tree 2c024928ab9f8a43dd470e3826efc636f12a1899
parent 5c63f0cbd82b92e57ec1c8aa929dee820d1b3938
author Thomas Lively <tlively@google.com> 1571166311 +0000
committer Thomas Lively <tlively@google.com> 1571166311 +0000

[WebAssembly] Elide data segments for .bss sections

Summary:
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.

Reviewers: sbc100

Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68965

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@374940 91177308-0d34-0410-b5e6-96231b3b80d8