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3 files changed, 0 insertions, 40 deletions
diff --git a/clang/include/clang/Analysis/FlowSensitive/DataflowAnalysisContext.h b/clang/include/clang/Analysis/FlowSensitive/DataflowAnalysisContext.h index c46109a..a792c3f 100644 --- a/clang/include/clang/Analysis/FlowSensitive/DataflowAnalysisContext.h +++ b/clang/include/clang/Analysis/FlowSensitive/DataflowAnalysisContext.h @@ -133,10 +133,6 @@ public: /// identified by `Token` imply that `Val` is true. bool flowConditionImplies(Atom Token, const Formula &); - /// Returns true if and only if the constraints of the flow condition - /// identified by `Token` are always true. - bool flowConditionIsTautology(Atom Token); - /// Returns true if `Val1` is equivalent to `Val2`. /// Note: This function doesn't take into account constraints on `Val1` and /// `Val2` imposed by the flow condition. diff --git a/clang/lib/Analysis/FlowSensitive/DataflowAnalysisContext.cpp b/clang/lib/Analysis/FlowSensitive/DataflowAnalysisContext.cpp index 9f6984e..6a1feb2 100644 --- a/clang/lib/Analysis/FlowSensitive/DataflowAnalysisContext.cpp +++ b/clang/lib/Analysis/FlowSensitive/DataflowAnalysisContext.cpp @@ -158,15 +158,6 @@ bool DataflowAnalysisContext::flowConditionImplies(Atom Token, return isUnsatisfiable(std::move(Constraints)); } -bool DataflowAnalysisContext::flowConditionIsTautology(Atom Token) { - // Returns true if and only if we cannot prove that the flow condition can - // ever be false. - llvm::SetVector<const Formula *> Constraints; - Constraints.insert(&arena().makeNot(arena().makeAtomRef(Token))); - addTransitiveFlowConditionConstraints(Token, Constraints); - return isUnsatisfiable(std::move(Constraints)); -} - bool DataflowAnalysisContext::equivalentFormulas(const Formula &Val1, const Formula &Val2) { llvm::SetVector<const Formula *> Constraints; diff --git a/clang/unittests/Analysis/FlowSensitive/DataflowAnalysisContextTest.cpp b/clang/unittests/Analysis/FlowSensitive/DataflowAnalysisContextTest.cpp index fb7642c..88eb110 100644 --- a/clang/unittests/Analysis/FlowSensitive/DataflowAnalysisContextTest.cpp +++ b/clang/unittests/Analysis/FlowSensitive/DataflowAnalysisContextTest.cpp @@ -99,33 +99,6 @@ TEST_F(DataflowAnalysisContextTest, JoinFlowConditions) { EXPECT_TRUE(Context.flowConditionImplies(FC3, C3)); } -TEST_F(DataflowAnalysisContextTest, FlowConditionTautologies) { - // Fresh flow condition with empty/no constraints is always true. - Atom FC1 = A.makeFlowConditionToken(); - EXPECT_TRUE(Context.flowConditionIsTautology(FC1)); - - // Literal `true` is always true. - Atom FC2 = A.makeFlowConditionToken(); - Context.addFlowConditionConstraint(FC2, A.makeLiteral(true)); - EXPECT_TRUE(Context.flowConditionIsTautology(FC2)); - - // Literal `false` is never true. - Atom FC3 = A.makeFlowConditionToken(); - Context.addFlowConditionConstraint(FC3, A.makeLiteral(false)); - EXPECT_FALSE(Context.flowConditionIsTautology(FC3)); - - // We can't prove that an arbitrary bool A is always true... - auto &C1 = A.makeAtomRef(A.makeAtom()); - Atom FC4 = A.makeFlowConditionToken(); - Context.addFlowConditionConstraint(FC4, C1); - EXPECT_FALSE(Context.flowConditionIsTautology(FC4)); - - // ... but we can prove A || !A is true. - Atom FC5 = A.makeFlowConditionToken(); - Context.addFlowConditionConstraint(FC5, A.makeOr(C1, A.makeNot(C1))); - EXPECT_TRUE(Context.flowConditionIsTautology(FC5)); -} - TEST_F(DataflowAnalysisContextTest, EquivBoolVals) { auto &X = A.makeAtomRef(A.makeAtom()); auto &Y = A.makeAtomRef(A.makeAtom()); |