Add test

Author: jpienaar

mlir/test/IR/test-verifiers-attr.mlir

@@ -0,0 +1,16 @@
+// RUN: mlir-opt %s -split-input-file -verify-diagnostics
+
+// Test basic symbol verification using discardable attribute.
+module {
+  func.func @existing_symbol() { return }
+  
+  func.func @test() attributes {symbol_ref = #test.symbol_ref_attr<@existing_symbol>} { return }
+}
+
+// -----
+
+// Test invalid symbol reference, symbol does not exist.
+module {
+  // expected-error@+1 {{TestSymbolRefAttr::verifySymbolUses: '@non_existent_symbol' does not reference a valid symbol}}
+  func.func @test() attributes {symbol_ref = #test.symbol_ref_attr<@non_existent_symbol>} { return }
+}

mlir/test/lib/Dialect/Test/TestAttrDefs.td

@@ -22,6 +22,7 @@ include "mlir/IR/AttrTypeBase.td"
 include "mlir/IR/BuiltinAttributeInterfaces.td"
 include "mlir/IR/EnumAttr.td"
 include "mlir/IR/OpAsmInterface.td"
+include "mlir/IR/SymbolInterfaces.td"
 include "mlir/IR/TensorEncoding.td"
 
 // All of the attributes will extend this class.
@@ -456,4 +457,17 @@ def TestMemRefLayoutAttr : Test_Attr<"TestMemRefLayout",
   let assemblyFormat = "`<` $dummy `>`";
 }
 
+// Test attribute that implements SymbolUserAttrInterface.
+def TestSymbolRefAttr : Test_Attr<"TestSymbolRef",
+    [DeclareAttrInterfaceMethods<SymbolUserAttrInterface>]> {
+  let mnemonic = "symbol_ref_attr";
+  let summary = "Test attribute that references a symbol";
+  let description = [{
+    This attribute holds a reference to a symbol and implements
+    SymbolUserAttrInterface to verify that the referenced symbol exists.
+  }];
+  let parameters = (ins "::mlir::FlatSymbolRefAttr":$symbol);
+  let assemblyFormat = "`<` $symbol `>`";
+}
+
 #endif // TEST_ATTRDEFS

mlir/test/lib/Dialect/Test/TestAttributes.cpp

@@ -223,6 +223,25 @@ LogicalResult TestCopyCountAttr::verify(
   return success();
 }
 
+//===----------------------------------------------------------------------===//
+// TestSymbolRefAttr
+//===----------------------------------------------------------------------===//
+
+LogicalResult
+TestSymbolRefAttr::verifySymbolUses(Operation *op,
+                                    SymbolTableCollection &symbolTable) const {
+  // Verify that the referenced symbol exists
+  if (!symbolTable.lookupNearestSymbolFrom<SymbolOpInterface>(op, getSymbol()))
+    return op->emitOpError()
+           << "TestSymbolRefAttr::verifySymbolUses: '" << getSymbol()
+           << "' does not reference a valid symbol";
+  return success();
+}
+
+//===----------------------------------------------------------------------===//
+// Generated Attribute Definitions
+//===----------------------------------------------------------------------===//
+
 //===----------------------------------------------------------------------===//
 // CopyCountAttr Implementation
 //===----------------------------------------------------------------------===//

mlir/test/lib/Dialect/Test/TestAttributes.h

@@ -20,10 +20,11 @@
 #include "mlir/Dialect/Ptr/IR/MemorySpaceInterfaces.h"
 #include "mlir/Dialect/Utils/StructuredOpsUtils.h"
 #include "mlir/IR/Attributes.h"
-#include "mlir/IR/Diagnostics.h"
+#include "mlir/IR/BuiltinAttributes.h"
 #include "mlir/IR/Dialect.h"
-#include "mlir/IR/DialectImplementation.h"
 #include "mlir/IR/DialectResourceBlobManager.h"
+#include "mlir/IR/OpImplementation.h"
+#include "mlir/IR/SymbolTable.h"
 #include "mlir/IR/TensorEncoding.h"
 
 // generated files require above includes to come first