class GirFFI::Builders::ArgumentBuilder
Implements building pre- and post-processing statements for arguments.
Constants
- DESTROY_NOTIFIER
Public Instance Methods
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# File lib/gir_ffi/builders/argument_builder.rb, line 22 def allow_none? arginfo.may_be_null? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 18 def block_argument? specialized_type_tag == :callback end
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# File lib/gir_ffi/builders/argument_builder.rb, line 38 def capture_variable_name nil end
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# File lib/gir_ffi/builders/argument_builder.rb, line 14 def method_argument_name name if has_input_value? && !helper_argument? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 55 def post_conversion if direction == :error ["GirFFI::ArgHelper.check_error(#{call_argument_name})"] elsif has_post_conversion? value = output_value ["#{post_converted_name} = #{value}"] else [] end end
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# File lib/gir_ffi/builders/argument_builder.rb, line 26 def post_converted_name @post_converted_name ||= if has_post_conversion? new_variable else call_argument_name end end
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# File lib/gir_ffi/builders/argument_builder.rb, line 42 def pre_conversion case direction when :in pre_conversion_in when :inout pre_conversion_inout when :out pre_conversion_out when :error pre_conversion_error end end
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# File lib/gir_ffi/builders/argument_builder.rb, line 34 def return_value_name post_converted_name if has_output_value? && !array_length_parameter? end
Private Instance Methods
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# File lib/gir_ffi/builders/argument_builder.rb, line 140 def allocated_by_them? !arginfo.caller_allocates? && type_info.pointer? end
Check if an out argument needs to be allocated by them, the callee. Since caller_allocates is false by default, we must also check that the type is a pointer. For example, an out parameter of type gint8* will always be allocated by the caller (that’s us).
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# File lib/gir_ffi/builders/argument_builder.rb, line 178 def array_length_assignment arrname = array_arg.name "#{name} = #{arrname}.nil? ? 0 : #{arrname}.length" end
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# File lib/gir_ffi/builders/argument_builder.rb, line 235 def callback_argument_name related_callback_builder.call_argument_name end
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# File lib/gir_ffi/builders/argument_builder.rb, line 201 def caller_allocated_object? [:struct, :array].include?(specialized_type_tag) && arginfo.caller_allocates? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 152 def fixed_array_size_check size = type_info.array_fixed_size "GirFFI::ArgHelper.check_fixed_array_size #{size}, #{name}, \"#{name}\"" end
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# File lib/gir_ffi/builders/argument_builder.rb, line 132 def gvalue? type_info.gvalue? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 174 def has_ingoing_component? [:inout, :in].include?(direction) end
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# File lib/gir_ffi/builders/argument_builder.rb, line 170 def has_input_value? has_ingoing_component? && !skipped_in? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 166 def has_output_value? [:inout, :out].include?(direction) && !skipped_out? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 98 def has_post_conversion? has_output_value? && (!caller_allocated_object? || gvalue?) end
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# File lib/gir_ffi/builders/argument_builder.rb, line 208 def ingoing_convertor if skipped_in? NullConvertor.new("0") elsif destroy_notifier? NullConvertor.new(DESTROY_NOTIFIER) elsif user_data? ClosureToPointerConvertor.new(callback_argument_name) elsif needs_ruby_to_c_conversion? RubyToCConvertor.new(type_info, pre_convertor_argument, ownership_transfer: ownership_transfer) else NullConvertor.new(pre_convertor_argument) end end
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# File lib/gir_ffi/builders/argument_builder.rb, line 93 def ingoing_value_storage PointerValueConvertor.new(type_spec) .value_to_pointer(call_argument_name, ingoing_convertor.conversion) end
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# File lib/gir_ffi/builders/argument_builder.rb, line 144 def length_argument_name length_arg&.post_converted_name end
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# File lib/gir_ffi/builders/argument_builder.rb, line 128 def needs_out_conversion? type_info.needs_c_to_ruby_conversion_for_functions? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 231 def needs_ruby_to_c_conversion? type_info.needs_ruby_to_c_conversion_for_functions? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 148 def needs_size_check? specialized_type_tag == :c && type_info.array_fixed_size > -1 end
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# File lib/gir_ffi/builders/argument_builder.rb, line 183 def out_parameter_preparation value = if caller_allocated_object? if specialized_type_tag == :array "#{argument_class_name}.new #{type_info.element_type.inspect}" else "#{argument_class_name}.new" end else ffi_type_spec = TypeMap.type_specification_to_ffi_type type_spec "FFI::MemoryPointer.new #{ffi_type_spec.inspect}" end "#{call_argument_name} = #{value}" end
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# File lib/gir_ffi/builders/argument_builder.rb, line 115 def outgoing_convertor(base) FullCToRubyConvertor.new(type_info, base, length_argument_name, ownership_transfer: arginfo.ownership_transfer) end
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# File lib/gir_ffi/builders/argument_builder.rb, line 102 def output_value return "#{call_argument_name}.get_value" if caller_allocated_object? && gvalue? base = pointer_to_value_method_call call_argument_name, type_spec if needs_out_conversion? outgoing_convertor(base).conversion elsif allocated_by_them? && specialized_type_tag != :void pointer_to_value_method_call base, sub_type_spec else base end end
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# File lib/gir_ffi/builders/argument_builder.rb, line 124 def pointer_to_value_method_call(ptr_exp, spec) PointerValueConvertor.new(spec).pointer_to_value(ptr_exp) end
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# File lib/gir_ffi/builders/argument_builder.rb, line 89 def pre_conversion_error ["#{call_argument_name} = FFI::MemoryPointer.new(:pointer).write_pointer nil"] end
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# File lib/gir_ffi/builders/argument_builder.rb, line 68 def pre_conversion_in pr = [] pr << fixed_array_size_check if needs_size_check? pr << array_length_assignment if array_length_parameter? pr << "#{call_argument_name} = #{ingoing_convertor.conversion}" pr end
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# File lib/gir_ffi/builders/argument_builder.rb, line 76 def pre_conversion_inout pr = [] pr << fixed_array_size_check if needs_size_check? pr << array_length_assignment if array_length_parameter? pr << out_parameter_preparation pr << ingoing_value_storage pr end
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# File lib/gir_ffi/builders/argument_builder.rb, line 85 def pre_conversion_out [out_parameter_preparation] end
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# File lib/gir_ffi/builders/argument_builder.rb, line 223 def pre_convertor_argument if ownership_transfer == :everything && specialized_type_tag == :object "#{name} && #{name}.ref" else name end end
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# File lib/gir_ffi/builders/argument_builder.rb, line 157 def skipped_in? arginfo.skip? end
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# File lib/gir_ffi/builders/argument_builder.rb, line 161 def skipped_out? arginfo.skip? || array_arg && array_arg.specialized_type_tag == :strv end
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# File lib/gir_ffi/builders/argument_builder.rb, line 120 def sub_type_spec type_spec[1] end
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# File lib/gir_ffi/builders/argument_builder.rb, line 197 def type_spec type_info.tag_or_class end