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This commit is contained in:
Rui Ueyama 2021-01-25 13:16:26 +09:00
parent 68e6bb7583
commit 1890feec8d
3 changed files with 11 additions and 25 deletions
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29
gc_sections.cc
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@ -24,6 +24,10 @@ visit(InputSection *isec, std::function<void(InputSection *)> enqueue) {
for (SectionFragmentRef &ref : isec->rel_fragments)
ref.frag->is_alive = true;
for (FdeRecord &fde : isec->fdes)
for (i64 i = 1; i < fde.rels.size(); i++)
enqueue(fde.rels[i].sym.input_section);
for (ElfRela &rel : isec->rels)
enqueue(isec->file->symbols[rel.r_sym]->input_section);
}
@ -80,28 +84,6 @@ void gc_sections() {
});
});
// Mark everything that are referenced by live FDEs.
tbb::parallel_for_each(out::objs, [&](ObjectFile *file) {
for (CieRecord &cie : file->cies) {
for (FdeRecord &fde : cie.fdes) {
if (!fde.is_alive)
continue;
// We skip the first relocation because it's always alive if
// is_alive returned true.
for (i64 i = 1; i < fde.rels.size(); i++) {
InputSection *isec = fde.rels[i].sym.input_section;
if (!isec)
continue;
if (!isec->rels.empty())
Fatal() << *isec << ": a section referenced by .eh_frame"
<< " with relocations is not supported";
enqueue(isec);
}
}
}
});
// Remove unreachable sections
tbb::parallel_for_each(out::objs, [&](ObjectFile *file) {
for (i64 i = 0; i < file->sections.size(); i++) {
@ -110,8 +92,7 @@ void gc_sections() {
if (isec && isec->is_alive && !isec->is_ehframe && !isec->is_visited) {
if (config.print_gc_sections)
SyncOut() << "removing unused section " << *isec;
isec->is_alive = false;
file->sections[i] = nullptr;
isec->kill();
}
}
});

4
mold.h
View File

@ -345,12 +345,14 @@ struct FdeRecord {
FdeRecord(const FdeRecord &&other)
: contents(other.contents), rels(std::move(other.rels)),
offset(other.offset), is_alive(other.is_alive.load()) {}
offset(other.offset), is_alive(other.is_alive.load()),
is_visited(other.is_visited.load()) {}
std::string_view contents;
std::vector<EhReloc> rels;
u32 offset = -1;
std::atomic_bool is_alive = true;
std::atomic_bool is_visited = false;
};
struct CieRecord {

3
test/exception.sh
View File

@ -21,4 +21,7 @@ $t/exe
clang++ -fuse-ld=`pwd`/../mold -o $t/exe $t/a.cc
$t/exe
clang++ -fuse-ld=`pwd`/../mold -o $t/exe $t/a.cc -Wl,--gc-sections
$t/exe
echo OK