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[BUG/PRB.] VFP 9.0 FIX - PURGE CACHED VIRTUAL MEMORY IN THE SYS(1104) FUNCTION
January 2024
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CCB
1. BUG:
If we enable purging cached virtual memory in the SYS(1104) function in Visual FoxPro Advanced,
it will free more memory, and there is more available memory.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label60930a ::
cmp dword ptr [ ebp + 12 ] , 02h ;0x0060930a : 837d0c02
jne Label6093aa ;0x0060930e : 0f8596000000
and dword ptr [ ebp + 0FFFFD0ECh ] , 00h ;0x00609314 : 83a5ecd0ffff00
lea esi , dword ptr [ ebx + 44 ] ;0x0060931b : 8d732c
mov edi , esi ;0x0060931e : 8bfe
call Fun529a6e ;0x00609320 : e84907f2ff
cmp byte ptr [esi] , 049h ;0x00609325 : 803e49
je Label609367 ;0x00609328 : 743d
mov eax , esi ;0x0060932a : 8bc6
call Fun42371d ;0x0060932c : e8eca3e1ff
mov eax , dword ptr [ ebx + 52 ] ;0x00609331 : 8b4334
inc eax ;0x00609334 : 40
call Fun420d46 ;0x00609335 : e80c7ae1ff
mov eax , dword ptr [ ebx + 76 ] ;0x0060933a : 8b434c
mov eax , dword ptr [eax] ;0x0060933d : 8b00
mov ecx , dword ptr [ ebx + 52 ] ;0x0060933f : 8b4b34
mov byte ptr [ eax + ecx ] , 00h ;0x00609342 : c6040800
mov eax , dword ptr [ ebx + 76 ] ;0x00609346 : 8b434c
mov eax , dword ptr [eax] ;0x00609349 : 8b00
pushd 00h ;0x0060934b : 6a00
push eax ;0x0060934d : 50
call Fun432788 ;0x0060934e : e83594e2ff
cmp eax , 0FFFFFFFFh ;0x00609353 : 83f8ff
je Label609375 ;0x00609356 : 741d
mov edx , eax ;0x00609358 : 8bd0
call Fun531d42 ;0x0060935a : e8e389f2ff
test eax , eax ;0x0060935f : 85c0
je Label609375 ;0x00609361 : 7412
mov ecx , eax ;0x00609363 : 8bc8
jmp Label60936a ;0x00609365 : eb03
Label609367 ::
mov ecx , dword ptr [ ebx + 56 ] ;0x00609367 : 8b4b38
Label60936a ::
call Fun421627 ;0x0060936a : e8b882e1ff
mov dword ptr [ ebp + 0FFFFD0ECh ] , eax ;0x0060936f : 8985ecd0ffff
Label609375 ::
mov edi , dword ptr [ ebp + 0FFFFD0ECh ] ;0x00609375 : 8bbdecd0ffff
test edi , edi ;0x0060937b : 85ff
jne Label609389 ;0x0060937d : 750a
mov esi , 0385h ;0x0060937f : be85030000
call Fun452790 ;0x00609384 : e80794e4ff
Label609389 ::
mov eax , dword ptr [edi] ;0x00609389 : 8b07
mov esi , 0100h ;0x0060938b : be00010000
test dword ptr [ eax + 32 ] , esi ;0x00609390 : 857020
jne Label6093b4 ;0x00609393 : 751f
mov eax , dword ptr [eax] ;0x00609395 : 8b00
call Fun53b58b ;0x00609397 : e8ef21f3ff
test dword ptr [ eax + 44 ] , esi ;0x0060939c : 85702c
je Label6093b4 ;0x0060939f : 7413
mov esi , edi ;0x006093a1 : 8bf7
call Fun524ba6 ;0x006093a3 : e8feb7f1ff
jmp Label6093b4 ;0x006093a8 : eb0a
Label6093aa ::
mov eax , 07FFFFFFFh ;0x006093aa : b8ffffff7f
call Fun68507b ;0x006093af : e8c7bc0700
;
; -----------------------------------------------------------------------------
; VFP 9.0 FIX - PURGE CACHED VIRTUAL MEMORY IN THE SYS(1104) FUNCTION
; April 2021
; -----------------------------------------------------------------------------
; CCB
;
; Purge cached virtual memory in the SYS(1104) function.
;
; 2021/4/15, by ccb
;
cmp dword ptr vfpa_sys9057_data,00h
je Label6093b4
;; Purge Cached Virtual Memory
push esi
push ecx
lea esi , dword ptr [ esp ]
mov dword ptr [ esp ] , 07FFFFFFFh
call Fun7e0c91
pop ecx
pop esi
IF VFPA_VERSION GE 102
;; Purge Cached Large Memory
call vfpa_lmm_purgecachedmemory
ENDIF
IF VFPA_VERSION GE 102
;; Set Process Working Set Size for Large Memory
call vfpa_lmm_setprocessworkingsetsize
ENDIF
Label6093b4 ::
pushd 00h ;0x006093b4 : 6a00
pushd 00h ;0x006093b6 : 6a00
jmp Label4558d4 ;0x006093b8 : e917c5e4ff
4. APPLIES TO:
VFP 6.0.8167.0
VFP 6.0.8961.0 (SP5)
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
http://www.baiyujia.com/vfpdocuments/f_vfp9fix166.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix168.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix169.asp
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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