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84 lines
2.2 KiB
Markdown
84 lines
2.2 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 -- -h # print options
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cargo run -- -p examples/fibonacci.c # parse
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cargo run -- -i examples/fibonacci.c # irgen
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cargo run -- examples/fibonacci.c # compile
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cargo run --release -- examples/fibonacci.c # compile with release build
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```
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## Test
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```
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cargo test # debug build test
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cargo test --release # release build test
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cargo test <test-name> # run a particular test
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```
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`<test-name>` can be `test_examples_write_c`, `test_examples_irgen`, ...
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## Fuzzing
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### Install
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```sh
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# Ubuntu 18.04 or higher
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apt install -y make cmake python3
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apt install -y 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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