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
Summary: Incremental analysis relies on analysis results in the results directory, so don't delete this directory if `--incremental-analysis` is used
Reviewed By: jvillard
Differential Revision: D16458113
fbshipit-source-id: bf7c63cb3
Summary:
The same logic for reading the env var and defaulting to the local
results dir was duplicated in a bunch of places.
Reviewed By: artempyanykh
Differential Revision: D16458976
fbshipit-source-id: 41f1a4f9c
Summary:
There was a little bit of code duplication around `analyze_proc` to deal with
the fact that we may be starting from either a proc name or a proc desc. Create
a new `callee` type that represents this more explicitly. This allows not
loading the `proc_desc` eagerly when we don't need it, although that doesn't
seem to impact perf measurably.
Reviewed By: ezgicicek
Differential Revision: D16442221
fbshipit-source-id: 8e8ebbd6b
Summary:
TL;DR: Until this patch, if you ran infer on MacOS Mojave you most
likely would get an error related to missing header files. Now infer
tries to automatically locate current MacOS SDK path thus providing a
better experience for first time users.
Consider helloworld.c
```
#include <stdio.h>
int main()
{
return 0;
}
```
Invoking the analysis `infer -- cc -c helloworld.c` fails with
facebook-clang-plugins/.../include/c++/v1/stdio.h:108:15: fatal error: 'stdio.h' file not found
The reason for this is twofold:
1. infer uses its own clang, not Apple's one (thus custom paths are
not properly setup).
2. Apple stopped copying standard headers from SDK to /usr/include.
Reviewed By: jvillard
Differential Revision: D16377866
fbshipit-source-id: c336ad64f
Summary: This test wasn't building correctly or being called by the toplevel makefile
Reviewed By: jvillard
Differential Revision: D16458386
fbshipit-source-id: 48a0c2f36
Summary:
:
In previous commits we introduced deriving capabilities in Backend stats.
Now we can rewrite the code so that usage of all fields is enforced at compile time.
Reviewed By: jvillard
Differential Revision: D16458130
fbshipit-source-id: aef751440
Summary:
As discussed in D16358474, the options `--reanalyze` and `--incremental-analysis` are not compatible
This diff warns about the compatibility problem in the documentation
Reviewed By: jvillard
Differential Revision: D16440482
fbshipit-source-id: ab841ace6
Summary:
Minor improvements to a bunch of stuff
- mostly, always log backend stats and time spent analysing, regardless of `-j 1`
- output stats more like they appear in the record
- split `InferAnalyze.main` to be more readable (hopefully)
Reviewed By: mityal
Differential Revision: D16440586
fbshipit-source-id: 6f91f53cd
Summary:
It's a bit more annoying to `incr` but is more uniform with the other
`mutable` field.
Reviewed By: ngorogiannis
Differential Revision: D16359027
fbshipit-source-id: 817cd94a0
Summary:
Modify the scheduler to collect results from children at the end of the
parallel execution. Use this to collect backend stats and log their
aggregated sum.
Reviewed By: ezgicicek
Differential Revision: D16358867
fbshipit-source-id: 775792ef7
Summary:
Use it to trace summary stats. It will be used more/better in future
diffs that aggregates stats across parallel workers.
Reviewed By: ezgicicek
Differential Revision: D16358868
fbshipit-source-id: 764614153
Summary:
Summary.ml defines both a bunch of types and how to use them and a
mechanism to save and store summaries on disk while maintaining a
complex in-memory cache of what's on disk. Make the distinction clear.
Reviewed By: ngorogiannis
Differential Revision: D16358869
fbshipit-source-id: 9d4c6cb77
Summary:
It downgrades issues of void pointer to L5, because of its impreciseness. This is not
ideal but Inferbo cannot analyze arrays pointed by void pointers precisely at the moment.
Reviewed By: jvillard
Differential Revision: D16379911
fbshipit-source-id: f2c016aba
Summary:
Fixes#1126
Different checks contain some ad hoc places that look at this param, but there is no systematic way to suppress this.
The centralized place that is filtering results is `reporting.ml`.
Note that this diff does not remove other usages, because they do more than mere filtering results.
Reviewed By: jvillard
Differential Revision: D16339655
fbshipit-source-id: afabdc97a
Summary:
The analysis call graph is the call graph from the perspective of the analyses run in infer
This commit creates the reverse analysis call graph to be used for incremental diff analysis
Reviewed By: ezgicicek
Differential Revision: D16335938
fbshipit-source-id: 0cbab3298
Summary: The reverse call graph will be constructed by adding edges one-by-one, so expose functionality in CallGraph to add a single edge to the graph
Reviewed By: jvillard
Differential Revision: D16285016
fbshipit-source-id: 553fe1ecf
Summary:
Add a function to delete a summary from disk and caches
This is needed so that summaries corresponding to invalidated procedures can be removed (as part of incremental diff analysis)
Reviewed By: ngorogiannis
Differential Revision: D16332752
fbshipit-source-id: 7d3c7a121
Summary:
`__llair_alloc` is meant to be a drop-in non-failing replacement for
`mallco`. Currently `__llair_alloc(1)` allocates 8 bytes instead of 1 as
`malloc(1)` would. This is because handling of `__llair_alloc` was
merged with handling of `new`. This patch reverts changes to handling of
`new` in D15778817 and adds a new case for `__llair_alloc`.
Reviewed By: jvillard
Differential Revision: D16356865
fbshipit-source-id: 3878d87c3
Summary:
The genrule-capture integration with Java relies on a buck config flag `infer.infer_bin=<path to infer>` (see test changes in `DEFS` below).
