[PATCH] D63833: [wasm-ld] Add __global_base symbol to mark the value of --global-base

[Guanzhong Chen via Phabricator via llvm-commits]

quantum created this revision.
quantum added reviewers: tlively, aheejin, sbc100.
Herald added subscribers: llvm-commits, sunfish.
Herald added a project: LLVM.

This is needed for address sanitizer on Emscripten. As everything in
memory starts at the value passed to --global-base, everything before
that can be used as shadow memory.

This symbol is added so that the library for the ASan runtime can know
where the shadow memory ends and real memory begins.

This is split from D63742 <https://reviews.llvm.org/D63742>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D63833

Files:
  lld/test/wasm/global-base.ll
  lld/wasm/Driver.cpp
  lld/wasm/Symbols.cpp
  lld/wasm/Symbols.h
  lld/wasm/Writer.cpp

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