[analyzer] Teach live variable analyzes that super uses self pointer.

llvm-svn: 161822

2 files changed, 41 insertions, 0 deletions

diff --git a/clang/lib/Analysis/LiveVariables.cpp b/clang/lib/Analysis/LiveVariables.cpp
index 584d81284e9..38f8199bffc 100644
--- a/clang/lib/Analysis/LiveVariables.cpp
+++ b/clang/lib/Analysis/LiveVariables.cpp
@@ -284,6 +284,14 @@ void TransferFunctions::Visit(Stmt *S) {
       }
       break;
     }
+    case Stmt::ObjCMessageExprClass: {
+      // In calls to super, include the implicit "self" pointer as being live.
+      ObjCMessageExpr *CE = cast<ObjCMessageExpr>(S);
+      if (CE->getReceiverKind() == ObjCMessageExpr::SuperInstance)
+        val.liveDecls = LV.DSetFact.add(val.liveDecls,
+                                        LV.analysisContext.getSelfDecl());
+      break;
+    }
     case Stmt::DeclStmtClass: {
       const DeclStmt *DS = cast<DeclStmt>(S);
       if (const VarDecl *VD = dyn_cast<VarDecl>(DS->getSingleDecl())) {
diff --git a/clang/test/Analysis/inlining/RetainCountExamples.m b/clang/test/Analysis/inlining/RetainCountExamples.m
new file mode 100644
index 00000000000..2b682c2b4bf
--- /dev/null
+++ b/clang/test/Analysis/inlining/RetainCountExamples.m
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -analyze -analyzer-checker=core,osx.cocoa.RetainCount -analyzer-ipa=dynamic-bifurcate -verify %s
+
+typedef signed char BOOL;
+typedef struct objc_class *Class;
+typedef struct objc_object {
+    Class isa;
+} *id;
+@protocol NSObject  - (BOOL)isEqual:(id)object; @end
+@interface NSObject <NSObject> {}
++(id)alloc;
++(id)new;
+- (oneway void)release;
+-(id)init;
+-(id)autorelease;
+-(id)copy;
+- (Class)class;
+-(id)retain;
+@end
+
+@interface SelfStaysLive : NSObject
+- (id)init;
+@end
+
+@implementation SelfStaysLive
+- (id)init {
+  return [super init];
+}
+@end
+
+void selfStaysLive() {
+    SelfStaysLive *foo = [[SelfStaysLive alloc] init]; 
+    [foo release];
+}
\ No newline at end of file