[mach-o] set ordinal in n_desc for undefined symbols
Mach-o uses "two-level namespace" where each undefined symbols is associated
with a specific dylib. This means at runtime the loader (dyld) does need to
search all loaded dylibs for that symbol but rather just the one specified.
Now that llvm-nm -m prints out that info, properly set that info, and test
it in the hello world test cases.
llvm-svn: 215598
diff --git a/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp b/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp
index 9f8fa42..efb9d9c 100644
--- a/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp
+++ b/lld/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp
@@ -761,11 +761,16 @@
const uint32_t start = file.globalSymbols.size() + file.localSymbols.size();
for (AtomAndIndex &ai : undefs) {
Symbol sym;
+ uint16_t desc = 0;
+ if (!rMode) {
+ uint8_t ordinal = dylibOrdinal(dyn_cast<SharedLibraryAtom>(ai.atom));
+ llvm::MachO::SET_LIBRARY_ORDINAL(desc, ordinal);
+ }
sym.name = ai.atom->name();
sym.type = N_UNDF;
sym.scope = N_EXT;
sym.sect = 0;
- sym.desc = 0;
+ sym.desc = desc;
sym.value = 0;
_atomToSymbolIndex[ai.atom] = file.undefinedSymbols.size() + start;
file.undefinedSymbols.push_back(sym);