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maskelihileci
Cheater
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Joined: 08 Oct 2016
Posts: 43
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 Posted: Thu Jun 16, 2022 9:14 pm Post subject: I Need Performance |
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My goal is to list all the vtable addresses of a game and write a plugin on it.
But I am having performance problems.
The cheat engine is starting a new thread for each scan. I think this is a performance loss.
Do you think a touch can be made to the code below that will increase its performance?
| Code: |
function scannames()
s=createMemScan()
s.firstScan(soExactValue, vtString, rtRounded, '.?AV', '', getAddress(process) ,getAddress(process)+getAddress(getModuleSize(process)) ,"*W*X*C" ,fsmNotAligned ,'1' ,false ,true, false, true);
s.waitTillDone()
fl=createFoundList(s)
names={}
fl.initialize()
sll=createStringList()
for i=1,fl.Count do
local a=tonumber(fl[i-1],16)
names[i]={}
names[i].name=readString(tonumber(fl[i-1],16)+4)
names[i].address=a-0x10
sll.add(names[i].name)
end
end
scannames()
for r=1,fl.Count do
if (r==-1) then return end
a=names[r+1].address
if targetIs64Bit() then
a=a-getAddress(process)
end
s=createMemScan() --- missing code
fl.deinitialize()
s.firstScan(soExactValue, vtDword, rtRounded, string.format("%x",a), '', getAddress(process) ,getAddress(process)+getAddress(getModuleSize(process)) ,"*W*X*C" ,fsmAligned ,'4' ,true ,true, false, true);
s.waitTillDone()
fl=createFoundList(s) --- missing code
fl.initialize()
RTTIInfo={}
for i=1,fl.Count do
local a=tonumber(fl[i-1],16)
a=a-12
if readBytes(a,1)==1 then
table.insert(RTTIInfo,a)
end
end
if targetIs64Bit() then
scantype=vtQword
pointersize=8
else
scantype=vtDword
pointersize=4
end
vtables={}
for i=1,#RTTIInfo do
a=RTTIInfo[i]
fl.deinitialize()
s.firstScan(soExactValue, scantype, rtRounded, string.format("%x",a), '', getAddress(process) ,getAddress(process)+getAddress(getModuleSize(process)) ,"*W*X*C" ,fsmAligned ,'4' ,true ,true, false, true);
s.waitTillDone()
fl.initialize()
for j=1,fl.Count do
table.insert(vtables, tonumber(fl[j-1],16)+pointersize)
end
end
instances={}
for i=1,#vtables do
a=vtables[i]
fl.deinitialize()
s.firstScan(soExactValue, scantype, rtRounded, string.format("%x",a), '', 0 ,0xffffffffffffffff ,"*W*X*C" ,fsmAligned ,'4' ,true ,true, false, true);
s.waitTillDone()
fl.initialize()
for j=1,fl.Count do
table.insert(instances, tonumber(fl[j-1],16))
end
end
for i=1,#instances do
print(sll[r])
print(string.format("%x",instances[i])) -- adress class
end
end
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ParkourPenguin
I post too much
 Reputation: 140
Joined: 06 Jul 2014
Posts: 4293
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| Posted: Fri Jun 17, 2022 12:03 am Post subject: |
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I started reading your code (after using a tool to format it), but gave up shortly after the end of the first function. Mutable global state is bad (use local variables), the first function shouldn't even be a function, and there's code that's completely pointless (`if (r==-1) ...`: `r` will never be -1 because fl.Count is unsigned).
Using better protection flags will make scans faster ("*W*X*C" is almost always unnecessary).
You're leaking memscans every time you call createMemScan after the first call.
Maybe think about memoizing scans to not repeat work.
Likely other stuff.
No clue what algorithm you're using to identify vtables.
_________________
I don't know where I'm going, but I'll figure it out when I get there. |
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maskelihileci
Cheater
![]() Reputation: 0
Joined: 08 Oct 2016
Posts: 43
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| Posted: Fri Jun 17, 2022 10:18 am Post subject: |
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| ParkourPenguin wrote: | I started reading your code (after using a tool to format it), but gave up shortly after the end of the first function. Mutable global state is bad (use local variables), the first function shouldn't even be a function, and there's code that's completely pointless (`if (r==-1) ...`: `r` will never be -1 because fl.Count is unsigned).
Using better protection flags will make scans faster ("*W*X*C" is almost always unnecessary).
You're leaking memscans every time you call createMemScan after the first call.
Maybe think about memoizing scans to not repeat work.
Likely other stuff.
No clue what algorithm you're using to identify vtables. |
Here I want the for loop to continue until the end
It stops after giving an error but it seems like I have no other choice because I don't know how many results are in the list.
If I knew how many results were in the list, I could try to compare with it.
createMemScan When I don't use it, no results can be found.
https://forum.cheatengine.org/viewtopic.php?t=613639&sid=3a7b69de5c3b62d0db7619e66a3cad4d
A MemScan was created in the original dark byte code, but this does not yield any results.
I had to create more than one to get it to work, maybe there is a different solution.
You asked about the logic of the algorithm, it is explained in this topic.
https://framedsc.com/GeneralGuides/using_rtti.htm
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