[clang] [AArch64][SME] Warn when using a streaming builtin from a non-streaming function (PR #74064)

[Sam Tebbs via cfe-commits]

================
@@ -3183,6 +3140,114 @@ bool Sema::CheckSVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
   return HasError;
 }
 
+static ArmStreamingType getArmStreamingFnType(const FunctionDecl *FD) {
+  if (FD->hasAttr<ArmLocallyStreamingAttr>())
+    return ArmStreaming;
+  if (const auto *T = FD->getType()->getAs<FunctionProtoType>()) {
+    if (T->getAArch64SMEAttributes() & FunctionType::SME_PStateSMEnabledMask)
+      return ArmStreaming;
+    if (T->getAArch64SMEAttributes() & FunctionType::SME_PStateSMCompatibleMask)
+      return ArmStreamingCompatible;
+  }
+  return ArmNonStreaming;
+}
+
+static void checkArmStreamingBuiltin(Sema &S, CallExpr *TheCall,
+                                     const FunctionDecl *FD,
+                                     ArmStreamingType BuiltinType) {
+  ArmStreamingType FnType = getArmStreamingFnType(FD);
+
+  if (FnType == ArmStreaming && BuiltinType == ArmNonStreaming) {
+    S.Diag(TheCall->getBeginLoc(), diag::warn_attribute_arm_sm_incompat_builtin)
+        << TheCall->getSourceRange() << "streaming";
+  }
+
+  if (FnType == ArmStreamingCompatible &&
+      BuiltinType != ArmStreamingCompatible) {
+    S.Diag(TheCall->getBeginLoc(), diag::warn_attribute_arm_sm_incompat_builtin)
+        << TheCall->getSourceRange() << "streaming compatible";
+    return;
+  }
+
+  if (FnType == ArmNonStreaming && BuiltinType == ArmStreaming) {
+    S.Diag(TheCall->getBeginLoc(), diag::warn_attribute_arm_sm_incompat_builtin)
+        << TheCall->getSourceRange() << "non-streaming";
+  }
+}
+
+static bool hasSMEZAState(const FunctionDecl *FD) {
+  if (FD->hasAttr<ArmNewZAAttr>())
+    return true;
+  if (const auto *T = FD->getType()->getAs<FunctionProtoType>())
+    if (T->getAArch64SMEAttributes() & FunctionType::SME_PStateZASharedMask)
+      return true;
+  return false;
+}
+
+static bool hasSMEZAState(unsigned BuiltinID) {
+  switch (BuiltinID) {
+  default:
+    return false;
+#define GET_SME_BUILTIN_HAS_ZA_STATE
+#include "clang/Basic/arm_sme_builtins_za_state.inc"
+#undef GET_SME_BUILTIN_HAS_ZA_STATE
+  }
+}
+
+bool Sema::CheckSMEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
+  if (const FunctionDecl *FD = getCurFunctionDecl()) {
+    std::optional<ArmStreamingType> BuiltinType;
+
+    switch (BuiltinID) {
+    default:
+      break;
+#define GET_SME_STREAMING_ATTRS
+#include "clang/Basic/arm_sme_streaming_attrs.inc"
+#undef GET_SME_STREAMING_ATTRS
+    }
+
+    if (BuiltinType)
+      checkArmStreamingBuiltin(*this, TheCall, FD, *BuiltinType);
+
+    if (hasSMEZAState(BuiltinID) && !hasSMEZAState(FD))
+      Diag(TheCall->getBeginLoc(),
+           diag::warn_attribute_arm_za_builtin_no_za_state)
+          << TheCall->getSourceRange();
+  }
+
+  // Range check SME intrinsics that take immediate values.
+  SmallVector<std::tuple<int, int, int>, 3> ImmChecks;
+
+  switch (BuiltinID) {
+  default:
+    return false;
+#define GET_SME_IMMEDIATE_CHECK
+#include "clang/Basic/arm_sme_sema_rangechecks.inc"
+#undef GET_SME_IMMEDIATE_CHECK
+  }
+
+  return ParseSVEImmChecks(TheCall, ImmChecks);
+}
+
+bool Sema::CheckSVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
----------------
SamTebbs33 wrote:

Done! Rebased and should be ready for review again now.

https://github.com/llvm/llvm-project/pull/74064