Summary: Adding constraint `self > 0` after computing specs for Objective-C instance methods were causing false positives of the heuristics not to discard `self=0 /\ self|->-` (added new test testAnotherObjectUseSelfOk was FP). This diff adds constrain `self > 0` before computing Objective-C specs, discarding unsatisfiable `self > 0 /\ self =0`.
Reviewed By: skcho
Differential Revision: D29462462
fbshipit-source-id: 088ee447e
Summary: Useful to write other tests, and also probably worth modelling.
Reviewed By: ezgicicek
Differential Revision: D29232545
fbshipit-source-id: ecb24f6f7
Summary:
Investigations into the number of disjuncts we get in summaries
revealed that we sometimes blow past the limit. Rework the code to make
sure that does not happen.
We can probably raise the disjunct limit as a result, more experiments
needed.
Reviewed By: ezgicicek
Differential Revision: D29229249
fbshipit-source-id: 4a06594fa
Summary: Refactor Erlang expression translation. Previously expressions were translated to a list of instructions to be put in the single node. This will not work for expressions that require control flow (e.g., case, if). With this change, expressions are translated to blocks.
Reviewed By: skcho
Differential Revision: D29391068
fbshipit-source-id: 5f353e490
Summary:
Change the Makefile comment about how to enable shared library linking
despite llvm-config being broken into a rule.
Reviewed By: ngorogiannis
Differential Revision: D28907814
fbshipit-source-id: ac63d0104
Summary:
At least when installation of the conf-llvm package uses a non-system
llvm, additional compilation flags are needed. These can be queries by
asking opam for the location of the llvm-config binary, and asking
that for the compilation flags.
Reviewed By: ngorogiannis
Differential Revision: D28907810
fbshipit-source-id: 6806c78a8
Summary:
Generating the help file runs sledge, which refers to the
SLEDGE_CONFIG environment variable. This dependency was missing from
the build rule.
Reviewed By: ngorogiannis
Differential Revision: D28907804
fbshipit-source-id: e20178c6e
Summary:
Broken html could be generated if there were multiple status entries
for a single test.
Reviewed By: ngorogiannis
Differential Revision: D28907807
fbshipit-source-id: 5fcb30b5f
Summary:
It is possible for normalization to change a term from an
uninterpreted application to e.g. an interpreted atom. For instance,
the conversion `(u1)-1` evaluates to `1`. Context.canon_extend was not
taking this into account, and as a result could violate the
representation invariant of Context.t.
Reviewed By: ngorogiannis
Differential Revision: D28907806
fbshipit-source-id: 9b5171e15
Summary:
Allow joining relations with distinct entry states, since the
destinations will be the same, there is no loss of context
sensitivity. As a result, check that the call stack of the
destinations of edges are equal before joining, as it is no longer
implicitly ensured by the equal entry state check.
This change leads to joining a state with itself often, as the entry
states are often idential, so this diff also adds an optimization of
join with a fast path for joining identical states.
Reviewed By: ngorogiannis
Differential Revision: D28907809
fbshipit-source-id: 2c66223ff
Summary:
The control scheduler treats functions as if they were syntactically
inlined, by including a call stack in each control flow edge,
implicitly copying each function's control-flow graph for each calling
context. A "depth" is maintained for each retreating edge,
representing the number of times the edge has been crossed. The depths
are used to explore executions with fewer loop iterations before those
with more iterations.
The current implementation is incorrect in some situations involving
mutually recursive functions where the cycle detection algorithm
determines that calls to one of the mutually recursive functions need
not be considered retreating. Currently return frames of recursive
calls are filtered out of call stacks for the purposes of tracking
edge depths. This is insufficient in such mutual recursive
situations. This diff fixes this by explicity ignoring the entire
stack of recursive call edges.
Reviewed By: ngorogiannis
Differential Revision: D28907813
fbshipit-source-id: e04849ca8
Summary:
There are two changes:
1/ Fix incorrect merge of two cases (empty and not-empty)
```
let<*> astate_equal_zero = ... in
let<*> astate_not_zero = ... in
[Ok (ContinueProgram astate_equal_zero); Ok (ContinueProgram astate_not_zero)]
```
This was an incorrect merge, because if there is an error in the former
case `astate_equal_zero`, it doesn't even evaluate the latter case
`astate_not_zero`.
2/ Cover all cases precisely. There are actually three cases to cover:
* `TextUtils.is_empty(null) = true`
* `TextUtils.is_empty("") = true`
* `TextUtils.is_empty("abc") = false`
However, in the previous model, it missed the second case.
Reviewed By: jvillard
Differential Revision: D29393579
fbshipit-source-id: e59d9a60d
Summary:
This diff adds some semantic models for C++ string length. It introduces
an virtual field for string length and use the value in the models.
* basic_string constructor given a constant string
* string.empty
* string.length
Reviewed By: jvillard
Differential Revision: D29390815
fbshipit-source-id: 99d67e48e
Summary: Option is not used anywhere. More importantly the list of source file extensions in `Config` might give someone the impression the rest of Infer cares about it somehow.
Reviewed By: skcho
Differential Revision: D29361222
fbshipit-source-id: 22f7f66b2
Summary: Narrow container read/write modelled methods by requiring they are all non-static.
