https://github.com/aap/b

B compiler
https://github.com/aap/b

b compiler

Last synced: 4 days ago
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B compiler

• Host: GitHub
• URL: https://github.com/aap/b
• Owner: aap
• License: mit
• Created: 2020-08-28T13:17:57.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2023-07-12T17:37:24.000Z (over 1 year ago)
• Last Synced: 2023-07-12T18:31:48.457Z (over 1 year ago)
• Topics: b, compiler
• Language: Assembly
• Homepage:
• Size: 71.3 KB
• Stars: 44
• Watchers: 4
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
B compiler

==========

Here you can find three B compilers.

One written in C and one written in B itself.

Both generate the original threaded code as described

[here](http://squoze.net/B/).

The state of this repo is rather chaotic right now. sorry.

## B compiler in C

This compiler I wrote to bootstrap B.

It is a single executable and can produce code

for PDP-11, amd64, mips32 and riscv64 assemblers.

It is good enough to compile bc.b and ba.b.

## B compiler in B

This one is the real deal.

It works in two phases.

`bc.b` compiles a B file to an intermediate format

and `ba.b` further processes it to assembly.

Except for word size the first pass should mostly be

platform independent.

The second pass is assembler and to some degree platform

dependent.

## B for UNIX v1

Having discovered a few B binaries I set out to

reconstruct the B compiler as closely as I could

and get it to run on UNIX v1.

You can find the result in the `unix1_bdir` directory.

Platforms

=========

B has been confirmed to compile itself on the following platforms:

- Linux amd64

- Linux mips32 (ci20 devboard)

- Linux riscv64

- 2.11BSD PDP-11

TODO

====

- Get rid of chaos

- More platforms

- make mips code work on cpus with load delay