Summary:
Start working on a simple model of LLVM with the ultimate goal of
handling relevant and/or tricky aspects of LLVM and LLAIR and then
formalising the translation from LLVM to LLAIR.
This is a complete initial model of everything that we are interested in
except for exceptions, which should be tricky. Also no thought has gone
into the treatment of poison and the undefined value, so the treatment
is naive, which is at least partially justified because we are
interested in the semantics of LLVM IR after the optimisation passes
have run.
Include some sanity checking theorems.
Reviewed By: jberdine
Differential Revision: D16731885
fbshipit-source-id: fd53949fe
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:
It renames a function to make it clear what it does.
Depends on D16761451
Reviewed By: ezgicicek
Differential Revision: D16761461
fbshipit-source-id: b989cc274
Summary: We do not need to keep the elements type of vector in the field.
Reviewed By: ezgicicek
Differential Revision: D16761451
fbshipit-source-id: 6d5384662
Summary: Add a sanity check that looks up the `INFERVERSION` environment variable and, if set, checks that the current binary matches that version.
Reviewed By: skcho
Differential Revision: D16761575
fbshipit-source-id: 9d5c32220
Summary:
Incremental analysis isn't behaving as expected in production, and I think the deletion and re-creation of the results directory is why
Adding logging to test this theory
Reviewed By: ngorogiannis
Differential Revision: D16730426
fbshipit-source-id: 0a670cabf
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: Remove duplicate `s` when printing the time taken by the analysis
Reviewed By: ngorogiannis
Differential Revision: D16710277
fbshipit-source-id: 3ba7f6693
Summary:
It adds a vector model of `data` method.
Depends on D16687280
Reviewed By: ezgicicek
Differential Revision: D16689400
fbshipit-source-id: 156016b3c
Summary:
It adds a model of vector::push_back
Depends on D16687225
Reviewed By: ezgicicek
Differential Revision: D16687269
fbshipit-source-id: 9d2a73fca
Summary:
It enables pruning of vector's size when the return value of the function call of `vector::size` is pruned.
Depends on D16687167
Reviewed By: ezgicicek
Differential Revision: D16687225
fbshipit-source-id: 793a21b3a
Summary:
Add logging for the number of procedures whose summaries are invalidated by incremental analysis
This will help verify that incremental analysis is working as expected in production
Reviewed By: ngorogiannis
Differential Revision: D16686911
fbshipit-source-id: 53c89c3bb
Summary:
It generates vector value ondemand when it is given as a parameter.
Depends on D16645589
Reviewed By: ezgicicek
Differential Revision: D16645624
fbshipit-source-id: 7498c8ab2
Summary:
This diff makes it sure that Inferbo does nothing on relational domain
at function calls when the command line option for them is not given.
Reviewed By: ezgicicek
Differential Revision: D16647903
fbshipit-source-id: 74ef251fe
Summary:
Use version 9386890 with fixes to setup script and less # of targets
to build.
update-submodule: facebook-clang-plugins
Reviewed By: jvillard
Differential Revision: D16604337
fbshipit-source-id: f371345ac
Summary: Test that cost analysis works with incremental analysis enabled
Reviewed By: ezgicicek
Differential Revision: D16620101
fbshipit-source-id: b41403954
Summary:
The models are only for biabduction so try to make that clearer in the
code and documentation.
Reviewed By: skcho
Differential Revision: D16603147
fbshipit-source-id: 4a2be53de
Summary:
It's not being worked on and is not in a state where it works.
It would probably better to write this as a script of some kind or else
resurrect this subcommand in a form where it behaves more like a script,
ie fork/execs infer analyses instead of having them be function calls
(but then it might as well *be* a script as it would likely be more
flexible).
In any case...
youarealreadydead
Reviewed By: ezgicicek
Differential Revision: D16602417
fbshipit-source-id: d0d129539
Summary:
These have proved to be too fragile to maintain as they would often break
compilation of user code. They have been off by default for more than a year
now (D7350715).
Removing the include models shows a more accurate picture of what infer results
look like in production. As such, lots of tests have changed, mostly
biabduction but also in inferbo. SIOF was using include-based models too but
now libc++ is better and iostreams are implemented in a way that SIOF
understands (instead of being magical creatures) so nothing changed there.
Reviewed By: skcho
Differential Revision: D16602171
fbshipit-source-id: ce38f045b
Summary:
Write a test for the invalidation of changed procedures
Reverse analysis graph for this test: https://fburl.com/graphviz/ybidpidq
The procedures marked as changed are `a` and `d`, and this causes `a,b,c,d,e,main` to be invalidated as expected
Reviewed By: jvillard
Differential Revision: D16579526
fbshipit-source-id: cbec304ce
Summary:
Add test `incremental_analysis_remove_file` to the toplevel makefile so that it is called by `make test` etc
Also swapped the src_before and src_after files so the test checks file removal instead of addition.
Reviewed By: jvillard
Differential Revision: D16562340
fbshipit-source-id: 79bab5f66
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: Sometimes programmers use integer underflow to get a maximum number of that type. This diff assumes that integer underflows from the syntactical form `(unsigned 0) - constant` is intended by the programmer, and suppresses the alarms of which.
