b13cda8f3e
Previously only GNU driver calls InputGraph::normalize, but its functionality is not and should not be limited to GNU ld. Other driver should be able to use it. Currently only linker scripts use the feature, so this change won't change the existing behavior. llvm-svn: 208266
143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
//===- lib/Driver/Driver.cpp - Linker Driver Emulator ---------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lld/Driver/Driver.h"
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#include "lld/Core/LLVM.h"
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#include "lld/Core/Instrumentation.h"
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#include "lld/Core/PassManager.h"
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#include "lld/Core/Parallel.h"
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#include "lld/Core/Resolver.h"
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#include "lld/ReaderWriter/Reader.h"
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#include "lld/ReaderWriter/Writer.h"
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#include "lld/Passes/RoundTripNativePass.h"
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#include "lld/Passes/RoundTripYAMLPass.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Option/Arg.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/raw_ostream.h"
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#include <mutex>
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namespace lld {
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/// This is where the link is actually performed.
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bool Driver::link(LinkingContext &context, raw_ostream &diagnostics) {
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// Honor -mllvm
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if (!context.llvmOptions().empty()) {
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unsigned numArgs = context.llvmOptions().size();
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const char **args = new const char *[numArgs + 2];
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args[0] = "lld (LLVM option parsing)";
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for (unsigned i = 0; i != numArgs; ++i)
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args[i + 1] = context.llvmOptions()[i];
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args[numArgs + 1] = 0;
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llvm::cl::ParseCommandLineOptions(numArgs + 1, args);
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}
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InputGraph &inputGraph = context.getInputGraph();
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if (!inputGraph.size())
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return false;
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inputGraph.normalize();
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bool fail = false;
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// Read inputs
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ScopedTask readTask(getDefaultDomain(), "Read Args");
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TaskGroup tg;
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std::mutex diagnosticsMutex;
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for (std::unique_ptr<InputElement> &ie : inputGraph.inputElements()) {
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tg.spawn([&] {
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// Writes to the same output stream is not guaranteed to be thread-safe.
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// We buffer the diagnostics output to a separate string-backed output
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// stream, acquire the lock, and then print it out.
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std::string buf;
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llvm::raw_string_ostream stream(buf);
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if (error_code ec = ie->parse(context, stream)) {
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if (FileNode *fileNode = dyn_cast<FileNode>(ie.get()))
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stream << fileNode->errStr(ec) << "\n";
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else if (dyn_cast<Group>(ie.get()))
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// FIXME: We need a better diagnostics here
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stream << "Cannot parse group input element\n";
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else
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llvm_unreachable("Unknown type of input element");
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fail = true;
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}
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stream.flush();
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if (!buf.empty()) {
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std::lock_guard<std::mutex> lock(diagnosticsMutex);
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diagnostics << buf;
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}
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});
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}
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tg.sync();
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readTask.end();
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if (fail)
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return false;
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std::unique_ptr<SimpleFileNode> fileNode(
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new SimpleFileNode("Internal Files"));
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InputGraph::FileVectorT internalFiles;
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context.createInternalFiles(internalFiles);
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if (internalFiles.size())
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fileNode->addFiles(std::move(internalFiles));
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// Give target a chance to add files.
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InputGraph::FileVectorT implicitFiles;
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context.createImplicitFiles(implicitFiles);
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if (implicitFiles.size())
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fileNode->addFiles(std::move(implicitFiles));
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context.getInputGraph().insertElementAt(std::move(fileNode),
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InputGraph::Position::BEGIN);
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// Do core linking.
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ScopedTask resolveTask(getDefaultDomain(), "Resolve");
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Resolver resolver(context);
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if (!resolver.resolve())
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return false;
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std::unique_ptr<MutableFile> merged = resolver.resultFile();
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resolveTask.end();
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// Run passes on linked atoms.
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ScopedTask passTask(getDefaultDomain(), "Passes");
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PassManager pm;
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context.addPasses(pm);
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#ifndef NDEBUG
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llvm::Optional<std::string> env = llvm::sys::Process::GetEnv("LLD_RUN_ROUNDTRIP_TEST");
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if (env.hasValue() && !env.getValue().empty()) {
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pm.add(std::unique_ptr<Pass>(new RoundTripYAMLPass(context)));
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pm.add(std::unique_ptr<Pass>(new RoundTripNativePass(context)));
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}
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#endif
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pm.runOnFile(merged);
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passTask.end();
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// Give linked atoms to Writer to generate output file.
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ScopedTask writeTask(getDefaultDomain(), "Write");
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if (error_code ec = context.writeFile(*merged)) {
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diagnostics << "Failed to write file '" << context.outputPath()
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<< "': " << ec.message() << "\n";
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return false;
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}
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return true;
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}
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} // namespace
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