Add __repr__ to core API classes and consolidate object protocol tests (#1538)

* Add __repr__ to core API classes and consolidate object protocol tests

- Add __repr__ methods to Stream, Event, Context, Buffer, ObjectCode, Kernel
- Create test_object_protocols.py with comprehensive tests for:
  - Weak references (weakref.ref, WeakValueDict, WeakKeyDict, WeakSet)
  - Hash consistency, distinctness, and small value guards
  - Equality (reflexive, cross-type, same-type distinct objects)
  - Collection usage (dict, set, weak collections)
  - repr format validation with regex patterns
- Remove test_hashable.py, test_comparable.py, test_weakref.py (consolidated)

* Update __repr__ to use angle-bracket format for consistency

Change repr format from ClassName(...) to <ClassName ...> with
space-separated attributes for Stream, Event, Context, Buffer,
ObjectCode, and Kernel. This aligns with Device's existing format.

- Stream: add context handle to repr
- Buffer: show is_mapped=True for IPC-imported buffers
- Update test patterns to match new format
- Add comments to hash distinctness tests explaining rationale

* Add test for equality of objects created via from_handle

Verify that Stream, Buffer, and Kernel objects created via from_handle
compare equal (and have equal hashes) when wrapping the same underlying
handle. This addresses the review comment about testing same-handle equality.

* Remove test_hash_not_small and explicit assert messages

Address review feedback:
- Remove test_hash_not_small (not adding much value per cpcloud/rwgk)
- Remove explicit assert messages to let pytest provide better output

* Empty commit to retrigger CI

Author: Andy-Jost

cuda_core/cuda/core/_context.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -48,6 +48,9 @@ cdef class Context:
     def __hash__(self) -> int:
         return hash(as_intptr(self._h_context))
 
+    def __repr__(self) -> str:
+        return f"<Context handle={as_intptr(self._h_context):#x} device={self._device_id}>"
+
 
 @dataclass
 class ContextOptions:

cuda_core/cuda/core/_cpp/resource_handles.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 //
 // SPDX-License-Identifier: Apache-2.0
 

cuda_core/cuda/core/_cpp/resource_handles.hpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 //
 // SPDX-License-Identifier: Apache-2.0
 

cuda_core/cuda/core/_event.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -178,6 +178,9 @@ cdef class Event:
         cdef Event _other = <Event>other
         return as_intptr(self._h_event) == as_intptr(_other._h_event)
 
+    def __repr__(self) -> str:
+        return f"<Event handle={as_intptr(self._h_event):#x}>"
+
     def get_ipc_descriptor(self) -> IPCEventDescriptor:
         """Export an event allocated for sharing between processes."""
         if self._ipc_descriptor is not None:

cuda_core/cuda/core/_launch_config.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 

cuda_core/cuda/core/_launcher.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 

cuda_core/cuda/core/_linker.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 

cuda_core/cuda/core/_memory/_buffer.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -334,6 +334,10 @@ cdef class Buffer:
     def __hash__(self) -> int:
         return hash((as_intptr(self._h_ptr), self._size))
 
+    def __repr__(self) -> str:
+        maybe_is_mapped = " is_mapped=True" if self.is_mapped else ""
+        return f"<Buffer ptr={as_intptr(self._h_ptr):#x} size={self._size}{maybe_is_mapped}>"
+
     @property
     def is_device_accessible(self) -> bool:
         """Return True if this buffer can be accessed by the GPU, otherwise False."""

cuda_core/cuda/core/_memory/_memory_pool.pxd

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 

cuda_core/cuda/core/_memory/_memory_pool.pyx

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0