Reviewed By: ezgicicek
Differential Revision: D29331533
fbshipit-source-id: e0e445573
Summary:
After activation, a few bugs manifested and are fixed in this commit:
1. Create an (empty) Tenv per file. Previously, each file said there
will be a global Tenv, but no such global Tenv was ever saved. (There is
no static typing at all at the moment in the Erlang frontend.)
2. Procedures are now marked as defined. If the is_defined attribute is
false, then the analysis will not run even if the flowgraph in Procdesc
is nontrivial.
3. Non-dummy Start/Exit nodes for Procdesc. When a Procdesc is created,
it gets dummy Start/Exit nodes. These dummy nodes have a dummy location,
which causes debug output to have wrong directories/links.
4. Filenames from Erlang function names. By default, the verbose
procedure name was used to make file names for the debug output. But,
Erlang function names contain '/', which doesn't play well with
filenames. That's now replaced by '#' for the purposes of constructing
filenames.
Reviewed By: jvillard
Differential Revision: D29166049
fbshipit-source-id: 48346a05b
Summary:
Generates Sil instructions for Erlang some expressions:
- empty list: e.g. []
- cons: e.g. [1,2]
- atom literals: e.g. ok
- string literals: e.g. "foo"
- calls to particular (no higher-order), unqualified functions
Differential Revision: D28996467
fbshipit-source-id: fc7f7e3e9
Summary: Associations in map patterns should only be exact (`:=`). We did not validate this previously (D28832961 (65884018dc)), because we didn't have certain AST transformation passes that would eliminate some special functions that allowed invalid association kinds (later removed by transformation). However, with D29103633 (25711189a8), we get the AST from a different source and these invalid cases are removed, so the check is added.
Reviewed By: mmarescotti
Differential Revision: D29162325
fbshipit-source-id: a47d9f05d
Summary: This workflow still uses the parse transform hook to detect which files are compiled. The parse transform now adds an entry to a list of compiled BEAMs that will be traversed after compilation by the new `extract.escript` to produce the JSON ASTs in the provided outdir.
Differential Revision: D29103633
fbshipit-source-id: 12b8720f4
Summary: There was a typo (probably copy paste) in an error message for unknown unary operators in the Erlang frontend.
Differential Revision: D29062028
fbshipit-source-id: b79e783ba
Summary:
The formatting of sugared list syntax regressed with
https://github.com/ocaml-ppx/ocamlformat/pull/1567.
Reviewed By: ngorogiannis
Differential Revision: D28907812
fbshipit-source-id: 16ad68218
Summary: The llvm code to avoid formatting is now under `vendor` not `llvm`.
Reviewed By: da319
Differential Revision: D28907808
fbshipit-source-id: ae9444f49
Summary:
Implement validator for Erlang AST to check various invariants and well-formedness constraints (based on https://erlang.org/doc/apps/erts/absform.html), including:
- Restrictions on expressions used as patterns
- Restrictions on expressions used as guards
- Case and catch clauses have 1 pattern
- If clause has no patterns
See comments for some limitations:
- Some constraints would require type information (e.g., unary/binary operators in patterns/guards), we are not enforcing these yet.
- Map patterns can only have `:=` association, except in some special functions that get translated during compilation. However, we get the AST before these transformation so we are not enforcing this rule yet.
Reviewed By: rgrig
Differential Revision: D28832961
fbshipit-source-id: 7df4425e4
Summary:
{F623534971}
instead, we want the procedure name/type to be stylized as code
Reviewed By: skcho
Differential Revision: D29027480
fbshipit-source-id: 35f8e0c4a
Summary:
Patterns like X, [], [H | T], [X, Y | T] should now be translated.
Also, environment now stores Location.t rather than SourceFile.t: this
simplifies tracking locations during translation.
Reviewed By: skcho
Differential Revision: D28873581
fbshipit-source-id: 09171f9bf
Summary: The `Utils` module has another version of try-finally than can swallow exceptions from the restart scheduler. This diff fixes that, but has to also fix the dependency cycle introduced between `SymOp` and `Utils`. This is done by extracting the exception handling from `SymOp` into a new base module `Exception`.
Reviewed By: jvillard
Differential Revision: D28930082
fbshipit-source-id: 7894d8c89
Summary:
We were defaulting to treating some values as strings regardless of
their intended types. In particular, for options that take no arguments
this was making it impossible to specify them in .inferconfig. Now they
take "null" as argument.
Reviewed By: ezgicicek
Differential Revision: D28959484
fbshipit-source-id: 46327f3d3
Summary:
Bumps [ws](https://github.com/websockets/ws) from 6.2.1 to 6.2.2.
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Pull Request resolved: https://github.com/facebook/infer/pull/1451
Reviewed By: skcho
Differential Revision: D28929739
Pulled By: jvillard
fbshipit-source-id: b0bcd031c
Summary: Adapted the AST to reflect the official [documentation](https://erlang.org/doc/apps/erts/absform.html): a clause can have a *guard sequence*, which is a list of *guards*. Each *guard* is a list of *guard tests*. A *guard test* is a (restricted) expression. Therefore, in the AST we now have `guard_test = expression`, and a clause has `guard_test list list`. Furthermore, the JSON translator simply applies `to_expression` to the 2D list, instead of flattening one level with `andalso`. Using `andalso` to flatten was wrong because it handles exceptions differently, see [note](https://learnyousomeerlang.com/syntax-in-functions#guards-guards).
Reviewed By: rgrig
Differential Revision: D28936558
fbshipit-source-id: 510930998
Daiva Naudziuniene
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