[oscardssmith]

irgen sanitizes the names of defined functions (julia_f+_0 becomes julia_f__0) after compile_method_instance has recorded them in compiled. The entries for those functions then named functions that no longer exist in the module, on every Julia version.

From Julia 1.14, which numbers functions per compilation, sanitized names also collide: julia_+_0 and julia_-_0 both become julia___0. LLVM uniquifies the second one as julia___0.1, which is not a safe name. Consumers that sanitize compiled names themselves, like Enzyme's prepare_llvm, then look up julia___0_1 and miss the function. On main, both entries resolve to the same function instead.

This PR picks a free _N suffix when a sanitized name is taken, and updates compiled with the names actually given. The new test compiles two callees whose names collide after sanitizing. It checks that every name in compiled exists in the module, is safe and distinct, and refers to the right function. It fails on main on 1.13 and 1.14.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.48%. Comparing base (45e224f) to head (4e4bcdc).

Files with missing lines	Patch %	Lines
src/irgen.jl	81.81%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1081       +/-   ##
===========================================
- Coverage   92.86%   76.48%   -16.39%     
===========================================
  Files          31       31               
  Lines        7775     7564      -211     
===========================================
- Hits         7220     5785     -1435     
- Misses        555     1779     +1224     

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