/// This is where the link is actually performed.
bool Driver::link(const TargetInfo &targetInfo) {
// Honor -mllvm
if (!targetInfo.llvmOptions().empty()) {
unsigned numArgs = targetInfo.llvmOptions().size();
const char **args = new const char*[numArgs + 2];
args[0] = "lld (LLVM option parsing)";
for (unsigned i = 0; i != numArgs; ++i)
args[i + 1] = targetInfo.llvmOptions()[i];
args[numArgs + 1] = 0;
llvm::cl::ParseCommandLineOptions(numArgs + 1, args);
}
// Read inputs
ScopedTask readTask(getDefaultDomain(), "Read Args");
std::vector<std::vector<std::unique_ptr<File>>> files(
targetInfo.inputFiles().size());
size_t index = 0;
std::atomic<bool> fail(false);
TaskGroup tg;
for (const auto &input : targetInfo.inputFiles()) {
if (targetInfo.logInputFiles())
llvm::outs() << input.getPath() << "\n";
tg.spawn([ &, index]{
if (error_code ec = targetInfo.readFile(input.getPath(), files[index])) {
llvm::errs() << "Failed to read file: " << input.getPath() << ": "
<< ec.message() << "\n";
fail = true;
return;
}
});
++index;
}
tg.sync();
readTask.end();
if (fail)
return true;
InputFiles inputs;
for (auto &f : files)
inputs.appendFiles(f);
// Give target a chance to add files.
targetInfo.addImplicitFiles(inputs);
// assign an ordinal to each file so sort() can preserve command line order
inputs.assignFileOrdinals();
// Do core linking.
ScopedTask resolveTask(getDefaultDomain(), "Resolve");
Resolver resolver(targetInfo, inputs);
if (resolver.resolve()) {
if (!targetInfo.allowRemainingUndefines())
return true;
}
MutableFile &merged = resolver.resultFile();
resolveTask.end();
// Run passes on linked atoms.
ScopedTask passTask(getDefaultDomain(), "Passes");
PassManager pm;
targetInfo.addPasses(pm);
pm.runOnFile(merged);
passTask.end();
// Give linked atoms to Writer to generate output file.
ScopedTask writeTask(getDefaultDomain(), "Write");
if (error_code ec = targetInfo.writeFile(merged)) {
llvm::errs() << "Failed to write file '" << targetInfo.outputPath()
<< "': " << ec.message() << "\n";
return true;
}
return false;
}
