
Reviewed By: jvillard
Differential Revision: D22816504
fbshipit-source-id: ff6b64b29
Summary:
This avoids wasting potentially large amount of work in some
pathological situations. Suppose `foo()` has D specs/disjuncts in its
Pulse summary, and consider a node that calls `foo()` N times, starting
with just one disjunct:
```
[x]
foo()
[x1, ..., xD]
foo()
[y1, ..., yD^2]
foo()
...
```
At the end we get `D^N` disjuncts. Except, currently (before this diff),
we prune the number of disjuncts to the limit L at each step, so really
what happens is that we (very) quickly reach the L limit, then perform
`L*D` work at each step (where we take "apply one pre/post pair to the
current state" to be one unit of work), thus doing `O(L*D*n)` amount of
work.
Instead, this diff counts how many disjuncts we get after each
instruction is executed, and we already reched the limit L then doesn't
bother accumulating more disjuncts (as they'd get discarded any way),
and crucially also doesn't bother executing the current instruction on
these extra disjuncts. This means we only do `O(L*n)` work now, which is
exactly how we expect pulse to scale: execute each instruction (in
loop-free code) at most L times.
This helps with new arithmetic domains that are more expensive and
exhibit huge slowdowns without this diff but no slowdown with this diff
(at least on a few examples).
Reviewed By: skcho
Differential Revision: D22815241
fbshipit-source-id: ce9928e7c
Summary:
The old --topl-only is now --topl-biabd-only, and there's also
--topl-pulse-only. This is WIP: the latter runs pulse, but it doesn't yet
extract Topl errors from pulse summaries. (The citv part of pulse path
conditions appears to have the necessary information.)
Reviewed By: jvillard
Differential Revision: D22815250
fbshipit-source-id: a01792945
Summary:
This diff:
1. Adds general capability to model any field as nullable /
non-nullable.
2. Uses it for Boolean.TRUE and Boolean.FALSE
Reviewed By: artempyanykh
Differential Revision: D22794226
fbshipit-source-id: 95f586592
Summary: D17500386 had added the ability to give symbolic values on functions returning exceptions. However, this might cause FPs or cryptic complexity reports (especially with subclass heuristics). This diff aims to revert it back.
Reviewed By: skcho
Differential Revision: D22764266
fbshipit-source-id: 1615544d8
Summary: We model internal builtin `__new` function to return a non-null value. This fixes nullptr_dereference false positives where we explicitly check the result of a function call for nullptr when the function returns a newly created object.
Reviewed By: jvillard
Differential Revision: D22772217
fbshipit-source-id: 37d209697
Summary:
This stopped compiling on my Debian and it seems hard to fix. It was
already having compilation issues between osx and Linux but here I don't
know how to detect which type it wants since the OS is Linux too.
Reviewed By: ezgicicek
Differential Revision: D22728282
fbshipit-source-id: 818ae87e6
Summary:
This step does extra normalization so it's useful to see what's going on
when debugging. Log stuff in the html debug of the exit node.
Reviewed By: da319
Differential Revision: D22596248
fbshipit-source-id: cde3bbb6c
Summary:
Pulse has models for iterators that make them use a fake field to
remember the element of the collection they point to. But, not all
methods are modelled, and some of them look at the real field, eg
`operator==`. Since we don't update the real field in the model, this
causes imprecision.
The imprecision was visible in pudge.
Reviewed By: skcho
Differential Revision: D22576003
fbshipit-source-id: 2af6be646
Summary:
The java frontend used an unsound flow insensitive class analysis to devirtualize
some virtual calls. We remove it and let the recent devirtualizer preanalysis do the job.
This unsoudness in the Java frontend may have been here for a long time. Removing it may
modify several analysis results (specially Nullsafe) where virtual calls may look different
now.
Reviewed By: jvillard
Differential Revision: D22662739
fbshipit-source-id: c45296dce
Summary:
Changing the order of the superclasses of a struct exposes a bug in both biabduction and the devirtualiser where a method would be resolved into a still virtual method (an interface method).
