1 files changed, 276 insertions, 0 deletions
diff --git a/gnu/llvm/tools/lld/ELF/DriverUtils.cpp b/gnu/llvm/tools/lld/ELF/DriverUtils.cpp
new file mode 100644
index 00000000000..3f18259b4ae
--- /dev/null
+++ b/gnu/llvm/tools/lld/ELF/DriverUtils.cpp
@@ -0,0 +1,276 @@
+//===- DriverUtils.cpp ----------------------------------------------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains utility functions for the driver. Because there
+// are so many small functions, we created this separate file to make
+// Driver.cpp less cluttered.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Driver.h"
+#include "Error.h"
+#include "lld/Config/Version.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Option/Option.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/StringSaver.h"
+
+using namespace llvm;
+using namespace llvm::sys;
+
+using namespace lld;
+using namespace lld::elf;
+
+// Create OptTable
+
+// Create prefix string literals used in Options.td
+#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
+#include "Options.inc"
+#undef PREFIX
+
+// Create table mapping all options defined in Options.td
+static const opt::OptTable::Info OptInfo[] = {
+#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10)            \
+  {                                                                            \
+    X1, X2, X9, X10, OPT_##ID, opt::Option::KIND##Class, X8, X7, OPT_##GROUP,  \
+        OPT_##ALIAS, X6                                                        \
+  },
+#include "Options.inc"
+#undef OPTION
+};
+
+ELFOptTable::ELFOptTable() : OptTable(OptInfo) {}
+
+static cl::TokenizerCallback getQuotingStyle(opt::InputArgList &Args) {
+  if (auto *Arg = Args.getLastArg(OPT_rsp_quoting)) {
+    StringRef S = Arg->getValue();
+    if (S != "windows" && S != "posix")
+      error("invalid response file quoting: " + S);
+    if (S == "windows")
+      return cl::TokenizeWindowsCommandLine;
+    return cl::TokenizeGNUCommandLine;
+  }
+  if (Triple(sys::getProcessTriple()).getOS() == Triple::Win32)
+    return cl::TokenizeWindowsCommandLine;
+  return cl::TokenizeGNUCommandLine;
+}
+
+// Parses a given list of options.
+opt::InputArgList ELFOptTable::parse(ArrayRef<const char *> Argv) {
+  // Make InputArgList from string vectors.
+  unsigned MissingIndex;
+  unsigned MissingCount;
+  SmallVector<const char *, 256> Vec(Argv.data(), Argv.data() + Argv.size());
+
+  // We need to get the quoting style for response files before parsing all
+  // options so we parse here before and ignore all the options but
+  // --rsp-quoting.
+  opt::InputArgList Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
+
+  // Expand response files. '@<filename>' is replaced by the file's contents.
+  StringSaver Saver(Alloc);
+  cl::ExpandResponseFiles(Saver, getQuotingStyle(Args), Vec);
+
+  // Parse options and then do error checking.
+  Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
+  if (MissingCount)
+    error(Twine("missing arg value for \"") + Args.getArgString(MissingIndex) +
+          "\", expected " + Twine(MissingCount) +
+          (MissingCount == 1 ? " argument.\n" : " arguments"));
+
+  for (auto *Arg : Args.filtered(OPT_UNKNOWN))
+    error("unknown argument: " + Arg->getSpelling());
+  return Args;
+}
+
+void elf::printHelp(const char *Argv0) {
+  ELFOptTable Table;
+  Table.PrintHelp(outs(), Argv0, "lld", false);
+}
+
+std::string elf::getVersionString() {
+  std::string Version = getLLDVersion();
+  std::string Repo = getLLDRepositoryVersion();
+  if (Repo.empty())
+    return "LLD " + Version + "\n";
+  return "LLD " + Version + " " + Repo + "\n";
+}
+
+// Makes a given pathname an absolute path first, and then remove
+// beginning /. For example, "../foo.o" is converted to "home/john/foo.o",
+// assuming that the current directory is "/home/john/bar".
+std::string elf::relativeToRoot(StringRef Path) {
+  SmallString<128> Abs = Path;
+  if (std::error_code EC = fs::make_absolute(Abs))
+    fatal("make_absolute failed: " + EC.message());
+  path::remove_dots(Abs, /*remove_dot_dot=*/true);
+
+  // This is Windows specific. root_name() returns a drive letter
+  // (e.g. "c:") or a UNC name (//net). We want to keep it as part
+  // of the result.
+  SmallString<128> Res;
+  StringRef Root = path::root_name(Abs);
+  if (Root.endswith(":"))
+    Res = Root.drop_back();
+  else if (Root.startswith("//"))
+    Res = Root.substr(2);
+
+  path::append(Res, path::relative_path(Abs));
+  return Res.str();
+}
+
+CpioFile::CpioFile(std::unique_ptr<raw_fd_ostream> OS, StringRef S)
+    : OS(std::move(OS)), Basename(S) {}
+
+CpioFile *CpioFile::create(StringRef OutputPath) {
+  std::string Path = (OutputPath + ".cpio").str();
+  std::error_code EC;
+  auto OS = llvm::make_unique<raw_fd_ostream>(Path, EC, fs::F_None);
+  if (EC) {
+    error(EC, "--reproduce: failed to open " + Path);
+    return nullptr;
+  }
+  return new CpioFile(std::move(OS), path::filename(OutputPath));
+}
+
+static void writeMember(raw_fd_ostream &OS, StringRef Path, StringRef Data) {
+  // The c_dev/c_ino pair should be unique according to the spec,
+  // but no one seems to care.
