From a38cfc50fcf9df006aaa192a95971c1a06103114 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Sun, 4 Dec 2022 13:52:42 -0800
Subject: [PATCH] [llvm] Use std::nullopt instead of None (NFC)

I've verified that every change in this patch affects generated files
and would reduce the number of warnings if None were deprecated.

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
---
 llvm/lib/DebugInfo/Symbolize/MarkupFilter.cpp | 2 +-
 llvm/lib/MC/MCTargetOptionsCommandFlags.cpp   | 2 +-
 llvm/utils/TableGen/AsmMatcherEmitter.cpp     | 2 +-
 llvm/utils/TableGen/GICombinerEmitter.cpp     | 6 +++---
 llvm/utils/TableGen/RegisterInfoEmitter.cpp   | 4 ++--
 llvm/utils/TableGen/SubtargetEmitter.cpp      | 4 ++--
 6 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/llvm/lib/DebugInfo/Symbolize/MarkupFilter.cpp b/llvm/lib/DebugInfo/Symbolize/MarkupFilter.cpp
index 0ec437e2c002..c3b1e4d5b271 100644
--- a/llvm/lib/DebugInfo/Symbolize/MarkupFilter.cpp
+++ b/llvm/lib/DebugInfo/Symbolize/MarkupFilter.cpp
@@ -496,7 +496,7 @@ void MarkupFilter::printValue(Twine Value) {
 #define ASSIGN_OR_RETURN_NONE(TYPE, NAME, EXPR)                                \
   auto NAME##Opt = (EXPR);                                                     \
   if (!NAME##Opt)                                                              \
-    return None;                                                               \
+    return std::nullopt;                                                       \
   TYPE NAME = std::move(*NAME##Opt)
 
 Optional<MarkupFilter::Module>
diff --git a/llvm/lib/MC/MCTargetOptionsCommandFlags.cpp b/llvm/lib/MC/MCTargetOptionsCommandFlags.cpp
index 575a2b2f82f2..0667ca59830c 100644
--- a/llvm/lib/MC/MCTargetOptionsCommandFlags.cpp
+++ b/llvm/lib/MC/MCTargetOptionsCommandFlags.cpp
@@ -31,7 +31,7 @@ using namespace llvm;
       TY res = *NAME##View;                                                    \
       return res;                                                              \
     }                                                                          \
-    return None;                                                               \
+    return std::nullopt;                                                       \
   }
 
 MCOPT_EXP(bool, RelaxAll)
diff --git a/llvm/utils/TableGen/AsmMatcherEmitter.cpp b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
index e6370a079b36..c13e5b5deff6 100644
--- a/llvm/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
@@ -3947,7 +3947,7 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
     OS << "        MII.getDeprecatedInfo(Inst, getSTI(), Info)) {\n";
     OS << "      SMLoc Loc = ((" << Target.getName()
        << "Operand &)*Operands[0]).getStartLoc();\n";
-    OS << "      getParser().Warning(Loc, Info, None);\n";
+    OS << "      getParser().Warning(Loc, Info, std::nullopt);\n";
     OS << "    }\n";
   }
 
diff --git a/llvm/utils/TableGen/GICombinerEmitter.cpp b/llvm/utils/TableGen/GICombinerEmitter.cpp
index 14f24654c7ad..6890bbfbd137 100644
--- a/llvm/utils/TableGen/GICombinerEmitter.cpp
+++ b/llvm/utils/TableGen/GICombinerEmitter.cpp
@@ -647,7 +647,7 @@ void GICombinerEmitter::emitNameMatcher(raw_ostream &OS) const {
   StringMatcher Matcher("RuleIdentifier", Cases, OS);
   Matcher.Emit();
   OS << "#endif // ifndef NDEBUG\n\n"
-     << "  return None;\n"
+     << "  return std::nullopt;\n"
      << "}\n";
 }
 
@@ -960,7 +960,7 @@ void GICombinerEmitter::run(raw_ostream &OS) {
      << "    const auto Last = "
         "getRuleIdxForIdentifier(RangePair.second);\n"
      << "    if (!First || !Last)\n"
-     << "      return None;\n"
+     << "      return std::nullopt;\n"
      << "    if (First >= Last)\n"
      << "      report_fatal_error(\"Beginning of range should be before "
         "end of range\");\n"
@@ -971,7 +971,7 @@ void GICombinerEmitter::run(raw_ostream &OS) {
      << "  }\n"
      << "  const auto I = getRuleIdxForIdentifier(RangePair.first);\n"
      << "  if (!I)\n"
-     << "    return None;\n"
+     << "    return std::nullopt;\n"
      << "  return {{*I, *I + 1}};\n"
      << "}\n\n";
 
diff --git a/llvm/utils/TableGen/RegisterInfoEmitter.cpp b/llvm/utils/TableGen/RegisterInfoEmitter.cpp
index 4d75d3020383..1707574cac98 100644
--- a/llvm/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/llvm/utils/TableGen/RegisterInfoEmitter.cpp
@@ -1690,7 +1690,7 @@ RegisterInfoEmitter::runTargetDesc(raw_ostream &OS, CodeGenTarget &Target,
     OS << "  };\n";
     OS << "  return makeArrayRef(Masks);\n";
   } else {
-    OS << "  return None;\n";
+    OS << "  return std::nullopt;\n";
   }
   OS << "}\n\n";
 
@@ -1756,7 +1756,7 @@ RegisterInfoEmitter::runTargetDesc(raw_ostream &OS, CodeGenTarget &Target,
     OS << "  };\n";
     OS << "  return makeArrayRef(Names);\n";
   } else {
-    OS << "  return None;\n";
+    OS << "  return std::nullopt;\n";
   }
   OS << "}\n\n";
 
diff --git a/llvm/utils/TableGen/SubtargetEmitter.cpp b/llvm/utils/TableGen/SubtargetEmitter.cpp
index 0509f8540117..8352c22ac478 100644
--- a/llvm/utils/TableGen/SubtargetEmitter.cpp
+++ b/llvm/utils/TableGen/SubtargetEmitter.cpp
@@ -1862,7 +1862,7 @@ void SubtargetEmitter::run(raw_ostream &OS) {
   if (NumFeatures)
     OS << Target << "FeatureKV, ";
   else
-    OS << "None, ";
+    OS << "std::nullopt, ";
   if (NumProcs)
     OS << Target << "SubTypeKV, ";
   else
@@ -1955,7 +1955,7 @@ void SubtargetEmitter::run(raw_ostream &OS) {
   if (NumFeatures)
     OS << "makeArrayRef(" << Target << "FeatureKV, " << NumFeatures << "), ";
   else
-    OS << "None, ";
+    OS << "std::nullopt, ";
   if (NumProcs)
     OS << "makeArrayRef(" << Target << "SubTypeKV, " << NumProcs << "), ";
   else