[clang] static operators should evaluate object argument (reland) (#80108)

This re-applies 30155fc0 with a fix for clangd.

### Description

clang don't evaluate the object argument of `static o

[clang] static operators should evaluate object argument (reland) (#80108)

This re-applies 30155fc0 with a fix for clangd.

### Description

clang don't evaluate the object argument of `static operator()` and
`static operator[]` currently, for example:

```cpp
#include <iostream>

struct Foo {
static int operator()(int x, int y) {
std::cout << "Foo::operator()" << std::endl;
return x + y;
}
static int operator[](int x, int y) {
std::cout << "Foo::operator[]" << std::endl;
return x + y;
}
};
Foo getFoo() {
std::cout << "getFoo()" << std::endl;
return {};
}
int main() {
std::cout << getFoo()(1, 2) << std::endl;
std::cout << getFoo()[1, 2] << std::endl;
}
```

`getFoo()` is expected to be called, but clang don't call it currently
(17.0.6). This PR fixes this issue.

Fixes #67976, reland #68485.

### Walkthrough

- **clang/lib/Sema/SemaOverload.cpp**
- **`Sema::CreateOverloadedArraySubscriptExpr` &
`Sema::BuildCallToObjectOfClassType`**
Previously clang generate `CallExpr` for static operators, ignoring the
object argument. In this PR `CXXOperatorCallExpr` is generated for
static operators instead, with the object argument as the first
argument.
- **`TryObjectArgumentInitialization`**
`const` / `volatile` objects are allowed for static methods, so that we
can call static operators on them.
- **clang/lib/CodeGen/CGExpr.cpp**
- **`CodeGenFunction::EmitCall`**
CodeGen changes for `CXXOperatorCallExpr` with static operators: emit
and ignore the object argument first, then emit the operator call.
- **clang/lib/AST/ExprConstant.cpp**
- **`‎ExprEvaluatorBase::handleCallExpr‎`**
Evaluation of static operators in constexpr also need some small changes
to work, so that the arguments won't be out of position.
- **clang/lib/Sema/SemaChecking.cpp**
- **`Sema::CheckFunctionCall`**
Code for argument checking also need to be modify, or it will fail the
test `clang/test/SemaCXX/overloaded-operator-decl.cpp`.
- **clang-tools-extra/clangd/InlayHints.cpp**
- **`InlayHintVisitor::VisitCallExpr`**
Now that the `CXXOperatorCallExpr` for static operators also have object
argument, we should also take care of this situation in clangd.

### Tests

- **Added:**
- **clang/test/AST/ast-dump-static-operators.cpp**
Verify the AST generated for static operators.
- **clang/test/SemaCXX/cxx2b-static-operator.cpp**
Static operators should be able to be called on const / volatile
objects.
- **Modified:**
- **clang/test/CodeGenCXX/cxx2b-static-call-operator.cpp**
- **clang/test/CodeGenCXX/cxx2b-static-subscript-operator.cpp**
Matching the new CodeGen.

### Documentation

- **clang/docs/ReleaseNotes.rst**
Update release notes.

---------

Co-authored-by: Shafik Yaghmour <shafik@users.noreply.github.com>
Co-authored-by: cor3ntin <corentinjabot@gmail.com>
Co-authored-by: Aaron Ballman <aaron@aaronballman.com>

show more ...

Revert "[clang] static operators should evaluate object argument (#68485)"

This reverts commit 30155fc0ef4fbdce2d79434aaae8d58b2fabb20a.

It seems to have broken some tests in clangd:
http://45.33.8

Revert "[clang] static operators should evaluate object argument (#68485)"

This reverts commit 30155fc0ef4fbdce2d79434aaae8d58b2fabb20a.

It seems to have broken some tests in clangd:
http://45.33.8.238/linux/129484/step_9.txt

show more ...

