[clang-tblgen] Add -print-records and -dump-json modes.

Currently, if clang-tblgen is run without a mode option, it defaults
to the first mode in its 'enum Action', which happens to be
-gen-clang-attr-classes. I think it makes more sense for it to behave
the same way as llvm-tblgen, i.e. print a diagnostic dump if it's not
given any more specific instructions.

I've also added the same -dump-json that llvm-tblgen supports. This
means any tblgen command line (whether llvm- or clang-) can be
mechanically turned into one that processes the same input into JSON.

Reviewers: nhaehnle

Reviewed By: nhaehnle

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D50771

llvm-svn: 340390

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/utils/TableGen/TableGen.cpp b/clang/utils/TableGen/TableGen.cpp
index a2ba131628f..c02fa3d170c 100644
--- a/clang/utils/TableGen/TableGen.cpp
+++ b/clang/utils/TableGen/TableGen.cpp
@@ -23,6 +23,8 @@ using namespace llvm;
 using namespace clang;
 
 enum ActionType {
+  PrintRecords,
+  DumpJSON,
   GenClangAttrClasses,
   GenClangAttrParserStringSwitches,
   GenClangAttrSubjectMatchRulesParserStringSwitches,
@@ -66,6 +68,10 @@ namespace {
 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(GenClangAttrClasses, "gen-clang-attr-classes",
                    "Generate clang attribute clases"),
         clEnumValN(GenClangAttrParserStringSwitches,
@@ -164,6 +170,12 @@ ClangComponent("clang-component",
 
 bool ClangTableGenMain(raw_ostream &OS, RecordKeeper &Records) {
   switch (Action) {
+  case PrintRecords:
+    OS << Records;           // No argument, dump all contents
+    break;
+  case DumpJSON:
+    EmitJSON(Records, OS);
+    break;
   case GenClangAttrClasses:
     EmitClangAttrClass(Records, OS);
     break;