Summary:
The current notion of "simplified" function symbols, which are treated
as a hybrid between interpreted and uninterpreted, has no logical
basis. Normalization is now strong enough, due to stronger handling of
the changing carrier set, that the "simplified" classification can be
removed.
Reviewed By: jvillard
Differential Revision: D20726961
fbshipit-source-id: 9962ea323
Summary:
It is possible for the canonical form of a term in (the carrier set
of) a relation to be a term that is not in the relation. It is also
possible for this term to be equal to a term in the relation. It is
the job of the lookup subroutine of normalization to find these
equations.
The current implementation of entails_eq is incomplete in this case,
in particular, when an uninterpreted term has an interpreted subterm,
which itself has a subterm that is not a representative.
This diff strengthens normalization (and hence it's callers such as
entails_eq) to handle such cases. This makes lookup work slightly
harder. An alternative would be to extend the carrier with new terms
from normalization to the carrier and closing the relation, and then
re-normalizing. That would lead to much inflated representation sizes,
and is inefficient.
Reviewed By: jvillard
Differential Revision: D20612565
fbshipit-source-id: 3b7534a62
Summary:
This diff adds enough interpretation of Mul and Div terms to be able
to exclude them from the domain of solution substitutions. While
non-linear arithmetic is still treated very incompletely, this change
increases the propagation power of the equality constraints that are
deduced. Mainly, this appears to be enough to avoid operations that
are semantically equivalence-preserving such as solve_for_vars from
producing equalities that are unprovable from their inputs.
Reviewed By: jvillard
Differential Revision: D20863528
fbshipit-source-id: fca74cba3
Summary:
For non-linear polynomial equations, the solver can currently choose
to solve for a variable that occurs in a non-linear subterm, leading
to a non-idepotent solution substitution. For example, `x - y + (x ×
z) = 0` could be solved for `x`, leading to `x ↦ y - (x × z)` where
`x` is solved in terms of itself. This diff refines Term.solve_zero_eq
to avoid such cyclic solutions.
Reviewed By: jvillard
Differential Revision: D20637482
fbshipit-source-id: 6d7df85c3
Summary:
Strengthen the canonizer for division and rational constant terms. It
is important to avoid constructing `Q.t` values with 0 denominators,
as they do not represent real numbers, and the algebraic manipulation
done by the rest of the solver is incorrect in that case.
Additionally strengthen the Term representation invariants to check
that all coefficients and exponents are valid real rational numbers.
Also normalize division by an integer or rational to multiplication by
a rational.
Reviewed By: jvillard
Differential Revision: D20663964
fbshipit-source-id: 210962fe0
Summary:
Equations of the form `a = b` where `a` is a proper subterm of `b` are
possible when uninterpreted functions are involved. Internally,
Equality does not eagerly substitute `b` for `a`, but external clients
can repeatedly `Equality.normalize` terms and thereby incrementally
blow up the sizes of terms.
This diff uses the heights of uninterpreted terms to choose equality
class representatives to avoid such blow-ups, by orienting equations
so that tall terms are represented by short terms, so that repeated
normalization cannot increase term height indefinitely.
Reviewed By: jvillard
Differential Revision: D20785632
fbshipit-source-id: ff4c5bacd
Summary:
The types are constants and need not be re-checked for equality during
normalization, etc.
Reviewed By: jvillard
Differential Revision: D20863526
fbshipit-source-id: 1adde5ee0
Summary:
Ensure all entry points check the representation invariant before
returning, and strengthen it to check the constraints on preference
between representative terms, and to check that the relation is
closed.
Reviewed By: jvillard
Differential Revision: D20612566
fbshipit-source-id: b345397c4
Summary:
Change the implementation of `Equality.Subst.compose` to preserve
physical equality if the result is `Subst.equal` to the first
argument.
Reviewed By: jvillard
Differential Revision: D20752671
fbshipit-source-id: 4641a298a
Summary:
Currently there is an implicit assumption in Sh.simplify that
variables do not occur free in an equality relation which makes no
constraint on their values. This diff adds a step to formula
simplification that explicitly removes eliminated existentials from
equality relations.
Reviewed By: jvillard
Differential Revision: D20726960
fbshipit-source-id: 7109aa479
Summary:
Fix the crash in
```
(And_eq () (Var (id 10) (name v))
(Mul (((Var (id 8) (name v)) 1) ((Var (id 9) (name v)) 1)))
((xs ()) (sat true) (rep ())))
```
The solver for interpreted functions relies on the solution
substitutions containing mappings from variables to interpreted
applications, and never in the reverse. When solving equations
involving polynomials, this constraint is specifically
established. But for equalities involving only monomials, it could
happen that e.g. `x` was chosen as the representative of `a × b`,
which violates this constraint.
Reviewed By: jvillard
Differential Revision: D20596422
fbshipit-source-id: 69b026f03
Summary: Term.compare already ignores Var names, make Term.equal do so as well.
Reviewed By: jvillard
Differential Revision: D20663961
fbshipit-source-id: 59e7aa880
Summary:
Generate output on stderr containing lines such as:
```
solve_for_vars time: 0.105 ms 0.871 ms 79 calls
```
which indicates that the current maximal time of a single
`solve_for_vars` query is `0.105 ms` and so far the total time spent in
`solve_for_vars` over `79` queries is `0.871 ms`.
