2 files changed, 47 insertions, 0 deletions
diff --git a/clang/lib/CIR/Dialect/IR/CIRAttrs.cpp b/clang/lib/CIR/Dialect/IR/CIRAttrs.cpp
index 3484c59..64ac970 100644
--- a/clang/lib/CIR/Dialect/IR/CIRAttrs.cpp
+++ b/clang/lib/CIR/Dialect/IR/CIRAttrs.cpp
@@ -473,6 +473,49 @@ LogicalResult cir::VTableAttr::verify(
 }
 
 //===----------------------------------------------------------------------===//
+// DynamicCastInfoAtttr definitions
+//===----------------------------------------------------------------------===//
+
+std::string DynamicCastInfoAttr::getAlias() const {
+  // The alias looks like: `dyn_cast_info_<src>_<dest>`
+
+  std::string alias = "dyn_cast_info_";
+
+  alias.append(getSrcRtti().getSymbol().getValue());
+  alias.push_back('_');
+  alias.append(getDestRtti().getSymbol().getValue());
+
+  return alias;
+}
+
+LogicalResult DynamicCastInfoAttr::verify(
+    function_ref<InFlightDiagnostic()> emitError, cir::GlobalViewAttr srcRtti,
+    cir::GlobalViewAttr destRtti, mlir::FlatSymbolRefAttr runtimeFunc,
+    mlir::FlatSymbolRefAttr badCastFunc, cir::IntAttr offsetHint) {
+  auto isRttiPtr = [](mlir::Type ty) {
+    // RTTI pointers are !cir.ptr<!u8i>.
+
+    auto ptrTy = mlir::dyn_cast<cir::PointerType>(ty);
+    if (!ptrTy)
+      return false;
+
+    auto pointeeIntTy = mlir::dyn_cast<cir::IntType>(ptrTy.getPointee());
+    if (!pointeeIntTy)
+      return false;
+
+    return pointeeIntTy.isUnsigned() && pointeeIntTy.getWidth() == 8;
+  };
+
+  if (!isRttiPtr(srcRtti.getType()))
+    return emitError() << "srcRtti must be an RTTI pointer";
+
+  if (!isRttiPtr(destRtti.getType()))
+    return emitError() << "destRtti must be an RTTI pointer";
+
+  return success();
+}
+
+//===----------------------------------------------------------------------===//
 // CIR Dialect
 //===----------------------------------------------------------------------===//
 
diff --git a/clang/lib/CIR/Dialect/IR/CIRDialect.cpp b/clang/lib/CIR/Dialect/IR/CIRDialect.cpp
index cdd4e3c..5f88590 100644
--- a/clang/lib/CIR/Dialect/IR/CIRDialect.cpp
+++ b/clang/lib/CIR/Dialect/IR/CIRDialect.cpp
@@ -71,6 +71,10 @@ struct CIROpAsmDialectInterface : public OpAsmDialectInterface {
       os << "bfi_" << bitfield.getName().str();
       return AliasResult::FinalAlias;
     }
+    if (auto dynCastInfoAttr = mlir::dyn_cast<cir::DynamicCastInfoAttr>(attr)) {
+      os << dynCastInfoAttr.getAlias();
+      return AliasResult::FinalAlias;
+    }
     return AliasResult::NoAlias;
   }
 };