+  OS << "070707";                        // c_magic
+  OS << "000000";                        // c_dev
+  OS << "000000";                        // c_ino
+  OS << "100664";                        // c_mode: C_ISREG | rw-rw-r--
+  OS << "000000";                        // c_uid
+  OS << "000000";                        // c_gid
+  OS << "000001";                        // c_nlink
+  OS << "000000";                        // c_rdev
+  OS << "00000000000";                   // c_mtime
+  OS << format("%06o", Path.size() + 1); // c_namesize
+  OS << format("%011o", Data.size());    // c_filesize
+  OS << Path << '\0';                    // c_name
+  OS << Data;                            // c_filedata
+}
+
+void CpioFile::append(StringRef Path, StringRef Data) {
+  if (!Seen.insert(Path).second)
+    return;
+
+  // Construct an in-archive filename so that /home/foo/bar is stored
+  // as baz/home/foo/bar where baz is the basename of the output file.
+  // (i.e. in that case we are creating baz.cpio.)
+  SmallString<128> Fullpath;
+  path::append(Fullpath, Basename, Path);
+
+  // Use unix path separators so the cpio can be extracted on both unix and
+  // windows.
+  std::replace(Fullpath.begin(), Fullpath.end(), '\\', '/');
+
+  writeMember(*OS, Fullpath, Data);
+
+  // Print the trailer and seek back.
+  // This way we have a valid archive if we crash.
+  uint64_t Pos = OS->tell();
+  writeMember(*OS, "TRAILER!!!", "");
+  OS->seek(Pos);
+}
+
+// Quote a given string if it contains a space character.
+static std::string quote(StringRef S) {
+  if (S.find(' ') == StringRef::npos)
+    return S;
+  return ("\"" + S + "\"").str();
+}
+
+static std::string rewritePath(StringRef S) {
+  if (fs::exists(S))
+    return relativeToRoot(S);
+  return S;
+}
+
+static std::string stringize(opt::Arg *Arg) {
+  std::string K = Arg->getSpelling();
+  if (Arg->getNumValues() == 0)
+    return K;
+  std::string V = quote(Arg->getValue());
+  if (Arg->getOption().getRenderStyle() == opt::Option::RenderJoinedStyle)
+    return K + V;
+  return K + " " + V;
+}
+
+// Reconstructs command line arguments so that so that you can re-run
+// the same command with the same inputs. This is for --reproduce.
+std::string elf::createResponseFile(const opt::InputArgList &Args) {
+  SmallString<0> Data;
+  raw_svector_ostream OS(Data);
+
+  // Copy the command line to the output while rewriting paths.
+  for (auto *Arg : Args) {
+    switch (Arg->getOption().getID()) {
+    case OPT_reproduce:
+      break;
+    case OPT_INPUT:
+      OS << quote(rewritePath(Arg->getValue())) << "\n";
+      break;
+    case OPT_L:
+    case OPT_dynamic_list:
+    case OPT_rpath:
+    case OPT_alias_script_T:
+    case OPT_script:
+    case OPT_version_script:
+      OS << Arg->getSpelling() << " "
+         << quote(rewritePath(Arg->getValue())) << "\n";
+      break;
+    default:
+      OS << stringize(Arg) << "\n";
+    }
+  }
+  return Data.str();
+}
+
+std::string elf::findFromSearchPaths(StringRef Path) {
+  for (StringRef Dir : Config->SearchPaths) {
+    std::string FullPath = buildSysrootedPath(Dir, Path);
+    if (fs::exists(FullPath))
+      return FullPath;
+  }
+  return "";
+}
+
+// Searches a given library from input search paths, which are filled
+// from -L command line switches. Returns a path to an existent library file.
+std::string elf::searchLibrary(StringRef Path) {
+  if (Path.startswith(":"))
+    return findFromSearchPaths(Path.substr(1));
+  for (StringRef Dir : Config->SearchPaths) {
+    if (!Config->Static) {
+      std::string S = buildSysrootedPath(Dir, ("lib" + Path + ".so").str());
+      if (fs::exists(S))
+        return S;
+    }
+    std::string S = buildSysrootedPath(Dir, ("lib" + Path + ".a").str());
+    if (fs::exists(S))
+      return S;
+  }
+  return "";
+}
+
+// Makes a path by concatenating Dir and File.
+// If Dir starts with '=' the result will be preceded by Sysroot,
+// which can be set with --sysroot command line switch.
+std::string elf::buildSysrootedPath(StringRef Dir, StringRef File) {
+  SmallString<128> Path;
+  if (Dir.startswith("="))
+    path::append(Path, Config->Sysroot, Dir.substr(1), File);
+  else
+    path::append(Path, Dir, File);
+  return Path.str();
+}