mirror of https://gitlab.com/camelot/kickc.git
213 lines
4.2 KiB
NASM
213 lines
4.2 KiB
NASM
// Demonstrates problem with missing parenthesis in double-dereferencing
|
|
// https://gitlab.com/camelot/kickc/issues/270
|
|
// Commodore 64 PRG executable file
|
|
.file [name="struct-ptr-22.prg", type="prg", segments="Program"]
|
|
.segmentdef Program [segments="Basic, Code, Data"]
|
|
.segmentdef Basic [start=$0801]
|
|
.segmentdef Code [start=$80d]
|
|
.segmentdef Data [startAfter="Code"]
|
|
.segment Basic
|
|
:BasicUpstart(main)
|
|
.label print_screen = $400
|
|
.label print_char_cursor = 4
|
|
.label print_line_cursor = 6
|
|
.segment Code
|
|
main: {
|
|
.label __13 = 6
|
|
// file->bufEdit = (char*)0x4000
|
|
lda #<$4000
|
|
sta files
|
|
lda #>$4000
|
|
sta files+1
|
|
// file->bufEdit[3] = 0xAA
|
|
lda #$aa
|
|
ldy #3
|
|
ldx files
|
|
stx.z $fe
|
|
ldx files+1
|
|
stx.z $ff
|
|
sta ($fe),y
|
|
// ((char *)file->bufEdit)[4] = 0xCC
|
|
lda files
|
|
sta.z __13
|
|
lda files+1
|
|
sta.z __13+1
|
|
// writes address 0x0000 (wrong!)
|
|
lda #$cc
|
|
ldy #4
|
|
sta (__13),y
|
|
// print_cls()
|
|
// writes address 0x4004 (right!)
|
|
jsr print_cls
|
|
// print_str("$0000=")
|
|
lda #<print_screen
|
|
sta.z print_char_cursor
|
|
lda #>print_screen
|
|
sta.z print_char_cursor+1
|
|
lda #<str
|
|
sta.z print_str.str
|
|
lda #>str
|
|
sta.z print_str.str+1
|
|
jsr print_str
|
|
// print_uchar(*(char *)0x0000)
|
|
ldx.z 0
|
|
jsr print_uchar
|
|
// print_ln()
|
|
lda #<print_screen
|
|
sta.z print_line_cursor
|
|
lda #>print_screen
|
|
sta.z print_line_cursor+1
|
|
jsr print_ln
|
|
lda.z print_line_cursor
|
|
sta.z print_char_cursor
|
|
lda.z print_line_cursor+1
|
|
sta.z print_char_cursor+1
|
|
// print_str("$4004=")
|
|
lda #<str1
|
|
sta.z print_str.str
|
|
lda #>str1
|
|
sta.z print_str.str+1
|
|
jsr print_str
|
|
// print_uchar(*(char *)0x4004)
|
|
ldx $4004
|
|
jsr print_uchar
|
|
// print_ln()
|
|
jsr print_ln
|
|
// }
|
|
rts
|
|
.segment Data
|
|
str: .text "$0000="
|
|
.byte 0
|
|
str1: .text "$4004="
|
|
.byte 0
|
|
}
|
|
.segment Code
|
|
// Clear the screen. Also resets current line/char cursor.
|
|
print_cls: {
|
|
// memset(print_screen, ' ', 1000)
|
|
jsr memset
|
|
// }
|
|
rts
|
|
}
|
|
// Print a zero-terminated string
|
|
// void print_str(__zp(2) char *str)
|
|
print_str: {
|
|
.label str = 2
|
|
__b1:
|
|
// while(*str)
|
|
ldy #0
|
|
lda (str),y
|
|
cmp #0
|
|
bne __b2
|
|
// }
|
|
rts
|
|
__b2:
|
|
// print_char(*(str++))
|
|
ldy #0
|
|
lda (str),y
|
|
jsr print_char
|
|
// print_char(*(str++));
|
|
inc.z str
|
|
bne !+
|
|
inc.z str+1
|
|
!:
|
|
jmp __b1
|
|
}
|
|
// Print a char as HEX
|
|
// void print_uchar(__register(X) char b)
|
|
print_uchar: {
|
|
// b>>4
|
|
txa
|
|
lsr
|
|
lsr
|
|
lsr
|
|
lsr
|
|
// print_char(print_hextab[b>>4])
|
|
tay
|
|
lda print_hextab,y
|
|
// Table of hexadecimal digits
|
|
jsr print_char
|
|
// b&0xf
|
|
lda #$f
|
|
axs #0
|
|
// print_char(print_hextab[b&0xf])
|
|
lda print_hextab,x
|
|
jsr print_char
|
|
// }
|
|
rts
|
|
}
|
|
// Print a newline
|
|
print_ln: {
|
|
__b1:
|
|
// print_line_cursor + 0x28
|
|
lda #$28
|
|
clc
|
|
adc.z print_line_cursor
|
|
sta.z print_line_cursor
|
|
bcc !+
|
|
inc.z print_line_cursor+1
|
|
!:
|
|
// while (print_line_cursor<print_char_cursor)
|
|
lda.z print_line_cursor+1
|
|
cmp.z print_char_cursor+1
|
|
bcc __b1
|
|
bne !+
|
|
lda.z print_line_cursor
|
|
cmp.z print_char_cursor
|
|
bcc __b1
|
|
!:
|
|
// }
|
|
rts
|
|
}
|
|
// Copies the character c (an unsigned char) to the first num characters of the object pointed to by the argument str.
|
|
// void * memset(void *str, char c, unsigned int num)
|
|
memset: {
|
|
.const c = ' '
|
|
.const num = $3e8
|
|
.label str = print_screen
|
|
.label end = str+num
|
|
.label dst = 2
|
|
lda #<str
|
|
sta.z dst
|
|
lda #>str
|
|
sta.z dst+1
|
|
__b1:
|
|
// for(char* dst = str; dst!=end; dst++)
|
|
lda.z dst+1
|
|
cmp #>end
|
|
bne __b2
|
|
lda.z dst
|
|
cmp #<end
|
|
bne __b2
|
|
// }
|
|
rts
|
|
__b2:
|
|
// *dst = c
|
|
lda #c
|
|
ldy #0
|
|
sta (dst),y
|
|
// for(char* dst = str; dst!=end; dst++)
|
|
inc.z dst
|
|
bne !+
|
|
inc.z dst+1
|
|
!:
|
|
jmp __b1
|
|
}
|
|
// Print a single char
|
|
// void print_char(__register(A) char ch)
|
|
print_char: {
|
|
// *(print_char_cursor++) = ch
|
|
ldy #0
|
|
sta (print_char_cursor),y
|
|
// *(print_char_cursor++) = ch;
|
|
inc.z print_char_cursor
|
|
bne !+
|
|
inc.z print_char_cursor+1
|
|
!:
|
|
// }
|
|
rts
|
|
}
|
|
.segment Data
|
|
print_hextab: .text "0123456789abcdef"
|
|
files: .fill 2*$a, 0
|