Data stack: ( v -- )
+X-Git-Url: https://git.rrq.au/?a=blobdiff_plain;ds=sidebyside;f=reference.html;h=9137d075cfd0bd68e35fda305d8050d21cc8f636;hb=433a6cc4e7fccb418345a78de099a4e15891abcf;hp=988e55177cc3476fd286dc94d7b0324a2893bef9;hpb=d7958ae7b474ef357864237fc40412139e43b117;p=rrq%2Frrqforth.git diff --git a/reference.html b/reference.html index 988e551..9137d07 100644 --- a/reference.html +++ b/reference.html @@ -770,17 +770,24 @@ asciidoc.install(); ! C@ C! +W@ +W! +D@ +D! 2@ 2! !+ @n++ @n-- C, -S" +W, +D, +S" >R R@ R> -R[n]
+R[n] +D[n]DATA-STACK RETURN-STACK @@ -840,10 +847,13 @@ asciidoc.install(); IMMEDIATE INPUT
NEGATE NIP NL @@ -857,6 +867,7 @@ asciidoc.install(); PROGRAM_VERSION
READ-STREAM-CHAR +READ-STREAM-LINE READ-WORD REALLOC RETURN @@ -868,6 +879,7 @@ asciidoc.install(); STDIN STREAM STREAM-NCHARS +STR>TEMP STRLEN STRNCMP STRNCPY @@ -875,6 +887,10 @@ asciidoc.install(); SYSTEM
TELL .TEMP +TEMP +TEMPHELD +TEMPSPACE +TEMPUSED TERMINATE0 TFA>CFA TFA>DFA @@ -1138,6 +1154,65 @@ at the current free head address, which also is incremented.
Data stack: ( v -- )
+"W," (W-comma) is a function word that puts a "word" (double-byte) on +the HERE heap. The two least significant bytes of the value +are put at the current free head address, which also is incremented +accordingly.
Data stack: ( v -- )
+"D," (D-comma) is a function word that puts a "double word" +(double-byte) on the HERE heap. The four least significant +bytes of the value are put at the current free head address, which +also is incremented accordingly.
Data stack: ( n -- a )
+"D[n]" is a function word that pushes the address for the n:th cell of +the data stack onto the data stack.
Data stack: ( a -- v )
+"W@" is a function word that pushes the "word" (double-byte) value v +from the address a.
Data stack: ( -- v ) Return stack: ( v -- v )
+"R@" is a function word that "copies" the top return stack value onto +the data stack.
Data stack: ( v a -- )
+"W!" is a function word that stores the "word" (2-byte) value v (the +two least significant bytes of the cell) at the address a.
Data stack: ( v a -- )
+"D!" is a function word that stores the "doublw word" (4-byte) value v +(the four least significant bytes of the cell) at the address a.
Data stack: ( -- v ) Return stack: ( v -- v )
@@ -1288,7 +1415,8 @@ _______________________________________________________
"ARGS" is a value word that holds a pointer to the command line data block which consists of a count cell followed by that many asciiz -pointers and then a 0 cell.
ARGS -> 8 bytes: count of non-zero asciiz pointers following
8 bytes: command name string
- 8 bytes: first argument string
- 8* ...
- 8 zero
+ 8* bytes: argument strings
+ 8 bytes: zero cell
+ 8* bytes: envirnment strings
+ 8 bytes: zero cell
Data stack: ( -- chars* n )
"S"" is a function word that pushes the [n:char] pointer for a string -inlined subsequently to it in the containing definition. This is -similar to LIT but for a string literal.
"LIT-STRING" is a function word that pushes the char* and length n of +a subsequent inline string, then advances execution to continue after +the string. This is similar to LIT but for a block literal.
Note that the inlined byte count includes the terminating NUL byte.
Data stack: ( -- ) Input stream: " chars"
+"S"" is an immediate function word that compiles the subseqent +characters up to terminating double-quote into the current definition, +preceded by a LIT-STRING cell, and the count of +bytes scanned. The inline text includes a terminating NUL character +which also is included in the inlined count.
Note that "S"" uses " for reading the string.
Data stack: ( v1 v2 -- v3 )
+"MAX" is a function word that selects the greatest of v1 and v2. To +that end, the values are 64-bit signed integers.
Data stack: ( v1 v2 -- v3 )
+"MIN" is a function word that selects the least of v1 and v2. To that +end, the values are 64-bit signed integers.
Data stack: ( n -- a )
"R[n]" is a function word that pushes the address for the n:th cell on -the top return stack value onto the data stack.
"R[n]" is a function word that pushes the address for the n:th cell of +the return stack onto the data stack.
Data stack: ( stream -- n )
+"READ-STREAM-LINE" is a function word that gets the next line from the +given stream buffer into PAD and returns number of characters. If the +stream is backed by a file descriptor, the stream buffer is refilled +from there as needed, by a SYS_READ call when more characters are +needed.
Data stack: ( -- )
";" (semi-colon) is a function word that ends a new forth definition -by means of adding an EXIT
";" (semi-colon) is an immediate function word that ends a new forth +definition by means of adding an EXIT cell, then changing +<<p_state,STATE> to interpreting.
"STR>TEMP" is a function word that copies a given string plus a +terminating NUL character into a TEMPSPACE snippet, +all preceded by a length cell. It returns a pointer for to the text in +the snippet and its length, excluding the NUL character at end and the +length cell before tie text.
length: 8 bytes
+returned char*: n bytes
+ nul: 1 byte
+"TEMP" is a function word that "allocates" a TEMPSPACE +area of given size and returns its base address. The allocation is +temporary and only valid until there is a later allocation that +overruns this area.
Allocations are done in succession until the requested size overruns +the TEMPSPACE. If so, the allocation pointer is reset +and the space is allocated from start again. This is all intended for +small and short-lived data areas.
Data stack: ( -- a )
+"TEMPHELD" is a variable word that keeps the lowest offset of the +TEMPSPACE space to reuse upon cycling. The space +below TEMPHELD is "held" in the sense of not being reused upon +cycling. An application may change the TEMPSPACE offset as needed to +dynamically preserve memory longer term.
Data stack: ( -- a )
+"TEMPSPACE" is a variable word that holds three cells the for managing +"temporary memory":
+the size of the temporary memory space (default 104857600 bytes) +
++the base address for whole temporary memory area +
++the amount currently used +
+This memory is intended to be used by requesting snippets of memory in +a cyclic fashion via TEMP without concern about it possibly +overlapping a prior request.
Data stack: ( -- a )
+"TEMPUSED" is a variable word that keeps the lowest offset of the +TEMPSPACE space to use next as temporary space. This +is advance upon each allocation via TEMP, and recycled back +to TEMPHELD when next allocation otherwise would exceed +the space size.