[NFC][llvm-dwp] Switch from llvm::cl to OptTable

Switch the parse of command line options from llvm::cl to OptTable.

The motivation for this change is to continue adding llvm based tools
to the llvm driver multicall. For more information about the proposal
and motivation, please see https://discourse.llvm.org/t/rfc-llvm-busybox-proposal/58494

Reviewed By: abrachet

Differential Revision: https://reviews.llvm.org/D154642

1 files changed, 68 insertions, 20 deletions

diff --git a/llvm/tools/llvm-dwp/llvm-dwp.cpp b/llvm/tools/llvm-dwp/llvm-dwp.cpp
index b465cf6..350a373 100644
--- a/llvm/tools/llvm-dwp/llvm-dwp.cpp
+++ b/llvm/tools/llvm-dwp/llvm-dwp.cpp
@@ -23,6 +23,8 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
 #include "llvm/MC/TargetRegistry.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Option/Option.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/InitLLVM.h"
@@ -36,26 +38,46 @@ using namespace llvm::object;
 
 static mc::RegisterMCTargetOptionsFlags MCTargetOptionsFlags;
 
-cl::OptionCategory DwpCategory("Specific Options");
-static cl::list<std::string>
-    InputFiles(cl::Positional, cl::desc("<input files>"), cl::cat(DwpCategory));
+// Command-line option boilerplate.
+namespace {
+enum ID {
+  OPT_INVALID = 0, // This is not an option ID.
+#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
+               HELPTEXT, METAVAR, VALUES)                                      \
+  OPT_##ID,
+#include "Opts.inc"
+#undef OPTION
+};
 
-static cl::list<std::string> ExecFilenames(
-    "e",
-    cl::desc(
-        "Specify the executable/library files to get the list of *.dwo from"),
-    cl::value_desc("filename"), cl::cat(DwpCategory));
+#define PREFIX(NAME, VALUE)                                                    \
+  static constexpr StringLiteral NAME##_init[] = VALUE;                        \
+  static constexpr ArrayRef<StringLiteral> NAME(NAME##_init,                   \
+                                                std::size(NAME##_init) - 1);
+#include "Opts.inc"
+#undef PREFIX
 
-static cl::opt<std::string> OutputFilename(cl::Required, "o",
-                                           cl::desc("Specify the output file."),
-                                           cl::value_desc("filename"),
-                                           cl::cat(DwpCategory));
+static constexpr opt::OptTable::Info InfoTable[] = {
+#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
+               HELPTEXT, METAVAR, VALUES)                                      \
+  {                                                                            \
+      PREFIX,      NAME,      HELPTEXT,                                        \
+      METAVAR,     OPT_##ID,  opt::Option::KIND##Class,                        \
+      PARAM,       FLAGS,     OPT_##GROUP,                                     \
+      OPT_##ALIAS, ALIASARGS, VALUES},
+#include "Opts.inc"
+#undef OPTION
+};
 
-static cl::opt<bool> ContinueOnCuIndexOverflow(
-    "continue-on-cu-index-overflow",
-    cl::desc("This turns an error when offset for .debug_*.dwo sections "
-             "overfolws into a warning."),
-    cl::cat(DwpCategory));
+class DwpOptTable : public opt::GenericOptTable {
+public:
+  DwpOptTable() : GenericOptTable(InfoTable) {}
+};
+} // end anonymous namespace
+
+// Options
+static std::vector<std::string> ExecFilenames;
+static std::string OutputFilename;
+static bool ContinueOnCuIndexOverflow;
 
 static Expected<SmallVector<std::string, 16>>
 getDWOFilenames(StringRef ExecFilename) {
@@ -106,15 +128,41 @@ static Expected<Triple> readTargetTriple(StringRef FileName) {
 int main(int argc, char **argv) {
   InitLLVM X(argc, argv);
 
-  cl::HideUnrelatedOptions({&DwpCategory, &getColorCategory()});
-  cl::ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files\n");
+  DwpOptTable Tbl;
+  llvm::BumpPtrAllocator A;
+  llvm::StringSaver Saver{A};
+  opt::InputArgList Args =
+      Tbl.parseArgs(argc, argv, OPT_UNKNOWN, Saver, [&](StringRef Msg) {
+        llvm::errs() << Msg << '\n';
+        std::exit(1);
+      });
+
+  if (Args.hasArg(OPT_help)) {
+    Tbl.printHelp(llvm::outs(), "llvm-dwp [options] <input files>",
+                  "merge split dwarf (.dwo) files");
+    std::exit(0);
+  }
+
+  if (Args.hasArg(OPT_version)) {
+    llvm::cl::PrintVersionMessage();
+    std::exit(0);
+  }
+
+  OutputFilename = Args.getLastArgValue(OPT_outputFileName, "");
+  ContinueOnCuIndexOverflow = Args.hasArg(OPT_continueOnCuIndexOverflow);
+
+  for (const llvm::opt::Arg *A : Args.filtered(OPT_execFileNames))
+    ExecFilenames.emplace_back(A->getValue());
+
+  std::vector<std::string> DWOFilenames;
+  for (const llvm::opt::Arg *A : Args.filtered(OPT_INPUT))
+    DWOFilenames.emplace_back(A->getValue());
 
   llvm::InitializeAllTargetInfos();
   llvm::InitializeAllTargetMCs();
   llvm::InitializeAllTargets();
   llvm::InitializeAllAsmPrinters();
 
-  std::vector<std::string> DWOFilenames = InputFiles;
   for (const auto &ExecFilename : ExecFilenames) {
     auto DWOs = getDWOFilenames(ExecFilename);
     if (!DWOs) {