In GenCall, fix the IR gen for C++ method calls as under MSVC as the
calling conventions for free functions and C++ methods can be
different. This also fixes the missing inreg (on sret arguments)
issues on Windows ARM64. Also refactor to use CGFunctionInfo
returnInfo isSretAfterThis to detect when to reorder the sret and the
this arguments under MSVC.
In ClagImporter, don't drop the return type for the compound
assignment operators such as operator+= when the return value is a
reference so that the CGFunctionInfo will be correctly indicate an
indirect return for the compound assignment operators.
This corrects the name decoration and splits the windows and itanium
decoration schemes. This allows us to un-XFAIL some of the interop
tests on Windows while repairing the failures identified on rebranch.
This does not include subscript operators.
Before this is re-enabled operators need to be re-implemented. Right now they are the source of a lot of bugs. They cause frequent crashes and mis compiles. Also, templated operators insert a lot of names into global lookup which causes problems.
They also don't work on Windows.
This builds on top of the work of Egor Zhdan. It implements
`T operator[]` and does so largely by taking a path very much like the
`const T &operator[]` path.
This change adds support for calling `operator()` from Swift code.
As the C++ interop manifesto describes, `operator()` is imported into Swift as `callAsFunction`.
Adding integers is a commutative operation meaning the old tests would
fail to detect an error if the arguments were passed in the wrong order.
Testing inline member operators using subtraction ensures that arguments
are passed in the correct order.
This adds support to `ClangImporter` to import C++ member function operators as static methods into Swift, which is part of SR-12748.
The left-hand-side operand, which gets passed as the `this` pointer to the C++ function is represented as an additional first parameter in the Swift method. It gets mapped back in SILGen.
Two of the tests are disabled on Windows because we can't yet call member functions correctly on Windows (SR-13129).
