[clang] [Clang][Sema] Add -Wstringop-overread warning for source buffer overreads (PR #183004)

[Erich Keane via cfe-commits]

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@@ -2927,6 +2927,11 @@ class Sema final : public SemaBase {
       CallExpr *TheCall, EltwiseBuiltinArgTyRestriction ArgTyRestr =
                              EltwiseBuiltinArgTyRestriction::None);
 
+  /// Check for source buffer overread in memory functions.
+  void checkSourceBufferOverread(FunctionDecl *FD, CallExpr *TheCall,
+                                 unsigned SrcArgIdx, unsigned SizeArgIdx,
+                                 StringRef FunctionName = "");
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erichkeane wrote:

Why do you need the function name if you have the decl?

https://github.com/llvm/llvm-project/pull/183004