[all-commits] [llvm/llvm-project] 4ea72c: [ELF] Add target-specific relocation scanning for ...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4ea72c1e8cbdc5918673148aef12052ae4b86ae4
      https://github.com/llvm/llvm-project/commit/4ea72c1e8cbdc5918673148aef12052ae4b86ae4
  Author: Fangrui Song <i at maskray.me>
  Date:   2026-03-06 (Fri, 06 Mar 2026)

  Changed paths:
    M lld/ELF/Arch/RISCV.cpp
    M lld/ELF/InputSection.cpp
    M lld/ELF/Relocations.cpp
    M lld/test/ELF/riscv-reloc-leb128.s
    M lld/test/ELF/riscv-vendor-relocations.s
    A lld/test/ELF/riscv-vendor-relocations2.test

  Log Message:
  -----------
  [ELF] Add target-specific relocation scanning for RISC-V (#181332)

Implement RISCV::scanSectionImpl, following the pattern established
for x86 (#178846) and AArch64 (#181099). This merges the getRelExpr
and TLS handling for SHF_ALLOC sections into the target-specific
scanner, enabling devirtualization and eliminating abstraction
overhead.

- Inline relocation classification into scanSectionImpl with a switch
  on relocation type, replacing the generic rs.scan() path.
- Use processR_PC/processR_PLT_PC for common PC-relative and PLT
  relocations.
- Handle TLS IE and GD directly (RISC-V does not optimize GD/LD/IE).
- Replace TLS-optimization-specific expressions for TLSDESC, following
  the x86 pattern: R_RELAX_TLS_GD_TO_IE -> R_GOT_PC,
  R_RELAX_TLS_GD_TO_LE -> R_TPREL. Update relocateAlloc and relax()
  to dispatch on relocation type instead of RelExpr for TLSDESC.
- Simplify getRelExpr to only handle relocations needed by
  relocateNonAlloc and preprocessRelocs.
- Remove RISC-V-specific checks from handleTlsRelocation (isRISCV
  variable, TLSDESC label special cases).
- Move R_RISCV_VENDOR handling into the relocation type switch. An
  undefined vendor symbol now gets the standard undefined symbol error
  instead of a vendor-specific diagnostic.



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