Summary: It moves the functions that constructs array values from BufferOverrunSemantics to ArrayBlk and Val modules.
Reviewed By: mbouaziz
Differential Revision: D9194130
fbshipit-source-id: bf040a01a
Summary:
It removes the sizeof function because most of the cases on static types are addressed in the clang frontend.
Depends on D9193802
Reviewed By: mbouaziz
Differential Revision: D9213876
fbshipit-source-id: 0ce2f3749
Summary: It uses a SymbolPath map to Symbol in Inferbo's summary instead of an entry memory of callee, which is used for instantiations of the abstract memories on function calls.
Reviewed By: mbouaziz
Differential Revision: D9081631
fbshipit-source-id: 478cda0de
Summary:
It adds relational domains to Inferbo: octagon of Apron and polyhedra of Elina.
- Each Mem domain value includes one relational value containing relations among symbols. The relational values are modified by the `Prune` and `Store` commands.
- Each abstract value includes three symbols, which represent integer value, array offset, and array size of an abstract value.
The relational domain is deactivated by default. Use the `--bo-relational-domain {oct, poly}` option for the activation, though Inferbo with the relational domains does not work at this point because some modifications of Apron and Elina we made has not been applied to their opam repositories yet.
Reviewed By: jvillard
Differential Revision: D8874102
fbshipit-source-id: 08e5883cb
Summary: `IntLit.to_int` could raise, was not documented until recently and was not named `_exn`. Switch to option type and fix uses.
Reviewed By: jeremydubreil
Differential Revision: D8865525
fbshipit-source-id: f5ec2f221
Summary:
It adds relational domains to Inferbo: octagon of Apron and polyhedra of Elina.
- Each `Mem` domain value includes one relational value containing relations among *symbols*. The relational values are modified by the `Prune` and `Store` commands.
- Each abstract value includes three *symbols*, which represent integer value, array offset, and array size of an abstract value.
The relational domain is deactivated by default, so this diff should not make any differences in CI.
Use `--bo-relational-domain {oct, poly}` for the activation, though Inferbo with the relational domains does not work at this point because some modifications of Apron and Elina we made has not been applied to their opam repositories yet.
Reviewed By: mbouaziz, jvillard
Differential Revision: D8478542
fbshipit-source-id: 510ff53
Summary:
The motivation is in a following diff: ensuring symbols do not cross procedure boundaries.
- This diff rewrites `Bound.subst` to be based on the substituted bound rather than folding on the symbol map.
- This way we are sure all symbols are substituted and no symbols from another procedure remains in the result.
- All cases from the previous version should still be here, I think I added a few constant approximations of minmax substituted with minmax (that would be return Top).
Side-effects (good):
- `mult_const` has also more constant approximations for minmax,
- substitution should be faster
Reviewed By: jvillard
Differential Revision: D8369993
fbshipit-source-id: 6ed8be8
Summary:
Having the `Node` module including in the `CFG` one is confusing.
Let's keep it separate.
Reviewed By: ngorogiannis
Differential Revision: D8185754
fbshipit-source-id: 62077e6
Summary:
Change the license of the source code from BSD + PATENTS to MIT.
Change `checkCopyright` to reflect the new license and learn some new file
types.
Generated with:
```
git grep BSD | xargs -n 1 ./scripts/checkCopyright -i
```
Reviewed By: jeremydubreil, mbouaziz, jberdine
Differential Revision: D8071249
fbshipit-source-id: 97ca23a
Summary:
For now: just moving this list behind an abstract type.
Next: changing the internal representation.
Reviewed By: ngorogiannis
Differential Revision: D8140926
fbshipit-source-id: 5b959b0
Summary:
We never really need the list of nodes/succs/preds, we only need to fold over them.
This will reduce garbage for computed lists like in the Exceptional CFG or the OneInstrPerNode CFG.
Reviewed By: ngorogiannis
Differential Revision: D8185665
fbshipit-source-id: d042beb
Summary:
It improves the precision of widening operations of interval:
upper_bound_widen (min(n, s), s) = s
lower_bound_widen (max(n, s), s) = s
Reviewed By: mbouaziz
Differential Revision: D8038941
fbshipit-source-id: 61b10cb
Summary:
Preparing for bigger changes...
- Rename `payload` field to `payloads`
- Move `payload` type to `Payloads.t`
- `SummaryPayload`s only have to implement a change on `Payloads.t` rather than `Summary.t`
Reviewed By: sblackshear
Differential Revision: D7987211
fbshipit-source-id: c9d7a74
Summary:
Before we were computing the size of an abstract state (`range`) using the `NonNegativeBound` domain but it wasn't able to express product of symbolic values.
This diff introduces a domain for that.
The range of an interval is still computed in `NonNegativeBound` but then the product is done in `TopLiftedPolynomial` so all costs end up being of that type.
The //symbols// of a polynomial are `NonNegativeBound` (so the polynomial only represent non-negative values, perfect for a cost), which handles substitution correctly, i.e. it gives zero instead of negative values.
Reviewed By: ddino
Differential Revision: D7397229
fbshipit-source-id: 6868bb7
Summary:
Java arrays have an internal length that can be retrieved with the internal `__get_array_length`.
Here is a model for it.
