[StaticAnalyzer] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

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

1 files changed, 9 insertions, 9 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp
index c5fa43ac..d7befdc 100644
--- a/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp
@@ -1095,13 +1095,13 @@ Optional<StdLibraryFunctionsChecker::Summary>
 StdLibraryFunctionsChecker::findFunctionSummary(const FunctionDecl *FD,
                                                 CheckerContext &C) const {
   if (!FD)
-    return None;
+    return std::nullopt;
 
   initFunctionSummaries(C);
 
   auto FSMI = FunctionSummaryMap.find(FD->getCanonicalDecl());
   if (FSMI == FunctionSummaryMap.end())
-    return None;
+    return std::nullopt;
   return FSMI->second;
 }
 
@@ -1110,7 +1110,7 @@ StdLibraryFunctionsChecker::findFunctionSummary(const CallEvent &Call,
                                                 CheckerContext &C) const {
   const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Call.getDecl());
   if (!FD)
-    return None;
+    return std::nullopt;
   return findFunctionSummary(FD, C);
 }
 
@@ -1135,7 +1135,7 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
       IdentifierInfo &II = ACtx.Idents.get(Name);
       auto LookupRes = ACtx.getTranslationUnitDecl()->lookup(&II);
       if (LookupRes.empty())
-        return None;
+        return std::nullopt;
 
       // Prioritze typedef declarations.
       // This is needed in case of C struct typedefs. E.g.:
@@ -1153,7 +1153,7 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
       for (Decl *D : LookupRes)
         if (auto *TD = dyn_cast<TypeDecl>(D))
           return ACtx.getTypeDeclType(TD).getCanonicalType();
-      return None;
+      return std::nullopt;
     }
   } lookupTy(ACtx);
 
@@ -1170,7 +1170,7 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
     Optional<QualType> operator()(Optional<QualType> Ty) {
       if (Ty)
         return operator()(*Ty);
-      return None;
+      return std::nullopt;
     }
   } getRestrictTy(ACtx);
   class GetPointerTy {
@@ -1182,13 +1182,13 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
     Optional<QualType> operator()(Optional<QualType> Ty) {
       if (Ty)
         return operator()(*Ty);
-      return None;
+      return std::nullopt;
     }
   } getPointerTy(ACtx);
   class {
   public:
     Optional<QualType> operator()(Optional<QualType> Ty) {
-      return Ty ? Optional<QualType>(Ty->withConst()) : None;
+      return Ty ? Optional<QualType>(Ty->withConst()) : std::nullopt;
     }
     QualType operator()(QualType Ty) { return Ty.withConst(); }
   } getConstTy;
@@ -1204,7 +1204,7 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
       if (Ty) {
         return operator()(*Ty);
       }
-      return None;
+      return std::nullopt;
     }
   } getMaxValue(BVF);