Summary:
Constants are always "owned" in the sense that no one can mutate them.
In code like
```
Obj getX(boolean b) {
if (b) {
return null;
}
return new Obj();
}
```
, we need to understand this in order to infer that the returned value is owned.
This should fix a few FP's that I've seen.
Reviewed By: peterogithub
Differential Revision: D4485452
fbshipit-source-id: beae15b
Summary:
Propagating the arguments read in .inferconfig shouldn't be necessary as they
are parsed by each executable. There are corner cases where I think this diff
could change the behaviour of infer (eg, .inferconfig redefines project-root
and subsequent exes read a different .inferconfig thanks to the project-root in
INFER_ARGS), but I don't think there are good use cases like that.
Reviewed By: jberdine
Differential Revision: D4475092
fbshipit-source-id: 5c020d0
Summary:
Clients should use `Config.parse_action` instead to figure in what mode they
are operating.
In particular, the biggest change is in logging. Take the `parse_action` into
account instead of the exe, and change the log/ subdirectories to be "capture",
"driver", "analyze", and "print", corresponding to the various phases of an
infer run.
Reviewed By: jberdine
Differential Revision: D4474943
fbshipit-source-id: 6d33ad3
Summary:
Support several parsing modes: Infer, Javac, NoParse
The "Infer" mode specifies a list of sections, ie the parts of infer that are affected by an option (corresponds to the old notion of "exes"):
analysis, clang frontend, print, ...
- .inferconfig and INFER_ARGS always parsed
- outside .inferconfig and INFER_ARGS, do not parse subcommand arguments before the subcommand has been activated
- command-line is parsed or not based on the subcommand/executable selected
- executable dictates subcommand, so almost nothing depends on the executable outside of Config. Another diff will restrict the API around exes to reflect this.
Reviewed By: jberdine
Differential Revision: D4474886
fbshipit-source-id: 442dfef
Summary:
Some classes may have deleted new operator for them. To fix it, run global `new` operator instead
```
struct X {
void* operator new(size_t) = delete;
};
X *p = new X; // compilation error
X *p = ::new X; // no compilation error
```
This change is following same strategy standard headers follow.
Reviewed By: jvillard
Differential Revision: D4500977
fbshipit-source-id: 20babfa
Summary:
Infer used to report null dereference when field was accessed later:
```
vector<int> v;
int& a = v[0]; // should be EMPTY_VECTOR_ACCESS here, but it wasn't reported
int b = a; // was NULL_DEREFERENCE here
```
To avoid this problem, model all accesses to vector as dereference of its internal `beginPtr` field.
Reviewed By: jberdine
Differential Revision: D4481942
fbshipit-source-id: 2142894
Summary: This should fix the issue with broken invariants when the method specialization on pointer ends up doing a substitution on non pointer types
Reviewed By: sblackshear
Differential Revision: D4487232
fbshipit-source-id: f3fce84
Summary:
When the receiver type and return type of an unknown call are the same, propagate taint to both the receiver and the return type.
This does the right thing for common "builder-style" methods that both update and return the receiver.
We already had custom models for a few such methods (e.g., `StringBuilder.append`), but we can remove them now.
Reviewed By: jeremydubreil
Differential Revision: D4490071
fbshipit-source-id: 325ea88
Summary: The Buck integration assumes that the output jar file of all the dependency targets are available locally in order to retrieve the analysis from these targets. However, this is not guaranteed to be true when there is a cache hit on some targets. Running `buck build` with the option `--deep` forces this property.
Reviewed By: jvillard
Differential Revision: D4474036
fbshipit-source-id: accabfa
Summary: The method `junit.framework.TestCase.setUp()` is always run before the other methods by the JUnit testing framework. So the method act as a class initializer.
Reviewed By: sblackshear
Differential Revision: D4487371
fbshipit-source-id: 1998801
Summary: Just adding some more test cases on how Infer handles dynamic dispatch.
Reviewed By: jberdine
Differential Revision: D4486529
fbshipit-source-id: d90ef42
Summary:
This modifies `CTrans_utils.dereference_value_from_result` function. Reasons:
1. Type in Sil.Load tuple is supposed to be the type of Ident.t field (result), not Exp.t (source)
2. Inside `dereference_value_from_result` we used wrong type when `~strip_pointer:true` - it used original type instead of the resulting one
3. Fixing (2), uncovered similar issue in `CTrans_utils.cast_operation` - it should have used resulting type, not original one
Changed tests are expected:
1. `deprecated_hack.cpp` test was how I discovered this issue (it was very wrong)
2. the other test also had issues, now it's correct
Sadly, there was no logic I followed when writing this change - I stuffed changes in a way that fits, but it may be breaking something somewhere else.
Reviewed By: jberdine
Differential Revision: D4481895
fbshipit-source-id: b139c59
Summary:
This diff adds a set of access paths holding a value returned from a method annotated with Functional to the domain.
If a "functional" value is written to a field, we won't count that right as an unprotected access.
