Summary:
This diff fixes incorrect order of statements on assignments.
In the translation of `LHS=RHS;`, if `RHS` is a complicated expression that introduced new nodes, eg a conditional expression, some load statements for `LHS` came after its usage. To avoid the issue, this diff forces it to introduce new nodes for `LHS`.
Reviewed By: jvillard
Differential Revision: D26099782
fbshipit-source-id: 27417cd99
Summary: This diff adds an additional parameter of struct return type in ObjC's methods. The additional parameter had been supported only in C/C++ functions/methods for 5 years (D2865091 (ec80d40bdd)). If there is no specific reason not to do that, let's do it and fix the incorrect frontend translations.
Reviewed By: jvillard
Differential Revision: D26049748
fbshipit-source-id: 414b3011f
Summary:
When there was an assignment of C struct, `x = y;`, it was translated to the statements of load and store.
```
n$0 = *y
*x = n$0
```
However, this is incorrect in Sil, because a struct is not a value that can be assigned to registers. This diff fixes the translation as assignments of each field values :
```
n$0 = *y.field1
*x.field1 = n$0
n$0 = *y.field2
*x.field2 = n$0
...
```
It copies field values of C structs on:
* assign statement
* return statement
* declarations.
It supports nested structs.
Reviewed By: jvillard
Differential Revision: D25952894
fbshipit-source-id: 355f8db9c
Summary:
This diff fixes a bug in the translation of an empty for-loop. When both initialization and
incrementation statements did not introduce a new node, the frontend generated an incorrect results
where the for-loop was unreachable from the entry node.
Fixes https://github.com/facebook/infer/issues/1374
Reviewed By: jvillard
Differential Revision: D25912142
fbshipit-source-id: 15b65cb84
Summary:
When the body of the loop doesn't created a node then they don't get
wired correctly to the rest of the loop and end up dangling. Force node
creation to fix that.
Fixes https://github.com/facebook/infer/issues/1373
Reviewed By: ezgicicek
Differential Revision: D25804185
fbshipit-source-id: 85108bdd9
Summary:
We need to make sure a node is created to avoid instructions appearing
in the wrong order in the final CFG.
Reviewed By: da319
Differential Revision: D25784405
fbshipit-source-id: 3ef27d712
Summary:
In `Config`, the lists generated by `mk_string_list`, `mk_path_list`, `mk_rest_actions` are reversed implicitly, which made it hard for developers to use them correctly. What the previous and this diff will do is to change the list variables of the `Config` to not-reversed one.
* diff1: First diff adds `RevList` to distinguish reversed lists explicitly. All usages of the reversed list should be changed to use `RevList`'s lib calls.
* diff2: Then this diff will change types of `Config` variables to not-reversed, normal list.
Reviewed By: ngorogiannis
Differential Revision: D25562303
fbshipit-source-id: 4cbc6d234
Summary:
In `Config`, the lists generated by `mk_string_list`, `mk_path_list`, `mk_rest_actions` are reversed implicitly, which made it hard for developers to use them correctly. What this and the next diff will do is to change the list variables of the `Config` to not-reversed one.
* diff1: First this diff adds `RevList` to distinguish reversed lists explicitly. All usages of the reversed list should be changed to use `RevList`'s lib calls.
* diff2: Then the next diff will change types of `Config` variables to not-reversed, normal list.
Reviewed By: ngorogiannis
Differential Revision: D25562297
fbshipit-source-id: b96622336
Summary:
The frontend of ObjC regarding to captured variable was incorrect: it set capturing mode as
by-reference always, but it actually translaged as if all captured variables were passed with
by-value. This diff fixes this based on the document.
https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Blocks/Articles/bxVariables.html
* global variable: by reference
* local variable: by value
* `static` local variable: by reference
* `__block` local variable: by reference
* parameter: by value
Reviewed By: jvillard
Differential Revision: D25306122
fbshipit-source-id: ec499d705
Summary:
This diff uses Pvar.t in CapturedVar.t, so that
* it can include additional info in Pvar.t
* it can avoid some `Pvar.mk` calls when using the captured variables
Reviewed By: jvillard
Differential Revision: D25331763
fbshipit-source-id: 4e0c2ab4a
Summary:
A minor but persistent annoyance: named argument of a non-ambiguous type
of almost the same name. No.
Reviewed By: skcho
Differential Revision: D24991673
fbshipit-source-id: c806f9cec
Summary:
This was left as a TODO before: where to place calls to destructors for
C++ temporaries that are only conditionally creating when evaluating an
expression. This can happen inside the branches of a conditional
operation `b?e:f` or in potentially-short-circuited conditions on the
righ-hand side of `&&` and `||` operators.
