Summary:
This confuses the SIOF checker and causes false positives. This dummy deref is
generated for constructors of classes that are modeled as being pointer types
instead of the actual class in infer, typically for smart pointers. I do not
understand how this works.
The biabduction also analyses this code, so might now get confused itself.
Reviewed By: jberdine
Differential Revision: D6221817
fbshipit-source-id: 050c5a9
Summary:
Install ocamlformat from github as part of `make devsetup`, and use it
for formatting OCaml (and jbuild) code.
Reviewed By: jvillard
Differential Revision: D6092464
fbshipit-source-id: 4ba0845
Summary:
We need to make sure that destructors of virtual base classes are called only once. Similarly to what clang does, we have two destructors for a class: a destructor wrapper and an inner destructor.
Destructor wrapper is called from outside, i.e., when variables go out of scope or when destructors of fields are being called.
Destructor wrappers have calls to inner destructors of all virtual base classes in the inheritance as their bodies.
Inner destructors have destructor bodies and calls to destructor wrappers of fields and inner destructors of non-virtual base classes.
Reviewed By: dulmarod
Differential Revision: D5834555
fbshipit-source-id: 51db238
Summary:
The "placement new" operator `new (e) T` constructs a `T` in the pre-allocated memory address `e`.
We weren't translating the `e` part, which was leading to false positives in the dead store analysis.
Reviewed By: dulmarod
Differential Revision: D5814191
fbshipit-source-id: 05c6fa9
Summary:
Simple instance of the problem: analyzing the following program times out.
```
#include <tuple>
void foo() {
std::tuple<std::tuple<int>> x;
}
```
Replacing `std::tuple<std::tuple<int>>` by `std::tuple<int>` makes the analysis
terminate.
In the AST, both tuple<tuple<int>> and tuple<int> have the same template
specialization type: "Pack" (which means we're supposed to go look into the
arguments of the template to get their values). This is not information enough
and that's the plugin fault.
On the backend side, this means that two types have the same Typ.Name.t, namely
"std::tuple<_>", so they collide in the tenv. The definition of
tuple<tuple<int>> is the one making it into the tenv. One of the fields of the
corresponding CxxRecord is of type "tuple<int>", which we see as the same
"tuple<_>", which causes the loop.
update-submodule: facebook-clang-plugins
Reviewed By: mbouaziz
Differential Revision: D5775840
fbshipit-source-id: 0528604
Summary:
The clang frontend uses `assert false` for unimplemented features that should
abort method translations, as well as for genuine internal errors.
Distinguishing between the two, we can fail hard on the latter and not the
former.
1. This introduces a new exception `Unimplemented` that is used instead of `assert false` where appropriate.
2. Changed some other cases into `die ...` (when there's an error message to display)
3. Wherever a path in the code that we assumed to be unreachable was observed reachable, we now raise `IncorrectAssumption`. These should be fixed, but the fixes are not obvious.
Reviewed By: sblackshear
Differential Revision: D5784384
fbshipit-source-id: 61b55af
Summary:
In the most recent version of clang plugin, lambda captures were moved from `LambdaExpr` to `CXXRecordDecl`. Updating infer to reflect this change.
update-submodule: facebook-clang-plugins
Reviewed By: jvillard
Differential Revision: D5823034
fbshipit-source-id: dd5fc45
Summary: Destroying local variables that are out of scope after `continue`.
Reviewed By: jberdine
Differential Revision: D5804120
fbshipit-source-id: 638cff5
Summary: Destroying local variables that are out of scope after `break`.
Reviewed By: jberdine
Differential Revision: D5764647
fbshipit-source-id: a7e06ae
Summary: The successor node of `continue` was not correct inside the `do while`.
Reviewed By: sblackshear
Differential Revision: D5769578
fbshipit-source-id: d7b0843
Summary:
The behaviour of infer was observed to be different in 4.04.2 vs (4.05.0 or
4.04.2+flambda). Investigating further, the behaviour is also different in byte
vs native versions of infer under 4.04.2. Looking at the Changelog of 4.05.0
(thanks mbouaziz), there are fixes for inconsistent behaviours between byte
and native relative to evaluation order.
