[PATCH] D103081: RetainCountChecker: Disable reference counting for OSMetaClass.

[Georgeta Igna via Phabricator via cfe-commits]

georgi_igna created this revision.
georgi_igna requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103081

Files:
  clang/lib/Analysis/RetainSummaryManager.cpp
  clang/test/Analysis/os_object_base.h
  clang/test/Analysis/osobject-retain-release.cpp


Index: clang/test/Analysis/osobject-retain-release.cpp
===================================================================
--- clang/test/Analysis/osobject-retain-release.cpp
+++ clang/test/Analysis/osobject-retain-release.cpp
@@ -720,6 +720,16 @@
   obj->release();
 }
 
+void test_osmetaclass_release(){
+    const char *name = "no_name";
+    const OSMetaClass *meta = OSMetaClass::copyMetaClassWithName(name);
+    if (!meta) {
+        return;
+    } else {
+        meta->releaseMetaClass();
+    }
+}
+
 OSObject *getRuleViolation() {
   return new OSObject; // expected-warning{{Potential leak of an object of type 'OSObject'}}
 // expected-note at -1{{Operator 'new' returns an OSObject of type 'OSObject' with a +1 retain count}}
Index: clang/test/Analysis/os_object_base.h
===================================================================
--- clang/test/Analysis/os_object_base.h
+++ clang/test/Analysis/os_object_base.h
@@ -67,6 +67,8 @@
 struct OSMetaClass : public OSMetaClassBase {
   virtual OSObject * alloc() const;
   static OSObject * allocClassWithName(const char * name);
+  static const OSMetaClass * copyMetaClassWithName(const char * name);
+  void releaseMetaClass() const;
   virtual ~OSMetaClass(){}
 };
 
Index: clang/lib/Analysis/RetainSummaryManager.cpp
===================================================================
--- clang/lib/Analysis/RetainSummaryManager.cpp
+++ clang/lib/Analysis/RetainSummaryManager.cpp
@@ -145,14 +145,20 @@
   return !(match(SubclassM, *D, D->getASTContext()).empty());
 }
 
-static bool isOSObjectSubclass(const Decl *D) {
-  return D && isSubclass(D, "OSMetaClassBase");
+static bool isExactClass(const Decl *D, StringRef ClassName) {
+  using namespace ast_matchers;
+  DeclarationMatcher sameClassM =
+      cxxRecordDecl(hasName(std::string(ClassName)));
+  return !(match(sameClassM, *D, D->getASTContext()).empty());
 }
 
-static bool isOSObjectDynamicCast(StringRef S) {
-  return S == "safeMetaCast";
+static bool isOSObjectSubclass(const Decl *D) {
+  return D && isSubclass(D, "OSMetaClassBase") &&
+         !isExactClass(D, "OSMetaClass");
 }
 
+static bool isOSObjectDynamicCast(StringRef S) { return S == "safeMetaCast"; }
+
 static bool isOSObjectRequiredCast(StringRef S) {
   return S == "requiredMetaCast";
 }


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