[alpha.webkit.NoUnretainedMemberChecker] Recognize NS_REQUIRES_PROPERTY_DEFINITIONS

Allow @Property of a raw pointer when NS_REQUIRES_PROPERTY_DEFINITIONS is specified on the interface
since such an interface does not automatically synthesize raw pointer ivars.

Also emit a warning for @Property(assign) and @Property(unsafe_unretained) under ARC.

Author: rniwa

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

@@ -236,6 +236,7 @@ std::optional<bool> isUnchecked(const QualType T) {
 void RetainTypeChecker::visitTranslationUnitDecl(
     const TranslationUnitDecl *TUD) {
   IsARCEnabled = TUD->getLangOpts().ObjCAutoRefCount;
+  DefaultSynthProperties = TUD->getLangOpts().ObjCDefaultSynthProperties;
 }
 
 void RetainTypeChecker::visitTypedef(const TypedefDecl *TD) {

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

@@ -76,12 +76,14 @@ class RetainTypeChecker {
   llvm::DenseSet<const RecordType *> CFPointees;
   llvm::DenseSet<const Type *> RecordlessTypes;
   bool IsARCEnabled{false};
+  bool DefaultSynthProperties{true};
 
 public:
   void visitTranslationUnitDecl(const TranslationUnitDecl *);
   void visitTypedef(const TypedefDecl *);
   bool isUnretained(const QualType, bool ignoreARC = false);
   bool isARCEnabled() const { return IsARCEnabled; }
+  bool defaultSynthProperties() const { return DefaultSynthProperties; }
 };
 
 /// \returns true if \p Class is NS or CF objects AND not retained, false if

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

@@ -38,7 +38,8 @@ class RawPtrRefMemberChecker
   RawPtrRefMemberChecker(const char *description)
       : Bug(this, description, "WebKit coding guidelines") {}
 
-  virtual std::optional<bool> isUnsafePtr(QualType) const = 0;
+  virtual std::optional<bool> isUnsafePtr(QualType,
+                                          bool ignoreARC = false) const = 0;
   virtual const char *typeName() const = 0;
   virtual const char *invariant() const = 0;
 
@@ -174,7 +175,15 @@ class RawPtrRefMemberChecker
     if (!PropType)
       return;
 
-    auto IsUnsafePtr = isUnsafePtr(QT);
+    if (const ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CD)) {
+      if (!RTC || !RTC->defaultSynthProperties() ||
+          ID->isObjCRequiresPropertyDefs())
+        return;
+    }
+
+    bool ignoreARC =
+        !PD->isReadOnly() && PD->getSetterKind() == ObjCPropertyDecl::Assign;
+    auto IsUnsafePtr = isUnsafePtr(QT, ignoreARC);
     if (!IsUnsafePtr || !*IsUnsafePtr)
       return;
 
@@ -274,7 +283,7 @@ class NoUncountedMemberChecker final : public RawPtrRefMemberChecker {
       : RawPtrRefMemberChecker("Member variable is a raw-pointer/reference to "
                                "reference-countable type") {}
 
-  std::optional<bool> isUnsafePtr(QualType QT) const final {
+  std::optional<bool> isUnsafePtr(QualType QT, bool) const final {
     return isUncountedPtr(QT.getCanonicalType());
   }
 
@@ -291,7 +300,7 @@ class NoUncheckedPtrMemberChecker final : public RawPtrRefMemberChecker {
       : RawPtrRefMemberChecker("Member variable is a raw-pointer/reference to "
                                "checked-pointer capable type") {}
 
-  std::optional<bool> isUnsafePtr(QualType QT) const final {
+  std::optional<bool> isUnsafePtr(QualType QT, bool) const final {
     return isUncheckedPtr(QT.getCanonicalType());
   }
 
@@ -311,8 +320,8 @@ class NoUnretainedMemberChecker final : public RawPtrRefMemberChecker {
     RTC = RetainTypeChecker();
   }
 
