Mercurial > hg > index.cgi

annotate src/error.s @ 75:5f8f0b0781e8

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Split some code into separate files for easier management (3) Because the source for lwbasic is so large, split it into several different files to make it easier to navigate and modify. This is part three of the split. Includes a file missing from part one.
author William Astle <lost@l-w.ca>
date Sun, 06 Aug 2023 00:41:26 -0600
parents
children bb50ac9fdf37
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
75
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
1 *pragmapush list
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
2 *pragma list
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
3 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
4 ; The error handler
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
5 ;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
6 ; Enter with the error number in B. This routine will do some cleanup and handle any ON ERROR GOTO handler that
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
7 ; may be active.
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
8 ;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
9 ; Note the error message lookup does not need to be efficient which is why the lookup just runs through the list
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
10 ; of error messages in sequence looking for NUL terminators. The specific handling of B (error number) below avoids
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
11 ; issues if there happen to be error codes above 128.
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
12 ERROR clr filenum ; reset display device to console
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
13 jsr writecondnl ; do a newline if needed (will preserve B)
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
14 ldx #errormsg ; point to error message list
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
15 incb ; account for decb below
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
16 bra ERROR1 ; go search for correct message
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
17 ERROR0 lda ,x+ ; end of message?
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
18 bne ERROR0 ; brif not end of message
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
19 ERROR1 decb ; at the correct one?
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
20 bne ERROR0 ; brif not - skip to next one
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
21 ERROR2 jsr writestrconduc ; output error message
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
22 ldu curline ; are we in immediate mode?
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
23 beq ERROR3 ; brif so
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
24 ldx #inmsg ; point to " in "
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
25 jsr writestrconduc ; output " in "
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
26 ldd 2,u ; get line number
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
27 jsr print_uint16d ; display the line number
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
28 ERROR3 lds freetop ; reset the stack pointer (error routine could be called anywhere)
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
29 clr ,-s ; reset the call stack
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
30 sts stackptr
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
31 jmp immediate ; go back to immediate mode
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
32 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
33 ; Error messages
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
34 ;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
35 ; Each error begins with a deferr macro invocation which will define a symbol err_slug with the next error number
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
36 ;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
37 ; deferr slug
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
38 ;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
39 ; This is then followed by the error message defined with fcn.
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
40 ;
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
41 ; Real error numbers start at 1; 0 is used to indicate no error.
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
42 *pragmapush list
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
43 *pragma nolist
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
44 __errnum set 0
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
45 deferr macro noexpand
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
46 err_{1} equ __errnum
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
47 __errnum set __errnum+1
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
48 endm
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
49 *pragmapop list
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
50 errormsg deferr none
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
51 fcn 'No error'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
52 deferr nf
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
53 fcn 'NEXT without FOR'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
54 deferr sn
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
55 fcn 'Syntax error'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
56 deferr ul
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
57 fcn 'Undefined line number'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
58 deferr rg
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
59 fcn 'RETURN without GOSUB'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
60 deferr ov
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
61 fcn 'Overflow'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
62 deferr tm
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
63 fcn 'Type mismatch'
5f8f0b0781e8 Split some code into separate files for easier management (3)
William Astle <lost@l-w.ca>
parents:
diff changeset
64 *pragmapop list