Summary:
Turns out, analyzer was getting confused with complicated
model and it was reporting empty access in places it
shouldn't. Fixing backend is not trivial (tracing mode is the answer),
but the model can be simplified.
It introduces the problem that get() method doesn't return fresh value
every time, but we should be able to change backend later to deal with it.
Reviewed By: sblackshear
Differential Revision: D3328228
fbshipit-source-id: dddbaf8
Summary:
Create model of C++ std::vector to find occurrences when vector which might be empty is accessed. Do it by triggering null dereference every time empty vector access is performed.
Note: model will be used only when c++11 (or c++14) are used.
Reviewed By: sblackshear
Differential Revision: D3276203
fbshipit-source-id: 420a95a
Summary:
The philosophy of the tracing mode reporting is to not report the errors in a method if reaching this error does depend on information that can be false at call site. Typically with:
void foo(Object obj, int x) {
if (x == 3) {
obj.toString();
}
}
it may be that we always call `foo` with a non-null parameter or `x != 3`.
Thechnically, the reporting code matches the pairs of the form (precondition, error) and filtering out the cases where the precondtions was not imposing constraints on the calling context, and report the other cases. So the NPE could be reported in the following case:
void bar() {
foo(null, 3);
}
However, we were missing the case where there was anyway no way to call a method in a safe way, i.e. all the preconditions were of the form: (precondition, error), for example:
void baz(boolean b) {
if (b) {
foo(null, 3);
} else {
foo(null, 3);
}
}
In that case, the summary is of the form
PRE (1): b = false
POST: NullPointerException
PRE (2): b = true
POST: NullPointerException
In which case it is legit to report `NullPointerException` in `baz`.
Reviewed By: sblackshear, jberdine
Differential Revision: D3220501
fb-gh-sync-id: 7fb7d70
fbshipit-source-id: 7fb7d70
Summary: Example of dynamic dispatch with interfaces were already working. Adding some tests now so that we don't break this.
Reviewed By: sblackshear
Differential Revision: D3220360
fb-gh-sync-id: 11395dd
fbshipit-source-id: 11395dd
Summary: For performance critical sections of the code, this checker detects memory allocations or calls to methods annotated as expensive. However, such cases of memory allocations or expensive calls are acceptable is occuring in rare cases. This diff adds supports for the "unlikely" branch prediction method and does not track expensive calls in unlikely branches.
Reviewed By: sblackshear
Differential Revision: D3193473
fb-gh-sync-id: ea87e49
fbshipit-source-id: ea87e49
Summary:BinaryConditionalOperator should evaluate condition expression once, but we used to evaluate it twice.
Fix translation to account for it.
Reviewed By: dulmarod
Differential Revision: D3179803
fb-gh-sync-id: a801a7e
fbshipit-source-id: a801a7e
Summary:This diff translate cpp lambdas. For the moment it does not take care of
captured variables. Captured variables will come in the next diff.
Reviewed By: dulmarod
Differential Revision: D3114790
fb-gh-sync-id: bf36450
fbshipit-source-id: bf36450
Summary:public
When a conditional is the last instruction, there will be a join node leading directly to the exit node.
Some instructions, such as nullification of dead variables, and abstraction, are added to the control flow graph automatically. But, join nodes cannot contain instructions. So when a procedure ends with a conditional, there might be no place to store these instructions.
This diff adds one extra node between the join and the exit node in that situation.
Reviewed By: jvillard
Differential Revision: D3179056
fb-gh-sync-id: 2b9cd7e
fbshipit-source-id: 2b9cd7e
Summary:public
Add modeling of methods that can raise exceptions when parameters are
nil, and that return nil when passed nil.
Reviewed By: dulmarod
Differential Revision: D3101739
fb-gh-sync-id: 76af5a2
fbshipit-source-id: 76af5a2
Summary:public
Create a model of std::unique_ptr in similar fashion to what was done to std::shared_ptr.
For now, we are modeling it as container of raw pointer (no ownership concept).
This time unique_ptr is not derived from std__unique_ptr (unlike shared_ptr, it was easier to not do that) and so we need to provide implementations for all non-member functions per C++ reference:
http://en.cppreference.com/w/cpp/memory/unique_ptr
Reviewed By: dulmarod
Differential Revision: D3048209
fb-gh-sync-id: a9a6455
shipit-source-id: a9a6455
Summary:public
Before this diff, the Java frontend was not adding the definition of the inherited interfaces to the type environment, thus failing to answer questions like "does type X implements Closeable". Infer was therefore missing to detect resource leaks when the resource was indirectly implementing Closeable via an intermediate interface.
