This patch overhauls the `libomptarget` and plugin interface. Currently, we define a C API and compile each plugin as a separate shared library. Then, `libomptarget` loads these API functions and forwards its internal calls to them. This was originally designed to allow multiple implementations of a library to be live. However, since then no one has used this functionality and it prevents us from using much nicer interfaces. If the old behavior is desired it should instead be implemented as a separate plugin. This patch replaces the `PluginAdaptorTy` interface with the `GenericPluginTy` that is used by the plugins. Each plugin exports a `createPlugin_<name>` function that is used to get the specific implementation. This code is now shared with `libomptarget`. There are some notable improvements to this. 1. Massively improved lifetimes of life runtime objects 2. The plugins can use a C++ interface 3. Global state does not need to be duplicated for each plugin + libomptarget 4. Easier to use and add features and improve error handling 5. Less function call overhead / Improved LTO performance. Additional changes in this plugin are related to contending with the fact that state is now shared. Initialization and deinitialization is now handled correctly and in phase with the underlying runtime, allowing us to actually know when something is getting deallocated. Depends on https://github.com/llvm/llvm-project/pull/86971 https://github.com/llvm/llvm-project/pull/86875 https://github.com/llvm/llvm-project/pull/86868
Caused failures on build-bots, reverting to investigate. This reverts commit 80f9e814ec896fdc57ee84afad8ac4cb1f8e4627.
This patch overhauls the `libomptarget` and plugin interface. Currently, we define a C API and compile each plugin as a separate shared library. Then, `libomptarget` loads these API functions and forwards its internal calls to them. This was originally designed to allow multiple implementations of a library to be live. However, since then no one has used this functionality and it prevents us from using much nicer interfaces. If the old behavior is desired it should instead be implemented as a separate plugin. This patch replaces the `PluginAdaptorTy` interface with the `GenericPluginTy` that is used by the plugins. Each plugin exports a `createPlugin_<name>` function that is used to get the specific implementation. This code is now shared with `libomptarget`. There are some notable improvements to this. 1. Massively improved lifetimes of life runtime objects 2. The plugins can use a C++ interface 3. Global state does not need to be duplicated for each plugin + libomptarget 4. Easier to use and add features and improve error handling 5. Less function call overhead / Improved LTO performance. Additional changes in this plugin are related to contending with the fact that state is now shared. Initialization and deinitialization is now handled correctly and in phase with the underlying runtime, allowing us to actually know when something is getting deallocated. Depends on https://github.com/llvm/llvm-project/pull/86971 https://github.com/llvm/llvm-project/pull/86875 https://github.com/llvm/llvm-project/pull/86868
Summary: This gets the target's corresponding ELF value from the preprocessor. We use this to detect if a given ELF is compatible with the CPU offloading impolementation for OpenMP. Previously we used defitions from CMake, but this is easier for people to understand as there may be new users of this in the future.
In a nutshell, this moves our libomptarget code to populate the offload subproject. With this commit, users need to enable the new LLVM/Offload subproject as a runtime in their cmake configuration. No further changes are expected for downstream code. Tests and other components still depend on OpenMP and have also not been renamed. The results below are for a build in which OpenMP and Offload are enabled runtimes. In addition to the pure `git mv`, we needed to adjust some CMake files. Nothing is intended to change semantics. ``` ninja check-offload ``` Works with the X86 and AMDGPU offload tests ``` ninja check-openmp ``` Still works but doesn't build offload tests anymore. ``` ls install/lib ``` Shows all expected libraries, incl. - `libomptarget.devicertl.a` - `libomptarget-nvptx-sm_90.bc` - `libomptarget.rtl.amdgpu.so` -> `libomptarget.rtl.amdgpu.so.18git` - `libomptarget.so` -> `libomptarget.so.18git` Fixes: https://github.com/llvm/llvm-project/issues/75124 --------- Co-authored-by: Saiyedul Islam <Saiyedul.Islam@amd.com>