Summary:
Represent And and Or formulas as pairs of sets of formulas. One set is
interpreted as positive and the other as negative. This results in
normalization with respect to associativity, commutativity, and unit
laws. This does not normalize distributivity laws, e.g. formulas are
not expanded to disjunctive-normal form or conjunctive-normal
form. Additionally, "zero" laws P ∧ ¬P iff ⊥ and P ∨ ¬P iff ⊤ are
cheaply detected and normalized. Note that formulas are already in
negation-normal form.
Reviewed By: jvillard
Differential Revision: D24306072
fbshipit-source-id: e52265a44
Summary:
Some Iter and Containers functions take optional arguments that
default to polymorphic comparison. This diff wraps all of these making
the argument non-optional to avoid silently using polymorphic compare.
Reviewed By: ngorogiannis
Differential Revision: D24306074
fbshipit-source-id: 34772ee86
Summary:
Expressing the sort of short-circuit evaluation in the changed code is
conceptually more direct using iterators.
Also, when using With_return, getting usable backtraces relies on the
compiler recognizing that the `raise` in the implementation of
`Base.Exn.raise_without_backtrace` should be a `reraise`. Using
iterators avoids this potential fragility.
Reviewed By: jvillard
Differential Revision: D24306094
fbshipit-source-id: b1abe04fb
Summary:
Change implementation of IArray from a wrapper of
Core_kernel.Array.Permissioned to NS.Array, and remove magic. Also
add operations to Array and Iter in order to ensure that IArray is an
extremely thin wrapper of Array: only defining conversions to/from
arrays as well as adding hashing support.
Reviewed By: jvillard
Differential Revision: D24306095
fbshipit-source-id: 97b9187be
Summary:
Term.const_of is misleading as it is easy to expect it checks if a
term is a constant, or to expect that it returns the constant part of
a term. Instead, Term.split_const is clearer:
```
val split_const : t -> t * Q.t
(** Splits a term into the sum of its constant and non-constant parts.
That is, [split_const a] is [(b, c)] such that [a = b + c] and the
absolute value of [c] is maximal. *)
```
Reviewed By: ngorogiannis
Differential Revision: D24306065
fbshipit-source-id: ba15958ad
Summary:
The treatment of comparison and exceptions in Core/Core_kernel/Base
makes them questionable as the default. This diff changes nonstdlib so
that Core is no longer opened in the global namespace, and makes a few
changes to handle the resulting minor API changes. This leads to a
lighter-touch nonstdlib, which makes a few definitions of its own, and
selects and extends modules from several libraries, including base,
core_kernel, containers, iter.
Reviewed By: jvillard
Differential Revision: D24306090
fbshipit-source-id: 42c91bd1b
Summary: Now elapsed time and the info in Unix.process_times is treated uniformly.
Reviewed By: jvillard
Differential Revision: D24306049
fbshipit-source-id: 09ab734ea
Summary:
The unary comparison to zero predicates are confusing to read since
whether the 0 is the left or right argument of the naturally infix
comparison is ambiguous. So replace Gt0 with Pos, meaning the argument
is positive, and remove the rest.
Reviewed By: jvillard
Differential Revision: D24306067
fbshipit-source-id: 2bd30dbe4
Summary:
Checking whether a formula is negative now only needs to inspect the
principle connective.
Reviewed By: ngorogiannis
Differential Revision: D24306061
fbshipit-source-id: 1f110e7f1
Summary:
Add a negation formula that will be used on atomic formulas instead of
ensuring the set of literals is closed under negation. This is in
preparation for more efficient negation and negation-normal form
preservation, which explicitly tracks whether literals are positive or
negative.
Reviewed By: ngorogiannis
Differential Revision: D24306055
fbshipit-source-id: 9300d6aee
Summary:
Change the representation of Fol terms to use polynomials for
arithmetic. This is a generalization and simplification of those used
in Ses. In particular, the treatment of division is stronger as it
captures associativity, commutativity, and unit laws, plus being the
inverse of multiplication.
Also, the interface is staged and factored so that the implementation
of polynomials and arithmetic is separate from the rest of terms.