[clang] static operators should evaluate object argument (#68485)

### Description

clang don't evaluate the object argument of `static operator()` and
`static operator[]` currently, for example:

[clang] static operators should evaluate object argument (#68485)

### Description

clang don't evaluate the object argument of `static operator()` and
`static operator[]` currently, for example:

```cpp
#include <iostream>

struct Foo {
static int operator()(int x, int y) {
std::cout << "Foo::operator()" << std::endl;
return x + y;
}
static int operator[](int x, int y) {
std::cout << "Foo::operator[]" << std::endl;
return x + y;
}
};
Foo getFoo() {
std::cout << "getFoo()" << std::endl;
return {};
}
int main() {
std::cout << getFoo()(1, 2) << std::endl;
std::cout << getFoo()[1, 2] << std::endl;
}
```

`getFoo()` is expected to be called, but clang don't call it currently
(17.0.2). This PR fixes this issue.

Fixes #67976.

### Walkthrough

- **clang/lib/Sema/SemaOverload.cpp**
- **`Sema::CreateOverloadedArraySubscriptExpr` &
`Sema::BuildCallToObjectOfClassType`**
Previously clang generate `CallExpr` for static operators, ignoring the
object argument. In this PR `CXXOperatorCallExpr` is generated for
static operators instead, with the object argument as the first
argument.
- **`TryObjectArgumentInitialization`**
`const` / `volatile` objects are allowed for static methods, so that we
can call static operators on them.
- **clang/lib/CodeGen/CGExpr.cpp**
- **`CodeGenFunction::EmitCall`**
CodeGen changes for `CXXOperatorCallExpr` with static operators: emit
and ignore the object argument first, then emit the operator call.
- **clang/lib/AST/ExprConstant.cpp**
- **`‎ExprEvaluatorBase::handleCallExpr‎`**
Evaluation of static operators in constexpr also need some small changes
to work, so that the arguments won't be out of position.
- **clang/lib/Sema/SemaChecking.cpp**
- **`Sema::CheckFunctionCall`**
Code for argument checking also need to be modify, or it will fail the
test `clang/test/SemaCXX/overloaded-operator-decl.cpp`.

### Tests

- **Added:**
- **clang/test/AST/ast-dump-static-operators.cpp**
Verify the AST generated for static operators.
- **clang/test/SemaCXX/cxx2b-static-operator.cpp**
Static operators should be able to be called on const / volatile
objects.
- **Modified:**
- **clang/test/CodeGenCXX/cxx2b-static-call-operator.cpp**
- **clang/test/CodeGenCXX/cxx2b-static-subscript-operator.cpp**
Matching the new CodeGen.

### Documentation

- **clang/docs/ReleaseNotes.rst**
Update release notes.

---------

Co-authored-by: Shafik Yaghmour <shafik@users.noreply.github.com>
Co-authored-by: cor3ntin <corentinjabot@gmail.com>
Co-authored-by: Aaron Ballman <aaron@aaronballman.com>

show more ...

[clang] Use -std=c++23 instead of -std=c++2b

During the ISO C++ Committee meeting plenary session the C++23 Standard
has been voted as technical complete.

This updates the reference to c++2b to c++

[clang] Use -std=c++23 instead of -std=c++2b

During the ISO C++ Committee meeting plenary session the C++23 Standard
has been voted as technical complete.

This updates the reference to c++2b to c++23 and updates the __cplusplus
macro.

Drive-by fixes c++1z -> c++17 and c++2a -> c++20 when seen.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D149553

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[Clang] Implement static operator[]

After accepted in Kona, update the code to accept static operator[] as well.

No big code changes: accept this operator as static in SemaDeclCXX, update AST call

[Clang] Implement static operator[]

After accepted in Kona, update the code to accept static operator[] as well.

No big code changes: accept this operator as static in SemaDeclCXX, update AST call generation in SemaOverload and update feature macros + tests accordingly.

Reviewed By: cor3ntin, erichkeane, #clang-language-wg

Differential Revision: https://reviews.llvm.org/D138387

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