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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, i...

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

...le compilation flow 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<mailto: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 worki...

...ets the relevant information from the Triple it holds. This information is incorrect, even as a starting point. Please do read the other examples in my previous email. It contains a number of problems that need to be addressed and are completely unrelated to the MC layer. ABI Let's start at ExecuteAssembler() in cc1as_main.cpp. Here's a sketch of what happens: * Call TargetRegistry::lookupTarget() to get a llvm::Target. * Call createMCRegInfo(Triple, ...) * Call createMCAsmInfo(..., Triple) * MipsMCAsmInfo::PointerSize is incorrect for the N32 ABI (should be 4 but gets 8 since it checks for Trip...

...way. I think Matthew is going down the correct path in his email and I've responded there. Thanks! -eric Please do read the other examples in my previous email. It contains a number of problems that need to be addressed and are completely unrelated to the MC layer. ABI Let's start at ExecuteAssembler() in cc1as_main.cpp. Here's a sketch of what happens: * Call TargetRegistry::lookupTarget() to get a llvm::Target. * Call createMCRegInfo(Triple, ...) * Call createMCAsmInfo(..., Triple) * MipsMCAsmInfo::PointerSize is incorrect for the N32 ABI (should be 4 but gets 8 since it checks for Trip...

...way. I think Matthew is going down the correct path in his email and I've responded there. Thanks! -eric Please do read the other examples in my previous email. It contains a number of problems that need to be addressed and are completely unrelated to the MC layer. ABI Let's start at ExecuteAssembler() in cc1as_main.cpp. Here's a sketch of what happens: * Call TargetRegistry::lookupTarget() to get a llvm::Target. * Call createMCRegInfo(Triple, ...) * Call createMCAsmInfo(..., Triple) * MipsMCAsmInfo::PointerSize is incorrect for the N32 ABI (should be 4 but gets 8 since it checks for Trip...

...way. I think Matthew is going down the correct path in his email and I've responded there. Thanks! -eric Please do read the other examples in my previous email. It contains a number of problems that need to be addressed and are completely unrelated to the MC layer. ABI Let's start at ExecuteAssembler() in cc1as_main.cpp. Here's a sketch of what happens: * Call TargetRegistry::lookupTarget() to get a llvm::Target. * Call createMCRegInfo(Triple, ...) * Call createMCAsmInfo(..., Triple) * MipsMCAsmInfo::PointerSize is incorrect for the N32 ABI (should be 4 but gets 8 since it checks for Trip...

> OK, I'm going to just reply to the last because I think it's the most important part of all this and would like to try to have us side tracked again. If you'd like I can reply to it, but let's take the last part first :) > > > > Could you please provide some examples of things that are impossible right now > > > with command lines, how those interact with