[Mlir-commits] [mlir] [mlir][Pass] Fix crash when applying a pass to an optional interface (PR #168499)

[Matthias Springer]

https://github.com/matthias-springer updated https://github.com/llvm/llvm-project/pull/168499

>From 719c41abf08c385eb85857e26754ae3ef0c94490 Mon Sep 17 00:00:00 2001
From: Matthias Springer <me at m-sp.org>
Date: Tue, 18 Nov 2025 08:17:03 +0000
Subject: [PATCH] [mlir][Pass] Fix crash when applying a pass to an optional
 interface

---
 mlir/include/mlir/Pass/Pass.h                 |  8 +++++
 mlir/lib/Pass/Pass.cpp                        |  6 ++--
 .../Transform/test-pass-application.mlir      | 34 ++++++++++++++++++-
 mlir/test/Pass/pipeline-invalid.mlir          |  2 +-
 4 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/mlir/include/mlir/Pass/Pass.h b/mlir/include/mlir/Pass/Pass.h
index 16893c6db87b1..448a688243491 100644
--- a/mlir/include/mlir/Pass/Pass.h
+++ b/mlir/include/mlir/Pass/Pass.h
@@ -193,6 +193,13 @@ class Pass {
   /// This is useful for generic operation passes to add restrictions on the
   /// operations they operate on.
   virtual bool canScheduleOn(RegisteredOperationName opName) const = 0;
+  virtual bool canScheduleOn(Operation *op) const {
+    std::optional<RegisteredOperationName> registeredInfo =
+        op->getName().getRegisteredInfo();
+    if (!registeredInfo)
+      return false;
+    return canScheduleOn(*registeredInfo);
+  }
 
   /// Schedule an arbitrary pass pipeline on the provided operation.
   /// This can be invoke any time in a pass to dynamic schedule more passes.
@@ -436,6 +443,7 @@ class InterfacePass : public OperationPass<> {
   /// Indicate if the current pass can be scheduled on the given operation type.
   /// For an InterfacePass, this checks if the operation implements the given
   /// interface.
+  bool canScheduleOn(Operation *op) const final { return isa<InterfaceT>(op); }
   bool canScheduleOn(RegisteredOperationName opName) const final {
     return opName.hasInterface<InterfaceT>();
   }
diff --git a/mlir/lib/Pass/Pass.cpp b/mlir/lib/Pass/Pass.cpp
index 521c7c6be17b6..75f882606e0ab 100644
--- a/mlir/lib/Pass/Pass.cpp
+++ b/mlir/lib/Pass/Pass.cpp
@@ -559,9 +559,9 @@ LogicalResult OpToOpPassAdaptor::run(Pass *pass, Operation *op,
     return op->emitOpError() << "trying to schedule a pass on an operation not "
                                 "marked as 'IsolatedFromAbove'";
   }
-  if (!pass->canScheduleOn(*op->getName().getRegisteredInfo())) {
-    return op->emitOpError()
-           << "trying to schedule a pass on an unsupported operation";
+  if (!pass->canScheduleOn(op)) {
+    return op->emitOpError() << "trying to schedule pass '" << pass->getName()
+                             << "' on an unsupported operation";
   }
 
   // Initialize the pass state with a callback for the pass to dynamically
diff --git a/mlir/test/Dialect/Transform/test-pass-application.mlir b/mlir/test/Dialect/Transform/test-pass-application.mlir
index ce8f69c58701d..0d74f5dee73a5 100644
--- a/mlir/test/Dialect/Transform/test-pass-application.mlir
+++ b/mlir/test/Dialect/Transform/test-pass-application.mlir
@@ -386,7 +386,7 @@ module attributes {transform.with_named_sequence} {
 // -----
 
 module attributes {transform.with_named_sequence} {
-  // expected-error @below {{trying to schedule a pass on an unsupported operation}}
+  // expected-error @below {{trying to schedule pass 'DuplicateFunctionEliminationPass' on an unsupported operation}}
   // expected-note @below {{target op}}
   func.func @invalid_target_op_type() {
     return
@@ -475,3 +475,35 @@ module attributes {transform.with_named_sequence} {
     "transform.yield"() : () -> ()
   }) : () -> ()
 }) {transform.with_named_sequence} : () -> ()
+
+// -----
+
+module attributes {transform.with_named_sequence} {
+  // Unnamed modules do not implement SymbolOpInterface, so test-print-liveness
+  // cannot be applied.
+  // expected-error @+2 {{trying to schedule pass '(anonymous namespace)::TestLivenessPass' on an unsupported operation}}
+  // expected-note @+1 {{target op}}
+  builtin.module attributes{test.target} {}
+
+  transform.named_sequence @__transform_main(%arg1: !transform.any_op) {
+    %1 = transform.structured.match ops{["builtin.module"]} attributes {test.target} in %arg1 : (!transform.any_op) -> !transform.any_op
+
+    // expected-error @below {{pass pipeline failed}}
+    transform.apply_registered_pass "test-print-liveness" to %1 : (!transform.any_op) -> !transform.any_op
+    transform.yield
+  }
+}
+
+// -----
+
+module attributes {transform.with_named_sequence} {
+  // Named modules implement SymbolOpInterface, so test-print-liveness can be
+  // applied.
+  builtin.module @named_module attributes{test.target} {}
+
+  transform.named_sequence @__transform_main(%arg1: !transform.any_op) {
+    %1 = transform.structured.match ops{["builtin.module"]} attributes {test.target} in %arg1 : (!transform.any_op) -> !transform.any_op
+    transform.apply_registered_pass "test-print-liveness" to %1 : (!transform.any_op) -> !transform.any_op
+    transform.yield
+  }
+}
diff --git a/mlir/test/Pass/pipeline-invalid.mlir b/mlir/test/Pass/pipeline-invalid.mlir
index 948a13384bc75..4116e127a24a6 100644
--- a/mlir/test/Pass/pipeline-invalid.mlir
+++ b/mlir/test/Pass/pipeline-invalid.mlir
@@ -15,5 +15,5 @@ arith.constant 0
 
 // -----
 
-// expected-error at below {{trying to schedule a pass on an unsupported operation}}
+// expected-error at below {{trying to schedule pass '(anonymous namespace)::TestFunctionPass' on an unsupported operation}}
 module {}