Reviewed By: sblackshear
Differential Revision: D3067555
fb-gh-sync-id: 86d0760
shipit-source-id: 86d0760
Summary:public
Implementation of std::move is straightforward and infer understands it without
any problems. To use it, we translate it even though it's coming from system headers.
Reviewed By: jvillard
Differential Revision: D3064019
fb-gh-sync-id: 823ae75
shipit-source-id: 823ae75
Summary:This pull request adds the SuppressViewNullability annotation.
The reasoning behind this is that in libraries, one cannot use Butterknife for view binding, which forces you to do it manually. Basically, this makes a new annotation that infer treats the same way as Bind/InjectView
Closes https://github.com/facebook/infer/pull/301
Reviewed By: jvillard
Differential Revision: D3047235
Pulled By: cristianoc
fb-gh-sync-id: 6286d2b
shipit-source-id: 6286d2b
Summary:public
Create initial model of C++ std::shared_ptr. This means that infer will replace implementation of
shared_ptr and the resulting binary will change. Make sure no one will run it by crashing any binary that includes that code.
Reviewed By: jvillard
Differential Revision: D2999948
fb-gh-sync-id: 5753559
shipit-source-id: 5753559
Summary:public This also required a refactoring of InitListExpr.
The idea is that ImplicitValueInitExpr can stand for initialising a whole struct,
so we translating as a list of zero expressions, according to the struct's fields,
which is then paired with a list of field expressions, such that one get a list of
assignment instructions.
Reviewed By: ddino
Differential Revision: D2999875
fb-gh-sync-id: 7f609a0
shipit-source-id: 7f609a0
Summary:public
Lazy dynamic dispatch handling works as follows:
Assuming a call of the form:
foo(a);
where the static type of `a` is `A`. If during the symbolic execution, the dynamic type of the variable `a` is `B` where `B <: A`, then we create on-demand a copy `foo(B)` of `foo(A)` where all the uses of the typed parameter `a` are replaced with a parameter of type `B`. Especially, if `foo` contains virtual call, say `get` where `a` is the receiver, then the call gets redirected to the overridden method in `B`, which simulates the runtime behavior of Java.
This lazy dynamic dispatch mode is only turn on for the tracing mode for now in order to avoid conflicts with sblackshear's approach for sound dynamic dispatch.
Reviewed By: sblackshear
Differential Revision: D2888922
fb-gh-sync-id: 3250c9e
shipit-source-id: 3250c9e
Summary:public
Deprecate the incremental mode.
Several parts of the back-end can be removed.
The options for incremental analysis -i at the python level are now deprecated, and re-routed to --reactive.
The main difference with --reactive is that it does not produce an analysis of the whole project, but is limited to what is reachable via reactive propagation starting from the changed files.
Reviewed By: sblackshear
Differential Revision: D2960078
fb-gh-sync-id: 6e8b46b
shipit-source-id: 6e8b46b
Summary:public
An observer object that registered to a notification center needs to be
unregistered before it is deallocated.
If not, the notification center may send a notification to a gost object.
This diff introduce a checker for this problem.
Reviewed By: dulmarod
Differential Revision: D2949692
fb-gh-sync-id: 1653cec
shipit-source-id: 1653cec
Summary:public
Add extra dereference when accessing fields that have T& type. It is similar
to what is done when accessing variables of T& type.
The only difference is that we need to handle constructor initializer list
separately (this is the only place where the field can be initialized)
Reviewed By: ddino
Differential Revision: D2965887
fb-gh-sync-id: 1b8708b
shipit-source-id: 1b8708b
Summary:public
This just simplifies the end-to-end tests for Dividde By Zero to make the debugging easier when this test fails.
Reviewed By: cristianoc
Differential Revision: D2966296
fb-gh-sync-id: 5eaa1b5
shipit-source-id: 5eaa1b5
Summary:public
Create separate specs for C models compiled in C++. It will allow us to tweak behavior/names of certain
functions based on the compilation language (such as adding `std::` namespace in C++).
