[PATCH] D51456: [LLD] [COFF] When doing automatic dll imports, replace whole .refptr.<var> chunks with __imp_<var>

[Martin Storsjö via Phabricator via llvm-commits]

mstorsjo created this revision.
mstorsjo added reviewers: ruiu, rnk, pcc.

After fixing up the runtime pseudo relocation, the .refptr.<var> will be a plain pointer with the same value as the IAT entry itself. To save a little binary size and reduce the number of runtime pseudo relocations, redirect references to the IAT entry (via the __imp_<var> symbol) itself and discard the .refptr.<var> chunk (as long as the same section chunk doesn't contain anything else than the single pointer).


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D51456

Files:
  COFF/Chunks.h
  COFF/SymbolTable.cpp
  test/COFF/autoimport-refptr.s

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