Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://github.com/python/cpython/issues/115869 below:

Hosting `jit_stencils.h` · Issue #115869 · python/cpython · GitHub

While this is probably desirable, I'm not quite sure if it's feasible. With that said, several people (@vstinner at the sprint and @zooba during PR review) both expressed a desire to remove the LLVM build-time dependency for JIT builds. Let's have that conversation here.

When building CPython with the JIT enabled, LLVM 16LLVM 18 is used to compile Tools/jit/template.c many times, and process the resulting object files into a file called jit_stencils.h in the build directory.

Because this file depends on Python.h (and thus pyconfig.h and many build-specific configuration options, including things like _DEBUG/NDEBUG/Py_DEBUG/etc.) and contains binary code, it is probably most useful to think of jit_stencils.h as a binary extension module.

If we could build, host, and manage compiled versions of, say, itertoolsmodule.c somewhere and have it work correctly for those who need it, then such a scheme would probably work for jit_stencils.h.

• Can this be done in a way that actually works correctly and is worth the trouble (the status quo being "download LLVM 18 if you want to build the JIT").
• Should we just try to host these for the most common build configurations? Or "everything"?
• Should all platforms be in one file (with each platform guarded by #ifdefs), or many files?
• Should these files be checked in? Or hosted somewhere? Who/what builds them? How often?
• Does this introduce any new attack vectors?
• What should the workflow look like for:
  • ...those developing the JIT?
  • ...those changing header files that the JIT depends on?
  • ...those building CPython with a JIT from a random commit?
  • ...those building CPython with a JIT from a release tag?

• GH-115869: Make jit_stencils.h reproducible #127166
• GH-115869: Reference implementation for hosting JIT stencils #129331
• GH-115869: Don't JIT zeroed bytes #130023

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4