[PATCH] D96659: [WebAssembly] Add new relocation for pc-rel data

[Yuta Saito via Phabricator via llvm-commits]

kateinoigakukun created this revision.
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This `R_WASM_MEMORY_ADDR_SELFREL_I32` relocation represents an offset
between its relocating address and the symbol address. It's very similar
to `R_X86_64_PC32` but restricted to be used for only data segments.

  S + A - P

A: Represents the addend used to compute the value of the relocatable
field.
P: Represents the place of the storage unit being relocated.
S: Represents the value of the symbol whose index resides in the
relocation entry.

Proposal: https://github.com/WebAssembly/tool-conventions/issues/162


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96659

Files:
  lld/test/wasm/selfrel-reloc.ll
  lld/wasm/InputChunks.cpp
  lld/wasm/InputFiles.cpp
  lld/wasm/InputFiles.h
  llvm/include/llvm/BinaryFormat/WasmRelocs.def
  llvm/include/llvm/MC/MCWasmObjectWriter.h
  llvm/lib/BinaryFormat/Wasm.cpp
  llvm/lib/MC/WasmObjectWriter.cpp
  llvm/lib/Object/RelocationResolver.cpp
  llvm/lib/Object/WasmObjectFile.cpp
  llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
  llvm/test/MC/WebAssembly/bad-fixup-expr.s
  llvm/test/MC/WebAssembly/selfrel.ll

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