[clang] [analyzer] Support interestingness in ArrayBoundV2 (PR #78315)

[via cfe-commits]

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@@ -33,7 +33,66 @@ using namespace taint;
 using llvm::formatv;
 
 namespace {
-enum OOB_Kind { OOB_Precedes, OOB_Exceeds, OOB_Taint };
+class StateUpdateReporter {
+  const SubRegion *Reg;
+  NonLoc ByteOffsetVal;
+  std::optional<QualType> ElementType = std::nullopt;
+  std::optional<int64_t> ElementSize = std::nullopt;
+  bool AssumedNonNegative = false;
+  std::optional<NonLoc> AssumedUpperBound = std::nullopt;
+
+public:
+  StateUpdateReporter(const SubRegion *R, NonLoc ByteOffsVal, const Expr *E,
+                      CheckerContext &C)
+      : Reg(R), ByteOffsetVal(ByteOffsVal) {
+    initializeElementInfo(E, C);
+  }
+
+  void initializeElementInfo(const Expr *E, CheckerContext &C) {
+    if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
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NagyDonat wrote:

I agree that `ASE` is not a nice name, but `Subscript` would completely mislead me: I'd definitely assume that it just refers to the "subscript", i.e. the expression that's inside the square brackets.

https://github.com/llvm/llvm-project/pull/78315