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Official chibi-scheme repository
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The original Scheme implementation is astonishingly slow. Rewriting SHA-2 in C yields around x10000 speed boost for premade strings and bytevectors. For input ports this is alleviated to x100 boost. The implementation is divided into two parts: native computational backend and thin Scheme interface. It is tedious to properly do IO from C, so the Scheme code handles reading data from an input port and the C code performs actual computations on byte buffers (which is also used to handle strings and bytevectors directly). Scheme wrapper reads data in chunked manner with 'read-bytevector'. Currently, the chunk size has insignificant impact on performance as soon as it is bigger than 64. Also, using simply read-bytevector turned out to be 33% faster than preallocating a buffer and filling it with read-bytevector! One tricky part is how to get exact 32-bit integers in C89. We have no <inttypes.h> there, so instead we use <limits.h> to see whether we have a standard type with suitable boundaries. The other one is how to return a properly tagged sha_context from C. Chibi FFI currently cannot handle the case when a procedure returns either a C pointer (which needs to be boxed) or an exception (which should be left as is). To workaround this sexp_start_sha() receives a dummy argument of type sha_context; this makes Chibi FFI to put a proper type tag into 'self', which is then extracted in the C code. This commits adds a new shared library 'crypto$(SO)' with intent to keep there all native code of (chibi crypto) libraries. This allows to simply put any future native implementation of SHA-512 or MD5 in some md5.c and just include those files into crypto.stub. |
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| benchmarks | ||
| build-lib/chibi/char-set | ||
| contrib | ||
| data | ||
| doc | ||
| examples | ||
| include/chibi | ||
| lib | ||
| opt | ||
| tests | ||
| tools | ||
| .gitignore | ||
| .hgignore | ||
| AUTHORS | ||
| bignum.c | ||
| chibi-scheme.pc.in | ||
| chibi-scheme.vcproj | ||
| COPYING | ||
| eval.c | ||
| fedora.spec | ||
| gc.c | ||
| main.c | ||
| Makefile | ||
| Makefile.detect | ||
| Makefile.libs | ||
| mkfile | ||
| opcodes.c | ||
| plan9.c | ||
| README | ||
| README.libs | ||
| RELEASE | ||
| sexp.c | ||
| simplify.c | ||
| TODO | ||
| VERSION | ||
| vm.c | ||
Chibi-Scheme
--------------
Minimal Scheme Implementation for use as an Extension Language
http://synthcode.com/wiki/chibi-scheme/
Chibi-Scheme is a very small library intended for use as an extension
and scripting language in C programs. In addition to support for
lightweight VM-based threads, each VM itself runs in an isolated heap
allowing multiple VMs to run simultaneously in different OS threads.
The default repl language contains all bindings from R7RS small,
available explicitly as the (scheme small) library.
Support for additional languages such as JavaScript, Go, Lua and Bash
are planned for future releases. Scheme is chosen as a substrate
because its first class continuations and guaranteed tail-call
optimization makes implementing other languages easy.
To build on most platforms just run "make && make test". This will
provide a shared library "libchibi-scheme", as well as a sample
"chibi-scheme" command-line repl. You can then run
sudo make install
to install the binaries and libraries. You can optionally specify a
PREFIX for the installation directory:
make PREFIX=/path/to/install/
sudo make PREFIX=/path/to/install/ install
By default files are installed in /usr/local.
If you want to try out chibi-scheme without installing, be sure to set
LD_LIBRARY_PATH so it can find the shared libraries.
For more detailed documentation, run "make doc" and see the generated
"doc/chibi.html".