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VFP 9.0 FIX - ASTACKINFO() Function
January 2020
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CCB
1. BUG:
In vfp9 (and vfp7, vfp8), the ASTACKINFO() function can not return the call stack information for the ON statements,
for example, ON ERROR, ON KEY LABEL, ON SELECTION, etc.
The bug was reported by Tomas Tamm.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label65a785 ::
;
; -------------------------------------------------
; VFP 9.0 FIX - ASTACKINFO() Function
; November 2017
; -------------------------------------------------
; CCB
;
; Returns the call stack information for the ON statements (ON ERROR, ON KEY LABEL, ON SELECTION, etc.).
;
; 2017/11/29, by ccb
;
; test byte ptr [ ebx + 28 ] , 0Ah ;0x0065a785 : f6431c0a
; jne Label65aaf3 ;0x0065a789 : 0f8564030000
cmp ebx , dword ptr [ Data9370e8 ] ;0x0065a78f : 3b1de8709300
jne Label65a79c ;0x0065a795 : 7505
mov ebx , offset Data93e6f0 ;0x0065a797 : bbf0e69300
Label65a79c ::
inc dword ptr [ ebp + 0FFFFFD24h ] ;0x0065a79c : ff8524fdffff
mov eax , dword ptr [ ebp + 0FFFFFD24h ] ;0x0065a7a2 : 8b8524fdffff
inc dword ptr [ ebp + 0FFFFFD08h ] ;0x0065a7a8 : ff8508fdffff
push esi ;0x0065a7ae : 56
lea edx , dword ptr [ ebp + 0FFFFFCFCh ] ;0x0065a7af : 8d95fcfcffff
lea ecx , dword ptr [ ebp + 0FFFFFF48h ] ;0x0065a7b5 : 8d8d48ffffff
mov byte ptr [ ebp + 0FFFFFF48h ] , 049h ;0x0065a7bb : c68548ffffff49
mov dword ptr [ ebp + 0FFFFFF4Ch ] , 0Ah ;0x0065a7c2 : c7854cffffff0a000000
mov dword ptr [ ebp + 0FFFFFF54h ] , eax ;0x0065a7cc : 898554ffffff
call Fun52bf26 ;0x0065a7d2 : e84f17edff
mov eax , dword ptr [ebx] ;0x0065a7d7 : 8b03
lea edx , dword ptr [ ebp + 0FFFFFD34h ] ;0x0065a7d9 : 8d9534fdffff
call Fun527b20 ;0x0065a7df : e83cd3ecff
lea eax , dword ptr [ ebp + 0FFFFFD34h ] ;0x0065a7e4 : 8d8534fdffff
mov dword ptr [ ebp + 0FFFFFF4Ch ] , esi ;0x0065a7ea : 89b54cffffff
mov byte ptr [ ebp + 0FFFFFF48h ] , 048h ;0x0065a7f0 : c68548ffffff48
lea esi , dword ptr [ eax + 1 ] ;0x0065a7f7 : 8d7001
4. APPLIES TO:
VFP 7.0.0.9262
VFP 7.0.0.9465 (SP1)
VFP 8.0.0.2521
VFP 8.0.0.3117 (SP1)
VFP 9.0.0.2412
VFP 9.0.0.3504 (SP1)
VFP 9.0.0.4611 (SP2)
VFP 9.0.0.5015 (SP2)
VFP 9.0.0.5411 (SP2)
VFP 9.0.0.5721 (SP2)
VFP 9.0.0.5815 (SP2)
VFP 9.0.0.6303 (SP2)
VFP 9.0.0.6602 (SP2)
VFP 9.0.0.7423 (SP2)
The bug has been fixed in VFP Advanced.
5. REFERENCE WEBSITES:
1, baiyujia.com:
http://www.baiyujia.com
2, foxite.com:
https://www.foxite.com/archives/astackinfo-wrong-intermittently-0000398512.htm
6. OTHER:
For reference only, there is no guarantees.
Any questions or suggestions, please send me an email at ccb2000@163.com.
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