[PATCH] D70700: [WebAssembly] Mangle the argc/argv `main` as `__wasm_argc_argv`

[Dan Gohman via Phabricator via cfe-commits]

sunfish created this revision.
Herald added subscribers: llvm-commits, dexonsmith, aheejin, jgravelle-google, sbc100, mehdi_amini, dschuff.
Herald added projects: clang, LLVM.

WebAssembly enforces a rule that caller and callee signatures must
match. This means that the traditional technique of passing `main`
`argc` and `argv` even when it doesn't need them doesn't work.

Currently the backend renames `main` to `__original_main`, however this
doesn't interact well with LTO'ing libc, and the name isn't intuitive.
This patch allows us to transition to `__main_argc_argv` instead.

This is currently being discussed in https://github.com/WebAssembly/tool-conventions/pull/134.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D70700

Files:
  clang/lib/AST/Mangle.cpp
  clang/lib/Frontend/InitHeaderSearch.cpp
  clang/test/CodeGen/wasm-call-main.c
  clang/test/CodeGen/wasm-main.c
  clang/test/CodeGen/wasm-main_argc_argv.c
  llvm/include/llvm/ADT/Triple.h

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