gforth-fast(1) a fast and portable Forth system

Other Alias

gforth, gforthmi

SYNOPSIS

gforth [initialization options] [image-specific options] gforth-fast [initialization options] [image-specific options]

gforthmi filename [initialization options] [image-specific options]

DESCRIPTION

GForth is a fast and portable implementation of the Forth programming language. For details read the manual.

ENVIRONMENT VARIABLES

GFORTHPATH contains the search path for source and image files.

GFORTHD gives the gforth executable used by gforthmi for creating the base images. It should be a double indirect threaded system. Default: gforth-ditc.

GFORTH gives the gforth executable used by gforthmi for computing the relocatable image from the base images. Default: gforth.

GFORTHHIST gives the location of the history file used by gforth to allow command-line recall. Default: $HOME. (The history file is named .gforth-history).

EXAMPLES

gforth

starts the system and goes into interactive mode.

gforth file1 file2 -e bye

loads and interprets the files file1 and file2, then exits.

gforth-fast

is the same as gforth, except that it does not support accurate backtraces for signals, and is faster by up to a factor of 2. Use it for debugged, performance-critical programs such as benchmarks.

gforthmi asm.fi -m 1M asm.fs

creates an image asm.fi that has a default dictionary size of 1MB and has the file asm.fs loaded.

OPTIONS

--help

-h Lists the available options, including some not described here (see also the manual).
--image-file file

-i file Loads the Forth image file instead of the default gforth.fi.
--path path

-p path Uses path for searching the image file and Forth source code files instead of the default in the environment variable GFORTHPATH or the path specified at installation time (typically /usr/local/lib/gforth:.. A path is given as a :-separated list.
--dictionary-size size

-m size Allocate size space for the Forth dictionary space instead of using the default specified in the image (typically 256K). The size specification consists of an integer and a unit (e.g., 4M). The unit can be one of b (bytes), e (element size, in this case Cells), k (kilobytes), and M (Megabytes). If no unit is specified, e is used.
--data-stack-size size

-d size Allocate size space for the data stack instead of using the default specified in the image (typically 16K).
--return-stack-size size

-r size Allocate size space for the return stack instead of using the default specified in the image (typically 16K).
--fp-stack-size size

-f size Allocate size space for the floating point stack instead of using the default specified in the image (typically 16K). In this case the unit specifier e refers to floating point numbers.
--locals-stack-size size

-l size Allocate size space for the locals stack instead of using the default specified in the image (typically 16K).

--evaluate forth

-e forth Evaluates the forth code. This option takes only one argument; if you want to evaluate more Forth words, you have to quote them or use several -es. To exit after processing the command line (instead of entering interactive mode) append -e bye to the command line. This is an image-specific option of the default image.

FILES

.../gforth.fi    default Forth image
*.fi             Forth loadable image
*.fs             Forth source (sequential)
*.fb             Forth source (block)
*.fd             generated with makedoc.fs
*.i              C include files
*.ds             documentation source
*TAGS            etags files

AUTHORS

Gforth was written by Anton Ertl, Bernd Paysan, Jens Wilke and others.

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