[PATCH] D150803: [WebAssembly] Add a new `wasm_async` clang attribute for marking async functions.

[Brendan Dahl via Phabricator via cfe-commits]

brendandahl created this revision.
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The attribute may be attached to a function definition, which indicates
the function will be used with JavaScript promise integration (JSPI). The
attribute will cause the creation of a custom section named "async" that
contains each wasm_async function's index value.

A new patchable relocation type for function indexes had to be created so
the custom section could be updated during linking.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150803

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/lib/CodeGen/TargetInfo.cpp
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/test/CodeGen/WebAssembly/wasm-async.c
  clang/test/Misc/pragma-attribute-supported-attributes-list.test
  lld/test/wasm/async.ll
  lld/test/wasm/merge-async-section.ll
  lld/wasm/InputChunks.cpp
  lld/wasm/InputFiles.cpp
  llvm/include/llvm/BinaryFormat/WasmRelocs.def
  llvm/include/llvm/MC/MCExpr.h
  llvm/lib/MC/MCExpr.cpp
  llvm/lib/MC/WasmObjectWriter.cpp
  llvm/lib/Object/WasmObjectFile.cpp
  llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.h
  llvm/test/CodeGen/WebAssembly/async.ll
  llvm/test/MC/WebAssembly/async.s

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