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162 lines
4.9 KiB
Markdown
162 lines
4.9 KiB
Markdown
# KECC: KAIST Educational C Compiler
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## Install
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Install [rustup](https://rustup.rs/).
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## Build
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```sh
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cargo build # debug build
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cargo build --release # release build
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```
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## Run
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```sh
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cargo run --features=build-bin -- -h # print options
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cargo run --features=build-bin -- -p examples/c/fibonacci.c # parse
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cargo run --features=build-bin -- -i examples/c/fibonacci.c # irgen
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cargo run --features=build-bin -- -O --iroutput examples/c/fibonacci.c # optimize
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cargo run --features=build-bin -- examples/c/fibonacci.c # compile
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cargo run --features=build-bin -- --irrun examples/c/fibonacci.c # interprets the IR
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cargo run --features=build-bin --release -- examples/c/fibonacci.c # compile with release build
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```
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## Test
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```sh
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RUST_MIN_STACK=33554432 cargo test # debug build test
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RUST_MIN_STACK=33554432 cargo test --release # release build test
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RUST_MIN_STACK=33554432 cargo test test_examples_write_c # run write_c test
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RUST_MIN_STACK=33554432 cargo test test_examples_irgen_small # run irgen test using a small subset of examples
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RUST_MIN_STACK=33554432 cargo test test_examples_irgen # run irgen test
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RUST_MIN_STACK=33554432 cargo test test_examples_simplify_cfg # run simplify_cfg test
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RUST_MIN_STACK=33554432 cargo test test_examples_mem2reg # run mem2reg test
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RUST_MIN_STACK=33554432 cargo test test_examples_deadcode # run deadcode test
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RUST_MIN_STACK=33554432 cargo test test_examples_gvn # run gvn test
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RUST_MIN_STACK=33554432 cargo test test_examples_asmgen_small # run asmgen test using a small subset of examples
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RUST_MIN_STACK=33554432 cargo test test_examples_asmgen # run asmgen test
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RUST_MIN_STACK=33554432 cargo test test_examples_end_to_end # run irgen, optimize and asmgen pipeline test
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```
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`RUST_MIN_STACK=33554432` is necessary for deep call stack for irgen tests.
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## Fuzzing
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We encourage you to do homework using the test-driven development approach (TDD). You randomly
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generate test input, and if it fails, then reduce it as much as possible and manually inspect the
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reduced test input. For example, for homework 1, do:
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```sh
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# randomly generates test inputs and tests them
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python3 tests/fuzz.py --print
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# reduces the failing test input as much as possible
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python3 tests/fuzz.py --print --reduce
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# fix your code for the reduced test input
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cat tests/test_reduced.c
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```
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### Install
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```sh
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# Ubuntu 20.04
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sudo apt install -y make cmake python3 csmith libcsmith-dev creduce
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```
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### Run
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The following script generates 10 random test cases and tests your C AST printer:
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```sh
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python3 tests/fuzz.py --help # print options
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python3 tests/fuzz.py --print -n10 # test C AST printer for 10 times
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```
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We use `csmith` to randomly generate C source codes. `csmith` will be automatically downloaded and
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built by the test script. For more information, we refer to the
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[Csmith](https://embed.cs.utah.edu/csmith/) homepage.
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### Reduce
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When the fuzzer finds a buggy input program for your compiler, it is highly likely that the input
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program is too big to manually inspect. We use `creduce` that reduces the buggy input program as
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much as possible.
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Suppose `tests/test_polished.c` is the buggy input program. Then the following script reduces the
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program to `tests/test_reduced.c`:
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```sh
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python3 tests/fuzz.py --reduce <fuzz-option>
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```
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`<fuzz-option>` can be `--print` or `--irgen`. It shall be the one used in [Run](#run).
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### How it reduces test case?
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The script performs unguided test-case reduction using `creduce`: given a buggy program, it randomly
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reduces the program; check if the reduced program still fails on the test, and if so, replaces the
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given program with the reduced one; repeat until you get a small enough buggy program. For more
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information, we refer to the [Creduce](https://embed.cs.utah.edu/creduce/) homepage.
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**[NOTICE]** The fuzzer supports Ubuntu 20.04 only. It may work for other platforms, but if it
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doesn't, please run the fuzzer in Ubuntu 20.04.
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## Running RISC-V Binaries
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### RISC-V Documentation
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- ISA: <https://riscv.org/technical/specifications/>
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- ELF calling convention: <https://github.com/riscv-non-isa/riscv-elf-psabi-doc>
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### Install
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```sh
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# Ubuntu 20.04
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sudo apt install gcc-riscv64-linux-gnu g++-riscv64-linux-gnu qemu-user-static
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```
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### Cross-Compilation and Architecture-Emulation
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```sh
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# Compile C source code into RISC-V assembly
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riscv64-linux-gnu-gcc hello.c -S -fsigned-char -o hello.S
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# Link to an RISC-V executable
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riscv64-linux-gnu-gcc -static hello.S -o hello
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# Emulate the executable
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qemu-riscv64-static ./hello
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# Check the return value
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echo $?
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```
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## Run Benchmark for Performance Competition
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```sh
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cd bench
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make run
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```
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## Submission
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- Submit the corresponding files to [gg.kaist.ac.kr](https://gg.kaist.ac.kr).
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- Run `./scripts/make-submissions.sh` to generate `hw3.zip` to `hw6.zip`, which you should submit for homework 3 to 6.
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