[PATCH] D72624: [WIP] TargetMachine Hook for Module Metadata

[Sam Elliott via Phabricator via cfe-commits]

lenary created this revision.
lenary added reviewers: tejohnson, dblaikie, khchen, dsanders, echristo.
Herald added subscribers: llvm-commits, lldb-commits, cfe-commits, liufengdb, herhut, lucyrfox, mgester, arpith-jacob, csigg, nicolasvasilache, antiagainst, shauheen, burmako, jpienaar, rriddle, mehdi_amini, dang, dexonsmith, steven_wu, hiraditya.
Herald added projects: clang, LLDB, LLVM.

This patch attempts to add a target-overridable hook for allowing module metadata
to override TargetMachine options, especially during LTO.

The new hook is called `TargetMachine::resetTargetDefaultOptions` and takes the
`llvm::Module` so that the module metadata can be read with the API provided
by `llvm::Module`.

It is not clear that this patch handles LTO correctly at the moment.

This patch relates to D72245 <https://reviews.llvm.org/D72245> and D72246 <https://reviews.llvm.org/D72246> and the discussion in
http://lists.llvm.org/pipermail/llvm-dev/2020-January/138151.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72624

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  clang/tools/clang-fuzzer/handle-llvm/handle_llvm.cpp
  lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptExpressionOpts.cpp
  llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl08.rst
  llvm/examples/Kaleidoscope/Chapter8/toy.cpp
  llvm/include/llvm/Target/TargetMachine.h
  llvm/lib/LTO/LTOCodeGenerator.cpp
  llvm/lib/Target/TargetMachine.cpp
  llvm/lib/Target/TargetMachineC.cpp
  llvm/tools/llc/llc.cpp
  llvm/tools/llvm-isel-fuzzer/llvm-isel-fuzzer.cpp
  llvm/tools/llvm-opt-fuzzer/llvm-opt-fuzzer.cpp
  llvm/tools/opt/opt.cpp
  mlir/lib/Conversion/GPUToCUDA/ConvertKernelFuncToCubin.cpp
  mlir/lib/ExecutionEngine/ExecutionEngine.cpp

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