The reason is that we don't check whether a super class is an interface before exploring it, and seemingly we assume that there is only one (first) superclass worth exploring. This also ignores multiple inheritance in C++.
To fix this, refactor the resolution to a complete search (not just the first super class!) which ignores Java interface methods. Also moved it to `Tenv` so that both biabduction and the devirtualiser can use it.
Reviewed By: jvillard
Differential Revision: D22357488
fbshipit-source-id: 54b96c1f4
Summary:
Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/lodash/lodash/releases">lodash's releases</a>.</em></p>
<blockquote>
<h2>4.17.16</h2>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="d7fbc52ee0"><code>d7fbc52</code></a> Bump to v4.17.19</li>
<li><a href="2e1c0f22f4"><code>2e1c0f2</code></a> Add npm-package</li>
<li><a href="1b6c282299"><code>1b6c282</code></a> Bump to v4.17.18</li>
<li><a href="a370ac8140"><code>a370ac8</code></a> Bump to v4.17.17</li>
<li><a href="1144918f35"><code>1144918</code></a> Rebuild lodash and docs</li>
<li><a href="3a3b0fd339"><code>3a3b0fd</code></a> Bump to v4.17.16</li>
<li><a href="c84fe82760"><code>c84fe82</code></a> fix(zipObjectDeep): prototype pollution (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4759">#4759</a>)</li>
<li><a href="e7b28ea6cb"><code>e7b28ea</code></a> Sanitize sourceURL so it cannot affect evaled code (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4518">#4518</a>)</li>
<li><a href="0cec225778"><code>0cec225</code></a> Fix lodash.isEqual for circular references (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4320">#4320</a>) (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4515">#4515</a>)</li>
<li><a href="94c3a8133c"><code>94c3a81</code></a> Document matches* shorthands for over* methods (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4510">#4510</a>) (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4514">#4514</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/lodash/lodash/compare/4.17.15...4.17.19">compare view</a></li>
</ul>
</details>
<details>
<summary>Maintainer changes</summary>
<p>This version was pushed to npm by <a href="https://www.npmjs.com/~mathias">mathias</a>, a new releaser for lodash since your current version.</p>
</details>
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Pull Request resolved: https://github.com/facebook/infer/pull/1291
Reviewed By: dulmarod
Differential Revision: D22665400
Pulled By: jvillard
fbshipit-source-id: f40ff0590
Summary:
This was removed in D19272627 but not added back in D21998484.
Pull Request resolved: https://github.com/facebook/infer/pull/1290
Reviewed By: dulmarod
Differential Revision: D22665397
Pulled By: jvillard
fbshipit-source-id: 8417e405a
Summary: We recently changed the translation of NSArray literals in a way that we pass a different type of argument to `arrayWithObjects:count`, such that the biabduction model doesn't work anymore. So we remove the model for now.
Reviewed By: skcho
Differential Revision: D22691611
fbshipit-source-id: 03cd940ed
Summary:
Merging global type environments for Java needs some form of non-trivial type definition merging because:
- The frontend is likely non-deterministic, so it can capture the same type differently.
- There are classes that appear with two distinct definitions (usually ordered by inclusion) when one is produced by an ABI-like compilation process (so only public fields/methods would appear for example), and one full version.
- The frontend produces dummy versions (empty definitions), and full ones.
- The location information is variously missing/present.
This diff tries to strike a balance between a full semantic merge (which depends on the frontend/buck integration) and the current code which "merges" by clobbering old definitions with new ones.
One side-effect of this diff is that code cannot expect a special order for supers.
Reviewed By: jvillard
Differential Revision: D22630286
fbshipit-source-id: fc66c7000
Summary:
This diff adds translation of `arrayWithObjects:count:`. In the previous implementation it was
translated as if it was `arrayWithObjects:`, but their function parameters are different.
