[PATCH] D158848: [clang][dataflow] Support range-for loops in fixpoint algorithm.

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

ymandel created this revision.
ymandel added reviewers: mboehme, xazax.hun.
Herald added a subscriber: martong.
Herald added a reviewer: NoQ.
Herald added a project: All.
ymandel requested review of this revision.
Herald added a project: clang.

Adds support for recognizing range-for loops in the main algorithm for computing
the model fixpoint.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158848

Files:
  clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
  clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp


Index: clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp
===================================================================
--- clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp
+++ clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp
@@ -1612,4 +1612,24 @@
 
       });
 }
+
+TEST_F(TopTest, ForRangeStmtConverges) {
+  std::string Code = R"(
+    void target(bool Foo) {
+      int Ints[10];
+      bool B = false;
+      for (int I : Ints)
+        B = true;
+      (void)0;
+      // [[after_loop]]
+    }
+  )";
+  runDataflow(
+      Code,
+      [](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
+         const AnalysisOutputs &) {
+        EXPECT_THAT(Results.keys(),
+                    UnorderedElementsAre("loop_body", "after_loop"));
+      });
+}
 } // namespace
Index: clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
===================================================================
--- clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
+++ clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp
@@ -58,6 +58,7 @@
       case Stmt::WhileStmtClass:
       case Stmt::DoStmtClass:
       case Stmt::ForStmtClass:
+      case Stmt::CXXForRangeStmtClass:
         return true;
       default:
         return false;
@@ -108,6 +109,9 @@
     return {nullptr, false};
   }
 
+  // Don't do anything special for CXXForRangeStmt, because the condition (being
+  // implicitly generated) isn't visible from the loop body.
+
   TerminatorVisitorRetTy VisitBinaryOperator(const BinaryOperator *S) {
     assert(S->getOpcode() == BO_LAnd || S->getOpcode() == BO_LOr);
     auto *LHS = S->getLHS();


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