Lots of debugging later, this 1 line patch is born. Also use `List.concat_map`
instead of re-implementing it.
Reviewed By: jberdine
Differential Revision: D5793809
fbshipit-source-id: 374fb4c
Summary:
Not translating these properly was causing false positives for the dead store analysis in cases like
```
int i = 0;
return [j = i]() { return j; }();
```
Reviewed By: da319
Differential Revision: D5731562
fbshipit-source-id: ae79ac8
Summary: We inject destructor calls of base classes inside destructor bodies after the destructor calls of fields.
Reviewed By: dulmarod
Differential Revision: D5745499
fbshipit-source-id: 90745ec
Summary: Refactoring destructor translation to take type pointer instead of qual type as a parameter, as we only have type pointers for base classes.
Reviewed By: dulmarod
Differential Revision: D5745490
fbshipit-source-id: 121f492
Summary: We used to crash whenever we hit these. The simple translation implemented here is not particularly inspiring, but it is better than crashing.
Reviewed By: jvillard
Differential Revision: D5702095
fbshipit-source-id: 3795d43
Summary:
Previous version was hard to understand because it was doing many things within same code. New version has different code for Arrays, Structs and others.
There is some copy-paste, but it's easier to follow code (open to suggestions though)
Reviewed By: dulmarod
Differential Revision: D5547999
fbshipit-source-id: 77ecb24
Summary: Working on making CFG immutable by killing refs to functions that mutate them. This is an easy one because it doesn't do anything :).
Reviewed By: jeremydubreil, mbouaziz
Differential Revision: D5551521
fbshipit-source-id: bec76a9
Summary:
update-submodule: facebook-clang-plugins
Moving to a newer version of clang, see ffb5dd0114
Reviewed By: jvillard
Differential Revision: D5452529
fbshipit-source-id: 28bc215
Summary: CFG nodes were not connected and some instructions ended up in wrong place. Fix those issues
Reviewed By: dulmarod
Differential Revision: D5406720
fbshipit-source-id: 2a70e1a
Summary:
Conversion and reformat of infer source using ocamlformat
auto-formatting tool.
Current status:
- Because Reason does not handle docstrings, the output of the
conversion is not 'Warning 50'-clean, meaning that there are
docstrings with ambiguous placement. I'll need to manually fix
them just before landing.
Reviewed By: jvillard
Differential Revision: D5225546
fbshipit-source-id: 3bd2786
Summary:
This diff tries to achieve the followings: if we have the following C++ codes:
```
bool foo(int x, int y) {
return &x == &y;
}
```
We want the C++ frontend to emit Sil as if the input is written as
```
bool foo(int x, int y) {
if (&x == &y) return 1; else return 0;
}
```
This matches the behavior of our Java frontend.
The reason why we prefer an explicit branch is that it will force the backend to eagerly produce two different specs for `foo`. Without the explicit branch, for the above example the backend would produce one spec with `return = (&x == &y)` as the post condition, which is not ideal because (1) we don't want local variables to escape to the function summary, and (2) with the knowledge that no two local variables may alias each other, the backend could actually determines that `&x == &y` is always false, emitting a more precise postcondition `return = 0`. This is not possible if we do not eagerly resolve the comparison expression.
Reviewed By: akotulski
Differential Revision: D5260745
fbshipit-source-id: 6bbbf99
Summary:
Change the API of `Logging` wrt to writing to files and to the console (see
changes in logging.mli).
Write only to one log file: infer-out/log. Prefix each line with the kind of
warning and the PID of the process emitting it. Writing with `O_APPEND` is
atomic so the file should not get garbled by concurrent writes. To get the
output of a single process, find out which one interests you by looking at
infer-out/log, then `grep ^[<PID>] infer-out/log`.
