Module: MilkTea::LowererFunctions

Included in:
Lowerer
Defined in:
lib/milk_tea/core/lowering/functions.rb

Instance Method Summary collapse

Instance Method Details

#lower_async_function_decl(binding, receiver_type: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/functions.rb', line 177

def lower_async_function_decl(binding, receiver_type: nil)
  decl = binding.ast
  normalized_statements = normalize_async_body(binding, decl.body)
  constructor_linkage_name = function_binding_c_name(binding, module_name: @ctx.module_name, receiver_type:)
  frame_linkage_name = "#{constructor_linkage_name}__frame"
  resume_linkage_name = "#{constructor_linkage_name}__resume"
  ready_linkage_name = "#{constructor_linkage_name}__ready"
  set_waiter_linkage_name = "#{constructor_linkage_name}__set_waiter"
  release_linkage_name = "#{constructor_linkage_name}__release"
  take_result_linkage_name = "#{constructor_linkage_name}__take_result"
  cancel_linkage_name = "#{constructor_linkage_name}__cancel"

  async_info = analyze_async_function(binding, normalized_statements)
  frame_type = build_async_frame_type(frame_linkage_name, async_info)

  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: frame_linkage_name,
    linkage_name: frame_linkage_name,
    fields: frame_type.fields.map { |field_name, field_type| IR::Field.new(name: field_name, type: field_type) },
    packed: false,
    alignment: nil,
  )
  @artifacts.synthetic_functions << build_async_resume_function(binding, normalized_statements, frame_type, resume_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_ready_function(frame_type, ready_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_set_waiter_function(frame_type, set_waiter_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_release_function(frame_type, release_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_take_result_function(frame_type, take_result_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_cancel_function(frame_type, cancel_linkage_name, async_info)

  if root_main_entrypoint_signature(binding)
    @artifacts.synthetic_functions << build_async_constructor_function(
      binding,
      decl,
      frame_type,
      constructor_linkage_name,
      resume_linkage_name,
      ready_linkage_name,
      set_waiter_linkage_name,
      release_linkage_name,
      take_result_linkage_name,
      cancel_linkage_name,
      async_info,
    )

    return build_async_main_entrypoint(binding, constructor_linkage_name, async_info)
  end

  build_async_constructor_function(
    binding,
    decl,
    frame_type,
    constructor_linkage_name,
    resume_linkage_name,
    ready_linkage_name,
    set_waiter_linkage_name,
    release_linkage_name,
    take_result_linkage_name,
    cancel_linkage_name,
    async_info,
  )
end

#lower_function_decl(binding, receiver_type: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/functions.rb', line 110

def lower_function_decl(binding, receiver_type: nil)
  decl = binding.ast
  params = []
  env = empty_env
  parameter_setup = []
  previous_type_substitutions = @ctx.current_type_substitutions
  @ctx.current_type_substitutions = binding.type_substitutions

  return lower_async_function_decl(binding, receiver_type:) if binding.async

  receiver_by_pointer = pointer_lowered_sync_method_receiver?(binding)

  body_params = binding.body_params.dup
  if binding.type.receiver_type
    receiver_binding = body_params.shift
    linkage_name = c_local_name(receiver_binding.name)
    env[:scopes].last[receiver_binding.name] = local_binding(
      type: receiver_binding.type,
      linkage_name:,
      mutable: receiver_binding.mutable,
      pointer: receiver_by_pointer,
    )
    params << IR::Param.new(
      name: receiver_binding.name,
      linkage_name:,
      type: receiver_binding.type,
      pointer: receiver_by_pointer,
    )
  end

  body_params.each_with_index do |param_binding, index|
    type = param_binding.type

    linkage_name = c_local_name(param_binding.name)
    if array_type?(type)
      input_linkage_name = "#{linkage_name}_input"
      params << IR::Param.new(name: param_binding.name, linkage_name: input_linkage_name, type:, pointer: false)
      env[:scopes].last[param_binding.name] = local_binding(type:, linkage_name:, mutable: false, pointer: false)
      parameter_setup << IR::LocalDecl.new(
        name: param_binding.name,
        linkage_name:,
        type:,
        value: IR::Name.new(name: input_linkage_name, type:, pointer: false),
      )
    else
      env[:scopes].last[param_binding.name] = local_binding(type:, linkage_name:, mutable: false, pointer: false)
      params << IR::Param.new(name: param_binding.name, linkage_name:, type:, pointer: false)
    end
  end

  return_type = binding.type.return_type
  body = lower_block(decl.body, env:, active_defers: [], return_type:, loop_flow: nil, allow_return: true)
  body = parameter_setup + body

