llvm-project

5af3fa81 - [Offload][OpenMP] Support shadow-pointer tracking for Fortran descriptors. (#158370)

[Offload][OpenMP] Support shadow-pointer tracking for Fortran descriptors. (#158370) This change adds support for saving full contents of attached Fortran descriptors, and not just their pointee address, in the shadow-pointer table. With this, we now support: * comparing full contents of descriptors to check whether a previous shadow-pointer entry is stale; * restoring the full contents of descriptors And with that, we can now use ATTACH map-types (added in #149036) for mapping Fortran pointer/allocatable arrays, and array-sections on them. e.g.: ```f90 integer, allocatable :: x(:) !$omp target enter data map(to: x(:)) ``` as: ``` void* addr_of_pointee = allocated(x) ? &x(1) : nullptr; int64_t sizeof_pointee = allocated(x) ? sizeof(x(:)) : 0 addr_of_pointee, addr_of_pointee, sizeof_pointee, TO addr_of_descriptor, addr_of_pointee, size_of_descriptor, ATTACH ```