Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp

@@ -0,0 +1,171 @@
+//===- 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-link /lib.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ToolDrivers/llvm-lib/LibDriver.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/BinaryFormat/Magic.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/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/StringSaver.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, _12) OPT_##ID,
+#include "Options.inc"
+#undef OPTION
+};
+
+#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
+#include "Options.inc"
+#undef PREFIX
+
+static const opt::OptTable::Info InfoTable[] = {
+#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12)      \
+  {X1, X2, X10,         X11,         OPT_##ID, opt::Option::KIND##Class,       \
+   X9, X8, OPT_##GROUP, OPT_##ALIAS, X7,       X12},
+#include "Options.inc"
+#undef OPTION
+};
+
+class LibOptTable : public opt::OptTable {
+public:
+  LibOptTable() : OptTable(InfoTable, true) {}
+};
+
+}
+
+static std::string getOutputPath(opt::InputArgList *Args,
+                                 const NewArchiveMember &FirstMember) {
+  if (auto *Arg = Args->getLastArg(OPT_out))
+    return Arg->getValue();
+  SmallString<128> Val = StringRef(FirstMember.Buf->getBufferIdentifier());
+  sys::path::replace_extension(Val, ".lib");
+  return Val.str();
+}
+
+static std::vector<StringRef> getSearchPaths(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 std::string findInputFile(StringRef File, ArrayRef<StringRef> Paths) {
+  for (StringRef Dir : Paths) {
+    SmallString<128> Path = Dir;
+    sys::path::append(Path, File);
+    if (sys::fs::exists(Path))
+      return Path.str().str();
+  }
+  return "";
+}
+
+int llvm::libDriverMain(ArrayRef<const char *> ArgsArr) {
+  BumpPtrAllocator Alloc;
+  StringSaver Saver(Alloc);
+
+  // Parse command line arguments.
+  SmallVector<const char *, 20> NewArgs(ArgsArr.begin(), ArgsArr.end());
+  cl::ExpandResponseFiles(Saver, cl::TokenizeWindowsCommandLine, NewArgs);
+  ArgsArr = NewArgs;
+
+  LibOptTable Table;
+  unsigned MissingIndex;
+  unsigned MissingCount;
+  opt::InputArgList Args =
+      Table.ParseArgs(ArgsArr.slice(1), 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 no input files, silently do nothing to match lib.exe.
+  if (!Args.hasArgNoClaim(OPT_INPUT))
+    return 0;
+
+  std::vector<StringRef> SearchPaths = getSearchPaths(&Args, Saver);
+
+  // Create a NewArchiveMember for each input file.
+  std::vector<NewArchiveMember> Members;
+  for (auto *Arg : Args.filtered(OPT_INPUT)) {
+    std::string Path = findInputFile(Arg->getValue(), SearchPaths);
+    if (Path.empty()) {
+      llvm::errs() << Arg->getValue() << ": no such file or directory\n";
+      return 1;
+    }
+
+    Expected<NewArchiveMember> MOrErr =
+        NewArchiveMember::getFile(Saver.save(Path), /*Deterministic=*/true);
+    if (!MOrErr) {
+      handleAllErrors(MOrErr.takeError(), [&](const ErrorInfoBase &EIB) {
+        llvm::errs() << Arg->getValue() << ": " << EIB.message() << "\n";
+      });
+      return 1;
+    }
+
+    file_magic Magic = identify_magic(MOrErr->Buf->getBuffer());
+    if (Magic != file_magic::coff_object && Magic != file_magic::bitcode &&
+        Magic != file_magic::windows_resource) {
+      llvm::errs() << Arg->getValue()
+                   << ": not a COFF object, bitcode or resource file\n";
+      return 1;
+    }
+    Members.emplace_back(std::move(*MOrErr));
+  }
+
+  // Create an archive file.
+  std::string OutputPath = getOutputPath(&Args, Members[0]);
+  if (Error E =
+          writeArchive(OutputPath, Members,
+                       /*WriteSymtab=*/true, object::Archive::K_GNU,
+                       /*Deterministic*/ true, Args.hasArg(OPT_llvmlibthin))) {
+    handleAllErrors(std::move(E), [&](const ErrorInfoBase &EI) {
+      llvm::errs() << OutputPath << ": " << EI.message() << "\n";
+    });
+    return 1;
+  }
+
+  return 0;
+}