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README |
This is a basic compiler driver for the PIC16 toolchain that shows how to create your own llvmc-based drivers. It is based on the example/Skeleton template. The PIC16 toolchain looks like this: clang-cc (FE) -> llvm-ld (optimizer) -> llc (codegen) -> native-as -> native-ld Following features were requested by Sanjiv: From: Sanjiv Gupta <sanjiv.gupta <at> microchip.com> Subject: Re: llvmc for PIC16 Newsgroups: gmane.comp.compilers.llvm.devel Date: 2009-06-05 06:51:14 GMT The salient features that we want to have in the driver are: 1. llvm-ld will be used as "The Optimizer". 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. 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. Here are some example command lines and sample command invocations as to what should be done. $ mcc16 -S foo.c // [clang-cc foo.c] -> foo.bc // [llvm-ld foo.bc] -> foo.opt.bc // [llc foo.opt.bc] -> foo.s $ mcc16 -S foo.c bar.c // [clang-cc foo.c] -> foo.bc // [llvm-ld foo.bc] -> foo.opt.bc // [llc foo.opt.bc] -> foo.s // [clang-cc bar.c] -> bar.bc // [llvm-ld bar.bc] -> bar.opt.bc // [llc bar.opt.bc] -> bar.s ** Use of -g causes llvm-ld to run with -disable-opt $ mcc16 -S -g foo.c // [clang-cc foo.c] -> foo.bc // [llvm-ld -disable-opt foo.bc] -> foo.opt.bc // [llc foo.opt.bc] -> 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 // [clang-cc -I ../include foo.c] -> foo.bc // [llvm-ld -disable-opt foo.bc] -> foo.opt.bc // [llc -pre-RA-sched=list-burr foo.opt.bc] -> foo.s ** -Wo passes options to llvm-ld $ mcc16 -Wo=opt1,opt2 -S -I ../include -pre-RA-sched=list-burr foo.c // [clang-cc -I ../include foo.c] -> foo.bc // [llvm-ld -opt1 -opt2 foo.bc] -> foo.opt.bc // [llc -pre-RA-sched=list-burr foo.opt.bc] -> foo.s ** -Wa passes options to native as. $ mcc16 -c foo.c -Wa=opt1 // [clang-cc foo.c] -> foo.bc // [llvm-ld foo.bc] -> foo.opt.bc // [llc foo.opt.bc] -> foo.s // [native-as -opt1 foo.s] -> foo.o $ mcc16 -Wo=opt1 -Wl=opt2 -Wa=opt3 foo.c bar.c // [clang-cc foo.c] -> foo.bc // [clang-cc bar.c] -> bar.bc // [llvm-ld -opt1 foo.bc bar.bc] -> a.out.bc // [llc a.out.bc] -> a.out.s // [native-as -opt3 a.out.s] -> a.out.o // [native-ld -opt2 a.out.o] -> a.out Is this achievable by a tablegen based driver ? - Sanjiv