Reviewed By: jvillard
Differential Revision: D24306108
fbshipit-source-id: 78589a8ec
Summary:
Function symbols when applied to literal values can be simplified by
evaluating them. This can be done even for function symbols that are
otherwise uninterpreted. This is not very strong, but is important in
some cases, and can prevent accumulating large complex terms that are
equal to literal constants.
Reviewed By: jvillard
Differential Revision: D24306044
fbshipit-source-id: 8c34d1ef2
Summary: In preparation for generalizing the type of multiplicities.
Reviewed By: jvillard
Differential Revision: D24306052
fbshipit-source-id: ddb71499e
Summary:
The form of the Base containers interface, in particular the way
comparison functions are passed using Comparators, is slower than
standard functors. Also Base.Map is missing some operations, such as
efficient merge and union.
Reviewed By: jvillard
Differential Revision: D24306047
fbshipit-source-id: e1623b693
Summary:
The form of the Base containers interface, in particular the way
comparison functions are passed using Comparators, is slower than
standard functors.
Reviewed By: jvillard
Differential Revision: D24306082
fbshipit-source-id: abf3e0293
Summary: Hopefully only transitional until Fol.Var and Ses.Var are conflated.
Reviewed By: jvillard
Differential Revision: D24306039
fbshipit-source-id: 5c3be8d4d
Summary:
Clarify the translation of 1-bit integer operations to formulas, and
add a few missing cases.
Reviewed By: ngorogiannis
Differential Revision: D24306057
fbshipit-source-id: 626a27997
Summary:
The translation from Llair to Fol can now be implemented using only
the external interface of Fol, so move it to a separate module. This
makes Fol not depend on Llair and vice versa, as appropriate.
Reviewed By: jvillard
Differential Revision: D24306087
fbshipit-source-id: fc68a588b
Summary:
Instead of relying on tuple terms, make function symbol applications
and predicate symbol literals n-ary directly.
Reviewed By: jvillard
Differential Revision: D24306078
fbshipit-source-id: 2863dceb4
Summary:
Move the punting between arrays and lists out of the clients of the
n-ary application normalizing constructors.
Reviewed By: jvillard
Differential Revision: D24306071
fbshipit-source-id: f3d2cb5df
Summary:
References from a record to one of its ancestor records are used to
represent cyclic or recursive record values. While the current
interpretation is weak, these logically are part of the record theory
and should be interpreted with the rest of the record terms.
Reviewed By: jvillard
Differential Revision: D24306091
fbshipit-source-id: 41553741d
Summary:
The empty record term is only used as the base of a sequence of
updates for an interval of indices from 0 to some N. A more direct
representation is to combine such sequences of updates into a flat
record term listing the elements.
Reviewed By: jvillard
Differential Revision: D24306048
fbshipit-source-id: d1b4900c8
Summary:
The uses of record terms only require indices that are literal
integers. This is a significant logical simplification from the
perspective of the backend solver.
Reviewed By: jvillard
Differential Revision: D24306093
fbshipit-source-id: 083dcc6b5
Summary:
Conversions between types are uninterpreted, so use uninterpreted
function symbols for them.
Reviewed By: jvillard
Differential Revision: D24306077
fbshipit-source-id: 49937fdbb
Summary:
Label values are uninterpreted, so use an uninterpreted function
symbol for them.
Reviewed By: jvillard
Differential Revision: D24306097
fbshipit-source-id: e139c70ba
Summary:
Floating point values are uninterpreted, so use an uninterpreted
function symbol for them.
Reviewed By: jvillard
Differential Revision: D24306096
fbshipit-source-id: 8c10dd3fd
Summary:
Convert from Llair.Exp to Fol.Term directly instead of going via
Ses.Term. This is a step on the way to removing Ses.
There are currently some term simplifications done in Ses.Term that
are missing in Fol.Term. This means that converting directly from
Llair.Exp to Fol.Term instead of via Ses.Term is not exactly the same
as the indirect conversion. The missing simplifications will be added
to Fol.Term in upcoming diffs.
Reviewed By: jvillard
Differential Revision: D24306053
fbshipit-source-id: 4ec5620a9
Summary:
Code is expressed using Llair.Exp, which is potentially higher
fidelity than Term. So define the interval analysis directly in terms
of the Llair form.