In this diff, it translates an array literal `NSArray* a = @ [ 2, 3 ];` to
```
n$1=NSNumber.numberWithInt:(2:int)
n$2=NSNumber.numberWithInt:(3:int)
temp[0]:objc_object*=n$1
temp[1]:objc_object*=n$2
n$3=NSArray.arrayWithObjects:count:(temp:objc_object* const [2*8],2:int)
a:NSArray*=n$3
```
where `temp` is an additional local variable declared as array.
See,
https://developer.apple.com/documentation/foundation/nsarray/1460145-arraywithobjectshttps://developer.apple.com/documentation/foundation/nsarray/1460096-arraywithobjects?language=objc
Reviewed By: jvillard
Differential Revision: D22631305
fbshipit-source-id: 5be0a55d4
Summary:
Add a test to the repo to try and detect perf regressions in pulse.
Currently analyzed in ~0.1s. With `--pudge`, takes ~10s.
Sledge does eager normalization and canonicalization when incorporating new facts into formula contexts and the algorithm is polynomial in the number of equalities. This example generates one equality per location in the array => boom. This bypasses the recency model of arrays because the formula needs to be constructed before it can be simplified to get rid of dead variables.
The new arithmetic is not as complete as sledge's algorithm but linear in time. We could use it to simplify the formula *before* passing it to sledge. In fact, that was the original motivation.
Reviewed By: skcho
Differential Revision: D22574366
fbshipit-source-id: e9044ae09
Summary:
When applying function summaries, we are careful not to violate the
summary's assumptions about non-aliasing. For example, the summary we
generate for `foo(x,y) { *x = *y; }` will have `x` and `y` be allocated
to two different `AbstractValue.t` in the heap, representing
disjointness.
However, the current logic is too coarse and also rejects passing the
same pure value to functions that made no assumption about them being
equal or different, eg `goo(int x,int y) { int z = x + y; }`. This is
because the corresponding `AbstractValue.t` are different in the
callee's summary, but are represented by only one same value in callers
such as `goo(i,i)`.
This diff restricts the "don't violate aliasing" condition to only
consider heap-allocated values. This is consistent with separation logic
by the way: we use the implication `x|->- * y|->- |- x≠y`, which is
valid only when both `x` and `y` are both allocated in the heap as in
the left-hand-side of `|-`.
Reviewed By: skcho
Differential Revision: D22574297
fbshipit-source-id: 206a18499
Summary:
This will allow all the analyses to be able to call closures without any special treatment: we transform the call to variables that point to closures into normal function calls. We treat only ObjC blocks at the moment, with C++ lambdas to be done as a next step.
We aimed to achieve certain results in Pulse (see tests: avoid memory leaks and NPEs FPs) while also keeping the biabduction analysis working as before.
We also checked that for the examples analyzed Pulse behaves like the correct semantics of ObjC programs with blocks.
Reviewed By: jvillard
Differential Revision: D22547333
fbshipit-source-id: efe56ed51
Summary: Lambda is called using `operator()`. We need to know the information of captured variables when `operator()` procedure is being analysed. This diff records lambda captured variables in `operator()` procdesc. The complication arises from the fact that procdesc for `operator()` is created before translating lambda expression or during the translation of lambda expression where captured variables are translated. To solve this issue, we update existing `operator()` procdesc attributes with captured variable information when we translate lambda expression.
Reviewed By: jvillard
Differential Revision: D22374495
fbshipit-source-id: 44909adea
Summary:
This diff fixes a bug that eval_arr misses the case when a stack
variable points to an array.
Reviewed By: ezgicicek, roro47
Differential Revision: D22596999
fbshipit-source-id: 7c4a13d01
Summary: Add cost model for most common `NSString` functions in cost analysis
Reviewed By: skcho
Differential Revision: D22433005
fbshipit-source-id: 2f57bbda9
Summary: If a node is unreachable and the cost of the node is Top, we were giving Top cost :( Let's fix it.
