================
@@ -797,6 +798,21 @@ bool AArch64Arm64ECCallLowering::runOnModule(Module &Mod) {
// Check if this module has the cfguard flag and read its value.
CFGuardModuleFlag = M->getControlFlowGuardMode();
+ // Warn if the module flag requests an unsupported CFGuard mechanism.
+ if (CFGuardModuleFlag == ControlFlowGuardMode::Enabled) {
+ if (auto *CI = mdconst::dyn_extract_or_null<ConstantInt>(
+ Mod.getModuleFlag("cfguard-mechanism"))) {
----------------
dpaoliello wrote:
I think this deserves a post in the discourse: personally, I'd be worried about
bloating LangRef (which is already massive with all the intrinsics) with the
module flags. Maybe we should consider putting the module flags in a separate
doc that LagRef links to and, while doing that, split out the intrinsics as
well.
https://github.com/llvm/llvm-project/pull/176276
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