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This commit is contained in:
Rui Ueyama 2020-11-20 07:33:20 +09:00
parent f4fef9cf56
commit 468daa3a0e
1 changed files with 17 additions and 2 deletions
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19
object_file.cc
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@ -309,6 +309,15 @@ void ObjectFile::parse() {
}
}
// Symbols with higher priorities overwrites symbols with lower priorities.
// Here is the list of priorities, from the highest to the lowest.
//
// 1. Strong defined symbol
// 2. Weak defined symbol
// 3. Defined symbol in an archive member
// 4. Unclaimed (nonexistent) symbol
//
// Ties are broken by file priority.
static u64 get_rank(ObjectFile *file, const ELF64LE::Sym &esym) {
if (esym.isUndefined()) {
assert(esym.getBinding() == STB_WEAK);
@ -351,8 +360,9 @@ void ObjectFile::maybe_override_symbol(const ELF64LE::Sym &esym, Symbol &sym, in
sym.is_dso = is_dso;
if (UNLIKELY(sym.traced))
llvm::outs() << "trace: " << toString(sym.file) << ": definition of "
<< sym.name << "\n";
message("trace: " + toString(sym.file) +
(sym.is_weak ? ": weak definition of " : ": definition of ") +
sym.name);
}
}
@ -373,6 +383,9 @@ void ObjectFile::resolve_symbols() {
if (is_new || tie_but_higher_priority) {
sym.file = this;
sym.is_placeholder = true;
if (UNLIKELY(sym.traced))
message("trace: " + toString(sym.file) + ": lazy definition of " + sym.name);
}
} else {
maybe_override_symbol(esym, sym, i);
@ -382,6 +395,8 @@ void ObjectFile::resolve_symbols() {
void
ObjectFile::mark_live_archive_members(tbb::parallel_do_feeder<ObjectFile *> &feeder) {
assert(is_alive);
for (int i = first_global; i < symbols.size(); i++) {
const ELF64LE::Sym &esym = elf_syms[i];
Symbol &sym = *symbols[i];