1 files changed, 120 insertions, 0 deletions
diff --git a/ELF/DriverUtils.cpp b/ELF/DriverUtils.cpp
new file mode 100644
index 0000000000000..51b500bebf496
--- /dev/null
+++ b/ELF/DriverUtils.cpp
@@ -0,0 +1,120 @@
+//===- 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 "llvm/ADT/STLExtras.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 lld;
+using namespace lld::elf2;
+
+// 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 infoTable[] = {
+#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
+};
+
+class ELFOptTable : public opt::OptTable {
+public:
+  ELFOptTable() : OptTable(infoTable) {}
+};
+
+// Parses a given list of options.
+opt::InputArgList lld::elf2::parseArgs(llvm::BumpPtrAllocator *A,
+                                       ArrayRef<const char *> Argv) {
+  // Make InputArgList from string vectors.
+  ELFOptTable Table;
+  unsigned MissingIndex;
+  unsigned MissingCount;
+
+  // Expand response files. '@<filename>' is replaced by the file's contents.
+  SmallVector<const char *, 256> Vec(Argv.data(), Argv.data() + Argv.size());
+  StringSaver Saver(*A);
+  llvm::cl::ExpandResponseFiles(Saver, llvm::cl::TokenizeGNUCommandLine, Vec);
+
+  // Parse options and then do error checking.
+  opt::InputArgList Args = Table.ParseArgs(Vec, MissingIndex, MissingCount);
+  if (MissingCount)
+    error(Twine("missing arg value for \"") + Args.getArgString(MissingIndex) +
+          "\", expected " + Twine(MissingCount) +
+          (MissingCount == 1 ? " argument.\n" : " arguments"));
+
+  iterator_range<opt::arg_iterator> Unknowns = Args.filtered(OPT_UNKNOWN);
+  for (auto *Arg : Unknowns)
+    warning("warning: unknown argument: " + Arg->getSpelling());
+  if (Unknowns.begin() != Unknowns.end())
+    error("unknown argument(s) found");
+
+  return Args;
+}
+
+std::string lld::elf2::findFromSearchPaths(StringRef Path) {
+  for (StringRef Dir : Config->SearchPaths) {
+    std::string FullPath = buildSysrootedPath(Dir, Path);
+    if (sys::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 lld::elf2::searchLibrary(StringRef Path) {
+  std::vector<std::string> Names;
+  if (Path[0] == ':') {
+    Names.push_back(Path.drop_front());
+  } else {
+    if (!Config->Static)
+      Names.push_back(("lib" + Path + ".so").str());
+    Names.push_back(("lib" + Path + ".a").str());
+  }
+  for (const std::string &Name : Names) {
+    std::string S = findFromSearchPaths(Name);
+    if (!S.empty())
+      return S;
+  }
+  error("Unable to find library -l" + Path);
+}
+
+// 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 lld::elf2::buildSysrootedPath(StringRef Dir, StringRef File) {
+  SmallString<128> Path;
+  if (Dir.startswith("="))
+    sys::path::append(Path, Config->Sysroot, Dir.substr(1), File);
+  else
+    sys::path::append(Path, Dir, File);
+  return Path.str();
+}