Re: [omr-dev] Minimal FrontEnd.hpp extensions

["Mark Stoodley" <mstoodle@xxxxxxxxxx>]

I believe those functions come from an
aborted attempt to implement stack maps and method meta
data for a prototype CPython JIT that
has never been open sourced (you can "tell" by references to
"pyatlas" and such things.
The idea is analogous to the stack maps used in the JVM to describe which
local variables and registers hold live
object references at calls or any other code location that could
be interrupted by a GC (yes, I realize
that's something of a strange thing to talk about in the context
of the reference counting CPython runtime).

I don't believe this code is needed
anymore, though we will certainly want something like it for
supporting garbage collected languages
in future. At a minimum, I think it's safe for you to ignore
it.

I think Daryl Maier was the original
author. Daryl, is there any reason to keep this code at this point ?

Mark Stoodley		8200 Warden Avenue
Senior Software Developer		Markham, L6G 1C7
IBM Runtime Technologies		Canada
Phone:	+1-905-413-5831
e-mail:	mstoodle@xxxxxxxxxx
We cannot solve our problems with the same thinking we used when we created them - Albert Einstein

From:      
 Dibyendu Majumdar <mobile@xxxxxxxxxxxxxxx>
To:      
 omr developer discussions
<omr-dev@xxxxxxxxxxx>
Date:      
 2018/06/01 04:45 PM
Subject:    
   [omr-dev] Minimal
FrontEnd.hpp extension
Sent by:    
   omr-dev-bounces@xxxxxxxxxxx

---

Hi,

I am looking at the FrontEnd.hpp files in testcompiler and JitBuilder
projects. I am trying to understand what following are for - and if
they are needed.

   void encodeStackMap(
      TR_GCStackMap *map,
      uint8_t *location,
      bool encodeFourByteOffsets,
      uint32_t bytesPerStackMap,
      TR::Compilation *comp);

   bool mapsAreIdentical(
      TR_GCStackMap *mapCursor,
      TR_GCStackMap *nextMapCursor,
      TR::GCStackAtlas *stackAtlas,
      TR::Compilation *comp);

   uint8_t *createStackAtlas(
      bool encodeFourByteOffsets,
      uint32_t numberOfSlotsMapped,
      uint32_t bytesPerStackMap,
      uint8_t *encodedAtlasBaseAddress,
      uint32_t atlasSizeInBytes,
      TR::Compilation *comp);

   uint32_t
      calculateSizeOfStackAtlas(
      bool encodeFourByteOffsets,
      uint32_t numberOfSlotsMapped,
      uint32_t bytesPerStackMap,
      TR::Compilation *comp);

Thanks and Regards
Dibyendu
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