  IR::Function.new(
    name: decl.name,
    linkage_name: function_binding_c_name(binding, module_name: @ctx.module_name, receiver_type:),
    params:,
    return_type:,
    body:,
    entry_point: false,
    method_receiver_param: !binding.type.receiver_type.nil?,
  )
ensure
  @ctx.current_type_substitutions = previous_type_substitutions
end

#lower_functions ⇒ Object 



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# File 'lib/milk_tea/core/lowering/functions.rb', line 5

def lower_functions
  lowered = []

  changed = true
  while changed
    changed = false

    expanded_declarations.each do |decl|
      case decl
      when AST::FunctionDef
        binding = @ctx.functions.fetch(decl.name)
        next if binding.body_return_type == Types::BUILTIN_TYPE_META_TYPE
        if binding.type_params.any?
          binding.instances.values.sort_by { |instance| instance.type_arguments.map(&:to_s).join(",") }.each do |instance|
            linkage_name = function_binding_c_name(instance, module_name: @ctx.module_name)
            next if @artifacts.lowered_function_linkage_names[linkage_name]

            lowered << lower_function_decl(instance)
            @artifacts.lowered_function_linkage_names[linkage_name] = true
            changed = true
          end
        else
          linkage_name = function_binding_c_name(binding, module_name: @ctx.module_name)
          next if @artifacts.lowered_function_linkage_names[linkage_name]

          lowered << lower_function_decl(binding)
          @artifacts.lowered_function_linkage_names[linkage_name] = true
          if @ctx.module_name.to_s == @program.root_analysis.module_name.to_s
            if (entrypoint = build_root_main_entrypoint(binding))
              next if @artifacts.lowered_function_linkage_names[entrypoint.linkage_name]

              lowered << entrypoint
              @artifacts.lowered_function_linkage_names[entrypoint.linkage_name] = true
            end
          end
          changed = true
        end
      when AST::ExtendingBlock
        receiver_type = resolve_extending_receiver_type(@ctx.analysis, decl.type_name)
        methods_hash = @ctx.methods[receiver_type]
        unless methods_hash
          methods_hash = @ctx.methods.find { |k, _| k.to_s == receiver_type.to_s }&.last
        end
        next unless methods_hash
        decl.methods.each do |method|
          binding = methods_hash[method.kind == :static ? "static:#{method.name}" : method.name]
          next unless binding
          if binding.type_params.any?
            binding.instances.values.sort_by { |instance| instance.type_arguments.map(&:to_s).join(",") }.each do |instance|
              linkage_name = function_binding_c_name(instance, module_name: @ctx.module_name, receiver_type:)
              next if @artifacts.lowered_function_linkage_names[linkage_name]

              lowered << lower_function_decl(instance, receiver_type:)
              @artifacts.lowered_function_linkage_names[linkage_name] = true
              changed = true
            end
          else
            linkage_name = function_binding_c_name(binding, module_name: @ctx.module_name, receiver_type:)
            next if @artifacts.lowered_function_linkage_names[linkage_name]

            lowered << lower_function_decl(binding, receiver_type:)
            @artifacts.lowered_function_linkage_names[linkage_name] = true
            changed = true
          end
        end
      end
    end
  end

  lowered
end

#resolve_extending_receiver_type(analysis, type_name) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/functions.rb', line 77

def resolve_extending_receiver_type(analysis, type_name)
  if type_name.is_a?(AST::TypeRef)
    generic_type = resolve_named_generic_type_for_analysis(analysis, type_name.name.parts)
    if generic_type.is_a?(Types::GenericStructDefinition) || generic_type.is_a?(Types::GenericVariantDefinition)
      validate_methods_receiver_type_arguments!(type_name, generic_type)
      return generic_type
    end

    begin
      return method_dispatch_receiver_type(resolve_type_ref_for_analysis(type_name, analysis))
    rescue LoweringError => error
      receiver_type_param_names = methods_receiver_type_argument_names!(type_name)
      raise error if receiver_type_param_names.empty?

      receiver_type_params = receiver_type_param_names.to_h { |name| [name, Types::TypeVar.new(name)] }
      receiver_type = resolve_type_ref_for_analysis(type_name, analysis, type_params: receiver_type_params)
      return method_dispatch_receiver_type(receiver_type)
    end
  end

  parts = type_name.name.parts
  if parts.length == 1
    return types_for_module(analysis.module_name).fetch(parts.first)
  end

  if parts.length == 2
    imported_module = imports_for_module(analysis.module_name).fetch(parts.first)
    return imported_module.types.fetch(parts.last)
  end

  raise LoweringError.new("unsupported extending target #{type_name}", line: 0, column: 0, path: @ctx.current_analysis_path)
end