Reviewed By: jvillard
Differential Revision: D2938992
fb-gh-sync-id: 73902f8
shipit-source-id: 73902f8
Summary:public
Add to the code to detect violation of the `NoAllocation` annotation. This diff adds the code to detect such issue based on the code of the `PerformanceCritical` checker. In the next diff, I will refine the list of acceptable allocations, like new exceptions, etc, and add the list of corresponding tests.
Reviewed By: sblackshear
Differential Revision: D2938641
fb-gh-sync-id: 9a047dd
shipit-source-id: 9a047dd
Summary:public We model it as the builtin __instanceof which models the instanceof construct of Java.
The behaviour is the same.
Reviewed By: jvillard
Differential Revision: D2938969
fb-gh-sync-id: 2258de3
shipit-source-id: 2258de3
Summary:public
Translate headers every time they are included provided that they are located inside project_root directory.
While this is suboptimal (we might end up translating same header many times), doing it exactly once
is hard due to parallel compilation and template instantiations
Reviewed By: dulmarod
Differential Revision: D2916799
fb-gh-sync-id: 93b72c4
shipit-source-id: 93b72c4
Summary:public
Is seems that automatically inheriting annotations like `PerformanceCritical` or `NoAllocation` is the right thing to do in general. Otherwise, we need to enforce sub-typing rules which in the best case just adds a little bit of documentation, but could miss important issues when the code is not fully annotated. I am simplifying this part to avoid adding boilerplate code for the `NoAllocation` case.
Reviewed By: sblackshear
Differential Revision: D2938627
fb-gh-sync-id: ddb668b
shipit-source-id: ddb668b
Summary:
public
Avoid problems of overwriting good type information with incomplete information
when type declaration happens after its complete definition.
The solution is that we will only time we *update* type information is
when struct declaration has definition as well (which should happen once)
Reviewed By: cristianoc, sblackshear
Differential Revision: D2921811
fb-gh-sync-id: 16baba3
shipit-source-id: 16baba3
Summary:
public
The inductive list predicate was not firing during abstraction because of a type mismatch between C and Java. In Java, the second parameter of the `Sil.Sizeof` constructor is always `Sil.Subtype.exact` in C but is `Sil.Subtype.subtypes` in Java. This diff fixes the confution by comparing the `Sil` types only instead of the type expressions.
Reviewed By: jberdine
Differential Revision: D2912493
fb-gh-sync-id: 3f712a8
shipit-source-id: 3f712a8
Summary:
public
1. Add support for temporary C++ objects.
2. Make constructor calls return constructed objects - it allows us pass them as parameters to another constructs (such as parameters, member expressions etc.)
3. Translate FunctionalCastExpr which sometimes is used instead of CXXTemporaryObjectExpr
Reviewed By: dulmarod
Differential Revision: D2874916
fb-gh-sync-id: d9ac2cc
Summary:
public
1. Change exps result of translating call expressions
2. Modify field/method_deref_trans to make them work with rvalues returned by function
3. Add E2E test
Reviewed By: jberdine
Differential Revision: D2874822
fb-gh-sync-id: 42c617d
Summary:
public
This diff fixes a race condition where errors found in a procedure by one checker could be overwritten by running on demand the analysis of the same procedure with another checker.
Reviewed By: cristianoc
Differential Revision: D2847308
fb-gh-sync-id: 4f0c78e
Summary:
public
otherwise Infer cannot know the type of the temporary variable
Reviewed By: dulmarod
Differential Revision: D2845054
fb-gh-sync-id: cf5fb8d
Summary:
public
This diff cleans up the detection of assertion failures in C, C++ and Objective C which was previously hacked on top of the tracing mode for Java. The code is also generalized to detect any custom errors which can be defined using the `__infer_fail` builtin, and the case of assertion failure is now just the specific case of translating `assert` using `__infer_fail` directly in the clang frontend.
Reviewed By: jberdine
Differential Revision: D2786574
fb-gh-sync-id: dd1e1cf
Summary: public In this example we now get a dangling pointer dereference, so contains exactly doesn't work.
