2 files changed, 180 insertions, 0 deletions
diff --git a/contrib/llvm/lib/LibDriver/LibDriver.cpp b/contrib/llvm/lib/LibDriver/LibDriver.cpp
new file mode 100644
index 000000000000..c9857b0493d6
--- /dev/null
+++ b/contrib/llvm/lib/LibDriver/LibDriver.cpp
@@ -0,0 +1,157 @@
+//===- LibDriver.cpp - lib.exe-compatible driver --------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines an interface to a lib.exe-compatible driver that also understands
+// bitcode files. Used by llvm-lib and lld-link2 /lib.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LibDriver/LibDriver.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Object/ArchiveWriter.h"
+#include "llvm/Option/Arg.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Option/Option.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/StringSaver.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+namespace {
+
+enum {
+  OPT_INVALID = 0,
+#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11) OPT_##ID,
+#include "Options.inc"
+#undef OPTION
+};
+
+#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
+#include "Options.inc"
+#undef PREFIX
+
+static const llvm::opt::OptTable::Info infoTable[] = {
+#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10)    \
+  {                                                                    \
+    X1, X2, X9, X10, OPT_##ID, llvm::opt::Option::KIND##Class, X8, X7, \
+    OPT_##GROUP, OPT_##ALIAS, X6                                       \
+  },
+#include "Options.inc"
+#undef OPTION
+};
+
+class LibOptTable : public llvm::opt::OptTable {
+public:
+  LibOptTable() : OptTable(infoTable, llvm::array_lengthof(infoTable), true) {}
+};
+
+} // namespace
+
+static std::string getOutputPath(llvm::opt::InputArgList *Args) {
+  if (auto *Arg = Args->getLastArg(OPT_out))
+    return Arg->getValue();
+  for (auto *Arg : Args->filtered(OPT_INPUT)) {
+    if (!StringRef(Arg->getValue()).endswith_lower(".obj"))
+      continue;
+    SmallString<128> Val = StringRef(Arg->getValue());
+    llvm::sys::path::replace_extension(Val, ".lib");
+    return Val.str();
+  }
+  llvm_unreachable("internal error");
+}
+
+static std::vector<StringRef> getSearchPaths(llvm::opt::InputArgList *Args,
+                                             StringSaver &Saver) {
+  std::vector<StringRef> Ret;
+  // Add current directory as first item of the search path.
+  Ret.push_back("");
+
+  // Add /libpath flags.
+  for (auto *Arg : Args->filtered(OPT_libpath))
+    Ret.push_back(Arg->getValue());
+
+  // Add $LIB.
+  Optional<std::string> EnvOpt = sys::Process::GetEnv("LIB");
+  if (!EnvOpt.hasValue())
+    return Ret;
+  StringRef Env = Saver.save(*EnvOpt);
+  while (!Env.empty()) {
+    StringRef Path;
+    std::tie(Path, Env) = Env.split(';');
+    Ret.push_back(Path);
+  }
+  return Ret;
+}
+
+static Optional<std::string> findInputFile(StringRef File,
+                                           ArrayRef<StringRef> Paths) {
+  for (auto Dir : Paths) {
+    SmallString<128> Path = Dir;
+    sys::path::append(Path, File);
+    if (sys::fs::exists(Path))
+      return Path.str().str();
+  }
+  return Optional<std::string>();
+}
+
+int llvm::libDriverMain(int Argc, const char **Argv) {
+  SmallVector<const char *, 20> NewArgv(Argv, Argv + Argc);
+  BumpPtrAllocator Alloc;
+  BumpPtrStringSaver Saver(Alloc);
+  cl::ExpandResponseFiles(Saver, cl::TokenizeWindowsCommandLine, NewArgv);
+  Argv = &NewArgv[0];
+  Argc = static_cast<int>(NewArgv.size());
+
+  LibOptTable Table;
+  unsigned MissingIndex;
+  unsigned MissingCount;
+  std::unique_ptr<llvm::opt::InputArgList> Args(
+      Table.ParseArgs(&Argv[1], &Argv[Argc], MissingIndex, MissingCount));
+  if (MissingCount) {
+    llvm::errs() << "missing arg value for \""
+                 << Args->getArgString(MissingIndex)
+                 << "\", expected " << MissingCount
+                 << (MissingCount == 1 ? " argument.\n" : " arguments.\n");
+    return 1;
+  }
+  for (auto *Arg : Args->filtered(OPT_UNKNOWN))
+    llvm::errs() << "ignoring unknown argument: " << Arg->getSpelling() << "\n";
+
+  if (Args->filtered_begin(OPT_INPUT) == Args->filtered_end()) {
+    llvm::errs() << "no input files.\n";
+    return 1;
+  }
+
+  std::vector<StringRef> SearchPaths = getSearchPaths(Args.get(), Saver);
+
+  std::vector<llvm::NewArchiveIterator> Members;
+  for (auto *Arg : Args->filtered(OPT_INPUT)) {
+    Optional<std::string> Path = findInputFile(Arg->getValue(), SearchPaths);
+    if (!Path.hasValue()) {
+      llvm::errs() << Arg->getValue() << ": no such file or directory\n";
+      return 1;
+    }
+    Members.emplace_back(Saver.save(*Path),
+                         llvm::sys::path::filename(Arg->getValue()));
+  }
+
+  std::pair<StringRef, std::error_code> Result = llvm::writeArchive(
+      getOutputPath(Args.get()), Members, /*WriteSymtab=*/true);
+  if (Result.second) {
+    if (Result.first.empty())
+      Result.first = Argv[0];
+    llvm::errs() << Result.first << ": " << Result.second.message() << "\n";
+    return 1;
+  }
+
+  return 0;
+}
diff --git a/contrib/llvm/lib/LibDriver/Options.td b/contrib/llvm/lib/LibDriver/Options.td
new file mode 100644
index 000000000000..0aa1affbebc9
--- /dev/null
+++ b/contrib/llvm/lib/LibDriver/Options.td
@@ -0,0 +1,23 @@
+include "llvm/Option/OptParser.td"
+
+// lib.exe accepts options starting with either a dash or a slash.
+
+// Flag that takes no arguments.
+class F<string name> : Flag<["/", "-", "-?"], name>;
+
+// Flag that takes one argument after ":".
+class P<string name, string help> :
+      Joined<["/", "-", "-?"], name#":">, HelpText<help>;
+
+def libpath: P<"libpath", "Object file search path">;
+def out    : P<"out", "Path to file to write output">;
+
+//==============================================================================
+// The flags below do nothing. They are defined only for lib.exe compatibility.
+//==============================================================================
+
+class QF<string name> : Joined<["/", "-", "-?"], name#":">;
+
+def ignore : QF<"ignore">;
+def machine: QF<"machine">;
+def nologo : F<"nologo">;