tree 9205c0a1ba4d7cfdb3b8816001f22f9cd06ef73a
parent 183315165e6b757c62ee03cf8b29ea8fb924f234
author Nico Weber <thakis@chromium.org> 1614300991 -0500
committer Copybara-Service <copybara-worker@google.com> 1614405854 -0800

[lld/mac] Add some support for dynamic lookup symbols, and implement -U

Dynamic lookup symbols are symbols that work like dynamic symbols
in ELF: They're not bound to a dylib like normal Mach-O twolevel lookup
symbols, but they live in a global pool and dyld resolves them against
exported symbols from all loaded dylibs.

This adds support for dynamical lookup symbols to lld/mac. They are
represented as DylibSymbols with file set to nullptr.

This also uses this support to implement the -U flag, which makes
a specific symbol that's undefined at the end of the link a
dynamic lookup symbol.

For -U, it'd be sufficient to just to a pass over remaining undefined symbols
at the end of the link and to replace them with dynamic lookup symbols then.
But I'd like to use this code to implement flat_namespace too, and that will
require real support for resolving dynamic lookup symbols in SymbolTable. So
this patch adds this now already.

While writing tests for this, I noticed that we didn't set N_WEAK_DEF in the
symbol table for DylibSymbols, so this fixes that too.

Differential Revision: https://reviews.llvm.org/D97521

GitOrigin-RevId: cafb6cd10c7434fdb541a40eda89fc51880f43c0