Delete unused code in WebKit checkers (llvm#171768)

(cherry picked from commit 1307b77)

Author: rniwa

clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp

@@ -300,37 +300,6 @@ bool RetainTypeChecker::isUnretained(const QualType QT, bool ignoreARC) {
   return RT && CFPointees.contains(RT);
 }
 
-std::optional<bool> isUnretained(const QualType T, bool IsARCEnabled) {
-  if (auto *Subst = dyn_cast<SubstTemplateTypeParmType>(T)) {
-    if (auto *Decl = Subst->getAssociatedDecl()) {
-      if (isRetainPtrOrOSPtr(safeGetName(Decl)))
-        return false;
-    }
-  }
-  if ((ento::cocoa::isCocoaObjectRef(T) && !IsARCEnabled) ||
-      ento::coreFoundation::isCFObjectRef(T))
-    return true;
-
-  // RetainPtr strips typedef for CF*Ref. Manually check for struct __CF* types.
-  auto CanonicalType = T.getCanonicalType();
-  auto *Type = CanonicalType.getTypePtrOrNull();
-  if (!Type)
-    return false;
-  auto Pointee = Type->getPointeeType();
-  auto *PointeeType = Pointee.getTypePtrOrNull();
-  if (!PointeeType)
-    return false;
-  auto *Record = PointeeType->getAsStructureType();
-  if (!Record)
-    return false;
-  auto *Decl = Record->getDecl();
-  if (!Decl)
-    return false;
-  auto TypeName = Decl->getName();
-  return TypeName.starts_with("__CF") || TypeName.starts_with("__CG") ||
-         TypeName.starts_with("__CM");
-}
-
 std::optional<bool> isUncounted(const CXXRecordDecl* Class)
 {
   // Keep isRefCounted first as it's cheaper.
@@ -366,25 +335,6 @@ std::optional<bool> isUncheckedPtr(const QualType T) {
   return false;
 }
 
-std::optional<bool> isUnsafePtr(const QualType T, bool IsArcEnabled) {
-  if (T->isPointerType() || T->isReferenceType()) {
-    if (auto *CXXRD = T->getPointeeCXXRecordDecl()) {
-      auto isUncountedPtr = isUncounted(CXXRD);
-      auto isUncheckedPtr = isUnchecked(CXXRD);
-      auto isUnretainedPtr = isUnretained(T, IsArcEnabled);
-      std::optional<bool> result;
-      if (isUncountedPtr)
-        result = *isUncountedPtr;
-      if (isUncheckedPtr)
-        result = result ? *result || *isUncheckedPtr : *isUncheckedPtr;
-      if (isUnretainedPtr)
-        result = result ? *result || *isUnretainedPtr : *isUnretainedPtr;
-      return result;
-    }
-  }
-  return false;
-}
-
 std::optional<bool> isGetterOfSafePtr(const CXXMethodDecl *M) {
   assert(M);
 

clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.h

@@ -87,10 +87,6 @@ class RetainTypeChecker {
   bool defaultSynthProperties() const { return DefaultSynthProperties; }
 };
 
-/// \returns true if \p Class is NS or CF objects AND not retained, false if
-/// not, std::nullopt if inconclusive.
-std::optional<bool> isUnretained(const clang::QualType T, bool IsARCEnabled);
-
 /// \returns true if \p Class is ref-countable AND not ref-counted, false if
 /// not, std::nullopt if inconclusive.
 std::optional<bool> isUncounted(const clang::CXXRecordDecl* Class);
@@ -107,10 +103,6 @@ std::optional<bool> isUncountedPtr(const clang::QualType T);
 /// class, false if not, std::nullopt if inconclusive.
 std::optional<bool> isUncheckedPtr(const clang::QualType T);
 
-/// \returns true if \p T is either a raw pointer or reference to an uncounted
-/// or unchecked class, false if not, std::nullopt if inconclusive.
-std::optional<bool> isUnsafePtr(const QualType T, bool IsArcEnabled);
-
 /// \returns true if \p T is a RefPtr, Ref, CheckedPtr, CheckedRef, or its
 /// variant, false if not.
 bool isRefOrCheckedPtrType(const clang::QualType T);