Author: Stanislav Gatev Date: 2022-01-18T21:27:43Z New Revision: 68226e572f41105446413b12ee95ab5540b2b6ac
URL: https://github.com/llvm/llvm-project/commit/68226e572f41105446413b12ee95ab5540b2b6ac DIFF: https://github.com/llvm/llvm-project/commit/68226e572f41105446413b12ee95ab5540b2b6ac.diff LOG: [clang][dataflow] Add a test to justify skipping past references in UO_Deref This is part of the implementation of the dataflow analysis framework. See "[RFC] A dataflow analysis framework for Clang AST" on cfe-dev. Reviewed-by: xazax.hun Differential Revision: https://reviews.llvm.org/D117567 Added: Modified: clang/lib/Analysis/FlowSensitive/Transfer.cpp clang/unittests/Analysis/FlowSensitive/TransferTest.cpp Removed: ################################################################################ diff --git a/clang/lib/Analysis/FlowSensitive/Transfer.cpp b/clang/lib/Analysis/FlowSensitive/Transfer.cpp index 0979f55c5a5c8..865191916e502 100644 --- a/clang/lib/Analysis/FlowSensitive/Transfer.cpp +++ b/clang/lib/Analysis/FlowSensitive/Transfer.cpp @@ -182,6 +182,7 @@ class TransferVisitor : public ConstStmtVisitor<TransferVisitor> { switch (S->getOpcode()) { case UO_Deref: { + // Skip past a reference to handle dereference of a dependent pointer. const auto *SubExprVal = cast_or_null<PointerValue>( Env.getValue(*SubExpr, SkipPast::Reference)); if (SubExprVal == nullptr) diff --git a/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp b/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp index ea035ba013daf..d1d8705d26c0a 100644 --- a/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp +++ b/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp @@ -1758,4 +1758,34 @@ TEST_F(TransferTest, AddrOfReference) { }); } +TEST_F(TransferTest, DerefDependentPtr) { + std::string Code = R"( + template <typename T> + void target(T *Foo) { + T &Bar = *Foo; + /*[[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 *FooDecl = findValueDecl(ASTCtx, "Foo"); + ASSERT_THAT(FooDecl, NotNull()); + + const ValueDecl *BarDecl = findValueDecl(ASTCtx, "Bar"); + ASSERT_THAT(BarDecl, NotNull()); + + const auto *FooVal = + cast<PointerValue>(Env.getValue(*FooDecl, SkipPast::None)); + const auto *BarVal = + cast<ReferenceValue>(Env.getValue(*BarDecl, SkipPast::None)); + EXPECT_EQ(&BarVal->getPointeeLoc(), &FooVal->getPointeeLoc()); + }); +} + } // namespace _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
