Summary:
When a C++ temporary goes out of scope, tag its address in the heap with
a new attribute `AddressOfCppTemporary` so that we can later check that
we don't return it.
Reviewed By: da319
Differential Revision: D13466898
fbshipit-source-id: 8808338b4
Summary:
When assign to the special `return` variable, check that the result is
not the address of a local variable, otherwise report.
Reviewed By: ngorogiannis
Differential Revision: D13466896
fbshipit-source-id: 465da7f13
Summary: Naming it `FP_` was a mistake in the original commit that copied the tests over as pulse has never reported on that method.
Reviewed By: da319
Differential Revision: D13465324
fbshipit-source-id: f8b24ebda
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's ok to take an address of a field / array access of an invalid object.
This diff calculates the inner most dereference for an access expression starting with `&` and does not report on the dereference even if the address is invalid.
Reviewed By: jvillard
Differential Revision: D13450758
fbshipit-source-id: 18c038701
Summary:
When we create Dereference edge, we also create TakeAddress back edge. This causes false positives for stack variables. When we write to a stack variable and then take its address, the resulting address is the one from the back edge of the written value. See example `push_back_value_ok`. To solve this issue, this diff changes stack to denote a map from address of variables rather than from variables.
We still have issue for fields, see example, FP_push_back_value_field_ok. To solve this, we probably need to remove back edges.
Reviewed By: jvillard
Differential Revision: D13432415
fbshipit-source-id: 9254a1a6d
Summary:
When a lambda gets created, record the abstract addresses it captures, then
complain if we see some of them be invalidated before it is called.
Add a notion of "allocator" for reporting better messages. The messages are
still a bit sucky, will need to improve them more generally at some point.
```
jul lambda ~ infer 1 infer -g --pulse-only -- clang -std=c++11 -c infer/tests/codetoanalyze/cpp/pulse/closures.cpp
Logs in /home/jul/infer.fb/infer-out/logs
Capturing in make/cc mode...
Found 1 source file to analyze in /home/jul/infer.fb/infer-out
Found 2 issues
infer/tests/codetoanalyze/cpp/pulse/closures.cpp:21: error: USE_AFTER_DESTRUCTOR
`&(f)` accesses address `s` captured by `&(f)` as `s` invalidated by destructor call `S_~S(s)` at line 20, column 3 past its lifetime (debug: 5).
19. f = [&s] { return s.f; };
20. } // destructor for s called here
21. > return f(); // s used here
22. }
23.
infer/tests/codetoanalyze/cpp/pulse/closures.cpp:30: error: USE_AFTER_DESTRUCTOR
`&(f)` accesses address `s` captured by `&(f)` as `s` invalidated by destructor call `S_~S(s)` at line 29, column 3 past its lifetime (debug: 8).
28. f = [&] { return s.f; };
29. }
30. > return f();
31. }
32.
Summary of the reports
USE_AFTER_DESTRUCTOR: 2
```
Reviewed By: da319
Differential Revision: D13400074
fbshipit-source-id: 3c68ff4ea
Summary: Model more `std::vector` functions that can potentially invalidate references to vector's elements (https://en.cppreference.com/w/cpp/container/vector).
Reviewed By: mbouaziz
Differential Revision: D13399161
fbshipit-source-id: 95cf2cae6
Summary:
Some code calls `this->~Obj()` then proceeds to use fields in the current
object, which previously we would report as invalid uses. Assume people know
what they are doing and ignore destructor calls to `this`.
Reviewed By: mbouaziz
Differential Revision: D13401145
fbshipit-source-id: f6b0fb6ec
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: Similarly as `std::vector::push_back`, `std::vector::reserve` can invalidate the references to elements if the new size is bigger than the existing one. More info on `std::vector::reserve`: https://en.cppreference.com/w/cpp/container/vector/reserve
Reviewed By: jvillard
Differential Revision: D13340324
fbshipit-source-id: bf99b6923
Mehdi Bouaziz
Jules Villard
Jeremy Dubreil
Sungkeun Cho
Nikos Gorogiannis
Ezgi Çiçek
Daiva Naudziuniene
Fabio Milano
David Lively
Ted Reed