[M3devel] frame per procedure instead of frame per TRY?

Jay jay.krell at cornell.edu
Sun Jul 19 19:46:36 CEST 2015

NT/amd64 & likely all NT architectures except x86: The pdata gives function boundaries and the xdata provides information to restore nonvolatile registers, including rsp and return address. Locals may be enregistered across function calls in nonvolatile registers. 

There is no linked list.
There is a reliable stack walker including restoring nonvolatile registers provided by ther operating system (RtlUnwind, RtlVirtualUnwind).

 - Jay

On Jul 19, 2015, at 5:02 AM, Elmar Stellnberger <estellnb at elstel.org> wrote:

> Am 2015-07-19 um 12:19 schrieb Jay K:
>> And all the other NT platforms are faster.
>> They don't link/unlink anything.
>> They have metadata describing prologs.
>> The runtime can use that to restore nonvolatile registers (including
>> the stack) at any point.
> including NT-AMD64 or not? - 
> but PowerPC, MIPS, Alpha, Itanium and ARM?
> interesting. What happens if I have a variable being kept in a register
> like register int x? These registers would still need to be saved as 
> a prolog could never tell us (i.e. we would then again need a linked 
> list) ...
> ... and then if we have prologues we would not need to pin down
> any word that could refer as a refany to the traced heap in our 
> locales area but only those which really do (The question is of
> course what data is in these prologues and what data is not.).
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