Introduce 3 log levels for debug output and command-line options to set them
for various categories individually.
Change tons of `"\n"` to `"@\n"` so the `Format` module is aware of newlines
without us having to look through every character of every logged string for
`\n` characters.
Reviewed By: mbouaziz
Differential Revision: D5165317
fbshipit-source-id: 93c922f
Summary:
Spacetime profiling showed that this was allocating a lot more than it needs
to. Switching to a `Hashtbl` makes the memory overhead go away, and halves the
memory consumption of the whole frontend on some pathological files.
This also brings the file "clang_ast_main.ml" into the infer repo, renamed to
"ClangPointers.ml" (and given an mli). It's useful to have something like
"clang_ast_main.ml" checked into the facebook-clang-plugins repo to illustrate
how to use the OCaml AST visitor generated by atdgen, but it can be simplified
to be more pedagogical instead of being the visitor used in infer.
Reviewed By: jberdine
Differential Revision: D4884383
fbshipit-source-id: 88f324a
Summary:
A recent diff tried to replace `L.out "error message"; assert false` with
`failwith "error message"` but infer relies on the type of raised exceptions to
sometimes keep going. A more careful change will be needed but in the meantime
restore the old behaviour.
Reviewed By: jberdine
Differential Revision: D5112969
fbshipit-source-id: 713fe20
Summary:
Try and enforce the following rules:
- stderr is for updating the user about progress or errors
- Introduce Logging.progress that outputs to stderr, but honours --quiet
- Logging.stderr is as before
- Logging.out now prints to stderr (or to log files as before if set up) and
not stdout. If some information should go on stdout then the user should be
able to rely on it (ie, it's not just some progress message). For now only
the summary of the errors is printed on stdout by default.
- Logging.err* functions are gone. If the error is user-visible, it should be
Logging.stderr, or `failwith`. If not, go to the same log file as other
output, which personally I find much more convenient than having to dig through
2 log files every time I'm looking for some output.
Reviewed By: jberdine
Differential Revision: D5095720
fbshipit-source-id: 68999c9
Summary:
Previously all knowledge of the dynamic length of such arrays was lost to infer:
```
void foo(int len) {
int a[len];
}
```
The translation of this program would make no reference to `len` (except as a
param of `foo`).
Translate this "initialization" using the existing `__set_array_length` infer
builtin, as:
```
# Declare local a[_]
n$0 = len;
__set_array_length(a, len);
```
update-submodule: facebook-clang-plugins
Reviewed By: mbouaziz
Differential Revision: D4969446
fbshipit-source-id: dff860f
Summary:
An array has a static or dynamic length (number of elements), but it also has a
stride, determined by the type of the element: `sizeof(element_type)`. We don't
have a good `sizeof()` function available on SIL types, so record that stride
in the array type.
update-submodule: facebook-clang-plugins
Reviewed By: mbouaziz
Differential Revision: D4969697
fbshipit-source-id: 98e0670
Summary:
Add `volatile` and `restrict` type qualifiers. Change `Ast_expressions.create_*_type` functions
to always get optional type quals argument.
update-submodule: facebook-clang-plugins
Reviewed By: jberdine
Differential Revision: D4969634
fbshipit-source-id: 9a63bf7
Summary:
Modify the type of `Exp.Sizeof ...` to include the value that the expression
evaluates to according to the compiler, or None if it cannot be known
statically.
Use this information in inferbo.
Mostly unused in the BiAbduction checker for now, although it could be useful
there too.
update-submodule: facebook-clang-plugins
Reviewed By: mbouaziz
Differential Revision: D4953634
fbshipit-source-id: be0999d
Summary:
Backend needs to know whether type is const or not. In order to achieve it, frontend needs to know it first.
