[clang] [Clang][CodeGen] Enable pointer overflow check for GCC workaround (PR #137849)
Eli Friedman via cfe-commits
cfe-commits at lists.llvm.org
Wed May 7 12:24:59 PDT 2025
================
@@ -4169,10 +4169,10 @@ static Value *emitPointerArithmetic(CodeGenFunction &CGF,
// The index is not pointer-sized.
// The pointer type is not byte-sized.
//
- if (BinaryOperator::isNullPointerArithmeticExtension(CGF.getContext(),
- op.Opcode,
- expr->getLHS(),
- expr->getRHS()))
+ // Note that we do not suppress the pointer overflow check in this case.
+ if (!CGF.SanOpts.has(SanitizerKind::PointerOverflow) &&
+ BinaryOperator::isNullPointerArithmeticExtension(
+ CGF.getContext(), op.Opcode, expr->getLHS(), expr->getRHS()))
----------------
efriedma-quic wrote:
We can do the overflow check; we just need to make sure we do the inttoptr afterwards, instead of the gep of null.
https://github.com/llvm/llvm-project/pull/137849
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