[PATCH] D64564: Loop pragma parsing. NFC.

[Sjoerd Meijer via Phabricator via cfe-commits]

SjoerdMeijer created this revision.
SjoerdMeijer added reviewers: samparker, dmgreen, Meinersbur.

Yesterday I was a bit distracted by loop pragma parsing (D64471 <https://reviews.llvm.org/D64471>), but still am a bit today too (this patch).


https://reviews.llvm.org/D64564

Files:
  clang/lib/Parse/ParsePragma.cpp


Index: clang/lib/Parse/ParsePragma.cpp
===================================================================
--- clang/lib/Parse/ParsePragma.cpp
+++ clang/lib/Parse/ParsePragma.cpp
@@ -1006,18 +1006,14 @@
 } // end anonymous namespace
 
 static std::string PragmaLoopHintString(Token PragmaName, Token Option) {
-  std::string PragmaString;
-  if (PragmaName.getIdentifierInfo()->getName() == "loop") {
-    PragmaString = "clang loop ";
-    PragmaString += Option.getIdentifierInfo()->getName();
-  } else if (PragmaName.getIdentifierInfo()->getName() == "unroll_and_jam") {
-    PragmaString = "unroll_and_jam";
-  } else {
-    assert(PragmaName.getIdentifierInfo()->getName() == "unroll" &&
-           "Unexpected pragma name");
-    PragmaString = "unroll";
-  }
-  return PragmaString;
+  std::string Str = PragmaName.getIdentifierInfo()->getName();
+  Str = llvm::StringSwitch<std::string>(Str)
+               .Case("loop", std::string("clang loop ") + Str)
+               .Case("unroll_and_jam", Str)
+               .Case("unroll", Str)
+               .Default("");
+  assert(Str.size() && "Unexpected pragma name");
+  return Str;
 }
 
 bool Parser::HandlePragmaLoopHint(LoopHint &Hint) {
@@ -1041,12 +1037,12 @@
 
   // Return a valid hint if pragma unroll or nounroll were specified
   // without an argument.
-  bool PragmaUnroll = PragmaNameInfo->getName() == "unroll";
-  bool PragmaNoUnroll = PragmaNameInfo->getName() == "nounroll";
-  bool PragmaUnrollAndJam = PragmaNameInfo->getName() == "unroll_and_jam";
-  bool PragmaNoUnrollAndJam = PragmaNameInfo->getName() == "nounroll_and_jam";
-  if (Toks.empty() && (PragmaUnroll || PragmaNoUnroll || PragmaUnrollAndJam ||
-                       PragmaNoUnrollAndJam)) {
+  const bool LoopHint = llvm::StringSwitch<bool>(PragmaNameInfo->getName())
+                            .Cases("unroll", "nounroll", "unroll_and_jam",
+                                   "nounroll_and_jam", true)
+                            .Default(false);
+
+  if (Toks.empty() && LoopHint) {
     ConsumeAnnotationToken();
     Hint.Range = Info->PragmaName.getLocation();
     return true;


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