[LLVMdev] Removal of GVStub methods from MachineCodeEmitter, ELFWriter, and MachOWriter

[Evan Cheng]

I'll look at these. First scan looks good. Are you able to run some  
tests?

Evan

On Feb 28, 2009, at 9:36 AM, Aaron Gray wrote:

> I have done a possible cleanup patch for the MachineCodeEmitter,  
> ELFWriter, and MachOWriter classes. It removes the two  
> startGVStub(), and finishGVStub() JIT specific methods.
>
> You may remember the following comments :-
>
>     /// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
>
> To get rid of these easily turned out to be a semicomplex  
> modification because of the JITInfo classes dependance on  
> MachineCodeEmitter and the GVStub methods. Also the fact that  
> JITEmitter is hidden and quite a large class in a .cpp file.
>
> At first I did this by introducing a JITCodeEmitter class between  
> MachineCodeEmitter and the (un)hidden JITEmitter. But this lead to  
> more dependancies and they lead on to more.
>
> I have now made class header for JITEmitter putting it in the llvm  
> namespace. There were several other header dependancies as a result  
> and lib/ExecutionEngine/JIT/JIT.h and lib/ExecutionEngine/JIT/ 
> JITDwarfEmitter.h required moving to the include/llvm/ 
> ExecutionEngine/JIT directory as a result to make them visible to  
> JIT.h and dependants.
>
>     * create JITEmitter.h and made class JITEmitter visible in llvm  
> namespace
>     * moved lib/ExecutionEngine/JIT/JIT.h to include/llvm/ 
> ExecutionEngine/JIT
>     * moved lib/ExecutionEngine/JIT/JITDwarfEmitter.h to include/ 
> llvm/ExecutionEngine/JIT
>     * removed JIT specific startGVStub()'s functions and  
> finishGVStub() from MachineCodeEmitter, ELFWriter, and  MachOWriter  
> classes.
>     * modified include/llvm/Target/TargetJITInfo.h to use JITEmitter  
> rather than MachineCodeEmitter.
>     * modified :-
>         - lib/Target/PowerPC/PPCJITInfo.h
>         - lib/Target/PowerPC/PPCJITInfo.cpp
>         - lib/Target/ARM/ARMJITInfo.cpp
>         - lib/Target/ARM/ARMJITInfo.h
>         - lib/Target/Alpha/AlphaJITInfo.cpp
>         - lib/Target/Alpha/AlphaJITInfo.h
>         - lib/Target/X86/X86JITInfo.h
>         - lib/Target/X86/X86JITInfo.cpp
>         to use JITEmitter rather than MachineCodeEmitter.
>     * renamed multiple MCE's to JE's
>     * removed unneed getCodeEmitter()'s in JITEmitter.cpp class JIT.
>     * modified lib/ExecutionEngine/JIT/TargetSelect.cpp to use  
> include/llvm/ExecutionEngine/JIT/JIT.h include file
>     * modified lib/ExecutionEngine/JIT/Intercept.cpp to use include/ 
> llvm/ExecutionEngine/JIT/JIT.h include file
>
> I was wondering whether it would be better to call the JITEmitter  
> class JITCodeEmitter and have JCE's instead of JE's.
>
> I dont think there are any other issues I missed or need tidying up  
> either. I removed some getCodeEmitter and accompanying redundant  
> assertions from JITEmitter.cpp JIT class methods, AFAICT this is  
> only cruft.
>
> Anyway here's the patch :-
>
>     http://www.aarongray.org/LLVM/patches/llvm-JITEmitter.patch
>
> There was another way I considered that was having a second MCE for  
> writting global data and stubs to. I believe this would not require  
> making JITEmitter and friend visible, but may introduce more runtime  
> overhead.
>
> If you could have a look at this patch and see what you think.
>
> If things go well I will be working on patches for the ELFWriter and  
> an accompanying COFFWriter. I know I promised this before but  
> unfortunate circumstances stopped me working on it back then.
>
> Hopefully I can do some ground work and incremental patches to get  
> some code generated then look at the ABI issues on Windows.
>
> Cheers,
>
> Aaron
>
>
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