Fix layout flags for types that have oddly sized primitive type fields #58435
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vtjnash
reviewed
May 16, 2025
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The primitive type is fine on it's own. This only happens when it's on a field, caused by #38126 |
gbaraldi
added
backport 1.10
3 tasks
Seelengrab
reviewed
May 16, 2025
Theoretically we should be able to do this (but it will need very careful testing) |
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This might also fix #49318, come to think of it 🤔 The symptoms are very closely related, I think. |
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Does this fix #42326 too? |
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I can confirm that this PR fixes the inconsistent padding claims in #49318! The struct still ends up larger than technically necessary, but at least the padding claims are correct now. (of course, that shouldn't hold up this PR!)
Both on this PR & 1.12-beta I get on x86_64, so I don't think this PR has an influence. |
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Ah, right, Gabriel mentioned at #42326 (comment) that LLVM 18 may have fixed that issue, and I even later confirmed that |
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I marked this PR to close #49362 since it'd solve the same issue (and that PR is stuck). Are there any tests from that PR that are worth incorporating here? |
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#49362 is not quite the same, as that PR (I think) deals with |
Co-authored-by: Sukera <[email protected]>
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The padding is necessary for ABI reasons, we assume that a type like that is aligned to 16 bytes, so if it uses slightly more than 16 we go to 32. There are compelling reasons for that, like being able to ignore the existing bytes there when doing a store for example |
giordano
reviewed
May 16, 2025
KristofferC
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May 20, 2025
#58435) This is caused because for LLVMs sake we have to say that the oddly typed field is smaller than it actually is. (I wonder if we could represent it as an iN field in a struct and have it work but the result would be the same for now) Fix #58434, fix #49318, close #49362. --------- Co-authored-by: Mosè Giordano <[email protected]> Co-authored-by: Sukera <[email protected]> (cherry picked from commit 1b0b028)
58 tasks
This was referenced Jun 4, 2025
Merged
KristofferC
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that referenced
this pull request
Jun 25, 2025
#58435) This is caused because for LLVMs sake we have to say that the oddly typed field is smaller than it actually is. (I wonder if we could represent it as an iN field in a struct and have it work but the result would be the same for now) Fix #58434, fix #49318, close #49362. --------- Co-authored-by: Mosè Giordano <[email protected]> Co-authored-by: Sukera <[email protected]> (cherry picked from commit 1b0b028)
KristofferC
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Jun 25, 2025
65 tasks
DilumAluthge
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Sep 5, 2025
Backported PRs: - [x] #54840 <!-- Add boundscheck in speccache_eq to avoid OOB access due to data race --> - [x] #42080 <!-- recommend explicit `using Foo: Foo, ...` in package code (was: "using considered harmful") --> - [x] #58127 <!-- [DOC] Update installation docs: /downloads/ => /install/ --> - [x] #58202 <!-- [release-1.11] malloc: use jl_get_current_task to fix null check --> - [x] #58584 <!-- Make `Ptr` values static-show w/ type-information --> - [x] #58637 <!-- Make late gc lower handle insertelement of alloca use. --> - [x] #58837 <!-- fix null comparisons for non-standard address spaces --> - [x] #57826 <!-- Add a `similar` method for `Type{<:CodeUnits}` --> - [x] #58293 <!-- fix trailing indices stackoverflow in reinterpreted array --> - [x] #58887 <!-- Pkg: Allow configuring can_fancyprint(io::IO) using IOContext --> - [x] #58937 <!-- Fix nthreadpools size in JLOptions --> - [x] #58978 <!-- Fix precompilepkgs warn loaded setting --> - [x] #58998 <!-- Bugfix: Use Base.aligned_sizeof instead of sizeof in Mmap.mmap --> - [x] #59120 <!-- Fix memory order typo in "src/julia_atomics.h" --> - [x] #59170 <!-- Clarify and enhance confusing precompile test --> Need manual backport: - [ ] #56329 <!-- loading: clean up more concurrency issues --> - [ ] #56956 <!-- Add "mea culpa" to foreign module assignment error. --> - [ ] #57035 <!-- linux: workaround to avoid deadlock inside dl_iterate_phdr in glibc --> - [ ] #57089 <!-- Block thread from receiving profile signal with stackwalk lock --> - [ ] #57249 <!-- restore non-freebsd-unix fix for profiling --> - [ ] #58011 <!-- Remove try-finally scope from `@time_imports` `@trace_compile` `@trace_dispatch` --> - [ ] #58062 <!-- remove unnecessary edge from `exp_impl` to `pow` --> - [ ] #58157 <!-- add showing a string to REPL precompile workload --> - [ ] #58209 <!-- Specialize `one` for the `SizedArray` test helper --> - [ ] #58108 <!-- Base.get_extension & Dates.format made public --> - [ ] #58356 <!-- codegen: remove readonly from abstract type calling convention --> - [ ] #58415 <!-- [REPL] more reliable extension loading --> - [ ] #58510 <!-- Don't filter `Core` methods from newly-inferred list --> - [ ] #58110 <!-- relax dispatch for the `IteratorSize` method for `Generator` --> - [ ] #58965 <!-- Fix `hygienic-scope`s in inner macro expansions --> - [ ] #58971 <!-- Fix alignment of failed precompile jobs on CI --> - [ ] #59066 <!-- build: Also pass -fno-strict-aliasing for C++ --> Contains multiple commits, manual intervention needed: - [ ] #55877 <!-- fix FileWatching designs and add workaround for a stat bug on Apple --> - [ ] #56755 <!-- docs: fix scope type of a `struct` to hard --> - [ ] #57809 <!-- Fix fptrunc Float64 -> Float16 rounding through Float32 --> - [ ] #57398 <!-- Make remaining float intrinsics require float arguments --> - [ ] #56351 <!-- Fix `--project=@script` when outside script directory --> - [ ] #57129 <!-- clarify that time_ns is monotonic --> - [ ] #58134 <!-- Note annotated string API is experimental in Julia 1.11 in HISTORY.md --> - [ ] #58401 <!-- check that hashing of types does not foreigncall (`jl_type_hash` is concrete evaluated) --> - [ ] #58435 <!-- Fix layout flags for types that have oddly sized primitive type fields --> - [ ] #58483 <!-- Fix tbaa usage when storing into heap allocated immutable structs --> - [ ] #58512 <!-- Make more types jl_static_show readably --> - [ ] #58012 <!-- Re-enable tab completion of kwargs for large method tables --> - [ ] #58683 <!-- Add 0 predecessor to entry basic block and handle it in inlining --> - [ ] #59112 <!-- Add builtin function name to add methods error --> Non-merged PRs with backport label: - [ ] #59329 <!-- aotcompile: destroy LLVM context after serializing combined module --> - [ ] #58848 <!-- Set array size only when safe to do so --> - [ ] #58535 <!-- gf.c: include const-return methods in `--trace-compile` --> - [ ] #58038 <!-- strings/cstring: `transcode`: prevent Windows sysimage invalidation --> - [ ] #57604 <!-- `@nospecialize` for `string_index_err` --> - [ ] #57366 <!-- Use ptrdiff_t sized offsets for gvars_offsets to allow large sysimages --> - [ ] #56890 <!-- Enable getting non-boxed LLVM type from Julia Type --> - [ ] #56823 <!-- Make version of opaque closure constructor in world --> - [ ] #55958 <!-- also redirect JL_STDERR etc. when redirecting to devnull --> - [ ] #55956 <!-- Make threadcall gc safe --> - [ ] #55534 <!-- Set stdlib sources as read-only during installation --> - [ ] #55499 <!-- propagate the terminal's `displaysize` to the `IOContext` used by the REPL --> - [ ] #55458 <!-- Allow for generically extracting unannotated string --> - [ ] #55457 <!-- Make AnnotateChar equality consider annotations --> - [ ] #55220 <!-- `isfile_casesensitive` fixes on Windows --> - [ ] #53957 <!-- tweak how filtering is done for what packages should be precompiled --> - [ ] #51479 <!-- prevent code loading from lookin in the versioned environment when building Julia --> - [ ] #50813 <!-- More doctests for Sockets and capitalization fix --> - [ ] #50157 <!-- improve docs for `@inbounds` and `Base.@propagate_inbounds` --> --------- Co-authored-by: Kiran Pamnany <[email protected]> Co-authored-by: adienes <[email protected]> Co-authored-by: Gabriel Baraldi <[email protected]> Co-authored-by: Keno Fischer <[email protected]> Co-authored-by: Simeon David Schaub <[email protected]> Co-authored-by: Jameson Nash <[email protected]> Co-authored-by: Alex Arslan <[email protected]> Co-authored-by: Fons van der Plas <[email protected]> Co-authored-by: Ian Butterworth <[email protected]> Co-authored-by: JonasIsensee <[email protected]> Co-authored-by: Curtis Vogt <[email protected]> Co-authored-by: Dilum Aluthge <[email protected]> Co-authored-by: DilumAluthgeBot <[email protected]> Co-authored-by: DilumAluthge <[email protected]>
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This is caused because for LLVMs sake we have to say that the oddly typed field is smaller than it actually is. (I wonder if we could represent it as an iN field in a struct and have it work but the result would be the same for now)
Fix #58434, fix #49318, close #49362.