Annotation of gforth/source.fs, revision 1.23

1.1       anton       1: \ source location handling
                      2: 
1.23    ! anton       3: \ Copyright (C) 1995,1997,2003,2004,2007,2009,2011 Free Software Foundation, Inc.
1.1       anton       4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
1.18      anton       9: \ as published by the Free Software Foundation, either version 3
1.1       anton      10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
1.18      anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.1       anton      19: 
1.3       pazsan     20: \ related stuff can be found in kernel.fs
1.1       anton      21: 
1.9       anton      22: \ this stuff is used by (at least) assert.fs and debugs.fs
1.1       anton      23: 
1.10      anton      24: : loadfilename#>str ( n -- addr u )
1.12      anton      25:     included-files 2@ rot min 2* cells + 2@ ;
1.10      anton      26: 
                     27: : str>loadfilename# ( addr u -- n )
                     28:     included-files 2@ 0 ?do ( addr u included-files )
                     29:        i over >r 2* cells + 2@
                     30:        2over str= if
                     31:            rdrop 2drop i unloop exit
                     32:        endif
                     33:        r> loop
1.22      anton      34:     drop 2drop -1 ;
1.10      anton      35: 
1.20      anton      36: \ we encode line and character in one cell to keep the interface the same
                     37: : encode-pos ( nline nchar -- npos )
                     38:     $ff min swap 8 lshift + ;
1.15      anton      39: 
1.20      anton      40: : decode-pos ( npos -- nline nchar )
                     41:     dup 8 rshift swap $ff and ;
                     42: 
                     43: : current-sourcepos ( -- nfile npos )
                     44:     sourcefilename  str>loadfilename# sourceline# >in @ encode-pos ;
                     45: 
                     46: : compile-sourcepos ( compile-time: -- ; run-time: -- nfile npos )
1.9       anton      47:     \ compile the current source position as literals: nfile is the
                     48:     \ source file index, nline the line number within the file.
1.20      anton      49:     current-sourcepos
                     50:     swap postpone literal
                     51:     postpone literal ;
1.9       anton      52: 
1.20      anton      53: : .sourcepos ( nfile npos -- )
1.9       anton      54:     \ print source position
1.20      anton      55:     swap loadfilename#>str type ': emit
                     56:     base @ decimal
                     57:     swap decode-pos swap 0 .r ': emit 0 .r
                     58:     base ! ;
                     59: 
1.22      anton      60: : save-source-filename ( c-addr1 u1 -- c-addr2 u2 )
                     61:     \ c-addr1 u1 is a temporary string for a file name, c-addr2 u2 is
                     62:     \ a permanent one.  Reuses strings for the same file names and
                     63:     \ adds them to the included files (not sure if that's a good idea)
                     64:     2dup str>loadfilename# dup 0< if
                     65:        drop save-mem 2dup add-included-file
                     66:     else
                     67:        nip nip loadfilename#>str
                     68:     then ;
                     69: 
                     70: : #line ( "u" "["file"]" -- )
                     71:     \g Set the line number to @i{u} and (if present) the file name to @i{file}.  Consumes the rest of the line.
                     72:     \g 
                     73:     parse-name ['] evaluate 10 base-execute 1- loadline !
                     74:     '"' parse 2drop '"' parse dup if
                     75:        save-source-filename loadfilename 2!
                     76:     else
                     77:        2drop
                     78:     then
                     79:     postpone \ ;

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