[llvm-dev] Assembly file compilation flow

[Craig Topper via llvm-dev]

Passing an assembly file to clang does not go through any CodeGen phases.
It operates entirely in the MC layer. No MachineFunctions will be created.
It just runs it through the MCAsmParser. Most of the setup for this is in
clang's tools/driver/cc1as_main.cpp in the function ExecuteAssembler


~Craig


On Thu, May 10, 2018 at 1:32 PM Soham Sinha via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello,
>
> LLVM MC blog post
> <http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html> explains
> fairly well how the backend MC project is working. However, it's not clear
> to me how LLVM converts an assembly file (.s) to an object file. The driver
> --verbose option is not giving me much information as well. I want to know
> the flow. Like, What CodeGen phases does this file pass through? Is it
> converted to MachineFunction ever? Where does it hook into the backend
> infrastructure? Any documentation could also be helpful.
>
> Regards,
> Soham Sinha
> PhD Student, Department of Computer Science
> Boston University
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> llvm-dev at lists.llvm.org
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