Ypsilon: R7RS/R6RS Scheme Implementation

• Conforms to R7RS/R6RS

• Mostly concurrent garbage collector optimized for multi-core processor

• Incremental native code generation with background compilation threads

• On-the-fly FFI with native stub code generation

• Full features of R6RS and R6RS standard libraries including:

  • arbitrary precision integer arithmetic
  • rational number
  • exact and inexact complex number
  • top-level program
  • proper tail recursion
  • call/cc and dynamic wind
  • unicode
  • bytevectors
  • records
  • exceptions and conditions
  • i/o
  • syntax-case
  • hashtables
  • enumerations

• Full features of R7RS-small and following R7RS-large libraries:

  • (scheme comparator)
  • (scheme hash-table)
  • (scheme list)
  • (scheme sort)

• See LICENSE for terms and conditions of use.

Performance

• Ypsilon 2.0.8 outperform Guile 3.0.8 in r7rs-benchmarks for 31 of 55 programs on WSL2, Ubuntu 20.04, Ryzen 3700X 3.6GHz. https://fujita-y.github.io/benchmarks/ubuntu-llvm12-ryzen3700x-ypsilon-208-guile-308.pdf

Documents

• API Reference

Requirements

• LLVM 10, 11, 12, 13, 14, or 15

Installation

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
cmake --build .
cmake --install .

• On MacOS, you may want using Homebrew to install LLVM 15.

brew update
brew install llvm
echo 'export PATH="/opt/homebrew/opt/llvm/bin:$PATH"' >> ~/.zshrc

Optional

• You may want using rlwrap to make the REPL easier to use.

# Ubuntu 21.04
apt install rlwrap

# Homebrew on MacOS
brew install rlwrap

Run

• To run R7RS sample script, try following from project root:

ypsilon --r7rs test/r7rs-sample.scm

• To run FFI demo program, try follwing from project root:

ypsilon --r6rs --top-level-program demo/glut-demo.scm # (OpenGL 1.x, GLUT)
ypsilon --r6rs --top-level-program demo/glfw-demo.scm # (OpenGL 1.x, GLFW)
ypsilon --r6rs --top-level-program demo/glcorearb-demo.scm # (OpenGL Core Profile, GLFW)
ypsilon --r6rs --top-level-program demo/freetype-demo.scm # (OpenGL Core Profile, GLFW, freetype)
ypsilon --r6rs --top-level-program demo/widget-demo.scm # (OpenGL Core Profile, GLFW, freetype)

Docker

• Container image is available on Docker Hub for amd64 and arm64.

$ docker run --rm -it fujitay/ypsilon:latest ypsilon --r7rs
ypsilon-2.0.8 (r7rs)
> (magnitude 3/22+2/11i)
5/22
> (exit)

Packages

Notes

• REPL start with (import (scheme base) (scheme process-context)) or (import (rnrs base) (rnrs programs)) depending on the command line options specified.
• Without --top-level-program option, the contents of the specified script file will be interpreted as if they had been entered into the REPL.

Rebuild heap files

• Open 'src/core.h' and set 'UNBOUND_GLOC_RETURN_UNSPEC' to '1'
• make
• Edit .scm files in 'heap/boot' directory
• cd heap; make; cd ..; make; cd heap; make; cd ..
• Open 'src/core.h' and set 'UNBOUND_GLOC_RETURN_UNSPEC' to '0'
• make

Versions

• Ypsilon version 2 have major design changes. Former version is available at version-0.9.
• This project is migrated from code.google.com/p/ypsilon