std::unique_ptr<File>
LinkingContext::createEntrySymbolFile(StringRef filename) const {
if (entrySymbolName().empty())
return nullptr;
std::unique_ptr<SimpleFile> entryFile(new SimpleFile(filename));
entryFile->addAtom(
*(new (_allocator) SimpleUndefinedAtom(*entryFile, entrySymbolName())));
return std::move(entryFile);
}
bool MachOLinkingContext::validateImpl(raw_ostream &diagnostics) {
// TODO: if -arch not specified, look at arch of first .o file.
if (_currentVersion && _outputMachOType != MH_DYLIB) {
diagnostics << "error: -current_version can only be used with dylibs\n";
return false;
}
if (_compatibilityVersion && _outputMachOType != MH_DYLIB) {
diagnostics
<< "error: -compatibility_version can only be used with dylibs\n";
return false;
}
if (_deadStrippableDylib && _outputMachOType != MH_DYLIB) {
diagnostics
<< "error: -mark_dead_strippable_dylib can only be used with dylibs.\n";
return false;
}
if (!_bundleLoader.empty() && outputMachOType() != MH_BUNDLE) {
diagnostics
<< "error: -bundle_loader can only be used with Mach-O bundles\n";
return false;
}
// If -exported_symbols_list used, all exported symbols must be defined.
if (_exportMode == ExportMode::whiteList) {
for (const auto &symbol : _exportedSymbols)
addInitialUndefinedSymbol(symbol.getKey());
}
// If -dead_strip, set up initial live symbols.
if (deadStrip()) {
// Entry point is live.
if (outputTypeHasEntry())
addDeadStripRoot(entrySymbolName());
// Lazy binding helper is live.
if (needsStubsPass())
addDeadStripRoot(binderSymbolName());
// If using -exported_symbols_list, make all exported symbols live.
if (_exportMode == ExportMode::whiteList) {
setGlobalsAreDeadStripRoots(false);
for (const auto &symbol : _exportedSymbols)
addDeadStripRoot(symbol.getKey());
}
}
addOutputFileDependency(outputPath());
return true;
}
bool ELFLinkingContext::validateImpl(raw_ostream &diagnostics) {
switch (outputFileType()) {
case LinkingContext::OutputFileType::YAML:
_writer = createWriterYAML(*this);
break;
default:
_writer = createWriterELF(*this);
break;
}
// If -dead_strip, set up initial live symbols.
if (deadStrip())
addDeadStripRoot(entrySymbolName());
return true;
}