void doPass(const Options& opts, ld::Internal& state)
{
// const bool log = false;
// only optimize dylibs in final linked images
if ( opts.outputKind() == Options::kObjectFile )
return;
// clear "willRemoved" bit on all dylibs
for (std::vector<ld::dylib::File*>::iterator it = state.dylibs.begin(); it != state.dylibs.end(); ++it) {
ld::dylib::File* aDylib = *it;
aDylib->setWillBeRemoved(false);
}
for (std::vector<ld::dylib::File*>::iterator it = state.dylibs.begin(); it != state.dylibs.end(); ++it) {
ld::dylib::File* aDylib = *it;
// set "willRemoved" bit on implicit dylibs that did not provide any exports
if ( aDylib->implicitlyLinked() && !aDylib->explicitlyLinked() && !aDylib->providedExportAtom() )
aDylib->setWillBeRemoved(true);
// set "willRemoved" bit on dead strippable explicit dylibs that did not provide any exports
if ( aDylib->explicitlyLinked() && aDylib->deadStrippable() && !aDylib->providedExportAtom() )
aDylib->setWillBeRemoved(true);
// set "willRemoved" bit on any unused explicit when -dead_strip_dylibs is used
if ( opts.deadStripDylibs() && !aDylib->providedExportAtom() )
aDylib->setWillBeRemoved(true);
}
// remove unused dylibs
state.dylibs.erase(std::remove_if(state.dylibs.begin(), state.dylibs.end(), WillBeUsed()), state.dylibs.end());
}
void doPass(const Options& opts, ld::Internal& state)
{
// const bool log = false;
// clear "willRemoved" bit on all dylibs
for (std::vector<ld::dylib::File*>::iterator it = state.dylibs.begin(); it != state.dylibs.end(); ++it) {
ld::dylib::File* aDylib = *it;
aDylib->setWillBeRemoved(false);
}
for (std::vector<ld::dylib::File*>::iterator it = state.dylibs.begin(); it != state.dylibs.end(); ++it) {
ld::dylib::File* aDylib = *it;
// set "willRemoved" bit on implicit dylibs that did not provide any exports
if ( aDylib->implicitlyLinked() && !aDylib->explicitlyLinked() && !aDylib->providedExportAtom() )
aDylib->setWillBeRemoved(true);
// set "willRemoved" bit on dead strippable explicit dylibs that did not provide any exports
if ( aDylib->explicitlyLinked() && aDylib->deadStrippable() && !aDylib->providedExportAtom() )
aDylib->setWillBeRemoved(true);
// set "willRemoved" bit on any unused explicit when -dead_strip_dylibs is used
if ( opts.deadStripDylibs() && !aDylib->providedExportAtom() )
aDylib->setWillBeRemoved(true);
}
// remove unused dylibs
state.dylibs.erase(std::remove_if(state.dylibs.begin(), state.dylibs.end(), WillBeUsed()), state.dylibs.end());
// <rdar://problem/9441273> automatically weak-import dylibs when all symbols from it are weak-imported
for (std::vector<ld::Internal::FinalSection*>::iterator sit=state.sections.begin(); sit != state.sections.end(); ++sit) {
ld::Internal::FinalSection* sect = *sit;
for (std::vector<const ld::Atom*>::iterator ait=sect->atoms.begin(); ait != sect->atoms.end(); ++ait) {
const ld::Atom* atom = *ait;
const ld::Atom* target = NULL;
bool targetIsWeakImport = false;
for (ld::Fixup::iterator fit = atom->fixupsBegin(), end=atom->fixupsEnd(); fit != end; ++fit) {
if ( fit->firstInCluster() )
target = NULL;
switch ( fit->binding ) {
case ld::Fixup::bindingsIndirectlyBound:
target = state.indirectBindingTable[fit->u.bindingIndex];
targetIsWeakImport = fit->weakImport;
break;
case ld::Fixup::bindingDirectlyBound:
target = fit->u.target;
targetIsWeakImport = fit->weakImport;
break;
default:
break;
}
if ( (target != NULL) && (target->definition() == ld::Atom::definitionProxy) ) {
ld::Atom::WeakImportState curWI = target->weakImportState();
if ( curWI == ld::Atom::weakImportUnset ) {
// first use of this proxy, set weak-import based on this usage
(const_cast<ld::Atom*>(target))->setWeakImportState(targetIsWeakImport);
}
else {
// proxy already has weak-importness set, check for weakness mismatch
bool curIsWeakImport = (curWI == ld::Atom::weakImportTrue);
if ( curIsWeakImport != targetIsWeakImport ) {
// found mismatch
switch ( opts.weakReferenceMismatchTreatment() ) {
case Options::kWeakReferenceMismatchError:
throwf("mismatching weak references for symbol: %s", target->name());
case Options::kWeakReferenceMismatchWeak:
(const_cast<ld::Atom*>(target))->setWeakImportState(true);
break;
case Options::kWeakReferenceMismatchNonWeak:
(const_cast<ld::Atom*>(target))->setWeakImportState(false);
break;
}
}
}
}
}
}
}
}