From: George Karpenkov <ekarpenkov@apple.com>
Date: Tue, 3 Oct 2017 18:12:15 +0000 (+0000)
Subject: [Analyzer] More granular special casing in RetainCountChecker
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=be0345e47273a01065874e568ad673f89b75317a;p=clang

[Analyzer] More granular special casing in RetainCountChecker

Only assume that IOBSDNameMatching and friends increment a reference counter
if their return type is a CFMutableDictionaryRef.

Differential Revision: https://reviews.llvm.org/D38487

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@314820 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
index 165bc04993..7212d296a1 100644
--- a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
@@ -1062,6 +1062,7 @@ RetainSummaryManager::getFunctionSummary(const FunctionDecl *FD) {
 
     // Inspect the result type.
     QualType RetTy = FT->getReturnType();
+    StringRef RetTyName = RetTy.getAsString();
 
     // FIXME: This should all be refactored into a chain of "summary lookup"
     //  filters.
@@ -1081,12 +1082,14 @@ RetainSummaryManager::getFunctionSummary(const FunctionDecl *FD) {
       AllowAnnotations = false;
     } else if (FName == "CFPlugInInstanceCreate") {
       S = getPersistentSummary(RetEffect::MakeNoRet());
-    } else if (FName == "IOBSDNameMatching" ||
+    } else if (FName == "IORegistryEntrySearchCFProperty"
+        || (RetTyName == "CFMutableDictionaryRef" && (
+               FName == "IOBSDNameMatching" ||
                FName == "IOServiceMatching" ||
                FName == "IOServiceNameMatching" ||
-               FName == "IORegistryEntrySearchCFProperty" ||
                FName == "IORegistryEntryIDMatching" ||
-               FName == "IOOpenFirmwarePathMatching") {
+               FName == "IOOpenFirmwarePathMatching"
+            ))) {
       // Part of <rdar://problem/6961230>. (IOKit)
       // This should be addressed using a API table.
       S = getPersistentSummary(RetEffect::MakeOwned(RetEffect::CF),
diff --git a/test/Analysis/retain-release.mm b/test/Analysis/retain-release.mm
index c694fd33c5..ac83c1a48e 100644
--- a/test/Analysis/retain-release.mm
+++ b/test/Analysis/retain-release.mm
@@ -463,3 +463,10 @@ void	radar13722286::PrepareBitmap() {
 
 // rdar://34210609
 void _() { _(); }; // no-warning
+
+// Do not assume that IOBSDNameMatching increments a reference counter,
+// unless return type is CFMutableDictionaryRef.
+void* IOBSDNameMatching();
+void rdar33832412() {
+  void* x = IOBSDNameMatching(); // no-warning
+}