The idea is to be able to use the Functional annotation to get rid of benign race false positive, such as:
```
Functional T iAlwaysReturnTheSameThing();
T mCache;
T memoizedGetter() {
if (mCache == null) {
mCache = iAlwaysReturnTheSameThing();
}
return mCache;
}
```
Although there is a write-write race on `mCache`, we don't care because it will be assigned to the same value regardless of which writer wins.
Reviewed By: peterogithub
Differential Revision: D4476492
fbshipit-source-id: cfa5dfc
Summary:
We warn on unsafe accesses to fields that occur in a public method (or are reachable from a public method).
We ought not to consider VisibleForTesting methods as public, since they are only public for testing purposes.
Reviewed By: peterogithub
Differential Revision: D4477648
fbshipit-source-id: 5f58914
Summary:
The thread-safety and annotation reachibility analyses were defining ugly custom versions of override_exists with refs.
Let's give them a canonical, ref-free version instead.
Reviewed By: jberdine
Differential Revision: D4475777
fbshipit-source-id: 0bb45fc
Summary: Simple model for List methods that write to the collection.
Reviewed By: peterogithub
Differential Revision: D4453381
fbshipit-source-id: 19edc51
Summary:
One of the things that confuses me about the current annotations API is that there's a lot of ways to do the same thing.
Some of the concepts like `annotated_signature` are only really needed by Eradicate.
This diff removes usages of `annotated_signature` outside of Eradicate (everyone else was just using `get_annotated_signature` as a roundabout way to get the return annotation of a procedure).
In the future, I'll move `get_annotated_signature` and other Eradicate-specific functionality into its own module inside the Eradicate directory.
Reviewed By: jberdine
Differential Revision: D4472058
fbshipit-source-id: 5bb0846
Summary:
Stmt shouldn't have to return anything in res_trans.exps - those results shouldn't be used by parent nodes.
I need this change for another diff but given the risk I decided to put it as separate diff
Reviewed By: jvillard
Differential Revision: D4474936
fbshipit-source-id: 0537749
Summary:
`pdesc_has_annot` checks the annotations of both the return values and the parameters, which seems like a bad idea in general.
The client should have to specify which annotations they actually care about.
Converting existing uses of `pdesc_has_annot` to what I read as the intended behavior (checking the return annotation).
Will make better use of the other new functions in a follow-up.
Reviewed By: jeremydubreil
Differential Revision: D4469885
fbshipit-source-id: de5531e
Summary:
Passing the context was a bit messy and there was duplicated code. The flow is as follows:
For each node, we analyze that node and then it's children, and in some cases we use the parent node
for specifying a context for its children. Now this should be a bit more clear.
In the case of if, we specify a context based on the condition that is expected to be true inside the
if body, but not inside the else body. Here only the framework is set, more if conditions will be added to the
context in future diffs.
Reviewed By: martinoluca
Differential Revision: D4462247
fbshipit-source-id: 3512bd2
Summary:
Sometimes some instructions were never part of any CFG node and were not written to CFG at all. Add a mechanism that will create node and add them to CFG when they reach compoundStmt translation.
This is step forward to make `*x;` instruction actualy dereference x (it works in C already in C++ AST looks different though)
Reviewed By: dulmarod
Differential Revision: D4469139
fbshipit-source-id: b03b11c
Summary:
Previously, we would correctly be silent on code like `x = new T(); x.f = ...`, but would wrongly warn on code like `x = makeT(); x.f = ...`.
The reason is that we only allowed ownership through direct allocation.
This diff adds a boolean that specifies whether the return value is owned as part of the summary.
This allows us to correctly handle many common cases of (transitively) returning a freshly allocated object, but still won't work for understanding that ownership is maintained in examples like
`x = new T(); y = id(x); y.f = ...`.
Reviewed By: jvillard
Differential Revision: D4456864
fbshipit-source-id: b5eec02
Summary:
Remove the remaining uses of polymorphic equality `=`.
In case of basic types, this is replaced by String.equal or Int.equal.
In case of `= []`, this is replaced by `List.is_empty`.
In case of `= None`, this is replaced by `is_none`.
In case of a datatype definition such as `type a = A | B`,
a `compare_a` function is defined by adding `type a = A | B [@deriving compare]`
and a `equal_a` function is defined as `let equal_a = [%compare.equal : a]`.
In case of comparison with a polymorphic variant `= `Yes`, the equality
defined in `PVariant.(=)` is used. Typically, `open! Pvariant` is added
at the beginning of the file to cover all the uses.
Reviewed By: jberdine
Differential Revision: D4456129
fbshipit-source-id: f31c433
Summary: Also updated the doc comment of `parse`, it had gone a bit out of sync.
Reviewed By: jberdine
Differential Revision: D4435580
fbshipit-source-id: bb1a6f2
Sam Blackshear
Jules Villard
Andrzej Kotulski
Cristiano Calcagno
Jeremy Dubreil
Dulma Churchill
Kihong Heo