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https://github.com/cisco/ChezScheme

Chez Scheme
https://github.com/cisco/ChezScheme

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Chez Scheme

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README 

        
[![test](https://github.com/cisco/ChezScheme/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/cisco/ChezScheme/actions/workflows/ci.yml)



*Tip: Clone this repo with* `git clone --filter=blob:none` *to avoid

eagerly downloading large boot files for older versions.*



Chez Scheme is both a programming language and an implementation of

that language, with supporting tools and documentation.



Supported platforms (bytecode interpreter may work for others):



 * Windows: x86, x86_64, AArch64

 * Mac OS: x86, x86_64, AArch64, PowerPC32

 * Linux: x86, x86_64, ARMv6, AArch64, RV64G, LoongArch64, PowerPC32

 * FreeBSD: x86, x86_64, ARMv6, AArch64, PowerPC32

 * OpenBSD: x86, x86_64, ARMv6, AArch64, PowerPC32

 * NetBSD: x86, x86_64, ARMv6, AArch64, PowerPC32

 * Solaris: x86, x86_64

 * GNU/Hurd: x86

 * Android: ARMv7, AArch64

 * iOS: AArch64

 * WebAssembly via Emscripten (bytecode interpreter only)



As a superset of the language described in the

[Revised6 Report on the Algorithmic Language Scheme](http://www.r6rs.org)

(R6RS), Chez Scheme supports all standard features of Scheme,

including first-class procedures, proper treatment of tail calls,

continuations, user-defined records, libraries, exceptions, and

hygienic macro expansion.



Chez Scheme also includes extensive support for interfacing with C

and other languages, support for multiple threads possibly running

on multiple cores, non-blocking I/O, and many other features.



The Chez Scheme implementation consists of a compiler, run-time

system, and programming environment.

Although an interpreter is available, all code is compiled by

default.

Source code is compiled on-the-fly when loaded from a source file

or entered via the shell.

A source file can also be precompiled into a stored binary form and

automatically recompiled when its dependencies change.

Whether compiling on the fly or precompiling, the compiler produces

optimized machine code, with some optimization across separately

compiled library boundaries.

The compiler can also be directed to perform whole-program compilation,

which does full cross-library optimization and also reduces a

program and the libraries upon which it depends to a single binary.



The run-time system interfaces with the operating system and supports,

among other things, binary and textual (Unicode) I/O, automatic

storage management (dynamic memory allocation and generational

garbage collection), library management, and exception handling.

By default, the compiler is included in the run-time system, allowing

programs to be generated and compiled at run time, and storage for

dynamically compiled code, just like any other dynamically allocated

storage, is automatically reclaimed by the garbage collector.



The programming environment includes a source-level debugger, a

mechanism for producing HTML displays of profile counts and program

"hot spots" when profiling is enabled during compilation, tools for

inspecting memory usage, and an interactive shell interface (the

expression editor, or "expeditor" for short) that supports multi-line

expression editing.



The R6RS core of the Chez Scheme language is described in

[The Scheme Programming Language](http://www.scheme.com/tspl4/),

which also includes an introduction to Scheme and a set of example programs.

Chez Scheme's additional language, run-time system, and

programming environment features are described in the

[Chez Scheme User's Guide](http://cisco.github.io/ChezScheme/csug10.0/csug.html).

The latter includes a shared index and a shared summary of forms,

with links where appropriate to the former, so it is often the best

starting point.



Get started with Chez Scheme by [Building Chez Scheme](BUILDING).



For more information about the implementation and a guide to modifying

Chez Scheme, see [implementation notes](IMPLEMENTATION.md).



For more information on Chez Scheme, see the [Chez Scheme Project Page](https://cisco.github.io/ChezScheme/).