forked from OSchip/llvm-project
137 lines
4.2 KiB
C++
137 lines
4.2 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/Instrumentation.h"
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#include "lld/Core/LLVM.h"
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#include "lld/Core/Parallel.h"
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#include "lld/Core/PassManager.h"
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#include "lld/Core/Resolver.h"
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#include "lld/Passes/RoundTripNativePass.h"
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#include "lld/Passes/RoundTripYAMLPass.h"
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#include "lld/ReaderWriter/Reader.h"
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#include "lld/ReaderWriter/Writer.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/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 (std::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
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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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InputGraph::FileVectorT internalFiles;
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context.createInternalFiles(internalFiles);
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for (auto i = internalFiles.rbegin(), e = internalFiles.rend(); i != e; ++i) {
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context.getInputGraph().addInputElementFront(
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llvm::make_unique<SimpleFileNode>("internal", std::move(*i)));
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}
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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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for (auto i = implicitFiles.rbegin(), e = implicitFiles.rend(); i != e; ++i) {
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context.getInputGraph().addInputElementFront(
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llvm::make_unique<SimpleFileNode>("implicit", std::move(*i)));
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}
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// Give target a chance to sort the input files.
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// Mach-O uses this chance to move all object files before library files.
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context.maybeSortInputFiles();
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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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if (context.runRoundTripPass()) {
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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 (std::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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