[mlir] fix Undefined behavior in CastInfo::castFailed with From=<MLIR…

… interface> Fixes #86647
llvm · Mar 29, 2024 · 3cd0fc9 · 3cd0fc9
1 parent e6f63a9
commit 3cd0fc9
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Showing 3 changed files with 58 additions and 1 deletion.
diff --git a/mlir/include/mlir/IR/OpDefinition.h b/mlir/include/mlir/IR/OpDefinition.h
@@ -22,6 +22,7 @@
 #include "mlir/IR/Dialect.h"
 #include "mlir/IR/ODSSupport.h"
 #include "mlir/IR/Operation.h"
+#include "llvm/Support/Casting.h"
 #include "llvm/Support/PointerLikeTypeTraits.h"
 
 #include <optional>
@@ -2110,6 +2111,33 @@ struct DenseMapInfo<T,
   }
   static bool isEqual(T lhs, T rhs) { return lhs == rhs; }
 };
+
+template <typename To, typename From>
+struct CastInfo<
+    To, From,
+    std::enable_if_t<
+        std::is_base_of_v<mlir::OpInterface<To, typename To::InterfaceTraits>,
+                          To> &&
+            std::is_base_of_v<mlir::OpInterface<std::remove_const_t<From>,
+                                                typename std::remove_const_t<
+                                                    From>::InterfaceTraits>,
+                              std::remove_const_t<From>>,
+        void>> : NullableValueCastFailed<To>,
+                 DefaultDoCastIfPossible<To, From, CastInfo<To, From>> {
+
+  static bool isPossible(From &val) {
+    if constexpr (std::is_same_v<To, From>)
+      return true;
+    else
+      return isa<To>(
+          const_cast<std::remove_const_t<From> &>(val).getOperation());
+  }
+
+  static To doCast(From &val) {
+    return To(const_cast<std::remove_const_t<From> &>(val).getOperation());
+  }
+};
+
 } // namespace llvm
 
 #endif
diff --git a/mlir/tools/mlir-tblgen/OpInterfacesGen.cpp b/mlir/tools/mlir-tblgen/OpInterfacesGen.cpp
@@ -544,7 +544,8 @@ void InterfaceGenerator::emitInterfaceDecl(const Interface &interface) {
   // Emit the main interface class declaration.
   os << llvm::formatv("class {0} : public ::mlir::{3}<{1}, detail::{2}> {\n"
                       "public:\n"
-                      "  using ::mlir::{3}<{1}, detail::{2}>::{3};\n",
+                      "  using ::mlir::{3}<{1}, detail::{2}>::{3};\n"
+                      "  using InterfaceTraits = detail::{2};\n",
                       interfaceName, interfaceName, interfaceTraitsName,
                       interfaceBaseType);
 

diff --git a/mlir/unittests/Interfaces/InferTypeOpInterfaceTest.cpp b/mlir/unittests/Interfaces/InferTypeOpInterfaceTest.cpp
@@ -17,6 +17,7 @@
 #include "mlir/IR/OpDefinition.h"
 #include "mlir/IR/OpImplementation.h"
 #include "mlir/Parser/Parser.h"
+#include "llvm/ADT/TypeSwitch.h"
 
 #include <gtest/gtest.h>
 
@@ -103,3 +104,30 @@ TEST_F(ValueShapeRangeTest, SettingShapes) {
   EXPECT_EQ(range.getShape(1).getDimSize(0), 1);
   EXPECT_FALSE(range.getShape(2));
 }
+
+TEST(OperationInterfaceTest, CastOpToInterface) {
+  DialectRegistry registry;
+  MLIRContext ctx;
+
+  const char *ir = R"MLIR(
+      func.func @map(%arg : tensor<1xi64>) {
+        %0 = arith.constant dense<[10]> : tensor<1xi64>
+        %1 = arith.addi %arg, %0 : tensor<1xi64>
+        return
+      }
+    )MLIR";
+
+  registry.insert<func::FuncDialect, arith::ArithDialect>();
+  ctx.appendDialectRegistry(registry);
+  OwningOpRef<ModuleOp> module = parseSourceString<ModuleOp>(ir, &ctx);
+  Operation &op = cast<func::FuncOp>(module->front()).getBody().front().front();
+
+  ::mlir::OpAsmOpInterface interface = llvm::cast<::mlir::OpAsmOpInterface>(op);
+
+  std::string funcName;
+  llvm::TypeSwitch<::mlir::OpAsmOpInterface, void>(interface)
+      .Case<::mlir::VectorUnrollOpInterface, arith::ConstantOp>(
+          [&](auto op) { funcName = __PRETTY_FUNCTION__; });
+
+  EXPECT_TRUE(funcName.find("ConstantOp") != std::string::npos);
+}