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