Reviewed By: ezgicicek
Differential Revision: D16560639
fbshipit-source-id: 206f30dbc
Summary:
Count the following:
- how many procedures were *actually* analyzed (i.e. some checkers ran
on them)
- how many times an analysis result was retrieved from the local cache
and how many times it was missed
Reviewed By: skcho
Differential Revision: D16561867
fbshipit-source-id: 8c43ce13c
Summary:
Instead of `let incr_foo () = global_stats.foo <- global_stats.foo + 1` where you have to
check that you copy/pasted the right stuff and substituted `foo`
everywhere, write `let incr_foo () = incr Fiels.summary_foo` where
there's less room for errors.
Reviewed By: artempyanykh
Differential Revision: D16561868
fbshipit-source-id: 77ea09bef
Summary:
Before this diff, it gave up pruning of linear bound by minmax bound.
For example, `overapprox_min (x+c1, c2+min(d1,y))` was `x+c1`.
However, we can get a bit more preciser value as follows.
```
overapprox_min (x+c1, c2+min(d1,y))
<= min (x+c1, c2+d1)
= c1+min(c2+d1-c1, x)
```
Reviewed By: ezgicicek
Differential Revision: D16543837
fbshipit-source-id: 8fdbce097
Summary:
- make most behaviours independent of the java version so that either works fine without user intervention
- modify regexp used to parse `javac` output to work for all versions
- no need to be sure we are in Java 11 to match java 11-only method name in quandary
- for the rest, provide a command-line flag to specify the java version manually in case it differs from the version that infer was built against
- this only affects the Maven integration for now
To do all that, also change the configure script to record the version of java instead of just a boolean for whether it's >= 10.
Reviewed By: ezgicicek
Differential Revision: D16493988
fbshipit-source-id: 622e91b25
Summary:
The default values of config options can sometimes depend on build-time
configuration values. This makes checking that the manuals "remain the same"
trickier as the manuals can be different depending on the platform. This
removes *all* default values from the checked-in manuals. We could be more
fine-grained and scrub only the values that are susceptible to change but for
now this is probably good enough.
This is done by implementing new options `--help-scrubbed` and
`--help-scrubbed-full` and using these in our tests instead of `--help` and
`--help-full` (which remain unaffected).
Also don't wrap the default values in `$(i,...)` anymore because the defaults
can trigger line breaks and then the man page is ill-formatted because that
format is stupid.
Reviewed By: mityal
Differential Revision: D16543779
fbshipit-source-id: bc929ff8c
Summary:
This diff prevents that the latest prune value is overwritten as top
from callees.
Reviewed By: jvillard
Differential Revision: D16540391
fbshipit-source-id: bdd5b42ed
Summary:
This diff improves the precision of the mod operator.
For example, result of x % c (when x>=0 and c>0) is
(before) [0, c-1]
(after) [0, min(c-1,x)]
Reviewed By: ezgicicek
Differential Revision: D16518578
fbshipit-source-id: a68660ee7
Summary: This diff tries to do weak update for the abstract locations by pointer arithmetic, e.g. `p[n]` or `p+n`, even if the type of `p` is declared as a simple pointer, not an array.
Reviewed By: ezgicicek
Differential Revision: D16458367
fbshipit-source-id: 3b4cdd7e4
Summary:
A test that records the expected output of:
- reverse analysis call graph
- introduced/pre-existing/fixed issues
- cost analysis results
Currently only the call graph is non-empty.
Reviewed By: PhoebeMay
Differential Revision: D16495470
fbshipit-source-id: f186d73d2
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:
Currently bitcode produced with `sledge buck link` can have missing
symbols that are clearly defined in the source. For example consider a
symbol `awesome_function` that is defined in the libraries linked in but
not in the produced binary (despite being reachable from main).
`llvm-nm` of the bitcode produced by `llvm-link` might look like:
```
U awesome_function
t awesome_function.1892
```
Some our `awesome_function` is undefined and its definition is called
`awsome_function.1892` for some reason and is local. I think this is because symbol get internalized too early and then they get renamed and somehow lost. Not sure why `llvm-link` behaves this way sometimes.
This patch removes internalization from `llvm-link` and puts it into `opt`, where it doesn't cause problems.
Reviewed By: jvillard
Differential Revision: D16494153
fbshipit-source-id: aad9053a4
Summary: The reverse analysis call-graph is logged if `--debug-level-analysis` > 0, so that its value can be inspected for tests
Reviewed By: jvillard
Differential Revision: D16440567
fbshipit-source-id: 1ec6af1f3
Summary:
Pulse didn't treat local variables going out of scope as invalidating the corresponding address in memory. This diff fixes that by
- marking all local variables that exits the scope with the attribute `AddressOfStackVariable`
- before we write the summary for the proc, we make sure to invalidate all such addresses local to the procedure as `Invalid.` If such an address is read, then we would raise a use-after-lifetime issue.
Reviewed By: jvillard
Differential Revision: D16458355
fbshipit-source-id: 3686524cb
Summary: This implements incremental diff analysis by deleting only the summaries that need to be re-analyzed, keeping all summaries corresponding to procedures that have not been changed (or had a callee change).
Reviewed By: jvillard
Differential Revision: D16358474
fbshipit-source-id: 660a704a0
Scott Owens
Ezgi Çiçek
Sungkeun Cho
Nikos Gorogiannis
Martin Trojer
Phoebe Nichols
Artem Pianykh
Jules Villard
Timotej Kapus