lcc: A Based Of LLVM C Compiler

This is the source code Tutorial. Lcc is based llvm c99 compiler. You can click this to visit my video and this compiler tutorial.

This project will implement almost all ISO C99 syntax and can work on Windows, Linux and Mac OS X.

ISO C 99 Doc link (pdf file): C99

Current Status:

Module	Status
Preprocess	working...
Lexer	100%
Parser	100%
Semantics	5%
CodeGen	working...

Test Status:

catch2 will be integrated in the future

Compile and Run

Install the latest LLVM library or Build LLVM manually

一：Install the latest LLVM library

Mac:
----------------------
1, install homebrew 
reference: https://brew.sh/
or reference: https://brew.idayer.com/

2, brew install llvm

Linux:
----------------------
1, sudo apt-get update
2, sudo apt-get -y install llvm-12

Windows:
----------------------
reference:  https://blog.csdn.net/kingfox/article/details/117450533

二：Build LLVM manually

git clone https://github.com/llvm/llvm-project.git
cd llvm-project/llvm  && mkdir llvm_install_dir && mkdir build
cd build
cmake -GNinja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=../llvm_install_dir ../llvm

How to use lcc

一：Compile

1, git clone git@github.com:iiicp/lcc.git
2, cd lcc && mkdir build && cd build 
3, cmake -GNinja -DLLVM_DIR="Path to Your LLVM CMake dir" ..
4, ninja 

二：Run

lcc support --dumpTokens and --dumpAst command line options

./lcc --help
./lcc -emit-tokens ../tests/c/stmt.c
./lcc -emit-ast ../tests/c/stmt.c 

lcc unsupported c99 language features

1. unicode char
2. _Complex
3. direct-declarator ( identifier-list{opt} )
   eg: int f(a, b) int a,b {return a+b;}

Reference

• cld
• chibicc
• ucc