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[api] Make generated encode and size entry points type erased

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Every message sent through send_message or the entity paths needed a
proto_encode_msg<T> thunk (17 bytes on xtensa) and, for entity state
and info messages, a calc_size<T> thunk, because the generated encode
and calculate_size were member functions and the connection code wants
plain function pointers over const void *.

The generator now emits the bodies as static encode_msg(const void *)
and calc_size_msg(const void *) functions, so &T::encode_msg is
already a MessageEncodeFn and the thunks disappear. The member
encode() and calculate_size() remain as inline forwarders for direct
callers. ProtoMessage carries the same static defaults for messages
without fields, which also removes the separate no-op encode thunk.
This commit is contained in:
J. Nick Koston
2026-09-07 15:57:12 +02:00
parent c4e1360cdf
commit 1b070629bc
6 changed files with 2163 additions and 1551 deletions
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tests/unit_tests/components/api/test_api_proto.py
+7 -7
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@@ -194,17 +194,17 @@ def test_superseded_device_info_fields_still_declared_in_header() -> None:
def test_superseded_device_info_fields_still_encoded_and_sized() -> None:
"""Each superseded field must still be touched by DeviceInfoResponse's
generated encode() and calculate_size(), i.e. it is still put on the wire.
generated encode_msg() and calc_size_msg(), i.e. it is still put on the wire.
"""
encode_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::encode")
size_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::calculate_size")
encode_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::encode_msg")
size_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::calc_size_msg")
for field_name in SUPERSEDED_FIELDS:
assert f"this->{field_name}" in encode_body, (
f"DeviceInfoResponse::encode() no longer references {field_name}. "
assert f"msg.{field_name}" in encode_body, (
f"DeviceInfoResponse::encode_msg() no longer references {field_name}. "
f"{DEPRECATED_FIELD_TRAP}"
)
assert f"this->{field_name}" in size_body, (
f"DeviceInfoResponse::calculate_size() no longer references "
assert f"msg.{field_name}" in size_body, (
f"DeviceInfoResponse::calc_size_msg() no longer references "
f"{field_name}. {DEPRECATED_FIELD_TRAP}"
)