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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/Core/ArchiveLibraryFile.h"
#include "lld/Core/File.h"
#include "lld/Core/Instrumentation.h"
#include "lld/Core/LLVM.h"
#include "lld/Core/Parallel.h"
#include "lld/Core/PassManager.h"
#include "lld/Core/Reader.h"
#include "lld/Core/Resolver.h"
#include "lld/Core/Writer.h"
#include "lld/Driver/Driver.h"
#include "llvm/ADT/STLExtras.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/Process.h"
#include "llvm/Support/raw_ostream.h"
#include <mutex>
namespace lld {
FileVector makeErrorFile(StringRef path, std::error_code ec) {
std::vector<std::unique_ptr<File>> result;
result.push_back(llvm::make_unique<ErrorFile>(path, ec));
return result;
}
FileVector parseMemberFiles(FileVector &files) {
std::vector<std::unique_ptr<File>> members;
for (std::unique_ptr<File> &file : files) {
if (auto *archive = dyn_cast<ArchiveLibraryFile>(file.get())) {
if (std::error_code ec = archive->parseAllMembers(members))
return makeErrorFile(file->path(), ec);
} else {
members.push_back(std::move(file));
}
}
return members;
}
FileVector loadFile(LinkingContext &ctx, StringRef path, bool wholeArchive) {
ErrorOr<std::unique_ptr<MemoryBuffer>> mb
= MemoryBuffer::getFileOrSTDIN(path);
if (std::error_code ec = mb.getError())
return makeErrorFile(path, ec);
std::vector<std::unique_ptr<File>> files;
if (std::error_code ec = ctx.registry().loadFile(std::move(mb.get()), files))
return makeErrorFile(path, ec);
if (wholeArchive)
return parseMemberFiles(files);
return files;
}
/// This is where the link is actually performed.
bool Driver::link(LinkingContext &ctx, raw_ostream &diagnostics) {
// Honor -mllvm
if (!ctx.llvmOptions().empty()) {
unsigned numArgs = ctx.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] = ctx.llvmOptions()[i];
args[numArgs + 1] = 0;
llvm::cl::ParseCommandLineOptions(numArgs + 1, args);
}
if (ctx.getNodes().empty())
return false;
for (std::unique_ptr<Node> &ie : ctx.getNodes())
if (FileNode *node = dyn_cast<FileNode>(ie.get()))
ctx.getTaskGroup().spawn([node] { node->getFile()->parse(); });
std::vector<std::unique_ptr<File>> internalFiles;
ctx.createInternalFiles(internalFiles);
for (auto i = internalFiles.rbegin(), e = internalFiles.rend(); i != e; ++i) {
auto &members = ctx.getNodes();
members.insert(members.begin(), llvm::make_unique<FileNode>(std::move(*i)));
}
// Give target a chance to add files.
std::vector<std::unique_ptr<File>> implicitFiles;
ctx.createImplicitFiles(implicitFiles);
for (auto i = implicitFiles.rbegin(), e = implicitFiles.rend(); i != e; ++i) {
auto &members = ctx.getNodes();
members.insert(members.begin(), llvm::make_unique<FileNode>(std::move(*i)));
}
// Give target a chance to postprocess input files.
// Mach-O uses this chance to move all object files before library files.
// ELF adds specific undefined symbols resolver.
ctx.finalizeInputFiles();
// Do core linking.
ScopedTask resolveTask(getDefaultDomain(), "Resolve");
Resolver resolver(ctx);
if (!resolver.resolve()) {
ctx.getTaskGroup().sync();
return false;
}
std::unique_ptr<SimpleFile> merged = resolver.resultFile();
resolveTask.end();
// Run passes on linked atoms.
ScopedTask passTask(getDefaultDomain(), "Passes");
PassManager pm;
ctx.addPasses(pm);
pm.runOnFile(merged);
passTask.end();
// Give linked atoms to Writer to generate output file.
ScopedTask writeTask(getDefaultDomain(), "Write");
if (std::error_code ec = ctx.writeFile(*merged)) {
diagnostics << "Failed to write file '" << ctx.outputPath()
<< "': " << ec.message() << "\n";
return false;
}
return true;
}
} // namespace
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