Cheat Engine

[panraven]

From https://forum.cheatengine.org/viewtopic.php?t=620717
I intent to make an extension to solve the reassemble problem,
next_rip https://pastebin.com/RrC0PfWb
but turn out new ce can do it already, but then I extended to this one
aacomp.lua https://pastebin.com/bmfz6i88
this provide 1 aa command "COMP", and a custom assembler instruction 'FCOMP'.

[[[[[[[[[[[[[[[[[[[[[
NOTE: custom assembler currently can not emit zero bytes, so the fall back option is to emit 1 byte nop (0x90).
NOTE2:
for integer defined <symbol> (not FCOMP persist symbol), if want to use in <lua-expression> in following COMP or
custom FCOMP, it should be enclosed by [[<symbol>]] or [=[<symbol>]=] or [==[<symbol>]==] etc,
otherwise it will not be expanded, eg.
define(sym,666)
comp(Name,readInteger'sym') // lua readInteger see input parameter as 'sym'
comp(Name,readInteger[[sym]]) // lua readInteger see input parameter as '666'
]]]]]]]]]]]]]]]]]]]]]

In following <symbol> is string of following characters: . # @ _ and alphanum
--
COMP is a aa command to transform to 'DEFINE(<symbol>,<lua-calc-result>)' or just use the lua-side-effect.
ie.
COMP(<symbol>,<lua-expression>) or
COMP(<lua-expression>)

eg.
COMP(SymbolName,getCEVersion()) -> define(SymbolName,7.5)
or just use the side effect
COMP(showMessage'Hello') -> return empty line

--

FCOMP is a valid x86 instruction, but if it write like following format, then the custom assembler may take its effect,
FCOMP<optional-spcs>&<symbol>,<lua-expression>
--
The <lua-expression> must result in integer value <result>,
then depend on the name of <symbol>, <result> can be used in following instructions.
if <symbol> is one of '_' or 'rax;rbx;rcx;rdx;rsi;rdi;rbp;r11;r12;r13;r14;r15;'
then it is in ONE_OFF_mode, which <result> will only use in immediate next instruction (if not another custom fcomp),
the <symbol> matching register may use in this immediate next instruction, so it should be a known free register.
If <symbol> is '_' then no register is use, some instruction may not compile.

If <symbol> is otherwise, then it is in Persist_mode, then <symbol> use as key to store <result>, then if matching &<symbol>
find in following instruction, it will replace with <result >(integer in hex format), however, if &<symbol> already has
a value, the <lua-expression> will not be run to replace <result>. To force a refresh in this case, run a lua function
forget_fcomp(<symbol>) first, or in AA context:
COMP(forget_fcomp'NEW_VALUE') // note no & prefix.

Because <symbol> cannot specify in ce reassemble, so the ONE_OFF_mode is need.

------
the following is an example aa script with its result (copy from pastebin)
Use a 64bit ce to attached another 64bit ce may compile the script.