This diff changes bunch of things:
- update clang plugin to have AST exporter actually export that info most of the time
- change types of functions in clang frontend until it compiles
- replace `type_ptr` with `qual_type` and `tp` with `qt` in names where applicable
- cleanup some things in the process
update-submodule: facebook-clang-plugins
Reviewed By: jvillard
Differential Revision: D4938567
fbshipit-source-id: 716b3ef
Summary: `__attribute__((annotate("")))` is better way of passing information to the frontend
Reviewed By: jberdine
Differential Revision: D4818805
fbshipit-source-id: 6e8add2
Summary:
Don't pass names as strings in clang frontend. Instead use QualifiedCppName which preserves
each identifier of qualified name.
Done by
1. change return type of `Cast_utils.get_qualified_name` to return `QualifiedCppName.t`
2. change types in `Typ.Name.t` and `Typ.Procname.t` to use qualified names where applicable
3. Keep changing the code until it compiles
Reviewed By: jberdine
Differential Revision: D4754242
fbshipit-source-id: 9d723cb
Summary:
This issue was spotted in the wild. There may be more of those, unfortunately it's hard to predict
More general problem is that types in infer frontend diverge from clang's types for DerivedToBase cast.
Then, infer uses types from clang anyway and that confuses backend. Getting it always right is very hard
Reviewed By: jvillard
Differential Revision: D4754081
fbshipit-source-id: 5fb7069
Summary:
Provide proper constructor functions for all Typenames following `Typename.Java` module.
Always use those constructor functions.
Reviewed By: jeremydubreil
Differential Revision: D4673943
fbshipit-source-id: 81625c2
Summary:
It used to be string which:
1. Doesn't have enough information for parametric models
2. Doesn't have good type
Changing this blows up in clang frontend, but I think it's for the better
Reviewed By: jberdine
Differential Revision: D4667633
fbshipit-source-id: 9f61bf1
Summary: procnames will depend on Typ.t soon and we need to go from `type_ptr` to `Typ.t` when creating procnames. `CType_decl` does this translation it can't depend on `mk_procname_` functions.
Reviewed By: jvillard
Differential Revision: D4620560
fbshipit-source-id: 9524178
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:
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:
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:
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:
Module CFrontend_utils is a container for two modules: Ast_utils and General_utils.
Instead of opening CFrontend_utils in several places, it is now split into two separate modules CAst_utils and CGeneral_utils, which are now accessed directly.
Reviewed By: jberdine
Differential Revision: D4392710
fbshipit-source-id: ea756a2
Summary:
Use In_channel and Out_channel operations instead of those in Pervasives. Don't
use physical equality on values that aren't heap-allocated since it doesn't help
the compiler generate faster code and the semantics is unspecified. Also use
phys_equal for physical equality.
Reviewed By: sblackshear
Differential Revision: D4232459
fbshipit-source-id: 36fcfa8
Summary:
Utils contains definitions intended to be in the global namespace for
all of the infer code-base, as well as pretty-printing functions, and
assorted utility functions mostly for dealing with files and processes.
This diff changes the module opened into the global namespace to
IStd (Std conflict with extlib), and moves the pretty-printing
definitions from Utils to Pp.
Reviewed By: jvillard
Differential Revision: D4232457
fbshipit-source-id: 1e070e0
Summary:
curr_file is remnant of the past when we didn't have good location information
coming from Clang_ast_t location. But it was fixed ~1 year ago.
Reviewed By: jvillard
Differential Revision: D4139750
fbshipit-source-id: 4ce7235
Summary:
this makes frontends no longer depend on SymExec.ml. `ModelBuiltins` was split into two modules:
- `BuiltinDecl` with procnames for builtins (used to determine whether some function is a builtin)
- `BuiltinDefn` with implementations used by `SymExec`
- they both have similar type defined in `BUILTINS.S` which makes sure that new builtin gets added into both modules.
