[clang] [clang][analyzer] Model more getline/getdelim pre and postconditions (PR #83027)

[Balazs Benics via cfe-commits]

Alejandro =?utf-8?q?Álvarez_Ayllón?Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/83027 at github.com>


================
@@ -1158,6 +1173,123 @@ void StreamChecker::evalUngetc(const FnDescription *Desc, const CallEvent &Call,
   C.addTransition(StateFailed);
 }
 
+ProgramStateRef
+StreamChecker::ensurePtrNotNull(SVal PtrVal, const Expr *PtrExpr,
+                                CheckerContext &C, ProgramStateRef State,
+                                const StringRef PtrDescr) const {
+  const auto Ptr = PtrVal.getAs<DefinedSVal>();
+  if (!Ptr)
+    return nullptr;
+
+  assert(PtrExpr && "Expected an argument");
+
+  const auto [PtrNotNull, PtrNull] = State->assume(*Ptr);
+  if (!PtrNotNull && PtrNull) {
+    if (ExplodedNode *N = C.generateErrorNode(PtrNull)) {
+      SmallString<256> buf;
+      llvm::raw_svector_ostream os(buf);
+      os << PtrDescr << " pointer might be NULL.";
+
+      auto R = std::make_unique<PathSensitiveBugReport>(BT_SizeNull, buf, N);
----------------
steakhal wrote:

```suggestion
      auto R = std::make_unique<PathSensitiveBugReport>(BT_SizeNull, (PtrDescr + " pointer might be NULL.").str(), N);
```

https://github.com/llvm/llvm-project/pull/83027