Reviewed By: jvillard
Differential Revision: D2773769
fb-gh-sync-id: 64d1044
Summary:
public To deal with ObjC nullability and give meaningful error
messages, we introduced the ObjC_NULL attribute in the symbolic execution to
mean that the object carrying the attribute is null because it was the result
of a method call from a null object. However, one cannot add attributes to null,
so we had to delay nullifying the object in order to have the attribute until we
can assign it to a program variable. However, if the temp variable was used in a condition,
we were not taking into account that its meaning is null. This diff addresses that and fixes
many FPs that we have encounter.
Reviewed By: ddino
Differential Revision: D2765167
fb-gh-sync-id: c0878dd
Summary:
public
The contravariant subtyping rule for the PerformanceCritial annotation was meant to document the code but can be very too verbose on exisiting project. It is also not necessary as we can get this annotation from the supertypes. I am disabling it for now, but keep the code in case we want to revive it at some point in the future.
Reviewed By: sblackshear
Differential Revision: D2750212
fb-gh-sync-id: 2424281
Summary:
public
Lines other than the first of multi-line comments in non-ocaml files
were flush right instead of aligned.
Reviewed By: jvillard
Differential Revision: D2739752
fb-gh-sync-id: c85f56e
Summary:
public
It is possible to return null according to
http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#getResource(java.lang.String).
Also, getResource throws NPE if passed null:
$ cat -n TestClassGetResourceArgument.java
1 import java.net.URL;
2
3 public class TestClassGetResourceArgument {
4
5 static URL testClassGetResourceArgument(Class cls) {
6 return cls.getResource(null);
7 }
8
9 public static void main(String[] args) {
10 System.out.println(testClassGetResourceArgument("".getClass()).toString());
11 }
12
13 }
$ javac TestClassGetResourceArgument.java && java TestClassGetResourceArgument
Exception in thread "main" java.lang.NullPointerException
at sun.misc.MetaIndex.mayContain(MetaIndex.java:243)
at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:830)
at sun.misc.URLClassPath.getResource(URLClassPath.java:199)
at sun.misc.URLClassPath.getResource(URLClassPath.java:251)
at java.lang.ClassLoader.getBootstrapResource(ClassLoader.java:1305)
at java.lang.ClassLoader.getResource(ClassLoader.java:1144)
at java.lang.ClassLoader.getResource(ClassLoader.java:1142)
at java.lang.ClassLoader.getSystemResource(ClassLoader.java:1267)
at java.lang.Class.getResource(Class.java:2145)
at TestClassGetResourceArgument.testClassGetResourceArgument(TestClassGetResourceArgument.java:6)
at TestClassGetResourceArgument.main(TestClassGetResourceArgument.java:10)
Reviewed By: cristianoc
Differential Revision: D2752301
fb-gh-sync-id: 888baf1
Summary:
public
Remove double negation in test check as per jrm's comment on D2695548.
Reviewed By: jeremydubreil
Differential Revision: D2743862
fb-gh-sync-id: d7cc0d0
Summary:
public
Added special modelling for m.put(k,v) as assigning value v to map m at key k.
The modelling is analogous to the one for containsKey: the variable used to represent m.get(k) is generated, and assigned the value v.
Reviewed By: jberdine
Differential Revision: D2743844
fb-gh-sync-id: 56d3581
Summary:
Change eradicate handling of complex values so that an unknown function that
has an existing mapping to Undef is treated as if there was no existing
mapping.
Without this change, joining control-flow branches where one called a function
and the other did not resulted in a mapping to Undef. Later calls to the
function would then reuse the Undef mapping.
public
Reviewed By: cristianoc
Differential Revision: D2695548
fb-gh-sync-id: ab69c47
Summary:
public
After supporting template classes and template functions, it's time
to support template methods (they are very similar to template functions)
Reviewed By: dulmarod
Differential Revision: D2734807
fb-gh-sync-id: 41c7f96
Summary:
public The ivar corresponding to the property is only available in the ast when the
implementation of the peroperty is available. Otherwise we add an ivar with the correct type
and the default name to the tenv and use it in the getter (and later in the setter).
This was not causing crashes because the generated code was swallowing the Missing_fld exception.
Now it flags it.
Reviewed By: akotulski
Differential Revision: D2734217
fb-gh-sync-id: 21c62af
Andrzej Kotulski
Dino Distefano
Sam Blackshear
Dulma Churchill
Jeremy Dubreil
Peter O'Hearn
Cristiano Calcagno
Josh Berdine
Nick Firmani
Jules Villard