Following the compilation scheme of clang (observed by looking at the
generated LLVM bitcode), we instrument the program with "marker"
variables, so that for instance `X x = true?X():y;` becomes (following
the execution on the true branch):
```
marker1 = 0; // initialize all markers to 0
PRUNE(true) // entering true branch
X::X(&temporary); // create temporary...
marker1 = 1; // ...triggers setting its marker to 1
X::X(&x, &temporary); // finish expression
if (marker1) {
X::~X(&temporary); // conditionally destroy the temporary
}
```
In this diff, you'll find code for:
- associating markers to temporaries that need them
- code to initialize markers to 0 before full-expressions
- code to conditionally destroy temporaries based on the values of the
markers once the full-expression has finished evaluating
Reviewed By: da319
Differential Revision: D24954070
fbshipit-source-id: cf15df7f7
Summary:
The translation of `switch` cases needs to insert nodes around the
translation of each `case` sub-statement, so we need to force node
creation in these sub-statements so the nodes around it can be connected
to the translation of the sub-statements.
Also added more logging I found useful when debugging that.
Reviewed By: da319
Differential Revision: D24991455
fbshipit-source-id: d3a622142
Summary:
Split the translation of return more aggressively between:
1. the instruction that has to happen before the translation of the sub-expr
2. the sub-expr
3. the instruction that has to happen after the sub-expr
This is needed for the next diff which creates potentially large CFGs in
(2).
Reviewed By: da319
Differential Revision: D24954071
fbshipit-source-id: a7e7e2527
Summary:
In the next diff we need to know when a destructor is needed for sure
before calling some of these auxiliary methods.
Reviewed By: da319
Differential Revision: D24832078
fbshipit-source-id: 6d4e17de2
Summary:
This is several inter-connected changes together to keep the tests
happy.
The ConditionalOperator `b?t:e` is translated by first creating a
placeholder variable to temporarily store the result of the evaluation
in each branch, then the real thing we want to assign to reads that
variable. But, there are situations where that changes the semantics of
the expression, namely when the value created is a struct on the stack
(eg, a C++ temporary). This is because in SIL we cannot assign the
*address* of a program variable, only its contents, so by the time we're
out of the conditional operator we cannot set the struct value
correctly anymore: we can only set its content, which we did, but that
results in a "shifted" struct value that is one dereference away from
where it should be.
So a batch of changes concern `conditionalOperator_trans`:
- instead of systematically creating a temporary for the conditional,
use the `trans_state.var_exp_typ` provided from above if available
when translating `ConditionalOperator`
- don't even set anything if that variable was already initialized by
merely translating the branch expression, eg when it's a constructor
- fix long-standing TODO to propagate these initialization facts
accurately for ConditionalOperator (used by `init_expr_trans` to also
figure out if it should insert a store to the variable being
initialised or not)
The rest of the changes adapt some relevant other constructs to deal
with conditionalOperator properly now that it can set the current
variable itself, instead of storing stuff inside a temp variable. This
change was a problem because some constructs, eg a variable declaration,
will insert nodes that set up the variable before calling its
initialization, and now the initialization happens *before* that setup,
in the translation of the inner conditional operator, which naturally
creates nodes above the current one.
- add a generic helper to force a sequential order between two
translation results, forcing node creation if necessary
- use that in `init_expr_trans` and `cxxNewExpr_trans`
- adjust many places where `var_exp_typ` was incorrectly not reset when translating sub-expressions
The sequentiality business creates more nodes when used, and the
conditionalOperator business uses fewer temporary variables, so the
frontend results change quite a bit.
Note that biabduction tests were invaluable in debugging this. There
could be other constructs to adjust similarly to cxxNewExpr that were
not covered by the tests though.
Added tests in pulse that exercises the previous bug.
Reviewed By: da319
Differential Revision: D24796282
fbshipit-source-id: 0790c8d17
Summary:
- log trans_state for each instruction
- create boxes to indent logs
- hunt down "@." that would prematurely close the boxes
- improve messages
Reviewed By: ngorogiannis
Differential Revision: D24794798
fbshipit-source-id: 80d51a8c5
Summary:
:
New flag (equivalent to --clang-biniou-file) to pass in AST to
frontend.
Passing in json files has the big advantage of emitting line numbers
on frontend AST errors.
Reviewed By: jvillard
Differential Revision: D23814358
fbshipit-source-id: 0ad0452ff
Summary: Cleanup `Typ` by moving all constant types to `StdTyp`. Also remove `Typ.typ` as it's just `Typ.t` now.
