[PATCH] D68965: [WebAssembly] Elide data segments for .bss sections

[Thomas Lively via Phabricator via llvm-commits]

tlively created this revision.
tlively added a reviewer: sbc100.
Herald added subscribers: llvm-commits, sunfish, aheejin, jgravelle-google, dschuff.
Herald added a project: LLVM.

WebAssembly memories are zero-initialized, so when module does not
import its memory initializing .bss sections is guaranteed to be a
no-op. To reduce binary size and initialization time, .bss sections
are simply not emitted into the final binary unless the memory is
imported.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D68965

Files:
  lld/test/wasm/Inputs/locals-duplicate1.ll
  lld/test/wasm/Inputs/locals-duplicate2.ll
  lld/test/wasm/bss-only.ll
  lld/test/wasm/custom-section-name.ll
  lld/test/wasm/data-layout.ll
  lld/test/wasm/data-segments.ll
  lld/test/wasm/locals-duplicate.test
  lld/wasm/OutputSections.cpp
  lld/wasm/OutputSections.h
  lld/wasm/OutputSegment.h
  lld/wasm/SyntheticSections.cpp
  lld/wasm/SyntheticSections.h
  lld/wasm/Writer.cpp

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