[clang] [mutation analyzer] support mutation analysis for pointee (PR #118593)

[Julian Schmidt via cfe-commits]

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@@ -654,6 +716,83 @@ ExprMutationAnalyzer::Analyzer::findFunctionArgMutation(const Expr *Exp) {
   return nullptr;
 }
 
+const Stmt *
+ExprMutationAnalyzer::Analyzer::findPointeeValueMutation(const Expr *Exp) {
+  const auto Matches = match(
+      stmt(forEachDescendant(
+          expr(anyOf(
+                   // deref by *
+                   unaryOperator(hasOperatorName("*"),
+                                 hasUnaryOperand(canResolveToExprPointee(Exp))),
+                   // deref by []
+                   arraySubscriptExpr(hasBase(canResolveToExprPointee(Exp)))))
+              .bind(NodeID<Expr>::value))),
+      Stm, Context);
+  return findExprMutation(Matches);
+}
+
+const Stmt *
+ExprMutationAnalyzer::Analyzer::findPointeeMemberMutation(const Expr *Exp) {
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5chmidti wrote:

A `CXXOperatorCallExpr` could mutate as well, e.g., `(), +=`

https://github.com/llvm/llvm-project/pull/118593