Reviewed By: jberdine
Differential Revision: D24620397
fbshipit-source-id: 4764f87ef
Summary:
This diff revises the translation of message expression's arguments in ObjC frontend. In the
frontend, it massages the arguments when calling a static method, so the class or object value is
not given to the static method as the first parameter.
The problem is that it used a raise-exception-and-catch way to detect where we remove the first
parameter. This way of using an exception is not only hard to understand, but also incorrectly
removed the first parameter, with breaking abstract semantics sometimes. (See the added test.) This diff
avoids using the exception.
Reviewed By: jvillard
Differential Revision: D24565513
fbshipit-source-id: 0a84ca394
Summary: This will be needed in the next diff so that we can find all classes that conform to `NSCopying` protocol.
Reviewed By: skcho
Differential Revision: D24216549
fbshipit-source-id: 297b527a6
Summary:
This diff keeps closure parameters in closure-specializated procedures.
What the closure-specialization is doing is a propagation of concrete closures. For example, it
translates:
```
foo(block b) {
b();
}
goo() {
foo(^{...});
}
```
to
```
foo_new() {
(^{...})();
}
goo() {
foo_new();
}
```
However, if `foo` addresses `b` as a normal value like
```
foo(block b) {
block c = b;
}
```
this is translated to
```
foo_new() {
block c = b;
}
```
Note that the closure parameter of `foo` is removed, thus `b` becomes a free variable. Not good.
To avoid the situation, this diff keeps the closure parameters intact.
Reviewed By: da319
Differential Revision: D23905580
fbshipit-source-id: 014989fbf
Summary:
This diff substitutes closure parameter when it is given via variable. For example,
```
x = ^{ ... }
foo(x)
```
this diff substitutes the closure variable `x`,
```
x = ^{ ... }
foo(^{ ... })
```
so that the specialization of `foo` can be done by `CCallSpecializaedWithClosures.process`.
Reviewed By: jvillard
Differential Revision: D23814595
fbshipit-source-id: a89f1530f
Summary:
Upgrade to latest clang release, needed for xcode12.
clang-8/9 won't be able to read the Xcode 12 SDK since there's annotations that will fail compilation.
Also removing unused (and hard to compile) binary `ast_exporter_bin` from facebook-clang-plugins/libtooling.
Reviewed By: ngorogiannis
Differential Revision: D23780089
fbshipit-source-id: 2314125a9
Summary:
`WithBlockParameters` is generated by a pre-analysis to express concrete block parameters. However,
before this diff, the block parameters only have names, which is insufficient to find their
summaries. This diff change `WithBlockParameters` to have `Block.t` that includes the parameters of
the block, so we can find blocks' summaries.
Reviewed By: ezgicicek
Differential Revision: D23785148
fbshipit-source-id: 9034f4f8d
Summary:
This diff increases autoreleasepool size when
* caller is non-ARC-compiled
* callee is ARC-compiled
* return type is a pointer to objc object
To distinguish non-ARC-/ARC-compiled:
* extended `translation_unit_decl_info` to have a boolean field `is_objc_arc_on`
* then copied it to `ProcAttributes.t` for each procedures.
Reviewed By: ezgicicek
Differential Revision: D23565003
fbshipit-source-id: dee22ea82
Summary: Structs captured both by reference or by value should have reference in their type. Struct captured by value should first call copy constructor. In this diff we fix the type of the captured variable to include reference. Copy constructor injection is left for the future.
Reviewed By: jvillard
Differential Revision: D23688713
fbshipit-source-id: d13748b5d
Summary: Variables captured without initialization do not have correct type inside lambda's body. This diff sets the correct type of captured reference variables inside procdesc and makes sure the translation of captured variables is correct. The translation of lambda's body will then take into account the type of captured var from procdesc.
Reviewed By: jvillard
Differential Revision: D23678371
fbshipit-source-id: ed16dc978
Summary: Add missing reference to the type of variable captured by reference without initialization.
Reviewed By: jvillard
Differential Revision: D23567685
fbshipit-source-id: b4e2ac0b6
Summary: Variables captured by reference without initialization are missing dereference in their type inside lambda's body. This causes the translation to miss one dereference. To fix this, we want to add missing reference to the type. However, we first need to make sure that lambdas body is translated after the translation of captured variables.
Reviewed By: jvillard
Differential Revision: D23564099
fbshipit-source-id: 6a2ae053d
Summary:
Added a function to check if a method is a cpp lambda call operator that will be used in later diffs
#skipdeadcode
Reviewed By: jvillard
Differential Revision: D23564089
fbshipit-source-id: 144c3d735
Summary:
We were missing assignment to captured variables with initializers.