During the refactor I ran some scripts:
`BuiltinDecl.ml`:
let X = create_procname "X"
cat BuiltinDecl.ml | grep "create_procname" | tail -70 | awk ' { print $1,$2,$3,$4,"\42"$2"\42"} '
then manually confirm string match. Exceptions:
"__exit" -> "_exit"
"objc_cpp_throw" -> "__infer_objc_cpp_throw"
__objc_dictionary_literal
nsArray_arrayWithObjects
nsArray_arrayWithObjectsCount
`BuiltinDefn.ml`:
let X = Builtin.register BuiltinDecl.X execute_X
cat BuiltinDecl.ml | grep "create_procname" | tail -70 | awk ' { print $1,$2,$3,"Builtin.register BuiltinDecl."$2,"execute_"$2} '
then, fix all compilation problems
Reviewed By: jberdine
Differential Revision: D3951035
fbshipit-source-id: f059602
Summary: The frontend replaces global variables that are constant with their values as a quick hack to improve the precision of the analysis. This should apply to `constexpr` too.
Reviewed By: dulmarod
Differential Revision: D4058097
fbshipit-source-id: be4fea6
Summary:
This changes executions of the former InferClang into a function call. In
particular, it can be called several times per execution.
The new InferClang must be called as if it was clang, and knows how to run
clang with our plugin to get the AST of the source file.
Reviewed By: akotulski
Differential Revision: D3981017
fbshipit-source-id: 7af6490
Summary: it seems to have no effect on analysis. As such it should be ok to add cg nodes for builtin model calls
Reviewed By: jberdine
Differential Revision: D3967399
fbshipit-source-id: 06c32e5
Summary:
This is needed for later: InferClang will no longer be started once for each
source file to be analysed. Instead, it will be called to analyse several files
at once, and will analyse them one by one. Thus, `clang_lang` and `source_file`
are moved to `cFrontend_config` as references.
The biggest change this entailed was the new logging infrastructure, which was
depending on `Config.source_file`. This diff moves the logic entirely to
`Logging`, and changes the API so that executables wishing to log into files
have to set it up using `Logging.set_log_file_identifier`. This can be called
several times during the execution, allowing to dynamically change the log file
(eg, when analysing several source files one by one!).
Reviewed By: jberdine
Differential Revision: D3944148
fbshipit-source-id: 6129090
Summary: That data was never used and removing it can simplify frontends quite a bit.
Reviewed By: jberdine
Differential Revision: D3967389
fbshipit-source-id: d65c3da
Summary:
- Use the module types in cModule_types.ml instead of redefining them.
- A few occurrences of \n in formatted output replaced by @\n to let the
formatter know of line breaks (by no means complete, these were just a few I
came across while doing something else)
Reviewed By: jberdine
Differential Revision: D3944081
fbshipit-source-id: 4460427
Summary:
Change Sil.Call instruction to have only a single optional return
identifier, insted of a list. Essentially none of the code handled
multiple return identifiers. Also, add the type of the return
identitifier to Call instructions.
Reviewed By: sblackshear
Differential Revision: D3919358
fbshipit-source-id: d2d4f72
Summary:
It is no longer necessary to keep the name of a struct within the
struct, as the name will just have been used to look it up.
Reviewed By: cristianoc
Differential Revision: D3919355
fbshipit-source-id: ab65168
Summary:
This diff removes the redundancy in the representation of types where
struct types could be represented either directly using Tstruct or
indirectly using Tvar to refer to the type environment. A consequence
is that it is much harder to construct large type values.
Reviewed By: sblackshear, cristianoc
Differential Revision: D3839753
fbshipit-source-id: cf04ea5
Summary:
Rename Typ.mk_struct to internal_mk_struct, and add Tenv.mk_struct that
ensures types are added to the environment under the right name.
Reviewed By: cristianoc
Differential Revision: D3791865
fbshipit-source-id: fd4b667
Jules Villard
Dulma Churchill
Josh Berdine
Mehdi Bouaziz
Daiva Naudziuniene
Sam Blackshear
Andrzej Kotulski
Martino Luca
Jia Chen
Cristiano Calcagno