[PATCH] D141036: [JITLink] Add an initial implementation of JITLink for ELF/LoongArch

[wanglei via Phabricator via llvm-commits]

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This implementation supports basic relocation types and adds EHFrame,
Got/Plt handling passes.
This patch also enables JIT support for LoongArch64.

With this patch, I successfully run hello.ll and simple_throw.ll
(which is generated from test-suite/SingleSource/Regression/C++/EH/simple_throw.cpp)
using the `lli` command with options `--jit-kind=orc --jit-linker=jitlink`.

Note: `hasJIT` property of LoongArch32 remains false as there is no
validation environment.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141036

Files:
  llvm/include/llvm/ExecutionEngine/JITLink/ELF_loongarch.h
  llvm/include/llvm/ExecutionEngine/JITLink/loongarch.h
  llvm/lib/ExecutionEngine/JITLink/CMakeLists.txt
  llvm/lib/ExecutionEngine/JITLink/ELF.cpp
  llvm/lib/ExecutionEngine/JITLink/ELF_loongarch.cpp
  llvm/lib/ExecutionEngine/JITLink/loongarch.cpp
  llvm/lib/Target/LoongArch/TargetInfo/LoongArchTargetInfo.cpp
  llvm/test/ExecutionEngine/JITLink/LoongArch/ELF_loongarch32_ehframe.s
  llvm/test/ExecutionEngine/JITLink/LoongArch/ELF_loongarch32_relocations.s
  llvm/test/ExecutionEngine/JITLink/LoongArch/ELF_loongarch64_ehframe.s
  llvm/test/ExecutionEngine/JITLink/LoongArch/ELF_loongarch64_relocations.s
  llvm/test/ExecutionEngine/JITLink/LoongArch/lit.local.cfg

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