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A.2.6 Function declarations</div>
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function_data_type ::= data_type | void </p>
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function_data_type_or_implicit ::= </p>
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function_data_type </p>
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| [ signing ] { packed_dimension } </p>
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function_declaration ::= function [ lifetime ] function_body_declaration </p>
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function_body_declaration ::= </p>
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function_data_type_or_implicit </p>
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[ interface_identifier . | class_scope ] function_identifier ; </p>
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{ tf_item_declaration } </p>
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{ function_statement_or_null } </p>
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endfunction [ : function_identifier ] </p>
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| function_data_type_or_implicit </p>
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[ interface_identifier . | class_scope ] function_identifier ( [ tf_port_list ] ) ; </p>
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{ block_item_declaration } </p>
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{ function_statement_or_null } </p>
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endfunction [ : function_identifier ] </p>
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function_prototype ::= function function_data_type function_identifier ( [ tf_port_list ] ) </p>
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dpi_import_export ::= </p>
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import "DPI" [ dpi_function_import_property ] [ c_identifier = ] dpi_function_proto ; </p>
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| import "DPI" [ dpi_task_import_property ] [ c_identifier = ] dpi_task_proto ; </p>
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| export "DPI" [ c_identifier = ] function function_identifier ; </p>
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| export "DPI" [ c_identifier = ] task task_identifier ; </p>
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dpi_function_import_property ::= context | pure </p>
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dpi_task_import_property ::= context </p>
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dpi_function_proto8,9 ::= function_prototype </p>
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