Consider the following example:
```
S* update_inside_lambda_capture_and_init(S* s) {
S* object = nullptr;
auto f = [& o = object](S* s) { o = s; };
f(s);
return object;
}
```
which was translated to
```
VARIABLE_DECLARED(o:S*&);
*&o:S*&=&object
*&f =(_fun...lambda..._operator(),([by ref]&o &o:S*&))
```
However, we want to capture `o` (which is an address of `object`), rather `&o` in closure.
After the diff
```
VARIABLE_DECLARED(o:S*&);
*&o:S*&=&object
n$7=*&o:S*&
*&f =(_fun...lambda..._operator(),([by ref]n$7 &o:S*&))
```
Reviewed By: jvillard
Differential Revision: D23567346
fbshipit-source-id: 20f77acc2
Summary:
This diff adds a new experimental checker for detecting size of objects in autorelease pool in ObjC. The basic mechanism is almost the same with the previous cost calculation:
* Autorelease pool size is increased at explicit `autorelease` call
* Autorelease pool size is set as zero by the `autoreleasepool` block.
While it only supports the explicit calls as of now, we will extend the checker to handle more cases in the following diffs.
Reviewed By: ezgicicek
Differential Revision: D23473145
fbshipit-source-id: 416488176
Summary:
This diff adds translation of `dictionaryWithObjects:forKeys:count:`. In the previous implementation it was
translated as if it was `dictionaryWtihObjectsAndKeys:`, but their function parameters are different.
In this diff, it translates an array literal `NSDictionary* a = @ [ @"firstName": @"Foo", @"lastName":@"Bar" ];` to
```
n$1=NSString.stringWithUTF8:(@"firstName")
n$2=NSNumber.stringWithUTF8:(@"Foo")
n$3=NSNumber.stringWithUTF8:(@"lastName")
n$4=NSNumber.stringWithUTF8:(@"Bar")
temp1[0]:objc_object*=n$1
temp1[1]:objc_object*=n$3
temp2[0]:objc_object*=n$2
temp2[1]:objc_object*=n$4
n$3=NSDictionary.dictionaryWithObjects:forKeys:count:(temp2:objc_object* const [2*8], temp1:objc_object*const [2*8], 2:int)
```
where `temp` is an additional local variable declared as array.
See,
https://developer.apple.com/documentation/foundation/nsdictionary/1574184-dictionarywithobjects?language=objchttps://developer.apple.com/documentation/foundation/nsdictionary/1574181-dictionarywithobjectsandkeys
{F316854542}
Reviewed By: skcho
Differential Revision: D23447042
fbshipit-source-id: 14b7c3f2b
Summary:
This diff finishes the migration from the specialization of methods that take blocks as arguments. Here we delete all the old code and change the way we model dispatch functions so that the tests pass.
- Remove the code for specializing the methods in biabduction.
- Remove the call flags `cf_with_block_parameters` that was only used in this algorithm.
- Removes models for dispatch functions.
- Adds models for dispatch functions as program transformation only in biabduction. To be added in other checkers in the future.
Reviewed By: ngorogiannis
Differential Revision: D23345342
fbshipit-source-id: b5e8542ce
Summary:
This preanalysis in general aims to create specialized clones of methods that have blocks as arguments and that are called with concrete closures, and then call these clone methods instead of the original ones.
One complication is what happens with the captured variables in the closure. What we do is we add them to the formals of the cloned method and passed them through to the concrete blocks.
We do this transformation in two steps:
1. Go through all the callers of methods with blocks as parameters, and create the clone methods. In this preanalysis we only create the attributes for the new method, not the code. We also update the call instructions in the callers to represent a call to the cloned method with updated arguments: we don't need to pass closures arguments anymore, we instead pass the captured variables as new arguments.
2. We add the corresponding code to the newly created clones: this means swapping the call to the block variable with a call to the corresponding block. Moreover, we add some of the new formals (that correspond to the captured variables) to the arguments of the call.
This diff implements step 1 of the analysis. The next diff D23216021 implements step 2.
Reviewed By: ngorogiannis
Differential Revision: D23109204
fbshipit-source-id: 91a5eb16b
Summary:
There was a syntax error in the comment as `[code]` is interpreted as
code but backticks were used instead. This made `ocamlformat` produce a
warning but no error.
Reviewed By: skcho
Differential Revision: D23167273
fbshipit-source-id: a7fad10d5
Sungkeun Cho
Jules Villard
Martin Trojer
Ezgi Çiçek
Nikos Gorogiannis
Daiva Naudziuniene
Qianyi Shu
Dulma Churchill