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From: "Fred. Zwarts" <F.Zwarts@HetNet.nl>
Newsgroups: comp.theory
Subject: Re: The actual code of HHH
Date: Thu, 27 Feb 2025 10:26:34 +0100
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Op 27.feb.2025 om 00:09 schreef olcott:
> On 2/26/2025 3:52 PM, joes wrote:
>> Since there is so much talk around, but not really about it,
>> let's take a look:
>> https://github.com/plolcott/x86utm/blob/
>> 48b4cbfeb3f486507276a5fc4e9b10875ab24dbf/Halt7.c#L1081
>> In line 1137, we compute a flag:
>> u32 Root = Init_Halts_HH(&Aborted, &execution_trace, &decoded, &code_end,
>> (u32)P, &master_state, &slave_state, &slave_stack);
>> In line 918, we find it basically checks for the magic number
>> **execution_trace==0x90909090. What is this unexplained value?
>>
>> We then pass the saved flag in line 1143:
>> if (Decide_Halting_HH(&Aborted, &execution_trace, &decoded,
>> code_end, End_Of_Code, &master_state, &slave_state, &slave_stack, Root)),
>> defined in line 1030.
>> Then we get a switch:
>> 1059    if (Root)  // Master UTM halt decider
>> Line 1070 is then conditionally skipped:
>> Needs_To_Be_Aborted_HH((Decoded_Line_Of_Code*)**execution_trace);
>> defined in line 1012, which (on a jmp or call instruction) calls
>> u32 Needs_To_Be_Aborted_Trace_HH(Decoded_Line_Of_Code* execution_trace,
>>                                   Decoded_Line_Of_Code *current)
>> in line 964, where the abort logic lives. (It basically triggers
>> on a call or jump to itself.)
>>
>> So we only abort depending on the address of the execution trace.
>> This makes no sense. Why is that?
>>
> 
> DD emulated by HHH according to the behavior that the x86
> machine code of DD cannot possibly terminate normally thus
> HHH is infallibly correct to report that this DD emulated
> by HHH (not any other DD in the whole freaking universe)
> is not-terminating.
No, it is correct to report that HHH is unable to correctly simulate 
this halting program up to its end.