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POWhy is the CLR's jmp instruction unverifiable?
 

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  1. POWhy is the CLR's jmp instruction unverifiable?
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    1. This table or related slice is empty.
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      1. POWhy is the CLR's jmp instruction unverifiable?
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      1. POWhy is the CLR's jmp instruction unverifiable?
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    1. COWould this be because it could not verify the impact of execution of the current partially code block then stitched to the destination code block ... Something about stacks / heap tracking seems to flag in my little dreamworld ... not that I know this for sure though ... however that is immediatly offset by the information here ... http://msdn.microsoft.com/en-us/library/system.reflection.emit.opcodes.jmp.aspx ... which clearly states that no stack information is tracked / transferred. Maybe there's something underneath the "front end" that goes on here that Microsoft is hiding.
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      1. POWhy is the CLR's jmp instruction unverifiable?
      1. USWar
    2. COI don't know why it's unverifiable, but I do have an interesting piece of info. Our EQATEC Profiler collects anonymous statistics about all the code it profiles (using EQATEC Analytics, btw). Because jmp was tricky and not handled optimally by the profiler we decided to track how often it actually occurred. We now have 2 years of data, collected from over 1 million profiled assemblies, totalling 20 billion CIL instructions. Quite a lot. And how many were jmp? None! Yes, a jmp has never occurred in any of our user's apps (NETCF, SL, WP7, F# etc). Quite a surprise.
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      1. POWhy is the CLR's jmp instruction unverifiable?
      1. USRichard Flamsholt
    3. COI'm not too surprised actually. No compiler I know of except perhaps managed C++ emits the jmp instruction, because it's unverifiable. Any uses of jmp might be squirreled away in the trusted class libraries.
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