In a CI environment where the infer binary is checked out under a random directory, this means that the buck genrule is keyed by a random string (the path to infer), and this defeats caching.
Switch to the following contract: the genrule target does not expect a config flag at all. Instead it runs whichever `infer` binary is in the path. To make sure the binary is the same one with the originator, the capture integration runs buck under a modified `PATH` where the originator `infer` is sure to be the first matching entry.
NB cache invalidation is still OK because we rely on `infer.version` buck config flag, which will be hashed into the rulekey.
Reviewed By: jvillard
Differential Revision: D16332696
fbshipit-source-id: 2975d5c26
Summary:
When using summaries we first garbage collect the precondition and then
ask the solver to infer the frame of the precondition with respect to
grabage-collected footprint.
Currently if the solver fails to show the frame, we just give it an
empty frame. This is bad, because if grabage collection removed some
segments, they don't get added back on.
This patch throws an exception instead to be very explicit when the
solver cannot show the frame in this case.
Reviewed By: ngorogiannis
Differential Revision: D16339587
fbshipit-source-id: b88d0689c
Summary: The method defined in the interface didn't match the implementation. Caught by ulyssesr.
Differential Revision: D16339179
fbshipit-source-id: 9cbb1dc74
Summary:
The actual implementation of folly::usingJEMalloc() tests if malloc is
jemalloc using internal knowledge of the jemalloc implemenation of
malloc. This internal behavior is not reflected in the analyzer's
spec, so the detection fails.
Additionally, folly::usingJEMalloc is implemented using mallctl to
query internal state of jemalloc. Depending on the key string passed
to mallctl, it might return a pointer to jemalloc internal state, or a
scalar, which means that the spec needs to essentially allocate that
state in those cases.
Since the jemalloc detection fails, and the analyzer is not always
able to reason precisely about string equality, this diff models
folly::usingJEMalloc directly (as nondet).
Reviewed By: kren1
Differential Revision: D16059776
fbshipit-source-id: 7e7156d7d
Summary:
It seems that functions internalized by llvm no longer have valid
mangled names, and instead have a `.<int>` suffix. This diff removes
these unpredictable suffixes when checking if a called function is a
specified/modeled intrinsic.
Reviewed By: kren1
Differential Revision: D16059781
fbshipit-source-id: a4b9f6c73
Summary:
Write a function to read in the summaries from the `.specs` folder
This is needed so the reverse analysis call graph can be constructed from the summaries
Reviewed By: ngorogiannis
Differential Revision: D16282333
fbshipit-source-id: 101ce2c5b
Summary:
This javalib release gives compatibility with java 9 modules.
It should also remove some Infer warnings (when a class has no superclass)
JFile.sep is now a char
Reviewed By: jvillard
Differential Revision: D16220583
fbshipit-source-id: 5d05afde0
Summary:
When a file is passed to infer through `--changed-files-index` which is
- an absolute path
- the file does not exist
Then the code fails throwing an exception in the function below while trying to relativise the absolute path.
The behaviour on relative paths is to skip missing files, and does not fail because Infer does not attempt to relativise them.
Swallow the exception and skip the file; and so unify the behaviour across relative and absolute paths.
Reviewed By: mityal
Differential Revision: D16279672
fbshipit-source-id: 33b468da7
Summary:
Move the logic that is general to any call graph from SyntacticCallGraph.ml into CallGraph.ml
This will allow the call graph logic to be re-used in a later diff
Reviewed By: ezgicicek
Differential Revision: D16265150
fbshipit-source-id: 10a067f28
Summary:
This sometimes fail in our CI, eg:
```
[*ERROR**][66148] file has vanished: "/data/sandcastle/boxes/trunk-git-infer/infer/tests/build_systems/utf8_in_pwd/../codetoanalyze/make/utf8_in_function_names-617be4bc.o.tmp"
```
The issue seems to be that we are too greedy and try and copy files that may
disappear. This diff makes the list of files to copy over explicit to exclude
such temporary files.
Reviewed By: artempyanykh
Differential Revision: D16261872
fbshipit-source-id: 2b080d27a
Summary:
A frame inference query `Minuend ⊢ ∃xs. Subtrahend` returns a
`∃zs. Remainder` formula such that `Minuend ⊢ ∃xs. Subtrahend *
∃zs. Remainder` when successful. Currently if the subtrahend is itself
existentially quantified, its existentials are treated trivially: they
must witness themselves. This diff allows the solver to find witnesses
as the `xs`. They are still existentially quantified in the remainder,
so clients that need to constrain them should still name them before
calling the solver.
Reviewed By: kren1
Differential Revision: D16269630
fbshipit-source-id: 65136edd1
Summary:
Add a global merge pass that merges globals into a single big global. It
replaces the uses of globals merged, with offsets into the big global.
Function summarisationis a big benefactor of this as it greatly reduces
the number of implicit formals (ie. globals).
Reviewed By: jvillard
Differential Revision: D16260098
fbshipit-source-id: 1b936f02f
Summary:
Add a flag to enable incremental diff analysis, where old summaries are not recomputed unless necessary
The implementation for this flag will follow
Reviewed By: ngorogiannis
Differential Revision: D16222865
fbshipit-source-id: e7e225a87
Sungkeun Cho
Jules Villard
Phoebe Nichols
Timotej Kapus
Ezgi Çiçek
Artem Pianykh
Mitya Lyubarskiy
David Pichardie
Nikos Gorogiannis
Josh Berdine