At program exit, there is also a line for each timer indicating the
max query time and final accumulated duration and number of queries:
```
solve_for_vars time: 0.173 ms 17.242 ms 1108 calls
```
Additionally, replay sexp are dumped interactively. A query exceeding
1 sec is dumped, then one exceeding 2 sec, then 4 sec, etc.
Reviewed By: jvillard
Differential Revision: D20852160
fbshipit-source-id: 0a316891e
Summary:
Rename and clarify documentation to indicate that the stronger
specification wrt physical equality is due to requiring the mapped
function to be an endofunction.
Reviewed By: jvillard
Differential Revision: D20863524
fbshipit-source-id: 74dabeb5c
Summary:
Otherwise there is an alias `'a t` for `'a option` polluting the
global namespace, which causes e.g. merlin to produce confusing types.
Reviewed By: jvillard
Differential Revision: D20831349
fbshipit-source-id: dff7b4f15
Summary: The flags `--biabduction-fallback-model-alloc-pattern` and `--biabduction-fallback-model-free-pattern` were unused because we removed the models from .inferconfig a while ago because of too many false positives. We are implementing a better memory leak check based on Pulse, and are adding the similar flags `--pulse-model-alloc-pattern` and `--pulse-model-free-pattern`.
Reviewed By: jvillard
Differential Revision: D21061511
fbshipit-source-id: 1b3476c22
Summary:
Instead of having to remember to update both the inferbo and the concrete
intervals domains of pulse, hide these details under a unified API. This
should help the transition to adding a third(!) numerical domain later
on (pudge!).
Reviewed By: ezgicicek
Differential Revision: D21022920
fbshipit-source-id: 783157464
Summary:
Now that the shape of the record type of AbductiveDomain.t is known, we
don't need this getter anymore. Keep `get_pre` and `get_post` as they
perform useful casting to `BaseDomain.t`.
Reviewed By: ezgicicek
Differential Revision: D21022924
fbshipit-source-id: 340f4edf8
Summary:
The "interface" modules define short forms for the internals of pulse
and also serve as a guide of which modules you are supposed to use at
which "level" in the pulse domains (base domain vs abductive domain vs
higher-level PulseOperations.ml). Make sure they are used.
Reviewed By: skcho
Differential Revision: D21022927
fbshipit-source-id: f890df245
Summary:
PulseAbductiveDomain.ml can be split into two distinct parts:
1. The definition of the "abductive domain" itself. This remains in that
file.
2. How to apply a given pre/post pair to the current state (during a
function call). This is about the same size as 1. in terms of lines
of code(!) and is now in PulseInterproc.ml.
Reviewed By: ezgicicek
Differential Revision: D21022921
fbshipit-source-id: 431fe061e
Summary:
I'm moving this code in the next diff and need this refactor. It should
be the same as before.
Reviewed By: ezgicicek
Differential Revision: D21022926
fbshipit-source-id: ebe644ef9
Summary:
See the code comment re: why don't we also recommend "strict" at this
stage. We can always change it later when we think users are happy with
strict.
Reviewed By: artempyanykh
Differential Revision: D21039553
fbshipit-source-id: 758ccf32c
Summary:
Having copypaste is painful to support. Lets make .mli the source of
truth.
Improved docs a bit, while I was here.
Reviewed By: artempyanykh
Differential Revision: D20948916
fbshipit-source-id: 1668dbc9c
Summary:
This diff is a step forward to the state when the list of type violations is
independent of the mode (and we use mode solely to decide re: whether to
report or not).
This fixes a case when we incorrectly defined possible promo mode (see
the test payload)
Reviewed By: artempyanykh
Differential Revision: D20948897
fbshipit-source-id: 616b96f96
Summary:
See the comments in the code why it makes logical sense.
This diff is a step forward the state when list of type violations is
independent of the mode (and we use mode solely to decide re: whether to
report or not).
This fixes majority of cases in ModePromotions.java
Reviewed By: artempyanykh
Differential Revision: D20948656
fbshipit-source-id: 82c0d530b
Summary:
Currently we exlude only if the method is based on deprecated config
packages.
Lets use the proper method, which covers both cases (config +
user-defined third party repo).
Reviewed By: artempyanykh
Differential Revision: D20946506
fbshipit-source-id: c3332667f
Summary:
Previously, we learned to detect if Default mode class can be made
Nullsafe(LOCAL).
Lets generalize it and calculate the precise mode.
NOTE 1: We don't distinct shades of "Trust some". We also don't
recommend trust some and recommend "Trust all" instead.
NOTE 2: As you can see from the test payload (see ModePromotions.java),
the precise calculation is not working as expected. This is due to a bug
in nullsafe implementation/design. See follow up diffs that will fix
this test.
Reviewed By: artempyanykh
Differential Revision: D20941345
fbshipit-source-id: 2255359ba
Josh Berdine
Dulma Churchill
David Pichardie
Daiva Naudziuniene
Mitya Lyubarskiy
Jules Villard