![]() ![]() SwiftForth runs in a single, contiguous, flat 32-bit address space. SwiftForth’s CPU register usage RegisterĪll other CPU registers are available for use without saving and restoring. Many of the kernel-level CODE words are marked to be inlined. The compiler will automatically inline a definition whose INLINE field is set. SwiftForth takes advantage of this by having a header flag that indicates if a word is to be compiled inline or called. The nature of a subroutine-threaded implementation lends itself to inline code expansion. At the end of a colon definition, the conventional EXIT is replaced by a subroutine return (or by tail recursion). ![]() SwiftForth substitutes direct code in place of subroutine calls wherever possible for efficiency.Ĭolon and code definitions do not have a code field distinct from the content of the definition itself data structures typically have a code field consisting of a call to the code for that data type. Subroutine threading is an implementation strategy in which references in a colon definition are compiled as subroutine calls. SwiftForth is a 32-bit, subroutine-threaded Forth system running as user application under Windows, Linux, and macOS. This section describes the implementation of the Forth virtual machine, and will be of interest to experienced Forth programmers. SwiftForth is designed to produce optimal performance. If you’re looking for something for your Beaglebone, Raspberry Pi, or other embedded ARM Linux board, check out SwiftX-ARM for Linux targets. SwiftForth requires an i386-compatible CPU.
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