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//===- lib/Driver/Driver.cpp - Linker Driver Emulator ---------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lld/Driver/Driver.h"
#include "lld/Core/LLVM.h"
#include "lld/Core/InputFiles.h"
#include "lld/Core/Instrumentation.h"
#include "lld/Core/PassManager.h"
#include "lld/Core/Parallel.h"
#include "lld/Core/Resolver.h"
#include "lld/ReaderWriter/Reader.h"
#include "lld/ReaderWriter/Writer.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Option/Arg.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
namespace lld {
/// This is where the link is actually performed.
bool Driver::link(const LinkingContext &context, raw_ostream &diagnostics) {
// Honor -mllvm
if (!context.llvmOptions().empty()) {
unsigned numArgs = context.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] = context.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(
context.inputFiles().size());
size_t index = 0;
std::atomic<bool> fail(false);
TaskGroup tg;
for (const auto &input : context.inputFiles()) {
if (context.logInputFiles())
llvm::outs() << input.getPath() << "\n";
tg.spawn([ &, index]{
if (error_code ec = context.readFile(input.getPath(), files[index])) {
diagnostics << "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.
context.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(context, inputs);
if (resolver.resolve()) {
if (!context.allowRemainingUndefines())
return true;
}
MutableFile &merged = resolver.resultFile();
resolveTask.end();
// Run passes on linked atoms.
ScopedTask passTask(getDefaultDomain(), "Passes");
PassManager pm;
context.addPasses(pm);
pm.runOnFile(merged);
passTask.end();
// Give linked atoms to Writer to generate output file.
ScopedTask writeTask(getDefaultDomain(), "Write");
if (error_code ec = context.writeFile(merged)) {
diagnostics << "Failed to write file '" << context.outputPath()
<< "': " << ec.message() << "\n";
return true;
}
return false;
}
} // namespace
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