JuliaLang / julia
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codegen: LLVM 21 ThreadSafeContext and EHFrame compatibility (#61273)

## Summary

- Add `withContextDo` compatibility shim for `ThreadSafeContext` API
changes in LLVM 21 (which removes `getLock()`, `Lock`, and
`getContext()` in favor of callback-based `withContextDo`)
- Replace all manual lock/unlock patterns with scoped `withContextDo`
callbacks across `jitlayers.h`, `jitlayers.cpp`, `aotcompile.cpp`, and
`disasm.cpp`
- Add `JLEHFrameRegistrationPlugin` for LLVM 21+ (which removes
`jitlink::EHFrameRegistrar`), using JITLink allocation actions for EH
frame registration
- Debug asserts ensure `get_context()`/`get_module()` are only called
inside `withContextDo` scope
- Lock hierarchy respected: TSC locks released before
`addOutput()`/`R->replace()` which can trigger materialization

Supersedes #59946 and #60358, forward-porting those changes to current
master.

## Test plan

- [x] Builds and passes smoke test on LLVM 20
- [x] Builds and passes smoke test on LLVM 21 (tested with libLLVM
21.1.2 JLL)
- [ ] CI

This pull request was written with the assistance of generative AI
(Claude).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

There is quite a few whitespace changes so ignoring it is quite helpful

---------

Co-authored-by: yuyichao <yyc1992@gmail.com>
Co-authored-by: Sam Schweigel <sam.schweigel@juliahub.com>

63556 of 82757 relevant lines covered (76.8%)

23513117.84 hits per line

Relevant lines Covered
82757 RELEVANT LINES 63556 COVERED LINES
23513117.84 HITS PER LINE
Source Files on main

Recent builds

Builds Branch Commit Type Ran Committer Via Coverage
1639 main codegen: LLVM 21 ThreadSafeContext and EHFrame compatibility (#61273) ## Summary - Add `withContextDo` compatibility shim for `ThreadSafeContext` API changes in LLVM 21 (which removes `getLock()`, `Lock`, and `getContext()` in favor of callback-... push web-flow buildkite
76.8
1595 main SharedArrays: Skip a `finally` step if we throw before the `shmmem_create_pid` local is defined (#61141) In theory, if we throw on line 116 (e.g. if `getpid()` or `randstring()` throws), then we'll enter the `finally` block before we ever define ... push web-flow buildkite
76.82
1576 main Supporting sticky (generational) immix (#57327) Adding support for sticky immix. Needs to be merged after: - https://github.com/JuliaLang/julia/pull/57237 - https://github.com/JuliaLang/julia/pull/57176 - https://github.com/JuliaLang/julia/pull/... push web-flow buildkite
75.06
1574 main fix `detect_closure_boxes` to only consider active methods (#60929) Fixes #https://github.com/JuliaLang/julia/issues/60922 push web-flow buildkite
76.71
1572 main docs: clarify 'using A, B' semantics (#60856) Resolves #36090 push web-flow buildkite
76.68
1562 main Fix `@test_loweringerror` macro to return the `code` correctly. (#60598) for the PR #60556, the macro returns nothing so nothing has happened. --------- Co-authored-by: Claire Foster <aka.c42f@gmail.com> push web-flow buildkite
76.75
1560 main avoid some more `Core.Box` in Base and SharedArrays (#60599) push web-flow buildkite
76.71
1554 main [JuliaLowering] Fix-up always-defined check in `is_valid_body_ir_argument` (#60602) This was slightly mis-translated from the flisp side: ```scheme (define (valid-body-ir-argument? aval) (or (valid-ir-argument? aval) (and (sym... push web-flow buildkite
76.66
1551 main Fix typo in comment for pack8bools function (#60525) push web-flow buildkite
76.62
1545 main Clarify that `cpu_info` times are expressed in milliseconds (#60480) libuv reports times in milliseconds, but the Julia docs and show() use units of 1/Sys.SC_CLK_TCK which is 100 on my laptop. The mismatch might be due to libuv changeset https://... push web-flow buildkite
76.71
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