[PATCH] D48427: [Analyzer] Iterator Checker Hotfix: Defer deletion of container data until its last iterator is cleaned up

[Balogh, Ádám via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rC338234: [Analyzer] Iterator Checker Hotfix: Defer deletion of container data until its… (authored by baloghadamsoftware, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D48427?vs=154066&id=157929#toc

Repository:
  rC Clang

https://reviews.llvm.org/D48427

Files:
  lib/StaticAnalyzer/Checkers/IteratorChecker.cpp


Index: lib/StaticAnalyzer/Checkers/IteratorChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/IteratorChecker.cpp
+++ lib/StaticAnalyzer/Checkers/IteratorChecker.cpp
@@ -291,6 +291,7 @@
                                       const MemRegion *Cont);
 ProgramStateRef setContainerData(ProgramStateRef State, const MemRegion *Cont,
                                  const ContainerData &CData);
+bool hasLiveIterators(ProgramStateRef State, const MemRegion *Cont);
 bool isOutOfRange(ProgramStateRef State, const IteratorPosition &Pos);
 bool isZero(ProgramStateRef State, const NonLoc &Val);
 } // namespace
@@ -536,7 +537,11 @@
   auto ContMap = State->get<ContainerMap>();
   for (const auto Cont : ContMap) {
     if (!SR.isLiveRegion(Cont.first)) {
-      State = State->remove<ContainerMap>(Cont.first);
+      // We must keep the container data while it has live iterators to be able
+      // to compare them to the begin and the end of the container.
+      if (!hasLiveIterators(State, Cont.first)) {
+        State = State->remove<ContainerMap>(Cont.first);
+      }
     }
   }
 
@@ -1188,6 +1193,22 @@
   return NewState;
 }
 
+bool hasLiveIterators(ProgramStateRef State, const MemRegion *Cont) {
+  auto RegionMap = State->get<IteratorRegionMap>();
+  for (const auto Reg : RegionMap) {
+    if (Reg.second.getContainer() == Cont)
+      return true;
+  }
+
+  auto SymbolMap = State->get<IteratorSymbolMap>();
+  for (const auto Sym : SymbolMap) {
+    if (Sym.second.getContainer() == Cont)
+      return true;
+  }
+
+  return false;
+}
+
 bool isZero(ProgramStateRef State, const NonLoc &Val) {
   auto &BVF = State->getBasicVals();
   return compare(State, Val,


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