[clang] [llvm] [Clang][SME] Detect always_inline used with mismatched streaming attributes (PR #77936)

[Sander de Smalen via cfe-commits]

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@@ -814,6 +820,43 @@ Address AArch64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
                           /*allowHigherAlign*/ false);
 }
 
+static bool isStreaming(const FunctionDecl *F) {
+  if (F->hasAttr<ArmLocallyStreamingAttr>())
+    return true;
+  if (const auto *T = F->getType()->getAs<FunctionProtoType>())
+    return T->getAArch64SMEAttributes() & FunctionType::SME_PStateSMEnabledMask;
+  return false;
+}
+
+static bool isStreamingCompatible(const FunctionDecl *F) {
+  if (const auto *T = F->getType()->getAs<FunctionProtoType>())
+    return T->getAArch64SMEAttributes() &
+           FunctionType::SME_PStateSMCompatibleMask;
+  return false;
+}
+
+void AArch64TargetCodeGenInfo::checkFunctionCallABI(
+    CodeGenModule &CGM, SourceLocation CallLoc, const FunctionDecl *Caller,
+    const FunctionDecl *Callee, const CallArgList &Args) const {
+  if (!Caller || !Callee->hasAttr<AlwaysInlineAttr>())
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sdesmalen-arm wrote:

nit: is it worth adding `|| !Callee` here as well? (without knowing the context of how this function is called, I guess you could argue that `Callee` could also be `nullptr`)

https://github.com/llvm/llvm-project/pull/77936