Blang - B compiler for modern systems

Blang is a compiler for the B programming language, developed by Ken Thompson and Dennis Ritchie at Bell Labs in 1970, later getting replaced by C. Blang is written in C99 and relies on a minimal set of dependencies, namely libc and the GNU binutils.

This repository also includes a libb.a implementation, B's standard library. It requires zero dependencies, not even libc.

Blang is implemented as a small single-pass compiler in ~2000 lines of pure C99 code. Therefore, it features small compile times with a very low memory footprint.

Current Status

• global variables
• functions
• auto & extrn variables
• control flow statements
• expressions
• libb.a standard library
• optimization
• nicer error messages

Compatibility

Due to Blang's simplicity, only gnu-linux-x86_64-systems are supported.

• If your system can run GNU-make, GNU-ld and GNU-as, Blang itself should be able to work.
• Because of the reliance on system-calls libb.a has to be implemented for each system separately.

Note Feel free to submit pull requests to provide more OS support and fix bugs.

Installation

To install Blang, first clone this repository:

$ git clone https://github.com/nikhilesh-927/Blang
$ cd ./Blang

To install Blang on your computer globally, use:

$ sudo apt make install

Warning this requires root privileges and modifies system files

Usage

To compile a B source file (.b), use:

$ blang file1.b (your file in b language) -o output

To see the output on your console:

$ ./output

To get help, type:

$ blang --help

Licensing

Blang is licensed under the MIT License. See LICENSE in this repository for further information.

References

• Bell Labs User's Reference to B by Ken Thompson (Jan. 7, 1972)

• Wikipedia entry: B (programming language)