[clang][dataflow] Add a test that we can access fields of anonymous r…

…ecords.

Reviewed By: sammccall, ymandel, gribozavr2, xazax.hun

Differential Revision: https://reviews.llvm.org/D153409

clang/unittests/Analysis/FlowSensitive/TestingSupport.cpp

@@ -154,9 +154,19 @@ test::buildStatementToAnnotationMapping(const FunctionDecl *Func,
 }
 
 const ValueDecl *test::findValueDecl(ASTContext &ASTCtx, llvm::StringRef Name) {
-  auto TargetNodes = match(valueDecl(hasName(Name)).bind("v"), ASTCtx);
+  auto TargetNodes = match(
+      valueDecl(unless(indirectFieldDecl()), hasName(Name)).bind("v"), ASTCtx);
   assert(TargetNodes.size() == 1 && "Name must be unique");
   auto *const Result = selectFirst<ValueDecl>("v", TargetNodes);
   assert(Result != nullptr);
   return Result;
 }
+
+const IndirectFieldDecl *test::findIndirectFieldDecl(ASTContext &ASTCtx,
+                                                     llvm::StringRef Name) {
+  auto TargetNodes = match(indirectFieldDecl(hasName(Name)).bind("i"), ASTCtx);
+  assert(TargetNodes.size() == 1 && "Name must be unique");
+  const auto *Result = selectFirst<IndirectFieldDecl>("i", TargetNodes);
+  assert(Result != nullptr);
+  return Result;
+}

clang/unittests/Analysis/FlowSensitive/TestingSupport.h

@@ -428,6 +428,14 @@ runDataflowReturnError(llvm::StringRef Code, VerifyResultsT VerifyResults,
 ///   `Name` must be unique in `ASTCtx`.
 const ValueDecl *findValueDecl(ASTContext &ASTCtx, llvm::StringRef Name);
 
+/// Returns the `IndirectFieldDecl` for the given identifier.
+///
+/// Requirements:
+///
+///   `Name` must be unique in `ASTCtx`.
+const IndirectFieldDecl *findIndirectFieldDecl(ASTContext &ASTCtx,
+                                               llvm::StringRef Name);
+
 /// Returns the storage location (of type `LocT`) for the given identifier.
 /// `LocT` must be a subclass of `StorageLocation` and must be of the
 /// appropriate type.

clang/unittests/Analysis/FlowSensitive/TransferTest.cpp

@@ -5434,4 +5434,38 @@ TEST(TransferTest, BuiltinFunctionModeled) {
       });
 }
 
+// Check that fields of anonymous records are modeled.
+TEST(TransferTest, AnonymousStruct) {
+  std::string Code = R"(
+    struct S {
+      struct {
+        bool b;
+      };
+    };
+    void target() {
+      S s;
+      s.b = true;
+      // [[p]]
+    }
+  )";
+  runDataflow(
+      Code,
+      [](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
+         ASTContext &ASTCtx) {
+        const Environment &Env = getEnvironmentAtAnnotation(Results, "p");
+        const ValueDecl *SDecl = findValueDecl(ASTCtx, "s");
+        const ValueDecl *BDecl = findValueDecl(ASTCtx, "b");
+        const IndirectFieldDecl *IndirectField =
+            findIndirectFieldDecl(ASTCtx, "b");
+
+        auto *S =
+            cast<AggregateStorageLocation>(Env.getStorageLocation(*SDecl));
+        auto &AnonStruct = cast<AggregateStorageLocation>(
+            S->getChild(*cast<ValueDecl>(IndirectField->chain().front())));
+
+        auto *B = cast<BoolValue>(Env.getValue(AnonStruct.getChild(*BDecl)));
+        ASSERT_TRUE(Env.flowConditionImplies(*B));
+      });
+}
+
 } // namespace