Reviewed By: jvillard
Differential Revision: D24306085
fbshipit-source-id: f9d876eec
Summary:
Generalize Fol.Predsym to separate Predsym module for arbitrary
uninterpreted predicate symbols.
Add uninterpreted predicate literals to Ses.Term.
Use uninterpreted predicates to represent "ord" and "uno".
Reviewed By: jvillard
Differential Revision: D24306105
fbshipit-source-id: bdd72a8be
Summary: Funsym does not need to be defined as a submodule of Fol.
Reviewed By: jvillard
Differential Revision: D24306092
fbshipit-source-id: 7875f45f0
Summary:
A number of function symbols are not interpreted. This diff adds
generic uninterpreted function symbols, which will be used later to
avoid treating different uninterpreted functions separately.
Reviewed By: jvillard
Differential Revision: D24306076
fbshipit-source-id: b70ed10aa
Summary:
With the implementation of variables defined parametrically over their
representation, the implementation can also be used for Fol.Var.
Reviewed By: ngorogiannis
Differential Revision: D23703054
fbshipit-source-id: d27bdbbe8
Summary:
Variables are represented as a subtype of terms. The implementation of
the operations on variables is largely independent of this. This diff
generalizes the implementation over the concrete representation, and
moves it to a separate module.
Reviewed By: ngorogiannis
Differential Revision: D23660290
fbshipit-source-id: 90d8c3ca4
Summary:
Increase the fidelity of the status in the analysis report slightly by
including the number of analysis steps taken.
Reviewed By: jvillard
Differential Revision: D23648493
fbshipit-source-id: 8050b7829
Summary:
Just to avoid confusion over directories named 'bin' being expected to
contain binaries, rather than the sources of executables.
Reviewed By: jvillard
Differential Revision: D23636372
fbshipit-source-id: 8593380e6
Summary:
Add support to ppx_trace to rewrite `[%trace]` into a call to the
corresponding `Trace` function:
```lang=ocaml
val trace :
?call:(pf -> unit)
-> ?retn:(pf -> 'a -> unit)
-> ?rais:(pf -> exn -> Printexc.raw_backtrace -> unit)
-> string
-> string
-> (unit -> 'a)
-> 'a
(** [trace ~call ~retn ~rais mod_name fun_name k] either simply invokes
[k ()], when not enabled, or else increases the indentation level and
emits the [call] message, then invokes [k ()], then decreases the
indentation level and either emits the [retn] or [rais] message,
depending on whether [k ()] returned normally or exceptionally. *)
```
The main motivation over the existing `Trace.call` and `Trace.retn` is
that by packaging them together, unhandled exceptions can be treated
better.
Reviewed By: jvillard
Differential Revision: D23636200
fbshipit-source-id: f61c267fd
Summary:
Construct the identity function explicitly instead of relying on the
`Stdlib.Fun.id` name, which can be problematic depending on compiler
version and which modules have been `open`ed.
Reviewed By: jvillard
Differential Revision: D23636204
fbshipit-source-id: 2fb644c18
Summary:
Version 0.16 of ppxlib breaks merlin in combination with ppx_trace,
due to https://github.com/ocaml-ppx/ppxlib/issues/175.
Reviewed By: jvillard
Differential Revision: D23636202
fbshipit-source-id: 37a5f36b7
Summary:
The expansion of the `[%debug]` extension point is simple and fits
into the pattern supported by `Ppxlib.Extension`. This diff simplifies
the mapper implementing the rest of the trace expansion by moving the
expansion of debug into a separate
`Ppxlib.Context_free.Rule.extension` rule.
Reviewed By: jvillard
Differential Revision: D23636201
fbshipit-source-id: 847c258fd
Summary:
Use `Ppxlib.Ast_traverse.map` instead of
`Ppxlib.Selected_ast.Ast.Ast_mapper` which is included from
`Migrate_parsetree` since `Ppxlib.Selected_ast.Ast` reexports one of
the `Migrate_parsetree.Versions` modules. This change is needed to be
compatible with (ocaml-migrate-parsetree 2.0 and) ppxlib 0.16 since it
no longer re-exports the `Ast_mapper` module from
`Migrate_parsetree`. This ppxlib change is one of the headline
simplification enablers noted in the (announcement of
ocaml-migrate-parsetree
2.0)[https://discuss.ocaml.org/t/ocaml-migrate-parsetree-2-0-0/5991].
