[PATCH] D97183: [analyzer] Add NoteTag for smart-ptr get()

[Deep Majumder via Phabricator via cfe-commits]

RedDocMD updated this revision to Diff 331461.
RedDocMD added a comment.

Added a negative test


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D97183/new/

https://reviews.llvm.org/D97183

Files:
  clang/lib/StaticAnalyzer/Checkers/SmartPtrChecker.cpp
  clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
  clang/test/Analysis/smart-ptr-text-output.cpp


Index: clang/test/Analysis/smart-ptr-text-output.cpp
===================================================================
--- clang/test/Analysis/smart-ptr-text-output.cpp
+++ clang/test/Analysis/smart-ptr-text-output.cpp
@@ -321,3 +321,11 @@
     // expected-note at -1{{Dereference of null smart pointer 'P'}}
 }
 
+void getShouldNotLeaveNoteWhenPtrNotUsed(std::unique_ptr<A> P) {
+  A *a = P.get(); 
+  if (!P) { // expected-note {{Taking true branch}}
+    // expected-note at -1 {{Assuming smart pointer 'P' is null}}
+    P->foo(); // expected-warning {{Dereference of null smart pointer 'P' [alpha.cplusplus.SmartPtr]}}
+    // expected-note at -1{{Dereference of null smart pointer 'P'}}
+  }
+}
Index: clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
+++ clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
@@ -464,7 +464,7 @@
     if (&BR.getBugType() != smartptr::getNullDereferenceBugType() ||
         !BR.isInteresting(ThisRegion))
       return;
-    if (!State->assume(InnerPointerVal.castAs<DefinedSVal>(), true))
+    if (!BR.isInteresting(InnerPointerVal) || !BR.isInteresting(InnerPointerVal.getAsSymbol()))
       return;
     if (ThisRegion->canPrintPretty()) {
       OS << "Obtained null inner pointer from";
Index: clang/lib/StaticAnalyzer/Checkers/SmartPtrChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/SmartPtrChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/SmartPtrChecker.cpp
@@ -87,6 +87,8 @@
   auto R = std::make_unique<PathSensitiveBugReport>(NullDereferenceBugType,
                                                     OS.str(), ErrNode);
   R->markInteresting(DerefRegion);
+  const Expr *BugExpr = Call.getOriginExpr();
+  bugreporter::trackExpressionValue(ErrNode, BugExpr, *R);
   C.emitReport(std::move(R));
 }
 


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