tree 235f9d05c10a0294499af6a654d1619f9228576b
parent 15e731c1b87e17f227fe61e36d90f5e31fedf824
author Joseph Huber <huberjn@outlook.com> 1708624912 -0600
committer Copybara-Service <copybara-worker@google.com> 1708625025 -0800

[Libomptarget] Remove global ctor and use reference counting (#80499)

Summary:
Currently we rely on global constructors to initialize and shut down the
OpenMP runtime library and plugin manager. This causes some issues
because we do not have a defined lifetime that we can rely on to release
and allocate resources. This patch instead adds some simple reference
counted initialization and deinitialization function.

A future patch will use the `deinit` interface to more intelligently
handle plugin deinitilization. Right now we do nothing and rely on
`atexit` inside of the plugins to tear them down. This isn't great
because it limits our ability to control these things.

Note that I made the `__tgt_register_lib` functions do the
initialization instead of adding calls to the new runtime functions in
the linker wrapper. The reason for this is because in the past it's been
easier to not introduce a new function call, since sometimes the user's
compiler will link against an older `libomptarget`. Maybe if we change
the name with offloading in the future we can simplify this.

Depends on https://github.com/llvm/llvm-project/pull/80460

GitOrigin-RevId: ea174c09342275d6c6fec48fb846eaf28fae5b51