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# SKINT - Cheap and Fast R7RS Scheme Interpreter # SKINT - Cheap and fast R7RS Scheme Interpreter
SKINT is a portable interpreter for the R7RS Scheme programming language. 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: It can be built from five C source files with a single command. There is no distributives or packages:
@ -16,17 +16,18 @@ 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 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). and 64-bit systems (tested on Windows and Linux).
For much better performance (especially in floating-point calculations), you may add optimization options, e.g.: 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.:
``` ```
gcc -o skint -O3 -DNDEBUG -DNAN_BOXING [skint].c -lm clang -o skint -O3 -D NDEBUG -D NAN_BOXING [skint].c -lm
``` ```
NAN_BOXING option assumes that upper 16 bit of heap pointers are zero (48-bit address space). If this assumption holds, 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. it is recommended to use this option on 64-bit systems.
The resulting interpreter has no dependencies (except for C runtime and standard -lm math library) and can be run from any location. The resulting interpreter has no dependencies (except for C runtime and standard -lm math library) and can be run from any location.
If compiled statically, it can be easily moved between systems with the same ABI. If linked statically, it can be easily moved between systems with the same ABI.
## Scheme Compatibility ## Scheme Compatibility
@ -51,18 +52,18 @@ Some features of the R7RS-Small standard are not yet implemented or implemented
Here are some details on SKINT's interactive Read-Eval-Print-Loop (REPL) and evaluation/libraries support: Here are some details on SKINT's interactive Read-Eval-Print-Loop (REPL) and evaluation/libraries support:
* `read` supports R7RS notation for circular structures, but both `eval` and `load` reject them * `read` supports R7RS notation for circular structures, but both `eval` and `load` reject them
* all supported R7RS-small forms are available in the built-in `(skint)` library and REPL environment * all R7RS-small forms are available in the built-in `(skint)` library and REPL environment
* `-I` and `-A` command-line options extend library search path; initial path is `./` * `-I` and `-A` command-line options extend library search path; initial path is `./`
* `cond-expand` checks against `(features)` and available libraries * `cond-expand` checks against `(features)` and available libraries
* `environment` dynamically fetches library definitions from `.sld` files * `environment` may dynamically fetch external library definitions from `.sld` files
* both `eval` and `load` accept optional environment argument * both `eval` and `load` accept optional environment argument
* command-line options can be shown by running `skint --help` * command-line options can be shown by running `skint --help`
* both `import` and `define-library` forms can be entered interactively into REPL * both `import` and `define-library` forms can be entered interactively into REPL
* REPL supports single-line `comma-commands` — type `,help` for a full list * REPL supports single-line “comma-commands” — type `,help` for a full list
* on Un*x-like systems, interactive use of skint with line exiting requires external readline wrapper * on Un*x-like systems, interactive use of skint with line exiting requires external readline wrapper
such as [rlwrap](https://github.com/hanslub42/rlwrap) such as [rlwrap](https://github.com/hanslub42/rlwrap)
Please note that SKINT's interaction environment exposes bindings for all supported R7RS-small procedures Please note that SKINT's interaction environment exposes bindings for all R7RS-small procedures
and syntax forms directly, so there is no need to use `import`. All R7RS-small libraries are built-in and and syntax forms directly, so there is no need to use `import`. All R7RS-small libraries are built-in and
do not rely on any external .sld files. do not rely on any external .sld files.
@ -73,12 +74,12 @@ a language for building Scheme-like systems. Its #F source code can be found the
[skint/pre](https://github.com/false-schemers/skint/tree/main/pre) [skint/pre](https://github.com/false-schemers/skint/tree/main/pre)
SKINT's hygienic macroexpander is derived from Alan Petrofsky's EIOD 1.17 (please see the t.scm file for the original copyright info). SKINT's hygienic macroexpander is derived from Al Petrofsky's EIOD 1.17 (please see the t.scm file for the original copyright info).
SKINT's VM and compiler follow the stack machine approach described in "Three Implementation Models for Scheme" thesis by R. Kent Dybvig SKINT's VM and compiler follow the stack machine approach described in “Three Implementation Models for Scheme” thesis by R. Kent Dybvig
([TR87-011](https://www.cs.unc.edu/techreports/87-011.pdf), 1987). ([TR87-011](https://www.cs.unc.edu/techreports/87-011.pdf), 1987).
Supporting library code comes from #F's [LibL library](https://raw.githubusercontent.com/false-schemers/sharpF/master/lib/libl.sf). Supporting library code comes from #F's [LibL library](https://raw.githubusercontent.com/false-schemers/sharpF/master/lib/libl.sf).
## Family ## Family
Please see [SIOF](https://github.com/false-schemers/siof) repository for a single-file R7RS-small interpreter. It is Please see [SIOF](https://github.com/false-schemers/siof) repository for a single-file R7RS-small interpreter. It is
more portable and easier to build, but runs significantly slower. more portable and easier to build, but is less complete and runs significantly slower.