[lldb] Let table gen create command option initializers.

Summary:
We currently have man large arrays containing initializers for our command options.
These tables are tricky maintain as we don't have any good place to check them for consistency and
it's also hard to read (`nullptr, {}, 0` is not very descriptive).

This patch fixes this by letting table gen generate those tables. This way we can have a more readable
syntax for this (especially for all the default arguments) and we can let TableCheck check them
for consistency (e.g. an option with an optional argument can't have `eArgTypeNone`, naming of flags', etc.).

Also refactoring the related data structures can now be done without changing the hundred of option initializers.

For example, this line:
```
{LLDB_OPT_SET_ALL, false, "hide-aliases",         'a', OptionParser::eNoArgument, nullptr, {}, 0, eArgTypeNone, "Hide aliases in the command list."},
```
becomes this:
```
  def hide_aliases : Option<"hide-aliases", "a">, Desc<"Hide aliases in the command list.">;
```

For now I just moved a few initializers to the new format to demonstrate the change. I'll slowly migrate the other
option initializers tables  in separate patches.

Reviewers: JDevlieghere, davide, sgraenitz

Reviewed By: JDevlieghere

Subscribers: jingham, xiaobai, labath, mgorny, abidh, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D64365

llvm-svn: 365908

1 files changed, 71 insertions, 0 deletions

diff --git a/lldb/utils/TableGen/LLDBTableGen.cpp b/lldb/utils/TableGen/LLDBTableGen.cpp
new file mode 100644
index 00000000000..9325fe03856
--- /dev/null
+++ b/lldb/utils/TableGen/LLDBTableGen.cpp
@@ -0,0 +1,71 @@
+//===- TableGen.cpp - Top-Level TableGen implementation for Clang ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the main function for Clang's TableGen.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LLDBTableGenBackends.h" // Declares all backends.
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Main.h"
+#include "llvm/TableGen/Record.h"
+
+using namespace llvm;
+using namespace lldb_private;
+
+enum ActionType {
+  PrintRecords,
+  DumpJSON,
+  GenOptionDefs,
+};
+
+static cl::opt<ActionType>
+    Action(cl::desc("Action to perform:"),
+           cl::values(clEnumValN(PrintRecords, "print-records",
+                                 "Print all records to stdout (default)"),
+                      clEnumValN(DumpJSON, "dump-json",
+                                 "Dump all records as machine-readable JSON"),
+                      clEnumValN(GenOptionDefs, "gen-lldb-option-defs",
+                                 "Generate clang attribute clases")));
+
+static bool LLDBTableGenMain(raw_ostream &OS, RecordKeeper &Records) {
+  switch (Action) {
+  case PrintRecords:
+    OS << Records; // No argument, dump all contents
+    break;
+  case DumpJSON:
+    EmitJSON(Records, OS);
+    break;
+  case GenOptionDefs:
+    EmitOptionDefs(Records, OS);
+    break;
+  }
+  return false;
+}
+
+int main(int argc, char **argv) {
+  sys::PrintStackTraceOnErrorSignal(argv[0]);
+  PrettyStackTraceProgram X(argc, argv);
+  cl::ParseCommandLineOptions(argc, argv);
+
+  llvm_shutdown_obj Y;
+
+  return TableGenMain(argv[0], &LLDBTableGenMain);
+}
+
+#ifdef __has_feature
+#if __has_feature(address_sanitizer)
+#include <sanitizer/lsan_interface.h>
+// Disable LeakSanitizer for this binary as it has too many leaks that are not
+// very interesting to fix. See compiler-rt/include/sanitizer/lsan_interface.h .
+int __lsan_is_turned_off() { return 1; }
+#endif // __has_feature(address_sanitizer)
+#endif // defined(__has_feature)