[PATCH] D125547: [analyzer][solver] Handle UnarySymExpr in SMTConv

[Gabor Marton via Phabricator via cfe-commits]

martong updated this revision to Diff 429633.
martong marked 2 inline comments as done.
martong added a comment.

- Use existing fromUnOp
- pass nullptr as FromTy


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125547/new/

https://reviews.llvm.org/D125547

Files:
  clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConv.h
  clang/test/Analysis/z3-crosscheck.c


Index: clang/test/Analysis/z3-crosscheck.c
===================================================================
--- clang/test/Analysis/z3-crosscheck.c
+++ clang/test/Analysis/z3-crosscheck.c
@@ -14,6 +14,20 @@
   return 0;
 }
 
+int unary(int x, long l)
+{
+  int *z = 0;
+  int y = l;
+  if ((x & 1) && ((x & 1) ^ 1))
+    if (-y)
+#ifdef NO_CROSSCHECK
+        return *z; // expected-warning {{Dereference of null pointer (loaded from variable 'z')}}
+#else
+        return *z; // no-warning
+#endif
+  return 0;
+}
+
 void g(int d);
 
 void f(int *a, int *b) {
Index: clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConv.h
===================================================================
--- clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConv.h
+++ clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConv.h
@@ -446,6 +446,14 @@
       return getCastExpr(Solver, Ctx, Exp, FromTy, Sym->getType());
     }
 
+    if (const UnarySymExpr *USE = dyn_cast<UnarySymExpr>(Sym)) {
+      if (RetTy)
+        *RetTy = Sym->getType();
+      llvm::SMTExprRef Exp =
+          getSymExpr(Solver, Ctx, USE->getOperand(), nullptr, hasComparison);
+      return fromUnOp(Solver, USE->getOpcode(), Exp);
+    }
+
     if (const BinarySymExpr *BSE = dyn_cast<BinarySymExpr>(Sym)) {
       llvm::SMTExprRef Exp =
           getSymBinExpr(Solver, Ctx, BSE, hasComparison, RetTy);


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