Reviewed By: jvillard
Differential Revision: D23636203
fbshipit-source-id: 71e24b46b
Summary:
When equal_or_separate returns Unknown, it is common to sort the args,
which is wasteful since computing equal_or_separate already had to
test if the args are equal, which is most if not all of the work of
comparing them.
Reviewed By: jvillard
Differential Revision: D23636205
fbshipit-source-id: 5b2bcdd8f
Summary:
The `sledge-help.txt` file is under source control, and should not be
removed by `make clean`.
Reviewed By: ngorogiannis
Differential Revision: D23497893
fbshipit-source-id: 2061160a8
Summary:
`Fol.equal_or_opposite p q` naively constructs the negation of `q` in
most cases, only to test if it is equal to `p`. This is an inefficient
method of computing if one formula is the negation of another. This
diff implements this directly. The drawback is some duplication of the
negation logic from `_Not`.
Reviewed By: ngorogiannis
Differential Revision: D23487500
fbshipit-source-id: 100f95edc
Summary:
Normalize conditional formulas to ensure that their "condition"
formula is not "negative". This avoids redundant formulas such as `(x
= 0 ? p : q)` and `(x ≠ 0 ? q : p)`. The choice of which formulas are
"negative" for this purpose is mostly arbitrary, with the only real
constraint being that negating a negative formula should produce a
positive one.
Note that conditional formulas themselves are considered to be
"positive" since negating them produces another conditional formula
with the same condition formula.
Reviewed By: ngorogiannis
Differential Revision: D23487502
fbshipit-source-id: 63606d89c
Summary:
Sort the subterms or subformulas of binary formulas that are
symmetric. This avoids redundant formulas such as both `x = y` and `y
= x`.
Reviewed By: ngorogiannis
Differential Revision: D23487501
fbshipit-source-id: 7e2295aba
Summary:
To support:
- html report generation via sexp reports (instead of RESULT in stdout)
- smt2 benchmarks
- local and extra-repo tests
- calculation of relative paths to tests
Reviewed By: ngorogiannis
Differential Revision: D23459514
fbshipit-source-id: f44e51c17
Summary:
Add a `sledge-report` executabe to aggregate and report results from
test runs. Results from possibly-many test runs are averaged and
reported in an html file with color-coded indications of performance
improvement or regression.
Reviewed By: ngorogiannis
Differential Revision: D23459521
fbshipit-source-id: 61ca936f4
Summary:
Add a Report.status type to represent the overall status of an
analysis run, and revise handling of backtraces to preserve the trace
of the originally-raised exception in more cases.
Reviewed By: ngorogiannis
Differential Revision: D23459518
fbshipit-source-id: a99fe0d14
Summary:
The SLEdge internal first-order theory solver targets the "word
problem", where a query has the form `C ⊢ L` where `C` is a
conjunction of literals and `L` is a single literal. This can be
abused to implement a naive SMT solver using an expansion to
disjunctive-normal form and checking `C ⊢ false` for each branch `C`
of the DNF. This is not useful as an SMT solver, but can be used for
testing.
Reviewed By: ngorogiannis
Differential Revision: D23459524
fbshipit-source-id: 5483e5a84
Summary: Formula.disjuncts was a quickly written approximation of DNF.
Reviewed By: ngorogiannis
Differential Revision: D23459513
fbshipit-source-id: 79fd60a7b
Summary:
It was incorrect in case any but the first of of the Formula.disjuncts
was inconsistent.
Reviewed By: ngorogiannis
Differential Revision: D23459519
fbshipit-source-id: 394677e38
Summary:
The only use of the ill-specified Sh.with_pure function is to ignore
the pure part when computing free variables. So add an argument to
Sh.fv to achieve that explicitly and remove Sh.with_pure.
Reviewed By: ngorogiannis
Differential Revision: D23459517
fbshipit-source-id: 8767799ca
Josh Berdine