-  std::optional<bool> isUnsafePtr(QualType QT) const final {
-    return RTC->isUnretained(QT);
+  std::optional<bool> isUnsafePtr(QualType QT, bool ignoreARC) const final {
+    return RTC->isUnretained(QT, ignoreARC);
   }
 
   const char *typeName() const final { return "retainable type"; }

clang/test/Analysis/Checkers/WebKit/objc-mock-types.h

@@ -22,6 +22,7 @@ typedef struct CF_BRIDGED_TYPE(id) CGImage *CGImageRef;
 #define NS_RETURNS_RETAINED __attribute__((ns_returns_retained))
 #define CF_CONSUMED __attribute__((cf_consumed))
 #define CF_RETURNS_RETAINED __attribute__((cf_returns_retained))
+#define NS_REQUIRES_PROPERTY_DEFINITIONS __attribute__((objc_requires_property_definitions))
 
 extern const CFAllocatorRef kCFAllocatorDefault;
 typedef struct _NSZone NSZone;

clang/test/Analysis/Checkers/WebKit/unretained-members-arc.mm

@@ -64,3 +64,33 @@ void forceTmplToInstantiate(FooTmpl<SomeObj, CFMutableArrayRef>) {}
   };
 
 } // namespace ptr_to_ptr_to_retained
+
+@interface AnotherObject : NSObject {
+  NSString *ns_string;
+  CFStringRef cf_string;
+  // expected-warning@-1{{Instance variable 'cf_string' in 'AnotherObject' is a retainable type 'CFStringRef'; member variables must be a RetainPtr}}
+}
+@property(nonatomic, strong) NSString *prop_string1;
+@property(nonatomic, assign) NSString *prop_string2;
+// expected-warning@-1{{Property 'prop_string2' in 'AnotherObject' is a raw pointer to retainable type 'NSString'; member variables must be a RetainPtr}}
+@property(nonatomic, unsafe_unretained) NSString *prop_string3;
+// expected-warning@-1{{Property 'prop_string3' in 'AnotherObject' is a raw pointer to retainable type 'NSString'; member variables must be a RetainPtr}}
+@property(nonatomic, readonly) NSString *prop_string4;
+@end
+
+NS_REQUIRES_PROPERTY_DEFINITIONS
+@interface NoSynthObject : NSObject {
+  NSString *ns_string;
+  CFStringRef cf_string;
+  // expected-warning@-1{{Instance variable 'cf_string' in 'NoSynthObject' is a retainable type 'CFStringRef'; member variables must be a RetainPtr}}
+}
+@property(nonatomic, readonly, strong) NSString *prop_string1;
+@property(nonatomic, readonly, strong) NSString *prop_string2;
+@end
+
+@implementation NoSynthObject
+- (NSString *)prop_string1 {
+  return nil;
+}
+@synthesize prop_string2;
+@end

clang/test/Analysis/Checkers/WebKit/unretained-members.mm

@@ -99,3 +99,22 @@ @interface AnotherObject : NSObject {
 @property(nonatomic, strong) NSString *prop_string;
 // expected-warning@-1{{Property 'prop_string' in 'AnotherObject' is a raw pointer to retainable type 'NSString'; member variables must be a RetainPtr}}
 @end
+
+NS_REQUIRES_PROPERTY_DEFINITIONS
+@interface NoSynthObject : NSObject {
+  NSString *ns_string;
+  // expected-warning@-1{{Instance variable 'ns_string' in 'NoSynthObject' is a raw pointer to retainable type 'NSString'; member variables must be a RetainPtr}}
+  CFStringRef cf_string;
+  // expected-warning@-1{{Instance variable 'cf_string' in 'NoSynthObject' is a retainable type 'CFStringRef'; member variables must be a RetainPtr}}
+}
+@property(nonatomic, readonly, strong) NSString *prop_string1;
+@property(nonatomic, readonly, strong) NSString *prop_string2;
+@end
+
+@implementation NoSynthObject
+- (NSString *)prop_string1 {
+  return nil;
+}
+@synthesize prop_string2;
+// expected-warning@-1{{Instance variable 'prop_string2' in 'NoSynthObject' is a raw pointer to retainable type 'NSString'}}
+@end