[all-commits] [llvm/llvm-project] 8959ec: [WebAssembly] Add target architecture to object fi...

[Sam Clegg via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8959ec064109a202c05cf0e1751cc953a7634f63
      https://github.com/llvm/llvm-project/commit/8959ec064109a202c05cf0e1751cc953a7634f63
  Author: Sam Clegg <sbc at chromium.org>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M lld/test/wasm/check-arch-32-in-64.test
    M lld/test/wasm/check-arch-64-in-32.test
    M lld/test/wasm/dylink.s
    M lld/test/wasm/emit-relocs.s
    M lld/test/wasm/locals-duplicate.test
    M lld/test/wasm/lto/relocatable-undefined.ll
    M lld/test/wasm/pie.s
    M lld/test/wasm/relocatable.ll
    M lld/test/wasm/rpath.s
    M lld/test/wasm/shared-needed.s
    M lld/test/wasm/shared-weak-undefined.s
    M lld/test/wasm/shared.s
    M lld/test/wasm/shared64.s
    M lld/test/wasm/signature-mismatch-relocatable.s
    M lld/test/wasm/signature-mismatch.s
    M lld/test/wasm/stack-pointer.s
    M lld/test/wasm/tls-export.s
    M lld/test/wasm/weak-alias.s
    M lld/wasm/InputFiles.cpp
    M lld/wasm/SyntheticSections.cpp
    M llvm/include/llvm/BinaryFormat/Wasm.h
    M llvm/include/llvm/ObjectYAML/WasmYAML.h
    M llvm/lib/MC/WasmObjectWriter.cpp
    M llvm/lib/Object/WasmObjectFile.cpp
    M llvm/lib/ObjectYAML/WasmEmitter.cpp
    M llvm/lib/ObjectYAML/WasmYAML.cpp
    M llvm/test/CodeGen/WebAssembly/profile.ll
    M llvm/test/MC/WebAssembly/assembler-binary.ll
    M llvm/test/MC/WebAssembly/call-indirect-relocs.s
    M llvm/test/MC/WebAssembly/comdat.ll
    M llvm/test/MC/WebAssembly/common.s
    M llvm/test/MC/WebAssembly/custom-sections.ll
    M llvm/test/MC/WebAssembly/data-section.s
    M llvm/test/MC/WebAssembly/debug-info.ll
    M llvm/test/MC/WebAssembly/debug-info64.ll
    M llvm/test/MC/WebAssembly/export-name.s
    M llvm/test/MC/WebAssembly/function-sections.ll
    M llvm/test/MC/WebAssembly/global-ctor-dtor.ll
    M llvm/test/MC/WebAssembly/globals.s
    M llvm/test/MC/WebAssembly/init-array-label.s
    M llvm/test/MC/WebAssembly/init-array.s
    M llvm/test/MC/WebAssembly/reloc-pic.s
    M llvm/test/MC/WebAssembly/reloc-pic64.s
    M llvm/test/MC/WebAssembly/tables.s
    M llvm/test/MC/WebAssembly/tag-section.s
    M llvm/test/MC/WebAssembly/tls.s
    M llvm/test/MC/WebAssembly/tls64.s
    M llvm/test/MC/WebAssembly/type-index.s
    M llvm/test/MC/WebAssembly/unnamed-data.ll
    M llvm/test/MC/WebAssembly/wasm64.s
    M llvm/test/MC/WebAssembly/weak-alias.s
    M llvm/test/ObjectYAML/wasm/dylink_section.yaml
    M llvm/test/ObjectYAML/wasm/linking_section.yaml
    M llvm/tools/obj2yaml/wasm2yaml.cpp

  Log Message:
  -----------
  [WebAssembly] Add target architecture to object file format (#225979)

Store the target architecture string (`wasm32` or `wasm64`) in a new
`WASM_TARGET_ARCH` subsection in the `linking` custom section and in a
new `WASM_DYLINK_TARGET_ARCH` subsection in the `dylink.0` custom
section.

Previously, architecture detection for object files and shared libraries
relied on heuristics (such as whether memory64 was imported/defined or
presence of 64-bit relocations). For modules that do not access memory,
this resulted in wasm64 objects/shared libraries being incorrectly
detected as wasm32.

With this change:
- `WasmObjectWriter` emits the `WASM_TARGET_ARCH` subsection in
  `linking`.
- `wasm-ld` emits `WASM_DYLINK_TARGET_ARCH` when generating shared
  libraries and `WASM_TARGET_ARCH` when generating relocatable output
  (`-r`).
- `WasmObjectFile::getArch()` checks these subsections first before
  falling back to the `HasMemory64` heuristic.
- `SharedFile` in `lld` now checks the object architecture via
  `checkArch()`.
- Added support to `obj2yaml` and `yaml2obj`.

Fixes: #98778



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications