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@ -3,9 +3,9 @@
# Cheap and fast R7RS Scheme Interpreter
SKINT is a portable interpreter for the R7RS Scheme programming language.
It can be built from five C source files with a single command. There is no distributives or packages:
just compile the source files with your favorite C compiler, link them with the standard C runtime libraries
and be done with it. For some platforms, precompiled binaries are available (please see [releases](https://github.com/false-schemers/skint/releases)).
It can be built from five C source files with a single command. There is no distributives or packages;
just compile the source files with your favorite C compiler, link them with the standard C runtime libraries,
and you're done. For some platforms, precompiled binaries are available (please see [releases](https://github.com/false-schemers/skint/releases)).
## Installation
@ -18,20 +18,20 @@ gcc -o skint [skint].c -lm
Some compilers link `<math.h>` library automatically, some require explicit option like `-lm` above. It can be built on 32-bit
and 64-bit systems (tested on Windows and Linux).
For much better performance (especially in floating-point calculations), you may pick another compiler, add optimization options,
and add some SKINT-spicific flags, e.g.:
For much better performance (especially in floating-point calculations) you may pick another compiler, add optimization flags,
and some SKINT-spicific options, e.g.:
```
clang -o skint -O3 -D NDEBUG -D NAN_BOXING [skint].c -lm
```
The NAN_BOXING option assumes that upper 16 bit of heap pointers are zero (48-bit address space). If this assumption holds,
it is recommended to use this option on 64-bit systems.
The NAN_BOXING option assumes that the upper 16 bits of heap pointers are zero (48-bit address space). It is recommended to use this
option on 64-bit systems that guarantee this.
The resulting interpreter has no dependencies (except for C runtime and standard -lm math library) and can be run from any location.
If linked statically, it can be easily moved between systems with the same ABI.
If you would prefer these decisions to be made for you, please follow the instructions below. Skint will be
For a more traditional install, please follow the instructions below. Skint will be
installed as `/usr/local/bin/skint` command.
```
@ -44,9 +44,9 @@ $ sudo make install
## Scheme Compatibility
SKINT is true to basic Scheme principles -- it features precise garbage collector, supports proper tail recursion, `call/cc`,
`dynamic-wind`, multiple return values, and has a hygienic macro system and a library system. It is almost fully compatible
with R7RS-small, but it has the following known limitations and deviations from the standard:
SKINT is true to basic Scheme principles -- it features a precise garbage collector, supports proper tail recursion, `call/cc`,
`dynamic-wind`, multiple return values, has a hygienic macro system, and a library system. It is almost fully compatible
with R7RS-small, but has the following known limitations and deviations from the standard:
* fixnums are 30 bit long, flonums are doubles
* no support for bignums/rational/complex numbers