--- gforth/kernel/quotes.fs 2000/09/23 15:47:12 1.3 +++ gforth/kernel/quotes.fs 2002/12/14 17:34:12 1.9 @@ -22,25 +22,55 @@ require ./vars.fs -create s"-buffer /line chars allot +: CLiteral ( Compilation c-addr1 u ; run-time -- c-addr ) + 2>r postpone ahead here 2r> s, >r postpone then + r> postpone literal ; immediate restrict + +: SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string +\G Compilation: compile the string specified by @i{c-addr1}, +\G @i{u} into the current definition. Run-time: return +\G @i{c-addr2 u} describing the address and length of the +\G string. + tuck 2>r postpone ahead here 2r> chars mem, align >r postpone then + r> postpone literal postpone literal ; immediate restrict + +\ \ abort" 22feb93py + +: abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote +\G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw}, +\G displaying the string @i{ccc} if there is no exception frame on the +\G exception stack. + postpone if [char] " parse postpone cliteral postpone c(abort") + postpone then ; immediate restrict + +\ create s"-buffer /line chars allot has? compiler 0= [IF] : s" [ELSE] :noname [THEN] [char] " parse - /line min >r s"-buffer r@ cmove - s"-buffer r> ; +[ has? OS [IF] ] + save-mem +[ [THEN] ] +; +\ /line min >r s"-buffer r@ cmove +\ s"-buffer r> ; has? compiler [IF] :noname [char] " parse postpone SLiteral ; interpret/compile: S" ( compilation 'ccc"' -- ; run-time -- c-addr u ) \ core,file s-quote \G Compilation: Parse a string @i{ccc} delimited by a @code{"} \G (double quote). At run-time, return the length, @i{u}, and the \G start address, @i{c-addr} of the string. Interpretation: parse - \G the string as before, and return @i{c-addr}, @i{u}. The - \G string is stored in a temporary buffer which may be overwritten - \G by subsequent uses of @code{S"}. + \G the string as before, and return @i{c-addr}, @i{u}. Gforth + \G @code{allocate}s the string. The resulting memory leak is usually + \G not a problem; the exception is if you create strings containing + \G @code{S"} and @code{evaluate} them; then the leak is not bounded + \G by the size of the interpreted files and you may want to + \G @code{free} the strings. ANS Forth only guarantees one buffer of + \G 80 characters, so in standard programs you should assume that the + \G string lives only until the next @code{s"}. [THEN] :noname [char] " parse type ; -:noname postpone (.") ," align ; +:noname [char] " parse postpone sLiteral postpone type ; interpret/compile: ." ( compilation 'ccc"' -- ; run-time -- ) \ core dot-quote \G Compilation: Parse a string @i{ccc} delimited by a " (double \G quote). At run-time, display the string. Interpretation semantics