================
@@ -832,6 +833,65 @@ class LoanPropagationAnalysis
}
};
+// ========================================================================= //
+// Expired Loans Analysis
+// ========================================================================= //
+
+/// The dataflow lattice for tracking the set of expired loans.
+struct ExpiredLattice {
+ LoanSet Expired;
+
+ ExpiredLattice() : Expired(nullptr) {};
+ explicit ExpiredLattice(LoanSet S) : Expired(S) {}
+
+ bool operator==(const ExpiredLattice &Other) const {
+ return Expired == Other.Expired;
+ }
+ bool operator!=(const ExpiredLattice &Other) const {
+ return !(*this == Other);
+ }
+
+ void dump(llvm::raw_ostream &OS) const {
+ OS << "ExpiredLattice State:\n";
+ if (Expired.isEmpty())
+ OS << " <empty>\n";
+ for (const LoanID &LID : Expired)
+ OS << " Loan " << LID << " is expired\n";
+ }
+};
+
+/// The analysis that tracks which loans have expired.
+class ExpiredLoansAnalysis
+ : public DataflowAnalysis<ExpiredLoansAnalysis, ExpiredLattice,
+ Direction::Forward> {
+
+ LoanSet::Factory &Factory;
+
+public:
+ ExpiredLoansAnalysis(const CFG &C, AnalysisDeclContext &AC, FactManager &F,
+ LifetimeFactory &Factory)
+ : DataflowAnalysis(C, AC, F), Factory(Factory.LoanSetFactory) {}
+
+ using Base::transfer;
+
+ StringRef getAnalysisName() const { return "ExpiredLoans"; }
+
+ Lattice getInitialState() { return Lattice(Factory.getEmptySet()); }
+
+ /// Merges two lattices by taking the union of the expired loan sets.
+ Lattice join(Lattice L1, Lattice L2) const {
+ return Lattice(utils::join(L1.Expired, L2.Expired, Factory));
+ }
+
+ Lattice transfer(Lattice In, const ExpireFact &F) {
+ return Lattice(Factory.add(In.Expired, F.getLoanID()));
+ }
+
+ Lattice transfer(Lattice In, const IssueFact &F) {
+ return Lattice(Factory.remove(In.Expired, F.getLoanID()));
----------------
usx95 wrote:
Done. There is a subtle false negative due to this as well. Mentioned that.
https://github.com/llvm/llvm-project/pull/148712
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