By Edward K. Conklin, Elizabeth D. Rather
The recent 3rd Editon of Forth Programmer's instruction manual (ISBN 1419675494) is now on hand on Amazon.com.
Forth Programmer's guide presents a reference resource for the most typical gains of the built-in software program improvement structures in accordance with the Forth programming language. It assumes not less than an trouble-free wisdom of the Forth language, in keeping with having studied beginning Forth and attended a Forth programming path, or the similar. when you are new to Forth, we motivate you to start by way of interpreting beginning Forth rigorously and dealing the issues on the finish of every chapter.
This e-book is basically meant to explain how a programmer can use Forth to unravel difficulties. this can be a really assorted aim from explaining how Forth works, however it is a pragmatic necessity for the hot consumer of a Forth procedure. This handbook is additionally geared up to serve skilled programmers who have to money a few element speedy.
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Additional info for Forth programmer's handbook
The net effect of these differences is usually to facilitate keeping the assembler resident at all times, without adverse impact even on relatively limited platforms, leading in turn to significantly simplified development procedures. ). Notation specifying these has been standardized across all Forths, to make it easier for programmers working with several different CPUs. Naturally, this means the notation differs from the manufacturer ’s notation; however, all modes supported by the processor are implemented in the Forth assembler.
68000 cross-compiler, for example), you get: Introduction 25 Forth Programmer’s Handbook SEE /STRING 9B6 4 A6) A6 -) MOV 9BA ' MIN BSR 9BE A6 )+ A7 -) MOV 9C0 ' SWAP BSR 9C4 A7 ) A6 -) MOV 9C6 A6 )+ D0 MOV 9C8 D0 A6 ) ADD 9CA ' SWAP BSR 9CE A7 )+ A6 -) MOV 9D0 A6 )+ D0 MOV 9D2 D0 A6 ) SUB 9D4 RTS ok(T) This example clearly shows the combination of in-line code and subroutine calls in this subroutine-threaded implementation. An alternative approach is to start disassembly or decompilation at some address.
Care-plus” Core CHARS ( n1 — n2 ) Core Return n2, the size in bytes of n1 characters. On many systems, this word is a no-op. “cares” Forth Fundamentals 41 Forth Programmer’s Handbook LSHIFT ( x1 u — x2 ) Core Perform a logical left shift of u places on x1, giving x2. Fill the vacated leastsignificant bits with zeroes. “L-shift” MOD ( n1 n2 — n3 ) Divide n1 by n2, giving the remainder n3. RSHIFT Core ( x1 u — x2 ) Perform a logical right shift of u places on x1, giving x2. Fill the vacated mostsignificant bits with zeroes.