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utils: ipc: Do not define variables in signal handler up front

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Defining the variables at the beginning of the function forces the types
to be default constructible, which may not be desirable; furthermore, it
also forces the move/copy assignment operator to be used when the
deserialized value is retrieved.

Having `T val = f()` has the advantage of benefitting from potential RVO
as well as not requiring `T` to be default constructible, so generate
code in that form by calling `deserialize_call()` with `declare=true`.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Barnabás Pőcze 2025-03-26 09:37:08 +01:00
parent f31da7272e
commit e1818265ae
1 changed files with 1 additions and 4 deletions
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5
utils/codegen/ipc/generators/libcamera_templates/module_ipa_proxy.cpp.tmpl
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@ -239,10 +239,7 @@ void {{proxy_name}}::{{method.mojom_name}}IPC(
[[maybe_unused]] size_t dataSize,
[[maybe_unused]] const std::vector<SharedFD> &fds)
{
{%- for param in method.parameters %}
{{param|name}} {{param.mojom_name}};
{%- endfor %}
{{proxy_funcs.deserialize_call(method.parameters, 'data', 'fds', false, false, true, 'dataSize')}}
{{proxy_funcs.deserialize_call(method.parameters, 'data', 'fds', false, true, true, 'dataSize')}}
{{method.mojom_name}}.emit({{method.parameters|params_comma_sep}});
}
{% endfor %}