Reviewed By: skcho
Differential Revision: D22548269
fbshipit-source-id: d79743669
Summary:
We update the type of captured variables to include information about capture mode (`ByReference` or `ByValue`) both for procdesc attributes and the closure expression.
For lambda: closure expression now contains correct capture mode for capture variables. Procdesc still does not contain information about captured variables which we will address in the next diff.
For objc blocks: at the moment all captured variables have mode `ByReference`. Added TODOs to fix this.
Reviewed By: jvillard
Differential Revision: D22572054
fbshipit-source-id: 4c88678ee
Summary: This diff prints where the cost becomes top by calling `html_debug_new_node_session`. This will print them in the start node of the procedure in html. There are already printing functions in `get_instr_node_cost_record`.
Reviewed By: ezgicicek
Differential Revision: D22547578
fbshipit-source-id: 257e957c0
Summary:
The frontend was hackily adding protocols as superclasses in the tenv, with the implicit encoding that the first element in the list was the actual superclass. This was clearly very fragile.
Protocols are not used in the backend at the moment, so for now we will remove them from the list of superclasses to have more consistency in the tenv.
Reviewed By: ngorogiannis
Differential Revision: D22525078
fbshipit-source-id: 2aef1fab1
Summary: This diff extends the value domain to express multiple markers.
Reviewed By: ngorogiannis
Differential Revision: D22524864
fbshipit-source-id: b8e4af2eb
Summary:
As title
Model `NSString` as `JavaString`.
Since `NSArray` does not contain information about its type of element, we do not use associate string with collection as in Java and C++. In Java, String model is implemented using java collection, and for C++, string model is implemented using vector.
So instead, we use existing `JavaString` model.
Reviewed By: skcho
Differential Revision: D22431949
fbshipit-source-id: 7cdde1ad7
Summary:
After merging https://github.com/facebook/facebook-clang-plugins/pull/20, we can now use Actions here to download a facebook-clang custom clang Release here and use it to build C Analyzers during CI, as well as Java Analyzers.
1. had to change `matrix.os: macos-latest` to `matrix.os: macOS-latest`. I guess that's what I typed for the fb clang build, and `curl`ing a Release asset is case-sensitive.
2. Add `jq` to installed packages on mac - we need it for parsing GitHub's API responses
3. Add the logic for fetching a release asset (we currently only look for the `"latest"` release) and downloading the properly-named clang based on OS. Then unpack it and update the `opam` files so we build with clang.
Note: I would have used this Action: https://github.com/dsaltares/fetch-gh-release-asset/ for fetching a Release asset, but unfortunately it seems to be in a fairly new state and it's a Docker Action, which means it doesn't support macOS. The logic in the fetch clang step is roughly based off of this action's logic.
Pull Request resolved: https://github.com/facebook/infer/pull/1286
Reviewed By: da319
Differential Revision: D22475973
Pulled By: jvillard
fbshipit-source-id: cb95b51b9
Summary:
There is nothing specific to the Ses representation in the
implementation, and no uses within Ses.
Reviewed By: jvillard
Differential Revision: D22455725
fbshipit-source-id: 6f0059873
Summary:
In preparation for more smoothly interoperating with ICS's functional
array theory.
Reviewed By: jvillard
Differential Revision: D22401039
fbshipit-source-id: 4de39c38a
Summary:
It is not needed or very meaningful since the addition of type-based
disambiguation.
Reviewed By: jvillard
Differential Revision: D22401035
fbshipit-source-id: 31996f946
Summary:
The first-order context is induced by the pure part, so no need to
compare it.
Reviewed By: jvillard
Differential Revision: D22381645
fbshipit-source-id: 29fff13a3
Ezgi Çiçek
Jules Villard
Radu Grigore
Mitya Lyubarskiy
Daiva Naudziuniene
David Pichardie
Qianyi Shu
Nikos Gorogiannis
dependabot[bot]
Jaehwang Jerry Jung
Dulma Churchill
Sungkeun Cho
Amar Paul
Sora Morimoto
Josh Berdine