isUncountedPtr should take QualType as an argument. (#110213)

Make isUncountedPtr take QualType as an argument instead of Type*. This
simplifies some code.

Author: rniwa

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

@@ -177,14 +177,10 @@ std::optional<bool> isUncounted(const CXXRecordDecl* Class)
   return (*IsRefCountable);
 }
 
-std::optional<bool> isUncountedPtr(const Type* T)
-{
-  assert(T);
-
+std::optional<bool> isUncountedPtr(const QualType T) {
   if (T->isPointerType() || T->isReferenceType()) {
-    if (auto *CXXRD = T->getPointeeCXXRecordDecl()) {
+    if (auto *CXXRD = T->getPointeeCXXRecordDecl())
       return isUncounted(CXXRD);
-    }
   }
   return false;
 }
@@ -208,12 +204,8 @@ std::optional<bool> isGetterOfRefCounted(const CXXMethodDecl* M)
     // Ref<T> -> T conversion
     // FIXME: Currently allowing any Ref<T> -> whatever cast.
     if (isRefType(className)) {
-      if (auto *maybeRefToRawOperator = dyn_cast<CXXConversionDecl>(M)) {
-        if (auto *targetConversionType =
-                maybeRefToRawOperator->getConversionType().getTypePtrOrNull()) {
-          return isUncountedPtr(targetConversionType);
-        }
-      }
+      if (auto *maybeRefToRawOperator = dyn_cast<CXXConversionDecl>(M))
+        return isUncountedPtr(maybeRefToRawOperator->getConversionType());
     }
   }
   return false;

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

@@ -61,7 +61,7 @@ std::optional<bool> isUncounted(const clang::CXXRecordDecl* Class);
 
 /// \returns true if \p T is either a raw pointer or reference to an uncounted
 /// class, false if not, std::nullopt if inconclusive.
-std::optional<bool> isUncountedPtr(const clang::Type* T);
+std::optional<bool> isUncountedPtr(const clang::QualType T);
 
 /// \returns true if Name is a RefPtr, Ref, or its variant, false if not.
 bool isRefType(const std::string &Name);

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

@@ -115,12 +115,8 @@ class UncountedCallArgsChecker
         //  continue;
 
         QualType ArgType = (*P)->getType().getCanonicalType();
-        const auto *TypePtr = ArgType.getTypePtrOrNull();
-        if (!TypePtr)
-          continue; // FIXME? Should we bail?
-
         // FIXME: more complex types (arrays, references to raw pointers, etc)
-        std::optional<bool> IsUncounted = isUncountedPtr(TypePtr);
+        std::optional<bool> IsUncounted = isUncountedPtr(ArgType);
         if (!IsUncounted || !(*IsUncounted))
           continue;
 

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

@@ -59,11 +59,11 @@ class UncountedLambdaCapturesChecker
     for (const LambdaCapture &C : L->captures()) {
       if (C.capturesVariable()) {
         ValueDecl *CapturedVar = C.getCapturedVar();
-        if (auto *CapturedVarType = CapturedVar->getType().getTypePtrOrNull()) {
-            std::optional<bool> IsUncountedPtr = isUncountedPtr(CapturedVarType);
-            if (IsUncountedPtr && *IsUncountedPtr) {
-                reportBug(C, CapturedVar, CapturedVarType);
-            }
+        QualType CapturedVarQualType = CapturedVar->getType();
+        if (auto *CapturedVarType = CapturedVarQualType.getTypePtrOrNull()) {
+          auto IsUncountedPtr = isUncountedPtr(CapturedVarQualType);
+          if (IsUncountedPtr && *IsUncountedPtr)
+            reportBug(C, CapturedVar, CapturedVarType);
         }
       }
     }

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

@@ -199,11 +199,7 @@ class UncountedLocalVarsChecker
     if (shouldSkipVarDecl(V))
       return;
 
-    const auto *ArgType = V->getType().getTypePtr();
-    if (!ArgType)
-      return;
-
-    std::optional<bool> IsUncountedPtr = isUncountedPtr(ArgType);
+    std::optional<bool> IsUncountedPtr = isUncountedPtr(V->getType());
     if (IsUncountedPtr && *IsUncountedPtr) {
       if (tryToFindPtrOrigin(
               Value, /*StopAtFirstRefCountedObj=*/false,