[LLVMdev] llvmc for PIC16

[Sanjiv Gupta]

I think the correct command line is
$ make LLVMC_BUILTIN_PLUGINS=MyPlugin LLVMC_BASED_DRIVER_NAME=mydriver

rather than
$ make BUILTIN_PLUGINS=MyPlugin DRIVER_NAME=mydriver
(I found the later one in LLVMC-Reference)

- Sanjiv

Sanjiv Gupta wrote:
> Mikhail Glushenkov wrote:
>>
>> Hi Sanjiv,
>>
>> Sanjiv Gupta <sanjiv.gupta <at> microchip.com> writes:
>>
>> > The salient features that we want to have in the driver are:
>> > [...]
>>
>> As promised, I've implemented a basic compiler driver for the
>> PIC16 toolchain. It's under tools/llvmc/examples/mcc16.
>>
> Hi Mikhail,
> How do you build mcc16 executable?
> There are so many confusing things there: driver, plugins, example, 
> Skelton etc.
> The LLVMC-Tutorial doesn't clearly talk about them. Your help is 
> appreciated.
>
> Thanks,
> Sanjiv
>>
>> Some examples illustrating the features you requested:
>> > 2. If the user has specified to generate the final executable, then
>> > llvm-ld should run on all the .bc files generated by clang and 
>> create a
>> > single optimized .bc file for further tools.
>>
>> $ mcc16 -dry-run foo.c bar.c
>> clang-cc foo.c -o /tmp/llvm_6ibgr9/foo.bc
>> clang-cc bar.c -o /tmp/llvm_6ibgr9/bar.bc
>> llvm-ld /tmp/llvm_6ibgr9/foo.bc /tmp/llvm_6ibgr9/bar.bc \
>>     -o /tmp/llvm_6ibgr9/tmp.bc
>> llc -f /tmp/llvm_6ibgr9/tmp.bc -o /tmp/llvm_6ibgr9/tmp.s
>> native-as /tmp/llvm_6ibgr9/tmp.s -o /tmp/llvm_6ibgr9/tmp.o
>> native-ld /tmp/llvm_6ibgr9/tmp.o -o a.out
>>
>> > 3. -Wo <options> - pass optimizations to the llvm-ld
>> > 4. mcc16 -Wl <options> - pass options to native linker.
>> > 5. mcc16 -Wa <options> - pass options to native assembler.
>>
>> $ mcc16 -dry-run -Wo,-opt1 -Wllc,-opt2 -Wa,-opt3 -Wl,-opt4 foo.c
>> clang-cc foo.c -o /tmp/llvm_92HLCj/foo.bc
>> llvm-ld -opt1 /tmp/llvm_92HLCj/foo.bc -o /tmp/llvm_92HLCj/tmp.bc
>> llc -opt2 -f /tmp/llvm_92HLCj/tmp.bc -o /tmp/llvm_92HLCj/tmp.s
>> native-as -opt3 /tmp/llvm_92HLCj/tmp.s -o /tmp/llvm_92HLCj/tmp.o
>> native-ld -opt4 /tmp/llvm_92HLCj/tmp.o -o a.out
>>
>> > $ mcc16 -S foo.c
>>
>> $ mcc16 -dry-run -S foo.c
>> clang-cc foo.c -o /tmp/llvm_0uiDCR/foo.bc
>> llvm-ld /tmp/llvm_0uiDCR/foo.bc -o /tmp/llvm_0uiDCR/foo.bc
>> llc -f /tmp/llvm_0uiDCR/foo.bc -o foo.s
>>
>> > $ mcc16 -S foo.c bar.c
>>
>> $ mcc16 -dry-run -S foo.c bar.c
>> clang-cc foo.c -o /tmp/llvm_1zAqik/foo.bc
>> llvm-ld /tmp/llvm_1zAqik/foo.bc -o /tmp/llvm_1zAqik/foo.bc
>> llc -f /tmp/llvm_1zAqik/foo.bc -o foo.s
>> clang-cc bar.c -o /tmp/llvm_1zAqik/bar.bc
>> llvm-ld /tmp/llvm_1zAqik/bar.bc -o /tmp/llvm_1zAqik/bar.bc
>> llc -f /tmp/llvm_1zAqik/bar.bc -o bar.s
>>
>> > ** Use of -g causes llvm-ld to run with -disable-opt
>> > $ mcc16 -S -g foo.c
>>
>> $ mcc16 -dry-run -S -g foo.c  clang-cc foo.c -o /tmp/llvm_oQFmVn/foo.bc
>> llvm-ld -disable-opt /tmp/llvm_oQFmVn/foo.bc -o /tmp/llvm_oQFmVn/foo.bc
>> llc -f /tmp/llvm_oQFmVn/foo.bc -o foo.s
>>
>> > ** -I is passed to clang-cc, -pre-RA-sched=list-burr to llc.
>> > $ mcc16 -S -g -I ../include -pre-RA-sched=list-burr foo.c
>>
>> $ mcc16 -dry-run -S -g -I ../include -pre-RA-sched=list-burr foo.c
>> clang-cc -I ../include foo.c -o /tmp/llvm_5VxNFQ/foo.bc
>> llvm-ld -disable-opt /tmp/llvm_5VxNFQ/foo.bc -o /tmp/llvm_5VxNFQ/foo.bc
>> llc -pre-RA-sched list-burr -f /tmp/llvm_5VxNFQ/foo.bc -o foo.s
>>
>> This should be enough to get you started.
>>
>> I'm always happy to answer any further questions you may have. If
>> you want to e-mail me privately, please use the.dead.shall.rise
>> <at_sign> gmail dot com for now (our provider problems weren't
>> resolved yet).
>>
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>
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