[clang-tools-extra] [libc] [llvm] [libcxx] [clang] [compiler-rt] [flang] [Clang] Generate the GEP instead of adding AST nodes (PR #73730)

[Eli Friedman via cfe-commits]

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@@ -4022,8 +4169,36 @@ LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
       ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
     else
       ArrayLV = EmitLValue(Array);
+
     auto *Idx = EmitIdxAfterBase(/*Promote*/true);
 
+    if (SanOpts.has(SanitizerKind::ArrayBounds)) {
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efriedma-quic wrote:

Yes.  You should be able to refactor some code out of CodeGenFunction::EmitMemberExpr so it's not a completely independent codepath.

I mean, I see why you're concerned about re-implementing EmitMemberExpr, but fragility isn't just about simplifying the control flow within the compiler; the nastiest problems are caused by one piece of code making assumptions about how an apparently unrelated part of the code behaves.

https://github.com/llvm/llvm-project/pull/73730