Summary:
In order to avoid FPs due to lack of relational info, we apply a heuristic: proof obligations has a latest pruned values,
then it is instantiated at Call statements. If there is a bottom value in the instantiated pruned values, we can say the
program point where the proof obligation is introduced is unreachable with the given parameters of the function.
Depends on D13414441
Reviewed By: mbouaziz
Differential Revision: D13414483
fbshipit-source-id: 61bd34ebb
Summary: It weakly updates array when there are more than two contents.
Reviewed By: mbouaziz
Differential Revision: D13318443
fbshipit-source-id: fa740d8b1
Summary:
It materializes symbolic values of function parameters on-demand. The on-demand materialization is triggered when finding a value from an abstract memory and joining/widening abstract memories.
Depends on D13294630
Main idea:
* Symbolic values are on-demand-ly generated by a symbol path and its type
* In order to avoid infinite generation of symbolic values, symbol paths are canonicalized by structure types and field names (which means they are abstracted to the same value). For example, in a linked list, a symbolic value `x->next->next` is canonicalized to `x->next` when the structures (`*x` and `*x->next`) have the same structure type and the same field name (`next`).
Changes from the previous code:
* `Symbol.t` does not include `id` and `pname` for distinguishing symbols. Now, all symbols are compared by `path:SymbolPath.partial` and `bound_end`.
* `SymbolTable` is no longer used, which was used for generating symbolic values with new `id`s.
Reviewed By: mbouaziz
Differential Revision: D13294635
fbshipit-source-id: fa422f084
Summary:
`eval_locs` is like `eval |> get_all_locs` but avoids computing things that aren't necessary.
The goal was not to be an optimization but is needed for Java where array blocks don't have offsets.
Reviewed By: skcho
Differential Revision: D13190939
fbshipit-source-id: 1cc0e6338
Summary:
It adds symbolic locations for paramters, which will be used for fixing instantiations of parameters in the
following diffs.
Reviewed By: mbouaziz, jvillard
Differential Revision: D13214293
fbshipit-source-id: f016ea4c3
Summary:
It removes the `represents_multiple_values` parameters when we can know them from `path` values.
Depends on D12939124
Reviewed By: skcho
Differential Revision: D12939130
fbshipit-source-id: 30ff768b2
Summary: In this diff, it passes the parameter of integer type widths to evaluation functions. The parameter which will be used for casting in the following diff.
Reviewed By: mbouaziz
Differential Revision: D12920581
fbshipit-source-id: 48bbc802b
Summary:
It avoids raising an exception when unexpected arguments are given to
placement new. We will revert this after fixing the frontend to parse
user defined `new` correctly in the future.
Reviewed By: mbouaziz
Differential Revision: D10378136
fbshipit-source-id: d494f781b
Summary: It enables placement_new to get three parameters, which happens when placement_new is overloaded (e.g. Boost).
Reviewed By: mbouaziz
Differential Revision: D10100324
fbshipit-source-id: 0ecb0a404
Summary: It simplifies instantiataion of `ret_alias`. While it got `ret_alias` values by iterating caller's and callee's memory, now it gets `ret_alias` by evaluating symbol paths included in location values.
Reviewed By: mbouaziz
Differential Revision: D9569606
fbshipit-source-id: a3326bb81
Summary:
In SIL, (1) some program variables (e.g., array parameter) are used as pointers to heap addresses and (2) the other program variables (e.g., local array) are used as addresses themselves. So, the values of (1) are retrieved by the `Load` command, while that of (2) are by `Exp.Lvar` expressions directly.
To address them differently, we had managed two maps (`Mem.Stack` and `Mem.Heap`), but which introduced function duplications on abstract memory and increased complexity. This diff merges the two maps, and instead a location set is used for distinguishing two types of abstract locations during analysis.
Reviewed By: mbouaziz
Differential Revision: D9420388
fbshipit-source-id: 13f824850
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
Sungkeun Cho
Mehdi Bouaziz
Nikos Gorogiannis
Julian Sutherland
Josh Berdine
Ezgi Çiçek