Reviewed By: jvillard
Differential Revision: D7931572
fbshipit-source-id: fd4c179
Summary:
Attempt at a better naming scheme:
- `Specs.summary` are now `Summary.t`. The `Summary` module (replacing `Specs`) contains the summary of a procedure: the results of all the analyses, etc.
- `Summary.ml` is now `SummaryPayload.ml`. This concerns how each (AI) analysis extracts its payload from the master summary.
- Accordingly, checkers now define a `Payload` module where previously they defined a `Summary` module. The type is also cleaned up to use `t` instead of `payload`, etc.
- Cleaned up some names as a result, for instance `Specs.get_summary` -> `Summary.get`, etc.
Reviewed By: ngorogiannis
Differential Revision: D7935883
fbshipit-source-id: 1766545
Summary:
This is an attempt to make things more consistent, and maybe save some work
from the `Format` module in case flambda doesn't have our backs.
Reviewed By: jberdine
Differential Revision: D7775496
fbshipit-source-id: 59a6314
Summary:
The Cost analysis uses `Bound` for non-negative values only, let's make it a separate module (and abstract type).
This also separates the abstract domain part of `Bound` which we wanted anyway.
Depends on D7844267
Depends on D7843351
Depends on D7782184
Reviewed By: ddino
Differential Revision: D7844572
fbshipit-source-id: 0e6b620
Summary: We were wrongly using the underapproximation of `min` rather than the overapproximation
Reviewed By: ddino
Differential Revision: D7844267
fbshipit-source-id: c9d9247
Summary:
This simplifies the frontends and backends in most cases. Before this diff,
returning `void` could be modelled either with a `None` return, or a dummy
return variable with type `Tvoid`. Now it's always the latter.
Reviewed By: sblackshear, dulmarod
Differential Revision: D7832938
fbshipit-source-id: 0a403d1
Summary:
Add warning 60 (unused module) to the list of fatal warnings. Whitelisting
modules at toplevel is tricky (see inline comments) but doable.
Reviewed By: mbouaziz
Differential Revision: D7790073
fbshipit-source-id: 6f591c4
Summary:
Now that we have the abstract state at the instruction level, we don't need to reexecute instructions during the checking phase and can just query the invariant map.
Depends on D7608526
Reviewed By: skcho
Differential Revision: D7775889
fbshipit-source-id: be17e2d
Summary:
Upgrade ocamlformat, and base which needs to be done in sync in order to build
ocamlformat, and the other deps can come for the ride.
Reviewed By: jvillard
Differential Revision: D7663537
fbshipit-source-id: 3e90970
Summary:
Now that everything can run at the same time and we have preanalyses, it can be quite hard to read debug sessions.
Here come session names!
Depends on D7607336
Reviewed By: sblackshear
Differential Revision: D7607481
fbshipit-source-id: 676af86
Summary:
So we can share stuff between analyses using the same CFG and node representation.
Depends on D7586302
Depends on D7586348
Depends on D7568701
Reviewed By: sblackshear
Differential Revision: D7586645
fbshipit-source-id: ed64b2c
Summary: This will facilitate accessing Inferbo abstract state at the instruction level from the Cost analysis
Reviewed By: ddino
Differential Revision: D7568701
fbshipit-source-id: 84ac648
Summary:
Got rid of `Itv.equal` which was ambiguous and use an abstract boolean type for abstract comparison results
Depends on D7568573
Reviewed By: jvillard
Differential Revision: D7568583
fbshipit-source-id: 0e897e9
Summary:
Convenience function for `prune_eq` with zero (needed for stacked diffs).
Renamed `prune_zero` to `prune_ne_zero` to avoid ambiguity.
Reviewed By: jvillard
Differential Revision: D7568556
fbshipit-source-id: b95ab6d
Summary:
This information is already available in the trace, and can contain absolute
paths to system includes (or infer's own clang runtime), which confuses the
diff analysis.
Reviewed By: mbouaziz
Differential Revision: D7534609
fbshipit-source-id: 5bd8f8b
Summary:
It renames `eval_locs` to `eval_arr` and we use it for getting array block values the given input expressions are pointing to. For example, when given a program variable `x` as an input, `eval_arr` returns array blocks that `x` is pointing to, on the other hand, `eval` returns an abstract location of `x`.
Depends on D7471891
Reviewed By: mbouaziz
Differential Revision: D7471915
fbshipit-source-id: b994944
Summary: In the pointer arithmetics, it returns top, if we cannot precisely follow the physical memory model, e.g., (&x + 1).
Reviewed By: mbouaziz
Differential Revision: D7453510
fbshipit-source-id: db8738e
Summary:
`Bottom` is only useful for unreachable code detection, which is already handled.
Let's not check `Bottom` states.
Depends on D7289084
Reviewed By: skcho
Differential Revision: D7289153
fbshipit-source-id: 8333ce7
Summary: It adds an issue type, `BUFFER_OVERRUN_U5`, for alarms involving unknown values, i.e., when the trace set includes an unknown function call.
Reviewed By: mbouaziz
Differential Revision: D7178841
fbshipit-source-id: bfe857b
Mehdi Bouaziz
Sungkeun Cho
Martino Luca
Julian Sutherland
Ezgi Çiçek
Nikos Gorogiannis
Jules Villard
Josh Berdine
Dino Distefano