olcott
2024-10-18 14:10:04 UTC
_DDD()
[00002172] 55 push ebp ; housekeeping
[00002173] 8bec mov ebp,esp ; housekeeping
[00002175] 6872210000 push 00002172 ; push DDD
[0000217a] e853f4ffff call 000015d2 ; call HHH(DDD)
[0000217f] 83c404 add esp,+04
[00002182] 5d pop ebp
[00002183] c3 ret
Size in bytes:(0018) [00002183]
When DDD is correctly emulated by HHH according
to the semantics of the x86 language DDD cannot
possibly reach its own machine address [00002183]
no matter what HHH does.
+-->[00002172]-->[00002173]-->[00002175]-->[0000217a]--+
+------------------------------------------------------+
That may not line up that same way when view
https://en.wikipedia.org/wiki/State_diagram
Except that 0000217a doesn't go to 00002172, but to 000015d2[00002172] 55 push ebp ; housekeeping
[00002173] 8bec mov ebp,esp ; housekeeping
[00002175] 6872210000 push 00002172 ; push DDD
[0000217a] e853f4ffff call 000015d2 ; call HHH(DDD)
[0000217f] 83c404 add esp,+04
[00002182] 5d pop ebp
[00002183] c3 ret
Size in bytes:(0018) [00002183]
When DDD is correctly emulated by HHH according
to the semantics of the x86 language DDD cannot
possibly reach its own machine address [00002183]
no matter what HHH does.
+-->[00002172]-->[00002173]-->[00002175]-->[0000217a]--+
+------------------------------------------------------+
That may not line up that same way when view
https://en.wikipedia.org/wiki/State_diagram
What is the first machine address of DDD that HHH
emulating itself emulating DDD would reach?
The Emulating HHH sees those addresses at its begining and then never
again.
Then the HHH that it is emulating will see those addresses, but not the
outer one that is doing that emulation of HHH.
Then the HHH that the second HHH is emulating will, but neither of the
outer 2 HHH.
And so on.
Which HHH do you think EVER gets back to 00002172?
What instruction do you think that it emulates that would tell it to do so?
It isn't the call instruction at 0000217a, as that tells it to go into HHH.
00002172
00002173
00002175
0000217a
conditional emulation of 00002172
conditional emulation of 00002173
conditional emulation of 00002175
conditional emulation of 0000217a
CE of CE of 00002172
...
The "state" never repeats, it is alway a new state,
Every emulated DDD has an identical process state at every pointin its emulation trace when adjusting for different top of stack values.
and if HHH decides
to abort its emulation, it also should know that every level of
condition emulation it say will also do the same thing,
If I understand his words correctly Mike has already disagreedto abort its emulation, it also should know that every level of
condition emulation it say will also do the same thing,
with this. Let's see if you can understand my reasoning.
Not exactly. Each HHH can only abort its emulation when its
abort criteria has been met. The outermost HHH can see one
more execution trace than the next inner one thus meets its
abort criteria first.
Obviously a simulator has access to the internal state
(tape contents etc.) of the simulated machine. No problem
there.
This seems to indicate that the Turing machine UTM version of(tape contents etc.) of the simulated machine. No problem
there.
HHH can somehow see each of the state transitions of the DDD
resulting from emulating its own Turing machine description
emulating DDD.
Even though this is a little different for Turing machines it
is equivalent in essence to HHH being able to see the steps of
the DDD resulting from HHH emulating itself emulating this DDD.
*Joes can't seem to understand this*
Only the outer-most HHH meets its abort criteria first, thus
unless it aborts as soon as it meets this criteria none of
them will ever abort.
and thus the
call HHH at 0000217a will be returned from, > and HHH has no idea what
will happen after that, so it KNOWS it is ignorant of the answer.
That you don't quite yet understand the preceding pointscall HHH at 0000217a will be returned from, > and HHH has no idea what
will happen after that, so it KNOWS it is ignorant of the answer.
will make it impossible for you to understand any reply
to the above point.
--
Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer
Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer