一如既往，主要在工具链领域耕耘。

llvm-project

I made 700+ commits this year. Many are clean-up commits or fixup for others' work. I hope that I can do more useful work next year.

• Enabled --features=layering_check for Bazel's llvm and clang projects
• Implemented LLVM_ENABLE_REVERSE_ITERATION for StringMap
• Added llvm::xxh3_64bits and adopted it in llvm/clang/lld
• Made AArch64 changes to msan and dfsan
• Made various improvements to the clang driver, including -### exit code, auxiliary files, errors for unsupported target-specific options, -fsanitize=kcfi, and XRay
• Made various sanitizer changes
• Made -fsanitize=function work for C and non-x86 architectures
• Fixed several major problems of assembler implementation of RISC-V linker relaxation
• clangSema: %lb recognization for printf/scanf, checking the failure memory order for atomic_compare_exchange-family built-in functions, -Wc++11-narrowing-const-reference
• llvm-objdump: @plt symbols for x86 .plt.got, mapping symbol improvements, --disassemble-symbols changes, etc
• Supported R_RISCV_SET_ULEB128/R_RISCV_SUB_ULEB128 for .uleb128 directives
• gcov: fix instrumentation crashes when using inline variables, #line, and #include, made llvm-cov gcov work with a smaller stack size
• LTO: fixed local ifunc for ThinLTO, reported errors when parsing module-level inline assembly
• CodeLayout: fixed a correctness bug and improved performance to be suitable for lld/ELF --call-graph-profile-sort=hfsort default

Reviewed many commits. A lot of people don't add a Reviewed By: tag. Anyway, counting commits with the tag can give an underestimate.

1
2

% git shortlog -sn 2679e8bba3e166e3174971d040b9457ec7b7d768...main --grep 'Reviewed .*MaskRay' | awk '{s+=$1}END{print s}'
395

Many GitHub pull requests are not counted.

I created a read-only archive of the LLVM phabricator instance.

lld/ELF

lld/ELF is quite stable. I have made some maintenance changes. As usual, I wrote the ELF port's release notes for the two releases. See lld 16 ELF changes and lld 17 ELF changes for detail.

I made some slides on how I improved the performance of lld/ELF.

psABI

I have made changes to x86-64, AArch64, and RISC-V psABI documents.

binutils

Reported many bugs and feature requests:

• ld: Should --gc-sections respect RHS of a symbol assignment?
• objcopy: add support for changing ELF symbol visibility
• rtld: resolve ifunc relocations after JUMP_SLOT/GLOB_DAT/etc
• ld riscv: --emit-relocs does not retain the original relocation type
• gas aarch64: GOT relocations referencing a local symbol should not be changed to reference STT_SECTION
• objcopy --set-section-flags: support toggling a flag
• gas x86: reject {call,jmp} [offset func] in Intel syntax

My commits:

• PR30592 objcopy: allow --set-section-flags to add or remove SHF_X86_64_LARGE
• ld: Allow R_386_GOT32 for call *__tls_get_addr@GOT(%reg)
• ld: Allow R_X86_64_GOTPCREL for call *__tls_get_addr@GOTPCREL(%rip)
• RISC-V: Add --[no-]relax-gp to ld

GCC

I had one patch landed supporting -mlarge-data-threshold= for x86-64 -mcmodel=medium.

Linux kernel

8 commits. Consulted on a number of toolchain questions.

Blog

Wrote 29 blog posts (including this one, mainly about toolchains) and revised many posts initially written between 2020 and 2023.

Misc

Trips: Orlando, Philadelphia, Harrisburg, Trenton, Newark, New York City, Alaska, Ontario, Quebec, Nova Scotia, Chicago, Atlanta, Miami, Jamaica, Haiti.

Mastodon: https://hachyderm.io/@meowray