[PATCH] D128013: [clang][dataflow] Add support for comma binary operator

[Stanislav Gatev via Phabricator via cfe-commits]

sgatev created this revision.
sgatev added reviewers: ymandel, xazax.hun, gribozavr2.
Herald added subscribers: martong, tschuett, rnkovacs.
Herald added a project: All.
sgatev requested review of this revision.
Herald added a project: clang.

Add support for comma binary operator.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128013

Files:
  clang/lib/Analysis/FlowSensitive/Transfer.cpp
  clang/unittests/Analysis/FlowSensitive/TransferTest.cpp


Index: clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
===================================================================
--- clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
+++ clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
@@ -3557,4 +3557,35 @@
       });
 }
 
+TEST_F(TransferTest, BinaryOperatorComma) {
+  std::string Code = R"(
+    void target(int Foo, int Bar) {
+      int &Baz = (Foo, Bar);
+      // [[p]]
+    }
+  )";
+  runDataflow(Code,
+              [](llvm::ArrayRef<
+                     std::pair<std::string, DataflowAnalysisState<NoopLattice>>>
+                     Results,
+                 ASTContext &ASTCtx) {
+                ASSERT_THAT(Results, ElementsAre(Pair("p", _)));
+                const Environment &Env = Results[0].second.Env;
+
+                const ValueDecl *BarDecl = findValueDecl(ASTCtx, "Bar");
+                ASSERT_THAT(BarDecl, NotNull());
+
+                const ValueDecl *BazDecl = findValueDecl(ASTCtx, "Baz");
+                ASSERT_THAT(BazDecl, NotNull());
+
+                const StorageLocation *BarLoc =
+                    Env.getStorageLocation(*BarDecl, SkipPast::Reference);
+                ASSERT_THAT(BarLoc, NotNull());
+
+                const StorageLocation *BazLoc =
+                    Env.getStorageLocation(*BazDecl, SkipPast::Reference);
+                EXPECT_EQ(BazLoc, BarLoc);
+              });
+}
+
 } // namespace
Index: clang/lib/Analysis/FlowSensitive/Transfer.cpp
===================================================================
--- clang/lib/Analysis/FlowSensitive/Transfer.cpp
+++ clang/lib/Analysis/FlowSensitive/Transfer.cpp
@@ -95,6 +95,11 @@
                                                 : Env.makeNot(LHSEqRHSValue));
       break;
     }
+    case BO_Comma: {
+      if (auto *Loc = Env.getStorageLocation(*RHS, SkipPast::None))
+        Env.setStorageLocation(*S, *Loc);
+      break;
+    }
     default:
       break;
     }


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